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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> |
4b4e25f2 | 45 | #include "compat.h" |
f46b5a66 CH |
46 | #include "ctree.h" |
47 | #include "disk-io.h" | |
48 | #include "transaction.h" | |
49 | #include "btrfs_inode.h" | |
50 | #include "ioctl.h" | |
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" |
f46b5a66 | 58 | |
6cbff00f CH |
59 | /* Mask out flags that are inappropriate for the given type of inode. */ |
60 | static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) | |
61 | { | |
62 | if (S_ISDIR(mode)) | |
63 | return flags; | |
64 | else if (S_ISREG(mode)) | |
65 | return flags & ~FS_DIRSYNC_FL; | |
66 | else | |
67 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); | |
68 | } | |
69 | ||
70 | /* | |
71 | * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. | |
72 | */ | |
73 | static unsigned int btrfs_flags_to_ioctl(unsigned int flags) | |
74 | { | |
75 | unsigned int iflags = 0; | |
76 | ||
77 | if (flags & BTRFS_INODE_SYNC) | |
78 | iflags |= FS_SYNC_FL; | |
79 | if (flags & BTRFS_INODE_IMMUTABLE) | |
80 | iflags |= FS_IMMUTABLE_FL; | |
81 | if (flags & BTRFS_INODE_APPEND) | |
82 | iflags |= FS_APPEND_FL; | |
83 | if (flags & BTRFS_INODE_NODUMP) | |
84 | iflags |= FS_NODUMP_FL; | |
85 | if (flags & BTRFS_INODE_NOATIME) | |
86 | iflags |= FS_NOATIME_FL; | |
87 | if (flags & BTRFS_INODE_DIRSYNC) | |
88 | iflags |= FS_DIRSYNC_FL; | |
d0092bdd LZ |
89 | if (flags & BTRFS_INODE_NODATACOW) |
90 | iflags |= FS_NOCOW_FL; | |
91 | ||
92 | if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) | |
93 | iflags |= FS_COMPR_FL; | |
94 | else if (flags & BTRFS_INODE_NOCOMPRESS) | |
95 | iflags |= FS_NOCOMP_FL; | |
6cbff00f CH |
96 | |
97 | return iflags; | |
98 | } | |
99 | ||
100 | /* | |
101 | * Update inode->i_flags based on the btrfs internal flags. | |
102 | */ | |
103 | void btrfs_update_iflags(struct inode *inode) | |
104 | { | |
105 | struct btrfs_inode *ip = BTRFS_I(inode); | |
106 | ||
107 | inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
108 | ||
109 | if (ip->flags & BTRFS_INODE_SYNC) | |
110 | inode->i_flags |= S_SYNC; | |
111 | if (ip->flags & BTRFS_INODE_IMMUTABLE) | |
112 | inode->i_flags |= S_IMMUTABLE; | |
113 | if (ip->flags & BTRFS_INODE_APPEND) | |
114 | inode->i_flags |= S_APPEND; | |
115 | if (ip->flags & BTRFS_INODE_NOATIME) | |
116 | inode->i_flags |= S_NOATIME; | |
117 | if (ip->flags & BTRFS_INODE_DIRSYNC) | |
118 | inode->i_flags |= S_DIRSYNC; | |
119 | } | |
120 | ||
121 | /* | |
122 | * Inherit flags from the parent inode. | |
123 | * | |
e27425d6 | 124 | * Currently only the compression flags and the cow flags are inherited. |
6cbff00f CH |
125 | */ |
126 | void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) | |
127 | { | |
0b4dcea5 CM |
128 | unsigned int flags; |
129 | ||
130 | if (!dir) | |
131 | return; | |
132 | ||
133 | flags = BTRFS_I(dir)->flags; | |
6cbff00f | 134 | |
e27425d6 JB |
135 | if (flags & BTRFS_INODE_NOCOMPRESS) { |
136 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; | |
137 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; | |
138 | } else if (flags & BTRFS_INODE_COMPRESS) { | |
139 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
140 | BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; | |
141 | } | |
142 | ||
143 | if (flags & BTRFS_INODE_NODATACOW) | |
144 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; | |
6cbff00f | 145 | |
6cbff00f CH |
146 | btrfs_update_iflags(inode); |
147 | } | |
148 | ||
149 | static int btrfs_ioctl_getflags(struct file *file, void __user *arg) | |
150 | { | |
151 | struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); | |
152 | unsigned int flags = btrfs_flags_to_ioctl(ip->flags); | |
153 | ||
154 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
155 | return -EFAULT; | |
156 | return 0; | |
157 | } | |
158 | ||
75e7cb7f LB |
159 | static int check_flags(unsigned int flags) |
160 | { | |
161 | if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ | |
162 | FS_NOATIME_FL | FS_NODUMP_FL | \ | |
163 | FS_SYNC_FL | FS_DIRSYNC_FL | \ | |
e1e8fb6a LZ |
164 | FS_NOCOMP_FL | FS_COMPR_FL | |
165 | FS_NOCOW_FL)) | |
75e7cb7f LB |
166 | return -EOPNOTSUPP; |
167 | ||
168 | if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) | |
169 | return -EINVAL; | |
170 | ||
75e7cb7f LB |
171 | return 0; |
172 | } | |
173 | ||
6cbff00f CH |
174 | static int btrfs_ioctl_setflags(struct file *file, void __user *arg) |
175 | { | |
176 | struct inode *inode = file->f_path.dentry->d_inode; | |
177 | struct btrfs_inode *ip = BTRFS_I(inode); | |
178 | struct btrfs_root *root = ip->root; | |
179 | struct btrfs_trans_handle *trans; | |
180 | unsigned int flags, oldflags; | |
181 | int ret; | |
f062abf0 LZ |
182 | u64 ip_oldflags; |
183 | unsigned int i_oldflags; | |
7e97b8da | 184 | umode_t mode; |
6cbff00f | 185 | |
b83cc969 LZ |
186 | if (btrfs_root_readonly(root)) |
187 | return -EROFS; | |
188 | ||
6cbff00f CH |
189 | if (copy_from_user(&flags, arg, sizeof(flags))) |
190 | return -EFAULT; | |
191 | ||
75e7cb7f LB |
192 | ret = check_flags(flags); |
193 | if (ret) | |
194 | return ret; | |
f46b5a66 | 195 | |
2e149670 | 196 | if (!inode_owner_or_capable(inode)) |
6cbff00f CH |
197 | return -EACCES; |
198 | ||
e7848683 JK |
199 | ret = mnt_want_write_file(file); |
200 | if (ret) | |
201 | return ret; | |
202 | ||
6cbff00f CH |
203 | mutex_lock(&inode->i_mutex); |
204 | ||
f062abf0 LZ |
205 | ip_oldflags = ip->flags; |
206 | i_oldflags = inode->i_flags; | |
7e97b8da | 207 | mode = inode->i_mode; |
f062abf0 | 208 | |
6cbff00f CH |
209 | flags = btrfs_mask_flags(inode->i_mode, flags); |
210 | oldflags = btrfs_flags_to_ioctl(ip->flags); | |
211 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { | |
212 | if (!capable(CAP_LINUX_IMMUTABLE)) { | |
213 | ret = -EPERM; | |
214 | goto out_unlock; | |
215 | } | |
216 | } | |
217 | ||
6cbff00f CH |
218 | if (flags & FS_SYNC_FL) |
219 | ip->flags |= BTRFS_INODE_SYNC; | |
220 | else | |
221 | ip->flags &= ~BTRFS_INODE_SYNC; | |
222 | if (flags & FS_IMMUTABLE_FL) | |
223 | ip->flags |= BTRFS_INODE_IMMUTABLE; | |
224 | else | |
225 | ip->flags &= ~BTRFS_INODE_IMMUTABLE; | |
226 | if (flags & FS_APPEND_FL) | |
227 | ip->flags |= BTRFS_INODE_APPEND; | |
228 | else | |
229 | ip->flags &= ~BTRFS_INODE_APPEND; | |
230 | if (flags & FS_NODUMP_FL) | |
231 | ip->flags |= BTRFS_INODE_NODUMP; | |
232 | else | |
233 | ip->flags &= ~BTRFS_INODE_NODUMP; | |
234 | if (flags & FS_NOATIME_FL) | |
235 | ip->flags |= BTRFS_INODE_NOATIME; | |
236 | else | |
237 | ip->flags &= ~BTRFS_INODE_NOATIME; | |
238 | if (flags & FS_DIRSYNC_FL) | |
239 | ip->flags |= BTRFS_INODE_DIRSYNC; | |
240 | else | |
241 | ip->flags &= ~BTRFS_INODE_DIRSYNC; | |
7e97b8da DS |
242 | if (flags & FS_NOCOW_FL) { |
243 | if (S_ISREG(mode)) { | |
244 | /* | |
245 | * It's safe to turn csums off here, no extents exist. | |
246 | * Otherwise we want the flag to reflect the real COW | |
247 | * status of the file and will not set it. | |
248 | */ | |
249 | if (inode->i_size == 0) | |
250 | ip->flags |= BTRFS_INODE_NODATACOW | |
251 | | BTRFS_INODE_NODATASUM; | |
252 | } else { | |
253 | ip->flags |= BTRFS_INODE_NODATACOW; | |
254 | } | |
255 | } else { | |
256 | /* | |
257 | * Revert back under same assuptions as above | |
258 | */ | |
259 | if (S_ISREG(mode)) { | |
260 | if (inode->i_size == 0) | |
261 | ip->flags &= ~(BTRFS_INODE_NODATACOW | |
262 | | BTRFS_INODE_NODATASUM); | |
263 | } else { | |
264 | ip->flags &= ~BTRFS_INODE_NODATACOW; | |
265 | } | |
266 | } | |
6cbff00f | 267 | |
75e7cb7f LB |
268 | /* |
269 | * The COMPRESS flag can only be changed by users, while the NOCOMPRESS | |
270 | * flag may be changed automatically if compression code won't make | |
271 | * things smaller. | |
272 | */ | |
273 | if (flags & FS_NOCOMP_FL) { | |
274 | ip->flags &= ~BTRFS_INODE_COMPRESS; | |
275 | ip->flags |= BTRFS_INODE_NOCOMPRESS; | |
276 | } else if (flags & FS_COMPR_FL) { | |
277 | ip->flags |= BTRFS_INODE_COMPRESS; | |
278 | ip->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
ebcb904d LZ |
279 | } else { |
280 | ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); | |
75e7cb7f | 281 | } |
6cbff00f | 282 | |
4da6f1a3 | 283 | trans = btrfs_start_transaction(root, 1); |
f062abf0 LZ |
284 | if (IS_ERR(trans)) { |
285 | ret = PTR_ERR(trans); | |
286 | goto out_drop; | |
287 | } | |
6cbff00f | 288 | |
306424cc | 289 | btrfs_update_iflags(inode); |
0c4d2d95 | 290 | inode_inc_iversion(inode); |
306424cc | 291 | inode->i_ctime = CURRENT_TIME; |
6cbff00f | 292 | ret = btrfs_update_inode(trans, root, inode); |
6cbff00f | 293 | |
6cbff00f | 294 | btrfs_end_transaction(trans, root); |
f062abf0 LZ |
295 | out_drop: |
296 | if (ret) { | |
297 | ip->flags = ip_oldflags; | |
298 | inode->i_flags = i_oldflags; | |
299 | } | |
6cbff00f | 300 | |
6cbff00f CH |
301 | out_unlock: |
302 | mutex_unlock(&inode->i_mutex); | |
e7848683 | 303 | mnt_drop_write_file(file); |
2d4e6f6a | 304 | return ret; |
6cbff00f CH |
305 | } |
306 | ||
307 | static int btrfs_ioctl_getversion(struct file *file, int __user *arg) | |
308 | { | |
309 | struct inode *inode = file->f_path.dentry->d_inode; | |
310 | ||
311 | return put_user(inode->i_generation, arg); | |
312 | } | |
f46b5a66 | 313 | |
f7039b1d LD |
314 | static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) |
315 | { | |
815745cf | 316 | struct btrfs_fs_info *fs_info = btrfs_sb(fdentry(file)->d_sb); |
f7039b1d LD |
317 | struct btrfs_device *device; |
318 | struct request_queue *q; | |
319 | struct fstrim_range range; | |
320 | u64 minlen = ULLONG_MAX; | |
321 | u64 num_devices = 0; | |
815745cf | 322 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
f7039b1d LD |
323 | int ret; |
324 | ||
325 | if (!capable(CAP_SYS_ADMIN)) | |
326 | return -EPERM; | |
327 | ||
1f78160c XG |
328 | rcu_read_lock(); |
329 | list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, | |
330 | dev_list) { | |
f7039b1d LD |
331 | if (!device->bdev) |
332 | continue; | |
333 | q = bdev_get_queue(device->bdev); | |
334 | if (blk_queue_discard(q)) { | |
335 | num_devices++; | |
336 | minlen = min((u64)q->limits.discard_granularity, | |
337 | minlen); | |
338 | } | |
339 | } | |
1f78160c | 340 | rcu_read_unlock(); |
f4c697e6 | 341 | |
f7039b1d LD |
342 | if (!num_devices) |
343 | return -EOPNOTSUPP; | |
f7039b1d LD |
344 | if (copy_from_user(&range, arg, sizeof(range))) |
345 | return -EFAULT; | |
e515c18b LC |
346 | if (range.start > total_bytes || |
347 | range.len < fs_info->sb->s_blocksize) | |
f4c697e6 | 348 | return -EINVAL; |
f7039b1d | 349 | |
f4c697e6 | 350 | range.len = min(range.len, total_bytes - range.start); |
f7039b1d | 351 | range.minlen = max(range.minlen, minlen); |
815745cf | 352 | ret = btrfs_trim_fs(fs_info->tree_root, &range); |
f7039b1d LD |
353 | if (ret < 0) |
354 | return ret; | |
355 | ||
356 | if (copy_to_user(arg, &range, sizeof(range))) | |
357 | return -EFAULT; | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
cb8e7090 CH |
362 | static noinline int create_subvol(struct btrfs_root *root, |
363 | struct dentry *dentry, | |
72fd032e | 364 | char *name, int namelen, |
6f72c7e2 AJ |
365 | u64 *async_transid, |
366 | struct btrfs_qgroup_inherit **inherit) | |
f46b5a66 CH |
367 | { |
368 | struct btrfs_trans_handle *trans; | |
369 | struct btrfs_key key; | |
370 | struct btrfs_root_item root_item; | |
371 | struct btrfs_inode_item *inode_item; | |
372 | struct extent_buffer *leaf; | |
76dda93c | 373 | struct btrfs_root *new_root; |
2fbe8c8a | 374 | struct dentry *parent = dentry->d_parent; |
6a912213 | 375 | struct inode *dir; |
8ea05e3a | 376 | struct timespec cur_time = CURRENT_TIME; |
f46b5a66 CH |
377 | int ret; |
378 | int err; | |
379 | u64 objectid; | |
380 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
3de4586c | 381 | u64 index = 0; |
8ea05e3a | 382 | uuid_le new_uuid; |
f46b5a66 | 383 | |
581bb050 | 384 | ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); |
2fbe8c8a | 385 | if (ret) |
a22285a6 | 386 | return ret; |
6a912213 JB |
387 | |
388 | dir = parent->d_inode; | |
389 | ||
9ed74f2d JB |
390 | /* |
391 | * 1 - inode item | |
392 | * 2 - refs | |
393 | * 1 - root item | |
394 | * 2 - dir items | |
395 | */ | |
a22285a6 | 396 | trans = btrfs_start_transaction(root, 6); |
2fbe8c8a | 397 | if (IS_ERR(trans)) |
a22285a6 | 398 | return PTR_ERR(trans); |
f46b5a66 | 399 | |
6f72c7e2 AJ |
400 | ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, |
401 | inherit ? *inherit : NULL); | |
402 | if (ret) | |
403 | goto fail; | |
404 | ||
5d4f98a2 | 405 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, |
5581a51a | 406 | 0, objectid, NULL, 0, 0, 0); |
8e8a1e31 JB |
407 | if (IS_ERR(leaf)) { |
408 | ret = PTR_ERR(leaf); | |
409 | goto fail; | |
410 | } | |
f46b5a66 | 411 | |
5d4f98a2 | 412 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
f46b5a66 CH |
413 | btrfs_set_header_bytenr(leaf, leaf->start); |
414 | btrfs_set_header_generation(leaf, trans->transid); | |
5d4f98a2 | 415 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); |
f46b5a66 CH |
416 | btrfs_set_header_owner(leaf, objectid); |
417 | ||
418 | write_extent_buffer(leaf, root->fs_info->fsid, | |
419 | (unsigned long)btrfs_header_fsid(leaf), | |
420 | BTRFS_FSID_SIZE); | |
5d4f98a2 YZ |
421 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, |
422 | (unsigned long)btrfs_header_chunk_tree_uuid(leaf), | |
423 | BTRFS_UUID_SIZE); | |
f46b5a66 CH |
424 | btrfs_mark_buffer_dirty(leaf); |
425 | ||
8ea05e3a AB |
426 | memset(&root_item, 0, sizeof(root_item)); |
427 | ||
f46b5a66 | 428 | inode_item = &root_item.inode; |
f46b5a66 CH |
429 | inode_item->generation = cpu_to_le64(1); |
430 | inode_item->size = cpu_to_le64(3); | |
431 | inode_item->nlink = cpu_to_le32(1); | |
a76a3cd4 | 432 | inode_item->nbytes = cpu_to_le64(root->leafsize); |
f46b5a66 CH |
433 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); |
434 | ||
08fe4db1 LZ |
435 | root_item.flags = 0; |
436 | root_item.byte_limit = 0; | |
437 | inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT); | |
438 | ||
f46b5a66 | 439 | btrfs_set_root_bytenr(&root_item, leaf->start); |
84234f3a | 440 | btrfs_set_root_generation(&root_item, trans->transid); |
f46b5a66 CH |
441 | btrfs_set_root_level(&root_item, 0); |
442 | btrfs_set_root_refs(&root_item, 1); | |
86b9f2ec | 443 | btrfs_set_root_used(&root_item, leaf->len); |
80ff3856 | 444 | btrfs_set_root_last_snapshot(&root_item, 0); |
f46b5a66 | 445 | |
8ea05e3a AB |
446 | btrfs_set_root_generation_v2(&root_item, |
447 | btrfs_root_generation(&root_item)); | |
448 | uuid_le_gen(&new_uuid); | |
449 | memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); | |
450 | root_item.otime.sec = cpu_to_le64(cur_time.tv_sec); | |
dadd1105 | 451 | root_item.otime.nsec = cpu_to_le32(cur_time.tv_nsec); |
8ea05e3a AB |
452 | root_item.ctime = root_item.otime; |
453 | btrfs_set_root_ctransid(&root_item, trans->transid); | |
454 | btrfs_set_root_otransid(&root_item, trans->transid); | |
f46b5a66 | 455 | |
925baedd | 456 | btrfs_tree_unlock(leaf); |
f46b5a66 CH |
457 | free_extent_buffer(leaf); |
458 | leaf = NULL; | |
459 | ||
460 | btrfs_set_root_dirid(&root_item, new_dirid); | |
461 | ||
462 | key.objectid = objectid; | |
5d4f98a2 | 463 | key.offset = 0; |
f46b5a66 CH |
464 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
465 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
466 | &root_item); | |
467 | if (ret) | |
468 | goto fail; | |
469 | ||
76dda93c YZ |
470 | key.offset = (u64)-1; |
471 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); | |
79787eaa JM |
472 | if (IS_ERR(new_root)) { |
473 | btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); | |
474 | ret = PTR_ERR(new_root); | |
475 | goto fail; | |
476 | } | |
76dda93c YZ |
477 | |
478 | btrfs_record_root_in_trans(trans, new_root); | |
479 | ||
d82a6f1d | 480 | ret = btrfs_create_subvol_root(trans, new_root, new_dirid); |
ce598979 MF |
481 | if (ret) { |
482 | /* We potentially lose an unused inode item here */ | |
79787eaa | 483 | btrfs_abort_transaction(trans, root, ret); |
ce598979 MF |
484 | goto fail; |
485 | } | |
486 | ||
f46b5a66 CH |
487 | /* |
488 | * insert the directory item | |
489 | */ | |
3de4586c | 490 | ret = btrfs_set_inode_index(dir, &index); |
79787eaa JM |
491 | if (ret) { |
492 | btrfs_abort_transaction(trans, root, ret); | |
493 | goto fail; | |
494 | } | |
3de4586c CM |
495 | |
496 | ret = btrfs_insert_dir_item(trans, root, | |
16cdcec7 | 497 | name, namelen, dir, &key, |
3de4586c | 498 | BTRFS_FT_DIR, index); |
79787eaa JM |
499 | if (ret) { |
500 | btrfs_abort_transaction(trans, root, ret); | |
f46b5a66 | 501 | goto fail; |
79787eaa | 502 | } |
0660b5af | 503 | |
52c26179 YZ |
504 | btrfs_i_size_write(dir, dir->i_size + namelen * 2); |
505 | ret = btrfs_update_inode(trans, root, dir); | |
506 | BUG_ON(ret); | |
507 | ||
0660b5af | 508 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
4df27c4d | 509 | objectid, root->root_key.objectid, |
33345d01 | 510 | btrfs_ino(dir), index, name, namelen); |
0660b5af | 511 | |
76dda93c | 512 | BUG_ON(ret); |
f46b5a66 | 513 | |
76dda93c | 514 | d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); |
f46b5a66 | 515 | fail: |
72fd032e SW |
516 | if (async_transid) { |
517 | *async_transid = trans->transid; | |
518 | err = btrfs_commit_transaction_async(trans, root, 1); | |
519 | } else { | |
520 | err = btrfs_commit_transaction(trans, root); | |
521 | } | |
f46b5a66 CH |
522 | if (err && !ret) |
523 | ret = err; | |
f46b5a66 CH |
524 | return ret; |
525 | } | |
526 | ||
72fd032e | 527 | static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, |
b83cc969 | 528 | char *name, int namelen, u64 *async_transid, |
6f72c7e2 | 529 | bool readonly, struct btrfs_qgroup_inherit **inherit) |
f46b5a66 | 530 | { |
2e4bfab9 | 531 | struct inode *inode; |
f46b5a66 CH |
532 | struct btrfs_pending_snapshot *pending_snapshot; |
533 | struct btrfs_trans_handle *trans; | |
2e4bfab9 | 534 | int ret; |
f46b5a66 CH |
535 | |
536 | if (!root->ref_cows) | |
537 | return -EINVAL; | |
538 | ||
3de4586c | 539 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
a22285a6 YZ |
540 | if (!pending_snapshot) |
541 | return -ENOMEM; | |
542 | ||
66d8f3dd MX |
543 | btrfs_init_block_rsv(&pending_snapshot->block_rsv, |
544 | BTRFS_BLOCK_RSV_TEMP); | |
3de4586c | 545 | pending_snapshot->dentry = dentry; |
f46b5a66 | 546 | pending_snapshot->root = root; |
b83cc969 | 547 | pending_snapshot->readonly = readonly; |
6f72c7e2 AJ |
548 | if (inherit) { |
549 | pending_snapshot->inherit = *inherit; | |
550 | *inherit = NULL; /* take responsibility to free it */ | |
551 | } | |
a22285a6 | 552 | |
48c03c4b | 553 | trans = btrfs_start_transaction(root->fs_info->extent_root, 6); |
a22285a6 YZ |
554 | if (IS_ERR(trans)) { |
555 | ret = PTR_ERR(trans); | |
556 | goto fail; | |
557 | } | |
558 | ||
559 | ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); | |
560 | BUG_ON(ret); | |
561 | ||
8351583e | 562 | spin_lock(&root->fs_info->trans_lock); |
f46b5a66 CH |
563 | list_add(&pending_snapshot->list, |
564 | &trans->transaction->pending_snapshots); | |
8351583e | 565 | spin_unlock(&root->fs_info->trans_lock); |
72fd032e SW |
566 | if (async_transid) { |
567 | *async_transid = trans->transid; | |
568 | ret = btrfs_commit_transaction_async(trans, | |
569 | root->fs_info->extent_root, 1); | |
570 | } else { | |
571 | ret = btrfs_commit_transaction(trans, | |
572 | root->fs_info->extent_root); | |
573 | } | |
c37b2b62 JB |
574 | if (ret) |
575 | goto fail; | |
a22285a6 YZ |
576 | |
577 | ret = pending_snapshot->error; | |
578 | if (ret) | |
579 | goto fail; | |
580 | ||
66b4ffd1 JB |
581 | ret = btrfs_orphan_cleanup(pending_snapshot->snap); |
582 | if (ret) | |
583 | goto fail; | |
f46b5a66 | 584 | |
2fbe8c8a | 585 | inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); |
2e4bfab9 YZ |
586 | if (IS_ERR(inode)) { |
587 | ret = PTR_ERR(inode); | |
588 | goto fail; | |
589 | } | |
590 | BUG_ON(!inode); | |
591 | d_instantiate(dentry, inode); | |
592 | ret = 0; | |
593 | fail: | |
a22285a6 | 594 | kfree(pending_snapshot); |
f46b5a66 CH |
595 | return ret; |
596 | } | |
597 | ||
4260f7c7 SW |
598 | /* copy of check_sticky in fs/namei.c() |
599 | * It's inline, so penalty for filesystems that don't use sticky bit is | |
600 | * minimal. | |
601 | */ | |
602 | static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) | |
603 | { | |
2f2f43d3 | 604 | kuid_t fsuid = current_fsuid(); |
4260f7c7 SW |
605 | |
606 | if (!(dir->i_mode & S_ISVTX)) | |
607 | return 0; | |
2f2f43d3 | 608 | if (uid_eq(inode->i_uid, fsuid)) |
4260f7c7 | 609 | return 0; |
2f2f43d3 | 610 | if (uid_eq(dir->i_uid, fsuid)) |
4260f7c7 SW |
611 | return 0; |
612 | return !capable(CAP_FOWNER); | |
613 | } | |
614 | ||
615 | /* copy of may_delete in fs/namei.c() | |
616 | * Check whether we can remove a link victim from directory dir, check | |
617 | * whether the type of victim is right. | |
618 | * 1. We can't do it if dir is read-only (done in permission()) | |
619 | * 2. We should have write and exec permissions on dir | |
620 | * 3. We can't remove anything from append-only dir | |
621 | * 4. We can't do anything with immutable dir (done in permission()) | |
622 | * 5. If the sticky bit on dir is set we should either | |
623 | * a. be owner of dir, or | |
624 | * b. be owner of victim, or | |
625 | * c. have CAP_FOWNER capability | |
626 | * 6. If the victim is append-only or immutable we can't do antyhing with | |
627 | * links pointing to it. | |
628 | * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. | |
629 | * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. | |
630 | * 9. We can't remove a root or mountpoint. | |
631 | * 10. We don't allow removal of NFS sillyrenamed files; it's handled by | |
632 | * nfs_async_unlink(). | |
633 | */ | |
634 | ||
635 | static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) | |
636 | { | |
637 | int error; | |
638 | ||
639 | if (!victim->d_inode) | |
640 | return -ENOENT; | |
641 | ||
642 | BUG_ON(victim->d_parent->d_inode != dir); | |
4fa6b5ec | 643 | audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); |
4260f7c7 SW |
644 | |
645 | error = inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
646 | if (error) | |
647 | return error; | |
648 | if (IS_APPEND(dir)) | |
649 | return -EPERM; | |
650 | if (btrfs_check_sticky(dir, victim->d_inode)|| | |
651 | IS_APPEND(victim->d_inode)|| | |
652 | IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) | |
653 | return -EPERM; | |
654 | if (isdir) { | |
655 | if (!S_ISDIR(victim->d_inode->i_mode)) | |
656 | return -ENOTDIR; | |
657 | if (IS_ROOT(victim)) | |
658 | return -EBUSY; | |
659 | } else if (S_ISDIR(victim->d_inode->i_mode)) | |
660 | return -EISDIR; | |
661 | if (IS_DEADDIR(dir)) | |
662 | return -ENOENT; | |
663 | if (victim->d_flags & DCACHE_NFSFS_RENAMED) | |
664 | return -EBUSY; | |
665 | return 0; | |
666 | } | |
667 | ||
cb8e7090 CH |
668 | /* copy of may_create in fs/namei.c() */ |
669 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
670 | { | |
671 | if (child->d_inode) | |
672 | return -EEXIST; | |
673 | if (IS_DEADDIR(dir)) | |
674 | return -ENOENT; | |
675 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
676 | } | |
677 | ||
678 | /* | |
679 | * Create a new subvolume below @parent. This is largely modeled after | |
680 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
681 | * inside this filesystem so it's quite a bit simpler. | |
682 | */ | |
76dda93c YZ |
683 | static noinline int btrfs_mksubvol(struct path *parent, |
684 | char *name, int namelen, | |
72fd032e | 685 | struct btrfs_root *snap_src, |
6f72c7e2 AJ |
686 | u64 *async_transid, bool readonly, |
687 | struct btrfs_qgroup_inherit **inherit) | |
cb8e7090 | 688 | { |
76dda93c | 689 | struct inode *dir = parent->dentry->d_inode; |
cb8e7090 CH |
690 | struct dentry *dentry; |
691 | int error; | |
692 | ||
76dda93c | 693 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
cb8e7090 CH |
694 | |
695 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
696 | error = PTR_ERR(dentry); | |
697 | if (IS_ERR(dentry)) | |
698 | goto out_unlock; | |
699 | ||
700 | error = -EEXIST; | |
701 | if (dentry->d_inode) | |
702 | goto out_dput; | |
703 | ||
76dda93c | 704 | error = btrfs_may_create(dir, dentry); |
cb8e7090 | 705 | if (error) |
a874a63e | 706 | goto out_dput; |
cb8e7090 | 707 | |
76dda93c YZ |
708 | down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); |
709 | ||
710 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) | |
711 | goto out_up_read; | |
712 | ||
3de4586c | 713 | if (snap_src) { |
6f72c7e2 AJ |
714 | error = create_snapshot(snap_src, dentry, name, namelen, |
715 | async_transid, readonly, inherit); | |
3de4586c | 716 | } else { |
76dda93c | 717 | error = create_subvol(BTRFS_I(dir)->root, dentry, |
6f72c7e2 | 718 | name, namelen, async_transid, inherit); |
3de4586c | 719 | } |
76dda93c YZ |
720 | if (!error) |
721 | fsnotify_mkdir(dir, dentry); | |
722 | out_up_read: | |
723 | up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); | |
cb8e7090 CH |
724 | out_dput: |
725 | dput(dentry); | |
726 | out_unlock: | |
76dda93c | 727 | mutex_unlock(&dir->i_mutex); |
cb8e7090 CH |
728 | return error; |
729 | } | |
730 | ||
4cb5300b CM |
731 | /* |
732 | * When we're defragging a range, we don't want to kick it off again | |
733 | * if it is really just waiting for delalloc to send it down. | |
734 | * If we find a nice big extent or delalloc range for the bytes in the | |
735 | * file you want to defrag, we return 0 to let you know to skip this | |
736 | * part of the file | |
737 | */ | |
738 | static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) | |
739 | { | |
740 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
741 | struct extent_map *em = NULL; | |
742 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
743 | u64 end; | |
744 | ||
745 | read_lock(&em_tree->lock); | |
746 | em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); | |
747 | read_unlock(&em_tree->lock); | |
748 | ||
749 | if (em) { | |
750 | end = extent_map_end(em); | |
751 | free_extent_map(em); | |
752 | if (end - offset > thresh) | |
753 | return 0; | |
754 | } | |
755 | /* if we already have a nice delalloc here, just stop */ | |
756 | thresh /= 2; | |
757 | end = count_range_bits(io_tree, &offset, offset + thresh, | |
758 | thresh, EXTENT_DELALLOC, 1); | |
759 | if (end >= thresh) | |
760 | return 0; | |
761 | return 1; | |
762 | } | |
763 | ||
764 | /* | |
765 | * helper function to walk through a file and find extents | |
766 | * newer than a specific transid, and smaller than thresh. | |
767 | * | |
768 | * This is used by the defragging code to find new and small | |
769 | * extents | |
770 | */ | |
771 | static int find_new_extents(struct btrfs_root *root, | |
772 | struct inode *inode, u64 newer_than, | |
773 | u64 *off, int thresh) | |
774 | { | |
775 | struct btrfs_path *path; | |
776 | struct btrfs_key min_key; | |
777 | struct btrfs_key max_key; | |
778 | struct extent_buffer *leaf; | |
779 | struct btrfs_file_extent_item *extent; | |
780 | int type; | |
781 | int ret; | |
a4689d2b | 782 | u64 ino = btrfs_ino(inode); |
4cb5300b CM |
783 | |
784 | path = btrfs_alloc_path(); | |
785 | if (!path) | |
786 | return -ENOMEM; | |
787 | ||
a4689d2b | 788 | min_key.objectid = ino; |
4cb5300b CM |
789 | min_key.type = BTRFS_EXTENT_DATA_KEY; |
790 | min_key.offset = *off; | |
791 | ||
a4689d2b | 792 | max_key.objectid = ino; |
4cb5300b CM |
793 | max_key.type = (u8)-1; |
794 | max_key.offset = (u64)-1; | |
795 | ||
796 | path->keep_locks = 1; | |
797 | ||
798 | while(1) { | |
799 | ret = btrfs_search_forward(root, &min_key, &max_key, | |
800 | path, 0, newer_than); | |
801 | if (ret != 0) | |
802 | goto none; | |
a4689d2b | 803 | if (min_key.objectid != ino) |
4cb5300b CM |
804 | goto none; |
805 | if (min_key.type != BTRFS_EXTENT_DATA_KEY) | |
806 | goto none; | |
807 | ||
808 | leaf = path->nodes[0]; | |
809 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
810 | struct btrfs_file_extent_item); | |
811 | ||
812 | type = btrfs_file_extent_type(leaf, extent); | |
813 | if (type == BTRFS_FILE_EXTENT_REG && | |
814 | btrfs_file_extent_num_bytes(leaf, extent) < thresh && | |
815 | check_defrag_in_cache(inode, min_key.offset, thresh)) { | |
816 | *off = min_key.offset; | |
817 | btrfs_free_path(path); | |
818 | return 0; | |
819 | } | |
820 | ||
821 | if (min_key.offset == (u64)-1) | |
822 | goto none; | |
823 | ||
824 | min_key.offset++; | |
825 | btrfs_release_path(path); | |
826 | } | |
827 | none: | |
828 | btrfs_free_path(path); | |
829 | return -ENOENT; | |
830 | } | |
831 | ||
6c282eb4 | 832 | static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) |
17ce6ef8 LB |
833 | { |
834 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
6c282eb4 LZ |
835 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
836 | struct extent_map *em; | |
837 | u64 len = PAGE_CACHE_SIZE; | |
17ce6ef8 | 838 | |
6c282eb4 LZ |
839 | /* |
840 | * hopefully we have this extent in the tree already, try without | |
841 | * the full extent lock | |
842 | */ | |
17ce6ef8 | 843 | read_lock(&em_tree->lock); |
6c282eb4 | 844 | em = lookup_extent_mapping(em_tree, start, len); |
17ce6ef8 LB |
845 | read_unlock(&em_tree->lock); |
846 | ||
6c282eb4 LZ |
847 | if (!em) { |
848 | /* get the big lock and read metadata off disk */ | |
849 | lock_extent(io_tree, start, start + len - 1); | |
850 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); | |
851 | unlock_extent(io_tree, start, start + len - 1); | |
852 | ||
853 | if (IS_ERR(em)) | |
854 | return NULL; | |
855 | } | |
856 | ||
857 | return em; | |
858 | } | |
17ce6ef8 | 859 | |
6c282eb4 LZ |
860 | static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) |
861 | { | |
862 | struct extent_map *next; | |
863 | bool ret = true; | |
864 | ||
865 | /* this is the last extent */ | |
866 | if (em->start + em->len >= i_size_read(inode)) | |
867 | return false; | |
868 | ||
869 | next = defrag_lookup_extent(inode, em->start + em->len); | |
870 | if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) | |
871 | ret = false; | |
872 | ||
873 | free_extent_map(next); | |
17ce6ef8 LB |
874 | return ret; |
875 | } | |
876 | ||
6c282eb4 | 877 | static int should_defrag_range(struct inode *inode, u64 start, int thresh, |
a43a2111 AM |
878 | u64 *last_len, u64 *skip, u64 *defrag_end, |
879 | int compress) | |
940100a4 | 880 | { |
6c282eb4 | 881 | struct extent_map *em; |
940100a4 | 882 | int ret = 1; |
6c282eb4 | 883 | bool next_mergeable = true; |
940100a4 CM |
884 | |
885 | /* | |
008873ea | 886 | * make sure that once we start defragging an extent, we keep on |
940100a4 CM |
887 | * defragging it |
888 | */ | |
889 | if (start < *defrag_end) | |
890 | return 1; | |
891 | ||
892 | *skip = 0; | |
893 | ||
6c282eb4 LZ |
894 | em = defrag_lookup_extent(inode, start); |
895 | if (!em) | |
896 | return 0; | |
940100a4 CM |
897 | |
898 | /* this will cover holes, and inline extents */ | |
17ce6ef8 | 899 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { |
940100a4 | 900 | ret = 0; |
17ce6ef8 LB |
901 | goto out; |
902 | } | |
903 | ||
6c282eb4 | 904 | next_mergeable = defrag_check_next_extent(inode, em); |
940100a4 CM |
905 | |
906 | /* | |
6c282eb4 LZ |
907 | * we hit a real extent, if it is big or the next extent is not a |
908 | * real extent, don't bother defragging it | |
940100a4 | 909 | */ |
a43a2111 | 910 | if (!compress && (*last_len == 0 || *last_len >= thresh) && |
6c282eb4 | 911 | (em->len >= thresh || !next_mergeable)) |
940100a4 | 912 | ret = 0; |
17ce6ef8 | 913 | out: |
940100a4 CM |
914 | /* |
915 | * last_len ends up being a counter of how many bytes we've defragged. | |
916 | * every time we choose not to defrag an extent, we reset *last_len | |
917 | * so that the next tiny extent will force a defrag. | |
918 | * | |
919 | * The end result of this is that tiny extents before a single big | |
920 | * extent will force at least part of that big extent to be defragged. | |
921 | */ | |
922 | if (ret) { | |
940100a4 CM |
923 | *defrag_end = extent_map_end(em); |
924 | } else { | |
925 | *last_len = 0; | |
926 | *skip = extent_map_end(em); | |
927 | *defrag_end = 0; | |
928 | } | |
929 | ||
930 | free_extent_map(em); | |
931 | return ret; | |
932 | } | |
933 | ||
4cb5300b CM |
934 | /* |
935 | * it doesn't do much good to defrag one or two pages | |
936 | * at a time. This pulls in a nice chunk of pages | |
937 | * to COW and defrag. | |
938 | * | |
939 | * It also makes sure the delalloc code has enough | |
940 | * dirty data to avoid making new small extents as part | |
941 | * of the defrag | |
942 | * | |
943 | * It's a good idea to start RA on this range | |
944 | * before calling this. | |
945 | */ | |
946 | static int cluster_pages_for_defrag(struct inode *inode, | |
947 | struct page **pages, | |
948 | unsigned long start_index, | |
949 | int num_pages) | |
f46b5a66 | 950 | { |
4cb5300b CM |
951 | unsigned long file_end; |
952 | u64 isize = i_size_read(inode); | |
953 | u64 page_start; | |
954 | u64 page_end; | |
1f12bd06 | 955 | u64 page_cnt; |
4cb5300b CM |
956 | int ret; |
957 | int i; | |
958 | int i_done; | |
3eaa2885 | 959 | struct btrfs_ordered_extent *ordered; |
4cb5300b | 960 | struct extent_state *cached_state = NULL; |
600a45e1 | 961 | struct extent_io_tree *tree; |
3b16a4e3 | 962 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
4cb5300b | 963 | |
4cb5300b | 964 | file_end = (isize - 1) >> PAGE_CACHE_SHIFT; |
1f12bd06 LB |
965 | if (!isize || start_index > file_end) |
966 | return 0; | |
967 | ||
968 | page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); | |
4cb5300b CM |
969 | |
970 | ret = btrfs_delalloc_reserve_space(inode, | |
1f12bd06 | 971 | page_cnt << PAGE_CACHE_SHIFT); |
4cb5300b CM |
972 | if (ret) |
973 | return ret; | |
4cb5300b | 974 | i_done = 0; |
600a45e1 | 975 | tree = &BTRFS_I(inode)->io_tree; |
4cb5300b CM |
976 | |
977 | /* step one, lock all the pages */ | |
1f12bd06 | 978 | for (i = 0; i < page_cnt; i++) { |
4cb5300b | 979 | struct page *page; |
600a45e1 | 980 | again: |
a94733d0 | 981 | page = find_or_create_page(inode->i_mapping, |
600a45e1 | 982 | start_index + i, mask); |
4cb5300b CM |
983 | if (!page) |
984 | break; | |
985 | ||
600a45e1 MX |
986 | page_start = page_offset(page); |
987 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
988 | while (1) { | |
d0082371 | 989 | lock_extent(tree, page_start, page_end); |
600a45e1 MX |
990 | ordered = btrfs_lookup_ordered_extent(inode, |
991 | page_start); | |
d0082371 | 992 | unlock_extent(tree, page_start, page_end); |
600a45e1 MX |
993 | if (!ordered) |
994 | break; | |
995 | ||
996 | unlock_page(page); | |
997 | btrfs_start_ordered_extent(inode, ordered, 1); | |
998 | btrfs_put_ordered_extent(ordered); | |
999 | lock_page(page); | |
1f12bd06 LB |
1000 | /* |
1001 | * we unlocked the page above, so we need check if | |
1002 | * it was released or not. | |
1003 | */ | |
1004 | if (page->mapping != inode->i_mapping) { | |
1005 | unlock_page(page); | |
1006 | page_cache_release(page); | |
1007 | goto again; | |
1008 | } | |
600a45e1 MX |
1009 | } |
1010 | ||
4cb5300b CM |
1011 | if (!PageUptodate(page)) { |
1012 | btrfs_readpage(NULL, page); | |
1013 | lock_page(page); | |
1014 | if (!PageUptodate(page)) { | |
1015 | unlock_page(page); | |
1016 | page_cache_release(page); | |
1017 | ret = -EIO; | |
1018 | break; | |
1019 | } | |
1020 | } | |
600a45e1 | 1021 | |
600a45e1 MX |
1022 | if (page->mapping != inode->i_mapping) { |
1023 | unlock_page(page); | |
1024 | page_cache_release(page); | |
1025 | goto again; | |
1026 | } | |
1027 | ||
4cb5300b CM |
1028 | pages[i] = page; |
1029 | i_done++; | |
1030 | } | |
1031 | if (!i_done || ret) | |
1032 | goto out; | |
1033 | ||
1034 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
1035 | goto out; | |
1036 | ||
1037 | /* | |
1038 | * so now we have a nice long stream of locked | |
1039 | * and up to date pages, lets wait on them | |
1040 | */ | |
1041 | for (i = 0; i < i_done; i++) | |
1042 | wait_on_page_writeback(pages[i]); | |
1043 | ||
1044 | page_start = page_offset(pages[0]); | |
1045 | page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; | |
1046 | ||
1047 | lock_extent_bits(&BTRFS_I(inode)->io_tree, | |
d0082371 | 1048 | page_start, page_end - 1, 0, &cached_state); |
4cb5300b CM |
1049 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, |
1050 | page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | | |
9e8a4a8b LB |
1051 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, |
1052 | &cached_state, GFP_NOFS); | |
4cb5300b | 1053 | |
1f12bd06 | 1054 | if (i_done != page_cnt) { |
9e0baf60 JB |
1055 | spin_lock(&BTRFS_I(inode)->lock); |
1056 | BTRFS_I(inode)->outstanding_extents++; | |
1057 | spin_unlock(&BTRFS_I(inode)->lock); | |
4cb5300b | 1058 | btrfs_delalloc_release_space(inode, |
1f12bd06 | 1059 | (page_cnt - i_done) << PAGE_CACHE_SHIFT); |
4cb5300b CM |
1060 | } |
1061 | ||
1062 | ||
9e8a4a8b LB |
1063 | set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, |
1064 | &cached_state, GFP_NOFS); | |
4cb5300b CM |
1065 | |
1066 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, | |
1067 | page_start, page_end - 1, &cached_state, | |
1068 | GFP_NOFS); | |
1069 | ||
1070 | for (i = 0; i < i_done; i++) { | |
1071 | clear_page_dirty_for_io(pages[i]); | |
1072 | ClearPageChecked(pages[i]); | |
1073 | set_page_extent_mapped(pages[i]); | |
1074 | set_page_dirty(pages[i]); | |
1075 | unlock_page(pages[i]); | |
1076 | page_cache_release(pages[i]); | |
1077 | } | |
1078 | return i_done; | |
1079 | out: | |
1080 | for (i = 0; i < i_done; i++) { | |
1081 | unlock_page(pages[i]); | |
1082 | page_cache_release(pages[i]); | |
1083 | } | |
1f12bd06 | 1084 | btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); |
4cb5300b CM |
1085 | return ret; |
1086 | ||
1087 | } | |
1088 | ||
1089 | int btrfs_defrag_file(struct inode *inode, struct file *file, | |
1090 | struct btrfs_ioctl_defrag_range_args *range, | |
1091 | u64 newer_than, unsigned long max_to_defrag) | |
1092 | { | |
1093 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4cb5300b | 1094 | struct file_ra_state *ra = NULL; |
f46b5a66 | 1095 | unsigned long last_index; |
151a31b2 | 1096 | u64 isize = i_size_read(inode); |
940100a4 CM |
1097 | u64 last_len = 0; |
1098 | u64 skip = 0; | |
1099 | u64 defrag_end = 0; | |
4cb5300b | 1100 | u64 newer_off = range->start; |
f46b5a66 | 1101 | unsigned long i; |
008873ea | 1102 | unsigned long ra_index = 0; |
f46b5a66 | 1103 | int ret; |
4cb5300b | 1104 | int defrag_count = 0; |
1a419d85 | 1105 | int compress_type = BTRFS_COMPRESS_ZLIB; |
4cb5300b | 1106 | int extent_thresh = range->extent_thresh; |
008873ea LZ |
1107 | int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; |
1108 | int cluster = max_cluster; | |
4cb5300b CM |
1109 | u64 new_align = ~((u64)128 * 1024 - 1); |
1110 | struct page **pages = NULL; | |
1111 | ||
1112 | if (extent_thresh == 0) | |
1113 | extent_thresh = 256 * 1024; | |
1a419d85 LZ |
1114 | |
1115 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { | |
1116 | if (range->compress_type > BTRFS_COMPRESS_TYPES) | |
1117 | return -EINVAL; | |
1118 | if (range->compress_type) | |
1119 | compress_type = range->compress_type; | |
1120 | } | |
f46b5a66 | 1121 | |
151a31b2 | 1122 | if (isize == 0) |
940100a4 CM |
1123 | return 0; |
1124 | ||
4cb5300b CM |
1125 | /* |
1126 | * if we were not given a file, allocate a readahead | |
1127 | * context | |
1128 | */ | |
1129 | if (!file) { | |
1130 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
1131 | if (!ra) | |
1132 | return -ENOMEM; | |
1133 | file_ra_state_init(ra, inode->i_mapping); | |
1134 | } else { | |
1135 | ra = &file->f_ra; | |
1136 | } | |
1137 | ||
008873ea | 1138 | pages = kmalloc(sizeof(struct page *) * max_cluster, |
4cb5300b CM |
1139 | GFP_NOFS); |
1140 | if (!pages) { | |
1141 | ret = -ENOMEM; | |
1142 | goto out_ra; | |
1143 | } | |
1144 | ||
1145 | /* find the last page to defrag */ | |
1e701a32 | 1146 | if (range->start + range->len > range->start) { |
151a31b2 | 1147 | last_index = min_t(u64, isize - 1, |
1e701a32 CM |
1148 | range->start + range->len - 1) >> PAGE_CACHE_SHIFT; |
1149 | } else { | |
151a31b2 | 1150 | last_index = (isize - 1) >> PAGE_CACHE_SHIFT; |
1e701a32 CM |
1151 | } |
1152 | ||
4cb5300b CM |
1153 | if (newer_than) { |
1154 | ret = find_new_extents(root, inode, newer_than, | |
1155 | &newer_off, 64 * 1024); | |
1156 | if (!ret) { | |
1157 | range->start = newer_off; | |
1158 | /* | |
1159 | * we always align our defrag to help keep | |
1160 | * the extents in the file evenly spaced | |
1161 | */ | |
1162 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; | |
4cb5300b CM |
1163 | } else |
1164 | goto out_ra; | |
1165 | } else { | |
1166 | i = range->start >> PAGE_CACHE_SHIFT; | |
1167 | } | |
1168 | if (!max_to_defrag) | |
7ec31b54 | 1169 | max_to_defrag = last_index + 1; |
4cb5300b | 1170 | |
2a0f7f57 LZ |
1171 | /* |
1172 | * make writeback starts from i, so the defrag range can be | |
1173 | * written sequentially. | |
1174 | */ | |
1175 | if (i < inode->i_mapping->writeback_index) | |
1176 | inode->i_mapping->writeback_index = i; | |
1177 | ||
f7f43cc8 CM |
1178 | while (i <= last_index && defrag_count < max_to_defrag && |
1179 | (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> | |
1180 | PAGE_CACHE_SHIFT)) { | |
4cb5300b CM |
1181 | /* |
1182 | * make sure we stop running if someone unmounts | |
1183 | * the FS | |
1184 | */ | |
1185 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
1186 | break; | |
1187 | ||
66c26892 | 1188 | if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, |
6c282eb4 | 1189 | extent_thresh, &last_len, &skip, |
a43a2111 AM |
1190 | &defrag_end, range->flags & |
1191 | BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
940100a4 CM |
1192 | unsigned long next; |
1193 | /* | |
1194 | * the should_defrag function tells us how much to skip | |
1195 | * bump our counter by the suggested amount | |
1196 | */ | |
1197 | next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
1198 | i = max(i + 1, next); | |
1199 | continue; | |
1200 | } | |
008873ea LZ |
1201 | |
1202 | if (!newer_than) { | |
1203 | cluster = (PAGE_CACHE_ALIGN(defrag_end) >> | |
1204 | PAGE_CACHE_SHIFT) - i; | |
1205 | cluster = min(cluster, max_cluster); | |
1206 | } else { | |
1207 | cluster = max_cluster; | |
1208 | } | |
1209 | ||
1e701a32 | 1210 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) |
1a419d85 | 1211 | BTRFS_I(inode)->force_compress = compress_type; |
940100a4 | 1212 | |
008873ea LZ |
1213 | if (i + cluster > ra_index) { |
1214 | ra_index = max(i, ra_index); | |
1215 | btrfs_force_ra(inode->i_mapping, ra, file, ra_index, | |
1216 | cluster); | |
1217 | ra_index += max_cluster; | |
1218 | } | |
940100a4 | 1219 | |
ecb8bea8 | 1220 | mutex_lock(&inode->i_mutex); |
008873ea | 1221 | ret = cluster_pages_for_defrag(inode, pages, i, cluster); |
ecb8bea8 LB |
1222 | if (ret < 0) { |
1223 | mutex_unlock(&inode->i_mutex); | |
4cb5300b | 1224 | goto out_ra; |
ecb8bea8 | 1225 | } |
4cb5300b CM |
1226 | |
1227 | defrag_count += ret; | |
1228 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, ret); | |
ecb8bea8 | 1229 | mutex_unlock(&inode->i_mutex); |
4cb5300b CM |
1230 | |
1231 | if (newer_than) { | |
1232 | if (newer_off == (u64)-1) | |
1233 | break; | |
1234 | ||
e1f041e1 LB |
1235 | if (ret > 0) |
1236 | i += ret; | |
1237 | ||
4cb5300b CM |
1238 | newer_off = max(newer_off + 1, |
1239 | (u64)i << PAGE_CACHE_SHIFT); | |
1240 | ||
1241 | ret = find_new_extents(root, inode, | |
1242 | newer_than, &newer_off, | |
1243 | 64 * 1024); | |
1244 | if (!ret) { | |
1245 | range->start = newer_off; | |
1246 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; | |
4cb5300b CM |
1247 | } else { |
1248 | break; | |
f46b5a66 | 1249 | } |
4cb5300b | 1250 | } else { |
008873ea | 1251 | if (ret > 0) { |
cbcc8326 | 1252 | i += ret; |
008873ea LZ |
1253 | last_len += ret << PAGE_CACHE_SHIFT; |
1254 | } else { | |
cbcc8326 | 1255 | i++; |
008873ea LZ |
1256 | last_len = 0; |
1257 | } | |
f46b5a66 | 1258 | } |
f46b5a66 CH |
1259 | } |
1260 | ||
1e701a32 CM |
1261 | if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) |
1262 | filemap_flush(inode->i_mapping); | |
1263 | ||
1264 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
1265 | /* the filemap_flush will queue IO into the worker threads, but | |
1266 | * we have to make sure the IO is actually started and that | |
1267 | * ordered extents get created before we return | |
1268 | */ | |
1269 | atomic_inc(&root->fs_info->async_submit_draining); | |
1270 | while (atomic_read(&root->fs_info->nr_async_submits) || | |
1271 | atomic_read(&root->fs_info->async_delalloc_pages)) { | |
1272 | wait_event(root->fs_info->async_submit_wait, | |
1273 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && | |
1274 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); | |
1275 | } | |
1276 | atomic_dec(&root->fs_info->async_submit_draining); | |
1277 | ||
1278 | mutex_lock(&inode->i_mutex); | |
261507a0 | 1279 | BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; |
1e701a32 CM |
1280 | mutex_unlock(&inode->i_mutex); |
1281 | } | |
1282 | ||
1a419d85 | 1283 | if (range->compress_type == BTRFS_COMPRESS_LZO) { |
2b0ce2c2 | 1284 | btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); |
1a419d85 LZ |
1285 | } |
1286 | ||
60ccf82f | 1287 | ret = defrag_count; |
940100a4 | 1288 | |
4cb5300b CM |
1289 | out_ra: |
1290 | if (!file) | |
1291 | kfree(ra); | |
1292 | kfree(pages); | |
940100a4 | 1293 | return ret; |
f46b5a66 CH |
1294 | } |
1295 | ||
76dda93c YZ |
1296 | static noinline int btrfs_ioctl_resize(struct btrfs_root *root, |
1297 | void __user *arg) | |
f46b5a66 CH |
1298 | { |
1299 | u64 new_size; | |
1300 | u64 old_size; | |
1301 | u64 devid = 1; | |
1302 | struct btrfs_ioctl_vol_args *vol_args; | |
1303 | struct btrfs_trans_handle *trans; | |
1304 | struct btrfs_device *device = NULL; | |
1305 | char *sizestr; | |
1306 | char *devstr = NULL; | |
1307 | int ret = 0; | |
f46b5a66 CH |
1308 | int mod = 0; |
1309 | ||
c146afad YZ |
1310 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
1311 | return -EROFS; | |
1312 | ||
e441d54d CM |
1313 | if (!capable(CAP_SYS_ADMIN)) |
1314 | return -EPERM; | |
1315 | ||
c9e9f97b ID |
1316 | mutex_lock(&root->fs_info->volume_mutex); |
1317 | if (root->fs_info->balance_ctl) { | |
1318 | printk(KERN_INFO "btrfs: balance in progress\n"); | |
1319 | ret = -EINVAL; | |
1320 | goto out; | |
1321 | } | |
1322 | ||
dae7b665 | 1323 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
1324 | if (IS_ERR(vol_args)) { |
1325 | ret = PTR_ERR(vol_args); | |
1326 | goto out; | |
1327 | } | |
5516e595 MF |
1328 | |
1329 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 1330 | |
f46b5a66 CH |
1331 | sizestr = vol_args->name; |
1332 | devstr = strchr(sizestr, ':'); | |
1333 | if (devstr) { | |
1334 | char *end; | |
1335 | sizestr = devstr + 1; | |
1336 | *devstr = '\0'; | |
1337 | devstr = vol_args->name; | |
1338 | devid = simple_strtoull(devstr, &end, 10); | |
5bb14682 | 1339 | printk(KERN_INFO "btrfs: resizing devid %llu\n", |
21380931 | 1340 | (unsigned long long)devid); |
f46b5a66 | 1341 | } |
2b82032c | 1342 | device = btrfs_find_device(root, devid, NULL, NULL); |
f46b5a66 | 1343 | if (!device) { |
5bb14682 | 1344 | printk(KERN_INFO "btrfs: resizer unable to find device %llu\n", |
21380931 | 1345 | (unsigned long long)devid); |
f46b5a66 | 1346 | ret = -EINVAL; |
c9e9f97b | 1347 | goto out_free; |
f46b5a66 | 1348 | } |
4e42ae1b LB |
1349 | if (device->fs_devices && device->fs_devices->seeding) { |
1350 | printk(KERN_INFO "btrfs: resizer unable to apply on " | |
a8c4a33b CM |
1351 | "seeding device %llu\n", |
1352 | (unsigned long long)devid); | |
4e42ae1b LB |
1353 | ret = -EINVAL; |
1354 | goto out_free; | |
1355 | } | |
1356 | ||
f46b5a66 CH |
1357 | if (!strcmp(sizestr, "max")) |
1358 | new_size = device->bdev->bd_inode->i_size; | |
1359 | else { | |
1360 | if (sizestr[0] == '-') { | |
1361 | mod = -1; | |
1362 | sizestr++; | |
1363 | } else if (sizestr[0] == '+') { | |
1364 | mod = 1; | |
1365 | sizestr++; | |
1366 | } | |
91748467 | 1367 | new_size = memparse(sizestr, NULL); |
f46b5a66 CH |
1368 | if (new_size == 0) { |
1369 | ret = -EINVAL; | |
c9e9f97b | 1370 | goto out_free; |
f46b5a66 CH |
1371 | } |
1372 | } | |
1373 | ||
1374 | old_size = device->total_bytes; | |
1375 | ||
1376 | if (mod < 0) { | |
1377 | if (new_size > old_size) { | |
1378 | ret = -EINVAL; | |
c9e9f97b | 1379 | goto out_free; |
f46b5a66 CH |
1380 | } |
1381 | new_size = old_size - new_size; | |
1382 | } else if (mod > 0) { | |
1383 | new_size = old_size + new_size; | |
1384 | } | |
1385 | ||
1386 | if (new_size < 256 * 1024 * 1024) { | |
1387 | ret = -EINVAL; | |
c9e9f97b | 1388 | goto out_free; |
f46b5a66 CH |
1389 | } |
1390 | if (new_size > device->bdev->bd_inode->i_size) { | |
1391 | ret = -EFBIG; | |
c9e9f97b | 1392 | goto out_free; |
f46b5a66 CH |
1393 | } |
1394 | ||
1395 | do_div(new_size, root->sectorsize); | |
1396 | new_size *= root->sectorsize; | |
1397 | ||
606686ee JB |
1398 | printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n", |
1399 | rcu_str_deref(device->name), | |
1400 | (unsigned long long)new_size); | |
f46b5a66 CH |
1401 | |
1402 | if (new_size > old_size) { | |
a22285a6 | 1403 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1404 | if (IS_ERR(trans)) { |
1405 | ret = PTR_ERR(trans); | |
c9e9f97b | 1406 | goto out_free; |
98d5dc13 | 1407 | } |
f46b5a66 CH |
1408 | ret = btrfs_grow_device(trans, device, new_size); |
1409 | btrfs_commit_transaction(trans, root); | |
ece7d20e | 1410 | } else if (new_size < old_size) { |
f46b5a66 CH |
1411 | ret = btrfs_shrink_device(device, new_size); |
1412 | } | |
1413 | ||
c9e9f97b | 1414 | out_free: |
f46b5a66 | 1415 | kfree(vol_args); |
c9e9f97b ID |
1416 | out: |
1417 | mutex_unlock(&root->fs_info->volume_mutex); | |
f46b5a66 CH |
1418 | return ret; |
1419 | } | |
1420 | ||
72fd032e | 1421 | static noinline int btrfs_ioctl_snap_create_transid(struct file *file, |
6f72c7e2 AJ |
1422 | char *name, unsigned long fd, int subvol, |
1423 | u64 *transid, bool readonly, | |
1424 | struct btrfs_qgroup_inherit **inherit) | |
f46b5a66 | 1425 | { |
f46b5a66 | 1426 | int namelen; |
3de4586c | 1427 | int ret = 0; |
f46b5a66 | 1428 | |
a874a63e LB |
1429 | ret = mnt_want_write_file(file); |
1430 | if (ret) | |
1431 | goto out; | |
1432 | ||
72fd032e SW |
1433 | namelen = strlen(name); |
1434 | if (strchr(name, '/')) { | |
f46b5a66 | 1435 | ret = -EINVAL; |
a874a63e | 1436 | goto out_drop_write; |
f46b5a66 CH |
1437 | } |
1438 | ||
16780cab CM |
1439 | if (name[0] == '.' && |
1440 | (namelen == 1 || (name[1] == '.' && namelen == 2))) { | |
1441 | ret = -EEXIST; | |
a874a63e | 1442 | goto out_drop_write; |
16780cab CM |
1443 | } |
1444 | ||
3de4586c | 1445 | if (subvol) { |
72fd032e | 1446 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
6f72c7e2 | 1447 | NULL, transid, readonly, inherit); |
cb8e7090 | 1448 | } else { |
2903ff01 | 1449 | struct fd src = fdget(fd); |
3de4586c | 1450 | struct inode *src_inode; |
2903ff01 | 1451 | if (!src.file) { |
3de4586c | 1452 | ret = -EINVAL; |
a874a63e | 1453 | goto out_drop_write; |
3de4586c CM |
1454 | } |
1455 | ||
2903ff01 | 1456 | src_inode = src.file->f_path.dentry->d_inode; |
3de4586c | 1457 | if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { |
d397712b CM |
1458 | printk(KERN_INFO "btrfs: Snapshot src from " |
1459 | "another FS\n"); | |
3de4586c | 1460 | ret = -EINVAL; |
ecd18815 AV |
1461 | } else { |
1462 | ret = btrfs_mksubvol(&file->f_path, name, namelen, | |
1463 | BTRFS_I(src_inode)->root, | |
1464 | transid, readonly, inherit); | |
3de4586c | 1465 | } |
2903ff01 | 1466 | fdput(src); |
cb8e7090 | 1467 | } |
a874a63e LB |
1468 | out_drop_write: |
1469 | mnt_drop_write_file(file); | |
f46b5a66 | 1470 | out: |
72fd032e SW |
1471 | return ret; |
1472 | } | |
1473 | ||
1474 | static noinline int btrfs_ioctl_snap_create(struct file *file, | |
fa0d2b9b | 1475 | void __user *arg, int subvol) |
72fd032e | 1476 | { |
fa0d2b9b | 1477 | struct btrfs_ioctl_vol_args *vol_args; |
72fd032e SW |
1478 | int ret; |
1479 | ||
fa0d2b9b LZ |
1480 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1481 | if (IS_ERR(vol_args)) | |
1482 | return PTR_ERR(vol_args); | |
1483 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
72fd032e | 1484 | |
fa0d2b9b | 1485 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, |
b83cc969 | 1486 | vol_args->fd, subvol, |
6f72c7e2 | 1487 | NULL, false, NULL); |
fdfb1e4f | 1488 | |
fa0d2b9b LZ |
1489 | kfree(vol_args); |
1490 | return ret; | |
1491 | } | |
fdfb1e4f | 1492 | |
fa0d2b9b LZ |
1493 | static noinline int btrfs_ioctl_snap_create_v2(struct file *file, |
1494 | void __user *arg, int subvol) | |
1495 | { | |
1496 | struct btrfs_ioctl_vol_args_v2 *vol_args; | |
1497 | int ret; | |
1498 | u64 transid = 0; | |
1499 | u64 *ptr = NULL; | |
b83cc969 | 1500 | bool readonly = false; |
6f72c7e2 | 1501 | struct btrfs_qgroup_inherit *inherit = NULL; |
75eaa0e2 | 1502 | |
fa0d2b9b LZ |
1503 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1504 | if (IS_ERR(vol_args)) | |
1505 | return PTR_ERR(vol_args); | |
1506 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; | |
75eaa0e2 | 1507 | |
b83cc969 | 1508 | if (vol_args->flags & |
6f72c7e2 AJ |
1509 | ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | |
1510 | BTRFS_SUBVOL_QGROUP_INHERIT)) { | |
b83cc969 | 1511 | ret = -EOPNOTSUPP; |
fa0d2b9b | 1512 | goto out; |
72fd032e | 1513 | } |
fa0d2b9b LZ |
1514 | |
1515 | if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) | |
1516 | ptr = &transid; | |
b83cc969 LZ |
1517 | if (vol_args->flags & BTRFS_SUBVOL_RDONLY) |
1518 | readonly = true; | |
6f72c7e2 AJ |
1519 | if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { |
1520 | if (vol_args->size > PAGE_CACHE_SIZE) { | |
1521 | ret = -EINVAL; | |
1522 | goto out; | |
1523 | } | |
1524 | inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); | |
1525 | if (IS_ERR(inherit)) { | |
1526 | ret = PTR_ERR(inherit); | |
1527 | goto out; | |
1528 | } | |
1529 | } | |
fa0d2b9b LZ |
1530 | |
1531 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, | |
6f72c7e2 AJ |
1532 | vol_args->fd, subvol, ptr, |
1533 | readonly, &inherit); | |
fa0d2b9b LZ |
1534 | |
1535 | if (ret == 0 && ptr && | |
1536 | copy_to_user(arg + | |
1537 | offsetof(struct btrfs_ioctl_vol_args_v2, | |
1538 | transid), ptr, sizeof(*ptr))) | |
1539 | ret = -EFAULT; | |
fdfb1e4f | 1540 | out: |
f46b5a66 | 1541 | kfree(vol_args); |
6f72c7e2 | 1542 | kfree(inherit); |
f46b5a66 CH |
1543 | return ret; |
1544 | } | |
1545 | ||
0caa102d LZ |
1546 | static noinline int btrfs_ioctl_subvol_getflags(struct file *file, |
1547 | void __user *arg) | |
1548 | { | |
1549 | struct inode *inode = fdentry(file)->d_inode; | |
1550 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1551 | int ret = 0; | |
1552 | u64 flags = 0; | |
1553 | ||
33345d01 | 1554 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) |
0caa102d LZ |
1555 | return -EINVAL; |
1556 | ||
1557 | down_read(&root->fs_info->subvol_sem); | |
1558 | if (btrfs_root_readonly(root)) | |
1559 | flags |= BTRFS_SUBVOL_RDONLY; | |
1560 | up_read(&root->fs_info->subvol_sem); | |
1561 | ||
1562 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
1563 | ret = -EFAULT; | |
1564 | ||
1565 | return ret; | |
1566 | } | |
1567 | ||
1568 | static noinline int btrfs_ioctl_subvol_setflags(struct file *file, | |
1569 | void __user *arg) | |
1570 | { | |
1571 | struct inode *inode = fdentry(file)->d_inode; | |
1572 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1573 | struct btrfs_trans_handle *trans; | |
1574 | u64 root_flags; | |
1575 | u64 flags; | |
1576 | int ret = 0; | |
1577 | ||
b9ca0664 LB |
1578 | ret = mnt_want_write_file(file); |
1579 | if (ret) | |
1580 | goto out; | |
0caa102d | 1581 | |
b9ca0664 LB |
1582 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
1583 | ret = -EINVAL; | |
1584 | goto out_drop_write; | |
1585 | } | |
0caa102d | 1586 | |
b9ca0664 LB |
1587 | if (copy_from_user(&flags, arg, sizeof(flags))) { |
1588 | ret = -EFAULT; | |
1589 | goto out_drop_write; | |
1590 | } | |
0caa102d | 1591 | |
b9ca0664 LB |
1592 | if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { |
1593 | ret = -EINVAL; | |
1594 | goto out_drop_write; | |
1595 | } | |
0caa102d | 1596 | |
b9ca0664 LB |
1597 | if (flags & ~BTRFS_SUBVOL_RDONLY) { |
1598 | ret = -EOPNOTSUPP; | |
1599 | goto out_drop_write; | |
1600 | } | |
0caa102d | 1601 | |
b9ca0664 LB |
1602 | if (!inode_owner_or_capable(inode)) { |
1603 | ret = -EACCES; | |
1604 | goto out_drop_write; | |
1605 | } | |
b4dc2b8c | 1606 | |
0caa102d LZ |
1607 | down_write(&root->fs_info->subvol_sem); |
1608 | ||
1609 | /* nothing to do */ | |
1610 | if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) | |
b9ca0664 | 1611 | goto out_drop_sem; |
0caa102d LZ |
1612 | |
1613 | root_flags = btrfs_root_flags(&root->root_item); | |
1614 | if (flags & BTRFS_SUBVOL_RDONLY) | |
1615 | btrfs_set_root_flags(&root->root_item, | |
1616 | root_flags | BTRFS_ROOT_SUBVOL_RDONLY); | |
1617 | else | |
1618 | btrfs_set_root_flags(&root->root_item, | |
1619 | root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); | |
1620 | ||
1621 | trans = btrfs_start_transaction(root, 1); | |
1622 | if (IS_ERR(trans)) { | |
1623 | ret = PTR_ERR(trans); | |
1624 | goto out_reset; | |
1625 | } | |
1626 | ||
b4dc2b8c | 1627 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
0caa102d LZ |
1628 | &root->root_key, &root->root_item); |
1629 | ||
1630 | btrfs_commit_transaction(trans, root); | |
1631 | out_reset: | |
1632 | if (ret) | |
1633 | btrfs_set_root_flags(&root->root_item, root_flags); | |
b9ca0664 | 1634 | out_drop_sem: |
0caa102d | 1635 | up_write(&root->fs_info->subvol_sem); |
b9ca0664 LB |
1636 | out_drop_write: |
1637 | mnt_drop_write_file(file); | |
1638 | out: | |
0caa102d LZ |
1639 | return ret; |
1640 | } | |
1641 | ||
76dda93c YZ |
1642 | /* |
1643 | * helper to check if the subvolume references other subvolumes | |
1644 | */ | |
1645 | static noinline int may_destroy_subvol(struct btrfs_root *root) | |
1646 | { | |
1647 | struct btrfs_path *path; | |
1648 | struct btrfs_key key; | |
1649 | int ret; | |
1650 | ||
1651 | path = btrfs_alloc_path(); | |
1652 | if (!path) | |
1653 | return -ENOMEM; | |
1654 | ||
1655 | key.objectid = root->root_key.objectid; | |
1656 | key.type = BTRFS_ROOT_REF_KEY; | |
1657 | key.offset = (u64)-1; | |
1658 | ||
1659 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, | |
1660 | &key, path, 0, 0); | |
1661 | if (ret < 0) | |
1662 | goto out; | |
1663 | BUG_ON(ret == 0); | |
1664 | ||
1665 | ret = 0; | |
1666 | if (path->slots[0] > 0) { | |
1667 | path->slots[0]--; | |
1668 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1669 | if (key.objectid == root->root_key.objectid && | |
1670 | key.type == BTRFS_ROOT_REF_KEY) | |
1671 | ret = -ENOTEMPTY; | |
1672 | } | |
1673 | out: | |
1674 | btrfs_free_path(path); | |
1675 | return ret; | |
1676 | } | |
1677 | ||
ac8e9819 CM |
1678 | static noinline int key_in_sk(struct btrfs_key *key, |
1679 | struct btrfs_ioctl_search_key *sk) | |
1680 | { | |
abc6e134 CM |
1681 | struct btrfs_key test; |
1682 | int ret; | |
1683 | ||
1684 | test.objectid = sk->min_objectid; | |
1685 | test.type = sk->min_type; | |
1686 | test.offset = sk->min_offset; | |
1687 | ||
1688 | ret = btrfs_comp_cpu_keys(key, &test); | |
1689 | if (ret < 0) | |
ac8e9819 | 1690 | return 0; |
abc6e134 CM |
1691 | |
1692 | test.objectid = sk->max_objectid; | |
1693 | test.type = sk->max_type; | |
1694 | test.offset = sk->max_offset; | |
1695 | ||
1696 | ret = btrfs_comp_cpu_keys(key, &test); | |
1697 | if (ret > 0) | |
ac8e9819 CM |
1698 | return 0; |
1699 | return 1; | |
1700 | } | |
1701 | ||
1702 | static noinline int copy_to_sk(struct btrfs_root *root, | |
1703 | struct btrfs_path *path, | |
1704 | struct btrfs_key *key, | |
1705 | struct btrfs_ioctl_search_key *sk, | |
1706 | char *buf, | |
1707 | unsigned long *sk_offset, | |
1708 | int *num_found) | |
1709 | { | |
1710 | u64 found_transid; | |
1711 | struct extent_buffer *leaf; | |
1712 | struct btrfs_ioctl_search_header sh; | |
1713 | unsigned long item_off; | |
1714 | unsigned long item_len; | |
1715 | int nritems; | |
1716 | int i; | |
1717 | int slot; | |
ac8e9819 CM |
1718 | int ret = 0; |
1719 | ||
1720 | leaf = path->nodes[0]; | |
1721 | slot = path->slots[0]; | |
1722 | nritems = btrfs_header_nritems(leaf); | |
1723 | ||
1724 | if (btrfs_header_generation(leaf) > sk->max_transid) { | |
1725 | i = nritems; | |
1726 | goto advance_key; | |
1727 | } | |
1728 | found_transid = btrfs_header_generation(leaf); | |
1729 | ||
1730 | for (i = slot; i < nritems; i++) { | |
1731 | item_off = btrfs_item_ptr_offset(leaf, i); | |
1732 | item_len = btrfs_item_size_nr(leaf, i); | |
1733 | ||
1734 | if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) | |
1735 | item_len = 0; | |
1736 | ||
1737 | if (sizeof(sh) + item_len + *sk_offset > | |
1738 | BTRFS_SEARCH_ARGS_BUFSIZE) { | |
1739 | ret = 1; | |
1740 | goto overflow; | |
1741 | } | |
1742 | ||
1743 | btrfs_item_key_to_cpu(leaf, key, i); | |
1744 | if (!key_in_sk(key, sk)) | |
1745 | continue; | |
1746 | ||
1747 | sh.objectid = key->objectid; | |
1748 | sh.offset = key->offset; | |
1749 | sh.type = key->type; | |
1750 | sh.len = item_len; | |
1751 | sh.transid = found_transid; | |
1752 | ||
1753 | /* copy search result header */ | |
1754 | memcpy(buf + *sk_offset, &sh, sizeof(sh)); | |
1755 | *sk_offset += sizeof(sh); | |
1756 | ||
1757 | if (item_len) { | |
1758 | char *p = buf + *sk_offset; | |
1759 | /* copy the item */ | |
1760 | read_extent_buffer(leaf, p, | |
1761 | item_off, item_len); | |
1762 | *sk_offset += item_len; | |
ac8e9819 | 1763 | } |
e2156867 | 1764 | (*num_found)++; |
ac8e9819 CM |
1765 | |
1766 | if (*num_found >= sk->nr_items) | |
1767 | break; | |
1768 | } | |
1769 | advance_key: | |
abc6e134 CM |
1770 | ret = 0; |
1771 | if (key->offset < (u64)-1 && key->offset < sk->max_offset) | |
ac8e9819 | 1772 | key->offset++; |
abc6e134 CM |
1773 | else if (key->type < (u8)-1 && key->type < sk->max_type) { |
1774 | key->offset = 0; | |
ac8e9819 | 1775 | key->type++; |
abc6e134 CM |
1776 | } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { |
1777 | key->offset = 0; | |
1778 | key->type = 0; | |
ac8e9819 | 1779 | key->objectid++; |
abc6e134 CM |
1780 | } else |
1781 | ret = 1; | |
ac8e9819 | 1782 | overflow: |
ac8e9819 CM |
1783 | return ret; |
1784 | } | |
1785 | ||
1786 | static noinline int search_ioctl(struct inode *inode, | |
1787 | struct btrfs_ioctl_search_args *args) | |
1788 | { | |
1789 | struct btrfs_root *root; | |
1790 | struct btrfs_key key; | |
1791 | struct btrfs_key max_key; | |
1792 | struct btrfs_path *path; | |
1793 | struct btrfs_ioctl_search_key *sk = &args->key; | |
1794 | struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; | |
1795 | int ret; | |
1796 | int num_found = 0; | |
1797 | unsigned long sk_offset = 0; | |
1798 | ||
1799 | path = btrfs_alloc_path(); | |
1800 | if (!path) | |
1801 | return -ENOMEM; | |
1802 | ||
1803 | if (sk->tree_id == 0) { | |
1804 | /* search the root of the inode that was passed */ | |
1805 | root = BTRFS_I(inode)->root; | |
1806 | } else { | |
1807 | key.objectid = sk->tree_id; | |
1808 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1809 | key.offset = (u64)-1; | |
1810 | root = btrfs_read_fs_root_no_name(info, &key); | |
1811 | if (IS_ERR(root)) { | |
1812 | printk(KERN_ERR "could not find root %llu\n", | |
1813 | sk->tree_id); | |
1814 | btrfs_free_path(path); | |
1815 | return -ENOENT; | |
1816 | } | |
1817 | } | |
1818 | ||
1819 | key.objectid = sk->min_objectid; | |
1820 | key.type = sk->min_type; | |
1821 | key.offset = sk->min_offset; | |
1822 | ||
1823 | max_key.objectid = sk->max_objectid; | |
1824 | max_key.type = sk->max_type; | |
1825 | max_key.offset = sk->max_offset; | |
1826 | ||
1827 | path->keep_locks = 1; | |
1828 | ||
1829 | while(1) { | |
1830 | ret = btrfs_search_forward(root, &key, &max_key, path, 0, | |
1831 | sk->min_transid); | |
1832 | if (ret != 0) { | |
1833 | if (ret > 0) | |
1834 | ret = 0; | |
1835 | goto err; | |
1836 | } | |
1837 | ret = copy_to_sk(root, path, &key, sk, args->buf, | |
1838 | &sk_offset, &num_found); | |
b3b4aa74 | 1839 | btrfs_release_path(path); |
ac8e9819 CM |
1840 | if (ret || num_found >= sk->nr_items) |
1841 | break; | |
1842 | ||
1843 | } | |
1844 | ret = 0; | |
1845 | err: | |
1846 | sk->nr_items = num_found; | |
1847 | btrfs_free_path(path); | |
1848 | return ret; | |
1849 | } | |
1850 | ||
1851 | static noinline int btrfs_ioctl_tree_search(struct file *file, | |
1852 | void __user *argp) | |
1853 | { | |
1854 | struct btrfs_ioctl_search_args *args; | |
1855 | struct inode *inode; | |
1856 | int ret; | |
1857 | ||
1858 | if (!capable(CAP_SYS_ADMIN)) | |
1859 | return -EPERM; | |
1860 | ||
2354d08f JL |
1861 | args = memdup_user(argp, sizeof(*args)); |
1862 | if (IS_ERR(args)) | |
1863 | return PTR_ERR(args); | |
ac8e9819 | 1864 | |
ac8e9819 CM |
1865 | inode = fdentry(file)->d_inode; |
1866 | ret = search_ioctl(inode, args); | |
1867 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
1868 | ret = -EFAULT; | |
1869 | kfree(args); | |
1870 | return ret; | |
1871 | } | |
1872 | ||
98d377a0 | 1873 | /* |
ac8e9819 CM |
1874 | * Search INODE_REFs to identify path name of 'dirid' directory |
1875 | * in a 'tree_id' tree. and sets path name to 'name'. | |
1876 | */ | |
98d377a0 TH |
1877 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
1878 | u64 tree_id, u64 dirid, char *name) | |
1879 | { | |
1880 | struct btrfs_root *root; | |
1881 | struct btrfs_key key; | |
ac8e9819 | 1882 | char *ptr; |
98d377a0 TH |
1883 | int ret = -1; |
1884 | int slot; | |
1885 | int len; | |
1886 | int total_len = 0; | |
1887 | struct btrfs_inode_ref *iref; | |
1888 | struct extent_buffer *l; | |
1889 | struct btrfs_path *path; | |
1890 | ||
1891 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { | |
1892 | name[0]='\0'; | |
1893 | return 0; | |
1894 | } | |
1895 | ||
1896 | path = btrfs_alloc_path(); | |
1897 | if (!path) | |
1898 | return -ENOMEM; | |
1899 | ||
ac8e9819 | 1900 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; |
98d377a0 TH |
1901 | |
1902 | key.objectid = tree_id; | |
1903 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1904 | key.offset = (u64)-1; | |
1905 | root = btrfs_read_fs_root_no_name(info, &key); | |
1906 | if (IS_ERR(root)) { | |
1907 | printk(KERN_ERR "could not find root %llu\n", tree_id); | |
8ad6fcab CM |
1908 | ret = -ENOENT; |
1909 | goto out; | |
98d377a0 TH |
1910 | } |
1911 | ||
1912 | key.objectid = dirid; | |
1913 | key.type = BTRFS_INODE_REF_KEY; | |
8ad6fcab | 1914 | key.offset = (u64)-1; |
98d377a0 TH |
1915 | |
1916 | while(1) { | |
1917 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1918 | if (ret < 0) | |
1919 | goto out; | |
1920 | ||
1921 | l = path->nodes[0]; | |
1922 | slot = path->slots[0]; | |
8ad6fcab CM |
1923 | if (ret > 0 && slot > 0) |
1924 | slot--; | |
98d377a0 TH |
1925 | btrfs_item_key_to_cpu(l, &key, slot); |
1926 | ||
1927 | if (ret > 0 && (key.objectid != dirid || | |
ac8e9819 CM |
1928 | key.type != BTRFS_INODE_REF_KEY)) { |
1929 | ret = -ENOENT; | |
98d377a0 | 1930 | goto out; |
ac8e9819 | 1931 | } |
98d377a0 TH |
1932 | |
1933 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); | |
1934 | len = btrfs_inode_ref_name_len(l, iref); | |
1935 | ptr -= len + 1; | |
1936 | total_len += len + 1; | |
ac8e9819 | 1937 | if (ptr < name) |
98d377a0 TH |
1938 | goto out; |
1939 | ||
1940 | *(ptr + len) = '/'; | |
1941 | read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); | |
1942 | ||
1943 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) | |
1944 | break; | |
1945 | ||
b3b4aa74 | 1946 | btrfs_release_path(path); |
98d377a0 | 1947 | key.objectid = key.offset; |
8ad6fcab | 1948 | key.offset = (u64)-1; |
98d377a0 | 1949 | dirid = key.objectid; |
98d377a0 | 1950 | } |
ac8e9819 | 1951 | if (ptr < name) |
98d377a0 | 1952 | goto out; |
77906a50 | 1953 | memmove(name, ptr, total_len); |
98d377a0 TH |
1954 | name[total_len]='\0'; |
1955 | ret = 0; | |
1956 | out: | |
1957 | btrfs_free_path(path); | |
ac8e9819 CM |
1958 | return ret; |
1959 | } | |
1960 | ||
1961 | static noinline int btrfs_ioctl_ino_lookup(struct file *file, | |
1962 | void __user *argp) | |
1963 | { | |
1964 | struct btrfs_ioctl_ino_lookup_args *args; | |
1965 | struct inode *inode; | |
1966 | int ret; | |
1967 | ||
1968 | if (!capable(CAP_SYS_ADMIN)) | |
1969 | return -EPERM; | |
1970 | ||
2354d08f JL |
1971 | args = memdup_user(argp, sizeof(*args)); |
1972 | if (IS_ERR(args)) | |
1973 | return PTR_ERR(args); | |
c2b96929 | 1974 | |
ac8e9819 CM |
1975 | inode = fdentry(file)->d_inode; |
1976 | ||
1b53ac4d CM |
1977 | if (args->treeid == 0) |
1978 | args->treeid = BTRFS_I(inode)->root->root_key.objectid; | |
1979 | ||
ac8e9819 CM |
1980 | ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, |
1981 | args->treeid, args->objectid, | |
1982 | args->name); | |
1983 | ||
1984 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
1985 | ret = -EFAULT; | |
1986 | ||
1987 | kfree(args); | |
98d377a0 TH |
1988 | return ret; |
1989 | } | |
1990 | ||
76dda93c YZ |
1991 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
1992 | void __user *arg) | |
1993 | { | |
1994 | struct dentry *parent = fdentry(file); | |
1995 | struct dentry *dentry; | |
1996 | struct inode *dir = parent->d_inode; | |
1997 | struct inode *inode; | |
1998 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1999 | struct btrfs_root *dest = NULL; | |
2000 | struct btrfs_ioctl_vol_args *vol_args; | |
2001 | struct btrfs_trans_handle *trans; | |
2002 | int namelen; | |
2003 | int ret; | |
2004 | int err = 0; | |
2005 | ||
76dda93c YZ |
2006 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
2007 | if (IS_ERR(vol_args)) | |
2008 | return PTR_ERR(vol_args); | |
2009 | ||
2010 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
2011 | namelen = strlen(vol_args->name); | |
2012 | if (strchr(vol_args->name, '/') || | |
2013 | strncmp(vol_args->name, "..", namelen) == 0) { | |
2014 | err = -EINVAL; | |
2015 | goto out; | |
2016 | } | |
2017 | ||
a561be71 | 2018 | err = mnt_want_write_file(file); |
76dda93c YZ |
2019 | if (err) |
2020 | goto out; | |
2021 | ||
2022 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
2023 | dentry = lookup_one_len(vol_args->name, parent, namelen); | |
2024 | if (IS_ERR(dentry)) { | |
2025 | err = PTR_ERR(dentry); | |
2026 | goto out_unlock_dir; | |
2027 | } | |
2028 | ||
2029 | if (!dentry->d_inode) { | |
2030 | err = -ENOENT; | |
2031 | goto out_dput; | |
2032 | } | |
2033 | ||
2034 | inode = dentry->d_inode; | |
4260f7c7 SW |
2035 | dest = BTRFS_I(inode)->root; |
2036 | if (!capable(CAP_SYS_ADMIN)){ | |
2037 | /* | |
2038 | * Regular user. Only allow this with a special mount | |
2039 | * option, when the user has write+exec access to the | |
2040 | * subvol root, and when rmdir(2) would have been | |
2041 | * allowed. | |
2042 | * | |
2043 | * Note that this is _not_ check that the subvol is | |
2044 | * empty or doesn't contain data that we wouldn't | |
2045 | * otherwise be able to delete. | |
2046 | * | |
2047 | * Users who want to delete empty subvols should try | |
2048 | * rmdir(2). | |
2049 | */ | |
2050 | err = -EPERM; | |
2051 | if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
2052 | goto out_dput; | |
2053 | ||
2054 | /* | |
2055 | * Do not allow deletion if the parent dir is the same | |
2056 | * as the dir to be deleted. That means the ioctl | |
2057 | * must be called on the dentry referencing the root | |
2058 | * of the subvol, not a random directory contained | |
2059 | * within it. | |
2060 | */ | |
2061 | err = -EINVAL; | |
2062 | if (root == dest) | |
2063 | goto out_dput; | |
2064 | ||
2065 | err = inode_permission(inode, MAY_WRITE | MAY_EXEC); | |
2066 | if (err) | |
2067 | goto out_dput; | |
2068 | ||
2069 | /* check if subvolume may be deleted by a non-root user */ | |
2070 | err = btrfs_may_delete(dir, dentry, 1); | |
2071 | if (err) | |
2072 | goto out_dput; | |
2073 | } | |
2074 | ||
33345d01 | 2075 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
76dda93c YZ |
2076 | err = -EINVAL; |
2077 | goto out_dput; | |
2078 | } | |
2079 | ||
76dda93c YZ |
2080 | mutex_lock(&inode->i_mutex); |
2081 | err = d_invalidate(dentry); | |
2082 | if (err) | |
2083 | goto out_unlock; | |
2084 | ||
2085 | down_write(&root->fs_info->subvol_sem); | |
2086 | ||
2087 | err = may_destroy_subvol(dest); | |
2088 | if (err) | |
2089 | goto out_up_write; | |
2090 | ||
a22285a6 YZ |
2091 | trans = btrfs_start_transaction(root, 0); |
2092 | if (IS_ERR(trans)) { | |
2093 | err = PTR_ERR(trans); | |
d327099a | 2094 | goto out_up_write; |
a22285a6 YZ |
2095 | } |
2096 | trans->block_rsv = &root->fs_info->global_block_rsv; | |
2097 | ||
76dda93c YZ |
2098 | ret = btrfs_unlink_subvol(trans, root, dir, |
2099 | dest->root_key.objectid, | |
2100 | dentry->d_name.name, | |
2101 | dentry->d_name.len); | |
79787eaa JM |
2102 | if (ret) { |
2103 | err = ret; | |
2104 | btrfs_abort_transaction(trans, root, ret); | |
2105 | goto out_end_trans; | |
2106 | } | |
76dda93c YZ |
2107 | |
2108 | btrfs_record_root_in_trans(trans, dest); | |
2109 | ||
2110 | memset(&dest->root_item.drop_progress, 0, | |
2111 | sizeof(dest->root_item.drop_progress)); | |
2112 | dest->root_item.drop_level = 0; | |
2113 | btrfs_set_root_refs(&dest->root_item, 0); | |
2114 | ||
d68fc57b YZ |
2115 | if (!xchg(&dest->orphan_item_inserted, 1)) { |
2116 | ret = btrfs_insert_orphan_item(trans, | |
2117 | root->fs_info->tree_root, | |
2118 | dest->root_key.objectid); | |
79787eaa JM |
2119 | if (ret) { |
2120 | btrfs_abort_transaction(trans, root, ret); | |
2121 | err = ret; | |
2122 | goto out_end_trans; | |
2123 | } | |
d68fc57b | 2124 | } |
79787eaa | 2125 | out_end_trans: |
531cb13f | 2126 | ret = btrfs_end_transaction(trans, root); |
79787eaa JM |
2127 | if (ret && !err) |
2128 | err = ret; | |
76dda93c YZ |
2129 | inode->i_flags |= S_DEAD; |
2130 | out_up_write: | |
2131 | up_write(&root->fs_info->subvol_sem); | |
2132 | out_unlock: | |
2133 | mutex_unlock(&inode->i_mutex); | |
2134 | if (!err) { | |
efefb143 | 2135 | shrink_dcache_sb(root->fs_info->sb); |
76dda93c YZ |
2136 | btrfs_invalidate_inodes(dest); |
2137 | d_delete(dentry); | |
2138 | } | |
2139 | out_dput: | |
2140 | dput(dentry); | |
2141 | out_unlock_dir: | |
2142 | mutex_unlock(&dir->i_mutex); | |
2a79f17e | 2143 | mnt_drop_write_file(file); |
76dda93c YZ |
2144 | out: |
2145 | kfree(vol_args); | |
2146 | return err; | |
2147 | } | |
2148 | ||
1e701a32 | 2149 | static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
f46b5a66 CH |
2150 | { |
2151 | struct inode *inode = fdentry(file)->d_inode; | |
2152 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1e701a32 | 2153 | struct btrfs_ioctl_defrag_range_args *range; |
c146afad YZ |
2154 | int ret; |
2155 | ||
b83cc969 LZ |
2156 | if (btrfs_root_readonly(root)) |
2157 | return -EROFS; | |
2158 | ||
a561be71 | 2159 | ret = mnt_want_write_file(file); |
c146afad YZ |
2160 | if (ret) |
2161 | return ret; | |
f46b5a66 CH |
2162 | |
2163 | switch (inode->i_mode & S_IFMT) { | |
2164 | case S_IFDIR: | |
e441d54d CM |
2165 | if (!capable(CAP_SYS_ADMIN)) { |
2166 | ret = -EPERM; | |
2167 | goto out; | |
2168 | } | |
8929ecfa YZ |
2169 | ret = btrfs_defrag_root(root, 0); |
2170 | if (ret) | |
2171 | goto out; | |
2172 | ret = btrfs_defrag_root(root->fs_info->extent_root, 0); | |
f46b5a66 CH |
2173 | break; |
2174 | case S_IFREG: | |
e441d54d CM |
2175 | if (!(file->f_mode & FMODE_WRITE)) { |
2176 | ret = -EINVAL; | |
2177 | goto out; | |
2178 | } | |
1e701a32 CM |
2179 | |
2180 | range = kzalloc(sizeof(*range), GFP_KERNEL); | |
2181 | if (!range) { | |
2182 | ret = -ENOMEM; | |
2183 | goto out; | |
2184 | } | |
2185 | ||
2186 | if (argp) { | |
2187 | if (copy_from_user(range, argp, | |
2188 | sizeof(*range))) { | |
2189 | ret = -EFAULT; | |
2190 | kfree(range); | |
683be16e | 2191 | goto out; |
1e701a32 CM |
2192 | } |
2193 | /* compression requires us to start the IO */ | |
2194 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
2195 | range->flags |= BTRFS_DEFRAG_RANGE_START_IO; | |
2196 | range->extent_thresh = (u32)-1; | |
2197 | } | |
2198 | } else { | |
2199 | /* the rest are all set to zero by kzalloc */ | |
2200 | range->len = (u64)-1; | |
2201 | } | |
4cb5300b CM |
2202 | ret = btrfs_defrag_file(fdentry(file)->d_inode, file, |
2203 | range, 0, 0); | |
2204 | if (ret > 0) | |
2205 | ret = 0; | |
1e701a32 | 2206 | kfree(range); |
f46b5a66 | 2207 | break; |
8929ecfa YZ |
2208 | default: |
2209 | ret = -EINVAL; | |
f46b5a66 | 2210 | } |
e441d54d | 2211 | out: |
2a79f17e | 2212 | mnt_drop_write_file(file); |
e441d54d | 2213 | return ret; |
f46b5a66 CH |
2214 | } |
2215 | ||
b2950863 | 2216 | static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
2217 | { |
2218 | struct btrfs_ioctl_vol_args *vol_args; | |
2219 | int ret; | |
2220 | ||
e441d54d CM |
2221 | if (!capable(CAP_SYS_ADMIN)) |
2222 | return -EPERM; | |
2223 | ||
c9e9f97b ID |
2224 | mutex_lock(&root->fs_info->volume_mutex); |
2225 | if (root->fs_info->balance_ctl) { | |
2226 | printk(KERN_INFO "btrfs: balance in progress\n"); | |
2227 | ret = -EINVAL; | |
2228 | goto out; | |
2229 | } | |
2230 | ||
dae7b665 | 2231 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2232 | if (IS_ERR(vol_args)) { |
2233 | ret = PTR_ERR(vol_args); | |
2234 | goto out; | |
2235 | } | |
f46b5a66 | 2236 | |
5516e595 | 2237 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
2238 | ret = btrfs_init_new_device(root, vol_args->name); |
2239 | ||
f46b5a66 | 2240 | kfree(vol_args); |
c9e9f97b ID |
2241 | out: |
2242 | mutex_unlock(&root->fs_info->volume_mutex); | |
f46b5a66 CH |
2243 | return ret; |
2244 | } | |
2245 | ||
b2950863 | 2246 | static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
2247 | { |
2248 | struct btrfs_ioctl_vol_args *vol_args; | |
2249 | int ret; | |
2250 | ||
e441d54d CM |
2251 | if (!capable(CAP_SYS_ADMIN)) |
2252 | return -EPERM; | |
2253 | ||
c146afad YZ |
2254 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
2255 | return -EROFS; | |
2256 | ||
c9e9f97b ID |
2257 | mutex_lock(&root->fs_info->volume_mutex); |
2258 | if (root->fs_info->balance_ctl) { | |
2259 | printk(KERN_INFO "btrfs: balance in progress\n"); | |
2260 | ret = -EINVAL; | |
2261 | goto out; | |
2262 | } | |
2263 | ||
dae7b665 | 2264 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2265 | if (IS_ERR(vol_args)) { |
2266 | ret = PTR_ERR(vol_args); | |
2267 | goto out; | |
2268 | } | |
f46b5a66 | 2269 | |
5516e595 | 2270 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
2271 | ret = btrfs_rm_device(root, vol_args->name); |
2272 | ||
f46b5a66 | 2273 | kfree(vol_args); |
c9e9f97b ID |
2274 | out: |
2275 | mutex_unlock(&root->fs_info->volume_mutex); | |
f46b5a66 CH |
2276 | return ret; |
2277 | } | |
2278 | ||
475f6387 JS |
2279 | static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) |
2280 | { | |
027ed2f0 | 2281 | struct btrfs_ioctl_fs_info_args *fi_args; |
475f6387 JS |
2282 | struct btrfs_device *device; |
2283 | struct btrfs_device *next; | |
2284 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
027ed2f0 | 2285 | int ret = 0; |
475f6387 JS |
2286 | |
2287 | if (!capable(CAP_SYS_ADMIN)) | |
2288 | return -EPERM; | |
2289 | ||
027ed2f0 LZ |
2290 | fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); |
2291 | if (!fi_args) | |
2292 | return -ENOMEM; | |
2293 | ||
2294 | fi_args->num_devices = fs_devices->num_devices; | |
2295 | memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); | |
475f6387 JS |
2296 | |
2297 | mutex_lock(&fs_devices->device_list_mutex); | |
2298 | list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { | |
027ed2f0 LZ |
2299 | if (device->devid > fi_args->max_id) |
2300 | fi_args->max_id = device->devid; | |
475f6387 JS |
2301 | } |
2302 | mutex_unlock(&fs_devices->device_list_mutex); | |
2303 | ||
027ed2f0 LZ |
2304 | if (copy_to_user(arg, fi_args, sizeof(*fi_args))) |
2305 | ret = -EFAULT; | |
475f6387 | 2306 | |
027ed2f0 LZ |
2307 | kfree(fi_args); |
2308 | return ret; | |
475f6387 JS |
2309 | } |
2310 | ||
2311 | static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) | |
2312 | { | |
2313 | struct btrfs_ioctl_dev_info_args *di_args; | |
2314 | struct btrfs_device *dev; | |
2315 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
2316 | int ret = 0; | |
2317 | char *s_uuid = NULL; | |
2318 | char empty_uuid[BTRFS_UUID_SIZE] = {0}; | |
2319 | ||
2320 | if (!capable(CAP_SYS_ADMIN)) | |
2321 | return -EPERM; | |
2322 | ||
2323 | di_args = memdup_user(arg, sizeof(*di_args)); | |
2324 | if (IS_ERR(di_args)) | |
2325 | return PTR_ERR(di_args); | |
2326 | ||
2327 | if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0) | |
2328 | s_uuid = di_args->uuid; | |
2329 | ||
2330 | mutex_lock(&fs_devices->device_list_mutex); | |
2331 | dev = btrfs_find_device(root, di_args->devid, s_uuid, NULL); | |
2332 | mutex_unlock(&fs_devices->device_list_mutex); | |
2333 | ||
2334 | if (!dev) { | |
2335 | ret = -ENODEV; | |
2336 | goto out; | |
2337 | } | |
2338 | ||
2339 | di_args->devid = dev->devid; | |
2340 | di_args->bytes_used = dev->bytes_used; | |
2341 | di_args->total_bytes = dev->total_bytes; | |
2342 | memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); | |
a27202fb | 2343 | if (dev->name) { |
606686ee JB |
2344 | struct rcu_string *name; |
2345 | ||
2346 | rcu_read_lock(); | |
2347 | name = rcu_dereference(dev->name); | |
2348 | strncpy(di_args->path, name->str, sizeof(di_args->path)); | |
2349 | rcu_read_unlock(); | |
a27202fb JM |
2350 | di_args->path[sizeof(di_args->path) - 1] = 0; |
2351 | } else { | |
99ba55ad | 2352 | di_args->path[0] = '\0'; |
a27202fb | 2353 | } |
475f6387 JS |
2354 | |
2355 | out: | |
2356 | if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) | |
2357 | ret = -EFAULT; | |
2358 | ||
2359 | kfree(di_args); | |
2360 | return ret; | |
2361 | } | |
2362 | ||
76dda93c YZ |
2363 | static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, |
2364 | u64 off, u64 olen, u64 destoff) | |
f46b5a66 CH |
2365 | { |
2366 | struct inode *inode = fdentry(file)->d_inode; | |
2367 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2903ff01 | 2368 | struct fd src_file; |
f46b5a66 CH |
2369 | struct inode *src; |
2370 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 2371 | struct btrfs_path *path; |
f46b5a66 | 2372 | struct extent_buffer *leaf; |
ae01a0ab YZ |
2373 | char *buf; |
2374 | struct btrfs_key key; | |
f46b5a66 CH |
2375 | u32 nritems; |
2376 | int slot; | |
ae01a0ab | 2377 | int ret; |
c5c9cd4d SW |
2378 | u64 len = olen; |
2379 | u64 bs = root->fs_info->sb->s_blocksize; | |
d20f7043 | 2380 | |
c5c9cd4d SW |
2381 | /* |
2382 | * TODO: | |
2383 | * - split compressed inline extents. annoying: we need to | |
2384 | * decompress into destination's address_space (the file offset | |
2385 | * may change, so source mapping won't do), then recompress (or | |
2386 | * otherwise reinsert) a subrange. | |
2387 | * - allow ranges within the same file to be cloned (provided | |
2388 | * they don't overlap)? | |
2389 | */ | |
2390 | ||
e441d54d | 2391 | /* the destination must be opened for writing */ |
2ebc3464 | 2392 | if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) |
e441d54d CM |
2393 | return -EINVAL; |
2394 | ||
b83cc969 LZ |
2395 | if (btrfs_root_readonly(root)) |
2396 | return -EROFS; | |
2397 | ||
a561be71 | 2398 | ret = mnt_want_write_file(file); |
c146afad YZ |
2399 | if (ret) |
2400 | return ret; | |
2401 | ||
2903ff01 AV |
2402 | src_file = fdget(srcfd); |
2403 | if (!src_file.file) { | |
ab67b7c1 YZ |
2404 | ret = -EBADF; |
2405 | goto out_drop_write; | |
2406 | } | |
5dc64164 | 2407 | |
362a20c5 | 2408 | ret = -EXDEV; |
2903ff01 | 2409 | if (src_file.file->f_path.mnt != file->f_path.mnt) |
362a20c5 DS |
2410 | goto out_fput; |
2411 | ||
2903ff01 | 2412 | src = src_file.file->f_dentry->d_inode; |
f46b5a66 | 2413 | |
c5c9cd4d SW |
2414 | ret = -EINVAL; |
2415 | if (src == inode) | |
2416 | goto out_fput; | |
2417 | ||
5dc64164 | 2418 | /* the src must be open for reading */ |
2903ff01 | 2419 | if (!(src_file.file->f_mode & FMODE_READ)) |
5dc64164 DR |
2420 | goto out_fput; |
2421 | ||
0e7b824c LZ |
2422 | /* don't make the dst file partly checksummed */ |
2423 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != | |
2424 | (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) | |
2425 | goto out_fput; | |
2426 | ||
ae01a0ab YZ |
2427 | ret = -EISDIR; |
2428 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) | |
2429 | goto out_fput; | |
2430 | ||
f46b5a66 | 2431 | ret = -EXDEV; |
362a20c5 | 2432 | if (src->i_sb != inode->i_sb) |
ae01a0ab YZ |
2433 | goto out_fput; |
2434 | ||
2435 | ret = -ENOMEM; | |
2436 | buf = vmalloc(btrfs_level_size(root, 0)); | |
2437 | if (!buf) | |
2438 | goto out_fput; | |
2439 | ||
2440 | path = btrfs_alloc_path(); | |
2441 | if (!path) { | |
2442 | vfree(buf); | |
f46b5a66 | 2443 | goto out_fput; |
ae01a0ab YZ |
2444 | } |
2445 | path->reada = 2; | |
f46b5a66 CH |
2446 | |
2447 | if (inode < src) { | |
fccdae43 SW |
2448 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); |
2449 | mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); | |
f46b5a66 | 2450 | } else { |
fccdae43 SW |
2451 | mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); |
2452 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); | |
f46b5a66 CH |
2453 | } |
2454 | ||
c5c9cd4d SW |
2455 | /* determine range to clone */ |
2456 | ret = -EINVAL; | |
2ebc3464 | 2457 | if (off + len > src->i_size || off + len < off) |
f46b5a66 | 2458 | goto out_unlock; |
c5c9cd4d SW |
2459 | if (len == 0) |
2460 | olen = len = src->i_size - off; | |
2461 | /* if we extend to eof, continue to block boundary */ | |
2462 | if (off + len == src->i_size) | |
2a6b8dae | 2463 | len = ALIGN(src->i_size, bs) - off; |
c5c9cd4d SW |
2464 | |
2465 | /* verify the end result is block aligned */ | |
2a6b8dae LZ |
2466 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || |
2467 | !IS_ALIGNED(destoff, bs)) | |
c5c9cd4d SW |
2468 | goto out_unlock; |
2469 | ||
d525e8ab LZ |
2470 | if (destoff > inode->i_size) { |
2471 | ret = btrfs_cont_expand(inode, inode->i_size, destoff); | |
2472 | if (ret) | |
2473 | goto out_unlock; | |
2474 | } | |
2475 | ||
71ef0786 LZ |
2476 | /* truncate page cache pages from target inode range */ |
2477 | truncate_inode_pages_range(&inode->i_data, destoff, | |
2478 | PAGE_CACHE_ALIGN(destoff + len) - 1); | |
2479 | ||
f46b5a66 CH |
2480 | /* do any pending delalloc/csum calc on src, one way or |
2481 | another, and lock file content */ | |
2482 | while (1) { | |
31840ae1 | 2483 | struct btrfs_ordered_extent *ordered; |
aa42ffd9 LB |
2484 | lock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); |
2485 | ordered = btrfs_lookup_first_ordered_extent(src, off + len - 1); | |
9a019196 | 2486 | if (!ordered && |
aa42ffd9 LB |
2487 | !test_range_bit(&BTRFS_I(src)->io_tree, off, off + len - 1, |
2488 | EXTENT_DELALLOC, 0, NULL)) | |
f46b5a66 | 2489 | break; |
aa42ffd9 | 2490 | unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); |
ae01a0ab YZ |
2491 | if (ordered) |
2492 | btrfs_put_ordered_extent(ordered); | |
9a019196 | 2493 | btrfs_wait_ordered_range(src, off, len); |
f46b5a66 CH |
2494 | } |
2495 | ||
c5c9cd4d | 2496 | /* clone data */ |
33345d01 | 2497 | key.objectid = btrfs_ino(src); |
ae01a0ab YZ |
2498 | key.type = BTRFS_EXTENT_DATA_KEY; |
2499 | key.offset = 0; | |
f46b5a66 CH |
2500 | |
2501 | while (1) { | |
2502 | /* | |
2503 | * note the key will change type as we walk through the | |
2504 | * tree. | |
2505 | */ | |
362a20c5 DS |
2506 | ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, |
2507 | 0, 0); | |
f46b5a66 CH |
2508 | if (ret < 0) |
2509 | goto out; | |
2510 | ||
ae01a0ab YZ |
2511 | nritems = btrfs_header_nritems(path->nodes[0]); |
2512 | if (path->slots[0] >= nritems) { | |
362a20c5 | 2513 | ret = btrfs_next_leaf(BTRFS_I(src)->root, path); |
f46b5a66 CH |
2514 | if (ret < 0) |
2515 | goto out; | |
2516 | if (ret > 0) | |
2517 | break; | |
ae01a0ab | 2518 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
2519 | } |
2520 | leaf = path->nodes[0]; | |
2521 | slot = path->slots[0]; | |
f46b5a66 | 2522 | |
ae01a0ab | 2523 | btrfs_item_key_to_cpu(leaf, &key, slot); |
d20f7043 | 2524 | if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || |
33345d01 | 2525 | key.objectid != btrfs_ino(src)) |
f46b5a66 CH |
2526 | break; |
2527 | ||
c5c9cd4d SW |
2528 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
2529 | struct btrfs_file_extent_item *extent; | |
2530 | int type; | |
31840ae1 ZY |
2531 | u32 size; |
2532 | struct btrfs_key new_key; | |
c5c9cd4d SW |
2533 | u64 disko = 0, diskl = 0; |
2534 | u64 datao = 0, datal = 0; | |
2535 | u8 comp; | |
b5384d48 | 2536 | u64 endoff; |
31840ae1 ZY |
2537 | |
2538 | size = btrfs_item_size_nr(leaf, slot); | |
2539 | read_extent_buffer(leaf, buf, | |
2540 | btrfs_item_ptr_offset(leaf, slot), | |
2541 | size); | |
c5c9cd4d SW |
2542 | |
2543 | extent = btrfs_item_ptr(leaf, slot, | |
2544 | struct btrfs_file_extent_item); | |
2545 | comp = btrfs_file_extent_compression(leaf, extent); | |
2546 | type = btrfs_file_extent_type(leaf, extent); | |
c8a894d7 CM |
2547 | if (type == BTRFS_FILE_EXTENT_REG || |
2548 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d397712b CM |
2549 | disko = btrfs_file_extent_disk_bytenr(leaf, |
2550 | extent); | |
2551 | diskl = btrfs_file_extent_disk_num_bytes(leaf, | |
2552 | extent); | |
c5c9cd4d | 2553 | datao = btrfs_file_extent_offset(leaf, extent); |
d397712b CM |
2554 | datal = btrfs_file_extent_num_bytes(leaf, |
2555 | extent); | |
c5c9cd4d SW |
2556 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
2557 | /* take upper bound, may be compressed */ | |
2558 | datal = btrfs_file_extent_ram_bytes(leaf, | |
2559 | extent); | |
2560 | } | |
b3b4aa74 | 2561 | btrfs_release_path(path); |
31840ae1 | 2562 | |
050006a7 | 2563 | if (key.offset + datal <= off || |
aa42ffd9 | 2564 | key.offset >= off + len - 1) |
c5c9cd4d SW |
2565 | goto next; |
2566 | ||
31840ae1 | 2567 | memcpy(&new_key, &key, sizeof(new_key)); |
33345d01 | 2568 | new_key.objectid = btrfs_ino(inode); |
4d728ec7 LZ |
2569 | if (off <= key.offset) |
2570 | new_key.offset = key.offset + destoff - off; | |
2571 | else | |
2572 | new_key.offset = destoff; | |
31840ae1 | 2573 | |
b6f3409b SW |
2574 | /* |
2575 | * 1 - adjusting old extent (we may have to split it) | |
2576 | * 1 - add new extent | |
2577 | * 1 - inode update | |
2578 | */ | |
2579 | trans = btrfs_start_transaction(root, 3); | |
a22285a6 YZ |
2580 | if (IS_ERR(trans)) { |
2581 | ret = PTR_ERR(trans); | |
2582 | goto out; | |
2583 | } | |
2584 | ||
c8a894d7 CM |
2585 | if (type == BTRFS_FILE_EXTENT_REG || |
2586 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d72c0842 LZ |
2587 | /* |
2588 | * a | --- range to clone ---| b | |
2589 | * | ------------- extent ------------- | | |
2590 | */ | |
2591 | ||
2592 | /* substract range b */ | |
2593 | if (key.offset + datal > off + len) | |
2594 | datal = off + len - key.offset; | |
2595 | ||
2596 | /* substract range a */ | |
a22285a6 YZ |
2597 | if (off > key.offset) { |
2598 | datao += off - key.offset; | |
2599 | datal -= off - key.offset; | |
2600 | } | |
2601 | ||
5dc562c5 | 2602 | ret = btrfs_drop_extents(trans, root, inode, |
a22285a6 YZ |
2603 | new_key.offset, |
2604 | new_key.offset + datal, | |
2671485d | 2605 | 1); |
79787eaa JM |
2606 | if (ret) { |
2607 | btrfs_abort_transaction(trans, root, | |
2608 | ret); | |
2609 | btrfs_end_transaction(trans, root); | |
2610 | goto out; | |
2611 | } | |
a22285a6 | 2612 | |
c5c9cd4d SW |
2613 | ret = btrfs_insert_empty_item(trans, root, path, |
2614 | &new_key, size); | |
79787eaa JM |
2615 | if (ret) { |
2616 | btrfs_abort_transaction(trans, root, | |
2617 | ret); | |
2618 | btrfs_end_transaction(trans, root); | |
2619 | goto out; | |
2620 | } | |
c5c9cd4d SW |
2621 | |
2622 | leaf = path->nodes[0]; | |
2623 | slot = path->slots[0]; | |
2624 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
2625 | btrfs_item_ptr_offset(leaf, slot), |
2626 | size); | |
ae01a0ab | 2627 | |
c5c9cd4d | 2628 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 2629 | struct btrfs_file_extent_item); |
c5c9cd4d | 2630 | |
c5c9cd4d SW |
2631 | /* disko == 0 means it's a hole */ |
2632 | if (!disko) | |
2633 | datao = 0; | |
c5c9cd4d SW |
2634 | |
2635 | btrfs_set_file_extent_offset(leaf, extent, | |
2636 | datao); | |
2637 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
2638 | datal); | |
2639 | if (disko) { | |
2640 | inode_add_bytes(inode, datal); | |
ae01a0ab | 2641 | ret = btrfs_inc_extent_ref(trans, root, |
5d4f98a2 YZ |
2642 | disko, diskl, 0, |
2643 | root->root_key.objectid, | |
33345d01 | 2644 | btrfs_ino(inode), |
66d7e7f0 AJ |
2645 | new_key.offset - datao, |
2646 | 0); | |
79787eaa JM |
2647 | if (ret) { |
2648 | btrfs_abort_transaction(trans, | |
2649 | root, | |
2650 | ret); | |
2651 | btrfs_end_transaction(trans, | |
2652 | root); | |
2653 | goto out; | |
2654 | ||
2655 | } | |
f46b5a66 | 2656 | } |
c5c9cd4d SW |
2657 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
2658 | u64 skip = 0; | |
2659 | u64 trim = 0; | |
2660 | if (off > key.offset) { | |
2661 | skip = off - key.offset; | |
2662 | new_key.offset += skip; | |
2663 | } | |
d397712b | 2664 | |
aa42ffd9 LB |
2665 | if (key.offset + datal > off + len) |
2666 | trim = key.offset + datal - (off + len); | |
d397712b | 2667 | |
c5c9cd4d | 2668 | if (comp && (skip || trim)) { |
c5c9cd4d | 2669 | ret = -EINVAL; |
a22285a6 | 2670 | btrfs_end_transaction(trans, root); |
c5c9cd4d SW |
2671 | goto out; |
2672 | } | |
2673 | size -= skip + trim; | |
2674 | datal -= skip + trim; | |
a22285a6 | 2675 | |
5dc562c5 | 2676 | ret = btrfs_drop_extents(trans, root, inode, |
a22285a6 YZ |
2677 | new_key.offset, |
2678 | new_key.offset + datal, | |
2671485d | 2679 | 1); |
79787eaa JM |
2680 | if (ret) { |
2681 | btrfs_abort_transaction(trans, root, | |
2682 | ret); | |
2683 | btrfs_end_transaction(trans, root); | |
2684 | goto out; | |
2685 | } | |
a22285a6 | 2686 | |
c5c9cd4d SW |
2687 | ret = btrfs_insert_empty_item(trans, root, path, |
2688 | &new_key, size); | |
79787eaa JM |
2689 | if (ret) { |
2690 | btrfs_abort_transaction(trans, root, | |
2691 | ret); | |
2692 | btrfs_end_transaction(trans, root); | |
2693 | goto out; | |
2694 | } | |
c5c9cd4d SW |
2695 | |
2696 | if (skip) { | |
d397712b CM |
2697 | u32 start = |
2698 | btrfs_file_extent_calc_inline_size(0); | |
c5c9cd4d SW |
2699 | memmove(buf+start, buf+start+skip, |
2700 | datal); | |
2701 | } | |
2702 | ||
2703 | leaf = path->nodes[0]; | |
2704 | slot = path->slots[0]; | |
2705 | write_extent_buffer(leaf, buf, | |
2706 | btrfs_item_ptr_offset(leaf, slot), | |
2707 | size); | |
2708 | inode_add_bytes(inode, datal); | |
f46b5a66 | 2709 | } |
c5c9cd4d SW |
2710 | |
2711 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 2712 | btrfs_release_path(path); |
c5c9cd4d | 2713 | |
0c4d2d95 | 2714 | inode_inc_iversion(inode); |
a22285a6 | 2715 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
b5384d48 SW |
2716 | |
2717 | /* | |
2718 | * we round up to the block size at eof when | |
2719 | * determining which extents to clone above, | |
2720 | * but shouldn't round up the file size | |
2721 | */ | |
2722 | endoff = new_key.offset + datal; | |
5f3888ff LZ |
2723 | if (endoff > destoff+olen) |
2724 | endoff = destoff+olen; | |
b5384d48 SW |
2725 | if (endoff > inode->i_size) |
2726 | btrfs_i_size_write(inode, endoff); | |
2727 | ||
a22285a6 | 2728 | ret = btrfs_update_inode(trans, root, inode); |
79787eaa JM |
2729 | if (ret) { |
2730 | btrfs_abort_transaction(trans, root, ret); | |
2731 | btrfs_end_transaction(trans, root); | |
2732 | goto out; | |
2733 | } | |
2734 | ret = btrfs_end_transaction(trans, root); | |
a22285a6 | 2735 | } |
d397712b | 2736 | next: |
b3b4aa74 | 2737 | btrfs_release_path(path); |
f46b5a66 | 2738 | key.offset++; |
f46b5a66 | 2739 | } |
f46b5a66 CH |
2740 | ret = 0; |
2741 | out: | |
b3b4aa74 | 2742 | btrfs_release_path(path); |
aa42ffd9 | 2743 | unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); |
f46b5a66 CH |
2744 | out_unlock: |
2745 | mutex_unlock(&src->i_mutex); | |
2746 | mutex_unlock(&inode->i_mutex); | |
ae01a0ab YZ |
2747 | vfree(buf); |
2748 | btrfs_free_path(path); | |
f46b5a66 | 2749 | out_fput: |
2903ff01 | 2750 | fdput(src_file); |
ab67b7c1 | 2751 | out_drop_write: |
2a79f17e | 2752 | mnt_drop_write_file(file); |
f46b5a66 CH |
2753 | return ret; |
2754 | } | |
2755 | ||
7a865e8a | 2756 | static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) |
c5c9cd4d SW |
2757 | { |
2758 | struct btrfs_ioctl_clone_range_args args; | |
2759 | ||
7a865e8a | 2760 | if (copy_from_user(&args, argp, sizeof(args))) |
c5c9cd4d SW |
2761 | return -EFAULT; |
2762 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, | |
2763 | args.src_length, args.dest_offset); | |
2764 | } | |
2765 | ||
f46b5a66 CH |
2766 | /* |
2767 | * there are many ways the trans_start and trans_end ioctls can lead | |
2768 | * to deadlocks. They should only be used by applications that | |
2769 | * basically own the machine, and have a very in depth understanding | |
2770 | * of all the possible deadlocks and enospc problems. | |
2771 | */ | |
b2950863 | 2772 | static long btrfs_ioctl_trans_start(struct file *file) |
f46b5a66 CH |
2773 | { |
2774 | struct inode *inode = fdentry(file)->d_inode; | |
2775 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2776 | struct btrfs_trans_handle *trans; | |
1ab86aed | 2777 | int ret; |
f46b5a66 | 2778 | |
1ab86aed | 2779 | ret = -EPERM; |
df5b5520 | 2780 | if (!capable(CAP_SYS_ADMIN)) |
1ab86aed | 2781 | goto out; |
df5b5520 | 2782 | |
1ab86aed SW |
2783 | ret = -EINPROGRESS; |
2784 | if (file->private_data) | |
f46b5a66 | 2785 | goto out; |
9ca9ee09 | 2786 | |
b83cc969 LZ |
2787 | ret = -EROFS; |
2788 | if (btrfs_root_readonly(root)) | |
2789 | goto out; | |
2790 | ||
a561be71 | 2791 | ret = mnt_want_write_file(file); |
c146afad YZ |
2792 | if (ret) |
2793 | goto out; | |
2794 | ||
a4abeea4 | 2795 | atomic_inc(&root->fs_info->open_ioctl_trans); |
9ca9ee09 | 2796 | |
1ab86aed | 2797 | ret = -ENOMEM; |
7a7eaa40 | 2798 | trans = btrfs_start_ioctl_transaction(root); |
abd30bb0 | 2799 | if (IS_ERR(trans)) |
1ab86aed SW |
2800 | goto out_drop; |
2801 | ||
2802 | file->private_data = trans; | |
2803 | return 0; | |
2804 | ||
2805 | out_drop: | |
a4abeea4 | 2806 | atomic_dec(&root->fs_info->open_ioctl_trans); |
2a79f17e | 2807 | mnt_drop_write_file(file); |
f46b5a66 | 2808 | out: |
f46b5a66 CH |
2809 | return ret; |
2810 | } | |
2811 | ||
6ef5ed0d JB |
2812 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
2813 | { | |
2814 | struct inode *inode = fdentry(file)->d_inode; | |
2815 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2816 | struct btrfs_root *new_root; | |
2817 | struct btrfs_dir_item *di; | |
2818 | struct btrfs_trans_handle *trans; | |
2819 | struct btrfs_path *path; | |
2820 | struct btrfs_key location; | |
2821 | struct btrfs_disk_key disk_key; | |
6ef5ed0d JB |
2822 | u64 objectid = 0; |
2823 | u64 dir_id; | |
2824 | ||
2825 | if (!capable(CAP_SYS_ADMIN)) | |
2826 | return -EPERM; | |
2827 | ||
2828 | if (copy_from_user(&objectid, argp, sizeof(objectid))) | |
2829 | return -EFAULT; | |
2830 | ||
2831 | if (!objectid) | |
2832 | objectid = root->root_key.objectid; | |
2833 | ||
2834 | location.objectid = objectid; | |
2835 | location.type = BTRFS_ROOT_ITEM_KEY; | |
2836 | location.offset = (u64)-1; | |
2837 | ||
2838 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
2839 | if (IS_ERR(new_root)) | |
2840 | return PTR_ERR(new_root); | |
2841 | ||
2842 | if (btrfs_root_refs(&new_root->root_item) == 0) | |
2843 | return -ENOENT; | |
2844 | ||
2845 | path = btrfs_alloc_path(); | |
2846 | if (!path) | |
2847 | return -ENOMEM; | |
2848 | path->leave_spinning = 1; | |
2849 | ||
2850 | trans = btrfs_start_transaction(root, 1); | |
98d5dc13 | 2851 | if (IS_ERR(trans)) { |
6ef5ed0d | 2852 | btrfs_free_path(path); |
98d5dc13 | 2853 | return PTR_ERR(trans); |
6ef5ed0d JB |
2854 | } |
2855 | ||
6c41761f | 2856 | dir_id = btrfs_super_root_dir(root->fs_info->super_copy); |
6ef5ed0d JB |
2857 | di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, |
2858 | dir_id, "default", 7, 1); | |
cf1e99a4 | 2859 | if (IS_ERR_OR_NULL(di)) { |
6ef5ed0d JB |
2860 | btrfs_free_path(path); |
2861 | btrfs_end_transaction(trans, root); | |
2862 | printk(KERN_ERR "Umm, you don't have the default dir item, " | |
2863 | "this isn't going to work\n"); | |
2864 | return -ENOENT; | |
2865 | } | |
2866 | ||
2867 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); | |
2868 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); | |
2869 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
2870 | btrfs_free_path(path); | |
2871 | ||
2b0ce2c2 | 2872 | btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); |
6ef5ed0d JB |
2873 | btrfs_end_transaction(trans, root); |
2874 | ||
2875 | return 0; | |
2876 | } | |
2877 | ||
5af3e8cc SB |
2878 | void btrfs_get_block_group_info(struct list_head *groups_list, |
2879 | struct btrfs_ioctl_space_info *space) | |
bf5fc093 JB |
2880 | { |
2881 | struct btrfs_block_group_cache *block_group; | |
2882 | ||
2883 | space->total_bytes = 0; | |
2884 | space->used_bytes = 0; | |
2885 | space->flags = 0; | |
2886 | list_for_each_entry(block_group, groups_list, list) { | |
2887 | space->flags = block_group->flags; | |
2888 | space->total_bytes += block_group->key.offset; | |
2889 | space->used_bytes += | |
2890 | btrfs_block_group_used(&block_group->item); | |
2891 | } | |
2892 | } | |
2893 | ||
1406e432 JB |
2894 | long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) |
2895 | { | |
2896 | struct btrfs_ioctl_space_args space_args; | |
2897 | struct btrfs_ioctl_space_info space; | |
2898 | struct btrfs_ioctl_space_info *dest; | |
7fde62bf | 2899 | struct btrfs_ioctl_space_info *dest_orig; |
13f2696f | 2900 | struct btrfs_ioctl_space_info __user *user_dest; |
1406e432 | 2901 | struct btrfs_space_info *info; |
bf5fc093 JB |
2902 | u64 types[] = {BTRFS_BLOCK_GROUP_DATA, |
2903 | BTRFS_BLOCK_GROUP_SYSTEM, | |
2904 | BTRFS_BLOCK_GROUP_METADATA, | |
2905 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; | |
2906 | int num_types = 4; | |
7fde62bf | 2907 | int alloc_size; |
1406e432 | 2908 | int ret = 0; |
51788b1b | 2909 | u64 slot_count = 0; |
bf5fc093 | 2910 | int i, c; |
1406e432 JB |
2911 | |
2912 | if (copy_from_user(&space_args, | |
2913 | (struct btrfs_ioctl_space_args __user *)arg, | |
2914 | sizeof(space_args))) | |
2915 | return -EFAULT; | |
2916 | ||
bf5fc093 JB |
2917 | for (i = 0; i < num_types; i++) { |
2918 | struct btrfs_space_info *tmp; | |
2919 | ||
2920 | info = NULL; | |
2921 | rcu_read_lock(); | |
2922 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
2923 | list) { | |
2924 | if (tmp->flags == types[i]) { | |
2925 | info = tmp; | |
2926 | break; | |
2927 | } | |
2928 | } | |
2929 | rcu_read_unlock(); | |
2930 | ||
2931 | if (!info) | |
2932 | continue; | |
2933 | ||
2934 | down_read(&info->groups_sem); | |
2935 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
2936 | if (!list_empty(&info->block_groups[c])) | |
2937 | slot_count++; | |
2938 | } | |
2939 | up_read(&info->groups_sem); | |
2940 | } | |
7fde62bf CM |
2941 | |
2942 | /* space_slots == 0 means they are asking for a count */ | |
2943 | if (space_args.space_slots == 0) { | |
2944 | space_args.total_spaces = slot_count; | |
2945 | goto out; | |
2946 | } | |
bf5fc093 | 2947 | |
51788b1b | 2948 | slot_count = min_t(u64, space_args.space_slots, slot_count); |
bf5fc093 | 2949 | |
7fde62bf | 2950 | alloc_size = sizeof(*dest) * slot_count; |
bf5fc093 | 2951 | |
7fde62bf CM |
2952 | /* we generally have at most 6 or so space infos, one for each raid |
2953 | * level. So, a whole page should be more than enough for everyone | |
2954 | */ | |
2955 | if (alloc_size > PAGE_CACHE_SIZE) | |
2956 | return -ENOMEM; | |
2957 | ||
1406e432 | 2958 | space_args.total_spaces = 0; |
7fde62bf CM |
2959 | dest = kmalloc(alloc_size, GFP_NOFS); |
2960 | if (!dest) | |
2961 | return -ENOMEM; | |
2962 | dest_orig = dest; | |
1406e432 | 2963 | |
7fde62bf | 2964 | /* now we have a buffer to copy into */ |
bf5fc093 JB |
2965 | for (i = 0; i < num_types; i++) { |
2966 | struct btrfs_space_info *tmp; | |
2967 | ||
51788b1b DR |
2968 | if (!slot_count) |
2969 | break; | |
2970 | ||
bf5fc093 JB |
2971 | info = NULL; |
2972 | rcu_read_lock(); | |
2973 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
2974 | list) { | |
2975 | if (tmp->flags == types[i]) { | |
2976 | info = tmp; | |
2977 | break; | |
2978 | } | |
2979 | } | |
2980 | rcu_read_unlock(); | |
7fde62bf | 2981 | |
bf5fc093 JB |
2982 | if (!info) |
2983 | continue; | |
2984 | down_read(&info->groups_sem); | |
2985 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
2986 | if (!list_empty(&info->block_groups[c])) { | |
5af3e8cc SB |
2987 | btrfs_get_block_group_info( |
2988 | &info->block_groups[c], &space); | |
bf5fc093 JB |
2989 | memcpy(dest, &space, sizeof(space)); |
2990 | dest++; | |
2991 | space_args.total_spaces++; | |
51788b1b | 2992 | slot_count--; |
bf5fc093 | 2993 | } |
51788b1b DR |
2994 | if (!slot_count) |
2995 | break; | |
bf5fc093 JB |
2996 | } |
2997 | up_read(&info->groups_sem); | |
1406e432 | 2998 | } |
1406e432 | 2999 | |
2eec6c81 | 3000 | user_dest = (struct btrfs_ioctl_space_info __user *) |
7fde62bf CM |
3001 | (arg + sizeof(struct btrfs_ioctl_space_args)); |
3002 | ||
3003 | if (copy_to_user(user_dest, dest_orig, alloc_size)) | |
3004 | ret = -EFAULT; | |
3005 | ||
3006 | kfree(dest_orig); | |
3007 | out: | |
3008 | if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) | |
1406e432 JB |
3009 | ret = -EFAULT; |
3010 | ||
3011 | return ret; | |
3012 | } | |
3013 | ||
f46b5a66 CH |
3014 | /* |
3015 | * there are many ways the trans_start and trans_end ioctls can lead | |
3016 | * to deadlocks. They should only be used by applications that | |
3017 | * basically own the machine, and have a very in depth understanding | |
3018 | * of all the possible deadlocks and enospc problems. | |
3019 | */ | |
3020 | long btrfs_ioctl_trans_end(struct file *file) | |
3021 | { | |
3022 | struct inode *inode = fdentry(file)->d_inode; | |
3023 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3024 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 3025 | |
f46b5a66 | 3026 | trans = file->private_data; |
1ab86aed SW |
3027 | if (!trans) |
3028 | return -EINVAL; | |
b214107e | 3029 | file->private_data = NULL; |
9ca9ee09 | 3030 | |
1ab86aed SW |
3031 | btrfs_end_transaction(trans, root); |
3032 | ||
a4abeea4 | 3033 | atomic_dec(&root->fs_info->open_ioctl_trans); |
9ca9ee09 | 3034 | |
2a79f17e | 3035 | mnt_drop_write_file(file); |
1ab86aed | 3036 | return 0; |
f46b5a66 CH |
3037 | } |
3038 | ||
46204592 SW |
3039 | static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) |
3040 | { | |
3041 | struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; | |
3042 | struct btrfs_trans_handle *trans; | |
3043 | u64 transid; | |
db5b493a | 3044 | int ret; |
46204592 SW |
3045 | |
3046 | trans = btrfs_start_transaction(root, 0); | |
98d5dc13 TI |
3047 | if (IS_ERR(trans)) |
3048 | return PTR_ERR(trans); | |
46204592 | 3049 | transid = trans->transid; |
db5b493a | 3050 | ret = btrfs_commit_transaction_async(trans, root, 0); |
8b2b2d3c TI |
3051 | if (ret) { |
3052 | btrfs_end_transaction(trans, root); | |
db5b493a | 3053 | return ret; |
8b2b2d3c | 3054 | } |
46204592 SW |
3055 | |
3056 | if (argp) | |
3057 | if (copy_to_user(argp, &transid, sizeof(transid))) | |
3058 | return -EFAULT; | |
3059 | return 0; | |
3060 | } | |
3061 | ||
3062 | static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) | |
3063 | { | |
3064 | struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; | |
3065 | u64 transid; | |
3066 | ||
3067 | if (argp) { | |
3068 | if (copy_from_user(&transid, argp, sizeof(transid))) | |
3069 | return -EFAULT; | |
3070 | } else { | |
3071 | transid = 0; /* current trans */ | |
3072 | } | |
3073 | return btrfs_wait_for_commit(root, transid); | |
3074 | } | |
3075 | ||
475f6387 JS |
3076 | static long btrfs_ioctl_scrub(struct btrfs_root *root, void __user *arg) |
3077 | { | |
3078 | int ret; | |
3079 | struct btrfs_ioctl_scrub_args *sa; | |
3080 | ||
3081 | if (!capable(CAP_SYS_ADMIN)) | |
3082 | return -EPERM; | |
3083 | ||
3084 | sa = memdup_user(arg, sizeof(*sa)); | |
3085 | if (IS_ERR(sa)) | |
3086 | return PTR_ERR(sa); | |
3087 | ||
3088 | ret = btrfs_scrub_dev(root, sa->devid, sa->start, sa->end, | |
8628764e | 3089 | &sa->progress, sa->flags & BTRFS_SCRUB_READONLY); |
475f6387 JS |
3090 | |
3091 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
3092 | ret = -EFAULT; | |
3093 | ||
3094 | kfree(sa); | |
3095 | return ret; | |
3096 | } | |
3097 | ||
3098 | static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) | |
3099 | { | |
3100 | if (!capable(CAP_SYS_ADMIN)) | |
3101 | return -EPERM; | |
3102 | ||
3103 | return btrfs_scrub_cancel(root); | |
3104 | } | |
3105 | ||
3106 | static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, | |
3107 | void __user *arg) | |
3108 | { | |
3109 | struct btrfs_ioctl_scrub_args *sa; | |
3110 | int ret; | |
3111 | ||
3112 | if (!capable(CAP_SYS_ADMIN)) | |
3113 | return -EPERM; | |
3114 | ||
3115 | sa = memdup_user(arg, sizeof(*sa)); | |
3116 | if (IS_ERR(sa)) | |
3117 | return PTR_ERR(sa); | |
3118 | ||
3119 | ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); | |
3120 | ||
3121 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
3122 | ret = -EFAULT; | |
3123 | ||
3124 | kfree(sa); | |
3125 | return ret; | |
3126 | } | |
3127 | ||
c11d2c23 | 3128 | static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, |
b27f7c0c | 3129 | void __user *arg) |
c11d2c23 SB |
3130 | { |
3131 | struct btrfs_ioctl_get_dev_stats *sa; | |
3132 | int ret; | |
3133 | ||
c11d2c23 SB |
3134 | sa = memdup_user(arg, sizeof(*sa)); |
3135 | if (IS_ERR(sa)) | |
3136 | return PTR_ERR(sa); | |
3137 | ||
b27f7c0c DS |
3138 | if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { |
3139 | kfree(sa); | |
3140 | return -EPERM; | |
3141 | } | |
3142 | ||
3143 | ret = btrfs_get_dev_stats(root, sa); | |
c11d2c23 SB |
3144 | |
3145 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
3146 | ret = -EFAULT; | |
3147 | ||
3148 | kfree(sa); | |
3149 | return ret; | |
3150 | } | |
3151 | ||
d7728c96 JS |
3152 | static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) |
3153 | { | |
3154 | int ret = 0; | |
3155 | int i; | |
740c3d22 | 3156 | u64 rel_ptr; |
d7728c96 | 3157 | int size; |
806468f8 | 3158 | struct btrfs_ioctl_ino_path_args *ipa = NULL; |
d7728c96 JS |
3159 | struct inode_fs_paths *ipath = NULL; |
3160 | struct btrfs_path *path; | |
3161 | ||
3162 | if (!capable(CAP_SYS_ADMIN)) | |
3163 | return -EPERM; | |
3164 | ||
3165 | path = btrfs_alloc_path(); | |
3166 | if (!path) { | |
3167 | ret = -ENOMEM; | |
3168 | goto out; | |
3169 | } | |
3170 | ||
3171 | ipa = memdup_user(arg, sizeof(*ipa)); | |
3172 | if (IS_ERR(ipa)) { | |
3173 | ret = PTR_ERR(ipa); | |
3174 | ipa = NULL; | |
3175 | goto out; | |
3176 | } | |
3177 | ||
3178 | size = min_t(u32, ipa->size, 4096); | |
3179 | ipath = init_ipath(size, root, path); | |
3180 | if (IS_ERR(ipath)) { | |
3181 | ret = PTR_ERR(ipath); | |
3182 | ipath = NULL; | |
3183 | goto out; | |
3184 | } | |
3185 | ||
3186 | ret = paths_from_inode(ipa->inum, ipath); | |
3187 | if (ret < 0) | |
3188 | goto out; | |
3189 | ||
3190 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) { | |
745c4d8e JM |
3191 | rel_ptr = ipath->fspath->val[i] - |
3192 | (u64)(unsigned long)ipath->fspath->val; | |
740c3d22 | 3193 | ipath->fspath->val[i] = rel_ptr; |
d7728c96 JS |
3194 | } |
3195 | ||
745c4d8e JM |
3196 | ret = copy_to_user((void *)(unsigned long)ipa->fspath, |
3197 | (void *)(unsigned long)ipath->fspath, size); | |
d7728c96 JS |
3198 | if (ret) { |
3199 | ret = -EFAULT; | |
3200 | goto out; | |
3201 | } | |
3202 | ||
3203 | out: | |
3204 | btrfs_free_path(path); | |
3205 | free_ipath(ipath); | |
3206 | kfree(ipa); | |
3207 | ||
3208 | return ret; | |
3209 | } | |
3210 | ||
3211 | static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) | |
3212 | { | |
3213 | struct btrfs_data_container *inodes = ctx; | |
3214 | const size_t c = 3 * sizeof(u64); | |
3215 | ||
3216 | if (inodes->bytes_left >= c) { | |
3217 | inodes->bytes_left -= c; | |
3218 | inodes->val[inodes->elem_cnt] = inum; | |
3219 | inodes->val[inodes->elem_cnt + 1] = offset; | |
3220 | inodes->val[inodes->elem_cnt + 2] = root; | |
3221 | inodes->elem_cnt += 3; | |
3222 | } else { | |
3223 | inodes->bytes_missing += c - inodes->bytes_left; | |
3224 | inodes->bytes_left = 0; | |
3225 | inodes->elem_missed += 3; | |
3226 | } | |
3227 | ||
3228 | return 0; | |
3229 | } | |
3230 | ||
3231 | static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, | |
3232 | void __user *arg) | |
3233 | { | |
3234 | int ret = 0; | |
3235 | int size; | |
d7728c96 JS |
3236 | struct btrfs_ioctl_logical_ino_args *loi; |
3237 | struct btrfs_data_container *inodes = NULL; | |
3238 | struct btrfs_path *path = NULL; | |
d7728c96 JS |
3239 | |
3240 | if (!capable(CAP_SYS_ADMIN)) | |
3241 | return -EPERM; | |
3242 | ||
3243 | loi = memdup_user(arg, sizeof(*loi)); | |
3244 | if (IS_ERR(loi)) { | |
3245 | ret = PTR_ERR(loi); | |
3246 | loi = NULL; | |
3247 | goto out; | |
3248 | } | |
3249 | ||
3250 | path = btrfs_alloc_path(); | |
3251 | if (!path) { | |
3252 | ret = -ENOMEM; | |
3253 | goto out; | |
3254 | } | |
3255 | ||
425d17a2 | 3256 | size = min_t(u32, loi->size, 64 * 1024); |
d7728c96 JS |
3257 | inodes = init_data_container(size); |
3258 | if (IS_ERR(inodes)) { | |
3259 | ret = PTR_ERR(inodes); | |
3260 | inodes = NULL; | |
3261 | goto out; | |
3262 | } | |
3263 | ||
df031f07 LB |
3264 | ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, |
3265 | build_ino_list, inodes); | |
3266 | if (ret == -EINVAL) | |
d7728c96 JS |
3267 | ret = -ENOENT; |
3268 | if (ret < 0) | |
3269 | goto out; | |
3270 | ||
745c4d8e JM |
3271 | ret = copy_to_user((void *)(unsigned long)loi->inodes, |
3272 | (void *)(unsigned long)inodes, size); | |
d7728c96 JS |
3273 | if (ret) |
3274 | ret = -EFAULT; | |
3275 | ||
3276 | out: | |
3277 | btrfs_free_path(path); | |
425d17a2 | 3278 | vfree(inodes); |
d7728c96 JS |
3279 | kfree(loi); |
3280 | ||
3281 | return ret; | |
3282 | } | |
3283 | ||
19a39dce | 3284 | void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, |
c9e9f97b ID |
3285 | struct btrfs_ioctl_balance_args *bargs) |
3286 | { | |
3287 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
3288 | ||
3289 | bargs->flags = bctl->flags; | |
3290 | ||
837d5b6e ID |
3291 | if (atomic_read(&fs_info->balance_running)) |
3292 | bargs->state |= BTRFS_BALANCE_STATE_RUNNING; | |
3293 | if (atomic_read(&fs_info->balance_pause_req)) | |
3294 | bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; | |
a7e99c69 ID |
3295 | if (atomic_read(&fs_info->balance_cancel_req)) |
3296 | bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; | |
837d5b6e | 3297 | |
c9e9f97b ID |
3298 | memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); |
3299 | memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); | |
3300 | memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); | |
19a39dce ID |
3301 | |
3302 | if (lock) { | |
3303 | spin_lock(&fs_info->balance_lock); | |
3304 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
3305 | spin_unlock(&fs_info->balance_lock); | |
3306 | } else { | |
3307 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
3308 | } | |
c9e9f97b ID |
3309 | } |
3310 | ||
9ba1f6e4 | 3311 | static long btrfs_ioctl_balance(struct file *file, void __user *arg) |
c9e9f97b | 3312 | { |
9ba1f6e4 | 3313 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
c9e9f97b ID |
3314 | struct btrfs_fs_info *fs_info = root->fs_info; |
3315 | struct btrfs_ioctl_balance_args *bargs; | |
3316 | struct btrfs_balance_control *bctl; | |
3317 | int ret; | |
3318 | ||
3319 | if (!capable(CAP_SYS_ADMIN)) | |
3320 | return -EPERM; | |
3321 | ||
e54bfa31 | 3322 | ret = mnt_want_write_file(file); |
9ba1f6e4 LB |
3323 | if (ret) |
3324 | return ret; | |
3325 | ||
c9e9f97b ID |
3326 | mutex_lock(&fs_info->volume_mutex); |
3327 | mutex_lock(&fs_info->balance_mutex); | |
3328 | ||
3329 | if (arg) { | |
3330 | bargs = memdup_user(arg, sizeof(*bargs)); | |
3331 | if (IS_ERR(bargs)) { | |
3332 | ret = PTR_ERR(bargs); | |
3333 | goto out; | |
3334 | } | |
de322263 ID |
3335 | |
3336 | if (bargs->flags & BTRFS_BALANCE_RESUME) { | |
3337 | if (!fs_info->balance_ctl) { | |
3338 | ret = -ENOTCONN; | |
3339 | goto out_bargs; | |
3340 | } | |
3341 | ||
3342 | bctl = fs_info->balance_ctl; | |
3343 | spin_lock(&fs_info->balance_lock); | |
3344 | bctl->flags |= BTRFS_BALANCE_RESUME; | |
3345 | spin_unlock(&fs_info->balance_lock); | |
3346 | ||
3347 | goto do_balance; | |
3348 | } | |
c9e9f97b ID |
3349 | } else { |
3350 | bargs = NULL; | |
3351 | } | |
3352 | ||
837d5b6e ID |
3353 | if (fs_info->balance_ctl) { |
3354 | ret = -EINPROGRESS; | |
3355 | goto out_bargs; | |
3356 | } | |
3357 | ||
c9e9f97b ID |
3358 | bctl = kzalloc(sizeof(*bctl), GFP_NOFS); |
3359 | if (!bctl) { | |
3360 | ret = -ENOMEM; | |
3361 | goto out_bargs; | |
3362 | } | |
3363 | ||
3364 | bctl->fs_info = fs_info; | |
3365 | if (arg) { | |
3366 | memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); | |
3367 | memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); | |
3368 | memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); | |
3369 | ||
3370 | bctl->flags = bargs->flags; | |
f43ffb60 ID |
3371 | } else { |
3372 | /* balance everything - no filters */ | |
3373 | bctl->flags |= BTRFS_BALANCE_TYPE_MASK; | |
c9e9f97b ID |
3374 | } |
3375 | ||
de322263 | 3376 | do_balance: |
c9e9f97b ID |
3377 | ret = btrfs_balance(bctl, bargs); |
3378 | /* | |
837d5b6e ID |
3379 | * bctl is freed in __cancel_balance or in free_fs_info if |
3380 | * restriper was paused all the way until unmount | |
c9e9f97b ID |
3381 | */ |
3382 | if (arg) { | |
3383 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
3384 | ret = -EFAULT; | |
3385 | } | |
3386 | ||
3387 | out_bargs: | |
3388 | kfree(bargs); | |
3389 | out: | |
3390 | mutex_unlock(&fs_info->balance_mutex); | |
3391 | mutex_unlock(&fs_info->volume_mutex); | |
e54bfa31 | 3392 | mnt_drop_write_file(file); |
c9e9f97b ID |
3393 | return ret; |
3394 | } | |
3395 | ||
837d5b6e ID |
3396 | static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) |
3397 | { | |
3398 | if (!capable(CAP_SYS_ADMIN)) | |
3399 | return -EPERM; | |
3400 | ||
3401 | switch (cmd) { | |
3402 | case BTRFS_BALANCE_CTL_PAUSE: | |
3403 | return btrfs_pause_balance(root->fs_info); | |
a7e99c69 ID |
3404 | case BTRFS_BALANCE_CTL_CANCEL: |
3405 | return btrfs_cancel_balance(root->fs_info); | |
837d5b6e ID |
3406 | } |
3407 | ||
3408 | return -EINVAL; | |
3409 | } | |
3410 | ||
19a39dce ID |
3411 | static long btrfs_ioctl_balance_progress(struct btrfs_root *root, |
3412 | void __user *arg) | |
3413 | { | |
3414 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3415 | struct btrfs_ioctl_balance_args *bargs; | |
3416 | int ret = 0; | |
3417 | ||
3418 | if (!capable(CAP_SYS_ADMIN)) | |
3419 | return -EPERM; | |
3420 | ||
3421 | mutex_lock(&fs_info->balance_mutex); | |
3422 | if (!fs_info->balance_ctl) { | |
3423 | ret = -ENOTCONN; | |
3424 | goto out; | |
3425 | } | |
3426 | ||
3427 | bargs = kzalloc(sizeof(*bargs), GFP_NOFS); | |
3428 | if (!bargs) { | |
3429 | ret = -ENOMEM; | |
3430 | goto out; | |
3431 | } | |
3432 | ||
3433 | update_ioctl_balance_args(fs_info, 1, bargs); | |
3434 | ||
3435 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
3436 | ret = -EFAULT; | |
3437 | ||
3438 | kfree(bargs); | |
3439 | out: | |
3440 | mutex_unlock(&fs_info->balance_mutex); | |
3441 | return ret; | |
3442 | } | |
3443 | ||
5d13a37b AJ |
3444 | static long btrfs_ioctl_quota_ctl(struct btrfs_root *root, void __user *arg) |
3445 | { | |
3446 | struct btrfs_ioctl_quota_ctl_args *sa; | |
3447 | struct btrfs_trans_handle *trans = NULL; | |
3448 | int ret; | |
3449 | int err; | |
3450 | ||
3451 | if (!capable(CAP_SYS_ADMIN)) | |
3452 | return -EPERM; | |
3453 | ||
3454 | if (root->fs_info->sb->s_flags & MS_RDONLY) | |
3455 | return -EROFS; | |
3456 | ||
3457 | sa = memdup_user(arg, sizeof(*sa)); | |
3458 | if (IS_ERR(sa)) | |
3459 | return PTR_ERR(sa); | |
3460 | ||
3461 | if (sa->cmd != BTRFS_QUOTA_CTL_RESCAN) { | |
3462 | trans = btrfs_start_transaction(root, 2); | |
3463 | if (IS_ERR(trans)) { | |
3464 | ret = PTR_ERR(trans); | |
3465 | goto out; | |
3466 | } | |
3467 | } | |
3468 | ||
3469 | switch (sa->cmd) { | |
3470 | case BTRFS_QUOTA_CTL_ENABLE: | |
3471 | ret = btrfs_quota_enable(trans, root->fs_info); | |
3472 | break; | |
3473 | case BTRFS_QUOTA_CTL_DISABLE: | |
3474 | ret = btrfs_quota_disable(trans, root->fs_info); | |
3475 | break; | |
3476 | case BTRFS_QUOTA_CTL_RESCAN: | |
3477 | ret = btrfs_quota_rescan(root->fs_info); | |
3478 | break; | |
3479 | default: | |
3480 | ret = -EINVAL; | |
3481 | break; | |
3482 | } | |
3483 | ||
3484 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
3485 | ret = -EFAULT; | |
3486 | ||
3487 | if (trans) { | |
3488 | err = btrfs_commit_transaction(trans, root); | |
3489 | if (err && !ret) | |
3490 | ret = err; | |
3491 | } | |
3492 | ||
3493 | out: | |
3494 | kfree(sa); | |
3495 | return ret; | |
3496 | } | |
3497 | ||
3498 | static long btrfs_ioctl_qgroup_assign(struct btrfs_root *root, void __user *arg) | |
3499 | { | |
3500 | struct btrfs_ioctl_qgroup_assign_args *sa; | |
3501 | struct btrfs_trans_handle *trans; | |
3502 | int ret; | |
3503 | int err; | |
3504 | ||
3505 | if (!capable(CAP_SYS_ADMIN)) | |
3506 | return -EPERM; | |
3507 | ||
3508 | if (root->fs_info->sb->s_flags & MS_RDONLY) | |
3509 | return -EROFS; | |
3510 | ||
3511 | sa = memdup_user(arg, sizeof(*sa)); | |
3512 | if (IS_ERR(sa)) | |
3513 | return PTR_ERR(sa); | |
3514 | ||
3515 | trans = btrfs_join_transaction(root); | |
3516 | if (IS_ERR(trans)) { | |
3517 | ret = PTR_ERR(trans); | |
3518 | goto out; | |
3519 | } | |
3520 | ||
3521 | /* FIXME: check if the IDs really exist */ | |
3522 | if (sa->assign) { | |
3523 | ret = btrfs_add_qgroup_relation(trans, root->fs_info, | |
3524 | sa->src, sa->dst); | |
3525 | } else { | |
3526 | ret = btrfs_del_qgroup_relation(trans, root->fs_info, | |
3527 | sa->src, sa->dst); | |
3528 | } | |
3529 | ||
3530 | err = btrfs_end_transaction(trans, root); | |
3531 | if (err && !ret) | |
3532 | ret = err; | |
3533 | ||
3534 | out: | |
3535 | kfree(sa); | |
3536 | return ret; | |
3537 | } | |
3538 | ||
3539 | static long btrfs_ioctl_qgroup_create(struct btrfs_root *root, void __user *arg) | |
3540 | { | |
3541 | struct btrfs_ioctl_qgroup_create_args *sa; | |
3542 | struct btrfs_trans_handle *trans; | |
3543 | int ret; | |
3544 | int err; | |
3545 | ||
3546 | if (!capable(CAP_SYS_ADMIN)) | |
3547 | return -EPERM; | |
3548 | ||
3549 | if (root->fs_info->sb->s_flags & MS_RDONLY) | |
3550 | return -EROFS; | |
3551 | ||
3552 | sa = memdup_user(arg, sizeof(*sa)); | |
3553 | if (IS_ERR(sa)) | |
3554 | return PTR_ERR(sa); | |
3555 | ||
3556 | trans = btrfs_join_transaction(root); | |
3557 | if (IS_ERR(trans)) { | |
3558 | ret = PTR_ERR(trans); | |
3559 | goto out; | |
3560 | } | |
3561 | ||
3562 | /* FIXME: check if the IDs really exist */ | |
3563 | if (sa->create) { | |
3564 | ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, | |
3565 | NULL); | |
3566 | } else { | |
3567 | ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); | |
3568 | } | |
3569 | ||
3570 | err = btrfs_end_transaction(trans, root); | |
3571 | if (err && !ret) | |
3572 | ret = err; | |
3573 | ||
3574 | out: | |
3575 | kfree(sa); | |
3576 | return ret; | |
3577 | } | |
3578 | ||
3579 | static long btrfs_ioctl_qgroup_limit(struct btrfs_root *root, void __user *arg) | |
3580 | { | |
3581 | struct btrfs_ioctl_qgroup_limit_args *sa; | |
3582 | struct btrfs_trans_handle *trans; | |
3583 | int ret; | |
3584 | int err; | |
3585 | u64 qgroupid; | |
3586 | ||
3587 | if (!capable(CAP_SYS_ADMIN)) | |
3588 | return -EPERM; | |
3589 | ||
3590 | if (root->fs_info->sb->s_flags & MS_RDONLY) | |
3591 | return -EROFS; | |
3592 | ||
3593 | sa = memdup_user(arg, sizeof(*sa)); | |
3594 | if (IS_ERR(sa)) | |
3595 | return PTR_ERR(sa); | |
3596 | ||
3597 | trans = btrfs_join_transaction(root); | |
3598 | if (IS_ERR(trans)) { | |
3599 | ret = PTR_ERR(trans); | |
3600 | goto out; | |
3601 | } | |
3602 | ||
3603 | qgroupid = sa->qgroupid; | |
3604 | if (!qgroupid) { | |
3605 | /* take the current subvol as qgroup */ | |
3606 | qgroupid = root->root_key.objectid; | |
3607 | } | |
3608 | ||
3609 | /* FIXME: check if the IDs really exist */ | |
3610 | ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); | |
3611 | ||
3612 | err = btrfs_end_transaction(trans, root); | |
3613 | if (err && !ret) | |
3614 | ret = err; | |
3615 | ||
3616 | out: | |
3617 | kfree(sa); | |
3618 | return ret; | |
3619 | } | |
3620 | ||
8ea05e3a AB |
3621 | static long btrfs_ioctl_set_received_subvol(struct file *file, |
3622 | void __user *arg) | |
3623 | { | |
3624 | struct btrfs_ioctl_received_subvol_args *sa = NULL; | |
3625 | struct inode *inode = fdentry(file)->d_inode; | |
3626 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3627 | struct btrfs_root_item *root_item = &root->root_item; | |
3628 | struct btrfs_trans_handle *trans; | |
3629 | struct timespec ct = CURRENT_TIME; | |
3630 | int ret = 0; | |
3631 | ||
3632 | ret = mnt_want_write_file(file); | |
3633 | if (ret < 0) | |
3634 | return ret; | |
3635 | ||
3636 | down_write(&root->fs_info->subvol_sem); | |
3637 | ||
3638 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { | |
3639 | ret = -EINVAL; | |
3640 | goto out; | |
3641 | } | |
3642 | ||
3643 | if (btrfs_root_readonly(root)) { | |
3644 | ret = -EROFS; | |
3645 | goto out; | |
3646 | } | |
3647 | ||
3648 | if (!inode_owner_or_capable(inode)) { | |
3649 | ret = -EACCES; | |
3650 | goto out; | |
3651 | } | |
3652 | ||
3653 | sa = memdup_user(arg, sizeof(*sa)); | |
3654 | if (IS_ERR(sa)) { | |
3655 | ret = PTR_ERR(sa); | |
3656 | sa = NULL; | |
3657 | goto out; | |
3658 | } | |
3659 | ||
3660 | trans = btrfs_start_transaction(root, 1); | |
3661 | if (IS_ERR(trans)) { | |
3662 | ret = PTR_ERR(trans); | |
3663 | trans = NULL; | |
3664 | goto out; | |
3665 | } | |
3666 | ||
3667 | sa->rtransid = trans->transid; | |
3668 | sa->rtime.sec = ct.tv_sec; | |
3669 | sa->rtime.nsec = ct.tv_nsec; | |
3670 | ||
3671 | memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); | |
3672 | btrfs_set_root_stransid(root_item, sa->stransid); | |
3673 | btrfs_set_root_rtransid(root_item, sa->rtransid); | |
3674 | root_item->stime.sec = cpu_to_le64(sa->stime.sec); | |
3675 | root_item->stime.nsec = cpu_to_le32(sa->stime.nsec); | |
3676 | root_item->rtime.sec = cpu_to_le64(sa->rtime.sec); | |
3677 | root_item->rtime.nsec = cpu_to_le32(sa->rtime.nsec); | |
3678 | ||
3679 | ret = btrfs_update_root(trans, root->fs_info->tree_root, | |
3680 | &root->root_key, &root->root_item); | |
3681 | if (ret < 0) { | |
3682 | btrfs_end_transaction(trans, root); | |
3683 | trans = NULL; | |
3684 | goto out; | |
3685 | } else { | |
3686 | ret = btrfs_commit_transaction(trans, root); | |
3687 | if (ret < 0) | |
3688 | goto out; | |
3689 | } | |
3690 | ||
3691 | ret = copy_to_user(arg, sa, sizeof(*sa)); | |
3692 | if (ret) | |
3693 | ret = -EFAULT; | |
3694 | ||
3695 | out: | |
3696 | kfree(sa); | |
3697 | up_write(&root->fs_info->subvol_sem); | |
3698 | mnt_drop_write_file(file); | |
3699 | return ret; | |
3700 | } | |
3701 | ||
f46b5a66 CH |
3702 | long btrfs_ioctl(struct file *file, unsigned int |
3703 | cmd, unsigned long arg) | |
3704 | { | |
3705 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; | |
4bcabaa3 | 3706 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
3707 | |
3708 | switch (cmd) { | |
6cbff00f CH |
3709 | case FS_IOC_GETFLAGS: |
3710 | return btrfs_ioctl_getflags(file, argp); | |
3711 | case FS_IOC_SETFLAGS: | |
3712 | return btrfs_ioctl_setflags(file, argp); | |
3713 | case FS_IOC_GETVERSION: | |
3714 | return btrfs_ioctl_getversion(file, argp); | |
f7039b1d LD |
3715 | case FITRIM: |
3716 | return btrfs_ioctl_fitrim(file, argp); | |
f46b5a66 | 3717 | case BTRFS_IOC_SNAP_CREATE: |
fa0d2b9b | 3718 | return btrfs_ioctl_snap_create(file, argp, 0); |
fdfb1e4f | 3719 | case BTRFS_IOC_SNAP_CREATE_V2: |
fa0d2b9b | 3720 | return btrfs_ioctl_snap_create_v2(file, argp, 0); |
3de4586c | 3721 | case BTRFS_IOC_SUBVOL_CREATE: |
fa0d2b9b | 3722 | return btrfs_ioctl_snap_create(file, argp, 1); |
6f72c7e2 AJ |
3723 | case BTRFS_IOC_SUBVOL_CREATE_V2: |
3724 | return btrfs_ioctl_snap_create_v2(file, argp, 1); | |
76dda93c YZ |
3725 | case BTRFS_IOC_SNAP_DESTROY: |
3726 | return btrfs_ioctl_snap_destroy(file, argp); | |
0caa102d LZ |
3727 | case BTRFS_IOC_SUBVOL_GETFLAGS: |
3728 | return btrfs_ioctl_subvol_getflags(file, argp); | |
3729 | case BTRFS_IOC_SUBVOL_SETFLAGS: | |
3730 | return btrfs_ioctl_subvol_setflags(file, argp); | |
6ef5ed0d JB |
3731 | case BTRFS_IOC_DEFAULT_SUBVOL: |
3732 | return btrfs_ioctl_default_subvol(file, argp); | |
f46b5a66 | 3733 | case BTRFS_IOC_DEFRAG: |
1e701a32 CM |
3734 | return btrfs_ioctl_defrag(file, NULL); |
3735 | case BTRFS_IOC_DEFRAG_RANGE: | |
3736 | return btrfs_ioctl_defrag(file, argp); | |
f46b5a66 | 3737 | case BTRFS_IOC_RESIZE: |
4bcabaa3 | 3738 | return btrfs_ioctl_resize(root, argp); |
f46b5a66 | 3739 | case BTRFS_IOC_ADD_DEV: |
4bcabaa3 | 3740 | return btrfs_ioctl_add_dev(root, argp); |
f46b5a66 | 3741 | case BTRFS_IOC_RM_DEV: |
4bcabaa3 | 3742 | return btrfs_ioctl_rm_dev(root, argp); |
475f6387 JS |
3743 | case BTRFS_IOC_FS_INFO: |
3744 | return btrfs_ioctl_fs_info(root, argp); | |
3745 | case BTRFS_IOC_DEV_INFO: | |
3746 | return btrfs_ioctl_dev_info(root, argp); | |
f46b5a66 | 3747 | case BTRFS_IOC_BALANCE: |
9ba1f6e4 | 3748 | return btrfs_ioctl_balance(file, NULL); |
f46b5a66 | 3749 | case BTRFS_IOC_CLONE: |
c5c9cd4d SW |
3750 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
3751 | case BTRFS_IOC_CLONE_RANGE: | |
7a865e8a | 3752 | return btrfs_ioctl_clone_range(file, argp); |
f46b5a66 CH |
3753 | case BTRFS_IOC_TRANS_START: |
3754 | return btrfs_ioctl_trans_start(file); | |
3755 | case BTRFS_IOC_TRANS_END: | |
3756 | return btrfs_ioctl_trans_end(file); | |
ac8e9819 CM |
3757 | case BTRFS_IOC_TREE_SEARCH: |
3758 | return btrfs_ioctl_tree_search(file, argp); | |
3759 | case BTRFS_IOC_INO_LOOKUP: | |
3760 | return btrfs_ioctl_ino_lookup(file, argp); | |
d7728c96 JS |
3761 | case BTRFS_IOC_INO_PATHS: |
3762 | return btrfs_ioctl_ino_to_path(root, argp); | |
3763 | case BTRFS_IOC_LOGICAL_INO: | |
3764 | return btrfs_ioctl_logical_to_ino(root, argp); | |
1406e432 JB |
3765 | case BTRFS_IOC_SPACE_INFO: |
3766 | return btrfs_ioctl_space_info(root, argp); | |
f46b5a66 CH |
3767 | case BTRFS_IOC_SYNC: |
3768 | btrfs_sync_fs(file->f_dentry->d_sb, 1); | |
3769 | return 0; | |
46204592 SW |
3770 | case BTRFS_IOC_START_SYNC: |
3771 | return btrfs_ioctl_start_sync(file, argp); | |
3772 | case BTRFS_IOC_WAIT_SYNC: | |
3773 | return btrfs_ioctl_wait_sync(file, argp); | |
475f6387 JS |
3774 | case BTRFS_IOC_SCRUB: |
3775 | return btrfs_ioctl_scrub(root, argp); | |
3776 | case BTRFS_IOC_SCRUB_CANCEL: | |
3777 | return btrfs_ioctl_scrub_cancel(root, argp); | |
3778 | case BTRFS_IOC_SCRUB_PROGRESS: | |
3779 | return btrfs_ioctl_scrub_progress(root, argp); | |
c9e9f97b | 3780 | case BTRFS_IOC_BALANCE_V2: |
9ba1f6e4 | 3781 | return btrfs_ioctl_balance(file, argp); |
837d5b6e ID |
3782 | case BTRFS_IOC_BALANCE_CTL: |
3783 | return btrfs_ioctl_balance_ctl(root, arg); | |
19a39dce ID |
3784 | case BTRFS_IOC_BALANCE_PROGRESS: |
3785 | return btrfs_ioctl_balance_progress(root, argp); | |
8ea05e3a AB |
3786 | case BTRFS_IOC_SET_RECEIVED_SUBVOL: |
3787 | return btrfs_ioctl_set_received_subvol(file, argp); | |
31db9f7c AB |
3788 | case BTRFS_IOC_SEND: |
3789 | return btrfs_ioctl_send(file, argp); | |
c11d2c23 | 3790 | case BTRFS_IOC_GET_DEV_STATS: |
b27f7c0c | 3791 | return btrfs_ioctl_get_dev_stats(root, argp); |
5d13a37b AJ |
3792 | case BTRFS_IOC_QUOTA_CTL: |
3793 | return btrfs_ioctl_quota_ctl(root, argp); | |
3794 | case BTRFS_IOC_QGROUP_ASSIGN: | |
3795 | return btrfs_ioctl_qgroup_assign(root, argp); | |
3796 | case BTRFS_IOC_QGROUP_CREATE: | |
3797 | return btrfs_ioctl_qgroup_create(root, argp); | |
3798 | case BTRFS_IOC_QGROUP_LIMIT: | |
3799 | return btrfs_ioctl_qgroup_limit(root, argp); | |
f46b5a66 CH |
3800 | } |
3801 | ||
3802 | return -ENOTTY; | |
3803 | } |