Commit | Line | Data |
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f46b5a66 CH |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/bio.h> | |
21 | #include <linux/buffer_head.h> | |
22 | #include <linux/file.h> | |
23 | #include <linux/fs.h> | |
cb8e7090 | 24 | #include <linux/fsnotify.h> |
f46b5a66 CH |
25 | #include <linux/pagemap.h> |
26 | #include <linux/highmem.h> | |
27 | #include <linux/time.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/string.h> | |
f46b5a66 | 30 | #include <linux/backing-dev.h> |
cb8e7090 | 31 | #include <linux/mount.h> |
f46b5a66 | 32 | #include <linux/mpage.h> |
cb8e7090 | 33 | #include <linux/namei.h> |
f46b5a66 CH |
34 | #include <linux/swap.h> |
35 | #include <linux/writeback.h> | |
36 | #include <linux/statfs.h> | |
37 | #include <linux/compat.h> | |
38 | #include <linux/bit_spinlock.h> | |
cb8e7090 | 39 | #include <linux/security.h> |
f46b5a66 | 40 | #include <linux/xattr.h> |
7ea394f1 | 41 | #include <linux/vmalloc.h> |
5a0e3ad6 | 42 | #include <linux/slab.h> |
f7039b1d | 43 | #include <linux/blkdev.h> |
4b4e25f2 | 44 | #include "compat.h" |
f46b5a66 CH |
45 | #include "ctree.h" |
46 | #include "disk-io.h" | |
47 | #include "transaction.h" | |
48 | #include "btrfs_inode.h" | |
49 | #include "ioctl.h" | |
50 | #include "print-tree.h" | |
51 | #include "volumes.h" | |
925baedd | 52 | #include "locking.h" |
581bb050 | 53 | #include "inode-map.h" |
f46b5a66 | 54 | |
6cbff00f CH |
55 | /* Mask out flags that are inappropriate for the given type of inode. */ |
56 | static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) | |
57 | { | |
58 | if (S_ISDIR(mode)) | |
59 | return flags; | |
60 | else if (S_ISREG(mode)) | |
61 | return flags & ~FS_DIRSYNC_FL; | |
62 | else | |
63 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); | |
64 | } | |
65 | ||
66 | /* | |
67 | * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. | |
68 | */ | |
69 | static unsigned int btrfs_flags_to_ioctl(unsigned int flags) | |
70 | { | |
71 | unsigned int iflags = 0; | |
72 | ||
73 | if (flags & BTRFS_INODE_SYNC) | |
74 | iflags |= FS_SYNC_FL; | |
75 | if (flags & BTRFS_INODE_IMMUTABLE) | |
76 | iflags |= FS_IMMUTABLE_FL; | |
77 | if (flags & BTRFS_INODE_APPEND) | |
78 | iflags |= FS_APPEND_FL; | |
79 | if (flags & BTRFS_INODE_NODUMP) | |
80 | iflags |= FS_NODUMP_FL; | |
81 | if (flags & BTRFS_INODE_NOATIME) | |
82 | iflags |= FS_NOATIME_FL; | |
83 | if (flags & BTRFS_INODE_DIRSYNC) | |
84 | iflags |= FS_DIRSYNC_FL; | |
d0092bdd LZ |
85 | if (flags & BTRFS_INODE_NODATACOW) |
86 | iflags |= FS_NOCOW_FL; | |
87 | ||
88 | if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) | |
89 | iflags |= FS_COMPR_FL; | |
90 | else if (flags & BTRFS_INODE_NOCOMPRESS) | |
91 | iflags |= FS_NOCOMP_FL; | |
6cbff00f CH |
92 | |
93 | return iflags; | |
94 | } | |
95 | ||
96 | /* | |
97 | * Update inode->i_flags based on the btrfs internal flags. | |
98 | */ | |
99 | void btrfs_update_iflags(struct inode *inode) | |
100 | { | |
101 | struct btrfs_inode *ip = BTRFS_I(inode); | |
102 | ||
103 | inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
104 | ||
105 | if (ip->flags & BTRFS_INODE_SYNC) | |
106 | inode->i_flags |= S_SYNC; | |
107 | if (ip->flags & BTRFS_INODE_IMMUTABLE) | |
108 | inode->i_flags |= S_IMMUTABLE; | |
109 | if (ip->flags & BTRFS_INODE_APPEND) | |
110 | inode->i_flags |= S_APPEND; | |
111 | if (ip->flags & BTRFS_INODE_NOATIME) | |
112 | inode->i_flags |= S_NOATIME; | |
113 | if (ip->flags & BTRFS_INODE_DIRSYNC) | |
114 | inode->i_flags |= S_DIRSYNC; | |
115 | } | |
116 | ||
117 | /* | |
118 | * Inherit flags from the parent inode. | |
119 | * | |
e27425d6 | 120 | * Currently only the compression flags and the cow flags are inherited. |
6cbff00f CH |
121 | */ |
122 | void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) | |
123 | { | |
0b4dcea5 CM |
124 | unsigned int flags; |
125 | ||
126 | if (!dir) | |
127 | return; | |
128 | ||
129 | flags = BTRFS_I(dir)->flags; | |
6cbff00f | 130 | |
e27425d6 JB |
131 | if (flags & BTRFS_INODE_NOCOMPRESS) { |
132 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; | |
133 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; | |
134 | } else if (flags & BTRFS_INODE_COMPRESS) { | |
135 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
136 | BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; | |
137 | } | |
138 | ||
139 | if (flags & BTRFS_INODE_NODATACOW) | |
140 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; | |
6cbff00f | 141 | |
6cbff00f CH |
142 | btrfs_update_iflags(inode); |
143 | } | |
144 | ||
145 | static int btrfs_ioctl_getflags(struct file *file, void __user *arg) | |
146 | { | |
147 | struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); | |
148 | unsigned int flags = btrfs_flags_to_ioctl(ip->flags); | |
149 | ||
150 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
151 | return -EFAULT; | |
152 | return 0; | |
153 | } | |
154 | ||
75e7cb7f LB |
155 | static int check_flags(unsigned int flags) |
156 | { | |
157 | if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ | |
158 | FS_NOATIME_FL | FS_NODUMP_FL | \ | |
159 | FS_SYNC_FL | FS_DIRSYNC_FL | \ | |
e1e8fb6a LZ |
160 | FS_NOCOMP_FL | FS_COMPR_FL | |
161 | FS_NOCOW_FL)) | |
75e7cb7f LB |
162 | return -EOPNOTSUPP; |
163 | ||
164 | if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) | |
165 | return -EINVAL; | |
166 | ||
75e7cb7f LB |
167 | return 0; |
168 | } | |
169 | ||
6cbff00f CH |
170 | static int btrfs_ioctl_setflags(struct file *file, void __user *arg) |
171 | { | |
172 | struct inode *inode = file->f_path.dentry->d_inode; | |
173 | struct btrfs_inode *ip = BTRFS_I(inode); | |
174 | struct btrfs_root *root = ip->root; | |
175 | struct btrfs_trans_handle *trans; | |
176 | unsigned int flags, oldflags; | |
177 | int ret; | |
178 | ||
b83cc969 LZ |
179 | if (btrfs_root_readonly(root)) |
180 | return -EROFS; | |
181 | ||
6cbff00f CH |
182 | if (copy_from_user(&flags, arg, sizeof(flags))) |
183 | return -EFAULT; | |
184 | ||
75e7cb7f LB |
185 | ret = check_flags(flags); |
186 | if (ret) | |
187 | return ret; | |
f46b5a66 | 188 | |
2e149670 | 189 | if (!inode_owner_or_capable(inode)) |
6cbff00f CH |
190 | return -EACCES; |
191 | ||
192 | mutex_lock(&inode->i_mutex); | |
193 | ||
194 | flags = btrfs_mask_flags(inode->i_mode, flags); | |
195 | oldflags = btrfs_flags_to_ioctl(ip->flags); | |
196 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { | |
197 | if (!capable(CAP_LINUX_IMMUTABLE)) { | |
198 | ret = -EPERM; | |
199 | goto out_unlock; | |
200 | } | |
201 | } | |
202 | ||
203 | ret = mnt_want_write(file->f_path.mnt); | |
204 | if (ret) | |
205 | goto out_unlock; | |
206 | ||
207 | if (flags & FS_SYNC_FL) | |
208 | ip->flags |= BTRFS_INODE_SYNC; | |
209 | else | |
210 | ip->flags &= ~BTRFS_INODE_SYNC; | |
211 | if (flags & FS_IMMUTABLE_FL) | |
212 | ip->flags |= BTRFS_INODE_IMMUTABLE; | |
213 | else | |
214 | ip->flags &= ~BTRFS_INODE_IMMUTABLE; | |
215 | if (flags & FS_APPEND_FL) | |
216 | ip->flags |= BTRFS_INODE_APPEND; | |
217 | else | |
218 | ip->flags &= ~BTRFS_INODE_APPEND; | |
219 | if (flags & FS_NODUMP_FL) | |
220 | ip->flags |= BTRFS_INODE_NODUMP; | |
221 | else | |
222 | ip->flags &= ~BTRFS_INODE_NODUMP; | |
223 | if (flags & FS_NOATIME_FL) | |
224 | ip->flags |= BTRFS_INODE_NOATIME; | |
225 | else | |
226 | ip->flags &= ~BTRFS_INODE_NOATIME; | |
227 | if (flags & FS_DIRSYNC_FL) | |
228 | ip->flags |= BTRFS_INODE_DIRSYNC; | |
229 | else | |
230 | ip->flags &= ~BTRFS_INODE_DIRSYNC; | |
e1e8fb6a LZ |
231 | if (flags & FS_NOCOW_FL) |
232 | ip->flags |= BTRFS_INODE_NODATACOW; | |
233 | else | |
234 | ip->flags &= ~BTRFS_INODE_NODATACOW; | |
6cbff00f | 235 | |
75e7cb7f LB |
236 | /* |
237 | * The COMPRESS flag can only be changed by users, while the NOCOMPRESS | |
238 | * flag may be changed automatically if compression code won't make | |
239 | * things smaller. | |
240 | */ | |
241 | if (flags & FS_NOCOMP_FL) { | |
242 | ip->flags &= ~BTRFS_INODE_COMPRESS; | |
243 | ip->flags |= BTRFS_INODE_NOCOMPRESS; | |
244 | } else if (flags & FS_COMPR_FL) { | |
245 | ip->flags |= BTRFS_INODE_COMPRESS; | |
246 | ip->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
ebcb904d LZ |
247 | } else { |
248 | ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); | |
75e7cb7f | 249 | } |
6cbff00f | 250 | |
7a7eaa40 | 251 | trans = btrfs_join_transaction(root); |
3612b495 | 252 | BUG_ON(IS_ERR(trans)); |
6cbff00f CH |
253 | |
254 | ret = btrfs_update_inode(trans, root, inode); | |
255 | BUG_ON(ret); | |
256 | ||
257 | btrfs_update_iflags(inode); | |
258 | inode->i_ctime = CURRENT_TIME; | |
259 | btrfs_end_transaction(trans, root); | |
260 | ||
261 | mnt_drop_write(file->f_path.mnt); | |
2d4e6f6a | 262 | |
263 | ret = 0; | |
6cbff00f CH |
264 | out_unlock: |
265 | mutex_unlock(&inode->i_mutex); | |
2d4e6f6a | 266 | return ret; |
6cbff00f CH |
267 | } |
268 | ||
269 | static int btrfs_ioctl_getversion(struct file *file, int __user *arg) | |
270 | { | |
271 | struct inode *inode = file->f_path.dentry->d_inode; | |
272 | ||
273 | return put_user(inode->i_generation, arg); | |
274 | } | |
f46b5a66 | 275 | |
f7039b1d LD |
276 | static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) |
277 | { | |
278 | struct btrfs_root *root = fdentry(file)->d_sb->s_fs_info; | |
279 | struct btrfs_fs_info *fs_info = root->fs_info; | |
280 | struct btrfs_device *device; | |
281 | struct request_queue *q; | |
282 | struct fstrim_range range; | |
283 | u64 minlen = ULLONG_MAX; | |
284 | u64 num_devices = 0; | |
6c41761f | 285 | u64 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy); |
f7039b1d LD |
286 | int ret; |
287 | ||
288 | if (!capable(CAP_SYS_ADMIN)) | |
289 | return -EPERM; | |
290 | ||
1f78160c XG |
291 | rcu_read_lock(); |
292 | list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, | |
293 | dev_list) { | |
f7039b1d LD |
294 | if (!device->bdev) |
295 | continue; | |
296 | q = bdev_get_queue(device->bdev); | |
297 | if (blk_queue_discard(q)) { | |
298 | num_devices++; | |
299 | minlen = min((u64)q->limits.discard_granularity, | |
300 | minlen); | |
301 | } | |
302 | } | |
1f78160c | 303 | rcu_read_unlock(); |
f4c697e6 | 304 | |
f7039b1d LD |
305 | if (!num_devices) |
306 | return -EOPNOTSUPP; | |
f7039b1d LD |
307 | if (copy_from_user(&range, arg, sizeof(range))) |
308 | return -EFAULT; | |
f4c697e6 LC |
309 | if (range.start > total_bytes) |
310 | return -EINVAL; | |
f7039b1d | 311 | |
f4c697e6 | 312 | range.len = min(range.len, total_bytes - range.start); |
f7039b1d LD |
313 | range.minlen = max(range.minlen, minlen); |
314 | ret = btrfs_trim_fs(root, &range); | |
315 | if (ret < 0) | |
316 | return ret; | |
317 | ||
318 | if (copy_to_user(arg, &range, sizeof(range))) | |
319 | return -EFAULT; | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
cb8e7090 CH |
324 | static noinline int create_subvol(struct btrfs_root *root, |
325 | struct dentry *dentry, | |
72fd032e SW |
326 | char *name, int namelen, |
327 | u64 *async_transid) | |
f46b5a66 CH |
328 | { |
329 | struct btrfs_trans_handle *trans; | |
330 | struct btrfs_key key; | |
331 | struct btrfs_root_item root_item; | |
332 | struct btrfs_inode_item *inode_item; | |
333 | struct extent_buffer *leaf; | |
76dda93c | 334 | struct btrfs_root *new_root; |
2fbe8c8a | 335 | struct dentry *parent = dentry->d_parent; |
6a912213 | 336 | struct inode *dir; |
f46b5a66 CH |
337 | int ret; |
338 | int err; | |
339 | u64 objectid; | |
340 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
3de4586c | 341 | u64 index = 0; |
f46b5a66 | 342 | |
581bb050 | 343 | ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); |
2fbe8c8a | 344 | if (ret) |
a22285a6 | 345 | return ret; |
6a912213 JB |
346 | |
347 | dir = parent->d_inode; | |
348 | ||
9ed74f2d JB |
349 | /* |
350 | * 1 - inode item | |
351 | * 2 - refs | |
352 | * 1 - root item | |
353 | * 2 - dir items | |
354 | */ | |
a22285a6 | 355 | trans = btrfs_start_transaction(root, 6); |
2fbe8c8a | 356 | if (IS_ERR(trans)) |
a22285a6 | 357 | return PTR_ERR(trans); |
f46b5a66 | 358 | |
5d4f98a2 YZ |
359 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, |
360 | 0, objectid, NULL, 0, 0, 0); | |
8e8a1e31 JB |
361 | if (IS_ERR(leaf)) { |
362 | ret = PTR_ERR(leaf); | |
363 | goto fail; | |
364 | } | |
f46b5a66 | 365 | |
5d4f98a2 | 366 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
f46b5a66 CH |
367 | btrfs_set_header_bytenr(leaf, leaf->start); |
368 | btrfs_set_header_generation(leaf, trans->transid); | |
5d4f98a2 | 369 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); |
f46b5a66 CH |
370 | btrfs_set_header_owner(leaf, objectid); |
371 | ||
372 | write_extent_buffer(leaf, root->fs_info->fsid, | |
373 | (unsigned long)btrfs_header_fsid(leaf), | |
374 | BTRFS_FSID_SIZE); | |
5d4f98a2 YZ |
375 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, |
376 | (unsigned long)btrfs_header_chunk_tree_uuid(leaf), | |
377 | BTRFS_UUID_SIZE); | |
f46b5a66 CH |
378 | btrfs_mark_buffer_dirty(leaf); |
379 | ||
380 | inode_item = &root_item.inode; | |
381 | memset(inode_item, 0, sizeof(*inode_item)); | |
382 | inode_item->generation = cpu_to_le64(1); | |
383 | inode_item->size = cpu_to_le64(3); | |
384 | inode_item->nlink = cpu_to_le32(1); | |
a76a3cd4 | 385 | inode_item->nbytes = cpu_to_le64(root->leafsize); |
f46b5a66 CH |
386 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); |
387 | ||
08fe4db1 LZ |
388 | root_item.flags = 0; |
389 | root_item.byte_limit = 0; | |
390 | inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT); | |
391 | ||
f46b5a66 | 392 | btrfs_set_root_bytenr(&root_item, leaf->start); |
84234f3a | 393 | btrfs_set_root_generation(&root_item, trans->transid); |
f46b5a66 CH |
394 | btrfs_set_root_level(&root_item, 0); |
395 | btrfs_set_root_refs(&root_item, 1); | |
86b9f2ec | 396 | btrfs_set_root_used(&root_item, leaf->len); |
80ff3856 | 397 | btrfs_set_root_last_snapshot(&root_item, 0); |
f46b5a66 CH |
398 | |
399 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); | |
400 | root_item.drop_level = 0; | |
401 | ||
925baedd | 402 | btrfs_tree_unlock(leaf); |
f46b5a66 CH |
403 | free_extent_buffer(leaf); |
404 | leaf = NULL; | |
405 | ||
406 | btrfs_set_root_dirid(&root_item, new_dirid); | |
407 | ||
408 | key.objectid = objectid; | |
5d4f98a2 | 409 | key.offset = 0; |
f46b5a66 CH |
410 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
411 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
412 | &root_item); | |
413 | if (ret) | |
414 | goto fail; | |
415 | ||
76dda93c YZ |
416 | key.offset = (u64)-1; |
417 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); | |
418 | BUG_ON(IS_ERR(new_root)); | |
419 | ||
420 | btrfs_record_root_in_trans(trans, new_root); | |
421 | ||
d82a6f1d | 422 | ret = btrfs_create_subvol_root(trans, new_root, new_dirid); |
f46b5a66 CH |
423 | /* |
424 | * insert the directory item | |
425 | */ | |
3de4586c CM |
426 | ret = btrfs_set_inode_index(dir, &index); |
427 | BUG_ON(ret); | |
428 | ||
429 | ret = btrfs_insert_dir_item(trans, root, | |
16cdcec7 | 430 | name, namelen, dir, &key, |
3de4586c | 431 | BTRFS_FT_DIR, index); |
f46b5a66 CH |
432 | if (ret) |
433 | goto fail; | |
0660b5af | 434 | |
52c26179 YZ |
435 | btrfs_i_size_write(dir, dir->i_size + namelen * 2); |
436 | ret = btrfs_update_inode(trans, root, dir); | |
437 | BUG_ON(ret); | |
438 | ||
0660b5af | 439 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
4df27c4d | 440 | objectid, root->root_key.objectid, |
33345d01 | 441 | btrfs_ino(dir), index, name, namelen); |
0660b5af | 442 | |
76dda93c | 443 | BUG_ON(ret); |
f46b5a66 | 444 | |
76dda93c | 445 | d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); |
f46b5a66 | 446 | fail: |
72fd032e SW |
447 | if (async_transid) { |
448 | *async_transid = trans->transid; | |
449 | err = btrfs_commit_transaction_async(trans, root, 1); | |
450 | } else { | |
451 | err = btrfs_commit_transaction(trans, root); | |
452 | } | |
f46b5a66 CH |
453 | if (err && !ret) |
454 | ret = err; | |
f46b5a66 CH |
455 | return ret; |
456 | } | |
457 | ||
72fd032e | 458 | static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, |
b83cc969 LZ |
459 | char *name, int namelen, u64 *async_transid, |
460 | bool readonly) | |
f46b5a66 | 461 | { |
2e4bfab9 | 462 | struct inode *inode; |
f46b5a66 CH |
463 | struct btrfs_pending_snapshot *pending_snapshot; |
464 | struct btrfs_trans_handle *trans; | |
2e4bfab9 | 465 | int ret; |
f46b5a66 CH |
466 | |
467 | if (!root->ref_cows) | |
468 | return -EINVAL; | |
469 | ||
3de4586c | 470 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
a22285a6 YZ |
471 | if (!pending_snapshot) |
472 | return -ENOMEM; | |
473 | ||
474 | btrfs_init_block_rsv(&pending_snapshot->block_rsv); | |
3de4586c | 475 | pending_snapshot->dentry = dentry; |
f46b5a66 | 476 | pending_snapshot->root = root; |
b83cc969 | 477 | pending_snapshot->readonly = readonly; |
a22285a6 YZ |
478 | |
479 | trans = btrfs_start_transaction(root->fs_info->extent_root, 5); | |
480 | if (IS_ERR(trans)) { | |
481 | ret = PTR_ERR(trans); | |
482 | goto fail; | |
483 | } | |
484 | ||
485 | ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); | |
486 | BUG_ON(ret); | |
487 | ||
8351583e | 488 | spin_lock(&root->fs_info->trans_lock); |
f46b5a66 CH |
489 | list_add(&pending_snapshot->list, |
490 | &trans->transaction->pending_snapshots); | |
8351583e | 491 | spin_unlock(&root->fs_info->trans_lock); |
72fd032e SW |
492 | if (async_transid) { |
493 | *async_transid = trans->transid; | |
494 | ret = btrfs_commit_transaction_async(trans, | |
495 | root->fs_info->extent_root, 1); | |
496 | } else { | |
497 | ret = btrfs_commit_transaction(trans, | |
498 | root->fs_info->extent_root); | |
499 | } | |
2e4bfab9 | 500 | BUG_ON(ret); |
a22285a6 YZ |
501 | |
502 | ret = pending_snapshot->error; | |
503 | if (ret) | |
504 | goto fail; | |
505 | ||
66b4ffd1 JB |
506 | ret = btrfs_orphan_cleanup(pending_snapshot->snap); |
507 | if (ret) | |
508 | goto fail; | |
f46b5a66 | 509 | |
2fbe8c8a | 510 | inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); |
2e4bfab9 YZ |
511 | if (IS_ERR(inode)) { |
512 | ret = PTR_ERR(inode); | |
513 | goto fail; | |
514 | } | |
515 | BUG_ON(!inode); | |
516 | d_instantiate(dentry, inode); | |
517 | ret = 0; | |
518 | fail: | |
a22285a6 | 519 | kfree(pending_snapshot); |
f46b5a66 CH |
520 | return ret; |
521 | } | |
522 | ||
4260f7c7 SW |
523 | /* copy of check_sticky in fs/namei.c() |
524 | * It's inline, so penalty for filesystems that don't use sticky bit is | |
525 | * minimal. | |
526 | */ | |
527 | static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) | |
528 | { | |
529 | uid_t fsuid = current_fsuid(); | |
530 | ||
531 | if (!(dir->i_mode & S_ISVTX)) | |
532 | return 0; | |
533 | if (inode->i_uid == fsuid) | |
534 | return 0; | |
535 | if (dir->i_uid == fsuid) | |
536 | return 0; | |
537 | return !capable(CAP_FOWNER); | |
538 | } | |
539 | ||
540 | /* copy of may_delete in fs/namei.c() | |
541 | * Check whether we can remove a link victim from directory dir, check | |
542 | * whether the type of victim is right. | |
543 | * 1. We can't do it if dir is read-only (done in permission()) | |
544 | * 2. We should have write and exec permissions on dir | |
545 | * 3. We can't remove anything from append-only dir | |
546 | * 4. We can't do anything with immutable dir (done in permission()) | |
547 | * 5. If the sticky bit on dir is set we should either | |
548 | * a. be owner of dir, or | |
549 | * b. be owner of victim, or | |
550 | * c. have CAP_FOWNER capability | |
551 | * 6. If the victim is append-only or immutable we can't do antyhing with | |
552 | * links pointing to it. | |
553 | * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. | |
554 | * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. | |
555 | * 9. We can't remove a root or mountpoint. | |
556 | * 10. We don't allow removal of NFS sillyrenamed files; it's handled by | |
557 | * nfs_async_unlink(). | |
558 | */ | |
559 | ||
560 | static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) | |
561 | { | |
562 | int error; | |
563 | ||
564 | if (!victim->d_inode) | |
565 | return -ENOENT; | |
566 | ||
567 | BUG_ON(victim->d_parent->d_inode != dir); | |
568 | audit_inode_child(victim, dir); | |
569 | ||
570 | error = inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
571 | if (error) | |
572 | return error; | |
573 | if (IS_APPEND(dir)) | |
574 | return -EPERM; | |
575 | if (btrfs_check_sticky(dir, victim->d_inode)|| | |
576 | IS_APPEND(victim->d_inode)|| | |
577 | IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) | |
578 | return -EPERM; | |
579 | if (isdir) { | |
580 | if (!S_ISDIR(victim->d_inode->i_mode)) | |
581 | return -ENOTDIR; | |
582 | if (IS_ROOT(victim)) | |
583 | return -EBUSY; | |
584 | } else if (S_ISDIR(victim->d_inode->i_mode)) | |
585 | return -EISDIR; | |
586 | if (IS_DEADDIR(dir)) | |
587 | return -ENOENT; | |
588 | if (victim->d_flags & DCACHE_NFSFS_RENAMED) | |
589 | return -EBUSY; | |
590 | return 0; | |
591 | } | |
592 | ||
cb8e7090 CH |
593 | /* copy of may_create in fs/namei.c() */ |
594 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
595 | { | |
596 | if (child->d_inode) | |
597 | return -EEXIST; | |
598 | if (IS_DEADDIR(dir)) | |
599 | return -ENOENT; | |
600 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
601 | } | |
602 | ||
603 | /* | |
604 | * Create a new subvolume below @parent. This is largely modeled after | |
605 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
606 | * inside this filesystem so it's quite a bit simpler. | |
607 | */ | |
76dda93c YZ |
608 | static noinline int btrfs_mksubvol(struct path *parent, |
609 | char *name, int namelen, | |
72fd032e | 610 | struct btrfs_root *snap_src, |
b83cc969 | 611 | u64 *async_transid, bool readonly) |
cb8e7090 | 612 | { |
76dda93c | 613 | struct inode *dir = parent->dentry->d_inode; |
cb8e7090 CH |
614 | struct dentry *dentry; |
615 | int error; | |
616 | ||
76dda93c | 617 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
cb8e7090 CH |
618 | |
619 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
620 | error = PTR_ERR(dentry); | |
621 | if (IS_ERR(dentry)) | |
622 | goto out_unlock; | |
623 | ||
624 | error = -EEXIST; | |
625 | if (dentry->d_inode) | |
626 | goto out_dput; | |
627 | ||
cb8e7090 CH |
628 | error = mnt_want_write(parent->mnt); |
629 | if (error) | |
630 | goto out_dput; | |
631 | ||
76dda93c | 632 | error = btrfs_may_create(dir, dentry); |
cb8e7090 CH |
633 | if (error) |
634 | goto out_drop_write; | |
635 | ||
76dda93c YZ |
636 | down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); |
637 | ||
638 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) | |
639 | goto out_up_read; | |
640 | ||
3de4586c | 641 | if (snap_src) { |
72fd032e | 642 | error = create_snapshot(snap_src, dentry, |
b83cc969 | 643 | name, namelen, async_transid, readonly); |
3de4586c | 644 | } else { |
76dda93c | 645 | error = create_subvol(BTRFS_I(dir)->root, dentry, |
72fd032e | 646 | name, namelen, async_transid); |
3de4586c | 647 | } |
76dda93c YZ |
648 | if (!error) |
649 | fsnotify_mkdir(dir, dentry); | |
650 | out_up_read: | |
651 | up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); | |
cb8e7090 CH |
652 | out_drop_write: |
653 | mnt_drop_write(parent->mnt); | |
654 | out_dput: | |
655 | dput(dentry); | |
656 | out_unlock: | |
76dda93c | 657 | mutex_unlock(&dir->i_mutex); |
cb8e7090 CH |
658 | return error; |
659 | } | |
660 | ||
4cb5300b CM |
661 | /* |
662 | * When we're defragging a range, we don't want to kick it off again | |
663 | * if it is really just waiting for delalloc to send it down. | |
664 | * If we find a nice big extent or delalloc range for the bytes in the | |
665 | * file you want to defrag, we return 0 to let you know to skip this | |
666 | * part of the file | |
667 | */ | |
668 | static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) | |
669 | { | |
670 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
671 | struct extent_map *em = NULL; | |
672 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
673 | u64 end; | |
674 | ||
675 | read_lock(&em_tree->lock); | |
676 | em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); | |
677 | read_unlock(&em_tree->lock); | |
678 | ||
679 | if (em) { | |
680 | end = extent_map_end(em); | |
681 | free_extent_map(em); | |
682 | if (end - offset > thresh) | |
683 | return 0; | |
684 | } | |
685 | /* if we already have a nice delalloc here, just stop */ | |
686 | thresh /= 2; | |
687 | end = count_range_bits(io_tree, &offset, offset + thresh, | |
688 | thresh, EXTENT_DELALLOC, 1); | |
689 | if (end >= thresh) | |
690 | return 0; | |
691 | return 1; | |
692 | } | |
693 | ||
694 | /* | |
695 | * helper function to walk through a file and find extents | |
696 | * newer than a specific transid, and smaller than thresh. | |
697 | * | |
698 | * This is used by the defragging code to find new and small | |
699 | * extents | |
700 | */ | |
701 | static int find_new_extents(struct btrfs_root *root, | |
702 | struct inode *inode, u64 newer_than, | |
703 | u64 *off, int thresh) | |
704 | { | |
705 | struct btrfs_path *path; | |
706 | struct btrfs_key min_key; | |
707 | struct btrfs_key max_key; | |
708 | struct extent_buffer *leaf; | |
709 | struct btrfs_file_extent_item *extent; | |
710 | int type; | |
711 | int ret; | |
a4689d2b | 712 | u64 ino = btrfs_ino(inode); |
4cb5300b CM |
713 | |
714 | path = btrfs_alloc_path(); | |
715 | if (!path) | |
716 | return -ENOMEM; | |
717 | ||
a4689d2b | 718 | min_key.objectid = ino; |
4cb5300b CM |
719 | min_key.type = BTRFS_EXTENT_DATA_KEY; |
720 | min_key.offset = *off; | |
721 | ||
a4689d2b | 722 | max_key.objectid = ino; |
4cb5300b CM |
723 | max_key.type = (u8)-1; |
724 | max_key.offset = (u64)-1; | |
725 | ||
726 | path->keep_locks = 1; | |
727 | ||
728 | while(1) { | |
729 | ret = btrfs_search_forward(root, &min_key, &max_key, | |
730 | path, 0, newer_than); | |
731 | if (ret != 0) | |
732 | goto none; | |
a4689d2b | 733 | if (min_key.objectid != ino) |
4cb5300b CM |
734 | goto none; |
735 | if (min_key.type != BTRFS_EXTENT_DATA_KEY) | |
736 | goto none; | |
737 | ||
738 | leaf = path->nodes[0]; | |
739 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
740 | struct btrfs_file_extent_item); | |
741 | ||
742 | type = btrfs_file_extent_type(leaf, extent); | |
743 | if (type == BTRFS_FILE_EXTENT_REG && | |
744 | btrfs_file_extent_num_bytes(leaf, extent) < thresh && | |
745 | check_defrag_in_cache(inode, min_key.offset, thresh)) { | |
746 | *off = min_key.offset; | |
747 | btrfs_free_path(path); | |
748 | return 0; | |
749 | } | |
750 | ||
751 | if (min_key.offset == (u64)-1) | |
752 | goto none; | |
753 | ||
754 | min_key.offset++; | |
755 | btrfs_release_path(path); | |
756 | } | |
757 | none: | |
758 | btrfs_free_path(path); | |
759 | return -ENOENT; | |
760 | } | |
761 | ||
940100a4 | 762 | static int should_defrag_range(struct inode *inode, u64 start, u64 len, |
1e701a32 CM |
763 | int thresh, u64 *last_len, u64 *skip, |
764 | u64 *defrag_end) | |
940100a4 CM |
765 | { |
766 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
767 | struct extent_map *em = NULL; | |
768 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
769 | int ret = 1; | |
770 | ||
771 | /* | |
008873ea | 772 | * make sure that once we start defragging an extent, we keep on |
940100a4 CM |
773 | * defragging it |
774 | */ | |
775 | if (start < *defrag_end) | |
776 | return 1; | |
777 | ||
778 | *skip = 0; | |
779 | ||
780 | /* | |
781 | * hopefully we have this extent in the tree already, try without | |
782 | * the full extent lock | |
783 | */ | |
784 | read_lock(&em_tree->lock); | |
785 | em = lookup_extent_mapping(em_tree, start, len); | |
786 | read_unlock(&em_tree->lock); | |
787 | ||
788 | if (!em) { | |
789 | /* get the big lock and read metadata off disk */ | |
790 | lock_extent(io_tree, start, start + len - 1, GFP_NOFS); | |
791 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); | |
792 | unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); | |
793 | ||
6cf8bfbf | 794 | if (IS_ERR(em)) |
940100a4 CM |
795 | return 0; |
796 | } | |
797 | ||
798 | /* this will cover holes, and inline extents */ | |
799 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) | |
800 | ret = 0; | |
801 | ||
802 | /* | |
803 | * we hit a real extent, if it is big don't bother defragging it again | |
804 | */ | |
1e701a32 | 805 | if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) |
940100a4 CM |
806 | ret = 0; |
807 | ||
808 | /* | |
809 | * last_len ends up being a counter of how many bytes we've defragged. | |
810 | * every time we choose not to defrag an extent, we reset *last_len | |
811 | * so that the next tiny extent will force a defrag. | |
812 | * | |
813 | * The end result of this is that tiny extents before a single big | |
814 | * extent will force at least part of that big extent to be defragged. | |
815 | */ | |
816 | if (ret) { | |
940100a4 CM |
817 | *defrag_end = extent_map_end(em); |
818 | } else { | |
819 | *last_len = 0; | |
820 | *skip = extent_map_end(em); | |
821 | *defrag_end = 0; | |
822 | } | |
823 | ||
824 | free_extent_map(em); | |
825 | return ret; | |
826 | } | |
827 | ||
4cb5300b CM |
828 | /* |
829 | * it doesn't do much good to defrag one or two pages | |
830 | * at a time. This pulls in a nice chunk of pages | |
831 | * to COW and defrag. | |
832 | * | |
833 | * It also makes sure the delalloc code has enough | |
834 | * dirty data to avoid making new small extents as part | |
835 | * of the defrag | |
836 | * | |
837 | * It's a good idea to start RA on this range | |
838 | * before calling this. | |
839 | */ | |
840 | static int cluster_pages_for_defrag(struct inode *inode, | |
841 | struct page **pages, | |
842 | unsigned long start_index, | |
843 | int num_pages) | |
f46b5a66 | 844 | { |
4cb5300b CM |
845 | unsigned long file_end; |
846 | u64 isize = i_size_read(inode); | |
847 | u64 page_start; | |
848 | u64 page_end; | |
849 | int ret; | |
850 | int i; | |
851 | int i_done; | |
3eaa2885 | 852 | struct btrfs_ordered_extent *ordered; |
4cb5300b | 853 | struct extent_state *cached_state = NULL; |
3b16a4e3 | 854 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
4cb5300b CM |
855 | |
856 | if (isize == 0) | |
857 | return 0; | |
858 | file_end = (isize - 1) >> PAGE_CACHE_SHIFT; | |
859 | ||
860 | ret = btrfs_delalloc_reserve_space(inode, | |
861 | num_pages << PAGE_CACHE_SHIFT); | |
862 | if (ret) | |
863 | return ret; | |
864 | again: | |
865 | ret = 0; | |
866 | i_done = 0; | |
867 | ||
868 | /* step one, lock all the pages */ | |
869 | for (i = 0; i < num_pages; i++) { | |
870 | struct page *page; | |
a94733d0 | 871 | page = find_or_create_page(inode->i_mapping, |
3b16a4e3 | 872 | start_index + i, mask); |
4cb5300b CM |
873 | if (!page) |
874 | break; | |
875 | ||
876 | if (!PageUptodate(page)) { | |
877 | btrfs_readpage(NULL, page); | |
878 | lock_page(page); | |
879 | if (!PageUptodate(page)) { | |
880 | unlock_page(page); | |
881 | page_cache_release(page); | |
882 | ret = -EIO; | |
883 | break; | |
884 | } | |
885 | } | |
886 | isize = i_size_read(inode); | |
887 | file_end = (isize - 1) >> PAGE_CACHE_SHIFT; | |
888 | if (!isize || page->index > file_end || | |
889 | page->mapping != inode->i_mapping) { | |
890 | /* whoops, we blew past eof, skip this page */ | |
891 | unlock_page(page); | |
892 | page_cache_release(page); | |
893 | break; | |
894 | } | |
895 | pages[i] = page; | |
896 | i_done++; | |
897 | } | |
898 | if (!i_done || ret) | |
899 | goto out; | |
900 | ||
901 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
902 | goto out; | |
903 | ||
904 | /* | |
905 | * so now we have a nice long stream of locked | |
906 | * and up to date pages, lets wait on them | |
907 | */ | |
908 | for (i = 0; i < i_done; i++) | |
909 | wait_on_page_writeback(pages[i]); | |
910 | ||
911 | page_start = page_offset(pages[0]); | |
912 | page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; | |
913 | ||
914 | lock_extent_bits(&BTRFS_I(inode)->io_tree, | |
915 | page_start, page_end - 1, 0, &cached_state, | |
916 | GFP_NOFS); | |
917 | ordered = btrfs_lookup_first_ordered_extent(inode, page_end - 1); | |
918 | if (ordered && | |
919 | ordered->file_offset + ordered->len > page_start && | |
920 | ordered->file_offset < page_end) { | |
921 | btrfs_put_ordered_extent(ordered); | |
922 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, | |
923 | page_start, page_end - 1, | |
924 | &cached_state, GFP_NOFS); | |
925 | for (i = 0; i < i_done; i++) { | |
926 | unlock_page(pages[i]); | |
927 | page_cache_release(pages[i]); | |
928 | } | |
929 | btrfs_wait_ordered_range(inode, page_start, | |
930 | page_end - page_start); | |
931 | goto again; | |
932 | } | |
933 | if (ordered) | |
934 | btrfs_put_ordered_extent(ordered); | |
935 | ||
936 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, | |
937 | page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | | |
938 | EXTENT_DO_ACCOUNTING, 0, 0, &cached_state, | |
939 | GFP_NOFS); | |
940 | ||
941 | if (i_done != num_pages) { | |
9e0baf60 JB |
942 | spin_lock(&BTRFS_I(inode)->lock); |
943 | BTRFS_I(inode)->outstanding_extents++; | |
944 | spin_unlock(&BTRFS_I(inode)->lock); | |
4cb5300b CM |
945 | btrfs_delalloc_release_space(inode, |
946 | (num_pages - i_done) << PAGE_CACHE_SHIFT); | |
947 | } | |
948 | ||
949 | ||
950 | btrfs_set_extent_delalloc(inode, page_start, page_end - 1, | |
951 | &cached_state); | |
952 | ||
953 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, | |
954 | page_start, page_end - 1, &cached_state, | |
955 | GFP_NOFS); | |
956 | ||
957 | for (i = 0; i < i_done; i++) { | |
958 | clear_page_dirty_for_io(pages[i]); | |
959 | ClearPageChecked(pages[i]); | |
960 | set_page_extent_mapped(pages[i]); | |
961 | set_page_dirty(pages[i]); | |
962 | unlock_page(pages[i]); | |
963 | page_cache_release(pages[i]); | |
964 | } | |
965 | return i_done; | |
966 | out: | |
967 | for (i = 0; i < i_done; i++) { | |
968 | unlock_page(pages[i]); | |
969 | page_cache_release(pages[i]); | |
970 | } | |
971 | btrfs_delalloc_release_space(inode, num_pages << PAGE_CACHE_SHIFT); | |
972 | return ret; | |
973 | ||
974 | } | |
975 | ||
976 | int btrfs_defrag_file(struct inode *inode, struct file *file, | |
977 | struct btrfs_ioctl_defrag_range_args *range, | |
978 | u64 newer_than, unsigned long max_to_defrag) | |
979 | { | |
980 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1a419d85 | 981 | struct btrfs_super_block *disk_super; |
4cb5300b | 982 | struct file_ra_state *ra = NULL; |
f46b5a66 | 983 | unsigned long last_index; |
151a31b2 | 984 | u64 isize = i_size_read(inode); |
1a419d85 | 985 | u64 features; |
940100a4 CM |
986 | u64 last_len = 0; |
987 | u64 skip = 0; | |
988 | u64 defrag_end = 0; | |
4cb5300b | 989 | u64 newer_off = range->start; |
f46b5a66 | 990 | unsigned long i; |
008873ea | 991 | unsigned long ra_index = 0; |
f46b5a66 | 992 | int ret; |
4cb5300b | 993 | int defrag_count = 0; |
1a419d85 | 994 | int compress_type = BTRFS_COMPRESS_ZLIB; |
4cb5300b | 995 | int extent_thresh = range->extent_thresh; |
008873ea LZ |
996 | int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; |
997 | int cluster = max_cluster; | |
4cb5300b CM |
998 | u64 new_align = ~((u64)128 * 1024 - 1); |
999 | struct page **pages = NULL; | |
1000 | ||
1001 | if (extent_thresh == 0) | |
1002 | extent_thresh = 256 * 1024; | |
1a419d85 LZ |
1003 | |
1004 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { | |
1005 | if (range->compress_type > BTRFS_COMPRESS_TYPES) | |
1006 | return -EINVAL; | |
1007 | if (range->compress_type) | |
1008 | compress_type = range->compress_type; | |
1009 | } | |
f46b5a66 | 1010 | |
151a31b2 | 1011 | if (isize == 0) |
940100a4 CM |
1012 | return 0; |
1013 | ||
4cb5300b CM |
1014 | /* |
1015 | * if we were not given a file, allocate a readahead | |
1016 | * context | |
1017 | */ | |
1018 | if (!file) { | |
1019 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
1020 | if (!ra) | |
1021 | return -ENOMEM; | |
1022 | file_ra_state_init(ra, inode->i_mapping); | |
1023 | } else { | |
1024 | ra = &file->f_ra; | |
1025 | } | |
1026 | ||
008873ea | 1027 | pages = kmalloc(sizeof(struct page *) * max_cluster, |
4cb5300b CM |
1028 | GFP_NOFS); |
1029 | if (!pages) { | |
1030 | ret = -ENOMEM; | |
1031 | goto out_ra; | |
1032 | } | |
1033 | ||
1034 | /* find the last page to defrag */ | |
1e701a32 | 1035 | if (range->start + range->len > range->start) { |
151a31b2 | 1036 | last_index = min_t(u64, isize - 1, |
1e701a32 CM |
1037 | range->start + range->len - 1) >> PAGE_CACHE_SHIFT; |
1038 | } else { | |
151a31b2 | 1039 | last_index = (isize - 1) >> PAGE_CACHE_SHIFT; |
1e701a32 CM |
1040 | } |
1041 | ||
4cb5300b CM |
1042 | if (newer_than) { |
1043 | ret = find_new_extents(root, inode, newer_than, | |
1044 | &newer_off, 64 * 1024); | |
1045 | if (!ret) { | |
1046 | range->start = newer_off; | |
1047 | /* | |
1048 | * we always align our defrag to help keep | |
1049 | * the extents in the file evenly spaced | |
1050 | */ | |
1051 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; | |
4cb5300b CM |
1052 | } else |
1053 | goto out_ra; | |
1054 | } else { | |
1055 | i = range->start >> PAGE_CACHE_SHIFT; | |
1056 | } | |
1057 | if (!max_to_defrag) | |
5ca49660 | 1058 | max_to_defrag = last_index; |
4cb5300b | 1059 | |
2a0f7f57 LZ |
1060 | /* |
1061 | * make writeback starts from i, so the defrag range can be | |
1062 | * written sequentially. | |
1063 | */ | |
1064 | if (i < inode->i_mapping->writeback_index) | |
1065 | inode->i_mapping->writeback_index = i; | |
1066 | ||
f7f43cc8 CM |
1067 | while (i <= last_index && defrag_count < max_to_defrag && |
1068 | (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> | |
1069 | PAGE_CACHE_SHIFT)) { | |
4cb5300b CM |
1070 | /* |
1071 | * make sure we stop running if someone unmounts | |
1072 | * the FS | |
1073 | */ | |
1074 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
1075 | break; | |
1076 | ||
1077 | if (!newer_than && | |
1078 | !should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, | |
1e701a32 | 1079 | PAGE_CACHE_SIZE, |
4cb5300b | 1080 | extent_thresh, |
1e701a32 | 1081 | &last_len, &skip, |
940100a4 CM |
1082 | &defrag_end)) { |
1083 | unsigned long next; | |
1084 | /* | |
1085 | * the should_defrag function tells us how much to skip | |
1086 | * bump our counter by the suggested amount | |
1087 | */ | |
1088 | next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
1089 | i = max(i + 1, next); | |
1090 | continue; | |
1091 | } | |
008873ea LZ |
1092 | |
1093 | if (!newer_than) { | |
1094 | cluster = (PAGE_CACHE_ALIGN(defrag_end) >> | |
1095 | PAGE_CACHE_SHIFT) - i; | |
1096 | cluster = min(cluster, max_cluster); | |
1097 | } else { | |
1098 | cluster = max_cluster; | |
1099 | } | |
1100 | ||
1e701a32 | 1101 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) |
1a419d85 | 1102 | BTRFS_I(inode)->force_compress = compress_type; |
940100a4 | 1103 | |
008873ea LZ |
1104 | if (i + cluster > ra_index) { |
1105 | ra_index = max(i, ra_index); | |
1106 | btrfs_force_ra(inode->i_mapping, ra, file, ra_index, | |
1107 | cluster); | |
1108 | ra_index += max_cluster; | |
1109 | } | |
940100a4 | 1110 | |
008873ea | 1111 | ret = cluster_pages_for_defrag(inode, pages, i, cluster); |
4cb5300b CM |
1112 | if (ret < 0) |
1113 | goto out_ra; | |
1114 | ||
1115 | defrag_count += ret; | |
1116 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, ret); | |
4cb5300b CM |
1117 | |
1118 | if (newer_than) { | |
1119 | if (newer_off == (u64)-1) | |
1120 | break; | |
1121 | ||
1122 | newer_off = max(newer_off + 1, | |
1123 | (u64)i << PAGE_CACHE_SHIFT); | |
1124 | ||
1125 | ret = find_new_extents(root, inode, | |
1126 | newer_than, &newer_off, | |
1127 | 64 * 1024); | |
1128 | if (!ret) { | |
1129 | range->start = newer_off; | |
1130 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; | |
4cb5300b CM |
1131 | } else { |
1132 | break; | |
f46b5a66 | 1133 | } |
4cb5300b | 1134 | } else { |
008873ea | 1135 | if (ret > 0) { |
cbcc8326 | 1136 | i += ret; |
008873ea LZ |
1137 | last_len += ret << PAGE_CACHE_SHIFT; |
1138 | } else { | |
cbcc8326 | 1139 | i++; |
008873ea LZ |
1140 | last_len = 0; |
1141 | } | |
f46b5a66 | 1142 | } |
f46b5a66 CH |
1143 | } |
1144 | ||
1e701a32 CM |
1145 | if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) |
1146 | filemap_flush(inode->i_mapping); | |
1147 | ||
1148 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
1149 | /* the filemap_flush will queue IO into the worker threads, but | |
1150 | * we have to make sure the IO is actually started and that | |
1151 | * ordered extents get created before we return | |
1152 | */ | |
1153 | atomic_inc(&root->fs_info->async_submit_draining); | |
1154 | while (atomic_read(&root->fs_info->nr_async_submits) || | |
1155 | atomic_read(&root->fs_info->async_delalloc_pages)) { | |
1156 | wait_event(root->fs_info->async_submit_wait, | |
1157 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && | |
1158 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); | |
1159 | } | |
1160 | atomic_dec(&root->fs_info->async_submit_draining); | |
1161 | ||
1162 | mutex_lock(&inode->i_mutex); | |
261507a0 | 1163 | BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; |
1e701a32 CM |
1164 | mutex_unlock(&inode->i_mutex); |
1165 | } | |
1166 | ||
6c41761f | 1167 | disk_super = root->fs_info->super_copy; |
1a419d85 LZ |
1168 | features = btrfs_super_incompat_flags(disk_super); |
1169 | if (range->compress_type == BTRFS_COMPRESS_LZO) { | |
1170 | features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; | |
1171 | btrfs_set_super_incompat_flags(disk_super, features); | |
1172 | } | |
1173 | ||
60ccf82f | 1174 | ret = defrag_count; |
940100a4 | 1175 | |
4cb5300b CM |
1176 | out_ra: |
1177 | if (!file) | |
1178 | kfree(ra); | |
1179 | kfree(pages); | |
940100a4 | 1180 | return ret; |
f46b5a66 CH |
1181 | } |
1182 | ||
76dda93c YZ |
1183 | static noinline int btrfs_ioctl_resize(struct btrfs_root *root, |
1184 | void __user *arg) | |
f46b5a66 CH |
1185 | { |
1186 | u64 new_size; | |
1187 | u64 old_size; | |
1188 | u64 devid = 1; | |
1189 | struct btrfs_ioctl_vol_args *vol_args; | |
1190 | struct btrfs_trans_handle *trans; | |
1191 | struct btrfs_device *device = NULL; | |
1192 | char *sizestr; | |
1193 | char *devstr = NULL; | |
1194 | int ret = 0; | |
f46b5a66 CH |
1195 | int mod = 0; |
1196 | ||
c146afad YZ |
1197 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
1198 | return -EROFS; | |
1199 | ||
e441d54d CM |
1200 | if (!capable(CAP_SYS_ADMIN)) |
1201 | return -EPERM; | |
1202 | ||
dae7b665 LZ |
1203 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1204 | if (IS_ERR(vol_args)) | |
1205 | return PTR_ERR(vol_args); | |
5516e595 MF |
1206 | |
1207 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 1208 | |
7d9eb12c | 1209 | mutex_lock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
1210 | sizestr = vol_args->name; |
1211 | devstr = strchr(sizestr, ':'); | |
1212 | if (devstr) { | |
1213 | char *end; | |
1214 | sizestr = devstr + 1; | |
1215 | *devstr = '\0'; | |
1216 | devstr = vol_args->name; | |
1217 | devid = simple_strtoull(devstr, &end, 10); | |
21380931 JB |
1218 | printk(KERN_INFO "resizing devid %llu\n", |
1219 | (unsigned long long)devid); | |
f46b5a66 | 1220 | } |
2b82032c | 1221 | device = btrfs_find_device(root, devid, NULL, NULL); |
f46b5a66 | 1222 | if (!device) { |
21380931 JB |
1223 | printk(KERN_INFO "resizer unable to find device %llu\n", |
1224 | (unsigned long long)devid); | |
f46b5a66 CH |
1225 | ret = -EINVAL; |
1226 | goto out_unlock; | |
1227 | } | |
1228 | if (!strcmp(sizestr, "max")) | |
1229 | new_size = device->bdev->bd_inode->i_size; | |
1230 | else { | |
1231 | if (sizestr[0] == '-') { | |
1232 | mod = -1; | |
1233 | sizestr++; | |
1234 | } else if (sizestr[0] == '+') { | |
1235 | mod = 1; | |
1236 | sizestr++; | |
1237 | } | |
91748467 | 1238 | new_size = memparse(sizestr, NULL); |
f46b5a66 CH |
1239 | if (new_size == 0) { |
1240 | ret = -EINVAL; | |
1241 | goto out_unlock; | |
1242 | } | |
1243 | } | |
1244 | ||
1245 | old_size = device->total_bytes; | |
1246 | ||
1247 | if (mod < 0) { | |
1248 | if (new_size > old_size) { | |
1249 | ret = -EINVAL; | |
1250 | goto out_unlock; | |
1251 | } | |
1252 | new_size = old_size - new_size; | |
1253 | } else if (mod > 0) { | |
1254 | new_size = old_size + new_size; | |
1255 | } | |
1256 | ||
1257 | if (new_size < 256 * 1024 * 1024) { | |
1258 | ret = -EINVAL; | |
1259 | goto out_unlock; | |
1260 | } | |
1261 | if (new_size > device->bdev->bd_inode->i_size) { | |
1262 | ret = -EFBIG; | |
1263 | goto out_unlock; | |
1264 | } | |
1265 | ||
1266 | do_div(new_size, root->sectorsize); | |
1267 | new_size *= root->sectorsize; | |
1268 | ||
1269 | printk(KERN_INFO "new size for %s is %llu\n", | |
1270 | device->name, (unsigned long long)new_size); | |
1271 | ||
1272 | if (new_size > old_size) { | |
a22285a6 | 1273 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1274 | if (IS_ERR(trans)) { |
1275 | ret = PTR_ERR(trans); | |
1276 | goto out_unlock; | |
1277 | } | |
f46b5a66 CH |
1278 | ret = btrfs_grow_device(trans, device, new_size); |
1279 | btrfs_commit_transaction(trans, root); | |
1280 | } else { | |
1281 | ret = btrfs_shrink_device(device, new_size); | |
1282 | } | |
1283 | ||
1284 | out_unlock: | |
7d9eb12c | 1285 | mutex_unlock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
1286 | kfree(vol_args); |
1287 | return ret; | |
1288 | } | |
1289 | ||
72fd032e SW |
1290 | static noinline int btrfs_ioctl_snap_create_transid(struct file *file, |
1291 | char *name, | |
1292 | unsigned long fd, | |
1293 | int subvol, | |
b83cc969 LZ |
1294 | u64 *transid, |
1295 | bool readonly) | |
f46b5a66 | 1296 | { |
cb8e7090 | 1297 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
3de4586c | 1298 | struct file *src_file; |
f46b5a66 | 1299 | int namelen; |
3de4586c | 1300 | int ret = 0; |
f46b5a66 | 1301 | |
c146afad YZ |
1302 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
1303 | return -EROFS; | |
1304 | ||
72fd032e SW |
1305 | namelen = strlen(name); |
1306 | if (strchr(name, '/')) { | |
f46b5a66 CH |
1307 | ret = -EINVAL; |
1308 | goto out; | |
1309 | } | |
1310 | ||
3de4586c | 1311 | if (subvol) { |
72fd032e | 1312 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
b83cc969 | 1313 | NULL, transid, readonly); |
cb8e7090 | 1314 | } else { |
3de4586c | 1315 | struct inode *src_inode; |
72fd032e | 1316 | src_file = fget(fd); |
3de4586c CM |
1317 | if (!src_file) { |
1318 | ret = -EINVAL; | |
1319 | goto out; | |
1320 | } | |
1321 | ||
1322 | src_inode = src_file->f_path.dentry->d_inode; | |
1323 | if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { | |
d397712b CM |
1324 | printk(KERN_INFO "btrfs: Snapshot src from " |
1325 | "another FS\n"); | |
3de4586c CM |
1326 | ret = -EINVAL; |
1327 | fput(src_file); | |
1328 | goto out; | |
1329 | } | |
72fd032e SW |
1330 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
1331 | BTRFS_I(src_inode)->root, | |
b83cc969 | 1332 | transid, readonly); |
3de4586c | 1333 | fput(src_file); |
cb8e7090 | 1334 | } |
f46b5a66 | 1335 | out: |
72fd032e SW |
1336 | return ret; |
1337 | } | |
1338 | ||
1339 | static noinline int btrfs_ioctl_snap_create(struct file *file, | |
fa0d2b9b | 1340 | void __user *arg, int subvol) |
72fd032e | 1341 | { |
fa0d2b9b | 1342 | struct btrfs_ioctl_vol_args *vol_args; |
72fd032e SW |
1343 | int ret; |
1344 | ||
fa0d2b9b LZ |
1345 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1346 | if (IS_ERR(vol_args)) | |
1347 | return PTR_ERR(vol_args); | |
1348 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
72fd032e | 1349 | |
fa0d2b9b | 1350 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, |
b83cc969 LZ |
1351 | vol_args->fd, subvol, |
1352 | NULL, false); | |
fdfb1e4f | 1353 | |
fa0d2b9b LZ |
1354 | kfree(vol_args); |
1355 | return ret; | |
1356 | } | |
fdfb1e4f | 1357 | |
fa0d2b9b LZ |
1358 | static noinline int btrfs_ioctl_snap_create_v2(struct file *file, |
1359 | void __user *arg, int subvol) | |
1360 | { | |
1361 | struct btrfs_ioctl_vol_args_v2 *vol_args; | |
1362 | int ret; | |
1363 | u64 transid = 0; | |
1364 | u64 *ptr = NULL; | |
b83cc969 | 1365 | bool readonly = false; |
75eaa0e2 | 1366 | |
fa0d2b9b LZ |
1367 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1368 | if (IS_ERR(vol_args)) | |
1369 | return PTR_ERR(vol_args); | |
1370 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; | |
75eaa0e2 | 1371 | |
b83cc969 LZ |
1372 | if (vol_args->flags & |
1373 | ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY)) { | |
1374 | ret = -EOPNOTSUPP; | |
fa0d2b9b | 1375 | goto out; |
72fd032e | 1376 | } |
fa0d2b9b LZ |
1377 | |
1378 | if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) | |
1379 | ptr = &transid; | |
b83cc969 LZ |
1380 | if (vol_args->flags & BTRFS_SUBVOL_RDONLY) |
1381 | readonly = true; | |
fa0d2b9b LZ |
1382 | |
1383 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, | |
b83cc969 LZ |
1384 | vol_args->fd, subvol, |
1385 | ptr, readonly); | |
fa0d2b9b LZ |
1386 | |
1387 | if (ret == 0 && ptr && | |
1388 | copy_to_user(arg + | |
1389 | offsetof(struct btrfs_ioctl_vol_args_v2, | |
1390 | transid), ptr, sizeof(*ptr))) | |
1391 | ret = -EFAULT; | |
fdfb1e4f | 1392 | out: |
f46b5a66 CH |
1393 | kfree(vol_args); |
1394 | return ret; | |
1395 | } | |
1396 | ||
0caa102d LZ |
1397 | static noinline int btrfs_ioctl_subvol_getflags(struct file *file, |
1398 | void __user *arg) | |
1399 | { | |
1400 | struct inode *inode = fdentry(file)->d_inode; | |
1401 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1402 | int ret = 0; | |
1403 | u64 flags = 0; | |
1404 | ||
33345d01 | 1405 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) |
0caa102d LZ |
1406 | return -EINVAL; |
1407 | ||
1408 | down_read(&root->fs_info->subvol_sem); | |
1409 | if (btrfs_root_readonly(root)) | |
1410 | flags |= BTRFS_SUBVOL_RDONLY; | |
1411 | up_read(&root->fs_info->subvol_sem); | |
1412 | ||
1413 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
1414 | ret = -EFAULT; | |
1415 | ||
1416 | return ret; | |
1417 | } | |
1418 | ||
1419 | static noinline int btrfs_ioctl_subvol_setflags(struct file *file, | |
1420 | void __user *arg) | |
1421 | { | |
1422 | struct inode *inode = fdentry(file)->d_inode; | |
1423 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1424 | struct btrfs_trans_handle *trans; | |
1425 | u64 root_flags; | |
1426 | u64 flags; | |
1427 | int ret = 0; | |
1428 | ||
1429 | if (root->fs_info->sb->s_flags & MS_RDONLY) | |
1430 | return -EROFS; | |
1431 | ||
33345d01 | 1432 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) |
0caa102d LZ |
1433 | return -EINVAL; |
1434 | ||
1435 | if (copy_from_user(&flags, arg, sizeof(flags))) | |
1436 | return -EFAULT; | |
1437 | ||
b4dc2b8c | 1438 | if (flags & BTRFS_SUBVOL_CREATE_ASYNC) |
0caa102d LZ |
1439 | return -EINVAL; |
1440 | ||
1441 | if (flags & ~BTRFS_SUBVOL_RDONLY) | |
1442 | return -EOPNOTSUPP; | |
1443 | ||
2e149670 | 1444 | if (!inode_owner_or_capable(inode)) |
b4dc2b8c LZ |
1445 | return -EACCES; |
1446 | ||
0caa102d LZ |
1447 | down_write(&root->fs_info->subvol_sem); |
1448 | ||
1449 | /* nothing to do */ | |
1450 | if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) | |
1451 | goto out; | |
1452 | ||
1453 | root_flags = btrfs_root_flags(&root->root_item); | |
1454 | if (flags & BTRFS_SUBVOL_RDONLY) | |
1455 | btrfs_set_root_flags(&root->root_item, | |
1456 | root_flags | BTRFS_ROOT_SUBVOL_RDONLY); | |
1457 | else | |
1458 | btrfs_set_root_flags(&root->root_item, | |
1459 | root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); | |
1460 | ||
1461 | trans = btrfs_start_transaction(root, 1); | |
1462 | if (IS_ERR(trans)) { | |
1463 | ret = PTR_ERR(trans); | |
1464 | goto out_reset; | |
1465 | } | |
1466 | ||
b4dc2b8c | 1467 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
0caa102d LZ |
1468 | &root->root_key, &root->root_item); |
1469 | ||
1470 | btrfs_commit_transaction(trans, root); | |
1471 | out_reset: | |
1472 | if (ret) | |
1473 | btrfs_set_root_flags(&root->root_item, root_flags); | |
1474 | out: | |
1475 | up_write(&root->fs_info->subvol_sem); | |
1476 | return ret; | |
1477 | } | |
1478 | ||
76dda93c YZ |
1479 | /* |
1480 | * helper to check if the subvolume references other subvolumes | |
1481 | */ | |
1482 | static noinline int may_destroy_subvol(struct btrfs_root *root) | |
1483 | { | |
1484 | struct btrfs_path *path; | |
1485 | struct btrfs_key key; | |
1486 | int ret; | |
1487 | ||
1488 | path = btrfs_alloc_path(); | |
1489 | if (!path) | |
1490 | return -ENOMEM; | |
1491 | ||
1492 | key.objectid = root->root_key.objectid; | |
1493 | key.type = BTRFS_ROOT_REF_KEY; | |
1494 | key.offset = (u64)-1; | |
1495 | ||
1496 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, | |
1497 | &key, path, 0, 0); | |
1498 | if (ret < 0) | |
1499 | goto out; | |
1500 | BUG_ON(ret == 0); | |
1501 | ||
1502 | ret = 0; | |
1503 | if (path->slots[0] > 0) { | |
1504 | path->slots[0]--; | |
1505 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1506 | if (key.objectid == root->root_key.objectid && | |
1507 | key.type == BTRFS_ROOT_REF_KEY) | |
1508 | ret = -ENOTEMPTY; | |
1509 | } | |
1510 | out: | |
1511 | btrfs_free_path(path); | |
1512 | return ret; | |
1513 | } | |
1514 | ||
ac8e9819 CM |
1515 | static noinline int key_in_sk(struct btrfs_key *key, |
1516 | struct btrfs_ioctl_search_key *sk) | |
1517 | { | |
abc6e134 CM |
1518 | struct btrfs_key test; |
1519 | int ret; | |
1520 | ||
1521 | test.objectid = sk->min_objectid; | |
1522 | test.type = sk->min_type; | |
1523 | test.offset = sk->min_offset; | |
1524 | ||
1525 | ret = btrfs_comp_cpu_keys(key, &test); | |
1526 | if (ret < 0) | |
ac8e9819 | 1527 | return 0; |
abc6e134 CM |
1528 | |
1529 | test.objectid = sk->max_objectid; | |
1530 | test.type = sk->max_type; | |
1531 | test.offset = sk->max_offset; | |
1532 | ||
1533 | ret = btrfs_comp_cpu_keys(key, &test); | |
1534 | if (ret > 0) | |
ac8e9819 CM |
1535 | return 0; |
1536 | return 1; | |
1537 | } | |
1538 | ||
1539 | static noinline int copy_to_sk(struct btrfs_root *root, | |
1540 | struct btrfs_path *path, | |
1541 | struct btrfs_key *key, | |
1542 | struct btrfs_ioctl_search_key *sk, | |
1543 | char *buf, | |
1544 | unsigned long *sk_offset, | |
1545 | int *num_found) | |
1546 | { | |
1547 | u64 found_transid; | |
1548 | struct extent_buffer *leaf; | |
1549 | struct btrfs_ioctl_search_header sh; | |
1550 | unsigned long item_off; | |
1551 | unsigned long item_len; | |
1552 | int nritems; | |
1553 | int i; | |
1554 | int slot; | |
ac8e9819 CM |
1555 | int ret = 0; |
1556 | ||
1557 | leaf = path->nodes[0]; | |
1558 | slot = path->slots[0]; | |
1559 | nritems = btrfs_header_nritems(leaf); | |
1560 | ||
1561 | if (btrfs_header_generation(leaf) > sk->max_transid) { | |
1562 | i = nritems; | |
1563 | goto advance_key; | |
1564 | } | |
1565 | found_transid = btrfs_header_generation(leaf); | |
1566 | ||
1567 | for (i = slot; i < nritems; i++) { | |
1568 | item_off = btrfs_item_ptr_offset(leaf, i); | |
1569 | item_len = btrfs_item_size_nr(leaf, i); | |
1570 | ||
1571 | if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) | |
1572 | item_len = 0; | |
1573 | ||
1574 | if (sizeof(sh) + item_len + *sk_offset > | |
1575 | BTRFS_SEARCH_ARGS_BUFSIZE) { | |
1576 | ret = 1; | |
1577 | goto overflow; | |
1578 | } | |
1579 | ||
1580 | btrfs_item_key_to_cpu(leaf, key, i); | |
1581 | if (!key_in_sk(key, sk)) | |
1582 | continue; | |
1583 | ||
1584 | sh.objectid = key->objectid; | |
1585 | sh.offset = key->offset; | |
1586 | sh.type = key->type; | |
1587 | sh.len = item_len; | |
1588 | sh.transid = found_transid; | |
1589 | ||
1590 | /* copy search result header */ | |
1591 | memcpy(buf + *sk_offset, &sh, sizeof(sh)); | |
1592 | *sk_offset += sizeof(sh); | |
1593 | ||
1594 | if (item_len) { | |
1595 | char *p = buf + *sk_offset; | |
1596 | /* copy the item */ | |
1597 | read_extent_buffer(leaf, p, | |
1598 | item_off, item_len); | |
1599 | *sk_offset += item_len; | |
ac8e9819 | 1600 | } |
e2156867 | 1601 | (*num_found)++; |
ac8e9819 CM |
1602 | |
1603 | if (*num_found >= sk->nr_items) | |
1604 | break; | |
1605 | } | |
1606 | advance_key: | |
abc6e134 CM |
1607 | ret = 0; |
1608 | if (key->offset < (u64)-1 && key->offset < sk->max_offset) | |
ac8e9819 | 1609 | key->offset++; |
abc6e134 CM |
1610 | else if (key->type < (u8)-1 && key->type < sk->max_type) { |
1611 | key->offset = 0; | |
ac8e9819 | 1612 | key->type++; |
abc6e134 CM |
1613 | } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { |
1614 | key->offset = 0; | |
1615 | key->type = 0; | |
ac8e9819 | 1616 | key->objectid++; |
abc6e134 CM |
1617 | } else |
1618 | ret = 1; | |
ac8e9819 | 1619 | overflow: |
ac8e9819 CM |
1620 | return ret; |
1621 | } | |
1622 | ||
1623 | static noinline int search_ioctl(struct inode *inode, | |
1624 | struct btrfs_ioctl_search_args *args) | |
1625 | { | |
1626 | struct btrfs_root *root; | |
1627 | struct btrfs_key key; | |
1628 | struct btrfs_key max_key; | |
1629 | struct btrfs_path *path; | |
1630 | struct btrfs_ioctl_search_key *sk = &args->key; | |
1631 | struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; | |
1632 | int ret; | |
1633 | int num_found = 0; | |
1634 | unsigned long sk_offset = 0; | |
1635 | ||
1636 | path = btrfs_alloc_path(); | |
1637 | if (!path) | |
1638 | return -ENOMEM; | |
1639 | ||
1640 | if (sk->tree_id == 0) { | |
1641 | /* search the root of the inode that was passed */ | |
1642 | root = BTRFS_I(inode)->root; | |
1643 | } else { | |
1644 | key.objectid = sk->tree_id; | |
1645 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1646 | key.offset = (u64)-1; | |
1647 | root = btrfs_read_fs_root_no_name(info, &key); | |
1648 | if (IS_ERR(root)) { | |
1649 | printk(KERN_ERR "could not find root %llu\n", | |
1650 | sk->tree_id); | |
1651 | btrfs_free_path(path); | |
1652 | return -ENOENT; | |
1653 | } | |
1654 | } | |
1655 | ||
1656 | key.objectid = sk->min_objectid; | |
1657 | key.type = sk->min_type; | |
1658 | key.offset = sk->min_offset; | |
1659 | ||
1660 | max_key.objectid = sk->max_objectid; | |
1661 | max_key.type = sk->max_type; | |
1662 | max_key.offset = sk->max_offset; | |
1663 | ||
1664 | path->keep_locks = 1; | |
1665 | ||
1666 | while(1) { | |
1667 | ret = btrfs_search_forward(root, &key, &max_key, path, 0, | |
1668 | sk->min_transid); | |
1669 | if (ret != 0) { | |
1670 | if (ret > 0) | |
1671 | ret = 0; | |
1672 | goto err; | |
1673 | } | |
1674 | ret = copy_to_sk(root, path, &key, sk, args->buf, | |
1675 | &sk_offset, &num_found); | |
b3b4aa74 | 1676 | btrfs_release_path(path); |
ac8e9819 CM |
1677 | if (ret || num_found >= sk->nr_items) |
1678 | break; | |
1679 | ||
1680 | } | |
1681 | ret = 0; | |
1682 | err: | |
1683 | sk->nr_items = num_found; | |
1684 | btrfs_free_path(path); | |
1685 | return ret; | |
1686 | } | |
1687 | ||
1688 | static noinline int btrfs_ioctl_tree_search(struct file *file, | |
1689 | void __user *argp) | |
1690 | { | |
1691 | struct btrfs_ioctl_search_args *args; | |
1692 | struct inode *inode; | |
1693 | int ret; | |
1694 | ||
1695 | if (!capable(CAP_SYS_ADMIN)) | |
1696 | return -EPERM; | |
1697 | ||
2354d08f JL |
1698 | args = memdup_user(argp, sizeof(*args)); |
1699 | if (IS_ERR(args)) | |
1700 | return PTR_ERR(args); | |
ac8e9819 | 1701 | |
ac8e9819 CM |
1702 | inode = fdentry(file)->d_inode; |
1703 | ret = search_ioctl(inode, args); | |
1704 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
1705 | ret = -EFAULT; | |
1706 | kfree(args); | |
1707 | return ret; | |
1708 | } | |
1709 | ||
98d377a0 | 1710 | /* |
ac8e9819 CM |
1711 | * Search INODE_REFs to identify path name of 'dirid' directory |
1712 | * in a 'tree_id' tree. and sets path name to 'name'. | |
1713 | */ | |
98d377a0 TH |
1714 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
1715 | u64 tree_id, u64 dirid, char *name) | |
1716 | { | |
1717 | struct btrfs_root *root; | |
1718 | struct btrfs_key key; | |
ac8e9819 | 1719 | char *ptr; |
98d377a0 TH |
1720 | int ret = -1; |
1721 | int slot; | |
1722 | int len; | |
1723 | int total_len = 0; | |
1724 | struct btrfs_inode_ref *iref; | |
1725 | struct extent_buffer *l; | |
1726 | struct btrfs_path *path; | |
1727 | ||
1728 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { | |
1729 | name[0]='\0'; | |
1730 | return 0; | |
1731 | } | |
1732 | ||
1733 | path = btrfs_alloc_path(); | |
1734 | if (!path) | |
1735 | return -ENOMEM; | |
1736 | ||
ac8e9819 | 1737 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; |
98d377a0 TH |
1738 | |
1739 | key.objectid = tree_id; | |
1740 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1741 | key.offset = (u64)-1; | |
1742 | root = btrfs_read_fs_root_no_name(info, &key); | |
1743 | if (IS_ERR(root)) { | |
1744 | printk(KERN_ERR "could not find root %llu\n", tree_id); | |
8ad6fcab CM |
1745 | ret = -ENOENT; |
1746 | goto out; | |
98d377a0 TH |
1747 | } |
1748 | ||
1749 | key.objectid = dirid; | |
1750 | key.type = BTRFS_INODE_REF_KEY; | |
8ad6fcab | 1751 | key.offset = (u64)-1; |
98d377a0 TH |
1752 | |
1753 | while(1) { | |
1754 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1755 | if (ret < 0) | |
1756 | goto out; | |
1757 | ||
1758 | l = path->nodes[0]; | |
1759 | slot = path->slots[0]; | |
8ad6fcab CM |
1760 | if (ret > 0 && slot > 0) |
1761 | slot--; | |
98d377a0 TH |
1762 | btrfs_item_key_to_cpu(l, &key, slot); |
1763 | ||
1764 | if (ret > 0 && (key.objectid != dirid || | |
ac8e9819 CM |
1765 | key.type != BTRFS_INODE_REF_KEY)) { |
1766 | ret = -ENOENT; | |
98d377a0 | 1767 | goto out; |
ac8e9819 | 1768 | } |
98d377a0 TH |
1769 | |
1770 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); | |
1771 | len = btrfs_inode_ref_name_len(l, iref); | |
1772 | ptr -= len + 1; | |
1773 | total_len += len + 1; | |
ac8e9819 | 1774 | if (ptr < name) |
98d377a0 TH |
1775 | goto out; |
1776 | ||
1777 | *(ptr + len) = '/'; | |
1778 | read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); | |
1779 | ||
1780 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) | |
1781 | break; | |
1782 | ||
b3b4aa74 | 1783 | btrfs_release_path(path); |
98d377a0 | 1784 | key.objectid = key.offset; |
8ad6fcab | 1785 | key.offset = (u64)-1; |
98d377a0 | 1786 | dirid = key.objectid; |
98d377a0 | 1787 | } |
ac8e9819 | 1788 | if (ptr < name) |
98d377a0 | 1789 | goto out; |
77906a50 | 1790 | memmove(name, ptr, total_len); |
98d377a0 TH |
1791 | name[total_len]='\0'; |
1792 | ret = 0; | |
1793 | out: | |
1794 | btrfs_free_path(path); | |
ac8e9819 CM |
1795 | return ret; |
1796 | } | |
1797 | ||
1798 | static noinline int btrfs_ioctl_ino_lookup(struct file *file, | |
1799 | void __user *argp) | |
1800 | { | |
1801 | struct btrfs_ioctl_ino_lookup_args *args; | |
1802 | struct inode *inode; | |
1803 | int ret; | |
1804 | ||
1805 | if (!capable(CAP_SYS_ADMIN)) | |
1806 | return -EPERM; | |
1807 | ||
2354d08f JL |
1808 | args = memdup_user(argp, sizeof(*args)); |
1809 | if (IS_ERR(args)) | |
1810 | return PTR_ERR(args); | |
c2b96929 | 1811 | |
ac8e9819 CM |
1812 | inode = fdentry(file)->d_inode; |
1813 | ||
1b53ac4d CM |
1814 | if (args->treeid == 0) |
1815 | args->treeid = BTRFS_I(inode)->root->root_key.objectid; | |
1816 | ||
ac8e9819 CM |
1817 | ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, |
1818 | args->treeid, args->objectid, | |
1819 | args->name); | |
1820 | ||
1821 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
1822 | ret = -EFAULT; | |
1823 | ||
1824 | kfree(args); | |
98d377a0 TH |
1825 | return ret; |
1826 | } | |
1827 | ||
76dda93c YZ |
1828 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
1829 | void __user *arg) | |
1830 | { | |
1831 | struct dentry *parent = fdentry(file); | |
1832 | struct dentry *dentry; | |
1833 | struct inode *dir = parent->d_inode; | |
1834 | struct inode *inode; | |
1835 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1836 | struct btrfs_root *dest = NULL; | |
1837 | struct btrfs_ioctl_vol_args *vol_args; | |
1838 | struct btrfs_trans_handle *trans; | |
1839 | int namelen; | |
1840 | int ret; | |
1841 | int err = 0; | |
1842 | ||
76dda93c YZ |
1843 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1844 | if (IS_ERR(vol_args)) | |
1845 | return PTR_ERR(vol_args); | |
1846 | ||
1847 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
1848 | namelen = strlen(vol_args->name); | |
1849 | if (strchr(vol_args->name, '/') || | |
1850 | strncmp(vol_args->name, "..", namelen) == 0) { | |
1851 | err = -EINVAL; | |
1852 | goto out; | |
1853 | } | |
1854 | ||
1855 | err = mnt_want_write(file->f_path.mnt); | |
1856 | if (err) | |
1857 | goto out; | |
1858 | ||
1859 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
1860 | dentry = lookup_one_len(vol_args->name, parent, namelen); | |
1861 | if (IS_ERR(dentry)) { | |
1862 | err = PTR_ERR(dentry); | |
1863 | goto out_unlock_dir; | |
1864 | } | |
1865 | ||
1866 | if (!dentry->d_inode) { | |
1867 | err = -ENOENT; | |
1868 | goto out_dput; | |
1869 | } | |
1870 | ||
1871 | inode = dentry->d_inode; | |
4260f7c7 SW |
1872 | dest = BTRFS_I(inode)->root; |
1873 | if (!capable(CAP_SYS_ADMIN)){ | |
1874 | /* | |
1875 | * Regular user. Only allow this with a special mount | |
1876 | * option, when the user has write+exec access to the | |
1877 | * subvol root, and when rmdir(2) would have been | |
1878 | * allowed. | |
1879 | * | |
1880 | * Note that this is _not_ check that the subvol is | |
1881 | * empty or doesn't contain data that we wouldn't | |
1882 | * otherwise be able to delete. | |
1883 | * | |
1884 | * Users who want to delete empty subvols should try | |
1885 | * rmdir(2). | |
1886 | */ | |
1887 | err = -EPERM; | |
1888 | if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
1889 | goto out_dput; | |
1890 | ||
1891 | /* | |
1892 | * Do not allow deletion if the parent dir is the same | |
1893 | * as the dir to be deleted. That means the ioctl | |
1894 | * must be called on the dentry referencing the root | |
1895 | * of the subvol, not a random directory contained | |
1896 | * within it. | |
1897 | */ | |
1898 | err = -EINVAL; | |
1899 | if (root == dest) | |
1900 | goto out_dput; | |
1901 | ||
1902 | err = inode_permission(inode, MAY_WRITE | MAY_EXEC); | |
1903 | if (err) | |
1904 | goto out_dput; | |
1905 | ||
1906 | /* check if subvolume may be deleted by a non-root user */ | |
1907 | err = btrfs_may_delete(dir, dentry, 1); | |
1908 | if (err) | |
1909 | goto out_dput; | |
1910 | } | |
1911 | ||
33345d01 | 1912 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
76dda93c YZ |
1913 | err = -EINVAL; |
1914 | goto out_dput; | |
1915 | } | |
1916 | ||
76dda93c YZ |
1917 | mutex_lock(&inode->i_mutex); |
1918 | err = d_invalidate(dentry); | |
1919 | if (err) | |
1920 | goto out_unlock; | |
1921 | ||
1922 | down_write(&root->fs_info->subvol_sem); | |
1923 | ||
1924 | err = may_destroy_subvol(dest); | |
1925 | if (err) | |
1926 | goto out_up_write; | |
1927 | ||
a22285a6 YZ |
1928 | trans = btrfs_start_transaction(root, 0); |
1929 | if (IS_ERR(trans)) { | |
1930 | err = PTR_ERR(trans); | |
d327099a | 1931 | goto out_up_write; |
a22285a6 YZ |
1932 | } |
1933 | trans->block_rsv = &root->fs_info->global_block_rsv; | |
1934 | ||
76dda93c YZ |
1935 | ret = btrfs_unlink_subvol(trans, root, dir, |
1936 | dest->root_key.objectid, | |
1937 | dentry->d_name.name, | |
1938 | dentry->d_name.len); | |
1939 | BUG_ON(ret); | |
1940 | ||
1941 | btrfs_record_root_in_trans(trans, dest); | |
1942 | ||
1943 | memset(&dest->root_item.drop_progress, 0, | |
1944 | sizeof(dest->root_item.drop_progress)); | |
1945 | dest->root_item.drop_level = 0; | |
1946 | btrfs_set_root_refs(&dest->root_item, 0); | |
1947 | ||
d68fc57b YZ |
1948 | if (!xchg(&dest->orphan_item_inserted, 1)) { |
1949 | ret = btrfs_insert_orphan_item(trans, | |
1950 | root->fs_info->tree_root, | |
1951 | dest->root_key.objectid); | |
1952 | BUG_ON(ret); | |
1953 | } | |
76dda93c | 1954 | |
531cb13f | 1955 | ret = btrfs_end_transaction(trans, root); |
76dda93c YZ |
1956 | BUG_ON(ret); |
1957 | inode->i_flags |= S_DEAD; | |
1958 | out_up_write: | |
1959 | up_write(&root->fs_info->subvol_sem); | |
1960 | out_unlock: | |
1961 | mutex_unlock(&inode->i_mutex); | |
1962 | if (!err) { | |
efefb143 | 1963 | shrink_dcache_sb(root->fs_info->sb); |
76dda93c YZ |
1964 | btrfs_invalidate_inodes(dest); |
1965 | d_delete(dentry); | |
1966 | } | |
1967 | out_dput: | |
1968 | dput(dentry); | |
1969 | out_unlock_dir: | |
1970 | mutex_unlock(&dir->i_mutex); | |
1971 | mnt_drop_write(file->f_path.mnt); | |
1972 | out: | |
1973 | kfree(vol_args); | |
1974 | return err; | |
1975 | } | |
1976 | ||
1e701a32 | 1977 | static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
f46b5a66 CH |
1978 | { |
1979 | struct inode *inode = fdentry(file)->d_inode; | |
1980 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1e701a32 | 1981 | struct btrfs_ioctl_defrag_range_args *range; |
c146afad YZ |
1982 | int ret; |
1983 | ||
b83cc969 LZ |
1984 | if (btrfs_root_readonly(root)) |
1985 | return -EROFS; | |
1986 | ||
c146afad YZ |
1987 | ret = mnt_want_write(file->f_path.mnt); |
1988 | if (ret) | |
1989 | return ret; | |
f46b5a66 CH |
1990 | |
1991 | switch (inode->i_mode & S_IFMT) { | |
1992 | case S_IFDIR: | |
e441d54d CM |
1993 | if (!capable(CAP_SYS_ADMIN)) { |
1994 | ret = -EPERM; | |
1995 | goto out; | |
1996 | } | |
8929ecfa YZ |
1997 | ret = btrfs_defrag_root(root, 0); |
1998 | if (ret) | |
1999 | goto out; | |
2000 | ret = btrfs_defrag_root(root->fs_info->extent_root, 0); | |
f46b5a66 CH |
2001 | break; |
2002 | case S_IFREG: | |
e441d54d CM |
2003 | if (!(file->f_mode & FMODE_WRITE)) { |
2004 | ret = -EINVAL; | |
2005 | goto out; | |
2006 | } | |
1e701a32 CM |
2007 | |
2008 | range = kzalloc(sizeof(*range), GFP_KERNEL); | |
2009 | if (!range) { | |
2010 | ret = -ENOMEM; | |
2011 | goto out; | |
2012 | } | |
2013 | ||
2014 | if (argp) { | |
2015 | if (copy_from_user(range, argp, | |
2016 | sizeof(*range))) { | |
2017 | ret = -EFAULT; | |
2018 | kfree(range); | |
683be16e | 2019 | goto out; |
1e701a32 CM |
2020 | } |
2021 | /* compression requires us to start the IO */ | |
2022 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
2023 | range->flags |= BTRFS_DEFRAG_RANGE_START_IO; | |
2024 | range->extent_thresh = (u32)-1; | |
2025 | } | |
2026 | } else { | |
2027 | /* the rest are all set to zero by kzalloc */ | |
2028 | range->len = (u64)-1; | |
2029 | } | |
4cb5300b CM |
2030 | ret = btrfs_defrag_file(fdentry(file)->d_inode, file, |
2031 | range, 0, 0); | |
2032 | if (ret > 0) | |
2033 | ret = 0; | |
1e701a32 | 2034 | kfree(range); |
f46b5a66 | 2035 | break; |
8929ecfa YZ |
2036 | default: |
2037 | ret = -EINVAL; | |
f46b5a66 | 2038 | } |
e441d54d | 2039 | out: |
ab67b7c1 | 2040 | mnt_drop_write(file->f_path.mnt); |
e441d54d | 2041 | return ret; |
f46b5a66 CH |
2042 | } |
2043 | ||
b2950863 | 2044 | static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
2045 | { |
2046 | struct btrfs_ioctl_vol_args *vol_args; | |
2047 | int ret; | |
2048 | ||
e441d54d CM |
2049 | if (!capable(CAP_SYS_ADMIN)) |
2050 | return -EPERM; | |
2051 | ||
dae7b665 LZ |
2052 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
2053 | if (IS_ERR(vol_args)) | |
2054 | return PTR_ERR(vol_args); | |
f46b5a66 | 2055 | |
5516e595 | 2056 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
2057 | ret = btrfs_init_new_device(root, vol_args->name); |
2058 | ||
f46b5a66 CH |
2059 | kfree(vol_args); |
2060 | return ret; | |
2061 | } | |
2062 | ||
b2950863 | 2063 | static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
2064 | { |
2065 | struct btrfs_ioctl_vol_args *vol_args; | |
2066 | int ret; | |
2067 | ||
e441d54d CM |
2068 | if (!capable(CAP_SYS_ADMIN)) |
2069 | return -EPERM; | |
2070 | ||
c146afad YZ |
2071 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
2072 | return -EROFS; | |
2073 | ||
dae7b665 LZ |
2074 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
2075 | if (IS_ERR(vol_args)) | |
2076 | return PTR_ERR(vol_args); | |
f46b5a66 | 2077 | |
5516e595 | 2078 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
2079 | ret = btrfs_rm_device(root, vol_args->name); |
2080 | ||
f46b5a66 CH |
2081 | kfree(vol_args); |
2082 | return ret; | |
2083 | } | |
2084 | ||
475f6387 JS |
2085 | static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) |
2086 | { | |
027ed2f0 | 2087 | struct btrfs_ioctl_fs_info_args *fi_args; |
475f6387 JS |
2088 | struct btrfs_device *device; |
2089 | struct btrfs_device *next; | |
2090 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
027ed2f0 | 2091 | int ret = 0; |
475f6387 JS |
2092 | |
2093 | if (!capable(CAP_SYS_ADMIN)) | |
2094 | return -EPERM; | |
2095 | ||
027ed2f0 LZ |
2096 | fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); |
2097 | if (!fi_args) | |
2098 | return -ENOMEM; | |
2099 | ||
2100 | fi_args->num_devices = fs_devices->num_devices; | |
2101 | memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); | |
475f6387 JS |
2102 | |
2103 | mutex_lock(&fs_devices->device_list_mutex); | |
2104 | list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { | |
027ed2f0 LZ |
2105 | if (device->devid > fi_args->max_id) |
2106 | fi_args->max_id = device->devid; | |
475f6387 JS |
2107 | } |
2108 | mutex_unlock(&fs_devices->device_list_mutex); | |
2109 | ||
027ed2f0 LZ |
2110 | if (copy_to_user(arg, fi_args, sizeof(*fi_args))) |
2111 | ret = -EFAULT; | |
475f6387 | 2112 | |
027ed2f0 LZ |
2113 | kfree(fi_args); |
2114 | return ret; | |
475f6387 JS |
2115 | } |
2116 | ||
2117 | static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) | |
2118 | { | |
2119 | struct btrfs_ioctl_dev_info_args *di_args; | |
2120 | struct btrfs_device *dev; | |
2121 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
2122 | int ret = 0; | |
2123 | char *s_uuid = NULL; | |
2124 | char empty_uuid[BTRFS_UUID_SIZE] = {0}; | |
2125 | ||
2126 | if (!capable(CAP_SYS_ADMIN)) | |
2127 | return -EPERM; | |
2128 | ||
2129 | di_args = memdup_user(arg, sizeof(*di_args)); | |
2130 | if (IS_ERR(di_args)) | |
2131 | return PTR_ERR(di_args); | |
2132 | ||
2133 | if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0) | |
2134 | s_uuid = di_args->uuid; | |
2135 | ||
2136 | mutex_lock(&fs_devices->device_list_mutex); | |
2137 | dev = btrfs_find_device(root, di_args->devid, s_uuid, NULL); | |
2138 | mutex_unlock(&fs_devices->device_list_mutex); | |
2139 | ||
2140 | if (!dev) { | |
2141 | ret = -ENODEV; | |
2142 | goto out; | |
2143 | } | |
2144 | ||
2145 | di_args->devid = dev->devid; | |
2146 | di_args->bytes_used = dev->bytes_used; | |
2147 | di_args->total_bytes = dev->total_bytes; | |
2148 | memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); | |
2149 | strncpy(di_args->path, dev->name, sizeof(di_args->path)); | |
2150 | ||
2151 | out: | |
2152 | if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) | |
2153 | ret = -EFAULT; | |
2154 | ||
2155 | kfree(di_args); | |
2156 | return ret; | |
2157 | } | |
2158 | ||
76dda93c YZ |
2159 | static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, |
2160 | u64 off, u64 olen, u64 destoff) | |
f46b5a66 CH |
2161 | { |
2162 | struct inode *inode = fdentry(file)->d_inode; | |
2163 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2164 | struct file *src_file; | |
2165 | struct inode *src; | |
2166 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 2167 | struct btrfs_path *path; |
f46b5a66 | 2168 | struct extent_buffer *leaf; |
ae01a0ab YZ |
2169 | char *buf; |
2170 | struct btrfs_key key; | |
f46b5a66 CH |
2171 | u32 nritems; |
2172 | int slot; | |
ae01a0ab | 2173 | int ret; |
c5c9cd4d SW |
2174 | u64 len = olen; |
2175 | u64 bs = root->fs_info->sb->s_blocksize; | |
2176 | u64 hint_byte; | |
d20f7043 | 2177 | |
c5c9cd4d SW |
2178 | /* |
2179 | * TODO: | |
2180 | * - split compressed inline extents. annoying: we need to | |
2181 | * decompress into destination's address_space (the file offset | |
2182 | * may change, so source mapping won't do), then recompress (or | |
2183 | * otherwise reinsert) a subrange. | |
2184 | * - allow ranges within the same file to be cloned (provided | |
2185 | * they don't overlap)? | |
2186 | */ | |
2187 | ||
e441d54d | 2188 | /* the destination must be opened for writing */ |
2ebc3464 | 2189 | if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) |
e441d54d CM |
2190 | return -EINVAL; |
2191 | ||
b83cc969 LZ |
2192 | if (btrfs_root_readonly(root)) |
2193 | return -EROFS; | |
2194 | ||
c146afad YZ |
2195 | ret = mnt_want_write(file->f_path.mnt); |
2196 | if (ret) | |
2197 | return ret; | |
2198 | ||
c5c9cd4d | 2199 | src_file = fget(srcfd); |
ab67b7c1 YZ |
2200 | if (!src_file) { |
2201 | ret = -EBADF; | |
2202 | goto out_drop_write; | |
2203 | } | |
5dc64164 | 2204 | |
f46b5a66 CH |
2205 | src = src_file->f_dentry->d_inode; |
2206 | ||
c5c9cd4d SW |
2207 | ret = -EINVAL; |
2208 | if (src == inode) | |
2209 | goto out_fput; | |
2210 | ||
5dc64164 DR |
2211 | /* the src must be open for reading */ |
2212 | if (!(src_file->f_mode & FMODE_READ)) | |
2213 | goto out_fput; | |
2214 | ||
0e7b824c LZ |
2215 | /* don't make the dst file partly checksummed */ |
2216 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != | |
2217 | (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) | |
2218 | goto out_fput; | |
2219 | ||
ae01a0ab YZ |
2220 | ret = -EISDIR; |
2221 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) | |
2222 | goto out_fput; | |
2223 | ||
f46b5a66 | 2224 | ret = -EXDEV; |
ae01a0ab YZ |
2225 | if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) |
2226 | goto out_fput; | |
2227 | ||
2228 | ret = -ENOMEM; | |
2229 | buf = vmalloc(btrfs_level_size(root, 0)); | |
2230 | if (!buf) | |
2231 | goto out_fput; | |
2232 | ||
2233 | path = btrfs_alloc_path(); | |
2234 | if (!path) { | |
2235 | vfree(buf); | |
f46b5a66 | 2236 | goto out_fput; |
ae01a0ab YZ |
2237 | } |
2238 | path->reada = 2; | |
f46b5a66 CH |
2239 | |
2240 | if (inode < src) { | |
fccdae43 SW |
2241 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); |
2242 | mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); | |
f46b5a66 | 2243 | } else { |
fccdae43 SW |
2244 | mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); |
2245 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); | |
f46b5a66 CH |
2246 | } |
2247 | ||
c5c9cd4d SW |
2248 | /* determine range to clone */ |
2249 | ret = -EINVAL; | |
2ebc3464 | 2250 | if (off + len > src->i_size || off + len < off) |
f46b5a66 | 2251 | goto out_unlock; |
c5c9cd4d SW |
2252 | if (len == 0) |
2253 | olen = len = src->i_size - off; | |
2254 | /* if we extend to eof, continue to block boundary */ | |
2255 | if (off + len == src->i_size) | |
2a6b8dae | 2256 | len = ALIGN(src->i_size, bs) - off; |
c5c9cd4d SW |
2257 | |
2258 | /* verify the end result is block aligned */ | |
2a6b8dae LZ |
2259 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || |
2260 | !IS_ALIGNED(destoff, bs)) | |
c5c9cd4d SW |
2261 | goto out_unlock; |
2262 | ||
d525e8ab LZ |
2263 | if (destoff > inode->i_size) { |
2264 | ret = btrfs_cont_expand(inode, inode->i_size, destoff); | |
2265 | if (ret) | |
2266 | goto out_unlock; | |
2267 | } | |
2268 | ||
71ef0786 LZ |
2269 | /* truncate page cache pages from target inode range */ |
2270 | truncate_inode_pages_range(&inode->i_data, destoff, | |
2271 | PAGE_CACHE_ALIGN(destoff + len) - 1); | |
2272 | ||
f46b5a66 CH |
2273 | /* do any pending delalloc/csum calc on src, one way or |
2274 | another, and lock file content */ | |
2275 | while (1) { | |
31840ae1 | 2276 | struct btrfs_ordered_extent *ordered; |
c5c9cd4d | 2277 | lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
9a019196 SW |
2278 | ordered = btrfs_lookup_first_ordered_extent(src, off+len); |
2279 | if (!ordered && | |
2280 | !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len, | |
2281 | EXTENT_DELALLOC, 0, NULL)) | |
f46b5a66 | 2282 | break; |
c5c9cd4d | 2283 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
ae01a0ab YZ |
2284 | if (ordered) |
2285 | btrfs_put_ordered_extent(ordered); | |
9a019196 | 2286 | btrfs_wait_ordered_range(src, off, len); |
f46b5a66 CH |
2287 | } |
2288 | ||
c5c9cd4d | 2289 | /* clone data */ |
33345d01 | 2290 | key.objectid = btrfs_ino(src); |
ae01a0ab YZ |
2291 | key.type = BTRFS_EXTENT_DATA_KEY; |
2292 | key.offset = 0; | |
f46b5a66 CH |
2293 | |
2294 | while (1) { | |
2295 | /* | |
2296 | * note the key will change type as we walk through the | |
2297 | * tree. | |
2298 | */ | |
a22285a6 | 2299 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
f46b5a66 CH |
2300 | if (ret < 0) |
2301 | goto out; | |
2302 | ||
ae01a0ab YZ |
2303 | nritems = btrfs_header_nritems(path->nodes[0]); |
2304 | if (path->slots[0] >= nritems) { | |
f46b5a66 CH |
2305 | ret = btrfs_next_leaf(root, path); |
2306 | if (ret < 0) | |
2307 | goto out; | |
2308 | if (ret > 0) | |
2309 | break; | |
ae01a0ab | 2310 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
2311 | } |
2312 | leaf = path->nodes[0]; | |
2313 | slot = path->slots[0]; | |
f46b5a66 | 2314 | |
ae01a0ab | 2315 | btrfs_item_key_to_cpu(leaf, &key, slot); |
d20f7043 | 2316 | if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || |
33345d01 | 2317 | key.objectid != btrfs_ino(src)) |
f46b5a66 CH |
2318 | break; |
2319 | ||
c5c9cd4d SW |
2320 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
2321 | struct btrfs_file_extent_item *extent; | |
2322 | int type; | |
31840ae1 ZY |
2323 | u32 size; |
2324 | struct btrfs_key new_key; | |
c5c9cd4d SW |
2325 | u64 disko = 0, diskl = 0; |
2326 | u64 datao = 0, datal = 0; | |
2327 | u8 comp; | |
b5384d48 | 2328 | u64 endoff; |
31840ae1 ZY |
2329 | |
2330 | size = btrfs_item_size_nr(leaf, slot); | |
2331 | read_extent_buffer(leaf, buf, | |
2332 | btrfs_item_ptr_offset(leaf, slot), | |
2333 | size); | |
c5c9cd4d SW |
2334 | |
2335 | extent = btrfs_item_ptr(leaf, slot, | |
2336 | struct btrfs_file_extent_item); | |
2337 | comp = btrfs_file_extent_compression(leaf, extent); | |
2338 | type = btrfs_file_extent_type(leaf, extent); | |
c8a894d7 CM |
2339 | if (type == BTRFS_FILE_EXTENT_REG || |
2340 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d397712b CM |
2341 | disko = btrfs_file_extent_disk_bytenr(leaf, |
2342 | extent); | |
2343 | diskl = btrfs_file_extent_disk_num_bytes(leaf, | |
2344 | extent); | |
c5c9cd4d | 2345 | datao = btrfs_file_extent_offset(leaf, extent); |
d397712b CM |
2346 | datal = btrfs_file_extent_num_bytes(leaf, |
2347 | extent); | |
c5c9cd4d SW |
2348 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
2349 | /* take upper bound, may be compressed */ | |
2350 | datal = btrfs_file_extent_ram_bytes(leaf, | |
2351 | extent); | |
2352 | } | |
b3b4aa74 | 2353 | btrfs_release_path(path); |
31840ae1 | 2354 | |
050006a7 | 2355 | if (key.offset + datal <= off || |
c5c9cd4d SW |
2356 | key.offset >= off+len) |
2357 | goto next; | |
2358 | ||
31840ae1 | 2359 | memcpy(&new_key, &key, sizeof(new_key)); |
33345d01 | 2360 | new_key.objectid = btrfs_ino(inode); |
4d728ec7 LZ |
2361 | if (off <= key.offset) |
2362 | new_key.offset = key.offset + destoff - off; | |
2363 | else | |
2364 | new_key.offset = destoff; | |
31840ae1 | 2365 | |
b6f3409b SW |
2366 | /* |
2367 | * 1 - adjusting old extent (we may have to split it) | |
2368 | * 1 - add new extent | |
2369 | * 1 - inode update | |
2370 | */ | |
2371 | trans = btrfs_start_transaction(root, 3); | |
a22285a6 YZ |
2372 | if (IS_ERR(trans)) { |
2373 | ret = PTR_ERR(trans); | |
2374 | goto out; | |
2375 | } | |
2376 | ||
c8a894d7 CM |
2377 | if (type == BTRFS_FILE_EXTENT_REG || |
2378 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d72c0842 LZ |
2379 | /* |
2380 | * a | --- range to clone ---| b | |
2381 | * | ------------- extent ------------- | | |
2382 | */ | |
2383 | ||
2384 | /* substract range b */ | |
2385 | if (key.offset + datal > off + len) | |
2386 | datal = off + len - key.offset; | |
2387 | ||
2388 | /* substract range a */ | |
a22285a6 YZ |
2389 | if (off > key.offset) { |
2390 | datao += off - key.offset; | |
2391 | datal -= off - key.offset; | |
2392 | } | |
2393 | ||
a22285a6 YZ |
2394 | ret = btrfs_drop_extents(trans, inode, |
2395 | new_key.offset, | |
2396 | new_key.offset + datal, | |
2397 | &hint_byte, 1); | |
2398 | BUG_ON(ret); | |
2399 | ||
c5c9cd4d SW |
2400 | ret = btrfs_insert_empty_item(trans, root, path, |
2401 | &new_key, size); | |
a22285a6 | 2402 | BUG_ON(ret); |
c5c9cd4d SW |
2403 | |
2404 | leaf = path->nodes[0]; | |
2405 | slot = path->slots[0]; | |
2406 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
2407 | btrfs_item_ptr_offset(leaf, slot), |
2408 | size); | |
ae01a0ab | 2409 | |
c5c9cd4d | 2410 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 2411 | struct btrfs_file_extent_item); |
c5c9cd4d | 2412 | |
c5c9cd4d SW |
2413 | /* disko == 0 means it's a hole */ |
2414 | if (!disko) | |
2415 | datao = 0; | |
c5c9cd4d SW |
2416 | |
2417 | btrfs_set_file_extent_offset(leaf, extent, | |
2418 | datao); | |
2419 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
2420 | datal); | |
2421 | if (disko) { | |
2422 | inode_add_bytes(inode, datal); | |
ae01a0ab | 2423 | ret = btrfs_inc_extent_ref(trans, root, |
5d4f98a2 YZ |
2424 | disko, diskl, 0, |
2425 | root->root_key.objectid, | |
33345d01 | 2426 | btrfs_ino(inode), |
5d4f98a2 | 2427 | new_key.offset - datao); |
31840ae1 | 2428 | BUG_ON(ret); |
f46b5a66 | 2429 | } |
c5c9cd4d SW |
2430 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
2431 | u64 skip = 0; | |
2432 | u64 trim = 0; | |
2433 | if (off > key.offset) { | |
2434 | skip = off - key.offset; | |
2435 | new_key.offset += skip; | |
2436 | } | |
d397712b | 2437 | |
c5c9cd4d SW |
2438 | if (key.offset + datal > off+len) |
2439 | trim = key.offset + datal - (off+len); | |
d397712b | 2440 | |
c5c9cd4d | 2441 | if (comp && (skip || trim)) { |
c5c9cd4d | 2442 | ret = -EINVAL; |
a22285a6 | 2443 | btrfs_end_transaction(trans, root); |
c5c9cd4d SW |
2444 | goto out; |
2445 | } | |
2446 | size -= skip + trim; | |
2447 | datal -= skip + trim; | |
a22285a6 YZ |
2448 | |
2449 | ret = btrfs_drop_extents(trans, inode, | |
2450 | new_key.offset, | |
2451 | new_key.offset + datal, | |
2452 | &hint_byte, 1); | |
2453 | BUG_ON(ret); | |
2454 | ||
c5c9cd4d SW |
2455 | ret = btrfs_insert_empty_item(trans, root, path, |
2456 | &new_key, size); | |
a22285a6 | 2457 | BUG_ON(ret); |
c5c9cd4d SW |
2458 | |
2459 | if (skip) { | |
d397712b CM |
2460 | u32 start = |
2461 | btrfs_file_extent_calc_inline_size(0); | |
c5c9cd4d SW |
2462 | memmove(buf+start, buf+start+skip, |
2463 | datal); | |
2464 | } | |
2465 | ||
2466 | leaf = path->nodes[0]; | |
2467 | slot = path->slots[0]; | |
2468 | write_extent_buffer(leaf, buf, | |
2469 | btrfs_item_ptr_offset(leaf, slot), | |
2470 | size); | |
2471 | inode_add_bytes(inode, datal); | |
f46b5a66 | 2472 | } |
c5c9cd4d SW |
2473 | |
2474 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 2475 | btrfs_release_path(path); |
c5c9cd4d | 2476 | |
a22285a6 | 2477 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
b5384d48 SW |
2478 | |
2479 | /* | |
2480 | * we round up to the block size at eof when | |
2481 | * determining which extents to clone above, | |
2482 | * but shouldn't round up the file size | |
2483 | */ | |
2484 | endoff = new_key.offset + datal; | |
5f3888ff LZ |
2485 | if (endoff > destoff+olen) |
2486 | endoff = destoff+olen; | |
b5384d48 SW |
2487 | if (endoff > inode->i_size) |
2488 | btrfs_i_size_write(inode, endoff); | |
2489 | ||
a22285a6 YZ |
2490 | ret = btrfs_update_inode(trans, root, inode); |
2491 | BUG_ON(ret); | |
2492 | btrfs_end_transaction(trans, root); | |
2493 | } | |
d397712b | 2494 | next: |
b3b4aa74 | 2495 | btrfs_release_path(path); |
f46b5a66 | 2496 | key.offset++; |
f46b5a66 | 2497 | } |
f46b5a66 CH |
2498 | ret = 0; |
2499 | out: | |
b3b4aa74 | 2500 | btrfs_release_path(path); |
c5c9cd4d | 2501 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
f46b5a66 CH |
2502 | out_unlock: |
2503 | mutex_unlock(&src->i_mutex); | |
2504 | mutex_unlock(&inode->i_mutex); | |
ae01a0ab YZ |
2505 | vfree(buf); |
2506 | btrfs_free_path(path); | |
f46b5a66 CH |
2507 | out_fput: |
2508 | fput(src_file); | |
ab67b7c1 YZ |
2509 | out_drop_write: |
2510 | mnt_drop_write(file->f_path.mnt); | |
f46b5a66 CH |
2511 | return ret; |
2512 | } | |
2513 | ||
7a865e8a | 2514 | static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) |
c5c9cd4d SW |
2515 | { |
2516 | struct btrfs_ioctl_clone_range_args args; | |
2517 | ||
7a865e8a | 2518 | if (copy_from_user(&args, argp, sizeof(args))) |
c5c9cd4d SW |
2519 | return -EFAULT; |
2520 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, | |
2521 | args.src_length, args.dest_offset); | |
2522 | } | |
2523 | ||
f46b5a66 CH |
2524 | /* |
2525 | * there are many ways the trans_start and trans_end ioctls can lead | |
2526 | * to deadlocks. They should only be used by applications that | |
2527 | * basically own the machine, and have a very in depth understanding | |
2528 | * of all the possible deadlocks and enospc problems. | |
2529 | */ | |
b2950863 | 2530 | static long btrfs_ioctl_trans_start(struct file *file) |
f46b5a66 CH |
2531 | { |
2532 | struct inode *inode = fdentry(file)->d_inode; | |
2533 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2534 | struct btrfs_trans_handle *trans; | |
1ab86aed | 2535 | int ret; |
f46b5a66 | 2536 | |
1ab86aed | 2537 | ret = -EPERM; |
df5b5520 | 2538 | if (!capable(CAP_SYS_ADMIN)) |
1ab86aed | 2539 | goto out; |
df5b5520 | 2540 | |
1ab86aed SW |
2541 | ret = -EINPROGRESS; |
2542 | if (file->private_data) | |
f46b5a66 | 2543 | goto out; |
9ca9ee09 | 2544 | |
b83cc969 LZ |
2545 | ret = -EROFS; |
2546 | if (btrfs_root_readonly(root)) | |
2547 | goto out; | |
2548 | ||
c146afad YZ |
2549 | ret = mnt_want_write(file->f_path.mnt); |
2550 | if (ret) | |
2551 | goto out; | |
2552 | ||
a4abeea4 | 2553 | atomic_inc(&root->fs_info->open_ioctl_trans); |
9ca9ee09 | 2554 | |
1ab86aed | 2555 | ret = -ENOMEM; |
7a7eaa40 | 2556 | trans = btrfs_start_ioctl_transaction(root); |
abd30bb0 | 2557 | if (IS_ERR(trans)) |
1ab86aed SW |
2558 | goto out_drop; |
2559 | ||
2560 | file->private_data = trans; | |
2561 | return 0; | |
2562 | ||
2563 | out_drop: | |
a4abeea4 | 2564 | atomic_dec(&root->fs_info->open_ioctl_trans); |
1ab86aed | 2565 | mnt_drop_write(file->f_path.mnt); |
f46b5a66 | 2566 | out: |
f46b5a66 CH |
2567 | return ret; |
2568 | } | |
2569 | ||
6ef5ed0d JB |
2570 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
2571 | { | |
2572 | struct inode *inode = fdentry(file)->d_inode; | |
2573 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2574 | struct btrfs_root *new_root; | |
2575 | struct btrfs_dir_item *di; | |
2576 | struct btrfs_trans_handle *trans; | |
2577 | struct btrfs_path *path; | |
2578 | struct btrfs_key location; | |
2579 | struct btrfs_disk_key disk_key; | |
2580 | struct btrfs_super_block *disk_super; | |
2581 | u64 features; | |
2582 | u64 objectid = 0; | |
2583 | u64 dir_id; | |
2584 | ||
2585 | if (!capable(CAP_SYS_ADMIN)) | |
2586 | return -EPERM; | |
2587 | ||
2588 | if (copy_from_user(&objectid, argp, sizeof(objectid))) | |
2589 | return -EFAULT; | |
2590 | ||
2591 | if (!objectid) | |
2592 | objectid = root->root_key.objectid; | |
2593 | ||
2594 | location.objectid = objectid; | |
2595 | location.type = BTRFS_ROOT_ITEM_KEY; | |
2596 | location.offset = (u64)-1; | |
2597 | ||
2598 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
2599 | if (IS_ERR(new_root)) | |
2600 | return PTR_ERR(new_root); | |
2601 | ||
2602 | if (btrfs_root_refs(&new_root->root_item) == 0) | |
2603 | return -ENOENT; | |
2604 | ||
2605 | path = btrfs_alloc_path(); | |
2606 | if (!path) | |
2607 | return -ENOMEM; | |
2608 | path->leave_spinning = 1; | |
2609 | ||
2610 | trans = btrfs_start_transaction(root, 1); | |
98d5dc13 | 2611 | if (IS_ERR(trans)) { |
6ef5ed0d | 2612 | btrfs_free_path(path); |
98d5dc13 | 2613 | return PTR_ERR(trans); |
6ef5ed0d JB |
2614 | } |
2615 | ||
6c41761f | 2616 | dir_id = btrfs_super_root_dir(root->fs_info->super_copy); |
6ef5ed0d JB |
2617 | di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, |
2618 | dir_id, "default", 7, 1); | |
cf1e99a4 | 2619 | if (IS_ERR_OR_NULL(di)) { |
6ef5ed0d JB |
2620 | btrfs_free_path(path); |
2621 | btrfs_end_transaction(trans, root); | |
2622 | printk(KERN_ERR "Umm, you don't have the default dir item, " | |
2623 | "this isn't going to work\n"); | |
2624 | return -ENOENT; | |
2625 | } | |
2626 | ||
2627 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); | |
2628 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); | |
2629 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
2630 | btrfs_free_path(path); | |
2631 | ||
6c41761f | 2632 | disk_super = root->fs_info->super_copy; |
6ef5ed0d JB |
2633 | features = btrfs_super_incompat_flags(disk_super); |
2634 | if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { | |
2635 | features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; | |
2636 | btrfs_set_super_incompat_flags(disk_super, features); | |
2637 | } | |
2638 | btrfs_end_transaction(trans, root); | |
2639 | ||
2640 | return 0; | |
2641 | } | |
2642 | ||
bf5fc093 JB |
2643 | static void get_block_group_info(struct list_head *groups_list, |
2644 | struct btrfs_ioctl_space_info *space) | |
2645 | { | |
2646 | struct btrfs_block_group_cache *block_group; | |
2647 | ||
2648 | space->total_bytes = 0; | |
2649 | space->used_bytes = 0; | |
2650 | space->flags = 0; | |
2651 | list_for_each_entry(block_group, groups_list, list) { | |
2652 | space->flags = block_group->flags; | |
2653 | space->total_bytes += block_group->key.offset; | |
2654 | space->used_bytes += | |
2655 | btrfs_block_group_used(&block_group->item); | |
2656 | } | |
2657 | } | |
2658 | ||
1406e432 JB |
2659 | long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) |
2660 | { | |
2661 | struct btrfs_ioctl_space_args space_args; | |
2662 | struct btrfs_ioctl_space_info space; | |
2663 | struct btrfs_ioctl_space_info *dest; | |
7fde62bf | 2664 | struct btrfs_ioctl_space_info *dest_orig; |
13f2696f | 2665 | struct btrfs_ioctl_space_info __user *user_dest; |
1406e432 | 2666 | struct btrfs_space_info *info; |
bf5fc093 JB |
2667 | u64 types[] = {BTRFS_BLOCK_GROUP_DATA, |
2668 | BTRFS_BLOCK_GROUP_SYSTEM, | |
2669 | BTRFS_BLOCK_GROUP_METADATA, | |
2670 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; | |
2671 | int num_types = 4; | |
7fde62bf | 2672 | int alloc_size; |
1406e432 | 2673 | int ret = 0; |
51788b1b | 2674 | u64 slot_count = 0; |
bf5fc093 | 2675 | int i, c; |
1406e432 JB |
2676 | |
2677 | if (copy_from_user(&space_args, | |
2678 | (struct btrfs_ioctl_space_args __user *)arg, | |
2679 | sizeof(space_args))) | |
2680 | return -EFAULT; | |
2681 | ||
bf5fc093 JB |
2682 | for (i = 0; i < num_types; i++) { |
2683 | struct btrfs_space_info *tmp; | |
2684 | ||
2685 | info = NULL; | |
2686 | rcu_read_lock(); | |
2687 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
2688 | list) { | |
2689 | if (tmp->flags == types[i]) { | |
2690 | info = tmp; | |
2691 | break; | |
2692 | } | |
2693 | } | |
2694 | rcu_read_unlock(); | |
2695 | ||
2696 | if (!info) | |
2697 | continue; | |
2698 | ||
2699 | down_read(&info->groups_sem); | |
2700 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
2701 | if (!list_empty(&info->block_groups[c])) | |
2702 | slot_count++; | |
2703 | } | |
2704 | up_read(&info->groups_sem); | |
2705 | } | |
7fde62bf CM |
2706 | |
2707 | /* space_slots == 0 means they are asking for a count */ | |
2708 | if (space_args.space_slots == 0) { | |
2709 | space_args.total_spaces = slot_count; | |
2710 | goto out; | |
2711 | } | |
bf5fc093 | 2712 | |
51788b1b | 2713 | slot_count = min_t(u64, space_args.space_slots, slot_count); |
bf5fc093 | 2714 | |
7fde62bf | 2715 | alloc_size = sizeof(*dest) * slot_count; |
bf5fc093 | 2716 | |
7fde62bf CM |
2717 | /* we generally have at most 6 or so space infos, one for each raid |
2718 | * level. So, a whole page should be more than enough for everyone | |
2719 | */ | |
2720 | if (alloc_size > PAGE_CACHE_SIZE) | |
2721 | return -ENOMEM; | |
2722 | ||
1406e432 | 2723 | space_args.total_spaces = 0; |
7fde62bf CM |
2724 | dest = kmalloc(alloc_size, GFP_NOFS); |
2725 | if (!dest) | |
2726 | return -ENOMEM; | |
2727 | dest_orig = dest; | |
1406e432 | 2728 | |
7fde62bf | 2729 | /* now we have a buffer to copy into */ |
bf5fc093 JB |
2730 | for (i = 0; i < num_types; i++) { |
2731 | struct btrfs_space_info *tmp; | |
2732 | ||
51788b1b DR |
2733 | if (!slot_count) |
2734 | break; | |
2735 | ||
bf5fc093 JB |
2736 | info = NULL; |
2737 | rcu_read_lock(); | |
2738 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
2739 | list) { | |
2740 | if (tmp->flags == types[i]) { | |
2741 | info = tmp; | |
2742 | break; | |
2743 | } | |
2744 | } | |
2745 | rcu_read_unlock(); | |
7fde62bf | 2746 | |
bf5fc093 JB |
2747 | if (!info) |
2748 | continue; | |
2749 | down_read(&info->groups_sem); | |
2750 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
2751 | if (!list_empty(&info->block_groups[c])) { | |
2752 | get_block_group_info(&info->block_groups[c], | |
2753 | &space); | |
2754 | memcpy(dest, &space, sizeof(space)); | |
2755 | dest++; | |
2756 | space_args.total_spaces++; | |
51788b1b | 2757 | slot_count--; |
bf5fc093 | 2758 | } |
51788b1b DR |
2759 | if (!slot_count) |
2760 | break; | |
bf5fc093 JB |
2761 | } |
2762 | up_read(&info->groups_sem); | |
1406e432 | 2763 | } |
1406e432 | 2764 | |
7fde62bf CM |
2765 | user_dest = (struct btrfs_ioctl_space_info *) |
2766 | (arg + sizeof(struct btrfs_ioctl_space_args)); | |
2767 | ||
2768 | if (copy_to_user(user_dest, dest_orig, alloc_size)) | |
2769 | ret = -EFAULT; | |
2770 | ||
2771 | kfree(dest_orig); | |
2772 | out: | |
2773 | if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) | |
1406e432 JB |
2774 | ret = -EFAULT; |
2775 | ||
2776 | return ret; | |
2777 | } | |
2778 | ||
f46b5a66 CH |
2779 | /* |
2780 | * there are many ways the trans_start and trans_end ioctls can lead | |
2781 | * to deadlocks. They should only be used by applications that | |
2782 | * basically own the machine, and have a very in depth understanding | |
2783 | * of all the possible deadlocks and enospc problems. | |
2784 | */ | |
2785 | long btrfs_ioctl_trans_end(struct file *file) | |
2786 | { | |
2787 | struct inode *inode = fdentry(file)->d_inode; | |
2788 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2789 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 2790 | |
f46b5a66 | 2791 | trans = file->private_data; |
1ab86aed SW |
2792 | if (!trans) |
2793 | return -EINVAL; | |
b214107e | 2794 | file->private_data = NULL; |
9ca9ee09 | 2795 | |
1ab86aed SW |
2796 | btrfs_end_transaction(trans, root); |
2797 | ||
a4abeea4 | 2798 | atomic_dec(&root->fs_info->open_ioctl_trans); |
9ca9ee09 | 2799 | |
cfc8ea87 | 2800 | mnt_drop_write(file->f_path.mnt); |
1ab86aed | 2801 | return 0; |
f46b5a66 CH |
2802 | } |
2803 | ||
46204592 SW |
2804 | static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) |
2805 | { | |
2806 | struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; | |
2807 | struct btrfs_trans_handle *trans; | |
2808 | u64 transid; | |
db5b493a | 2809 | int ret; |
46204592 SW |
2810 | |
2811 | trans = btrfs_start_transaction(root, 0); | |
98d5dc13 TI |
2812 | if (IS_ERR(trans)) |
2813 | return PTR_ERR(trans); | |
46204592 | 2814 | transid = trans->transid; |
db5b493a | 2815 | ret = btrfs_commit_transaction_async(trans, root, 0); |
8b2b2d3c TI |
2816 | if (ret) { |
2817 | btrfs_end_transaction(trans, root); | |
db5b493a | 2818 | return ret; |
8b2b2d3c | 2819 | } |
46204592 SW |
2820 | |
2821 | if (argp) | |
2822 | if (copy_to_user(argp, &transid, sizeof(transid))) | |
2823 | return -EFAULT; | |
2824 | return 0; | |
2825 | } | |
2826 | ||
2827 | static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) | |
2828 | { | |
2829 | struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; | |
2830 | u64 transid; | |
2831 | ||
2832 | if (argp) { | |
2833 | if (copy_from_user(&transid, argp, sizeof(transid))) | |
2834 | return -EFAULT; | |
2835 | } else { | |
2836 | transid = 0; /* current trans */ | |
2837 | } | |
2838 | return btrfs_wait_for_commit(root, transid); | |
2839 | } | |
2840 | ||
475f6387 JS |
2841 | static long btrfs_ioctl_scrub(struct btrfs_root *root, void __user *arg) |
2842 | { | |
2843 | int ret; | |
2844 | struct btrfs_ioctl_scrub_args *sa; | |
2845 | ||
2846 | if (!capable(CAP_SYS_ADMIN)) | |
2847 | return -EPERM; | |
2848 | ||
2849 | sa = memdup_user(arg, sizeof(*sa)); | |
2850 | if (IS_ERR(sa)) | |
2851 | return PTR_ERR(sa); | |
2852 | ||
2853 | ret = btrfs_scrub_dev(root, sa->devid, sa->start, sa->end, | |
8628764e | 2854 | &sa->progress, sa->flags & BTRFS_SCRUB_READONLY); |
475f6387 JS |
2855 | |
2856 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
2857 | ret = -EFAULT; | |
2858 | ||
2859 | kfree(sa); | |
2860 | return ret; | |
2861 | } | |
2862 | ||
2863 | static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) | |
2864 | { | |
2865 | if (!capable(CAP_SYS_ADMIN)) | |
2866 | return -EPERM; | |
2867 | ||
2868 | return btrfs_scrub_cancel(root); | |
2869 | } | |
2870 | ||
2871 | static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, | |
2872 | void __user *arg) | |
2873 | { | |
2874 | struct btrfs_ioctl_scrub_args *sa; | |
2875 | int ret; | |
2876 | ||
2877 | if (!capable(CAP_SYS_ADMIN)) | |
2878 | return -EPERM; | |
2879 | ||
2880 | sa = memdup_user(arg, sizeof(*sa)); | |
2881 | if (IS_ERR(sa)) | |
2882 | return PTR_ERR(sa); | |
2883 | ||
2884 | ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); | |
2885 | ||
2886 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
2887 | ret = -EFAULT; | |
2888 | ||
2889 | kfree(sa); | |
2890 | return ret; | |
2891 | } | |
2892 | ||
f46b5a66 CH |
2893 | long btrfs_ioctl(struct file *file, unsigned int |
2894 | cmd, unsigned long arg) | |
2895 | { | |
2896 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; | |
4bcabaa3 | 2897 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
2898 | |
2899 | switch (cmd) { | |
6cbff00f CH |
2900 | case FS_IOC_GETFLAGS: |
2901 | return btrfs_ioctl_getflags(file, argp); | |
2902 | case FS_IOC_SETFLAGS: | |
2903 | return btrfs_ioctl_setflags(file, argp); | |
2904 | case FS_IOC_GETVERSION: | |
2905 | return btrfs_ioctl_getversion(file, argp); | |
f7039b1d LD |
2906 | case FITRIM: |
2907 | return btrfs_ioctl_fitrim(file, argp); | |
f46b5a66 | 2908 | case BTRFS_IOC_SNAP_CREATE: |
fa0d2b9b | 2909 | return btrfs_ioctl_snap_create(file, argp, 0); |
fdfb1e4f | 2910 | case BTRFS_IOC_SNAP_CREATE_V2: |
fa0d2b9b | 2911 | return btrfs_ioctl_snap_create_v2(file, argp, 0); |
3de4586c | 2912 | case BTRFS_IOC_SUBVOL_CREATE: |
fa0d2b9b | 2913 | return btrfs_ioctl_snap_create(file, argp, 1); |
76dda93c YZ |
2914 | case BTRFS_IOC_SNAP_DESTROY: |
2915 | return btrfs_ioctl_snap_destroy(file, argp); | |
0caa102d LZ |
2916 | case BTRFS_IOC_SUBVOL_GETFLAGS: |
2917 | return btrfs_ioctl_subvol_getflags(file, argp); | |
2918 | case BTRFS_IOC_SUBVOL_SETFLAGS: | |
2919 | return btrfs_ioctl_subvol_setflags(file, argp); | |
6ef5ed0d JB |
2920 | case BTRFS_IOC_DEFAULT_SUBVOL: |
2921 | return btrfs_ioctl_default_subvol(file, argp); | |
f46b5a66 | 2922 | case BTRFS_IOC_DEFRAG: |
1e701a32 CM |
2923 | return btrfs_ioctl_defrag(file, NULL); |
2924 | case BTRFS_IOC_DEFRAG_RANGE: | |
2925 | return btrfs_ioctl_defrag(file, argp); | |
f46b5a66 | 2926 | case BTRFS_IOC_RESIZE: |
4bcabaa3 | 2927 | return btrfs_ioctl_resize(root, argp); |
f46b5a66 | 2928 | case BTRFS_IOC_ADD_DEV: |
4bcabaa3 | 2929 | return btrfs_ioctl_add_dev(root, argp); |
f46b5a66 | 2930 | case BTRFS_IOC_RM_DEV: |
4bcabaa3 | 2931 | return btrfs_ioctl_rm_dev(root, argp); |
475f6387 JS |
2932 | case BTRFS_IOC_FS_INFO: |
2933 | return btrfs_ioctl_fs_info(root, argp); | |
2934 | case BTRFS_IOC_DEV_INFO: | |
2935 | return btrfs_ioctl_dev_info(root, argp); | |
f46b5a66 CH |
2936 | case BTRFS_IOC_BALANCE: |
2937 | return btrfs_balance(root->fs_info->dev_root); | |
2938 | case BTRFS_IOC_CLONE: | |
c5c9cd4d SW |
2939 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
2940 | case BTRFS_IOC_CLONE_RANGE: | |
7a865e8a | 2941 | return btrfs_ioctl_clone_range(file, argp); |
f46b5a66 CH |
2942 | case BTRFS_IOC_TRANS_START: |
2943 | return btrfs_ioctl_trans_start(file); | |
2944 | case BTRFS_IOC_TRANS_END: | |
2945 | return btrfs_ioctl_trans_end(file); | |
ac8e9819 CM |
2946 | case BTRFS_IOC_TREE_SEARCH: |
2947 | return btrfs_ioctl_tree_search(file, argp); | |
2948 | case BTRFS_IOC_INO_LOOKUP: | |
2949 | return btrfs_ioctl_ino_lookup(file, argp); | |
1406e432 JB |
2950 | case BTRFS_IOC_SPACE_INFO: |
2951 | return btrfs_ioctl_space_info(root, argp); | |
f46b5a66 CH |
2952 | case BTRFS_IOC_SYNC: |
2953 | btrfs_sync_fs(file->f_dentry->d_sb, 1); | |
2954 | return 0; | |
46204592 SW |
2955 | case BTRFS_IOC_START_SYNC: |
2956 | return btrfs_ioctl_start_sync(file, argp); | |
2957 | case BTRFS_IOC_WAIT_SYNC: | |
2958 | return btrfs_ioctl_wait_sync(file, argp); | |
475f6387 JS |
2959 | case BTRFS_IOC_SCRUB: |
2960 | return btrfs_ioctl_scrub(root, argp); | |
2961 | case BTRFS_IOC_SCRUB_CANCEL: | |
2962 | return btrfs_ioctl_scrub_cancel(root, argp); | |
2963 | case BTRFS_IOC_SCRUB_PROGRESS: | |
2964 | return btrfs_ioctl_scrub_progress(root, argp); | |
f46b5a66 CH |
2965 | } |
2966 | ||
2967 | return -ENOTTY; | |
2968 | } |