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Commit | Line | Data |
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f46b5a66 CH |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/bio.h> | |
21 | #include <linux/buffer_head.h> | |
22 | #include <linux/file.h> | |
23 | #include <linux/fs.h> | |
cb8e7090 | 24 | #include <linux/fsnotify.h> |
f46b5a66 CH |
25 | #include <linux/pagemap.h> |
26 | #include <linux/highmem.h> | |
27 | #include <linux/time.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/string.h> | |
f46b5a66 | 30 | #include <linux/backing-dev.h> |
cb8e7090 | 31 | #include <linux/mount.h> |
f46b5a66 | 32 | #include <linux/mpage.h> |
cb8e7090 | 33 | #include <linux/namei.h> |
f46b5a66 CH |
34 | #include <linux/swap.h> |
35 | #include <linux/writeback.h> | |
36 | #include <linux/statfs.h> | |
37 | #include <linux/compat.h> | |
38 | #include <linux/bit_spinlock.h> | |
cb8e7090 | 39 | #include <linux/security.h> |
f46b5a66 | 40 | #include <linux/xattr.h> |
7ea394f1 | 41 | #include <linux/vmalloc.h> |
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 | ||
b2950863 | 478 | static int btrfs_defrag_file(struct file *file) |
f46b5a66 CH |
479 | { |
480 | struct inode *inode = fdentry(file)->d_inode; | |
481 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
482 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
3eaa2885 | 483 | struct btrfs_ordered_extent *ordered; |
f46b5a66 CH |
484 | struct page *page; |
485 | unsigned long last_index; | |
486 | unsigned long ra_pages = root->fs_info->bdi.ra_pages; | |
487 | unsigned long total_read = 0; | |
488 | u64 page_start; | |
489 | u64 page_end; | |
490 | unsigned long i; | |
491 | int ret; | |
492 | ||
6a63209f | 493 | ret = btrfs_check_data_free_space(root, inode, inode->i_size); |
f46b5a66 CH |
494 | if (ret) |
495 | return -ENOSPC; | |
496 | ||
497 | mutex_lock(&inode->i_mutex); | |
498 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
499 | for (i = 0; i <= last_index; i++) { | |
500 | if (total_read % ra_pages == 0) { | |
501 | btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, | |
502 | min(last_index, i + ra_pages - 1)); | |
503 | } | |
504 | total_read++; | |
3eaa2885 | 505 | again: |
f46b5a66 CH |
506 | page = grab_cache_page(inode->i_mapping, i); |
507 | if (!page) | |
508 | goto out_unlock; | |
509 | if (!PageUptodate(page)) { | |
510 | btrfs_readpage(NULL, page); | |
511 | lock_page(page); | |
512 | if (!PageUptodate(page)) { | |
513 | unlock_page(page); | |
514 | page_cache_release(page); | |
515 | goto out_unlock; | |
516 | } | |
517 | } | |
518 | ||
f46b5a66 | 519 | wait_on_page_writeback(page); |
f46b5a66 CH |
520 | |
521 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; | |
522 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
f46b5a66 | 523 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
3eaa2885 CM |
524 | |
525 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
526 | if (ordered) { | |
527 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
528 | unlock_page(page); | |
529 | page_cache_release(page); | |
530 | btrfs_start_ordered_extent(inode, ordered, 1); | |
531 | btrfs_put_ordered_extent(ordered); | |
532 | goto again; | |
533 | } | |
534 | set_page_extent_mapped(page); | |
535 | ||
f87f057b CM |
536 | /* |
537 | * this makes sure page_mkwrite is called on the | |
538 | * page if it is dirtied again later | |
539 | */ | |
540 | clear_page_dirty_for_io(page); | |
541 | ||
ea8c2819 | 542 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
f46b5a66 | 543 | set_page_dirty(page); |
a1ed835e | 544 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
f46b5a66 CH |
545 | unlock_page(page); |
546 | page_cache_release(page); | |
547 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
548 | } | |
549 | ||
550 | out_unlock: | |
551 | mutex_unlock(&inode->i_mutex); | |
552 | return 0; | |
553 | } | |
554 | ||
76dda93c YZ |
555 | static noinline int btrfs_ioctl_resize(struct btrfs_root *root, |
556 | void __user *arg) | |
f46b5a66 CH |
557 | { |
558 | u64 new_size; | |
559 | u64 old_size; | |
560 | u64 devid = 1; | |
561 | struct btrfs_ioctl_vol_args *vol_args; | |
562 | struct btrfs_trans_handle *trans; | |
563 | struct btrfs_device *device = NULL; | |
564 | char *sizestr; | |
565 | char *devstr = NULL; | |
566 | int ret = 0; | |
567 | int namelen; | |
568 | int mod = 0; | |
569 | ||
c146afad YZ |
570 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
571 | return -EROFS; | |
572 | ||
e441d54d CM |
573 | if (!capable(CAP_SYS_ADMIN)) |
574 | return -EPERM; | |
575 | ||
dae7b665 LZ |
576 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
577 | if (IS_ERR(vol_args)) | |
578 | return PTR_ERR(vol_args); | |
5516e595 MF |
579 | |
580 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 581 | namelen = strlen(vol_args->name); |
f46b5a66 | 582 | |
7d9eb12c | 583 | mutex_lock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
584 | sizestr = vol_args->name; |
585 | devstr = strchr(sizestr, ':'); | |
586 | if (devstr) { | |
587 | char *end; | |
588 | sizestr = devstr + 1; | |
589 | *devstr = '\0'; | |
590 | devstr = vol_args->name; | |
591 | devid = simple_strtoull(devstr, &end, 10); | |
21380931 JB |
592 | printk(KERN_INFO "resizing devid %llu\n", |
593 | (unsigned long long)devid); | |
f46b5a66 | 594 | } |
2b82032c | 595 | device = btrfs_find_device(root, devid, NULL, NULL); |
f46b5a66 | 596 | if (!device) { |
21380931 JB |
597 | printk(KERN_INFO "resizer unable to find device %llu\n", |
598 | (unsigned long long)devid); | |
f46b5a66 CH |
599 | ret = -EINVAL; |
600 | goto out_unlock; | |
601 | } | |
602 | if (!strcmp(sizestr, "max")) | |
603 | new_size = device->bdev->bd_inode->i_size; | |
604 | else { | |
605 | if (sizestr[0] == '-') { | |
606 | mod = -1; | |
607 | sizestr++; | |
608 | } else if (sizestr[0] == '+') { | |
609 | mod = 1; | |
610 | sizestr++; | |
611 | } | |
612 | new_size = btrfs_parse_size(sizestr); | |
613 | if (new_size == 0) { | |
614 | ret = -EINVAL; | |
615 | goto out_unlock; | |
616 | } | |
617 | } | |
618 | ||
619 | old_size = device->total_bytes; | |
620 | ||
621 | if (mod < 0) { | |
622 | if (new_size > old_size) { | |
623 | ret = -EINVAL; | |
624 | goto out_unlock; | |
625 | } | |
626 | new_size = old_size - new_size; | |
627 | } else if (mod > 0) { | |
628 | new_size = old_size + new_size; | |
629 | } | |
630 | ||
631 | if (new_size < 256 * 1024 * 1024) { | |
632 | ret = -EINVAL; | |
633 | goto out_unlock; | |
634 | } | |
635 | if (new_size > device->bdev->bd_inode->i_size) { | |
636 | ret = -EFBIG; | |
637 | goto out_unlock; | |
638 | } | |
639 | ||
640 | do_div(new_size, root->sectorsize); | |
641 | new_size *= root->sectorsize; | |
642 | ||
643 | printk(KERN_INFO "new size for %s is %llu\n", | |
644 | device->name, (unsigned long long)new_size); | |
645 | ||
646 | if (new_size > old_size) { | |
647 | trans = btrfs_start_transaction(root, 1); | |
648 | ret = btrfs_grow_device(trans, device, new_size); | |
649 | btrfs_commit_transaction(trans, root); | |
650 | } else { | |
651 | ret = btrfs_shrink_device(device, new_size); | |
652 | } | |
653 | ||
654 | out_unlock: | |
7d9eb12c | 655 | mutex_unlock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
656 | kfree(vol_args); |
657 | return ret; | |
658 | } | |
659 | ||
cb8e7090 | 660 | static noinline int btrfs_ioctl_snap_create(struct file *file, |
3de4586c | 661 | void __user *arg, int subvol) |
f46b5a66 | 662 | { |
cb8e7090 | 663 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
f46b5a66 | 664 | struct btrfs_ioctl_vol_args *vol_args; |
3de4586c | 665 | struct file *src_file; |
f46b5a66 | 666 | int namelen; |
3de4586c | 667 | int ret = 0; |
f46b5a66 | 668 | |
c146afad YZ |
669 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
670 | return -EROFS; | |
671 | ||
dae7b665 LZ |
672 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
673 | if (IS_ERR(vol_args)) | |
674 | return PTR_ERR(vol_args); | |
f46b5a66 | 675 | |
5516e595 | 676 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 | 677 | namelen = strlen(vol_args->name); |
f46b5a66 CH |
678 | if (strchr(vol_args->name, '/')) { |
679 | ret = -EINVAL; | |
680 | goto out; | |
681 | } | |
682 | ||
3de4586c | 683 | if (subvol) { |
76dda93c YZ |
684 | ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, |
685 | NULL); | |
cb8e7090 | 686 | } else { |
3de4586c CM |
687 | struct inode *src_inode; |
688 | src_file = fget(vol_args->fd); | |
689 | if (!src_file) { | |
690 | ret = -EINVAL; | |
691 | goto out; | |
692 | } | |
693 | ||
694 | src_inode = src_file->f_path.dentry->d_inode; | |
695 | if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { | |
d397712b CM |
696 | printk(KERN_INFO "btrfs: Snapshot src from " |
697 | "another FS\n"); | |
3de4586c CM |
698 | ret = -EINVAL; |
699 | fput(src_file); | |
700 | goto out; | |
701 | } | |
76dda93c YZ |
702 | ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, |
703 | BTRFS_I(src_inode)->root); | |
3de4586c | 704 | fput(src_file); |
cb8e7090 | 705 | } |
f46b5a66 CH |
706 | out: |
707 | kfree(vol_args); | |
708 | return ret; | |
709 | } | |
710 | ||
76dda93c YZ |
711 | /* |
712 | * helper to check if the subvolume references other subvolumes | |
713 | */ | |
714 | static noinline int may_destroy_subvol(struct btrfs_root *root) | |
715 | { | |
716 | struct btrfs_path *path; | |
717 | struct btrfs_key key; | |
718 | int ret; | |
719 | ||
720 | path = btrfs_alloc_path(); | |
721 | if (!path) | |
722 | return -ENOMEM; | |
723 | ||
724 | key.objectid = root->root_key.objectid; | |
725 | key.type = BTRFS_ROOT_REF_KEY; | |
726 | key.offset = (u64)-1; | |
727 | ||
728 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, | |
729 | &key, path, 0, 0); | |
730 | if (ret < 0) | |
731 | goto out; | |
732 | BUG_ON(ret == 0); | |
733 | ||
734 | ret = 0; | |
735 | if (path->slots[0] > 0) { | |
736 | path->slots[0]--; | |
737 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
738 | if (key.objectid == root->root_key.objectid && | |
739 | key.type == BTRFS_ROOT_REF_KEY) | |
740 | ret = -ENOTEMPTY; | |
741 | } | |
742 | out: | |
743 | btrfs_free_path(path); | |
744 | return ret; | |
745 | } | |
746 | ||
ac8e9819 CM |
747 | static noinline int key_in_sk(struct btrfs_key *key, |
748 | struct btrfs_ioctl_search_key *sk) | |
749 | { | |
750 | if (key->objectid < sk->min_objectid) | |
751 | return 0; | |
752 | if (key->offset < sk->min_offset) | |
753 | return 0; | |
754 | if (key->type < sk->min_type) | |
755 | return 0; | |
756 | if (key->objectid > sk->max_objectid) | |
757 | return 0; | |
758 | if (key->type > sk->max_type) | |
759 | return 0; | |
760 | if (key->offset > sk->max_offset) | |
761 | return 0; | |
762 | return 1; | |
763 | } | |
764 | ||
765 | static noinline int copy_to_sk(struct btrfs_root *root, | |
766 | struct btrfs_path *path, | |
767 | struct btrfs_key *key, | |
768 | struct btrfs_ioctl_search_key *sk, | |
769 | char *buf, | |
770 | unsigned long *sk_offset, | |
771 | int *num_found) | |
772 | { | |
773 | u64 found_transid; | |
774 | struct extent_buffer *leaf; | |
775 | struct btrfs_ioctl_search_header sh; | |
776 | unsigned long item_off; | |
777 | unsigned long item_len; | |
778 | int nritems; | |
779 | int i; | |
780 | int slot; | |
781 | int found = 0; | |
782 | int ret = 0; | |
783 | ||
784 | leaf = path->nodes[0]; | |
785 | slot = path->slots[0]; | |
786 | nritems = btrfs_header_nritems(leaf); | |
787 | ||
788 | if (btrfs_header_generation(leaf) > sk->max_transid) { | |
789 | i = nritems; | |
790 | goto advance_key; | |
791 | } | |
792 | found_transid = btrfs_header_generation(leaf); | |
793 | ||
794 | for (i = slot; i < nritems; i++) { | |
795 | item_off = btrfs_item_ptr_offset(leaf, i); | |
796 | item_len = btrfs_item_size_nr(leaf, i); | |
797 | ||
798 | if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) | |
799 | item_len = 0; | |
800 | ||
801 | if (sizeof(sh) + item_len + *sk_offset > | |
802 | BTRFS_SEARCH_ARGS_BUFSIZE) { | |
803 | ret = 1; | |
804 | goto overflow; | |
805 | } | |
806 | ||
807 | btrfs_item_key_to_cpu(leaf, key, i); | |
808 | if (!key_in_sk(key, sk)) | |
809 | continue; | |
810 | ||
811 | sh.objectid = key->objectid; | |
812 | sh.offset = key->offset; | |
813 | sh.type = key->type; | |
814 | sh.len = item_len; | |
815 | sh.transid = found_transid; | |
816 | ||
817 | /* copy search result header */ | |
818 | memcpy(buf + *sk_offset, &sh, sizeof(sh)); | |
819 | *sk_offset += sizeof(sh); | |
820 | ||
821 | if (item_len) { | |
822 | char *p = buf + *sk_offset; | |
823 | /* copy the item */ | |
824 | read_extent_buffer(leaf, p, | |
825 | item_off, item_len); | |
826 | *sk_offset += item_len; | |
827 | found++; | |
828 | } | |
829 | ||
830 | if (*num_found >= sk->nr_items) | |
831 | break; | |
832 | } | |
833 | advance_key: | |
834 | if (key->offset < (u64)-1) | |
835 | key->offset++; | |
836 | else if (key->type < (u64)-1) | |
837 | key->type++; | |
838 | else if (key->objectid < (u64)-1) | |
839 | key->objectid++; | |
840 | ret = 0; | |
841 | overflow: | |
842 | *num_found += found; | |
843 | return ret; | |
844 | } | |
845 | ||
846 | static noinline int search_ioctl(struct inode *inode, | |
847 | struct btrfs_ioctl_search_args *args) | |
848 | { | |
849 | struct btrfs_root *root; | |
850 | struct btrfs_key key; | |
851 | struct btrfs_key max_key; | |
852 | struct btrfs_path *path; | |
853 | struct btrfs_ioctl_search_key *sk = &args->key; | |
854 | struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; | |
855 | int ret; | |
856 | int num_found = 0; | |
857 | unsigned long sk_offset = 0; | |
858 | ||
859 | path = btrfs_alloc_path(); | |
860 | if (!path) | |
861 | return -ENOMEM; | |
862 | ||
863 | if (sk->tree_id == 0) { | |
864 | /* search the root of the inode that was passed */ | |
865 | root = BTRFS_I(inode)->root; | |
866 | } else { | |
867 | key.objectid = sk->tree_id; | |
868 | key.type = BTRFS_ROOT_ITEM_KEY; | |
869 | key.offset = (u64)-1; | |
870 | root = btrfs_read_fs_root_no_name(info, &key); | |
871 | if (IS_ERR(root)) { | |
872 | printk(KERN_ERR "could not find root %llu\n", | |
873 | sk->tree_id); | |
874 | btrfs_free_path(path); | |
875 | return -ENOENT; | |
876 | } | |
877 | } | |
878 | ||
879 | key.objectid = sk->min_objectid; | |
880 | key.type = sk->min_type; | |
881 | key.offset = sk->min_offset; | |
882 | ||
883 | max_key.objectid = sk->max_objectid; | |
884 | max_key.type = sk->max_type; | |
885 | max_key.offset = sk->max_offset; | |
886 | ||
887 | path->keep_locks = 1; | |
888 | ||
889 | while(1) { | |
890 | ret = btrfs_search_forward(root, &key, &max_key, path, 0, | |
891 | sk->min_transid); | |
892 | if (ret != 0) { | |
893 | if (ret > 0) | |
894 | ret = 0; | |
895 | goto err; | |
896 | } | |
897 | ret = copy_to_sk(root, path, &key, sk, args->buf, | |
898 | &sk_offset, &num_found); | |
899 | btrfs_release_path(root, path); | |
900 | if (ret || num_found >= sk->nr_items) | |
901 | break; | |
902 | ||
903 | } | |
904 | ret = 0; | |
905 | err: | |
906 | sk->nr_items = num_found; | |
907 | btrfs_free_path(path); | |
908 | return ret; | |
909 | } | |
910 | ||
911 | static noinline int btrfs_ioctl_tree_search(struct file *file, | |
912 | void __user *argp) | |
913 | { | |
914 | struct btrfs_ioctl_search_args *args; | |
915 | struct inode *inode; | |
916 | int ret; | |
917 | ||
918 | if (!capable(CAP_SYS_ADMIN)) | |
919 | return -EPERM; | |
920 | ||
921 | args = kmalloc(sizeof(*args), GFP_KERNEL); | |
922 | if (!args) | |
923 | return -ENOMEM; | |
924 | ||
925 | if (copy_from_user(args, argp, sizeof(*args))) { | |
926 | kfree(args); | |
927 | return -EFAULT; | |
928 | } | |
929 | inode = fdentry(file)->d_inode; | |
930 | ret = search_ioctl(inode, args); | |
931 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
932 | ret = -EFAULT; | |
933 | kfree(args); | |
934 | return ret; | |
935 | } | |
936 | ||
98d377a0 | 937 | /* |
ac8e9819 CM |
938 | * Search INODE_REFs to identify path name of 'dirid' directory |
939 | * in a 'tree_id' tree. and sets path name to 'name'. | |
940 | */ | |
98d377a0 TH |
941 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
942 | u64 tree_id, u64 dirid, char *name) | |
943 | { | |
944 | struct btrfs_root *root; | |
945 | struct btrfs_key key; | |
ac8e9819 | 946 | char *ptr; |
98d377a0 TH |
947 | int ret = -1; |
948 | int slot; | |
949 | int len; | |
950 | int total_len = 0; | |
951 | struct btrfs_inode_ref *iref; | |
952 | struct extent_buffer *l; | |
953 | struct btrfs_path *path; | |
954 | ||
955 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { | |
956 | name[0]='\0'; | |
957 | return 0; | |
958 | } | |
959 | ||
960 | path = btrfs_alloc_path(); | |
961 | if (!path) | |
962 | return -ENOMEM; | |
963 | ||
ac8e9819 | 964 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; |
98d377a0 TH |
965 | |
966 | key.objectid = tree_id; | |
967 | key.type = BTRFS_ROOT_ITEM_KEY; | |
968 | key.offset = (u64)-1; | |
969 | root = btrfs_read_fs_root_no_name(info, &key); | |
970 | if (IS_ERR(root)) { | |
971 | printk(KERN_ERR "could not find root %llu\n", tree_id); | |
972 | return -ENOENT; | |
973 | } | |
974 | ||
975 | key.objectid = dirid; | |
976 | key.type = BTRFS_INODE_REF_KEY; | |
977 | key.offset = 0; | |
978 | ||
979 | while(1) { | |
980 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
981 | if (ret < 0) | |
982 | goto out; | |
983 | ||
984 | l = path->nodes[0]; | |
985 | slot = path->slots[0]; | |
986 | btrfs_item_key_to_cpu(l, &key, slot); | |
987 | ||
988 | if (ret > 0 && (key.objectid != dirid || | |
ac8e9819 CM |
989 | key.type != BTRFS_INODE_REF_KEY)) { |
990 | ret = -ENOENT; | |
98d377a0 | 991 | goto out; |
ac8e9819 | 992 | } |
98d377a0 TH |
993 | |
994 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); | |
995 | len = btrfs_inode_ref_name_len(l, iref); | |
996 | ptr -= len + 1; | |
997 | total_len += len + 1; | |
ac8e9819 | 998 | if (ptr < name) |
98d377a0 TH |
999 | goto out; |
1000 | ||
1001 | *(ptr + len) = '/'; | |
1002 | read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); | |
1003 | ||
1004 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) | |
1005 | break; | |
1006 | ||
1007 | btrfs_release_path(root, path); | |
1008 | key.objectid = key.offset; | |
1009 | key.offset = 0; | |
1010 | dirid = key.objectid; | |
1011 | ||
1012 | } | |
ac8e9819 | 1013 | if (ptr < name) |
98d377a0 | 1014 | goto out; |
ac8e9819 | 1015 | memcpy(name, ptr, total_len); |
98d377a0 TH |
1016 | name[total_len]='\0'; |
1017 | ret = 0; | |
1018 | out: | |
1019 | btrfs_free_path(path); | |
ac8e9819 CM |
1020 | return ret; |
1021 | } | |
1022 | ||
1023 | static noinline int btrfs_ioctl_ino_lookup(struct file *file, | |
1024 | void __user *argp) | |
1025 | { | |
1026 | struct btrfs_ioctl_ino_lookup_args *args; | |
1027 | struct inode *inode; | |
1028 | int ret; | |
1029 | ||
1030 | if (!capable(CAP_SYS_ADMIN)) | |
1031 | return -EPERM; | |
1032 | ||
1033 | args = kmalloc(sizeof(*args), GFP_KERNEL); | |
1034 | if (copy_from_user(args, argp, sizeof(*args))) { | |
1035 | kfree(args); | |
1036 | return -EFAULT; | |
1037 | } | |
1038 | inode = fdentry(file)->d_inode; | |
1039 | ||
1040 | ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, | |
1041 | args->treeid, args->objectid, | |
1042 | args->name); | |
1043 | ||
1044 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
1045 | ret = -EFAULT; | |
1046 | ||
1047 | kfree(args); | |
98d377a0 TH |
1048 | return ret; |
1049 | } | |
1050 | ||
76dda93c YZ |
1051 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
1052 | void __user *arg) | |
1053 | { | |
1054 | struct dentry *parent = fdentry(file); | |
1055 | struct dentry *dentry; | |
1056 | struct inode *dir = parent->d_inode; | |
1057 | struct inode *inode; | |
1058 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1059 | struct btrfs_root *dest = NULL; | |
1060 | struct btrfs_ioctl_vol_args *vol_args; | |
1061 | struct btrfs_trans_handle *trans; | |
1062 | int namelen; | |
1063 | int ret; | |
1064 | int err = 0; | |
1065 | ||
1066 | if (!capable(CAP_SYS_ADMIN)) | |
1067 | return -EPERM; | |
1068 | ||
1069 | vol_args = memdup_user(arg, sizeof(*vol_args)); | |
1070 | if (IS_ERR(vol_args)) | |
1071 | return PTR_ERR(vol_args); | |
1072 | ||
1073 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
1074 | namelen = strlen(vol_args->name); | |
1075 | if (strchr(vol_args->name, '/') || | |
1076 | strncmp(vol_args->name, "..", namelen) == 0) { | |
1077 | err = -EINVAL; | |
1078 | goto out; | |
1079 | } | |
1080 | ||
1081 | err = mnt_want_write(file->f_path.mnt); | |
1082 | if (err) | |
1083 | goto out; | |
1084 | ||
1085 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
1086 | dentry = lookup_one_len(vol_args->name, parent, namelen); | |
1087 | if (IS_ERR(dentry)) { | |
1088 | err = PTR_ERR(dentry); | |
1089 | goto out_unlock_dir; | |
1090 | } | |
1091 | ||
1092 | if (!dentry->d_inode) { | |
1093 | err = -ENOENT; | |
1094 | goto out_dput; | |
1095 | } | |
1096 | ||
1097 | inode = dentry->d_inode; | |
1098 | if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { | |
1099 | err = -EINVAL; | |
1100 | goto out_dput; | |
1101 | } | |
1102 | ||
1103 | dest = BTRFS_I(inode)->root; | |
1104 | ||
1105 | mutex_lock(&inode->i_mutex); | |
1106 | err = d_invalidate(dentry); | |
1107 | if (err) | |
1108 | goto out_unlock; | |
1109 | ||
1110 | down_write(&root->fs_info->subvol_sem); | |
1111 | ||
1112 | err = may_destroy_subvol(dest); | |
1113 | if (err) | |
1114 | goto out_up_write; | |
1115 | ||
1116 | trans = btrfs_start_transaction(root, 1); | |
1117 | ret = btrfs_unlink_subvol(trans, root, dir, | |
1118 | dest->root_key.objectid, | |
1119 | dentry->d_name.name, | |
1120 | dentry->d_name.len); | |
1121 | BUG_ON(ret); | |
1122 | ||
1123 | btrfs_record_root_in_trans(trans, dest); | |
1124 | ||
1125 | memset(&dest->root_item.drop_progress, 0, | |
1126 | sizeof(dest->root_item.drop_progress)); | |
1127 | dest->root_item.drop_level = 0; | |
1128 | btrfs_set_root_refs(&dest->root_item, 0); | |
1129 | ||
1130 | ret = btrfs_insert_orphan_item(trans, | |
1131 | root->fs_info->tree_root, | |
1132 | dest->root_key.objectid); | |
1133 | BUG_ON(ret); | |
1134 | ||
1135 | ret = btrfs_commit_transaction(trans, root); | |
1136 | BUG_ON(ret); | |
1137 | inode->i_flags |= S_DEAD; | |
1138 | out_up_write: | |
1139 | up_write(&root->fs_info->subvol_sem); | |
1140 | out_unlock: | |
1141 | mutex_unlock(&inode->i_mutex); | |
1142 | if (!err) { | |
efefb143 | 1143 | shrink_dcache_sb(root->fs_info->sb); |
76dda93c YZ |
1144 | btrfs_invalidate_inodes(dest); |
1145 | d_delete(dentry); | |
1146 | } | |
1147 | out_dput: | |
1148 | dput(dentry); | |
1149 | out_unlock_dir: | |
1150 | mutex_unlock(&dir->i_mutex); | |
1151 | mnt_drop_write(file->f_path.mnt); | |
1152 | out: | |
1153 | kfree(vol_args); | |
1154 | return err; | |
1155 | } | |
1156 | ||
f46b5a66 CH |
1157 | static int btrfs_ioctl_defrag(struct file *file) |
1158 | { | |
1159 | struct inode *inode = fdentry(file)->d_inode; | |
1160 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
c146afad YZ |
1161 | int ret; |
1162 | ||
1163 | ret = mnt_want_write(file->f_path.mnt); | |
1164 | if (ret) | |
1165 | return ret; | |
f46b5a66 CH |
1166 | |
1167 | switch (inode->i_mode & S_IFMT) { | |
1168 | case S_IFDIR: | |
e441d54d CM |
1169 | if (!capable(CAP_SYS_ADMIN)) { |
1170 | ret = -EPERM; | |
1171 | goto out; | |
1172 | } | |
f46b5a66 CH |
1173 | btrfs_defrag_root(root, 0); |
1174 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
f46b5a66 CH |
1175 | break; |
1176 | case S_IFREG: | |
e441d54d CM |
1177 | if (!(file->f_mode & FMODE_WRITE)) { |
1178 | ret = -EINVAL; | |
1179 | goto out; | |
1180 | } | |
f46b5a66 CH |
1181 | btrfs_defrag_file(file); |
1182 | break; | |
1183 | } | |
e441d54d | 1184 | out: |
ab67b7c1 | 1185 | mnt_drop_write(file->f_path.mnt); |
e441d54d | 1186 | return ret; |
f46b5a66 CH |
1187 | } |
1188 | ||
b2950863 | 1189 | static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
1190 | { |
1191 | struct btrfs_ioctl_vol_args *vol_args; | |
1192 | int ret; | |
1193 | ||
e441d54d CM |
1194 | if (!capable(CAP_SYS_ADMIN)) |
1195 | return -EPERM; | |
1196 | ||
dae7b665 LZ |
1197 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1198 | if (IS_ERR(vol_args)) | |
1199 | return PTR_ERR(vol_args); | |
f46b5a66 | 1200 | |
5516e595 | 1201 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
1202 | ret = btrfs_init_new_device(root, vol_args->name); |
1203 | ||
f46b5a66 CH |
1204 | kfree(vol_args); |
1205 | return ret; | |
1206 | } | |
1207 | ||
b2950863 | 1208 | static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
1209 | { |
1210 | struct btrfs_ioctl_vol_args *vol_args; | |
1211 | int ret; | |
1212 | ||
e441d54d CM |
1213 | if (!capable(CAP_SYS_ADMIN)) |
1214 | return -EPERM; | |
1215 | ||
c146afad YZ |
1216 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
1217 | return -EROFS; | |
1218 | ||
dae7b665 LZ |
1219 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1220 | if (IS_ERR(vol_args)) | |
1221 | return PTR_ERR(vol_args); | |
f46b5a66 | 1222 | |
5516e595 | 1223 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
1224 | ret = btrfs_rm_device(root, vol_args->name); |
1225 | ||
f46b5a66 CH |
1226 | kfree(vol_args); |
1227 | return ret; | |
1228 | } | |
1229 | ||
76dda93c YZ |
1230 | static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, |
1231 | u64 off, u64 olen, u64 destoff) | |
f46b5a66 CH |
1232 | { |
1233 | struct inode *inode = fdentry(file)->d_inode; | |
1234 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1235 | struct file *src_file; | |
1236 | struct inode *src; | |
1237 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 1238 | struct btrfs_path *path; |
f46b5a66 | 1239 | struct extent_buffer *leaf; |
ae01a0ab YZ |
1240 | char *buf; |
1241 | struct btrfs_key key; | |
f46b5a66 CH |
1242 | u32 nritems; |
1243 | int slot; | |
ae01a0ab | 1244 | int ret; |
c5c9cd4d SW |
1245 | u64 len = olen; |
1246 | u64 bs = root->fs_info->sb->s_blocksize; | |
1247 | u64 hint_byte; | |
d20f7043 | 1248 | |
c5c9cd4d SW |
1249 | /* |
1250 | * TODO: | |
1251 | * - split compressed inline extents. annoying: we need to | |
1252 | * decompress into destination's address_space (the file offset | |
1253 | * may change, so source mapping won't do), then recompress (or | |
1254 | * otherwise reinsert) a subrange. | |
1255 | * - allow ranges within the same file to be cloned (provided | |
1256 | * they don't overlap)? | |
1257 | */ | |
1258 | ||
e441d54d CM |
1259 | /* the destination must be opened for writing */ |
1260 | if (!(file->f_mode & FMODE_WRITE)) | |
1261 | return -EINVAL; | |
1262 | ||
c146afad YZ |
1263 | ret = mnt_want_write(file->f_path.mnt); |
1264 | if (ret) | |
1265 | return ret; | |
1266 | ||
c5c9cd4d | 1267 | src_file = fget(srcfd); |
ab67b7c1 YZ |
1268 | if (!src_file) { |
1269 | ret = -EBADF; | |
1270 | goto out_drop_write; | |
1271 | } | |
f46b5a66 CH |
1272 | src = src_file->f_dentry->d_inode; |
1273 | ||
c5c9cd4d SW |
1274 | ret = -EINVAL; |
1275 | if (src == inode) | |
1276 | goto out_fput; | |
1277 | ||
ae01a0ab YZ |
1278 | ret = -EISDIR; |
1279 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) | |
1280 | goto out_fput; | |
1281 | ||
f46b5a66 | 1282 | ret = -EXDEV; |
ae01a0ab YZ |
1283 | if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) |
1284 | goto out_fput; | |
1285 | ||
1286 | ret = -ENOMEM; | |
1287 | buf = vmalloc(btrfs_level_size(root, 0)); | |
1288 | if (!buf) | |
1289 | goto out_fput; | |
1290 | ||
1291 | path = btrfs_alloc_path(); | |
1292 | if (!path) { | |
1293 | vfree(buf); | |
f46b5a66 | 1294 | goto out_fput; |
ae01a0ab YZ |
1295 | } |
1296 | path->reada = 2; | |
f46b5a66 CH |
1297 | |
1298 | if (inode < src) { | |
1299 | mutex_lock(&inode->i_mutex); | |
1300 | mutex_lock(&src->i_mutex); | |
1301 | } else { | |
1302 | mutex_lock(&src->i_mutex); | |
1303 | mutex_lock(&inode->i_mutex); | |
1304 | } | |
1305 | ||
c5c9cd4d SW |
1306 | /* determine range to clone */ |
1307 | ret = -EINVAL; | |
1308 | if (off >= src->i_size || off + len > src->i_size) | |
f46b5a66 | 1309 | goto out_unlock; |
c5c9cd4d SW |
1310 | if (len == 0) |
1311 | olen = len = src->i_size - off; | |
1312 | /* if we extend to eof, continue to block boundary */ | |
1313 | if (off + len == src->i_size) | |
1314 | len = ((src->i_size + bs-1) & ~(bs-1)) | |
1315 | - off; | |
1316 | ||
1317 | /* verify the end result is block aligned */ | |
1318 | if ((off & (bs-1)) || | |
1319 | ((off + len) & (bs-1))) | |
1320 | goto out_unlock; | |
1321 | ||
f46b5a66 CH |
1322 | /* do any pending delalloc/csum calc on src, one way or |
1323 | another, and lock file content */ | |
1324 | while (1) { | |
31840ae1 | 1325 | struct btrfs_ordered_extent *ordered; |
c5c9cd4d SW |
1326 | lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
1327 | ordered = btrfs_lookup_first_ordered_extent(inode, off+len); | |
ae01a0ab | 1328 | if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) |
f46b5a66 | 1329 | break; |
c5c9cd4d | 1330 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
ae01a0ab YZ |
1331 | if (ordered) |
1332 | btrfs_put_ordered_extent(ordered); | |
c5c9cd4d | 1333 | btrfs_wait_ordered_range(src, off, off+len); |
f46b5a66 CH |
1334 | } |
1335 | ||
ae01a0ab YZ |
1336 | trans = btrfs_start_transaction(root, 1); |
1337 | BUG_ON(!trans); | |
1338 | ||
c5c9cd4d | 1339 | /* punch hole in destination first */ |
920bbbfb | 1340 | btrfs_drop_extents(trans, inode, off, off + len, &hint_byte, 1); |
c5c9cd4d SW |
1341 | |
1342 | /* clone data */ | |
f46b5a66 | 1343 | key.objectid = src->i_ino; |
ae01a0ab YZ |
1344 | key.type = BTRFS_EXTENT_DATA_KEY; |
1345 | key.offset = 0; | |
f46b5a66 CH |
1346 | |
1347 | while (1) { | |
1348 | /* | |
1349 | * note the key will change type as we walk through the | |
1350 | * tree. | |
1351 | */ | |
1352 | ret = btrfs_search_slot(trans, root, &key, path, 0, 0); | |
1353 | if (ret < 0) | |
1354 | goto out; | |
1355 | ||
ae01a0ab YZ |
1356 | nritems = btrfs_header_nritems(path->nodes[0]); |
1357 | if (path->slots[0] >= nritems) { | |
f46b5a66 CH |
1358 | ret = btrfs_next_leaf(root, path); |
1359 | if (ret < 0) | |
1360 | goto out; | |
1361 | if (ret > 0) | |
1362 | break; | |
ae01a0ab | 1363 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
1364 | } |
1365 | leaf = path->nodes[0]; | |
1366 | slot = path->slots[0]; | |
f46b5a66 | 1367 | |
ae01a0ab | 1368 | btrfs_item_key_to_cpu(leaf, &key, slot); |
d20f7043 | 1369 | if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || |
f46b5a66 CH |
1370 | key.objectid != src->i_ino) |
1371 | break; | |
1372 | ||
c5c9cd4d SW |
1373 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
1374 | struct btrfs_file_extent_item *extent; | |
1375 | int type; | |
31840ae1 ZY |
1376 | u32 size; |
1377 | struct btrfs_key new_key; | |
c5c9cd4d SW |
1378 | u64 disko = 0, diskl = 0; |
1379 | u64 datao = 0, datal = 0; | |
1380 | u8 comp; | |
31840ae1 ZY |
1381 | |
1382 | size = btrfs_item_size_nr(leaf, slot); | |
1383 | read_extent_buffer(leaf, buf, | |
1384 | btrfs_item_ptr_offset(leaf, slot), | |
1385 | size); | |
c5c9cd4d SW |
1386 | |
1387 | extent = btrfs_item_ptr(leaf, slot, | |
1388 | struct btrfs_file_extent_item); | |
1389 | comp = btrfs_file_extent_compression(leaf, extent); | |
1390 | type = btrfs_file_extent_type(leaf, extent); | |
c8a894d7 CM |
1391 | if (type == BTRFS_FILE_EXTENT_REG || |
1392 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d397712b CM |
1393 | disko = btrfs_file_extent_disk_bytenr(leaf, |
1394 | extent); | |
1395 | diskl = btrfs_file_extent_disk_num_bytes(leaf, | |
1396 | extent); | |
c5c9cd4d | 1397 | datao = btrfs_file_extent_offset(leaf, extent); |
d397712b CM |
1398 | datal = btrfs_file_extent_num_bytes(leaf, |
1399 | extent); | |
c5c9cd4d SW |
1400 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
1401 | /* take upper bound, may be compressed */ | |
1402 | datal = btrfs_file_extent_ram_bytes(leaf, | |
1403 | extent); | |
1404 | } | |
31840ae1 ZY |
1405 | btrfs_release_path(root, path); |
1406 | ||
c5c9cd4d SW |
1407 | if (key.offset + datal < off || |
1408 | key.offset >= off+len) | |
1409 | goto next; | |
1410 | ||
31840ae1 ZY |
1411 | memcpy(&new_key, &key, sizeof(new_key)); |
1412 | new_key.objectid = inode->i_ino; | |
c5c9cd4d | 1413 | new_key.offset = key.offset + destoff - off; |
31840ae1 | 1414 | |
c8a894d7 CM |
1415 | if (type == BTRFS_FILE_EXTENT_REG || |
1416 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
c5c9cd4d SW |
1417 | ret = btrfs_insert_empty_item(trans, root, path, |
1418 | &new_key, size); | |
1419 | if (ret) | |
1420 | goto out; | |
1421 | ||
1422 | leaf = path->nodes[0]; | |
1423 | slot = path->slots[0]; | |
1424 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
1425 | btrfs_item_ptr_offset(leaf, slot), |
1426 | size); | |
ae01a0ab | 1427 | |
c5c9cd4d | 1428 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 1429 | struct btrfs_file_extent_item); |
c5c9cd4d SW |
1430 | |
1431 | if (off > key.offset) { | |
1432 | datao += off - key.offset; | |
1433 | datal -= off - key.offset; | |
1434 | } | |
ac6889cb CM |
1435 | |
1436 | if (key.offset + datal > off + len) | |
1437 | datal = off + len - key.offset; | |
1438 | ||
c5c9cd4d SW |
1439 | /* disko == 0 means it's a hole */ |
1440 | if (!disko) | |
1441 | datao = 0; | |
c5c9cd4d SW |
1442 | |
1443 | btrfs_set_file_extent_offset(leaf, extent, | |
1444 | datao); | |
1445 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
1446 | datal); | |
1447 | if (disko) { | |
1448 | inode_add_bytes(inode, datal); | |
ae01a0ab | 1449 | ret = btrfs_inc_extent_ref(trans, root, |
5d4f98a2 YZ |
1450 | disko, diskl, 0, |
1451 | root->root_key.objectid, | |
1452 | inode->i_ino, | |
1453 | new_key.offset - datao); | |
31840ae1 | 1454 | BUG_ON(ret); |
f46b5a66 | 1455 | } |
c5c9cd4d SW |
1456 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
1457 | u64 skip = 0; | |
1458 | u64 trim = 0; | |
1459 | if (off > key.offset) { | |
1460 | skip = off - key.offset; | |
1461 | new_key.offset += skip; | |
1462 | } | |
d397712b | 1463 | |
c5c9cd4d SW |
1464 | if (key.offset + datal > off+len) |
1465 | trim = key.offset + datal - (off+len); | |
d397712b | 1466 | |
c5c9cd4d | 1467 | if (comp && (skip || trim)) { |
c5c9cd4d SW |
1468 | ret = -EINVAL; |
1469 | goto out; | |
1470 | } | |
1471 | size -= skip + trim; | |
1472 | datal -= skip + trim; | |
1473 | ret = btrfs_insert_empty_item(trans, root, path, | |
1474 | &new_key, size); | |
1475 | if (ret) | |
1476 | goto out; | |
1477 | ||
1478 | if (skip) { | |
d397712b CM |
1479 | u32 start = |
1480 | btrfs_file_extent_calc_inline_size(0); | |
c5c9cd4d SW |
1481 | memmove(buf+start, buf+start+skip, |
1482 | datal); | |
1483 | } | |
1484 | ||
1485 | leaf = path->nodes[0]; | |
1486 | slot = path->slots[0]; | |
1487 | write_extent_buffer(leaf, buf, | |
1488 | btrfs_item_ptr_offset(leaf, slot), | |
1489 | size); | |
1490 | inode_add_bytes(inode, datal); | |
f46b5a66 | 1491 | } |
c5c9cd4d SW |
1492 | |
1493 | btrfs_mark_buffer_dirty(leaf); | |
ae01a0ab | 1494 | } |
c5c9cd4d | 1495 | |
d397712b | 1496 | next: |
31840ae1 | 1497 | btrfs_release_path(root, path); |
f46b5a66 | 1498 | key.offset++; |
f46b5a66 | 1499 | } |
f46b5a66 CH |
1500 | ret = 0; |
1501 | out: | |
ae01a0ab YZ |
1502 | btrfs_release_path(root, path); |
1503 | if (ret == 0) { | |
1504 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
c5c9cd4d SW |
1505 | if (destoff + olen > inode->i_size) |
1506 | btrfs_i_size_write(inode, destoff + olen); | |
ae01a0ab YZ |
1507 | BTRFS_I(inode)->flags = BTRFS_I(src)->flags; |
1508 | ret = btrfs_update_inode(trans, root, inode); | |
1509 | } | |
f46b5a66 | 1510 | btrfs_end_transaction(trans, root); |
c5c9cd4d | 1511 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
ae01a0ab YZ |
1512 | if (ret) |
1513 | vmtruncate(inode, 0); | |
f46b5a66 CH |
1514 | out_unlock: |
1515 | mutex_unlock(&src->i_mutex); | |
1516 | mutex_unlock(&inode->i_mutex); | |
ae01a0ab YZ |
1517 | vfree(buf); |
1518 | btrfs_free_path(path); | |
f46b5a66 CH |
1519 | out_fput: |
1520 | fput(src_file); | |
ab67b7c1 YZ |
1521 | out_drop_write: |
1522 | mnt_drop_write(file->f_path.mnt); | |
f46b5a66 CH |
1523 | return ret; |
1524 | } | |
1525 | ||
7a865e8a | 1526 | static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) |
c5c9cd4d SW |
1527 | { |
1528 | struct btrfs_ioctl_clone_range_args args; | |
1529 | ||
7a865e8a | 1530 | if (copy_from_user(&args, argp, sizeof(args))) |
c5c9cd4d SW |
1531 | return -EFAULT; |
1532 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, | |
1533 | args.src_length, args.dest_offset); | |
1534 | } | |
1535 | ||
f46b5a66 CH |
1536 | /* |
1537 | * there are many ways the trans_start and trans_end ioctls can lead | |
1538 | * to deadlocks. They should only be used by applications that | |
1539 | * basically own the machine, and have a very in depth understanding | |
1540 | * of all the possible deadlocks and enospc problems. | |
1541 | */ | |
b2950863 | 1542 | static long btrfs_ioctl_trans_start(struct file *file) |
f46b5a66 CH |
1543 | { |
1544 | struct inode *inode = fdentry(file)->d_inode; | |
1545 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1546 | struct btrfs_trans_handle *trans; | |
1ab86aed | 1547 | int ret; |
f46b5a66 | 1548 | |
1ab86aed | 1549 | ret = -EPERM; |
df5b5520 | 1550 | if (!capable(CAP_SYS_ADMIN)) |
1ab86aed | 1551 | goto out; |
df5b5520 | 1552 | |
1ab86aed SW |
1553 | ret = -EINPROGRESS; |
1554 | if (file->private_data) | |
f46b5a66 | 1555 | goto out; |
9ca9ee09 | 1556 | |
c146afad YZ |
1557 | ret = mnt_want_write(file->f_path.mnt); |
1558 | if (ret) | |
1559 | goto out; | |
1560 | ||
9ca9ee09 SW |
1561 | mutex_lock(&root->fs_info->trans_mutex); |
1562 | root->fs_info->open_ioctl_trans++; | |
1563 | mutex_unlock(&root->fs_info->trans_mutex); | |
1564 | ||
1ab86aed | 1565 | ret = -ENOMEM; |
9ca9ee09 | 1566 | trans = btrfs_start_ioctl_transaction(root, 0); |
1ab86aed SW |
1567 | if (!trans) |
1568 | goto out_drop; | |
1569 | ||
1570 | file->private_data = trans; | |
1571 | return 0; | |
1572 | ||
1573 | out_drop: | |
1574 | mutex_lock(&root->fs_info->trans_mutex); | |
1575 | root->fs_info->open_ioctl_trans--; | |
1576 | mutex_unlock(&root->fs_info->trans_mutex); | |
1577 | mnt_drop_write(file->f_path.mnt); | |
f46b5a66 | 1578 | out: |
f46b5a66 CH |
1579 | return ret; |
1580 | } | |
1581 | ||
6ef5ed0d JB |
1582 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
1583 | { | |
1584 | struct inode *inode = fdentry(file)->d_inode; | |
1585 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1586 | struct btrfs_root *new_root; | |
1587 | struct btrfs_dir_item *di; | |
1588 | struct btrfs_trans_handle *trans; | |
1589 | struct btrfs_path *path; | |
1590 | struct btrfs_key location; | |
1591 | struct btrfs_disk_key disk_key; | |
1592 | struct btrfs_super_block *disk_super; | |
1593 | u64 features; | |
1594 | u64 objectid = 0; | |
1595 | u64 dir_id; | |
1596 | ||
1597 | if (!capable(CAP_SYS_ADMIN)) | |
1598 | return -EPERM; | |
1599 | ||
1600 | if (copy_from_user(&objectid, argp, sizeof(objectid))) | |
1601 | return -EFAULT; | |
1602 | ||
1603 | if (!objectid) | |
1604 | objectid = root->root_key.objectid; | |
1605 | ||
1606 | location.objectid = objectid; | |
1607 | location.type = BTRFS_ROOT_ITEM_KEY; | |
1608 | location.offset = (u64)-1; | |
1609 | ||
1610 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
1611 | if (IS_ERR(new_root)) | |
1612 | return PTR_ERR(new_root); | |
1613 | ||
1614 | if (btrfs_root_refs(&new_root->root_item) == 0) | |
1615 | return -ENOENT; | |
1616 | ||
1617 | path = btrfs_alloc_path(); | |
1618 | if (!path) | |
1619 | return -ENOMEM; | |
1620 | path->leave_spinning = 1; | |
1621 | ||
1622 | trans = btrfs_start_transaction(root, 1); | |
1623 | if (!trans) { | |
1624 | btrfs_free_path(path); | |
1625 | return -ENOMEM; | |
1626 | } | |
1627 | ||
1628 | dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); | |
1629 | di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, | |
1630 | dir_id, "default", 7, 1); | |
1631 | if (!di) { | |
1632 | btrfs_free_path(path); | |
1633 | btrfs_end_transaction(trans, root); | |
1634 | printk(KERN_ERR "Umm, you don't have the default dir item, " | |
1635 | "this isn't going to work\n"); | |
1636 | return -ENOENT; | |
1637 | } | |
1638 | ||
1639 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); | |
1640 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); | |
1641 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
1642 | btrfs_free_path(path); | |
1643 | ||
1644 | disk_super = &root->fs_info->super_copy; | |
1645 | features = btrfs_super_incompat_flags(disk_super); | |
1646 | if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { | |
1647 | features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; | |
1648 | btrfs_set_super_incompat_flags(disk_super, features); | |
1649 | } | |
1650 | btrfs_end_transaction(trans, root); | |
1651 | ||
1652 | return 0; | |
1653 | } | |
1654 | ||
f46b5a66 CH |
1655 | /* |
1656 | * there are many ways the trans_start and trans_end ioctls can lead | |
1657 | * to deadlocks. They should only be used by applications that | |
1658 | * basically own the machine, and have a very in depth understanding | |
1659 | * of all the possible deadlocks and enospc problems. | |
1660 | */ | |
1661 | long btrfs_ioctl_trans_end(struct file *file) | |
1662 | { | |
1663 | struct inode *inode = fdentry(file)->d_inode; | |
1664 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1665 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 1666 | |
f46b5a66 | 1667 | trans = file->private_data; |
1ab86aed SW |
1668 | if (!trans) |
1669 | return -EINVAL; | |
b214107e | 1670 | file->private_data = NULL; |
9ca9ee09 | 1671 | |
1ab86aed SW |
1672 | btrfs_end_transaction(trans, root); |
1673 | ||
9ca9ee09 SW |
1674 | mutex_lock(&root->fs_info->trans_mutex); |
1675 | root->fs_info->open_ioctl_trans--; | |
1676 | mutex_unlock(&root->fs_info->trans_mutex); | |
1677 | ||
cfc8ea87 | 1678 | mnt_drop_write(file->f_path.mnt); |
1ab86aed | 1679 | return 0; |
f46b5a66 CH |
1680 | } |
1681 | ||
1682 | long btrfs_ioctl(struct file *file, unsigned int | |
1683 | cmd, unsigned long arg) | |
1684 | { | |
1685 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; | |
4bcabaa3 | 1686 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
1687 | |
1688 | switch (cmd) { | |
6cbff00f CH |
1689 | case FS_IOC_GETFLAGS: |
1690 | return btrfs_ioctl_getflags(file, argp); | |
1691 | case FS_IOC_SETFLAGS: | |
1692 | return btrfs_ioctl_setflags(file, argp); | |
1693 | case FS_IOC_GETVERSION: | |
1694 | return btrfs_ioctl_getversion(file, argp); | |
f46b5a66 | 1695 | case BTRFS_IOC_SNAP_CREATE: |
4bcabaa3 | 1696 | return btrfs_ioctl_snap_create(file, argp, 0); |
3de4586c | 1697 | case BTRFS_IOC_SUBVOL_CREATE: |
4bcabaa3 | 1698 | return btrfs_ioctl_snap_create(file, argp, 1); |
76dda93c YZ |
1699 | case BTRFS_IOC_SNAP_DESTROY: |
1700 | return btrfs_ioctl_snap_destroy(file, argp); | |
6ef5ed0d JB |
1701 | case BTRFS_IOC_DEFAULT_SUBVOL: |
1702 | return btrfs_ioctl_default_subvol(file, argp); | |
f46b5a66 CH |
1703 | case BTRFS_IOC_DEFRAG: |
1704 | return btrfs_ioctl_defrag(file); | |
1705 | case BTRFS_IOC_RESIZE: | |
4bcabaa3 | 1706 | return btrfs_ioctl_resize(root, argp); |
f46b5a66 | 1707 | case BTRFS_IOC_ADD_DEV: |
4bcabaa3 | 1708 | return btrfs_ioctl_add_dev(root, argp); |
f46b5a66 | 1709 | case BTRFS_IOC_RM_DEV: |
4bcabaa3 | 1710 | return btrfs_ioctl_rm_dev(root, argp); |
f46b5a66 CH |
1711 | case BTRFS_IOC_BALANCE: |
1712 | return btrfs_balance(root->fs_info->dev_root); | |
1713 | case BTRFS_IOC_CLONE: | |
c5c9cd4d SW |
1714 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
1715 | case BTRFS_IOC_CLONE_RANGE: | |
7a865e8a | 1716 | return btrfs_ioctl_clone_range(file, argp); |
f46b5a66 CH |
1717 | case BTRFS_IOC_TRANS_START: |
1718 | return btrfs_ioctl_trans_start(file); | |
1719 | case BTRFS_IOC_TRANS_END: | |
1720 | return btrfs_ioctl_trans_end(file); | |
ac8e9819 CM |
1721 | case BTRFS_IOC_TREE_SEARCH: |
1722 | return btrfs_ioctl_tree_search(file, argp); | |
1723 | case BTRFS_IOC_INO_LOOKUP: | |
1724 | return btrfs_ioctl_ino_lookup(file, argp); | |
f46b5a66 CH |
1725 | case BTRFS_IOC_SYNC: |
1726 | btrfs_sync_fs(file->f_dentry->d_sb, 1); | |
1727 | return 0; | |
1728 | } | |
1729 | ||
1730 | return -ENOTTY; | |
1731 | } |