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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> | |
36 | #include <linux/statfs.h> | |
37 | #include <linux/compat.h> | |
38 | #include <linux/bit_spinlock.h> | |
cb8e7090 | 39 | #include <linux/security.h> |
f46b5a66 | 40 | #include <linux/xattr.h> |
7ea394f1 | 41 | #include <linux/vmalloc.h> |
5a0e3ad6 | 42 | #include <linux/slab.h> |
f7039b1d | 43 | #include <linux/blkdev.h> |
8ea05e3a | 44 | #include <linux/uuid.h> |
55e301fd | 45 | #include <linux/btrfs.h> |
416161db | 46 | #include <linux/uaccess.h> |
f46b5a66 CH |
47 | #include "ctree.h" |
48 | #include "disk-io.h" | |
49 | #include "transaction.h" | |
50 | #include "btrfs_inode.h" | |
f46b5a66 CH |
51 | #include "print-tree.h" |
52 | #include "volumes.h" | |
925baedd | 53 | #include "locking.h" |
581bb050 | 54 | #include "inode-map.h" |
d7728c96 | 55 | #include "backref.h" |
606686ee | 56 | #include "rcu-string.h" |
31db9f7c | 57 | #include "send.h" |
3f6bcfbd | 58 | #include "dev-replace.h" |
63541927 | 59 | #include "props.h" |
3b02a68a | 60 | #include "sysfs.h" |
fcebe456 | 61 | #include "qgroup.h" |
1ec9a1ae | 62 | #include "tree-log.h" |
ebb8765b | 63 | #include "compression.h" |
f46b5a66 | 64 | |
abccd00f HM |
65 | #ifdef CONFIG_64BIT |
66 | /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI | |
67 | * structures are incorrect, as the timespec structure from userspace | |
68 | * is 4 bytes too small. We define these alternatives here to teach | |
69 | * the kernel about the 32-bit struct packing. | |
70 | */ | |
71 | struct btrfs_ioctl_timespec_32 { | |
72 | __u64 sec; | |
73 | __u32 nsec; | |
74 | } __attribute__ ((__packed__)); | |
75 | ||
76 | struct btrfs_ioctl_received_subvol_args_32 { | |
77 | char uuid[BTRFS_UUID_SIZE]; /* in */ | |
78 | __u64 stransid; /* in */ | |
79 | __u64 rtransid; /* out */ | |
80 | struct btrfs_ioctl_timespec_32 stime; /* in */ | |
81 | struct btrfs_ioctl_timespec_32 rtime; /* out */ | |
82 | __u64 flags; /* in */ | |
83 | __u64 reserved[16]; /* in */ | |
84 | } __attribute__ ((__packed__)); | |
85 | ||
86 | #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ | |
87 | struct btrfs_ioctl_received_subvol_args_32) | |
88 | #endif | |
89 | ||
90 | ||
416161db | 91 | static int btrfs_clone(struct inode *src, struct inode *inode, |
1c919a5e MF |
92 | u64 off, u64 olen, u64 olen_aligned, u64 destoff, |
93 | int no_time_update); | |
416161db | 94 | |
6cbff00f CH |
95 | /* Mask out flags that are inappropriate for the given type of inode. */ |
96 | static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) | |
97 | { | |
98 | if (S_ISDIR(mode)) | |
99 | return flags; | |
100 | else if (S_ISREG(mode)) | |
101 | return flags & ~FS_DIRSYNC_FL; | |
102 | else | |
103 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); | |
104 | } | |
105 | ||
106 | /* | |
107 | * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. | |
108 | */ | |
109 | static unsigned int btrfs_flags_to_ioctl(unsigned int flags) | |
110 | { | |
111 | unsigned int iflags = 0; | |
112 | ||
113 | if (flags & BTRFS_INODE_SYNC) | |
114 | iflags |= FS_SYNC_FL; | |
115 | if (flags & BTRFS_INODE_IMMUTABLE) | |
116 | iflags |= FS_IMMUTABLE_FL; | |
117 | if (flags & BTRFS_INODE_APPEND) | |
118 | iflags |= FS_APPEND_FL; | |
119 | if (flags & BTRFS_INODE_NODUMP) | |
120 | iflags |= FS_NODUMP_FL; | |
121 | if (flags & BTRFS_INODE_NOATIME) | |
122 | iflags |= FS_NOATIME_FL; | |
123 | if (flags & BTRFS_INODE_DIRSYNC) | |
124 | iflags |= FS_DIRSYNC_FL; | |
d0092bdd LZ |
125 | if (flags & BTRFS_INODE_NODATACOW) |
126 | iflags |= FS_NOCOW_FL; | |
127 | ||
13f48dc9 | 128 | if (flags & BTRFS_INODE_NOCOMPRESS) |
d0092bdd | 129 | iflags |= FS_NOCOMP_FL; |
13f48dc9 ST |
130 | else if (flags & BTRFS_INODE_COMPRESS) |
131 | iflags |= FS_COMPR_FL; | |
6cbff00f CH |
132 | |
133 | return iflags; | |
134 | } | |
135 | ||
136 | /* | |
137 | * Update inode->i_flags based on the btrfs internal flags. | |
138 | */ | |
139 | void btrfs_update_iflags(struct inode *inode) | |
140 | { | |
141 | struct btrfs_inode *ip = BTRFS_I(inode); | |
3cc79392 | 142 | unsigned int new_fl = 0; |
6cbff00f CH |
143 | |
144 | if (ip->flags & BTRFS_INODE_SYNC) | |
3cc79392 | 145 | new_fl |= S_SYNC; |
6cbff00f | 146 | if (ip->flags & BTRFS_INODE_IMMUTABLE) |
3cc79392 | 147 | new_fl |= S_IMMUTABLE; |
6cbff00f | 148 | if (ip->flags & BTRFS_INODE_APPEND) |
3cc79392 | 149 | new_fl |= S_APPEND; |
6cbff00f | 150 | if (ip->flags & BTRFS_INODE_NOATIME) |
3cc79392 | 151 | new_fl |= S_NOATIME; |
6cbff00f | 152 | if (ip->flags & BTRFS_INODE_DIRSYNC) |
3cc79392 FM |
153 | new_fl |= S_DIRSYNC; |
154 | ||
155 | set_mask_bits(&inode->i_flags, | |
156 | S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC, | |
157 | new_fl); | |
6cbff00f CH |
158 | } |
159 | ||
160 | /* | |
161 | * Inherit flags from the parent inode. | |
162 | * | |
e27425d6 | 163 | * Currently only the compression flags and the cow flags are inherited. |
6cbff00f CH |
164 | */ |
165 | void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) | |
166 | { | |
0b4dcea5 CM |
167 | unsigned int flags; |
168 | ||
169 | if (!dir) | |
170 | return; | |
171 | ||
172 | flags = BTRFS_I(dir)->flags; | |
6cbff00f | 173 | |
e27425d6 JB |
174 | if (flags & BTRFS_INODE_NOCOMPRESS) { |
175 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; | |
176 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; | |
177 | } else if (flags & BTRFS_INODE_COMPRESS) { | |
178 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
179 | BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; | |
180 | } | |
181 | ||
213490b3 | 182 | if (flags & BTRFS_INODE_NODATACOW) { |
e27425d6 | 183 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; |
213490b3 LB |
184 | if (S_ISREG(inode->i_mode)) |
185 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; | |
186 | } | |
6cbff00f | 187 | |
6cbff00f CH |
188 | btrfs_update_iflags(inode); |
189 | } | |
190 | ||
191 | static int btrfs_ioctl_getflags(struct file *file, void __user *arg) | |
192 | { | |
496ad9aa | 193 | struct btrfs_inode *ip = BTRFS_I(file_inode(file)); |
6cbff00f CH |
194 | unsigned int flags = btrfs_flags_to_ioctl(ip->flags); |
195 | ||
196 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
197 | return -EFAULT; | |
198 | return 0; | |
199 | } | |
200 | ||
75e7cb7f LB |
201 | static int check_flags(unsigned int flags) |
202 | { | |
203 | if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ | |
204 | FS_NOATIME_FL | FS_NODUMP_FL | \ | |
205 | FS_SYNC_FL | FS_DIRSYNC_FL | \ | |
e1e8fb6a LZ |
206 | FS_NOCOMP_FL | FS_COMPR_FL | |
207 | FS_NOCOW_FL)) | |
75e7cb7f LB |
208 | return -EOPNOTSUPP; |
209 | ||
210 | if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) | |
211 | return -EINVAL; | |
212 | ||
75e7cb7f LB |
213 | return 0; |
214 | } | |
215 | ||
6cbff00f CH |
216 | static int btrfs_ioctl_setflags(struct file *file, void __user *arg) |
217 | { | |
496ad9aa | 218 | struct inode *inode = file_inode(file); |
6cbff00f CH |
219 | struct btrfs_inode *ip = BTRFS_I(inode); |
220 | struct btrfs_root *root = ip->root; | |
221 | struct btrfs_trans_handle *trans; | |
222 | unsigned int flags, oldflags; | |
223 | int ret; | |
f062abf0 LZ |
224 | u64 ip_oldflags; |
225 | unsigned int i_oldflags; | |
7e97b8da | 226 | umode_t mode; |
6cbff00f | 227 | |
bd60ea0f DS |
228 | if (!inode_owner_or_capable(inode)) |
229 | return -EPERM; | |
230 | ||
b83cc969 LZ |
231 | if (btrfs_root_readonly(root)) |
232 | return -EROFS; | |
233 | ||
6cbff00f CH |
234 | if (copy_from_user(&flags, arg, sizeof(flags))) |
235 | return -EFAULT; | |
236 | ||
75e7cb7f LB |
237 | ret = check_flags(flags); |
238 | if (ret) | |
239 | return ret; | |
f46b5a66 | 240 | |
e7848683 JK |
241 | ret = mnt_want_write_file(file); |
242 | if (ret) | |
243 | return ret; | |
244 | ||
5955102c | 245 | inode_lock(inode); |
6cbff00f | 246 | |
f062abf0 LZ |
247 | ip_oldflags = ip->flags; |
248 | i_oldflags = inode->i_flags; | |
7e97b8da | 249 | mode = inode->i_mode; |
f062abf0 | 250 | |
6cbff00f CH |
251 | flags = btrfs_mask_flags(inode->i_mode, flags); |
252 | oldflags = btrfs_flags_to_ioctl(ip->flags); | |
253 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { | |
254 | if (!capable(CAP_LINUX_IMMUTABLE)) { | |
255 | ret = -EPERM; | |
256 | goto out_unlock; | |
257 | } | |
258 | } | |
259 | ||
6cbff00f CH |
260 | if (flags & FS_SYNC_FL) |
261 | ip->flags |= BTRFS_INODE_SYNC; | |
262 | else | |
263 | ip->flags &= ~BTRFS_INODE_SYNC; | |
264 | if (flags & FS_IMMUTABLE_FL) | |
265 | ip->flags |= BTRFS_INODE_IMMUTABLE; | |
266 | else | |
267 | ip->flags &= ~BTRFS_INODE_IMMUTABLE; | |
268 | if (flags & FS_APPEND_FL) | |
269 | ip->flags |= BTRFS_INODE_APPEND; | |
270 | else | |
271 | ip->flags &= ~BTRFS_INODE_APPEND; | |
272 | if (flags & FS_NODUMP_FL) | |
273 | ip->flags |= BTRFS_INODE_NODUMP; | |
274 | else | |
275 | ip->flags &= ~BTRFS_INODE_NODUMP; | |
276 | if (flags & FS_NOATIME_FL) | |
277 | ip->flags |= BTRFS_INODE_NOATIME; | |
278 | else | |
279 | ip->flags &= ~BTRFS_INODE_NOATIME; | |
280 | if (flags & FS_DIRSYNC_FL) | |
281 | ip->flags |= BTRFS_INODE_DIRSYNC; | |
282 | else | |
283 | ip->flags &= ~BTRFS_INODE_DIRSYNC; | |
7e97b8da DS |
284 | if (flags & FS_NOCOW_FL) { |
285 | if (S_ISREG(mode)) { | |
286 | /* | |
287 | * It's safe to turn csums off here, no extents exist. | |
288 | * Otherwise we want the flag to reflect the real COW | |
289 | * status of the file and will not set it. | |
290 | */ | |
291 | if (inode->i_size == 0) | |
292 | ip->flags |= BTRFS_INODE_NODATACOW | |
293 | | BTRFS_INODE_NODATASUM; | |
294 | } else { | |
295 | ip->flags |= BTRFS_INODE_NODATACOW; | |
296 | } | |
297 | } else { | |
298 | /* | |
01327610 | 299 | * Revert back under same assumptions as above |
7e97b8da DS |
300 | */ |
301 | if (S_ISREG(mode)) { | |
302 | if (inode->i_size == 0) | |
303 | ip->flags &= ~(BTRFS_INODE_NODATACOW | |
304 | | BTRFS_INODE_NODATASUM); | |
305 | } else { | |
306 | ip->flags &= ~BTRFS_INODE_NODATACOW; | |
307 | } | |
308 | } | |
6cbff00f | 309 | |
75e7cb7f LB |
310 | /* |
311 | * The COMPRESS flag can only be changed by users, while the NOCOMPRESS | |
312 | * flag may be changed automatically if compression code won't make | |
313 | * things smaller. | |
314 | */ | |
315 | if (flags & FS_NOCOMP_FL) { | |
316 | ip->flags &= ~BTRFS_INODE_COMPRESS; | |
317 | ip->flags |= BTRFS_INODE_NOCOMPRESS; | |
63541927 FDBM |
318 | |
319 | ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); | |
320 | if (ret && ret != -ENODATA) | |
321 | goto out_drop; | |
75e7cb7f | 322 | } else if (flags & FS_COMPR_FL) { |
63541927 FDBM |
323 | const char *comp; |
324 | ||
75e7cb7f LB |
325 | ip->flags |= BTRFS_INODE_COMPRESS; |
326 | ip->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
63541927 FDBM |
327 | |
328 | if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO) | |
329 | comp = "lzo"; | |
330 | else | |
331 | comp = "zlib"; | |
332 | ret = btrfs_set_prop(inode, "btrfs.compression", | |
333 | comp, strlen(comp), 0); | |
334 | if (ret) | |
335 | goto out_drop; | |
336 | ||
ebcb904d | 337 | } else { |
78a017a2 FM |
338 | ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); |
339 | if (ret && ret != -ENODATA) | |
340 | goto out_drop; | |
ebcb904d | 341 | ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); |
75e7cb7f | 342 | } |
6cbff00f | 343 | |
4da6f1a3 | 344 | trans = btrfs_start_transaction(root, 1); |
f062abf0 LZ |
345 | if (IS_ERR(trans)) { |
346 | ret = PTR_ERR(trans); | |
347 | goto out_drop; | |
348 | } | |
6cbff00f | 349 | |
306424cc | 350 | btrfs_update_iflags(inode); |
0c4d2d95 | 351 | inode_inc_iversion(inode); |
04b285f3 | 352 | inode->i_ctime = current_fs_time(inode->i_sb); |
6cbff00f | 353 | ret = btrfs_update_inode(trans, root, inode); |
6cbff00f | 354 | |
6cbff00f | 355 | btrfs_end_transaction(trans, root); |
f062abf0 LZ |
356 | out_drop: |
357 | if (ret) { | |
358 | ip->flags = ip_oldflags; | |
359 | inode->i_flags = i_oldflags; | |
360 | } | |
6cbff00f | 361 | |
6cbff00f | 362 | out_unlock: |
5955102c | 363 | inode_unlock(inode); |
e7848683 | 364 | mnt_drop_write_file(file); |
2d4e6f6a | 365 | return ret; |
6cbff00f CH |
366 | } |
367 | ||
368 | static int btrfs_ioctl_getversion(struct file *file, int __user *arg) | |
369 | { | |
496ad9aa | 370 | struct inode *inode = file_inode(file); |
6cbff00f CH |
371 | |
372 | return put_user(inode->i_generation, arg); | |
373 | } | |
f46b5a66 | 374 | |
f7039b1d LD |
375 | static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) |
376 | { | |
54563d41 | 377 | struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); |
f7039b1d LD |
378 | struct btrfs_device *device; |
379 | struct request_queue *q; | |
380 | struct fstrim_range range; | |
381 | u64 minlen = ULLONG_MAX; | |
382 | u64 num_devices = 0; | |
815745cf | 383 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
f7039b1d LD |
384 | int ret; |
385 | ||
386 | if (!capable(CAP_SYS_ADMIN)) | |
387 | return -EPERM; | |
388 | ||
1f78160c XG |
389 | rcu_read_lock(); |
390 | list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, | |
391 | dev_list) { | |
f7039b1d LD |
392 | if (!device->bdev) |
393 | continue; | |
394 | q = bdev_get_queue(device->bdev); | |
395 | if (blk_queue_discard(q)) { | |
396 | num_devices++; | |
397 | minlen = min((u64)q->limits.discard_granularity, | |
398 | minlen); | |
399 | } | |
400 | } | |
1f78160c | 401 | rcu_read_unlock(); |
f4c697e6 | 402 | |
f7039b1d LD |
403 | if (!num_devices) |
404 | return -EOPNOTSUPP; | |
f7039b1d LD |
405 | if (copy_from_user(&range, arg, sizeof(range))) |
406 | return -EFAULT; | |
e515c18b LC |
407 | if (range.start > total_bytes || |
408 | range.len < fs_info->sb->s_blocksize) | |
f4c697e6 | 409 | return -EINVAL; |
f7039b1d | 410 | |
f4c697e6 | 411 | range.len = min(range.len, total_bytes - range.start); |
f7039b1d | 412 | range.minlen = max(range.minlen, minlen); |
815745cf | 413 | ret = btrfs_trim_fs(fs_info->tree_root, &range); |
f7039b1d LD |
414 | if (ret < 0) |
415 | return ret; | |
416 | ||
417 | if (copy_to_user(arg, &range, sizeof(range))) | |
418 | return -EFAULT; | |
419 | ||
420 | return 0; | |
421 | } | |
422 | ||
dd5f9615 SB |
423 | int btrfs_is_empty_uuid(u8 *uuid) |
424 | { | |
46e0f66a CM |
425 | int i; |
426 | ||
427 | for (i = 0; i < BTRFS_UUID_SIZE; i++) { | |
428 | if (uuid[i]) | |
429 | return 0; | |
430 | } | |
431 | return 1; | |
dd5f9615 SB |
432 | } |
433 | ||
d5c12070 | 434 | static noinline int create_subvol(struct inode *dir, |
cb8e7090 | 435 | struct dentry *dentry, |
72fd032e | 436 | char *name, int namelen, |
6f72c7e2 | 437 | u64 *async_transid, |
8696c533 | 438 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 CH |
439 | { |
440 | struct btrfs_trans_handle *trans; | |
441 | struct btrfs_key key; | |
49a3c4d9 | 442 | struct btrfs_root_item *root_item; |
f46b5a66 CH |
443 | struct btrfs_inode_item *inode_item; |
444 | struct extent_buffer *leaf; | |
d5c12070 | 445 | struct btrfs_root *root = BTRFS_I(dir)->root; |
76dda93c | 446 | struct btrfs_root *new_root; |
d5c12070 | 447 | struct btrfs_block_rsv block_rsv; |
04b285f3 | 448 | struct timespec cur_time = current_fs_time(dir->i_sb); |
5662344b | 449 | struct inode *inode; |
f46b5a66 CH |
450 | int ret; |
451 | int err; | |
452 | u64 objectid; | |
453 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
3de4586c | 454 | u64 index = 0; |
d5c12070 | 455 | u64 qgroup_reserved; |
8ea05e3a | 456 | uuid_le new_uuid; |
f46b5a66 | 457 | |
49a3c4d9 DS |
458 | root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); |
459 | if (!root_item) | |
460 | return -ENOMEM; | |
461 | ||
581bb050 | 462 | ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); |
2fbe8c8a | 463 | if (ret) |
49a3c4d9 | 464 | goto fail_free; |
6a912213 | 465 | |
e09fe2d2 QW |
466 | /* |
467 | * Don't create subvolume whose level is not zero. Or qgroup will be | |
01327610 | 468 | * screwed up since it assumes subvolume qgroup's level to be 0. |
e09fe2d2 | 469 | */ |
49a3c4d9 DS |
470 | if (btrfs_qgroup_level(objectid)) { |
471 | ret = -ENOSPC; | |
472 | goto fail_free; | |
473 | } | |
e09fe2d2 | 474 | |
d5c12070 | 475 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
9ed74f2d | 476 | /* |
d5c12070 MX |
477 | * The same as the snapshot creation, please see the comment |
478 | * of create_snapshot(). | |
9ed74f2d | 479 | */ |
d5c12070 | 480 | ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, |
dd5f9615 | 481 | 8, &qgroup_reserved, false); |
d5c12070 | 482 | if (ret) |
49a3c4d9 | 483 | goto fail_free; |
d5c12070 MX |
484 | |
485 | trans = btrfs_start_transaction(root, 0); | |
486 | if (IS_ERR(trans)) { | |
487 | ret = PTR_ERR(trans); | |
de6e8200 LB |
488 | btrfs_subvolume_release_metadata(root, &block_rsv, |
489 | qgroup_reserved); | |
49a3c4d9 | 490 | goto fail_free; |
d5c12070 MX |
491 | } |
492 | trans->block_rsv = &block_rsv; | |
493 | trans->bytes_reserved = block_rsv.size; | |
f46b5a66 | 494 | |
8696c533 | 495 | ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); |
6f72c7e2 AJ |
496 | if (ret) |
497 | goto fail; | |
498 | ||
4d75f8a9 | 499 | leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0); |
8e8a1e31 JB |
500 | if (IS_ERR(leaf)) { |
501 | ret = PTR_ERR(leaf); | |
502 | goto fail; | |
503 | } | |
f46b5a66 | 504 | |
5d4f98a2 | 505 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
f46b5a66 CH |
506 | btrfs_set_header_bytenr(leaf, leaf->start); |
507 | btrfs_set_header_generation(leaf, trans->transid); | |
5d4f98a2 | 508 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); |
f46b5a66 CH |
509 | btrfs_set_header_owner(leaf, objectid); |
510 | ||
0a4e5586 | 511 | write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), |
f46b5a66 | 512 | BTRFS_FSID_SIZE); |
5d4f98a2 | 513 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, |
b308bc2f | 514 | btrfs_header_chunk_tree_uuid(leaf), |
5d4f98a2 | 515 | BTRFS_UUID_SIZE); |
f46b5a66 CH |
516 | btrfs_mark_buffer_dirty(leaf); |
517 | ||
49a3c4d9 | 518 | inode_item = &root_item->inode; |
3cae210f QW |
519 | btrfs_set_stack_inode_generation(inode_item, 1); |
520 | btrfs_set_stack_inode_size(inode_item, 3); | |
521 | btrfs_set_stack_inode_nlink(inode_item, 1); | |
707e8a07 | 522 | btrfs_set_stack_inode_nbytes(inode_item, root->nodesize); |
3cae210f | 523 | btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); |
f46b5a66 | 524 | |
49a3c4d9 DS |
525 | btrfs_set_root_flags(root_item, 0); |
526 | btrfs_set_root_limit(root_item, 0); | |
3cae210f | 527 | btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); |
08fe4db1 | 528 | |
49a3c4d9 DS |
529 | btrfs_set_root_bytenr(root_item, leaf->start); |
530 | btrfs_set_root_generation(root_item, trans->transid); | |
531 | btrfs_set_root_level(root_item, 0); | |
532 | btrfs_set_root_refs(root_item, 1); | |
533 | btrfs_set_root_used(root_item, leaf->len); | |
534 | btrfs_set_root_last_snapshot(root_item, 0); | |
f46b5a66 | 535 | |
49a3c4d9 DS |
536 | btrfs_set_root_generation_v2(root_item, |
537 | btrfs_root_generation(root_item)); | |
8ea05e3a | 538 | uuid_le_gen(&new_uuid); |
49a3c4d9 DS |
539 | memcpy(root_item->uuid, new_uuid.b, BTRFS_UUID_SIZE); |
540 | btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); | |
541 | btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); | |
542 | root_item->ctime = root_item->otime; | |
543 | btrfs_set_root_ctransid(root_item, trans->transid); | |
544 | btrfs_set_root_otransid(root_item, trans->transid); | |
f46b5a66 | 545 | |
925baedd | 546 | btrfs_tree_unlock(leaf); |
f46b5a66 CH |
547 | free_extent_buffer(leaf); |
548 | leaf = NULL; | |
549 | ||
49a3c4d9 | 550 | btrfs_set_root_dirid(root_item, new_dirid); |
f46b5a66 CH |
551 | |
552 | key.objectid = objectid; | |
5d4f98a2 | 553 | key.offset = 0; |
962a298f | 554 | key.type = BTRFS_ROOT_ITEM_KEY; |
f46b5a66 | 555 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
49a3c4d9 | 556 | root_item); |
f46b5a66 CH |
557 | if (ret) |
558 | goto fail; | |
559 | ||
76dda93c YZ |
560 | key.offset = (u64)-1; |
561 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); | |
79787eaa | 562 | if (IS_ERR(new_root)) { |
79787eaa | 563 | ret = PTR_ERR(new_root); |
66642832 | 564 | btrfs_abort_transaction(trans, ret); |
79787eaa JM |
565 | goto fail; |
566 | } | |
76dda93c YZ |
567 | |
568 | btrfs_record_root_in_trans(trans, new_root); | |
569 | ||
63541927 | 570 | ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); |
ce598979 MF |
571 | if (ret) { |
572 | /* We potentially lose an unused inode item here */ | |
66642832 | 573 | btrfs_abort_transaction(trans, ret); |
ce598979 MF |
574 | goto fail; |
575 | } | |
576 | ||
f32e48e9 CR |
577 | mutex_lock(&new_root->objectid_mutex); |
578 | new_root->highest_objectid = new_dirid; | |
579 | mutex_unlock(&new_root->objectid_mutex); | |
580 | ||
f46b5a66 CH |
581 | /* |
582 | * insert the directory item | |
583 | */ | |
3de4586c | 584 | ret = btrfs_set_inode_index(dir, &index); |
79787eaa | 585 | if (ret) { |
66642832 | 586 | btrfs_abort_transaction(trans, ret); |
79787eaa JM |
587 | goto fail; |
588 | } | |
3de4586c CM |
589 | |
590 | ret = btrfs_insert_dir_item(trans, root, | |
16cdcec7 | 591 | name, namelen, dir, &key, |
3de4586c | 592 | BTRFS_FT_DIR, index); |
79787eaa | 593 | if (ret) { |
66642832 | 594 | btrfs_abort_transaction(trans, ret); |
f46b5a66 | 595 | goto fail; |
79787eaa | 596 | } |
0660b5af | 597 | |
52c26179 YZ |
598 | btrfs_i_size_write(dir, dir->i_size + namelen * 2); |
599 | ret = btrfs_update_inode(trans, root, dir); | |
600 | BUG_ON(ret); | |
601 | ||
0660b5af | 602 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
4df27c4d | 603 | objectid, root->root_key.objectid, |
33345d01 | 604 | btrfs_ino(dir), index, name, namelen); |
76dda93c | 605 | BUG_ON(ret); |
f46b5a66 | 606 | |
dd5f9615 | 607 | ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, |
49a3c4d9 | 608 | root_item->uuid, BTRFS_UUID_KEY_SUBVOL, |
dd5f9615 SB |
609 | objectid); |
610 | if (ret) | |
66642832 | 611 | btrfs_abort_transaction(trans, ret); |
dd5f9615 | 612 | |
f46b5a66 | 613 | fail: |
49a3c4d9 | 614 | kfree(root_item); |
d5c12070 MX |
615 | trans->block_rsv = NULL; |
616 | trans->bytes_reserved = 0; | |
de6e8200 LB |
617 | btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); |
618 | ||
72fd032e SW |
619 | if (async_transid) { |
620 | *async_transid = trans->transid; | |
621 | err = btrfs_commit_transaction_async(trans, root, 1); | |
00d71c9c MX |
622 | if (err) |
623 | err = btrfs_commit_transaction(trans, root); | |
72fd032e SW |
624 | } else { |
625 | err = btrfs_commit_transaction(trans, root); | |
626 | } | |
f46b5a66 CH |
627 | if (err && !ret) |
628 | ret = err; | |
1a65e24b | 629 | |
5662344b TI |
630 | if (!ret) { |
631 | inode = btrfs_lookup_dentry(dir, dentry); | |
de6e8200 LB |
632 | if (IS_ERR(inode)) |
633 | return PTR_ERR(inode); | |
5662344b TI |
634 | d_instantiate(dentry, inode); |
635 | } | |
f46b5a66 | 636 | return ret; |
49a3c4d9 DS |
637 | |
638 | fail_free: | |
639 | kfree(root_item); | |
640 | return ret; | |
f46b5a66 CH |
641 | } |
642 | ||
9ea24bbe | 643 | static void btrfs_wait_for_no_snapshoting_writes(struct btrfs_root *root) |
8257b2dc MX |
644 | { |
645 | s64 writers; | |
646 | DEFINE_WAIT(wait); | |
647 | ||
648 | do { | |
649 | prepare_to_wait(&root->subv_writers->wait, &wait, | |
650 | TASK_UNINTERRUPTIBLE); | |
651 | ||
652 | writers = percpu_counter_sum(&root->subv_writers->counter); | |
653 | if (writers) | |
654 | schedule(); | |
655 | ||
656 | finish_wait(&root->subv_writers->wait, &wait); | |
657 | } while (writers); | |
658 | } | |
659 | ||
e9662f70 MX |
660 | static int create_snapshot(struct btrfs_root *root, struct inode *dir, |
661 | struct dentry *dentry, char *name, int namelen, | |
662 | u64 *async_transid, bool readonly, | |
663 | struct btrfs_qgroup_inherit *inherit) | |
f46b5a66 | 664 | { |
2e4bfab9 | 665 | struct inode *inode; |
f46b5a66 CH |
666 | struct btrfs_pending_snapshot *pending_snapshot; |
667 | struct btrfs_trans_handle *trans; | |
2e4bfab9 | 668 | int ret; |
f46b5a66 | 669 | |
27cdeb70 | 670 | if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) |
f46b5a66 CH |
671 | return -EINVAL; |
672 | ||
a1ee7362 DS |
673 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
674 | if (!pending_snapshot) | |
675 | return -ENOMEM; | |
676 | ||
b0c0ea63 DS |
677 | pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), |
678 | GFP_NOFS); | |
8546b570 DS |
679 | pending_snapshot->path = btrfs_alloc_path(); |
680 | if (!pending_snapshot->root_item || !pending_snapshot->path) { | |
b0c0ea63 DS |
681 | ret = -ENOMEM; |
682 | goto free_pending; | |
683 | } | |
684 | ||
8257b2dc | 685 | atomic_inc(&root->will_be_snapshoted); |
4e857c58 | 686 | smp_mb__after_atomic(); |
9ea24bbe | 687 | btrfs_wait_for_no_snapshoting_writes(root); |
8257b2dc | 688 | |
6a03843d MX |
689 | ret = btrfs_start_delalloc_inodes(root, 0); |
690 | if (ret) | |
a1ee7362 | 691 | goto dec_and_free; |
6a03843d | 692 | |
578def7c | 693 | btrfs_wait_ordered_extents(root, -1, 0, (u64)-1); |
6a03843d | 694 | |
66d8f3dd MX |
695 | btrfs_init_block_rsv(&pending_snapshot->block_rsv, |
696 | BTRFS_BLOCK_RSV_TEMP); | |
d5c12070 MX |
697 | /* |
698 | * 1 - parent dir inode | |
699 | * 2 - dir entries | |
700 | * 1 - root item | |
701 | * 2 - root ref/backref | |
702 | * 1 - root of snapshot | |
dd5f9615 | 703 | * 1 - UUID item |
d5c12070 MX |
704 | */ |
705 | ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, | |
dd5f9615 | 706 | &pending_snapshot->block_rsv, 8, |
ee3441b4 JM |
707 | &pending_snapshot->qgroup_reserved, |
708 | false); | |
d5c12070 | 709 | if (ret) |
a1ee7362 | 710 | goto dec_and_free; |
d5c12070 | 711 | |
3de4586c | 712 | pending_snapshot->dentry = dentry; |
f46b5a66 | 713 | pending_snapshot->root = root; |
b83cc969 | 714 | pending_snapshot->readonly = readonly; |
e9662f70 | 715 | pending_snapshot->dir = dir; |
8696c533 | 716 | pending_snapshot->inherit = inherit; |
a22285a6 | 717 | |
d5c12070 | 718 | trans = btrfs_start_transaction(root, 0); |
a22285a6 YZ |
719 | if (IS_ERR(trans)) { |
720 | ret = PTR_ERR(trans); | |
721 | goto fail; | |
722 | } | |
723 | ||
8351583e | 724 | spin_lock(&root->fs_info->trans_lock); |
f46b5a66 CH |
725 | list_add(&pending_snapshot->list, |
726 | &trans->transaction->pending_snapshots); | |
8351583e | 727 | spin_unlock(&root->fs_info->trans_lock); |
72fd032e SW |
728 | if (async_transid) { |
729 | *async_transid = trans->transid; | |
730 | ret = btrfs_commit_transaction_async(trans, | |
731 | root->fs_info->extent_root, 1); | |
00d71c9c MX |
732 | if (ret) |
733 | ret = btrfs_commit_transaction(trans, root); | |
72fd032e SW |
734 | } else { |
735 | ret = btrfs_commit_transaction(trans, | |
736 | root->fs_info->extent_root); | |
737 | } | |
aec8030a | 738 | if (ret) |
c37b2b62 | 739 | goto fail; |
a22285a6 YZ |
740 | |
741 | ret = pending_snapshot->error; | |
742 | if (ret) | |
743 | goto fail; | |
744 | ||
d3797308 CM |
745 | ret = btrfs_orphan_cleanup(pending_snapshot->snap); |
746 | if (ret) | |
747 | goto fail; | |
748 | ||
2b0143b5 | 749 | inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); |
2e4bfab9 YZ |
750 | if (IS_ERR(inode)) { |
751 | ret = PTR_ERR(inode); | |
752 | goto fail; | |
753 | } | |
5662344b | 754 | |
2e4bfab9 YZ |
755 | d_instantiate(dentry, inode); |
756 | ret = 0; | |
757 | fail: | |
d5c12070 MX |
758 | btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, |
759 | &pending_snapshot->block_rsv, | |
760 | pending_snapshot->qgroup_reserved); | |
a1ee7362 | 761 | dec_and_free: |
9ea24bbe FM |
762 | if (atomic_dec_and_test(&root->will_be_snapshoted)) |
763 | wake_up_atomic_t(&root->will_be_snapshoted); | |
b0c0ea63 DS |
764 | free_pending: |
765 | kfree(pending_snapshot->root_item); | |
8546b570 | 766 | btrfs_free_path(pending_snapshot->path); |
a1ee7362 DS |
767 | kfree(pending_snapshot); |
768 | ||
f46b5a66 CH |
769 | return ret; |
770 | } | |
771 | ||
4260f7c7 SW |
772 | /* copy of may_delete in fs/namei.c() |
773 | * Check whether we can remove a link victim from directory dir, check | |
774 | * whether the type of victim is right. | |
775 | * 1. We can't do it if dir is read-only (done in permission()) | |
776 | * 2. We should have write and exec permissions on dir | |
777 | * 3. We can't remove anything from append-only dir | |
778 | * 4. We can't do anything with immutable dir (done in permission()) | |
779 | * 5. If the sticky bit on dir is set we should either | |
780 | * a. be owner of dir, or | |
781 | * b. be owner of victim, or | |
782 | * c. have CAP_FOWNER capability | |
01327610 | 783 | * 6. If the victim is append-only or immutable we can't do anything with |
4260f7c7 SW |
784 | * links pointing to it. |
785 | * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. | |
786 | * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. | |
787 | * 9. We can't remove a root or mountpoint. | |
788 | * 10. We don't allow removal of NFS sillyrenamed files; it's handled by | |
789 | * nfs_async_unlink(). | |
790 | */ | |
791 | ||
67871254 | 792 | static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) |
4260f7c7 SW |
793 | { |
794 | int error; | |
795 | ||
2b0143b5 | 796 | if (d_really_is_negative(victim)) |
4260f7c7 SW |
797 | return -ENOENT; |
798 | ||
2b0143b5 | 799 | BUG_ON(d_inode(victim->d_parent) != dir); |
4fa6b5ec | 800 | audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); |
4260f7c7 SW |
801 | |
802 | error = inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
803 | if (error) | |
804 | return error; | |
805 | if (IS_APPEND(dir)) | |
806 | return -EPERM; | |
2b0143b5 DH |
807 | if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) || |
808 | IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim))) | |
4260f7c7 SW |
809 | return -EPERM; |
810 | if (isdir) { | |
e36cb0b8 | 811 | if (!d_is_dir(victim)) |
4260f7c7 SW |
812 | return -ENOTDIR; |
813 | if (IS_ROOT(victim)) | |
814 | return -EBUSY; | |
e36cb0b8 | 815 | } else if (d_is_dir(victim)) |
4260f7c7 SW |
816 | return -EISDIR; |
817 | if (IS_DEADDIR(dir)) | |
818 | return -ENOENT; | |
819 | if (victim->d_flags & DCACHE_NFSFS_RENAMED) | |
820 | return -EBUSY; | |
821 | return 0; | |
822 | } | |
823 | ||
cb8e7090 CH |
824 | /* copy of may_create in fs/namei.c() */ |
825 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
826 | { | |
2b0143b5 | 827 | if (d_really_is_positive(child)) |
cb8e7090 CH |
828 | return -EEXIST; |
829 | if (IS_DEADDIR(dir)) | |
830 | return -ENOENT; | |
831 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
832 | } | |
833 | ||
834 | /* | |
835 | * Create a new subvolume below @parent. This is largely modeled after | |
836 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
837 | * inside this filesystem so it's quite a bit simpler. | |
838 | */ | |
76dda93c YZ |
839 | static noinline int btrfs_mksubvol(struct path *parent, |
840 | char *name, int namelen, | |
72fd032e | 841 | struct btrfs_root *snap_src, |
6f72c7e2 | 842 | u64 *async_transid, bool readonly, |
8696c533 | 843 | struct btrfs_qgroup_inherit *inherit) |
cb8e7090 | 844 | { |
2b0143b5 | 845 | struct inode *dir = d_inode(parent->dentry); |
cb8e7090 CH |
846 | struct dentry *dentry; |
847 | int error; | |
848 | ||
00235411 AV |
849 | error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); |
850 | if (error == -EINTR) | |
851 | return error; | |
cb8e7090 CH |
852 | |
853 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
854 | error = PTR_ERR(dentry); | |
855 | if (IS_ERR(dentry)) | |
856 | goto out_unlock; | |
857 | ||
76dda93c | 858 | error = btrfs_may_create(dir, dentry); |
cb8e7090 | 859 | if (error) |
a874a63e | 860 | goto out_dput; |
cb8e7090 | 861 | |
9c52057c CM |
862 | /* |
863 | * even if this name doesn't exist, we may get hash collisions. | |
864 | * check for them now when we can safely fail | |
865 | */ | |
866 | error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, | |
867 | dir->i_ino, name, | |
868 | namelen); | |
869 | if (error) | |
870 | goto out_dput; | |
871 | ||
76dda93c YZ |
872 | down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); |
873 | ||
874 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) | |
875 | goto out_up_read; | |
876 | ||
3de4586c | 877 | if (snap_src) { |
e9662f70 | 878 | error = create_snapshot(snap_src, dir, dentry, name, namelen, |
6f72c7e2 | 879 | async_transid, readonly, inherit); |
3de4586c | 880 | } else { |
d5c12070 MX |
881 | error = create_subvol(dir, dentry, name, namelen, |
882 | async_transid, inherit); | |
3de4586c | 883 | } |
76dda93c YZ |
884 | if (!error) |
885 | fsnotify_mkdir(dir, dentry); | |
886 | out_up_read: | |
887 | up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); | |
cb8e7090 CH |
888 | out_dput: |
889 | dput(dentry); | |
890 | out_unlock: | |
5955102c | 891 | inode_unlock(dir); |
cb8e7090 CH |
892 | return error; |
893 | } | |
894 | ||
4cb5300b CM |
895 | /* |
896 | * When we're defragging a range, we don't want to kick it off again | |
897 | * if it is really just waiting for delalloc to send it down. | |
898 | * If we find a nice big extent or delalloc range for the bytes in the | |
899 | * file you want to defrag, we return 0 to let you know to skip this | |
900 | * part of the file | |
901 | */ | |
aab110ab | 902 | static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) |
4cb5300b CM |
903 | { |
904 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
905 | struct extent_map *em = NULL; | |
906 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
907 | u64 end; | |
908 | ||
909 | read_lock(&em_tree->lock); | |
09cbfeaf | 910 | em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE); |
4cb5300b CM |
911 | read_unlock(&em_tree->lock); |
912 | ||
913 | if (em) { | |
914 | end = extent_map_end(em); | |
915 | free_extent_map(em); | |
916 | if (end - offset > thresh) | |
917 | return 0; | |
918 | } | |
919 | /* if we already have a nice delalloc here, just stop */ | |
920 | thresh /= 2; | |
921 | end = count_range_bits(io_tree, &offset, offset + thresh, | |
922 | thresh, EXTENT_DELALLOC, 1); | |
923 | if (end >= thresh) | |
924 | return 0; | |
925 | return 1; | |
926 | } | |
927 | ||
928 | /* | |
929 | * helper function to walk through a file and find extents | |
930 | * newer than a specific transid, and smaller than thresh. | |
931 | * | |
932 | * This is used by the defragging code to find new and small | |
933 | * extents | |
934 | */ | |
935 | static int find_new_extents(struct btrfs_root *root, | |
936 | struct inode *inode, u64 newer_than, | |
aab110ab | 937 | u64 *off, u32 thresh) |
4cb5300b CM |
938 | { |
939 | struct btrfs_path *path; | |
940 | struct btrfs_key min_key; | |
4cb5300b CM |
941 | struct extent_buffer *leaf; |
942 | struct btrfs_file_extent_item *extent; | |
943 | int type; | |
944 | int ret; | |
a4689d2b | 945 | u64 ino = btrfs_ino(inode); |
4cb5300b CM |
946 | |
947 | path = btrfs_alloc_path(); | |
948 | if (!path) | |
949 | return -ENOMEM; | |
950 | ||
a4689d2b | 951 | min_key.objectid = ino; |
4cb5300b CM |
952 | min_key.type = BTRFS_EXTENT_DATA_KEY; |
953 | min_key.offset = *off; | |
954 | ||
67871254 | 955 | while (1) { |
6174d3cb | 956 | ret = btrfs_search_forward(root, &min_key, path, newer_than); |
4cb5300b CM |
957 | if (ret != 0) |
958 | goto none; | |
f094c9bd | 959 | process_slot: |
a4689d2b | 960 | if (min_key.objectid != ino) |
4cb5300b CM |
961 | goto none; |
962 | if (min_key.type != BTRFS_EXTENT_DATA_KEY) | |
963 | goto none; | |
964 | ||
965 | leaf = path->nodes[0]; | |
966 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
967 | struct btrfs_file_extent_item); | |
968 | ||
969 | type = btrfs_file_extent_type(leaf, extent); | |
970 | if (type == BTRFS_FILE_EXTENT_REG && | |
971 | btrfs_file_extent_num_bytes(leaf, extent) < thresh && | |
972 | check_defrag_in_cache(inode, min_key.offset, thresh)) { | |
973 | *off = min_key.offset; | |
974 | btrfs_free_path(path); | |
975 | return 0; | |
976 | } | |
977 | ||
f094c9bd FM |
978 | path->slots[0]++; |
979 | if (path->slots[0] < btrfs_header_nritems(leaf)) { | |
980 | btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); | |
981 | goto process_slot; | |
982 | } | |
983 | ||
4cb5300b CM |
984 | if (min_key.offset == (u64)-1) |
985 | goto none; | |
986 | ||
987 | min_key.offset++; | |
988 | btrfs_release_path(path); | |
989 | } | |
990 | none: | |
991 | btrfs_free_path(path); | |
992 | return -ENOENT; | |
993 | } | |
994 | ||
6c282eb4 | 995 | static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) |
17ce6ef8 LB |
996 | { |
997 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
6c282eb4 LZ |
998 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
999 | struct extent_map *em; | |
09cbfeaf | 1000 | u64 len = PAGE_SIZE; |
17ce6ef8 | 1001 | |
6c282eb4 LZ |
1002 | /* |
1003 | * hopefully we have this extent in the tree already, try without | |
1004 | * the full extent lock | |
1005 | */ | |
17ce6ef8 | 1006 | read_lock(&em_tree->lock); |
6c282eb4 | 1007 | em = lookup_extent_mapping(em_tree, start, len); |
17ce6ef8 LB |
1008 | read_unlock(&em_tree->lock); |
1009 | ||
6c282eb4 | 1010 | if (!em) { |
308d9800 FM |
1011 | struct extent_state *cached = NULL; |
1012 | u64 end = start + len - 1; | |
1013 | ||
6c282eb4 | 1014 | /* get the big lock and read metadata off disk */ |
ff13db41 | 1015 | lock_extent_bits(io_tree, start, end, &cached); |
6c282eb4 | 1016 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); |
308d9800 | 1017 | unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS); |
6c282eb4 LZ |
1018 | |
1019 | if (IS_ERR(em)) | |
1020 | return NULL; | |
1021 | } | |
1022 | ||
1023 | return em; | |
1024 | } | |
17ce6ef8 | 1025 | |
6c282eb4 LZ |
1026 | static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) |
1027 | { | |
1028 | struct extent_map *next; | |
1029 | bool ret = true; | |
1030 | ||
1031 | /* this is the last extent */ | |
1032 | if (em->start + em->len >= i_size_read(inode)) | |
1033 | return false; | |
1034 | ||
1035 | next = defrag_lookup_extent(inode, em->start + em->len); | |
e9512d72 CM |
1036 | if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) |
1037 | ret = false; | |
1038 | else if ((em->block_start + em->block_len == next->block_start) && | |
ee22184b | 1039 | (em->block_len > SZ_128K && next->block_len > SZ_128K)) |
6c282eb4 LZ |
1040 | ret = false; |
1041 | ||
1042 | free_extent_map(next); | |
17ce6ef8 LB |
1043 | return ret; |
1044 | } | |
1045 | ||
aab110ab | 1046 | static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, |
a43a2111 AM |
1047 | u64 *last_len, u64 *skip, u64 *defrag_end, |
1048 | int compress) | |
940100a4 | 1049 | { |
6c282eb4 | 1050 | struct extent_map *em; |
940100a4 | 1051 | int ret = 1; |
6c282eb4 | 1052 | bool next_mergeable = true; |
4a3560c4 | 1053 | bool prev_mergeable = true; |
940100a4 CM |
1054 | |
1055 | /* | |
008873ea | 1056 | * make sure that once we start defragging an extent, we keep on |
940100a4 CM |
1057 | * defragging it |
1058 | */ | |
1059 | if (start < *defrag_end) | |
1060 | return 1; | |
1061 | ||
1062 | *skip = 0; | |
1063 | ||
6c282eb4 LZ |
1064 | em = defrag_lookup_extent(inode, start); |
1065 | if (!em) | |
1066 | return 0; | |
940100a4 CM |
1067 | |
1068 | /* this will cover holes, and inline extents */ | |
17ce6ef8 | 1069 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { |
940100a4 | 1070 | ret = 0; |
17ce6ef8 LB |
1071 | goto out; |
1072 | } | |
1073 | ||
4a3560c4 LB |
1074 | if (!*defrag_end) |
1075 | prev_mergeable = false; | |
1076 | ||
6c282eb4 | 1077 | next_mergeable = defrag_check_next_extent(inode, em); |
940100a4 | 1078 | /* |
6c282eb4 LZ |
1079 | * we hit a real extent, if it is big or the next extent is not a |
1080 | * real extent, don't bother defragging it | |
940100a4 | 1081 | */ |
a43a2111 | 1082 | if (!compress && (*last_len == 0 || *last_len >= thresh) && |
4a3560c4 | 1083 | (em->len >= thresh || (!next_mergeable && !prev_mergeable))) |
940100a4 | 1084 | ret = 0; |
17ce6ef8 | 1085 | out: |
940100a4 CM |
1086 | /* |
1087 | * last_len ends up being a counter of how many bytes we've defragged. | |
1088 | * every time we choose not to defrag an extent, we reset *last_len | |
1089 | * so that the next tiny extent will force a defrag. | |
1090 | * | |
1091 | * The end result of this is that tiny extents before a single big | |
1092 | * extent will force at least part of that big extent to be defragged. | |
1093 | */ | |
1094 | if (ret) { | |
940100a4 CM |
1095 | *defrag_end = extent_map_end(em); |
1096 | } else { | |
1097 | *last_len = 0; | |
1098 | *skip = extent_map_end(em); | |
1099 | *defrag_end = 0; | |
1100 | } | |
1101 | ||
1102 | free_extent_map(em); | |
1103 | return ret; | |
1104 | } | |
1105 | ||
4cb5300b CM |
1106 | /* |
1107 | * it doesn't do much good to defrag one or two pages | |
1108 | * at a time. This pulls in a nice chunk of pages | |
1109 | * to COW and defrag. | |
1110 | * | |
1111 | * It also makes sure the delalloc code has enough | |
1112 | * dirty data to avoid making new small extents as part | |
1113 | * of the defrag | |
1114 | * | |
1115 | * It's a good idea to start RA on this range | |
1116 | * before calling this. | |
1117 | */ | |
1118 | static int cluster_pages_for_defrag(struct inode *inode, | |
1119 | struct page **pages, | |
1120 | unsigned long start_index, | |
c41570c9 | 1121 | unsigned long num_pages) |
f46b5a66 | 1122 | { |
4cb5300b CM |
1123 | unsigned long file_end; |
1124 | u64 isize = i_size_read(inode); | |
1125 | u64 page_start; | |
1126 | u64 page_end; | |
1f12bd06 | 1127 | u64 page_cnt; |
4cb5300b CM |
1128 | int ret; |
1129 | int i; | |
1130 | int i_done; | |
3eaa2885 | 1131 | struct btrfs_ordered_extent *ordered; |
4cb5300b | 1132 | struct extent_state *cached_state = NULL; |
600a45e1 | 1133 | struct extent_io_tree *tree; |
3b16a4e3 | 1134 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
4cb5300b | 1135 | |
09cbfeaf | 1136 | file_end = (isize - 1) >> PAGE_SHIFT; |
1f12bd06 LB |
1137 | if (!isize || start_index > file_end) |
1138 | return 0; | |
1139 | ||
1140 | page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); | |
4cb5300b CM |
1141 | |
1142 | ret = btrfs_delalloc_reserve_space(inode, | |
09cbfeaf KS |
1143 | start_index << PAGE_SHIFT, |
1144 | page_cnt << PAGE_SHIFT); | |
4cb5300b CM |
1145 | if (ret) |
1146 | return ret; | |
4cb5300b | 1147 | i_done = 0; |
600a45e1 | 1148 | tree = &BTRFS_I(inode)->io_tree; |
4cb5300b CM |
1149 | |
1150 | /* step one, lock all the pages */ | |
1f12bd06 | 1151 | for (i = 0; i < page_cnt; i++) { |
4cb5300b | 1152 | struct page *page; |
600a45e1 | 1153 | again: |
a94733d0 | 1154 | page = find_or_create_page(inode->i_mapping, |
600a45e1 | 1155 | start_index + i, mask); |
4cb5300b CM |
1156 | if (!page) |
1157 | break; | |
1158 | ||
600a45e1 | 1159 | page_start = page_offset(page); |
09cbfeaf | 1160 | page_end = page_start + PAGE_SIZE - 1; |
600a45e1 | 1161 | while (1) { |
308d9800 | 1162 | lock_extent_bits(tree, page_start, page_end, |
ff13db41 | 1163 | &cached_state); |
600a45e1 MX |
1164 | ordered = btrfs_lookup_ordered_extent(inode, |
1165 | page_start); | |
308d9800 FM |
1166 | unlock_extent_cached(tree, page_start, page_end, |
1167 | &cached_state, GFP_NOFS); | |
600a45e1 MX |
1168 | if (!ordered) |
1169 | break; | |
1170 | ||
1171 | unlock_page(page); | |
1172 | btrfs_start_ordered_extent(inode, ordered, 1); | |
1173 | btrfs_put_ordered_extent(ordered); | |
1174 | lock_page(page); | |
1f12bd06 LB |
1175 | /* |
1176 | * we unlocked the page above, so we need check if | |
1177 | * it was released or not. | |
1178 | */ | |
1179 | if (page->mapping != inode->i_mapping) { | |
1180 | unlock_page(page); | |
09cbfeaf | 1181 | put_page(page); |
1f12bd06 LB |
1182 | goto again; |
1183 | } | |
600a45e1 MX |
1184 | } |
1185 | ||
4cb5300b CM |
1186 | if (!PageUptodate(page)) { |
1187 | btrfs_readpage(NULL, page); | |
1188 | lock_page(page); | |
1189 | if (!PageUptodate(page)) { | |
1190 | unlock_page(page); | |
09cbfeaf | 1191 | put_page(page); |
4cb5300b CM |
1192 | ret = -EIO; |
1193 | break; | |
1194 | } | |
1195 | } | |
600a45e1 | 1196 | |
600a45e1 MX |
1197 | if (page->mapping != inode->i_mapping) { |
1198 | unlock_page(page); | |
09cbfeaf | 1199 | put_page(page); |
600a45e1 MX |
1200 | goto again; |
1201 | } | |
1202 | ||
4cb5300b CM |
1203 | pages[i] = page; |
1204 | i_done++; | |
1205 | } | |
1206 | if (!i_done || ret) | |
1207 | goto out; | |
1208 | ||
1209 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
1210 | goto out; | |
1211 | ||
1212 | /* | |
1213 | * so now we have a nice long stream of locked | |
1214 | * and up to date pages, lets wait on them | |
1215 | */ | |
1216 | for (i = 0; i < i_done; i++) | |
1217 | wait_on_page_writeback(pages[i]); | |
1218 | ||
1219 | page_start = page_offset(pages[0]); | |
09cbfeaf | 1220 | page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; |
4cb5300b CM |
1221 | |
1222 | lock_extent_bits(&BTRFS_I(inode)->io_tree, | |
ff13db41 | 1223 | page_start, page_end - 1, &cached_state); |
4cb5300b CM |
1224 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, |
1225 | page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | | |
9e8a4a8b LB |
1226 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, |
1227 | &cached_state, GFP_NOFS); | |
4cb5300b | 1228 | |
1f12bd06 | 1229 | if (i_done != page_cnt) { |
9e0baf60 JB |
1230 | spin_lock(&BTRFS_I(inode)->lock); |
1231 | BTRFS_I(inode)->outstanding_extents++; | |
1232 | spin_unlock(&BTRFS_I(inode)->lock); | |
4cb5300b | 1233 | btrfs_delalloc_release_space(inode, |
09cbfeaf KS |
1234 | start_index << PAGE_SHIFT, |
1235 | (page_cnt - i_done) << PAGE_SHIFT); | |
4cb5300b CM |
1236 | } |
1237 | ||
1238 | ||
9e8a4a8b | 1239 | set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, |
018ed4f7 | 1240 | &cached_state); |
4cb5300b CM |
1241 | |
1242 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, | |
1243 | page_start, page_end - 1, &cached_state, | |
1244 | GFP_NOFS); | |
1245 | ||
1246 | for (i = 0; i < i_done; i++) { | |
1247 | clear_page_dirty_for_io(pages[i]); | |
1248 | ClearPageChecked(pages[i]); | |
1249 | set_page_extent_mapped(pages[i]); | |
1250 | set_page_dirty(pages[i]); | |
1251 | unlock_page(pages[i]); | |
09cbfeaf | 1252 | put_page(pages[i]); |
4cb5300b CM |
1253 | } |
1254 | return i_done; | |
1255 | out: | |
1256 | for (i = 0; i < i_done; i++) { | |
1257 | unlock_page(pages[i]); | |
09cbfeaf | 1258 | put_page(pages[i]); |
4cb5300b | 1259 | } |
7cf5b976 | 1260 | btrfs_delalloc_release_space(inode, |
09cbfeaf KS |
1261 | start_index << PAGE_SHIFT, |
1262 | page_cnt << PAGE_SHIFT); | |
4cb5300b CM |
1263 | return ret; |
1264 | ||
1265 | } | |
1266 | ||
1267 | int btrfs_defrag_file(struct inode *inode, struct file *file, | |
1268 | struct btrfs_ioctl_defrag_range_args *range, | |
1269 | u64 newer_than, unsigned long max_to_defrag) | |
1270 | { | |
1271 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4cb5300b | 1272 | struct file_ra_state *ra = NULL; |
f46b5a66 | 1273 | unsigned long last_index; |
151a31b2 | 1274 | u64 isize = i_size_read(inode); |
940100a4 CM |
1275 | u64 last_len = 0; |
1276 | u64 skip = 0; | |
1277 | u64 defrag_end = 0; | |
4cb5300b | 1278 | u64 newer_off = range->start; |
f46b5a66 | 1279 | unsigned long i; |
008873ea | 1280 | unsigned long ra_index = 0; |
f46b5a66 | 1281 | int ret; |
4cb5300b | 1282 | int defrag_count = 0; |
1a419d85 | 1283 | int compress_type = BTRFS_COMPRESS_ZLIB; |
aab110ab | 1284 | u32 extent_thresh = range->extent_thresh; |
09cbfeaf | 1285 | unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; |
c41570c9 | 1286 | unsigned long cluster = max_cluster; |
ee22184b | 1287 | u64 new_align = ~((u64)SZ_128K - 1); |
4cb5300b CM |
1288 | struct page **pages = NULL; |
1289 | ||
0abd5b17 LB |
1290 | if (isize == 0) |
1291 | return 0; | |
1292 | ||
1293 | if (range->start >= isize) | |
1294 | return -EINVAL; | |
1a419d85 LZ |
1295 | |
1296 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { | |
1297 | if (range->compress_type > BTRFS_COMPRESS_TYPES) | |
1298 | return -EINVAL; | |
1299 | if (range->compress_type) | |
1300 | compress_type = range->compress_type; | |
1301 | } | |
f46b5a66 | 1302 | |
0abd5b17 | 1303 | if (extent_thresh == 0) |
ee22184b | 1304 | extent_thresh = SZ_256K; |
940100a4 | 1305 | |
4cb5300b CM |
1306 | /* |
1307 | * if we were not given a file, allocate a readahead | |
1308 | * context | |
1309 | */ | |
1310 | if (!file) { | |
1311 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
1312 | if (!ra) | |
1313 | return -ENOMEM; | |
1314 | file_ra_state_init(ra, inode->i_mapping); | |
1315 | } else { | |
1316 | ra = &file->f_ra; | |
1317 | } | |
1318 | ||
d9b0d9ba | 1319 | pages = kmalloc_array(max_cluster, sizeof(struct page *), |
4cb5300b CM |
1320 | GFP_NOFS); |
1321 | if (!pages) { | |
1322 | ret = -ENOMEM; | |
1323 | goto out_ra; | |
1324 | } | |
1325 | ||
1326 | /* find the last page to defrag */ | |
1e701a32 | 1327 | if (range->start + range->len > range->start) { |
151a31b2 | 1328 | last_index = min_t(u64, isize - 1, |
09cbfeaf | 1329 | range->start + range->len - 1) >> PAGE_SHIFT; |
1e701a32 | 1330 | } else { |
09cbfeaf | 1331 | last_index = (isize - 1) >> PAGE_SHIFT; |
1e701a32 CM |
1332 | } |
1333 | ||
4cb5300b CM |
1334 | if (newer_than) { |
1335 | ret = find_new_extents(root, inode, newer_than, | |
ee22184b | 1336 | &newer_off, SZ_64K); |
4cb5300b CM |
1337 | if (!ret) { |
1338 | range->start = newer_off; | |
1339 | /* | |
1340 | * we always align our defrag to help keep | |
1341 | * the extents in the file evenly spaced | |
1342 | */ | |
09cbfeaf | 1343 | i = (newer_off & new_align) >> PAGE_SHIFT; |
4cb5300b CM |
1344 | } else |
1345 | goto out_ra; | |
1346 | } else { | |
09cbfeaf | 1347 | i = range->start >> PAGE_SHIFT; |
4cb5300b CM |
1348 | } |
1349 | if (!max_to_defrag) | |
070034bd | 1350 | max_to_defrag = last_index - i + 1; |
4cb5300b | 1351 | |
2a0f7f57 LZ |
1352 | /* |
1353 | * make writeback starts from i, so the defrag range can be | |
1354 | * written sequentially. | |
1355 | */ | |
1356 | if (i < inode->i_mapping->writeback_index) | |
1357 | inode->i_mapping->writeback_index = i; | |
1358 | ||
f7f43cc8 | 1359 | while (i <= last_index && defrag_count < max_to_defrag && |
09cbfeaf | 1360 | (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { |
4cb5300b CM |
1361 | /* |
1362 | * make sure we stop running if someone unmounts | |
1363 | * the FS | |
1364 | */ | |
1365 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
1366 | break; | |
1367 | ||
210549eb | 1368 | if (btrfs_defrag_cancelled(root->fs_info)) { |
f14d104d | 1369 | btrfs_debug(root->fs_info, "defrag_file cancelled"); |
210549eb DS |
1370 | ret = -EAGAIN; |
1371 | break; | |
1372 | } | |
1373 | ||
09cbfeaf | 1374 | if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, |
6c282eb4 | 1375 | extent_thresh, &last_len, &skip, |
a43a2111 AM |
1376 | &defrag_end, range->flags & |
1377 | BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
940100a4 CM |
1378 | unsigned long next; |
1379 | /* | |
1380 | * the should_defrag function tells us how much to skip | |
1381 | * bump our counter by the suggested amount | |
1382 | */ | |
09cbfeaf | 1383 | next = DIV_ROUND_UP(skip, PAGE_SIZE); |
940100a4 CM |
1384 | i = max(i + 1, next); |
1385 | continue; | |
1386 | } | |
008873ea LZ |
1387 | |
1388 | if (!newer_than) { | |
09cbfeaf KS |
1389 | cluster = (PAGE_ALIGN(defrag_end) >> |
1390 | PAGE_SHIFT) - i; | |
008873ea LZ |
1391 | cluster = min(cluster, max_cluster); |
1392 | } else { | |
1393 | cluster = max_cluster; | |
1394 | } | |
1395 | ||
008873ea LZ |
1396 | if (i + cluster > ra_index) { |
1397 | ra_index = max(i, ra_index); | |
1398 | btrfs_force_ra(inode->i_mapping, ra, file, ra_index, | |
1399 | cluster); | |
e4826a5b | 1400 | ra_index += cluster; |
008873ea | 1401 | } |
940100a4 | 1402 | |
5955102c | 1403 | inode_lock(inode); |
633085c7 FDBM |
1404 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) |
1405 | BTRFS_I(inode)->force_compress = compress_type; | |
008873ea | 1406 | ret = cluster_pages_for_defrag(inode, pages, i, cluster); |
ecb8bea8 | 1407 | if (ret < 0) { |
5955102c | 1408 | inode_unlock(inode); |
4cb5300b | 1409 | goto out_ra; |
ecb8bea8 | 1410 | } |
4cb5300b CM |
1411 | |
1412 | defrag_count += ret; | |
d0e1d66b | 1413 | balance_dirty_pages_ratelimited(inode->i_mapping); |
5955102c | 1414 | inode_unlock(inode); |
4cb5300b CM |
1415 | |
1416 | if (newer_than) { | |
1417 | if (newer_off == (u64)-1) | |
1418 | break; | |
1419 | ||
e1f041e1 LB |
1420 | if (ret > 0) |
1421 | i += ret; | |
1422 | ||
4cb5300b | 1423 | newer_off = max(newer_off + 1, |
09cbfeaf | 1424 | (u64)i << PAGE_SHIFT); |
4cb5300b | 1425 | |
ee22184b BL |
1426 | ret = find_new_extents(root, inode, newer_than, |
1427 | &newer_off, SZ_64K); | |
4cb5300b CM |
1428 | if (!ret) { |
1429 | range->start = newer_off; | |
09cbfeaf | 1430 | i = (newer_off & new_align) >> PAGE_SHIFT; |
4cb5300b CM |
1431 | } else { |
1432 | break; | |
f46b5a66 | 1433 | } |
4cb5300b | 1434 | } else { |
008873ea | 1435 | if (ret > 0) { |
cbcc8326 | 1436 | i += ret; |
09cbfeaf | 1437 | last_len += ret << PAGE_SHIFT; |
008873ea | 1438 | } else { |
cbcc8326 | 1439 | i++; |
008873ea LZ |
1440 | last_len = 0; |
1441 | } | |
f46b5a66 | 1442 | } |
f46b5a66 CH |
1443 | } |
1444 | ||
dec8ef90 | 1445 | if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { |
1e701a32 | 1446 | filemap_flush(inode->i_mapping); |
dec8ef90 FM |
1447 | if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, |
1448 | &BTRFS_I(inode)->runtime_flags)) | |
1449 | filemap_flush(inode->i_mapping); | |
1450 | } | |
1e701a32 CM |
1451 | |
1452 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
1453 | /* the filemap_flush will queue IO into the worker threads, but | |
1454 | * we have to make sure the IO is actually started and that | |
1455 | * ordered extents get created before we return | |
1456 | */ | |
1457 | atomic_inc(&root->fs_info->async_submit_draining); | |
1458 | while (atomic_read(&root->fs_info->nr_async_submits) || | |
1459 | atomic_read(&root->fs_info->async_delalloc_pages)) { | |
1460 | wait_event(root->fs_info->async_submit_wait, | |
1461 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && | |
1462 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); | |
1463 | } | |
1464 | atomic_dec(&root->fs_info->async_submit_draining); | |
1e701a32 CM |
1465 | } |
1466 | ||
1a419d85 | 1467 | if (range->compress_type == BTRFS_COMPRESS_LZO) { |
2b0ce2c2 | 1468 | btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); |
1a419d85 LZ |
1469 | } |
1470 | ||
60ccf82f | 1471 | ret = defrag_count; |
940100a4 | 1472 | |
4cb5300b | 1473 | out_ra: |
633085c7 | 1474 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { |
5955102c | 1475 | inode_lock(inode); |
633085c7 | 1476 | BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; |
5955102c | 1477 | inode_unlock(inode); |
633085c7 | 1478 | } |
4cb5300b CM |
1479 | if (!file) |
1480 | kfree(ra); | |
1481 | kfree(pages); | |
940100a4 | 1482 | return ret; |
f46b5a66 CH |
1483 | } |
1484 | ||
198605a8 | 1485 | static noinline int btrfs_ioctl_resize(struct file *file, |
76dda93c | 1486 | void __user *arg) |
f46b5a66 CH |
1487 | { |
1488 | u64 new_size; | |
1489 | u64 old_size; | |
1490 | u64 devid = 1; | |
496ad9aa | 1491 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
f46b5a66 CH |
1492 | struct btrfs_ioctl_vol_args *vol_args; |
1493 | struct btrfs_trans_handle *trans; | |
1494 | struct btrfs_device *device = NULL; | |
1495 | char *sizestr; | |
9a40f122 | 1496 | char *retptr; |
f46b5a66 CH |
1497 | char *devstr = NULL; |
1498 | int ret = 0; | |
f46b5a66 CH |
1499 | int mod = 0; |
1500 | ||
e441d54d CM |
1501 | if (!capable(CAP_SYS_ADMIN)) |
1502 | return -EPERM; | |
1503 | ||
198605a8 MX |
1504 | ret = mnt_want_write_file(file); |
1505 | if (ret) | |
1506 | return ret; | |
1507 | ||
5ac00add SB |
1508 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
1509 | 1)) { | |
97547676 | 1510 | mnt_drop_write_file(file); |
e57138b3 | 1511 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
c9e9f97b ID |
1512 | } |
1513 | ||
5ac00add | 1514 | mutex_lock(&root->fs_info->volume_mutex); |
dae7b665 | 1515 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
1516 | if (IS_ERR(vol_args)) { |
1517 | ret = PTR_ERR(vol_args); | |
1518 | goto out; | |
1519 | } | |
5516e595 MF |
1520 | |
1521 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 1522 | |
f46b5a66 CH |
1523 | sizestr = vol_args->name; |
1524 | devstr = strchr(sizestr, ':'); | |
1525 | if (devstr) { | |
f46b5a66 CH |
1526 | sizestr = devstr + 1; |
1527 | *devstr = '\0'; | |
1528 | devstr = vol_args->name; | |
58dfae63 Z |
1529 | ret = kstrtoull(devstr, 10, &devid); |
1530 | if (ret) | |
1531 | goto out_free; | |
dfd79829 MX |
1532 | if (!devid) { |
1533 | ret = -EINVAL; | |
1534 | goto out_free; | |
1535 | } | |
efe120a0 | 1536 | btrfs_info(root->fs_info, "resizing devid %llu", devid); |
f46b5a66 | 1537 | } |
dba60f3f | 1538 | |
aa1b8cd4 | 1539 | device = btrfs_find_device(root->fs_info, devid, NULL, NULL); |
f46b5a66 | 1540 | if (!device) { |
efe120a0 | 1541 | btrfs_info(root->fs_info, "resizer unable to find device %llu", |
c1c9ff7c | 1542 | devid); |
dfd79829 | 1543 | ret = -ENODEV; |
c9e9f97b | 1544 | goto out_free; |
f46b5a66 | 1545 | } |
dba60f3f MX |
1546 | |
1547 | if (!device->writeable) { | |
efe120a0 FH |
1548 | btrfs_info(root->fs_info, |
1549 | "resizer unable to apply on readonly device %llu", | |
c1c9ff7c | 1550 | devid); |
dfd79829 | 1551 | ret = -EPERM; |
4e42ae1b LB |
1552 | goto out_free; |
1553 | } | |
1554 | ||
f46b5a66 CH |
1555 | if (!strcmp(sizestr, "max")) |
1556 | new_size = device->bdev->bd_inode->i_size; | |
1557 | else { | |
1558 | if (sizestr[0] == '-') { | |
1559 | mod = -1; | |
1560 | sizestr++; | |
1561 | } else if (sizestr[0] == '+') { | |
1562 | mod = 1; | |
1563 | sizestr++; | |
1564 | } | |
9a40f122 GH |
1565 | new_size = memparse(sizestr, &retptr); |
1566 | if (*retptr != '\0' || new_size == 0) { | |
f46b5a66 | 1567 | ret = -EINVAL; |
c9e9f97b | 1568 | goto out_free; |
f46b5a66 CH |
1569 | } |
1570 | } | |
1571 | ||
63a212ab | 1572 | if (device->is_tgtdev_for_dev_replace) { |
dfd79829 | 1573 | ret = -EPERM; |
63a212ab SB |
1574 | goto out_free; |
1575 | } | |
1576 | ||
7cc8e58d | 1577 | old_size = btrfs_device_get_total_bytes(device); |
f46b5a66 CH |
1578 | |
1579 | if (mod < 0) { | |
1580 | if (new_size > old_size) { | |
1581 | ret = -EINVAL; | |
c9e9f97b | 1582 | goto out_free; |
f46b5a66 CH |
1583 | } |
1584 | new_size = old_size - new_size; | |
1585 | } else if (mod > 0) { | |
eb8052e0 | 1586 | if (new_size > ULLONG_MAX - old_size) { |
902c68a4 | 1587 | ret = -ERANGE; |
eb8052e0 WF |
1588 | goto out_free; |
1589 | } | |
f46b5a66 CH |
1590 | new_size = old_size + new_size; |
1591 | } | |
1592 | ||
ee22184b | 1593 | if (new_size < SZ_256M) { |
f46b5a66 | 1594 | ret = -EINVAL; |
c9e9f97b | 1595 | goto out_free; |
f46b5a66 CH |
1596 | } |
1597 | if (new_size > device->bdev->bd_inode->i_size) { | |
1598 | ret = -EFBIG; | |
c9e9f97b | 1599 | goto out_free; |
f46b5a66 CH |
1600 | } |
1601 | ||
b8b93add | 1602 | new_size = div_u64(new_size, root->sectorsize); |
f46b5a66 CH |
1603 | new_size *= root->sectorsize; |
1604 | ||
ecaeb14b | 1605 | btrfs_info_in_rcu(root->fs_info, "new size for %s is %llu", |
c1c9ff7c | 1606 | rcu_str_deref(device->name), new_size); |
f46b5a66 CH |
1607 | |
1608 | if (new_size > old_size) { | |
a22285a6 | 1609 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1610 | if (IS_ERR(trans)) { |
1611 | ret = PTR_ERR(trans); | |
c9e9f97b | 1612 | goto out_free; |
98d5dc13 | 1613 | } |
f46b5a66 CH |
1614 | ret = btrfs_grow_device(trans, device, new_size); |
1615 | btrfs_commit_transaction(trans, root); | |
ece7d20e | 1616 | } else if (new_size < old_size) { |
f46b5a66 | 1617 | ret = btrfs_shrink_device(device, new_size); |
0253f40e | 1618 | } /* equal, nothing need to do */ |
f46b5a66 | 1619 | |
c9e9f97b | 1620 | out_free: |
f46b5a66 | 1621 | kfree(vol_args); |
c9e9f97b ID |
1622 | out: |
1623 | mutex_unlock(&root->fs_info->volume_mutex); | |
5ac00add | 1624 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
18f39c41 | 1625 | mnt_drop_write_file(file); |
f46b5a66 CH |
1626 | return ret; |
1627 | } | |
1628 | ||
72fd032e | 1629 | static noinline int btrfs_ioctl_snap_create_transid(struct file *file, |
6f72c7e2 AJ |
1630 | char *name, unsigned long fd, int subvol, |
1631 | u64 *transid, bool readonly, | |
8696c533 | 1632 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 | 1633 | { |
f46b5a66 | 1634 | int namelen; |
3de4586c | 1635 | int ret = 0; |
f46b5a66 | 1636 | |
a874a63e LB |
1637 | ret = mnt_want_write_file(file); |
1638 | if (ret) | |
1639 | goto out; | |
1640 | ||
72fd032e SW |
1641 | namelen = strlen(name); |
1642 | if (strchr(name, '/')) { | |
f46b5a66 | 1643 | ret = -EINVAL; |
a874a63e | 1644 | goto out_drop_write; |
f46b5a66 CH |
1645 | } |
1646 | ||
16780cab CM |
1647 | if (name[0] == '.' && |
1648 | (namelen == 1 || (name[1] == '.' && namelen == 2))) { | |
1649 | ret = -EEXIST; | |
a874a63e | 1650 | goto out_drop_write; |
16780cab CM |
1651 | } |
1652 | ||
3de4586c | 1653 | if (subvol) { |
72fd032e | 1654 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
6f72c7e2 | 1655 | NULL, transid, readonly, inherit); |
cb8e7090 | 1656 | } else { |
2903ff01 | 1657 | struct fd src = fdget(fd); |
3de4586c | 1658 | struct inode *src_inode; |
2903ff01 | 1659 | if (!src.file) { |
3de4586c | 1660 | ret = -EINVAL; |
a874a63e | 1661 | goto out_drop_write; |
3de4586c CM |
1662 | } |
1663 | ||
496ad9aa AV |
1664 | src_inode = file_inode(src.file); |
1665 | if (src_inode->i_sb != file_inode(file)->i_sb) { | |
c79b4713 | 1666 | btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, |
efe120a0 | 1667 | "Snapshot src from another FS"); |
23ad5b17 | 1668 | ret = -EXDEV; |
d0242061 DS |
1669 | } else if (!inode_owner_or_capable(src_inode)) { |
1670 | /* | |
1671 | * Subvolume creation is not restricted, but snapshots | |
1672 | * are limited to own subvolumes only | |
1673 | */ | |
1674 | ret = -EPERM; | |
ecd18815 AV |
1675 | } else { |
1676 | ret = btrfs_mksubvol(&file->f_path, name, namelen, | |
1677 | BTRFS_I(src_inode)->root, | |
1678 | transid, readonly, inherit); | |
3de4586c | 1679 | } |
2903ff01 | 1680 | fdput(src); |
cb8e7090 | 1681 | } |
a874a63e LB |
1682 | out_drop_write: |
1683 | mnt_drop_write_file(file); | |
f46b5a66 | 1684 | out: |
72fd032e SW |
1685 | return ret; |
1686 | } | |
1687 | ||
1688 | static noinline int btrfs_ioctl_snap_create(struct file *file, | |
fa0d2b9b | 1689 | void __user *arg, int subvol) |
72fd032e | 1690 | { |
fa0d2b9b | 1691 | struct btrfs_ioctl_vol_args *vol_args; |
72fd032e SW |
1692 | int ret; |
1693 | ||
fa0d2b9b LZ |
1694 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1695 | if (IS_ERR(vol_args)) | |
1696 | return PTR_ERR(vol_args); | |
1697 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
72fd032e | 1698 | |
fa0d2b9b | 1699 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, |
b83cc969 | 1700 | vol_args->fd, subvol, |
6f72c7e2 | 1701 | NULL, false, NULL); |
fdfb1e4f | 1702 | |
fa0d2b9b LZ |
1703 | kfree(vol_args); |
1704 | return ret; | |
1705 | } | |
fdfb1e4f | 1706 | |
fa0d2b9b LZ |
1707 | static noinline int btrfs_ioctl_snap_create_v2(struct file *file, |
1708 | void __user *arg, int subvol) | |
1709 | { | |
1710 | struct btrfs_ioctl_vol_args_v2 *vol_args; | |
1711 | int ret; | |
1712 | u64 transid = 0; | |
1713 | u64 *ptr = NULL; | |
b83cc969 | 1714 | bool readonly = false; |
6f72c7e2 | 1715 | struct btrfs_qgroup_inherit *inherit = NULL; |
75eaa0e2 | 1716 | |
fa0d2b9b LZ |
1717 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1718 | if (IS_ERR(vol_args)) | |
1719 | return PTR_ERR(vol_args); | |
1720 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; | |
75eaa0e2 | 1721 | |
b83cc969 | 1722 | if (vol_args->flags & |
6f72c7e2 AJ |
1723 | ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | |
1724 | BTRFS_SUBVOL_QGROUP_INHERIT)) { | |
b83cc969 | 1725 | ret = -EOPNOTSUPP; |
c47ca32d | 1726 | goto free_args; |
72fd032e | 1727 | } |
fa0d2b9b LZ |
1728 | |
1729 | if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) | |
1730 | ptr = &transid; | |
b83cc969 LZ |
1731 | if (vol_args->flags & BTRFS_SUBVOL_RDONLY) |
1732 | readonly = true; | |
6f72c7e2 | 1733 | if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { |
09cbfeaf | 1734 | if (vol_args->size > PAGE_SIZE) { |
6f72c7e2 | 1735 | ret = -EINVAL; |
c47ca32d | 1736 | goto free_args; |
6f72c7e2 AJ |
1737 | } |
1738 | inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); | |
1739 | if (IS_ERR(inherit)) { | |
1740 | ret = PTR_ERR(inherit); | |
c47ca32d | 1741 | goto free_args; |
6f72c7e2 AJ |
1742 | } |
1743 | } | |
fa0d2b9b LZ |
1744 | |
1745 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, | |
6f72c7e2 | 1746 | vol_args->fd, subvol, ptr, |
8696c533 | 1747 | readonly, inherit); |
c47ca32d DC |
1748 | if (ret) |
1749 | goto free_inherit; | |
fa0d2b9b | 1750 | |
c47ca32d DC |
1751 | if (ptr && copy_to_user(arg + |
1752 | offsetof(struct btrfs_ioctl_vol_args_v2, | |
1753 | transid), | |
1754 | ptr, sizeof(*ptr))) | |
fa0d2b9b | 1755 | ret = -EFAULT; |
c47ca32d DC |
1756 | |
1757 | free_inherit: | |
6f72c7e2 | 1758 | kfree(inherit); |
c47ca32d DC |
1759 | free_args: |
1760 | kfree(vol_args); | |
f46b5a66 CH |
1761 | return ret; |
1762 | } | |
1763 | ||
0caa102d LZ |
1764 | static noinline int btrfs_ioctl_subvol_getflags(struct file *file, |
1765 | void __user *arg) | |
1766 | { | |
496ad9aa | 1767 | struct inode *inode = file_inode(file); |
0caa102d LZ |
1768 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1769 | int ret = 0; | |
1770 | u64 flags = 0; | |
1771 | ||
33345d01 | 1772 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) |
0caa102d LZ |
1773 | return -EINVAL; |
1774 | ||
1775 | down_read(&root->fs_info->subvol_sem); | |
1776 | if (btrfs_root_readonly(root)) | |
1777 | flags |= BTRFS_SUBVOL_RDONLY; | |
1778 | up_read(&root->fs_info->subvol_sem); | |
1779 | ||
1780 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
1781 | ret = -EFAULT; | |
1782 | ||
1783 | return ret; | |
1784 | } | |
1785 | ||
1786 | static noinline int btrfs_ioctl_subvol_setflags(struct file *file, | |
1787 | void __user *arg) | |
1788 | { | |
496ad9aa | 1789 | struct inode *inode = file_inode(file); |
0caa102d LZ |
1790 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1791 | struct btrfs_trans_handle *trans; | |
1792 | u64 root_flags; | |
1793 | u64 flags; | |
1794 | int ret = 0; | |
1795 | ||
bd60ea0f DS |
1796 | if (!inode_owner_or_capable(inode)) |
1797 | return -EPERM; | |
1798 | ||
b9ca0664 LB |
1799 | ret = mnt_want_write_file(file); |
1800 | if (ret) | |
1801 | goto out; | |
0caa102d | 1802 | |
b9ca0664 LB |
1803 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
1804 | ret = -EINVAL; | |
1805 | goto out_drop_write; | |
1806 | } | |
0caa102d | 1807 | |
b9ca0664 LB |
1808 | if (copy_from_user(&flags, arg, sizeof(flags))) { |
1809 | ret = -EFAULT; | |
1810 | goto out_drop_write; | |
1811 | } | |
0caa102d | 1812 | |
b9ca0664 LB |
1813 | if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { |
1814 | ret = -EINVAL; | |
1815 | goto out_drop_write; | |
1816 | } | |
0caa102d | 1817 | |
b9ca0664 LB |
1818 | if (flags & ~BTRFS_SUBVOL_RDONLY) { |
1819 | ret = -EOPNOTSUPP; | |
1820 | goto out_drop_write; | |
1821 | } | |
0caa102d LZ |
1822 | |
1823 | down_write(&root->fs_info->subvol_sem); | |
1824 | ||
1825 | /* nothing to do */ | |
1826 | if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) | |
b9ca0664 | 1827 | goto out_drop_sem; |
0caa102d LZ |
1828 | |
1829 | root_flags = btrfs_root_flags(&root->root_item); | |
2c686537 | 1830 | if (flags & BTRFS_SUBVOL_RDONLY) { |
0caa102d LZ |
1831 | btrfs_set_root_flags(&root->root_item, |
1832 | root_flags | BTRFS_ROOT_SUBVOL_RDONLY); | |
2c686537 DS |
1833 | } else { |
1834 | /* | |
1835 | * Block RO -> RW transition if this subvolume is involved in | |
1836 | * send | |
1837 | */ | |
1838 | spin_lock(&root->root_item_lock); | |
1839 | if (root->send_in_progress == 0) { | |
1840 | btrfs_set_root_flags(&root->root_item, | |
0caa102d | 1841 | root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); |
2c686537 DS |
1842 | spin_unlock(&root->root_item_lock); |
1843 | } else { | |
1844 | spin_unlock(&root->root_item_lock); | |
1845 | btrfs_warn(root->fs_info, | |
1846 | "Attempt to set subvolume %llu read-write during send", | |
1847 | root->root_key.objectid); | |
1848 | ret = -EPERM; | |
1849 | goto out_drop_sem; | |
1850 | } | |
1851 | } | |
0caa102d LZ |
1852 | |
1853 | trans = btrfs_start_transaction(root, 1); | |
1854 | if (IS_ERR(trans)) { | |
1855 | ret = PTR_ERR(trans); | |
1856 | goto out_reset; | |
1857 | } | |
1858 | ||
b4dc2b8c | 1859 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
0caa102d LZ |
1860 | &root->root_key, &root->root_item); |
1861 | ||
1862 | btrfs_commit_transaction(trans, root); | |
1863 | out_reset: | |
1864 | if (ret) | |
1865 | btrfs_set_root_flags(&root->root_item, root_flags); | |
b9ca0664 | 1866 | out_drop_sem: |
0caa102d | 1867 | up_write(&root->fs_info->subvol_sem); |
b9ca0664 LB |
1868 | out_drop_write: |
1869 | mnt_drop_write_file(file); | |
1870 | out: | |
0caa102d LZ |
1871 | return ret; |
1872 | } | |
1873 | ||
76dda93c YZ |
1874 | /* |
1875 | * helper to check if the subvolume references other subvolumes | |
1876 | */ | |
1877 | static noinline int may_destroy_subvol(struct btrfs_root *root) | |
1878 | { | |
1879 | struct btrfs_path *path; | |
175a2b87 | 1880 | struct btrfs_dir_item *di; |
76dda93c | 1881 | struct btrfs_key key; |
175a2b87 | 1882 | u64 dir_id; |
76dda93c YZ |
1883 | int ret; |
1884 | ||
1885 | path = btrfs_alloc_path(); | |
1886 | if (!path) | |
1887 | return -ENOMEM; | |
1888 | ||
175a2b87 JB |
1889 | /* Make sure this root isn't set as the default subvol */ |
1890 | dir_id = btrfs_super_root_dir(root->fs_info->super_copy); | |
1891 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, | |
1892 | dir_id, "default", 7, 0); | |
1893 | if (di && !IS_ERR(di)) { | |
1894 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); | |
1895 | if (key.objectid == root->root_key.objectid) { | |
72de6b53 GS |
1896 | ret = -EPERM; |
1897 | btrfs_err(root->fs_info, "deleting default subvolume " | |
1898 | "%llu is not allowed", key.objectid); | |
175a2b87 JB |
1899 | goto out; |
1900 | } | |
1901 | btrfs_release_path(path); | |
1902 | } | |
1903 | ||
76dda93c YZ |
1904 | key.objectid = root->root_key.objectid; |
1905 | key.type = BTRFS_ROOT_REF_KEY; | |
1906 | key.offset = (u64)-1; | |
1907 | ||
1908 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, | |
1909 | &key, path, 0, 0); | |
1910 | if (ret < 0) | |
1911 | goto out; | |
1912 | BUG_ON(ret == 0); | |
1913 | ||
1914 | ret = 0; | |
1915 | if (path->slots[0] > 0) { | |
1916 | path->slots[0]--; | |
1917 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1918 | if (key.objectid == root->root_key.objectid && | |
1919 | key.type == BTRFS_ROOT_REF_KEY) | |
1920 | ret = -ENOTEMPTY; | |
1921 | } | |
1922 | out: | |
1923 | btrfs_free_path(path); | |
1924 | return ret; | |
1925 | } | |
1926 | ||
ac8e9819 CM |
1927 | static noinline int key_in_sk(struct btrfs_key *key, |
1928 | struct btrfs_ioctl_search_key *sk) | |
1929 | { | |
abc6e134 CM |
1930 | struct btrfs_key test; |
1931 | int ret; | |
1932 | ||
1933 | test.objectid = sk->min_objectid; | |
1934 | test.type = sk->min_type; | |
1935 | test.offset = sk->min_offset; | |
1936 | ||
1937 | ret = btrfs_comp_cpu_keys(key, &test); | |
1938 | if (ret < 0) | |
ac8e9819 | 1939 | return 0; |
abc6e134 CM |
1940 | |
1941 | test.objectid = sk->max_objectid; | |
1942 | test.type = sk->max_type; | |
1943 | test.offset = sk->max_offset; | |
1944 | ||
1945 | ret = btrfs_comp_cpu_keys(key, &test); | |
1946 | if (ret > 0) | |
ac8e9819 CM |
1947 | return 0; |
1948 | return 1; | |
1949 | } | |
1950 | ||
df397565 | 1951 | static noinline int copy_to_sk(struct btrfs_path *path, |
ac8e9819 CM |
1952 | struct btrfs_key *key, |
1953 | struct btrfs_ioctl_search_key *sk, | |
9b6e817d | 1954 | size_t *buf_size, |
ba346b35 | 1955 | char __user *ubuf, |
ac8e9819 CM |
1956 | unsigned long *sk_offset, |
1957 | int *num_found) | |
1958 | { | |
1959 | u64 found_transid; | |
1960 | struct extent_buffer *leaf; | |
1961 | struct btrfs_ioctl_search_header sh; | |
dd81d459 | 1962 | struct btrfs_key test; |
ac8e9819 CM |
1963 | unsigned long item_off; |
1964 | unsigned long item_len; | |
1965 | int nritems; | |
1966 | int i; | |
1967 | int slot; | |
ac8e9819 CM |
1968 | int ret = 0; |
1969 | ||
1970 | leaf = path->nodes[0]; | |
1971 | slot = path->slots[0]; | |
1972 | nritems = btrfs_header_nritems(leaf); | |
1973 | ||
1974 | if (btrfs_header_generation(leaf) > sk->max_transid) { | |
1975 | i = nritems; | |
1976 | goto advance_key; | |
1977 | } | |
1978 | found_transid = btrfs_header_generation(leaf); | |
1979 | ||
1980 | for (i = slot; i < nritems; i++) { | |
1981 | item_off = btrfs_item_ptr_offset(leaf, i); | |
1982 | item_len = btrfs_item_size_nr(leaf, i); | |
1983 | ||
03b71c6c GP |
1984 | btrfs_item_key_to_cpu(leaf, key, i); |
1985 | if (!key_in_sk(key, sk)) | |
1986 | continue; | |
1987 | ||
9b6e817d | 1988 | if (sizeof(sh) + item_len > *buf_size) { |
8f5f6178 GH |
1989 | if (*num_found) { |
1990 | ret = 1; | |
1991 | goto out; | |
1992 | } | |
1993 | ||
1994 | /* | |
1995 | * return one empty item back for v1, which does not | |
1996 | * handle -EOVERFLOW | |
1997 | */ | |
1998 | ||
9b6e817d | 1999 | *buf_size = sizeof(sh) + item_len; |
ac8e9819 | 2000 | item_len = 0; |
8f5f6178 GH |
2001 | ret = -EOVERFLOW; |
2002 | } | |
ac8e9819 | 2003 | |
9b6e817d | 2004 | if (sizeof(sh) + item_len + *sk_offset > *buf_size) { |
ac8e9819 | 2005 | ret = 1; |
25c9bc2e | 2006 | goto out; |
ac8e9819 CM |
2007 | } |
2008 | ||
ac8e9819 CM |
2009 | sh.objectid = key->objectid; |
2010 | sh.offset = key->offset; | |
2011 | sh.type = key->type; | |
2012 | sh.len = item_len; | |
2013 | sh.transid = found_transid; | |
2014 | ||
2015 | /* copy search result header */ | |
ba346b35 GH |
2016 | if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) { |
2017 | ret = -EFAULT; | |
2018 | goto out; | |
2019 | } | |
2020 | ||
ac8e9819 CM |
2021 | *sk_offset += sizeof(sh); |
2022 | ||
2023 | if (item_len) { | |
ba346b35 | 2024 | char __user *up = ubuf + *sk_offset; |
ac8e9819 | 2025 | /* copy the item */ |
ba346b35 GH |
2026 | if (read_extent_buffer_to_user(leaf, up, |
2027 | item_off, item_len)) { | |
2028 | ret = -EFAULT; | |
2029 | goto out; | |
2030 | } | |
2031 | ||
ac8e9819 | 2032 | *sk_offset += item_len; |
ac8e9819 | 2033 | } |
e2156867 | 2034 | (*num_found)++; |
ac8e9819 | 2035 | |
8f5f6178 GH |
2036 | if (ret) /* -EOVERFLOW from above */ |
2037 | goto out; | |
2038 | ||
25c9bc2e GH |
2039 | if (*num_found >= sk->nr_items) { |
2040 | ret = 1; | |
2041 | goto out; | |
2042 | } | |
ac8e9819 CM |
2043 | } |
2044 | advance_key: | |
abc6e134 | 2045 | ret = 0; |
dd81d459 NA |
2046 | test.objectid = sk->max_objectid; |
2047 | test.type = sk->max_type; | |
2048 | test.offset = sk->max_offset; | |
2049 | if (btrfs_comp_cpu_keys(key, &test) >= 0) | |
2050 | ret = 1; | |
2051 | else if (key->offset < (u64)-1) | |
ac8e9819 | 2052 | key->offset++; |
dd81d459 | 2053 | else if (key->type < (u8)-1) { |
abc6e134 | 2054 | key->offset = 0; |
ac8e9819 | 2055 | key->type++; |
dd81d459 | 2056 | } else if (key->objectid < (u64)-1) { |
abc6e134 CM |
2057 | key->offset = 0; |
2058 | key->type = 0; | |
ac8e9819 | 2059 | key->objectid++; |
abc6e134 CM |
2060 | } else |
2061 | ret = 1; | |
25c9bc2e | 2062 | out: |
ba346b35 GH |
2063 | /* |
2064 | * 0: all items from this leaf copied, continue with next | |
2065 | * 1: * more items can be copied, but unused buffer is too small | |
2066 | * * all items were found | |
2067 | * Either way, it will stops the loop which iterates to the next | |
2068 | * leaf | |
2069 | * -EOVERFLOW: item was to large for buffer | |
2070 | * -EFAULT: could not copy extent buffer back to userspace | |
2071 | */ | |
ac8e9819 CM |
2072 | return ret; |
2073 | } | |
2074 | ||
2075 | static noinline int search_ioctl(struct inode *inode, | |
12544442 | 2076 | struct btrfs_ioctl_search_key *sk, |
9b6e817d | 2077 | size_t *buf_size, |
ba346b35 | 2078 | char __user *ubuf) |
ac8e9819 CM |
2079 | { |
2080 | struct btrfs_root *root; | |
2081 | struct btrfs_key key; | |
ac8e9819 | 2082 | struct btrfs_path *path; |
ac8e9819 CM |
2083 | struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; |
2084 | int ret; | |
2085 | int num_found = 0; | |
2086 | unsigned long sk_offset = 0; | |
2087 | ||
9b6e817d GH |
2088 | if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { |
2089 | *buf_size = sizeof(struct btrfs_ioctl_search_header); | |
12544442 | 2090 | return -EOVERFLOW; |
9b6e817d | 2091 | } |
12544442 | 2092 | |
ac8e9819 CM |
2093 | path = btrfs_alloc_path(); |
2094 | if (!path) | |
2095 | return -ENOMEM; | |
2096 | ||
2097 | if (sk->tree_id == 0) { | |
2098 | /* search the root of the inode that was passed */ | |
2099 | root = BTRFS_I(inode)->root; | |
2100 | } else { | |
2101 | key.objectid = sk->tree_id; | |
2102 | key.type = BTRFS_ROOT_ITEM_KEY; | |
2103 | key.offset = (u64)-1; | |
2104 | root = btrfs_read_fs_root_no_name(info, &key); | |
2105 | if (IS_ERR(root)) { | |
ac8e9819 CM |
2106 | btrfs_free_path(path); |
2107 | return -ENOENT; | |
2108 | } | |
2109 | } | |
2110 | ||
2111 | key.objectid = sk->min_objectid; | |
2112 | key.type = sk->min_type; | |
2113 | key.offset = sk->min_offset; | |
2114 | ||
67871254 | 2115 | while (1) { |
6174d3cb | 2116 | ret = btrfs_search_forward(root, &key, path, sk->min_transid); |
ac8e9819 CM |
2117 | if (ret != 0) { |
2118 | if (ret > 0) | |
2119 | ret = 0; | |
2120 | goto err; | |
2121 | } | |
df397565 | 2122 | ret = copy_to_sk(path, &key, sk, buf_size, ubuf, |
ac8e9819 | 2123 | &sk_offset, &num_found); |
b3b4aa74 | 2124 | btrfs_release_path(path); |
25c9bc2e | 2125 | if (ret) |
ac8e9819 CM |
2126 | break; |
2127 | ||
2128 | } | |
8f5f6178 GH |
2129 | if (ret > 0) |
2130 | ret = 0; | |
ac8e9819 CM |
2131 | err: |
2132 | sk->nr_items = num_found; | |
2133 | btrfs_free_path(path); | |
2134 | return ret; | |
2135 | } | |
2136 | ||
2137 | static noinline int btrfs_ioctl_tree_search(struct file *file, | |
2138 | void __user *argp) | |
2139 | { | |
ba346b35 GH |
2140 | struct btrfs_ioctl_search_args __user *uargs; |
2141 | struct btrfs_ioctl_search_key sk; | |
9b6e817d GH |
2142 | struct inode *inode; |
2143 | int ret; | |
2144 | size_t buf_size; | |
ac8e9819 CM |
2145 | |
2146 | if (!capable(CAP_SYS_ADMIN)) | |
2147 | return -EPERM; | |
2148 | ||
ba346b35 GH |
2149 | uargs = (struct btrfs_ioctl_search_args __user *)argp; |
2150 | ||
2151 | if (copy_from_user(&sk, &uargs->key, sizeof(sk))) | |
2152 | return -EFAULT; | |
ac8e9819 | 2153 | |
ba346b35 | 2154 | buf_size = sizeof(uargs->buf); |
ac8e9819 | 2155 | |
496ad9aa | 2156 | inode = file_inode(file); |
ba346b35 | 2157 | ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); |
8f5f6178 GH |
2158 | |
2159 | /* | |
2160 | * In the origin implementation an overflow is handled by returning a | |
2161 | * search header with a len of zero, so reset ret. | |
2162 | */ | |
2163 | if (ret == -EOVERFLOW) | |
2164 | ret = 0; | |
2165 | ||
ba346b35 | 2166 | if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) |
ac8e9819 | 2167 | ret = -EFAULT; |
ac8e9819 CM |
2168 | return ret; |
2169 | } | |
2170 | ||
cc68a8a5 GH |
2171 | static noinline int btrfs_ioctl_tree_search_v2(struct file *file, |
2172 | void __user *argp) | |
2173 | { | |
2174 | struct btrfs_ioctl_search_args_v2 __user *uarg; | |
2175 | struct btrfs_ioctl_search_args_v2 args; | |
2176 | struct inode *inode; | |
2177 | int ret; | |
2178 | size_t buf_size; | |
ee22184b | 2179 | const size_t buf_limit = SZ_16M; |
cc68a8a5 GH |
2180 | |
2181 | if (!capable(CAP_SYS_ADMIN)) | |
2182 | return -EPERM; | |
2183 | ||
2184 | /* copy search header and buffer size */ | |
2185 | uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; | |
2186 | if (copy_from_user(&args, uarg, sizeof(args))) | |
2187 | return -EFAULT; | |
2188 | ||
2189 | buf_size = args.buf_size; | |
2190 | ||
2191 | if (buf_size < sizeof(struct btrfs_ioctl_search_header)) | |
2192 | return -EOVERFLOW; | |
2193 | ||
2194 | /* limit result size to 16MB */ | |
2195 | if (buf_size > buf_limit) | |
2196 | buf_size = buf_limit; | |
2197 | ||
2198 | inode = file_inode(file); | |
2199 | ret = search_ioctl(inode, &args.key, &buf_size, | |
2200 | (char *)(&uarg->buf[0])); | |
2201 | if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) | |
2202 | ret = -EFAULT; | |
2203 | else if (ret == -EOVERFLOW && | |
2204 | copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) | |
2205 | ret = -EFAULT; | |
2206 | ||
ac8e9819 CM |
2207 | return ret; |
2208 | } | |
2209 | ||
98d377a0 | 2210 | /* |
ac8e9819 CM |
2211 | * Search INODE_REFs to identify path name of 'dirid' directory |
2212 | * in a 'tree_id' tree. and sets path name to 'name'. | |
2213 | */ | |
98d377a0 TH |
2214 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
2215 | u64 tree_id, u64 dirid, char *name) | |
2216 | { | |
2217 | struct btrfs_root *root; | |
2218 | struct btrfs_key key; | |
ac8e9819 | 2219 | char *ptr; |
98d377a0 TH |
2220 | int ret = -1; |
2221 | int slot; | |
2222 | int len; | |
2223 | int total_len = 0; | |
2224 | struct btrfs_inode_ref *iref; | |
2225 | struct extent_buffer *l; | |
2226 | struct btrfs_path *path; | |
2227 | ||
2228 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { | |
2229 | name[0]='\0'; | |
2230 | return 0; | |
2231 | } | |
2232 | ||
2233 | path = btrfs_alloc_path(); | |
2234 | if (!path) | |
2235 | return -ENOMEM; | |
2236 | ||
ac8e9819 | 2237 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; |
98d377a0 TH |
2238 | |
2239 | key.objectid = tree_id; | |
2240 | key.type = BTRFS_ROOT_ITEM_KEY; | |
2241 | key.offset = (u64)-1; | |
2242 | root = btrfs_read_fs_root_no_name(info, &key); | |
2243 | if (IS_ERR(root)) { | |
f14d104d | 2244 | btrfs_err(info, "could not find root %llu", tree_id); |
8ad6fcab CM |
2245 | ret = -ENOENT; |
2246 | goto out; | |
98d377a0 TH |
2247 | } |
2248 | ||
2249 | key.objectid = dirid; | |
2250 | key.type = BTRFS_INODE_REF_KEY; | |
8ad6fcab | 2251 | key.offset = (u64)-1; |
98d377a0 | 2252 | |
67871254 | 2253 | while (1) { |
98d377a0 TH |
2254 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
2255 | if (ret < 0) | |
2256 | goto out; | |
18674c6c FDBM |
2257 | else if (ret > 0) { |
2258 | ret = btrfs_previous_item(root, path, dirid, | |
2259 | BTRFS_INODE_REF_KEY); | |
2260 | if (ret < 0) | |
2261 | goto out; | |
2262 | else if (ret > 0) { | |
2263 | ret = -ENOENT; | |
2264 | goto out; | |
2265 | } | |
2266 | } | |
98d377a0 TH |
2267 | |
2268 | l = path->nodes[0]; | |
2269 | slot = path->slots[0]; | |
2270 | btrfs_item_key_to_cpu(l, &key, slot); | |
2271 | ||
98d377a0 TH |
2272 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); |
2273 | len = btrfs_inode_ref_name_len(l, iref); | |
2274 | ptr -= len + 1; | |
2275 | total_len += len + 1; | |
a696cf35 FDBM |
2276 | if (ptr < name) { |
2277 | ret = -ENAMETOOLONG; | |
98d377a0 | 2278 | goto out; |
a696cf35 | 2279 | } |
98d377a0 TH |
2280 | |
2281 | *(ptr + len) = '/'; | |
67871254 | 2282 | read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); |
98d377a0 TH |
2283 | |
2284 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) | |
2285 | break; | |
2286 | ||
b3b4aa74 | 2287 | btrfs_release_path(path); |
98d377a0 | 2288 | key.objectid = key.offset; |
8ad6fcab | 2289 | key.offset = (u64)-1; |
98d377a0 | 2290 | dirid = key.objectid; |
98d377a0 | 2291 | } |
77906a50 | 2292 | memmove(name, ptr, total_len); |
67871254 | 2293 | name[total_len] = '\0'; |
98d377a0 TH |
2294 | ret = 0; |
2295 | out: | |
2296 | btrfs_free_path(path); | |
ac8e9819 CM |
2297 | return ret; |
2298 | } | |
2299 | ||
2300 | static noinline int btrfs_ioctl_ino_lookup(struct file *file, | |
2301 | void __user *argp) | |
2302 | { | |
2303 | struct btrfs_ioctl_ino_lookup_args *args; | |
2304 | struct inode *inode; | |
01b810b8 | 2305 | int ret = 0; |
ac8e9819 | 2306 | |
2354d08f JL |
2307 | args = memdup_user(argp, sizeof(*args)); |
2308 | if (IS_ERR(args)) | |
2309 | return PTR_ERR(args); | |
c2b96929 | 2310 | |
496ad9aa | 2311 | inode = file_inode(file); |
ac8e9819 | 2312 | |
01b810b8 DS |
2313 | /* |
2314 | * Unprivileged query to obtain the containing subvolume root id. The | |
2315 | * path is reset so it's consistent with btrfs_search_path_in_tree. | |
2316 | */ | |
1b53ac4d CM |
2317 | if (args->treeid == 0) |
2318 | args->treeid = BTRFS_I(inode)->root->root_key.objectid; | |
2319 | ||
01b810b8 DS |
2320 | if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { |
2321 | args->name[0] = 0; | |
2322 | goto out; | |
2323 | } | |
2324 | ||
2325 | if (!capable(CAP_SYS_ADMIN)) { | |
2326 | ret = -EPERM; | |
2327 | goto out; | |
2328 | } | |
2329 | ||
ac8e9819 CM |
2330 | ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, |
2331 | args->treeid, args->objectid, | |
2332 | args->name); | |
2333 | ||
01b810b8 | 2334 | out: |
ac8e9819 CM |
2335 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) |
2336 | ret = -EFAULT; | |
2337 | ||
2338 | kfree(args); | |
98d377a0 TH |
2339 | return ret; |
2340 | } | |
2341 | ||
76dda93c YZ |
2342 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
2343 | void __user *arg) | |
2344 | { | |
54563d41 | 2345 | struct dentry *parent = file->f_path.dentry; |
76dda93c | 2346 | struct dentry *dentry; |
2b0143b5 | 2347 | struct inode *dir = d_inode(parent); |
76dda93c YZ |
2348 | struct inode *inode; |
2349 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2350 | struct btrfs_root *dest = NULL; | |
2351 | struct btrfs_ioctl_vol_args *vol_args; | |
2352 | struct btrfs_trans_handle *trans; | |
c58aaad2 | 2353 | struct btrfs_block_rsv block_rsv; |
521e0546 | 2354 | u64 root_flags; |
c58aaad2 | 2355 | u64 qgroup_reserved; |
76dda93c YZ |
2356 | int namelen; |
2357 | int ret; | |
2358 | int err = 0; | |
2359 | ||
76dda93c YZ |
2360 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
2361 | if (IS_ERR(vol_args)) | |
2362 | return PTR_ERR(vol_args); | |
2363 | ||
2364 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
2365 | namelen = strlen(vol_args->name); | |
2366 | if (strchr(vol_args->name, '/') || | |
2367 | strncmp(vol_args->name, "..", namelen) == 0) { | |
2368 | err = -EINVAL; | |
2369 | goto out; | |
2370 | } | |
2371 | ||
a561be71 | 2372 | err = mnt_want_write_file(file); |
76dda93c YZ |
2373 | if (err) |
2374 | goto out; | |
2375 | ||
521e0546 | 2376 | |
00235411 AV |
2377 | err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); |
2378 | if (err == -EINTR) | |
2379 | goto out_drop_write; | |
76dda93c YZ |
2380 | dentry = lookup_one_len(vol_args->name, parent, namelen); |
2381 | if (IS_ERR(dentry)) { | |
2382 | err = PTR_ERR(dentry); | |
2383 | goto out_unlock_dir; | |
2384 | } | |
2385 | ||
2b0143b5 | 2386 | if (d_really_is_negative(dentry)) { |
76dda93c YZ |
2387 | err = -ENOENT; |
2388 | goto out_dput; | |
2389 | } | |
2390 | ||
2b0143b5 | 2391 | inode = d_inode(dentry); |
4260f7c7 | 2392 | dest = BTRFS_I(inode)->root; |
67871254 | 2393 | if (!capable(CAP_SYS_ADMIN)) { |
4260f7c7 SW |
2394 | /* |
2395 | * Regular user. Only allow this with a special mount | |
2396 | * option, when the user has write+exec access to the | |
2397 | * subvol root, and when rmdir(2) would have been | |
2398 | * allowed. | |
2399 | * | |
2400 | * Note that this is _not_ check that the subvol is | |
2401 | * empty or doesn't contain data that we wouldn't | |
2402 | * otherwise be able to delete. | |
2403 | * | |
2404 | * Users who want to delete empty subvols should try | |
2405 | * rmdir(2). | |
2406 | */ | |
2407 | err = -EPERM; | |
3cdde224 | 2408 | if (!btrfs_test_opt(root->fs_info, USER_SUBVOL_RM_ALLOWED)) |
4260f7c7 SW |
2409 | goto out_dput; |
2410 | ||
2411 | /* | |
2412 | * Do not allow deletion if the parent dir is the same | |
2413 | * as the dir to be deleted. That means the ioctl | |
2414 | * must be called on the dentry referencing the root | |
2415 | * of the subvol, not a random directory contained | |
2416 | * within it. | |
2417 | */ | |
2418 | err = -EINVAL; | |
2419 | if (root == dest) | |
2420 | goto out_dput; | |
2421 | ||
2422 | err = inode_permission(inode, MAY_WRITE | MAY_EXEC); | |
2423 | if (err) | |
2424 | goto out_dput; | |
4260f7c7 SW |
2425 | } |
2426 | ||
5c39da5b MX |
2427 | /* check if subvolume may be deleted by a user */ |
2428 | err = btrfs_may_delete(dir, dentry, 1); | |
2429 | if (err) | |
2430 | goto out_dput; | |
2431 | ||
33345d01 | 2432 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
76dda93c YZ |
2433 | err = -EINVAL; |
2434 | goto out_dput; | |
2435 | } | |
2436 | ||
5955102c | 2437 | inode_lock(inode); |
521e0546 DS |
2438 | |
2439 | /* | |
2440 | * Don't allow to delete a subvolume with send in progress. This is | |
2441 | * inside the i_mutex so the error handling that has to drop the bit | |
2442 | * again is not run concurrently. | |
2443 | */ | |
2444 | spin_lock(&dest->root_item_lock); | |
c55bfa67 FM |
2445 | root_flags = btrfs_root_flags(&dest->root_item); |
2446 | if (dest->send_in_progress == 0) { | |
2447 | btrfs_set_root_flags(&dest->root_item, | |
521e0546 DS |
2448 | root_flags | BTRFS_ROOT_SUBVOL_DEAD); |
2449 | spin_unlock(&dest->root_item_lock); | |
2450 | } else { | |
2451 | spin_unlock(&dest->root_item_lock); | |
2452 | btrfs_warn(root->fs_info, | |
2453 | "Attempt to delete subvolume %llu during send", | |
c55bfa67 | 2454 | dest->root_key.objectid); |
521e0546 | 2455 | err = -EPERM; |
909e26dc | 2456 | goto out_unlock_inode; |
521e0546 DS |
2457 | } |
2458 | ||
76dda93c YZ |
2459 | down_write(&root->fs_info->subvol_sem); |
2460 | ||
2461 | err = may_destroy_subvol(dest); | |
2462 | if (err) | |
2463 | goto out_up_write; | |
2464 | ||
c58aaad2 MX |
2465 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
2466 | /* | |
2467 | * One for dir inode, two for dir entries, two for root | |
2468 | * ref/backref. | |
2469 | */ | |
2470 | err = btrfs_subvolume_reserve_metadata(root, &block_rsv, | |
ee3441b4 | 2471 | 5, &qgroup_reserved, true); |
c58aaad2 MX |
2472 | if (err) |
2473 | goto out_up_write; | |
2474 | ||
a22285a6 YZ |
2475 | trans = btrfs_start_transaction(root, 0); |
2476 | if (IS_ERR(trans)) { | |
2477 | err = PTR_ERR(trans); | |
c58aaad2 | 2478 | goto out_release; |
a22285a6 | 2479 | } |
c58aaad2 MX |
2480 | trans->block_rsv = &block_rsv; |
2481 | trans->bytes_reserved = block_rsv.size; | |
a22285a6 | 2482 | |
2be63d5c FM |
2483 | btrfs_record_snapshot_destroy(trans, dir); |
2484 | ||
76dda93c YZ |
2485 | ret = btrfs_unlink_subvol(trans, root, dir, |
2486 | dest->root_key.objectid, | |
2487 | dentry->d_name.name, | |
2488 | dentry->d_name.len); | |
79787eaa JM |
2489 | if (ret) { |
2490 | err = ret; | |
66642832 | 2491 | btrfs_abort_transaction(trans, ret); |
79787eaa JM |
2492 | goto out_end_trans; |
2493 | } | |
76dda93c YZ |
2494 | |
2495 | btrfs_record_root_in_trans(trans, dest); | |
2496 | ||
2497 | memset(&dest->root_item.drop_progress, 0, | |
2498 | sizeof(dest->root_item.drop_progress)); | |
2499 | dest->root_item.drop_level = 0; | |
2500 | btrfs_set_root_refs(&dest->root_item, 0); | |
2501 | ||
27cdeb70 | 2502 | if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) { |
d68fc57b YZ |
2503 | ret = btrfs_insert_orphan_item(trans, |
2504 | root->fs_info->tree_root, | |
2505 | dest->root_key.objectid); | |
79787eaa | 2506 | if (ret) { |
66642832 | 2507 | btrfs_abort_transaction(trans, ret); |
79787eaa JM |
2508 | err = ret; |
2509 | goto out_end_trans; | |
2510 | } | |
d68fc57b | 2511 | } |
dd5f9615 SB |
2512 | |
2513 | ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, | |
2514 | dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, | |
2515 | dest->root_key.objectid); | |
2516 | if (ret && ret != -ENOENT) { | |
66642832 | 2517 | btrfs_abort_transaction(trans, ret); |
dd5f9615 SB |
2518 | err = ret; |
2519 | goto out_end_trans; | |
2520 | } | |
2521 | if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { | |
2522 | ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, | |
2523 | dest->root_item.received_uuid, | |
2524 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
2525 | dest->root_key.objectid); | |
2526 | if (ret && ret != -ENOENT) { | |
66642832 | 2527 | btrfs_abort_transaction(trans, ret); |
dd5f9615 SB |
2528 | err = ret; |
2529 | goto out_end_trans; | |
2530 | } | |
2531 | } | |
2532 | ||
79787eaa | 2533 | out_end_trans: |
c58aaad2 MX |
2534 | trans->block_rsv = NULL; |
2535 | trans->bytes_reserved = 0; | |
531cb13f | 2536 | ret = btrfs_end_transaction(trans, root); |
79787eaa JM |
2537 | if (ret && !err) |
2538 | err = ret; | |
76dda93c | 2539 | inode->i_flags |= S_DEAD; |
c58aaad2 MX |
2540 | out_release: |
2541 | btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); | |
76dda93c YZ |
2542 | out_up_write: |
2543 | up_write(&root->fs_info->subvol_sem); | |
521e0546 DS |
2544 | if (err) { |
2545 | spin_lock(&dest->root_item_lock); | |
c55bfa67 FM |
2546 | root_flags = btrfs_root_flags(&dest->root_item); |
2547 | btrfs_set_root_flags(&dest->root_item, | |
521e0546 DS |
2548 | root_flags & ~BTRFS_ROOT_SUBVOL_DEAD); |
2549 | spin_unlock(&dest->root_item_lock); | |
2550 | } | |
909e26dc | 2551 | out_unlock_inode: |
5955102c | 2552 | inode_unlock(inode); |
76dda93c | 2553 | if (!err) { |
64ad6c48 | 2554 | d_invalidate(dentry); |
76dda93c YZ |
2555 | btrfs_invalidate_inodes(dest); |
2556 | d_delete(dentry); | |
61155aa0 | 2557 | ASSERT(dest->send_in_progress == 0); |
fa6ac876 LB |
2558 | |
2559 | /* the last ref */ | |
57cdc8db DS |
2560 | if (dest->ino_cache_inode) { |
2561 | iput(dest->ino_cache_inode); | |
2562 | dest->ino_cache_inode = NULL; | |
fa6ac876 | 2563 | } |
76dda93c YZ |
2564 | } |
2565 | out_dput: | |
2566 | dput(dentry); | |
2567 | out_unlock_dir: | |
5955102c | 2568 | inode_unlock(dir); |
00235411 | 2569 | out_drop_write: |
2a79f17e | 2570 | mnt_drop_write_file(file); |
76dda93c YZ |
2571 | out: |
2572 | kfree(vol_args); | |
2573 | return err; | |
2574 | } | |
2575 | ||
1e701a32 | 2576 | static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
f46b5a66 | 2577 | { |
496ad9aa | 2578 | struct inode *inode = file_inode(file); |
f46b5a66 | 2579 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1e701a32 | 2580 | struct btrfs_ioctl_defrag_range_args *range; |
c146afad YZ |
2581 | int ret; |
2582 | ||
25122d15 ID |
2583 | ret = mnt_want_write_file(file); |
2584 | if (ret) | |
2585 | return ret; | |
b83cc969 | 2586 | |
25122d15 ID |
2587 | if (btrfs_root_readonly(root)) { |
2588 | ret = -EROFS; | |
2589 | goto out; | |
5ac00add | 2590 | } |
f46b5a66 CH |
2591 | |
2592 | switch (inode->i_mode & S_IFMT) { | |
2593 | case S_IFDIR: | |
e441d54d CM |
2594 | if (!capable(CAP_SYS_ADMIN)) { |
2595 | ret = -EPERM; | |
2596 | goto out; | |
2597 | } | |
de78b51a | 2598 | ret = btrfs_defrag_root(root); |
8929ecfa YZ |
2599 | if (ret) |
2600 | goto out; | |
de78b51a | 2601 | ret = btrfs_defrag_root(root->fs_info->extent_root); |
f46b5a66 CH |
2602 | break; |
2603 | case S_IFREG: | |
e441d54d CM |
2604 | if (!(file->f_mode & FMODE_WRITE)) { |
2605 | ret = -EINVAL; | |
2606 | goto out; | |
2607 | } | |
1e701a32 CM |
2608 | |
2609 | range = kzalloc(sizeof(*range), GFP_KERNEL); | |
2610 | if (!range) { | |
2611 | ret = -ENOMEM; | |
2612 | goto out; | |
2613 | } | |
2614 | ||
2615 | if (argp) { | |
2616 | if (copy_from_user(range, argp, | |
2617 | sizeof(*range))) { | |
2618 | ret = -EFAULT; | |
2619 | kfree(range); | |
683be16e | 2620 | goto out; |
1e701a32 CM |
2621 | } |
2622 | /* compression requires us to start the IO */ | |
2623 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
2624 | range->flags |= BTRFS_DEFRAG_RANGE_START_IO; | |
2625 | range->extent_thresh = (u32)-1; | |
2626 | } | |
2627 | } else { | |
2628 | /* the rest are all set to zero by kzalloc */ | |
2629 | range->len = (u64)-1; | |
2630 | } | |
496ad9aa | 2631 | ret = btrfs_defrag_file(file_inode(file), file, |
4cb5300b CM |
2632 | range, 0, 0); |
2633 | if (ret > 0) | |
2634 | ret = 0; | |
1e701a32 | 2635 | kfree(range); |
f46b5a66 | 2636 | break; |
8929ecfa YZ |
2637 | default: |
2638 | ret = -EINVAL; | |
f46b5a66 | 2639 | } |
e441d54d | 2640 | out: |
25122d15 | 2641 | mnt_drop_write_file(file); |
e441d54d | 2642 | return ret; |
f46b5a66 CH |
2643 | } |
2644 | ||
b2950863 | 2645 | static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
2646 | { |
2647 | struct btrfs_ioctl_vol_args *vol_args; | |
2648 | int ret; | |
2649 | ||
e441d54d CM |
2650 | if (!capable(CAP_SYS_ADMIN)) |
2651 | return -EPERM; | |
2652 | ||
5ac00add SB |
2653 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
2654 | 1)) { | |
e57138b3 | 2655 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
c9e9f97b ID |
2656 | } |
2657 | ||
5ac00add | 2658 | mutex_lock(&root->fs_info->volume_mutex); |
dae7b665 | 2659 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2660 | if (IS_ERR(vol_args)) { |
2661 | ret = PTR_ERR(vol_args); | |
2662 | goto out; | |
2663 | } | |
f46b5a66 | 2664 | |
5516e595 | 2665 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
2666 | ret = btrfs_init_new_device(root, vol_args->name); |
2667 | ||
43d20761 AJ |
2668 | if (!ret) |
2669 | btrfs_info(root->fs_info, "disk added %s",vol_args->name); | |
2670 | ||
f46b5a66 | 2671 | kfree(vol_args); |
c9e9f97b ID |
2672 | out: |
2673 | mutex_unlock(&root->fs_info->volume_mutex); | |
5ac00add | 2674 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
f46b5a66 CH |
2675 | return ret; |
2676 | } | |
2677 | ||
6b526ed7 | 2678 | static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) |
f46b5a66 | 2679 | { |
496ad9aa | 2680 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
6b526ed7 | 2681 | struct btrfs_ioctl_vol_args_v2 *vol_args; |
f46b5a66 CH |
2682 | int ret; |
2683 | ||
e441d54d CM |
2684 | if (!capable(CAP_SYS_ADMIN)) |
2685 | return -EPERM; | |
2686 | ||
da24927b MX |
2687 | ret = mnt_want_write_file(file); |
2688 | if (ret) | |
2689 | return ret; | |
c146afad | 2690 | |
dae7b665 | 2691 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2692 | if (IS_ERR(vol_args)) { |
2693 | ret = PTR_ERR(vol_args); | |
c47ca32d | 2694 | goto err_drop; |
c9e9f97b | 2695 | } |
f46b5a66 | 2696 | |
6b526ed7 | 2697 | /* Check for compatibility reject unknown flags */ |
735654ea DS |
2698 | if (vol_args->flags & ~BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED) |
2699 | return -EOPNOTSUPP; | |
f46b5a66 | 2700 | |
183860f6 AJ |
2701 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
2702 | 1)) { | |
2703 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; | |
2704 | goto out; | |
2705 | } | |
2706 | ||
2707 | mutex_lock(&root->fs_info->volume_mutex); | |
735654ea | 2708 | if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { |
6b526ed7 AJ |
2709 | ret = btrfs_rm_device(root, NULL, vol_args->devid); |
2710 | } else { | |
2711 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; | |
2712 | ret = btrfs_rm_device(root, vol_args->name, 0); | |
2713 | } | |
c9e9f97b | 2714 | mutex_unlock(&root->fs_info->volume_mutex); |
5ac00add | 2715 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
183860f6 | 2716 | |
6b526ed7 | 2717 | if (!ret) { |
735654ea | 2718 | if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) |
6b526ed7 AJ |
2719 | btrfs_info(root->fs_info, "device deleted: id %llu", |
2720 | vol_args->devid); | |
2721 | else | |
2722 | btrfs_info(root->fs_info, "device deleted: %s", | |
2723 | vol_args->name); | |
2724 | } | |
183860f6 AJ |
2725 | out: |
2726 | kfree(vol_args); | |
c47ca32d | 2727 | err_drop: |
4ac20c70 | 2728 | mnt_drop_write_file(file); |
f46b5a66 CH |
2729 | return ret; |
2730 | } | |
2731 | ||
da24927b | 2732 | static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) |
f46b5a66 | 2733 | { |
496ad9aa | 2734 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
f46b5a66 CH |
2735 | struct btrfs_ioctl_vol_args *vol_args; |
2736 | int ret; | |
2737 | ||
e441d54d CM |
2738 | if (!capable(CAP_SYS_ADMIN)) |
2739 | return -EPERM; | |
2740 | ||
da24927b MX |
2741 | ret = mnt_want_write_file(file); |
2742 | if (ret) | |
2743 | return ret; | |
c146afad | 2744 | |
183860f6 AJ |
2745 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
2746 | 1)) { | |
2747 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; | |
58d7bbf8 DS |
2748 | goto out_drop_write; |
2749 | } | |
2750 | ||
2751 | vol_args = memdup_user(arg, sizeof(*vol_args)); | |
2752 | if (IS_ERR(vol_args)) { | |
2753 | ret = PTR_ERR(vol_args); | |
183860f6 AJ |
2754 | goto out; |
2755 | } | |
2756 | ||
58d7bbf8 | 2757 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
183860f6 | 2758 | mutex_lock(&root->fs_info->volume_mutex); |
6b526ed7 | 2759 | ret = btrfs_rm_device(root, vol_args->name, 0); |
c9e9f97b | 2760 | mutex_unlock(&root->fs_info->volume_mutex); |
183860f6 | 2761 | |
ec95d491 AJ |
2762 | if (!ret) |
2763 | btrfs_info(root->fs_info, "disk deleted %s",vol_args->name); | |
183860f6 | 2764 | kfree(vol_args); |
58d7bbf8 DS |
2765 | out: |
2766 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); | |
2767 | out_drop_write: | |
4ac20c70 | 2768 | mnt_drop_write_file(file); |
58d7bbf8 | 2769 | |
f46b5a66 CH |
2770 | return ret; |
2771 | } | |
2772 | ||
475f6387 JS |
2773 | static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) |
2774 | { | |
027ed2f0 | 2775 | struct btrfs_ioctl_fs_info_args *fi_args; |
475f6387 | 2776 | struct btrfs_device *device; |
475f6387 | 2777 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; |
027ed2f0 | 2778 | int ret = 0; |
475f6387 | 2779 | |
027ed2f0 LZ |
2780 | fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); |
2781 | if (!fi_args) | |
2782 | return -ENOMEM; | |
2783 | ||
f7171750 | 2784 | mutex_lock(&fs_devices->device_list_mutex); |
027ed2f0 LZ |
2785 | fi_args->num_devices = fs_devices->num_devices; |
2786 | memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); | |
475f6387 | 2787 | |
d7641a49 | 2788 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
027ed2f0 LZ |
2789 | if (device->devid > fi_args->max_id) |
2790 | fi_args->max_id = device->devid; | |
475f6387 JS |
2791 | } |
2792 | mutex_unlock(&fs_devices->device_list_mutex); | |
2793 | ||
80a773fb DS |
2794 | fi_args->nodesize = root->fs_info->super_copy->nodesize; |
2795 | fi_args->sectorsize = root->fs_info->super_copy->sectorsize; | |
2796 | fi_args->clone_alignment = root->fs_info->super_copy->sectorsize; | |
2797 | ||
027ed2f0 LZ |
2798 | if (copy_to_user(arg, fi_args, sizeof(*fi_args))) |
2799 | ret = -EFAULT; | |
475f6387 | 2800 | |
027ed2f0 LZ |
2801 | kfree(fi_args); |
2802 | return ret; | |
475f6387 JS |
2803 | } |
2804 | ||
2805 | static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) | |
2806 | { | |
2807 | struct btrfs_ioctl_dev_info_args *di_args; | |
2808 | struct btrfs_device *dev; | |
2809 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
2810 | int ret = 0; | |
2811 | char *s_uuid = NULL; | |
475f6387 | 2812 | |
475f6387 JS |
2813 | di_args = memdup_user(arg, sizeof(*di_args)); |
2814 | if (IS_ERR(di_args)) | |
2815 | return PTR_ERR(di_args); | |
2816 | ||
dd5f9615 | 2817 | if (!btrfs_is_empty_uuid(di_args->uuid)) |
475f6387 JS |
2818 | s_uuid = di_args->uuid; |
2819 | ||
2820 | mutex_lock(&fs_devices->device_list_mutex); | |
aa1b8cd4 | 2821 | dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); |
475f6387 JS |
2822 | |
2823 | if (!dev) { | |
2824 | ret = -ENODEV; | |
2825 | goto out; | |
2826 | } | |
2827 | ||
2828 | di_args->devid = dev->devid; | |
7cc8e58d MX |
2829 | di_args->bytes_used = btrfs_device_get_bytes_used(dev); |
2830 | di_args->total_bytes = btrfs_device_get_total_bytes(dev); | |
475f6387 | 2831 | memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); |
a27202fb | 2832 | if (dev->name) { |
606686ee JB |
2833 | struct rcu_string *name; |
2834 | ||
2835 | rcu_read_lock(); | |
2836 | name = rcu_dereference(dev->name); | |
2837 | strncpy(di_args->path, name->str, sizeof(di_args->path)); | |
2838 | rcu_read_unlock(); | |
a27202fb JM |
2839 | di_args->path[sizeof(di_args->path) - 1] = 0; |
2840 | } else { | |
99ba55ad | 2841 | di_args->path[0] = '\0'; |
a27202fb | 2842 | } |
475f6387 JS |
2843 | |
2844 | out: | |
55793c0d | 2845 | mutex_unlock(&fs_devices->device_list_mutex); |
475f6387 JS |
2846 | if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) |
2847 | ret = -EFAULT; | |
2848 | ||
2849 | kfree(di_args); | |
2850 | return ret; | |
2851 | } | |
2852 | ||
f4414602 | 2853 | static struct page *extent_same_get_page(struct inode *inode, pgoff_t index) |
416161db MF |
2854 | { |
2855 | struct page *page; | |
416161db | 2856 | |
416161db MF |
2857 | page = grab_cache_page(inode->i_mapping, index); |
2858 | if (!page) | |
31314002 | 2859 | return ERR_PTR(-ENOMEM); |
416161db MF |
2860 | |
2861 | if (!PageUptodate(page)) { | |
31314002 FM |
2862 | int ret; |
2863 | ||
2864 | ret = btrfs_readpage(NULL, page); | |
2865 | if (ret) | |
2866 | return ERR_PTR(ret); | |
416161db MF |
2867 | lock_page(page); |
2868 | if (!PageUptodate(page)) { | |
2869 | unlock_page(page); | |
09cbfeaf | 2870 | put_page(page); |
31314002 FM |
2871 | return ERR_PTR(-EIO); |
2872 | } | |
2873 | if (page->mapping != inode->i_mapping) { | |
2874 | unlock_page(page); | |
09cbfeaf | 2875 | put_page(page); |
31314002 | 2876 | return ERR_PTR(-EAGAIN); |
416161db MF |
2877 | } |
2878 | } | |
416161db MF |
2879 | |
2880 | return page; | |
2881 | } | |
2882 | ||
f4414602 MF |
2883 | static int gather_extent_pages(struct inode *inode, struct page **pages, |
2884 | int num_pages, u64 off) | |
2885 | { | |
2886 | int i; | |
09cbfeaf | 2887 | pgoff_t index = off >> PAGE_SHIFT; |
f4414602 MF |
2888 | |
2889 | for (i = 0; i < num_pages; i++) { | |
31314002 | 2890 | again: |
f4414602 | 2891 | pages[i] = extent_same_get_page(inode, index + i); |
31314002 FM |
2892 | if (IS_ERR(pages[i])) { |
2893 | int err = PTR_ERR(pages[i]); | |
2894 | ||
2895 | if (err == -EAGAIN) | |
2896 | goto again; | |
2897 | pages[i] = NULL; | |
2898 | return err; | |
2899 | } | |
f4414602 MF |
2900 | } |
2901 | return 0; | |
2902 | } | |
2903 | ||
e0bd70c6 FM |
2904 | static int lock_extent_range(struct inode *inode, u64 off, u64 len, |
2905 | bool retry_range_locking) | |
77fe20dc | 2906 | { |
e0bd70c6 FM |
2907 | /* |
2908 | * Do any pending delalloc/csum calculations on inode, one way or | |
2909 | * another, and lock file content. | |
2910 | * The locking order is: | |
2911 | * | |
2912 | * 1) pages | |
2913 | * 2) range in the inode's io tree | |
2914 | */ | |
77fe20dc MF |
2915 | while (1) { |
2916 | struct btrfs_ordered_extent *ordered; | |
2917 | lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); | |
2918 | ordered = btrfs_lookup_first_ordered_extent(inode, | |
2919 | off + len - 1); | |
ff5df9b8 FM |
2920 | if ((!ordered || |
2921 | ordered->file_offset + ordered->len <= off || | |
2922 | ordered->file_offset >= off + len) && | |
77fe20dc | 2923 | !test_range_bit(&BTRFS_I(inode)->io_tree, off, |
ff5df9b8 FM |
2924 | off + len - 1, EXTENT_DELALLOC, 0, NULL)) { |
2925 | if (ordered) | |
2926 | btrfs_put_ordered_extent(ordered); | |
77fe20dc | 2927 | break; |
ff5df9b8 | 2928 | } |
77fe20dc MF |
2929 | unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); |
2930 | if (ordered) | |
2931 | btrfs_put_ordered_extent(ordered); | |
e0bd70c6 FM |
2932 | if (!retry_range_locking) |
2933 | return -EAGAIN; | |
77fe20dc MF |
2934 | btrfs_wait_ordered_range(inode, off, len); |
2935 | } | |
e0bd70c6 | 2936 | return 0; |
77fe20dc MF |
2937 | } |
2938 | ||
f4414602 | 2939 | static void btrfs_double_inode_unlock(struct inode *inode1, struct inode *inode2) |
416161db | 2940 | { |
5955102c AV |
2941 | inode_unlock(inode1); |
2942 | inode_unlock(inode2); | |
416161db MF |
2943 | } |
2944 | ||
f4414602 MF |
2945 | static void btrfs_double_inode_lock(struct inode *inode1, struct inode *inode2) |
2946 | { | |
2947 | if (inode1 < inode2) | |
2948 | swap(inode1, inode2); | |
2949 | ||
5955102c AV |
2950 | inode_lock_nested(inode1, I_MUTEX_PARENT); |
2951 | inode_lock_nested(inode2, I_MUTEX_CHILD); | |
f4414602 MF |
2952 | } |
2953 | ||
2954 | static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1, | |
2955 | struct inode *inode2, u64 loff2, u64 len) | |
2956 | { | |
2957 | unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); | |
2958 | unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); | |
2959 | } | |
2960 | ||
e0bd70c6 FM |
2961 | static int btrfs_double_extent_lock(struct inode *inode1, u64 loff1, |
2962 | struct inode *inode2, u64 loff2, u64 len, | |
2963 | bool retry_range_locking) | |
416161db | 2964 | { |
e0bd70c6 FM |
2965 | int ret; |
2966 | ||
416161db MF |
2967 | if (inode1 < inode2) { |
2968 | swap(inode1, inode2); | |
2969 | swap(loff1, loff2); | |
2970 | } | |
e0bd70c6 FM |
2971 | ret = lock_extent_range(inode1, loff1, len, retry_range_locking); |
2972 | if (ret) | |
2973 | return ret; | |
2974 | ret = lock_extent_range(inode2, loff2, len, retry_range_locking); | |
2975 | if (ret) | |
2976 | unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, | |
2977 | loff1 + len - 1); | |
2978 | return ret; | |
f4414602 MF |
2979 | } |
2980 | ||
2981 | struct cmp_pages { | |
2982 | int num_pages; | |
2983 | struct page **src_pages; | |
2984 | struct page **dst_pages; | |
2985 | }; | |
2986 | ||
2987 | static void btrfs_cmp_data_free(struct cmp_pages *cmp) | |
2988 | { | |
2989 | int i; | |
2990 | struct page *pg; | |
2991 | ||
2992 | for (i = 0; i < cmp->num_pages; i++) { | |
2993 | pg = cmp->src_pages[i]; | |
e0bd70c6 FM |
2994 | if (pg) { |
2995 | unlock_page(pg); | |
09cbfeaf | 2996 | put_page(pg); |
e0bd70c6 | 2997 | } |
f4414602 | 2998 | pg = cmp->dst_pages[i]; |
e0bd70c6 FM |
2999 | if (pg) { |
3000 | unlock_page(pg); | |
09cbfeaf | 3001 | put_page(pg); |
e0bd70c6 | 3002 | } |
f4414602 MF |
3003 | } |
3004 | kfree(cmp->src_pages); | |
3005 | kfree(cmp->dst_pages); | |
3006 | } | |
3007 | ||
3008 | static int btrfs_cmp_data_prepare(struct inode *src, u64 loff, | |
3009 | struct inode *dst, u64 dst_loff, | |
3010 | u64 len, struct cmp_pages *cmp) | |
3011 | { | |
3012 | int ret; | |
09cbfeaf | 3013 | int num_pages = PAGE_ALIGN(len) >> PAGE_SHIFT; |
f4414602 MF |
3014 | struct page **src_pgarr, **dst_pgarr; |
3015 | ||
3016 | /* | |
3017 | * We must gather up all the pages before we initiate our | |
3018 | * extent locking. We use an array for the page pointers. Size | |
3019 | * of the array is bounded by len, which is in turn bounded by | |
3020 | * BTRFS_MAX_DEDUPE_LEN. | |
3021 | */ | |
66722f7c DS |
3022 | src_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL); |
3023 | dst_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL); | |
f4414602 MF |
3024 | if (!src_pgarr || !dst_pgarr) { |
3025 | kfree(src_pgarr); | |
3026 | kfree(dst_pgarr); | |
3027 | return -ENOMEM; | |
416161db | 3028 | } |
f4414602 MF |
3029 | cmp->num_pages = num_pages; |
3030 | cmp->src_pages = src_pgarr; | |
3031 | cmp->dst_pages = dst_pgarr; | |
3032 | ||
3033 | ret = gather_extent_pages(src, cmp->src_pages, cmp->num_pages, loff); | |
3034 | if (ret) | |
3035 | goto out; | |
3036 | ||
3037 | ret = gather_extent_pages(dst, cmp->dst_pages, cmp->num_pages, dst_loff); | |
3038 | ||
3039 | out: | |
3040 | if (ret) | |
3041 | btrfs_cmp_data_free(cmp); | |
3042 | return 0; | |
416161db MF |
3043 | } |
3044 | ||
3045 | static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, | |
f4414602 | 3046 | u64 dst_loff, u64 len, struct cmp_pages *cmp) |
416161db MF |
3047 | { |
3048 | int ret = 0; | |
f4414602 | 3049 | int i; |
416161db | 3050 | struct page *src_page, *dst_page; |
09cbfeaf | 3051 | unsigned int cmp_len = PAGE_SIZE; |
416161db MF |
3052 | void *addr, *dst_addr; |
3053 | ||
f4414602 | 3054 | i = 0; |
416161db | 3055 | while (len) { |
09cbfeaf | 3056 | if (len < PAGE_SIZE) |
416161db MF |
3057 | cmp_len = len; |
3058 | ||
f4414602 MF |
3059 | BUG_ON(i >= cmp->num_pages); |
3060 | ||
3061 | src_page = cmp->src_pages[i]; | |
3062 | dst_page = cmp->dst_pages[i]; | |
e0bd70c6 FM |
3063 | ASSERT(PageLocked(src_page)); |
3064 | ASSERT(PageLocked(dst_page)); | |
f4414602 | 3065 | |
416161db MF |
3066 | addr = kmap_atomic(src_page); |
3067 | dst_addr = kmap_atomic(dst_page); | |
3068 | ||
3069 | flush_dcache_page(src_page); | |
3070 | flush_dcache_page(dst_page); | |
3071 | ||
3072 | if (memcmp(addr, dst_addr, cmp_len)) | |
2b3909f8 | 3073 | ret = -EBADE; |
416161db MF |
3074 | |
3075 | kunmap_atomic(addr); | |
3076 | kunmap_atomic(dst_addr); | |
416161db MF |
3077 | |
3078 | if (ret) | |
3079 | break; | |
3080 | ||
416161db | 3081 | len -= cmp_len; |
f4414602 | 3082 | i++; |
416161db MF |
3083 | } |
3084 | ||
3085 | return ret; | |
3086 | } | |
3087 | ||
e1d227a4 MF |
3088 | static int extent_same_check_offsets(struct inode *inode, u64 off, u64 *plen, |
3089 | u64 olen) | |
416161db | 3090 | { |
e1d227a4 | 3091 | u64 len = *plen; |
416161db MF |
3092 | u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; |
3093 | ||
e1d227a4 | 3094 | if (off + olen > inode->i_size || off + olen < off) |
416161db | 3095 | return -EINVAL; |
e1d227a4 MF |
3096 | |
3097 | /* if we extend to eof, continue to block boundary */ | |
3098 | if (off + len == inode->i_size) | |
3099 | *plen = len = ALIGN(inode->i_size, bs) - off; | |
3100 | ||
416161db MF |
3101 | /* Check that we are block aligned - btrfs_clone() requires this */ |
3102 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) | |
3103 | return -EINVAL; | |
3104 | ||
3105 | return 0; | |
3106 | } | |
3107 | ||
e1d227a4 | 3108 | static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, |
416161db MF |
3109 | struct inode *dst, u64 dst_loff) |
3110 | { | |
3111 | int ret; | |
e1d227a4 | 3112 | u64 len = olen; |
f4414602 | 3113 | struct cmp_pages cmp; |
0efa9f48 MF |
3114 | int same_inode = 0; |
3115 | u64 same_lock_start = 0; | |
3116 | u64 same_lock_len = 0; | |
416161db | 3117 | |
416161db | 3118 | if (src == dst) |
0efa9f48 | 3119 | same_inode = 1; |
416161db | 3120 | |
113e8283 FM |
3121 | if (len == 0) |
3122 | return 0; | |
3123 | ||
0efa9f48 | 3124 | if (same_inode) { |
5955102c | 3125 | inode_lock(src); |
416161db | 3126 | |
0efa9f48 | 3127 | ret = extent_same_check_offsets(src, loff, &len, olen); |
f4dfe687 FM |
3128 | if (ret) |
3129 | goto out_unlock; | |
3130 | ret = extent_same_check_offsets(src, dst_loff, &len, olen); | |
0efa9f48 MF |
3131 | if (ret) |
3132 | goto out_unlock; | |
416161db | 3133 | |
0efa9f48 MF |
3134 | /* |
3135 | * Single inode case wants the same checks, except we | |
3136 | * don't want our length pushed out past i_size as | |
3137 | * comparing that data range makes no sense. | |
3138 | * | |
3139 | * extent_same_check_offsets() will do this for an | |
3140 | * unaligned length at i_size, so catch it here and | |
3141 | * reject the request. | |
3142 | * | |
3143 | * This effectively means we require aligned extents | |
3144 | * for the single-inode case, whereas the other cases | |
3145 | * allow an unaligned length so long as it ends at | |
3146 | * i_size. | |
3147 | */ | |
3148 | if (len != olen) { | |
3149 | ret = -EINVAL; | |
3150 | goto out_unlock; | |
3151 | } | |
3152 | ||
3153 | /* Check for overlapping ranges */ | |
3154 | if (dst_loff + len > loff && dst_loff < loff + len) { | |
3155 | ret = -EINVAL; | |
3156 | goto out_unlock; | |
3157 | } | |
3158 | ||
3159 | same_lock_start = min_t(u64, loff, dst_loff); | |
3160 | same_lock_len = max_t(u64, loff, dst_loff) + len - same_lock_start; | |
3161 | } else { | |
3162 | btrfs_double_inode_lock(src, dst); | |
3163 | ||
3164 | ret = extent_same_check_offsets(src, loff, &len, olen); | |
3165 | if (ret) | |
3166 | goto out_unlock; | |
3167 | ||
3168 | ret = extent_same_check_offsets(dst, dst_loff, &len, olen); | |
3169 | if (ret) | |
3170 | goto out_unlock; | |
3171 | } | |
416161db MF |
3172 | |
3173 | /* don't make the dst file partly checksummed */ | |
3174 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != | |
3175 | (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { | |
3176 | ret = -EINVAL; | |
3177 | goto out_unlock; | |
3178 | } | |
3179 | ||
e0bd70c6 | 3180 | again: |
f4414602 MF |
3181 | ret = btrfs_cmp_data_prepare(src, loff, dst, dst_loff, olen, &cmp); |
3182 | if (ret) | |
3183 | goto out_unlock; | |
3184 | ||
0efa9f48 | 3185 | if (same_inode) |
e0bd70c6 FM |
3186 | ret = lock_extent_range(src, same_lock_start, same_lock_len, |
3187 | false); | |
0efa9f48 | 3188 | else |
e0bd70c6 FM |
3189 | ret = btrfs_double_extent_lock(src, loff, dst, dst_loff, len, |
3190 | false); | |
3191 | /* | |
3192 | * If one of the inodes has dirty pages in the respective range or | |
3193 | * ordered extents, we need to flush dellaloc and wait for all ordered | |
3194 | * extents in the range. We must unlock the pages and the ranges in the | |
3195 | * io trees to avoid deadlocks when flushing delalloc (requires locking | |
3196 | * pages) and when waiting for ordered extents to complete (they require | |
3197 | * range locking). | |
3198 | */ | |
3199 | if (ret == -EAGAIN) { | |
3200 | /* | |
3201 | * Ranges in the io trees already unlocked. Now unlock all | |
3202 | * pages before waiting for all IO to complete. | |
3203 | */ | |
3204 | btrfs_cmp_data_free(&cmp); | |
3205 | if (same_inode) { | |
3206 | btrfs_wait_ordered_range(src, same_lock_start, | |
3207 | same_lock_len); | |
3208 | } else { | |
3209 | btrfs_wait_ordered_range(src, loff, len); | |
3210 | btrfs_wait_ordered_range(dst, dst_loff, len); | |
3211 | } | |
3212 | goto again; | |
3213 | } | |
3214 | ASSERT(ret == 0); | |
3215 | if (WARN_ON(ret)) { | |
3216 | /* ranges in the io trees already unlocked */ | |
3217 | btrfs_cmp_data_free(&cmp); | |
3218 | return ret; | |
3219 | } | |
f4414602 | 3220 | |
207910dd | 3221 | /* pass original length for comparison so we stay within i_size */ |
f4414602 | 3222 | ret = btrfs_cmp_data(src, loff, dst, dst_loff, olen, &cmp); |
416161db | 3223 | if (ret == 0) |
1c919a5e | 3224 | ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1); |
416161db | 3225 | |
0efa9f48 MF |
3226 | if (same_inode) |
3227 | unlock_extent(&BTRFS_I(src)->io_tree, same_lock_start, | |
3228 | same_lock_start + same_lock_len - 1); | |
3229 | else | |
3230 | btrfs_double_extent_unlock(src, loff, dst, dst_loff, len); | |
f4414602 MF |
3231 | |
3232 | btrfs_cmp_data_free(&cmp); | |
416161db | 3233 | out_unlock: |
0efa9f48 | 3234 | if (same_inode) |
5955102c | 3235 | inode_unlock(src); |
0efa9f48 MF |
3236 | else |
3237 | btrfs_double_inode_unlock(src, dst); | |
416161db MF |
3238 | |
3239 | return ret; | |
3240 | } | |
3241 | ||
ee22184b | 3242 | #define BTRFS_MAX_DEDUPE_LEN SZ_16M |
416161db | 3243 | |
2b3909f8 DW |
3244 | ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen, |
3245 | struct file *dst_file, u64 dst_loff) | |
416161db | 3246 | { |
2b3909f8 DW |
3247 | struct inode *src = file_inode(src_file); |
3248 | struct inode *dst = file_inode(dst_file); | |
416161db | 3249 | u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; |
2b3909f8 | 3250 | ssize_t res; |
416161db | 3251 | |
2b3909f8 DW |
3252 | if (olen > BTRFS_MAX_DEDUPE_LEN) |
3253 | olen = BTRFS_MAX_DEDUPE_LEN; | |
416161db | 3254 | |
09cbfeaf | 3255 | if (WARN_ON_ONCE(bs < PAGE_SIZE)) { |
416161db MF |
3256 | /* |
3257 | * Btrfs does not support blocksize < page_size. As a | |
3258 | * result, btrfs_cmp_data() won't correctly handle | |
3259 | * this situation without an update. | |
3260 | */ | |
2b3909f8 | 3261 | return -EINVAL; |
416161db MF |
3262 | } |
3263 | ||
2b3909f8 DW |
3264 | res = btrfs_extent_same(src, loff, olen, dst, dst_loff); |
3265 | if (res) | |
3266 | return res; | |
3267 | return olen; | |
416161db MF |
3268 | } |
3269 | ||
f82a9901 FM |
3270 | static int clone_finish_inode_update(struct btrfs_trans_handle *trans, |
3271 | struct inode *inode, | |
3272 | u64 endoff, | |
3273 | const u64 destoff, | |
1c919a5e MF |
3274 | const u64 olen, |
3275 | int no_time_update) | |
f82a9901 FM |
3276 | { |
3277 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3278 | int ret; | |
3279 | ||
3280 | inode_inc_iversion(inode); | |
1c919a5e | 3281 | if (!no_time_update) |
04b285f3 | 3282 | inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb); |
f82a9901 FM |
3283 | /* |
3284 | * We round up to the block size at eof when determining which | |
3285 | * extents to clone above, but shouldn't round up the file size. | |
3286 | */ | |
3287 | if (endoff > destoff + olen) | |
3288 | endoff = destoff + olen; | |
3289 | if (endoff > inode->i_size) | |
3290 | btrfs_i_size_write(inode, endoff); | |
3291 | ||
3292 | ret = btrfs_update_inode(trans, root, inode); | |
3293 | if (ret) { | |
66642832 | 3294 | btrfs_abort_transaction(trans, ret); |
f82a9901 FM |
3295 | btrfs_end_transaction(trans, root); |
3296 | goto out; | |
3297 | } | |
3298 | ret = btrfs_end_transaction(trans, root); | |
3299 | out: | |
3300 | return ret; | |
3301 | } | |
3302 | ||
7ffbb598 FM |
3303 | static void clone_update_extent_map(struct inode *inode, |
3304 | const struct btrfs_trans_handle *trans, | |
3305 | const struct btrfs_path *path, | |
7ffbb598 FM |
3306 | const u64 hole_offset, |
3307 | const u64 hole_len) | |
3308 | { | |
3309 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
3310 | struct extent_map *em; | |
3311 | int ret; | |
3312 | ||
3313 | em = alloc_extent_map(); | |
3314 | if (!em) { | |
3315 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
3316 | &BTRFS_I(inode)->runtime_flags); | |
3317 | return; | |
3318 | } | |
3319 | ||
14f59796 FM |
3320 | if (path) { |
3321 | struct btrfs_file_extent_item *fi; | |
3322 | ||
3323 | fi = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3324 | struct btrfs_file_extent_item); | |
7ffbb598 FM |
3325 | btrfs_extent_item_to_extent_map(inode, path, fi, false, em); |
3326 | em->generation = -1; | |
3327 | if (btrfs_file_extent_type(path->nodes[0], fi) == | |
3328 | BTRFS_FILE_EXTENT_INLINE) | |
3329 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
3330 | &BTRFS_I(inode)->runtime_flags); | |
3331 | } else { | |
3332 | em->start = hole_offset; | |
3333 | em->len = hole_len; | |
3334 | em->ram_bytes = em->len; | |
3335 | em->orig_start = hole_offset; | |
3336 | em->block_start = EXTENT_MAP_HOLE; | |
3337 | em->block_len = 0; | |
3338 | em->orig_block_len = 0; | |
3339 | em->compress_type = BTRFS_COMPRESS_NONE; | |
3340 | em->generation = trans->transid; | |
3341 | } | |
3342 | ||
3343 | while (1) { | |
3344 | write_lock(&em_tree->lock); | |
3345 | ret = add_extent_mapping(em_tree, em, 1); | |
3346 | write_unlock(&em_tree->lock); | |
3347 | if (ret != -EEXIST) { | |
3348 | free_extent_map(em); | |
3349 | break; | |
3350 | } | |
3351 | btrfs_drop_extent_cache(inode, em->start, | |
3352 | em->start + em->len - 1, 0); | |
3353 | } | |
3354 | ||
ee39b432 | 3355 | if (ret) |
7ffbb598 FM |
3356 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
3357 | &BTRFS_I(inode)->runtime_flags); | |
3358 | } | |
3359 | ||
8039d87d FM |
3360 | /* |
3361 | * Make sure we do not end up inserting an inline extent into a file that has | |
3362 | * already other (non-inline) extents. If a file has an inline extent it can | |
3363 | * not have any other extents and the (single) inline extent must start at the | |
3364 | * file offset 0. Failing to respect these rules will lead to file corruption, | |
3365 | * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc | |
3366 | * | |
3367 | * We can have extents that have been already written to disk or we can have | |
3368 | * dirty ranges still in delalloc, in which case the extent maps and items are | |
3369 | * created only when we run delalloc, and the delalloc ranges might fall outside | |
3370 | * the range we are currently locking in the inode's io tree. So we check the | |
3371 | * inode's i_size because of that (i_size updates are done while holding the | |
3372 | * i_mutex, which we are holding here). | |
3373 | * We also check to see if the inode has a size not greater than "datal" but has | |
3374 | * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are | |
3375 | * protected against such concurrent fallocate calls by the i_mutex). | |
3376 | * | |
3377 | * If the file has no extents but a size greater than datal, do not allow the | |
3378 | * copy because we would need turn the inline extent into a non-inline one (even | |
3379 | * with NO_HOLES enabled). If we find our destination inode only has one inline | |
3380 | * extent, just overwrite it with the source inline extent if its size is less | |
3381 | * than the source extent's size, or we could copy the source inline extent's | |
3382 | * data into the destination inode's inline extent if the later is greater then | |
3383 | * the former. | |
3384 | */ | |
3385 | static int clone_copy_inline_extent(struct inode *src, | |
3386 | struct inode *dst, | |
3387 | struct btrfs_trans_handle *trans, | |
3388 | struct btrfs_path *path, | |
3389 | struct btrfs_key *new_key, | |
3390 | const u64 drop_start, | |
3391 | const u64 datal, | |
3392 | const u64 skip, | |
3393 | const u64 size, | |
3394 | char *inline_data) | |
3395 | { | |
3396 | struct btrfs_root *root = BTRFS_I(dst)->root; | |
3397 | const u64 aligned_end = ALIGN(new_key->offset + datal, | |
3398 | root->sectorsize); | |
3399 | int ret; | |
3400 | struct btrfs_key key; | |
3401 | ||
3402 | if (new_key->offset > 0) | |
3403 | return -EOPNOTSUPP; | |
3404 | ||
3405 | key.objectid = btrfs_ino(dst); | |
3406 | key.type = BTRFS_EXTENT_DATA_KEY; | |
3407 | key.offset = 0; | |
3408 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3409 | if (ret < 0) { | |
3410 | return ret; | |
3411 | } else if (ret > 0) { | |
3412 | if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) { | |
3413 | ret = btrfs_next_leaf(root, path); | |
3414 | if (ret < 0) | |
3415 | return ret; | |
3416 | else if (ret > 0) | |
3417 | goto copy_inline_extent; | |
3418 | } | |
3419 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
3420 | if (key.objectid == btrfs_ino(dst) && | |
3421 | key.type == BTRFS_EXTENT_DATA_KEY) { | |
3422 | ASSERT(key.offset > 0); | |
3423 | return -EOPNOTSUPP; | |
3424 | } | |
3425 | } else if (i_size_read(dst) <= datal) { | |
3426 | struct btrfs_file_extent_item *ei; | |
3427 | u64 ext_len; | |
3428 | ||
3429 | /* | |
3430 | * If the file size is <= datal, make sure there are no other | |
3431 | * extents following (can happen do to an fallocate call with | |
3432 | * the flag FALLOC_FL_KEEP_SIZE). | |
3433 | */ | |
3434 | ei = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3435 | struct btrfs_file_extent_item); | |
3436 | /* | |
3437 | * If it's an inline extent, it can not have other extents | |
3438 | * following it. | |
3439 | */ | |
3440 | if (btrfs_file_extent_type(path->nodes[0], ei) == | |
3441 | BTRFS_FILE_EXTENT_INLINE) | |
3442 | goto copy_inline_extent; | |
3443 | ||
3444 | ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei); | |
3445 | if (ext_len > aligned_end) | |
3446 | return -EOPNOTSUPP; | |
3447 | ||
3448 | ret = btrfs_next_item(root, path); | |
3449 | if (ret < 0) { | |
3450 | return ret; | |
3451 | } else if (ret == 0) { | |
3452 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
3453 | path->slots[0]); | |
3454 | if (key.objectid == btrfs_ino(dst) && | |
3455 | key.type == BTRFS_EXTENT_DATA_KEY) | |
3456 | return -EOPNOTSUPP; | |
3457 | } | |
3458 | } | |
3459 | ||
3460 | copy_inline_extent: | |
3461 | /* | |
3462 | * We have no extent items, or we have an extent at offset 0 which may | |
3463 | * or may not be inlined. All these cases are dealt the same way. | |
3464 | */ | |
3465 | if (i_size_read(dst) > datal) { | |
3466 | /* | |
3467 | * If the destination inode has an inline extent... | |
3468 | * This would require copying the data from the source inline | |
3469 | * extent into the beginning of the destination's inline extent. | |
3470 | * But this is really complex, both extents can be compressed | |
3471 | * or just one of them, which would require decompressing and | |
3472 | * re-compressing data (which could increase the new compressed | |
3473 | * size, not allowing the compressed data to fit anymore in an | |
3474 | * inline extent). | |
3475 | * So just don't support this case for now (it should be rare, | |
3476 | * we are not really saving space when cloning inline extents). | |
3477 | */ | |
3478 | return -EOPNOTSUPP; | |
3479 | } | |
3480 | ||
3481 | btrfs_release_path(path); | |
3482 | ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1); | |
3483 | if (ret) | |
3484 | return ret; | |
3485 | ret = btrfs_insert_empty_item(trans, root, path, new_key, size); | |
3486 | if (ret) | |
3487 | return ret; | |
3488 | ||
3489 | if (skip) { | |
3490 | const u32 start = btrfs_file_extent_calc_inline_size(0); | |
3491 | ||
3492 | memmove(inline_data + start, inline_data + start + skip, datal); | |
3493 | } | |
3494 | ||
3495 | write_extent_buffer(path->nodes[0], inline_data, | |
3496 | btrfs_item_ptr_offset(path->nodes[0], | |
3497 | path->slots[0]), | |
3498 | size); | |
3499 | inode_add_bytes(dst, datal); | |
3500 | ||
3501 | return 0; | |
3502 | } | |
3503 | ||
32b7c687 MF |
3504 | /** |
3505 | * btrfs_clone() - clone a range from inode file to another | |
3506 | * | |
3507 | * @src: Inode to clone from | |
3508 | * @inode: Inode to clone to | |
3509 | * @off: Offset within source to start clone from | |
3510 | * @olen: Original length, passed by user, of range to clone | |
1c919a5e | 3511 | * @olen_aligned: Block-aligned value of olen |
32b7c687 | 3512 | * @destoff: Offset within @inode to start clone |
1c919a5e | 3513 | * @no_time_update: Whether to update mtime/ctime on the target inode |
32b7c687 MF |
3514 | */ |
3515 | static int btrfs_clone(struct inode *src, struct inode *inode, | |
f82a9901 | 3516 | const u64 off, const u64 olen, const u64 olen_aligned, |
1c919a5e | 3517 | const u64 destoff, int no_time_update) |
f46b5a66 | 3518 | { |
f46b5a66 | 3519 | struct btrfs_root *root = BTRFS_I(inode)->root; |
32b7c687 | 3520 | struct btrfs_path *path = NULL; |
f46b5a66 | 3521 | struct extent_buffer *leaf; |
32b7c687 MF |
3522 | struct btrfs_trans_handle *trans; |
3523 | char *buf = NULL; | |
ae01a0ab | 3524 | struct btrfs_key key; |
f46b5a66 CH |
3525 | u32 nritems; |
3526 | int slot; | |
ae01a0ab | 3527 | int ret; |
f82a9901 | 3528 | const u64 len = olen_aligned; |
f82a9901 | 3529 | u64 last_dest_end = destoff; |
ae01a0ab YZ |
3530 | |
3531 | ret = -ENOMEM; | |
15351955 DS |
3532 | buf = kmalloc(root->nodesize, GFP_KERNEL | __GFP_NOWARN); |
3533 | if (!buf) { | |
3534 | buf = vmalloc(root->nodesize); | |
3535 | if (!buf) | |
3536 | return ret; | |
3537 | } | |
ae01a0ab YZ |
3538 | |
3539 | path = btrfs_alloc_path(); | |
3540 | if (!path) { | |
15351955 | 3541 | kvfree(buf); |
32b7c687 | 3542 | return ret; |
d525e8ab LZ |
3543 | } |
3544 | ||
e4058b54 | 3545 | path->reada = READA_FORWARD; |
c5c9cd4d | 3546 | /* clone data */ |
33345d01 | 3547 | key.objectid = btrfs_ino(src); |
ae01a0ab | 3548 | key.type = BTRFS_EXTENT_DATA_KEY; |
2c463823 | 3549 | key.offset = off; |
f46b5a66 CH |
3550 | |
3551 | while (1) { | |
de249e66 | 3552 | u64 next_key_min_offset = key.offset + 1; |
df858e76 | 3553 | |
f46b5a66 CH |
3554 | /* |
3555 | * note the key will change type as we walk through the | |
3556 | * tree. | |
3557 | */ | |
e4355f34 | 3558 | path->leave_spinning = 1; |
362a20c5 DS |
3559 | ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, |
3560 | 0, 0); | |
f46b5a66 CH |
3561 | if (ret < 0) |
3562 | goto out; | |
2c463823 FM |
3563 | /* |
3564 | * First search, if no extent item that starts at offset off was | |
3565 | * found but the previous item is an extent item, it's possible | |
3566 | * it might overlap our target range, therefore process it. | |
3567 | */ | |
3568 | if (key.offset == off && ret > 0 && path->slots[0] > 0) { | |
3569 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
3570 | path->slots[0] - 1); | |
3571 | if (key.type == BTRFS_EXTENT_DATA_KEY) | |
3572 | path->slots[0]--; | |
3573 | } | |
f46b5a66 | 3574 | |
ae01a0ab | 3575 | nritems = btrfs_header_nritems(path->nodes[0]); |
e4355f34 | 3576 | process_slot: |
ae01a0ab | 3577 | if (path->slots[0] >= nritems) { |
362a20c5 | 3578 | ret = btrfs_next_leaf(BTRFS_I(src)->root, path); |
f46b5a66 CH |
3579 | if (ret < 0) |
3580 | goto out; | |
3581 | if (ret > 0) | |
3582 | break; | |
ae01a0ab | 3583 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
3584 | } |
3585 | leaf = path->nodes[0]; | |
3586 | slot = path->slots[0]; | |
f46b5a66 | 3587 | |
ae01a0ab | 3588 | btrfs_item_key_to_cpu(leaf, &key, slot); |
962a298f | 3589 | if (key.type > BTRFS_EXTENT_DATA_KEY || |
33345d01 | 3590 | key.objectid != btrfs_ino(src)) |
f46b5a66 CH |
3591 | break; |
3592 | ||
962a298f | 3593 | if (key.type == BTRFS_EXTENT_DATA_KEY) { |
c5c9cd4d SW |
3594 | struct btrfs_file_extent_item *extent; |
3595 | int type; | |
31840ae1 ZY |
3596 | u32 size; |
3597 | struct btrfs_key new_key; | |
c5c9cd4d SW |
3598 | u64 disko = 0, diskl = 0; |
3599 | u64 datao = 0, datal = 0; | |
3600 | u8 comp; | |
f82a9901 | 3601 | u64 drop_start; |
31840ae1 | 3602 | |
c5c9cd4d SW |
3603 | extent = btrfs_item_ptr(leaf, slot, |
3604 | struct btrfs_file_extent_item); | |
3605 | comp = btrfs_file_extent_compression(leaf, extent); | |
3606 | type = btrfs_file_extent_type(leaf, extent); | |
c8a894d7 CM |
3607 | if (type == BTRFS_FILE_EXTENT_REG || |
3608 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d397712b CM |
3609 | disko = btrfs_file_extent_disk_bytenr(leaf, |
3610 | extent); | |
3611 | diskl = btrfs_file_extent_disk_num_bytes(leaf, | |
3612 | extent); | |
c5c9cd4d | 3613 | datao = btrfs_file_extent_offset(leaf, extent); |
d397712b CM |
3614 | datal = btrfs_file_extent_num_bytes(leaf, |
3615 | extent); | |
c5c9cd4d SW |
3616 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
3617 | /* take upper bound, may be compressed */ | |
3618 | datal = btrfs_file_extent_ram_bytes(leaf, | |
3619 | extent); | |
3620 | } | |
31840ae1 | 3621 | |
2c463823 FM |
3622 | /* |
3623 | * The first search might have left us at an extent | |
3624 | * item that ends before our target range's start, can | |
3625 | * happen if we have holes and NO_HOLES feature enabled. | |
3626 | */ | |
3627 | if (key.offset + datal <= off) { | |
e4355f34 FDBM |
3628 | path->slots[0]++; |
3629 | goto process_slot; | |
2c463823 FM |
3630 | } else if (key.offset >= off + len) { |
3631 | break; | |
e4355f34 | 3632 | } |
df858e76 | 3633 | next_key_min_offset = key.offset + datal; |
e4355f34 FDBM |
3634 | size = btrfs_item_size_nr(leaf, slot); |
3635 | read_extent_buffer(leaf, buf, | |
3636 | btrfs_item_ptr_offset(leaf, slot), | |
3637 | size); | |
3638 | ||
3639 | btrfs_release_path(path); | |
3640 | path->leave_spinning = 0; | |
c5c9cd4d | 3641 | |
31840ae1 | 3642 | memcpy(&new_key, &key, sizeof(new_key)); |
33345d01 | 3643 | new_key.objectid = btrfs_ino(inode); |
4d728ec7 LZ |
3644 | if (off <= key.offset) |
3645 | new_key.offset = key.offset + destoff - off; | |
3646 | else | |
3647 | new_key.offset = destoff; | |
31840ae1 | 3648 | |
f82a9901 FM |
3649 | /* |
3650 | * Deal with a hole that doesn't have an extent item | |
3651 | * that represents it (NO_HOLES feature enabled). | |
3652 | * This hole is either in the middle of the cloning | |
3653 | * range or at the beginning (fully overlaps it or | |
3654 | * partially overlaps it). | |
3655 | */ | |
3656 | if (new_key.offset != last_dest_end) | |
3657 | drop_start = last_dest_end; | |
3658 | else | |
3659 | drop_start = new_key.offset; | |
3660 | ||
b6f3409b SW |
3661 | /* |
3662 | * 1 - adjusting old extent (we may have to split it) | |
3663 | * 1 - add new extent | |
3664 | * 1 - inode update | |
3665 | */ | |
3666 | trans = btrfs_start_transaction(root, 3); | |
a22285a6 YZ |
3667 | if (IS_ERR(trans)) { |
3668 | ret = PTR_ERR(trans); | |
3669 | goto out; | |
3670 | } | |
3671 | ||
c8a894d7 CM |
3672 | if (type == BTRFS_FILE_EXTENT_REG || |
3673 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d72c0842 LZ |
3674 | /* |
3675 | * a | --- range to clone ---| b | |
3676 | * | ------------- extent ------------- | | |
3677 | */ | |
3678 | ||
93915584 | 3679 | /* subtract range b */ |
d72c0842 LZ |
3680 | if (key.offset + datal > off + len) |
3681 | datal = off + len - key.offset; | |
3682 | ||
93915584 | 3683 | /* subtract range a */ |
a22285a6 YZ |
3684 | if (off > key.offset) { |
3685 | datao += off - key.offset; | |
3686 | datal -= off - key.offset; | |
3687 | } | |
3688 | ||
5dc562c5 | 3689 | ret = btrfs_drop_extents(trans, root, inode, |
f82a9901 | 3690 | drop_start, |
a22285a6 | 3691 | new_key.offset + datal, |
2671485d | 3692 | 1); |
79787eaa | 3693 | if (ret) { |
3f9e3df8 | 3694 | if (ret != -EOPNOTSUPP) |
00fdf13a | 3695 | btrfs_abort_transaction(trans, |
66642832 | 3696 | ret); |
79787eaa JM |
3697 | btrfs_end_transaction(trans, root); |
3698 | goto out; | |
3699 | } | |
a22285a6 | 3700 | |
c5c9cd4d SW |
3701 | ret = btrfs_insert_empty_item(trans, root, path, |
3702 | &new_key, size); | |
79787eaa | 3703 | if (ret) { |
66642832 | 3704 | btrfs_abort_transaction(trans, ret); |
79787eaa JM |
3705 | btrfs_end_transaction(trans, root); |
3706 | goto out; | |
3707 | } | |
c5c9cd4d SW |
3708 | |
3709 | leaf = path->nodes[0]; | |
3710 | slot = path->slots[0]; | |
3711 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
3712 | btrfs_item_ptr_offset(leaf, slot), |
3713 | size); | |
ae01a0ab | 3714 | |
c5c9cd4d | 3715 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 3716 | struct btrfs_file_extent_item); |
c5c9cd4d | 3717 | |
c5c9cd4d SW |
3718 | /* disko == 0 means it's a hole */ |
3719 | if (!disko) | |
3720 | datao = 0; | |
c5c9cd4d SW |
3721 | |
3722 | btrfs_set_file_extent_offset(leaf, extent, | |
3723 | datao); | |
3724 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
3725 | datal); | |
fcebe456 | 3726 | |
c5c9cd4d SW |
3727 | if (disko) { |
3728 | inode_add_bytes(inode, datal); | |
ae01a0ab | 3729 | ret = btrfs_inc_extent_ref(trans, root, |
5d4f98a2 YZ |
3730 | disko, diskl, 0, |
3731 | root->root_key.objectid, | |
33345d01 | 3732 | btrfs_ino(inode), |
b06c4bf5 | 3733 | new_key.offset - datao); |
79787eaa JM |
3734 | if (ret) { |
3735 | btrfs_abort_transaction(trans, | |
79787eaa JM |
3736 | ret); |
3737 | btrfs_end_transaction(trans, | |
3738 | root); | |
3739 | goto out; | |
3740 | ||
3741 | } | |
f46b5a66 | 3742 | } |
c5c9cd4d SW |
3743 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
3744 | u64 skip = 0; | |
3745 | u64 trim = 0; | |
ed958762 | 3746 | |
c5c9cd4d SW |
3747 | if (off > key.offset) { |
3748 | skip = off - key.offset; | |
3749 | new_key.offset += skip; | |
3750 | } | |
d397712b | 3751 | |
aa42ffd9 LB |
3752 | if (key.offset + datal > off + len) |
3753 | trim = key.offset + datal - (off + len); | |
d397712b | 3754 | |
c5c9cd4d | 3755 | if (comp && (skip || trim)) { |
c5c9cd4d | 3756 | ret = -EINVAL; |
a22285a6 | 3757 | btrfs_end_transaction(trans, root); |
c5c9cd4d SW |
3758 | goto out; |
3759 | } | |
3760 | size -= skip + trim; | |
3761 | datal -= skip + trim; | |
a22285a6 | 3762 | |
8039d87d FM |
3763 | ret = clone_copy_inline_extent(src, inode, |
3764 | trans, path, | |
3765 | &new_key, | |
3766 | drop_start, | |
3767 | datal, | |
3768 | skip, size, buf); | |
79787eaa | 3769 | if (ret) { |
3f9e3df8 | 3770 | if (ret != -EOPNOTSUPP) |
3a29bc09 | 3771 | btrfs_abort_transaction(trans, |
8039d87d | 3772 | ret); |
79787eaa JM |
3773 | btrfs_end_transaction(trans, root); |
3774 | goto out; | |
3775 | } | |
c5c9cd4d SW |
3776 | leaf = path->nodes[0]; |
3777 | slot = path->slots[0]; | |
f46b5a66 | 3778 | } |
c5c9cd4d | 3779 | |
7ffbb598 FM |
3780 | /* If we have an implicit hole (NO_HOLES feature). */ |
3781 | if (drop_start < new_key.offset) | |
3782 | clone_update_extent_map(inode, trans, | |
14f59796 | 3783 | NULL, drop_start, |
7ffbb598 FM |
3784 | new_key.offset - drop_start); |
3785 | ||
14f59796 | 3786 | clone_update_extent_map(inode, trans, path, 0, 0); |
7ffbb598 | 3787 | |
c5c9cd4d | 3788 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 3789 | btrfs_release_path(path); |
c5c9cd4d | 3790 | |
62e2390e FM |
3791 | last_dest_end = ALIGN(new_key.offset + datal, |
3792 | root->sectorsize); | |
f82a9901 FM |
3793 | ret = clone_finish_inode_update(trans, inode, |
3794 | last_dest_end, | |
1c919a5e MF |
3795 | destoff, olen, |
3796 | no_time_update); | |
f82a9901 | 3797 | if (ret) |
79787eaa | 3798 | goto out; |
2c463823 FM |
3799 | if (new_key.offset + datal >= destoff + len) |
3800 | break; | |
a22285a6 | 3801 | } |
b3b4aa74 | 3802 | btrfs_release_path(path); |
df858e76 | 3803 | key.offset = next_key_min_offset; |
f46b5a66 | 3804 | } |
f46b5a66 | 3805 | ret = 0; |
32b7c687 | 3806 | |
f82a9901 FM |
3807 | if (last_dest_end < destoff + len) { |
3808 | /* | |
3809 | * We have an implicit hole (NO_HOLES feature is enabled) that | |
3810 | * fully or partially overlaps our cloning range at its end. | |
3811 | */ | |
3812 | btrfs_release_path(path); | |
3813 | ||
3814 | /* | |
3815 | * 1 - remove extent(s) | |
3816 | * 1 - inode update | |
3817 | */ | |
3818 | trans = btrfs_start_transaction(root, 2); | |
3819 | if (IS_ERR(trans)) { | |
3820 | ret = PTR_ERR(trans); | |
3821 | goto out; | |
3822 | } | |
3823 | ret = btrfs_drop_extents(trans, root, inode, | |
3824 | last_dest_end, destoff + len, 1); | |
3825 | if (ret) { | |
3826 | if (ret != -EOPNOTSUPP) | |
66642832 | 3827 | btrfs_abort_transaction(trans, ret); |
f82a9901 FM |
3828 | btrfs_end_transaction(trans, root); |
3829 | goto out; | |
3830 | } | |
14f59796 FM |
3831 | clone_update_extent_map(inode, trans, NULL, last_dest_end, |
3832 | destoff + len - last_dest_end); | |
f82a9901 | 3833 | ret = clone_finish_inode_update(trans, inode, destoff + len, |
1c919a5e | 3834 | destoff, olen, no_time_update); |
f82a9901 FM |
3835 | } |
3836 | ||
f46b5a66 | 3837 | out: |
32b7c687 | 3838 | btrfs_free_path(path); |
15351955 | 3839 | kvfree(buf); |
32b7c687 MF |
3840 | return ret; |
3841 | } | |
3842 | ||
3db11b2e ZB |
3843 | static noinline int btrfs_clone_files(struct file *file, struct file *file_src, |
3844 | u64 off, u64 olen, u64 destoff) | |
32b7c687 | 3845 | { |
54563d41 | 3846 | struct inode *inode = file_inode(file); |
3db11b2e | 3847 | struct inode *src = file_inode(file_src); |
32b7c687 | 3848 | struct btrfs_root *root = BTRFS_I(inode)->root; |
32b7c687 MF |
3849 | int ret; |
3850 | u64 len = olen; | |
3851 | u64 bs = root->fs_info->sb->s_blocksize; | |
3db11b2e | 3852 | int same_inode = src == inode; |
32b7c687 MF |
3853 | |
3854 | /* | |
3855 | * TODO: | |
3856 | * - split compressed inline extents. annoying: we need to | |
3857 | * decompress into destination's address_space (the file offset | |
3858 | * may change, so source mapping won't do), then recompress (or | |
3859 | * otherwise reinsert) a subrange. | |
00fdf13a LB |
3860 | * |
3861 | * - split destination inode's inline extents. The inline extents can | |
3862 | * be either compressed or non-compressed. | |
32b7c687 MF |
3863 | */ |
3864 | ||
32b7c687 MF |
3865 | if (btrfs_root_readonly(root)) |
3866 | return -EROFS; | |
3867 | ||
3db11b2e ZB |
3868 | if (file_src->f_path.mnt != file->f_path.mnt || |
3869 | src->i_sb != inode->i_sb) | |
3870 | return -EXDEV; | |
32b7c687 MF |
3871 | |
3872 | /* don't make the dst file partly checksummed */ | |
3873 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != | |
3874 | (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) | |
3db11b2e | 3875 | return -EINVAL; |
32b7c687 | 3876 | |
32b7c687 | 3877 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) |
3db11b2e | 3878 | return -EISDIR; |
32b7c687 MF |
3879 | |
3880 | if (!same_inode) { | |
293a8489 | 3881 | btrfs_double_inode_lock(src, inode); |
32b7c687 | 3882 | } else { |
5955102c | 3883 | inode_lock(src); |
32b7c687 MF |
3884 | } |
3885 | ||
3886 | /* determine range to clone */ | |
3887 | ret = -EINVAL; | |
3888 | if (off + len > src->i_size || off + len < off) | |
3889 | goto out_unlock; | |
3890 | if (len == 0) | |
3891 | olen = len = src->i_size - off; | |
3892 | /* if we extend to eof, continue to block boundary */ | |
3893 | if (off + len == src->i_size) | |
3894 | len = ALIGN(src->i_size, bs) - off; | |
3895 | ||
ccccf3d6 FM |
3896 | if (len == 0) { |
3897 | ret = 0; | |
3898 | goto out_unlock; | |
3899 | } | |
3900 | ||
32b7c687 MF |
3901 | /* verify the end result is block aligned */ |
3902 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || | |
3903 | !IS_ALIGNED(destoff, bs)) | |
3904 | goto out_unlock; | |
3905 | ||
3906 | /* verify if ranges are overlapped within the same file */ | |
3907 | if (same_inode) { | |
3908 | if (destoff + len > off && destoff < off + len) | |
3909 | goto out_unlock; | |
3910 | } | |
3911 | ||
3912 | if (destoff > inode->i_size) { | |
3913 | ret = btrfs_cont_expand(inode, inode->i_size, destoff); | |
3914 | if (ret) | |
3915 | goto out_unlock; | |
3916 | } | |
3917 | ||
c125b8bf FM |
3918 | /* |
3919 | * Lock the target range too. Right after we replace the file extent | |
3920 | * items in the fs tree (which now point to the cloned data), we might | |
3921 | * have a worker replace them with extent items relative to a write | |
3922 | * operation that was issued before this clone operation (i.e. confront | |
3923 | * with inode.c:btrfs_finish_ordered_io). | |
3924 | */ | |
3925 | if (same_inode) { | |
3926 | u64 lock_start = min_t(u64, off, destoff); | |
3927 | u64 lock_len = max_t(u64, off, destoff) + len - lock_start; | |
32b7c687 | 3928 | |
e0bd70c6 | 3929 | ret = lock_extent_range(src, lock_start, lock_len, true); |
c125b8bf | 3930 | } else { |
e0bd70c6 FM |
3931 | ret = btrfs_double_extent_lock(src, off, inode, destoff, len, |
3932 | true); | |
3933 | } | |
3934 | ASSERT(ret == 0); | |
3935 | if (WARN_ON(ret)) { | |
3936 | /* ranges in the io trees already unlocked */ | |
3937 | goto out_unlock; | |
c125b8bf | 3938 | } |
32b7c687 | 3939 | |
1c919a5e | 3940 | ret = btrfs_clone(src, inode, off, olen, len, destoff, 0); |
32b7c687 | 3941 | |
c125b8bf FM |
3942 | if (same_inode) { |
3943 | u64 lock_start = min_t(u64, off, destoff); | |
3944 | u64 lock_end = max_t(u64, off, destoff) + len - 1; | |
3945 | ||
3946 | unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end); | |
3947 | } else { | |
293a8489 | 3948 | btrfs_double_extent_unlock(src, off, inode, destoff, len); |
c125b8bf FM |
3949 | } |
3950 | /* | |
3951 | * Truncate page cache pages so that future reads will see the cloned | |
3952 | * data immediately and not the previous data. | |
3953 | */ | |
65bfa658 | 3954 | truncate_inode_pages_range(&inode->i_data, |
09cbfeaf KS |
3955 | round_down(destoff, PAGE_SIZE), |
3956 | round_up(destoff + len, PAGE_SIZE) - 1); | |
f46b5a66 | 3957 | out_unlock: |
293a8489 MF |
3958 | if (!same_inode) |
3959 | btrfs_double_inode_unlock(src, inode); | |
3960 | else | |
5955102c | 3961 | inode_unlock(src); |
3db11b2e ZB |
3962 | return ret; |
3963 | } | |
3964 | ||
3965 | ssize_t btrfs_copy_file_range(struct file *file_in, loff_t pos_in, | |
3966 | struct file *file_out, loff_t pos_out, | |
3967 | size_t len, unsigned int flags) | |
3968 | { | |
3969 | ssize_t ret; | |
3970 | ||
3971 | ret = btrfs_clone_files(file_out, file_in, pos_in, len, pos_out); | |
3972 | if (ret == 0) | |
3973 | ret = len; | |
3974 | return ret; | |
3975 | } | |
3976 | ||
04b38d60 CH |
3977 | int btrfs_clone_file_range(struct file *src_file, loff_t off, |
3978 | struct file *dst_file, loff_t destoff, u64 len) | |
3db11b2e | 3979 | { |
04b38d60 | 3980 | return btrfs_clone_files(dst_file, src_file, off, len, destoff); |
c5c9cd4d SW |
3981 | } |
3982 | ||
f46b5a66 CH |
3983 | /* |
3984 | * there are many ways the trans_start and trans_end ioctls can lead | |
3985 | * to deadlocks. They should only be used by applications that | |
3986 | * basically own the machine, and have a very in depth understanding | |
3987 | * of all the possible deadlocks and enospc problems. | |
3988 | */ | |
b2950863 | 3989 | static long btrfs_ioctl_trans_start(struct file *file) |
f46b5a66 | 3990 | { |
496ad9aa | 3991 | struct inode *inode = file_inode(file); |
f46b5a66 CH |
3992 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3993 | struct btrfs_trans_handle *trans; | |
1ab86aed | 3994 | int ret; |
f46b5a66 | 3995 | |
1ab86aed | 3996 | ret = -EPERM; |
df5b5520 | 3997 | if (!capable(CAP_SYS_ADMIN)) |
1ab86aed | 3998 | goto out; |
df5b5520 | 3999 | |
1ab86aed SW |
4000 | ret = -EINPROGRESS; |
4001 | if (file->private_data) | |
f46b5a66 | 4002 | goto out; |
9ca9ee09 | 4003 | |
b83cc969 LZ |
4004 | ret = -EROFS; |
4005 | if (btrfs_root_readonly(root)) | |
4006 | goto out; | |
4007 | ||
a561be71 | 4008 | ret = mnt_want_write_file(file); |
c146afad YZ |
4009 | if (ret) |
4010 | goto out; | |
4011 | ||
a4abeea4 | 4012 | atomic_inc(&root->fs_info->open_ioctl_trans); |
9ca9ee09 | 4013 | |
1ab86aed | 4014 | ret = -ENOMEM; |
7a7eaa40 | 4015 | trans = btrfs_start_ioctl_transaction(root); |
abd30bb0 | 4016 | if (IS_ERR(trans)) |
1ab86aed SW |
4017 | goto out_drop; |
4018 | ||
4019 | file->private_data = trans; | |
4020 | return 0; | |
4021 | ||
4022 | out_drop: | |
a4abeea4 | 4023 | atomic_dec(&root->fs_info->open_ioctl_trans); |
2a79f17e | 4024 | mnt_drop_write_file(file); |
f46b5a66 | 4025 | out: |
f46b5a66 CH |
4026 | return ret; |
4027 | } | |
4028 | ||
6ef5ed0d JB |
4029 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
4030 | { | |
496ad9aa | 4031 | struct inode *inode = file_inode(file); |
6ef5ed0d JB |
4032 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4033 | struct btrfs_root *new_root; | |
4034 | struct btrfs_dir_item *di; | |
4035 | struct btrfs_trans_handle *trans; | |
4036 | struct btrfs_path *path; | |
4037 | struct btrfs_key location; | |
4038 | struct btrfs_disk_key disk_key; | |
6ef5ed0d JB |
4039 | u64 objectid = 0; |
4040 | u64 dir_id; | |
3c04ce01 | 4041 | int ret; |
6ef5ed0d JB |
4042 | |
4043 | if (!capable(CAP_SYS_ADMIN)) | |
4044 | return -EPERM; | |
4045 | ||
3c04ce01 MX |
4046 | ret = mnt_want_write_file(file); |
4047 | if (ret) | |
4048 | return ret; | |
4049 | ||
4050 | if (copy_from_user(&objectid, argp, sizeof(objectid))) { | |
4051 | ret = -EFAULT; | |
4052 | goto out; | |
4053 | } | |
6ef5ed0d JB |
4054 | |
4055 | if (!objectid) | |
1cecf579 | 4056 | objectid = BTRFS_FS_TREE_OBJECTID; |
6ef5ed0d JB |
4057 | |
4058 | location.objectid = objectid; | |
4059 | location.type = BTRFS_ROOT_ITEM_KEY; | |
4060 | location.offset = (u64)-1; | |
4061 | ||
4062 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
3c04ce01 MX |
4063 | if (IS_ERR(new_root)) { |
4064 | ret = PTR_ERR(new_root); | |
4065 | goto out; | |
4066 | } | |
6ef5ed0d | 4067 | |
6ef5ed0d | 4068 | path = btrfs_alloc_path(); |
3c04ce01 MX |
4069 | if (!path) { |
4070 | ret = -ENOMEM; | |
4071 | goto out; | |
4072 | } | |
6ef5ed0d JB |
4073 | path->leave_spinning = 1; |
4074 | ||
4075 | trans = btrfs_start_transaction(root, 1); | |
98d5dc13 | 4076 | if (IS_ERR(trans)) { |
6ef5ed0d | 4077 | btrfs_free_path(path); |
3c04ce01 MX |
4078 | ret = PTR_ERR(trans); |
4079 | goto out; | |
6ef5ed0d JB |
4080 | } |
4081 | ||
6c41761f | 4082 | dir_id = btrfs_super_root_dir(root->fs_info->super_copy); |
6ef5ed0d JB |
4083 | di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, |
4084 | dir_id, "default", 7, 1); | |
cf1e99a4 | 4085 | if (IS_ERR_OR_NULL(di)) { |
6ef5ed0d JB |
4086 | btrfs_free_path(path); |
4087 | btrfs_end_transaction(trans, root); | |
efe120a0 FH |
4088 | btrfs_err(new_root->fs_info, "Umm, you don't have the default dir" |
4089 | "item, this isn't going to work"); | |
3c04ce01 MX |
4090 | ret = -ENOENT; |
4091 | goto out; | |
6ef5ed0d JB |
4092 | } |
4093 | ||
4094 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); | |
4095 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); | |
4096 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
4097 | btrfs_free_path(path); | |
4098 | ||
2b0ce2c2 | 4099 | btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); |
6ef5ed0d | 4100 | btrfs_end_transaction(trans, root); |
3c04ce01 MX |
4101 | out: |
4102 | mnt_drop_write_file(file); | |
4103 | return ret; | |
6ef5ed0d JB |
4104 | } |
4105 | ||
5af3e8cc SB |
4106 | void btrfs_get_block_group_info(struct list_head *groups_list, |
4107 | struct btrfs_ioctl_space_info *space) | |
bf5fc093 JB |
4108 | { |
4109 | struct btrfs_block_group_cache *block_group; | |
4110 | ||
4111 | space->total_bytes = 0; | |
4112 | space->used_bytes = 0; | |
4113 | space->flags = 0; | |
4114 | list_for_each_entry(block_group, groups_list, list) { | |
4115 | space->flags = block_group->flags; | |
4116 | space->total_bytes += block_group->key.offset; | |
4117 | space->used_bytes += | |
4118 | btrfs_block_group_used(&block_group->item); | |
4119 | } | |
4120 | } | |
4121 | ||
48a3b636 | 4122 | static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) |
1406e432 JB |
4123 | { |
4124 | struct btrfs_ioctl_space_args space_args; | |
4125 | struct btrfs_ioctl_space_info space; | |
4126 | struct btrfs_ioctl_space_info *dest; | |
7fde62bf | 4127 | struct btrfs_ioctl_space_info *dest_orig; |
13f2696f | 4128 | struct btrfs_ioctl_space_info __user *user_dest; |
1406e432 | 4129 | struct btrfs_space_info *info; |
bf5fc093 JB |
4130 | u64 types[] = {BTRFS_BLOCK_GROUP_DATA, |
4131 | BTRFS_BLOCK_GROUP_SYSTEM, | |
4132 | BTRFS_BLOCK_GROUP_METADATA, | |
4133 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; | |
4134 | int num_types = 4; | |
7fde62bf | 4135 | int alloc_size; |
1406e432 | 4136 | int ret = 0; |
51788b1b | 4137 | u64 slot_count = 0; |
bf5fc093 | 4138 | int i, c; |
1406e432 JB |
4139 | |
4140 | if (copy_from_user(&space_args, | |
4141 | (struct btrfs_ioctl_space_args __user *)arg, | |
4142 | sizeof(space_args))) | |
4143 | return -EFAULT; | |
4144 | ||
bf5fc093 JB |
4145 | for (i = 0; i < num_types; i++) { |
4146 | struct btrfs_space_info *tmp; | |
4147 | ||
4148 | info = NULL; | |
4149 | rcu_read_lock(); | |
4150 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
4151 | list) { | |
4152 | if (tmp->flags == types[i]) { | |
4153 | info = tmp; | |
4154 | break; | |
4155 | } | |
4156 | } | |
4157 | rcu_read_unlock(); | |
4158 | ||
4159 | if (!info) | |
4160 | continue; | |
4161 | ||
4162 | down_read(&info->groups_sem); | |
4163 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
4164 | if (!list_empty(&info->block_groups[c])) | |
4165 | slot_count++; | |
4166 | } | |
4167 | up_read(&info->groups_sem); | |
4168 | } | |
7fde62bf | 4169 | |
36523e95 DS |
4170 | /* |
4171 | * Global block reserve, exported as a space_info | |
4172 | */ | |
4173 | slot_count++; | |
4174 | ||
7fde62bf CM |
4175 | /* space_slots == 0 means they are asking for a count */ |
4176 | if (space_args.space_slots == 0) { | |
4177 | space_args.total_spaces = slot_count; | |
4178 | goto out; | |
4179 | } | |
bf5fc093 | 4180 | |
51788b1b | 4181 | slot_count = min_t(u64, space_args.space_slots, slot_count); |
bf5fc093 | 4182 | |
7fde62bf | 4183 | alloc_size = sizeof(*dest) * slot_count; |
bf5fc093 | 4184 | |
7fde62bf CM |
4185 | /* we generally have at most 6 or so space infos, one for each raid |
4186 | * level. So, a whole page should be more than enough for everyone | |
4187 | */ | |
09cbfeaf | 4188 | if (alloc_size > PAGE_SIZE) |
7fde62bf CM |
4189 | return -ENOMEM; |
4190 | ||
1406e432 | 4191 | space_args.total_spaces = 0; |
8d2db785 | 4192 | dest = kmalloc(alloc_size, GFP_KERNEL); |
7fde62bf CM |
4193 | if (!dest) |
4194 | return -ENOMEM; | |
4195 | dest_orig = dest; | |
1406e432 | 4196 | |
7fde62bf | 4197 | /* now we have a buffer to copy into */ |
bf5fc093 JB |
4198 | for (i = 0; i < num_types; i++) { |
4199 | struct btrfs_space_info *tmp; | |
4200 | ||
51788b1b DR |
4201 | if (!slot_count) |
4202 | break; | |
4203 | ||
bf5fc093 JB |
4204 | info = NULL; |
4205 | rcu_read_lock(); | |
4206 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
4207 | list) { | |
4208 | if (tmp->flags == types[i]) { | |
4209 | info = tmp; | |
4210 | break; | |
4211 | } | |
4212 | } | |
4213 | rcu_read_unlock(); | |
7fde62bf | 4214 | |
bf5fc093 JB |
4215 | if (!info) |
4216 | continue; | |
4217 | down_read(&info->groups_sem); | |
4218 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
4219 | if (!list_empty(&info->block_groups[c])) { | |
5af3e8cc SB |
4220 | btrfs_get_block_group_info( |
4221 | &info->block_groups[c], &space); | |
bf5fc093 JB |
4222 | memcpy(dest, &space, sizeof(space)); |
4223 | dest++; | |
4224 | space_args.total_spaces++; | |
51788b1b | 4225 | slot_count--; |
bf5fc093 | 4226 | } |
51788b1b DR |
4227 | if (!slot_count) |
4228 | break; | |
bf5fc093 JB |
4229 | } |
4230 | up_read(&info->groups_sem); | |
1406e432 | 4231 | } |
1406e432 | 4232 | |
36523e95 DS |
4233 | /* |
4234 | * Add global block reserve | |
4235 | */ | |
4236 | if (slot_count) { | |
4237 | struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv; | |
4238 | ||
4239 | spin_lock(&block_rsv->lock); | |
4240 | space.total_bytes = block_rsv->size; | |
4241 | space.used_bytes = block_rsv->size - block_rsv->reserved; | |
4242 | spin_unlock(&block_rsv->lock); | |
4243 | space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; | |
4244 | memcpy(dest, &space, sizeof(space)); | |
4245 | space_args.total_spaces++; | |
4246 | } | |
4247 | ||
2eec6c81 | 4248 | user_dest = (struct btrfs_ioctl_space_info __user *) |
7fde62bf CM |
4249 | (arg + sizeof(struct btrfs_ioctl_space_args)); |
4250 | ||
4251 | if (copy_to_user(user_dest, dest_orig, alloc_size)) | |
4252 | ret = -EFAULT; | |
4253 | ||
4254 | kfree(dest_orig); | |
4255 | out: | |
4256 | if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) | |
1406e432 JB |
4257 | ret = -EFAULT; |
4258 | ||
4259 | return ret; | |
4260 | } | |
4261 | ||
f46b5a66 CH |
4262 | /* |
4263 | * there are many ways the trans_start and trans_end ioctls can lead | |
4264 | * to deadlocks. They should only be used by applications that | |
4265 | * basically own the machine, and have a very in depth understanding | |
4266 | * of all the possible deadlocks and enospc problems. | |
4267 | */ | |
4268 | long btrfs_ioctl_trans_end(struct file *file) | |
4269 | { | |
496ad9aa | 4270 | struct inode *inode = file_inode(file); |
f46b5a66 CH |
4271 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4272 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 4273 | |
f46b5a66 | 4274 | trans = file->private_data; |
1ab86aed SW |
4275 | if (!trans) |
4276 | return -EINVAL; | |
b214107e | 4277 | file->private_data = NULL; |
9ca9ee09 | 4278 | |
1ab86aed SW |
4279 | btrfs_end_transaction(trans, root); |
4280 | ||
a4abeea4 | 4281 | atomic_dec(&root->fs_info->open_ioctl_trans); |
9ca9ee09 | 4282 | |
2a79f17e | 4283 | mnt_drop_write_file(file); |
1ab86aed | 4284 | return 0; |
f46b5a66 CH |
4285 | } |
4286 | ||
9a8c28be MX |
4287 | static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, |
4288 | void __user *argp) | |
46204592 | 4289 | { |
46204592 SW |
4290 | struct btrfs_trans_handle *trans; |
4291 | u64 transid; | |
db5b493a | 4292 | int ret; |
46204592 | 4293 | |
d4edf39b | 4294 | trans = btrfs_attach_transaction_barrier(root); |
ff7c1d33 MX |
4295 | if (IS_ERR(trans)) { |
4296 | if (PTR_ERR(trans) != -ENOENT) | |
4297 | return PTR_ERR(trans); | |
4298 | ||
4299 | /* No running transaction, don't bother */ | |
4300 | transid = root->fs_info->last_trans_committed; | |
4301 | goto out; | |
4302 | } | |
46204592 | 4303 | transid = trans->transid; |
db5b493a | 4304 | ret = btrfs_commit_transaction_async(trans, root, 0); |
8b2b2d3c TI |
4305 | if (ret) { |
4306 | btrfs_end_transaction(trans, root); | |
db5b493a | 4307 | return ret; |
8b2b2d3c | 4308 | } |
ff7c1d33 | 4309 | out: |
46204592 SW |
4310 | if (argp) |
4311 | if (copy_to_user(argp, &transid, sizeof(transid))) | |
4312 | return -EFAULT; | |
4313 | return 0; | |
4314 | } | |
4315 | ||
9a8c28be MX |
4316 | static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, |
4317 | void __user *argp) | |
46204592 | 4318 | { |
46204592 SW |
4319 | u64 transid; |
4320 | ||
4321 | if (argp) { | |
4322 | if (copy_from_user(&transid, argp, sizeof(transid))) | |
4323 | return -EFAULT; | |
4324 | } else { | |
4325 | transid = 0; /* current trans */ | |
4326 | } | |
4327 | return btrfs_wait_for_commit(root, transid); | |
4328 | } | |
4329 | ||
b8e95489 | 4330 | static long btrfs_ioctl_scrub(struct file *file, void __user *arg) |
475f6387 | 4331 | { |
496ad9aa | 4332 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
475f6387 | 4333 | struct btrfs_ioctl_scrub_args *sa; |
b8e95489 | 4334 | int ret; |
475f6387 JS |
4335 | |
4336 | if (!capable(CAP_SYS_ADMIN)) | |
4337 | return -EPERM; | |
4338 | ||
4339 | sa = memdup_user(arg, sizeof(*sa)); | |
4340 | if (IS_ERR(sa)) | |
4341 | return PTR_ERR(sa); | |
4342 | ||
b8e95489 MX |
4343 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) { |
4344 | ret = mnt_want_write_file(file); | |
4345 | if (ret) | |
4346 | goto out; | |
4347 | } | |
4348 | ||
aa1b8cd4 | 4349 | ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, |
63a212ab SB |
4350 | &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, |
4351 | 0); | |
475f6387 JS |
4352 | |
4353 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
4354 | ret = -EFAULT; | |
4355 | ||
b8e95489 MX |
4356 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) |
4357 | mnt_drop_write_file(file); | |
4358 | out: | |
475f6387 JS |
4359 | kfree(sa); |
4360 | return ret; | |
4361 | } | |
4362 | ||
4363 | static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) | |
4364 | { | |
4365 | if (!capable(CAP_SYS_ADMIN)) | |
4366 | return -EPERM; | |
4367 | ||
aa1b8cd4 | 4368 | return btrfs_scrub_cancel(root->fs_info); |
475f6387 JS |
4369 | } |
4370 | ||
4371 | static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, | |
4372 | void __user *arg) | |
4373 | { | |
4374 | struct btrfs_ioctl_scrub_args *sa; | |
4375 | int ret; | |
4376 | ||
4377 | if (!capable(CAP_SYS_ADMIN)) | |
4378 | return -EPERM; | |
4379 | ||
4380 | sa = memdup_user(arg, sizeof(*sa)); | |
4381 | if (IS_ERR(sa)) | |
4382 | return PTR_ERR(sa); | |
4383 | ||
4384 | ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); | |
4385 | ||
4386 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
4387 | ret = -EFAULT; | |
4388 | ||
4389 | kfree(sa); | |
4390 | return ret; | |
4391 | } | |
4392 | ||
c11d2c23 | 4393 | static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, |
b27f7c0c | 4394 | void __user *arg) |
c11d2c23 SB |
4395 | { |
4396 | struct btrfs_ioctl_get_dev_stats *sa; | |
4397 | int ret; | |
4398 | ||
c11d2c23 SB |
4399 | sa = memdup_user(arg, sizeof(*sa)); |
4400 | if (IS_ERR(sa)) | |
4401 | return PTR_ERR(sa); | |
4402 | ||
b27f7c0c DS |
4403 | if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { |
4404 | kfree(sa); | |
4405 | return -EPERM; | |
4406 | } | |
4407 | ||
4408 | ret = btrfs_get_dev_stats(root, sa); | |
c11d2c23 SB |
4409 | |
4410 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
4411 | ret = -EFAULT; | |
4412 | ||
4413 | kfree(sa); | |
4414 | return ret; | |
4415 | } | |
4416 | ||
3f6bcfbd SB |
4417 | static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) |
4418 | { | |
4419 | struct btrfs_ioctl_dev_replace_args *p; | |
4420 | int ret; | |
4421 | ||
4422 | if (!capable(CAP_SYS_ADMIN)) | |
4423 | return -EPERM; | |
4424 | ||
4425 | p = memdup_user(arg, sizeof(*p)); | |
4426 | if (IS_ERR(p)) | |
4427 | return PTR_ERR(p); | |
4428 | ||
4429 | switch (p->cmd) { | |
4430 | case BTRFS_IOCTL_DEV_REPLACE_CMD_START: | |
adfa97cb ID |
4431 | if (root->fs_info->sb->s_flags & MS_RDONLY) { |
4432 | ret = -EROFS; | |
4433 | goto out; | |
4434 | } | |
3f6bcfbd SB |
4435 | if (atomic_xchg( |
4436 | &root->fs_info->mutually_exclusive_operation_running, | |
4437 | 1)) { | |
e57138b3 | 4438 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
3f6bcfbd | 4439 | } else { |
b5255456 | 4440 | ret = btrfs_dev_replace_by_ioctl(root, p); |
3f6bcfbd SB |
4441 | atomic_set( |
4442 | &root->fs_info->mutually_exclusive_operation_running, | |
4443 | 0); | |
4444 | } | |
4445 | break; | |
4446 | case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: | |
4447 | btrfs_dev_replace_status(root->fs_info, p); | |
4448 | ret = 0; | |
4449 | break; | |
4450 | case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: | |
4451 | ret = btrfs_dev_replace_cancel(root->fs_info, p); | |
4452 | break; | |
4453 | default: | |
4454 | ret = -EINVAL; | |
4455 | break; | |
4456 | } | |
4457 | ||
4458 | if (copy_to_user(arg, p, sizeof(*p))) | |
4459 | ret = -EFAULT; | |
adfa97cb | 4460 | out: |
3f6bcfbd SB |
4461 | kfree(p); |
4462 | return ret; | |
4463 | } | |
4464 | ||
d7728c96 JS |
4465 | static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) |
4466 | { | |
4467 | int ret = 0; | |
4468 | int i; | |
740c3d22 | 4469 | u64 rel_ptr; |
d7728c96 | 4470 | int size; |
806468f8 | 4471 | struct btrfs_ioctl_ino_path_args *ipa = NULL; |
d7728c96 JS |
4472 | struct inode_fs_paths *ipath = NULL; |
4473 | struct btrfs_path *path; | |
4474 | ||
82b22ac8 | 4475 | if (!capable(CAP_DAC_READ_SEARCH)) |
d7728c96 JS |
4476 | return -EPERM; |
4477 | ||
4478 | path = btrfs_alloc_path(); | |
4479 | if (!path) { | |
4480 | ret = -ENOMEM; | |
4481 | goto out; | |
4482 | } | |
4483 | ||
4484 | ipa = memdup_user(arg, sizeof(*ipa)); | |
4485 | if (IS_ERR(ipa)) { | |
4486 | ret = PTR_ERR(ipa); | |
4487 | ipa = NULL; | |
4488 | goto out; | |
4489 | } | |
4490 | ||
4491 | size = min_t(u32, ipa->size, 4096); | |
4492 | ipath = init_ipath(size, root, path); | |
4493 | if (IS_ERR(ipath)) { | |
4494 | ret = PTR_ERR(ipath); | |
4495 | ipath = NULL; | |
4496 | goto out; | |
4497 | } | |
4498 | ||
4499 | ret = paths_from_inode(ipa->inum, ipath); | |
4500 | if (ret < 0) | |
4501 | goto out; | |
4502 | ||
4503 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) { | |
745c4d8e JM |
4504 | rel_ptr = ipath->fspath->val[i] - |
4505 | (u64)(unsigned long)ipath->fspath->val; | |
740c3d22 | 4506 | ipath->fspath->val[i] = rel_ptr; |
d7728c96 JS |
4507 | } |
4508 | ||
745c4d8e JM |
4509 | ret = copy_to_user((void *)(unsigned long)ipa->fspath, |
4510 | (void *)(unsigned long)ipath->fspath, size); | |
d7728c96 JS |
4511 | if (ret) { |
4512 | ret = -EFAULT; | |
4513 | goto out; | |
4514 | } | |
4515 | ||
4516 | out: | |
4517 | btrfs_free_path(path); | |
4518 | free_ipath(ipath); | |
4519 | kfree(ipa); | |
4520 | ||
4521 | return ret; | |
4522 | } | |
4523 | ||
4524 | static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) | |
4525 | { | |
4526 | struct btrfs_data_container *inodes = ctx; | |
4527 | const size_t c = 3 * sizeof(u64); | |
4528 | ||
4529 | if (inodes->bytes_left >= c) { | |
4530 | inodes->bytes_left -= c; | |
4531 | inodes->val[inodes->elem_cnt] = inum; | |
4532 | inodes->val[inodes->elem_cnt + 1] = offset; | |
4533 | inodes->val[inodes->elem_cnt + 2] = root; | |
4534 | inodes->elem_cnt += 3; | |
4535 | } else { | |
4536 | inodes->bytes_missing += c - inodes->bytes_left; | |
4537 | inodes->bytes_left = 0; | |
4538 | inodes->elem_missed += 3; | |
4539 | } | |
4540 | ||
4541 | return 0; | |
4542 | } | |
4543 | ||
4544 | static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, | |
4545 | void __user *arg) | |
4546 | { | |
4547 | int ret = 0; | |
4548 | int size; | |
d7728c96 JS |
4549 | struct btrfs_ioctl_logical_ino_args *loi; |
4550 | struct btrfs_data_container *inodes = NULL; | |
4551 | struct btrfs_path *path = NULL; | |
d7728c96 JS |
4552 | |
4553 | if (!capable(CAP_SYS_ADMIN)) | |
4554 | return -EPERM; | |
4555 | ||
4556 | loi = memdup_user(arg, sizeof(*loi)); | |
4557 | if (IS_ERR(loi)) { | |
4558 | ret = PTR_ERR(loi); | |
4559 | loi = NULL; | |
4560 | goto out; | |
4561 | } | |
4562 | ||
4563 | path = btrfs_alloc_path(); | |
4564 | if (!path) { | |
4565 | ret = -ENOMEM; | |
4566 | goto out; | |
4567 | } | |
4568 | ||
ee22184b | 4569 | size = min_t(u32, loi->size, SZ_64K); |
d7728c96 JS |
4570 | inodes = init_data_container(size); |
4571 | if (IS_ERR(inodes)) { | |
4572 | ret = PTR_ERR(inodes); | |
4573 | inodes = NULL; | |
4574 | goto out; | |
4575 | } | |
4576 | ||
df031f07 LB |
4577 | ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, |
4578 | build_ino_list, inodes); | |
4579 | if (ret == -EINVAL) | |
d7728c96 JS |
4580 | ret = -ENOENT; |
4581 | if (ret < 0) | |
4582 | goto out; | |
4583 | ||
745c4d8e JM |
4584 | ret = copy_to_user((void *)(unsigned long)loi->inodes, |
4585 | (void *)(unsigned long)inodes, size); | |
d7728c96 JS |
4586 | if (ret) |
4587 | ret = -EFAULT; | |
4588 | ||
4589 | out: | |
4590 | btrfs_free_path(path); | |
425d17a2 | 4591 | vfree(inodes); |
d7728c96 JS |
4592 | kfree(loi); |
4593 | ||
4594 | return ret; | |
4595 | } | |
4596 | ||
19a39dce | 4597 | void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, |
c9e9f97b ID |
4598 | struct btrfs_ioctl_balance_args *bargs) |
4599 | { | |
4600 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
4601 | ||
4602 | bargs->flags = bctl->flags; | |
4603 | ||
837d5b6e ID |
4604 | if (atomic_read(&fs_info->balance_running)) |
4605 | bargs->state |= BTRFS_BALANCE_STATE_RUNNING; | |
4606 | if (atomic_read(&fs_info->balance_pause_req)) | |
4607 | bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; | |
a7e99c69 ID |
4608 | if (atomic_read(&fs_info->balance_cancel_req)) |
4609 | bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; | |
837d5b6e | 4610 | |
c9e9f97b ID |
4611 | memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); |
4612 | memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); | |
4613 | memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); | |
19a39dce ID |
4614 | |
4615 | if (lock) { | |
4616 | spin_lock(&fs_info->balance_lock); | |
4617 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
4618 | spin_unlock(&fs_info->balance_lock); | |
4619 | } else { | |
4620 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
4621 | } | |
c9e9f97b ID |
4622 | } |
4623 | ||
9ba1f6e4 | 4624 | static long btrfs_ioctl_balance(struct file *file, void __user *arg) |
c9e9f97b | 4625 | { |
496ad9aa | 4626 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
c9e9f97b ID |
4627 | struct btrfs_fs_info *fs_info = root->fs_info; |
4628 | struct btrfs_ioctl_balance_args *bargs; | |
4629 | struct btrfs_balance_control *bctl; | |
ed0fb78f | 4630 | bool need_unlock; /* for mut. excl. ops lock */ |
c9e9f97b ID |
4631 | int ret; |
4632 | ||
4633 | if (!capable(CAP_SYS_ADMIN)) | |
4634 | return -EPERM; | |
4635 | ||
e54bfa31 | 4636 | ret = mnt_want_write_file(file); |
9ba1f6e4 LB |
4637 | if (ret) |
4638 | return ret; | |
4639 | ||
ed0fb78f ID |
4640 | again: |
4641 | if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { | |
4642 | mutex_lock(&fs_info->volume_mutex); | |
4643 | mutex_lock(&fs_info->balance_mutex); | |
4644 | need_unlock = true; | |
4645 | goto locked; | |
4646 | } | |
4647 | ||
4648 | /* | |
01327610 | 4649 | * mut. excl. ops lock is locked. Three possibilities: |
ed0fb78f ID |
4650 | * (1) some other op is running |
4651 | * (2) balance is running | |
4652 | * (3) balance is paused -- special case (think resume) | |
4653 | */ | |
c9e9f97b | 4654 | mutex_lock(&fs_info->balance_mutex); |
ed0fb78f ID |
4655 | if (fs_info->balance_ctl) { |
4656 | /* this is either (2) or (3) */ | |
4657 | if (!atomic_read(&fs_info->balance_running)) { | |
4658 | mutex_unlock(&fs_info->balance_mutex); | |
4659 | if (!mutex_trylock(&fs_info->volume_mutex)) | |
4660 | goto again; | |
4661 | mutex_lock(&fs_info->balance_mutex); | |
4662 | ||
4663 | if (fs_info->balance_ctl && | |
4664 | !atomic_read(&fs_info->balance_running)) { | |
4665 | /* this is (3) */ | |
4666 | need_unlock = false; | |
4667 | goto locked; | |
4668 | } | |
4669 | ||
4670 | mutex_unlock(&fs_info->balance_mutex); | |
4671 | mutex_unlock(&fs_info->volume_mutex); | |
4672 | goto again; | |
4673 | } else { | |
4674 | /* this is (2) */ | |
4675 | mutex_unlock(&fs_info->balance_mutex); | |
4676 | ret = -EINPROGRESS; | |
4677 | goto out; | |
4678 | } | |
4679 | } else { | |
4680 | /* this is (1) */ | |
4681 | mutex_unlock(&fs_info->balance_mutex); | |
e57138b3 | 4682 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
ed0fb78f ID |
4683 | goto out; |
4684 | } | |
4685 | ||
4686 | locked: | |
4687 | BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); | |
c9e9f97b ID |
4688 | |
4689 | if (arg) { | |
4690 | bargs = memdup_user(arg, sizeof(*bargs)); | |
4691 | if (IS_ERR(bargs)) { | |
4692 | ret = PTR_ERR(bargs); | |
ed0fb78f | 4693 | goto out_unlock; |
c9e9f97b | 4694 | } |
de322263 ID |
4695 | |
4696 | if (bargs->flags & BTRFS_BALANCE_RESUME) { | |
4697 | if (!fs_info->balance_ctl) { | |
4698 | ret = -ENOTCONN; | |
4699 | goto out_bargs; | |
4700 | } | |
4701 | ||
4702 | bctl = fs_info->balance_ctl; | |
4703 | spin_lock(&fs_info->balance_lock); | |
4704 | bctl->flags |= BTRFS_BALANCE_RESUME; | |
4705 | spin_unlock(&fs_info->balance_lock); | |
4706 | ||
4707 | goto do_balance; | |
4708 | } | |
c9e9f97b ID |
4709 | } else { |
4710 | bargs = NULL; | |
4711 | } | |
4712 | ||
ed0fb78f | 4713 | if (fs_info->balance_ctl) { |
837d5b6e ID |
4714 | ret = -EINPROGRESS; |
4715 | goto out_bargs; | |
4716 | } | |
4717 | ||
8d2db785 | 4718 | bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); |
c9e9f97b ID |
4719 | if (!bctl) { |
4720 | ret = -ENOMEM; | |
4721 | goto out_bargs; | |
4722 | } | |
4723 | ||
4724 | bctl->fs_info = fs_info; | |
4725 | if (arg) { | |
4726 | memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); | |
4727 | memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); | |
4728 | memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); | |
4729 | ||
4730 | bctl->flags = bargs->flags; | |
f43ffb60 ID |
4731 | } else { |
4732 | /* balance everything - no filters */ | |
4733 | bctl->flags |= BTRFS_BALANCE_TYPE_MASK; | |
c9e9f97b ID |
4734 | } |
4735 | ||
8eb93459 DS |
4736 | if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { |
4737 | ret = -EINVAL; | |
0f89abf5 | 4738 | goto out_bctl; |
8eb93459 DS |
4739 | } |
4740 | ||
de322263 | 4741 | do_balance: |
c9e9f97b | 4742 | /* |
ed0fb78f ID |
4743 | * Ownership of bctl and mutually_exclusive_operation_running |
4744 | * goes to to btrfs_balance. bctl is freed in __cancel_balance, | |
4745 | * or, if restriper was paused all the way until unmount, in | |
4746 | * free_fs_info. mutually_exclusive_operation_running is | |
4747 | * cleared in __cancel_balance. | |
c9e9f97b | 4748 | */ |
ed0fb78f ID |
4749 | need_unlock = false; |
4750 | ||
4751 | ret = btrfs_balance(bctl, bargs); | |
0f89abf5 | 4752 | bctl = NULL; |
ed0fb78f | 4753 | |
c9e9f97b ID |
4754 | if (arg) { |
4755 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
4756 | ret = -EFAULT; | |
4757 | } | |
4758 | ||
0f89abf5 CE |
4759 | out_bctl: |
4760 | kfree(bctl); | |
c9e9f97b ID |
4761 | out_bargs: |
4762 | kfree(bargs); | |
ed0fb78f | 4763 | out_unlock: |
c9e9f97b ID |
4764 | mutex_unlock(&fs_info->balance_mutex); |
4765 | mutex_unlock(&fs_info->volume_mutex); | |
ed0fb78f ID |
4766 | if (need_unlock) |
4767 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); | |
4768 | out: | |
e54bfa31 | 4769 | mnt_drop_write_file(file); |
c9e9f97b ID |
4770 | return ret; |
4771 | } | |
4772 | ||
837d5b6e ID |
4773 | static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) |
4774 | { | |
4775 | if (!capable(CAP_SYS_ADMIN)) | |
4776 | return -EPERM; | |
4777 | ||
4778 | switch (cmd) { | |
4779 | case BTRFS_BALANCE_CTL_PAUSE: | |
4780 | return btrfs_pause_balance(root->fs_info); | |
a7e99c69 ID |
4781 | case BTRFS_BALANCE_CTL_CANCEL: |
4782 | return btrfs_cancel_balance(root->fs_info); | |
837d5b6e ID |
4783 | } |
4784 | ||
4785 | return -EINVAL; | |
4786 | } | |
4787 | ||
19a39dce ID |
4788 | static long btrfs_ioctl_balance_progress(struct btrfs_root *root, |
4789 | void __user *arg) | |
4790 | { | |
4791 | struct btrfs_fs_info *fs_info = root->fs_info; | |
4792 | struct btrfs_ioctl_balance_args *bargs; | |
4793 | int ret = 0; | |
4794 | ||
4795 | if (!capable(CAP_SYS_ADMIN)) | |
4796 | return -EPERM; | |
4797 | ||
4798 | mutex_lock(&fs_info->balance_mutex); | |
4799 | if (!fs_info->balance_ctl) { | |
4800 | ret = -ENOTCONN; | |
4801 | goto out; | |
4802 | } | |
4803 | ||
8d2db785 | 4804 | bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); |
19a39dce ID |
4805 | if (!bargs) { |
4806 | ret = -ENOMEM; | |
4807 | goto out; | |
4808 | } | |
4809 | ||
4810 | update_ioctl_balance_args(fs_info, 1, bargs); | |
4811 | ||
4812 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
4813 | ret = -EFAULT; | |
4814 | ||
4815 | kfree(bargs); | |
4816 | out: | |
4817 | mutex_unlock(&fs_info->balance_mutex); | |
4818 | return ret; | |
4819 | } | |
4820 | ||
905b0dda | 4821 | static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) |
5d13a37b | 4822 | { |
496ad9aa | 4823 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4824 | struct btrfs_ioctl_quota_ctl_args *sa; |
4825 | struct btrfs_trans_handle *trans = NULL; | |
4826 | int ret; | |
4827 | int err; | |
4828 | ||
4829 | if (!capable(CAP_SYS_ADMIN)) | |
4830 | return -EPERM; | |
4831 | ||
905b0dda MX |
4832 | ret = mnt_want_write_file(file); |
4833 | if (ret) | |
4834 | return ret; | |
5d13a37b AJ |
4835 | |
4836 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4837 | if (IS_ERR(sa)) { |
4838 | ret = PTR_ERR(sa); | |
4839 | goto drop_write; | |
4840 | } | |
5d13a37b | 4841 | |
7708f029 | 4842 | down_write(&root->fs_info->subvol_sem); |
2f232036 JS |
4843 | trans = btrfs_start_transaction(root->fs_info->tree_root, 2); |
4844 | if (IS_ERR(trans)) { | |
4845 | ret = PTR_ERR(trans); | |
4846 | goto out; | |
5d13a37b AJ |
4847 | } |
4848 | ||
4849 | switch (sa->cmd) { | |
4850 | case BTRFS_QUOTA_CTL_ENABLE: | |
4851 | ret = btrfs_quota_enable(trans, root->fs_info); | |
4852 | break; | |
4853 | case BTRFS_QUOTA_CTL_DISABLE: | |
4854 | ret = btrfs_quota_disable(trans, root->fs_info); | |
4855 | break; | |
5d13a37b AJ |
4856 | default: |
4857 | ret = -EINVAL; | |
4858 | break; | |
4859 | } | |
4860 | ||
2f232036 JS |
4861 | err = btrfs_commit_transaction(trans, root->fs_info->tree_root); |
4862 | if (err && !ret) | |
4863 | ret = err; | |
5d13a37b AJ |
4864 | out: |
4865 | kfree(sa); | |
7708f029 | 4866 | up_write(&root->fs_info->subvol_sem); |
905b0dda MX |
4867 | drop_write: |
4868 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4869 | return ret; |
4870 | } | |
4871 | ||
905b0dda | 4872 | static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) |
5d13a37b | 4873 | { |
496ad9aa | 4874 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4875 | struct btrfs_ioctl_qgroup_assign_args *sa; |
4876 | struct btrfs_trans_handle *trans; | |
4877 | int ret; | |
4878 | int err; | |
4879 | ||
4880 | if (!capable(CAP_SYS_ADMIN)) | |
4881 | return -EPERM; | |
4882 | ||
905b0dda MX |
4883 | ret = mnt_want_write_file(file); |
4884 | if (ret) | |
4885 | return ret; | |
5d13a37b AJ |
4886 | |
4887 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4888 | if (IS_ERR(sa)) { |
4889 | ret = PTR_ERR(sa); | |
4890 | goto drop_write; | |
4891 | } | |
5d13a37b AJ |
4892 | |
4893 | trans = btrfs_join_transaction(root); | |
4894 | if (IS_ERR(trans)) { | |
4895 | ret = PTR_ERR(trans); | |
4896 | goto out; | |
4897 | } | |
4898 | ||
4899 | /* FIXME: check if the IDs really exist */ | |
4900 | if (sa->assign) { | |
4901 | ret = btrfs_add_qgroup_relation(trans, root->fs_info, | |
4902 | sa->src, sa->dst); | |
4903 | } else { | |
4904 | ret = btrfs_del_qgroup_relation(trans, root->fs_info, | |
4905 | sa->src, sa->dst); | |
4906 | } | |
4907 | ||
e082f563 QW |
4908 | /* update qgroup status and info */ |
4909 | err = btrfs_run_qgroups(trans, root->fs_info); | |
4910 | if (err < 0) | |
ad8403df AJ |
4911 | btrfs_handle_fs_error(root->fs_info, err, |
4912 | "failed to update qgroup status and info"); | |
5d13a37b AJ |
4913 | err = btrfs_end_transaction(trans, root); |
4914 | if (err && !ret) | |
4915 | ret = err; | |
4916 | ||
4917 | out: | |
4918 | kfree(sa); | |
905b0dda MX |
4919 | drop_write: |
4920 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4921 | return ret; |
4922 | } | |
4923 | ||
905b0dda | 4924 | static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) |
5d13a37b | 4925 | { |
496ad9aa | 4926 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4927 | struct btrfs_ioctl_qgroup_create_args *sa; |
4928 | struct btrfs_trans_handle *trans; | |
4929 | int ret; | |
4930 | int err; | |
4931 | ||
4932 | if (!capable(CAP_SYS_ADMIN)) | |
4933 | return -EPERM; | |
4934 | ||
905b0dda MX |
4935 | ret = mnt_want_write_file(file); |
4936 | if (ret) | |
4937 | return ret; | |
5d13a37b AJ |
4938 | |
4939 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4940 | if (IS_ERR(sa)) { |
4941 | ret = PTR_ERR(sa); | |
4942 | goto drop_write; | |
4943 | } | |
5d13a37b | 4944 | |
d86e56cf MX |
4945 | if (!sa->qgroupid) { |
4946 | ret = -EINVAL; | |
4947 | goto out; | |
4948 | } | |
4949 | ||
5d13a37b AJ |
4950 | trans = btrfs_join_transaction(root); |
4951 | if (IS_ERR(trans)) { | |
4952 | ret = PTR_ERR(trans); | |
4953 | goto out; | |
4954 | } | |
4955 | ||
4956 | /* FIXME: check if the IDs really exist */ | |
4957 | if (sa->create) { | |
4087cf24 | 4958 | ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid); |
5d13a37b AJ |
4959 | } else { |
4960 | ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); | |
4961 | } | |
4962 | ||
4963 | err = btrfs_end_transaction(trans, root); | |
4964 | if (err && !ret) | |
4965 | ret = err; | |
4966 | ||
4967 | out: | |
4968 | kfree(sa); | |
905b0dda MX |
4969 | drop_write: |
4970 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4971 | return ret; |
4972 | } | |
4973 | ||
905b0dda | 4974 | static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) |
5d13a37b | 4975 | { |
496ad9aa | 4976 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4977 | struct btrfs_ioctl_qgroup_limit_args *sa; |
4978 | struct btrfs_trans_handle *trans; | |
4979 | int ret; | |
4980 | int err; | |
4981 | u64 qgroupid; | |
4982 | ||
4983 | if (!capable(CAP_SYS_ADMIN)) | |
4984 | return -EPERM; | |
4985 | ||
905b0dda MX |
4986 | ret = mnt_want_write_file(file); |
4987 | if (ret) | |
4988 | return ret; | |
5d13a37b AJ |
4989 | |
4990 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4991 | if (IS_ERR(sa)) { |
4992 | ret = PTR_ERR(sa); | |
4993 | goto drop_write; | |
4994 | } | |
5d13a37b AJ |
4995 | |
4996 | trans = btrfs_join_transaction(root); | |
4997 | if (IS_ERR(trans)) { | |
4998 | ret = PTR_ERR(trans); | |
4999 | goto out; | |
5000 | } | |
5001 | ||
5002 | qgroupid = sa->qgroupid; | |
5003 | if (!qgroupid) { | |
5004 | /* take the current subvol as qgroup */ | |
5005 | qgroupid = root->root_key.objectid; | |
5006 | } | |
5007 | ||
5008 | /* FIXME: check if the IDs really exist */ | |
5009 | ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); | |
5010 | ||
5011 | err = btrfs_end_transaction(trans, root); | |
5012 | if (err && !ret) | |
5013 | ret = err; | |
5014 | ||
5015 | out: | |
5016 | kfree(sa); | |
905b0dda MX |
5017 | drop_write: |
5018 | mnt_drop_write_file(file); | |
5d13a37b AJ |
5019 | return ret; |
5020 | } | |
5021 | ||
2f232036 JS |
5022 | static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) |
5023 | { | |
6d0379ec | 5024 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
2f232036 JS |
5025 | struct btrfs_ioctl_quota_rescan_args *qsa; |
5026 | int ret; | |
5027 | ||
5028 | if (!capable(CAP_SYS_ADMIN)) | |
5029 | return -EPERM; | |
5030 | ||
5031 | ret = mnt_want_write_file(file); | |
5032 | if (ret) | |
5033 | return ret; | |
5034 | ||
5035 | qsa = memdup_user(arg, sizeof(*qsa)); | |
5036 | if (IS_ERR(qsa)) { | |
5037 | ret = PTR_ERR(qsa); | |
5038 | goto drop_write; | |
5039 | } | |
5040 | ||
5041 | if (qsa->flags) { | |
5042 | ret = -EINVAL; | |
5043 | goto out; | |
5044 | } | |
5045 | ||
5046 | ret = btrfs_qgroup_rescan(root->fs_info); | |
5047 | ||
5048 | out: | |
5049 | kfree(qsa); | |
5050 | drop_write: | |
5051 | mnt_drop_write_file(file); | |
5052 | return ret; | |
5053 | } | |
5054 | ||
5055 | static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) | |
5056 | { | |
6d0379ec | 5057 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
2f232036 JS |
5058 | struct btrfs_ioctl_quota_rescan_args *qsa; |
5059 | int ret = 0; | |
5060 | ||
5061 | if (!capable(CAP_SYS_ADMIN)) | |
5062 | return -EPERM; | |
5063 | ||
8d2db785 | 5064 | qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); |
2f232036 JS |
5065 | if (!qsa) |
5066 | return -ENOMEM; | |
5067 | ||
5068 | if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { | |
5069 | qsa->flags = 1; | |
5070 | qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; | |
5071 | } | |
5072 | ||
5073 | if (copy_to_user(arg, qsa, sizeof(*qsa))) | |
5074 | ret = -EFAULT; | |
5075 | ||
5076 | kfree(qsa); | |
5077 | return ret; | |
5078 | } | |
5079 | ||
57254b6e JS |
5080 | static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) |
5081 | { | |
54563d41 | 5082 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
57254b6e JS |
5083 | |
5084 | if (!capable(CAP_SYS_ADMIN)) | |
5085 | return -EPERM; | |
5086 | ||
d06f23d6 | 5087 | return btrfs_qgroup_wait_for_completion(root->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); |
8ea05e3a AB |
5094 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5095 | struct btrfs_root_item *root_item = &root->root_item; | |
5096 | struct btrfs_trans_handle *trans; | |
04b285f3 | 5097 | struct timespec ct = current_fs_time(inode->i_sb); |
8ea05e3a | 5098 | int ret = 0; |
dd5f9615 | 5099 | int received_uuid_changed; |
8ea05e3a | 5100 | |
bd60ea0f DS |
5101 | if (!inode_owner_or_capable(inode)) |
5102 | return -EPERM; | |
5103 | ||
8ea05e3a AB |
5104 | ret = mnt_want_write_file(file); |
5105 | if (ret < 0) | |
5106 | return ret; | |
5107 | ||
5108 | down_write(&root->fs_info->subvol_sem); | |
5109 | ||
5110 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { | |
5111 | ret = -EINVAL; | |
5112 | goto out; | |
5113 | } | |
5114 | ||
5115 | if (btrfs_root_readonly(root)) { | |
5116 | ret = -EROFS; | |
5117 | goto out; | |
5118 | } | |
5119 | ||
dd5f9615 SB |
5120 | /* |
5121 | * 1 - root item | |
5122 | * 2 - uuid items (received uuid + subvol uuid) | |
5123 | */ | |
5124 | trans = btrfs_start_transaction(root, 3); | |
8ea05e3a AB |
5125 | if (IS_ERR(trans)) { |
5126 | ret = PTR_ERR(trans); | |
5127 | trans = NULL; | |
5128 | goto out; | |
5129 | } | |
5130 | ||
5131 | sa->rtransid = trans->transid; | |
5132 | sa->rtime.sec = ct.tv_sec; | |
5133 | sa->rtime.nsec = ct.tv_nsec; | |
5134 | ||
dd5f9615 SB |
5135 | received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, |
5136 | BTRFS_UUID_SIZE); | |
5137 | if (received_uuid_changed && | |
5138 | !btrfs_is_empty_uuid(root_item->received_uuid)) | |
5139 | btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, | |
5140 | root_item->received_uuid, | |
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 AB |
5150 | |
5151 | ret = btrfs_update_root(trans, root->fs_info->tree_root, | |
5152 | &root->root_key, &root->root_item); | |
5153 | if (ret < 0) { | |
5154 | btrfs_end_transaction(trans, root); | |
8ea05e3a | 5155 | goto out; |
dd5f9615 SB |
5156 | } |
5157 | if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { | |
5158 | ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, | |
5159 | sa->uuid, | |
5160 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
5161 | root->root_key.objectid); | |
5162 | if (ret < 0 && ret != -EEXIST) { | |
66642832 | 5163 | btrfs_abort_transaction(trans, ret); |
8ea05e3a | 5164 | goto out; |
dd5f9615 SB |
5165 | } |
5166 | } | |
5167 | ret = btrfs_commit_transaction(trans, root); | |
5168 | if (ret < 0) { | |
66642832 | 5169 | btrfs_abort_transaction(trans, ret); |
dd5f9615 | 5170 | goto out; |
8ea05e3a AB |
5171 | } |
5172 | ||
abccd00f HM |
5173 | out: |
5174 | up_write(&root->fs_info->subvol_sem); | |
5175 | mnt_drop_write_file(file); | |
5176 | return ret; | |
5177 | } | |
5178 | ||
5179 | #ifdef CONFIG_64BIT | |
5180 | static long btrfs_ioctl_set_received_subvol_32(struct file *file, | |
5181 | void __user *arg) | |
5182 | { | |
5183 | struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; | |
5184 | struct btrfs_ioctl_received_subvol_args *args64 = NULL; | |
5185 | int ret = 0; | |
5186 | ||
5187 | args32 = memdup_user(arg, sizeof(*args32)); | |
5188 | if (IS_ERR(args32)) { | |
5189 | ret = PTR_ERR(args32); | |
5190 | args32 = NULL; | |
5191 | goto out; | |
5192 | } | |
5193 | ||
8d2db785 | 5194 | args64 = kmalloc(sizeof(*args64), GFP_KERNEL); |
84dbeb87 DC |
5195 | if (!args64) { |
5196 | ret = -ENOMEM; | |
abccd00f HM |
5197 | goto out; |
5198 | } | |
5199 | ||
5200 | memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); | |
5201 | args64->stransid = args32->stransid; | |
5202 | args64->rtransid = args32->rtransid; | |
5203 | args64->stime.sec = args32->stime.sec; | |
5204 | args64->stime.nsec = args32->stime.nsec; | |
5205 | args64->rtime.sec = args32->rtime.sec; | |
5206 | args64->rtime.nsec = args32->rtime.nsec; | |
5207 | args64->flags = args32->flags; | |
5208 | ||
5209 | ret = _btrfs_ioctl_set_received_subvol(file, args64); | |
5210 | if (ret) | |
5211 | goto out; | |
5212 | ||
5213 | memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); | |
5214 | args32->stransid = args64->stransid; | |
5215 | args32->rtransid = args64->rtransid; | |
5216 | args32->stime.sec = args64->stime.sec; | |
5217 | args32->stime.nsec = args64->stime.nsec; | |
5218 | args32->rtime.sec = args64->rtime.sec; | |
5219 | args32->rtime.nsec = args64->rtime.nsec; | |
5220 | args32->flags = args64->flags; | |
5221 | ||
5222 | ret = copy_to_user(arg, args32, sizeof(*args32)); | |
5223 | if (ret) | |
5224 | ret = -EFAULT; | |
5225 | ||
5226 | out: | |
5227 | kfree(args32); | |
5228 | kfree(args64); | |
5229 | return ret; | |
5230 | } | |
5231 | #endif | |
5232 | ||
5233 | static long btrfs_ioctl_set_received_subvol(struct file *file, | |
5234 | void __user *arg) | |
5235 | { | |
5236 | struct btrfs_ioctl_received_subvol_args *sa = NULL; | |
5237 | int ret = 0; | |
5238 | ||
5239 | sa = memdup_user(arg, sizeof(*sa)); | |
5240 | if (IS_ERR(sa)) { | |
5241 | ret = PTR_ERR(sa); | |
5242 | sa = NULL; | |
5243 | goto out; | |
5244 | } | |
5245 | ||
5246 | ret = _btrfs_ioctl_set_received_subvol(file, sa); | |
5247 | ||
5248 | if (ret) | |
5249 | goto out; | |
5250 | ||
8ea05e3a AB |
5251 | ret = copy_to_user(arg, sa, sizeof(*sa)); |
5252 | if (ret) | |
5253 | ret = -EFAULT; | |
5254 | ||
5255 | out: | |
5256 | kfree(sa); | |
8ea05e3a AB |
5257 | return ret; |
5258 | } | |
5259 | ||
867ab667 | 5260 | static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) |
5261 | { | |
6d0379ec | 5262 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
a1b83ac5 | 5263 | size_t len; |
867ab667 | 5264 | int ret; |
a1b83ac5 AJ |
5265 | char label[BTRFS_LABEL_SIZE]; |
5266 | ||
5267 | spin_lock(&root->fs_info->super_lock); | |
5268 | memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); | |
5269 | spin_unlock(&root->fs_info->super_lock); | |
5270 | ||
5271 | len = strnlen(label, BTRFS_LABEL_SIZE); | |
867ab667 | 5272 | |
5273 | if (len == BTRFS_LABEL_SIZE) { | |
efe120a0 FH |
5274 | btrfs_warn(root->fs_info, |
5275 | "label is too long, return the first %zu bytes", --len); | |
867ab667 | 5276 | } |
5277 | ||
867ab667 | 5278 | ret = copy_to_user(arg, label, len); |
867ab667 | 5279 | |
5280 | return ret ? -EFAULT : 0; | |
5281 | } | |
5282 | ||
a8bfd4ab | 5283 | static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) |
5284 | { | |
6d0379ec | 5285 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
a8bfd4ab | 5286 | struct btrfs_super_block *super_block = root->fs_info->super_copy; |
5287 | struct btrfs_trans_handle *trans; | |
5288 | char label[BTRFS_LABEL_SIZE]; | |
5289 | int ret; | |
5290 | ||
5291 | if (!capable(CAP_SYS_ADMIN)) | |
5292 | return -EPERM; | |
5293 | ||
5294 | if (copy_from_user(label, arg, sizeof(label))) | |
5295 | return -EFAULT; | |
5296 | ||
5297 | if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { | |
efe120a0 | 5298 | btrfs_err(root->fs_info, "unable to set label with more than %d bytes", |
a8bfd4ab | 5299 | BTRFS_LABEL_SIZE - 1); |
5300 | return -EINVAL; | |
5301 | } | |
5302 | ||
5303 | ret = mnt_want_write_file(file); | |
5304 | if (ret) | |
5305 | return ret; | |
5306 | ||
a8bfd4ab | 5307 | trans = btrfs_start_transaction(root, 0); |
5308 | if (IS_ERR(trans)) { | |
5309 | ret = PTR_ERR(trans); | |
5310 | goto out_unlock; | |
5311 | } | |
5312 | ||
a1b83ac5 | 5313 | spin_lock(&root->fs_info->super_lock); |
a8bfd4ab | 5314 | strcpy(super_block->label, label); |
a1b83ac5 | 5315 | spin_unlock(&root->fs_info->super_lock); |
d0270aca | 5316 | ret = btrfs_commit_transaction(trans, root); |
a8bfd4ab | 5317 | |
5318 | out_unlock: | |
a8bfd4ab | 5319 | mnt_drop_write_file(file); |
5320 | return ret; | |
5321 | } | |
5322 | ||
2eaa055f JM |
5323 | #define INIT_FEATURE_FLAGS(suffix) \ |
5324 | { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ | |
5325 | .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ | |
5326 | .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } | |
5327 | ||
d5131b65 | 5328 | int btrfs_ioctl_get_supported_features(void __user *arg) |
2eaa055f | 5329 | { |
4d4ab6d6 | 5330 | static const struct btrfs_ioctl_feature_flags features[3] = { |
2eaa055f JM |
5331 | INIT_FEATURE_FLAGS(SUPP), |
5332 | INIT_FEATURE_FLAGS(SAFE_SET), | |
5333 | INIT_FEATURE_FLAGS(SAFE_CLEAR) | |
5334 | }; | |
5335 | ||
5336 | if (copy_to_user(arg, &features, sizeof(features))) | |
5337 | return -EFAULT; | |
5338 | ||
5339 | return 0; | |
5340 | } | |
5341 | ||
5342 | static int btrfs_ioctl_get_features(struct file *file, void __user *arg) | |
5343 | { | |
5344 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; | |
5345 | struct btrfs_super_block *super_block = root->fs_info->super_copy; | |
5346 | struct btrfs_ioctl_feature_flags features; | |
5347 | ||
5348 | features.compat_flags = btrfs_super_compat_flags(super_block); | |
5349 | features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); | |
5350 | features.incompat_flags = btrfs_super_incompat_flags(super_block); | |
5351 | ||
5352 | if (copy_to_user(arg, &features, sizeof(features))) | |
5353 | return -EFAULT; | |
5354 | ||
5355 | return 0; | |
5356 | } | |
5357 | ||
3b02a68a JM |
5358 | static int check_feature_bits(struct btrfs_root *root, |
5359 | enum btrfs_feature_set set, | |
2eaa055f JM |
5360 | u64 change_mask, u64 flags, u64 supported_flags, |
5361 | u64 safe_set, u64 safe_clear) | |
5362 | { | |
3b02a68a JM |
5363 | const char *type = btrfs_feature_set_names[set]; |
5364 | char *names; | |
2eaa055f JM |
5365 | u64 disallowed, unsupported; |
5366 | u64 set_mask = flags & change_mask; | |
5367 | u64 clear_mask = ~flags & change_mask; | |
5368 | ||
5369 | unsupported = set_mask & ~supported_flags; | |
5370 | if (unsupported) { | |
3b02a68a JM |
5371 | names = btrfs_printable_features(set, unsupported); |
5372 | if (names) { | |
5373 | btrfs_warn(root->fs_info, | |
5374 | "this kernel does not support the %s feature bit%s", | |
5375 | names, strchr(names, ',') ? "s" : ""); | |
5376 | kfree(names); | |
5377 | } else | |
5378 | btrfs_warn(root->fs_info, | |
2eaa055f JM |
5379 | "this kernel does not support %s bits 0x%llx", |
5380 | type, unsupported); | |
5381 | return -EOPNOTSUPP; | |
5382 | } | |
5383 | ||
5384 | disallowed = set_mask & ~safe_set; | |
5385 | if (disallowed) { | |
3b02a68a JM |
5386 | names = btrfs_printable_features(set, disallowed); |
5387 | if (names) { | |
5388 | btrfs_warn(root->fs_info, | |
5389 | "can't set the %s feature bit%s while mounted", | |
5390 | names, strchr(names, ',') ? "s" : ""); | |
5391 | kfree(names); | |
5392 | } else | |
5393 | btrfs_warn(root->fs_info, | |
2eaa055f JM |
5394 | "can't set %s bits 0x%llx while mounted", |
5395 | type, disallowed); | |
5396 | return -EPERM; | |
5397 | } | |
5398 | ||
5399 | disallowed = clear_mask & ~safe_clear; | |
5400 | if (disallowed) { | |
3b02a68a JM |
5401 | names = btrfs_printable_features(set, disallowed); |
5402 | if (names) { | |
5403 | btrfs_warn(root->fs_info, | |
5404 | "can't clear the %s feature bit%s while mounted", | |
5405 | names, strchr(names, ',') ? "s" : ""); | |
5406 | kfree(names); | |
5407 | } else | |
5408 | btrfs_warn(root->fs_info, | |
2eaa055f JM |
5409 | "can't clear %s bits 0x%llx while mounted", |
5410 | type, disallowed); | |
5411 | return -EPERM; | |
5412 | } | |
5413 | ||
5414 | return 0; | |
5415 | } | |
5416 | ||
5417 | #define check_feature(root, change_mask, flags, mask_base) \ | |
3b02a68a | 5418 | check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ |
2eaa055f JM |
5419 | BTRFS_FEATURE_ ## mask_base ## _SUPP, \ |
5420 | BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ | |
5421 | BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) | |
5422 | ||
5423 | static int btrfs_ioctl_set_features(struct file *file, void __user *arg) | |
5424 | { | |
5425 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; | |
5426 | struct btrfs_super_block *super_block = root->fs_info->super_copy; | |
5427 | struct btrfs_ioctl_feature_flags flags[2]; | |
5428 | struct btrfs_trans_handle *trans; | |
5429 | u64 newflags; | |
5430 | int ret; | |
5431 | ||
5432 | if (!capable(CAP_SYS_ADMIN)) | |
5433 | return -EPERM; | |
5434 | ||
5435 | if (copy_from_user(flags, arg, sizeof(flags))) | |
5436 | return -EFAULT; | |
5437 | ||
5438 | /* Nothing to do */ | |
5439 | if (!flags[0].compat_flags && !flags[0].compat_ro_flags && | |
5440 | !flags[0].incompat_flags) | |
5441 | return 0; | |
5442 | ||
5443 | ret = check_feature(root, flags[0].compat_flags, | |
5444 | flags[1].compat_flags, COMPAT); | |
5445 | if (ret) | |
5446 | return ret; | |
5447 | ||
5448 | ret = check_feature(root, flags[0].compat_ro_flags, | |
5449 | flags[1].compat_ro_flags, COMPAT_RO); | |
5450 | if (ret) | |
5451 | return ret; | |
5452 | ||
5453 | ret = check_feature(root, flags[0].incompat_flags, | |
5454 | flags[1].incompat_flags, INCOMPAT); | |
5455 | if (ret) | |
5456 | return ret; | |
5457 | ||
7ab19625 DS |
5458 | ret = mnt_want_write_file(file); |
5459 | if (ret) | |
5460 | return ret; | |
5461 | ||
8051aa1a | 5462 | trans = btrfs_start_transaction(root, 0); |
7ab19625 DS |
5463 | if (IS_ERR(trans)) { |
5464 | ret = PTR_ERR(trans); | |
5465 | goto out_drop_write; | |
5466 | } | |
2eaa055f JM |
5467 | |
5468 | spin_lock(&root->fs_info->super_lock); | |
5469 | newflags = btrfs_super_compat_flags(super_block); | |
5470 | newflags |= flags[0].compat_flags & flags[1].compat_flags; | |
5471 | newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); | |
5472 | btrfs_set_super_compat_flags(super_block, newflags); | |
5473 | ||
5474 | newflags = btrfs_super_compat_ro_flags(super_block); | |
5475 | newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; | |
5476 | newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); | |
5477 | btrfs_set_super_compat_ro_flags(super_block, newflags); | |
5478 | ||
5479 | newflags = btrfs_super_incompat_flags(super_block); | |
5480 | newflags |= flags[0].incompat_flags & flags[1].incompat_flags; | |
5481 | newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); | |
5482 | btrfs_set_super_incompat_flags(super_block, newflags); | |
5483 | spin_unlock(&root->fs_info->super_lock); | |
5484 | ||
7ab19625 DS |
5485 | ret = btrfs_commit_transaction(trans, root); |
5486 | out_drop_write: | |
5487 | mnt_drop_write_file(file); | |
5488 | ||
5489 | return ret; | |
2eaa055f JM |
5490 | } |
5491 | ||
f46b5a66 CH |
5492 | long btrfs_ioctl(struct file *file, unsigned int |
5493 | cmd, unsigned long arg) | |
5494 | { | |
496ad9aa | 5495 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
4bcabaa3 | 5496 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
5497 | |
5498 | switch (cmd) { | |
6cbff00f CH |
5499 | case FS_IOC_GETFLAGS: |
5500 | return btrfs_ioctl_getflags(file, argp); | |
5501 | case FS_IOC_SETFLAGS: | |
5502 | return btrfs_ioctl_setflags(file, argp); | |
5503 | case FS_IOC_GETVERSION: | |
5504 | return btrfs_ioctl_getversion(file, argp); | |
f7039b1d LD |
5505 | case FITRIM: |
5506 | return btrfs_ioctl_fitrim(file, argp); | |
f46b5a66 | 5507 | case BTRFS_IOC_SNAP_CREATE: |
fa0d2b9b | 5508 | return btrfs_ioctl_snap_create(file, argp, 0); |
fdfb1e4f | 5509 | case BTRFS_IOC_SNAP_CREATE_V2: |
fa0d2b9b | 5510 | return btrfs_ioctl_snap_create_v2(file, argp, 0); |
3de4586c | 5511 | case BTRFS_IOC_SUBVOL_CREATE: |
fa0d2b9b | 5512 | return btrfs_ioctl_snap_create(file, argp, 1); |
6f72c7e2 AJ |
5513 | case BTRFS_IOC_SUBVOL_CREATE_V2: |
5514 | return btrfs_ioctl_snap_create_v2(file, argp, 1); | |
76dda93c YZ |
5515 | case BTRFS_IOC_SNAP_DESTROY: |
5516 | return btrfs_ioctl_snap_destroy(file, argp); | |
0caa102d LZ |
5517 | case BTRFS_IOC_SUBVOL_GETFLAGS: |
5518 | return btrfs_ioctl_subvol_getflags(file, argp); | |
5519 | case BTRFS_IOC_SUBVOL_SETFLAGS: | |
5520 | return btrfs_ioctl_subvol_setflags(file, argp); | |
6ef5ed0d JB |
5521 | case BTRFS_IOC_DEFAULT_SUBVOL: |
5522 | return btrfs_ioctl_default_subvol(file, argp); | |
f46b5a66 | 5523 | case BTRFS_IOC_DEFRAG: |
1e701a32 CM |
5524 | return btrfs_ioctl_defrag(file, NULL); |
5525 | case BTRFS_IOC_DEFRAG_RANGE: | |
5526 | return btrfs_ioctl_defrag(file, argp); | |
f46b5a66 | 5527 | case BTRFS_IOC_RESIZE: |
198605a8 | 5528 | return btrfs_ioctl_resize(file, argp); |
f46b5a66 | 5529 | case BTRFS_IOC_ADD_DEV: |
4bcabaa3 | 5530 | return btrfs_ioctl_add_dev(root, argp); |
f46b5a66 | 5531 | case BTRFS_IOC_RM_DEV: |
da24927b | 5532 | return btrfs_ioctl_rm_dev(file, argp); |
6b526ed7 AJ |
5533 | case BTRFS_IOC_RM_DEV_V2: |
5534 | return btrfs_ioctl_rm_dev_v2(file, argp); | |
475f6387 JS |
5535 | case BTRFS_IOC_FS_INFO: |
5536 | return btrfs_ioctl_fs_info(root, argp); | |
5537 | case BTRFS_IOC_DEV_INFO: | |
5538 | return btrfs_ioctl_dev_info(root, argp); | |
f46b5a66 | 5539 | case BTRFS_IOC_BALANCE: |
9ba1f6e4 | 5540 | return btrfs_ioctl_balance(file, NULL); |
f46b5a66 CH |
5541 | case BTRFS_IOC_TRANS_START: |
5542 | return btrfs_ioctl_trans_start(file); | |
5543 | case BTRFS_IOC_TRANS_END: | |
5544 | return btrfs_ioctl_trans_end(file); | |
ac8e9819 CM |
5545 | case BTRFS_IOC_TREE_SEARCH: |
5546 | return btrfs_ioctl_tree_search(file, argp); | |
cc68a8a5 GH |
5547 | case BTRFS_IOC_TREE_SEARCH_V2: |
5548 | return btrfs_ioctl_tree_search_v2(file, argp); | |
ac8e9819 CM |
5549 | case BTRFS_IOC_INO_LOOKUP: |
5550 | return btrfs_ioctl_ino_lookup(file, argp); | |
d7728c96 JS |
5551 | case BTRFS_IOC_INO_PATHS: |
5552 | return btrfs_ioctl_ino_to_path(root, argp); | |
5553 | case BTRFS_IOC_LOGICAL_INO: | |
5554 | return btrfs_ioctl_logical_to_ino(root, argp); | |
1406e432 JB |
5555 | case BTRFS_IOC_SPACE_INFO: |
5556 | return btrfs_ioctl_space_info(root, argp); | |
9b199859 FDBM |
5557 | case BTRFS_IOC_SYNC: { |
5558 | int ret; | |
5559 | ||
6c255e67 | 5560 | ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); |
9b199859 FDBM |
5561 | if (ret) |
5562 | return ret; | |
ddb52f4f | 5563 | ret = btrfs_sync_fs(file_inode(file)->i_sb, 1); |
2fad4e83 DS |
5564 | /* |
5565 | * The transaction thread may want to do more work, | |
01327610 | 5566 | * namely it pokes the cleaner kthread that will start |
2fad4e83 DS |
5567 | * processing uncleaned subvols. |
5568 | */ | |
5569 | wake_up_process(root->fs_info->transaction_kthread); | |
9b199859 FDBM |
5570 | return ret; |
5571 | } | |
46204592 | 5572 | case BTRFS_IOC_START_SYNC: |
9a8c28be | 5573 | return btrfs_ioctl_start_sync(root, argp); |
46204592 | 5574 | case BTRFS_IOC_WAIT_SYNC: |
9a8c28be | 5575 | return btrfs_ioctl_wait_sync(root, argp); |
475f6387 | 5576 | case BTRFS_IOC_SCRUB: |
b8e95489 | 5577 | return btrfs_ioctl_scrub(file, argp); |
475f6387 JS |
5578 | case BTRFS_IOC_SCRUB_CANCEL: |
5579 | return btrfs_ioctl_scrub_cancel(root, argp); | |
5580 | case BTRFS_IOC_SCRUB_PROGRESS: | |
5581 | return btrfs_ioctl_scrub_progress(root, argp); | |
c9e9f97b | 5582 | case BTRFS_IOC_BALANCE_V2: |
9ba1f6e4 | 5583 | return btrfs_ioctl_balance(file, argp); |
837d5b6e ID |
5584 | case BTRFS_IOC_BALANCE_CTL: |
5585 | return btrfs_ioctl_balance_ctl(root, arg); | |
19a39dce ID |
5586 | case BTRFS_IOC_BALANCE_PROGRESS: |
5587 | return btrfs_ioctl_balance_progress(root, argp); | |
8ea05e3a AB |
5588 | case BTRFS_IOC_SET_RECEIVED_SUBVOL: |
5589 | return btrfs_ioctl_set_received_subvol(file, argp); | |
abccd00f HM |
5590 | #ifdef CONFIG_64BIT |
5591 | case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: | |
5592 | return btrfs_ioctl_set_received_subvol_32(file, argp); | |
5593 | #endif | |
31db9f7c AB |
5594 | case BTRFS_IOC_SEND: |
5595 | return btrfs_ioctl_send(file, argp); | |
c11d2c23 | 5596 | case BTRFS_IOC_GET_DEV_STATS: |
b27f7c0c | 5597 | return btrfs_ioctl_get_dev_stats(root, argp); |
5d13a37b | 5598 | case BTRFS_IOC_QUOTA_CTL: |
905b0dda | 5599 | return btrfs_ioctl_quota_ctl(file, argp); |
5d13a37b | 5600 | case BTRFS_IOC_QGROUP_ASSIGN: |
905b0dda | 5601 | return btrfs_ioctl_qgroup_assign(file, argp); |
5d13a37b | 5602 | case BTRFS_IOC_QGROUP_CREATE: |
905b0dda | 5603 | return btrfs_ioctl_qgroup_create(file, argp); |
5d13a37b | 5604 | case BTRFS_IOC_QGROUP_LIMIT: |
905b0dda | 5605 | return btrfs_ioctl_qgroup_limit(file, argp); |
2f232036 JS |
5606 | case BTRFS_IOC_QUOTA_RESCAN: |
5607 | return btrfs_ioctl_quota_rescan(file, argp); | |
5608 | case BTRFS_IOC_QUOTA_RESCAN_STATUS: | |
5609 | return btrfs_ioctl_quota_rescan_status(file, argp); | |
57254b6e JS |
5610 | case BTRFS_IOC_QUOTA_RESCAN_WAIT: |
5611 | return btrfs_ioctl_quota_rescan_wait(file, argp); | |
3f6bcfbd SB |
5612 | case BTRFS_IOC_DEV_REPLACE: |
5613 | return btrfs_ioctl_dev_replace(root, argp); | |
867ab667 | 5614 | case BTRFS_IOC_GET_FSLABEL: |
5615 | return btrfs_ioctl_get_fslabel(file, argp); | |
a8bfd4ab | 5616 | case BTRFS_IOC_SET_FSLABEL: |
5617 | return btrfs_ioctl_set_fslabel(file, argp); | |
2eaa055f | 5618 | case BTRFS_IOC_GET_SUPPORTED_FEATURES: |
d5131b65 | 5619 | return btrfs_ioctl_get_supported_features(argp); |
2eaa055f JM |
5620 | case BTRFS_IOC_GET_FEATURES: |
5621 | return btrfs_ioctl_get_features(file, argp); | |
5622 | case BTRFS_IOC_SET_FEATURES: | |
5623 | return btrfs_ioctl_set_features(file, argp); | |
f46b5a66 CH |
5624 | } |
5625 | ||
5626 | return -ENOTTY; | |
5627 | } | |
4c63c245 LD |
5628 | |
5629 | #ifdef CONFIG_COMPAT | |
5630 | long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
5631 | { | |
5632 | switch (cmd) { | |
5633 | case FS_IOC32_GETFLAGS: | |
5634 | cmd = FS_IOC_GETFLAGS; | |
5635 | break; | |
5636 | case FS_IOC32_SETFLAGS: | |
5637 | cmd = FS_IOC_SETFLAGS; | |
5638 | break; | |
5639 | case FS_IOC32_GETVERSION: | |
5640 | cmd = FS_IOC_GETVERSION; | |
5641 | break; | |
5642 | default: | |
5643 | return -ENOIOCTLCMD; | |
5644 | } | |
5645 | ||
5646 | return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); | |
5647 | } | |
5648 | #endif |