Commit | Line | Data |
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f46b5a66 CH |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/bio.h> | |
21 | #include <linux/buffer_head.h> | |
22 | #include <linux/file.h> | |
23 | #include <linux/fs.h> | |
cb8e7090 | 24 | #include <linux/fsnotify.h> |
f46b5a66 CH |
25 | #include <linux/pagemap.h> |
26 | #include <linux/highmem.h> | |
27 | #include <linux/time.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/string.h> | |
f46b5a66 | 30 | #include <linux/backing-dev.h> |
cb8e7090 | 31 | #include <linux/mount.h> |
f46b5a66 | 32 | #include <linux/mpage.h> |
cb8e7090 | 33 | #include <linux/namei.h> |
f46b5a66 CH |
34 | #include <linux/swap.h> |
35 | #include <linux/writeback.h> | |
36 | #include <linux/statfs.h> | |
37 | #include <linux/compat.h> | |
38 | #include <linux/bit_spinlock.h> | |
cb8e7090 | 39 | #include <linux/security.h> |
f46b5a66 | 40 | #include <linux/xattr.h> |
7ea394f1 | 41 | #include <linux/vmalloc.h> |
5a0e3ad6 | 42 | #include <linux/slab.h> |
f7039b1d | 43 | #include <linux/blkdev.h> |
8ea05e3a | 44 | #include <linux/uuid.h> |
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" |
3f6bcfbd | 58 | #include "dev-replace.h" |
f46b5a66 | 59 | |
6cbff00f CH |
60 | /* Mask out flags that are inappropriate for the given type of inode. */ |
61 | static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) | |
62 | { | |
63 | if (S_ISDIR(mode)) | |
64 | return flags; | |
65 | else if (S_ISREG(mode)) | |
66 | return flags & ~FS_DIRSYNC_FL; | |
67 | else | |
68 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); | |
69 | } | |
70 | ||
71 | /* | |
72 | * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. | |
73 | */ | |
74 | static unsigned int btrfs_flags_to_ioctl(unsigned int flags) | |
75 | { | |
76 | unsigned int iflags = 0; | |
77 | ||
78 | if (flags & BTRFS_INODE_SYNC) | |
79 | iflags |= FS_SYNC_FL; | |
80 | if (flags & BTRFS_INODE_IMMUTABLE) | |
81 | iflags |= FS_IMMUTABLE_FL; | |
82 | if (flags & BTRFS_INODE_APPEND) | |
83 | iflags |= FS_APPEND_FL; | |
84 | if (flags & BTRFS_INODE_NODUMP) | |
85 | iflags |= FS_NODUMP_FL; | |
86 | if (flags & BTRFS_INODE_NOATIME) | |
87 | iflags |= FS_NOATIME_FL; | |
88 | if (flags & BTRFS_INODE_DIRSYNC) | |
89 | iflags |= FS_DIRSYNC_FL; | |
d0092bdd LZ |
90 | if (flags & BTRFS_INODE_NODATACOW) |
91 | iflags |= FS_NOCOW_FL; | |
92 | ||
93 | if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) | |
94 | iflags |= FS_COMPR_FL; | |
95 | else if (flags & BTRFS_INODE_NOCOMPRESS) | |
96 | iflags |= FS_NOCOMP_FL; | |
6cbff00f CH |
97 | |
98 | return iflags; | |
99 | } | |
100 | ||
101 | /* | |
102 | * Update inode->i_flags based on the btrfs internal flags. | |
103 | */ | |
104 | void btrfs_update_iflags(struct inode *inode) | |
105 | { | |
106 | struct btrfs_inode *ip = BTRFS_I(inode); | |
107 | ||
108 | inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
109 | ||
110 | if (ip->flags & BTRFS_INODE_SYNC) | |
111 | inode->i_flags |= S_SYNC; | |
112 | if (ip->flags & BTRFS_INODE_IMMUTABLE) | |
113 | inode->i_flags |= S_IMMUTABLE; | |
114 | if (ip->flags & BTRFS_INODE_APPEND) | |
115 | inode->i_flags |= S_APPEND; | |
116 | if (ip->flags & BTRFS_INODE_NOATIME) | |
117 | inode->i_flags |= S_NOATIME; | |
118 | if (ip->flags & BTRFS_INODE_DIRSYNC) | |
119 | inode->i_flags |= S_DIRSYNC; | |
120 | } | |
121 | ||
122 | /* | |
123 | * Inherit flags from the parent inode. | |
124 | * | |
e27425d6 | 125 | * Currently only the compression flags and the cow flags are inherited. |
6cbff00f CH |
126 | */ |
127 | void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) | |
128 | { | |
0b4dcea5 CM |
129 | unsigned int flags; |
130 | ||
131 | if (!dir) | |
132 | return; | |
133 | ||
134 | flags = BTRFS_I(dir)->flags; | |
6cbff00f | 135 | |
e27425d6 JB |
136 | if (flags & BTRFS_INODE_NOCOMPRESS) { |
137 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; | |
138 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; | |
139 | } else if (flags & BTRFS_INODE_COMPRESS) { | |
140 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
141 | BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; | |
142 | } | |
143 | ||
144 | if (flags & BTRFS_INODE_NODATACOW) | |
145 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; | |
6cbff00f | 146 | |
6cbff00f CH |
147 | btrfs_update_iflags(inode); |
148 | } | |
149 | ||
150 | static int btrfs_ioctl_getflags(struct file *file, void __user *arg) | |
151 | { | |
152 | struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); | |
153 | unsigned int flags = btrfs_flags_to_ioctl(ip->flags); | |
154 | ||
155 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
156 | return -EFAULT; | |
157 | return 0; | |
158 | } | |
159 | ||
75e7cb7f LB |
160 | static int check_flags(unsigned int flags) |
161 | { | |
162 | if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ | |
163 | FS_NOATIME_FL | FS_NODUMP_FL | \ | |
164 | FS_SYNC_FL | FS_DIRSYNC_FL | \ | |
e1e8fb6a LZ |
165 | FS_NOCOMP_FL | FS_COMPR_FL | |
166 | FS_NOCOW_FL)) | |
75e7cb7f LB |
167 | return -EOPNOTSUPP; |
168 | ||
169 | if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) | |
170 | return -EINVAL; | |
171 | ||
75e7cb7f LB |
172 | return 0; |
173 | } | |
174 | ||
6cbff00f CH |
175 | static int btrfs_ioctl_setflags(struct file *file, void __user *arg) |
176 | { | |
177 | struct inode *inode = file->f_path.dentry->d_inode; | |
178 | struct btrfs_inode *ip = BTRFS_I(inode); | |
179 | struct btrfs_root *root = ip->root; | |
180 | struct btrfs_trans_handle *trans; | |
181 | unsigned int flags, oldflags; | |
182 | int ret; | |
f062abf0 LZ |
183 | u64 ip_oldflags; |
184 | unsigned int i_oldflags; | |
7e97b8da | 185 | umode_t mode; |
6cbff00f | 186 | |
b83cc969 LZ |
187 | if (btrfs_root_readonly(root)) |
188 | return -EROFS; | |
189 | ||
6cbff00f CH |
190 | if (copy_from_user(&flags, arg, sizeof(flags))) |
191 | return -EFAULT; | |
192 | ||
75e7cb7f LB |
193 | ret = check_flags(flags); |
194 | if (ret) | |
195 | return ret; | |
f46b5a66 | 196 | |
2e149670 | 197 | if (!inode_owner_or_capable(inode)) |
6cbff00f CH |
198 | return -EACCES; |
199 | ||
e7848683 JK |
200 | ret = mnt_want_write_file(file); |
201 | if (ret) | |
202 | return ret; | |
203 | ||
6cbff00f CH |
204 | mutex_lock(&inode->i_mutex); |
205 | ||
f062abf0 LZ |
206 | ip_oldflags = ip->flags; |
207 | i_oldflags = inode->i_flags; | |
7e97b8da | 208 | mode = inode->i_mode; |
f062abf0 | 209 | |
6cbff00f CH |
210 | flags = btrfs_mask_flags(inode->i_mode, flags); |
211 | oldflags = btrfs_flags_to_ioctl(ip->flags); | |
212 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { | |
213 | if (!capable(CAP_LINUX_IMMUTABLE)) { | |
214 | ret = -EPERM; | |
215 | goto out_unlock; | |
216 | } | |
217 | } | |
218 | ||
6cbff00f CH |
219 | if (flags & FS_SYNC_FL) |
220 | ip->flags |= BTRFS_INODE_SYNC; | |
221 | else | |
222 | ip->flags &= ~BTRFS_INODE_SYNC; | |
223 | if (flags & FS_IMMUTABLE_FL) | |
224 | ip->flags |= BTRFS_INODE_IMMUTABLE; | |
225 | else | |
226 | ip->flags &= ~BTRFS_INODE_IMMUTABLE; | |
227 | if (flags & FS_APPEND_FL) | |
228 | ip->flags |= BTRFS_INODE_APPEND; | |
229 | else | |
230 | ip->flags &= ~BTRFS_INODE_APPEND; | |
231 | if (flags & FS_NODUMP_FL) | |
232 | ip->flags |= BTRFS_INODE_NODUMP; | |
233 | else | |
234 | ip->flags &= ~BTRFS_INODE_NODUMP; | |
235 | if (flags & FS_NOATIME_FL) | |
236 | ip->flags |= BTRFS_INODE_NOATIME; | |
237 | else | |
238 | ip->flags &= ~BTRFS_INODE_NOATIME; | |
239 | if (flags & FS_DIRSYNC_FL) | |
240 | ip->flags |= BTRFS_INODE_DIRSYNC; | |
241 | else | |
242 | ip->flags &= ~BTRFS_INODE_DIRSYNC; | |
7e97b8da DS |
243 | if (flags & FS_NOCOW_FL) { |
244 | if (S_ISREG(mode)) { | |
245 | /* | |
246 | * It's safe to turn csums off here, no extents exist. | |
247 | * Otherwise we want the flag to reflect the real COW | |
248 | * status of the file and will not set it. | |
249 | */ | |
250 | if (inode->i_size == 0) | |
251 | ip->flags |= BTRFS_INODE_NODATACOW | |
252 | | BTRFS_INODE_NODATASUM; | |
253 | } else { | |
254 | ip->flags |= BTRFS_INODE_NODATACOW; | |
255 | } | |
256 | } else { | |
257 | /* | |
258 | * Revert back under same assuptions as above | |
259 | */ | |
260 | if (S_ISREG(mode)) { | |
261 | if (inode->i_size == 0) | |
262 | ip->flags &= ~(BTRFS_INODE_NODATACOW | |
263 | | BTRFS_INODE_NODATASUM); | |
264 | } else { | |
265 | ip->flags &= ~BTRFS_INODE_NODATACOW; | |
266 | } | |
267 | } | |
6cbff00f | 268 | |
75e7cb7f LB |
269 | /* |
270 | * The COMPRESS flag can only be changed by users, while the NOCOMPRESS | |
271 | * flag may be changed automatically if compression code won't make | |
272 | * things smaller. | |
273 | */ | |
274 | if (flags & FS_NOCOMP_FL) { | |
275 | ip->flags &= ~BTRFS_INODE_COMPRESS; | |
276 | ip->flags |= BTRFS_INODE_NOCOMPRESS; | |
277 | } else if (flags & FS_COMPR_FL) { | |
278 | ip->flags |= BTRFS_INODE_COMPRESS; | |
279 | ip->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
ebcb904d LZ |
280 | } else { |
281 | ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); | |
75e7cb7f | 282 | } |
6cbff00f | 283 | |
4da6f1a3 | 284 | trans = btrfs_start_transaction(root, 1); |
f062abf0 LZ |
285 | if (IS_ERR(trans)) { |
286 | ret = PTR_ERR(trans); | |
287 | goto out_drop; | |
288 | } | |
6cbff00f | 289 | |
306424cc | 290 | btrfs_update_iflags(inode); |
0c4d2d95 | 291 | inode_inc_iversion(inode); |
306424cc | 292 | inode->i_ctime = CURRENT_TIME; |
6cbff00f | 293 | ret = btrfs_update_inode(trans, root, inode); |
6cbff00f | 294 | |
6cbff00f | 295 | btrfs_end_transaction(trans, root); |
f062abf0 LZ |
296 | out_drop: |
297 | if (ret) { | |
298 | ip->flags = ip_oldflags; | |
299 | inode->i_flags = i_oldflags; | |
300 | } | |
6cbff00f | 301 | |
6cbff00f CH |
302 | out_unlock: |
303 | mutex_unlock(&inode->i_mutex); | |
e7848683 | 304 | mnt_drop_write_file(file); |
2d4e6f6a | 305 | return ret; |
6cbff00f CH |
306 | } |
307 | ||
308 | static int btrfs_ioctl_getversion(struct file *file, int __user *arg) | |
309 | { | |
310 | struct inode *inode = file->f_path.dentry->d_inode; | |
311 | ||
312 | return put_user(inode->i_generation, arg); | |
313 | } | |
f46b5a66 | 314 | |
f7039b1d LD |
315 | static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) |
316 | { | |
815745cf | 317 | struct btrfs_fs_info *fs_info = btrfs_sb(fdentry(file)->d_sb); |
f7039b1d LD |
318 | struct btrfs_device *device; |
319 | struct request_queue *q; | |
320 | struct fstrim_range range; | |
321 | u64 minlen = ULLONG_MAX; | |
322 | u64 num_devices = 0; | |
815745cf | 323 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
f7039b1d LD |
324 | int ret; |
325 | ||
326 | if (!capable(CAP_SYS_ADMIN)) | |
327 | return -EPERM; | |
328 | ||
1f78160c XG |
329 | rcu_read_lock(); |
330 | list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, | |
331 | dev_list) { | |
f7039b1d LD |
332 | if (!device->bdev) |
333 | continue; | |
334 | q = bdev_get_queue(device->bdev); | |
335 | if (blk_queue_discard(q)) { | |
336 | num_devices++; | |
337 | minlen = min((u64)q->limits.discard_granularity, | |
338 | minlen); | |
339 | } | |
340 | } | |
1f78160c | 341 | rcu_read_unlock(); |
f4c697e6 | 342 | |
f7039b1d LD |
343 | if (!num_devices) |
344 | return -EOPNOTSUPP; | |
f7039b1d LD |
345 | if (copy_from_user(&range, arg, sizeof(range))) |
346 | return -EFAULT; | |
e515c18b LC |
347 | if (range.start > total_bytes || |
348 | range.len < fs_info->sb->s_blocksize) | |
f4c697e6 | 349 | return -EINVAL; |
f7039b1d | 350 | |
f4c697e6 | 351 | range.len = min(range.len, total_bytes - range.start); |
f7039b1d | 352 | range.minlen = max(range.minlen, minlen); |
815745cf | 353 | ret = btrfs_trim_fs(fs_info->tree_root, &range); |
f7039b1d LD |
354 | if (ret < 0) |
355 | return ret; | |
356 | ||
357 | if (copy_to_user(arg, &range, sizeof(range))) | |
358 | return -EFAULT; | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
cb8e7090 CH |
363 | static noinline int create_subvol(struct btrfs_root *root, |
364 | struct dentry *dentry, | |
72fd032e | 365 | char *name, int namelen, |
6f72c7e2 AJ |
366 | u64 *async_transid, |
367 | struct btrfs_qgroup_inherit **inherit) | |
f46b5a66 CH |
368 | { |
369 | struct btrfs_trans_handle *trans; | |
370 | struct btrfs_key key; | |
371 | struct btrfs_root_item root_item; | |
372 | struct btrfs_inode_item *inode_item; | |
373 | struct extent_buffer *leaf; | |
76dda93c | 374 | struct btrfs_root *new_root; |
2fbe8c8a | 375 | struct dentry *parent = dentry->d_parent; |
6a912213 | 376 | struct inode *dir; |
8ea05e3a | 377 | struct timespec cur_time = CURRENT_TIME; |
f46b5a66 CH |
378 | int ret; |
379 | int err; | |
380 | u64 objectid; | |
381 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
3de4586c | 382 | u64 index = 0; |
8ea05e3a | 383 | uuid_le new_uuid; |
f46b5a66 | 384 | |
581bb050 | 385 | ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); |
2fbe8c8a | 386 | if (ret) |
a22285a6 | 387 | return ret; |
6a912213 JB |
388 | |
389 | dir = parent->d_inode; | |
390 | ||
9ed74f2d JB |
391 | /* |
392 | * 1 - inode item | |
393 | * 2 - refs | |
394 | * 1 - root item | |
395 | * 2 - dir items | |
396 | */ | |
a22285a6 | 397 | trans = btrfs_start_transaction(root, 6); |
2fbe8c8a | 398 | if (IS_ERR(trans)) |
a22285a6 | 399 | return PTR_ERR(trans); |
f46b5a66 | 400 | |
6f72c7e2 AJ |
401 | ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, |
402 | inherit ? *inherit : NULL); | |
403 | if (ret) | |
404 | goto fail; | |
405 | ||
5d4f98a2 | 406 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, |
5581a51a | 407 | 0, objectid, NULL, 0, 0, 0); |
8e8a1e31 JB |
408 | if (IS_ERR(leaf)) { |
409 | ret = PTR_ERR(leaf); | |
410 | goto fail; | |
411 | } | |
f46b5a66 | 412 | |
5d4f98a2 | 413 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
f46b5a66 CH |
414 | btrfs_set_header_bytenr(leaf, leaf->start); |
415 | btrfs_set_header_generation(leaf, trans->transid); | |
5d4f98a2 | 416 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); |
f46b5a66 CH |
417 | btrfs_set_header_owner(leaf, objectid); |
418 | ||
419 | write_extent_buffer(leaf, root->fs_info->fsid, | |
420 | (unsigned long)btrfs_header_fsid(leaf), | |
421 | BTRFS_FSID_SIZE); | |
5d4f98a2 YZ |
422 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, |
423 | (unsigned long)btrfs_header_chunk_tree_uuid(leaf), | |
424 | BTRFS_UUID_SIZE); | |
f46b5a66 CH |
425 | btrfs_mark_buffer_dirty(leaf); |
426 | ||
8ea05e3a AB |
427 | memset(&root_item, 0, sizeof(root_item)); |
428 | ||
f46b5a66 | 429 | inode_item = &root_item.inode; |
f46b5a66 CH |
430 | inode_item->generation = cpu_to_le64(1); |
431 | inode_item->size = cpu_to_le64(3); | |
432 | inode_item->nlink = cpu_to_le32(1); | |
a76a3cd4 | 433 | inode_item->nbytes = cpu_to_le64(root->leafsize); |
f46b5a66 CH |
434 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); |
435 | ||
08fe4db1 LZ |
436 | root_item.flags = 0; |
437 | root_item.byte_limit = 0; | |
438 | inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT); | |
439 | ||
f46b5a66 | 440 | btrfs_set_root_bytenr(&root_item, leaf->start); |
84234f3a | 441 | btrfs_set_root_generation(&root_item, trans->transid); |
f46b5a66 CH |
442 | btrfs_set_root_level(&root_item, 0); |
443 | btrfs_set_root_refs(&root_item, 1); | |
86b9f2ec | 444 | btrfs_set_root_used(&root_item, leaf->len); |
80ff3856 | 445 | btrfs_set_root_last_snapshot(&root_item, 0); |
f46b5a66 | 446 | |
8ea05e3a AB |
447 | btrfs_set_root_generation_v2(&root_item, |
448 | btrfs_root_generation(&root_item)); | |
449 | uuid_le_gen(&new_uuid); | |
450 | memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); | |
451 | root_item.otime.sec = cpu_to_le64(cur_time.tv_sec); | |
dadd1105 | 452 | root_item.otime.nsec = cpu_to_le32(cur_time.tv_nsec); |
8ea05e3a AB |
453 | root_item.ctime = root_item.otime; |
454 | btrfs_set_root_ctransid(&root_item, trans->transid); | |
455 | btrfs_set_root_otransid(&root_item, trans->transid); | |
f46b5a66 | 456 | |
925baedd | 457 | btrfs_tree_unlock(leaf); |
f46b5a66 CH |
458 | free_extent_buffer(leaf); |
459 | leaf = NULL; | |
460 | ||
461 | btrfs_set_root_dirid(&root_item, new_dirid); | |
462 | ||
463 | key.objectid = objectid; | |
5d4f98a2 | 464 | key.offset = 0; |
f46b5a66 CH |
465 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
466 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
467 | &root_item); | |
468 | if (ret) | |
469 | goto fail; | |
470 | ||
76dda93c YZ |
471 | key.offset = (u64)-1; |
472 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); | |
79787eaa JM |
473 | if (IS_ERR(new_root)) { |
474 | btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); | |
475 | ret = PTR_ERR(new_root); | |
476 | goto fail; | |
477 | } | |
76dda93c YZ |
478 | |
479 | btrfs_record_root_in_trans(trans, new_root); | |
480 | ||
d82a6f1d | 481 | ret = btrfs_create_subvol_root(trans, new_root, new_dirid); |
ce598979 MF |
482 | if (ret) { |
483 | /* We potentially lose an unused inode item here */ | |
79787eaa | 484 | btrfs_abort_transaction(trans, root, ret); |
ce598979 MF |
485 | goto fail; |
486 | } | |
487 | ||
f46b5a66 CH |
488 | /* |
489 | * insert the directory item | |
490 | */ | |
3de4586c | 491 | ret = btrfs_set_inode_index(dir, &index); |
79787eaa JM |
492 | if (ret) { |
493 | btrfs_abort_transaction(trans, root, ret); | |
494 | goto fail; | |
495 | } | |
3de4586c CM |
496 | |
497 | ret = btrfs_insert_dir_item(trans, root, | |
16cdcec7 | 498 | name, namelen, dir, &key, |
3de4586c | 499 | BTRFS_FT_DIR, index); |
79787eaa JM |
500 | if (ret) { |
501 | btrfs_abort_transaction(trans, root, ret); | |
f46b5a66 | 502 | goto fail; |
79787eaa | 503 | } |
0660b5af | 504 | |
52c26179 YZ |
505 | btrfs_i_size_write(dir, dir->i_size + namelen * 2); |
506 | ret = btrfs_update_inode(trans, root, dir); | |
507 | BUG_ON(ret); | |
508 | ||
0660b5af | 509 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
4df27c4d | 510 | objectid, root->root_key.objectid, |
33345d01 | 511 | btrfs_ino(dir), index, name, namelen); |
0660b5af | 512 | |
76dda93c | 513 | BUG_ON(ret); |
f46b5a66 | 514 | |
76dda93c | 515 | d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); |
f46b5a66 | 516 | fail: |
72fd032e SW |
517 | if (async_transid) { |
518 | *async_transid = trans->transid; | |
519 | err = btrfs_commit_transaction_async(trans, root, 1); | |
520 | } else { | |
521 | err = btrfs_commit_transaction(trans, root); | |
522 | } | |
f46b5a66 CH |
523 | if (err && !ret) |
524 | ret = err; | |
f46b5a66 CH |
525 | return ret; |
526 | } | |
527 | ||
72fd032e | 528 | static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, |
b83cc969 | 529 | char *name, int namelen, u64 *async_transid, |
6f72c7e2 | 530 | bool readonly, struct btrfs_qgroup_inherit **inherit) |
f46b5a66 | 531 | { |
2e4bfab9 | 532 | struct inode *inode; |
f46b5a66 CH |
533 | struct btrfs_pending_snapshot *pending_snapshot; |
534 | struct btrfs_trans_handle *trans; | |
2e4bfab9 | 535 | int ret; |
f46b5a66 CH |
536 | |
537 | if (!root->ref_cows) | |
538 | return -EINVAL; | |
539 | ||
3de4586c | 540 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
a22285a6 YZ |
541 | if (!pending_snapshot) |
542 | return -ENOMEM; | |
543 | ||
66d8f3dd MX |
544 | btrfs_init_block_rsv(&pending_snapshot->block_rsv, |
545 | BTRFS_BLOCK_RSV_TEMP); | |
3de4586c | 546 | pending_snapshot->dentry = dentry; |
f46b5a66 | 547 | pending_snapshot->root = root; |
b83cc969 | 548 | pending_snapshot->readonly = readonly; |
6f72c7e2 AJ |
549 | if (inherit) { |
550 | pending_snapshot->inherit = *inherit; | |
551 | *inherit = NULL; /* take responsibility to free it */ | |
552 | } | |
a22285a6 | 553 | |
48c03c4b | 554 | trans = btrfs_start_transaction(root->fs_info->extent_root, 6); |
a22285a6 YZ |
555 | if (IS_ERR(trans)) { |
556 | ret = PTR_ERR(trans); | |
557 | goto fail; | |
558 | } | |
559 | ||
560 | ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); | |
561 | BUG_ON(ret); | |
562 | ||
8351583e | 563 | spin_lock(&root->fs_info->trans_lock); |
f46b5a66 CH |
564 | list_add(&pending_snapshot->list, |
565 | &trans->transaction->pending_snapshots); | |
8351583e | 566 | spin_unlock(&root->fs_info->trans_lock); |
72fd032e SW |
567 | if (async_transid) { |
568 | *async_transid = trans->transid; | |
569 | ret = btrfs_commit_transaction_async(trans, | |
570 | root->fs_info->extent_root, 1); | |
571 | } else { | |
572 | ret = btrfs_commit_transaction(trans, | |
573 | root->fs_info->extent_root); | |
574 | } | |
109f2365 LB |
575 | if (ret) { |
576 | /* cleanup_transaction has freed this for us */ | |
577 | if (trans->aborted) | |
578 | pending_snapshot = NULL; | |
c37b2b62 | 579 | goto fail; |
109f2365 | 580 | } |
a22285a6 YZ |
581 | |
582 | ret = pending_snapshot->error; | |
583 | if (ret) | |
584 | goto fail; | |
585 | ||
66b4ffd1 JB |
586 | ret = btrfs_orphan_cleanup(pending_snapshot->snap); |
587 | if (ret) | |
588 | goto fail; | |
f46b5a66 | 589 | |
2fbe8c8a | 590 | inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); |
2e4bfab9 YZ |
591 | if (IS_ERR(inode)) { |
592 | ret = PTR_ERR(inode); | |
593 | goto fail; | |
594 | } | |
595 | BUG_ON(!inode); | |
596 | d_instantiate(dentry, inode); | |
597 | ret = 0; | |
598 | fail: | |
a22285a6 | 599 | kfree(pending_snapshot); |
f46b5a66 CH |
600 | return ret; |
601 | } | |
602 | ||
4260f7c7 SW |
603 | /* copy of check_sticky in fs/namei.c() |
604 | * It's inline, so penalty for filesystems that don't use sticky bit is | |
605 | * minimal. | |
606 | */ | |
607 | static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) | |
608 | { | |
2f2f43d3 | 609 | kuid_t fsuid = current_fsuid(); |
4260f7c7 SW |
610 | |
611 | if (!(dir->i_mode & S_ISVTX)) | |
612 | return 0; | |
2f2f43d3 | 613 | if (uid_eq(inode->i_uid, fsuid)) |
4260f7c7 | 614 | return 0; |
2f2f43d3 | 615 | if (uid_eq(dir->i_uid, fsuid)) |
4260f7c7 SW |
616 | return 0; |
617 | return !capable(CAP_FOWNER); | |
618 | } | |
619 | ||
620 | /* copy of may_delete in fs/namei.c() | |
621 | * Check whether we can remove a link victim from directory dir, check | |
622 | * whether the type of victim is right. | |
623 | * 1. We can't do it if dir is read-only (done in permission()) | |
624 | * 2. We should have write and exec permissions on dir | |
625 | * 3. We can't remove anything from append-only dir | |
626 | * 4. We can't do anything with immutable dir (done in permission()) | |
627 | * 5. If the sticky bit on dir is set we should either | |
628 | * a. be owner of dir, or | |
629 | * b. be owner of victim, or | |
630 | * c. have CAP_FOWNER capability | |
631 | * 6. If the victim is append-only or immutable we can't do antyhing with | |
632 | * links pointing to it. | |
633 | * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. | |
634 | * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. | |
635 | * 9. We can't remove a root or mountpoint. | |
636 | * 10. We don't allow removal of NFS sillyrenamed files; it's handled by | |
637 | * nfs_async_unlink(). | |
638 | */ | |
639 | ||
640 | static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) | |
641 | { | |
642 | int error; | |
643 | ||
644 | if (!victim->d_inode) | |
645 | return -ENOENT; | |
646 | ||
647 | BUG_ON(victim->d_parent->d_inode != dir); | |
4fa6b5ec | 648 | audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); |
4260f7c7 SW |
649 | |
650 | error = inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
651 | if (error) | |
652 | return error; | |
653 | if (IS_APPEND(dir)) | |
654 | return -EPERM; | |
655 | if (btrfs_check_sticky(dir, victim->d_inode)|| | |
656 | IS_APPEND(victim->d_inode)|| | |
657 | IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) | |
658 | return -EPERM; | |
659 | if (isdir) { | |
660 | if (!S_ISDIR(victim->d_inode->i_mode)) | |
661 | return -ENOTDIR; | |
662 | if (IS_ROOT(victim)) | |
663 | return -EBUSY; | |
664 | } else if (S_ISDIR(victim->d_inode->i_mode)) | |
665 | return -EISDIR; | |
666 | if (IS_DEADDIR(dir)) | |
667 | return -ENOENT; | |
668 | if (victim->d_flags & DCACHE_NFSFS_RENAMED) | |
669 | return -EBUSY; | |
670 | return 0; | |
671 | } | |
672 | ||
cb8e7090 CH |
673 | /* copy of may_create in fs/namei.c() */ |
674 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
675 | { | |
676 | if (child->d_inode) | |
677 | return -EEXIST; | |
678 | if (IS_DEADDIR(dir)) | |
679 | return -ENOENT; | |
680 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
681 | } | |
682 | ||
683 | /* | |
684 | * Create a new subvolume below @parent. This is largely modeled after | |
685 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
686 | * inside this filesystem so it's quite a bit simpler. | |
687 | */ | |
76dda93c YZ |
688 | static noinline int btrfs_mksubvol(struct path *parent, |
689 | char *name, int namelen, | |
72fd032e | 690 | struct btrfs_root *snap_src, |
6f72c7e2 AJ |
691 | u64 *async_transid, bool readonly, |
692 | struct btrfs_qgroup_inherit **inherit) | |
cb8e7090 | 693 | { |
76dda93c | 694 | struct inode *dir = parent->dentry->d_inode; |
cb8e7090 CH |
695 | struct dentry *dentry; |
696 | int error; | |
697 | ||
76dda93c | 698 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
cb8e7090 CH |
699 | |
700 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
701 | error = PTR_ERR(dentry); | |
702 | if (IS_ERR(dentry)) | |
703 | goto out_unlock; | |
704 | ||
705 | error = -EEXIST; | |
706 | if (dentry->d_inode) | |
707 | goto out_dput; | |
708 | ||
76dda93c | 709 | error = btrfs_may_create(dir, dentry); |
cb8e7090 | 710 | if (error) |
a874a63e | 711 | goto out_dput; |
cb8e7090 | 712 | |
76dda93c YZ |
713 | down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); |
714 | ||
715 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) | |
716 | goto out_up_read; | |
717 | ||
3de4586c | 718 | if (snap_src) { |
6f72c7e2 AJ |
719 | error = create_snapshot(snap_src, dentry, name, namelen, |
720 | async_transid, readonly, inherit); | |
3de4586c | 721 | } else { |
76dda93c | 722 | error = create_subvol(BTRFS_I(dir)->root, dentry, |
6f72c7e2 | 723 | name, namelen, async_transid, inherit); |
3de4586c | 724 | } |
76dda93c YZ |
725 | if (!error) |
726 | fsnotify_mkdir(dir, dentry); | |
727 | out_up_read: | |
728 | up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); | |
cb8e7090 CH |
729 | out_dput: |
730 | dput(dentry); | |
731 | out_unlock: | |
76dda93c | 732 | mutex_unlock(&dir->i_mutex); |
cb8e7090 CH |
733 | return error; |
734 | } | |
735 | ||
4cb5300b CM |
736 | /* |
737 | * When we're defragging a range, we don't want to kick it off again | |
738 | * if it is really just waiting for delalloc to send it down. | |
739 | * If we find a nice big extent or delalloc range for the bytes in the | |
740 | * file you want to defrag, we return 0 to let you know to skip this | |
741 | * part of the file | |
742 | */ | |
743 | static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) | |
744 | { | |
745 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
746 | struct extent_map *em = NULL; | |
747 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
748 | u64 end; | |
749 | ||
750 | read_lock(&em_tree->lock); | |
751 | em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); | |
752 | read_unlock(&em_tree->lock); | |
753 | ||
754 | if (em) { | |
755 | end = extent_map_end(em); | |
756 | free_extent_map(em); | |
757 | if (end - offset > thresh) | |
758 | return 0; | |
759 | } | |
760 | /* if we already have a nice delalloc here, just stop */ | |
761 | thresh /= 2; | |
762 | end = count_range_bits(io_tree, &offset, offset + thresh, | |
763 | thresh, EXTENT_DELALLOC, 1); | |
764 | if (end >= thresh) | |
765 | return 0; | |
766 | return 1; | |
767 | } | |
768 | ||
769 | /* | |
770 | * helper function to walk through a file and find extents | |
771 | * newer than a specific transid, and smaller than thresh. | |
772 | * | |
773 | * This is used by the defragging code to find new and small | |
774 | * extents | |
775 | */ | |
776 | static int find_new_extents(struct btrfs_root *root, | |
777 | struct inode *inode, u64 newer_than, | |
778 | u64 *off, int thresh) | |
779 | { | |
780 | struct btrfs_path *path; | |
781 | struct btrfs_key min_key; | |
782 | struct btrfs_key max_key; | |
783 | struct extent_buffer *leaf; | |
784 | struct btrfs_file_extent_item *extent; | |
785 | int type; | |
786 | int ret; | |
a4689d2b | 787 | u64 ino = btrfs_ino(inode); |
4cb5300b CM |
788 | |
789 | path = btrfs_alloc_path(); | |
790 | if (!path) | |
791 | return -ENOMEM; | |
792 | ||
a4689d2b | 793 | min_key.objectid = ino; |
4cb5300b CM |
794 | min_key.type = BTRFS_EXTENT_DATA_KEY; |
795 | min_key.offset = *off; | |
796 | ||
a4689d2b | 797 | max_key.objectid = ino; |
4cb5300b CM |
798 | max_key.type = (u8)-1; |
799 | max_key.offset = (u64)-1; | |
800 | ||
801 | path->keep_locks = 1; | |
802 | ||
803 | while(1) { | |
804 | ret = btrfs_search_forward(root, &min_key, &max_key, | |
805 | path, 0, newer_than); | |
806 | if (ret != 0) | |
807 | goto none; | |
a4689d2b | 808 | if (min_key.objectid != ino) |
4cb5300b CM |
809 | goto none; |
810 | if (min_key.type != BTRFS_EXTENT_DATA_KEY) | |
811 | goto none; | |
812 | ||
813 | leaf = path->nodes[0]; | |
814 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
815 | struct btrfs_file_extent_item); | |
816 | ||
817 | type = btrfs_file_extent_type(leaf, extent); | |
818 | if (type == BTRFS_FILE_EXTENT_REG && | |
819 | btrfs_file_extent_num_bytes(leaf, extent) < thresh && | |
820 | check_defrag_in_cache(inode, min_key.offset, thresh)) { | |
821 | *off = min_key.offset; | |
822 | btrfs_free_path(path); | |
823 | return 0; | |
824 | } | |
825 | ||
826 | if (min_key.offset == (u64)-1) | |
827 | goto none; | |
828 | ||
829 | min_key.offset++; | |
830 | btrfs_release_path(path); | |
831 | } | |
832 | none: | |
833 | btrfs_free_path(path); | |
834 | return -ENOENT; | |
835 | } | |
836 | ||
6c282eb4 | 837 | static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) |
17ce6ef8 LB |
838 | { |
839 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
6c282eb4 LZ |
840 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
841 | struct extent_map *em; | |
842 | u64 len = PAGE_CACHE_SIZE; | |
17ce6ef8 | 843 | |
6c282eb4 LZ |
844 | /* |
845 | * hopefully we have this extent in the tree already, try without | |
846 | * the full extent lock | |
847 | */ | |
17ce6ef8 | 848 | read_lock(&em_tree->lock); |
6c282eb4 | 849 | em = lookup_extent_mapping(em_tree, start, len); |
17ce6ef8 LB |
850 | read_unlock(&em_tree->lock); |
851 | ||
6c282eb4 LZ |
852 | if (!em) { |
853 | /* get the big lock and read metadata off disk */ | |
854 | lock_extent(io_tree, start, start + len - 1); | |
855 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); | |
856 | unlock_extent(io_tree, start, start + len - 1); | |
857 | ||
858 | if (IS_ERR(em)) | |
859 | return NULL; | |
860 | } | |
861 | ||
862 | return em; | |
863 | } | |
17ce6ef8 | 864 | |
6c282eb4 LZ |
865 | static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) |
866 | { | |
867 | struct extent_map *next; | |
868 | bool ret = true; | |
869 | ||
870 | /* this is the last extent */ | |
871 | if (em->start + em->len >= i_size_read(inode)) | |
872 | return false; | |
873 | ||
874 | next = defrag_lookup_extent(inode, em->start + em->len); | |
875 | if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) | |
876 | ret = false; | |
877 | ||
878 | free_extent_map(next); | |
17ce6ef8 LB |
879 | return ret; |
880 | } | |
881 | ||
6c282eb4 | 882 | static int should_defrag_range(struct inode *inode, u64 start, int thresh, |
a43a2111 AM |
883 | u64 *last_len, u64 *skip, u64 *defrag_end, |
884 | int compress) | |
940100a4 | 885 | { |
6c282eb4 | 886 | struct extent_map *em; |
940100a4 | 887 | int ret = 1; |
6c282eb4 | 888 | bool next_mergeable = true; |
940100a4 CM |
889 | |
890 | /* | |
008873ea | 891 | * make sure that once we start defragging an extent, we keep on |
940100a4 CM |
892 | * defragging it |
893 | */ | |
894 | if (start < *defrag_end) | |
895 | return 1; | |
896 | ||
897 | *skip = 0; | |
898 | ||
6c282eb4 LZ |
899 | em = defrag_lookup_extent(inode, start); |
900 | if (!em) | |
901 | return 0; | |
940100a4 CM |
902 | |
903 | /* this will cover holes, and inline extents */ | |
17ce6ef8 | 904 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { |
940100a4 | 905 | ret = 0; |
17ce6ef8 LB |
906 | goto out; |
907 | } | |
908 | ||
6c282eb4 | 909 | next_mergeable = defrag_check_next_extent(inode, em); |
940100a4 CM |
910 | |
911 | /* | |
6c282eb4 LZ |
912 | * we hit a real extent, if it is big or the next extent is not a |
913 | * real extent, don't bother defragging it | |
940100a4 | 914 | */ |
a43a2111 | 915 | if (!compress && (*last_len == 0 || *last_len >= thresh) && |
6c282eb4 | 916 | (em->len >= thresh || !next_mergeable)) |
940100a4 | 917 | ret = 0; |
17ce6ef8 | 918 | out: |
940100a4 CM |
919 | /* |
920 | * last_len ends up being a counter of how many bytes we've defragged. | |
921 | * every time we choose not to defrag an extent, we reset *last_len | |
922 | * so that the next tiny extent will force a defrag. | |
923 | * | |
924 | * The end result of this is that tiny extents before a single big | |
925 | * extent will force at least part of that big extent to be defragged. | |
926 | */ | |
927 | if (ret) { | |
940100a4 CM |
928 | *defrag_end = extent_map_end(em); |
929 | } else { | |
930 | *last_len = 0; | |
931 | *skip = extent_map_end(em); | |
932 | *defrag_end = 0; | |
933 | } | |
934 | ||
935 | free_extent_map(em); | |
936 | return ret; | |
937 | } | |
938 | ||
4cb5300b CM |
939 | /* |
940 | * it doesn't do much good to defrag one or two pages | |
941 | * at a time. This pulls in a nice chunk of pages | |
942 | * to COW and defrag. | |
943 | * | |
944 | * It also makes sure the delalloc code has enough | |
945 | * dirty data to avoid making new small extents as part | |
946 | * of the defrag | |
947 | * | |
948 | * It's a good idea to start RA on this range | |
949 | * before calling this. | |
950 | */ | |
951 | static int cluster_pages_for_defrag(struct inode *inode, | |
952 | struct page **pages, | |
953 | unsigned long start_index, | |
954 | int num_pages) | |
f46b5a66 | 955 | { |
4cb5300b CM |
956 | unsigned long file_end; |
957 | u64 isize = i_size_read(inode); | |
958 | u64 page_start; | |
959 | u64 page_end; | |
1f12bd06 | 960 | u64 page_cnt; |
4cb5300b CM |
961 | int ret; |
962 | int i; | |
963 | int i_done; | |
3eaa2885 | 964 | struct btrfs_ordered_extent *ordered; |
4cb5300b | 965 | struct extent_state *cached_state = NULL; |
600a45e1 | 966 | struct extent_io_tree *tree; |
3b16a4e3 | 967 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
4cb5300b | 968 | |
4cb5300b | 969 | file_end = (isize - 1) >> PAGE_CACHE_SHIFT; |
1f12bd06 LB |
970 | if (!isize || start_index > file_end) |
971 | return 0; | |
972 | ||
973 | page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); | |
4cb5300b CM |
974 | |
975 | ret = btrfs_delalloc_reserve_space(inode, | |
1f12bd06 | 976 | page_cnt << PAGE_CACHE_SHIFT); |
4cb5300b CM |
977 | if (ret) |
978 | return ret; | |
4cb5300b | 979 | i_done = 0; |
600a45e1 | 980 | tree = &BTRFS_I(inode)->io_tree; |
4cb5300b CM |
981 | |
982 | /* step one, lock all the pages */ | |
1f12bd06 | 983 | for (i = 0; i < page_cnt; i++) { |
4cb5300b | 984 | struct page *page; |
600a45e1 | 985 | again: |
a94733d0 | 986 | page = find_or_create_page(inode->i_mapping, |
600a45e1 | 987 | start_index + i, mask); |
4cb5300b CM |
988 | if (!page) |
989 | break; | |
990 | ||
600a45e1 MX |
991 | page_start = page_offset(page); |
992 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
993 | while (1) { | |
d0082371 | 994 | lock_extent(tree, page_start, page_end); |
600a45e1 MX |
995 | ordered = btrfs_lookup_ordered_extent(inode, |
996 | page_start); | |
d0082371 | 997 | unlock_extent(tree, page_start, page_end); |
600a45e1 MX |
998 | if (!ordered) |
999 | break; | |
1000 | ||
1001 | unlock_page(page); | |
1002 | btrfs_start_ordered_extent(inode, ordered, 1); | |
1003 | btrfs_put_ordered_extent(ordered); | |
1004 | lock_page(page); | |
1f12bd06 LB |
1005 | /* |
1006 | * we unlocked the page above, so we need check if | |
1007 | * it was released or not. | |
1008 | */ | |
1009 | if (page->mapping != inode->i_mapping) { | |
1010 | unlock_page(page); | |
1011 | page_cache_release(page); | |
1012 | goto again; | |
1013 | } | |
600a45e1 MX |
1014 | } |
1015 | ||
4cb5300b CM |
1016 | if (!PageUptodate(page)) { |
1017 | btrfs_readpage(NULL, page); | |
1018 | lock_page(page); | |
1019 | if (!PageUptodate(page)) { | |
1020 | unlock_page(page); | |
1021 | page_cache_release(page); | |
1022 | ret = -EIO; | |
1023 | break; | |
1024 | } | |
1025 | } | |
600a45e1 | 1026 | |
600a45e1 MX |
1027 | if (page->mapping != inode->i_mapping) { |
1028 | unlock_page(page); | |
1029 | page_cache_release(page); | |
1030 | goto again; | |
1031 | } | |
1032 | ||
4cb5300b CM |
1033 | pages[i] = page; |
1034 | i_done++; | |
1035 | } | |
1036 | if (!i_done || ret) | |
1037 | goto out; | |
1038 | ||
1039 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
1040 | goto out; | |
1041 | ||
1042 | /* | |
1043 | * so now we have a nice long stream of locked | |
1044 | * and up to date pages, lets wait on them | |
1045 | */ | |
1046 | for (i = 0; i < i_done; i++) | |
1047 | wait_on_page_writeback(pages[i]); | |
1048 | ||
1049 | page_start = page_offset(pages[0]); | |
1050 | page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; | |
1051 | ||
1052 | lock_extent_bits(&BTRFS_I(inode)->io_tree, | |
d0082371 | 1053 | page_start, page_end - 1, 0, &cached_state); |
4cb5300b CM |
1054 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, |
1055 | page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | | |
9e8a4a8b LB |
1056 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, |
1057 | &cached_state, GFP_NOFS); | |
4cb5300b | 1058 | |
1f12bd06 | 1059 | if (i_done != page_cnt) { |
9e0baf60 JB |
1060 | spin_lock(&BTRFS_I(inode)->lock); |
1061 | BTRFS_I(inode)->outstanding_extents++; | |
1062 | spin_unlock(&BTRFS_I(inode)->lock); | |
4cb5300b | 1063 | btrfs_delalloc_release_space(inode, |
1f12bd06 | 1064 | (page_cnt - i_done) << PAGE_CACHE_SHIFT); |
4cb5300b CM |
1065 | } |
1066 | ||
1067 | ||
9e8a4a8b LB |
1068 | set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, |
1069 | &cached_state, GFP_NOFS); | |
4cb5300b CM |
1070 | |
1071 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, | |
1072 | page_start, page_end - 1, &cached_state, | |
1073 | GFP_NOFS); | |
1074 | ||
1075 | for (i = 0; i < i_done; i++) { | |
1076 | clear_page_dirty_for_io(pages[i]); | |
1077 | ClearPageChecked(pages[i]); | |
1078 | set_page_extent_mapped(pages[i]); | |
1079 | set_page_dirty(pages[i]); | |
1080 | unlock_page(pages[i]); | |
1081 | page_cache_release(pages[i]); | |
1082 | } | |
1083 | return i_done; | |
1084 | out: | |
1085 | for (i = 0; i < i_done; i++) { | |
1086 | unlock_page(pages[i]); | |
1087 | page_cache_release(pages[i]); | |
1088 | } | |
1f12bd06 | 1089 | btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); |
4cb5300b CM |
1090 | return ret; |
1091 | ||
1092 | } | |
1093 | ||
1094 | int btrfs_defrag_file(struct inode *inode, struct file *file, | |
1095 | struct btrfs_ioctl_defrag_range_args *range, | |
1096 | u64 newer_than, unsigned long max_to_defrag) | |
1097 | { | |
1098 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4cb5300b | 1099 | struct file_ra_state *ra = NULL; |
f46b5a66 | 1100 | unsigned long last_index; |
151a31b2 | 1101 | u64 isize = i_size_read(inode); |
940100a4 CM |
1102 | u64 last_len = 0; |
1103 | u64 skip = 0; | |
1104 | u64 defrag_end = 0; | |
4cb5300b | 1105 | u64 newer_off = range->start; |
f46b5a66 | 1106 | unsigned long i; |
008873ea | 1107 | unsigned long ra_index = 0; |
f46b5a66 | 1108 | int ret; |
4cb5300b | 1109 | int defrag_count = 0; |
1a419d85 | 1110 | int compress_type = BTRFS_COMPRESS_ZLIB; |
4cb5300b | 1111 | int extent_thresh = range->extent_thresh; |
008873ea LZ |
1112 | int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; |
1113 | int cluster = max_cluster; | |
4cb5300b CM |
1114 | u64 new_align = ~((u64)128 * 1024 - 1); |
1115 | struct page **pages = NULL; | |
1116 | ||
1117 | if (extent_thresh == 0) | |
1118 | extent_thresh = 256 * 1024; | |
1a419d85 LZ |
1119 | |
1120 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { | |
1121 | if (range->compress_type > BTRFS_COMPRESS_TYPES) | |
1122 | return -EINVAL; | |
1123 | if (range->compress_type) | |
1124 | compress_type = range->compress_type; | |
1125 | } | |
f46b5a66 | 1126 | |
151a31b2 | 1127 | if (isize == 0) |
940100a4 CM |
1128 | return 0; |
1129 | ||
4cb5300b CM |
1130 | /* |
1131 | * if we were not given a file, allocate a readahead | |
1132 | * context | |
1133 | */ | |
1134 | if (!file) { | |
1135 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
1136 | if (!ra) | |
1137 | return -ENOMEM; | |
1138 | file_ra_state_init(ra, inode->i_mapping); | |
1139 | } else { | |
1140 | ra = &file->f_ra; | |
1141 | } | |
1142 | ||
008873ea | 1143 | pages = kmalloc(sizeof(struct page *) * max_cluster, |
4cb5300b CM |
1144 | GFP_NOFS); |
1145 | if (!pages) { | |
1146 | ret = -ENOMEM; | |
1147 | goto out_ra; | |
1148 | } | |
1149 | ||
1150 | /* find the last page to defrag */ | |
1e701a32 | 1151 | if (range->start + range->len > range->start) { |
151a31b2 | 1152 | last_index = min_t(u64, isize - 1, |
1e701a32 CM |
1153 | range->start + range->len - 1) >> PAGE_CACHE_SHIFT; |
1154 | } else { | |
151a31b2 | 1155 | last_index = (isize - 1) >> PAGE_CACHE_SHIFT; |
1e701a32 CM |
1156 | } |
1157 | ||
4cb5300b CM |
1158 | if (newer_than) { |
1159 | ret = find_new_extents(root, inode, newer_than, | |
1160 | &newer_off, 64 * 1024); | |
1161 | if (!ret) { | |
1162 | range->start = newer_off; | |
1163 | /* | |
1164 | * we always align our defrag to help keep | |
1165 | * the extents in the file evenly spaced | |
1166 | */ | |
1167 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; | |
4cb5300b CM |
1168 | } else |
1169 | goto out_ra; | |
1170 | } else { | |
1171 | i = range->start >> PAGE_CACHE_SHIFT; | |
1172 | } | |
1173 | if (!max_to_defrag) | |
7ec31b54 | 1174 | max_to_defrag = last_index + 1; |
4cb5300b | 1175 | |
2a0f7f57 LZ |
1176 | /* |
1177 | * make writeback starts from i, so the defrag range can be | |
1178 | * written sequentially. | |
1179 | */ | |
1180 | if (i < inode->i_mapping->writeback_index) | |
1181 | inode->i_mapping->writeback_index = i; | |
1182 | ||
f7f43cc8 CM |
1183 | while (i <= last_index && defrag_count < max_to_defrag && |
1184 | (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> | |
1185 | PAGE_CACHE_SHIFT)) { | |
4cb5300b CM |
1186 | /* |
1187 | * make sure we stop running if someone unmounts | |
1188 | * the FS | |
1189 | */ | |
1190 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
1191 | break; | |
1192 | ||
66c26892 | 1193 | if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, |
6c282eb4 | 1194 | extent_thresh, &last_len, &skip, |
a43a2111 AM |
1195 | &defrag_end, range->flags & |
1196 | BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
940100a4 CM |
1197 | unsigned long next; |
1198 | /* | |
1199 | * the should_defrag function tells us how much to skip | |
1200 | * bump our counter by the suggested amount | |
1201 | */ | |
1202 | next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
1203 | i = max(i + 1, next); | |
1204 | continue; | |
1205 | } | |
008873ea LZ |
1206 | |
1207 | if (!newer_than) { | |
1208 | cluster = (PAGE_CACHE_ALIGN(defrag_end) >> | |
1209 | PAGE_CACHE_SHIFT) - i; | |
1210 | cluster = min(cluster, max_cluster); | |
1211 | } else { | |
1212 | cluster = max_cluster; | |
1213 | } | |
1214 | ||
1e701a32 | 1215 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) |
1a419d85 | 1216 | BTRFS_I(inode)->force_compress = compress_type; |
940100a4 | 1217 | |
008873ea LZ |
1218 | if (i + cluster > ra_index) { |
1219 | ra_index = max(i, ra_index); | |
1220 | btrfs_force_ra(inode->i_mapping, ra, file, ra_index, | |
1221 | cluster); | |
1222 | ra_index += max_cluster; | |
1223 | } | |
940100a4 | 1224 | |
ecb8bea8 | 1225 | mutex_lock(&inode->i_mutex); |
008873ea | 1226 | ret = cluster_pages_for_defrag(inode, pages, i, cluster); |
ecb8bea8 LB |
1227 | if (ret < 0) { |
1228 | mutex_unlock(&inode->i_mutex); | |
4cb5300b | 1229 | goto out_ra; |
ecb8bea8 | 1230 | } |
4cb5300b CM |
1231 | |
1232 | defrag_count += ret; | |
1233 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, ret); | |
ecb8bea8 | 1234 | mutex_unlock(&inode->i_mutex); |
4cb5300b CM |
1235 | |
1236 | if (newer_than) { | |
1237 | if (newer_off == (u64)-1) | |
1238 | break; | |
1239 | ||
e1f041e1 LB |
1240 | if (ret > 0) |
1241 | i += ret; | |
1242 | ||
4cb5300b CM |
1243 | newer_off = max(newer_off + 1, |
1244 | (u64)i << PAGE_CACHE_SHIFT); | |
1245 | ||
1246 | ret = find_new_extents(root, inode, | |
1247 | newer_than, &newer_off, | |
1248 | 64 * 1024); | |
1249 | if (!ret) { | |
1250 | range->start = newer_off; | |
1251 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; | |
4cb5300b CM |
1252 | } else { |
1253 | break; | |
f46b5a66 | 1254 | } |
4cb5300b | 1255 | } else { |
008873ea | 1256 | if (ret > 0) { |
cbcc8326 | 1257 | i += ret; |
008873ea LZ |
1258 | last_len += ret << PAGE_CACHE_SHIFT; |
1259 | } else { | |
cbcc8326 | 1260 | i++; |
008873ea LZ |
1261 | last_len = 0; |
1262 | } | |
f46b5a66 | 1263 | } |
f46b5a66 CH |
1264 | } |
1265 | ||
1e701a32 CM |
1266 | if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) |
1267 | filemap_flush(inode->i_mapping); | |
1268 | ||
1269 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
1270 | /* the filemap_flush will queue IO into the worker threads, but | |
1271 | * we have to make sure the IO is actually started and that | |
1272 | * ordered extents get created before we return | |
1273 | */ | |
1274 | atomic_inc(&root->fs_info->async_submit_draining); | |
1275 | while (atomic_read(&root->fs_info->nr_async_submits) || | |
1276 | atomic_read(&root->fs_info->async_delalloc_pages)) { | |
1277 | wait_event(root->fs_info->async_submit_wait, | |
1278 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && | |
1279 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); | |
1280 | } | |
1281 | atomic_dec(&root->fs_info->async_submit_draining); | |
1282 | ||
1283 | mutex_lock(&inode->i_mutex); | |
261507a0 | 1284 | BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; |
1e701a32 CM |
1285 | mutex_unlock(&inode->i_mutex); |
1286 | } | |
1287 | ||
1a419d85 | 1288 | if (range->compress_type == BTRFS_COMPRESS_LZO) { |
2b0ce2c2 | 1289 | btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); |
1a419d85 LZ |
1290 | } |
1291 | ||
60ccf82f | 1292 | ret = defrag_count; |
940100a4 | 1293 | |
4cb5300b CM |
1294 | out_ra: |
1295 | if (!file) | |
1296 | kfree(ra); | |
1297 | kfree(pages); | |
940100a4 | 1298 | return ret; |
f46b5a66 CH |
1299 | } |
1300 | ||
76dda93c YZ |
1301 | static noinline int btrfs_ioctl_resize(struct btrfs_root *root, |
1302 | void __user *arg) | |
f46b5a66 CH |
1303 | { |
1304 | u64 new_size; | |
1305 | u64 old_size; | |
1306 | u64 devid = 1; | |
1307 | struct btrfs_ioctl_vol_args *vol_args; | |
1308 | struct btrfs_trans_handle *trans; | |
1309 | struct btrfs_device *device = NULL; | |
1310 | char *sizestr; | |
1311 | char *devstr = NULL; | |
1312 | int ret = 0; | |
f46b5a66 CH |
1313 | int mod = 0; |
1314 | ||
c146afad YZ |
1315 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
1316 | return -EROFS; | |
1317 | ||
e441d54d CM |
1318 | if (!capable(CAP_SYS_ADMIN)) |
1319 | return -EPERM; | |
1320 | ||
5ac00add SB |
1321 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
1322 | 1)) { | |
1323 | pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); | |
1324 | return -EINPROGRESS; | |
c9e9f97b ID |
1325 | } |
1326 | ||
5ac00add | 1327 | mutex_lock(&root->fs_info->volume_mutex); |
dae7b665 | 1328 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
1329 | if (IS_ERR(vol_args)) { |
1330 | ret = PTR_ERR(vol_args); | |
1331 | goto out; | |
1332 | } | |
5516e595 MF |
1333 | |
1334 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 1335 | |
f46b5a66 CH |
1336 | sizestr = vol_args->name; |
1337 | devstr = strchr(sizestr, ':'); | |
1338 | if (devstr) { | |
1339 | char *end; | |
1340 | sizestr = devstr + 1; | |
1341 | *devstr = '\0'; | |
1342 | devstr = vol_args->name; | |
1343 | devid = simple_strtoull(devstr, &end, 10); | |
5bb14682 | 1344 | printk(KERN_INFO "btrfs: resizing devid %llu\n", |
21380931 | 1345 | (unsigned long long)devid); |
f46b5a66 | 1346 | } |
aa1b8cd4 | 1347 | device = btrfs_find_device(root->fs_info, devid, NULL, NULL); |
f46b5a66 | 1348 | if (!device) { |
5bb14682 | 1349 | printk(KERN_INFO "btrfs: resizer unable to find device %llu\n", |
21380931 | 1350 | (unsigned long long)devid); |
f46b5a66 | 1351 | ret = -EINVAL; |
c9e9f97b | 1352 | goto out_free; |
f46b5a66 | 1353 | } |
4e42ae1b LB |
1354 | if (device->fs_devices && device->fs_devices->seeding) { |
1355 | printk(KERN_INFO "btrfs: resizer unable to apply on " | |
a8c4a33b CM |
1356 | "seeding device %llu\n", |
1357 | (unsigned long long)devid); | |
4e42ae1b LB |
1358 | ret = -EINVAL; |
1359 | goto out_free; | |
1360 | } | |
1361 | ||
f46b5a66 CH |
1362 | if (!strcmp(sizestr, "max")) |
1363 | new_size = device->bdev->bd_inode->i_size; | |
1364 | else { | |
1365 | if (sizestr[0] == '-') { | |
1366 | mod = -1; | |
1367 | sizestr++; | |
1368 | } else if (sizestr[0] == '+') { | |
1369 | mod = 1; | |
1370 | sizestr++; | |
1371 | } | |
91748467 | 1372 | new_size = memparse(sizestr, NULL); |
f46b5a66 CH |
1373 | if (new_size == 0) { |
1374 | ret = -EINVAL; | |
c9e9f97b | 1375 | goto out_free; |
f46b5a66 CH |
1376 | } |
1377 | } | |
1378 | ||
63a212ab SB |
1379 | if (device->is_tgtdev_for_dev_replace) { |
1380 | ret = -EINVAL; | |
1381 | goto out_free; | |
1382 | } | |
1383 | ||
f46b5a66 CH |
1384 | old_size = device->total_bytes; |
1385 | ||
1386 | if (mod < 0) { | |
1387 | if (new_size > old_size) { | |
1388 | ret = -EINVAL; | |
c9e9f97b | 1389 | goto out_free; |
f46b5a66 CH |
1390 | } |
1391 | new_size = old_size - new_size; | |
1392 | } else if (mod > 0) { | |
1393 | new_size = old_size + new_size; | |
1394 | } | |
1395 | ||
1396 | if (new_size < 256 * 1024 * 1024) { | |
1397 | ret = -EINVAL; | |
c9e9f97b | 1398 | goto out_free; |
f46b5a66 CH |
1399 | } |
1400 | if (new_size > device->bdev->bd_inode->i_size) { | |
1401 | ret = -EFBIG; | |
c9e9f97b | 1402 | goto out_free; |
f46b5a66 CH |
1403 | } |
1404 | ||
1405 | do_div(new_size, root->sectorsize); | |
1406 | new_size *= root->sectorsize; | |
1407 | ||
606686ee JB |
1408 | printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n", |
1409 | rcu_str_deref(device->name), | |
1410 | (unsigned long long)new_size); | |
f46b5a66 CH |
1411 | |
1412 | if (new_size > old_size) { | |
a22285a6 | 1413 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1414 | if (IS_ERR(trans)) { |
1415 | ret = PTR_ERR(trans); | |
c9e9f97b | 1416 | goto out_free; |
98d5dc13 | 1417 | } |
f46b5a66 CH |
1418 | ret = btrfs_grow_device(trans, device, new_size); |
1419 | btrfs_commit_transaction(trans, root); | |
ece7d20e | 1420 | } else if (new_size < old_size) { |
f46b5a66 | 1421 | ret = btrfs_shrink_device(device, new_size); |
0253f40e | 1422 | } /* equal, nothing need to do */ |
f46b5a66 | 1423 | |
c9e9f97b | 1424 | out_free: |
f46b5a66 | 1425 | kfree(vol_args); |
c9e9f97b ID |
1426 | out: |
1427 | mutex_unlock(&root->fs_info->volume_mutex); | |
5ac00add | 1428 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
f46b5a66 CH |
1429 | return ret; |
1430 | } | |
1431 | ||
72fd032e | 1432 | static noinline int btrfs_ioctl_snap_create_transid(struct file *file, |
6f72c7e2 AJ |
1433 | char *name, unsigned long fd, int subvol, |
1434 | u64 *transid, bool readonly, | |
1435 | struct btrfs_qgroup_inherit **inherit) | |
f46b5a66 | 1436 | { |
f46b5a66 | 1437 | int namelen; |
3de4586c | 1438 | int ret = 0; |
f46b5a66 | 1439 | |
a874a63e LB |
1440 | ret = mnt_want_write_file(file); |
1441 | if (ret) | |
1442 | goto out; | |
1443 | ||
72fd032e SW |
1444 | namelen = strlen(name); |
1445 | if (strchr(name, '/')) { | |
f46b5a66 | 1446 | ret = -EINVAL; |
a874a63e | 1447 | goto out_drop_write; |
f46b5a66 CH |
1448 | } |
1449 | ||
16780cab CM |
1450 | if (name[0] == '.' && |
1451 | (namelen == 1 || (name[1] == '.' && namelen == 2))) { | |
1452 | ret = -EEXIST; | |
a874a63e | 1453 | goto out_drop_write; |
16780cab CM |
1454 | } |
1455 | ||
3de4586c | 1456 | if (subvol) { |
72fd032e | 1457 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
6f72c7e2 | 1458 | NULL, transid, readonly, inherit); |
cb8e7090 | 1459 | } else { |
2903ff01 | 1460 | struct fd src = fdget(fd); |
3de4586c | 1461 | struct inode *src_inode; |
2903ff01 | 1462 | if (!src.file) { |
3de4586c | 1463 | ret = -EINVAL; |
a874a63e | 1464 | goto out_drop_write; |
3de4586c CM |
1465 | } |
1466 | ||
2903ff01 | 1467 | src_inode = src.file->f_path.dentry->d_inode; |
3de4586c | 1468 | if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { |
d397712b CM |
1469 | printk(KERN_INFO "btrfs: Snapshot src from " |
1470 | "another FS\n"); | |
3de4586c | 1471 | ret = -EINVAL; |
ecd18815 AV |
1472 | } else { |
1473 | ret = btrfs_mksubvol(&file->f_path, name, namelen, | |
1474 | BTRFS_I(src_inode)->root, | |
1475 | transid, readonly, inherit); | |
3de4586c | 1476 | } |
2903ff01 | 1477 | fdput(src); |
cb8e7090 | 1478 | } |
a874a63e LB |
1479 | out_drop_write: |
1480 | mnt_drop_write_file(file); | |
f46b5a66 | 1481 | out: |
72fd032e SW |
1482 | return ret; |
1483 | } | |
1484 | ||
1485 | static noinline int btrfs_ioctl_snap_create(struct file *file, | |
fa0d2b9b | 1486 | void __user *arg, int subvol) |
72fd032e | 1487 | { |
fa0d2b9b | 1488 | struct btrfs_ioctl_vol_args *vol_args; |
72fd032e SW |
1489 | int ret; |
1490 | ||
fa0d2b9b LZ |
1491 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1492 | if (IS_ERR(vol_args)) | |
1493 | return PTR_ERR(vol_args); | |
1494 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
72fd032e | 1495 | |
fa0d2b9b | 1496 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, |
b83cc969 | 1497 | vol_args->fd, subvol, |
6f72c7e2 | 1498 | NULL, false, NULL); |
fdfb1e4f | 1499 | |
fa0d2b9b LZ |
1500 | kfree(vol_args); |
1501 | return ret; | |
1502 | } | |
fdfb1e4f | 1503 | |
fa0d2b9b LZ |
1504 | static noinline int btrfs_ioctl_snap_create_v2(struct file *file, |
1505 | void __user *arg, int subvol) | |
1506 | { | |
1507 | struct btrfs_ioctl_vol_args_v2 *vol_args; | |
1508 | int ret; | |
1509 | u64 transid = 0; | |
1510 | u64 *ptr = NULL; | |
b83cc969 | 1511 | bool readonly = false; |
6f72c7e2 | 1512 | struct btrfs_qgroup_inherit *inherit = NULL; |
75eaa0e2 | 1513 | |
fa0d2b9b LZ |
1514 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1515 | if (IS_ERR(vol_args)) | |
1516 | return PTR_ERR(vol_args); | |
1517 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; | |
75eaa0e2 | 1518 | |
b83cc969 | 1519 | if (vol_args->flags & |
6f72c7e2 AJ |
1520 | ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | |
1521 | BTRFS_SUBVOL_QGROUP_INHERIT)) { | |
b83cc969 | 1522 | ret = -EOPNOTSUPP; |
fa0d2b9b | 1523 | goto out; |
72fd032e | 1524 | } |
fa0d2b9b LZ |
1525 | |
1526 | if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) | |
1527 | ptr = &transid; | |
b83cc969 LZ |
1528 | if (vol_args->flags & BTRFS_SUBVOL_RDONLY) |
1529 | readonly = true; | |
6f72c7e2 AJ |
1530 | if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { |
1531 | if (vol_args->size > PAGE_CACHE_SIZE) { | |
1532 | ret = -EINVAL; | |
1533 | goto out; | |
1534 | } | |
1535 | inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); | |
1536 | if (IS_ERR(inherit)) { | |
1537 | ret = PTR_ERR(inherit); | |
1538 | goto out; | |
1539 | } | |
1540 | } | |
fa0d2b9b LZ |
1541 | |
1542 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, | |
6f72c7e2 AJ |
1543 | vol_args->fd, subvol, ptr, |
1544 | readonly, &inherit); | |
fa0d2b9b LZ |
1545 | |
1546 | if (ret == 0 && ptr && | |
1547 | copy_to_user(arg + | |
1548 | offsetof(struct btrfs_ioctl_vol_args_v2, | |
1549 | transid), ptr, sizeof(*ptr))) | |
1550 | ret = -EFAULT; | |
fdfb1e4f | 1551 | out: |
f46b5a66 | 1552 | kfree(vol_args); |
6f72c7e2 | 1553 | kfree(inherit); |
f46b5a66 CH |
1554 | return ret; |
1555 | } | |
1556 | ||
0caa102d LZ |
1557 | static noinline int btrfs_ioctl_subvol_getflags(struct file *file, |
1558 | void __user *arg) | |
1559 | { | |
1560 | struct inode *inode = fdentry(file)->d_inode; | |
1561 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1562 | int ret = 0; | |
1563 | u64 flags = 0; | |
1564 | ||
33345d01 | 1565 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) |
0caa102d LZ |
1566 | return -EINVAL; |
1567 | ||
1568 | down_read(&root->fs_info->subvol_sem); | |
1569 | if (btrfs_root_readonly(root)) | |
1570 | flags |= BTRFS_SUBVOL_RDONLY; | |
1571 | up_read(&root->fs_info->subvol_sem); | |
1572 | ||
1573 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
1574 | ret = -EFAULT; | |
1575 | ||
1576 | return ret; | |
1577 | } | |
1578 | ||
1579 | static noinline int btrfs_ioctl_subvol_setflags(struct file *file, | |
1580 | void __user *arg) | |
1581 | { | |
1582 | struct inode *inode = fdentry(file)->d_inode; | |
1583 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1584 | struct btrfs_trans_handle *trans; | |
1585 | u64 root_flags; | |
1586 | u64 flags; | |
1587 | int ret = 0; | |
1588 | ||
b9ca0664 LB |
1589 | ret = mnt_want_write_file(file); |
1590 | if (ret) | |
1591 | goto out; | |
0caa102d | 1592 | |
b9ca0664 LB |
1593 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
1594 | ret = -EINVAL; | |
1595 | goto out_drop_write; | |
1596 | } | |
0caa102d | 1597 | |
b9ca0664 LB |
1598 | if (copy_from_user(&flags, arg, sizeof(flags))) { |
1599 | ret = -EFAULT; | |
1600 | goto out_drop_write; | |
1601 | } | |
0caa102d | 1602 | |
b9ca0664 LB |
1603 | if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { |
1604 | ret = -EINVAL; | |
1605 | goto out_drop_write; | |
1606 | } | |
0caa102d | 1607 | |
b9ca0664 LB |
1608 | if (flags & ~BTRFS_SUBVOL_RDONLY) { |
1609 | ret = -EOPNOTSUPP; | |
1610 | goto out_drop_write; | |
1611 | } | |
0caa102d | 1612 | |
b9ca0664 LB |
1613 | if (!inode_owner_or_capable(inode)) { |
1614 | ret = -EACCES; | |
1615 | goto out_drop_write; | |
1616 | } | |
b4dc2b8c | 1617 | |
0caa102d LZ |
1618 | down_write(&root->fs_info->subvol_sem); |
1619 | ||
1620 | /* nothing to do */ | |
1621 | if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) | |
b9ca0664 | 1622 | goto out_drop_sem; |
0caa102d LZ |
1623 | |
1624 | root_flags = btrfs_root_flags(&root->root_item); | |
1625 | if (flags & BTRFS_SUBVOL_RDONLY) | |
1626 | btrfs_set_root_flags(&root->root_item, | |
1627 | root_flags | BTRFS_ROOT_SUBVOL_RDONLY); | |
1628 | else | |
1629 | btrfs_set_root_flags(&root->root_item, | |
1630 | root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); | |
1631 | ||
1632 | trans = btrfs_start_transaction(root, 1); | |
1633 | if (IS_ERR(trans)) { | |
1634 | ret = PTR_ERR(trans); | |
1635 | goto out_reset; | |
1636 | } | |
1637 | ||
b4dc2b8c | 1638 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
0caa102d LZ |
1639 | &root->root_key, &root->root_item); |
1640 | ||
1641 | btrfs_commit_transaction(trans, root); | |
1642 | out_reset: | |
1643 | if (ret) | |
1644 | btrfs_set_root_flags(&root->root_item, root_flags); | |
b9ca0664 | 1645 | out_drop_sem: |
0caa102d | 1646 | up_write(&root->fs_info->subvol_sem); |
b9ca0664 LB |
1647 | out_drop_write: |
1648 | mnt_drop_write_file(file); | |
1649 | out: | |
0caa102d LZ |
1650 | return ret; |
1651 | } | |
1652 | ||
76dda93c YZ |
1653 | /* |
1654 | * helper to check if the subvolume references other subvolumes | |
1655 | */ | |
1656 | static noinline int may_destroy_subvol(struct btrfs_root *root) | |
1657 | { | |
1658 | struct btrfs_path *path; | |
1659 | struct btrfs_key key; | |
1660 | int ret; | |
1661 | ||
1662 | path = btrfs_alloc_path(); | |
1663 | if (!path) | |
1664 | return -ENOMEM; | |
1665 | ||
1666 | key.objectid = root->root_key.objectid; | |
1667 | key.type = BTRFS_ROOT_REF_KEY; | |
1668 | key.offset = (u64)-1; | |
1669 | ||
1670 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, | |
1671 | &key, path, 0, 0); | |
1672 | if (ret < 0) | |
1673 | goto out; | |
1674 | BUG_ON(ret == 0); | |
1675 | ||
1676 | ret = 0; | |
1677 | if (path->slots[0] > 0) { | |
1678 | path->slots[0]--; | |
1679 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1680 | if (key.objectid == root->root_key.objectid && | |
1681 | key.type == BTRFS_ROOT_REF_KEY) | |
1682 | ret = -ENOTEMPTY; | |
1683 | } | |
1684 | out: | |
1685 | btrfs_free_path(path); | |
1686 | return ret; | |
1687 | } | |
1688 | ||
ac8e9819 CM |
1689 | static noinline int key_in_sk(struct btrfs_key *key, |
1690 | struct btrfs_ioctl_search_key *sk) | |
1691 | { | |
abc6e134 CM |
1692 | struct btrfs_key test; |
1693 | int ret; | |
1694 | ||
1695 | test.objectid = sk->min_objectid; | |
1696 | test.type = sk->min_type; | |
1697 | test.offset = sk->min_offset; | |
1698 | ||
1699 | ret = btrfs_comp_cpu_keys(key, &test); | |
1700 | if (ret < 0) | |
ac8e9819 | 1701 | return 0; |
abc6e134 CM |
1702 | |
1703 | test.objectid = sk->max_objectid; | |
1704 | test.type = sk->max_type; | |
1705 | test.offset = sk->max_offset; | |
1706 | ||
1707 | ret = btrfs_comp_cpu_keys(key, &test); | |
1708 | if (ret > 0) | |
ac8e9819 CM |
1709 | return 0; |
1710 | return 1; | |
1711 | } | |
1712 | ||
1713 | static noinline int copy_to_sk(struct btrfs_root *root, | |
1714 | struct btrfs_path *path, | |
1715 | struct btrfs_key *key, | |
1716 | struct btrfs_ioctl_search_key *sk, | |
1717 | char *buf, | |
1718 | unsigned long *sk_offset, | |
1719 | int *num_found) | |
1720 | { | |
1721 | u64 found_transid; | |
1722 | struct extent_buffer *leaf; | |
1723 | struct btrfs_ioctl_search_header sh; | |
1724 | unsigned long item_off; | |
1725 | unsigned long item_len; | |
1726 | int nritems; | |
1727 | int i; | |
1728 | int slot; | |
ac8e9819 CM |
1729 | int ret = 0; |
1730 | ||
1731 | leaf = path->nodes[0]; | |
1732 | slot = path->slots[0]; | |
1733 | nritems = btrfs_header_nritems(leaf); | |
1734 | ||
1735 | if (btrfs_header_generation(leaf) > sk->max_transid) { | |
1736 | i = nritems; | |
1737 | goto advance_key; | |
1738 | } | |
1739 | found_transid = btrfs_header_generation(leaf); | |
1740 | ||
1741 | for (i = slot; i < nritems; i++) { | |
1742 | item_off = btrfs_item_ptr_offset(leaf, i); | |
1743 | item_len = btrfs_item_size_nr(leaf, i); | |
1744 | ||
1745 | if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) | |
1746 | item_len = 0; | |
1747 | ||
1748 | if (sizeof(sh) + item_len + *sk_offset > | |
1749 | BTRFS_SEARCH_ARGS_BUFSIZE) { | |
1750 | ret = 1; | |
1751 | goto overflow; | |
1752 | } | |
1753 | ||
1754 | btrfs_item_key_to_cpu(leaf, key, i); | |
1755 | if (!key_in_sk(key, sk)) | |
1756 | continue; | |
1757 | ||
1758 | sh.objectid = key->objectid; | |
1759 | sh.offset = key->offset; | |
1760 | sh.type = key->type; | |
1761 | sh.len = item_len; | |
1762 | sh.transid = found_transid; | |
1763 | ||
1764 | /* copy search result header */ | |
1765 | memcpy(buf + *sk_offset, &sh, sizeof(sh)); | |
1766 | *sk_offset += sizeof(sh); | |
1767 | ||
1768 | if (item_len) { | |
1769 | char *p = buf + *sk_offset; | |
1770 | /* copy the item */ | |
1771 | read_extent_buffer(leaf, p, | |
1772 | item_off, item_len); | |
1773 | *sk_offset += item_len; | |
ac8e9819 | 1774 | } |
e2156867 | 1775 | (*num_found)++; |
ac8e9819 CM |
1776 | |
1777 | if (*num_found >= sk->nr_items) | |
1778 | break; | |
1779 | } | |
1780 | advance_key: | |
abc6e134 CM |
1781 | ret = 0; |
1782 | if (key->offset < (u64)-1 && key->offset < sk->max_offset) | |
ac8e9819 | 1783 | key->offset++; |
abc6e134 CM |
1784 | else if (key->type < (u8)-1 && key->type < sk->max_type) { |
1785 | key->offset = 0; | |
ac8e9819 | 1786 | key->type++; |
abc6e134 CM |
1787 | } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { |
1788 | key->offset = 0; | |
1789 | key->type = 0; | |
ac8e9819 | 1790 | key->objectid++; |
abc6e134 CM |
1791 | } else |
1792 | ret = 1; | |
ac8e9819 | 1793 | overflow: |
ac8e9819 CM |
1794 | return ret; |
1795 | } | |
1796 | ||
1797 | static noinline int search_ioctl(struct inode *inode, | |
1798 | struct btrfs_ioctl_search_args *args) | |
1799 | { | |
1800 | struct btrfs_root *root; | |
1801 | struct btrfs_key key; | |
1802 | struct btrfs_key max_key; | |
1803 | struct btrfs_path *path; | |
1804 | struct btrfs_ioctl_search_key *sk = &args->key; | |
1805 | struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; | |
1806 | int ret; | |
1807 | int num_found = 0; | |
1808 | unsigned long sk_offset = 0; | |
1809 | ||
1810 | path = btrfs_alloc_path(); | |
1811 | if (!path) | |
1812 | return -ENOMEM; | |
1813 | ||
1814 | if (sk->tree_id == 0) { | |
1815 | /* search the root of the inode that was passed */ | |
1816 | root = BTRFS_I(inode)->root; | |
1817 | } else { | |
1818 | key.objectid = sk->tree_id; | |
1819 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1820 | key.offset = (u64)-1; | |
1821 | root = btrfs_read_fs_root_no_name(info, &key); | |
1822 | if (IS_ERR(root)) { | |
1823 | printk(KERN_ERR "could not find root %llu\n", | |
1824 | sk->tree_id); | |
1825 | btrfs_free_path(path); | |
1826 | return -ENOENT; | |
1827 | } | |
1828 | } | |
1829 | ||
1830 | key.objectid = sk->min_objectid; | |
1831 | key.type = sk->min_type; | |
1832 | key.offset = sk->min_offset; | |
1833 | ||
1834 | max_key.objectid = sk->max_objectid; | |
1835 | max_key.type = sk->max_type; | |
1836 | max_key.offset = sk->max_offset; | |
1837 | ||
1838 | path->keep_locks = 1; | |
1839 | ||
1840 | while(1) { | |
1841 | ret = btrfs_search_forward(root, &key, &max_key, path, 0, | |
1842 | sk->min_transid); | |
1843 | if (ret != 0) { | |
1844 | if (ret > 0) | |
1845 | ret = 0; | |
1846 | goto err; | |
1847 | } | |
1848 | ret = copy_to_sk(root, path, &key, sk, args->buf, | |
1849 | &sk_offset, &num_found); | |
b3b4aa74 | 1850 | btrfs_release_path(path); |
ac8e9819 CM |
1851 | if (ret || num_found >= sk->nr_items) |
1852 | break; | |
1853 | ||
1854 | } | |
1855 | ret = 0; | |
1856 | err: | |
1857 | sk->nr_items = num_found; | |
1858 | btrfs_free_path(path); | |
1859 | return ret; | |
1860 | } | |
1861 | ||
1862 | static noinline int btrfs_ioctl_tree_search(struct file *file, | |
1863 | void __user *argp) | |
1864 | { | |
1865 | struct btrfs_ioctl_search_args *args; | |
1866 | struct inode *inode; | |
1867 | int ret; | |
1868 | ||
1869 | if (!capable(CAP_SYS_ADMIN)) | |
1870 | return -EPERM; | |
1871 | ||
2354d08f JL |
1872 | args = memdup_user(argp, sizeof(*args)); |
1873 | if (IS_ERR(args)) | |
1874 | return PTR_ERR(args); | |
ac8e9819 | 1875 | |
ac8e9819 CM |
1876 | inode = fdentry(file)->d_inode; |
1877 | ret = search_ioctl(inode, args); | |
1878 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
1879 | ret = -EFAULT; | |
1880 | kfree(args); | |
1881 | return ret; | |
1882 | } | |
1883 | ||
98d377a0 | 1884 | /* |
ac8e9819 CM |
1885 | * Search INODE_REFs to identify path name of 'dirid' directory |
1886 | * in a 'tree_id' tree. and sets path name to 'name'. | |
1887 | */ | |
98d377a0 TH |
1888 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
1889 | u64 tree_id, u64 dirid, char *name) | |
1890 | { | |
1891 | struct btrfs_root *root; | |
1892 | struct btrfs_key key; | |
ac8e9819 | 1893 | char *ptr; |
98d377a0 TH |
1894 | int ret = -1; |
1895 | int slot; | |
1896 | int len; | |
1897 | int total_len = 0; | |
1898 | struct btrfs_inode_ref *iref; | |
1899 | struct extent_buffer *l; | |
1900 | struct btrfs_path *path; | |
1901 | ||
1902 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { | |
1903 | name[0]='\0'; | |
1904 | return 0; | |
1905 | } | |
1906 | ||
1907 | path = btrfs_alloc_path(); | |
1908 | if (!path) | |
1909 | return -ENOMEM; | |
1910 | ||
ac8e9819 | 1911 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; |
98d377a0 TH |
1912 | |
1913 | key.objectid = tree_id; | |
1914 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1915 | key.offset = (u64)-1; | |
1916 | root = btrfs_read_fs_root_no_name(info, &key); | |
1917 | if (IS_ERR(root)) { | |
1918 | printk(KERN_ERR "could not find root %llu\n", tree_id); | |
8ad6fcab CM |
1919 | ret = -ENOENT; |
1920 | goto out; | |
98d377a0 TH |
1921 | } |
1922 | ||
1923 | key.objectid = dirid; | |
1924 | key.type = BTRFS_INODE_REF_KEY; | |
8ad6fcab | 1925 | key.offset = (u64)-1; |
98d377a0 TH |
1926 | |
1927 | while(1) { | |
1928 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1929 | if (ret < 0) | |
1930 | goto out; | |
1931 | ||
1932 | l = path->nodes[0]; | |
1933 | slot = path->slots[0]; | |
8ad6fcab CM |
1934 | if (ret > 0 && slot > 0) |
1935 | slot--; | |
98d377a0 TH |
1936 | btrfs_item_key_to_cpu(l, &key, slot); |
1937 | ||
1938 | if (ret > 0 && (key.objectid != dirid || | |
ac8e9819 CM |
1939 | key.type != BTRFS_INODE_REF_KEY)) { |
1940 | ret = -ENOENT; | |
98d377a0 | 1941 | goto out; |
ac8e9819 | 1942 | } |
98d377a0 TH |
1943 | |
1944 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); | |
1945 | len = btrfs_inode_ref_name_len(l, iref); | |
1946 | ptr -= len + 1; | |
1947 | total_len += len + 1; | |
ac8e9819 | 1948 | if (ptr < name) |
98d377a0 TH |
1949 | goto out; |
1950 | ||
1951 | *(ptr + len) = '/'; | |
1952 | read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); | |
1953 | ||
1954 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) | |
1955 | break; | |
1956 | ||
b3b4aa74 | 1957 | btrfs_release_path(path); |
98d377a0 | 1958 | key.objectid = key.offset; |
8ad6fcab | 1959 | key.offset = (u64)-1; |
98d377a0 | 1960 | dirid = key.objectid; |
98d377a0 | 1961 | } |
ac8e9819 | 1962 | if (ptr < name) |
98d377a0 | 1963 | goto out; |
77906a50 | 1964 | memmove(name, ptr, total_len); |
98d377a0 TH |
1965 | name[total_len]='\0'; |
1966 | ret = 0; | |
1967 | out: | |
1968 | btrfs_free_path(path); | |
ac8e9819 CM |
1969 | return ret; |
1970 | } | |
1971 | ||
1972 | static noinline int btrfs_ioctl_ino_lookup(struct file *file, | |
1973 | void __user *argp) | |
1974 | { | |
1975 | struct btrfs_ioctl_ino_lookup_args *args; | |
1976 | struct inode *inode; | |
1977 | int ret; | |
1978 | ||
1979 | if (!capable(CAP_SYS_ADMIN)) | |
1980 | return -EPERM; | |
1981 | ||
2354d08f JL |
1982 | args = memdup_user(argp, sizeof(*args)); |
1983 | if (IS_ERR(args)) | |
1984 | return PTR_ERR(args); | |
c2b96929 | 1985 | |
ac8e9819 CM |
1986 | inode = fdentry(file)->d_inode; |
1987 | ||
1b53ac4d CM |
1988 | if (args->treeid == 0) |
1989 | args->treeid = BTRFS_I(inode)->root->root_key.objectid; | |
1990 | ||
ac8e9819 CM |
1991 | ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, |
1992 | args->treeid, args->objectid, | |
1993 | args->name); | |
1994 | ||
1995 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
1996 | ret = -EFAULT; | |
1997 | ||
1998 | kfree(args); | |
98d377a0 TH |
1999 | return ret; |
2000 | } | |
2001 | ||
76dda93c YZ |
2002 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
2003 | void __user *arg) | |
2004 | { | |
2005 | struct dentry *parent = fdentry(file); | |
2006 | struct dentry *dentry; | |
2007 | struct inode *dir = parent->d_inode; | |
2008 | struct inode *inode; | |
2009 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2010 | struct btrfs_root *dest = NULL; | |
2011 | struct btrfs_ioctl_vol_args *vol_args; | |
2012 | struct btrfs_trans_handle *trans; | |
2013 | int namelen; | |
2014 | int ret; | |
2015 | int err = 0; | |
2016 | ||
76dda93c YZ |
2017 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
2018 | if (IS_ERR(vol_args)) | |
2019 | return PTR_ERR(vol_args); | |
2020 | ||
2021 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
2022 | namelen = strlen(vol_args->name); | |
2023 | if (strchr(vol_args->name, '/') || | |
2024 | strncmp(vol_args->name, "..", namelen) == 0) { | |
2025 | err = -EINVAL; | |
2026 | goto out; | |
2027 | } | |
2028 | ||
a561be71 | 2029 | err = mnt_want_write_file(file); |
76dda93c YZ |
2030 | if (err) |
2031 | goto out; | |
2032 | ||
2033 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
2034 | dentry = lookup_one_len(vol_args->name, parent, namelen); | |
2035 | if (IS_ERR(dentry)) { | |
2036 | err = PTR_ERR(dentry); | |
2037 | goto out_unlock_dir; | |
2038 | } | |
2039 | ||
2040 | if (!dentry->d_inode) { | |
2041 | err = -ENOENT; | |
2042 | goto out_dput; | |
2043 | } | |
2044 | ||
2045 | inode = dentry->d_inode; | |
4260f7c7 SW |
2046 | dest = BTRFS_I(inode)->root; |
2047 | if (!capable(CAP_SYS_ADMIN)){ | |
2048 | /* | |
2049 | * Regular user. Only allow this with a special mount | |
2050 | * option, when the user has write+exec access to the | |
2051 | * subvol root, and when rmdir(2) would have been | |
2052 | * allowed. | |
2053 | * | |
2054 | * Note that this is _not_ check that the subvol is | |
2055 | * empty or doesn't contain data that we wouldn't | |
2056 | * otherwise be able to delete. | |
2057 | * | |
2058 | * Users who want to delete empty subvols should try | |
2059 | * rmdir(2). | |
2060 | */ | |
2061 | err = -EPERM; | |
2062 | if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
2063 | goto out_dput; | |
2064 | ||
2065 | /* | |
2066 | * Do not allow deletion if the parent dir is the same | |
2067 | * as the dir to be deleted. That means the ioctl | |
2068 | * must be called on the dentry referencing the root | |
2069 | * of the subvol, not a random directory contained | |
2070 | * within it. | |
2071 | */ | |
2072 | err = -EINVAL; | |
2073 | if (root == dest) | |
2074 | goto out_dput; | |
2075 | ||
2076 | err = inode_permission(inode, MAY_WRITE | MAY_EXEC); | |
2077 | if (err) | |
2078 | goto out_dput; | |
2079 | ||
2080 | /* check if subvolume may be deleted by a non-root user */ | |
2081 | err = btrfs_may_delete(dir, dentry, 1); | |
2082 | if (err) | |
2083 | goto out_dput; | |
2084 | } | |
2085 | ||
33345d01 | 2086 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
76dda93c YZ |
2087 | err = -EINVAL; |
2088 | goto out_dput; | |
2089 | } | |
2090 | ||
76dda93c YZ |
2091 | mutex_lock(&inode->i_mutex); |
2092 | err = d_invalidate(dentry); | |
2093 | if (err) | |
2094 | goto out_unlock; | |
2095 | ||
2096 | down_write(&root->fs_info->subvol_sem); | |
2097 | ||
2098 | err = may_destroy_subvol(dest); | |
2099 | if (err) | |
2100 | goto out_up_write; | |
2101 | ||
a22285a6 YZ |
2102 | trans = btrfs_start_transaction(root, 0); |
2103 | if (IS_ERR(trans)) { | |
2104 | err = PTR_ERR(trans); | |
d327099a | 2105 | goto out_up_write; |
a22285a6 YZ |
2106 | } |
2107 | trans->block_rsv = &root->fs_info->global_block_rsv; | |
2108 | ||
76dda93c YZ |
2109 | ret = btrfs_unlink_subvol(trans, root, dir, |
2110 | dest->root_key.objectid, | |
2111 | dentry->d_name.name, | |
2112 | dentry->d_name.len); | |
79787eaa JM |
2113 | if (ret) { |
2114 | err = ret; | |
2115 | btrfs_abort_transaction(trans, root, ret); | |
2116 | goto out_end_trans; | |
2117 | } | |
76dda93c YZ |
2118 | |
2119 | btrfs_record_root_in_trans(trans, dest); | |
2120 | ||
2121 | memset(&dest->root_item.drop_progress, 0, | |
2122 | sizeof(dest->root_item.drop_progress)); | |
2123 | dest->root_item.drop_level = 0; | |
2124 | btrfs_set_root_refs(&dest->root_item, 0); | |
2125 | ||
d68fc57b YZ |
2126 | if (!xchg(&dest->orphan_item_inserted, 1)) { |
2127 | ret = btrfs_insert_orphan_item(trans, | |
2128 | root->fs_info->tree_root, | |
2129 | dest->root_key.objectid); | |
79787eaa JM |
2130 | if (ret) { |
2131 | btrfs_abort_transaction(trans, root, ret); | |
2132 | err = ret; | |
2133 | goto out_end_trans; | |
2134 | } | |
d68fc57b | 2135 | } |
79787eaa | 2136 | out_end_trans: |
531cb13f | 2137 | ret = btrfs_end_transaction(trans, root); |
79787eaa JM |
2138 | if (ret && !err) |
2139 | err = ret; | |
76dda93c YZ |
2140 | inode->i_flags |= S_DEAD; |
2141 | out_up_write: | |
2142 | up_write(&root->fs_info->subvol_sem); | |
2143 | out_unlock: | |
2144 | mutex_unlock(&inode->i_mutex); | |
2145 | if (!err) { | |
efefb143 | 2146 | shrink_dcache_sb(root->fs_info->sb); |
76dda93c YZ |
2147 | btrfs_invalidate_inodes(dest); |
2148 | d_delete(dentry); | |
2149 | } | |
2150 | out_dput: | |
2151 | dput(dentry); | |
2152 | out_unlock_dir: | |
2153 | mutex_unlock(&dir->i_mutex); | |
2a79f17e | 2154 | mnt_drop_write_file(file); |
76dda93c YZ |
2155 | out: |
2156 | kfree(vol_args); | |
2157 | return err; | |
2158 | } | |
2159 | ||
1e701a32 | 2160 | static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
f46b5a66 CH |
2161 | { |
2162 | struct inode *inode = fdentry(file)->d_inode; | |
2163 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1e701a32 | 2164 | struct btrfs_ioctl_defrag_range_args *range; |
c146afad YZ |
2165 | int ret; |
2166 | ||
b83cc969 LZ |
2167 | if (btrfs_root_readonly(root)) |
2168 | return -EROFS; | |
2169 | ||
5ac00add SB |
2170 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
2171 | 1)) { | |
2172 | pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); | |
2173 | return -EINPROGRESS; | |
2174 | } | |
a561be71 | 2175 | ret = mnt_want_write_file(file); |
5ac00add SB |
2176 | if (ret) { |
2177 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, | |
2178 | 0); | |
c146afad | 2179 | return ret; |
5ac00add | 2180 | } |
f46b5a66 CH |
2181 | |
2182 | switch (inode->i_mode & S_IFMT) { | |
2183 | case S_IFDIR: | |
e441d54d CM |
2184 | if (!capable(CAP_SYS_ADMIN)) { |
2185 | ret = -EPERM; | |
2186 | goto out; | |
2187 | } | |
8929ecfa YZ |
2188 | ret = btrfs_defrag_root(root, 0); |
2189 | if (ret) | |
2190 | goto out; | |
2191 | ret = btrfs_defrag_root(root->fs_info->extent_root, 0); | |
f46b5a66 CH |
2192 | break; |
2193 | case S_IFREG: | |
e441d54d CM |
2194 | if (!(file->f_mode & FMODE_WRITE)) { |
2195 | ret = -EINVAL; | |
2196 | goto out; | |
2197 | } | |
1e701a32 CM |
2198 | |
2199 | range = kzalloc(sizeof(*range), GFP_KERNEL); | |
2200 | if (!range) { | |
2201 | ret = -ENOMEM; | |
2202 | goto out; | |
2203 | } | |
2204 | ||
2205 | if (argp) { | |
2206 | if (copy_from_user(range, argp, | |
2207 | sizeof(*range))) { | |
2208 | ret = -EFAULT; | |
2209 | kfree(range); | |
683be16e | 2210 | goto out; |
1e701a32 CM |
2211 | } |
2212 | /* compression requires us to start the IO */ | |
2213 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
2214 | range->flags |= BTRFS_DEFRAG_RANGE_START_IO; | |
2215 | range->extent_thresh = (u32)-1; | |
2216 | } | |
2217 | } else { | |
2218 | /* the rest are all set to zero by kzalloc */ | |
2219 | range->len = (u64)-1; | |
2220 | } | |
4cb5300b CM |
2221 | ret = btrfs_defrag_file(fdentry(file)->d_inode, file, |
2222 | range, 0, 0); | |
2223 | if (ret > 0) | |
2224 | ret = 0; | |
1e701a32 | 2225 | kfree(range); |
f46b5a66 | 2226 | break; |
8929ecfa YZ |
2227 | default: |
2228 | ret = -EINVAL; | |
f46b5a66 | 2229 | } |
e441d54d | 2230 | out: |
2a79f17e | 2231 | mnt_drop_write_file(file); |
5ac00add | 2232 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
e441d54d | 2233 | return ret; |
f46b5a66 CH |
2234 | } |
2235 | ||
b2950863 | 2236 | static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
2237 | { |
2238 | struct btrfs_ioctl_vol_args *vol_args; | |
2239 | int ret; | |
2240 | ||
e441d54d CM |
2241 | if (!capable(CAP_SYS_ADMIN)) |
2242 | return -EPERM; | |
2243 | ||
5ac00add SB |
2244 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
2245 | 1)) { | |
2246 | pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); | |
2247 | return -EINPROGRESS; | |
c9e9f97b ID |
2248 | } |
2249 | ||
5ac00add | 2250 | mutex_lock(&root->fs_info->volume_mutex); |
dae7b665 | 2251 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2252 | if (IS_ERR(vol_args)) { |
2253 | ret = PTR_ERR(vol_args); | |
2254 | goto out; | |
2255 | } | |
f46b5a66 | 2256 | |
5516e595 | 2257 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
2258 | ret = btrfs_init_new_device(root, vol_args->name); |
2259 | ||
f46b5a66 | 2260 | kfree(vol_args); |
c9e9f97b ID |
2261 | out: |
2262 | mutex_unlock(&root->fs_info->volume_mutex); | |
5ac00add | 2263 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
f46b5a66 CH |
2264 | return ret; |
2265 | } | |
2266 | ||
b2950863 | 2267 | static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
2268 | { |
2269 | struct btrfs_ioctl_vol_args *vol_args; | |
2270 | int ret; | |
2271 | ||
e441d54d CM |
2272 | if (!capable(CAP_SYS_ADMIN)) |
2273 | return -EPERM; | |
2274 | ||
c146afad YZ |
2275 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
2276 | return -EROFS; | |
2277 | ||
5ac00add SB |
2278 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
2279 | 1)) { | |
2280 | pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); | |
2281 | return -EINPROGRESS; | |
c9e9f97b ID |
2282 | } |
2283 | ||
5ac00add | 2284 | mutex_lock(&root->fs_info->volume_mutex); |
dae7b665 | 2285 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2286 | if (IS_ERR(vol_args)) { |
2287 | ret = PTR_ERR(vol_args); | |
2288 | goto out; | |
2289 | } | |
f46b5a66 | 2290 | |
5516e595 | 2291 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
2292 | ret = btrfs_rm_device(root, vol_args->name); |
2293 | ||
f46b5a66 | 2294 | kfree(vol_args); |
c9e9f97b ID |
2295 | out: |
2296 | mutex_unlock(&root->fs_info->volume_mutex); | |
5ac00add | 2297 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
f46b5a66 CH |
2298 | return ret; |
2299 | } | |
2300 | ||
475f6387 JS |
2301 | static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) |
2302 | { | |
027ed2f0 | 2303 | struct btrfs_ioctl_fs_info_args *fi_args; |
475f6387 JS |
2304 | struct btrfs_device *device; |
2305 | struct btrfs_device *next; | |
2306 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
027ed2f0 | 2307 | int ret = 0; |
475f6387 JS |
2308 | |
2309 | if (!capable(CAP_SYS_ADMIN)) | |
2310 | return -EPERM; | |
2311 | ||
027ed2f0 LZ |
2312 | fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); |
2313 | if (!fi_args) | |
2314 | return -ENOMEM; | |
2315 | ||
2316 | fi_args->num_devices = fs_devices->num_devices; | |
2317 | memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); | |
475f6387 JS |
2318 | |
2319 | mutex_lock(&fs_devices->device_list_mutex); | |
2320 | list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { | |
027ed2f0 LZ |
2321 | if (device->devid > fi_args->max_id) |
2322 | fi_args->max_id = device->devid; | |
475f6387 JS |
2323 | } |
2324 | mutex_unlock(&fs_devices->device_list_mutex); | |
2325 | ||
027ed2f0 LZ |
2326 | if (copy_to_user(arg, fi_args, sizeof(*fi_args))) |
2327 | ret = -EFAULT; | |
475f6387 | 2328 | |
027ed2f0 LZ |
2329 | kfree(fi_args); |
2330 | return ret; | |
475f6387 JS |
2331 | } |
2332 | ||
2333 | static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) | |
2334 | { | |
2335 | struct btrfs_ioctl_dev_info_args *di_args; | |
2336 | struct btrfs_device *dev; | |
2337 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
2338 | int ret = 0; | |
2339 | char *s_uuid = NULL; | |
2340 | char empty_uuid[BTRFS_UUID_SIZE] = {0}; | |
2341 | ||
2342 | if (!capable(CAP_SYS_ADMIN)) | |
2343 | return -EPERM; | |
2344 | ||
2345 | di_args = memdup_user(arg, sizeof(*di_args)); | |
2346 | if (IS_ERR(di_args)) | |
2347 | return PTR_ERR(di_args); | |
2348 | ||
2349 | if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0) | |
2350 | s_uuid = di_args->uuid; | |
2351 | ||
2352 | mutex_lock(&fs_devices->device_list_mutex); | |
aa1b8cd4 | 2353 | dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); |
475f6387 JS |
2354 | mutex_unlock(&fs_devices->device_list_mutex); |
2355 | ||
2356 | if (!dev) { | |
2357 | ret = -ENODEV; | |
2358 | goto out; | |
2359 | } | |
2360 | ||
2361 | di_args->devid = dev->devid; | |
2362 | di_args->bytes_used = dev->bytes_used; | |
2363 | di_args->total_bytes = dev->total_bytes; | |
2364 | memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); | |
a27202fb | 2365 | if (dev->name) { |
606686ee JB |
2366 | struct rcu_string *name; |
2367 | ||
2368 | rcu_read_lock(); | |
2369 | name = rcu_dereference(dev->name); | |
2370 | strncpy(di_args->path, name->str, sizeof(di_args->path)); | |
2371 | rcu_read_unlock(); | |
a27202fb JM |
2372 | di_args->path[sizeof(di_args->path) - 1] = 0; |
2373 | } else { | |
99ba55ad | 2374 | di_args->path[0] = '\0'; |
a27202fb | 2375 | } |
475f6387 JS |
2376 | |
2377 | out: | |
2378 | if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) | |
2379 | ret = -EFAULT; | |
2380 | ||
2381 | kfree(di_args); | |
2382 | return ret; | |
2383 | } | |
2384 | ||
76dda93c YZ |
2385 | static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, |
2386 | u64 off, u64 olen, u64 destoff) | |
f46b5a66 CH |
2387 | { |
2388 | struct inode *inode = fdentry(file)->d_inode; | |
2389 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2903ff01 | 2390 | struct fd src_file; |
f46b5a66 CH |
2391 | struct inode *src; |
2392 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 2393 | struct btrfs_path *path; |
f46b5a66 | 2394 | struct extent_buffer *leaf; |
ae01a0ab YZ |
2395 | char *buf; |
2396 | struct btrfs_key key; | |
f46b5a66 CH |
2397 | u32 nritems; |
2398 | int slot; | |
ae01a0ab | 2399 | int ret; |
c5c9cd4d SW |
2400 | u64 len = olen; |
2401 | u64 bs = root->fs_info->sb->s_blocksize; | |
d20f7043 | 2402 | |
c5c9cd4d SW |
2403 | /* |
2404 | * TODO: | |
2405 | * - split compressed inline extents. annoying: we need to | |
2406 | * decompress into destination's address_space (the file offset | |
2407 | * may change, so source mapping won't do), then recompress (or | |
2408 | * otherwise reinsert) a subrange. | |
2409 | * - allow ranges within the same file to be cloned (provided | |
2410 | * they don't overlap)? | |
2411 | */ | |
2412 | ||
e441d54d | 2413 | /* the destination must be opened for writing */ |
2ebc3464 | 2414 | if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) |
e441d54d CM |
2415 | return -EINVAL; |
2416 | ||
b83cc969 LZ |
2417 | if (btrfs_root_readonly(root)) |
2418 | return -EROFS; | |
2419 | ||
a561be71 | 2420 | ret = mnt_want_write_file(file); |
c146afad YZ |
2421 | if (ret) |
2422 | return ret; | |
2423 | ||
2903ff01 AV |
2424 | src_file = fdget(srcfd); |
2425 | if (!src_file.file) { | |
ab67b7c1 YZ |
2426 | ret = -EBADF; |
2427 | goto out_drop_write; | |
2428 | } | |
5dc64164 | 2429 | |
362a20c5 | 2430 | ret = -EXDEV; |
2903ff01 | 2431 | if (src_file.file->f_path.mnt != file->f_path.mnt) |
362a20c5 DS |
2432 | goto out_fput; |
2433 | ||
2903ff01 | 2434 | src = src_file.file->f_dentry->d_inode; |
f46b5a66 | 2435 | |
c5c9cd4d SW |
2436 | ret = -EINVAL; |
2437 | if (src == inode) | |
2438 | goto out_fput; | |
2439 | ||
5dc64164 | 2440 | /* the src must be open for reading */ |
2903ff01 | 2441 | if (!(src_file.file->f_mode & FMODE_READ)) |
5dc64164 DR |
2442 | goto out_fput; |
2443 | ||
0e7b824c LZ |
2444 | /* don't make the dst file partly checksummed */ |
2445 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != | |
2446 | (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) | |
2447 | goto out_fput; | |
2448 | ||
ae01a0ab YZ |
2449 | ret = -EISDIR; |
2450 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) | |
2451 | goto out_fput; | |
2452 | ||
f46b5a66 | 2453 | ret = -EXDEV; |
362a20c5 | 2454 | if (src->i_sb != inode->i_sb) |
ae01a0ab YZ |
2455 | goto out_fput; |
2456 | ||
2457 | ret = -ENOMEM; | |
2458 | buf = vmalloc(btrfs_level_size(root, 0)); | |
2459 | if (!buf) | |
2460 | goto out_fput; | |
2461 | ||
2462 | path = btrfs_alloc_path(); | |
2463 | if (!path) { | |
2464 | vfree(buf); | |
f46b5a66 | 2465 | goto out_fput; |
ae01a0ab YZ |
2466 | } |
2467 | path->reada = 2; | |
f46b5a66 CH |
2468 | |
2469 | if (inode < src) { | |
fccdae43 SW |
2470 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); |
2471 | mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); | |
f46b5a66 | 2472 | } else { |
fccdae43 SW |
2473 | mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); |
2474 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); | |
f46b5a66 CH |
2475 | } |
2476 | ||
c5c9cd4d SW |
2477 | /* determine range to clone */ |
2478 | ret = -EINVAL; | |
2ebc3464 | 2479 | if (off + len > src->i_size || off + len < off) |
f46b5a66 | 2480 | goto out_unlock; |
c5c9cd4d SW |
2481 | if (len == 0) |
2482 | olen = len = src->i_size - off; | |
2483 | /* if we extend to eof, continue to block boundary */ | |
2484 | if (off + len == src->i_size) | |
2a6b8dae | 2485 | len = ALIGN(src->i_size, bs) - off; |
c5c9cd4d SW |
2486 | |
2487 | /* verify the end result is block aligned */ | |
2a6b8dae LZ |
2488 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || |
2489 | !IS_ALIGNED(destoff, bs)) | |
c5c9cd4d SW |
2490 | goto out_unlock; |
2491 | ||
d525e8ab LZ |
2492 | if (destoff > inode->i_size) { |
2493 | ret = btrfs_cont_expand(inode, inode->i_size, destoff); | |
2494 | if (ret) | |
2495 | goto out_unlock; | |
2496 | } | |
2497 | ||
71ef0786 LZ |
2498 | /* truncate page cache pages from target inode range */ |
2499 | truncate_inode_pages_range(&inode->i_data, destoff, | |
2500 | PAGE_CACHE_ALIGN(destoff + len) - 1); | |
2501 | ||
f46b5a66 CH |
2502 | /* do any pending delalloc/csum calc on src, one way or |
2503 | another, and lock file content */ | |
2504 | while (1) { | |
31840ae1 | 2505 | struct btrfs_ordered_extent *ordered; |
aa42ffd9 LB |
2506 | lock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); |
2507 | ordered = btrfs_lookup_first_ordered_extent(src, off + len - 1); | |
9a019196 | 2508 | if (!ordered && |
aa42ffd9 LB |
2509 | !test_range_bit(&BTRFS_I(src)->io_tree, off, off + len - 1, |
2510 | EXTENT_DELALLOC, 0, NULL)) | |
f46b5a66 | 2511 | break; |
aa42ffd9 | 2512 | unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); |
ae01a0ab YZ |
2513 | if (ordered) |
2514 | btrfs_put_ordered_extent(ordered); | |
9a019196 | 2515 | btrfs_wait_ordered_range(src, off, len); |
f46b5a66 CH |
2516 | } |
2517 | ||
c5c9cd4d | 2518 | /* clone data */ |
33345d01 | 2519 | key.objectid = btrfs_ino(src); |
ae01a0ab YZ |
2520 | key.type = BTRFS_EXTENT_DATA_KEY; |
2521 | key.offset = 0; | |
f46b5a66 CH |
2522 | |
2523 | while (1) { | |
2524 | /* | |
2525 | * note the key will change type as we walk through the | |
2526 | * tree. | |
2527 | */ | |
362a20c5 DS |
2528 | ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, |
2529 | 0, 0); | |
f46b5a66 CH |
2530 | if (ret < 0) |
2531 | goto out; | |
2532 | ||
ae01a0ab YZ |
2533 | nritems = btrfs_header_nritems(path->nodes[0]); |
2534 | if (path->slots[0] >= nritems) { | |
362a20c5 | 2535 | ret = btrfs_next_leaf(BTRFS_I(src)->root, path); |
f46b5a66 CH |
2536 | if (ret < 0) |
2537 | goto out; | |
2538 | if (ret > 0) | |
2539 | break; | |
ae01a0ab | 2540 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
2541 | } |
2542 | leaf = path->nodes[0]; | |
2543 | slot = path->slots[0]; | |
f46b5a66 | 2544 | |
ae01a0ab | 2545 | btrfs_item_key_to_cpu(leaf, &key, slot); |
d20f7043 | 2546 | if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || |
33345d01 | 2547 | key.objectid != btrfs_ino(src)) |
f46b5a66 CH |
2548 | break; |
2549 | ||
c5c9cd4d SW |
2550 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
2551 | struct btrfs_file_extent_item *extent; | |
2552 | int type; | |
31840ae1 ZY |
2553 | u32 size; |
2554 | struct btrfs_key new_key; | |
c5c9cd4d SW |
2555 | u64 disko = 0, diskl = 0; |
2556 | u64 datao = 0, datal = 0; | |
2557 | u8 comp; | |
b5384d48 | 2558 | u64 endoff; |
31840ae1 ZY |
2559 | |
2560 | size = btrfs_item_size_nr(leaf, slot); | |
2561 | read_extent_buffer(leaf, buf, | |
2562 | btrfs_item_ptr_offset(leaf, slot), | |
2563 | size); | |
c5c9cd4d SW |
2564 | |
2565 | extent = btrfs_item_ptr(leaf, slot, | |
2566 | struct btrfs_file_extent_item); | |
2567 | comp = btrfs_file_extent_compression(leaf, extent); | |
2568 | type = btrfs_file_extent_type(leaf, extent); | |
c8a894d7 CM |
2569 | if (type == BTRFS_FILE_EXTENT_REG || |
2570 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d397712b CM |
2571 | disko = btrfs_file_extent_disk_bytenr(leaf, |
2572 | extent); | |
2573 | diskl = btrfs_file_extent_disk_num_bytes(leaf, | |
2574 | extent); | |
c5c9cd4d | 2575 | datao = btrfs_file_extent_offset(leaf, extent); |
d397712b CM |
2576 | datal = btrfs_file_extent_num_bytes(leaf, |
2577 | extent); | |
c5c9cd4d SW |
2578 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
2579 | /* take upper bound, may be compressed */ | |
2580 | datal = btrfs_file_extent_ram_bytes(leaf, | |
2581 | extent); | |
2582 | } | |
b3b4aa74 | 2583 | btrfs_release_path(path); |
31840ae1 | 2584 | |
050006a7 | 2585 | if (key.offset + datal <= off || |
aa42ffd9 | 2586 | key.offset >= off + len - 1) |
c5c9cd4d SW |
2587 | goto next; |
2588 | ||
31840ae1 | 2589 | memcpy(&new_key, &key, sizeof(new_key)); |
33345d01 | 2590 | new_key.objectid = btrfs_ino(inode); |
4d728ec7 LZ |
2591 | if (off <= key.offset) |
2592 | new_key.offset = key.offset + destoff - off; | |
2593 | else | |
2594 | new_key.offset = destoff; | |
31840ae1 | 2595 | |
b6f3409b SW |
2596 | /* |
2597 | * 1 - adjusting old extent (we may have to split it) | |
2598 | * 1 - add new extent | |
2599 | * 1 - inode update | |
2600 | */ | |
2601 | trans = btrfs_start_transaction(root, 3); | |
a22285a6 YZ |
2602 | if (IS_ERR(trans)) { |
2603 | ret = PTR_ERR(trans); | |
2604 | goto out; | |
2605 | } | |
2606 | ||
c8a894d7 CM |
2607 | if (type == BTRFS_FILE_EXTENT_REG || |
2608 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d72c0842 LZ |
2609 | /* |
2610 | * a | --- range to clone ---| b | |
2611 | * | ------------- extent ------------- | | |
2612 | */ | |
2613 | ||
2614 | /* substract range b */ | |
2615 | if (key.offset + datal > off + len) | |
2616 | datal = off + len - key.offset; | |
2617 | ||
2618 | /* substract range a */ | |
a22285a6 YZ |
2619 | if (off > key.offset) { |
2620 | datao += off - key.offset; | |
2621 | datal -= off - key.offset; | |
2622 | } | |
2623 | ||
5dc562c5 | 2624 | ret = btrfs_drop_extents(trans, root, inode, |
a22285a6 YZ |
2625 | new_key.offset, |
2626 | new_key.offset + datal, | |
2671485d | 2627 | 1); |
79787eaa JM |
2628 | if (ret) { |
2629 | btrfs_abort_transaction(trans, root, | |
2630 | ret); | |
2631 | btrfs_end_transaction(trans, root); | |
2632 | goto out; | |
2633 | } | |
a22285a6 | 2634 | |
c5c9cd4d SW |
2635 | ret = btrfs_insert_empty_item(trans, root, path, |
2636 | &new_key, size); | |
79787eaa JM |
2637 | if (ret) { |
2638 | btrfs_abort_transaction(trans, root, | |
2639 | ret); | |
2640 | btrfs_end_transaction(trans, root); | |
2641 | goto out; | |
2642 | } | |
c5c9cd4d SW |
2643 | |
2644 | leaf = path->nodes[0]; | |
2645 | slot = path->slots[0]; | |
2646 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
2647 | btrfs_item_ptr_offset(leaf, slot), |
2648 | size); | |
ae01a0ab | 2649 | |
c5c9cd4d | 2650 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 2651 | struct btrfs_file_extent_item); |
c5c9cd4d | 2652 | |
c5c9cd4d SW |
2653 | /* disko == 0 means it's a hole */ |
2654 | if (!disko) | |
2655 | datao = 0; | |
c5c9cd4d SW |
2656 | |
2657 | btrfs_set_file_extent_offset(leaf, extent, | |
2658 | datao); | |
2659 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
2660 | datal); | |
2661 | if (disko) { | |
2662 | inode_add_bytes(inode, datal); | |
ae01a0ab | 2663 | ret = btrfs_inc_extent_ref(trans, root, |
5d4f98a2 YZ |
2664 | disko, diskl, 0, |
2665 | root->root_key.objectid, | |
33345d01 | 2666 | btrfs_ino(inode), |
66d7e7f0 AJ |
2667 | new_key.offset - datao, |
2668 | 0); | |
79787eaa JM |
2669 | if (ret) { |
2670 | btrfs_abort_transaction(trans, | |
2671 | root, | |
2672 | ret); | |
2673 | btrfs_end_transaction(trans, | |
2674 | root); | |
2675 | goto out; | |
2676 | ||
2677 | } | |
f46b5a66 | 2678 | } |
c5c9cd4d SW |
2679 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
2680 | u64 skip = 0; | |
2681 | u64 trim = 0; | |
2682 | if (off > key.offset) { | |
2683 | skip = off - key.offset; | |
2684 | new_key.offset += skip; | |
2685 | } | |
d397712b | 2686 | |
aa42ffd9 LB |
2687 | if (key.offset + datal > off + len) |
2688 | trim = key.offset + datal - (off + len); | |
d397712b | 2689 | |
c5c9cd4d | 2690 | if (comp && (skip || trim)) { |
c5c9cd4d | 2691 | ret = -EINVAL; |
a22285a6 | 2692 | btrfs_end_transaction(trans, root); |
c5c9cd4d SW |
2693 | goto out; |
2694 | } | |
2695 | size -= skip + trim; | |
2696 | datal -= skip + trim; | |
a22285a6 | 2697 | |
5dc562c5 | 2698 | ret = btrfs_drop_extents(trans, root, inode, |
a22285a6 YZ |
2699 | new_key.offset, |
2700 | new_key.offset + datal, | |
2671485d | 2701 | 1); |
79787eaa JM |
2702 | if (ret) { |
2703 | btrfs_abort_transaction(trans, root, | |
2704 | ret); | |
2705 | btrfs_end_transaction(trans, root); | |
2706 | goto out; | |
2707 | } | |
a22285a6 | 2708 | |
c5c9cd4d SW |
2709 | ret = btrfs_insert_empty_item(trans, root, path, |
2710 | &new_key, size); | |
79787eaa JM |
2711 | if (ret) { |
2712 | btrfs_abort_transaction(trans, root, | |
2713 | ret); | |
2714 | btrfs_end_transaction(trans, root); | |
2715 | goto out; | |
2716 | } | |
c5c9cd4d SW |
2717 | |
2718 | if (skip) { | |
d397712b CM |
2719 | u32 start = |
2720 | btrfs_file_extent_calc_inline_size(0); | |
c5c9cd4d SW |
2721 | memmove(buf+start, buf+start+skip, |
2722 | datal); | |
2723 | } | |
2724 | ||
2725 | leaf = path->nodes[0]; | |
2726 | slot = path->slots[0]; | |
2727 | write_extent_buffer(leaf, buf, | |
2728 | btrfs_item_ptr_offset(leaf, slot), | |
2729 | size); | |
2730 | inode_add_bytes(inode, datal); | |
f46b5a66 | 2731 | } |
c5c9cd4d SW |
2732 | |
2733 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 2734 | btrfs_release_path(path); |
c5c9cd4d | 2735 | |
0c4d2d95 | 2736 | inode_inc_iversion(inode); |
a22285a6 | 2737 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
b5384d48 SW |
2738 | |
2739 | /* | |
2740 | * we round up to the block size at eof when | |
2741 | * determining which extents to clone above, | |
2742 | * but shouldn't round up the file size | |
2743 | */ | |
2744 | endoff = new_key.offset + datal; | |
5f3888ff LZ |
2745 | if (endoff > destoff+olen) |
2746 | endoff = destoff+olen; | |
b5384d48 SW |
2747 | if (endoff > inode->i_size) |
2748 | btrfs_i_size_write(inode, endoff); | |
2749 | ||
a22285a6 | 2750 | ret = btrfs_update_inode(trans, root, inode); |
79787eaa JM |
2751 | if (ret) { |
2752 | btrfs_abort_transaction(trans, root, ret); | |
2753 | btrfs_end_transaction(trans, root); | |
2754 | goto out; | |
2755 | } | |
2756 | ret = btrfs_end_transaction(trans, root); | |
a22285a6 | 2757 | } |
d397712b | 2758 | next: |
b3b4aa74 | 2759 | btrfs_release_path(path); |
f46b5a66 | 2760 | key.offset++; |
f46b5a66 | 2761 | } |
f46b5a66 CH |
2762 | ret = 0; |
2763 | out: | |
b3b4aa74 | 2764 | btrfs_release_path(path); |
aa42ffd9 | 2765 | unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); |
f46b5a66 CH |
2766 | out_unlock: |
2767 | mutex_unlock(&src->i_mutex); | |
2768 | mutex_unlock(&inode->i_mutex); | |
ae01a0ab YZ |
2769 | vfree(buf); |
2770 | btrfs_free_path(path); | |
f46b5a66 | 2771 | out_fput: |
2903ff01 | 2772 | fdput(src_file); |
ab67b7c1 | 2773 | out_drop_write: |
2a79f17e | 2774 | mnt_drop_write_file(file); |
f46b5a66 CH |
2775 | return ret; |
2776 | } | |
2777 | ||
7a865e8a | 2778 | static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) |
c5c9cd4d SW |
2779 | { |
2780 | struct btrfs_ioctl_clone_range_args args; | |
2781 | ||
7a865e8a | 2782 | if (copy_from_user(&args, argp, sizeof(args))) |
c5c9cd4d SW |
2783 | return -EFAULT; |
2784 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, | |
2785 | args.src_length, args.dest_offset); | |
2786 | } | |
2787 | ||
f46b5a66 CH |
2788 | /* |
2789 | * there are many ways the trans_start and trans_end ioctls can lead | |
2790 | * to deadlocks. They should only be used by applications that | |
2791 | * basically own the machine, and have a very in depth understanding | |
2792 | * of all the possible deadlocks and enospc problems. | |
2793 | */ | |
b2950863 | 2794 | static long btrfs_ioctl_trans_start(struct file *file) |
f46b5a66 CH |
2795 | { |
2796 | struct inode *inode = fdentry(file)->d_inode; | |
2797 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2798 | struct btrfs_trans_handle *trans; | |
1ab86aed | 2799 | int ret; |
f46b5a66 | 2800 | |
1ab86aed | 2801 | ret = -EPERM; |
df5b5520 | 2802 | if (!capable(CAP_SYS_ADMIN)) |
1ab86aed | 2803 | goto out; |
df5b5520 | 2804 | |
1ab86aed SW |
2805 | ret = -EINPROGRESS; |
2806 | if (file->private_data) | |
f46b5a66 | 2807 | goto out; |
9ca9ee09 | 2808 | |
b83cc969 LZ |
2809 | ret = -EROFS; |
2810 | if (btrfs_root_readonly(root)) | |
2811 | goto out; | |
2812 | ||
a561be71 | 2813 | ret = mnt_want_write_file(file); |
c146afad YZ |
2814 | if (ret) |
2815 | goto out; | |
2816 | ||
a4abeea4 | 2817 | atomic_inc(&root->fs_info->open_ioctl_trans); |
9ca9ee09 | 2818 | |
1ab86aed | 2819 | ret = -ENOMEM; |
7a7eaa40 | 2820 | trans = btrfs_start_ioctl_transaction(root); |
abd30bb0 | 2821 | if (IS_ERR(trans)) |
1ab86aed SW |
2822 | goto out_drop; |
2823 | ||
2824 | file->private_data = trans; | |
2825 | return 0; | |
2826 | ||
2827 | out_drop: | |
a4abeea4 | 2828 | atomic_dec(&root->fs_info->open_ioctl_trans); |
2a79f17e | 2829 | mnt_drop_write_file(file); |
f46b5a66 | 2830 | out: |
f46b5a66 CH |
2831 | return ret; |
2832 | } | |
2833 | ||
6ef5ed0d JB |
2834 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
2835 | { | |
2836 | struct inode *inode = fdentry(file)->d_inode; | |
2837 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2838 | struct btrfs_root *new_root; | |
2839 | struct btrfs_dir_item *di; | |
2840 | struct btrfs_trans_handle *trans; | |
2841 | struct btrfs_path *path; | |
2842 | struct btrfs_key location; | |
2843 | struct btrfs_disk_key disk_key; | |
6ef5ed0d JB |
2844 | u64 objectid = 0; |
2845 | u64 dir_id; | |
2846 | ||
2847 | if (!capable(CAP_SYS_ADMIN)) | |
2848 | return -EPERM; | |
2849 | ||
2850 | if (copy_from_user(&objectid, argp, sizeof(objectid))) | |
2851 | return -EFAULT; | |
2852 | ||
2853 | if (!objectid) | |
2854 | objectid = root->root_key.objectid; | |
2855 | ||
2856 | location.objectid = objectid; | |
2857 | location.type = BTRFS_ROOT_ITEM_KEY; | |
2858 | location.offset = (u64)-1; | |
2859 | ||
2860 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
2861 | if (IS_ERR(new_root)) | |
2862 | return PTR_ERR(new_root); | |
2863 | ||
2864 | if (btrfs_root_refs(&new_root->root_item) == 0) | |
2865 | return -ENOENT; | |
2866 | ||
2867 | path = btrfs_alloc_path(); | |
2868 | if (!path) | |
2869 | return -ENOMEM; | |
2870 | path->leave_spinning = 1; | |
2871 | ||
2872 | trans = btrfs_start_transaction(root, 1); | |
98d5dc13 | 2873 | if (IS_ERR(trans)) { |
6ef5ed0d | 2874 | btrfs_free_path(path); |
98d5dc13 | 2875 | return PTR_ERR(trans); |
6ef5ed0d JB |
2876 | } |
2877 | ||
6c41761f | 2878 | dir_id = btrfs_super_root_dir(root->fs_info->super_copy); |
6ef5ed0d JB |
2879 | di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, |
2880 | dir_id, "default", 7, 1); | |
cf1e99a4 | 2881 | if (IS_ERR_OR_NULL(di)) { |
6ef5ed0d JB |
2882 | btrfs_free_path(path); |
2883 | btrfs_end_transaction(trans, root); | |
2884 | printk(KERN_ERR "Umm, you don't have the default dir item, " | |
2885 | "this isn't going to work\n"); | |
2886 | return -ENOENT; | |
2887 | } | |
2888 | ||
2889 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); | |
2890 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); | |
2891 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
2892 | btrfs_free_path(path); | |
2893 | ||
2b0ce2c2 | 2894 | btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); |
6ef5ed0d JB |
2895 | btrfs_end_transaction(trans, root); |
2896 | ||
2897 | return 0; | |
2898 | } | |
2899 | ||
5af3e8cc SB |
2900 | void btrfs_get_block_group_info(struct list_head *groups_list, |
2901 | struct btrfs_ioctl_space_info *space) | |
bf5fc093 JB |
2902 | { |
2903 | struct btrfs_block_group_cache *block_group; | |
2904 | ||
2905 | space->total_bytes = 0; | |
2906 | space->used_bytes = 0; | |
2907 | space->flags = 0; | |
2908 | list_for_each_entry(block_group, groups_list, list) { | |
2909 | space->flags = block_group->flags; | |
2910 | space->total_bytes += block_group->key.offset; | |
2911 | space->used_bytes += | |
2912 | btrfs_block_group_used(&block_group->item); | |
2913 | } | |
2914 | } | |
2915 | ||
1406e432 JB |
2916 | long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) |
2917 | { | |
2918 | struct btrfs_ioctl_space_args space_args; | |
2919 | struct btrfs_ioctl_space_info space; | |
2920 | struct btrfs_ioctl_space_info *dest; | |
7fde62bf | 2921 | struct btrfs_ioctl_space_info *dest_orig; |
13f2696f | 2922 | struct btrfs_ioctl_space_info __user *user_dest; |
1406e432 | 2923 | struct btrfs_space_info *info; |
bf5fc093 JB |
2924 | u64 types[] = {BTRFS_BLOCK_GROUP_DATA, |
2925 | BTRFS_BLOCK_GROUP_SYSTEM, | |
2926 | BTRFS_BLOCK_GROUP_METADATA, | |
2927 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; | |
2928 | int num_types = 4; | |
7fde62bf | 2929 | int alloc_size; |
1406e432 | 2930 | int ret = 0; |
51788b1b | 2931 | u64 slot_count = 0; |
bf5fc093 | 2932 | int i, c; |
1406e432 JB |
2933 | |
2934 | if (copy_from_user(&space_args, | |
2935 | (struct btrfs_ioctl_space_args __user *)arg, | |
2936 | sizeof(space_args))) | |
2937 | return -EFAULT; | |
2938 | ||
bf5fc093 JB |
2939 | for (i = 0; i < num_types; i++) { |
2940 | struct btrfs_space_info *tmp; | |
2941 | ||
2942 | info = NULL; | |
2943 | rcu_read_lock(); | |
2944 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
2945 | list) { | |
2946 | if (tmp->flags == types[i]) { | |
2947 | info = tmp; | |
2948 | break; | |
2949 | } | |
2950 | } | |
2951 | rcu_read_unlock(); | |
2952 | ||
2953 | if (!info) | |
2954 | continue; | |
2955 | ||
2956 | down_read(&info->groups_sem); | |
2957 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
2958 | if (!list_empty(&info->block_groups[c])) | |
2959 | slot_count++; | |
2960 | } | |
2961 | up_read(&info->groups_sem); | |
2962 | } | |
7fde62bf CM |
2963 | |
2964 | /* space_slots == 0 means they are asking for a count */ | |
2965 | if (space_args.space_slots == 0) { | |
2966 | space_args.total_spaces = slot_count; | |
2967 | goto out; | |
2968 | } | |
bf5fc093 | 2969 | |
51788b1b | 2970 | slot_count = min_t(u64, space_args.space_slots, slot_count); |
bf5fc093 | 2971 | |
7fde62bf | 2972 | alloc_size = sizeof(*dest) * slot_count; |
bf5fc093 | 2973 | |
7fde62bf CM |
2974 | /* we generally have at most 6 or so space infos, one for each raid |
2975 | * level. So, a whole page should be more than enough for everyone | |
2976 | */ | |
2977 | if (alloc_size > PAGE_CACHE_SIZE) | |
2978 | return -ENOMEM; | |
2979 | ||
1406e432 | 2980 | space_args.total_spaces = 0; |
7fde62bf CM |
2981 | dest = kmalloc(alloc_size, GFP_NOFS); |
2982 | if (!dest) | |
2983 | return -ENOMEM; | |
2984 | dest_orig = dest; | |
1406e432 | 2985 | |
7fde62bf | 2986 | /* now we have a buffer to copy into */ |
bf5fc093 JB |
2987 | for (i = 0; i < num_types; i++) { |
2988 | struct btrfs_space_info *tmp; | |
2989 | ||
51788b1b DR |
2990 | if (!slot_count) |
2991 | break; | |
2992 | ||
bf5fc093 JB |
2993 | info = NULL; |
2994 | rcu_read_lock(); | |
2995 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
2996 | list) { | |
2997 | if (tmp->flags == types[i]) { | |
2998 | info = tmp; | |
2999 | break; | |
3000 | } | |
3001 | } | |
3002 | rcu_read_unlock(); | |
7fde62bf | 3003 | |
bf5fc093 JB |
3004 | if (!info) |
3005 | continue; | |
3006 | down_read(&info->groups_sem); | |
3007 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
3008 | if (!list_empty(&info->block_groups[c])) { | |
5af3e8cc SB |
3009 | btrfs_get_block_group_info( |
3010 | &info->block_groups[c], &space); | |
bf5fc093 JB |
3011 | memcpy(dest, &space, sizeof(space)); |
3012 | dest++; | |
3013 | space_args.total_spaces++; | |
51788b1b | 3014 | slot_count--; |
bf5fc093 | 3015 | } |
51788b1b DR |
3016 | if (!slot_count) |
3017 | break; | |
bf5fc093 JB |
3018 | } |
3019 | up_read(&info->groups_sem); | |
1406e432 | 3020 | } |
1406e432 | 3021 | |
2eec6c81 | 3022 | user_dest = (struct btrfs_ioctl_space_info __user *) |
7fde62bf CM |
3023 | (arg + sizeof(struct btrfs_ioctl_space_args)); |
3024 | ||
3025 | if (copy_to_user(user_dest, dest_orig, alloc_size)) | |
3026 | ret = -EFAULT; | |
3027 | ||
3028 | kfree(dest_orig); | |
3029 | out: | |
3030 | if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) | |
1406e432 JB |
3031 | ret = -EFAULT; |
3032 | ||
3033 | return ret; | |
3034 | } | |
3035 | ||
f46b5a66 CH |
3036 | /* |
3037 | * there are many ways the trans_start and trans_end ioctls can lead | |
3038 | * to deadlocks. They should only be used by applications that | |
3039 | * basically own the machine, and have a very in depth understanding | |
3040 | * of all the possible deadlocks and enospc problems. | |
3041 | */ | |
3042 | long btrfs_ioctl_trans_end(struct file *file) | |
3043 | { | |
3044 | struct inode *inode = fdentry(file)->d_inode; | |
3045 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3046 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 3047 | |
f46b5a66 | 3048 | trans = file->private_data; |
1ab86aed SW |
3049 | if (!trans) |
3050 | return -EINVAL; | |
b214107e | 3051 | file->private_data = NULL; |
9ca9ee09 | 3052 | |
1ab86aed SW |
3053 | btrfs_end_transaction(trans, root); |
3054 | ||
a4abeea4 | 3055 | atomic_dec(&root->fs_info->open_ioctl_trans); |
9ca9ee09 | 3056 | |
2a79f17e | 3057 | mnt_drop_write_file(file); |
1ab86aed | 3058 | return 0; |
f46b5a66 CH |
3059 | } |
3060 | ||
9a8c28be MX |
3061 | static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, |
3062 | void __user *argp) | |
46204592 | 3063 | { |
46204592 SW |
3064 | struct btrfs_trans_handle *trans; |
3065 | u64 transid; | |
db5b493a | 3066 | int ret; |
46204592 | 3067 | |
ff7c1d33 MX |
3068 | trans = btrfs_attach_transaction(root); |
3069 | if (IS_ERR(trans)) { | |
3070 | if (PTR_ERR(trans) != -ENOENT) | |
3071 | return PTR_ERR(trans); | |
3072 | ||
3073 | /* No running transaction, don't bother */ | |
3074 | transid = root->fs_info->last_trans_committed; | |
3075 | goto out; | |
3076 | } | |
46204592 | 3077 | transid = trans->transid; |
db5b493a | 3078 | ret = btrfs_commit_transaction_async(trans, root, 0); |
8b2b2d3c TI |
3079 | if (ret) { |
3080 | btrfs_end_transaction(trans, root); | |
db5b493a | 3081 | return ret; |
8b2b2d3c | 3082 | } |
ff7c1d33 | 3083 | out: |
46204592 SW |
3084 | if (argp) |
3085 | if (copy_to_user(argp, &transid, sizeof(transid))) | |
3086 | return -EFAULT; | |
3087 | return 0; | |
3088 | } | |
3089 | ||
9a8c28be MX |
3090 | static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, |
3091 | void __user *argp) | |
46204592 | 3092 | { |
46204592 SW |
3093 | u64 transid; |
3094 | ||
3095 | if (argp) { | |
3096 | if (copy_from_user(&transid, argp, sizeof(transid))) | |
3097 | return -EFAULT; | |
3098 | } else { | |
3099 | transid = 0; /* current trans */ | |
3100 | } | |
3101 | return btrfs_wait_for_commit(root, transid); | |
3102 | } | |
3103 | ||
475f6387 JS |
3104 | static long btrfs_ioctl_scrub(struct btrfs_root *root, void __user *arg) |
3105 | { | |
3106 | int ret; | |
3107 | struct btrfs_ioctl_scrub_args *sa; | |
3108 | ||
3109 | if (!capable(CAP_SYS_ADMIN)) | |
3110 | return -EPERM; | |
3111 | ||
3112 | sa = memdup_user(arg, sizeof(*sa)); | |
3113 | if (IS_ERR(sa)) | |
3114 | return PTR_ERR(sa); | |
3115 | ||
aa1b8cd4 | 3116 | ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, |
63a212ab SB |
3117 | &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, |
3118 | 0); | |
475f6387 JS |
3119 | |
3120 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
3121 | ret = -EFAULT; | |
3122 | ||
3123 | kfree(sa); | |
3124 | return ret; | |
3125 | } | |
3126 | ||
3127 | static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) | |
3128 | { | |
3129 | if (!capable(CAP_SYS_ADMIN)) | |
3130 | return -EPERM; | |
3131 | ||
aa1b8cd4 | 3132 | return btrfs_scrub_cancel(root->fs_info); |
475f6387 JS |
3133 | } |
3134 | ||
3135 | static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, | |
3136 | void __user *arg) | |
3137 | { | |
3138 | struct btrfs_ioctl_scrub_args *sa; | |
3139 | int ret; | |
3140 | ||
3141 | if (!capable(CAP_SYS_ADMIN)) | |
3142 | return -EPERM; | |
3143 | ||
3144 | sa = memdup_user(arg, sizeof(*sa)); | |
3145 | if (IS_ERR(sa)) | |
3146 | return PTR_ERR(sa); | |
3147 | ||
3148 | ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); | |
3149 | ||
3150 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
3151 | ret = -EFAULT; | |
3152 | ||
3153 | kfree(sa); | |
3154 | return ret; | |
3155 | } | |
3156 | ||
c11d2c23 | 3157 | static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, |
b27f7c0c | 3158 | void __user *arg) |
c11d2c23 SB |
3159 | { |
3160 | struct btrfs_ioctl_get_dev_stats *sa; | |
3161 | int ret; | |
3162 | ||
c11d2c23 SB |
3163 | sa = memdup_user(arg, sizeof(*sa)); |
3164 | if (IS_ERR(sa)) | |
3165 | return PTR_ERR(sa); | |
3166 | ||
b27f7c0c DS |
3167 | if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { |
3168 | kfree(sa); | |
3169 | return -EPERM; | |
3170 | } | |
3171 | ||
3172 | ret = btrfs_get_dev_stats(root, sa); | |
c11d2c23 SB |
3173 | |
3174 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
3175 | ret = -EFAULT; | |
3176 | ||
3177 | kfree(sa); | |
3178 | return ret; | |
3179 | } | |
3180 | ||
3f6bcfbd SB |
3181 | static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) |
3182 | { | |
3183 | struct btrfs_ioctl_dev_replace_args *p; | |
3184 | int ret; | |
3185 | ||
3186 | if (!capable(CAP_SYS_ADMIN)) | |
3187 | return -EPERM; | |
3188 | ||
3189 | p = memdup_user(arg, sizeof(*p)); | |
3190 | if (IS_ERR(p)) | |
3191 | return PTR_ERR(p); | |
3192 | ||
3193 | switch (p->cmd) { | |
3194 | case BTRFS_IOCTL_DEV_REPLACE_CMD_START: | |
3195 | if (atomic_xchg( | |
3196 | &root->fs_info->mutually_exclusive_operation_running, | |
3197 | 1)) { | |
3198 | pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); | |
3199 | ret = -EINPROGRESS; | |
3200 | } else { | |
3201 | ret = btrfs_dev_replace_start(root, p); | |
3202 | atomic_set( | |
3203 | &root->fs_info->mutually_exclusive_operation_running, | |
3204 | 0); | |
3205 | } | |
3206 | break; | |
3207 | case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: | |
3208 | btrfs_dev_replace_status(root->fs_info, p); | |
3209 | ret = 0; | |
3210 | break; | |
3211 | case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: | |
3212 | ret = btrfs_dev_replace_cancel(root->fs_info, p); | |
3213 | break; | |
3214 | default: | |
3215 | ret = -EINVAL; | |
3216 | break; | |
3217 | } | |
3218 | ||
3219 | if (copy_to_user(arg, p, sizeof(*p))) | |
3220 | ret = -EFAULT; | |
3221 | ||
3222 | kfree(p); | |
3223 | return ret; | |
3224 | } | |
3225 | ||
d7728c96 JS |
3226 | static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) |
3227 | { | |
3228 | int ret = 0; | |
3229 | int i; | |
740c3d22 | 3230 | u64 rel_ptr; |
d7728c96 | 3231 | int size; |
806468f8 | 3232 | struct btrfs_ioctl_ino_path_args *ipa = NULL; |
d7728c96 JS |
3233 | struct inode_fs_paths *ipath = NULL; |
3234 | struct btrfs_path *path; | |
3235 | ||
3236 | if (!capable(CAP_SYS_ADMIN)) | |
3237 | return -EPERM; | |
3238 | ||
3239 | path = btrfs_alloc_path(); | |
3240 | if (!path) { | |
3241 | ret = -ENOMEM; | |
3242 | goto out; | |
3243 | } | |
3244 | ||
3245 | ipa = memdup_user(arg, sizeof(*ipa)); | |
3246 | if (IS_ERR(ipa)) { | |
3247 | ret = PTR_ERR(ipa); | |
3248 | ipa = NULL; | |
3249 | goto out; | |
3250 | } | |
3251 | ||
3252 | size = min_t(u32, ipa->size, 4096); | |
3253 | ipath = init_ipath(size, root, path); | |
3254 | if (IS_ERR(ipath)) { | |
3255 | ret = PTR_ERR(ipath); | |
3256 | ipath = NULL; | |
3257 | goto out; | |
3258 | } | |
3259 | ||
3260 | ret = paths_from_inode(ipa->inum, ipath); | |
3261 | if (ret < 0) | |
3262 | goto out; | |
3263 | ||
3264 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) { | |
745c4d8e JM |
3265 | rel_ptr = ipath->fspath->val[i] - |
3266 | (u64)(unsigned long)ipath->fspath->val; | |
740c3d22 | 3267 | ipath->fspath->val[i] = rel_ptr; |
d7728c96 JS |
3268 | } |
3269 | ||
745c4d8e JM |
3270 | ret = copy_to_user((void *)(unsigned long)ipa->fspath, |
3271 | (void *)(unsigned long)ipath->fspath, size); | |
d7728c96 JS |
3272 | if (ret) { |
3273 | ret = -EFAULT; | |
3274 | goto out; | |
3275 | } | |
3276 | ||
3277 | out: | |
3278 | btrfs_free_path(path); | |
3279 | free_ipath(ipath); | |
3280 | kfree(ipa); | |
3281 | ||
3282 | return ret; | |
3283 | } | |
3284 | ||
3285 | static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) | |
3286 | { | |
3287 | struct btrfs_data_container *inodes = ctx; | |
3288 | const size_t c = 3 * sizeof(u64); | |
3289 | ||
3290 | if (inodes->bytes_left >= c) { | |
3291 | inodes->bytes_left -= c; | |
3292 | inodes->val[inodes->elem_cnt] = inum; | |
3293 | inodes->val[inodes->elem_cnt + 1] = offset; | |
3294 | inodes->val[inodes->elem_cnt + 2] = root; | |
3295 | inodes->elem_cnt += 3; | |
3296 | } else { | |
3297 | inodes->bytes_missing += c - inodes->bytes_left; | |
3298 | inodes->bytes_left = 0; | |
3299 | inodes->elem_missed += 3; | |
3300 | } | |
3301 | ||
3302 | return 0; | |
3303 | } | |
3304 | ||
3305 | static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, | |
3306 | void __user *arg) | |
3307 | { | |
3308 | int ret = 0; | |
3309 | int size; | |
d7728c96 JS |
3310 | struct btrfs_ioctl_logical_ino_args *loi; |
3311 | struct btrfs_data_container *inodes = NULL; | |
3312 | struct btrfs_path *path = NULL; | |
d7728c96 JS |
3313 | |
3314 | if (!capable(CAP_SYS_ADMIN)) | |
3315 | return -EPERM; | |
3316 | ||
3317 | loi = memdup_user(arg, sizeof(*loi)); | |
3318 | if (IS_ERR(loi)) { | |
3319 | ret = PTR_ERR(loi); | |
3320 | loi = NULL; | |
3321 | goto out; | |
3322 | } | |
3323 | ||
3324 | path = btrfs_alloc_path(); | |
3325 | if (!path) { | |
3326 | ret = -ENOMEM; | |
3327 | goto out; | |
3328 | } | |
3329 | ||
425d17a2 | 3330 | size = min_t(u32, loi->size, 64 * 1024); |
d7728c96 JS |
3331 | inodes = init_data_container(size); |
3332 | if (IS_ERR(inodes)) { | |
3333 | ret = PTR_ERR(inodes); | |
3334 | inodes = NULL; | |
3335 | goto out; | |
3336 | } | |
3337 | ||
df031f07 LB |
3338 | ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, |
3339 | build_ino_list, inodes); | |
3340 | if (ret == -EINVAL) | |
d7728c96 JS |
3341 | ret = -ENOENT; |
3342 | if (ret < 0) | |
3343 | goto out; | |
3344 | ||
745c4d8e JM |
3345 | ret = copy_to_user((void *)(unsigned long)loi->inodes, |
3346 | (void *)(unsigned long)inodes, size); | |
d7728c96 JS |
3347 | if (ret) |
3348 | ret = -EFAULT; | |
3349 | ||
3350 | out: | |
3351 | btrfs_free_path(path); | |
425d17a2 | 3352 | vfree(inodes); |
d7728c96 JS |
3353 | kfree(loi); |
3354 | ||
3355 | return ret; | |
3356 | } | |
3357 | ||
19a39dce | 3358 | void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, |
c9e9f97b ID |
3359 | struct btrfs_ioctl_balance_args *bargs) |
3360 | { | |
3361 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
3362 | ||
3363 | bargs->flags = bctl->flags; | |
3364 | ||
837d5b6e ID |
3365 | if (atomic_read(&fs_info->balance_running)) |
3366 | bargs->state |= BTRFS_BALANCE_STATE_RUNNING; | |
3367 | if (atomic_read(&fs_info->balance_pause_req)) | |
3368 | bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; | |
a7e99c69 ID |
3369 | if (atomic_read(&fs_info->balance_cancel_req)) |
3370 | bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; | |
837d5b6e | 3371 | |
c9e9f97b ID |
3372 | memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); |
3373 | memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); | |
3374 | memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); | |
19a39dce ID |
3375 | |
3376 | if (lock) { | |
3377 | spin_lock(&fs_info->balance_lock); | |
3378 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
3379 | spin_unlock(&fs_info->balance_lock); | |
3380 | } else { | |
3381 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
3382 | } | |
c9e9f97b ID |
3383 | } |
3384 | ||
9ba1f6e4 | 3385 | static long btrfs_ioctl_balance(struct file *file, void __user *arg) |
c9e9f97b | 3386 | { |
9ba1f6e4 | 3387 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
c9e9f97b ID |
3388 | struct btrfs_fs_info *fs_info = root->fs_info; |
3389 | struct btrfs_ioctl_balance_args *bargs; | |
3390 | struct btrfs_balance_control *bctl; | |
3391 | int ret; | |
5ac00add | 3392 | int need_to_clear_lock = 0; |
c9e9f97b ID |
3393 | |
3394 | if (!capable(CAP_SYS_ADMIN)) | |
3395 | return -EPERM; | |
3396 | ||
e54bfa31 | 3397 | ret = mnt_want_write_file(file); |
9ba1f6e4 LB |
3398 | if (ret) |
3399 | return ret; | |
3400 | ||
c9e9f97b ID |
3401 | mutex_lock(&fs_info->volume_mutex); |
3402 | mutex_lock(&fs_info->balance_mutex); | |
3403 | ||
3404 | if (arg) { | |
3405 | bargs = memdup_user(arg, sizeof(*bargs)); | |
3406 | if (IS_ERR(bargs)) { | |
3407 | ret = PTR_ERR(bargs); | |
3408 | goto out; | |
3409 | } | |
de322263 ID |
3410 | |
3411 | if (bargs->flags & BTRFS_BALANCE_RESUME) { | |
3412 | if (!fs_info->balance_ctl) { | |
3413 | ret = -ENOTCONN; | |
3414 | goto out_bargs; | |
3415 | } | |
3416 | ||
3417 | bctl = fs_info->balance_ctl; | |
3418 | spin_lock(&fs_info->balance_lock); | |
3419 | bctl->flags |= BTRFS_BALANCE_RESUME; | |
3420 | spin_unlock(&fs_info->balance_lock); | |
3421 | ||
3422 | goto do_balance; | |
3423 | } | |
c9e9f97b ID |
3424 | } else { |
3425 | bargs = NULL; | |
3426 | } | |
3427 | ||
5ac00add SB |
3428 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
3429 | 1)) { | |
3430 | pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); | |
837d5b6e ID |
3431 | ret = -EINPROGRESS; |
3432 | goto out_bargs; | |
3433 | } | |
5ac00add | 3434 | need_to_clear_lock = 1; |
837d5b6e | 3435 | |
c9e9f97b ID |
3436 | bctl = kzalloc(sizeof(*bctl), GFP_NOFS); |
3437 | if (!bctl) { | |
3438 | ret = -ENOMEM; | |
3439 | goto out_bargs; | |
3440 | } | |
3441 | ||
3442 | bctl->fs_info = fs_info; | |
3443 | if (arg) { | |
3444 | memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); | |
3445 | memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); | |
3446 | memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); | |
3447 | ||
3448 | bctl->flags = bargs->flags; | |
f43ffb60 ID |
3449 | } else { |
3450 | /* balance everything - no filters */ | |
3451 | bctl->flags |= BTRFS_BALANCE_TYPE_MASK; | |
c9e9f97b ID |
3452 | } |
3453 | ||
de322263 | 3454 | do_balance: |
c9e9f97b ID |
3455 | ret = btrfs_balance(bctl, bargs); |
3456 | /* | |
837d5b6e ID |
3457 | * bctl is freed in __cancel_balance or in free_fs_info if |
3458 | * restriper was paused all the way until unmount | |
c9e9f97b ID |
3459 | */ |
3460 | if (arg) { | |
3461 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
3462 | ret = -EFAULT; | |
3463 | } | |
3464 | ||
3465 | out_bargs: | |
3466 | kfree(bargs); | |
3467 | out: | |
5ac00add SB |
3468 | if (need_to_clear_lock) |
3469 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, | |
3470 | 0); | |
c9e9f97b ID |
3471 | mutex_unlock(&fs_info->balance_mutex); |
3472 | mutex_unlock(&fs_info->volume_mutex); | |
e54bfa31 | 3473 | mnt_drop_write_file(file); |
c9e9f97b ID |
3474 | return ret; |
3475 | } | |
3476 | ||
837d5b6e ID |
3477 | static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) |
3478 | { | |
3479 | if (!capable(CAP_SYS_ADMIN)) | |
3480 | return -EPERM; | |
3481 | ||
3482 | switch (cmd) { | |
3483 | case BTRFS_BALANCE_CTL_PAUSE: | |
3484 | return btrfs_pause_balance(root->fs_info); | |
a7e99c69 ID |
3485 | case BTRFS_BALANCE_CTL_CANCEL: |
3486 | return btrfs_cancel_balance(root->fs_info); | |
837d5b6e ID |
3487 | } |
3488 | ||
3489 | return -EINVAL; | |
3490 | } | |
3491 | ||
19a39dce ID |
3492 | static long btrfs_ioctl_balance_progress(struct btrfs_root *root, |
3493 | void __user *arg) | |
3494 | { | |
3495 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3496 | struct btrfs_ioctl_balance_args *bargs; | |
3497 | int ret = 0; | |
3498 | ||
3499 | if (!capable(CAP_SYS_ADMIN)) | |
3500 | return -EPERM; | |
3501 | ||
3502 | mutex_lock(&fs_info->balance_mutex); | |
3503 | if (!fs_info->balance_ctl) { | |
3504 | ret = -ENOTCONN; | |
3505 | goto out; | |
3506 | } | |
3507 | ||
3508 | bargs = kzalloc(sizeof(*bargs), GFP_NOFS); | |
3509 | if (!bargs) { | |
3510 | ret = -ENOMEM; | |
3511 | goto out; | |
3512 | } | |
3513 | ||
3514 | update_ioctl_balance_args(fs_info, 1, bargs); | |
3515 | ||
3516 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
3517 | ret = -EFAULT; | |
3518 | ||
3519 | kfree(bargs); | |
3520 | out: | |
3521 | mutex_unlock(&fs_info->balance_mutex); | |
3522 | return ret; | |
3523 | } | |
3524 | ||
5d13a37b AJ |
3525 | static long btrfs_ioctl_quota_ctl(struct btrfs_root *root, void __user *arg) |
3526 | { | |
3527 | struct btrfs_ioctl_quota_ctl_args *sa; | |
3528 | struct btrfs_trans_handle *trans = NULL; | |
3529 | int ret; | |
3530 | int err; | |
3531 | ||
3532 | if (!capable(CAP_SYS_ADMIN)) | |
3533 | return -EPERM; | |
3534 | ||
3535 | if (root->fs_info->sb->s_flags & MS_RDONLY) | |
3536 | return -EROFS; | |
3537 | ||
3538 | sa = memdup_user(arg, sizeof(*sa)); | |
3539 | if (IS_ERR(sa)) | |
3540 | return PTR_ERR(sa); | |
3541 | ||
3542 | if (sa->cmd != BTRFS_QUOTA_CTL_RESCAN) { | |
3543 | trans = btrfs_start_transaction(root, 2); | |
3544 | if (IS_ERR(trans)) { | |
3545 | ret = PTR_ERR(trans); | |
3546 | goto out; | |
3547 | } | |
3548 | } | |
3549 | ||
3550 | switch (sa->cmd) { | |
3551 | case BTRFS_QUOTA_CTL_ENABLE: | |
3552 | ret = btrfs_quota_enable(trans, root->fs_info); | |
3553 | break; | |
3554 | case BTRFS_QUOTA_CTL_DISABLE: | |
3555 | ret = btrfs_quota_disable(trans, root->fs_info); | |
3556 | break; | |
3557 | case BTRFS_QUOTA_CTL_RESCAN: | |
3558 | ret = btrfs_quota_rescan(root->fs_info); | |
3559 | break; | |
3560 | default: | |
3561 | ret = -EINVAL; | |
3562 | break; | |
3563 | } | |
3564 | ||
3565 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
3566 | ret = -EFAULT; | |
3567 | ||
3568 | if (trans) { | |
3569 | err = btrfs_commit_transaction(trans, root); | |
3570 | if (err && !ret) | |
3571 | ret = err; | |
3572 | } | |
3573 | ||
3574 | out: | |
3575 | kfree(sa); | |
3576 | return ret; | |
3577 | } | |
3578 | ||
3579 | static long btrfs_ioctl_qgroup_assign(struct btrfs_root *root, void __user *arg) | |
3580 | { | |
3581 | struct btrfs_ioctl_qgroup_assign_args *sa; | |
3582 | struct btrfs_trans_handle *trans; | |
3583 | int ret; | |
3584 | int err; | |
3585 | ||
3586 | if (!capable(CAP_SYS_ADMIN)) | |
3587 | return -EPERM; | |
3588 | ||
3589 | if (root->fs_info->sb->s_flags & MS_RDONLY) | |
3590 | return -EROFS; | |
3591 | ||
3592 | sa = memdup_user(arg, sizeof(*sa)); | |
3593 | if (IS_ERR(sa)) | |
3594 | return PTR_ERR(sa); | |
3595 | ||
3596 | trans = btrfs_join_transaction(root); | |
3597 | if (IS_ERR(trans)) { | |
3598 | ret = PTR_ERR(trans); | |
3599 | goto out; | |
3600 | } | |
3601 | ||
3602 | /* FIXME: check if the IDs really exist */ | |
3603 | if (sa->assign) { | |
3604 | ret = btrfs_add_qgroup_relation(trans, root->fs_info, | |
3605 | sa->src, sa->dst); | |
3606 | } else { | |
3607 | ret = btrfs_del_qgroup_relation(trans, root->fs_info, | |
3608 | sa->src, sa->dst); | |
3609 | } | |
3610 | ||
3611 | err = btrfs_end_transaction(trans, root); | |
3612 | if (err && !ret) | |
3613 | ret = err; | |
3614 | ||
3615 | out: | |
3616 | kfree(sa); | |
3617 | return ret; | |
3618 | } | |
3619 | ||
3620 | static long btrfs_ioctl_qgroup_create(struct btrfs_root *root, void __user *arg) | |
3621 | { | |
3622 | struct btrfs_ioctl_qgroup_create_args *sa; | |
3623 | struct btrfs_trans_handle *trans; | |
3624 | int ret; | |
3625 | int err; | |
3626 | ||
3627 | if (!capable(CAP_SYS_ADMIN)) | |
3628 | return -EPERM; | |
3629 | ||
3630 | if (root->fs_info->sb->s_flags & MS_RDONLY) | |
3631 | return -EROFS; | |
3632 | ||
3633 | sa = memdup_user(arg, sizeof(*sa)); | |
3634 | if (IS_ERR(sa)) | |
3635 | return PTR_ERR(sa); | |
3636 | ||
3637 | trans = btrfs_join_transaction(root); | |
3638 | if (IS_ERR(trans)) { | |
3639 | ret = PTR_ERR(trans); | |
3640 | goto out; | |
3641 | } | |
3642 | ||
3643 | /* FIXME: check if the IDs really exist */ | |
3644 | if (sa->create) { | |
3645 | ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, | |
3646 | NULL); | |
3647 | } else { | |
3648 | ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); | |
3649 | } | |
3650 | ||
3651 | err = btrfs_end_transaction(trans, root); | |
3652 | if (err && !ret) | |
3653 | ret = err; | |
3654 | ||
3655 | out: | |
3656 | kfree(sa); | |
3657 | return ret; | |
3658 | } | |
3659 | ||
3660 | static long btrfs_ioctl_qgroup_limit(struct btrfs_root *root, void __user *arg) | |
3661 | { | |
3662 | struct btrfs_ioctl_qgroup_limit_args *sa; | |
3663 | struct btrfs_trans_handle *trans; | |
3664 | int ret; | |
3665 | int err; | |
3666 | u64 qgroupid; | |
3667 | ||
3668 | if (!capable(CAP_SYS_ADMIN)) | |
3669 | return -EPERM; | |
3670 | ||
3671 | if (root->fs_info->sb->s_flags & MS_RDONLY) | |
3672 | return -EROFS; | |
3673 | ||
3674 | sa = memdup_user(arg, sizeof(*sa)); | |
3675 | if (IS_ERR(sa)) | |
3676 | return PTR_ERR(sa); | |
3677 | ||
3678 | trans = btrfs_join_transaction(root); | |
3679 | if (IS_ERR(trans)) { | |
3680 | ret = PTR_ERR(trans); | |
3681 | goto out; | |
3682 | } | |
3683 | ||
3684 | qgroupid = sa->qgroupid; | |
3685 | if (!qgroupid) { | |
3686 | /* take the current subvol as qgroup */ | |
3687 | qgroupid = root->root_key.objectid; | |
3688 | } | |
3689 | ||
3690 | /* FIXME: check if the IDs really exist */ | |
3691 | ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); | |
3692 | ||
3693 | err = btrfs_end_transaction(trans, root); | |
3694 | if (err && !ret) | |
3695 | ret = err; | |
3696 | ||
3697 | out: | |
3698 | kfree(sa); | |
3699 | return ret; | |
3700 | } | |
3701 | ||
8ea05e3a AB |
3702 | static long btrfs_ioctl_set_received_subvol(struct file *file, |
3703 | void __user *arg) | |
3704 | { | |
3705 | struct btrfs_ioctl_received_subvol_args *sa = NULL; | |
3706 | struct inode *inode = fdentry(file)->d_inode; | |
3707 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3708 | struct btrfs_root_item *root_item = &root->root_item; | |
3709 | struct btrfs_trans_handle *trans; | |
3710 | struct timespec ct = CURRENT_TIME; | |
3711 | int ret = 0; | |
3712 | ||
3713 | ret = mnt_want_write_file(file); | |
3714 | if (ret < 0) | |
3715 | return ret; | |
3716 | ||
3717 | down_write(&root->fs_info->subvol_sem); | |
3718 | ||
3719 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { | |
3720 | ret = -EINVAL; | |
3721 | goto out; | |
3722 | } | |
3723 | ||
3724 | if (btrfs_root_readonly(root)) { | |
3725 | ret = -EROFS; | |
3726 | goto out; | |
3727 | } | |
3728 | ||
3729 | if (!inode_owner_or_capable(inode)) { | |
3730 | ret = -EACCES; | |
3731 | goto out; | |
3732 | } | |
3733 | ||
3734 | sa = memdup_user(arg, sizeof(*sa)); | |
3735 | if (IS_ERR(sa)) { | |
3736 | ret = PTR_ERR(sa); | |
3737 | sa = NULL; | |
3738 | goto out; | |
3739 | } | |
3740 | ||
3741 | trans = btrfs_start_transaction(root, 1); | |
3742 | if (IS_ERR(trans)) { | |
3743 | ret = PTR_ERR(trans); | |
3744 | trans = NULL; | |
3745 | goto out; | |
3746 | } | |
3747 | ||
3748 | sa->rtransid = trans->transid; | |
3749 | sa->rtime.sec = ct.tv_sec; | |
3750 | sa->rtime.nsec = ct.tv_nsec; | |
3751 | ||
3752 | memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); | |
3753 | btrfs_set_root_stransid(root_item, sa->stransid); | |
3754 | btrfs_set_root_rtransid(root_item, sa->rtransid); | |
3755 | root_item->stime.sec = cpu_to_le64(sa->stime.sec); | |
3756 | root_item->stime.nsec = cpu_to_le32(sa->stime.nsec); | |
3757 | root_item->rtime.sec = cpu_to_le64(sa->rtime.sec); | |
3758 | root_item->rtime.nsec = cpu_to_le32(sa->rtime.nsec); | |
3759 | ||
3760 | ret = btrfs_update_root(trans, root->fs_info->tree_root, | |
3761 | &root->root_key, &root->root_item); | |
3762 | if (ret < 0) { | |
3763 | btrfs_end_transaction(trans, root); | |
3764 | trans = NULL; | |
3765 | goto out; | |
3766 | } else { | |
3767 | ret = btrfs_commit_transaction(trans, root); | |
3768 | if (ret < 0) | |
3769 | goto out; | |
3770 | } | |
3771 | ||
3772 | ret = copy_to_user(arg, sa, sizeof(*sa)); | |
3773 | if (ret) | |
3774 | ret = -EFAULT; | |
3775 | ||
3776 | out: | |
3777 | kfree(sa); | |
3778 | up_write(&root->fs_info->subvol_sem); | |
3779 | mnt_drop_write_file(file); | |
3780 | return ret; | |
3781 | } | |
3782 | ||
f46b5a66 CH |
3783 | long btrfs_ioctl(struct file *file, unsigned int |
3784 | cmd, unsigned long arg) | |
3785 | { | |
3786 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; | |
4bcabaa3 | 3787 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
3788 | |
3789 | switch (cmd) { | |
6cbff00f CH |
3790 | case FS_IOC_GETFLAGS: |
3791 | return btrfs_ioctl_getflags(file, argp); | |
3792 | case FS_IOC_SETFLAGS: | |
3793 | return btrfs_ioctl_setflags(file, argp); | |
3794 | case FS_IOC_GETVERSION: | |
3795 | return btrfs_ioctl_getversion(file, argp); | |
f7039b1d LD |
3796 | case FITRIM: |
3797 | return btrfs_ioctl_fitrim(file, argp); | |
f46b5a66 | 3798 | case BTRFS_IOC_SNAP_CREATE: |
fa0d2b9b | 3799 | return btrfs_ioctl_snap_create(file, argp, 0); |
fdfb1e4f | 3800 | case BTRFS_IOC_SNAP_CREATE_V2: |
fa0d2b9b | 3801 | return btrfs_ioctl_snap_create_v2(file, argp, 0); |
3de4586c | 3802 | case BTRFS_IOC_SUBVOL_CREATE: |
fa0d2b9b | 3803 | return btrfs_ioctl_snap_create(file, argp, 1); |
6f72c7e2 AJ |
3804 | case BTRFS_IOC_SUBVOL_CREATE_V2: |
3805 | return btrfs_ioctl_snap_create_v2(file, argp, 1); | |
76dda93c YZ |
3806 | case BTRFS_IOC_SNAP_DESTROY: |
3807 | return btrfs_ioctl_snap_destroy(file, argp); | |
0caa102d LZ |
3808 | case BTRFS_IOC_SUBVOL_GETFLAGS: |
3809 | return btrfs_ioctl_subvol_getflags(file, argp); | |
3810 | case BTRFS_IOC_SUBVOL_SETFLAGS: | |
3811 | return btrfs_ioctl_subvol_setflags(file, argp); | |
6ef5ed0d JB |
3812 | case BTRFS_IOC_DEFAULT_SUBVOL: |
3813 | return btrfs_ioctl_default_subvol(file, argp); | |
f46b5a66 | 3814 | case BTRFS_IOC_DEFRAG: |
1e701a32 CM |
3815 | return btrfs_ioctl_defrag(file, NULL); |
3816 | case BTRFS_IOC_DEFRAG_RANGE: | |
3817 | return btrfs_ioctl_defrag(file, argp); | |
f46b5a66 | 3818 | case BTRFS_IOC_RESIZE: |
4bcabaa3 | 3819 | return btrfs_ioctl_resize(root, argp); |
f46b5a66 | 3820 | case BTRFS_IOC_ADD_DEV: |
4bcabaa3 | 3821 | return btrfs_ioctl_add_dev(root, argp); |
f46b5a66 | 3822 | case BTRFS_IOC_RM_DEV: |
4bcabaa3 | 3823 | return btrfs_ioctl_rm_dev(root, argp); |
475f6387 JS |
3824 | case BTRFS_IOC_FS_INFO: |
3825 | return btrfs_ioctl_fs_info(root, argp); | |
3826 | case BTRFS_IOC_DEV_INFO: | |
3827 | return btrfs_ioctl_dev_info(root, argp); | |
f46b5a66 | 3828 | case BTRFS_IOC_BALANCE: |
9ba1f6e4 | 3829 | return btrfs_ioctl_balance(file, NULL); |
f46b5a66 | 3830 | case BTRFS_IOC_CLONE: |
c5c9cd4d SW |
3831 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
3832 | case BTRFS_IOC_CLONE_RANGE: | |
7a865e8a | 3833 | return btrfs_ioctl_clone_range(file, argp); |
f46b5a66 CH |
3834 | case BTRFS_IOC_TRANS_START: |
3835 | return btrfs_ioctl_trans_start(file); | |
3836 | case BTRFS_IOC_TRANS_END: | |
3837 | return btrfs_ioctl_trans_end(file); | |
ac8e9819 CM |
3838 | case BTRFS_IOC_TREE_SEARCH: |
3839 | return btrfs_ioctl_tree_search(file, argp); | |
3840 | case BTRFS_IOC_INO_LOOKUP: | |
3841 | return btrfs_ioctl_ino_lookup(file, argp); | |
d7728c96 JS |
3842 | case BTRFS_IOC_INO_PATHS: |
3843 | return btrfs_ioctl_ino_to_path(root, argp); | |
3844 | case BTRFS_IOC_LOGICAL_INO: | |
3845 | return btrfs_ioctl_logical_to_ino(root, argp); | |
1406e432 JB |
3846 | case BTRFS_IOC_SPACE_INFO: |
3847 | return btrfs_ioctl_space_info(root, argp); | |
f46b5a66 CH |
3848 | case BTRFS_IOC_SYNC: |
3849 | btrfs_sync_fs(file->f_dentry->d_sb, 1); | |
3850 | return 0; | |
46204592 | 3851 | case BTRFS_IOC_START_SYNC: |
9a8c28be | 3852 | return btrfs_ioctl_start_sync(root, argp); |
46204592 | 3853 | case BTRFS_IOC_WAIT_SYNC: |
9a8c28be | 3854 | return btrfs_ioctl_wait_sync(root, argp); |
475f6387 JS |
3855 | case BTRFS_IOC_SCRUB: |
3856 | return btrfs_ioctl_scrub(root, argp); | |
3857 | case BTRFS_IOC_SCRUB_CANCEL: | |
3858 | return btrfs_ioctl_scrub_cancel(root, argp); | |
3859 | case BTRFS_IOC_SCRUB_PROGRESS: | |
3860 | return btrfs_ioctl_scrub_progress(root, argp); | |
c9e9f97b | 3861 | case BTRFS_IOC_BALANCE_V2: |
9ba1f6e4 | 3862 | return btrfs_ioctl_balance(file, argp); |
837d5b6e ID |
3863 | case BTRFS_IOC_BALANCE_CTL: |
3864 | return btrfs_ioctl_balance_ctl(root, arg); | |
19a39dce ID |
3865 | case BTRFS_IOC_BALANCE_PROGRESS: |
3866 | return btrfs_ioctl_balance_progress(root, argp); | |
8ea05e3a AB |
3867 | case BTRFS_IOC_SET_RECEIVED_SUBVOL: |
3868 | return btrfs_ioctl_set_received_subvol(file, argp); | |
31db9f7c AB |
3869 | case BTRFS_IOC_SEND: |
3870 | return btrfs_ioctl_send(file, argp); | |
c11d2c23 | 3871 | case BTRFS_IOC_GET_DEV_STATS: |
b27f7c0c | 3872 | return btrfs_ioctl_get_dev_stats(root, argp); |
5d13a37b AJ |
3873 | case BTRFS_IOC_QUOTA_CTL: |
3874 | return btrfs_ioctl_quota_ctl(root, argp); | |
3875 | case BTRFS_IOC_QGROUP_ASSIGN: | |
3876 | return btrfs_ioctl_qgroup_assign(root, argp); | |
3877 | case BTRFS_IOC_QGROUP_CREATE: | |
3878 | return btrfs_ioctl_qgroup_create(root, argp); | |
3879 | case BTRFS_IOC_QGROUP_LIMIT: | |
3880 | return btrfs_ioctl_qgroup_limit(root, argp); | |
3f6bcfbd SB |
3881 | case BTRFS_IOC_DEV_REPLACE: |
3882 | return btrfs_ioctl_dev_replace(root, argp); | |
f46b5a66 CH |
3883 | } |
3884 | ||
3885 | return -ENOTTY; | |
3886 | } |