Commit | Line | Data |
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f46b5a66 CH |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/bio.h> | |
21 | #include <linux/buffer_head.h> | |
22 | #include <linux/file.h> | |
23 | #include <linux/fs.h> | |
cb8e7090 | 24 | #include <linux/fsnotify.h> |
f46b5a66 CH |
25 | #include <linux/pagemap.h> |
26 | #include <linux/highmem.h> | |
27 | #include <linux/time.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/string.h> | |
f46b5a66 | 30 | #include <linux/backing-dev.h> |
cb8e7090 | 31 | #include <linux/mount.h> |
f46b5a66 | 32 | #include <linux/mpage.h> |
cb8e7090 | 33 | #include <linux/namei.h> |
f46b5a66 CH |
34 | #include <linux/swap.h> |
35 | #include <linux/writeback.h> | |
36 | #include <linux/statfs.h> | |
37 | #include <linux/compat.h> | |
38 | #include <linux/bit_spinlock.h> | |
cb8e7090 | 39 | #include <linux/security.h> |
f46b5a66 | 40 | #include <linux/xattr.h> |
7ea394f1 | 41 | #include <linux/vmalloc.h> |
5a0e3ad6 | 42 | #include <linux/slab.h> |
f7039b1d | 43 | #include <linux/blkdev.h> |
8ea05e3a | 44 | #include <linux/uuid.h> |
55e301fd | 45 | #include <linux/btrfs.h> |
4b4e25f2 | 46 | #include "compat.h" |
f46b5a66 CH |
47 | #include "ctree.h" |
48 | #include "disk-io.h" | |
49 | #include "transaction.h" | |
50 | #include "btrfs_inode.h" | |
f46b5a66 CH |
51 | #include "print-tree.h" |
52 | #include "volumes.h" | |
925baedd | 53 | #include "locking.h" |
581bb050 | 54 | #include "inode-map.h" |
d7728c96 | 55 | #include "backref.h" |
606686ee | 56 | #include "rcu-string.h" |
31db9f7c | 57 | #include "send.h" |
3f6bcfbd | 58 | #include "dev-replace.h" |
f46b5a66 | 59 | |
6cbff00f CH |
60 | /* Mask out flags that are inappropriate for the given type of inode. */ |
61 | static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) | |
62 | { | |
63 | if (S_ISDIR(mode)) | |
64 | return flags; | |
65 | else if (S_ISREG(mode)) | |
66 | return flags & ~FS_DIRSYNC_FL; | |
67 | else | |
68 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); | |
69 | } | |
70 | ||
71 | /* | |
72 | * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. | |
73 | */ | |
74 | static unsigned int btrfs_flags_to_ioctl(unsigned int flags) | |
75 | { | |
76 | unsigned int iflags = 0; | |
77 | ||
78 | if (flags & BTRFS_INODE_SYNC) | |
79 | iflags |= FS_SYNC_FL; | |
80 | if (flags & BTRFS_INODE_IMMUTABLE) | |
81 | iflags |= FS_IMMUTABLE_FL; | |
82 | if (flags & BTRFS_INODE_APPEND) | |
83 | iflags |= FS_APPEND_FL; | |
84 | if (flags & BTRFS_INODE_NODUMP) | |
85 | iflags |= FS_NODUMP_FL; | |
86 | if (flags & BTRFS_INODE_NOATIME) | |
87 | iflags |= FS_NOATIME_FL; | |
88 | if (flags & BTRFS_INODE_DIRSYNC) | |
89 | iflags |= FS_DIRSYNC_FL; | |
d0092bdd LZ |
90 | if (flags & BTRFS_INODE_NODATACOW) |
91 | iflags |= FS_NOCOW_FL; | |
92 | ||
93 | if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) | |
94 | iflags |= FS_COMPR_FL; | |
95 | else if (flags & BTRFS_INODE_NOCOMPRESS) | |
96 | iflags |= FS_NOCOMP_FL; | |
6cbff00f CH |
97 | |
98 | return iflags; | |
99 | } | |
100 | ||
101 | /* | |
102 | * Update inode->i_flags based on the btrfs internal flags. | |
103 | */ | |
104 | void btrfs_update_iflags(struct inode *inode) | |
105 | { | |
106 | struct btrfs_inode *ip = BTRFS_I(inode); | |
107 | ||
108 | inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
109 | ||
110 | if (ip->flags & BTRFS_INODE_SYNC) | |
111 | inode->i_flags |= S_SYNC; | |
112 | if (ip->flags & BTRFS_INODE_IMMUTABLE) | |
113 | inode->i_flags |= S_IMMUTABLE; | |
114 | if (ip->flags & BTRFS_INODE_APPEND) | |
115 | inode->i_flags |= S_APPEND; | |
116 | if (ip->flags & BTRFS_INODE_NOATIME) | |
117 | inode->i_flags |= S_NOATIME; | |
118 | if (ip->flags & BTRFS_INODE_DIRSYNC) | |
119 | inode->i_flags |= S_DIRSYNC; | |
120 | } | |
121 | ||
122 | /* | |
123 | * Inherit flags from the parent inode. | |
124 | * | |
e27425d6 | 125 | * Currently only the compression flags and the cow flags are inherited. |
6cbff00f CH |
126 | */ |
127 | void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) | |
128 | { | |
0b4dcea5 CM |
129 | unsigned int flags; |
130 | ||
131 | if (!dir) | |
132 | return; | |
133 | ||
134 | flags = BTRFS_I(dir)->flags; | |
6cbff00f | 135 | |
e27425d6 JB |
136 | if (flags & BTRFS_INODE_NOCOMPRESS) { |
137 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; | |
138 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; | |
139 | } else if (flags & BTRFS_INODE_COMPRESS) { | |
140 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
141 | BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; | |
142 | } | |
143 | ||
213490b3 | 144 | if (flags & BTRFS_INODE_NODATACOW) { |
e27425d6 | 145 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; |
213490b3 LB |
146 | if (S_ISREG(inode->i_mode)) |
147 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; | |
148 | } | |
6cbff00f | 149 | |
6cbff00f CH |
150 | btrfs_update_iflags(inode); |
151 | } | |
152 | ||
153 | static int btrfs_ioctl_getflags(struct file *file, void __user *arg) | |
154 | { | |
496ad9aa | 155 | struct btrfs_inode *ip = BTRFS_I(file_inode(file)); |
6cbff00f CH |
156 | unsigned int flags = btrfs_flags_to_ioctl(ip->flags); |
157 | ||
158 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
159 | return -EFAULT; | |
160 | return 0; | |
161 | } | |
162 | ||
75e7cb7f LB |
163 | static int check_flags(unsigned int flags) |
164 | { | |
165 | if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ | |
166 | FS_NOATIME_FL | FS_NODUMP_FL | \ | |
167 | FS_SYNC_FL | FS_DIRSYNC_FL | \ | |
e1e8fb6a LZ |
168 | FS_NOCOMP_FL | FS_COMPR_FL | |
169 | FS_NOCOW_FL)) | |
75e7cb7f LB |
170 | return -EOPNOTSUPP; |
171 | ||
172 | if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) | |
173 | return -EINVAL; | |
174 | ||
75e7cb7f LB |
175 | return 0; |
176 | } | |
177 | ||
6cbff00f CH |
178 | static int btrfs_ioctl_setflags(struct file *file, void __user *arg) |
179 | { | |
496ad9aa | 180 | struct inode *inode = file_inode(file); |
6cbff00f CH |
181 | struct btrfs_inode *ip = BTRFS_I(inode); |
182 | struct btrfs_root *root = ip->root; | |
183 | struct btrfs_trans_handle *trans; | |
184 | unsigned int flags, oldflags; | |
185 | int ret; | |
f062abf0 LZ |
186 | u64 ip_oldflags; |
187 | unsigned int i_oldflags; | |
7e97b8da | 188 | umode_t mode; |
6cbff00f | 189 | |
b83cc969 LZ |
190 | if (btrfs_root_readonly(root)) |
191 | return -EROFS; | |
192 | ||
6cbff00f CH |
193 | if (copy_from_user(&flags, arg, sizeof(flags))) |
194 | return -EFAULT; | |
195 | ||
75e7cb7f LB |
196 | ret = check_flags(flags); |
197 | if (ret) | |
198 | return ret; | |
f46b5a66 | 199 | |
2e149670 | 200 | if (!inode_owner_or_capable(inode)) |
6cbff00f CH |
201 | return -EACCES; |
202 | ||
e7848683 JK |
203 | ret = mnt_want_write_file(file); |
204 | if (ret) | |
205 | return ret; | |
206 | ||
6cbff00f CH |
207 | mutex_lock(&inode->i_mutex); |
208 | ||
f062abf0 LZ |
209 | ip_oldflags = ip->flags; |
210 | i_oldflags = inode->i_flags; | |
7e97b8da | 211 | mode = inode->i_mode; |
f062abf0 | 212 | |
6cbff00f CH |
213 | flags = btrfs_mask_flags(inode->i_mode, flags); |
214 | oldflags = btrfs_flags_to_ioctl(ip->flags); | |
215 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { | |
216 | if (!capable(CAP_LINUX_IMMUTABLE)) { | |
217 | ret = -EPERM; | |
218 | goto out_unlock; | |
219 | } | |
220 | } | |
221 | ||
6cbff00f CH |
222 | if (flags & FS_SYNC_FL) |
223 | ip->flags |= BTRFS_INODE_SYNC; | |
224 | else | |
225 | ip->flags &= ~BTRFS_INODE_SYNC; | |
226 | if (flags & FS_IMMUTABLE_FL) | |
227 | ip->flags |= BTRFS_INODE_IMMUTABLE; | |
228 | else | |
229 | ip->flags &= ~BTRFS_INODE_IMMUTABLE; | |
230 | if (flags & FS_APPEND_FL) | |
231 | ip->flags |= BTRFS_INODE_APPEND; | |
232 | else | |
233 | ip->flags &= ~BTRFS_INODE_APPEND; | |
234 | if (flags & FS_NODUMP_FL) | |
235 | ip->flags |= BTRFS_INODE_NODUMP; | |
236 | else | |
237 | ip->flags &= ~BTRFS_INODE_NODUMP; | |
238 | if (flags & FS_NOATIME_FL) | |
239 | ip->flags |= BTRFS_INODE_NOATIME; | |
240 | else | |
241 | ip->flags &= ~BTRFS_INODE_NOATIME; | |
242 | if (flags & FS_DIRSYNC_FL) | |
243 | ip->flags |= BTRFS_INODE_DIRSYNC; | |
244 | else | |
245 | ip->flags &= ~BTRFS_INODE_DIRSYNC; | |
7e97b8da DS |
246 | if (flags & FS_NOCOW_FL) { |
247 | if (S_ISREG(mode)) { | |
248 | /* | |
249 | * It's safe to turn csums off here, no extents exist. | |
250 | * Otherwise we want the flag to reflect the real COW | |
251 | * status of the file and will not set it. | |
252 | */ | |
253 | if (inode->i_size == 0) | |
254 | ip->flags |= BTRFS_INODE_NODATACOW | |
255 | | BTRFS_INODE_NODATASUM; | |
256 | } else { | |
257 | ip->flags |= BTRFS_INODE_NODATACOW; | |
258 | } | |
259 | } else { | |
260 | /* | |
261 | * Revert back under same assuptions as above | |
262 | */ | |
263 | if (S_ISREG(mode)) { | |
264 | if (inode->i_size == 0) | |
265 | ip->flags &= ~(BTRFS_INODE_NODATACOW | |
266 | | BTRFS_INODE_NODATASUM); | |
267 | } else { | |
268 | ip->flags &= ~BTRFS_INODE_NODATACOW; | |
269 | } | |
270 | } | |
6cbff00f | 271 | |
75e7cb7f LB |
272 | /* |
273 | * The COMPRESS flag can only be changed by users, while the NOCOMPRESS | |
274 | * flag may be changed automatically if compression code won't make | |
275 | * things smaller. | |
276 | */ | |
277 | if (flags & FS_NOCOMP_FL) { | |
278 | ip->flags &= ~BTRFS_INODE_COMPRESS; | |
279 | ip->flags |= BTRFS_INODE_NOCOMPRESS; | |
280 | } else if (flags & FS_COMPR_FL) { | |
281 | ip->flags |= BTRFS_INODE_COMPRESS; | |
282 | ip->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
ebcb904d LZ |
283 | } else { |
284 | ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); | |
75e7cb7f | 285 | } |
6cbff00f | 286 | |
4da6f1a3 | 287 | trans = btrfs_start_transaction(root, 1); |
f062abf0 LZ |
288 | if (IS_ERR(trans)) { |
289 | ret = PTR_ERR(trans); | |
290 | goto out_drop; | |
291 | } | |
6cbff00f | 292 | |
306424cc | 293 | btrfs_update_iflags(inode); |
0c4d2d95 | 294 | inode_inc_iversion(inode); |
306424cc | 295 | inode->i_ctime = CURRENT_TIME; |
6cbff00f | 296 | ret = btrfs_update_inode(trans, root, inode); |
6cbff00f | 297 | |
6cbff00f | 298 | btrfs_end_transaction(trans, root); |
f062abf0 LZ |
299 | out_drop: |
300 | if (ret) { | |
301 | ip->flags = ip_oldflags; | |
302 | inode->i_flags = i_oldflags; | |
303 | } | |
6cbff00f | 304 | |
6cbff00f CH |
305 | out_unlock: |
306 | mutex_unlock(&inode->i_mutex); | |
e7848683 | 307 | mnt_drop_write_file(file); |
2d4e6f6a | 308 | return ret; |
6cbff00f CH |
309 | } |
310 | ||
311 | static int btrfs_ioctl_getversion(struct file *file, int __user *arg) | |
312 | { | |
496ad9aa | 313 | struct inode *inode = file_inode(file); |
6cbff00f CH |
314 | |
315 | return put_user(inode->i_generation, arg); | |
316 | } | |
f46b5a66 | 317 | |
f7039b1d LD |
318 | static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) |
319 | { | |
815745cf | 320 | struct btrfs_fs_info *fs_info = btrfs_sb(fdentry(file)->d_sb); |
f7039b1d LD |
321 | struct btrfs_device *device; |
322 | struct request_queue *q; | |
323 | struct fstrim_range range; | |
324 | u64 minlen = ULLONG_MAX; | |
325 | u64 num_devices = 0; | |
815745cf | 326 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
f7039b1d LD |
327 | int ret; |
328 | ||
329 | if (!capable(CAP_SYS_ADMIN)) | |
330 | return -EPERM; | |
331 | ||
1f78160c XG |
332 | rcu_read_lock(); |
333 | list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, | |
334 | dev_list) { | |
f7039b1d LD |
335 | if (!device->bdev) |
336 | continue; | |
337 | q = bdev_get_queue(device->bdev); | |
338 | if (blk_queue_discard(q)) { | |
339 | num_devices++; | |
340 | minlen = min((u64)q->limits.discard_granularity, | |
341 | minlen); | |
342 | } | |
343 | } | |
1f78160c | 344 | rcu_read_unlock(); |
f4c697e6 | 345 | |
f7039b1d LD |
346 | if (!num_devices) |
347 | return -EOPNOTSUPP; | |
f7039b1d LD |
348 | if (copy_from_user(&range, arg, sizeof(range))) |
349 | return -EFAULT; | |
e515c18b LC |
350 | if (range.start > total_bytes || |
351 | range.len < fs_info->sb->s_blocksize) | |
f4c697e6 | 352 | return -EINVAL; |
f7039b1d | 353 | |
f4c697e6 | 354 | range.len = min(range.len, total_bytes - range.start); |
f7039b1d | 355 | range.minlen = max(range.minlen, minlen); |
815745cf | 356 | ret = btrfs_trim_fs(fs_info->tree_root, &range); |
f7039b1d LD |
357 | if (ret < 0) |
358 | return ret; | |
359 | ||
360 | if (copy_to_user(arg, &range, sizeof(range))) | |
361 | return -EFAULT; | |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
d5c12070 | 366 | static noinline int create_subvol(struct inode *dir, |
cb8e7090 | 367 | struct dentry *dentry, |
72fd032e | 368 | char *name, int namelen, |
6f72c7e2 | 369 | u64 *async_transid, |
8696c533 | 370 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 CH |
371 | { |
372 | struct btrfs_trans_handle *trans; | |
373 | struct btrfs_key key; | |
374 | struct btrfs_root_item root_item; | |
375 | struct btrfs_inode_item *inode_item; | |
376 | struct extent_buffer *leaf; | |
d5c12070 | 377 | struct btrfs_root *root = BTRFS_I(dir)->root; |
76dda93c | 378 | struct btrfs_root *new_root; |
d5c12070 | 379 | struct btrfs_block_rsv block_rsv; |
8ea05e3a | 380 | struct timespec cur_time = CURRENT_TIME; |
f46b5a66 CH |
381 | int ret; |
382 | int err; | |
383 | u64 objectid; | |
384 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
3de4586c | 385 | u64 index = 0; |
d5c12070 | 386 | u64 qgroup_reserved; |
8ea05e3a | 387 | uuid_le new_uuid; |
f46b5a66 | 388 | |
581bb050 | 389 | ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); |
2fbe8c8a | 390 | if (ret) |
a22285a6 | 391 | return ret; |
6a912213 | 392 | |
d5c12070 | 393 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
9ed74f2d | 394 | /* |
d5c12070 MX |
395 | * The same as the snapshot creation, please see the comment |
396 | * of create_snapshot(). | |
9ed74f2d | 397 | */ |
d5c12070 | 398 | ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, |
ee3441b4 | 399 | 7, &qgroup_reserved, false); |
d5c12070 MX |
400 | if (ret) |
401 | return ret; | |
402 | ||
403 | trans = btrfs_start_transaction(root, 0); | |
404 | if (IS_ERR(trans)) { | |
405 | ret = PTR_ERR(trans); | |
406 | goto out; | |
407 | } | |
408 | trans->block_rsv = &block_rsv; | |
409 | trans->bytes_reserved = block_rsv.size; | |
f46b5a66 | 410 | |
8696c533 | 411 | ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); |
6f72c7e2 AJ |
412 | if (ret) |
413 | goto fail; | |
414 | ||
5d4f98a2 | 415 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, |
5581a51a | 416 | 0, objectid, NULL, 0, 0, 0); |
8e8a1e31 JB |
417 | if (IS_ERR(leaf)) { |
418 | ret = PTR_ERR(leaf); | |
419 | goto fail; | |
420 | } | |
f46b5a66 | 421 | |
5d4f98a2 | 422 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
f46b5a66 CH |
423 | btrfs_set_header_bytenr(leaf, leaf->start); |
424 | btrfs_set_header_generation(leaf, trans->transid); | |
5d4f98a2 | 425 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); |
f46b5a66 CH |
426 | btrfs_set_header_owner(leaf, objectid); |
427 | ||
428 | write_extent_buffer(leaf, root->fs_info->fsid, | |
429 | (unsigned long)btrfs_header_fsid(leaf), | |
430 | BTRFS_FSID_SIZE); | |
5d4f98a2 YZ |
431 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, |
432 | (unsigned long)btrfs_header_chunk_tree_uuid(leaf), | |
433 | BTRFS_UUID_SIZE); | |
f46b5a66 CH |
434 | btrfs_mark_buffer_dirty(leaf); |
435 | ||
8ea05e3a AB |
436 | memset(&root_item, 0, sizeof(root_item)); |
437 | ||
f46b5a66 | 438 | inode_item = &root_item.inode; |
f46b5a66 CH |
439 | inode_item->generation = cpu_to_le64(1); |
440 | inode_item->size = cpu_to_le64(3); | |
441 | inode_item->nlink = cpu_to_le32(1); | |
a76a3cd4 | 442 | inode_item->nbytes = cpu_to_le64(root->leafsize); |
f46b5a66 CH |
443 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); |
444 | ||
08fe4db1 LZ |
445 | root_item.flags = 0; |
446 | root_item.byte_limit = 0; | |
447 | inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT); | |
448 | ||
f46b5a66 | 449 | btrfs_set_root_bytenr(&root_item, leaf->start); |
84234f3a | 450 | btrfs_set_root_generation(&root_item, trans->transid); |
f46b5a66 CH |
451 | btrfs_set_root_level(&root_item, 0); |
452 | btrfs_set_root_refs(&root_item, 1); | |
86b9f2ec | 453 | btrfs_set_root_used(&root_item, leaf->len); |
80ff3856 | 454 | btrfs_set_root_last_snapshot(&root_item, 0); |
f46b5a66 | 455 | |
8ea05e3a AB |
456 | btrfs_set_root_generation_v2(&root_item, |
457 | btrfs_root_generation(&root_item)); | |
458 | uuid_le_gen(&new_uuid); | |
459 | memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); | |
460 | root_item.otime.sec = cpu_to_le64(cur_time.tv_sec); | |
dadd1105 | 461 | root_item.otime.nsec = cpu_to_le32(cur_time.tv_nsec); |
8ea05e3a AB |
462 | root_item.ctime = root_item.otime; |
463 | btrfs_set_root_ctransid(&root_item, trans->transid); | |
464 | btrfs_set_root_otransid(&root_item, trans->transid); | |
f46b5a66 | 465 | |
925baedd | 466 | btrfs_tree_unlock(leaf); |
f46b5a66 CH |
467 | free_extent_buffer(leaf); |
468 | leaf = NULL; | |
469 | ||
470 | btrfs_set_root_dirid(&root_item, new_dirid); | |
471 | ||
472 | key.objectid = objectid; | |
5d4f98a2 | 473 | key.offset = 0; |
f46b5a66 CH |
474 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
475 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
476 | &root_item); | |
477 | if (ret) | |
478 | goto fail; | |
479 | ||
76dda93c YZ |
480 | key.offset = (u64)-1; |
481 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); | |
79787eaa JM |
482 | if (IS_ERR(new_root)) { |
483 | btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); | |
484 | ret = PTR_ERR(new_root); | |
485 | goto fail; | |
486 | } | |
76dda93c YZ |
487 | |
488 | btrfs_record_root_in_trans(trans, new_root); | |
489 | ||
d82a6f1d | 490 | ret = btrfs_create_subvol_root(trans, new_root, new_dirid); |
ce598979 MF |
491 | if (ret) { |
492 | /* We potentially lose an unused inode item here */ | |
79787eaa | 493 | btrfs_abort_transaction(trans, root, ret); |
ce598979 MF |
494 | goto fail; |
495 | } | |
496 | ||
f46b5a66 CH |
497 | /* |
498 | * insert the directory item | |
499 | */ | |
3de4586c | 500 | ret = btrfs_set_inode_index(dir, &index); |
79787eaa JM |
501 | if (ret) { |
502 | btrfs_abort_transaction(trans, root, ret); | |
503 | goto fail; | |
504 | } | |
3de4586c CM |
505 | |
506 | ret = btrfs_insert_dir_item(trans, root, | |
16cdcec7 | 507 | name, namelen, dir, &key, |
3de4586c | 508 | BTRFS_FT_DIR, index); |
79787eaa JM |
509 | if (ret) { |
510 | btrfs_abort_transaction(trans, root, ret); | |
f46b5a66 | 511 | goto fail; |
79787eaa | 512 | } |
0660b5af | 513 | |
52c26179 YZ |
514 | btrfs_i_size_write(dir, dir->i_size + namelen * 2); |
515 | ret = btrfs_update_inode(trans, root, dir); | |
516 | BUG_ON(ret); | |
517 | ||
0660b5af | 518 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
4df27c4d | 519 | objectid, root->root_key.objectid, |
33345d01 | 520 | btrfs_ino(dir), index, name, namelen); |
0660b5af | 521 | |
76dda93c | 522 | BUG_ON(ret); |
f46b5a66 | 523 | |
f46b5a66 | 524 | fail: |
d5c12070 MX |
525 | trans->block_rsv = NULL; |
526 | trans->bytes_reserved = 0; | |
72fd032e SW |
527 | if (async_transid) { |
528 | *async_transid = trans->transid; | |
529 | err = btrfs_commit_transaction_async(trans, root, 1); | |
00d71c9c MX |
530 | if (err) |
531 | err = btrfs_commit_transaction(trans, root); | |
72fd032e SW |
532 | } else { |
533 | err = btrfs_commit_transaction(trans, root); | |
534 | } | |
f46b5a66 CH |
535 | if (err && !ret) |
536 | ret = err; | |
1a65e24b CM |
537 | |
538 | if (!ret) | |
539 | d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); | |
d5c12070 MX |
540 | out: |
541 | btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); | |
f46b5a66 CH |
542 | return ret; |
543 | } | |
544 | ||
e9662f70 MX |
545 | static int create_snapshot(struct btrfs_root *root, struct inode *dir, |
546 | struct dentry *dentry, char *name, int namelen, | |
547 | u64 *async_transid, bool readonly, | |
548 | struct btrfs_qgroup_inherit *inherit) | |
f46b5a66 | 549 | { |
2e4bfab9 | 550 | struct inode *inode; |
f46b5a66 CH |
551 | struct btrfs_pending_snapshot *pending_snapshot; |
552 | struct btrfs_trans_handle *trans; | |
2e4bfab9 | 553 | int ret; |
f46b5a66 CH |
554 | |
555 | if (!root->ref_cows) | |
556 | return -EINVAL; | |
557 | ||
6a03843d MX |
558 | ret = btrfs_start_delalloc_inodes(root, 0); |
559 | if (ret) | |
560 | return ret; | |
561 | ||
562 | btrfs_wait_ordered_extents(root, 0); | |
563 | ||
3de4586c | 564 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
a22285a6 YZ |
565 | if (!pending_snapshot) |
566 | return -ENOMEM; | |
567 | ||
66d8f3dd MX |
568 | btrfs_init_block_rsv(&pending_snapshot->block_rsv, |
569 | BTRFS_BLOCK_RSV_TEMP); | |
d5c12070 MX |
570 | /* |
571 | * 1 - parent dir inode | |
572 | * 2 - dir entries | |
573 | * 1 - root item | |
574 | * 2 - root ref/backref | |
575 | * 1 - root of snapshot | |
576 | */ | |
577 | ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, | |
578 | &pending_snapshot->block_rsv, 7, | |
ee3441b4 JM |
579 | &pending_snapshot->qgroup_reserved, |
580 | false); | |
d5c12070 MX |
581 | if (ret) |
582 | goto out; | |
583 | ||
3de4586c | 584 | pending_snapshot->dentry = dentry; |
f46b5a66 | 585 | pending_snapshot->root = root; |
b83cc969 | 586 | pending_snapshot->readonly = readonly; |
e9662f70 | 587 | pending_snapshot->dir = dir; |
8696c533 | 588 | pending_snapshot->inherit = inherit; |
a22285a6 | 589 | |
d5c12070 | 590 | trans = btrfs_start_transaction(root, 0); |
a22285a6 YZ |
591 | if (IS_ERR(trans)) { |
592 | ret = PTR_ERR(trans); | |
593 | goto fail; | |
594 | } | |
595 | ||
8351583e | 596 | spin_lock(&root->fs_info->trans_lock); |
f46b5a66 CH |
597 | list_add(&pending_snapshot->list, |
598 | &trans->transaction->pending_snapshots); | |
8351583e | 599 | spin_unlock(&root->fs_info->trans_lock); |
72fd032e SW |
600 | if (async_transid) { |
601 | *async_transid = trans->transid; | |
602 | ret = btrfs_commit_transaction_async(trans, | |
603 | root->fs_info->extent_root, 1); | |
00d71c9c MX |
604 | if (ret) |
605 | ret = btrfs_commit_transaction(trans, root); | |
72fd032e SW |
606 | } else { |
607 | ret = btrfs_commit_transaction(trans, | |
608 | root->fs_info->extent_root); | |
609 | } | |
aec8030a | 610 | if (ret) |
c37b2b62 | 611 | goto fail; |
a22285a6 YZ |
612 | |
613 | ret = pending_snapshot->error; | |
614 | if (ret) | |
615 | goto fail; | |
616 | ||
66b4ffd1 JB |
617 | ret = btrfs_orphan_cleanup(pending_snapshot->snap); |
618 | if (ret) | |
619 | goto fail; | |
f46b5a66 | 620 | |
2fbe8c8a | 621 | inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); |
2e4bfab9 YZ |
622 | if (IS_ERR(inode)) { |
623 | ret = PTR_ERR(inode); | |
624 | goto fail; | |
625 | } | |
626 | BUG_ON(!inode); | |
627 | d_instantiate(dentry, inode); | |
628 | ret = 0; | |
629 | fail: | |
d5c12070 MX |
630 | btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, |
631 | &pending_snapshot->block_rsv, | |
632 | pending_snapshot->qgroup_reserved); | |
633 | out: | |
a22285a6 | 634 | kfree(pending_snapshot); |
f46b5a66 CH |
635 | return ret; |
636 | } | |
637 | ||
4260f7c7 SW |
638 | /* copy of check_sticky in fs/namei.c() |
639 | * It's inline, so penalty for filesystems that don't use sticky bit is | |
640 | * minimal. | |
641 | */ | |
642 | static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) | |
643 | { | |
2f2f43d3 | 644 | kuid_t fsuid = current_fsuid(); |
4260f7c7 SW |
645 | |
646 | if (!(dir->i_mode & S_ISVTX)) | |
647 | return 0; | |
2f2f43d3 | 648 | if (uid_eq(inode->i_uid, fsuid)) |
4260f7c7 | 649 | return 0; |
2f2f43d3 | 650 | if (uid_eq(dir->i_uid, fsuid)) |
4260f7c7 SW |
651 | return 0; |
652 | return !capable(CAP_FOWNER); | |
653 | } | |
654 | ||
655 | /* copy of may_delete in fs/namei.c() | |
656 | * Check whether we can remove a link victim from directory dir, check | |
657 | * whether the type of victim is right. | |
658 | * 1. We can't do it if dir is read-only (done in permission()) | |
659 | * 2. We should have write and exec permissions on dir | |
660 | * 3. We can't remove anything from append-only dir | |
661 | * 4. We can't do anything with immutable dir (done in permission()) | |
662 | * 5. If the sticky bit on dir is set we should either | |
663 | * a. be owner of dir, or | |
664 | * b. be owner of victim, or | |
665 | * c. have CAP_FOWNER capability | |
666 | * 6. If the victim is append-only or immutable we can't do antyhing with | |
667 | * links pointing to it. | |
668 | * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. | |
669 | * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. | |
670 | * 9. We can't remove a root or mountpoint. | |
671 | * 10. We don't allow removal of NFS sillyrenamed files; it's handled by | |
672 | * nfs_async_unlink(). | |
673 | */ | |
674 | ||
675 | static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) | |
676 | { | |
677 | int error; | |
678 | ||
679 | if (!victim->d_inode) | |
680 | return -ENOENT; | |
681 | ||
682 | BUG_ON(victim->d_parent->d_inode != dir); | |
4fa6b5ec | 683 | audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); |
4260f7c7 SW |
684 | |
685 | error = inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
686 | if (error) | |
687 | return error; | |
688 | if (IS_APPEND(dir)) | |
689 | return -EPERM; | |
690 | if (btrfs_check_sticky(dir, victim->d_inode)|| | |
691 | IS_APPEND(victim->d_inode)|| | |
692 | IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) | |
693 | return -EPERM; | |
694 | if (isdir) { | |
695 | if (!S_ISDIR(victim->d_inode->i_mode)) | |
696 | return -ENOTDIR; | |
697 | if (IS_ROOT(victim)) | |
698 | return -EBUSY; | |
699 | } else if (S_ISDIR(victim->d_inode->i_mode)) | |
700 | return -EISDIR; | |
701 | if (IS_DEADDIR(dir)) | |
702 | return -ENOENT; | |
703 | if (victim->d_flags & DCACHE_NFSFS_RENAMED) | |
704 | return -EBUSY; | |
705 | return 0; | |
706 | } | |
707 | ||
cb8e7090 CH |
708 | /* copy of may_create in fs/namei.c() */ |
709 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
710 | { | |
711 | if (child->d_inode) | |
712 | return -EEXIST; | |
713 | if (IS_DEADDIR(dir)) | |
714 | return -ENOENT; | |
715 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
716 | } | |
717 | ||
718 | /* | |
719 | * Create a new subvolume below @parent. This is largely modeled after | |
720 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
721 | * inside this filesystem so it's quite a bit simpler. | |
722 | */ | |
76dda93c YZ |
723 | static noinline int btrfs_mksubvol(struct path *parent, |
724 | char *name, int namelen, | |
72fd032e | 725 | struct btrfs_root *snap_src, |
6f72c7e2 | 726 | u64 *async_transid, bool readonly, |
8696c533 | 727 | struct btrfs_qgroup_inherit *inherit) |
cb8e7090 | 728 | { |
76dda93c | 729 | struct inode *dir = parent->dentry->d_inode; |
cb8e7090 CH |
730 | struct dentry *dentry; |
731 | int error; | |
732 | ||
5c50c9b8 DS |
733 | error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); |
734 | if (error == -EINTR) | |
735 | return error; | |
cb8e7090 CH |
736 | |
737 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
738 | error = PTR_ERR(dentry); | |
739 | if (IS_ERR(dentry)) | |
740 | goto out_unlock; | |
741 | ||
742 | error = -EEXIST; | |
743 | if (dentry->d_inode) | |
744 | goto out_dput; | |
745 | ||
76dda93c | 746 | error = btrfs_may_create(dir, dentry); |
cb8e7090 | 747 | if (error) |
a874a63e | 748 | goto out_dput; |
cb8e7090 | 749 | |
9c52057c CM |
750 | /* |
751 | * even if this name doesn't exist, we may get hash collisions. | |
752 | * check for them now when we can safely fail | |
753 | */ | |
754 | error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, | |
755 | dir->i_ino, name, | |
756 | namelen); | |
757 | if (error) | |
758 | goto out_dput; | |
759 | ||
76dda93c YZ |
760 | down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); |
761 | ||
762 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) | |
763 | goto out_up_read; | |
764 | ||
3de4586c | 765 | if (snap_src) { |
e9662f70 | 766 | error = create_snapshot(snap_src, dir, dentry, name, namelen, |
6f72c7e2 | 767 | async_transid, readonly, inherit); |
3de4586c | 768 | } else { |
d5c12070 MX |
769 | error = create_subvol(dir, dentry, name, namelen, |
770 | async_transid, inherit); | |
3de4586c | 771 | } |
76dda93c YZ |
772 | if (!error) |
773 | fsnotify_mkdir(dir, dentry); | |
774 | out_up_read: | |
775 | up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); | |
cb8e7090 CH |
776 | out_dput: |
777 | dput(dentry); | |
778 | out_unlock: | |
76dda93c | 779 | mutex_unlock(&dir->i_mutex); |
cb8e7090 CH |
780 | return error; |
781 | } | |
782 | ||
4cb5300b CM |
783 | /* |
784 | * When we're defragging a range, we don't want to kick it off again | |
785 | * if it is really just waiting for delalloc to send it down. | |
786 | * If we find a nice big extent or delalloc range for the bytes in the | |
787 | * file you want to defrag, we return 0 to let you know to skip this | |
788 | * part of the file | |
789 | */ | |
790 | static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) | |
791 | { | |
792 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
793 | struct extent_map *em = NULL; | |
794 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
795 | u64 end; | |
796 | ||
797 | read_lock(&em_tree->lock); | |
798 | em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); | |
799 | read_unlock(&em_tree->lock); | |
800 | ||
801 | if (em) { | |
802 | end = extent_map_end(em); | |
803 | free_extent_map(em); | |
804 | if (end - offset > thresh) | |
805 | return 0; | |
806 | } | |
807 | /* if we already have a nice delalloc here, just stop */ | |
808 | thresh /= 2; | |
809 | end = count_range_bits(io_tree, &offset, offset + thresh, | |
810 | thresh, EXTENT_DELALLOC, 1); | |
811 | if (end >= thresh) | |
812 | return 0; | |
813 | return 1; | |
814 | } | |
815 | ||
816 | /* | |
817 | * helper function to walk through a file and find extents | |
818 | * newer than a specific transid, and smaller than thresh. | |
819 | * | |
820 | * This is used by the defragging code to find new and small | |
821 | * extents | |
822 | */ | |
823 | static int find_new_extents(struct btrfs_root *root, | |
824 | struct inode *inode, u64 newer_than, | |
825 | u64 *off, int thresh) | |
826 | { | |
827 | struct btrfs_path *path; | |
828 | struct btrfs_key min_key; | |
829 | struct btrfs_key max_key; | |
830 | struct extent_buffer *leaf; | |
831 | struct btrfs_file_extent_item *extent; | |
832 | int type; | |
833 | int ret; | |
a4689d2b | 834 | u64 ino = btrfs_ino(inode); |
4cb5300b CM |
835 | |
836 | path = btrfs_alloc_path(); | |
837 | if (!path) | |
838 | return -ENOMEM; | |
839 | ||
a4689d2b | 840 | min_key.objectid = ino; |
4cb5300b CM |
841 | min_key.type = BTRFS_EXTENT_DATA_KEY; |
842 | min_key.offset = *off; | |
843 | ||
a4689d2b | 844 | max_key.objectid = ino; |
4cb5300b CM |
845 | max_key.type = (u8)-1; |
846 | max_key.offset = (u64)-1; | |
847 | ||
848 | path->keep_locks = 1; | |
849 | ||
850 | while(1) { | |
851 | ret = btrfs_search_forward(root, &min_key, &max_key, | |
de78b51a | 852 | path, newer_than); |
4cb5300b CM |
853 | if (ret != 0) |
854 | goto none; | |
a4689d2b | 855 | if (min_key.objectid != ino) |
4cb5300b CM |
856 | goto none; |
857 | if (min_key.type != BTRFS_EXTENT_DATA_KEY) | |
858 | goto none; | |
859 | ||
860 | leaf = path->nodes[0]; | |
861 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
862 | struct btrfs_file_extent_item); | |
863 | ||
864 | type = btrfs_file_extent_type(leaf, extent); | |
865 | if (type == BTRFS_FILE_EXTENT_REG && | |
866 | btrfs_file_extent_num_bytes(leaf, extent) < thresh && | |
867 | check_defrag_in_cache(inode, min_key.offset, thresh)) { | |
868 | *off = min_key.offset; | |
869 | btrfs_free_path(path); | |
870 | return 0; | |
871 | } | |
872 | ||
873 | if (min_key.offset == (u64)-1) | |
874 | goto none; | |
875 | ||
876 | min_key.offset++; | |
877 | btrfs_release_path(path); | |
878 | } | |
879 | none: | |
880 | btrfs_free_path(path); | |
881 | return -ENOENT; | |
882 | } | |
883 | ||
6c282eb4 | 884 | static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) |
17ce6ef8 LB |
885 | { |
886 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
6c282eb4 LZ |
887 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
888 | struct extent_map *em; | |
889 | u64 len = PAGE_CACHE_SIZE; | |
17ce6ef8 | 890 | |
6c282eb4 LZ |
891 | /* |
892 | * hopefully we have this extent in the tree already, try without | |
893 | * the full extent lock | |
894 | */ | |
17ce6ef8 | 895 | read_lock(&em_tree->lock); |
6c282eb4 | 896 | em = lookup_extent_mapping(em_tree, start, len); |
17ce6ef8 LB |
897 | read_unlock(&em_tree->lock); |
898 | ||
6c282eb4 LZ |
899 | if (!em) { |
900 | /* get the big lock and read metadata off disk */ | |
901 | lock_extent(io_tree, start, start + len - 1); | |
902 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); | |
903 | unlock_extent(io_tree, start, start + len - 1); | |
904 | ||
905 | if (IS_ERR(em)) | |
906 | return NULL; | |
907 | } | |
908 | ||
909 | return em; | |
910 | } | |
17ce6ef8 | 911 | |
6c282eb4 LZ |
912 | static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) |
913 | { | |
914 | struct extent_map *next; | |
915 | bool ret = true; | |
916 | ||
917 | /* this is the last extent */ | |
918 | if (em->start + em->len >= i_size_read(inode)) | |
919 | return false; | |
920 | ||
921 | next = defrag_lookup_extent(inode, em->start + em->len); | |
922 | if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) | |
923 | ret = false; | |
924 | ||
925 | free_extent_map(next); | |
17ce6ef8 LB |
926 | return ret; |
927 | } | |
928 | ||
6c282eb4 | 929 | static int should_defrag_range(struct inode *inode, u64 start, int thresh, |
a43a2111 AM |
930 | u64 *last_len, u64 *skip, u64 *defrag_end, |
931 | int compress) | |
940100a4 | 932 | { |
6c282eb4 | 933 | struct extent_map *em; |
940100a4 | 934 | int ret = 1; |
6c282eb4 | 935 | bool next_mergeable = true; |
940100a4 CM |
936 | |
937 | /* | |
008873ea | 938 | * make sure that once we start defragging an extent, we keep on |
940100a4 CM |
939 | * defragging it |
940 | */ | |
941 | if (start < *defrag_end) | |
942 | return 1; | |
943 | ||
944 | *skip = 0; | |
945 | ||
6c282eb4 LZ |
946 | em = defrag_lookup_extent(inode, start); |
947 | if (!em) | |
948 | return 0; | |
940100a4 CM |
949 | |
950 | /* this will cover holes, and inline extents */ | |
17ce6ef8 | 951 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { |
940100a4 | 952 | ret = 0; |
17ce6ef8 LB |
953 | goto out; |
954 | } | |
955 | ||
6c282eb4 | 956 | next_mergeable = defrag_check_next_extent(inode, em); |
940100a4 CM |
957 | |
958 | /* | |
6c282eb4 LZ |
959 | * we hit a real extent, if it is big or the next extent is not a |
960 | * real extent, don't bother defragging it | |
940100a4 | 961 | */ |
a43a2111 | 962 | if (!compress && (*last_len == 0 || *last_len >= thresh) && |
6c282eb4 | 963 | (em->len >= thresh || !next_mergeable)) |
940100a4 | 964 | ret = 0; |
17ce6ef8 | 965 | out: |
940100a4 CM |
966 | /* |
967 | * last_len ends up being a counter of how many bytes we've defragged. | |
968 | * every time we choose not to defrag an extent, we reset *last_len | |
969 | * so that the next tiny extent will force a defrag. | |
970 | * | |
971 | * The end result of this is that tiny extents before a single big | |
972 | * extent will force at least part of that big extent to be defragged. | |
973 | */ | |
974 | if (ret) { | |
940100a4 CM |
975 | *defrag_end = extent_map_end(em); |
976 | } else { | |
977 | *last_len = 0; | |
978 | *skip = extent_map_end(em); | |
979 | *defrag_end = 0; | |
980 | } | |
981 | ||
982 | free_extent_map(em); | |
983 | return ret; | |
984 | } | |
985 | ||
4cb5300b CM |
986 | /* |
987 | * it doesn't do much good to defrag one or two pages | |
988 | * at a time. This pulls in a nice chunk of pages | |
989 | * to COW and defrag. | |
990 | * | |
991 | * It also makes sure the delalloc code has enough | |
992 | * dirty data to avoid making new small extents as part | |
993 | * of the defrag | |
994 | * | |
995 | * It's a good idea to start RA on this range | |
996 | * before calling this. | |
997 | */ | |
998 | static int cluster_pages_for_defrag(struct inode *inode, | |
999 | struct page **pages, | |
1000 | unsigned long start_index, | |
1001 | int num_pages) | |
f46b5a66 | 1002 | { |
4cb5300b CM |
1003 | unsigned long file_end; |
1004 | u64 isize = i_size_read(inode); | |
1005 | u64 page_start; | |
1006 | u64 page_end; | |
1f12bd06 | 1007 | u64 page_cnt; |
4cb5300b CM |
1008 | int ret; |
1009 | int i; | |
1010 | int i_done; | |
3eaa2885 | 1011 | struct btrfs_ordered_extent *ordered; |
4cb5300b | 1012 | struct extent_state *cached_state = NULL; |
600a45e1 | 1013 | struct extent_io_tree *tree; |
3b16a4e3 | 1014 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
4cb5300b | 1015 | |
4cb5300b | 1016 | file_end = (isize - 1) >> PAGE_CACHE_SHIFT; |
1f12bd06 LB |
1017 | if (!isize || start_index > file_end) |
1018 | return 0; | |
1019 | ||
1020 | page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); | |
4cb5300b CM |
1021 | |
1022 | ret = btrfs_delalloc_reserve_space(inode, | |
1f12bd06 | 1023 | page_cnt << PAGE_CACHE_SHIFT); |
4cb5300b CM |
1024 | if (ret) |
1025 | return ret; | |
4cb5300b | 1026 | i_done = 0; |
600a45e1 | 1027 | tree = &BTRFS_I(inode)->io_tree; |
4cb5300b CM |
1028 | |
1029 | /* step one, lock all the pages */ | |
1f12bd06 | 1030 | for (i = 0; i < page_cnt; i++) { |
4cb5300b | 1031 | struct page *page; |
600a45e1 | 1032 | again: |
a94733d0 | 1033 | page = find_or_create_page(inode->i_mapping, |
600a45e1 | 1034 | start_index + i, mask); |
4cb5300b CM |
1035 | if (!page) |
1036 | break; | |
1037 | ||
600a45e1 MX |
1038 | page_start = page_offset(page); |
1039 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
1040 | while (1) { | |
d0082371 | 1041 | lock_extent(tree, page_start, page_end); |
600a45e1 MX |
1042 | ordered = btrfs_lookup_ordered_extent(inode, |
1043 | page_start); | |
d0082371 | 1044 | unlock_extent(tree, page_start, page_end); |
600a45e1 MX |
1045 | if (!ordered) |
1046 | break; | |
1047 | ||
1048 | unlock_page(page); | |
1049 | btrfs_start_ordered_extent(inode, ordered, 1); | |
1050 | btrfs_put_ordered_extent(ordered); | |
1051 | lock_page(page); | |
1f12bd06 LB |
1052 | /* |
1053 | * we unlocked the page above, so we need check if | |
1054 | * it was released or not. | |
1055 | */ | |
1056 | if (page->mapping != inode->i_mapping) { | |
1057 | unlock_page(page); | |
1058 | page_cache_release(page); | |
1059 | goto again; | |
1060 | } | |
600a45e1 MX |
1061 | } |
1062 | ||
4cb5300b CM |
1063 | if (!PageUptodate(page)) { |
1064 | btrfs_readpage(NULL, page); | |
1065 | lock_page(page); | |
1066 | if (!PageUptodate(page)) { | |
1067 | unlock_page(page); | |
1068 | page_cache_release(page); | |
1069 | ret = -EIO; | |
1070 | break; | |
1071 | } | |
1072 | } | |
600a45e1 | 1073 | |
600a45e1 MX |
1074 | if (page->mapping != inode->i_mapping) { |
1075 | unlock_page(page); | |
1076 | page_cache_release(page); | |
1077 | goto again; | |
1078 | } | |
1079 | ||
4cb5300b CM |
1080 | pages[i] = page; |
1081 | i_done++; | |
1082 | } | |
1083 | if (!i_done || ret) | |
1084 | goto out; | |
1085 | ||
1086 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
1087 | goto out; | |
1088 | ||
1089 | /* | |
1090 | * so now we have a nice long stream of locked | |
1091 | * and up to date pages, lets wait on them | |
1092 | */ | |
1093 | for (i = 0; i < i_done; i++) | |
1094 | wait_on_page_writeback(pages[i]); | |
1095 | ||
1096 | page_start = page_offset(pages[0]); | |
1097 | page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; | |
1098 | ||
1099 | lock_extent_bits(&BTRFS_I(inode)->io_tree, | |
d0082371 | 1100 | page_start, page_end - 1, 0, &cached_state); |
4cb5300b CM |
1101 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, |
1102 | page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | | |
9e8a4a8b LB |
1103 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, |
1104 | &cached_state, GFP_NOFS); | |
4cb5300b | 1105 | |
1f12bd06 | 1106 | if (i_done != page_cnt) { |
9e0baf60 JB |
1107 | spin_lock(&BTRFS_I(inode)->lock); |
1108 | BTRFS_I(inode)->outstanding_extents++; | |
1109 | spin_unlock(&BTRFS_I(inode)->lock); | |
4cb5300b | 1110 | btrfs_delalloc_release_space(inode, |
1f12bd06 | 1111 | (page_cnt - i_done) << PAGE_CACHE_SHIFT); |
4cb5300b CM |
1112 | } |
1113 | ||
1114 | ||
9e8a4a8b LB |
1115 | set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, |
1116 | &cached_state, GFP_NOFS); | |
4cb5300b CM |
1117 | |
1118 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, | |
1119 | page_start, page_end - 1, &cached_state, | |
1120 | GFP_NOFS); | |
1121 | ||
1122 | for (i = 0; i < i_done; i++) { | |
1123 | clear_page_dirty_for_io(pages[i]); | |
1124 | ClearPageChecked(pages[i]); | |
1125 | set_page_extent_mapped(pages[i]); | |
1126 | set_page_dirty(pages[i]); | |
1127 | unlock_page(pages[i]); | |
1128 | page_cache_release(pages[i]); | |
1129 | } | |
1130 | return i_done; | |
1131 | out: | |
1132 | for (i = 0; i < i_done; i++) { | |
1133 | unlock_page(pages[i]); | |
1134 | page_cache_release(pages[i]); | |
1135 | } | |
1f12bd06 | 1136 | btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); |
4cb5300b CM |
1137 | return ret; |
1138 | ||
1139 | } | |
1140 | ||
1141 | int btrfs_defrag_file(struct inode *inode, struct file *file, | |
1142 | struct btrfs_ioctl_defrag_range_args *range, | |
1143 | u64 newer_than, unsigned long max_to_defrag) | |
1144 | { | |
1145 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4cb5300b | 1146 | struct file_ra_state *ra = NULL; |
f46b5a66 | 1147 | unsigned long last_index; |
151a31b2 | 1148 | u64 isize = i_size_read(inode); |
940100a4 CM |
1149 | u64 last_len = 0; |
1150 | u64 skip = 0; | |
1151 | u64 defrag_end = 0; | |
4cb5300b | 1152 | u64 newer_off = range->start; |
f46b5a66 | 1153 | unsigned long i; |
008873ea | 1154 | unsigned long ra_index = 0; |
f46b5a66 | 1155 | int ret; |
4cb5300b | 1156 | int defrag_count = 0; |
1a419d85 | 1157 | int compress_type = BTRFS_COMPRESS_ZLIB; |
4cb5300b | 1158 | int extent_thresh = range->extent_thresh; |
008873ea LZ |
1159 | int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; |
1160 | int cluster = max_cluster; | |
4cb5300b CM |
1161 | u64 new_align = ~((u64)128 * 1024 - 1); |
1162 | struct page **pages = NULL; | |
1163 | ||
0abd5b17 LB |
1164 | if (isize == 0) |
1165 | return 0; | |
1166 | ||
1167 | if (range->start >= isize) | |
1168 | return -EINVAL; | |
1a419d85 LZ |
1169 | |
1170 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { | |
1171 | if (range->compress_type > BTRFS_COMPRESS_TYPES) | |
1172 | return -EINVAL; | |
1173 | if (range->compress_type) | |
1174 | compress_type = range->compress_type; | |
1175 | } | |
f46b5a66 | 1176 | |
0abd5b17 LB |
1177 | if (extent_thresh == 0) |
1178 | extent_thresh = 256 * 1024; | |
940100a4 | 1179 | |
4cb5300b CM |
1180 | /* |
1181 | * if we were not given a file, allocate a readahead | |
1182 | * context | |
1183 | */ | |
1184 | if (!file) { | |
1185 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
1186 | if (!ra) | |
1187 | return -ENOMEM; | |
1188 | file_ra_state_init(ra, inode->i_mapping); | |
1189 | } else { | |
1190 | ra = &file->f_ra; | |
1191 | } | |
1192 | ||
008873ea | 1193 | pages = kmalloc(sizeof(struct page *) * max_cluster, |
4cb5300b CM |
1194 | GFP_NOFS); |
1195 | if (!pages) { | |
1196 | ret = -ENOMEM; | |
1197 | goto out_ra; | |
1198 | } | |
1199 | ||
1200 | /* find the last page to defrag */ | |
1e701a32 | 1201 | if (range->start + range->len > range->start) { |
151a31b2 | 1202 | last_index = min_t(u64, isize - 1, |
1e701a32 CM |
1203 | range->start + range->len - 1) >> PAGE_CACHE_SHIFT; |
1204 | } else { | |
151a31b2 | 1205 | last_index = (isize - 1) >> PAGE_CACHE_SHIFT; |
1e701a32 CM |
1206 | } |
1207 | ||
4cb5300b CM |
1208 | if (newer_than) { |
1209 | ret = find_new_extents(root, inode, newer_than, | |
1210 | &newer_off, 64 * 1024); | |
1211 | if (!ret) { | |
1212 | range->start = newer_off; | |
1213 | /* | |
1214 | * we always align our defrag to help keep | |
1215 | * the extents in the file evenly spaced | |
1216 | */ | |
1217 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; | |
4cb5300b CM |
1218 | } else |
1219 | goto out_ra; | |
1220 | } else { | |
1221 | i = range->start >> PAGE_CACHE_SHIFT; | |
1222 | } | |
1223 | if (!max_to_defrag) | |
7ec31b54 | 1224 | max_to_defrag = last_index + 1; |
4cb5300b | 1225 | |
2a0f7f57 LZ |
1226 | /* |
1227 | * make writeback starts from i, so the defrag range can be | |
1228 | * written sequentially. | |
1229 | */ | |
1230 | if (i < inode->i_mapping->writeback_index) | |
1231 | inode->i_mapping->writeback_index = i; | |
1232 | ||
f7f43cc8 CM |
1233 | while (i <= last_index && defrag_count < max_to_defrag && |
1234 | (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> | |
1235 | PAGE_CACHE_SHIFT)) { | |
4cb5300b CM |
1236 | /* |
1237 | * make sure we stop running if someone unmounts | |
1238 | * the FS | |
1239 | */ | |
1240 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
1241 | break; | |
1242 | ||
210549eb DS |
1243 | if (btrfs_defrag_cancelled(root->fs_info)) { |
1244 | printk(KERN_DEBUG "btrfs: defrag_file cancelled\n"); | |
1245 | ret = -EAGAIN; | |
1246 | break; | |
1247 | } | |
1248 | ||
66c26892 | 1249 | if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, |
6c282eb4 | 1250 | extent_thresh, &last_len, &skip, |
a43a2111 AM |
1251 | &defrag_end, range->flags & |
1252 | BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
940100a4 CM |
1253 | unsigned long next; |
1254 | /* | |
1255 | * the should_defrag function tells us how much to skip | |
1256 | * bump our counter by the suggested amount | |
1257 | */ | |
1258 | next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
1259 | i = max(i + 1, next); | |
1260 | continue; | |
1261 | } | |
008873ea LZ |
1262 | |
1263 | if (!newer_than) { | |
1264 | cluster = (PAGE_CACHE_ALIGN(defrag_end) >> | |
1265 | PAGE_CACHE_SHIFT) - i; | |
1266 | cluster = min(cluster, max_cluster); | |
1267 | } else { | |
1268 | cluster = max_cluster; | |
1269 | } | |
1270 | ||
1e701a32 | 1271 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) |
1a419d85 | 1272 | BTRFS_I(inode)->force_compress = compress_type; |
940100a4 | 1273 | |
008873ea LZ |
1274 | if (i + cluster > ra_index) { |
1275 | ra_index = max(i, ra_index); | |
1276 | btrfs_force_ra(inode->i_mapping, ra, file, ra_index, | |
1277 | cluster); | |
1278 | ra_index += max_cluster; | |
1279 | } | |
940100a4 | 1280 | |
ecb8bea8 | 1281 | mutex_lock(&inode->i_mutex); |
008873ea | 1282 | ret = cluster_pages_for_defrag(inode, pages, i, cluster); |
ecb8bea8 LB |
1283 | if (ret < 0) { |
1284 | mutex_unlock(&inode->i_mutex); | |
4cb5300b | 1285 | goto out_ra; |
ecb8bea8 | 1286 | } |
4cb5300b CM |
1287 | |
1288 | defrag_count += ret; | |
d0e1d66b | 1289 | balance_dirty_pages_ratelimited(inode->i_mapping); |
ecb8bea8 | 1290 | mutex_unlock(&inode->i_mutex); |
4cb5300b CM |
1291 | |
1292 | if (newer_than) { | |
1293 | if (newer_off == (u64)-1) | |
1294 | break; | |
1295 | ||
e1f041e1 LB |
1296 | if (ret > 0) |
1297 | i += ret; | |
1298 | ||
4cb5300b CM |
1299 | newer_off = max(newer_off + 1, |
1300 | (u64)i << PAGE_CACHE_SHIFT); | |
1301 | ||
1302 | ret = find_new_extents(root, inode, | |
1303 | newer_than, &newer_off, | |
1304 | 64 * 1024); | |
1305 | if (!ret) { | |
1306 | range->start = newer_off; | |
1307 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; | |
4cb5300b CM |
1308 | } else { |
1309 | break; | |
f46b5a66 | 1310 | } |
4cb5300b | 1311 | } else { |
008873ea | 1312 | if (ret > 0) { |
cbcc8326 | 1313 | i += ret; |
008873ea LZ |
1314 | last_len += ret << PAGE_CACHE_SHIFT; |
1315 | } else { | |
cbcc8326 | 1316 | i++; |
008873ea LZ |
1317 | last_len = 0; |
1318 | } | |
f46b5a66 | 1319 | } |
f46b5a66 CH |
1320 | } |
1321 | ||
1e701a32 CM |
1322 | if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) |
1323 | filemap_flush(inode->i_mapping); | |
1324 | ||
1325 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
1326 | /* the filemap_flush will queue IO into the worker threads, but | |
1327 | * we have to make sure the IO is actually started and that | |
1328 | * ordered extents get created before we return | |
1329 | */ | |
1330 | atomic_inc(&root->fs_info->async_submit_draining); | |
1331 | while (atomic_read(&root->fs_info->nr_async_submits) || | |
1332 | atomic_read(&root->fs_info->async_delalloc_pages)) { | |
1333 | wait_event(root->fs_info->async_submit_wait, | |
1334 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && | |
1335 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); | |
1336 | } | |
1337 | atomic_dec(&root->fs_info->async_submit_draining); | |
1338 | ||
1339 | mutex_lock(&inode->i_mutex); | |
261507a0 | 1340 | BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; |
1e701a32 CM |
1341 | mutex_unlock(&inode->i_mutex); |
1342 | } | |
1343 | ||
1a419d85 | 1344 | if (range->compress_type == BTRFS_COMPRESS_LZO) { |
2b0ce2c2 | 1345 | btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); |
1a419d85 LZ |
1346 | } |
1347 | ||
60ccf82f | 1348 | ret = defrag_count; |
940100a4 | 1349 | |
4cb5300b CM |
1350 | out_ra: |
1351 | if (!file) | |
1352 | kfree(ra); | |
1353 | kfree(pages); | |
940100a4 | 1354 | return ret; |
f46b5a66 CH |
1355 | } |
1356 | ||
198605a8 | 1357 | static noinline int btrfs_ioctl_resize(struct file *file, |
76dda93c | 1358 | void __user *arg) |
f46b5a66 CH |
1359 | { |
1360 | u64 new_size; | |
1361 | u64 old_size; | |
1362 | u64 devid = 1; | |
496ad9aa | 1363 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
f46b5a66 CH |
1364 | struct btrfs_ioctl_vol_args *vol_args; |
1365 | struct btrfs_trans_handle *trans; | |
1366 | struct btrfs_device *device = NULL; | |
1367 | char *sizestr; | |
1368 | char *devstr = NULL; | |
1369 | int ret = 0; | |
f46b5a66 CH |
1370 | int mod = 0; |
1371 | ||
e441d54d CM |
1372 | if (!capable(CAP_SYS_ADMIN)) |
1373 | return -EPERM; | |
1374 | ||
198605a8 MX |
1375 | ret = mnt_want_write_file(file); |
1376 | if (ret) | |
1377 | return ret; | |
1378 | ||
5ac00add SB |
1379 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
1380 | 1)) { | |
1381 | pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); | |
97547676 | 1382 | mnt_drop_write_file(file); |
2c0c9da0 | 1383 | return -EINVAL; |
c9e9f97b ID |
1384 | } |
1385 | ||
5ac00add | 1386 | mutex_lock(&root->fs_info->volume_mutex); |
dae7b665 | 1387 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
1388 | if (IS_ERR(vol_args)) { |
1389 | ret = PTR_ERR(vol_args); | |
1390 | goto out; | |
1391 | } | |
5516e595 MF |
1392 | |
1393 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 1394 | |
f46b5a66 CH |
1395 | sizestr = vol_args->name; |
1396 | devstr = strchr(sizestr, ':'); | |
1397 | if (devstr) { | |
1398 | char *end; | |
1399 | sizestr = devstr + 1; | |
1400 | *devstr = '\0'; | |
1401 | devstr = vol_args->name; | |
1402 | devid = simple_strtoull(devstr, &end, 10); | |
dfd79829 MX |
1403 | if (!devid) { |
1404 | ret = -EINVAL; | |
1405 | goto out_free; | |
1406 | } | |
5bb14682 | 1407 | printk(KERN_INFO "btrfs: resizing devid %llu\n", |
21380931 | 1408 | (unsigned long long)devid); |
f46b5a66 | 1409 | } |
dba60f3f | 1410 | |
aa1b8cd4 | 1411 | device = btrfs_find_device(root->fs_info, devid, NULL, NULL); |
f46b5a66 | 1412 | if (!device) { |
5bb14682 | 1413 | printk(KERN_INFO "btrfs: resizer unable to find device %llu\n", |
21380931 | 1414 | (unsigned long long)devid); |
dfd79829 | 1415 | ret = -ENODEV; |
c9e9f97b | 1416 | goto out_free; |
f46b5a66 | 1417 | } |
dba60f3f MX |
1418 | |
1419 | if (!device->writeable) { | |
4e42ae1b | 1420 | printk(KERN_INFO "btrfs: resizer unable to apply on " |
dba60f3f | 1421 | "readonly device %llu\n", |
a8c4a33b | 1422 | (unsigned long long)devid); |
dfd79829 | 1423 | ret = -EPERM; |
4e42ae1b LB |
1424 | goto out_free; |
1425 | } | |
1426 | ||
f46b5a66 CH |
1427 | if (!strcmp(sizestr, "max")) |
1428 | new_size = device->bdev->bd_inode->i_size; | |
1429 | else { | |
1430 | if (sizestr[0] == '-') { | |
1431 | mod = -1; | |
1432 | sizestr++; | |
1433 | } else if (sizestr[0] == '+') { | |
1434 | mod = 1; | |
1435 | sizestr++; | |
1436 | } | |
91748467 | 1437 | new_size = memparse(sizestr, NULL); |
f46b5a66 CH |
1438 | if (new_size == 0) { |
1439 | ret = -EINVAL; | |
c9e9f97b | 1440 | goto out_free; |
f46b5a66 CH |
1441 | } |
1442 | } | |
1443 | ||
63a212ab | 1444 | if (device->is_tgtdev_for_dev_replace) { |
dfd79829 | 1445 | ret = -EPERM; |
63a212ab SB |
1446 | goto out_free; |
1447 | } | |
1448 | ||
f46b5a66 CH |
1449 | old_size = device->total_bytes; |
1450 | ||
1451 | if (mod < 0) { | |
1452 | if (new_size > old_size) { | |
1453 | ret = -EINVAL; | |
c9e9f97b | 1454 | goto out_free; |
f46b5a66 CH |
1455 | } |
1456 | new_size = old_size - new_size; | |
1457 | } else if (mod > 0) { | |
1458 | new_size = old_size + new_size; | |
1459 | } | |
1460 | ||
1461 | if (new_size < 256 * 1024 * 1024) { | |
1462 | ret = -EINVAL; | |
c9e9f97b | 1463 | goto out_free; |
f46b5a66 CH |
1464 | } |
1465 | if (new_size > device->bdev->bd_inode->i_size) { | |
1466 | ret = -EFBIG; | |
c9e9f97b | 1467 | goto out_free; |
f46b5a66 CH |
1468 | } |
1469 | ||
1470 | do_div(new_size, root->sectorsize); | |
1471 | new_size *= root->sectorsize; | |
1472 | ||
606686ee JB |
1473 | printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n", |
1474 | rcu_str_deref(device->name), | |
1475 | (unsigned long long)new_size); | |
f46b5a66 CH |
1476 | |
1477 | if (new_size > old_size) { | |
a22285a6 | 1478 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1479 | if (IS_ERR(trans)) { |
1480 | ret = PTR_ERR(trans); | |
c9e9f97b | 1481 | goto out_free; |
98d5dc13 | 1482 | } |
f46b5a66 CH |
1483 | ret = btrfs_grow_device(trans, device, new_size); |
1484 | btrfs_commit_transaction(trans, root); | |
ece7d20e | 1485 | } else if (new_size < old_size) { |
f46b5a66 | 1486 | ret = btrfs_shrink_device(device, new_size); |
0253f40e | 1487 | } /* equal, nothing need to do */ |
f46b5a66 | 1488 | |
c9e9f97b | 1489 | out_free: |
f46b5a66 | 1490 | kfree(vol_args); |
c9e9f97b ID |
1491 | out: |
1492 | mutex_unlock(&root->fs_info->volume_mutex); | |
5ac00add | 1493 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
18f39c41 | 1494 | mnt_drop_write_file(file); |
f46b5a66 CH |
1495 | return ret; |
1496 | } | |
1497 | ||
72fd032e | 1498 | static noinline int btrfs_ioctl_snap_create_transid(struct file *file, |
6f72c7e2 AJ |
1499 | char *name, unsigned long fd, int subvol, |
1500 | u64 *transid, bool readonly, | |
8696c533 | 1501 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 | 1502 | { |
f46b5a66 | 1503 | int namelen; |
3de4586c | 1504 | int ret = 0; |
f46b5a66 | 1505 | |
a874a63e LB |
1506 | ret = mnt_want_write_file(file); |
1507 | if (ret) | |
1508 | goto out; | |
1509 | ||
72fd032e SW |
1510 | namelen = strlen(name); |
1511 | if (strchr(name, '/')) { | |
f46b5a66 | 1512 | ret = -EINVAL; |
a874a63e | 1513 | goto out_drop_write; |
f46b5a66 CH |
1514 | } |
1515 | ||
16780cab CM |
1516 | if (name[0] == '.' && |
1517 | (namelen == 1 || (name[1] == '.' && namelen == 2))) { | |
1518 | ret = -EEXIST; | |
a874a63e | 1519 | goto out_drop_write; |
16780cab CM |
1520 | } |
1521 | ||
3de4586c | 1522 | if (subvol) { |
72fd032e | 1523 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
6f72c7e2 | 1524 | NULL, transid, readonly, inherit); |
cb8e7090 | 1525 | } else { |
2903ff01 | 1526 | struct fd src = fdget(fd); |
3de4586c | 1527 | struct inode *src_inode; |
2903ff01 | 1528 | if (!src.file) { |
3de4586c | 1529 | ret = -EINVAL; |
a874a63e | 1530 | goto out_drop_write; |
3de4586c CM |
1531 | } |
1532 | ||
496ad9aa AV |
1533 | src_inode = file_inode(src.file); |
1534 | if (src_inode->i_sb != file_inode(file)->i_sb) { | |
d397712b CM |
1535 | printk(KERN_INFO "btrfs: Snapshot src from " |
1536 | "another FS\n"); | |
3de4586c | 1537 | ret = -EINVAL; |
ecd18815 AV |
1538 | } else { |
1539 | ret = btrfs_mksubvol(&file->f_path, name, namelen, | |
1540 | BTRFS_I(src_inode)->root, | |
1541 | transid, readonly, inherit); | |
3de4586c | 1542 | } |
2903ff01 | 1543 | fdput(src); |
cb8e7090 | 1544 | } |
a874a63e LB |
1545 | out_drop_write: |
1546 | mnt_drop_write_file(file); | |
f46b5a66 | 1547 | out: |
72fd032e SW |
1548 | return ret; |
1549 | } | |
1550 | ||
1551 | static noinline int btrfs_ioctl_snap_create(struct file *file, | |
fa0d2b9b | 1552 | void __user *arg, int subvol) |
72fd032e | 1553 | { |
fa0d2b9b | 1554 | struct btrfs_ioctl_vol_args *vol_args; |
72fd032e SW |
1555 | int ret; |
1556 | ||
fa0d2b9b LZ |
1557 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1558 | if (IS_ERR(vol_args)) | |
1559 | return PTR_ERR(vol_args); | |
1560 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
72fd032e | 1561 | |
fa0d2b9b | 1562 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, |
b83cc969 | 1563 | vol_args->fd, subvol, |
6f72c7e2 | 1564 | NULL, false, NULL); |
fdfb1e4f | 1565 | |
fa0d2b9b LZ |
1566 | kfree(vol_args); |
1567 | return ret; | |
1568 | } | |
fdfb1e4f | 1569 | |
fa0d2b9b LZ |
1570 | static noinline int btrfs_ioctl_snap_create_v2(struct file *file, |
1571 | void __user *arg, int subvol) | |
1572 | { | |
1573 | struct btrfs_ioctl_vol_args_v2 *vol_args; | |
1574 | int ret; | |
1575 | u64 transid = 0; | |
1576 | u64 *ptr = NULL; | |
b83cc969 | 1577 | bool readonly = false; |
6f72c7e2 | 1578 | struct btrfs_qgroup_inherit *inherit = NULL; |
75eaa0e2 | 1579 | |
fa0d2b9b LZ |
1580 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1581 | if (IS_ERR(vol_args)) | |
1582 | return PTR_ERR(vol_args); | |
1583 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; | |
75eaa0e2 | 1584 | |
b83cc969 | 1585 | if (vol_args->flags & |
6f72c7e2 AJ |
1586 | ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | |
1587 | BTRFS_SUBVOL_QGROUP_INHERIT)) { | |
b83cc969 | 1588 | ret = -EOPNOTSUPP; |
fa0d2b9b | 1589 | goto out; |
72fd032e | 1590 | } |
fa0d2b9b LZ |
1591 | |
1592 | if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) | |
1593 | ptr = &transid; | |
b83cc969 LZ |
1594 | if (vol_args->flags & BTRFS_SUBVOL_RDONLY) |
1595 | readonly = true; | |
6f72c7e2 AJ |
1596 | if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { |
1597 | if (vol_args->size > PAGE_CACHE_SIZE) { | |
1598 | ret = -EINVAL; | |
1599 | goto out; | |
1600 | } | |
1601 | inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); | |
1602 | if (IS_ERR(inherit)) { | |
1603 | ret = PTR_ERR(inherit); | |
1604 | goto out; | |
1605 | } | |
1606 | } | |
fa0d2b9b LZ |
1607 | |
1608 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, | |
6f72c7e2 | 1609 | vol_args->fd, subvol, ptr, |
8696c533 | 1610 | readonly, inherit); |
fa0d2b9b LZ |
1611 | |
1612 | if (ret == 0 && ptr && | |
1613 | copy_to_user(arg + | |
1614 | offsetof(struct btrfs_ioctl_vol_args_v2, | |
1615 | transid), ptr, sizeof(*ptr))) | |
1616 | ret = -EFAULT; | |
fdfb1e4f | 1617 | out: |
f46b5a66 | 1618 | kfree(vol_args); |
6f72c7e2 | 1619 | kfree(inherit); |
f46b5a66 CH |
1620 | return ret; |
1621 | } | |
1622 | ||
0caa102d LZ |
1623 | static noinline int btrfs_ioctl_subvol_getflags(struct file *file, |
1624 | void __user *arg) | |
1625 | { | |
496ad9aa | 1626 | struct inode *inode = file_inode(file); |
0caa102d LZ |
1627 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1628 | int ret = 0; | |
1629 | u64 flags = 0; | |
1630 | ||
33345d01 | 1631 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) |
0caa102d LZ |
1632 | return -EINVAL; |
1633 | ||
1634 | down_read(&root->fs_info->subvol_sem); | |
1635 | if (btrfs_root_readonly(root)) | |
1636 | flags |= BTRFS_SUBVOL_RDONLY; | |
1637 | up_read(&root->fs_info->subvol_sem); | |
1638 | ||
1639 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
1640 | ret = -EFAULT; | |
1641 | ||
1642 | return ret; | |
1643 | } | |
1644 | ||
1645 | static noinline int btrfs_ioctl_subvol_setflags(struct file *file, | |
1646 | void __user *arg) | |
1647 | { | |
496ad9aa | 1648 | struct inode *inode = file_inode(file); |
0caa102d LZ |
1649 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1650 | struct btrfs_trans_handle *trans; | |
1651 | u64 root_flags; | |
1652 | u64 flags; | |
1653 | int ret = 0; | |
1654 | ||
b9ca0664 LB |
1655 | ret = mnt_want_write_file(file); |
1656 | if (ret) | |
1657 | goto out; | |
0caa102d | 1658 | |
b9ca0664 LB |
1659 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
1660 | ret = -EINVAL; | |
1661 | goto out_drop_write; | |
1662 | } | |
0caa102d | 1663 | |
b9ca0664 LB |
1664 | if (copy_from_user(&flags, arg, sizeof(flags))) { |
1665 | ret = -EFAULT; | |
1666 | goto out_drop_write; | |
1667 | } | |
0caa102d | 1668 | |
b9ca0664 LB |
1669 | if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { |
1670 | ret = -EINVAL; | |
1671 | goto out_drop_write; | |
1672 | } | |
0caa102d | 1673 | |
b9ca0664 LB |
1674 | if (flags & ~BTRFS_SUBVOL_RDONLY) { |
1675 | ret = -EOPNOTSUPP; | |
1676 | goto out_drop_write; | |
1677 | } | |
0caa102d | 1678 | |
b9ca0664 LB |
1679 | if (!inode_owner_or_capable(inode)) { |
1680 | ret = -EACCES; | |
1681 | goto out_drop_write; | |
1682 | } | |
b4dc2b8c | 1683 | |
0caa102d LZ |
1684 | down_write(&root->fs_info->subvol_sem); |
1685 | ||
1686 | /* nothing to do */ | |
1687 | if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) | |
b9ca0664 | 1688 | goto out_drop_sem; |
0caa102d LZ |
1689 | |
1690 | root_flags = btrfs_root_flags(&root->root_item); | |
1691 | if (flags & BTRFS_SUBVOL_RDONLY) | |
1692 | btrfs_set_root_flags(&root->root_item, | |
1693 | root_flags | BTRFS_ROOT_SUBVOL_RDONLY); | |
1694 | else | |
1695 | btrfs_set_root_flags(&root->root_item, | |
1696 | root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); | |
1697 | ||
1698 | trans = btrfs_start_transaction(root, 1); | |
1699 | if (IS_ERR(trans)) { | |
1700 | ret = PTR_ERR(trans); | |
1701 | goto out_reset; | |
1702 | } | |
1703 | ||
b4dc2b8c | 1704 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
0caa102d LZ |
1705 | &root->root_key, &root->root_item); |
1706 | ||
1707 | btrfs_commit_transaction(trans, root); | |
1708 | out_reset: | |
1709 | if (ret) | |
1710 | btrfs_set_root_flags(&root->root_item, root_flags); | |
b9ca0664 | 1711 | out_drop_sem: |
0caa102d | 1712 | up_write(&root->fs_info->subvol_sem); |
b9ca0664 LB |
1713 | out_drop_write: |
1714 | mnt_drop_write_file(file); | |
1715 | out: | |
0caa102d LZ |
1716 | return ret; |
1717 | } | |
1718 | ||
76dda93c YZ |
1719 | /* |
1720 | * helper to check if the subvolume references other subvolumes | |
1721 | */ | |
1722 | static noinline int may_destroy_subvol(struct btrfs_root *root) | |
1723 | { | |
1724 | struct btrfs_path *path; | |
1725 | struct btrfs_key key; | |
1726 | int ret; | |
1727 | ||
1728 | path = btrfs_alloc_path(); | |
1729 | if (!path) | |
1730 | return -ENOMEM; | |
1731 | ||
1732 | key.objectid = root->root_key.objectid; | |
1733 | key.type = BTRFS_ROOT_REF_KEY; | |
1734 | key.offset = (u64)-1; | |
1735 | ||
1736 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, | |
1737 | &key, path, 0, 0); | |
1738 | if (ret < 0) | |
1739 | goto out; | |
1740 | BUG_ON(ret == 0); | |
1741 | ||
1742 | ret = 0; | |
1743 | if (path->slots[0] > 0) { | |
1744 | path->slots[0]--; | |
1745 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1746 | if (key.objectid == root->root_key.objectid && | |
1747 | key.type == BTRFS_ROOT_REF_KEY) | |
1748 | ret = -ENOTEMPTY; | |
1749 | } | |
1750 | out: | |
1751 | btrfs_free_path(path); | |
1752 | return ret; | |
1753 | } | |
1754 | ||
ac8e9819 CM |
1755 | static noinline int key_in_sk(struct btrfs_key *key, |
1756 | struct btrfs_ioctl_search_key *sk) | |
1757 | { | |
abc6e134 CM |
1758 | struct btrfs_key test; |
1759 | int ret; | |
1760 | ||
1761 | test.objectid = sk->min_objectid; | |
1762 | test.type = sk->min_type; | |
1763 | test.offset = sk->min_offset; | |
1764 | ||
1765 | ret = btrfs_comp_cpu_keys(key, &test); | |
1766 | if (ret < 0) | |
ac8e9819 | 1767 | return 0; |
abc6e134 CM |
1768 | |
1769 | test.objectid = sk->max_objectid; | |
1770 | test.type = sk->max_type; | |
1771 | test.offset = sk->max_offset; | |
1772 | ||
1773 | ret = btrfs_comp_cpu_keys(key, &test); | |
1774 | if (ret > 0) | |
ac8e9819 CM |
1775 | return 0; |
1776 | return 1; | |
1777 | } | |
1778 | ||
1779 | static noinline int copy_to_sk(struct btrfs_root *root, | |
1780 | struct btrfs_path *path, | |
1781 | struct btrfs_key *key, | |
1782 | struct btrfs_ioctl_search_key *sk, | |
1783 | char *buf, | |
1784 | unsigned long *sk_offset, | |
1785 | int *num_found) | |
1786 | { | |
1787 | u64 found_transid; | |
1788 | struct extent_buffer *leaf; | |
1789 | struct btrfs_ioctl_search_header sh; | |
1790 | unsigned long item_off; | |
1791 | unsigned long item_len; | |
1792 | int nritems; | |
1793 | int i; | |
1794 | int slot; | |
ac8e9819 CM |
1795 | int ret = 0; |
1796 | ||
1797 | leaf = path->nodes[0]; | |
1798 | slot = path->slots[0]; | |
1799 | nritems = btrfs_header_nritems(leaf); | |
1800 | ||
1801 | if (btrfs_header_generation(leaf) > sk->max_transid) { | |
1802 | i = nritems; | |
1803 | goto advance_key; | |
1804 | } | |
1805 | found_transid = btrfs_header_generation(leaf); | |
1806 | ||
1807 | for (i = slot; i < nritems; i++) { | |
1808 | item_off = btrfs_item_ptr_offset(leaf, i); | |
1809 | item_len = btrfs_item_size_nr(leaf, i); | |
1810 | ||
03b71c6c GP |
1811 | btrfs_item_key_to_cpu(leaf, key, i); |
1812 | if (!key_in_sk(key, sk)) | |
1813 | continue; | |
1814 | ||
1815 | if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE) | |
ac8e9819 CM |
1816 | item_len = 0; |
1817 | ||
1818 | if (sizeof(sh) + item_len + *sk_offset > | |
1819 | BTRFS_SEARCH_ARGS_BUFSIZE) { | |
1820 | ret = 1; | |
1821 | goto overflow; | |
1822 | } | |
1823 | ||
ac8e9819 CM |
1824 | sh.objectid = key->objectid; |
1825 | sh.offset = key->offset; | |
1826 | sh.type = key->type; | |
1827 | sh.len = item_len; | |
1828 | sh.transid = found_transid; | |
1829 | ||
1830 | /* copy search result header */ | |
1831 | memcpy(buf + *sk_offset, &sh, sizeof(sh)); | |
1832 | *sk_offset += sizeof(sh); | |
1833 | ||
1834 | if (item_len) { | |
1835 | char *p = buf + *sk_offset; | |
1836 | /* copy the item */ | |
1837 | read_extent_buffer(leaf, p, | |
1838 | item_off, item_len); | |
1839 | *sk_offset += item_len; | |
ac8e9819 | 1840 | } |
e2156867 | 1841 | (*num_found)++; |
ac8e9819 CM |
1842 | |
1843 | if (*num_found >= sk->nr_items) | |
1844 | break; | |
1845 | } | |
1846 | advance_key: | |
abc6e134 CM |
1847 | ret = 0; |
1848 | if (key->offset < (u64)-1 && key->offset < sk->max_offset) | |
ac8e9819 | 1849 | key->offset++; |
abc6e134 CM |
1850 | else if (key->type < (u8)-1 && key->type < sk->max_type) { |
1851 | key->offset = 0; | |
ac8e9819 | 1852 | key->type++; |
abc6e134 CM |
1853 | } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { |
1854 | key->offset = 0; | |
1855 | key->type = 0; | |
ac8e9819 | 1856 | key->objectid++; |
abc6e134 CM |
1857 | } else |
1858 | ret = 1; | |
ac8e9819 | 1859 | overflow: |
ac8e9819 CM |
1860 | return ret; |
1861 | } | |
1862 | ||
1863 | static noinline int search_ioctl(struct inode *inode, | |
1864 | struct btrfs_ioctl_search_args *args) | |
1865 | { | |
1866 | struct btrfs_root *root; | |
1867 | struct btrfs_key key; | |
1868 | struct btrfs_key max_key; | |
1869 | struct btrfs_path *path; | |
1870 | struct btrfs_ioctl_search_key *sk = &args->key; | |
1871 | struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; | |
1872 | int ret; | |
1873 | int num_found = 0; | |
1874 | unsigned long sk_offset = 0; | |
1875 | ||
1876 | path = btrfs_alloc_path(); | |
1877 | if (!path) | |
1878 | return -ENOMEM; | |
1879 | ||
1880 | if (sk->tree_id == 0) { | |
1881 | /* search the root of the inode that was passed */ | |
1882 | root = BTRFS_I(inode)->root; | |
1883 | } else { | |
1884 | key.objectid = sk->tree_id; | |
1885 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1886 | key.offset = (u64)-1; | |
1887 | root = btrfs_read_fs_root_no_name(info, &key); | |
1888 | if (IS_ERR(root)) { | |
1889 | printk(KERN_ERR "could not find root %llu\n", | |
1890 | sk->tree_id); | |
1891 | btrfs_free_path(path); | |
1892 | return -ENOENT; | |
1893 | } | |
1894 | } | |
1895 | ||
1896 | key.objectid = sk->min_objectid; | |
1897 | key.type = sk->min_type; | |
1898 | key.offset = sk->min_offset; | |
1899 | ||
1900 | max_key.objectid = sk->max_objectid; | |
1901 | max_key.type = sk->max_type; | |
1902 | max_key.offset = sk->max_offset; | |
1903 | ||
1904 | path->keep_locks = 1; | |
1905 | ||
1906 | while(1) { | |
de78b51a | 1907 | ret = btrfs_search_forward(root, &key, &max_key, path, |
ac8e9819 CM |
1908 | sk->min_transid); |
1909 | if (ret != 0) { | |
1910 | if (ret > 0) | |
1911 | ret = 0; | |
1912 | goto err; | |
1913 | } | |
1914 | ret = copy_to_sk(root, path, &key, sk, args->buf, | |
1915 | &sk_offset, &num_found); | |
b3b4aa74 | 1916 | btrfs_release_path(path); |
ac8e9819 CM |
1917 | if (ret || num_found >= sk->nr_items) |
1918 | break; | |
1919 | ||
1920 | } | |
1921 | ret = 0; | |
1922 | err: | |
1923 | sk->nr_items = num_found; | |
1924 | btrfs_free_path(path); | |
1925 | return ret; | |
1926 | } | |
1927 | ||
1928 | static noinline int btrfs_ioctl_tree_search(struct file *file, | |
1929 | void __user *argp) | |
1930 | { | |
1931 | struct btrfs_ioctl_search_args *args; | |
1932 | struct inode *inode; | |
1933 | int ret; | |
1934 | ||
1935 | if (!capable(CAP_SYS_ADMIN)) | |
1936 | return -EPERM; | |
1937 | ||
2354d08f JL |
1938 | args = memdup_user(argp, sizeof(*args)); |
1939 | if (IS_ERR(args)) | |
1940 | return PTR_ERR(args); | |
ac8e9819 | 1941 | |
496ad9aa | 1942 | inode = file_inode(file); |
ac8e9819 CM |
1943 | ret = search_ioctl(inode, args); |
1944 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
1945 | ret = -EFAULT; | |
1946 | kfree(args); | |
1947 | return ret; | |
1948 | } | |
1949 | ||
98d377a0 | 1950 | /* |
ac8e9819 CM |
1951 | * Search INODE_REFs to identify path name of 'dirid' directory |
1952 | * in a 'tree_id' tree. and sets path name to 'name'. | |
1953 | */ | |
98d377a0 TH |
1954 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
1955 | u64 tree_id, u64 dirid, char *name) | |
1956 | { | |
1957 | struct btrfs_root *root; | |
1958 | struct btrfs_key key; | |
ac8e9819 | 1959 | char *ptr; |
98d377a0 TH |
1960 | int ret = -1; |
1961 | int slot; | |
1962 | int len; | |
1963 | int total_len = 0; | |
1964 | struct btrfs_inode_ref *iref; | |
1965 | struct extent_buffer *l; | |
1966 | struct btrfs_path *path; | |
1967 | ||
1968 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { | |
1969 | name[0]='\0'; | |
1970 | return 0; | |
1971 | } | |
1972 | ||
1973 | path = btrfs_alloc_path(); | |
1974 | if (!path) | |
1975 | return -ENOMEM; | |
1976 | ||
ac8e9819 | 1977 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; |
98d377a0 TH |
1978 | |
1979 | key.objectid = tree_id; | |
1980 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1981 | key.offset = (u64)-1; | |
1982 | root = btrfs_read_fs_root_no_name(info, &key); | |
1983 | if (IS_ERR(root)) { | |
1984 | printk(KERN_ERR "could not find root %llu\n", tree_id); | |
8ad6fcab CM |
1985 | ret = -ENOENT; |
1986 | goto out; | |
98d377a0 TH |
1987 | } |
1988 | ||
1989 | key.objectid = dirid; | |
1990 | key.type = BTRFS_INODE_REF_KEY; | |
8ad6fcab | 1991 | key.offset = (u64)-1; |
98d377a0 TH |
1992 | |
1993 | while(1) { | |
1994 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1995 | if (ret < 0) | |
1996 | goto out; | |
1997 | ||
1998 | l = path->nodes[0]; | |
1999 | slot = path->slots[0]; | |
8ad6fcab CM |
2000 | if (ret > 0 && slot > 0) |
2001 | slot--; | |
98d377a0 TH |
2002 | btrfs_item_key_to_cpu(l, &key, slot); |
2003 | ||
2004 | if (ret > 0 && (key.objectid != dirid || | |
ac8e9819 CM |
2005 | key.type != BTRFS_INODE_REF_KEY)) { |
2006 | ret = -ENOENT; | |
98d377a0 | 2007 | goto out; |
ac8e9819 | 2008 | } |
98d377a0 TH |
2009 | |
2010 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); | |
2011 | len = btrfs_inode_ref_name_len(l, iref); | |
2012 | ptr -= len + 1; | |
2013 | total_len += len + 1; | |
ac8e9819 | 2014 | if (ptr < name) |
98d377a0 TH |
2015 | goto out; |
2016 | ||
2017 | *(ptr + len) = '/'; | |
2018 | read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); | |
2019 | ||
2020 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) | |
2021 | break; | |
2022 | ||
b3b4aa74 | 2023 | btrfs_release_path(path); |
98d377a0 | 2024 | key.objectid = key.offset; |
8ad6fcab | 2025 | key.offset = (u64)-1; |
98d377a0 | 2026 | dirid = key.objectid; |
98d377a0 | 2027 | } |
ac8e9819 | 2028 | if (ptr < name) |
98d377a0 | 2029 | goto out; |
77906a50 | 2030 | memmove(name, ptr, total_len); |
98d377a0 TH |
2031 | name[total_len]='\0'; |
2032 | ret = 0; | |
2033 | out: | |
2034 | btrfs_free_path(path); | |
ac8e9819 CM |
2035 | return ret; |
2036 | } | |
2037 | ||
2038 | static noinline int btrfs_ioctl_ino_lookup(struct file *file, | |
2039 | void __user *argp) | |
2040 | { | |
2041 | struct btrfs_ioctl_ino_lookup_args *args; | |
2042 | struct inode *inode; | |
2043 | int ret; | |
2044 | ||
2045 | if (!capable(CAP_SYS_ADMIN)) | |
2046 | return -EPERM; | |
2047 | ||
2354d08f JL |
2048 | args = memdup_user(argp, sizeof(*args)); |
2049 | if (IS_ERR(args)) | |
2050 | return PTR_ERR(args); | |
c2b96929 | 2051 | |
496ad9aa | 2052 | inode = file_inode(file); |
ac8e9819 | 2053 | |
1b53ac4d CM |
2054 | if (args->treeid == 0) |
2055 | args->treeid = BTRFS_I(inode)->root->root_key.objectid; | |
2056 | ||
ac8e9819 CM |
2057 | ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, |
2058 | args->treeid, args->objectid, | |
2059 | args->name); | |
2060 | ||
2061 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
2062 | ret = -EFAULT; | |
2063 | ||
2064 | kfree(args); | |
98d377a0 TH |
2065 | return ret; |
2066 | } | |
2067 | ||
76dda93c YZ |
2068 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
2069 | void __user *arg) | |
2070 | { | |
2071 | struct dentry *parent = fdentry(file); | |
2072 | struct dentry *dentry; | |
2073 | struct inode *dir = parent->d_inode; | |
2074 | struct inode *inode; | |
2075 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2076 | struct btrfs_root *dest = NULL; | |
2077 | struct btrfs_ioctl_vol_args *vol_args; | |
2078 | struct btrfs_trans_handle *trans; | |
c58aaad2 MX |
2079 | struct btrfs_block_rsv block_rsv; |
2080 | u64 qgroup_reserved; | |
76dda93c YZ |
2081 | int namelen; |
2082 | int ret; | |
2083 | int err = 0; | |
2084 | ||
76dda93c YZ |
2085 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
2086 | if (IS_ERR(vol_args)) | |
2087 | return PTR_ERR(vol_args); | |
2088 | ||
2089 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
2090 | namelen = strlen(vol_args->name); | |
2091 | if (strchr(vol_args->name, '/') || | |
2092 | strncmp(vol_args->name, "..", namelen) == 0) { | |
2093 | err = -EINVAL; | |
2094 | goto out; | |
2095 | } | |
2096 | ||
a561be71 | 2097 | err = mnt_want_write_file(file); |
76dda93c YZ |
2098 | if (err) |
2099 | goto out; | |
2100 | ||
5c50c9b8 DS |
2101 | err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); |
2102 | if (err == -EINTR) | |
2103 | goto out; | |
76dda93c YZ |
2104 | dentry = lookup_one_len(vol_args->name, parent, namelen); |
2105 | if (IS_ERR(dentry)) { | |
2106 | err = PTR_ERR(dentry); | |
2107 | goto out_unlock_dir; | |
2108 | } | |
2109 | ||
2110 | if (!dentry->d_inode) { | |
2111 | err = -ENOENT; | |
2112 | goto out_dput; | |
2113 | } | |
2114 | ||
2115 | inode = dentry->d_inode; | |
4260f7c7 SW |
2116 | dest = BTRFS_I(inode)->root; |
2117 | if (!capable(CAP_SYS_ADMIN)){ | |
2118 | /* | |
2119 | * Regular user. Only allow this with a special mount | |
2120 | * option, when the user has write+exec access to the | |
2121 | * subvol root, and when rmdir(2) would have been | |
2122 | * allowed. | |
2123 | * | |
2124 | * Note that this is _not_ check that the subvol is | |
2125 | * empty or doesn't contain data that we wouldn't | |
2126 | * otherwise be able to delete. | |
2127 | * | |
2128 | * Users who want to delete empty subvols should try | |
2129 | * rmdir(2). | |
2130 | */ | |
2131 | err = -EPERM; | |
2132 | if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
2133 | goto out_dput; | |
2134 | ||
2135 | /* | |
2136 | * Do not allow deletion if the parent dir is the same | |
2137 | * as the dir to be deleted. That means the ioctl | |
2138 | * must be called on the dentry referencing the root | |
2139 | * of the subvol, not a random directory contained | |
2140 | * within it. | |
2141 | */ | |
2142 | err = -EINVAL; | |
2143 | if (root == dest) | |
2144 | goto out_dput; | |
2145 | ||
2146 | err = inode_permission(inode, MAY_WRITE | MAY_EXEC); | |
2147 | if (err) | |
2148 | goto out_dput; | |
4260f7c7 SW |
2149 | } |
2150 | ||
5c39da5b MX |
2151 | /* check if subvolume may be deleted by a user */ |
2152 | err = btrfs_may_delete(dir, dentry, 1); | |
2153 | if (err) | |
2154 | goto out_dput; | |
2155 | ||
33345d01 | 2156 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
76dda93c YZ |
2157 | err = -EINVAL; |
2158 | goto out_dput; | |
2159 | } | |
2160 | ||
76dda93c YZ |
2161 | mutex_lock(&inode->i_mutex); |
2162 | err = d_invalidate(dentry); | |
2163 | if (err) | |
2164 | goto out_unlock; | |
2165 | ||
2166 | down_write(&root->fs_info->subvol_sem); | |
2167 | ||
2168 | err = may_destroy_subvol(dest); | |
2169 | if (err) | |
2170 | goto out_up_write; | |
2171 | ||
c58aaad2 MX |
2172 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
2173 | /* | |
2174 | * One for dir inode, two for dir entries, two for root | |
2175 | * ref/backref. | |
2176 | */ | |
2177 | err = btrfs_subvolume_reserve_metadata(root, &block_rsv, | |
ee3441b4 | 2178 | 5, &qgroup_reserved, true); |
c58aaad2 MX |
2179 | if (err) |
2180 | goto out_up_write; | |
2181 | ||
a22285a6 YZ |
2182 | trans = btrfs_start_transaction(root, 0); |
2183 | if (IS_ERR(trans)) { | |
2184 | err = PTR_ERR(trans); | |
c58aaad2 | 2185 | goto out_release; |
a22285a6 | 2186 | } |
c58aaad2 MX |
2187 | trans->block_rsv = &block_rsv; |
2188 | trans->bytes_reserved = block_rsv.size; | |
a22285a6 | 2189 | |
76dda93c YZ |
2190 | ret = btrfs_unlink_subvol(trans, root, dir, |
2191 | dest->root_key.objectid, | |
2192 | dentry->d_name.name, | |
2193 | dentry->d_name.len); | |
79787eaa JM |
2194 | if (ret) { |
2195 | err = ret; | |
2196 | btrfs_abort_transaction(trans, root, ret); | |
2197 | goto out_end_trans; | |
2198 | } | |
76dda93c YZ |
2199 | |
2200 | btrfs_record_root_in_trans(trans, dest); | |
2201 | ||
2202 | memset(&dest->root_item.drop_progress, 0, | |
2203 | sizeof(dest->root_item.drop_progress)); | |
2204 | dest->root_item.drop_level = 0; | |
2205 | btrfs_set_root_refs(&dest->root_item, 0); | |
2206 | ||
d68fc57b YZ |
2207 | if (!xchg(&dest->orphan_item_inserted, 1)) { |
2208 | ret = btrfs_insert_orphan_item(trans, | |
2209 | root->fs_info->tree_root, | |
2210 | dest->root_key.objectid); | |
79787eaa JM |
2211 | if (ret) { |
2212 | btrfs_abort_transaction(trans, root, ret); | |
2213 | err = ret; | |
2214 | goto out_end_trans; | |
2215 | } | |
d68fc57b | 2216 | } |
79787eaa | 2217 | out_end_trans: |
c58aaad2 MX |
2218 | trans->block_rsv = NULL; |
2219 | trans->bytes_reserved = 0; | |
531cb13f | 2220 | ret = btrfs_end_transaction(trans, root); |
79787eaa JM |
2221 | if (ret && !err) |
2222 | err = ret; | |
76dda93c | 2223 | inode->i_flags |= S_DEAD; |
c58aaad2 MX |
2224 | out_release: |
2225 | btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); | |
76dda93c YZ |
2226 | out_up_write: |
2227 | up_write(&root->fs_info->subvol_sem); | |
2228 | out_unlock: | |
2229 | mutex_unlock(&inode->i_mutex); | |
2230 | if (!err) { | |
efefb143 | 2231 | shrink_dcache_sb(root->fs_info->sb); |
76dda93c YZ |
2232 | btrfs_invalidate_inodes(dest); |
2233 | d_delete(dentry); | |
fa6ac876 LB |
2234 | |
2235 | /* the last ref */ | |
2236 | if (dest->cache_inode) { | |
2237 | iput(dest->cache_inode); | |
2238 | dest->cache_inode = NULL; | |
2239 | } | |
76dda93c YZ |
2240 | } |
2241 | out_dput: | |
2242 | dput(dentry); | |
2243 | out_unlock_dir: | |
2244 | mutex_unlock(&dir->i_mutex); | |
2a79f17e | 2245 | mnt_drop_write_file(file); |
76dda93c YZ |
2246 | out: |
2247 | kfree(vol_args); | |
2248 | return err; | |
2249 | } | |
2250 | ||
1e701a32 | 2251 | static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
f46b5a66 | 2252 | { |
496ad9aa | 2253 | struct inode *inode = file_inode(file); |
f46b5a66 | 2254 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1e701a32 | 2255 | struct btrfs_ioctl_defrag_range_args *range; |
c146afad YZ |
2256 | int ret; |
2257 | ||
25122d15 ID |
2258 | ret = mnt_want_write_file(file); |
2259 | if (ret) | |
2260 | return ret; | |
b83cc969 | 2261 | |
25122d15 ID |
2262 | if (btrfs_root_readonly(root)) { |
2263 | ret = -EROFS; | |
2264 | goto out; | |
5ac00add | 2265 | } |
f46b5a66 CH |
2266 | |
2267 | switch (inode->i_mode & S_IFMT) { | |
2268 | case S_IFDIR: | |
e441d54d CM |
2269 | if (!capable(CAP_SYS_ADMIN)) { |
2270 | ret = -EPERM; | |
2271 | goto out; | |
2272 | } | |
de78b51a | 2273 | ret = btrfs_defrag_root(root); |
8929ecfa YZ |
2274 | if (ret) |
2275 | goto out; | |
de78b51a | 2276 | ret = btrfs_defrag_root(root->fs_info->extent_root); |
f46b5a66 CH |
2277 | break; |
2278 | case S_IFREG: | |
e441d54d CM |
2279 | if (!(file->f_mode & FMODE_WRITE)) { |
2280 | ret = -EINVAL; | |
2281 | goto out; | |
2282 | } | |
1e701a32 CM |
2283 | |
2284 | range = kzalloc(sizeof(*range), GFP_KERNEL); | |
2285 | if (!range) { | |
2286 | ret = -ENOMEM; | |
2287 | goto out; | |
2288 | } | |
2289 | ||
2290 | if (argp) { | |
2291 | if (copy_from_user(range, argp, | |
2292 | sizeof(*range))) { | |
2293 | ret = -EFAULT; | |
2294 | kfree(range); | |
683be16e | 2295 | goto out; |
1e701a32 CM |
2296 | } |
2297 | /* compression requires us to start the IO */ | |
2298 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
2299 | range->flags |= BTRFS_DEFRAG_RANGE_START_IO; | |
2300 | range->extent_thresh = (u32)-1; | |
2301 | } | |
2302 | } else { | |
2303 | /* the rest are all set to zero by kzalloc */ | |
2304 | range->len = (u64)-1; | |
2305 | } | |
496ad9aa | 2306 | ret = btrfs_defrag_file(file_inode(file), file, |
4cb5300b CM |
2307 | range, 0, 0); |
2308 | if (ret > 0) | |
2309 | ret = 0; | |
1e701a32 | 2310 | kfree(range); |
f46b5a66 | 2311 | break; |
8929ecfa YZ |
2312 | default: |
2313 | ret = -EINVAL; | |
f46b5a66 | 2314 | } |
e441d54d | 2315 | out: |
25122d15 | 2316 | mnt_drop_write_file(file); |
e441d54d | 2317 | return ret; |
f46b5a66 CH |
2318 | } |
2319 | ||
b2950863 | 2320 | static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
2321 | { |
2322 | struct btrfs_ioctl_vol_args *vol_args; | |
2323 | int ret; | |
2324 | ||
e441d54d CM |
2325 | if (!capable(CAP_SYS_ADMIN)) |
2326 | return -EPERM; | |
2327 | ||
5ac00add SB |
2328 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
2329 | 1)) { | |
2330 | pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); | |
2c0c9da0 | 2331 | return -EINVAL; |
c9e9f97b ID |
2332 | } |
2333 | ||
5ac00add | 2334 | mutex_lock(&root->fs_info->volume_mutex); |
dae7b665 | 2335 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2336 | if (IS_ERR(vol_args)) { |
2337 | ret = PTR_ERR(vol_args); | |
2338 | goto out; | |
2339 | } | |
f46b5a66 | 2340 | |
5516e595 | 2341 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
2342 | ret = btrfs_init_new_device(root, vol_args->name); |
2343 | ||
f46b5a66 | 2344 | kfree(vol_args); |
c9e9f97b ID |
2345 | out: |
2346 | mutex_unlock(&root->fs_info->volume_mutex); | |
5ac00add | 2347 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
f46b5a66 CH |
2348 | return ret; |
2349 | } | |
2350 | ||
da24927b | 2351 | static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) |
f46b5a66 | 2352 | { |
496ad9aa | 2353 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
f46b5a66 CH |
2354 | struct btrfs_ioctl_vol_args *vol_args; |
2355 | int ret; | |
2356 | ||
e441d54d CM |
2357 | if (!capable(CAP_SYS_ADMIN)) |
2358 | return -EPERM; | |
2359 | ||
da24927b MX |
2360 | ret = mnt_want_write_file(file); |
2361 | if (ret) | |
2362 | return ret; | |
c146afad | 2363 | |
dae7b665 | 2364 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2365 | if (IS_ERR(vol_args)) { |
2366 | ret = PTR_ERR(vol_args); | |
2367 | goto out; | |
2368 | } | |
f46b5a66 | 2369 | |
5516e595 | 2370 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 | 2371 | |
183860f6 AJ |
2372 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
2373 | 1)) { | |
2374 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; | |
2375 | goto out; | |
2376 | } | |
2377 | ||
2378 | mutex_lock(&root->fs_info->volume_mutex); | |
2379 | ret = btrfs_rm_device(root, vol_args->name); | |
c9e9f97b | 2380 | mutex_unlock(&root->fs_info->volume_mutex); |
5ac00add | 2381 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
183860f6 AJ |
2382 | |
2383 | out: | |
2384 | kfree(vol_args); | |
4ac20c70 | 2385 | mnt_drop_write_file(file); |
f46b5a66 CH |
2386 | return ret; |
2387 | } | |
2388 | ||
475f6387 JS |
2389 | static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) |
2390 | { | |
027ed2f0 | 2391 | struct btrfs_ioctl_fs_info_args *fi_args; |
475f6387 JS |
2392 | struct btrfs_device *device; |
2393 | struct btrfs_device *next; | |
2394 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
027ed2f0 | 2395 | int ret = 0; |
475f6387 JS |
2396 | |
2397 | if (!capable(CAP_SYS_ADMIN)) | |
2398 | return -EPERM; | |
2399 | ||
027ed2f0 LZ |
2400 | fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); |
2401 | if (!fi_args) | |
2402 | return -ENOMEM; | |
2403 | ||
2404 | fi_args->num_devices = fs_devices->num_devices; | |
2405 | memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); | |
475f6387 JS |
2406 | |
2407 | mutex_lock(&fs_devices->device_list_mutex); | |
2408 | list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { | |
027ed2f0 LZ |
2409 | if (device->devid > fi_args->max_id) |
2410 | fi_args->max_id = device->devid; | |
475f6387 JS |
2411 | } |
2412 | mutex_unlock(&fs_devices->device_list_mutex); | |
2413 | ||
027ed2f0 LZ |
2414 | if (copy_to_user(arg, fi_args, sizeof(*fi_args))) |
2415 | ret = -EFAULT; | |
475f6387 | 2416 | |
027ed2f0 LZ |
2417 | kfree(fi_args); |
2418 | return ret; | |
475f6387 JS |
2419 | } |
2420 | ||
2421 | static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) | |
2422 | { | |
2423 | struct btrfs_ioctl_dev_info_args *di_args; | |
2424 | struct btrfs_device *dev; | |
2425 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
2426 | int ret = 0; | |
2427 | char *s_uuid = NULL; | |
2428 | char empty_uuid[BTRFS_UUID_SIZE] = {0}; | |
2429 | ||
2430 | if (!capable(CAP_SYS_ADMIN)) | |
2431 | return -EPERM; | |
2432 | ||
2433 | di_args = memdup_user(arg, sizeof(*di_args)); | |
2434 | if (IS_ERR(di_args)) | |
2435 | return PTR_ERR(di_args); | |
2436 | ||
2437 | if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0) | |
2438 | s_uuid = di_args->uuid; | |
2439 | ||
2440 | mutex_lock(&fs_devices->device_list_mutex); | |
aa1b8cd4 | 2441 | dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); |
475f6387 JS |
2442 | |
2443 | if (!dev) { | |
2444 | ret = -ENODEV; | |
2445 | goto out; | |
2446 | } | |
2447 | ||
2448 | di_args->devid = dev->devid; | |
2449 | di_args->bytes_used = dev->bytes_used; | |
2450 | di_args->total_bytes = dev->total_bytes; | |
2451 | memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); | |
a27202fb | 2452 | if (dev->name) { |
606686ee JB |
2453 | struct rcu_string *name; |
2454 | ||
2455 | rcu_read_lock(); | |
2456 | name = rcu_dereference(dev->name); | |
2457 | strncpy(di_args->path, name->str, sizeof(di_args->path)); | |
2458 | rcu_read_unlock(); | |
a27202fb JM |
2459 | di_args->path[sizeof(di_args->path) - 1] = 0; |
2460 | } else { | |
99ba55ad | 2461 | di_args->path[0] = '\0'; |
a27202fb | 2462 | } |
475f6387 JS |
2463 | |
2464 | out: | |
55793c0d | 2465 | mutex_unlock(&fs_devices->device_list_mutex); |
475f6387 JS |
2466 | if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) |
2467 | ret = -EFAULT; | |
2468 | ||
2469 | kfree(di_args); | |
2470 | return ret; | |
2471 | } | |
2472 | ||
76dda93c YZ |
2473 | static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, |
2474 | u64 off, u64 olen, u64 destoff) | |
f46b5a66 | 2475 | { |
496ad9aa | 2476 | struct inode *inode = file_inode(file); |
f46b5a66 | 2477 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2903ff01 | 2478 | struct fd src_file; |
f46b5a66 CH |
2479 | struct inode *src; |
2480 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 2481 | struct btrfs_path *path; |
f46b5a66 | 2482 | struct extent_buffer *leaf; |
ae01a0ab YZ |
2483 | char *buf; |
2484 | struct btrfs_key key; | |
f46b5a66 CH |
2485 | u32 nritems; |
2486 | int slot; | |
ae01a0ab | 2487 | int ret; |
c5c9cd4d SW |
2488 | u64 len = olen; |
2489 | u64 bs = root->fs_info->sb->s_blocksize; | |
a96fbc72 | 2490 | int same_inode = 0; |
d20f7043 | 2491 | |
c5c9cd4d SW |
2492 | /* |
2493 | * TODO: | |
2494 | * - split compressed inline extents. annoying: we need to | |
2495 | * decompress into destination's address_space (the file offset | |
2496 | * may change, so source mapping won't do), then recompress (or | |
2497 | * otherwise reinsert) a subrange. | |
2498 | * - allow ranges within the same file to be cloned (provided | |
2499 | * they don't overlap)? | |
2500 | */ | |
2501 | ||
e441d54d | 2502 | /* the destination must be opened for writing */ |
2ebc3464 | 2503 | if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) |
e441d54d CM |
2504 | return -EINVAL; |
2505 | ||
b83cc969 LZ |
2506 | if (btrfs_root_readonly(root)) |
2507 | return -EROFS; | |
2508 | ||
a561be71 | 2509 | ret = mnt_want_write_file(file); |
c146afad YZ |
2510 | if (ret) |
2511 | return ret; | |
2512 | ||
2903ff01 AV |
2513 | src_file = fdget(srcfd); |
2514 | if (!src_file.file) { | |
ab67b7c1 YZ |
2515 | ret = -EBADF; |
2516 | goto out_drop_write; | |
2517 | } | |
5dc64164 | 2518 | |
362a20c5 | 2519 | ret = -EXDEV; |
2903ff01 | 2520 | if (src_file.file->f_path.mnt != file->f_path.mnt) |
362a20c5 DS |
2521 | goto out_fput; |
2522 | ||
496ad9aa | 2523 | src = file_inode(src_file.file); |
f46b5a66 | 2524 | |
c5c9cd4d SW |
2525 | ret = -EINVAL; |
2526 | if (src == inode) | |
a96fbc72 | 2527 | same_inode = 1; |
c5c9cd4d | 2528 | |
5dc64164 | 2529 | /* the src must be open for reading */ |
2903ff01 | 2530 | if (!(src_file.file->f_mode & FMODE_READ)) |
5dc64164 DR |
2531 | goto out_fput; |
2532 | ||
0e7b824c LZ |
2533 | /* don't make the dst file partly checksummed */ |
2534 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != | |
2535 | (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) | |
2536 | goto out_fput; | |
2537 | ||
ae01a0ab YZ |
2538 | ret = -EISDIR; |
2539 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) | |
2540 | goto out_fput; | |
2541 | ||
f46b5a66 | 2542 | ret = -EXDEV; |
362a20c5 | 2543 | if (src->i_sb != inode->i_sb) |
ae01a0ab YZ |
2544 | goto out_fput; |
2545 | ||
2546 | ret = -ENOMEM; | |
2547 | buf = vmalloc(btrfs_level_size(root, 0)); | |
2548 | if (!buf) | |
2549 | goto out_fput; | |
2550 | ||
2551 | path = btrfs_alloc_path(); | |
2552 | if (!path) { | |
2553 | vfree(buf); | |
f46b5a66 | 2554 | goto out_fput; |
ae01a0ab YZ |
2555 | } |
2556 | path->reada = 2; | |
f46b5a66 | 2557 | |
a96fbc72 LB |
2558 | if (!same_inode) { |
2559 | if (inode < src) { | |
2560 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); | |
2561 | mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); | |
2562 | } else { | |
2563 | mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); | |
2564 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); | |
2565 | } | |
f46b5a66 | 2566 | } else { |
a96fbc72 | 2567 | mutex_lock(&src->i_mutex); |
f46b5a66 CH |
2568 | } |
2569 | ||
c5c9cd4d SW |
2570 | /* determine range to clone */ |
2571 | ret = -EINVAL; | |
2ebc3464 | 2572 | if (off + len > src->i_size || off + len < off) |
f46b5a66 | 2573 | goto out_unlock; |
c5c9cd4d SW |
2574 | if (len == 0) |
2575 | olen = len = src->i_size - off; | |
2576 | /* if we extend to eof, continue to block boundary */ | |
2577 | if (off + len == src->i_size) | |
2a6b8dae | 2578 | len = ALIGN(src->i_size, bs) - off; |
c5c9cd4d SW |
2579 | |
2580 | /* verify the end result is block aligned */ | |
2a6b8dae LZ |
2581 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || |
2582 | !IS_ALIGNED(destoff, bs)) | |
c5c9cd4d SW |
2583 | goto out_unlock; |
2584 | ||
a96fbc72 LB |
2585 | /* verify if ranges are overlapped within the same file */ |
2586 | if (same_inode) { | |
2587 | if (destoff + len > off && destoff < off + len) | |
2588 | goto out_unlock; | |
2589 | } | |
2590 | ||
d525e8ab LZ |
2591 | if (destoff > inode->i_size) { |
2592 | ret = btrfs_cont_expand(inode, inode->i_size, destoff); | |
2593 | if (ret) | |
2594 | goto out_unlock; | |
2595 | } | |
2596 | ||
71ef0786 LZ |
2597 | /* truncate page cache pages from target inode range */ |
2598 | truncate_inode_pages_range(&inode->i_data, destoff, | |
2599 | PAGE_CACHE_ALIGN(destoff + len) - 1); | |
2600 | ||
f46b5a66 CH |
2601 | /* do any pending delalloc/csum calc on src, one way or |
2602 | another, and lock file content */ | |
2603 | while (1) { | |
31840ae1 | 2604 | struct btrfs_ordered_extent *ordered; |
aa42ffd9 LB |
2605 | lock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); |
2606 | ordered = btrfs_lookup_first_ordered_extent(src, off + len - 1); | |
9a019196 | 2607 | if (!ordered && |
aa42ffd9 LB |
2608 | !test_range_bit(&BTRFS_I(src)->io_tree, off, off + len - 1, |
2609 | EXTENT_DELALLOC, 0, NULL)) | |
f46b5a66 | 2610 | break; |
aa42ffd9 | 2611 | unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); |
ae01a0ab YZ |
2612 | if (ordered) |
2613 | btrfs_put_ordered_extent(ordered); | |
9a019196 | 2614 | btrfs_wait_ordered_range(src, off, len); |
f46b5a66 CH |
2615 | } |
2616 | ||
c5c9cd4d | 2617 | /* clone data */ |
33345d01 | 2618 | key.objectid = btrfs_ino(src); |
ae01a0ab YZ |
2619 | key.type = BTRFS_EXTENT_DATA_KEY; |
2620 | key.offset = 0; | |
f46b5a66 CH |
2621 | |
2622 | while (1) { | |
2623 | /* | |
2624 | * note the key will change type as we walk through the | |
2625 | * tree. | |
2626 | */ | |
362a20c5 DS |
2627 | ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, |
2628 | 0, 0); | |
f46b5a66 CH |
2629 | if (ret < 0) |
2630 | goto out; | |
2631 | ||
ae01a0ab YZ |
2632 | nritems = btrfs_header_nritems(path->nodes[0]); |
2633 | if (path->slots[0] >= nritems) { | |
362a20c5 | 2634 | ret = btrfs_next_leaf(BTRFS_I(src)->root, path); |
f46b5a66 CH |
2635 | if (ret < 0) |
2636 | goto out; | |
2637 | if (ret > 0) | |
2638 | break; | |
ae01a0ab | 2639 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
2640 | } |
2641 | leaf = path->nodes[0]; | |
2642 | slot = path->slots[0]; | |
f46b5a66 | 2643 | |
ae01a0ab | 2644 | btrfs_item_key_to_cpu(leaf, &key, slot); |
d20f7043 | 2645 | if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || |
33345d01 | 2646 | key.objectid != btrfs_ino(src)) |
f46b5a66 CH |
2647 | break; |
2648 | ||
c5c9cd4d SW |
2649 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
2650 | struct btrfs_file_extent_item *extent; | |
2651 | int type; | |
31840ae1 ZY |
2652 | u32 size; |
2653 | struct btrfs_key new_key; | |
c5c9cd4d SW |
2654 | u64 disko = 0, diskl = 0; |
2655 | u64 datao = 0, datal = 0; | |
2656 | u8 comp; | |
b5384d48 | 2657 | u64 endoff; |
31840ae1 ZY |
2658 | |
2659 | size = btrfs_item_size_nr(leaf, slot); | |
2660 | read_extent_buffer(leaf, buf, | |
2661 | btrfs_item_ptr_offset(leaf, slot), | |
2662 | size); | |
c5c9cd4d SW |
2663 | |
2664 | extent = btrfs_item_ptr(leaf, slot, | |
2665 | struct btrfs_file_extent_item); | |
2666 | comp = btrfs_file_extent_compression(leaf, extent); | |
2667 | type = btrfs_file_extent_type(leaf, extent); | |
c8a894d7 CM |
2668 | if (type == BTRFS_FILE_EXTENT_REG || |
2669 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d397712b CM |
2670 | disko = btrfs_file_extent_disk_bytenr(leaf, |
2671 | extent); | |
2672 | diskl = btrfs_file_extent_disk_num_bytes(leaf, | |
2673 | extent); | |
c5c9cd4d | 2674 | datao = btrfs_file_extent_offset(leaf, extent); |
d397712b CM |
2675 | datal = btrfs_file_extent_num_bytes(leaf, |
2676 | extent); | |
c5c9cd4d SW |
2677 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
2678 | /* take upper bound, may be compressed */ | |
2679 | datal = btrfs_file_extent_ram_bytes(leaf, | |
2680 | extent); | |
2681 | } | |
b3b4aa74 | 2682 | btrfs_release_path(path); |
31840ae1 | 2683 | |
050006a7 | 2684 | if (key.offset + datal <= off || |
aa42ffd9 | 2685 | key.offset >= off + len - 1) |
c5c9cd4d SW |
2686 | goto next; |
2687 | ||
31840ae1 | 2688 | memcpy(&new_key, &key, sizeof(new_key)); |
33345d01 | 2689 | new_key.objectid = btrfs_ino(inode); |
4d728ec7 LZ |
2690 | if (off <= key.offset) |
2691 | new_key.offset = key.offset + destoff - off; | |
2692 | else | |
2693 | new_key.offset = destoff; | |
31840ae1 | 2694 | |
b6f3409b SW |
2695 | /* |
2696 | * 1 - adjusting old extent (we may have to split it) | |
2697 | * 1 - add new extent | |
2698 | * 1 - inode update | |
2699 | */ | |
2700 | trans = btrfs_start_transaction(root, 3); | |
a22285a6 YZ |
2701 | if (IS_ERR(trans)) { |
2702 | ret = PTR_ERR(trans); | |
2703 | goto out; | |
2704 | } | |
2705 | ||
c8a894d7 CM |
2706 | if (type == BTRFS_FILE_EXTENT_REG || |
2707 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d72c0842 LZ |
2708 | /* |
2709 | * a | --- range to clone ---| b | |
2710 | * | ------------- extent ------------- | | |
2711 | */ | |
2712 | ||
2713 | /* substract range b */ | |
2714 | if (key.offset + datal > off + len) | |
2715 | datal = off + len - key.offset; | |
2716 | ||
2717 | /* substract range a */ | |
a22285a6 YZ |
2718 | if (off > key.offset) { |
2719 | datao += off - key.offset; | |
2720 | datal -= off - key.offset; | |
2721 | } | |
2722 | ||
5dc562c5 | 2723 | ret = btrfs_drop_extents(trans, root, inode, |
a22285a6 YZ |
2724 | new_key.offset, |
2725 | new_key.offset + datal, | |
2671485d | 2726 | 1); |
79787eaa JM |
2727 | if (ret) { |
2728 | btrfs_abort_transaction(trans, root, | |
2729 | ret); | |
2730 | btrfs_end_transaction(trans, root); | |
2731 | goto out; | |
2732 | } | |
a22285a6 | 2733 | |
c5c9cd4d SW |
2734 | ret = btrfs_insert_empty_item(trans, root, path, |
2735 | &new_key, size); | |
79787eaa JM |
2736 | if (ret) { |
2737 | btrfs_abort_transaction(trans, root, | |
2738 | ret); | |
2739 | btrfs_end_transaction(trans, root); | |
2740 | goto out; | |
2741 | } | |
c5c9cd4d SW |
2742 | |
2743 | leaf = path->nodes[0]; | |
2744 | slot = path->slots[0]; | |
2745 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
2746 | btrfs_item_ptr_offset(leaf, slot), |
2747 | size); | |
ae01a0ab | 2748 | |
c5c9cd4d | 2749 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 2750 | struct btrfs_file_extent_item); |
c5c9cd4d | 2751 | |
c5c9cd4d SW |
2752 | /* disko == 0 means it's a hole */ |
2753 | if (!disko) | |
2754 | datao = 0; | |
c5c9cd4d SW |
2755 | |
2756 | btrfs_set_file_extent_offset(leaf, extent, | |
2757 | datao); | |
2758 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
2759 | datal); | |
2760 | if (disko) { | |
2761 | inode_add_bytes(inode, datal); | |
ae01a0ab | 2762 | ret = btrfs_inc_extent_ref(trans, root, |
5d4f98a2 YZ |
2763 | disko, diskl, 0, |
2764 | root->root_key.objectid, | |
33345d01 | 2765 | btrfs_ino(inode), |
66d7e7f0 AJ |
2766 | new_key.offset - datao, |
2767 | 0); | |
79787eaa JM |
2768 | if (ret) { |
2769 | btrfs_abort_transaction(trans, | |
2770 | root, | |
2771 | ret); | |
2772 | btrfs_end_transaction(trans, | |
2773 | root); | |
2774 | goto out; | |
2775 | ||
2776 | } | |
f46b5a66 | 2777 | } |
c5c9cd4d SW |
2778 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
2779 | u64 skip = 0; | |
2780 | u64 trim = 0; | |
2781 | if (off > key.offset) { | |
2782 | skip = off - key.offset; | |
2783 | new_key.offset += skip; | |
2784 | } | |
d397712b | 2785 | |
aa42ffd9 LB |
2786 | if (key.offset + datal > off + len) |
2787 | trim = key.offset + datal - (off + len); | |
d397712b | 2788 | |
c5c9cd4d | 2789 | if (comp && (skip || trim)) { |
c5c9cd4d | 2790 | ret = -EINVAL; |
a22285a6 | 2791 | btrfs_end_transaction(trans, root); |
c5c9cd4d SW |
2792 | goto out; |
2793 | } | |
2794 | size -= skip + trim; | |
2795 | datal -= skip + trim; | |
a22285a6 | 2796 | |
5dc562c5 | 2797 | ret = btrfs_drop_extents(trans, root, inode, |
a22285a6 YZ |
2798 | new_key.offset, |
2799 | new_key.offset + datal, | |
2671485d | 2800 | 1); |
79787eaa JM |
2801 | if (ret) { |
2802 | btrfs_abort_transaction(trans, root, | |
2803 | ret); | |
2804 | btrfs_end_transaction(trans, root); | |
2805 | goto out; | |
2806 | } | |
a22285a6 | 2807 | |
c5c9cd4d SW |
2808 | ret = btrfs_insert_empty_item(trans, root, path, |
2809 | &new_key, size); | |
79787eaa JM |
2810 | if (ret) { |
2811 | btrfs_abort_transaction(trans, root, | |
2812 | ret); | |
2813 | btrfs_end_transaction(trans, root); | |
2814 | goto out; | |
2815 | } | |
c5c9cd4d SW |
2816 | |
2817 | if (skip) { | |
d397712b CM |
2818 | u32 start = |
2819 | btrfs_file_extent_calc_inline_size(0); | |
c5c9cd4d SW |
2820 | memmove(buf+start, buf+start+skip, |
2821 | datal); | |
2822 | } | |
2823 | ||
2824 | leaf = path->nodes[0]; | |
2825 | slot = path->slots[0]; | |
2826 | write_extent_buffer(leaf, buf, | |
2827 | btrfs_item_ptr_offset(leaf, slot), | |
2828 | size); | |
2829 | inode_add_bytes(inode, datal); | |
f46b5a66 | 2830 | } |
c5c9cd4d SW |
2831 | |
2832 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 2833 | btrfs_release_path(path); |
c5c9cd4d | 2834 | |
0c4d2d95 | 2835 | inode_inc_iversion(inode); |
a22285a6 | 2836 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
b5384d48 SW |
2837 | |
2838 | /* | |
2839 | * we round up to the block size at eof when | |
2840 | * determining which extents to clone above, | |
2841 | * but shouldn't round up the file size | |
2842 | */ | |
2843 | endoff = new_key.offset + datal; | |
5f3888ff LZ |
2844 | if (endoff > destoff+olen) |
2845 | endoff = destoff+olen; | |
b5384d48 SW |
2846 | if (endoff > inode->i_size) |
2847 | btrfs_i_size_write(inode, endoff); | |
2848 | ||
a22285a6 | 2849 | ret = btrfs_update_inode(trans, root, inode); |
79787eaa JM |
2850 | if (ret) { |
2851 | btrfs_abort_transaction(trans, root, ret); | |
2852 | btrfs_end_transaction(trans, root); | |
2853 | goto out; | |
2854 | } | |
2855 | ret = btrfs_end_transaction(trans, root); | |
a22285a6 | 2856 | } |
d397712b | 2857 | next: |
b3b4aa74 | 2858 | btrfs_release_path(path); |
f46b5a66 | 2859 | key.offset++; |
f46b5a66 | 2860 | } |
f46b5a66 CH |
2861 | ret = 0; |
2862 | out: | |
b3b4aa74 | 2863 | btrfs_release_path(path); |
aa42ffd9 | 2864 | unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); |
f46b5a66 CH |
2865 | out_unlock: |
2866 | mutex_unlock(&src->i_mutex); | |
a96fbc72 LB |
2867 | if (!same_inode) |
2868 | mutex_unlock(&inode->i_mutex); | |
ae01a0ab YZ |
2869 | vfree(buf); |
2870 | btrfs_free_path(path); | |
f46b5a66 | 2871 | out_fput: |
2903ff01 | 2872 | fdput(src_file); |
ab67b7c1 | 2873 | out_drop_write: |
2a79f17e | 2874 | mnt_drop_write_file(file); |
f46b5a66 CH |
2875 | return ret; |
2876 | } | |
2877 | ||
7a865e8a | 2878 | static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) |
c5c9cd4d SW |
2879 | { |
2880 | struct btrfs_ioctl_clone_range_args args; | |
2881 | ||
7a865e8a | 2882 | if (copy_from_user(&args, argp, sizeof(args))) |
c5c9cd4d SW |
2883 | return -EFAULT; |
2884 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, | |
2885 | args.src_length, args.dest_offset); | |
2886 | } | |
2887 | ||
f46b5a66 CH |
2888 | /* |
2889 | * there are many ways the trans_start and trans_end ioctls can lead | |
2890 | * to deadlocks. They should only be used by applications that | |
2891 | * basically own the machine, and have a very in depth understanding | |
2892 | * of all the possible deadlocks and enospc problems. | |
2893 | */ | |
b2950863 | 2894 | static long btrfs_ioctl_trans_start(struct file *file) |
f46b5a66 | 2895 | { |
496ad9aa | 2896 | struct inode *inode = file_inode(file); |
f46b5a66 CH |
2897 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2898 | struct btrfs_trans_handle *trans; | |
1ab86aed | 2899 | int ret; |
f46b5a66 | 2900 | |
1ab86aed | 2901 | ret = -EPERM; |
df5b5520 | 2902 | if (!capable(CAP_SYS_ADMIN)) |
1ab86aed | 2903 | goto out; |
df5b5520 | 2904 | |
1ab86aed SW |
2905 | ret = -EINPROGRESS; |
2906 | if (file->private_data) | |
f46b5a66 | 2907 | goto out; |
9ca9ee09 | 2908 | |
b83cc969 LZ |
2909 | ret = -EROFS; |
2910 | if (btrfs_root_readonly(root)) | |
2911 | goto out; | |
2912 | ||
a561be71 | 2913 | ret = mnt_want_write_file(file); |
c146afad YZ |
2914 | if (ret) |
2915 | goto out; | |
2916 | ||
a4abeea4 | 2917 | atomic_inc(&root->fs_info->open_ioctl_trans); |
9ca9ee09 | 2918 | |
1ab86aed | 2919 | ret = -ENOMEM; |
7a7eaa40 | 2920 | trans = btrfs_start_ioctl_transaction(root); |
abd30bb0 | 2921 | if (IS_ERR(trans)) |
1ab86aed SW |
2922 | goto out_drop; |
2923 | ||
2924 | file->private_data = trans; | |
2925 | return 0; | |
2926 | ||
2927 | out_drop: | |
a4abeea4 | 2928 | atomic_dec(&root->fs_info->open_ioctl_trans); |
2a79f17e | 2929 | mnt_drop_write_file(file); |
f46b5a66 | 2930 | out: |
f46b5a66 CH |
2931 | return ret; |
2932 | } | |
2933 | ||
6ef5ed0d JB |
2934 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
2935 | { | |
496ad9aa | 2936 | struct inode *inode = file_inode(file); |
6ef5ed0d JB |
2937 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2938 | struct btrfs_root *new_root; | |
2939 | struct btrfs_dir_item *di; | |
2940 | struct btrfs_trans_handle *trans; | |
2941 | struct btrfs_path *path; | |
2942 | struct btrfs_key location; | |
2943 | struct btrfs_disk_key disk_key; | |
6ef5ed0d JB |
2944 | u64 objectid = 0; |
2945 | u64 dir_id; | |
3c04ce01 | 2946 | int ret; |
6ef5ed0d JB |
2947 | |
2948 | if (!capable(CAP_SYS_ADMIN)) | |
2949 | return -EPERM; | |
2950 | ||
3c04ce01 MX |
2951 | ret = mnt_want_write_file(file); |
2952 | if (ret) | |
2953 | return ret; | |
2954 | ||
2955 | if (copy_from_user(&objectid, argp, sizeof(objectid))) { | |
2956 | ret = -EFAULT; | |
2957 | goto out; | |
2958 | } | |
6ef5ed0d JB |
2959 | |
2960 | if (!objectid) | |
2961 | objectid = root->root_key.objectid; | |
2962 | ||
2963 | location.objectid = objectid; | |
2964 | location.type = BTRFS_ROOT_ITEM_KEY; | |
2965 | location.offset = (u64)-1; | |
2966 | ||
2967 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
3c04ce01 MX |
2968 | if (IS_ERR(new_root)) { |
2969 | ret = PTR_ERR(new_root); | |
2970 | goto out; | |
2971 | } | |
6ef5ed0d | 2972 | |
6ef5ed0d | 2973 | path = btrfs_alloc_path(); |
3c04ce01 MX |
2974 | if (!path) { |
2975 | ret = -ENOMEM; | |
2976 | goto out; | |
2977 | } | |
6ef5ed0d JB |
2978 | path->leave_spinning = 1; |
2979 | ||
2980 | trans = btrfs_start_transaction(root, 1); | |
98d5dc13 | 2981 | if (IS_ERR(trans)) { |
6ef5ed0d | 2982 | btrfs_free_path(path); |
3c04ce01 MX |
2983 | ret = PTR_ERR(trans); |
2984 | goto out; | |
6ef5ed0d JB |
2985 | } |
2986 | ||
6c41761f | 2987 | dir_id = btrfs_super_root_dir(root->fs_info->super_copy); |
6ef5ed0d JB |
2988 | di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, |
2989 | dir_id, "default", 7, 1); | |
cf1e99a4 | 2990 | if (IS_ERR_OR_NULL(di)) { |
6ef5ed0d JB |
2991 | btrfs_free_path(path); |
2992 | btrfs_end_transaction(trans, root); | |
2993 | printk(KERN_ERR "Umm, you don't have the default dir item, " | |
2994 | "this isn't going to work\n"); | |
3c04ce01 MX |
2995 | ret = -ENOENT; |
2996 | goto out; | |
6ef5ed0d JB |
2997 | } |
2998 | ||
2999 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); | |
3000 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); | |
3001 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
3002 | btrfs_free_path(path); | |
3003 | ||
2b0ce2c2 | 3004 | btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); |
6ef5ed0d | 3005 | btrfs_end_transaction(trans, root); |
3c04ce01 MX |
3006 | out: |
3007 | mnt_drop_write_file(file); | |
3008 | return ret; | |
6ef5ed0d JB |
3009 | } |
3010 | ||
5af3e8cc SB |
3011 | void btrfs_get_block_group_info(struct list_head *groups_list, |
3012 | struct btrfs_ioctl_space_info *space) | |
bf5fc093 JB |
3013 | { |
3014 | struct btrfs_block_group_cache *block_group; | |
3015 | ||
3016 | space->total_bytes = 0; | |
3017 | space->used_bytes = 0; | |
3018 | space->flags = 0; | |
3019 | list_for_each_entry(block_group, groups_list, list) { | |
3020 | space->flags = block_group->flags; | |
3021 | space->total_bytes += block_group->key.offset; | |
3022 | space->used_bytes += | |
3023 | btrfs_block_group_used(&block_group->item); | |
3024 | } | |
3025 | } | |
3026 | ||
48a3b636 | 3027 | static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) |
1406e432 JB |
3028 | { |
3029 | struct btrfs_ioctl_space_args space_args; | |
3030 | struct btrfs_ioctl_space_info space; | |
3031 | struct btrfs_ioctl_space_info *dest; | |
7fde62bf | 3032 | struct btrfs_ioctl_space_info *dest_orig; |
13f2696f | 3033 | struct btrfs_ioctl_space_info __user *user_dest; |
1406e432 | 3034 | struct btrfs_space_info *info; |
bf5fc093 JB |
3035 | u64 types[] = {BTRFS_BLOCK_GROUP_DATA, |
3036 | BTRFS_BLOCK_GROUP_SYSTEM, | |
3037 | BTRFS_BLOCK_GROUP_METADATA, | |
3038 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; | |
3039 | int num_types = 4; | |
7fde62bf | 3040 | int alloc_size; |
1406e432 | 3041 | int ret = 0; |
51788b1b | 3042 | u64 slot_count = 0; |
bf5fc093 | 3043 | int i, c; |
1406e432 JB |
3044 | |
3045 | if (copy_from_user(&space_args, | |
3046 | (struct btrfs_ioctl_space_args __user *)arg, | |
3047 | sizeof(space_args))) | |
3048 | return -EFAULT; | |
3049 | ||
bf5fc093 JB |
3050 | for (i = 0; i < num_types; i++) { |
3051 | struct btrfs_space_info *tmp; | |
3052 | ||
3053 | info = NULL; | |
3054 | rcu_read_lock(); | |
3055 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
3056 | list) { | |
3057 | if (tmp->flags == types[i]) { | |
3058 | info = tmp; | |
3059 | break; | |
3060 | } | |
3061 | } | |
3062 | rcu_read_unlock(); | |
3063 | ||
3064 | if (!info) | |
3065 | continue; | |
3066 | ||
3067 | down_read(&info->groups_sem); | |
3068 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
3069 | if (!list_empty(&info->block_groups[c])) | |
3070 | slot_count++; | |
3071 | } | |
3072 | up_read(&info->groups_sem); | |
3073 | } | |
7fde62bf CM |
3074 | |
3075 | /* space_slots == 0 means they are asking for a count */ | |
3076 | if (space_args.space_slots == 0) { | |
3077 | space_args.total_spaces = slot_count; | |
3078 | goto out; | |
3079 | } | |
bf5fc093 | 3080 | |
51788b1b | 3081 | slot_count = min_t(u64, space_args.space_slots, slot_count); |
bf5fc093 | 3082 | |
7fde62bf | 3083 | alloc_size = sizeof(*dest) * slot_count; |
bf5fc093 | 3084 | |
7fde62bf CM |
3085 | /* we generally have at most 6 or so space infos, one for each raid |
3086 | * level. So, a whole page should be more than enough for everyone | |
3087 | */ | |
3088 | if (alloc_size > PAGE_CACHE_SIZE) | |
3089 | return -ENOMEM; | |
3090 | ||
1406e432 | 3091 | space_args.total_spaces = 0; |
7fde62bf CM |
3092 | dest = kmalloc(alloc_size, GFP_NOFS); |
3093 | if (!dest) | |
3094 | return -ENOMEM; | |
3095 | dest_orig = dest; | |
1406e432 | 3096 | |
7fde62bf | 3097 | /* now we have a buffer to copy into */ |
bf5fc093 JB |
3098 | for (i = 0; i < num_types; i++) { |
3099 | struct btrfs_space_info *tmp; | |
3100 | ||
51788b1b DR |
3101 | if (!slot_count) |
3102 | break; | |
3103 | ||
bf5fc093 JB |
3104 | info = NULL; |
3105 | rcu_read_lock(); | |
3106 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
3107 | list) { | |
3108 | if (tmp->flags == types[i]) { | |
3109 | info = tmp; | |
3110 | break; | |
3111 | } | |
3112 | } | |
3113 | rcu_read_unlock(); | |
7fde62bf | 3114 | |
bf5fc093 JB |
3115 | if (!info) |
3116 | continue; | |
3117 | down_read(&info->groups_sem); | |
3118 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
3119 | if (!list_empty(&info->block_groups[c])) { | |
5af3e8cc SB |
3120 | btrfs_get_block_group_info( |
3121 | &info->block_groups[c], &space); | |
bf5fc093 JB |
3122 | memcpy(dest, &space, sizeof(space)); |
3123 | dest++; | |
3124 | space_args.total_spaces++; | |
51788b1b | 3125 | slot_count--; |
bf5fc093 | 3126 | } |
51788b1b DR |
3127 | if (!slot_count) |
3128 | break; | |
bf5fc093 JB |
3129 | } |
3130 | up_read(&info->groups_sem); | |
1406e432 | 3131 | } |
1406e432 | 3132 | |
2eec6c81 | 3133 | user_dest = (struct btrfs_ioctl_space_info __user *) |
7fde62bf CM |
3134 | (arg + sizeof(struct btrfs_ioctl_space_args)); |
3135 | ||
3136 | if (copy_to_user(user_dest, dest_orig, alloc_size)) | |
3137 | ret = -EFAULT; | |
3138 | ||
3139 | kfree(dest_orig); | |
3140 | out: | |
3141 | if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) | |
1406e432 JB |
3142 | ret = -EFAULT; |
3143 | ||
3144 | return ret; | |
3145 | } | |
3146 | ||
f46b5a66 CH |
3147 | /* |
3148 | * there are many ways the trans_start and trans_end ioctls can lead | |
3149 | * to deadlocks. They should only be used by applications that | |
3150 | * basically own the machine, and have a very in depth understanding | |
3151 | * of all the possible deadlocks and enospc problems. | |
3152 | */ | |
3153 | long btrfs_ioctl_trans_end(struct file *file) | |
3154 | { | |
496ad9aa | 3155 | struct inode *inode = file_inode(file); |
f46b5a66 CH |
3156 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3157 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 3158 | |
f46b5a66 | 3159 | trans = file->private_data; |
1ab86aed SW |
3160 | if (!trans) |
3161 | return -EINVAL; | |
b214107e | 3162 | file->private_data = NULL; |
9ca9ee09 | 3163 | |
1ab86aed SW |
3164 | btrfs_end_transaction(trans, root); |
3165 | ||
a4abeea4 | 3166 | atomic_dec(&root->fs_info->open_ioctl_trans); |
9ca9ee09 | 3167 | |
2a79f17e | 3168 | mnt_drop_write_file(file); |
1ab86aed | 3169 | return 0; |
f46b5a66 CH |
3170 | } |
3171 | ||
9a8c28be MX |
3172 | static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, |
3173 | void __user *argp) | |
46204592 | 3174 | { |
46204592 SW |
3175 | struct btrfs_trans_handle *trans; |
3176 | u64 transid; | |
db5b493a | 3177 | int ret; |
46204592 | 3178 | |
d4edf39b | 3179 | trans = btrfs_attach_transaction_barrier(root); |
ff7c1d33 MX |
3180 | if (IS_ERR(trans)) { |
3181 | if (PTR_ERR(trans) != -ENOENT) | |
3182 | return PTR_ERR(trans); | |
3183 | ||
3184 | /* No running transaction, don't bother */ | |
3185 | transid = root->fs_info->last_trans_committed; | |
3186 | goto out; | |
3187 | } | |
46204592 | 3188 | transid = trans->transid; |
db5b493a | 3189 | ret = btrfs_commit_transaction_async(trans, root, 0); |
8b2b2d3c TI |
3190 | if (ret) { |
3191 | btrfs_end_transaction(trans, root); | |
db5b493a | 3192 | return ret; |
8b2b2d3c | 3193 | } |
ff7c1d33 | 3194 | out: |
46204592 SW |
3195 | if (argp) |
3196 | if (copy_to_user(argp, &transid, sizeof(transid))) | |
3197 | return -EFAULT; | |
3198 | return 0; | |
3199 | } | |
3200 | ||
9a8c28be MX |
3201 | static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, |
3202 | void __user *argp) | |
46204592 | 3203 | { |
46204592 SW |
3204 | u64 transid; |
3205 | ||
3206 | if (argp) { | |
3207 | if (copy_from_user(&transid, argp, sizeof(transid))) | |
3208 | return -EFAULT; | |
3209 | } else { | |
3210 | transid = 0; /* current trans */ | |
3211 | } | |
3212 | return btrfs_wait_for_commit(root, transid); | |
3213 | } | |
3214 | ||
b8e95489 | 3215 | static long btrfs_ioctl_scrub(struct file *file, void __user *arg) |
475f6387 | 3216 | { |
496ad9aa | 3217 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
475f6387 | 3218 | struct btrfs_ioctl_scrub_args *sa; |
b8e95489 | 3219 | int ret; |
475f6387 JS |
3220 | |
3221 | if (!capable(CAP_SYS_ADMIN)) | |
3222 | return -EPERM; | |
3223 | ||
3224 | sa = memdup_user(arg, sizeof(*sa)); | |
3225 | if (IS_ERR(sa)) | |
3226 | return PTR_ERR(sa); | |
3227 | ||
b8e95489 MX |
3228 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) { |
3229 | ret = mnt_want_write_file(file); | |
3230 | if (ret) | |
3231 | goto out; | |
3232 | } | |
3233 | ||
aa1b8cd4 | 3234 | ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, |
63a212ab SB |
3235 | &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, |
3236 | 0); | |
475f6387 JS |
3237 | |
3238 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
3239 | ret = -EFAULT; | |
3240 | ||
b8e95489 MX |
3241 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) |
3242 | mnt_drop_write_file(file); | |
3243 | out: | |
475f6387 JS |
3244 | kfree(sa); |
3245 | return ret; | |
3246 | } | |
3247 | ||
3248 | static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) | |
3249 | { | |
3250 | if (!capable(CAP_SYS_ADMIN)) | |
3251 | return -EPERM; | |
3252 | ||
aa1b8cd4 | 3253 | return btrfs_scrub_cancel(root->fs_info); |
475f6387 JS |
3254 | } |
3255 | ||
3256 | static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, | |
3257 | void __user *arg) | |
3258 | { | |
3259 | struct btrfs_ioctl_scrub_args *sa; | |
3260 | int ret; | |
3261 | ||
3262 | if (!capable(CAP_SYS_ADMIN)) | |
3263 | return -EPERM; | |
3264 | ||
3265 | sa = memdup_user(arg, sizeof(*sa)); | |
3266 | if (IS_ERR(sa)) | |
3267 | return PTR_ERR(sa); | |
3268 | ||
3269 | ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); | |
3270 | ||
3271 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
3272 | ret = -EFAULT; | |
3273 | ||
3274 | kfree(sa); | |
3275 | return ret; | |
3276 | } | |
3277 | ||
c11d2c23 | 3278 | static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, |
b27f7c0c | 3279 | void __user *arg) |
c11d2c23 SB |
3280 | { |
3281 | struct btrfs_ioctl_get_dev_stats *sa; | |
3282 | int ret; | |
3283 | ||
c11d2c23 SB |
3284 | sa = memdup_user(arg, sizeof(*sa)); |
3285 | if (IS_ERR(sa)) | |
3286 | return PTR_ERR(sa); | |
3287 | ||
b27f7c0c DS |
3288 | if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { |
3289 | kfree(sa); | |
3290 | return -EPERM; | |
3291 | } | |
3292 | ||
3293 | ret = btrfs_get_dev_stats(root, sa); | |
c11d2c23 SB |
3294 | |
3295 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
3296 | ret = -EFAULT; | |
3297 | ||
3298 | kfree(sa); | |
3299 | return ret; | |
3300 | } | |
3301 | ||
3f6bcfbd SB |
3302 | static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) |
3303 | { | |
3304 | struct btrfs_ioctl_dev_replace_args *p; | |
3305 | int ret; | |
3306 | ||
3307 | if (!capable(CAP_SYS_ADMIN)) | |
3308 | return -EPERM; | |
3309 | ||
3310 | p = memdup_user(arg, sizeof(*p)); | |
3311 | if (IS_ERR(p)) | |
3312 | return PTR_ERR(p); | |
3313 | ||
3314 | switch (p->cmd) { | |
3315 | case BTRFS_IOCTL_DEV_REPLACE_CMD_START: | |
3316 | if (atomic_xchg( | |
3317 | &root->fs_info->mutually_exclusive_operation_running, | |
3318 | 1)) { | |
3319 | pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); | |
3320 | ret = -EINPROGRESS; | |
3321 | } else { | |
3322 | ret = btrfs_dev_replace_start(root, p); | |
3323 | atomic_set( | |
3324 | &root->fs_info->mutually_exclusive_operation_running, | |
3325 | 0); | |
3326 | } | |
3327 | break; | |
3328 | case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: | |
3329 | btrfs_dev_replace_status(root->fs_info, p); | |
3330 | ret = 0; | |
3331 | break; | |
3332 | case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: | |
3333 | ret = btrfs_dev_replace_cancel(root->fs_info, p); | |
3334 | break; | |
3335 | default: | |
3336 | ret = -EINVAL; | |
3337 | break; | |
3338 | } | |
3339 | ||
3340 | if (copy_to_user(arg, p, sizeof(*p))) | |
3341 | ret = -EFAULT; | |
3342 | ||
3343 | kfree(p); | |
3344 | return ret; | |
3345 | } | |
3346 | ||
d7728c96 JS |
3347 | static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) |
3348 | { | |
3349 | int ret = 0; | |
3350 | int i; | |
740c3d22 | 3351 | u64 rel_ptr; |
d7728c96 | 3352 | int size; |
806468f8 | 3353 | struct btrfs_ioctl_ino_path_args *ipa = NULL; |
d7728c96 JS |
3354 | struct inode_fs_paths *ipath = NULL; |
3355 | struct btrfs_path *path; | |
3356 | ||
82b22ac8 | 3357 | if (!capable(CAP_DAC_READ_SEARCH)) |
d7728c96 JS |
3358 | return -EPERM; |
3359 | ||
3360 | path = btrfs_alloc_path(); | |
3361 | if (!path) { | |
3362 | ret = -ENOMEM; | |
3363 | goto out; | |
3364 | } | |
3365 | ||
3366 | ipa = memdup_user(arg, sizeof(*ipa)); | |
3367 | if (IS_ERR(ipa)) { | |
3368 | ret = PTR_ERR(ipa); | |
3369 | ipa = NULL; | |
3370 | goto out; | |
3371 | } | |
3372 | ||
3373 | size = min_t(u32, ipa->size, 4096); | |
3374 | ipath = init_ipath(size, root, path); | |
3375 | if (IS_ERR(ipath)) { | |
3376 | ret = PTR_ERR(ipath); | |
3377 | ipath = NULL; | |
3378 | goto out; | |
3379 | } | |
3380 | ||
3381 | ret = paths_from_inode(ipa->inum, ipath); | |
3382 | if (ret < 0) | |
3383 | goto out; | |
3384 | ||
3385 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) { | |
745c4d8e JM |
3386 | rel_ptr = ipath->fspath->val[i] - |
3387 | (u64)(unsigned long)ipath->fspath->val; | |
740c3d22 | 3388 | ipath->fspath->val[i] = rel_ptr; |
d7728c96 JS |
3389 | } |
3390 | ||
745c4d8e JM |
3391 | ret = copy_to_user((void *)(unsigned long)ipa->fspath, |
3392 | (void *)(unsigned long)ipath->fspath, size); | |
d7728c96 JS |
3393 | if (ret) { |
3394 | ret = -EFAULT; | |
3395 | goto out; | |
3396 | } | |
3397 | ||
3398 | out: | |
3399 | btrfs_free_path(path); | |
3400 | free_ipath(ipath); | |
3401 | kfree(ipa); | |
3402 | ||
3403 | return ret; | |
3404 | } | |
3405 | ||
3406 | static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) | |
3407 | { | |
3408 | struct btrfs_data_container *inodes = ctx; | |
3409 | const size_t c = 3 * sizeof(u64); | |
3410 | ||
3411 | if (inodes->bytes_left >= c) { | |
3412 | inodes->bytes_left -= c; | |
3413 | inodes->val[inodes->elem_cnt] = inum; | |
3414 | inodes->val[inodes->elem_cnt + 1] = offset; | |
3415 | inodes->val[inodes->elem_cnt + 2] = root; | |
3416 | inodes->elem_cnt += 3; | |
3417 | } else { | |
3418 | inodes->bytes_missing += c - inodes->bytes_left; | |
3419 | inodes->bytes_left = 0; | |
3420 | inodes->elem_missed += 3; | |
3421 | } | |
3422 | ||
3423 | return 0; | |
3424 | } | |
3425 | ||
3426 | static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, | |
3427 | void __user *arg) | |
3428 | { | |
3429 | int ret = 0; | |
3430 | int size; | |
d7728c96 JS |
3431 | struct btrfs_ioctl_logical_ino_args *loi; |
3432 | struct btrfs_data_container *inodes = NULL; | |
3433 | struct btrfs_path *path = NULL; | |
d7728c96 JS |
3434 | |
3435 | if (!capable(CAP_SYS_ADMIN)) | |
3436 | return -EPERM; | |
3437 | ||
3438 | loi = memdup_user(arg, sizeof(*loi)); | |
3439 | if (IS_ERR(loi)) { | |
3440 | ret = PTR_ERR(loi); | |
3441 | loi = NULL; | |
3442 | goto out; | |
3443 | } | |
3444 | ||
3445 | path = btrfs_alloc_path(); | |
3446 | if (!path) { | |
3447 | ret = -ENOMEM; | |
3448 | goto out; | |
3449 | } | |
3450 | ||
425d17a2 | 3451 | size = min_t(u32, loi->size, 64 * 1024); |
d7728c96 JS |
3452 | inodes = init_data_container(size); |
3453 | if (IS_ERR(inodes)) { | |
3454 | ret = PTR_ERR(inodes); | |
3455 | inodes = NULL; | |
3456 | goto out; | |
3457 | } | |
3458 | ||
df031f07 LB |
3459 | ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, |
3460 | build_ino_list, inodes); | |
3461 | if (ret == -EINVAL) | |
d7728c96 JS |
3462 | ret = -ENOENT; |
3463 | if (ret < 0) | |
3464 | goto out; | |
3465 | ||
745c4d8e JM |
3466 | ret = copy_to_user((void *)(unsigned long)loi->inodes, |
3467 | (void *)(unsigned long)inodes, size); | |
d7728c96 JS |
3468 | if (ret) |
3469 | ret = -EFAULT; | |
3470 | ||
3471 | out: | |
3472 | btrfs_free_path(path); | |
425d17a2 | 3473 | vfree(inodes); |
d7728c96 JS |
3474 | kfree(loi); |
3475 | ||
3476 | return ret; | |
3477 | } | |
3478 | ||
19a39dce | 3479 | void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, |
c9e9f97b ID |
3480 | struct btrfs_ioctl_balance_args *bargs) |
3481 | { | |
3482 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
3483 | ||
3484 | bargs->flags = bctl->flags; | |
3485 | ||
837d5b6e ID |
3486 | if (atomic_read(&fs_info->balance_running)) |
3487 | bargs->state |= BTRFS_BALANCE_STATE_RUNNING; | |
3488 | if (atomic_read(&fs_info->balance_pause_req)) | |
3489 | bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; | |
a7e99c69 ID |
3490 | if (atomic_read(&fs_info->balance_cancel_req)) |
3491 | bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; | |
837d5b6e | 3492 | |
c9e9f97b ID |
3493 | memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); |
3494 | memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); | |
3495 | memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); | |
19a39dce ID |
3496 | |
3497 | if (lock) { | |
3498 | spin_lock(&fs_info->balance_lock); | |
3499 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
3500 | spin_unlock(&fs_info->balance_lock); | |
3501 | } else { | |
3502 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
3503 | } | |
c9e9f97b ID |
3504 | } |
3505 | ||
9ba1f6e4 | 3506 | static long btrfs_ioctl_balance(struct file *file, void __user *arg) |
c9e9f97b | 3507 | { |
496ad9aa | 3508 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
c9e9f97b ID |
3509 | struct btrfs_fs_info *fs_info = root->fs_info; |
3510 | struct btrfs_ioctl_balance_args *bargs; | |
3511 | struct btrfs_balance_control *bctl; | |
ed0fb78f | 3512 | bool need_unlock; /* for mut. excl. ops lock */ |
c9e9f97b ID |
3513 | int ret; |
3514 | ||
3515 | if (!capable(CAP_SYS_ADMIN)) | |
3516 | return -EPERM; | |
3517 | ||
e54bfa31 | 3518 | ret = mnt_want_write_file(file); |
9ba1f6e4 LB |
3519 | if (ret) |
3520 | return ret; | |
3521 | ||
ed0fb78f ID |
3522 | again: |
3523 | if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { | |
3524 | mutex_lock(&fs_info->volume_mutex); | |
3525 | mutex_lock(&fs_info->balance_mutex); | |
3526 | need_unlock = true; | |
3527 | goto locked; | |
3528 | } | |
3529 | ||
3530 | /* | |
3531 | * mut. excl. ops lock is locked. Three possibilites: | |
3532 | * (1) some other op is running | |
3533 | * (2) balance is running | |
3534 | * (3) balance is paused -- special case (think resume) | |
3535 | */ | |
c9e9f97b | 3536 | mutex_lock(&fs_info->balance_mutex); |
ed0fb78f ID |
3537 | if (fs_info->balance_ctl) { |
3538 | /* this is either (2) or (3) */ | |
3539 | if (!atomic_read(&fs_info->balance_running)) { | |
3540 | mutex_unlock(&fs_info->balance_mutex); | |
3541 | if (!mutex_trylock(&fs_info->volume_mutex)) | |
3542 | goto again; | |
3543 | mutex_lock(&fs_info->balance_mutex); | |
3544 | ||
3545 | if (fs_info->balance_ctl && | |
3546 | !atomic_read(&fs_info->balance_running)) { | |
3547 | /* this is (3) */ | |
3548 | need_unlock = false; | |
3549 | goto locked; | |
3550 | } | |
3551 | ||
3552 | mutex_unlock(&fs_info->balance_mutex); | |
3553 | mutex_unlock(&fs_info->volume_mutex); | |
3554 | goto again; | |
3555 | } else { | |
3556 | /* this is (2) */ | |
3557 | mutex_unlock(&fs_info->balance_mutex); | |
3558 | ret = -EINPROGRESS; | |
3559 | goto out; | |
3560 | } | |
3561 | } else { | |
3562 | /* this is (1) */ | |
3563 | mutex_unlock(&fs_info->balance_mutex); | |
3564 | pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); | |
3565 | ret = -EINVAL; | |
3566 | goto out; | |
3567 | } | |
3568 | ||
3569 | locked: | |
3570 | BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); | |
c9e9f97b ID |
3571 | |
3572 | if (arg) { | |
3573 | bargs = memdup_user(arg, sizeof(*bargs)); | |
3574 | if (IS_ERR(bargs)) { | |
3575 | ret = PTR_ERR(bargs); | |
ed0fb78f | 3576 | goto out_unlock; |
c9e9f97b | 3577 | } |
de322263 ID |
3578 | |
3579 | if (bargs->flags & BTRFS_BALANCE_RESUME) { | |
3580 | if (!fs_info->balance_ctl) { | |
3581 | ret = -ENOTCONN; | |
3582 | goto out_bargs; | |
3583 | } | |
3584 | ||
3585 | bctl = fs_info->balance_ctl; | |
3586 | spin_lock(&fs_info->balance_lock); | |
3587 | bctl->flags |= BTRFS_BALANCE_RESUME; | |
3588 | spin_unlock(&fs_info->balance_lock); | |
3589 | ||
3590 | goto do_balance; | |
3591 | } | |
c9e9f97b ID |
3592 | } else { |
3593 | bargs = NULL; | |
3594 | } | |
3595 | ||
ed0fb78f | 3596 | if (fs_info->balance_ctl) { |
837d5b6e ID |
3597 | ret = -EINPROGRESS; |
3598 | goto out_bargs; | |
3599 | } | |
3600 | ||
c9e9f97b ID |
3601 | bctl = kzalloc(sizeof(*bctl), GFP_NOFS); |
3602 | if (!bctl) { | |
3603 | ret = -ENOMEM; | |
3604 | goto out_bargs; | |
3605 | } | |
3606 | ||
3607 | bctl->fs_info = fs_info; | |
3608 | if (arg) { | |
3609 | memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); | |
3610 | memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); | |
3611 | memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); | |
3612 | ||
3613 | bctl->flags = bargs->flags; | |
f43ffb60 ID |
3614 | } else { |
3615 | /* balance everything - no filters */ | |
3616 | bctl->flags |= BTRFS_BALANCE_TYPE_MASK; | |
c9e9f97b ID |
3617 | } |
3618 | ||
de322263 | 3619 | do_balance: |
c9e9f97b | 3620 | /* |
ed0fb78f ID |
3621 | * Ownership of bctl and mutually_exclusive_operation_running |
3622 | * goes to to btrfs_balance. bctl is freed in __cancel_balance, | |
3623 | * or, if restriper was paused all the way until unmount, in | |
3624 | * free_fs_info. mutually_exclusive_operation_running is | |
3625 | * cleared in __cancel_balance. | |
c9e9f97b | 3626 | */ |
ed0fb78f ID |
3627 | need_unlock = false; |
3628 | ||
3629 | ret = btrfs_balance(bctl, bargs); | |
3630 | ||
c9e9f97b ID |
3631 | if (arg) { |
3632 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
3633 | ret = -EFAULT; | |
3634 | } | |
3635 | ||
3636 | out_bargs: | |
3637 | kfree(bargs); | |
ed0fb78f | 3638 | out_unlock: |
c9e9f97b ID |
3639 | mutex_unlock(&fs_info->balance_mutex); |
3640 | mutex_unlock(&fs_info->volume_mutex); | |
ed0fb78f ID |
3641 | if (need_unlock) |
3642 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); | |
3643 | out: | |
e54bfa31 | 3644 | mnt_drop_write_file(file); |
c9e9f97b ID |
3645 | return ret; |
3646 | } | |
3647 | ||
837d5b6e ID |
3648 | static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) |
3649 | { | |
3650 | if (!capable(CAP_SYS_ADMIN)) | |
3651 | return -EPERM; | |
3652 | ||
3653 | switch (cmd) { | |
3654 | case BTRFS_BALANCE_CTL_PAUSE: | |
3655 | return btrfs_pause_balance(root->fs_info); | |
a7e99c69 ID |
3656 | case BTRFS_BALANCE_CTL_CANCEL: |
3657 | return btrfs_cancel_balance(root->fs_info); | |
837d5b6e ID |
3658 | } |
3659 | ||
3660 | return -EINVAL; | |
3661 | } | |
3662 | ||
19a39dce ID |
3663 | static long btrfs_ioctl_balance_progress(struct btrfs_root *root, |
3664 | void __user *arg) | |
3665 | { | |
3666 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3667 | struct btrfs_ioctl_balance_args *bargs; | |
3668 | int ret = 0; | |
3669 | ||
3670 | if (!capable(CAP_SYS_ADMIN)) | |
3671 | return -EPERM; | |
3672 | ||
3673 | mutex_lock(&fs_info->balance_mutex); | |
3674 | if (!fs_info->balance_ctl) { | |
3675 | ret = -ENOTCONN; | |
3676 | goto out; | |
3677 | } | |
3678 | ||
3679 | bargs = kzalloc(sizeof(*bargs), GFP_NOFS); | |
3680 | if (!bargs) { | |
3681 | ret = -ENOMEM; | |
3682 | goto out; | |
3683 | } | |
3684 | ||
3685 | update_ioctl_balance_args(fs_info, 1, bargs); | |
3686 | ||
3687 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
3688 | ret = -EFAULT; | |
3689 | ||
3690 | kfree(bargs); | |
3691 | out: | |
3692 | mutex_unlock(&fs_info->balance_mutex); | |
3693 | return ret; | |
3694 | } | |
3695 | ||
905b0dda | 3696 | static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) |
5d13a37b | 3697 | { |
496ad9aa | 3698 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
3699 | struct btrfs_ioctl_quota_ctl_args *sa; |
3700 | struct btrfs_trans_handle *trans = NULL; | |
3701 | int ret; | |
3702 | int err; | |
3703 | ||
3704 | if (!capable(CAP_SYS_ADMIN)) | |
3705 | return -EPERM; | |
3706 | ||
905b0dda MX |
3707 | ret = mnt_want_write_file(file); |
3708 | if (ret) | |
3709 | return ret; | |
5d13a37b AJ |
3710 | |
3711 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
3712 | if (IS_ERR(sa)) { |
3713 | ret = PTR_ERR(sa); | |
3714 | goto drop_write; | |
3715 | } | |
5d13a37b | 3716 | |
7708f029 | 3717 | down_write(&root->fs_info->subvol_sem); |
2f232036 JS |
3718 | trans = btrfs_start_transaction(root->fs_info->tree_root, 2); |
3719 | if (IS_ERR(trans)) { | |
3720 | ret = PTR_ERR(trans); | |
3721 | goto out; | |
5d13a37b AJ |
3722 | } |
3723 | ||
3724 | switch (sa->cmd) { | |
3725 | case BTRFS_QUOTA_CTL_ENABLE: | |
3726 | ret = btrfs_quota_enable(trans, root->fs_info); | |
3727 | break; | |
3728 | case BTRFS_QUOTA_CTL_DISABLE: | |
3729 | ret = btrfs_quota_disable(trans, root->fs_info); | |
3730 | break; | |
5d13a37b AJ |
3731 | default: |
3732 | ret = -EINVAL; | |
3733 | break; | |
3734 | } | |
3735 | ||
2f232036 JS |
3736 | err = btrfs_commit_transaction(trans, root->fs_info->tree_root); |
3737 | if (err && !ret) | |
3738 | ret = err; | |
5d13a37b AJ |
3739 | out: |
3740 | kfree(sa); | |
7708f029 | 3741 | up_write(&root->fs_info->subvol_sem); |
905b0dda MX |
3742 | drop_write: |
3743 | mnt_drop_write_file(file); | |
5d13a37b AJ |
3744 | return ret; |
3745 | } | |
3746 | ||
905b0dda | 3747 | static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) |
5d13a37b | 3748 | { |
496ad9aa | 3749 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
3750 | struct btrfs_ioctl_qgroup_assign_args *sa; |
3751 | struct btrfs_trans_handle *trans; | |
3752 | int ret; | |
3753 | int err; | |
3754 | ||
3755 | if (!capable(CAP_SYS_ADMIN)) | |
3756 | return -EPERM; | |
3757 | ||
905b0dda MX |
3758 | ret = mnt_want_write_file(file); |
3759 | if (ret) | |
3760 | return ret; | |
5d13a37b AJ |
3761 | |
3762 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
3763 | if (IS_ERR(sa)) { |
3764 | ret = PTR_ERR(sa); | |
3765 | goto drop_write; | |
3766 | } | |
5d13a37b AJ |
3767 | |
3768 | trans = btrfs_join_transaction(root); | |
3769 | if (IS_ERR(trans)) { | |
3770 | ret = PTR_ERR(trans); | |
3771 | goto out; | |
3772 | } | |
3773 | ||
3774 | /* FIXME: check if the IDs really exist */ | |
3775 | if (sa->assign) { | |
3776 | ret = btrfs_add_qgroup_relation(trans, root->fs_info, | |
3777 | sa->src, sa->dst); | |
3778 | } else { | |
3779 | ret = btrfs_del_qgroup_relation(trans, root->fs_info, | |
3780 | sa->src, sa->dst); | |
3781 | } | |
3782 | ||
3783 | err = btrfs_end_transaction(trans, root); | |
3784 | if (err && !ret) | |
3785 | ret = err; | |
3786 | ||
3787 | out: | |
3788 | kfree(sa); | |
905b0dda MX |
3789 | drop_write: |
3790 | mnt_drop_write_file(file); | |
5d13a37b AJ |
3791 | return ret; |
3792 | } | |
3793 | ||
905b0dda | 3794 | static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) |
5d13a37b | 3795 | { |
496ad9aa | 3796 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
3797 | struct btrfs_ioctl_qgroup_create_args *sa; |
3798 | struct btrfs_trans_handle *trans; | |
3799 | int ret; | |
3800 | int err; | |
3801 | ||
3802 | if (!capable(CAP_SYS_ADMIN)) | |
3803 | return -EPERM; | |
3804 | ||
905b0dda MX |
3805 | ret = mnt_want_write_file(file); |
3806 | if (ret) | |
3807 | return ret; | |
5d13a37b AJ |
3808 | |
3809 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
3810 | if (IS_ERR(sa)) { |
3811 | ret = PTR_ERR(sa); | |
3812 | goto drop_write; | |
3813 | } | |
5d13a37b | 3814 | |
d86e56cf MX |
3815 | if (!sa->qgroupid) { |
3816 | ret = -EINVAL; | |
3817 | goto out; | |
3818 | } | |
3819 | ||
5d13a37b AJ |
3820 | trans = btrfs_join_transaction(root); |
3821 | if (IS_ERR(trans)) { | |
3822 | ret = PTR_ERR(trans); | |
3823 | goto out; | |
3824 | } | |
3825 | ||
3826 | /* FIXME: check if the IDs really exist */ | |
3827 | if (sa->create) { | |
3828 | ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, | |
3829 | NULL); | |
3830 | } else { | |
3831 | ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); | |
3832 | } | |
3833 | ||
3834 | err = btrfs_end_transaction(trans, root); | |
3835 | if (err && !ret) | |
3836 | ret = err; | |
3837 | ||
3838 | out: | |
3839 | kfree(sa); | |
905b0dda MX |
3840 | drop_write: |
3841 | mnt_drop_write_file(file); | |
5d13a37b AJ |
3842 | return ret; |
3843 | } | |
3844 | ||
905b0dda | 3845 | static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) |
5d13a37b | 3846 | { |
496ad9aa | 3847 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
3848 | struct btrfs_ioctl_qgroup_limit_args *sa; |
3849 | struct btrfs_trans_handle *trans; | |
3850 | int ret; | |
3851 | int err; | |
3852 | u64 qgroupid; | |
3853 | ||
3854 | if (!capable(CAP_SYS_ADMIN)) | |
3855 | return -EPERM; | |
3856 | ||
905b0dda MX |
3857 | ret = mnt_want_write_file(file); |
3858 | if (ret) | |
3859 | return ret; | |
5d13a37b AJ |
3860 | |
3861 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
3862 | if (IS_ERR(sa)) { |
3863 | ret = PTR_ERR(sa); | |
3864 | goto drop_write; | |
3865 | } | |
5d13a37b AJ |
3866 | |
3867 | trans = btrfs_join_transaction(root); | |
3868 | if (IS_ERR(trans)) { | |
3869 | ret = PTR_ERR(trans); | |
3870 | goto out; | |
3871 | } | |
3872 | ||
3873 | qgroupid = sa->qgroupid; | |
3874 | if (!qgroupid) { | |
3875 | /* take the current subvol as qgroup */ | |
3876 | qgroupid = root->root_key.objectid; | |
3877 | } | |
3878 | ||
3879 | /* FIXME: check if the IDs really exist */ | |
3880 | ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); | |
3881 | ||
3882 | err = btrfs_end_transaction(trans, root); | |
3883 | if (err && !ret) | |
3884 | ret = err; | |
3885 | ||
3886 | out: | |
3887 | kfree(sa); | |
905b0dda MX |
3888 | drop_write: |
3889 | mnt_drop_write_file(file); | |
5d13a37b AJ |
3890 | return ret; |
3891 | } | |
3892 | ||
2f232036 JS |
3893 | static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) |
3894 | { | |
6d0379ec | 3895 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
2f232036 JS |
3896 | struct btrfs_ioctl_quota_rescan_args *qsa; |
3897 | int ret; | |
3898 | ||
3899 | if (!capable(CAP_SYS_ADMIN)) | |
3900 | return -EPERM; | |
3901 | ||
3902 | ret = mnt_want_write_file(file); | |
3903 | if (ret) | |
3904 | return ret; | |
3905 | ||
3906 | qsa = memdup_user(arg, sizeof(*qsa)); | |
3907 | if (IS_ERR(qsa)) { | |
3908 | ret = PTR_ERR(qsa); | |
3909 | goto drop_write; | |
3910 | } | |
3911 | ||
3912 | if (qsa->flags) { | |
3913 | ret = -EINVAL; | |
3914 | goto out; | |
3915 | } | |
3916 | ||
3917 | ret = btrfs_qgroup_rescan(root->fs_info); | |
3918 | ||
3919 | out: | |
3920 | kfree(qsa); | |
3921 | drop_write: | |
3922 | mnt_drop_write_file(file); | |
3923 | return ret; | |
3924 | } | |
3925 | ||
3926 | static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) | |
3927 | { | |
6d0379ec | 3928 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
2f232036 JS |
3929 | struct btrfs_ioctl_quota_rescan_args *qsa; |
3930 | int ret = 0; | |
3931 | ||
3932 | if (!capable(CAP_SYS_ADMIN)) | |
3933 | return -EPERM; | |
3934 | ||
3935 | qsa = kzalloc(sizeof(*qsa), GFP_NOFS); | |
3936 | if (!qsa) | |
3937 | return -ENOMEM; | |
3938 | ||
3939 | if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { | |
3940 | qsa->flags = 1; | |
3941 | qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; | |
3942 | } | |
3943 | ||
3944 | if (copy_to_user(arg, qsa, sizeof(*qsa))) | |
3945 | ret = -EFAULT; | |
3946 | ||
3947 | kfree(qsa); | |
3948 | return ret; | |
3949 | } | |
3950 | ||
57254b6e JS |
3951 | static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) |
3952 | { | |
3953 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; | |
3954 | ||
3955 | if (!capable(CAP_SYS_ADMIN)) | |
3956 | return -EPERM; | |
3957 | ||
3958 | return btrfs_qgroup_wait_for_completion(root->fs_info); | |
3959 | } | |
3960 | ||
8ea05e3a AB |
3961 | static long btrfs_ioctl_set_received_subvol(struct file *file, |
3962 | void __user *arg) | |
3963 | { | |
3964 | struct btrfs_ioctl_received_subvol_args *sa = NULL; | |
496ad9aa | 3965 | struct inode *inode = file_inode(file); |
8ea05e3a AB |
3966 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3967 | struct btrfs_root_item *root_item = &root->root_item; | |
3968 | struct btrfs_trans_handle *trans; | |
3969 | struct timespec ct = CURRENT_TIME; | |
3970 | int ret = 0; | |
3971 | ||
3972 | ret = mnt_want_write_file(file); | |
3973 | if (ret < 0) | |
3974 | return ret; | |
3975 | ||
3976 | down_write(&root->fs_info->subvol_sem); | |
3977 | ||
3978 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { | |
3979 | ret = -EINVAL; | |
3980 | goto out; | |
3981 | } | |
3982 | ||
3983 | if (btrfs_root_readonly(root)) { | |
3984 | ret = -EROFS; | |
3985 | goto out; | |
3986 | } | |
3987 | ||
3988 | if (!inode_owner_or_capable(inode)) { | |
3989 | ret = -EACCES; | |
3990 | goto out; | |
3991 | } | |
3992 | ||
3993 | sa = memdup_user(arg, sizeof(*sa)); | |
3994 | if (IS_ERR(sa)) { | |
3995 | ret = PTR_ERR(sa); | |
3996 | sa = NULL; | |
3997 | goto out; | |
3998 | } | |
3999 | ||
4000 | trans = btrfs_start_transaction(root, 1); | |
4001 | if (IS_ERR(trans)) { | |
4002 | ret = PTR_ERR(trans); | |
4003 | trans = NULL; | |
4004 | goto out; | |
4005 | } | |
4006 | ||
4007 | sa->rtransid = trans->transid; | |
4008 | sa->rtime.sec = ct.tv_sec; | |
4009 | sa->rtime.nsec = ct.tv_nsec; | |
4010 | ||
4011 | memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); | |
4012 | btrfs_set_root_stransid(root_item, sa->stransid); | |
4013 | btrfs_set_root_rtransid(root_item, sa->rtransid); | |
4014 | root_item->stime.sec = cpu_to_le64(sa->stime.sec); | |
4015 | root_item->stime.nsec = cpu_to_le32(sa->stime.nsec); | |
4016 | root_item->rtime.sec = cpu_to_le64(sa->rtime.sec); | |
4017 | root_item->rtime.nsec = cpu_to_le32(sa->rtime.nsec); | |
4018 | ||
4019 | ret = btrfs_update_root(trans, root->fs_info->tree_root, | |
4020 | &root->root_key, &root->root_item); | |
4021 | if (ret < 0) { | |
4022 | btrfs_end_transaction(trans, root); | |
4023 | trans = NULL; | |
4024 | goto out; | |
4025 | } else { | |
4026 | ret = btrfs_commit_transaction(trans, root); | |
4027 | if (ret < 0) | |
4028 | goto out; | |
4029 | } | |
4030 | ||
4031 | ret = copy_to_user(arg, sa, sizeof(*sa)); | |
4032 | if (ret) | |
4033 | ret = -EFAULT; | |
4034 | ||
4035 | out: | |
4036 | kfree(sa); | |
4037 | up_write(&root->fs_info->subvol_sem); | |
4038 | mnt_drop_write_file(file); | |
4039 | return ret; | |
4040 | } | |
4041 | ||
867ab667 | 4042 | static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) |
4043 | { | |
6d0379ec | 4044 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
867ab667 | 4045 | const char *label = root->fs_info->super_copy->label; |
4046 | size_t len = strnlen(label, BTRFS_LABEL_SIZE); | |
4047 | int ret; | |
4048 | ||
4049 | if (len == BTRFS_LABEL_SIZE) { | |
4050 | pr_warn("btrfs: label is too long, return the first %zu bytes\n", | |
4051 | --len); | |
4052 | } | |
4053 | ||
4054 | mutex_lock(&root->fs_info->volume_mutex); | |
4055 | ret = copy_to_user(arg, label, len); | |
4056 | mutex_unlock(&root->fs_info->volume_mutex); | |
4057 | ||
4058 | return ret ? -EFAULT : 0; | |
4059 | } | |
4060 | ||
a8bfd4ab | 4061 | static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) |
4062 | { | |
6d0379ec | 4063 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
a8bfd4ab | 4064 | struct btrfs_super_block *super_block = root->fs_info->super_copy; |
4065 | struct btrfs_trans_handle *trans; | |
4066 | char label[BTRFS_LABEL_SIZE]; | |
4067 | int ret; | |
4068 | ||
4069 | if (!capable(CAP_SYS_ADMIN)) | |
4070 | return -EPERM; | |
4071 | ||
4072 | if (copy_from_user(label, arg, sizeof(label))) | |
4073 | return -EFAULT; | |
4074 | ||
4075 | if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { | |
4076 | pr_err("btrfs: unable to set label with more than %d bytes\n", | |
4077 | BTRFS_LABEL_SIZE - 1); | |
4078 | return -EINVAL; | |
4079 | } | |
4080 | ||
4081 | ret = mnt_want_write_file(file); | |
4082 | if (ret) | |
4083 | return ret; | |
4084 | ||
4085 | mutex_lock(&root->fs_info->volume_mutex); | |
4086 | trans = btrfs_start_transaction(root, 0); | |
4087 | if (IS_ERR(trans)) { | |
4088 | ret = PTR_ERR(trans); | |
4089 | goto out_unlock; | |
4090 | } | |
4091 | ||
4092 | strcpy(super_block->label, label); | |
4093 | ret = btrfs_end_transaction(trans, root); | |
4094 | ||
4095 | out_unlock: | |
4096 | mutex_unlock(&root->fs_info->volume_mutex); | |
4097 | mnt_drop_write_file(file); | |
4098 | return ret; | |
4099 | } | |
4100 | ||
f46b5a66 CH |
4101 | long btrfs_ioctl(struct file *file, unsigned int |
4102 | cmd, unsigned long arg) | |
4103 | { | |
496ad9aa | 4104 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
4bcabaa3 | 4105 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
4106 | |
4107 | switch (cmd) { | |
6cbff00f CH |
4108 | case FS_IOC_GETFLAGS: |
4109 | return btrfs_ioctl_getflags(file, argp); | |
4110 | case FS_IOC_SETFLAGS: | |
4111 | return btrfs_ioctl_setflags(file, argp); | |
4112 | case FS_IOC_GETVERSION: | |
4113 | return btrfs_ioctl_getversion(file, argp); | |
f7039b1d LD |
4114 | case FITRIM: |
4115 | return btrfs_ioctl_fitrim(file, argp); | |
f46b5a66 | 4116 | case BTRFS_IOC_SNAP_CREATE: |
fa0d2b9b | 4117 | return btrfs_ioctl_snap_create(file, argp, 0); |
fdfb1e4f | 4118 | case BTRFS_IOC_SNAP_CREATE_V2: |
fa0d2b9b | 4119 | return btrfs_ioctl_snap_create_v2(file, argp, 0); |
3de4586c | 4120 | case BTRFS_IOC_SUBVOL_CREATE: |
fa0d2b9b | 4121 | return btrfs_ioctl_snap_create(file, argp, 1); |
6f72c7e2 AJ |
4122 | case BTRFS_IOC_SUBVOL_CREATE_V2: |
4123 | return btrfs_ioctl_snap_create_v2(file, argp, 1); | |
76dda93c YZ |
4124 | case BTRFS_IOC_SNAP_DESTROY: |
4125 | return btrfs_ioctl_snap_destroy(file, argp); | |
0caa102d LZ |
4126 | case BTRFS_IOC_SUBVOL_GETFLAGS: |
4127 | return btrfs_ioctl_subvol_getflags(file, argp); | |
4128 | case BTRFS_IOC_SUBVOL_SETFLAGS: | |
4129 | return btrfs_ioctl_subvol_setflags(file, argp); | |
6ef5ed0d JB |
4130 | case BTRFS_IOC_DEFAULT_SUBVOL: |
4131 | return btrfs_ioctl_default_subvol(file, argp); | |
f46b5a66 | 4132 | case BTRFS_IOC_DEFRAG: |
1e701a32 CM |
4133 | return btrfs_ioctl_defrag(file, NULL); |
4134 | case BTRFS_IOC_DEFRAG_RANGE: | |
4135 | return btrfs_ioctl_defrag(file, argp); | |
f46b5a66 | 4136 | case BTRFS_IOC_RESIZE: |
198605a8 | 4137 | return btrfs_ioctl_resize(file, argp); |
f46b5a66 | 4138 | case BTRFS_IOC_ADD_DEV: |
4bcabaa3 | 4139 | return btrfs_ioctl_add_dev(root, argp); |
f46b5a66 | 4140 | case BTRFS_IOC_RM_DEV: |
da24927b | 4141 | return btrfs_ioctl_rm_dev(file, argp); |
475f6387 JS |
4142 | case BTRFS_IOC_FS_INFO: |
4143 | return btrfs_ioctl_fs_info(root, argp); | |
4144 | case BTRFS_IOC_DEV_INFO: | |
4145 | return btrfs_ioctl_dev_info(root, argp); | |
f46b5a66 | 4146 | case BTRFS_IOC_BALANCE: |
9ba1f6e4 | 4147 | return btrfs_ioctl_balance(file, NULL); |
f46b5a66 | 4148 | case BTRFS_IOC_CLONE: |
c5c9cd4d SW |
4149 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
4150 | case BTRFS_IOC_CLONE_RANGE: | |
7a865e8a | 4151 | return btrfs_ioctl_clone_range(file, argp); |
f46b5a66 CH |
4152 | case BTRFS_IOC_TRANS_START: |
4153 | return btrfs_ioctl_trans_start(file); | |
4154 | case BTRFS_IOC_TRANS_END: | |
4155 | return btrfs_ioctl_trans_end(file); | |
ac8e9819 CM |
4156 | case BTRFS_IOC_TREE_SEARCH: |
4157 | return btrfs_ioctl_tree_search(file, argp); | |
4158 | case BTRFS_IOC_INO_LOOKUP: | |
4159 | return btrfs_ioctl_ino_lookup(file, argp); | |
d7728c96 JS |
4160 | case BTRFS_IOC_INO_PATHS: |
4161 | return btrfs_ioctl_ino_to_path(root, argp); | |
4162 | case BTRFS_IOC_LOGICAL_INO: | |
4163 | return btrfs_ioctl_logical_to_ino(root, argp); | |
1406e432 JB |
4164 | case BTRFS_IOC_SPACE_INFO: |
4165 | return btrfs_ioctl_space_info(root, argp); | |
f46b5a66 CH |
4166 | case BTRFS_IOC_SYNC: |
4167 | btrfs_sync_fs(file->f_dentry->d_sb, 1); | |
4168 | return 0; | |
46204592 | 4169 | case BTRFS_IOC_START_SYNC: |
9a8c28be | 4170 | return btrfs_ioctl_start_sync(root, argp); |
46204592 | 4171 | case BTRFS_IOC_WAIT_SYNC: |
9a8c28be | 4172 | return btrfs_ioctl_wait_sync(root, argp); |
475f6387 | 4173 | case BTRFS_IOC_SCRUB: |
b8e95489 | 4174 | return btrfs_ioctl_scrub(file, argp); |
475f6387 JS |
4175 | case BTRFS_IOC_SCRUB_CANCEL: |
4176 | return btrfs_ioctl_scrub_cancel(root, argp); | |
4177 | case BTRFS_IOC_SCRUB_PROGRESS: | |
4178 | return btrfs_ioctl_scrub_progress(root, argp); | |
c9e9f97b | 4179 | case BTRFS_IOC_BALANCE_V2: |
9ba1f6e4 | 4180 | return btrfs_ioctl_balance(file, argp); |
837d5b6e ID |
4181 | case BTRFS_IOC_BALANCE_CTL: |
4182 | return btrfs_ioctl_balance_ctl(root, arg); | |
19a39dce ID |
4183 | case BTRFS_IOC_BALANCE_PROGRESS: |
4184 | return btrfs_ioctl_balance_progress(root, argp); | |
8ea05e3a AB |
4185 | case BTRFS_IOC_SET_RECEIVED_SUBVOL: |
4186 | return btrfs_ioctl_set_received_subvol(file, argp); | |
31db9f7c AB |
4187 | case BTRFS_IOC_SEND: |
4188 | return btrfs_ioctl_send(file, argp); | |
c11d2c23 | 4189 | case BTRFS_IOC_GET_DEV_STATS: |
b27f7c0c | 4190 | return btrfs_ioctl_get_dev_stats(root, argp); |
5d13a37b | 4191 | case BTRFS_IOC_QUOTA_CTL: |
905b0dda | 4192 | return btrfs_ioctl_quota_ctl(file, argp); |
5d13a37b | 4193 | case BTRFS_IOC_QGROUP_ASSIGN: |
905b0dda | 4194 | return btrfs_ioctl_qgroup_assign(file, argp); |
5d13a37b | 4195 | case BTRFS_IOC_QGROUP_CREATE: |
905b0dda | 4196 | return btrfs_ioctl_qgroup_create(file, argp); |
5d13a37b | 4197 | case BTRFS_IOC_QGROUP_LIMIT: |
905b0dda | 4198 | return btrfs_ioctl_qgroup_limit(file, argp); |
2f232036 JS |
4199 | case BTRFS_IOC_QUOTA_RESCAN: |
4200 | return btrfs_ioctl_quota_rescan(file, argp); | |
4201 | case BTRFS_IOC_QUOTA_RESCAN_STATUS: | |
4202 | return btrfs_ioctl_quota_rescan_status(file, argp); | |
57254b6e JS |
4203 | case BTRFS_IOC_QUOTA_RESCAN_WAIT: |
4204 | return btrfs_ioctl_quota_rescan_wait(file, argp); | |
3f6bcfbd SB |
4205 | case BTRFS_IOC_DEV_REPLACE: |
4206 | return btrfs_ioctl_dev_replace(root, argp); | |
867ab667 | 4207 | case BTRFS_IOC_GET_FSLABEL: |
4208 | return btrfs_ioctl_get_fslabel(file, argp); | |
a8bfd4ab | 4209 | case BTRFS_IOC_SET_FSLABEL: |
4210 | return btrfs_ioctl_set_fslabel(file, argp); | |
f46b5a66 CH |
4211 | } |
4212 | ||
4213 | return -ENOTTY; | |
4214 | } |