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> | |
30 | #include <linux/smp_lock.h> | |
31 | #include <linux/backing-dev.h> | |
cb8e7090 | 32 | #include <linux/mount.h> |
f46b5a66 | 33 | #include <linux/mpage.h> |
cb8e7090 | 34 | #include <linux/namei.h> |
f46b5a66 CH |
35 | #include <linux/swap.h> |
36 | #include <linux/writeback.h> | |
37 | #include <linux/statfs.h> | |
38 | #include <linux/compat.h> | |
39 | #include <linux/bit_spinlock.h> | |
cb8e7090 | 40 | #include <linux/security.h> |
f46b5a66 CH |
41 | #include <linux/version.h> |
42 | #include <linux/xattr.h> | |
7ea394f1 | 43 | #include <linux/vmalloc.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" |
f46b5a66 CH |
53 | |
54 | ||
55 | ||
cb8e7090 CH |
56 | static noinline int create_subvol(struct btrfs_root *root, |
57 | struct dentry *dentry, | |
58 | char *name, int namelen) | |
f46b5a66 CH |
59 | { |
60 | struct btrfs_trans_handle *trans; | |
61 | struct btrfs_key key; | |
62 | struct btrfs_root_item root_item; | |
63 | struct btrfs_inode_item *inode_item; | |
64 | struct extent_buffer *leaf; | |
65 | struct btrfs_root *new_root = root; | |
66 | struct inode *dir; | |
67 | int ret; | |
68 | int err; | |
69 | u64 objectid; | |
70 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
3de4586c | 71 | u64 index = 0; |
f46b5a66 CH |
72 | unsigned long nr = 1; |
73 | ||
f46b5a66 CH |
74 | ret = btrfs_check_free_space(root, 1, 0); |
75 | if (ret) | |
76 | goto fail_commit; | |
77 | ||
78 | trans = btrfs_start_transaction(root, 1); | |
79 | BUG_ON(!trans); | |
80 | ||
81 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
82 | 0, &objectid); | |
83 | if (ret) | |
84 | goto fail; | |
85 | ||
31840ae1 ZY |
86 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, |
87 | objectid, trans->transid, 0, 0, 0); | |
8e8a1e31 JB |
88 | if (IS_ERR(leaf)) { |
89 | ret = PTR_ERR(leaf); | |
90 | goto fail; | |
91 | } | |
f46b5a66 CH |
92 | |
93 | btrfs_set_header_nritems(leaf, 0); | |
94 | btrfs_set_header_level(leaf, 0); | |
95 | btrfs_set_header_bytenr(leaf, leaf->start); | |
96 | btrfs_set_header_generation(leaf, trans->transid); | |
97 | btrfs_set_header_owner(leaf, objectid); | |
98 | ||
99 | write_extent_buffer(leaf, root->fs_info->fsid, | |
100 | (unsigned long)btrfs_header_fsid(leaf), | |
101 | BTRFS_FSID_SIZE); | |
102 | btrfs_mark_buffer_dirty(leaf); | |
103 | ||
104 | inode_item = &root_item.inode; | |
105 | memset(inode_item, 0, sizeof(*inode_item)); | |
106 | inode_item->generation = cpu_to_le64(1); | |
107 | inode_item->size = cpu_to_le64(3); | |
108 | inode_item->nlink = cpu_to_le32(1); | |
a76a3cd4 | 109 | inode_item->nbytes = cpu_to_le64(root->leafsize); |
f46b5a66 CH |
110 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); |
111 | ||
112 | btrfs_set_root_bytenr(&root_item, leaf->start); | |
84234f3a | 113 | btrfs_set_root_generation(&root_item, trans->transid); |
f46b5a66 CH |
114 | btrfs_set_root_level(&root_item, 0); |
115 | btrfs_set_root_refs(&root_item, 1); | |
116 | btrfs_set_root_used(&root_item, 0); | |
80ff3856 | 117 | btrfs_set_root_last_snapshot(&root_item, 0); |
f46b5a66 CH |
118 | |
119 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); | |
120 | root_item.drop_level = 0; | |
121 | ||
925baedd | 122 | btrfs_tree_unlock(leaf); |
f46b5a66 CH |
123 | free_extent_buffer(leaf); |
124 | leaf = NULL; | |
125 | ||
126 | btrfs_set_root_dirid(&root_item, new_dirid); | |
127 | ||
128 | key.objectid = objectid; | |
129 | key.offset = 1; | |
130 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
131 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
132 | &root_item); | |
133 | if (ret) | |
134 | goto fail; | |
135 | ||
136 | /* | |
137 | * insert the directory item | |
138 | */ | |
139 | key.offset = (u64)-1; | |
3de4586c CM |
140 | dir = dentry->d_parent->d_inode; |
141 | ret = btrfs_set_inode_index(dir, &index); | |
142 | BUG_ON(ret); | |
143 | ||
144 | ret = btrfs_insert_dir_item(trans, root, | |
f46b5a66 | 145 | name, namelen, dir->i_ino, &key, |
3de4586c | 146 | BTRFS_FT_DIR, index); |
f46b5a66 CH |
147 | if (ret) |
148 | goto fail; | |
0660b5af | 149 | |
52c26179 YZ |
150 | btrfs_i_size_write(dir, dir->i_size + namelen * 2); |
151 | ret = btrfs_update_inode(trans, root, dir); | |
152 | BUG_ON(ret); | |
153 | ||
0660b5af CM |
154 | /* add the backref first */ |
155 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, | |
156 | objectid, BTRFS_ROOT_BACKREF_KEY, | |
157 | root->root_key.objectid, | |
158 | dir->i_ino, index, name, namelen); | |
159 | ||
160 | BUG_ON(ret); | |
161 | ||
162 | /* now add the forward ref */ | |
163 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, | |
164 | root->root_key.objectid, BTRFS_ROOT_REF_KEY, | |
165 | objectid, | |
166 | dir->i_ino, index, name, namelen); | |
167 | ||
168 | BUG_ON(ret); | |
169 | ||
f46b5a66 CH |
170 | ret = btrfs_commit_transaction(trans, root); |
171 | if (ret) | |
172 | goto fail_commit; | |
173 | ||
3de4586c | 174 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); |
f46b5a66 CH |
175 | BUG_ON(!new_root); |
176 | ||
177 | trans = btrfs_start_transaction(new_root, 1); | |
178 | BUG_ON(!trans); | |
179 | ||
d2fb3437 | 180 | ret = btrfs_create_subvol_root(trans, new_root, dentry, new_dirid, |
f46b5a66 CH |
181 | BTRFS_I(dir)->block_group); |
182 | if (ret) | |
183 | goto fail; | |
184 | ||
f46b5a66 CH |
185 | fail: |
186 | nr = trans->blocks_used; | |
187 | err = btrfs_commit_transaction(trans, new_root); | |
188 | if (err && !ret) | |
189 | ret = err; | |
190 | fail_commit: | |
f46b5a66 | 191 | btrfs_btree_balance_dirty(root, nr); |
f46b5a66 CH |
192 | return ret; |
193 | } | |
194 | ||
3de4586c CM |
195 | static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, |
196 | char *name, int namelen) | |
f46b5a66 CH |
197 | { |
198 | struct btrfs_pending_snapshot *pending_snapshot; | |
199 | struct btrfs_trans_handle *trans; | |
3de4586c | 200 | int ret = 0; |
f46b5a66 CH |
201 | int err; |
202 | unsigned long nr = 0; | |
203 | ||
204 | if (!root->ref_cows) | |
205 | return -EINVAL; | |
206 | ||
f46b5a66 CH |
207 | ret = btrfs_check_free_space(root, 1, 0); |
208 | if (ret) | |
209 | goto fail_unlock; | |
210 | ||
3de4586c | 211 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
f46b5a66 CH |
212 | if (!pending_snapshot) { |
213 | ret = -ENOMEM; | |
214 | goto fail_unlock; | |
215 | } | |
216 | pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); | |
217 | if (!pending_snapshot->name) { | |
218 | ret = -ENOMEM; | |
219 | kfree(pending_snapshot); | |
220 | goto fail_unlock; | |
221 | } | |
222 | memcpy(pending_snapshot->name, name, namelen); | |
223 | pending_snapshot->name[namelen] = '\0'; | |
3de4586c | 224 | pending_snapshot->dentry = dentry; |
f46b5a66 CH |
225 | trans = btrfs_start_transaction(root, 1); |
226 | BUG_ON(!trans); | |
227 | pending_snapshot->root = root; | |
228 | list_add(&pending_snapshot->list, | |
229 | &trans->transaction->pending_snapshots); | |
f46b5a66 CH |
230 | err = btrfs_commit_transaction(trans, root); |
231 | ||
232 | fail_unlock: | |
f46b5a66 | 233 | btrfs_btree_balance_dirty(root, nr); |
f46b5a66 CH |
234 | return ret; |
235 | } | |
236 | ||
cb8e7090 CH |
237 | /* copy of may_create in fs/namei.c() */ |
238 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
239 | { | |
240 | if (child->d_inode) | |
241 | return -EEXIST; | |
242 | if (IS_DEADDIR(dir)) | |
243 | return -ENOENT; | |
244 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
245 | } | |
246 | ||
247 | /* | |
248 | * Create a new subvolume below @parent. This is largely modeled after | |
249 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
250 | * inside this filesystem so it's quite a bit simpler. | |
251 | */ | |
252 | static noinline int btrfs_mksubvol(struct path *parent, char *name, | |
3de4586c CM |
253 | int mode, int namelen, |
254 | struct btrfs_root *snap_src) | |
cb8e7090 CH |
255 | { |
256 | struct dentry *dentry; | |
257 | int error; | |
258 | ||
259 | mutex_lock_nested(&parent->dentry->d_inode->i_mutex, I_MUTEX_PARENT); | |
260 | ||
261 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
262 | error = PTR_ERR(dentry); | |
263 | if (IS_ERR(dentry)) | |
264 | goto out_unlock; | |
265 | ||
266 | error = -EEXIST; | |
267 | if (dentry->d_inode) | |
268 | goto out_dput; | |
269 | ||
270 | if (!IS_POSIXACL(parent->dentry->d_inode)) | |
271 | mode &= ~current->fs->umask; | |
3de4586c | 272 | |
cb8e7090 CH |
273 | error = mnt_want_write(parent->mnt); |
274 | if (error) | |
275 | goto out_dput; | |
276 | ||
277 | error = btrfs_may_create(parent->dentry->d_inode, dentry); | |
278 | if (error) | |
279 | goto out_drop_write; | |
280 | ||
cb8e7090 CH |
281 | /* |
282 | * Actually perform the low-level subvolume creation after all | |
283 | * this VFS fuzz. | |
284 | * | |
285 | * Eventually we want to pass in an inode under which we create this | |
286 | * subvolume, but for now all are under the filesystem root. | |
287 | * | |
288 | * Also we should pass on the mode eventually to allow creating new | |
289 | * subvolume with specific mode bits. | |
290 | */ | |
3de4586c | 291 | if (snap_src) { |
ea9e8b11 CM |
292 | struct dentry *dir = dentry->d_parent; |
293 | struct dentry *test = dir->d_parent; | |
294 | struct btrfs_path *path = btrfs_alloc_path(); | |
295 | int ret; | |
296 | u64 test_oid; | |
297 | u64 parent_oid = BTRFS_I(dir->d_inode)->root->root_key.objectid; | |
298 | ||
299 | test_oid = snap_src->root_key.objectid; | |
300 | ||
301 | ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, | |
302 | path, parent_oid, test_oid); | |
303 | if (ret == 0) | |
304 | goto create; | |
305 | btrfs_release_path(snap_src->fs_info->tree_root, path); | |
306 | ||
307 | /* we need to make sure we aren't creating a directory loop | |
308 | * by taking a snapshot of something that has our current | |
309 | * subvol in its directory tree. So, this loops through | |
310 | * the dentries and checks the forward refs for each subvolume | |
311 | * to see if is references the subvolume where we are | |
312 | * placing this new snapshot. | |
313 | */ | |
d397712b | 314 | while (1) { |
ea9e8b11 CM |
315 | if (!test || |
316 | dir == snap_src->fs_info->sb->s_root || | |
317 | test == snap_src->fs_info->sb->s_root || | |
318 | test->d_inode->i_sb != snap_src->fs_info->sb) { | |
319 | break; | |
320 | } | |
321 | if (S_ISLNK(test->d_inode->i_mode)) { | |
d397712b CM |
322 | printk(KERN_INFO "Btrfs symlink in snapshot " |
323 | "path, failed\n"); | |
ea9e8b11 CM |
324 | error = -EMLINK; |
325 | btrfs_free_path(path); | |
326 | goto out_drop_write; | |
327 | } | |
328 | test_oid = | |
329 | BTRFS_I(test->d_inode)->root->root_key.objectid; | |
330 | ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, | |
331 | path, test_oid, parent_oid); | |
332 | if (ret == 0) { | |
d397712b CM |
333 | printk(KERN_INFO "Btrfs snapshot creation " |
334 | "failed, looping\n"); | |
ea9e8b11 CM |
335 | error = -EMLINK; |
336 | btrfs_free_path(path); | |
337 | goto out_drop_write; | |
338 | } | |
339 | btrfs_release_path(snap_src->fs_info->tree_root, path); | |
340 | test = test->d_parent; | |
341 | } | |
342 | create: | |
343 | btrfs_free_path(path); | |
3de4586c CM |
344 | error = create_snapshot(snap_src, dentry, name, namelen); |
345 | } else { | |
346 | error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root, | |
347 | dentry, name, namelen); | |
348 | } | |
cb8e7090 CH |
349 | if (error) |
350 | goto out_drop_write; | |
351 | ||
352 | fsnotify_mkdir(parent->dentry->d_inode, dentry); | |
353 | out_drop_write: | |
354 | mnt_drop_write(parent->mnt); | |
355 | out_dput: | |
356 | dput(dentry); | |
357 | out_unlock: | |
358 | mutex_unlock(&parent->dentry->d_inode->i_mutex); | |
359 | return error; | |
360 | } | |
361 | ||
362 | ||
b2950863 | 363 | static int btrfs_defrag_file(struct file *file) |
f46b5a66 CH |
364 | { |
365 | struct inode *inode = fdentry(file)->d_inode; | |
366 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
367 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
3eaa2885 | 368 | struct btrfs_ordered_extent *ordered; |
f46b5a66 CH |
369 | struct page *page; |
370 | unsigned long last_index; | |
371 | unsigned long ra_pages = root->fs_info->bdi.ra_pages; | |
372 | unsigned long total_read = 0; | |
373 | u64 page_start; | |
374 | u64 page_end; | |
375 | unsigned long i; | |
376 | int ret; | |
377 | ||
f46b5a66 | 378 | ret = btrfs_check_free_space(root, inode->i_size, 0); |
f46b5a66 CH |
379 | if (ret) |
380 | return -ENOSPC; | |
381 | ||
382 | mutex_lock(&inode->i_mutex); | |
383 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
384 | for (i = 0; i <= last_index; i++) { | |
385 | if (total_read % ra_pages == 0) { | |
386 | btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, | |
387 | min(last_index, i + ra_pages - 1)); | |
388 | } | |
389 | total_read++; | |
3eaa2885 | 390 | again: |
f46b5a66 CH |
391 | page = grab_cache_page(inode->i_mapping, i); |
392 | if (!page) | |
393 | goto out_unlock; | |
394 | if (!PageUptodate(page)) { | |
395 | btrfs_readpage(NULL, page); | |
396 | lock_page(page); | |
397 | if (!PageUptodate(page)) { | |
398 | unlock_page(page); | |
399 | page_cache_release(page); | |
400 | goto out_unlock; | |
401 | } | |
402 | } | |
403 | ||
f46b5a66 | 404 | wait_on_page_writeback(page); |
f46b5a66 CH |
405 | |
406 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; | |
407 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
f46b5a66 | 408 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
3eaa2885 CM |
409 | |
410 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
411 | if (ordered) { | |
412 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
413 | unlock_page(page); | |
414 | page_cache_release(page); | |
415 | btrfs_start_ordered_extent(inode, ordered, 1); | |
416 | btrfs_put_ordered_extent(ordered); | |
417 | goto again; | |
418 | } | |
419 | set_page_extent_mapped(page); | |
420 | ||
f87f057b CM |
421 | /* |
422 | * this makes sure page_mkwrite is called on the | |
423 | * page if it is dirtied again later | |
424 | */ | |
425 | clear_page_dirty_for_io(page); | |
426 | ||
ea8c2819 | 427 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
f46b5a66 CH |
428 | |
429 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
430 | set_page_dirty(page); | |
431 | unlock_page(page); | |
432 | page_cache_release(page); | |
433 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
434 | } | |
435 | ||
436 | out_unlock: | |
437 | mutex_unlock(&inode->i_mutex); | |
438 | return 0; | |
439 | } | |
440 | ||
441 | /* | |
442 | * Called inside transaction, so use GFP_NOFS | |
443 | */ | |
444 | ||
445 | static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) | |
446 | { | |
447 | u64 new_size; | |
448 | u64 old_size; | |
449 | u64 devid = 1; | |
450 | struct btrfs_ioctl_vol_args *vol_args; | |
451 | struct btrfs_trans_handle *trans; | |
452 | struct btrfs_device *device = NULL; | |
453 | char *sizestr; | |
454 | char *devstr = NULL; | |
455 | int ret = 0; | |
456 | int namelen; | |
457 | int mod = 0; | |
458 | ||
c146afad YZ |
459 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
460 | return -EROFS; | |
461 | ||
e441d54d CM |
462 | if (!capable(CAP_SYS_ADMIN)) |
463 | return -EPERM; | |
464 | ||
f46b5a66 CH |
465 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
466 | ||
467 | if (!vol_args) | |
468 | return -ENOMEM; | |
469 | ||
470 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
471 | ret = -EFAULT; | |
472 | goto out; | |
473 | } | |
5516e595 MF |
474 | |
475 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 476 | namelen = strlen(vol_args->name); |
f46b5a66 | 477 | |
7d9eb12c | 478 | mutex_lock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
479 | sizestr = vol_args->name; |
480 | devstr = strchr(sizestr, ':'); | |
481 | if (devstr) { | |
482 | char *end; | |
483 | sizestr = devstr + 1; | |
484 | *devstr = '\0'; | |
485 | devstr = vol_args->name; | |
486 | devid = simple_strtoull(devstr, &end, 10); | |
487 | printk(KERN_INFO "resizing devid %llu\n", devid); | |
488 | } | |
2b82032c | 489 | device = btrfs_find_device(root, devid, NULL, NULL); |
f46b5a66 CH |
490 | if (!device) { |
491 | printk(KERN_INFO "resizer unable to find device %llu\n", devid); | |
492 | ret = -EINVAL; | |
493 | goto out_unlock; | |
494 | } | |
495 | if (!strcmp(sizestr, "max")) | |
496 | new_size = device->bdev->bd_inode->i_size; | |
497 | else { | |
498 | if (sizestr[0] == '-') { | |
499 | mod = -1; | |
500 | sizestr++; | |
501 | } else if (sizestr[0] == '+') { | |
502 | mod = 1; | |
503 | sizestr++; | |
504 | } | |
505 | new_size = btrfs_parse_size(sizestr); | |
506 | if (new_size == 0) { | |
507 | ret = -EINVAL; | |
508 | goto out_unlock; | |
509 | } | |
510 | } | |
511 | ||
512 | old_size = device->total_bytes; | |
513 | ||
514 | if (mod < 0) { | |
515 | if (new_size > old_size) { | |
516 | ret = -EINVAL; | |
517 | goto out_unlock; | |
518 | } | |
519 | new_size = old_size - new_size; | |
520 | } else if (mod > 0) { | |
521 | new_size = old_size + new_size; | |
522 | } | |
523 | ||
524 | if (new_size < 256 * 1024 * 1024) { | |
525 | ret = -EINVAL; | |
526 | goto out_unlock; | |
527 | } | |
528 | if (new_size > device->bdev->bd_inode->i_size) { | |
529 | ret = -EFBIG; | |
530 | goto out_unlock; | |
531 | } | |
532 | ||
533 | do_div(new_size, root->sectorsize); | |
534 | new_size *= root->sectorsize; | |
535 | ||
536 | printk(KERN_INFO "new size for %s is %llu\n", | |
537 | device->name, (unsigned long long)new_size); | |
538 | ||
539 | if (new_size > old_size) { | |
540 | trans = btrfs_start_transaction(root, 1); | |
541 | ret = btrfs_grow_device(trans, device, new_size); | |
542 | btrfs_commit_transaction(trans, root); | |
543 | } else { | |
544 | ret = btrfs_shrink_device(device, new_size); | |
545 | } | |
546 | ||
547 | out_unlock: | |
7d9eb12c | 548 | mutex_unlock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
549 | out: |
550 | kfree(vol_args); | |
551 | return ret; | |
552 | } | |
553 | ||
cb8e7090 | 554 | static noinline int btrfs_ioctl_snap_create(struct file *file, |
3de4586c | 555 | void __user *arg, int subvol) |
f46b5a66 | 556 | { |
cb8e7090 | 557 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
f46b5a66 CH |
558 | struct btrfs_ioctl_vol_args *vol_args; |
559 | struct btrfs_dir_item *di; | |
560 | struct btrfs_path *path; | |
3de4586c | 561 | struct file *src_file; |
f46b5a66 CH |
562 | u64 root_dirid; |
563 | int namelen; | |
3de4586c | 564 | int ret = 0; |
f46b5a66 | 565 | |
c146afad YZ |
566 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
567 | return -EROFS; | |
568 | ||
f46b5a66 CH |
569 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
570 | ||
571 | if (!vol_args) | |
572 | return -ENOMEM; | |
573 | ||
574 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
575 | ret = -EFAULT; | |
576 | goto out; | |
577 | } | |
578 | ||
5516e595 | 579 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 | 580 | namelen = strlen(vol_args->name); |
f46b5a66 CH |
581 | if (strchr(vol_args->name, '/')) { |
582 | ret = -EINVAL; | |
583 | goto out; | |
584 | } | |
585 | ||
586 | path = btrfs_alloc_path(); | |
587 | if (!path) { | |
588 | ret = -ENOMEM; | |
589 | goto out; | |
590 | } | |
591 | ||
592 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
f46b5a66 CH |
593 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, |
594 | path, root_dirid, | |
595 | vol_args->name, namelen, 0); | |
f46b5a66 CH |
596 | btrfs_free_path(path); |
597 | ||
598 | if (di && !IS_ERR(di)) { | |
599 | ret = -EEXIST; | |
600 | goto out; | |
601 | } | |
602 | ||
603 | if (IS_ERR(di)) { | |
604 | ret = PTR_ERR(di); | |
605 | goto out; | |
606 | } | |
607 | ||
3de4586c | 608 | if (subvol) { |
cb8e7090 CH |
609 | ret = btrfs_mksubvol(&file->f_path, vol_args->name, |
610 | file->f_path.dentry->d_inode->i_mode, | |
3de4586c | 611 | namelen, NULL); |
cb8e7090 | 612 | } else { |
3de4586c CM |
613 | struct inode *src_inode; |
614 | src_file = fget(vol_args->fd); | |
615 | if (!src_file) { | |
616 | ret = -EINVAL; | |
617 | goto out; | |
618 | } | |
619 | ||
620 | src_inode = src_file->f_path.dentry->d_inode; | |
621 | if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { | |
d397712b CM |
622 | printk(KERN_INFO "btrfs: Snapshot src from " |
623 | "another FS\n"); | |
3de4586c CM |
624 | ret = -EINVAL; |
625 | fput(src_file); | |
626 | goto out; | |
627 | } | |
628 | ret = btrfs_mksubvol(&file->f_path, vol_args->name, | |
629 | file->f_path.dentry->d_inode->i_mode, | |
630 | namelen, BTRFS_I(src_inode)->root); | |
631 | fput(src_file); | |
cb8e7090 CH |
632 | } |
633 | ||
f46b5a66 CH |
634 | out: |
635 | kfree(vol_args); | |
636 | return ret; | |
637 | } | |
638 | ||
639 | static int btrfs_ioctl_defrag(struct file *file) | |
640 | { | |
641 | struct inode *inode = fdentry(file)->d_inode; | |
642 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
c146afad YZ |
643 | int ret; |
644 | ||
645 | ret = mnt_want_write(file->f_path.mnt); | |
646 | if (ret) | |
647 | return ret; | |
f46b5a66 CH |
648 | |
649 | switch (inode->i_mode & S_IFMT) { | |
650 | case S_IFDIR: | |
e441d54d CM |
651 | if (!capable(CAP_SYS_ADMIN)) { |
652 | ret = -EPERM; | |
653 | goto out; | |
654 | } | |
f46b5a66 CH |
655 | btrfs_defrag_root(root, 0); |
656 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
f46b5a66 CH |
657 | break; |
658 | case S_IFREG: | |
e441d54d CM |
659 | if (!(file->f_mode & FMODE_WRITE)) { |
660 | ret = -EINVAL; | |
661 | goto out; | |
662 | } | |
f46b5a66 CH |
663 | btrfs_defrag_file(file); |
664 | break; | |
665 | } | |
e441d54d | 666 | out: |
ab67b7c1 | 667 | mnt_drop_write(file->f_path.mnt); |
e441d54d | 668 | return ret; |
f46b5a66 CH |
669 | } |
670 | ||
b2950863 | 671 | static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
672 | { |
673 | struct btrfs_ioctl_vol_args *vol_args; | |
674 | int ret; | |
675 | ||
e441d54d CM |
676 | if (!capable(CAP_SYS_ADMIN)) |
677 | return -EPERM; | |
678 | ||
f46b5a66 CH |
679 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
680 | ||
681 | if (!vol_args) | |
682 | return -ENOMEM; | |
683 | ||
684 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
685 | ret = -EFAULT; | |
686 | goto out; | |
687 | } | |
5516e595 | 688 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
689 | ret = btrfs_init_new_device(root, vol_args->name); |
690 | ||
691 | out: | |
692 | kfree(vol_args); | |
693 | return ret; | |
694 | } | |
695 | ||
b2950863 | 696 | static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
697 | { |
698 | struct btrfs_ioctl_vol_args *vol_args; | |
699 | int ret; | |
700 | ||
e441d54d CM |
701 | if (!capable(CAP_SYS_ADMIN)) |
702 | return -EPERM; | |
703 | ||
c146afad YZ |
704 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
705 | return -EROFS; | |
706 | ||
f46b5a66 CH |
707 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
708 | ||
709 | if (!vol_args) | |
710 | return -ENOMEM; | |
711 | ||
712 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
713 | ret = -EFAULT; | |
714 | goto out; | |
715 | } | |
5516e595 | 716 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
717 | ret = btrfs_rm_device(root, vol_args->name); |
718 | ||
719 | out: | |
720 | kfree(vol_args); | |
721 | return ret; | |
722 | } | |
723 | ||
b2950863 CH |
724 | static long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, |
725 | u64 off, u64 olen, u64 destoff) | |
f46b5a66 CH |
726 | { |
727 | struct inode *inode = fdentry(file)->d_inode; | |
728 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
729 | struct file *src_file; | |
730 | struct inode *src; | |
731 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 732 | struct btrfs_path *path; |
f46b5a66 | 733 | struct extent_buffer *leaf; |
ae01a0ab YZ |
734 | char *buf; |
735 | struct btrfs_key key; | |
f46b5a66 CH |
736 | u32 nritems; |
737 | int slot; | |
ae01a0ab | 738 | int ret; |
c5c9cd4d SW |
739 | u64 len = olen; |
740 | u64 bs = root->fs_info->sb->s_blocksize; | |
741 | u64 hint_byte; | |
d20f7043 | 742 | |
c5c9cd4d SW |
743 | /* |
744 | * TODO: | |
745 | * - split compressed inline extents. annoying: we need to | |
746 | * decompress into destination's address_space (the file offset | |
747 | * may change, so source mapping won't do), then recompress (or | |
748 | * otherwise reinsert) a subrange. | |
749 | * - allow ranges within the same file to be cloned (provided | |
750 | * they don't overlap)? | |
751 | */ | |
752 | ||
e441d54d CM |
753 | /* the destination must be opened for writing */ |
754 | if (!(file->f_mode & FMODE_WRITE)) | |
755 | return -EINVAL; | |
756 | ||
c146afad YZ |
757 | ret = mnt_want_write(file->f_path.mnt); |
758 | if (ret) | |
759 | return ret; | |
760 | ||
c5c9cd4d | 761 | src_file = fget(srcfd); |
ab67b7c1 YZ |
762 | if (!src_file) { |
763 | ret = -EBADF; | |
764 | goto out_drop_write; | |
765 | } | |
f46b5a66 CH |
766 | src = src_file->f_dentry->d_inode; |
767 | ||
c5c9cd4d SW |
768 | ret = -EINVAL; |
769 | if (src == inode) | |
770 | goto out_fput; | |
771 | ||
ae01a0ab YZ |
772 | ret = -EISDIR; |
773 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) | |
774 | goto out_fput; | |
775 | ||
f46b5a66 | 776 | ret = -EXDEV; |
ae01a0ab YZ |
777 | if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) |
778 | goto out_fput; | |
779 | ||
780 | ret = -ENOMEM; | |
781 | buf = vmalloc(btrfs_level_size(root, 0)); | |
782 | if (!buf) | |
783 | goto out_fput; | |
784 | ||
785 | path = btrfs_alloc_path(); | |
786 | if (!path) { | |
787 | vfree(buf); | |
f46b5a66 | 788 | goto out_fput; |
ae01a0ab YZ |
789 | } |
790 | path->reada = 2; | |
f46b5a66 CH |
791 | |
792 | if (inode < src) { | |
793 | mutex_lock(&inode->i_mutex); | |
794 | mutex_lock(&src->i_mutex); | |
795 | } else { | |
796 | mutex_lock(&src->i_mutex); | |
797 | mutex_lock(&inode->i_mutex); | |
798 | } | |
799 | ||
c5c9cd4d SW |
800 | /* determine range to clone */ |
801 | ret = -EINVAL; | |
802 | if (off >= src->i_size || off + len > src->i_size) | |
f46b5a66 | 803 | goto out_unlock; |
c5c9cd4d SW |
804 | if (len == 0) |
805 | olen = len = src->i_size - off; | |
806 | /* if we extend to eof, continue to block boundary */ | |
807 | if (off + len == src->i_size) | |
808 | len = ((src->i_size + bs-1) & ~(bs-1)) | |
809 | - off; | |
810 | ||
811 | /* verify the end result is block aligned */ | |
812 | if ((off & (bs-1)) || | |
813 | ((off + len) & (bs-1))) | |
814 | goto out_unlock; | |
815 | ||
f46b5a66 CH |
816 | /* do any pending delalloc/csum calc on src, one way or |
817 | another, and lock file content */ | |
818 | while (1) { | |
31840ae1 | 819 | struct btrfs_ordered_extent *ordered; |
c5c9cd4d SW |
820 | lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
821 | ordered = btrfs_lookup_first_ordered_extent(inode, off+len); | |
ae01a0ab | 822 | if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) |
f46b5a66 | 823 | break; |
c5c9cd4d | 824 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
ae01a0ab YZ |
825 | if (ordered) |
826 | btrfs_put_ordered_extent(ordered); | |
c5c9cd4d | 827 | btrfs_wait_ordered_range(src, off, off+len); |
f46b5a66 CH |
828 | } |
829 | ||
ae01a0ab YZ |
830 | trans = btrfs_start_transaction(root, 1); |
831 | BUG_ON(!trans); | |
832 | ||
c5c9cd4d SW |
833 | /* punch hole in destination first */ |
834 | btrfs_drop_extents(trans, root, inode, off, off+len, 0, &hint_byte); | |
835 | ||
836 | /* clone data */ | |
f46b5a66 | 837 | key.objectid = src->i_ino; |
ae01a0ab YZ |
838 | key.type = BTRFS_EXTENT_DATA_KEY; |
839 | key.offset = 0; | |
f46b5a66 CH |
840 | |
841 | while (1) { | |
842 | /* | |
843 | * note the key will change type as we walk through the | |
844 | * tree. | |
845 | */ | |
846 | ret = btrfs_search_slot(trans, root, &key, path, 0, 0); | |
847 | if (ret < 0) | |
848 | goto out; | |
849 | ||
ae01a0ab YZ |
850 | nritems = btrfs_header_nritems(path->nodes[0]); |
851 | if (path->slots[0] >= nritems) { | |
f46b5a66 CH |
852 | ret = btrfs_next_leaf(root, path); |
853 | if (ret < 0) | |
854 | goto out; | |
855 | if (ret > 0) | |
856 | break; | |
ae01a0ab | 857 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
858 | } |
859 | leaf = path->nodes[0]; | |
860 | slot = path->slots[0]; | |
f46b5a66 | 861 | |
ae01a0ab | 862 | btrfs_item_key_to_cpu(leaf, &key, slot); |
d20f7043 | 863 | if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || |
f46b5a66 CH |
864 | key.objectid != src->i_ino) |
865 | break; | |
866 | ||
c5c9cd4d SW |
867 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
868 | struct btrfs_file_extent_item *extent; | |
869 | int type; | |
31840ae1 ZY |
870 | u32 size; |
871 | struct btrfs_key new_key; | |
c5c9cd4d SW |
872 | u64 disko = 0, diskl = 0; |
873 | u64 datao = 0, datal = 0; | |
874 | u8 comp; | |
31840ae1 ZY |
875 | |
876 | size = btrfs_item_size_nr(leaf, slot); | |
877 | read_extent_buffer(leaf, buf, | |
878 | btrfs_item_ptr_offset(leaf, slot), | |
879 | size); | |
c5c9cd4d SW |
880 | |
881 | extent = btrfs_item_ptr(leaf, slot, | |
882 | struct btrfs_file_extent_item); | |
883 | comp = btrfs_file_extent_compression(leaf, extent); | |
884 | type = btrfs_file_extent_type(leaf, extent); | |
885 | if (type == BTRFS_FILE_EXTENT_REG) { | |
d397712b CM |
886 | disko = btrfs_file_extent_disk_bytenr(leaf, |
887 | extent); | |
888 | diskl = btrfs_file_extent_disk_num_bytes(leaf, | |
889 | extent); | |
c5c9cd4d | 890 | datao = btrfs_file_extent_offset(leaf, extent); |
d397712b CM |
891 | datal = btrfs_file_extent_num_bytes(leaf, |
892 | extent); | |
c5c9cd4d SW |
893 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
894 | /* take upper bound, may be compressed */ | |
895 | datal = btrfs_file_extent_ram_bytes(leaf, | |
896 | extent); | |
897 | } | |
31840ae1 ZY |
898 | btrfs_release_path(root, path); |
899 | ||
c5c9cd4d SW |
900 | if (key.offset + datal < off || |
901 | key.offset >= off+len) | |
902 | goto next; | |
903 | ||
31840ae1 ZY |
904 | memcpy(&new_key, &key, sizeof(new_key)); |
905 | new_key.objectid = inode->i_ino; | |
c5c9cd4d | 906 | new_key.offset = key.offset + destoff - off; |
31840ae1 | 907 | |
c5c9cd4d SW |
908 | if (type == BTRFS_FILE_EXTENT_REG) { |
909 | ret = btrfs_insert_empty_item(trans, root, path, | |
910 | &new_key, size); | |
911 | if (ret) | |
912 | goto out; | |
913 | ||
914 | leaf = path->nodes[0]; | |
915 | slot = path->slots[0]; | |
916 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
917 | btrfs_item_ptr_offset(leaf, slot), |
918 | size); | |
ae01a0ab | 919 | |
c5c9cd4d | 920 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 921 | struct btrfs_file_extent_item); |
c5c9cd4d SW |
922 | |
923 | if (off > key.offset) { | |
924 | datao += off - key.offset; | |
925 | datal -= off - key.offset; | |
926 | } | |
927 | if (key.offset + datao + datal + key.offset > | |
928 | off + len) | |
929 | datal = off + len - key.offset - datao; | |
930 | /* disko == 0 means it's a hole */ | |
931 | if (!disko) | |
932 | datao = 0; | |
c5c9cd4d SW |
933 | |
934 | btrfs_set_file_extent_offset(leaf, extent, | |
935 | datao); | |
936 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
937 | datal); | |
938 | if (disko) { | |
939 | inode_add_bytes(inode, datal); | |
ae01a0ab | 940 | ret = btrfs_inc_extent_ref(trans, root, |
c5c9cd4d SW |
941 | disko, diskl, leaf->start, |
942 | root->root_key.objectid, | |
943 | trans->transid, | |
944 | inode->i_ino); | |
31840ae1 | 945 | BUG_ON(ret); |
f46b5a66 | 946 | } |
c5c9cd4d SW |
947 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
948 | u64 skip = 0; | |
949 | u64 trim = 0; | |
950 | if (off > key.offset) { | |
951 | skip = off - key.offset; | |
952 | new_key.offset += skip; | |
953 | } | |
d397712b | 954 | |
c5c9cd4d SW |
955 | if (key.offset + datal > off+len) |
956 | trim = key.offset + datal - (off+len); | |
d397712b | 957 | |
c5c9cd4d | 958 | if (comp && (skip || trim)) { |
c5c9cd4d SW |
959 | ret = -EINVAL; |
960 | goto out; | |
961 | } | |
962 | size -= skip + trim; | |
963 | datal -= skip + trim; | |
964 | ret = btrfs_insert_empty_item(trans, root, path, | |
965 | &new_key, size); | |
966 | if (ret) | |
967 | goto out; | |
968 | ||
969 | if (skip) { | |
d397712b CM |
970 | u32 start = |
971 | btrfs_file_extent_calc_inline_size(0); | |
c5c9cd4d SW |
972 | memmove(buf+start, buf+start+skip, |
973 | datal); | |
974 | } | |
975 | ||
976 | leaf = path->nodes[0]; | |
977 | slot = path->slots[0]; | |
978 | write_extent_buffer(leaf, buf, | |
979 | btrfs_item_ptr_offset(leaf, slot), | |
980 | size); | |
981 | inode_add_bytes(inode, datal); | |
f46b5a66 | 982 | } |
c5c9cd4d SW |
983 | |
984 | btrfs_mark_buffer_dirty(leaf); | |
ae01a0ab | 985 | } |
c5c9cd4d | 986 | |
d397712b | 987 | next: |
31840ae1 | 988 | btrfs_release_path(root, path); |
f46b5a66 | 989 | key.offset++; |
f46b5a66 | 990 | } |
f46b5a66 CH |
991 | ret = 0; |
992 | out: | |
ae01a0ab YZ |
993 | btrfs_release_path(root, path); |
994 | if (ret == 0) { | |
995 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
c5c9cd4d SW |
996 | if (destoff + olen > inode->i_size) |
997 | btrfs_i_size_write(inode, destoff + olen); | |
ae01a0ab YZ |
998 | BTRFS_I(inode)->flags = BTRFS_I(src)->flags; |
999 | ret = btrfs_update_inode(trans, root, inode); | |
1000 | } | |
f46b5a66 | 1001 | btrfs_end_transaction(trans, root); |
c5c9cd4d | 1002 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
ae01a0ab YZ |
1003 | if (ret) |
1004 | vmtruncate(inode, 0); | |
f46b5a66 CH |
1005 | out_unlock: |
1006 | mutex_unlock(&src->i_mutex); | |
1007 | mutex_unlock(&inode->i_mutex); | |
ae01a0ab YZ |
1008 | vfree(buf); |
1009 | btrfs_free_path(path); | |
f46b5a66 CH |
1010 | out_fput: |
1011 | fput(src_file); | |
ab67b7c1 YZ |
1012 | out_drop_write: |
1013 | mnt_drop_write(file->f_path.mnt); | |
f46b5a66 CH |
1014 | return ret; |
1015 | } | |
1016 | ||
7a865e8a | 1017 | static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) |
c5c9cd4d SW |
1018 | { |
1019 | struct btrfs_ioctl_clone_range_args args; | |
1020 | ||
7a865e8a | 1021 | if (copy_from_user(&args, argp, sizeof(args))) |
c5c9cd4d SW |
1022 | return -EFAULT; |
1023 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, | |
1024 | args.src_length, args.dest_offset); | |
1025 | } | |
1026 | ||
f46b5a66 CH |
1027 | /* |
1028 | * there are many ways the trans_start and trans_end ioctls can lead | |
1029 | * to deadlocks. They should only be used by applications that | |
1030 | * basically own the machine, and have a very in depth understanding | |
1031 | * of all the possible deadlocks and enospc problems. | |
1032 | */ | |
b2950863 | 1033 | static long btrfs_ioctl_trans_start(struct file *file) |
f46b5a66 CH |
1034 | { |
1035 | struct inode *inode = fdentry(file)->d_inode; | |
1036 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1037 | struct btrfs_trans_handle *trans; | |
1038 | int ret = 0; | |
1039 | ||
df5b5520 CH |
1040 | if (!capable(CAP_SYS_ADMIN)) |
1041 | return -EPERM; | |
1042 | ||
f46b5a66 CH |
1043 | if (file->private_data) { |
1044 | ret = -EINPROGRESS; | |
1045 | goto out; | |
1046 | } | |
9ca9ee09 | 1047 | |
c146afad YZ |
1048 | ret = mnt_want_write(file->f_path.mnt); |
1049 | if (ret) | |
1050 | goto out; | |
1051 | ||
9ca9ee09 SW |
1052 | mutex_lock(&root->fs_info->trans_mutex); |
1053 | root->fs_info->open_ioctl_trans++; | |
1054 | mutex_unlock(&root->fs_info->trans_mutex); | |
1055 | ||
1056 | trans = btrfs_start_ioctl_transaction(root, 0); | |
f46b5a66 CH |
1057 | if (trans) |
1058 | file->private_data = trans; | |
1059 | else | |
1060 | ret = -ENOMEM; | |
1061 | /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/ | |
1062 | out: | |
f46b5a66 CH |
1063 | return ret; |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * there are many ways the trans_start and trans_end ioctls can lead | |
1068 | * to deadlocks. They should only be used by applications that | |
1069 | * basically own the machine, and have a very in depth understanding | |
1070 | * of all the possible deadlocks and enospc problems. | |
1071 | */ | |
1072 | long btrfs_ioctl_trans_end(struct file *file) | |
1073 | { | |
1074 | struct inode *inode = fdentry(file)->d_inode; | |
1075 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1076 | struct btrfs_trans_handle *trans; | |
1077 | int ret = 0; | |
1078 | ||
f46b5a66 CH |
1079 | trans = file->private_data; |
1080 | if (!trans) { | |
1081 | ret = -EINVAL; | |
1082 | goto out; | |
1083 | } | |
1084 | btrfs_end_transaction(trans, root); | |
b214107e | 1085 | file->private_data = NULL; |
9ca9ee09 SW |
1086 | |
1087 | mutex_lock(&root->fs_info->trans_mutex); | |
1088 | root->fs_info->open_ioctl_trans--; | |
1089 | mutex_unlock(&root->fs_info->trans_mutex); | |
1090 | ||
cfc8ea87 SW |
1091 | mnt_drop_write(file->f_path.mnt); |
1092 | ||
f46b5a66 | 1093 | out: |
f46b5a66 CH |
1094 | return ret; |
1095 | } | |
1096 | ||
1097 | long btrfs_ioctl(struct file *file, unsigned int | |
1098 | cmd, unsigned long arg) | |
1099 | { | |
1100 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; | |
4bcabaa3 | 1101 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
1102 | |
1103 | switch (cmd) { | |
1104 | case BTRFS_IOC_SNAP_CREATE: | |
4bcabaa3 | 1105 | return btrfs_ioctl_snap_create(file, argp, 0); |
3de4586c | 1106 | case BTRFS_IOC_SUBVOL_CREATE: |
4bcabaa3 | 1107 | return btrfs_ioctl_snap_create(file, argp, 1); |
f46b5a66 CH |
1108 | case BTRFS_IOC_DEFRAG: |
1109 | return btrfs_ioctl_defrag(file); | |
1110 | case BTRFS_IOC_RESIZE: | |
4bcabaa3 | 1111 | return btrfs_ioctl_resize(root, argp); |
f46b5a66 | 1112 | case BTRFS_IOC_ADD_DEV: |
4bcabaa3 | 1113 | return btrfs_ioctl_add_dev(root, argp); |
f46b5a66 | 1114 | case BTRFS_IOC_RM_DEV: |
4bcabaa3 | 1115 | return btrfs_ioctl_rm_dev(root, argp); |
f46b5a66 CH |
1116 | case BTRFS_IOC_BALANCE: |
1117 | return btrfs_balance(root->fs_info->dev_root); | |
1118 | case BTRFS_IOC_CLONE: | |
c5c9cd4d SW |
1119 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
1120 | case BTRFS_IOC_CLONE_RANGE: | |
7a865e8a | 1121 | return btrfs_ioctl_clone_range(file, argp); |
f46b5a66 CH |
1122 | case BTRFS_IOC_TRANS_START: |
1123 | return btrfs_ioctl_trans_start(file); | |
1124 | case BTRFS_IOC_TRANS_END: | |
1125 | return btrfs_ioctl_trans_end(file); | |
1126 | case BTRFS_IOC_SYNC: | |
1127 | btrfs_sync_fs(file->f_dentry->d_sb, 1); | |
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | return -ENOTTY; | |
1132 | } |