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Commit | Line | Data |
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f46b5a66 CH |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/bio.h> | |
21 | #include <linux/buffer_head.h> | |
22 | #include <linux/file.h> | |
23 | #include <linux/fs.h> | |
cb8e7090 | 24 | #include <linux/fsnotify.h> |
f46b5a66 CH |
25 | #include <linux/pagemap.h> |
26 | #include <linux/highmem.h> | |
27 | #include <linux/time.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/string.h> | |
f46b5a66 | 30 | #include <linux/backing-dev.h> |
cb8e7090 | 31 | #include <linux/mount.h> |
f46b5a66 | 32 | #include <linux/mpage.h> |
cb8e7090 | 33 | #include <linux/namei.h> |
f46b5a66 CH |
34 | #include <linux/swap.h> |
35 | #include <linux/writeback.h> | |
f46b5a66 CH |
36 | #include <linux/compat.h> |
37 | #include <linux/bit_spinlock.h> | |
cb8e7090 | 38 | #include <linux/security.h> |
f46b5a66 | 39 | #include <linux/xattr.h> |
f54de068 | 40 | #include <linux/mm.h> |
5a0e3ad6 | 41 | #include <linux/slab.h> |
f7039b1d | 42 | #include <linux/blkdev.h> |
8ea05e3a | 43 | #include <linux/uuid.h> |
55e301fd | 44 | #include <linux/btrfs.h> |
416161db | 45 | #include <linux/uaccess.h> |
f46b5a66 CH |
46 | #include "ctree.h" |
47 | #include "disk-io.h" | |
48 | #include "transaction.h" | |
49 | #include "btrfs_inode.h" | |
f46b5a66 CH |
50 | #include "print-tree.h" |
51 | #include "volumes.h" | |
925baedd | 52 | #include "locking.h" |
581bb050 | 53 | #include "inode-map.h" |
d7728c96 | 54 | #include "backref.h" |
606686ee | 55 | #include "rcu-string.h" |
31db9f7c | 56 | #include "send.h" |
3f6bcfbd | 57 | #include "dev-replace.h" |
63541927 | 58 | #include "props.h" |
3b02a68a | 59 | #include "sysfs.h" |
fcebe456 | 60 | #include "qgroup.h" |
1ec9a1ae | 61 | #include "tree-log.h" |
ebb8765b | 62 | #include "compression.h" |
f46b5a66 | 63 | |
abccd00f HM |
64 | #ifdef CONFIG_64BIT |
65 | /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI | |
66 | * structures are incorrect, as the timespec structure from userspace | |
67 | * is 4 bytes too small. We define these alternatives here to teach | |
68 | * the kernel about the 32-bit struct packing. | |
69 | */ | |
70 | struct btrfs_ioctl_timespec_32 { | |
71 | __u64 sec; | |
72 | __u32 nsec; | |
73 | } __attribute__ ((__packed__)); | |
74 | ||
75 | struct btrfs_ioctl_received_subvol_args_32 { | |
76 | char uuid[BTRFS_UUID_SIZE]; /* in */ | |
77 | __u64 stransid; /* in */ | |
78 | __u64 rtransid; /* out */ | |
79 | struct btrfs_ioctl_timespec_32 stime; /* in */ | |
80 | struct btrfs_ioctl_timespec_32 rtime; /* out */ | |
81 | __u64 flags; /* in */ | |
82 | __u64 reserved[16]; /* in */ | |
83 | } __attribute__ ((__packed__)); | |
84 | ||
85 | #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ | |
86 | struct btrfs_ioctl_received_subvol_args_32) | |
87 | #endif | |
88 | ||
89 | ||
416161db | 90 | static int btrfs_clone(struct inode *src, struct inode *inode, |
1c919a5e MF |
91 | u64 off, u64 olen, u64 olen_aligned, u64 destoff, |
92 | int no_time_update); | |
416161db | 93 | |
6cbff00f CH |
94 | /* Mask out flags that are inappropriate for the given type of inode. */ |
95 | static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) | |
96 | { | |
97 | if (S_ISDIR(mode)) | |
98 | return flags; | |
99 | else if (S_ISREG(mode)) | |
100 | return flags & ~FS_DIRSYNC_FL; | |
101 | else | |
102 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); | |
103 | } | |
104 | ||
105 | /* | |
106 | * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. | |
107 | */ | |
108 | static unsigned int btrfs_flags_to_ioctl(unsigned int flags) | |
109 | { | |
110 | unsigned int iflags = 0; | |
111 | ||
112 | if (flags & BTRFS_INODE_SYNC) | |
113 | iflags |= FS_SYNC_FL; | |
114 | if (flags & BTRFS_INODE_IMMUTABLE) | |
115 | iflags |= FS_IMMUTABLE_FL; | |
116 | if (flags & BTRFS_INODE_APPEND) | |
117 | iflags |= FS_APPEND_FL; | |
118 | if (flags & BTRFS_INODE_NODUMP) | |
119 | iflags |= FS_NODUMP_FL; | |
120 | if (flags & BTRFS_INODE_NOATIME) | |
121 | iflags |= FS_NOATIME_FL; | |
122 | if (flags & BTRFS_INODE_DIRSYNC) | |
123 | iflags |= FS_DIRSYNC_FL; | |
d0092bdd LZ |
124 | if (flags & BTRFS_INODE_NODATACOW) |
125 | iflags |= FS_NOCOW_FL; | |
126 | ||
13f48dc9 | 127 | if (flags & BTRFS_INODE_NOCOMPRESS) |
d0092bdd | 128 | iflags |= FS_NOCOMP_FL; |
13f48dc9 ST |
129 | else if (flags & BTRFS_INODE_COMPRESS) |
130 | iflags |= FS_COMPR_FL; | |
6cbff00f CH |
131 | |
132 | return iflags; | |
133 | } | |
134 | ||
135 | /* | |
136 | * Update inode->i_flags based on the btrfs internal flags. | |
137 | */ | |
138 | void btrfs_update_iflags(struct inode *inode) | |
139 | { | |
140 | struct btrfs_inode *ip = BTRFS_I(inode); | |
3cc79392 | 141 | unsigned int new_fl = 0; |
6cbff00f CH |
142 | |
143 | if (ip->flags & BTRFS_INODE_SYNC) | |
3cc79392 | 144 | new_fl |= S_SYNC; |
6cbff00f | 145 | if (ip->flags & BTRFS_INODE_IMMUTABLE) |
3cc79392 | 146 | new_fl |= S_IMMUTABLE; |
6cbff00f | 147 | if (ip->flags & BTRFS_INODE_APPEND) |
3cc79392 | 148 | new_fl |= S_APPEND; |
6cbff00f | 149 | if (ip->flags & BTRFS_INODE_NOATIME) |
3cc79392 | 150 | new_fl |= S_NOATIME; |
6cbff00f | 151 | if (ip->flags & BTRFS_INODE_DIRSYNC) |
3cc79392 FM |
152 | new_fl |= S_DIRSYNC; |
153 | ||
154 | set_mask_bits(&inode->i_flags, | |
155 | S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC, | |
156 | new_fl); | |
6cbff00f CH |
157 | } |
158 | ||
6cbff00f CH |
159 | static int btrfs_ioctl_getflags(struct file *file, void __user *arg) |
160 | { | |
496ad9aa | 161 | struct btrfs_inode *ip = BTRFS_I(file_inode(file)); |
6cbff00f CH |
162 | unsigned int flags = btrfs_flags_to_ioctl(ip->flags); |
163 | ||
164 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
165 | return -EFAULT; | |
166 | return 0; | |
167 | } | |
168 | ||
75e7cb7f LB |
169 | static int check_flags(unsigned int flags) |
170 | { | |
171 | if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ | |
172 | FS_NOATIME_FL | FS_NODUMP_FL | \ | |
173 | FS_SYNC_FL | FS_DIRSYNC_FL | \ | |
e1e8fb6a LZ |
174 | FS_NOCOMP_FL | FS_COMPR_FL | |
175 | FS_NOCOW_FL)) | |
75e7cb7f LB |
176 | return -EOPNOTSUPP; |
177 | ||
178 | if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) | |
179 | return -EINVAL; | |
180 | ||
75e7cb7f LB |
181 | return 0; |
182 | } | |
183 | ||
6cbff00f CH |
184 | static int btrfs_ioctl_setflags(struct file *file, void __user *arg) |
185 | { | |
496ad9aa | 186 | struct inode *inode = file_inode(file); |
0b246afa | 187 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
6cbff00f CH |
188 | struct btrfs_inode *ip = BTRFS_I(inode); |
189 | struct btrfs_root *root = ip->root; | |
190 | struct btrfs_trans_handle *trans; | |
191 | unsigned int flags, oldflags; | |
192 | int ret; | |
f062abf0 LZ |
193 | u64 ip_oldflags; |
194 | unsigned int i_oldflags; | |
7e97b8da | 195 | umode_t mode; |
6cbff00f | 196 | |
bd60ea0f DS |
197 | if (!inode_owner_or_capable(inode)) |
198 | return -EPERM; | |
199 | ||
b83cc969 LZ |
200 | if (btrfs_root_readonly(root)) |
201 | return -EROFS; | |
202 | ||
6cbff00f CH |
203 | if (copy_from_user(&flags, arg, sizeof(flags))) |
204 | return -EFAULT; | |
205 | ||
75e7cb7f LB |
206 | ret = check_flags(flags); |
207 | if (ret) | |
208 | return ret; | |
f46b5a66 | 209 | |
e7848683 JK |
210 | ret = mnt_want_write_file(file); |
211 | if (ret) | |
212 | return ret; | |
213 | ||
5955102c | 214 | inode_lock(inode); |
6cbff00f | 215 | |
f062abf0 LZ |
216 | ip_oldflags = ip->flags; |
217 | i_oldflags = inode->i_flags; | |
7e97b8da | 218 | mode = inode->i_mode; |
f062abf0 | 219 | |
6cbff00f CH |
220 | flags = btrfs_mask_flags(inode->i_mode, flags); |
221 | oldflags = btrfs_flags_to_ioctl(ip->flags); | |
222 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { | |
223 | if (!capable(CAP_LINUX_IMMUTABLE)) { | |
224 | ret = -EPERM; | |
225 | goto out_unlock; | |
226 | } | |
227 | } | |
228 | ||
6cbff00f CH |
229 | if (flags & FS_SYNC_FL) |
230 | ip->flags |= BTRFS_INODE_SYNC; | |
231 | else | |
232 | ip->flags &= ~BTRFS_INODE_SYNC; | |
233 | if (flags & FS_IMMUTABLE_FL) | |
234 | ip->flags |= BTRFS_INODE_IMMUTABLE; | |
235 | else | |
236 | ip->flags &= ~BTRFS_INODE_IMMUTABLE; | |
237 | if (flags & FS_APPEND_FL) | |
238 | ip->flags |= BTRFS_INODE_APPEND; | |
239 | else | |
240 | ip->flags &= ~BTRFS_INODE_APPEND; | |
241 | if (flags & FS_NODUMP_FL) | |
242 | ip->flags |= BTRFS_INODE_NODUMP; | |
243 | else | |
244 | ip->flags &= ~BTRFS_INODE_NODUMP; | |
245 | if (flags & FS_NOATIME_FL) | |
246 | ip->flags |= BTRFS_INODE_NOATIME; | |
247 | else | |
248 | ip->flags &= ~BTRFS_INODE_NOATIME; | |
249 | if (flags & FS_DIRSYNC_FL) | |
250 | ip->flags |= BTRFS_INODE_DIRSYNC; | |
251 | else | |
252 | ip->flags &= ~BTRFS_INODE_DIRSYNC; | |
7e97b8da DS |
253 | if (flags & FS_NOCOW_FL) { |
254 | if (S_ISREG(mode)) { | |
255 | /* | |
256 | * It's safe to turn csums off here, no extents exist. | |
257 | * Otherwise we want the flag to reflect the real COW | |
258 | * status of the file and will not set it. | |
259 | */ | |
260 | if (inode->i_size == 0) | |
261 | ip->flags |= BTRFS_INODE_NODATACOW | |
262 | | BTRFS_INODE_NODATASUM; | |
263 | } else { | |
264 | ip->flags |= BTRFS_INODE_NODATACOW; | |
265 | } | |
266 | } else { | |
267 | /* | |
01327610 | 268 | * Revert back under same assumptions as above |
7e97b8da DS |
269 | */ |
270 | if (S_ISREG(mode)) { | |
271 | if (inode->i_size == 0) | |
272 | ip->flags &= ~(BTRFS_INODE_NODATACOW | |
273 | | BTRFS_INODE_NODATASUM); | |
274 | } else { | |
275 | ip->flags &= ~BTRFS_INODE_NODATACOW; | |
276 | } | |
277 | } | |
6cbff00f | 278 | |
75e7cb7f LB |
279 | /* |
280 | * The COMPRESS flag can only be changed by users, while the NOCOMPRESS | |
281 | * flag may be changed automatically if compression code won't make | |
282 | * things smaller. | |
283 | */ | |
284 | if (flags & FS_NOCOMP_FL) { | |
285 | ip->flags &= ~BTRFS_INODE_COMPRESS; | |
286 | ip->flags |= BTRFS_INODE_NOCOMPRESS; | |
63541927 FDBM |
287 | |
288 | ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); | |
289 | if (ret && ret != -ENODATA) | |
290 | goto out_drop; | |
75e7cb7f | 291 | } else if (flags & FS_COMPR_FL) { |
63541927 FDBM |
292 | const char *comp; |
293 | ||
75e7cb7f LB |
294 | ip->flags |= BTRFS_INODE_COMPRESS; |
295 | ip->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
63541927 | 296 | |
0b246afa | 297 | if (fs_info->compress_type == BTRFS_COMPRESS_LZO) |
63541927 | 298 | comp = "lzo"; |
5c1aab1d | 299 | else if (fs_info->compress_type == BTRFS_COMPRESS_ZLIB) |
63541927 | 300 | comp = "zlib"; |
5c1aab1d NT |
301 | else |
302 | comp = "zstd"; | |
63541927 FDBM |
303 | ret = btrfs_set_prop(inode, "btrfs.compression", |
304 | comp, strlen(comp), 0); | |
305 | if (ret) | |
306 | goto out_drop; | |
307 | ||
ebcb904d | 308 | } else { |
78a017a2 FM |
309 | ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); |
310 | if (ret && ret != -ENODATA) | |
311 | goto out_drop; | |
ebcb904d | 312 | ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); |
75e7cb7f | 313 | } |
6cbff00f | 314 | |
4da6f1a3 | 315 | trans = btrfs_start_transaction(root, 1); |
f062abf0 LZ |
316 | if (IS_ERR(trans)) { |
317 | ret = PTR_ERR(trans); | |
318 | goto out_drop; | |
319 | } | |
6cbff00f | 320 | |
306424cc | 321 | btrfs_update_iflags(inode); |
0c4d2d95 | 322 | inode_inc_iversion(inode); |
c2050a45 | 323 | inode->i_ctime = current_time(inode); |
6cbff00f | 324 | ret = btrfs_update_inode(trans, root, inode); |
6cbff00f | 325 | |
3a45bb20 | 326 | btrfs_end_transaction(trans); |
f062abf0 LZ |
327 | out_drop: |
328 | if (ret) { | |
329 | ip->flags = ip_oldflags; | |
330 | inode->i_flags = i_oldflags; | |
331 | } | |
6cbff00f | 332 | |
6cbff00f | 333 | out_unlock: |
5955102c | 334 | inode_unlock(inode); |
e7848683 | 335 | mnt_drop_write_file(file); |
2d4e6f6a | 336 | return ret; |
6cbff00f CH |
337 | } |
338 | ||
339 | static int btrfs_ioctl_getversion(struct file *file, int __user *arg) | |
340 | { | |
496ad9aa | 341 | struct inode *inode = file_inode(file); |
6cbff00f CH |
342 | |
343 | return put_user(inode->i_generation, arg); | |
344 | } | |
f46b5a66 | 345 | |
f7039b1d LD |
346 | static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) |
347 | { | |
0b246afa JM |
348 | struct inode *inode = file_inode(file); |
349 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
f7039b1d LD |
350 | struct btrfs_device *device; |
351 | struct request_queue *q; | |
352 | struct fstrim_range range; | |
353 | u64 minlen = ULLONG_MAX; | |
354 | u64 num_devices = 0; | |
815745cf | 355 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
f7039b1d LD |
356 | int ret; |
357 | ||
358 | if (!capable(CAP_SYS_ADMIN)) | |
359 | return -EPERM; | |
360 | ||
1f78160c XG |
361 | rcu_read_lock(); |
362 | list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, | |
363 | dev_list) { | |
f7039b1d LD |
364 | if (!device->bdev) |
365 | continue; | |
366 | q = bdev_get_queue(device->bdev); | |
367 | if (blk_queue_discard(q)) { | |
368 | num_devices++; | |
50d0446e | 369 | minlen = min_t(u64, q->limits.discard_granularity, |
f7039b1d LD |
370 | minlen); |
371 | } | |
372 | } | |
1f78160c | 373 | rcu_read_unlock(); |
f4c697e6 | 374 | |
f7039b1d LD |
375 | if (!num_devices) |
376 | return -EOPNOTSUPP; | |
f7039b1d LD |
377 | if (copy_from_user(&range, arg, sizeof(range))) |
378 | return -EFAULT; | |
e515c18b LC |
379 | if (range.start > total_bytes || |
380 | range.len < fs_info->sb->s_blocksize) | |
f4c697e6 | 381 | return -EINVAL; |
f7039b1d | 382 | |
f4c697e6 | 383 | range.len = min(range.len, total_bytes - range.start); |
f7039b1d | 384 | range.minlen = max(range.minlen, minlen); |
2ff7e61e | 385 | ret = btrfs_trim_fs(fs_info, &range); |
f7039b1d LD |
386 | if (ret < 0) |
387 | return ret; | |
388 | ||
389 | if (copy_to_user(arg, &range, sizeof(range))) | |
390 | return -EFAULT; | |
391 | ||
392 | return 0; | |
393 | } | |
394 | ||
dd5f9615 SB |
395 | int btrfs_is_empty_uuid(u8 *uuid) |
396 | { | |
46e0f66a CM |
397 | int i; |
398 | ||
399 | for (i = 0; i < BTRFS_UUID_SIZE; i++) { | |
400 | if (uuid[i]) | |
401 | return 0; | |
402 | } | |
403 | return 1; | |
dd5f9615 SB |
404 | } |
405 | ||
d5c12070 | 406 | static noinline int create_subvol(struct inode *dir, |
cb8e7090 | 407 | struct dentry *dentry, |
52f75f4f | 408 | const char *name, int namelen, |
6f72c7e2 | 409 | u64 *async_transid, |
8696c533 | 410 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 | 411 | { |
0b246afa | 412 | struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); |
f46b5a66 CH |
413 | struct btrfs_trans_handle *trans; |
414 | struct btrfs_key key; | |
49a3c4d9 | 415 | struct btrfs_root_item *root_item; |
f46b5a66 CH |
416 | struct btrfs_inode_item *inode_item; |
417 | struct extent_buffer *leaf; | |
d5c12070 | 418 | struct btrfs_root *root = BTRFS_I(dir)->root; |
76dda93c | 419 | struct btrfs_root *new_root; |
d5c12070 | 420 | struct btrfs_block_rsv block_rsv; |
c2050a45 | 421 | struct timespec cur_time = current_time(dir); |
5662344b | 422 | struct inode *inode; |
f46b5a66 CH |
423 | int ret; |
424 | int err; | |
425 | u64 objectid; | |
426 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
3de4586c | 427 | u64 index = 0; |
d5c12070 | 428 | u64 qgroup_reserved; |
8ea05e3a | 429 | uuid_le new_uuid; |
f46b5a66 | 430 | |
49a3c4d9 DS |
431 | root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); |
432 | if (!root_item) | |
433 | return -ENOMEM; | |
434 | ||
0b246afa | 435 | ret = btrfs_find_free_objectid(fs_info->tree_root, &objectid); |
2fbe8c8a | 436 | if (ret) |
49a3c4d9 | 437 | goto fail_free; |
6a912213 | 438 | |
e09fe2d2 QW |
439 | /* |
440 | * Don't create subvolume whose level is not zero. Or qgroup will be | |
01327610 | 441 | * screwed up since it assumes subvolume qgroup's level to be 0. |
e09fe2d2 | 442 | */ |
49a3c4d9 DS |
443 | if (btrfs_qgroup_level(objectid)) { |
444 | ret = -ENOSPC; | |
445 | goto fail_free; | |
446 | } | |
e09fe2d2 | 447 | |
d5c12070 | 448 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
9ed74f2d | 449 | /* |
d5c12070 MX |
450 | * The same as the snapshot creation, please see the comment |
451 | * of create_snapshot(). | |
9ed74f2d | 452 | */ |
d5c12070 | 453 | ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, |
dd5f9615 | 454 | 8, &qgroup_reserved, false); |
d5c12070 | 455 | if (ret) |
49a3c4d9 | 456 | goto fail_free; |
d5c12070 MX |
457 | |
458 | trans = btrfs_start_transaction(root, 0); | |
459 | if (IS_ERR(trans)) { | |
460 | ret = PTR_ERR(trans); | |
7775c818 | 461 | btrfs_subvolume_release_metadata(fs_info, &block_rsv); |
49a3c4d9 | 462 | goto fail_free; |
d5c12070 MX |
463 | } |
464 | trans->block_rsv = &block_rsv; | |
465 | trans->bytes_reserved = block_rsv.size; | |
f46b5a66 | 466 | |
0b246afa | 467 | ret = btrfs_qgroup_inherit(trans, fs_info, 0, objectid, inherit); |
6f72c7e2 AJ |
468 | if (ret) |
469 | goto fail; | |
470 | ||
4d75f8a9 | 471 | leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0); |
8e8a1e31 JB |
472 | if (IS_ERR(leaf)) { |
473 | ret = PTR_ERR(leaf); | |
474 | goto fail; | |
475 | } | |
f46b5a66 | 476 | |
b159fa28 | 477 | memzero_extent_buffer(leaf, 0, sizeof(struct btrfs_header)); |
f46b5a66 CH |
478 | btrfs_set_header_bytenr(leaf, leaf->start); |
479 | btrfs_set_header_generation(leaf, trans->transid); | |
5d4f98a2 | 480 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); |
f46b5a66 CH |
481 | btrfs_set_header_owner(leaf, objectid); |
482 | ||
0b246afa JM |
483 | write_extent_buffer_fsid(leaf, fs_info->fsid); |
484 | write_extent_buffer_chunk_tree_uuid(leaf, fs_info->chunk_tree_uuid); | |
f46b5a66 CH |
485 | btrfs_mark_buffer_dirty(leaf); |
486 | ||
49a3c4d9 | 487 | inode_item = &root_item->inode; |
3cae210f QW |
488 | btrfs_set_stack_inode_generation(inode_item, 1); |
489 | btrfs_set_stack_inode_size(inode_item, 3); | |
490 | btrfs_set_stack_inode_nlink(inode_item, 1); | |
da17066c | 491 | btrfs_set_stack_inode_nbytes(inode_item, |
0b246afa | 492 | fs_info->nodesize); |
3cae210f | 493 | btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); |
f46b5a66 | 494 | |
49a3c4d9 DS |
495 | btrfs_set_root_flags(root_item, 0); |
496 | btrfs_set_root_limit(root_item, 0); | |
3cae210f | 497 | btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); |
08fe4db1 | 498 | |
49a3c4d9 DS |
499 | btrfs_set_root_bytenr(root_item, leaf->start); |
500 | btrfs_set_root_generation(root_item, trans->transid); | |
501 | btrfs_set_root_level(root_item, 0); | |
502 | btrfs_set_root_refs(root_item, 1); | |
503 | btrfs_set_root_used(root_item, leaf->len); | |
504 | btrfs_set_root_last_snapshot(root_item, 0); | |
f46b5a66 | 505 | |
49a3c4d9 DS |
506 | btrfs_set_root_generation_v2(root_item, |
507 | btrfs_root_generation(root_item)); | |
8ea05e3a | 508 | uuid_le_gen(&new_uuid); |
49a3c4d9 DS |
509 | memcpy(root_item->uuid, new_uuid.b, BTRFS_UUID_SIZE); |
510 | btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); | |
511 | btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); | |
512 | root_item->ctime = root_item->otime; | |
513 | btrfs_set_root_ctransid(root_item, trans->transid); | |
514 | btrfs_set_root_otransid(root_item, trans->transid); | |
f46b5a66 | 515 | |
925baedd | 516 | btrfs_tree_unlock(leaf); |
f46b5a66 CH |
517 | free_extent_buffer(leaf); |
518 | leaf = NULL; | |
519 | ||
49a3c4d9 | 520 | btrfs_set_root_dirid(root_item, new_dirid); |
f46b5a66 CH |
521 | |
522 | key.objectid = objectid; | |
5d4f98a2 | 523 | key.offset = 0; |
962a298f | 524 | key.type = BTRFS_ROOT_ITEM_KEY; |
0b246afa | 525 | ret = btrfs_insert_root(trans, fs_info->tree_root, &key, |
49a3c4d9 | 526 | root_item); |
f46b5a66 CH |
527 | if (ret) |
528 | goto fail; | |
529 | ||
76dda93c | 530 | key.offset = (u64)-1; |
0b246afa | 531 | new_root = btrfs_read_fs_root_no_name(fs_info, &key); |
79787eaa | 532 | if (IS_ERR(new_root)) { |
79787eaa | 533 | ret = PTR_ERR(new_root); |
66642832 | 534 | btrfs_abort_transaction(trans, ret); |
79787eaa JM |
535 | goto fail; |
536 | } | |
76dda93c YZ |
537 | |
538 | btrfs_record_root_in_trans(trans, new_root); | |
539 | ||
63541927 | 540 | ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); |
ce598979 MF |
541 | if (ret) { |
542 | /* We potentially lose an unused inode item here */ | |
66642832 | 543 | btrfs_abort_transaction(trans, ret); |
ce598979 MF |
544 | goto fail; |
545 | } | |
546 | ||
f32e48e9 CR |
547 | mutex_lock(&new_root->objectid_mutex); |
548 | new_root->highest_objectid = new_dirid; | |
549 | mutex_unlock(&new_root->objectid_mutex); | |
550 | ||
f46b5a66 CH |
551 | /* |
552 | * insert the directory item | |
553 | */ | |
877574e2 | 554 | ret = btrfs_set_inode_index(BTRFS_I(dir), &index); |
79787eaa | 555 | if (ret) { |
66642832 | 556 | btrfs_abort_transaction(trans, ret); |
79787eaa JM |
557 | goto fail; |
558 | } | |
3de4586c CM |
559 | |
560 | ret = btrfs_insert_dir_item(trans, root, | |
8e7611cf | 561 | name, namelen, BTRFS_I(dir), &key, |
3de4586c | 562 | BTRFS_FT_DIR, index); |
79787eaa | 563 | if (ret) { |
66642832 | 564 | btrfs_abort_transaction(trans, ret); |
f46b5a66 | 565 | goto fail; |
79787eaa | 566 | } |
0660b5af | 567 | |
6ef06d27 | 568 | btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); |
52c26179 YZ |
569 | ret = btrfs_update_inode(trans, root, dir); |
570 | BUG_ON(ret); | |
571 | ||
0b246afa | 572 | ret = btrfs_add_root_ref(trans, fs_info, |
4df27c4d | 573 | objectid, root->root_key.objectid, |
4a0cc7ca | 574 | btrfs_ino(BTRFS_I(dir)), index, name, namelen); |
76dda93c | 575 | BUG_ON(ret); |
f46b5a66 | 576 | |
0b246afa | 577 | ret = btrfs_uuid_tree_add(trans, fs_info, root_item->uuid, |
6bccf3ab | 578 | BTRFS_UUID_KEY_SUBVOL, objectid); |
dd5f9615 | 579 | if (ret) |
66642832 | 580 | btrfs_abort_transaction(trans, ret); |
dd5f9615 | 581 | |
f46b5a66 | 582 | fail: |
49a3c4d9 | 583 | kfree(root_item); |
d5c12070 MX |
584 | trans->block_rsv = NULL; |
585 | trans->bytes_reserved = 0; | |
7775c818 | 586 | btrfs_subvolume_release_metadata(fs_info, &block_rsv); |
de6e8200 | 587 | |
72fd032e SW |
588 | if (async_transid) { |
589 | *async_transid = trans->transid; | |
3a45bb20 | 590 | err = btrfs_commit_transaction_async(trans, 1); |
00d71c9c | 591 | if (err) |
3a45bb20 | 592 | err = btrfs_commit_transaction(trans); |
72fd032e | 593 | } else { |
3a45bb20 | 594 | err = btrfs_commit_transaction(trans); |
72fd032e | 595 | } |
f46b5a66 CH |
596 | if (err && !ret) |
597 | ret = err; | |
1a65e24b | 598 | |
5662344b TI |
599 | if (!ret) { |
600 | inode = btrfs_lookup_dentry(dir, dentry); | |
de6e8200 LB |
601 | if (IS_ERR(inode)) |
602 | return PTR_ERR(inode); | |
5662344b TI |
603 | d_instantiate(dentry, inode); |
604 | } | |
f46b5a66 | 605 | return ret; |
49a3c4d9 DS |
606 | |
607 | fail_free: | |
608 | kfree(root_item); | |
609 | return ret; | |
f46b5a66 CH |
610 | } |
611 | ||
ea14b57f | 612 | static void btrfs_wait_for_no_snapshotting_writes(struct btrfs_root *root) |
8257b2dc MX |
613 | { |
614 | s64 writers; | |
615 | DEFINE_WAIT(wait); | |
616 | ||
617 | do { | |
618 | prepare_to_wait(&root->subv_writers->wait, &wait, | |
619 | TASK_UNINTERRUPTIBLE); | |
620 | ||
621 | writers = percpu_counter_sum(&root->subv_writers->counter); | |
622 | if (writers) | |
623 | schedule(); | |
624 | ||
8257b2dc | 625 | } while (writers); |
69cc7151 | 626 | finish_wait(&root->subv_writers->wait, &wait); |
8257b2dc MX |
627 | } |
628 | ||
e9662f70 | 629 | static int create_snapshot(struct btrfs_root *root, struct inode *dir, |
61d7e4cb | 630 | struct dentry *dentry, |
e9662f70 MX |
631 | u64 *async_transid, bool readonly, |
632 | struct btrfs_qgroup_inherit *inherit) | |
f46b5a66 | 633 | { |
0b246afa | 634 | struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); |
2e4bfab9 | 635 | struct inode *inode; |
f46b5a66 CH |
636 | struct btrfs_pending_snapshot *pending_snapshot; |
637 | struct btrfs_trans_handle *trans; | |
2e4bfab9 | 638 | int ret; |
f46b5a66 | 639 | |
27cdeb70 | 640 | if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) |
f46b5a66 CH |
641 | return -EINVAL; |
642 | ||
23269bf5 | 643 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); |
a1ee7362 DS |
644 | if (!pending_snapshot) |
645 | return -ENOMEM; | |
646 | ||
b0c0ea63 | 647 | pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), |
23269bf5 | 648 | GFP_KERNEL); |
8546b570 DS |
649 | pending_snapshot->path = btrfs_alloc_path(); |
650 | if (!pending_snapshot->root_item || !pending_snapshot->path) { | |
b0c0ea63 DS |
651 | ret = -ENOMEM; |
652 | goto free_pending; | |
653 | } | |
654 | ||
ea14b57f | 655 | atomic_inc(&root->will_be_snapshotted); |
4e857c58 | 656 | smp_mb__after_atomic(); |
ea14b57f | 657 | btrfs_wait_for_no_snapshotting_writes(root); |
8257b2dc | 658 | |
6a03843d MX |
659 | ret = btrfs_start_delalloc_inodes(root, 0); |
660 | if (ret) | |
a1ee7362 | 661 | goto dec_and_free; |
6a03843d | 662 | |
6374e57a | 663 | btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); |
6a03843d | 664 | |
66d8f3dd MX |
665 | btrfs_init_block_rsv(&pending_snapshot->block_rsv, |
666 | BTRFS_BLOCK_RSV_TEMP); | |
d5c12070 MX |
667 | /* |
668 | * 1 - parent dir inode | |
669 | * 2 - dir entries | |
670 | * 1 - root item | |
671 | * 2 - root ref/backref | |
672 | * 1 - root of snapshot | |
dd5f9615 | 673 | * 1 - UUID item |
d5c12070 MX |
674 | */ |
675 | ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, | |
dd5f9615 | 676 | &pending_snapshot->block_rsv, 8, |
ee3441b4 JM |
677 | &pending_snapshot->qgroup_reserved, |
678 | false); | |
d5c12070 | 679 | if (ret) |
a1ee7362 | 680 | goto dec_and_free; |
d5c12070 | 681 | |
3de4586c | 682 | pending_snapshot->dentry = dentry; |
f46b5a66 | 683 | pending_snapshot->root = root; |
b83cc969 | 684 | pending_snapshot->readonly = readonly; |
e9662f70 | 685 | pending_snapshot->dir = dir; |
8696c533 | 686 | pending_snapshot->inherit = inherit; |
a22285a6 | 687 | |
d5c12070 | 688 | trans = btrfs_start_transaction(root, 0); |
a22285a6 YZ |
689 | if (IS_ERR(trans)) { |
690 | ret = PTR_ERR(trans); | |
691 | goto fail; | |
692 | } | |
693 | ||
0b246afa | 694 | spin_lock(&fs_info->trans_lock); |
f46b5a66 CH |
695 | list_add(&pending_snapshot->list, |
696 | &trans->transaction->pending_snapshots); | |
0b246afa | 697 | spin_unlock(&fs_info->trans_lock); |
72fd032e SW |
698 | if (async_transid) { |
699 | *async_transid = trans->transid; | |
3a45bb20 | 700 | ret = btrfs_commit_transaction_async(trans, 1); |
00d71c9c | 701 | if (ret) |
3a45bb20 | 702 | ret = btrfs_commit_transaction(trans); |
72fd032e | 703 | } else { |
3a45bb20 | 704 | ret = btrfs_commit_transaction(trans); |
72fd032e | 705 | } |
aec8030a | 706 | if (ret) |
c37b2b62 | 707 | goto fail; |
a22285a6 YZ |
708 | |
709 | ret = pending_snapshot->error; | |
710 | if (ret) | |
711 | goto fail; | |
712 | ||
d3797308 CM |
713 | ret = btrfs_orphan_cleanup(pending_snapshot->snap); |
714 | if (ret) | |
715 | goto fail; | |
716 | ||
2b0143b5 | 717 | inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); |
2e4bfab9 YZ |
718 | if (IS_ERR(inode)) { |
719 | ret = PTR_ERR(inode); | |
720 | goto fail; | |
721 | } | |
5662344b | 722 | |
2e4bfab9 YZ |
723 | d_instantiate(dentry, inode); |
724 | ret = 0; | |
725 | fail: | |
7775c818 | 726 | btrfs_subvolume_release_metadata(fs_info, &pending_snapshot->block_rsv); |
a1ee7362 | 727 | dec_and_free: |
ea14b57f DS |
728 | if (atomic_dec_and_test(&root->will_be_snapshotted)) |
729 | wake_up_atomic_t(&root->will_be_snapshotted); | |
b0c0ea63 DS |
730 | free_pending: |
731 | kfree(pending_snapshot->root_item); | |
8546b570 | 732 | btrfs_free_path(pending_snapshot->path); |
a1ee7362 DS |
733 | kfree(pending_snapshot); |
734 | ||
f46b5a66 CH |
735 | return ret; |
736 | } | |
737 | ||
4260f7c7 SW |
738 | /* copy of may_delete in fs/namei.c() |
739 | * Check whether we can remove a link victim from directory dir, check | |
740 | * whether the type of victim is right. | |
741 | * 1. We can't do it if dir is read-only (done in permission()) | |
742 | * 2. We should have write and exec permissions on dir | |
743 | * 3. We can't remove anything from append-only dir | |
744 | * 4. We can't do anything with immutable dir (done in permission()) | |
745 | * 5. If the sticky bit on dir is set we should either | |
746 | * a. be owner of dir, or | |
747 | * b. be owner of victim, or | |
748 | * c. have CAP_FOWNER capability | |
01327610 | 749 | * 6. If the victim is append-only or immutable we can't do anything with |
4260f7c7 SW |
750 | * links pointing to it. |
751 | * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. | |
752 | * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. | |
753 | * 9. We can't remove a root or mountpoint. | |
754 | * 10. We don't allow removal of NFS sillyrenamed files; it's handled by | |
755 | * nfs_async_unlink(). | |
756 | */ | |
757 | ||
67871254 | 758 | static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) |
4260f7c7 SW |
759 | { |
760 | int error; | |
761 | ||
2b0143b5 | 762 | if (d_really_is_negative(victim)) |
4260f7c7 SW |
763 | return -ENOENT; |
764 | ||
2b0143b5 | 765 | BUG_ON(d_inode(victim->d_parent) != dir); |
4fa6b5ec | 766 | audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); |
4260f7c7 SW |
767 | |
768 | error = inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
769 | if (error) | |
770 | return error; | |
771 | if (IS_APPEND(dir)) | |
772 | return -EPERM; | |
2b0143b5 DH |
773 | if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) || |
774 | IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim))) | |
4260f7c7 SW |
775 | return -EPERM; |
776 | if (isdir) { | |
e36cb0b8 | 777 | if (!d_is_dir(victim)) |
4260f7c7 SW |
778 | return -ENOTDIR; |
779 | if (IS_ROOT(victim)) | |
780 | return -EBUSY; | |
e36cb0b8 | 781 | } else if (d_is_dir(victim)) |
4260f7c7 SW |
782 | return -EISDIR; |
783 | if (IS_DEADDIR(dir)) | |
784 | return -ENOENT; | |
785 | if (victim->d_flags & DCACHE_NFSFS_RENAMED) | |
786 | return -EBUSY; | |
787 | return 0; | |
788 | } | |
789 | ||
cb8e7090 CH |
790 | /* copy of may_create in fs/namei.c() */ |
791 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
792 | { | |
2b0143b5 | 793 | if (d_really_is_positive(child)) |
cb8e7090 CH |
794 | return -EEXIST; |
795 | if (IS_DEADDIR(dir)) | |
796 | return -ENOENT; | |
797 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
798 | } | |
799 | ||
800 | /* | |
801 | * Create a new subvolume below @parent. This is largely modeled after | |
802 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
803 | * inside this filesystem so it's quite a bit simpler. | |
804 | */ | |
92872094 | 805 | static noinline int btrfs_mksubvol(const struct path *parent, |
52f75f4f | 806 | const char *name, int namelen, |
72fd032e | 807 | struct btrfs_root *snap_src, |
6f72c7e2 | 808 | u64 *async_transid, bool readonly, |
8696c533 | 809 | struct btrfs_qgroup_inherit *inherit) |
cb8e7090 | 810 | { |
0b246afa JM |
811 | struct inode *dir = d_inode(parent->dentry); |
812 | struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); | |
cb8e7090 CH |
813 | struct dentry *dentry; |
814 | int error; | |
815 | ||
00235411 AV |
816 | error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); |
817 | if (error == -EINTR) | |
818 | return error; | |
cb8e7090 CH |
819 | |
820 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
821 | error = PTR_ERR(dentry); | |
822 | if (IS_ERR(dentry)) | |
823 | goto out_unlock; | |
824 | ||
76dda93c | 825 | error = btrfs_may_create(dir, dentry); |
cb8e7090 | 826 | if (error) |
a874a63e | 827 | goto out_dput; |
cb8e7090 | 828 | |
9c52057c CM |
829 | /* |
830 | * even if this name doesn't exist, we may get hash collisions. | |
831 | * check for them now when we can safely fail | |
832 | */ | |
833 | error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, | |
834 | dir->i_ino, name, | |
835 | namelen); | |
836 | if (error) | |
837 | goto out_dput; | |
838 | ||
0b246afa | 839 | down_read(&fs_info->subvol_sem); |
76dda93c YZ |
840 | |
841 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) | |
842 | goto out_up_read; | |
843 | ||
3de4586c | 844 | if (snap_src) { |
61d7e4cb | 845 | error = create_snapshot(snap_src, dir, dentry, |
6f72c7e2 | 846 | async_transid, readonly, inherit); |
3de4586c | 847 | } else { |
d5c12070 MX |
848 | error = create_subvol(dir, dentry, name, namelen, |
849 | async_transid, inherit); | |
3de4586c | 850 | } |
76dda93c YZ |
851 | if (!error) |
852 | fsnotify_mkdir(dir, dentry); | |
853 | out_up_read: | |
0b246afa | 854 | up_read(&fs_info->subvol_sem); |
cb8e7090 CH |
855 | out_dput: |
856 | dput(dentry); | |
857 | out_unlock: | |
5955102c | 858 | inode_unlock(dir); |
cb8e7090 CH |
859 | return error; |
860 | } | |
861 | ||
4cb5300b CM |
862 | /* |
863 | * When we're defragging a range, we don't want to kick it off again | |
864 | * if it is really just waiting for delalloc to send it down. | |
865 | * If we find a nice big extent or delalloc range for the bytes in the | |
866 | * file you want to defrag, we return 0 to let you know to skip this | |
867 | * part of the file | |
868 | */ | |
aab110ab | 869 | static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) |
4cb5300b CM |
870 | { |
871 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
872 | struct extent_map *em = NULL; | |
873 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
874 | u64 end; | |
875 | ||
876 | read_lock(&em_tree->lock); | |
09cbfeaf | 877 | em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE); |
4cb5300b CM |
878 | read_unlock(&em_tree->lock); |
879 | ||
880 | if (em) { | |
881 | end = extent_map_end(em); | |
882 | free_extent_map(em); | |
883 | if (end - offset > thresh) | |
884 | return 0; | |
885 | } | |
886 | /* if we already have a nice delalloc here, just stop */ | |
887 | thresh /= 2; | |
888 | end = count_range_bits(io_tree, &offset, offset + thresh, | |
889 | thresh, EXTENT_DELALLOC, 1); | |
890 | if (end >= thresh) | |
891 | return 0; | |
892 | return 1; | |
893 | } | |
894 | ||
895 | /* | |
896 | * helper function to walk through a file and find extents | |
897 | * newer than a specific transid, and smaller than thresh. | |
898 | * | |
899 | * This is used by the defragging code to find new and small | |
900 | * extents | |
901 | */ | |
902 | static int find_new_extents(struct btrfs_root *root, | |
903 | struct inode *inode, u64 newer_than, | |
aab110ab | 904 | u64 *off, u32 thresh) |
4cb5300b CM |
905 | { |
906 | struct btrfs_path *path; | |
907 | struct btrfs_key min_key; | |
4cb5300b CM |
908 | struct extent_buffer *leaf; |
909 | struct btrfs_file_extent_item *extent; | |
910 | int type; | |
911 | int ret; | |
4a0cc7ca | 912 | u64 ino = btrfs_ino(BTRFS_I(inode)); |
4cb5300b CM |
913 | |
914 | path = btrfs_alloc_path(); | |
915 | if (!path) | |
916 | return -ENOMEM; | |
917 | ||
a4689d2b | 918 | min_key.objectid = ino; |
4cb5300b CM |
919 | min_key.type = BTRFS_EXTENT_DATA_KEY; |
920 | min_key.offset = *off; | |
921 | ||
67871254 | 922 | while (1) { |
6174d3cb | 923 | ret = btrfs_search_forward(root, &min_key, path, newer_than); |
4cb5300b CM |
924 | if (ret != 0) |
925 | goto none; | |
f094c9bd | 926 | process_slot: |
a4689d2b | 927 | if (min_key.objectid != ino) |
4cb5300b CM |
928 | goto none; |
929 | if (min_key.type != BTRFS_EXTENT_DATA_KEY) | |
930 | goto none; | |
931 | ||
932 | leaf = path->nodes[0]; | |
933 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
934 | struct btrfs_file_extent_item); | |
935 | ||
936 | type = btrfs_file_extent_type(leaf, extent); | |
937 | if (type == BTRFS_FILE_EXTENT_REG && | |
938 | btrfs_file_extent_num_bytes(leaf, extent) < thresh && | |
939 | check_defrag_in_cache(inode, min_key.offset, thresh)) { | |
940 | *off = min_key.offset; | |
941 | btrfs_free_path(path); | |
942 | return 0; | |
943 | } | |
944 | ||
f094c9bd FM |
945 | path->slots[0]++; |
946 | if (path->slots[0] < btrfs_header_nritems(leaf)) { | |
947 | btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); | |
948 | goto process_slot; | |
949 | } | |
950 | ||
4cb5300b CM |
951 | if (min_key.offset == (u64)-1) |
952 | goto none; | |
953 | ||
954 | min_key.offset++; | |
955 | btrfs_release_path(path); | |
956 | } | |
957 | none: | |
958 | btrfs_free_path(path); | |
959 | return -ENOENT; | |
960 | } | |
961 | ||
6c282eb4 | 962 | static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) |
17ce6ef8 LB |
963 | { |
964 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
6c282eb4 LZ |
965 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
966 | struct extent_map *em; | |
09cbfeaf | 967 | u64 len = PAGE_SIZE; |
17ce6ef8 | 968 | |
6c282eb4 LZ |
969 | /* |
970 | * hopefully we have this extent in the tree already, try without | |
971 | * the full extent lock | |
972 | */ | |
17ce6ef8 | 973 | read_lock(&em_tree->lock); |
6c282eb4 | 974 | em = lookup_extent_mapping(em_tree, start, len); |
17ce6ef8 LB |
975 | read_unlock(&em_tree->lock); |
976 | ||
6c282eb4 | 977 | if (!em) { |
308d9800 FM |
978 | struct extent_state *cached = NULL; |
979 | u64 end = start + len - 1; | |
980 | ||
6c282eb4 | 981 | /* get the big lock and read metadata off disk */ |
ff13db41 | 982 | lock_extent_bits(io_tree, start, end, &cached); |
fc4f21b1 | 983 | em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len, 0); |
308d9800 | 984 | unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS); |
6c282eb4 LZ |
985 | |
986 | if (IS_ERR(em)) | |
987 | return NULL; | |
988 | } | |
989 | ||
990 | return em; | |
991 | } | |
17ce6ef8 | 992 | |
6c282eb4 LZ |
993 | static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) |
994 | { | |
995 | struct extent_map *next; | |
996 | bool ret = true; | |
997 | ||
998 | /* this is the last extent */ | |
999 | if (em->start + em->len >= i_size_read(inode)) | |
1000 | return false; | |
1001 | ||
1002 | next = defrag_lookup_extent(inode, em->start + em->len); | |
e9512d72 CM |
1003 | if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) |
1004 | ret = false; | |
1005 | else if ((em->block_start + em->block_len == next->block_start) && | |
ee22184b | 1006 | (em->block_len > SZ_128K && next->block_len > SZ_128K)) |
6c282eb4 LZ |
1007 | ret = false; |
1008 | ||
1009 | free_extent_map(next); | |
17ce6ef8 LB |
1010 | return ret; |
1011 | } | |
1012 | ||
aab110ab | 1013 | static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, |
a43a2111 AM |
1014 | u64 *last_len, u64 *skip, u64 *defrag_end, |
1015 | int compress) | |
940100a4 | 1016 | { |
6c282eb4 | 1017 | struct extent_map *em; |
940100a4 | 1018 | int ret = 1; |
6c282eb4 | 1019 | bool next_mergeable = true; |
4a3560c4 | 1020 | bool prev_mergeable = true; |
940100a4 CM |
1021 | |
1022 | /* | |
008873ea | 1023 | * make sure that once we start defragging an extent, we keep on |
940100a4 CM |
1024 | * defragging it |
1025 | */ | |
1026 | if (start < *defrag_end) | |
1027 | return 1; | |
1028 | ||
1029 | *skip = 0; | |
1030 | ||
6c282eb4 LZ |
1031 | em = defrag_lookup_extent(inode, start); |
1032 | if (!em) | |
1033 | return 0; | |
940100a4 CM |
1034 | |
1035 | /* this will cover holes, and inline extents */ | |
17ce6ef8 | 1036 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { |
940100a4 | 1037 | ret = 0; |
17ce6ef8 LB |
1038 | goto out; |
1039 | } | |
1040 | ||
4a3560c4 LB |
1041 | if (!*defrag_end) |
1042 | prev_mergeable = false; | |
1043 | ||
6c282eb4 | 1044 | next_mergeable = defrag_check_next_extent(inode, em); |
940100a4 | 1045 | /* |
6c282eb4 LZ |
1046 | * we hit a real extent, if it is big or the next extent is not a |
1047 | * real extent, don't bother defragging it | |
940100a4 | 1048 | */ |
a43a2111 | 1049 | if (!compress && (*last_len == 0 || *last_len >= thresh) && |
4a3560c4 | 1050 | (em->len >= thresh || (!next_mergeable && !prev_mergeable))) |
940100a4 | 1051 | ret = 0; |
17ce6ef8 | 1052 | out: |
940100a4 CM |
1053 | /* |
1054 | * last_len ends up being a counter of how many bytes we've defragged. | |
1055 | * every time we choose not to defrag an extent, we reset *last_len | |
1056 | * so that the next tiny extent will force a defrag. | |
1057 | * | |
1058 | * The end result of this is that tiny extents before a single big | |
1059 | * extent will force at least part of that big extent to be defragged. | |
1060 | */ | |
1061 | if (ret) { | |
940100a4 CM |
1062 | *defrag_end = extent_map_end(em); |
1063 | } else { | |
1064 | *last_len = 0; | |
1065 | *skip = extent_map_end(em); | |
1066 | *defrag_end = 0; | |
1067 | } | |
1068 | ||
1069 | free_extent_map(em); | |
1070 | return ret; | |
1071 | } | |
1072 | ||
4cb5300b CM |
1073 | /* |
1074 | * it doesn't do much good to defrag one or two pages | |
1075 | * at a time. This pulls in a nice chunk of pages | |
1076 | * to COW and defrag. | |
1077 | * | |
1078 | * It also makes sure the delalloc code has enough | |
1079 | * dirty data to avoid making new small extents as part | |
1080 | * of the defrag | |
1081 | * | |
1082 | * It's a good idea to start RA on this range | |
1083 | * before calling this. | |
1084 | */ | |
1085 | static int cluster_pages_for_defrag(struct inode *inode, | |
1086 | struct page **pages, | |
1087 | unsigned long start_index, | |
c41570c9 | 1088 | unsigned long num_pages) |
f46b5a66 | 1089 | { |
4cb5300b CM |
1090 | unsigned long file_end; |
1091 | u64 isize = i_size_read(inode); | |
1092 | u64 page_start; | |
1093 | u64 page_end; | |
1f12bd06 | 1094 | u64 page_cnt; |
4cb5300b CM |
1095 | int ret; |
1096 | int i; | |
1097 | int i_done; | |
3eaa2885 | 1098 | struct btrfs_ordered_extent *ordered; |
4cb5300b | 1099 | struct extent_state *cached_state = NULL; |
600a45e1 | 1100 | struct extent_io_tree *tree; |
364ecf36 | 1101 | struct extent_changeset *data_reserved = NULL; |
3b16a4e3 | 1102 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
4cb5300b | 1103 | |
09cbfeaf | 1104 | file_end = (isize - 1) >> PAGE_SHIFT; |
1f12bd06 LB |
1105 | if (!isize || start_index > file_end) |
1106 | return 0; | |
1107 | ||
1108 | page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); | |
4cb5300b | 1109 | |
364ecf36 | 1110 | ret = btrfs_delalloc_reserve_space(inode, &data_reserved, |
09cbfeaf KS |
1111 | start_index << PAGE_SHIFT, |
1112 | page_cnt << PAGE_SHIFT); | |
4cb5300b CM |
1113 | if (ret) |
1114 | return ret; | |
4cb5300b | 1115 | i_done = 0; |
600a45e1 | 1116 | tree = &BTRFS_I(inode)->io_tree; |
4cb5300b CM |
1117 | |
1118 | /* step one, lock all the pages */ | |
1f12bd06 | 1119 | for (i = 0; i < page_cnt; i++) { |
4cb5300b | 1120 | struct page *page; |
600a45e1 | 1121 | again: |
a94733d0 | 1122 | page = find_or_create_page(inode->i_mapping, |
600a45e1 | 1123 | start_index + i, mask); |
4cb5300b CM |
1124 | if (!page) |
1125 | break; | |
1126 | ||
600a45e1 | 1127 | page_start = page_offset(page); |
09cbfeaf | 1128 | page_end = page_start + PAGE_SIZE - 1; |
600a45e1 | 1129 | while (1) { |
308d9800 | 1130 | lock_extent_bits(tree, page_start, page_end, |
ff13db41 | 1131 | &cached_state); |
600a45e1 MX |
1132 | ordered = btrfs_lookup_ordered_extent(inode, |
1133 | page_start); | |
308d9800 FM |
1134 | unlock_extent_cached(tree, page_start, page_end, |
1135 | &cached_state, GFP_NOFS); | |
600a45e1 MX |
1136 | if (!ordered) |
1137 | break; | |
1138 | ||
1139 | unlock_page(page); | |
1140 | btrfs_start_ordered_extent(inode, ordered, 1); | |
1141 | btrfs_put_ordered_extent(ordered); | |
1142 | lock_page(page); | |
1f12bd06 LB |
1143 | /* |
1144 | * we unlocked the page above, so we need check if | |
1145 | * it was released or not. | |
1146 | */ | |
1147 | if (page->mapping != inode->i_mapping) { | |
1148 | unlock_page(page); | |
09cbfeaf | 1149 | put_page(page); |
1f12bd06 LB |
1150 | goto again; |
1151 | } | |
600a45e1 MX |
1152 | } |
1153 | ||
4cb5300b CM |
1154 | if (!PageUptodate(page)) { |
1155 | btrfs_readpage(NULL, page); | |
1156 | lock_page(page); | |
1157 | if (!PageUptodate(page)) { | |
1158 | unlock_page(page); | |
09cbfeaf | 1159 | put_page(page); |
4cb5300b CM |
1160 | ret = -EIO; |
1161 | break; | |
1162 | } | |
1163 | } | |
600a45e1 | 1164 | |
600a45e1 MX |
1165 | if (page->mapping != inode->i_mapping) { |
1166 | unlock_page(page); | |
09cbfeaf | 1167 | put_page(page); |
600a45e1 MX |
1168 | goto again; |
1169 | } | |
1170 | ||
4cb5300b CM |
1171 | pages[i] = page; |
1172 | i_done++; | |
1173 | } | |
1174 | if (!i_done || ret) | |
1175 | goto out; | |
1176 | ||
1177 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
1178 | goto out; | |
1179 | ||
1180 | /* | |
1181 | * so now we have a nice long stream of locked | |
1182 | * and up to date pages, lets wait on them | |
1183 | */ | |
1184 | for (i = 0; i < i_done; i++) | |
1185 | wait_on_page_writeback(pages[i]); | |
1186 | ||
1187 | page_start = page_offset(pages[0]); | |
09cbfeaf | 1188 | page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; |
4cb5300b CM |
1189 | |
1190 | lock_extent_bits(&BTRFS_I(inode)->io_tree, | |
ff13db41 | 1191 | page_start, page_end - 1, &cached_state); |
4cb5300b CM |
1192 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, |
1193 | page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | | |
9e8a4a8b LB |
1194 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, |
1195 | &cached_state, GFP_NOFS); | |
4cb5300b | 1196 | |
1f12bd06 | 1197 | if (i_done != page_cnt) { |
9e0baf60 JB |
1198 | spin_lock(&BTRFS_I(inode)->lock); |
1199 | BTRFS_I(inode)->outstanding_extents++; | |
1200 | spin_unlock(&BTRFS_I(inode)->lock); | |
bc42bda2 | 1201 | btrfs_delalloc_release_space(inode, data_reserved, |
09cbfeaf KS |
1202 | start_index << PAGE_SHIFT, |
1203 | (page_cnt - i_done) << PAGE_SHIFT); | |
4cb5300b CM |
1204 | } |
1205 | ||
1206 | ||
9e8a4a8b | 1207 | set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, |
018ed4f7 | 1208 | &cached_state); |
4cb5300b CM |
1209 | |
1210 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, | |
1211 | page_start, page_end - 1, &cached_state, | |
1212 | GFP_NOFS); | |
1213 | ||
1214 | for (i = 0; i < i_done; i++) { | |
1215 | clear_page_dirty_for_io(pages[i]); | |
1216 | ClearPageChecked(pages[i]); | |
1217 | set_page_extent_mapped(pages[i]); | |
1218 | set_page_dirty(pages[i]); | |
1219 | unlock_page(pages[i]); | |
09cbfeaf | 1220 | put_page(pages[i]); |
4cb5300b | 1221 | } |
364ecf36 | 1222 | extent_changeset_free(data_reserved); |
4cb5300b CM |
1223 | return i_done; |
1224 | out: | |
1225 | for (i = 0; i < i_done; i++) { | |
1226 | unlock_page(pages[i]); | |
09cbfeaf | 1227 | put_page(pages[i]); |
4cb5300b | 1228 | } |
bc42bda2 | 1229 | btrfs_delalloc_release_space(inode, data_reserved, |
09cbfeaf KS |
1230 | start_index << PAGE_SHIFT, |
1231 | page_cnt << PAGE_SHIFT); | |
364ecf36 | 1232 | extent_changeset_free(data_reserved); |
4cb5300b CM |
1233 | return ret; |
1234 | ||
1235 | } | |
1236 | ||
1237 | int btrfs_defrag_file(struct inode *inode, struct file *file, | |
1238 | struct btrfs_ioctl_defrag_range_args *range, | |
1239 | u64 newer_than, unsigned long max_to_defrag) | |
1240 | { | |
0b246afa | 1241 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
4cb5300b | 1242 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4cb5300b | 1243 | struct file_ra_state *ra = NULL; |
f46b5a66 | 1244 | unsigned long last_index; |
151a31b2 | 1245 | u64 isize = i_size_read(inode); |
940100a4 CM |
1246 | u64 last_len = 0; |
1247 | u64 skip = 0; | |
1248 | u64 defrag_end = 0; | |
4cb5300b | 1249 | u64 newer_off = range->start; |
f46b5a66 | 1250 | unsigned long i; |
008873ea | 1251 | unsigned long ra_index = 0; |
f46b5a66 | 1252 | int ret; |
4cb5300b | 1253 | int defrag_count = 0; |
1a419d85 | 1254 | int compress_type = BTRFS_COMPRESS_ZLIB; |
aab110ab | 1255 | u32 extent_thresh = range->extent_thresh; |
09cbfeaf | 1256 | unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; |
c41570c9 | 1257 | unsigned long cluster = max_cluster; |
ee22184b | 1258 | u64 new_align = ~((u64)SZ_128K - 1); |
4cb5300b | 1259 | struct page **pages = NULL; |
1e2ef46d | 1260 | bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; |
4cb5300b | 1261 | |
0abd5b17 LB |
1262 | if (isize == 0) |
1263 | return 0; | |
1264 | ||
1265 | if (range->start >= isize) | |
1266 | return -EINVAL; | |
1a419d85 | 1267 | |
1e2ef46d | 1268 | if (do_compress) { |
1a419d85 LZ |
1269 | if (range->compress_type > BTRFS_COMPRESS_TYPES) |
1270 | return -EINVAL; | |
1271 | if (range->compress_type) | |
1272 | compress_type = range->compress_type; | |
1273 | } | |
f46b5a66 | 1274 | |
0abd5b17 | 1275 | if (extent_thresh == 0) |
ee22184b | 1276 | extent_thresh = SZ_256K; |
940100a4 | 1277 | |
4cb5300b | 1278 | /* |
0a52d108 DS |
1279 | * If we were not given a file, allocate a readahead context. As |
1280 | * readahead is just an optimization, defrag will work without it so | |
1281 | * we don't error out. | |
4cb5300b CM |
1282 | */ |
1283 | if (!file) { | |
63e727ec | 1284 | ra = kzalloc(sizeof(*ra), GFP_KERNEL); |
0a52d108 DS |
1285 | if (ra) |
1286 | file_ra_state_init(ra, inode->i_mapping); | |
4cb5300b CM |
1287 | } else { |
1288 | ra = &file->f_ra; | |
1289 | } | |
1290 | ||
63e727ec | 1291 | pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL); |
4cb5300b CM |
1292 | if (!pages) { |
1293 | ret = -ENOMEM; | |
1294 | goto out_ra; | |
1295 | } | |
1296 | ||
1297 | /* find the last page to defrag */ | |
1e701a32 | 1298 | if (range->start + range->len > range->start) { |
151a31b2 | 1299 | last_index = min_t(u64, isize - 1, |
09cbfeaf | 1300 | range->start + range->len - 1) >> PAGE_SHIFT; |
1e701a32 | 1301 | } else { |
09cbfeaf | 1302 | last_index = (isize - 1) >> PAGE_SHIFT; |
1e701a32 CM |
1303 | } |
1304 | ||
4cb5300b CM |
1305 | if (newer_than) { |
1306 | ret = find_new_extents(root, inode, newer_than, | |
ee22184b | 1307 | &newer_off, SZ_64K); |
4cb5300b CM |
1308 | if (!ret) { |
1309 | range->start = newer_off; | |
1310 | /* | |
1311 | * we always align our defrag to help keep | |
1312 | * the extents in the file evenly spaced | |
1313 | */ | |
09cbfeaf | 1314 | i = (newer_off & new_align) >> PAGE_SHIFT; |
4cb5300b CM |
1315 | } else |
1316 | goto out_ra; | |
1317 | } else { | |
09cbfeaf | 1318 | i = range->start >> PAGE_SHIFT; |
4cb5300b CM |
1319 | } |
1320 | if (!max_to_defrag) | |
070034bd | 1321 | max_to_defrag = last_index - i + 1; |
4cb5300b | 1322 | |
2a0f7f57 LZ |
1323 | /* |
1324 | * make writeback starts from i, so the defrag range can be | |
1325 | * written sequentially. | |
1326 | */ | |
1327 | if (i < inode->i_mapping->writeback_index) | |
1328 | inode->i_mapping->writeback_index = i; | |
1329 | ||
f7f43cc8 | 1330 | while (i <= last_index && defrag_count < max_to_defrag && |
09cbfeaf | 1331 | (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { |
4cb5300b CM |
1332 | /* |
1333 | * make sure we stop running if someone unmounts | |
1334 | * the FS | |
1335 | */ | |
1336 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
1337 | break; | |
1338 | ||
0b246afa JM |
1339 | if (btrfs_defrag_cancelled(fs_info)) { |
1340 | btrfs_debug(fs_info, "defrag_file cancelled"); | |
210549eb DS |
1341 | ret = -EAGAIN; |
1342 | break; | |
1343 | } | |
1344 | ||
09cbfeaf | 1345 | if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, |
6c282eb4 | 1346 | extent_thresh, &last_len, &skip, |
1e2ef46d | 1347 | &defrag_end, do_compress)){ |
940100a4 CM |
1348 | unsigned long next; |
1349 | /* | |
1350 | * the should_defrag function tells us how much to skip | |
1351 | * bump our counter by the suggested amount | |
1352 | */ | |
09cbfeaf | 1353 | next = DIV_ROUND_UP(skip, PAGE_SIZE); |
940100a4 CM |
1354 | i = max(i + 1, next); |
1355 | continue; | |
1356 | } | |
008873ea LZ |
1357 | |
1358 | if (!newer_than) { | |
09cbfeaf KS |
1359 | cluster = (PAGE_ALIGN(defrag_end) >> |
1360 | PAGE_SHIFT) - i; | |
008873ea LZ |
1361 | cluster = min(cluster, max_cluster); |
1362 | } else { | |
1363 | cluster = max_cluster; | |
1364 | } | |
1365 | ||
008873ea LZ |
1366 | if (i + cluster > ra_index) { |
1367 | ra_index = max(i, ra_index); | |
0a52d108 | 1368 | if (ra) |
d3c0bab5 DS |
1369 | page_cache_sync_readahead(inode->i_mapping, ra, |
1370 | file, ra_index, cluster); | |
e4826a5b | 1371 | ra_index += cluster; |
008873ea | 1372 | } |
940100a4 | 1373 | |
5955102c | 1374 | inode_lock(inode); |
1e2ef46d | 1375 | if (do_compress) |
eec63c65 | 1376 | BTRFS_I(inode)->defrag_compress = compress_type; |
008873ea | 1377 | ret = cluster_pages_for_defrag(inode, pages, i, cluster); |
ecb8bea8 | 1378 | if (ret < 0) { |
5955102c | 1379 | inode_unlock(inode); |
4cb5300b | 1380 | goto out_ra; |
ecb8bea8 | 1381 | } |
4cb5300b CM |
1382 | |
1383 | defrag_count += ret; | |
d0e1d66b | 1384 | balance_dirty_pages_ratelimited(inode->i_mapping); |
5955102c | 1385 | inode_unlock(inode); |
4cb5300b CM |
1386 | |
1387 | if (newer_than) { | |
1388 | if (newer_off == (u64)-1) | |
1389 | break; | |
1390 | ||
e1f041e1 LB |
1391 | if (ret > 0) |
1392 | i += ret; | |
1393 | ||
4cb5300b | 1394 | newer_off = max(newer_off + 1, |
09cbfeaf | 1395 | (u64)i << PAGE_SHIFT); |
4cb5300b | 1396 | |
ee22184b BL |
1397 | ret = find_new_extents(root, inode, newer_than, |
1398 | &newer_off, SZ_64K); | |
4cb5300b CM |
1399 | if (!ret) { |
1400 | range->start = newer_off; | |
09cbfeaf | 1401 | i = (newer_off & new_align) >> PAGE_SHIFT; |
4cb5300b CM |
1402 | } else { |
1403 | break; | |
f46b5a66 | 1404 | } |
4cb5300b | 1405 | } else { |
008873ea | 1406 | if (ret > 0) { |
cbcc8326 | 1407 | i += ret; |
09cbfeaf | 1408 | last_len += ret << PAGE_SHIFT; |
008873ea | 1409 | } else { |
cbcc8326 | 1410 | i++; |
008873ea LZ |
1411 | last_len = 0; |
1412 | } | |
f46b5a66 | 1413 | } |
f46b5a66 CH |
1414 | } |
1415 | ||
dec8ef90 | 1416 | if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { |
1e701a32 | 1417 | filemap_flush(inode->i_mapping); |
dec8ef90 FM |
1418 | if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, |
1419 | &BTRFS_I(inode)->runtime_flags)) | |
1420 | filemap_flush(inode->i_mapping); | |
1421 | } | |
1e701a32 | 1422 | |
1e2ef46d | 1423 | if (do_compress) { |
1e701a32 CM |
1424 | /* the filemap_flush will queue IO into the worker threads, but |
1425 | * we have to make sure the IO is actually started and that | |
1426 | * ordered extents get created before we return | |
1427 | */ | |
0b246afa JM |
1428 | atomic_inc(&fs_info->async_submit_draining); |
1429 | while (atomic_read(&fs_info->nr_async_submits) || | |
1430 | atomic_read(&fs_info->async_delalloc_pages)) { | |
1431 | wait_event(fs_info->async_submit_wait, | |
1432 | (atomic_read(&fs_info->nr_async_submits) == 0 && | |
1433 | atomic_read(&fs_info->async_delalloc_pages) == 0)); | |
1e701a32 | 1434 | } |
0b246afa | 1435 | atomic_dec(&fs_info->async_submit_draining); |
1e701a32 CM |
1436 | } |
1437 | ||
1a419d85 | 1438 | if (range->compress_type == BTRFS_COMPRESS_LZO) { |
0b246afa | 1439 | btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); |
5c1aab1d NT |
1440 | } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) { |
1441 | btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); | |
1a419d85 LZ |
1442 | } |
1443 | ||
60ccf82f | 1444 | ret = defrag_count; |
940100a4 | 1445 | |
4cb5300b | 1446 | out_ra: |
1e2ef46d | 1447 | if (do_compress) { |
5955102c | 1448 | inode_lock(inode); |
eec63c65 | 1449 | BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; |
5955102c | 1450 | inode_unlock(inode); |
633085c7 | 1451 | } |
4cb5300b CM |
1452 | if (!file) |
1453 | kfree(ra); | |
1454 | kfree(pages); | |
940100a4 | 1455 | return ret; |
f46b5a66 CH |
1456 | } |
1457 | ||
198605a8 | 1458 | static noinline int btrfs_ioctl_resize(struct file *file, |
76dda93c | 1459 | void __user *arg) |
f46b5a66 | 1460 | { |
0b246afa JM |
1461 | struct inode *inode = file_inode(file); |
1462 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
f46b5a66 CH |
1463 | u64 new_size; |
1464 | u64 old_size; | |
1465 | u64 devid = 1; | |
0b246afa | 1466 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f46b5a66 CH |
1467 | struct btrfs_ioctl_vol_args *vol_args; |
1468 | struct btrfs_trans_handle *trans; | |
1469 | struct btrfs_device *device = NULL; | |
1470 | char *sizestr; | |
9a40f122 | 1471 | char *retptr; |
f46b5a66 CH |
1472 | char *devstr = NULL; |
1473 | int ret = 0; | |
f46b5a66 CH |
1474 | int mod = 0; |
1475 | ||
e441d54d CM |
1476 | if (!capable(CAP_SYS_ADMIN)) |
1477 | return -EPERM; | |
1478 | ||
198605a8 MX |
1479 | ret = mnt_want_write_file(file); |
1480 | if (ret) | |
1481 | return ret; | |
1482 | ||
171938e5 | 1483 | if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { |
97547676 | 1484 | mnt_drop_write_file(file); |
e57138b3 | 1485 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
c9e9f97b ID |
1486 | } |
1487 | ||
0b246afa | 1488 | mutex_lock(&fs_info->volume_mutex); |
dae7b665 | 1489 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
1490 | if (IS_ERR(vol_args)) { |
1491 | ret = PTR_ERR(vol_args); | |
1492 | goto out; | |
1493 | } | |
5516e595 MF |
1494 | |
1495 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 1496 | |
f46b5a66 CH |
1497 | sizestr = vol_args->name; |
1498 | devstr = strchr(sizestr, ':'); | |
1499 | if (devstr) { | |
f46b5a66 CH |
1500 | sizestr = devstr + 1; |
1501 | *devstr = '\0'; | |
1502 | devstr = vol_args->name; | |
58dfae63 Z |
1503 | ret = kstrtoull(devstr, 10, &devid); |
1504 | if (ret) | |
1505 | goto out_free; | |
dfd79829 MX |
1506 | if (!devid) { |
1507 | ret = -EINVAL; | |
1508 | goto out_free; | |
1509 | } | |
0b246afa | 1510 | btrfs_info(fs_info, "resizing devid %llu", devid); |
f46b5a66 | 1511 | } |
dba60f3f | 1512 | |
0b246afa | 1513 | device = btrfs_find_device(fs_info, devid, NULL, NULL); |
f46b5a66 | 1514 | if (!device) { |
0b246afa JM |
1515 | btrfs_info(fs_info, "resizer unable to find device %llu", |
1516 | devid); | |
dfd79829 | 1517 | ret = -ENODEV; |
c9e9f97b | 1518 | goto out_free; |
f46b5a66 | 1519 | } |
dba60f3f MX |
1520 | |
1521 | if (!device->writeable) { | |
0b246afa | 1522 | btrfs_info(fs_info, |
efe120a0 | 1523 | "resizer unable to apply on readonly device %llu", |
c1c9ff7c | 1524 | devid); |
dfd79829 | 1525 | ret = -EPERM; |
4e42ae1b LB |
1526 | goto out_free; |
1527 | } | |
1528 | ||
f46b5a66 CH |
1529 | if (!strcmp(sizestr, "max")) |
1530 | new_size = device->bdev->bd_inode->i_size; | |
1531 | else { | |
1532 | if (sizestr[0] == '-') { | |
1533 | mod = -1; | |
1534 | sizestr++; | |
1535 | } else if (sizestr[0] == '+') { | |
1536 | mod = 1; | |
1537 | sizestr++; | |
1538 | } | |
9a40f122 GH |
1539 | new_size = memparse(sizestr, &retptr); |
1540 | if (*retptr != '\0' || new_size == 0) { | |
f46b5a66 | 1541 | ret = -EINVAL; |
c9e9f97b | 1542 | goto out_free; |
f46b5a66 CH |
1543 | } |
1544 | } | |
1545 | ||
63a212ab | 1546 | if (device->is_tgtdev_for_dev_replace) { |
dfd79829 | 1547 | ret = -EPERM; |
63a212ab SB |
1548 | goto out_free; |
1549 | } | |
1550 | ||
7cc8e58d | 1551 | old_size = btrfs_device_get_total_bytes(device); |
f46b5a66 CH |
1552 | |
1553 | if (mod < 0) { | |
1554 | if (new_size > old_size) { | |
1555 | ret = -EINVAL; | |
c9e9f97b | 1556 | goto out_free; |
f46b5a66 CH |
1557 | } |
1558 | new_size = old_size - new_size; | |
1559 | } else if (mod > 0) { | |
eb8052e0 | 1560 | if (new_size > ULLONG_MAX - old_size) { |
902c68a4 | 1561 | ret = -ERANGE; |
eb8052e0 WF |
1562 | goto out_free; |
1563 | } | |
f46b5a66 CH |
1564 | new_size = old_size + new_size; |
1565 | } | |
1566 | ||
ee22184b | 1567 | if (new_size < SZ_256M) { |
f46b5a66 | 1568 | ret = -EINVAL; |
c9e9f97b | 1569 | goto out_free; |
f46b5a66 CH |
1570 | } |
1571 | if (new_size > device->bdev->bd_inode->i_size) { | |
1572 | ret = -EFBIG; | |
c9e9f97b | 1573 | goto out_free; |
f46b5a66 CH |
1574 | } |
1575 | ||
47f08b96 | 1576 | new_size = round_down(new_size, fs_info->sectorsize); |
f46b5a66 | 1577 | |
0b246afa JM |
1578 | btrfs_info_in_rcu(fs_info, "new size for %s is %llu", |
1579 | rcu_str_deref(device->name), new_size); | |
f46b5a66 CH |
1580 | |
1581 | if (new_size > old_size) { | |
a22285a6 | 1582 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1583 | if (IS_ERR(trans)) { |
1584 | ret = PTR_ERR(trans); | |
c9e9f97b | 1585 | goto out_free; |
98d5dc13 | 1586 | } |
f46b5a66 | 1587 | ret = btrfs_grow_device(trans, device, new_size); |
3a45bb20 | 1588 | btrfs_commit_transaction(trans); |
ece7d20e | 1589 | } else if (new_size < old_size) { |
f46b5a66 | 1590 | ret = btrfs_shrink_device(device, new_size); |
0253f40e | 1591 | } /* equal, nothing need to do */ |
f46b5a66 | 1592 | |
c9e9f97b | 1593 | out_free: |
f46b5a66 | 1594 | kfree(vol_args); |
c9e9f97b | 1595 | out: |
0b246afa | 1596 | mutex_unlock(&fs_info->volume_mutex); |
171938e5 | 1597 | clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); |
18f39c41 | 1598 | mnt_drop_write_file(file); |
f46b5a66 CH |
1599 | return ret; |
1600 | } | |
1601 | ||
72fd032e | 1602 | static noinline int btrfs_ioctl_snap_create_transid(struct file *file, |
52f75f4f | 1603 | const char *name, unsigned long fd, int subvol, |
6f72c7e2 | 1604 | u64 *transid, bool readonly, |
8696c533 | 1605 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 | 1606 | { |
f46b5a66 | 1607 | int namelen; |
3de4586c | 1608 | int ret = 0; |
f46b5a66 | 1609 | |
325c50e3 JM |
1610 | if (!S_ISDIR(file_inode(file)->i_mode)) |
1611 | return -ENOTDIR; | |
1612 | ||
a874a63e LB |
1613 | ret = mnt_want_write_file(file); |
1614 | if (ret) | |
1615 | goto out; | |
1616 | ||
72fd032e SW |
1617 | namelen = strlen(name); |
1618 | if (strchr(name, '/')) { | |
f46b5a66 | 1619 | ret = -EINVAL; |
a874a63e | 1620 | goto out_drop_write; |
f46b5a66 CH |
1621 | } |
1622 | ||
16780cab CM |
1623 | if (name[0] == '.' && |
1624 | (namelen == 1 || (name[1] == '.' && namelen == 2))) { | |
1625 | ret = -EEXIST; | |
a874a63e | 1626 | goto out_drop_write; |
16780cab CM |
1627 | } |
1628 | ||
3de4586c | 1629 | if (subvol) { |
72fd032e | 1630 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
6f72c7e2 | 1631 | NULL, transid, readonly, inherit); |
cb8e7090 | 1632 | } else { |
2903ff01 | 1633 | struct fd src = fdget(fd); |
3de4586c | 1634 | struct inode *src_inode; |
2903ff01 | 1635 | if (!src.file) { |
3de4586c | 1636 | ret = -EINVAL; |
a874a63e | 1637 | goto out_drop_write; |
3de4586c CM |
1638 | } |
1639 | ||
496ad9aa AV |
1640 | src_inode = file_inode(src.file); |
1641 | if (src_inode->i_sb != file_inode(file)->i_sb) { | |
c79b4713 | 1642 | btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, |
efe120a0 | 1643 | "Snapshot src from another FS"); |
23ad5b17 | 1644 | ret = -EXDEV; |
d0242061 DS |
1645 | } else if (!inode_owner_or_capable(src_inode)) { |
1646 | /* | |
1647 | * Subvolume creation is not restricted, but snapshots | |
1648 | * are limited to own subvolumes only | |
1649 | */ | |
1650 | ret = -EPERM; | |
ecd18815 AV |
1651 | } else { |
1652 | ret = btrfs_mksubvol(&file->f_path, name, namelen, | |
1653 | BTRFS_I(src_inode)->root, | |
1654 | transid, readonly, inherit); | |
3de4586c | 1655 | } |
2903ff01 | 1656 | fdput(src); |
cb8e7090 | 1657 | } |
a874a63e LB |
1658 | out_drop_write: |
1659 | mnt_drop_write_file(file); | |
f46b5a66 | 1660 | out: |
72fd032e SW |
1661 | return ret; |
1662 | } | |
1663 | ||
1664 | static noinline int btrfs_ioctl_snap_create(struct file *file, | |
fa0d2b9b | 1665 | void __user *arg, int subvol) |
72fd032e | 1666 | { |
fa0d2b9b | 1667 | struct btrfs_ioctl_vol_args *vol_args; |
72fd032e SW |
1668 | int ret; |
1669 | ||
325c50e3 JM |
1670 | if (!S_ISDIR(file_inode(file)->i_mode)) |
1671 | return -ENOTDIR; | |
1672 | ||
fa0d2b9b LZ |
1673 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1674 | if (IS_ERR(vol_args)) | |
1675 | return PTR_ERR(vol_args); | |
1676 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
72fd032e | 1677 | |
fa0d2b9b | 1678 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, |
b83cc969 | 1679 | vol_args->fd, subvol, |
6f72c7e2 | 1680 | NULL, false, NULL); |
fdfb1e4f | 1681 | |
fa0d2b9b LZ |
1682 | kfree(vol_args); |
1683 | return ret; | |
1684 | } | |
fdfb1e4f | 1685 | |
fa0d2b9b LZ |
1686 | static noinline int btrfs_ioctl_snap_create_v2(struct file *file, |
1687 | void __user *arg, int subvol) | |
1688 | { | |
1689 | struct btrfs_ioctl_vol_args_v2 *vol_args; | |
1690 | int ret; | |
1691 | u64 transid = 0; | |
1692 | u64 *ptr = NULL; | |
b83cc969 | 1693 | bool readonly = false; |
6f72c7e2 | 1694 | struct btrfs_qgroup_inherit *inherit = NULL; |
75eaa0e2 | 1695 | |
325c50e3 JM |
1696 | if (!S_ISDIR(file_inode(file)->i_mode)) |
1697 | return -ENOTDIR; | |
1698 | ||
fa0d2b9b LZ |
1699 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1700 | if (IS_ERR(vol_args)) | |
1701 | return PTR_ERR(vol_args); | |
1702 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; | |
75eaa0e2 | 1703 | |
b83cc969 | 1704 | if (vol_args->flags & |
6f72c7e2 AJ |
1705 | ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | |
1706 | BTRFS_SUBVOL_QGROUP_INHERIT)) { | |
b83cc969 | 1707 | ret = -EOPNOTSUPP; |
c47ca32d | 1708 | goto free_args; |
72fd032e | 1709 | } |
fa0d2b9b LZ |
1710 | |
1711 | if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) | |
1712 | ptr = &transid; | |
b83cc969 LZ |
1713 | if (vol_args->flags & BTRFS_SUBVOL_RDONLY) |
1714 | readonly = true; | |
6f72c7e2 | 1715 | if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { |
09cbfeaf | 1716 | if (vol_args->size > PAGE_SIZE) { |
6f72c7e2 | 1717 | ret = -EINVAL; |
c47ca32d | 1718 | goto free_args; |
6f72c7e2 AJ |
1719 | } |
1720 | inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); | |
1721 | if (IS_ERR(inherit)) { | |
1722 | ret = PTR_ERR(inherit); | |
c47ca32d | 1723 | goto free_args; |
6f72c7e2 AJ |
1724 | } |
1725 | } | |
fa0d2b9b LZ |
1726 | |
1727 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, | |
6f72c7e2 | 1728 | vol_args->fd, subvol, ptr, |
8696c533 | 1729 | readonly, inherit); |
c47ca32d DC |
1730 | if (ret) |
1731 | goto free_inherit; | |
fa0d2b9b | 1732 | |
c47ca32d DC |
1733 | if (ptr && copy_to_user(arg + |
1734 | offsetof(struct btrfs_ioctl_vol_args_v2, | |
1735 | transid), | |
1736 | ptr, sizeof(*ptr))) | |
fa0d2b9b | 1737 | ret = -EFAULT; |
c47ca32d DC |
1738 | |
1739 | free_inherit: | |
6f72c7e2 | 1740 | kfree(inherit); |
c47ca32d DC |
1741 | free_args: |
1742 | kfree(vol_args); | |
f46b5a66 CH |
1743 | return ret; |
1744 | } | |
1745 | ||
0caa102d LZ |
1746 | static noinline int btrfs_ioctl_subvol_getflags(struct file *file, |
1747 | void __user *arg) | |
1748 | { | |
496ad9aa | 1749 | struct inode *inode = file_inode(file); |
0b246afa | 1750 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
0caa102d LZ |
1751 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1752 | int ret = 0; | |
1753 | u64 flags = 0; | |
1754 | ||
4a0cc7ca | 1755 | if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) |
0caa102d LZ |
1756 | return -EINVAL; |
1757 | ||
0b246afa | 1758 | down_read(&fs_info->subvol_sem); |
0caa102d LZ |
1759 | if (btrfs_root_readonly(root)) |
1760 | flags |= BTRFS_SUBVOL_RDONLY; | |
0b246afa | 1761 | up_read(&fs_info->subvol_sem); |
0caa102d LZ |
1762 | |
1763 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
1764 | ret = -EFAULT; | |
1765 | ||
1766 | return ret; | |
1767 | } | |
1768 | ||
1769 | static noinline int btrfs_ioctl_subvol_setflags(struct file *file, | |
1770 | void __user *arg) | |
1771 | { | |
496ad9aa | 1772 | struct inode *inode = file_inode(file); |
0b246afa | 1773 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
0caa102d LZ |
1774 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1775 | struct btrfs_trans_handle *trans; | |
1776 | u64 root_flags; | |
1777 | u64 flags; | |
1778 | int ret = 0; | |
1779 | ||
bd60ea0f DS |
1780 | if (!inode_owner_or_capable(inode)) |
1781 | return -EPERM; | |
1782 | ||
b9ca0664 LB |
1783 | ret = mnt_want_write_file(file); |
1784 | if (ret) | |
1785 | goto out; | |
0caa102d | 1786 | |
4a0cc7ca | 1787 | if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { |
b9ca0664 LB |
1788 | ret = -EINVAL; |
1789 | goto out_drop_write; | |
1790 | } | |
0caa102d | 1791 | |
b9ca0664 LB |
1792 | if (copy_from_user(&flags, arg, sizeof(flags))) { |
1793 | ret = -EFAULT; | |
1794 | goto out_drop_write; | |
1795 | } | |
0caa102d | 1796 | |
b9ca0664 LB |
1797 | if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { |
1798 | ret = -EINVAL; | |
1799 | goto out_drop_write; | |
1800 | } | |
0caa102d | 1801 | |
b9ca0664 LB |
1802 | if (flags & ~BTRFS_SUBVOL_RDONLY) { |
1803 | ret = -EOPNOTSUPP; | |
1804 | goto out_drop_write; | |
1805 | } | |
0caa102d | 1806 | |
0b246afa | 1807 | down_write(&fs_info->subvol_sem); |
0caa102d LZ |
1808 | |
1809 | /* nothing to do */ | |
1810 | if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) | |
b9ca0664 | 1811 | goto out_drop_sem; |
0caa102d LZ |
1812 | |
1813 | root_flags = btrfs_root_flags(&root->root_item); | |
2c686537 | 1814 | if (flags & BTRFS_SUBVOL_RDONLY) { |
0caa102d LZ |
1815 | btrfs_set_root_flags(&root->root_item, |
1816 | root_flags | BTRFS_ROOT_SUBVOL_RDONLY); | |
2c686537 DS |
1817 | } else { |
1818 | /* | |
1819 | * Block RO -> RW transition if this subvolume is involved in | |
1820 | * send | |
1821 | */ | |
1822 | spin_lock(&root->root_item_lock); | |
1823 | if (root->send_in_progress == 0) { | |
1824 | btrfs_set_root_flags(&root->root_item, | |
0caa102d | 1825 | root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); |
2c686537 DS |
1826 | spin_unlock(&root->root_item_lock); |
1827 | } else { | |
1828 | spin_unlock(&root->root_item_lock); | |
0b246afa JM |
1829 | btrfs_warn(fs_info, |
1830 | "Attempt to set subvolume %llu read-write during send", | |
1831 | root->root_key.objectid); | |
2c686537 DS |
1832 | ret = -EPERM; |
1833 | goto out_drop_sem; | |
1834 | } | |
1835 | } | |
0caa102d LZ |
1836 | |
1837 | trans = btrfs_start_transaction(root, 1); | |
1838 | if (IS_ERR(trans)) { | |
1839 | ret = PTR_ERR(trans); | |
1840 | goto out_reset; | |
1841 | } | |
1842 | ||
0b246afa | 1843 | ret = btrfs_update_root(trans, fs_info->tree_root, |
0caa102d LZ |
1844 | &root->root_key, &root->root_item); |
1845 | ||
3a45bb20 | 1846 | btrfs_commit_transaction(trans); |
0caa102d LZ |
1847 | out_reset: |
1848 | if (ret) | |
1849 | btrfs_set_root_flags(&root->root_item, root_flags); | |
b9ca0664 | 1850 | out_drop_sem: |
0b246afa | 1851 | up_write(&fs_info->subvol_sem); |
b9ca0664 LB |
1852 | out_drop_write: |
1853 | mnt_drop_write_file(file); | |
1854 | out: | |
0caa102d LZ |
1855 | return ret; |
1856 | } | |
1857 | ||
76dda93c YZ |
1858 | /* |
1859 | * helper to check if the subvolume references other subvolumes | |
1860 | */ | |
1861 | static noinline int may_destroy_subvol(struct btrfs_root *root) | |
1862 | { | |
0b246afa | 1863 | struct btrfs_fs_info *fs_info = root->fs_info; |
76dda93c | 1864 | struct btrfs_path *path; |
175a2b87 | 1865 | struct btrfs_dir_item *di; |
76dda93c | 1866 | struct btrfs_key key; |
175a2b87 | 1867 | u64 dir_id; |
76dda93c YZ |
1868 | int ret; |
1869 | ||
1870 | path = btrfs_alloc_path(); | |
1871 | if (!path) | |
1872 | return -ENOMEM; | |
1873 | ||
175a2b87 | 1874 | /* Make sure this root isn't set as the default subvol */ |
0b246afa JM |
1875 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
1876 | di = btrfs_lookup_dir_item(NULL, fs_info->tree_root, path, | |
175a2b87 JB |
1877 | dir_id, "default", 7, 0); |
1878 | if (di && !IS_ERR(di)) { | |
1879 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); | |
1880 | if (key.objectid == root->root_key.objectid) { | |
72de6b53 | 1881 | ret = -EPERM; |
0b246afa | 1882 | btrfs_err(fs_info, |
5d163e0e JM |
1883 | "deleting default subvolume %llu is not allowed", |
1884 | key.objectid); | |
175a2b87 JB |
1885 | goto out; |
1886 | } | |
1887 | btrfs_release_path(path); | |
1888 | } | |
1889 | ||
76dda93c YZ |
1890 | key.objectid = root->root_key.objectid; |
1891 | key.type = BTRFS_ROOT_REF_KEY; | |
1892 | key.offset = (u64)-1; | |
1893 | ||
0b246afa | 1894 | ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); |
76dda93c YZ |
1895 | if (ret < 0) |
1896 | goto out; | |
1897 | BUG_ON(ret == 0); | |
1898 | ||
1899 | ret = 0; | |
1900 | if (path->slots[0] > 0) { | |
1901 | path->slots[0]--; | |
1902 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1903 | if (key.objectid == root->root_key.objectid && | |
1904 | key.type == BTRFS_ROOT_REF_KEY) | |
1905 | ret = -ENOTEMPTY; | |
1906 | } | |
1907 | out: | |
1908 | btrfs_free_path(path); | |
1909 | return ret; | |
1910 | } | |
1911 | ||
ac8e9819 CM |
1912 | static noinline int key_in_sk(struct btrfs_key *key, |
1913 | struct btrfs_ioctl_search_key *sk) | |
1914 | { | |
abc6e134 CM |
1915 | struct btrfs_key test; |
1916 | int ret; | |
1917 | ||
1918 | test.objectid = sk->min_objectid; | |
1919 | test.type = sk->min_type; | |
1920 | test.offset = sk->min_offset; | |
1921 | ||
1922 | ret = btrfs_comp_cpu_keys(key, &test); | |
1923 | if (ret < 0) | |
ac8e9819 | 1924 | return 0; |
abc6e134 CM |
1925 | |
1926 | test.objectid = sk->max_objectid; | |
1927 | test.type = sk->max_type; | |
1928 | test.offset = sk->max_offset; | |
1929 | ||
1930 | ret = btrfs_comp_cpu_keys(key, &test); | |
1931 | if (ret > 0) | |
ac8e9819 CM |
1932 | return 0; |
1933 | return 1; | |
1934 | } | |
1935 | ||
df397565 | 1936 | static noinline int copy_to_sk(struct btrfs_path *path, |
ac8e9819 CM |
1937 | struct btrfs_key *key, |
1938 | struct btrfs_ioctl_search_key *sk, | |
9b6e817d | 1939 | size_t *buf_size, |
ba346b35 | 1940 | char __user *ubuf, |
ac8e9819 CM |
1941 | unsigned long *sk_offset, |
1942 | int *num_found) | |
1943 | { | |
1944 | u64 found_transid; | |
1945 | struct extent_buffer *leaf; | |
1946 | struct btrfs_ioctl_search_header sh; | |
dd81d459 | 1947 | struct btrfs_key test; |
ac8e9819 CM |
1948 | unsigned long item_off; |
1949 | unsigned long item_len; | |
1950 | int nritems; | |
1951 | int i; | |
1952 | int slot; | |
ac8e9819 CM |
1953 | int ret = 0; |
1954 | ||
1955 | leaf = path->nodes[0]; | |
1956 | slot = path->slots[0]; | |
1957 | nritems = btrfs_header_nritems(leaf); | |
1958 | ||
1959 | if (btrfs_header_generation(leaf) > sk->max_transid) { | |
1960 | i = nritems; | |
1961 | goto advance_key; | |
1962 | } | |
1963 | found_transid = btrfs_header_generation(leaf); | |
1964 | ||
1965 | for (i = slot; i < nritems; i++) { | |
1966 | item_off = btrfs_item_ptr_offset(leaf, i); | |
1967 | item_len = btrfs_item_size_nr(leaf, i); | |
1968 | ||
03b71c6c GP |
1969 | btrfs_item_key_to_cpu(leaf, key, i); |
1970 | if (!key_in_sk(key, sk)) | |
1971 | continue; | |
1972 | ||
9b6e817d | 1973 | if (sizeof(sh) + item_len > *buf_size) { |
8f5f6178 GH |
1974 | if (*num_found) { |
1975 | ret = 1; | |
1976 | goto out; | |
1977 | } | |
1978 | ||
1979 | /* | |
1980 | * return one empty item back for v1, which does not | |
1981 | * handle -EOVERFLOW | |
1982 | */ | |
1983 | ||
9b6e817d | 1984 | *buf_size = sizeof(sh) + item_len; |
ac8e9819 | 1985 | item_len = 0; |
8f5f6178 GH |
1986 | ret = -EOVERFLOW; |
1987 | } | |
ac8e9819 | 1988 | |
9b6e817d | 1989 | if (sizeof(sh) + item_len + *sk_offset > *buf_size) { |
ac8e9819 | 1990 | ret = 1; |
25c9bc2e | 1991 | goto out; |
ac8e9819 CM |
1992 | } |
1993 | ||
ac8e9819 CM |
1994 | sh.objectid = key->objectid; |
1995 | sh.offset = key->offset; | |
1996 | sh.type = key->type; | |
1997 | sh.len = item_len; | |
1998 | sh.transid = found_transid; | |
1999 | ||
2000 | /* copy search result header */ | |
ba346b35 GH |
2001 | if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) { |
2002 | ret = -EFAULT; | |
2003 | goto out; | |
2004 | } | |
2005 | ||
ac8e9819 CM |
2006 | *sk_offset += sizeof(sh); |
2007 | ||
2008 | if (item_len) { | |
ba346b35 | 2009 | char __user *up = ubuf + *sk_offset; |
ac8e9819 | 2010 | /* copy the item */ |
ba346b35 GH |
2011 | if (read_extent_buffer_to_user(leaf, up, |
2012 | item_off, item_len)) { | |
2013 | ret = -EFAULT; | |
2014 | goto out; | |
2015 | } | |
2016 | ||
ac8e9819 | 2017 | *sk_offset += item_len; |
ac8e9819 | 2018 | } |
e2156867 | 2019 | (*num_found)++; |
ac8e9819 | 2020 | |
8f5f6178 GH |
2021 | if (ret) /* -EOVERFLOW from above */ |
2022 | goto out; | |
2023 | ||
25c9bc2e GH |
2024 | if (*num_found >= sk->nr_items) { |
2025 | ret = 1; | |
2026 | goto out; | |
2027 | } | |
ac8e9819 CM |
2028 | } |
2029 | advance_key: | |
abc6e134 | 2030 | ret = 0; |
dd81d459 NA |
2031 | test.objectid = sk->max_objectid; |
2032 | test.type = sk->max_type; | |
2033 | test.offset = sk->max_offset; | |
2034 | if (btrfs_comp_cpu_keys(key, &test) >= 0) | |
2035 | ret = 1; | |
2036 | else if (key->offset < (u64)-1) | |
ac8e9819 | 2037 | key->offset++; |
dd81d459 | 2038 | else if (key->type < (u8)-1) { |
abc6e134 | 2039 | key->offset = 0; |
ac8e9819 | 2040 | key->type++; |
dd81d459 | 2041 | } else if (key->objectid < (u64)-1) { |
abc6e134 CM |
2042 | key->offset = 0; |
2043 | key->type = 0; | |
ac8e9819 | 2044 | key->objectid++; |
abc6e134 CM |
2045 | } else |
2046 | ret = 1; | |
25c9bc2e | 2047 | out: |
ba346b35 GH |
2048 | /* |
2049 | * 0: all items from this leaf copied, continue with next | |
2050 | * 1: * more items can be copied, but unused buffer is too small | |
2051 | * * all items were found | |
2052 | * Either way, it will stops the loop which iterates to the next | |
2053 | * leaf | |
2054 | * -EOVERFLOW: item was to large for buffer | |
2055 | * -EFAULT: could not copy extent buffer back to userspace | |
2056 | */ | |
ac8e9819 CM |
2057 | return ret; |
2058 | } | |
2059 | ||
2060 | static noinline int search_ioctl(struct inode *inode, | |
12544442 | 2061 | struct btrfs_ioctl_search_key *sk, |
9b6e817d | 2062 | size_t *buf_size, |
ba346b35 | 2063 | char __user *ubuf) |
ac8e9819 | 2064 | { |
0b246afa | 2065 | struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); |
ac8e9819 CM |
2066 | struct btrfs_root *root; |
2067 | struct btrfs_key key; | |
ac8e9819 | 2068 | struct btrfs_path *path; |
ac8e9819 CM |
2069 | int ret; |
2070 | int num_found = 0; | |
2071 | unsigned long sk_offset = 0; | |
2072 | ||
9b6e817d GH |
2073 | if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { |
2074 | *buf_size = sizeof(struct btrfs_ioctl_search_header); | |
12544442 | 2075 | return -EOVERFLOW; |
9b6e817d | 2076 | } |
12544442 | 2077 | |
ac8e9819 CM |
2078 | path = btrfs_alloc_path(); |
2079 | if (!path) | |
2080 | return -ENOMEM; | |
2081 | ||
2082 | if (sk->tree_id == 0) { | |
2083 | /* search the root of the inode that was passed */ | |
2084 | root = BTRFS_I(inode)->root; | |
2085 | } else { | |
2086 | key.objectid = sk->tree_id; | |
2087 | key.type = BTRFS_ROOT_ITEM_KEY; | |
2088 | key.offset = (u64)-1; | |
2089 | root = btrfs_read_fs_root_no_name(info, &key); | |
2090 | if (IS_ERR(root)) { | |
ac8e9819 CM |
2091 | btrfs_free_path(path); |
2092 | return -ENOENT; | |
2093 | } | |
2094 | } | |
2095 | ||
2096 | key.objectid = sk->min_objectid; | |
2097 | key.type = sk->min_type; | |
2098 | key.offset = sk->min_offset; | |
2099 | ||
67871254 | 2100 | while (1) { |
6174d3cb | 2101 | ret = btrfs_search_forward(root, &key, path, sk->min_transid); |
ac8e9819 CM |
2102 | if (ret != 0) { |
2103 | if (ret > 0) | |
2104 | ret = 0; | |
2105 | goto err; | |
2106 | } | |
df397565 | 2107 | ret = copy_to_sk(path, &key, sk, buf_size, ubuf, |
ac8e9819 | 2108 | &sk_offset, &num_found); |
b3b4aa74 | 2109 | btrfs_release_path(path); |
25c9bc2e | 2110 | if (ret) |
ac8e9819 CM |
2111 | break; |
2112 | ||
2113 | } | |
8f5f6178 GH |
2114 | if (ret > 0) |
2115 | ret = 0; | |
ac8e9819 CM |
2116 | err: |
2117 | sk->nr_items = num_found; | |
2118 | btrfs_free_path(path); | |
2119 | return ret; | |
2120 | } | |
2121 | ||
2122 | static noinline int btrfs_ioctl_tree_search(struct file *file, | |
2123 | void __user *argp) | |
2124 | { | |
ba346b35 GH |
2125 | struct btrfs_ioctl_search_args __user *uargs; |
2126 | struct btrfs_ioctl_search_key sk; | |
9b6e817d GH |
2127 | struct inode *inode; |
2128 | int ret; | |
2129 | size_t buf_size; | |
ac8e9819 CM |
2130 | |
2131 | if (!capable(CAP_SYS_ADMIN)) | |
2132 | return -EPERM; | |
2133 | ||
ba346b35 GH |
2134 | uargs = (struct btrfs_ioctl_search_args __user *)argp; |
2135 | ||
2136 | if (copy_from_user(&sk, &uargs->key, sizeof(sk))) | |
2137 | return -EFAULT; | |
ac8e9819 | 2138 | |
ba346b35 | 2139 | buf_size = sizeof(uargs->buf); |
ac8e9819 | 2140 | |
496ad9aa | 2141 | inode = file_inode(file); |
ba346b35 | 2142 | ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); |
8f5f6178 GH |
2143 | |
2144 | /* | |
2145 | * In the origin implementation an overflow is handled by returning a | |
2146 | * search header with a len of zero, so reset ret. | |
2147 | */ | |
2148 | if (ret == -EOVERFLOW) | |
2149 | ret = 0; | |
2150 | ||
ba346b35 | 2151 | if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) |
ac8e9819 | 2152 | ret = -EFAULT; |
ac8e9819 CM |
2153 | return ret; |
2154 | } | |
2155 | ||
cc68a8a5 GH |
2156 | static noinline int btrfs_ioctl_tree_search_v2(struct file *file, |
2157 | void __user *argp) | |
2158 | { | |
2159 | struct btrfs_ioctl_search_args_v2 __user *uarg; | |
2160 | struct btrfs_ioctl_search_args_v2 args; | |
2161 | struct inode *inode; | |
2162 | int ret; | |
2163 | size_t buf_size; | |
ee22184b | 2164 | const size_t buf_limit = SZ_16M; |
cc68a8a5 GH |
2165 | |
2166 | if (!capable(CAP_SYS_ADMIN)) | |
2167 | return -EPERM; | |
2168 | ||
2169 | /* copy search header and buffer size */ | |
2170 | uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; | |
2171 | if (copy_from_user(&args, uarg, sizeof(args))) | |
2172 | return -EFAULT; | |
2173 | ||
2174 | buf_size = args.buf_size; | |
2175 | ||
cc68a8a5 GH |
2176 | /* limit result size to 16MB */ |
2177 | if (buf_size > buf_limit) | |
2178 | buf_size = buf_limit; | |
2179 | ||
2180 | inode = file_inode(file); | |
2181 | ret = search_ioctl(inode, &args.key, &buf_size, | |
2182 | (char *)(&uarg->buf[0])); | |
2183 | if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) | |
2184 | ret = -EFAULT; | |
2185 | else if (ret == -EOVERFLOW && | |
2186 | copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) | |
2187 | ret = -EFAULT; | |
2188 | ||
ac8e9819 CM |
2189 | return ret; |
2190 | } | |
2191 | ||
98d377a0 | 2192 | /* |
ac8e9819 CM |
2193 | * Search INODE_REFs to identify path name of 'dirid' directory |
2194 | * in a 'tree_id' tree. and sets path name to 'name'. | |
2195 | */ | |
98d377a0 TH |
2196 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
2197 | u64 tree_id, u64 dirid, char *name) | |
2198 | { | |
2199 | struct btrfs_root *root; | |
2200 | struct btrfs_key key; | |
ac8e9819 | 2201 | char *ptr; |
98d377a0 TH |
2202 | int ret = -1; |
2203 | int slot; | |
2204 | int len; | |
2205 | int total_len = 0; | |
2206 | struct btrfs_inode_ref *iref; | |
2207 | struct extent_buffer *l; | |
2208 | struct btrfs_path *path; | |
2209 | ||
2210 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { | |
2211 | name[0]='\0'; | |
2212 | return 0; | |
2213 | } | |
2214 | ||
2215 | path = btrfs_alloc_path(); | |
2216 | if (!path) | |
2217 | return -ENOMEM; | |
2218 | ||
ac8e9819 | 2219 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; |
98d377a0 TH |
2220 | |
2221 | key.objectid = tree_id; | |
2222 | key.type = BTRFS_ROOT_ITEM_KEY; | |
2223 | key.offset = (u64)-1; | |
2224 | root = btrfs_read_fs_root_no_name(info, &key); | |
2225 | if (IS_ERR(root)) { | |
f14d104d | 2226 | btrfs_err(info, "could not find root %llu", tree_id); |
8ad6fcab CM |
2227 | ret = -ENOENT; |
2228 | goto out; | |
98d377a0 TH |
2229 | } |
2230 | ||
2231 | key.objectid = dirid; | |
2232 | key.type = BTRFS_INODE_REF_KEY; | |
8ad6fcab | 2233 | key.offset = (u64)-1; |
98d377a0 | 2234 | |
67871254 | 2235 | while (1) { |
98d377a0 TH |
2236 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
2237 | if (ret < 0) | |
2238 | goto out; | |
18674c6c FDBM |
2239 | else if (ret > 0) { |
2240 | ret = btrfs_previous_item(root, path, dirid, | |
2241 | BTRFS_INODE_REF_KEY); | |
2242 | if (ret < 0) | |
2243 | goto out; | |
2244 | else if (ret > 0) { | |
2245 | ret = -ENOENT; | |
2246 | goto out; | |
2247 | } | |
2248 | } | |
98d377a0 TH |
2249 | |
2250 | l = path->nodes[0]; | |
2251 | slot = path->slots[0]; | |
2252 | btrfs_item_key_to_cpu(l, &key, slot); | |
2253 | ||
98d377a0 TH |
2254 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); |
2255 | len = btrfs_inode_ref_name_len(l, iref); | |
2256 | ptr -= len + 1; | |
2257 | total_len += len + 1; | |
a696cf35 FDBM |
2258 | if (ptr < name) { |
2259 | ret = -ENAMETOOLONG; | |
98d377a0 | 2260 | goto out; |
a696cf35 | 2261 | } |
98d377a0 TH |
2262 | |
2263 | *(ptr + len) = '/'; | |
67871254 | 2264 | read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); |
98d377a0 TH |
2265 | |
2266 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) | |
2267 | break; | |
2268 | ||
b3b4aa74 | 2269 | btrfs_release_path(path); |
98d377a0 | 2270 | key.objectid = key.offset; |
8ad6fcab | 2271 | key.offset = (u64)-1; |
98d377a0 | 2272 | dirid = key.objectid; |
98d377a0 | 2273 | } |
77906a50 | 2274 | memmove(name, ptr, total_len); |
67871254 | 2275 | name[total_len] = '\0'; |
98d377a0 TH |
2276 | ret = 0; |
2277 | out: | |
2278 | btrfs_free_path(path); | |
ac8e9819 CM |
2279 | return ret; |
2280 | } | |
2281 | ||
2282 | static noinline int btrfs_ioctl_ino_lookup(struct file *file, | |
2283 | void __user *argp) | |
2284 | { | |
2285 | struct btrfs_ioctl_ino_lookup_args *args; | |
2286 | struct inode *inode; | |
01b810b8 | 2287 | int ret = 0; |
ac8e9819 | 2288 | |
2354d08f JL |
2289 | args = memdup_user(argp, sizeof(*args)); |
2290 | if (IS_ERR(args)) | |
2291 | return PTR_ERR(args); | |
c2b96929 | 2292 | |
496ad9aa | 2293 | inode = file_inode(file); |
ac8e9819 | 2294 | |
01b810b8 DS |
2295 | /* |
2296 | * Unprivileged query to obtain the containing subvolume root id. The | |
2297 | * path is reset so it's consistent with btrfs_search_path_in_tree. | |
2298 | */ | |
1b53ac4d CM |
2299 | if (args->treeid == 0) |
2300 | args->treeid = BTRFS_I(inode)->root->root_key.objectid; | |
2301 | ||
01b810b8 DS |
2302 | if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { |
2303 | args->name[0] = 0; | |
2304 | goto out; | |
2305 | } | |
2306 | ||
2307 | if (!capable(CAP_SYS_ADMIN)) { | |
2308 | ret = -EPERM; | |
2309 | goto out; | |
2310 | } | |
2311 | ||
ac8e9819 CM |
2312 | ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, |
2313 | args->treeid, args->objectid, | |
2314 | args->name); | |
2315 | ||
01b810b8 | 2316 | out: |
ac8e9819 CM |
2317 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) |
2318 | ret = -EFAULT; | |
2319 | ||
2320 | kfree(args); | |
98d377a0 TH |
2321 | return ret; |
2322 | } | |
2323 | ||
76dda93c YZ |
2324 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
2325 | void __user *arg) | |
2326 | { | |
54563d41 | 2327 | struct dentry *parent = file->f_path.dentry; |
0b246afa | 2328 | struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); |
76dda93c | 2329 | struct dentry *dentry; |
2b0143b5 | 2330 | struct inode *dir = d_inode(parent); |
76dda93c YZ |
2331 | struct inode *inode; |
2332 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2333 | struct btrfs_root *dest = NULL; | |
2334 | struct btrfs_ioctl_vol_args *vol_args; | |
2335 | struct btrfs_trans_handle *trans; | |
c58aaad2 | 2336 | struct btrfs_block_rsv block_rsv; |
521e0546 | 2337 | u64 root_flags; |
c58aaad2 | 2338 | u64 qgroup_reserved; |
76dda93c YZ |
2339 | int namelen; |
2340 | int ret; | |
2341 | int err = 0; | |
2342 | ||
325c50e3 JM |
2343 | if (!S_ISDIR(dir->i_mode)) |
2344 | return -ENOTDIR; | |
2345 | ||
76dda93c YZ |
2346 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
2347 | if (IS_ERR(vol_args)) | |
2348 | return PTR_ERR(vol_args); | |
2349 | ||
2350 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
2351 | namelen = strlen(vol_args->name); | |
2352 | if (strchr(vol_args->name, '/') || | |
2353 | strncmp(vol_args->name, "..", namelen) == 0) { | |
2354 | err = -EINVAL; | |
2355 | goto out; | |
2356 | } | |
2357 | ||
a561be71 | 2358 | err = mnt_want_write_file(file); |
76dda93c YZ |
2359 | if (err) |
2360 | goto out; | |
2361 | ||
521e0546 | 2362 | |
00235411 AV |
2363 | err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); |
2364 | if (err == -EINTR) | |
2365 | goto out_drop_write; | |
76dda93c YZ |
2366 | dentry = lookup_one_len(vol_args->name, parent, namelen); |
2367 | if (IS_ERR(dentry)) { | |
2368 | err = PTR_ERR(dentry); | |
2369 | goto out_unlock_dir; | |
2370 | } | |
2371 | ||
2b0143b5 | 2372 | if (d_really_is_negative(dentry)) { |
76dda93c YZ |
2373 | err = -ENOENT; |
2374 | goto out_dput; | |
2375 | } | |
2376 | ||
2b0143b5 | 2377 | inode = d_inode(dentry); |
4260f7c7 | 2378 | dest = BTRFS_I(inode)->root; |
67871254 | 2379 | if (!capable(CAP_SYS_ADMIN)) { |
4260f7c7 SW |
2380 | /* |
2381 | * Regular user. Only allow this with a special mount | |
2382 | * option, when the user has write+exec access to the | |
2383 | * subvol root, and when rmdir(2) would have been | |
2384 | * allowed. | |
2385 | * | |
2386 | * Note that this is _not_ check that the subvol is | |
2387 | * empty or doesn't contain data that we wouldn't | |
2388 | * otherwise be able to delete. | |
2389 | * | |
2390 | * Users who want to delete empty subvols should try | |
2391 | * rmdir(2). | |
2392 | */ | |
2393 | err = -EPERM; | |
0b246afa | 2394 | if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) |
4260f7c7 SW |
2395 | goto out_dput; |
2396 | ||
2397 | /* | |
2398 | * Do not allow deletion if the parent dir is the same | |
2399 | * as the dir to be deleted. That means the ioctl | |
2400 | * must be called on the dentry referencing the root | |
2401 | * of the subvol, not a random directory contained | |
2402 | * within it. | |
2403 | */ | |
2404 | err = -EINVAL; | |
2405 | if (root == dest) | |
2406 | goto out_dput; | |
2407 | ||
2408 | err = inode_permission(inode, MAY_WRITE | MAY_EXEC); | |
2409 | if (err) | |
2410 | goto out_dput; | |
4260f7c7 SW |
2411 | } |
2412 | ||
5c39da5b MX |
2413 | /* check if subvolume may be deleted by a user */ |
2414 | err = btrfs_may_delete(dir, dentry, 1); | |
2415 | if (err) | |
2416 | goto out_dput; | |
2417 | ||
4a0cc7ca | 2418 | if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { |
76dda93c YZ |
2419 | err = -EINVAL; |
2420 | goto out_dput; | |
2421 | } | |
2422 | ||
5955102c | 2423 | inode_lock(inode); |
521e0546 DS |
2424 | |
2425 | /* | |
2426 | * Don't allow to delete a subvolume with send in progress. This is | |
2427 | * inside the i_mutex so the error handling that has to drop the bit | |
2428 | * again is not run concurrently. | |
2429 | */ | |
2430 | spin_lock(&dest->root_item_lock); | |
c55bfa67 FM |
2431 | root_flags = btrfs_root_flags(&dest->root_item); |
2432 | if (dest->send_in_progress == 0) { | |
2433 | btrfs_set_root_flags(&dest->root_item, | |
521e0546 DS |
2434 | root_flags | BTRFS_ROOT_SUBVOL_DEAD); |
2435 | spin_unlock(&dest->root_item_lock); | |
2436 | } else { | |
2437 | spin_unlock(&dest->root_item_lock); | |
0b246afa JM |
2438 | btrfs_warn(fs_info, |
2439 | "Attempt to delete subvolume %llu during send", | |
2440 | dest->root_key.objectid); | |
521e0546 | 2441 | err = -EPERM; |
909e26dc | 2442 | goto out_unlock_inode; |
521e0546 DS |
2443 | } |
2444 | ||
0b246afa | 2445 | down_write(&fs_info->subvol_sem); |
76dda93c YZ |
2446 | |
2447 | err = may_destroy_subvol(dest); | |
2448 | if (err) | |
2449 | goto out_up_write; | |
2450 | ||
c58aaad2 MX |
2451 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
2452 | /* | |
2453 | * One for dir inode, two for dir entries, two for root | |
2454 | * ref/backref. | |
2455 | */ | |
2456 | err = btrfs_subvolume_reserve_metadata(root, &block_rsv, | |
ee3441b4 | 2457 | 5, &qgroup_reserved, true); |
c58aaad2 MX |
2458 | if (err) |
2459 | goto out_up_write; | |
2460 | ||
a22285a6 YZ |
2461 | trans = btrfs_start_transaction(root, 0); |
2462 | if (IS_ERR(trans)) { | |
2463 | err = PTR_ERR(trans); | |
c58aaad2 | 2464 | goto out_release; |
a22285a6 | 2465 | } |
c58aaad2 MX |
2466 | trans->block_rsv = &block_rsv; |
2467 | trans->bytes_reserved = block_rsv.size; | |
a22285a6 | 2468 | |
43663557 | 2469 | btrfs_record_snapshot_destroy(trans, BTRFS_I(dir)); |
2be63d5c | 2470 | |
76dda93c YZ |
2471 | ret = btrfs_unlink_subvol(trans, root, dir, |
2472 | dest->root_key.objectid, | |
2473 | dentry->d_name.name, | |
2474 | dentry->d_name.len); | |
79787eaa JM |
2475 | if (ret) { |
2476 | err = ret; | |
66642832 | 2477 | btrfs_abort_transaction(trans, ret); |
79787eaa JM |
2478 | goto out_end_trans; |
2479 | } | |
76dda93c YZ |
2480 | |
2481 | btrfs_record_root_in_trans(trans, dest); | |
2482 | ||
2483 | memset(&dest->root_item.drop_progress, 0, | |
2484 | sizeof(dest->root_item.drop_progress)); | |
2485 | dest->root_item.drop_level = 0; | |
2486 | btrfs_set_root_refs(&dest->root_item, 0); | |
2487 | ||
27cdeb70 | 2488 | if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) { |
d68fc57b | 2489 | ret = btrfs_insert_orphan_item(trans, |
0b246afa | 2490 | fs_info->tree_root, |
d68fc57b | 2491 | dest->root_key.objectid); |
79787eaa | 2492 | if (ret) { |
66642832 | 2493 | btrfs_abort_transaction(trans, ret); |
79787eaa JM |
2494 | err = ret; |
2495 | goto out_end_trans; | |
2496 | } | |
d68fc57b | 2497 | } |
dd5f9615 | 2498 | |
0b246afa | 2499 | ret = btrfs_uuid_tree_rem(trans, fs_info, dest->root_item.uuid, |
6bccf3ab | 2500 | BTRFS_UUID_KEY_SUBVOL, |
dd5f9615 SB |
2501 | dest->root_key.objectid); |
2502 | if (ret && ret != -ENOENT) { | |
66642832 | 2503 | btrfs_abort_transaction(trans, ret); |
dd5f9615 SB |
2504 | err = ret; |
2505 | goto out_end_trans; | |
2506 | } | |
2507 | if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { | |
0b246afa | 2508 | ret = btrfs_uuid_tree_rem(trans, fs_info, |
dd5f9615 SB |
2509 | dest->root_item.received_uuid, |
2510 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
2511 | dest->root_key.objectid); | |
2512 | if (ret && ret != -ENOENT) { | |
66642832 | 2513 | btrfs_abort_transaction(trans, ret); |
dd5f9615 SB |
2514 | err = ret; |
2515 | goto out_end_trans; | |
2516 | } | |
2517 | } | |
2518 | ||
79787eaa | 2519 | out_end_trans: |
c58aaad2 MX |
2520 | trans->block_rsv = NULL; |
2521 | trans->bytes_reserved = 0; | |
3a45bb20 | 2522 | ret = btrfs_end_transaction(trans); |
79787eaa JM |
2523 | if (ret && !err) |
2524 | err = ret; | |
76dda93c | 2525 | inode->i_flags |= S_DEAD; |
c58aaad2 | 2526 | out_release: |
7775c818 | 2527 | btrfs_subvolume_release_metadata(fs_info, &block_rsv); |
76dda93c | 2528 | out_up_write: |
0b246afa | 2529 | up_write(&fs_info->subvol_sem); |
521e0546 DS |
2530 | if (err) { |
2531 | spin_lock(&dest->root_item_lock); | |
c55bfa67 FM |
2532 | root_flags = btrfs_root_flags(&dest->root_item); |
2533 | btrfs_set_root_flags(&dest->root_item, | |
521e0546 DS |
2534 | root_flags & ~BTRFS_ROOT_SUBVOL_DEAD); |
2535 | spin_unlock(&dest->root_item_lock); | |
2536 | } | |
909e26dc | 2537 | out_unlock_inode: |
5955102c | 2538 | inode_unlock(inode); |
76dda93c | 2539 | if (!err) { |
64ad6c48 | 2540 | d_invalidate(dentry); |
76dda93c YZ |
2541 | btrfs_invalidate_inodes(dest); |
2542 | d_delete(dentry); | |
61155aa0 | 2543 | ASSERT(dest->send_in_progress == 0); |
fa6ac876 LB |
2544 | |
2545 | /* the last ref */ | |
57cdc8db DS |
2546 | if (dest->ino_cache_inode) { |
2547 | iput(dest->ino_cache_inode); | |
2548 | dest->ino_cache_inode = NULL; | |
fa6ac876 | 2549 | } |
76dda93c YZ |
2550 | } |
2551 | out_dput: | |
2552 | dput(dentry); | |
2553 | out_unlock_dir: | |
5955102c | 2554 | inode_unlock(dir); |
00235411 | 2555 | out_drop_write: |
2a79f17e | 2556 | mnt_drop_write_file(file); |
76dda93c YZ |
2557 | out: |
2558 | kfree(vol_args); | |
2559 | return err; | |
2560 | } | |
2561 | ||
1e701a32 | 2562 | static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
f46b5a66 | 2563 | { |
496ad9aa | 2564 | struct inode *inode = file_inode(file); |
f46b5a66 | 2565 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1e701a32 | 2566 | struct btrfs_ioctl_defrag_range_args *range; |
c146afad YZ |
2567 | int ret; |
2568 | ||
25122d15 ID |
2569 | ret = mnt_want_write_file(file); |
2570 | if (ret) | |
2571 | return ret; | |
b83cc969 | 2572 | |
25122d15 ID |
2573 | if (btrfs_root_readonly(root)) { |
2574 | ret = -EROFS; | |
2575 | goto out; | |
5ac00add | 2576 | } |
f46b5a66 CH |
2577 | |
2578 | switch (inode->i_mode & S_IFMT) { | |
2579 | case S_IFDIR: | |
e441d54d CM |
2580 | if (!capable(CAP_SYS_ADMIN)) { |
2581 | ret = -EPERM; | |
2582 | goto out; | |
2583 | } | |
de78b51a | 2584 | ret = btrfs_defrag_root(root); |
f46b5a66 CH |
2585 | break; |
2586 | case S_IFREG: | |
e441d54d CM |
2587 | if (!(file->f_mode & FMODE_WRITE)) { |
2588 | ret = -EINVAL; | |
2589 | goto out; | |
2590 | } | |
1e701a32 CM |
2591 | |
2592 | range = kzalloc(sizeof(*range), GFP_KERNEL); | |
2593 | if (!range) { | |
2594 | ret = -ENOMEM; | |
2595 | goto out; | |
2596 | } | |
2597 | ||
2598 | if (argp) { | |
2599 | if (copy_from_user(range, argp, | |
2600 | sizeof(*range))) { | |
2601 | ret = -EFAULT; | |
2602 | kfree(range); | |
683be16e | 2603 | goto out; |
1e701a32 CM |
2604 | } |
2605 | /* compression requires us to start the IO */ | |
2606 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
2607 | range->flags |= BTRFS_DEFRAG_RANGE_START_IO; | |
2608 | range->extent_thresh = (u32)-1; | |
2609 | } | |
2610 | } else { | |
2611 | /* the rest are all set to zero by kzalloc */ | |
2612 | range->len = (u64)-1; | |
2613 | } | |
496ad9aa | 2614 | ret = btrfs_defrag_file(file_inode(file), file, |
4cb5300b CM |
2615 | range, 0, 0); |
2616 | if (ret > 0) | |
2617 | ret = 0; | |
1e701a32 | 2618 | kfree(range); |
f46b5a66 | 2619 | break; |
8929ecfa YZ |
2620 | default: |
2621 | ret = -EINVAL; | |
f46b5a66 | 2622 | } |
e441d54d | 2623 | out: |
25122d15 | 2624 | mnt_drop_write_file(file); |
e441d54d | 2625 | return ret; |
f46b5a66 CH |
2626 | } |
2627 | ||
2ff7e61e | 2628 | static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) |
f46b5a66 CH |
2629 | { |
2630 | struct btrfs_ioctl_vol_args *vol_args; | |
2631 | int ret; | |
2632 | ||
e441d54d CM |
2633 | if (!capable(CAP_SYS_ADMIN)) |
2634 | return -EPERM; | |
2635 | ||
171938e5 | 2636 | if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) |
e57138b3 | 2637 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
c9e9f97b | 2638 | |
0b246afa | 2639 | mutex_lock(&fs_info->volume_mutex); |
dae7b665 | 2640 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2641 | if (IS_ERR(vol_args)) { |
2642 | ret = PTR_ERR(vol_args); | |
2643 | goto out; | |
2644 | } | |
f46b5a66 | 2645 | |
5516e595 | 2646 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
2ff7e61e | 2647 | ret = btrfs_init_new_device(fs_info, vol_args->name); |
f46b5a66 | 2648 | |
43d20761 | 2649 | if (!ret) |
0b246afa | 2650 | btrfs_info(fs_info, "disk added %s", vol_args->name); |
43d20761 | 2651 | |
f46b5a66 | 2652 | kfree(vol_args); |
c9e9f97b | 2653 | out: |
0b246afa | 2654 | mutex_unlock(&fs_info->volume_mutex); |
171938e5 | 2655 | clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); |
f46b5a66 CH |
2656 | return ret; |
2657 | } | |
2658 | ||
6b526ed7 | 2659 | static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) |
f46b5a66 | 2660 | { |
0b246afa JM |
2661 | struct inode *inode = file_inode(file); |
2662 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
6b526ed7 | 2663 | struct btrfs_ioctl_vol_args_v2 *vol_args; |
f46b5a66 CH |
2664 | int ret; |
2665 | ||
e441d54d CM |
2666 | if (!capable(CAP_SYS_ADMIN)) |
2667 | return -EPERM; | |
2668 | ||
da24927b MX |
2669 | ret = mnt_want_write_file(file); |
2670 | if (ret) | |
2671 | return ret; | |
c146afad | 2672 | |
dae7b665 | 2673 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2674 | if (IS_ERR(vol_args)) { |
2675 | ret = PTR_ERR(vol_args); | |
c47ca32d | 2676 | goto err_drop; |
c9e9f97b | 2677 | } |
f46b5a66 | 2678 | |
6b526ed7 | 2679 | /* Check for compatibility reject unknown flags */ |
735654ea DS |
2680 | if (vol_args->flags & ~BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED) |
2681 | return -EOPNOTSUPP; | |
f46b5a66 | 2682 | |
171938e5 | 2683 | if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { |
183860f6 AJ |
2684 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
2685 | goto out; | |
2686 | } | |
2687 | ||
0b246afa | 2688 | mutex_lock(&fs_info->volume_mutex); |
735654ea | 2689 | if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { |
2ff7e61e | 2690 | ret = btrfs_rm_device(fs_info, NULL, vol_args->devid); |
6b526ed7 AJ |
2691 | } else { |
2692 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; | |
2ff7e61e | 2693 | ret = btrfs_rm_device(fs_info, vol_args->name, 0); |
6b526ed7 | 2694 | } |
0b246afa | 2695 | mutex_unlock(&fs_info->volume_mutex); |
171938e5 | 2696 | clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); |
183860f6 | 2697 | |
6b526ed7 | 2698 | if (!ret) { |
735654ea | 2699 | if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) |
0b246afa | 2700 | btrfs_info(fs_info, "device deleted: id %llu", |
6b526ed7 AJ |
2701 | vol_args->devid); |
2702 | else | |
0b246afa | 2703 | btrfs_info(fs_info, "device deleted: %s", |
6b526ed7 AJ |
2704 | vol_args->name); |
2705 | } | |
183860f6 AJ |
2706 | out: |
2707 | kfree(vol_args); | |
c47ca32d | 2708 | err_drop: |
4ac20c70 | 2709 | mnt_drop_write_file(file); |
f46b5a66 CH |
2710 | return ret; |
2711 | } | |
2712 | ||
da24927b | 2713 | static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) |
f46b5a66 | 2714 | { |
0b246afa JM |
2715 | struct inode *inode = file_inode(file); |
2716 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
f46b5a66 CH |
2717 | struct btrfs_ioctl_vol_args *vol_args; |
2718 | int ret; | |
2719 | ||
e441d54d CM |
2720 | if (!capable(CAP_SYS_ADMIN)) |
2721 | return -EPERM; | |
2722 | ||
da24927b MX |
2723 | ret = mnt_want_write_file(file); |
2724 | if (ret) | |
2725 | return ret; | |
c146afad | 2726 | |
171938e5 | 2727 | if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { |
183860f6 | 2728 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
58d7bbf8 DS |
2729 | goto out_drop_write; |
2730 | } | |
2731 | ||
2732 | vol_args = memdup_user(arg, sizeof(*vol_args)); | |
2733 | if (IS_ERR(vol_args)) { | |
2734 | ret = PTR_ERR(vol_args); | |
183860f6 AJ |
2735 | goto out; |
2736 | } | |
2737 | ||
58d7bbf8 | 2738 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
0b246afa | 2739 | mutex_lock(&fs_info->volume_mutex); |
2ff7e61e | 2740 | ret = btrfs_rm_device(fs_info, vol_args->name, 0); |
0b246afa | 2741 | mutex_unlock(&fs_info->volume_mutex); |
183860f6 | 2742 | |
ec95d491 | 2743 | if (!ret) |
0b246afa | 2744 | btrfs_info(fs_info, "disk deleted %s", vol_args->name); |
183860f6 | 2745 | kfree(vol_args); |
58d7bbf8 | 2746 | out: |
171938e5 | 2747 | clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); |
58d7bbf8 | 2748 | out_drop_write: |
4ac20c70 | 2749 | mnt_drop_write_file(file); |
58d7bbf8 | 2750 | |
f46b5a66 CH |
2751 | return ret; |
2752 | } | |
2753 | ||
2ff7e61e JM |
2754 | static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, |
2755 | void __user *arg) | |
475f6387 | 2756 | { |
027ed2f0 | 2757 | struct btrfs_ioctl_fs_info_args *fi_args; |
475f6387 | 2758 | struct btrfs_device *device; |
0b246afa | 2759 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
027ed2f0 | 2760 | int ret = 0; |
475f6387 | 2761 | |
027ed2f0 LZ |
2762 | fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); |
2763 | if (!fi_args) | |
2764 | return -ENOMEM; | |
2765 | ||
f7171750 | 2766 | mutex_lock(&fs_devices->device_list_mutex); |
027ed2f0 | 2767 | fi_args->num_devices = fs_devices->num_devices; |
0b246afa | 2768 | memcpy(&fi_args->fsid, fs_info->fsid, sizeof(fi_args->fsid)); |
475f6387 | 2769 | |
d7641a49 | 2770 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
027ed2f0 LZ |
2771 | if (device->devid > fi_args->max_id) |
2772 | fi_args->max_id = device->devid; | |
475f6387 JS |
2773 | } |
2774 | mutex_unlock(&fs_devices->device_list_mutex); | |
2775 | ||
bea7eafd OS |
2776 | fi_args->nodesize = fs_info->nodesize; |
2777 | fi_args->sectorsize = fs_info->sectorsize; | |
2778 | fi_args->clone_alignment = fs_info->sectorsize; | |
80a773fb | 2779 | |
027ed2f0 LZ |
2780 | if (copy_to_user(arg, fi_args, sizeof(*fi_args))) |
2781 | ret = -EFAULT; | |
475f6387 | 2782 | |
027ed2f0 LZ |
2783 | kfree(fi_args); |
2784 | return ret; | |
475f6387 JS |
2785 | } |
2786 | ||
2ff7e61e JM |
2787 | static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, |
2788 | void __user *arg) | |
475f6387 JS |
2789 | { |
2790 | struct btrfs_ioctl_dev_info_args *di_args; | |
2791 | struct btrfs_device *dev; | |
0b246afa | 2792 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
475f6387 JS |
2793 | int ret = 0; |
2794 | char *s_uuid = NULL; | |
475f6387 | 2795 | |
475f6387 JS |
2796 | di_args = memdup_user(arg, sizeof(*di_args)); |
2797 | if (IS_ERR(di_args)) | |
2798 | return PTR_ERR(di_args); | |
2799 | ||
dd5f9615 | 2800 | if (!btrfs_is_empty_uuid(di_args->uuid)) |
475f6387 JS |
2801 | s_uuid = di_args->uuid; |
2802 | ||
2803 | mutex_lock(&fs_devices->device_list_mutex); | |
0b246afa | 2804 | dev = btrfs_find_device(fs_info, di_args->devid, s_uuid, NULL); |
475f6387 JS |
2805 | |
2806 | if (!dev) { | |
2807 | ret = -ENODEV; | |
2808 | goto out; | |
2809 | } | |
2810 | ||
2811 | di_args->devid = dev->devid; | |
7cc8e58d MX |
2812 | di_args->bytes_used = btrfs_device_get_bytes_used(dev); |
2813 | di_args->total_bytes = btrfs_device_get_total_bytes(dev); | |
475f6387 | 2814 | memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); |
a27202fb | 2815 | if (dev->name) { |
606686ee JB |
2816 | struct rcu_string *name; |
2817 | ||
2818 | rcu_read_lock(); | |
2819 | name = rcu_dereference(dev->name); | |
2820 | strncpy(di_args->path, name->str, sizeof(di_args->path)); | |
2821 | rcu_read_unlock(); | |
a27202fb JM |
2822 | di_args->path[sizeof(di_args->path) - 1] = 0; |
2823 | } else { | |
99ba55ad | 2824 | di_args->path[0] = '\0'; |
a27202fb | 2825 | } |
475f6387 JS |
2826 | |
2827 | out: | |
55793c0d | 2828 | mutex_unlock(&fs_devices->device_list_mutex); |
475f6387 JS |
2829 | if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) |
2830 | ret = -EFAULT; | |
2831 | ||
2832 | kfree(di_args); | |
2833 | return ret; | |
2834 | } | |
2835 | ||
f4414602 | 2836 | static struct page *extent_same_get_page(struct inode *inode, pgoff_t index) |
416161db MF |
2837 | { |
2838 | struct page *page; | |
416161db | 2839 | |
416161db MF |
2840 | page = grab_cache_page(inode->i_mapping, index); |
2841 | if (!page) | |
31314002 | 2842 | return ERR_PTR(-ENOMEM); |
416161db MF |
2843 | |
2844 | if (!PageUptodate(page)) { | |
31314002 FM |
2845 | int ret; |
2846 | ||
2847 | ret = btrfs_readpage(NULL, page); | |
2848 | if (ret) | |
2849 | return ERR_PTR(ret); | |
416161db MF |
2850 | lock_page(page); |
2851 | if (!PageUptodate(page)) { | |
2852 | unlock_page(page); | |
09cbfeaf | 2853 | put_page(page); |
31314002 FM |
2854 | return ERR_PTR(-EIO); |
2855 | } | |
2856 | if (page->mapping != inode->i_mapping) { | |
2857 | unlock_page(page); | |
09cbfeaf | 2858 | put_page(page); |
31314002 | 2859 | return ERR_PTR(-EAGAIN); |
416161db MF |
2860 | } |
2861 | } | |
416161db MF |
2862 | |
2863 | return page; | |
2864 | } | |
2865 | ||
f4414602 MF |
2866 | static int gather_extent_pages(struct inode *inode, struct page **pages, |
2867 | int num_pages, u64 off) | |
2868 | { | |
2869 | int i; | |
09cbfeaf | 2870 | pgoff_t index = off >> PAGE_SHIFT; |
f4414602 MF |
2871 | |
2872 | for (i = 0; i < num_pages; i++) { | |
31314002 | 2873 | again: |
f4414602 | 2874 | pages[i] = extent_same_get_page(inode, index + i); |
31314002 FM |
2875 | if (IS_ERR(pages[i])) { |
2876 | int err = PTR_ERR(pages[i]); | |
2877 | ||
2878 | if (err == -EAGAIN) | |
2879 | goto again; | |
2880 | pages[i] = NULL; | |
2881 | return err; | |
2882 | } | |
f4414602 MF |
2883 | } |
2884 | return 0; | |
2885 | } | |
2886 | ||
e0bd70c6 FM |
2887 | static int lock_extent_range(struct inode *inode, u64 off, u64 len, |
2888 | bool retry_range_locking) | |
77fe20dc | 2889 | { |
e0bd70c6 FM |
2890 | /* |
2891 | * Do any pending delalloc/csum calculations on inode, one way or | |
2892 | * another, and lock file content. | |
2893 | * The locking order is: | |
2894 | * | |
2895 | * 1) pages | |
2896 | * 2) range in the inode's io tree | |
2897 | */ | |
77fe20dc MF |
2898 | while (1) { |
2899 | struct btrfs_ordered_extent *ordered; | |
2900 | lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); | |
2901 | ordered = btrfs_lookup_first_ordered_extent(inode, | |
2902 | off + len - 1); | |
ff5df9b8 FM |
2903 | if ((!ordered || |
2904 | ordered->file_offset + ordered->len <= off || | |
2905 | ordered->file_offset >= off + len) && | |
77fe20dc | 2906 | !test_range_bit(&BTRFS_I(inode)->io_tree, off, |
ff5df9b8 FM |
2907 | off + len - 1, EXTENT_DELALLOC, 0, NULL)) { |
2908 | if (ordered) | |
2909 | btrfs_put_ordered_extent(ordered); | |
77fe20dc | 2910 | break; |
ff5df9b8 | 2911 | } |
77fe20dc MF |
2912 | unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); |
2913 | if (ordered) | |
2914 | btrfs_put_ordered_extent(ordered); | |
e0bd70c6 FM |
2915 | if (!retry_range_locking) |
2916 | return -EAGAIN; | |
77fe20dc MF |
2917 | btrfs_wait_ordered_range(inode, off, len); |
2918 | } | |
e0bd70c6 | 2919 | return 0; |
77fe20dc MF |
2920 | } |
2921 | ||
f4414602 | 2922 | static void btrfs_double_inode_unlock(struct inode *inode1, struct inode *inode2) |
416161db | 2923 | { |
5955102c AV |
2924 | inode_unlock(inode1); |
2925 | inode_unlock(inode2); | |
416161db MF |
2926 | } |
2927 | ||
f4414602 MF |
2928 | static void btrfs_double_inode_lock(struct inode *inode1, struct inode *inode2) |
2929 | { | |
2930 | if (inode1 < inode2) | |
2931 | swap(inode1, inode2); | |
2932 | ||
5955102c AV |
2933 | inode_lock_nested(inode1, I_MUTEX_PARENT); |
2934 | inode_lock_nested(inode2, I_MUTEX_CHILD); | |
f4414602 MF |
2935 | } |
2936 | ||
2937 | static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1, | |
2938 | struct inode *inode2, u64 loff2, u64 len) | |
2939 | { | |
2940 | unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); | |
2941 | unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); | |
2942 | } | |
2943 | ||
e0bd70c6 FM |
2944 | static int btrfs_double_extent_lock(struct inode *inode1, u64 loff1, |
2945 | struct inode *inode2, u64 loff2, u64 len, | |
2946 | bool retry_range_locking) | |
416161db | 2947 | { |
e0bd70c6 FM |
2948 | int ret; |
2949 | ||
416161db MF |
2950 | if (inode1 < inode2) { |
2951 | swap(inode1, inode2); | |
2952 | swap(loff1, loff2); | |
2953 | } | |
e0bd70c6 FM |
2954 | ret = lock_extent_range(inode1, loff1, len, retry_range_locking); |
2955 | if (ret) | |
2956 | return ret; | |
2957 | ret = lock_extent_range(inode2, loff2, len, retry_range_locking); | |
2958 | if (ret) | |
2959 | unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, | |
2960 | loff1 + len - 1); | |
2961 | return ret; | |
f4414602 MF |
2962 | } |
2963 | ||
2964 | struct cmp_pages { | |
2965 | int num_pages; | |
2966 | struct page **src_pages; | |
2967 | struct page **dst_pages; | |
2968 | }; | |
2969 | ||
2970 | static void btrfs_cmp_data_free(struct cmp_pages *cmp) | |
2971 | { | |
2972 | int i; | |
2973 | struct page *pg; | |
2974 | ||
2975 | for (i = 0; i < cmp->num_pages; i++) { | |
2976 | pg = cmp->src_pages[i]; | |
e0bd70c6 FM |
2977 | if (pg) { |
2978 | unlock_page(pg); | |
09cbfeaf | 2979 | put_page(pg); |
e0bd70c6 | 2980 | } |
f4414602 | 2981 | pg = cmp->dst_pages[i]; |
e0bd70c6 FM |
2982 | if (pg) { |
2983 | unlock_page(pg); | |
09cbfeaf | 2984 | put_page(pg); |
e0bd70c6 | 2985 | } |
f4414602 MF |
2986 | } |
2987 | kfree(cmp->src_pages); | |
2988 | kfree(cmp->dst_pages); | |
2989 | } | |
2990 | ||
2991 | static int btrfs_cmp_data_prepare(struct inode *src, u64 loff, | |
2992 | struct inode *dst, u64 dst_loff, | |
2993 | u64 len, struct cmp_pages *cmp) | |
2994 | { | |
2995 | int ret; | |
09cbfeaf | 2996 | int num_pages = PAGE_ALIGN(len) >> PAGE_SHIFT; |
f4414602 MF |
2997 | struct page **src_pgarr, **dst_pgarr; |
2998 | ||
2999 | /* | |
3000 | * We must gather up all the pages before we initiate our | |
3001 | * extent locking. We use an array for the page pointers. Size | |
3002 | * of the array is bounded by len, which is in turn bounded by | |
3003 | * BTRFS_MAX_DEDUPE_LEN. | |
3004 | */ | |
66722f7c DS |
3005 | src_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL); |
3006 | dst_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL); | |
f4414602 MF |
3007 | if (!src_pgarr || !dst_pgarr) { |
3008 | kfree(src_pgarr); | |
3009 | kfree(dst_pgarr); | |
3010 | return -ENOMEM; | |
416161db | 3011 | } |
f4414602 MF |
3012 | cmp->num_pages = num_pages; |
3013 | cmp->src_pages = src_pgarr; | |
3014 | cmp->dst_pages = dst_pgarr; | |
3015 | ||
b1517622 FM |
3016 | /* |
3017 | * If deduping ranges in the same inode, locking rules make it mandatory | |
3018 | * to always lock pages in ascending order to avoid deadlocks with | |
3019 | * concurrent tasks (such as starting writeback/delalloc). | |
3020 | */ | |
3021 | if (src == dst && dst_loff < loff) { | |
3022 | swap(src_pgarr, dst_pgarr); | |
3023 | swap(loff, dst_loff); | |
3024 | } | |
3025 | ||
3026 | ret = gather_extent_pages(src, src_pgarr, cmp->num_pages, loff); | |
f4414602 MF |
3027 | if (ret) |
3028 | goto out; | |
3029 | ||
b1517622 | 3030 | ret = gather_extent_pages(dst, dst_pgarr, cmp->num_pages, dst_loff); |
f4414602 MF |
3031 | |
3032 | out: | |
3033 | if (ret) | |
3034 | btrfs_cmp_data_free(cmp); | |
78ad4ce0 | 3035 | return ret; |
416161db MF |
3036 | } |
3037 | ||
1a287cfe | 3038 | static int btrfs_cmp_data(u64 len, struct cmp_pages *cmp) |
416161db MF |
3039 | { |
3040 | int ret = 0; | |
f4414602 | 3041 | int i; |
416161db | 3042 | struct page *src_page, *dst_page; |
09cbfeaf | 3043 | unsigned int cmp_len = PAGE_SIZE; |
416161db MF |
3044 | void *addr, *dst_addr; |
3045 | ||
f4414602 | 3046 | i = 0; |
416161db | 3047 | while (len) { |
09cbfeaf | 3048 | if (len < PAGE_SIZE) |
416161db MF |
3049 | cmp_len = len; |
3050 | ||
f4414602 MF |
3051 | BUG_ON(i >= cmp->num_pages); |
3052 | ||
3053 | src_page = cmp->src_pages[i]; | |
3054 | dst_page = cmp->dst_pages[i]; | |
e0bd70c6 FM |
3055 | ASSERT(PageLocked(src_page)); |
3056 | ASSERT(PageLocked(dst_page)); | |
f4414602 | 3057 | |
416161db MF |
3058 | addr = kmap_atomic(src_page); |
3059 | dst_addr = kmap_atomic(dst_page); | |
3060 | ||
3061 | flush_dcache_page(src_page); | |
3062 | flush_dcache_page(dst_page); | |
3063 | ||
3064 | if (memcmp(addr, dst_addr, cmp_len)) | |
2b3909f8 | 3065 | ret = -EBADE; |
416161db MF |
3066 | |
3067 | kunmap_atomic(addr); | |
3068 | kunmap_atomic(dst_addr); | |
416161db MF |
3069 | |
3070 | if (ret) | |
3071 | break; | |
3072 | ||
416161db | 3073 | len -= cmp_len; |
f4414602 | 3074 | i++; |
416161db MF |
3075 | } |
3076 | ||
3077 | return ret; | |
3078 | } | |
3079 | ||
e1d227a4 MF |
3080 | static int extent_same_check_offsets(struct inode *inode, u64 off, u64 *plen, |
3081 | u64 olen) | |
416161db | 3082 | { |
e1d227a4 | 3083 | u64 len = *plen; |
416161db MF |
3084 | u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; |
3085 | ||
e1d227a4 | 3086 | if (off + olen > inode->i_size || off + olen < off) |
416161db | 3087 | return -EINVAL; |
e1d227a4 MF |
3088 | |
3089 | /* if we extend to eof, continue to block boundary */ | |
3090 | if (off + len == inode->i_size) | |
3091 | *plen = len = ALIGN(inode->i_size, bs) - off; | |
3092 | ||
416161db MF |
3093 | /* Check that we are block aligned - btrfs_clone() requires this */ |
3094 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) | |
3095 | return -EINVAL; | |
3096 | ||
3097 | return 0; | |
3098 | } | |
3099 | ||
e1d227a4 | 3100 | static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, |
416161db MF |
3101 | struct inode *dst, u64 dst_loff) |
3102 | { | |
3103 | int ret; | |
e1d227a4 | 3104 | u64 len = olen; |
f4414602 | 3105 | struct cmp_pages cmp; |
fc4badd9 | 3106 | bool same_inode = (src == dst); |
0efa9f48 MF |
3107 | u64 same_lock_start = 0; |
3108 | u64 same_lock_len = 0; | |
416161db | 3109 | |
113e8283 FM |
3110 | if (len == 0) |
3111 | return 0; | |
3112 | ||
fc4badd9 | 3113 | if (same_inode) |
5955102c | 3114 | inode_lock(src); |
fc4badd9 OS |
3115 | else |
3116 | btrfs_double_inode_lock(src, dst); | |
416161db | 3117 | |
fc4badd9 OS |
3118 | ret = extent_same_check_offsets(src, loff, &len, olen); |
3119 | if (ret) | |
3120 | goto out_unlock; | |
416161db | 3121 | |
fc4badd9 OS |
3122 | ret = extent_same_check_offsets(dst, dst_loff, &len, olen); |
3123 | if (ret) | |
3124 | goto out_unlock; | |
3125 | ||
3126 | if (same_inode) { | |
0efa9f48 MF |
3127 | /* |
3128 | * Single inode case wants the same checks, except we | |
3129 | * don't want our length pushed out past i_size as | |
3130 | * comparing that data range makes no sense. | |
3131 | * | |
3132 | * extent_same_check_offsets() will do this for an | |
3133 | * unaligned length at i_size, so catch it here and | |
3134 | * reject the request. | |
3135 | * | |
3136 | * This effectively means we require aligned extents | |
3137 | * for the single-inode case, whereas the other cases | |
3138 | * allow an unaligned length so long as it ends at | |
3139 | * i_size. | |
3140 | */ | |
3141 | if (len != olen) { | |
3142 | ret = -EINVAL; | |
3143 | goto out_unlock; | |
3144 | } | |
3145 | ||
3146 | /* Check for overlapping ranges */ | |
3147 | if (dst_loff + len > loff && dst_loff < loff + len) { | |
3148 | ret = -EINVAL; | |
3149 | goto out_unlock; | |
3150 | } | |
3151 | ||
3152 | same_lock_start = min_t(u64, loff, dst_loff); | |
3153 | same_lock_len = max_t(u64, loff, dst_loff) + len - same_lock_start; | |
0efa9f48 | 3154 | } |
416161db MF |
3155 | |
3156 | /* don't make the dst file partly checksummed */ | |
3157 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != | |
3158 | (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { | |
3159 | ret = -EINVAL; | |
3160 | goto out_unlock; | |
3161 | } | |
3162 | ||
e0bd70c6 | 3163 | again: |
f4414602 MF |
3164 | ret = btrfs_cmp_data_prepare(src, loff, dst, dst_loff, olen, &cmp); |
3165 | if (ret) | |
3166 | goto out_unlock; | |
3167 | ||
0efa9f48 | 3168 | if (same_inode) |
e0bd70c6 FM |
3169 | ret = lock_extent_range(src, same_lock_start, same_lock_len, |
3170 | false); | |
0efa9f48 | 3171 | else |
e0bd70c6 FM |
3172 | ret = btrfs_double_extent_lock(src, loff, dst, dst_loff, len, |
3173 | false); | |
3174 | /* | |
3175 | * If one of the inodes has dirty pages in the respective range or | |
3176 | * ordered extents, we need to flush dellaloc and wait for all ordered | |
3177 | * extents in the range. We must unlock the pages and the ranges in the | |
3178 | * io trees to avoid deadlocks when flushing delalloc (requires locking | |
3179 | * pages) and when waiting for ordered extents to complete (they require | |
3180 | * range locking). | |
3181 | */ | |
3182 | if (ret == -EAGAIN) { | |
3183 | /* | |
3184 | * Ranges in the io trees already unlocked. Now unlock all | |
3185 | * pages before waiting for all IO to complete. | |
3186 | */ | |
3187 | btrfs_cmp_data_free(&cmp); | |
3188 | if (same_inode) { | |
3189 | btrfs_wait_ordered_range(src, same_lock_start, | |
3190 | same_lock_len); | |
3191 | } else { | |
3192 | btrfs_wait_ordered_range(src, loff, len); | |
3193 | btrfs_wait_ordered_range(dst, dst_loff, len); | |
3194 | } | |
3195 | goto again; | |
3196 | } | |
3197 | ASSERT(ret == 0); | |
3198 | if (WARN_ON(ret)) { | |
3199 | /* ranges in the io trees already unlocked */ | |
3200 | btrfs_cmp_data_free(&cmp); | |
3201 | return ret; | |
3202 | } | |
f4414602 | 3203 | |
207910dd | 3204 | /* pass original length for comparison so we stay within i_size */ |
1a287cfe | 3205 | ret = btrfs_cmp_data(olen, &cmp); |
416161db | 3206 | if (ret == 0) |
1c919a5e | 3207 | ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1); |
416161db | 3208 | |
0efa9f48 MF |
3209 | if (same_inode) |
3210 | unlock_extent(&BTRFS_I(src)->io_tree, same_lock_start, | |
3211 | same_lock_start + same_lock_len - 1); | |
3212 | else | |
3213 | btrfs_double_extent_unlock(src, loff, dst, dst_loff, len); | |
f4414602 MF |
3214 | |
3215 | btrfs_cmp_data_free(&cmp); | |
416161db | 3216 | out_unlock: |
0efa9f48 | 3217 | if (same_inode) |
5955102c | 3218 | inode_unlock(src); |
0efa9f48 MF |
3219 | else |
3220 | btrfs_double_inode_unlock(src, dst); | |
416161db MF |
3221 | |
3222 | return ret; | |
3223 | } | |
3224 | ||
ee22184b | 3225 | #define BTRFS_MAX_DEDUPE_LEN SZ_16M |
416161db | 3226 | |
2b3909f8 DW |
3227 | ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen, |
3228 | struct file *dst_file, u64 dst_loff) | |
416161db | 3229 | { |
2b3909f8 DW |
3230 | struct inode *src = file_inode(src_file); |
3231 | struct inode *dst = file_inode(dst_file); | |
416161db | 3232 | u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; |
2b3909f8 | 3233 | ssize_t res; |
416161db | 3234 | |
2b3909f8 DW |
3235 | if (olen > BTRFS_MAX_DEDUPE_LEN) |
3236 | olen = BTRFS_MAX_DEDUPE_LEN; | |
416161db | 3237 | |
09cbfeaf | 3238 | if (WARN_ON_ONCE(bs < PAGE_SIZE)) { |
416161db MF |
3239 | /* |
3240 | * Btrfs does not support blocksize < page_size. As a | |
3241 | * result, btrfs_cmp_data() won't correctly handle | |
3242 | * this situation without an update. | |
3243 | */ | |
2b3909f8 | 3244 | return -EINVAL; |
416161db MF |
3245 | } |
3246 | ||
2b3909f8 DW |
3247 | res = btrfs_extent_same(src, loff, olen, dst, dst_loff); |
3248 | if (res) | |
3249 | return res; | |
3250 | return olen; | |
416161db MF |
3251 | } |
3252 | ||
f82a9901 FM |
3253 | static int clone_finish_inode_update(struct btrfs_trans_handle *trans, |
3254 | struct inode *inode, | |
3255 | u64 endoff, | |
3256 | const u64 destoff, | |
1c919a5e MF |
3257 | const u64 olen, |
3258 | int no_time_update) | |
f82a9901 FM |
3259 | { |
3260 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3261 | int ret; | |
3262 | ||
3263 | inode_inc_iversion(inode); | |
1c919a5e | 3264 | if (!no_time_update) |
c2050a45 | 3265 | inode->i_mtime = inode->i_ctime = current_time(inode); |
f82a9901 FM |
3266 | /* |
3267 | * We round up to the block size at eof when determining which | |
3268 | * extents to clone above, but shouldn't round up the file size. | |
3269 | */ | |
3270 | if (endoff > destoff + olen) | |
3271 | endoff = destoff + olen; | |
3272 | if (endoff > inode->i_size) | |
6ef06d27 | 3273 | btrfs_i_size_write(BTRFS_I(inode), endoff); |
f82a9901 FM |
3274 | |
3275 | ret = btrfs_update_inode(trans, root, inode); | |
3276 | if (ret) { | |
66642832 | 3277 | btrfs_abort_transaction(trans, ret); |
3a45bb20 | 3278 | btrfs_end_transaction(trans); |
f82a9901 FM |
3279 | goto out; |
3280 | } | |
3a45bb20 | 3281 | ret = btrfs_end_transaction(trans); |
f82a9901 FM |
3282 | out: |
3283 | return ret; | |
3284 | } | |
3285 | ||
a2f392e4 | 3286 | static void clone_update_extent_map(struct btrfs_inode *inode, |
7ffbb598 FM |
3287 | const struct btrfs_trans_handle *trans, |
3288 | const struct btrfs_path *path, | |
7ffbb598 FM |
3289 | const u64 hole_offset, |
3290 | const u64 hole_len) | |
3291 | { | |
a2f392e4 | 3292 | struct extent_map_tree *em_tree = &inode->extent_tree; |
7ffbb598 FM |
3293 | struct extent_map *em; |
3294 | int ret; | |
3295 | ||
3296 | em = alloc_extent_map(); | |
3297 | if (!em) { | |
a2f392e4 | 3298 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags); |
7ffbb598 FM |
3299 | return; |
3300 | } | |
3301 | ||
14f59796 FM |
3302 | if (path) { |
3303 | struct btrfs_file_extent_item *fi; | |
3304 | ||
3305 | fi = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3306 | struct btrfs_file_extent_item); | |
a2f392e4 | 3307 | btrfs_extent_item_to_extent_map(inode, path, fi, false, em); |
7ffbb598 FM |
3308 | em->generation = -1; |
3309 | if (btrfs_file_extent_type(path->nodes[0], fi) == | |
3310 | BTRFS_FILE_EXTENT_INLINE) | |
3311 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
a2f392e4 | 3312 | &inode->runtime_flags); |
7ffbb598 FM |
3313 | } else { |
3314 | em->start = hole_offset; | |
3315 | em->len = hole_len; | |
3316 | em->ram_bytes = em->len; | |
3317 | em->orig_start = hole_offset; | |
3318 | em->block_start = EXTENT_MAP_HOLE; | |
3319 | em->block_len = 0; | |
3320 | em->orig_block_len = 0; | |
3321 | em->compress_type = BTRFS_COMPRESS_NONE; | |
3322 | em->generation = trans->transid; | |
3323 | } | |
3324 | ||
3325 | while (1) { | |
3326 | write_lock(&em_tree->lock); | |
3327 | ret = add_extent_mapping(em_tree, em, 1); | |
3328 | write_unlock(&em_tree->lock); | |
3329 | if (ret != -EEXIST) { | |
3330 | free_extent_map(em); | |
3331 | break; | |
3332 | } | |
a2f392e4 | 3333 | btrfs_drop_extent_cache(inode, em->start, |
7ffbb598 FM |
3334 | em->start + em->len - 1, 0); |
3335 | } | |
3336 | ||
ee39b432 | 3337 | if (ret) |
a2f392e4 | 3338 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags); |
7ffbb598 FM |
3339 | } |
3340 | ||
8039d87d FM |
3341 | /* |
3342 | * Make sure we do not end up inserting an inline extent into a file that has | |
3343 | * already other (non-inline) extents. If a file has an inline extent it can | |
3344 | * not have any other extents and the (single) inline extent must start at the | |
3345 | * file offset 0. Failing to respect these rules will lead to file corruption, | |
3346 | * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc | |
3347 | * | |
3348 | * We can have extents that have been already written to disk or we can have | |
3349 | * dirty ranges still in delalloc, in which case the extent maps and items are | |
3350 | * created only when we run delalloc, and the delalloc ranges might fall outside | |
3351 | * the range we are currently locking in the inode's io tree. So we check the | |
3352 | * inode's i_size because of that (i_size updates are done while holding the | |
3353 | * i_mutex, which we are holding here). | |
3354 | * We also check to see if the inode has a size not greater than "datal" but has | |
3355 | * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are | |
3356 | * protected against such concurrent fallocate calls by the i_mutex). | |
3357 | * | |
3358 | * If the file has no extents but a size greater than datal, do not allow the | |
3359 | * copy because we would need turn the inline extent into a non-inline one (even | |
3360 | * with NO_HOLES enabled). If we find our destination inode only has one inline | |
3361 | * extent, just overwrite it with the source inline extent if its size is less | |
3362 | * than the source extent's size, or we could copy the source inline extent's | |
3363 | * data into the destination inode's inline extent if the later is greater then | |
3364 | * the former. | |
3365 | */ | |
4a0ab9d7 | 3366 | static int clone_copy_inline_extent(struct inode *dst, |
8039d87d FM |
3367 | struct btrfs_trans_handle *trans, |
3368 | struct btrfs_path *path, | |
3369 | struct btrfs_key *new_key, | |
3370 | const u64 drop_start, | |
3371 | const u64 datal, | |
3372 | const u64 skip, | |
3373 | const u64 size, | |
3374 | char *inline_data) | |
3375 | { | |
0b246afa | 3376 | struct btrfs_fs_info *fs_info = btrfs_sb(dst->i_sb); |
8039d87d FM |
3377 | struct btrfs_root *root = BTRFS_I(dst)->root; |
3378 | const u64 aligned_end = ALIGN(new_key->offset + datal, | |
0b246afa | 3379 | fs_info->sectorsize); |
8039d87d FM |
3380 | int ret; |
3381 | struct btrfs_key key; | |
3382 | ||
3383 | if (new_key->offset > 0) | |
3384 | return -EOPNOTSUPP; | |
3385 | ||
4a0cc7ca | 3386 | key.objectid = btrfs_ino(BTRFS_I(dst)); |
8039d87d FM |
3387 | key.type = BTRFS_EXTENT_DATA_KEY; |
3388 | key.offset = 0; | |
3389 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3390 | if (ret < 0) { | |
3391 | return ret; | |
3392 | } else if (ret > 0) { | |
3393 | if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) { | |
3394 | ret = btrfs_next_leaf(root, path); | |
3395 | if (ret < 0) | |
3396 | return ret; | |
3397 | else if (ret > 0) | |
3398 | goto copy_inline_extent; | |
3399 | } | |
3400 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
4a0cc7ca | 3401 | if (key.objectid == btrfs_ino(BTRFS_I(dst)) && |
8039d87d FM |
3402 | key.type == BTRFS_EXTENT_DATA_KEY) { |
3403 | ASSERT(key.offset > 0); | |
3404 | return -EOPNOTSUPP; | |
3405 | } | |
3406 | } else if (i_size_read(dst) <= datal) { | |
3407 | struct btrfs_file_extent_item *ei; | |
3408 | u64 ext_len; | |
3409 | ||
3410 | /* | |
3411 | * If the file size is <= datal, make sure there are no other | |
3412 | * extents following (can happen do to an fallocate call with | |
3413 | * the flag FALLOC_FL_KEEP_SIZE). | |
3414 | */ | |
3415 | ei = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3416 | struct btrfs_file_extent_item); | |
3417 | /* | |
3418 | * If it's an inline extent, it can not have other extents | |
3419 | * following it. | |
3420 | */ | |
3421 | if (btrfs_file_extent_type(path->nodes[0], ei) == | |
3422 | BTRFS_FILE_EXTENT_INLINE) | |
3423 | goto copy_inline_extent; | |
3424 | ||
3425 | ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei); | |
3426 | if (ext_len > aligned_end) | |
3427 | return -EOPNOTSUPP; | |
3428 | ||
3429 | ret = btrfs_next_item(root, path); | |
3430 | if (ret < 0) { | |
3431 | return ret; | |
3432 | } else if (ret == 0) { | |
3433 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
3434 | path->slots[0]); | |
4a0cc7ca | 3435 | if (key.objectid == btrfs_ino(BTRFS_I(dst)) && |
8039d87d FM |
3436 | key.type == BTRFS_EXTENT_DATA_KEY) |
3437 | return -EOPNOTSUPP; | |
3438 | } | |
3439 | } | |
3440 | ||
3441 | copy_inline_extent: | |
3442 | /* | |
3443 | * We have no extent items, or we have an extent at offset 0 which may | |
3444 | * or may not be inlined. All these cases are dealt the same way. | |
3445 | */ | |
3446 | if (i_size_read(dst) > datal) { | |
3447 | /* | |
3448 | * If the destination inode has an inline extent... | |
3449 | * This would require copying the data from the source inline | |
3450 | * extent into the beginning of the destination's inline extent. | |
3451 | * But this is really complex, both extents can be compressed | |
3452 | * or just one of them, which would require decompressing and | |
3453 | * re-compressing data (which could increase the new compressed | |
3454 | * size, not allowing the compressed data to fit anymore in an | |
3455 | * inline extent). | |
3456 | * So just don't support this case for now (it should be rare, | |
3457 | * we are not really saving space when cloning inline extents). | |
3458 | */ | |
3459 | return -EOPNOTSUPP; | |
3460 | } | |
3461 | ||
3462 | btrfs_release_path(path); | |
3463 | ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1); | |
3464 | if (ret) | |
3465 | return ret; | |
3466 | ret = btrfs_insert_empty_item(trans, root, path, new_key, size); | |
3467 | if (ret) | |
3468 | return ret; | |
3469 | ||
3470 | if (skip) { | |
3471 | const u32 start = btrfs_file_extent_calc_inline_size(0); | |
3472 | ||
3473 | memmove(inline_data + start, inline_data + start + skip, datal); | |
3474 | } | |
3475 | ||
3476 | write_extent_buffer(path->nodes[0], inline_data, | |
3477 | btrfs_item_ptr_offset(path->nodes[0], | |
3478 | path->slots[0]), | |
3479 | size); | |
3480 | inode_add_bytes(dst, datal); | |
3481 | ||
3482 | return 0; | |
3483 | } | |
3484 | ||
32b7c687 MF |
3485 | /** |
3486 | * btrfs_clone() - clone a range from inode file to another | |
3487 | * | |
3488 | * @src: Inode to clone from | |
3489 | * @inode: Inode to clone to | |
3490 | * @off: Offset within source to start clone from | |
3491 | * @olen: Original length, passed by user, of range to clone | |
1c919a5e | 3492 | * @olen_aligned: Block-aligned value of olen |
32b7c687 | 3493 | * @destoff: Offset within @inode to start clone |
1c919a5e | 3494 | * @no_time_update: Whether to update mtime/ctime on the target inode |
32b7c687 MF |
3495 | */ |
3496 | static int btrfs_clone(struct inode *src, struct inode *inode, | |
f82a9901 | 3497 | const u64 off, const u64 olen, const u64 olen_aligned, |
1c919a5e | 3498 | const u64 destoff, int no_time_update) |
f46b5a66 | 3499 | { |
0b246afa | 3500 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
f46b5a66 | 3501 | struct btrfs_root *root = BTRFS_I(inode)->root; |
32b7c687 | 3502 | struct btrfs_path *path = NULL; |
f46b5a66 | 3503 | struct extent_buffer *leaf; |
32b7c687 MF |
3504 | struct btrfs_trans_handle *trans; |
3505 | char *buf = NULL; | |
ae01a0ab | 3506 | struct btrfs_key key; |
f46b5a66 CH |
3507 | u32 nritems; |
3508 | int slot; | |
ae01a0ab | 3509 | int ret; |
f82a9901 | 3510 | const u64 len = olen_aligned; |
f82a9901 | 3511 | u64 last_dest_end = destoff; |
ae01a0ab YZ |
3512 | |
3513 | ret = -ENOMEM; | |
752ade68 MH |
3514 | buf = kvmalloc(fs_info->nodesize, GFP_KERNEL); |
3515 | if (!buf) | |
3516 | return ret; | |
ae01a0ab YZ |
3517 | |
3518 | path = btrfs_alloc_path(); | |
3519 | if (!path) { | |
15351955 | 3520 | kvfree(buf); |
32b7c687 | 3521 | return ret; |
d525e8ab LZ |
3522 | } |
3523 | ||
e4058b54 | 3524 | path->reada = READA_FORWARD; |
c5c9cd4d | 3525 | /* clone data */ |
4a0cc7ca | 3526 | key.objectid = btrfs_ino(BTRFS_I(src)); |
ae01a0ab | 3527 | key.type = BTRFS_EXTENT_DATA_KEY; |
2c463823 | 3528 | key.offset = off; |
f46b5a66 CH |
3529 | |
3530 | while (1) { | |
de249e66 | 3531 | u64 next_key_min_offset = key.offset + 1; |
df858e76 | 3532 | |
f46b5a66 CH |
3533 | /* |
3534 | * note the key will change type as we walk through the | |
3535 | * tree. | |
3536 | */ | |
e4355f34 | 3537 | path->leave_spinning = 1; |
362a20c5 DS |
3538 | ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, |
3539 | 0, 0); | |
f46b5a66 CH |
3540 | if (ret < 0) |
3541 | goto out; | |
2c463823 FM |
3542 | /* |
3543 | * First search, if no extent item that starts at offset off was | |
3544 | * found but the previous item is an extent item, it's possible | |
3545 | * it might overlap our target range, therefore process it. | |
3546 | */ | |
3547 | if (key.offset == off && ret > 0 && path->slots[0] > 0) { | |
3548 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
3549 | path->slots[0] - 1); | |
3550 | if (key.type == BTRFS_EXTENT_DATA_KEY) | |
3551 | path->slots[0]--; | |
3552 | } | |
f46b5a66 | 3553 | |
ae01a0ab | 3554 | nritems = btrfs_header_nritems(path->nodes[0]); |
e4355f34 | 3555 | process_slot: |
ae01a0ab | 3556 | if (path->slots[0] >= nritems) { |
362a20c5 | 3557 | ret = btrfs_next_leaf(BTRFS_I(src)->root, path); |
f46b5a66 CH |
3558 | if (ret < 0) |
3559 | goto out; | |
3560 | if (ret > 0) | |
3561 | break; | |
ae01a0ab | 3562 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
3563 | } |
3564 | leaf = path->nodes[0]; | |
3565 | slot = path->slots[0]; | |
f46b5a66 | 3566 | |
ae01a0ab | 3567 | btrfs_item_key_to_cpu(leaf, &key, slot); |
962a298f | 3568 | if (key.type > BTRFS_EXTENT_DATA_KEY || |
4a0cc7ca | 3569 | key.objectid != btrfs_ino(BTRFS_I(src))) |
f46b5a66 CH |
3570 | break; |
3571 | ||
962a298f | 3572 | if (key.type == BTRFS_EXTENT_DATA_KEY) { |
c5c9cd4d SW |
3573 | struct btrfs_file_extent_item *extent; |
3574 | int type; | |
31840ae1 ZY |
3575 | u32 size; |
3576 | struct btrfs_key new_key; | |
c5c9cd4d SW |
3577 | u64 disko = 0, diskl = 0; |
3578 | u64 datao = 0, datal = 0; | |
3579 | u8 comp; | |
f82a9901 | 3580 | u64 drop_start; |
31840ae1 | 3581 | |
c5c9cd4d SW |
3582 | extent = btrfs_item_ptr(leaf, slot, |
3583 | struct btrfs_file_extent_item); | |
3584 | comp = btrfs_file_extent_compression(leaf, extent); | |
3585 | type = btrfs_file_extent_type(leaf, extent); | |
c8a894d7 CM |
3586 | if (type == BTRFS_FILE_EXTENT_REG || |
3587 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d397712b CM |
3588 | disko = btrfs_file_extent_disk_bytenr(leaf, |
3589 | extent); | |
3590 | diskl = btrfs_file_extent_disk_num_bytes(leaf, | |
3591 | extent); | |
c5c9cd4d | 3592 | datao = btrfs_file_extent_offset(leaf, extent); |
d397712b CM |
3593 | datal = btrfs_file_extent_num_bytes(leaf, |
3594 | extent); | |
c5c9cd4d SW |
3595 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
3596 | /* take upper bound, may be compressed */ | |
3597 | datal = btrfs_file_extent_ram_bytes(leaf, | |
3598 | extent); | |
3599 | } | |
31840ae1 | 3600 | |
2c463823 FM |
3601 | /* |
3602 | * The first search might have left us at an extent | |
3603 | * item that ends before our target range's start, can | |
3604 | * happen if we have holes and NO_HOLES feature enabled. | |
3605 | */ | |
3606 | if (key.offset + datal <= off) { | |
e4355f34 FDBM |
3607 | path->slots[0]++; |
3608 | goto process_slot; | |
2c463823 FM |
3609 | } else if (key.offset >= off + len) { |
3610 | break; | |
e4355f34 | 3611 | } |
df858e76 | 3612 | next_key_min_offset = key.offset + datal; |
e4355f34 FDBM |
3613 | size = btrfs_item_size_nr(leaf, slot); |
3614 | read_extent_buffer(leaf, buf, | |
3615 | btrfs_item_ptr_offset(leaf, slot), | |
3616 | size); | |
3617 | ||
3618 | btrfs_release_path(path); | |
3619 | path->leave_spinning = 0; | |
c5c9cd4d | 3620 | |
31840ae1 | 3621 | memcpy(&new_key, &key, sizeof(new_key)); |
4a0cc7ca | 3622 | new_key.objectid = btrfs_ino(BTRFS_I(inode)); |
4d728ec7 LZ |
3623 | if (off <= key.offset) |
3624 | new_key.offset = key.offset + destoff - off; | |
3625 | else | |
3626 | new_key.offset = destoff; | |
31840ae1 | 3627 | |
f82a9901 FM |
3628 | /* |
3629 | * Deal with a hole that doesn't have an extent item | |
3630 | * that represents it (NO_HOLES feature enabled). | |
3631 | * This hole is either in the middle of the cloning | |
3632 | * range or at the beginning (fully overlaps it or | |
3633 | * partially overlaps it). | |
3634 | */ | |
3635 | if (new_key.offset != last_dest_end) | |
3636 | drop_start = last_dest_end; | |
3637 | else | |
3638 | drop_start = new_key.offset; | |
3639 | ||
b6f3409b SW |
3640 | /* |
3641 | * 1 - adjusting old extent (we may have to split it) | |
3642 | * 1 - add new extent | |
3643 | * 1 - inode update | |
3644 | */ | |
3645 | trans = btrfs_start_transaction(root, 3); | |
a22285a6 YZ |
3646 | if (IS_ERR(trans)) { |
3647 | ret = PTR_ERR(trans); | |
3648 | goto out; | |
3649 | } | |
3650 | ||
c8a894d7 CM |
3651 | if (type == BTRFS_FILE_EXTENT_REG || |
3652 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d72c0842 LZ |
3653 | /* |
3654 | * a | --- range to clone ---| b | |
3655 | * | ------------- extent ------------- | | |
3656 | */ | |
3657 | ||
93915584 | 3658 | /* subtract range b */ |
d72c0842 LZ |
3659 | if (key.offset + datal > off + len) |
3660 | datal = off + len - key.offset; | |
3661 | ||
93915584 | 3662 | /* subtract range a */ |
a22285a6 YZ |
3663 | if (off > key.offset) { |
3664 | datao += off - key.offset; | |
3665 | datal -= off - key.offset; | |
3666 | } | |
3667 | ||
5dc562c5 | 3668 | ret = btrfs_drop_extents(trans, root, inode, |
f82a9901 | 3669 | drop_start, |
a22285a6 | 3670 | new_key.offset + datal, |
2671485d | 3671 | 1); |
79787eaa | 3672 | if (ret) { |
3f9e3df8 | 3673 | if (ret != -EOPNOTSUPP) |
00fdf13a | 3674 | btrfs_abort_transaction(trans, |
66642832 | 3675 | ret); |
3a45bb20 | 3676 | btrfs_end_transaction(trans); |
79787eaa JM |
3677 | goto out; |
3678 | } | |
a22285a6 | 3679 | |
c5c9cd4d SW |
3680 | ret = btrfs_insert_empty_item(trans, root, path, |
3681 | &new_key, size); | |
79787eaa | 3682 | if (ret) { |
66642832 | 3683 | btrfs_abort_transaction(trans, ret); |
3a45bb20 | 3684 | btrfs_end_transaction(trans); |
79787eaa JM |
3685 | goto out; |
3686 | } | |
c5c9cd4d SW |
3687 | |
3688 | leaf = path->nodes[0]; | |
3689 | slot = path->slots[0]; | |
3690 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
3691 | btrfs_item_ptr_offset(leaf, slot), |
3692 | size); | |
ae01a0ab | 3693 | |
c5c9cd4d | 3694 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 3695 | struct btrfs_file_extent_item); |
c5c9cd4d | 3696 | |
c5c9cd4d SW |
3697 | /* disko == 0 means it's a hole */ |
3698 | if (!disko) | |
3699 | datao = 0; | |
c5c9cd4d SW |
3700 | |
3701 | btrfs_set_file_extent_offset(leaf, extent, | |
3702 | datao); | |
3703 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
3704 | datal); | |
fcebe456 | 3705 | |
c5c9cd4d SW |
3706 | if (disko) { |
3707 | inode_add_bytes(inode, datal); | |
2ff7e61e JM |
3708 | ret = btrfs_inc_extent_ref(trans, |
3709 | fs_info, | |
5d4f98a2 YZ |
3710 | disko, diskl, 0, |
3711 | root->root_key.objectid, | |
4a0cc7ca | 3712 | btrfs_ino(BTRFS_I(inode)), |
b06c4bf5 | 3713 | new_key.offset - datao); |
79787eaa JM |
3714 | if (ret) { |
3715 | btrfs_abort_transaction(trans, | |
79787eaa | 3716 | ret); |
3a45bb20 | 3717 | btrfs_end_transaction(trans); |
79787eaa JM |
3718 | goto out; |
3719 | ||
3720 | } | |
f46b5a66 | 3721 | } |
c5c9cd4d SW |
3722 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
3723 | u64 skip = 0; | |
3724 | u64 trim = 0; | |
ed958762 | 3725 | |
c5c9cd4d SW |
3726 | if (off > key.offset) { |
3727 | skip = off - key.offset; | |
3728 | new_key.offset += skip; | |
3729 | } | |
d397712b | 3730 | |
aa42ffd9 LB |
3731 | if (key.offset + datal > off + len) |
3732 | trim = key.offset + datal - (off + len); | |
d397712b | 3733 | |
c5c9cd4d | 3734 | if (comp && (skip || trim)) { |
c5c9cd4d | 3735 | ret = -EINVAL; |
3a45bb20 | 3736 | btrfs_end_transaction(trans); |
c5c9cd4d SW |
3737 | goto out; |
3738 | } | |
3739 | size -= skip + trim; | |
3740 | datal -= skip + trim; | |
a22285a6 | 3741 | |
4a0ab9d7 | 3742 | ret = clone_copy_inline_extent(inode, |
8039d87d FM |
3743 | trans, path, |
3744 | &new_key, | |
3745 | drop_start, | |
3746 | datal, | |
3747 | skip, size, buf); | |
79787eaa | 3748 | if (ret) { |
3f9e3df8 | 3749 | if (ret != -EOPNOTSUPP) |
3a29bc09 | 3750 | btrfs_abort_transaction(trans, |
8039d87d | 3751 | ret); |
3a45bb20 | 3752 | btrfs_end_transaction(trans); |
79787eaa JM |
3753 | goto out; |
3754 | } | |
c5c9cd4d SW |
3755 | leaf = path->nodes[0]; |
3756 | slot = path->slots[0]; | |
f46b5a66 | 3757 | } |
c5c9cd4d | 3758 | |
7ffbb598 FM |
3759 | /* If we have an implicit hole (NO_HOLES feature). */ |
3760 | if (drop_start < new_key.offset) | |
a2f392e4 | 3761 | clone_update_extent_map(BTRFS_I(inode), trans, |
14f59796 | 3762 | NULL, drop_start, |
7ffbb598 FM |
3763 | new_key.offset - drop_start); |
3764 | ||
a2f392e4 NB |
3765 | clone_update_extent_map(BTRFS_I(inode), trans, |
3766 | path, 0, 0); | |
7ffbb598 | 3767 | |
c5c9cd4d | 3768 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 3769 | btrfs_release_path(path); |
c5c9cd4d | 3770 | |
62e2390e | 3771 | last_dest_end = ALIGN(new_key.offset + datal, |
0b246afa | 3772 | fs_info->sectorsize); |
f82a9901 FM |
3773 | ret = clone_finish_inode_update(trans, inode, |
3774 | last_dest_end, | |
1c919a5e MF |
3775 | destoff, olen, |
3776 | no_time_update); | |
f82a9901 | 3777 | if (ret) |
79787eaa | 3778 | goto out; |
2c463823 FM |
3779 | if (new_key.offset + datal >= destoff + len) |
3780 | break; | |
a22285a6 | 3781 | } |
b3b4aa74 | 3782 | btrfs_release_path(path); |
df858e76 | 3783 | key.offset = next_key_min_offset; |
69ae5e44 WX |
3784 | |
3785 | if (fatal_signal_pending(current)) { | |
3786 | ret = -EINTR; | |
3787 | goto out; | |
3788 | } | |
f46b5a66 | 3789 | } |
f46b5a66 | 3790 | ret = 0; |
32b7c687 | 3791 | |
f82a9901 FM |
3792 | if (last_dest_end < destoff + len) { |
3793 | /* | |
3794 | * We have an implicit hole (NO_HOLES feature is enabled) that | |
3795 | * fully or partially overlaps our cloning range at its end. | |
3796 | */ | |
3797 | btrfs_release_path(path); | |
3798 | ||
3799 | /* | |
3800 | * 1 - remove extent(s) | |
3801 | * 1 - inode update | |
3802 | */ | |
3803 | trans = btrfs_start_transaction(root, 2); | |
3804 | if (IS_ERR(trans)) { | |
3805 | ret = PTR_ERR(trans); | |
3806 | goto out; | |
3807 | } | |
3808 | ret = btrfs_drop_extents(trans, root, inode, | |
3809 | last_dest_end, destoff + len, 1); | |
3810 | if (ret) { | |
3811 | if (ret != -EOPNOTSUPP) | |
66642832 | 3812 | btrfs_abort_transaction(trans, ret); |
3a45bb20 | 3813 | btrfs_end_transaction(trans); |
f82a9901 FM |
3814 | goto out; |
3815 | } | |
a2f392e4 NB |
3816 | clone_update_extent_map(BTRFS_I(inode), trans, NULL, |
3817 | last_dest_end, | |
3818 | destoff + len - last_dest_end); | |
f82a9901 | 3819 | ret = clone_finish_inode_update(trans, inode, destoff + len, |
1c919a5e | 3820 | destoff, olen, no_time_update); |
f82a9901 FM |
3821 | } |
3822 | ||
f46b5a66 | 3823 | out: |
32b7c687 | 3824 | btrfs_free_path(path); |
15351955 | 3825 | kvfree(buf); |
32b7c687 MF |
3826 | return ret; |
3827 | } | |
3828 | ||
3db11b2e ZB |
3829 | static noinline int btrfs_clone_files(struct file *file, struct file *file_src, |
3830 | u64 off, u64 olen, u64 destoff) | |
32b7c687 | 3831 | { |
54563d41 | 3832 | struct inode *inode = file_inode(file); |
3db11b2e | 3833 | struct inode *src = file_inode(file_src); |
0b246afa | 3834 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
32b7c687 | 3835 | struct btrfs_root *root = BTRFS_I(inode)->root; |
32b7c687 MF |
3836 | int ret; |
3837 | u64 len = olen; | |
0b246afa | 3838 | u64 bs = fs_info->sb->s_blocksize; |
3db11b2e | 3839 | int same_inode = src == inode; |
32b7c687 MF |
3840 | |
3841 | /* | |
3842 | * TODO: | |
3843 | * - split compressed inline extents. annoying: we need to | |
3844 | * decompress into destination's address_space (the file offset | |
3845 | * may change, so source mapping won't do), then recompress (or | |
3846 | * otherwise reinsert) a subrange. | |
00fdf13a LB |
3847 | * |
3848 | * - split destination inode's inline extents. The inline extents can | |
3849 | * be either compressed or non-compressed. | |
32b7c687 MF |
3850 | */ |
3851 | ||
32b7c687 MF |
3852 | if (btrfs_root_readonly(root)) |
3853 | return -EROFS; | |
3854 | ||
3db11b2e ZB |
3855 | if (file_src->f_path.mnt != file->f_path.mnt || |
3856 | src->i_sb != inode->i_sb) | |
3857 | return -EXDEV; | |
32b7c687 MF |
3858 | |
3859 | /* don't make the dst file partly checksummed */ | |
3860 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != | |
3861 | (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) | |
3db11b2e | 3862 | return -EINVAL; |
32b7c687 | 3863 | |
32b7c687 | 3864 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) |
3db11b2e | 3865 | return -EISDIR; |
32b7c687 MF |
3866 | |
3867 | if (!same_inode) { | |
293a8489 | 3868 | btrfs_double_inode_lock(src, inode); |
32b7c687 | 3869 | } else { |
5955102c | 3870 | inode_lock(src); |
32b7c687 MF |
3871 | } |
3872 | ||
3873 | /* determine range to clone */ | |
3874 | ret = -EINVAL; | |
3875 | if (off + len > src->i_size || off + len < off) | |
3876 | goto out_unlock; | |
3877 | if (len == 0) | |
3878 | olen = len = src->i_size - off; | |
3879 | /* if we extend to eof, continue to block boundary */ | |
3880 | if (off + len == src->i_size) | |
3881 | len = ALIGN(src->i_size, bs) - off; | |
3882 | ||
ccccf3d6 FM |
3883 | if (len == 0) { |
3884 | ret = 0; | |
3885 | goto out_unlock; | |
3886 | } | |
3887 | ||
32b7c687 MF |
3888 | /* verify the end result is block aligned */ |
3889 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || | |
3890 | !IS_ALIGNED(destoff, bs)) | |
3891 | goto out_unlock; | |
3892 | ||
3893 | /* verify if ranges are overlapped within the same file */ | |
3894 | if (same_inode) { | |
3895 | if (destoff + len > off && destoff < off + len) | |
3896 | goto out_unlock; | |
3897 | } | |
3898 | ||
3899 | if (destoff > inode->i_size) { | |
3900 | ret = btrfs_cont_expand(inode, inode->i_size, destoff); | |
3901 | if (ret) | |
3902 | goto out_unlock; | |
3903 | } | |
3904 | ||
c125b8bf FM |
3905 | /* |
3906 | * Lock the target range too. Right after we replace the file extent | |
3907 | * items in the fs tree (which now point to the cloned data), we might | |
3908 | * have a worker replace them with extent items relative to a write | |
3909 | * operation that was issued before this clone operation (i.e. confront | |
3910 | * with inode.c:btrfs_finish_ordered_io). | |
3911 | */ | |
3912 | if (same_inode) { | |
3913 | u64 lock_start = min_t(u64, off, destoff); | |
3914 | u64 lock_len = max_t(u64, off, destoff) + len - lock_start; | |
32b7c687 | 3915 | |
e0bd70c6 | 3916 | ret = lock_extent_range(src, lock_start, lock_len, true); |
c125b8bf | 3917 | } else { |
e0bd70c6 FM |
3918 | ret = btrfs_double_extent_lock(src, off, inode, destoff, len, |
3919 | true); | |
3920 | } | |
3921 | ASSERT(ret == 0); | |
3922 | if (WARN_ON(ret)) { | |
3923 | /* ranges in the io trees already unlocked */ | |
3924 | goto out_unlock; | |
c125b8bf | 3925 | } |
32b7c687 | 3926 | |
1c919a5e | 3927 | ret = btrfs_clone(src, inode, off, olen, len, destoff, 0); |
32b7c687 | 3928 | |
c125b8bf FM |
3929 | if (same_inode) { |
3930 | u64 lock_start = min_t(u64, off, destoff); | |
3931 | u64 lock_end = max_t(u64, off, destoff) + len - 1; | |
3932 | ||
3933 | unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end); | |
3934 | } else { | |
293a8489 | 3935 | btrfs_double_extent_unlock(src, off, inode, destoff, len); |
c125b8bf FM |
3936 | } |
3937 | /* | |
3938 | * Truncate page cache pages so that future reads will see the cloned | |
3939 | * data immediately and not the previous data. | |
3940 | */ | |
65bfa658 | 3941 | truncate_inode_pages_range(&inode->i_data, |
09cbfeaf KS |
3942 | round_down(destoff, PAGE_SIZE), |
3943 | round_up(destoff + len, PAGE_SIZE) - 1); | |
f46b5a66 | 3944 | out_unlock: |
293a8489 MF |
3945 | if (!same_inode) |
3946 | btrfs_double_inode_unlock(src, inode); | |
3947 | else | |
5955102c | 3948 | inode_unlock(src); |
3db11b2e ZB |
3949 | return ret; |
3950 | } | |
3951 | ||
04b38d60 CH |
3952 | int btrfs_clone_file_range(struct file *src_file, loff_t off, |
3953 | struct file *dst_file, loff_t destoff, u64 len) | |
3db11b2e | 3954 | { |
04b38d60 | 3955 | return btrfs_clone_files(dst_file, src_file, off, len, destoff); |
c5c9cd4d SW |
3956 | } |
3957 | ||
f46b5a66 CH |
3958 | /* |
3959 | * there are many ways the trans_start and trans_end ioctls can lead | |
3960 | * to deadlocks. They should only be used by applications that | |
3961 | * basically own the machine, and have a very in depth understanding | |
3962 | * of all the possible deadlocks and enospc problems. | |
3963 | */ | |
b2950863 | 3964 | static long btrfs_ioctl_trans_start(struct file *file) |
f46b5a66 | 3965 | { |
496ad9aa | 3966 | struct inode *inode = file_inode(file); |
0b246afa | 3967 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
f46b5a66 CH |
3968 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3969 | struct btrfs_trans_handle *trans; | |
23b5ec74 | 3970 | struct btrfs_file_private *private; |
1ab86aed | 3971 | int ret; |
3558d4f8 | 3972 | static bool warned = false; |
f46b5a66 | 3973 | |
1ab86aed | 3974 | ret = -EPERM; |
df5b5520 | 3975 | if (!capable(CAP_SYS_ADMIN)) |
1ab86aed | 3976 | goto out; |
df5b5520 | 3977 | |
3558d4f8 NB |
3978 | if (!warned) { |
3979 | btrfs_warn(fs_info, | |
3980 | "Userspace transaction mechanism is considered " | |
3981 | "deprecated and slated to be removed in 4.17. " | |
3982 | "If you have a valid use case please " | |
3983 | "speak up on the mailing list"); | |
3984 | WARN_ON(1); | |
3985 | warned = true; | |
3986 | } | |
3987 | ||
1ab86aed | 3988 | ret = -EINPROGRESS; |
23b5ec74 JB |
3989 | private = file->private_data; |
3990 | if (private && private->trans) | |
f46b5a66 | 3991 | goto out; |
23b5ec74 JB |
3992 | if (!private) { |
3993 | private = kzalloc(sizeof(struct btrfs_file_private), | |
3994 | GFP_KERNEL); | |
3995 | if (!private) | |
3996 | return -ENOMEM; | |
3997 | file->private_data = private; | |
3998 | } | |
9ca9ee09 | 3999 | |
b83cc969 LZ |
4000 | ret = -EROFS; |
4001 | if (btrfs_root_readonly(root)) | |
4002 | goto out; | |
4003 | ||
a561be71 | 4004 | ret = mnt_want_write_file(file); |
c146afad YZ |
4005 | if (ret) |
4006 | goto out; | |
4007 | ||
0b246afa | 4008 | atomic_inc(&fs_info->open_ioctl_trans); |
9ca9ee09 | 4009 | |
1ab86aed | 4010 | ret = -ENOMEM; |
7a7eaa40 | 4011 | trans = btrfs_start_ioctl_transaction(root); |
abd30bb0 | 4012 | if (IS_ERR(trans)) |
1ab86aed SW |
4013 | goto out_drop; |
4014 | ||
23b5ec74 | 4015 | private->trans = trans; |
1ab86aed SW |
4016 | return 0; |
4017 | ||
4018 | out_drop: | |
0b246afa | 4019 | atomic_dec(&fs_info->open_ioctl_trans); |
2a79f17e | 4020 | mnt_drop_write_file(file); |
f46b5a66 | 4021 | out: |
f46b5a66 CH |
4022 | return ret; |
4023 | } | |
4024 | ||
6ef5ed0d JB |
4025 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
4026 | { | |
496ad9aa | 4027 | struct inode *inode = file_inode(file); |
0b246afa | 4028 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
6ef5ed0d JB |
4029 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4030 | struct btrfs_root *new_root; | |
4031 | struct btrfs_dir_item *di; | |
4032 | struct btrfs_trans_handle *trans; | |
4033 | struct btrfs_path *path; | |
4034 | struct btrfs_key location; | |
4035 | struct btrfs_disk_key disk_key; | |
6ef5ed0d JB |
4036 | u64 objectid = 0; |
4037 | u64 dir_id; | |
3c04ce01 | 4038 | int ret; |
6ef5ed0d JB |
4039 | |
4040 | if (!capable(CAP_SYS_ADMIN)) | |
4041 | return -EPERM; | |
4042 | ||
3c04ce01 MX |
4043 | ret = mnt_want_write_file(file); |
4044 | if (ret) | |
4045 | return ret; | |
4046 | ||
4047 | if (copy_from_user(&objectid, argp, sizeof(objectid))) { | |
4048 | ret = -EFAULT; | |
4049 | goto out; | |
4050 | } | |
6ef5ed0d JB |
4051 | |
4052 | if (!objectid) | |
1cecf579 | 4053 | objectid = BTRFS_FS_TREE_OBJECTID; |
6ef5ed0d JB |
4054 | |
4055 | location.objectid = objectid; | |
4056 | location.type = BTRFS_ROOT_ITEM_KEY; | |
4057 | location.offset = (u64)-1; | |
4058 | ||
0b246afa | 4059 | new_root = btrfs_read_fs_root_no_name(fs_info, &location); |
3c04ce01 MX |
4060 | if (IS_ERR(new_root)) { |
4061 | ret = PTR_ERR(new_root); | |
4062 | goto out; | |
4063 | } | |
6d6d2829 | 4064 | if (!is_fstree(new_root->objectid)) { |
4065 | ret = -ENOENT; | |
4066 | goto out; | |
4067 | } | |
6ef5ed0d | 4068 | |
6ef5ed0d | 4069 | path = btrfs_alloc_path(); |
3c04ce01 MX |
4070 | if (!path) { |
4071 | ret = -ENOMEM; | |
4072 | goto out; | |
4073 | } | |
6ef5ed0d JB |
4074 | path->leave_spinning = 1; |
4075 | ||
4076 | trans = btrfs_start_transaction(root, 1); | |
98d5dc13 | 4077 | if (IS_ERR(trans)) { |
6ef5ed0d | 4078 | btrfs_free_path(path); |
3c04ce01 MX |
4079 | ret = PTR_ERR(trans); |
4080 | goto out; | |
6ef5ed0d JB |
4081 | } |
4082 | ||
0b246afa JM |
4083 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
4084 | di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, | |
6ef5ed0d | 4085 | dir_id, "default", 7, 1); |
cf1e99a4 | 4086 | if (IS_ERR_OR_NULL(di)) { |
6ef5ed0d | 4087 | btrfs_free_path(path); |
3a45bb20 | 4088 | btrfs_end_transaction(trans); |
0b246afa | 4089 | btrfs_err(fs_info, |
5d163e0e | 4090 | "Umm, you don't have the default diritem, this isn't going to work"); |
3c04ce01 MX |
4091 | ret = -ENOENT; |
4092 | goto out; | |
6ef5ed0d JB |
4093 | } |
4094 | ||
4095 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); | |
4096 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); | |
4097 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
4098 | btrfs_free_path(path); | |
4099 | ||
0b246afa | 4100 | btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); |
3a45bb20 | 4101 | btrfs_end_transaction(trans); |
3c04ce01 MX |
4102 | out: |
4103 | mnt_drop_write_file(file); | |
4104 | return ret; | |
6ef5ed0d JB |
4105 | } |
4106 | ||
5af3e8cc SB |
4107 | void btrfs_get_block_group_info(struct list_head *groups_list, |
4108 | struct btrfs_ioctl_space_info *space) | |
bf5fc093 JB |
4109 | { |
4110 | struct btrfs_block_group_cache *block_group; | |
4111 | ||
4112 | space->total_bytes = 0; | |
4113 | space->used_bytes = 0; | |
4114 | space->flags = 0; | |
4115 | list_for_each_entry(block_group, groups_list, list) { | |
4116 | space->flags = block_group->flags; | |
4117 | space->total_bytes += block_group->key.offset; | |
4118 | space->used_bytes += | |
4119 | btrfs_block_group_used(&block_group->item); | |
4120 | } | |
4121 | } | |
4122 | ||
2ff7e61e JM |
4123 | static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, |
4124 | void __user *arg) | |
1406e432 JB |
4125 | { |
4126 | struct btrfs_ioctl_space_args space_args; | |
4127 | struct btrfs_ioctl_space_info space; | |
4128 | struct btrfs_ioctl_space_info *dest; | |
7fde62bf | 4129 | struct btrfs_ioctl_space_info *dest_orig; |
13f2696f | 4130 | struct btrfs_ioctl_space_info __user *user_dest; |
1406e432 | 4131 | struct btrfs_space_info *info; |
bf5fc093 JB |
4132 | u64 types[] = {BTRFS_BLOCK_GROUP_DATA, |
4133 | BTRFS_BLOCK_GROUP_SYSTEM, | |
4134 | BTRFS_BLOCK_GROUP_METADATA, | |
4135 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; | |
4136 | int num_types = 4; | |
7fde62bf | 4137 | int alloc_size; |
1406e432 | 4138 | int ret = 0; |
51788b1b | 4139 | u64 slot_count = 0; |
bf5fc093 | 4140 | int i, c; |
1406e432 JB |
4141 | |
4142 | if (copy_from_user(&space_args, | |
4143 | (struct btrfs_ioctl_space_args __user *)arg, | |
4144 | sizeof(space_args))) | |
4145 | return -EFAULT; | |
4146 | ||
bf5fc093 JB |
4147 | for (i = 0; i < num_types; i++) { |
4148 | struct btrfs_space_info *tmp; | |
4149 | ||
4150 | info = NULL; | |
4151 | rcu_read_lock(); | |
0b246afa | 4152 | list_for_each_entry_rcu(tmp, &fs_info->space_info, |
bf5fc093 JB |
4153 | list) { |
4154 | if (tmp->flags == types[i]) { | |
4155 | info = tmp; | |
4156 | break; | |
4157 | } | |
4158 | } | |
4159 | rcu_read_unlock(); | |
4160 | ||
4161 | if (!info) | |
4162 | continue; | |
4163 | ||
4164 | down_read(&info->groups_sem); | |
4165 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
4166 | if (!list_empty(&info->block_groups[c])) | |
4167 | slot_count++; | |
4168 | } | |
4169 | up_read(&info->groups_sem); | |
4170 | } | |
7fde62bf | 4171 | |
36523e95 DS |
4172 | /* |
4173 | * Global block reserve, exported as a space_info | |
4174 | */ | |
4175 | slot_count++; | |
4176 | ||
7fde62bf CM |
4177 | /* space_slots == 0 means they are asking for a count */ |
4178 | if (space_args.space_slots == 0) { | |
4179 | space_args.total_spaces = slot_count; | |
4180 | goto out; | |
4181 | } | |
bf5fc093 | 4182 | |
51788b1b | 4183 | slot_count = min_t(u64, space_args.space_slots, slot_count); |
bf5fc093 | 4184 | |
7fde62bf | 4185 | alloc_size = sizeof(*dest) * slot_count; |
bf5fc093 | 4186 | |
7fde62bf CM |
4187 | /* we generally have at most 6 or so space infos, one for each raid |
4188 | * level. So, a whole page should be more than enough for everyone | |
4189 | */ | |
09cbfeaf | 4190 | if (alloc_size > PAGE_SIZE) |
7fde62bf CM |
4191 | return -ENOMEM; |
4192 | ||
1406e432 | 4193 | space_args.total_spaces = 0; |
8d2db785 | 4194 | dest = kmalloc(alloc_size, GFP_KERNEL); |
7fde62bf CM |
4195 | if (!dest) |
4196 | return -ENOMEM; | |
4197 | dest_orig = dest; | |
1406e432 | 4198 | |
7fde62bf | 4199 | /* now we have a buffer to copy into */ |
bf5fc093 JB |
4200 | for (i = 0; i < num_types; i++) { |
4201 | struct btrfs_space_info *tmp; | |
4202 | ||
51788b1b DR |
4203 | if (!slot_count) |
4204 | break; | |
4205 | ||
bf5fc093 JB |
4206 | info = NULL; |
4207 | rcu_read_lock(); | |
0b246afa | 4208 | list_for_each_entry_rcu(tmp, &fs_info->space_info, |
bf5fc093 JB |
4209 | list) { |
4210 | if (tmp->flags == types[i]) { | |
4211 | info = tmp; | |
4212 | break; | |
4213 | } | |
4214 | } | |
4215 | rcu_read_unlock(); | |
7fde62bf | 4216 | |
bf5fc093 JB |
4217 | if (!info) |
4218 | continue; | |
4219 | down_read(&info->groups_sem); | |
4220 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
4221 | if (!list_empty(&info->block_groups[c])) { | |
5af3e8cc SB |
4222 | btrfs_get_block_group_info( |
4223 | &info->block_groups[c], &space); | |
bf5fc093 JB |
4224 | memcpy(dest, &space, sizeof(space)); |
4225 | dest++; | |
4226 | space_args.total_spaces++; | |
51788b1b | 4227 | slot_count--; |
bf5fc093 | 4228 | } |
51788b1b DR |
4229 | if (!slot_count) |
4230 | break; | |
bf5fc093 JB |
4231 | } |
4232 | up_read(&info->groups_sem); | |
1406e432 | 4233 | } |
1406e432 | 4234 | |
36523e95 DS |
4235 | /* |
4236 | * Add global block reserve | |
4237 | */ | |
4238 | if (slot_count) { | |
0b246afa | 4239 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; |
36523e95 DS |
4240 | |
4241 | spin_lock(&block_rsv->lock); | |
4242 | space.total_bytes = block_rsv->size; | |
4243 | space.used_bytes = block_rsv->size - block_rsv->reserved; | |
4244 | spin_unlock(&block_rsv->lock); | |
4245 | space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; | |
4246 | memcpy(dest, &space, sizeof(space)); | |
4247 | space_args.total_spaces++; | |
4248 | } | |
4249 | ||
2eec6c81 | 4250 | user_dest = (struct btrfs_ioctl_space_info __user *) |
7fde62bf CM |
4251 | (arg + sizeof(struct btrfs_ioctl_space_args)); |
4252 | ||
4253 | if (copy_to_user(user_dest, dest_orig, alloc_size)) | |
4254 | ret = -EFAULT; | |
4255 | ||
4256 | kfree(dest_orig); | |
4257 | out: | |
4258 | if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) | |
1406e432 JB |
4259 | ret = -EFAULT; |
4260 | ||
4261 | return ret; | |
4262 | } | |
4263 | ||
f46b5a66 CH |
4264 | /* |
4265 | * there are many ways the trans_start and trans_end ioctls can lead | |
4266 | * to deadlocks. They should only be used by applications that | |
4267 | * basically own the machine, and have a very in depth understanding | |
4268 | * of all the possible deadlocks and enospc problems. | |
4269 | */ | |
4270 | long btrfs_ioctl_trans_end(struct file *file) | |
4271 | { | |
496ad9aa | 4272 | struct inode *inode = file_inode(file); |
f46b5a66 | 4273 | struct btrfs_root *root = BTRFS_I(inode)->root; |
23b5ec74 | 4274 | struct btrfs_file_private *private = file->private_data; |
f46b5a66 | 4275 | |
23b5ec74 | 4276 | if (!private || !private->trans) |
1ab86aed | 4277 | return -EINVAL; |
9ca9ee09 | 4278 | |
23b5ec74 JB |
4279 | btrfs_end_transaction(private->trans); |
4280 | private->trans = NULL; | |
1ab86aed | 4281 | |
a4abeea4 | 4282 | atomic_dec(&root->fs_info->open_ioctl_trans); |
9ca9ee09 | 4283 | |
2a79f17e | 4284 | mnt_drop_write_file(file); |
1ab86aed | 4285 | return 0; |
f46b5a66 CH |
4286 | } |
4287 | ||
9a8c28be MX |
4288 | static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, |
4289 | void __user *argp) | |
46204592 | 4290 | { |
46204592 SW |
4291 | struct btrfs_trans_handle *trans; |
4292 | u64 transid; | |
db5b493a | 4293 | int ret; |
46204592 | 4294 | |
d4edf39b | 4295 | trans = btrfs_attach_transaction_barrier(root); |
ff7c1d33 MX |
4296 | if (IS_ERR(trans)) { |
4297 | if (PTR_ERR(trans) != -ENOENT) | |
4298 | return PTR_ERR(trans); | |
4299 | ||
4300 | /* No running transaction, don't bother */ | |
4301 | transid = root->fs_info->last_trans_committed; | |
4302 | goto out; | |
4303 | } | |
46204592 | 4304 | transid = trans->transid; |
3a45bb20 | 4305 | ret = btrfs_commit_transaction_async(trans, 0); |
8b2b2d3c | 4306 | if (ret) { |
3a45bb20 | 4307 | btrfs_end_transaction(trans); |
db5b493a | 4308 | return ret; |
8b2b2d3c | 4309 | } |
ff7c1d33 | 4310 | out: |
46204592 SW |
4311 | if (argp) |
4312 | if (copy_to_user(argp, &transid, sizeof(transid))) | |
4313 | return -EFAULT; | |
4314 | return 0; | |
4315 | } | |
4316 | ||
2ff7e61e | 4317 | static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, |
9a8c28be | 4318 | void __user *argp) |
46204592 | 4319 | { |
46204592 SW |
4320 | u64 transid; |
4321 | ||
4322 | if (argp) { | |
4323 | if (copy_from_user(&transid, argp, sizeof(transid))) | |
4324 | return -EFAULT; | |
4325 | } else { | |
4326 | transid = 0; /* current trans */ | |
4327 | } | |
2ff7e61e | 4328 | return btrfs_wait_for_commit(fs_info, transid); |
46204592 SW |
4329 | } |
4330 | ||
b8e95489 | 4331 | static long btrfs_ioctl_scrub(struct file *file, void __user *arg) |
475f6387 | 4332 | { |
0b246afa | 4333 | struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); |
475f6387 | 4334 | struct btrfs_ioctl_scrub_args *sa; |
b8e95489 | 4335 | int ret; |
475f6387 JS |
4336 | |
4337 | if (!capable(CAP_SYS_ADMIN)) | |
4338 | return -EPERM; | |
4339 | ||
4340 | sa = memdup_user(arg, sizeof(*sa)); | |
4341 | if (IS_ERR(sa)) | |
4342 | return PTR_ERR(sa); | |
4343 | ||
b8e95489 MX |
4344 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) { |
4345 | ret = mnt_want_write_file(file); | |
4346 | if (ret) | |
4347 | goto out; | |
4348 | } | |
4349 | ||
0b246afa | 4350 | ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, |
63a212ab SB |
4351 | &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, |
4352 | 0); | |
475f6387 JS |
4353 | |
4354 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
4355 | ret = -EFAULT; | |
4356 | ||
b8e95489 MX |
4357 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) |
4358 | mnt_drop_write_file(file); | |
4359 | out: | |
475f6387 JS |
4360 | kfree(sa); |
4361 | return ret; | |
4362 | } | |
4363 | ||
2ff7e61e | 4364 | static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) |
475f6387 JS |
4365 | { |
4366 | if (!capable(CAP_SYS_ADMIN)) | |
4367 | return -EPERM; | |
4368 | ||
2ff7e61e | 4369 | return btrfs_scrub_cancel(fs_info); |
475f6387 JS |
4370 | } |
4371 | ||
2ff7e61e | 4372 | static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, |
475f6387 JS |
4373 | void __user *arg) |
4374 | { | |
4375 | struct btrfs_ioctl_scrub_args *sa; | |
4376 | int ret; | |
4377 | ||
4378 | if (!capable(CAP_SYS_ADMIN)) | |
4379 | return -EPERM; | |
4380 | ||
4381 | sa = memdup_user(arg, sizeof(*sa)); | |
4382 | if (IS_ERR(sa)) | |
4383 | return PTR_ERR(sa); | |
4384 | ||
2ff7e61e | 4385 | ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); |
475f6387 JS |
4386 | |
4387 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
4388 | ret = -EFAULT; | |
4389 | ||
4390 | kfree(sa); | |
4391 | return ret; | |
4392 | } | |
4393 | ||
2ff7e61e | 4394 | static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, |
b27f7c0c | 4395 | void __user *arg) |
c11d2c23 SB |
4396 | { |
4397 | struct btrfs_ioctl_get_dev_stats *sa; | |
4398 | int ret; | |
4399 | ||
c11d2c23 SB |
4400 | sa = memdup_user(arg, sizeof(*sa)); |
4401 | if (IS_ERR(sa)) | |
4402 | return PTR_ERR(sa); | |
4403 | ||
b27f7c0c DS |
4404 | if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { |
4405 | kfree(sa); | |
4406 | return -EPERM; | |
4407 | } | |
4408 | ||
2ff7e61e | 4409 | ret = btrfs_get_dev_stats(fs_info, sa); |
c11d2c23 SB |
4410 | |
4411 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
4412 | ret = -EFAULT; | |
4413 | ||
4414 | kfree(sa); | |
4415 | return ret; | |
4416 | } | |
4417 | ||
2ff7e61e JM |
4418 | static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, |
4419 | void __user *arg) | |
3f6bcfbd SB |
4420 | { |
4421 | struct btrfs_ioctl_dev_replace_args *p; | |
4422 | int ret; | |
4423 | ||
4424 | if (!capable(CAP_SYS_ADMIN)) | |
4425 | return -EPERM; | |
4426 | ||
4427 | p = memdup_user(arg, sizeof(*p)); | |
4428 | if (IS_ERR(p)) | |
4429 | return PTR_ERR(p); | |
4430 | ||
4431 | switch (p->cmd) { | |
4432 | case BTRFS_IOCTL_DEV_REPLACE_CMD_START: | |
bc98a42c | 4433 | if (sb_rdonly(fs_info->sb)) { |
adfa97cb ID |
4434 | ret = -EROFS; |
4435 | goto out; | |
4436 | } | |
171938e5 | 4437 | if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { |
e57138b3 | 4438 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
3f6bcfbd | 4439 | } else { |
2ff7e61e | 4440 | ret = btrfs_dev_replace_by_ioctl(fs_info, p); |
171938e5 | 4441 | clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); |
3f6bcfbd SB |
4442 | } |
4443 | break; | |
4444 | case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: | |
0b246afa | 4445 | btrfs_dev_replace_status(fs_info, p); |
3f6bcfbd SB |
4446 | ret = 0; |
4447 | break; | |
4448 | case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: | |
0b246afa | 4449 | ret = btrfs_dev_replace_cancel(fs_info, p); |
3f6bcfbd SB |
4450 | break; |
4451 | default: | |
4452 | ret = -EINVAL; | |
4453 | break; | |
4454 | } | |
4455 | ||
4456 | if (copy_to_user(arg, p, sizeof(*p))) | |
4457 | ret = -EFAULT; | |
adfa97cb | 4458 | out: |
3f6bcfbd SB |
4459 | kfree(p); |
4460 | return ret; | |
4461 | } | |
4462 | ||
d7728c96 JS |
4463 | static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) |
4464 | { | |
4465 | int ret = 0; | |
4466 | int i; | |
740c3d22 | 4467 | u64 rel_ptr; |
d7728c96 | 4468 | int size; |
806468f8 | 4469 | struct btrfs_ioctl_ino_path_args *ipa = NULL; |
d7728c96 JS |
4470 | struct inode_fs_paths *ipath = NULL; |
4471 | struct btrfs_path *path; | |
4472 | ||
82b22ac8 | 4473 | if (!capable(CAP_DAC_READ_SEARCH)) |
d7728c96 JS |
4474 | return -EPERM; |
4475 | ||
4476 | path = btrfs_alloc_path(); | |
4477 | if (!path) { | |
4478 | ret = -ENOMEM; | |
4479 | goto out; | |
4480 | } | |
4481 | ||
4482 | ipa = memdup_user(arg, sizeof(*ipa)); | |
4483 | if (IS_ERR(ipa)) { | |
4484 | ret = PTR_ERR(ipa); | |
4485 | ipa = NULL; | |
4486 | goto out; | |
4487 | } | |
4488 | ||
4489 | size = min_t(u32, ipa->size, 4096); | |
4490 | ipath = init_ipath(size, root, path); | |
4491 | if (IS_ERR(ipath)) { | |
4492 | ret = PTR_ERR(ipath); | |
4493 | ipath = NULL; | |
4494 | goto out; | |
4495 | } | |
4496 | ||
4497 | ret = paths_from_inode(ipa->inum, ipath); | |
4498 | if (ret < 0) | |
4499 | goto out; | |
4500 | ||
4501 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) { | |
745c4d8e JM |
4502 | rel_ptr = ipath->fspath->val[i] - |
4503 | (u64)(unsigned long)ipath->fspath->val; | |
740c3d22 | 4504 | ipath->fspath->val[i] = rel_ptr; |
d7728c96 JS |
4505 | } |
4506 | ||
745c4d8e JM |
4507 | ret = copy_to_user((void *)(unsigned long)ipa->fspath, |
4508 | (void *)(unsigned long)ipath->fspath, size); | |
d7728c96 JS |
4509 | if (ret) { |
4510 | ret = -EFAULT; | |
4511 | goto out; | |
4512 | } | |
4513 | ||
4514 | out: | |
4515 | btrfs_free_path(path); | |
4516 | free_ipath(ipath); | |
4517 | kfree(ipa); | |
4518 | ||
4519 | return ret; | |
4520 | } | |
4521 | ||
4522 | static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) | |
4523 | { | |
4524 | struct btrfs_data_container *inodes = ctx; | |
4525 | const size_t c = 3 * sizeof(u64); | |
4526 | ||
4527 | if (inodes->bytes_left >= c) { | |
4528 | inodes->bytes_left -= c; | |
4529 | inodes->val[inodes->elem_cnt] = inum; | |
4530 | inodes->val[inodes->elem_cnt + 1] = offset; | |
4531 | inodes->val[inodes->elem_cnt + 2] = root; | |
4532 | inodes->elem_cnt += 3; | |
4533 | } else { | |
4534 | inodes->bytes_missing += c - inodes->bytes_left; | |
4535 | inodes->bytes_left = 0; | |
4536 | inodes->elem_missed += 3; | |
4537 | } | |
4538 | ||
4539 | return 0; | |
4540 | } | |
4541 | ||
2ff7e61e | 4542 | static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, |
d7728c96 JS |
4543 | void __user *arg) |
4544 | { | |
4545 | int ret = 0; | |
4546 | int size; | |
d7728c96 JS |
4547 | struct btrfs_ioctl_logical_ino_args *loi; |
4548 | struct btrfs_data_container *inodes = NULL; | |
4549 | struct btrfs_path *path = NULL; | |
d7728c96 JS |
4550 | |
4551 | if (!capable(CAP_SYS_ADMIN)) | |
4552 | return -EPERM; | |
4553 | ||
4554 | loi = memdup_user(arg, sizeof(*loi)); | |
7b9ea627 SV |
4555 | if (IS_ERR(loi)) |
4556 | return PTR_ERR(loi); | |
d7728c96 JS |
4557 | |
4558 | path = btrfs_alloc_path(); | |
4559 | if (!path) { | |
4560 | ret = -ENOMEM; | |
4561 | goto out; | |
4562 | } | |
4563 | ||
ee22184b | 4564 | size = min_t(u32, loi->size, SZ_64K); |
d7728c96 JS |
4565 | inodes = init_data_container(size); |
4566 | if (IS_ERR(inodes)) { | |
4567 | ret = PTR_ERR(inodes); | |
4568 | inodes = NULL; | |
4569 | goto out; | |
4570 | } | |
4571 | ||
2ff7e61e | 4572 | ret = iterate_inodes_from_logical(loi->logical, fs_info, path, |
df031f07 LB |
4573 | build_ino_list, inodes); |
4574 | if (ret == -EINVAL) | |
d7728c96 JS |
4575 | ret = -ENOENT; |
4576 | if (ret < 0) | |
4577 | goto out; | |
4578 | ||
745c4d8e JM |
4579 | ret = copy_to_user((void *)(unsigned long)loi->inodes, |
4580 | (void *)(unsigned long)inodes, size); | |
d7728c96 JS |
4581 | if (ret) |
4582 | ret = -EFAULT; | |
4583 | ||
4584 | out: | |
4585 | btrfs_free_path(path); | |
f54de068 | 4586 | kvfree(inodes); |
d7728c96 JS |
4587 | kfree(loi); |
4588 | ||
4589 | return ret; | |
4590 | } | |
4591 | ||
19a39dce | 4592 | void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, |
c9e9f97b ID |
4593 | struct btrfs_ioctl_balance_args *bargs) |
4594 | { | |
4595 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
4596 | ||
4597 | bargs->flags = bctl->flags; | |
4598 | ||
837d5b6e ID |
4599 | if (atomic_read(&fs_info->balance_running)) |
4600 | bargs->state |= BTRFS_BALANCE_STATE_RUNNING; | |
4601 | if (atomic_read(&fs_info->balance_pause_req)) | |
4602 | bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; | |
a7e99c69 ID |
4603 | if (atomic_read(&fs_info->balance_cancel_req)) |
4604 | bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; | |
837d5b6e | 4605 | |
c9e9f97b ID |
4606 | memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); |
4607 | memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); | |
4608 | memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); | |
19a39dce ID |
4609 | |
4610 | if (lock) { | |
4611 | spin_lock(&fs_info->balance_lock); | |
4612 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
4613 | spin_unlock(&fs_info->balance_lock); | |
4614 | } else { | |
4615 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
4616 | } | |
c9e9f97b ID |
4617 | } |
4618 | ||
9ba1f6e4 | 4619 | static long btrfs_ioctl_balance(struct file *file, void __user *arg) |
c9e9f97b | 4620 | { |
496ad9aa | 4621 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
c9e9f97b ID |
4622 | struct btrfs_fs_info *fs_info = root->fs_info; |
4623 | struct btrfs_ioctl_balance_args *bargs; | |
4624 | struct btrfs_balance_control *bctl; | |
ed0fb78f | 4625 | bool need_unlock; /* for mut. excl. ops lock */ |
c9e9f97b ID |
4626 | int ret; |
4627 | ||
4628 | if (!capable(CAP_SYS_ADMIN)) | |
4629 | return -EPERM; | |
4630 | ||
e54bfa31 | 4631 | ret = mnt_want_write_file(file); |
9ba1f6e4 LB |
4632 | if (ret) |
4633 | return ret; | |
4634 | ||
ed0fb78f | 4635 | again: |
171938e5 | 4636 | if (!test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { |
ed0fb78f ID |
4637 | mutex_lock(&fs_info->volume_mutex); |
4638 | mutex_lock(&fs_info->balance_mutex); | |
4639 | need_unlock = true; | |
4640 | goto locked; | |
4641 | } | |
4642 | ||
4643 | /* | |
01327610 | 4644 | * mut. excl. ops lock is locked. Three possibilities: |
ed0fb78f ID |
4645 | * (1) some other op is running |
4646 | * (2) balance is running | |
4647 | * (3) balance is paused -- special case (think resume) | |
4648 | */ | |
c9e9f97b | 4649 | mutex_lock(&fs_info->balance_mutex); |
ed0fb78f ID |
4650 | if (fs_info->balance_ctl) { |
4651 | /* this is either (2) or (3) */ | |
4652 | if (!atomic_read(&fs_info->balance_running)) { | |
4653 | mutex_unlock(&fs_info->balance_mutex); | |
4654 | if (!mutex_trylock(&fs_info->volume_mutex)) | |
4655 | goto again; | |
4656 | mutex_lock(&fs_info->balance_mutex); | |
4657 | ||
4658 | if (fs_info->balance_ctl && | |
4659 | !atomic_read(&fs_info->balance_running)) { | |
4660 | /* this is (3) */ | |
4661 | need_unlock = false; | |
4662 | goto locked; | |
4663 | } | |
4664 | ||
4665 | mutex_unlock(&fs_info->balance_mutex); | |
4666 | mutex_unlock(&fs_info->volume_mutex); | |
4667 | goto again; | |
4668 | } else { | |
4669 | /* this is (2) */ | |
4670 | mutex_unlock(&fs_info->balance_mutex); | |
4671 | ret = -EINPROGRESS; | |
4672 | goto out; | |
4673 | } | |
4674 | } else { | |
4675 | /* this is (1) */ | |
4676 | mutex_unlock(&fs_info->balance_mutex); | |
e57138b3 | 4677 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
ed0fb78f ID |
4678 | goto out; |
4679 | } | |
4680 | ||
4681 | locked: | |
171938e5 | 4682 | BUG_ON(!test_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)); |
c9e9f97b ID |
4683 | |
4684 | if (arg) { | |
4685 | bargs = memdup_user(arg, sizeof(*bargs)); | |
4686 | if (IS_ERR(bargs)) { | |
4687 | ret = PTR_ERR(bargs); | |
ed0fb78f | 4688 | goto out_unlock; |
c9e9f97b | 4689 | } |
de322263 ID |
4690 | |
4691 | if (bargs->flags & BTRFS_BALANCE_RESUME) { | |
4692 | if (!fs_info->balance_ctl) { | |
4693 | ret = -ENOTCONN; | |
4694 | goto out_bargs; | |
4695 | } | |
4696 | ||
4697 | bctl = fs_info->balance_ctl; | |
4698 | spin_lock(&fs_info->balance_lock); | |
4699 | bctl->flags |= BTRFS_BALANCE_RESUME; | |
4700 | spin_unlock(&fs_info->balance_lock); | |
4701 | ||
4702 | goto do_balance; | |
4703 | } | |
c9e9f97b ID |
4704 | } else { |
4705 | bargs = NULL; | |
4706 | } | |
4707 | ||
ed0fb78f | 4708 | if (fs_info->balance_ctl) { |
837d5b6e ID |
4709 | ret = -EINPROGRESS; |
4710 | goto out_bargs; | |
4711 | } | |
4712 | ||
8d2db785 | 4713 | bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); |
c9e9f97b ID |
4714 | if (!bctl) { |
4715 | ret = -ENOMEM; | |
4716 | goto out_bargs; | |
4717 | } | |
4718 | ||
4719 | bctl->fs_info = fs_info; | |
4720 | if (arg) { | |
4721 | memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); | |
4722 | memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); | |
4723 | memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); | |
4724 | ||
4725 | bctl->flags = bargs->flags; | |
f43ffb60 ID |
4726 | } else { |
4727 | /* balance everything - no filters */ | |
4728 | bctl->flags |= BTRFS_BALANCE_TYPE_MASK; | |
c9e9f97b ID |
4729 | } |
4730 | ||
8eb93459 DS |
4731 | if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { |
4732 | ret = -EINVAL; | |
0f89abf5 | 4733 | goto out_bctl; |
8eb93459 DS |
4734 | } |
4735 | ||
de322263 | 4736 | do_balance: |
c9e9f97b | 4737 | /* |
171938e5 | 4738 | * Ownership of bctl and filesystem flag BTRFS_FS_EXCL_OP |
ed0fb78f ID |
4739 | * goes to to btrfs_balance. bctl is freed in __cancel_balance, |
4740 | * or, if restriper was paused all the way until unmount, in | |
171938e5 | 4741 | * free_fs_info. The flag is cleared in __cancel_balance. |
c9e9f97b | 4742 | */ |
ed0fb78f ID |
4743 | need_unlock = false; |
4744 | ||
4745 | ret = btrfs_balance(bctl, bargs); | |
0f89abf5 | 4746 | bctl = NULL; |
ed0fb78f | 4747 | |
c9e9f97b ID |
4748 | if (arg) { |
4749 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
4750 | ret = -EFAULT; | |
4751 | } | |
4752 | ||
0f89abf5 CE |
4753 | out_bctl: |
4754 | kfree(bctl); | |
c9e9f97b ID |
4755 | out_bargs: |
4756 | kfree(bargs); | |
ed0fb78f | 4757 | out_unlock: |
c9e9f97b ID |
4758 | mutex_unlock(&fs_info->balance_mutex); |
4759 | mutex_unlock(&fs_info->volume_mutex); | |
ed0fb78f | 4760 | if (need_unlock) |
171938e5 | 4761 | clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); |
ed0fb78f | 4762 | out: |
e54bfa31 | 4763 | mnt_drop_write_file(file); |
c9e9f97b ID |
4764 | return ret; |
4765 | } | |
4766 | ||
2ff7e61e | 4767 | static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) |
837d5b6e ID |
4768 | { |
4769 | if (!capable(CAP_SYS_ADMIN)) | |
4770 | return -EPERM; | |
4771 | ||
4772 | switch (cmd) { | |
4773 | case BTRFS_BALANCE_CTL_PAUSE: | |
0b246afa | 4774 | return btrfs_pause_balance(fs_info); |
a7e99c69 | 4775 | case BTRFS_BALANCE_CTL_CANCEL: |
0b246afa | 4776 | return btrfs_cancel_balance(fs_info); |
837d5b6e ID |
4777 | } |
4778 | ||
4779 | return -EINVAL; | |
4780 | } | |
4781 | ||
2ff7e61e | 4782 | static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, |
19a39dce ID |
4783 | void __user *arg) |
4784 | { | |
19a39dce ID |
4785 | struct btrfs_ioctl_balance_args *bargs; |
4786 | int ret = 0; | |
4787 | ||
4788 | if (!capable(CAP_SYS_ADMIN)) | |
4789 | return -EPERM; | |
4790 | ||
4791 | mutex_lock(&fs_info->balance_mutex); | |
4792 | if (!fs_info->balance_ctl) { | |
4793 | ret = -ENOTCONN; | |
4794 | goto out; | |
4795 | } | |
4796 | ||
8d2db785 | 4797 | bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); |
19a39dce ID |
4798 | if (!bargs) { |
4799 | ret = -ENOMEM; | |
4800 | goto out; | |
4801 | } | |
4802 | ||
4803 | update_ioctl_balance_args(fs_info, 1, bargs); | |
4804 | ||
4805 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
4806 | ret = -EFAULT; | |
4807 | ||
4808 | kfree(bargs); | |
4809 | out: | |
4810 | mutex_unlock(&fs_info->balance_mutex); | |
4811 | return ret; | |
4812 | } | |
4813 | ||
905b0dda | 4814 | static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) |
5d13a37b | 4815 | { |
0b246afa JM |
4816 | struct inode *inode = file_inode(file); |
4817 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
5d13a37b AJ |
4818 | struct btrfs_ioctl_quota_ctl_args *sa; |
4819 | struct btrfs_trans_handle *trans = NULL; | |
4820 | int ret; | |
4821 | int err; | |
4822 | ||
4823 | if (!capable(CAP_SYS_ADMIN)) | |
4824 | return -EPERM; | |
4825 | ||
905b0dda MX |
4826 | ret = mnt_want_write_file(file); |
4827 | if (ret) | |
4828 | return ret; | |
5d13a37b AJ |
4829 | |
4830 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4831 | if (IS_ERR(sa)) { |
4832 | ret = PTR_ERR(sa); | |
4833 | goto drop_write; | |
4834 | } | |
5d13a37b | 4835 | |
0b246afa JM |
4836 | down_write(&fs_info->subvol_sem); |
4837 | trans = btrfs_start_transaction(fs_info->tree_root, 2); | |
2f232036 JS |
4838 | if (IS_ERR(trans)) { |
4839 | ret = PTR_ERR(trans); | |
4840 | goto out; | |
5d13a37b AJ |
4841 | } |
4842 | ||
4843 | switch (sa->cmd) { | |
4844 | case BTRFS_QUOTA_CTL_ENABLE: | |
0b246afa | 4845 | ret = btrfs_quota_enable(trans, fs_info); |
5d13a37b AJ |
4846 | break; |
4847 | case BTRFS_QUOTA_CTL_DISABLE: | |
0b246afa | 4848 | ret = btrfs_quota_disable(trans, fs_info); |
5d13a37b | 4849 | break; |
5d13a37b AJ |
4850 | default: |
4851 | ret = -EINVAL; | |
4852 | break; | |
4853 | } | |
4854 | ||
3a45bb20 | 4855 | err = btrfs_commit_transaction(trans); |
2f232036 JS |
4856 | if (err && !ret) |
4857 | ret = err; | |
5d13a37b AJ |
4858 | out: |
4859 | kfree(sa); | |
0b246afa | 4860 | up_write(&fs_info->subvol_sem); |
905b0dda MX |
4861 | drop_write: |
4862 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4863 | return ret; |
4864 | } | |
4865 | ||
905b0dda | 4866 | static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) |
5d13a37b | 4867 | { |
0b246afa JM |
4868 | struct inode *inode = file_inode(file); |
4869 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
4870 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5d13a37b AJ |
4871 | struct btrfs_ioctl_qgroup_assign_args *sa; |
4872 | struct btrfs_trans_handle *trans; | |
4873 | int ret; | |
4874 | int err; | |
4875 | ||
4876 | if (!capable(CAP_SYS_ADMIN)) | |
4877 | return -EPERM; | |
4878 | ||
905b0dda MX |
4879 | ret = mnt_want_write_file(file); |
4880 | if (ret) | |
4881 | return ret; | |
5d13a37b AJ |
4882 | |
4883 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4884 | if (IS_ERR(sa)) { |
4885 | ret = PTR_ERR(sa); | |
4886 | goto drop_write; | |
4887 | } | |
5d13a37b AJ |
4888 | |
4889 | trans = btrfs_join_transaction(root); | |
4890 | if (IS_ERR(trans)) { | |
4891 | ret = PTR_ERR(trans); | |
4892 | goto out; | |
4893 | } | |
4894 | ||
5d13a37b | 4895 | if (sa->assign) { |
0b246afa | 4896 | ret = btrfs_add_qgroup_relation(trans, fs_info, |
5d13a37b AJ |
4897 | sa->src, sa->dst); |
4898 | } else { | |
0b246afa | 4899 | ret = btrfs_del_qgroup_relation(trans, fs_info, |
5d13a37b AJ |
4900 | sa->src, sa->dst); |
4901 | } | |
4902 | ||
e082f563 | 4903 | /* update qgroup status and info */ |
0b246afa | 4904 | err = btrfs_run_qgroups(trans, fs_info); |
e082f563 | 4905 | if (err < 0) |
0b246afa JM |
4906 | btrfs_handle_fs_error(fs_info, err, |
4907 | "failed to update qgroup status and info"); | |
3a45bb20 | 4908 | err = btrfs_end_transaction(trans); |
5d13a37b AJ |
4909 | if (err && !ret) |
4910 | ret = err; | |
4911 | ||
4912 | out: | |
4913 | kfree(sa); | |
905b0dda MX |
4914 | drop_write: |
4915 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4916 | return ret; |
4917 | } | |
4918 | ||
905b0dda | 4919 | static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) |
5d13a37b | 4920 | { |
0b246afa JM |
4921 | struct inode *inode = file_inode(file); |
4922 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
4923 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5d13a37b AJ |
4924 | struct btrfs_ioctl_qgroup_create_args *sa; |
4925 | struct btrfs_trans_handle *trans; | |
4926 | int ret; | |
4927 | int err; | |
4928 | ||
4929 | if (!capable(CAP_SYS_ADMIN)) | |
4930 | return -EPERM; | |
4931 | ||
905b0dda MX |
4932 | ret = mnt_want_write_file(file); |
4933 | if (ret) | |
4934 | return ret; | |
5d13a37b AJ |
4935 | |
4936 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4937 | if (IS_ERR(sa)) { |
4938 | ret = PTR_ERR(sa); | |
4939 | goto drop_write; | |
4940 | } | |
5d13a37b | 4941 | |
d86e56cf MX |
4942 | if (!sa->qgroupid) { |
4943 | ret = -EINVAL; | |
4944 | goto out; | |
4945 | } | |
4946 | ||
5d13a37b AJ |
4947 | trans = btrfs_join_transaction(root); |
4948 | if (IS_ERR(trans)) { | |
4949 | ret = PTR_ERR(trans); | |
4950 | goto out; | |
4951 | } | |
4952 | ||
5d13a37b | 4953 | if (sa->create) { |
0b246afa | 4954 | ret = btrfs_create_qgroup(trans, fs_info, sa->qgroupid); |
5d13a37b | 4955 | } else { |
0b246afa | 4956 | ret = btrfs_remove_qgroup(trans, fs_info, sa->qgroupid); |
5d13a37b AJ |
4957 | } |
4958 | ||
3a45bb20 | 4959 | err = btrfs_end_transaction(trans); |
5d13a37b AJ |
4960 | if (err && !ret) |
4961 | ret = err; | |
4962 | ||
4963 | out: | |
4964 | kfree(sa); | |
905b0dda MX |
4965 | drop_write: |
4966 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4967 | return ret; |
4968 | } | |
4969 | ||
905b0dda | 4970 | static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) |
5d13a37b | 4971 | { |
0b246afa JM |
4972 | struct inode *inode = file_inode(file); |
4973 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
4974 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5d13a37b AJ |
4975 | struct btrfs_ioctl_qgroup_limit_args *sa; |
4976 | struct btrfs_trans_handle *trans; | |
4977 | int ret; | |
4978 | int err; | |
4979 | u64 qgroupid; | |
4980 | ||
4981 | if (!capable(CAP_SYS_ADMIN)) | |
4982 | return -EPERM; | |
4983 | ||
905b0dda MX |
4984 | ret = mnt_want_write_file(file); |
4985 | if (ret) | |
4986 | return ret; | |
5d13a37b AJ |
4987 | |
4988 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4989 | if (IS_ERR(sa)) { |
4990 | ret = PTR_ERR(sa); | |
4991 | goto drop_write; | |
4992 | } | |
5d13a37b AJ |
4993 | |
4994 | trans = btrfs_join_transaction(root); | |
4995 | if (IS_ERR(trans)) { | |
4996 | ret = PTR_ERR(trans); | |
4997 | goto out; | |
4998 | } | |
4999 | ||
5000 | qgroupid = sa->qgroupid; | |
5001 | if (!qgroupid) { | |
5002 | /* take the current subvol as qgroup */ | |
5003 | qgroupid = root->root_key.objectid; | |
5004 | } | |
5005 | ||
0b246afa | 5006 | ret = btrfs_limit_qgroup(trans, fs_info, qgroupid, &sa->lim); |
5d13a37b | 5007 | |
3a45bb20 | 5008 | err = btrfs_end_transaction(trans); |
5d13a37b AJ |
5009 | if (err && !ret) |
5010 | ret = err; | |
5011 | ||
5012 | out: | |
5013 | kfree(sa); | |
905b0dda MX |
5014 | drop_write: |
5015 | mnt_drop_write_file(file); | |
5d13a37b AJ |
5016 | return ret; |
5017 | } | |
5018 | ||
2f232036 JS |
5019 | static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) |
5020 | { | |
0b246afa JM |
5021 | struct inode *inode = file_inode(file); |
5022 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
2f232036 JS |
5023 | struct btrfs_ioctl_quota_rescan_args *qsa; |
5024 | int ret; | |
5025 | ||
5026 | if (!capable(CAP_SYS_ADMIN)) | |
5027 | return -EPERM; | |
5028 | ||
5029 | ret = mnt_want_write_file(file); | |
5030 | if (ret) | |
5031 | return ret; | |
5032 | ||
5033 | qsa = memdup_user(arg, sizeof(*qsa)); | |
5034 | if (IS_ERR(qsa)) { | |
5035 | ret = PTR_ERR(qsa); | |
5036 | goto drop_write; | |
5037 | } | |
5038 | ||
5039 | if (qsa->flags) { | |
5040 | ret = -EINVAL; | |
5041 | goto out; | |
5042 | } | |
5043 | ||
0b246afa | 5044 | ret = btrfs_qgroup_rescan(fs_info); |
2f232036 JS |
5045 | |
5046 | out: | |
5047 | kfree(qsa); | |
5048 | drop_write: | |
5049 | mnt_drop_write_file(file); | |
5050 | return ret; | |
5051 | } | |
5052 | ||
5053 | static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) | |
5054 | { | |
0b246afa JM |
5055 | struct inode *inode = file_inode(file); |
5056 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
2f232036 JS |
5057 | struct btrfs_ioctl_quota_rescan_args *qsa; |
5058 | int ret = 0; | |
5059 | ||
5060 | if (!capable(CAP_SYS_ADMIN)) | |
5061 | return -EPERM; | |
5062 | ||
8d2db785 | 5063 | qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); |
2f232036 JS |
5064 | if (!qsa) |
5065 | return -ENOMEM; | |
5066 | ||
0b246afa | 5067 | if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { |
2f232036 | 5068 | qsa->flags = 1; |
0b246afa | 5069 | qsa->progress = fs_info->qgroup_rescan_progress.objectid; |
2f232036 JS |
5070 | } |
5071 | ||
5072 | if (copy_to_user(arg, qsa, sizeof(*qsa))) | |
5073 | ret = -EFAULT; | |
5074 | ||
5075 | kfree(qsa); | |
5076 | return ret; | |
5077 | } | |
5078 | ||
57254b6e JS |
5079 | static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) |
5080 | { | |
0b246afa JM |
5081 | struct inode *inode = file_inode(file); |
5082 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
57254b6e JS |
5083 | |
5084 | if (!capable(CAP_SYS_ADMIN)) | |
5085 | return -EPERM; | |
5086 | ||
0b246afa | 5087 | return btrfs_qgroup_wait_for_completion(fs_info, true); |
57254b6e JS |
5088 | } |
5089 | ||
abccd00f HM |
5090 | static long _btrfs_ioctl_set_received_subvol(struct file *file, |
5091 | struct btrfs_ioctl_received_subvol_args *sa) | |
8ea05e3a | 5092 | { |
496ad9aa | 5093 | struct inode *inode = file_inode(file); |
0b246afa | 5094 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
8ea05e3a AB |
5095 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5096 | struct btrfs_root_item *root_item = &root->root_item; | |
5097 | struct btrfs_trans_handle *trans; | |
c2050a45 | 5098 | struct timespec ct = current_time(inode); |
8ea05e3a | 5099 | int ret = 0; |
dd5f9615 | 5100 | int received_uuid_changed; |
8ea05e3a | 5101 | |
bd60ea0f DS |
5102 | if (!inode_owner_or_capable(inode)) |
5103 | return -EPERM; | |
5104 | ||
8ea05e3a AB |
5105 | ret = mnt_want_write_file(file); |
5106 | if (ret < 0) | |
5107 | return ret; | |
5108 | ||
0b246afa | 5109 | down_write(&fs_info->subvol_sem); |
8ea05e3a | 5110 | |
4a0cc7ca | 5111 | if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { |
8ea05e3a AB |
5112 | ret = -EINVAL; |
5113 | goto out; | |
5114 | } | |
5115 | ||
5116 | if (btrfs_root_readonly(root)) { | |
5117 | ret = -EROFS; | |
5118 | goto out; | |
5119 | } | |
5120 | ||
dd5f9615 SB |
5121 | /* |
5122 | * 1 - root item | |
5123 | * 2 - uuid items (received uuid + subvol uuid) | |
5124 | */ | |
5125 | trans = btrfs_start_transaction(root, 3); | |
8ea05e3a AB |
5126 | if (IS_ERR(trans)) { |
5127 | ret = PTR_ERR(trans); | |
5128 | trans = NULL; | |
5129 | goto out; | |
5130 | } | |
5131 | ||
5132 | sa->rtransid = trans->transid; | |
5133 | sa->rtime.sec = ct.tv_sec; | |
5134 | sa->rtime.nsec = ct.tv_nsec; | |
5135 | ||
dd5f9615 SB |
5136 | received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, |
5137 | BTRFS_UUID_SIZE); | |
5138 | if (received_uuid_changed && | |
5139 | !btrfs_is_empty_uuid(root_item->received_uuid)) | |
0b246afa | 5140 | btrfs_uuid_tree_rem(trans, fs_info, root_item->received_uuid, |
dd5f9615 SB |
5141 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, |
5142 | root->root_key.objectid); | |
8ea05e3a AB |
5143 | memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); |
5144 | btrfs_set_root_stransid(root_item, sa->stransid); | |
5145 | btrfs_set_root_rtransid(root_item, sa->rtransid); | |
3cae210f QW |
5146 | btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); |
5147 | btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); | |
5148 | btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); | |
5149 | btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); | |
8ea05e3a | 5150 | |
0b246afa | 5151 | ret = btrfs_update_root(trans, fs_info->tree_root, |
8ea05e3a AB |
5152 | &root->root_key, &root->root_item); |
5153 | if (ret < 0) { | |
3a45bb20 | 5154 | btrfs_end_transaction(trans); |
8ea05e3a | 5155 | goto out; |
dd5f9615 SB |
5156 | } |
5157 | if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { | |
0b246afa | 5158 | ret = btrfs_uuid_tree_add(trans, fs_info, sa->uuid, |
dd5f9615 SB |
5159 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, |
5160 | root->root_key.objectid); | |
5161 | if (ret < 0 && ret != -EEXIST) { | |
66642832 | 5162 | btrfs_abort_transaction(trans, ret); |
8ea05e3a | 5163 | goto out; |
dd5f9615 SB |
5164 | } |
5165 | } | |
3a45bb20 | 5166 | ret = btrfs_commit_transaction(trans); |
dd5f9615 | 5167 | if (ret < 0) { |
66642832 | 5168 | btrfs_abort_transaction(trans, ret); |
dd5f9615 | 5169 | goto out; |
8ea05e3a AB |
5170 | } |
5171 | ||
abccd00f | 5172 | out: |
0b246afa | 5173 | up_write(&fs_info->subvol_sem); |
abccd00f HM |
5174 | mnt_drop_write_file(file); |
5175 | return ret; | |
5176 | } | |
5177 | ||
5178 | #ifdef CONFIG_64BIT | |
5179 | static long btrfs_ioctl_set_received_subvol_32(struct file *file, | |
5180 | void __user *arg) | |
5181 | { | |
5182 | struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; | |
5183 | struct btrfs_ioctl_received_subvol_args *args64 = NULL; | |
5184 | int ret = 0; | |
5185 | ||
5186 | args32 = memdup_user(arg, sizeof(*args32)); | |
7b9ea627 SV |
5187 | if (IS_ERR(args32)) |
5188 | return PTR_ERR(args32); | |
abccd00f | 5189 | |
8d2db785 | 5190 | args64 = kmalloc(sizeof(*args64), GFP_KERNEL); |
84dbeb87 DC |
5191 | if (!args64) { |
5192 | ret = -ENOMEM; | |
abccd00f HM |
5193 | goto out; |
5194 | } | |
5195 | ||
5196 | memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); | |
5197 | args64->stransid = args32->stransid; | |
5198 | args64->rtransid = args32->rtransid; | |
5199 | args64->stime.sec = args32->stime.sec; | |
5200 | args64->stime.nsec = args32->stime.nsec; | |
5201 | args64->rtime.sec = args32->rtime.sec; | |
5202 | args64->rtime.nsec = args32->rtime.nsec; | |
5203 | args64->flags = args32->flags; | |
5204 | ||
5205 | ret = _btrfs_ioctl_set_received_subvol(file, args64); | |
5206 | if (ret) | |
5207 | goto out; | |
5208 | ||
5209 | memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); | |
5210 | args32->stransid = args64->stransid; | |
5211 | args32->rtransid = args64->rtransid; | |
5212 | args32->stime.sec = args64->stime.sec; | |
5213 | args32->stime.nsec = args64->stime.nsec; | |
5214 | args32->rtime.sec = args64->rtime.sec; | |
5215 | args32->rtime.nsec = args64->rtime.nsec; | |
5216 | args32->flags = args64->flags; | |
5217 | ||
5218 | ret = copy_to_user(arg, args32, sizeof(*args32)); | |
5219 | if (ret) | |
5220 | ret = -EFAULT; | |
5221 | ||
5222 | out: | |
5223 | kfree(args32); | |
5224 | kfree(args64); | |
5225 | return ret; | |
5226 | } | |
5227 | #endif | |
5228 | ||
5229 | static long btrfs_ioctl_set_received_subvol(struct file *file, | |
5230 | void __user *arg) | |
5231 | { | |
5232 | struct btrfs_ioctl_received_subvol_args *sa = NULL; | |
5233 | int ret = 0; | |
5234 | ||
5235 | sa = memdup_user(arg, sizeof(*sa)); | |
7b9ea627 SV |
5236 | if (IS_ERR(sa)) |
5237 | return PTR_ERR(sa); | |
abccd00f HM |
5238 | |
5239 | ret = _btrfs_ioctl_set_received_subvol(file, sa); | |
5240 | ||
5241 | if (ret) | |
5242 | goto out; | |
5243 | ||
8ea05e3a AB |
5244 | ret = copy_to_user(arg, sa, sizeof(*sa)); |
5245 | if (ret) | |
5246 | ret = -EFAULT; | |
5247 | ||
5248 | out: | |
5249 | kfree(sa); | |
8ea05e3a AB |
5250 | return ret; |
5251 | } | |
5252 | ||
867ab667 | 5253 | static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) |
5254 | { | |
0b246afa JM |
5255 | struct inode *inode = file_inode(file); |
5256 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
a1b83ac5 | 5257 | size_t len; |
867ab667 | 5258 | int ret; |
a1b83ac5 AJ |
5259 | char label[BTRFS_LABEL_SIZE]; |
5260 | ||
0b246afa JM |
5261 | spin_lock(&fs_info->super_lock); |
5262 | memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); | |
5263 | spin_unlock(&fs_info->super_lock); | |
a1b83ac5 AJ |
5264 | |
5265 | len = strnlen(label, BTRFS_LABEL_SIZE); | |
867ab667 | 5266 | |
5267 | if (len == BTRFS_LABEL_SIZE) { | |
0b246afa JM |
5268 | btrfs_warn(fs_info, |
5269 | "label is too long, return the first %zu bytes", | |
5270 | --len); | |
867ab667 | 5271 | } |
5272 | ||
867ab667 | 5273 | ret = copy_to_user(arg, label, len); |
867ab667 | 5274 | |
5275 | return ret ? -EFAULT : 0; | |
5276 | } | |
5277 | ||
a8bfd4ab | 5278 | static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) |
5279 | { | |
0b246afa JM |
5280 | struct inode *inode = file_inode(file); |
5281 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
5282 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5283 | struct btrfs_super_block *super_block = fs_info->super_copy; | |
a8bfd4ab | 5284 | struct btrfs_trans_handle *trans; |
5285 | char label[BTRFS_LABEL_SIZE]; | |
5286 | int ret; | |
5287 | ||
5288 | if (!capable(CAP_SYS_ADMIN)) | |
5289 | return -EPERM; | |
5290 | ||
5291 | if (copy_from_user(label, arg, sizeof(label))) | |
5292 | return -EFAULT; | |
5293 | ||
5294 | if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { | |
0b246afa | 5295 | btrfs_err(fs_info, |
5d163e0e JM |
5296 | "unable to set label with more than %d bytes", |
5297 | BTRFS_LABEL_SIZE - 1); | |
a8bfd4ab | 5298 | return -EINVAL; |
5299 | } | |
5300 | ||
5301 | ret = mnt_want_write_file(file); | |
5302 | if (ret) | |
5303 | return ret; | |
5304 | ||
a8bfd4ab | 5305 | trans = btrfs_start_transaction(root, 0); |
5306 | if (IS_ERR(trans)) { | |
5307 | ret = PTR_ERR(trans); | |
5308 | goto out_unlock; | |
5309 | } | |
5310 | ||
0b246afa | 5311 | spin_lock(&fs_info->super_lock); |
a8bfd4ab | 5312 | strcpy(super_block->label, label); |
0b246afa | 5313 | spin_unlock(&fs_info->super_lock); |
3a45bb20 | 5314 | ret = btrfs_commit_transaction(trans); |
a8bfd4ab | 5315 | |
5316 | out_unlock: | |
a8bfd4ab | 5317 | mnt_drop_write_file(file); |
5318 | return ret; | |
5319 | } | |
5320 | ||
2eaa055f JM |
5321 | #define INIT_FEATURE_FLAGS(suffix) \ |
5322 | { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ | |
5323 | .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ | |
5324 | .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } | |
5325 | ||
d5131b65 | 5326 | int btrfs_ioctl_get_supported_features(void __user *arg) |
2eaa055f | 5327 | { |
4d4ab6d6 | 5328 | static const struct btrfs_ioctl_feature_flags features[3] = { |
2eaa055f JM |
5329 | INIT_FEATURE_FLAGS(SUPP), |
5330 | INIT_FEATURE_FLAGS(SAFE_SET), | |
5331 | INIT_FEATURE_FLAGS(SAFE_CLEAR) | |
5332 | }; | |
5333 | ||
5334 | if (copy_to_user(arg, &features, sizeof(features))) | |
5335 | return -EFAULT; | |
5336 | ||
5337 | return 0; | |
5338 | } | |
5339 | ||
5340 | static int btrfs_ioctl_get_features(struct file *file, void __user *arg) | |
5341 | { | |
0b246afa JM |
5342 | struct inode *inode = file_inode(file); |
5343 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
5344 | struct btrfs_super_block *super_block = fs_info->super_copy; | |
2eaa055f JM |
5345 | struct btrfs_ioctl_feature_flags features; |
5346 | ||
5347 | features.compat_flags = btrfs_super_compat_flags(super_block); | |
5348 | features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); | |
5349 | features.incompat_flags = btrfs_super_incompat_flags(super_block); | |
5350 | ||
5351 | if (copy_to_user(arg, &features, sizeof(features))) | |
5352 | return -EFAULT; | |
5353 | ||
5354 | return 0; | |
5355 | } | |
5356 | ||
2ff7e61e | 5357 | static int check_feature_bits(struct btrfs_fs_info *fs_info, |
3b02a68a | 5358 | enum btrfs_feature_set set, |
2eaa055f JM |
5359 | u64 change_mask, u64 flags, u64 supported_flags, |
5360 | u64 safe_set, u64 safe_clear) | |
5361 | { | |
3b02a68a JM |
5362 | const char *type = btrfs_feature_set_names[set]; |
5363 | char *names; | |
2eaa055f JM |
5364 | u64 disallowed, unsupported; |
5365 | u64 set_mask = flags & change_mask; | |
5366 | u64 clear_mask = ~flags & change_mask; | |
5367 | ||
5368 | unsupported = set_mask & ~supported_flags; | |
5369 | if (unsupported) { | |
3b02a68a JM |
5370 | names = btrfs_printable_features(set, unsupported); |
5371 | if (names) { | |
0b246afa JM |
5372 | btrfs_warn(fs_info, |
5373 | "this kernel does not support the %s feature bit%s", | |
5374 | names, strchr(names, ',') ? "s" : ""); | |
3b02a68a JM |
5375 | kfree(names); |
5376 | } else | |
0b246afa JM |
5377 | btrfs_warn(fs_info, |
5378 | "this kernel does not support %s bits 0x%llx", | |
5379 | type, unsupported); | |
2eaa055f JM |
5380 | return -EOPNOTSUPP; |
5381 | } | |
5382 | ||
5383 | disallowed = set_mask & ~safe_set; | |
5384 | if (disallowed) { | |
3b02a68a JM |
5385 | names = btrfs_printable_features(set, disallowed); |
5386 | if (names) { | |
0b246afa JM |
5387 | btrfs_warn(fs_info, |
5388 | "can't set the %s feature bit%s while mounted", | |
5389 | names, strchr(names, ',') ? "s" : ""); | |
3b02a68a JM |
5390 | kfree(names); |
5391 | } else | |
0b246afa JM |
5392 | btrfs_warn(fs_info, |
5393 | "can't set %s bits 0x%llx while mounted", | |
5394 | type, disallowed); | |
2eaa055f JM |
5395 | return -EPERM; |
5396 | } | |
5397 | ||
5398 | disallowed = clear_mask & ~safe_clear; | |
5399 | if (disallowed) { | |
3b02a68a JM |
5400 | names = btrfs_printable_features(set, disallowed); |
5401 | if (names) { | |
0b246afa JM |
5402 | btrfs_warn(fs_info, |
5403 | "can't clear the %s feature bit%s while mounted", | |
5404 | names, strchr(names, ',') ? "s" : ""); | |
3b02a68a JM |
5405 | kfree(names); |
5406 | } else | |
0b246afa JM |
5407 | btrfs_warn(fs_info, |
5408 | "can't clear %s bits 0x%llx while mounted", | |
5409 | type, disallowed); | |
2eaa055f JM |
5410 | return -EPERM; |
5411 | } | |
5412 | ||
5413 | return 0; | |
5414 | } | |
5415 | ||
2ff7e61e JM |
5416 | #define check_feature(fs_info, change_mask, flags, mask_base) \ |
5417 | check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ | |
2eaa055f JM |
5418 | BTRFS_FEATURE_ ## mask_base ## _SUPP, \ |
5419 | BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ | |
5420 | BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) | |
5421 | ||
5422 | static int btrfs_ioctl_set_features(struct file *file, void __user *arg) | |
5423 | { | |
0b246afa JM |
5424 | struct inode *inode = file_inode(file); |
5425 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
5426 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5427 | struct btrfs_super_block *super_block = fs_info->super_copy; | |
2eaa055f JM |
5428 | struct btrfs_ioctl_feature_flags flags[2]; |
5429 | struct btrfs_trans_handle *trans; | |
5430 | u64 newflags; | |
5431 | int ret; | |
5432 | ||
5433 | if (!capable(CAP_SYS_ADMIN)) | |
5434 | return -EPERM; | |
5435 | ||
5436 | if (copy_from_user(flags, arg, sizeof(flags))) | |
5437 | return -EFAULT; | |
5438 | ||
5439 | /* Nothing to do */ | |
5440 | if (!flags[0].compat_flags && !flags[0].compat_ro_flags && | |
5441 | !flags[0].incompat_flags) | |
5442 | return 0; | |
5443 | ||
2ff7e61e | 5444 | ret = check_feature(fs_info, flags[0].compat_flags, |
2eaa055f JM |
5445 | flags[1].compat_flags, COMPAT); |
5446 | if (ret) | |
5447 | return ret; | |
5448 | ||
2ff7e61e | 5449 | ret = check_feature(fs_info, flags[0].compat_ro_flags, |
2eaa055f JM |
5450 | flags[1].compat_ro_flags, COMPAT_RO); |
5451 | if (ret) | |
5452 | return ret; | |
5453 | ||
2ff7e61e | 5454 | ret = check_feature(fs_info, flags[0].incompat_flags, |
2eaa055f JM |
5455 | flags[1].incompat_flags, INCOMPAT); |
5456 | if (ret) | |
5457 | return ret; | |
5458 | ||
7ab19625 DS |
5459 | ret = mnt_want_write_file(file); |
5460 | if (ret) | |
5461 | return ret; | |
5462 | ||
8051aa1a | 5463 | trans = btrfs_start_transaction(root, 0); |
7ab19625 DS |
5464 | if (IS_ERR(trans)) { |
5465 | ret = PTR_ERR(trans); | |
5466 | goto out_drop_write; | |
5467 | } | |
2eaa055f | 5468 | |
0b246afa | 5469 | spin_lock(&fs_info->super_lock); |
2eaa055f JM |
5470 | newflags = btrfs_super_compat_flags(super_block); |
5471 | newflags |= flags[0].compat_flags & flags[1].compat_flags; | |
5472 | newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); | |
5473 | btrfs_set_super_compat_flags(super_block, newflags); | |
5474 | ||
5475 | newflags = btrfs_super_compat_ro_flags(super_block); | |
5476 | newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; | |
5477 | newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); | |
5478 | btrfs_set_super_compat_ro_flags(super_block, newflags); | |
5479 | ||
5480 | newflags = btrfs_super_incompat_flags(super_block); | |
5481 | newflags |= flags[0].incompat_flags & flags[1].incompat_flags; | |
5482 | newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); | |
5483 | btrfs_set_super_incompat_flags(super_block, newflags); | |
0b246afa | 5484 | spin_unlock(&fs_info->super_lock); |
2eaa055f | 5485 | |
3a45bb20 | 5486 | ret = btrfs_commit_transaction(trans); |
7ab19625 DS |
5487 | out_drop_write: |
5488 | mnt_drop_write_file(file); | |
5489 | ||
5490 | return ret; | |
2eaa055f JM |
5491 | } |
5492 | ||
f46b5a66 CH |
5493 | long btrfs_ioctl(struct file *file, unsigned int |
5494 | cmd, unsigned long arg) | |
5495 | { | |
0b246afa JM |
5496 | struct inode *inode = file_inode(file); |
5497 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
5498 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4bcabaa3 | 5499 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
5500 | |
5501 | switch (cmd) { | |
6cbff00f CH |
5502 | case FS_IOC_GETFLAGS: |
5503 | return btrfs_ioctl_getflags(file, argp); | |
5504 | case FS_IOC_SETFLAGS: | |
5505 | return btrfs_ioctl_setflags(file, argp); | |
5506 | case FS_IOC_GETVERSION: | |
5507 | return btrfs_ioctl_getversion(file, argp); | |
f7039b1d LD |
5508 | case FITRIM: |
5509 | return btrfs_ioctl_fitrim(file, argp); | |
f46b5a66 | 5510 | case BTRFS_IOC_SNAP_CREATE: |
fa0d2b9b | 5511 | return btrfs_ioctl_snap_create(file, argp, 0); |
fdfb1e4f | 5512 | case BTRFS_IOC_SNAP_CREATE_V2: |
fa0d2b9b | 5513 | return btrfs_ioctl_snap_create_v2(file, argp, 0); |
3de4586c | 5514 | case BTRFS_IOC_SUBVOL_CREATE: |
fa0d2b9b | 5515 | return btrfs_ioctl_snap_create(file, argp, 1); |
6f72c7e2 AJ |
5516 | case BTRFS_IOC_SUBVOL_CREATE_V2: |
5517 | return btrfs_ioctl_snap_create_v2(file, argp, 1); | |
76dda93c YZ |
5518 | case BTRFS_IOC_SNAP_DESTROY: |
5519 | return btrfs_ioctl_snap_destroy(file, argp); | |
0caa102d LZ |
5520 | case BTRFS_IOC_SUBVOL_GETFLAGS: |
5521 | return btrfs_ioctl_subvol_getflags(file, argp); | |
5522 | case BTRFS_IOC_SUBVOL_SETFLAGS: | |
5523 | return btrfs_ioctl_subvol_setflags(file, argp); | |
6ef5ed0d JB |
5524 | case BTRFS_IOC_DEFAULT_SUBVOL: |
5525 | return btrfs_ioctl_default_subvol(file, argp); | |
f46b5a66 | 5526 | case BTRFS_IOC_DEFRAG: |
1e701a32 CM |
5527 | return btrfs_ioctl_defrag(file, NULL); |
5528 | case BTRFS_IOC_DEFRAG_RANGE: | |
5529 | return btrfs_ioctl_defrag(file, argp); | |
f46b5a66 | 5530 | case BTRFS_IOC_RESIZE: |
198605a8 | 5531 | return btrfs_ioctl_resize(file, argp); |
f46b5a66 | 5532 | case BTRFS_IOC_ADD_DEV: |
2ff7e61e | 5533 | return btrfs_ioctl_add_dev(fs_info, argp); |
f46b5a66 | 5534 | case BTRFS_IOC_RM_DEV: |
da24927b | 5535 | return btrfs_ioctl_rm_dev(file, argp); |
6b526ed7 AJ |
5536 | case BTRFS_IOC_RM_DEV_V2: |
5537 | return btrfs_ioctl_rm_dev_v2(file, argp); | |
475f6387 | 5538 | case BTRFS_IOC_FS_INFO: |
2ff7e61e | 5539 | return btrfs_ioctl_fs_info(fs_info, argp); |
475f6387 | 5540 | case BTRFS_IOC_DEV_INFO: |
2ff7e61e | 5541 | return btrfs_ioctl_dev_info(fs_info, argp); |
f46b5a66 | 5542 | case BTRFS_IOC_BALANCE: |
9ba1f6e4 | 5543 | return btrfs_ioctl_balance(file, NULL); |
f46b5a66 CH |
5544 | case BTRFS_IOC_TRANS_START: |
5545 | return btrfs_ioctl_trans_start(file); | |
5546 | case BTRFS_IOC_TRANS_END: | |
5547 | return btrfs_ioctl_trans_end(file); | |
ac8e9819 CM |
5548 | case BTRFS_IOC_TREE_SEARCH: |
5549 | return btrfs_ioctl_tree_search(file, argp); | |
cc68a8a5 GH |
5550 | case BTRFS_IOC_TREE_SEARCH_V2: |
5551 | return btrfs_ioctl_tree_search_v2(file, argp); | |
ac8e9819 CM |
5552 | case BTRFS_IOC_INO_LOOKUP: |
5553 | return btrfs_ioctl_ino_lookup(file, argp); | |
d7728c96 JS |
5554 | case BTRFS_IOC_INO_PATHS: |
5555 | return btrfs_ioctl_ino_to_path(root, argp); | |
5556 | case BTRFS_IOC_LOGICAL_INO: | |
2ff7e61e | 5557 | return btrfs_ioctl_logical_to_ino(fs_info, argp); |
1406e432 | 5558 | case BTRFS_IOC_SPACE_INFO: |
2ff7e61e | 5559 | return btrfs_ioctl_space_info(fs_info, argp); |
9b199859 FDBM |
5560 | case BTRFS_IOC_SYNC: { |
5561 | int ret; | |
5562 | ||
0b246afa | 5563 | ret = btrfs_start_delalloc_roots(fs_info, 0, -1); |
9b199859 FDBM |
5564 | if (ret) |
5565 | return ret; | |
0b246afa | 5566 | ret = btrfs_sync_fs(inode->i_sb, 1); |
2fad4e83 DS |
5567 | /* |
5568 | * The transaction thread may want to do more work, | |
01327610 | 5569 | * namely it pokes the cleaner kthread that will start |
2fad4e83 DS |
5570 | * processing uncleaned subvols. |
5571 | */ | |
0b246afa | 5572 | wake_up_process(fs_info->transaction_kthread); |
9b199859 FDBM |
5573 | return ret; |
5574 | } | |
46204592 | 5575 | case BTRFS_IOC_START_SYNC: |
9a8c28be | 5576 | return btrfs_ioctl_start_sync(root, argp); |
46204592 | 5577 | case BTRFS_IOC_WAIT_SYNC: |
2ff7e61e | 5578 | return btrfs_ioctl_wait_sync(fs_info, argp); |
475f6387 | 5579 | case BTRFS_IOC_SCRUB: |
b8e95489 | 5580 | return btrfs_ioctl_scrub(file, argp); |
475f6387 | 5581 | case BTRFS_IOC_SCRUB_CANCEL: |
2ff7e61e | 5582 | return btrfs_ioctl_scrub_cancel(fs_info); |
475f6387 | 5583 | case BTRFS_IOC_SCRUB_PROGRESS: |
2ff7e61e | 5584 | return btrfs_ioctl_scrub_progress(fs_info, argp); |
c9e9f97b | 5585 | case BTRFS_IOC_BALANCE_V2: |
9ba1f6e4 | 5586 | return btrfs_ioctl_balance(file, argp); |
837d5b6e | 5587 | case BTRFS_IOC_BALANCE_CTL: |
2ff7e61e | 5588 | return btrfs_ioctl_balance_ctl(fs_info, arg); |
19a39dce | 5589 | case BTRFS_IOC_BALANCE_PROGRESS: |
2ff7e61e | 5590 | return btrfs_ioctl_balance_progress(fs_info, argp); |
8ea05e3a AB |
5591 | case BTRFS_IOC_SET_RECEIVED_SUBVOL: |
5592 | return btrfs_ioctl_set_received_subvol(file, argp); | |
abccd00f HM |
5593 | #ifdef CONFIG_64BIT |
5594 | case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: | |
5595 | return btrfs_ioctl_set_received_subvol_32(file, argp); | |
5596 | #endif | |
31db9f7c AB |
5597 | case BTRFS_IOC_SEND: |
5598 | return btrfs_ioctl_send(file, argp); | |
c11d2c23 | 5599 | case BTRFS_IOC_GET_DEV_STATS: |
2ff7e61e | 5600 | return btrfs_ioctl_get_dev_stats(fs_info, argp); |
5d13a37b | 5601 | case BTRFS_IOC_QUOTA_CTL: |
905b0dda | 5602 | return btrfs_ioctl_quota_ctl(file, argp); |
5d13a37b | 5603 | case BTRFS_IOC_QGROUP_ASSIGN: |
905b0dda | 5604 | return btrfs_ioctl_qgroup_assign(file, argp); |
5d13a37b | 5605 | case BTRFS_IOC_QGROUP_CREATE: |
905b0dda | 5606 | return btrfs_ioctl_qgroup_create(file, argp); |
5d13a37b | 5607 | case BTRFS_IOC_QGROUP_LIMIT: |
905b0dda | 5608 | return btrfs_ioctl_qgroup_limit(file, argp); |
2f232036 JS |
5609 | case BTRFS_IOC_QUOTA_RESCAN: |
5610 | return btrfs_ioctl_quota_rescan(file, argp); | |
5611 | case BTRFS_IOC_QUOTA_RESCAN_STATUS: | |
5612 | return btrfs_ioctl_quota_rescan_status(file, argp); | |
57254b6e JS |
5613 | case BTRFS_IOC_QUOTA_RESCAN_WAIT: |
5614 | return btrfs_ioctl_quota_rescan_wait(file, argp); | |
3f6bcfbd | 5615 | case BTRFS_IOC_DEV_REPLACE: |
2ff7e61e | 5616 | return btrfs_ioctl_dev_replace(fs_info, argp); |
867ab667 | 5617 | case BTRFS_IOC_GET_FSLABEL: |
5618 | return btrfs_ioctl_get_fslabel(file, argp); | |
a8bfd4ab | 5619 | case BTRFS_IOC_SET_FSLABEL: |
5620 | return btrfs_ioctl_set_fslabel(file, argp); | |
2eaa055f | 5621 | case BTRFS_IOC_GET_SUPPORTED_FEATURES: |
d5131b65 | 5622 | return btrfs_ioctl_get_supported_features(argp); |
2eaa055f JM |
5623 | case BTRFS_IOC_GET_FEATURES: |
5624 | return btrfs_ioctl_get_features(file, argp); | |
5625 | case BTRFS_IOC_SET_FEATURES: | |
5626 | return btrfs_ioctl_set_features(file, argp); | |
f46b5a66 CH |
5627 | } |
5628 | ||
5629 | return -ENOTTY; | |
5630 | } | |
4c63c245 LD |
5631 | |
5632 | #ifdef CONFIG_COMPAT | |
5633 | long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
5634 | { | |
2a362249 JM |
5635 | /* |
5636 | * These all access 32-bit values anyway so no further | |
5637 | * handling is necessary. | |
5638 | */ | |
4c63c245 LD |
5639 | switch (cmd) { |
5640 | case FS_IOC32_GETFLAGS: | |
5641 | cmd = FS_IOC_GETFLAGS; | |
5642 | break; | |
5643 | case FS_IOC32_SETFLAGS: | |
5644 | cmd = FS_IOC_SETFLAGS; | |
5645 | break; | |
5646 | case FS_IOC32_GETVERSION: | |
5647 | cmd = FS_IOC_GETVERSION; | |
5648 | break; | |
4c63c245 LD |
5649 | } |
5650 | ||
5651 | return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); | |
5652 | } | |
5653 | #endif |