1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2007 Oracle. All rights reserved.
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
47 #ifdef CONFIG_64BIT
48 /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
49 * structures are incorrect, as the timespec structure from userspace
50 * is 4 bytes too small. We define these alternatives here to teach
51 * the kernel about the 32-bit struct packing.
52 */
53 struct btrfs_ioctl_timespec_32 {
54 __u64 sec;
55 __u32 nsec;
56 } __attribute__ ((__packed__));
57
58 struct btrfs_ioctl_received_subvol_args_32 {
59 char uuid[BTRFS_UUID_SIZE]; /* in */
60 __u64 stransid; /* in */
61 __u64 rtransid; /* out */
62 struct btrfs_ioctl_timespec_32 stime; /* in */
63 struct btrfs_ioctl_timespec_32 rtime; /* out */
64 __u64 flags; /* in */
65 __u64 reserved[16]; /* in */
66 } __attribute__ ((__packed__));
67
68 #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
69 struct btrfs_ioctl_received_subvol_args_32)
70 #endif
71
72 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
73 struct btrfs_ioctl_send_args_32 {
74 __s64 send_fd; /* in */
75 __u64 clone_sources_count; /* in */
76 compat_uptr_t clone_sources; /* in */
77 __u64 parent_root; /* in */
78 __u64 flags; /* in */
79 __u64 reserved[4]; /* in */
80 } __attribute__ ((__packed__));
81
82 #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \
83 struct btrfs_ioctl_send_args_32)
84 #endif
85
86 static int btrfs_clone(struct inode *src, struct inode *inode,
87 u64 off, u64 olen, u64 olen_aligned, u64 destoff,
88 int no_time_update);
89
90 /* Mask out flags that are inappropriate for the given type of inode. */
91 static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode,
92 unsigned int flags)
93 {
94 if (S_ISDIR(inode->i_mode))
95 return flags;
96 else if (S_ISREG(inode->i_mode))
97 return flags & ~FS_DIRSYNC_FL;
98 else
99 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
100 }
101
102 /*
103 * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS
104 * ioctl.
105 */
106 static unsigned int btrfs_inode_flags_to_fsflags(unsigned int flags)
107 {
108 unsigned int iflags = 0;
109
110 if (flags & BTRFS_INODE_SYNC)
111 iflags |= FS_SYNC_FL;
112 if (flags & BTRFS_INODE_IMMUTABLE)
113 iflags |= FS_IMMUTABLE_FL;
114 if (flags & BTRFS_INODE_APPEND)
115 iflags |= FS_APPEND_FL;
116 if (flags & BTRFS_INODE_NODUMP)
117 iflags |= FS_NODUMP_FL;
118 if (flags & BTRFS_INODE_NOATIME)
119 iflags |= FS_NOATIME_FL;
120 if (flags & BTRFS_INODE_DIRSYNC)
121 iflags |= FS_DIRSYNC_FL;
122 if (flags & BTRFS_INODE_NODATACOW)
123 iflags |= FS_NOCOW_FL;
124
125 if (flags & BTRFS_INODE_NOCOMPRESS)
126 iflags |= FS_NOCOMP_FL;
127 else if (flags & BTRFS_INODE_COMPRESS)
128 iflags |= FS_COMPR_FL;
129
130 return iflags;
131 }
132
133 /*
134 * Update inode->i_flags based on the btrfs internal flags.
135 */
136 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode)
137 {
138 struct btrfs_inode *binode = BTRFS_I(inode);
139 unsigned int new_fl = 0;
140
141 if (binode->flags & BTRFS_INODE_SYNC)
142 new_fl |= S_SYNC;
143 if (binode->flags & BTRFS_INODE_IMMUTABLE)
144 new_fl |= S_IMMUTABLE;
145 if (binode->flags & BTRFS_INODE_APPEND)
146 new_fl |= S_APPEND;
147 if (binode->flags & BTRFS_INODE_NOATIME)
148 new_fl |= S_NOATIME;
149 if (binode->flags & BTRFS_INODE_DIRSYNC)
150 new_fl |= S_DIRSYNC;
151
152 set_mask_bits(&inode->i_flags,
153 S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC,
154 new_fl);
155 }
156
157 static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
158 {
159 struct btrfs_inode *binode = BTRFS_I(file_inode(file));
160 unsigned int flags = btrfs_inode_flags_to_fsflags(binode->flags);
161
162 if (copy_to_user(arg, &flags, sizeof(flags)))
163 return -EFAULT;
164 return 0;
165 }
166
167 /* Check if @flags are a supported and valid set of FS_*_FL flags */
168 static int check_fsflags(unsigned int flags)
169 {
170 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
171 FS_NOATIME_FL | FS_NODUMP_FL | \
172 FS_SYNC_FL | FS_DIRSYNC_FL | \
173 FS_NOCOMP_FL | FS_COMPR_FL |
174 FS_NOCOW_FL))
175 return -EOPNOTSUPP;
176
177 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
178 return -EINVAL;
179
180 return 0;
181 }
182
183 static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
184 {
185 struct inode *inode = file_inode(file);
186 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
187 struct btrfs_inode *binode = BTRFS_I(inode);
188 struct btrfs_root *root = binode->root;
189 struct btrfs_trans_handle *trans;
190 unsigned int fsflags, old_fsflags;
191 int ret;
192 u64 old_flags;
193 unsigned int old_i_flags;
194 umode_t mode;
195
196 if (!inode_owner_or_capable(inode))
197 return -EPERM;
198
199 if (btrfs_root_readonly(root))
200 return -EROFS;
201
202 if (copy_from_user(&fsflags, arg, sizeof(fsflags)))
203 return -EFAULT;
204
205 ret = check_fsflags(fsflags);
206 if (ret)
207 return ret;
208
209 ret = mnt_want_write_file(file);
210 if (ret)
211 return ret;
212
213 inode_lock(inode);
214
215 old_flags = binode->flags;
216 old_i_flags = inode->i_flags;
217 mode = inode->i_mode;
218
219 fsflags = btrfs_mask_fsflags_for_type(inode, fsflags);
220 old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags);
221 if ((fsflags ^ old_fsflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
222 if (!capable(CAP_LINUX_IMMUTABLE)) {
223 ret = -EPERM;
224 goto out_unlock;
225 }
226 }
227
228 if (fsflags & FS_SYNC_FL)
229 binode->flags |= BTRFS_INODE_SYNC;
230 else
231 binode->flags &= ~BTRFS_INODE_SYNC;
232 if (fsflags & FS_IMMUTABLE_FL)
233 binode->flags |= BTRFS_INODE_IMMUTABLE;
234 else
235 binode->flags &= ~BTRFS_INODE_IMMUTABLE;
236 if (fsflags & FS_APPEND_FL)
237 binode->flags |= BTRFS_INODE_APPEND;
238 else
239 binode->flags &= ~BTRFS_INODE_APPEND;
240 if (fsflags & FS_NODUMP_FL)
241 binode->flags |= BTRFS_INODE_NODUMP;
242 else
243 binode->flags &= ~BTRFS_INODE_NODUMP;
244 if (fsflags & FS_NOATIME_FL)
245 binode->flags |= BTRFS_INODE_NOATIME;
246 else
247 binode->flags &= ~BTRFS_INODE_NOATIME;
248 if (fsflags & FS_DIRSYNC_FL)
249 binode->flags |= BTRFS_INODE_DIRSYNC;
250 else
251 binode->flags &= ~BTRFS_INODE_DIRSYNC;
252 if (fsflags & FS_NOCOW_FL) {
253 if (S_ISREG(mode)) {
254 /*
255 * It's safe to turn csums off here, no extents exist.
256 * Otherwise we want the flag to reflect the real COW
257 * status of the file and will not set it.
258 */
259 if (inode->i_size == 0)
260 binode->flags |= BTRFS_INODE_NODATACOW
261 | BTRFS_INODE_NODATASUM;
262 } else {
263 binode->flags |= BTRFS_INODE_NODATACOW;
264 }
265 } else {
266 /*
267 * Revert back under same assumptions as above
268 */
269 if (S_ISREG(mode)) {
270 if (inode->i_size == 0)
271 binode->flags &= ~(BTRFS_INODE_NODATACOW
272 | BTRFS_INODE_NODATASUM);
273 } else {
274 binode->flags &= ~BTRFS_INODE_NODATACOW;
275 }
276 }
277
278 /*
279 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
280 * flag may be changed automatically if compression code won't make
281 * things smaller.
282 */
283 if (fsflags & FS_NOCOMP_FL) {
284 binode->flags &= ~BTRFS_INODE_COMPRESS;
285 binode->flags |= BTRFS_INODE_NOCOMPRESS;
286
287 ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
288 if (ret && ret != -ENODATA)
289 goto out_drop;
290 } else if (fsflags & FS_COMPR_FL) {
291 const char *comp;
292
293 if (IS_SWAPFILE(inode)) {
294 ret = -ETXTBSY;
295 goto out_unlock;
296 }
297
298 binode->flags |= BTRFS_INODE_COMPRESS;
299 binode->flags &= ~BTRFS_INODE_NOCOMPRESS;
300
301 comp = btrfs_compress_type2str(fs_info->compress_type);
302 if (!comp || comp[0] == 0)
303 comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB);
304
305 ret = btrfs_set_prop(inode, "btrfs.compression",
306 comp, strlen(comp), 0);
307 if (ret)
308 goto out_drop;
309
310 } else {
311 ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
312 if (ret && ret != -ENODATA)
313 goto out_drop;
314 binode->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
315 }
316
317 trans = btrfs_start_transaction(root, 1);
318 if (IS_ERR(trans)) {
319 ret = PTR_ERR(trans);
320 goto out_drop;
321 }
322
323 btrfs_sync_inode_flags_to_i_flags(inode);
324 inode_inc_iversion(inode);
325 inode->i_ctime = current_time(inode);
326 ret = btrfs_update_inode(trans, root, inode);
327
328 btrfs_end_transaction(trans);
329 out_drop:
330 if (ret) {
331 binode->flags = old_flags;
332 inode->i_flags = old_i_flags;
333 }
334
335 out_unlock:
336 inode_unlock(inode);
337 mnt_drop_write_file(file);
338 return ret;
339 }
340
341 /*
342 * Translate btrfs internal inode flags to xflags as expected by the
343 * FS_IOC_FSGETXATT ioctl. Filter only the supported ones, unknown flags are
344 * silently dropped.
345 */
346 static unsigned int btrfs_inode_flags_to_xflags(unsigned int flags)
347 {
348 unsigned int xflags = 0;
349
350 if (flags & BTRFS_INODE_APPEND)
351 xflags |= FS_XFLAG_APPEND;
352 if (flags & BTRFS_INODE_IMMUTABLE)
353 xflags |= FS_XFLAG_IMMUTABLE;
354 if (flags & BTRFS_INODE_NOATIME)
355 xflags |= FS_XFLAG_NOATIME;
356 if (flags & BTRFS_INODE_NODUMP)
357 xflags |= FS_XFLAG_NODUMP;
358 if (flags & BTRFS_INODE_SYNC)
359 xflags |= FS_XFLAG_SYNC;
360
361 return xflags;
362 }
363
364 /* Check if @flags are a supported and valid set of FS_XFLAGS_* flags */
365 static int check_xflags(unsigned int flags)
366 {
367 if (flags & ~(FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE | FS_XFLAG_NOATIME |
368 FS_XFLAG_NODUMP | FS_XFLAG_SYNC))
369 return -EOPNOTSUPP;
370 return 0;
371 }
372
373 /*
374 * Set the xflags from the internal inode flags. The remaining items of fsxattr
375 * are zeroed.
376 */
377 static int btrfs_ioctl_fsgetxattr(struct file *file, void __user *arg)
378 {
379 struct btrfs_inode *binode = BTRFS_I(file_inode(file));
380 struct fsxattr fa;
381
382 memset(&fa, 0, sizeof(fa));
383 fa.fsx_xflags = btrfs_inode_flags_to_xflags(binode->flags);
384
385 if (copy_to_user(arg, &fa, sizeof(fa)))
386 return -EFAULT;
387
388 return 0;
389 }
390
391 static int btrfs_ioctl_fssetxattr(struct file *file, void __user *arg)
392 {
393 struct inode *inode = file_inode(file);
394 struct btrfs_inode *binode = BTRFS_I(inode);
395 struct btrfs_root *root = binode->root;
396 struct btrfs_trans_handle *trans;
397 struct fsxattr fa;
398 unsigned old_flags;
399 unsigned old_i_flags;
400 int ret = 0;
401
402 if (!inode_owner_or_capable(inode))
403 return -EPERM;
404
405 if (btrfs_root_readonly(root))
406 return -EROFS;
407
408 memset(&fa, 0, sizeof(fa));
409 if (copy_from_user(&fa, arg, sizeof(fa)))
410 return -EFAULT;
411
412 ret = check_xflags(fa.fsx_xflags);
413 if (ret)
414 return ret;
415
416 if (fa.fsx_extsize != 0 || fa.fsx_projid != 0 || fa.fsx_cowextsize != 0)
417 return -EOPNOTSUPP;
418
419 ret = mnt_want_write_file(file);
420 if (ret)
421 return ret;
422
423 inode_lock(inode);
424
425 old_flags = binode->flags;
426 old_i_flags = inode->i_flags;
427
428 /* We need the capabilities to change append-only or immutable inode */
429 if (((old_flags & (BTRFS_INODE_APPEND | BTRFS_INODE_IMMUTABLE)) ||
430 (fa.fsx_xflags & (FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE))) &&
431 !capable(CAP_LINUX_IMMUTABLE)) {
432 ret = -EPERM;
433 goto out_unlock;
434 }
435
436 if (fa.fsx_xflags & FS_XFLAG_SYNC)
437 binode->flags |= BTRFS_INODE_SYNC;
438 else
439 binode->flags &= ~BTRFS_INODE_SYNC;
440 if (fa.fsx_xflags & FS_XFLAG_IMMUTABLE)
441 binode->flags |= BTRFS_INODE_IMMUTABLE;
442 else
443 binode->flags &= ~BTRFS_INODE_IMMUTABLE;
444 if (fa.fsx_xflags & FS_XFLAG_APPEND)
445 binode->flags |= BTRFS_INODE_APPEND;
446 else
447 binode->flags &= ~BTRFS_INODE_APPEND;
448 if (fa.fsx_xflags & FS_XFLAG_NODUMP)
449 binode->flags |= BTRFS_INODE_NODUMP;
450 else
451 binode->flags &= ~BTRFS_INODE_NODUMP;
452 if (fa.fsx_xflags & FS_XFLAG_NOATIME)
453 binode->flags |= BTRFS_INODE_NOATIME;
454 else
455 binode->flags &= ~BTRFS_INODE_NOATIME;
456
457 /* 1 item for the inode */
458 trans = btrfs_start_transaction(root, 1);
459 if (IS_ERR(trans)) {
460 ret = PTR_ERR(trans);
461 goto out_unlock;
462 }
463
464 btrfs_sync_inode_flags_to_i_flags(inode);
465 inode_inc_iversion(inode);
466 inode->i_ctime = current_time(inode);
467 ret = btrfs_update_inode(trans, root, inode);
468
469 btrfs_end_transaction(trans);
470
471 out_unlock:
472 if (ret) {
473 binode->flags = old_flags;
474 inode->i_flags = old_i_flags;
475 }
476
477 inode_unlock(inode);
478 mnt_drop_write_file(file);
479
480 return ret;
481 }
482
483 static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
484 {
485 struct inode *inode = file_inode(file);
486
487 return put_user(inode->i_generation, arg);
488 }
489
490 static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
491 {
492 struct inode *inode = file_inode(file);
493 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
494 struct btrfs_device *device;
495 struct request_queue *q;
496 struct fstrim_range range;
497 u64 minlen = ULLONG_MAX;
498 u64 num_devices = 0;
499 int ret;
500
501 if (!capable(CAP_SYS_ADMIN))
502 return -EPERM;
503
504 /*
505 * If the fs is mounted with nologreplay, which requires it to be
506 * mounted in RO mode as well, we can not allow discard on free space
507 * inside block groups, because log trees refer to extents that are not
508 * pinned in a block group's free space cache (pinning the extents is
509 * precisely the first phase of replaying a log tree).
510 */
511 if (btrfs_test_opt(fs_info, NOLOGREPLAY))
512 return -EROFS;
513
514 rcu_read_lock();
515 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
516 dev_list) {
517 if (!device->bdev)
518 continue;
519 q = bdev_get_queue(device->bdev);
520 if (blk_queue_discard(q)) {
521 num_devices++;
522 minlen = min_t(u64, q->limits.discard_granularity,
523 minlen);
524 }
525 }
526 rcu_read_unlock();
527
528 if (!num_devices)
529 return -EOPNOTSUPP;
530 if (copy_from_user(&range, arg, sizeof(range)))
531 return -EFAULT;
532
533 /*
534 * NOTE: Don't truncate the range using super->total_bytes. Bytenr of
535 * block group is in the logical address space, which can be any
536 * sectorsize aligned bytenr in the range [0, U64_MAX].
537 */
538 if (range.len < fs_info->sb->s_blocksize)
539 return -EINVAL;
540
541 range.minlen = max(range.minlen, minlen);
542 ret = btrfs_trim_fs(fs_info, &range);
543 if (ret < 0)
544 return ret;
545
546 if (copy_to_user(arg, &range, sizeof(range)))
547 return -EFAULT;
548
549 return 0;
550 }
551
552 int btrfs_is_empty_uuid(u8 *uuid)
553 {
554 int i;
555
556 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
557 if (uuid[i])
558 return 0;
559 }
560 return 1;
561 }
562
563 static noinline int create_subvol(struct inode *dir,
564 struct dentry *dentry,
565 const char *name, int namelen,
566 u64 *async_transid,
567 struct btrfs_qgroup_inherit *inherit)
568 {
569 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
570 struct btrfs_trans_handle *trans;
571 struct btrfs_key key;
572 struct btrfs_root_item *root_item;
573 struct btrfs_inode_item *inode_item;
574 struct extent_buffer *leaf;
575 struct btrfs_root *root = BTRFS_I(dir)->root;
576 struct btrfs_root *new_root;
577 struct btrfs_block_rsv block_rsv;
578 struct timespec64 cur_time = current_time(dir);
579 struct inode *inode;
580 int ret;
581 int err;
582 u64 objectid;
583 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
584 u64 index = 0;
585 uuid_le new_uuid;
586
587 root_item = kzalloc(sizeof(*root_item), GFP_KERNEL);
588 if (!root_item)
589 return -ENOMEM;
590
591 ret = btrfs_find_free_objectid(fs_info->tree_root, &objectid);
592 if (ret)
593 goto fail_free;
594
595 /*
596 * Don't create subvolume whose level is not zero. Or qgroup will be
597 * screwed up since it assumes subvolume qgroup's level to be 0.
598 */
599 if (btrfs_qgroup_level(objectid)) {
600 ret = -ENOSPC;
601 goto fail_free;
602 }
603
604 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
605 /*
606 * The same as the snapshot creation, please see the comment
607 * of create_snapshot().
608 */
609 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false);
610 if (ret)
611 goto fail_free;
612
613 trans = btrfs_start_transaction(root, 0);
614 if (IS_ERR(trans)) {
615 ret = PTR_ERR(trans);
616 btrfs_subvolume_release_metadata(fs_info, &block_rsv);
617 goto fail_free;
618 }
619 trans->block_rsv = &block_rsv;
620 trans->bytes_reserved = block_rsv.size;
621
622 ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit);
623 if (ret)
624 goto fail;
625
626 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0);
627 if (IS_ERR(leaf)) {
628 ret = PTR_ERR(leaf);
629 goto fail;
630 }
631
632 btrfs_mark_buffer_dirty(leaf);
633
634 inode_item = &root_item->inode;
635 btrfs_set_stack_inode_generation(inode_item, 1);
636 btrfs_set_stack_inode_size(inode_item, 3);
637 btrfs_set_stack_inode_nlink(inode_item, 1);
638 btrfs_set_stack_inode_nbytes(inode_item,
639 fs_info->nodesize);
640 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
641
642 btrfs_set_root_flags(root_item, 0);
643 btrfs_set_root_limit(root_item, 0);
644 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
645
646 btrfs_set_root_bytenr(root_item, leaf->start);
647 btrfs_set_root_generation(root_item, trans->transid);
648 btrfs_set_root_level(root_item, 0);
649 btrfs_set_root_refs(root_item, 1);
650 btrfs_set_root_used(root_item, leaf->len);
651 btrfs_set_root_last_snapshot(root_item, 0);
652
653 btrfs_set_root_generation_v2(root_item,
654 btrfs_root_generation(root_item));
655 uuid_le_gen(&new_uuid);
656 memcpy(root_item->uuid, new_uuid.b, BTRFS_UUID_SIZE);
657 btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec);
658 btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec);
659 root_item->ctime = root_item->otime;
660 btrfs_set_root_ctransid(root_item, trans->transid);
661 btrfs_set_root_otransid(root_item, trans->transid);
662
663 btrfs_tree_unlock(leaf);
664 free_extent_buffer(leaf);
665 leaf = NULL;
666
667 btrfs_set_root_dirid(root_item, new_dirid);
668
669 key.objectid = objectid;
670 key.offset = 0;
671 key.type = BTRFS_ROOT_ITEM_KEY;
672 ret = btrfs_insert_root(trans, fs_info->tree_root, &key,
673 root_item);
674 if (ret)
675 goto fail;
676
677 key.offset = (u64)-1;
678 new_root = btrfs_read_fs_root_no_name(fs_info, &key);
679 if (IS_ERR(new_root)) {
680 ret = PTR_ERR(new_root);
681 btrfs_abort_transaction(trans, ret);
682 goto fail;
683 }
684
685 btrfs_record_root_in_trans(trans, new_root);
686
687 ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid);
688 if (ret) {
689 /* We potentially lose an unused inode item here */
690 btrfs_abort_transaction(trans, ret);
691 goto fail;
692 }
693
694 mutex_lock(&new_root->objectid_mutex);
695 new_root->highest_objectid = new_dirid;
696 mutex_unlock(&new_root->objectid_mutex);
697
698 /*
699 * insert the directory item
700 */
701 ret = btrfs_set_inode_index(BTRFS_I(dir), &index);
702 if (ret) {
703 btrfs_abort_transaction(trans, ret);
704 goto fail;
705 }
706
707 ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key,
708 BTRFS_FT_DIR, index);
709 if (ret) {
710 btrfs_abort_transaction(trans, ret);
711 goto fail;
712 }
713
714 btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2);
715 ret = btrfs_update_inode(trans, root, dir);
716 BUG_ON(ret);
717
718 ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid,
719 btrfs_ino(BTRFS_I(dir)), index, name, namelen);
720 BUG_ON(ret);
721
722 ret = btrfs_uuid_tree_add(trans, root_item->uuid,
723 BTRFS_UUID_KEY_SUBVOL, objectid);
724 if (ret)
725 btrfs_abort_transaction(trans, ret);
726
727 fail:
728 kfree(root_item);
729 trans->block_rsv = NULL;
730 trans->bytes_reserved = 0;
731 btrfs_subvolume_release_metadata(fs_info, &block_rsv);
732
733 if (async_transid) {
734 *async_transid = trans->transid;
735 err = btrfs_commit_transaction_async(trans, 1);
736 if (err)
737 err = btrfs_commit_transaction(trans);
738 } else {
739 err = btrfs_commit_transaction(trans);
740 }
741 if (err && !ret)
742 ret = err;
743
744 if (!ret) {
745 inode = btrfs_lookup_dentry(dir, dentry);
746 if (IS_ERR(inode))
747 return PTR_ERR(inode);
748 d_instantiate(dentry, inode);
749 }
750 return ret;
751
752 fail_free:
753 kfree(root_item);
754 return ret;
755 }
756
757 static int create_snapshot(struct btrfs_root *root, struct inode *dir,
758 struct dentry *dentry,
759 u64 *async_transid, bool readonly,
760 struct btrfs_qgroup_inherit *inherit)
761 {
762 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
763 struct inode *inode;
764 struct btrfs_pending_snapshot *pending_snapshot;
765 struct btrfs_trans_handle *trans;
766 int ret;
767 bool snapshot_force_cow = false;
768
769 if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
770 return -EINVAL;
771
772 if (atomic_read(&root->nr_swapfiles)) {
773 btrfs_warn(fs_info,
774 "cannot snapshot subvolume with active swapfile");
775 return -ETXTBSY;
776 }
777
778 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL);
779 if (!pending_snapshot)
780 return -ENOMEM;
781
782 pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
783 GFP_KERNEL);
784 pending_snapshot->path = btrfs_alloc_path();
785 if (!pending_snapshot->root_item || !pending_snapshot->path) {
786 ret = -ENOMEM;
787 goto free_pending;
788 }
789
790 /*
791 * Force new buffered writes to reserve space even when NOCOW is
792 * possible. This is to avoid later writeback (running dealloc) to
793 * fallback to COW mode and unexpectedly fail with ENOSPC.
794 */
795 atomic_inc(&root->will_be_snapshotted);
796 smp_mb__after_atomic();
797 /* wait for no snapshot writes */
798 wait_event(root->subv_writers->wait,
799 percpu_counter_sum(&root->subv_writers->counter) == 0);
800
801 ret = btrfs_start_delalloc_snapshot(root);
802 if (ret)
803 goto dec_and_free;
804
805 /*
806 * All previous writes have started writeback in NOCOW mode, so now
807 * we force future writes to fallback to COW mode during snapshot
808 * creation.
809 */
810 atomic_inc(&root->snapshot_force_cow);
811 snapshot_force_cow = true;
812
813 btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1);
814
815 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
816 BTRFS_BLOCK_RSV_TEMP);
817 /*
818 * 1 - parent dir inode
819 * 2 - dir entries
820 * 1 - root item
821 * 2 - root ref/backref
822 * 1 - root of snapshot
823 * 1 - UUID item
824 */
825 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
826 &pending_snapshot->block_rsv, 8,
827 false);
828 if (ret)
829 goto dec_and_free;
830
831 pending_snapshot->dentry = dentry;
832 pending_snapshot->root = root;
833 pending_snapshot->readonly = readonly;
834 pending_snapshot->dir = dir;
835 pending_snapshot->inherit = inherit;
836
837 trans = btrfs_start_transaction(root, 0);
838 if (IS_ERR(trans)) {
839 ret = PTR_ERR(trans);
840 goto fail;
841 }
842
843 spin_lock(&fs_info->trans_lock);
844 list_add(&pending_snapshot->list,
845 &trans->transaction->pending_snapshots);
846 spin_unlock(&fs_info->trans_lock);
847 if (async_transid) {
848 *async_transid = trans->transid;
849 ret = btrfs_commit_transaction_async(trans, 1);
850 if (ret)
851 ret = btrfs_commit_transaction(trans);
852 } else {
853 ret = btrfs_commit_transaction(trans);
854 }
855 if (ret)
856 goto fail;
857
858 ret = pending_snapshot->error;
859 if (ret)
860 goto fail;
861
862 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
863 if (ret)
864 goto fail;
865
866 inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry);
867 if (IS_ERR(inode)) {
868 ret = PTR_ERR(inode);
869 goto fail;
870 }
871
872 d_instantiate(dentry, inode);
873 ret = 0;
874 fail:
875 btrfs_subvolume_release_metadata(fs_info, &pending_snapshot->block_rsv);
876 dec_and_free:
877 if (snapshot_force_cow)
878 atomic_dec(&root->snapshot_force_cow);
879 if (atomic_dec_and_test(&root->will_be_snapshotted))
880 wake_up_var(&root->will_be_snapshotted);
881 free_pending:
882 kfree(pending_snapshot->root_item);
883 btrfs_free_path(pending_snapshot->path);
884 kfree(pending_snapshot);
885
886 return ret;
887 }
888
889 /* copy of may_delete in fs/namei.c()
890 * Check whether we can remove a link victim from directory dir, check
891 * whether the type of victim is right.
892 * 1. We can't do it if dir is read-only (done in permission())
893 * 2. We should have write and exec permissions on dir
894 * 3. We can't remove anything from append-only dir
895 * 4. We can't do anything with immutable dir (done in permission())
896 * 5. If the sticky bit on dir is set we should either
897 * a. be owner of dir, or
898 * b. be owner of victim, or
899 * c. have CAP_FOWNER capability
900 * 6. If the victim is append-only or immutable we can't do anything with
901 * links pointing to it.
902 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
903 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
904 * 9. We can't remove a root or mountpoint.
905 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
906 * nfs_async_unlink().
907 */
908
909 static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
910 {
911 int error;
912
913 if (d_really_is_negative(victim))
914 return -ENOENT;
915
916 BUG_ON(d_inode(victim->d_parent) != dir);
917 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
918
919 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
920 if (error)
921 return error;
922 if (IS_APPEND(dir))
923 return -EPERM;
924 if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) ||
925 IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim)))
926 return -EPERM;
927 if (isdir) {
928 if (!d_is_dir(victim))
929 return -ENOTDIR;
930 if (IS_ROOT(victim))
931 return -EBUSY;
932 } else if (d_is_dir(victim))
933 return -EISDIR;
934 if (IS_DEADDIR(dir))
935 return -ENOENT;
936 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
937 return -EBUSY;
938 return 0;
939 }
940
941 /* copy of may_create in fs/namei.c() */
942 static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
943 {
944 if (d_really_is_positive(child))
945 return -EEXIST;
946 if (IS_DEADDIR(dir))
947 return -ENOENT;
948 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
949 }
950
951 /*
952 * Create a new subvolume below @parent. This is largely modeled after
953 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
954 * inside this filesystem so it's quite a bit simpler.
955 */
956 static noinline int btrfs_mksubvol(const struct path *parent,
957 const char *name, int namelen,
958 struct btrfs_root *snap_src,
959 u64 *async_transid, bool readonly,
960 struct btrfs_qgroup_inherit *inherit)
961 {
962 struct inode *dir = d_inode(parent->dentry);
963 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
964 struct dentry *dentry;
965 int error;
966
967 error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
968 if (error == -EINTR)
969 return error;
970
971 dentry = lookup_one_len(name, parent->dentry, namelen);
972 error = PTR_ERR(dentry);
973 if (IS_ERR(dentry))
974 goto out_unlock;
975
976 error = btrfs_may_create(dir, dentry);
977 if (error)
978 goto out_dput;
979
980 /*
981 * even if this name doesn't exist, we may get hash collisions.
982 * check for them now when we can safely fail
983 */
984 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
985 dir->i_ino, name,
986 namelen);
987 if (error)
988 goto out_dput;
989
990 down_read(&fs_info->subvol_sem);
991
992 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
993 goto out_up_read;
994
995 if (snap_src) {
996 error = create_snapshot(snap_src, dir, dentry,
997 async_transid, readonly, inherit);
998 } else {
999 error = create_subvol(dir, dentry, name, namelen,
1000 async_transid, inherit);
1001 }
1002 if (!error)
1003 fsnotify_mkdir(dir, dentry);
1004 out_up_read:
1005 up_read(&fs_info->subvol_sem);
1006 out_dput:
1007 dput(dentry);
1008 out_unlock:
1009 inode_unlock(dir);
1010 return error;
1011 }
1012
1013 /*
1014 * When we're defragging a range, we don't want to kick it off again
1015 * if it is really just waiting for delalloc to send it down.
1016 * If we find a nice big extent or delalloc range for the bytes in the
1017 * file you want to defrag, we return 0 to let you know to skip this
1018 * part of the file
1019 */
1020 static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh)
1021 {
1022 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1023 struct extent_map *em = NULL;
1024 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1025 u64 end;
1026
1027 read_lock(&em_tree->lock);
1028 em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE);
1029 read_unlock(&em_tree->lock);
1030
1031 if (em) {
1032 end = extent_map_end(em);
1033 free_extent_map(em);
1034 if (end - offset > thresh)
1035 return 0;
1036 }
1037 /* if we already have a nice delalloc here, just stop */
1038 thresh /= 2;
1039 end = count_range_bits(io_tree, &offset, offset + thresh,
1040 thresh, EXTENT_DELALLOC, 1);
1041 if (end >= thresh)
1042 return 0;
1043 return 1;
1044 }
1045
1046 /*
1047 * helper function to walk through a file and find extents
1048 * newer than a specific transid, and smaller than thresh.
1049 *
1050 * This is used by the defragging code to find new and small
1051 * extents
1052 */
1053 static int find_new_extents(struct btrfs_root *root,
1054 struct inode *inode, u64 newer_than,
1055 u64 *off, u32 thresh)
1056 {
1057 struct btrfs_path *path;
1058 struct btrfs_key min_key;
1059 struct extent_buffer *leaf;
1060 struct btrfs_file_extent_item *extent;
1061 int type;
1062 int ret;
1063 u64 ino = btrfs_ino(BTRFS_I(inode));
1064
1065 path = btrfs_alloc_path();
1066 if (!path)
1067 return -ENOMEM;
1068
1069 min_key.objectid = ino;
1070 min_key.type = BTRFS_EXTENT_DATA_KEY;
1071 min_key.offset = *off;
1072
1073 while (1) {
1074 ret = btrfs_search_forward(root, &min_key, path, newer_than);
1075 if (ret != 0)
1076 goto none;
1077 process_slot:
1078 if (min_key.objectid != ino)
1079 goto none;
1080 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
1081 goto none;
1082
1083 leaf = path->nodes[0];
1084 extent = btrfs_item_ptr(leaf, path->slots[0],
1085 struct btrfs_file_extent_item);
1086
1087 type = btrfs_file_extent_type(leaf, extent);
1088 if (type == BTRFS_FILE_EXTENT_REG &&
1089 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
1090 check_defrag_in_cache(inode, min_key.offset, thresh)) {
1091 *off = min_key.offset;
1092 btrfs_free_path(path);
1093 return 0;
1094 }
1095
1096 path->slots[0]++;
1097 if (path->slots[0] < btrfs_header_nritems(leaf)) {
1098 btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]);
1099 goto process_slot;
1100 }
1101
1102 if (min_key.offset == (u64)-1)
1103 goto none;
1104
1105 min_key.offset++;
1106 btrfs_release_path(path);
1107 }
1108 none:
1109 btrfs_free_path(path);
1110 return -ENOENT;
1111 }
1112
1113 static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
1114 {
1115 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1116 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1117 struct extent_map *em;
1118 u64 len = PAGE_SIZE;
1119
1120 /*
1121 * hopefully we have this extent in the tree already, try without
1122 * the full extent lock
1123 */
1124 read_lock(&em_tree->lock);
1125 em = lookup_extent_mapping(em_tree, start, len);
1126 read_unlock(&em_tree->lock);
1127
1128 if (!em) {
1129 struct extent_state *cached = NULL;
1130 u64 end = start + len - 1;
1131
1132 /* get the big lock and read metadata off disk */
1133 lock_extent_bits(io_tree, start, end, &cached);
1134 em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len, 0);
1135 unlock_extent_cached(io_tree, start, end, &cached);
1136
1137 if (IS_ERR(em))
1138 return NULL;
1139 }
1140
1141 return em;
1142 }
1143
1144 static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
1145 {
1146 struct extent_map *next;
1147 bool ret = true;
1148
1149 /* this is the last extent */
1150 if (em->start + em->len >= i_size_read(inode))
1151 return false;
1152
1153 next = defrag_lookup_extent(inode, em->start + em->len);
1154 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
1155 ret = false;
1156 else if ((em->block_start + em->block_len == next->block_start) &&
1157 (em->block_len > SZ_128K && next->block_len > SZ_128K))
1158 ret = false;
1159
1160 free_extent_map(next);
1161 return ret;
1162 }
1163
1164 static int should_defrag_range(struct inode *inode, u64 start, u32 thresh,
1165 u64 *last_len, u64 *skip, u64 *defrag_end,
1166 int compress)
1167 {
1168 struct extent_map *em;
1169 int ret = 1;
1170 bool next_mergeable = true;
1171 bool prev_mergeable = true;
1172
1173 /*
1174 * make sure that once we start defragging an extent, we keep on
1175 * defragging it
1176 */
1177 if (start < *defrag_end)
1178 return 1;
1179
1180 *skip = 0;
1181
1182 em = defrag_lookup_extent(inode, start);
1183 if (!em)
1184 return 0;
1185
1186 /* this will cover holes, and inline extents */
1187 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
1188 ret = 0;
1189 goto out;
1190 }
1191
1192 if (!*defrag_end)
1193 prev_mergeable = false;
1194
1195 next_mergeable = defrag_check_next_extent(inode, em);
1196 /*
1197 * we hit a real extent, if it is big or the next extent is not a
1198 * real extent, don't bother defragging it
1199 */
1200 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
1201 (em->len >= thresh || (!next_mergeable && !prev_mergeable)))
1202 ret = 0;
1203 out:
1204 /*
1205 * last_len ends up being a counter of how many bytes we've defragged.
1206 * every time we choose not to defrag an extent, we reset *last_len
1207 * so that the next tiny extent will force a defrag.
1208 *
1209 * The end result of this is that tiny extents before a single big
1210 * extent will force at least part of that big extent to be defragged.
1211 */
1212 if (ret) {
1213 *defrag_end = extent_map_end(em);
1214 } else {
1215 *last_len = 0;
1216 *skip = extent_map_end(em);
1217 *defrag_end = 0;
1218 }
1219
1220 free_extent_map(em);
1221 return ret;
1222 }
1223
1224 /*
1225 * it doesn't do much good to defrag one or two pages
1226 * at a time. This pulls in a nice chunk of pages
1227 * to COW and defrag.
1228 *
1229 * It also makes sure the delalloc code has enough
1230 * dirty data to avoid making new small extents as part
1231 * of the defrag
1232 *
1233 * It's a good idea to start RA on this range
1234 * before calling this.
1235 */
1236 static int cluster_pages_for_defrag(struct inode *inode,
1237 struct page **pages,
1238 unsigned long start_index,
1239 unsigned long num_pages)
1240 {
1241 unsigned long file_end;
1242 u64 isize = i_size_read(inode);
1243 u64 page_start;
1244 u64 page_end;
1245 u64 page_cnt;
1246 int ret;
1247 int i;
1248 int i_done;
1249 struct btrfs_ordered_extent *ordered;
1250 struct extent_state *cached_state = NULL;
1251 struct extent_io_tree *tree;
1252 struct extent_changeset *data_reserved = NULL;
1253 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
1254
1255 file_end = (isize - 1) >> PAGE_SHIFT;
1256 if (!isize || start_index > file_end)
1257 return 0;
1258
1259 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
1260
1261 ret = btrfs_delalloc_reserve_space(inode, &data_reserved,
1262 start_index << PAGE_SHIFT,
1263 page_cnt << PAGE_SHIFT);
1264 if (ret)
1265 return ret;
1266 i_done = 0;
1267 tree = &BTRFS_I(inode)->io_tree;
1268
1269 /* step one, lock all the pages */
1270 for (i = 0; i < page_cnt; i++) {
1271 struct page *page;
1272 again:
1273 page = find_or_create_page(inode->i_mapping,
1274 start_index + i, mask);
1275 if (!page)
1276 break;
1277
1278 page_start = page_offset(page);
1279 page_end = page_start + PAGE_SIZE - 1;
1280 while (1) {
1281 lock_extent_bits(tree, page_start, page_end,
1282 &cached_state);
1283 ordered = btrfs_lookup_ordered_extent(inode,
1284 page_start);
1285 unlock_extent_cached(tree, page_start, page_end,
1286 &cached_state);
1287 if (!ordered)
1288 break;
1289
1290 unlock_page(page);
1291 btrfs_start_ordered_extent(inode, ordered, 1);
1292 btrfs_put_ordered_extent(ordered);
1293 lock_page(page);
1294 /*
1295 * we unlocked the page above, so we need check if
1296 * it was released or not.
1297 */
1298 if (page->mapping != inode->i_mapping) {
1299 unlock_page(page);
1300 put_page(page);
1301 goto again;
1302 }
1303 }
1304
1305 if (!PageUptodate(page)) {
1306 btrfs_readpage(NULL, page);
1307 lock_page(page);
1308 if (!PageUptodate(page)) {
1309 unlock_page(page);
1310 put_page(page);
1311 ret = -EIO;
1312 break;
1313 }
1314 }
1315
1316 if (page->mapping != inode->i_mapping) {
1317 unlock_page(page);
1318 put_page(page);
1319 goto again;
1320 }
1321
1322 pages[i] = page;
1323 i_done++;
1324 }
1325 if (!i_done || ret)
1326 goto out;
1327
1328 if (!(inode->i_sb->s_flags & SB_ACTIVE))
1329 goto out;
1330
1331 /*
1332 * so now we have a nice long stream of locked
1333 * and up to date pages, lets wait on them
1334 */
1335 for (i = 0; i < i_done; i++)
1336 wait_on_page_writeback(pages[i]);
1337
1338 page_start = page_offset(pages[0]);
1339 page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE;
1340
1341 lock_extent_bits(&BTRFS_I(inode)->io_tree,
1342 page_start, page_end - 1, &cached_state);
1343 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1344 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
1345 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
1346 &cached_state);
1347
1348 if (i_done != page_cnt) {
1349 spin_lock(&BTRFS_I(inode)->lock);
1350 btrfs_mod_outstanding_extents(BTRFS_I(inode), 1);
1351 spin_unlock(&BTRFS_I(inode)->lock);
1352 btrfs_delalloc_release_space(inode, data_reserved,
1353 start_index << PAGE_SHIFT,
1354 (page_cnt - i_done) << PAGE_SHIFT, true);
1355 }
1356
1357
1358 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1359 &cached_state);
1360
1361 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1362 page_start, page_end - 1, &cached_state);
1363
1364 for (i = 0; i < i_done; i++) {
1365 clear_page_dirty_for_io(pages[i]);
1366 ClearPageChecked(pages[i]);
1367 set_page_extent_mapped(pages[i]);
1368 set_page_dirty(pages[i]);
1369 unlock_page(pages[i]);
1370 put_page(pages[i]);
1371 }
1372 btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT,
1373 false);
1374 extent_changeset_free(data_reserved);
1375 return i_done;
1376 out:
1377 for (i = 0; i < i_done; i++) {
1378 unlock_page(pages[i]);
1379 put_page(pages[i]);
1380 }
1381 btrfs_delalloc_release_space(inode, data_reserved,
1382 start_index << PAGE_SHIFT,
1383 page_cnt << PAGE_SHIFT, true);
1384 btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT,
1385 true);
1386 extent_changeset_free(data_reserved);
1387 return ret;
1388
1389 }
1390
1391 int btrfs_defrag_file(struct inode *inode, struct file *file,
1392 struct btrfs_ioctl_defrag_range_args *range,
1393 u64 newer_than, unsigned long max_to_defrag)
1394 {
1395 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1396 struct btrfs_root *root = BTRFS_I(inode)->root;
1397 struct file_ra_state *ra = NULL;
1398 unsigned long last_index;
1399 u64 isize = i_size_read(inode);
1400 u64 last_len = 0;
1401 u64 skip = 0;
1402 u64 defrag_end = 0;
1403 u64 newer_off = range->start;
1404 unsigned long i;
1405 unsigned long ra_index = 0;
1406 int ret;
1407 int defrag_count = 0;
1408 int compress_type = BTRFS_COMPRESS_ZLIB;
1409 u32 extent_thresh = range->extent_thresh;
1410 unsigned long max_cluster = SZ_256K >> PAGE_SHIFT;
1411 unsigned long cluster = max_cluster;
1412 u64 new_align = ~((u64)SZ_128K - 1);
1413 struct page **pages = NULL;
1414 bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS;
1415
1416 if (isize == 0)
1417 return 0;
1418
1419 if (range->start >= isize)
1420 return -EINVAL;
1421
1422 if (do_compress) {
1423 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1424 return -EINVAL;
1425 if (range->compress_type)
1426 compress_type = range->compress_type;
1427 }
1428
1429 if (extent_thresh == 0)
1430 extent_thresh = SZ_256K;
1431
1432 /*
1433 * If we were not given a file, allocate a readahead context. As
1434 * readahead is just an optimization, defrag will work without it so
1435 * we don't error out.
1436 */
1437 if (!file) {
1438 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
1439 if (ra)
1440 file_ra_state_init(ra, inode->i_mapping);
1441 } else {
1442 ra = &file->f_ra;
1443 }
1444
1445 pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL);
1446 if (!pages) {
1447 ret = -ENOMEM;
1448 goto out_ra;
1449 }
1450
1451 /* find the last page to defrag */
1452 if (range->start + range->len > range->start) {
1453 last_index = min_t(u64, isize - 1,
1454 range->start + range->len - 1) >> PAGE_SHIFT;
1455 } else {
1456 last_index = (isize - 1) >> PAGE_SHIFT;
1457 }
1458
1459 if (newer_than) {
1460 ret = find_new_extents(root, inode, newer_than,
1461 &newer_off, SZ_64K);
1462 if (!ret) {
1463 range->start = newer_off;
1464 /*
1465 * we always align our defrag to help keep
1466 * the extents in the file evenly spaced
1467 */
1468 i = (newer_off & new_align) >> PAGE_SHIFT;
1469 } else
1470 goto out_ra;
1471 } else {
1472 i = range->start >> PAGE_SHIFT;
1473 }
1474 if (!max_to_defrag)
1475 max_to_defrag = last_index - i + 1;
1476
1477 /*
1478 * make writeback starts from i, so the defrag range can be
1479 * written sequentially.
1480 */
1481 if (i < inode->i_mapping->writeback_index)
1482 inode->i_mapping->writeback_index = i;
1483
1484 while (i <= last_index && defrag_count < max_to_defrag &&
1485 (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) {
1486 /*
1487 * make sure we stop running if someone unmounts
1488 * the FS
1489 */
1490 if (!(inode->i_sb->s_flags & SB_ACTIVE))
1491 break;
1492
1493 if (btrfs_defrag_cancelled(fs_info)) {
1494 btrfs_debug(fs_info, "defrag_file cancelled");
1495 ret = -EAGAIN;
1496 break;
1497 }
1498
1499 if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT,
1500 extent_thresh, &last_len, &skip,
1501 &defrag_end, do_compress)){
1502 unsigned long next;
1503 /*
1504 * the should_defrag function tells us how much to skip
1505 * bump our counter by the suggested amount
1506 */
1507 next = DIV_ROUND_UP(skip, PAGE_SIZE);
1508 i = max(i + 1, next);
1509 continue;
1510 }
1511
1512 if (!newer_than) {
1513 cluster = (PAGE_ALIGN(defrag_end) >>
1514 PAGE_SHIFT) - i;
1515 cluster = min(cluster, max_cluster);
1516 } else {
1517 cluster = max_cluster;
1518 }
1519
1520 if (i + cluster > ra_index) {
1521 ra_index = max(i, ra_index);
1522 if (ra)
1523 page_cache_sync_readahead(inode->i_mapping, ra,
1524 file, ra_index, cluster);
1525 ra_index += cluster;
1526 }
1527
1528 inode_lock(inode);
1529 if (IS_SWAPFILE(inode)) {
1530 ret = -ETXTBSY;
1531 } else {
1532 if (do_compress)
1533 BTRFS_I(inode)->defrag_compress = compress_type;
1534 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1535 }
1536 if (ret < 0) {
1537 inode_unlock(inode);
1538 goto out_ra;
1539 }
1540
1541 defrag_count += ret;
1542 balance_dirty_pages_ratelimited(inode->i_mapping);
1543 inode_unlock(inode);
1544
1545 if (newer_than) {
1546 if (newer_off == (u64)-1)
1547 break;
1548
1549 if (ret > 0)
1550 i += ret;
1551
1552 newer_off = max(newer_off + 1,
1553 (u64)i << PAGE_SHIFT);
1554
1555 ret = find_new_extents(root, inode, newer_than,
1556 &newer_off, SZ_64K);
1557 if (!ret) {
1558 range->start = newer_off;
1559 i = (newer_off & new_align) >> PAGE_SHIFT;
1560 } else {
1561 break;
1562 }
1563 } else {
1564 if (ret > 0) {
1565 i += ret;
1566 last_len += ret << PAGE_SHIFT;
1567 } else {
1568 i++;
1569 last_len = 0;
1570 }
1571 }
1572 }
1573
1574 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) {
1575 filemap_flush(inode->i_mapping);
1576 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1577 &BTRFS_I(inode)->runtime_flags))
1578 filemap_flush(inode->i_mapping);
1579 }
1580
1581 if (range->compress_type == BTRFS_COMPRESS_LZO) {
1582 btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
1583 } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) {
1584 btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
1585 }
1586
1587 ret = defrag_count;
1588
1589 out_ra:
1590 if (do_compress) {
1591 inode_lock(inode);
1592 BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE;
1593 inode_unlock(inode);
1594 }
1595 if (!file)
1596 kfree(ra);
1597 kfree(pages);
1598 return ret;
1599 }
1600
1601 static noinline int btrfs_ioctl_resize(struct file *file,
1602 void __user *arg)
1603 {
1604 struct inode *inode = file_inode(file);
1605 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1606 u64 new_size;
1607 u64 old_size;
1608 u64 devid = 1;
1609 struct btrfs_root *root = BTRFS_I(inode)->root;
1610 struct btrfs_ioctl_vol_args *vol_args;
1611 struct btrfs_trans_handle *trans;
1612 struct btrfs_device *device = NULL;
1613 char *sizestr;
1614 char *retptr;
1615 char *devstr = NULL;
1616 int ret = 0;
1617 int mod = 0;
1618
1619 if (!capable(CAP_SYS_ADMIN))
1620 return -EPERM;
1621
1622 ret = mnt_want_write_file(file);
1623 if (ret)
1624 return ret;
1625
1626 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
1627 mnt_drop_write_file(file);
1628 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
1629 }
1630
1631 vol_args = memdup_user(arg, sizeof(*vol_args));
1632 if (IS_ERR(vol_args)) {
1633 ret = PTR_ERR(vol_args);
1634 goto out;
1635 }
1636
1637 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1638
1639 sizestr = vol_args->name;
1640 devstr = strchr(sizestr, ':');
1641 if (devstr) {
1642 sizestr = devstr + 1;
1643 *devstr = '\0';
1644 devstr = vol_args->name;
1645 ret = kstrtoull(devstr, 10, &devid);
1646 if (ret)
1647 goto out_free;
1648 if (!devid) {
1649 ret = -EINVAL;
1650 goto out_free;
1651 }
1652 btrfs_info(fs_info, "resizing devid %llu", devid);
1653 }
1654
1655 device = btrfs_find_device(fs_info, devid, NULL, NULL);
1656 if (!device) {
1657 btrfs_info(fs_info, "resizer unable to find device %llu",
1658 devid);
1659 ret = -ENODEV;
1660 goto out_free;
1661 }
1662
1663 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) {
1664 btrfs_info(fs_info,
1665 "resizer unable to apply on readonly device %llu",
1666 devid);
1667 ret = -EPERM;
1668 goto out_free;
1669 }
1670
1671 if (!strcmp(sizestr, "max"))
1672 new_size = device->bdev->bd_inode->i_size;
1673 else {
1674 if (sizestr[0] == '-') {
1675 mod = -1;
1676 sizestr++;
1677 } else if (sizestr[0] == '+') {
1678 mod = 1;
1679 sizestr++;
1680 }
1681 new_size = memparse(sizestr, &retptr);
1682 if (*retptr != '\0' || new_size == 0) {
1683 ret = -EINVAL;
1684 goto out_free;
1685 }
1686 }
1687
1688 if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) {
1689 ret = -EPERM;
1690 goto out_free;
1691 }
1692
1693 old_size = btrfs_device_get_total_bytes(device);
1694
1695 if (mod < 0) {
1696 if (new_size > old_size) {
1697 ret = -EINVAL;
1698 goto out_free;
1699 }
1700 new_size = old_size - new_size;
1701 } else if (mod > 0) {
1702 if (new_size > ULLONG_MAX - old_size) {
1703 ret = -ERANGE;
1704 goto out_free;
1705 }
1706 new_size = old_size + new_size;
1707 }
1708
1709 if (new_size < SZ_256M) {
1710 ret = -EINVAL;
1711 goto out_free;
1712 }
1713 if (new_size > device->bdev->bd_inode->i_size) {
1714 ret = -EFBIG;
1715 goto out_free;
1716 }
1717
1718 new_size = round_down(new_size, fs_info->sectorsize);
1719
1720 btrfs_info_in_rcu(fs_info, "new size for %s is %llu",
1721 rcu_str_deref(device->name), new_size);
1722
1723 if (new_size > old_size) {
1724 trans = btrfs_start_transaction(root, 0);
1725 if (IS_ERR(trans)) {
1726 ret = PTR_ERR(trans);
1727 goto out_free;
1728 }
1729 ret = btrfs_grow_device(trans, device, new_size);
1730 btrfs_commit_transaction(trans);
1731 } else if (new_size < old_size) {
1732 ret = btrfs_shrink_device(device, new_size);
1733 } /* equal, nothing need to do */
1734
1735 out_free:
1736 kfree(vol_args);
1737 out:
1738 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
1739 mnt_drop_write_file(file);
1740 return ret;
1741 }
1742
1743 static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
1744 const char *name, unsigned long fd, int subvol,
1745 u64 *transid, bool readonly,
1746 struct btrfs_qgroup_inherit *inherit)
1747 {
1748 int namelen;
1749 int ret = 0;
1750
1751 if (!S_ISDIR(file_inode(file)->i_mode))
1752 return -ENOTDIR;
1753
1754 ret = mnt_want_write_file(file);
1755 if (ret)
1756 goto out;
1757
1758 namelen = strlen(name);
1759 if (strchr(name, '/')) {
1760 ret = -EINVAL;
1761 goto out_drop_write;
1762 }
1763
1764 if (name[0] == '.' &&
1765 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1766 ret = -EEXIST;
1767 goto out_drop_write;
1768 }
1769
1770 if (subvol) {
1771 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1772 NULL, transid, readonly, inherit);
1773 } else {
1774 struct fd src = fdget(fd);
1775 struct inode *src_inode;
1776 if (!src.file) {
1777 ret = -EINVAL;
1778 goto out_drop_write;
1779 }
1780
1781 src_inode = file_inode(src.file);
1782 if (src_inode->i_sb != file_inode(file)->i_sb) {
1783 btrfs_info(BTRFS_I(file_inode(file))->root->fs_info,
1784 "Snapshot src from another FS");
1785 ret = -EXDEV;
1786 } else if (!inode_owner_or_capable(src_inode)) {
1787 /*
1788 * Subvolume creation is not restricted, but snapshots
1789 * are limited to own subvolumes only
1790 */
1791 ret = -EPERM;
1792 } else {
1793 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1794 BTRFS_I(src_inode)->root,
1795 transid, readonly, inherit);
1796 }
1797 fdput(src);
1798 }
1799 out_drop_write:
1800 mnt_drop_write_file(file);
1801 out:
1802 return ret;
1803 }
1804
1805 static noinline int btrfs_ioctl_snap_create(struct file *file,
1806 void __user *arg, int subvol)
1807 {
1808 struct btrfs_ioctl_vol_args *vol_args;
1809 int ret;
1810
1811 if (!S_ISDIR(file_inode(file)->i_mode))
1812 return -ENOTDIR;
1813
1814 vol_args = memdup_user(arg, sizeof(*vol_args));
1815 if (IS_ERR(vol_args))
1816 return PTR_ERR(vol_args);
1817 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1818
1819 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1820 vol_args->fd, subvol,
1821 NULL, false, NULL);
1822
1823 kfree(vol_args);
1824 return ret;
1825 }
1826
1827 static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1828 void __user *arg, int subvol)
1829 {
1830 struct btrfs_ioctl_vol_args_v2 *vol_args;
1831 int ret;
1832 u64 transid = 0;
1833 u64 *ptr = NULL;
1834 bool readonly = false;
1835 struct btrfs_qgroup_inherit *inherit = NULL;
1836
1837 if (!S_ISDIR(file_inode(file)->i_mode))
1838 return -ENOTDIR;
1839
1840 vol_args = memdup_user(arg, sizeof(*vol_args));
1841 if (IS_ERR(vol_args))
1842 return PTR_ERR(vol_args);
1843 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
1844
1845 if (vol_args->flags &
1846 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1847 BTRFS_SUBVOL_QGROUP_INHERIT)) {
1848 ret = -EOPNOTSUPP;
1849 goto free_args;
1850 }
1851
1852 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1853 ptr = &transid;
1854 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1855 readonly = true;
1856 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1857 if (vol_args->size > PAGE_SIZE) {
1858 ret = -EINVAL;
1859 goto free_args;
1860 }
1861 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1862 if (IS_ERR(inherit)) {
1863 ret = PTR_ERR(inherit);
1864 goto free_args;
1865 }
1866 }
1867
1868 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1869 vol_args->fd, subvol, ptr,
1870 readonly, inherit);
1871 if (ret)
1872 goto free_inherit;
1873
1874 if (ptr && copy_to_user(arg +
1875 offsetof(struct btrfs_ioctl_vol_args_v2,
1876 transid),
1877 ptr, sizeof(*ptr)))
1878 ret = -EFAULT;
1879
1880 free_inherit:
1881 kfree(inherit);
1882 free_args:
1883 kfree(vol_args);
1884 return ret;
1885 }
1886
1887 static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1888 void __user *arg)
1889 {
1890 struct inode *inode = file_inode(file);
1891 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1892 struct btrfs_root *root = BTRFS_I(inode)->root;
1893 int ret = 0;
1894 u64 flags = 0;
1895
1896 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID)
1897 return -EINVAL;
1898
1899 down_read(&fs_info->subvol_sem);
1900 if (btrfs_root_readonly(root))
1901 flags |= BTRFS_SUBVOL_RDONLY;
1902 up_read(&fs_info->subvol_sem);
1903
1904 if (copy_to_user(arg, &flags, sizeof(flags)))
1905 ret = -EFAULT;
1906
1907 return ret;
1908 }
1909
1910 static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1911 void __user *arg)
1912 {
1913 struct inode *inode = file_inode(file);
1914 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1915 struct btrfs_root *root = BTRFS_I(inode)->root;
1916 struct btrfs_trans_handle *trans;
1917 u64 root_flags;
1918 u64 flags;
1919 int ret = 0;
1920
1921 if (!inode_owner_or_capable(inode))
1922 return -EPERM;
1923
1924 ret = mnt_want_write_file(file);
1925 if (ret)
1926 goto out;
1927
1928 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
1929 ret = -EINVAL;
1930 goto out_drop_write;
1931 }
1932
1933 if (copy_from_user(&flags, arg, sizeof(flags))) {
1934 ret = -EFAULT;
1935 goto out_drop_write;
1936 }
1937
1938 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1939 ret = -EINVAL;
1940 goto out_drop_write;
1941 }
1942
1943 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1944 ret = -EOPNOTSUPP;
1945 goto out_drop_write;
1946 }
1947
1948 down_write(&fs_info->subvol_sem);
1949
1950 /* nothing to do */
1951 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1952 goto out_drop_sem;
1953
1954 root_flags = btrfs_root_flags(&root->root_item);
1955 if (flags & BTRFS_SUBVOL_RDONLY) {
1956 btrfs_set_root_flags(&root->root_item,
1957 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1958 } else {
1959 /*
1960 * Block RO -> RW transition if this subvolume is involved in
1961 * send
1962 */
1963 spin_lock(&root->root_item_lock);
1964 if (root->send_in_progress == 0) {
1965 btrfs_set_root_flags(&root->root_item,
1966 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1967 spin_unlock(&root->root_item_lock);
1968 } else {
1969 spin_unlock(&root->root_item_lock);
1970 btrfs_warn(fs_info,
1971 "Attempt to set subvolume %llu read-write during send",
1972 root->root_key.objectid);
1973 ret = -EPERM;
1974 goto out_drop_sem;
1975 }
1976 }
1977
1978 trans = btrfs_start_transaction(root, 1);
1979 if (IS_ERR(trans)) {
1980 ret = PTR_ERR(trans);
1981 goto out_reset;
1982 }
1983
1984 ret = btrfs_update_root(trans, fs_info->tree_root,
1985 &root->root_key, &root->root_item);
1986 if (ret < 0) {
1987 btrfs_end_transaction(trans);
1988 goto out_reset;
1989 }
1990
1991 ret = btrfs_commit_transaction(trans);
1992
1993 out_reset:
1994 if (ret)
1995 btrfs_set_root_flags(&root->root_item, root_flags);
1996 out_drop_sem:
1997 up_write(&fs_info->subvol_sem);
1998 out_drop_write:
1999 mnt_drop_write_file(file);
2000 out:
2001 return ret;
2002 }
2003
2004 static noinline int key_in_sk(struct btrfs_key *key,
2005 struct btrfs_ioctl_search_key *sk)
2006 {
2007 struct btrfs_key test;
2008 int ret;
2009
2010 test.objectid = sk->min_objectid;
2011 test.type = sk->min_type;
2012 test.offset = sk->min_offset;
2013
2014 ret = btrfs_comp_cpu_keys(key, &test);
2015 if (ret < 0)
2016 return 0;
2017
2018 test.objectid = sk->max_objectid;
2019 test.type = sk->max_type;
2020 test.offset = sk->max_offset;
2021
2022 ret = btrfs_comp_cpu_keys(key, &test);
2023 if (ret > 0)
2024 return 0;
2025 return 1;
2026 }
2027
2028 static noinline int copy_to_sk(struct btrfs_path *path,
2029 struct btrfs_key *key,
2030 struct btrfs_ioctl_search_key *sk,
2031 size_t *buf_size,
2032 char __user *ubuf,
2033 unsigned long *sk_offset,
2034 int *num_found)
2035 {
2036 u64 found_transid;
2037 struct extent_buffer *leaf;
2038 struct btrfs_ioctl_search_header sh;
2039 struct btrfs_key test;
2040 unsigned long item_off;
2041 unsigned long item_len;
2042 int nritems;
2043 int i;
2044 int slot;
2045 int ret = 0;
2046
2047 leaf = path->nodes[0];
2048 slot = path->slots[0];
2049 nritems = btrfs_header_nritems(leaf);
2050
2051 if (btrfs_header_generation(leaf) > sk->max_transid) {
2052 i = nritems;
2053 goto advance_key;
2054 }
2055 found_transid = btrfs_header_generation(leaf);
2056
2057 for (i = slot; i < nritems; i++) {
2058 item_off = btrfs_item_ptr_offset(leaf, i);
2059 item_len = btrfs_item_size_nr(leaf, i);
2060
2061 btrfs_item_key_to_cpu(leaf, key, i);
2062 if (!key_in_sk(key, sk))
2063 continue;
2064
2065 if (sizeof(sh) + item_len > *buf_size) {
2066 if (*num_found) {
2067 ret = 1;
2068 goto out;
2069 }
2070
2071 /*
2072 * return one empty item back for v1, which does not
2073 * handle -EOVERFLOW
2074 */
2075
2076 *buf_size = sizeof(sh) + item_len;
2077 item_len = 0;
2078 ret = -EOVERFLOW;
2079 }
2080
2081 if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
2082 ret = 1;
2083 goto out;
2084 }
2085
2086 sh.objectid = key->objectid;
2087 sh.offset = key->offset;
2088 sh.type = key->type;
2089 sh.len = item_len;
2090 sh.transid = found_transid;
2091
2092 /* copy search result header */
2093 if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) {
2094 ret = -EFAULT;
2095 goto out;
2096 }
2097
2098 *sk_offset += sizeof(sh);
2099
2100 if (item_len) {
2101 char __user *up = ubuf + *sk_offset;
2102 /* copy the item */
2103 if (read_extent_buffer_to_user(leaf, up,
2104 item_off, item_len)) {
2105 ret = -EFAULT;
2106 goto out;
2107 }
2108
2109 *sk_offset += item_len;
2110 }
2111 (*num_found)++;
2112
2113 if (ret) /* -EOVERFLOW from above */
2114 goto out;
2115
2116 if (*num_found >= sk->nr_items) {
2117 ret = 1;
2118 goto out;
2119 }
2120 }
2121 advance_key:
2122 ret = 0;
2123 test.objectid = sk->max_objectid;
2124 test.type = sk->max_type;
2125 test.offset = sk->max_offset;
2126 if (btrfs_comp_cpu_keys(key, &test) >= 0)
2127 ret = 1;
2128 else if (key->offset < (u64)-1)
2129 key->offset++;
2130 else if (key->type < (u8)-1) {
2131 key->offset = 0;
2132 key->type++;
2133 } else if (key->objectid < (u64)-1) {
2134 key->offset = 0;
2135 key->type = 0;
2136 key->objectid++;
2137 } else
2138 ret = 1;
2139 out:
2140 /*
2141 * 0: all items from this leaf copied, continue with next
2142 * 1: * more items can be copied, but unused buffer is too small
2143 * * all items were found
2144 * Either way, it will stops the loop which iterates to the next
2145 * leaf
2146 * -EOVERFLOW: item was to large for buffer
2147 * -EFAULT: could not copy extent buffer back to userspace
2148 */
2149 return ret;
2150 }
2151
2152 static noinline int search_ioctl(struct inode *inode,
2153 struct btrfs_ioctl_search_key *sk,
2154 size_t *buf_size,
2155 char __user *ubuf)
2156 {
2157 struct btrfs_fs_info *info = btrfs_sb(inode->i_sb);
2158 struct btrfs_root *root;
2159 struct btrfs_key key;
2160 struct btrfs_path *path;
2161 int ret;
2162 int num_found = 0;
2163 unsigned long sk_offset = 0;
2164
2165 if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
2166 *buf_size = sizeof(struct btrfs_ioctl_search_header);
2167 return -EOVERFLOW;
2168 }
2169
2170 path = btrfs_alloc_path();
2171 if (!path)
2172 return -ENOMEM;
2173
2174 if (sk->tree_id == 0) {
2175 /* search the root of the inode that was passed */
2176 root = BTRFS_I(inode)->root;
2177 } else {
2178 key.objectid = sk->tree_id;
2179 key.type = BTRFS_ROOT_ITEM_KEY;
2180 key.offset = (u64)-1;
2181 root = btrfs_read_fs_root_no_name(info, &key);
2182 if (IS_ERR(root)) {
2183 btrfs_free_path(path);
2184 return PTR_ERR(root);
2185 }
2186 }
2187
2188 key.objectid = sk->min_objectid;
2189 key.type = sk->min_type;
2190 key.offset = sk->min_offset;
2191
2192 while (1) {
2193 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
2194 if (ret != 0) {
2195 if (ret > 0)
2196 ret = 0;
2197 goto err;
2198 }
2199 ret = copy_to_sk(path, &key, sk, buf_size, ubuf,
2200 &sk_offset, &num_found);
2201 btrfs_release_path(path);
2202 if (ret)
2203 break;
2204
2205 }
2206 if (ret > 0)
2207 ret = 0;
2208 err:
2209 sk->nr_items = num_found;
2210 btrfs_free_path(path);
2211 return ret;
2212 }
2213
2214 static noinline int btrfs_ioctl_tree_search(struct file *file,
2215 void __user *argp)
2216 {
2217 struct btrfs_ioctl_search_args __user *uargs;
2218 struct btrfs_ioctl_search_key sk;
2219 struct inode *inode;
2220 int ret;
2221 size_t buf_size;
2222
2223 if (!capable(CAP_SYS_ADMIN))
2224 return -EPERM;
2225
2226 uargs = (struct btrfs_ioctl_search_args __user *)argp;
2227
2228 if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
2229 return -EFAULT;
2230
2231 buf_size = sizeof(uargs->buf);
2232
2233 inode = file_inode(file);
2234 ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
2235
2236 /*
2237 * In the origin implementation an overflow is handled by returning a
2238 * search header with a len of zero, so reset ret.
2239 */
2240 if (ret == -EOVERFLOW)
2241 ret = 0;
2242
2243 if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
2244 ret = -EFAULT;
2245 return ret;
2246 }
2247
2248 static noinline int btrfs_ioctl_tree_search_v2(struct file *file,
2249 void __user *argp)
2250 {
2251 struct btrfs_ioctl_search_args_v2 __user *uarg;
2252 struct btrfs_ioctl_search_args_v2 args;
2253 struct inode *inode;
2254 int ret;
2255 size_t buf_size;
2256 const size_t buf_limit = SZ_16M;
2257
2258 if (!capable(CAP_SYS_ADMIN))
2259 return -EPERM;
2260
2261 /* copy search header and buffer size */
2262 uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp;
2263 if (copy_from_user(&args, uarg, sizeof(args)))
2264 return -EFAULT;
2265
2266 buf_size = args.buf_size;
2267
2268 /* limit result size to 16MB */
2269 if (buf_size > buf_limit)
2270 buf_size = buf_limit;
2271
2272 inode = file_inode(file);
2273 ret = search_ioctl(inode, &args.key, &buf_size,
2274 (char __user *)(&uarg->buf[0]));
2275 if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
2276 ret = -EFAULT;
2277 else if (ret == -EOVERFLOW &&
2278 copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
2279 ret = -EFAULT;
2280
2281 return ret;
2282 }
2283
2284 /*
2285 * Search INODE_REFs to identify path name of 'dirid' directory
2286 * in a 'tree_id' tree. and sets path name to 'name'.
2287 */
2288 static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
2289 u64 tree_id, u64 dirid, char *name)
2290 {
2291 struct btrfs_root *root;
2292 struct btrfs_key key;
2293 char *ptr;
2294 int ret = -1;
2295 int slot;
2296 int len;
2297 int total_len = 0;
2298 struct btrfs_inode_ref *iref;
2299 struct extent_buffer *l;
2300 struct btrfs_path *path;
2301
2302 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
2303 name[0]='\0';
2304 return 0;
2305 }
2306
2307 path = btrfs_alloc_path();
2308 if (!path)
2309 return -ENOMEM;
2310
2311 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1];
2312
2313 key.objectid = tree_id;
2314 key.type = BTRFS_ROOT_ITEM_KEY;
2315 key.offset = (u64)-1;
2316 root = btrfs_read_fs_root_no_name(info, &key);
2317 if (IS_ERR(root)) {
2318 ret = PTR_ERR(root);
2319 goto out;
2320 }
2321
2322 key.objectid = dirid;
2323 key.type = BTRFS_INODE_REF_KEY;
2324 key.offset = (u64)-1;
2325
2326 while (1) {
2327 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2328 if (ret < 0)
2329 goto out;
2330 else if (ret > 0) {
2331 ret = btrfs_previous_item(root, path, dirid,
2332 BTRFS_INODE_REF_KEY);
2333 if (ret < 0)
2334 goto out;
2335 else if (ret > 0) {
2336 ret = -ENOENT;
2337 goto out;
2338 }
2339 }
2340
2341 l = path->nodes[0];
2342 slot = path->slots[0];
2343 btrfs_item_key_to_cpu(l, &key, slot);
2344
2345 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2346 len = btrfs_inode_ref_name_len(l, iref);
2347 ptr -= len + 1;
2348 total_len += len + 1;
2349 if (ptr < name) {
2350 ret = -ENAMETOOLONG;
2351 goto out;
2352 }
2353
2354 *(ptr + len) = '/';
2355 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
2356
2357 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2358 break;
2359
2360 btrfs_release_path(path);
2361 key.objectid = key.offset;
2362 key.offset = (u64)-1;
2363 dirid = key.objectid;
2364 }
2365 memmove(name, ptr, total_len);
2366 name[total_len] = '\0';
2367 ret = 0;
2368 out:
2369 btrfs_free_path(path);
2370 return ret;
2371 }
2372
2373 static int btrfs_search_path_in_tree_user(struct inode *inode,
2374 struct btrfs_ioctl_ino_lookup_user_args *args)
2375 {
2376 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
2377 struct super_block *sb = inode->i_sb;
2378 struct btrfs_key upper_limit = BTRFS_I(inode)->location;
2379 u64 treeid = BTRFS_I(inode)->root->root_key.objectid;
2380 u64 dirid = args->dirid;
2381 unsigned long item_off;
2382 unsigned long item_len;
2383 struct btrfs_inode_ref *iref;
2384 struct btrfs_root_ref *rref;
2385 struct btrfs_root *root;
2386 struct btrfs_path *path;
2387 struct btrfs_key key, key2;
2388 struct extent_buffer *leaf;
2389 struct inode *temp_inode;
2390 char *ptr;
2391 int slot;
2392 int len;
2393 int total_len = 0;
2394 int ret;
2395
2396 path = btrfs_alloc_path();
2397 if (!path)
2398 return -ENOMEM;
2399
2400 /*
2401 * If the bottom subvolume does not exist directly under upper_limit,
2402 * construct the path in from the bottom up.
2403 */
2404 if (dirid != upper_limit.objectid) {
2405 ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1];
2406
2407 key.objectid = treeid;
2408 key.type = BTRFS_ROOT_ITEM_KEY;
2409 key.offset = (u64)-1;
2410 root = btrfs_read_fs_root_no_name(fs_info, &key);
2411 if (IS_ERR(root)) {
2412 ret = PTR_ERR(root);
2413 goto out;
2414 }
2415
2416 key.objectid = dirid;
2417 key.type = BTRFS_INODE_REF_KEY;
2418 key.offset = (u64)-1;
2419 while (1) {
2420 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2421 if (ret < 0) {
2422 goto out;
2423 } else if (ret > 0) {
2424 ret = btrfs_previous_item(root, path, dirid,
2425 BTRFS_INODE_REF_KEY);
2426 if (ret < 0) {
2427 goto out;
2428 } else if (ret > 0) {
2429 ret = -ENOENT;
2430 goto out;
2431 }
2432 }
2433
2434 leaf = path->nodes[0];
2435 slot = path->slots[0];
2436 btrfs_item_key_to_cpu(leaf, &key, slot);
2437
2438 iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref);
2439 len = btrfs_inode_ref_name_len(leaf, iref);
2440 ptr -= len + 1;
2441 total_len += len + 1;
2442 if (ptr < args->path) {
2443 ret = -ENAMETOOLONG;
2444 goto out;
2445 }
2446
2447 *(ptr + len) = '/';
2448 read_extent_buffer(leaf, ptr,
2449 (unsigned long)(iref + 1), len);
2450
2451 /* Check the read+exec permission of this directory */
2452 ret = btrfs_previous_item(root, path, dirid,
2453 BTRFS_INODE_ITEM_KEY);
2454 if (ret < 0) {
2455 goto out;
2456 } else if (ret > 0) {
2457 ret = -ENOENT;
2458 goto out;
2459 }
2460
2461 leaf = path->nodes[0];
2462 slot = path->slots[0];
2463 btrfs_item_key_to_cpu(leaf, &key2, slot);
2464 if (key2.objectid != dirid) {
2465 ret = -ENOENT;
2466 goto out;
2467 }
2468
2469 temp_inode = btrfs_iget(sb, &key2, root, NULL);
2470 if (IS_ERR(temp_inode)) {
2471 ret = PTR_ERR(temp_inode);
2472 goto out;
2473 }
2474 ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC);
2475 iput(temp_inode);
2476 if (ret) {
2477 ret = -EACCES;
2478 goto out;
2479 }
2480
2481 if (key.offset == upper_limit.objectid)
2482 break;
2483 if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) {
2484 ret = -EACCES;
2485 goto out;
2486 }
2487
2488 btrfs_release_path(path);
2489 key.objectid = key.offset;
2490 key.offset = (u64)-1;
2491 dirid = key.objectid;
2492 }
2493
2494 memmove(args->path, ptr, total_len);
2495 args->path[total_len] = '\0';
2496 btrfs_release_path(path);
2497 }
2498
2499 /* Get the bottom subvolume's name from ROOT_REF */
2500 root = fs_info->tree_root;
2501 key.objectid = treeid;
2502 key.type = BTRFS_ROOT_REF_KEY;
2503 key.offset = args->treeid;
2504 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2505 if (ret < 0) {
2506 goto out;
2507 } else if (ret > 0) {
2508 ret = -ENOENT;
2509 goto out;
2510 }
2511
2512 leaf = path->nodes[0];
2513 slot = path->slots[0];
2514 btrfs_item_key_to_cpu(leaf, &key, slot);
2515
2516 item_off = btrfs_item_ptr_offset(leaf, slot);
2517 item_len = btrfs_item_size_nr(leaf, slot);
2518 /* Check if dirid in ROOT_REF corresponds to passed dirid */
2519 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2520 if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) {
2521 ret = -EINVAL;
2522 goto out;
2523 }
2524
2525 /* Copy subvolume's name */
2526 item_off += sizeof(struct btrfs_root_ref);
2527 item_len -= sizeof(struct btrfs_root_ref);
2528 read_extent_buffer(leaf, args->name, item_off, item_len);
2529 args->name[item_len] = 0;
2530
2531 out:
2532 btrfs_free_path(path);
2533 return ret;
2534 }
2535
2536 static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2537 void __user *argp)
2538 {
2539 struct btrfs_ioctl_ino_lookup_args *args;
2540 struct inode *inode;
2541 int ret = 0;
2542
2543 args = memdup_user(argp, sizeof(*args));
2544 if (IS_ERR(args))
2545 return PTR_ERR(args);
2546
2547 inode = file_inode(file);
2548
2549 /*
2550 * Unprivileged query to obtain the containing subvolume root id. The
2551 * path is reset so it's consistent with btrfs_search_path_in_tree.
2552 */
2553 if (args->treeid == 0)
2554 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2555
2556 if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) {
2557 args->name[0] = 0;
2558 goto out;
2559 }
2560
2561 if (!capable(CAP_SYS_ADMIN)) {
2562 ret = -EPERM;
2563 goto out;
2564 }
2565
2566 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2567 args->treeid, args->objectid,
2568 args->name);
2569
2570 out:
2571 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2572 ret = -EFAULT;
2573
2574 kfree(args);
2575 return ret;
2576 }
2577
2578 /*
2579 * Version of ino_lookup ioctl (unprivileged)
2580 *
2581 * The main differences from ino_lookup ioctl are:
2582 *
2583 * 1. Read + Exec permission will be checked using inode_permission() during
2584 * path construction. -EACCES will be returned in case of failure.
2585 * 2. Path construction will be stopped at the inode number which corresponds
2586 * to the fd with which this ioctl is called. If constructed path does not
2587 * exist under fd's inode, -EACCES will be returned.
2588 * 3. The name of bottom subvolume is also searched and filled.
2589 */
2590 static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp)
2591 {
2592 struct btrfs_ioctl_ino_lookup_user_args *args;
2593 struct inode *inode;
2594 int ret;
2595
2596 args = memdup_user(argp, sizeof(*args));
2597 if (IS_ERR(args))
2598 return PTR_ERR(args);
2599
2600 inode = file_inode(file);
2601
2602 if (args->dirid == BTRFS_FIRST_FREE_OBJECTID &&
2603 BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) {
2604 /*
2605 * The subvolume does not exist under fd with which this is
2606 * called
2607 */
2608 kfree(args);
2609 return -EACCES;
2610 }
2611
2612 ret = btrfs_search_path_in_tree_user(inode, args);
2613
2614 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2615 ret = -EFAULT;
2616
2617 kfree(args);
2618 return ret;
2619 }
2620
2621 /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */
2622 static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp)
2623 {
2624 struct btrfs_ioctl_get_subvol_info_args *subvol_info;
2625 struct btrfs_fs_info *fs_info;
2626 struct btrfs_root *root;
2627 struct btrfs_path *path;
2628 struct btrfs_key key;
2629 struct btrfs_root_item *root_item;
2630 struct btrfs_root_ref *rref;
2631 struct extent_buffer *leaf;
2632 unsigned long item_off;
2633 unsigned long item_len;
2634 struct inode *inode;
2635 int slot;
2636 int ret = 0;
2637
2638 path = btrfs_alloc_path();
2639 if (!path)
2640 return -ENOMEM;
2641
2642 subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL);
2643 if (!subvol_info) {
2644 btrfs_free_path(path);
2645 return -ENOMEM;
2646 }
2647
2648 inode = file_inode(file);
2649 fs_info = BTRFS_I(inode)->root->fs_info;
2650
2651 /* Get root_item of inode's subvolume */
2652 key.objectid = BTRFS_I(inode)->root->root_key.objectid;
2653 key.type = BTRFS_ROOT_ITEM_KEY;
2654 key.offset = (u64)-1;
2655 root = btrfs_read_fs_root_no_name(fs_info, &key);
2656 if (IS_ERR(root)) {
2657 ret = PTR_ERR(root);
2658 goto out;
2659 }
2660 root_item = &root->root_item;
2661
2662 subvol_info->treeid = key.objectid;
2663
2664 subvol_info->generation = btrfs_root_generation(root_item);
2665 subvol_info->flags = btrfs_root_flags(root_item);
2666
2667 memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE);
2668 memcpy(subvol_info->parent_uuid, root_item->parent_uuid,
2669 BTRFS_UUID_SIZE);
2670 memcpy(subvol_info->received_uuid, root_item->received_uuid,
2671 BTRFS_UUID_SIZE);
2672
2673 subvol_info->ctransid = btrfs_root_ctransid(root_item);
2674 subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime);
2675 subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime);
2676
2677 subvol_info->otransid = btrfs_root_otransid(root_item);
2678 subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime);
2679 subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime);
2680
2681 subvol_info->stransid = btrfs_root_stransid(root_item);
2682 subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime);
2683 subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime);
2684
2685 subvol_info->rtransid = btrfs_root_rtransid(root_item);
2686 subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime);
2687 subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime);
2688
2689 if (key.objectid != BTRFS_FS_TREE_OBJECTID) {
2690 /* Search root tree for ROOT_BACKREF of this subvolume */
2691 root = fs_info->tree_root;
2692
2693 key.type = BTRFS_ROOT_BACKREF_KEY;
2694 key.offset = 0;
2695 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2696 if (ret < 0) {
2697 goto out;
2698 } else if (path->slots[0] >=
2699 btrfs_header_nritems(path->nodes[0])) {
2700 ret = btrfs_next_leaf(root, path);
2701 if (ret < 0) {
2702 goto out;
2703 } else if (ret > 0) {
2704 ret = -EUCLEAN;
2705 goto out;
2706 }
2707 }
2708
2709 leaf = path->nodes[0];
2710 slot = path->slots[0];
2711 btrfs_item_key_to_cpu(leaf, &key, slot);
2712 if (key.objectid == subvol_info->treeid &&
2713 key.type == BTRFS_ROOT_BACKREF_KEY) {
2714 subvol_info->parent_id = key.offset;
2715
2716 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2717 subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref);
2718
2719 item_off = btrfs_item_ptr_offset(leaf, slot)
2720 + sizeof(struct btrfs_root_ref);
2721 item_len = btrfs_item_size_nr(leaf, slot)
2722 - sizeof(struct btrfs_root_ref);
2723 read_extent_buffer(leaf, subvol_info->name,
2724 item_off, item_len);
2725 } else {
2726 ret = -ENOENT;
2727 goto out;
2728 }
2729 }
2730
2731 if (copy_to_user(argp, subvol_info, sizeof(*subvol_info)))
2732 ret = -EFAULT;
2733
2734 out:
2735 btrfs_free_path(path);
2736 kzfree(subvol_info);
2737 return ret;
2738 }
2739
2740 /*
2741 * Return ROOT_REF information of the subvolume containing this inode
2742 * except the subvolume name.
2743 */
2744 static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp)
2745 {
2746 struct btrfs_ioctl_get_subvol_rootref_args *rootrefs;
2747 struct btrfs_root_ref *rref;
2748 struct btrfs_root *root;
2749 struct btrfs_path *path;
2750 struct btrfs_key key;
2751 struct extent_buffer *leaf;
2752 struct inode *inode;
2753 u64 objectid;
2754 int slot;
2755 int ret;
2756 u8 found;
2757
2758 path = btrfs_alloc_path();
2759 if (!path)
2760 return -ENOMEM;
2761
2762 rootrefs = memdup_user(argp, sizeof(*rootrefs));
2763 if (IS_ERR(rootrefs)) {
2764 btrfs_free_path(path);
2765 return PTR_ERR(rootrefs);
2766 }
2767
2768 inode = file_inode(file);
2769 root = BTRFS_I(inode)->root->fs_info->tree_root;
2770 objectid = BTRFS_I(inode)->root->root_key.objectid;
2771
2772 key.objectid = objectid;
2773 key.type = BTRFS_ROOT_REF_KEY;
2774 key.offset = rootrefs->min_treeid;
2775 found = 0;
2776
2777 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2778 if (ret < 0) {
2779 goto out;
2780 } else if (path->slots[0] >=
2781 btrfs_header_nritems(path->nodes[0])) {
2782 ret = btrfs_next_leaf(root, path);
2783 if (ret < 0) {
2784 goto out;
2785 } else if (ret > 0) {
2786 ret = -EUCLEAN;
2787 goto out;
2788 }
2789 }
2790 while (1) {
2791 leaf = path->nodes[0];
2792 slot = path->slots[0];
2793
2794 btrfs_item_key_to_cpu(leaf, &key, slot);
2795 if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) {
2796 ret = 0;
2797 goto out;
2798 }
2799
2800 if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) {
2801 ret = -EOVERFLOW;
2802 goto out;
2803 }
2804
2805 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2806 rootrefs->rootref[found].treeid = key.offset;
2807 rootrefs->rootref[found].dirid =
2808 btrfs_root_ref_dirid(leaf, rref);
2809 found++;
2810
2811 ret = btrfs_next_item(root, path);
2812 if (ret < 0) {
2813 goto out;
2814 } else if (ret > 0) {
2815 ret = -EUCLEAN;
2816 goto out;
2817 }
2818 }
2819
2820 out:
2821 if (!ret || ret == -EOVERFLOW) {
2822 rootrefs->num_items = found;
2823 /* update min_treeid for next search */
2824 if (found)
2825 rootrefs->min_treeid =
2826 rootrefs->rootref[found - 1].treeid + 1;
2827 if (copy_to_user(argp, rootrefs, sizeof(*rootrefs)))
2828 ret = -EFAULT;
2829 }
2830
2831 kfree(rootrefs);
2832 btrfs_free_path(path);
2833
2834 return ret;
2835 }
2836
2837 static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2838 void __user *arg)
2839 {
2840 struct dentry *parent = file->f_path.dentry;
2841 struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb);
2842 struct dentry *dentry;
2843 struct inode *dir = d_inode(parent);
2844 struct inode *inode;
2845 struct btrfs_root *root = BTRFS_I(dir)->root;
2846 struct btrfs_root *dest = NULL;
2847 struct btrfs_ioctl_vol_args *vol_args;
2848 int namelen;
2849 int err = 0;
2850
2851 if (!S_ISDIR(dir->i_mode))
2852 return -ENOTDIR;
2853
2854 vol_args = memdup_user(arg, sizeof(*vol_args));
2855 if (IS_ERR(vol_args))
2856 return PTR_ERR(vol_args);
2857
2858 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2859 namelen = strlen(vol_args->name);
2860 if (strchr(vol_args->name, '/') ||
2861 strncmp(vol_args->name, "..", namelen) == 0) {
2862 err = -EINVAL;
2863 goto out;
2864 }
2865
2866 err = mnt_want_write_file(file);
2867 if (err)
2868 goto out;
2869
2870
2871 err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
2872 if (err == -EINTR)
2873 goto out_drop_write;
2874 dentry = lookup_one_len(vol_args->name, parent, namelen);
2875 if (IS_ERR(dentry)) {
2876 err = PTR_ERR(dentry);
2877 goto out_unlock_dir;
2878 }
2879
2880 if (d_really_is_negative(dentry)) {
2881 err = -ENOENT;
2882 goto out_dput;
2883 }
2884
2885 inode = d_inode(dentry);
2886 dest = BTRFS_I(inode)->root;
2887 if (!capable(CAP_SYS_ADMIN)) {
2888 /*
2889 * Regular user. Only allow this with a special mount
2890 * option, when the user has write+exec access to the
2891 * subvol root, and when rmdir(2) would have been
2892 * allowed.
2893 *
2894 * Note that this is _not_ check that the subvol is
2895 * empty or doesn't contain data that we wouldn't
2896 * otherwise be able to delete.
2897 *
2898 * Users who want to delete empty subvols should try
2899 * rmdir(2).
2900 */
2901 err = -EPERM;
2902 if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED))
2903 goto out_dput;
2904
2905 /*
2906 * Do not allow deletion if the parent dir is the same
2907 * as the dir to be deleted. That means the ioctl
2908 * must be called on the dentry referencing the root
2909 * of the subvol, not a random directory contained
2910 * within it.
2911 */
2912 err = -EINVAL;
2913 if (root == dest)
2914 goto out_dput;
2915
2916 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2917 if (err)
2918 goto out_dput;
2919 }
2920
2921 /* check if subvolume may be deleted by a user */
2922 err = btrfs_may_delete(dir, dentry, 1);
2923 if (err)
2924 goto out_dput;
2925
2926 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
2927 err = -EINVAL;
2928 goto out_dput;
2929 }
2930
2931 inode_lock(inode);
2932 err = btrfs_delete_subvolume(dir, dentry);
2933 inode_unlock(inode);
2934 if (!err)
2935 d_delete(dentry);
2936
2937 out_dput:
2938 dput(dentry);
2939 out_unlock_dir:
2940 inode_unlock(dir);
2941 out_drop_write:
2942 mnt_drop_write_file(file);
2943 out:
2944 kfree(vol_args);
2945 return err;
2946 }
2947
2948 static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
2949 {
2950 struct inode *inode = file_inode(file);
2951 struct btrfs_root *root = BTRFS_I(inode)->root;
2952 struct btrfs_ioctl_defrag_range_args *range;
2953 int ret;
2954
2955 ret = mnt_want_write_file(file);
2956 if (ret)
2957 return ret;
2958
2959 if (btrfs_root_readonly(root)) {
2960 ret = -EROFS;
2961 goto out;
2962 }
2963
2964 switch (inode->i_mode & S_IFMT) {
2965 case S_IFDIR:
2966 if (!capable(CAP_SYS_ADMIN)) {
2967 ret = -EPERM;
2968 goto out;
2969 }
2970 ret = btrfs_defrag_root(root);
2971 break;
2972 case S_IFREG:
2973 /*
2974 * Note that this does not check the file descriptor for write
2975 * access. This prevents defragmenting executables that are
2976 * running and allows defrag on files open in read-only mode.
2977 */
2978 if (!capable(CAP_SYS_ADMIN) &&
2979 inode_permission(inode, MAY_WRITE)) {
2980 ret = -EPERM;
2981 goto out;
2982 }
2983
2984 range = kzalloc(sizeof(*range), GFP_KERNEL);
2985 if (!range) {
2986 ret = -ENOMEM;
2987 goto out;
2988 }
2989
2990 if (argp) {
2991 if (copy_from_user(range, argp,
2992 sizeof(*range))) {
2993 ret = -EFAULT;
2994 kfree(range);
2995 goto out;
2996 }
2997 /* compression requires us to start the IO */
2998 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2999 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
3000 range->extent_thresh = (u32)-1;
3001 }
3002 } else {
3003 /* the rest are all set to zero by kzalloc */
3004 range->len = (u64)-1;
3005 }
3006 ret = btrfs_defrag_file(file_inode(file), file,
3007 range, BTRFS_OLDEST_GENERATION, 0);
3008 if (ret > 0)
3009 ret = 0;
3010 kfree(range);
3011 break;
3012 default:
3013 ret = -EINVAL;
3014 }
3015 out:
3016 mnt_drop_write_file(file);
3017 return ret;
3018 }
3019
3020 static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg)
3021 {
3022 struct btrfs_ioctl_vol_args *vol_args;
3023 int ret;
3024
3025 if (!capable(CAP_SYS_ADMIN))
3026 return -EPERM;
3027
3028 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags))
3029 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3030
3031 vol_args = memdup_user(arg, sizeof(*vol_args));
3032 if (IS_ERR(vol_args)) {
3033 ret = PTR_ERR(vol_args);
3034 goto out;
3035 }
3036
3037 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
3038 ret = btrfs_init_new_device(fs_info, vol_args->name);
3039
3040 if (!ret)
3041 btrfs_info(fs_info, "disk added %s", vol_args->name);
3042
3043 kfree(vol_args);
3044 out:
3045 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
3046 return ret;
3047 }
3048
3049 static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg)
3050 {
3051 struct inode *inode = file_inode(file);
3052 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3053 struct btrfs_ioctl_vol_args_v2 *vol_args;
3054 int ret;
3055
3056 if (!capable(CAP_SYS_ADMIN))
3057 return -EPERM;
3058
3059 ret = mnt_want_write_file(file);
3060 if (ret)
3061 return ret;
3062
3063 vol_args = memdup_user(arg, sizeof(*vol_args));
3064 if (IS_ERR(vol_args)) {
3065 ret = PTR_ERR(vol_args);
3066 goto err_drop;
3067 }
3068
3069 /* Check for compatibility reject unknown flags */
3070 if (vol_args->flags & ~BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED) {
3071 ret = -EOPNOTSUPP;
3072 goto out;
3073 }
3074
3075 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
3076 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3077 goto out;
3078 }
3079
3080 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) {
3081 ret = btrfs_rm_device(fs_info, NULL, vol_args->devid);
3082 } else {
3083 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
3084 ret = btrfs_rm_device(fs_info, vol_args->name, 0);
3085 }
3086 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
3087
3088 if (!ret) {
3089 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID)
3090 btrfs_info(fs_info, "device deleted: id %llu",
3091 vol_args->devid);
3092 else
3093 btrfs_info(fs_info, "device deleted: %s",
3094 vol_args->name);
3095 }
3096 out:
3097 kfree(vol_args);
3098 err_drop:
3099 mnt_drop_write_file(file);
3100 return ret;
3101 }
3102
3103 static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
3104 {
3105 struct inode *inode = file_inode(file);
3106 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3107 struct btrfs_ioctl_vol_args *vol_args;
3108 int ret;
3109
3110 if (!capable(CAP_SYS_ADMIN))
3111 return -EPERM;
3112
3113 ret = mnt_want_write_file(file);
3114 if (ret)
3115 return ret;
3116
3117 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
3118 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3119 goto out_drop_write;
3120 }
3121
3122 vol_args = memdup_user(arg, sizeof(*vol_args));
3123 if (IS_ERR(vol_args)) {
3124 ret = PTR_ERR(vol_args);
3125 goto out;
3126 }
3127
3128 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
3129 ret = btrfs_rm_device(fs_info, vol_args->name, 0);
3130
3131 if (!ret)
3132 btrfs_info(fs_info, "disk deleted %s", vol_args->name);
3133 kfree(vol_args);
3134 out:
3135 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
3136 out_drop_write:
3137 mnt_drop_write_file(file);
3138
3139 return ret;
3140 }
3141
3142 static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info,
3143 void __user *arg)
3144 {
3145 struct btrfs_ioctl_fs_info_args *fi_args;
3146 struct btrfs_device *device;
3147 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
3148 int ret = 0;
3149
3150 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
3151 if (!fi_args)
3152 return -ENOMEM;
3153
3154 rcu_read_lock();
3155 fi_args->num_devices = fs_devices->num_devices;
3156
3157 list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
3158 if (device->devid > fi_args->max_id)
3159 fi_args->max_id = device->devid;
3160 }
3161 rcu_read_unlock();
3162
3163 memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid));
3164 fi_args->nodesize = fs_info->nodesize;
3165 fi_args->sectorsize = fs_info->sectorsize;
3166 fi_args->clone_alignment = fs_info->sectorsize;
3167
3168 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
3169 ret = -EFAULT;
3170
3171 kfree(fi_args);
3172 return ret;
3173 }
3174
3175 static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info,
3176 void __user *arg)
3177 {
3178 struct btrfs_ioctl_dev_info_args *di_args;
3179 struct btrfs_device *dev;
3180 int ret = 0;
3181 char *s_uuid = NULL;
3182
3183 di_args = memdup_user(arg, sizeof(*di_args));
3184 if (IS_ERR(di_args))
3185 return PTR_ERR(di_args);
3186
3187 if (!btrfs_is_empty_uuid(di_args->uuid))
3188 s_uuid = di_args->uuid;
3189
3190 rcu_read_lock();
3191 dev = btrfs_find_device(fs_info, di_args->devid, s_uuid, NULL);
3192
3193 if (!dev) {
3194 ret = -ENODEV;
3195 goto out;
3196 }
3197
3198 di_args->devid = dev->devid;
3199 di_args->bytes_used = btrfs_device_get_bytes_used(dev);
3200 di_args->total_bytes = btrfs_device_get_total_bytes(dev);
3201 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
3202 if (dev->name) {
3203 strncpy(di_args->path, rcu_str_deref(dev->name),
3204 sizeof(di_args->path) - 1);
3205 di_args->path[sizeof(di_args->path) - 1] = 0;
3206 } else {
3207 di_args->path[0] = '\0';
3208 }
3209
3210 out:
3211 rcu_read_unlock();
3212 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
3213 ret = -EFAULT;
3214
3215 kfree(di_args);
3216 return ret;
3217 }
3218
3219 static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1,
3220 struct inode *inode2, u64 loff2, u64 len)
3221 {
3222 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
3223 unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
3224 }
3225
3226 static void btrfs_double_extent_lock(struct inode *inode1, u64 loff1,
3227 struct inode *inode2, u64 loff2, u64 len)
3228 {
3229 if (inode1 < inode2) {
3230 swap(inode1, inode2);
3231 swap(loff1, loff2);
3232 } else if (inode1 == inode2 && loff2 < loff1) {
3233 swap(loff1, loff2);
3234 }
3235 lock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
3236 lock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
3237 }
3238
3239 static int btrfs_extent_same_range(struct inode *src, u64 loff, u64 olen,
3240 struct inode *dst, u64 dst_loff)
3241 {
3242 u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
3243 int ret;
3244 u64 len = olen;
3245
3246 if (loff + len == src->i_size)
3247 len = ALIGN(src->i_size, bs) - loff;
3248 /*
3249 * For same inode case we don't want our length pushed out past i_size
3250 * as comparing that data range makes no sense.
3251 *
3252 * This effectively means we require aligned extents for the single
3253 * inode case, whereas the other cases allow an unaligned length so long
3254 * as it ends at i_size.
3255 */
3256 if (dst == src && len != olen)
3257 return -EINVAL;
3258
3259 /*
3260 * Lock destination range to serialize with concurrent readpages() and
3261 * source range to serialize with relocation.
3262 */
3263 btrfs_double_extent_lock(src, loff, dst, dst_loff, len);
3264 ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1);
3265 btrfs_double_extent_unlock(src, loff, dst, dst_loff, len);
3266
3267 return ret;
3268 }
3269
3270 #define BTRFS_MAX_DEDUPE_LEN SZ_16M
3271
3272 static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
3273 struct inode *dst, u64 dst_loff)
3274 {
3275 int ret;
3276 int num_pages = PAGE_ALIGN(BTRFS_MAX_DEDUPE_LEN) >> PAGE_SHIFT;
3277 u64 i, tail_len, chunk_count;
3278 struct btrfs_root *root_dst = BTRFS_I(dst)->root;
3279
3280 spin_lock(&root_dst->root_item_lock);
3281 if (root_dst->send_in_progress) {
3282 btrfs_warn_rl(root_dst->fs_info,
3283 "cannot deduplicate to root %llu while send operations are using it (%d in progress)",
3284 root_dst->root_key.objectid,
3285 root_dst->send_in_progress);
3286 spin_unlock(&root_dst->root_item_lock);
3287 return -EAGAIN;
3288 }
3289 root_dst->dedupe_in_progress++;
3290 spin_unlock(&root_dst->root_item_lock);
3291
3292 /* don't make the dst file partly checksummed */
3293 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
3294 (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM))
3295 return -EINVAL;
3296
3297 if (IS_SWAPFILE(src) || IS_SWAPFILE(dst))
3298 return -ETXTBSY;
3299
3300 tail_len = olen % BTRFS_MAX_DEDUPE_LEN;
3301 chunk_count = div_u64(olen, BTRFS_MAX_DEDUPE_LEN);
3302 if (chunk_count == 0)
3303 num_pages = PAGE_ALIGN(tail_len) >> PAGE_SHIFT;
3304
3305 for (i = 0; i < chunk_count; i++) {
3306 ret = btrfs_extent_same_range(src, loff, BTRFS_MAX_DEDUPE_LEN,
3307 dst, dst_loff);
3308 if (ret)
3309 goto out;
3310
3311 loff += BTRFS_MAX_DEDUPE_LEN;
3312 dst_loff += BTRFS_MAX_DEDUPE_LEN;
3313 }
3314
3315 if (tail_len > 0)
3316 ret = btrfs_extent_same_range(src, loff, tail_len, dst,
3317 dst_loff);
3318 out:
3319 spin_lock(&root_dst->root_item_lock);
3320 root_dst->dedupe_in_progress--;
3321 spin_unlock(&root_dst->root_item_lock);
3322
3323 return ret;
3324 }
3325
3326 static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
3327 struct inode *inode,
3328 u64 endoff,
3329 const u64 destoff,
3330 const u64 olen,
3331 int no_time_update)
3332 {
3333 struct btrfs_root *root = BTRFS_I(inode)->root;
3334 int ret;
3335
3336 inode_inc_iversion(inode);
3337 if (!no_time_update)
3338 inode->i_mtime = inode->i_ctime = current_time(inode);
3339 /*
3340 * We round up to the block size at eof when determining which
3341 * extents to clone above, but shouldn't round up the file size.
3342 */
3343 if (endoff > destoff + olen)
3344 endoff = destoff + olen;
3345 if (endoff > inode->i_size)
3346 btrfs_i_size_write(BTRFS_I(inode), endoff);
3347
3348 ret = btrfs_update_inode(trans, root, inode);
3349 if (ret) {
3350 btrfs_abort_transaction(trans, ret);
3351 btrfs_end_transaction(trans);
3352 goto out;
3353 }
3354 ret = btrfs_end_transaction(trans);
3355 out:
3356 return ret;
3357 }
3358
3359 static void clone_update_extent_map(struct btrfs_inode *inode,
3360 const struct btrfs_trans_handle *trans,
3361 const struct btrfs_path *path,
3362 const u64 hole_offset,
3363 const u64 hole_len)
3364 {
3365 struct extent_map_tree *em_tree = &inode->extent_tree;
3366 struct extent_map *em;
3367 int ret;
3368
3369 em = alloc_extent_map();
3370 if (!em) {
3371 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags);
3372 return;
3373 }
3374
3375 if (path) {
3376 struct btrfs_file_extent_item *fi;
3377
3378 fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
3379 struct btrfs_file_extent_item);
3380 btrfs_extent_item_to_extent_map(inode, path, fi, false, em);
3381 em->generation = -1;
3382 if (btrfs_file_extent_type(path->nodes[0], fi) ==
3383 BTRFS_FILE_EXTENT_INLINE)
3384 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3385 &inode->runtime_flags);
3386 } else {
3387 em->start = hole_offset;
3388 em->len = hole_len;
3389 em->ram_bytes = em->len;
3390 em->orig_start = hole_offset;
3391 em->block_start = EXTENT_MAP_HOLE;
3392 em->block_len = 0;
3393 em->orig_block_len = 0;
3394 em->compress_type = BTRFS_COMPRESS_NONE;
3395 em->generation = trans->transid;
3396 }
3397
3398 while (1) {
3399 write_lock(&em_tree->lock);
3400 ret = add_extent_mapping(em_tree, em, 1);
3401 write_unlock(&em_tree->lock);
3402 if (ret != -EEXIST) {
3403 free_extent_map(em);
3404 break;
3405 }
3406 btrfs_drop_extent_cache(inode, em->start,
3407 em->start + em->len - 1, 0);
3408 }
3409
3410 if (ret)
3411 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags);
3412 }
3413
3414 /*
3415 * Make sure we do not end up inserting an inline extent into a file that has
3416 * already other (non-inline) extents. If a file has an inline extent it can
3417 * not have any other extents and the (single) inline extent must start at the
3418 * file offset 0. Failing to respect these rules will lead to file corruption,
3419 * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc
3420 *
3421 * We can have extents that have been already written to disk or we can have
3422 * dirty ranges still in delalloc, in which case the extent maps and items are
3423 * created only when we run delalloc, and the delalloc ranges might fall outside
3424 * the range we are currently locking in the inode's io tree. So we check the
3425 * inode's i_size because of that (i_size updates are done while holding the
3426 * i_mutex, which we are holding here).
3427 * We also check to see if the inode has a size not greater than "datal" but has
3428 * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are
3429 * protected against such concurrent fallocate calls by the i_mutex).
3430 *
3431 * If the file has no extents but a size greater than datal, do not allow the
3432 * copy because we would need turn the inline extent into a non-inline one (even
3433 * with NO_HOLES enabled). If we find our destination inode only has one inline
3434 * extent, just overwrite it with the source inline extent if its size is less
3435 * than the source extent's size, or we could copy the source inline extent's
3436 * data into the destination inode's inline extent if the later is greater then
3437 * the former.
3438 */
3439 static int clone_copy_inline_extent(struct inode *dst,
3440 struct btrfs_trans_handle *trans,
3441 struct btrfs_path *path,
3442 struct btrfs_key *new_key,
3443 const u64 drop_start,
3444 const u64 datal,
3445 const u64 skip,
3446 const u64 size,
3447 char *inline_data)
3448 {
3449 struct btrfs_fs_info *fs_info = btrfs_sb(dst->i_sb);
3450 struct btrfs_root *root = BTRFS_I(dst)->root;
3451 const u64 aligned_end = ALIGN(new_key->offset + datal,
3452 fs_info->sectorsize);
3453 int ret;
3454 struct btrfs_key key;
3455
3456 if (new_key->offset > 0)
3457 return -EOPNOTSUPP;
3458
3459 key.objectid = btrfs_ino(BTRFS_I(dst));
3460 key.type = BTRFS_EXTENT_DATA_KEY;
3461 key.offset = 0;
3462 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3463 if (ret < 0) {
3464 return ret;
3465 } else if (ret > 0) {
3466 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
3467 ret = btrfs_next_leaf(root, path);
3468 if (ret < 0)
3469 return ret;
3470 else if (ret > 0)
3471 goto copy_inline_extent;
3472 }
3473 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
3474 if (key.objectid == btrfs_ino(BTRFS_I(dst)) &&
3475 key.type == BTRFS_EXTENT_DATA_KEY) {
3476 ASSERT(key.offset > 0);
3477 return -EOPNOTSUPP;
3478 }
3479 } else if (i_size_read(dst) <= datal) {
3480 struct btrfs_file_extent_item *ei;
3481 u64 ext_len;
3482
3483 /*
3484 * If the file size is <= datal, make sure there are no other
3485 * extents following (can happen do to an fallocate call with
3486 * the flag FALLOC_FL_KEEP_SIZE).
3487 */
3488 ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
3489 struct btrfs_file_extent_item);
3490 /*
3491 * If it's an inline extent, it can not have other extents
3492 * following it.
3493 */
3494 if (btrfs_file_extent_type(path->nodes[0], ei) ==
3495 BTRFS_FILE_EXTENT_INLINE)
3496 goto copy_inline_extent;
3497
3498 ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei);
3499 if (ext_len > aligned_end)
3500 return -EOPNOTSUPP;
3501
3502 ret = btrfs_next_item(root, path);
3503 if (ret < 0) {
3504 return ret;
3505 } else if (ret == 0) {
3506 btrfs_item_key_to_cpu(path->nodes[0], &key,
3507 path->slots[0]);
3508 if (key.objectid == btrfs_ino(BTRFS_I(dst)) &&
3509 key.type == BTRFS_EXTENT_DATA_KEY)
3510 return -EOPNOTSUPP;
3511 }
3512 }
3513
3514 copy_inline_extent:
3515 /*
3516 * We have no extent items, or we have an extent at offset 0 which may
3517 * or may not be inlined. All these cases are dealt the same way.
3518 */
3519 if (i_size_read(dst) > datal) {
3520 /*
3521 * If the destination inode has an inline extent...
3522 * This would require copying the data from the source inline
3523 * extent into the beginning of the destination's inline extent.
3524 * But this is really complex, both extents can be compressed
3525 * or just one of them, which would require decompressing and
3526 * re-compressing data (which could increase the new compressed
3527 * size, not allowing the compressed data to fit anymore in an
3528 * inline extent).
3529 * So just don't support this case for now (it should be rare,
3530 * we are not really saving space when cloning inline extents).
3531 */
3532 return -EOPNOTSUPP;
3533 }
3534
3535 btrfs_release_path(path);
3536 ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1);
3537 if (ret)
3538 return ret;
3539 ret = btrfs_insert_empty_item(trans, root, path, new_key, size);
3540 if (ret)
3541 return ret;
3542
3543 if (skip) {
3544 const u32 start = btrfs_file_extent_calc_inline_size(0);
3545
3546 memmove(inline_data + start, inline_data + start + skip, datal);
3547 }
3548
3549 write_extent_buffer(path->nodes[0], inline_data,
3550 btrfs_item_ptr_offset(path->nodes[0],
3551 path->slots[0]),
3552 size);
3553 inode_add_bytes(dst, datal);
3554
3555 return 0;
3556 }
3557
3558 /**
3559 * btrfs_clone() - clone a range from inode file to another
3560 *
3561 * @src: Inode to clone from
3562 * @inode: Inode to clone to
3563 * @off: Offset within source to start clone from
3564 * @olen: Original length, passed by user, of range to clone
3565 * @olen_aligned: Block-aligned value of olen
3566 * @destoff: Offset within @inode to start clone
3567 * @no_time_update: Whether to update mtime/ctime on the target inode
3568 */
3569 static int btrfs_clone(struct inode *src, struct inode *inode,
3570 const u64 off, const u64 olen, const u64 olen_aligned,
3571 const u64 destoff, int no_time_update)
3572 {
3573 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3574 struct btrfs_root *root = BTRFS_I(inode)->root;
3575 struct btrfs_path *path = NULL;
3576 struct extent_buffer *leaf;
3577 struct btrfs_trans_handle *trans;
3578 char *buf = NULL;
3579 struct btrfs_key key;
3580 u32 nritems;
3581 int slot;
3582 int ret;
3583 const u64 len = olen_aligned;
3584 u64 last_dest_end = destoff;
3585
3586 ret = -ENOMEM;
3587 buf = kvmalloc(fs_info->nodesize, GFP_KERNEL);
3588 if (!buf)
3589 return ret;
3590
3591 path = btrfs_alloc_path();
3592 if (!path) {
3593 kvfree(buf);
3594 return ret;
3595 }
3596
3597 path->reada = READA_FORWARD;
3598 /* clone data */
3599 key.objectid = btrfs_ino(BTRFS_I(src));
3600 key.type = BTRFS_EXTENT_DATA_KEY;
3601 key.offset = off;
3602
3603 while (1) {
3604 u64 next_key_min_offset = key.offset + 1;
3605
3606 /*
3607 * note the key will change type as we walk through the
3608 * tree.
3609 */
3610 path->leave_spinning = 1;
3611 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
3612 0, 0);
3613 if (ret < 0)
3614 goto out;
3615 /*
3616 * First search, if no extent item that starts at offset off was
3617 * found but the previous item is an extent item, it's possible
3618 * it might overlap our target range, therefore process it.
3619 */
3620 if (key.offset == off && ret > 0 && path->slots[0] > 0) {
3621 btrfs_item_key_to_cpu(path->nodes[0], &key,
3622 path->slots[0] - 1);
3623 if (key.type == BTRFS_EXTENT_DATA_KEY)
3624 path->slots[0]--;
3625 }
3626
3627 nritems = btrfs_header_nritems(path->nodes[0]);
3628 process_slot:
3629 if (path->slots[0] >= nritems) {
3630 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
3631 if (ret < 0)
3632 goto out;
3633 if (ret > 0)
3634 break;
3635 nritems = btrfs_header_nritems(path->nodes[0]);
3636 }
3637 leaf = path->nodes[0];
3638 slot = path->slots[0];
3639
3640 btrfs_item_key_to_cpu(leaf, &key, slot);
3641 if (key.type > BTRFS_EXTENT_DATA_KEY ||
3642 key.objectid != btrfs_ino(BTRFS_I(src)))
3643 break;
3644
3645 if (key.type == BTRFS_EXTENT_DATA_KEY) {
3646 struct btrfs_file_extent_item *extent;
3647 int type;
3648 u32 size;
3649 struct btrfs_key new_key;
3650 u64 disko = 0, diskl = 0;
3651 u64 datao = 0, datal = 0;
3652 u8 comp;
3653 u64 drop_start;
3654
3655 extent = btrfs_item_ptr(leaf, slot,
3656 struct btrfs_file_extent_item);
3657 comp = btrfs_file_extent_compression(leaf, extent);
3658 type = btrfs_file_extent_type(leaf, extent);
3659 if (type == BTRFS_FILE_EXTENT_REG ||
3660 type == BTRFS_FILE_EXTENT_PREALLOC) {
3661 disko = btrfs_file_extent_disk_bytenr(leaf,
3662 extent);
3663 diskl = btrfs_file_extent_disk_num_bytes(leaf,
3664 extent);
3665 datao = btrfs_file_extent_offset(leaf, extent);
3666 datal = btrfs_file_extent_num_bytes(leaf,
3667 extent);
3668 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3669 /* take upper bound, may be compressed */
3670 datal = btrfs_file_extent_ram_bytes(leaf,
3671 extent);
3672 }
3673
3674 /*
3675 * The first search might have left us at an extent
3676 * item that ends before our target range's start, can
3677 * happen if we have holes and NO_HOLES feature enabled.
3678 */
3679 if (key.offset + datal <= off) {
3680 path->slots[0]++;
3681 goto process_slot;
3682 } else if (key.offset >= off + len) {
3683 break;
3684 }
3685 next_key_min_offset = key.offset + datal;
3686 size = btrfs_item_size_nr(leaf, slot);
3687 read_extent_buffer(leaf, buf,
3688 btrfs_item_ptr_offset(leaf, slot),
3689 size);
3690
3691 btrfs_release_path(path);
3692 path->leave_spinning = 0;
3693
3694 memcpy(&new_key, &key, sizeof(new_key));
3695 new_key.objectid = btrfs_ino(BTRFS_I(inode));
3696 if (off <= key.offset)
3697 new_key.offset = key.offset + destoff - off;
3698 else
3699 new_key.offset = destoff;
3700
3701 /*
3702 * Deal with a hole that doesn't have an extent item
3703 * that represents it (NO_HOLES feature enabled).
3704 * This hole is either in the middle of the cloning
3705 * range or at the beginning (fully overlaps it or
3706 * partially overlaps it).
3707 */
3708 if (new_key.offset != last_dest_end)
3709 drop_start = last_dest_end;
3710 else
3711 drop_start = new_key.offset;
3712
3713 /*
3714 * 1 - adjusting old extent (we may have to split it)
3715 * 1 - add new extent
3716 * 1 - inode update
3717 */
3718 trans = btrfs_start_transaction(root, 3);
3719 if (IS_ERR(trans)) {
3720 ret = PTR_ERR(trans);
3721 goto out;
3722 }
3723
3724 if (type == BTRFS_FILE_EXTENT_REG ||
3725 type == BTRFS_FILE_EXTENT_PREALLOC) {
3726 /*
3727 * a | --- range to clone ---| b
3728 * | ------------- extent ------------- |
3729 */
3730
3731 /* subtract range b */
3732 if (key.offset + datal > off + len)
3733 datal = off + len - key.offset;
3734
3735 /* subtract range a */
3736 if (off > key.offset) {
3737 datao += off - key.offset;
3738 datal -= off - key.offset;
3739 }
3740
3741 ret = btrfs_drop_extents(trans, root, inode,
3742 drop_start,
3743 new_key.offset + datal,
3744 1);
3745 if (ret) {
3746 if (ret != -EOPNOTSUPP)
3747 btrfs_abort_transaction(trans,
3748 ret);
3749 btrfs_end_transaction(trans);
3750 goto out;
3751 }
3752
3753 ret = btrfs_insert_empty_item(trans, root, path,
3754 &new_key, size);
3755 if (ret) {
3756 btrfs_abort_transaction(trans, ret);
3757 btrfs_end_transaction(trans);
3758 goto out;
3759 }
3760
3761 leaf = path->nodes[0];
3762 slot = path->slots[0];
3763 write_extent_buffer(leaf, buf,
3764 btrfs_item_ptr_offset(leaf, slot),
3765 size);
3766
3767 extent = btrfs_item_ptr(leaf, slot,
3768 struct btrfs_file_extent_item);
3769
3770 /* disko == 0 means it's a hole */
3771 if (!disko)
3772 datao = 0;
3773
3774 btrfs_set_file_extent_offset(leaf, extent,
3775 datao);
3776 btrfs_set_file_extent_num_bytes(leaf, extent,
3777 datal);
3778
3779 if (disko) {
3780 inode_add_bytes(inode, datal);
3781 ret = btrfs_inc_extent_ref(trans,
3782 root,
3783 disko, diskl, 0,
3784 root->root_key.objectid,
3785 btrfs_ino(BTRFS_I(inode)),
3786 new_key.offset - datao);
3787 if (ret) {
3788 btrfs_abort_transaction(trans,
3789 ret);
3790 btrfs_end_transaction(trans);
3791 goto out;
3792
3793 }
3794 }
3795 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3796 u64 skip = 0;
3797 u64 trim = 0;
3798
3799 if (off > key.offset) {
3800 skip = off - key.offset;
3801 new_key.offset += skip;
3802 }
3803
3804 if (key.offset + datal > off + len)
3805 trim = key.offset + datal - (off + len);
3806
3807 if (comp && (skip || trim)) {
3808 ret = -EINVAL;
3809 btrfs_end_transaction(trans);
3810 goto out;
3811 }
3812 size -= skip + trim;
3813 datal -= skip + trim;
3814
3815 ret = clone_copy_inline_extent(inode,
3816 trans, path,
3817 &new_key,
3818 drop_start,
3819 datal,
3820 skip, size, buf);
3821 if (ret) {
3822 if (ret != -EOPNOTSUPP)
3823 btrfs_abort_transaction(trans,
3824 ret);
3825 btrfs_end_transaction(trans);
3826 goto out;
3827 }
3828 leaf = path->nodes[0];
3829 slot = path->slots[0];
3830 }
3831
3832 /* If we have an implicit hole (NO_HOLES feature). */
3833 if (drop_start < new_key.offset)
3834 clone_update_extent_map(BTRFS_I(inode), trans,
3835 NULL, drop_start,
3836 new_key.offset - drop_start);
3837
3838 clone_update_extent_map(BTRFS_I(inode), trans,
3839 path, 0, 0);
3840
3841 btrfs_mark_buffer_dirty(leaf);
3842 btrfs_release_path(path);
3843
3844 last_dest_end = ALIGN(new_key.offset + datal,
3845 fs_info->sectorsize);
3846 ret = clone_finish_inode_update(trans, inode,
3847 last_dest_end,
3848 destoff, olen,
3849 no_time_update);
3850 if (ret)
3851 goto out;
3852 if (new_key.offset + datal >= destoff + len)
3853 break;
3854 }
3855 btrfs_release_path(path);
3856 key.offset = next_key_min_offset;
3857
3858 if (fatal_signal_pending(current)) {
3859 ret = -EINTR;
3860 goto out;
3861 }
3862 }
3863 ret = 0;
3864
3865 if (last_dest_end < destoff + len) {
3866 /*
3867 * We have an implicit hole (NO_HOLES feature is enabled) that
3868 * fully or partially overlaps our cloning range at its end.
3869 */
3870 btrfs_release_path(path);
3871
3872 /*
3873 * 1 - remove extent(s)
3874 * 1 - inode update
3875 */
3876 trans = btrfs_start_transaction(root, 2);
3877 if (IS_ERR(trans)) {
3878 ret = PTR_ERR(trans);
3879 goto out;
3880 }
3881 ret = btrfs_drop_extents(trans, root, inode,
3882 last_dest_end, destoff + len, 1);
3883 if (ret) {
3884 if (ret != -EOPNOTSUPP)
3885 btrfs_abort_transaction(trans, ret);
3886 btrfs_end_transaction(trans);
3887 goto out;
3888 }
3889 clone_update_extent_map(BTRFS_I(inode), trans, NULL,
3890 last_dest_end,
3891 destoff + len - last_dest_end);
3892 ret = clone_finish_inode_update(trans, inode, destoff + len,
3893 destoff, olen, no_time_update);
3894 }
3895
3896 out:
3897 btrfs_free_path(path);
3898 kvfree(buf);
3899 return ret;
3900 }
3901
3902 static noinline int btrfs_clone_files(struct file *file, struct file *file_src,
3903 u64 off, u64 olen, u64 destoff)
3904 {
3905 struct inode *inode = file_inode(file);
3906 struct inode *src = file_inode(file_src);
3907 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3908 int ret;
3909 u64 len = olen;
3910 u64 bs = fs_info->sb->s_blocksize;
3911
3912 /*
3913 * TODO:
3914 * - split compressed inline extents. annoying: we need to
3915 * decompress into destination's address_space (the file offset
3916 * may change, so source mapping won't do), then recompress (or
3917 * otherwise reinsert) a subrange.
3918 *
3919 * - split destination inode's inline extents. The inline extents can
3920 * be either compressed or non-compressed.
3921 */
3922
3923 /* don't make the dst file partly checksummed */
3924 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
3925 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
3926 return -EINVAL;
3927
3928 if (IS_SWAPFILE(src) || IS_SWAPFILE(inode))
3929 return -ETXTBSY;
3930
3931 /*
3932 * VFS's generic_remap_file_range_prep() protects us from cloning the
3933 * eof block into the middle of a file, which would result in corruption
3934 * if the file size is not blocksize aligned. So we don't need to check
3935 * for that case here.
3936 */
3937 if (off + len == src->i_size)
3938 len = ALIGN(src->i_size, bs) - off;
3939
3940 if (destoff > inode->i_size) {
3941 const u64 wb_start = ALIGN_DOWN(inode->i_size, bs);
3942
3943 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
3944 if (ret)
3945 return ret;
3946 /*
3947 * We may have truncated the last block if the inode's size is
3948 * not sector size aligned, so we need to wait for writeback to
3949 * complete before proceeding further, otherwise we can race
3950 * with cloning and attempt to increment a reference to an
3951 * extent that no longer exists (writeback completed right after
3952 * we found the previous extent covering eof and before we
3953 * attempted to increment its reference count).
3954 */
3955 ret = btrfs_wait_ordered_range(inode, wb_start,
3956 destoff - wb_start);
3957 if (ret)
3958 return ret;
3959 }
3960
3961 /*
3962 * Lock destination range to serialize with concurrent readpages() and
3963 * source range to serialize with relocation.
3964 */
3965 btrfs_double_extent_lock(src, off, inode, destoff, len);
3966 ret = btrfs_clone(src, inode, off, olen, len, destoff, 0);
3967 btrfs_double_extent_unlock(src, off, inode, destoff, len);
3968 /*
3969 * Truncate page cache pages so that future reads will see the cloned
3970 * data immediately and not the previous data.
3971 */
3972 truncate_inode_pages_range(&inode->i_data,
3973 round_down(destoff, PAGE_SIZE),
3974 round_up(destoff + len, PAGE_SIZE) - 1);
3975
3976 return ret;
3977 }
3978
3979 static int btrfs_remap_file_range_prep(struct file *file_in, loff_t pos_in,
3980 struct file *file_out, loff_t pos_out,
3981 loff_t *len, unsigned int remap_flags)
3982 {
3983 struct inode *inode_in = file_inode(file_in);
3984 struct inode *inode_out = file_inode(file_out);
3985 u64 bs = BTRFS_I(inode_out)->root->fs_info->sb->s_blocksize;
3986 bool same_inode = inode_out == inode_in;
3987 u64 wb_len;
3988 int ret;
3989
3990 if (!(remap_flags & REMAP_FILE_DEDUP)) {
3991 struct btrfs_root *root_out = BTRFS_I(inode_out)->root;
3992
3993 if (btrfs_root_readonly(root_out))
3994 return -EROFS;
3995
3996 if (file_in->f_path.mnt != file_out->f_path.mnt ||
3997 inode_in->i_sb != inode_out->i_sb)
3998 return -EXDEV;
3999 }
4000
4001 if (same_inode)
4002 inode_lock(inode_in);
4003 else
4004 lock_two_nondirectories(inode_in, inode_out);
4005
4006 /*
4007 * Now that the inodes are locked, we need to start writeback ourselves
4008 * and can not rely on the writeback from the VFS's generic helper
4009 * generic_remap_file_range_prep() because:
4010 *
4011 * 1) For compression we must call filemap_fdatawrite_range() range
4012 * twice (btrfs_fdatawrite_range() does it for us), and the generic
4013 * helper only calls it once;
4014 *
4015 * 2) filemap_fdatawrite_range(), called by the generic helper only
4016 * waits for the writeback to complete, i.e. for IO to be done, and
4017 * not for the ordered extents to complete. We need to wait for them
4018 * to complete so that new file extent items are in the fs tree.
4019 */
4020 if (*len == 0 && !(remap_flags & REMAP_FILE_DEDUP))
4021 wb_len = ALIGN(inode_in->i_size, bs) - ALIGN_DOWN(pos_in, bs);
4022 else
4023 wb_len = ALIGN(*len, bs);
4024
4025 /*
4026 * Since we don't lock ranges, wait for ongoing lockless dio writes (as
4027 * any in progress could create its ordered extents after we wait for
4028 * existing ordered extents below).
4029 */
4030 inode_dio_wait(inode_in);
4031 if (!same_inode)
4032 inode_dio_wait(inode_out);
4033
4034 ret = btrfs_wait_ordered_range(inode_in, ALIGN_DOWN(pos_in, bs),
4035 wb_len);
4036 if (ret < 0)
4037 goto out_unlock;
4038 ret = btrfs_wait_ordered_range(inode_out, ALIGN_DOWN(pos_out, bs),
4039 wb_len);
4040 if (ret < 0)
4041 goto out_unlock;
4042
4043 ret = generic_remap_file_range_prep(file_in, pos_in, file_out, pos_out,
4044 len, remap_flags);
4045 if (ret < 0 || *len == 0)
4046 goto out_unlock;
4047
4048 return 0;
4049
4050 out_unlock:
4051 if (same_inode)
4052 inode_unlock(inode_in);
4053 else
4054 unlock_two_nondirectories(inode_in, inode_out);
4055
4056 return ret;
4057 }
4058
4059 loff_t btrfs_remap_file_range(struct file *src_file, loff_t off,
4060 struct file *dst_file, loff_t destoff, loff_t len,
4061 unsigned int remap_flags)
4062 {
4063 struct inode *src_inode = file_inode(src_file);
4064 struct inode *dst_inode = file_inode(dst_file);
4065 bool same_inode = dst_inode == src_inode;
4066 int ret;
4067
4068 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
4069 return -EINVAL;
4070
4071 ret = btrfs_remap_file_range_prep(src_file, off, dst_file, destoff,
4072 &len, remap_flags);
4073 if (ret < 0 || len == 0)
4074 return ret;
4075
4076 if (remap_flags & REMAP_FILE_DEDUP)
4077 ret = btrfs_extent_same(src_inode, off, len, dst_inode, destoff);
4078 else
4079 ret = btrfs_clone_files(dst_file, src_file, off, len, destoff);
4080
4081 if (same_inode)
4082 inode_unlock(src_inode);
4083 else
4084 unlock_two_nondirectories(src_inode, dst_inode);
4085
4086 return ret < 0 ? ret : len;
4087 }
4088
4089 static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
4090 {
4091 struct inode *inode = file_inode(file);
4092 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4093 struct btrfs_root *root = BTRFS_I(inode)->root;
4094 struct btrfs_root *new_root;
4095 struct btrfs_dir_item *di;
4096 struct btrfs_trans_handle *trans;
4097 struct btrfs_path *path;
4098 struct btrfs_key location;
4099 struct btrfs_disk_key disk_key;
4100 u64 objectid = 0;
4101 u64 dir_id;
4102 int ret;
4103
4104 if (!capable(CAP_SYS_ADMIN))
4105 return -EPERM;
4106
4107 ret = mnt_want_write_file(file);
4108 if (ret)
4109 return ret;
4110
4111 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
4112 ret = -EFAULT;
4113 goto out;
4114 }
4115
4116 if (!objectid)
4117 objectid = BTRFS_FS_TREE_OBJECTID;
4118
4119 location.objectid = objectid;
4120 location.type = BTRFS_ROOT_ITEM_KEY;
4121 location.offset = (u64)-1;
4122
4123 new_root = btrfs_read_fs_root_no_name(fs_info, &location);
4124 if (IS_ERR(new_root)) {
4125 ret = PTR_ERR(new_root);
4126 goto out;
4127 }
4128 if (!is_fstree(new_root->root_key.objectid)) {
4129 ret = -ENOENT;
4130 goto out;
4131 }
4132
4133 path = btrfs_alloc_path();
4134 if (!path) {
4135 ret = -ENOMEM;
4136 goto out;
4137 }
4138 path->leave_spinning = 1;
4139
4140 trans = btrfs_start_transaction(root, 1);
4141 if (IS_ERR(trans)) {
4142 btrfs_free_path(path);
4143 ret = PTR_ERR(trans);
4144 goto out;
4145 }
4146
4147 dir_id = btrfs_super_root_dir(fs_info->super_copy);
4148 di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path,
4149 dir_id, "default", 7, 1);
4150 if (IS_ERR_OR_NULL(di)) {
4151 btrfs_free_path(path);
4152 btrfs_end_transaction(trans);
4153 btrfs_err(fs_info,
4154 "Umm, you don't have the default diritem, this isn't going to work");
4155 ret = -ENOENT;
4156 goto out;
4157 }
4158
4159 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
4160 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
4161 btrfs_mark_buffer_dirty(path->nodes[0]);
4162 btrfs_free_path(path);
4163
4164 btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL);
4165 btrfs_end_transaction(trans);
4166 out:
4167 mnt_drop_write_file(file);
4168 return ret;
4169 }
4170
4171 static void get_block_group_info(struct list_head *groups_list,
4172 struct btrfs_ioctl_space_info *space)
4173 {
4174 struct btrfs_block_group_cache *block_group;
4175
4176 space->total_bytes = 0;
4177 space->used_bytes = 0;
4178 space->flags = 0;
4179 list_for_each_entry(block_group, groups_list, list) {
4180 space->flags = block_group->flags;
4181 space->total_bytes += block_group->key.offset;
4182 space->used_bytes +=
4183 btrfs_block_group_used(&block_group->item);
4184 }
4185 }
4186
4187 static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info,
4188 void __user *arg)
4189 {
4190 struct btrfs_ioctl_space_args space_args;
4191 struct btrfs_ioctl_space_info space;
4192 struct btrfs_ioctl_space_info *dest;
4193 struct btrfs_ioctl_space_info *dest_orig;
4194 struct btrfs_ioctl_space_info __user *user_dest;
4195 struct btrfs_space_info *info;
4196 static const u64 types[] = {
4197 BTRFS_BLOCK_GROUP_DATA,
4198 BTRFS_BLOCK_GROUP_SYSTEM,
4199 BTRFS_BLOCK_GROUP_METADATA,
4200 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA
4201 };
4202 int num_types = 4;
4203 int alloc_size;
4204 int ret = 0;
4205 u64 slot_count = 0;
4206 int i, c;
4207
4208 if (copy_from_user(&space_args,
4209 (struct btrfs_ioctl_space_args __user *)arg,
4210 sizeof(space_args)))
4211 return -EFAULT;
4212
4213 for (i = 0; i < num_types; i++) {
4214 struct btrfs_space_info *tmp;
4215
4216 info = NULL;
4217 rcu_read_lock();
4218 list_for_each_entry_rcu(tmp, &fs_info->space_info,
4219 list) {
4220 if (tmp->flags == types[i]) {
4221 info = tmp;
4222 break;
4223 }
4224 }
4225 rcu_read_unlock();
4226
4227 if (!info)
4228 continue;
4229
4230 down_read(&info->groups_sem);
4231 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
4232 if (!list_empty(&info->block_groups[c]))
4233 slot_count++;
4234 }
4235 up_read(&info->groups_sem);
4236 }
4237
4238 /*
4239 * Global block reserve, exported as a space_info
4240 */
4241 slot_count++;
4242
4243 /* space_slots == 0 means they are asking for a count */
4244 if (space_args.space_slots == 0) {
4245 space_args.total_spaces = slot_count;
4246 goto out;
4247 }
4248
4249 slot_count = min_t(u64, space_args.space_slots, slot_count);
4250
4251 alloc_size = sizeof(*dest) * slot_count;
4252
4253 /* we generally have at most 6 or so space infos, one for each raid
4254 * level. So, a whole page should be more than enough for everyone
4255 */
4256 if (alloc_size > PAGE_SIZE)
4257 return -ENOMEM;
4258
4259 space_args.total_spaces = 0;
4260 dest = kmalloc(alloc_size, GFP_KERNEL);
4261 if (!dest)
4262 return -ENOMEM;
4263 dest_orig = dest;
4264
4265 /* now we have a buffer to copy into */
4266 for (i = 0; i < num_types; i++) {
4267 struct btrfs_space_info *tmp;
4268
4269 if (!slot_count)
4270 break;
4271
4272 info = NULL;
4273 rcu_read_lock();
4274 list_for_each_entry_rcu(tmp, &fs_info->space_info,
4275 list) {
4276 if (tmp->flags == types[i]) {
4277 info = tmp;
4278 break;
4279 }
4280 }
4281 rcu_read_unlock();
4282
4283 if (!info)
4284 continue;
4285 down_read(&info->groups_sem);
4286 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
4287 if (!list_empty(&info->block_groups[c])) {
4288 get_block_group_info(&info->block_groups[c],
4289 &space);
4290 memcpy(dest, &space, sizeof(space));
4291 dest++;
4292 space_args.total_spaces++;
4293 slot_count--;
4294 }
4295 if (!slot_count)
4296 break;
4297 }
4298 up_read(&info->groups_sem);
4299 }
4300
4301 /*
4302 * Add global block reserve
4303 */
4304 if (slot_count) {
4305 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
4306
4307 spin_lock(&block_rsv->lock);
4308 space.total_bytes = block_rsv->size;
4309 space.used_bytes = block_rsv->size - block_rsv->reserved;
4310 spin_unlock(&block_rsv->lock);
4311 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
4312 memcpy(dest, &space, sizeof(space));
4313 space_args.total_spaces++;
4314 }
4315
4316 user_dest = (struct btrfs_ioctl_space_info __user *)
4317 (arg + sizeof(struct btrfs_ioctl_space_args));
4318
4319 if (copy_to_user(user_dest, dest_orig, alloc_size))
4320 ret = -EFAULT;
4321
4322 kfree(dest_orig);
4323 out:
4324 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
4325 ret = -EFAULT;
4326
4327 return ret;
4328 }
4329
4330 static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
4331 void __user *argp)
4332 {
4333 struct btrfs_trans_handle *trans;
4334 u64 transid;
4335 int ret;
4336
4337 trans = btrfs_attach_transaction_barrier(root);
4338 if (IS_ERR(trans)) {
4339 if (PTR_ERR(trans) != -ENOENT)
4340 return PTR_ERR(trans);
4341
4342 /* No running transaction, don't bother */
4343 transid = root->fs_info->last_trans_committed;
4344 goto out;
4345 }
4346 transid = trans->transid;
4347 ret = btrfs_commit_transaction_async(trans, 0);
4348 if (ret) {
4349 btrfs_end_transaction(trans);
4350 return ret;
4351 }
4352 out:
4353 if (argp)
4354 if (copy_to_user(argp, &transid, sizeof(transid)))
4355 return -EFAULT;
4356 return 0;
4357 }
4358
4359 static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info,
4360 void __user *argp)
4361 {
4362 u64 transid;
4363
4364 if (argp) {
4365 if (copy_from_user(&transid, argp, sizeof(transid)))
4366 return -EFAULT;
4367 } else {
4368 transid = 0; /* current trans */
4369 }
4370 return btrfs_wait_for_commit(fs_info, transid);
4371 }
4372
4373 static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
4374 {
4375 struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
4376 struct btrfs_ioctl_scrub_args *sa;
4377 int ret;
4378
4379 if (!capable(CAP_SYS_ADMIN))
4380 return -EPERM;
4381
4382 sa = memdup_user(arg, sizeof(*sa));
4383 if (IS_ERR(sa))
4384 return PTR_ERR(sa);
4385
4386 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
4387 ret = mnt_want_write_file(file);
4388 if (ret)
4389 goto out;
4390 }
4391
4392 ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end,
4393 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
4394 0);
4395
4396 if (copy_to_user(arg, sa, sizeof(*sa)))
4397 ret = -EFAULT;
4398
4399 if (!(sa->flags & BTRFS_SCRUB_READONLY))
4400 mnt_drop_write_file(file);
4401 out:
4402 kfree(sa);
4403 return ret;
4404 }
4405
4406 static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info)
4407 {
4408 if (!capable(CAP_SYS_ADMIN))
4409 return -EPERM;
4410
4411 return btrfs_scrub_cancel(fs_info);
4412 }
4413
4414 static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info,
4415 void __user *arg)
4416 {
4417 struct btrfs_ioctl_scrub_args *sa;
4418 int ret;
4419
4420 if (!capable(CAP_SYS_ADMIN))
4421 return -EPERM;
4422
4423 sa = memdup_user(arg, sizeof(*sa));
4424 if (IS_ERR(sa))
4425 return PTR_ERR(sa);
4426
4427 ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress);
4428
4429 if (copy_to_user(arg, sa, sizeof(*sa)))
4430 ret = -EFAULT;
4431
4432 kfree(sa);
4433 return ret;
4434 }
4435
4436 static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info,
4437 void __user *arg)
4438 {
4439 struct btrfs_ioctl_get_dev_stats *sa;
4440 int ret;
4441
4442 sa = memdup_user(arg, sizeof(*sa));
4443 if (IS_ERR(sa))
4444 return PTR_ERR(sa);
4445
4446 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
4447 kfree(sa);
4448 return -EPERM;
4449 }
4450
4451 ret = btrfs_get_dev_stats(fs_info, sa);
4452
4453 if (copy_to_user(arg, sa, sizeof(*sa)))
4454 ret = -EFAULT;
4455
4456 kfree(sa);
4457 return ret;
4458 }
4459
4460 static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info,
4461 void __user *arg)
4462 {
4463 struct btrfs_ioctl_dev_replace_args *p;
4464 int ret;
4465
4466 if (!capable(CAP_SYS_ADMIN))
4467 return -EPERM;
4468
4469 p = memdup_user(arg, sizeof(*p));
4470 if (IS_ERR(p))
4471 return PTR_ERR(p);
4472
4473 switch (p->cmd) {
4474 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
4475 if (sb_rdonly(fs_info->sb)) {
4476 ret = -EROFS;
4477 goto out;
4478 }
4479 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
4480 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4481 } else {
4482 ret = btrfs_dev_replace_by_ioctl(fs_info, p);
4483 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
4484 }
4485 break;
4486 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
4487 btrfs_dev_replace_status(fs_info, p);
4488 ret = 0;
4489 break;
4490 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
4491 p->result = btrfs_dev_replace_cancel(fs_info);
4492 ret = 0;
4493 break;
4494 default:
4495 ret = -EINVAL;
4496 break;
4497 }
4498
4499 if (copy_to_user(arg, p, sizeof(*p)))
4500 ret = -EFAULT;
4501 out:
4502 kfree(p);
4503 return ret;
4504 }
4505
4506 static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
4507 {
4508 int ret = 0;
4509 int i;
4510 u64 rel_ptr;
4511 int size;
4512 struct btrfs_ioctl_ino_path_args *ipa = NULL;
4513 struct inode_fs_paths *ipath = NULL;
4514 struct btrfs_path *path;
4515
4516 if (!capable(CAP_DAC_READ_SEARCH))
4517 return -EPERM;
4518
4519 path = btrfs_alloc_path();
4520 if (!path) {
4521 ret = -ENOMEM;
4522 goto out;
4523 }
4524
4525 ipa = memdup_user(arg, sizeof(*ipa));
4526 if (IS_ERR(ipa)) {
4527 ret = PTR_ERR(ipa);
4528 ipa = NULL;
4529 goto out;
4530 }
4531
4532 size = min_t(u32, ipa->size, 4096);
4533 ipath = init_ipath(size, root, path);
4534 if (IS_ERR(ipath)) {
4535 ret = PTR_ERR(ipath);
4536 ipath = NULL;
4537 goto out;
4538 }
4539
4540 ret = paths_from_inode(ipa->inum, ipath);
4541 if (ret < 0)
4542 goto out;
4543
4544 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
4545 rel_ptr = ipath->fspath->val[i] -
4546 (u64)(unsigned long)ipath->fspath->val;
4547 ipath->fspath->val[i] = rel_ptr;
4548 }
4549
4550 ret = copy_to_user((void __user *)(unsigned long)ipa->fspath,
4551 ipath->fspath, size);
4552 if (ret) {
4553 ret = -EFAULT;
4554 goto out;
4555 }
4556
4557 out:
4558 btrfs_free_path(path);
4559 free_ipath(ipath);
4560 kfree(ipa);
4561
4562 return ret;
4563 }
4564
4565 static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
4566 {
4567 struct btrfs_data_container *inodes = ctx;
4568 const size_t c = 3 * sizeof(u64);
4569
4570 if (inodes->bytes_left >= c) {
4571 inodes->bytes_left -= c;
4572 inodes->val[inodes->elem_cnt] = inum;
4573 inodes->val[inodes->elem_cnt + 1] = offset;
4574 inodes->val[inodes->elem_cnt + 2] = root;
4575 inodes->elem_cnt += 3;
4576 } else {
4577 inodes->bytes_missing += c - inodes->bytes_left;
4578 inodes->bytes_left = 0;
4579 inodes->elem_missed += 3;
4580 }
4581
4582 return 0;
4583 }
4584
4585 static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
4586 void __user *arg, int version)
4587 {
4588 int ret = 0;
4589 int size;
4590 struct btrfs_ioctl_logical_ino_args *loi;
4591 struct btrfs_data_container *inodes = NULL;
4592 struct btrfs_path *path = NULL;
4593 bool ignore_offset;
4594
4595 if (!capable(CAP_SYS_ADMIN))
4596 return -EPERM;
4597
4598 loi = memdup_user(arg, sizeof(*loi));
4599 if (IS_ERR(loi))
4600 return PTR_ERR(loi);
4601
4602 if (version == 1) {
4603 ignore_offset = false;
4604 size = min_t(u32, loi->size, SZ_64K);
4605 } else {
4606 /* All reserved bits must be 0 for now */
4607 if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) {
4608 ret = -EINVAL;
4609 goto out_loi;
4610 }
4611 /* Only accept flags we have defined so far */
4612 if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) {
4613 ret = -EINVAL;
4614 goto out_loi;
4615 }
4616 ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET;
4617 size = min_t(u32, loi->size, SZ_16M);
4618 }
4619
4620 path = btrfs_alloc_path();
4621 if (!path) {
4622 ret = -ENOMEM;
4623 goto out;
4624 }
4625
4626 inodes = init_data_container(size);
4627 if (IS_ERR(inodes)) {
4628 ret = PTR_ERR(inodes);
4629 inodes = NULL;
4630 goto out;
4631 }
4632
4633 ret = iterate_inodes_from_logical(loi->logical, fs_info, path,
4634 build_ino_list, inodes, ignore_offset);
4635 if (ret == -EINVAL)
4636 ret = -ENOENT;
4637 if (ret < 0)
4638 goto out;
4639
4640 ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes,
4641 size);
4642 if (ret)
4643 ret = -EFAULT;
4644
4645 out:
4646 btrfs_free_path(path);
4647 kvfree(inodes);
4648 out_loi:
4649 kfree(loi);
4650
4651 return ret;
4652 }
4653
4654 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
4655 struct btrfs_ioctl_balance_args *bargs)
4656 {
4657 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
4658
4659 bargs->flags = bctl->flags;
4660
4661 if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags))
4662 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
4663 if (atomic_read(&fs_info->balance_pause_req))
4664 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
4665 if (atomic_read(&fs_info->balance_cancel_req))
4666 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
4667
4668 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
4669 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
4670 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
4671
4672 spin_lock(&fs_info->balance_lock);
4673 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4674 spin_unlock(&fs_info->balance_lock);
4675 }
4676
4677 static long btrfs_ioctl_balance(struct file *file, void __user *arg)
4678 {
4679 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4680 struct btrfs_fs_info *fs_info = root->fs_info;
4681 struct btrfs_ioctl_balance_args *bargs;
4682 struct btrfs_balance_control *bctl;
4683 bool need_unlock; /* for mut. excl. ops lock */
4684 int ret;
4685
4686 if (!capable(CAP_SYS_ADMIN))
4687 return -EPERM;
4688
4689 ret = mnt_want_write_file(file);
4690 if (ret)
4691 return ret;
4692
4693 again:
4694 if (!test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
4695 mutex_lock(&fs_info->balance_mutex);
4696 need_unlock = true;
4697 goto locked;
4698 }
4699
4700 /*
4701 * mut. excl. ops lock is locked. Three possibilities:
4702 * (1) some other op is running
4703 * (2) balance is running
4704 * (3) balance is paused -- special case (think resume)
4705 */
4706 mutex_lock(&fs_info->balance_mutex);
4707 if (fs_info->balance_ctl) {
4708 /* this is either (2) or (3) */
4709 if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
4710 mutex_unlock(&fs_info->balance_mutex);
4711 /*
4712 * Lock released to allow other waiters to continue,
4713 * we'll reexamine the status again.
4714 */
4715 mutex_lock(&fs_info->balance_mutex);
4716
4717 if (fs_info->balance_ctl &&
4718 !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
4719 /* this is (3) */
4720 need_unlock = false;
4721 goto locked;
4722 }
4723
4724 mutex_unlock(&fs_info->balance_mutex);
4725 goto again;
4726 } else {
4727 /* this is (2) */
4728 mutex_unlock(&fs_info->balance_mutex);
4729 ret = -EINPROGRESS;
4730 goto out;
4731 }
4732 } else {
4733 /* this is (1) */
4734 mutex_unlock(&fs_info->balance_mutex);
4735 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4736 goto out;
4737 }
4738
4739 locked:
4740 BUG_ON(!test_bit(BTRFS_FS_EXCL_OP, &fs_info->flags));
4741
4742 if (arg) {
4743 bargs = memdup_user(arg, sizeof(*bargs));
4744 if (IS_ERR(bargs)) {
4745 ret = PTR_ERR(bargs);
4746 goto out_unlock;
4747 }
4748
4749 if (bargs->flags & BTRFS_BALANCE_RESUME) {
4750 if (!fs_info->balance_ctl) {
4751 ret = -ENOTCONN;
4752 goto out_bargs;
4753 }
4754
4755 bctl = fs_info->balance_ctl;
4756 spin_lock(&fs_info->balance_lock);
4757 bctl->flags |= BTRFS_BALANCE_RESUME;
4758 spin_unlock(&fs_info->balance_lock);
4759
4760 goto do_balance;
4761 }
4762 } else {
4763 bargs = NULL;
4764 }
4765
4766 if (fs_info->balance_ctl) {
4767 ret = -EINPROGRESS;
4768 goto out_bargs;
4769 }
4770
4771 bctl = kzalloc(sizeof(*bctl), GFP_KERNEL);
4772 if (!bctl) {
4773 ret = -ENOMEM;
4774 goto out_bargs;
4775 }
4776
4777 if (arg) {
4778 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
4779 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
4780 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
4781
4782 bctl->flags = bargs->flags;
4783 } else {
4784 /* balance everything - no filters */
4785 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
4786 }
4787
4788 if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
4789 ret = -EINVAL;
4790 goto out_bctl;
4791 }
4792
4793 do_balance:
4794 /*
4795 * Ownership of bctl and filesystem flag BTRFS_FS_EXCL_OP goes to
4796 * btrfs_balance. bctl is freed in reset_balance_state, or, if
4797 * restriper was paused all the way until unmount, in free_fs_info.
4798 * The flag should be cleared after reset_balance_state.
4799 */
4800 need_unlock = false;
4801
4802 ret = btrfs_balance(fs_info, bctl, bargs);
4803 bctl = NULL;
4804
4805 if (arg) {
4806 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4807 ret = -EFAULT;
4808 }
4809
4810 out_bctl:
4811 kfree(bctl);
4812 out_bargs:
4813 kfree(bargs);
4814 out_unlock:
4815 mutex_unlock(&fs_info->balance_mutex);
4816 if (need_unlock)
4817 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
4818 out:
4819 mnt_drop_write_file(file);
4820 return ret;
4821 }
4822
4823 static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd)
4824 {
4825 if (!capable(CAP_SYS_ADMIN))
4826 return -EPERM;
4827
4828 switch (cmd) {
4829 case BTRFS_BALANCE_CTL_PAUSE:
4830 return btrfs_pause_balance(fs_info);
4831 case BTRFS_BALANCE_CTL_CANCEL:
4832 return btrfs_cancel_balance(fs_info);
4833 }
4834
4835 return -EINVAL;
4836 }
4837
4838 static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info,
4839 void __user *arg)
4840 {
4841 struct btrfs_ioctl_balance_args *bargs;
4842 int ret = 0;
4843
4844 if (!capable(CAP_SYS_ADMIN))
4845 return -EPERM;
4846
4847 mutex_lock(&fs_info->balance_mutex);
4848 if (!fs_info->balance_ctl) {
4849 ret = -ENOTCONN;
4850 goto out;
4851 }
4852
4853 bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
4854 if (!bargs) {
4855 ret = -ENOMEM;
4856 goto out;
4857 }
4858
4859 btrfs_update_ioctl_balance_args(fs_info, bargs);
4860
4861 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4862 ret = -EFAULT;
4863
4864 kfree(bargs);
4865 out:
4866 mutex_unlock(&fs_info->balance_mutex);
4867 return ret;
4868 }
4869
4870 static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
4871 {
4872 struct inode *inode = file_inode(file);
4873 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4874 struct btrfs_ioctl_quota_ctl_args *sa;
4875 int ret;
4876
4877 if (!capable(CAP_SYS_ADMIN))
4878 return -EPERM;
4879
4880 ret = mnt_want_write_file(file);
4881 if (ret)
4882 return ret;
4883
4884 sa = memdup_user(arg, sizeof(*sa));
4885 if (IS_ERR(sa)) {
4886 ret = PTR_ERR(sa);
4887 goto drop_write;
4888 }
4889
4890 down_write(&fs_info->subvol_sem);
4891
4892 switch (sa->cmd) {
4893 case BTRFS_QUOTA_CTL_ENABLE:
4894 ret = btrfs_quota_enable(fs_info);
4895 break;
4896 case BTRFS_QUOTA_CTL_DISABLE:
4897 ret = btrfs_quota_disable(fs_info);
4898 break;
4899 default:
4900 ret = -EINVAL;
4901 break;
4902 }
4903
4904 kfree(sa);
4905 up_write(&fs_info->subvol_sem);
4906 drop_write:
4907 mnt_drop_write_file(file);
4908 return ret;
4909 }
4910
4911 static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
4912 {
4913 struct inode *inode = file_inode(file);
4914 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4915 struct btrfs_root *root = BTRFS_I(inode)->root;
4916 struct btrfs_ioctl_qgroup_assign_args *sa;
4917 struct btrfs_trans_handle *trans;
4918 int ret;
4919 int err;
4920
4921 if (!capable(CAP_SYS_ADMIN))
4922 return -EPERM;
4923
4924 ret = mnt_want_write_file(file);
4925 if (ret)
4926 return ret;
4927
4928 sa = memdup_user(arg, sizeof(*sa));
4929 if (IS_ERR(sa)) {
4930 ret = PTR_ERR(sa);
4931 goto drop_write;
4932 }
4933
4934 trans = btrfs_join_transaction(root);
4935 if (IS_ERR(trans)) {
4936 ret = PTR_ERR(trans);
4937 goto out;
4938 }
4939
4940 if (sa->assign) {
4941 ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst);
4942 } else {
4943 ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst);
4944 }
4945
4946 /* update qgroup status and info */
4947 err = btrfs_run_qgroups(trans);
4948 if (err < 0)
4949 btrfs_handle_fs_error(fs_info, err,
4950 "failed to update qgroup status and info");
4951 err = btrfs_end_transaction(trans);
4952 if (err && !ret)
4953 ret = err;
4954
4955 out:
4956 kfree(sa);
4957 drop_write:
4958 mnt_drop_write_file(file);
4959 return ret;
4960 }
4961
4962 static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
4963 {
4964 struct inode *inode = file_inode(file);
4965 struct btrfs_root *root = BTRFS_I(inode)->root;
4966 struct btrfs_ioctl_qgroup_create_args *sa;
4967 struct btrfs_trans_handle *trans;
4968 int ret;
4969 int err;
4970
4971 if (!capable(CAP_SYS_ADMIN))
4972 return -EPERM;
4973
4974 ret = mnt_want_write_file(file);
4975 if (ret)
4976 return ret;
4977
4978 sa = memdup_user(arg, sizeof(*sa));
4979 if (IS_ERR(sa)) {
4980 ret = PTR_ERR(sa);
4981 goto drop_write;
4982 }
4983
4984 if (!sa->qgroupid) {
4985 ret = -EINVAL;
4986 goto out;
4987 }
4988
4989 trans = btrfs_join_transaction(root);
4990 if (IS_ERR(trans)) {
4991 ret = PTR_ERR(trans);
4992 goto out;
4993 }
4994
4995 if (sa->create) {
4996 ret = btrfs_create_qgroup(trans, sa->qgroupid);
4997 } else {
4998 ret = btrfs_remove_qgroup(trans, sa->qgroupid);
4999 }
5000
5001 err = btrfs_end_transaction(trans);
5002 if (err && !ret)
5003 ret = err;
5004
5005 out:
5006 kfree(sa);
5007 drop_write:
5008 mnt_drop_write_file(file);
5009 return ret;
5010 }
5011
5012 static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
5013 {
5014 struct inode *inode = file_inode(file);
5015 struct btrfs_root *root = BTRFS_I(inode)->root;
5016 struct btrfs_ioctl_qgroup_limit_args *sa;
5017 struct btrfs_trans_handle *trans;
5018 int ret;
5019 int err;
5020 u64 qgroupid;
5021
5022 if (!capable(CAP_SYS_ADMIN))
5023 return -EPERM;
5024
5025 ret = mnt_want_write_file(file);
5026 if (ret)
5027 return ret;
5028
5029 sa = memdup_user(arg, sizeof(*sa));
5030 if (IS_ERR(sa)) {
5031 ret = PTR_ERR(sa);
5032 goto drop_write;
5033 }
5034
5035 trans = btrfs_join_transaction(root);
5036 if (IS_ERR(trans)) {
5037 ret = PTR_ERR(trans);
5038 goto out;
5039 }
5040
5041 qgroupid = sa->qgroupid;
5042 if (!qgroupid) {
5043 /* take the current subvol as qgroup */
5044 qgroupid = root->root_key.objectid;
5045 }
5046
5047 ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim);
5048
5049 err = btrfs_end_transaction(trans);
5050 if (err && !ret)
5051 ret = err;
5052
5053 out:
5054 kfree(sa);
5055 drop_write:
5056 mnt_drop_write_file(file);
5057 return ret;
5058 }
5059
5060 static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
5061 {
5062 struct inode *inode = file_inode(file);
5063 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5064 struct btrfs_ioctl_quota_rescan_args *qsa;
5065 int ret;
5066
5067 if (!capable(CAP_SYS_ADMIN))
5068 return -EPERM;
5069
5070 ret = mnt_want_write_file(file);
5071 if (ret)
5072 return ret;
5073
5074 qsa = memdup_user(arg, sizeof(*qsa));
5075 if (IS_ERR(qsa)) {
5076 ret = PTR_ERR(qsa);
5077 goto drop_write;
5078 }
5079
5080 if (qsa->flags) {
5081 ret = -EINVAL;
5082 goto out;
5083 }
5084
5085 ret = btrfs_qgroup_rescan(fs_info);
5086
5087 out:
5088 kfree(qsa);
5089 drop_write:
5090 mnt_drop_write_file(file);
5091 return ret;
5092 }
5093
5094 static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
5095 {
5096 struct inode *inode = file_inode(file);
5097 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5098 struct btrfs_ioctl_quota_rescan_args *qsa;
5099 int ret = 0;
5100
5101 if (!capable(CAP_SYS_ADMIN))
5102 return -EPERM;
5103
5104 qsa = kzalloc(sizeof(*qsa), GFP_KERNEL);
5105 if (!qsa)
5106 return -ENOMEM;
5107
5108 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
5109 qsa->flags = 1;
5110 qsa->progress = fs_info->qgroup_rescan_progress.objectid;
5111 }
5112
5113 if (copy_to_user(arg, qsa, sizeof(*qsa)))
5114 ret = -EFAULT;
5115
5116 kfree(qsa);
5117 return ret;
5118 }
5119
5120 static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
5121 {
5122 struct inode *inode = file_inode(file);
5123 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5124
5125 if (!capable(CAP_SYS_ADMIN))
5126 return -EPERM;
5127
5128 return btrfs_qgroup_wait_for_completion(fs_info, true);
5129 }
5130
5131 static long _btrfs_ioctl_set_received_subvol(struct file *file,
5132 struct btrfs_ioctl_received_subvol_args *sa)
5133 {
5134 struct inode *inode = file_inode(file);
5135 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5136 struct btrfs_root *root = BTRFS_I(inode)->root;
5137 struct btrfs_root_item *root_item = &root->root_item;
5138 struct btrfs_trans_handle *trans;
5139 struct timespec64 ct = current_time(inode);
5140 int ret = 0;
5141 int received_uuid_changed;
5142
5143 if (!inode_owner_or_capable(inode))
5144 return -EPERM;
5145
5146 ret = mnt_want_write_file(file);
5147 if (ret < 0)
5148 return ret;
5149
5150 down_write(&fs_info->subvol_sem);
5151
5152 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
5153 ret = -EINVAL;
5154 goto out;
5155 }
5156
5157 if (btrfs_root_readonly(root)) {
5158 ret = -EROFS;
5159 goto out;
5160 }
5161
5162 /*
5163 * 1 - root item
5164 * 2 - uuid items (received uuid + subvol uuid)
5165 */
5166 trans = btrfs_start_transaction(root, 3);
5167 if (IS_ERR(trans)) {
5168 ret = PTR_ERR(trans);
5169 trans = NULL;
5170 goto out;
5171 }
5172
5173 sa->rtransid = trans->transid;
5174 sa->rtime.sec = ct.tv_sec;
5175 sa->rtime.nsec = ct.tv_nsec;
5176
5177 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
5178 BTRFS_UUID_SIZE);
5179 if (received_uuid_changed &&
5180 !btrfs_is_empty_uuid(root_item->received_uuid)) {
5181 ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid,
5182 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
5183 root->root_key.objectid);
5184 if (ret && ret != -ENOENT) {
5185 btrfs_abort_transaction(trans, ret);
5186 btrfs_end_transaction(trans);
5187 goto out;
5188 }
5189 }
5190 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
5191 btrfs_set_root_stransid(root_item, sa->stransid);
5192 btrfs_set_root_rtransid(root_item, sa->rtransid);
5193 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
5194 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
5195 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
5196 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
5197
5198 ret = btrfs_update_root(trans, fs_info->tree_root,
5199 &root->root_key, &root->root_item);
5200 if (ret < 0) {
5201 btrfs_end_transaction(trans);
5202 goto out;
5203 }
5204 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
5205 ret = btrfs_uuid_tree_add(trans, sa->uuid,
5206 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
5207 root->root_key.objectid);
5208 if (ret < 0 && ret != -EEXIST) {
5209 btrfs_abort_transaction(trans, ret);
5210 btrfs_end_transaction(trans);
5211 goto out;
5212 }
5213 }
5214 ret = btrfs_commit_transaction(trans);
5215 out:
5216 up_write(&fs_info->subvol_sem);
5217 mnt_drop_write_file(file);
5218 return ret;
5219 }
5220
5221 #ifdef CONFIG_64BIT
5222 static long btrfs_ioctl_set_received_subvol_32(struct file *file,
5223 void __user *arg)
5224 {
5225 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
5226 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
5227 int ret = 0;
5228
5229 args32 = memdup_user(arg, sizeof(*args32));
5230 if (IS_ERR(args32))
5231 return PTR_ERR(args32);
5232
5233 args64 = kmalloc(sizeof(*args64), GFP_KERNEL);
5234 if (!args64) {
5235 ret = -ENOMEM;
5236 goto out;
5237 }
5238
5239 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
5240 args64->stransid = args32->stransid;
5241 args64->rtransid = args32->rtransid;
5242 args64->stime.sec = args32->stime.sec;
5243 args64->stime.nsec = args32->stime.nsec;
5244 args64->rtime.sec = args32->rtime.sec;
5245 args64->rtime.nsec = args32->rtime.nsec;
5246 args64->flags = args32->flags;
5247
5248 ret = _btrfs_ioctl_set_received_subvol(file, args64);
5249 if (ret)
5250 goto out;
5251
5252 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
5253 args32->stransid = args64->stransid;
5254 args32->rtransid = args64->rtransid;
5255 args32->stime.sec = args64->stime.sec;
5256 args32->stime.nsec = args64->stime.nsec;
5257 args32->rtime.sec = args64->rtime.sec;
5258 args32->rtime.nsec = args64->rtime.nsec;
5259 args32->flags = args64->flags;
5260
5261 ret = copy_to_user(arg, args32, sizeof(*args32));
5262 if (ret)
5263 ret = -EFAULT;
5264
5265 out:
5266 kfree(args32);
5267 kfree(args64);
5268 return ret;
5269 }
5270 #endif
5271
5272 static long btrfs_ioctl_set_received_subvol(struct file *file,
5273 void __user *arg)
5274 {
5275 struct btrfs_ioctl_received_subvol_args *sa = NULL;
5276 int ret = 0;
5277
5278 sa = memdup_user(arg, sizeof(*sa));
5279 if (IS_ERR(sa))
5280 return PTR_ERR(sa);
5281
5282 ret = _btrfs_ioctl_set_received_subvol(file, sa);
5283
5284 if (ret)
5285 goto out;
5286
5287 ret = copy_to_user(arg, sa, sizeof(*sa));
5288 if (ret)
5289 ret = -EFAULT;
5290
5291 out:
5292 kfree(sa);
5293 return ret;
5294 }
5295
5296 static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
5297 {
5298 struct inode *inode = file_inode(file);
5299 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5300 size_t len;
5301 int ret;
5302 char label[BTRFS_LABEL_SIZE];
5303
5304 spin_lock(&fs_info->super_lock);
5305 memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE);
5306 spin_unlock(&fs_info->super_lock);
5307
5308 len = strnlen(label, BTRFS_LABEL_SIZE);
5309
5310 if (len == BTRFS_LABEL_SIZE) {
5311 btrfs_warn(fs_info,
5312 "label is too long, return the first %zu bytes",
5313 --len);
5314 }
5315
5316 ret = copy_to_user(arg, label, len);
5317
5318 return ret ? -EFAULT : 0;
5319 }
5320
5321 static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
5322 {
5323 struct inode *inode = file_inode(file);
5324 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5325 struct btrfs_root *root = BTRFS_I(inode)->root;
5326 struct btrfs_super_block *super_block = fs_info->super_copy;
5327 struct btrfs_trans_handle *trans;
5328 char label[BTRFS_LABEL_SIZE];
5329 int ret;
5330
5331 if (!capable(CAP_SYS_ADMIN))
5332 return -EPERM;
5333
5334 if (copy_from_user(label, arg, sizeof(label)))
5335 return -EFAULT;
5336
5337 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
5338 btrfs_err(fs_info,
5339 "unable to set label with more than %d bytes",
5340 BTRFS_LABEL_SIZE - 1);
5341 return -EINVAL;
5342 }
5343
5344 ret = mnt_want_write_file(file);
5345 if (ret)
5346 return ret;
5347
5348 trans = btrfs_start_transaction(root, 0);
5349 if (IS_ERR(trans)) {
5350 ret = PTR_ERR(trans);
5351 goto out_unlock;
5352 }
5353
5354 spin_lock(&fs_info->super_lock);
5355 strcpy(super_block->label, label);
5356 spin_unlock(&fs_info->super_lock);
5357 ret = btrfs_commit_transaction(trans);
5358
5359 out_unlock:
5360 mnt_drop_write_file(file);
5361 return ret;
5362 }
5363
5364 #define INIT_FEATURE_FLAGS(suffix) \
5365 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
5366 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
5367 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
5368
5369 int btrfs_ioctl_get_supported_features(void __user *arg)
5370 {
5371 static const struct btrfs_ioctl_feature_flags features[3] = {
5372 INIT_FEATURE_FLAGS(SUPP),
5373 INIT_FEATURE_FLAGS(SAFE_SET),
5374 INIT_FEATURE_FLAGS(SAFE_CLEAR)
5375 };
5376
5377 if (copy_to_user(arg, &features, sizeof(features)))
5378 return -EFAULT;
5379
5380 return 0;
5381 }
5382
5383 static int btrfs_ioctl_get_features(struct file *file, void __user *arg)
5384 {
5385 struct inode *inode = file_inode(file);
5386 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5387 struct btrfs_super_block *super_block = fs_info->super_copy;
5388 struct btrfs_ioctl_feature_flags features;
5389
5390 features.compat_flags = btrfs_super_compat_flags(super_block);
5391 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
5392 features.incompat_flags = btrfs_super_incompat_flags(super_block);
5393
5394 if (copy_to_user(arg, &features, sizeof(features)))
5395 return -EFAULT;
5396
5397 return 0;
5398 }
5399
5400 static int check_feature_bits(struct btrfs_fs_info *fs_info,
5401 enum btrfs_feature_set set,
5402 u64 change_mask, u64 flags, u64 supported_flags,
5403 u64 safe_set, u64 safe_clear)
5404 {
5405 const char *type = btrfs_feature_set_names[set];
5406 char *names;
5407 u64 disallowed, unsupported;
5408 u64 set_mask = flags & change_mask;
5409 u64 clear_mask = ~flags & change_mask;
5410
5411 unsupported = set_mask & ~supported_flags;
5412 if (unsupported) {
5413 names = btrfs_printable_features(set, unsupported);
5414 if (names) {
5415 btrfs_warn(fs_info,
5416 "this kernel does not support the %s feature bit%s",
5417 names, strchr(names, ',') ? "s" : "");
5418 kfree(names);
5419 } else
5420 btrfs_warn(fs_info,
5421 "this kernel does not support %s bits 0x%llx",
5422 type, unsupported);
5423 return -EOPNOTSUPP;
5424 }
5425
5426 disallowed = set_mask & ~safe_set;
5427 if (disallowed) {
5428 names = btrfs_printable_features(set, disallowed);
5429 if (names) {
5430 btrfs_warn(fs_info,
5431 "can't set the %s feature bit%s while mounted",
5432 names, strchr(names, ',') ? "s" : "");
5433 kfree(names);
5434 } else
5435 btrfs_warn(fs_info,
5436 "can't set %s bits 0x%llx while mounted",
5437 type, disallowed);
5438 return -EPERM;
5439 }
5440
5441 disallowed = clear_mask & ~safe_clear;
5442 if (disallowed) {
5443 names = btrfs_printable_features(set, disallowed);
5444 if (names) {
5445 btrfs_warn(fs_info,
5446 "can't clear the %s feature bit%s while mounted",
5447 names, strchr(names, ',') ? "s" : "");
5448 kfree(names);
5449 } else
5450 btrfs_warn(fs_info,
5451 "can't clear %s bits 0x%llx while mounted",
5452 type, disallowed);
5453 return -EPERM;
5454 }
5455
5456 return 0;
5457 }
5458
5459 #define check_feature(fs_info, change_mask, flags, mask_base) \
5460 check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \
5461 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
5462 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
5463 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
5464
5465 static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
5466 {
5467 struct inode *inode = file_inode(file);
5468 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5469 struct btrfs_root *root = BTRFS_I(inode)->root;
5470 struct btrfs_super_block *super_block = fs_info->super_copy;
5471 struct btrfs_ioctl_feature_flags flags[2];
5472 struct btrfs_trans_handle *trans;
5473 u64 newflags;
5474 int ret;
5475
5476 if (!capable(CAP_SYS_ADMIN))
5477 return -EPERM;
5478
5479 if (copy_from_user(flags, arg, sizeof(flags)))
5480 return -EFAULT;
5481
5482 /* Nothing to do */
5483 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
5484 !flags[0].incompat_flags)
5485 return 0;
5486
5487 ret = check_feature(fs_info, flags[0].compat_flags,
5488 flags[1].compat_flags, COMPAT);
5489 if (ret)
5490 return ret;
5491
5492 ret = check_feature(fs_info, flags[0].compat_ro_flags,
5493 flags[1].compat_ro_flags, COMPAT_RO);
5494 if (ret)
5495 return ret;
5496
5497 ret = check_feature(fs_info, flags[0].incompat_flags,
5498 flags[1].incompat_flags, INCOMPAT);
5499 if (ret)
5500 return ret;
5501
5502 ret = mnt_want_write_file(file);
5503 if (ret)
5504 return ret;
5505
5506 trans = btrfs_start_transaction(root, 0);
5507 if (IS_ERR(trans)) {
5508 ret = PTR_ERR(trans);
5509 goto out_drop_write;
5510 }
5511
5512 spin_lock(&fs_info->super_lock);
5513 newflags = btrfs_super_compat_flags(super_block);
5514 newflags |= flags[0].compat_flags & flags[1].compat_flags;
5515 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
5516 btrfs_set_super_compat_flags(super_block, newflags);
5517
5518 newflags = btrfs_super_compat_ro_flags(super_block);
5519 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
5520 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
5521 btrfs_set_super_compat_ro_flags(super_block, newflags);
5522
5523 newflags = btrfs_super_incompat_flags(super_block);
5524 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
5525 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
5526 btrfs_set_super_incompat_flags(super_block, newflags);
5527 spin_unlock(&fs_info->super_lock);
5528
5529 ret = btrfs_commit_transaction(trans);
5530 out_drop_write:
5531 mnt_drop_write_file(file);
5532
5533 return ret;
5534 }
5535
5536 static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat)
5537 {
5538 struct btrfs_ioctl_send_args *arg;
5539 int ret;
5540
5541 if (compat) {
5542 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5543 struct btrfs_ioctl_send_args_32 args32;
5544
5545 ret = copy_from_user(&args32, argp, sizeof(args32));
5546 if (ret)
5547 return -EFAULT;
5548 arg = kzalloc(sizeof(*arg), GFP_KERNEL);
5549 if (!arg)
5550 return -ENOMEM;
5551 arg->send_fd = args32.send_fd;
5552 arg->clone_sources_count = args32.clone_sources_count;
5553 arg->clone_sources = compat_ptr(args32.clone_sources);
5554 arg->parent_root = args32.parent_root;
5555 arg->flags = args32.flags;
5556 memcpy(arg->reserved, args32.reserved,
5557 sizeof(args32.reserved));
5558 #else
5559 return -ENOTTY;
5560 #endif
5561 } else {
5562 arg = memdup_user(argp, sizeof(*arg));
5563 if (IS_ERR(arg))
5564 return PTR_ERR(arg);
5565 }
5566 ret = btrfs_ioctl_send(file, arg);
5567 kfree(arg);
5568 return ret;
5569 }
5570
5571 long btrfs_ioctl(struct file *file, unsigned int
5572 cmd, unsigned long arg)
5573 {
5574 struct inode *inode = file_inode(file);
5575 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5576 struct btrfs_root *root = BTRFS_I(inode)->root;
5577 void __user *argp = (void __user *)arg;
5578
5579 switch (cmd) {
5580 case FS_IOC_GETFLAGS:
5581 return btrfs_ioctl_getflags(file, argp);
5582 case FS_IOC_SETFLAGS:
5583 return btrfs_ioctl_setflags(file, argp);
5584 case FS_IOC_GETVERSION:
5585 return btrfs_ioctl_getversion(file, argp);
5586 case FITRIM:
5587 return btrfs_ioctl_fitrim(file, argp);
5588 case BTRFS_IOC_SNAP_CREATE:
5589 return btrfs_ioctl_snap_create(file, argp, 0);
5590 case BTRFS_IOC_SNAP_CREATE_V2:
5591 return btrfs_ioctl_snap_create_v2(file, argp, 0);
5592 case BTRFS_IOC_SUBVOL_CREATE:
5593 return btrfs_ioctl_snap_create(file, argp, 1);
5594 case BTRFS_IOC_SUBVOL_CREATE_V2:
5595 return btrfs_ioctl_snap_create_v2(file, argp, 1);
5596 case BTRFS_IOC_SNAP_DESTROY:
5597 return btrfs_ioctl_snap_destroy(file, argp);
5598 case BTRFS_IOC_SUBVOL_GETFLAGS:
5599 return btrfs_ioctl_subvol_getflags(file, argp);
5600 case BTRFS_IOC_SUBVOL_SETFLAGS:
5601 return btrfs_ioctl_subvol_setflags(file, argp);
5602 case BTRFS_IOC_DEFAULT_SUBVOL:
5603 return btrfs_ioctl_default_subvol(file, argp);
5604 case BTRFS_IOC_DEFRAG:
5605 return btrfs_ioctl_defrag(file, NULL);
5606 case BTRFS_IOC_DEFRAG_RANGE:
5607 return btrfs_ioctl_defrag(file, argp);
5608 case BTRFS_IOC_RESIZE:
5609 return btrfs_ioctl_resize(file, argp);
5610 case BTRFS_IOC_ADD_DEV:
5611 return btrfs_ioctl_add_dev(fs_info, argp);
5612 case BTRFS_IOC_RM_DEV:
5613 return btrfs_ioctl_rm_dev(file, argp);
5614 case BTRFS_IOC_RM_DEV_V2:
5615 return btrfs_ioctl_rm_dev_v2(file, argp);
5616 case BTRFS_IOC_FS_INFO:
5617 return btrfs_ioctl_fs_info(fs_info, argp);
5618 case BTRFS_IOC_DEV_INFO:
5619 return btrfs_ioctl_dev_info(fs_info, argp);
5620 case BTRFS_IOC_BALANCE:
5621 return btrfs_ioctl_balance(file, NULL);
5622 case BTRFS_IOC_TREE_SEARCH:
5623 return btrfs_ioctl_tree_search(file, argp);
5624 case BTRFS_IOC_TREE_SEARCH_V2:
5625 return btrfs_ioctl_tree_search_v2(file, argp);
5626 case BTRFS_IOC_INO_LOOKUP:
5627 return btrfs_ioctl_ino_lookup(file, argp);
5628 case BTRFS_IOC_INO_PATHS:
5629 return btrfs_ioctl_ino_to_path(root, argp);
5630 case BTRFS_IOC_LOGICAL_INO:
5631 return btrfs_ioctl_logical_to_ino(fs_info, argp, 1);
5632 case BTRFS_IOC_LOGICAL_INO_V2:
5633 return btrfs_ioctl_logical_to_ino(fs_info, argp, 2);
5634 case BTRFS_IOC_SPACE_INFO:
5635 return btrfs_ioctl_space_info(fs_info, argp);
5636 case BTRFS_IOC_SYNC: {
5637 int ret;
5638
5639 ret = btrfs_start_delalloc_roots(fs_info, -1);
5640 if (ret)
5641 return ret;
5642 ret = btrfs_sync_fs(inode->i_sb, 1);
5643 /*
5644 * The transaction thread may want to do more work,
5645 * namely it pokes the cleaner kthread that will start
5646 * processing uncleaned subvols.
5647 */
5648 wake_up_process(fs_info->transaction_kthread);
5649 return ret;
5650 }
5651 case BTRFS_IOC_START_SYNC:
5652 return btrfs_ioctl_start_sync(root, argp);
5653 case BTRFS_IOC_WAIT_SYNC:
5654 return btrfs_ioctl_wait_sync(fs_info, argp);
5655 case BTRFS_IOC_SCRUB:
5656 return btrfs_ioctl_scrub(file, argp);
5657 case BTRFS_IOC_SCRUB_CANCEL:
5658 return btrfs_ioctl_scrub_cancel(fs_info);
5659 case BTRFS_IOC_SCRUB_PROGRESS:
5660 return btrfs_ioctl_scrub_progress(fs_info, argp);
5661 case BTRFS_IOC_BALANCE_V2:
5662 return btrfs_ioctl_balance(file, argp);
5663 case BTRFS_IOC_BALANCE_CTL:
5664 return btrfs_ioctl_balance_ctl(fs_info, arg);
5665 case BTRFS_IOC_BALANCE_PROGRESS:
5666 return btrfs_ioctl_balance_progress(fs_info, argp);
5667 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
5668 return btrfs_ioctl_set_received_subvol(file, argp);
5669 #ifdef CONFIG_64BIT
5670 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
5671 return btrfs_ioctl_set_received_subvol_32(file, argp);
5672 #endif
5673 case BTRFS_IOC_SEND:
5674 return _btrfs_ioctl_send(file, argp, false);
5675 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5676 case BTRFS_IOC_SEND_32:
5677 return _btrfs_ioctl_send(file, argp, true);
5678 #endif
5679 case BTRFS_IOC_GET_DEV_STATS:
5680 return btrfs_ioctl_get_dev_stats(fs_info, argp);
5681 case BTRFS_IOC_QUOTA_CTL:
5682 return btrfs_ioctl_quota_ctl(file, argp);
5683 case BTRFS_IOC_QGROUP_ASSIGN:
5684 return btrfs_ioctl_qgroup_assign(file, argp);
5685 case BTRFS_IOC_QGROUP_CREATE:
5686 return btrfs_ioctl_qgroup_create(file, argp);
5687 case BTRFS_IOC_QGROUP_LIMIT:
5688 return btrfs_ioctl_qgroup_limit(file, argp);
5689 case BTRFS_IOC_QUOTA_RESCAN:
5690 return btrfs_ioctl_quota_rescan(file, argp);
5691 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
5692 return btrfs_ioctl_quota_rescan_status(file, argp);
5693 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
5694 return btrfs_ioctl_quota_rescan_wait(file, argp);
5695 case BTRFS_IOC_DEV_REPLACE:
5696 return btrfs_ioctl_dev_replace(fs_info, argp);
5697 case BTRFS_IOC_GET_FSLABEL:
5698 return btrfs_ioctl_get_fslabel(file, argp);
5699 case BTRFS_IOC_SET_FSLABEL:
5700 return btrfs_ioctl_set_fslabel(file, argp);
5701 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
5702 return btrfs_ioctl_get_supported_features(argp);
5703 case BTRFS_IOC_GET_FEATURES:
5704 return btrfs_ioctl_get_features(file, argp);
5705 case BTRFS_IOC_SET_FEATURES:
5706 return btrfs_ioctl_set_features(file, argp);
5707 case FS_IOC_FSGETXATTR:
5708 return btrfs_ioctl_fsgetxattr(file, argp);
5709 case FS_IOC_FSSETXATTR:
5710 return btrfs_ioctl_fssetxattr(file, argp);
5711 case BTRFS_IOC_GET_SUBVOL_INFO:
5712 return btrfs_ioctl_get_subvol_info(file, argp);
5713 case BTRFS_IOC_GET_SUBVOL_ROOTREF:
5714 return btrfs_ioctl_get_subvol_rootref(file, argp);
5715 case BTRFS_IOC_INO_LOOKUP_USER:
5716 return btrfs_ioctl_ino_lookup_user(file, argp);
5717 }
5718
5719 return -ENOTTY;
5720 }
5721
5722 #ifdef CONFIG_COMPAT
5723 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
5724 {
5725 /*
5726 * These all access 32-bit values anyway so no further
5727 * handling is necessary.
5728 */
5729 switch (cmd) {
5730 case FS_IOC32_GETFLAGS:
5731 cmd = FS_IOC_GETFLAGS;
5732 break;
5733 case FS_IOC32_SETFLAGS:
5734 cmd = FS_IOC_SETFLAGS;
5735 break;
5736 case FS_IOC32_GETVERSION:
5737 cmd = FS_IOC_GETVERSION;
5738 break;
5739 }
5740
5741 return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
5742 }
5743 #endif
5744
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