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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> |
4b4e25f2 | 42 | #include "compat.h" |
f46b5a66 CH |
43 | #include "ctree.h" |
44 | #include "disk-io.h" | |
45 | #include "transaction.h" | |
46 | #include "btrfs_inode.h" | |
47 | #include "ioctl.h" | |
48 | #include "print-tree.h" | |
49 | #include "volumes.h" | |
925baedd | 50 | #include "locking.h" |
98d377a0 | 51 | #include "ctree.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 | |
9ed74f2d JB |
242 | /* |
243 | * 1 - inode item | |
244 | * 2 - refs | |
245 | * 1 - root item | |
246 | * 2 - dir items | |
247 | */ | |
248 | ret = btrfs_reserve_metadata_space(root, 6); | |
f46b5a66 | 249 | if (ret) |
76dda93c | 250 | return ret; |
f46b5a66 CH |
251 | |
252 | trans = btrfs_start_transaction(root, 1); | |
253 | BUG_ON(!trans); | |
254 | ||
255 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
256 | 0, &objectid); | |
257 | if (ret) | |
258 | goto fail; | |
259 | ||
5d4f98a2 YZ |
260 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, |
261 | 0, objectid, NULL, 0, 0, 0); | |
8e8a1e31 JB |
262 | if (IS_ERR(leaf)) { |
263 | ret = PTR_ERR(leaf); | |
264 | goto fail; | |
265 | } | |
f46b5a66 | 266 | |
5d4f98a2 | 267 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
f46b5a66 CH |
268 | btrfs_set_header_bytenr(leaf, leaf->start); |
269 | btrfs_set_header_generation(leaf, trans->transid); | |
5d4f98a2 | 270 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); |
f46b5a66 CH |
271 | btrfs_set_header_owner(leaf, objectid); |
272 | ||
273 | write_extent_buffer(leaf, root->fs_info->fsid, | |
274 | (unsigned long)btrfs_header_fsid(leaf), | |
275 | BTRFS_FSID_SIZE); | |
5d4f98a2 YZ |
276 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, |
277 | (unsigned long)btrfs_header_chunk_tree_uuid(leaf), | |
278 | BTRFS_UUID_SIZE); | |
f46b5a66 CH |
279 | btrfs_mark_buffer_dirty(leaf); |
280 | ||
281 | inode_item = &root_item.inode; | |
282 | memset(inode_item, 0, sizeof(*inode_item)); | |
283 | inode_item->generation = cpu_to_le64(1); | |
284 | inode_item->size = cpu_to_le64(3); | |
285 | inode_item->nlink = cpu_to_le32(1); | |
a76a3cd4 | 286 | inode_item->nbytes = cpu_to_le64(root->leafsize); |
f46b5a66 CH |
287 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); |
288 | ||
289 | btrfs_set_root_bytenr(&root_item, leaf->start); | |
84234f3a | 290 | btrfs_set_root_generation(&root_item, trans->transid); |
f46b5a66 CH |
291 | btrfs_set_root_level(&root_item, 0); |
292 | btrfs_set_root_refs(&root_item, 1); | |
86b9f2ec | 293 | btrfs_set_root_used(&root_item, leaf->len); |
80ff3856 | 294 | btrfs_set_root_last_snapshot(&root_item, 0); |
f46b5a66 CH |
295 | |
296 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); | |
297 | root_item.drop_level = 0; | |
298 | ||
925baedd | 299 | btrfs_tree_unlock(leaf); |
f46b5a66 CH |
300 | free_extent_buffer(leaf); |
301 | leaf = NULL; | |
302 | ||
303 | btrfs_set_root_dirid(&root_item, new_dirid); | |
304 | ||
305 | key.objectid = objectid; | |
5d4f98a2 | 306 | key.offset = 0; |
f46b5a66 CH |
307 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
308 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
309 | &root_item); | |
310 | if (ret) | |
311 | goto fail; | |
312 | ||
76dda93c YZ |
313 | key.offset = (u64)-1; |
314 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); | |
315 | BUG_ON(IS_ERR(new_root)); | |
316 | ||
317 | btrfs_record_root_in_trans(trans, new_root); | |
318 | ||
319 | ret = btrfs_create_subvol_root(trans, new_root, new_dirid, | |
320 | BTRFS_I(dir)->block_group); | |
f46b5a66 CH |
321 | /* |
322 | * insert the directory item | |
323 | */ | |
3de4586c CM |
324 | ret = btrfs_set_inode_index(dir, &index); |
325 | BUG_ON(ret); | |
326 | ||
327 | ret = btrfs_insert_dir_item(trans, root, | |
f46b5a66 | 328 | name, namelen, dir->i_ino, &key, |
3de4586c | 329 | BTRFS_FT_DIR, index); |
f46b5a66 CH |
330 | if (ret) |
331 | goto fail; | |
0660b5af | 332 | |
52c26179 YZ |
333 | btrfs_i_size_write(dir, dir->i_size + namelen * 2); |
334 | ret = btrfs_update_inode(trans, root, dir); | |
335 | BUG_ON(ret); | |
336 | ||
0660b5af | 337 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
4df27c4d | 338 | objectid, root->root_key.objectid, |
0660b5af | 339 | dir->i_ino, index, name, namelen); |
0660b5af | 340 | |
76dda93c | 341 | BUG_ON(ret); |
f46b5a66 | 342 | |
76dda93c | 343 | d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); |
f46b5a66 | 344 | fail: |
76dda93c | 345 | err = btrfs_commit_transaction(trans, root); |
f46b5a66 CH |
346 | if (err && !ret) |
347 | ret = err; | |
9ed74f2d JB |
348 | |
349 | btrfs_unreserve_metadata_space(root, 6); | |
f46b5a66 CH |
350 | return ret; |
351 | } | |
352 | ||
3de4586c CM |
353 | static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, |
354 | char *name, int namelen) | |
f46b5a66 | 355 | { |
2e4bfab9 | 356 | struct inode *inode; |
f46b5a66 CH |
357 | struct btrfs_pending_snapshot *pending_snapshot; |
358 | struct btrfs_trans_handle *trans; | |
2e4bfab9 | 359 | int ret; |
f46b5a66 CH |
360 | |
361 | if (!root->ref_cows) | |
362 | return -EINVAL; | |
363 | ||
9ed74f2d JB |
364 | /* |
365 | * 1 - inode item | |
366 | * 2 - refs | |
367 | * 1 - root item | |
368 | * 2 - dir items | |
369 | */ | |
370 | ret = btrfs_reserve_metadata_space(root, 6); | |
f46b5a66 | 371 | if (ret) |
2e4bfab9 | 372 | goto fail; |
f46b5a66 | 373 | |
3de4586c | 374 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
f46b5a66 CH |
375 | if (!pending_snapshot) { |
376 | ret = -ENOMEM; | |
9ed74f2d | 377 | btrfs_unreserve_metadata_space(root, 6); |
2e4bfab9 | 378 | goto fail; |
f46b5a66 CH |
379 | } |
380 | pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); | |
381 | if (!pending_snapshot->name) { | |
382 | ret = -ENOMEM; | |
383 | kfree(pending_snapshot); | |
9ed74f2d | 384 | btrfs_unreserve_metadata_space(root, 6); |
2e4bfab9 | 385 | goto fail; |
f46b5a66 CH |
386 | } |
387 | memcpy(pending_snapshot->name, name, namelen); | |
388 | pending_snapshot->name[namelen] = '\0'; | |
3de4586c | 389 | pending_snapshot->dentry = dentry; |
f46b5a66 CH |
390 | trans = btrfs_start_transaction(root, 1); |
391 | BUG_ON(!trans); | |
392 | pending_snapshot->root = root; | |
393 | list_add(&pending_snapshot->list, | |
394 | &trans->transaction->pending_snapshots); | |
2e4bfab9 YZ |
395 | ret = btrfs_commit_transaction(trans, root); |
396 | BUG_ON(ret); | |
397 | btrfs_unreserve_metadata_space(root, 6); | |
f46b5a66 | 398 | |
2e4bfab9 YZ |
399 | inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); |
400 | if (IS_ERR(inode)) { | |
401 | ret = PTR_ERR(inode); | |
402 | goto fail; | |
403 | } | |
404 | BUG_ON(!inode); | |
405 | d_instantiate(dentry, inode); | |
406 | ret = 0; | |
407 | fail: | |
f46b5a66 CH |
408 | return ret; |
409 | } | |
410 | ||
cb8e7090 CH |
411 | /* copy of may_create in fs/namei.c() */ |
412 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
413 | { | |
414 | if (child->d_inode) | |
415 | return -EEXIST; | |
416 | if (IS_DEADDIR(dir)) | |
417 | return -ENOENT; | |
418 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
419 | } | |
420 | ||
421 | /* | |
422 | * Create a new subvolume below @parent. This is largely modeled after | |
423 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
424 | * inside this filesystem so it's quite a bit simpler. | |
425 | */ | |
76dda93c YZ |
426 | static noinline int btrfs_mksubvol(struct path *parent, |
427 | char *name, int namelen, | |
3de4586c | 428 | struct btrfs_root *snap_src) |
cb8e7090 | 429 | { |
76dda93c | 430 | struct inode *dir = parent->dentry->d_inode; |
cb8e7090 CH |
431 | struct dentry *dentry; |
432 | int error; | |
433 | ||
76dda93c | 434 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
cb8e7090 CH |
435 | |
436 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
437 | error = PTR_ERR(dentry); | |
438 | if (IS_ERR(dentry)) | |
439 | goto out_unlock; | |
440 | ||
441 | error = -EEXIST; | |
442 | if (dentry->d_inode) | |
443 | goto out_dput; | |
444 | ||
cb8e7090 CH |
445 | error = mnt_want_write(parent->mnt); |
446 | if (error) | |
447 | goto out_dput; | |
448 | ||
76dda93c | 449 | error = btrfs_may_create(dir, dentry); |
cb8e7090 CH |
450 | if (error) |
451 | goto out_drop_write; | |
452 | ||
76dda93c YZ |
453 | down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); |
454 | ||
455 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) | |
456 | goto out_up_read; | |
457 | ||
3de4586c | 458 | if (snap_src) { |
76dda93c YZ |
459 | error = create_snapshot(snap_src, dentry, |
460 | name, namelen); | |
3de4586c | 461 | } else { |
76dda93c YZ |
462 | error = create_subvol(BTRFS_I(dir)->root, dentry, |
463 | name, namelen); | |
3de4586c | 464 | } |
76dda93c YZ |
465 | if (!error) |
466 | fsnotify_mkdir(dir, dentry); | |
467 | out_up_read: | |
468 | up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); | |
cb8e7090 CH |
469 | out_drop_write: |
470 | mnt_drop_write(parent->mnt); | |
471 | out_dput: | |
472 | dput(dentry); | |
473 | out_unlock: | |
76dda93c | 474 | mutex_unlock(&dir->i_mutex); |
cb8e7090 CH |
475 | return error; |
476 | } | |
477 | ||
940100a4 CM |
478 | static int should_defrag_range(struct inode *inode, u64 start, u64 len, |
479 | u64 *last_len, u64 *skip, u64 *defrag_end) | |
480 | { | |
481 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
482 | struct extent_map *em = NULL; | |
483 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
484 | int ret = 1; | |
485 | ||
486 | /* | |
487 | * make sure that once we start defragging and extent, we keep on | |
488 | * defragging it | |
489 | */ | |
490 | if (start < *defrag_end) | |
491 | return 1; | |
492 | ||
493 | *skip = 0; | |
494 | ||
495 | /* | |
496 | * hopefully we have this extent in the tree already, try without | |
497 | * the full extent lock | |
498 | */ | |
499 | read_lock(&em_tree->lock); | |
500 | em = lookup_extent_mapping(em_tree, start, len); | |
501 | read_unlock(&em_tree->lock); | |
502 | ||
503 | if (!em) { | |
504 | /* get the big lock and read metadata off disk */ | |
505 | lock_extent(io_tree, start, start + len - 1, GFP_NOFS); | |
506 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); | |
507 | unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); | |
508 | ||
509 | if (!em) | |
510 | return 0; | |
511 | } | |
512 | ||
513 | /* this will cover holes, and inline extents */ | |
514 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) | |
515 | ret = 0; | |
516 | ||
517 | /* | |
518 | * we hit a real extent, if it is big don't bother defragging it again | |
519 | */ | |
520 | if ((*last_len == 0 || *last_len >= 256 * 1024) && | |
521 | em->len >= 256 * 1024) | |
522 | ret = 0; | |
523 | ||
524 | /* | |
525 | * last_len ends up being a counter of how many bytes we've defragged. | |
526 | * every time we choose not to defrag an extent, we reset *last_len | |
527 | * so that the next tiny extent will force a defrag. | |
528 | * | |
529 | * The end result of this is that tiny extents before a single big | |
530 | * extent will force at least part of that big extent to be defragged. | |
531 | */ | |
532 | if (ret) { | |
533 | *last_len += len; | |
534 | *defrag_end = extent_map_end(em); | |
535 | } else { | |
536 | *last_len = 0; | |
537 | *skip = extent_map_end(em); | |
538 | *defrag_end = 0; | |
539 | } | |
540 | ||
541 | free_extent_map(em); | |
542 | return ret; | |
543 | } | |
544 | ||
b2950863 | 545 | static int btrfs_defrag_file(struct file *file) |
f46b5a66 CH |
546 | { |
547 | struct inode *inode = fdentry(file)->d_inode; | |
548 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
549 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
3eaa2885 | 550 | struct btrfs_ordered_extent *ordered; |
f46b5a66 CH |
551 | struct page *page; |
552 | unsigned long last_index; | |
553 | unsigned long ra_pages = root->fs_info->bdi.ra_pages; | |
554 | unsigned long total_read = 0; | |
555 | u64 page_start; | |
556 | u64 page_end; | |
940100a4 CM |
557 | u64 last_len = 0; |
558 | u64 skip = 0; | |
559 | u64 defrag_end = 0; | |
f46b5a66 CH |
560 | unsigned long i; |
561 | int ret; | |
562 | ||
940100a4 CM |
563 | if (inode->i_size == 0) |
564 | return 0; | |
565 | ||
566 | last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; | |
567 | i = 0; | |
568 | while (i <= last_index) { | |
569 | if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, | |
570 | PAGE_CACHE_SIZE, &last_len, &skip, | |
571 | &defrag_end)) { | |
572 | unsigned long next; | |
573 | /* | |
574 | * the should_defrag function tells us how much to skip | |
575 | * bump our counter by the suggested amount | |
576 | */ | |
577 | next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
578 | i = max(i + 1, next); | |
579 | continue; | |
580 | } | |
f46b5a66 | 581 | |
f46b5a66 CH |
582 | if (total_read % ra_pages == 0) { |
583 | btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, | |
584 | min(last_index, i + ra_pages - 1)); | |
585 | } | |
586 | total_read++; | |
940100a4 CM |
587 | mutex_lock(&inode->i_mutex); |
588 | ||
589 | ret = btrfs_check_data_free_space(root, inode, PAGE_CACHE_SIZE); | |
590 | if (ret) { | |
591 | ret = -ENOSPC; | |
592 | break; | |
593 | } | |
594 | ||
595 | ret = btrfs_reserve_metadata_for_delalloc(root, inode, 1); | |
596 | if (ret) { | |
597 | btrfs_free_reserved_data_space(root, inode, | |
598 | PAGE_CACHE_SIZE); | |
599 | ret = -ENOSPC; | |
600 | break; | |
601 | } | |
3eaa2885 | 602 | again: |
940100a4 CM |
603 | if (inode->i_size == 0 || |
604 | i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) { | |
605 | ret = 0; | |
606 | goto err_reservations; | |
607 | } | |
608 | ||
f46b5a66 CH |
609 | page = grab_cache_page(inode->i_mapping, i); |
610 | if (!page) | |
940100a4 CM |
611 | goto err_reservations; |
612 | ||
f46b5a66 CH |
613 | if (!PageUptodate(page)) { |
614 | btrfs_readpage(NULL, page); | |
615 | lock_page(page); | |
616 | if (!PageUptodate(page)) { | |
617 | unlock_page(page); | |
618 | page_cache_release(page); | |
940100a4 | 619 | goto err_reservations; |
f46b5a66 CH |
620 | } |
621 | } | |
622 | ||
940100a4 CM |
623 | if (page->mapping != inode->i_mapping) { |
624 | unlock_page(page); | |
625 | page_cache_release(page); | |
626 | goto again; | |
627 | } | |
628 | ||
f46b5a66 | 629 | wait_on_page_writeback(page); |
f46b5a66 | 630 | |
940100a4 CM |
631 | if (PageDirty(page)) { |
632 | btrfs_free_reserved_data_space(root, inode, | |
633 | PAGE_CACHE_SIZE); | |
634 | goto loop_unlock; | |
635 | } | |
636 | ||
f46b5a66 CH |
637 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
638 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
f46b5a66 | 639 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
3eaa2885 CM |
640 | |
641 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
642 | if (ordered) { | |
643 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
644 | unlock_page(page); | |
645 | page_cache_release(page); | |
646 | btrfs_start_ordered_extent(inode, ordered, 1); | |
647 | btrfs_put_ordered_extent(ordered); | |
648 | goto again; | |
649 | } | |
650 | set_page_extent_mapped(page); | |
651 | ||
f87f057b CM |
652 | /* |
653 | * this makes sure page_mkwrite is called on the | |
654 | * page if it is dirtied again later | |
655 | */ | |
656 | clear_page_dirty_for_io(page); | |
940100a4 CM |
657 | clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, |
658 | page_end, EXTENT_DIRTY | EXTENT_DELALLOC | | |
659 | EXTENT_DO_ACCOUNTING, GFP_NOFS); | |
f87f057b | 660 | |
ea8c2819 | 661 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
940100a4 | 662 | ClearPageChecked(page); |
f46b5a66 | 663 | set_page_dirty(page); |
a1ed835e | 664 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
940100a4 CM |
665 | |
666 | loop_unlock: | |
f46b5a66 CH |
667 | unlock_page(page); |
668 | page_cache_release(page); | |
940100a4 CM |
669 | mutex_unlock(&inode->i_mutex); |
670 | ||
671 | btrfs_unreserve_metadata_for_delalloc(root, inode, 1); | |
f46b5a66 | 672 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); |
940100a4 | 673 | i++; |
f46b5a66 CH |
674 | } |
675 | ||
f46b5a66 | 676 | return 0; |
940100a4 CM |
677 | |
678 | err_reservations: | |
679 | mutex_unlock(&inode->i_mutex); | |
680 | btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE); | |
681 | btrfs_unreserve_metadata_for_delalloc(root, inode, 1); | |
682 | return ret; | |
f46b5a66 CH |
683 | } |
684 | ||
76dda93c YZ |
685 | static noinline int btrfs_ioctl_resize(struct btrfs_root *root, |
686 | void __user *arg) | |
f46b5a66 CH |
687 | { |
688 | u64 new_size; | |
689 | u64 old_size; | |
690 | u64 devid = 1; | |
691 | struct btrfs_ioctl_vol_args *vol_args; | |
692 | struct btrfs_trans_handle *trans; | |
693 | struct btrfs_device *device = NULL; | |
694 | char *sizestr; | |
695 | char *devstr = NULL; | |
696 | int ret = 0; | |
697 | int namelen; | |
698 | int mod = 0; | |
699 | ||
c146afad YZ |
700 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
701 | return -EROFS; | |
702 | ||
e441d54d CM |
703 | if (!capable(CAP_SYS_ADMIN)) |
704 | return -EPERM; | |
705 | ||
dae7b665 LZ |
706 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
707 | if (IS_ERR(vol_args)) | |
708 | return PTR_ERR(vol_args); | |
5516e595 MF |
709 | |
710 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 711 | namelen = strlen(vol_args->name); |
f46b5a66 | 712 | |
7d9eb12c | 713 | mutex_lock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
714 | sizestr = vol_args->name; |
715 | devstr = strchr(sizestr, ':'); | |
716 | if (devstr) { | |
717 | char *end; | |
718 | sizestr = devstr + 1; | |
719 | *devstr = '\0'; | |
720 | devstr = vol_args->name; | |
721 | devid = simple_strtoull(devstr, &end, 10); | |
21380931 JB |
722 | printk(KERN_INFO "resizing devid %llu\n", |
723 | (unsigned long long)devid); | |
f46b5a66 | 724 | } |
2b82032c | 725 | device = btrfs_find_device(root, devid, NULL, NULL); |
f46b5a66 | 726 | if (!device) { |
21380931 JB |
727 | printk(KERN_INFO "resizer unable to find device %llu\n", |
728 | (unsigned long long)devid); | |
f46b5a66 CH |
729 | ret = -EINVAL; |
730 | goto out_unlock; | |
731 | } | |
732 | if (!strcmp(sizestr, "max")) | |
733 | new_size = device->bdev->bd_inode->i_size; | |
734 | else { | |
735 | if (sizestr[0] == '-') { | |
736 | mod = -1; | |
737 | sizestr++; | |
738 | } else if (sizestr[0] == '+') { | |
739 | mod = 1; | |
740 | sizestr++; | |
741 | } | |
742 | new_size = btrfs_parse_size(sizestr); | |
743 | if (new_size == 0) { | |
744 | ret = -EINVAL; | |
745 | goto out_unlock; | |
746 | } | |
747 | } | |
748 | ||
749 | old_size = device->total_bytes; | |
750 | ||
751 | if (mod < 0) { | |
752 | if (new_size > old_size) { | |
753 | ret = -EINVAL; | |
754 | goto out_unlock; | |
755 | } | |
756 | new_size = old_size - new_size; | |
757 | } else if (mod > 0) { | |
758 | new_size = old_size + new_size; | |
759 | } | |
760 | ||
761 | if (new_size < 256 * 1024 * 1024) { | |
762 | ret = -EINVAL; | |
763 | goto out_unlock; | |
764 | } | |
765 | if (new_size > device->bdev->bd_inode->i_size) { | |
766 | ret = -EFBIG; | |
767 | goto out_unlock; | |
768 | } | |
769 | ||
770 | do_div(new_size, root->sectorsize); | |
771 | new_size *= root->sectorsize; | |
772 | ||
773 | printk(KERN_INFO "new size for %s is %llu\n", | |
774 | device->name, (unsigned long long)new_size); | |
775 | ||
776 | if (new_size > old_size) { | |
777 | trans = btrfs_start_transaction(root, 1); | |
778 | ret = btrfs_grow_device(trans, device, new_size); | |
779 | btrfs_commit_transaction(trans, root); | |
780 | } else { | |
781 | ret = btrfs_shrink_device(device, new_size); | |
782 | } | |
783 | ||
784 | out_unlock: | |
7d9eb12c | 785 | mutex_unlock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
786 | kfree(vol_args); |
787 | return ret; | |
788 | } | |
789 | ||
cb8e7090 | 790 | static noinline int btrfs_ioctl_snap_create(struct file *file, |
3de4586c | 791 | void __user *arg, int subvol) |
f46b5a66 | 792 | { |
cb8e7090 | 793 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
f46b5a66 | 794 | struct btrfs_ioctl_vol_args *vol_args; |
3de4586c | 795 | struct file *src_file; |
f46b5a66 | 796 | int namelen; |
3de4586c | 797 | int ret = 0; |
f46b5a66 | 798 | |
c146afad YZ |
799 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
800 | return -EROFS; | |
801 | ||
dae7b665 LZ |
802 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
803 | if (IS_ERR(vol_args)) | |
804 | return PTR_ERR(vol_args); | |
f46b5a66 | 805 | |
5516e595 | 806 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 | 807 | namelen = strlen(vol_args->name); |
f46b5a66 CH |
808 | if (strchr(vol_args->name, '/')) { |
809 | ret = -EINVAL; | |
810 | goto out; | |
811 | } | |
812 | ||
3de4586c | 813 | if (subvol) { |
76dda93c YZ |
814 | ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, |
815 | NULL); | |
cb8e7090 | 816 | } else { |
3de4586c CM |
817 | struct inode *src_inode; |
818 | src_file = fget(vol_args->fd); | |
819 | if (!src_file) { | |
820 | ret = -EINVAL; | |
821 | goto out; | |
822 | } | |
823 | ||
824 | src_inode = src_file->f_path.dentry->d_inode; | |
825 | if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { | |
d397712b CM |
826 | printk(KERN_INFO "btrfs: Snapshot src from " |
827 | "another FS\n"); | |
3de4586c CM |
828 | ret = -EINVAL; |
829 | fput(src_file); | |
830 | goto out; | |
831 | } | |
76dda93c YZ |
832 | ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, |
833 | BTRFS_I(src_inode)->root); | |
3de4586c | 834 | fput(src_file); |
cb8e7090 | 835 | } |
f46b5a66 CH |
836 | out: |
837 | kfree(vol_args); | |
838 | return ret; | |
839 | } | |
840 | ||
76dda93c YZ |
841 | /* |
842 | * helper to check if the subvolume references other subvolumes | |
843 | */ | |
844 | static noinline int may_destroy_subvol(struct btrfs_root *root) | |
845 | { | |
846 | struct btrfs_path *path; | |
847 | struct btrfs_key key; | |
848 | int ret; | |
849 | ||
850 | path = btrfs_alloc_path(); | |
851 | if (!path) | |
852 | return -ENOMEM; | |
853 | ||
854 | key.objectid = root->root_key.objectid; | |
855 | key.type = BTRFS_ROOT_REF_KEY; | |
856 | key.offset = (u64)-1; | |
857 | ||
858 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, | |
859 | &key, path, 0, 0); | |
860 | if (ret < 0) | |
861 | goto out; | |
862 | BUG_ON(ret == 0); | |
863 | ||
864 | ret = 0; | |
865 | if (path->slots[0] > 0) { | |
866 | path->slots[0]--; | |
867 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
868 | if (key.objectid == root->root_key.objectid && | |
869 | key.type == BTRFS_ROOT_REF_KEY) | |
870 | ret = -ENOTEMPTY; | |
871 | } | |
872 | out: | |
873 | btrfs_free_path(path); | |
874 | return ret; | |
875 | } | |
876 | ||
ac8e9819 CM |
877 | static noinline int key_in_sk(struct btrfs_key *key, |
878 | struct btrfs_ioctl_search_key *sk) | |
879 | { | |
880 | if (key->objectid < sk->min_objectid) | |
881 | return 0; | |
882 | if (key->offset < sk->min_offset) | |
883 | return 0; | |
884 | if (key->type < sk->min_type) | |
885 | return 0; | |
886 | if (key->objectid > sk->max_objectid) | |
887 | return 0; | |
888 | if (key->type > sk->max_type) | |
889 | return 0; | |
890 | if (key->offset > sk->max_offset) | |
891 | return 0; | |
892 | return 1; | |
893 | } | |
894 | ||
895 | static noinline int copy_to_sk(struct btrfs_root *root, | |
896 | struct btrfs_path *path, | |
897 | struct btrfs_key *key, | |
898 | struct btrfs_ioctl_search_key *sk, | |
899 | char *buf, | |
900 | unsigned long *sk_offset, | |
901 | int *num_found) | |
902 | { | |
903 | u64 found_transid; | |
904 | struct extent_buffer *leaf; | |
905 | struct btrfs_ioctl_search_header sh; | |
906 | unsigned long item_off; | |
907 | unsigned long item_len; | |
908 | int nritems; | |
909 | int i; | |
910 | int slot; | |
911 | int found = 0; | |
912 | int ret = 0; | |
913 | ||
914 | leaf = path->nodes[0]; | |
915 | slot = path->slots[0]; | |
916 | nritems = btrfs_header_nritems(leaf); | |
917 | ||
918 | if (btrfs_header_generation(leaf) > sk->max_transid) { | |
919 | i = nritems; | |
920 | goto advance_key; | |
921 | } | |
922 | found_transid = btrfs_header_generation(leaf); | |
923 | ||
924 | for (i = slot; i < nritems; i++) { | |
925 | item_off = btrfs_item_ptr_offset(leaf, i); | |
926 | item_len = btrfs_item_size_nr(leaf, i); | |
927 | ||
928 | if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) | |
929 | item_len = 0; | |
930 | ||
931 | if (sizeof(sh) + item_len + *sk_offset > | |
932 | BTRFS_SEARCH_ARGS_BUFSIZE) { | |
933 | ret = 1; | |
934 | goto overflow; | |
935 | } | |
936 | ||
937 | btrfs_item_key_to_cpu(leaf, key, i); | |
938 | if (!key_in_sk(key, sk)) | |
939 | continue; | |
940 | ||
941 | sh.objectid = key->objectid; | |
942 | sh.offset = key->offset; | |
943 | sh.type = key->type; | |
944 | sh.len = item_len; | |
945 | sh.transid = found_transid; | |
946 | ||
947 | /* copy search result header */ | |
948 | memcpy(buf + *sk_offset, &sh, sizeof(sh)); | |
949 | *sk_offset += sizeof(sh); | |
950 | ||
951 | if (item_len) { | |
952 | char *p = buf + *sk_offset; | |
953 | /* copy the item */ | |
954 | read_extent_buffer(leaf, p, | |
955 | item_off, item_len); | |
956 | *sk_offset += item_len; | |
957 | found++; | |
958 | } | |
959 | ||
960 | if (*num_found >= sk->nr_items) | |
961 | break; | |
962 | } | |
963 | advance_key: | |
964 | if (key->offset < (u64)-1) | |
965 | key->offset++; | |
966 | else if (key->type < (u64)-1) | |
967 | key->type++; | |
968 | else if (key->objectid < (u64)-1) | |
969 | key->objectid++; | |
970 | ret = 0; | |
971 | overflow: | |
972 | *num_found += found; | |
973 | return ret; | |
974 | } | |
975 | ||
976 | static noinline int search_ioctl(struct inode *inode, | |
977 | struct btrfs_ioctl_search_args *args) | |
978 | { | |
979 | struct btrfs_root *root; | |
980 | struct btrfs_key key; | |
981 | struct btrfs_key max_key; | |
982 | struct btrfs_path *path; | |
983 | struct btrfs_ioctl_search_key *sk = &args->key; | |
984 | struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; | |
985 | int ret; | |
986 | int num_found = 0; | |
987 | unsigned long sk_offset = 0; | |
988 | ||
989 | path = btrfs_alloc_path(); | |
990 | if (!path) | |
991 | return -ENOMEM; | |
992 | ||
993 | if (sk->tree_id == 0) { | |
994 | /* search the root of the inode that was passed */ | |
995 | root = BTRFS_I(inode)->root; | |
996 | } else { | |
997 | key.objectid = sk->tree_id; | |
998 | key.type = BTRFS_ROOT_ITEM_KEY; | |
999 | key.offset = (u64)-1; | |
1000 | root = btrfs_read_fs_root_no_name(info, &key); | |
1001 | if (IS_ERR(root)) { | |
1002 | printk(KERN_ERR "could not find root %llu\n", | |
1003 | sk->tree_id); | |
1004 | btrfs_free_path(path); | |
1005 | return -ENOENT; | |
1006 | } | |
1007 | } | |
1008 | ||
1009 | key.objectid = sk->min_objectid; | |
1010 | key.type = sk->min_type; | |
1011 | key.offset = sk->min_offset; | |
1012 | ||
1013 | max_key.objectid = sk->max_objectid; | |
1014 | max_key.type = sk->max_type; | |
1015 | max_key.offset = sk->max_offset; | |
1016 | ||
1017 | path->keep_locks = 1; | |
1018 | ||
1019 | while(1) { | |
1020 | ret = btrfs_search_forward(root, &key, &max_key, path, 0, | |
1021 | sk->min_transid); | |
1022 | if (ret != 0) { | |
1023 | if (ret > 0) | |
1024 | ret = 0; | |
1025 | goto err; | |
1026 | } | |
1027 | ret = copy_to_sk(root, path, &key, sk, args->buf, | |
1028 | &sk_offset, &num_found); | |
1029 | btrfs_release_path(root, path); | |
1030 | if (ret || num_found >= sk->nr_items) | |
1031 | break; | |
1032 | ||
1033 | } | |
1034 | ret = 0; | |
1035 | err: | |
1036 | sk->nr_items = num_found; | |
1037 | btrfs_free_path(path); | |
1038 | return ret; | |
1039 | } | |
1040 | ||
1041 | static noinline int btrfs_ioctl_tree_search(struct file *file, | |
1042 | void __user *argp) | |
1043 | { | |
1044 | struct btrfs_ioctl_search_args *args; | |
1045 | struct inode *inode; | |
1046 | int ret; | |
1047 | ||
1048 | if (!capable(CAP_SYS_ADMIN)) | |
1049 | return -EPERM; | |
1050 | ||
1051 | args = kmalloc(sizeof(*args), GFP_KERNEL); | |
1052 | if (!args) | |
1053 | return -ENOMEM; | |
1054 | ||
1055 | if (copy_from_user(args, argp, sizeof(*args))) { | |
1056 | kfree(args); | |
1057 | return -EFAULT; | |
1058 | } | |
1059 | inode = fdentry(file)->d_inode; | |
1060 | ret = search_ioctl(inode, args); | |
1061 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
1062 | ret = -EFAULT; | |
1063 | kfree(args); | |
1064 | return ret; | |
1065 | } | |
1066 | ||
98d377a0 | 1067 | /* |
ac8e9819 CM |
1068 | * Search INODE_REFs to identify path name of 'dirid' directory |
1069 | * in a 'tree_id' tree. and sets path name to 'name'. | |
1070 | */ | |
98d377a0 TH |
1071 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
1072 | u64 tree_id, u64 dirid, char *name) | |
1073 | { | |
1074 | struct btrfs_root *root; | |
1075 | struct btrfs_key key; | |
ac8e9819 | 1076 | char *ptr; |
98d377a0 TH |
1077 | int ret = -1; |
1078 | int slot; | |
1079 | int len; | |
1080 | int total_len = 0; | |
1081 | struct btrfs_inode_ref *iref; | |
1082 | struct extent_buffer *l; | |
1083 | struct btrfs_path *path; | |
1084 | ||
1085 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { | |
1086 | name[0]='\0'; | |
1087 | return 0; | |
1088 | } | |
1089 | ||
1090 | path = btrfs_alloc_path(); | |
1091 | if (!path) | |
1092 | return -ENOMEM; | |
1093 | ||
ac8e9819 | 1094 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; |
98d377a0 TH |
1095 | |
1096 | key.objectid = tree_id; | |
1097 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1098 | key.offset = (u64)-1; | |
1099 | root = btrfs_read_fs_root_no_name(info, &key); | |
1100 | if (IS_ERR(root)) { | |
1101 | printk(KERN_ERR "could not find root %llu\n", tree_id); | |
1102 | return -ENOENT; | |
1103 | } | |
1104 | ||
1105 | key.objectid = dirid; | |
1106 | key.type = BTRFS_INODE_REF_KEY; | |
1107 | key.offset = 0; | |
1108 | ||
1109 | while(1) { | |
1110 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1111 | if (ret < 0) | |
1112 | goto out; | |
1113 | ||
1114 | l = path->nodes[0]; | |
1115 | slot = path->slots[0]; | |
1116 | btrfs_item_key_to_cpu(l, &key, slot); | |
1117 | ||
1118 | if (ret > 0 && (key.objectid != dirid || | |
ac8e9819 CM |
1119 | key.type != BTRFS_INODE_REF_KEY)) { |
1120 | ret = -ENOENT; | |
98d377a0 | 1121 | goto out; |
ac8e9819 | 1122 | } |
98d377a0 TH |
1123 | |
1124 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); | |
1125 | len = btrfs_inode_ref_name_len(l, iref); | |
1126 | ptr -= len + 1; | |
1127 | total_len += len + 1; | |
ac8e9819 | 1128 | if (ptr < name) |
98d377a0 TH |
1129 | goto out; |
1130 | ||
1131 | *(ptr + len) = '/'; | |
1132 | read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); | |
1133 | ||
1134 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) | |
1135 | break; | |
1136 | ||
1137 | btrfs_release_path(root, path); | |
1138 | key.objectid = key.offset; | |
1139 | key.offset = 0; | |
1140 | dirid = key.objectid; | |
1141 | ||
1142 | } | |
ac8e9819 | 1143 | if (ptr < name) |
98d377a0 | 1144 | goto out; |
ac8e9819 | 1145 | memcpy(name, ptr, total_len); |
98d377a0 TH |
1146 | name[total_len]='\0'; |
1147 | ret = 0; | |
1148 | out: | |
1149 | btrfs_free_path(path); | |
ac8e9819 CM |
1150 | return ret; |
1151 | } | |
1152 | ||
1153 | static noinline int btrfs_ioctl_ino_lookup(struct file *file, | |
1154 | void __user *argp) | |
1155 | { | |
1156 | struct btrfs_ioctl_ino_lookup_args *args; | |
1157 | struct inode *inode; | |
1158 | int ret; | |
1159 | ||
1160 | if (!capable(CAP_SYS_ADMIN)) | |
1161 | return -EPERM; | |
1162 | ||
1163 | args = kmalloc(sizeof(*args), GFP_KERNEL); | |
1164 | if (copy_from_user(args, argp, sizeof(*args))) { | |
1165 | kfree(args); | |
1166 | return -EFAULT; | |
1167 | } | |
1168 | inode = fdentry(file)->d_inode; | |
1169 | ||
1170 | ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, | |
1171 | args->treeid, args->objectid, | |
1172 | args->name); | |
1173 | ||
1174 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
1175 | ret = -EFAULT; | |
1176 | ||
1177 | kfree(args); | |
98d377a0 TH |
1178 | return ret; |
1179 | } | |
1180 | ||
76dda93c YZ |
1181 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
1182 | void __user *arg) | |
1183 | { | |
1184 | struct dentry *parent = fdentry(file); | |
1185 | struct dentry *dentry; | |
1186 | struct inode *dir = parent->d_inode; | |
1187 | struct inode *inode; | |
1188 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1189 | struct btrfs_root *dest = NULL; | |
1190 | struct btrfs_ioctl_vol_args *vol_args; | |
1191 | struct btrfs_trans_handle *trans; | |
1192 | int namelen; | |
1193 | int ret; | |
1194 | int err = 0; | |
1195 | ||
1196 | if (!capable(CAP_SYS_ADMIN)) | |
1197 | return -EPERM; | |
1198 | ||
1199 | vol_args = memdup_user(arg, sizeof(*vol_args)); | |
1200 | if (IS_ERR(vol_args)) | |
1201 | return PTR_ERR(vol_args); | |
1202 | ||
1203 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
1204 | namelen = strlen(vol_args->name); | |
1205 | if (strchr(vol_args->name, '/') || | |
1206 | strncmp(vol_args->name, "..", namelen) == 0) { | |
1207 | err = -EINVAL; | |
1208 | goto out; | |
1209 | } | |
1210 | ||
1211 | err = mnt_want_write(file->f_path.mnt); | |
1212 | if (err) | |
1213 | goto out; | |
1214 | ||
1215 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
1216 | dentry = lookup_one_len(vol_args->name, parent, namelen); | |
1217 | if (IS_ERR(dentry)) { | |
1218 | err = PTR_ERR(dentry); | |
1219 | goto out_unlock_dir; | |
1220 | } | |
1221 | ||
1222 | if (!dentry->d_inode) { | |
1223 | err = -ENOENT; | |
1224 | goto out_dput; | |
1225 | } | |
1226 | ||
1227 | inode = dentry->d_inode; | |
1228 | if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { | |
1229 | err = -EINVAL; | |
1230 | goto out_dput; | |
1231 | } | |
1232 | ||
1233 | dest = BTRFS_I(inode)->root; | |
1234 | ||
1235 | mutex_lock(&inode->i_mutex); | |
1236 | err = d_invalidate(dentry); | |
1237 | if (err) | |
1238 | goto out_unlock; | |
1239 | ||
1240 | down_write(&root->fs_info->subvol_sem); | |
1241 | ||
1242 | err = may_destroy_subvol(dest); | |
1243 | if (err) | |
1244 | goto out_up_write; | |
1245 | ||
1246 | trans = btrfs_start_transaction(root, 1); | |
1247 | ret = btrfs_unlink_subvol(trans, root, dir, | |
1248 | dest->root_key.objectid, | |
1249 | dentry->d_name.name, | |
1250 | dentry->d_name.len); | |
1251 | BUG_ON(ret); | |
1252 | ||
1253 | btrfs_record_root_in_trans(trans, dest); | |
1254 | ||
1255 | memset(&dest->root_item.drop_progress, 0, | |
1256 | sizeof(dest->root_item.drop_progress)); | |
1257 | dest->root_item.drop_level = 0; | |
1258 | btrfs_set_root_refs(&dest->root_item, 0); | |
1259 | ||
1260 | ret = btrfs_insert_orphan_item(trans, | |
1261 | root->fs_info->tree_root, | |
1262 | dest->root_key.objectid); | |
1263 | BUG_ON(ret); | |
1264 | ||
1265 | ret = btrfs_commit_transaction(trans, root); | |
1266 | BUG_ON(ret); | |
1267 | inode->i_flags |= S_DEAD; | |
1268 | out_up_write: | |
1269 | up_write(&root->fs_info->subvol_sem); | |
1270 | out_unlock: | |
1271 | mutex_unlock(&inode->i_mutex); | |
1272 | if (!err) { | |
efefb143 | 1273 | shrink_dcache_sb(root->fs_info->sb); |
76dda93c YZ |
1274 | btrfs_invalidate_inodes(dest); |
1275 | d_delete(dentry); | |
1276 | } | |
1277 | out_dput: | |
1278 | dput(dentry); | |
1279 | out_unlock_dir: | |
1280 | mutex_unlock(&dir->i_mutex); | |
1281 | mnt_drop_write(file->f_path.mnt); | |
1282 | out: | |
1283 | kfree(vol_args); | |
1284 | return err; | |
1285 | } | |
1286 | ||
f46b5a66 CH |
1287 | static int btrfs_ioctl_defrag(struct file *file) |
1288 | { | |
1289 | struct inode *inode = fdentry(file)->d_inode; | |
1290 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
c146afad YZ |
1291 | int ret; |
1292 | ||
1293 | ret = mnt_want_write(file->f_path.mnt); | |
1294 | if (ret) | |
1295 | return ret; | |
f46b5a66 CH |
1296 | |
1297 | switch (inode->i_mode & S_IFMT) { | |
1298 | case S_IFDIR: | |
e441d54d CM |
1299 | if (!capable(CAP_SYS_ADMIN)) { |
1300 | ret = -EPERM; | |
1301 | goto out; | |
1302 | } | |
f46b5a66 CH |
1303 | btrfs_defrag_root(root, 0); |
1304 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
f46b5a66 CH |
1305 | break; |
1306 | case S_IFREG: | |
e441d54d CM |
1307 | if (!(file->f_mode & FMODE_WRITE)) { |
1308 | ret = -EINVAL; | |
1309 | goto out; | |
1310 | } | |
f46b5a66 CH |
1311 | btrfs_defrag_file(file); |
1312 | break; | |
1313 | } | |
e441d54d | 1314 | out: |
ab67b7c1 | 1315 | mnt_drop_write(file->f_path.mnt); |
e441d54d | 1316 | return ret; |
f46b5a66 CH |
1317 | } |
1318 | ||
b2950863 | 1319 | static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
1320 | { |
1321 | struct btrfs_ioctl_vol_args *vol_args; | |
1322 | int ret; | |
1323 | ||
e441d54d CM |
1324 | if (!capable(CAP_SYS_ADMIN)) |
1325 | return -EPERM; | |
1326 | ||
dae7b665 LZ |
1327 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1328 | if (IS_ERR(vol_args)) | |
1329 | return PTR_ERR(vol_args); | |
f46b5a66 | 1330 | |
5516e595 | 1331 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
1332 | ret = btrfs_init_new_device(root, vol_args->name); |
1333 | ||
f46b5a66 CH |
1334 | kfree(vol_args); |
1335 | return ret; | |
1336 | } | |
1337 | ||
b2950863 | 1338 | static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
1339 | { |
1340 | struct btrfs_ioctl_vol_args *vol_args; | |
1341 | int ret; | |
1342 | ||
e441d54d CM |
1343 | if (!capable(CAP_SYS_ADMIN)) |
1344 | return -EPERM; | |
1345 | ||
c146afad YZ |
1346 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
1347 | return -EROFS; | |
1348 | ||
dae7b665 LZ |
1349 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1350 | if (IS_ERR(vol_args)) | |
1351 | return PTR_ERR(vol_args); | |
f46b5a66 | 1352 | |
5516e595 | 1353 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
1354 | ret = btrfs_rm_device(root, vol_args->name); |
1355 | ||
f46b5a66 CH |
1356 | kfree(vol_args); |
1357 | return ret; | |
1358 | } | |
1359 | ||
76dda93c YZ |
1360 | static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, |
1361 | u64 off, u64 olen, u64 destoff) | |
f46b5a66 CH |
1362 | { |
1363 | struct inode *inode = fdentry(file)->d_inode; | |
1364 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1365 | struct file *src_file; | |
1366 | struct inode *src; | |
1367 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 1368 | struct btrfs_path *path; |
f46b5a66 | 1369 | struct extent_buffer *leaf; |
ae01a0ab YZ |
1370 | char *buf; |
1371 | struct btrfs_key key; | |
f46b5a66 CH |
1372 | u32 nritems; |
1373 | int slot; | |
ae01a0ab | 1374 | int ret; |
c5c9cd4d SW |
1375 | u64 len = olen; |
1376 | u64 bs = root->fs_info->sb->s_blocksize; | |
1377 | u64 hint_byte; | |
d20f7043 | 1378 | |
c5c9cd4d SW |
1379 | /* |
1380 | * TODO: | |
1381 | * - split compressed inline extents. annoying: we need to | |
1382 | * decompress into destination's address_space (the file offset | |
1383 | * may change, so source mapping won't do), then recompress (or | |
1384 | * otherwise reinsert) a subrange. | |
1385 | * - allow ranges within the same file to be cloned (provided | |
1386 | * they don't overlap)? | |
1387 | */ | |
1388 | ||
e441d54d CM |
1389 | /* the destination must be opened for writing */ |
1390 | if (!(file->f_mode & FMODE_WRITE)) | |
1391 | return -EINVAL; | |
1392 | ||
c146afad YZ |
1393 | ret = mnt_want_write(file->f_path.mnt); |
1394 | if (ret) | |
1395 | return ret; | |
1396 | ||
c5c9cd4d | 1397 | src_file = fget(srcfd); |
ab67b7c1 YZ |
1398 | if (!src_file) { |
1399 | ret = -EBADF; | |
1400 | goto out_drop_write; | |
1401 | } | |
f46b5a66 CH |
1402 | src = src_file->f_dentry->d_inode; |
1403 | ||
c5c9cd4d SW |
1404 | ret = -EINVAL; |
1405 | if (src == inode) | |
1406 | goto out_fput; | |
1407 | ||
ae01a0ab YZ |
1408 | ret = -EISDIR; |
1409 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) | |
1410 | goto out_fput; | |
1411 | ||
f46b5a66 | 1412 | ret = -EXDEV; |
ae01a0ab YZ |
1413 | if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) |
1414 | goto out_fput; | |
1415 | ||
1416 | ret = -ENOMEM; | |
1417 | buf = vmalloc(btrfs_level_size(root, 0)); | |
1418 | if (!buf) | |
1419 | goto out_fput; | |
1420 | ||
1421 | path = btrfs_alloc_path(); | |
1422 | if (!path) { | |
1423 | vfree(buf); | |
f46b5a66 | 1424 | goto out_fput; |
ae01a0ab YZ |
1425 | } |
1426 | path->reada = 2; | |
f46b5a66 CH |
1427 | |
1428 | if (inode < src) { | |
1429 | mutex_lock(&inode->i_mutex); | |
1430 | mutex_lock(&src->i_mutex); | |
1431 | } else { | |
1432 | mutex_lock(&src->i_mutex); | |
1433 | mutex_lock(&inode->i_mutex); | |
1434 | } | |
1435 | ||
c5c9cd4d SW |
1436 | /* determine range to clone */ |
1437 | ret = -EINVAL; | |
1438 | if (off >= src->i_size || off + len > src->i_size) | |
f46b5a66 | 1439 | goto out_unlock; |
c5c9cd4d SW |
1440 | if (len == 0) |
1441 | olen = len = src->i_size - off; | |
1442 | /* if we extend to eof, continue to block boundary */ | |
1443 | if (off + len == src->i_size) | |
1444 | len = ((src->i_size + bs-1) & ~(bs-1)) | |
1445 | - off; | |
1446 | ||
1447 | /* verify the end result is block aligned */ | |
1448 | if ((off & (bs-1)) || | |
1449 | ((off + len) & (bs-1))) | |
1450 | goto out_unlock; | |
1451 | ||
f46b5a66 CH |
1452 | /* do any pending delalloc/csum calc on src, one way or |
1453 | another, and lock file content */ | |
1454 | while (1) { | |
31840ae1 | 1455 | struct btrfs_ordered_extent *ordered; |
c5c9cd4d SW |
1456 | lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
1457 | ordered = btrfs_lookup_first_ordered_extent(inode, off+len); | |
ae01a0ab | 1458 | if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) |
f46b5a66 | 1459 | break; |
c5c9cd4d | 1460 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
ae01a0ab YZ |
1461 | if (ordered) |
1462 | btrfs_put_ordered_extent(ordered); | |
c5c9cd4d | 1463 | btrfs_wait_ordered_range(src, off, off+len); |
f46b5a66 CH |
1464 | } |
1465 | ||
ae01a0ab YZ |
1466 | trans = btrfs_start_transaction(root, 1); |
1467 | BUG_ON(!trans); | |
1468 | ||
c5c9cd4d | 1469 | /* punch hole in destination first */ |
920bbbfb | 1470 | btrfs_drop_extents(trans, inode, off, off + len, &hint_byte, 1); |
c5c9cd4d SW |
1471 | |
1472 | /* clone data */ | |
f46b5a66 | 1473 | key.objectid = src->i_ino; |
ae01a0ab YZ |
1474 | key.type = BTRFS_EXTENT_DATA_KEY; |
1475 | key.offset = 0; | |
f46b5a66 CH |
1476 | |
1477 | while (1) { | |
1478 | /* | |
1479 | * note the key will change type as we walk through the | |
1480 | * tree. | |
1481 | */ | |
1482 | ret = btrfs_search_slot(trans, root, &key, path, 0, 0); | |
1483 | if (ret < 0) | |
1484 | goto out; | |
1485 | ||
ae01a0ab YZ |
1486 | nritems = btrfs_header_nritems(path->nodes[0]); |
1487 | if (path->slots[0] >= nritems) { | |
f46b5a66 CH |
1488 | ret = btrfs_next_leaf(root, path); |
1489 | if (ret < 0) | |
1490 | goto out; | |
1491 | if (ret > 0) | |
1492 | break; | |
ae01a0ab | 1493 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
1494 | } |
1495 | leaf = path->nodes[0]; | |
1496 | slot = path->slots[0]; | |
f46b5a66 | 1497 | |
ae01a0ab | 1498 | btrfs_item_key_to_cpu(leaf, &key, slot); |
d20f7043 | 1499 | if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || |
f46b5a66 CH |
1500 | key.objectid != src->i_ino) |
1501 | break; | |
1502 | ||
c5c9cd4d SW |
1503 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
1504 | struct btrfs_file_extent_item *extent; | |
1505 | int type; | |
31840ae1 ZY |
1506 | u32 size; |
1507 | struct btrfs_key new_key; | |
c5c9cd4d SW |
1508 | u64 disko = 0, diskl = 0; |
1509 | u64 datao = 0, datal = 0; | |
1510 | u8 comp; | |
31840ae1 ZY |
1511 | |
1512 | size = btrfs_item_size_nr(leaf, slot); | |
1513 | read_extent_buffer(leaf, buf, | |
1514 | btrfs_item_ptr_offset(leaf, slot), | |
1515 | size); | |
c5c9cd4d SW |
1516 | |
1517 | extent = btrfs_item_ptr(leaf, slot, | |
1518 | struct btrfs_file_extent_item); | |
1519 | comp = btrfs_file_extent_compression(leaf, extent); | |
1520 | type = btrfs_file_extent_type(leaf, extent); | |
c8a894d7 CM |
1521 | if (type == BTRFS_FILE_EXTENT_REG || |
1522 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d397712b CM |
1523 | disko = btrfs_file_extent_disk_bytenr(leaf, |
1524 | extent); | |
1525 | diskl = btrfs_file_extent_disk_num_bytes(leaf, | |
1526 | extent); | |
c5c9cd4d | 1527 | datao = btrfs_file_extent_offset(leaf, extent); |
d397712b CM |
1528 | datal = btrfs_file_extent_num_bytes(leaf, |
1529 | extent); | |
c5c9cd4d SW |
1530 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
1531 | /* take upper bound, may be compressed */ | |
1532 | datal = btrfs_file_extent_ram_bytes(leaf, | |
1533 | extent); | |
1534 | } | |
31840ae1 ZY |
1535 | btrfs_release_path(root, path); |
1536 | ||
c5c9cd4d SW |
1537 | if (key.offset + datal < off || |
1538 | key.offset >= off+len) | |
1539 | goto next; | |
1540 | ||
31840ae1 ZY |
1541 | memcpy(&new_key, &key, sizeof(new_key)); |
1542 | new_key.objectid = inode->i_ino; | |
c5c9cd4d | 1543 | new_key.offset = key.offset + destoff - off; |
31840ae1 | 1544 | |
c8a894d7 CM |
1545 | if (type == BTRFS_FILE_EXTENT_REG || |
1546 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
c5c9cd4d SW |
1547 | ret = btrfs_insert_empty_item(trans, root, path, |
1548 | &new_key, size); | |
1549 | if (ret) | |
1550 | goto out; | |
1551 | ||
1552 | leaf = path->nodes[0]; | |
1553 | slot = path->slots[0]; | |
1554 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
1555 | btrfs_item_ptr_offset(leaf, slot), |
1556 | size); | |
ae01a0ab | 1557 | |
c5c9cd4d | 1558 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 1559 | struct btrfs_file_extent_item); |
c5c9cd4d SW |
1560 | |
1561 | if (off > key.offset) { | |
1562 | datao += off - key.offset; | |
1563 | datal -= off - key.offset; | |
1564 | } | |
ac6889cb CM |
1565 | |
1566 | if (key.offset + datal > off + len) | |
1567 | datal = off + len - key.offset; | |
1568 | ||
c5c9cd4d SW |
1569 | /* disko == 0 means it's a hole */ |
1570 | if (!disko) | |
1571 | datao = 0; | |
c5c9cd4d SW |
1572 | |
1573 | btrfs_set_file_extent_offset(leaf, extent, | |
1574 | datao); | |
1575 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
1576 | datal); | |
1577 | if (disko) { | |
1578 | inode_add_bytes(inode, datal); | |
ae01a0ab | 1579 | ret = btrfs_inc_extent_ref(trans, root, |
5d4f98a2 YZ |
1580 | disko, diskl, 0, |
1581 | root->root_key.objectid, | |
1582 | inode->i_ino, | |
1583 | new_key.offset - datao); | |
31840ae1 | 1584 | BUG_ON(ret); |
f46b5a66 | 1585 | } |
c5c9cd4d SW |
1586 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
1587 | u64 skip = 0; | |
1588 | u64 trim = 0; | |
1589 | if (off > key.offset) { | |
1590 | skip = off - key.offset; | |
1591 | new_key.offset += skip; | |
1592 | } | |
d397712b | 1593 | |
c5c9cd4d SW |
1594 | if (key.offset + datal > off+len) |
1595 | trim = key.offset + datal - (off+len); | |
d397712b | 1596 | |
c5c9cd4d | 1597 | if (comp && (skip || trim)) { |
c5c9cd4d SW |
1598 | ret = -EINVAL; |
1599 | goto out; | |
1600 | } | |
1601 | size -= skip + trim; | |
1602 | datal -= skip + trim; | |
1603 | ret = btrfs_insert_empty_item(trans, root, path, | |
1604 | &new_key, size); | |
1605 | if (ret) | |
1606 | goto out; | |
1607 | ||
1608 | if (skip) { | |
d397712b CM |
1609 | u32 start = |
1610 | btrfs_file_extent_calc_inline_size(0); | |
c5c9cd4d SW |
1611 | memmove(buf+start, buf+start+skip, |
1612 | datal); | |
1613 | } | |
1614 | ||
1615 | leaf = path->nodes[0]; | |
1616 | slot = path->slots[0]; | |
1617 | write_extent_buffer(leaf, buf, | |
1618 | btrfs_item_ptr_offset(leaf, slot), | |
1619 | size); | |
1620 | inode_add_bytes(inode, datal); | |
f46b5a66 | 1621 | } |
c5c9cd4d SW |
1622 | |
1623 | btrfs_mark_buffer_dirty(leaf); | |
ae01a0ab | 1624 | } |
c5c9cd4d | 1625 | |
d397712b | 1626 | next: |
31840ae1 | 1627 | btrfs_release_path(root, path); |
f46b5a66 | 1628 | key.offset++; |
f46b5a66 | 1629 | } |
f46b5a66 CH |
1630 | ret = 0; |
1631 | out: | |
ae01a0ab YZ |
1632 | btrfs_release_path(root, path); |
1633 | if (ret == 0) { | |
1634 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
c5c9cd4d SW |
1635 | if (destoff + olen > inode->i_size) |
1636 | btrfs_i_size_write(inode, destoff + olen); | |
ae01a0ab YZ |
1637 | BTRFS_I(inode)->flags = BTRFS_I(src)->flags; |
1638 | ret = btrfs_update_inode(trans, root, inode); | |
1639 | } | |
f46b5a66 | 1640 | btrfs_end_transaction(trans, root); |
c5c9cd4d | 1641 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
ae01a0ab YZ |
1642 | if (ret) |
1643 | vmtruncate(inode, 0); | |
f46b5a66 CH |
1644 | out_unlock: |
1645 | mutex_unlock(&src->i_mutex); | |
1646 | mutex_unlock(&inode->i_mutex); | |
ae01a0ab YZ |
1647 | vfree(buf); |
1648 | btrfs_free_path(path); | |
f46b5a66 CH |
1649 | out_fput: |
1650 | fput(src_file); | |
ab67b7c1 YZ |
1651 | out_drop_write: |
1652 | mnt_drop_write(file->f_path.mnt); | |
f46b5a66 CH |
1653 | return ret; |
1654 | } | |
1655 | ||
7a865e8a | 1656 | static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) |
c5c9cd4d SW |
1657 | { |
1658 | struct btrfs_ioctl_clone_range_args args; | |
1659 | ||
7a865e8a | 1660 | if (copy_from_user(&args, argp, sizeof(args))) |
c5c9cd4d SW |
1661 | return -EFAULT; |
1662 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, | |
1663 | args.src_length, args.dest_offset); | |
1664 | } | |
1665 | ||
f46b5a66 CH |
1666 | /* |
1667 | * there are many ways the trans_start and trans_end ioctls can lead | |
1668 | * to deadlocks. They should only be used by applications that | |
1669 | * basically own the machine, and have a very in depth understanding | |
1670 | * of all the possible deadlocks and enospc problems. | |
1671 | */ | |
b2950863 | 1672 | static long btrfs_ioctl_trans_start(struct file *file) |
f46b5a66 CH |
1673 | { |
1674 | struct inode *inode = fdentry(file)->d_inode; | |
1675 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1676 | struct btrfs_trans_handle *trans; | |
1ab86aed | 1677 | int ret; |
f46b5a66 | 1678 | |
1ab86aed | 1679 | ret = -EPERM; |
df5b5520 | 1680 | if (!capable(CAP_SYS_ADMIN)) |
1ab86aed | 1681 | goto out; |
df5b5520 | 1682 | |
1ab86aed SW |
1683 | ret = -EINPROGRESS; |
1684 | if (file->private_data) | |
f46b5a66 | 1685 | goto out; |
9ca9ee09 | 1686 | |
c146afad YZ |
1687 | ret = mnt_want_write(file->f_path.mnt); |
1688 | if (ret) | |
1689 | goto out; | |
1690 | ||
9ca9ee09 SW |
1691 | mutex_lock(&root->fs_info->trans_mutex); |
1692 | root->fs_info->open_ioctl_trans++; | |
1693 | mutex_unlock(&root->fs_info->trans_mutex); | |
1694 | ||
1ab86aed | 1695 | ret = -ENOMEM; |
9ca9ee09 | 1696 | trans = btrfs_start_ioctl_transaction(root, 0); |
1ab86aed SW |
1697 | if (!trans) |
1698 | goto out_drop; | |
1699 | ||
1700 | file->private_data = trans; | |
1701 | return 0; | |
1702 | ||
1703 | out_drop: | |
1704 | mutex_lock(&root->fs_info->trans_mutex); | |
1705 | root->fs_info->open_ioctl_trans--; | |
1706 | mutex_unlock(&root->fs_info->trans_mutex); | |
1707 | mnt_drop_write(file->f_path.mnt); | |
f46b5a66 | 1708 | out: |
f46b5a66 CH |
1709 | return ret; |
1710 | } | |
1711 | ||
6ef5ed0d JB |
1712 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
1713 | { | |
1714 | struct inode *inode = fdentry(file)->d_inode; | |
1715 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1716 | struct btrfs_root *new_root; | |
1717 | struct btrfs_dir_item *di; | |
1718 | struct btrfs_trans_handle *trans; | |
1719 | struct btrfs_path *path; | |
1720 | struct btrfs_key location; | |
1721 | struct btrfs_disk_key disk_key; | |
1722 | struct btrfs_super_block *disk_super; | |
1723 | u64 features; | |
1724 | u64 objectid = 0; | |
1725 | u64 dir_id; | |
1726 | ||
1727 | if (!capable(CAP_SYS_ADMIN)) | |
1728 | return -EPERM; | |
1729 | ||
1730 | if (copy_from_user(&objectid, argp, sizeof(objectid))) | |
1731 | return -EFAULT; | |
1732 | ||
1733 | if (!objectid) | |
1734 | objectid = root->root_key.objectid; | |
1735 | ||
1736 | location.objectid = objectid; | |
1737 | location.type = BTRFS_ROOT_ITEM_KEY; | |
1738 | location.offset = (u64)-1; | |
1739 | ||
1740 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
1741 | if (IS_ERR(new_root)) | |
1742 | return PTR_ERR(new_root); | |
1743 | ||
1744 | if (btrfs_root_refs(&new_root->root_item) == 0) | |
1745 | return -ENOENT; | |
1746 | ||
1747 | path = btrfs_alloc_path(); | |
1748 | if (!path) | |
1749 | return -ENOMEM; | |
1750 | path->leave_spinning = 1; | |
1751 | ||
1752 | trans = btrfs_start_transaction(root, 1); | |
1753 | if (!trans) { | |
1754 | btrfs_free_path(path); | |
1755 | return -ENOMEM; | |
1756 | } | |
1757 | ||
1758 | dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); | |
1759 | di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, | |
1760 | dir_id, "default", 7, 1); | |
1761 | if (!di) { | |
1762 | btrfs_free_path(path); | |
1763 | btrfs_end_transaction(trans, root); | |
1764 | printk(KERN_ERR "Umm, you don't have the default dir item, " | |
1765 | "this isn't going to work\n"); | |
1766 | return -ENOENT; | |
1767 | } | |
1768 | ||
1769 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); | |
1770 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); | |
1771 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
1772 | btrfs_free_path(path); | |
1773 | ||
1774 | disk_super = &root->fs_info->super_copy; | |
1775 | features = btrfs_super_incompat_flags(disk_super); | |
1776 | if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { | |
1777 | features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; | |
1778 | btrfs_set_super_incompat_flags(disk_super, features); | |
1779 | } | |
1780 | btrfs_end_transaction(trans, root); | |
1781 | ||
1782 | return 0; | |
1783 | } | |
1784 | ||
f46b5a66 CH |
1785 | /* |
1786 | * there are many ways the trans_start and trans_end ioctls can lead | |
1787 | * to deadlocks. They should only be used by applications that | |
1788 | * basically own the machine, and have a very in depth understanding | |
1789 | * of all the possible deadlocks and enospc problems. | |
1790 | */ | |
1791 | long btrfs_ioctl_trans_end(struct file *file) | |
1792 | { | |
1793 | struct inode *inode = fdentry(file)->d_inode; | |
1794 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1795 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 1796 | |
f46b5a66 | 1797 | trans = file->private_data; |
1ab86aed SW |
1798 | if (!trans) |
1799 | return -EINVAL; | |
b214107e | 1800 | file->private_data = NULL; |
9ca9ee09 | 1801 | |
1ab86aed SW |
1802 | btrfs_end_transaction(trans, root); |
1803 | ||
9ca9ee09 SW |
1804 | mutex_lock(&root->fs_info->trans_mutex); |
1805 | root->fs_info->open_ioctl_trans--; | |
1806 | mutex_unlock(&root->fs_info->trans_mutex); | |
1807 | ||
cfc8ea87 | 1808 | mnt_drop_write(file->f_path.mnt); |
1ab86aed | 1809 | return 0; |
f46b5a66 CH |
1810 | } |
1811 | ||
1812 | long btrfs_ioctl(struct file *file, unsigned int | |
1813 | cmd, unsigned long arg) | |
1814 | { | |
1815 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; | |
4bcabaa3 | 1816 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
1817 | |
1818 | switch (cmd) { | |
6cbff00f CH |
1819 | case FS_IOC_GETFLAGS: |
1820 | return btrfs_ioctl_getflags(file, argp); | |
1821 | case FS_IOC_SETFLAGS: | |
1822 | return btrfs_ioctl_setflags(file, argp); | |
1823 | case FS_IOC_GETVERSION: | |
1824 | return btrfs_ioctl_getversion(file, argp); | |
f46b5a66 | 1825 | case BTRFS_IOC_SNAP_CREATE: |
4bcabaa3 | 1826 | return btrfs_ioctl_snap_create(file, argp, 0); |
3de4586c | 1827 | case BTRFS_IOC_SUBVOL_CREATE: |
4bcabaa3 | 1828 | return btrfs_ioctl_snap_create(file, argp, 1); |
76dda93c YZ |
1829 | case BTRFS_IOC_SNAP_DESTROY: |
1830 | return btrfs_ioctl_snap_destroy(file, argp); | |
6ef5ed0d JB |
1831 | case BTRFS_IOC_DEFAULT_SUBVOL: |
1832 | return btrfs_ioctl_default_subvol(file, argp); | |
f46b5a66 CH |
1833 | case BTRFS_IOC_DEFRAG: |
1834 | return btrfs_ioctl_defrag(file); | |
1835 | case BTRFS_IOC_RESIZE: | |
4bcabaa3 | 1836 | return btrfs_ioctl_resize(root, argp); |
f46b5a66 | 1837 | case BTRFS_IOC_ADD_DEV: |
4bcabaa3 | 1838 | return btrfs_ioctl_add_dev(root, argp); |
f46b5a66 | 1839 | case BTRFS_IOC_RM_DEV: |
4bcabaa3 | 1840 | return btrfs_ioctl_rm_dev(root, argp); |
f46b5a66 CH |
1841 | case BTRFS_IOC_BALANCE: |
1842 | return btrfs_balance(root->fs_info->dev_root); | |
1843 | case BTRFS_IOC_CLONE: | |
c5c9cd4d SW |
1844 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
1845 | case BTRFS_IOC_CLONE_RANGE: | |
7a865e8a | 1846 | return btrfs_ioctl_clone_range(file, argp); |
f46b5a66 CH |
1847 | case BTRFS_IOC_TRANS_START: |
1848 | return btrfs_ioctl_trans_start(file); | |
1849 | case BTRFS_IOC_TRANS_END: | |
1850 | return btrfs_ioctl_trans_end(file); | |
ac8e9819 CM |
1851 | case BTRFS_IOC_TREE_SEARCH: |
1852 | return btrfs_ioctl_tree_search(file, argp); | |
1853 | case BTRFS_IOC_INO_LOOKUP: | |
1854 | return btrfs_ioctl_ino_lookup(file, argp); | |
f46b5a66 CH |
1855 | case BTRFS_IOC_SYNC: |
1856 | btrfs_sync_fs(file->f_dentry->d_sb, 1); | |
1857 | return 0; | |
1858 | } | |
1859 | ||
1860 | return -ENOTTY; | |
1861 | } |