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> |
4b4e25f2 | 44 | #include "compat.h" |
f46b5a66 CH |
45 | #include "ctree.h" |
46 | #include "disk-io.h" | |
47 | #include "transaction.h" | |
48 | #include "btrfs_inode.h" | |
49 | #include "ioctl.h" | |
50 | #include "print-tree.h" | |
51 | #include "volumes.h" | |
925baedd | 52 | #include "locking.h" |
f46b5a66 | 53 | |
6cbff00f CH |
54 | /* Mask out flags that are inappropriate for the given type of inode. */ |
55 | static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) | |
56 | { | |
57 | if (S_ISDIR(mode)) | |
58 | return flags; | |
59 | else if (S_ISREG(mode)) | |
60 | return flags & ~FS_DIRSYNC_FL; | |
61 | else | |
62 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); | |
63 | } | |
64 | ||
65 | /* | |
66 | * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. | |
67 | */ | |
68 | static unsigned int btrfs_flags_to_ioctl(unsigned int flags) | |
69 | { | |
70 | unsigned int iflags = 0; | |
71 | ||
72 | if (flags & BTRFS_INODE_SYNC) | |
73 | iflags |= FS_SYNC_FL; | |
74 | if (flags & BTRFS_INODE_IMMUTABLE) | |
75 | iflags |= FS_IMMUTABLE_FL; | |
76 | if (flags & BTRFS_INODE_APPEND) | |
77 | iflags |= FS_APPEND_FL; | |
78 | if (flags & BTRFS_INODE_NODUMP) | |
79 | iflags |= FS_NODUMP_FL; | |
80 | if (flags & BTRFS_INODE_NOATIME) | |
81 | iflags |= FS_NOATIME_FL; | |
82 | if (flags & BTRFS_INODE_DIRSYNC) | |
83 | iflags |= FS_DIRSYNC_FL; | |
84 | ||
85 | return iflags; | |
86 | } | |
87 | ||
88 | /* | |
89 | * Update inode->i_flags based on the btrfs internal flags. | |
90 | */ | |
91 | void btrfs_update_iflags(struct inode *inode) | |
92 | { | |
93 | struct btrfs_inode *ip = BTRFS_I(inode); | |
94 | ||
95 | inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
96 | ||
97 | if (ip->flags & BTRFS_INODE_SYNC) | |
98 | inode->i_flags |= S_SYNC; | |
99 | if (ip->flags & BTRFS_INODE_IMMUTABLE) | |
100 | inode->i_flags |= S_IMMUTABLE; | |
101 | if (ip->flags & BTRFS_INODE_APPEND) | |
102 | inode->i_flags |= S_APPEND; | |
103 | if (ip->flags & BTRFS_INODE_NOATIME) | |
104 | inode->i_flags |= S_NOATIME; | |
105 | if (ip->flags & BTRFS_INODE_DIRSYNC) | |
106 | inode->i_flags |= S_DIRSYNC; | |
107 | } | |
108 | ||
109 | /* | |
110 | * Inherit flags from the parent inode. | |
111 | * | |
112 | * Unlike extN we don't have any flags we don't want to inherit currently. | |
113 | */ | |
114 | void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) | |
115 | { | |
0b4dcea5 CM |
116 | unsigned int flags; |
117 | ||
118 | if (!dir) | |
119 | return; | |
120 | ||
121 | flags = BTRFS_I(dir)->flags; | |
6cbff00f CH |
122 | |
123 | if (S_ISREG(inode->i_mode)) | |
124 | flags &= ~BTRFS_INODE_DIRSYNC; | |
125 | else if (!S_ISDIR(inode->i_mode)) | |
126 | flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME); | |
127 | ||
128 | BTRFS_I(inode)->flags = flags; | |
129 | btrfs_update_iflags(inode); | |
130 | } | |
131 | ||
132 | static int btrfs_ioctl_getflags(struct file *file, void __user *arg) | |
133 | { | |
134 | struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); | |
135 | unsigned int flags = btrfs_flags_to_ioctl(ip->flags); | |
136 | ||
137 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
138 | return -EFAULT; | |
139 | return 0; | |
140 | } | |
141 | ||
75e7cb7f LB |
142 | static int check_flags(unsigned int flags) |
143 | { | |
144 | if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ | |
145 | FS_NOATIME_FL | FS_NODUMP_FL | \ | |
146 | FS_SYNC_FL | FS_DIRSYNC_FL | \ | |
147 | FS_NOCOMP_FL | FS_COMPR_FL | \ | |
148 | FS_NOCOW_FL | FS_COW_FL)) | |
149 | return -EOPNOTSUPP; | |
150 | ||
151 | if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) | |
152 | return -EINVAL; | |
153 | ||
154 | if ((flags & FS_NOCOW_FL) && (flags & FS_COW_FL)) | |
155 | return -EINVAL; | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
6cbff00f CH |
160 | static int btrfs_ioctl_setflags(struct file *file, void __user *arg) |
161 | { | |
162 | struct inode *inode = file->f_path.dentry->d_inode; | |
163 | struct btrfs_inode *ip = BTRFS_I(inode); | |
164 | struct btrfs_root *root = ip->root; | |
165 | struct btrfs_trans_handle *trans; | |
166 | unsigned int flags, oldflags; | |
167 | int ret; | |
168 | ||
b83cc969 LZ |
169 | if (btrfs_root_readonly(root)) |
170 | return -EROFS; | |
171 | ||
6cbff00f CH |
172 | if (copy_from_user(&flags, arg, sizeof(flags))) |
173 | return -EFAULT; | |
174 | ||
75e7cb7f LB |
175 | ret = check_flags(flags); |
176 | if (ret) | |
177 | return ret; | |
f46b5a66 | 178 | |
6cbff00f CH |
179 | if (!is_owner_or_cap(inode)) |
180 | return -EACCES; | |
181 | ||
182 | mutex_lock(&inode->i_mutex); | |
183 | ||
184 | flags = btrfs_mask_flags(inode->i_mode, flags); | |
185 | oldflags = btrfs_flags_to_ioctl(ip->flags); | |
186 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { | |
187 | if (!capable(CAP_LINUX_IMMUTABLE)) { | |
188 | ret = -EPERM; | |
189 | goto out_unlock; | |
190 | } | |
191 | } | |
192 | ||
193 | ret = mnt_want_write(file->f_path.mnt); | |
194 | if (ret) | |
195 | goto out_unlock; | |
196 | ||
197 | if (flags & FS_SYNC_FL) | |
198 | ip->flags |= BTRFS_INODE_SYNC; | |
199 | else | |
200 | ip->flags &= ~BTRFS_INODE_SYNC; | |
201 | if (flags & FS_IMMUTABLE_FL) | |
202 | ip->flags |= BTRFS_INODE_IMMUTABLE; | |
203 | else | |
204 | ip->flags &= ~BTRFS_INODE_IMMUTABLE; | |
205 | if (flags & FS_APPEND_FL) | |
206 | ip->flags |= BTRFS_INODE_APPEND; | |
207 | else | |
208 | ip->flags &= ~BTRFS_INODE_APPEND; | |
209 | if (flags & FS_NODUMP_FL) | |
210 | ip->flags |= BTRFS_INODE_NODUMP; | |
211 | else | |
212 | ip->flags &= ~BTRFS_INODE_NODUMP; | |
213 | if (flags & FS_NOATIME_FL) | |
214 | ip->flags |= BTRFS_INODE_NOATIME; | |
215 | else | |
216 | ip->flags &= ~BTRFS_INODE_NOATIME; | |
217 | if (flags & FS_DIRSYNC_FL) | |
218 | ip->flags |= BTRFS_INODE_DIRSYNC; | |
219 | else | |
220 | ip->flags &= ~BTRFS_INODE_DIRSYNC; | |
221 | ||
75e7cb7f LB |
222 | /* |
223 | * The COMPRESS flag can only be changed by users, while the NOCOMPRESS | |
224 | * flag may be changed automatically if compression code won't make | |
225 | * things smaller. | |
226 | */ | |
227 | if (flags & FS_NOCOMP_FL) { | |
228 | ip->flags &= ~BTRFS_INODE_COMPRESS; | |
229 | ip->flags |= BTRFS_INODE_NOCOMPRESS; | |
230 | } else if (flags & FS_COMPR_FL) { | |
231 | ip->flags |= BTRFS_INODE_COMPRESS; | |
232 | ip->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
233 | } | |
234 | if (flags & FS_NOCOW_FL) | |
235 | ip->flags |= BTRFS_INODE_NODATACOW; | |
236 | else if (flags & FS_COW_FL) | |
237 | ip->flags &= ~BTRFS_INODE_NODATACOW; | |
6cbff00f CH |
238 | |
239 | trans = btrfs_join_transaction(root, 1); | |
3612b495 | 240 | BUG_ON(IS_ERR(trans)); |
6cbff00f CH |
241 | |
242 | ret = btrfs_update_inode(trans, root, inode); | |
243 | BUG_ON(ret); | |
244 | ||
245 | btrfs_update_iflags(inode); | |
246 | inode->i_ctime = CURRENT_TIME; | |
247 | btrfs_end_transaction(trans, root); | |
248 | ||
249 | mnt_drop_write(file->f_path.mnt); | |
250 | out_unlock: | |
251 | mutex_unlock(&inode->i_mutex); | |
252 | return 0; | |
253 | } | |
254 | ||
255 | static int btrfs_ioctl_getversion(struct file *file, int __user *arg) | |
256 | { | |
257 | struct inode *inode = file->f_path.dentry->d_inode; | |
258 | ||
259 | return put_user(inode->i_generation, arg); | |
260 | } | |
f46b5a66 | 261 | |
f7039b1d LD |
262 | static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) |
263 | { | |
264 | struct btrfs_root *root = fdentry(file)->d_sb->s_fs_info; | |
265 | struct btrfs_fs_info *fs_info = root->fs_info; | |
266 | struct btrfs_device *device; | |
267 | struct request_queue *q; | |
268 | struct fstrim_range range; | |
269 | u64 minlen = ULLONG_MAX; | |
270 | u64 num_devices = 0; | |
271 | int ret; | |
272 | ||
273 | if (!capable(CAP_SYS_ADMIN)) | |
274 | return -EPERM; | |
275 | ||
276 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
277 | list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) { | |
278 | if (!device->bdev) | |
279 | continue; | |
280 | q = bdev_get_queue(device->bdev); | |
281 | if (blk_queue_discard(q)) { | |
282 | num_devices++; | |
283 | minlen = min((u64)q->limits.discard_granularity, | |
284 | minlen); | |
285 | } | |
286 | } | |
287 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
288 | if (!num_devices) | |
289 | return -EOPNOTSUPP; | |
290 | ||
291 | if (copy_from_user(&range, arg, sizeof(range))) | |
292 | return -EFAULT; | |
293 | ||
294 | range.minlen = max(range.minlen, minlen); | |
295 | ret = btrfs_trim_fs(root, &range); | |
296 | if (ret < 0) | |
297 | return ret; | |
298 | ||
299 | if (copy_to_user(arg, &range, sizeof(range))) | |
300 | return -EFAULT; | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
cb8e7090 CH |
305 | static noinline int create_subvol(struct btrfs_root *root, |
306 | struct dentry *dentry, | |
72fd032e SW |
307 | char *name, int namelen, |
308 | u64 *async_transid) | |
f46b5a66 CH |
309 | { |
310 | struct btrfs_trans_handle *trans; | |
311 | struct btrfs_key key; | |
312 | struct btrfs_root_item root_item; | |
313 | struct btrfs_inode_item *inode_item; | |
314 | struct extent_buffer *leaf; | |
76dda93c | 315 | struct btrfs_root *new_root; |
6a912213 JB |
316 | struct dentry *parent = dget_parent(dentry); |
317 | struct inode *dir; | |
f46b5a66 CH |
318 | int ret; |
319 | int err; | |
320 | u64 objectid; | |
321 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
3de4586c | 322 | u64 index = 0; |
f46b5a66 | 323 | |
a22285a6 YZ |
324 | ret = btrfs_find_free_objectid(NULL, root->fs_info->tree_root, |
325 | 0, &objectid); | |
6a912213 JB |
326 | if (ret) { |
327 | dput(parent); | |
a22285a6 | 328 | return ret; |
6a912213 JB |
329 | } |
330 | ||
331 | dir = parent->d_inode; | |
332 | ||
9ed74f2d JB |
333 | /* |
334 | * 1 - inode item | |
335 | * 2 - refs | |
336 | * 1 - root item | |
337 | * 2 - dir items | |
338 | */ | |
a22285a6 | 339 | trans = btrfs_start_transaction(root, 6); |
6a912213 JB |
340 | if (IS_ERR(trans)) { |
341 | dput(parent); | |
a22285a6 | 342 | return PTR_ERR(trans); |
6a912213 | 343 | } |
f46b5a66 | 344 | |
5d4f98a2 YZ |
345 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, |
346 | 0, objectid, NULL, 0, 0, 0); | |
8e8a1e31 JB |
347 | if (IS_ERR(leaf)) { |
348 | ret = PTR_ERR(leaf); | |
349 | goto fail; | |
350 | } | |
f46b5a66 | 351 | |
5d4f98a2 | 352 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
f46b5a66 CH |
353 | btrfs_set_header_bytenr(leaf, leaf->start); |
354 | btrfs_set_header_generation(leaf, trans->transid); | |
5d4f98a2 | 355 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); |
f46b5a66 CH |
356 | btrfs_set_header_owner(leaf, objectid); |
357 | ||
358 | write_extent_buffer(leaf, root->fs_info->fsid, | |
359 | (unsigned long)btrfs_header_fsid(leaf), | |
360 | BTRFS_FSID_SIZE); | |
5d4f98a2 YZ |
361 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, |
362 | (unsigned long)btrfs_header_chunk_tree_uuid(leaf), | |
363 | BTRFS_UUID_SIZE); | |
f46b5a66 CH |
364 | btrfs_mark_buffer_dirty(leaf); |
365 | ||
366 | inode_item = &root_item.inode; | |
367 | memset(inode_item, 0, sizeof(*inode_item)); | |
368 | inode_item->generation = cpu_to_le64(1); | |
369 | inode_item->size = cpu_to_le64(3); | |
370 | inode_item->nlink = cpu_to_le32(1); | |
a76a3cd4 | 371 | inode_item->nbytes = cpu_to_le64(root->leafsize); |
f46b5a66 CH |
372 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); |
373 | ||
374 | btrfs_set_root_bytenr(&root_item, leaf->start); | |
84234f3a | 375 | btrfs_set_root_generation(&root_item, trans->transid); |
f46b5a66 CH |
376 | btrfs_set_root_level(&root_item, 0); |
377 | btrfs_set_root_refs(&root_item, 1); | |
86b9f2ec | 378 | btrfs_set_root_used(&root_item, leaf->len); |
80ff3856 | 379 | btrfs_set_root_last_snapshot(&root_item, 0); |
f46b5a66 CH |
380 | |
381 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); | |
382 | root_item.drop_level = 0; | |
383 | ||
925baedd | 384 | btrfs_tree_unlock(leaf); |
f46b5a66 CH |
385 | free_extent_buffer(leaf); |
386 | leaf = NULL; | |
387 | ||
388 | btrfs_set_root_dirid(&root_item, new_dirid); | |
389 | ||
390 | key.objectid = objectid; | |
5d4f98a2 | 391 | key.offset = 0; |
f46b5a66 CH |
392 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
393 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
394 | &root_item); | |
395 | if (ret) | |
396 | goto fail; | |
397 | ||
76dda93c YZ |
398 | key.offset = (u64)-1; |
399 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); | |
400 | BUG_ON(IS_ERR(new_root)); | |
401 | ||
402 | btrfs_record_root_in_trans(trans, new_root); | |
403 | ||
404 | ret = btrfs_create_subvol_root(trans, new_root, new_dirid, | |
405 | BTRFS_I(dir)->block_group); | |
f46b5a66 CH |
406 | /* |
407 | * insert the directory item | |
408 | */ | |
3de4586c CM |
409 | ret = btrfs_set_inode_index(dir, &index); |
410 | BUG_ON(ret); | |
411 | ||
412 | ret = btrfs_insert_dir_item(trans, root, | |
f46b5a66 | 413 | name, namelen, dir->i_ino, &key, |
3de4586c | 414 | BTRFS_FT_DIR, index); |
f46b5a66 CH |
415 | if (ret) |
416 | goto fail; | |
0660b5af | 417 | |
52c26179 YZ |
418 | btrfs_i_size_write(dir, dir->i_size + namelen * 2); |
419 | ret = btrfs_update_inode(trans, root, dir); | |
420 | BUG_ON(ret); | |
421 | ||
0660b5af | 422 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
4df27c4d | 423 | objectid, root->root_key.objectid, |
0660b5af | 424 | dir->i_ino, index, name, namelen); |
0660b5af | 425 | |
76dda93c | 426 | BUG_ON(ret); |
f46b5a66 | 427 | |
76dda93c | 428 | d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); |
f46b5a66 | 429 | fail: |
6a912213 | 430 | dput(parent); |
72fd032e SW |
431 | if (async_transid) { |
432 | *async_transid = trans->transid; | |
433 | err = btrfs_commit_transaction_async(trans, root, 1); | |
434 | } else { | |
435 | err = btrfs_commit_transaction(trans, root); | |
436 | } | |
f46b5a66 CH |
437 | if (err && !ret) |
438 | ret = err; | |
f46b5a66 CH |
439 | return ret; |
440 | } | |
441 | ||
72fd032e | 442 | static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, |
b83cc969 LZ |
443 | char *name, int namelen, u64 *async_transid, |
444 | bool readonly) | |
f46b5a66 | 445 | { |
2e4bfab9 | 446 | struct inode *inode; |
6a912213 | 447 | struct dentry *parent; |
f46b5a66 CH |
448 | struct btrfs_pending_snapshot *pending_snapshot; |
449 | struct btrfs_trans_handle *trans; | |
2e4bfab9 | 450 | int ret; |
f46b5a66 CH |
451 | |
452 | if (!root->ref_cows) | |
453 | return -EINVAL; | |
454 | ||
3de4586c | 455 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
a22285a6 YZ |
456 | if (!pending_snapshot) |
457 | return -ENOMEM; | |
458 | ||
459 | btrfs_init_block_rsv(&pending_snapshot->block_rsv); | |
3de4586c | 460 | pending_snapshot->dentry = dentry; |
f46b5a66 | 461 | pending_snapshot->root = root; |
b83cc969 | 462 | pending_snapshot->readonly = readonly; |
a22285a6 YZ |
463 | |
464 | trans = btrfs_start_transaction(root->fs_info->extent_root, 5); | |
465 | if (IS_ERR(trans)) { | |
466 | ret = PTR_ERR(trans); | |
467 | goto fail; | |
468 | } | |
469 | ||
470 | ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); | |
471 | BUG_ON(ret); | |
472 | ||
f46b5a66 CH |
473 | list_add(&pending_snapshot->list, |
474 | &trans->transaction->pending_snapshots); | |
72fd032e SW |
475 | if (async_transid) { |
476 | *async_transid = trans->transid; | |
477 | ret = btrfs_commit_transaction_async(trans, | |
478 | root->fs_info->extent_root, 1); | |
479 | } else { | |
480 | ret = btrfs_commit_transaction(trans, | |
481 | root->fs_info->extent_root); | |
482 | } | |
2e4bfab9 | 483 | BUG_ON(ret); |
a22285a6 YZ |
484 | |
485 | ret = pending_snapshot->error; | |
486 | if (ret) | |
487 | goto fail; | |
488 | ||
66b4ffd1 JB |
489 | ret = btrfs_orphan_cleanup(pending_snapshot->snap); |
490 | if (ret) | |
491 | goto fail; | |
f46b5a66 | 492 | |
6a912213 JB |
493 | parent = dget_parent(dentry); |
494 | inode = btrfs_lookup_dentry(parent->d_inode, dentry); | |
495 | dput(parent); | |
2e4bfab9 YZ |
496 | if (IS_ERR(inode)) { |
497 | ret = PTR_ERR(inode); | |
498 | goto fail; | |
499 | } | |
500 | BUG_ON(!inode); | |
501 | d_instantiate(dentry, inode); | |
502 | ret = 0; | |
503 | fail: | |
a22285a6 | 504 | kfree(pending_snapshot); |
f46b5a66 CH |
505 | return ret; |
506 | } | |
507 | ||
4260f7c7 SW |
508 | /* copy of check_sticky in fs/namei.c() |
509 | * It's inline, so penalty for filesystems that don't use sticky bit is | |
510 | * minimal. | |
511 | */ | |
512 | static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) | |
513 | { | |
514 | uid_t fsuid = current_fsuid(); | |
515 | ||
516 | if (!(dir->i_mode & S_ISVTX)) | |
517 | return 0; | |
518 | if (inode->i_uid == fsuid) | |
519 | return 0; | |
520 | if (dir->i_uid == fsuid) | |
521 | return 0; | |
522 | return !capable(CAP_FOWNER); | |
523 | } | |
524 | ||
525 | /* copy of may_delete in fs/namei.c() | |
526 | * Check whether we can remove a link victim from directory dir, check | |
527 | * whether the type of victim is right. | |
528 | * 1. We can't do it if dir is read-only (done in permission()) | |
529 | * 2. We should have write and exec permissions on dir | |
530 | * 3. We can't remove anything from append-only dir | |
531 | * 4. We can't do anything with immutable dir (done in permission()) | |
532 | * 5. If the sticky bit on dir is set we should either | |
533 | * a. be owner of dir, or | |
534 | * b. be owner of victim, or | |
535 | * c. have CAP_FOWNER capability | |
536 | * 6. If the victim is append-only or immutable we can't do antyhing with | |
537 | * links pointing to it. | |
538 | * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. | |
539 | * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. | |
540 | * 9. We can't remove a root or mountpoint. | |
541 | * 10. We don't allow removal of NFS sillyrenamed files; it's handled by | |
542 | * nfs_async_unlink(). | |
543 | */ | |
544 | ||
545 | static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) | |
546 | { | |
547 | int error; | |
548 | ||
549 | if (!victim->d_inode) | |
550 | return -ENOENT; | |
551 | ||
552 | BUG_ON(victim->d_parent->d_inode != dir); | |
553 | audit_inode_child(victim, dir); | |
554 | ||
555 | error = inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
556 | if (error) | |
557 | return error; | |
558 | if (IS_APPEND(dir)) | |
559 | return -EPERM; | |
560 | if (btrfs_check_sticky(dir, victim->d_inode)|| | |
561 | IS_APPEND(victim->d_inode)|| | |
562 | IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) | |
563 | return -EPERM; | |
564 | if (isdir) { | |
565 | if (!S_ISDIR(victim->d_inode->i_mode)) | |
566 | return -ENOTDIR; | |
567 | if (IS_ROOT(victim)) | |
568 | return -EBUSY; | |
569 | } else if (S_ISDIR(victim->d_inode->i_mode)) | |
570 | return -EISDIR; | |
571 | if (IS_DEADDIR(dir)) | |
572 | return -ENOENT; | |
573 | if (victim->d_flags & DCACHE_NFSFS_RENAMED) | |
574 | return -EBUSY; | |
575 | return 0; | |
576 | } | |
577 | ||
cb8e7090 CH |
578 | /* copy of may_create in fs/namei.c() */ |
579 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
580 | { | |
581 | if (child->d_inode) | |
582 | return -EEXIST; | |
583 | if (IS_DEADDIR(dir)) | |
584 | return -ENOENT; | |
585 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
586 | } | |
587 | ||
588 | /* | |
589 | * Create a new subvolume below @parent. This is largely modeled after | |
590 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
591 | * inside this filesystem so it's quite a bit simpler. | |
592 | */ | |
76dda93c YZ |
593 | static noinline int btrfs_mksubvol(struct path *parent, |
594 | char *name, int namelen, | |
72fd032e | 595 | struct btrfs_root *snap_src, |
b83cc969 | 596 | u64 *async_transid, bool readonly) |
cb8e7090 | 597 | { |
76dda93c | 598 | struct inode *dir = parent->dentry->d_inode; |
cb8e7090 CH |
599 | struct dentry *dentry; |
600 | int error; | |
601 | ||
76dda93c | 602 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
cb8e7090 CH |
603 | |
604 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
605 | error = PTR_ERR(dentry); | |
606 | if (IS_ERR(dentry)) | |
607 | goto out_unlock; | |
608 | ||
609 | error = -EEXIST; | |
610 | if (dentry->d_inode) | |
611 | goto out_dput; | |
612 | ||
cb8e7090 CH |
613 | error = mnt_want_write(parent->mnt); |
614 | if (error) | |
615 | goto out_dput; | |
616 | ||
76dda93c | 617 | error = btrfs_may_create(dir, dentry); |
cb8e7090 CH |
618 | if (error) |
619 | goto out_drop_write; | |
620 | ||
76dda93c YZ |
621 | down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); |
622 | ||
623 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) | |
624 | goto out_up_read; | |
625 | ||
3de4586c | 626 | if (snap_src) { |
72fd032e | 627 | error = create_snapshot(snap_src, dentry, |
b83cc969 | 628 | name, namelen, async_transid, readonly); |
3de4586c | 629 | } else { |
76dda93c | 630 | error = create_subvol(BTRFS_I(dir)->root, dentry, |
72fd032e | 631 | name, namelen, async_transid); |
3de4586c | 632 | } |
76dda93c YZ |
633 | if (!error) |
634 | fsnotify_mkdir(dir, dentry); | |
635 | out_up_read: | |
636 | up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); | |
cb8e7090 CH |
637 | out_drop_write: |
638 | mnt_drop_write(parent->mnt); | |
639 | out_dput: | |
640 | dput(dentry); | |
641 | out_unlock: | |
76dda93c | 642 | mutex_unlock(&dir->i_mutex); |
cb8e7090 CH |
643 | return error; |
644 | } | |
645 | ||
940100a4 | 646 | static int should_defrag_range(struct inode *inode, u64 start, u64 len, |
1e701a32 CM |
647 | int thresh, u64 *last_len, u64 *skip, |
648 | u64 *defrag_end) | |
940100a4 CM |
649 | { |
650 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
651 | struct extent_map *em = NULL; | |
652 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
653 | int ret = 1; | |
654 | ||
1e701a32 CM |
655 | |
656 | if (thresh == 0) | |
657 | thresh = 256 * 1024; | |
658 | ||
940100a4 CM |
659 | /* |
660 | * make sure that once we start defragging and extent, we keep on | |
661 | * defragging it | |
662 | */ | |
663 | if (start < *defrag_end) | |
664 | return 1; | |
665 | ||
666 | *skip = 0; | |
667 | ||
668 | /* | |
669 | * hopefully we have this extent in the tree already, try without | |
670 | * the full extent lock | |
671 | */ | |
672 | read_lock(&em_tree->lock); | |
673 | em = lookup_extent_mapping(em_tree, start, len); | |
674 | read_unlock(&em_tree->lock); | |
675 | ||
676 | if (!em) { | |
677 | /* get the big lock and read metadata off disk */ | |
678 | lock_extent(io_tree, start, start + len - 1, GFP_NOFS); | |
679 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); | |
680 | unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); | |
681 | ||
6cf8bfbf | 682 | if (IS_ERR(em)) |
940100a4 CM |
683 | return 0; |
684 | } | |
685 | ||
686 | /* this will cover holes, and inline extents */ | |
687 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) | |
688 | ret = 0; | |
689 | ||
690 | /* | |
691 | * we hit a real extent, if it is big don't bother defragging it again | |
692 | */ | |
1e701a32 | 693 | if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) |
940100a4 CM |
694 | ret = 0; |
695 | ||
696 | /* | |
697 | * last_len ends up being a counter of how many bytes we've defragged. | |
698 | * every time we choose not to defrag an extent, we reset *last_len | |
699 | * so that the next tiny extent will force a defrag. | |
700 | * | |
701 | * The end result of this is that tiny extents before a single big | |
702 | * extent will force at least part of that big extent to be defragged. | |
703 | */ | |
704 | if (ret) { | |
705 | *last_len += len; | |
706 | *defrag_end = extent_map_end(em); | |
707 | } else { | |
708 | *last_len = 0; | |
709 | *skip = extent_map_end(em); | |
710 | *defrag_end = 0; | |
711 | } | |
712 | ||
713 | free_extent_map(em); | |
714 | return ret; | |
715 | } | |
716 | ||
1e701a32 CM |
717 | static int btrfs_defrag_file(struct file *file, |
718 | struct btrfs_ioctl_defrag_range_args *range) | |
f46b5a66 CH |
719 | { |
720 | struct inode *inode = fdentry(file)->d_inode; | |
721 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
722 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
3eaa2885 | 723 | struct btrfs_ordered_extent *ordered; |
f46b5a66 | 724 | struct page *page; |
1a419d85 | 725 | struct btrfs_super_block *disk_super; |
f46b5a66 CH |
726 | unsigned long last_index; |
727 | unsigned long ra_pages = root->fs_info->bdi.ra_pages; | |
728 | unsigned long total_read = 0; | |
1a419d85 | 729 | u64 features; |
f46b5a66 CH |
730 | u64 page_start; |
731 | u64 page_end; | |
940100a4 CM |
732 | u64 last_len = 0; |
733 | u64 skip = 0; | |
734 | u64 defrag_end = 0; | |
f46b5a66 CH |
735 | unsigned long i; |
736 | int ret; | |
1a419d85 LZ |
737 | int compress_type = BTRFS_COMPRESS_ZLIB; |
738 | ||
739 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { | |
740 | if (range->compress_type > BTRFS_COMPRESS_TYPES) | |
741 | return -EINVAL; | |
742 | if (range->compress_type) | |
743 | compress_type = range->compress_type; | |
744 | } | |
f46b5a66 | 745 | |
940100a4 CM |
746 | if (inode->i_size == 0) |
747 | return 0; | |
748 | ||
1e701a32 CM |
749 | if (range->start + range->len > range->start) { |
750 | last_index = min_t(u64, inode->i_size - 1, | |
751 | range->start + range->len - 1) >> PAGE_CACHE_SHIFT; | |
752 | } else { | |
753 | last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; | |
754 | } | |
755 | ||
756 | i = range->start >> PAGE_CACHE_SHIFT; | |
940100a4 CM |
757 | while (i <= last_index) { |
758 | if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, | |
1e701a32 CM |
759 | PAGE_CACHE_SIZE, |
760 | range->extent_thresh, | |
761 | &last_len, &skip, | |
940100a4 CM |
762 | &defrag_end)) { |
763 | unsigned long next; | |
764 | /* | |
765 | * the should_defrag function tells us how much to skip | |
766 | * bump our counter by the suggested amount | |
767 | */ | |
768 | next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
769 | i = max(i + 1, next); | |
770 | continue; | |
771 | } | |
f46b5a66 | 772 | |
f46b5a66 CH |
773 | if (total_read % ra_pages == 0) { |
774 | btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, | |
775 | min(last_index, i + ra_pages - 1)); | |
776 | } | |
777 | total_read++; | |
940100a4 | 778 | mutex_lock(&inode->i_mutex); |
1e701a32 | 779 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) |
1a419d85 | 780 | BTRFS_I(inode)->force_compress = compress_type; |
940100a4 | 781 | |
0ca1f7ce YZ |
782 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
783 | if (ret) | |
784 | goto err_unlock; | |
3eaa2885 | 785 | again: |
940100a4 CM |
786 | if (inode->i_size == 0 || |
787 | i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) { | |
788 | ret = 0; | |
789 | goto err_reservations; | |
790 | } | |
791 | ||
f46b5a66 | 792 | page = grab_cache_page(inode->i_mapping, i); |
0ca1f7ce YZ |
793 | if (!page) { |
794 | ret = -ENOMEM; | |
940100a4 | 795 | goto err_reservations; |
0ca1f7ce | 796 | } |
940100a4 | 797 | |
f46b5a66 CH |
798 | if (!PageUptodate(page)) { |
799 | btrfs_readpage(NULL, page); | |
800 | lock_page(page); | |
801 | if (!PageUptodate(page)) { | |
802 | unlock_page(page); | |
803 | page_cache_release(page); | |
0ca1f7ce | 804 | ret = -EIO; |
940100a4 | 805 | goto err_reservations; |
f46b5a66 CH |
806 | } |
807 | } | |
808 | ||
940100a4 CM |
809 | if (page->mapping != inode->i_mapping) { |
810 | unlock_page(page); | |
811 | page_cache_release(page); | |
812 | goto again; | |
813 | } | |
814 | ||
f46b5a66 | 815 | wait_on_page_writeback(page); |
f46b5a66 | 816 | |
940100a4 | 817 | if (PageDirty(page)) { |
0ca1f7ce | 818 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
940100a4 CM |
819 | goto loop_unlock; |
820 | } | |
821 | ||
f46b5a66 CH |
822 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
823 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
f46b5a66 | 824 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
3eaa2885 CM |
825 | |
826 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
827 | if (ordered) { | |
828 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
829 | unlock_page(page); | |
830 | page_cache_release(page); | |
831 | btrfs_start_ordered_extent(inode, ordered, 1); | |
832 | btrfs_put_ordered_extent(ordered); | |
833 | goto again; | |
834 | } | |
835 | set_page_extent_mapped(page); | |
836 | ||
f87f057b CM |
837 | /* |
838 | * this makes sure page_mkwrite is called on the | |
839 | * page if it is dirtied again later | |
840 | */ | |
841 | clear_page_dirty_for_io(page); | |
940100a4 CM |
842 | clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, |
843 | page_end, EXTENT_DIRTY | EXTENT_DELALLOC | | |
844 | EXTENT_DO_ACCOUNTING, GFP_NOFS); | |
f87f057b | 845 | |
2ac55d41 | 846 | btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); |
940100a4 | 847 | ClearPageChecked(page); |
f46b5a66 | 848 | set_page_dirty(page); |
a1ed835e | 849 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
940100a4 CM |
850 | |
851 | loop_unlock: | |
f46b5a66 CH |
852 | unlock_page(page); |
853 | page_cache_release(page); | |
940100a4 CM |
854 | mutex_unlock(&inode->i_mutex); |
855 | ||
f46b5a66 | 856 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); |
940100a4 | 857 | i++; |
f46b5a66 CH |
858 | } |
859 | ||
1e701a32 CM |
860 | if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) |
861 | filemap_flush(inode->i_mapping); | |
862 | ||
863 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
864 | /* the filemap_flush will queue IO into the worker threads, but | |
865 | * we have to make sure the IO is actually started and that | |
866 | * ordered extents get created before we return | |
867 | */ | |
868 | atomic_inc(&root->fs_info->async_submit_draining); | |
869 | while (atomic_read(&root->fs_info->nr_async_submits) || | |
870 | atomic_read(&root->fs_info->async_delalloc_pages)) { | |
871 | wait_event(root->fs_info->async_submit_wait, | |
872 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && | |
873 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); | |
874 | } | |
875 | atomic_dec(&root->fs_info->async_submit_draining); | |
876 | ||
877 | mutex_lock(&inode->i_mutex); | |
261507a0 | 878 | BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; |
1e701a32 CM |
879 | mutex_unlock(&inode->i_mutex); |
880 | } | |
881 | ||
1a419d85 LZ |
882 | disk_super = &root->fs_info->super_copy; |
883 | features = btrfs_super_incompat_flags(disk_super); | |
884 | if (range->compress_type == BTRFS_COMPRESS_LZO) { | |
885 | features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; | |
886 | btrfs_set_super_incompat_flags(disk_super, features); | |
887 | } | |
888 | ||
f46b5a66 | 889 | return 0; |
940100a4 CM |
890 | |
891 | err_reservations: | |
0ca1f7ce YZ |
892 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
893 | err_unlock: | |
940100a4 | 894 | mutex_unlock(&inode->i_mutex); |
940100a4 | 895 | return ret; |
f46b5a66 CH |
896 | } |
897 | ||
76dda93c YZ |
898 | static noinline int btrfs_ioctl_resize(struct btrfs_root *root, |
899 | void __user *arg) | |
f46b5a66 CH |
900 | { |
901 | u64 new_size; | |
902 | u64 old_size; | |
903 | u64 devid = 1; | |
904 | struct btrfs_ioctl_vol_args *vol_args; | |
905 | struct btrfs_trans_handle *trans; | |
906 | struct btrfs_device *device = NULL; | |
907 | char *sizestr; | |
908 | char *devstr = NULL; | |
909 | int ret = 0; | |
f46b5a66 CH |
910 | int mod = 0; |
911 | ||
c146afad YZ |
912 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
913 | return -EROFS; | |
914 | ||
e441d54d CM |
915 | if (!capable(CAP_SYS_ADMIN)) |
916 | return -EPERM; | |
917 | ||
dae7b665 LZ |
918 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
919 | if (IS_ERR(vol_args)) | |
920 | return PTR_ERR(vol_args); | |
5516e595 MF |
921 | |
922 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 923 | |
7d9eb12c | 924 | mutex_lock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
925 | sizestr = vol_args->name; |
926 | devstr = strchr(sizestr, ':'); | |
927 | if (devstr) { | |
928 | char *end; | |
929 | sizestr = devstr + 1; | |
930 | *devstr = '\0'; | |
931 | devstr = vol_args->name; | |
932 | devid = simple_strtoull(devstr, &end, 10); | |
21380931 JB |
933 | printk(KERN_INFO "resizing devid %llu\n", |
934 | (unsigned long long)devid); | |
f46b5a66 | 935 | } |
2b82032c | 936 | device = btrfs_find_device(root, devid, NULL, NULL); |
f46b5a66 | 937 | if (!device) { |
21380931 JB |
938 | printk(KERN_INFO "resizer unable to find device %llu\n", |
939 | (unsigned long long)devid); | |
f46b5a66 CH |
940 | ret = -EINVAL; |
941 | goto out_unlock; | |
942 | } | |
943 | if (!strcmp(sizestr, "max")) | |
944 | new_size = device->bdev->bd_inode->i_size; | |
945 | else { | |
946 | if (sizestr[0] == '-') { | |
947 | mod = -1; | |
948 | sizestr++; | |
949 | } else if (sizestr[0] == '+') { | |
950 | mod = 1; | |
951 | sizestr++; | |
952 | } | |
91748467 | 953 | new_size = memparse(sizestr, NULL); |
f46b5a66 CH |
954 | if (new_size == 0) { |
955 | ret = -EINVAL; | |
956 | goto out_unlock; | |
957 | } | |
958 | } | |
959 | ||
960 | old_size = device->total_bytes; | |
961 | ||
962 | if (mod < 0) { | |
963 | if (new_size > old_size) { | |
964 | ret = -EINVAL; | |
965 | goto out_unlock; | |
966 | } | |
967 | new_size = old_size - new_size; | |
968 | } else if (mod > 0) { | |
969 | new_size = old_size + new_size; | |
970 | } | |
971 | ||
972 | if (new_size < 256 * 1024 * 1024) { | |
973 | ret = -EINVAL; | |
974 | goto out_unlock; | |
975 | } | |
976 | if (new_size > device->bdev->bd_inode->i_size) { | |
977 | ret = -EFBIG; | |
978 | goto out_unlock; | |
979 | } | |
980 | ||
981 | do_div(new_size, root->sectorsize); | |
982 | new_size *= root->sectorsize; | |
983 | ||
984 | printk(KERN_INFO "new size for %s is %llu\n", | |
985 | device->name, (unsigned long long)new_size); | |
986 | ||
987 | if (new_size > old_size) { | |
a22285a6 | 988 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
989 | if (IS_ERR(trans)) { |
990 | ret = PTR_ERR(trans); | |
991 | goto out_unlock; | |
992 | } | |
f46b5a66 CH |
993 | ret = btrfs_grow_device(trans, device, new_size); |
994 | btrfs_commit_transaction(trans, root); | |
995 | } else { | |
996 | ret = btrfs_shrink_device(device, new_size); | |
997 | } | |
998 | ||
999 | out_unlock: | |
7d9eb12c | 1000 | mutex_unlock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
1001 | kfree(vol_args); |
1002 | return ret; | |
1003 | } | |
1004 | ||
72fd032e SW |
1005 | static noinline int btrfs_ioctl_snap_create_transid(struct file *file, |
1006 | char *name, | |
1007 | unsigned long fd, | |
1008 | int subvol, | |
b83cc969 LZ |
1009 | u64 *transid, |
1010 | bool readonly) | |
f46b5a66 | 1011 | { |
cb8e7090 | 1012 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
3de4586c | 1013 | struct file *src_file; |
f46b5a66 | 1014 | int namelen; |
3de4586c | 1015 | int ret = 0; |
f46b5a66 | 1016 | |
c146afad YZ |
1017 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
1018 | return -EROFS; | |
1019 | ||
72fd032e SW |
1020 | namelen = strlen(name); |
1021 | if (strchr(name, '/')) { | |
f46b5a66 CH |
1022 | ret = -EINVAL; |
1023 | goto out; | |
1024 | } | |
1025 | ||
3de4586c | 1026 | if (subvol) { |
72fd032e | 1027 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
b83cc969 | 1028 | NULL, transid, readonly); |
cb8e7090 | 1029 | } else { |
3de4586c | 1030 | struct inode *src_inode; |
72fd032e | 1031 | src_file = fget(fd); |
3de4586c CM |
1032 | if (!src_file) { |
1033 | ret = -EINVAL; | |
1034 | goto out; | |
1035 | } | |
1036 | ||
1037 | src_inode = src_file->f_path.dentry->d_inode; | |
1038 | if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { | |
d397712b CM |
1039 | printk(KERN_INFO "btrfs: Snapshot src from " |
1040 | "another FS\n"); | |
3de4586c CM |
1041 | ret = -EINVAL; |
1042 | fput(src_file); | |
1043 | goto out; | |
1044 | } | |
72fd032e SW |
1045 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
1046 | BTRFS_I(src_inode)->root, | |
b83cc969 | 1047 | transid, readonly); |
3de4586c | 1048 | fput(src_file); |
cb8e7090 | 1049 | } |
f46b5a66 | 1050 | out: |
72fd032e SW |
1051 | return ret; |
1052 | } | |
1053 | ||
1054 | static noinline int btrfs_ioctl_snap_create(struct file *file, | |
fa0d2b9b | 1055 | void __user *arg, int subvol) |
72fd032e | 1056 | { |
fa0d2b9b | 1057 | struct btrfs_ioctl_vol_args *vol_args; |
72fd032e SW |
1058 | int ret; |
1059 | ||
fa0d2b9b LZ |
1060 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1061 | if (IS_ERR(vol_args)) | |
1062 | return PTR_ERR(vol_args); | |
1063 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
72fd032e | 1064 | |
fa0d2b9b | 1065 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, |
b83cc969 LZ |
1066 | vol_args->fd, subvol, |
1067 | NULL, false); | |
fdfb1e4f | 1068 | |
fa0d2b9b LZ |
1069 | kfree(vol_args); |
1070 | return ret; | |
1071 | } | |
fdfb1e4f | 1072 | |
fa0d2b9b LZ |
1073 | static noinline int btrfs_ioctl_snap_create_v2(struct file *file, |
1074 | void __user *arg, int subvol) | |
1075 | { | |
1076 | struct btrfs_ioctl_vol_args_v2 *vol_args; | |
1077 | int ret; | |
1078 | u64 transid = 0; | |
1079 | u64 *ptr = NULL; | |
b83cc969 | 1080 | bool readonly = false; |
75eaa0e2 | 1081 | |
fa0d2b9b LZ |
1082 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1083 | if (IS_ERR(vol_args)) | |
1084 | return PTR_ERR(vol_args); | |
1085 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; | |
75eaa0e2 | 1086 | |
b83cc969 LZ |
1087 | if (vol_args->flags & |
1088 | ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY)) { | |
1089 | ret = -EOPNOTSUPP; | |
fa0d2b9b | 1090 | goto out; |
72fd032e | 1091 | } |
fa0d2b9b LZ |
1092 | |
1093 | if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) | |
1094 | ptr = &transid; | |
b83cc969 LZ |
1095 | if (vol_args->flags & BTRFS_SUBVOL_RDONLY) |
1096 | readonly = true; | |
fa0d2b9b LZ |
1097 | |
1098 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, | |
b83cc969 LZ |
1099 | vol_args->fd, subvol, |
1100 | ptr, readonly); | |
fa0d2b9b LZ |
1101 | |
1102 | if (ret == 0 && ptr && | |
1103 | copy_to_user(arg + | |
1104 | offsetof(struct btrfs_ioctl_vol_args_v2, | |
1105 | transid), ptr, sizeof(*ptr))) | |
1106 | ret = -EFAULT; | |
fdfb1e4f | 1107 | out: |
f46b5a66 CH |
1108 | kfree(vol_args); |
1109 | return ret; | |
1110 | } | |
1111 | ||
0caa102d LZ |
1112 | static noinline int btrfs_ioctl_subvol_getflags(struct file *file, |
1113 | void __user *arg) | |
1114 | { | |
1115 | struct inode *inode = fdentry(file)->d_inode; | |
1116 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1117 | int ret = 0; | |
1118 | u64 flags = 0; | |
1119 | ||
1120 | if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) | |
1121 | return -EINVAL; | |
1122 | ||
1123 | down_read(&root->fs_info->subvol_sem); | |
1124 | if (btrfs_root_readonly(root)) | |
1125 | flags |= BTRFS_SUBVOL_RDONLY; | |
1126 | up_read(&root->fs_info->subvol_sem); | |
1127 | ||
1128 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
1129 | ret = -EFAULT; | |
1130 | ||
1131 | return ret; | |
1132 | } | |
1133 | ||
1134 | static noinline int btrfs_ioctl_subvol_setflags(struct file *file, | |
1135 | void __user *arg) | |
1136 | { | |
1137 | struct inode *inode = fdentry(file)->d_inode; | |
1138 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1139 | struct btrfs_trans_handle *trans; | |
1140 | u64 root_flags; | |
1141 | u64 flags; | |
1142 | int ret = 0; | |
1143 | ||
1144 | if (root->fs_info->sb->s_flags & MS_RDONLY) | |
1145 | return -EROFS; | |
1146 | ||
1147 | if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) | |
1148 | return -EINVAL; | |
1149 | ||
1150 | if (copy_from_user(&flags, arg, sizeof(flags))) | |
1151 | return -EFAULT; | |
1152 | ||
b4dc2b8c | 1153 | if (flags & BTRFS_SUBVOL_CREATE_ASYNC) |
0caa102d LZ |
1154 | return -EINVAL; |
1155 | ||
1156 | if (flags & ~BTRFS_SUBVOL_RDONLY) | |
1157 | return -EOPNOTSUPP; | |
1158 | ||
b4dc2b8c LZ |
1159 | if (!is_owner_or_cap(inode)) |
1160 | return -EACCES; | |
1161 | ||
0caa102d LZ |
1162 | down_write(&root->fs_info->subvol_sem); |
1163 | ||
1164 | /* nothing to do */ | |
1165 | if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) | |
1166 | goto out; | |
1167 | ||
1168 | root_flags = btrfs_root_flags(&root->root_item); | |
1169 | if (flags & BTRFS_SUBVOL_RDONLY) | |
1170 | btrfs_set_root_flags(&root->root_item, | |
1171 | root_flags | BTRFS_ROOT_SUBVOL_RDONLY); | |
1172 | else | |
1173 | btrfs_set_root_flags(&root->root_item, | |
1174 | root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); | |
1175 | ||
1176 | trans = btrfs_start_transaction(root, 1); | |
1177 | if (IS_ERR(trans)) { | |
1178 | ret = PTR_ERR(trans); | |
1179 | goto out_reset; | |
1180 | } | |
1181 | ||
b4dc2b8c | 1182 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
0caa102d LZ |
1183 | &root->root_key, &root->root_item); |
1184 | ||
1185 | btrfs_commit_transaction(trans, root); | |
1186 | out_reset: | |
1187 | if (ret) | |
1188 | btrfs_set_root_flags(&root->root_item, root_flags); | |
1189 | out: | |
1190 | up_write(&root->fs_info->subvol_sem); | |
1191 | return ret; | |
1192 | } | |
1193 | ||
76dda93c YZ |
1194 | /* |
1195 | * helper to check if the subvolume references other subvolumes | |
1196 | */ | |
1197 | static noinline int may_destroy_subvol(struct btrfs_root *root) | |
1198 | { | |
1199 | struct btrfs_path *path; | |
1200 | struct btrfs_key key; | |
1201 | int ret; | |
1202 | ||
1203 | path = btrfs_alloc_path(); | |
1204 | if (!path) | |
1205 | return -ENOMEM; | |
1206 | ||
1207 | key.objectid = root->root_key.objectid; | |
1208 | key.type = BTRFS_ROOT_REF_KEY; | |
1209 | key.offset = (u64)-1; | |
1210 | ||
1211 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, | |
1212 | &key, path, 0, 0); | |
1213 | if (ret < 0) | |
1214 | goto out; | |
1215 | BUG_ON(ret == 0); | |
1216 | ||
1217 | ret = 0; | |
1218 | if (path->slots[0] > 0) { | |
1219 | path->slots[0]--; | |
1220 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1221 | if (key.objectid == root->root_key.objectid && | |
1222 | key.type == BTRFS_ROOT_REF_KEY) | |
1223 | ret = -ENOTEMPTY; | |
1224 | } | |
1225 | out: | |
1226 | btrfs_free_path(path); | |
1227 | return ret; | |
1228 | } | |
1229 | ||
ac8e9819 CM |
1230 | static noinline int key_in_sk(struct btrfs_key *key, |
1231 | struct btrfs_ioctl_search_key *sk) | |
1232 | { | |
abc6e134 CM |
1233 | struct btrfs_key test; |
1234 | int ret; | |
1235 | ||
1236 | test.objectid = sk->min_objectid; | |
1237 | test.type = sk->min_type; | |
1238 | test.offset = sk->min_offset; | |
1239 | ||
1240 | ret = btrfs_comp_cpu_keys(key, &test); | |
1241 | if (ret < 0) | |
ac8e9819 | 1242 | return 0; |
abc6e134 CM |
1243 | |
1244 | test.objectid = sk->max_objectid; | |
1245 | test.type = sk->max_type; | |
1246 | test.offset = sk->max_offset; | |
1247 | ||
1248 | ret = btrfs_comp_cpu_keys(key, &test); | |
1249 | if (ret > 0) | |
ac8e9819 CM |
1250 | return 0; |
1251 | return 1; | |
1252 | } | |
1253 | ||
1254 | static noinline int copy_to_sk(struct btrfs_root *root, | |
1255 | struct btrfs_path *path, | |
1256 | struct btrfs_key *key, | |
1257 | struct btrfs_ioctl_search_key *sk, | |
1258 | char *buf, | |
1259 | unsigned long *sk_offset, | |
1260 | int *num_found) | |
1261 | { | |
1262 | u64 found_transid; | |
1263 | struct extent_buffer *leaf; | |
1264 | struct btrfs_ioctl_search_header sh; | |
1265 | unsigned long item_off; | |
1266 | unsigned long item_len; | |
1267 | int nritems; | |
1268 | int i; | |
1269 | int slot; | |
1270 | int found = 0; | |
1271 | int ret = 0; | |
1272 | ||
1273 | leaf = path->nodes[0]; | |
1274 | slot = path->slots[0]; | |
1275 | nritems = btrfs_header_nritems(leaf); | |
1276 | ||
1277 | if (btrfs_header_generation(leaf) > sk->max_transid) { | |
1278 | i = nritems; | |
1279 | goto advance_key; | |
1280 | } | |
1281 | found_transid = btrfs_header_generation(leaf); | |
1282 | ||
1283 | for (i = slot; i < nritems; i++) { | |
1284 | item_off = btrfs_item_ptr_offset(leaf, i); | |
1285 | item_len = btrfs_item_size_nr(leaf, i); | |
1286 | ||
1287 | if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) | |
1288 | item_len = 0; | |
1289 | ||
1290 | if (sizeof(sh) + item_len + *sk_offset > | |
1291 | BTRFS_SEARCH_ARGS_BUFSIZE) { | |
1292 | ret = 1; | |
1293 | goto overflow; | |
1294 | } | |
1295 | ||
1296 | btrfs_item_key_to_cpu(leaf, key, i); | |
1297 | if (!key_in_sk(key, sk)) | |
1298 | continue; | |
1299 | ||
1300 | sh.objectid = key->objectid; | |
1301 | sh.offset = key->offset; | |
1302 | sh.type = key->type; | |
1303 | sh.len = item_len; | |
1304 | sh.transid = found_transid; | |
1305 | ||
1306 | /* copy search result header */ | |
1307 | memcpy(buf + *sk_offset, &sh, sizeof(sh)); | |
1308 | *sk_offset += sizeof(sh); | |
1309 | ||
1310 | if (item_len) { | |
1311 | char *p = buf + *sk_offset; | |
1312 | /* copy the item */ | |
1313 | read_extent_buffer(leaf, p, | |
1314 | item_off, item_len); | |
1315 | *sk_offset += item_len; | |
ac8e9819 | 1316 | } |
90fdde14 | 1317 | found++; |
ac8e9819 CM |
1318 | |
1319 | if (*num_found >= sk->nr_items) | |
1320 | break; | |
1321 | } | |
1322 | advance_key: | |
abc6e134 CM |
1323 | ret = 0; |
1324 | if (key->offset < (u64)-1 && key->offset < sk->max_offset) | |
ac8e9819 | 1325 | key->offset++; |
abc6e134 CM |
1326 | else if (key->type < (u8)-1 && key->type < sk->max_type) { |
1327 | key->offset = 0; | |
ac8e9819 | 1328 | key->type++; |
abc6e134 CM |
1329 | } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { |
1330 | key->offset = 0; | |
1331 | key->type = 0; | |
ac8e9819 | 1332 | key->objectid++; |
abc6e134 CM |
1333 | } else |
1334 | ret = 1; | |
ac8e9819 CM |
1335 | overflow: |
1336 | *num_found += found; | |
1337 | return ret; | |
1338 | } | |
1339 | ||
1340 | static noinline int search_ioctl(struct inode *inode, | |
1341 | struct btrfs_ioctl_search_args *args) | |
1342 | { | |
1343 | struct btrfs_root *root; | |
1344 | struct btrfs_key key; | |
1345 | struct btrfs_key max_key; | |
1346 | struct btrfs_path *path; | |
1347 | struct btrfs_ioctl_search_key *sk = &args->key; | |
1348 | struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; | |
1349 | int ret; | |
1350 | int num_found = 0; | |
1351 | unsigned long sk_offset = 0; | |
1352 | ||
1353 | path = btrfs_alloc_path(); | |
1354 | if (!path) | |
1355 | return -ENOMEM; | |
1356 | ||
1357 | if (sk->tree_id == 0) { | |
1358 | /* search the root of the inode that was passed */ | |
1359 | root = BTRFS_I(inode)->root; | |
1360 | } else { | |
1361 | key.objectid = sk->tree_id; | |
1362 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1363 | key.offset = (u64)-1; | |
1364 | root = btrfs_read_fs_root_no_name(info, &key); | |
1365 | if (IS_ERR(root)) { | |
1366 | printk(KERN_ERR "could not find root %llu\n", | |
1367 | sk->tree_id); | |
1368 | btrfs_free_path(path); | |
1369 | return -ENOENT; | |
1370 | } | |
1371 | } | |
1372 | ||
1373 | key.objectid = sk->min_objectid; | |
1374 | key.type = sk->min_type; | |
1375 | key.offset = sk->min_offset; | |
1376 | ||
1377 | max_key.objectid = sk->max_objectid; | |
1378 | max_key.type = sk->max_type; | |
1379 | max_key.offset = sk->max_offset; | |
1380 | ||
1381 | path->keep_locks = 1; | |
1382 | ||
1383 | while(1) { | |
1384 | ret = btrfs_search_forward(root, &key, &max_key, path, 0, | |
1385 | sk->min_transid); | |
1386 | if (ret != 0) { | |
1387 | if (ret > 0) | |
1388 | ret = 0; | |
1389 | goto err; | |
1390 | } | |
1391 | ret = copy_to_sk(root, path, &key, sk, args->buf, | |
1392 | &sk_offset, &num_found); | |
1393 | btrfs_release_path(root, path); | |
1394 | if (ret || num_found >= sk->nr_items) | |
1395 | break; | |
1396 | ||
1397 | } | |
1398 | ret = 0; | |
1399 | err: | |
1400 | sk->nr_items = num_found; | |
1401 | btrfs_free_path(path); | |
1402 | return ret; | |
1403 | } | |
1404 | ||
1405 | static noinline int btrfs_ioctl_tree_search(struct file *file, | |
1406 | void __user *argp) | |
1407 | { | |
1408 | struct btrfs_ioctl_search_args *args; | |
1409 | struct inode *inode; | |
1410 | int ret; | |
1411 | ||
1412 | if (!capable(CAP_SYS_ADMIN)) | |
1413 | return -EPERM; | |
1414 | ||
2354d08f JL |
1415 | args = memdup_user(argp, sizeof(*args)); |
1416 | if (IS_ERR(args)) | |
1417 | return PTR_ERR(args); | |
ac8e9819 | 1418 | |
ac8e9819 CM |
1419 | inode = fdentry(file)->d_inode; |
1420 | ret = search_ioctl(inode, args); | |
1421 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
1422 | ret = -EFAULT; | |
1423 | kfree(args); | |
1424 | return ret; | |
1425 | } | |
1426 | ||
98d377a0 | 1427 | /* |
ac8e9819 CM |
1428 | * Search INODE_REFs to identify path name of 'dirid' directory |
1429 | * in a 'tree_id' tree. and sets path name to 'name'. | |
1430 | */ | |
98d377a0 TH |
1431 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
1432 | u64 tree_id, u64 dirid, char *name) | |
1433 | { | |
1434 | struct btrfs_root *root; | |
1435 | struct btrfs_key key; | |
ac8e9819 | 1436 | char *ptr; |
98d377a0 TH |
1437 | int ret = -1; |
1438 | int slot; | |
1439 | int len; | |
1440 | int total_len = 0; | |
1441 | struct btrfs_inode_ref *iref; | |
1442 | struct extent_buffer *l; | |
1443 | struct btrfs_path *path; | |
1444 | ||
1445 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { | |
1446 | name[0]='\0'; | |
1447 | return 0; | |
1448 | } | |
1449 | ||
1450 | path = btrfs_alloc_path(); | |
1451 | if (!path) | |
1452 | return -ENOMEM; | |
1453 | ||
ac8e9819 | 1454 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; |
98d377a0 TH |
1455 | |
1456 | key.objectid = tree_id; | |
1457 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1458 | key.offset = (u64)-1; | |
1459 | root = btrfs_read_fs_root_no_name(info, &key); | |
1460 | if (IS_ERR(root)) { | |
1461 | printk(KERN_ERR "could not find root %llu\n", tree_id); | |
8ad6fcab CM |
1462 | ret = -ENOENT; |
1463 | goto out; | |
98d377a0 TH |
1464 | } |
1465 | ||
1466 | key.objectid = dirid; | |
1467 | key.type = BTRFS_INODE_REF_KEY; | |
8ad6fcab | 1468 | key.offset = (u64)-1; |
98d377a0 TH |
1469 | |
1470 | while(1) { | |
1471 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1472 | if (ret < 0) | |
1473 | goto out; | |
1474 | ||
1475 | l = path->nodes[0]; | |
1476 | slot = path->slots[0]; | |
8ad6fcab CM |
1477 | if (ret > 0 && slot > 0) |
1478 | slot--; | |
98d377a0 TH |
1479 | btrfs_item_key_to_cpu(l, &key, slot); |
1480 | ||
1481 | if (ret > 0 && (key.objectid != dirid || | |
ac8e9819 CM |
1482 | key.type != BTRFS_INODE_REF_KEY)) { |
1483 | ret = -ENOENT; | |
98d377a0 | 1484 | goto out; |
ac8e9819 | 1485 | } |
98d377a0 TH |
1486 | |
1487 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); | |
1488 | len = btrfs_inode_ref_name_len(l, iref); | |
1489 | ptr -= len + 1; | |
1490 | total_len += len + 1; | |
ac8e9819 | 1491 | if (ptr < name) |
98d377a0 TH |
1492 | goto out; |
1493 | ||
1494 | *(ptr + len) = '/'; | |
1495 | read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); | |
1496 | ||
1497 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) | |
1498 | break; | |
1499 | ||
1500 | btrfs_release_path(root, path); | |
1501 | key.objectid = key.offset; | |
8ad6fcab | 1502 | key.offset = (u64)-1; |
98d377a0 TH |
1503 | dirid = key.objectid; |
1504 | ||
1505 | } | |
ac8e9819 | 1506 | if (ptr < name) |
98d377a0 | 1507 | goto out; |
ac8e9819 | 1508 | memcpy(name, ptr, total_len); |
98d377a0 TH |
1509 | name[total_len]='\0'; |
1510 | ret = 0; | |
1511 | out: | |
1512 | btrfs_free_path(path); | |
ac8e9819 CM |
1513 | return ret; |
1514 | } | |
1515 | ||
1516 | static noinline int btrfs_ioctl_ino_lookup(struct file *file, | |
1517 | void __user *argp) | |
1518 | { | |
1519 | struct btrfs_ioctl_ino_lookup_args *args; | |
1520 | struct inode *inode; | |
1521 | int ret; | |
1522 | ||
1523 | if (!capable(CAP_SYS_ADMIN)) | |
1524 | return -EPERM; | |
1525 | ||
2354d08f JL |
1526 | args = memdup_user(argp, sizeof(*args)); |
1527 | if (IS_ERR(args)) | |
1528 | return PTR_ERR(args); | |
c2b96929 | 1529 | |
ac8e9819 CM |
1530 | inode = fdentry(file)->d_inode; |
1531 | ||
1b53ac4d CM |
1532 | if (args->treeid == 0) |
1533 | args->treeid = BTRFS_I(inode)->root->root_key.objectid; | |
1534 | ||
ac8e9819 CM |
1535 | ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, |
1536 | args->treeid, args->objectid, | |
1537 | args->name); | |
1538 | ||
1539 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
1540 | ret = -EFAULT; | |
1541 | ||
1542 | kfree(args); | |
98d377a0 TH |
1543 | return ret; |
1544 | } | |
1545 | ||
76dda93c YZ |
1546 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
1547 | void __user *arg) | |
1548 | { | |
1549 | struct dentry *parent = fdentry(file); | |
1550 | struct dentry *dentry; | |
1551 | struct inode *dir = parent->d_inode; | |
1552 | struct inode *inode; | |
1553 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1554 | struct btrfs_root *dest = NULL; | |
1555 | struct btrfs_ioctl_vol_args *vol_args; | |
1556 | struct btrfs_trans_handle *trans; | |
1557 | int namelen; | |
1558 | int ret; | |
1559 | int err = 0; | |
1560 | ||
76dda93c YZ |
1561 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1562 | if (IS_ERR(vol_args)) | |
1563 | return PTR_ERR(vol_args); | |
1564 | ||
1565 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
1566 | namelen = strlen(vol_args->name); | |
1567 | if (strchr(vol_args->name, '/') || | |
1568 | strncmp(vol_args->name, "..", namelen) == 0) { | |
1569 | err = -EINVAL; | |
1570 | goto out; | |
1571 | } | |
1572 | ||
1573 | err = mnt_want_write(file->f_path.mnt); | |
1574 | if (err) | |
1575 | goto out; | |
1576 | ||
1577 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
1578 | dentry = lookup_one_len(vol_args->name, parent, namelen); | |
1579 | if (IS_ERR(dentry)) { | |
1580 | err = PTR_ERR(dentry); | |
1581 | goto out_unlock_dir; | |
1582 | } | |
1583 | ||
1584 | if (!dentry->d_inode) { | |
1585 | err = -ENOENT; | |
1586 | goto out_dput; | |
1587 | } | |
1588 | ||
1589 | inode = dentry->d_inode; | |
4260f7c7 SW |
1590 | dest = BTRFS_I(inode)->root; |
1591 | if (!capable(CAP_SYS_ADMIN)){ | |
1592 | /* | |
1593 | * Regular user. Only allow this with a special mount | |
1594 | * option, when the user has write+exec access to the | |
1595 | * subvol root, and when rmdir(2) would have been | |
1596 | * allowed. | |
1597 | * | |
1598 | * Note that this is _not_ check that the subvol is | |
1599 | * empty or doesn't contain data that we wouldn't | |
1600 | * otherwise be able to delete. | |
1601 | * | |
1602 | * Users who want to delete empty subvols should try | |
1603 | * rmdir(2). | |
1604 | */ | |
1605 | err = -EPERM; | |
1606 | if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
1607 | goto out_dput; | |
1608 | ||
1609 | /* | |
1610 | * Do not allow deletion if the parent dir is the same | |
1611 | * as the dir to be deleted. That means the ioctl | |
1612 | * must be called on the dentry referencing the root | |
1613 | * of the subvol, not a random directory contained | |
1614 | * within it. | |
1615 | */ | |
1616 | err = -EINVAL; | |
1617 | if (root == dest) | |
1618 | goto out_dput; | |
1619 | ||
1620 | err = inode_permission(inode, MAY_WRITE | MAY_EXEC); | |
1621 | if (err) | |
1622 | goto out_dput; | |
1623 | ||
1624 | /* check if subvolume may be deleted by a non-root user */ | |
1625 | err = btrfs_may_delete(dir, dentry, 1); | |
1626 | if (err) | |
1627 | goto out_dput; | |
1628 | } | |
1629 | ||
76dda93c YZ |
1630 | if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { |
1631 | err = -EINVAL; | |
1632 | goto out_dput; | |
1633 | } | |
1634 | ||
76dda93c YZ |
1635 | mutex_lock(&inode->i_mutex); |
1636 | err = d_invalidate(dentry); | |
1637 | if (err) | |
1638 | goto out_unlock; | |
1639 | ||
1640 | down_write(&root->fs_info->subvol_sem); | |
1641 | ||
1642 | err = may_destroy_subvol(dest); | |
1643 | if (err) | |
1644 | goto out_up_write; | |
1645 | ||
a22285a6 YZ |
1646 | trans = btrfs_start_transaction(root, 0); |
1647 | if (IS_ERR(trans)) { | |
1648 | err = PTR_ERR(trans); | |
d327099a | 1649 | goto out_up_write; |
a22285a6 YZ |
1650 | } |
1651 | trans->block_rsv = &root->fs_info->global_block_rsv; | |
1652 | ||
76dda93c YZ |
1653 | ret = btrfs_unlink_subvol(trans, root, dir, |
1654 | dest->root_key.objectid, | |
1655 | dentry->d_name.name, | |
1656 | dentry->d_name.len); | |
1657 | BUG_ON(ret); | |
1658 | ||
1659 | btrfs_record_root_in_trans(trans, dest); | |
1660 | ||
1661 | memset(&dest->root_item.drop_progress, 0, | |
1662 | sizeof(dest->root_item.drop_progress)); | |
1663 | dest->root_item.drop_level = 0; | |
1664 | btrfs_set_root_refs(&dest->root_item, 0); | |
1665 | ||
d68fc57b YZ |
1666 | if (!xchg(&dest->orphan_item_inserted, 1)) { |
1667 | ret = btrfs_insert_orphan_item(trans, | |
1668 | root->fs_info->tree_root, | |
1669 | dest->root_key.objectid); | |
1670 | BUG_ON(ret); | |
1671 | } | |
76dda93c | 1672 | |
531cb13f | 1673 | ret = btrfs_end_transaction(trans, root); |
76dda93c YZ |
1674 | BUG_ON(ret); |
1675 | inode->i_flags |= S_DEAD; | |
1676 | out_up_write: | |
1677 | up_write(&root->fs_info->subvol_sem); | |
1678 | out_unlock: | |
1679 | mutex_unlock(&inode->i_mutex); | |
1680 | if (!err) { | |
efefb143 | 1681 | shrink_dcache_sb(root->fs_info->sb); |
76dda93c YZ |
1682 | btrfs_invalidate_inodes(dest); |
1683 | d_delete(dentry); | |
1684 | } | |
1685 | out_dput: | |
1686 | dput(dentry); | |
1687 | out_unlock_dir: | |
1688 | mutex_unlock(&dir->i_mutex); | |
1689 | mnt_drop_write(file->f_path.mnt); | |
1690 | out: | |
1691 | kfree(vol_args); | |
1692 | return err; | |
1693 | } | |
1694 | ||
1e701a32 | 1695 | static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
f46b5a66 CH |
1696 | { |
1697 | struct inode *inode = fdentry(file)->d_inode; | |
1698 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1e701a32 | 1699 | struct btrfs_ioctl_defrag_range_args *range; |
c146afad YZ |
1700 | int ret; |
1701 | ||
b83cc969 LZ |
1702 | if (btrfs_root_readonly(root)) |
1703 | return -EROFS; | |
1704 | ||
c146afad YZ |
1705 | ret = mnt_want_write(file->f_path.mnt); |
1706 | if (ret) | |
1707 | return ret; | |
f46b5a66 CH |
1708 | |
1709 | switch (inode->i_mode & S_IFMT) { | |
1710 | case S_IFDIR: | |
e441d54d CM |
1711 | if (!capable(CAP_SYS_ADMIN)) { |
1712 | ret = -EPERM; | |
1713 | goto out; | |
1714 | } | |
8929ecfa YZ |
1715 | ret = btrfs_defrag_root(root, 0); |
1716 | if (ret) | |
1717 | goto out; | |
1718 | ret = btrfs_defrag_root(root->fs_info->extent_root, 0); | |
f46b5a66 CH |
1719 | break; |
1720 | case S_IFREG: | |
e441d54d CM |
1721 | if (!(file->f_mode & FMODE_WRITE)) { |
1722 | ret = -EINVAL; | |
1723 | goto out; | |
1724 | } | |
1e701a32 CM |
1725 | |
1726 | range = kzalloc(sizeof(*range), GFP_KERNEL); | |
1727 | if (!range) { | |
1728 | ret = -ENOMEM; | |
1729 | goto out; | |
1730 | } | |
1731 | ||
1732 | if (argp) { | |
1733 | if (copy_from_user(range, argp, | |
1734 | sizeof(*range))) { | |
1735 | ret = -EFAULT; | |
1736 | kfree(range); | |
683be16e | 1737 | goto out; |
1e701a32 CM |
1738 | } |
1739 | /* compression requires us to start the IO */ | |
1740 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
1741 | range->flags |= BTRFS_DEFRAG_RANGE_START_IO; | |
1742 | range->extent_thresh = (u32)-1; | |
1743 | } | |
1744 | } else { | |
1745 | /* the rest are all set to zero by kzalloc */ | |
1746 | range->len = (u64)-1; | |
1747 | } | |
8929ecfa | 1748 | ret = btrfs_defrag_file(file, range); |
1e701a32 | 1749 | kfree(range); |
f46b5a66 | 1750 | break; |
8929ecfa YZ |
1751 | default: |
1752 | ret = -EINVAL; | |
f46b5a66 | 1753 | } |
e441d54d | 1754 | out: |
ab67b7c1 | 1755 | mnt_drop_write(file->f_path.mnt); |
e441d54d | 1756 | return ret; |
f46b5a66 CH |
1757 | } |
1758 | ||
b2950863 | 1759 | static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
1760 | { |
1761 | struct btrfs_ioctl_vol_args *vol_args; | |
1762 | int ret; | |
1763 | ||
e441d54d CM |
1764 | if (!capable(CAP_SYS_ADMIN)) |
1765 | return -EPERM; | |
1766 | ||
dae7b665 LZ |
1767 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1768 | if (IS_ERR(vol_args)) | |
1769 | return PTR_ERR(vol_args); | |
f46b5a66 | 1770 | |
5516e595 | 1771 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
1772 | ret = btrfs_init_new_device(root, vol_args->name); |
1773 | ||
f46b5a66 CH |
1774 | kfree(vol_args); |
1775 | return ret; | |
1776 | } | |
1777 | ||
b2950863 | 1778 | static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
1779 | { |
1780 | struct btrfs_ioctl_vol_args *vol_args; | |
1781 | int ret; | |
1782 | ||
e441d54d CM |
1783 | if (!capable(CAP_SYS_ADMIN)) |
1784 | return -EPERM; | |
1785 | ||
c146afad YZ |
1786 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
1787 | return -EROFS; | |
1788 | ||
dae7b665 LZ |
1789 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1790 | if (IS_ERR(vol_args)) | |
1791 | return PTR_ERR(vol_args); | |
f46b5a66 | 1792 | |
5516e595 | 1793 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
1794 | ret = btrfs_rm_device(root, vol_args->name); |
1795 | ||
f46b5a66 CH |
1796 | kfree(vol_args); |
1797 | return ret; | |
1798 | } | |
1799 | ||
76dda93c YZ |
1800 | static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, |
1801 | u64 off, u64 olen, u64 destoff) | |
f46b5a66 CH |
1802 | { |
1803 | struct inode *inode = fdentry(file)->d_inode; | |
1804 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1805 | struct file *src_file; | |
1806 | struct inode *src; | |
1807 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 1808 | struct btrfs_path *path; |
f46b5a66 | 1809 | struct extent_buffer *leaf; |
ae01a0ab YZ |
1810 | char *buf; |
1811 | struct btrfs_key key; | |
f46b5a66 CH |
1812 | u32 nritems; |
1813 | int slot; | |
ae01a0ab | 1814 | int ret; |
c5c9cd4d SW |
1815 | u64 len = olen; |
1816 | u64 bs = root->fs_info->sb->s_blocksize; | |
1817 | u64 hint_byte; | |
d20f7043 | 1818 | |
c5c9cd4d SW |
1819 | /* |
1820 | * TODO: | |
1821 | * - split compressed inline extents. annoying: we need to | |
1822 | * decompress into destination's address_space (the file offset | |
1823 | * may change, so source mapping won't do), then recompress (or | |
1824 | * otherwise reinsert) a subrange. | |
1825 | * - allow ranges within the same file to be cloned (provided | |
1826 | * they don't overlap)? | |
1827 | */ | |
1828 | ||
e441d54d | 1829 | /* the destination must be opened for writing */ |
2ebc3464 | 1830 | if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) |
e441d54d CM |
1831 | return -EINVAL; |
1832 | ||
b83cc969 LZ |
1833 | if (btrfs_root_readonly(root)) |
1834 | return -EROFS; | |
1835 | ||
c146afad YZ |
1836 | ret = mnt_want_write(file->f_path.mnt); |
1837 | if (ret) | |
1838 | return ret; | |
1839 | ||
c5c9cd4d | 1840 | src_file = fget(srcfd); |
ab67b7c1 YZ |
1841 | if (!src_file) { |
1842 | ret = -EBADF; | |
1843 | goto out_drop_write; | |
1844 | } | |
5dc64164 | 1845 | |
f46b5a66 CH |
1846 | src = src_file->f_dentry->d_inode; |
1847 | ||
c5c9cd4d SW |
1848 | ret = -EINVAL; |
1849 | if (src == inode) | |
1850 | goto out_fput; | |
1851 | ||
5dc64164 DR |
1852 | /* the src must be open for reading */ |
1853 | if (!(src_file->f_mode & FMODE_READ)) | |
1854 | goto out_fput; | |
1855 | ||
ae01a0ab YZ |
1856 | ret = -EISDIR; |
1857 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) | |
1858 | goto out_fput; | |
1859 | ||
f46b5a66 | 1860 | ret = -EXDEV; |
ae01a0ab YZ |
1861 | if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) |
1862 | goto out_fput; | |
1863 | ||
1864 | ret = -ENOMEM; | |
1865 | buf = vmalloc(btrfs_level_size(root, 0)); | |
1866 | if (!buf) | |
1867 | goto out_fput; | |
1868 | ||
1869 | path = btrfs_alloc_path(); | |
1870 | if (!path) { | |
1871 | vfree(buf); | |
f46b5a66 | 1872 | goto out_fput; |
ae01a0ab YZ |
1873 | } |
1874 | path->reada = 2; | |
f46b5a66 CH |
1875 | |
1876 | if (inode < src) { | |
fccdae43 SW |
1877 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); |
1878 | mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); | |
f46b5a66 | 1879 | } else { |
fccdae43 SW |
1880 | mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); |
1881 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); | |
f46b5a66 CH |
1882 | } |
1883 | ||
c5c9cd4d SW |
1884 | /* determine range to clone */ |
1885 | ret = -EINVAL; | |
2ebc3464 | 1886 | if (off + len > src->i_size || off + len < off) |
f46b5a66 | 1887 | goto out_unlock; |
c5c9cd4d SW |
1888 | if (len == 0) |
1889 | olen = len = src->i_size - off; | |
1890 | /* if we extend to eof, continue to block boundary */ | |
1891 | if (off + len == src->i_size) | |
2a6b8dae | 1892 | len = ALIGN(src->i_size, bs) - off; |
c5c9cd4d SW |
1893 | |
1894 | /* verify the end result is block aligned */ | |
2a6b8dae LZ |
1895 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || |
1896 | !IS_ALIGNED(destoff, bs)) | |
c5c9cd4d SW |
1897 | goto out_unlock; |
1898 | ||
f46b5a66 CH |
1899 | /* do any pending delalloc/csum calc on src, one way or |
1900 | another, and lock file content */ | |
1901 | while (1) { | |
31840ae1 | 1902 | struct btrfs_ordered_extent *ordered; |
c5c9cd4d | 1903 | lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
9a019196 SW |
1904 | ordered = btrfs_lookup_first_ordered_extent(src, off+len); |
1905 | if (!ordered && | |
1906 | !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len, | |
1907 | EXTENT_DELALLOC, 0, NULL)) | |
f46b5a66 | 1908 | break; |
c5c9cd4d | 1909 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
ae01a0ab YZ |
1910 | if (ordered) |
1911 | btrfs_put_ordered_extent(ordered); | |
9a019196 | 1912 | btrfs_wait_ordered_range(src, off, len); |
f46b5a66 CH |
1913 | } |
1914 | ||
c5c9cd4d | 1915 | /* clone data */ |
f46b5a66 | 1916 | key.objectid = src->i_ino; |
ae01a0ab YZ |
1917 | key.type = BTRFS_EXTENT_DATA_KEY; |
1918 | key.offset = 0; | |
f46b5a66 CH |
1919 | |
1920 | while (1) { | |
1921 | /* | |
1922 | * note the key will change type as we walk through the | |
1923 | * tree. | |
1924 | */ | |
a22285a6 | 1925 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
f46b5a66 CH |
1926 | if (ret < 0) |
1927 | goto out; | |
1928 | ||
ae01a0ab YZ |
1929 | nritems = btrfs_header_nritems(path->nodes[0]); |
1930 | if (path->slots[0] >= nritems) { | |
f46b5a66 CH |
1931 | ret = btrfs_next_leaf(root, path); |
1932 | if (ret < 0) | |
1933 | goto out; | |
1934 | if (ret > 0) | |
1935 | break; | |
ae01a0ab | 1936 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
1937 | } |
1938 | leaf = path->nodes[0]; | |
1939 | slot = path->slots[0]; | |
f46b5a66 | 1940 | |
ae01a0ab | 1941 | btrfs_item_key_to_cpu(leaf, &key, slot); |
d20f7043 | 1942 | if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || |
f46b5a66 CH |
1943 | key.objectid != src->i_ino) |
1944 | break; | |
1945 | ||
c5c9cd4d SW |
1946 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
1947 | struct btrfs_file_extent_item *extent; | |
1948 | int type; | |
31840ae1 ZY |
1949 | u32 size; |
1950 | struct btrfs_key new_key; | |
c5c9cd4d SW |
1951 | u64 disko = 0, diskl = 0; |
1952 | u64 datao = 0, datal = 0; | |
1953 | u8 comp; | |
b5384d48 | 1954 | u64 endoff; |
31840ae1 ZY |
1955 | |
1956 | size = btrfs_item_size_nr(leaf, slot); | |
1957 | read_extent_buffer(leaf, buf, | |
1958 | btrfs_item_ptr_offset(leaf, slot), | |
1959 | size); | |
c5c9cd4d SW |
1960 | |
1961 | extent = btrfs_item_ptr(leaf, slot, | |
1962 | struct btrfs_file_extent_item); | |
1963 | comp = btrfs_file_extent_compression(leaf, extent); | |
1964 | type = btrfs_file_extent_type(leaf, extent); | |
c8a894d7 CM |
1965 | if (type == BTRFS_FILE_EXTENT_REG || |
1966 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d397712b CM |
1967 | disko = btrfs_file_extent_disk_bytenr(leaf, |
1968 | extent); | |
1969 | diskl = btrfs_file_extent_disk_num_bytes(leaf, | |
1970 | extent); | |
c5c9cd4d | 1971 | datao = btrfs_file_extent_offset(leaf, extent); |
d397712b CM |
1972 | datal = btrfs_file_extent_num_bytes(leaf, |
1973 | extent); | |
c5c9cd4d SW |
1974 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
1975 | /* take upper bound, may be compressed */ | |
1976 | datal = btrfs_file_extent_ram_bytes(leaf, | |
1977 | extent); | |
1978 | } | |
31840ae1 ZY |
1979 | btrfs_release_path(root, path); |
1980 | ||
050006a7 | 1981 | if (key.offset + datal <= off || |
c5c9cd4d SW |
1982 | key.offset >= off+len) |
1983 | goto next; | |
1984 | ||
31840ae1 ZY |
1985 | memcpy(&new_key, &key, sizeof(new_key)); |
1986 | new_key.objectid = inode->i_ino; | |
4d728ec7 LZ |
1987 | if (off <= key.offset) |
1988 | new_key.offset = key.offset + destoff - off; | |
1989 | else | |
1990 | new_key.offset = destoff; | |
31840ae1 | 1991 | |
a22285a6 YZ |
1992 | trans = btrfs_start_transaction(root, 1); |
1993 | if (IS_ERR(trans)) { | |
1994 | ret = PTR_ERR(trans); | |
1995 | goto out; | |
1996 | } | |
1997 | ||
c8a894d7 CM |
1998 | if (type == BTRFS_FILE_EXTENT_REG || |
1999 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
a22285a6 YZ |
2000 | if (off > key.offset) { |
2001 | datao += off - key.offset; | |
2002 | datal -= off - key.offset; | |
2003 | } | |
2004 | ||
2005 | if (key.offset + datal > off + len) | |
2006 | datal = off + len - key.offset; | |
2007 | ||
2008 | ret = btrfs_drop_extents(trans, inode, | |
2009 | new_key.offset, | |
2010 | new_key.offset + datal, | |
2011 | &hint_byte, 1); | |
2012 | BUG_ON(ret); | |
2013 | ||
c5c9cd4d SW |
2014 | ret = btrfs_insert_empty_item(trans, root, path, |
2015 | &new_key, size); | |
a22285a6 | 2016 | BUG_ON(ret); |
c5c9cd4d SW |
2017 | |
2018 | leaf = path->nodes[0]; | |
2019 | slot = path->slots[0]; | |
2020 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
2021 | btrfs_item_ptr_offset(leaf, slot), |
2022 | size); | |
ae01a0ab | 2023 | |
c5c9cd4d | 2024 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 2025 | struct btrfs_file_extent_item); |
c5c9cd4d | 2026 | |
c5c9cd4d SW |
2027 | /* disko == 0 means it's a hole */ |
2028 | if (!disko) | |
2029 | datao = 0; | |
c5c9cd4d SW |
2030 | |
2031 | btrfs_set_file_extent_offset(leaf, extent, | |
2032 | datao); | |
2033 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
2034 | datal); | |
2035 | if (disko) { | |
2036 | inode_add_bytes(inode, datal); | |
ae01a0ab | 2037 | ret = btrfs_inc_extent_ref(trans, root, |
5d4f98a2 YZ |
2038 | disko, diskl, 0, |
2039 | root->root_key.objectid, | |
2040 | inode->i_ino, | |
2041 | new_key.offset - datao); | |
31840ae1 | 2042 | BUG_ON(ret); |
f46b5a66 | 2043 | } |
c5c9cd4d SW |
2044 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
2045 | u64 skip = 0; | |
2046 | u64 trim = 0; | |
2047 | if (off > key.offset) { | |
2048 | skip = off - key.offset; | |
2049 | new_key.offset += skip; | |
2050 | } | |
d397712b | 2051 | |
c5c9cd4d SW |
2052 | if (key.offset + datal > off+len) |
2053 | trim = key.offset + datal - (off+len); | |
d397712b | 2054 | |
c5c9cd4d | 2055 | if (comp && (skip || trim)) { |
c5c9cd4d | 2056 | ret = -EINVAL; |
a22285a6 | 2057 | btrfs_end_transaction(trans, root); |
c5c9cd4d SW |
2058 | goto out; |
2059 | } | |
2060 | size -= skip + trim; | |
2061 | datal -= skip + trim; | |
a22285a6 YZ |
2062 | |
2063 | ret = btrfs_drop_extents(trans, inode, | |
2064 | new_key.offset, | |
2065 | new_key.offset + datal, | |
2066 | &hint_byte, 1); | |
2067 | BUG_ON(ret); | |
2068 | ||
c5c9cd4d SW |
2069 | ret = btrfs_insert_empty_item(trans, root, path, |
2070 | &new_key, size); | |
a22285a6 | 2071 | BUG_ON(ret); |
c5c9cd4d SW |
2072 | |
2073 | if (skip) { | |
d397712b CM |
2074 | u32 start = |
2075 | btrfs_file_extent_calc_inline_size(0); | |
c5c9cd4d SW |
2076 | memmove(buf+start, buf+start+skip, |
2077 | datal); | |
2078 | } | |
2079 | ||
2080 | leaf = path->nodes[0]; | |
2081 | slot = path->slots[0]; | |
2082 | write_extent_buffer(leaf, buf, | |
2083 | btrfs_item_ptr_offset(leaf, slot), | |
2084 | size); | |
2085 | inode_add_bytes(inode, datal); | |
f46b5a66 | 2086 | } |
c5c9cd4d SW |
2087 | |
2088 | btrfs_mark_buffer_dirty(leaf); | |
a22285a6 | 2089 | btrfs_release_path(root, path); |
c5c9cd4d | 2090 | |
a22285a6 | 2091 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
b5384d48 SW |
2092 | |
2093 | /* | |
2094 | * we round up to the block size at eof when | |
2095 | * determining which extents to clone above, | |
2096 | * but shouldn't round up the file size | |
2097 | */ | |
2098 | endoff = new_key.offset + datal; | |
5f3888ff LZ |
2099 | if (endoff > destoff+olen) |
2100 | endoff = destoff+olen; | |
b5384d48 SW |
2101 | if (endoff > inode->i_size) |
2102 | btrfs_i_size_write(inode, endoff); | |
2103 | ||
a22285a6 YZ |
2104 | BTRFS_I(inode)->flags = BTRFS_I(src)->flags; |
2105 | ret = btrfs_update_inode(trans, root, inode); | |
2106 | BUG_ON(ret); | |
2107 | btrfs_end_transaction(trans, root); | |
2108 | } | |
d397712b | 2109 | next: |
31840ae1 | 2110 | btrfs_release_path(root, path); |
f46b5a66 | 2111 | key.offset++; |
f46b5a66 | 2112 | } |
f46b5a66 CH |
2113 | ret = 0; |
2114 | out: | |
ae01a0ab | 2115 | btrfs_release_path(root, path); |
c5c9cd4d | 2116 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
f46b5a66 CH |
2117 | out_unlock: |
2118 | mutex_unlock(&src->i_mutex); | |
2119 | mutex_unlock(&inode->i_mutex); | |
ae01a0ab YZ |
2120 | vfree(buf); |
2121 | btrfs_free_path(path); | |
f46b5a66 CH |
2122 | out_fput: |
2123 | fput(src_file); | |
ab67b7c1 YZ |
2124 | out_drop_write: |
2125 | mnt_drop_write(file->f_path.mnt); | |
f46b5a66 CH |
2126 | return ret; |
2127 | } | |
2128 | ||
7a865e8a | 2129 | static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) |
c5c9cd4d SW |
2130 | { |
2131 | struct btrfs_ioctl_clone_range_args args; | |
2132 | ||
7a865e8a | 2133 | if (copy_from_user(&args, argp, sizeof(args))) |
c5c9cd4d SW |
2134 | return -EFAULT; |
2135 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, | |
2136 | args.src_length, args.dest_offset); | |
2137 | } | |
2138 | ||
f46b5a66 CH |
2139 | /* |
2140 | * there are many ways the trans_start and trans_end ioctls can lead | |
2141 | * to deadlocks. They should only be used by applications that | |
2142 | * basically own the machine, and have a very in depth understanding | |
2143 | * of all the possible deadlocks and enospc problems. | |
2144 | */ | |
b2950863 | 2145 | static long btrfs_ioctl_trans_start(struct file *file) |
f46b5a66 CH |
2146 | { |
2147 | struct inode *inode = fdentry(file)->d_inode; | |
2148 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2149 | struct btrfs_trans_handle *trans; | |
1ab86aed | 2150 | int ret; |
f46b5a66 | 2151 | |
1ab86aed | 2152 | ret = -EPERM; |
df5b5520 | 2153 | if (!capable(CAP_SYS_ADMIN)) |
1ab86aed | 2154 | goto out; |
df5b5520 | 2155 | |
1ab86aed SW |
2156 | ret = -EINPROGRESS; |
2157 | if (file->private_data) | |
f46b5a66 | 2158 | goto out; |
9ca9ee09 | 2159 | |
b83cc969 LZ |
2160 | ret = -EROFS; |
2161 | if (btrfs_root_readonly(root)) | |
2162 | goto out; | |
2163 | ||
c146afad YZ |
2164 | ret = mnt_want_write(file->f_path.mnt); |
2165 | if (ret) | |
2166 | goto out; | |
2167 | ||
9ca9ee09 SW |
2168 | mutex_lock(&root->fs_info->trans_mutex); |
2169 | root->fs_info->open_ioctl_trans++; | |
2170 | mutex_unlock(&root->fs_info->trans_mutex); | |
2171 | ||
1ab86aed | 2172 | ret = -ENOMEM; |
9ca9ee09 | 2173 | trans = btrfs_start_ioctl_transaction(root, 0); |
abd30bb0 | 2174 | if (IS_ERR(trans)) |
1ab86aed SW |
2175 | goto out_drop; |
2176 | ||
2177 | file->private_data = trans; | |
2178 | return 0; | |
2179 | ||
2180 | out_drop: | |
2181 | mutex_lock(&root->fs_info->trans_mutex); | |
2182 | root->fs_info->open_ioctl_trans--; | |
2183 | mutex_unlock(&root->fs_info->trans_mutex); | |
2184 | mnt_drop_write(file->f_path.mnt); | |
f46b5a66 | 2185 | out: |
f46b5a66 CH |
2186 | return ret; |
2187 | } | |
2188 | ||
6ef5ed0d JB |
2189 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
2190 | { | |
2191 | struct inode *inode = fdentry(file)->d_inode; | |
2192 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2193 | struct btrfs_root *new_root; | |
2194 | struct btrfs_dir_item *di; | |
2195 | struct btrfs_trans_handle *trans; | |
2196 | struct btrfs_path *path; | |
2197 | struct btrfs_key location; | |
2198 | struct btrfs_disk_key disk_key; | |
2199 | struct btrfs_super_block *disk_super; | |
2200 | u64 features; | |
2201 | u64 objectid = 0; | |
2202 | u64 dir_id; | |
2203 | ||
2204 | if (!capable(CAP_SYS_ADMIN)) | |
2205 | return -EPERM; | |
2206 | ||
2207 | if (copy_from_user(&objectid, argp, sizeof(objectid))) | |
2208 | return -EFAULT; | |
2209 | ||
2210 | if (!objectid) | |
2211 | objectid = root->root_key.objectid; | |
2212 | ||
2213 | location.objectid = objectid; | |
2214 | location.type = BTRFS_ROOT_ITEM_KEY; | |
2215 | location.offset = (u64)-1; | |
2216 | ||
2217 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
2218 | if (IS_ERR(new_root)) | |
2219 | return PTR_ERR(new_root); | |
2220 | ||
2221 | if (btrfs_root_refs(&new_root->root_item) == 0) | |
2222 | return -ENOENT; | |
2223 | ||
2224 | path = btrfs_alloc_path(); | |
2225 | if (!path) | |
2226 | return -ENOMEM; | |
2227 | path->leave_spinning = 1; | |
2228 | ||
2229 | trans = btrfs_start_transaction(root, 1); | |
98d5dc13 | 2230 | if (IS_ERR(trans)) { |
6ef5ed0d | 2231 | btrfs_free_path(path); |
98d5dc13 | 2232 | return PTR_ERR(trans); |
6ef5ed0d JB |
2233 | } |
2234 | ||
2235 | dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); | |
2236 | di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, | |
2237 | dir_id, "default", 7, 1); | |
cf1e99a4 | 2238 | if (IS_ERR_OR_NULL(di)) { |
6ef5ed0d JB |
2239 | btrfs_free_path(path); |
2240 | btrfs_end_transaction(trans, root); | |
2241 | printk(KERN_ERR "Umm, you don't have the default dir item, " | |
2242 | "this isn't going to work\n"); | |
2243 | return -ENOENT; | |
2244 | } | |
2245 | ||
2246 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); | |
2247 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); | |
2248 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
2249 | btrfs_free_path(path); | |
2250 | ||
2251 | disk_super = &root->fs_info->super_copy; | |
2252 | features = btrfs_super_incompat_flags(disk_super); | |
2253 | if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { | |
2254 | features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; | |
2255 | btrfs_set_super_incompat_flags(disk_super, features); | |
2256 | } | |
2257 | btrfs_end_transaction(trans, root); | |
2258 | ||
2259 | return 0; | |
2260 | } | |
2261 | ||
bf5fc093 JB |
2262 | static void get_block_group_info(struct list_head *groups_list, |
2263 | struct btrfs_ioctl_space_info *space) | |
2264 | { | |
2265 | struct btrfs_block_group_cache *block_group; | |
2266 | ||
2267 | space->total_bytes = 0; | |
2268 | space->used_bytes = 0; | |
2269 | space->flags = 0; | |
2270 | list_for_each_entry(block_group, groups_list, list) { | |
2271 | space->flags = block_group->flags; | |
2272 | space->total_bytes += block_group->key.offset; | |
2273 | space->used_bytes += | |
2274 | btrfs_block_group_used(&block_group->item); | |
2275 | } | |
2276 | } | |
2277 | ||
1406e432 JB |
2278 | long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) |
2279 | { | |
2280 | struct btrfs_ioctl_space_args space_args; | |
2281 | struct btrfs_ioctl_space_info space; | |
2282 | struct btrfs_ioctl_space_info *dest; | |
7fde62bf CM |
2283 | struct btrfs_ioctl_space_info *dest_orig; |
2284 | struct btrfs_ioctl_space_info *user_dest; | |
1406e432 | 2285 | struct btrfs_space_info *info; |
bf5fc093 JB |
2286 | u64 types[] = {BTRFS_BLOCK_GROUP_DATA, |
2287 | BTRFS_BLOCK_GROUP_SYSTEM, | |
2288 | BTRFS_BLOCK_GROUP_METADATA, | |
2289 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; | |
2290 | int num_types = 4; | |
7fde62bf | 2291 | int alloc_size; |
1406e432 | 2292 | int ret = 0; |
51788b1b | 2293 | u64 slot_count = 0; |
bf5fc093 | 2294 | int i, c; |
1406e432 JB |
2295 | |
2296 | if (copy_from_user(&space_args, | |
2297 | (struct btrfs_ioctl_space_args __user *)arg, | |
2298 | sizeof(space_args))) | |
2299 | return -EFAULT; | |
2300 | ||
bf5fc093 JB |
2301 | for (i = 0; i < num_types; i++) { |
2302 | struct btrfs_space_info *tmp; | |
2303 | ||
2304 | info = NULL; | |
2305 | rcu_read_lock(); | |
2306 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
2307 | list) { | |
2308 | if (tmp->flags == types[i]) { | |
2309 | info = tmp; | |
2310 | break; | |
2311 | } | |
2312 | } | |
2313 | rcu_read_unlock(); | |
2314 | ||
2315 | if (!info) | |
2316 | continue; | |
2317 | ||
2318 | down_read(&info->groups_sem); | |
2319 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
2320 | if (!list_empty(&info->block_groups[c])) | |
2321 | slot_count++; | |
2322 | } | |
2323 | up_read(&info->groups_sem); | |
2324 | } | |
7fde62bf CM |
2325 | |
2326 | /* space_slots == 0 means they are asking for a count */ | |
2327 | if (space_args.space_slots == 0) { | |
2328 | space_args.total_spaces = slot_count; | |
2329 | goto out; | |
2330 | } | |
bf5fc093 | 2331 | |
51788b1b | 2332 | slot_count = min_t(u64, space_args.space_slots, slot_count); |
bf5fc093 | 2333 | |
7fde62bf | 2334 | alloc_size = sizeof(*dest) * slot_count; |
bf5fc093 | 2335 | |
7fde62bf CM |
2336 | /* we generally have at most 6 or so space infos, one for each raid |
2337 | * level. So, a whole page should be more than enough for everyone | |
2338 | */ | |
2339 | if (alloc_size > PAGE_CACHE_SIZE) | |
2340 | return -ENOMEM; | |
2341 | ||
1406e432 | 2342 | space_args.total_spaces = 0; |
7fde62bf CM |
2343 | dest = kmalloc(alloc_size, GFP_NOFS); |
2344 | if (!dest) | |
2345 | return -ENOMEM; | |
2346 | dest_orig = dest; | |
1406e432 | 2347 | |
7fde62bf | 2348 | /* now we have a buffer to copy into */ |
bf5fc093 JB |
2349 | for (i = 0; i < num_types; i++) { |
2350 | struct btrfs_space_info *tmp; | |
2351 | ||
51788b1b DR |
2352 | if (!slot_count) |
2353 | break; | |
2354 | ||
bf5fc093 JB |
2355 | info = NULL; |
2356 | rcu_read_lock(); | |
2357 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
2358 | list) { | |
2359 | if (tmp->flags == types[i]) { | |
2360 | info = tmp; | |
2361 | break; | |
2362 | } | |
2363 | } | |
2364 | rcu_read_unlock(); | |
7fde62bf | 2365 | |
bf5fc093 JB |
2366 | if (!info) |
2367 | continue; | |
2368 | down_read(&info->groups_sem); | |
2369 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
2370 | if (!list_empty(&info->block_groups[c])) { | |
2371 | get_block_group_info(&info->block_groups[c], | |
2372 | &space); | |
2373 | memcpy(dest, &space, sizeof(space)); | |
2374 | dest++; | |
2375 | space_args.total_spaces++; | |
51788b1b | 2376 | slot_count--; |
bf5fc093 | 2377 | } |
51788b1b DR |
2378 | if (!slot_count) |
2379 | break; | |
bf5fc093 JB |
2380 | } |
2381 | up_read(&info->groups_sem); | |
1406e432 | 2382 | } |
1406e432 | 2383 | |
7fde62bf CM |
2384 | user_dest = (struct btrfs_ioctl_space_info *) |
2385 | (arg + sizeof(struct btrfs_ioctl_space_args)); | |
2386 | ||
2387 | if (copy_to_user(user_dest, dest_orig, alloc_size)) | |
2388 | ret = -EFAULT; | |
2389 | ||
2390 | kfree(dest_orig); | |
2391 | out: | |
2392 | if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) | |
1406e432 JB |
2393 | ret = -EFAULT; |
2394 | ||
2395 | return ret; | |
2396 | } | |
2397 | ||
f46b5a66 CH |
2398 | /* |
2399 | * there are many ways the trans_start and trans_end ioctls can lead | |
2400 | * to deadlocks. They should only be used by applications that | |
2401 | * basically own the machine, and have a very in depth understanding | |
2402 | * of all the possible deadlocks and enospc problems. | |
2403 | */ | |
2404 | long btrfs_ioctl_trans_end(struct file *file) | |
2405 | { | |
2406 | struct inode *inode = fdentry(file)->d_inode; | |
2407 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2408 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 2409 | |
f46b5a66 | 2410 | trans = file->private_data; |
1ab86aed SW |
2411 | if (!trans) |
2412 | return -EINVAL; | |
b214107e | 2413 | file->private_data = NULL; |
9ca9ee09 | 2414 | |
1ab86aed SW |
2415 | btrfs_end_transaction(trans, root); |
2416 | ||
9ca9ee09 SW |
2417 | mutex_lock(&root->fs_info->trans_mutex); |
2418 | root->fs_info->open_ioctl_trans--; | |
2419 | mutex_unlock(&root->fs_info->trans_mutex); | |
2420 | ||
cfc8ea87 | 2421 | mnt_drop_write(file->f_path.mnt); |
1ab86aed | 2422 | return 0; |
f46b5a66 CH |
2423 | } |
2424 | ||
46204592 SW |
2425 | static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) |
2426 | { | |
2427 | struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; | |
2428 | struct btrfs_trans_handle *trans; | |
2429 | u64 transid; | |
db5b493a | 2430 | int ret; |
46204592 SW |
2431 | |
2432 | trans = btrfs_start_transaction(root, 0); | |
98d5dc13 TI |
2433 | if (IS_ERR(trans)) |
2434 | return PTR_ERR(trans); | |
46204592 | 2435 | transid = trans->transid; |
db5b493a TI |
2436 | ret = btrfs_commit_transaction_async(trans, root, 0); |
2437 | if (ret) | |
2438 | return ret; | |
46204592 SW |
2439 | |
2440 | if (argp) | |
2441 | if (copy_to_user(argp, &transid, sizeof(transid))) | |
2442 | return -EFAULT; | |
2443 | return 0; | |
2444 | } | |
2445 | ||
2446 | static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) | |
2447 | { | |
2448 | struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; | |
2449 | u64 transid; | |
2450 | ||
2451 | if (argp) { | |
2452 | if (copy_from_user(&transid, argp, sizeof(transid))) | |
2453 | return -EFAULT; | |
2454 | } else { | |
2455 | transid = 0; /* current trans */ | |
2456 | } | |
2457 | return btrfs_wait_for_commit(root, transid); | |
2458 | } | |
2459 | ||
f46b5a66 CH |
2460 | long btrfs_ioctl(struct file *file, unsigned int |
2461 | cmd, unsigned long arg) | |
2462 | { | |
2463 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; | |
4bcabaa3 | 2464 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
2465 | |
2466 | switch (cmd) { | |
6cbff00f CH |
2467 | case FS_IOC_GETFLAGS: |
2468 | return btrfs_ioctl_getflags(file, argp); | |
2469 | case FS_IOC_SETFLAGS: | |
2470 | return btrfs_ioctl_setflags(file, argp); | |
2471 | case FS_IOC_GETVERSION: | |
2472 | return btrfs_ioctl_getversion(file, argp); | |
f7039b1d LD |
2473 | case FITRIM: |
2474 | return btrfs_ioctl_fitrim(file, argp); | |
f46b5a66 | 2475 | case BTRFS_IOC_SNAP_CREATE: |
fa0d2b9b | 2476 | return btrfs_ioctl_snap_create(file, argp, 0); |
fdfb1e4f | 2477 | case BTRFS_IOC_SNAP_CREATE_V2: |
fa0d2b9b | 2478 | return btrfs_ioctl_snap_create_v2(file, argp, 0); |
3de4586c | 2479 | case BTRFS_IOC_SUBVOL_CREATE: |
fa0d2b9b | 2480 | return btrfs_ioctl_snap_create(file, argp, 1); |
76dda93c YZ |
2481 | case BTRFS_IOC_SNAP_DESTROY: |
2482 | return btrfs_ioctl_snap_destroy(file, argp); | |
0caa102d LZ |
2483 | case BTRFS_IOC_SUBVOL_GETFLAGS: |
2484 | return btrfs_ioctl_subvol_getflags(file, argp); | |
2485 | case BTRFS_IOC_SUBVOL_SETFLAGS: | |
2486 | return btrfs_ioctl_subvol_setflags(file, argp); | |
6ef5ed0d JB |
2487 | case BTRFS_IOC_DEFAULT_SUBVOL: |
2488 | return btrfs_ioctl_default_subvol(file, argp); | |
f46b5a66 | 2489 | case BTRFS_IOC_DEFRAG: |
1e701a32 CM |
2490 | return btrfs_ioctl_defrag(file, NULL); |
2491 | case BTRFS_IOC_DEFRAG_RANGE: | |
2492 | return btrfs_ioctl_defrag(file, argp); | |
f46b5a66 | 2493 | case BTRFS_IOC_RESIZE: |
4bcabaa3 | 2494 | return btrfs_ioctl_resize(root, argp); |
f46b5a66 | 2495 | case BTRFS_IOC_ADD_DEV: |
4bcabaa3 | 2496 | return btrfs_ioctl_add_dev(root, argp); |
f46b5a66 | 2497 | case BTRFS_IOC_RM_DEV: |
4bcabaa3 | 2498 | return btrfs_ioctl_rm_dev(root, argp); |
f46b5a66 CH |
2499 | case BTRFS_IOC_BALANCE: |
2500 | return btrfs_balance(root->fs_info->dev_root); | |
2501 | case BTRFS_IOC_CLONE: | |
c5c9cd4d SW |
2502 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
2503 | case BTRFS_IOC_CLONE_RANGE: | |
7a865e8a | 2504 | return btrfs_ioctl_clone_range(file, argp); |
f46b5a66 CH |
2505 | case BTRFS_IOC_TRANS_START: |
2506 | return btrfs_ioctl_trans_start(file); | |
2507 | case BTRFS_IOC_TRANS_END: | |
2508 | return btrfs_ioctl_trans_end(file); | |
ac8e9819 CM |
2509 | case BTRFS_IOC_TREE_SEARCH: |
2510 | return btrfs_ioctl_tree_search(file, argp); | |
2511 | case BTRFS_IOC_INO_LOOKUP: | |
2512 | return btrfs_ioctl_ino_lookup(file, argp); | |
1406e432 JB |
2513 | case BTRFS_IOC_SPACE_INFO: |
2514 | return btrfs_ioctl_space_info(root, argp); | |
f46b5a66 CH |
2515 | case BTRFS_IOC_SYNC: |
2516 | btrfs_sync_fs(file->f_dentry->d_sb, 1); | |
2517 | return 0; | |
46204592 SW |
2518 | case BTRFS_IOC_START_SYNC: |
2519 | return btrfs_ioctl_start_sync(file, argp); | |
2520 | case BTRFS_IOC_WAIT_SYNC: | |
2521 | return btrfs_ioctl_wait_sync(file, argp); | |
f46b5a66 CH |
2522 | } |
2523 | ||
2524 | return -ENOTTY; | |
2525 | } |