Line data Source code
1 : /*
2 : * Copyright (C) 2007 Oracle. All rights reserved.
3 : *
4 : * This program is free software; you can redistribute it and/or
5 : * modify it under the terms of the GNU General Public
6 : * License v2 as published by the Free Software Foundation.
7 : *
8 : * This program is distributed in the hope that it will be useful,
9 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 : * General Public License for more details.
12 : *
13 : * You should have received a copy of the GNU General Public
14 : * License along with this program; if not, write to the
15 : * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 : * Boston, MA 021110-1307, USA.
17 : */
18 :
19 : #include <linux/kernel.h>
20 : #include <linux/bio.h>
21 : #include <linux/buffer_head.h>
22 : #include <linux/file.h>
23 : #include <linux/fs.h>
24 : #include <linux/fsnotify.h>
25 : #include <linux/pagemap.h>
26 : #include <linux/highmem.h>
27 : #include <linux/time.h>
28 : #include <linux/init.h>
29 : #include <linux/string.h>
30 : #include <linux/backing-dev.h>
31 : #include <linux/mount.h>
32 : #include <linux/mpage.h>
33 : #include <linux/namei.h>
34 : #include <linux/swap.h>
35 : #include <linux/writeback.h>
36 : #include <linux/statfs.h>
37 : #include <linux/compat.h>
38 : #include <linux/bit_spinlock.h>
39 : #include <linux/security.h>
40 : #include <linux/xattr.h>
41 : #include <linux/vmalloc.h>
42 : #include <linux/slab.h>
43 : #include <linux/blkdev.h>
44 : #include <linux/uuid.h>
45 : #include <linux/btrfs.h>
46 : #include <linux/uaccess.h>
47 : #include "ctree.h"
48 : #include "disk-io.h"
49 : #include "transaction.h"
50 : #include "btrfs_inode.h"
51 : #include "print-tree.h"
52 : #include "volumes.h"
53 : #include "locking.h"
54 : #include "inode-map.h"
55 : #include "backref.h"
56 : #include "rcu-string.h"
57 : #include "send.h"
58 : #include "dev-replace.h"
59 : #include "props.h"
60 : #include "sysfs.h"
61 : #include "qgroup.h"
62 :
63 : #ifdef CONFIG_64BIT
64 : /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
65 : * structures are incorrect, as the timespec structure from userspace
66 : * is 4 bytes too small. We define these alternatives here to teach
67 : * the kernel about the 32-bit struct packing.
68 : */
69 : struct btrfs_ioctl_timespec_32 {
70 : __u64 sec;
71 : __u32 nsec;
72 : } __attribute__ ((__packed__));
73 :
74 : struct btrfs_ioctl_received_subvol_args_32 {
75 : char uuid[BTRFS_UUID_SIZE]; /* in */
76 : __u64 stransid; /* in */
77 : __u64 rtransid; /* out */
78 : struct btrfs_ioctl_timespec_32 stime; /* in */
79 : struct btrfs_ioctl_timespec_32 rtime; /* out */
80 : __u64 flags; /* in */
81 : __u64 reserved[16]; /* in */
82 : } __attribute__ ((__packed__));
83 :
84 : #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
85 : struct btrfs_ioctl_received_subvol_args_32)
86 : #endif
87 :
88 :
89 : static int btrfs_clone(struct inode *src, struct inode *inode,
90 : u64 off, u64 olen, u64 olen_aligned, u64 destoff);
91 :
92 : /* Mask out flags that are inappropriate for the given type of inode. */
93 : static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
94 : {
95 3 : if (S_ISDIR(mode))
96 : return flags;
97 3 : else if (S_ISREG(mode))
98 3 : return flags & ~FS_DIRSYNC_FL;
99 : else
100 0 : return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
101 : }
102 :
103 : /*
104 : * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
105 : */
106 235 : static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
107 : {
108 : unsigned int iflags = 0;
109 :
110 235 : if (flags & BTRFS_INODE_SYNC)
111 : iflags |= FS_SYNC_FL;
112 235 : if (flags & BTRFS_INODE_IMMUTABLE)
113 0 : iflags |= FS_IMMUTABLE_FL;
114 235 : if (flags & BTRFS_INODE_APPEND)
115 0 : iflags |= FS_APPEND_FL;
116 235 : if (flags & BTRFS_INODE_NODUMP)
117 0 : iflags |= FS_NODUMP_FL;
118 235 : if (flags & BTRFS_INODE_NOATIME)
119 0 : iflags |= FS_NOATIME_FL;
120 235 : if (flags & BTRFS_INODE_DIRSYNC)
121 0 : iflags |= FS_DIRSYNC_FL;
122 235 : if (flags & BTRFS_INODE_NODATACOW)
123 2 : iflags |= FS_NOCOW_FL;
124 :
125 235 : if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS))
126 0 : iflags |= FS_COMPR_FL;
127 235 : else if (flags & BTRFS_INODE_NOCOMPRESS)
128 0 : iflags |= FS_NOCOMP_FL;
129 :
130 235 : return iflags;
131 : }
132 :
133 : /*
134 : * Update inode->i_flags based on the btrfs internal flags.
135 : */
136 25372 : void btrfs_update_iflags(struct inode *inode)
137 : {
138 : struct btrfs_inode *ip = BTRFS_I(inode);
139 : unsigned int new_fl = 0;
140 :
141 25372 : if (ip->flags & BTRFS_INODE_SYNC)
142 : new_fl |= S_SYNC;
143 25372 : if (ip->flags & BTRFS_INODE_IMMUTABLE)
144 0 : new_fl |= S_IMMUTABLE;
145 25372 : if (ip->flags & BTRFS_INODE_APPEND)
146 0 : new_fl |= S_APPEND;
147 25372 : if (ip->flags & BTRFS_INODE_NOATIME)
148 0 : new_fl |= S_NOATIME;
149 25372 : if (ip->flags & BTRFS_INODE_DIRSYNC)
150 0 : new_fl |= S_DIRSYNC;
151 :
152 25372 : set_mask_bits(&inode->i_flags,
153 : S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC,
154 : new_fl);
155 25372 : }
156 :
157 : /*
158 : * Inherit flags from the parent inode.
159 : *
160 : * Currently only the compression flags and the cow flags are inherited.
161 : */
162 20472 : void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
163 : {
164 : unsigned int flags;
165 :
166 20472 : if (!dir)
167 20472 : return;
168 :
169 20423 : flags = BTRFS_I(dir)->flags;
170 :
171 20423 : if (flags & BTRFS_INODE_NOCOMPRESS) {
172 1 : BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
173 1 : BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
174 20422 : } else if (flags & BTRFS_INODE_COMPRESS) {
175 10 : BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
176 10 : BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
177 : }
178 :
179 20423 : if (flags & BTRFS_INODE_NODATACOW) {
180 0 : BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
181 0 : if (S_ISREG(inode->i_mode))
182 0 : BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
183 : }
184 :
185 20423 : btrfs_update_iflags(inode);
186 : }
187 :
188 232 : static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
189 : {
190 : struct btrfs_inode *ip = BTRFS_I(file_inode(file));
191 232 : unsigned int flags = btrfs_flags_to_ioctl(ip->flags);
192 :
193 232 : if (copy_to_user(arg, &flags, sizeof(flags)))
194 : return -EFAULT;
195 232 : return 0;
196 : }
197 :
198 : static int check_flags(unsigned int flags)
199 : {
200 3 : if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
201 : FS_NOATIME_FL | FS_NODUMP_FL | \
202 : FS_SYNC_FL | FS_DIRSYNC_FL | \
203 : FS_NOCOMP_FL | FS_COMPR_FL |
204 : FS_NOCOW_FL))
205 : return -EOPNOTSUPP;
206 :
207 3 : if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
208 : return -EINVAL;
209 :
210 : return 0;
211 : }
212 :
213 3 : static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
214 : {
215 : struct inode *inode = file_inode(file);
216 : struct btrfs_inode *ip = BTRFS_I(inode);
217 6 : struct btrfs_root *root = ip->root;
218 : struct btrfs_trans_handle *trans;
219 : unsigned int flags, oldflags;
220 : int ret;
221 : u64 ip_oldflags;
222 : unsigned int i_oldflags;
223 : umode_t mode;
224 :
225 3 : if (!inode_owner_or_capable(inode))
226 : return -EPERM;
227 :
228 3 : if (btrfs_root_readonly(root))
229 : return -EROFS;
230 :
231 3 : if (copy_from_user(&flags, arg, sizeof(flags)))
232 : return -EFAULT;
233 :
234 3 : ret = check_flags(flags);
235 3 : if (ret)
236 : return ret;
237 :
238 3 : ret = mnt_want_write_file(file);
239 3 : if (ret)
240 : return ret;
241 :
242 3 : mutex_lock(&inode->i_mutex);
243 :
244 3 : ip_oldflags = ip->flags;
245 3 : i_oldflags = inode->i_flags;
246 3 : mode = inode->i_mode;
247 :
248 6 : flags = btrfs_mask_flags(inode->i_mode, flags);
249 3 : oldflags = btrfs_flags_to_ioctl(ip->flags);
250 3 : if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
251 0 : if (!capable(CAP_LINUX_IMMUTABLE)) {
252 : ret = -EPERM;
253 : goto out_unlock;
254 : }
255 : }
256 :
257 3 : if (flags & FS_SYNC_FL)
258 0 : ip->flags |= BTRFS_INODE_SYNC;
259 : else
260 3 : ip->flags &= ~BTRFS_INODE_SYNC;
261 3 : if (flags & FS_IMMUTABLE_FL)
262 0 : ip->flags |= BTRFS_INODE_IMMUTABLE;
263 : else
264 3 : ip->flags &= ~BTRFS_INODE_IMMUTABLE;
265 3 : if (flags & FS_APPEND_FL)
266 0 : ip->flags |= BTRFS_INODE_APPEND;
267 : else
268 3 : ip->flags &= ~BTRFS_INODE_APPEND;
269 3 : if (flags & FS_NODUMP_FL)
270 0 : ip->flags |= BTRFS_INODE_NODUMP;
271 : else
272 3 : ip->flags &= ~BTRFS_INODE_NODUMP;
273 3 : if (flags & FS_NOATIME_FL)
274 0 : ip->flags |= BTRFS_INODE_NOATIME;
275 : else
276 3 : ip->flags &= ~BTRFS_INODE_NOATIME;
277 3 : if (flags & FS_DIRSYNC_FL)
278 0 : ip->flags |= BTRFS_INODE_DIRSYNC;
279 : else
280 3 : ip->flags &= ~BTRFS_INODE_DIRSYNC;
281 3 : if (flags & FS_NOCOW_FL) {
282 0 : if (S_ISREG(mode)) {
283 : /*
284 : * It's safe to turn csums off here, no extents exist.
285 : * Otherwise we want the flag to reflect the real COW
286 : * status of the file and will not set it.
287 : */
288 0 : if (inode->i_size == 0)
289 0 : ip->flags |= BTRFS_INODE_NODATACOW
290 : | BTRFS_INODE_NODATASUM;
291 : } else {
292 0 : ip->flags |= BTRFS_INODE_NODATACOW;
293 : }
294 : } else {
295 : /*
296 : * Revert back under same assuptions as above
297 : */
298 3 : if (S_ISREG(mode)) {
299 3 : if (inode->i_size == 0)
300 3 : ip->flags &= ~(BTRFS_INODE_NODATACOW
301 : | BTRFS_INODE_NODATASUM);
302 : } else {
303 0 : ip->flags &= ~BTRFS_INODE_NODATACOW;
304 : }
305 : }
306 :
307 : /*
308 : * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
309 : * flag may be changed automatically if compression code won't make
310 : * things smaller.
311 : */
312 3 : if (flags & FS_NOCOMP_FL) {
313 0 : ip->flags &= ~BTRFS_INODE_COMPRESS;
314 0 : ip->flags |= BTRFS_INODE_NOCOMPRESS;
315 :
316 0 : ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
317 0 : if (ret && ret != -ENODATA)
318 : goto out_drop;
319 3 : } else if (flags & FS_COMPR_FL) {
320 : const char *comp;
321 :
322 3 : ip->flags |= BTRFS_INODE_COMPRESS;
323 3 : ip->flags &= ~BTRFS_INODE_NOCOMPRESS;
324 :
325 3 : if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO)
326 : comp = "lzo";
327 : else
328 : comp = "zlib";
329 3 : ret = btrfs_set_prop(inode, "btrfs.compression",
330 : comp, strlen(comp), 0);
331 3 : if (ret)
332 : goto out_drop;
333 :
334 : } else {
335 0 : ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
336 : }
337 :
338 3 : trans = btrfs_start_transaction(root, 1);
339 3 : if (IS_ERR(trans)) {
340 0 : ret = PTR_ERR(trans);
341 0 : goto out_drop;
342 : }
343 :
344 3 : btrfs_update_iflags(inode);
345 : inode_inc_iversion(inode);
346 3 : inode->i_ctime = CURRENT_TIME;
347 3 : ret = btrfs_update_inode(trans, root, inode);
348 :
349 3 : btrfs_end_transaction(trans, root);
350 : out_drop:
351 3 : if (ret) {
352 0 : ip->flags = ip_oldflags;
353 0 : inode->i_flags = i_oldflags;
354 : }
355 :
356 : out_unlock:
357 3 : mutex_unlock(&inode->i_mutex);
358 3 : mnt_drop_write_file(file);
359 3 : return ret;
360 : }
361 :
362 : static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
363 : {
364 : struct inode *inode = file_inode(file);
365 :
366 0 : return put_user(inode->i_generation, arg);
367 : }
368 :
369 0 : static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
370 : {
371 0 : struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
372 : struct btrfs_device *device;
373 : struct request_queue *q;
374 : struct fstrim_range range;
375 : u64 minlen = ULLONG_MAX;
376 : u64 num_devices = 0;
377 0 : u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
378 : int ret;
379 :
380 0 : if (!capable(CAP_SYS_ADMIN))
381 : return -EPERM;
382 :
383 : rcu_read_lock();
384 0 : list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
385 : dev_list) {
386 0 : if (!device->bdev)
387 0 : continue;
388 : q = bdev_get_queue(device->bdev);
389 0 : if (blk_queue_discard(q)) {
390 0 : num_devices++;
391 0 : minlen = min((u64)q->limits.discard_granularity,
392 : minlen);
393 : }
394 : }
395 : rcu_read_unlock();
396 :
397 0 : if (!num_devices)
398 : return -EOPNOTSUPP;
399 0 : if (copy_from_user(&range, arg, sizeof(range)))
400 : return -EFAULT;
401 0 : if (range.start > total_bytes ||
402 0 : range.len < fs_info->sb->s_blocksize)
403 : return -EINVAL;
404 :
405 0 : range.len = min(range.len, total_bytes - range.start);
406 0 : range.minlen = max(range.minlen, minlen);
407 0 : ret = btrfs_trim_fs(fs_info->tree_root, &range);
408 0 : if (ret < 0)
409 : return ret;
410 :
411 0 : if (copy_to_user(arg, &range, sizeof(range)))
412 : return -EFAULT;
413 :
414 0 : return 0;
415 : }
416 :
417 346 : int btrfs_is_empty_uuid(u8 *uuid)
418 : {
419 : int i;
420 :
421 7946 : for (i = 0; i < BTRFS_UUID_SIZE; i++) {
422 7636 : if (uuid[i])
423 : return 0;
424 : }
425 : return 1;
426 : }
427 :
428 49 : static noinline int create_subvol(struct inode *dir,
429 : struct dentry *dentry,
430 : char *name, int namelen,
431 : u64 *async_transid,
432 : struct btrfs_qgroup_inherit *inherit)
433 : {
434 : struct btrfs_trans_handle *trans;
435 : struct btrfs_key key;
436 : struct btrfs_root_item root_item;
437 : struct btrfs_inode_item *inode_item;
438 147 : struct extent_buffer *leaf;
439 49 : struct btrfs_root *root = BTRFS_I(dir)->root;
440 : struct btrfs_root *new_root;
441 : struct btrfs_block_rsv block_rsv;
442 49 : struct timespec cur_time = CURRENT_TIME;
443 : struct inode *inode;
444 : int ret;
445 : int err;
446 : u64 objectid;
447 : u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
448 49 : u64 index = 0;
449 : u64 qgroup_reserved;
450 : uuid_le new_uuid;
451 :
452 49 : ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
453 49 : if (ret)
454 : return ret;
455 :
456 49 : btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
457 : /*
458 : * The same as the snapshot creation, please see the comment
459 : * of create_snapshot().
460 : */
461 49 : ret = btrfs_subvolume_reserve_metadata(root, &block_rsv,
462 : 8, &qgroup_reserved, false);
463 49 : if (ret)
464 : return ret;
465 :
466 49 : trans = btrfs_start_transaction(root, 0);
467 49 : if (IS_ERR(trans)) {
468 0 : ret = PTR_ERR(trans);
469 0 : btrfs_subvolume_release_metadata(root, &block_rsv,
470 : qgroup_reserved);
471 0 : return ret;
472 : }
473 49 : trans->block_rsv = &block_rsv;
474 49 : trans->bytes_reserved = block_rsv.size;
475 :
476 49 : ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit);
477 49 : if (ret)
478 : goto fail;
479 :
480 49 : leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
481 : 0, objectid, NULL, 0, 0, 0);
482 49 : if (IS_ERR(leaf)) {
483 0 : ret = PTR_ERR(leaf);
484 0 : goto fail;
485 : }
486 :
487 49 : memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
488 49 : btrfs_set_header_bytenr(leaf, leaf->start);
489 49 : btrfs_set_header_generation(leaf, trans->transid);
490 : btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
491 49 : btrfs_set_header_owner(leaf, objectid);
492 :
493 49 : write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(),
494 : BTRFS_FSID_SIZE);
495 49 : write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
496 : btrfs_header_chunk_tree_uuid(leaf),
497 : BTRFS_UUID_SIZE);
498 49 : btrfs_mark_buffer_dirty(leaf);
499 :
500 49 : memset(&root_item, 0, sizeof(root_item));
501 :
502 : inode_item = &root_item.inode;
503 : btrfs_set_stack_inode_generation(inode_item, 1);
504 : btrfs_set_stack_inode_size(inode_item, 3);
505 : btrfs_set_stack_inode_nlink(inode_item, 1);
506 49 : btrfs_set_stack_inode_nbytes(inode_item, root->leafsize);
507 : btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
508 :
509 : btrfs_set_root_flags(&root_item, 0);
510 : btrfs_set_root_limit(&root_item, 0);
511 : btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
512 :
513 49 : btrfs_set_root_bytenr(&root_item, leaf->start);
514 49 : btrfs_set_root_generation(&root_item, trans->transid);
515 : btrfs_set_root_level(&root_item, 0);
516 : btrfs_set_root_refs(&root_item, 1);
517 49 : btrfs_set_root_used(&root_item, leaf->len);
518 : btrfs_set_root_last_snapshot(&root_item, 0);
519 :
520 : btrfs_set_root_generation_v2(&root_item,
521 : btrfs_root_generation(&root_item));
522 49 : uuid_le_gen(&new_uuid);
523 49 : memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE);
524 49 : btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec);
525 49 : btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec);
526 49 : root_item.ctime = root_item.otime;
527 49 : btrfs_set_root_ctransid(&root_item, trans->transid);
528 49 : btrfs_set_root_otransid(&root_item, trans->transid);
529 :
530 49 : btrfs_tree_unlock(leaf);
531 49 : free_extent_buffer(leaf);
532 : leaf = NULL;
533 :
534 : btrfs_set_root_dirid(&root_item, new_dirid);
535 :
536 49 : key.objectid = objectid;
537 49 : key.offset = 0;
538 : btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
539 49 : ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
540 : &root_item);
541 49 : if (ret)
542 : goto fail;
543 :
544 49 : key.offset = (u64)-1;
545 49 : new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
546 49 : if (IS_ERR(new_root)) {
547 0 : btrfs_abort_transaction(trans, root, PTR_ERR(new_root));
548 : ret = PTR_ERR(new_root);
549 0 : goto fail;
550 : }
551 :
552 49 : btrfs_record_root_in_trans(trans, new_root);
553 :
554 49 : ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid);
555 49 : if (ret) {
556 : /* We potentially lose an unused inode item here */
557 0 : btrfs_abort_transaction(trans, root, ret);
558 0 : goto fail;
559 : }
560 :
561 : /*
562 : * insert the directory item
563 : */
564 49 : ret = btrfs_set_inode_index(dir, &index);
565 49 : if (ret) {
566 0 : btrfs_abort_transaction(trans, root, ret);
567 0 : goto fail;
568 : }
569 :
570 49 : ret = btrfs_insert_dir_item(trans, root,
571 : name, namelen, dir, &key,
572 : BTRFS_FT_DIR, index);
573 49 : if (ret) {
574 0 : btrfs_abort_transaction(trans, root, ret);
575 0 : goto fail;
576 : }
577 :
578 49 : btrfs_i_size_write(dir, dir->i_size + namelen * 2);
579 49 : ret = btrfs_update_inode(trans, root, dir);
580 49 : BUG_ON(ret);
581 :
582 98 : ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
583 : objectid, root->root_key.objectid,
584 : btrfs_ino(dir), index, name, namelen);
585 49 : BUG_ON(ret);
586 :
587 49 : ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
588 : root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
589 : objectid);
590 49 : if (ret)
591 0 : btrfs_abort_transaction(trans, root, ret);
592 :
593 : fail:
594 49 : trans->block_rsv = NULL;
595 49 : trans->bytes_reserved = 0;
596 49 : btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
597 :
598 49 : if (async_transid) {
599 0 : *async_transid = trans->transid;
600 0 : err = btrfs_commit_transaction_async(trans, root, 1);
601 0 : if (err)
602 0 : err = btrfs_commit_transaction(trans, root);
603 : } else {
604 49 : err = btrfs_commit_transaction(trans, root);
605 : }
606 49 : if (err && !ret)
607 : ret = err;
608 :
609 49 : if (!ret) {
610 49 : inode = btrfs_lookup_dentry(dir, dentry);
611 49 : if (IS_ERR(inode))
612 0 : return PTR_ERR(inode);
613 49 : d_instantiate(dentry, inode);
614 : }
615 49 : return ret;
616 : }
617 :
618 146 : static void btrfs_wait_nocow_write(struct btrfs_root *root)
619 : {
620 : s64 writers;
621 292 : DEFINE_WAIT(wait);
622 :
623 : do {
624 146 : prepare_to_wait(&root->subv_writers->wait, &wait,
625 : TASK_UNINTERRUPTIBLE);
626 :
627 146 : writers = percpu_counter_sum(&root->subv_writers->counter);
628 146 : if (writers)
629 0 : schedule();
630 :
631 146 : finish_wait(&root->subv_writers->wait, &wait);
632 146 : } while (writers);
633 146 : }
634 :
635 146 : static int create_snapshot(struct btrfs_root *root, struct inode *dir,
636 : struct dentry *dentry, char *name, int namelen,
637 : u64 *async_transid, bool readonly,
638 : struct btrfs_qgroup_inherit *inherit)
639 : {
640 : struct inode *inode;
641 : struct btrfs_pending_snapshot *pending_snapshot;
642 : struct btrfs_trans_handle *trans;
643 : int ret;
644 :
645 146 : if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
646 : return -EINVAL;
647 :
648 146 : atomic_inc(&root->will_be_snapshoted);
649 146 : smp_mb__after_atomic();
650 146 : btrfs_wait_nocow_write(root);
651 :
652 146 : ret = btrfs_start_delalloc_inodes(root, 0);
653 146 : if (ret)
654 : goto out;
655 :
656 146 : btrfs_wait_ordered_extents(root, -1);
657 :
658 146 : pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
659 146 : if (!pending_snapshot) {
660 : ret = -ENOMEM;
661 : goto out;
662 : }
663 :
664 146 : btrfs_init_block_rsv(&pending_snapshot->block_rsv,
665 : BTRFS_BLOCK_RSV_TEMP);
666 : /*
667 : * 1 - parent dir inode
668 : * 2 - dir entries
669 : * 1 - root item
670 : * 2 - root ref/backref
671 : * 1 - root of snapshot
672 : * 1 - UUID item
673 : */
674 146 : ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
675 : &pending_snapshot->block_rsv, 8,
676 : &pending_snapshot->qgroup_reserved,
677 : false);
678 146 : if (ret)
679 : goto free;
680 :
681 146 : pending_snapshot->dentry = dentry;
682 146 : pending_snapshot->root = root;
683 146 : pending_snapshot->readonly = readonly;
684 146 : pending_snapshot->dir = dir;
685 146 : pending_snapshot->inherit = inherit;
686 :
687 146 : trans = btrfs_start_transaction(root, 0);
688 146 : if (IS_ERR(trans)) {
689 0 : ret = PTR_ERR(trans);
690 : goto fail;
691 : }
692 :
693 146 : spin_lock(&root->fs_info->trans_lock);
694 146 : list_add(&pending_snapshot->list,
695 146 : &trans->transaction->pending_snapshots);
696 146 : spin_unlock(&root->fs_info->trans_lock);
697 146 : if (async_transid) {
698 0 : *async_transid = trans->transid;
699 0 : ret = btrfs_commit_transaction_async(trans,
700 0 : root->fs_info->extent_root, 1);
701 0 : if (ret)
702 0 : ret = btrfs_commit_transaction(trans, root);
703 : } else {
704 146 : ret = btrfs_commit_transaction(trans,
705 146 : root->fs_info->extent_root);
706 : }
707 146 : if (ret)
708 : goto fail;
709 :
710 146 : ret = pending_snapshot->error;
711 146 : if (ret)
712 : goto fail;
713 :
714 146 : inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
715 146 : if (IS_ERR(inode)) {
716 0 : ret = PTR_ERR(inode);
717 : goto fail;
718 : }
719 :
720 146 : d_instantiate(dentry, inode);
721 : ret = 0;
722 : fail:
723 146 : btrfs_subvolume_release_metadata(BTRFS_I(dir)->root,
724 : &pending_snapshot->block_rsv,
725 : pending_snapshot->qgroup_reserved);
726 : free:
727 146 : kfree(pending_snapshot);
728 : out:
729 : atomic_dec(&root->will_be_snapshoted);
730 : return ret;
731 : }
732 :
733 : /* copy of check_sticky in fs/namei.c()
734 : * It's inline, so penalty for filesystems that don't use sticky bit is
735 : * minimal.
736 : */
737 34 : static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode)
738 : {
739 34 : kuid_t fsuid = current_fsuid();
740 :
741 34 : if (!(dir->i_mode & S_ISVTX))
742 : return 0;
743 0 : if (uid_eq(inode->i_uid, fsuid))
744 : return 0;
745 0 : if (uid_eq(dir->i_uid, fsuid))
746 : return 0;
747 0 : return !capable(CAP_FOWNER);
748 : }
749 :
750 : /* copy of may_delete in fs/namei.c()
751 : * Check whether we can remove a link victim from directory dir, check
752 : * whether the type of victim is right.
753 : * 1. We can't do it if dir is read-only (done in permission())
754 : * 2. We should have write and exec permissions on dir
755 : * 3. We can't remove anything from append-only dir
756 : * 4. We can't do anything with immutable dir (done in permission())
757 : * 5. If the sticky bit on dir is set we should either
758 : * a. be owner of dir, or
759 : * b. be owner of victim, or
760 : * c. have CAP_FOWNER capability
761 : * 6. If the victim is append-only or immutable we can't do antyhing with
762 : * links pointing to it.
763 : * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
764 : * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
765 : * 9. We can't remove a root or mountpoint.
766 : * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
767 : * nfs_async_unlink().
768 : */
769 :
770 34 : static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
771 : {
772 : int error;
773 :
774 34 : if (!victim->d_inode)
775 : return -ENOENT;
776 :
777 34 : BUG_ON(victim->d_parent->d_inode != dir);
778 34 : audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
779 :
780 34 : error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
781 34 : if (error)
782 : return error;
783 34 : if (IS_APPEND(dir))
784 : return -EPERM;
785 34 : if (btrfs_check_sticky(dir, victim->d_inode)||
786 34 : IS_APPEND(victim->d_inode)||
787 34 : IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode))
788 : return -EPERM;
789 34 : if (isdir) {
790 34 : if (!S_ISDIR(victim->d_inode->i_mode))
791 : return -ENOTDIR;
792 34 : if (IS_ROOT(victim))
793 : return -EBUSY;
794 0 : } else if (S_ISDIR(victim->d_inode->i_mode))
795 : return -EISDIR;
796 34 : if (IS_DEADDIR(dir))
797 : return -ENOENT;
798 34 : if (victim->d_flags & DCACHE_NFSFS_RENAMED)
799 : return -EBUSY;
800 34 : return 0;
801 : }
802 :
803 : /* copy of may_create in fs/namei.c() */
804 195 : static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
805 : {
806 195 : if (child->d_inode)
807 : return -EEXIST;
808 195 : if (IS_DEADDIR(dir))
809 : return -ENOENT;
810 195 : return inode_permission(dir, MAY_WRITE | MAY_EXEC);
811 : }
812 :
813 : /*
814 : * Create a new subvolume below @parent. This is largely modeled after
815 : * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
816 : * inside this filesystem so it's quite a bit simpler.
817 : */
818 195 : static noinline int btrfs_mksubvol(struct path *parent,
819 : char *name, int namelen,
820 : struct btrfs_root *snap_src,
821 : u64 *async_transid, bool readonly,
822 : struct btrfs_qgroup_inherit *inherit)
823 : {
824 195 : struct inode *dir = parent->dentry->d_inode;
825 : struct dentry *dentry;
826 : int error;
827 :
828 195 : error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
829 195 : if (error == -EINTR)
830 : return error;
831 :
832 195 : dentry = lookup_one_len(name, parent->dentry, namelen);
833 195 : error = PTR_ERR(dentry);
834 195 : if (IS_ERR(dentry))
835 : goto out_unlock;
836 :
837 : error = -EEXIST;
838 195 : if (dentry->d_inode)
839 : goto out_dput;
840 :
841 195 : error = btrfs_may_create(dir, dentry);
842 195 : if (error)
843 : goto out_dput;
844 :
845 : /*
846 : * even if this name doesn't exist, we may get hash collisions.
847 : * check for them now when we can safely fail
848 : */
849 195 : error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
850 195 : dir->i_ino, name,
851 : namelen);
852 195 : if (error)
853 : goto out_dput;
854 :
855 195 : down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
856 :
857 390 : if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
858 : goto out_up_read;
859 :
860 195 : if (snap_src) {
861 146 : error = create_snapshot(snap_src, dir, dentry, name, namelen,
862 : async_transid, readonly, inherit);
863 : } else {
864 49 : error = create_subvol(dir, dentry, name, namelen,
865 : async_transid, inherit);
866 : }
867 195 : if (!error)
868 195 : fsnotify_mkdir(dir, dentry);
869 : out_up_read:
870 195 : up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
871 : out_dput:
872 195 : dput(dentry);
873 : out_unlock:
874 195 : mutex_unlock(&dir->i_mutex);
875 : return error;
876 : }
877 :
878 : /*
879 : * When we're defragging a range, we don't want to kick it off again
880 : * if it is really just waiting for delalloc to send it down.
881 : * If we find a nice big extent or delalloc range for the bytes in the
882 : * file you want to defrag, we return 0 to let you know to skip this
883 : * part of the file
884 : */
885 0 : static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh)
886 : {
887 0 : struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
888 0 : struct extent_map *em = NULL;
889 0 : struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
890 : u64 end;
891 :
892 0 : read_lock(&em_tree->lock);
893 0 : em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
894 : read_unlock(&em_tree->lock);
895 :
896 0 : if (em) {
897 : end = extent_map_end(em);
898 0 : free_extent_map(em);
899 0 : if (end - offset > thresh)
900 : return 0;
901 : }
902 : /* if we already have a nice delalloc here, just stop */
903 0 : thresh /= 2;
904 0 : end = count_range_bits(io_tree, &offset, offset + thresh,
905 : thresh, EXTENT_DELALLOC, 1);
906 0 : if (end >= thresh)
907 : return 0;
908 0 : return 1;
909 : }
910 :
911 : /*
912 : * helper function to walk through a file and find extents
913 : * newer than a specific transid, and smaller than thresh.
914 : *
915 : * This is used by the defragging code to find new and small
916 : * extents
917 : */
918 0 : static int find_new_extents(struct btrfs_root *root,
919 : struct inode *inode, u64 newer_than,
920 : u64 *off, int thresh)
921 : {
922 : struct btrfs_path *path;
923 : struct btrfs_key min_key;
924 0 : struct extent_buffer *leaf;
925 : struct btrfs_file_extent_item *extent;
926 : int type;
927 : int ret;
928 : u64 ino = btrfs_ino(inode);
929 :
930 0 : path = btrfs_alloc_path();
931 0 : if (!path)
932 : return -ENOMEM;
933 :
934 0 : min_key.objectid = ino;
935 0 : min_key.type = BTRFS_EXTENT_DATA_KEY;
936 0 : min_key.offset = *off;
937 :
938 : while (1) {
939 0 : path->keep_locks = 1;
940 0 : ret = btrfs_search_forward(root, &min_key, path, newer_than);
941 0 : if (ret != 0)
942 : goto none;
943 0 : path->keep_locks = 0;
944 0 : btrfs_unlock_up_safe(path, 1);
945 : process_slot:
946 0 : if (min_key.objectid != ino)
947 : goto none;
948 0 : if (min_key.type != BTRFS_EXTENT_DATA_KEY)
949 : goto none;
950 :
951 0 : leaf = path->nodes[0];
952 0 : extent = btrfs_item_ptr(leaf, path->slots[0],
953 : struct btrfs_file_extent_item);
954 :
955 : type = btrfs_file_extent_type(leaf, extent);
956 0 : if (type == BTRFS_FILE_EXTENT_REG &&
957 0 : btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
958 0 : check_defrag_in_cache(inode, min_key.offset, thresh)) {
959 0 : *off = min_key.offset;
960 0 : btrfs_free_path(path);
961 0 : return 0;
962 : }
963 :
964 0 : path->slots[0]++;
965 0 : if (path->slots[0] < btrfs_header_nritems(leaf)) {
966 0 : btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]);
967 0 : goto process_slot;
968 : }
969 :
970 0 : if (min_key.offset == (u64)-1)
971 : goto none;
972 :
973 0 : min_key.offset++;
974 0 : btrfs_release_path(path);
975 0 : }
976 : none:
977 0 : btrfs_free_path(path);
978 0 : return -ENOENT;
979 : }
980 :
981 2668 : static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
982 : {
983 2668 : struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
984 2668 : struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
985 : struct extent_map *em;
986 : u64 len = PAGE_CACHE_SIZE;
987 :
988 : /*
989 : * hopefully we have this extent in the tree already, try without
990 : * the full extent lock
991 : */
992 2668 : read_lock(&em_tree->lock);
993 2668 : em = lookup_extent_mapping(em_tree, start, len);
994 : read_unlock(&em_tree->lock);
995 :
996 2668 : if (!em) {
997 1071 : struct extent_state *cached = NULL;
998 1071 : u64 end = start + len - 1;
999 :
1000 : /* get the big lock and read metadata off disk */
1001 1071 : lock_extent_bits(io_tree, start, end, 0, &cached);
1002 1071 : em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
1003 1071 : unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS);
1004 :
1005 1071 : if (IS_ERR(em))
1006 0 : return NULL;
1007 : }
1008 :
1009 2668 : return em;
1010 : }
1011 :
1012 2676 : static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
1013 : {
1014 : struct extent_map *next;
1015 : bool ret = true;
1016 :
1017 : /* this is the last extent */
1018 2676 : if (em->start + em->len >= i_size_read(inode))
1019 : return false;
1020 :
1021 1278 : next = defrag_lookup_extent(inode, em->start + em->len);
1022 1278 : if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
1023 : ret = false;
1024 1278 : else if ((em->block_start + em->block_len == next->block_start) &&
1025 0 : (em->block_len > 128 * 1024 && next->block_len > 128 * 1024))
1026 : ret = false;
1027 :
1028 1278 : free_extent_map(next);
1029 1278 : return ret;
1030 : }
1031 :
1032 1390 : static int should_defrag_range(struct inode *inode, u64 start, int thresh,
1033 : u64 *last_len, u64 *skip, u64 *defrag_end,
1034 : int compress)
1035 : {
1036 1390 : struct extent_map *em;
1037 : int ret = 1;
1038 : bool next_mergeable = true;
1039 :
1040 : /*
1041 : * make sure that once we start defragging an extent, we keep on
1042 : * defragging it
1043 : */
1044 1390 : if (start < *defrag_end)
1045 : return 1;
1046 :
1047 1390 : *skip = 0;
1048 :
1049 1390 : em = defrag_lookup_extent(inode, start);
1050 1390 : if (!em)
1051 : return 0;
1052 :
1053 : /* this will cover holes, and inline extents */
1054 1390 : if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
1055 : ret = 0;
1056 : goto out;
1057 : }
1058 :
1059 1338 : next_mergeable = defrag_check_next_extent(inode, em);
1060 : /*
1061 : * we hit a real extent, if it is big or the next extent is not a
1062 : * real extent, don't bother defragging it
1063 : */
1064 1456 : if (!compress && (*last_len == 0 || *last_len >= thresh) &&
1065 236 : (em->len >= thresh || !next_mergeable))
1066 : ret = 0;
1067 : out:
1068 : /*
1069 : * last_len ends up being a counter of how many bytes we've defragged.
1070 : * every time we choose not to defrag an extent, we reset *last_len
1071 : * so that the next tiny extent will force a defrag.
1072 : *
1073 : * The end result of this is that tiny extents before a single big
1074 : * extent will force at least part of that big extent to be defragged.
1075 : */
1076 1390 : if (ret) {
1077 1337 : *defrag_end = extent_map_end(em);
1078 : } else {
1079 53 : *last_len = 0;
1080 53 : *skip = extent_map_end(em);
1081 53 : *defrag_end = 0;
1082 : }
1083 :
1084 1390 : free_extent_map(em);
1085 1390 : return ret;
1086 : }
1087 :
1088 : /*
1089 : * it doesn't do much good to defrag one or two pages
1090 : * at a time. This pulls in a nice chunk of pages
1091 : * to COW and defrag.
1092 : *
1093 : * It also makes sure the delalloc code has enough
1094 : * dirty data to avoid making new small extents as part
1095 : * of the defrag
1096 : *
1097 : * It's a good idea to start RA on this range
1098 : * before calling this.
1099 : */
1100 1337 : static int cluster_pages_for_defrag(struct inode *inode,
1101 : struct page **pages,
1102 : unsigned long start_index,
1103 : unsigned long num_pages)
1104 : {
1105 : unsigned long file_end;
1106 1337 : u64 isize = i_size_read(inode);
1107 : u64 page_start;
1108 : u64 page_end;
1109 : u64 page_cnt;
1110 : int ret;
1111 : int i;
1112 : int i_done;
1113 : struct btrfs_ordered_extent *ordered;
1114 1337 : struct extent_state *cached_state = NULL;
1115 : struct extent_io_tree *tree;
1116 1337 : gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
1117 :
1118 1337 : file_end = (isize - 1) >> PAGE_CACHE_SHIFT;
1119 1337 : if (!isize || start_index > file_end)
1120 : return 0;
1121 :
1122 1337 : page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
1123 :
1124 1337 : ret = btrfs_delalloc_reserve_space(inode,
1125 : page_cnt << PAGE_CACHE_SHIFT);
1126 1337 : if (ret)
1127 : return ret;
1128 : i_done = 0;
1129 1337 : tree = &BTRFS_I(inode)->io_tree;
1130 :
1131 : /* step one, lock all the pages */
1132 2773 : for (i = 0; i < page_cnt; i++) {
1133 1436 : struct page *page;
1134 : again:
1135 1436 : page = find_or_create_page(inode->i_mapping,
1136 : start_index + i, mask);
1137 1436 : if (!page)
1138 : break;
1139 :
1140 1436 : page_start = page_offset(page);
1141 1436 : page_end = page_start + PAGE_CACHE_SIZE - 1;
1142 : while (1) {
1143 1436 : lock_extent_bits(tree, page_start, page_end,
1144 : 0, &cached_state);
1145 1436 : ordered = btrfs_lookup_ordered_extent(inode,
1146 : page_start);
1147 1436 : unlock_extent_cached(tree, page_start, page_end,
1148 : &cached_state, GFP_NOFS);
1149 1436 : if (!ordered)
1150 : break;
1151 :
1152 0 : unlock_page(page);
1153 0 : btrfs_start_ordered_extent(inode, ordered, 1);
1154 0 : btrfs_put_ordered_extent(ordered);
1155 0 : lock_page(page);
1156 : /*
1157 : * we unlocked the page above, so we need check if
1158 : * it was released or not.
1159 : */
1160 0 : if (page->mapping != inode->i_mapping) {
1161 0 : unlock_page(page);
1162 0 : page_cache_release(page);
1163 0 : goto again;
1164 : }
1165 : }
1166 :
1167 1436 : if (!PageUptodate(page)) {
1168 969 : btrfs_readpage(NULL, page);
1169 969 : lock_page(page);
1170 969 : if (!PageUptodate(page)) {
1171 0 : unlock_page(page);
1172 0 : page_cache_release(page);
1173 : ret = -EIO;
1174 0 : break;
1175 : }
1176 : }
1177 :
1178 1436 : if (page->mapping != inode->i_mapping) {
1179 0 : unlock_page(page);
1180 0 : page_cache_release(page);
1181 0 : goto again;
1182 : }
1183 :
1184 1436 : pages[i] = page;
1185 1436 : i_done++;
1186 : }
1187 1337 : if (!i_done || ret)
1188 : goto out;
1189 :
1190 1337 : if (!(inode->i_sb->s_flags & MS_ACTIVE))
1191 : goto out;
1192 :
1193 : /*
1194 : * so now we have a nice long stream of locked
1195 : * and up to date pages, lets wait on them
1196 : */
1197 1436 : for (i = 0; i < i_done; i++)
1198 1436 : wait_on_page_writeback(pages[i]);
1199 :
1200 2674 : page_start = page_offset(pages[0]);
1201 2674 : page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE;
1202 :
1203 1337 : lock_extent_bits(&BTRFS_I(inode)->io_tree,
1204 : page_start, page_end - 1, 0, &cached_state);
1205 1337 : clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1206 : page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
1207 : EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
1208 : &cached_state, GFP_NOFS);
1209 :
1210 1337 : if (i_done != page_cnt) {
1211 : spin_lock(&BTRFS_I(inode)->lock);
1212 0 : BTRFS_I(inode)->outstanding_extents++;
1213 : spin_unlock(&BTRFS_I(inode)->lock);
1214 0 : btrfs_delalloc_release_space(inode,
1215 0 : (page_cnt - i_done) << PAGE_CACHE_SHIFT);
1216 : }
1217 :
1218 :
1219 1337 : set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1220 : &cached_state, GFP_NOFS);
1221 :
1222 1337 : unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1223 : page_start, page_end - 1, &cached_state,
1224 : GFP_NOFS);
1225 :
1226 2773 : for (i = 0; i < i_done; i++) {
1227 1436 : clear_page_dirty_for_io(pages[i]);
1228 1436 : ClearPageChecked(pages[i]);
1229 1436 : set_page_extent_mapped(pages[i]);
1230 1436 : set_page_dirty(pages[i]);
1231 1436 : unlock_page(pages[i]);
1232 1436 : page_cache_release(pages[i]);
1233 : }
1234 : return i_done;
1235 : out:
1236 0 : for (i = 0; i < i_done; i++) {
1237 0 : unlock_page(pages[i]);
1238 0 : page_cache_release(pages[i]);
1239 : }
1240 0 : btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT);
1241 0 : return ret;
1242 :
1243 : }
1244 :
1245 1718 : int btrfs_defrag_file(struct inode *inode, struct file *file,
1246 : struct btrfs_ioctl_defrag_range_args *range,
1247 : u64 newer_than, unsigned long max_to_defrag)
1248 : {
1249 164 : struct btrfs_root *root = BTRFS_I(inode)->root;
1250 : struct file_ra_state *ra = NULL;
1251 : unsigned long last_index;
1252 164 : u64 isize = i_size_read(inode);
1253 164 : u64 last_len = 0;
1254 164 : u64 skip = 0;
1255 164 : u64 defrag_end = 0;
1256 164 : u64 newer_off = range->start;
1257 : unsigned long i;
1258 : unsigned long ra_index = 0;
1259 : int ret;
1260 : int defrag_count = 0;
1261 : int compress_type = BTRFS_COMPRESS_ZLIB;
1262 164 : int extent_thresh = range->extent_thresh;
1263 : unsigned long max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT;
1264 : unsigned long cluster = max_cluster;
1265 : u64 new_align = ~((u64)128 * 1024 - 1);
1266 : struct page **pages = NULL;
1267 :
1268 164 : if (isize == 0)
1269 : return 0;
1270 :
1271 63 : if (range->start >= isize)
1272 : return -EINVAL;
1273 :
1274 63 : if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1275 1 : if (range->compress_type > BTRFS_COMPRESS_TYPES)
1276 : return -EINVAL;
1277 1 : if (range->compress_type)
1278 1 : compress_type = range->compress_type;
1279 : }
1280 :
1281 63 : if (extent_thresh == 0)
1282 : extent_thresh = 256 * 1024;
1283 :
1284 : /*
1285 : * if we were not given a file, allocate a readahead
1286 : * context
1287 : */
1288 63 : if (!file) {
1289 0 : ra = kzalloc(sizeof(*ra), GFP_NOFS);
1290 0 : if (!ra)
1291 : return -ENOMEM;
1292 0 : file_ra_state_init(ra, inode->i_mapping);
1293 : } else {
1294 63 : ra = &file->f_ra;
1295 : }
1296 :
1297 : pages = kmalloc_array(max_cluster, sizeof(struct page *),
1298 : GFP_NOFS);
1299 63 : if (!pages) {
1300 : ret = -ENOMEM;
1301 : goto out_ra;
1302 : }
1303 :
1304 : /* find the last page to defrag */
1305 63 : if (range->start + range->len > range->start) {
1306 63 : last_index = min_t(u64, isize - 1,
1307 : range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
1308 : } else {
1309 0 : last_index = (isize - 1) >> PAGE_CACHE_SHIFT;
1310 : }
1311 :
1312 63 : if (newer_than) {
1313 0 : ret = find_new_extents(root, inode, newer_than,
1314 : &newer_off, 64 * 1024);
1315 0 : if (!ret) {
1316 0 : range->start = newer_off;
1317 : /*
1318 : * we always align our defrag to help keep
1319 : * the extents in the file evenly spaced
1320 : */
1321 0 : i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
1322 : } else
1323 : goto out_ra;
1324 : } else {
1325 63 : i = range->start >> PAGE_CACHE_SHIFT;
1326 : }
1327 63 : if (!max_to_defrag)
1328 63 : max_to_defrag = last_index + 1;
1329 :
1330 : /*
1331 : * make writeback starts from i, so the defrag range can be
1332 : * written sequentially.
1333 : */
1334 63 : if (i < inode->i_mapping->writeback_index)
1335 6 : inode->i_mapping->writeback_index = i;
1336 :
1337 2843 : while (i <= last_index && defrag_count < max_to_defrag &&
1338 1390 : (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1339 : PAGE_CACHE_SHIFT)) {
1340 : /*
1341 : * make sure we stop running if someone unmounts
1342 : * the FS
1343 : */
1344 1390 : if (!(inode->i_sb->s_flags & MS_ACTIVE))
1345 : break;
1346 :
1347 1390 : if (btrfs_defrag_cancelled(root->fs_info)) {
1348 0 : printk(KERN_DEBUG "BTRFS: defrag_file cancelled\n");
1349 : ret = -EAGAIN;
1350 0 : break;
1351 : }
1352 :
1353 1390 : if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
1354 : extent_thresh, &last_len, &skip,
1355 1390 : &defrag_end, range->flags &
1356 : BTRFS_DEFRAG_RANGE_COMPRESS)) {
1357 : unsigned long next;
1358 : /*
1359 : * the should_defrag function tells us how much to skip
1360 : * bump our counter by the suggested amount
1361 : */
1362 53 : next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1363 53 : i = max(i + 1, next);
1364 53 : continue;
1365 : }
1366 :
1367 1337 : if (!newer_than) {
1368 1337 : cluster = (PAGE_CACHE_ALIGN(defrag_end) >>
1369 : PAGE_CACHE_SHIFT) - i;
1370 1337 : cluster = min(cluster, max_cluster);
1371 : } else {
1372 : cluster = max_cluster;
1373 : }
1374 :
1375 1337 : if (i + cluster > ra_index) {
1376 65 : ra_index = max(i, ra_index);
1377 65 : btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
1378 : cluster);
1379 65 : ra_index += max_cluster;
1380 : }
1381 :
1382 1337 : mutex_lock(&inode->i_mutex);
1383 1337 : if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
1384 120 : BTRFS_I(inode)->force_compress = compress_type;
1385 1337 : ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1386 1337 : if (ret < 0) {
1387 0 : mutex_unlock(&inode->i_mutex);
1388 0 : goto out_ra;
1389 : }
1390 :
1391 1337 : defrag_count += ret;
1392 1337 : balance_dirty_pages_ratelimited(inode->i_mapping);
1393 1337 : mutex_unlock(&inode->i_mutex);
1394 :
1395 1337 : if (newer_than) {
1396 0 : if (newer_off == (u64)-1)
1397 : break;
1398 :
1399 0 : if (ret > 0)
1400 0 : i += ret;
1401 :
1402 0 : newer_off = max(newer_off + 1,
1403 : (u64)i << PAGE_CACHE_SHIFT);
1404 :
1405 0 : ret = find_new_extents(root, inode,
1406 : newer_than, &newer_off,
1407 : 64 * 1024);
1408 0 : if (!ret) {
1409 0 : range->start = newer_off;
1410 0 : i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
1411 : } else {
1412 : break;
1413 : }
1414 : } else {
1415 1337 : if (ret > 0) {
1416 1337 : i += ret;
1417 1337 : last_len += ret << PAGE_CACHE_SHIFT;
1418 : } else {
1419 0 : i++;
1420 0 : last_len = 0;
1421 : }
1422 : }
1423 : }
1424 :
1425 63 : if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) {
1426 52 : filemap_flush(inode->i_mapping);
1427 52 : if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1428 : &BTRFS_I(inode)->runtime_flags))
1429 1 : filemap_flush(inode->i_mapping);
1430 : }
1431 :
1432 63 : if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1433 : /* the filemap_flush will queue IO into the worker threads, but
1434 : * we have to make sure the IO is actually started and that
1435 : * ordered extents get created before we return
1436 : */
1437 1 : atomic_inc(&root->fs_info->async_submit_draining);
1438 3 : while (atomic_read(&root->fs_info->nr_async_submits) ||
1439 : atomic_read(&root->fs_info->async_delalloc_pages)) {
1440 0 : wait_event(root->fs_info->async_submit_wait,
1441 : (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
1442 : atomic_read(&root->fs_info->async_delalloc_pages) == 0));
1443 : }
1444 1 : atomic_dec(&root->fs_info->async_submit_draining);
1445 : }
1446 :
1447 63 : if (range->compress_type == BTRFS_COMPRESS_LZO) {
1448 0 : btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
1449 : }
1450 :
1451 : ret = defrag_count;
1452 :
1453 : out_ra:
1454 63 : if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1455 1 : mutex_lock(&inode->i_mutex);
1456 1 : BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
1457 1 : mutex_unlock(&inode->i_mutex);
1458 : }
1459 63 : if (!file)
1460 0 : kfree(ra);
1461 63 : kfree(pages);
1462 63 : return ret;
1463 : }
1464 :
1465 0 : static noinline int btrfs_ioctl_resize(struct file *file,
1466 : void __user *arg)
1467 : {
1468 : u64 new_size;
1469 : u64 old_size;
1470 0 : u64 devid = 1;
1471 0 : struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
1472 : struct btrfs_ioctl_vol_args *vol_args;
1473 : struct btrfs_trans_handle *trans;
1474 : struct btrfs_device *device = NULL;
1475 : char *sizestr;
1476 : char *retptr;
1477 : char *devstr = NULL;
1478 : int ret = 0;
1479 : int mod = 0;
1480 :
1481 0 : if (!capable(CAP_SYS_ADMIN))
1482 : return -EPERM;
1483 :
1484 0 : ret = mnt_want_write_file(file);
1485 0 : if (ret)
1486 : return ret;
1487 :
1488 0 : if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
1489 : 1)) {
1490 0 : mnt_drop_write_file(file);
1491 0 : return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
1492 : }
1493 :
1494 0 : mutex_lock(&root->fs_info->volume_mutex);
1495 0 : vol_args = memdup_user(arg, sizeof(*vol_args));
1496 0 : if (IS_ERR(vol_args)) {
1497 0 : ret = PTR_ERR(vol_args);
1498 0 : goto out;
1499 : }
1500 :
1501 0 : vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1502 :
1503 0 : sizestr = vol_args->name;
1504 0 : devstr = strchr(sizestr, ':');
1505 0 : if (devstr) {
1506 0 : sizestr = devstr + 1;
1507 0 : *devstr = '\0';
1508 : devstr = vol_args->name;
1509 0 : ret = kstrtoull(devstr, 10, &devid);
1510 0 : if (ret)
1511 : goto out_free;
1512 0 : if (!devid) {
1513 : ret = -EINVAL;
1514 : goto out_free;
1515 : }
1516 0 : btrfs_info(root->fs_info, "resizing devid %llu", devid);
1517 : }
1518 :
1519 0 : device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
1520 0 : if (!device) {
1521 0 : btrfs_info(root->fs_info, "resizer unable to find device %llu",
1522 : devid);
1523 : ret = -ENODEV;
1524 0 : goto out_free;
1525 : }
1526 :
1527 0 : if (!device->writeable) {
1528 0 : btrfs_info(root->fs_info,
1529 : "resizer unable to apply on readonly device %llu",
1530 : devid);
1531 : ret = -EPERM;
1532 0 : goto out_free;
1533 : }
1534 :
1535 0 : if (!strcmp(sizestr, "max"))
1536 0 : new_size = device->bdev->bd_inode->i_size;
1537 : else {
1538 0 : if (sizestr[0] == '-') {
1539 : mod = -1;
1540 0 : sizestr++;
1541 0 : } else if (sizestr[0] == '+') {
1542 : mod = 1;
1543 0 : sizestr++;
1544 : }
1545 0 : new_size = memparse(sizestr, &retptr);
1546 0 : if (*retptr != '\0' || new_size == 0) {
1547 : ret = -EINVAL;
1548 : goto out_free;
1549 : }
1550 : }
1551 :
1552 0 : if (device->is_tgtdev_for_dev_replace) {
1553 : ret = -EPERM;
1554 : goto out_free;
1555 : }
1556 :
1557 0 : old_size = device->total_bytes;
1558 :
1559 0 : if (mod < 0) {
1560 0 : if (new_size > old_size) {
1561 : ret = -EINVAL;
1562 : goto out_free;
1563 : }
1564 0 : new_size = old_size - new_size;
1565 0 : } else if (mod > 0) {
1566 0 : if (new_size > ULLONG_MAX - old_size) {
1567 : ret = -ERANGE;
1568 : goto out_free;
1569 : }
1570 0 : new_size = old_size + new_size;
1571 : }
1572 :
1573 0 : if (new_size < 256 * 1024 * 1024) {
1574 : ret = -EINVAL;
1575 : goto out_free;
1576 : }
1577 0 : if (new_size > device->bdev->bd_inode->i_size) {
1578 : ret = -EFBIG;
1579 : goto out_free;
1580 : }
1581 :
1582 0 : do_div(new_size, root->sectorsize);
1583 0 : new_size *= root->sectorsize;
1584 :
1585 0 : printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n",
1586 : rcu_str_deref(device->name), new_size);
1587 :
1588 0 : if (new_size > old_size) {
1589 0 : trans = btrfs_start_transaction(root, 0);
1590 0 : if (IS_ERR(trans)) {
1591 0 : ret = PTR_ERR(trans);
1592 0 : goto out_free;
1593 : }
1594 0 : ret = btrfs_grow_device(trans, device, new_size);
1595 0 : btrfs_commit_transaction(trans, root);
1596 0 : } else if (new_size < old_size) {
1597 0 : ret = btrfs_shrink_device(device, new_size);
1598 : } /* equal, nothing need to do */
1599 :
1600 : out_free:
1601 0 : kfree(vol_args);
1602 : out:
1603 0 : mutex_unlock(&root->fs_info->volume_mutex);
1604 0 : atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
1605 0 : mnt_drop_write_file(file);
1606 0 : return ret;
1607 : }
1608 :
1609 341 : static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
1610 : char *name, unsigned long fd, int subvol,
1611 : u64 *transid, bool readonly,
1612 : struct btrfs_qgroup_inherit *inherit)
1613 : {
1614 : int namelen;
1615 : int ret = 0;
1616 :
1617 195 : ret = mnt_want_write_file(file);
1618 195 : if (ret)
1619 : goto out;
1620 :
1621 195 : namelen = strlen(name);
1622 195 : if (strchr(name, '/')) {
1623 : ret = -EINVAL;
1624 : goto out_drop_write;
1625 : }
1626 :
1627 195 : if (name[0] == '.' &&
1628 0 : (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1629 : ret = -EEXIST;
1630 : goto out_drop_write;
1631 : }
1632 :
1633 195 : if (subvol) {
1634 49 : ret = btrfs_mksubvol(&file->f_path, name, namelen,
1635 : NULL, transid, readonly, inherit);
1636 : } else {
1637 146 : struct fd src = fdget(fd);
1638 : struct inode *src_inode;
1639 146 : if (!src.file) {
1640 : ret = -EINVAL;
1641 : goto out_drop_write;
1642 : }
1643 :
1644 : src_inode = file_inode(src.file);
1645 292 : if (src_inode->i_sb != file_inode(file)->i_sb) {
1646 0 : btrfs_info(BTRFS_I(src_inode)->root->fs_info,
1647 : "Snapshot src from another FS");
1648 : ret = -EXDEV;
1649 146 : } else if (!inode_owner_or_capable(src_inode)) {
1650 : /*
1651 : * Subvolume creation is not restricted, but snapshots
1652 : * are limited to own subvolumes only
1653 : */
1654 : ret = -EPERM;
1655 : } else {
1656 146 : ret = btrfs_mksubvol(&file->f_path, name, namelen,
1657 : BTRFS_I(src_inode)->root,
1658 : transid, readonly, inherit);
1659 : }
1660 : fdput(src);
1661 : }
1662 : out_drop_write:
1663 195 : mnt_drop_write_file(file);
1664 : out:
1665 195 : return ret;
1666 : }
1667 :
1668 39 : static noinline int btrfs_ioctl_snap_create(struct file *file,
1669 : void __user *arg, int subvol)
1670 : {
1671 : struct btrfs_ioctl_vol_args *vol_args;
1672 : int ret;
1673 :
1674 39 : vol_args = memdup_user(arg, sizeof(*vol_args));
1675 39 : if (IS_ERR(vol_args))
1676 0 : return PTR_ERR(vol_args);
1677 39 : vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1678 :
1679 39 : ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1680 39 : vol_args->fd, subvol,
1681 : NULL, false, NULL);
1682 :
1683 39 : kfree(vol_args);
1684 39 : return ret;
1685 : }
1686 :
1687 156 : static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1688 : void __user *arg, int subvol)
1689 : {
1690 : struct btrfs_ioctl_vol_args_v2 *vol_args;
1691 : int ret;
1692 156 : u64 transid = 0;
1693 : u64 *ptr = NULL;
1694 : bool readonly = false;
1695 : struct btrfs_qgroup_inherit *inherit = NULL;
1696 :
1697 156 : vol_args = memdup_user(arg, sizeof(*vol_args));
1698 156 : if (IS_ERR(vol_args))
1699 0 : return PTR_ERR(vol_args);
1700 156 : vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
1701 :
1702 156 : if (vol_args->flags &
1703 : ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1704 : BTRFS_SUBVOL_QGROUP_INHERIT)) {
1705 : ret = -EOPNOTSUPP;
1706 : goto free_args;
1707 : }
1708 :
1709 156 : if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1710 : ptr = &transid;
1711 156 : if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1712 : readonly = true;
1713 156 : if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1714 10 : if (vol_args->size > PAGE_CACHE_SIZE) {
1715 : ret = -EINVAL;
1716 : goto free_args;
1717 : }
1718 10 : inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1719 10 : if (IS_ERR(inherit)) {
1720 0 : ret = PTR_ERR(inherit);
1721 0 : goto free_args;
1722 : }
1723 : }
1724 :
1725 312 : ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1726 156 : vol_args->fd, subvol, ptr,
1727 : readonly, inherit);
1728 156 : if (ret)
1729 : goto free_inherit;
1730 :
1731 156 : if (ptr && copy_to_user(arg +
1732 : offsetof(struct btrfs_ioctl_vol_args_v2,
1733 : transid),
1734 : ptr, sizeof(*ptr)))
1735 : ret = -EFAULT;
1736 :
1737 : free_inherit:
1738 156 : kfree(inherit);
1739 : free_args:
1740 156 : kfree(vol_args);
1741 156 : return ret;
1742 : }
1743 :
1744 138 : static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1745 : void __user *arg)
1746 : {
1747 : struct inode *inode = file_inode(file);
1748 276 : struct btrfs_root *root = BTRFS_I(inode)->root;
1749 : int ret = 0;
1750 138 : u64 flags = 0;
1751 :
1752 138 : if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
1753 : return -EINVAL;
1754 :
1755 138 : down_read(&root->fs_info->subvol_sem);
1756 138 : if (btrfs_root_readonly(root))
1757 97 : flags |= BTRFS_SUBVOL_RDONLY;
1758 138 : up_read(&root->fs_info->subvol_sem);
1759 :
1760 138 : if (copy_to_user(arg, &flags, sizeof(flags)))
1761 : ret = -EFAULT;
1762 :
1763 138 : return ret;
1764 : }
1765 :
1766 38 : static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1767 : void __user *arg)
1768 : {
1769 : struct inode *inode = file_inode(file);
1770 76 : struct btrfs_root *root = BTRFS_I(inode)->root;
1771 : struct btrfs_trans_handle *trans;
1772 : u64 root_flags;
1773 : u64 flags;
1774 : int ret = 0;
1775 :
1776 38 : if (!inode_owner_or_capable(inode))
1777 : return -EPERM;
1778 :
1779 38 : ret = mnt_want_write_file(file);
1780 38 : if (ret)
1781 : goto out;
1782 :
1783 38 : if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
1784 : ret = -EINVAL;
1785 : goto out_drop_write;
1786 : }
1787 :
1788 38 : if (copy_from_user(&flags, arg, sizeof(flags))) {
1789 : ret = -EFAULT;
1790 : goto out_drop_write;
1791 : }
1792 :
1793 38 : if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1794 : ret = -EINVAL;
1795 : goto out_drop_write;
1796 : }
1797 :
1798 38 : if (flags & ~BTRFS_SUBVOL_RDONLY) {
1799 : ret = -EOPNOTSUPP;
1800 : goto out_drop_write;
1801 : }
1802 :
1803 38 : down_write(&root->fs_info->subvol_sem);
1804 :
1805 : /* nothing to do */
1806 76 : if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1807 : goto out_drop_sem;
1808 :
1809 : root_flags = btrfs_root_flags(&root->root_item);
1810 38 : if (flags & BTRFS_SUBVOL_RDONLY) {
1811 37 : btrfs_set_root_flags(&root->root_item,
1812 : root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1813 : } else {
1814 : /*
1815 : * Block RO -> RW transition if this subvolume is involved in
1816 : * send
1817 : */
1818 : spin_lock(&root->root_item_lock);
1819 1 : if (root->send_in_progress == 0) {
1820 1 : btrfs_set_root_flags(&root->root_item,
1821 : root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1822 : spin_unlock(&root->root_item_lock);
1823 : } else {
1824 : spin_unlock(&root->root_item_lock);
1825 0 : btrfs_warn(root->fs_info,
1826 : "Attempt to set subvolume %llu read-write during send",
1827 : root->root_key.objectid);
1828 : ret = -EPERM;
1829 0 : goto out_drop_sem;
1830 : }
1831 : }
1832 :
1833 38 : trans = btrfs_start_transaction(root, 1);
1834 38 : if (IS_ERR(trans)) {
1835 0 : ret = PTR_ERR(trans);
1836 0 : goto out_reset;
1837 : }
1838 :
1839 38 : ret = btrfs_update_root(trans, root->fs_info->tree_root,
1840 : &root->root_key, &root->root_item);
1841 :
1842 38 : btrfs_commit_transaction(trans, root);
1843 : out_reset:
1844 38 : if (ret)
1845 : btrfs_set_root_flags(&root->root_item, root_flags);
1846 : out_drop_sem:
1847 38 : up_write(&root->fs_info->subvol_sem);
1848 : out_drop_write:
1849 38 : mnt_drop_write_file(file);
1850 : out:
1851 38 : return ret;
1852 : }
1853 :
1854 : /*
1855 : * helper to check if the subvolume references other subvolumes
1856 : */
1857 34 : static noinline int may_destroy_subvol(struct btrfs_root *root)
1858 : {
1859 : struct btrfs_path *path;
1860 : struct btrfs_dir_item *di;
1861 : struct btrfs_key key;
1862 : u64 dir_id;
1863 : int ret;
1864 :
1865 34 : path = btrfs_alloc_path();
1866 34 : if (!path)
1867 : return -ENOMEM;
1868 :
1869 : /* Make sure this root isn't set as the default subvol */
1870 34 : dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
1871 34 : di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path,
1872 : dir_id, "default", 7, 0);
1873 68 : if (di && !IS_ERR(di)) {
1874 34 : btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key);
1875 34 : if (key.objectid == root->root_key.objectid) {
1876 : ret = -EPERM;
1877 1 : btrfs_err(root->fs_info, "deleting default subvolume "
1878 : "%llu is not allowed", key.objectid);
1879 1 : goto out;
1880 : }
1881 33 : btrfs_release_path(path);
1882 : }
1883 :
1884 33 : key.objectid = root->root_key.objectid;
1885 33 : key.type = BTRFS_ROOT_REF_KEY;
1886 33 : key.offset = (u64)-1;
1887 :
1888 33 : ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
1889 : &key, path, 0, 0);
1890 33 : if (ret < 0)
1891 : goto out;
1892 33 : BUG_ON(ret == 0);
1893 :
1894 : ret = 0;
1895 33 : if (path->slots[0] > 0) {
1896 33 : path->slots[0]--;
1897 33 : btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1898 66 : if (key.objectid == root->root_key.objectid &&
1899 33 : key.type == BTRFS_ROOT_REF_KEY)
1900 : ret = -ENOTEMPTY;
1901 : }
1902 : out:
1903 34 : btrfs_free_path(path);
1904 34 : return ret;
1905 : }
1906 :
1907 590 : static noinline int key_in_sk(struct btrfs_key *key,
1908 : struct btrfs_ioctl_search_key *sk)
1909 : {
1910 : struct btrfs_key test;
1911 : int ret;
1912 :
1913 590 : test.objectid = sk->min_objectid;
1914 590 : test.type = sk->min_type;
1915 590 : test.offset = sk->min_offset;
1916 :
1917 590 : ret = btrfs_comp_cpu_keys(key, &test);
1918 590 : if (ret < 0)
1919 : return 0;
1920 :
1921 590 : test.objectid = sk->max_objectid;
1922 590 : test.type = sk->max_type;
1923 590 : test.offset = sk->max_offset;
1924 :
1925 590 : ret = btrfs_comp_cpu_keys(key, &test);
1926 590 : if (ret > 0)
1927 : return 0;
1928 208 : return 1;
1929 : }
1930 :
1931 216 : static noinline int copy_to_sk(struct btrfs_root *root,
1932 : struct btrfs_path *path,
1933 : struct btrfs_key *key,
1934 : struct btrfs_ioctl_search_key *sk,
1935 : size_t *buf_size,
1936 : char __user *ubuf,
1937 : unsigned long *sk_offset,
1938 : int *num_found)
1939 : {
1940 : u64 found_transid;
1941 216 : struct extent_buffer *leaf;
1942 : struct btrfs_ioctl_search_header sh;
1943 : unsigned long item_off;
1944 : unsigned long item_len;
1945 : int nritems;
1946 : int i;
1947 : int slot;
1948 : int ret = 0;
1949 :
1950 216 : leaf = path->nodes[0];
1951 216 : slot = path->slots[0];
1952 216 : nritems = btrfs_header_nritems(leaf);
1953 :
1954 216 : if (btrfs_header_generation(leaf) > sk->max_transid) {
1955 : i = nritems;
1956 : goto advance_key;
1957 : }
1958 : found_transid = btrfs_header_generation(leaf);
1959 :
1960 472 : for (i = slot; i < nritems; i++) {
1961 590 : item_off = btrfs_item_ptr_offset(leaf, i);
1962 590 : item_len = btrfs_item_size_nr(leaf, i);
1963 :
1964 590 : btrfs_item_key_to_cpu(leaf, key, i);
1965 590 : if (!key_in_sk(key, sk))
1966 382 : continue;
1967 :
1968 208 : if (sizeof(sh) + item_len > *buf_size) {
1969 0 : if (*num_found) {
1970 : ret = 1;
1971 : goto out;
1972 : }
1973 :
1974 : /*
1975 : * return one empty item back for v1, which does not
1976 : * handle -EOVERFLOW
1977 : */
1978 :
1979 0 : *buf_size = sizeof(sh) + item_len;
1980 : item_len = 0;
1981 : ret = -EOVERFLOW;
1982 : }
1983 :
1984 208 : if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
1985 : ret = 1;
1986 : goto out;
1987 : }
1988 :
1989 208 : sh.objectid = key->objectid;
1990 208 : sh.offset = key->offset;
1991 208 : sh.type = key->type;
1992 208 : sh.len = item_len;
1993 208 : sh.transid = found_transid;
1994 :
1995 : /* copy search result header */
1996 416 : if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) {
1997 : ret = -EFAULT;
1998 : goto out;
1999 : }
2000 :
2001 208 : *sk_offset += sizeof(sh);
2002 :
2003 208 : if (item_len) {
2004 208 : char __user *up = ubuf + *sk_offset;
2005 : /* copy the item */
2006 208 : if (read_extent_buffer_to_user(leaf, up,
2007 : item_off, item_len)) {
2008 : ret = -EFAULT;
2009 : goto out;
2010 : }
2011 :
2012 208 : *sk_offset += item_len;
2013 : }
2014 208 : (*num_found)++;
2015 :
2016 208 : if (ret) /* -EOVERFLOW from above */
2017 : goto out;
2018 :
2019 208 : if (*num_found >= sk->nr_items) {
2020 : ret = 1;
2021 : goto out;
2022 : }
2023 : }
2024 : advance_key:
2025 : ret = 0;
2026 98 : if (key->offset < (u64)-1 && key->offset < sk->max_offset)
2027 98 : key->offset++;
2028 0 : else if (key->type < (u8)-1 && key->type < sk->max_type) {
2029 0 : key->offset = 0;
2030 0 : key->type++;
2031 0 : } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
2032 0 : key->offset = 0;
2033 0 : key->type = 0;
2034 0 : key->objectid++;
2035 : } else
2036 : ret = 1;
2037 : out:
2038 : /*
2039 : * 0: all items from this leaf copied, continue with next
2040 : * 1: * more items can be copied, but unused buffer is too small
2041 : * * all items were found
2042 : * Either way, it will stops the loop which iterates to the next
2043 : * leaf
2044 : * -EOVERFLOW: item was to large for buffer
2045 : * -EFAULT: could not copy extent buffer back to userspace
2046 : */
2047 216 : return ret;
2048 : }
2049 :
2050 222 : static noinline int search_ioctl(struct inode *inode,
2051 : struct btrfs_ioctl_search_key *sk,
2052 : size_t *buf_size,
2053 : char __user *ubuf)
2054 : {
2055 : struct btrfs_root *root;
2056 : struct btrfs_key key;
2057 216 : struct btrfs_path *path;
2058 222 : struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
2059 : int ret;
2060 222 : int num_found = 0;
2061 222 : unsigned long sk_offset = 0;
2062 :
2063 222 : if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
2064 0 : *buf_size = sizeof(struct btrfs_ioctl_search_header);
2065 0 : return -EOVERFLOW;
2066 : }
2067 :
2068 222 : path = btrfs_alloc_path();
2069 222 : if (!path)
2070 : return -ENOMEM;
2071 :
2072 222 : if (sk->tree_id == 0) {
2073 : /* search the root of the inode that was passed */
2074 0 : root = BTRFS_I(inode)->root;
2075 : } else {
2076 222 : key.objectid = sk->tree_id;
2077 222 : key.type = BTRFS_ROOT_ITEM_KEY;
2078 222 : key.offset = (u64)-1;
2079 : root = btrfs_read_fs_root_no_name(info, &key);
2080 222 : if (IS_ERR(root)) {
2081 0 : printk(KERN_ERR "BTRFS: could not find root %llu\n",
2082 : sk->tree_id);
2083 0 : btrfs_free_path(path);
2084 0 : return -ENOENT;
2085 : }
2086 : }
2087 :
2088 222 : key.objectid = sk->min_objectid;
2089 222 : key.type = sk->min_type;
2090 222 : key.offset = sk->min_offset;
2091 :
2092 222 : path->keep_locks = 1;
2093 :
2094 : while (1) {
2095 320 : ret = btrfs_search_forward(root, &key, path, sk->min_transid);
2096 320 : if (ret != 0) {
2097 104 : if (ret > 0)
2098 : ret = 0;
2099 : goto err;
2100 : }
2101 216 : ret = copy_to_sk(root, path, &key, sk, buf_size, ubuf,
2102 : &sk_offset, &num_found);
2103 216 : btrfs_release_path(path);
2104 216 : if (ret)
2105 : break;
2106 :
2107 : }
2108 118 : if (ret > 0)
2109 : ret = 0;
2110 : err:
2111 222 : sk->nr_items = num_found;
2112 222 : btrfs_free_path(path);
2113 222 : return ret;
2114 : }
2115 :
2116 444 : static noinline int btrfs_ioctl_tree_search(struct file *file,
2117 : void __user *argp)
2118 : {
2119 : struct btrfs_ioctl_search_args __user *uargs;
2120 : struct btrfs_ioctl_search_key sk;
2121 : struct inode *inode;
2122 : int ret;
2123 : size_t buf_size;
2124 :
2125 222 : if (!capable(CAP_SYS_ADMIN))
2126 : return -EPERM;
2127 :
2128 : uargs = (struct btrfs_ioctl_search_args __user *)argp;
2129 :
2130 444 : if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
2131 : return -EFAULT;
2132 :
2133 222 : buf_size = sizeof(uargs->buf);
2134 :
2135 : inode = file_inode(file);
2136 222 : ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
2137 :
2138 : /*
2139 : * In the origin implementation an overflow is handled by returning a
2140 : * search header with a len of zero, so reset ret.
2141 : */
2142 222 : if (ret == -EOVERFLOW)
2143 : ret = 0;
2144 :
2145 444 : if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
2146 : ret = -EFAULT;
2147 222 : return ret;
2148 : }
2149 :
2150 0 : static noinline int btrfs_ioctl_tree_search_v2(struct file *file,
2151 : void __user *argp)
2152 : {
2153 : struct btrfs_ioctl_search_args_v2 __user *uarg;
2154 : struct btrfs_ioctl_search_args_v2 args;
2155 : struct inode *inode;
2156 : int ret;
2157 : size_t buf_size;
2158 : const size_t buf_limit = 16 * 1024 * 1024;
2159 :
2160 0 : if (!capable(CAP_SYS_ADMIN))
2161 : return -EPERM;
2162 :
2163 : /* copy search header and buffer size */
2164 : uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp;
2165 0 : if (copy_from_user(&args, uarg, sizeof(args)))
2166 : return -EFAULT;
2167 :
2168 0 : buf_size = args.buf_size;
2169 :
2170 0 : if (buf_size < sizeof(struct btrfs_ioctl_search_header))
2171 : return -EOVERFLOW;
2172 :
2173 : /* limit result size to 16MB */
2174 0 : if (buf_size > buf_limit)
2175 0 : buf_size = buf_limit;
2176 :
2177 : inode = file_inode(file);
2178 0 : ret = search_ioctl(inode, &args.key, &buf_size,
2179 0 : (char *)(&uarg->buf[0]));
2180 0 : if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
2181 : ret = -EFAULT;
2182 0 : else if (ret == -EOVERFLOW &&
2183 0 : copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
2184 : ret = -EFAULT;
2185 :
2186 0 : return ret;
2187 : }
2188 :
2189 : /*
2190 : * Search INODE_REFs to identify path name of 'dirid' directory
2191 : * in a 'tree_id' tree. and sets path name to 'name'.
2192 : */
2193 44 : static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
2194 : u64 tree_id, u64 dirid, char *name)
2195 : {
2196 : struct btrfs_root *root;
2197 : struct btrfs_key key;
2198 : char *ptr;
2199 : int ret = -1;
2200 : int slot;
2201 : int len;
2202 : int total_len = 0;
2203 : struct btrfs_inode_ref *iref;
2204 : struct extent_buffer *l;
2205 : struct btrfs_path *path;
2206 :
2207 44 : if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
2208 44 : name[0]='\0';
2209 44 : return 0;
2210 : }
2211 :
2212 0 : path = btrfs_alloc_path();
2213 0 : if (!path)
2214 : return -ENOMEM;
2215 :
2216 0 : ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
2217 :
2218 0 : key.objectid = tree_id;
2219 0 : key.type = BTRFS_ROOT_ITEM_KEY;
2220 0 : key.offset = (u64)-1;
2221 : root = btrfs_read_fs_root_no_name(info, &key);
2222 0 : if (IS_ERR(root)) {
2223 0 : printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id);
2224 : ret = -ENOENT;
2225 0 : goto out;
2226 : }
2227 :
2228 0 : key.objectid = dirid;
2229 0 : key.type = BTRFS_INODE_REF_KEY;
2230 0 : key.offset = (u64)-1;
2231 :
2232 : while (1) {
2233 0 : ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2234 0 : if (ret < 0)
2235 : goto out;
2236 0 : else if (ret > 0) {
2237 0 : ret = btrfs_previous_item(root, path, dirid,
2238 : BTRFS_INODE_REF_KEY);
2239 0 : if (ret < 0)
2240 : goto out;
2241 0 : else if (ret > 0) {
2242 : ret = -ENOENT;
2243 : goto out;
2244 : }
2245 : }
2246 :
2247 0 : l = path->nodes[0];
2248 0 : slot = path->slots[0];
2249 0 : btrfs_item_key_to_cpu(l, &key, slot);
2250 :
2251 0 : iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2252 0 : len = btrfs_inode_ref_name_len(l, iref);
2253 0 : ptr -= len + 1;
2254 0 : total_len += len + 1;
2255 0 : if (ptr < name) {
2256 : ret = -ENAMETOOLONG;
2257 : goto out;
2258 : }
2259 :
2260 0 : *(ptr + len) = '/';
2261 0 : read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
2262 :
2263 0 : if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2264 : break;
2265 :
2266 0 : btrfs_release_path(path);
2267 0 : key.objectid = key.offset;
2268 0 : key.offset = (u64)-1;
2269 : dirid = key.objectid;
2270 0 : }
2271 0 : memmove(name, ptr, total_len);
2272 0 : name[total_len] = '\0';
2273 : ret = 0;
2274 : out:
2275 0 : btrfs_free_path(path);
2276 0 : return ret;
2277 : }
2278 :
2279 88 : static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2280 : void __user *argp)
2281 : {
2282 : struct btrfs_ioctl_ino_lookup_args *args;
2283 : struct inode *inode;
2284 : int ret;
2285 :
2286 44 : if (!capable(CAP_SYS_ADMIN))
2287 : return -EPERM;
2288 :
2289 44 : args = memdup_user(argp, sizeof(*args));
2290 44 : if (IS_ERR(args))
2291 0 : return PTR_ERR(args);
2292 :
2293 : inode = file_inode(file);
2294 :
2295 44 : if (args->treeid == 0)
2296 33 : args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2297 :
2298 44 : ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2299 : args->treeid, args->objectid,
2300 44 : args->name);
2301 :
2302 88 : if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2303 : ret = -EFAULT;
2304 :
2305 44 : kfree(args);
2306 44 : return ret;
2307 : }
2308 :
2309 34 : static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2310 : void __user *arg)
2311 : {
2312 34 : struct dentry *parent = file->f_path.dentry;
2313 : struct dentry *dentry;
2314 34 : struct inode *dir = parent->d_inode;
2315 : struct inode *inode;
2316 34 : struct btrfs_root *root = BTRFS_I(dir)->root;
2317 : struct btrfs_root *dest = NULL;
2318 : struct btrfs_ioctl_vol_args *vol_args;
2319 : struct btrfs_trans_handle *trans;
2320 : struct btrfs_block_rsv block_rsv;
2321 : u64 root_flags;
2322 : u64 qgroup_reserved;
2323 : int namelen;
2324 : int ret;
2325 : int err = 0;
2326 :
2327 34 : vol_args = memdup_user(arg, sizeof(*vol_args));
2328 34 : if (IS_ERR(vol_args))
2329 0 : return PTR_ERR(vol_args);
2330 :
2331 34 : vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2332 34 : namelen = strlen(vol_args->name);
2333 68 : if (strchr(vol_args->name, '/') ||
2334 34 : strncmp(vol_args->name, "..", namelen) == 0) {
2335 : err = -EINVAL;
2336 : goto out;
2337 : }
2338 :
2339 34 : err = mnt_want_write_file(file);
2340 34 : if (err)
2341 : goto out;
2342 :
2343 :
2344 34 : err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
2345 34 : if (err == -EINTR)
2346 : goto out_drop_write;
2347 34 : dentry = lookup_one_len(vol_args->name, parent, namelen);
2348 34 : if (IS_ERR(dentry)) {
2349 0 : err = PTR_ERR(dentry);
2350 0 : goto out_unlock_dir;
2351 : }
2352 :
2353 34 : if (!dentry->d_inode) {
2354 : err = -ENOENT;
2355 : goto out_dput;
2356 : }
2357 :
2358 : inode = dentry->d_inode;
2359 34 : dest = BTRFS_I(inode)->root;
2360 34 : if (!capable(CAP_SYS_ADMIN)) {
2361 : /*
2362 : * Regular user. Only allow this with a special mount
2363 : * option, when the user has write+exec access to the
2364 : * subvol root, and when rmdir(2) would have been
2365 : * allowed.
2366 : *
2367 : * Note that this is _not_ check that the subvol is
2368 : * empty or doesn't contain data that we wouldn't
2369 : * otherwise be able to delete.
2370 : *
2371 : * Users who want to delete empty subvols should try
2372 : * rmdir(2).
2373 : */
2374 : err = -EPERM;
2375 0 : if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
2376 : goto out_dput;
2377 :
2378 : /*
2379 : * Do not allow deletion if the parent dir is the same
2380 : * as the dir to be deleted. That means the ioctl
2381 : * must be called on the dentry referencing the root
2382 : * of the subvol, not a random directory contained
2383 : * within it.
2384 : */
2385 : err = -EINVAL;
2386 0 : if (root == dest)
2387 : goto out_dput;
2388 :
2389 0 : err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2390 0 : if (err)
2391 : goto out_dput;
2392 : }
2393 :
2394 : /* check if subvolume may be deleted by a user */
2395 34 : err = btrfs_may_delete(dir, dentry, 1);
2396 34 : if (err)
2397 : goto out_dput;
2398 :
2399 34 : if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
2400 : err = -EINVAL;
2401 : goto out_dput;
2402 : }
2403 :
2404 34 : mutex_lock(&inode->i_mutex);
2405 :
2406 : /*
2407 : * Don't allow to delete a subvolume with send in progress. This is
2408 : * inside the i_mutex so the error handling that has to drop the bit
2409 : * again is not run concurrently.
2410 : */
2411 : spin_lock(&dest->root_item_lock);
2412 : root_flags = btrfs_root_flags(&dest->root_item);
2413 34 : if (dest->send_in_progress == 0) {
2414 34 : btrfs_set_root_flags(&dest->root_item,
2415 : root_flags | BTRFS_ROOT_SUBVOL_DEAD);
2416 : spin_unlock(&dest->root_item_lock);
2417 : } else {
2418 : spin_unlock(&dest->root_item_lock);
2419 0 : btrfs_warn(root->fs_info,
2420 : "Attempt to delete subvolume %llu during send",
2421 : dest->root_key.objectid);
2422 : err = -EPERM;
2423 0 : goto out_dput;
2424 : }
2425 :
2426 34 : err = d_invalidate(dentry);
2427 34 : if (err)
2428 : goto out_unlock;
2429 :
2430 34 : down_write(&root->fs_info->subvol_sem);
2431 :
2432 34 : err = may_destroy_subvol(dest);
2433 34 : if (err)
2434 : goto out_up_write;
2435 :
2436 33 : btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
2437 : /*
2438 : * One for dir inode, two for dir entries, two for root
2439 : * ref/backref.
2440 : */
2441 33 : err = btrfs_subvolume_reserve_metadata(root, &block_rsv,
2442 : 5, &qgroup_reserved, true);
2443 33 : if (err)
2444 : goto out_up_write;
2445 :
2446 33 : trans = btrfs_start_transaction(root, 0);
2447 33 : if (IS_ERR(trans)) {
2448 0 : err = PTR_ERR(trans);
2449 0 : goto out_release;
2450 : }
2451 33 : trans->block_rsv = &block_rsv;
2452 33 : trans->bytes_reserved = block_rsv.size;
2453 :
2454 66 : ret = btrfs_unlink_subvol(trans, root, dir,
2455 : dest->root_key.objectid,
2456 33 : dentry->d_name.name,
2457 33 : dentry->d_name.len);
2458 33 : if (ret) {
2459 : err = ret;
2460 0 : btrfs_abort_transaction(trans, root, ret);
2461 0 : goto out_end_trans;
2462 : }
2463 :
2464 33 : btrfs_record_root_in_trans(trans, dest);
2465 :
2466 33 : memset(&dest->root_item.drop_progress, 0,
2467 : sizeof(dest->root_item.drop_progress));
2468 33 : dest->root_item.drop_level = 0;
2469 : btrfs_set_root_refs(&dest->root_item, 0);
2470 :
2471 66 : if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) {
2472 66 : ret = btrfs_insert_orphan_item(trans,
2473 33 : root->fs_info->tree_root,
2474 : dest->root_key.objectid);
2475 33 : if (ret) {
2476 0 : btrfs_abort_transaction(trans, root, ret);
2477 : err = ret;
2478 0 : goto out_end_trans;
2479 : }
2480 : }
2481 :
2482 66 : ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2483 33 : dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
2484 : dest->root_key.objectid);
2485 33 : if (ret && ret != -ENOENT) {
2486 0 : btrfs_abort_transaction(trans, root, ret);
2487 : err = ret;
2488 0 : goto out_end_trans;
2489 : }
2490 66 : if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) {
2491 0 : ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2492 : dest->root_item.received_uuid,
2493 : BTRFS_UUID_KEY_RECEIVED_SUBVOL,
2494 : dest->root_key.objectid);
2495 0 : if (ret && ret != -ENOENT) {
2496 0 : btrfs_abort_transaction(trans, root, ret);
2497 : err = ret;
2498 0 : goto out_end_trans;
2499 : }
2500 : }
2501 :
2502 : out_end_trans:
2503 33 : trans->block_rsv = NULL;
2504 33 : trans->bytes_reserved = 0;
2505 33 : ret = btrfs_end_transaction(trans, root);
2506 33 : if (ret && !err)
2507 : err = ret;
2508 33 : inode->i_flags |= S_DEAD;
2509 : out_release:
2510 33 : btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
2511 : out_up_write:
2512 34 : up_write(&root->fs_info->subvol_sem);
2513 : out_unlock:
2514 34 : if (err) {
2515 : spin_lock(&dest->root_item_lock);
2516 : root_flags = btrfs_root_flags(&dest->root_item);
2517 1 : btrfs_set_root_flags(&dest->root_item,
2518 : root_flags & ~BTRFS_ROOT_SUBVOL_DEAD);
2519 : spin_unlock(&dest->root_item_lock);
2520 : }
2521 34 : mutex_unlock(&inode->i_mutex);
2522 34 : if (!err) {
2523 33 : shrink_dcache_sb(root->fs_info->sb);
2524 33 : btrfs_invalidate_inodes(dest);
2525 33 : d_delete(dentry);
2526 : ASSERT(dest->send_in_progress == 0);
2527 :
2528 : /* the last ref */
2529 33 : if (dest->cache_inode) {
2530 0 : iput(dest->cache_inode);
2531 0 : dest->cache_inode = NULL;
2532 : }
2533 : }
2534 : out_dput:
2535 34 : dput(dentry);
2536 : out_unlock_dir:
2537 34 : mutex_unlock(&dir->i_mutex);
2538 : out_drop_write:
2539 34 : mnt_drop_write_file(file);
2540 : out:
2541 34 : kfree(vol_args);
2542 34 : return err;
2543 : }
2544 :
2545 330 : static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
2546 : {
2547 : struct inode *inode = file_inode(file);
2548 332 : struct btrfs_root *root = BTRFS_I(inode)->root;
2549 : struct btrfs_ioctl_defrag_range_args *range;
2550 : int ret;
2551 :
2552 166 : ret = mnt_want_write_file(file);
2553 166 : if (ret)
2554 : return ret;
2555 :
2556 166 : if (btrfs_root_readonly(root)) {
2557 : ret = -EROFS;
2558 : goto out;
2559 : }
2560 :
2561 166 : switch (inode->i_mode & S_IFMT) {
2562 : case S_IFDIR:
2563 2 : if (!capable(CAP_SYS_ADMIN)) {
2564 : ret = -EPERM;
2565 : goto out;
2566 : }
2567 2 : ret = btrfs_defrag_root(root);
2568 2 : if (ret)
2569 : goto out;
2570 2 : ret = btrfs_defrag_root(root->fs_info->extent_root);
2571 2 : break;
2572 : case S_IFREG:
2573 164 : if (!(file->f_mode & FMODE_WRITE)) {
2574 : ret = -EINVAL;
2575 : goto out;
2576 : }
2577 :
2578 164 : range = kzalloc(sizeof(*range), GFP_KERNEL);
2579 164 : if (!range) {
2580 : ret = -ENOMEM;
2581 : goto out;
2582 : }
2583 :
2584 164 : if (argp) {
2585 156 : if (copy_from_user(range, argp,
2586 : sizeof(*range))) {
2587 : ret = -EFAULT;
2588 0 : kfree(range);
2589 0 : goto out;
2590 : }
2591 : /* compression requires us to start the IO */
2592 156 : if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2593 1 : range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2594 1 : range->extent_thresh = (u32)-1;
2595 : }
2596 : } else {
2597 : /* the rest are all set to zero by kzalloc */
2598 8 : range->len = (u64)-1;
2599 : }
2600 164 : ret = btrfs_defrag_file(file_inode(file), file,
2601 : range, 0, 0);
2602 164 : if (ret > 0)
2603 : ret = 0;
2604 164 : kfree(range);
2605 164 : break;
2606 : default:
2607 : ret = -EINVAL;
2608 : }
2609 : out:
2610 166 : mnt_drop_write_file(file);
2611 166 : return ret;
2612 : }
2613 :
2614 0 : static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
2615 : {
2616 : struct btrfs_ioctl_vol_args *vol_args;
2617 : int ret;
2618 :
2619 0 : if (!capable(CAP_SYS_ADMIN))
2620 : return -EPERM;
2621 :
2622 0 : if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2623 : 1)) {
2624 : return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2625 : }
2626 :
2627 0 : mutex_lock(&root->fs_info->volume_mutex);
2628 0 : vol_args = memdup_user(arg, sizeof(*vol_args));
2629 0 : if (IS_ERR(vol_args)) {
2630 0 : ret = PTR_ERR(vol_args);
2631 0 : goto out;
2632 : }
2633 :
2634 0 : vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2635 0 : ret = btrfs_init_new_device(root, vol_args->name);
2636 :
2637 0 : kfree(vol_args);
2638 : out:
2639 0 : mutex_unlock(&root->fs_info->volume_mutex);
2640 0 : atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2641 0 : return ret;
2642 : }
2643 :
2644 0 : static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
2645 : {
2646 0 : struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
2647 : struct btrfs_ioctl_vol_args *vol_args;
2648 : int ret;
2649 :
2650 0 : if (!capable(CAP_SYS_ADMIN))
2651 : return -EPERM;
2652 :
2653 0 : ret = mnt_want_write_file(file);
2654 0 : if (ret)
2655 0 : return ret;
2656 :
2657 0 : vol_args = memdup_user(arg, sizeof(*vol_args));
2658 0 : if (IS_ERR(vol_args)) {
2659 0 : ret = PTR_ERR(vol_args);
2660 0 : goto err_drop;
2661 : }
2662 :
2663 0 : vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2664 :
2665 0 : if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2666 : 1)) {
2667 : ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2668 : goto out;
2669 : }
2670 :
2671 0 : mutex_lock(&root->fs_info->volume_mutex);
2672 0 : ret = btrfs_rm_device(root, vol_args->name);
2673 0 : mutex_unlock(&root->fs_info->volume_mutex);
2674 0 : atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2675 :
2676 : out:
2677 0 : kfree(vol_args);
2678 : err_drop:
2679 0 : mnt_drop_write_file(file);
2680 0 : return ret;
2681 : }
2682 :
2683 160 : static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
2684 : {
2685 : struct btrfs_ioctl_fs_info_args *fi_args;
2686 : struct btrfs_device *device;
2687 : struct btrfs_device *next;
2688 160 : struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2689 : int ret = 0;
2690 :
2691 160 : fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
2692 160 : if (!fi_args)
2693 : return -ENOMEM;
2694 :
2695 160 : mutex_lock(&fs_devices->device_list_mutex);
2696 160 : fi_args->num_devices = fs_devices->num_devices;
2697 160 : memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid));
2698 :
2699 335 : list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
2700 175 : if (device->devid > fi_args->max_id)
2701 161 : fi_args->max_id = device->devid;
2702 : }
2703 160 : mutex_unlock(&fs_devices->device_list_mutex);
2704 :
2705 160 : fi_args->nodesize = root->fs_info->super_copy->nodesize;
2706 160 : fi_args->sectorsize = root->fs_info->super_copy->sectorsize;
2707 160 : fi_args->clone_alignment = root->fs_info->super_copy->sectorsize;
2708 :
2709 160 : if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2710 : ret = -EFAULT;
2711 :
2712 160 : kfree(fi_args);
2713 160 : return ret;
2714 : }
2715 :
2716 60 : static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
2717 : {
2718 : struct btrfs_ioctl_dev_info_args *di_args;
2719 : struct btrfs_device *dev;
2720 60 : struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2721 : int ret = 0;
2722 : char *s_uuid = NULL;
2723 :
2724 60 : di_args = memdup_user(arg, sizeof(*di_args));
2725 60 : if (IS_ERR(di_args))
2726 : return PTR_ERR(di_args);
2727 :
2728 120 : if (!btrfs_is_empty_uuid(di_args->uuid))
2729 : s_uuid = di_args->uuid;
2730 :
2731 60 : mutex_lock(&fs_devices->device_list_mutex);
2732 60 : dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
2733 :
2734 60 : if (!dev) {
2735 : ret = -ENODEV;
2736 : goto out;
2737 : }
2738 :
2739 39 : di_args->devid = dev->devid;
2740 39 : di_args->bytes_used = dev->bytes_used;
2741 39 : di_args->total_bytes = dev->total_bytes;
2742 39 : memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
2743 39 : if (dev->name) {
2744 : struct rcu_string *name;
2745 :
2746 : rcu_read_lock();
2747 39 : name = rcu_dereference(dev->name);
2748 39 : strncpy(di_args->path, name->str, sizeof(di_args->path));
2749 : rcu_read_unlock();
2750 39 : di_args->path[sizeof(di_args->path) - 1] = 0;
2751 : } else {
2752 0 : di_args->path[0] = '\0';
2753 : }
2754 :
2755 : out:
2756 60 : mutex_unlock(&fs_devices->device_list_mutex);
2757 99 : if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2758 : ret = -EFAULT;
2759 :
2760 60 : kfree(di_args);
2761 60 : return ret;
2762 : }
2763 :
2764 0 : static struct page *extent_same_get_page(struct inode *inode, u64 off)
2765 : {
2766 : struct page *page;
2767 : pgoff_t index;
2768 0 : struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
2769 :
2770 0 : index = off >> PAGE_CACHE_SHIFT;
2771 :
2772 0 : page = grab_cache_page(inode->i_mapping, index);
2773 0 : if (!page)
2774 : return NULL;
2775 :
2776 0 : if (!PageUptodate(page)) {
2777 0 : if (extent_read_full_page_nolock(tree, page, btrfs_get_extent,
2778 : 0))
2779 : return NULL;
2780 0 : lock_page(page);
2781 0 : if (!PageUptodate(page)) {
2782 0 : unlock_page(page);
2783 0 : page_cache_release(page);
2784 0 : return NULL;
2785 : }
2786 : }
2787 0 : unlock_page(page);
2788 :
2789 0 : return page;
2790 : }
2791 :
2792 90 : static inline void lock_extent_range(struct inode *inode, u64 off, u64 len)
2793 : {
2794 : /* do any pending delalloc/csum calc on src, one way or
2795 : another, and lock file content */
2796 : while (1) {
2797 : struct btrfs_ordered_extent *ordered;
2798 100 : lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2799 100 : ordered = btrfs_lookup_first_ordered_extent(inode,
2800 : off + len - 1);
2801 100 : if ((!ordered ||
2802 0 : ordered->file_offset + ordered->len <= off ||
2803 100 : ordered->file_offset >= off + len) &&
2804 100 : !test_range_bit(&BTRFS_I(inode)->io_tree, off,
2805 : off + len - 1, EXTENT_DELALLOC, 0, NULL)) {
2806 90 : if (ordered)
2807 0 : btrfs_put_ordered_extent(ordered);
2808 : break;
2809 : }
2810 10 : unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2811 10 : if (ordered)
2812 0 : btrfs_put_ordered_extent(ordered);
2813 10 : btrfs_wait_ordered_range(inode, off, len);
2814 10 : }
2815 90 : }
2816 :
2817 0 : static void btrfs_double_unlock(struct inode *inode1, u64 loff1,
2818 : struct inode *inode2, u64 loff2, u64 len)
2819 : {
2820 0 : unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
2821 0 : unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
2822 :
2823 0 : mutex_unlock(&inode1->i_mutex);
2824 0 : mutex_unlock(&inode2->i_mutex);
2825 0 : }
2826 :
2827 0 : static void btrfs_double_lock(struct inode *inode1, u64 loff1,
2828 : struct inode *inode2, u64 loff2, u64 len)
2829 : {
2830 0 : if (inode1 < inode2) {
2831 : swap(inode1, inode2);
2832 : swap(loff1, loff2);
2833 : }
2834 :
2835 0 : mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT);
2836 0 : lock_extent_range(inode1, loff1, len);
2837 0 : if (inode1 != inode2) {
2838 0 : mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD);
2839 0 : lock_extent_range(inode2, loff2, len);
2840 : }
2841 0 : }
2842 :
2843 0 : static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst,
2844 : u64 dst_loff, u64 len)
2845 : {
2846 : int ret = 0;
2847 : struct page *src_page, *dst_page;
2848 : unsigned int cmp_len = PAGE_CACHE_SIZE;
2849 : void *addr, *dst_addr;
2850 :
2851 0 : while (len) {
2852 0 : if (len < PAGE_CACHE_SIZE)
2853 0 : cmp_len = len;
2854 :
2855 0 : src_page = extent_same_get_page(src, loff);
2856 0 : if (!src_page)
2857 : return -EINVAL;
2858 0 : dst_page = extent_same_get_page(dst, dst_loff);
2859 0 : if (!dst_page) {
2860 0 : page_cache_release(src_page);
2861 0 : return -EINVAL;
2862 : }
2863 : addr = kmap_atomic(src_page);
2864 : dst_addr = kmap_atomic(dst_page);
2865 :
2866 : flush_dcache_page(src_page);
2867 : flush_dcache_page(dst_page);
2868 :
2869 0 : if (memcmp(addr, dst_addr, cmp_len))
2870 : ret = BTRFS_SAME_DATA_DIFFERS;
2871 :
2872 : kunmap_atomic(addr);
2873 : kunmap_atomic(dst_addr);
2874 0 : page_cache_release(src_page);
2875 0 : page_cache_release(dst_page);
2876 :
2877 0 : if (ret)
2878 : break;
2879 :
2880 0 : loff += cmp_len;
2881 0 : dst_loff += cmp_len;
2882 0 : len -= cmp_len;
2883 : }
2884 :
2885 0 : return ret;
2886 : }
2887 :
2888 : static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len)
2889 : {
2890 0 : u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize;
2891 :
2892 0 : if (off + len > inode->i_size || off + len < off)
2893 : return -EINVAL;
2894 : /* Check that we are block aligned - btrfs_clone() requires this */
2895 0 : if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs))
2896 : return -EINVAL;
2897 :
2898 : return 0;
2899 : }
2900 :
2901 0 : static int btrfs_extent_same(struct inode *src, u64 loff, u64 len,
2902 : struct inode *dst, u64 dst_loff)
2903 : {
2904 : int ret;
2905 :
2906 : /*
2907 : * btrfs_clone() can't handle extents in the same file
2908 : * yet. Once that works, we can drop this check and replace it
2909 : * with a check for the same inode, but overlapping extents.
2910 : */
2911 0 : if (src == dst)
2912 : return -EINVAL;
2913 :
2914 0 : btrfs_double_lock(src, loff, dst, dst_loff, len);
2915 :
2916 : ret = extent_same_check_offsets(src, loff, len);
2917 0 : if (ret)
2918 : goto out_unlock;
2919 :
2920 : ret = extent_same_check_offsets(dst, dst_loff, len);
2921 0 : if (ret)
2922 : goto out_unlock;
2923 :
2924 : /* don't make the dst file partly checksummed */
2925 0 : if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
2926 0 : (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) {
2927 : ret = -EINVAL;
2928 : goto out_unlock;
2929 : }
2930 :
2931 0 : ret = btrfs_cmp_data(src, loff, dst, dst_loff, len);
2932 0 : if (ret == 0)
2933 0 : ret = btrfs_clone(src, dst, loff, len, len, dst_loff);
2934 :
2935 : out_unlock:
2936 0 : btrfs_double_unlock(src, loff, dst, dst_loff, len);
2937 :
2938 0 : return ret;
2939 : }
2940 :
2941 : #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024)
2942 :
2943 0 : static long btrfs_ioctl_file_extent_same(struct file *file,
2944 : struct btrfs_ioctl_same_args __user *argp)
2945 : {
2946 : struct btrfs_ioctl_same_args *same;
2947 : struct btrfs_ioctl_same_extent_info *info;
2948 : struct inode *src = file_inode(file);
2949 : u64 off;
2950 : u64 len;
2951 : int i;
2952 : int ret;
2953 : unsigned long size;
2954 0 : u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
2955 0 : bool is_admin = capable(CAP_SYS_ADMIN);
2956 : u16 count;
2957 :
2958 0 : if (!(file->f_mode & FMODE_READ))
2959 : return -EINVAL;
2960 :
2961 0 : ret = mnt_want_write_file(file);
2962 0 : if (ret)
2963 0 : return ret;
2964 :
2965 0 : if (get_user(count, &argp->dest_count)) {
2966 : ret = -EFAULT;
2967 : goto out;
2968 : }
2969 :
2970 0 : size = offsetof(struct btrfs_ioctl_same_args __user, info[count]);
2971 :
2972 0 : same = memdup_user(argp, size);
2973 :
2974 0 : if (IS_ERR(same)) {
2975 0 : ret = PTR_ERR(same);
2976 0 : goto out;
2977 : }
2978 :
2979 0 : off = same->logical_offset;
2980 0 : len = same->length;
2981 :
2982 : /*
2983 : * Limit the total length we will dedupe for each operation.
2984 : * This is intended to bound the total time spent in this
2985 : * ioctl to something sane.
2986 : */
2987 0 : if (len > BTRFS_MAX_DEDUPE_LEN)
2988 : len = BTRFS_MAX_DEDUPE_LEN;
2989 :
2990 0 : if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) {
2991 : /*
2992 : * Btrfs does not support blocksize < page_size. As a
2993 : * result, btrfs_cmp_data() won't correctly handle
2994 : * this situation without an update.
2995 : */
2996 : ret = -EINVAL;
2997 : goto out;
2998 : }
2999 :
3000 : ret = -EISDIR;
3001 0 : if (S_ISDIR(src->i_mode))
3002 : goto out;
3003 :
3004 : ret = -EACCES;
3005 0 : if (!S_ISREG(src->i_mode))
3006 : goto out;
3007 :
3008 : /* pre-format output fields to sane values */
3009 0 : for (i = 0; i < count; i++) {
3010 0 : same->info[i].bytes_deduped = 0ULL;
3011 0 : same->info[i].status = 0;
3012 : }
3013 :
3014 0 : for (i = 0, info = same->info; i < count; i++, info++) {
3015 : struct inode *dst;
3016 0 : struct fd dst_file = fdget(info->fd);
3017 0 : if (!dst_file.file) {
3018 0 : info->status = -EBADF;
3019 0 : continue;
3020 : }
3021 : dst = file_inode(dst_file.file);
3022 :
3023 0 : if (!(is_admin || (dst_file.file->f_mode & FMODE_WRITE))) {
3024 0 : info->status = -EINVAL;
3025 0 : } else if (file->f_path.mnt != dst_file.file->f_path.mnt) {
3026 0 : info->status = -EXDEV;
3027 0 : } else if (S_ISDIR(dst->i_mode)) {
3028 0 : info->status = -EISDIR;
3029 0 : } else if (!S_ISREG(dst->i_mode)) {
3030 0 : info->status = -EACCES;
3031 : } else {
3032 0 : info->status = btrfs_extent_same(src, off, len, dst,
3033 : info->logical_offset);
3034 0 : if (info->status == 0)
3035 0 : info->bytes_deduped += len;
3036 : }
3037 : fdput(dst_file);
3038 : }
3039 :
3040 0 : ret = copy_to_user(argp, same, size);
3041 0 : if (ret)
3042 : ret = -EFAULT;
3043 :
3044 : out:
3045 0 : mnt_drop_write_file(file);
3046 0 : return ret;
3047 : }
3048 :
3049 : /* Helper to check and see if this root currently has a ref on the given disk
3050 : * bytenr. If it does then we need to update the quota for this root. This
3051 : * doesn't do anything if quotas aren't enabled.
3052 : */
3053 9 : static int check_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3054 : u64 disko)
3055 : {
3056 9 : struct seq_list tree_mod_seq_elem = {};
3057 : struct ulist *roots;
3058 : struct ulist_iterator uiter;
3059 : struct ulist_node *root_node = NULL;
3060 : int ret;
3061 :
3062 9 : if (!root->fs_info->quota_enabled)
3063 : return 1;
3064 :
3065 0 : btrfs_get_tree_mod_seq(root->fs_info, &tree_mod_seq_elem);
3066 0 : ret = btrfs_find_all_roots(trans, root->fs_info, disko,
3067 : tree_mod_seq_elem.seq, &roots);
3068 0 : if (ret < 0)
3069 : goto out;
3070 : ret = 0;
3071 0 : ULIST_ITER_INIT(&uiter);
3072 0 : while ((root_node = ulist_next(roots, &uiter))) {
3073 0 : if (root_node->val == root->objectid) {
3074 : ret = 1;
3075 : break;
3076 : }
3077 : }
3078 0 : ulist_free(roots);
3079 : out:
3080 0 : btrfs_put_tree_mod_seq(root->fs_info, &tree_mod_seq_elem);
3081 : return ret;
3082 : }
3083 :
3084 72 : static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
3085 : struct inode *inode,
3086 : u64 endoff,
3087 : const u64 destoff,
3088 : const u64 olen)
3089 : {
3090 72 : struct btrfs_root *root = BTRFS_I(inode)->root;
3091 : int ret;
3092 :
3093 : inode_inc_iversion(inode);
3094 72 : inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3095 : /*
3096 : * We round up to the block size at eof when determining which
3097 : * extents to clone above, but shouldn't round up the file size.
3098 : */
3099 72 : if (endoff > destoff + olen)
3100 : endoff = destoff + olen;
3101 72 : if (endoff > inode->i_size)
3102 : btrfs_i_size_write(inode, endoff);
3103 :
3104 72 : ret = btrfs_update_inode(trans, root, inode);
3105 72 : if (ret) {
3106 0 : btrfs_abort_transaction(trans, root, ret);
3107 0 : btrfs_end_transaction(trans, root);
3108 0 : goto out;
3109 : }
3110 72 : ret = btrfs_end_transaction(trans, root);
3111 : out:
3112 72 : return ret;
3113 : }
3114 :
3115 74 : static void clone_update_extent_map(struct inode *inode,
3116 : const struct btrfs_trans_handle *trans,
3117 : const struct btrfs_path *path,
3118 : const u64 hole_offset,
3119 : const u64 hole_len)
3120 : {
3121 74 : struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
3122 : struct extent_map *em;
3123 : int ret;
3124 :
3125 74 : em = alloc_extent_map();
3126 74 : if (!em) {
3127 : set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3128 : &BTRFS_I(inode)->runtime_flags);
3129 74 : return;
3130 : }
3131 :
3132 74 : if (path) {
3133 : struct btrfs_file_extent_item *fi;
3134 :
3135 134 : fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
3136 : struct btrfs_file_extent_item);
3137 67 : btrfs_extent_item_to_extent_map(inode, path, fi, false, em);
3138 67 : em->generation = -1;
3139 134 : if (btrfs_file_extent_type(path->nodes[0], fi) ==
3140 : BTRFS_FILE_EXTENT_INLINE)
3141 : set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3142 : &BTRFS_I(inode)->runtime_flags);
3143 : } else {
3144 7 : em->start = hole_offset;
3145 7 : em->len = hole_len;
3146 7 : em->ram_bytes = em->len;
3147 7 : em->orig_start = hole_offset;
3148 7 : em->block_start = EXTENT_MAP_HOLE;
3149 7 : em->block_len = 0;
3150 7 : em->orig_block_len = 0;
3151 7 : em->compress_type = BTRFS_COMPRESS_NONE;
3152 7 : em->generation = trans->transid;
3153 : }
3154 :
3155 : while (1) {
3156 74 : write_lock(&em_tree->lock);
3157 74 : ret = add_extent_mapping(em_tree, em, 1);
3158 : write_unlock(&em_tree->lock);
3159 74 : if (ret != -EEXIST) {
3160 74 : free_extent_map(em);
3161 : break;
3162 : }
3163 0 : btrfs_drop_extent_cache(inode, em->start,
3164 0 : em->start + em->len - 1, 0);
3165 : }
3166 :
3167 74 : if (unlikely(ret))
3168 : set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3169 : &BTRFS_I(inode)->runtime_flags);
3170 : }
3171 :
3172 : /**
3173 : * btrfs_clone() - clone a range from inode file to another
3174 : *
3175 : * @src: Inode to clone from
3176 : * @inode: Inode to clone to
3177 : * @off: Offset within source to start clone from
3178 : * @olen: Original length, passed by user, of range to clone
3179 : * @olen_aligned: Block-aligned value of olen, extent_same uses
3180 : * identical values here
3181 : * @destoff: Offset within @inode to start clone
3182 : */
3183 54 : static int btrfs_clone(struct inode *src, struct inode *inode,
3184 : const u64 off, const u64 olen, const u64 olen_aligned,
3185 : const u64 destoff)
3186 : {
3187 54 : struct btrfs_root *root = BTRFS_I(inode)->root;
3188 : struct btrfs_path *path = NULL;
3189 : struct extent_buffer *leaf;
3190 : struct btrfs_trans_handle *trans;
3191 : char *buf = NULL;
3192 : struct btrfs_key key;
3193 : u32 nritems;
3194 : int slot;
3195 : int ret;
3196 : int no_quota;
3197 : const u64 len = olen_aligned;
3198 : u64 last_disko = 0;
3199 : u64 last_dest_end = destoff;
3200 :
3201 : ret = -ENOMEM;
3202 54 : buf = vmalloc(btrfs_level_size(root, 0));
3203 54 : if (!buf)
3204 : return ret;
3205 :
3206 54 : path = btrfs_alloc_path();
3207 54 : if (!path) {
3208 0 : vfree(buf);
3209 0 : return ret;
3210 : }
3211 :
3212 54 : path->reada = 2;
3213 : /* clone data */
3214 54 : key.objectid = btrfs_ino(src);
3215 54 : key.type = BTRFS_EXTENT_DATA_KEY;
3216 54 : key.offset = off;
3217 :
3218 : while (1) {
3219 : /*
3220 : * note the key will change type as we walk through the
3221 : * tree.
3222 : */
3223 78 : path->leave_spinning = 1;
3224 78 : ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
3225 : 0, 0);
3226 78 : if (ret < 0)
3227 : goto out;
3228 : /*
3229 : * First search, if no extent item that starts at offset off was
3230 : * found but the previous item is an extent item, it's possible
3231 : * it might overlap our target range, therefore process it.
3232 : */
3233 78 : if (key.offset == off && ret > 0 && path->slots[0] > 0) {
3234 96 : btrfs_item_key_to_cpu(path->nodes[0], &key,
3235 : path->slots[0] - 1);
3236 18 : if (key.type == BTRFS_EXTENT_DATA_KEY)
3237 16 : path->slots[0]--;
3238 : }
3239 :
3240 78 : nritems = btrfs_header_nritems(path->nodes[0]);
3241 : process_slot:
3242 : no_quota = 1;
3243 79 : if (path->slots[0] >= nritems) {
3244 5 : ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
3245 5 : if (ret < 0)
3246 : goto out;
3247 5 : if (ret > 0)
3248 : break;
3249 0 : nritems = btrfs_header_nritems(path->nodes[0]);
3250 : }
3251 74 : leaf = path->nodes[0];
3252 74 : slot = path->slots[0];
3253 :
3254 74 : btrfs_item_key_to_cpu(leaf, &key, slot);
3255 148 : if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
3256 74 : key.objectid != btrfs_ino(src))
3257 : break;
3258 :
3259 69 : if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
3260 : struct btrfs_file_extent_item *extent;
3261 : int type;
3262 : u32 size;
3263 : struct btrfs_key new_key;
3264 : u64 disko = 0, diskl = 0;
3265 : u64 datao = 0, datal = 0;
3266 : u8 comp;
3267 : u64 drop_start;
3268 :
3269 69 : extent = btrfs_item_ptr(leaf, slot,
3270 : struct btrfs_file_extent_item);
3271 : comp = btrfs_file_extent_compression(leaf, extent);
3272 69 : type = btrfs_file_extent_type(leaf, extent);
3273 69 : if (type == BTRFS_FILE_EXTENT_REG ||
3274 : type == BTRFS_FILE_EXTENT_PREALLOC) {
3275 : disko = btrfs_file_extent_disk_bytenr(leaf,
3276 : extent);
3277 : diskl = btrfs_file_extent_disk_num_bytes(leaf,
3278 : extent);
3279 : datao = btrfs_file_extent_offset(leaf, extent);
3280 : datal = btrfs_file_extent_num_bytes(leaf,
3281 : extent);
3282 6 : } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3283 : /* take upper bound, may be compressed */
3284 : datal = btrfs_file_extent_ram_bytes(leaf,
3285 : extent);
3286 : }
3287 :
3288 : /*
3289 : * The first search might have left us at an extent
3290 : * item that ends before our target range's start, can
3291 : * happen if we have holes and NO_HOLES feature enabled.
3292 : */
3293 69 : if (key.offset + datal <= off) {
3294 1 : path->slots[0]++;
3295 1 : goto process_slot;
3296 68 : } else if (key.offset >= off + len) {
3297 : break;
3298 : }
3299 :
3300 : size = btrfs_item_size_nr(leaf, slot);
3301 134 : read_extent_buffer(leaf, buf,
3302 : btrfs_item_ptr_offset(leaf, slot),
3303 : size);
3304 :
3305 67 : btrfs_release_path(path);
3306 67 : path->leave_spinning = 0;
3307 :
3308 67 : memcpy(&new_key, &key, sizeof(new_key));
3309 67 : new_key.objectid = btrfs_ino(inode);
3310 67 : if (off <= key.offset)
3311 52 : new_key.offset = key.offset + destoff - off;
3312 : else
3313 15 : new_key.offset = destoff;
3314 :
3315 : /*
3316 : * Deal with a hole that doesn't have an extent item
3317 : * that represents it (NO_HOLES feature enabled).
3318 : * This hole is either in the middle of the cloning
3319 : * range or at the beginning (fully overlaps it or
3320 : * partially overlaps it).
3321 : */
3322 67 : if (new_key.offset != last_dest_end)
3323 : drop_start = last_dest_end;
3324 : else
3325 : drop_start = new_key.offset;
3326 :
3327 : /*
3328 : * 1 - adjusting old extent (we may have to split it)
3329 : * 1 - add new extent
3330 : * 1 - inode update
3331 : */
3332 67 : trans = btrfs_start_transaction(root, 3);
3333 67 : if (IS_ERR(trans)) {
3334 0 : ret = PTR_ERR(trans);
3335 0 : goto out;
3336 : }
3337 :
3338 67 : if (type == BTRFS_FILE_EXTENT_REG ||
3339 : type == BTRFS_FILE_EXTENT_PREALLOC) {
3340 : /*
3341 : * a | --- range to clone ---| b
3342 : * | ------------- extent ------------- |
3343 : */
3344 :
3345 : /* subtract range b */
3346 61 : if (key.offset + datal > off + len)
3347 8 : datal = off + len - key.offset;
3348 :
3349 : /* subtract range a */
3350 61 : if (off > key.offset) {
3351 15 : datao += off - key.offset;
3352 15 : datal -= off - key.offset;
3353 : }
3354 :
3355 61 : ret = btrfs_drop_extents(trans, root, inode,
3356 : drop_start,
3357 61 : new_key.offset + datal,
3358 : 1);
3359 61 : if (ret) {
3360 0 : if (ret != -EOPNOTSUPP)
3361 0 : btrfs_abort_transaction(trans,
3362 : root, ret);
3363 0 : btrfs_end_transaction(trans, root);
3364 0 : goto out;
3365 : }
3366 :
3367 : ret = btrfs_insert_empty_item(trans, root, path,
3368 : &new_key, size);
3369 61 : if (ret) {
3370 0 : btrfs_abort_transaction(trans, root,
3371 : ret);
3372 0 : btrfs_end_transaction(trans, root);
3373 0 : goto out;
3374 : }
3375 :
3376 61 : leaf = path->nodes[0];
3377 61 : slot = path->slots[0];
3378 61 : write_extent_buffer(leaf, buf,
3379 : btrfs_item_ptr_offset(leaf, slot),
3380 : size);
3381 :
3382 61 : extent = btrfs_item_ptr(leaf, slot,
3383 : struct btrfs_file_extent_item);
3384 :
3385 : /* disko == 0 means it's a hole */
3386 61 : if (!disko)
3387 : datao = 0;
3388 :
3389 : btrfs_set_file_extent_offset(leaf, extent,
3390 : datao);
3391 : btrfs_set_file_extent_num_bytes(leaf, extent,
3392 : datal);
3393 :
3394 : /*
3395 : * We need to look up the roots that point at
3396 : * this bytenr and see if the new root does. If
3397 : * it does not we need to make sure we update
3398 : * quotas appropriately.
3399 : */
3400 61 : if (disko && root != BTRFS_I(src)->root &&
3401 : disko != last_disko) {
3402 9 : no_quota = check_ref(trans, root,
3403 : disko);
3404 9 : if (no_quota < 0) {
3405 0 : btrfs_abort_transaction(trans,
3406 : root,
3407 : ret);
3408 0 : btrfs_end_transaction(trans,
3409 : root);
3410 : ret = no_quota;
3411 0 : goto out;
3412 : }
3413 : }
3414 :
3415 61 : if (disko) {
3416 54 : inode_add_bytes(inode, datal);
3417 108 : ret = btrfs_inc_extent_ref(trans, root,
3418 : disko, diskl, 0,
3419 : root->root_key.objectid,
3420 : btrfs_ino(inode),
3421 54 : new_key.offset - datao,
3422 : no_quota);
3423 54 : if (ret) {
3424 0 : btrfs_abort_transaction(trans,
3425 : root,
3426 : ret);
3427 0 : btrfs_end_transaction(trans,
3428 : root);
3429 0 : goto out;
3430 :
3431 : }
3432 : }
3433 6 : } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3434 : u64 skip = 0;
3435 : u64 trim = 0;
3436 : u64 aligned_end = 0;
3437 :
3438 6 : if (off > key.offset) {
3439 0 : skip = off - key.offset;
3440 0 : new_key.offset += skip;
3441 : }
3442 :
3443 6 : if (key.offset + datal > off + len)
3444 0 : trim = key.offset + datal - (off + len);
3445 :
3446 6 : if (comp && (skip || trim)) {
3447 : ret = -EINVAL;
3448 0 : btrfs_end_transaction(trans, root);
3449 0 : goto out;
3450 : }
3451 6 : size -= skip + trim;
3452 6 : datal -= skip + trim;
3453 :
3454 6 : aligned_end = ALIGN(new_key.offset + datal,
3455 : root->sectorsize);
3456 6 : ret = btrfs_drop_extents(trans, root, inode,
3457 : drop_start,
3458 : aligned_end,
3459 : 1);
3460 6 : if (ret) {
3461 0 : if (ret != -EOPNOTSUPP)
3462 0 : btrfs_abort_transaction(trans,
3463 : root, ret);
3464 0 : btrfs_end_transaction(trans, root);
3465 0 : goto out;
3466 : }
3467 :
3468 : ret = btrfs_insert_empty_item(trans, root, path,
3469 : &new_key, size);
3470 6 : if (ret) {
3471 0 : btrfs_abort_transaction(trans, root,
3472 : ret);
3473 0 : btrfs_end_transaction(trans, root);
3474 0 : goto out;
3475 : }
3476 :
3477 6 : if (skip) {
3478 : u32 start =
3479 : btrfs_file_extent_calc_inline_size(0);
3480 0 : memmove(buf+start, buf+start+skip,
3481 : datal);
3482 : }
3483 :
3484 6 : leaf = path->nodes[0];
3485 6 : slot = path->slots[0];
3486 12 : write_extent_buffer(leaf, buf,
3487 : btrfs_item_ptr_offset(leaf, slot),
3488 : size);
3489 6 : inode_add_bytes(inode, datal);
3490 : }
3491 :
3492 : /* If we have an implicit hole (NO_HOLES feature). */
3493 67 : if (drop_start < new_key.offset)
3494 2 : clone_update_extent_map(inode, trans,
3495 : NULL, drop_start,
3496 : new_key.offset - drop_start);
3497 :
3498 67 : clone_update_extent_map(inode, trans, path, 0, 0);
3499 :
3500 67 : btrfs_mark_buffer_dirty(leaf);
3501 67 : btrfs_release_path(path);
3502 :
3503 67 : last_dest_end = ALIGN(new_key.offset + datal,
3504 : root->sectorsize);
3505 67 : ret = clone_finish_inode_update(trans, inode,
3506 : last_dest_end,
3507 : destoff, olen);
3508 67 : if (ret)
3509 : goto out;
3510 67 : if (new_key.offset + datal >= destoff + len)
3511 : break;
3512 : }
3513 24 : btrfs_release_path(path);
3514 24 : key.offset++;
3515 24 : }
3516 : ret = 0;
3517 :
3518 54 : if (last_dest_end < destoff + len) {
3519 : /*
3520 : * We have an implicit hole (NO_HOLES feature is enabled) that
3521 : * fully or partially overlaps our cloning range at its end.
3522 : */
3523 5 : btrfs_release_path(path);
3524 :
3525 : /*
3526 : * 1 - remove extent(s)
3527 : * 1 - inode update
3528 : */
3529 5 : trans = btrfs_start_transaction(root, 2);
3530 5 : if (IS_ERR(trans)) {
3531 0 : ret = PTR_ERR(trans);
3532 0 : goto out;
3533 : }
3534 5 : ret = btrfs_drop_extents(trans, root, inode,
3535 : last_dest_end, destoff + len, 1);
3536 5 : if (ret) {
3537 0 : if (ret != -EOPNOTSUPP)
3538 0 : btrfs_abort_transaction(trans, root, ret);
3539 0 : btrfs_end_transaction(trans, root);
3540 0 : goto out;
3541 : }
3542 5 : clone_update_extent_map(inode, trans, NULL, last_dest_end,
3543 : destoff + len - last_dest_end);
3544 5 : ret = clone_finish_inode_update(trans, inode, destoff + len,
3545 : destoff, olen);
3546 : }
3547 :
3548 : out:
3549 54 : btrfs_free_path(path);
3550 54 : vfree(buf);
3551 54 : return ret;
3552 : }
3553 :
3554 70 : static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
3555 : u64 off, u64 olen, u64 destoff)
3556 : {
3557 : struct inode *inode = file_inode(file);
3558 140 : struct btrfs_root *root = BTRFS_I(inode)->root;
3559 : struct fd src_file;
3560 : struct inode *src;
3561 : int ret;
3562 : u64 len = olen;
3563 70 : u64 bs = root->fs_info->sb->s_blocksize;
3564 : int same_inode = 0;
3565 :
3566 : /*
3567 : * TODO:
3568 : * - split compressed inline extents. annoying: we need to
3569 : * decompress into destination's address_space (the file offset
3570 : * may change, so source mapping won't do), then recompress (or
3571 : * otherwise reinsert) a subrange.
3572 : *
3573 : * - split destination inode's inline extents. The inline extents can
3574 : * be either compressed or non-compressed.
3575 : */
3576 :
3577 : /* the destination must be opened for writing */
3578 70 : if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND))
3579 : return -EINVAL;
3580 :
3581 70 : if (btrfs_root_readonly(root))
3582 : return -EROFS;
3583 :
3584 70 : ret = mnt_want_write_file(file);
3585 70 : if (ret)
3586 0 : return ret;
3587 :
3588 70 : src_file = fdget(srcfd);
3589 136 : if (!src_file.file) {
3590 : ret = -EBADF;
3591 : goto out_drop_write;
3592 : }
3593 :
3594 : ret = -EXDEV;
3595 70 : if (src_file.file->f_path.mnt != file->f_path.mnt)
3596 : goto out_fput;
3597 :
3598 : src = file_inode(src_file.file);
3599 :
3600 : ret = -EINVAL;
3601 66 : if (src == inode)
3602 : same_inode = 1;
3603 :
3604 : /* the src must be open for reading */
3605 66 : if (!(src_file.file->f_mode & FMODE_READ))
3606 : goto out_fput;
3607 :
3608 : /* don't make the dst file partly checksummed */
3609 132 : if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
3610 66 : (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
3611 : goto out_fput;
3612 :
3613 : ret = -EISDIR;
3614 66 : if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
3615 : goto out_fput;
3616 :
3617 : ret = -EXDEV;
3618 66 : if (src->i_sb != inode->i_sb)
3619 : goto out_fput;
3620 :
3621 66 : if (!same_inode) {
3622 36 : if (inode < src) {
3623 14 : mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
3624 14 : mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD);
3625 : } else {
3626 22 : mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT);
3627 22 : mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
3628 : }
3629 : } else {
3630 30 : mutex_lock(&src->i_mutex);
3631 : }
3632 :
3633 : /* determine range to clone */
3634 : ret = -EINVAL;
3635 66 : if (off + len > src->i_size || off + len < off)
3636 : goto out_unlock;
3637 66 : if (len == 0)
3638 15 : olen = len = src->i_size - off;
3639 : /* if we extend to eof, continue to block boundary */
3640 66 : if (off + len == src->i_size)
3641 17 : len = ALIGN(src->i_size, bs) - off;
3642 :
3643 : /* verify the end result is block aligned */
3644 132 : if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
3645 66 : !IS_ALIGNED(destoff, bs))
3646 : goto out_unlock;
3647 :
3648 : /* verify if ranges are overlapped within the same file */
3649 66 : if (same_inode) {
3650 30 : if (destoff + len > off && destoff < off + len)
3651 : goto out_unlock;
3652 : }
3653 :
3654 54 : if (destoff > inode->i_size) {
3655 1 : ret = btrfs_cont_expand(inode, inode->i_size, destoff);
3656 1 : if (ret)
3657 : goto out_unlock;
3658 : }
3659 :
3660 : /*
3661 : * Lock the target range too. Right after we replace the file extent
3662 : * items in the fs tree (which now point to the cloned data), we might
3663 : * have a worker replace them with extent items relative to a write
3664 : * operation that was issued before this clone operation (i.e. confront
3665 : * with inode.c:btrfs_finish_ordered_io).
3666 : */
3667 54 : if (same_inode) {
3668 18 : u64 lock_start = min_t(u64, off, destoff);
3669 18 : u64 lock_len = max_t(u64, off, destoff) + len - lock_start;
3670 :
3671 18 : lock_extent_range(src, lock_start, lock_len);
3672 : } else {
3673 36 : lock_extent_range(src, off, len);
3674 36 : lock_extent_range(inode, destoff, len);
3675 : }
3676 :
3677 54 : ret = btrfs_clone(src, inode, off, olen, len, destoff);
3678 :
3679 54 : if (same_inode) {
3680 18 : u64 lock_start = min_t(u64, off, destoff);
3681 18 : u64 lock_end = max_t(u64, off, destoff) + len - 1;
3682 :
3683 18 : unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end);
3684 : } else {
3685 36 : unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
3686 36 : unlock_extent(&BTRFS_I(inode)->io_tree, destoff,
3687 36 : destoff + len - 1);
3688 : }
3689 : /*
3690 : * Truncate page cache pages so that future reads will see the cloned
3691 : * data immediately and not the previous data.
3692 : */
3693 54 : truncate_inode_pages_range(&inode->i_data, destoff,
3694 54 : PAGE_CACHE_ALIGN(destoff + len) - 1);
3695 : out_unlock:
3696 66 : if (!same_inode) {
3697 36 : if (inode < src) {
3698 14 : mutex_unlock(&src->i_mutex);
3699 14 : mutex_unlock(&inode->i_mutex);
3700 : } else {
3701 22 : mutex_unlock(&inode->i_mutex);
3702 22 : mutex_unlock(&src->i_mutex);
3703 : }
3704 : } else {
3705 30 : mutex_unlock(&src->i_mutex);
3706 : }
3707 : out_fput:
3708 : fdput(src_file);
3709 : out_drop_write:
3710 70 : mnt_drop_write_file(file);
3711 70 : return ret;
3712 : }
3713 :
3714 51 : static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
3715 : {
3716 : struct btrfs_ioctl_clone_range_args args;
3717 :
3718 51 : if (copy_from_user(&args, argp, sizeof(args)))
3719 : return -EFAULT;
3720 51 : return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
3721 : args.src_length, args.dest_offset);
3722 : }
3723 :
3724 : /*
3725 : * there are many ways the trans_start and trans_end ioctls can lead
3726 : * to deadlocks. They should only be used by applications that
3727 : * basically own the machine, and have a very in depth understanding
3728 : * of all the possible deadlocks and enospc problems.
3729 : */
3730 0 : static long btrfs_ioctl_trans_start(struct file *file)
3731 : {
3732 : struct inode *inode = file_inode(file);
3733 0 : struct btrfs_root *root = BTRFS_I(inode)->root;
3734 : struct btrfs_trans_handle *trans;
3735 : int ret;
3736 :
3737 : ret = -EPERM;
3738 0 : if (!capable(CAP_SYS_ADMIN))
3739 : goto out;
3740 :
3741 : ret = -EINPROGRESS;
3742 0 : if (file->private_data)
3743 : goto out;
3744 :
3745 : ret = -EROFS;
3746 0 : if (btrfs_root_readonly(root))
3747 : goto out;
3748 :
3749 0 : ret = mnt_want_write_file(file);
3750 0 : if (ret)
3751 : goto out;
3752 :
3753 0 : atomic_inc(&root->fs_info->open_ioctl_trans);
3754 :
3755 : ret = -ENOMEM;
3756 0 : trans = btrfs_start_ioctl_transaction(root);
3757 0 : if (IS_ERR(trans))
3758 : goto out_drop;
3759 :
3760 0 : file->private_data = trans;
3761 0 : return 0;
3762 :
3763 : out_drop:
3764 0 : atomic_dec(&root->fs_info->open_ioctl_trans);
3765 0 : mnt_drop_write_file(file);
3766 : out:
3767 0 : return ret;
3768 : }
3769 :
3770 3 : static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
3771 : {
3772 : struct inode *inode = file_inode(file);
3773 3 : struct btrfs_root *root = BTRFS_I(inode)->root;
3774 : struct btrfs_root *new_root;
3775 : struct btrfs_dir_item *di;
3776 : struct btrfs_trans_handle *trans;
3777 : struct btrfs_path *path;
3778 : struct btrfs_key location;
3779 : struct btrfs_disk_key disk_key;
3780 3 : u64 objectid = 0;
3781 : u64 dir_id;
3782 : int ret;
3783 :
3784 3 : if (!capable(CAP_SYS_ADMIN))
3785 : return -EPERM;
3786 :
3787 3 : ret = mnt_want_write_file(file);
3788 3 : if (ret)
3789 0 : return ret;
3790 :
3791 3 : if (copy_from_user(&objectid, argp, sizeof(objectid))) {
3792 : ret = -EFAULT;
3793 : goto out;
3794 : }
3795 :
3796 3 : if (!objectid)
3797 1 : objectid = BTRFS_FS_TREE_OBJECTID;
3798 :
3799 3 : location.objectid = objectid;
3800 3 : location.type = BTRFS_ROOT_ITEM_KEY;
3801 3 : location.offset = (u64)-1;
3802 :
3803 3 : new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
3804 3 : if (IS_ERR(new_root)) {
3805 0 : ret = PTR_ERR(new_root);
3806 0 : goto out;
3807 : }
3808 :
3809 3 : path = btrfs_alloc_path();
3810 3 : if (!path) {
3811 : ret = -ENOMEM;
3812 : goto out;
3813 : }
3814 3 : path->leave_spinning = 1;
3815 :
3816 3 : trans = btrfs_start_transaction(root, 1);
3817 3 : if (IS_ERR(trans)) {
3818 0 : btrfs_free_path(path);
3819 0 : ret = PTR_ERR(trans);
3820 0 : goto out;
3821 : }
3822 :
3823 3 : dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
3824 3 : di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
3825 : dir_id, "default", 7, 1);
3826 3 : if (IS_ERR_OR_NULL(di)) {
3827 0 : btrfs_free_path(path);
3828 0 : btrfs_end_transaction(trans, root);
3829 0 : btrfs_err(new_root->fs_info, "Umm, you don't have the default dir"
3830 : "item, this isn't going to work");
3831 : ret = -ENOENT;
3832 0 : goto out;
3833 : }
3834 :
3835 : btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
3836 3 : btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
3837 3 : btrfs_mark_buffer_dirty(path->nodes[0]);
3838 3 : btrfs_free_path(path);
3839 :
3840 3 : btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
3841 3 : btrfs_end_transaction(trans, root);
3842 : out:
3843 3 : mnt_drop_write_file(file);
3844 3 : return ret;
3845 : }
3846 :
3847 1090 : void btrfs_get_block_group_info(struct list_head *groups_list,
3848 : struct btrfs_ioctl_space_info *space)
3849 : {
3850 : struct btrfs_block_group_cache *block_group;
3851 :
3852 1138 : space->total_bytes = 0;
3853 1138 : space->used_bytes = 0;
3854 1138 : space->flags = 0;
3855 2327 : list_for_each_entry(block_group, groups_list, list) {
3856 1189 : space->flags = block_group->flags;
3857 1189 : space->total_bytes += block_group->key.offset;
3858 2378 : space->used_bytes +=
3859 : btrfs_block_group_used(&block_group->item);
3860 : }
3861 1090 : }
3862 :
3863 16 : static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
3864 : {
3865 : struct btrfs_ioctl_space_args space_args;
3866 : struct btrfs_ioctl_space_info space;
3867 : struct btrfs_ioctl_space_info *dest;
3868 : struct btrfs_ioctl_space_info *dest_orig;
3869 : struct btrfs_ioctl_space_info __user *user_dest;
3870 : struct btrfs_space_info *info;
3871 16 : u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
3872 : BTRFS_BLOCK_GROUP_SYSTEM,
3873 : BTRFS_BLOCK_GROUP_METADATA,
3874 : BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
3875 : int num_types = 4;
3876 : int alloc_size;
3877 : int ret = 0;
3878 : u64 slot_count = 0;
3879 : int i, c;
3880 :
3881 16 : if (copy_from_user(&space_args,
3882 : (struct btrfs_ioctl_space_args __user *)arg,
3883 : sizeof(space_args)))
3884 : return -EFAULT;
3885 :
3886 64 : for (i = 0; i < num_types; i++) {
3887 : struct btrfs_space_info *tmp;
3888 :
3889 : info = NULL;
3890 : rcu_read_lock();
3891 160 : list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3892 : list) {
3893 144 : if (tmp->flags == types[i]) {
3894 : info = tmp;
3895 : break;
3896 : }
3897 : }
3898 : rcu_read_unlock();
3899 :
3900 64 : if (!info)
3901 16 : continue;
3902 :
3903 48 : down_read(&info->groups_sem);
3904 336 : for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3905 672 : if (!list_empty(&info->block_groups[c]))
3906 96 : slot_count++;
3907 : }
3908 48 : up_read(&info->groups_sem);
3909 : }
3910 :
3911 : /*
3912 : * Global block reserve, exported as a space_info
3913 : */
3914 16 : slot_count++;
3915 :
3916 : /* space_slots == 0 means they are asking for a count */
3917 16 : if (space_args.space_slots == 0) {
3918 8 : space_args.total_spaces = slot_count;
3919 : goto out;
3920 : }
3921 :
3922 8 : slot_count = min_t(u64, space_args.space_slots, slot_count);
3923 :
3924 8 : alloc_size = sizeof(*dest) * slot_count;
3925 :
3926 : /* we generally have at most 6 or so space infos, one for each raid
3927 : * level. So, a whole page should be more than enough for everyone
3928 : */
3929 8 : if (alloc_size > PAGE_CACHE_SIZE)
3930 : return -ENOMEM;
3931 :
3932 8 : space_args.total_spaces = 0;
3933 8 : dest = kmalloc(alloc_size, GFP_NOFS);
3934 8 : if (!dest)
3935 : return -ENOMEM;
3936 : dest_orig = dest;
3937 :
3938 : /* now we have a buffer to copy into */
3939 32 : for (i = 0; i < num_types; i++) {
3940 : struct btrfs_space_info *tmp;
3941 :
3942 32 : if (!slot_count)
3943 : break;
3944 :
3945 : info = NULL;
3946 : rcu_read_lock();
3947 80 : list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3948 : list) {
3949 72 : if (tmp->flags == types[i]) {
3950 : info = tmp;
3951 : break;
3952 : }
3953 : }
3954 : rcu_read_unlock();
3955 :
3956 32 : if (!info)
3957 8 : continue;
3958 24 : down_read(&info->groups_sem);
3959 168 : for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3960 336 : if (!list_empty(&info->block_groups[c])) {
3961 : btrfs_get_block_group_info(
3962 : &info->block_groups[c], &space);
3963 48 : memcpy(dest, &space, sizeof(space));
3964 48 : dest++;
3965 48 : space_args.total_spaces++;
3966 48 : slot_count--;
3967 : }
3968 168 : if (!slot_count)
3969 : break;
3970 : }
3971 24 : up_read(&info->groups_sem);
3972 : }
3973 :
3974 : /*
3975 : * Add global block reserve
3976 : */
3977 8 : if (slot_count) {
3978 8 : struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv;
3979 :
3980 : spin_lock(&block_rsv->lock);
3981 8 : space.total_bytes = block_rsv->size;
3982 8 : space.used_bytes = block_rsv->size - block_rsv->reserved;
3983 : spin_unlock(&block_rsv->lock);
3984 8 : space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
3985 8 : memcpy(dest, &space, sizeof(space));
3986 8 : space_args.total_spaces++;
3987 : }
3988 :
3989 8 : user_dest = (struct btrfs_ioctl_space_info __user *)
3990 : (arg + sizeof(struct btrfs_ioctl_space_args));
3991 :
3992 8 : if (copy_to_user(user_dest, dest_orig, alloc_size))
3993 : ret = -EFAULT;
3994 :
3995 8 : kfree(dest_orig);
3996 : out:
3997 32 : if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
3998 : ret = -EFAULT;
3999 :
4000 16 : return ret;
4001 : }
4002 :
4003 : /*
4004 : * there are many ways the trans_start and trans_end ioctls can lead
4005 : * to deadlocks. They should only be used by applications that
4006 : * basically own the machine, and have a very in depth understanding
4007 : * of all the possible deadlocks and enospc problems.
4008 : */
4009 0 : long btrfs_ioctl_trans_end(struct file *file)
4010 : {
4011 : struct inode *inode = file_inode(file);
4012 0 : struct btrfs_root *root = BTRFS_I(inode)->root;
4013 : struct btrfs_trans_handle *trans;
4014 :
4015 0 : trans = file->private_data;
4016 0 : if (!trans)
4017 : return -EINVAL;
4018 0 : file->private_data = NULL;
4019 :
4020 0 : btrfs_end_transaction(trans, root);
4021 :
4022 0 : atomic_dec(&root->fs_info->open_ioctl_trans);
4023 :
4024 0 : mnt_drop_write_file(file);
4025 0 : return 0;
4026 : }
4027 :
4028 0 : static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
4029 : void __user *argp)
4030 : {
4031 : struct btrfs_trans_handle *trans;
4032 : u64 transid;
4033 : int ret;
4034 :
4035 0 : trans = btrfs_attach_transaction_barrier(root);
4036 0 : if (IS_ERR(trans)) {
4037 0 : if (PTR_ERR(trans) != -ENOENT)
4038 : return PTR_ERR(trans);
4039 :
4040 : /* No running transaction, don't bother */
4041 0 : transid = root->fs_info->last_trans_committed;
4042 0 : goto out;
4043 : }
4044 0 : transid = trans->transid;
4045 0 : ret = btrfs_commit_transaction_async(trans, root, 0);
4046 0 : if (ret) {
4047 0 : btrfs_end_transaction(trans, root);
4048 0 : return ret;
4049 : }
4050 : out:
4051 0 : if (argp)
4052 0 : if (copy_to_user(argp, &transid, sizeof(transid)))
4053 : return -EFAULT;
4054 : return 0;
4055 : }
4056 :
4057 0 : static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
4058 : void __user *argp)
4059 : {
4060 : u64 transid;
4061 :
4062 0 : if (argp) {
4063 0 : if (copy_from_user(&transid, argp, sizeof(transid)))
4064 : return -EFAULT;
4065 : } else {
4066 0 : transid = 0; /* current trans */
4067 : }
4068 0 : return btrfs_wait_for_commit(root, transid);
4069 : }
4070 :
4071 11 : static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
4072 : {
4073 11 : struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4074 : struct btrfs_ioctl_scrub_args *sa;
4075 : int ret;
4076 :
4077 11 : if (!capable(CAP_SYS_ADMIN))
4078 : return -EPERM;
4079 :
4080 11 : sa = memdup_user(arg, sizeof(*sa));
4081 11 : if (IS_ERR(sa))
4082 0 : return PTR_ERR(sa);
4083 :
4084 11 : if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
4085 11 : ret = mnt_want_write_file(file);
4086 11 : if (ret)
4087 : goto out;
4088 : }
4089 :
4090 11 : ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
4091 11 : &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
4092 : 0);
4093 :
4094 11 : if (copy_to_user(arg, sa, sizeof(*sa)))
4095 : ret = -EFAULT;
4096 :
4097 11 : if (!(sa->flags & BTRFS_SCRUB_READONLY))
4098 11 : mnt_drop_write_file(file);
4099 : out:
4100 11 : kfree(sa);
4101 11 : return ret;
4102 : }
4103 :
4104 0 : static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
4105 : {
4106 0 : if (!capable(CAP_SYS_ADMIN))
4107 : return -EPERM;
4108 :
4109 0 : return btrfs_scrub_cancel(root->fs_info);
4110 : }
4111 :
4112 12 : static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
4113 : void __user *arg)
4114 : {
4115 : struct btrfs_ioctl_scrub_args *sa;
4116 : int ret;
4117 :
4118 12 : if (!capable(CAP_SYS_ADMIN))
4119 : return -EPERM;
4120 :
4121 12 : sa = memdup_user(arg, sizeof(*sa));
4122 12 : if (IS_ERR(sa))
4123 0 : return PTR_ERR(sa);
4124 :
4125 12 : ret = btrfs_scrub_progress(root, sa->devid, &sa->progress);
4126 :
4127 12 : if (copy_to_user(arg, sa, sizeof(*sa)))
4128 : ret = -EFAULT;
4129 :
4130 12 : kfree(sa);
4131 12 : return ret;
4132 : }
4133 :
4134 10 : static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
4135 : void __user *arg)
4136 : {
4137 : struct btrfs_ioctl_get_dev_stats *sa;
4138 : int ret;
4139 :
4140 10 : sa = memdup_user(arg, sizeof(*sa));
4141 10 : if (IS_ERR(sa))
4142 0 : return PTR_ERR(sa);
4143 :
4144 10 : if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
4145 0 : kfree(sa);
4146 0 : return -EPERM;
4147 : }
4148 :
4149 10 : ret = btrfs_get_dev_stats(root, sa);
4150 :
4151 10 : if (copy_to_user(arg, sa, sizeof(*sa)))
4152 : ret = -EFAULT;
4153 :
4154 10 : kfree(sa);
4155 10 : return ret;
4156 : }
4157 :
4158 25 : static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg)
4159 : {
4160 : struct btrfs_ioctl_dev_replace_args *p;
4161 : int ret;
4162 :
4163 25 : if (!capable(CAP_SYS_ADMIN))
4164 : return -EPERM;
4165 :
4166 25 : p = memdup_user(arg, sizeof(*p));
4167 25 : if (IS_ERR(p))
4168 0 : return PTR_ERR(p);
4169 :
4170 25 : switch (p->cmd) {
4171 : case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
4172 8 : if (root->fs_info->sb->s_flags & MS_RDONLY) {
4173 : ret = -EROFS;
4174 : goto out;
4175 : }
4176 16 : if (atomic_xchg(
4177 : &root->fs_info->mutually_exclusive_operation_running,
4178 : 1)) {
4179 : ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4180 : } else {
4181 8 : ret = btrfs_dev_replace_start(root, p);
4182 : atomic_set(
4183 8 : &root->fs_info->mutually_exclusive_operation_running,
4184 : 0);
4185 : }
4186 : break;
4187 : case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
4188 16 : btrfs_dev_replace_status(root->fs_info, p);
4189 : ret = 0;
4190 16 : break;
4191 : case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
4192 1 : ret = btrfs_dev_replace_cancel(root->fs_info, p);
4193 1 : break;
4194 : default:
4195 : ret = -EINVAL;
4196 : break;
4197 : }
4198 :
4199 25 : if (copy_to_user(arg, p, sizeof(*p)))
4200 : ret = -EFAULT;
4201 : out:
4202 25 : kfree(p);
4203 25 : return ret;
4204 : }
4205 :
4206 463 : static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
4207 : {
4208 : int ret = 0;
4209 : int i;
4210 : u64 rel_ptr;
4211 : int size;
4212 : struct btrfs_ioctl_ino_path_args *ipa = NULL;
4213 : struct inode_fs_paths *ipath = NULL;
4214 : struct btrfs_path *path;
4215 :
4216 463 : if (!capable(CAP_DAC_READ_SEARCH))
4217 : return -EPERM;
4218 :
4219 463 : path = btrfs_alloc_path();
4220 463 : if (!path) {
4221 : ret = -ENOMEM;
4222 : goto out;
4223 : }
4224 :
4225 463 : ipa = memdup_user(arg, sizeof(*ipa));
4226 463 : if (IS_ERR(ipa)) {
4227 0 : ret = PTR_ERR(ipa);
4228 : ipa = NULL;
4229 0 : goto out;
4230 : }
4231 :
4232 463 : size = min_t(u32, ipa->size, 4096);
4233 463 : ipath = init_ipath(size, root, path);
4234 463 : if (IS_ERR(ipath)) {
4235 0 : ret = PTR_ERR(ipath);
4236 : ipath = NULL;
4237 0 : goto out;
4238 : }
4239 :
4240 463 : ret = paths_from_inode(ipa->inum, ipath);
4241 463 : if (ret < 0)
4242 : goto out;
4243 :
4244 735 : for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
4245 1470 : rel_ptr = ipath->fspath->val[i] -
4246 735 : (u64)(unsigned long)ipath->fspath->val;
4247 735 : ipath->fspath->val[i] = rel_ptr;
4248 : }
4249 :
4250 926 : ret = copy_to_user((void *)(unsigned long)ipa->fspath,
4251 : (void *)(unsigned long)ipath->fspath, size);
4252 463 : if (ret) {
4253 : ret = -EFAULT;
4254 0 : goto out;
4255 : }
4256 :
4257 : out:
4258 463 : btrfs_free_path(path);
4259 463 : free_ipath(ipath);
4260 463 : kfree(ipa);
4261 :
4262 463 : return ret;
4263 : }
4264 :
4265 926 : static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
4266 : {
4267 : struct btrfs_data_container *inodes = ctx;
4268 : const size_t c = 3 * sizeof(u64);
4269 :
4270 926 : if (inodes->bytes_left >= c) {
4271 926 : inodes->bytes_left -= c;
4272 926 : inodes->val[inodes->elem_cnt] = inum;
4273 926 : inodes->val[inodes->elem_cnt + 1] = offset;
4274 926 : inodes->val[inodes->elem_cnt + 2] = root;
4275 926 : inodes->elem_cnt += 3;
4276 : } else {
4277 0 : inodes->bytes_missing += c - inodes->bytes_left;
4278 0 : inodes->bytes_left = 0;
4279 0 : inodes->elem_missed += 3;
4280 : }
4281 :
4282 926 : return 0;
4283 : }
4284 :
4285 463 : static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
4286 : void __user *arg)
4287 : {
4288 : int ret = 0;
4289 : int size;
4290 : struct btrfs_ioctl_logical_ino_args *loi;
4291 : struct btrfs_data_container *inodes = NULL;
4292 : struct btrfs_path *path = NULL;
4293 :
4294 463 : if (!capable(CAP_SYS_ADMIN))
4295 : return -EPERM;
4296 :
4297 463 : loi = memdup_user(arg, sizeof(*loi));
4298 463 : if (IS_ERR(loi)) {
4299 0 : ret = PTR_ERR(loi);
4300 : loi = NULL;
4301 : goto out;
4302 : }
4303 :
4304 463 : path = btrfs_alloc_path();
4305 463 : if (!path) {
4306 : ret = -ENOMEM;
4307 : goto out;
4308 : }
4309 :
4310 463 : size = min_t(u32, loi->size, 64 * 1024);
4311 463 : inodes = init_data_container(size);
4312 463 : if (IS_ERR(inodes)) {
4313 0 : ret = PTR_ERR(inodes);
4314 : inodes = NULL;
4315 : goto out;
4316 : }
4317 :
4318 463 : ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
4319 : build_ino_list, inodes);
4320 463 : if (ret == -EINVAL)
4321 : ret = -ENOENT;
4322 463 : if (ret < 0)
4323 : goto out;
4324 :
4325 926 : ret = copy_to_user((void *)(unsigned long)loi->inodes,
4326 : (void *)(unsigned long)inodes, size);
4327 463 : if (ret)
4328 : ret = -EFAULT;
4329 :
4330 : out:
4331 463 : btrfs_free_path(path);
4332 463 : vfree(inodes);
4333 463 : kfree(loi);
4334 :
4335 463 : return ret;
4336 : }
4337 :
4338 22 : void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
4339 : struct btrfs_ioctl_balance_args *bargs)
4340 : {
4341 22 : struct btrfs_balance_control *bctl = fs_info->balance_ctl;
4342 :
4343 22 : bargs->flags = bctl->flags;
4344 :
4345 22 : if (atomic_read(&fs_info->balance_running))
4346 0 : bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
4347 22 : if (atomic_read(&fs_info->balance_pause_req))
4348 0 : bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
4349 22 : if (atomic_read(&fs_info->balance_cancel_req))
4350 0 : bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
4351 :
4352 22 : memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
4353 22 : memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
4354 22 : memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
4355 :
4356 22 : if (lock) {
4357 : spin_lock(&fs_info->balance_lock);
4358 0 : memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4359 : spin_unlock(&fs_info->balance_lock);
4360 : } else {
4361 22 : memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4362 : }
4363 22 : }
4364 :
4365 22 : static long btrfs_ioctl_balance(struct file *file, void __user *arg)
4366 : {
4367 22 : struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4368 22 : struct btrfs_fs_info *fs_info = root->fs_info;
4369 : struct btrfs_ioctl_balance_args *bargs;
4370 : struct btrfs_balance_control *bctl;
4371 : bool need_unlock; /* for mut. excl. ops lock */
4372 : int ret;
4373 :
4374 22 : if (!capable(CAP_SYS_ADMIN))
4375 : return -EPERM;
4376 :
4377 22 : ret = mnt_want_write_file(file);
4378 22 : if (ret)
4379 0 : return ret;
4380 :
4381 : again:
4382 44 : if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) {
4383 22 : mutex_lock(&fs_info->volume_mutex);
4384 22 : mutex_lock(&fs_info->balance_mutex);
4385 : need_unlock = true;
4386 22 : goto locked;
4387 : }
4388 :
4389 : /*
4390 : * mut. excl. ops lock is locked. Three possibilites:
4391 : * (1) some other op is running
4392 : * (2) balance is running
4393 : * (3) balance is paused -- special case (think resume)
4394 : */
4395 0 : mutex_lock(&fs_info->balance_mutex);
4396 0 : if (fs_info->balance_ctl) {
4397 : /* this is either (2) or (3) */
4398 0 : if (!atomic_read(&fs_info->balance_running)) {
4399 0 : mutex_unlock(&fs_info->balance_mutex);
4400 0 : if (!mutex_trylock(&fs_info->volume_mutex))
4401 : goto again;
4402 0 : mutex_lock(&fs_info->balance_mutex);
4403 :
4404 0 : if (fs_info->balance_ctl &&
4405 : !atomic_read(&fs_info->balance_running)) {
4406 : /* this is (3) */
4407 : need_unlock = false;
4408 : goto locked;
4409 : }
4410 :
4411 0 : mutex_unlock(&fs_info->balance_mutex);
4412 0 : mutex_unlock(&fs_info->volume_mutex);
4413 0 : goto again;
4414 : } else {
4415 : /* this is (2) */
4416 0 : mutex_unlock(&fs_info->balance_mutex);
4417 : ret = -EINPROGRESS;
4418 0 : goto out;
4419 : }
4420 : } else {
4421 : /* this is (1) */
4422 0 : mutex_unlock(&fs_info->balance_mutex);
4423 : ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4424 0 : goto out;
4425 : }
4426 :
4427 : locked:
4428 22 : BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
4429 :
4430 22 : if (arg) {
4431 22 : bargs = memdup_user(arg, sizeof(*bargs));
4432 22 : if (IS_ERR(bargs)) {
4433 0 : ret = PTR_ERR(bargs);
4434 0 : goto out_unlock;
4435 : }
4436 :
4437 22 : if (bargs->flags & BTRFS_BALANCE_RESUME) {
4438 0 : if (!fs_info->balance_ctl) {
4439 : ret = -ENOTCONN;
4440 : goto out_bargs;
4441 : }
4442 :
4443 : bctl = fs_info->balance_ctl;
4444 : spin_lock(&fs_info->balance_lock);
4445 0 : bctl->flags |= BTRFS_BALANCE_RESUME;
4446 : spin_unlock(&fs_info->balance_lock);
4447 :
4448 : goto do_balance;
4449 : }
4450 : } else {
4451 : bargs = NULL;
4452 : }
4453 :
4454 22 : if (fs_info->balance_ctl) {
4455 : ret = -EINPROGRESS;
4456 : goto out_bargs;
4457 : }
4458 :
4459 22 : bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
4460 22 : if (!bctl) {
4461 : ret = -ENOMEM;
4462 : goto out_bargs;
4463 : }
4464 :
4465 22 : bctl->fs_info = fs_info;
4466 22 : if (arg) {
4467 22 : memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
4468 22 : memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
4469 22 : memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
4470 :
4471 22 : bctl->flags = bargs->flags;
4472 : } else {
4473 : /* balance everything - no filters */
4474 0 : bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
4475 : }
4476 :
4477 : do_balance:
4478 : /*
4479 : * Ownership of bctl and mutually_exclusive_operation_running
4480 : * goes to to btrfs_balance. bctl is freed in __cancel_balance,
4481 : * or, if restriper was paused all the way until unmount, in
4482 : * free_fs_info. mutually_exclusive_operation_running is
4483 : * cleared in __cancel_balance.
4484 : */
4485 : need_unlock = false;
4486 :
4487 22 : ret = btrfs_balance(bctl, bargs);
4488 :
4489 22 : if (arg) {
4490 22 : if (copy_to_user(arg, bargs, sizeof(*bargs)))
4491 : ret = -EFAULT;
4492 : }
4493 :
4494 : out_bargs:
4495 22 : kfree(bargs);
4496 : out_unlock:
4497 22 : mutex_unlock(&fs_info->balance_mutex);
4498 22 : mutex_unlock(&fs_info->volume_mutex);
4499 22 : if (need_unlock)
4500 : atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
4501 : out:
4502 22 : mnt_drop_write_file(file);
4503 22 : return ret;
4504 : }
4505 :
4506 0 : static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd)
4507 : {
4508 0 : if (!capable(CAP_SYS_ADMIN))
4509 : return -EPERM;
4510 :
4511 0 : switch (cmd) {
4512 : case BTRFS_BALANCE_CTL_PAUSE:
4513 0 : return btrfs_pause_balance(root->fs_info);
4514 : case BTRFS_BALANCE_CTL_CANCEL:
4515 0 : return btrfs_cancel_balance(root->fs_info);
4516 : }
4517 :
4518 : return -EINVAL;
4519 : }
4520 :
4521 0 : static long btrfs_ioctl_balance_progress(struct btrfs_root *root,
4522 : void __user *arg)
4523 : {
4524 0 : struct btrfs_fs_info *fs_info = root->fs_info;
4525 : struct btrfs_ioctl_balance_args *bargs;
4526 : int ret = 0;
4527 :
4528 0 : if (!capable(CAP_SYS_ADMIN))
4529 : return -EPERM;
4530 :
4531 0 : mutex_lock(&fs_info->balance_mutex);
4532 0 : if (!fs_info->balance_ctl) {
4533 : ret = -ENOTCONN;
4534 : goto out;
4535 : }
4536 :
4537 0 : bargs = kzalloc(sizeof(*bargs), GFP_NOFS);
4538 0 : if (!bargs) {
4539 : ret = -ENOMEM;
4540 : goto out;
4541 : }
4542 :
4543 0 : update_ioctl_balance_args(fs_info, 1, bargs);
4544 :
4545 0 : if (copy_to_user(arg, bargs, sizeof(*bargs)))
4546 : ret = -EFAULT;
4547 :
4548 0 : kfree(bargs);
4549 : out:
4550 0 : mutex_unlock(&fs_info->balance_mutex);
4551 0 : return ret;
4552 : }
4553 :
4554 6 : static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
4555 : {
4556 6 : struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4557 : struct btrfs_ioctl_quota_ctl_args *sa;
4558 : struct btrfs_trans_handle *trans = NULL;
4559 : int ret;
4560 : int err;
4561 :
4562 6 : if (!capable(CAP_SYS_ADMIN))
4563 : return -EPERM;
4564 :
4565 6 : ret = mnt_want_write_file(file);
4566 6 : if (ret)
4567 0 : return ret;
4568 :
4569 6 : sa = memdup_user(arg, sizeof(*sa));
4570 6 : if (IS_ERR(sa)) {
4571 0 : ret = PTR_ERR(sa);
4572 0 : goto drop_write;
4573 : }
4574 :
4575 6 : down_write(&root->fs_info->subvol_sem);
4576 6 : trans = btrfs_start_transaction(root->fs_info->tree_root, 2);
4577 6 : if (IS_ERR(trans)) {
4578 0 : ret = PTR_ERR(trans);
4579 0 : goto out;
4580 : }
4581 :
4582 6 : switch (sa->cmd) {
4583 : case BTRFS_QUOTA_CTL_ENABLE:
4584 6 : ret = btrfs_quota_enable(trans, root->fs_info);
4585 6 : break;
4586 : case BTRFS_QUOTA_CTL_DISABLE:
4587 0 : ret = btrfs_quota_disable(trans, root->fs_info);
4588 0 : break;
4589 : default:
4590 : ret = -EINVAL;
4591 : break;
4592 : }
4593 :
4594 6 : err = btrfs_commit_transaction(trans, root->fs_info->tree_root);
4595 6 : if (err && !ret)
4596 : ret = err;
4597 : out:
4598 6 : kfree(sa);
4599 6 : up_write(&root->fs_info->subvol_sem);
4600 : drop_write:
4601 6 : mnt_drop_write_file(file);
4602 6 : return ret;
4603 : }
4604 :
4605 0 : static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
4606 : {
4607 0 : struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4608 : struct btrfs_ioctl_qgroup_assign_args *sa;
4609 : struct btrfs_trans_handle *trans;
4610 : int ret;
4611 : int err;
4612 :
4613 0 : if (!capable(CAP_SYS_ADMIN))
4614 : return -EPERM;
4615 :
4616 0 : ret = mnt_want_write_file(file);
4617 0 : if (ret)
4618 0 : return ret;
4619 :
4620 0 : sa = memdup_user(arg, sizeof(*sa));
4621 0 : if (IS_ERR(sa)) {
4622 0 : ret = PTR_ERR(sa);
4623 0 : goto drop_write;
4624 : }
4625 :
4626 0 : trans = btrfs_join_transaction(root);
4627 0 : if (IS_ERR(trans)) {
4628 0 : ret = PTR_ERR(trans);
4629 0 : goto out;
4630 : }
4631 :
4632 : /* FIXME: check if the IDs really exist */
4633 0 : if (sa->assign) {
4634 0 : ret = btrfs_add_qgroup_relation(trans, root->fs_info,
4635 : sa->src, sa->dst);
4636 : } else {
4637 0 : ret = btrfs_del_qgroup_relation(trans, root->fs_info,
4638 : sa->src, sa->dst);
4639 : }
4640 :
4641 0 : err = btrfs_end_transaction(trans, root);
4642 0 : if (err && !ret)
4643 : ret = err;
4644 :
4645 : out:
4646 0 : kfree(sa);
4647 : drop_write:
4648 0 : mnt_drop_write_file(file);
4649 0 : return ret;
4650 : }
4651 :
4652 1 : static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
4653 : {
4654 1 : struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4655 : struct btrfs_ioctl_qgroup_create_args *sa;
4656 : struct btrfs_trans_handle *trans;
4657 : int ret;
4658 : int err;
4659 :
4660 1 : if (!capable(CAP_SYS_ADMIN))
4661 : return -EPERM;
4662 :
4663 1 : ret = mnt_want_write_file(file);
4664 1 : if (ret)
4665 0 : return ret;
4666 :
4667 1 : sa = memdup_user(arg, sizeof(*sa));
4668 1 : if (IS_ERR(sa)) {
4669 0 : ret = PTR_ERR(sa);
4670 0 : goto drop_write;
4671 : }
4672 :
4673 1 : if (!sa->qgroupid) {
4674 : ret = -EINVAL;
4675 : goto out;
4676 : }
4677 :
4678 1 : trans = btrfs_join_transaction(root);
4679 1 : if (IS_ERR(trans)) {
4680 0 : ret = PTR_ERR(trans);
4681 0 : goto out;
4682 : }
4683 :
4684 : /* FIXME: check if the IDs really exist */
4685 1 : if (sa->create) {
4686 1 : ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid,
4687 : NULL);
4688 : } else {
4689 0 : ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
4690 : }
4691 :
4692 1 : err = btrfs_end_transaction(trans, root);
4693 1 : if (err && !ret)
4694 : ret = err;
4695 :
4696 : out:
4697 1 : kfree(sa);
4698 : drop_write:
4699 1 : mnt_drop_write_file(file);
4700 1 : return ret;
4701 : }
4702 :
4703 3 : static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
4704 : {
4705 3 : struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4706 : struct btrfs_ioctl_qgroup_limit_args *sa;
4707 : struct btrfs_trans_handle *trans;
4708 : int ret;
4709 : int err;
4710 : u64 qgroupid;
4711 :
4712 3 : if (!capable(CAP_SYS_ADMIN))
4713 : return -EPERM;
4714 :
4715 3 : ret = mnt_want_write_file(file);
4716 3 : if (ret)
4717 0 : return ret;
4718 :
4719 3 : sa = memdup_user(arg, sizeof(*sa));
4720 3 : if (IS_ERR(sa)) {
4721 0 : ret = PTR_ERR(sa);
4722 0 : goto drop_write;
4723 : }
4724 :
4725 3 : trans = btrfs_join_transaction(root);
4726 3 : if (IS_ERR(trans)) {
4727 0 : ret = PTR_ERR(trans);
4728 0 : goto out;
4729 : }
4730 :
4731 3 : qgroupid = sa->qgroupid;
4732 3 : if (!qgroupid) {
4733 : /* take the current subvol as qgroup */
4734 0 : qgroupid = root->root_key.objectid;
4735 : }
4736 :
4737 : /* FIXME: check if the IDs really exist */
4738 3 : ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);
4739 :
4740 3 : err = btrfs_end_transaction(trans, root);
4741 3 : if (err && !ret)
4742 : ret = err;
4743 :
4744 : out:
4745 3 : kfree(sa);
4746 : drop_write:
4747 3 : mnt_drop_write_file(file);
4748 3 : return ret;
4749 : }
4750 :
4751 2 : static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
4752 : {
4753 2 : struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4754 : struct btrfs_ioctl_quota_rescan_args *qsa;
4755 : int ret;
4756 :
4757 2 : if (!capable(CAP_SYS_ADMIN))
4758 : return -EPERM;
4759 :
4760 2 : ret = mnt_want_write_file(file);
4761 2 : if (ret)
4762 0 : return ret;
4763 :
4764 2 : qsa = memdup_user(arg, sizeof(*qsa));
4765 2 : if (IS_ERR(qsa)) {
4766 0 : ret = PTR_ERR(qsa);
4767 0 : goto drop_write;
4768 : }
4769 :
4770 2 : if (qsa->flags) {
4771 : ret = -EINVAL;
4772 : goto out;
4773 : }
4774 :
4775 2 : ret = btrfs_qgroup_rescan(root->fs_info);
4776 :
4777 : out:
4778 2 : kfree(qsa);
4779 : drop_write:
4780 2 : mnt_drop_write_file(file);
4781 2 : return ret;
4782 : }
4783 :
4784 0 : static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
4785 : {
4786 0 : struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4787 : struct btrfs_ioctl_quota_rescan_args *qsa;
4788 : int ret = 0;
4789 :
4790 0 : if (!capable(CAP_SYS_ADMIN))
4791 : return -EPERM;
4792 :
4793 0 : qsa = kzalloc(sizeof(*qsa), GFP_NOFS);
4794 0 : if (!qsa)
4795 : return -ENOMEM;
4796 :
4797 0 : if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
4798 0 : qsa->flags = 1;
4799 0 : qsa->progress = root->fs_info->qgroup_rescan_progress.objectid;
4800 : }
4801 :
4802 0 : if (copy_to_user(arg, qsa, sizeof(*qsa)))
4803 : ret = -EFAULT;
4804 :
4805 0 : kfree(qsa);
4806 0 : return ret;
4807 : }
4808 :
4809 2 : static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
4810 : {
4811 2 : struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4812 :
4813 2 : if (!capable(CAP_SYS_ADMIN))
4814 : return -EPERM;
4815 :
4816 2 : return btrfs_qgroup_wait_for_completion(root->fs_info);
4817 : }
4818 :
4819 36 : static long _btrfs_ioctl_set_received_subvol(struct file *file,
4820 : struct btrfs_ioctl_received_subvol_args *sa)
4821 : {
4822 : struct inode *inode = file_inode(file);
4823 72 : struct btrfs_root *root = BTRFS_I(inode)->root;
4824 : struct btrfs_root_item *root_item = &root->root_item;
4825 : struct btrfs_trans_handle *trans;
4826 36 : struct timespec ct = CURRENT_TIME;
4827 : int ret = 0;
4828 : int received_uuid_changed;
4829 :
4830 36 : if (!inode_owner_or_capable(inode))
4831 : return -EPERM;
4832 :
4833 36 : ret = mnt_want_write_file(file);
4834 36 : if (ret < 0)
4835 0 : return ret;
4836 :
4837 36 : down_write(&root->fs_info->subvol_sem);
4838 :
4839 36 : if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
4840 : ret = -EINVAL;
4841 : goto out;
4842 : }
4843 :
4844 36 : if (btrfs_root_readonly(root)) {
4845 : ret = -EROFS;
4846 : goto out;
4847 : }
4848 :
4849 : /*
4850 : * 1 - root item
4851 : * 2 - uuid items (received uuid + subvol uuid)
4852 : */
4853 36 : trans = btrfs_start_transaction(root, 3);
4854 36 : if (IS_ERR(trans)) {
4855 0 : ret = PTR_ERR(trans);
4856 : trans = NULL;
4857 0 : goto out;
4858 : }
4859 :
4860 36 : sa->rtransid = trans->transid;
4861 36 : sa->rtime.sec = ct.tv_sec;
4862 36 : sa->rtime.nsec = ct.tv_nsec;
4863 :
4864 36 : received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
4865 : BTRFS_UUID_SIZE);
4866 72 : if (received_uuid_changed &&
4867 : !btrfs_is_empty_uuid(root_item->received_uuid))
4868 0 : btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
4869 : root_item->received_uuid,
4870 : BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4871 : root->root_key.objectid);
4872 36 : memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
4873 36 : btrfs_set_root_stransid(root_item, sa->stransid);
4874 36 : btrfs_set_root_rtransid(root_item, sa->rtransid);
4875 36 : btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
4876 36 : btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
4877 36 : btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
4878 36 : btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
4879 :
4880 36 : ret = btrfs_update_root(trans, root->fs_info->tree_root,
4881 : &root->root_key, &root->root_item);
4882 36 : if (ret < 0) {
4883 0 : btrfs_end_transaction(trans, root);
4884 0 : goto out;
4885 : }
4886 72 : if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
4887 36 : ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
4888 : sa->uuid,
4889 : BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4890 : root->root_key.objectid);
4891 36 : if (ret < 0 && ret != -EEXIST) {
4892 0 : btrfs_abort_transaction(trans, root, ret);
4893 0 : goto out;
4894 : }
4895 : }
4896 36 : ret = btrfs_commit_transaction(trans, root);
4897 36 : if (ret < 0) {
4898 0 : btrfs_abort_transaction(trans, root, ret);
4899 0 : goto out;
4900 : }
4901 :
4902 : out:
4903 36 : up_write(&root->fs_info->subvol_sem);
4904 36 : mnt_drop_write_file(file);
4905 36 : return ret;
4906 : }
4907 :
4908 : #ifdef CONFIG_64BIT
4909 0 : static long btrfs_ioctl_set_received_subvol_32(struct file *file,
4910 : void __user *arg)
4911 : {
4912 : struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
4913 : struct btrfs_ioctl_received_subvol_args *args64 = NULL;
4914 : int ret = 0;
4915 :
4916 0 : args32 = memdup_user(arg, sizeof(*args32));
4917 0 : if (IS_ERR(args32)) {
4918 0 : ret = PTR_ERR(args32);
4919 : args32 = NULL;
4920 0 : goto out;
4921 : }
4922 :
4923 : args64 = kmalloc(sizeof(*args64), GFP_NOFS);
4924 0 : if (!args64) {
4925 : ret = -ENOMEM;
4926 : goto out;
4927 : }
4928 :
4929 0 : memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
4930 0 : args64->stransid = args32->stransid;
4931 0 : args64->rtransid = args32->rtransid;
4932 0 : args64->stime.sec = args32->stime.sec;
4933 0 : args64->stime.nsec = args32->stime.nsec;
4934 0 : args64->rtime.sec = args32->rtime.sec;
4935 0 : args64->rtime.nsec = args32->rtime.nsec;
4936 0 : args64->flags = args32->flags;
4937 :
4938 0 : ret = _btrfs_ioctl_set_received_subvol(file, args64);
4939 0 : if (ret)
4940 : goto out;
4941 :
4942 0 : memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
4943 0 : args32->stransid = args64->stransid;
4944 0 : args32->rtransid = args64->rtransid;
4945 0 : args32->stime.sec = args64->stime.sec;
4946 0 : args32->stime.nsec = args64->stime.nsec;
4947 0 : args32->rtime.sec = args64->rtime.sec;
4948 0 : args32->rtime.nsec = args64->rtime.nsec;
4949 0 : args32->flags = args64->flags;
4950 :
4951 0 : ret = copy_to_user(arg, args32, sizeof(*args32));
4952 0 : if (ret)
4953 : ret = -EFAULT;
4954 :
4955 : out:
4956 0 : kfree(args32);
4957 0 : kfree(args64);
4958 0 : return ret;
4959 : }
4960 : #endif
4961 :
4962 36 : static long btrfs_ioctl_set_received_subvol(struct file *file,
4963 : void __user *arg)
4964 : {
4965 : struct btrfs_ioctl_received_subvol_args *sa = NULL;
4966 : int ret = 0;
4967 :
4968 36 : sa = memdup_user(arg, sizeof(*sa));
4969 36 : if (IS_ERR(sa)) {
4970 0 : ret = PTR_ERR(sa);
4971 : sa = NULL;
4972 0 : goto out;
4973 : }
4974 :
4975 36 : ret = _btrfs_ioctl_set_received_subvol(file, sa);
4976 :
4977 36 : if (ret)
4978 : goto out;
4979 :
4980 36 : ret = copy_to_user(arg, sa, sizeof(*sa));
4981 36 : if (ret)
4982 : ret = -EFAULT;
4983 :
4984 : out:
4985 36 : kfree(sa);
4986 36 : return ret;
4987 : }
4988 :
4989 16 : static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
4990 : {
4991 16 : struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4992 : size_t len;
4993 : int ret;
4994 : char label[BTRFS_LABEL_SIZE];
4995 :
4996 16 : spin_lock(&root->fs_info->super_lock);
4997 16 : memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
4998 : spin_unlock(&root->fs_info->super_lock);
4999 :
5000 16 : len = strnlen(label, BTRFS_LABEL_SIZE);
5001 :
5002 16 : if (len == BTRFS_LABEL_SIZE) {
5003 0 : btrfs_warn(root->fs_info,
5004 : "label is too long, return the first %zu bytes", --len);
5005 : }
5006 :
5007 16 : ret = copy_to_user(arg, label, len);
5008 :
5009 16 : return ret ? -EFAULT : 0;
5010 : }
5011 :
5012 2 : static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
5013 : {
5014 2 : struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5015 2 : struct btrfs_super_block *super_block = root->fs_info->super_copy;
5016 : struct btrfs_trans_handle *trans;
5017 : char label[BTRFS_LABEL_SIZE];
5018 : int ret;
5019 :
5020 2 : if (!capable(CAP_SYS_ADMIN))
5021 : return -EPERM;
5022 :
5023 2 : if (copy_from_user(label, arg, sizeof(label)))
5024 : return -EFAULT;
5025 :
5026 2 : if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
5027 0 : btrfs_err(root->fs_info, "unable to set label with more than %d bytes",
5028 : BTRFS_LABEL_SIZE - 1);
5029 0 : return -EINVAL;
5030 : }
5031 :
5032 2 : ret = mnt_want_write_file(file);
5033 2 : if (ret)
5034 : return ret;
5035 :
5036 2 : trans = btrfs_start_transaction(root, 0);
5037 2 : if (IS_ERR(trans)) {
5038 0 : ret = PTR_ERR(trans);
5039 0 : goto out_unlock;
5040 : }
5041 :
5042 2 : spin_lock(&root->fs_info->super_lock);
5043 2 : strcpy(super_block->label, label);
5044 2 : spin_unlock(&root->fs_info->super_lock);
5045 2 : ret = btrfs_commit_transaction(trans, root);
5046 :
5047 : out_unlock:
5048 2 : mnt_drop_write_file(file);
5049 2 : return ret;
5050 : }
5051 :
5052 : #define INIT_FEATURE_FLAGS(suffix) \
5053 : { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
5054 : .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
5055 : .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
5056 :
5057 : static int btrfs_ioctl_get_supported_features(struct file *file,
5058 : void __user *arg)
5059 : {
5060 : static struct btrfs_ioctl_feature_flags features[3] = {
5061 : INIT_FEATURE_FLAGS(SUPP),
5062 : INIT_FEATURE_FLAGS(SAFE_SET),
5063 : INIT_FEATURE_FLAGS(SAFE_CLEAR)
5064 : };
5065 :
5066 0 : if (copy_to_user(arg, &features, sizeof(features)))
5067 : return -EFAULT;
5068 :
5069 : return 0;
5070 : }
5071 :
5072 0 : static int btrfs_ioctl_get_features(struct file *file, void __user *arg)
5073 : {
5074 0 : struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5075 0 : struct btrfs_super_block *super_block = root->fs_info->super_copy;
5076 : struct btrfs_ioctl_feature_flags features;
5077 :
5078 0 : features.compat_flags = btrfs_super_compat_flags(super_block);
5079 0 : features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
5080 0 : features.incompat_flags = btrfs_super_incompat_flags(super_block);
5081 :
5082 0 : if (copy_to_user(arg, &features, sizeof(features)))
5083 : return -EFAULT;
5084 :
5085 0 : return 0;
5086 : }
5087 :
5088 0 : static int check_feature_bits(struct btrfs_root *root,
5089 : enum btrfs_feature_set set,
5090 : u64 change_mask, u64 flags, u64 supported_flags,
5091 : u64 safe_set, u64 safe_clear)
5092 : {
5093 0 : const char *type = btrfs_feature_set_names[set];
5094 : char *names;
5095 : u64 disallowed, unsupported;
5096 0 : u64 set_mask = flags & change_mask;
5097 0 : u64 clear_mask = ~flags & change_mask;
5098 :
5099 0 : unsupported = set_mask & ~supported_flags;
5100 0 : if (unsupported) {
5101 0 : names = btrfs_printable_features(set, unsupported);
5102 0 : if (names) {
5103 0 : btrfs_warn(root->fs_info,
5104 : "this kernel does not support the %s feature bit%s",
5105 : names, strchr(names, ',') ? "s" : "");
5106 0 : kfree(names);
5107 : } else
5108 0 : btrfs_warn(root->fs_info,
5109 : "this kernel does not support %s bits 0x%llx",
5110 : type, unsupported);
5111 : return -EOPNOTSUPP;
5112 : }
5113 :
5114 0 : disallowed = set_mask & ~safe_set;
5115 0 : if (disallowed) {
5116 0 : names = btrfs_printable_features(set, disallowed);
5117 0 : if (names) {
5118 0 : btrfs_warn(root->fs_info,
5119 : "can't set the %s feature bit%s while mounted",
5120 : names, strchr(names, ',') ? "s" : "");
5121 0 : kfree(names);
5122 : } else
5123 0 : btrfs_warn(root->fs_info,
5124 : "can't set %s bits 0x%llx while mounted",
5125 : type, disallowed);
5126 : return -EPERM;
5127 : }
5128 :
5129 0 : disallowed = clear_mask & ~safe_clear;
5130 0 : if (disallowed) {
5131 0 : names = btrfs_printable_features(set, disallowed);
5132 0 : if (names) {
5133 0 : btrfs_warn(root->fs_info,
5134 : "can't clear the %s feature bit%s while mounted",
5135 : names, strchr(names, ',') ? "s" : "");
5136 0 : kfree(names);
5137 : } else
5138 0 : btrfs_warn(root->fs_info,
5139 : "can't clear %s bits 0x%llx while mounted",
5140 : type, disallowed);
5141 : return -EPERM;
5142 : }
5143 :
5144 : return 0;
5145 : }
5146 :
5147 : #define check_feature(root, change_mask, flags, mask_base) \
5148 : check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \
5149 : BTRFS_FEATURE_ ## mask_base ## _SUPP, \
5150 : BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
5151 : BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
5152 :
5153 0 : static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
5154 : {
5155 0 : struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5156 0 : struct btrfs_super_block *super_block = root->fs_info->super_copy;
5157 : struct btrfs_ioctl_feature_flags flags[2];
5158 : struct btrfs_trans_handle *trans;
5159 : u64 newflags;
5160 : int ret;
5161 :
5162 0 : if (!capable(CAP_SYS_ADMIN))
5163 : return -EPERM;
5164 :
5165 0 : if (copy_from_user(flags, arg, sizeof(flags)))
5166 : return -EFAULT;
5167 :
5168 : /* Nothing to do */
5169 0 : if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
5170 0 : !flags[0].incompat_flags)
5171 : return 0;
5172 :
5173 0 : ret = check_feature(root, flags[0].compat_flags,
5174 : flags[1].compat_flags, COMPAT);
5175 0 : if (ret)
5176 : return ret;
5177 :
5178 0 : ret = check_feature(root, flags[0].compat_ro_flags,
5179 : flags[1].compat_ro_flags, COMPAT_RO);
5180 0 : if (ret)
5181 : return ret;
5182 :
5183 0 : ret = check_feature(root, flags[0].incompat_flags,
5184 : flags[1].incompat_flags, INCOMPAT);
5185 0 : if (ret)
5186 : return ret;
5187 :
5188 0 : trans = btrfs_start_transaction(root, 0);
5189 0 : if (IS_ERR(trans))
5190 0 : return PTR_ERR(trans);
5191 :
5192 0 : spin_lock(&root->fs_info->super_lock);
5193 : newflags = btrfs_super_compat_flags(super_block);
5194 0 : newflags |= flags[0].compat_flags & flags[1].compat_flags;
5195 0 : newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
5196 : btrfs_set_super_compat_flags(super_block, newflags);
5197 :
5198 : newflags = btrfs_super_compat_ro_flags(super_block);
5199 0 : newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
5200 0 : newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
5201 : btrfs_set_super_compat_ro_flags(super_block, newflags);
5202 :
5203 : newflags = btrfs_super_incompat_flags(super_block);
5204 0 : newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
5205 0 : newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
5206 : btrfs_set_super_incompat_flags(super_block, newflags);
5207 0 : spin_unlock(&root->fs_info->super_lock);
5208 :
5209 0 : return btrfs_commit_transaction(trans, root);
5210 : }
5211 :
5212 10547 : long btrfs_ioctl(struct file *file, unsigned int
5213 : cmd, unsigned long arg)
5214 : {
5215 10547 : struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5216 10547 : void __user *argp = (void __user *)arg;
5217 :
5218 10547 : switch (cmd) {
5219 : case FS_IOC_GETFLAGS:
5220 232 : return btrfs_ioctl_getflags(file, argp);
5221 : case FS_IOC_SETFLAGS:
5222 3 : return btrfs_ioctl_setflags(file, argp);
5223 : case FS_IOC_GETVERSION:
5224 0 : return btrfs_ioctl_getversion(file, argp);
5225 : case FITRIM:
5226 0 : return btrfs_ioctl_fitrim(file, argp);
5227 : case BTRFS_IOC_SNAP_CREATE:
5228 0 : return btrfs_ioctl_snap_create(file, argp, 0);
5229 : case BTRFS_IOC_SNAP_CREATE_V2:
5230 146 : return btrfs_ioctl_snap_create_v2(file, argp, 0);
5231 : case BTRFS_IOC_SUBVOL_CREATE:
5232 39 : return btrfs_ioctl_snap_create(file, argp, 1);
5233 : case BTRFS_IOC_SUBVOL_CREATE_V2:
5234 10 : return btrfs_ioctl_snap_create_v2(file, argp, 1);
5235 : case BTRFS_IOC_SNAP_DESTROY:
5236 34 : return btrfs_ioctl_snap_destroy(file, argp);
5237 : case BTRFS_IOC_SUBVOL_GETFLAGS:
5238 138 : return btrfs_ioctl_subvol_getflags(file, argp);
5239 : case BTRFS_IOC_SUBVOL_SETFLAGS:
5240 38 : return btrfs_ioctl_subvol_setflags(file, argp);
5241 : case BTRFS_IOC_DEFAULT_SUBVOL:
5242 3 : return btrfs_ioctl_default_subvol(file, argp);
5243 : case BTRFS_IOC_DEFRAG:
5244 10 : return btrfs_ioctl_defrag(file, NULL);
5245 : case BTRFS_IOC_DEFRAG_RANGE:
5246 156 : return btrfs_ioctl_defrag(file, argp);
5247 : case BTRFS_IOC_RESIZE:
5248 0 : return btrfs_ioctl_resize(file, argp);
5249 : case BTRFS_IOC_ADD_DEV:
5250 0 : return btrfs_ioctl_add_dev(root, argp);
5251 : case BTRFS_IOC_RM_DEV:
5252 0 : return btrfs_ioctl_rm_dev(file, argp);
5253 : case BTRFS_IOC_FS_INFO:
5254 160 : return btrfs_ioctl_fs_info(root, argp);
5255 : case BTRFS_IOC_DEV_INFO:
5256 60 : return btrfs_ioctl_dev_info(root, argp);
5257 : case BTRFS_IOC_BALANCE:
5258 0 : return btrfs_ioctl_balance(file, NULL);
5259 : case BTRFS_IOC_CLONE:
5260 19 : return btrfs_ioctl_clone(file, arg, 0, 0, 0);
5261 : case BTRFS_IOC_CLONE_RANGE:
5262 51 : return btrfs_ioctl_clone_range(file, argp);
5263 : case BTRFS_IOC_TRANS_START:
5264 0 : return btrfs_ioctl_trans_start(file);
5265 : case BTRFS_IOC_TRANS_END:
5266 0 : return btrfs_ioctl_trans_end(file);
5267 : case BTRFS_IOC_TREE_SEARCH:
5268 222 : return btrfs_ioctl_tree_search(file, argp);
5269 : case BTRFS_IOC_TREE_SEARCH_V2:
5270 0 : return btrfs_ioctl_tree_search_v2(file, argp);
5271 : case BTRFS_IOC_INO_LOOKUP:
5272 44 : return btrfs_ioctl_ino_lookup(file, argp);
5273 : case BTRFS_IOC_INO_PATHS:
5274 463 : return btrfs_ioctl_ino_to_path(root, argp);
5275 : case BTRFS_IOC_LOGICAL_INO:
5276 463 : return btrfs_ioctl_logical_to_ino(root, argp);
5277 : case BTRFS_IOC_SPACE_INFO:
5278 16 : return btrfs_ioctl_space_info(root, argp);
5279 : case BTRFS_IOC_SYNC: {
5280 : int ret;
5281 :
5282 8 : ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1);
5283 8 : if (ret)
5284 0 : return ret;
5285 8 : ret = btrfs_sync_fs(file->f_dentry->d_sb, 1);
5286 8 : return ret;
5287 : }
5288 : case BTRFS_IOC_START_SYNC:
5289 0 : return btrfs_ioctl_start_sync(root, argp);
5290 : case BTRFS_IOC_WAIT_SYNC:
5291 0 : return btrfs_ioctl_wait_sync(root, argp);
5292 : case BTRFS_IOC_SCRUB:
5293 11 : return btrfs_ioctl_scrub(file, argp);
5294 : case BTRFS_IOC_SCRUB_CANCEL:
5295 0 : return btrfs_ioctl_scrub_cancel(root, argp);
5296 : case BTRFS_IOC_SCRUB_PROGRESS:
5297 12 : return btrfs_ioctl_scrub_progress(root, argp);
5298 : case BTRFS_IOC_BALANCE_V2:
5299 22 : return btrfs_ioctl_balance(file, argp);
5300 : case BTRFS_IOC_BALANCE_CTL:
5301 0 : return btrfs_ioctl_balance_ctl(root, arg);
5302 : case BTRFS_IOC_BALANCE_PROGRESS:
5303 0 : return btrfs_ioctl_balance_progress(root, argp);
5304 : case BTRFS_IOC_SET_RECEIVED_SUBVOL:
5305 36 : return btrfs_ioctl_set_received_subvol(file, argp);
5306 : #ifdef CONFIG_64BIT
5307 : case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
5308 0 : return btrfs_ioctl_set_received_subvol_32(file, argp);
5309 : #endif
5310 : case BTRFS_IOC_SEND:
5311 39 : return btrfs_ioctl_send(file, argp);
5312 : case BTRFS_IOC_GET_DEV_STATS:
5313 10 : return btrfs_ioctl_get_dev_stats(root, argp);
5314 : case BTRFS_IOC_QUOTA_CTL:
5315 6 : return btrfs_ioctl_quota_ctl(file, argp);
5316 : case BTRFS_IOC_QGROUP_ASSIGN:
5317 0 : return btrfs_ioctl_qgroup_assign(file, argp);
5318 : case BTRFS_IOC_QGROUP_CREATE:
5319 1 : return btrfs_ioctl_qgroup_create(file, argp);
5320 : case BTRFS_IOC_QGROUP_LIMIT:
5321 3 : return btrfs_ioctl_qgroup_limit(file, argp);
5322 : case BTRFS_IOC_QUOTA_RESCAN:
5323 2 : return btrfs_ioctl_quota_rescan(file, argp);
5324 : case BTRFS_IOC_QUOTA_RESCAN_STATUS:
5325 0 : return btrfs_ioctl_quota_rescan_status(file, argp);
5326 : case BTRFS_IOC_QUOTA_RESCAN_WAIT:
5327 2 : return btrfs_ioctl_quota_rescan_wait(file, argp);
5328 : case BTRFS_IOC_DEV_REPLACE:
5329 25 : return btrfs_ioctl_dev_replace(root, argp);
5330 : case BTRFS_IOC_GET_FSLABEL:
5331 16 : return btrfs_ioctl_get_fslabel(file, argp);
5332 : case BTRFS_IOC_SET_FSLABEL:
5333 2 : return btrfs_ioctl_set_fslabel(file, argp);
5334 : case BTRFS_IOC_FILE_EXTENT_SAME:
5335 0 : return btrfs_ioctl_file_extent_same(file, argp);
5336 : case BTRFS_IOC_GET_SUPPORTED_FEATURES:
5337 0 : return btrfs_ioctl_get_supported_features(file, argp);
5338 : case BTRFS_IOC_GET_FEATURES:
5339 0 : return btrfs_ioctl_get_features(file, argp);
5340 : case BTRFS_IOC_SET_FEATURES:
5341 0 : return btrfs_ioctl_set_features(file, argp);
5342 : }
5343 :
5344 : return -ENOTTY;
5345 : }
|
