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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> | |
30 | #include <linux/smp_lock.h> | |
31 | #include <linux/backing-dev.h> | |
cb8e7090 | 32 | #include <linux/mount.h> |
f46b5a66 | 33 | #include <linux/mpage.h> |
cb8e7090 | 34 | #include <linux/namei.h> |
f46b5a66 CH |
35 | #include <linux/swap.h> |
36 | #include <linux/writeback.h> | |
37 | #include <linux/statfs.h> | |
38 | #include <linux/compat.h> | |
39 | #include <linux/bit_spinlock.h> | |
cb8e7090 | 40 | #include <linux/security.h> |
f46b5a66 | 41 | #include <linux/xattr.h> |
7ea394f1 | 42 | #include <linux/vmalloc.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; | |
234 | struct btrfs_root *new_root = root; | |
235 | struct inode *dir; | |
236 | int ret; | |
237 | int err; | |
238 | u64 objectid; | |
239 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
3de4586c | 240 | u64 index = 0; |
f46b5a66 CH |
241 | unsigned long nr = 1; |
242 | ||
6a63209f | 243 | ret = btrfs_check_metadata_free_space(root); |
f46b5a66 CH |
244 | if (ret) |
245 | goto fail_commit; | |
246 | ||
247 | trans = btrfs_start_transaction(root, 1); | |
248 | BUG_ON(!trans); | |
249 | ||
250 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
251 | 0, &objectid); | |
252 | if (ret) | |
253 | goto fail; | |
254 | ||
5d4f98a2 YZ |
255 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, |
256 | 0, objectid, NULL, 0, 0, 0); | |
8e8a1e31 JB |
257 | if (IS_ERR(leaf)) { |
258 | ret = PTR_ERR(leaf); | |
259 | goto fail; | |
260 | } | |
f46b5a66 | 261 | |
5d4f98a2 | 262 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
f46b5a66 CH |
263 | btrfs_set_header_bytenr(leaf, leaf->start); |
264 | btrfs_set_header_generation(leaf, trans->transid); | |
5d4f98a2 | 265 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); |
f46b5a66 CH |
266 | btrfs_set_header_owner(leaf, objectid); |
267 | ||
268 | write_extent_buffer(leaf, root->fs_info->fsid, | |
269 | (unsigned long)btrfs_header_fsid(leaf), | |
270 | BTRFS_FSID_SIZE); | |
5d4f98a2 YZ |
271 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, |
272 | (unsigned long)btrfs_header_chunk_tree_uuid(leaf), | |
273 | BTRFS_UUID_SIZE); | |
f46b5a66 CH |
274 | btrfs_mark_buffer_dirty(leaf); |
275 | ||
276 | inode_item = &root_item.inode; | |
277 | memset(inode_item, 0, sizeof(*inode_item)); | |
278 | inode_item->generation = cpu_to_le64(1); | |
279 | inode_item->size = cpu_to_le64(3); | |
280 | inode_item->nlink = cpu_to_le32(1); | |
a76a3cd4 | 281 | inode_item->nbytes = cpu_to_le64(root->leafsize); |
f46b5a66 CH |
282 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); |
283 | ||
284 | btrfs_set_root_bytenr(&root_item, leaf->start); | |
84234f3a | 285 | btrfs_set_root_generation(&root_item, trans->transid); |
f46b5a66 CH |
286 | btrfs_set_root_level(&root_item, 0); |
287 | btrfs_set_root_refs(&root_item, 1); | |
288 | btrfs_set_root_used(&root_item, 0); | |
80ff3856 | 289 | btrfs_set_root_last_snapshot(&root_item, 0); |
f46b5a66 CH |
290 | |
291 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); | |
292 | root_item.drop_level = 0; | |
293 | ||
925baedd | 294 | btrfs_tree_unlock(leaf); |
f46b5a66 CH |
295 | free_extent_buffer(leaf); |
296 | leaf = NULL; | |
297 | ||
298 | btrfs_set_root_dirid(&root_item, new_dirid); | |
299 | ||
300 | key.objectid = objectid; | |
5d4f98a2 | 301 | key.offset = 0; |
f46b5a66 CH |
302 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
303 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
304 | &root_item); | |
305 | if (ret) | |
306 | goto fail; | |
307 | ||
308 | /* | |
309 | * insert the directory item | |
310 | */ | |
311 | key.offset = (u64)-1; | |
3de4586c CM |
312 | dir = dentry->d_parent->d_inode; |
313 | ret = btrfs_set_inode_index(dir, &index); | |
314 | BUG_ON(ret); | |
315 | ||
316 | ret = btrfs_insert_dir_item(trans, root, | |
f46b5a66 | 317 | name, namelen, dir->i_ino, &key, |
3de4586c | 318 | BTRFS_FT_DIR, index); |
f46b5a66 CH |
319 | if (ret) |
320 | goto fail; | |
0660b5af | 321 | |
52c26179 YZ |
322 | btrfs_i_size_write(dir, dir->i_size + namelen * 2); |
323 | ret = btrfs_update_inode(trans, root, dir); | |
324 | BUG_ON(ret); | |
325 | ||
0660b5af CM |
326 | /* add the backref first */ |
327 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, | |
328 | objectid, BTRFS_ROOT_BACKREF_KEY, | |
329 | root->root_key.objectid, | |
330 | dir->i_ino, index, name, namelen); | |
331 | ||
332 | BUG_ON(ret); | |
333 | ||
334 | /* now add the forward ref */ | |
335 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, | |
336 | root->root_key.objectid, BTRFS_ROOT_REF_KEY, | |
337 | objectid, | |
338 | dir->i_ino, index, name, namelen); | |
339 | ||
340 | BUG_ON(ret); | |
341 | ||
f46b5a66 CH |
342 | ret = btrfs_commit_transaction(trans, root); |
343 | if (ret) | |
344 | goto fail_commit; | |
345 | ||
3de4586c | 346 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); |
f46b5a66 CH |
347 | BUG_ON(!new_root); |
348 | ||
349 | trans = btrfs_start_transaction(new_root, 1); | |
350 | BUG_ON(!trans); | |
351 | ||
d2fb3437 | 352 | ret = btrfs_create_subvol_root(trans, new_root, dentry, new_dirid, |
f46b5a66 CH |
353 | BTRFS_I(dir)->block_group); |
354 | if (ret) | |
355 | goto fail; | |
356 | ||
f46b5a66 CH |
357 | fail: |
358 | nr = trans->blocks_used; | |
359 | err = btrfs_commit_transaction(trans, new_root); | |
360 | if (err && !ret) | |
361 | ret = err; | |
362 | fail_commit: | |
f46b5a66 | 363 | btrfs_btree_balance_dirty(root, nr); |
f46b5a66 CH |
364 | return ret; |
365 | } | |
366 | ||
3de4586c CM |
367 | static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, |
368 | char *name, int namelen) | |
f46b5a66 CH |
369 | { |
370 | struct btrfs_pending_snapshot *pending_snapshot; | |
371 | struct btrfs_trans_handle *trans; | |
3de4586c | 372 | int ret = 0; |
f46b5a66 CH |
373 | int err; |
374 | unsigned long nr = 0; | |
375 | ||
376 | if (!root->ref_cows) | |
377 | return -EINVAL; | |
378 | ||
6a63209f | 379 | ret = btrfs_check_metadata_free_space(root); |
f46b5a66 CH |
380 | if (ret) |
381 | goto fail_unlock; | |
382 | ||
3de4586c | 383 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
f46b5a66 CH |
384 | if (!pending_snapshot) { |
385 | ret = -ENOMEM; | |
386 | goto fail_unlock; | |
387 | } | |
388 | pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); | |
389 | if (!pending_snapshot->name) { | |
390 | ret = -ENOMEM; | |
391 | kfree(pending_snapshot); | |
392 | goto fail_unlock; | |
393 | } | |
394 | memcpy(pending_snapshot->name, name, namelen); | |
395 | pending_snapshot->name[namelen] = '\0'; | |
3de4586c | 396 | pending_snapshot->dentry = dentry; |
f46b5a66 CH |
397 | trans = btrfs_start_transaction(root, 1); |
398 | BUG_ON(!trans); | |
399 | pending_snapshot->root = root; | |
400 | list_add(&pending_snapshot->list, | |
401 | &trans->transaction->pending_snapshots); | |
f46b5a66 CH |
402 | err = btrfs_commit_transaction(trans, root); |
403 | ||
404 | fail_unlock: | |
f46b5a66 | 405 | btrfs_btree_balance_dirty(root, nr); |
f46b5a66 CH |
406 | return ret; |
407 | } | |
408 | ||
cb8e7090 CH |
409 | /* copy of may_create in fs/namei.c() */ |
410 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
411 | { | |
412 | if (child->d_inode) | |
413 | return -EEXIST; | |
414 | if (IS_DEADDIR(dir)) | |
415 | return -ENOENT; | |
416 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
417 | } | |
418 | ||
419 | /* | |
420 | * Create a new subvolume below @parent. This is largely modeled after | |
421 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
422 | * inside this filesystem so it's quite a bit simpler. | |
423 | */ | |
424 | static noinline int btrfs_mksubvol(struct path *parent, char *name, | |
3de4586c CM |
425 | int mode, int namelen, |
426 | struct btrfs_root *snap_src) | |
cb8e7090 CH |
427 | { |
428 | struct dentry *dentry; | |
429 | int error; | |
430 | ||
431 | mutex_lock_nested(&parent->dentry->d_inode->i_mutex, I_MUTEX_PARENT); | |
432 | ||
433 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
434 | error = PTR_ERR(dentry); | |
435 | if (IS_ERR(dentry)) | |
436 | goto out_unlock; | |
437 | ||
438 | error = -EEXIST; | |
439 | if (dentry->d_inode) | |
440 | goto out_dput; | |
441 | ||
442 | if (!IS_POSIXACL(parent->dentry->d_inode)) | |
ce3b0f8d | 443 | mode &= ~current_umask(); |
3de4586c | 444 | |
cb8e7090 CH |
445 | error = mnt_want_write(parent->mnt); |
446 | if (error) | |
447 | goto out_dput; | |
448 | ||
449 | error = btrfs_may_create(parent->dentry->d_inode, dentry); | |
450 | if (error) | |
451 | goto out_drop_write; | |
452 | ||
cb8e7090 CH |
453 | /* |
454 | * Actually perform the low-level subvolume creation after all | |
455 | * this VFS fuzz. | |
456 | * | |
457 | * Eventually we want to pass in an inode under which we create this | |
458 | * subvolume, but for now all are under the filesystem root. | |
459 | * | |
460 | * Also we should pass on the mode eventually to allow creating new | |
461 | * subvolume with specific mode bits. | |
462 | */ | |
3de4586c | 463 | if (snap_src) { |
ea9e8b11 CM |
464 | struct dentry *dir = dentry->d_parent; |
465 | struct dentry *test = dir->d_parent; | |
466 | struct btrfs_path *path = btrfs_alloc_path(); | |
467 | int ret; | |
468 | u64 test_oid; | |
469 | u64 parent_oid = BTRFS_I(dir->d_inode)->root->root_key.objectid; | |
470 | ||
471 | test_oid = snap_src->root_key.objectid; | |
472 | ||
473 | ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, | |
474 | path, parent_oid, test_oid); | |
475 | if (ret == 0) | |
476 | goto create; | |
477 | btrfs_release_path(snap_src->fs_info->tree_root, path); | |
478 | ||
479 | /* we need to make sure we aren't creating a directory loop | |
480 | * by taking a snapshot of something that has our current | |
481 | * subvol in its directory tree. So, this loops through | |
482 | * the dentries and checks the forward refs for each subvolume | |
483 | * to see if is references the subvolume where we are | |
484 | * placing this new snapshot. | |
485 | */ | |
d397712b | 486 | while (1) { |
ea9e8b11 CM |
487 | if (!test || |
488 | dir == snap_src->fs_info->sb->s_root || | |
489 | test == snap_src->fs_info->sb->s_root || | |
490 | test->d_inode->i_sb != snap_src->fs_info->sb) { | |
491 | break; | |
492 | } | |
493 | if (S_ISLNK(test->d_inode->i_mode)) { | |
d397712b CM |
494 | printk(KERN_INFO "Btrfs symlink in snapshot " |
495 | "path, failed\n"); | |
ea9e8b11 CM |
496 | error = -EMLINK; |
497 | btrfs_free_path(path); | |
498 | goto out_drop_write; | |
499 | } | |
500 | test_oid = | |
501 | BTRFS_I(test->d_inode)->root->root_key.objectid; | |
502 | ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, | |
503 | path, test_oid, parent_oid); | |
504 | if (ret == 0) { | |
d397712b CM |
505 | printk(KERN_INFO "Btrfs snapshot creation " |
506 | "failed, looping\n"); | |
ea9e8b11 CM |
507 | error = -EMLINK; |
508 | btrfs_free_path(path); | |
509 | goto out_drop_write; | |
510 | } | |
511 | btrfs_release_path(snap_src->fs_info->tree_root, path); | |
512 | test = test->d_parent; | |
513 | } | |
514 | create: | |
515 | btrfs_free_path(path); | |
3de4586c CM |
516 | error = create_snapshot(snap_src, dentry, name, namelen); |
517 | } else { | |
518 | error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root, | |
519 | dentry, name, namelen); | |
520 | } | |
cb8e7090 CH |
521 | if (error) |
522 | goto out_drop_write; | |
523 | ||
524 | fsnotify_mkdir(parent->dentry->d_inode, dentry); | |
525 | out_drop_write: | |
526 | mnt_drop_write(parent->mnt); | |
527 | out_dput: | |
528 | dput(dentry); | |
529 | out_unlock: | |
530 | mutex_unlock(&parent->dentry->d_inode->i_mutex); | |
531 | return error; | |
532 | } | |
533 | ||
534 | ||
b2950863 | 535 | static int btrfs_defrag_file(struct file *file) |
f46b5a66 CH |
536 | { |
537 | struct inode *inode = fdentry(file)->d_inode; | |
538 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
539 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
3eaa2885 | 540 | struct btrfs_ordered_extent *ordered; |
f46b5a66 CH |
541 | struct page *page; |
542 | unsigned long last_index; | |
543 | unsigned long ra_pages = root->fs_info->bdi.ra_pages; | |
544 | unsigned long total_read = 0; | |
545 | u64 page_start; | |
546 | u64 page_end; | |
547 | unsigned long i; | |
548 | int ret; | |
549 | ||
6a63209f | 550 | ret = btrfs_check_data_free_space(root, inode, inode->i_size); |
f46b5a66 CH |
551 | if (ret) |
552 | return -ENOSPC; | |
553 | ||
554 | mutex_lock(&inode->i_mutex); | |
555 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
556 | for (i = 0; i <= last_index; i++) { | |
557 | if (total_read % ra_pages == 0) { | |
558 | btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, | |
559 | min(last_index, i + ra_pages - 1)); | |
560 | } | |
561 | total_read++; | |
3eaa2885 | 562 | again: |
f46b5a66 CH |
563 | page = grab_cache_page(inode->i_mapping, i); |
564 | if (!page) | |
565 | goto out_unlock; | |
566 | if (!PageUptodate(page)) { | |
567 | btrfs_readpage(NULL, page); | |
568 | lock_page(page); | |
569 | if (!PageUptodate(page)) { | |
570 | unlock_page(page); | |
571 | page_cache_release(page); | |
572 | goto out_unlock; | |
573 | } | |
574 | } | |
575 | ||
f46b5a66 | 576 | wait_on_page_writeback(page); |
f46b5a66 CH |
577 | |
578 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; | |
579 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
f46b5a66 | 580 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
3eaa2885 CM |
581 | |
582 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
583 | if (ordered) { | |
584 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
585 | unlock_page(page); | |
586 | page_cache_release(page); | |
587 | btrfs_start_ordered_extent(inode, ordered, 1); | |
588 | btrfs_put_ordered_extent(ordered); | |
589 | goto again; | |
590 | } | |
591 | set_page_extent_mapped(page); | |
592 | ||
f87f057b CM |
593 | /* |
594 | * this makes sure page_mkwrite is called on the | |
595 | * page if it is dirtied again later | |
596 | */ | |
597 | clear_page_dirty_for_io(page); | |
598 | ||
ea8c2819 | 599 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
f46b5a66 CH |
600 | |
601 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
602 | set_page_dirty(page); | |
603 | unlock_page(page); | |
604 | page_cache_release(page); | |
605 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
606 | } | |
607 | ||
608 | out_unlock: | |
609 | mutex_unlock(&inode->i_mutex); | |
610 | return 0; | |
611 | } | |
612 | ||
f46b5a66 CH |
613 | static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) |
614 | { | |
615 | u64 new_size; | |
616 | u64 old_size; | |
617 | u64 devid = 1; | |
618 | struct btrfs_ioctl_vol_args *vol_args; | |
619 | struct btrfs_trans_handle *trans; | |
620 | struct btrfs_device *device = NULL; | |
621 | char *sizestr; | |
622 | char *devstr = NULL; | |
623 | int ret = 0; | |
624 | int namelen; | |
625 | int mod = 0; | |
626 | ||
c146afad YZ |
627 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
628 | return -EROFS; | |
629 | ||
e441d54d CM |
630 | if (!capable(CAP_SYS_ADMIN)) |
631 | return -EPERM; | |
632 | ||
dae7b665 LZ |
633 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
634 | if (IS_ERR(vol_args)) | |
635 | return PTR_ERR(vol_args); | |
5516e595 MF |
636 | |
637 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 638 | namelen = strlen(vol_args->name); |
f46b5a66 | 639 | |
7d9eb12c | 640 | mutex_lock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
641 | sizestr = vol_args->name; |
642 | devstr = strchr(sizestr, ':'); | |
643 | if (devstr) { | |
644 | char *end; | |
645 | sizestr = devstr + 1; | |
646 | *devstr = '\0'; | |
647 | devstr = vol_args->name; | |
648 | devid = simple_strtoull(devstr, &end, 10); | |
21380931 JB |
649 | printk(KERN_INFO "resizing devid %llu\n", |
650 | (unsigned long long)devid); | |
f46b5a66 | 651 | } |
2b82032c | 652 | device = btrfs_find_device(root, devid, NULL, NULL); |
f46b5a66 | 653 | if (!device) { |
21380931 JB |
654 | printk(KERN_INFO "resizer unable to find device %llu\n", |
655 | (unsigned long long)devid); | |
f46b5a66 CH |
656 | ret = -EINVAL; |
657 | goto out_unlock; | |
658 | } | |
659 | if (!strcmp(sizestr, "max")) | |
660 | new_size = device->bdev->bd_inode->i_size; | |
661 | else { | |
662 | if (sizestr[0] == '-') { | |
663 | mod = -1; | |
664 | sizestr++; | |
665 | } else if (sizestr[0] == '+') { | |
666 | mod = 1; | |
667 | sizestr++; | |
668 | } | |
669 | new_size = btrfs_parse_size(sizestr); | |
670 | if (new_size == 0) { | |
671 | ret = -EINVAL; | |
672 | goto out_unlock; | |
673 | } | |
674 | } | |
675 | ||
676 | old_size = device->total_bytes; | |
677 | ||
678 | if (mod < 0) { | |
679 | if (new_size > old_size) { | |
680 | ret = -EINVAL; | |
681 | goto out_unlock; | |
682 | } | |
683 | new_size = old_size - new_size; | |
684 | } else if (mod > 0) { | |
685 | new_size = old_size + new_size; | |
686 | } | |
687 | ||
688 | if (new_size < 256 * 1024 * 1024) { | |
689 | ret = -EINVAL; | |
690 | goto out_unlock; | |
691 | } | |
692 | if (new_size > device->bdev->bd_inode->i_size) { | |
693 | ret = -EFBIG; | |
694 | goto out_unlock; | |
695 | } | |
696 | ||
697 | do_div(new_size, root->sectorsize); | |
698 | new_size *= root->sectorsize; | |
699 | ||
700 | printk(KERN_INFO "new size for %s is %llu\n", | |
701 | device->name, (unsigned long long)new_size); | |
702 | ||
703 | if (new_size > old_size) { | |
704 | trans = btrfs_start_transaction(root, 1); | |
705 | ret = btrfs_grow_device(trans, device, new_size); | |
706 | btrfs_commit_transaction(trans, root); | |
707 | } else { | |
708 | ret = btrfs_shrink_device(device, new_size); | |
709 | } | |
710 | ||
711 | out_unlock: | |
7d9eb12c | 712 | mutex_unlock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
713 | kfree(vol_args); |
714 | return ret; | |
715 | } | |
716 | ||
cb8e7090 | 717 | static noinline int btrfs_ioctl_snap_create(struct file *file, |
3de4586c | 718 | void __user *arg, int subvol) |
f46b5a66 | 719 | { |
cb8e7090 | 720 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
f46b5a66 CH |
721 | struct btrfs_ioctl_vol_args *vol_args; |
722 | struct btrfs_dir_item *di; | |
723 | struct btrfs_path *path; | |
3de4586c | 724 | struct file *src_file; |
f46b5a66 CH |
725 | u64 root_dirid; |
726 | int namelen; | |
3de4586c | 727 | int ret = 0; |
f46b5a66 | 728 | |
c146afad YZ |
729 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
730 | return -EROFS; | |
731 | ||
dae7b665 LZ |
732 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
733 | if (IS_ERR(vol_args)) | |
734 | return PTR_ERR(vol_args); | |
f46b5a66 | 735 | |
5516e595 | 736 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 | 737 | namelen = strlen(vol_args->name); |
f46b5a66 CH |
738 | if (strchr(vol_args->name, '/')) { |
739 | ret = -EINVAL; | |
740 | goto out; | |
741 | } | |
742 | ||
743 | path = btrfs_alloc_path(); | |
744 | if (!path) { | |
745 | ret = -ENOMEM; | |
746 | goto out; | |
747 | } | |
748 | ||
749 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
f46b5a66 CH |
750 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, |
751 | path, root_dirid, | |
752 | vol_args->name, namelen, 0); | |
f46b5a66 CH |
753 | btrfs_free_path(path); |
754 | ||
755 | if (di && !IS_ERR(di)) { | |
756 | ret = -EEXIST; | |
757 | goto out; | |
758 | } | |
759 | ||
760 | if (IS_ERR(di)) { | |
761 | ret = PTR_ERR(di); | |
762 | goto out; | |
763 | } | |
764 | ||
3de4586c | 765 | if (subvol) { |
cb8e7090 CH |
766 | ret = btrfs_mksubvol(&file->f_path, vol_args->name, |
767 | file->f_path.dentry->d_inode->i_mode, | |
3de4586c | 768 | namelen, NULL); |
cb8e7090 | 769 | } else { |
3de4586c CM |
770 | struct inode *src_inode; |
771 | src_file = fget(vol_args->fd); | |
772 | if (!src_file) { | |
773 | ret = -EINVAL; | |
774 | goto out; | |
775 | } | |
776 | ||
777 | src_inode = src_file->f_path.dentry->d_inode; | |
778 | if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { | |
d397712b CM |
779 | printk(KERN_INFO "btrfs: Snapshot src from " |
780 | "another FS\n"); | |
3de4586c CM |
781 | ret = -EINVAL; |
782 | fput(src_file); | |
783 | goto out; | |
784 | } | |
785 | ret = btrfs_mksubvol(&file->f_path, vol_args->name, | |
786 | file->f_path.dentry->d_inode->i_mode, | |
787 | namelen, BTRFS_I(src_inode)->root); | |
788 | fput(src_file); | |
cb8e7090 CH |
789 | } |
790 | ||
f46b5a66 CH |
791 | out: |
792 | kfree(vol_args); | |
793 | return ret; | |
794 | } | |
795 | ||
796 | static int btrfs_ioctl_defrag(struct file *file) | |
797 | { | |
798 | struct inode *inode = fdentry(file)->d_inode; | |
799 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
c146afad YZ |
800 | int ret; |
801 | ||
802 | ret = mnt_want_write(file->f_path.mnt); | |
803 | if (ret) | |
804 | return ret; | |
f46b5a66 CH |
805 | |
806 | switch (inode->i_mode & S_IFMT) { | |
807 | case S_IFDIR: | |
e441d54d CM |
808 | if (!capable(CAP_SYS_ADMIN)) { |
809 | ret = -EPERM; | |
810 | goto out; | |
811 | } | |
f46b5a66 CH |
812 | btrfs_defrag_root(root, 0); |
813 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
f46b5a66 CH |
814 | break; |
815 | case S_IFREG: | |
e441d54d CM |
816 | if (!(file->f_mode & FMODE_WRITE)) { |
817 | ret = -EINVAL; | |
818 | goto out; | |
819 | } | |
f46b5a66 CH |
820 | btrfs_defrag_file(file); |
821 | break; | |
822 | } | |
e441d54d | 823 | out: |
ab67b7c1 | 824 | mnt_drop_write(file->f_path.mnt); |
e441d54d | 825 | return ret; |
f46b5a66 CH |
826 | } |
827 | ||
b2950863 | 828 | static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
829 | { |
830 | struct btrfs_ioctl_vol_args *vol_args; | |
831 | int ret; | |
832 | ||
e441d54d CM |
833 | if (!capable(CAP_SYS_ADMIN)) |
834 | return -EPERM; | |
835 | ||
dae7b665 LZ |
836 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
837 | if (IS_ERR(vol_args)) | |
838 | return PTR_ERR(vol_args); | |
f46b5a66 | 839 | |
5516e595 | 840 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
841 | ret = btrfs_init_new_device(root, vol_args->name); |
842 | ||
f46b5a66 CH |
843 | kfree(vol_args); |
844 | return ret; | |
845 | } | |
846 | ||
b2950863 | 847 | static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
848 | { |
849 | struct btrfs_ioctl_vol_args *vol_args; | |
850 | int ret; | |
851 | ||
e441d54d CM |
852 | if (!capable(CAP_SYS_ADMIN)) |
853 | return -EPERM; | |
854 | ||
c146afad YZ |
855 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
856 | return -EROFS; | |
857 | ||
dae7b665 LZ |
858 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
859 | if (IS_ERR(vol_args)) | |
860 | return PTR_ERR(vol_args); | |
f46b5a66 | 861 | |
5516e595 | 862 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
863 | ret = btrfs_rm_device(root, vol_args->name); |
864 | ||
f46b5a66 CH |
865 | kfree(vol_args); |
866 | return ret; | |
867 | } | |
868 | ||
b2950863 CH |
869 | static long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, |
870 | u64 off, u64 olen, u64 destoff) | |
f46b5a66 CH |
871 | { |
872 | struct inode *inode = fdentry(file)->d_inode; | |
873 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
874 | struct file *src_file; | |
875 | struct inode *src; | |
876 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 877 | struct btrfs_path *path; |
f46b5a66 | 878 | struct extent_buffer *leaf; |
ae01a0ab YZ |
879 | char *buf; |
880 | struct btrfs_key key; | |
f46b5a66 CH |
881 | u32 nritems; |
882 | int slot; | |
ae01a0ab | 883 | int ret; |
c5c9cd4d SW |
884 | u64 len = olen; |
885 | u64 bs = root->fs_info->sb->s_blocksize; | |
886 | u64 hint_byte; | |
d20f7043 | 887 | |
c5c9cd4d SW |
888 | /* |
889 | * TODO: | |
890 | * - split compressed inline extents. annoying: we need to | |
891 | * decompress into destination's address_space (the file offset | |
892 | * may change, so source mapping won't do), then recompress (or | |
893 | * otherwise reinsert) a subrange. | |
894 | * - allow ranges within the same file to be cloned (provided | |
895 | * they don't overlap)? | |
896 | */ | |
897 | ||
e441d54d CM |
898 | /* the destination must be opened for writing */ |
899 | if (!(file->f_mode & FMODE_WRITE)) | |
900 | return -EINVAL; | |
901 | ||
c146afad YZ |
902 | ret = mnt_want_write(file->f_path.mnt); |
903 | if (ret) | |
904 | return ret; | |
905 | ||
c5c9cd4d | 906 | src_file = fget(srcfd); |
ab67b7c1 YZ |
907 | if (!src_file) { |
908 | ret = -EBADF; | |
909 | goto out_drop_write; | |
910 | } | |
f46b5a66 CH |
911 | src = src_file->f_dentry->d_inode; |
912 | ||
c5c9cd4d SW |
913 | ret = -EINVAL; |
914 | if (src == inode) | |
915 | goto out_fput; | |
916 | ||
ae01a0ab YZ |
917 | ret = -EISDIR; |
918 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) | |
919 | goto out_fput; | |
920 | ||
f46b5a66 | 921 | ret = -EXDEV; |
ae01a0ab YZ |
922 | if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) |
923 | goto out_fput; | |
924 | ||
925 | ret = -ENOMEM; | |
926 | buf = vmalloc(btrfs_level_size(root, 0)); | |
927 | if (!buf) | |
928 | goto out_fput; | |
929 | ||
930 | path = btrfs_alloc_path(); | |
931 | if (!path) { | |
932 | vfree(buf); | |
f46b5a66 | 933 | goto out_fput; |
ae01a0ab YZ |
934 | } |
935 | path->reada = 2; | |
f46b5a66 CH |
936 | |
937 | if (inode < src) { | |
938 | mutex_lock(&inode->i_mutex); | |
939 | mutex_lock(&src->i_mutex); | |
940 | } else { | |
941 | mutex_lock(&src->i_mutex); | |
942 | mutex_lock(&inode->i_mutex); | |
943 | } | |
944 | ||
c5c9cd4d SW |
945 | /* determine range to clone */ |
946 | ret = -EINVAL; | |
947 | if (off >= src->i_size || off + len > src->i_size) | |
f46b5a66 | 948 | goto out_unlock; |
c5c9cd4d SW |
949 | if (len == 0) |
950 | olen = len = src->i_size - off; | |
951 | /* if we extend to eof, continue to block boundary */ | |
952 | if (off + len == src->i_size) | |
953 | len = ((src->i_size + bs-1) & ~(bs-1)) | |
954 | - off; | |
955 | ||
956 | /* verify the end result is block aligned */ | |
957 | if ((off & (bs-1)) || | |
958 | ((off + len) & (bs-1))) | |
959 | goto out_unlock; | |
960 | ||
f46b5a66 CH |
961 | /* do any pending delalloc/csum calc on src, one way or |
962 | another, and lock file content */ | |
963 | while (1) { | |
31840ae1 | 964 | struct btrfs_ordered_extent *ordered; |
c5c9cd4d SW |
965 | lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
966 | ordered = btrfs_lookup_first_ordered_extent(inode, off+len); | |
ae01a0ab | 967 | if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) |
f46b5a66 | 968 | break; |
c5c9cd4d | 969 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
ae01a0ab YZ |
970 | if (ordered) |
971 | btrfs_put_ordered_extent(ordered); | |
c5c9cd4d | 972 | btrfs_wait_ordered_range(src, off, off+len); |
f46b5a66 CH |
973 | } |
974 | ||
ae01a0ab YZ |
975 | trans = btrfs_start_transaction(root, 1); |
976 | BUG_ON(!trans); | |
977 | ||
c5c9cd4d | 978 | /* punch hole in destination first */ |
e980b50c CM |
979 | btrfs_drop_extents(trans, root, inode, off, off + len, |
980 | off + len, 0, &hint_byte); | |
c5c9cd4d SW |
981 | |
982 | /* clone data */ | |
f46b5a66 | 983 | key.objectid = src->i_ino; |
ae01a0ab YZ |
984 | key.type = BTRFS_EXTENT_DATA_KEY; |
985 | key.offset = 0; | |
f46b5a66 CH |
986 | |
987 | while (1) { | |
988 | /* | |
989 | * note the key will change type as we walk through the | |
990 | * tree. | |
991 | */ | |
992 | ret = btrfs_search_slot(trans, root, &key, path, 0, 0); | |
993 | if (ret < 0) | |
994 | goto out; | |
995 | ||
ae01a0ab YZ |
996 | nritems = btrfs_header_nritems(path->nodes[0]); |
997 | if (path->slots[0] >= nritems) { | |
f46b5a66 CH |
998 | ret = btrfs_next_leaf(root, path); |
999 | if (ret < 0) | |
1000 | goto out; | |
1001 | if (ret > 0) | |
1002 | break; | |
ae01a0ab | 1003 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
1004 | } |
1005 | leaf = path->nodes[0]; | |
1006 | slot = path->slots[0]; | |
f46b5a66 | 1007 | |
ae01a0ab | 1008 | btrfs_item_key_to_cpu(leaf, &key, slot); |
d20f7043 | 1009 | if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || |
f46b5a66 CH |
1010 | key.objectid != src->i_ino) |
1011 | break; | |
1012 | ||
c5c9cd4d SW |
1013 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
1014 | struct btrfs_file_extent_item *extent; | |
1015 | int type; | |
31840ae1 ZY |
1016 | u32 size; |
1017 | struct btrfs_key new_key; | |
c5c9cd4d SW |
1018 | u64 disko = 0, diskl = 0; |
1019 | u64 datao = 0, datal = 0; | |
1020 | u8 comp; | |
31840ae1 ZY |
1021 | |
1022 | size = btrfs_item_size_nr(leaf, slot); | |
1023 | read_extent_buffer(leaf, buf, | |
1024 | btrfs_item_ptr_offset(leaf, slot), | |
1025 | size); | |
c5c9cd4d SW |
1026 | |
1027 | extent = btrfs_item_ptr(leaf, slot, | |
1028 | struct btrfs_file_extent_item); | |
1029 | comp = btrfs_file_extent_compression(leaf, extent); | |
1030 | type = btrfs_file_extent_type(leaf, extent); | |
c8a894d7 CM |
1031 | if (type == BTRFS_FILE_EXTENT_REG || |
1032 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d397712b CM |
1033 | disko = btrfs_file_extent_disk_bytenr(leaf, |
1034 | extent); | |
1035 | diskl = btrfs_file_extent_disk_num_bytes(leaf, | |
1036 | extent); | |
c5c9cd4d | 1037 | datao = btrfs_file_extent_offset(leaf, extent); |
d397712b CM |
1038 | datal = btrfs_file_extent_num_bytes(leaf, |
1039 | extent); | |
c5c9cd4d SW |
1040 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
1041 | /* take upper bound, may be compressed */ | |
1042 | datal = btrfs_file_extent_ram_bytes(leaf, | |
1043 | extent); | |
1044 | } | |
31840ae1 ZY |
1045 | btrfs_release_path(root, path); |
1046 | ||
c5c9cd4d SW |
1047 | if (key.offset + datal < off || |
1048 | key.offset >= off+len) | |
1049 | goto next; | |
1050 | ||
31840ae1 ZY |
1051 | memcpy(&new_key, &key, sizeof(new_key)); |
1052 | new_key.objectid = inode->i_ino; | |
c5c9cd4d | 1053 | new_key.offset = key.offset + destoff - off; |
31840ae1 | 1054 | |
c8a894d7 CM |
1055 | if (type == BTRFS_FILE_EXTENT_REG || |
1056 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
c5c9cd4d SW |
1057 | ret = btrfs_insert_empty_item(trans, root, path, |
1058 | &new_key, size); | |
1059 | if (ret) | |
1060 | goto out; | |
1061 | ||
1062 | leaf = path->nodes[0]; | |
1063 | slot = path->slots[0]; | |
1064 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
1065 | btrfs_item_ptr_offset(leaf, slot), |
1066 | size); | |
ae01a0ab | 1067 | |
c5c9cd4d | 1068 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 1069 | struct btrfs_file_extent_item); |
c5c9cd4d SW |
1070 | |
1071 | if (off > key.offset) { | |
1072 | datao += off - key.offset; | |
1073 | datal -= off - key.offset; | |
1074 | } | |
1075 | if (key.offset + datao + datal + key.offset > | |
1076 | off + len) | |
1077 | datal = off + len - key.offset - datao; | |
1078 | /* disko == 0 means it's a hole */ | |
1079 | if (!disko) | |
1080 | datao = 0; | |
c5c9cd4d SW |
1081 | |
1082 | btrfs_set_file_extent_offset(leaf, extent, | |
1083 | datao); | |
1084 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
1085 | datal); | |
1086 | if (disko) { | |
1087 | inode_add_bytes(inode, datal); | |
ae01a0ab | 1088 | ret = btrfs_inc_extent_ref(trans, root, |
5d4f98a2 YZ |
1089 | disko, diskl, 0, |
1090 | root->root_key.objectid, | |
1091 | inode->i_ino, | |
1092 | new_key.offset - datao); | |
31840ae1 | 1093 | BUG_ON(ret); |
f46b5a66 | 1094 | } |
c5c9cd4d SW |
1095 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
1096 | u64 skip = 0; | |
1097 | u64 trim = 0; | |
1098 | if (off > key.offset) { | |
1099 | skip = off - key.offset; | |
1100 | new_key.offset += skip; | |
1101 | } | |
d397712b | 1102 | |
c5c9cd4d SW |
1103 | if (key.offset + datal > off+len) |
1104 | trim = key.offset + datal - (off+len); | |
d397712b | 1105 | |
c5c9cd4d | 1106 | if (comp && (skip || trim)) { |
c5c9cd4d SW |
1107 | ret = -EINVAL; |
1108 | goto out; | |
1109 | } | |
1110 | size -= skip + trim; | |
1111 | datal -= skip + trim; | |
1112 | ret = btrfs_insert_empty_item(trans, root, path, | |
1113 | &new_key, size); | |
1114 | if (ret) | |
1115 | goto out; | |
1116 | ||
1117 | if (skip) { | |
d397712b CM |
1118 | u32 start = |
1119 | btrfs_file_extent_calc_inline_size(0); | |
c5c9cd4d SW |
1120 | memmove(buf+start, buf+start+skip, |
1121 | datal); | |
1122 | } | |
1123 | ||
1124 | leaf = path->nodes[0]; | |
1125 | slot = path->slots[0]; | |
1126 | write_extent_buffer(leaf, buf, | |
1127 | btrfs_item_ptr_offset(leaf, slot), | |
1128 | size); | |
1129 | inode_add_bytes(inode, datal); | |
f46b5a66 | 1130 | } |
c5c9cd4d SW |
1131 | |
1132 | btrfs_mark_buffer_dirty(leaf); | |
ae01a0ab | 1133 | } |
c5c9cd4d | 1134 | |
d397712b | 1135 | next: |
31840ae1 | 1136 | btrfs_release_path(root, path); |
f46b5a66 | 1137 | key.offset++; |
f46b5a66 | 1138 | } |
f46b5a66 CH |
1139 | ret = 0; |
1140 | out: | |
ae01a0ab YZ |
1141 | btrfs_release_path(root, path); |
1142 | if (ret == 0) { | |
1143 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
c5c9cd4d SW |
1144 | if (destoff + olen > inode->i_size) |
1145 | btrfs_i_size_write(inode, destoff + olen); | |
ae01a0ab YZ |
1146 | BTRFS_I(inode)->flags = BTRFS_I(src)->flags; |
1147 | ret = btrfs_update_inode(trans, root, inode); | |
1148 | } | |
f46b5a66 | 1149 | btrfs_end_transaction(trans, root); |
c5c9cd4d | 1150 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
ae01a0ab YZ |
1151 | if (ret) |
1152 | vmtruncate(inode, 0); | |
f46b5a66 CH |
1153 | out_unlock: |
1154 | mutex_unlock(&src->i_mutex); | |
1155 | mutex_unlock(&inode->i_mutex); | |
ae01a0ab YZ |
1156 | vfree(buf); |
1157 | btrfs_free_path(path); | |
f46b5a66 CH |
1158 | out_fput: |
1159 | fput(src_file); | |
ab67b7c1 YZ |
1160 | out_drop_write: |
1161 | mnt_drop_write(file->f_path.mnt); | |
f46b5a66 CH |
1162 | return ret; |
1163 | } | |
1164 | ||
7a865e8a | 1165 | static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) |
c5c9cd4d SW |
1166 | { |
1167 | struct btrfs_ioctl_clone_range_args args; | |
1168 | ||
7a865e8a | 1169 | if (copy_from_user(&args, argp, sizeof(args))) |
c5c9cd4d SW |
1170 | return -EFAULT; |
1171 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, | |
1172 | args.src_length, args.dest_offset); | |
1173 | } | |
1174 | ||
f46b5a66 CH |
1175 | /* |
1176 | * there are many ways the trans_start and trans_end ioctls can lead | |
1177 | * to deadlocks. They should only be used by applications that | |
1178 | * basically own the machine, and have a very in depth understanding | |
1179 | * of all the possible deadlocks and enospc problems. | |
1180 | */ | |
b2950863 | 1181 | static long btrfs_ioctl_trans_start(struct file *file) |
f46b5a66 CH |
1182 | { |
1183 | struct inode *inode = fdentry(file)->d_inode; | |
1184 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1185 | struct btrfs_trans_handle *trans; | |
1186 | int ret = 0; | |
1187 | ||
df5b5520 CH |
1188 | if (!capable(CAP_SYS_ADMIN)) |
1189 | return -EPERM; | |
1190 | ||
f46b5a66 CH |
1191 | if (file->private_data) { |
1192 | ret = -EINPROGRESS; | |
1193 | goto out; | |
1194 | } | |
9ca9ee09 | 1195 | |
c146afad YZ |
1196 | ret = mnt_want_write(file->f_path.mnt); |
1197 | if (ret) | |
1198 | goto out; | |
1199 | ||
9ca9ee09 SW |
1200 | mutex_lock(&root->fs_info->trans_mutex); |
1201 | root->fs_info->open_ioctl_trans++; | |
1202 | mutex_unlock(&root->fs_info->trans_mutex); | |
1203 | ||
1204 | trans = btrfs_start_ioctl_transaction(root, 0); | |
f46b5a66 CH |
1205 | if (trans) |
1206 | file->private_data = trans; | |
1207 | else | |
1208 | ret = -ENOMEM; | |
1209 | /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/ | |
1210 | out: | |
f46b5a66 CH |
1211 | return ret; |
1212 | } | |
1213 | ||
1214 | /* | |
1215 | * there are many ways the trans_start and trans_end ioctls can lead | |
1216 | * to deadlocks. They should only be used by applications that | |
1217 | * basically own the machine, and have a very in depth understanding | |
1218 | * of all the possible deadlocks and enospc problems. | |
1219 | */ | |
1220 | long btrfs_ioctl_trans_end(struct file *file) | |
1221 | { | |
1222 | struct inode *inode = fdentry(file)->d_inode; | |
1223 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1224 | struct btrfs_trans_handle *trans; | |
1225 | int ret = 0; | |
1226 | ||
f46b5a66 CH |
1227 | trans = file->private_data; |
1228 | if (!trans) { | |
1229 | ret = -EINVAL; | |
1230 | goto out; | |
1231 | } | |
1232 | btrfs_end_transaction(trans, root); | |
b214107e | 1233 | file->private_data = NULL; |
9ca9ee09 SW |
1234 | |
1235 | mutex_lock(&root->fs_info->trans_mutex); | |
1236 | root->fs_info->open_ioctl_trans--; | |
1237 | mutex_unlock(&root->fs_info->trans_mutex); | |
1238 | ||
cfc8ea87 SW |
1239 | mnt_drop_write(file->f_path.mnt); |
1240 | ||
f46b5a66 | 1241 | out: |
f46b5a66 CH |
1242 | return ret; |
1243 | } | |
1244 | ||
1245 | long btrfs_ioctl(struct file *file, unsigned int | |
1246 | cmd, unsigned long arg) | |
1247 | { | |
1248 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; | |
4bcabaa3 | 1249 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
1250 | |
1251 | switch (cmd) { | |
6cbff00f CH |
1252 | case FS_IOC_GETFLAGS: |
1253 | return btrfs_ioctl_getflags(file, argp); | |
1254 | case FS_IOC_SETFLAGS: | |
1255 | return btrfs_ioctl_setflags(file, argp); | |
1256 | case FS_IOC_GETVERSION: | |
1257 | return btrfs_ioctl_getversion(file, argp); | |
f46b5a66 | 1258 | case BTRFS_IOC_SNAP_CREATE: |
4bcabaa3 | 1259 | return btrfs_ioctl_snap_create(file, argp, 0); |
3de4586c | 1260 | case BTRFS_IOC_SUBVOL_CREATE: |
4bcabaa3 | 1261 | return btrfs_ioctl_snap_create(file, argp, 1); |
f46b5a66 CH |
1262 | case BTRFS_IOC_DEFRAG: |
1263 | return btrfs_ioctl_defrag(file); | |
1264 | case BTRFS_IOC_RESIZE: | |
4bcabaa3 | 1265 | return btrfs_ioctl_resize(root, argp); |
f46b5a66 | 1266 | case BTRFS_IOC_ADD_DEV: |
4bcabaa3 | 1267 | return btrfs_ioctl_add_dev(root, argp); |
f46b5a66 | 1268 | case BTRFS_IOC_RM_DEV: |
4bcabaa3 | 1269 | return btrfs_ioctl_rm_dev(root, argp); |
f46b5a66 CH |
1270 | case BTRFS_IOC_BALANCE: |
1271 | return btrfs_balance(root->fs_info->dev_root); | |
1272 | case BTRFS_IOC_CLONE: | |
c5c9cd4d SW |
1273 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
1274 | case BTRFS_IOC_CLONE_RANGE: | |
7a865e8a | 1275 | return btrfs_ioctl_clone_range(file, argp); |
f46b5a66 CH |
1276 | case BTRFS_IOC_TRANS_START: |
1277 | return btrfs_ioctl_trans_start(file); | |
1278 | case BTRFS_IOC_TRANS_END: | |
1279 | return btrfs_ioctl_trans_end(file); | |
1280 | case BTRFS_IOC_SYNC: | |
1281 | btrfs_sync_fs(file->f_dentry->d_sb, 1); | |
1282 | return 0; | |
1283 | } | |
1284 | ||
1285 | return -ENOTTY; | |
1286 | } |