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 CM |
149 | |
150 | /* add the backref first */ | |
151 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, | |
152 | objectid, BTRFS_ROOT_BACKREF_KEY, | |
153 | root->root_key.objectid, | |
154 | dir->i_ino, index, name, namelen); | |
155 | ||
156 | BUG_ON(ret); | |
157 | ||
158 | /* now add the forward ref */ | |
159 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, | |
160 | root->root_key.objectid, BTRFS_ROOT_REF_KEY, | |
161 | objectid, | |
162 | dir->i_ino, index, name, namelen); | |
163 | ||
164 | BUG_ON(ret); | |
165 | ||
f46b5a66 CH |
166 | ret = btrfs_commit_transaction(trans, root); |
167 | if (ret) | |
168 | goto fail_commit; | |
169 | ||
3de4586c | 170 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); |
f46b5a66 CH |
171 | BUG_ON(!new_root); |
172 | ||
173 | trans = btrfs_start_transaction(new_root, 1); | |
174 | BUG_ON(!trans); | |
175 | ||
cb8e7090 | 176 | ret = btrfs_create_subvol_root(new_root, dentry, trans, new_dirid, |
f46b5a66 CH |
177 | BTRFS_I(dir)->block_group); |
178 | if (ret) | |
179 | goto fail; | |
180 | ||
f46b5a66 CH |
181 | fail: |
182 | nr = trans->blocks_used; | |
183 | err = btrfs_commit_transaction(trans, new_root); | |
184 | if (err && !ret) | |
185 | ret = err; | |
186 | fail_commit: | |
f46b5a66 | 187 | btrfs_btree_balance_dirty(root, nr); |
f46b5a66 CH |
188 | return ret; |
189 | } | |
190 | ||
3de4586c CM |
191 | static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, |
192 | char *name, int namelen) | |
f46b5a66 CH |
193 | { |
194 | struct btrfs_pending_snapshot *pending_snapshot; | |
195 | struct btrfs_trans_handle *trans; | |
3de4586c | 196 | int ret = 0; |
f46b5a66 CH |
197 | int err; |
198 | unsigned long nr = 0; | |
199 | ||
200 | if (!root->ref_cows) | |
201 | return -EINVAL; | |
202 | ||
f46b5a66 CH |
203 | ret = btrfs_check_free_space(root, 1, 0); |
204 | if (ret) | |
205 | goto fail_unlock; | |
206 | ||
3de4586c | 207 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
f46b5a66 CH |
208 | if (!pending_snapshot) { |
209 | ret = -ENOMEM; | |
210 | goto fail_unlock; | |
211 | } | |
212 | pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); | |
213 | if (!pending_snapshot->name) { | |
214 | ret = -ENOMEM; | |
215 | kfree(pending_snapshot); | |
216 | goto fail_unlock; | |
217 | } | |
218 | memcpy(pending_snapshot->name, name, namelen); | |
219 | pending_snapshot->name[namelen] = '\0'; | |
3de4586c | 220 | pending_snapshot->dentry = dentry; |
f46b5a66 CH |
221 | trans = btrfs_start_transaction(root, 1); |
222 | BUG_ON(!trans); | |
223 | pending_snapshot->root = root; | |
224 | list_add(&pending_snapshot->list, | |
225 | &trans->transaction->pending_snapshots); | |
f46b5a66 CH |
226 | err = btrfs_commit_transaction(trans, root); |
227 | ||
228 | fail_unlock: | |
f46b5a66 | 229 | btrfs_btree_balance_dirty(root, nr); |
f46b5a66 CH |
230 | return ret; |
231 | } | |
232 | ||
cb8e7090 CH |
233 | /* copy of may_create in fs/namei.c() */ |
234 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
235 | { | |
236 | if (child->d_inode) | |
237 | return -EEXIST; | |
238 | if (IS_DEADDIR(dir)) | |
239 | return -ENOENT; | |
240 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
241 | } | |
242 | ||
243 | /* | |
244 | * Create a new subvolume below @parent. This is largely modeled after | |
245 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
246 | * inside this filesystem so it's quite a bit simpler. | |
247 | */ | |
248 | static noinline int btrfs_mksubvol(struct path *parent, char *name, | |
3de4586c CM |
249 | int mode, int namelen, |
250 | struct btrfs_root *snap_src) | |
cb8e7090 CH |
251 | { |
252 | struct dentry *dentry; | |
253 | int error; | |
254 | ||
255 | mutex_lock_nested(&parent->dentry->d_inode->i_mutex, I_MUTEX_PARENT); | |
256 | ||
257 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
258 | error = PTR_ERR(dentry); | |
259 | if (IS_ERR(dentry)) | |
260 | goto out_unlock; | |
261 | ||
262 | error = -EEXIST; | |
263 | if (dentry->d_inode) | |
264 | goto out_dput; | |
265 | ||
266 | if (!IS_POSIXACL(parent->dentry->d_inode)) | |
267 | mode &= ~current->fs->umask; | |
3de4586c | 268 | |
cb8e7090 CH |
269 | error = mnt_want_write(parent->mnt); |
270 | if (error) | |
271 | goto out_dput; | |
272 | ||
273 | error = btrfs_may_create(parent->dentry->d_inode, dentry); | |
274 | if (error) | |
275 | goto out_drop_write; | |
276 | ||
cb8e7090 CH |
277 | /* |
278 | * Actually perform the low-level subvolume creation after all | |
279 | * this VFS fuzz. | |
280 | * | |
281 | * Eventually we want to pass in an inode under which we create this | |
282 | * subvolume, but for now all are under the filesystem root. | |
283 | * | |
284 | * Also we should pass on the mode eventually to allow creating new | |
285 | * subvolume with specific mode bits. | |
286 | */ | |
3de4586c | 287 | if (snap_src) { |
ea9e8b11 CM |
288 | struct dentry *dir = dentry->d_parent; |
289 | struct dentry *test = dir->d_parent; | |
290 | struct btrfs_path *path = btrfs_alloc_path(); | |
291 | int ret; | |
292 | u64 test_oid; | |
293 | u64 parent_oid = BTRFS_I(dir->d_inode)->root->root_key.objectid; | |
294 | ||
295 | test_oid = snap_src->root_key.objectid; | |
296 | ||
297 | ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, | |
298 | path, parent_oid, test_oid); | |
299 | if (ret == 0) | |
300 | goto create; | |
301 | btrfs_release_path(snap_src->fs_info->tree_root, path); | |
302 | ||
303 | /* we need to make sure we aren't creating a directory loop | |
304 | * by taking a snapshot of something that has our current | |
305 | * subvol in its directory tree. So, this loops through | |
306 | * the dentries and checks the forward refs for each subvolume | |
307 | * to see if is references the subvolume where we are | |
308 | * placing this new snapshot. | |
309 | */ | |
310 | while(1) { | |
311 | if (!test || | |
312 | dir == snap_src->fs_info->sb->s_root || | |
313 | test == snap_src->fs_info->sb->s_root || | |
314 | test->d_inode->i_sb != snap_src->fs_info->sb) { | |
315 | break; | |
316 | } | |
317 | if (S_ISLNK(test->d_inode->i_mode)) { | |
318 | printk("Symlink in snapshot path, failed\n"); | |
319 | error = -EMLINK; | |
320 | btrfs_free_path(path); | |
321 | goto out_drop_write; | |
322 | } | |
323 | test_oid = | |
324 | BTRFS_I(test->d_inode)->root->root_key.objectid; | |
325 | ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, | |
326 | path, test_oid, parent_oid); | |
327 | if (ret == 0) { | |
328 | printk("Snapshot creation failed, looping\n"); | |
329 | error = -EMLINK; | |
330 | btrfs_free_path(path); | |
331 | goto out_drop_write; | |
332 | } | |
333 | btrfs_release_path(snap_src->fs_info->tree_root, path); | |
334 | test = test->d_parent; | |
335 | } | |
336 | create: | |
337 | btrfs_free_path(path); | |
3de4586c CM |
338 | error = create_snapshot(snap_src, dentry, name, namelen); |
339 | } else { | |
340 | error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root, | |
341 | dentry, name, namelen); | |
342 | } | |
cb8e7090 CH |
343 | if (error) |
344 | goto out_drop_write; | |
345 | ||
346 | fsnotify_mkdir(parent->dentry->d_inode, dentry); | |
347 | out_drop_write: | |
348 | mnt_drop_write(parent->mnt); | |
349 | out_dput: | |
350 | dput(dentry); | |
351 | out_unlock: | |
352 | mutex_unlock(&parent->dentry->d_inode->i_mutex); | |
353 | return error; | |
354 | } | |
355 | ||
356 | ||
b2950863 | 357 | static int btrfs_defrag_file(struct file *file) |
f46b5a66 CH |
358 | { |
359 | struct inode *inode = fdentry(file)->d_inode; | |
360 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
361 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
3eaa2885 | 362 | struct btrfs_ordered_extent *ordered; |
f46b5a66 CH |
363 | struct page *page; |
364 | unsigned long last_index; | |
365 | unsigned long ra_pages = root->fs_info->bdi.ra_pages; | |
366 | unsigned long total_read = 0; | |
367 | u64 page_start; | |
368 | u64 page_end; | |
369 | unsigned long i; | |
370 | int ret; | |
371 | ||
f46b5a66 | 372 | ret = btrfs_check_free_space(root, inode->i_size, 0); |
f46b5a66 CH |
373 | if (ret) |
374 | return -ENOSPC; | |
375 | ||
376 | mutex_lock(&inode->i_mutex); | |
377 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
378 | for (i = 0; i <= last_index; i++) { | |
379 | if (total_read % ra_pages == 0) { | |
380 | btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, | |
381 | min(last_index, i + ra_pages - 1)); | |
382 | } | |
383 | total_read++; | |
3eaa2885 | 384 | again: |
f46b5a66 CH |
385 | page = grab_cache_page(inode->i_mapping, i); |
386 | if (!page) | |
387 | goto out_unlock; | |
388 | if (!PageUptodate(page)) { | |
389 | btrfs_readpage(NULL, page); | |
390 | lock_page(page); | |
391 | if (!PageUptodate(page)) { | |
392 | unlock_page(page); | |
393 | page_cache_release(page); | |
394 | goto out_unlock; | |
395 | } | |
396 | } | |
397 | ||
f46b5a66 | 398 | wait_on_page_writeback(page); |
f46b5a66 CH |
399 | |
400 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; | |
401 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
f46b5a66 | 402 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
3eaa2885 CM |
403 | |
404 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
405 | if (ordered) { | |
406 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
407 | unlock_page(page); | |
408 | page_cache_release(page); | |
409 | btrfs_start_ordered_extent(inode, ordered, 1); | |
410 | btrfs_put_ordered_extent(ordered); | |
411 | goto again; | |
412 | } | |
413 | set_page_extent_mapped(page); | |
414 | ||
f87f057b CM |
415 | /* |
416 | * this makes sure page_mkwrite is called on the | |
417 | * page if it is dirtied again later | |
418 | */ | |
419 | clear_page_dirty_for_io(page); | |
420 | ||
ea8c2819 | 421 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
f46b5a66 CH |
422 | |
423 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
424 | set_page_dirty(page); | |
425 | unlock_page(page); | |
426 | page_cache_release(page); | |
427 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
428 | } | |
429 | ||
430 | out_unlock: | |
431 | mutex_unlock(&inode->i_mutex); | |
432 | return 0; | |
433 | } | |
434 | ||
435 | /* | |
436 | * Called inside transaction, so use GFP_NOFS | |
437 | */ | |
438 | ||
439 | static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) | |
440 | { | |
441 | u64 new_size; | |
442 | u64 old_size; | |
443 | u64 devid = 1; | |
444 | struct btrfs_ioctl_vol_args *vol_args; | |
445 | struct btrfs_trans_handle *trans; | |
446 | struct btrfs_device *device = NULL; | |
447 | char *sizestr; | |
448 | char *devstr = NULL; | |
449 | int ret = 0; | |
450 | int namelen; | |
451 | int mod = 0; | |
452 | ||
c146afad YZ |
453 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
454 | return -EROFS; | |
455 | ||
f46b5a66 CH |
456 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
457 | ||
458 | if (!vol_args) | |
459 | return -ENOMEM; | |
460 | ||
461 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
462 | ret = -EFAULT; | |
463 | goto out; | |
464 | } | |
5516e595 MF |
465 | |
466 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 467 | namelen = strlen(vol_args->name); |
f46b5a66 | 468 | |
7d9eb12c | 469 | mutex_lock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
470 | sizestr = vol_args->name; |
471 | devstr = strchr(sizestr, ':'); | |
472 | if (devstr) { | |
473 | char *end; | |
474 | sizestr = devstr + 1; | |
475 | *devstr = '\0'; | |
476 | devstr = vol_args->name; | |
477 | devid = simple_strtoull(devstr, &end, 10); | |
478 | printk(KERN_INFO "resizing devid %llu\n", devid); | |
479 | } | |
2b82032c | 480 | device = btrfs_find_device(root, devid, NULL, NULL); |
f46b5a66 CH |
481 | if (!device) { |
482 | printk(KERN_INFO "resizer unable to find device %llu\n", devid); | |
483 | ret = -EINVAL; | |
484 | goto out_unlock; | |
485 | } | |
486 | if (!strcmp(sizestr, "max")) | |
487 | new_size = device->bdev->bd_inode->i_size; | |
488 | else { | |
489 | if (sizestr[0] == '-') { | |
490 | mod = -1; | |
491 | sizestr++; | |
492 | } else if (sizestr[0] == '+') { | |
493 | mod = 1; | |
494 | sizestr++; | |
495 | } | |
496 | new_size = btrfs_parse_size(sizestr); | |
497 | if (new_size == 0) { | |
498 | ret = -EINVAL; | |
499 | goto out_unlock; | |
500 | } | |
501 | } | |
502 | ||
503 | old_size = device->total_bytes; | |
504 | ||
505 | if (mod < 0) { | |
506 | if (new_size > old_size) { | |
507 | ret = -EINVAL; | |
508 | goto out_unlock; | |
509 | } | |
510 | new_size = old_size - new_size; | |
511 | } else if (mod > 0) { | |
512 | new_size = old_size + new_size; | |
513 | } | |
514 | ||
515 | if (new_size < 256 * 1024 * 1024) { | |
516 | ret = -EINVAL; | |
517 | goto out_unlock; | |
518 | } | |
519 | if (new_size > device->bdev->bd_inode->i_size) { | |
520 | ret = -EFBIG; | |
521 | goto out_unlock; | |
522 | } | |
523 | ||
524 | do_div(new_size, root->sectorsize); | |
525 | new_size *= root->sectorsize; | |
526 | ||
527 | printk(KERN_INFO "new size for %s is %llu\n", | |
528 | device->name, (unsigned long long)new_size); | |
529 | ||
530 | if (new_size > old_size) { | |
531 | trans = btrfs_start_transaction(root, 1); | |
532 | ret = btrfs_grow_device(trans, device, new_size); | |
533 | btrfs_commit_transaction(trans, root); | |
534 | } else { | |
535 | ret = btrfs_shrink_device(device, new_size); | |
536 | } | |
537 | ||
538 | out_unlock: | |
7d9eb12c | 539 | mutex_unlock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
540 | out: |
541 | kfree(vol_args); | |
542 | return ret; | |
543 | } | |
544 | ||
cb8e7090 | 545 | static noinline int btrfs_ioctl_snap_create(struct file *file, |
3de4586c | 546 | void __user *arg, int subvol) |
f46b5a66 | 547 | { |
cb8e7090 | 548 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
f46b5a66 CH |
549 | struct btrfs_ioctl_vol_args *vol_args; |
550 | struct btrfs_dir_item *di; | |
551 | struct btrfs_path *path; | |
3de4586c | 552 | struct file *src_file; |
f46b5a66 CH |
553 | u64 root_dirid; |
554 | int namelen; | |
3de4586c | 555 | int ret = 0; |
f46b5a66 | 556 | |
c146afad YZ |
557 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
558 | return -EROFS; | |
559 | ||
f46b5a66 CH |
560 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
561 | ||
562 | if (!vol_args) | |
563 | return -ENOMEM; | |
564 | ||
565 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
566 | ret = -EFAULT; | |
567 | goto out; | |
568 | } | |
569 | ||
5516e595 | 570 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 | 571 | namelen = strlen(vol_args->name); |
f46b5a66 CH |
572 | if (strchr(vol_args->name, '/')) { |
573 | ret = -EINVAL; | |
574 | goto out; | |
575 | } | |
576 | ||
577 | path = btrfs_alloc_path(); | |
578 | if (!path) { | |
579 | ret = -ENOMEM; | |
580 | goto out; | |
581 | } | |
582 | ||
583 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
f46b5a66 CH |
584 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, |
585 | path, root_dirid, | |
586 | vol_args->name, namelen, 0); | |
f46b5a66 CH |
587 | btrfs_free_path(path); |
588 | ||
589 | if (di && !IS_ERR(di)) { | |
590 | ret = -EEXIST; | |
591 | goto out; | |
592 | } | |
593 | ||
594 | if (IS_ERR(di)) { | |
595 | ret = PTR_ERR(di); | |
596 | goto out; | |
597 | } | |
598 | ||
3de4586c | 599 | if (subvol) { |
cb8e7090 CH |
600 | ret = btrfs_mksubvol(&file->f_path, vol_args->name, |
601 | file->f_path.dentry->d_inode->i_mode, | |
3de4586c | 602 | namelen, NULL); |
cb8e7090 | 603 | } else { |
3de4586c CM |
604 | struct inode *src_inode; |
605 | src_file = fget(vol_args->fd); | |
606 | if (!src_file) { | |
607 | ret = -EINVAL; | |
608 | goto out; | |
609 | } | |
610 | ||
611 | src_inode = src_file->f_path.dentry->d_inode; | |
612 | if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { | |
613 | printk("btrfs: Snapshot src from another FS\n"); | |
614 | ret = -EINVAL; | |
615 | fput(src_file); | |
616 | goto out; | |
617 | } | |
618 | ret = btrfs_mksubvol(&file->f_path, vol_args->name, | |
619 | file->f_path.dentry->d_inode->i_mode, | |
620 | namelen, BTRFS_I(src_inode)->root); | |
621 | fput(src_file); | |
cb8e7090 CH |
622 | } |
623 | ||
f46b5a66 CH |
624 | out: |
625 | kfree(vol_args); | |
626 | return ret; | |
627 | } | |
628 | ||
629 | static int btrfs_ioctl_defrag(struct file *file) | |
630 | { | |
631 | struct inode *inode = fdentry(file)->d_inode; | |
632 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
c146afad YZ |
633 | int ret; |
634 | ||
635 | ret = mnt_want_write(file->f_path.mnt); | |
636 | if (ret) | |
637 | return ret; | |
f46b5a66 CH |
638 | |
639 | switch (inode->i_mode & S_IFMT) { | |
640 | case S_IFDIR: | |
f46b5a66 CH |
641 | btrfs_defrag_root(root, 0); |
642 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
f46b5a66 CH |
643 | break; |
644 | case S_IFREG: | |
645 | btrfs_defrag_file(file); | |
646 | break; | |
647 | } | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
b2950863 | 652 | static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
653 | { |
654 | struct btrfs_ioctl_vol_args *vol_args; | |
655 | int ret; | |
656 | ||
657 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); | |
658 | ||
659 | if (!vol_args) | |
660 | return -ENOMEM; | |
661 | ||
662 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
663 | ret = -EFAULT; | |
664 | goto out; | |
665 | } | |
5516e595 | 666 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
667 | ret = btrfs_init_new_device(root, vol_args->name); |
668 | ||
669 | out: | |
670 | kfree(vol_args); | |
671 | return ret; | |
672 | } | |
673 | ||
b2950863 | 674 | static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
675 | { |
676 | struct btrfs_ioctl_vol_args *vol_args; | |
677 | int ret; | |
678 | ||
c146afad YZ |
679 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
680 | return -EROFS; | |
681 | ||
f46b5a66 CH |
682 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
683 | ||
684 | if (!vol_args) | |
685 | return -ENOMEM; | |
686 | ||
687 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
688 | ret = -EFAULT; | |
689 | goto out; | |
690 | } | |
5516e595 | 691 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
692 | ret = btrfs_rm_device(root, vol_args->name); |
693 | ||
694 | out: | |
695 | kfree(vol_args); | |
696 | return ret; | |
697 | } | |
698 | ||
b2950863 CH |
699 | static long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, |
700 | u64 off, u64 olen, u64 destoff) | |
f46b5a66 CH |
701 | { |
702 | struct inode *inode = fdentry(file)->d_inode; | |
703 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
704 | struct file *src_file; | |
705 | struct inode *src; | |
706 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 707 | struct btrfs_path *path; |
f46b5a66 | 708 | struct extent_buffer *leaf; |
ae01a0ab YZ |
709 | char *buf; |
710 | struct btrfs_key key; | |
f46b5a66 CH |
711 | u32 nritems; |
712 | int slot; | |
ae01a0ab | 713 | int ret; |
c5c9cd4d SW |
714 | u64 len = olen; |
715 | u64 bs = root->fs_info->sb->s_blocksize; | |
716 | u64 hint_byte; | |
607d432d JB |
717 | u16 csum_size = |
718 | btrfs_super_csum_size(&root->fs_info->super_copy); | |
c5c9cd4d SW |
719 | /* |
720 | * TODO: | |
721 | * - split compressed inline extents. annoying: we need to | |
722 | * decompress into destination's address_space (the file offset | |
723 | * may change, so source mapping won't do), then recompress (or | |
724 | * otherwise reinsert) a subrange. | |
725 | * - allow ranges within the same file to be cloned (provided | |
726 | * they don't overlap)? | |
727 | */ | |
728 | ||
c146afad YZ |
729 | ret = mnt_want_write(file->f_path.mnt); |
730 | if (ret) | |
731 | return ret; | |
732 | ||
c5c9cd4d | 733 | src_file = fget(srcfd); |
f46b5a66 CH |
734 | if (!src_file) |
735 | return -EBADF; | |
736 | src = src_file->f_dentry->d_inode; | |
737 | ||
c5c9cd4d SW |
738 | ret = -EINVAL; |
739 | if (src == inode) | |
740 | goto out_fput; | |
741 | ||
ae01a0ab YZ |
742 | ret = -EISDIR; |
743 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) | |
744 | goto out_fput; | |
745 | ||
f46b5a66 | 746 | ret = -EXDEV; |
ae01a0ab YZ |
747 | if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) |
748 | goto out_fput; | |
749 | ||
750 | ret = -ENOMEM; | |
751 | buf = vmalloc(btrfs_level_size(root, 0)); | |
752 | if (!buf) | |
753 | goto out_fput; | |
754 | ||
755 | path = btrfs_alloc_path(); | |
756 | if (!path) { | |
757 | vfree(buf); | |
f46b5a66 | 758 | goto out_fput; |
ae01a0ab YZ |
759 | } |
760 | path->reada = 2; | |
f46b5a66 CH |
761 | |
762 | if (inode < src) { | |
763 | mutex_lock(&inode->i_mutex); | |
764 | mutex_lock(&src->i_mutex); | |
765 | } else { | |
766 | mutex_lock(&src->i_mutex); | |
767 | mutex_lock(&inode->i_mutex); | |
768 | } | |
769 | ||
c5c9cd4d SW |
770 | /* determine range to clone */ |
771 | ret = -EINVAL; | |
772 | if (off >= src->i_size || off + len > src->i_size) | |
f46b5a66 | 773 | goto out_unlock; |
c5c9cd4d SW |
774 | if (len == 0) |
775 | olen = len = src->i_size - off; | |
776 | /* if we extend to eof, continue to block boundary */ | |
777 | if (off + len == src->i_size) | |
778 | len = ((src->i_size + bs-1) & ~(bs-1)) | |
779 | - off; | |
780 | ||
781 | /* verify the end result is block aligned */ | |
782 | if ((off & (bs-1)) || | |
783 | ((off + len) & (bs-1))) | |
784 | goto out_unlock; | |
785 | ||
786 | printk("final src extent is %llu~%llu\n", off, len); | |
787 | printk("final dst extent is %llu~%llu\n", destoff, len); | |
f46b5a66 CH |
788 | |
789 | /* do any pending delalloc/csum calc on src, one way or | |
790 | another, and lock file content */ | |
791 | while (1) { | |
31840ae1 | 792 | struct btrfs_ordered_extent *ordered; |
c5c9cd4d SW |
793 | lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
794 | ordered = btrfs_lookup_first_ordered_extent(inode, off+len); | |
ae01a0ab | 795 | if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) |
f46b5a66 | 796 | break; |
c5c9cd4d | 797 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
ae01a0ab YZ |
798 | if (ordered) |
799 | btrfs_put_ordered_extent(ordered); | |
c5c9cd4d | 800 | btrfs_wait_ordered_range(src, off, off+len); |
f46b5a66 CH |
801 | } |
802 | ||
ae01a0ab YZ |
803 | trans = btrfs_start_transaction(root, 1); |
804 | BUG_ON(!trans); | |
805 | ||
c5c9cd4d SW |
806 | /* punch hole in destination first */ |
807 | btrfs_drop_extents(trans, root, inode, off, off+len, 0, &hint_byte); | |
808 | ||
809 | /* clone data */ | |
f46b5a66 | 810 | key.objectid = src->i_ino; |
ae01a0ab YZ |
811 | key.type = BTRFS_EXTENT_DATA_KEY; |
812 | key.offset = 0; | |
f46b5a66 CH |
813 | |
814 | while (1) { | |
815 | /* | |
816 | * note the key will change type as we walk through the | |
817 | * tree. | |
818 | */ | |
819 | ret = btrfs_search_slot(trans, root, &key, path, 0, 0); | |
820 | if (ret < 0) | |
821 | goto out; | |
822 | ||
ae01a0ab YZ |
823 | nritems = btrfs_header_nritems(path->nodes[0]); |
824 | if (path->slots[0] >= nritems) { | |
f46b5a66 CH |
825 | ret = btrfs_next_leaf(root, path); |
826 | if (ret < 0) | |
827 | goto out; | |
828 | if (ret > 0) | |
829 | break; | |
ae01a0ab | 830 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
831 | } |
832 | leaf = path->nodes[0]; | |
833 | slot = path->slots[0]; | |
f46b5a66 | 834 | |
ae01a0ab | 835 | btrfs_item_key_to_cpu(leaf, &key, slot); |
f46b5a66 CH |
836 | if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY || |
837 | key.objectid != src->i_ino) | |
838 | break; | |
839 | ||
c5c9cd4d SW |
840 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
841 | struct btrfs_file_extent_item *extent; | |
842 | int type; | |
31840ae1 ZY |
843 | u32 size; |
844 | struct btrfs_key new_key; | |
c5c9cd4d SW |
845 | u64 disko = 0, diskl = 0; |
846 | u64 datao = 0, datal = 0; | |
847 | u8 comp; | |
31840ae1 ZY |
848 | |
849 | size = btrfs_item_size_nr(leaf, slot); | |
850 | read_extent_buffer(leaf, buf, | |
851 | btrfs_item_ptr_offset(leaf, slot), | |
852 | size); | |
c5c9cd4d SW |
853 | |
854 | extent = btrfs_item_ptr(leaf, slot, | |
855 | struct btrfs_file_extent_item); | |
856 | comp = btrfs_file_extent_compression(leaf, extent); | |
857 | type = btrfs_file_extent_type(leaf, extent); | |
858 | if (type == BTRFS_FILE_EXTENT_REG) { | |
859 | disko = btrfs_file_extent_disk_bytenr(leaf, extent); | |
860 | diskl = btrfs_file_extent_disk_num_bytes(leaf, extent); | |
861 | datao = btrfs_file_extent_offset(leaf, extent); | |
862 | datal = btrfs_file_extent_num_bytes(leaf, extent); | |
863 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { | |
864 | /* take upper bound, may be compressed */ | |
865 | datal = btrfs_file_extent_ram_bytes(leaf, | |
866 | extent); | |
867 | } | |
31840ae1 ZY |
868 | btrfs_release_path(root, path); |
869 | ||
c5c9cd4d SW |
870 | if (key.offset + datal < off || |
871 | key.offset >= off+len) | |
872 | goto next; | |
873 | ||
31840ae1 ZY |
874 | memcpy(&new_key, &key, sizeof(new_key)); |
875 | new_key.objectid = inode->i_ino; | |
c5c9cd4d | 876 | new_key.offset = key.offset + destoff - off; |
31840ae1 | 877 | |
c5c9cd4d SW |
878 | if (type == BTRFS_FILE_EXTENT_REG) { |
879 | ret = btrfs_insert_empty_item(trans, root, path, | |
880 | &new_key, size); | |
881 | if (ret) | |
882 | goto out; | |
883 | ||
884 | leaf = path->nodes[0]; | |
885 | slot = path->slots[0]; | |
886 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
887 | btrfs_item_ptr_offset(leaf, slot), |
888 | size); | |
ae01a0ab | 889 | |
c5c9cd4d | 890 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 891 | struct btrfs_file_extent_item); |
c5c9cd4d SW |
892 | printk(" orig disk %llu~%llu data %llu~%llu\n", |
893 | disko, diskl, datao, datal); | |
894 | ||
895 | if (off > key.offset) { | |
896 | datao += off - key.offset; | |
897 | datal -= off - key.offset; | |
898 | } | |
899 | if (key.offset + datao + datal + key.offset > | |
900 | off + len) | |
901 | datal = off + len - key.offset - datao; | |
902 | /* disko == 0 means it's a hole */ | |
903 | if (!disko) | |
904 | datao = 0; | |
905 | printk(" final disk %llu~%llu data %llu~%llu\n", | |
906 | disko, diskl, datao, datal); | |
907 | ||
908 | btrfs_set_file_extent_offset(leaf, extent, | |
909 | datao); | |
910 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
911 | datal); | |
912 | if (disko) { | |
913 | inode_add_bytes(inode, datal); | |
ae01a0ab | 914 | ret = btrfs_inc_extent_ref(trans, root, |
c5c9cd4d SW |
915 | disko, diskl, leaf->start, |
916 | root->root_key.objectid, | |
917 | trans->transid, | |
918 | inode->i_ino); | |
31840ae1 | 919 | BUG_ON(ret); |
f46b5a66 | 920 | } |
c5c9cd4d SW |
921 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
922 | u64 skip = 0; | |
923 | u64 trim = 0; | |
924 | if (off > key.offset) { | |
925 | skip = off - key.offset; | |
926 | new_key.offset += skip; | |
927 | } | |
928 | if (key.offset + datal > off+len) | |
929 | trim = key.offset + datal - (off+len); | |
930 | printk("len %lld skip %lld trim %lld\n", | |
931 | datal, skip, trim); | |
932 | if (comp && (skip || trim)) { | |
933 | printk("btrfs clone_range can't split compressed inline extents yet\n"); | |
934 | ret = -EINVAL; | |
935 | goto out; | |
936 | } | |
937 | size -= skip + trim; | |
938 | datal -= skip + trim; | |
939 | ret = btrfs_insert_empty_item(trans, root, path, | |
940 | &new_key, size); | |
941 | if (ret) | |
942 | goto out; | |
943 | ||
944 | if (skip) { | |
945 | u32 start = btrfs_file_extent_calc_inline_size(0); | |
946 | memmove(buf+start, buf+start+skip, | |
947 | datal); | |
948 | } | |
949 | ||
950 | leaf = path->nodes[0]; | |
951 | slot = path->slots[0]; | |
952 | write_extent_buffer(leaf, buf, | |
953 | btrfs_item_ptr_offset(leaf, slot), | |
954 | size); | |
955 | inode_add_bytes(inode, datal); | |
f46b5a66 | 956 | } |
c5c9cd4d SW |
957 | |
958 | btrfs_mark_buffer_dirty(leaf); | |
ae01a0ab | 959 | } |
c5c9cd4d SW |
960 | |
961 | if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) { | |
962 | u32 size; | |
963 | struct btrfs_key new_key; | |
964 | u64 coverslen; | |
965 | int coff, clen; | |
966 | ||
967 | size = btrfs_item_size_nr(leaf, slot); | |
607d432d | 968 | coverslen = (size / csum_size) << |
c5c9cd4d SW |
969 | root->fs_info->sb->s_blocksize_bits; |
970 | printk("csums for %llu~%llu\n", | |
971 | key.offset, coverslen); | |
972 | if (key.offset + coverslen < off || | |
973 | key.offset >= off+len) | |
974 | goto next; | |
975 | ||
976 | read_extent_buffer(leaf, buf, | |
977 | btrfs_item_ptr_offset(leaf, slot), | |
978 | size); | |
979 | btrfs_release_path(root, path); | |
980 | ||
981 | coff = 0; | |
982 | if (off > key.offset) | |
983 | coff = ((off - key.offset) >> | |
984 | root->fs_info->sb->s_blocksize_bits) * | |
607d432d | 985 | csum_size; |
c5c9cd4d SW |
986 | clen = size - coff; |
987 | if (key.offset + coverslen > off+len) | |
988 | clen -= ((key.offset+coverslen-off-len) >> | |
989 | root->fs_info->sb->s_blocksize_bits) * | |
607d432d | 990 | csum_size; |
c5c9cd4d SW |
991 | printk(" will dup %d~%d of %d\n", |
992 | coff, clen, size); | |
993 | ||
994 | memcpy(&new_key, &key, sizeof(new_key)); | |
995 | new_key.objectid = inode->i_ino; | |
996 | new_key.offset = key.offset + destoff - off; | |
997 | ||
998 | ret = btrfs_insert_empty_item(trans, root, path, | |
999 | &new_key, clen); | |
1000 | if (ret) | |
1001 | goto out; | |
1002 | ||
1003 | leaf = path->nodes[0]; | |
1004 | slot = path->slots[0]; | |
1005 | write_extent_buffer(leaf, buf + coff, | |
1006 | btrfs_item_ptr_offset(leaf, slot), | |
1007 | clen); | |
1008 | btrfs_mark_buffer_dirty(leaf); | |
1009 | } | |
1010 | ||
1011 | next: | |
31840ae1 | 1012 | btrfs_release_path(root, path); |
f46b5a66 | 1013 | key.offset++; |
f46b5a66 | 1014 | } |
f46b5a66 CH |
1015 | ret = 0; |
1016 | out: | |
ae01a0ab YZ |
1017 | btrfs_release_path(root, path); |
1018 | if (ret == 0) { | |
1019 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
c5c9cd4d SW |
1020 | if (destoff + olen > inode->i_size) |
1021 | btrfs_i_size_write(inode, destoff + olen); | |
ae01a0ab YZ |
1022 | BTRFS_I(inode)->flags = BTRFS_I(src)->flags; |
1023 | ret = btrfs_update_inode(trans, root, inode); | |
1024 | } | |
f46b5a66 | 1025 | btrfs_end_transaction(trans, root); |
c5c9cd4d | 1026 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
ae01a0ab YZ |
1027 | if (ret) |
1028 | vmtruncate(inode, 0); | |
f46b5a66 CH |
1029 | out_unlock: |
1030 | mutex_unlock(&src->i_mutex); | |
1031 | mutex_unlock(&inode->i_mutex); | |
ae01a0ab YZ |
1032 | vfree(buf); |
1033 | btrfs_free_path(path); | |
f46b5a66 CH |
1034 | out_fput: |
1035 | fput(src_file); | |
1036 | return ret; | |
1037 | } | |
1038 | ||
7a865e8a | 1039 | static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) |
c5c9cd4d SW |
1040 | { |
1041 | struct btrfs_ioctl_clone_range_args args; | |
1042 | ||
7a865e8a | 1043 | if (copy_from_user(&args, argp, sizeof(args))) |
c5c9cd4d SW |
1044 | return -EFAULT; |
1045 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, | |
1046 | args.src_length, args.dest_offset); | |
1047 | } | |
1048 | ||
f46b5a66 CH |
1049 | /* |
1050 | * there are many ways the trans_start and trans_end ioctls can lead | |
1051 | * to deadlocks. They should only be used by applications that | |
1052 | * basically own the machine, and have a very in depth understanding | |
1053 | * of all the possible deadlocks and enospc problems. | |
1054 | */ | |
b2950863 | 1055 | static long btrfs_ioctl_trans_start(struct file *file) |
f46b5a66 CH |
1056 | { |
1057 | struct inode *inode = fdentry(file)->d_inode; | |
1058 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1059 | struct btrfs_trans_handle *trans; | |
1060 | int ret = 0; | |
1061 | ||
df5b5520 CH |
1062 | if (!capable(CAP_SYS_ADMIN)) |
1063 | return -EPERM; | |
1064 | ||
f46b5a66 CH |
1065 | if (file->private_data) { |
1066 | ret = -EINPROGRESS; | |
1067 | goto out; | |
1068 | } | |
9ca9ee09 | 1069 | |
c146afad YZ |
1070 | ret = mnt_want_write(file->f_path.mnt); |
1071 | if (ret) | |
1072 | goto out; | |
1073 | ||
9ca9ee09 SW |
1074 | mutex_lock(&root->fs_info->trans_mutex); |
1075 | root->fs_info->open_ioctl_trans++; | |
1076 | mutex_unlock(&root->fs_info->trans_mutex); | |
1077 | ||
1078 | trans = btrfs_start_ioctl_transaction(root, 0); | |
f46b5a66 CH |
1079 | if (trans) |
1080 | file->private_data = trans; | |
1081 | else | |
1082 | ret = -ENOMEM; | |
1083 | /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/ | |
1084 | out: | |
f46b5a66 CH |
1085 | return ret; |
1086 | } | |
1087 | ||
1088 | /* | |
1089 | * there are many ways the trans_start and trans_end ioctls can lead | |
1090 | * to deadlocks. They should only be used by applications that | |
1091 | * basically own the machine, and have a very in depth understanding | |
1092 | * of all the possible deadlocks and enospc problems. | |
1093 | */ | |
1094 | long btrfs_ioctl_trans_end(struct file *file) | |
1095 | { | |
1096 | struct inode *inode = fdentry(file)->d_inode; | |
1097 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1098 | struct btrfs_trans_handle *trans; | |
1099 | int ret = 0; | |
1100 | ||
f46b5a66 CH |
1101 | trans = file->private_data; |
1102 | if (!trans) { | |
1103 | ret = -EINVAL; | |
1104 | goto out; | |
1105 | } | |
1106 | btrfs_end_transaction(trans, root); | |
b214107e | 1107 | file->private_data = NULL; |
9ca9ee09 SW |
1108 | |
1109 | mutex_lock(&root->fs_info->trans_mutex); | |
1110 | root->fs_info->open_ioctl_trans--; | |
1111 | mutex_unlock(&root->fs_info->trans_mutex); | |
1112 | ||
f46b5a66 | 1113 | out: |
f46b5a66 CH |
1114 | return ret; |
1115 | } | |
1116 | ||
1117 | long btrfs_ioctl(struct file *file, unsigned int | |
1118 | cmd, unsigned long arg) | |
1119 | { | |
1120 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; | |
4bcabaa3 | 1121 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
1122 | |
1123 | switch (cmd) { | |
1124 | case BTRFS_IOC_SNAP_CREATE: | |
4bcabaa3 | 1125 | return btrfs_ioctl_snap_create(file, argp, 0); |
3de4586c | 1126 | case BTRFS_IOC_SUBVOL_CREATE: |
4bcabaa3 | 1127 | return btrfs_ioctl_snap_create(file, argp, 1); |
f46b5a66 CH |
1128 | case BTRFS_IOC_DEFRAG: |
1129 | return btrfs_ioctl_defrag(file); | |
1130 | case BTRFS_IOC_RESIZE: | |
4bcabaa3 | 1131 | return btrfs_ioctl_resize(root, argp); |
f46b5a66 | 1132 | case BTRFS_IOC_ADD_DEV: |
4bcabaa3 | 1133 | return btrfs_ioctl_add_dev(root, argp); |
f46b5a66 | 1134 | case BTRFS_IOC_RM_DEV: |
4bcabaa3 | 1135 | return btrfs_ioctl_rm_dev(root, argp); |
f46b5a66 CH |
1136 | case BTRFS_IOC_BALANCE: |
1137 | return btrfs_balance(root->fs_info->dev_root); | |
1138 | case BTRFS_IOC_CLONE: | |
c5c9cd4d SW |
1139 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
1140 | case BTRFS_IOC_CLONE_RANGE: | |
7a865e8a | 1141 | return btrfs_ioctl_clone_range(file, argp); |
f46b5a66 CH |
1142 | case BTRFS_IOC_TRANS_START: |
1143 | return btrfs_ioctl_trans_start(file); | |
1144 | case BTRFS_IOC_TRANS_END: | |
1145 | return btrfs_ioctl_trans_end(file); | |
1146 | case BTRFS_IOC_SYNC: | |
1147 | btrfs_sync_fs(file->f_dentry->d_sb, 1); | |
1148 | return 0; | |
1149 | } | |
1150 | ||
1151 | return -ENOTTY; | |
1152 | } |