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Commit | Line | Data |
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f46b5a66 CH |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/bio.h> | |
21 | #include <linux/buffer_head.h> | |
22 | #include <linux/file.h> | |
23 | #include <linux/fs.h> | |
cb8e7090 | 24 | #include <linux/fsnotify.h> |
f46b5a66 CH |
25 | #include <linux/pagemap.h> |
26 | #include <linux/highmem.h> | |
27 | #include <linux/time.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/string.h> | |
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> |
f46b5a66 CH |
44 | #include "ctree.h" |
45 | #include "disk-io.h" | |
46 | #include "transaction.h" | |
47 | #include "btrfs_inode.h" | |
48 | #include "ioctl.h" | |
49 | #include "print-tree.h" | |
50 | #include "volumes.h" | |
925baedd | 51 | #include "locking.h" |
f46b5a66 CH |
52 | |
53 | ||
54 | ||
cb8e7090 CH |
55 | static noinline int create_subvol(struct btrfs_root *root, |
56 | struct dentry *dentry, | |
57 | char *name, int namelen) | |
f46b5a66 CH |
58 | { |
59 | struct btrfs_trans_handle *trans; | |
60 | struct btrfs_key key; | |
61 | struct btrfs_root_item root_item; | |
62 | struct btrfs_inode_item *inode_item; | |
63 | struct extent_buffer *leaf; | |
64 | struct btrfs_root *new_root = root; | |
65 | struct inode *dir; | |
66 | int ret; | |
67 | int err; | |
68 | u64 objectid; | |
69 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
3de4586c | 70 | u64 index = 0; |
f46b5a66 CH |
71 | unsigned long nr = 1; |
72 | ||
f46b5a66 CH |
73 | ret = btrfs_check_free_space(root, 1, 0); |
74 | if (ret) | |
75 | goto fail_commit; | |
76 | ||
77 | trans = btrfs_start_transaction(root, 1); | |
78 | BUG_ON(!trans); | |
79 | ||
80 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
81 | 0, &objectid); | |
82 | if (ret) | |
83 | goto fail; | |
84 | ||
31840ae1 ZY |
85 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, |
86 | objectid, trans->transid, 0, 0, 0); | |
8e8a1e31 JB |
87 | if (IS_ERR(leaf)) { |
88 | ret = PTR_ERR(leaf); | |
89 | goto fail; | |
90 | } | |
f46b5a66 CH |
91 | |
92 | btrfs_set_header_nritems(leaf, 0); | |
93 | btrfs_set_header_level(leaf, 0); | |
94 | btrfs_set_header_bytenr(leaf, leaf->start); | |
95 | btrfs_set_header_generation(leaf, trans->transid); | |
96 | btrfs_set_header_owner(leaf, objectid); | |
97 | ||
98 | write_extent_buffer(leaf, root->fs_info->fsid, | |
99 | (unsigned long)btrfs_header_fsid(leaf), | |
100 | BTRFS_FSID_SIZE); | |
101 | btrfs_mark_buffer_dirty(leaf); | |
102 | ||
103 | inode_item = &root_item.inode; | |
104 | memset(inode_item, 0, sizeof(*inode_item)); | |
105 | inode_item->generation = cpu_to_le64(1); | |
106 | inode_item->size = cpu_to_le64(3); | |
107 | inode_item->nlink = cpu_to_le32(1); | |
a76a3cd4 | 108 | inode_item->nbytes = cpu_to_le64(root->leafsize); |
f46b5a66 CH |
109 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); |
110 | ||
111 | btrfs_set_root_bytenr(&root_item, leaf->start); | |
84234f3a | 112 | btrfs_set_root_generation(&root_item, trans->transid); |
f46b5a66 CH |
113 | btrfs_set_root_level(&root_item, 0); |
114 | btrfs_set_root_refs(&root_item, 1); | |
115 | btrfs_set_root_used(&root_item, 0); | |
80ff3856 | 116 | btrfs_set_root_last_snapshot(&root_item, 0); |
f46b5a66 CH |
117 | |
118 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); | |
119 | root_item.drop_level = 0; | |
120 | ||
925baedd | 121 | btrfs_tree_unlock(leaf); |
f46b5a66 CH |
122 | free_extent_buffer(leaf); |
123 | leaf = NULL; | |
124 | ||
125 | btrfs_set_root_dirid(&root_item, new_dirid); | |
126 | ||
127 | key.objectid = objectid; | |
128 | key.offset = 1; | |
129 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
130 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
131 | &root_item); | |
132 | if (ret) | |
133 | goto fail; | |
134 | ||
135 | /* | |
136 | * insert the directory item | |
137 | */ | |
138 | key.offset = (u64)-1; | |
3de4586c CM |
139 | dir = dentry->d_parent->d_inode; |
140 | ret = btrfs_set_inode_index(dir, &index); | |
141 | BUG_ON(ret); | |
142 | ||
143 | ret = btrfs_insert_dir_item(trans, root, | |
f46b5a66 | 144 | name, namelen, dir->i_ino, &key, |
3de4586c | 145 | BTRFS_FT_DIR, index); |
f46b5a66 CH |
146 | if (ret) |
147 | goto fail; | |
3de4586c | 148 | #if 0 |
f46b5a66 CH |
149 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
150 | name, namelen, objectid, | |
aec7477b | 151 | root->fs_info->sb->s_root->d_inode->i_ino, 0); |
f46b5a66 CH |
152 | if (ret) |
153 | goto fail; | |
3de4586c | 154 | #endif |
f46b5a66 CH |
155 | ret = btrfs_commit_transaction(trans, root); |
156 | if (ret) | |
157 | goto fail_commit; | |
158 | ||
3de4586c | 159 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); |
f46b5a66 CH |
160 | BUG_ON(!new_root); |
161 | ||
162 | trans = btrfs_start_transaction(new_root, 1); | |
163 | BUG_ON(!trans); | |
164 | ||
cb8e7090 | 165 | ret = btrfs_create_subvol_root(new_root, dentry, trans, new_dirid, |
f46b5a66 CH |
166 | BTRFS_I(dir)->block_group); |
167 | if (ret) | |
168 | goto fail; | |
169 | ||
f46b5a66 CH |
170 | fail: |
171 | nr = trans->blocks_used; | |
172 | err = btrfs_commit_transaction(trans, new_root); | |
173 | if (err && !ret) | |
174 | ret = err; | |
175 | fail_commit: | |
f46b5a66 | 176 | btrfs_btree_balance_dirty(root, nr); |
f46b5a66 CH |
177 | return ret; |
178 | } | |
179 | ||
3de4586c CM |
180 | static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, |
181 | char *name, int namelen) | |
f46b5a66 CH |
182 | { |
183 | struct btrfs_pending_snapshot *pending_snapshot; | |
184 | struct btrfs_trans_handle *trans; | |
3de4586c | 185 | int ret = 0; |
f46b5a66 CH |
186 | int err; |
187 | unsigned long nr = 0; | |
188 | ||
189 | if (!root->ref_cows) | |
190 | return -EINVAL; | |
191 | ||
f46b5a66 CH |
192 | ret = btrfs_check_free_space(root, 1, 0); |
193 | if (ret) | |
194 | goto fail_unlock; | |
195 | ||
3de4586c | 196 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
f46b5a66 CH |
197 | if (!pending_snapshot) { |
198 | ret = -ENOMEM; | |
199 | goto fail_unlock; | |
200 | } | |
201 | pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); | |
202 | if (!pending_snapshot->name) { | |
203 | ret = -ENOMEM; | |
204 | kfree(pending_snapshot); | |
205 | goto fail_unlock; | |
206 | } | |
207 | memcpy(pending_snapshot->name, name, namelen); | |
208 | pending_snapshot->name[namelen] = '\0'; | |
3de4586c | 209 | pending_snapshot->dentry = dentry; |
f46b5a66 CH |
210 | trans = btrfs_start_transaction(root, 1); |
211 | BUG_ON(!trans); | |
212 | pending_snapshot->root = root; | |
213 | list_add(&pending_snapshot->list, | |
214 | &trans->transaction->pending_snapshots); | |
f46b5a66 CH |
215 | err = btrfs_commit_transaction(trans, root); |
216 | ||
217 | fail_unlock: | |
f46b5a66 | 218 | btrfs_btree_balance_dirty(root, nr); |
f46b5a66 CH |
219 | return ret; |
220 | } | |
221 | ||
cb8e7090 CH |
222 | /* copy of may_create in fs/namei.c() */ |
223 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
224 | { | |
225 | if (child->d_inode) | |
226 | return -EEXIST; | |
227 | if (IS_DEADDIR(dir)) | |
228 | return -ENOENT; | |
229 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
230 | } | |
231 | ||
232 | /* | |
233 | * Create a new subvolume below @parent. This is largely modeled after | |
234 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
235 | * inside this filesystem so it's quite a bit simpler. | |
236 | */ | |
237 | static noinline int btrfs_mksubvol(struct path *parent, char *name, | |
3de4586c CM |
238 | int mode, int namelen, |
239 | struct btrfs_root *snap_src) | |
cb8e7090 CH |
240 | { |
241 | struct dentry *dentry; | |
242 | int error; | |
243 | ||
244 | mutex_lock_nested(&parent->dentry->d_inode->i_mutex, I_MUTEX_PARENT); | |
245 | ||
246 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
247 | error = PTR_ERR(dentry); | |
248 | if (IS_ERR(dentry)) | |
249 | goto out_unlock; | |
250 | ||
251 | error = -EEXIST; | |
252 | if (dentry->d_inode) | |
253 | goto out_dput; | |
254 | ||
255 | if (!IS_POSIXACL(parent->dentry->d_inode)) | |
256 | mode &= ~current->fs->umask; | |
3de4586c | 257 | |
cb8e7090 CH |
258 | error = mnt_want_write(parent->mnt); |
259 | if (error) | |
260 | goto out_dput; | |
261 | ||
262 | error = btrfs_may_create(parent->dentry->d_inode, dentry); | |
263 | if (error) | |
264 | goto out_drop_write; | |
265 | ||
cb8e7090 CH |
266 | /* |
267 | * Actually perform the low-level subvolume creation after all | |
268 | * this VFS fuzz. | |
269 | * | |
270 | * Eventually we want to pass in an inode under which we create this | |
271 | * subvolume, but for now all are under the filesystem root. | |
272 | * | |
273 | * Also we should pass on the mode eventually to allow creating new | |
274 | * subvolume with specific mode bits. | |
275 | */ | |
3de4586c CM |
276 | if (snap_src) { |
277 | error = create_snapshot(snap_src, dentry, name, namelen); | |
278 | } else { | |
279 | error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root, | |
280 | dentry, name, namelen); | |
281 | } | |
cb8e7090 CH |
282 | if (error) |
283 | goto out_drop_write; | |
284 | ||
285 | fsnotify_mkdir(parent->dentry->d_inode, dentry); | |
286 | out_drop_write: | |
287 | mnt_drop_write(parent->mnt); | |
288 | out_dput: | |
289 | dput(dentry); | |
290 | out_unlock: | |
291 | mutex_unlock(&parent->dentry->d_inode->i_mutex); | |
292 | return error; | |
293 | } | |
294 | ||
295 | ||
f46b5a66 CH |
296 | int btrfs_defrag_file(struct file *file) |
297 | { | |
298 | struct inode *inode = fdentry(file)->d_inode; | |
299 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
300 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
3eaa2885 | 301 | struct btrfs_ordered_extent *ordered; |
f46b5a66 CH |
302 | struct page *page; |
303 | unsigned long last_index; | |
304 | unsigned long ra_pages = root->fs_info->bdi.ra_pages; | |
305 | unsigned long total_read = 0; | |
306 | u64 page_start; | |
307 | u64 page_end; | |
308 | unsigned long i; | |
309 | int ret; | |
310 | ||
f46b5a66 | 311 | ret = btrfs_check_free_space(root, inode->i_size, 0); |
f46b5a66 CH |
312 | if (ret) |
313 | return -ENOSPC; | |
314 | ||
315 | mutex_lock(&inode->i_mutex); | |
316 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
317 | for (i = 0; i <= last_index; i++) { | |
318 | if (total_read % ra_pages == 0) { | |
319 | btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, | |
320 | min(last_index, i + ra_pages - 1)); | |
321 | } | |
322 | total_read++; | |
3eaa2885 | 323 | again: |
f46b5a66 CH |
324 | page = grab_cache_page(inode->i_mapping, i); |
325 | if (!page) | |
326 | goto out_unlock; | |
327 | if (!PageUptodate(page)) { | |
328 | btrfs_readpage(NULL, page); | |
329 | lock_page(page); | |
330 | if (!PageUptodate(page)) { | |
331 | unlock_page(page); | |
332 | page_cache_release(page); | |
333 | goto out_unlock; | |
334 | } | |
335 | } | |
336 | ||
f46b5a66 | 337 | wait_on_page_writeback(page); |
f46b5a66 CH |
338 | |
339 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; | |
340 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
f46b5a66 | 341 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
3eaa2885 CM |
342 | |
343 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
344 | if (ordered) { | |
345 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
346 | unlock_page(page); | |
347 | page_cache_release(page); | |
348 | btrfs_start_ordered_extent(inode, ordered, 1); | |
349 | btrfs_put_ordered_extent(ordered); | |
350 | goto again; | |
351 | } | |
352 | set_page_extent_mapped(page); | |
353 | ||
f87f057b CM |
354 | /* |
355 | * this makes sure page_mkwrite is called on the | |
356 | * page if it is dirtied again later | |
357 | */ | |
358 | clear_page_dirty_for_io(page); | |
359 | ||
ea8c2819 | 360 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
f46b5a66 CH |
361 | |
362 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
363 | set_page_dirty(page); | |
364 | unlock_page(page); | |
365 | page_cache_release(page); | |
366 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
367 | } | |
368 | ||
369 | out_unlock: | |
370 | mutex_unlock(&inode->i_mutex); | |
371 | return 0; | |
372 | } | |
373 | ||
374 | /* | |
375 | * Called inside transaction, so use GFP_NOFS | |
376 | */ | |
377 | ||
378 | static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) | |
379 | { | |
380 | u64 new_size; | |
381 | u64 old_size; | |
382 | u64 devid = 1; | |
383 | struct btrfs_ioctl_vol_args *vol_args; | |
384 | struct btrfs_trans_handle *trans; | |
385 | struct btrfs_device *device = NULL; | |
386 | char *sizestr; | |
387 | char *devstr = NULL; | |
388 | int ret = 0; | |
389 | int namelen; | |
390 | int mod = 0; | |
391 | ||
c146afad YZ |
392 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
393 | return -EROFS; | |
394 | ||
f46b5a66 CH |
395 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
396 | ||
397 | if (!vol_args) | |
398 | return -ENOMEM; | |
399 | ||
400 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
401 | ret = -EFAULT; | |
402 | goto out; | |
403 | } | |
5516e595 MF |
404 | |
405 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 406 | namelen = strlen(vol_args->name); |
f46b5a66 | 407 | |
7d9eb12c | 408 | mutex_lock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
409 | sizestr = vol_args->name; |
410 | devstr = strchr(sizestr, ':'); | |
411 | if (devstr) { | |
412 | char *end; | |
413 | sizestr = devstr + 1; | |
414 | *devstr = '\0'; | |
415 | devstr = vol_args->name; | |
416 | devid = simple_strtoull(devstr, &end, 10); | |
417 | printk(KERN_INFO "resizing devid %llu\n", devid); | |
418 | } | |
2b82032c | 419 | device = btrfs_find_device(root, devid, NULL, NULL); |
f46b5a66 CH |
420 | if (!device) { |
421 | printk(KERN_INFO "resizer unable to find device %llu\n", devid); | |
422 | ret = -EINVAL; | |
423 | goto out_unlock; | |
424 | } | |
425 | if (!strcmp(sizestr, "max")) | |
426 | new_size = device->bdev->bd_inode->i_size; | |
427 | else { | |
428 | if (sizestr[0] == '-') { | |
429 | mod = -1; | |
430 | sizestr++; | |
431 | } else if (sizestr[0] == '+') { | |
432 | mod = 1; | |
433 | sizestr++; | |
434 | } | |
435 | new_size = btrfs_parse_size(sizestr); | |
436 | if (new_size == 0) { | |
437 | ret = -EINVAL; | |
438 | goto out_unlock; | |
439 | } | |
440 | } | |
441 | ||
442 | old_size = device->total_bytes; | |
443 | ||
444 | if (mod < 0) { | |
445 | if (new_size > old_size) { | |
446 | ret = -EINVAL; | |
447 | goto out_unlock; | |
448 | } | |
449 | new_size = old_size - new_size; | |
450 | } else if (mod > 0) { | |
451 | new_size = old_size + new_size; | |
452 | } | |
453 | ||
454 | if (new_size < 256 * 1024 * 1024) { | |
455 | ret = -EINVAL; | |
456 | goto out_unlock; | |
457 | } | |
458 | if (new_size > device->bdev->bd_inode->i_size) { | |
459 | ret = -EFBIG; | |
460 | goto out_unlock; | |
461 | } | |
462 | ||
463 | do_div(new_size, root->sectorsize); | |
464 | new_size *= root->sectorsize; | |
465 | ||
466 | printk(KERN_INFO "new size for %s is %llu\n", | |
467 | device->name, (unsigned long long)new_size); | |
468 | ||
469 | if (new_size > old_size) { | |
470 | trans = btrfs_start_transaction(root, 1); | |
471 | ret = btrfs_grow_device(trans, device, new_size); | |
472 | btrfs_commit_transaction(trans, root); | |
473 | } else { | |
474 | ret = btrfs_shrink_device(device, new_size); | |
475 | } | |
476 | ||
477 | out_unlock: | |
7d9eb12c | 478 | mutex_unlock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
479 | out: |
480 | kfree(vol_args); | |
481 | return ret; | |
482 | } | |
483 | ||
cb8e7090 | 484 | static noinline int btrfs_ioctl_snap_create(struct file *file, |
3de4586c | 485 | void __user *arg, int subvol) |
f46b5a66 | 486 | { |
cb8e7090 | 487 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
f46b5a66 CH |
488 | struct btrfs_ioctl_vol_args *vol_args; |
489 | struct btrfs_dir_item *di; | |
490 | struct btrfs_path *path; | |
3de4586c | 491 | struct file *src_file; |
f46b5a66 CH |
492 | u64 root_dirid; |
493 | int namelen; | |
3de4586c | 494 | int ret = 0; |
f46b5a66 | 495 | |
c146afad YZ |
496 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
497 | return -EROFS; | |
498 | ||
f46b5a66 CH |
499 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
500 | ||
501 | if (!vol_args) | |
502 | return -ENOMEM; | |
503 | ||
504 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
505 | ret = -EFAULT; | |
506 | goto out; | |
507 | } | |
508 | ||
5516e595 | 509 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 | 510 | namelen = strlen(vol_args->name); |
f46b5a66 CH |
511 | if (strchr(vol_args->name, '/')) { |
512 | ret = -EINVAL; | |
513 | goto out; | |
514 | } | |
515 | ||
516 | path = btrfs_alloc_path(); | |
517 | if (!path) { | |
518 | ret = -ENOMEM; | |
519 | goto out; | |
520 | } | |
521 | ||
522 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
f46b5a66 CH |
523 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, |
524 | path, root_dirid, | |
525 | vol_args->name, namelen, 0); | |
f46b5a66 CH |
526 | btrfs_free_path(path); |
527 | ||
528 | if (di && !IS_ERR(di)) { | |
529 | ret = -EEXIST; | |
530 | goto out; | |
531 | } | |
532 | ||
533 | if (IS_ERR(di)) { | |
534 | ret = PTR_ERR(di); | |
535 | goto out; | |
536 | } | |
537 | ||
3de4586c | 538 | if (subvol) { |
cb8e7090 CH |
539 | ret = btrfs_mksubvol(&file->f_path, vol_args->name, |
540 | file->f_path.dentry->d_inode->i_mode, | |
3de4586c | 541 | namelen, NULL); |
cb8e7090 | 542 | } else { |
3de4586c CM |
543 | struct inode *src_inode; |
544 | src_file = fget(vol_args->fd); | |
545 | if (!src_file) { | |
546 | ret = -EINVAL; | |
547 | goto out; | |
548 | } | |
549 | ||
550 | src_inode = src_file->f_path.dentry->d_inode; | |
551 | if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { | |
552 | printk("btrfs: Snapshot src from another FS\n"); | |
553 | ret = -EINVAL; | |
554 | fput(src_file); | |
555 | goto out; | |
556 | } | |
557 | ret = btrfs_mksubvol(&file->f_path, vol_args->name, | |
558 | file->f_path.dentry->d_inode->i_mode, | |
559 | namelen, BTRFS_I(src_inode)->root); | |
560 | fput(src_file); | |
cb8e7090 CH |
561 | } |
562 | ||
f46b5a66 CH |
563 | out: |
564 | kfree(vol_args); | |
565 | return ret; | |
566 | } | |
567 | ||
568 | static int btrfs_ioctl_defrag(struct file *file) | |
569 | { | |
570 | struct inode *inode = fdentry(file)->d_inode; | |
571 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
c146afad YZ |
572 | int ret; |
573 | ||
574 | ret = mnt_want_write(file->f_path.mnt); | |
575 | if (ret) | |
576 | return ret; | |
f46b5a66 CH |
577 | |
578 | switch (inode->i_mode & S_IFMT) { | |
579 | case S_IFDIR: | |
f46b5a66 CH |
580 | btrfs_defrag_root(root, 0); |
581 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
f46b5a66 CH |
582 | break; |
583 | case S_IFREG: | |
584 | btrfs_defrag_file(file); | |
585 | break; | |
586 | } | |
587 | ||
588 | return 0; | |
589 | } | |
590 | ||
591 | long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) | |
592 | { | |
593 | struct btrfs_ioctl_vol_args *vol_args; | |
594 | int ret; | |
595 | ||
596 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); | |
597 | ||
598 | if (!vol_args) | |
599 | return -ENOMEM; | |
600 | ||
601 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
602 | ret = -EFAULT; | |
603 | goto out; | |
604 | } | |
5516e595 | 605 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
606 | ret = btrfs_init_new_device(root, vol_args->name); |
607 | ||
608 | out: | |
609 | kfree(vol_args); | |
610 | return ret; | |
611 | } | |
612 | ||
613 | long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) | |
614 | { | |
615 | struct btrfs_ioctl_vol_args *vol_args; | |
616 | int ret; | |
617 | ||
c146afad YZ |
618 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
619 | return -EROFS; | |
620 | ||
f46b5a66 CH |
621 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
622 | ||
623 | if (!vol_args) | |
624 | return -ENOMEM; | |
625 | ||
626 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
627 | ret = -EFAULT; | |
628 | goto out; | |
629 | } | |
5516e595 | 630 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
631 | ret = btrfs_rm_device(root, vol_args->name); |
632 | ||
633 | out: | |
634 | kfree(vol_args); | |
635 | return ret; | |
636 | } | |
637 | ||
c5c9cd4d SW |
638 | long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off, |
639 | u64 olen, u64 destoff) | |
f46b5a66 CH |
640 | { |
641 | struct inode *inode = fdentry(file)->d_inode; | |
642 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
643 | struct file *src_file; | |
644 | struct inode *src; | |
645 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 646 | struct btrfs_path *path; |
f46b5a66 | 647 | struct extent_buffer *leaf; |
ae01a0ab YZ |
648 | char *buf; |
649 | struct btrfs_key key; | |
f46b5a66 CH |
650 | u32 nritems; |
651 | int slot; | |
ae01a0ab | 652 | int ret; |
c5c9cd4d SW |
653 | u64 len = olen; |
654 | u64 bs = root->fs_info->sb->s_blocksize; | |
655 | u64 hint_byte; | |
f46b5a66 | 656 | |
c5c9cd4d SW |
657 | /* |
658 | * TODO: | |
659 | * - split compressed inline extents. annoying: we need to | |
660 | * decompress into destination's address_space (the file offset | |
661 | * may change, so source mapping won't do), then recompress (or | |
662 | * otherwise reinsert) a subrange. | |
663 | * - allow ranges within the same file to be cloned (provided | |
664 | * they don't overlap)? | |
665 | */ | |
666 | ||
c146afad YZ |
667 | ret = mnt_want_write(file->f_path.mnt); |
668 | if (ret) | |
669 | return ret; | |
670 | ||
c5c9cd4d | 671 | src_file = fget(srcfd); |
f46b5a66 CH |
672 | if (!src_file) |
673 | return -EBADF; | |
674 | src = src_file->f_dentry->d_inode; | |
675 | ||
c5c9cd4d SW |
676 | ret = -EINVAL; |
677 | if (src == inode) | |
678 | goto out_fput; | |
679 | ||
ae01a0ab YZ |
680 | ret = -EISDIR; |
681 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) | |
682 | goto out_fput; | |
683 | ||
f46b5a66 | 684 | ret = -EXDEV; |
ae01a0ab YZ |
685 | if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) |
686 | goto out_fput; | |
687 | ||
688 | ret = -ENOMEM; | |
689 | buf = vmalloc(btrfs_level_size(root, 0)); | |
690 | if (!buf) | |
691 | goto out_fput; | |
692 | ||
693 | path = btrfs_alloc_path(); | |
694 | if (!path) { | |
695 | vfree(buf); | |
f46b5a66 | 696 | goto out_fput; |
ae01a0ab YZ |
697 | } |
698 | path->reada = 2; | |
f46b5a66 CH |
699 | |
700 | if (inode < src) { | |
701 | mutex_lock(&inode->i_mutex); | |
702 | mutex_lock(&src->i_mutex); | |
703 | } else { | |
704 | mutex_lock(&src->i_mutex); | |
705 | mutex_lock(&inode->i_mutex); | |
706 | } | |
707 | ||
c5c9cd4d SW |
708 | /* determine range to clone */ |
709 | ret = -EINVAL; | |
710 | if (off >= src->i_size || off + len > src->i_size) | |
f46b5a66 | 711 | goto out_unlock; |
c5c9cd4d SW |
712 | if (len == 0) |
713 | olen = len = src->i_size - off; | |
714 | /* if we extend to eof, continue to block boundary */ | |
715 | if (off + len == src->i_size) | |
716 | len = ((src->i_size + bs-1) & ~(bs-1)) | |
717 | - off; | |
718 | ||
719 | /* verify the end result is block aligned */ | |
720 | if ((off & (bs-1)) || | |
721 | ((off + len) & (bs-1))) | |
722 | goto out_unlock; | |
723 | ||
724 | printk("final src extent is %llu~%llu\n", off, len); | |
725 | printk("final dst extent is %llu~%llu\n", destoff, len); | |
f46b5a66 CH |
726 | |
727 | /* do any pending delalloc/csum calc on src, one way or | |
728 | another, and lock file content */ | |
729 | while (1) { | |
31840ae1 | 730 | struct btrfs_ordered_extent *ordered; |
c5c9cd4d SW |
731 | lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
732 | ordered = btrfs_lookup_first_ordered_extent(inode, off+len); | |
ae01a0ab | 733 | if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) |
f46b5a66 | 734 | break; |
c5c9cd4d | 735 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
ae01a0ab YZ |
736 | if (ordered) |
737 | btrfs_put_ordered_extent(ordered); | |
c5c9cd4d | 738 | btrfs_wait_ordered_range(src, off, off+len); |
f46b5a66 CH |
739 | } |
740 | ||
ae01a0ab YZ |
741 | trans = btrfs_start_transaction(root, 1); |
742 | BUG_ON(!trans); | |
743 | ||
c5c9cd4d SW |
744 | /* punch hole in destination first */ |
745 | btrfs_drop_extents(trans, root, inode, off, off+len, 0, &hint_byte); | |
746 | ||
747 | /* clone data */ | |
f46b5a66 | 748 | key.objectid = src->i_ino; |
ae01a0ab YZ |
749 | key.type = BTRFS_EXTENT_DATA_KEY; |
750 | key.offset = 0; | |
f46b5a66 CH |
751 | |
752 | while (1) { | |
753 | /* | |
754 | * note the key will change type as we walk through the | |
755 | * tree. | |
756 | */ | |
757 | ret = btrfs_search_slot(trans, root, &key, path, 0, 0); | |
758 | if (ret < 0) | |
759 | goto out; | |
760 | ||
ae01a0ab YZ |
761 | nritems = btrfs_header_nritems(path->nodes[0]); |
762 | if (path->slots[0] >= nritems) { | |
f46b5a66 CH |
763 | ret = btrfs_next_leaf(root, path); |
764 | if (ret < 0) | |
765 | goto out; | |
766 | if (ret > 0) | |
767 | break; | |
ae01a0ab | 768 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
769 | } |
770 | leaf = path->nodes[0]; | |
771 | slot = path->slots[0]; | |
f46b5a66 | 772 | |
ae01a0ab | 773 | btrfs_item_key_to_cpu(leaf, &key, slot); |
f46b5a66 CH |
774 | if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY || |
775 | key.objectid != src->i_ino) | |
776 | break; | |
777 | ||
c5c9cd4d SW |
778 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
779 | struct btrfs_file_extent_item *extent; | |
780 | int type; | |
31840ae1 ZY |
781 | u32 size; |
782 | struct btrfs_key new_key; | |
c5c9cd4d SW |
783 | u64 disko = 0, diskl = 0; |
784 | u64 datao = 0, datal = 0; | |
785 | u8 comp; | |
31840ae1 ZY |
786 | |
787 | size = btrfs_item_size_nr(leaf, slot); | |
788 | read_extent_buffer(leaf, buf, | |
789 | btrfs_item_ptr_offset(leaf, slot), | |
790 | size); | |
c5c9cd4d SW |
791 | |
792 | extent = btrfs_item_ptr(leaf, slot, | |
793 | struct btrfs_file_extent_item); | |
794 | comp = btrfs_file_extent_compression(leaf, extent); | |
795 | type = btrfs_file_extent_type(leaf, extent); | |
796 | if (type == BTRFS_FILE_EXTENT_REG) { | |
797 | disko = btrfs_file_extent_disk_bytenr(leaf, extent); | |
798 | diskl = btrfs_file_extent_disk_num_bytes(leaf, extent); | |
799 | datao = btrfs_file_extent_offset(leaf, extent); | |
800 | datal = btrfs_file_extent_num_bytes(leaf, extent); | |
801 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { | |
802 | /* take upper bound, may be compressed */ | |
803 | datal = btrfs_file_extent_ram_bytes(leaf, | |
804 | extent); | |
805 | } | |
31840ae1 ZY |
806 | btrfs_release_path(root, path); |
807 | ||
c5c9cd4d SW |
808 | if (key.offset + datal < off || |
809 | key.offset >= off+len) | |
810 | goto next; | |
811 | ||
31840ae1 ZY |
812 | memcpy(&new_key, &key, sizeof(new_key)); |
813 | new_key.objectid = inode->i_ino; | |
c5c9cd4d | 814 | new_key.offset = key.offset + destoff - off; |
31840ae1 | 815 | |
c5c9cd4d SW |
816 | if (type == BTRFS_FILE_EXTENT_REG) { |
817 | ret = btrfs_insert_empty_item(trans, root, path, | |
818 | &new_key, size); | |
819 | if (ret) | |
820 | goto out; | |
821 | ||
822 | leaf = path->nodes[0]; | |
823 | slot = path->slots[0]; | |
824 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
825 | btrfs_item_ptr_offset(leaf, slot), |
826 | size); | |
ae01a0ab | 827 | |
c5c9cd4d | 828 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 829 | struct btrfs_file_extent_item); |
c5c9cd4d SW |
830 | printk(" orig disk %llu~%llu data %llu~%llu\n", |
831 | disko, diskl, datao, datal); | |
832 | ||
833 | if (off > key.offset) { | |
834 | datao += off - key.offset; | |
835 | datal -= off - key.offset; | |
836 | } | |
837 | if (key.offset + datao + datal + key.offset > | |
838 | off + len) | |
839 | datal = off + len - key.offset - datao; | |
840 | /* disko == 0 means it's a hole */ | |
841 | if (!disko) | |
842 | datao = 0; | |
843 | printk(" final disk %llu~%llu data %llu~%llu\n", | |
844 | disko, diskl, datao, datal); | |
845 | ||
846 | btrfs_set_file_extent_offset(leaf, extent, | |
847 | datao); | |
848 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
849 | datal); | |
850 | if (disko) { | |
851 | inode_add_bytes(inode, datal); | |
ae01a0ab | 852 | ret = btrfs_inc_extent_ref(trans, root, |
c5c9cd4d SW |
853 | disko, diskl, leaf->start, |
854 | root->root_key.objectid, | |
855 | trans->transid, | |
856 | inode->i_ino); | |
31840ae1 | 857 | BUG_ON(ret); |
f46b5a66 | 858 | } |
c5c9cd4d SW |
859 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
860 | u64 skip = 0; | |
861 | u64 trim = 0; | |
862 | if (off > key.offset) { | |
863 | skip = off - key.offset; | |
864 | new_key.offset += skip; | |
865 | } | |
866 | if (key.offset + datal > off+len) | |
867 | trim = key.offset + datal - (off+len); | |
868 | printk("len %lld skip %lld trim %lld\n", | |
869 | datal, skip, trim); | |
870 | if (comp && (skip || trim)) { | |
871 | printk("btrfs clone_range can't split compressed inline extents yet\n"); | |
872 | ret = -EINVAL; | |
873 | goto out; | |
874 | } | |
875 | size -= skip + trim; | |
876 | datal -= skip + trim; | |
877 | ret = btrfs_insert_empty_item(trans, root, path, | |
878 | &new_key, size); | |
879 | if (ret) | |
880 | goto out; | |
881 | ||
882 | if (skip) { | |
883 | u32 start = btrfs_file_extent_calc_inline_size(0); | |
884 | memmove(buf+start, buf+start+skip, | |
885 | datal); | |
886 | } | |
887 | ||
888 | leaf = path->nodes[0]; | |
889 | slot = path->slots[0]; | |
890 | write_extent_buffer(leaf, buf, | |
891 | btrfs_item_ptr_offset(leaf, slot), | |
892 | size); | |
893 | inode_add_bytes(inode, datal); | |
f46b5a66 | 894 | } |
c5c9cd4d SW |
895 | |
896 | btrfs_mark_buffer_dirty(leaf); | |
ae01a0ab | 897 | } |
c5c9cd4d SW |
898 | |
899 | if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) { | |
900 | u32 size; | |
901 | struct btrfs_key new_key; | |
902 | u64 coverslen; | |
903 | int coff, clen; | |
904 | ||
905 | size = btrfs_item_size_nr(leaf, slot); | |
906 | coverslen = (size / BTRFS_CRC32_SIZE) << | |
907 | root->fs_info->sb->s_blocksize_bits; | |
908 | printk("csums for %llu~%llu\n", | |
909 | key.offset, coverslen); | |
910 | if (key.offset + coverslen < off || | |
911 | key.offset >= off+len) | |
912 | goto next; | |
913 | ||
914 | read_extent_buffer(leaf, buf, | |
915 | btrfs_item_ptr_offset(leaf, slot), | |
916 | size); | |
917 | btrfs_release_path(root, path); | |
918 | ||
919 | coff = 0; | |
920 | if (off > key.offset) | |
921 | coff = ((off - key.offset) >> | |
922 | root->fs_info->sb->s_blocksize_bits) * | |
923 | BTRFS_CRC32_SIZE; | |
924 | clen = size - coff; | |
925 | if (key.offset + coverslen > off+len) | |
926 | clen -= ((key.offset+coverslen-off-len) >> | |
927 | root->fs_info->sb->s_blocksize_bits) * | |
928 | BTRFS_CRC32_SIZE; | |
929 | printk(" will dup %d~%d of %d\n", | |
930 | coff, clen, size); | |
931 | ||
932 | memcpy(&new_key, &key, sizeof(new_key)); | |
933 | new_key.objectid = inode->i_ino; | |
934 | new_key.offset = key.offset + destoff - off; | |
935 | ||
936 | ret = btrfs_insert_empty_item(trans, root, path, | |
937 | &new_key, clen); | |
938 | if (ret) | |
939 | goto out; | |
940 | ||
941 | leaf = path->nodes[0]; | |
942 | slot = path->slots[0]; | |
943 | write_extent_buffer(leaf, buf + coff, | |
944 | btrfs_item_ptr_offset(leaf, slot), | |
945 | clen); | |
946 | btrfs_mark_buffer_dirty(leaf); | |
947 | } | |
948 | ||
949 | next: | |
31840ae1 | 950 | btrfs_release_path(root, path); |
f46b5a66 | 951 | key.offset++; |
f46b5a66 | 952 | } |
f46b5a66 CH |
953 | ret = 0; |
954 | out: | |
ae01a0ab YZ |
955 | btrfs_release_path(root, path); |
956 | if (ret == 0) { | |
957 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
c5c9cd4d SW |
958 | if (destoff + olen > inode->i_size) |
959 | btrfs_i_size_write(inode, destoff + olen); | |
ae01a0ab YZ |
960 | BTRFS_I(inode)->flags = BTRFS_I(src)->flags; |
961 | ret = btrfs_update_inode(trans, root, inode); | |
962 | } | |
f46b5a66 | 963 | btrfs_end_transaction(trans, root); |
c5c9cd4d | 964 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
ae01a0ab YZ |
965 | if (ret) |
966 | vmtruncate(inode, 0); | |
f46b5a66 CH |
967 | out_unlock: |
968 | mutex_unlock(&src->i_mutex); | |
969 | mutex_unlock(&inode->i_mutex); | |
ae01a0ab YZ |
970 | vfree(buf); |
971 | btrfs_free_path(path); | |
f46b5a66 CH |
972 | out_fput: |
973 | fput(src_file); | |
974 | return ret; | |
975 | } | |
976 | ||
c5c9cd4d SW |
977 | long btrfs_ioctl_clone_range(struct file *file, unsigned long argptr) |
978 | { | |
979 | struct btrfs_ioctl_clone_range_args args; | |
980 | ||
981 | if (copy_from_user(&args, (void *)argptr, sizeof(args))) | |
982 | return -EFAULT; | |
983 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, | |
984 | args.src_length, args.dest_offset); | |
985 | } | |
986 | ||
f46b5a66 CH |
987 | /* |
988 | * there are many ways the trans_start and trans_end ioctls can lead | |
989 | * to deadlocks. They should only be used by applications that | |
990 | * basically own the machine, and have a very in depth understanding | |
991 | * of all the possible deadlocks and enospc problems. | |
992 | */ | |
993 | long btrfs_ioctl_trans_start(struct file *file) | |
994 | { | |
995 | struct inode *inode = fdentry(file)->d_inode; | |
996 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
997 | struct btrfs_trans_handle *trans; | |
998 | int ret = 0; | |
999 | ||
df5b5520 CH |
1000 | if (!capable(CAP_SYS_ADMIN)) |
1001 | return -EPERM; | |
1002 | ||
f46b5a66 CH |
1003 | if (file->private_data) { |
1004 | ret = -EINPROGRESS; | |
1005 | goto out; | |
1006 | } | |
9ca9ee09 | 1007 | |
c146afad YZ |
1008 | ret = mnt_want_write(file->f_path.mnt); |
1009 | if (ret) | |
1010 | goto out; | |
1011 | ||
9ca9ee09 SW |
1012 | mutex_lock(&root->fs_info->trans_mutex); |
1013 | root->fs_info->open_ioctl_trans++; | |
1014 | mutex_unlock(&root->fs_info->trans_mutex); | |
1015 | ||
1016 | trans = btrfs_start_ioctl_transaction(root, 0); | |
f46b5a66 CH |
1017 | if (trans) |
1018 | file->private_data = trans; | |
1019 | else | |
1020 | ret = -ENOMEM; | |
1021 | /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/ | |
1022 | out: | |
f46b5a66 CH |
1023 | return ret; |
1024 | } | |
1025 | ||
1026 | /* | |
1027 | * there are many ways the trans_start and trans_end ioctls can lead | |
1028 | * to deadlocks. They should only be used by applications that | |
1029 | * basically own the machine, and have a very in depth understanding | |
1030 | * of all the possible deadlocks and enospc problems. | |
1031 | */ | |
1032 | long btrfs_ioctl_trans_end(struct file *file) | |
1033 | { | |
1034 | struct inode *inode = fdentry(file)->d_inode; | |
1035 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1036 | struct btrfs_trans_handle *trans; | |
1037 | int ret = 0; | |
1038 | ||
f46b5a66 CH |
1039 | trans = file->private_data; |
1040 | if (!trans) { | |
1041 | ret = -EINVAL; | |
1042 | goto out; | |
1043 | } | |
1044 | btrfs_end_transaction(trans, root); | |
b214107e | 1045 | file->private_data = NULL; |
9ca9ee09 SW |
1046 | |
1047 | mutex_lock(&root->fs_info->trans_mutex); | |
1048 | root->fs_info->open_ioctl_trans--; | |
1049 | mutex_unlock(&root->fs_info->trans_mutex); | |
1050 | ||
f46b5a66 | 1051 | out: |
f46b5a66 CH |
1052 | return ret; |
1053 | } | |
1054 | ||
1055 | long btrfs_ioctl(struct file *file, unsigned int | |
1056 | cmd, unsigned long arg) | |
1057 | { | |
1058 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; | |
1059 | ||
1060 | switch (cmd) { | |
1061 | case BTRFS_IOC_SNAP_CREATE: | |
3de4586c CM |
1062 | return btrfs_ioctl_snap_create(file, (void __user *)arg, 0); |
1063 | case BTRFS_IOC_SUBVOL_CREATE: | |
1064 | return btrfs_ioctl_snap_create(file, (void __user *)arg, 1); | |
f46b5a66 CH |
1065 | case BTRFS_IOC_DEFRAG: |
1066 | return btrfs_ioctl_defrag(file); | |
1067 | case BTRFS_IOC_RESIZE: | |
1068 | return btrfs_ioctl_resize(root, (void __user *)arg); | |
1069 | case BTRFS_IOC_ADD_DEV: | |
1070 | return btrfs_ioctl_add_dev(root, (void __user *)arg); | |
1071 | case BTRFS_IOC_RM_DEV: | |
1072 | return btrfs_ioctl_rm_dev(root, (void __user *)arg); | |
1073 | case BTRFS_IOC_BALANCE: | |
1074 | return btrfs_balance(root->fs_info->dev_root); | |
1075 | case BTRFS_IOC_CLONE: | |
c5c9cd4d SW |
1076 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
1077 | case BTRFS_IOC_CLONE_RANGE: | |
1078 | return btrfs_ioctl_clone_range(file, arg); | |
f46b5a66 CH |
1079 | case BTRFS_IOC_TRANS_START: |
1080 | return btrfs_ioctl_trans_start(file); | |
1081 | case BTRFS_IOC_TRANS_END: | |
1082 | return btrfs_ioctl_trans_end(file); | |
1083 | case BTRFS_IOC_SYNC: | |
ea8c2819 | 1084 | btrfs_start_delalloc_inodes(root); |
f46b5a66 CH |
1085 | btrfs_sync_fs(file->f_dentry->d_sb, 1); |
1086 | return 0; | |
1087 | } | |
1088 | ||
1089 | return -ENOTTY; | |
1090 | } |