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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" |
f46b5a66 | 62 | |
abccd00f HM |
63 | #ifdef CONFIG_64BIT |
64 | /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI | |
65 | * structures are incorrect, as the timespec structure from userspace | |
66 | * is 4 bytes too small. We define these alternatives here to teach | |
67 | * the kernel about the 32-bit struct packing. | |
68 | */ | |
69 | struct btrfs_ioctl_timespec_32 { | |
70 | __u64 sec; | |
71 | __u32 nsec; | |
72 | } __attribute__ ((__packed__)); | |
73 | ||
74 | struct btrfs_ioctl_received_subvol_args_32 { | |
75 | char uuid[BTRFS_UUID_SIZE]; /* in */ | |
76 | __u64 stransid; /* in */ | |
77 | __u64 rtransid; /* out */ | |
78 | struct btrfs_ioctl_timespec_32 stime; /* in */ | |
79 | struct btrfs_ioctl_timespec_32 rtime; /* out */ | |
80 | __u64 flags; /* in */ | |
81 | __u64 reserved[16]; /* in */ | |
82 | } __attribute__ ((__packed__)); | |
83 | ||
84 | #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ | |
85 | struct btrfs_ioctl_received_subvol_args_32) | |
86 | #endif | |
87 | ||
88 | ||
416161db MF |
89 | static int btrfs_clone(struct inode *src, struct inode *inode, |
90 | u64 off, u64 olen, u64 olen_aligned, u64 destoff); | |
91 | ||
6cbff00f CH |
92 | /* Mask out flags that are inappropriate for the given type of inode. */ |
93 | static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) | |
94 | { | |
95 | if (S_ISDIR(mode)) | |
96 | return flags; | |
97 | else if (S_ISREG(mode)) | |
98 | return flags & ~FS_DIRSYNC_FL; | |
99 | else | |
100 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); | |
101 | } | |
102 | ||
103 | /* | |
104 | * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. | |
105 | */ | |
106 | static unsigned int btrfs_flags_to_ioctl(unsigned int flags) | |
107 | { | |
108 | unsigned int iflags = 0; | |
109 | ||
110 | if (flags & BTRFS_INODE_SYNC) | |
111 | iflags |= FS_SYNC_FL; | |
112 | if (flags & BTRFS_INODE_IMMUTABLE) | |
113 | iflags |= FS_IMMUTABLE_FL; | |
114 | if (flags & BTRFS_INODE_APPEND) | |
115 | iflags |= FS_APPEND_FL; | |
116 | if (flags & BTRFS_INODE_NODUMP) | |
117 | iflags |= FS_NODUMP_FL; | |
118 | if (flags & BTRFS_INODE_NOATIME) | |
119 | iflags |= FS_NOATIME_FL; | |
120 | if (flags & BTRFS_INODE_DIRSYNC) | |
121 | iflags |= FS_DIRSYNC_FL; | |
d0092bdd LZ |
122 | if (flags & BTRFS_INODE_NODATACOW) |
123 | iflags |= FS_NOCOW_FL; | |
124 | ||
125 | if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) | |
126 | iflags |= FS_COMPR_FL; | |
127 | else if (flags & BTRFS_INODE_NOCOMPRESS) | |
128 | iflags |= FS_NOCOMP_FL; | |
6cbff00f CH |
129 | |
130 | return iflags; | |
131 | } | |
132 | ||
133 | /* | |
134 | * Update inode->i_flags based on the btrfs internal flags. | |
135 | */ | |
136 | void btrfs_update_iflags(struct inode *inode) | |
137 | { | |
138 | struct btrfs_inode *ip = BTRFS_I(inode); | |
3cc79392 | 139 | unsigned int new_fl = 0; |
6cbff00f CH |
140 | |
141 | if (ip->flags & BTRFS_INODE_SYNC) | |
3cc79392 | 142 | new_fl |= S_SYNC; |
6cbff00f | 143 | if (ip->flags & BTRFS_INODE_IMMUTABLE) |
3cc79392 | 144 | new_fl |= S_IMMUTABLE; |
6cbff00f | 145 | if (ip->flags & BTRFS_INODE_APPEND) |
3cc79392 | 146 | new_fl |= S_APPEND; |
6cbff00f | 147 | if (ip->flags & BTRFS_INODE_NOATIME) |
3cc79392 | 148 | new_fl |= S_NOATIME; |
6cbff00f | 149 | if (ip->flags & BTRFS_INODE_DIRSYNC) |
3cc79392 FM |
150 | new_fl |= S_DIRSYNC; |
151 | ||
152 | set_mask_bits(&inode->i_flags, | |
153 | S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC, | |
154 | new_fl); | |
6cbff00f CH |
155 | } |
156 | ||
157 | /* | |
158 | * Inherit flags from the parent inode. | |
159 | * | |
e27425d6 | 160 | * Currently only the compression flags and the cow flags are inherited. |
6cbff00f CH |
161 | */ |
162 | void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) | |
163 | { | |
0b4dcea5 CM |
164 | unsigned int flags; |
165 | ||
166 | if (!dir) | |
167 | return; | |
168 | ||
169 | flags = BTRFS_I(dir)->flags; | |
6cbff00f | 170 | |
e27425d6 JB |
171 | if (flags & BTRFS_INODE_NOCOMPRESS) { |
172 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; | |
173 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; | |
174 | } else if (flags & BTRFS_INODE_COMPRESS) { | |
175 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
176 | BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; | |
177 | } | |
178 | ||
213490b3 | 179 | if (flags & BTRFS_INODE_NODATACOW) { |
e27425d6 | 180 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; |
213490b3 LB |
181 | if (S_ISREG(inode->i_mode)) |
182 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; | |
183 | } | |
6cbff00f | 184 | |
6cbff00f CH |
185 | btrfs_update_iflags(inode); |
186 | } | |
187 | ||
188 | static int btrfs_ioctl_getflags(struct file *file, void __user *arg) | |
189 | { | |
496ad9aa | 190 | struct btrfs_inode *ip = BTRFS_I(file_inode(file)); |
6cbff00f CH |
191 | unsigned int flags = btrfs_flags_to_ioctl(ip->flags); |
192 | ||
193 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
194 | return -EFAULT; | |
195 | return 0; | |
196 | } | |
197 | ||
75e7cb7f LB |
198 | static int check_flags(unsigned int flags) |
199 | { | |
200 | if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ | |
201 | FS_NOATIME_FL | FS_NODUMP_FL | \ | |
202 | FS_SYNC_FL | FS_DIRSYNC_FL | \ | |
e1e8fb6a LZ |
203 | FS_NOCOMP_FL | FS_COMPR_FL | |
204 | FS_NOCOW_FL)) | |
75e7cb7f LB |
205 | return -EOPNOTSUPP; |
206 | ||
207 | if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) | |
208 | return -EINVAL; | |
209 | ||
75e7cb7f LB |
210 | return 0; |
211 | } | |
212 | ||
6cbff00f CH |
213 | static int btrfs_ioctl_setflags(struct file *file, void __user *arg) |
214 | { | |
496ad9aa | 215 | struct inode *inode = file_inode(file); |
6cbff00f CH |
216 | struct btrfs_inode *ip = BTRFS_I(inode); |
217 | struct btrfs_root *root = ip->root; | |
218 | struct btrfs_trans_handle *trans; | |
219 | unsigned int flags, oldflags; | |
220 | int ret; | |
f062abf0 LZ |
221 | u64 ip_oldflags; |
222 | unsigned int i_oldflags; | |
7e97b8da | 223 | umode_t mode; |
6cbff00f | 224 | |
bd60ea0f DS |
225 | if (!inode_owner_or_capable(inode)) |
226 | return -EPERM; | |
227 | ||
b83cc969 LZ |
228 | if (btrfs_root_readonly(root)) |
229 | return -EROFS; | |
230 | ||
6cbff00f CH |
231 | if (copy_from_user(&flags, arg, sizeof(flags))) |
232 | return -EFAULT; | |
233 | ||
75e7cb7f LB |
234 | ret = check_flags(flags); |
235 | if (ret) | |
236 | return ret; | |
f46b5a66 | 237 | |
e7848683 JK |
238 | ret = mnt_want_write_file(file); |
239 | if (ret) | |
240 | return ret; | |
241 | ||
6cbff00f CH |
242 | mutex_lock(&inode->i_mutex); |
243 | ||
f062abf0 LZ |
244 | ip_oldflags = ip->flags; |
245 | i_oldflags = inode->i_flags; | |
7e97b8da | 246 | mode = inode->i_mode; |
f062abf0 | 247 | |
6cbff00f CH |
248 | flags = btrfs_mask_flags(inode->i_mode, flags); |
249 | oldflags = btrfs_flags_to_ioctl(ip->flags); | |
250 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { | |
251 | if (!capable(CAP_LINUX_IMMUTABLE)) { | |
252 | ret = -EPERM; | |
253 | goto out_unlock; | |
254 | } | |
255 | } | |
256 | ||
6cbff00f CH |
257 | if (flags & FS_SYNC_FL) |
258 | ip->flags |= BTRFS_INODE_SYNC; | |
259 | else | |
260 | ip->flags &= ~BTRFS_INODE_SYNC; | |
261 | if (flags & FS_IMMUTABLE_FL) | |
262 | ip->flags |= BTRFS_INODE_IMMUTABLE; | |
263 | else | |
264 | ip->flags &= ~BTRFS_INODE_IMMUTABLE; | |
265 | if (flags & FS_APPEND_FL) | |
266 | ip->flags |= BTRFS_INODE_APPEND; | |
267 | else | |
268 | ip->flags &= ~BTRFS_INODE_APPEND; | |
269 | if (flags & FS_NODUMP_FL) | |
270 | ip->flags |= BTRFS_INODE_NODUMP; | |
271 | else | |
272 | ip->flags &= ~BTRFS_INODE_NODUMP; | |
273 | if (flags & FS_NOATIME_FL) | |
274 | ip->flags |= BTRFS_INODE_NOATIME; | |
275 | else | |
276 | ip->flags &= ~BTRFS_INODE_NOATIME; | |
277 | if (flags & FS_DIRSYNC_FL) | |
278 | ip->flags |= BTRFS_INODE_DIRSYNC; | |
279 | else | |
280 | ip->flags &= ~BTRFS_INODE_DIRSYNC; | |
7e97b8da DS |
281 | if (flags & FS_NOCOW_FL) { |
282 | if (S_ISREG(mode)) { | |
283 | /* | |
284 | * It's safe to turn csums off here, no extents exist. | |
285 | * Otherwise we want the flag to reflect the real COW | |
286 | * status of the file and will not set it. | |
287 | */ | |
288 | if (inode->i_size == 0) | |
289 | ip->flags |= BTRFS_INODE_NODATACOW | |
290 | | BTRFS_INODE_NODATASUM; | |
291 | } else { | |
292 | ip->flags |= BTRFS_INODE_NODATACOW; | |
293 | } | |
294 | } else { | |
295 | /* | |
296 | * Revert back under same assuptions as above | |
297 | */ | |
298 | if (S_ISREG(mode)) { | |
299 | if (inode->i_size == 0) | |
300 | ip->flags &= ~(BTRFS_INODE_NODATACOW | |
301 | | BTRFS_INODE_NODATASUM); | |
302 | } else { | |
303 | ip->flags &= ~BTRFS_INODE_NODATACOW; | |
304 | } | |
305 | } | |
6cbff00f | 306 | |
75e7cb7f LB |
307 | /* |
308 | * The COMPRESS flag can only be changed by users, while the NOCOMPRESS | |
309 | * flag may be changed automatically if compression code won't make | |
310 | * things smaller. | |
311 | */ | |
312 | if (flags & FS_NOCOMP_FL) { | |
313 | ip->flags &= ~BTRFS_INODE_COMPRESS; | |
314 | ip->flags |= BTRFS_INODE_NOCOMPRESS; | |
63541927 FDBM |
315 | |
316 | ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); | |
317 | if (ret && ret != -ENODATA) | |
318 | goto out_drop; | |
75e7cb7f | 319 | } else if (flags & FS_COMPR_FL) { |
63541927 FDBM |
320 | const char *comp; |
321 | ||
75e7cb7f LB |
322 | ip->flags |= BTRFS_INODE_COMPRESS; |
323 | ip->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
63541927 FDBM |
324 | |
325 | if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO) | |
326 | comp = "lzo"; | |
327 | else | |
328 | comp = "zlib"; | |
329 | ret = btrfs_set_prop(inode, "btrfs.compression", | |
330 | comp, strlen(comp), 0); | |
331 | if (ret) | |
332 | goto out_drop; | |
333 | ||
ebcb904d | 334 | } else { |
78a017a2 FM |
335 | ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); |
336 | if (ret && ret != -ENODATA) | |
337 | goto out_drop; | |
ebcb904d | 338 | ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); |
75e7cb7f | 339 | } |
6cbff00f | 340 | |
4da6f1a3 | 341 | trans = btrfs_start_transaction(root, 1); |
f062abf0 LZ |
342 | if (IS_ERR(trans)) { |
343 | ret = PTR_ERR(trans); | |
344 | goto out_drop; | |
345 | } | |
6cbff00f | 346 | |
306424cc | 347 | btrfs_update_iflags(inode); |
0c4d2d95 | 348 | inode_inc_iversion(inode); |
306424cc | 349 | inode->i_ctime = CURRENT_TIME; |
6cbff00f | 350 | ret = btrfs_update_inode(trans, root, inode); |
6cbff00f | 351 | |
6cbff00f | 352 | btrfs_end_transaction(trans, root); |
f062abf0 LZ |
353 | out_drop: |
354 | if (ret) { | |
355 | ip->flags = ip_oldflags; | |
356 | inode->i_flags = i_oldflags; | |
357 | } | |
6cbff00f | 358 | |
6cbff00f CH |
359 | out_unlock: |
360 | mutex_unlock(&inode->i_mutex); | |
e7848683 | 361 | mnt_drop_write_file(file); |
2d4e6f6a | 362 | return ret; |
6cbff00f CH |
363 | } |
364 | ||
365 | static int btrfs_ioctl_getversion(struct file *file, int __user *arg) | |
366 | { | |
496ad9aa | 367 | struct inode *inode = file_inode(file); |
6cbff00f CH |
368 | |
369 | return put_user(inode->i_generation, arg); | |
370 | } | |
f46b5a66 | 371 | |
f7039b1d LD |
372 | static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) |
373 | { | |
54563d41 | 374 | struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); |
f7039b1d LD |
375 | struct btrfs_device *device; |
376 | struct request_queue *q; | |
377 | struct fstrim_range range; | |
378 | u64 minlen = ULLONG_MAX; | |
379 | u64 num_devices = 0; | |
815745cf | 380 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
f7039b1d LD |
381 | int ret; |
382 | ||
383 | if (!capable(CAP_SYS_ADMIN)) | |
384 | return -EPERM; | |
385 | ||
1f78160c XG |
386 | rcu_read_lock(); |
387 | list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, | |
388 | dev_list) { | |
f7039b1d LD |
389 | if (!device->bdev) |
390 | continue; | |
391 | q = bdev_get_queue(device->bdev); | |
392 | if (blk_queue_discard(q)) { | |
393 | num_devices++; | |
394 | minlen = min((u64)q->limits.discard_granularity, | |
395 | minlen); | |
396 | } | |
397 | } | |
1f78160c | 398 | rcu_read_unlock(); |
f4c697e6 | 399 | |
f7039b1d LD |
400 | if (!num_devices) |
401 | return -EOPNOTSUPP; | |
f7039b1d LD |
402 | if (copy_from_user(&range, arg, sizeof(range))) |
403 | return -EFAULT; | |
e515c18b LC |
404 | if (range.start > total_bytes || |
405 | range.len < fs_info->sb->s_blocksize) | |
f4c697e6 | 406 | return -EINVAL; |
f7039b1d | 407 | |
f4c697e6 | 408 | range.len = min(range.len, total_bytes - range.start); |
f7039b1d | 409 | range.minlen = max(range.minlen, minlen); |
815745cf | 410 | ret = btrfs_trim_fs(fs_info->tree_root, &range); |
f7039b1d LD |
411 | if (ret < 0) |
412 | return ret; | |
413 | ||
414 | if (copy_to_user(arg, &range, sizeof(range))) | |
415 | return -EFAULT; | |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
dd5f9615 SB |
420 | int btrfs_is_empty_uuid(u8 *uuid) |
421 | { | |
46e0f66a CM |
422 | int i; |
423 | ||
424 | for (i = 0; i < BTRFS_UUID_SIZE; i++) { | |
425 | if (uuid[i]) | |
426 | return 0; | |
427 | } | |
428 | return 1; | |
dd5f9615 SB |
429 | } |
430 | ||
d5c12070 | 431 | static noinline int create_subvol(struct inode *dir, |
cb8e7090 | 432 | struct dentry *dentry, |
72fd032e | 433 | char *name, int namelen, |
6f72c7e2 | 434 | u64 *async_transid, |
8696c533 | 435 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 CH |
436 | { |
437 | struct btrfs_trans_handle *trans; | |
438 | struct btrfs_key key; | |
439 | struct btrfs_root_item root_item; | |
440 | struct btrfs_inode_item *inode_item; | |
441 | struct extent_buffer *leaf; | |
d5c12070 | 442 | struct btrfs_root *root = BTRFS_I(dir)->root; |
76dda93c | 443 | struct btrfs_root *new_root; |
d5c12070 | 444 | struct btrfs_block_rsv block_rsv; |
8ea05e3a | 445 | struct timespec cur_time = CURRENT_TIME; |
5662344b | 446 | struct inode *inode; |
f46b5a66 CH |
447 | int ret; |
448 | int err; | |
449 | u64 objectid; | |
450 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
3de4586c | 451 | u64 index = 0; |
d5c12070 | 452 | u64 qgroup_reserved; |
8ea05e3a | 453 | uuid_le new_uuid; |
f46b5a66 | 454 | |
581bb050 | 455 | ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); |
2fbe8c8a | 456 | if (ret) |
a22285a6 | 457 | return ret; |
6a912213 | 458 | |
d5c12070 | 459 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
9ed74f2d | 460 | /* |
d5c12070 MX |
461 | * The same as the snapshot creation, please see the comment |
462 | * of create_snapshot(). | |
9ed74f2d | 463 | */ |
d5c12070 | 464 | ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, |
dd5f9615 | 465 | 8, &qgroup_reserved, false); |
d5c12070 MX |
466 | if (ret) |
467 | return ret; | |
468 | ||
469 | trans = btrfs_start_transaction(root, 0); | |
470 | if (IS_ERR(trans)) { | |
471 | ret = PTR_ERR(trans); | |
de6e8200 LB |
472 | btrfs_subvolume_release_metadata(root, &block_rsv, |
473 | qgroup_reserved); | |
474 | return ret; | |
d5c12070 MX |
475 | } |
476 | trans->block_rsv = &block_rsv; | |
477 | trans->bytes_reserved = block_rsv.size; | |
f46b5a66 | 478 | |
8696c533 | 479 | ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); |
6f72c7e2 AJ |
480 | if (ret) |
481 | goto fail; | |
482 | ||
4d75f8a9 | 483 | leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0); |
8e8a1e31 JB |
484 | if (IS_ERR(leaf)) { |
485 | ret = PTR_ERR(leaf); | |
486 | goto fail; | |
487 | } | |
f46b5a66 | 488 | |
5d4f98a2 | 489 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
f46b5a66 CH |
490 | btrfs_set_header_bytenr(leaf, leaf->start); |
491 | btrfs_set_header_generation(leaf, trans->transid); | |
5d4f98a2 | 492 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); |
f46b5a66 CH |
493 | btrfs_set_header_owner(leaf, objectid); |
494 | ||
0a4e5586 | 495 | write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), |
f46b5a66 | 496 | BTRFS_FSID_SIZE); |
5d4f98a2 | 497 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, |
b308bc2f | 498 | btrfs_header_chunk_tree_uuid(leaf), |
5d4f98a2 | 499 | BTRFS_UUID_SIZE); |
f46b5a66 CH |
500 | btrfs_mark_buffer_dirty(leaf); |
501 | ||
8ea05e3a AB |
502 | memset(&root_item, 0, sizeof(root_item)); |
503 | ||
f46b5a66 | 504 | inode_item = &root_item.inode; |
3cae210f QW |
505 | btrfs_set_stack_inode_generation(inode_item, 1); |
506 | btrfs_set_stack_inode_size(inode_item, 3); | |
507 | btrfs_set_stack_inode_nlink(inode_item, 1); | |
707e8a07 | 508 | btrfs_set_stack_inode_nbytes(inode_item, root->nodesize); |
3cae210f | 509 | btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); |
f46b5a66 | 510 | |
3cae210f QW |
511 | btrfs_set_root_flags(&root_item, 0); |
512 | btrfs_set_root_limit(&root_item, 0); | |
513 | btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); | |
08fe4db1 | 514 | |
f46b5a66 | 515 | btrfs_set_root_bytenr(&root_item, leaf->start); |
84234f3a | 516 | btrfs_set_root_generation(&root_item, trans->transid); |
f46b5a66 CH |
517 | btrfs_set_root_level(&root_item, 0); |
518 | btrfs_set_root_refs(&root_item, 1); | |
86b9f2ec | 519 | btrfs_set_root_used(&root_item, leaf->len); |
80ff3856 | 520 | btrfs_set_root_last_snapshot(&root_item, 0); |
f46b5a66 | 521 | |
8ea05e3a AB |
522 | btrfs_set_root_generation_v2(&root_item, |
523 | btrfs_root_generation(&root_item)); | |
524 | uuid_le_gen(&new_uuid); | |
525 | memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); | |
3cae210f QW |
526 | btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); |
527 | btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); | |
8ea05e3a AB |
528 | root_item.ctime = root_item.otime; |
529 | btrfs_set_root_ctransid(&root_item, trans->transid); | |
530 | btrfs_set_root_otransid(&root_item, trans->transid); | |
f46b5a66 | 531 | |
925baedd | 532 | btrfs_tree_unlock(leaf); |
f46b5a66 CH |
533 | free_extent_buffer(leaf); |
534 | leaf = NULL; | |
535 | ||
536 | btrfs_set_root_dirid(&root_item, new_dirid); | |
537 | ||
538 | key.objectid = objectid; | |
5d4f98a2 | 539 | key.offset = 0; |
962a298f | 540 | key.type = BTRFS_ROOT_ITEM_KEY; |
f46b5a66 CH |
541 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
542 | &root_item); | |
543 | if (ret) | |
544 | goto fail; | |
545 | ||
76dda93c YZ |
546 | key.offset = (u64)-1; |
547 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); | |
79787eaa JM |
548 | if (IS_ERR(new_root)) { |
549 | btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); | |
550 | ret = PTR_ERR(new_root); | |
551 | goto fail; | |
552 | } | |
76dda93c YZ |
553 | |
554 | btrfs_record_root_in_trans(trans, new_root); | |
555 | ||
63541927 | 556 | ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); |
ce598979 MF |
557 | if (ret) { |
558 | /* We potentially lose an unused inode item here */ | |
79787eaa | 559 | btrfs_abort_transaction(trans, root, ret); |
ce598979 MF |
560 | goto fail; |
561 | } | |
562 | ||
f46b5a66 CH |
563 | /* |
564 | * insert the directory item | |
565 | */ | |
3de4586c | 566 | ret = btrfs_set_inode_index(dir, &index); |
79787eaa JM |
567 | if (ret) { |
568 | btrfs_abort_transaction(trans, root, ret); | |
569 | goto fail; | |
570 | } | |
3de4586c CM |
571 | |
572 | ret = btrfs_insert_dir_item(trans, root, | |
16cdcec7 | 573 | name, namelen, dir, &key, |
3de4586c | 574 | BTRFS_FT_DIR, index); |
79787eaa JM |
575 | if (ret) { |
576 | btrfs_abort_transaction(trans, root, ret); | |
f46b5a66 | 577 | goto fail; |
79787eaa | 578 | } |
0660b5af | 579 | |
52c26179 YZ |
580 | btrfs_i_size_write(dir, dir->i_size + namelen * 2); |
581 | ret = btrfs_update_inode(trans, root, dir); | |
582 | BUG_ON(ret); | |
583 | ||
0660b5af | 584 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
4df27c4d | 585 | objectid, root->root_key.objectid, |
33345d01 | 586 | btrfs_ino(dir), index, name, namelen); |
76dda93c | 587 | BUG_ON(ret); |
f46b5a66 | 588 | |
dd5f9615 SB |
589 | ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, |
590 | root_item.uuid, BTRFS_UUID_KEY_SUBVOL, | |
591 | objectid); | |
592 | if (ret) | |
593 | btrfs_abort_transaction(trans, root, ret); | |
594 | ||
f46b5a66 | 595 | fail: |
d5c12070 MX |
596 | trans->block_rsv = NULL; |
597 | trans->bytes_reserved = 0; | |
de6e8200 LB |
598 | btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); |
599 | ||
72fd032e SW |
600 | if (async_transid) { |
601 | *async_transid = trans->transid; | |
602 | err = btrfs_commit_transaction_async(trans, root, 1); | |
00d71c9c MX |
603 | if (err) |
604 | err = btrfs_commit_transaction(trans, root); | |
72fd032e SW |
605 | } else { |
606 | err = btrfs_commit_transaction(trans, root); | |
607 | } | |
f46b5a66 CH |
608 | if (err && !ret) |
609 | ret = err; | |
1a65e24b | 610 | |
5662344b TI |
611 | if (!ret) { |
612 | inode = btrfs_lookup_dentry(dir, dentry); | |
de6e8200 LB |
613 | if (IS_ERR(inode)) |
614 | return PTR_ERR(inode); | |
5662344b TI |
615 | d_instantiate(dentry, inode); |
616 | } | |
f46b5a66 CH |
617 | return ret; |
618 | } | |
619 | ||
8257b2dc MX |
620 | static void btrfs_wait_nocow_write(struct btrfs_root *root) |
621 | { | |
622 | s64 writers; | |
623 | DEFINE_WAIT(wait); | |
624 | ||
625 | do { | |
626 | prepare_to_wait(&root->subv_writers->wait, &wait, | |
627 | TASK_UNINTERRUPTIBLE); | |
628 | ||
629 | writers = percpu_counter_sum(&root->subv_writers->counter); | |
630 | if (writers) | |
631 | schedule(); | |
632 | ||
633 | finish_wait(&root->subv_writers->wait, &wait); | |
634 | } while (writers); | |
635 | } | |
636 | ||
e9662f70 MX |
637 | static int create_snapshot(struct btrfs_root *root, struct inode *dir, |
638 | struct dentry *dentry, char *name, int namelen, | |
639 | u64 *async_transid, bool readonly, | |
640 | struct btrfs_qgroup_inherit *inherit) | |
f46b5a66 | 641 | { |
2e4bfab9 | 642 | struct inode *inode; |
f46b5a66 CH |
643 | struct btrfs_pending_snapshot *pending_snapshot; |
644 | struct btrfs_trans_handle *trans; | |
2e4bfab9 | 645 | int ret; |
f46b5a66 | 646 | |
27cdeb70 | 647 | if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) |
f46b5a66 CH |
648 | return -EINVAL; |
649 | ||
8257b2dc | 650 | atomic_inc(&root->will_be_snapshoted); |
4e857c58 | 651 | smp_mb__after_atomic(); |
8257b2dc MX |
652 | btrfs_wait_nocow_write(root); |
653 | ||
6a03843d MX |
654 | ret = btrfs_start_delalloc_inodes(root, 0); |
655 | if (ret) | |
8257b2dc | 656 | goto out; |
6a03843d | 657 | |
b0244199 | 658 | btrfs_wait_ordered_extents(root, -1); |
6a03843d | 659 | |
3de4586c | 660 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
8257b2dc MX |
661 | if (!pending_snapshot) { |
662 | ret = -ENOMEM; | |
663 | goto out; | |
664 | } | |
a22285a6 | 665 | |
66d8f3dd MX |
666 | btrfs_init_block_rsv(&pending_snapshot->block_rsv, |
667 | BTRFS_BLOCK_RSV_TEMP); | |
d5c12070 MX |
668 | /* |
669 | * 1 - parent dir inode | |
670 | * 2 - dir entries | |
671 | * 1 - root item | |
672 | * 2 - root ref/backref | |
673 | * 1 - root of snapshot | |
dd5f9615 | 674 | * 1 - UUID item |
d5c12070 MX |
675 | */ |
676 | ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, | |
dd5f9615 | 677 | &pending_snapshot->block_rsv, 8, |
ee3441b4 JM |
678 | &pending_snapshot->qgroup_reserved, |
679 | false); | |
d5c12070 | 680 | if (ret) |
8257b2dc | 681 | goto free; |
d5c12070 | 682 | |
3de4586c | 683 | pending_snapshot->dentry = dentry; |
f46b5a66 | 684 | pending_snapshot->root = root; |
b83cc969 | 685 | pending_snapshot->readonly = readonly; |
e9662f70 | 686 | pending_snapshot->dir = dir; |
8696c533 | 687 | pending_snapshot->inherit = inherit; |
a22285a6 | 688 | |
d5c12070 | 689 | trans = btrfs_start_transaction(root, 0); |
a22285a6 YZ |
690 | if (IS_ERR(trans)) { |
691 | ret = PTR_ERR(trans); | |
692 | goto fail; | |
693 | } | |
694 | ||
8351583e | 695 | spin_lock(&root->fs_info->trans_lock); |
f46b5a66 CH |
696 | list_add(&pending_snapshot->list, |
697 | &trans->transaction->pending_snapshots); | |
8351583e | 698 | spin_unlock(&root->fs_info->trans_lock); |
72fd032e SW |
699 | if (async_transid) { |
700 | *async_transid = trans->transid; | |
701 | ret = btrfs_commit_transaction_async(trans, | |
702 | root->fs_info->extent_root, 1); | |
00d71c9c MX |
703 | if (ret) |
704 | ret = btrfs_commit_transaction(trans, root); | |
72fd032e SW |
705 | } else { |
706 | ret = btrfs_commit_transaction(trans, | |
707 | root->fs_info->extent_root); | |
708 | } | |
aec8030a | 709 | if (ret) |
c37b2b62 | 710 | goto fail; |
a22285a6 YZ |
711 | |
712 | ret = pending_snapshot->error; | |
713 | if (ret) | |
714 | goto fail; | |
715 | ||
2fbe8c8a | 716 | inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); |
2e4bfab9 YZ |
717 | if (IS_ERR(inode)) { |
718 | ret = PTR_ERR(inode); | |
719 | goto fail; | |
720 | } | |
5662344b | 721 | |
2e4bfab9 YZ |
722 | d_instantiate(dentry, inode); |
723 | ret = 0; | |
724 | fail: | |
d5c12070 MX |
725 | btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, |
726 | &pending_snapshot->block_rsv, | |
727 | pending_snapshot->qgroup_reserved); | |
8257b2dc | 728 | free: |
a22285a6 | 729 | kfree(pending_snapshot); |
8257b2dc MX |
730 | out: |
731 | atomic_dec(&root->will_be_snapshoted); | |
f46b5a66 CH |
732 | return ret; |
733 | } | |
734 | ||
4260f7c7 SW |
735 | /* copy of check_sticky in fs/namei.c() |
736 | * It's inline, so penalty for filesystems that don't use sticky bit is | |
737 | * minimal. | |
738 | */ | |
739 | static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) | |
740 | { | |
2f2f43d3 | 741 | kuid_t fsuid = current_fsuid(); |
4260f7c7 SW |
742 | |
743 | if (!(dir->i_mode & S_ISVTX)) | |
744 | return 0; | |
2f2f43d3 | 745 | if (uid_eq(inode->i_uid, fsuid)) |
4260f7c7 | 746 | return 0; |
2f2f43d3 | 747 | if (uid_eq(dir->i_uid, fsuid)) |
4260f7c7 SW |
748 | return 0; |
749 | return !capable(CAP_FOWNER); | |
750 | } | |
751 | ||
752 | /* copy of may_delete in fs/namei.c() | |
753 | * Check whether we can remove a link victim from directory dir, check | |
754 | * whether the type of victim is right. | |
755 | * 1. We can't do it if dir is read-only (done in permission()) | |
756 | * 2. We should have write and exec permissions on dir | |
757 | * 3. We can't remove anything from append-only dir | |
758 | * 4. We can't do anything with immutable dir (done in permission()) | |
759 | * 5. If the sticky bit on dir is set we should either | |
760 | * a. be owner of dir, or | |
761 | * b. be owner of victim, or | |
762 | * c. have CAP_FOWNER capability | |
763 | * 6. If the victim is append-only or immutable we can't do antyhing with | |
764 | * links pointing to it. | |
765 | * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. | |
766 | * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. | |
767 | * 9. We can't remove a root or mountpoint. | |
768 | * 10. We don't allow removal of NFS sillyrenamed files; it's handled by | |
769 | * nfs_async_unlink(). | |
770 | */ | |
771 | ||
67871254 | 772 | static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) |
4260f7c7 SW |
773 | { |
774 | int error; | |
775 | ||
776 | if (!victim->d_inode) | |
777 | return -ENOENT; | |
778 | ||
779 | BUG_ON(victim->d_parent->d_inode != dir); | |
4fa6b5ec | 780 | audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); |
4260f7c7 SW |
781 | |
782 | error = inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
783 | if (error) | |
784 | return error; | |
785 | if (IS_APPEND(dir)) | |
786 | return -EPERM; | |
787 | if (btrfs_check_sticky(dir, victim->d_inode)|| | |
788 | IS_APPEND(victim->d_inode)|| | |
789 | IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) | |
790 | return -EPERM; | |
791 | if (isdir) { | |
792 | if (!S_ISDIR(victim->d_inode->i_mode)) | |
793 | return -ENOTDIR; | |
794 | if (IS_ROOT(victim)) | |
795 | return -EBUSY; | |
796 | } else if (S_ISDIR(victim->d_inode->i_mode)) | |
797 | return -EISDIR; | |
798 | if (IS_DEADDIR(dir)) | |
799 | return -ENOENT; | |
800 | if (victim->d_flags & DCACHE_NFSFS_RENAMED) | |
801 | return -EBUSY; | |
802 | return 0; | |
803 | } | |
804 | ||
cb8e7090 CH |
805 | /* copy of may_create in fs/namei.c() */ |
806 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
807 | { | |
808 | if (child->d_inode) | |
809 | return -EEXIST; | |
810 | if (IS_DEADDIR(dir)) | |
811 | return -ENOENT; | |
812 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
813 | } | |
814 | ||
815 | /* | |
816 | * Create a new subvolume below @parent. This is largely modeled after | |
817 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
818 | * inside this filesystem so it's quite a bit simpler. | |
819 | */ | |
76dda93c YZ |
820 | static noinline int btrfs_mksubvol(struct path *parent, |
821 | char *name, int namelen, | |
72fd032e | 822 | struct btrfs_root *snap_src, |
6f72c7e2 | 823 | u64 *async_transid, bool readonly, |
8696c533 | 824 | struct btrfs_qgroup_inherit *inherit) |
cb8e7090 | 825 | { |
76dda93c | 826 | struct inode *dir = parent->dentry->d_inode; |
cb8e7090 CH |
827 | struct dentry *dentry; |
828 | int error; | |
829 | ||
5c50c9b8 DS |
830 | error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); |
831 | if (error == -EINTR) | |
832 | return error; | |
cb8e7090 CH |
833 | |
834 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
835 | error = PTR_ERR(dentry); | |
836 | if (IS_ERR(dentry)) | |
837 | goto out_unlock; | |
838 | ||
839 | error = -EEXIST; | |
840 | if (dentry->d_inode) | |
841 | goto out_dput; | |
842 | ||
76dda93c | 843 | error = btrfs_may_create(dir, dentry); |
cb8e7090 | 844 | if (error) |
a874a63e | 845 | goto out_dput; |
cb8e7090 | 846 | |
9c52057c CM |
847 | /* |
848 | * even if this name doesn't exist, we may get hash collisions. | |
849 | * check for them now when we can safely fail | |
850 | */ | |
851 | error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, | |
852 | dir->i_ino, name, | |
853 | namelen); | |
854 | if (error) | |
855 | goto out_dput; | |
856 | ||
76dda93c YZ |
857 | down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); |
858 | ||
859 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) | |
860 | goto out_up_read; | |
861 | ||
3de4586c | 862 | if (snap_src) { |
e9662f70 | 863 | error = create_snapshot(snap_src, dir, dentry, name, namelen, |
6f72c7e2 | 864 | async_transid, readonly, inherit); |
3de4586c | 865 | } else { |
d5c12070 MX |
866 | error = create_subvol(dir, dentry, name, namelen, |
867 | async_transid, inherit); | |
3de4586c | 868 | } |
76dda93c YZ |
869 | if (!error) |
870 | fsnotify_mkdir(dir, dentry); | |
871 | out_up_read: | |
872 | up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); | |
cb8e7090 CH |
873 | out_dput: |
874 | dput(dentry); | |
875 | out_unlock: | |
76dda93c | 876 | mutex_unlock(&dir->i_mutex); |
cb8e7090 CH |
877 | return error; |
878 | } | |
879 | ||
4cb5300b CM |
880 | /* |
881 | * When we're defragging a range, we don't want to kick it off again | |
882 | * if it is really just waiting for delalloc to send it down. | |
883 | * If we find a nice big extent or delalloc range for the bytes in the | |
884 | * file you want to defrag, we return 0 to let you know to skip this | |
885 | * part of the file | |
886 | */ | |
aab110ab | 887 | static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) |
4cb5300b CM |
888 | { |
889 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
890 | struct extent_map *em = NULL; | |
891 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
892 | u64 end; | |
893 | ||
894 | read_lock(&em_tree->lock); | |
895 | em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); | |
896 | read_unlock(&em_tree->lock); | |
897 | ||
898 | if (em) { | |
899 | end = extent_map_end(em); | |
900 | free_extent_map(em); | |
901 | if (end - offset > thresh) | |
902 | return 0; | |
903 | } | |
904 | /* if we already have a nice delalloc here, just stop */ | |
905 | thresh /= 2; | |
906 | end = count_range_bits(io_tree, &offset, offset + thresh, | |
907 | thresh, EXTENT_DELALLOC, 1); | |
908 | if (end >= thresh) | |
909 | return 0; | |
910 | return 1; | |
911 | } | |
912 | ||
913 | /* | |
914 | * helper function to walk through a file and find extents | |
915 | * newer than a specific transid, and smaller than thresh. | |
916 | * | |
917 | * This is used by the defragging code to find new and small | |
918 | * extents | |
919 | */ | |
920 | static int find_new_extents(struct btrfs_root *root, | |
921 | struct inode *inode, u64 newer_than, | |
aab110ab | 922 | u64 *off, u32 thresh) |
4cb5300b CM |
923 | { |
924 | struct btrfs_path *path; | |
925 | struct btrfs_key min_key; | |
4cb5300b CM |
926 | struct extent_buffer *leaf; |
927 | struct btrfs_file_extent_item *extent; | |
928 | int type; | |
929 | int ret; | |
a4689d2b | 930 | u64 ino = btrfs_ino(inode); |
4cb5300b CM |
931 | |
932 | path = btrfs_alloc_path(); | |
933 | if (!path) | |
934 | return -ENOMEM; | |
935 | ||
a4689d2b | 936 | min_key.objectid = ino; |
4cb5300b CM |
937 | min_key.type = BTRFS_EXTENT_DATA_KEY; |
938 | min_key.offset = *off; | |
939 | ||
67871254 | 940 | while (1) { |
6174d3cb | 941 | ret = btrfs_search_forward(root, &min_key, path, newer_than); |
4cb5300b CM |
942 | if (ret != 0) |
943 | goto none; | |
f094c9bd | 944 | process_slot: |
a4689d2b | 945 | if (min_key.objectid != ino) |
4cb5300b CM |
946 | goto none; |
947 | if (min_key.type != BTRFS_EXTENT_DATA_KEY) | |
948 | goto none; | |
949 | ||
950 | leaf = path->nodes[0]; | |
951 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
952 | struct btrfs_file_extent_item); | |
953 | ||
954 | type = btrfs_file_extent_type(leaf, extent); | |
955 | if (type == BTRFS_FILE_EXTENT_REG && | |
956 | btrfs_file_extent_num_bytes(leaf, extent) < thresh && | |
957 | check_defrag_in_cache(inode, min_key.offset, thresh)) { | |
958 | *off = min_key.offset; | |
959 | btrfs_free_path(path); | |
960 | return 0; | |
961 | } | |
962 | ||
f094c9bd FM |
963 | path->slots[0]++; |
964 | if (path->slots[0] < btrfs_header_nritems(leaf)) { | |
965 | btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); | |
966 | goto process_slot; | |
967 | } | |
968 | ||
4cb5300b CM |
969 | if (min_key.offset == (u64)-1) |
970 | goto none; | |
971 | ||
972 | min_key.offset++; | |
973 | btrfs_release_path(path); | |
974 | } | |
975 | none: | |
976 | btrfs_free_path(path); | |
977 | return -ENOENT; | |
978 | } | |
979 | ||
6c282eb4 | 980 | static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) |
17ce6ef8 LB |
981 | { |
982 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
6c282eb4 LZ |
983 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
984 | struct extent_map *em; | |
985 | u64 len = PAGE_CACHE_SIZE; | |
17ce6ef8 | 986 | |
6c282eb4 LZ |
987 | /* |
988 | * hopefully we have this extent in the tree already, try without | |
989 | * the full extent lock | |
990 | */ | |
17ce6ef8 | 991 | read_lock(&em_tree->lock); |
6c282eb4 | 992 | em = lookup_extent_mapping(em_tree, start, len); |
17ce6ef8 LB |
993 | read_unlock(&em_tree->lock); |
994 | ||
6c282eb4 | 995 | if (!em) { |
308d9800 FM |
996 | struct extent_state *cached = NULL; |
997 | u64 end = start + len - 1; | |
998 | ||
6c282eb4 | 999 | /* get the big lock and read metadata off disk */ |
308d9800 | 1000 | lock_extent_bits(io_tree, start, end, 0, &cached); |
6c282eb4 | 1001 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); |
308d9800 | 1002 | unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS); |
6c282eb4 LZ |
1003 | |
1004 | if (IS_ERR(em)) | |
1005 | return NULL; | |
1006 | } | |
1007 | ||
1008 | return em; | |
1009 | } | |
17ce6ef8 | 1010 | |
6c282eb4 LZ |
1011 | static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) |
1012 | { | |
1013 | struct extent_map *next; | |
1014 | bool ret = true; | |
1015 | ||
1016 | /* this is the last extent */ | |
1017 | if (em->start + em->len >= i_size_read(inode)) | |
1018 | return false; | |
1019 | ||
1020 | next = defrag_lookup_extent(inode, em->start + em->len); | |
e9512d72 CM |
1021 | if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) |
1022 | ret = false; | |
1023 | else if ((em->block_start + em->block_len == next->block_start) && | |
1024 | (em->block_len > 128 * 1024 && next->block_len > 128 * 1024)) | |
6c282eb4 LZ |
1025 | ret = false; |
1026 | ||
1027 | free_extent_map(next); | |
17ce6ef8 LB |
1028 | return ret; |
1029 | } | |
1030 | ||
aab110ab | 1031 | static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, |
a43a2111 AM |
1032 | u64 *last_len, u64 *skip, u64 *defrag_end, |
1033 | int compress) | |
940100a4 | 1034 | { |
6c282eb4 | 1035 | struct extent_map *em; |
940100a4 | 1036 | int ret = 1; |
6c282eb4 | 1037 | bool next_mergeable = true; |
940100a4 CM |
1038 | |
1039 | /* | |
008873ea | 1040 | * make sure that once we start defragging an extent, we keep on |
940100a4 CM |
1041 | * defragging it |
1042 | */ | |
1043 | if (start < *defrag_end) | |
1044 | return 1; | |
1045 | ||
1046 | *skip = 0; | |
1047 | ||
6c282eb4 LZ |
1048 | em = defrag_lookup_extent(inode, start); |
1049 | if (!em) | |
1050 | return 0; | |
940100a4 CM |
1051 | |
1052 | /* this will cover holes, and inline extents */ | |
17ce6ef8 | 1053 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { |
940100a4 | 1054 | ret = 0; |
17ce6ef8 LB |
1055 | goto out; |
1056 | } | |
1057 | ||
6c282eb4 | 1058 | next_mergeable = defrag_check_next_extent(inode, em); |
940100a4 | 1059 | /* |
6c282eb4 LZ |
1060 | * we hit a real extent, if it is big or the next extent is not a |
1061 | * real extent, don't bother defragging it | |
940100a4 | 1062 | */ |
a43a2111 | 1063 | if (!compress && (*last_len == 0 || *last_len >= thresh) && |
6c282eb4 | 1064 | (em->len >= thresh || !next_mergeable)) |
940100a4 | 1065 | ret = 0; |
17ce6ef8 | 1066 | out: |
940100a4 CM |
1067 | /* |
1068 | * last_len ends up being a counter of how many bytes we've defragged. | |
1069 | * every time we choose not to defrag an extent, we reset *last_len | |
1070 | * so that the next tiny extent will force a defrag. | |
1071 | * | |
1072 | * The end result of this is that tiny extents before a single big | |
1073 | * extent will force at least part of that big extent to be defragged. | |
1074 | */ | |
1075 | if (ret) { | |
940100a4 CM |
1076 | *defrag_end = extent_map_end(em); |
1077 | } else { | |
1078 | *last_len = 0; | |
1079 | *skip = extent_map_end(em); | |
1080 | *defrag_end = 0; | |
1081 | } | |
1082 | ||
1083 | free_extent_map(em); | |
1084 | return ret; | |
1085 | } | |
1086 | ||
4cb5300b CM |
1087 | /* |
1088 | * it doesn't do much good to defrag one or two pages | |
1089 | * at a time. This pulls in a nice chunk of pages | |
1090 | * to COW and defrag. | |
1091 | * | |
1092 | * It also makes sure the delalloc code has enough | |
1093 | * dirty data to avoid making new small extents as part | |
1094 | * of the defrag | |
1095 | * | |
1096 | * It's a good idea to start RA on this range | |
1097 | * before calling this. | |
1098 | */ | |
1099 | static int cluster_pages_for_defrag(struct inode *inode, | |
1100 | struct page **pages, | |
1101 | unsigned long start_index, | |
c41570c9 | 1102 | unsigned long num_pages) |
f46b5a66 | 1103 | { |
4cb5300b CM |
1104 | unsigned long file_end; |
1105 | u64 isize = i_size_read(inode); | |
1106 | u64 page_start; | |
1107 | u64 page_end; | |
1f12bd06 | 1108 | u64 page_cnt; |
4cb5300b CM |
1109 | int ret; |
1110 | int i; | |
1111 | int i_done; | |
3eaa2885 | 1112 | struct btrfs_ordered_extent *ordered; |
4cb5300b | 1113 | struct extent_state *cached_state = NULL; |
600a45e1 | 1114 | struct extent_io_tree *tree; |
3b16a4e3 | 1115 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
4cb5300b | 1116 | |
4cb5300b | 1117 | file_end = (isize - 1) >> PAGE_CACHE_SHIFT; |
1f12bd06 LB |
1118 | if (!isize || start_index > file_end) |
1119 | return 0; | |
1120 | ||
1121 | page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); | |
4cb5300b CM |
1122 | |
1123 | ret = btrfs_delalloc_reserve_space(inode, | |
1f12bd06 | 1124 | page_cnt << PAGE_CACHE_SHIFT); |
4cb5300b CM |
1125 | if (ret) |
1126 | return ret; | |
4cb5300b | 1127 | i_done = 0; |
600a45e1 | 1128 | tree = &BTRFS_I(inode)->io_tree; |
4cb5300b CM |
1129 | |
1130 | /* step one, lock all the pages */ | |
1f12bd06 | 1131 | for (i = 0; i < page_cnt; i++) { |
4cb5300b | 1132 | struct page *page; |
600a45e1 | 1133 | again: |
a94733d0 | 1134 | page = find_or_create_page(inode->i_mapping, |
600a45e1 | 1135 | start_index + i, mask); |
4cb5300b CM |
1136 | if (!page) |
1137 | break; | |
1138 | ||
600a45e1 MX |
1139 | page_start = page_offset(page); |
1140 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
1141 | while (1) { | |
308d9800 FM |
1142 | lock_extent_bits(tree, page_start, page_end, |
1143 | 0, &cached_state); | |
600a45e1 MX |
1144 | ordered = btrfs_lookup_ordered_extent(inode, |
1145 | page_start); | |
308d9800 FM |
1146 | unlock_extent_cached(tree, page_start, page_end, |
1147 | &cached_state, GFP_NOFS); | |
600a45e1 MX |
1148 | if (!ordered) |
1149 | break; | |
1150 | ||
1151 | unlock_page(page); | |
1152 | btrfs_start_ordered_extent(inode, ordered, 1); | |
1153 | btrfs_put_ordered_extent(ordered); | |
1154 | lock_page(page); | |
1f12bd06 LB |
1155 | /* |
1156 | * we unlocked the page above, so we need check if | |
1157 | * it was released or not. | |
1158 | */ | |
1159 | if (page->mapping != inode->i_mapping) { | |
1160 | unlock_page(page); | |
1161 | page_cache_release(page); | |
1162 | goto again; | |
1163 | } | |
600a45e1 MX |
1164 | } |
1165 | ||
4cb5300b CM |
1166 | if (!PageUptodate(page)) { |
1167 | btrfs_readpage(NULL, page); | |
1168 | lock_page(page); | |
1169 | if (!PageUptodate(page)) { | |
1170 | unlock_page(page); | |
1171 | page_cache_release(page); | |
1172 | ret = -EIO; | |
1173 | break; | |
1174 | } | |
1175 | } | |
600a45e1 | 1176 | |
600a45e1 MX |
1177 | if (page->mapping != inode->i_mapping) { |
1178 | unlock_page(page); | |
1179 | page_cache_release(page); | |
1180 | goto again; | |
1181 | } | |
1182 | ||
4cb5300b CM |
1183 | pages[i] = page; |
1184 | i_done++; | |
1185 | } | |
1186 | if (!i_done || ret) | |
1187 | goto out; | |
1188 | ||
1189 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
1190 | goto out; | |
1191 | ||
1192 | /* | |
1193 | * so now we have a nice long stream of locked | |
1194 | * and up to date pages, lets wait on them | |
1195 | */ | |
1196 | for (i = 0; i < i_done; i++) | |
1197 | wait_on_page_writeback(pages[i]); | |
1198 | ||
1199 | page_start = page_offset(pages[0]); | |
1200 | page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; | |
1201 | ||
1202 | lock_extent_bits(&BTRFS_I(inode)->io_tree, | |
d0082371 | 1203 | page_start, page_end - 1, 0, &cached_state); |
4cb5300b CM |
1204 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, |
1205 | page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | | |
9e8a4a8b LB |
1206 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, |
1207 | &cached_state, GFP_NOFS); | |
4cb5300b | 1208 | |
1f12bd06 | 1209 | if (i_done != page_cnt) { |
9e0baf60 JB |
1210 | spin_lock(&BTRFS_I(inode)->lock); |
1211 | BTRFS_I(inode)->outstanding_extents++; | |
1212 | spin_unlock(&BTRFS_I(inode)->lock); | |
4cb5300b | 1213 | btrfs_delalloc_release_space(inode, |
1f12bd06 | 1214 | (page_cnt - i_done) << PAGE_CACHE_SHIFT); |
4cb5300b CM |
1215 | } |
1216 | ||
1217 | ||
9e8a4a8b LB |
1218 | set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, |
1219 | &cached_state, GFP_NOFS); | |
4cb5300b CM |
1220 | |
1221 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, | |
1222 | page_start, page_end - 1, &cached_state, | |
1223 | GFP_NOFS); | |
1224 | ||
1225 | for (i = 0; i < i_done; i++) { | |
1226 | clear_page_dirty_for_io(pages[i]); | |
1227 | ClearPageChecked(pages[i]); | |
1228 | set_page_extent_mapped(pages[i]); | |
1229 | set_page_dirty(pages[i]); | |
1230 | unlock_page(pages[i]); | |
1231 | page_cache_release(pages[i]); | |
1232 | } | |
1233 | return i_done; | |
1234 | out: | |
1235 | for (i = 0; i < i_done; i++) { | |
1236 | unlock_page(pages[i]); | |
1237 | page_cache_release(pages[i]); | |
1238 | } | |
1f12bd06 | 1239 | btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); |
4cb5300b CM |
1240 | return ret; |
1241 | ||
1242 | } | |
1243 | ||
1244 | int btrfs_defrag_file(struct inode *inode, struct file *file, | |
1245 | struct btrfs_ioctl_defrag_range_args *range, | |
1246 | u64 newer_than, unsigned long max_to_defrag) | |
1247 | { | |
1248 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4cb5300b | 1249 | struct file_ra_state *ra = NULL; |
f46b5a66 | 1250 | unsigned long last_index; |
151a31b2 | 1251 | u64 isize = i_size_read(inode); |
940100a4 CM |
1252 | u64 last_len = 0; |
1253 | u64 skip = 0; | |
1254 | u64 defrag_end = 0; | |
4cb5300b | 1255 | u64 newer_off = range->start; |
f46b5a66 | 1256 | unsigned long i; |
008873ea | 1257 | unsigned long ra_index = 0; |
f46b5a66 | 1258 | int ret; |
4cb5300b | 1259 | int defrag_count = 0; |
1a419d85 | 1260 | int compress_type = BTRFS_COMPRESS_ZLIB; |
aab110ab | 1261 | u32 extent_thresh = range->extent_thresh; |
c41570c9 JM |
1262 | unsigned long max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; |
1263 | unsigned long cluster = max_cluster; | |
4cb5300b CM |
1264 | u64 new_align = ~((u64)128 * 1024 - 1); |
1265 | struct page **pages = NULL; | |
1266 | ||
0abd5b17 LB |
1267 | if (isize == 0) |
1268 | return 0; | |
1269 | ||
1270 | if (range->start >= isize) | |
1271 | return -EINVAL; | |
1a419d85 LZ |
1272 | |
1273 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { | |
1274 | if (range->compress_type > BTRFS_COMPRESS_TYPES) | |
1275 | return -EINVAL; | |
1276 | if (range->compress_type) | |
1277 | compress_type = range->compress_type; | |
1278 | } | |
f46b5a66 | 1279 | |
0abd5b17 LB |
1280 | if (extent_thresh == 0) |
1281 | extent_thresh = 256 * 1024; | |
940100a4 | 1282 | |
4cb5300b CM |
1283 | /* |
1284 | * if we were not given a file, allocate a readahead | |
1285 | * context | |
1286 | */ | |
1287 | if (!file) { | |
1288 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
1289 | if (!ra) | |
1290 | return -ENOMEM; | |
1291 | file_ra_state_init(ra, inode->i_mapping); | |
1292 | } else { | |
1293 | ra = &file->f_ra; | |
1294 | } | |
1295 | ||
d9b0d9ba | 1296 | pages = kmalloc_array(max_cluster, sizeof(struct page *), |
4cb5300b CM |
1297 | GFP_NOFS); |
1298 | if (!pages) { | |
1299 | ret = -ENOMEM; | |
1300 | goto out_ra; | |
1301 | } | |
1302 | ||
1303 | /* find the last page to defrag */ | |
1e701a32 | 1304 | if (range->start + range->len > range->start) { |
151a31b2 | 1305 | last_index = min_t(u64, isize - 1, |
1e701a32 CM |
1306 | range->start + range->len - 1) >> PAGE_CACHE_SHIFT; |
1307 | } else { | |
151a31b2 | 1308 | last_index = (isize - 1) >> PAGE_CACHE_SHIFT; |
1e701a32 CM |
1309 | } |
1310 | ||
4cb5300b CM |
1311 | if (newer_than) { |
1312 | ret = find_new_extents(root, inode, newer_than, | |
1313 | &newer_off, 64 * 1024); | |
1314 | if (!ret) { | |
1315 | range->start = newer_off; | |
1316 | /* | |
1317 | * we always align our defrag to help keep | |
1318 | * the extents in the file evenly spaced | |
1319 | */ | |
1320 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; | |
4cb5300b CM |
1321 | } else |
1322 | goto out_ra; | |
1323 | } else { | |
1324 | i = range->start >> PAGE_CACHE_SHIFT; | |
1325 | } | |
1326 | if (!max_to_defrag) | |
7ec31b54 | 1327 | max_to_defrag = last_index + 1; |
4cb5300b | 1328 | |
2a0f7f57 LZ |
1329 | /* |
1330 | * make writeback starts from i, so the defrag range can be | |
1331 | * written sequentially. | |
1332 | */ | |
1333 | if (i < inode->i_mapping->writeback_index) | |
1334 | inode->i_mapping->writeback_index = i; | |
1335 | ||
f7f43cc8 | 1336 | while (i <= last_index && defrag_count < max_to_defrag && |
ed6078f7 | 1337 | (i < DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE))) { |
4cb5300b CM |
1338 | /* |
1339 | * make sure we stop running if someone unmounts | |
1340 | * the FS | |
1341 | */ | |
1342 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
1343 | break; | |
1344 | ||
210549eb | 1345 | if (btrfs_defrag_cancelled(root->fs_info)) { |
efe120a0 | 1346 | printk(KERN_DEBUG "BTRFS: defrag_file cancelled\n"); |
210549eb DS |
1347 | ret = -EAGAIN; |
1348 | break; | |
1349 | } | |
1350 | ||
66c26892 | 1351 | if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, |
6c282eb4 | 1352 | extent_thresh, &last_len, &skip, |
a43a2111 AM |
1353 | &defrag_end, range->flags & |
1354 | BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
940100a4 CM |
1355 | unsigned long next; |
1356 | /* | |
1357 | * the should_defrag function tells us how much to skip | |
1358 | * bump our counter by the suggested amount | |
1359 | */ | |
ed6078f7 | 1360 | next = DIV_ROUND_UP(skip, PAGE_CACHE_SIZE); |
940100a4 CM |
1361 | i = max(i + 1, next); |
1362 | continue; | |
1363 | } | |
008873ea LZ |
1364 | |
1365 | if (!newer_than) { | |
1366 | cluster = (PAGE_CACHE_ALIGN(defrag_end) >> | |
1367 | PAGE_CACHE_SHIFT) - i; | |
1368 | cluster = min(cluster, max_cluster); | |
1369 | } else { | |
1370 | cluster = max_cluster; | |
1371 | } | |
1372 | ||
008873ea LZ |
1373 | if (i + cluster > ra_index) { |
1374 | ra_index = max(i, ra_index); | |
1375 | btrfs_force_ra(inode->i_mapping, ra, file, ra_index, | |
1376 | cluster); | |
1377 | ra_index += max_cluster; | |
1378 | } | |
940100a4 | 1379 | |
ecb8bea8 | 1380 | mutex_lock(&inode->i_mutex); |
633085c7 FDBM |
1381 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) |
1382 | BTRFS_I(inode)->force_compress = compress_type; | |
008873ea | 1383 | ret = cluster_pages_for_defrag(inode, pages, i, cluster); |
ecb8bea8 LB |
1384 | if (ret < 0) { |
1385 | mutex_unlock(&inode->i_mutex); | |
4cb5300b | 1386 | goto out_ra; |
ecb8bea8 | 1387 | } |
4cb5300b CM |
1388 | |
1389 | defrag_count += ret; | |
d0e1d66b | 1390 | balance_dirty_pages_ratelimited(inode->i_mapping); |
ecb8bea8 | 1391 | mutex_unlock(&inode->i_mutex); |
4cb5300b CM |
1392 | |
1393 | if (newer_than) { | |
1394 | if (newer_off == (u64)-1) | |
1395 | break; | |
1396 | ||
e1f041e1 LB |
1397 | if (ret > 0) |
1398 | i += ret; | |
1399 | ||
4cb5300b CM |
1400 | newer_off = max(newer_off + 1, |
1401 | (u64)i << PAGE_CACHE_SHIFT); | |
1402 | ||
1403 | ret = find_new_extents(root, inode, | |
1404 | newer_than, &newer_off, | |
1405 | 64 * 1024); | |
1406 | if (!ret) { | |
1407 | range->start = newer_off; | |
1408 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; | |
4cb5300b CM |
1409 | } else { |
1410 | break; | |
f46b5a66 | 1411 | } |
4cb5300b | 1412 | } else { |
008873ea | 1413 | if (ret > 0) { |
cbcc8326 | 1414 | i += ret; |
008873ea LZ |
1415 | last_len += ret << PAGE_CACHE_SHIFT; |
1416 | } else { | |
cbcc8326 | 1417 | i++; |
008873ea LZ |
1418 | last_len = 0; |
1419 | } | |
f46b5a66 | 1420 | } |
f46b5a66 CH |
1421 | } |
1422 | ||
dec8ef90 | 1423 | if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { |
1e701a32 | 1424 | filemap_flush(inode->i_mapping); |
dec8ef90 FM |
1425 | if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, |
1426 | &BTRFS_I(inode)->runtime_flags)) | |
1427 | filemap_flush(inode->i_mapping); | |
1428 | } | |
1e701a32 CM |
1429 | |
1430 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
1431 | /* the filemap_flush will queue IO into the worker threads, but | |
1432 | * we have to make sure the IO is actually started and that | |
1433 | * ordered extents get created before we return | |
1434 | */ | |
1435 | atomic_inc(&root->fs_info->async_submit_draining); | |
1436 | while (atomic_read(&root->fs_info->nr_async_submits) || | |
1437 | atomic_read(&root->fs_info->async_delalloc_pages)) { | |
1438 | wait_event(root->fs_info->async_submit_wait, | |
1439 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && | |
1440 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); | |
1441 | } | |
1442 | atomic_dec(&root->fs_info->async_submit_draining); | |
1e701a32 CM |
1443 | } |
1444 | ||
1a419d85 | 1445 | if (range->compress_type == BTRFS_COMPRESS_LZO) { |
2b0ce2c2 | 1446 | btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); |
1a419d85 LZ |
1447 | } |
1448 | ||
60ccf82f | 1449 | ret = defrag_count; |
940100a4 | 1450 | |
4cb5300b | 1451 | out_ra: |
633085c7 FDBM |
1452 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { |
1453 | mutex_lock(&inode->i_mutex); | |
1454 | BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; | |
1455 | mutex_unlock(&inode->i_mutex); | |
1456 | } | |
4cb5300b CM |
1457 | if (!file) |
1458 | kfree(ra); | |
1459 | kfree(pages); | |
940100a4 | 1460 | return ret; |
f46b5a66 CH |
1461 | } |
1462 | ||
198605a8 | 1463 | static noinline int btrfs_ioctl_resize(struct file *file, |
76dda93c | 1464 | void __user *arg) |
f46b5a66 CH |
1465 | { |
1466 | u64 new_size; | |
1467 | u64 old_size; | |
1468 | u64 devid = 1; | |
496ad9aa | 1469 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
f46b5a66 CH |
1470 | struct btrfs_ioctl_vol_args *vol_args; |
1471 | struct btrfs_trans_handle *trans; | |
1472 | struct btrfs_device *device = NULL; | |
1473 | char *sizestr; | |
9a40f122 | 1474 | char *retptr; |
f46b5a66 CH |
1475 | char *devstr = NULL; |
1476 | int ret = 0; | |
f46b5a66 CH |
1477 | int mod = 0; |
1478 | ||
e441d54d CM |
1479 | if (!capable(CAP_SYS_ADMIN)) |
1480 | return -EPERM; | |
1481 | ||
198605a8 MX |
1482 | ret = mnt_want_write_file(file); |
1483 | if (ret) | |
1484 | return ret; | |
1485 | ||
5ac00add SB |
1486 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
1487 | 1)) { | |
97547676 | 1488 | mnt_drop_write_file(file); |
e57138b3 | 1489 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
c9e9f97b ID |
1490 | } |
1491 | ||
5ac00add | 1492 | mutex_lock(&root->fs_info->volume_mutex); |
dae7b665 | 1493 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
1494 | if (IS_ERR(vol_args)) { |
1495 | ret = PTR_ERR(vol_args); | |
1496 | goto out; | |
1497 | } | |
5516e595 MF |
1498 | |
1499 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 1500 | |
f46b5a66 CH |
1501 | sizestr = vol_args->name; |
1502 | devstr = strchr(sizestr, ':'); | |
1503 | if (devstr) { | |
f46b5a66 CH |
1504 | sizestr = devstr + 1; |
1505 | *devstr = '\0'; | |
1506 | devstr = vol_args->name; | |
58dfae63 Z |
1507 | ret = kstrtoull(devstr, 10, &devid); |
1508 | if (ret) | |
1509 | goto out_free; | |
dfd79829 MX |
1510 | if (!devid) { |
1511 | ret = -EINVAL; | |
1512 | goto out_free; | |
1513 | } | |
efe120a0 | 1514 | btrfs_info(root->fs_info, "resizing devid %llu", devid); |
f46b5a66 | 1515 | } |
dba60f3f | 1516 | |
aa1b8cd4 | 1517 | device = btrfs_find_device(root->fs_info, devid, NULL, NULL); |
f46b5a66 | 1518 | if (!device) { |
efe120a0 | 1519 | btrfs_info(root->fs_info, "resizer unable to find device %llu", |
c1c9ff7c | 1520 | devid); |
dfd79829 | 1521 | ret = -ENODEV; |
c9e9f97b | 1522 | goto out_free; |
f46b5a66 | 1523 | } |
dba60f3f MX |
1524 | |
1525 | if (!device->writeable) { | |
efe120a0 FH |
1526 | btrfs_info(root->fs_info, |
1527 | "resizer unable to apply on readonly device %llu", | |
c1c9ff7c | 1528 | devid); |
dfd79829 | 1529 | ret = -EPERM; |
4e42ae1b LB |
1530 | goto out_free; |
1531 | } | |
1532 | ||
f46b5a66 CH |
1533 | if (!strcmp(sizestr, "max")) |
1534 | new_size = device->bdev->bd_inode->i_size; | |
1535 | else { | |
1536 | if (sizestr[0] == '-') { | |
1537 | mod = -1; | |
1538 | sizestr++; | |
1539 | } else if (sizestr[0] == '+') { | |
1540 | mod = 1; | |
1541 | sizestr++; | |
1542 | } | |
9a40f122 GH |
1543 | new_size = memparse(sizestr, &retptr); |
1544 | if (*retptr != '\0' || new_size == 0) { | |
f46b5a66 | 1545 | ret = -EINVAL; |
c9e9f97b | 1546 | goto out_free; |
f46b5a66 CH |
1547 | } |
1548 | } | |
1549 | ||
63a212ab | 1550 | if (device->is_tgtdev_for_dev_replace) { |
dfd79829 | 1551 | ret = -EPERM; |
63a212ab SB |
1552 | goto out_free; |
1553 | } | |
1554 | ||
7cc8e58d | 1555 | old_size = btrfs_device_get_total_bytes(device); |
f46b5a66 CH |
1556 | |
1557 | if (mod < 0) { | |
1558 | if (new_size > old_size) { | |
1559 | ret = -EINVAL; | |
c9e9f97b | 1560 | goto out_free; |
f46b5a66 CH |
1561 | } |
1562 | new_size = old_size - new_size; | |
1563 | } else if (mod > 0) { | |
eb8052e0 | 1564 | if (new_size > ULLONG_MAX - old_size) { |
902c68a4 | 1565 | ret = -ERANGE; |
eb8052e0 WF |
1566 | goto out_free; |
1567 | } | |
f46b5a66 CH |
1568 | new_size = old_size + new_size; |
1569 | } | |
1570 | ||
1571 | if (new_size < 256 * 1024 * 1024) { | |
1572 | ret = -EINVAL; | |
c9e9f97b | 1573 | goto out_free; |
f46b5a66 CH |
1574 | } |
1575 | if (new_size > device->bdev->bd_inode->i_size) { | |
1576 | ret = -EFBIG; | |
c9e9f97b | 1577 | goto out_free; |
f46b5a66 CH |
1578 | } |
1579 | ||
1580 | do_div(new_size, root->sectorsize); | |
1581 | new_size *= root->sectorsize; | |
1582 | ||
efe120a0 | 1583 | printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n", |
c1c9ff7c | 1584 | rcu_str_deref(device->name), new_size); |
f46b5a66 CH |
1585 | |
1586 | if (new_size > old_size) { | |
a22285a6 | 1587 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1588 | if (IS_ERR(trans)) { |
1589 | ret = PTR_ERR(trans); | |
c9e9f97b | 1590 | goto out_free; |
98d5dc13 | 1591 | } |
f46b5a66 CH |
1592 | ret = btrfs_grow_device(trans, device, new_size); |
1593 | btrfs_commit_transaction(trans, root); | |
ece7d20e | 1594 | } else if (new_size < old_size) { |
f46b5a66 | 1595 | ret = btrfs_shrink_device(device, new_size); |
0253f40e | 1596 | } /* equal, nothing need to do */ |
f46b5a66 | 1597 | |
c9e9f97b | 1598 | out_free: |
f46b5a66 | 1599 | kfree(vol_args); |
c9e9f97b ID |
1600 | out: |
1601 | mutex_unlock(&root->fs_info->volume_mutex); | |
5ac00add | 1602 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
18f39c41 | 1603 | mnt_drop_write_file(file); |
f46b5a66 CH |
1604 | return ret; |
1605 | } | |
1606 | ||
72fd032e | 1607 | static noinline int btrfs_ioctl_snap_create_transid(struct file *file, |
6f72c7e2 AJ |
1608 | char *name, unsigned long fd, int subvol, |
1609 | u64 *transid, bool readonly, | |
8696c533 | 1610 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 | 1611 | { |
f46b5a66 | 1612 | int namelen; |
3de4586c | 1613 | int ret = 0; |
f46b5a66 | 1614 | |
a874a63e LB |
1615 | ret = mnt_want_write_file(file); |
1616 | if (ret) | |
1617 | goto out; | |
1618 | ||
72fd032e SW |
1619 | namelen = strlen(name); |
1620 | if (strchr(name, '/')) { | |
f46b5a66 | 1621 | ret = -EINVAL; |
a874a63e | 1622 | goto out_drop_write; |
f46b5a66 CH |
1623 | } |
1624 | ||
16780cab CM |
1625 | if (name[0] == '.' && |
1626 | (namelen == 1 || (name[1] == '.' && namelen == 2))) { | |
1627 | ret = -EEXIST; | |
a874a63e | 1628 | goto out_drop_write; |
16780cab CM |
1629 | } |
1630 | ||
3de4586c | 1631 | if (subvol) { |
72fd032e | 1632 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
6f72c7e2 | 1633 | NULL, transid, readonly, inherit); |
cb8e7090 | 1634 | } else { |
2903ff01 | 1635 | struct fd src = fdget(fd); |
3de4586c | 1636 | struct inode *src_inode; |
2903ff01 | 1637 | if (!src.file) { |
3de4586c | 1638 | ret = -EINVAL; |
a874a63e | 1639 | goto out_drop_write; |
3de4586c CM |
1640 | } |
1641 | ||
496ad9aa AV |
1642 | src_inode = file_inode(src.file); |
1643 | if (src_inode->i_sb != file_inode(file)->i_sb) { | |
efe120a0 FH |
1644 | btrfs_info(BTRFS_I(src_inode)->root->fs_info, |
1645 | "Snapshot src from another FS"); | |
23ad5b17 | 1646 | ret = -EXDEV; |
d0242061 DS |
1647 | } else if (!inode_owner_or_capable(src_inode)) { |
1648 | /* | |
1649 | * Subvolume creation is not restricted, but snapshots | |
1650 | * are limited to own subvolumes only | |
1651 | */ | |
1652 | ret = -EPERM; | |
ecd18815 AV |
1653 | } else { |
1654 | ret = btrfs_mksubvol(&file->f_path, name, namelen, | |
1655 | BTRFS_I(src_inode)->root, | |
1656 | transid, readonly, inherit); | |
3de4586c | 1657 | } |
2903ff01 | 1658 | fdput(src); |
cb8e7090 | 1659 | } |
a874a63e LB |
1660 | out_drop_write: |
1661 | mnt_drop_write_file(file); | |
f46b5a66 | 1662 | out: |
72fd032e SW |
1663 | return ret; |
1664 | } | |
1665 | ||
1666 | static noinline int btrfs_ioctl_snap_create(struct file *file, | |
fa0d2b9b | 1667 | void __user *arg, int subvol) |
72fd032e | 1668 | { |
fa0d2b9b | 1669 | struct btrfs_ioctl_vol_args *vol_args; |
72fd032e SW |
1670 | int ret; |
1671 | ||
fa0d2b9b LZ |
1672 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1673 | if (IS_ERR(vol_args)) | |
1674 | return PTR_ERR(vol_args); | |
1675 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
72fd032e | 1676 | |
fa0d2b9b | 1677 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, |
b83cc969 | 1678 | vol_args->fd, subvol, |
6f72c7e2 | 1679 | NULL, false, NULL); |
fdfb1e4f | 1680 | |
fa0d2b9b LZ |
1681 | kfree(vol_args); |
1682 | return ret; | |
1683 | } | |
fdfb1e4f | 1684 | |
fa0d2b9b LZ |
1685 | static noinline int btrfs_ioctl_snap_create_v2(struct file *file, |
1686 | void __user *arg, int subvol) | |
1687 | { | |
1688 | struct btrfs_ioctl_vol_args_v2 *vol_args; | |
1689 | int ret; | |
1690 | u64 transid = 0; | |
1691 | u64 *ptr = NULL; | |
b83cc969 | 1692 | bool readonly = false; |
6f72c7e2 | 1693 | struct btrfs_qgroup_inherit *inherit = NULL; |
75eaa0e2 | 1694 | |
fa0d2b9b LZ |
1695 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1696 | if (IS_ERR(vol_args)) | |
1697 | return PTR_ERR(vol_args); | |
1698 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; | |
75eaa0e2 | 1699 | |
b83cc969 | 1700 | if (vol_args->flags & |
6f72c7e2 AJ |
1701 | ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | |
1702 | BTRFS_SUBVOL_QGROUP_INHERIT)) { | |
b83cc969 | 1703 | ret = -EOPNOTSUPP; |
c47ca32d | 1704 | goto free_args; |
72fd032e | 1705 | } |
fa0d2b9b LZ |
1706 | |
1707 | if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) | |
1708 | ptr = &transid; | |
b83cc969 LZ |
1709 | if (vol_args->flags & BTRFS_SUBVOL_RDONLY) |
1710 | readonly = true; | |
6f72c7e2 AJ |
1711 | if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { |
1712 | if (vol_args->size > PAGE_CACHE_SIZE) { | |
1713 | ret = -EINVAL; | |
c47ca32d | 1714 | goto free_args; |
6f72c7e2 AJ |
1715 | } |
1716 | inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); | |
1717 | if (IS_ERR(inherit)) { | |
1718 | ret = PTR_ERR(inherit); | |
c47ca32d | 1719 | goto free_args; |
6f72c7e2 AJ |
1720 | } |
1721 | } | |
fa0d2b9b LZ |
1722 | |
1723 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, | |
6f72c7e2 | 1724 | vol_args->fd, subvol, ptr, |
8696c533 | 1725 | readonly, inherit); |
c47ca32d DC |
1726 | if (ret) |
1727 | goto free_inherit; | |
fa0d2b9b | 1728 | |
c47ca32d DC |
1729 | if (ptr && copy_to_user(arg + |
1730 | offsetof(struct btrfs_ioctl_vol_args_v2, | |
1731 | transid), | |
1732 | ptr, sizeof(*ptr))) | |
fa0d2b9b | 1733 | ret = -EFAULT; |
c47ca32d DC |
1734 | |
1735 | free_inherit: | |
6f72c7e2 | 1736 | kfree(inherit); |
c47ca32d DC |
1737 | free_args: |
1738 | kfree(vol_args); | |
f46b5a66 CH |
1739 | return ret; |
1740 | } | |
1741 | ||
0caa102d LZ |
1742 | static noinline int btrfs_ioctl_subvol_getflags(struct file *file, |
1743 | void __user *arg) | |
1744 | { | |
496ad9aa | 1745 | struct inode *inode = file_inode(file); |
0caa102d LZ |
1746 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1747 | int ret = 0; | |
1748 | u64 flags = 0; | |
1749 | ||
33345d01 | 1750 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) |
0caa102d LZ |
1751 | return -EINVAL; |
1752 | ||
1753 | down_read(&root->fs_info->subvol_sem); | |
1754 | if (btrfs_root_readonly(root)) | |
1755 | flags |= BTRFS_SUBVOL_RDONLY; | |
1756 | up_read(&root->fs_info->subvol_sem); | |
1757 | ||
1758 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
1759 | ret = -EFAULT; | |
1760 | ||
1761 | return ret; | |
1762 | } | |
1763 | ||
1764 | static noinline int btrfs_ioctl_subvol_setflags(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 | struct btrfs_trans_handle *trans; | |
1770 | u64 root_flags; | |
1771 | u64 flags; | |
1772 | int ret = 0; | |
1773 | ||
bd60ea0f DS |
1774 | if (!inode_owner_or_capable(inode)) |
1775 | return -EPERM; | |
1776 | ||
b9ca0664 LB |
1777 | ret = mnt_want_write_file(file); |
1778 | if (ret) | |
1779 | goto out; | |
0caa102d | 1780 | |
b9ca0664 LB |
1781 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
1782 | ret = -EINVAL; | |
1783 | goto out_drop_write; | |
1784 | } | |
0caa102d | 1785 | |
b9ca0664 LB |
1786 | if (copy_from_user(&flags, arg, sizeof(flags))) { |
1787 | ret = -EFAULT; | |
1788 | goto out_drop_write; | |
1789 | } | |
0caa102d | 1790 | |
b9ca0664 LB |
1791 | if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { |
1792 | ret = -EINVAL; | |
1793 | goto out_drop_write; | |
1794 | } | |
0caa102d | 1795 | |
b9ca0664 LB |
1796 | if (flags & ~BTRFS_SUBVOL_RDONLY) { |
1797 | ret = -EOPNOTSUPP; | |
1798 | goto out_drop_write; | |
1799 | } | |
0caa102d LZ |
1800 | |
1801 | down_write(&root->fs_info->subvol_sem); | |
1802 | ||
1803 | /* nothing to do */ | |
1804 | if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) | |
b9ca0664 | 1805 | goto out_drop_sem; |
0caa102d LZ |
1806 | |
1807 | root_flags = btrfs_root_flags(&root->root_item); | |
2c686537 | 1808 | if (flags & BTRFS_SUBVOL_RDONLY) { |
0caa102d LZ |
1809 | btrfs_set_root_flags(&root->root_item, |
1810 | root_flags | BTRFS_ROOT_SUBVOL_RDONLY); | |
2c686537 DS |
1811 | } else { |
1812 | /* | |
1813 | * Block RO -> RW transition if this subvolume is involved in | |
1814 | * send | |
1815 | */ | |
1816 | spin_lock(&root->root_item_lock); | |
1817 | if (root->send_in_progress == 0) { | |
1818 | btrfs_set_root_flags(&root->root_item, | |
0caa102d | 1819 | root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); |
2c686537 DS |
1820 | spin_unlock(&root->root_item_lock); |
1821 | } else { | |
1822 | spin_unlock(&root->root_item_lock); | |
1823 | btrfs_warn(root->fs_info, | |
1824 | "Attempt to set subvolume %llu read-write during send", | |
1825 | root->root_key.objectid); | |
1826 | ret = -EPERM; | |
1827 | goto out_drop_sem; | |
1828 | } | |
1829 | } | |
0caa102d LZ |
1830 | |
1831 | trans = btrfs_start_transaction(root, 1); | |
1832 | if (IS_ERR(trans)) { | |
1833 | ret = PTR_ERR(trans); | |
1834 | goto out_reset; | |
1835 | } | |
1836 | ||
b4dc2b8c | 1837 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
0caa102d LZ |
1838 | &root->root_key, &root->root_item); |
1839 | ||
1840 | btrfs_commit_transaction(trans, root); | |
1841 | out_reset: | |
1842 | if (ret) | |
1843 | btrfs_set_root_flags(&root->root_item, root_flags); | |
b9ca0664 | 1844 | out_drop_sem: |
0caa102d | 1845 | up_write(&root->fs_info->subvol_sem); |
b9ca0664 LB |
1846 | out_drop_write: |
1847 | mnt_drop_write_file(file); | |
1848 | out: | |
0caa102d LZ |
1849 | return ret; |
1850 | } | |
1851 | ||
76dda93c YZ |
1852 | /* |
1853 | * helper to check if the subvolume references other subvolumes | |
1854 | */ | |
1855 | static noinline int may_destroy_subvol(struct btrfs_root *root) | |
1856 | { | |
1857 | struct btrfs_path *path; | |
175a2b87 | 1858 | struct btrfs_dir_item *di; |
76dda93c | 1859 | struct btrfs_key key; |
175a2b87 | 1860 | u64 dir_id; |
76dda93c YZ |
1861 | int ret; |
1862 | ||
1863 | path = btrfs_alloc_path(); | |
1864 | if (!path) | |
1865 | return -ENOMEM; | |
1866 | ||
175a2b87 JB |
1867 | /* Make sure this root isn't set as the default subvol */ |
1868 | dir_id = btrfs_super_root_dir(root->fs_info->super_copy); | |
1869 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, | |
1870 | dir_id, "default", 7, 0); | |
1871 | if (di && !IS_ERR(di)) { | |
1872 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); | |
1873 | if (key.objectid == root->root_key.objectid) { | |
72de6b53 GS |
1874 | ret = -EPERM; |
1875 | btrfs_err(root->fs_info, "deleting default subvolume " | |
1876 | "%llu is not allowed", key.objectid); | |
175a2b87 JB |
1877 | goto out; |
1878 | } | |
1879 | btrfs_release_path(path); | |
1880 | } | |
1881 | ||
76dda93c YZ |
1882 | key.objectid = root->root_key.objectid; |
1883 | key.type = BTRFS_ROOT_REF_KEY; | |
1884 | key.offset = (u64)-1; | |
1885 | ||
1886 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, | |
1887 | &key, path, 0, 0); | |
1888 | if (ret < 0) | |
1889 | goto out; | |
1890 | BUG_ON(ret == 0); | |
1891 | ||
1892 | ret = 0; | |
1893 | if (path->slots[0] > 0) { | |
1894 | path->slots[0]--; | |
1895 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1896 | if (key.objectid == root->root_key.objectid && | |
1897 | key.type == BTRFS_ROOT_REF_KEY) | |
1898 | ret = -ENOTEMPTY; | |
1899 | } | |
1900 | out: | |
1901 | btrfs_free_path(path); | |
1902 | return ret; | |
1903 | } | |
1904 | ||
ac8e9819 CM |
1905 | static noinline int key_in_sk(struct btrfs_key *key, |
1906 | struct btrfs_ioctl_search_key *sk) | |
1907 | { | |
abc6e134 CM |
1908 | struct btrfs_key test; |
1909 | int ret; | |
1910 | ||
1911 | test.objectid = sk->min_objectid; | |
1912 | test.type = sk->min_type; | |
1913 | test.offset = sk->min_offset; | |
1914 | ||
1915 | ret = btrfs_comp_cpu_keys(key, &test); | |
1916 | if (ret < 0) | |
ac8e9819 | 1917 | return 0; |
abc6e134 CM |
1918 | |
1919 | test.objectid = sk->max_objectid; | |
1920 | test.type = sk->max_type; | |
1921 | test.offset = sk->max_offset; | |
1922 | ||
1923 | ret = btrfs_comp_cpu_keys(key, &test); | |
1924 | if (ret > 0) | |
ac8e9819 CM |
1925 | return 0; |
1926 | return 1; | |
1927 | } | |
1928 | ||
1929 | static noinline int copy_to_sk(struct btrfs_root *root, | |
1930 | struct btrfs_path *path, | |
1931 | struct btrfs_key *key, | |
1932 | struct btrfs_ioctl_search_key *sk, | |
9b6e817d | 1933 | size_t *buf_size, |
ba346b35 | 1934 | char __user *ubuf, |
ac8e9819 CM |
1935 | unsigned long *sk_offset, |
1936 | int *num_found) | |
1937 | { | |
1938 | u64 found_transid; | |
1939 | struct extent_buffer *leaf; | |
1940 | struct btrfs_ioctl_search_header sh; | |
1941 | unsigned long item_off; | |
1942 | unsigned long item_len; | |
1943 | int nritems; | |
1944 | int i; | |
1945 | int slot; | |
ac8e9819 CM |
1946 | int ret = 0; |
1947 | ||
1948 | leaf = path->nodes[0]; | |
1949 | slot = path->slots[0]; | |
1950 | nritems = btrfs_header_nritems(leaf); | |
1951 | ||
1952 | if (btrfs_header_generation(leaf) > sk->max_transid) { | |
1953 | i = nritems; | |
1954 | goto advance_key; | |
1955 | } | |
1956 | found_transid = btrfs_header_generation(leaf); | |
1957 | ||
1958 | for (i = slot; i < nritems; i++) { | |
1959 | item_off = btrfs_item_ptr_offset(leaf, i); | |
1960 | item_len = btrfs_item_size_nr(leaf, i); | |
1961 | ||
03b71c6c GP |
1962 | btrfs_item_key_to_cpu(leaf, key, i); |
1963 | if (!key_in_sk(key, sk)) | |
1964 | continue; | |
1965 | ||
9b6e817d | 1966 | if (sizeof(sh) + item_len > *buf_size) { |
8f5f6178 GH |
1967 | if (*num_found) { |
1968 | ret = 1; | |
1969 | goto out; | |
1970 | } | |
1971 | ||
1972 | /* | |
1973 | * return one empty item back for v1, which does not | |
1974 | * handle -EOVERFLOW | |
1975 | */ | |
1976 | ||
9b6e817d | 1977 | *buf_size = sizeof(sh) + item_len; |
ac8e9819 | 1978 | item_len = 0; |
8f5f6178 GH |
1979 | ret = -EOVERFLOW; |
1980 | } | |
ac8e9819 | 1981 | |
9b6e817d | 1982 | if (sizeof(sh) + item_len + *sk_offset > *buf_size) { |
ac8e9819 | 1983 | ret = 1; |
25c9bc2e | 1984 | goto out; |
ac8e9819 CM |
1985 | } |
1986 | ||
ac8e9819 CM |
1987 | sh.objectid = key->objectid; |
1988 | sh.offset = key->offset; | |
1989 | sh.type = key->type; | |
1990 | sh.len = item_len; | |
1991 | sh.transid = found_transid; | |
1992 | ||
1993 | /* copy search result header */ | |
ba346b35 GH |
1994 | if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) { |
1995 | ret = -EFAULT; | |
1996 | goto out; | |
1997 | } | |
1998 | ||
ac8e9819 CM |
1999 | *sk_offset += sizeof(sh); |
2000 | ||
2001 | if (item_len) { | |
ba346b35 | 2002 | char __user *up = ubuf + *sk_offset; |
ac8e9819 | 2003 | /* copy the item */ |
ba346b35 GH |
2004 | if (read_extent_buffer_to_user(leaf, up, |
2005 | item_off, item_len)) { | |
2006 | ret = -EFAULT; | |
2007 | goto out; | |
2008 | } | |
2009 | ||
ac8e9819 | 2010 | *sk_offset += item_len; |
ac8e9819 | 2011 | } |
e2156867 | 2012 | (*num_found)++; |
ac8e9819 | 2013 | |
8f5f6178 GH |
2014 | if (ret) /* -EOVERFLOW from above */ |
2015 | goto out; | |
2016 | ||
25c9bc2e GH |
2017 | if (*num_found >= sk->nr_items) { |
2018 | ret = 1; | |
2019 | goto out; | |
2020 | } | |
ac8e9819 CM |
2021 | } |
2022 | advance_key: | |
abc6e134 CM |
2023 | ret = 0; |
2024 | if (key->offset < (u64)-1 && key->offset < sk->max_offset) | |
ac8e9819 | 2025 | key->offset++; |
abc6e134 CM |
2026 | else if (key->type < (u8)-1 && key->type < sk->max_type) { |
2027 | key->offset = 0; | |
ac8e9819 | 2028 | key->type++; |
abc6e134 CM |
2029 | } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { |
2030 | key->offset = 0; | |
2031 | key->type = 0; | |
ac8e9819 | 2032 | key->objectid++; |
abc6e134 CM |
2033 | } else |
2034 | ret = 1; | |
25c9bc2e | 2035 | out: |
ba346b35 GH |
2036 | /* |
2037 | * 0: all items from this leaf copied, continue with next | |
2038 | * 1: * more items can be copied, but unused buffer is too small | |
2039 | * * all items were found | |
2040 | * Either way, it will stops the loop which iterates to the next | |
2041 | * leaf | |
2042 | * -EOVERFLOW: item was to large for buffer | |
2043 | * -EFAULT: could not copy extent buffer back to userspace | |
2044 | */ | |
ac8e9819 CM |
2045 | return ret; |
2046 | } | |
2047 | ||
2048 | static noinline int search_ioctl(struct inode *inode, | |
12544442 | 2049 | struct btrfs_ioctl_search_key *sk, |
9b6e817d | 2050 | size_t *buf_size, |
ba346b35 | 2051 | char __user *ubuf) |
ac8e9819 CM |
2052 | { |
2053 | struct btrfs_root *root; | |
2054 | struct btrfs_key key; | |
ac8e9819 | 2055 | struct btrfs_path *path; |
ac8e9819 CM |
2056 | struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; |
2057 | int ret; | |
2058 | int num_found = 0; | |
2059 | unsigned long sk_offset = 0; | |
2060 | ||
9b6e817d GH |
2061 | if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { |
2062 | *buf_size = sizeof(struct btrfs_ioctl_search_header); | |
12544442 | 2063 | return -EOVERFLOW; |
9b6e817d | 2064 | } |
12544442 | 2065 | |
ac8e9819 CM |
2066 | path = btrfs_alloc_path(); |
2067 | if (!path) | |
2068 | return -ENOMEM; | |
2069 | ||
2070 | if (sk->tree_id == 0) { | |
2071 | /* search the root of the inode that was passed */ | |
2072 | root = BTRFS_I(inode)->root; | |
2073 | } else { | |
2074 | key.objectid = sk->tree_id; | |
2075 | key.type = BTRFS_ROOT_ITEM_KEY; | |
2076 | key.offset = (u64)-1; | |
2077 | root = btrfs_read_fs_root_no_name(info, &key); | |
2078 | if (IS_ERR(root)) { | |
efe120a0 | 2079 | printk(KERN_ERR "BTRFS: could not find root %llu\n", |
ac8e9819 CM |
2080 | sk->tree_id); |
2081 | btrfs_free_path(path); | |
2082 | return -ENOENT; | |
2083 | } | |
2084 | } | |
2085 | ||
2086 | key.objectid = sk->min_objectid; | |
2087 | key.type = sk->min_type; | |
2088 | key.offset = sk->min_offset; | |
2089 | ||
67871254 | 2090 | while (1) { |
6174d3cb | 2091 | ret = btrfs_search_forward(root, &key, path, sk->min_transid); |
ac8e9819 CM |
2092 | if (ret != 0) { |
2093 | if (ret > 0) | |
2094 | ret = 0; | |
2095 | goto err; | |
2096 | } | |
ba346b35 | 2097 | ret = copy_to_sk(root, path, &key, sk, buf_size, ubuf, |
ac8e9819 | 2098 | &sk_offset, &num_found); |
b3b4aa74 | 2099 | btrfs_release_path(path); |
25c9bc2e | 2100 | if (ret) |
ac8e9819 CM |
2101 | break; |
2102 | ||
2103 | } | |
8f5f6178 GH |
2104 | if (ret > 0) |
2105 | ret = 0; | |
ac8e9819 CM |
2106 | err: |
2107 | sk->nr_items = num_found; | |
2108 | btrfs_free_path(path); | |
2109 | return ret; | |
2110 | } | |
2111 | ||
2112 | static noinline int btrfs_ioctl_tree_search(struct file *file, | |
2113 | void __user *argp) | |
2114 | { | |
ba346b35 GH |
2115 | struct btrfs_ioctl_search_args __user *uargs; |
2116 | struct btrfs_ioctl_search_key sk; | |
9b6e817d GH |
2117 | struct inode *inode; |
2118 | int ret; | |
2119 | size_t buf_size; | |
ac8e9819 CM |
2120 | |
2121 | if (!capable(CAP_SYS_ADMIN)) | |
2122 | return -EPERM; | |
2123 | ||
ba346b35 GH |
2124 | uargs = (struct btrfs_ioctl_search_args __user *)argp; |
2125 | ||
2126 | if (copy_from_user(&sk, &uargs->key, sizeof(sk))) | |
2127 | return -EFAULT; | |
ac8e9819 | 2128 | |
ba346b35 | 2129 | buf_size = sizeof(uargs->buf); |
ac8e9819 | 2130 | |
496ad9aa | 2131 | inode = file_inode(file); |
ba346b35 | 2132 | ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); |
8f5f6178 GH |
2133 | |
2134 | /* | |
2135 | * In the origin implementation an overflow is handled by returning a | |
2136 | * search header with a len of zero, so reset ret. | |
2137 | */ | |
2138 | if (ret == -EOVERFLOW) | |
2139 | ret = 0; | |
2140 | ||
ba346b35 | 2141 | if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) |
ac8e9819 | 2142 | ret = -EFAULT; |
ac8e9819 CM |
2143 | return ret; |
2144 | } | |
2145 | ||
cc68a8a5 GH |
2146 | static noinline int btrfs_ioctl_tree_search_v2(struct file *file, |
2147 | void __user *argp) | |
2148 | { | |
2149 | struct btrfs_ioctl_search_args_v2 __user *uarg; | |
2150 | struct btrfs_ioctl_search_args_v2 args; | |
2151 | struct inode *inode; | |
2152 | int ret; | |
2153 | size_t buf_size; | |
2154 | const size_t buf_limit = 16 * 1024 * 1024; | |
2155 | ||
2156 | if (!capable(CAP_SYS_ADMIN)) | |
2157 | return -EPERM; | |
2158 | ||
2159 | /* copy search header and buffer size */ | |
2160 | uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; | |
2161 | if (copy_from_user(&args, uarg, sizeof(args))) | |
2162 | return -EFAULT; | |
2163 | ||
2164 | buf_size = args.buf_size; | |
2165 | ||
2166 | if (buf_size < sizeof(struct btrfs_ioctl_search_header)) | |
2167 | return -EOVERFLOW; | |
2168 | ||
2169 | /* limit result size to 16MB */ | |
2170 | if (buf_size > buf_limit) | |
2171 | buf_size = buf_limit; | |
2172 | ||
2173 | inode = file_inode(file); | |
2174 | ret = search_ioctl(inode, &args.key, &buf_size, | |
2175 | (char *)(&uarg->buf[0])); | |
2176 | if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) | |
2177 | ret = -EFAULT; | |
2178 | else if (ret == -EOVERFLOW && | |
2179 | copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) | |
2180 | ret = -EFAULT; | |
2181 | ||
ac8e9819 CM |
2182 | return ret; |
2183 | } | |
2184 | ||
98d377a0 | 2185 | /* |
ac8e9819 CM |
2186 | * Search INODE_REFs to identify path name of 'dirid' directory |
2187 | * in a 'tree_id' tree. and sets path name to 'name'. | |
2188 | */ | |
98d377a0 TH |
2189 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
2190 | u64 tree_id, u64 dirid, char *name) | |
2191 | { | |
2192 | struct btrfs_root *root; | |
2193 | struct btrfs_key key; | |
ac8e9819 | 2194 | char *ptr; |
98d377a0 TH |
2195 | int ret = -1; |
2196 | int slot; | |
2197 | int len; | |
2198 | int total_len = 0; | |
2199 | struct btrfs_inode_ref *iref; | |
2200 | struct extent_buffer *l; | |
2201 | struct btrfs_path *path; | |
2202 | ||
2203 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { | |
2204 | name[0]='\0'; | |
2205 | return 0; | |
2206 | } | |
2207 | ||
2208 | path = btrfs_alloc_path(); | |
2209 | if (!path) | |
2210 | return -ENOMEM; | |
2211 | ||
ac8e9819 | 2212 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; |
98d377a0 TH |
2213 | |
2214 | key.objectid = tree_id; | |
2215 | key.type = BTRFS_ROOT_ITEM_KEY; | |
2216 | key.offset = (u64)-1; | |
2217 | root = btrfs_read_fs_root_no_name(info, &key); | |
2218 | if (IS_ERR(root)) { | |
efe120a0 | 2219 | printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id); |
8ad6fcab CM |
2220 | ret = -ENOENT; |
2221 | goto out; | |
98d377a0 TH |
2222 | } |
2223 | ||
2224 | key.objectid = dirid; | |
2225 | key.type = BTRFS_INODE_REF_KEY; | |
8ad6fcab | 2226 | key.offset = (u64)-1; |
98d377a0 | 2227 | |
67871254 | 2228 | while (1) { |
98d377a0 TH |
2229 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
2230 | if (ret < 0) | |
2231 | goto out; | |
18674c6c FDBM |
2232 | else if (ret > 0) { |
2233 | ret = btrfs_previous_item(root, path, dirid, | |
2234 | BTRFS_INODE_REF_KEY); | |
2235 | if (ret < 0) | |
2236 | goto out; | |
2237 | else if (ret > 0) { | |
2238 | ret = -ENOENT; | |
2239 | goto out; | |
2240 | } | |
2241 | } | |
98d377a0 TH |
2242 | |
2243 | l = path->nodes[0]; | |
2244 | slot = path->slots[0]; | |
2245 | btrfs_item_key_to_cpu(l, &key, slot); | |
2246 | ||
98d377a0 TH |
2247 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); |
2248 | len = btrfs_inode_ref_name_len(l, iref); | |
2249 | ptr -= len + 1; | |
2250 | total_len += len + 1; | |
a696cf35 FDBM |
2251 | if (ptr < name) { |
2252 | ret = -ENAMETOOLONG; | |
98d377a0 | 2253 | goto out; |
a696cf35 | 2254 | } |
98d377a0 TH |
2255 | |
2256 | *(ptr + len) = '/'; | |
67871254 | 2257 | read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); |
98d377a0 TH |
2258 | |
2259 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) | |
2260 | break; | |
2261 | ||
b3b4aa74 | 2262 | btrfs_release_path(path); |
98d377a0 | 2263 | key.objectid = key.offset; |
8ad6fcab | 2264 | key.offset = (u64)-1; |
98d377a0 | 2265 | dirid = key.objectid; |
98d377a0 | 2266 | } |
77906a50 | 2267 | memmove(name, ptr, total_len); |
67871254 | 2268 | name[total_len] = '\0'; |
98d377a0 TH |
2269 | ret = 0; |
2270 | out: | |
2271 | btrfs_free_path(path); | |
ac8e9819 CM |
2272 | return ret; |
2273 | } | |
2274 | ||
2275 | static noinline int btrfs_ioctl_ino_lookup(struct file *file, | |
2276 | void __user *argp) | |
2277 | { | |
2278 | struct btrfs_ioctl_ino_lookup_args *args; | |
2279 | struct inode *inode; | |
2280 | int ret; | |
2281 | ||
2282 | if (!capable(CAP_SYS_ADMIN)) | |
2283 | return -EPERM; | |
2284 | ||
2354d08f JL |
2285 | args = memdup_user(argp, sizeof(*args)); |
2286 | if (IS_ERR(args)) | |
2287 | return PTR_ERR(args); | |
c2b96929 | 2288 | |
496ad9aa | 2289 | inode = file_inode(file); |
ac8e9819 | 2290 | |
1b53ac4d CM |
2291 | if (args->treeid == 0) |
2292 | args->treeid = BTRFS_I(inode)->root->root_key.objectid; | |
2293 | ||
ac8e9819 CM |
2294 | ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, |
2295 | args->treeid, args->objectid, | |
2296 | args->name); | |
2297 | ||
2298 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
2299 | ret = -EFAULT; | |
2300 | ||
2301 | kfree(args); | |
98d377a0 TH |
2302 | return ret; |
2303 | } | |
2304 | ||
76dda93c YZ |
2305 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
2306 | void __user *arg) | |
2307 | { | |
54563d41 | 2308 | struct dentry *parent = file->f_path.dentry; |
76dda93c YZ |
2309 | struct dentry *dentry; |
2310 | struct inode *dir = parent->d_inode; | |
2311 | struct inode *inode; | |
2312 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2313 | struct btrfs_root *dest = NULL; | |
2314 | struct btrfs_ioctl_vol_args *vol_args; | |
2315 | struct btrfs_trans_handle *trans; | |
c58aaad2 | 2316 | struct btrfs_block_rsv block_rsv; |
521e0546 | 2317 | u64 root_flags; |
c58aaad2 | 2318 | u64 qgroup_reserved; |
76dda93c YZ |
2319 | int namelen; |
2320 | int ret; | |
2321 | int err = 0; | |
2322 | ||
76dda93c YZ |
2323 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
2324 | if (IS_ERR(vol_args)) | |
2325 | return PTR_ERR(vol_args); | |
2326 | ||
2327 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
2328 | namelen = strlen(vol_args->name); | |
2329 | if (strchr(vol_args->name, '/') || | |
2330 | strncmp(vol_args->name, "..", namelen) == 0) { | |
2331 | err = -EINVAL; | |
2332 | goto out; | |
2333 | } | |
2334 | ||
a561be71 | 2335 | err = mnt_want_write_file(file); |
76dda93c YZ |
2336 | if (err) |
2337 | goto out; | |
2338 | ||
521e0546 | 2339 | |
5c50c9b8 DS |
2340 | err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); |
2341 | if (err == -EINTR) | |
e43f998e | 2342 | goto out_drop_write; |
76dda93c YZ |
2343 | dentry = lookup_one_len(vol_args->name, parent, namelen); |
2344 | if (IS_ERR(dentry)) { | |
2345 | err = PTR_ERR(dentry); | |
2346 | goto out_unlock_dir; | |
2347 | } | |
2348 | ||
2349 | if (!dentry->d_inode) { | |
2350 | err = -ENOENT; | |
2351 | goto out_dput; | |
2352 | } | |
2353 | ||
2354 | inode = dentry->d_inode; | |
4260f7c7 | 2355 | dest = BTRFS_I(inode)->root; |
67871254 | 2356 | if (!capable(CAP_SYS_ADMIN)) { |
4260f7c7 SW |
2357 | /* |
2358 | * Regular user. Only allow this with a special mount | |
2359 | * option, when the user has write+exec access to the | |
2360 | * subvol root, and when rmdir(2) would have been | |
2361 | * allowed. | |
2362 | * | |
2363 | * Note that this is _not_ check that the subvol is | |
2364 | * empty or doesn't contain data that we wouldn't | |
2365 | * otherwise be able to delete. | |
2366 | * | |
2367 | * Users who want to delete empty subvols should try | |
2368 | * rmdir(2). | |
2369 | */ | |
2370 | err = -EPERM; | |
2371 | if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
2372 | goto out_dput; | |
2373 | ||
2374 | /* | |
2375 | * Do not allow deletion if the parent dir is the same | |
2376 | * as the dir to be deleted. That means the ioctl | |
2377 | * must be called on the dentry referencing the root | |
2378 | * of the subvol, not a random directory contained | |
2379 | * within it. | |
2380 | */ | |
2381 | err = -EINVAL; | |
2382 | if (root == dest) | |
2383 | goto out_dput; | |
2384 | ||
2385 | err = inode_permission(inode, MAY_WRITE | MAY_EXEC); | |
2386 | if (err) | |
2387 | goto out_dput; | |
4260f7c7 SW |
2388 | } |
2389 | ||
5c39da5b MX |
2390 | /* check if subvolume may be deleted by a user */ |
2391 | err = btrfs_may_delete(dir, dentry, 1); | |
2392 | if (err) | |
2393 | goto out_dput; | |
2394 | ||
33345d01 | 2395 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
76dda93c YZ |
2396 | err = -EINVAL; |
2397 | goto out_dput; | |
2398 | } | |
2399 | ||
76dda93c | 2400 | mutex_lock(&inode->i_mutex); |
521e0546 DS |
2401 | |
2402 | /* | |
2403 | * Don't allow to delete a subvolume with send in progress. This is | |
2404 | * inside the i_mutex so the error handling that has to drop the bit | |
2405 | * again is not run concurrently. | |
2406 | */ | |
2407 | spin_lock(&dest->root_item_lock); | |
c55bfa67 FM |
2408 | root_flags = btrfs_root_flags(&dest->root_item); |
2409 | if (dest->send_in_progress == 0) { | |
2410 | btrfs_set_root_flags(&dest->root_item, | |
521e0546 DS |
2411 | root_flags | BTRFS_ROOT_SUBVOL_DEAD); |
2412 | spin_unlock(&dest->root_item_lock); | |
2413 | } else { | |
2414 | spin_unlock(&dest->root_item_lock); | |
2415 | btrfs_warn(root->fs_info, | |
2416 | "Attempt to delete subvolume %llu during send", | |
c55bfa67 | 2417 | dest->root_key.objectid); |
521e0546 DS |
2418 | err = -EPERM; |
2419 | goto out_dput; | |
2420 | } | |
2421 | ||
5542aa2f | 2422 | d_invalidate(dentry); |
76dda93c YZ |
2423 | |
2424 | down_write(&root->fs_info->subvol_sem); | |
2425 | ||
2426 | err = may_destroy_subvol(dest); | |
2427 | if (err) | |
2428 | goto out_up_write; | |
2429 | ||
c58aaad2 MX |
2430 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
2431 | /* | |
2432 | * One for dir inode, two for dir entries, two for root | |
2433 | * ref/backref. | |
2434 | */ | |
2435 | err = btrfs_subvolume_reserve_metadata(root, &block_rsv, | |
ee3441b4 | 2436 | 5, &qgroup_reserved, true); |
c58aaad2 MX |
2437 | if (err) |
2438 | goto out_up_write; | |
2439 | ||
a22285a6 YZ |
2440 | trans = btrfs_start_transaction(root, 0); |
2441 | if (IS_ERR(trans)) { | |
2442 | err = PTR_ERR(trans); | |
c58aaad2 | 2443 | goto out_release; |
a22285a6 | 2444 | } |
c58aaad2 MX |
2445 | trans->block_rsv = &block_rsv; |
2446 | trans->bytes_reserved = block_rsv.size; | |
a22285a6 | 2447 | |
76dda93c YZ |
2448 | ret = btrfs_unlink_subvol(trans, root, dir, |
2449 | dest->root_key.objectid, | |
2450 | dentry->d_name.name, | |
2451 | dentry->d_name.len); | |
79787eaa JM |
2452 | if (ret) { |
2453 | err = ret; | |
2454 | btrfs_abort_transaction(trans, root, ret); | |
2455 | goto out_end_trans; | |
2456 | } | |
76dda93c YZ |
2457 | |
2458 | btrfs_record_root_in_trans(trans, dest); | |
2459 | ||
2460 | memset(&dest->root_item.drop_progress, 0, | |
2461 | sizeof(dest->root_item.drop_progress)); | |
2462 | dest->root_item.drop_level = 0; | |
2463 | btrfs_set_root_refs(&dest->root_item, 0); | |
2464 | ||
27cdeb70 | 2465 | if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) { |
d68fc57b YZ |
2466 | ret = btrfs_insert_orphan_item(trans, |
2467 | root->fs_info->tree_root, | |
2468 | dest->root_key.objectid); | |
79787eaa JM |
2469 | if (ret) { |
2470 | btrfs_abort_transaction(trans, root, ret); | |
2471 | err = ret; | |
2472 | goto out_end_trans; | |
2473 | } | |
d68fc57b | 2474 | } |
dd5f9615 SB |
2475 | |
2476 | ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, | |
2477 | dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, | |
2478 | dest->root_key.objectid); | |
2479 | if (ret && ret != -ENOENT) { | |
2480 | btrfs_abort_transaction(trans, root, ret); | |
2481 | err = ret; | |
2482 | goto out_end_trans; | |
2483 | } | |
2484 | if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { | |
2485 | ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, | |
2486 | dest->root_item.received_uuid, | |
2487 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
2488 | dest->root_key.objectid); | |
2489 | if (ret && ret != -ENOENT) { | |
2490 | btrfs_abort_transaction(trans, root, ret); | |
2491 | err = ret; | |
2492 | goto out_end_trans; | |
2493 | } | |
2494 | } | |
2495 | ||
79787eaa | 2496 | out_end_trans: |
c58aaad2 MX |
2497 | trans->block_rsv = NULL; |
2498 | trans->bytes_reserved = 0; | |
531cb13f | 2499 | ret = btrfs_end_transaction(trans, root); |
79787eaa JM |
2500 | if (ret && !err) |
2501 | err = ret; | |
76dda93c | 2502 | inode->i_flags |= S_DEAD; |
c58aaad2 MX |
2503 | out_release: |
2504 | btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); | |
76dda93c YZ |
2505 | out_up_write: |
2506 | up_write(&root->fs_info->subvol_sem); | |
521e0546 DS |
2507 | if (err) { |
2508 | spin_lock(&dest->root_item_lock); | |
c55bfa67 FM |
2509 | root_flags = btrfs_root_flags(&dest->root_item); |
2510 | btrfs_set_root_flags(&dest->root_item, | |
521e0546 DS |
2511 | root_flags & ~BTRFS_ROOT_SUBVOL_DEAD); |
2512 | spin_unlock(&dest->root_item_lock); | |
2513 | } | |
76dda93c YZ |
2514 | mutex_unlock(&inode->i_mutex); |
2515 | if (!err) { | |
efefb143 | 2516 | shrink_dcache_sb(root->fs_info->sb); |
76dda93c YZ |
2517 | btrfs_invalidate_inodes(dest); |
2518 | d_delete(dentry); | |
61155aa0 | 2519 | ASSERT(dest->send_in_progress == 0); |
fa6ac876 LB |
2520 | |
2521 | /* the last ref */ | |
57cdc8db DS |
2522 | if (dest->ino_cache_inode) { |
2523 | iput(dest->ino_cache_inode); | |
2524 | dest->ino_cache_inode = NULL; | |
fa6ac876 | 2525 | } |
76dda93c YZ |
2526 | } |
2527 | out_dput: | |
2528 | dput(dentry); | |
2529 | out_unlock_dir: | |
2530 | mutex_unlock(&dir->i_mutex); | |
e43f998e | 2531 | out_drop_write: |
2a79f17e | 2532 | mnt_drop_write_file(file); |
76dda93c YZ |
2533 | out: |
2534 | kfree(vol_args); | |
2535 | return err; | |
2536 | } | |
2537 | ||
1e701a32 | 2538 | static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
f46b5a66 | 2539 | { |
496ad9aa | 2540 | struct inode *inode = file_inode(file); |
f46b5a66 | 2541 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1e701a32 | 2542 | struct btrfs_ioctl_defrag_range_args *range; |
c146afad YZ |
2543 | int ret; |
2544 | ||
25122d15 ID |
2545 | ret = mnt_want_write_file(file); |
2546 | if (ret) | |
2547 | return ret; | |
b83cc969 | 2548 | |
25122d15 ID |
2549 | if (btrfs_root_readonly(root)) { |
2550 | ret = -EROFS; | |
2551 | goto out; | |
5ac00add | 2552 | } |
f46b5a66 CH |
2553 | |
2554 | switch (inode->i_mode & S_IFMT) { | |
2555 | case S_IFDIR: | |
e441d54d CM |
2556 | if (!capable(CAP_SYS_ADMIN)) { |
2557 | ret = -EPERM; | |
2558 | goto out; | |
2559 | } | |
de78b51a | 2560 | ret = btrfs_defrag_root(root); |
8929ecfa YZ |
2561 | if (ret) |
2562 | goto out; | |
de78b51a | 2563 | ret = btrfs_defrag_root(root->fs_info->extent_root); |
f46b5a66 CH |
2564 | break; |
2565 | case S_IFREG: | |
e441d54d CM |
2566 | if (!(file->f_mode & FMODE_WRITE)) { |
2567 | ret = -EINVAL; | |
2568 | goto out; | |
2569 | } | |
1e701a32 CM |
2570 | |
2571 | range = kzalloc(sizeof(*range), GFP_KERNEL); | |
2572 | if (!range) { | |
2573 | ret = -ENOMEM; | |
2574 | goto out; | |
2575 | } | |
2576 | ||
2577 | if (argp) { | |
2578 | if (copy_from_user(range, argp, | |
2579 | sizeof(*range))) { | |
2580 | ret = -EFAULT; | |
2581 | kfree(range); | |
683be16e | 2582 | goto out; |
1e701a32 CM |
2583 | } |
2584 | /* compression requires us to start the IO */ | |
2585 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
2586 | range->flags |= BTRFS_DEFRAG_RANGE_START_IO; | |
2587 | range->extent_thresh = (u32)-1; | |
2588 | } | |
2589 | } else { | |
2590 | /* the rest are all set to zero by kzalloc */ | |
2591 | range->len = (u64)-1; | |
2592 | } | |
496ad9aa | 2593 | ret = btrfs_defrag_file(file_inode(file), file, |
4cb5300b CM |
2594 | range, 0, 0); |
2595 | if (ret > 0) | |
2596 | ret = 0; | |
1e701a32 | 2597 | kfree(range); |
f46b5a66 | 2598 | break; |
8929ecfa YZ |
2599 | default: |
2600 | ret = -EINVAL; | |
f46b5a66 | 2601 | } |
e441d54d | 2602 | out: |
25122d15 | 2603 | mnt_drop_write_file(file); |
e441d54d | 2604 | return ret; |
f46b5a66 CH |
2605 | } |
2606 | ||
b2950863 | 2607 | static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
2608 | { |
2609 | struct btrfs_ioctl_vol_args *vol_args; | |
2610 | int ret; | |
2611 | ||
e441d54d CM |
2612 | if (!capable(CAP_SYS_ADMIN)) |
2613 | return -EPERM; | |
2614 | ||
5ac00add SB |
2615 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
2616 | 1)) { | |
e57138b3 | 2617 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
c9e9f97b ID |
2618 | } |
2619 | ||
5ac00add | 2620 | mutex_lock(&root->fs_info->volume_mutex); |
dae7b665 | 2621 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2622 | if (IS_ERR(vol_args)) { |
2623 | ret = PTR_ERR(vol_args); | |
2624 | goto out; | |
2625 | } | |
f46b5a66 | 2626 | |
5516e595 | 2627 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
2628 | ret = btrfs_init_new_device(root, vol_args->name); |
2629 | ||
43d20761 AJ |
2630 | if (!ret) |
2631 | btrfs_info(root->fs_info, "disk added %s",vol_args->name); | |
2632 | ||
f46b5a66 | 2633 | kfree(vol_args); |
c9e9f97b ID |
2634 | out: |
2635 | mutex_unlock(&root->fs_info->volume_mutex); | |
5ac00add | 2636 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
f46b5a66 CH |
2637 | return ret; |
2638 | } | |
2639 | ||
da24927b | 2640 | static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) |
f46b5a66 | 2641 | { |
496ad9aa | 2642 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
f46b5a66 CH |
2643 | struct btrfs_ioctl_vol_args *vol_args; |
2644 | int ret; | |
2645 | ||
e441d54d CM |
2646 | if (!capable(CAP_SYS_ADMIN)) |
2647 | return -EPERM; | |
2648 | ||
da24927b MX |
2649 | ret = mnt_want_write_file(file); |
2650 | if (ret) | |
2651 | return ret; | |
c146afad | 2652 | |
dae7b665 | 2653 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2654 | if (IS_ERR(vol_args)) { |
2655 | ret = PTR_ERR(vol_args); | |
c47ca32d | 2656 | goto err_drop; |
c9e9f97b | 2657 | } |
f46b5a66 | 2658 | |
5516e595 | 2659 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 | 2660 | |
183860f6 AJ |
2661 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
2662 | 1)) { | |
2663 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; | |
2664 | goto out; | |
2665 | } | |
2666 | ||
2667 | mutex_lock(&root->fs_info->volume_mutex); | |
2668 | ret = btrfs_rm_device(root, vol_args->name); | |
c9e9f97b | 2669 | mutex_unlock(&root->fs_info->volume_mutex); |
5ac00add | 2670 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
183860f6 | 2671 | |
ec95d491 AJ |
2672 | if (!ret) |
2673 | btrfs_info(root->fs_info, "disk deleted %s",vol_args->name); | |
2674 | ||
183860f6 AJ |
2675 | out: |
2676 | kfree(vol_args); | |
c47ca32d | 2677 | err_drop: |
4ac20c70 | 2678 | mnt_drop_write_file(file); |
f46b5a66 CH |
2679 | return ret; |
2680 | } | |
2681 | ||
475f6387 JS |
2682 | static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) |
2683 | { | |
027ed2f0 | 2684 | struct btrfs_ioctl_fs_info_args *fi_args; |
475f6387 JS |
2685 | struct btrfs_device *device; |
2686 | struct btrfs_device *next; | |
2687 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
027ed2f0 | 2688 | int ret = 0; |
475f6387 | 2689 | |
027ed2f0 LZ |
2690 | fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); |
2691 | if (!fi_args) | |
2692 | return -ENOMEM; | |
2693 | ||
f7171750 | 2694 | mutex_lock(&fs_devices->device_list_mutex); |
027ed2f0 LZ |
2695 | fi_args->num_devices = fs_devices->num_devices; |
2696 | memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); | |
475f6387 | 2697 | |
475f6387 | 2698 | list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { |
027ed2f0 LZ |
2699 | if (device->devid > fi_args->max_id) |
2700 | fi_args->max_id = device->devid; | |
475f6387 JS |
2701 | } |
2702 | mutex_unlock(&fs_devices->device_list_mutex); | |
2703 | ||
80a773fb DS |
2704 | fi_args->nodesize = root->fs_info->super_copy->nodesize; |
2705 | fi_args->sectorsize = root->fs_info->super_copy->sectorsize; | |
2706 | fi_args->clone_alignment = root->fs_info->super_copy->sectorsize; | |
2707 | ||
027ed2f0 LZ |
2708 | if (copy_to_user(arg, fi_args, sizeof(*fi_args))) |
2709 | ret = -EFAULT; | |
475f6387 | 2710 | |
027ed2f0 LZ |
2711 | kfree(fi_args); |
2712 | return ret; | |
475f6387 JS |
2713 | } |
2714 | ||
2715 | static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) | |
2716 | { | |
2717 | struct btrfs_ioctl_dev_info_args *di_args; | |
2718 | struct btrfs_device *dev; | |
2719 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
2720 | int ret = 0; | |
2721 | char *s_uuid = NULL; | |
475f6387 | 2722 | |
475f6387 JS |
2723 | di_args = memdup_user(arg, sizeof(*di_args)); |
2724 | if (IS_ERR(di_args)) | |
2725 | return PTR_ERR(di_args); | |
2726 | ||
dd5f9615 | 2727 | if (!btrfs_is_empty_uuid(di_args->uuid)) |
475f6387 JS |
2728 | s_uuid = di_args->uuid; |
2729 | ||
2730 | mutex_lock(&fs_devices->device_list_mutex); | |
aa1b8cd4 | 2731 | dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); |
475f6387 JS |
2732 | |
2733 | if (!dev) { | |
2734 | ret = -ENODEV; | |
2735 | goto out; | |
2736 | } | |
2737 | ||
2738 | di_args->devid = dev->devid; | |
7cc8e58d MX |
2739 | di_args->bytes_used = btrfs_device_get_bytes_used(dev); |
2740 | di_args->total_bytes = btrfs_device_get_total_bytes(dev); | |
475f6387 | 2741 | memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); |
a27202fb | 2742 | if (dev->name) { |
606686ee JB |
2743 | struct rcu_string *name; |
2744 | ||
2745 | rcu_read_lock(); | |
2746 | name = rcu_dereference(dev->name); | |
2747 | strncpy(di_args->path, name->str, sizeof(di_args->path)); | |
2748 | rcu_read_unlock(); | |
a27202fb JM |
2749 | di_args->path[sizeof(di_args->path) - 1] = 0; |
2750 | } else { | |
99ba55ad | 2751 | di_args->path[0] = '\0'; |
a27202fb | 2752 | } |
475f6387 JS |
2753 | |
2754 | out: | |
55793c0d | 2755 | mutex_unlock(&fs_devices->device_list_mutex); |
475f6387 JS |
2756 | if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) |
2757 | ret = -EFAULT; | |
2758 | ||
2759 | kfree(di_args); | |
2760 | return ret; | |
2761 | } | |
2762 | ||
416161db MF |
2763 | static struct page *extent_same_get_page(struct inode *inode, u64 off) |
2764 | { | |
2765 | struct page *page; | |
2766 | pgoff_t index; | |
2767 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2768 | ||
2769 | index = off >> PAGE_CACHE_SHIFT; | |
2770 | ||
2771 | page = grab_cache_page(inode->i_mapping, index); | |
2772 | if (!page) | |
2773 | return NULL; | |
2774 | ||
2775 | if (!PageUptodate(page)) { | |
2776 | if (extent_read_full_page_nolock(tree, page, btrfs_get_extent, | |
2777 | 0)) | |
2778 | return NULL; | |
2779 | lock_page(page); | |
2780 | if (!PageUptodate(page)) { | |
2781 | unlock_page(page); | |
2782 | page_cache_release(page); | |
2783 | return NULL; | |
2784 | } | |
2785 | } | |
2786 | unlock_page(page); | |
2787 | ||
2788 | return page; | |
2789 | } | |
2790 | ||
77fe20dc MF |
2791 | static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) |
2792 | { | |
2793 | /* do any pending delalloc/csum calc on src, one way or | |
2794 | another, and lock file content */ | |
2795 | while (1) { | |
2796 | struct btrfs_ordered_extent *ordered; | |
2797 | lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); | |
2798 | ordered = btrfs_lookup_first_ordered_extent(inode, | |
2799 | off + len - 1); | |
ff5df9b8 FM |
2800 | if ((!ordered || |
2801 | ordered->file_offset + ordered->len <= off || | |
2802 | ordered->file_offset >= off + len) && | |
77fe20dc | 2803 | !test_range_bit(&BTRFS_I(inode)->io_tree, off, |
ff5df9b8 FM |
2804 | off + len - 1, EXTENT_DELALLOC, 0, NULL)) { |
2805 | if (ordered) | |
2806 | btrfs_put_ordered_extent(ordered); | |
77fe20dc | 2807 | break; |
ff5df9b8 | 2808 | } |
77fe20dc MF |
2809 | unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); |
2810 | if (ordered) | |
2811 | btrfs_put_ordered_extent(ordered); | |
2812 | btrfs_wait_ordered_range(inode, off, len); | |
2813 | } | |
2814 | } | |
2815 | ||
416161db MF |
2816 | static void btrfs_double_unlock(struct inode *inode1, u64 loff1, |
2817 | struct inode *inode2, u64 loff2, u64 len) | |
2818 | { | |
2819 | unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); | |
2820 | unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); | |
2821 | ||
2822 | mutex_unlock(&inode1->i_mutex); | |
2823 | mutex_unlock(&inode2->i_mutex); | |
2824 | } | |
2825 | ||
2826 | static void btrfs_double_lock(struct inode *inode1, u64 loff1, | |
2827 | struct inode *inode2, u64 loff2, u64 len) | |
2828 | { | |
2829 | if (inode1 < inode2) { | |
2830 | swap(inode1, inode2); | |
2831 | swap(loff1, loff2); | |
2832 | } | |
2833 | ||
2834 | mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); | |
2835 | lock_extent_range(inode1, loff1, len); | |
2836 | if (inode1 != inode2) { | |
2837 | mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); | |
2838 | lock_extent_range(inode2, loff2, len); | |
2839 | } | |
2840 | } | |
2841 | ||
2842 | static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, | |
2843 | u64 dst_loff, u64 len) | |
2844 | { | |
2845 | int ret = 0; | |
2846 | struct page *src_page, *dst_page; | |
2847 | unsigned int cmp_len = PAGE_CACHE_SIZE; | |
2848 | void *addr, *dst_addr; | |
2849 | ||
2850 | while (len) { | |
2851 | if (len < PAGE_CACHE_SIZE) | |
2852 | cmp_len = len; | |
2853 | ||
2854 | src_page = extent_same_get_page(src, loff); | |
2855 | if (!src_page) | |
2856 | return -EINVAL; | |
2857 | dst_page = extent_same_get_page(dst, dst_loff); | |
2858 | if (!dst_page) { | |
2859 | page_cache_release(src_page); | |
2860 | return -EINVAL; | |
2861 | } | |
2862 | addr = kmap_atomic(src_page); | |
2863 | dst_addr = kmap_atomic(dst_page); | |
2864 | ||
2865 | flush_dcache_page(src_page); | |
2866 | flush_dcache_page(dst_page); | |
2867 | ||
2868 | if (memcmp(addr, dst_addr, cmp_len)) | |
2869 | ret = BTRFS_SAME_DATA_DIFFERS; | |
2870 | ||
2871 | kunmap_atomic(addr); | |
2872 | kunmap_atomic(dst_addr); | |
2873 | page_cache_release(src_page); | |
2874 | page_cache_release(dst_page); | |
2875 | ||
2876 | if (ret) | |
2877 | break; | |
2878 | ||
2879 | loff += cmp_len; | |
2880 | dst_loff += cmp_len; | |
2881 | len -= cmp_len; | |
2882 | } | |
2883 | ||
2884 | return ret; | |
2885 | } | |
2886 | ||
2887 | static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len) | |
2888 | { | |
2889 | u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; | |
2890 | ||
2891 | if (off + len > inode->i_size || off + len < off) | |
2892 | return -EINVAL; | |
2893 | /* Check that we are block aligned - btrfs_clone() requires this */ | |
2894 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) | |
2895 | return -EINVAL; | |
2896 | ||
2897 | return 0; | |
2898 | } | |
2899 | ||
2900 | static int btrfs_extent_same(struct inode *src, u64 loff, u64 len, | |
2901 | struct inode *dst, u64 dst_loff) | |
2902 | { | |
2903 | int ret; | |
2904 | ||
2905 | /* | |
2906 | * btrfs_clone() can't handle extents in the same file | |
2907 | * yet. Once that works, we can drop this check and replace it | |
2908 | * with a check for the same inode, but overlapping extents. | |
2909 | */ | |
2910 | if (src == dst) | |
2911 | return -EINVAL; | |
2912 | ||
2913 | btrfs_double_lock(src, loff, dst, dst_loff, len); | |
2914 | ||
2915 | ret = extent_same_check_offsets(src, loff, len); | |
2916 | if (ret) | |
2917 | goto out_unlock; | |
2918 | ||
2919 | ret = extent_same_check_offsets(dst, dst_loff, len); | |
2920 | if (ret) | |
2921 | goto out_unlock; | |
2922 | ||
2923 | /* don't make the dst file partly checksummed */ | |
2924 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != | |
2925 | (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { | |
2926 | ret = -EINVAL; | |
2927 | goto out_unlock; | |
2928 | } | |
2929 | ||
2930 | ret = btrfs_cmp_data(src, loff, dst, dst_loff, len); | |
2931 | if (ret == 0) | |
2932 | ret = btrfs_clone(src, dst, loff, len, len, dst_loff); | |
2933 | ||
2934 | out_unlock: | |
2935 | btrfs_double_unlock(src, loff, dst, dst_loff, len); | |
2936 | ||
2937 | return ret; | |
2938 | } | |
2939 | ||
2940 | #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) | |
2941 | ||
2942 | static long btrfs_ioctl_file_extent_same(struct file *file, | |
1c1c8747 | 2943 | struct btrfs_ioctl_same_args __user *argp) |
416161db | 2944 | { |
cbf8b8ca MF |
2945 | struct btrfs_ioctl_same_args *same; |
2946 | struct btrfs_ioctl_same_extent_info *info; | |
1c1c8747 | 2947 | struct inode *src = file_inode(file); |
416161db MF |
2948 | u64 off; |
2949 | u64 len; | |
2950 | int i; | |
2951 | int ret; | |
cbf8b8ca | 2952 | unsigned long size; |
416161db MF |
2953 | u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; |
2954 | bool is_admin = capable(CAP_SYS_ADMIN); | |
1c1c8747 | 2955 | u16 count; |
416161db MF |
2956 | |
2957 | if (!(file->f_mode & FMODE_READ)) | |
2958 | return -EINVAL; | |
2959 | ||
2960 | ret = mnt_want_write_file(file); | |
2961 | if (ret) | |
2962 | return ret; | |
2963 | ||
1c1c8747 | 2964 | if (get_user(count, &argp->dest_count)) { |
416161db MF |
2965 | ret = -EFAULT; |
2966 | goto out; | |
2967 | } | |
2968 | ||
1c1c8747 | 2969 | size = offsetof(struct btrfs_ioctl_same_args __user, info[count]); |
cbf8b8ca | 2970 | |
1c1c8747 | 2971 | same = memdup_user(argp, size); |
cbf8b8ca | 2972 | |
229eed43 GB |
2973 | if (IS_ERR(same)) { |
2974 | ret = PTR_ERR(same); | |
cbf8b8ca MF |
2975 | goto out; |
2976 | } | |
2977 | ||
2978 | off = same->logical_offset; | |
2979 | len = same->length; | |
416161db MF |
2980 | |
2981 | /* | |
2982 | * Limit the total length we will dedupe for each operation. | |
2983 | * This is intended to bound the total time spent in this | |
2984 | * ioctl to something sane. | |
2985 | */ | |
2986 | if (len > BTRFS_MAX_DEDUPE_LEN) | |
2987 | len = BTRFS_MAX_DEDUPE_LEN; | |
2988 | ||
2989 | if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { | |
2990 | /* | |
2991 | * Btrfs does not support blocksize < page_size. As a | |
2992 | * result, btrfs_cmp_data() won't correctly handle | |
2993 | * this situation without an update. | |
2994 | */ | |
2995 | ret = -EINVAL; | |
2996 | goto out; | |
2997 | } | |
2998 | ||
2999 | ret = -EISDIR; | |
3000 | if (S_ISDIR(src->i_mode)) | |
3001 | goto out; | |
3002 | ||
3003 | ret = -EACCES; | |
3004 | if (!S_ISREG(src->i_mode)) | |
3005 | goto out; | |
3006 | ||
cbf8b8ca | 3007 | /* pre-format output fields to sane values */ |
1c1c8747 | 3008 | for (i = 0; i < count; i++) { |
cbf8b8ca MF |
3009 | same->info[i].bytes_deduped = 0ULL; |
3010 | same->info[i].status = 0; | |
3011 | } | |
416161db | 3012 | |
1c1c8747 AV |
3013 | for (i = 0, info = same->info; i < count; i++, info++) { |
3014 | struct inode *dst; | |
3015 | struct fd dst_file = fdget(info->fd); | |
3016 | if (!dst_file.file) { | |
cbf8b8ca | 3017 | info->status = -EBADF; |
1c1c8747 | 3018 | continue; |
416161db | 3019 | } |
1c1c8747 | 3020 | dst = file_inode(dst_file.file); |
416161db | 3021 | |
1c1c8747 | 3022 | if (!(is_admin || (dst_file.file->f_mode & FMODE_WRITE))) { |
cbf8b8ca | 3023 | info->status = -EINVAL; |
1c1c8747 AV |
3024 | } else if (file->f_path.mnt != dst_file.file->f_path.mnt) { |
3025 | info->status = -EXDEV; | |
3026 | } else if (S_ISDIR(dst->i_mode)) { | |
cbf8b8ca | 3027 | info->status = -EISDIR; |
1c1c8747 | 3028 | } else if (!S_ISREG(dst->i_mode)) { |
cbf8b8ca | 3029 | info->status = -EACCES; |
1c1c8747 AV |
3030 | } else { |
3031 | info->status = btrfs_extent_same(src, off, len, dst, | |
3032 | info->logical_offset); | |
3033 | if (info->status == 0) | |
3034 | info->bytes_deduped += len; | |
416161db | 3035 | } |
1c1c8747 | 3036 | fdput(dst_file); |
416161db MF |
3037 | } |
3038 | ||
cbf8b8ca MF |
3039 | ret = copy_to_user(argp, same, size); |
3040 | if (ret) | |
3041 | ret = -EFAULT; | |
3042 | ||
416161db MF |
3043 | out: |
3044 | mnt_drop_write_file(file); | |
3045 | return ret; | |
3046 | } | |
3047 | ||
fcebe456 JB |
3048 | /* Helper to check and see if this root currently has a ref on the given disk |
3049 | * bytenr. If it does then we need to update the quota for this root. This | |
3050 | * doesn't do anything if quotas aren't enabled. | |
3051 | */ | |
3052 | static int check_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
3053 | u64 disko) | |
3054 | { | |
3055 | struct seq_list tree_mod_seq_elem = {}; | |
3056 | struct ulist *roots; | |
3057 | struct ulist_iterator uiter; | |
3058 | struct ulist_node *root_node = NULL; | |
3059 | int ret; | |
3060 | ||
3061 | if (!root->fs_info->quota_enabled) | |
3062 | return 1; | |
3063 | ||
3064 | btrfs_get_tree_mod_seq(root->fs_info, &tree_mod_seq_elem); | |
3065 | ret = btrfs_find_all_roots(trans, root->fs_info, disko, | |
3066 | tree_mod_seq_elem.seq, &roots); | |
3067 | if (ret < 0) | |
3068 | goto out; | |
3069 | ret = 0; | |
3070 | ULIST_ITER_INIT(&uiter); | |
3071 | while ((root_node = ulist_next(roots, &uiter))) { | |
3072 | if (root_node->val == root->objectid) { | |
3073 | ret = 1; | |
3074 | break; | |
3075 | } | |
3076 | } | |
3077 | ulist_free(roots); | |
3078 | out: | |
3079 | btrfs_put_tree_mod_seq(root->fs_info, &tree_mod_seq_elem); | |
3080 | return ret; | |
3081 | } | |
3082 | ||
f82a9901 FM |
3083 | static int clone_finish_inode_update(struct btrfs_trans_handle *trans, |
3084 | struct inode *inode, | |
3085 | u64 endoff, | |
3086 | const u64 destoff, | |
3087 | const u64 olen) | |
3088 | { | |
3089 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3090 | int ret; | |
3091 | ||
3092 | inode_inc_iversion(inode); | |
3093 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
3094 | /* | |
3095 | * We round up to the block size at eof when determining which | |
3096 | * extents to clone above, but shouldn't round up the file size. | |
3097 | */ | |
3098 | if (endoff > destoff + olen) | |
3099 | endoff = destoff + olen; | |
3100 | if (endoff > inode->i_size) | |
3101 | btrfs_i_size_write(inode, endoff); | |
3102 | ||
3103 | ret = btrfs_update_inode(trans, root, inode); | |
3104 | if (ret) { | |
3105 | btrfs_abort_transaction(trans, root, ret); | |
3106 | btrfs_end_transaction(trans, root); | |
3107 | goto out; | |
3108 | } | |
3109 | ret = btrfs_end_transaction(trans, root); | |
3110 | out: | |
3111 | return ret; | |
3112 | } | |
3113 | ||
7ffbb598 FM |
3114 | static void clone_update_extent_map(struct inode *inode, |
3115 | const struct btrfs_trans_handle *trans, | |
3116 | const struct btrfs_path *path, | |
7ffbb598 FM |
3117 | const u64 hole_offset, |
3118 | const u64 hole_len) | |
3119 | { | |
3120 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
3121 | struct extent_map *em; | |
3122 | int ret; | |
3123 | ||
3124 | em = alloc_extent_map(); | |
3125 | if (!em) { | |
3126 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
3127 | &BTRFS_I(inode)->runtime_flags); | |
3128 | return; | |
3129 | } | |
3130 | ||
14f59796 FM |
3131 | if (path) { |
3132 | struct btrfs_file_extent_item *fi; | |
3133 | ||
3134 | fi = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3135 | struct btrfs_file_extent_item); | |
7ffbb598 FM |
3136 | btrfs_extent_item_to_extent_map(inode, path, fi, false, em); |
3137 | em->generation = -1; | |
3138 | if (btrfs_file_extent_type(path->nodes[0], fi) == | |
3139 | BTRFS_FILE_EXTENT_INLINE) | |
3140 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
3141 | &BTRFS_I(inode)->runtime_flags); | |
3142 | } else { | |
3143 | em->start = hole_offset; | |
3144 | em->len = hole_len; | |
3145 | em->ram_bytes = em->len; | |
3146 | em->orig_start = hole_offset; | |
3147 | em->block_start = EXTENT_MAP_HOLE; | |
3148 | em->block_len = 0; | |
3149 | em->orig_block_len = 0; | |
3150 | em->compress_type = BTRFS_COMPRESS_NONE; | |
3151 | em->generation = trans->transid; | |
3152 | } | |
3153 | ||
3154 | while (1) { | |
3155 | write_lock(&em_tree->lock); | |
3156 | ret = add_extent_mapping(em_tree, em, 1); | |
3157 | write_unlock(&em_tree->lock); | |
3158 | if (ret != -EEXIST) { | |
3159 | free_extent_map(em); | |
3160 | break; | |
3161 | } | |
3162 | btrfs_drop_extent_cache(inode, em->start, | |
3163 | em->start + em->len - 1, 0); | |
3164 | } | |
3165 | ||
ee39b432 | 3166 | if (ret) |
7ffbb598 FM |
3167 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
3168 | &BTRFS_I(inode)->runtime_flags); | |
3169 | } | |
3170 | ||
32b7c687 MF |
3171 | /** |
3172 | * btrfs_clone() - clone a range from inode file to another | |
3173 | * | |
3174 | * @src: Inode to clone from | |
3175 | * @inode: Inode to clone to | |
3176 | * @off: Offset within source to start clone from | |
3177 | * @olen: Original length, passed by user, of range to clone | |
3178 | * @olen_aligned: Block-aligned value of olen, extent_same uses | |
3179 | * identical values here | |
3180 | * @destoff: Offset within @inode to start clone | |
3181 | */ | |
3182 | static int btrfs_clone(struct inode *src, struct inode *inode, | |
f82a9901 FM |
3183 | const u64 off, const u64 olen, const u64 olen_aligned, |
3184 | const u64 destoff) | |
f46b5a66 | 3185 | { |
f46b5a66 | 3186 | struct btrfs_root *root = BTRFS_I(inode)->root; |
32b7c687 | 3187 | struct btrfs_path *path = NULL; |
f46b5a66 | 3188 | struct extent_buffer *leaf; |
32b7c687 MF |
3189 | struct btrfs_trans_handle *trans; |
3190 | char *buf = NULL; | |
ae01a0ab | 3191 | struct btrfs_key key; |
f46b5a66 CH |
3192 | u32 nritems; |
3193 | int slot; | |
ae01a0ab | 3194 | int ret; |
fcebe456 | 3195 | int no_quota; |
f82a9901 | 3196 | const u64 len = olen_aligned; |
fcebe456 | 3197 | u64 last_disko = 0; |
f82a9901 | 3198 | u64 last_dest_end = destoff; |
ae01a0ab YZ |
3199 | |
3200 | ret = -ENOMEM; | |
707e8a07 | 3201 | buf = vmalloc(root->nodesize); |
ae01a0ab | 3202 | if (!buf) |
32b7c687 | 3203 | return ret; |
ae01a0ab YZ |
3204 | |
3205 | path = btrfs_alloc_path(); | |
3206 | if (!path) { | |
3207 | vfree(buf); | |
32b7c687 | 3208 | return ret; |
d525e8ab LZ |
3209 | } |
3210 | ||
32b7c687 | 3211 | path->reada = 2; |
c5c9cd4d | 3212 | /* clone data */ |
33345d01 | 3213 | key.objectid = btrfs_ino(src); |
ae01a0ab | 3214 | key.type = BTRFS_EXTENT_DATA_KEY; |
2c463823 | 3215 | key.offset = off; |
f46b5a66 CH |
3216 | |
3217 | while (1) { | |
3218 | /* | |
3219 | * note the key will change type as we walk through the | |
3220 | * tree. | |
3221 | */ | |
e4355f34 | 3222 | path->leave_spinning = 1; |
362a20c5 DS |
3223 | ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, |
3224 | 0, 0); | |
f46b5a66 CH |
3225 | if (ret < 0) |
3226 | goto out; | |
2c463823 FM |
3227 | /* |
3228 | * First search, if no extent item that starts at offset off was | |
3229 | * found but the previous item is an extent item, it's possible | |
3230 | * it might overlap our target range, therefore process it. | |
3231 | */ | |
3232 | if (key.offset == off && ret > 0 && path->slots[0] > 0) { | |
3233 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
3234 | path->slots[0] - 1); | |
3235 | if (key.type == BTRFS_EXTENT_DATA_KEY) | |
3236 | path->slots[0]--; | |
3237 | } | |
f46b5a66 | 3238 | |
ae01a0ab | 3239 | nritems = btrfs_header_nritems(path->nodes[0]); |
e4355f34 | 3240 | process_slot: |
fcebe456 | 3241 | no_quota = 1; |
ae01a0ab | 3242 | if (path->slots[0] >= nritems) { |
362a20c5 | 3243 | ret = btrfs_next_leaf(BTRFS_I(src)->root, path); |
f46b5a66 CH |
3244 | if (ret < 0) |
3245 | goto out; | |
3246 | if (ret > 0) | |
3247 | break; | |
ae01a0ab | 3248 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
3249 | } |
3250 | leaf = path->nodes[0]; | |
3251 | slot = path->slots[0]; | |
f46b5a66 | 3252 | |
ae01a0ab | 3253 | btrfs_item_key_to_cpu(leaf, &key, slot); |
962a298f | 3254 | if (key.type > BTRFS_EXTENT_DATA_KEY || |
33345d01 | 3255 | key.objectid != btrfs_ino(src)) |
f46b5a66 CH |
3256 | break; |
3257 | ||
962a298f | 3258 | if (key.type == BTRFS_EXTENT_DATA_KEY) { |
c5c9cd4d SW |
3259 | struct btrfs_file_extent_item *extent; |
3260 | int type; | |
31840ae1 ZY |
3261 | u32 size; |
3262 | struct btrfs_key new_key; | |
c5c9cd4d SW |
3263 | u64 disko = 0, diskl = 0; |
3264 | u64 datao = 0, datal = 0; | |
3265 | u8 comp; | |
f82a9901 | 3266 | u64 drop_start; |
31840ae1 | 3267 | |
c5c9cd4d SW |
3268 | extent = btrfs_item_ptr(leaf, slot, |
3269 | struct btrfs_file_extent_item); | |
3270 | comp = btrfs_file_extent_compression(leaf, extent); | |
3271 | type = btrfs_file_extent_type(leaf, extent); | |
c8a894d7 CM |
3272 | if (type == BTRFS_FILE_EXTENT_REG || |
3273 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d397712b CM |
3274 | disko = btrfs_file_extent_disk_bytenr(leaf, |
3275 | extent); | |
3276 | diskl = btrfs_file_extent_disk_num_bytes(leaf, | |
3277 | extent); | |
c5c9cd4d | 3278 | datao = btrfs_file_extent_offset(leaf, extent); |
d397712b CM |
3279 | datal = btrfs_file_extent_num_bytes(leaf, |
3280 | extent); | |
c5c9cd4d SW |
3281 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
3282 | /* take upper bound, may be compressed */ | |
3283 | datal = btrfs_file_extent_ram_bytes(leaf, | |
3284 | extent); | |
3285 | } | |
31840ae1 | 3286 | |
2c463823 FM |
3287 | /* |
3288 | * The first search might have left us at an extent | |
3289 | * item that ends before our target range's start, can | |
3290 | * happen if we have holes and NO_HOLES feature enabled. | |
3291 | */ | |
3292 | if (key.offset + datal <= off) { | |
e4355f34 FDBM |
3293 | path->slots[0]++; |
3294 | goto process_slot; | |
2c463823 FM |
3295 | } else if (key.offset >= off + len) { |
3296 | break; | |
e4355f34 FDBM |
3297 | } |
3298 | ||
3299 | size = btrfs_item_size_nr(leaf, slot); | |
3300 | read_extent_buffer(leaf, buf, | |
3301 | btrfs_item_ptr_offset(leaf, slot), | |
3302 | size); | |
3303 | ||
3304 | btrfs_release_path(path); | |
3305 | path->leave_spinning = 0; | |
c5c9cd4d | 3306 | |
31840ae1 | 3307 | memcpy(&new_key, &key, sizeof(new_key)); |
33345d01 | 3308 | new_key.objectid = btrfs_ino(inode); |
4d728ec7 LZ |
3309 | if (off <= key.offset) |
3310 | new_key.offset = key.offset + destoff - off; | |
3311 | else | |
3312 | new_key.offset = destoff; | |
31840ae1 | 3313 | |
f82a9901 FM |
3314 | /* |
3315 | * Deal with a hole that doesn't have an extent item | |
3316 | * that represents it (NO_HOLES feature enabled). | |
3317 | * This hole is either in the middle of the cloning | |
3318 | * range or at the beginning (fully overlaps it or | |
3319 | * partially overlaps it). | |
3320 | */ | |
3321 | if (new_key.offset != last_dest_end) | |
3322 | drop_start = last_dest_end; | |
3323 | else | |
3324 | drop_start = new_key.offset; | |
3325 | ||
b6f3409b SW |
3326 | /* |
3327 | * 1 - adjusting old extent (we may have to split it) | |
3328 | * 1 - add new extent | |
3329 | * 1 - inode update | |
3330 | */ | |
3331 | trans = btrfs_start_transaction(root, 3); | |
a22285a6 YZ |
3332 | if (IS_ERR(trans)) { |
3333 | ret = PTR_ERR(trans); | |
3334 | goto out; | |
3335 | } | |
3336 | ||
c8a894d7 CM |
3337 | if (type == BTRFS_FILE_EXTENT_REG || |
3338 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d72c0842 LZ |
3339 | /* |
3340 | * a | --- range to clone ---| b | |
3341 | * | ------------- extent ------------- | | |
3342 | */ | |
3343 | ||
93915584 | 3344 | /* subtract range b */ |
d72c0842 LZ |
3345 | if (key.offset + datal > off + len) |
3346 | datal = off + len - key.offset; | |
3347 | ||
93915584 | 3348 | /* subtract range a */ |
a22285a6 YZ |
3349 | if (off > key.offset) { |
3350 | datao += off - key.offset; | |
3351 | datal -= off - key.offset; | |
3352 | } | |
3353 | ||
5dc562c5 | 3354 | ret = btrfs_drop_extents(trans, root, inode, |
f82a9901 | 3355 | drop_start, |
a22285a6 | 3356 | new_key.offset + datal, |
2671485d | 3357 | 1); |
79787eaa | 3358 | if (ret) { |
3f9e3df8 | 3359 | if (ret != -EOPNOTSUPP) |
00fdf13a LB |
3360 | btrfs_abort_transaction(trans, |
3361 | root, ret); | |
79787eaa JM |
3362 | btrfs_end_transaction(trans, root); |
3363 | goto out; | |
3364 | } | |
a22285a6 | 3365 | |
c5c9cd4d SW |
3366 | ret = btrfs_insert_empty_item(trans, root, path, |
3367 | &new_key, size); | |
79787eaa JM |
3368 | if (ret) { |
3369 | btrfs_abort_transaction(trans, root, | |
3370 | ret); | |
3371 | btrfs_end_transaction(trans, root); | |
3372 | goto out; | |
3373 | } | |
c5c9cd4d SW |
3374 | |
3375 | leaf = path->nodes[0]; | |
3376 | slot = path->slots[0]; | |
3377 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
3378 | btrfs_item_ptr_offset(leaf, slot), |
3379 | size); | |
ae01a0ab | 3380 | |
c5c9cd4d | 3381 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 3382 | struct btrfs_file_extent_item); |
c5c9cd4d | 3383 | |
c5c9cd4d SW |
3384 | /* disko == 0 means it's a hole */ |
3385 | if (!disko) | |
3386 | datao = 0; | |
c5c9cd4d SW |
3387 | |
3388 | btrfs_set_file_extent_offset(leaf, extent, | |
3389 | datao); | |
3390 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
3391 | datal); | |
fcebe456 JB |
3392 | |
3393 | /* | |
3394 | * We need to look up the roots that point at | |
3395 | * this bytenr and see if the new root does. If | |
3396 | * it does not we need to make sure we update | |
3397 | * quotas appropriately. | |
3398 | */ | |
3399 | if (disko && root != BTRFS_I(src)->root && | |
3400 | disko != last_disko) { | |
3401 | no_quota = check_ref(trans, root, | |
3402 | disko); | |
3403 | if (no_quota < 0) { | |
3404 | btrfs_abort_transaction(trans, | |
3405 | root, | |
3406 | ret); | |
3407 | btrfs_end_transaction(trans, | |
3408 | root); | |
3409 | ret = no_quota; | |
3410 | goto out; | |
3411 | } | |
3412 | } | |
3413 | ||
c5c9cd4d SW |
3414 | if (disko) { |
3415 | inode_add_bytes(inode, datal); | |
ae01a0ab | 3416 | ret = btrfs_inc_extent_ref(trans, root, |
5d4f98a2 YZ |
3417 | disko, diskl, 0, |
3418 | root->root_key.objectid, | |
33345d01 | 3419 | btrfs_ino(inode), |
66d7e7f0 | 3420 | new_key.offset - datao, |
fcebe456 | 3421 | no_quota); |
79787eaa JM |
3422 | if (ret) { |
3423 | btrfs_abort_transaction(trans, | |
3424 | root, | |
3425 | ret); | |
3426 | btrfs_end_transaction(trans, | |
3427 | root); | |
3428 | goto out; | |
3429 | ||
3430 | } | |
f46b5a66 | 3431 | } |
c5c9cd4d SW |
3432 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
3433 | u64 skip = 0; | |
3434 | u64 trim = 0; | |
d3ecfcdf LB |
3435 | u64 aligned_end = 0; |
3436 | ||
c5c9cd4d SW |
3437 | if (off > key.offset) { |
3438 | skip = off - key.offset; | |
3439 | new_key.offset += skip; | |
3440 | } | |
d397712b | 3441 | |
aa42ffd9 LB |
3442 | if (key.offset + datal > off + len) |
3443 | trim = key.offset + datal - (off + len); | |
d397712b | 3444 | |
c5c9cd4d | 3445 | if (comp && (skip || trim)) { |
c5c9cd4d | 3446 | ret = -EINVAL; |
a22285a6 | 3447 | btrfs_end_transaction(trans, root); |
c5c9cd4d SW |
3448 | goto out; |
3449 | } | |
3450 | size -= skip + trim; | |
3451 | datal -= skip + trim; | |
a22285a6 | 3452 | |
d3ecfcdf LB |
3453 | aligned_end = ALIGN(new_key.offset + datal, |
3454 | root->sectorsize); | |
5dc562c5 | 3455 | ret = btrfs_drop_extents(trans, root, inode, |
f82a9901 | 3456 | drop_start, |
d3ecfcdf | 3457 | aligned_end, |
2671485d | 3458 | 1); |
79787eaa | 3459 | if (ret) { |
3f9e3df8 | 3460 | if (ret != -EOPNOTSUPP) |
3a29bc09 CM |
3461 | btrfs_abort_transaction(trans, |
3462 | root, ret); | |
79787eaa JM |
3463 | btrfs_end_transaction(trans, root); |
3464 | goto out; | |
3465 | } | |
a22285a6 | 3466 | |
c5c9cd4d SW |
3467 | ret = btrfs_insert_empty_item(trans, root, path, |
3468 | &new_key, size); | |
79787eaa JM |
3469 | if (ret) { |
3470 | btrfs_abort_transaction(trans, root, | |
3471 | ret); | |
3472 | btrfs_end_transaction(trans, root); | |
3473 | goto out; | |
3474 | } | |
c5c9cd4d SW |
3475 | |
3476 | if (skip) { | |
d397712b CM |
3477 | u32 start = |
3478 | btrfs_file_extent_calc_inline_size(0); | |
c5c9cd4d SW |
3479 | memmove(buf+start, buf+start+skip, |
3480 | datal); | |
3481 | } | |
3482 | ||
3483 | leaf = path->nodes[0]; | |
3484 | slot = path->slots[0]; | |
3485 | write_extent_buffer(leaf, buf, | |
3486 | btrfs_item_ptr_offset(leaf, slot), | |
3487 | size); | |
3488 | inode_add_bytes(inode, datal); | |
f46b5a66 | 3489 | } |
c5c9cd4d | 3490 | |
7ffbb598 FM |
3491 | /* If we have an implicit hole (NO_HOLES feature). */ |
3492 | if (drop_start < new_key.offset) | |
3493 | clone_update_extent_map(inode, trans, | |
14f59796 | 3494 | NULL, drop_start, |
7ffbb598 FM |
3495 | new_key.offset - drop_start); |
3496 | ||
14f59796 | 3497 | clone_update_extent_map(inode, trans, path, 0, 0); |
7ffbb598 | 3498 | |
c5c9cd4d | 3499 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 3500 | btrfs_release_path(path); |
c5c9cd4d | 3501 | |
62e2390e FM |
3502 | last_dest_end = ALIGN(new_key.offset + datal, |
3503 | root->sectorsize); | |
f82a9901 FM |
3504 | ret = clone_finish_inode_update(trans, inode, |
3505 | last_dest_end, | |
3506 | destoff, olen); | |
3507 | if (ret) | |
79787eaa | 3508 | goto out; |
2c463823 FM |
3509 | if (new_key.offset + datal >= destoff + len) |
3510 | break; | |
a22285a6 | 3511 | } |
b3b4aa74 | 3512 | btrfs_release_path(path); |
f46b5a66 | 3513 | key.offset++; |
f46b5a66 | 3514 | } |
f46b5a66 | 3515 | ret = 0; |
32b7c687 | 3516 | |
f82a9901 FM |
3517 | if (last_dest_end < destoff + len) { |
3518 | /* | |
3519 | * We have an implicit hole (NO_HOLES feature is enabled) that | |
3520 | * fully or partially overlaps our cloning range at its end. | |
3521 | */ | |
3522 | btrfs_release_path(path); | |
3523 | ||
3524 | /* | |
3525 | * 1 - remove extent(s) | |
3526 | * 1 - inode update | |
3527 | */ | |
3528 | trans = btrfs_start_transaction(root, 2); | |
3529 | if (IS_ERR(trans)) { | |
3530 | ret = PTR_ERR(trans); | |
3531 | goto out; | |
3532 | } | |
3533 | ret = btrfs_drop_extents(trans, root, inode, | |
3534 | last_dest_end, destoff + len, 1); | |
3535 | if (ret) { | |
3536 | if (ret != -EOPNOTSUPP) | |
3537 | btrfs_abort_transaction(trans, root, ret); | |
3538 | btrfs_end_transaction(trans, root); | |
3539 | goto out; | |
3540 | } | |
14f59796 FM |
3541 | clone_update_extent_map(inode, trans, NULL, last_dest_end, |
3542 | destoff + len - last_dest_end); | |
f82a9901 FM |
3543 | ret = clone_finish_inode_update(trans, inode, destoff + len, |
3544 | destoff, olen); | |
3545 | } | |
3546 | ||
f46b5a66 | 3547 | out: |
32b7c687 MF |
3548 | btrfs_free_path(path); |
3549 | vfree(buf); | |
3550 | return ret; | |
3551 | } | |
3552 | ||
3553 | static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, | |
3554 | u64 off, u64 olen, u64 destoff) | |
3555 | { | |
54563d41 | 3556 | struct inode *inode = file_inode(file); |
32b7c687 MF |
3557 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3558 | struct fd src_file; | |
3559 | struct inode *src; | |
3560 | int ret; | |
3561 | u64 len = olen; | |
3562 | u64 bs = root->fs_info->sb->s_blocksize; | |
3563 | int same_inode = 0; | |
3564 | ||
3565 | /* | |
3566 | * TODO: | |
3567 | * - split compressed inline extents. annoying: we need to | |
3568 | * decompress into destination's address_space (the file offset | |
3569 | * may change, so source mapping won't do), then recompress (or | |
3570 | * otherwise reinsert) a subrange. | |
00fdf13a LB |
3571 | * |
3572 | * - split destination inode's inline extents. The inline extents can | |
3573 | * be either compressed or non-compressed. | |
32b7c687 MF |
3574 | */ |
3575 | ||
3576 | /* the destination must be opened for writing */ | |
3577 | if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) | |
3578 | return -EINVAL; | |
3579 | ||
3580 | if (btrfs_root_readonly(root)) | |
3581 | return -EROFS; | |
3582 | ||
3583 | ret = mnt_want_write_file(file); | |
3584 | if (ret) | |
3585 | return ret; | |
3586 | ||
3587 | src_file = fdget(srcfd); | |
3588 | if (!src_file.file) { | |
3589 | ret = -EBADF; | |
3590 | goto out_drop_write; | |
3591 | } | |
3592 | ||
3593 | ret = -EXDEV; | |
3594 | if (src_file.file->f_path.mnt != file->f_path.mnt) | |
3595 | goto out_fput; | |
3596 | ||
3597 | src = file_inode(src_file.file); | |
3598 | ||
3599 | ret = -EINVAL; | |
3600 | if (src == inode) | |
3601 | same_inode = 1; | |
3602 | ||
3603 | /* the src must be open for reading */ | |
3604 | if (!(src_file.file->f_mode & FMODE_READ)) | |
3605 | goto out_fput; | |
3606 | ||
3607 | /* don't make the dst file partly checksummed */ | |
3608 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != | |
3609 | (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) | |
3610 | goto out_fput; | |
3611 | ||
3612 | ret = -EISDIR; | |
3613 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) | |
3614 | goto out_fput; | |
3615 | ||
3616 | ret = -EXDEV; | |
3617 | if (src->i_sb != inode->i_sb) | |
3618 | goto out_fput; | |
3619 | ||
3620 | if (!same_inode) { | |
3621 | if (inode < src) { | |
3622 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); | |
3623 | mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); | |
3624 | } else { | |
3625 | mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); | |
3626 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); | |
3627 | } | |
3628 | } else { | |
3629 | mutex_lock(&src->i_mutex); | |
3630 | } | |
3631 | ||
3632 | /* determine range to clone */ | |
3633 | ret = -EINVAL; | |
3634 | if (off + len > src->i_size || off + len < off) | |
3635 | goto out_unlock; | |
3636 | if (len == 0) | |
3637 | olen = len = src->i_size - off; | |
3638 | /* if we extend to eof, continue to block boundary */ | |
3639 | if (off + len == src->i_size) | |
3640 | len = ALIGN(src->i_size, bs) - off; | |
3641 | ||
3642 | /* verify the end result is block aligned */ | |
3643 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || | |
3644 | !IS_ALIGNED(destoff, bs)) | |
3645 | goto out_unlock; | |
3646 | ||
3647 | /* verify if ranges are overlapped within the same file */ | |
3648 | if (same_inode) { | |
3649 | if (destoff + len > off && destoff < off + len) | |
3650 | goto out_unlock; | |
3651 | } | |
3652 | ||
3653 | if (destoff > inode->i_size) { | |
3654 | ret = btrfs_cont_expand(inode, inode->i_size, destoff); | |
3655 | if (ret) | |
3656 | goto out_unlock; | |
3657 | } | |
3658 | ||
c125b8bf FM |
3659 | /* |
3660 | * Lock the target range too. Right after we replace the file extent | |
3661 | * items in the fs tree (which now point to the cloned data), we might | |
3662 | * have a worker replace them with extent items relative to a write | |
3663 | * operation that was issued before this clone operation (i.e. confront | |
3664 | * with inode.c:btrfs_finish_ordered_io). | |
3665 | */ | |
3666 | if (same_inode) { | |
3667 | u64 lock_start = min_t(u64, off, destoff); | |
3668 | u64 lock_len = max_t(u64, off, destoff) + len - lock_start; | |
32b7c687 | 3669 | |
c125b8bf FM |
3670 | lock_extent_range(src, lock_start, lock_len); |
3671 | } else { | |
3672 | lock_extent_range(src, off, len); | |
3673 | lock_extent_range(inode, destoff, len); | |
3674 | } | |
32b7c687 MF |
3675 | |
3676 | ret = btrfs_clone(src, inode, off, olen, len, destoff); | |
3677 | ||
c125b8bf FM |
3678 | if (same_inode) { |
3679 | u64 lock_start = min_t(u64, off, destoff); | |
3680 | u64 lock_end = max_t(u64, off, destoff) + len - 1; | |
3681 | ||
3682 | unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end); | |
3683 | } else { | |
3684 | unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); | |
3685 | unlock_extent(&BTRFS_I(inode)->io_tree, destoff, | |
3686 | destoff + len - 1); | |
3687 | } | |
3688 | /* | |
3689 | * Truncate page cache pages so that future reads will see the cloned | |
3690 | * data immediately and not the previous data. | |
3691 | */ | |
3692 | truncate_inode_pages_range(&inode->i_data, destoff, | |
3693 | PAGE_CACHE_ALIGN(destoff + len) - 1); | |
f46b5a66 | 3694 | out_unlock: |
c57c2b3e FDBM |
3695 | if (!same_inode) { |
3696 | if (inode < src) { | |
3697 | mutex_unlock(&src->i_mutex); | |
3698 | mutex_unlock(&inode->i_mutex); | |
3699 | } else { | |
3700 | mutex_unlock(&inode->i_mutex); | |
3701 | mutex_unlock(&src->i_mutex); | |
3702 | } | |
3703 | } else { | |
3704 | mutex_unlock(&src->i_mutex); | |
3705 | } | |
f46b5a66 | 3706 | out_fput: |
2903ff01 | 3707 | fdput(src_file); |
ab67b7c1 | 3708 | out_drop_write: |
2a79f17e | 3709 | mnt_drop_write_file(file); |
f46b5a66 CH |
3710 | return ret; |
3711 | } | |
3712 | ||
7a865e8a | 3713 | static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) |
c5c9cd4d SW |
3714 | { |
3715 | struct btrfs_ioctl_clone_range_args args; | |
3716 | ||
7a865e8a | 3717 | if (copy_from_user(&args, argp, sizeof(args))) |
c5c9cd4d SW |
3718 | return -EFAULT; |
3719 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, | |
3720 | args.src_length, args.dest_offset); | |
3721 | } | |
3722 | ||
f46b5a66 CH |
3723 | /* |
3724 | * there are many ways the trans_start and trans_end ioctls can lead | |
3725 | * to deadlocks. They should only be used by applications that | |
3726 | * basically own the machine, and have a very in depth understanding | |
3727 | * of all the possible deadlocks and enospc problems. | |
3728 | */ | |
b2950863 | 3729 | static long btrfs_ioctl_trans_start(struct file *file) |
f46b5a66 | 3730 | { |
496ad9aa | 3731 | struct inode *inode = file_inode(file); |
f46b5a66 CH |
3732 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3733 | struct btrfs_trans_handle *trans; | |
1ab86aed | 3734 | int ret; |
f46b5a66 | 3735 | |
1ab86aed | 3736 | ret = -EPERM; |
df5b5520 | 3737 | if (!capable(CAP_SYS_ADMIN)) |
1ab86aed | 3738 | goto out; |
df5b5520 | 3739 | |
1ab86aed SW |
3740 | ret = -EINPROGRESS; |
3741 | if (file->private_data) | |
f46b5a66 | 3742 | goto out; |
9ca9ee09 | 3743 | |
b83cc969 LZ |
3744 | ret = -EROFS; |
3745 | if (btrfs_root_readonly(root)) | |
3746 | goto out; | |
3747 | ||
a561be71 | 3748 | ret = mnt_want_write_file(file); |
c146afad YZ |
3749 | if (ret) |
3750 | goto out; | |
3751 | ||
a4abeea4 | 3752 | atomic_inc(&root->fs_info->open_ioctl_trans); |
9ca9ee09 | 3753 | |
1ab86aed | 3754 | ret = -ENOMEM; |
7a7eaa40 | 3755 | trans = btrfs_start_ioctl_transaction(root); |
abd30bb0 | 3756 | if (IS_ERR(trans)) |
1ab86aed SW |
3757 | goto out_drop; |
3758 | ||
3759 | file->private_data = trans; | |
3760 | return 0; | |
3761 | ||
3762 | out_drop: | |
a4abeea4 | 3763 | atomic_dec(&root->fs_info->open_ioctl_trans); |
2a79f17e | 3764 | mnt_drop_write_file(file); |
f46b5a66 | 3765 | out: |
f46b5a66 CH |
3766 | return ret; |
3767 | } | |
3768 | ||
6ef5ed0d JB |
3769 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
3770 | { | |
496ad9aa | 3771 | struct inode *inode = file_inode(file); |
6ef5ed0d JB |
3772 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3773 | struct btrfs_root *new_root; | |
3774 | struct btrfs_dir_item *di; | |
3775 | struct btrfs_trans_handle *trans; | |
3776 | struct btrfs_path *path; | |
3777 | struct btrfs_key location; | |
3778 | struct btrfs_disk_key disk_key; | |
6ef5ed0d JB |
3779 | u64 objectid = 0; |
3780 | u64 dir_id; | |
3c04ce01 | 3781 | int ret; |
6ef5ed0d JB |
3782 | |
3783 | if (!capable(CAP_SYS_ADMIN)) | |
3784 | return -EPERM; | |
3785 | ||
3c04ce01 MX |
3786 | ret = mnt_want_write_file(file); |
3787 | if (ret) | |
3788 | return ret; | |
3789 | ||
3790 | if (copy_from_user(&objectid, argp, sizeof(objectid))) { | |
3791 | ret = -EFAULT; | |
3792 | goto out; | |
3793 | } | |
6ef5ed0d JB |
3794 | |
3795 | if (!objectid) | |
1cecf579 | 3796 | objectid = BTRFS_FS_TREE_OBJECTID; |
6ef5ed0d JB |
3797 | |
3798 | location.objectid = objectid; | |
3799 | location.type = BTRFS_ROOT_ITEM_KEY; | |
3800 | location.offset = (u64)-1; | |
3801 | ||
3802 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
3c04ce01 MX |
3803 | if (IS_ERR(new_root)) { |
3804 | ret = PTR_ERR(new_root); | |
3805 | goto out; | |
3806 | } | |
6ef5ed0d | 3807 | |
6ef5ed0d | 3808 | path = btrfs_alloc_path(); |
3c04ce01 MX |
3809 | if (!path) { |
3810 | ret = -ENOMEM; | |
3811 | goto out; | |
3812 | } | |
6ef5ed0d JB |
3813 | path->leave_spinning = 1; |
3814 | ||
3815 | trans = btrfs_start_transaction(root, 1); | |
98d5dc13 | 3816 | if (IS_ERR(trans)) { |
6ef5ed0d | 3817 | btrfs_free_path(path); |
3c04ce01 MX |
3818 | ret = PTR_ERR(trans); |
3819 | goto out; | |
6ef5ed0d JB |
3820 | } |
3821 | ||
6c41761f | 3822 | dir_id = btrfs_super_root_dir(root->fs_info->super_copy); |
6ef5ed0d JB |
3823 | di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, |
3824 | dir_id, "default", 7, 1); | |
cf1e99a4 | 3825 | if (IS_ERR_OR_NULL(di)) { |
6ef5ed0d JB |
3826 | btrfs_free_path(path); |
3827 | btrfs_end_transaction(trans, root); | |
efe120a0 FH |
3828 | btrfs_err(new_root->fs_info, "Umm, you don't have the default dir" |
3829 | "item, this isn't going to work"); | |
3c04ce01 MX |
3830 | ret = -ENOENT; |
3831 | goto out; | |
6ef5ed0d JB |
3832 | } |
3833 | ||
3834 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); | |
3835 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); | |
3836 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
3837 | btrfs_free_path(path); | |
3838 | ||
2b0ce2c2 | 3839 | btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); |
6ef5ed0d | 3840 | btrfs_end_transaction(trans, root); |
3c04ce01 MX |
3841 | out: |
3842 | mnt_drop_write_file(file); | |
3843 | return ret; | |
6ef5ed0d JB |
3844 | } |
3845 | ||
5af3e8cc SB |
3846 | void btrfs_get_block_group_info(struct list_head *groups_list, |
3847 | struct btrfs_ioctl_space_info *space) | |
bf5fc093 JB |
3848 | { |
3849 | struct btrfs_block_group_cache *block_group; | |
3850 | ||
3851 | space->total_bytes = 0; | |
3852 | space->used_bytes = 0; | |
3853 | space->flags = 0; | |
3854 | list_for_each_entry(block_group, groups_list, list) { | |
3855 | space->flags = block_group->flags; | |
3856 | space->total_bytes += block_group->key.offset; | |
3857 | space->used_bytes += | |
3858 | btrfs_block_group_used(&block_group->item); | |
3859 | } | |
3860 | } | |
3861 | ||
48a3b636 | 3862 | static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) |
1406e432 JB |
3863 | { |
3864 | struct btrfs_ioctl_space_args space_args; | |
3865 | struct btrfs_ioctl_space_info space; | |
3866 | struct btrfs_ioctl_space_info *dest; | |
7fde62bf | 3867 | struct btrfs_ioctl_space_info *dest_orig; |
13f2696f | 3868 | struct btrfs_ioctl_space_info __user *user_dest; |
1406e432 | 3869 | struct btrfs_space_info *info; |
bf5fc093 JB |
3870 | u64 types[] = {BTRFS_BLOCK_GROUP_DATA, |
3871 | BTRFS_BLOCK_GROUP_SYSTEM, | |
3872 | BTRFS_BLOCK_GROUP_METADATA, | |
3873 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; | |
3874 | int num_types = 4; | |
7fde62bf | 3875 | int alloc_size; |
1406e432 | 3876 | int ret = 0; |
51788b1b | 3877 | u64 slot_count = 0; |
bf5fc093 | 3878 | int i, c; |
1406e432 JB |
3879 | |
3880 | if (copy_from_user(&space_args, | |
3881 | (struct btrfs_ioctl_space_args __user *)arg, | |
3882 | sizeof(space_args))) | |
3883 | return -EFAULT; | |
3884 | ||
bf5fc093 JB |
3885 | for (i = 0; i < num_types; i++) { |
3886 | struct btrfs_space_info *tmp; | |
3887 | ||
3888 | info = NULL; | |
3889 | rcu_read_lock(); | |
3890 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
3891 | list) { | |
3892 | if (tmp->flags == types[i]) { | |
3893 | info = tmp; | |
3894 | break; | |
3895 | } | |
3896 | } | |
3897 | rcu_read_unlock(); | |
3898 | ||
3899 | if (!info) | |
3900 | continue; | |
3901 | ||
3902 | down_read(&info->groups_sem); | |
3903 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
3904 | if (!list_empty(&info->block_groups[c])) | |
3905 | slot_count++; | |
3906 | } | |
3907 | up_read(&info->groups_sem); | |
3908 | } | |
7fde62bf | 3909 | |
36523e95 DS |
3910 | /* |
3911 | * Global block reserve, exported as a space_info | |
3912 | */ | |
3913 | slot_count++; | |
3914 | ||
7fde62bf CM |
3915 | /* space_slots == 0 means they are asking for a count */ |
3916 | if (space_args.space_slots == 0) { | |
3917 | space_args.total_spaces = slot_count; | |
3918 | goto out; | |
3919 | } | |
bf5fc093 | 3920 | |
51788b1b | 3921 | slot_count = min_t(u64, space_args.space_slots, slot_count); |
bf5fc093 | 3922 | |
7fde62bf | 3923 | alloc_size = sizeof(*dest) * slot_count; |
bf5fc093 | 3924 | |
7fde62bf CM |
3925 | /* we generally have at most 6 or so space infos, one for each raid |
3926 | * level. So, a whole page should be more than enough for everyone | |
3927 | */ | |
3928 | if (alloc_size > PAGE_CACHE_SIZE) | |
3929 | return -ENOMEM; | |
3930 | ||
1406e432 | 3931 | space_args.total_spaces = 0; |
7fde62bf CM |
3932 | dest = kmalloc(alloc_size, GFP_NOFS); |
3933 | if (!dest) | |
3934 | return -ENOMEM; | |
3935 | dest_orig = dest; | |
1406e432 | 3936 | |
7fde62bf | 3937 | /* now we have a buffer to copy into */ |
bf5fc093 JB |
3938 | for (i = 0; i < num_types; i++) { |
3939 | struct btrfs_space_info *tmp; | |
3940 | ||
51788b1b DR |
3941 | if (!slot_count) |
3942 | break; | |
3943 | ||
bf5fc093 JB |
3944 | info = NULL; |
3945 | rcu_read_lock(); | |
3946 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
3947 | list) { | |
3948 | if (tmp->flags == types[i]) { | |
3949 | info = tmp; | |
3950 | break; | |
3951 | } | |
3952 | } | |
3953 | rcu_read_unlock(); | |
7fde62bf | 3954 | |
bf5fc093 JB |
3955 | if (!info) |
3956 | continue; | |
3957 | down_read(&info->groups_sem); | |
3958 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
3959 | if (!list_empty(&info->block_groups[c])) { | |
5af3e8cc SB |
3960 | btrfs_get_block_group_info( |
3961 | &info->block_groups[c], &space); | |
bf5fc093 JB |
3962 | memcpy(dest, &space, sizeof(space)); |
3963 | dest++; | |
3964 | space_args.total_spaces++; | |
51788b1b | 3965 | slot_count--; |
bf5fc093 | 3966 | } |
51788b1b DR |
3967 | if (!slot_count) |
3968 | break; | |
bf5fc093 JB |
3969 | } |
3970 | up_read(&info->groups_sem); | |
1406e432 | 3971 | } |
1406e432 | 3972 | |
36523e95 DS |
3973 | /* |
3974 | * Add global block reserve | |
3975 | */ | |
3976 | if (slot_count) { | |
3977 | struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv; | |
3978 | ||
3979 | spin_lock(&block_rsv->lock); | |
3980 | space.total_bytes = block_rsv->size; | |
3981 | space.used_bytes = block_rsv->size - block_rsv->reserved; | |
3982 | spin_unlock(&block_rsv->lock); | |
3983 | space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; | |
3984 | memcpy(dest, &space, sizeof(space)); | |
3985 | space_args.total_spaces++; | |
3986 | } | |
3987 | ||
2eec6c81 | 3988 | user_dest = (struct btrfs_ioctl_space_info __user *) |
7fde62bf CM |
3989 | (arg + sizeof(struct btrfs_ioctl_space_args)); |
3990 | ||
3991 | if (copy_to_user(user_dest, dest_orig, alloc_size)) | |
3992 | ret = -EFAULT; | |
3993 | ||
3994 | kfree(dest_orig); | |
3995 | out: | |
3996 | if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) | |
1406e432 JB |
3997 | ret = -EFAULT; |
3998 | ||
3999 | return ret; | |
4000 | } | |
4001 | ||
f46b5a66 CH |
4002 | /* |
4003 | * there are many ways the trans_start and trans_end ioctls can lead | |
4004 | * to deadlocks. They should only be used by applications that | |
4005 | * basically own the machine, and have a very in depth understanding | |
4006 | * of all the possible deadlocks and enospc problems. | |
4007 | */ | |
4008 | long btrfs_ioctl_trans_end(struct file *file) | |
4009 | { | |
496ad9aa | 4010 | struct inode *inode = file_inode(file); |
f46b5a66 CH |
4011 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4012 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 4013 | |
f46b5a66 | 4014 | trans = file->private_data; |
1ab86aed SW |
4015 | if (!trans) |
4016 | return -EINVAL; | |
b214107e | 4017 | file->private_data = NULL; |
9ca9ee09 | 4018 | |
1ab86aed SW |
4019 | btrfs_end_transaction(trans, root); |
4020 | ||
a4abeea4 | 4021 | atomic_dec(&root->fs_info->open_ioctl_trans); |
9ca9ee09 | 4022 | |
2a79f17e | 4023 | mnt_drop_write_file(file); |
1ab86aed | 4024 | return 0; |
f46b5a66 CH |
4025 | } |
4026 | ||
9a8c28be MX |
4027 | static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, |
4028 | void __user *argp) | |
46204592 | 4029 | { |
46204592 SW |
4030 | struct btrfs_trans_handle *trans; |
4031 | u64 transid; | |
db5b493a | 4032 | int ret; |
46204592 | 4033 | |
d4edf39b | 4034 | trans = btrfs_attach_transaction_barrier(root); |
ff7c1d33 MX |
4035 | if (IS_ERR(trans)) { |
4036 | if (PTR_ERR(trans) != -ENOENT) | |
4037 | return PTR_ERR(trans); | |
4038 | ||
4039 | /* No running transaction, don't bother */ | |
4040 | transid = root->fs_info->last_trans_committed; | |
4041 | goto out; | |
4042 | } | |
46204592 | 4043 | transid = trans->transid; |
db5b493a | 4044 | ret = btrfs_commit_transaction_async(trans, root, 0); |
8b2b2d3c TI |
4045 | if (ret) { |
4046 | btrfs_end_transaction(trans, root); | |
db5b493a | 4047 | return ret; |
8b2b2d3c | 4048 | } |
ff7c1d33 | 4049 | out: |
46204592 SW |
4050 | if (argp) |
4051 | if (copy_to_user(argp, &transid, sizeof(transid))) | |
4052 | return -EFAULT; | |
4053 | return 0; | |
4054 | } | |
4055 | ||
9a8c28be MX |
4056 | static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, |
4057 | void __user *argp) | |
46204592 | 4058 | { |
46204592 SW |
4059 | u64 transid; |
4060 | ||
4061 | if (argp) { | |
4062 | if (copy_from_user(&transid, argp, sizeof(transid))) | |
4063 | return -EFAULT; | |
4064 | } else { | |
4065 | transid = 0; /* current trans */ | |
4066 | } | |
4067 | return btrfs_wait_for_commit(root, transid); | |
4068 | } | |
4069 | ||
b8e95489 | 4070 | static long btrfs_ioctl_scrub(struct file *file, void __user *arg) |
475f6387 | 4071 | { |
496ad9aa | 4072 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
475f6387 | 4073 | struct btrfs_ioctl_scrub_args *sa; |
b8e95489 | 4074 | int ret; |
475f6387 JS |
4075 | |
4076 | if (!capable(CAP_SYS_ADMIN)) | |
4077 | return -EPERM; | |
4078 | ||
4079 | sa = memdup_user(arg, sizeof(*sa)); | |
4080 | if (IS_ERR(sa)) | |
4081 | return PTR_ERR(sa); | |
4082 | ||
b8e95489 MX |
4083 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) { |
4084 | ret = mnt_want_write_file(file); | |
4085 | if (ret) | |
4086 | goto out; | |
4087 | } | |
4088 | ||
aa1b8cd4 | 4089 | ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, |
63a212ab SB |
4090 | &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, |
4091 | 0); | |
475f6387 JS |
4092 | |
4093 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
4094 | ret = -EFAULT; | |
4095 | ||
b8e95489 MX |
4096 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) |
4097 | mnt_drop_write_file(file); | |
4098 | out: | |
475f6387 JS |
4099 | kfree(sa); |
4100 | return ret; | |
4101 | } | |
4102 | ||
4103 | static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) | |
4104 | { | |
4105 | if (!capable(CAP_SYS_ADMIN)) | |
4106 | return -EPERM; | |
4107 | ||
aa1b8cd4 | 4108 | return btrfs_scrub_cancel(root->fs_info); |
475f6387 JS |
4109 | } |
4110 | ||
4111 | static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, | |
4112 | void __user *arg) | |
4113 | { | |
4114 | struct btrfs_ioctl_scrub_args *sa; | |
4115 | int ret; | |
4116 | ||
4117 | if (!capable(CAP_SYS_ADMIN)) | |
4118 | return -EPERM; | |
4119 | ||
4120 | sa = memdup_user(arg, sizeof(*sa)); | |
4121 | if (IS_ERR(sa)) | |
4122 | return PTR_ERR(sa); | |
4123 | ||
4124 | ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); | |
4125 | ||
4126 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
4127 | ret = -EFAULT; | |
4128 | ||
4129 | kfree(sa); | |
4130 | return ret; | |
4131 | } | |
4132 | ||
c11d2c23 | 4133 | static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, |
b27f7c0c | 4134 | void __user *arg) |
c11d2c23 SB |
4135 | { |
4136 | struct btrfs_ioctl_get_dev_stats *sa; | |
4137 | int ret; | |
4138 | ||
c11d2c23 SB |
4139 | sa = memdup_user(arg, sizeof(*sa)); |
4140 | if (IS_ERR(sa)) | |
4141 | return PTR_ERR(sa); | |
4142 | ||
b27f7c0c DS |
4143 | if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { |
4144 | kfree(sa); | |
4145 | return -EPERM; | |
4146 | } | |
4147 | ||
4148 | ret = btrfs_get_dev_stats(root, sa); | |
c11d2c23 SB |
4149 | |
4150 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
4151 | ret = -EFAULT; | |
4152 | ||
4153 | kfree(sa); | |
4154 | return ret; | |
4155 | } | |
4156 | ||
3f6bcfbd SB |
4157 | static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) |
4158 | { | |
4159 | struct btrfs_ioctl_dev_replace_args *p; | |
4160 | int ret; | |
4161 | ||
4162 | if (!capable(CAP_SYS_ADMIN)) | |
4163 | return -EPERM; | |
4164 | ||
4165 | p = memdup_user(arg, sizeof(*p)); | |
4166 | if (IS_ERR(p)) | |
4167 | return PTR_ERR(p); | |
4168 | ||
4169 | switch (p->cmd) { | |
4170 | case BTRFS_IOCTL_DEV_REPLACE_CMD_START: | |
adfa97cb ID |
4171 | if (root->fs_info->sb->s_flags & MS_RDONLY) { |
4172 | ret = -EROFS; | |
4173 | goto out; | |
4174 | } | |
3f6bcfbd SB |
4175 | if (atomic_xchg( |
4176 | &root->fs_info->mutually_exclusive_operation_running, | |
4177 | 1)) { | |
e57138b3 | 4178 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
3f6bcfbd SB |
4179 | } else { |
4180 | ret = btrfs_dev_replace_start(root, p); | |
4181 | atomic_set( | |
4182 | &root->fs_info->mutually_exclusive_operation_running, | |
4183 | 0); | |
4184 | } | |
4185 | break; | |
4186 | case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: | |
4187 | btrfs_dev_replace_status(root->fs_info, p); | |
4188 | ret = 0; | |
4189 | break; | |
4190 | case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: | |
4191 | ret = btrfs_dev_replace_cancel(root->fs_info, p); | |
4192 | break; | |
4193 | default: | |
4194 | ret = -EINVAL; | |
4195 | break; | |
4196 | } | |
4197 | ||
4198 | if (copy_to_user(arg, p, sizeof(*p))) | |
4199 | ret = -EFAULT; | |
adfa97cb | 4200 | out: |
3f6bcfbd SB |
4201 | kfree(p); |
4202 | return ret; | |
4203 | } | |
4204 | ||
d7728c96 JS |
4205 | static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) |
4206 | { | |
4207 | int ret = 0; | |
4208 | int i; | |
740c3d22 | 4209 | u64 rel_ptr; |
d7728c96 | 4210 | int size; |
806468f8 | 4211 | struct btrfs_ioctl_ino_path_args *ipa = NULL; |
d7728c96 JS |
4212 | struct inode_fs_paths *ipath = NULL; |
4213 | struct btrfs_path *path; | |
4214 | ||
82b22ac8 | 4215 | if (!capable(CAP_DAC_READ_SEARCH)) |
d7728c96 JS |
4216 | return -EPERM; |
4217 | ||
4218 | path = btrfs_alloc_path(); | |
4219 | if (!path) { | |
4220 | ret = -ENOMEM; | |
4221 | goto out; | |
4222 | } | |
4223 | ||
4224 | ipa = memdup_user(arg, sizeof(*ipa)); | |
4225 | if (IS_ERR(ipa)) { | |
4226 | ret = PTR_ERR(ipa); | |
4227 | ipa = NULL; | |
4228 | goto out; | |
4229 | } | |
4230 | ||
4231 | size = min_t(u32, ipa->size, 4096); | |
4232 | ipath = init_ipath(size, root, path); | |
4233 | if (IS_ERR(ipath)) { | |
4234 | ret = PTR_ERR(ipath); | |
4235 | ipath = NULL; | |
4236 | goto out; | |
4237 | } | |
4238 | ||
4239 | ret = paths_from_inode(ipa->inum, ipath); | |
4240 | if (ret < 0) | |
4241 | goto out; | |
4242 | ||
4243 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) { | |
745c4d8e JM |
4244 | rel_ptr = ipath->fspath->val[i] - |
4245 | (u64)(unsigned long)ipath->fspath->val; | |
740c3d22 | 4246 | ipath->fspath->val[i] = rel_ptr; |
d7728c96 JS |
4247 | } |
4248 | ||
745c4d8e JM |
4249 | ret = copy_to_user((void *)(unsigned long)ipa->fspath, |
4250 | (void *)(unsigned long)ipath->fspath, size); | |
d7728c96 JS |
4251 | if (ret) { |
4252 | ret = -EFAULT; | |
4253 | goto out; | |
4254 | } | |
4255 | ||
4256 | out: | |
4257 | btrfs_free_path(path); | |
4258 | free_ipath(ipath); | |
4259 | kfree(ipa); | |
4260 | ||
4261 | return ret; | |
4262 | } | |
4263 | ||
4264 | static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) | |
4265 | { | |
4266 | struct btrfs_data_container *inodes = ctx; | |
4267 | const size_t c = 3 * sizeof(u64); | |
4268 | ||
4269 | if (inodes->bytes_left >= c) { | |
4270 | inodes->bytes_left -= c; | |
4271 | inodes->val[inodes->elem_cnt] = inum; | |
4272 | inodes->val[inodes->elem_cnt + 1] = offset; | |
4273 | inodes->val[inodes->elem_cnt + 2] = root; | |
4274 | inodes->elem_cnt += 3; | |
4275 | } else { | |
4276 | inodes->bytes_missing += c - inodes->bytes_left; | |
4277 | inodes->bytes_left = 0; | |
4278 | inodes->elem_missed += 3; | |
4279 | } | |
4280 | ||
4281 | return 0; | |
4282 | } | |
4283 | ||
4284 | static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, | |
4285 | void __user *arg) | |
4286 | { | |
4287 | int ret = 0; | |
4288 | int size; | |
d7728c96 JS |
4289 | struct btrfs_ioctl_logical_ino_args *loi; |
4290 | struct btrfs_data_container *inodes = NULL; | |
4291 | struct btrfs_path *path = NULL; | |
d7728c96 JS |
4292 | |
4293 | if (!capable(CAP_SYS_ADMIN)) | |
4294 | return -EPERM; | |
4295 | ||
4296 | loi = memdup_user(arg, sizeof(*loi)); | |
4297 | if (IS_ERR(loi)) { | |
4298 | ret = PTR_ERR(loi); | |
4299 | loi = NULL; | |
4300 | goto out; | |
4301 | } | |
4302 | ||
4303 | path = btrfs_alloc_path(); | |
4304 | if (!path) { | |
4305 | ret = -ENOMEM; | |
4306 | goto out; | |
4307 | } | |
4308 | ||
425d17a2 | 4309 | size = min_t(u32, loi->size, 64 * 1024); |
d7728c96 JS |
4310 | inodes = init_data_container(size); |
4311 | if (IS_ERR(inodes)) { | |
4312 | ret = PTR_ERR(inodes); | |
4313 | inodes = NULL; | |
4314 | goto out; | |
4315 | } | |
4316 | ||
df031f07 LB |
4317 | ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, |
4318 | build_ino_list, inodes); | |
4319 | if (ret == -EINVAL) | |
d7728c96 JS |
4320 | ret = -ENOENT; |
4321 | if (ret < 0) | |
4322 | goto out; | |
4323 | ||
745c4d8e JM |
4324 | ret = copy_to_user((void *)(unsigned long)loi->inodes, |
4325 | (void *)(unsigned long)inodes, size); | |
d7728c96 JS |
4326 | if (ret) |
4327 | ret = -EFAULT; | |
4328 | ||
4329 | out: | |
4330 | btrfs_free_path(path); | |
425d17a2 | 4331 | vfree(inodes); |
d7728c96 JS |
4332 | kfree(loi); |
4333 | ||
4334 | return ret; | |
4335 | } | |
4336 | ||
19a39dce | 4337 | void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, |
c9e9f97b ID |
4338 | struct btrfs_ioctl_balance_args *bargs) |
4339 | { | |
4340 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
4341 | ||
4342 | bargs->flags = bctl->flags; | |
4343 | ||
837d5b6e ID |
4344 | if (atomic_read(&fs_info->balance_running)) |
4345 | bargs->state |= BTRFS_BALANCE_STATE_RUNNING; | |
4346 | if (atomic_read(&fs_info->balance_pause_req)) | |
4347 | bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; | |
a7e99c69 ID |
4348 | if (atomic_read(&fs_info->balance_cancel_req)) |
4349 | bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; | |
837d5b6e | 4350 | |
c9e9f97b ID |
4351 | memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); |
4352 | memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); | |
4353 | memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); | |
19a39dce ID |
4354 | |
4355 | if (lock) { | |
4356 | spin_lock(&fs_info->balance_lock); | |
4357 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
4358 | spin_unlock(&fs_info->balance_lock); | |
4359 | } else { | |
4360 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
4361 | } | |
c9e9f97b ID |
4362 | } |
4363 | ||
9ba1f6e4 | 4364 | static long btrfs_ioctl_balance(struct file *file, void __user *arg) |
c9e9f97b | 4365 | { |
496ad9aa | 4366 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
c9e9f97b ID |
4367 | struct btrfs_fs_info *fs_info = root->fs_info; |
4368 | struct btrfs_ioctl_balance_args *bargs; | |
4369 | struct btrfs_balance_control *bctl; | |
ed0fb78f | 4370 | bool need_unlock; /* for mut. excl. ops lock */ |
c9e9f97b ID |
4371 | int ret; |
4372 | ||
4373 | if (!capable(CAP_SYS_ADMIN)) | |
4374 | return -EPERM; | |
4375 | ||
e54bfa31 | 4376 | ret = mnt_want_write_file(file); |
9ba1f6e4 LB |
4377 | if (ret) |
4378 | return ret; | |
4379 | ||
ed0fb78f ID |
4380 | again: |
4381 | if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { | |
4382 | mutex_lock(&fs_info->volume_mutex); | |
4383 | mutex_lock(&fs_info->balance_mutex); | |
4384 | need_unlock = true; | |
4385 | goto locked; | |
4386 | } | |
4387 | ||
4388 | /* | |
4389 | * mut. excl. ops lock is locked. Three possibilites: | |
4390 | * (1) some other op is running | |
4391 | * (2) balance is running | |
4392 | * (3) balance is paused -- special case (think resume) | |
4393 | */ | |
c9e9f97b | 4394 | mutex_lock(&fs_info->balance_mutex); |
ed0fb78f ID |
4395 | if (fs_info->balance_ctl) { |
4396 | /* this is either (2) or (3) */ | |
4397 | if (!atomic_read(&fs_info->balance_running)) { | |
4398 | mutex_unlock(&fs_info->balance_mutex); | |
4399 | if (!mutex_trylock(&fs_info->volume_mutex)) | |
4400 | goto again; | |
4401 | mutex_lock(&fs_info->balance_mutex); | |
4402 | ||
4403 | if (fs_info->balance_ctl && | |
4404 | !atomic_read(&fs_info->balance_running)) { | |
4405 | /* this is (3) */ | |
4406 | need_unlock = false; | |
4407 | goto locked; | |
4408 | } | |
4409 | ||
4410 | mutex_unlock(&fs_info->balance_mutex); | |
4411 | mutex_unlock(&fs_info->volume_mutex); | |
4412 | goto again; | |
4413 | } else { | |
4414 | /* this is (2) */ | |
4415 | mutex_unlock(&fs_info->balance_mutex); | |
4416 | ret = -EINPROGRESS; | |
4417 | goto out; | |
4418 | } | |
4419 | } else { | |
4420 | /* this is (1) */ | |
4421 | mutex_unlock(&fs_info->balance_mutex); | |
e57138b3 | 4422 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
ed0fb78f ID |
4423 | goto out; |
4424 | } | |
4425 | ||
4426 | locked: | |
4427 | BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); | |
c9e9f97b ID |
4428 | |
4429 | if (arg) { | |
4430 | bargs = memdup_user(arg, sizeof(*bargs)); | |
4431 | if (IS_ERR(bargs)) { | |
4432 | ret = PTR_ERR(bargs); | |
ed0fb78f | 4433 | goto out_unlock; |
c9e9f97b | 4434 | } |
de322263 ID |
4435 | |
4436 | if (bargs->flags & BTRFS_BALANCE_RESUME) { | |
4437 | if (!fs_info->balance_ctl) { | |
4438 | ret = -ENOTCONN; | |
4439 | goto out_bargs; | |
4440 | } | |
4441 | ||
4442 | bctl = fs_info->balance_ctl; | |
4443 | spin_lock(&fs_info->balance_lock); | |
4444 | bctl->flags |= BTRFS_BALANCE_RESUME; | |
4445 | spin_unlock(&fs_info->balance_lock); | |
4446 | ||
4447 | goto do_balance; | |
4448 | } | |
c9e9f97b ID |
4449 | } else { |
4450 | bargs = NULL; | |
4451 | } | |
4452 | ||
ed0fb78f | 4453 | if (fs_info->balance_ctl) { |
837d5b6e ID |
4454 | ret = -EINPROGRESS; |
4455 | goto out_bargs; | |
4456 | } | |
4457 | ||
c9e9f97b ID |
4458 | bctl = kzalloc(sizeof(*bctl), GFP_NOFS); |
4459 | if (!bctl) { | |
4460 | ret = -ENOMEM; | |
4461 | goto out_bargs; | |
4462 | } | |
4463 | ||
4464 | bctl->fs_info = fs_info; | |
4465 | if (arg) { | |
4466 | memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); | |
4467 | memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); | |
4468 | memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); | |
4469 | ||
4470 | bctl->flags = bargs->flags; | |
f43ffb60 ID |
4471 | } else { |
4472 | /* balance everything - no filters */ | |
4473 | bctl->flags |= BTRFS_BALANCE_TYPE_MASK; | |
c9e9f97b ID |
4474 | } |
4475 | ||
de322263 | 4476 | do_balance: |
c9e9f97b | 4477 | /* |
ed0fb78f ID |
4478 | * Ownership of bctl and mutually_exclusive_operation_running |
4479 | * goes to to btrfs_balance. bctl is freed in __cancel_balance, | |
4480 | * or, if restriper was paused all the way until unmount, in | |
4481 | * free_fs_info. mutually_exclusive_operation_running is | |
4482 | * cleared in __cancel_balance. | |
c9e9f97b | 4483 | */ |
ed0fb78f ID |
4484 | need_unlock = false; |
4485 | ||
4486 | ret = btrfs_balance(bctl, bargs); | |
4487 | ||
c9e9f97b ID |
4488 | if (arg) { |
4489 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
4490 | ret = -EFAULT; | |
4491 | } | |
4492 | ||
4493 | out_bargs: | |
4494 | kfree(bargs); | |
ed0fb78f | 4495 | out_unlock: |
c9e9f97b ID |
4496 | mutex_unlock(&fs_info->balance_mutex); |
4497 | mutex_unlock(&fs_info->volume_mutex); | |
ed0fb78f ID |
4498 | if (need_unlock) |
4499 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); | |
4500 | out: | |
e54bfa31 | 4501 | mnt_drop_write_file(file); |
c9e9f97b ID |
4502 | return ret; |
4503 | } | |
4504 | ||
837d5b6e ID |
4505 | static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) |
4506 | { | |
4507 | if (!capable(CAP_SYS_ADMIN)) | |
4508 | return -EPERM; | |
4509 | ||
4510 | switch (cmd) { | |
4511 | case BTRFS_BALANCE_CTL_PAUSE: | |
4512 | return btrfs_pause_balance(root->fs_info); | |
a7e99c69 ID |
4513 | case BTRFS_BALANCE_CTL_CANCEL: |
4514 | return btrfs_cancel_balance(root->fs_info); | |
837d5b6e ID |
4515 | } |
4516 | ||
4517 | return -EINVAL; | |
4518 | } | |
4519 | ||
19a39dce ID |
4520 | static long btrfs_ioctl_balance_progress(struct btrfs_root *root, |
4521 | void __user *arg) | |
4522 | { | |
4523 | struct btrfs_fs_info *fs_info = root->fs_info; | |
4524 | struct btrfs_ioctl_balance_args *bargs; | |
4525 | int ret = 0; | |
4526 | ||
4527 | if (!capable(CAP_SYS_ADMIN)) | |
4528 | return -EPERM; | |
4529 | ||
4530 | mutex_lock(&fs_info->balance_mutex); | |
4531 | if (!fs_info->balance_ctl) { | |
4532 | ret = -ENOTCONN; | |
4533 | goto out; | |
4534 | } | |
4535 | ||
4536 | bargs = kzalloc(sizeof(*bargs), GFP_NOFS); | |
4537 | if (!bargs) { | |
4538 | ret = -ENOMEM; | |
4539 | goto out; | |
4540 | } | |
4541 | ||
4542 | update_ioctl_balance_args(fs_info, 1, bargs); | |
4543 | ||
4544 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
4545 | ret = -EFAULT; | |
4546 | ||
4547 | kfree(bargs); | |
4548 | out: | |
4549 | mutex_unlock(&fs_info->balance_mutex); | |
4550 | return ret; | |
4551 | } | |
4552 | ||
905b0dda | 4553 | static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) |
5d13a37b | 4554 | { |
496ad9aa | 4555 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4556 | struct btrfs_ioctl_quota_ctl_args *sa; |
4557 | struct btrfs_trans_handle *trans = NULL; | |
4558 | int ret; | |
4559 | int err; | |
4560 | ||
4561 | if (!capable(CAP_SYS_ADMIN)) | |
4562 | return -EPERM; | |
4563 | ||
905b0dda MX |
4564 | ret = mnt_want_write_file(file); |
4565 | if (ret) | |
4566 | return ret; | |
5d13a37b AJ |
4567 | |
4568 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4569 | if (IS_ERR(sa)) { |
4570 | ret = PTR_ERR(sa); | |
4571 | goto drop_write; | |
4572 | } | |
5d13a37b | 4573 | |
7708f029 | 4574 | down_write(&root->fs_info->subvol_sem); |
2f232036 JS |
4575 | trans = btrfs_start_transaction(root->fs_info->tree_root, 2); |
4576 | if (IS_ERR(trans)) { | |
4577 | ret = PTR_ERR(trans); | |
4578 | goto out; | |
5d13a37b AJ |
4579 | } |
4580 | ||
4581 | switch (sa->cmd) { | |
4582 | case BTRFS_QUOTA_CTL_ENABLE: | |
4583 | ret = btrfs_quota_enable(trans, root->fs_info); | |
4584 | break; | |
4585 | case BTRFS_QUOTA_CTL_DISABLE: | |
4586 | ret = btrfs_quota_disable(trans, root->fs_info); | |
4587 | break; | |
5d13a37b AJ |
4588 | default: |
4589 | ret = -EINVAL; | |
4590 | break; | |
4591 | } | |
4592 | ||
2f232036 JS |
4593 | err = btrfs_commit_transaction(trans, root->fs_info->tree_root); |
4594 | if (err && !ret) | |
4595 | ret = err; | |
5d13a37b AJ |
4596 | out: |
4597 | kfree(sa); | |
7708f029 | 4598 | up_write(&root->fs_info->subvol_sem); |
905b0dda MX |
4599 | drop_write: |
4600 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4601 | return ret; |
4602 | } | |
4603 | ||
905b0dda | 4604 | static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) |
5d13a37b | 4605 | { |
496ad9aa | 4606 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4607 | struct btrfs_ioctl_qgroup_assign_args *sa; |
4608 | struct btrfs_trans_handle *trans; | |
4609 | int ret; | |
4610 | int err; | |
4611 | ||
4612 | if (!capable(CAP_SYS_ADMIN)) | |
4613 | return -EPERM; | |
4614 | ||
905b0dda MX |
4615 | ret = mnt_want_write_file(file); |
4616 | if (ret) | |
4617 | return ret; | |
5d13a37b AJ |
4618 | |
4619 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4620 | if (IS_ERR(sa)) { |
4621 | ret = PTR_ERR(sa); | |
4622 | goto drop_write; | |
4623 | } | |
5d13a37b AJ |
4624 | |
4625 | trans = btrfs_join_transaction(root); | |
4626 | if (IS_ERR(trans)) { | |
4627 | ret = PTR_ERR(trans); | |
4628 | goto out; | |
4629 | } | |
4630 | ||
4631 | /* FIXME: check if the IDs really exist */ | |
4632 | if (sa->assign) { | |
4633 | ret = btrfs_add_qgroup_relation(trans, root->fs_info, | |
4634 | sa->src, sa->dst); | |
4635 | } else { | |
4636 | ret = btrfs_del_qgroup_relation(trans, root->fs_info, | |
4637 | sa->src, sa->dst); | |
4638 | } | |
4639 | ||
4640 | err = btrfs_end_transaction(trans, root); | |
4641 | if (err && !ret) | |
4642 | ret = err; | |
4643 | ||
4644 | out: | |
4645 | kfree(sa); | |
905b0dda MX |
4646 | drop_write: |
4647 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4648 | return ret; |
4649 | } | |
4650 | ||
905b0dda | 4651 | static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) |
5d13a37b | 4652 | { |
496ad9aa | 4653 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4654 | struct btrfs_ioctl_qgroup_create_args *sa; |
4655 | struct btrfs_trans_handle *trans; | |
4656 | int ret; | |
4657 | int err; | |
4658 | ||
4659 | if (!capable(CAP_SYS_ADMIN)) | |
4660 | return -EPERM; | |
4661 | ||
905b0dda MX |
4662 | ret = mnt_want_write_file(file); |
4663 | if (ret) | |
4664 | return ret; | |
5d13a37b AJ |
4665 | |
4666 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4667 | if (IS_ERR(sa)) { |
4668 | ret = PTR_ERR(sa); | |
4669 | goto drop_write; | |
4670 | } | |
5d13a37b | 4671 | |
d86e56cf MX |
4672 | if (!sa->qgroupid) { |
4673 | ret = -EINVAL; | |
4674 | goto out; | |
4675 | } | |
4676 | ||
5d13a37b AJ |
4677 | trans = btrfs_join_transaction(root); |
4678 | if (IS_ERR(trans)) { | |
4679 | ret = PTR_ERR(trans); | |
4680 | goto out; | |
4681 | } | |
4682 | ||
4683 | /* FIXME: check if the IDs really exist */ | |
4684 | if (sa->create) { | |
4685 | ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, | |
4686 | NULL); | |
4687 | } else { | |
4688 | ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); | |
4689 | } | |
4690 | ||
4691 | err = btrfs_end_transaction(trans, root); | |
4692 | if (err && !ret) | |
4693 | ret = err; | |
4694 | ||
4695 | out: | |
4696 | kfree(sa); | |
905b0dda MX |
4697 | drop_write: |
4698 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4699 | return ret; |
4700 | } | |
4701 | ||
905b0dda | 4702 | static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) |
5d13a37b | 4703 | { |
496ad9aa | 4704 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4705 | struct btrfs_ioctl_qgroup_limit_args *sa; |
4706 | struct btrfs_trans_handle *trans; | |
4707 | int ret; | |
4708 | int err; | |
4709 | u64 qgroupid; | |
4710 | ||
4711 | if (!capable(CAP_SYS_ADMIN)) | |
4712 | return -EPERM; | |
4713 | ||
905b0dda MX |
4714 | ret = mnt_want_write_file(file); |
4715 | if (ret) | |
4716 | return ret; | |
5d13a37b AJ |
4717 | |
4718 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4719 | if (IS_ERR(sa)) { |
4720 | ret = PTR_ERR(sa); | |
4721 | goto drop_write; | |
4722 | } | |
5d13a37b AJ |
4723 | |
4724 | trans = btrfs_join_transaction(root); | |
4725 | if (IS_ERR(trans)) { | |
4726 | ret = PTR_ERR(trans); | |
4727 | goto out; | |
4728 | } | |
4729 | ||
4730 | qgroupid = sa->qgroupid; | |
4731 | if (!qgroupid) { | |
4732 | /* take the current subvol as qgroup */ | |
4733 | qgroupid = root->root_key.objectid; | |
4734 | } | |
4735 | ||
4736 | /* FIXME: check if the IDs really exist */ | |
4737 | ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); | |
4738 | ||
4739 | err = btrfs_end_transaction(trans, root); | |
4740 | if (err && !ret) | |
4741 | ret = err; | |
4742 | ||
4743 | out: | |
4744 | kfree(sa); | |
905b0dda MX |
4745 | drop_write: |
4746 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4747 | return ret; |
4748 | } | |
4749 | ||
2f232036 JS |
4750 | static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) |
4751 | { | |
6d0379ec | 4752 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
2f232036 JS |
4753 | struct btrfs_ioctl_quota_rescan_args *qsa; |
4754 | int ret; | |
4755 | ||
4756 | if (!capable(CAP_SYS_ADMIN)) | |
4757 | return -EPERM; | |
4758 | ||
4759 | ret = mnt_want_write_file(file); | |
4760 | if (ret) | |
4761 | return ret; | |
4762 | ||
4763 | qsa = memdup_user(arg, sizeof(*qsa)); | |
4764 | if (IS_ERR(qsa)) { | |
4765 | ret = PTR_ERR(qsa); | |
4766 | goto drop_write; | |
4767 | } | |
4768 | ||
4769 | if (qsa->flags) { | |
4770 | ret = -EINVAL; | |
4771 | goto out; | |
4772 | } | |
4773 | ||
4774 | ret = btrfs_qgroup_rescan(root->fs_info); | |
4775 | ||
4776 | out: | |
4777 | kfree(qsa); | |
4778 | drop_write: | |
4779 | mnt_drop_write_file(file); | |
4780 | return ret; | |
4781 | } | |
4782 | ||
4783 | static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) | |
4784 | { | |
6d0379ec | 4785 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
2f232036 JS |
4786 | struct btrfs_ioctl_quota_rescan_args *qsa; |
4787 | int ret = 0; | |
4788 | ||
4789 | if (!capable(CAP_SYS_ADMIN)) | |
4790 | return -EPERM; | |
4791 | ||
4792 | qsa = kzalloc(sizeof(*qsa), GFP_NOFS); | |
4793 | if (!qsa) | |
4794 | return -ENOMEM; | |
4795 | ||
4796 | if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { | |
4797 | qsa->flags = 1; | |
4798 | qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; | |
4799 | } | |
4800 | ||
4801 | if (copy_to_user(arg, qsa, sizeof(*qsa))) | |
4802 | ret = -EFAULT; | |
4803 | ||
4804 | kfree(qsa); | |
4805 | return ret; | |
4806 | } | |
4807 | ||
57254b6e JS |
4808 | static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) |
4809 | { | |
54563d41 | 4810 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
57254b6e JS |
4811 | |
4812 | if (!capable(CAP_SYS_ADMIN)) | |
4813 | return -EPERM; | |
4814 | ||
4815 | return btrfs_qgroup_wait_for_completion(root->fs_info); | |
4816 | } | |
4817 | ||
abccd00f HM |
4818 | static long _btrfs_ioctl_set_received_subvol(struct file *file, |
4819 | struct btrfs_ioctl_received_subvol_args *sa) | |
8ea05e3a | 4820 | { |
496ad9aa | 4821 | struct inode *inode = file_inode(file); |
8ea05e3a AB |
4822 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4823 | struct btrfs_root_item *root_item = &root->root_item; | |
4824 | struct btrfs_trans_handle *trans; | |
4825 | struct timespec ct = CURRENT_TIME; | |
4826 | int ret = 0; | |
dd5f9615 | 4827 | int received_uuid_changed; |
8ea05e3a | 4828 | |
bd60ea0f DS |
4829 | if (!inode_owner_or_capable(inode)) |
4830 | return -EPERM; | |
4831 | ||
8ea05e3a AB |
4832 | ret = mnt_want_write_file(file); |
4833 | if (ret < 0) | |
4834 | return ret; | |
4835 | ||
4836 | down_write(&root->fs_info->subvol_sem); | |
4837 | ||
4838 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { | |
4839 | ret = -EINVAL; | |
4840 | goto out; | |
4841 | } | |
4842 | ||
4843 | if (btrfs_root_readonly(root)) { | |
4844 | ret = -EROFS; | |
4845 | goto out; | |
4846 | } | |
4847 | ||
dd5f9615 SB |
4848 | /* |
4849 | * 1 - root item | |
4850 | * 2 - uuid items (received uuid + subvol uuid) | |
4851 | */ | |
4852 | trans = btrfs_start_transaction(root, 3); | |
8ea05e3a AB |
4853 | if (IS_ERR(trans)) { |
4854 | ret = PTR_ERR(trans); | |
4855 | trans = NULL; | |
4856 | goto out; | |
4857 | } | |
4858 | ||
4859 | sa->rtransid = trans->transid; | |
4860 | sa->rtime.sec = ct.tv_sec; | |
4861 | sa->rtime.nsec = ct.tv_nsec; | |
4862 | ||
dd5f9615 SB |
4863 | received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, |
4864 | BTRFS_UUID_SIZE); | |
4865 | if (received_uuid_changed && | |
4866 | !btrfs_is_empty_uuid(root_item->received_uuid)) | |
4867 | btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, | |
4868 | root_item->received_uuid, | |
4869 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
4870 | root->root_key.objectid); | |
8ea05e3a AB |
4871 | memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); |
4872 | btrfs_set_root_stransid(root_item, sa->stransid); | |
4873 | btrfs_set_root_rtransid(root_item, sa->rtransid); | |
3cae210f QW |
4874 | btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); |
4875 | btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); | |
4876 | btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); | |
4877 | btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); | |
8ea05e3a AB |
4878 | |
4879 | ret = btrfs_update_root(trans, root->fs_info->tree_root, | |
4880 | &root->root_key, &root->root_item); | |
4881 | if (ret < 0) { | |
4882 | btrfs_end_transaction(trans, root); | |
8ea05e3a | 4883 | goto out; |
dd5f9615 SB |
4884 | } |
4885 | if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { | |
4886 | ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, | |
4887 | sa->uuid, | |
4888 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
4889 | root->root_key.objectid); | |
4890 | if (ret < 0 && ret != -EEXIST) { | |
4891 | btrfs_abort_transaction(trans, root, ret); | |
8ea05e3a | 4892 | goto out; |
dd5f9615 SB |
4893 | } |
4894 | } | |
4895 | ret = btrfs_commit_transaction(trans, root); | |
4896 | if (ret < 0) { | |
4897 | btrfs_abort_transaction(trans, root, ret); | |
4898 | goto out; | |
8ea05e3a AB |
4899 | } |
4900 | ||
abccd00f HM |
4901 | out: |
4902 | up_write(&root->fs_info->subvol_sem); | |
4903 | mnt_drop_write_file(file); | |
4904 | return ret; | |
4905 | } | |
4906 | ||
4907 | #ifdef CONFIG_64BIT | |
4908 | static long btrfs_ioctl_set_received_subvol_32(struct file *file, | |
4909 | void __user *arg) | |
4910 | { | |
4911 | struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; | |
4912 | struct btrfs_ioctl_received_subvol_args *args64 = NULL; | |
4913 | int ret = 0; | |
4914 | ||
4915 | args32 = memdup_user(arg, sizeof(*args32)); | |
4916 | if (IS_ERR(args32)) { | |
4917 | ret = PTR_ERR(args32); | |
4918 | args32 = NULL; | |
4919 | goto out; | |
4920 | } | |
4921 | ||
4922 | args64 = kmalloc(sizeof(*args64), GFP_NOFS); | |
84dbeb87 DC |
4923 | if (!args64) { |
4924 | ret = -ENOMEM; | |
abccd00f HM |
4925 | goto out; |
4926 | } | |
4927 | ||
4928 | memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); | |
4929 | args64->stransid = args32->stransid; | |
4930 | args64->rtransid = args32->rtransid; | |
4931 | args64->stime.sec = args32->stime.sec; | |
4932 | args64->stime.nsec = args32->stime.nsec; | |
4933 | args64->rtime.sec = args32->rtime.sec; | |
4934 | args64->rtime.nsec = args32->rtime.nsec; | |
4935 | args64->flags = args32->flags; | |
4936 | ||
4937 | ret = _btrfs_ioctl_set_received_subvol(file, args64); | |
4938 | if (ret) | |
4939 | goto out; | |
4940 | ||
4941 | memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); | |
4942 | args32->stransid = args64->stransid; | |
4943 | args32->rtransid = args64->rtransid; | |
4944 | args32->stime.sec = args64->stime.sec; | |
4945 | args32->stime.nsec = args64->stime.nsec; | |
4946 | args32->rtime.sec = args64->rtime.sec; | |
4947 | args32->rtime.nsec = args64->rtime.nsec; | |
4948 | args32->flags = args64->flags; | |
4949 | ||
4950 | ret = copy_to_user(arg, args32, sizeof(*args32)); | |
4951 | if (ret) | |
4952 | ret = -EFAULT; | |
4953 | ||
4954 | out: | |
4955 | kfree(args32); | |
4956 | kfree(args64); | |
4957 | return ret; | |
4958 | } | |
4959 | #endif | |
4960 | ||
4961 | static long btrfs_ioctl_set_received_subvol(struct file *file, | |
4962 | void __user *arg) | |
4963 | { | |
4964 | struct btrfs_ioctl_received_subvol_args *sa = NULL; | |
4965 | int ret = 0; | |
4966 | ||
4967 | sa = memdup_user(arg, sizeof(*sa)); | |
4968 | if (IS_ERR(sa)) { | |
4969 | ret = PTR_ERR(sa); | |
4970 | sa = NULL; | |
4971 | goto out; | |
4972 | } | |
4973 | ||
4974 | ret = _btrfs_ioctl_set_received_subvol(file, sa); | |
4975 | ||
4976 | if (ret) | |
4977 | goto out; | |
4978 | ||
8ea05e3a AB |
4979 | ret = copy_to_user(arg, sa, sizeof(*sa)); |
4980 | if (ret) | |
4981 | ret = -EFAULT; | |
4982 | ||
4983 | out: | |
4984 | kfree(sa); | |
8ea05e3a AB |
4985 | return ret; |
4986 | } | |
4987 | ||
867ab667 | 4988 | static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) |
4989 | { | |
6d0379ec | 4990 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
a1b83ac5 | 4991 | size_t len; |
867ab667 | 4992 | int ret; |
a1b83ac5 AJ |
4993 | char label[BTRFS_LABEL_SIZE]; |
4994 | ||
4995 | spin_lock(&root->fs_info->super_lock); | |
4996 | memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); | |
4997 | spin_unlock(&root->fs_info->super_lock); | |
4998 | ||
4999 | len = strnlen(label, BTRFS_LABEL_SIZE); | |
867ab667 | 5000 | |
5001 | if (len == BTRFS_LABEL_SIZE) { | |
efe120a0 FH |
5002 | btrfs_warn(root->fs_info, |
5003 | "label is too long, return the first %zu bytes", --len); | |
867ab667 | 5004 | } |
5005 | ||
867ab667 | 5006 | ret = copy_to_user(arg, label, len); |
867ab667 | 5007 | |
5008 | return ret ? -EFAULT : 0; | |
5009 | } | |
5010 | ||
a8bfd4ab | 5011 | static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) |
5012 | { | |
6d0379ec | 5013 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
a8bfd4ab | 5014 | struct btrfs_super_block *super_block = root->fs_info->super_copy; |
5015 | struct btrfs_trans_handle *trans; | |
5016 | char label[BTRFS_LABEL_SIZE]; | |
5017 | int ret; | |
5018 | ||
5019 | if (!capable(CAP_SYS_ADMIN)) | |
5020 | return -EPERM; | |
5021 | ||
5022 | if (copy_from_user(label, arg, sizeof(label))) | |
5023 | return -EFAULT; | |
5024 | ||
5025 | if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { | |
efe120a0 | 5026 | btrfs_err(root->fs_info, "unable to set label with more than %d bytes", |
a8bfd4ab | 5027 | BTRFS_LABEL_SIZE - 1); |
5028 | return -EINVAL; | |
5029 | } | |
5030 | ||
5031 | ret = mnt_want_write_file(file); | |
5032 | if (ret) | |
5033 | return ret; | |
5034 | ||
a8bfd4ab | 5035 | trans = btrfs_start_transaction(root, 0); |
5036 | if (IS_ERR(trans)) { | |
5037 | ret = PTR_ERR(trans); | |
5038 | goto out_unlock; | |
5039 | } | |
5040 | ||
a1b83ac5 | 5041 | spin_lock(&root->fs_info->super_lock); |
a8bfd4ab | 5042 | strcpy(super_block->label, label); |
a1b83ac5 | 5043 | spin_unlock(&root->fs_info->super_lock); |
d0270aca | 5044 | ret = btrfs_commit_transaction(trans, root); |
a8bfd4ab | 5045 | |
5046 | out_unlock: | |
a8bfd4ab | 5047 | mnt_drop_write_file(file); |
5048 | return ret; | |
5049 | } | |
5050 | ||
2eaa055f JM |
5051 | #define INIT_FEATURE_FLAGS(suffix) \ |
5052 | { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ | |
5053 | .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ | |
5054 | .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } | |
5055 | ||
5056 | static int btrfs_ioctl_get_supported_features(struct file *file, | |
5057 | void __user *arg) | |
5058 | { | |
5059 | static struct btrfs_ioctl_feature_flags features[3] = { | |
5060 | INIT_FEATURE_FLAGS(SUPP), | |
5061 | INIT_FEATURE_FLAGS(SAFE_SET), | |
5062 | INIT_FEATURE_FLAGS(SAFE_CLEAR) | |
5063 | }; | |
5064 | ||
5065 | if (copy_to_user(arg, &features, sizeof(features))) | |
5066 | return -EFAULT; | |
5067 | ||
5068 | return 0; | |
5069 | } | |
5070 | ||
5071 | static int btrfs_ioctl_get_features(struct file *file, void __user *arg) | |
5072 | { | |
5073 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; | |
5074 | struct btrfs_super_block *super_block = root->fs_info->super_copy; | |
5075 | struct btrfs_ioctl_feature_flags features; | |
5076 | ||
5077 | features.compat_flags = btrfs_super_compat_flags(super_block); | |
5078 | features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); | |
5079 | features.incompat_flags = btrfs_super_incompat_flags(super_block); | |
5080 | ||
5081 | if (copy_to_user(arg, &features, sizeof(features))) | |
5082 | return -EFAULT; | |
5083 | ||
5084 | return 0; | |
5085 | } | |
5086 | ||
3b02a68a JM |
5087 | static int check_feature_bits(struct btrfs_root *root, |
5088 | enum btrfs_feature_set set, | |
2eaa055f JM |
5089 | u64 change_mask, u64 flags, u64 supported_flags, |
5090 | u64 safe_set, u64 safe_clear) | |
5091 | { | |
3b02a68a JM |
5092 | const char *type = btrfs_feature_set_names[set]; |
5093 | char *names; | |
2eaa055f JM |
5094 | u64 disallowed, unsupported; |
5095 | u64 set_mask = flags & change_mask; | |
5096 | u64 clear_mask = ~flags & change_mask; | |
5097 | ||
5098 | unsupported = set_mask & ~supported_flags; | |
5099 | if (unsupported) { | |
3b02a68a JM |
5100 | names = btrfs_printable_features(set, unsupported); |
5101 | if (names) { | |
5102 | btrfs_warn(root->fs_info, | |
5103 | "this kernel does not support the %s feature bit%s", | |
5104 | names, strchr(names, ',') ? "s" : ""); | |
5105 | kfree(names); | |
5106 | } else | |
5107 | btrfs_warn(root->fs_info, | |
2eaa055f JM |
5108 | "this kernel does not support %s bits 0x%llx", |
5109 | type, unsupported); | |
5110 | return -EOPNOTSUPP; | |
5111 | } | |
5112 | ||
5113 | disallowed = set_mask & ~safe_set; | |
5114 | if (disallowed) { | |
3b02a68a JM |
5115 | names = btrfs_printable_features(set, disallowed); |
5116 | if (names) { | |
5117 | btrfs_warn(root->fs_info, | |
5118 | "can't set the %s feature bit%s while mounted", | |
5119 | names, strchr(names, ',') ? "s" : ""); | |
5120 | kfree(names); | |
5121 | } else | |
5122 | btrfs_warn(root->fs_info, | |
2eaa055f JM |
5123 | "can't set %s bits 0x%llx while mounted", |
5124 | type, disallowed); | |
5125 | return -EPERM; | |
5126 | } | |
5127 | ||
5128 | disallowed = clear_mask & ~safe_clear; | |
5129 | if (disallowed) { | |
3b02a68a JM |
5130 | names = btrfs_printable_features(set, disallowed); |
5131 | if (names) { | |
5132 | btrfs_warn(root->fs_info, | |
5133 | "can't clear the %s feature bit%s while mounted", | |
5134 | names, strchr(names, ',') ? "s" : ""); | |
5135 | kfree(names); | |
5136 | } else | |
5137 | btrfs_warn(root->fs_info, | |
2eaa055f JM |
5138 | "can't clear %s bits 0x%llx while mounted", |
5139 | type, disallowed); | |
5140 | return -EPERM; | |
5141 | } | |
5142 | ||
5143 | return 0; | |
5144 | } | |
5145 | ||
5146 | #define check_feature(root, change_mask, flags, mask_base) \ | |
3b02a68a | 5147 | check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ |
2eaa055f JM |
5148 | BTRFS_FEATURE_ ## mask_base ## _SUPP, \ |
5149 | BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ | |
5150 | BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) | |
5151 | ||
5152 | static int btrfs_ioctl_set_features(struct file *file, void __user *arg) | |
5153 | { | |
5154 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; | |
5155 | struct btrfs_super_block *super_block = root->fs_info->super_copy; | |
5156 | struct btrfs_ioctl_feature_flags flags[2]; | |
5157 | struct btrfs_trans_handle *trans; | |
5158 | u64 newflags; | |
5159 | int ret; | |
5160 | ||
5161 | if (!capable(CAP_SYS_ADMIN)) | |
5162 | return -EPERM; | |
5163 | ||
5164 | if (copy_from_user(flags, arg, sizeof(flags))) | |
5165 | return -EFAULT; | |
5166 | ||
5167 | /* Nothing to do */ | |
5168 | if (!flags[0].compat_flags && !flags[0].compat_ro_flags && | |
5169 | !flags[0].incompat_flags) | |
5170 | return 0; | |
5171 | ||
5172 | ret = check_feature(root, flags[0].compat_flags, | |
5173 | flags[1].compat_flags, COMPAT); | |
5174 | if (ret) | |
5175 | return ret; | |
5176 | ||
5177 | ret = check_feature(root, flags[0].compat_ro_flags, | |
5178 | flags[1].compat_ro_flags, COMPAT_RO); | |
5179 | if (ret) | |
5180 | return ret; | |
5181 | ||
5182 | ret = check_feature(root, flags[0].incompat_flags, | |
5183 | flags[1].incompat_flags, INCOMPAT); | |
5184 | if (ret) | |
5185 | return ret; | |
5186 | ||
8051aa1a | 5187 | trans = btrfs_start_transaction(root, 0); |
2eaa055f JM |
5188 | if (IS_ERR(trans)) |
5189 | return PTR_ERR(trans); | |
5190 | ||
5191 | spin_lock(&root->fs_info->super_lock); | |
5192 | newflags = btrfs_super_compat_flags(super_block); | |
5193 | newflags |= flags[0].compat_flags & flags[1].compat_flags; | |
5194 | newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); | |
5195 | btrfs_set_super_compat_flags(super_block, newflags); | |
5196 | ||
5197 | newflags = btrfs_super_compat_ro_flags(super_block); | |
5198 | newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; | |
5199 | newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); | |
5200 | btrfs_set_super_compat_ro_flags(super_block, newflags); | |
5201 | ||
5202 | newflags = btrfs_super_incompat_flags(super_block); | |
5203 | newflags |= flags[0].incompat_flags & flags[1].incompat_flags; | |
5204 | newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); | |
5205 | btrfs_set_super_incompat_flags(super_block, newflags); | |
5206 | spin_unlock(&root->fs_info->super_lock); | |
5207 | ||
d0270aca | 5208 | return btrfs_commit_transaction(trans, root); |
2eaa055f JM |
5209 | } |
5210 | ||
f46b5a66 CH |
5211 | long btrfs_ioctl(struct file *file, unsigned int |
5212 | cmd, unsigned long arg) | |
5213 | { | |
496ad9aa | 5214 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
4bcabaa3 | 5215 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
5216 | |
5217 | switch (cmd) { | |
6cbff00f CH |
5218 | case FS_IOC_GETFLAGS: |
5219 | return btrfs_ioctl_getflags(file, argp); | |
5220 | case FS_IOC_SETFLAGS: | |
5221 | return btrfs_ioctl_setflags(file, argp); | |
5222 | case FS_IOC_GETVERSION: | |
5223 | return btrfs_ioctl_getversion(file, argp); | |
f7039b1d LD |
5224 | case FITRIM: |
5225 | return btrfs_ioctl_fitrim(file, argp); | |
f46b5a66 | 5226 | case BTRFS_IOC_SNAP_CREATE: |
fa0d2b9b | 5227 | return btrfs_ioctl_snap_create(file, argp, 0); |
fdfb1e4f | 5228 | case BTRFS_IOC_SNAP_CREATE_V2: |
fa0d2b9b | 5229 | return btrfs_ioctl_snap_create_v2(file, argp, 0); |
3de4586c | 5230 | case BTRFS_IOC_SUBVOL_CREATE: |
fa0d2b9b | 5231 | return btrfs_ioctl_snap_create(file, argp, 1); |
6f72c7e2 AJ |
5232 | case BTRFS_IOC_SUBVOL_CREATE_V2: |
5233 | return btrfs_ioctl_snap_create_v2(file, argp, 1); | |
76dda93c YZ |
5234 | case BTRFS_IOC_SNAP_DESTROY: |
5235 | return btrfs_ioctl_snap_destroy(file, argp); | |
0caa102d LZ |
5236 | case BTRFS_IOC_SUBVOL_GETFLAGS: |
5237 | return btrfs_ioctl_subvol_getflags(file, argp); | |
5238 | case BTRFS_IOC_SUBVOL_SETFLAGS: | |
5239 | return btrfs_ioctl_subvol_setflags(file, argp); | |
6ef5ed0d JB |
5240 | case BTRFS_IOC_DEFAULT_SUBVOL: |
5241 | return btrfs_ioctl_default_subvol(file, argp); | |
f46b5a66 | 5242 | case BTRFS_IOC_DEFRAG: |
1e701a32 CM |
5243 | return btrfs_ioctl_defrag(file, NULL); |
5244 | case BTRFS_IOC_DEFRAG_RANGE: | |
5245 | return btrfs_ioctl_defrag(file, argp); | |
f46b5a66 | 5246 | case BTRFS_IOC_RESIZE: |
198605a8 | 5247 | return btrfs_ioctl_resize(file, argp); |
f46b5a66 | 5248 | case BTRFS_IOC_ADD_DEV: |
4bcabaa3 | 5249 | return btrfs_ioctl_add_dev(root, argp); |
f46b5a66 | 5250 | case BTRFS_IOC_RM_DEV: |
da24927b | 5251 | return btrfs_ioctl_rm_dev(file, argp); |
475f6387 JS |
5252 | case BTRFS_IOC_FS_INFO: |
5253 | return btrfs_ioctl_fs_info(root, argp); | |
5254 | case BTRFS_IOC_DEV_INFO: | |
5255 | return btrfs_ioctl_dev_info(root, argp); | |
f46b5a66 | 5256 | case BTRFS_IOC_BALANCE: |
9ba1f6e4 | 5257 | return btrfs_ioctl_balance(file, NULL); |
f46b5a66 | 5258 | case BTRFS_IOC_CLONE: |
c5c9cd4d SW |
5259 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
5260 | case BTRFS_IOC_CLONE_RANGE: | |
7a865e8a | 5261 | return btrfs_ioctl_clone_range(file, argp); |
f46b5a66 CH |
5262 | case BTRFS_IOC_TRANS_START: |
5263 | return btrfs_ioctl_trans_start(file); | |
5264 | case BTRFS_IOC_TRANS_END: | |
5265 | return btrfs_ioctl_trans_end(file); | |
ac8e9819 CM |
5266 | case BTRFS_IOC_TREE_SEARCH: |
5267 | return btrfs_ioctl_tree_search(file, argp); | |
cc68a8a5 GH |
5268 | case BTRFS_IOC_TREE_SEARCH_V2: |
5269 | return btrfs_ioctl_tree_search_v2(file, argp); | |
ac8e9819 CM |
5270 | case BTRFS_IOC_INO_LOOKUP: |
5271 | return btrfs_ioctl_ino_lookup(file, argp); | |
d7728c96 JS |
5272 | case BTRFS_IOC_INO_PATHS: |
5273 | return btrfs_ioctl_ino_to_path(root, argp); | |
5274 | case BTRFS_IOC_LOGICAL_INO: | |
5275 | return btrfs_ioctl_logical_to_ino(root, argp); | |
1406e432 JB |
5276 | case BTRFS_IOC_SPACE_INFO: |
5277 | return btrfs_ioctl_space_info(root, argp); | |
9b199859 FDBM |
5278 | case BTRFS_IOC_SYNC: { |
5279 | int ret; | |
5280 | ||
6c255e67 | 5281 | ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); |
9b199859 FDBM |
5282 | if (ret) |
5283 | return ret; | |
5284 | ret = btrfs_sync_fs(file->f_dentry->d_sb, 1); | |
2fad4e83 DS |
5285 | /* |
5286 | * The transaction thread may want to do more work, | |
5287 | * namely it pokes the cleaner ktread that will start | |
5288 | * processing uncleaned subvols. | |
5289 | */ | |
5290 | wake_up_process(root->fs_info->transaction_kthread); | |
9b199859 FDBM |
5291 | return ret; |
5292 | } | |
46204592 | 5293 | case BTRFS_IOC_START_SYNC: |
9a8c28be | 5294 | return btrfs_ioctl_start_sync(root, argp); |
46204592 | 5295 | case BTRFS_IOC_WAIT_SYNC: |
9a8c28be | 5296 | return btrfs_ioctl_wait_sync(root, argp); |
475f6387 | 5297 | case BTRFS_IOC_SCRUB: |
b8e95489 | 5298 | return btrfs_ioctl_scrub(file, argp); |
475f6387 JS |
5299 | case BTRFS_IOC_SCRUB_CANCEL: |
5300 | return btrfs_ioctl_scrub_cancel(root, argp); | |
5301 | case BTRFS_IOC_SCRUB_PROGRESS: | |
5302 | return btrfs_ioctl_scrub_progress(root, argp); | |
c9e9f97b | 5303 | case BTRFS_IOC_BALANCE_V2: |
9ba1f6e4 | 5304 | return btrfs_ioctl_balance(file, argp); |
837d5b6e ID |
5305 | case BTRFS_IOC_BALANCE_CTL: |
5306 | return btrfs_ioctl_balance_ctl(root, arg); | |
19a39dce ID |
5307 | case BTRFS_IOC_BALANCE_PROGRESS: |
5308 | return btrfs_ioctl_balance_progress(root, argp); | |
8ea05e3a AB |
5309 | case BTRFS_IOC_SET_RECEIVED_SUBVOL: |
5310 | return btrfs_ioctl_set_received_subvol(file, argp); | |
abccd00f HM |
5311 | #ifdef CONFIG_64BIT |
5312 | case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: | |
5313 | return btrfs_ioctl_set_received_subvol_32(file, argp); | |
5314 | #endif | |
31db9f7c AB |
5315 | case BTRFS_IOC_SEND: |
5316 | return btrfs_ioctl_send(file, argp); | |
c11d2c23 | 5317 | case BTRFS_IOC_GET_DEV_STATS: |
b27f7c0c | 5318 | return btrfs_ioctl_get_dev_stats(root, argp); |
5d13a37b | 5319 | case BTRFS_IOC_QUOTA_CTL: |
905b0dda | 5320 | return btrfs_ioctl_quota_ctl(file, argp); |
5d13a37b | 5321 | case BTRFS_IOC_QGROUP_ASSIGN: |
905b0dda | 5322 | return btrfs_ioctl_qgroup_assign(file, argp); |
5d13a37b | 5323 | case BTRFS_IOC_QGROUP_CREATE: |
905b0dda | 5324 | return btrfs_ioctl_qgroup_create(file, argp); |
5d13a37b | 5325 | case BTRFS_IOC_QGROUP_LIMIT: |
905b0dda | 5326 | return btrfs_ioctl_qgroup_limit(file, argp); |
2f232036 JS |
5327 | case BTRFS_IOC_QUOTA_RESCAN: |
5328 | return btrfs_ioctl_quota_rescan(file, argp); | |
5329 | case BTRFS_IOC_QUOTA_RESCAN_STATUS: | |
5330 | return btrfs_ioctl_quota_rescan_status(file, argp); | |
57254b6e JS |
5331 | case BTRFS_IOC_QUOTA_RESCAN_WAIT: |
5332 | return btrfs_ioctl_quota_rescan_wait(file, argp); | |
3f6bcfbd SB |
5333 | case BTRFS_IOC_DEV_REPLACE: |
5334 | return btrfs_ioctl_dev_replace(root, argp); | |
867ab667 | 5335 | case BTRFS_IOC_GET_FSLABEL: |
5336 | return btrfs_ioctl_get_fslabel(file, argp); | |
a8bfd4ab | 5337 | case BTRFS_IOC_SET_FSLABEL: |
5338 | return btrfs_ioctl_set_fslabel(file, argp); | |
416161db MF |
5339 | case BTRFS_IOC_FILE_EXTENT_SAME: |
5340 | return btrfs_ioctl_file_extent_same(file, argp); | |
2eaa055f JM |
5341 | case BTRFS_IOC_GET_SUPPORTED_FEATURES: |
5342 | return btrfs_ioctl_get_supported_features(file, argp); | |
5343 | case BTRFS_IOC_GET_FEATURES: | |
5344 | return btrfs_ioctl_get_features(file, argp); | |
5345 | case BTRFS_IOC_SET_FEATURES: | |
5346 | return btrfs_ioctl_set_features(file, argp); | |
f46b5a66 CH |
5347 | } |
5348 | ||
5349 | return -ENOTTY; | |
5350 | } |