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> |
4b4e25f2 | 43 | #include "compat.h" |
f46b5a66 CH |
44 | #include "ctree.h" |
45 | #include "disk-io.h" | |
46 | #include "transaction.h" | |
47 | #include "btrfs_inode.h" | |
48 | #include "ioctl.h" | |
49 | #include "print-tree.h" | |
50 | #include "volumes.h" | |
925baedd | 51 | #include "locking.h" |
f46b5a66 | 52 | |
6cbff00f CH |
53 | /* Mask out flags that are inappropriate for the given type of inode. */ |
54 | static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) | |
55 | { | |
56 | if (S_ISDIR(mode)) | |
57 | return flags; | |
58 | else if (S_ISREG(mode)) | |
59 | return flags & ~FS_DIRSYNC_FL; | |
60 | else | |
61 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); | |
62 | } | |
63 | ||
64 | /* | |
65 | * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. | |
66 | */ | |
67 | static unsigned int btrfs_flags_to_ioctl(unsigned int flags) | |
68 | { | |
69 | unsigned int iflags = 0; | |
70 | ||
71 | if (flags & BTRFS_INODE_SYNC) | |
72 | iflags |= FS_SYNC_FL; | |
73 | if (flags & BTRFS_INODE_IMMUTABLE) | |
74 | iflags |= FS_IMMUTABLE_FL; | |
75 | if (flags & BTRFS_INODE_APPEND) | |
76 | iflags |= FS_APPEND_FL; | |
77 | if (flags & BTRFS_INODE_NODUMP) | |
78 | iflags |= FS_NODUMP_FL; | |
79 | if (flags & BTRFS_INODE_NOATIME) | |
80 | iflags |= FS_NOATIME_FL; | |
81 | if (flags & BTRFS_INODE_DIRSYNC) | |
82 | iflags |= FS_DIRSYNC_FL; | |
83 | ||
84 | return iflags; | |
85 | } | |
86 | ||
87 | /* | |
88 | * Update inode->i_flags based on the btrfs internal flags. | |
89 | */ | |
90 | void btrfs_update_iflags(struct inode *inode) | |
91 | { | |
92 | struct btrfs_inode *ip = BTRFS_I(inode); | |
93 | ||
94 | inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
95 | ||
96 | if (ip->flags & BTRFS_INODE_SYNC) | |
97 | inode->i_flags |= S_SYNC; | |
98 | if (ip->flags & BTRFS_INODE_IMMUTABLE) | |
99 | inode->i_flags |= S_IMMUTABLE; | |
100 | if (ip->flags & BTRFS_INODE_APPEND) | |
101 | inode->i_flags |= S_APPEND; | |
102 | if (ip->flags & BTRFS_INODE_NOATIME) | |
103 | inode->i_flags |= S_NOATIME; | |
104 | if (ip->flags & BTRFS_INODE_DIRSYNC) | |
105 | inode->i_flags |= S_DIRSYNC; | |
106 | } | |
107 | ||
108 | /* | |
109 | * Inherit flags from the parent inode. | |
110 | * | |
111 | * Unlike extN we don't have any flags we don't want to inherit currently. | |
112 | */ | |
113 | void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) | |
114 | { | |
0b4dcea5 CM |
115 | unsigned int flags; |
116 | ||
117 | if (!dir) | |
118 | return; | |
119 | ||
120 | flags = BTRFS_I(dir)->flags; | |
6cbff00f CH |
121 | |
122 | if (S_ISREG(inode->i_mode)) | |
123 | flags &= ~BTRFS_INODE_DIRSYNC; | |
124 | else if (!S_ISDIR(inode->i_mode)) | |
125 | flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME); | |
126 | ||
127 | BTRFS_I(inode)->flags = flags; | |
128 | btrfs_update_iflags(inode); | |
129 | } | |
130 | ||
131 | static int btrfs_ioctl_getflags(struct file *file, void __user *arg) | |
132 | { | |
133 | struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); | |
134 | unsigned int flags = btrfs_flags_to_ioctl(ip->flags); | |
135 | ||
136 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
137 | return -EFAULT; | |
138 | return 0; | |
139 | } | |
140 | ||
141 | static int btrfs_ioctl_setflags(struct file *file, void __user *arg) | |
142 | { | |
143 | struct inode *inode = file->f_path.dentry->d_inode; | |
144 | struct btrfs_inode *ip = BTRFS_I(inode); | |
145 | struct btrfs_root *root = ip->root; | |
146 | struct btrfs_trans_handle *trans; | |
147 | unsigned int flags, oldflags; | |
148 | int ret; | |
149 | ||
150 | if (copy_from_user(&flags, arg, sizeof(flags))) | |
151 | return -EFAULT; | |
152 | ||
153 | if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ | |
154 | FS_NOATIME_FL | FS_NODUMP_FL | \ | |
155 | FS_SYNC_FL | FS_DIRSYNC_FL)) | |
156 | return -EOPNOTSUPP; | |
f46b5a66 | 157 | |
6cbff00f CH |
158 | if (!is_owner_or_cap(inode)) |
159 | return -EACCES; | |
160 | ||
161 | mutex_lock(&inode->i_mutex); | |
162 | ||
163 | flags = btrfs_mask_flags(inode->i_mode, flags); | |
164 | oldflags = btrfs_flags_to_ioctl(ip->flags); | |
165 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { | |
166 | if (!capable(CAP_LINUX_IMMUTABLE)) { | |
167 | ret = -EPERM; | |
168 | goto out_unlock; | |
169 | } | |
170 | } | |
171 | ||
172 | ret = mnt_want_write(file->f_path.mnt); | |
173 | if (ret) | |
174 | goto out_unlock; | |
175 | ||
176 | if (flags & FS_SYNC_FL) | |
177 | ip->flags |= BTRFS_INODE_SYNC; | |
178 | else | |
179 | ip->flags &= ~BTRFS_INODE_SYNC; | |
180 | if (flags & FS_IMMUTABLE_FL) | |
181 | ip->flags |= BTRFS_INODE_IMMUTABLE; | |
182 | else | |
183 | ip->flags &= ~BTRFS_INODE_IMMUTABLE; | |
184 | if (flags & FS_APPEND_FL) | |
185 | ip->flags |= BTRFS_INODE_APPEND; | |
186 | else | |
187 | ip->flags &= ~BTRFS_INODE_APPEND; | |
188 | if (flags & FS_NODUMP_FL) | |
189 | ip->flags |= BTRFS_INODE_NODUMP; | |
190 | else | |
191 | ip->flags &= ~BTRFS_INODE_NODUMP; | |
192 | if (flags & FS_NOATIME_FL) | |
193 | ip->flags |= BTRFS_INODE_NOATIME; | |
194 | else | |
195 | ip->flags &= ~BTRFS_INODE_NOATIME; | |
196 | if (flags & FS_DIRSYNC_FL) | |
197 | ip->flags |= BTRFS_INODE_DIRSYNC; | |
198 | else | |
199 | ip->flags &= ~BTRFS_INODE_DIRSYNC; | |
200 | ||
201 | ||
202 | trans = btrfs_join_transaction(root, 1); | |
203 | BUG_ON(!trans); | |
204 | ||
205 | ret = btrfs_update_inode(trans, root, inode); | |
206 | BUG_ON(ret); | |
207 | ||
208 | btrfs_update_iflags(inode); | |
209 | inode->i_ctime = CURRENT_TIME; | |
210 | btrfs_end_transaction(trans, root); | |
211 | ||
212 | mnt_drop_write(file->f_path.mnt); | |
213 | out_unlock: | |
214 | mutex_unlock(&inode->i_mutex); | |
215 | return 0; | |
216 | } | |
217 | ||
218 | static int btrfs_ioctl_getversion(struct file *file, int __user *arg) | |
219 | { | |
220 | struct inode *inode = file->f_path.dentry->d_inode; | |
221 | ||
222 | return put_user(inode->i_generation, arg); | |
223 | } | |
f46b5a66 | 224 | |
cb8e7090 CH |
225 | static noinline int create_subvol(struct btrfs_root *root, |
226 | struct dentry *dentry, | |
227 | char *name, int namelen) | |
f46b5a66 CH |
228 | { |
229 | struct btrfs_trans_handle *trans; | |
230 | struct btrfs_key key; | |
231 | struct btrfs_root_item root_item; | |
232 | struct btrfs_inode_item *inode_item; | |
233 | struct extent_buffer *leaf; | |
76dda93c YZ |
234 | struct btrfs_root *new_root; |
235 | struct inode *dir = dentry->d_parent->d_inode; | |
f46b5a66 CH |
236 | int ret; |
237 | int err; | |
238 | u64 objectid; | |
239 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
3de4586c | 240 | u64 index = 0; |
f46b5a66 | 241 | |
a22285a6 YZ |
242 | ret = btrfs_find_free_objectid(NULL, root->fs_info->tree_root, |
243 | 0, &objectid); | |
244 | if (ret) | |
245 | return ret; | |
9ed74f2d JB |
246 | /* |
247 | * 1 - inode item | |
248 | * 2 - refs | |
249 | * 1 - root item | |
250 | * 2 - dir items | |
251 | */ | |
a22285a6 YZ |
252 | trans = btrfs_start_transaction(root, 6); |
253 | if (IS_ERR(trans)) | |
254 | return PTR_ERR(trans); | |
f46b5a66 | 255 | |
5d4f98a2 YZ |
256 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, |
257 | 0, objectid, NULL, 0, 0, 0); | |
8e8a1e31 JB |
258 | if (IS_ERR(leaf)) { |
259 | ret = PTR_ERR(leaf); | |
260 | goto fail; | |
261 | } | |
f46b5a66 | 262 | |
5d4f98a2 | 263 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
f46b5a66 CH |
264 | btrfs_set_header_bytenr(leaf, leaf->start); |
265 | btrfs_set_header_generation(leaf, trans->transid); | |
5d4f98a2 | 266 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); |
f46b5a66 CH |
267 | btrfs_set_header_owner(leaf, objectid); |
268 | ||
269 | write_extent_buffer(leaf, root->fs_info->fsid, | |
270 | (unsigned long)btrfs_header_fsid(leaf), | |
271 | BTRFS_FSID_SIZE); | |
5d4f98a2 YZ |
272 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, |
273 | (unsigned long)btrfs_header_chunk_tree_uuid(leaf), | |
274 | BTRFS_UUID_SIZE); | |
f46b5a66 CH |
275 | btrfs_mark_buffer_dirty(leaf); |
276 | ||
277 | inode_item = &root_item.inode; | |
278 | memset(inode_item, 0, sizeof(*inode_item)); | |
279 | inode_item->generation = cpu_to_le64(1); | |
280 | inode_item->size = cpu_to_le64(3); | |
281 | inode_item->nlink = cpu_to_le32(1); | |
a76a3cd4 | 282 | inode_item->nbytes = cpu_to_le64(root->leafsize); |
f46b5a66 CH |
283 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); |
284 | ||
285 | btrfs_set_root_bytenr(&root_item, leaf->start); | |
84234f3a | 286 | btrfs_set_root_generation(&root_item, trans->transid); |
f46b5a66 CH |
287 | btrfs_set_root_level(&root_item, 0); |
288 | btrfs_set_root_refs(&root_item, 1); | |
86b9f2ec | 289 | btrfs_set_root_used(&root_item, leaf->len); |
80ff3856 | 290 | btrfs_set_root_last_snapshot(&root_item, 0); |
f46b5a66 CH |
291 | |
292 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); | |
293 | root_item.drop_level = 0; | |
294 | ||
925baedd | 295 | btrfs_tree_unlock(leaf); |
f46b5a66 CH |
296 | free_extent_buffer(leaf); |
297 | leaf = NULL; | |
298 | ||
299 | btrfs_set_root_dirid(&root_item, new_dirid); | |
300 | ||
301 | key.objectid = objectid; | |
5d4f98a2 | 302 | key.offset = 0; |
f46b5a66 CH |
303 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
304 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
305 | &root_item); | |
306 | if (ret) | |
307 | goto fail; | |
308 | ||
76dda93c YZ |
309 | key.offset = (u64)-1; |
310 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); | |
311 | BUG_ON(IS_ERR(new_root)); | |
312 | ||
313 | btrfs_record_root_in_trans(trans, new_root); | |
314 | ||
315 | ret = btrfs_create_subvol_root(trans, new_root, new_dirid, | |
316 | BTRFS_I(dir)->block_group); | |
f46b5a66 CH |
317 | /* |
318 | * insert the directory item | |
319 | */ | |
3de4586c CM |
320 | ret = btrfs_set_inode_index(dir, &index); |
321 | BUG_ON(ret); | |
322 | ||
323 | ret = btrfs_insert_dir_item(trans, root, | |
f46b5a66 | 324 | name, namelen, dir->i_ino, &key, |
3de4586c | 325 | BTRFS_FT_DIR, index); |
f46b5a66 CH |
326 | if (ret) |
327 | goto fail; | |
0660b5af | 328 | |
52c26179 YZ |
329 | btrfs_i_size_write(dir, dir->i_size + namelen * 2); |
330 | ret = btrfs_update_inode(trans, root, dir); | |
331 | BUG_ON(ret); | |
332 | ||
0660b5af | 333 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
4df27c4d | 334 | objectid, root->root_key.objectid, |
0660b5af | 335 | dir->i_ino, index, name, namelen); |
0660b5af | 336 | |
76dda93c | 337 | BUG_ON(ret); |
f46b5a66 | 338 | |
76dda93c | 339 | d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); |
f46b5a66 | 340 | fail: |
76dda93c | 341 | err = btrfs_commit_transaction(trans, root); |
f46b5a66 CH |
342 | if (err && !ret) |
343 | ret = err; | |
f46b5a66 CH |
344 | return ret; |
345 | } | |
346 | ||
a22285a6 | 347 | static int create_snapshot(struct btrfs_root *root, struct dentry *dentry) |
f46b5a66 | 348 | { |
2e4bfab9 | 349 | struct inode *inode; |
f46b5a66 CH |
350 | struct btrfs_pending_snapshot *pending_snapshot; |
351 | struct btrfs_trans_handle *trans; | |
2e4bfab9 | 352 | int ret; |
f46b5a66 CH |
353 | |
354 | if (!root->ref_cows) | |
355 | return -EINVAL; | |
356 | ||
3de4586c | 357 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
a22285a6 YZ |
358 | if (!pending_snapshot) |
359 | return -ENOMEM; | |
360 | ||
361 | btrfs_init_block_rsv(&pending_snapshot->block_rsv); | |
3de4586c | 362 | pending_snapshot->dentry = dentry; |
f46b5a66 | 363 | pending_snapshot->root = root; |
a22285a6 YZ |
364 | |
365 | trans = btrfs_start_transaction(root->fs_info->extent_root, 5); | |
366 | if (IS_ERR(trans)) { | |
367 | ret = PTR_ERR(trans); | |
368 | goto fail; | |
369 | } | |
370 | ||
371 | ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); | |
372 | BUG_ON(ret); | |
373 | ||
f46b5a66 CH |
374 | list_add(&pending_snapshot->list, |
375 | &trans->transaction->pending_snapshots); | |
a22285a6 | 376 | ret = btrfs_commit_transaction(trans, root->fs_info->extent_root); |
2e4bfab9 | 377 | BUG_ON(ret); |
a22285a6 YZ |
378 | |
379 | ret = pending_snapshot->error; | |
380 | if (ret) | |
381 | goto fail; | |
382 | ||
383 | btrfs_orphan_cleanup(pending_snapshot->snap); | |
f46b5a66 | 384 | |
2e4bfab9 YZ |
385 | inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); |
386 | if (IS_ERR(inode)) { | |
387 | ret = PTR_ERR(inode); | |
388 | goto fail; | |
389 | } | |
390 | BUG_ON(!inode); | |
391 | d_instantiate(dentry, inode); | |
392 | ret = 0; | |
393 | fail: | |
a22285a6 | 394 | kfree(pending_snapshot); |
f46b5a66 CH |
395 | return ret; |
396 | } | |
397 | ||
cb8e7090 CH |
398 | /* copy of may_create in fs/namei.c() */ |
399 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
400 | { | |
401 | if (child->d_inode) | |
402 | return -EEXIST; | |
403 | if (IS_DEADDIR(dir)) | |
404 | return -ENOENT; | |
405 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
406 | } | |
407 | ||
408 | /* | |
409 | * Create a new subvolume below @parent. This is largely modeled after | |
410 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
411 | * inside this filesystem so it's quite a bit simpler. | |
412 | */ | |
76dda93c YZ |
413 | static noinline int btrfs_mksubvol(struct path *parent, |
414 | char *name, int namelen, | |
3de4586c | 415 | struct btrfs_root *snap_src) |
cb8e7090 | 416 | { |
76dda93c | 417 | struct inode *dir = parent->dentry->d_inode; |
cb8e7090 CH |
418 | struct dentry *dentry; |
419 | int error; | |
420 | ||
76dda93c | 421 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
cb8e7090 CH |
422 | |
423 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
424 | error = PTR_ERR(dentry); | |
425 | if (IS_ERR(dentry)) | |
426 | goto out_unlock; | |
427 | ||
428 | error = -EEXIST; | |
429 | if (dentry->d_inode) | |
430 | goto out_dput; | |
431 | ||
cb8e7090 CH |
432 | error = mnt_want_write(parent->mnt); |
433 | if (error) | |
434 | goto out_dput; | |
435 | ||
76dda93c | 436 | error = btrfs_may_create(dir, dentry); |
cb8e7090 CH |
437 | if (error) |
438 | goto out_drop_write; | |
439 | ||
76dda93c YZ |
440 | down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); |
441 | ||
442 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) | |
443 | goto out_up_read; | |
444 | ||
3de4586c | 445 | if (snap_src) { |
a22285a6 | 446 | error = create_snapshot(snap_src, dentry); |
3de4586c | 447 | } else { |
76dda93c YZ |
448 | error = create_subvol(BTRFS_I(dir)->root, dentry, |
449 | name, namelen); | |
3de4586c | 450 | } |
76dda93c YZ |
451 | if (!error) |
452 | fsnotify_mkdir(dir, dentry); | |
453 | out_up_read: | |
454 | up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); | |
cb8e7090 CH |
455 | out_drop_write: |
456 | mnt_drop_write(parent->mnt); | |
457 | out_dput: | |
458 | dput(dentry); | |
459 | out_unlock: | |
76dda93c | 460 | mutex_unlock(&dir->i_mutex); |
cb8e7090 CH |
461 | return error; |
462 | } | |
463 | ||
940100a4 | 464 | static int should_defrag_range(struct inode *inode, u64 start, u64 len, |
1e701a32 CM |
465 | int thresh, u64 *last_len, u64 *skip, |
466 | u64 *defrag_end) | |
940100a4 CM |
467 | { |
468 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
469 | struct extent_map *em = NULL; | |
470 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
471 | int ret = 1; | |
472 | ||
1e701a32 CM |
473 | |
474 | if (thresh == 0) | |
475 | thresh = 256 * 1024; | |
476 | ||
940100a4 CM |
477 | /* |
478 | * make sure that once we start defragging and extent, we keep on | |
479 | * defragging it | |
480 | */ | |
481 | if (start < *defrag_end) | |
482 | return 1; | |
483 | ||
484 | *skip = 0; | |
485 | ||
486 | /* | |
487 | * hopefully we have this extent in the tree already, try without | |
488 | * the full extent lock | |
489 | */ | |
490 | read_lock(&em_tree->lock); | |
491 | em = lookup_extent_mapping(em_tree, start, len); | |
492 | read_unlock(&em_tree->lock); | |
493 | ||
494 | if (!em) { | |
495 | /* get the big lock and read metadata off disk */ | |
496 | lock_extent(io_tree, start, start + len - 1, GFP_NOFS); | |
497 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); | |
498 | unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); | |
499 | ||
6cf8bfbf | 500 | if (IS_ERR(em)) |
940100a4 CM |
501 | return 0; |
502 | } | |
503 | ||
504 | /* this will cover holes, and inline extents */ | |
505 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) | |
506 | ret = 0; | |
507 | ||
508 | /* | |
509 | * we hit a real extent, if it is big don't bother defragging it again | |
510 | */ | |
1e701a32 | 511 | if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) |
940100a4 CM |
512 | ret = 0; |
513 | ||
514 | /* | |
515 | * last_len ends up being a counter of how many bytes we've defragged. | |
516 | * every time we choose not to defrag an extent, we reset *last_len | |
517 | * so that the next tiny extent will force a defrag. | |
518 | * | |
519 | * The end result of this is that tiny extents before a single big | |
520 | * extent will force at least part of that big extent to be defragged. | |
521 | */ | |
522 | if (ret) { | |
523 | *last_len += len; | |
524 | *defrag_end = extent_map_end(em); | |
525 | } else { | |
526 | *last_len = 0; | |
527 | *skip = extent_map_end(em); | |
528 | *defrag_end = 0; | |
529 | } | |
530 | ||
531 | free_extent_map(em); | |
532 | return ret; | |
533 | } | |
534 | ||
1e701a32 CM |
535 | static int btrfs_defrag_file(struct file *file, |
536 | struct btrfs_ioctl_defrag_range_args *range) | |
f46b5a66 CH |
537 | { |
538 | struct inode *inode = fdentry(file)->d_inode; | |
539 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
540 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
3eaa2885 | 541 | struct btrfs_ordered_extent *ordered; |
f46b5a66 CH |
542 | struct page *page; |
543 | unsigned long last_index; | |
544 | unsigned long ra_pages = root->fs_info->bdi.ra_pages; | |
545 | unsigned long total_read = 0; | |
546 | u64 page_start; | |
547 | u64 page_end; | |
940100a4 CM |
548 | u64 last_len = 0; |
549 | u64 skip = 0; | |
550 | u64 defrag_end = 0; | |
f46b5a66 CH |
551 | unsigned long i; |
552 | int ret; | |
553 | ||
940100a4 CM |
554 | if (inode->i_size == 0) |
555 | return 0; | |
556 | ||
1e701a32 CM |
557 | if (range->start + range->len > range->start) { |
558 | last_index = min_t(u64, inode->i_size - 1, | |
559 | range->start + range->len - 1) >> PAGE_CACHE_SHIFT; | |
560 | } else { | |
561 | last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; | |
562 | } | |
563 | ||
564 | i = range->start >> PAGE_CACHE_SHIFT; | |
940100a4 CM |
565 | while (i <= last_index) { |
566 | if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, | |
1e701a32 CM |
567 | PAGE_CACHE_SIZE, |
568 | range->extent_thresh, | |
569 | &last_len, &skip, | |
940100a4 CM |
570 | &defrag_end)) { |
571 | unsigned long next; | |
572 | /* | |
573 | * the should_defrag function tells us how much to skip | |
574 | * bump our counter by the suggested amount | |
575 | */ | |
576 | next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
577 | i = max(i + 1, next); | |
578 | continue; | |
579 | } | |
f46b5a66 | 580 | |
f46b5a66 CH |
581 | if (total_read % ra_pages == 0) { |
582 | btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, | |
583 | min(last_index, i + ra_pages - 1)); | |
584 | } | |
585 | total_read++; | |
940100a4 | 586 | mutex_lock(&inode->i_mutex); |
1e701a32 CM |
587 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) |
588 | BTRFS_I(inode)->force_compress = 1; | |
940100a4 | 589 | |
0ca1f7ce YZ |
590 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
591 | if (ret) | |
592 | goto err_unlock; | |
3eaa2885 | 593 | again: |
940100a4 CM |
594 | if (inode->i_size == 0 || |
595 | i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) { | |
596 | ret = 0; | |
597 | goto err_reservations; | |
598 | } | |
599 | ||
f46b5a66 | 600 | page = grab_cache_page(inode->i_mapping, i); |
0ca1f7ce YZ |
601 | if (!page) { |
602 | ret = -ENOMEM; | |
940100a4 | 603 | goto err_reservations; |
0ca1f7ce | 604 | } |
940100a4 | 605 | |
f46b5a66 CH |
606 | if (!PageUptodate(page)) { |
607 | btrfs_readpage(NULL, page); | |
608 | lock_page(page); | |
609 | if (!PageUptodate(page)) { | |
610 | unlock_page(page); | |
611 | page_cache_release(page); | |
0ca1f7ce | 612 | ret = -EIO; |
940100a4 | 613 | goto err_reservations; |
f46b5a66 CH |
614 | } |
615 | } | |
616 | ||
940100a4 CM |
617 | if (page->mapping != inode->i_mapping) { |
618 | unlock_page(page); | |
619 | page_cache_release(page); | |
620 | goto again; | |
621 | } | |
622 | ||
f46b5a66 | 623 | wait_on_page_writeback(page); |
f46b5a66 | 624 | |
940100a4 | 625 | if (PageDirty(page)) { |
0ca1f7ce | 626 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
940100a4 CM |
627 | goto loop_unlock; |
628 | } | |
629 | ||
f46b5a66 CH |
630 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
631 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
f46b5a66 | 632 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
3eaa2885 CM |
633 | |
634 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
635 | if (ordered) { | |
636 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
637 | unlock_page(page); | |
638 | page_cache_release(page); | |
639 | btrfs_start_ordered_extent(inode, ordered, 1); | |
640 | btrfs_put_ordered_extent(ordered); | |
641 | goto again; | |
642 | } | |
643 | set_page_extent_mapped(page); | |
644 | ||
f87f057b CM |
645 | /* |
646 | * this makes sure page_mkwrite is called on the | |
647 | * page if it is dirtied again later | |
648 | */ | |
649 | clear_page_dirty_for_io(page); | |
940100a4 CM |
650 | clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, |
651 | page_end, EXTENT_DIRTY | EXTENT_DELALLOC | | |
652 | EXTENT_DO_ACCOUNTING, GFP_NOFS); | |
f87f057b | 653 | |
2ac55d41 | 654 | btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); |
940100a4 | 655 | ClearPageChecked(page); |
f46b5a66 | 656 | set_page_dirty(page); |
a1ed835e | 657 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
940100a4 CM |
658 | |
659 | loop_unlock: | |
f46b5a66 CH |
660 | unlock_page(page); |
661 | page_cache_release(page); | |
940100a4 CM |
662 | mutex_unlock(&inode->i_mutex); |
663 | ||
f46b5a66 | 664 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); |
940100a4 | 665 | i++; |
f46b5a66 CH |
666 | } |
667 | ||
1e701a32 CM |
668 | if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) |
669 | filemap_flush(inode->i_mapping); | |
670 | ||
671 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
672 | /* the filemap_flush will queue IO into the worker threads, but | |
673 | * we have to make sure the IO is actually started and that | |
674 | * ordered extents get created before we return | |
675 | */ | |
676 | atomic_inc(&root->fs_info->async_submit_draining); | |
677 | while (atomic_read(&root->fs_info->nr_async_submits) || | |
678 | atomic_read(&root->fs_info->async_delalloc_pages)) { | |
679 | wait_event(root->fs_info->async_submit_wait, | |
680 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && | |
681 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); | |
682 | } | |
683 | atomic_dec(&root->fs_info->async_submit_draining); | |
684 | ||
685 | mutex_lock(&inode->i_mutex); | |
686 | BTRFS_I(inode)->force_compress = 0; | |
687 | mutex_unlock(&inode->i_mutex); | |
688 | } | |
689 | ||
f46b5a66 | 690 | return 0; |
940100a4 CM |
691 | |
692 | err_reservations: | |
0ca1f7ce YZ |
693 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
694 | err_unlock: | |
940100a4 | 695 | mutex_unlock(&inode->i_mutex); |
940100a4 | 696 | return ret; |
f46b5a66 CH |
697 | } |
698 | ||
76dda93c YZ |
699 | static noinline int btrfs_ioctl_resize(struct btrfs_root *root, |
700 | void __user *arg) | |
f46b5a66 CH |
701 | { |
702 | u64 new_size; | |
703 | u64 old_size; | |
704 | u64 devid = 1; | |
705 | struct btrfs_ioctl_vol_args *vol_args; | |
706 | struct btrfs_trans_handle *trans; | |
707 | struct btrfs_device *device = NULL; | |
708 | char *sizestr; | |
709 | char *devstr = NULL; | |
710 | int ret = 0; | |
f46b5a66 CH |
711 | int mod = 0; |
712 | ||
c146afad YZ |
713 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
714 | return -EROFS; | |
715 | ||
e441d54d CM |
716 | if (!capable(CAP_SYS_ADMIN)) |
717 | return -EPERM; | |
718 | ||
dae7b665 LZ |
719 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
720 | if (IS_ERR(vol_args)) | |
721 | return PTR_ERR(vol_args); | |
5516e595 MF |
722 | |
723 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 724 | |
7d9eb12c | 725 | mutex_lock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
726 | sizestr = vol_args->name; |
727 | devstr = strchr(sizestr, ':'); | |
728 | if (devstr) { | |
729 | char *end; | |
730 | sizestr = devstr + 1; | |
731 | *devstr = '\0'; | |
732 | devstr = vol_args->name; | |
733 | devid = simple_strtoull(devstr, &end, 10); | |
21380931 JB |
734 | printk(KERN_INFO "resizing devid %llu\n", |
735 | (unsigned long long)devid); | |
f46b5a66 | 736 | } |
2b82032c | 737 | device = btrfs_find_device(root, devid, NULL, NULL); |
f46b5a66 | 738 | if (!device) { |
21380931 JB |
739 | printk(KERN_INFO "resizer unable to find device %llu\n", |
740 | (unsigned long long)devid); | |
f46b5a66 CH |
741 | ret = -EINVAL; |
742 | goto out_unlock; | |
743 | } | |
744 | if (!strcmp(sizestr, "max")) | |
745 | new_size = device->bdev->bd_inode->i_size; | |
746 | else { | |
747 | if (sizestr[0] == '-') { | |
748 | mod = -1; | |
749 | sizestr++; | |
750 | } else if (sizestr[0] == '+') { | |
751 | mod = 1; | |
752 | sizestr++; | |
753 | } | |
91748467 | 754 | new_size = memparse(sizestr, NULL); |
f46b5a66 CH |
755 | if (new_size == 0) { |
756 | ret = -EINVAL; | |
757 | goto out_unlock; | |
758 | } | |
759 | } | |
760 | ||
761 | old_size = device->total_bytes; | |
762 | ||
763 | if (mod < 0) { | |
764 | if (new_size > old_size) { | |
765 | ret = -EINVAL; | |
766 | goto out_unlock; | |
767 | } | |
768 | new_size = old_size - new_size; | |
769 | } else if (mod > 0) { | |
770 | new_size = old_size + new_size; | |
771 | } | |
772 | ||
773 | if (new_size < 256 * 1024 * 1024) { | |
774 | ret = -EINVAL; | |
775 | goto out_unlock; | |
776 | } | |
777 | if (new_size > device->bdev->bd_inode->i_size) { | |
778 | ret = -EFBIG; | |
779 | goto out_unlock; | |
780 | } | |
781 | ||
782 | do_div(new_size, root->sectorsize); | |
783 | new_size *= root->sectorsize; | |
784 | ||
785 | printk(KERN_INFO "new size for %s is %llu\n", | |
786 | device->name, (unsigned long long)new_size); | |
787 | ||
788 | if (new_size > old_size) { | |
a22285a6 | 789 | trans = btrfs_start_transaction(root, 0); |
f46b5a66 CH |
790 | ret = btrfs_grow_device(trans, device, new_size); |
791 | btrfs_commit_transaction(trans, root); | |
792 | } else { | |
793 | ret = btrfs_shrink_device(device, new_size); | |
794 | } | |
795 | ||
796 | out_unlock: | |
7d9eb12c | 797 | mutex_unlock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
798 | kfree(vol_args); |
799 | return ret; | |
800 | } | |
801 | ||
cb8e7090 | 802 | static noinline int btrfs_ioctl_snap_create(struct file *file, |
3de4586c | 803 | void __user *arg, int subvol) |
f46b5a66 | 804 | { |
cb8e7090 | 805 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
f46b5a66 | 806 | struct btrfs_ioctl_vol_args *vol_args; |
3de4586c | 807 | struct file *src_file; |
f46b5a66 | 808 | int namelen; |
3de4586c | 809 | int ret = 0; |
f46b5a66 | 810 | |
c146afad YZ |
811 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
812 | return -EROFS; | |
813 | ||
dae7b665 LZ |
814 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
815 | if (IS_ERR(vol_args)) | |
816 | return PTR_ERR(vol_args); | |
f46b5a66 | 817 | |
5516e595 | 818 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 | 819 | namelen = strlen(vol_args->name); |
f46b5a66 CH |
820 | if (strchr(vol_args->name, '/')) { |
821 | ret = -EINVAL; | |
822 | goto out; | |
823 | } | |
824 | ||
3de4586c | 825 | if (subvol) { |
76dda93c YZ |
826 | ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, |
827 | NULL); | |
cb8e7090 | 828 | } else { |
3de4586c CM |
829 | struct inode *src_inode; |
830 | src_file = fget(vol_args->fd); | |
831 | if (!src_file) { | |
832 | ret = -EINVAL; | |
833 | goto out; | |
834 | } | |
835 | ||
836 | src_inode = src_file->f_path.dentry->d_inode; | |
837 | if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { | |
d397712b CM |
838 | printk(KERN_INFO "btrfs: Snapshot src from " |
839 | "another FS\n"); | |
3de4586c CM |
840 | ret = -EINVAL; |
841 | fput(src_file); | |
842 | goto out; | |
843 | } | |
76dda93c YZ |
844 | ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, |
845 | BTRFS_I(src_inode)->root); | |
3de4586c | 846 | fput(src_file); |
cb8e7090 | 847 | } |
f46b5a66 CH |
848 | out: |
849 | kfree(vol_args); | |
850 | return ret; | |
851 | } | |
852 | ||
76dda93c YZ |
853 | /* |
854 | * helper to check if the subvolume references other subvolumes | |
855 | */ | |
856 | static noinline int may_destroy_subvol(struct btrfs_root *root) | |
857 | { | |
858 | struct btrfs_path *path; | |
859 | struct btrfs_key key; | |
860 | int ret; | |
861 | ||
862 | path = btrfs_alloc_path(); | |
863 | if (!path) | |
864 | return -ENOMEM; | |
865 | ||
866 | key.objectid = root->root_key.objectid; | |
867 | key.type = BTRFS_ROOT_REF_KEY; | |
868 | key.offset = (u64)-1; | |
869 | ||
870 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, | |
871 | &key, path, 0, 0); | |
872 | if (ret < 0) | |
873 | goto out; | |
874 | BUG_ON(ret == 0); | |
875 | ||
876 | ret = 0; | |
877 | if (path->slots[0] > 0) { | |
878 | path->slots[0]--; | |
879 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
880 | if (key.objectid == root->root_key.objectid && | |
881 | key.type == BTRFS_ROOT_REF_KEY) | |
882 | ret = -ENOTEMPTY; | |
883 | } | |
884 | out: | |
885 | btrfs_free_path(path); | |
886 | return ret; | |
887 | } | |
888 | ||
ac8e9819 CM |
889 | static noinline int key_in_sk(struct btrfs_key *key, |
890 | struct btrfs_ioctl_search_key *sk) | |
891 | { | |
abc6e134 CM |
892 | struct btrfs_key test; |
893 | int ret; | |
894 | ||
895 | test.objectid = sk->min_objectid; | |
896 | test.type = sk->min_type; | |
897 | test.offset = sk->min_offset; | |
898 | ||
899 | ret = btrfs_comp_cpu_keys(key, &test); | |
900 | if (ret < 0) | |
ac8e9819 | 901 | return 0; |
abc6e134 CM |
902 | |
903 | test.objectid = sk->max_objectid; | |
904 | test.type = sk->max_type; | |
905 | test.offset = sk->max_offset; | |
906 | ||
907 | ret = btrfs_comp_cpu_keys(key, &test); | |
908 | if (ret > 0) | |
ac8e9819 CM |
909 | return 0; |
910 | return 1; | |
911 | } | |
912 | ||
913 | static noinline int copy_to_sk(struct btrfs_root *root, | |
914 | struct btrfs_path *path, | |
915 | struct btrfs_key *key, | |
916 | struct btrfs_ioctl_search_key *sk, | |
917 | char *buf, | |
918 | unsigned long *sk_offset, | |
919 | int *num_found) | |
920 | { | |
921 | u64 found_transid; | |
922 | struct extent_buffer *leaf; | |
923 | struct btrfs_ioctl_search_header sh; | |
924 | unsigned long item_off; | |
925 | unsigned long item_len; | |
926 | int nritems; | |
927 | int i; | |
928 | int slot; | |
929 | int found = 0; | |
930 | int ret = 0; | |
931 | ||
932 | leaf = path->nodes[0]; | |
933 | slot = path->slots[0]; | |
934 | nritems = btrfs_header_nritems(leaf); | |
935 | ||
936 | if (btrfs_header_generation(leaf) > sk->max_transid) { | |
937 | i = nritems; | |
938 | goto advance_key; | |
939 | } | |
940 | found_transid = btrfs_header_generation(leaf); | |
941 | ||
942 | for (i = slot; i < nritems; i++) { | |
943 | item_off = btrfs_item_ptr_offset(leaf, i); | |
944 | item_len = btrfs_item_size_nr(leaf, i); | |
945 | ||
946 | if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) | |
947 | item_len = 0; | |
948 | ||
949 | if (sizeof(sh) + item_len + *sk_offset > | |
950 | BTRFS_SEARCH_ARGS_BUFSIZE) { | |
951 | ret = 1; | |
952 | goto overflow; | |
953 | } | |
954 | ||
955 | btrfs_item_key_to_cpu(leaf, key, i); | |
956 | if (!key_in_sk(key, sk)) | |
957 | continue; | |
958 | ||
959 | sh.objectid = key->objectid; | |
960 | sh.offset = key->offset; | |
961 | sh.type = key->type; | |
962 | sh.len = item_len; | |
963 | sh.transid = found_transid; | |
964 | ||
965 | /* copy search result header */ | |
966 | memcpy(buf + *sk_offset, &sh, sizeof(sh)); | |
967 | *sk_offset += sizeof(sh); | |
968 | ||
969 | if (item_len) { | |
970 | char *p = buf + *sk_offset; | |
971 | /* copy the item */ | |
972 | read_extent_buffer(leaf, p, | |
973 | item_off, item_len); | |
974 | *sk_offset += item_len; | |
ac8e9819 | 975 | } |
90fdde14 | 976 | found++; |
ac8e9819 CM |
977 | |
978 | if (*num_found >= sk->nr_items) | |
979 | break; | |
980 | } | |
981 | advance_key: | |
abc6e134 CM |
982 | ret = 0; |
983 | if (key->offset < (u64)-1 && key->offset < sk->max_offset) | |
ac8e9819 | 984 | key->offset++; |
abc6e134 CM |
985 | else if (key->type < (u8)-1 && key->type < sk->max_type) { |
986 | key->offset = 0; | |
ac8e9819 | 987 | key->type++; |
abc6e134 CM |
988 | } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { |
989 | key->offset = 0; | |
990 | key->type = 0; | |
ac8e9819 | 991 | key->objectid++; |
abc6e134 CM |
992 | } else |
993 | ret = 1; | |
ac8e9819 CM |
994 | overflow: |
995 | *num_found += found; | |
996 | return ret; | |
997 | } | |
998 | ||
999 | static noinline int search_ioctl(struct inode *inode, | |
1000 | struct btrfs_ioctl_search_args *args) | |
1001 | { | |
1002 | struct btrfs_root *root; | |
1003 | struct btrfs_key key; | |
1004 | struct btrfs_key max_key; | |
1005 | struct btrfs_path *path; | |
1006 | struct btrfs_ioctl_search_key *sk = &args->key; | |
1007 | struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; | |
1008 | int ret; | |
1009 | int num_found = 0; | |
1010 | unsigned long sk_offset = 0; | |
1011 | ||
1012 | path = btrfs_alloc_path(); | |
1013 | if (!path) | |
1014 | return -ENOMEM; | |
1015 | ||
1016 | if (sk->tree_id == 0) { | |
1017 | /* search the root of the inode that was passed */ | |
1018 | root = BTRFS_I(inode)->root; | |
1019 | } else { | |
1020 | key.objectid = sk->tree_id; | |
1021 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1022 | key.offset = (u64)-1; | |
1023 | root = btrfs_read_fs_root_no_name(info, &key); | |
1024 | if (IS_ERR(root)) { | |
1025 | printk(KERN_ERR "could not find root %llu\n", | |
1026 | sk->tree_id); | |
1027 | btrfs_free_path(path); | |
1028 | return -ENOENT; | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | key.objectid = sk->min_objectid; | |
1033 | key.type = sk->min_type; | |
1034 | key.offset = sk->min_offset; | |
1035 | ||
1036 | max_key.objectid = sk->max_objectid; | |
1037 | max_key.type = sk->max_type; | |
1038 | max_key.offset = sk->max_offset; | |
1039 | ||
1040 | path->keep_locks = 1; | |
1041 | ||
1042 | while(1) { | |
1043 | ret = btrfs_search_forward(root, &key, &max_key, path, 0, | |
1044 | sk->min_transid); | |
1045 | if (ret != 0) { | |
1046 | if (ret > 0) | |
1047 | ret = 0; | |
1048 | goto err; | |
1049 | } | |
1050 | ret = copy_to_sk(root, path, &key, sk, args->buf, | |
1051 | &sk_offset, &num_found); | |
1052 | btrfs_release_path(root, path); | |
1053 | if (ret || num_found >= sk->nr_items) | |
1054 | break; | |
1055 | ||
1056 | } | |
1057 | ret = 0; | |
1058 | err: | |
1059 | sk->nr_items = num_found; | |
1060 | btrfs_free_path(path); | |
1061 | return ret; | |
1062 | } | |
1063 | ||
1064 | static noinline int btrfs_ioctl_tree_search(struct file *file, | |
1065 | void __user *argp) | |
1066 | { | |
1067 | struct btrfs_ioctl_search_args *args; | |
1068 | struct inode *inode; | |
1069 | int ret; | |
1070 | ||
1071 | if (!capable(CAP_SYS_ADMIN)) | |
1072 | return -EPERM; | |
1073 | ||
2354d08f JL |
1074 | args = memdup_user(argp, sizeof(*args)); |
1075 | if (IS_ERR(args)) | |
1076 | return PTR_ERR(args); | |
ac8e9819 | 1077 | |
ac8e9819 CM |
1078 | inode = fdentry(file)->d_inode; |
1079 | ret = search_ioctl(inode, args); | |
1080 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
1081 | ret = -EFAULT; | |
1082 | kfree(args); | |
1083 | return ret; | |
1084 | } | |
1085 | ||
98d377a0 | 1086 | /* |
ac8e9819 CM |
1087 | * Search INODE_REFs to identify path name of 'dirid' directory |
1088 | * in a 'tree_id' tree. and sets path name to 'name'. | |
1089 | */ | |
98d377a0 TH |
1090 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
1091 | u64 tree_id, u64 dirid, char *name) | |
1092 | { | |
1093 | struct btrfs_root *root; | |
1094 | struct btrfs_key key; | |
ac8e9819 | 1095 | char *ptr; |
98d377a0 TH |
1096 | int ret = -1; |
1097 | int slot; | |
1098 | int len; | |
1099 | int total_len = 0; | |
1100 | struct btrfs_inode_ref *iref; | |
1101 | struct extent_buffer *l; | |
1102 | struct btrfs_path *path; | |
1103 | ||
1104 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { | |
1105 | name[0]='\0'; | |
1106 | return 0; | |
1107 | } | |
1108 | ||
1109 | path = btrfs_alloc_path(); | |
1110 | if (!path) | |
1111 | return -ENOMEM; | |
1112 | ||
ac8e9819 | 1113 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; |
98d377a0 TH |
1114 | |
1115 | key.objectid = tree_id; | |
1116 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1117 | key.offset = (u64)-1; | |
1118 | root = btrfs_read_fs_root_no_name(info, &key); | |
1119 | if (IS_ERR(root)) { | |
1120 | printk(KERN_ERR "could not find root %llu\n", tree_id); | |
8ad6fcab CM |
1121 | ret = -ENOENT; |
1122 | goto out; | |
98d377a0 TH |
1123 | } |
1124 | ||
1125 | key.objectid = dirid; | |
1126 | key.type = BTRFS_INODE_REF_KEY; | |
8ad6fcab | 1127 | key.offset = (u64)-1; |
98d377a0 TH |
1128 | |
1129 | while(1) { | |
1130 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1131 | if (ret < 0) | |
1132 | goto out; | |
1133 | ||
1134 | l = path->nodes[0]; | |
1135 | slot = path->slots[0]; | |
8ad6fcab CM |
1136 | if (ret > 0 && slot > 0) |
1137 | slot--; | |
98d377a0 TH |
1138 | btrfs_item_key_to_cpu(l, &key, slot); |
1139 | ||
1140 | if (ret > 0 && (key.objectid != dirid || | |
ac8e9819 CM |
1141 | key.type != BTRFS_INODE_REF_KEY)) { |
1142 | ret = -ENOENT; | |
98d377a0 | 1143 | goto out; |
ac8e9819 | 1144 | } |
98d377a0 TH |
1145 | |
1146 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); | |
1147 | len = btrfs_inode_ref_name_len(l, iref); | |
1148 | ptr -= len + 1; | |
1149 | total_len += len + 1; | |
ac8e9819 | 1150 | if (ptr < name) |
98d377a0 TH |
1151 | goto out; |
1152 | ||
1153 | *(ptr + len) = '/'; | |
1154 | read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); | |
1155 | ||
1156 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) | |
1157 | break; | |
1158 | ||
1159 | btrfs_release_path(root, path); | |
1160 | key.objectid = key.offset; | |
8ad6fcab | 1161 | key.offset = (u64)-1; |
98d377a0 TH |
1162 | dirid = key.objectid; |
1163 | ||
1164 | } | |
ac8e9819 | 1165 | if (ptr < name) |
98d377a0 | 1166 | goto out; |
ac8e9819 | 1167 | memcpy(name, ptr, total_len); |
98d377a0 TH |
1168 | name[total_len]='\0'; |
1169 | ret = 0; | |
1170 | out: | |
1171 | btrfs_free_path(path); | |
ac8e9819 CM |
1172 | return ret; |
1173 | } | |
1174 | ||
1175 | static noinline int btrfs_ioctl_ino_lookup(struct file *file, | |
1176 | void __user *argp) | |
1177 | { | |
1178 | struct btrfs_ioctl_ino_lookup_args *args; | |
1179 | struct inode *inode; | |
1180 | int ret; | |
1181 | ||
1182 | if (!capable(CAP_SYS_ADMIN)) | |
1183 | return -EPERM; | |
1184 | ||
2354d08f JL |
1185 | args = memdup_user(argp, sizeof(*args)); |
1186 | if (IS_ERR(args)) | |
1187 | return PTR_ERR(args); | |
c2b96929 | 1188 | |
ac8e9819 CM |
1189 | inode = fdentry(file)->d_inode; |
1190 | ||
1b53ac4d CM |
1191 | if (args->treeid == 0) |
1192 | args->treeid = BTRFS_I(inode)->root->root_key.objectid; | |
1193 | ||
ac8e9819 CM |
1194 | ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, |
1195 | args->treeid, args->objectid, | |
1196 | args->name); | |
1197 | ||
1198 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
1199 | ret = -EFAULT; | |
1200 | ||
1201 | kfree(args); | |
98d377a0 TH |
1202 | return ret; |
1203 | } | |
1204 | ||
76dda93c YZ |
1205 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
1206 | void __user *arg) | |
1207 | { | |
1208 | struct dentry *parent = fdentry(file); | |
1209 | struct dentry *dentry; | |
1210 | struct inode *dir = parent->d_inode; | |
1211 | struct inode *inode; | |
1212 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1213 | struct btrfs_root *dest = NULL; | |
1214 | struct btrfs_ioctl_vol_args *vol_args; | |
1215 | struct btrfs_trans_handle *trans; | |
1216 | int namelen; | |
1217 | int ret; | |
1218 | int err = 0; | |
1219 | ||
1220 | if (!capable(CAP_SYS_ADMIN)) | |
1221 | return -EPERM; | |
1222 | ||
1223 | vol_args = memdup_user(arg, sizeof(*vol_args)); | |
1224 | if (IS_ERR(vol_args)) | |
1225 | return PTR_ERR(vol_args); | |
1226 | ||
1227 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
1228 | namelen = strlen(vol_args->name); | |
1229 | if (strchr(vol_args->name, '/') || | |
1230 | strncmp(vol_args->name, "..", namelen) == 0) { | |
1231 | err = -EINVAL; | |
1232 | goto out; | |
1233 | } | |
1234 | ||
1235 | err = mnt_want_write(file->f_path.mnt); | |
1236 | if (err) | |
1237 | goto out; | |
1238 | ||
1239 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
1240 | dentry = lookup_one_len(vol_args->name, parent, namelen); | |
1241 | if (IS_ERR(dentry)) { | |
1242 | err = PTR_ERR(dentry); | |
1243 | goto out_unlock_dir; | |
1244 | } | |
1245 | ||
1246 | if (!dentry->d_inode) { | |
1247 | err = -ENOENT; | |
1248 | goto out_dput; | |
1249 | } | |
1250 | ||
1251 | inode = dentry->d_inode; | |
1252 | if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { | |
1253 | err = -EINVAL; | |
1254 | goto out_dput; | |
1255 | } | |
1256 | ||
1257 | dest = BTRFS_I(inode)->root; | |
1258 | ||
1259 | mutex_lock(&inode->i_mutex); | |
1260 | err = d_invalidate(dentry); | |
1261 | if (err) | |
1262 | goto out_unlock; | |
1263 | ||
1264 | down_write(&root->fs_info->subvol_sem); | |
1265 | ||
1266 | err = may_destroy_subvol(dest); | |
1267 | if (err) | |
1268 | goto out_up_write; | |
1269 | ||
a22285a6 YZ |
1270 | trans = btrfs_start_transaction(root, 0); |
1271 | if (IS_ERR(trans)) { | |
1272 | err = PTR_ERR(trans); | |
d327099a | 1273 | goto out_up_write; |
a22285a6 YZ |
1274 | } |
1275 | trans->block_rsv = &root->fs_info->global_block_rsv; | |
1276 | ||
76dda93c YZ |
1277 | ret = btrfs_unlink_subvol(trans, root, dir, |
1278 | dest->root_key.objectid, | |
1279 | dentry->d_name.name, | |
1280 | dentry->d_name.len); | |
1281 | BUG_ON(ret); | |
1282 | ||
1283 | btrfs_record_root_in_trans(trans, dest); | |
1284 | ||
1285 | memset(&dest->root_item.drop_progress, 0, | |
1286 | sizeof(dest->root_item.drop_progress)); | |
1287 | dest->root_item.drop_level = 0; | |
1288 | btrfs_set_root_refs(&dest->root_item, 0); | |
1289 | ||
d68fc57b YZ |
1290 | if (!xchg(&dest->orphan_item_inserted, 1)) { |
1291 | ret = btrfs_insert_orphan_item(trans, | |
1292 | root->fs_info->tree_root, | |
1293 | dest->root_key.objectid); | |
1294 | BUG_ON(ret); | |
1295 | } | |
76dda93c YZ |
1296 | |
1297 | ret = btrfs_commit_transaction(trans, root); | |
1298 | BUG_ON(ret); | |
1299 | inode->i_flags |= S_DEAD; | |
1300 | out_up_write: | |
1301 | up_write(&root->fs_info->subvol_sem); | |
1302 | out_unlock: | |
1303 | mutex_unlock(&inode->i_mutex); | |
1304 | if (!err) { | |
efefb143 | 1305 | shrink_dcache_sb(root->fs_info->sb); |
76dda93c YZ |
1306 | btrfs_invalidate_inodes(dest); |
1307 | d_delete(dentry); | |
1308 | } | |
1309 | out_dput: | |
1310 | dput(dentry); | |
1311 | out_unlock_dir: | |
1312 | mutex_unlock(&dir->i_mutex); | |
1313 | mnt_drop_write(file->f_path.mnt); | |
1314 | out: | |
1315 | kfree(vol_args); | |
1316 | return err; | |
1317 | } | |
1318 | ||
1e701a32 | 1319 | static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
f46b5a66 CH |
1320 | { |
1321 | struct inode *inode = fdentry(file)->d_inode; | |
1322 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1e701a32 | 1323 | struct btrfs_ioctl_defrag_range_args *range; |
c146afad YZ |
1324 | int ret; |
1325 | ||
1326 | ret = mnt_want_write(file->f_path.mnt); | |
1327 | if (ret) | |
1328 | return ret; | |
f46b5a66 CH |
1329 | |
1330 | switch (inode->i_mode & S_IFMT) { | |
1331 | case S_IFDIR: | |
e441d54d CM |
1332 | if (!capable(CAP_SYS_ADMIN)) { |
1333 | ret = -EPERM; | |
1334 | goto out; | |
1335 | } | |
8929ecfa YZ |
1336 | ret = btrfs_defrag_root(root, 0); |
1337 | if (ret) | |
1338 | goto out; | |
1339 | ret = btrfs_defrag_root(root->fs_info->extent_root, 0); | |
f46b5a66 CH |
1340 | break; |
1341 | case S_IFREG: | |
e441d54d CM |
1342 | if (!(file->f_mode & FMODE_WRITE)) { |
1343 | ret = -EINVAL; | |
1344 | goto out; | |
1345 | } | |
1e701a32 CM |
1346 | |
1347 | range = kzalloc(sizeof(*range), GFP_KERNEL); | |
1348 | if (!range) { | |
1349 | ret = -ENOMEM; | |
1350 | goto out; | |
1351 | } | |
1352 | ||
1353 | if (argp) { | |
1354 | if (copy_from_user(range, argp, | |
1355 | sizeof(*range))) { | |
1356 | ret = -EFAULT; | |
1357 | kfree(range); | |
683be16e | 1358 | goto out; |
1e701a32 CM |
1359 | } |
1360 | /* compression requires us to start the IO */ | |
1361 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
1362 | range->flags |= BTRFS_DEFRAG_RANGE_START_IO; | |
1363 | range->extent_thresh = (u32)-1; | |
1364 | } | |
1365 | } else { | |
1366 | /* the rest are all set to zero by kzalloc */ | |
1367 | range->len = (u64)-1; | |
1368 | } | |
8929ecfa | 1369 | ret = btrfs_defrag_file(file, range); |
1e701a32 | 1370 | kfree(range); |
f46b5a66 | 1371 | break; |
8929ecfa YZ |
1372 | default: |
1373 | ret = -EINVAL; | |
f46b5a66 | 1374 | } |
e441d54d | 1375 | out: |
ab67b7c1 | 1376 | mnt_drop_write(file->f_path.mnt); |
e441d54d | 1377 | return ret; |
f46b5a66 CH |
1378 | } |
1379 | ||
b2950863 | 1380 | static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
1381 | { |
1382 | struct btrfs_ioctl_vol_args *vol_args; | |
1383 | int ret; | |
1384 | ||
e441d54d CM |
1385 | if (!capable(CAP_SYS_ADMIN)) |
1386 | return -EPERM; | |
1387 | ||
dae7b665 LZ |
1388 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1389 | if (IS_ERR(vol_args)) | |
1390 | return PTR_ERR(vol_args); | |
f46b5a66 | 1391 | |
5516e595 | 1392 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
1393 | ret = btrfs_init_new_device(root, vol_args->name); |
1394 | ||
f46b5a66 CH |
1395 | kfree(vol_args); |
1396 | return ret; | |
1397 | } | |
1398 | ||
b2950863 | 1399 | static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
1400 | { |
1401 | struct btrfs_ioctl_vol_args *vol_args; | |
1402 | int ret; | |
1403 | ||
e441d54d CM |
1404 | if (!capable(CAP_SYS_ADMIN)) |
1405 | return -EPERM; | |
1406 | ||
c146afad YZ |
1407 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
1408 | return -EROFS; | |
1409 | ||
dae7b665 LZ |
1410 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1411 | if (IS_ERR(vol_args)) | |
1412 | return PTR_ERR(vol_args); | |
f46b5a66 | 1413 | |
5516e595 | 1414 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
1415 | ret = btrfs_rm_device(root, vol_args->name); |
1416 | ||
f46b5a66 CH |
1417 | kfree(vol_args); |
1418 | return ret; | |
1419 | } | |
1420 | ||
76dda93c YZ |
1421 | static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, |
1422 | u64 off, u64 olen, u64 destoff) | |
f46b5a66 CH |
1423 | { |
1424 | struct inode *inode = fdentry(file)->d_inode; | |
1425 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1426 | struct file *src_file; | |
1427 | struct inode *src; | |
1428 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 1429 | struct btrfs_path *path; |
f46b5a66 | 1430 | struct extent_buffer *leaf; |
ae01a0ab YZ |
1431 | char *buf; |
1432 | struct btrfs_key key; | |
f46b5a66 CH |
1433 | u32 nritems; |
1434 | int slot; | |
ae01a0ab | 1435 | int ret; |
c5c9cd4d SW |
1436 | u64 len = olen; |
1437 | u64 bs = root->fs_info->sb->s_blocksize; | |
1438 | u64 hint_byte; | |
d20f7043 | 1439 | |
c5c9cd4d SW |
1440 | /* |
1441 | * TODO: | |
1442 | * - split compressed inline extents. annoying: we need to | |
1443 | * decompress into destination's address_space (the file offset | |
1444 | * may change, so source mapping won't do), then recompress (or | |
1445 | * otherwise reinsert) a subrange. | |
1446 | * - allow ranges within the same file to be cloned (provided | |
1447 | * they don't overlap)? | |
1448 | */ | |
1449 | ||
e441d54d | 1450 | /* the destination must be opened for writing */ |
2ebc3464 | 1451 | if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) |
e441d54d CM |
1452 | return -EINVAL; |
1453 | ||
c146afad YZ |
1454 | ret = mnt_want_write(file->f_path.mnt); |
1455 | if (ret) | |
1456 | return ret; | |
1457 | ||
c5c9cd4d | 1458 | src_file = fget(srcfd); |
ab67b7c1 YZ |
1459 | if (!src_file) { |
1460 | ret = -EBADF; | |
1461 | goto out_drop_write; | |
1462 | } | |
5dc64164 | 1463 | |
f46b5a66 CH |
1464 | src = src_file->f_dentry->d_inode; |
1465 | ||
c5c9cd4d SW |
1466 | ret = -EINVAL; |
1467 | if (src == inode) | |
1468 | goto out_fput; | |
1469 | ||
5dc64164 DR |
1470 | /* the src must be open for reading */ |
1471 | if (!(src_file->f_mode & FMODE_READ)) | |
1472 | goto out_fput; | |
1473 | ||
ae01a0ab YZ |
1474 | ret = -EISDIR; |
1475 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) | |
1476 | goto out_fput; | |
1477 | ||
f46b5a66 | 1478 | ret = -EXDEV; |
ae01a0ab YZ |
1479 | if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) |
1480 | goto out_fput; | |
1481 | ||
1482 | ret = -ENOMEM; | |
1483 | buf = vmalloc(btrfs_level_size(root, 0)); | |
1484 | if (!buf) | |
1485 | goto out_fput; | |
1486 | ||
1487 | path = btrfs_alloc_path(); | |
1488 | if (!path) { | |
1489 | vfree(buf); | |
f46b5a66 | 1490 | goto out_fput; |
ae01a0ab YZ |
1491 | } |
1492 | path->reada = 2; | |
f46b5a66 CH |
1493 | |
1494 | if (inode < src) { | |
1495 | mutex_lock(&inode->i_mutex); | |
1496 | mutex_lock(&src->i_mutex); | |
1497 | } else { | |
1498 | mutex_lock(&src->i_mutex); | |
1499 | mutex_lock(&inode->i_mutex); | |
1500 | } | |
1501 | ||
c5c9cd4d SW |
1502 | /* determine range to clone */ |
1503 | ret = -EINVAL; | |
2ebc3464 | 1504 | if (off + len > src->i_size || off + len < off) |
f46b5a66 | 1505 | goto out_unlock; |
c5c9cd4d SW |
1506 | if (len == 0) |
1507 | olen = len = src->i_size - off; | |
1508 | /* if we extend to eof, continue to block boundary */ | |
1509 | if (off + len == src->i_size) | |
1510 | len = ((src->i_size + bs-1) & ~(bs-1)) | |
1511 | - off; | |
1512 | ||
1513 | /* verify the end result is block aligned */ | |
1514 | if ((off & (bs-1)) || | |
1515 | ((off + len) & (bs-1))) | |
1516 | goto out_unlock; | |
1517 | ||
f46b5a66 CH |
1518 | /* do any pending delalloc/csum calc on src, one way or |
1519 | another, and lock file content */ | |
1520 | while (1) { | |
31840ae1 | 1521 | struct btrfs_ordered_extent *ordered; |
c5c9cd4d | 1522 | lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
9a019196 SW |
1523 | ordered = btrfs_lookup_first_ordered_extent(src, off+len); |
1524 | if (!ordered && | |
1525 | !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len, | |
1526 | EXTENT_DELALLOC, 0, NULL)) | |
f46b5a66 | 1527 | break; |
c5c9cd4d | 1528 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
ae01a0ab YZ |
1529 | if (ordered) |
1530 | btrfs_put_ordered_extent(ordered); | |
9a019196 | 1531 | btrfs_wait_ordered_range(src, off, len); |
f46b5a66 CH |
1532 | } |
1533 | ||
c5c9cd4d | 1534 | /* clone data */ |
f46b5a66 | 1535 | key.objectid = src->i_ino; |
ae01a0ab YZ |
1536 | key.type = BTRFS_EXTENT_DATA_KEY; |
1537 | key.offset = 0; | |
f46b5a66 CH |
1538 | |
1539 | while (1) { | |
1540 | /* | |
1541 | * note the key will change type as we walk through the | |
1542 | * tree. | |
1543 | */ | |
a22285a6 | 1544 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
f46b5a66 CH |
1545 | if (ret < 0) |
1546 | goto out; | |
1547 | ||
ae01a0ab YZ |
1548 | nritems = btrfs_header_nritems(path->nodes[0]); |
1549 | if (path->slots[0] >= nritems) { | |
f46b5a66 CH |
1550 | ret = btrfs_next_leaf(root, path); |
1551 | if (ret < 0) | |
1552 | goto out; | |
1553 | if (ret > 0) | |
1554 | break; | |
ae01a0ab | 1555 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
1556 | } |
1557 | leaf = path->nodes[0]; | |
1558 | slot = path->slots[0]; | |
f46b5a66 | 1559 | |
ae01a0ab | 1560 | btrfs_item_key_to_cpu(leaf, &key, slot); |
d20f7043 | 1561 | if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || |
f46b5a66 CH |
1562 | key.objectid != src->i_ino) |
1563 | break; | |
1564 | ||
c5c9cd4d SW |
1565 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
1566 | struct btrfs_file_extent_item *extent; | |
1567 | int type; | |
31840ae1 ZY |
1568 | u32 size; |
1569 | struct btrfs_key new_key; | |
c5c9cd4d SW |
1570 | u64 disko = 0, diskl = 0; |
1571 | u64 datao = 0, datal = 0; | |
1572 | u8 comp; | |
b5384d48 | 1573 | u64 endoff; |
31840ae1 ZY |
1574 | |
1575 | size = btrfs_item_size_nr(leaf, slot); | |
1576 | read_extent_buffer(leaf, buf, | |
1577 | btrfs_item_ptr_offset(leaf, slot), | |
1578 | size); | |
c5c9cd4d SW |
1579 | |
1580 | extent = btrfs_item_ptr(leaf, slot, | |
1581 | struct btrfs_file_extent_item); | |
1582 | comp = btrfs_file_extent_compression(leaf, extent); | |
1583 | type = btrfs_file_extent_type(leaf, extent); | |
c8a894d7 CM |
1584 | if (type == BTRFS_FILE_EXTENT_REG || |
1585 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d397712b CM |
1586 | disko = btrfs_file_extent_disk_bytenr(leaf, |
1587 | extent); | |
1588 | diskl = btrfs_file_extent_disk_num_bytes(leaf, | |
1589 | extent); | |
c5c9cd4d | 1590 | datao = btrfs_file_extent_offset(leaf, extent); |
d397712b CM |
1591 | datal = btrfs_file_extent_num_bytes(leaf, |
1592 | extent); | |
c5c9cd4d SW |
1593 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
1594 | /* take upper bound, may be compressed */ | |
1595 | datal = btrfs_file_extent_ram_bytes(leaf, | |
1596 | extent); | |
1597 | } | |
31840ae1 ZY |
1598 | btrfs_release_path(root, path); |
1599 | ||
050006a7 | 1600 | if (key.offset + datal <= off || |
c5c9cd4d SW |
1601 | key.offset >= off+len) |
1602 | goto next; | |
1603 | ||
31840ae1 ZY |
1604 | memcpy(&new_key, &key, sizeof(new_key)); |
1605 | new_key.objectid = inode->i_ino; | |
c5c9cd4d | 1606 | new_key.offset = key.offset + destoff - off; |
31840ae1 | 1607 | |
a22285a6 YZ |
1608 | trans = btrfs_start_transaction(root, 1); |
1609 | if (IS_ERR(trans)) { | |
1610 | ret = PTR_ERR(trans); | |
1611 | goto out; | |
1612 | } | |
1613 | ||
c8a894d7 CM |
1614 | if (type == BTRFS_FILE_EXTENT_REG || |
1615 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
a22285a6 YZ |
1616 | if (off > key.offset) { |
1617 | datao += off - key.offset; | |
1618 | datal -= off - key.offset; | |
1619 | } | |
1620 | ||
1621 | if (key.offset + datal > off + len) | |
1622 | datal = off + len - key.offset; | |
1623 | ||
1624 | ret = btrfs_drop_extents(trans, inode, | |
1625 | new_key.offset, | |
1626 | new_key.offset + datal, | |
1627 | &hint_byte, 1); | |
1628 | BUG_ON(ret); | |
1629 | ||
c5c9cd4d SW |
1630 | ret = btrfs_insert_empty_item(trans, root, path, |
1631 | &new_key, size); | |
a22285a6 | 1632 | BUG_ON(ret); |
c5c9cd4d SW |
1633 | |
1634 | leaf = path->nodes[0]; | |
1635 | slot = path->slots[0]; | |
1636 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
1637 | btrfs_item_ptr_offset(leaf, slot), |
1638 | size); | |
ae01a0ab | 1639 | |
c5c9cd4d | 1640 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 1641 | struct btrfs_file_extent_item); |
c5c9cd4d | 1642 | |
c5c9cd4d SW |
1643 | /* disko == 0 means it's a hole */ |
1644 | if (!disko) | |
1645 | datao = 0; | |
c5c9cd4d SW |
1646 | |
1647 | btrfs_set_file_extent_offset(leaf, extent, | |
1648 | datao); | |
1649 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
1650 | datal); | |
1651 | if (disko) { | |
1652 | inode_add_bytes(inode, datal); | |
ae01a0ab | 1653 | ret = btrfs_inc_extent_ref(trans, root, |
5d4f98a2 YZ |
1654 | disko, diskl, 0, |
1655 | root->root_key.objectid, | |
1656 | inode->i_ino, | |
1657 | new_key.offset - datao); | |
31840ae1 | 1658 | BUG_ON(ret); |
f46b5a66 | 1659 | } |
c5c9cd4d SW |
1660 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
1661 | u64 skip = 0; | |
1662 | u64 trim = 0; | |
1663 | if (off > key.offset) { | |
1664 | skip = off - key.offset; | |
1665 | new_key.offset += skip; | |
1666 | } | |
d397712b | 1667 | |
c5c9cd4d SW |
1668 | if (key.offset + datal > off+len) |
1669 | trim = key.offset + datal - (off+len); | |
d397712b | 1670 | |
c5c9cd4d | 1671 | if (comp && (skip || trim)) { |
c5c9cd4d | 1672 | ret = -EINVAL; |
a22285a6 | 1673 | btrfs_end_transaction(trans, root); |
c5c9cd4d SW |
1674 | goto out; |
1675 | } | |
1676 | size -= skip + trim; | |
1677 | datal -= skip + trim; | |
a22285a6 YZ |
1678 | |
1679 | ret = btrfs_drop_extents(trans, inode, | |
1680 | new_key.offset, | |
1681 | new_key.offset + datal, | |
1682 | &hint_byte, 1); | |
1683 | BUG_ON(ret); | |
1684 | ||
c5c9cd4d SW |
1685 | ret = btrfs_insert_empty_item(trans, root, path, |
1686 | &new_key, size); | |
a22285a6 | 1687 | BUG_ON(ret); |
c5c9cd4d SW |
1688 | |
1689 | if (skip) { | |
d397712b CM |
1690 | u32 start = |
1691 | btrfs_file_extent_calc_inline_size(0); | |
c5c9cd4d SW |
1692 | memmove(buf+start, buf+start+skip, |
1693 | datal); | |
1694 | } | |
1695 | ||
1696 | leaf = path->nodes[0]; | |
1697 | slot = path->slots[0]; | |
1698 | write_extent_buffer(leaf, buf, | |
1699 | btrfs_item_ptr_offset(leaf, slot), | |
1700 | size); | |
1701 | inode_add_bytes(inode, datal); | |
f46b5a66 | 1702 | } |
c5c9cd4d SW |
1703 | |
1704 | btrfs_mark_buffer_dirty(leaf); | |
a22285a6 | 1705 | btrfs_release_path(root, path); |
c5c9cd4d | 1706 | |
a22285a6 | 1707 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
b5384d48 SW |
1708 | |
1709 | /* | |
1710 | * we round up to the block size at eof when | |
1711 | * determining which extents to clone above, | |
1712 | * but shouldn't round up the file size | |
1713 | */ | |
1714 | endoff = new_key.offset + datal; | |
1715 | if (endoff > off+olen) | |
1716 | endoff = off+olen; | |
1717 | if (endoff > inode->i_size) | |
1718 | btrfs_i_size_write(inode, endoff); | |
1719 | ||
a22285a6 YZ |
1720 | BTRFS_I(inode)->flags = BTRFS_I(src)->flags; |
1721 | ret = btrfs_update_inode(trans, root, inode); | |
1722 | BUG_ON(ret); | |
1723 | btrfs_end_transaction(trans, root); | |
1724 | } | |
d397712b | 1725 | next: |
31840ae1 | 1726 | btrfs_release_path(root, path); |
f46b5a66 | 1727 | key.offset++; |
f46b5a66 | 1728 | } |
f46b5a66 CH |
1729 | ret = 0; |
1730 | out: | |
ae01a0ab | 1731 | btrfs_release_path(root, path); |
c5c9cd4d | 1732 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
f46b5a66 CH |
1733 | out_unlock: |
1734 | mutex_unlock(&src->i_mutex); | |
1735 | mutex_unlock(&inode->i_mutex); | |
ae01a0ab YZ |
1736 | vfree(buf); |
1737 | btrfs_free_path(path); | |
f46b5a66 CH |
1738 | out_fput: |
1739 | fput(src_file); | |
ab67b7c1 YZ |
1740 | out_drop_write: |
1741 | mnt_drop_write(file->f_path.mnt); | |
f46b5a66 CH |
1742 | return ret; |
1743 | } | |
1744 | ||
7a865e8a | 1745 | static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) |
c5c9cd4d SW |
1746 | { |
1747 | struct btrfs_ioctl_clone_range_args args; | |
1748 | ||
7a865e8a | 1749 | if (copy_from_user(&args, argp, sizeof(args))) |
c5c9cd4d SW |
1750 | return -EFAULT; |
1751 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, | |
1752 | args.src_length, args.dest_offset); | |
1753 | } | |
1754 | ||
f46b5a66 CH |
1755 | /* |
1756 | * there are many ways the trans_start and trans_end ioctls can lead | |
1757 | * to deadlocks. They should only be used by applications that | |
1758 | * basically own the machine, and have a very in depth understanding | |
1759 | * of all the possible deadlocks and enospc problems. | |
1760 | */ | |
b2950863 | 1761 | static long btrfs_ioctl_trans_start(struct file *file) |
f46b5a66 CH |
1762 | { |
1763 | struct inode *inode = fdentry(file)->d_inode; | |
1764 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1765 | struct btrfs_trans_handle *trans; | |
1ab86aed | 1766 | int ret; |
f46b5a66 | 1767 | |
1ab86aed | 1768 | ret = -EPERM; |
df5b5520 | 1769 | if (!capable(CAP_SYS_ADMIN)) |
1ab86aed | 1770 | goto out; |
df5b5520 | 1771 | |
1ab86aed SW |
1772 | ret = -EINPROGRESS; |
1773 | if (file->private_data) | |
f46b5a66 | 1774 | goto out; |
9ca9ee09 | 1775 | |
c146afad YZ |
1776 | ret = mnt_want_write(file->f_path.mnt); |
1777 | if (ret) | |
1778 | goto out; | |
1779 | ||
9ca9ee09 SW |
1780 | mutex_lock(&root->fs_info->trans_mutex); |
1781 | root->fs_info->open_ioctl_trans++; | |
1782 | mutex_unlock(&root->fs_info->trans_mutex); | |
1783 | ||
1ab86aed | 1784 | ret = -ENOMEM; |
9ca9ee09 | 1785 | trans = btrfs_start_ioctl_transaction(root, 0); |
1ab86aed SW |
1786 | if (!trans) |
1787 | goto out_drop; | |
1788 | ||
1789 | file->private_data = trans; | |
1790 | return 0; | |
1791 | ||
1792 | out_drop: | |
1793 | mutex_lock(&root->fs_info->trans_mutex); | |
1794 | root->fs_info->open_ioctl_trans--; | |
1795 | mutex_unlock(&root->fs_info->trans_mutex); | |
1796 | mnt_drop_write(file->f_path.mnt); | |
f46b5a66 | 1797 | out: |
f46b5a66 CH |
1798 | return ret; |
1799 | } | |
1800 | ||
6ef5ed0d JB |
1801 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
1802 | { | |
1803 | struct inode *inode = fdentry(file)->d_inode; | |
1804 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1805 | struct btrfs_root *new_root; | |
1806 | struct btrfs_dir_item *di; | |
1807 | struct btrfs_trans_handle *trans; | |
1808 | struct btrfs_path *path; | |
1809 | struct btrfs_key location; | |
1810 | struct btrfs_disk_key disk_key; | |
1811 | struct btrfs_super_block *disk_super; | |
1812 | u64 features; | |
1813 | u64 objectid = 0; | |
1814 | u64 dir_id; | |
1815 | ||
1816 | if (!capable(CAP_SYS_ADMIN)) | |
1817 | return -EPERM; | |
1818 | ||
1819 | if (copy_from_user(&objectid, argp, sizeof(objectid))) | |
1820 | return -EFAULT; | |
1821 | ||
1822 | if (!objectid) | |
1823 | objectid = root->root_key.objectid; | |
1824 | ||
1825 | location.objectid = objectid; | |
1826 | location.type = BTRFS_ROOT_ITEM_KEY; | |
1827 | location.offset = (u64)-1; | |
1828 | ||
1829 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
1830 | if (IS_ERR(new_root)) | |
1831 | return PTR_ERR(new_root); | |
1832 | ||
1833 | if (btrfs_root_refs(&new_root->root_item) == 0) | |
1834 | return -ENOENT; | |
1835 | ||
1836 | path = btrfs_alloc_path(); | |
1837 | if (!path) | |
1838 | return -ENOMEM; | |
1839 | path->leave_spinning = 1; | |
1840 | ||
1841 | trans = btrfs_start_transaction(root, 1); | |
1842 | if (!trans) { | |
1843 | btrfs_free_path(path); | |
1844 | return -ENOMEM; | |
1845 | } | |
1846 | ||
1847 | dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); | |
1848 | di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, | |
1849 | dir_id, "default", 7, 1); | |
cf1e99a4 | 1850 | if (IS_ERR_OR_NULL(di)) { |
6ef5ed0d JB |
1851 | btrfs_free_path(path); |
1852 | btrfs_end_transaction(trans, root); | |
1853 | printk(KERN_ERR "Umm, you don't have the default dir item, " | |
1854 | "this isn't going to work\n"); | |
1855 | return -ENOENT; | |
1856 | } | |
1857 | ||
1858 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); | |
1859 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); | |
1860 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
1861 | btrfs_free_path(path); | |
1862 | ||
1863 | disk_super = &root->fs_info->super_copy; | |
1864 | features = btrfs_super_incompat_flags(disk_super); | |
1865 | if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { | |
1866 | features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; | |
1867 | btrfs_set_super_incompat_flags(disk_super, features); | |
1868 | } | |
1869 | btrfs_end_transaction(trans, root); | |
1870 | ||
1871 | return 0; | |
1872 | } | |
1873 | ||
bf5fc093 JB |
1874 | static void get_block_group_info(struct list_head *groups_list, |
1875 | struct btrfs_ioctl_space_info *space) | |
1876 | { | |
1877 | struct btrfs_block_group_cache *block_group; | |
1878 | ||
1879 | space->total_bytes = 0; | |
1880 | space->used_bytes = 0; | |
1881 | space->flags = 0; | |
1882 | list_for_each_entry(block_group, groups_list, list) { | |
1883 | space->flags = block_group->flags; | |
1884 | space->total_bytes += block_group->key.offset; | |
1885 | space->used_bytes += | |
1886 | btrfs_block_group_used(&block_group->item); | |
1887 | } | |
1888 | } | |
1889 | ||
1406e432 JB |
1890 | long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) |
1891 | { | |
1892 | struct btrfs_ioctl_space_args space_args; | |
1893 | struct btrfs_ioctl_space_info space; | |
1894 | struct btrfs_ioctl_space_info *dest; | |
7fde62bf CM |
1895 | struct btrfs_ioctl_space_info *dest_orig; |
1896 | struct btrfs_ioctl_space_info *user_dest; | |
1406e432 | 1897 | struct btrfs_space_info *info; |
bf5fc093 JB |
1898 | u64 types[] = {BTRFS_BLOCK_GROUP_DATA, |
1899 | BTRFS_BLOCK_GROUP_SYSTEM, | |
1900 | BTRFS_BLOCK_GROUP_METADATA, | |
1901 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; | |
1902 | int num_types = 4; | |
7fde62bf | 1903 | int alloc_size; |
1406e432 | 1904 | int ret = 0; |
7fde62bf | 1905 | int slot_count = 0; |
bf5fc093 | 1906 | int i, c; |
1406e432 JB |
1907 | |
1908 | if (copy_from_user(&space_args, | |
1909 | (struct btrfs_ioctl_space_args __user *)arg, | |
1910 | sizeof(space_args))) | |
1911 | return -EFAULT; | |
1912 | ||
bf5fc093 JB |
1913 | for (i = 0; i < num_types; i++) { |
1914 | struct btrfs_space_info *tmp; | |
1915 | ||
1916 | info = NULL; | |
1917 | rcu_read_lock(); | |
1918 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
1919 | list) { | |
1920 | if (tmp->flags == types[i]) { | |
1921 | info = tmp; | |
1922 | break; | |
1923 | } | |
1924 | } | |
1925 | rcu_read_unlock(); | |
1926 | ||
1927 | if (!info) | |
1928 | continue; | |
1929 | ||
1930 | down_read(&info->groups_sem); | |
1931 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
1932 | if (!list_empty(&info->block_groups[c])) | |
1933 | slot_count++; | |
1934 | } | |
1935 | up_read(&info->groups_sem); | |
1936 | } | |
7fde62bf CM |
1937 | |
1938 | /* space_slots == 0 means they are asking for a count */ | |
1939 | if (space_args.space_slots == 0) { | |
1940 | space_args.total_spaces = slot_count; | |
1941 | goto out; | |
1942 | } | |
bf5fc093 JB |
1943 | |
1944 | slot_count = min_t(int, space_args.space_slots, slot_count); | |
1945 | ||
7fde62bf | 1946 | alloc_size = sizeof(*dest) * slot_count; |
bf5fc093 | 1947 | |
7fde62bf CM |
1948 | /* we generally have at most 6 or so space infos, one for each raid |
1949 | * level. So, a whole page should be more than enough for everyone | |
1950 | */ | |
1951 | if (alloc_size > PAGE_CACHE_SIZE) | |
1952 | return -ENOMEM; | |
1953 | ||
1406e432 | 1954 | space_args.total_spaces = 0; |
7fde62bf CM |
1955 | dest = kmalloc(alloc_size, GFP_NOFS); |
1956 | if (!dest) | |
1957 | return -ENOMEM; | |
1958 | dest_orig = dest; | |
1406e432 | 1959 | |
7fde62bf | 1960 | /* now we have a buffer to copy into */ |
bf5fc093 JB |
1961 | for (i = 0; i < num_types; i++) { |
1962 | struct btrfs_space_info *tmp; | |
1963 | ||
1964 | info = NULL; | |
1965 | rcu_read_lock(); | |
1966 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
1967 | list) { | |
1968 | if (tmp->flags == types[i]) { | |
1969 | info = tmp; | |
1970 | break; | |
1971 | } | |
1972 | } | |
1973 | rcu_read_unlock(); | |
7fde62bf | 1974 | |
bf5fc093 JB |
1975 | if (!info) |
1976 | continue; | |
1977 | down_read(&info->groups_sem); | |
1978 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
1979 | if (!list_empty(&info->block_groups[c])) { | |
1980 | get_block_group_info(&info->block_groups[c], | |
1981 | &space); | |
1982 | memcpy(dest, &space, sizeof(space)); | |
1983 | dest++; | |
1984 | space_args.total_spaces++; | |
1985 | } | |
1986 | } | |
1987 | up_read(&info->groups_sem); | |
1406e432 | 1988 | } |
1406e432 | 1989 | |
7fde62bf CM |
1990 | user_dest = (struct btrfs_ioctl_space_info *) |
1991 | (arg + sizeof(struct btrfs_ioctl_space_args)); | |
1992 | ||
1993 | if (copy_to_user(user_dest, dest_orig, alloc_size)) | |
1994 | ret = -EFAULT; | |
1995 | ||
1996 | kfree(dest_orig); | |
1997 | out: | |
1998 | if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) | |
1406e432 JB |
1999 | ret = -EFAULT; |
2000 | ||
2001 | return ret; | |
2002 | } | |
2003 | ||
f46b5a66 CH |
2004 | /* |
2005 | * there are many ways the trans_start and trans_end ioctls can lead | |
2006 | * to deadlocks. They should only be used by applications that | |
2007 | * basically own the machine, and have a very in depth understanding | |
2008 | * of all the possible deadlocks and enospc problems. | |
2009 | */ | |
2010 | long btrfs_ioctl_trans_end(struct file *file) | |
2011 | { | |
2012 | struct inode *inode = fdentry(file)->d_inode; | |
2013 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2014 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 2015 | |
f46b5a66 | 2016 | trans = file->private_data; |
1ab86aed SW |
2017 | if (!trans) |
2018 | return -EINVAL; | |
b214107e | 2019 | file->private_data = NULL; |
9ca9ee09 | 2020 | |
1ab86aed SW |
2021 | btrfs_end_transaction(trans, root); |
2022 | ||
9ca9ee09 SW |
2023 | mutex_lock(&root->fs_info->trans_mutex); |
2024 | root->fs_info->open_ioctl_trans--; | |
2025 | mutex_unlock(&root->fs_info->trans_mutex); | |
2026 | ||
cfc8ea87 | 2027 | mnt_drop_write(file->f_path.mnt); |
1ab86aed | 2028 | return 0; |
f46b5a66 CH |
2029 | } |
2030 | ||
2031 | long btrfs_ioctl(struct file *file, unsigned int | |
2032 | cmd, unsigned long arg) | |
2033 | { | |
2034 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; | |
4bcabaa3 | 2035 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
2036 | |
2037 | switch (cmd) { | |
6cbff00f CH |
2038 | case FS_IOC_GETFLAGS: |
2039 | return btrfs_ioctl_getflags(file, argp); | |
2040 | case FS_IOC_SETFLAGS: | |
2041 | return btrfs_ioctl_setflags(file, argp); | |
2042 | case FS_IOC_GETVERSION: | |
2043 | return btrfs_ioctl_getversion(file, argp); | |
f46b5a66 | 2044 | case BTRFS_IOC_SNAP_CREATE: |
4bcabaa3 | 2045 | return btrfs_ioctl_snap_create(file, argp, 0); |
3de4586c | 2046 | case BTRFS_IOC_SUBVOL_CREATE: |
4bcabaa3 | 2047 | return btrfs_ioctl_snap_create(file, argp, 1); |
76dda93c YZ |
2048 | case BTRFS_IOC_SNAP_DESTROY: |
2049 | return btrfs_ioctl_snap_destroy(file, argp); | |
6ef5ed0d JB |
2050 | case BTRFS_IOC_DEFAULT_SUBVOL: |
2051 | return btrfs_ioctl_default_subvol(file, argp); | |
f46b5a66 | 2052 | case BTRFS_IOC_DEFRAG: |
1e701a32 CM |
2053 | return btrfs_ioctl_defrag(file, NULL); |
2054 | case BTRFS_IOC_DEFRAG_RANGE: | |
2055 | return btrfs_ioctl_defrag(file, argp); | |
f46b5a66 | 2056 | case BTRFS_IOC_RESIZE: |
4bcabaa3 | 2057 | return btrfs_ioctl_resize(root, argp); |
f46b5a66 | 2058 | case BTRFS_IOC_ADD_DEV: |
4bcabaa3 | 2059 | return btrfs_ioctl_add_dev(root, argp); |
f46b5a66 | 2060 | case BTRFS_IOC_RM_DEV: |
4bcabaa3 | 2061 | return btrfs_ioctl_rm_dev(root, argp); |
f46b5a66 CH |
2062 | case BTRFS_IOC_BALANCE: |
2063 | return btrfs_balance(root->fs_info->dev_root); | |
2064 | case BTRFS_IOC_CLONE: | |
c5c9cd4d SW |
2065 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
2066 | case BTRFS_IOC_CLONE_RANGE: | |
7a865e8a | 2067 | return btrfs_ioctl_clone_range(file, argp); |
f46b5a66 CH |
2068 | case BTRFS_IOC_TRANS_START: |
2069 | return btrfs_ioctl_trans_start(file); | |
2070 | case BTRFS_IOC_TRANS_END: | |
2071 | return btrfs_ioctl_trans_end(file); | |
ac8e9819 CM |
2072 | case BTRFS_IOC_TREE_SEARCH: |
2073 | return btrfs_ioctl_tree_search(file, argp); | |
2074 | case BTRFS_IOC_INO_LOOKUP: | |
2075 | return btrfs_ioctl_ino_lookup(file, argp); | |
1406e432 JB |
2076 | case BTRFS_IOC_SPACE_INFO: |
2077 | return btrfs_ioctl_space_info(root, argp); | |
f46b5a66 CH |
2078 | case BTRFS_IOC_SYNC: |
2079 | btrfs_sync_fs(file->f_dentry->d_sb, 1); | |
2080 | return 0; | |
2081 | } | |
2082 | ||
2083 | return -ENOTTY; | |
2084 | } |