This source file includes following definitions.
- btrfs_mask_fsflags_for_type
- btrfs_inode_flags_to_fsflags
- btrfs_sync_inode_flags_to_i_flags
- btrfs_ioctl_getflags
- check_fsflags
- btrfs_ioctl_setflags
- btrfs_inode_flags_to_xflags
- check_xflags
- btrfs_ioctl_fsgetxattr
- btrfs_ioctl_fssetxattr
- btrfs_ioctl_getversion
- btrfs_ioctl_fitrim
- btrfs_is_empty_uuid
- create_subvol
- create_snapshot
- btrfs_may_delete
- btrfs_may_create
- btrfs_mksubvol
- check_defrag_in_cache
- find_new_extents
- defrag_lookup_extent
- defrag_check_next_extent
- should_defrag_range
- cluster_pages_for_defrag
- btrfs_defrag_file
- btrfs_ioctl_resize
- btrfs_ioctl_snap_create_transid
- btrfs_ioctl_snap_create
- btrfs_ioctl_snap_create_v2
- btrfs_ioctl_subvol_getflags
- btrfs_ioctl_subvol_setflags
- key_in_sk
- copy_to_sk
- search_ioctl
- btrfs_ioctl_tree_search
- btrfs_ioctl_tree_search_v2
- btrfs_search_path_in_tree
- btrfs_search_path_in_tree_user
- btrfs_ioctl_ino_lookup
- btrfs_ioctl_ino_lookup_user
- btrfs_ioctl_get_subvol_info
- btrfs_ioctl_get_subvol_rootref
- btrfs_ioctl_snap_destroy
- btrfs_ioctl_defrag
- btrfs_ioctl_add_dev
- btrfs_ioctl_rm_dev_v2
- btrfs_ioctl_rm_dev
- btrfs_ioctl_fs_info
- btrfs_ioctl_dev_info
- btrfs_double_extent_unlock
- btrfs_double_extent_lock
- btrfs_extent_same_range
- btrfs_extent_same
- clone_finish_inode_update
- clone_copy_inline_extent
- btrfs_clone
- btrfs_clone_files
- btrfs_remap_file_range_prep
- btrfs_remap_file_range
- btrfs_ioctl_default_subvol
- get_block_group_info
- btrfs_ioctl_space_info
- btrfs_ioctl_start_sync
- btrfs_ioctl_wait_sync
- btrfs_ioctl_scrub
- btrfs_ioctl_scrub_cancel
- btrfs_ioctl_scrub_progress
- btrfs_ioctl_get_dev_stats
- btrfs_ioctl_dev_replace
- btrfs_ioctl_ino_to_path
- build_ino_list
- btrfs_ioctl_logical_to_ino
- btrfs_update_ioctl_balance_args
- btrfs_ioctl_balance
- btrfs_ioctl_balance_ctl
- btrfs_ioctl_balance_progress
- btrfs_ioctl_quota_ctl
- btrfs_ioctl_qgroup_assign
- btrfs_ioctl_qgroup_create
- btrfs_ioctl_qgroup_limit
- btrfs_ioctl_quota_rescan
- btrfs_ioctl_quota_rescan_status
- btrfs_ioctl_quota_rescan_wait
- _btrfs_ioctl_set_received_subvol
- btrfs_ioctl_set_received_subvol_32
- btrfs_ioctl_set_received_subvol
- btrfs_ioctl_get_fslabel
- btrfs_ioctl_set_fslabel
- btrfs_ioctl_get_supported_features
- btrfs_ioctl_get_features
- check_feature_bits
- btrfs_ioctl_set_features
- _btrfs_ioctl_send
- btrfs_ioctl
- btrfs_compat_ioctl
1
2
3
4
5
6 #include <linux/kernel.h>
7 #include <linux/bio.h>
8 #include <linux/file.h>
9 #include <linux/fs.h>
10 #include <linux/fsnotify.h>
11 #include <linux/pagemap.h>
12 #include <linux/highmem.h>
13 #include <linux/time.h>
14 #include <linux/string.h>
15 #include <linux/backing-dev.h>
16 #include <linux/mount.h>
17 #include <linux/namei.h>
18 #include <linux/writeback.h>
19 #include <linux/compat.h>
20 #include <linux/security.h>
21 #include <linux/xattr.h>
22 #include <linux/mm.h>
23 #include <linux/slab.h>
24 #include <linux/blkdev.h>
25 #include <linux/uuid.h>
26 #include <linux/btrfs.h>
27 #include <linux/uaccess.h>
28 #include <linux/iversion.h>
29 #include "ctree.h"
30 #include "disk-io.h"
31 #include "transaction.h"
32 #include "btrfs_inode.h"
33 #include "print-tree.h"
34 #include "volumes.h"
35 #include "locking.h"
36 #include "inode-map.h"
37 #include "backref.h"
38 #include "rcu-string.h"
39 #include "send.h"
40 #include "dev-replace.h"
41 #include "props.h"
42 #include "sysfs.h"
43 #include "qgroup.h"
44 #include "tree-log.h"
45 #include "compression.h"
46 #include "space-info.h"
47 #include "delalloc-space.h"
48 #include "block-group.h"
49
50 #ifdef CONFIG_64BIT
51
52
53
54
55
56 struct btrfs_ioctl_timespec_32 {
57 __u64 sec;
58 __u32 nsec;
59 } __attribute__ ((__packed__));
60
61 struct btrfs_ioctl_received_subvol_args_32 {
62 char uuid[BTRFS_UUID_SIZE];
63 __u64 stransid;
64 __u64 rtransid;
65 struct btrfs_ioctl_timespec_32 stime;
66 struct btrfs_ioctl_timespec_32 rtime;
67 __u64 flags;
68 __u64 reserved[16];
69 } __attribute__ ((__packed__));
70
71 #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
72 struct btrfs_ioctl_received_subvol_args_32)
73 #endif
74
75 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
76 struct btrfs_ioctl_send_args_32 {
77 __s64 send_fd;
78 __u64 clone_sources_count;
79 compat_uptr_t clone_sources;
80 __u64 parent_root;
81 __u64 flags;
82 __u64 reserved[4];
83 } __attribute__ ((__packed__));
84
85 #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \
86 struct btrfs_ioctl_send_args_32)
87 #endif
88
89 static int btrfs_clone(struct inode *src, struct inode *inode,
90 u64 off, u64 olen, u64 olen_aligned, u64 destoff,
91 int no_time_update);
92
93
94 static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode,
95 unsigned int flags)
96 {
97 if (S_ISDIR(inode->i_mode))
98 return flags;
99 else if (S_ISREG(inode->i_mode))
100 return flags & ~FS_DIRSYNC_FL;
101 else
102 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
103 }
104
105
106
107
108
109 static unsigned int btrfs_inode_flags_to_fsflags(unsigned int flags)
110 {
111 unsigned int iflags = 0;
112
113 if (flags & BTRFS_INODE_SYNC)
114 iflags |= FS_SYNC_FL;
115 if (flags & BTRFS_INODE_IMMUTABLE)
116 iflags |= FS_IMMUTABLE_FL;
117 if (flags & BTRFS_INODE_APPEND)
118 iflags |= FS_APPEND_FL;
119 if (flags & BTRFS_INODE_NODUMP)
120 iflags |= FS_NODUMP_FL;
121 if (flags & BTRFS_INODE_NOATIME)
122 iflags |= FS_NOATIME_FL;
123 if (flags & BTRFS_INODE_DIRSYNC)
124 iflags |= FS_DIRSYNC_FL;
125 if (flags & BTRFS_INODE_NODATACOW)
126 iflags |= FS_NOCOW_FL;
127
128 if (flags & BTRFS_INODE_NOCOMPRESS)
129 iflags |= FS_NOCOMP_FL;
130 else if (flags & BTRFS_INODE_COMPRESS)
131 iflags |= FS_COMPR_FL;
132
133 return iflags;
134 }
135
136
137
138
139 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode)
140 {
141 struct btrfs_inode *binode = BTRFS_I(inode);
142 unsigned int new_fl = 0;
143
144 if (binode->flags & BTRFS_INODE_SYNC)
145 new_fl |= S_SYNC;
146 if (binode->flags & BTRFS_INODE_IMMUTABLE)
147 new_fl |= S_IMMUTABLE;
148 if (binode->flags & BTRFS_INODE_APPEND)
149 new_fl |= S_APPEND;
150 if (binode->flags & BTRFS_INODE_NOATIME)
151 new_fl |= S_NOATIME;
152 if (binode->flags & BTRFS_INODE_DIRSYNC)
153 new_fl |= S_DIRSYNC;
154
155 set_mask_bits(&inode->i_flags,
156 S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC,
157 new_fl);
158 }
159
160 static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
161 {
162 struct btrfs_inode *binode = BTRFS_I(file_inode(file));
163 unsigned int flags = btrfs_inode_flags_to_fsflags(binode->flags);
164
165 if (copy_to_user(arg, &flags, sizeof(flags)))
166 return -EFAULT;
167 return 0;
168 }
169
170
171 static int check_fsflags(unsigned int flags)
172 {
173 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
174 FS_NOATIME_FL | FS_NODUMP_FL | \
175 FS_SYNC_FL | FS_DIRSYNC_FL | \
176 FS_NOCOMP_FL | FS_COMPR_FL |
177 FS_NOCOW_FL))
178 return -EOPNOTSUPP;
179
180 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
181 return -EINVAL;
182
183 return 0;
184 }
185
186 static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
187 {
188 struct inode *inode = file_inode(file);
189 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
190 struct btrfs_inode *binode = BTRFS_I(inode);
191 struct btrfs_root *root = binode->root;
192 struct btrfs_trans_handle *trans;
193 unsigned int fsflags, old_fsflags;
194 int ret;
195 const char *comp = NULL;
196 u32 binode_flags = binode->flags;
197
198 if (!inode_owner_or_capable(inode))
199 return -EPERM;
200
201 if (btrfs_root_readonly(root))
202 return -EROFS;
203
204 if (copy_from_user(&fsflags, arg, sizeof(fsflags)))
205 return -EFAULT;
206
207 ret = check_fsflags(fsflags);
208 if (ret)
209 return ret;
210
211 ret = mnt_want_write_file(file);
212 if (ret)
213 return ret;
214
215 inode_lock(inode);
216
217 fsflags = btrfs_mask_fsflags_for_type(inode, fsflags);
218 old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags);
219 ret = vfs_ioc_setflags_prepare(inode, old_fsflags, fsflags);
220 if (ret)
221 goto out_unlock;
222
223 if (fsflags & FS_SYNC_FL)
224 binode_flags |= BTRFS_INODE_SYNC;
225 else
226 binode_flags &= ~BTRFS_INODE_SYNC;
227 if (fsflags & FS_IMMUTABLE_FL)
228 binode_flags |= BTRFS_INODE_IMMUTABLE;
229 else
230 binode_flags &= ~BTRFS_INODE_IMMUTABLE;
231 if (fsflags & FS_APPEND_FL)
232 binode_flags |= BTRFS_INODE_APPEND;
233 else
234 binode_flags &= ~BTRFS_INODE_APPEND;
235 if (fsflags & FS_NODUMP_FL)
236 binode_flags |= BTRFS_INODE_NODUMP;
237 else
238 binode_flags &= ~BTRFS_INODE_NODUMP;
239 if (fsflags & FS_NOATIME_FL)
240 binode_flags |= BTRFS_INODE_NOATIME;
241 else
242 binode_flags &= ~BTRFS_INODE_NOATIME;
243 if (fsflags & FS_DIRSYNC_FL)
244 binode_flags |= BTRFS_INODE_DIRSYNC;
245 else
246 binode_flags &= ~BTRFS_INODE_DIRSYNC;
247 if (fsflags & FS_NOCOW_FL) {
248 if (S_ISREG(inode->i_mode)) {
249
250
251
252
253
254 if (inode->i_size == 0)
255 binode_flags |= BTRFS_INODE_NODATACOW |
256 BTRFS_INODE_NODATASUM;
257 } else {
258 binode_flags |= BTRFS_INODE_NODATACOW;
259 }
260 } else {
261
262
263
264 if (S_ISREG(inode->i_mode)) {
265 if (inode->i_size == 0)
266 binode_flags &= ~(BTRFS_INODE_NODATACOW |
267 BTRFS_INODE_NODATASUM);
268 } else {
269 binode_flags &= ~BTRFS_INODE_NODATACOW;
270 }
271 }
272
273
274
275
276
277
278 if (fsflags & FS_NOCOMP_FL) {
279 binode_flags &= ~BTRFS_INODE_COMPRESS;
280 binode_flags |= BTRFS_INODE_NOCOMPRESS;
281 } else if (fsflags & FS_COMPR_FL) {
282
283 if (IS_SWAPFILE(inode)) {
284 ret = -ETXTBSY;
285 goto out_unlock;
286 }
287
288 binode_flags |= BTRFS_INODE_COMPRESS;
289 binode_flags &= ~BTRFS_INODE_NOCOMPRESS;
290
291 comp = btrfs_compress_type2str(fs_info->compress_type);
292 if (!comp || comp[0] == 0)
293 comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB);
294 } else {
295 binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
296 }
297
298
299
300
301
302 trans = btrfs_start_transaction(root, 3);
303 if (IS_ERR(trans)) {
304 ret = PTR_ERR(trans);
305 goto out_unlock;
306 }
307
308 if (comp) {
309 ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp,
310 strlen(comp), 0);
311 if (ret) {
312 btrfs_abort_transaction(trans, ret);
313 goto out_end_trans;
314 }
315 } else {
316 ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL,
317 0, 0);
318 if (ret && ret != -ENODATA) {
319 btrfs_abort_transaction(trans, ret);
320 goto out_end_trans;
321 }
322 }
323
324 binode->flags = binode_flags;
325 btrfs_sync_inode_flags_to_i_flags(inode);
326 inode_inc_iversion(inode);
327 inode->i_ctime = current_time(inode);
328 ret = btrfs_update_inode(trans, root, inode);
329
330 out_end_trans:
331 btrfs_end_transaction(trans);
332 out_unlock:
333 inode_unlock(inode);
334 mnt_drop_write_file(file);
335 return ret;
336 }
337
338
339
340
341
342
343 static unsigned int btrfs_inode_flags_to_xflags(unsigned int flags)
344 {
345 unsigned int xflags = 0;
346
347 if (flags & BTRFS_INODE_APPEND)
348 xflags |= FS_XFLAG_APPEND;
349 if (flags & BTRFS_INODE_IMMUTABLE)
350 xflags |= FS_XFLAG_IMMUTABLE;
351 if (flags & BTRFS_INODE_NOATIME)
352 xflags |= FS_XFLAG_NOATIME;
353 if (flags & BTRFS_INODE_NODUMP)
354 xflags |= FS_XFLAG_NODUMP;
355 if (flags & BTRFS_INODE_SYNC)
356 xflags |= FS_XFLAG_SYNC;
357
358 return xflags;
359 }
360
361
362 static int check_xflags(unsigned int flags)
363 {
364 if (flags & ~(FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE | FS_XFLAG_NOATIME |
365 FS_XFLAG_NODUMP | FS_XFLAG_SYNC))
366 return -EOPNOTSUPP;
367 return 0;
368 }
369
370
371
372
373
374 static int btrfs_ioctl_fsgetxattr(struct file *file, void __user *arg)
375 {
376 struct btrfs_inode *binode = BTRFS_I(file_inode(file));
377 struct fsxattr fa;
378
379 simple_fill_fsxattr(&fa, btrfs_inode_flags_to_xflags(binode->flags));
380 if (copy_to_user(arg, &fa, sizeof(fa)))
381 return -EFAULT;
382
383 return 0;
384 }
385
386 static int btrfs_ioctl_fssetxattr(struct file *file, void __user *arg)
387 {
388 struct inode *inode = file_inode(file);
389 struct btrfs_inode *binode = BTRFS_I(inode);
390 struct btrfs_root *root = binode->root;
391 struct btrfs_trans_handle *trans;
392 struct fsxattr fa, old_fa;
393 unsigned old_flags;
394 unsigned old_i_flags;
395 int ret = 0;
396
397 if (!inode_owner_or_capable(inode))
398 return -EPERM;
399
400 if (btrfs_root_readonly(root))
401 return -EROFS;
402
403 if (copy_from_user(&fa, arg, sizeof(fa)))
404 return -EFAULT;
405
406 ret = check_xflags(fa.fsx_xflags);
407 if (ret)
408 return ret;
409
410 if (fa.fsx_extsize != 0 || fa.fsx_projid != 0 || fa.fsx_cowextsize != 0)
411 return -EOPNOTSUPP;
412
413 ret = mnt_want_write_file(file);
414 if (ret)
415 return ret;
416
417 inode_lock(inode);
418
419 old_flags = binode->flags;
420 old_i_flags = inode->i_flags;
421
422 simple_fill_fsxattr(&old_fa,
423 btrfs_inode_flags_to_xflags(binode->flags));
424 ret = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa);
425 if (ret)
426 goto out_unlock;
427
428 if (fa.fsx_xflags & FS_XFLAG_SYNC)
429 binode->flags |= BTRFS_INODE_SYNC;
430 else
431 binode->flags &= ~BTRFS_INODE_SYNC;
432 if (fa.fsx_xflags & FS_XFLAG_IMMUTABLE)
433 binode->flags |= BTRFS_INODE_IMMUTABLE;
434 else
435 binode->flags &= ~BTRFS_INODE_IMMUTABLE;
436 if (fa.fsx_xflags & FS_XFLAG_APPEND)
437 binode->flags |= BTRFS_INODE_APPEND;
438 else
439 binode->flags &= ~BTRFS_INODE_APPEND;
440 if (fa.fsx_xflags & FS_XFLAG_NODUMP)
441 binode->flags |= BTRFS_INODE_NODUMP;
442 else
443 binode->flags &= ~BTRFS_INODE_NODUMP;
444 if (fa.fsx_xflags & FS_XFLAG_NOATIME)
445 binode->flags |= BTRFS_INODE_NOATIME;
446 else
447 binode->flags &= ~BTRFS_INODE_NOATIME;
448
449
450 trans = btrfs_start_transaction(root, 1);
451 if (IS_ERR(trans)) {
452 ret = PTR_ERR(trans);
453 goto out_unlock;
454 }
455
456 btrfs_sync_inode_flags_to_i_flags(inode);
457 inode_inc_iversion(inode);
458 inode->i_ctime = current_time(inode);
459 ret = btrfs_update_inode(trans, root, inode);
460
461 btrfs_end_transaction(trans);
462
463 out_unlock:
464 if (ret) {
465 binode->flags = old_flags;
466 inode->i_flags = old_i_flags;
467 }
468
469 inode_unlock(inode);
470 mnt_drop_write_file(file);
471
472 return ret;
473 }
474
475 static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
476 {
477 struct inode *inode = file_inode(file);
478
479 return put_user(inode->i_generation, arg);
480 }
481
482 static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
483 {
484 struct inode *inode = file_inode(file);
485 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
486 struct btrfs_device *device;
487 struct request_queue *q;
488 struct fstrim_range range;
489 u64 minlen = ULLONG_MAX;
490 u64 num_devices = 0;
491 int ret;
492
493 if (!capable(CAP_SYS_ADMIN))
494 return -EPERM;
495
496
497
498
499
500
501
502
503 if (btrfs_test_opt(fs_info, NOLOGREPLAY))
504 return -EROFS;
505
506 rcu_read_lock();
507 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
508 dev_list) {
509 if (!device->bdev)
510 continue;
511 q = bdev_get_queue(device->bdev);
512 if (blk_queue_discard(q)) {
513 num_devices++;
514 minlen = min_t(u64, q->limits.discard_granularity,
515 minlen);
516 }
517 }
518 rcu_read_unlock();
519
520 if (!num_devices)
521 return -EOPNOTSUPP;
522 if (copy_from_user(&range, arg, sizeof(range)))
523 return -EFAULT;
524
525
526
527
528
529
530 if (range.len < fs_info->sb->s_blocksize)
531 return -EINVAL;
532
533 range.minlen = max(range.minlen, minlen);
534 ret = btrfs_trim_fs(fs_info, &range);
535 if (ret < 0)
536 return ret;
537
538 if (copy_to_user(arg, &range, sizeof(range)))
539 return -EFAULT;
540
541 return 0;
542 }
543
544 int btrfs_is_empty_uuid(u8 *uuid)
545 {
546 int i;
547
548 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
549 if (uuid[i])
550 return 0;
551 }
552 return 1;
553 }
554
555 static noinline int create_subvol(struct inode *dir,
556 struct dentry *dentry,
557 const char *name, int namelen,
558 u64 *async_transid,
559 struct btrfs_qgroup_inherit *inherit)
560 {
561 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
562 struct btrfs_trans_handle *trans;
563 struct btrfs_key key;
564 struct btrfs_root_item *root_item;
565 struct btrfs_inode_item *inode_item;
566 struct extent_buffer *leaf;
567 struct btrfs_root *root = BTRFS_I(dir)->root;
568 struct btrfs_root *new_root;
569 struct btrfs_block_rsv block_rsv;
570 struct timespec64 cur_time = current_time(dir);
571 struct inode *inode;
572 int ret;
573 int err;
574 u64 objectid;
575 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
576 u64 index = 0;
577 uuid_le new_uuid;
578
579 root_item = kzalloc(sizeof(*root_item), GFP_KERNEL);
580 if (!root_item)
581 return -ENOMEM;
582
583 ret = btrfs_find_free_objectid(fs_info->tree_root, &objectid);
584 if (ret)
585 goto fail_free;
586
587
588
589
590
591 if (btrfs_qgroup_level(objectid)) {
592 ret = -ENOSPC;
593 goto fail_free;
594 }
595
596 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
597
598
599
600
601 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false);
602 if (ret)
603 goto fail_free;
604
605 trans = btrfs_start_transaction(root, 0);
606 if (IS_ERR(trans)) {
607 ret = PTR_ERR(trans);
608 btrfs_subvolume_release_metadata(fs_info, &block_rsv);
609 goto fail_free;
610 }
611 trans->block_rsv = &block_rsv;
612 trans->bytes_reserved = block_rsv.size;
613
614 ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit);
615 if (ret)
616 goto fail;
617
618 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0);
619 if (IS_ERR(leaf)) {
620 ret = PTR_ERR(leaf);
621 goto fail;
622 }
623
624 btrfs_mark_buffer_dirty(leaf);
625
626 inode_item = &root_item->inode;
627 btrfs_set_stack_inode_generation(inode_item, 1);
628 btrfs_set_stack_inode_size(inode_item, 3);
629 btrfs_set_stack_inode_nlink(inode_item, 1);
630 btrfs_set_stack_inode_nbytes(inode_item,
631 fs_info->nodesize);
632 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
633
634 btrfs_set_root_flags(root_item, 0);
635 btrfs_set_root_limit(root_item, 0);
636 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
637
638 btrfs_set_root_bytenr(root_item, leaf->start);
639 btrfs_set_root_generation(root_item, trans->transid);
640 btrfs_set_root_level(root_item, 0);
641 btrfs_set_root_refs(root_item, 1);
642 btrfs_set_root_used(root_item, leaf->len);
643 btrfs_set_root_last_snapshot(root_item, 0);
644
645 btrfs_set_root_generation_v2(root_item,
646 btrfs_root_generation(root_item));
647 uuid_le_gen(&new_uuid);
648 memcpy(root_item->uuid, new_uuid.b, BTRFS_UUID_SIZE);
649 btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec);
650 btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec);
651 root_item->ctime = root_item->otime;
652 btrfs_set_root_ctransid(root_item, trans->transid);
653 btrfs_set_root_otransid(root_item, trans->transid);
654
655 btrfs_tree_unlock(leaf);
656 free_extent_buffer(leaf);
657 leaf = NULL;
658
659 btrfs_set_root_dirid(root_item, new_dirid);
660
661 key.objectid = objectid;
662 key.offset = 0;
663 key.type = BTRFS_ROOT_ITEM_KEY;
664 ret = btrfs_insert_root(trans, fs_info->tree_root, &key,
665 root_item);
666 if (ret)
667 goto fail;
668
669 key.offset = (u64)-1;
670 new_root = btrfs_read_fs_root_no_name(fs_info, &key);
671 if (IS_ERR(new_root)) {
672 ret = PTR_ERR(new_root);
673 btrfs_abort_transaction(trans, ret);
674 goto fail;
675 }
676
677 btrfs_record_root_in_trans(trans, new_root);
678
679 ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid);
680 if (ret) {
681
682 btrfs_abort_transaction(trans, ret);
683 goto fail;
684 }
685
686 mutex_lock(&new_root->objectid_mutex);
687 new_root->highest_objectid = new_dirid;
688 mutex_unlock(&new_root->objectid_mutex);
689
690
691
692
693 ret = btrfs_set_inode_index(BTRFS_I(dir), &index);
694 if (ret) {
695 btrfs_abort_transaction(trans, ret);
696 goto fail;
697 }
698
699 ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key,
700 BTRFS_FT_DIR, index);
701 if (ret) {
702 btrfs_abort_transaction(trans, ret);
703 goto fail;
704 }
705
706 btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2);
707 ret = btrfs_update_inode(trans, root, dir);
708 if (ret) {
709 btrfs_abort_transaction(trans, ret);
710 goto fail;
711 }
712
713 ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid,
714 btrfs_ino(BTRFS_I(dir)), index, name, namelen);
715 if (ret) {
716 btrfs_abort_transaction(trans, ret);
717 goto fail;
718 }
719
720 ret = btrfs_uuid_tree_add(trans, root_item->uuid,
721 BTRFS_UUID_KEY_SUBVOL, objectid);
722 if (ret)
723 btrfs_abort_transaction(trans, ret);
724
725 fail:
726 kfree(root_item);
727 trans->block_rsv = NULL;
728 trans->bytes_reserved = 0;
729 btrfs_subvolume_release_metadata(fs_info, &block_rsv);
730
731 if (async_transid) {
732 *async_transid = trans->transid;
733 err = btrfs_commit_transaction_async(trans, 1);
734 if (err)
735 err = btrfs_commit_transaction(trans);
736 } else {
737 err = btrfs_commit_transaction(trans);
738 }
739 if (err && !ret)
740 ret = err;
741
742 if (!ret) {
743 inode = btrfs_lookup_dentry(dir, dentry);
744 if (IS_ERR(inode))
745 return PTR_ERR(inode);
746 d_instantiate(dentry, inode);
747 }
748 return ret;
749
750 fail_free:
751 kfree(root_item);
752 return ret;
753 }
754
755 static int create_snapshot(struct btrfs_root *root, struct inode *dir,
756 struct dentry *dentry,
757 u64 *async_transid, bool readonly,
758 struct btrfs_qgroup_inherit *inherit)
759 {
760 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
761 struct inode *inode;
762 struct btrfs_pending_snapshot *pending_snapshot;
763 struct btrfs_trans_handle *trans;
764 int ret;
765 bool snapshot_force_cow = false;
766
767 if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
768 return -EINVAL;
769
770 if (atomic_read(&root->nr_swapfiles)) {
771 btrfs_warn(fs_info,
772 "cannot snapshot subvolume with active swapfile");
773 return -ETXTBSY;
774 }
775
776 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL);
777 if (!pending_snapshot)
778 return -ENOMEM;
779
780 pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
781 GFP_KERNEL);
782 pending_snapshot->path = btrfs_alloc_path();
783 if (!pending_snapshot->root_item || !pending_snapshot->path) {
784 ret = -ENOMEM;
785 goto free_pending;
786 }
787
788
789
790
791
792
793 atomic_inc(&root->will_be_snapshotted);
794 smp_mb__after_atomic();
795
796 wait_event(root->subv_writers->wait,
797 percpu_counter_sum(&root->subv_writers->counter) == 0);
798
799 ret = btrfs_start_delalloc_snapshot(root);
800 if (ret)
801 goto dec_and_free;
802
803
804
805
806
807
808 atomic_inc(&root->snapshot_force_cow);
809 snapshot_force_cow = true;
810
811 btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1);
812
813 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
814 BTRFS_BLOCK_RSV_TEMP);
815
816
817
818
819
820
821
822
823 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
824 &pending_snapshot->block_rsv, 8,
825 false);
826 if (ret)
827 goto dec_and_free;
828
829 pending_snapshot->dentry = dentry;
830 pending_snapshot->root = root;
831 pending_snapshot->readonly = readonly;
832 pending_snapshot->dir = dir;
833 pending_snapshot->inherit = inherit;
834
835 trans = btrfs_start_transaction(root, 0);
836 if (IS_ERR(trans)) {
837 ret = PTR_ERR(trans);
838 goto fail;
839 }
840
841 spin_lock(&fs_info->trans_lock);
842 list_add(&pending_snapshot->list,
843 &trans->transaction->pending_snapshots);
844 spin_unlock(&fs_info->trans_lock);
845 if (async_transid) {
846 *async_transid = trans->transid;
847 ret = btrfs_commit_transaction_async(trans, 1);
848 if (ret)
849 ret = btrfs_commit_transaction(trans);
850 } else {
851 ret = btrfs_commit_transaction(trans);
852 }
853 if (ret)
854 goto fail;
855
856 ret = pending_snapshot->error;
857 if (ret)
858 goto fail;
859
860 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
861 if (ret)
862 goto fail;
863
864 inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry);
865 if (IS_ERR(inode)) {
866 ret = PTR_ERR(inode);
867 goto fail;
868 }
869
870 d_instantiate(dentry, inode);
871 ret = 0;
872 fail:
873 btrfs_subvolume_release_metadata(fs_info, &pending_snapshot->block_rsv);
874 dec_and_free:
875 if (snapshot_force_cow)
876 atomic_dec(&root->snapshot_force_cow);
877 if (atomic_dec_and_test(&root->will_be_snapshotted))
878 wake_up_var(&root->will_be_snapshotted);
879 free_pending:
880 kfree(pending_snapshot->root_item);
881 btrfs_free_path(pending_snapshot->path);
882 kfree(pending_snapshot);
883
884 return ret;
885 }
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907 static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
908 {
909 int error;
910
911 if (d_really_is_negative(victim))
912 return -ENOENT;
913
914 BUG_ON(d_inode(victim->d_parent) != dir);
915 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
916
917 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
918 if (error)
919 return error;
920 if (IS_APPEND(dir))
921 return -EPERM;
922 if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) ||
923 IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim)))
924 return -EPERM;
925 if (isdir) {
926 if (!d_is_dir(victim))
927 return -ENOTDIR;
928 if (IS_ROOT(victim))
929 return -EBUSY;
930 } else if (d_is_dir(victim))
931 return -EISDIR;
932 if (IS_DEADDIR(dir))
933 return -ENOENT;
934 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
935 return -EBUSY;
936 return 0;
937 }
938
939
940 static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
941 {
942 if (d_really_is_positive(child))
943 return -EEXIST;
944 if (IS_DEADDIR(dir))
945 return -ENOENT;
946 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
947 }
948
949
950
951
952
953
954 static noinline int btrfs_mksubvol(const struct path *parent,
955 const char *name, int namelen,
956 struct btrfs_root *snap_src,
957 u64 *async_transid, bool readonly,
958 struct btrfs_qgroup_inherit *inherit)
959 {
960 struct inode *dir = d_inode(parent->dentry);
961 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
962 struct dentry *dentry;
963 int error;
964
965 error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
966 if (error == -EINTR)
967 return error;
968
969 dentry = lookup_one_len(name, parent->dentry, namelen);
970 error = PTR_ERR(dentry);
971 if (IS_ERR(dentry))
972 goto out_unlock;
973
974 error = btrfs_may_create(dir, dentry);
975 if (error)
976 goto out_dput;
977
978
979
980
981
982 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
983 dir->i_ino, name,
984 namelen);
985 if (error)
986 goto out_dput;
987
988 down_read(&fs_info->subvol_sem);
989
990 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
991 goto out_up_read;
992
993 if (snap_src) {
994 error = create_snapshot(snap_src, dir, dentry,
995 async_transid, readonly, inherit);
996 } else {
997 error = create_subvol(dir, dentry, name, namelen,
998 async_transid, inherit);
999 }
1000 if (!error)
1001 fsnotify_mkdir(dir, dentry);
1002 out_up_read:
1003 up_read(&fs_info->subvol_sem);
1004 out_dput:
1005 dput(dentry);
1006 out_unlock:
1007 inode_unlock(dir);
1008 return error;
1009 }
1010
1011
1012
1013
1014
1015
1016
1017
1018 static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh)
1019 {
1020 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1021 struct extent_map *em = NULL;
1022 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1023 u64 end;
1024
1025 read_lock(&em_tree->lock);
1026 em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE);
1027 read_unlock(&em_tree->lock);
1028
1029 if (em) {
1030 end = extent_map_end(em);
1031 free_extent_map(em);
1032 if (end - offset > thresh)
1033 return 0;
1034 }
1035
1036 thresh /= 2;
1037 end = count_range_bits(io_tree, &offset, offset + thresh,
1038 thresh, EXTENT_DELALLOC, 1);
1039 if (end >= thresh)
1040 return 0;
1041 return 1;
1042 }
1043
1044
1045
1046
1047
1048
1049
1050
1051 static int find_new_extents(struct btrfs_root *root,
1052 struct inode *inode, u64 newer_than,
1053 u64 *off, u32 thresh)
1054 {
1055 struct btrfs_path *path;
1056 struct btrfs_key min_key;
1057 struct extent_buffer *leaf;
1058 struct btrfs_file_extent_item *extent;
1059 int type;
1060 int ret;
1061 u64 ino = btrfs_ino(BTRFS_I(inode));
1062
1063 path = btrfs_alloc_path();
1064 if (!path)
1065 return -ENOMEM;
1066
1067 min_key.objectid = ino;
1068 min_key.type = BTRFS_EXTENT_DATA_KEY;
1069 min_key.offset = *off;
1070
1071 while (1) {
1072 ret = btrfs_search_forward(root, &min_key, path, newer_than);
1073 if (ret != 0)
1074 goto none;
1075 process_slot:
1076 if (min_key.objectid != ino)
1077 goto none;
1078 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
1079 goto none;
1080
1081 leaf = path->nodes[0];
1082 extent = btrfs_item_ptr(leaf, path->slots[0],
1083 struct btrfs_file_extent_item);
1084
1085 type = btrfs_file_extent_type(leaf, extent);
1086 if (type == BTRFS_FILE_EXTENT_REG &&
1087 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
1088 check_defrag_in_cache(inode, min_key.offset, thresh)) {
1089 *off = min_key.offset;
1090 btrfs_free_path(path);
1091 return 0;
1092 }
1093
1094 path->slots[0]++;
1095 if (path->slots[0] < btrfs_header_nritems(leaf)) {
1096 btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]);
1097 goto process_slot;
1098 }
1099
1100 if (min_key.offset == (u64)-1)
1101 goto none;
1102
1103 min_key.offset++;
1104 btrfs_release_path(path);
1105 }
1106 none:
1107 btrfs_free_path(path);
1108 return -ENOENT;
1109 }
1110
1111 static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
1112 {
1113 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1114 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1115 struct extent_map *em;
1116 u64 len = PAGE_SIZE;
1117
1118
1119
1120
1121
1122 read_lock(&em_tree->lock);
1123 em = lookup_extent_mapping(em_tree, start, len);
1124 read_unlock(&em_tree->lock);
1125
1126 if (!em) {
1127 struct extent_state *cached = NULL;
1128 u64 end = start + len - 1;
1129
1130
1131 lock_extent_bits(io_tree, start, end, &cached);
1132 em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len, 0);
1133 unlock_extent_cached(io_tree, start, end, &cached);
1134
1135 if (IS_ERR(em))
1136 return NULL;
1137 }
1138
1139 return em;
1140 }
1141
1142 static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
1143 {
1144 struct extent_map *next;
1145 bool ret = true;
1146
1147
1148 if (em->start + em->len >= i_size_read(inode))
1149 return false;
1150
1151 next = defrag_lookup_extent(inode, em->start + em->len);
1152 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
1153 ret = false;
1154 else if ((em->block_start + em->block_len == next->block_start) &&
1155 (em->block_len > SZ_128K && next->block_len > SZ_128K))
1156 ret = false;
1157
1158 free_extent_map(next);
1159 return ret;
1160 }
1161
1162 static int should_defrag_range(struct inode *inode, u64 start, u32 thresh,
1163 u64 *last_len, u64 *skip, u64 *defrag_end,
1164 int compress)
1165 {
1166 struct extent_map *em;
1167 int ret = 1;
1168 bool next_mergeable = true;
1169 bool prev_mergeable = true;
1170
1171
1172
1173
1174
1175 if (start < *defrag_end)
1176 return 1;
1177
1178 *skip = 0;
1179
1180 em = defrag_lookup_extent(inode, start);
1181 if (!em)
1182 return 0;
1183
1184
1185 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
1186 ret = 0;
1187 goto out;
1188 }
1189
1190 if (!*defrag_end)
1191 prev_mergeable = false;
1192
1193 next_mergeable = defrag_check_next_extent(inode, em);
1194
1195
1196
1197
1198 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
1199 (em->len >= thresh || (!next_mergeable && !prev_mergeable)))
1200 ret = 0;
1201 out:
1202
1203
1204
1205
1206
1207
1208
1209
1210 if (ret) {
1211 *defrag_end = extent_map_end(em);
1212 } else {
1213 *last_len = 0;
1214 *skip = extent_map_end(em);
1215 *defrag_end = 0;
1216 }
1217
1218 free_extent_map(em);
1219 return ret;
1220 }
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234 static int cluster_pages_for_defrag(struct inode *inode,
1235 struct page **pages,
1236 unsigned long start_index,
1237 unsigned long num_pages)
1238 {
1239 unsigned long file_end;
1240 u64 isize = i_size_read(inode);
1241 u64 page_start;
1242 u64 page_end;
1243 u64 page_cnt;
1244 int ret;
1245 int i;
1246 int i_done;
1247 struct btrfs_ordered_extent *ordered;
1248 struct extent_state *cached_state = NULL;
1249 struct extent_io_tree *tree;
1250 struct extent_changeset *data_reserved = NULL;
1251 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
1252
1253 file_end = (isize - 1) >> PAGE_SHIFT;
1254 if (!isize || start_index > file_end)
1255 return 0;
1256
1257 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
1258
1259 ret = btrfs_delalloc_reserve_space(inode, &data_reserved,
1260 start_index << PAGE_SHIFT,
1261 page_cnt << PAGE_SHIFT);
1262 if (ret)
1263 return ret;
1264 i_done = 0;
1265 tree = &BTRFS_I(inode)->io_tree;
1266
1267
1268 for (i = 0; i < page_cnt; i++) {
1269 struct page *page;
1270 again:
1271 page = find_or_create_page(inode->i_mapping,
1272 start_index + i, mask);
1273 if (!page)
1274 break;
1275
1276 page_start = page_offset(page);
1277 page_end = page_start + PAGE_SIZE - 1;
1278 while (1) {
1279 lock_extent_bits(tree, page_start, page_end,
1280 &cached_state);
1281 ordered = btrfs_lookup_ordered_extent(inode,
1282 page_start);
1283 unlock_extent_cached(tree, page_start, page_end,
1284 &cached_state);
1285 if (!ordered)
1286 break;
1287
1288 unlock_page(page);
1289 btrfs_start_ordered_extent(inode, ordered, 1);
1290 btrfs_put_ordered_extent(ordered);
1291 lock_page(page);
1292
1293
1294
1295
1296 if (page->mapping != inode->i_mapping) {
1297 unlock_page(page);
1298 put_page(page);
1299 goto again;
1300 }
1301 }
1302
1303 if (!PageUptodate(page)) {
1304 btrfs_readpage(NULL, page);
1305 lock_page(page);
1306 if (!PageUptodate(page)) {
1307 unlock_page(page);
1308 put_page(page);
1309 ret = -EIO;
1310 break;
1311 }
1312 }
1313
1314 if (page->mapping != inode->i_mapping) {
1315 unlock_page(page);
1316 put_page(page);
1317 goto again;
1318 }
1319
1320 pages[i] = page;
1321 i_done++;
1322 }
1323 if (!i_done || ret)
1324 goto out;
1325
1326 if (!(inode->i_sb->s_flags & SB_ACTIVE))
1327 goto out;
1328
1329
1330
1331
1332
1333 for (i = 0; i < i_done; i++)
1334 wait_on_page_writeback(pages[i]);
1335
1336 page_start = page_offset(pages[0]);
1337 page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE;
1338
1339 lock_extent_bits(&BTRFS_I(inode)->io_tree,
1340 page_start, page_end - 1, &cached_state);
1341 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1342 page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING |
1343 EXTENT_DEFRAG, 0, 0, &cached_state);
1344
1345 if (i_done != page_cnt) {
1346 spin_lock(&BTRFS_I(inode)->lock);
1347 btrfs_mod_outstanding_extents(BTRFS_I(inode), 1);
1348 spin_unlock(&BTRFS_I(inode)->lock);
1349 btrfs_delalloc_release_space(inode, data_reserved,
1350 start_index << PAGE_SHIFT,
1351 (page_cnt - i_done) << PAGE_SHIFT, true);
1352 }
1353
1354
1355 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1356 &cached_state);
1357
1358 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1359 page_start, page_end - 1, &cached_state);
1360
1361 for (i = 0; i < i_done; i++) {
1362 clear_page_dirty_for_io(pages[i]);
1363 ClearPageChecked(pages[i]);
1364 set_page_extent_mapped(pages[i]);
1365 set_page_dirty(pages[i]);
1366 unlock_page(pages[i]);
1367 put_page(pages[i]);
1368 }
1369 btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT);
1370 extent_changeset_free(data_reserved);
1371 return i_done;
1372 out:
1373 for (i = 0; i < i_done; i++) {
1374 unlock_page(pages[i]);
1375 put_page(pages[i]);
1376 }
1377 btrfs_delalloc_release_space(inode, data_reserved,
1378 start_index << PAGE_SHIFT,
1379 page_cnt << PAGE_SHIFT, true);
1380 btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT);
1381 extent_changeset_free(data_reserved);
1382 return ret;
1383
1384 }
1385
1386 int btrfs_defrag_file(struct inode *inode, struct file *file,
1387 struct btrfs_ioctl_defrag_range_args *range,
1388 u64 newer_than, unsigned long max_to_defrag)
1389 {
1390 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1391 struct btrfs_root *root = BTRFS_I(inode)->root;
1392 struct file_ra_state *ra = NULL;
1393 unsigned long last_index;
1394 u64 isize = i_size_read(inode);
1395 u64 last_len = 0;
1396 u64 skip = 0;
1397 u64 defrag_end = 0;
1398 u64 newer_off = range->start;
1399 unsigned long i;
1400 unsigned long ra_index = 0;
1401 int ret;
1402 int defrag_count = 0;
1403 int compress_type = BTRFS_COMPRESS_ZLIB;
1404 u32 extent_thresh = range->extent_thresh;
1405 unsigned long max_cluster = SZ_256K >> PAGE_SHIFT;
1406 unsigned long cluster = max_cluster;
1407 u64 new_align = ~((u64)SZ_128K - 1);
1408 struct page **pages = NULL;
1409 bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS;
1410
1411 if (isize == 0)
1412 return 0;
1413
1414 if (range->start >= isize)
1415 return -EINVAL;
1416
1417 if (do_compress) {
1418 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1419 return -EINVAL;
1420 if (range->compress_type)
1421 compress_type = range->compress_type;
1422 }
1423
1424 if (extent_thresh == 0)
1425 extent_thresh = SZ_256K;
1426
1427
1428
1429
1430
1431
1432 if (!file) {
1433 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
1434 if (ra)
1435 file_ra_state_init(ra, inode->i_mapping);
1436 } else {
1437 ra = &file->f_ra;
1438 }
1439
1440 pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL);
1441 if (!pages) {
1442 ret = -ENOMEM;
1443 goto out_ra;
1444 }
1445
1446
1447 if (range->start + range->len > range->start) {
1448 last_index = min_t(u64, isize - 1,
1449 range->start + range->len - 1) >> PAGE_SHIFT;
1450 } else {
1451 last_index = (isize - 1) >> PAGE_SHIFT;
1452 }
1453
1454 if (newer_than) {
1455 ret = find_new_extents(root, inode, newer_than,
1456 &newer_off, SZ_64K);
1457 if (!ret) {
1458 range->start = newer_off;
1459
1460
1461
1462
1463 i = (newer_off & new_align) >> PAGE_SHIFT;
1464 } else
1465 goto out_ra;
1466 } else {
1467 i = range->start >> PAGE_SHIFT;
1468 }
1469 if (!max_to_defrag)
1470 max_to_defrag = last_index - i + 1;
1471
1472
1473
1474
1475
1476 if (i < inode->i_mapping->writeback_index)
1477 inode->i_mapping->writeback_index = i;
1478
1479 while (i <= last_index && defrag_count < max_to_defrag &&
1480 (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) {
1481
1482
1483
1484
1485 if (!(inode->i_sb->s_flags & SB_ACTIVE))
1486 break;
1487
1488 if (btrfs_defrag_cancelled(fs_info)) {
1489 btrfs_debug(fs_info, "defrag_file cancelled");
1490 ret = -EAGAIN;
1491 break;
1492 }
1493
1494 if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT,
1495 extent_thresh, &last_len, &skip,
1496 &defrag_end, do_compress)){
1497 unsigned long next;
1498
1499
1500
1501
1502 next = DIV_ROUND_UP(skip, PAGE_SIZE);
1503 i = max(i + 1, next);
1504 continue;
1505 }
1506
1507 if (!newer_than) {
1508 cluster = (PAGE_ALIGN(defrag_end) >>
1509 PAGE_SHIFT) - i;
1510 cluster = min(cluster, max_cluster);
1511 } else {
1512 cluster = max_cluster;
1513 }
1514
1515 if (i + cluster > ra_index) {
1516 ra_index = max(i, ra_index);
1517 if (ra)
1518 page_cache_sync_readahead(inode->i_mapping, ra,
1519 file, ra_index, cluster);
1520 ra_index += cluster;
1521 }
1522
1523 inode_lock(inode);
1524 if (IS_SWAPFILE(inode)) {
1525 ret = -ETXTBSY;
1526 } else {
1527 if (do_compress)
1528 BTRFS_I(inode)->defrag_compress = compress_type;
1529 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1530 }
1531 if (ret < 0) {
1532 inode_unlock(inode);
1533 goto out_ra;
1534 }
1535
1536 defrag_count += ret;
1537 balance_dirty_pages_ratelimited(inode->i_mapping);
1538 inode_unlock(inode);
1539
1540 if (newer_than) {
1541 if (newer_off == (u64)-1)
1542 break;
1543
1544 if (ret > 0)
1545 i += ret;
1546
1547 newer_off = max(newer_off + 1,
1548 (u64)i << PAGE_SHIFT);
1549
1550 ret = find_new_extents(root, inode, newer_than,
1551 &newer_off, SZ_64K);
1552 if (!ret) {
1553 range->start = newer_off;
1554 i = (newer_off & new_align) >> PAGE_SHIFT;
1555 } else {
1556 break;
1557 }
1558 } else {
1559 if (ret > 0) {
1560 i += ret;
1561 last_len += ret << PAGE_SHIFT;
1562 } else {
1563 i++;
1564 last_len = 0;
1565 }
1566 }
1567 }
1568
1569 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) {
1570 filemap_flush(inode->i_mapping);
1571 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1572 &BTRFS_I(inode)->runtime_flags))
1573 filemap_flush(inode->i_mapping);
1574 }
1575
1576 if (range->compress_type == BTRFS_COMPRESS_LZO) {
1577 btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
1578 } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) {
1579 btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
1580 }
1581
1582 ret = defrag_count;
1583
1584 out_ra:
1585 if (do_compress) {
1586 inode_lock(inode);
1587 BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE;
1588 inode_unlock(inode);
1589 }
1590 if (!file)
1591 kfree(ra);
1592 kfree(pages);
1593 return ret;
1594 }
1595
1596 static noinline int btrfs_ioctl_resize(struct file *file,
1597 void __user *arg)
1598 {
1599 struct inode *inode = file_inode(file);
1600 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1601 u64 new_size;
1602 u64 old_size;
1603 u64 devid = 1;
1604 struct btrfs_root *root = BTRFS_I(inode)->root;
1605 struct btrfs_ioctl_vol_args *vol_args;
1606 struct btrfs_trans_handle *trans;
1607 struct btrfs_device *device = NULL;
1608 char *sizestr;
1609 char *retptr;
1610 char *devstr = NULL;
1611 int ret = 0;
1612 int mod = 0;
1613
1614 if (!capable(CAP_SYS_ADMIN))
1615 return -EPERM;
1616
1617 ret = mnt_want_write_file(file);
1618 if (ret)
1619 return ret;
1620
1621 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
1622 mnt_drop_write_file(file);
1623 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
1624 }
1625
1626 vol_args = memdup_user(arg, sizeof(*vol_args));
1627 if (IS_ERR(vol_args)) {
1628 ret = PTR_ERR(vol_args);
1629 goto out;
1630 }
1631
1632 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1633
1634 sizestr = vol_args->name;
1635 devstr = strchr(sizestr, ':');
1636 if (devstr) {
1637 sizestr = devstr + 1;
1638 *devstr = '\0';
1639 devstr = vol_args->name;
1640 ret = kstrtoull(devstr, 10, &devid);
1641 if (ret)
1642 goto out_free;
1643 if (!devid) {
1644 ret = -EINVAL;
1645 goto out_free;
1646 }
1647 btrfs_info(fs_info, "resizing devid %llu", devid);
1648 }
1649
1650 device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true);
1651 if (!device) {
1652 btrfs_info(fs_info, "resizer unable to find device %llu",
1653 devid);
1654 ret = -ENODEV;
1655 goto out_free;
1656 }
1657
1658 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) {
1659 btrfs_info(fs_info,
1660 "resizer unable to apply on readonly device %llu",
1661 devid);
1662 ret = -EPERM;
1663 goto out_free;
1664 }
1665
1666 if (!strcmp(sizestr, "max"))
1667 new_size = device->bdev->bd_inode->i_size;
1668 else {
1669 if (sizestr[0] == '-') {
1670 mod = -1;
1671 sizestr++;
1672 } else if (sizestr[0] == '+') {
1673 mod = 1;
1674 sizestr++;
1675 }
1676 new_size = memparse(sizestr, &retptr);
1677 if (*retptr != '\0' || new_size == 0) {
1678 ret = -EINVAL;
1679 goto out_free;
1680 }
1681 }
1682
1683 if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) {
1684 ret = -EPERM;
1685 goto out_free;
1686 }
1687
1688 old_size = btrfs_device_get_total_bytes(device);
1689
1690 if (mod < 0) {
1691 if (new_size > old_size) {
1692 ret = -EINVAL;
1693 goto out_free;
1694 }
1695 new_size = old_size - new_size;
1696 } else if (mod > 0) {
1697 if (new_size > ULLONG_MAX - old_size) {
1698 ret = -ERANGE;
1699 goto out_free;
1700 }
1701 new_size = old_size + new_size;
1702 }
1703
1704 if (new_size < SZ_256M) {
1705 ret = -EINVAL;
1706 goto out_free;
1707 }
1708 if (new_size > device->bdev->bd_inode->i_size) {
1709 ret = -EFBIG;
1710 goto out_free;
1711 }
1712
1713 new_size = round_down(new_size, fs_info->sectorsize);
1714
1715 btrfs_info_in_rcu(fs_info, "new size for %s is %llu",
1716 rcu_str_deref(device->name), new_size);
1717
1718 if (new_size > old_size) {
1719 trans = btrfs_start_transaction(root, 0);
1720 if (IS_ERR(trans)) {
1721 ret = PTR_ERR(trans);
1722 goto out_free;
1723 }
1724 ret = btrfs_grow_device(trans, device, new_size);
1725 btrfs_commit_transaction(trans);
1726 } else if (new_size < old_size) {
1727 ret = btrfs_shrink_device(device, new_size);
1728 }
1729
1730 out_free:
1731 kfree(vol_args);
1732 out:
1733 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
1734 mnt_drop_write_file(file);
1735 return ret;
1736 }
1737
1738 static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
1739 const char *name, unsigned long fd, int subvol,
1740 u64 *transid, bool readonly,
1741 struct btrfs_qgroup_inherit *inherit)
1742 {
1743 int namelen;
1744 int ret = 0;
1745
1746 if (!S_ISDIR(file_inode(file)->i_mode))
1747 return -ENOTDIR;
1748
1749 ret = mnt_want_write_file(file);
1750 if (ret)
1751 goto out;
1752
1753 namelen = strlen(name);
1754 if (strchr(name, '/')) {
1755 ret = -EINVAL;
1756 goto out_drop_write;
1757 }
1758
1759 if (name[0] == '.' &&
1760 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1761 ret = -EEXIST;
1762 goto out_drop_write;
1763 }
1764
1765 if (subvol) {
1766 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1767 NULL, transid, readonly, inherit);
1768 } else {
1769 struct fd src = fdget(fd);
1770 struct inode *src_inode;
1771 if (!src.file) {
1772 ret = -EINVAL;
1773 goto out_drop_write;
1774 }
1775
1776 src_inode = file_inode(src.file);
1777 if (src_inode->i_sb != file_inode(file)->i_sb) {
1778 btrfs_info(BTRFS_I(file_inode(file))->root->fs_info,
1779 "Snapshot src from another FS");
1780 ret = -EXDEV;
1781 } else if (!inode_owner_or_capable(src_inode)) {
1782
1783
1784
1785
1786 ret = -EPERM;
1787 } else {
1788 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1789 BTRFS_I(src_inode)->root,
1790 transid, readonly, inherit);
1791 }
1792 fdput(src);
1793 }
1794 out_drop_write:
1795 mnt_drop_write_file(file);
1796 out:
1797 return ret;
1798 }
1799
1800 static noinline int btrfs_ioctl_snap_create(struct file *file,
1801 void __user *arg, int subvol)
1802 {
1803 struct btrfs_ioctl_vol_args *vol_args;
1804 int ret;
1805
1806 if (!S_ISDIR(file_inode(file)->i_mode))
1807 return -ENOTDIR;
1808
1809 vol_args = memdup_user(arg, sizeof(*vol_args));
1810 if (IS_ERR(vol_args))
1811 return PTR_ERR(vol_args);
1812 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1813
1814 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1815 vol_args->fd, subvol,
1816 NULL, false, NULL);
1817
1818 kfree(vol_args);
1819 return ret;
1820 }
1821
1822 static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1823 void __user *arg, int subvol)
1824 {
1825 struct btrfs_ioctl_vol_args_v2 *vol_args;
1826 int ret;
1827 u64 transid = 0;
1828 u64 *ptr = NULL;
1829 bool readonly = false;
1830 struct btrfs_qgroup_inherit *inherit = NULL;
1831
1832 if (!S_ISDIR(file_inode(file)->i_mode))
1833 return -ENOTDIR;
1834
1835 vol_args = memdup_user(arg, sizeof(*vol_args));
1836 if (IS_ERR(vol_args))
1837 return PTR_ERR(vol_args);
1838 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
1839
1840 if (vol_args->flags &
1841 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1842 BTRFS_SUBVOL_QGROUP_INHERIT)) {
1843 ret = -EOPNOTSUPP;
1844 goto free_args;
1845 }
1846
1847 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1848 struct inode *inode = file_inode(file);
1849 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1850
1851 btrfs_warn(fs_info,
1852 "SNAP_CREATE_V2 ioctl with CREATE_ASYNC is deprecated and will be removed in kernel 5.7");
1853
1854 ptr = &transid;
1855 }
1856 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1857 readonly = true;
1858 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1859 if (vol_args->size > PAGE_SIZE) {
1860 ret = -EINVAL;
1861 goto free_args;
1862 }
1863 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1864 if (IS_ERR(inherit)) {
1865 ret = PTR_ERR(inherit);
1866 goto free_args;
1867 }
1868 }
1869
1870 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1871 vol_args->fd, subvol, ptr,
1872 readonly, inherit);
1873 if (ret)
1874 goto free_inherit;
1875
1876 if (ptr && copy_to_user(arg +
1877 offsetof(struct btrfs_ioctl_vol_args_v2,
1878 transid),
1879 ptr, sizeof(*ptr)))
1880 ret = -EFAULT;
1881
1882 free_inherit:
1883 kfree(inherit);
1884 free_args:
1885 kfree(vol_args);
1886 return ret;
1887 }
1888
1889 static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1890 void __user *arg)
1891 {
1892 struct inode *inode = file_inode(file);
1893 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1894 struct btrfs_root *root = BTRFS_I(inode)->root;
1895 int ret = 0;
1896 u64 flags = 0;
1897
1898 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID)
1899 return -EINVAL;
1900
1901 down_read(&fs_info->subvol_sem);
1902 if (btrfs_root_readonly(root))
1903 flags |= BTRFS_SUBVOL_RDONLY;
1904 up_read(&fs_info->subvol_sem);
1905
1906 if (copy_to_user(arg, &flags, sizeof(flags)))
1907 ret = -EFAULT;
1908
1909 return ret;
1910 }
1911
1912 static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1913 void __user *arg)
1914 {
1915 struct inode *inode = file_inode(file);
1916 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1917 struct btrfs_root *root = BTRFS_I(inode)->root;
1918 struct btrfs_trans_handle *trans;
1919 u64 root_flags;
1920 u64 flags;
1921 int ret = 0;
1922
1923 if (!inode_owner_or_capable(inode))
1924 return -EPERM;
1925
1926 ret = mnt_want_write_file(file);
1927 if (ret)
1928 goto out;
1929
1930 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
1931 ret = -EINVAL;
1932 goto out_drop_write;
1933 }
1934
1935 if (copy_from_user(&flags, arg, sizeof(flags))) {
1936 ret = -EFAULT;
1937 goto out_drop_write;
1938 }
1939
1940 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1941 ret = -EINVAL;
1942 goto out_drop_write;
1943 }
1944
1945 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1946 ret = -EOPNOTSUPP;
1947 goto out_drop_write;
1948 }
1949
1950 down_write(&fs_info->subvol_sem);
1951
1952
1953 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1954 goto out_drop_sem;
1955
1956 root_flags = btrfs_root_flags(&root->root_item);
1957 if (flags & BTRFS_SUBVOL_RDONLY) {
1958 btrfs_set_root_flags(&root->root_item,
1959 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1960 } else {
1961
1962
1963
1964
1965 spin_lock(&root->root_item_lock);
1966 if (root->send_in_progress == 0) {
1967 btrfs_set_root_flags(&root->root_item,
1968 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1969 spin_unlock(&root->root_item_lock);
1970 } else {
1971 spin_unlock(&root->root_item_lock);
1972 btrfs_warn(fs_info,
1973 "Attempt to set subvolume %llu read-write during send",
1974 root->root_key.objectid);
1975 ret = -EPERM;
1976 goto out_drop_sem;
1977 }
1978 }
1979
1980 trans = btrfs_start_transaction(root, 1);
1981 if (IS_ERR(trans)) {
1982 ret = PTR_ERR(trans);
1983 goto out_reset;
1984 }
1985
1986 ret = btrfs_update_root(trans, fs_info->tree_root,
1987 &root->root_key, &root->root_item);
1988 if (ret < 0) {
1989 btrfs_end_transaction(trans);
1990 goto out_reset;
1991 }
1992
1993 ret = btrfs_commit_transaction(trans);
1994
1995 out_reset:
1996 if (ret)
1997 btrfs_set_root_flags(&root->root_item, root_flags);
1998 out_drop_sem:
1999 up_write(&fs_info->subvol_sem);
2000 out_drop_write:
2001 mnt_drop_write_file(file);
2002 out:
2003 return ret;
2004 }
2005
2006 static noinline int key_in_sk(struct btrfs_key *key,
2007 struct btrfs_ioctl_search_key *sk)
2008 {
2009 struct btrfs_key test;
2010 int ret;
2011
2012 test.objectid = sk->min_objectid;
2013 test.type = sk->min_type;
2014 test.offset = sk->min_offset;
2015
2016 ret = btrfs_comp_cpu_keys(key, &test);
2017 if (ret < 0)
2018 return 0;
2019
2020 test.objectid = sk->max_objectid;
2021 test.type = sk->max_type;
2022 test.offset = sk->max_offset;
2023
2024 ret = btrfs_comp_cpu_keys(key, &test);
2025 if (ret > 0)
2026 return 0;
2027 return 1;
2028 }
2029
2030 static noinline int copy_to_sk(struct btrfs_path *path,
2031 struct btrfs_key *key,
2032 struct btrfs_ioctl_search_key *sk,
2033 size_t *buf_size,
2034 char __user *ubuf,
2035 unsigned long *sk_offset,
2036 int *num_found)
2037 {
2038 u64 found_transid;
2039 struct extent_buffer *leaf;
2040 struct btrfs_ioctl_search_header sh;
2041 struct btrfs_key test;
2042 unsigned long item_off;
2043 unsigned long item_len;
2044 int nritems;
2045 int i;
2046 int slot;
2047 int ret = 0;
2048
2049 leaf = path->nodes[0];
2050 slot = path->slots[0];
2051 nritems = btrfs_header_nritems(leaf);
2052
2053 if (btrfs_header_generation(leaf) > sk->max_transid) {
2054 i = nritems;
2055 goto advance_key;
2056 }
2057 found_transid = btrfs_header_generation(leaf);
2058
2059 for (i = slot; i < nritems; i++) {
2060 item_off = btrfs_item_ptr_offset(leaf, i);
2061 item_len = btrfs_item_size_nr(leaf, i);
2062
2063 btrfs_item_key_to_cpu(leaf, key, i);
2064 if (!key_in_sk(key, sk))
2065 continue;
2066
2067 if (sizeof(sh) + item_len > *buf_size) {
2068 if (*num_found) {
2069 ret = 1;
2070 goto out;
2071 }
2072
2073
2074
2075
2076
2077
2078 *buf_size = sizeof(sh) + item_len;
2079 item_len = 0;
2080 ret = -EOVERFLOW;
2081 }
2082
2083 if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
2084 ret = 1;
2085 goto out;
2086 }
2087
2088 sh.objectid = key->objectid;
2089 sh.offset = key->offset;
2090 sh.type = key->type;
2091 sh.len = item_len;
2092 sh.transid = found_transid;
2093
2094
2095 if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) {
2096 ret = -EFAULT;
2097 goto out;
2098 }
2099
2100 *sk_offset += sizeof(sh);
2101
2102 if (item_len) {
2103 char __user *up = ubuf + *sk_offset;
2104
2105 if (read_extent_buffer_to_user(leaf, up,
2106 item_off, item_len)) {
2107 ret = -EFAULT;
2108 goto out;
2109 }
2110
2111 *sk_offset += item_len;
2112 }
2113 (*num_found)++;
2114
2115 if (ret)
2116 goto out;
2117
2118 if (*num_found >= sk->nr_items) {
2119 ret = 1;
2120 goto out;
2121 }
2122 }
2123 advance_key:
2124 ret = 0;
2125 test.objectid = sk->max_objectid;
2126 test.type = sk->max_type;
2127 test.offset = sk->max_offset;
2128 if (btrfs_comp_cpu_keys(key, &test) >= 0)
2129 ret = 1;
2130 else if (key->offset < (u64)-1)
2131 key->offset++;
2132 else if (key->type < (u8)-1) {
2133 key->offset = 0;
2134 key->type++;
2135 } else if (key->objectid < (u64)-1) {
2136 key->offset = 0;
2137 key->type = 0;
2138 key->objectid++;
2139 } else
2140 ret = 1;
2141 out:
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151 return ret;
2152 }
2153
2154 static noinline int search_ioctl(struct inode *inode,
2155 struct btrfs_ioctl_search_key *sk,
2156 size_t *buf_size,
2157 char __user *ubuf)
2158 {
2159 struct btrfs_fs_info *info = btrfs_sb(inode->i_sb);
2160 struct btrfs_root *root;
2161 struct btrfs_key key;
2162 struct btrfs_path *path;
2163 int ret;
2164 int num_found = 0;
2165 unsigned long sk_offset = 0;
2166
2167 if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
2168 *buf_size = sizeof(struct btrfs_ioctl_search_header);
2169 return -EOVERFLOW;
2170 }
2171
2172 path = btrfs_alloc_path();
2173 if (!path)
2174 return -ENOMEM;
2175
2176 if (sk->tree_id == 0) {
2177
2178 root = BTRFS_I(inode)->root;
2179 } else {
2180 key.objectid = sk->tree_id;
2181 key.type = BTRFS_ROOT_ITEM_KEY;
2182 key.offset = (u64)-1;
2183 root = btrfs_read_fs_root_no_name(info, &key);
2184 if (IS_ERR(root)) {
2185 btrfs_free_path(path);
2186 return PTR_ERR(root);
2187 }
2188 }
2189
2190 key.objectid = sk->min_objectid;
2191 key.type = sk->min_type;
2192 key.offset = sk->min_offset;
2193
2194 while (1) {
2195 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
2196 if (ret != 0) {
2197 if (ret > 0)
2198 ret = 0;
2199 goto err;
2200 }
2201 ret = copy_to_sk(path, &key, sk, buf_size, ubuf,
2202 &sk_offset, &num_found);
2203 btrfs_release_path(path);
2204 if (ret)
2205 break;
2206
2207 }
2208 if (ret > 0)
2209 ret = 0;
2210 err:
2211 sk->nr_items = num_found;
2212 btrfs_free_path(path);
2213 return ret;
2214 }
2215
2216 static noinline int btrfs_ioctl_tree_search(struct file *file,
2217 void __user *argp)
2218 {
2219 struct btrfs_ioctl_search_args __user *uargs;
2220 struct btrfs_ioctl_search_key sk;
2221 struct inode *inode;
2222 int ret;
2223 size_t buf_size;
2224
2225 if (!capable(CAP_SYS_ADMIN))
2226 return -EPERM;
2227
2228 uargs = (struct btrfs_ioctl_search_args __user *)argp;
2229
2230 if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
2231 return -EFAULT;
2232
2233 buf_size = sizeof(uargs->buf);
2234
2235 inode = file_inode(file);
2236 ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
2237
2238
2239
2240
2241
2242 if (ret == -EOVERFLOW)
2243 ret = 0;
2244
2245 if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
2246 ret = -EFAULT;
2247 return ret;
2248 }
2249
2250 static noinline int btrfs_ioctl_tree_search_v2(struct file *file,
2251 void __user *argp)
2252 {
2253 struct btrfs_ioctl_search_args_v2 __user *uarg;
2254 struct btrfs_ioctl_search_args_v2 args;
2255 struct inode *inode;
2256 int ret;
2257 size_t buf_size;
2258 const size_t buf_limit = SZ_16M;
2259
2260 if (!capable(CAP_SYS_ADMIN))
2261 return -EPERM;
2262
2263
2264 uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp;
2265 if (copy_from_user(&args, uarg, sizeof(args)))
2266 return -EFAULT;
2267
2268 buf_size = args.buf_size;
2269
2270
2271 if (buf_size > buf_limit)
2272 buf_size = buf_limit;
2273
2274 inode = file_inode(file);
2275 ret = search_ioctl(inode, &args.key, &buf_size,
2276 (char __user *)(&uarg->buf[0]));
2277 if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
2278 ret = -EFAULT;
2279 else if (ret == -EOVERFLOW &&
2280 copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
2281 ret = -EFAULT;
2282
2283 return ret;
2284 }
2285
2286
2287
2288
2289
2290 static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
2291 u64 tree_id, u64 dirid, char *name)
2292 {
2293 struct btrfs_root *root;
2294 struct btrfs_key key;
2295 char *ptr;
2296 int ret = -1;
2297 int slot;
2298 int len;
2299 int total_len = 0;
2300 struct btrfs_inode_ref *iref;
2301 struct extent_buffer *l;
2302 struct btrfs_path *path;
2303
2304 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
2305 name[0]='\0';
2306 return 0;
2307 }
2308
2309 path = btrfs_alloc_path();
2310 if (!path)
2311 return -ENOMEM;
2312
2313 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1];
2314
2315 key.objectid = tree_id;
2316 key.type = BTRFS_ROOT_ITEM_KEY;
2317 key.offset = (u64)-1;
2318 root = btrfs_read_fs_root_no_name(info, &key);
2319 if (IS_ERR(root)) {
2320 ret = PTR_ERR(root);
2321 goto out;
2322 }
2323
2324 key.objectid = dirid;
2325 key.type = BTRFS_INODE_REF_KEY;
2326 key.offset = (u64)-1;
2327
2328 while (1) {
2329 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2330 if (ret < 0)
2331 goto out;
2332 else if (ret > 0) {
2333 ret = btrfs_previous_item(root, path, dirid,
2334 BTRFS_INODE_REF_KEY);
2335 if (ret < 0)
2336 goto out;
2337 else if (ret > 0) {
2338 ret = -ENOENT;
2339 goto out;
2340 }
2341 }
2342
2343 l = path->nodes[0];
2344 slot = path->slots[0];
2345 btrfs_item_key_to_cpu(l, &key, slot);
2346
2347 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2348 len = btrfs_inode_ref_name_len(l, iref);
2349 ptr -= len + 1;
2350 total_len += len + 1;
2351 if (ptr < name) {
2352 ret = -ENAMETOOLONG;
2353 goto out;
2354 }
2355
2356 *(ptr + len) = '/';
2357 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
2358
2359 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2360 break;
2361
2362 btrfs_release_path(path);
2363 key.objectid = key.offset;
2364 key.offset = (u64)-1;
2365 dirid = key.objectid;
2366 }
2367 memmove(name, ptr, total_len);
2368 name[total_len] = '\0';
2369 ret = 0;
2370 out:
2371 btrfs_free_path(path);
2372 return ret;
2373 }
2374
2375 static int btrfs_search_path_in_tree_user(struct inode *inode,
2376 struct btrfs_ioctl_ino_lookup_user_args *args)
2377 {
2378 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
2379 struct super_block *sb = inode->i_sb;
2380 struct btrfs_key upper_limit = BTRFS_I(inode)->location;
2381 u64 treeid = BTRFS_I(inode)->root->root_key.objectid;
2382 u64 dirid = args->dirid;
2383 unsigned long item_off;
2384 unsigned long item_len;
2385 struct btrfs_inode_ref *iref;
2386 struct btrfs_root_ref *rref;
2387 struct btrfs_root *root;
2388 struct btrfs_path *path;
2389 struct btrfs_key key, key2;
2390 struct extent_buffer *leaf;
2391 struct inode *temp_inode;
2392 char *ptr;
2393 int slot;
2394 int len;
2395 int total_len = 0;
2396 int ret;
2397
2398 path = btrfs_alloc_path();
2399 if (!path)
2400 return -ENOMEM;
2401
2402
2403
2404
2405
2406 if (dirid != upper_limit.objectid) {
2407 ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1];
2408
2409 key.objectid = treeid;
2410 key.type = BTRFS_ROOT_ITEM_KEY;
2411 key.offset = (u64)-1;
2412 root = btrfs_read_fs_root_no_name(fs_info, &key);
2413 if (IS_ERR(root)) {
2414 ret = PTR_ERR(root);
2415 goto out;
2416 }
2417
2418 key.objectid = dirid;
2419 key.type = BTRFS_INODE_REF_KEY;
2420 key.offset = (u64)-1;
2421 while (1) {
2422 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2423 if (ret < 0) {
2424 goto out;
2425 } else if (ret > 0) {
2426 ret = btrfs_previous_item(root, path, dirid,
2427 BTRFS_INODE_REF_KEY);
2428 if (ret < 0) {
2429 goto out;
2430 } else if (ret > 0) {
2431 ret = -ENOENT;
2432 goto out;
2433 }
2434 }
2435
2436 leaf = path->nodes[0];
2437 slot = path->slots[0];
2438 btrfs_item_key_to_cpu(leaf, &key, slot);
2439
2440 iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref);
2441 len = btrfs_inode_ref_name_len(leaf, iref);
2442 ptr -= len + 1;
2443 total_len += len + 1;
2444 if (ptr < args->path) {
2445 ret = -ENAMETOOLONG;
2446 goto out;
2447 }
2448
2449 *(ptr + len) = '/';
2450 read_extent_buffer(leaf, ptr,
2451 (unsigned long)(iref + 1), len);
2452
2453
2454 ret = btrfs_previous_item(root, path, dirid,
2455 BTRFS_INODE_ITEM_KEY);
2456 if (ret < 0) {
2457 goto out;
2458 } else if (ret > 0) {
2459 ret = -ENOENT;
2460 goto out;
2461 }
2462
2463 leaf = path->nodes[0];
2464 slot = path->slots[0];
2465 btrfs_item_key_to_cpu(leaf, &key2, slot);
2466 if (key2.objectid != dirid) {
2467 ret = -ENOENT;
2468 goto out;
2469 }
2470
2471 temp_inode = btrfs_iget(sb, &key2, root, NULL);
2472 if (IS_ERR(temp_inode)) {
2473 ret = PTR_ERR(temp_inode);
2474 goto out;
2475 }
2476 ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC);
2477 iput(temp_inode);
2478 if (ret) {
2479 ret = -EACCES;
2480 goto out;
2481 }
2482
2483 if (key.offset == upper_limit.objectid)
2484 break;
2485 if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) {
2486 ret = -EACCES;
2487 goto out;
2488 }
2489
2490 btrfs_release_path(path);
2491 key.objectid = key.offset;
2492 key.offset = (u64)-1;
2493 dirid = key.objectid;
2494 }
2495
2496 memmove(args->path, ptr, total_len);
2497 args->path[total_len] = '\0';
2498 btrfs_release_path(path);
2499 }
2500
2501
2502 root = fs_info->tree_root;
2503 key.objectid = treeid;
2504 key.type = BTRFS_ROOT_REF_KEY;
2505 key.offset = args->treeid;
2506 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2507 if (ret < 0) {
2508 goto out;
2509 } else if (ret > 0) {
2510 ret = -ENOENT;
2511 goto out;
2512 }
2513
2514 leaf = path->nodes[0];
2515 slot = path->slots[0];
2516 btrfs_item_key_to_cpu(leaf, &key, slot);
2517
2518 item_off = btrfs_item_ptr_offset(leaf, slot);
2519 item_len = btrfs_item_size_nr(leaf, slot);
2520
2521 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2522 if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) {
2523 ret = -EINVAL;
2524 goto out;
2525 }
2526
2527
2528 item_off += sizeof(struct btrfs_root_ref);
2529 item_len -= sizeof(struct btrfs_root_ref);
2530 read_extent_buffer(leaf, args->name, item_off, item_len);
2531 args->name[item_len] = 0;
2532
2533 out:
2534 btrfs_free_path(path);
2535 return ret;
2536 }
2537
2538 static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2539 void __user *argp)
2540 {
2541 struct btrfs_ioctl_ino_lookup_args *args;
2542 struct inode *inode;
2543 int ret = 0;
2544
2545 args = memdup_user(argp, sizeof(*args));
2546 if (IS_ERR(args))
2547 return PTR_ERR(args);
2548
2549 inode = file_inode(file);
2550
2551
2552
2553
2554
2555 if (args->treeid == 0)
2556 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2557
2558 if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) {
2559 args->name[0] = 0;
2560 goto out;
2561 }
2562
2563 if (!capable(CAP_SYS_ADMIN)) {
2564 ret = -EPERM;
2565 goto out;
2566 }
2567
2568 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2569 args->treeid, args->objectid,
2570 args->name);
2571
2572 out:
2573 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2574 ret = -EFAULT;
2575
2576 kfree(args);
2577 return ret;
2578 }
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592 static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp)
2593 {
2594 struct btrfs_ioctl_ino_lookup_user_args *args;
2595 struct inode *inode;
2596 int ret;
2597
2598 args = memdup_user(argp, sizeof(*args));
2599 if (IS_ERR(args))
2600 return PTR_ERR(args);
2601
2602 inode = file_inode(file);
2603
2604 if (args->dirid == BTRFS_FIRST_FREE_OBJECTID &&
2605 BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) {
2606
2607
2608
2609
2610 kfree(args);
2611 return -EACCES;
2612 }
2613
2614 ret = btrfs_search_path_in_tree_user(inode, args);
2615
2616 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2617 ret = -EFAULT;
2618
2619 kfree(args);
2620 return ret;
2621 }
2622
2623
2624 static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp)
2625 {
2626 struct btrfs_ioctl_get_subvol_info_args *subvol_info;
2627 struct btrfs_fs_info *fs_info;
2628 struct btrfs_root *root;
2629 struct btrfs_path *path;
2630 struct btrfs_key key;
2631 struct btrfs_root_item *root_item;
2632 struct btrfs_root_ref *rref;
2633 struct extent_buffer *leaf;
2634 unsigned long item_off;
2635 unsigned long item_len;
2636 struct inode *inode;
2637 int slot;
2638 int ret = 0;
2639
2640 path = btrfs_alloc_path();
2641 if (!path)
2642 return -ENOMEM;
2643
2644 subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL);
2645 if (!subvol_info) {
2646 btrfs_free_path(path);
2647 return -ENOMEM;
2648 }
2649
2650 inode = file_inode(file);
2651 fs_info = BTRFS_I(inode)->root->fs_info;
2652
2653
2654 key.objectid = BTRFS_I(inode)->root->root_key.objectid;
2655 key.type = BTRFS_ROOT_ITEM_KEY;
2656 key.offset = (u64)-1;
2657 root = btrfs_read_fs_root_no_name(fs_info, &key);
2658 if (IS_ERR(root)) {
2659 ret = PTR_ERR(root);
2660 goto out;
2661 }
2662 root_item = &root->root_item;
2663
2664 subvol_info->treeid = key.objectid;
2665
2666 subvol_info->generation = btrfs_root_generation(root_item);
2667 subvol_info->flags = btrfs_root_flags(root_item);
2668
2669 memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE);
2670 memcpy(subvol_info->parent_uuid, root_item->parent_uuid,
2671 BTRFS_UUID_SIZE);
2672 memcpy(subvol_info->received_uuid, root_item->received_uuid,
2673 BTRFS_UUID_SIZE);
2674
2675 subvol_info->ctransid = btrfs_root_ctransid(root_item);
2676 subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime);
2677 subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime);
2678
2679 subvol_info->otransid = btrfs_root_otransid(root_item);
2680 subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime);
2681 subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime);
2682
2683 subvol_info->stransid = btrfs_root_stransid(root_item);
2684 subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime);
2685 subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime);
2686
2687 subvol_info->rtransid = btrfs_root_rtransid(root_item);
2688 subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime);
2689 subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime);
2690
2691 if (key.objectid != BTRFS_FS_TREE_OBJECTID) {
2692
2693 root = fs_info->tree_root;
2694
2695 key.type = BTRFS_ROOT_BACKREF_KEY;
2696 key.offset = 0;
2697 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2698 if (ret < 0) {
2699 goto out;
2700 } else if (path->slots[0] >=
2701 btrfs_header_nritems(path->nodes[0])) {
2702 ret = btrfs_next_leaf(root, path);
2703 if (ret < 0) {
2704 goto out;
2705 } else if (ret > 0) {
2706 ret = -EUCLEAN;
2707 goto out;
2708 }
2709 }
2710
2711 leaf = path->nodes[0];
2712 slot = path->slots[0];
2713 btrfs_item_key_to_cpu(leaf, &key, slot);
2714 if (key.objectid == subvol_info->treeid &&
2715 key.type == BTRFS_ROOT_BACKREF_KEY) {
2716 subvol_info->parent_id = key.offset;
2717
2718 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2719 subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref);
2720
2721 item_off = btrfs_item_ptr_offset(leaf, slot)
2722 + sizeof(struct btrfs_root_ref);
2723 item_len = btrfs_item_size_nr(leaf, slot)
2724 - sizeof(struct btrfs_root_ref);
2725 read_extent_buffer(leaf, subvol_info->name,
2726 item_off, item_len);
2727 } else {
2728 ret = -ENOENT;
2729 goto out;
2730 }
2731 }
2732
2733 if (copy_to_user(argp, subvol_info, sizeof(*subvol_info)))
2734 ret = -EFAULT;
2735
2736 out:
2737 btrfs_free_path(path);
2738 kzfree(subvol_info);
2739 return ret;
2740 }
2741
2742
2743
2744
2745
2746 static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp)
2747 {
2748 struct btrfs_ioctl_get_subvol_rootref_args *rootrefs;
2749 struct btrfs_root_ref *rref;
2750 struct btrfs_root *root;
2751 struct btrfs_path *path;
2752 struct btrfs_key key;
2753 struct extent_buffer *leaf;
2754 struct inode *inode;
2755 u64 objectid;
2756 int slot;
2757 int ret;
2758 u8 found;
2759
2760 path = btrfs_alloc_path();
2761 if (!path)
2762 return -ENOMEM;
2763
2764 rootrefs = memdup_user(argp, sizeof(*rootrefs));
2765 if (IS_ERR(rootrefs)) {
2766 btrfs_free_path(path);
2767 return PTR_ERR(rootrefs);
2768 }
2769
2770 inode = file_inode(file);
2771 root = BTRFS_I(inode)->root->fs_info->tree_root;
2772 objectid = BTRFS_I(inode)->root->root_key.objectid;
2773
2774 key.objectid = objectid;
2775 key.type = BTRFS_ROOT_REF_KEY;
2776 key.offset = rootrefs->min_treeid;
2777 found = 0;
2778
2779 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2780 if (ret < 0) {
2781 goto out;
2782 } else if (path->slots[0] >=
2783 btrfs_header_nritems(path->nodes[0])) {
2784 ret = btrfs_next_leaf(root, path);
2785 if (ret < 0) {
2786 goto out;
2787 } else if (ret > 0) {
2788 ret = -EUCLEAN;
2789 goto out;
2790 }
2791 }
2792 while (1) {
2793 leaf = path->nodes[0];
2794 slot = path->slots[0];
2795
2796 btrfs_item_key_to_cpu(leaf, &key, slot);
2797 if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) {
2798 ret = 0;
2799 goto out;
2800 }
2801
2802 if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) {
2803 ret = -EOVERFLOW;
2804 goto out;
2805 }
2806
2807 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2808 rootrefs->rootref[found].treeid = key.offset;
2809 rootrefs->rootref[found].dirid =
2810 btrfs_root_ref_dirid(leaf, rref);
2811 found++;
2812
2813 ret = btrfs_next_item(root, path);
2814 if (ret < 0) {
2815 goto out;
2816 } else if (ret > 0) {
2817 ret = -EUCLEAN;
2818 goto out;
2819 }
2820 }
2821
2822 out:
2823 if (!ret || ret == -EOVERFLOW) {
2824 rootrefs->num_items = found;
2825
2826 if (found)
2827 rootrefs->min_treeid =
2828 rootrefs->rootref[found - 1].treeid + 1;
2829 if (copy_to_user(argp, rootrefs, sizeof(*rootrefs)))
2830 ret = -EFAULT;
2831 }
2832
2833 kfree(rootrefs);
2834 btrfs_free_path(path);
2835
2836 return ret;
2837 }
2838
2839 static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2840 void __user *arg)
2841 {
2842 struct dentry *parent = file->f_path.dentry;
2843 struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb);
2844 struct dentry *dentry;
2845 struct inode *dir = d_inode(parent);
2846 struct inode *inode;
2847 struct btrfs_root *root = BTRFS_I(dir)->root;
2848 struct btrfs_root *dest = NULL;
2849 struct btrfs_ioctl_vol_args *vol_args;
2850 int namelen;
2851 int err = 0;
2852
2853 if (!S_ISDIR(dir->i_mode))
2854 return -ENOTDIR;
2855
2856 vol_args = memdup_user(arg, sizeof(*vol_args));
2857 if (IS_ERR(vol_args))
2858 return PTR_ERR(vol_args);
2859
2860 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2861 namelen = strlen(vol_args->name);
2862 if (strchr(vol_args->name, '/') ||
2863 strncmp(vol_args->name, "..", namelen) == 0) {
2864 err = -EINVAL;
2865 goto out;
2866 }
2867
2868 err = mnt_want_write_file(file);
2869 if (err)
2870 goto out;
2871
2872
2873 err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
2874 if (err == -EINTR)
2875 goto out_drop_write;
2876 dentry = lookup_one_len(vol_args->name, parent, namelen);
2877 if (IS_ERR(dentry)) {
2878 err = PTR_ERR(dentry);
2879 goto out_unlock_dir;
2880 }
2881
2882 if (d_really_is_negative(dentry)) {
2883 err = -ENOENT;
2884 goto out_dput;
2885 }
2886
2887 inode = d_inode(dentry);
2888 dest = BTRFS_I(inode)->root;
2889 if (!capable(CAP_SYS_ADMIN)) {
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903 err = -EPERM;
2904 if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED))
2905 goto out_dput;
2906
2907
2908
2909
2910
2911
2912
2913
2914 err = -EINVAL;
2915 if (root == dest)
2916 goto out_dput;
2917
2918 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2919 if (err)
2920 goto out_dput;
2921 }
2922
2923
2924 err = btrfs_may_delete(dir, dentry, 1);
2925 if (err)
2926 goto out_dput;
2927
2928 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
2929 err = -EINVAL;
2930 goto out_dput;
2931 }
2932
2933 inode_lock(inode);
2934 err = btrfs_delete_subvolume(dir, dentry);
2935 inode_unlock(inode);
2936 if (!err) {
2937 fsnotify_rmdir(dir, dentry);
2938 d_delete(dentry);
2939 }
2940
2941 out_dput:
2942 dput(dentry);
2943 out_unlock_dir:
2944 inode_unlock(dir);
2945 out_drop_write:
2946 mnt_drop_write_file(file);
2947 out:
2948 kfree(vol_args);
2949 return err;
2950 }
2951
2952 static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
2953 {
2954 struct inode *inode = file_inode(file);
2955 struct btrfs_root *root = BTRFS_I(inode)->root;
2956 struct btrfs_ioctl_defrag_range_args *range;
2957 int ret;
2958
2959 ret = mnt_want_write_file(file);
2960 if (ret)
2961 return ret;
2962
2963 if (btrfs_root_readonly(root)) {
2964 ret = -EROFS;
2965 goto out;
2966 }
2967
2968 switch (inode->i_mode & S_IFMT) {
2969 case S_IFDIR:
2970 if (!capable(CAP_SYS_ADMIN)) {
2971 ret = -EPERM;
2972 goto out;
2973 }
2974 ret = btrfs_defrag_root(root);
2975 break;
2976 case S_IFREG:
2977
2978
2979
2980
2981
2982 if (!capable(CAP_SYS_ADMIN) &&
2983 inode_permission(inode, MAY_WRITE)) {
2984 ret = -EPERM;
2985 goto out;
2986 }
2987
2988 range = kzalloc(sizeof(*range), GFP_KERNEL);
2989 if (!range) {
2990 ret = -ENOMEM;
2991 goto out;
2992 }
2993
2994 if (argp) {
2995 if (copy_from_user(range, argp,
2996 sizeof(*range))) {
2997 ret = -EFAULT;
2998 kfree(range);
2999 goto out;
3000 }
3001
3002 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
3003 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
3004 range->extent_thresh = (u32)-1;
3005 }
3006 } else {
3007
3008 range->len = (u64)-1;
3009 }
3010 ret = btrfs_defrag_file(file_inode(file), file,
3011 range, BTRFS_OLDEST_GENERATION, 0);
3012 if (ret > 0)
3013 ret = 0;
3014 kfree(range);
3015 break;
3016 default:
3017 ret = -EINVAL;
3018 }
3019 out:
3020 mnt_drop_write_file(file);
3021 return ret;
3022 }
3023
3024 static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg)
3025 {
3026 struct btrfs_ioctl_vol_args *vol_args;
3027 int ret;
3028
3029 if (!capable(CAP_SYS_ADMIN))
3030 return -EPERM;
3031
3032 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags))
3033 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3034
3035 vol_args = memdup_user(arg, sizeof(*vol_args));
3036 if (IS_ERR(vol_args)) {
3037 ret = PTR_ERR(vol_args);
3038 goto out;
3039 }
3040
3041 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
3042 ret = btrfs_init_new_device(fs_info, vol_args->name);
3043
3044 if (!ret)
3045 btrfs_info(fs_info, "disk added %s", vol_args->name);
3046
3047 kfree(vol_args);
3048 out:
3049 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
3050 return ret;
3051 }
3052
3053 static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg)
3054 {
3055 struct inode *inode = file_inode(file);
3056 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3057 struct btrfs_ioctl_vol_args_v2 *vol_args;
3058 int ret;
3059
3060 if (!capable(CAP_SYS_ADMIN))
3061 return -EPERM;
3062
3063 ret = mnt_want_write_file(file);
3064 if (ret)
3065 return ret;
3066
3067 vol_args = memdup_user(arg, sizeof(*vol_args));
3068 if (IS_ERR(vol_args)) {
3069 ret = PTR_ERR(vol_args);
3070 goto err_drop;
3071 }
3072
3073
3074 if (vol_args->flags & ~BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED) {
3075 ret = -EOPNOTSUPP;
3076 goto out;
3077 }
3078
3079 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
3080 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3081 goto out;
3082 }
3083
3084 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) {
3085 ret = btrfs_rm_device(fs_info, NULL, vol_args->devid);
3086 } else {
3087 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
3088 ret = btrfs_rm_device(fs_info, vol_args->name, 0);
3089 }
3090 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
3091
3092 if (!ret) {
3093 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID)
3094 btrfs_info(fs_info, "device deleted: id %llu",
3095 vol_args->devid);
3096 else
3097 btrfs_info(fs_info, "device deleted: %s",
3098 vol_args->name);
3099 }
3100 out:
3101 kfree(vol_args);
3102 err_drop:
3103 mnt_drop_write_file(file);
3104 return ret;
3105 }
3106
3107 static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
3108 {
3109 struct inode *inode = file_inode(file);
3110 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3111 struct btrfs_ioctl_vol_args *vol_args;
3112 int ret;
3113
3114 if (!capable(CAP_SYS_ADMIN))
3115 return -EPERM;
3116
3117 ret = mnt_want_write_file(file);
3118 if (ret)
3119 return ret;
3120
3121 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
3122 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3123 goto out_drop_write;
3124 }
3125
3126 vol_args = memdup_user(arg, sizeof(*vol_args));
3127 if (IS_ERR(vol_args)) {
3128 ret = PTR_ERR(vol_args);
3129 goto out;
3130 }
3131
3132 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
3133 ret = btrfs_rm_device(fs_info, vol_args->name, 0);
3134
3135 if (!ret)
3136 btrfs_info(fs_info, "disk deleted %s", vol_args->name);
3137 kfree(vol_args);
3138 out:
3139 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
3140 out_drop_write:
3141 mnt_drop_write_file(file);
3142
3143 return ret;
3144 }
3145
3146 static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info,
3147 void __user *arg)
3148 {
3149 struct btrfs_ioctl_fs_info_args *fi_args;
3150 struct btrfs_device *device;
3151 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
3152 int ret = 0;
3153
3154 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
3155 if (!fi_args)
3156 return -ENOMEM;
3157
3158 rcu_read_lock();
3159 fi_args->num_devices = fs_devices->num_devices;
3160
3161 list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
3162 if (device->devid > fi_args->max_id)
3163 fi_args->max_id = device->devid;
3164 }
3165 rcu_read_unlock();
3166
3167 memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid));
3168 fi_args->nodesize = fs_info->nodesize;
3169 fi_args->sectorsize = fs_info->sectorsize;
3170 fi_args->clone_alignment = fs_info->sectorsize;
3171
3172 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
3173 ret = -EFAULT;
3174
3175 kfree(fi_args);
3176 return ret;
3177 }
3178
3179 static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info,
3180 void __user *arg)
3181 {
3182 struct btrfs_ioctl_dev_info_args *di_args;
3183 struct btrfs_device *dev;
3184 int ret = 0;
3185 char *s_uuid = NULL;
3186
3187 di_args = memdup_user(arg, sizeof(*di_args));
3188 if (IS_ERR(di_args))
3189 return PTR_ERR(di_args);
3190
3191 if (!btrfs_is_empty_uuid(di_args->uuid))
3192 s_uuid = di_args->uuid;
3193
3194 rcu_read_lock();
3195 dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid,
3196 NULL, true);
3197
3198 if (!dev) {
3199 ret = -ENODEV;
3200 goto out;
3201 }
3202
3203 di_args->devid = dev->devid;
3204 di_args->bytes_used = btrfs_device_get_bytes_used(dev);
3205 di_args->total_bytes = btrfs_device_get_total_bytes(dev);
3206 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
3207 if (dev->name) {
3208 strncpy(di_args->path, rcu_str_deref(dev->name),
3209 sizeof(di_args->path) - 1);
3210 di_args->path[sizeof(di_args->path) - 1] = 0;
3211 } else {
3212 di_args->path[0] = '\0';
3213 }
3214
3215 out:
3216 rcu_read_unlock();
3217 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
3218 ret = -EFAULT;
3219
3220 kfree(di_args);
3221 return ret;
3222 }
3223
3224 static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1,
3225 struct inode *inode2, u64 loff2, u64 len)
3226 {
3227 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
3228 unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
3229 }
3230
3231 static void btrfs_double_extent_lock(struct inode *inode1, u64 loff1,
3232 struct inode *inode2, u64 loff2, u64 len)
3233 {
3234 if (inode1 < inode2) {
3235 swap(inode1, inode2);
3236 swap(loff1, loff2);
3237 } else if (inode1 == inode2 && loff2 < loff1) {
3238 swap(loff1, loff2);
3239 }
3240 lock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
3241 lock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
3242 }
3243
3244 static int btrfs_extent_same_range(struct inode *src, u64 loff, u64 len,
3245 struct inode *dst, u64 dst_loff)
3246 {
3247 const u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
3248 int ret;
3249
3250
3251
3252
3253
3254 btrfs_double_extent_lock(src, loff, dst, dst_loff, len);
3255 ret = btrfs_clone(src, dst, loff, len, ALIGN(len, bs), dst_loff, 1);
3256 btrfs_double_extent_unlock(src, loff, dst, dst_loff, len);
3257
3258 return ret;
3259 }
3260
3261 #define BTRFS_MAX_DEDUPE_LEN SZ_16M
3262
3263 static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
3264 struct inode *dst, u64 dst_loff)
3265 {
3266 int ret;
3267 u64 i, tail_len, chunk_count;
3268 struct btrfs_root *root_dst = BTRFS_I(dst)->root;
3269
3270 spin_lock(&root_dst->root_item_lock);
3271 if (root_dst->send_in_progress) {
3272 btrfs_warn_rl(root_dst->fs_info,
3273 "cannot deduplicate to root %llu while send operations are using it (%d in progress)",
3274 root_dst->root_key.objectid,
3275 root_dst->send_in_progress);
3276 spin_unlock(&root_dst->root_item_lock);
3277 return -EAGAIN;
3278 }
3279 root_dst->dedupe_in_progress++;
3280 spin_unlock(&root_dst->root_item_lock);
3281
3282 tail_len = olen % BTRFS_MAX_DEDUPE_LEN;
3283 chunk_count = div_u64(olen, BTRFS_MAX_DEDUPE_LEN);
3284
3285 for (i = 0; i < chunk_count; i++) {
3286 ret = btrfs_extent_same_range(src, loff, BTRFS_MAX_DEDUPE_LEN,
3287 dst, dst_loff);
3288 if (ret)
3289 goto out;
3290
3291 loff += BTRFS_MAX_DEDUPE_LEN;
3292 dst_loff += BTRFS_MAX_DEDUPE_LEN;
3293 }
3294
3295 if (tail_len > 0)
3296 ret = btrfs_extent_same_range(src, loff, tail_len, dst,
3297 dst_loff);
3298 out:
3299 spin_lock(&root_dst->root_item_lock);
3300 root_dst->dedupe_in_progress--;
3301 spin_unlock(&root_dst->root_item_lock);
3302
3303 return ret;
3304 }
3305
3306 static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
3307 struct inode *inode,
3308 u64 endoff,
3309 const u64 destoff,
3310 const u64 olen,
3311 int no_time_update)
3312 {
3313 struct btrfs_root *root = BTRFS_I(inode)->root;
3314 int ret;
3315
3316 inode_inc_iversion(inode);
3317 if (!no_time_update)
3318 inode->i_mtime = inode->i_ctime = current_time(inode);
3319
3320
3321
3322
3323 if (endoff > destoff + olen)
3324 endoff = destoff + olen;
3325 if (endoff > inode->i_size)
3326 btrfs_i_size_write(BTRFS_I(inode), endoff);
3327
3328 ret = btrfs_update_inode(trans, root, inode);
3329 if (ret) {
3330 btrfs_abort_transaction(trans, ret);
3331 btrfs_end_transaction(trans);
3332 goto out;
3333 }
3334 ret = btrfs_end_transaction(trans);
3335 out:
3336 return ret;
3337 }
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364 static int clone_copy_inline_extent(struct inode *dst,
3365 struct btrfs_trans_handle *trans,
3366 struct btrfs_path *path,
3367 struct btrfs_key *new_key,
3368 const u64 drop_start,
3369 const u64 datal,
3370 const u64 skip,
3371 const u64 size,
3372 char *inline_data)
3373 {
3374 struct btrfs_fs_info *fs_info = btrfs_sb(dst->i_sb);
3375 struct btrfs_root *root = BTRFS_I(dst)->root;
3376 const u64 aligned_end = ALIGN(new_key->offset + datal,
3377 fs_info->sectorsize);
3378 int ret;
3379 struct btrfs_key key;
3380
3381 if (new_key->offset > 0)
3382 return -EOPNOTSUPP;
3383
3384 key.objectid = btrfs_ino(BTRFS_I(dst));
3385 key.type = BTRFS_EXTENT_DATA_KEY;
3386 key.offset = 0;
3387 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3388 if (ret < 0) {
3389 return ret;
3390 } else if (ret > 0) {
3391 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
3392 ret = btrfs_next_leaf(root, path);
3393 if (ret < 0)
3394 return ret;
3395 else if (ret > 0)
3396 goto copy_inline_extent;
3397 }
3398 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
3399 if (key.objectid == btrfs_ino(BTRFS_I(dst)) &&
3400 key.type == BTRFS_EXTENT_DATA_KEY) {
3401 ASSERT(key.offset > 0);
3402 return -EOPNOTSUPP;
3403 }
3404 } else if (i_size_read(dst) <= datal) {
3405 struct btrfs_file_extent_item *ei;
3406 u64 ext_len;
3407
3408
3409
3410
3411
3412
3413 ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
3414 struct btrfs_file_extent_item);
3415
3416
3417
3418
3419 if (btrfs_file_extent_type(path->nodes[0], ei) ==
3420 BTRFS_FILE_EXTENT_INLINE)
3421 goto copy_inline_extent;
3422
3423 ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei);
3424 if (ext_len > aligned_end)
3425 return -EOPNOTSUPP;
3426
3427 ret = btrfs_next_item(root, path);
3428 if (ret < 0) {
3429 return ret;
3430 } else if (ret == 0) {
3431 btrfs_item_key_to_cpu(path->nodes[0], &key,
3432 path->slots[0]);
3433 if (key.objectid == btrfs_ino(BTRFS_I(dst)) &&
3434 key.type == BTRFS_EXTENT_DATA_KEY)
3435 return -EOPNOTSUPP;
3436 }
3437 }
3438
3439 copy_inline_extent:
3440
3441
3442
3443
3444 if (i_size_read(dst) > datal) {
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457 return -EOPNOTSUPP;
3458 }
3459
3460 btrfs_release_path(path);
3461 ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1);
3462 if (ret)
3463 return ret;
3464 ret = btrfs_insert_empty_item(trans, root, path, new_key, size);
3465 if (ret)
3466 return ret;
3467
3468 if (skip) {
3469 const u32 start = btrfs_file_extent_calc_inline_size(0);
3470
3471 memmove(inline_data + start, inline_data + start + skip, datal);
3472 }
3473
3474 write_extent_buffer(path->nodes[0], inline_data,
3475 btrfs_item_ptr_offset(path->nodes[0],
3476 path->slots[0]),
3477 size);
3478 inode_add_bytes(dst, datal);
3479 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(dst)->runtime_flags);
3480
3481 return 0;
3482 }
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495 static int btrfs_clone(struct inode *src, struct inode *inode,
3496 const u64 off, const u64 olen, const u64 olen_aligned,
3497 const u64 destoff, int no_time_update)
3498 {
3499 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3500 struct btrfs_root *root = BTRFS_I(inode)->root;
3501 struct btrfs_path *path = NULL;
3502 struct extent_buffer *leaf;
3503 struct btrfs_trans_handle *trans;
3504 char *buf = NULL;
3505 struct btrfs_key key;
3506 u32 nritems;
3507 int slot;
3508 int ret;
3509 const u64 len = olen_aligned;
3510 u64 last_dest_end = destoff;
3511
3512 ret = -ENOMEM;
3513 buf = kvmalloc(fs_info->nodesize, GFP_KERNEL);
3514 if (!buf)
3515 return ret;
3516
3517 path = btrfs_alloc_path();
3518 if (!path) {
3519 kvfree(buf);
3520 return ret;
3521 }
3522
3523 path->reada = READA_FORWARD;
3524
3525 key.objectid = btrfs_ino(BTRFS_I(src));
3526 key.type = BTRFS_EXTENT_DATA_KEY;
3527 key.offset = off;
3528
3529 while (1) {
3530 u64 next_key_min_offset = key.offset + 1;
3531 struct btrfs_file_extent_item *extent;
3532 int type;
3533 u32 size;
3534 struct btrfs_key new_key;
3535 u64 disko = 0, diskl = 0;
3536 u64 datao = 0, datal = 0;
3537 u8 comp;
3538 u64 drop_start;
3539
3540
3541
3542
3543
3544 path->leave_spinning = 1;
3545 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
3546 0, 0);
3547 if (ret < 0)
3548 goto out;
3549
3550
3551
3552
3553
3554 if (key.offset == off && ret > 0 && path->slots[0] > 0) {
3555 btrfs_item_key_to_cpu(path->nodes[0], &key,
3556 path->slots[0] - 1);
3557 if (key.type == BTRFS_EXTENT_DATA_KEY)
3558 path->slots[0]--;
3559 }
3560
3561 nritems = btrfs_header_nritems(path->nodes[0]);
3562 process_slot:
3563 if (path->slots[0] >= nritems) {
3564 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
3565 if (ret < 0)
3566 goto out;
3567 if (ret > 0)
3568 break;
3569 nritems = btrfs_header_nritems(path->nodes[0]);
3570 }
3571 leaf = path->nodes[0];
3572 slot = path->slots[0];
3573
3574 btrfs_item_key_to_cpu(leaf, &key, slot);
3575 if (key.type > BTRFS_EXTENT_DATA_KEY ||
3576 key.objectid != btrfs_ino(BTRFS_I(src)))
3577 break;
3578
3579 ASSERT(key.type == BTRFS_EXTENT_DATA_KEY);
3580
3581 extent = btrfs_item_ptr(leaf, slot,
3582 struct btrfs_file_extent_item);
3583 comp = btrfs_file_extent_compression(leaf, extent);
3584 type = btrfs_file_extent_type(leaf, extent);
3585 if (type == BTRFS_FILE_EXTENT_REG ||
3586 type == BTRFS_FILE_EXTENT_PREALLOC) {
3587 disko = btrfs_file_extent_disk_bytenr(leaf, extent);
3588 diskl = btrfs_file_extent_disk_num_bytes(leaf, extent);
3589 datao = btrfs_file_extent_offset(leaf, extent);
3590 datal = btrfs_file_extent_num_bytes(leaf, extent);
3591 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3592
3593 datal = btrfs_file_extent_ram_bytes(leaf, extent);
3594 }
3595
3596
3597
3598
3599
3600
3601 if (key.offset + datal <= off) {
3602 path->slots[0]++;
3603 goto process_slot;
3604 } else if (key.offset >= off + len) {
3605 break;
3606 }
3607 next_key_min_offset = key.offset + datal;
3608 size = btrfs_item_size_nr(leaf, slot);
3609 read_extent_buffer(leaf, buf, btrfs_item_ptr_offset(leaf, slot),
3610 size);
3611
3612 btrfs_release_path(path);
3613 path->leave_spinning = 0;
3614
3615 memcpy(&new_key, &key, sizeof(new_key));
3616 new_key.objectid = btrfs_ino(BTRFS_I(inode));
3617 if (off <= key.offset)
3618 new_key.offset = key.offset + destoff - off;
3619 else
3620 new_key.offset = destoff;
3621
3622
3623
3624
3625
3626
3627
3628 if (new_key.offset != last_dest_end)
3629 drop_start = last_dest_end;
3630 else
3631 drop_start = new_key.offset;
3632
3633 if (type == BTRFS_FILE_EXTENT_REG ||
3634 type == BTRFS_FILE_EXTENT_PREALLOC) {
3635 struct btrfs_clone_extent_info clone_info;
3636
3637
3638
3639
3640
3641
3642
3643 if (key.offset + datal > off + len)
3644 datal = off + len - key.offset;
3645
3646
3647 if (off > key.offset) {
3648 datao += off - key.offset;
3649 datal -= off - key.offset;
3650 }
3651
3652 clone_info.disk_offset = disko;
3653 clone_info.disk_len = diskl;
3654 clone_info.data_offset = datao;
3655 clone_info.data_len = datal;
3656 clone_info.file_offset = new_key.offset;
3657 clone_info.extent_buf = buf;
3658 clone_info.item_size = size;
3659 ret = btrfs_punch_hole_range(inode, path,
3660 drop_start,
3661 new_key.offset + datal - 1,
3662 &clone_info, &trans);
3663 if (ret)
3664 goto out;
3665 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3666 u64 skip = 0;
3667 u64 trim = 0;
3668
3669 if (off > key.offset) {
3670 skip = off - key.offset;
3671 new_key.offset += skip;
3672 }
3673
3674 if (key.offset + datal > off + len)
3675 trim = key.offset + datal - (off + len);
3676
3677 if (comp && (skip || trim)) {
3678 ret = -EINVAL;
3679 goto out;
3680 }
3681 size -= skip + trim;
3682 datal -= skip + trim;
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692 trans = btrfs_start_transaction(root, 3);
3693 if (IS_ERR(trans)) {
3694 ret = PTR_ERR(trans);
3695 goto out;
3696 }
3697
3698 ret = clone_copy_inline_extent(inode, trans, path,
3699 &new_key, drop_start,
3700 datal, skip, size, buf);
3701 if (ret) {
3702 if (ret != -EOPNOTSUPP)
3703 btrfs_abort_transaction(trans, ret);
3704 btrfs_end_transaction(trans);
3705 goto out;
3706 }
3707 }
3708
3709 btrfs_release_path(path);
3710
3711 last_dest_end = ALIGN(new_key.offset + datal,
3712 fs_info->sectorsize);
3713 ret = clone_finish_inode_update(trans, inode, last_dest_end,
3714 destoff, olen, no_time_update);
3715 if (ret)
3716 goto out;
3717 if (new_key.offset + datal >= destoff + len)
3718 break;
3719
3720 btrfs_release_path(path);
3721 key.offset = next_key_min_offset;
3722
3723 if (fatal_signal_pending(current)) {
3724 ret = -EINTR;
3725 goto out;
3726 }
3727 }
3728 ret = 0;
3729
3730 if (last_dest_end < destoff + len) {
3731
3732
3733
3734
3735
3736
3737 btrfs_release_path(path);
3738 path->leave_spinning = 0;
3739
3740 ret = btrfs_punch_hole_range(inode, path,
3741 last_dest_end, destoff + len - 1,
3742 NULL, &trans);
3743 if (ret)
3744 goto out;
3745
3746 ret = clone_finish_inode_update(trans, inode, destoff + len,
3747 destoff, olen, no_time_update);
3748 }
3749
3750 out:
3751 btrfs_free_path(path);
3752 kvfree(buf);
3753 return ret;
3754 }
3755
3756 static noinline int btrfs_clone_files(struct file *file, struct file *file_src,
3757 u64 off, u64 olen, u64 destoff)
3758 {
3759 struct inode *inode = file_inode(file);
3760 struct inode *src = file_inode(file_src);
3761 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3762 int ret;
3763 u64 len = olen;
3764 u64 bs = fs_info->sb->s_blocksize;
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783 if (off + len == src->i_size)
3784 len = ALIGN(src->i_size, bs) - off;
3785
3786 if (destoff > inode->i_size) {
3787 const u64 wb_start = ALIGN_DOWN(inode->i_size, bs);
3788
3789 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
3790 if (ret)
3791 return ret;
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801 ret = btrfs_wait_ordered_range(inode, wb_start,
3802 destoff - wb_start);
3803 if (ret)
3804 return ret;
3805 }
3806
3807
3808
3809
3810
3811 btrfs_double_extent_lock(src, off, inode, destoff, len);
3812 ret = btrfs_clone(src, inode, off, olen, len, destoff, 0);
3813 btrfs_double_extent_unlock(src, off, inode, destoff, len);
3814
3815
3816
3817
3818 truncate_inode_pages_range(&inode->i_data,
3819 round_down(destoff, PAGE_SIZE),
3820 round_up(destoff + len, PAGE_SIZE) - 1);
3821
3822 return ret;
3823 }
3824
3825 static int btrfs_remap_file_range_prep(struct file *file_in, loff_t pos_in,
3826 struct file *file_out, loff_t pos_out,
3827 loff_t *len, unsigned int remap_flags)
3828 {
3829 struct inode *inode_in = file_inode(file_in);
3830 struct inode *inode_out = file_inode(file_out);
3831 u64 bs = BTRFS_I(inode_out)->root->fs_info->sb->s_blocksize;
3832 bool same_inode = inode_out == inode_in;
3833 u64 wb_len;
3834 int ret;
3835
3836 if (!(remap_flags & REMAP_FILE_DEDUP)) {
3837 struct btrfs_root *root_out = BTRFS_I(inode_out)->root;
3838
3839 if (btrfs_root_readonly(root_out))
3840 return -EROFS;
3841
3842 if (file_in->f_path.mnt != file_out->f_path.mnt ||
3843 inode_in->i_sb != inode_out->i_sb)
3844 return -EXDEV;
3845 }
3846
3847
3848 if ((BTRFS_I(inode_in)->flags & BTRFS_INODE_NODATASUM) !=
3849 (BTRFS_I(inode_out)->flags & BTRFS_INODE_NODATASUM)) {
3850 return -EINVAL;
3851 }
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867 if (*len == 0 && !(remap_flags & REMAP_FILE_DEDUP))
3868 wb_len = ALIGN(inode_in->i_size, bs) - ALIGN_DOWN(pos_in, bs);
3869 else
3870 wb_len = ALIGN(*len, bs);
3871
3872
3873
3874
3875
3876
3877 inode_dio_wait(inode_in);
3878 if (!same_inode)
3879 inode_dio_wait(inode_out);
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898 ret = filemap_flush(inode_in->i_mapping);
3899 if (ret < 0)
3900 return ret;
3901
3902 ret = btrfs_wait_ordered_range(inode_in, ALIGN_DOWN(pos_in, bs),
3903 wb_len);
3904 if (ret < 0)
3905 return ret;
3906 ret = btrfs_wait_ordered_range(inode_out, ALIGN_DOWN(pos_out, bs),
3907 wb_len);
3908 if (ret < 0)
3909 return ret;
3910
3911 return generic_remap_file_range_prep(file_in, pos_in, file_out, pos_out,
3912 len, remap_flags);
3913 }
3914
3915 loff_t btrfs_remap_file_range(struct file *src_file, loff_t off,
3916 struct file *dst_file, loff_t destoff, loff_t len,
3917 unsigned int remap_flags)
3918 {
3919 struct inode *src_inode = file_inode(src_file);
3920 struct inode *dst_inode = file_inode(dst_file);
3921 bool same_inode = dst_inode == src_inode;
3922 int ret;
3923
3924 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
3925 return -EINVAL;
3926
3927 if (same_inode)
3928 inode_lock(src_inode);
3929 else
3930 lock_two_nondirectories(src_inode, dst_inode);
3931
3932 ret = btrfs_remap_file_range_prep(src_file, off, dst_file, destoff,
3933 &len, remap_flags);
3934 if (ret < 0 || len == 0)
3935 goto out_unlock;
3936
3937 if (remap_flags & REMAP_FILE_DEDUP)
3938 ret = btrfs_extent_same(src_inode, off, len, dst_inode, destoff);
3939 else
3940 ret = btrfs_clone_files(dst_file, src_file, off, len, destoff);
3941
3942 out_unlock:
3943 if (same_inode)
3944 inode_unlock(src_inode);
3945 else
3946 unlock_two_nondirectories(src_inode, dst_inode);
3947
3948 return ret < 0 ? ret : len;
3949 }
3950
3951 static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
3952 {
3953 struct inode *inode = file_inode(file);
3954 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3955 struct btrfs_root *root = BTRFS_I(inode)->root;
3956 struct btrfs_root *new_root;
3957 struct btrfs_dir_item *di;
3958 struct btrfs_trans_handle *trans;
3959 struct btrfs_path *path;
3960 struct btrfs_key location;
3961 struct btrfs_disk_key disk_key;
3962 u64 objectid = 0;
3963 u64 dir_id;
3964 int ret;
3965
3966 if (!capable(CAP_SYS_ADMIN))
3967 return -EPERM;
3968
3969 ret = mnt_want_write_file(file);
3970 if (ret)
3971 return ret;
3972
3973 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
3974 ret = -EFAULT;
3975 goto out;
3976 }
3977
3978 if (!objectid)
3979 objectid = BTRFS_FS_TREE_OBJECTID;
3980
3981 location.objectid = objectid;
3982 location.type = BTRFS_ROOT_ITEM_KEY;
3983 location.offset = (u64)-1;
3984
3985 new_root = btrfs_read_fs_root_no_name(fs_info, &location);
3986 if (IS_ERR(new_root)) {
3987 ret = PTR_ERR(new_root);
3988 goto out;
3989 }
3990 if (!is_fstree(new_root->root_key.objectid)) {
3991 ret = -ENOENT;
3992 goto out;
3993 }
3994
3995 path = btrfs_alloc_path();
3996 if (!path) {
3997 ret = -ENOMEM;
3998 goto out;
3999 }
4000 path->leave_spinning = 1;
4001
4002 trans = btrfs_start_transaction(root, 1);
4003 if (IS_ERR(trans)) {
4004 btrfs_free_path(path);
4005 ret = PTR_ERR(trans);
4006 goto out;
4007 }
4008
4009 dir_id = btrfs_super_root_dir(fs_info->super_copy);
4010 di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path,
4011 dir_id, "default", 7, 1);
4012 if (IS_ERR_OR_NULL(di)) {
4013 btrfs_free_path(path);
4014 btrfs_end_transaction(trans);
4015 btrfs_err(fs_info,
4016 "Umm, you don't have the default diritem, this isn't going to work");
4017 ret = -ENOENT;
4018 goto out;
4019 }
4020
4021 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
4022 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
4023 btrfs_mark_buffer_dirty(path->nodes[0]);
4024 btrfs_free_path(path);
4025
4026 btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL);
4027 btrfs_end_transaction(trans);
4028 out:
4029 mnt_drop_write_file(file);
4030 return ret;
4031 }
4032
4033 static void get_block_group_info(struct list_head *groups_list,
4034 struct btrfs_ioctl_space_info *space)
4035 {
4036 struct btrfs_block_group_cache *block_group;
4037
4038 space->total_bytes = 0;
4039 space->used_bytes = 0;
4040 space->flags = 0;
4041 list_for_each_entry(block_group, groups_list, list) {
4042 space->flags = block_group->flags;
4043 space->total_bytes += block_group->key.offset;
4044 space->used_bytes +=
4045 btrfs_block_group_used(&block_group->item);
4046 }
4047 }
4048
4049 static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info,
4050 void __user *arg)
4051 {
4052 struct btrfs_ioctl_space_args space_args;
4053 struct btrfs_ioctl_space_info space;
4054 struct btrfs_ioctl_space_info *dest;
4055 struct btrfs_ioctl_space_info *dest_orig;
4056 struct btrfs_ioctl_space_info __user *user_dest;
4057 struct btrfs_space_info *info;
4058 static const u64 types[] = {
4059 BTRFS_BLOCK_GROUP_DATA,
4060 BTRFS_BLOCK_GROUP_SYSTEM,
4061 BTRFS_BLOCK_GROUP_METADATA,
4062 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA
4063 };
4064 int num_types = 4;
4065 int alloc_size;
4066 int ret = 0;
4067 u64 slot_count = 0;
4068 int i, c;
4069
4070 if (copy_from_user(&space_args,
4071 (struct btrfs_ioctl_space_args __user *)arg,
4072 sizeof(space_args)))
4073 return -EFAULT;
4074
4075 for (i = 0; i < num_types; i++) {
4076 struct btrfs_space_info *tmp;
4077
4078 info = NULL;
4079 rcu_read_lock();
4080 list_for_each_entry_rcu(tmp, &fs_info->space_info,
4081 list) {
4082 if (tmp->flags == types[i]) {
4083 info = tmp;
4084 break;
4085 }
4086 }
4087 rcu_read_unlock();
4088
4089 if (!info)
4090 continue;
4091
4092 down_read(&info->groups_sem);
4093 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
4094 if (!list_empty(&info->block_groups[c]))
4095 slot_count++;
4096 }
4097 up_read(&info->groups_sem);
4098 }
4099
4100
4101
4102
4103 slot_count++;
4104
4105
4106 if (space_args.space_slots == 0) {
4107 space_args.total_spaces = slot_count;
4108 goto out;
4109 }
4110
4111 slot_count = min_t(u64, space_args.space_slots, slot_count);
4112
4113 alloc_size = sizeof(*dest) * slot_count;
4114
4115
4116
4117
4118 if (alloc_size > PAGE_SIZE)
4119 return -ENOMEM;
4120
4121 space_args.total_spaces = 0;
4122 dest = kmalloc(alloc_size, GFP_KERNEL);
4123 if (!dest)
4124 return -ENOMEM;
4125 dest_orig = dest;
4126
4127
4128 for (i = 0; i < num_types; i++) {
4129 struct btrfs_space_info *tmp;
4130
4131 if (!slot_count)
4132 break;
4133
4134 info = NULL;
4135 rcu_read_lock();
4136 list_for_each_entry_rcu(tmp, &fs_info->space_info,
4137 list) {
4138 if (tmp->flags == types[i]) {
4139 info = tmp;
4140 break;
4141 }
4142 }
4143 rcu_read_unlock();
4144
4145 if (!info)
4146 continue;
4147 down_read(&info->groups_sem);
4148 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
4149 if (!list_empty(&info->block_groups[c])) {
4150 get_block_group_info(&info->block_groups[c],
4151 &space);
4152 memcpy(dest, &space, sizeof(space));
4153 dest++;
4154 space_args.total_spaces++;
4155 slot_count--;
4156 }
4157 if (!slot_count)
4158 break;
4159 }
4160 up_read(&info->groups_sem);
4161 }
4162
4163
4164
4165
4166 if (slot_count) {
4167 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
4168
4169 spin_lock(&block_rsv->lock);
4170 space.total_bytes = block_rsv->size;
4171 space.used_bytes = block_rsv->size - block_rsv->reserved;
4172 spin_unlock(&block_rsv->lock);
4173 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
4174 memcpy(dest, &space, sizeof(space));
4175 space_args.total_spaces++;
4176 }
4177
4178 user_dest = (struct btrfs_ioctl_space_info __user *)
4179 (arg + sizeof(struct btrfs_ioctl_space_args));
4180
4181 if (copy_to_user(user_dest, dest_orig, alloc_size))
4182 ret = -EFAULT;
4183
4184 kfree(dest_orig);
4185 out:
4186 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
4187 ret = -EFAULT;
4188
4189 return ret;
4190 }
4191
4192 static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
4193 void __user *argp)
4194 {
4195 struct btrfs_trans_handle *trans;
4196 u64 transid;
4197 int ret;
4198
4199 trans = btrfs_attach_transaction_barrier(root);
4200 if (IS_ERR(trans)) {
4201 if (PTR_ERR(trans) != -ENOENT)
4202 return PTR_ERR(trans);
4203
4204
4205 transid = root->fs_info->last_trans_committed;
4206 goto out;
4207 }
4208 transid = trans->transid;
4209 ret = btrfs_commit_transaction_async(trans, 0);
4210 if (ret) {
4211 btrfs_end_transaction(trans);
4212 return ret;
4213 }
4214 out:
4215 if (argp)
4216 if (copy_to_user(argp, &transid, sizeof(transid)))
4217 return -EFAULT;
4218 return 0;
4219 }
4220
4221 static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info,
4222 void __user *argp)
4223 {
4224 u64 transid;
4225
4226 if (argp) {
4227 if (copy_from_user(&transid, argp, sizeof(transid)))
4228 return -EFAULT;
4229 } else {
4230 transid = 0;
4231 }
4232 return btrfs_wait_for_commit(fs_info, transid);
4233 }
4234
4235 static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
4236 {
4237 struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
4238 struct btrfs_ioctl_scrub_args *sa;
4239 int ret;
4240
4241 if (!capable(CAP_SYS_ADMIN))
4242 return -EPERM;
4243
4244 sa = memdup_user(arg, sizeof(*sa));
4245 if (IS_ERR(sa))
4246 return PTR_ERR(sa);
4247
4248 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
4249 ret = mnt_want_write_file(file);
4250 if (ret)
4251 goto out;
4252 }
4253
4254 ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end,
4255 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
4256 0);
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270 if (copy_to_user(arg, sa, sizeof(*sa)))
4271 ret = -EFAULT;
4272
4273 if (!(sa->flags & BTRFS_SCRUB_READONLY))
4274 mnt_drop_write_file(file);
4275 out:
4276 kfree(sa);
4277 return ret;
4278 }
4279
4280 static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info)
4281 {
4282 if (!capable(CAP_SYS_ADMIN))
4283 return -EPERM;
4284
4285 return btrfs_scrub_cancel(fs_info);
4286 }
4287
4288 static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info,
4289 void __user *arg)
4290 {
4291 struct btrfs_ioctl_scrub_args *sa;
4292 int ret;
4293
4294 if (!capable(CAP_SYS_ADMIN))
4295 return -EPERM;
4296
4297 sa = memdup_user(arg, sizeof(*sa));
4298 if (IS_ERR(sa))
4299 return PTR_ERR(sa);
4300
4301 ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress);
4302
4303 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
4304 ret = -EFAULT;
4305
4306 kfree(sa);
4307 return ret;
4308 }
4309
4310 static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info,
4311 void __user *arg)
4312 {
4313 struct btrfs_ioctl_get_dev_stats *sa;
4314 int ret;
4315
4316 sa = memdup_user(arg, sizeof(*sa));
4317 if (IS_ERR(sa))
4318 return PTR_ERR(sa);
4319
4320 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
4321 kfree(sa);
4322 return -EPERM;
4323 }
4324
4325 ret = btrfs_get_dev_stats(fs_info, sa);
4326
4327 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
4328 ret = -EFAULT;
4329
4330 kfree(sa);
4331 return ret;
4332 }
4333
4334 static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info,
4335 void __user *arg)
4336 {
4337 struct btrfs_ioctl_dev_replace_args *p;
4338 int ret;
4339
4340 if (!capable(CAP_SYS_ADMIN))
4341 return -EPERM;
4342
4343 p = memdup_user(arg, sizeof(*p));
4344 if (IS_ERR(p))
4345 return PTR_ERR(p);
4346
4347 switch (p->cmd) {
4348 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
4349 if (sb_rdonly(fs_info->sb)) {
4350 ret = -EROFS;
4351 goto out;
4352 }
4353 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
4354 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4355 } else {
4356 ret = btrfs_dev_replace_by_ioctl(fs_info, p);
4357 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
4358 }
4359 break;
4360 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
4361 btrfs_dev_replace_status(fs_info, p);
4362 ret = 0;
4363 break;
4364 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
4365 p->result = btrfs_dev_replace_cancel(fs_info);
4366 ret = 0;
4367 break;
4368 default:
4369 ret = -EINVAL;
4370 break;
4371 }
4372
4373 if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p)))
4374 ret = -EFAULT;
4375 out:
4376 kfree(p);
4377 return ret;
4378 }
4379
4380 static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
4381 {
4382 int ret = 0;
4383 int i;
4384 u64 rel_ptr;
4385 int size;
4386 struct btrfs_ioctl_ino_path_args *ipa = NULL;
4387 struct inode_fs_paths *ipath = NULL;
4388 struct btrfs_path *path;
4389
4390 if (!capable(CAP_DAC_READ_SEARCH))
4391 return -EPERM;
4392
4393 path = btrfs_alloc_path();
4394 if (!path) {
4395 ret = -ENOMEM;
4396 goto out;
4397 }
4398
4399 ipa = memdup_user(arg, sizeof(*ipa));
4400 if (IS_ERR(ipa)) {
4401 ret = PTR_ERR(ipa);
4402 ipa = NULL;
4403 goto out;
4404 }
4405
4406 size = min_t(u32, ipa->size, 4096);
4407 ipath = init_ipath(size, root, path);
4408 if (IS_ERR(ipath)) {
4409 ret = PTR_ERR(ipath);
4410 ipath = NULL;
4411 goto out;
4412 }
4413
4414 ret = paths_from_inode(ipa->inum, ipath);
4415 if (ret < 0)
4416 goto out;
4417
4418 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
4419 rel_ptr = ipath->fspath->val[i] -
4420 (u64)(unsigned long)ipath->fspath->val;
4421 ipath->fspath->val[i] = rel_ptr;
4422 }
4423
4424 ret = copy_to_user((void __user *)(unsigned long)ipa->fspath,
4425 ipath->fspath, size);
4426 if (ret) {
4427 ret = -EFAULT;
4428 goto out;
4429 }
4430
4431 out:
4432 btrfs_free_path(path);
4433 free_ipath(ipath);
4434 kfree(ipa);
4435
4436 return ret;
4437 }
4438
4439 static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
4440 {
4441 struct btrfs_data_container *inodes = ctx;
4442 const size_t c = 3 * sizeof(u64);
4443
4444 if (inodes->bytes_left >= c) {
4445 inodes->bytes_left -= c;
4446 inodes->val[inodes->elem_cnt] = inum;
4447 inodes->val[inodes->elem_cnt + 1] = offset;
4448 inodes->val[inodes->elem_cnt + 2] = root;
4449 inodes->elem_cnt += 3;
4450 } else {
4451 inodes->bytes_missing += c - inodes->bytes_left;
4452 inodes->bytes_left = 0;
4453 inodes->elem_missed += 3;
4454 }
4455
4456 return 0;
4457 }
4458
4459 static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
4460 void __user *arg, int version)
4461 {
4462 int ret = 0;
4463 int size;
4464 struct btrfs_ioctl_logical_ino_args *loi;
4465 struct btrfs_data_container *inodes = NULL;
4466 struct btrfs_path *path = NULL;
4467 bool ignore_offset;
4468
4469 if (!capable(CAP_SYS_ADMIN))
4470 return -EPERM;
4471
4472 loi = memdup_user(arg, sizeof(*loi));
4473 if (IS_ERR(loi))
4474 return PTR_ERR(loi);
4475
4476 if (version == 1) {
4477 ignore_offset = false;
4478 size = min_t(u32, loi->size, SZ_64K);
4479 } else {
4480
4481 if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) {
4482 ret = -EINVAL;
4483 goto out_loi;
4484 }
4485
4486 if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) {
4487 ret = -EINVAL;
4488 goto out_loi;
4489 }
4490 ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET;
4491 size = min_t(u32, loi->size, SZ_16M);
4492 }
4493
4494 path = btrfs_alloc_path();
4495 if (!path) {
4496 ret = -ENOMEM;
4497 goto out;
4498 }
4499
4500 inodes = init_data_container(size);
4501 if (IS_ERR(inodes)) {
4502 ret = PTR_ERR(inodes);
4503 inodes = NULL;
4504 goto out;
4505 }
4506
4507 ret = iterate_inodes_from_logical(loi->logical, fs_info, path,
4508 build_ino_list, inodes, ignore_offset);
4509 if (ret == -EINVAL)
4510 ret = -ENOENT;
4511 if (ret < 0)
4512 goto out;
4513
4514 ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes,
4515 size);
4516 if (ret)
4517 ret = -EFAULT;
4518
4519 out:
4520 btrfs_free_path(path);
4521 kvfree(inodes);
4522 out_loi:
4523 kfree(loi);
4524
4525 return ret;
4526 }
4527
4528 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
4529 struct btrfs_ioctl_balance_args *bargs)
4530 {
4531 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
4532
4533 bargs->flags = bctl->flags;
4534
4535 if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags))
4536 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
4537 if (atomic_read(&fs_info->balance_pause_req))
4538 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
4539 if (atomic_read(&fs_info->balance_cancel_req))
4540 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
4541
4542 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
4543 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
4544 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
4545
4546 spin_lock(&fs_info->balance_lock);
4547 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4548 spin_unlock(&fs_info->balance_lock);
4549 }
4550
4551 static long btrfs_ioctl_balance(struct file *file, void __user *arg)
4552 {
4553 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4554 struct btrfs_fs_info *fs_info = root->fs_info;
4555 struct btrfs_ioctl_balance_args *bargs;
4556 struct btrfs_balance_control *bctl;
4557 bool need_unlock;
4558 int ret;
4559
4560 if (!capable(CAP_SYS_ADMIN))
4561 return -EPERM;
4562
4563 ret = mnt_want_write_file(file);
4564 if (ret)
4565 return ret;
4566
4567 again:
4568 if (!test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
4569 mutex_lock(&fs_info->balance_mutex);
4570 need_unlock = true;
4571 goto locked;
4572 }
4573
4574
4575
4576
4577
4578
4579
4580 mutex_lock(&fs_info->balance_mutex);
4581 if (fs_info->balance_ctl) {
4582
4583 if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
4584 mutex_unlock(&fs_info->balance_mutex);
4585
4586
4587
4588
4589 mutex_lock(&fs_info->balance_mutex);
4590
4591 if (fs_info->balance_ctl &&
4592 !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
4593
4594 need_unlock = false;
4595 goto locked;
4596 }
4597
4598 mutex_unlock(&fs_info->balance_mutex);
4599 goto again;
4600 } else {
4601
4602 mutex_unlock(&fs_info->balance_mutex);
4603 ret = -EINPROGRESS;
4604 goto out;
4605 }
4606 } else {
4607
4608 mutex_unlock(&fs_info->balance_mutex);
4609 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4610 goto out;
4611 }
4612
4613 locked:
4614 BUG_ON(!test_bit(BTRFS_FS_EXCL_OP, &fs_info->flags));
4615
4616 if (arg) {
4617 bargs = memdup_user(arg, sizeof(*bargs));
4618 if (IS_ERR(bargs)) {
4619 ret = PTR_ERR(bargs);
4620 goto out_unlock;
4621 }
4622
4623 if (bargs->flags & BTRFS_BALANCE_RESUME) {
4624 if (!fs_info->balance_ctl) {
4625 ret = -ENOTCONN;
4626 goto out_bargs;
4627 }
4628
4629 bctl = fs_info->balance_ctl;
4630 spin_lock(&fs_info->balance_lock);
4631 bctl->flags |= BTRFS_BALANCE_RESUME;
4632 spin_unlock(&fs_info->balance_lock);
4633
4634 goto do_balance;
4635 }
4636 } else {
4637 bargs = NULL;
4638 }
4639
4640 if (fs_info->balance_ctl) {
4641 ret = -EINPROGRESS;
4642 goto out_bargs;
4643 }
4644
4645 bctl = kzalloc(sizeof(*bctl), GFP_KERNEL);
4646 if (!bctl) {
4647 ret = -ENOMEM;
4648 goto out_bargs;
4649 }
4650
4651 if (arg) {
4652 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
4653 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
4654 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
4655
4656 bctl->flags = bargs->flags;
4657 } else {
4658
4659 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
4660 }
4661
4662 if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
4663 ret = -EINVAL;
4664 goto out_bctl;
4665 }
4666
4667 do_balance:
4668
4669
4670
4671
4672
4673
4674 need_unlock = false;
4675
4676 ret = btrfs_balance(fs_info, bctl, bargs);
4677 bctl = NULL;
4678
4679 if ((ret == 0 || ret == -ECANCELED) && arg) {
4680 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4681 ret = -EFAULT;
4682 }
4683
4684 out_bctl:
4685 kfree(bctl);
4686 out_bargs:
4687 kfree(bargs);
4688 out_unlock:
4689 mutex_unlock(&fs_info->balance_mutex);
4690 if (need_unlock)
4691 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
4692 out:
4693 mnt_drop_write_file(file);
4694 return ret;
4695 }
4696
4697 static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd)
4698 {
4699 if (!capable(CAP_SYS_ADMIN))
4700 return -EPERM;
4701
4702 switch (cmd) {
4703 case BTRFS_BALANCE_CTL_PAUSE:
4704 return btrfs_pause_balance(fs_info);
4705 case BTRFS_BALANCE_CTL_CANCEL:
4706 return btrfs_cancel_balance(fs_info);
4707 }
4708
4709 return -EINVAL;
4710 }
4711
4712 static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info,
4713 void __user *arg)
4714 {
4715 struct btrfs_ioctl_balance_args *bargs;
4716 int ret = 0;
4717
4718 if (!capable(CAP_SYS_ADMIN))
4719 return -EPERM;
4720
4721 mutex_lock(&fs_info->balance_mutex);
4722 if (!fs_info->balance_ctl) {
4723 ret = -ENOTCONN;
4724 goto out;
4725 }
4726
4727 bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
4728 if (!bargs) {
4729 ret = -ENOMEM;
4730 goto out;
4731 }
4732
4733 btrfs_update_ioctl_balance_args(fs_info, bargs);
4734
4735 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4736 ret = -EFAULT;
4737
4738 kfree(bargs);
4739 out:
4740 mutex_unlock(&fs_info->balance_mutex);
4741 return ret;
4742 }
4743
4744 static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
4745 {
4746 struct inode *inode = file_inode(file);
4747 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4748 struct btrfs_ioctl_quota_ctl_args *sa;
4749 int ret;
4750
4751 if (!capable(CAP_SYS_ADMIN))
4752 return -EPERM;
4753
4754 ret = mnt_want_write_file(file);
4755 if (ret)
4756 return ret;
4757
4758 sa = memdup_user(arg, sizeof(*sa));
4759 if (IS_ERR(sa)) {
4760 ret = PTR_ERR(sa);
4761 goto drop_write;
4762 }
4763
4764 down_write(&fs_info->subvol_sem);
4765
4766 switch (sa->cmd) {
4767 case BTRFS_QUOTA_CTL_ENABLE:
4768 ret = btrfs_quota_enable(fs_info);
4769 break;
4770 case BTRFS_QUOTA_CTL_DISABLE:
4771 ret = btrfs_quota_disable(fs_info);
4772 break;
4773 default:
4774 ret = -EINVAL;
4775 break;
4776 }
4777
4778 kfree(sa);
4779 up_write(&fs_info->subvol_sem);
4780 drop_write:
4781 mnt_drop_write_file(file);
4782 return ret;
4783 }
4784
4785 static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
4786 {
4787 struct inode *inode = file_inode(file);
4788 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4789 struct btrfs_root *root = BTRFS_I(inode)->root;
4790 struct btrfs_ioctl_qgroup_assign_args *sa;
4791 struct btrfs_trans_handle *trans;
4792 int ret;
4793 int err;
4794
4795 if (!capable(CAP_SYS_ADMIN))
4796 return -EPERM;
4797
4798 ret = mnt_want_write_file(file);
4799 if (ret)
4800 return ret;
4801
4802 sa = memdup_user(arg, sizeof(*sa));
4803 if (IS_ERR(sa)) {
4804 ret = PTR_ERR(sa);
4805 goto drop_write;
4806 }
4807
4808 trans = btrfs_join_transaction(root);
4809 if (IS_ERR(trans)) {
4810 ret = PTR_ERR(trans);
4811 goto out;
4812 }
4813
4814 if (sa->assign) {
4815 ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst);
4816 } else {
4817 ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst);
4818 }
4819
4820
4821 err = btrfs_run_qgroups(trans);
4822 if (err < 0)
4823 btrfs_handle_fs_error(fs_info, err,
4824 "failed to update qgroup status and info");
4825 err = btrfs_end_transaction(trans);
4826 if (err && !ret)
4827 ret = err;
4828
4829 out:
4830 kfree(sa);
4831 drop_write:
4832 mnt_drop_write_file(file);
4833 return ret;
4834 }
4835
4836 static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
4837 {
4838 struct inode *inode = file_inode(file);
4839 struct btrfs_root *root = BTRFS_I(inode)->root;
4840 struct btrfs_ioctl_qgroup_create_args *sa;
4841 struct btrfs_trans_handle *trans;
4842 int ret;
4843 int err;
4844
4845 if (!capable(CAP_SYS_ADMIN))
4846 return -EPERM;
4847
4848 ret = mnt_want_write_file(file);
4849 if (ret)
4850 return ret;
4851
4852 sa = memdup_user(arg, sizeof(*sa));
4853 if (IS_ERR(sa)) {
4854 ret = PTR_ERR(sa);
4855 goto drop_write;
4856 }
4857
4858 if (!sa->qgroupid) {
4859 ret = -EINVAL;
4860 goto out;
4861 }
4862
4863 trans = btrfs_join_transaction(root);
4864 if (IS_ERR(trans)) {
4865 ret = PTR_ERR(trans);
4866 goto out;
4867 }
4868
4869 if (sa->create) {
4870 ret = btrfs_create_qgroup(trans, sa->qgroupid);
4871 } else {
4872 ret = btrfs_remove_qgroup(trans, sa->qgroupid);
4873 }
4874
4875 err = btrfs_end_transaction(trans);
4876 if (err && !ret)
4877 ret = err;
4878
4879 out:
4880 kfree(sa);
4881 drop_write:
4882 mnt_drop_write_file(file);
4883 return ret;
4884 }
4885
4886 static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
4887 {
4888 struct inode *inode = file_inode(file);
4889 struct btrfs_root *root = BTRFS_I(inode)->root;
4890 struct btrfs_ioctl_qgroup_limit_args *sa;
4891 struct btrfs_trans_handle *trans;
4892 int ret;
4893 int err;
4894 u64 qgroupid;
4895
4896 if (!capable(CAP_SYS_ADMIN))
4897 return -EPERM;
4898
4899 ret = mnt_want_write_file(file);
4900 if (ret)
4901 return ret;
4902
4903 sa = memdup_user(arg, sizeof(*sa));
4904 if (IS_ERR(sa)) {
4905 ret = PTR_ERR(sa);
4906 goto drop_write;
4907 }
4908
4909 trans = btrfs_join_transaction(root);
4910 if (IS_ERR(trans)) {
4911 ret = PTR_ERR(trans);
4912 goto out;
4913 }
4914
4915 qgroupid = sa->qgroupid;
4916 if (!qgroupid) {
4917
4918 qgroupid = root->root_key.objectid;
4919 }
4920
4921 ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim);
4922
4923 err = btrfs_end_transaction(trans);
4924 if (err && !ret)
4925 ret = err;
4926
4927 out:
4928 kfree(sa);
4929 drop_write:
4930 mnt_drop_write_file(file);
4931 return ret;
4932 }
4933
4934 static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
4935 {
4936 struct inode *inode = file_inode(file);
4937 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4938 struct btrfs_ioctl_quota_rescan_args *qsa;
4939 int ret;
4940
4941 if (!capable(CAP_SYS_ADMIN))
4942 return -EPERM;
4943
4944 ret = mnt_want_write_file(file);
4945 if (ret)
4946 return ret;
4947
4948 qsa = memdup_user(arg, sizeof(*qsa));
4949 if (IS_ERR(qsa)) {
4950 ret = PTR_ERR(qsa);
4951 goto drop_write;
4952 }
4953
4954 if (qsa->flags) {
4955 ret = -EINVAL;
4956 goto out;
4957 }
4958
4959 ret = btrfs_qgroup_rescan(fs_info);
4960
4961 out:
4962 kfree(qsa);
4963 drop_write:
4964 mnt_drop_write_file(file);
4965 return ret;
4966 }
4967
4968 static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
4969 {
4970 struct inode *inode = file_inode(file);
4971 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4972 struct btrfs_ioctl_quota_rescan_args *qsa;
4973 int ret = 0;
4974
4975 if (!capable(CAP_SYS_ADMIN))
4976 return -EPERM;
4977
4978 qsa = kzalloc(sizeof(*qsa), GFP_KERNEL);
4979 if (!qsa)
4980 return -ENOMEM;
4981
4982 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
4983 qsa->flags = 1;
4984 qsa->progress = fs_info->qgroup_rescan_progress.objectid;
4985 }
4986
4987 if (copy_to_user(arg, qsa, sizeof(*qsa)))
4988 ret = -EFAULT;
4989
4990 kfree(qsa);
4991 return ret;
4992 }
4993
4994 static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
4995 {
4996 struct inode *inode = file_inode(file);
4997 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4998
4999 if (!capable(CAP_SYS_ADMIN))
5000 return -EPERM;
5001
5002 return btrfs_qgroup_wait_for_completion(fs_info, true);
5003 }
5004
5005 static long _btrfs_ioctl_set_received_subvol(struct file *file,
5006 struct btrfs_ioctl_received_subvol_args *sa)
5007 {
5008 struct inode *inode = file_inode(file);
5009 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5010 struct btrfs_root *root = BTRFS_I(inode)->root;
5011 struct btrfs_root_item *root_item = &root->root_item;
5012 struct btrfs_trans_handle *trans;
5013 struct timespec64 ct = current_time(inode);
5014 int ret = 0;
5015 int received_uuid_changed;
5016
5017 if (!inode_owner_or_capable(inode))
5018 return -EPERM;
5019
5020 ret = mnt_want_write_file(file);
5021 if (ret < 0)
5022 return ret;
5023
5024 down_write(&fs_info->subvol_sem);
5025
5026 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
5027 ret = -EINVAL;
5028 goto out;
5029 }
5030
5031 if (btrfs_root_readonly(root)) {
5032 ret = -EROFS;
5033 goto out;
5034 }
5035
5036
5037
5038
5039
5040 trans = btrfs_start_transaction(root, 3);
5041 if (IS_ERR(trans)) {
5042 ret = PTR_ERR(trans);
5043 trans = NULL;
5044 goto out;
5045 }
5046
5047 sa->rtransid = trans->transid;
5048 sa->rtime.sec = ct.tv_sec;
5049 sa->rtime.nsec = ct.tv_nsec;
5050
5051 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
5052 BTRFS_UUID_SIZE);
5053 if (received_uuid_changed &&
5054 !btrfs_is_empty_uuid(root_item->received_uuid)) {
5055 ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid,
5056 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
5057 root->root_key.objectid);
5058 if (ret && ret != -ENOENT) {
5059 btrfs_abort_transaction(trans, ret);
5060 btrfs_end_transaction(trans);
5061 goto out;
5062 }
5063 }
5064 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
5065 btrfs_set_root_stransid(root_item, sa->stransid);
5066 btrfs_set_root_rtransid(root_item, sa->rtransid);
5067 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
5068 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
5069 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
5070 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
5071
5072 ret = btrfs_update_root(trans, fs_info->tree_root,
5073 &root->root_key, &root->root_item);
5074 if (ret < 0) {
5075 btrfs_end_transaction(trans);
5076 goto out;
5077 }
5078 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
5079 ret = btrfs_uuid_tree_add(trans, sa->uuid,
5080 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
5081 root->root_key.objectid);
5082 if (ret < 0 && ret != -EEXIST) {
5083 btrfs_abort_transaction(trans, ret);
5084 btrfs_end_transaction(trans);
5085 goto out;
5086 }
5087 }
5088 ret = btrfs_commit_transaction(trans);
5089 out:
5090 up_write(&fs_info->subvol_sem);
5091 mnt_drop_write_file(file);
5092 return ret;
5093 }
5094
5095 #ifdef CONFIG_64BIT
5096 static long btrfs_ioctl_set_received_subvol_32(struct file *file,
5097 void __user *arg)
5098 {
5099 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
5100 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
5101 int ret = 0;
5102
5103 args32 = memdup_user(arg, sizeof(*args32));
5104 if (IS_ERR(args32))
5105 return PTR_ERR(args32);
5106
5107 args64 = kmalloc(sizeof(*args64), GFP_KERNEL);
5108 if (!args64) {
5109 ret = -ENOMEM;
5110 goto out;
5111 }
5112
5113 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
5114 args64->stransid = args32->stransid;
5115 args64->rtransid = args32->rtransid;
5116 args64->stime.sec = args32->stime.sec;
5117 args64->stime.nsec = args32->stime.nsec;
5118 args64->rtime.sec = args32->rtime.sec;
5119 args64->rtime.nsec = args32->rtime.nsec;
5120 args64->flags = args32->flags;
5121
5122 ret = _btrfs_ioctl_set_received_subvol(file, args64);
5123 if (ret)
5124 goto out;
5125
5126 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
5127 args32->stransid = args64->stransid;
5128 args32->rtransid = args64->rtransid;
5129 args32->stime.sec = args64->stime.sec;
5130 args32->stime.nsec = args64->stime.nsec;
5131 args32->rtime.sec = args64->rtime.sec;
5132 args32->rtime.nsec = args64->rtime.nsec;
5133 args32->flags = args64->flags;
5134
5135 ret = copy_to_user(arg, args32, sizeof(*args32));
5136 if (ret)
5137 ret = -EFAULT;
5138
5139 out:
5140 kfree(args32);
5141 kfree(args64);
5142 return ret;
5143 }
5144 #endif
5145
5146 static long btrfs_ioctl_set_received_subvol(struct file *file,
5147 void __user *arg)
5148 {
5149 struct btrfs_ioctl_received_subvol_args *sa = NULL;
5150 int ret = 0;
5151
5152 sa = memdup_user(arg, sizeof(*sa));
5153 if (IS_ERR(sa))
5154 return PTR_ERR(sa);
5155
5156 ret = _btrfs_ioctl_set_received_subvol(file, sa);
5157
5158 if (ret)
5159 goto out;
5160
5161 ret = copy_to_user(arg, sa, sizeof(*sa));
5162 if (ret)
5163 ret = -EFAULT;
5164
5165 out:
5166 kfree(sa);
5167 return ret;
5168 }
5169
5170 static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
5171 {
5172 struct inode *inode = file_inode(file);
5173 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5174 size_t len;
5175 int ret;
5176 char label[BTRFS_LABEL_SIZE];
5177
5178 spin_lock(&fs_info->super_lock);
5179 memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE);
5180 spin_unlock(&fs_info->super_lock);
5181
5182 len = strnlen(label, BTRFS_LABEL_SIZE);
5183
5184 if (len == BTRFS_LABEL_SIZE) {
5185 btrfs_warn(fs_info,
5186 "label is too long, return the first %zu bytes",
5187 --len);
5188 }
5189
5190 ret = copy_to_user(arg, label, len);
5191
5192 return ret ? -EFAULT : 0;
5193 }
5194
5195 static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
5196 {
5197 struct inode *inode = file_inode(file);
5198 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5199 struct btrfs_root *root = BTRFS_I(inode)->root;
5200 struct btrfs_super_block *super_block = fs_info->super_copy;
5201 struct btrfs_trans_handle *trans;
5202 char label[BTRFS_LABEL_SIZE];
5203 int ret;
5204
5205 if (!capable(CAP_SYS_ADMIN))
5206 return -EPERM;
5207
5208 if (copy_from_user(label, arg, sizeof(label)))
5209 return -EFAULT;
5210
5211 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
5212 btrfs_err(fs_info,
5213 "unable to set label with more than %d bytes",
5214 BTRFS_LABEL_SIZE - 1);
5215 return -EINVAL;
5216 }
5217
5218 ret = mnt_want_write_file(file);
5219 if (ret)
5220 return ret;
5221
5222 trans = btrfs_start_transaction(root, 0);
5223 if (IS_ERR(trans)) {
5224 ret = PTR_ERR(trans);
5225 goto out_unlock;
5226 }
5227
5228 spin_lock(&fs_info->super_lock);
5229 strcpy(super_block->label, label);
5230 spin_unlock(&fs_info->super_lock);
5231 ret = btrfs_commit_transaction(trans);
5232
5233 out_unlock:
5234 mnt_drop_write_file(file);
5235 return ret;
5236 }
5237
5238 #define INIT_FEATURE_FLAGS(suffix) \
5239 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
5240 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
5241 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
5242
5243 int btrfs_ioctl_get_supported_features(void __user *arg)
5244 {
5245 static const struct btrfs_ioctl_feature_flags features[3] = {
5246 INIT_FEATURE_FLAGS(SUPP),
5247 INIT_FEATURE_FLAGS(SAFE_SET),
5248 INIT_FEATURE_FLAGS(SAFE_CLEAR)
5249 };
5250
5251 if (copy_to_user(arg, &features, sizeof(features)))
5252 return -EFAULT;
5253
5254 return 0;
5255 }
5256
5257 static int btrfs_ioctl_get_features(struct file *file, void __user *arg)
5258 {
5259 struct inode *inode = file_inode(file);
5260 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5261 struct btrfs_super_block *super_block = fs_info->super_copy;
5262 struct btrfs_ioctl_feature_flags features;
5263
5264 features.compat_flags = btrfs_super_compat_flags(super_block);
5265 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
5266 features.incompat_flags = btrfs_super_incompat_flags(super_block);
5267
5268 if (copy_to_user(arg, &features, sizeof(features)))
5269 return -EFAULT;
5270
5271 return 0;
5272 }
5273
5274 static int check_feature_bits(struct btrfs_fs_info *fs_info,
5275 enum btrfs_feature_set set,
5276 u64 change_mask, u64 flags, u64 supported_flags,
5277 u64 safe_set, u64 safe_clear)
5278 {
5279 const char *type = btrfs_feature_set_name(set);
5280 char *names;
5281 u64 disallowed, unsupported;
5282 u64 set_mask = flags & change_mask;
5283 u64 clear_mask = ~flags & change_mask;
5284
5285 unsupported = set_mask & ~supported_flags;
5286 if (unsupported) {
5287 names = btrfs_printable_features(set, unsupported);
5288 if (names) {
5289 btrfs_warn(fs_info,
5290 "this kernel does not support the %s feature bit%s",
5291 names, strchr(names, ',') ? "s" : "");
5292 kfree(names);
5293 } else
5294 btrfs_warn(fs_info,
5295 "this kernel does not support %s bits 0x%llx",
5296 type, unsupported);
5297 return -EOPNOTSUPP;
5298 }
5299
5300 disallowed = set_mask & ~safe_set;
5301 if (disallowed) {
5302 names = btrfs_printable_features(set, disallowed);
5303 if (names) {
5304 btrfs_warn(fs_info,
5305 "can't set the %s feature bit%s while mounted",
5306 names, strchr(names, ',') ? "s" : "");
5307 kfree(names);
5308 } else
5309 btrfs_warn(fs_info,
5310 "can't set %s bits 0x%llx while mounted",
5311 type, disallowed);
5312 return -EPERM;
5313 }
5314
5315 disallowed = clear_mask & ~safe_clear;
5316 if (disallowed) {
5317 names = btrfs_printable_features(set, disallowed);
5318 if (names) {
5319 btrfs_warn(fs_info,
5320 "can't clear the %s feature bit%s while mounted",
5321 names, strchr(names, ',') ? "s" : "");
5322 kfree(names);
5323 } else
5324 btrfs_warn(fs_info,
5325 "can't clear %s bits 0x%llx while mounted",
5326 type, disallowed);
5327 return -EPERM;
5328 }
5329
5330 return 0;
5331 }
5332
5333 #define check_feature(fs_info, change_mask, flags, mask_base) \
5334 check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \
5335 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
5336 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
5337 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
5338
5339 static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
5340 {
5341 struct inode *inode = file_inode(file);
5342 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5343 struct btrfs_root *root = BTRFS_I(inode)->root;
5344 struct btrfs_super_block *super_block = fs_info->super_copy;
5345 struct btrfs_ioctl_feature_flags flags[2];
5346 struct btrfs_trans_handle *trans;
5347 u64 newflags;
5348 int ret;
5349
5350 if (!capable(CAP_SYS_ADMIN))
5351 return -EPERM;
5352
5353 if (copy_from_user(flags, arg, sizeof(flags)))
5354 return -EFAULT;
5355
5356
5357 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
5358 !flags[0].incompat_flags)
5359 return 0;
5360
5361 ret = check_feature(fs_info, flags[0].compat_flags,
5362 flags[1].compat_flags, COMPAT);
5363 if (ret)
5364 return ret;
5365
5366 ret = check_feature(fs_info, flags[0].compat_ro_flags,
5367 flags[1].compat_ro_flags, COMPAT_RO);
5368 if (ret)
5369 return ret;
5370
5371 ret = check_feature(fs_info, flags[0].incompat_flags,
5372 flags[1].incompat_flags, INCOMPAT);
5373 if (ret)
5374 return ret;
5375
5376 ret = mnt_want_write_file(file);
5377 if (ret)
5378 return ret;
5379
5380 trans = btrfs_start_transaction(root, 0);
5381 if (IS_ERR(trans)) {
5382 ret = PTR_ERR(trans);
5383 goto out_drop_write;
5384 }
5385
5386 spin_lock(&fs_info->super_lock);
5387 newflags = btrfs_super_compat_flags(super_block);
5388 newflags |= flags[0].compat_flags & flags[1].compat_flags;
5389 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
5390 btrfs_set_super_compat_flags(super_block, newflags);
5391
5392 newflags = btrfs_super_compat_ro_flags(super_block);
5393 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
5394 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
5395 btrfs_set_super_compat_ro_flags(super_block, newflags);
5396
5397 newflags = btrfs_super_incompat_flags(super_block);
5398 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
5399 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
5400 btrfs_set_super_incompat_flags(super_block, newflags);
5401 spin_unlock(&fs_info->super_lock);
5402
5403 ret = btrfs_commit_transaction(trans);
5404 out_drop_write:
5405 mnt_drop_write_file(file);
5406
5407 return ret;
5408 }
5409
5410 static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat)
5411 {
5412 struct btrfs_ioctl_send_args *arg;
5413 int ret;
5414
5415 if (compat) {
5416 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5417 struct btrfs_ioctl_send_args_32 args32;
5418
5419 ret = copy_from_user(&args32, argp, sizeof(args32));
5420 if (ret)
5421 return -EFAULT;
5422 arg = kzalloc(sizeof(*arg), GFP_KERNEL);
5423 if (!arg)
5424 return -ENOMEM;
5425 arg->send_fd = args32.send_fd;
5426 arg->clone_sources_count = args32.clone_sources_count;
5427 arg->clone_sources = compat_ptr(args32.clone_sources);
5428 arg->parent_root = args32.parent_root;
5429 arg->flags = args32.flags;
5430 memcpy(arg->reserved, args32.reserved,
5431 sizeof(args32.reserved));
5432 #else
5433 return -ENOTTY;
5434 #endif
5435 } else {
5436 arg = memdup_user(argp, sizeof(*arg));
5437 if (IS_ERR(arg))
5438 return PTR_ERR(arg);
5439 }
5440 ret = btrfs_ioctl_send(file, arg);
5441 kfree(arg);
5442 return ret;
5443 }
5444
5445 long btrfs_ioctl(struct file *file, unsigned int
5446 cmd, unsigned long arg)
5447 {
5448 struct inode *inode = file_inode(file);
5449 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5450 struct btrfs_root *root = BTRFS_I(inode)->root;
5451 void __user *argp = (void __user *)arg;
5452
5453 switch (cmd) {
5454 case FS_IOC_GETFLAGS:
5455 return btrfs_ioctl_getflags(file, argp);
5456 case FS_IOC_SETFLAGS:
5457 return btrfs_ioctl_setflags(file, argp);
5458 case FS_IOC_GETVERSION:
5459 return btrfs_ioctl_getversion(file, argp);
5460 case FS_IOC_GETFSLABEL:
5461 return btrfs_ioctl_get_fslabel(file, argp);
5462 case FS_IOC_SETFSLABEL:
5463 return btrfs_ioctl_set_fslabel(file, argp);
5464 case FITRIM:
5465 return btrfs_ioctl_fitrim(file, argp);
5466 case BTRFS_IOC_SNAP_CREATE:
5467 return btrfs_ioctl_snap_create(file, argp, 0);
5468 case BTRFS_IOC_SNAP_CREATE_V2:
5469 return btrfs_ioctl_snap_create_v2(file, argp, 0);
5470 case BTRFS_IOC_SUBVOL_CREATE:
5471 return btrfs_ioctl_snap_create(file, argp, 1);
5472 case BTRFS_IOC_SUBVOL_CREATE_V2:
5473 return btrfs_ioctl_snap_create_v2(file, argp, 1);
5474 case BTRFS_IOC_SNAP_DESTROY:
5475 return btrfs_ioctl_snap_destroy(file, argp);
5476 case BTRFS_IOC_SUBVOL_GETFLAGS:
5477 return btrfs_ioctl_subvol_getflags(file, argp);
5478 case BTRFS_IOC_SUBVOL_SETFLAGS:
5479 return btrfs_ioctl_subvol_setflags(file, argp);
5480 case BTRFS_IOC_DEFAULT_SUBVOL:
5481 return btrfs_ioctl_default_subvol(file, argp);
5482 case BTRFS_IOC_DEFRAG:
5483 return btrfs_ioctl_defrag(file, NULL);
5484 case BTRFS_IOC_DEFRAG_RANGE:
5485 return btrfs_ioctl_defrag(file, argp);
5486 case BTRFS_IOC_RESIZE:
5487 return btrfs_ioctl_resize(file, argp);
5488 case BTRFS_IOC_ADD_DEV:
5489 return btrfs_ioctl_add_dev(fs_info, argp);
5490 case BTRFS_IOC_RM_DEV:
5491 return btrfs_ioctl_rm_dev(file, argp);
5492 case BTRFS_IOC_RM_DEV_V2:
5493 return btrfs_ioctl_rm_dev_v2(file, argp);
5494 case BTRFS_IOC_FS_INFO:
5495 return btrfs_ioctl_fs_info(fs_info, argp);
5496 case BTRFS_IOC_DEV_INFO:
5497 return btrfs_ioctl_dev_info(fs_info, argp);
5498 case BTRFS_IOC_BALANCE:
5499 return btrfs_ioctl_balance(file, NULL);
5500 case BTRFS_IOC_TREE_SEARCH:
5501 return btrfs_ioctl_tree_search(file, argp);
5502 case BTRFS_IOC_TREE_SEARCH_V2:
5503 return btrfs_ioctl_tree_search_v2(file, argp);
5504 case BTRFS_IOC_INO_LOOKUP:
5505 return btrfs_ioctl_ino_lookup(file, argp);
5506 case BTRFS_IOC_INO_PATHS:
5507 return btrfs_ioctl_ino_to_path(root, argp);
5508 case BTRFS_IOC_LOGICAL_INO:
5509 return btrfs_ioctl_logical_to_ino(fs_info, argp, 1);
5510 case BTRFS_IOC_LOGICAL_INO_V2:
5511 return btrfs_ioctl_logical_to_ino(fs_info, argp, 2);
5512 case BTRFS_IOC_SPACE_INFO:
5513 return btrfs_ioctl_space_info(fs_info, argp);
5514 case BTRFS_IOC_SYNC: {
5515 int ret;
5516
5517 ret = btrfs_start_delalloc_roots(fs_info, -1);
5518 if (ret)
5519 return ret;
5520 ret = btrfs_sync_fs(inode->i_sb, 1);
5521
5522
5523
5524
5525
5526 wake_up_process(fs_info->transaction_kthread);
5527 return ret;
5528 }
5529 case BTRFS_IOC_START_SYNC:
5530 return btrfs_ioctl_start_sync(root, argp);
5531 case BTRFS_IOC_WAIT_SYNC:
5532 return btrfs_ioctl_wait_sync(fs_info, argp);
5533 case BTRFS_IOC_SCRUB:
5534 return btrfs_ioctl_scrub(file, argp);
5535 case BTRFS_IOC_SCRUB_CANCEL:
5536 return btrfs_ioctl_scrub_cancel(fs_info);
5537 case BTRFS_IOC_SCRUB_PROGRESS:
5538 return btrfs_ioctl_scrub_progress(fs_info, argp);
5539 case BTRFS_IOC_BALANCE_V2:
5540 return btrfs_ioctl_balance(file, argp);
5541 case BTRFS_IOC_BALANCE_CTL:
5542 return btrfs_ioctl_balance_ctl(fs_info, arg);
5543 case BTRFS_IOC_BALANCE_PROGRESS:
5544 return btrfs_ioctl_balance_progress(fs_info, argp);
5545 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
5546 return btrfs_ioctl_set_received_subvol(file, argp);
5547 #ifdef CONFIG_64BIT
5548 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
5549 return btrfs_ioctl_set_received_subvol_32(file, argp);
5550 #endif
5551 case BTRFS_IOC_SEND:
5552 return _btrfs_ioctl_send(file, argp, false);
5553 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5554 case BTRFS_IOC_SEND_32:
5555 return _btrfs_ioctl_send(file, argp, true);
5556 #endif
5557 case BTRFS_IOC_GET_DEV_STATS:
5558 return btrfs_ioctl_get_dev_stats(fs_info, argp);
5559 case BTRFS_IOC_QUOTA_CTL:
5560 return btrfs_ioctl_quota_ctl(file, argp);
5561 case BTRFS_IOC_QGROUP_ASSIGN:
5562 return btrfs_ioctl_qgroup_assign(file, argp);
5563 case BTRFS_IOC_QGROUP_CREATE:
5564 return btrfs_ioctl_qgroup_create(file, argp);
5565 case BTRFS_IOC_QGROUP_LIMIT:
5566 return btrfs_ioctl_qgroup_limit(file, argp);
5567 case BTRFS_IOC_QUOTA_RESCAN:
5568 return btrfs_ioctl_quota_rescan(file, argp);
5569 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
5570 return btrfs_ioctl_quota_rescan_status(file, argp);
5571 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
5572 return btrfs_ioctl_quota_rescan_wait(file, argp);
5573 case BTRFS_IOC_DEV_REPLACE:
5574 return btrfs_ioctl_dev_replace(fs_info, argp);
5575 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
5576 return btrfs_ioctl_get_supported_features(argp);
5577 case BTRFS_IOC_GET_FEATURES:
5578 return btrfs_ioctl_get_features(file, argp);
5579 case BTRFS_IOC_SET_FEATURES:
5580 return btrfs_ioctl_set_features(file, argp);
5581 case FS_IOC_FSGETXATTR:
5582 return btrfs_ioctl_fsgetxattr(file, argp);
5583 case FS_IOC_FSSETXATTR:
5584 return btrfs_ioctl_fssetxattr(file, argp);
5585 case BTRFS_IOC_GET_SUBVOL_INFO:
5586 return btrfs_ioctl_get_subvol_info(file, argp);
5587 case BTRFS_IOC_GET_SUBVOL_ROOTREF:
5588 return btrfs_ioctl_get_subvol_rootref(file, argp);
5589 case BTRFS_IOC_INO_LOOKUP_USER:
5590 return btrfs_ioctl_ino_lookup_user(file, argp);
5591 }
5592
5593 return -ENOTTY;
5594 }
5595
5596 #ifdef CONFIG_COMPAT
5597 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
5598 {
5599
5600
5601
5602
5603 switch (cmd) {
5604 case FS_IOC32_GETFLAGS:
5605 cmd = FS_IOC_GETFLAGS;
5606 break;
5607 case FS_IOC32_SETFLAGS:
5608 cmd = FS_IOC_SETFLAGS;
5609 break;
5610 case FS_IOC32_GETVERSION:
5611 cmd = FS_IOC_GETVERSION;
5612 break;
5613 }
5614
5615 return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
5616 }
5617 #endif