Commit | Line | Data |
---|---|---|
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; | |
0660b5af CM |
148 | |
149 | /* add the backref first */ | |
150 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, | |
151 | objectid, BTRFS_ROOT_BACKREF_KEY, | |
152 | root->root_key.objectid, | |
153 | dir->i_ino, index, name, namelen); | |
154 | ||
155 | BUG_ON(ret); | |
156 | ||
157 | /* now add the forward ref */ | |
158 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, | |
159 | root->root_key.objectid, BTRFS_ROOT_REF_KEY, | |
160 | objectid, | |
161 | dir->i_ino, index, name, namelen); | |
162 | ||
163 | BUG_ON(ret); | |
164 | ||
f46b5a66 CH |
165 | ret = btrfs_commit_transaction(trans, root); |
166 | if (ret) | |
167 | goto fail_commit; | |
168 | ||
3de4586c | 169 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); |
f46b5a66 CH |
170 | BUG_ON(!new_root); |
171 | ||
172 | trans = btrfs_start_transaction(new_root, 1); | |
173 | BUG_ON(!trans); | |
174 | ||
cb8e7090 | 175 | ret = btrfs_create_subvol_root(new_root, dentry, trans, new_dirid, |
f46b5a66 CH |
176 | BTRFS_I(dir)->block_group); |
177 | if (ret) | |
178 | goto fail; | |
179 | ||
f46b5a66 CH |
180 | fail: |
181 | nr = trans->blocks_used; | |
182 | err = btrfs_commit_transaction(trans, new_root); | |
183 | if (err && !ret) | |
184 | ret = err; | |
185 | fail_commit: | |
f46b5a66 | 186 | btrfs_btree_balance_dirty(root, nr); |
f46b5a66 CH |
187 | return ret; |
188 | } | |
189 | ||
3de4586c CM |
190 | static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, |
191 | char *name, int namelen) | |
f46b5a66 CH |
192 | { |
193 | struct btrfs_pending_snapshot *pending_snapshot; | |
194 | struct btrfs_trans_handle *trans; | |
3de4586c | 195 | int ret = 0; |
f46b5a66 CH |
196 | int err; |
197 | unsigned long nr = 0; | |
198 | ||
199 | if (!root->ref_cows) | |
200 | return -EINVAL; | |
201 | ||
f46b5a66 CH |
202 | ret = btrfs_check_free_space(root, 1, 0); |
203 | if (ret) | |
204 | goto fail_unlock; | |
205 | ||
3de4586c | 206 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
f46b5a66 CH |
207 | if (!pending_snapshot) { |
208 | ret = -ENOMEM; | |
209 | goto fail_unlock; | |
210 | } | |
211 | pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); | |
212 | if (!pending_snapshot->name) { | |
213 | ret = -ENOMEM; | |
214 | kfree(pending_snapshot); | |
215 | goto fail_unlock; | |
216 | } | |
217 | memcpy(pending_snapshot->name, name, namelen); | |
218 | pending_snapshot->name[namelen] = '\0'; | |
3de4586c | 219 | pending_snapshot->dentry = dentry; |
f46b5a66 CH |
220 | trans = btrfs_start_transaction(root, 1); |
221 | BUG_ON(!trans); | |
222 | pending_snapshot->root = root; | |
223 | list_add(&pending_snapshot->list, | |
224 | &trans->transaction->pending_snapshots); | |
f46b5a66 CH |
225 | err = btrfs_commit_transaction(trans, root); |
226 | ||
227 | fail_unlock: | |
f46b5a66 | 228 | btrfs_btree_balance_dirty(root, nr); |
f46b5a66 CH |
229 | return ret; |
230 | } | |
231 | ||
cb8e7090 CH |
232 | /* copy of may_create in fs/namei.c() */ |
233 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
234 | { | |
235 | if (child->d_inode) | |
236 | return -EEXIST; | |
237 | if (IS_DEADDIR(dir)) | |
238 | return -ENOENT; | |
239 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
240 | } | |
241 | ||
242 | /* | |
243 | * Create a new subvolume below @parent. This is largely modeled after | |
244 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
245 | * inside this filesystem so it's quite a bit simpler. | |
246 | */ | |
247 | static noinline int btrfs_mksubvol(struct path *parent, char *name, | |
3de4586c CM |
248 | int mode, int namelen, |
249 | struct btrfs_root *snap_src) | |
cb8e7090 CH |
250 | { |
251 | struct dentry *dentry; | |
252 | int error; | |
253 | ||
254 | mutex_lock_nested(&parent->dentry->d_inode->i_mutex, I_MUTEX_PARENT); | |
255 | ||
256 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
257 | error = PTR_ERR(dentry); | |
258 | if (IS_ERR(dentry)) | |
259 | goto out_unlock; | |
260 | ||
261 | error = -EEXIST; | |
262 | if (dentry->d_inode) | |
263 | goto out_dput; | |
264 | ||
265 | if (!IS_POSIXACL(parent->dentry->d_inode)) | |
266 | mode &= ~current->fs->umask; | |
3de4586c | 267 | |
cb8e7090 CH |
268 | error = mnt_want_write(parent->mnt); |
269 | if (error) | |
270 | goto out_dput; | |
271 | ||
272 | error = btrfs_may_create(parent->dentry->d_inode, dentry); | |
273 | if (error) | |
274 | goto out_drop_write; | |
275 | ||
cb8e7090 CH |
276 | /* |
277 | * Actually perform the low-level subvolume creation after all | |
278 | * this VFS fuzz. | |
279 | * | |
280 | * Eventually we want to pass in an inode under which we create this | |
281 | * subvolume, but for now all are under the filesystem root. | |
282 | * | |
283 | * Also we should pass on the mode eventually to allow creating new | |
284 | * subvolume with specific mode bits. | |
285 | */ | |
3de4586c | 286 | if (snap_src) { |
ea9e8b11 CM |
287 | struct dentry *dir = dentry->d_parent; |
288 | struct dentry *test = dir->d_parent; | |
289 | struct btrfs_path *path = btrfs_alloc_path(); | |
290 | int ret; | |
291 | u64 test_oid; | |
292 | u64 parent_oid = BTRFS_I(dir->d_inode)->root->root_key.objectid; | |
293 | ||
294 | test_oid = snap_src->root_key.objectid; | |
295 | ||
296 | ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, | |
297 | path, parent_oid, test_oid); | |
298 | if (ret == 0) | |
299 | goto create; | |
300 | btrfs_release_path(snap_src->fs_info->tree_root, path); | |
301 | ||
302 | /* we need to make sure we aren't creating a directory loop | |
303 | * by taking a snapshot of something that has our current | |
304 | * subvol in its directory tree. So, this loops through | |
305 | * the dentries and checks the forward refs for each subvolume | |
306 | * to see if is references the subvolume where we are | |
307 | * placing this new snapshot. | |
308 | */ | |
309 | while(1) { | |
310 | if (!test || | |
311 | dir == snap_src->fs_info->sb->s_root || | |
312 | test == snap_src->fs_info->sb->s_root || | |
313 | test->d_inode->i_sb != snap_src->fs_info->sb) { | |
314 | break; | |
315 | } | |
316 | if (S_ISLNK(test->d_inode->i_mode)) { | |
317 | printk("Symlink in snapshot path, failed\n"); | |
318 | error = -EMLINK; | |
319 | btrfs_free_path(path); | |
320 | goto out_drop_write; | |
321 | } | |
322 | test_oid = | |
323 | BTRFS_I(test->d_inode)->root->root_key.objectid; | |
324 | ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, | |
325 | path, test_oid, parent_oid); | |
326 | if (ret == 0) { | |
327 | printk("Snapshot creation failed, looping\n"); | |
328 | error = -EMLINK; | |
329 | btrfs_free_path(path); | |
330 | goto out_drop_write; | |
331 | } | |
332 | btrfs_release_path(snap_src->fs_info->tree_root, path); | |
333 | test = test->d_parent; | |
334 | } | |
335 | create: | |
336 | btrfs_free_path(path); | |
3de4586c CM |
337 | error = create_snapshot(snap_src, dentry, name, namelen); |
338 | } else { | |
339 | error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root, | |
340 | dentry, name, namelen); | |
341 | } | |
cb8e7090 CH |
342 | if (error) |
343 | goto out_drop_write; | |
344 | ||
345 | fsnotify_mkdir(parent->dentry->d_inode, dentry); | |
346 | out_drop_write: | |
347 | mnt_drop_write(parent->mnt); | |
348 | out_dput: | |
349 | dput(dentry); | |
350 | out_unlock: | |
351 | mutex_unlock(&parent->dentry->d_inode->i_mutex); | |
352 | return error; | |
353 | } | |
354 | ||
355 | ||
f46b5a66 CH |
356 | int btrfs_defrag_file(struct file *file) |
357 | { | |
358 | struct inode *inode = fdentry(file)->d_inode; | |
359 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
360 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
3eaa2885 | 361 | struct btrfs_ordered_extent *ordered; |
f46b5a66 CH |
362 | struct page *page; |
363 | unsigned long last_index; | |
364 | unsigned long ra_pages = root->fs_info->bdi.ra_pages; | |
365 | unsigned long total_read = 0; | |
366 | u64 page_start; | |
367 | u64 page_end; | |
368 | unsigned long i; | |
369 | int ret; | |
370 | ||
f46b5a66 | 371 | ret = btrfs_check_free_space(root, inode->i_size, 0); |
f46b5a66 CH |
372 | if (ret) |
373 | return -ENOSPC; | |
374 | ||
375 | mutex_lock(&inode->i_mutex); | |
376 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
377 | for (i = 0; i <= last_index; i++) { | |
378 | if (total_read % ra_pages == 0) { | |
379 | btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, | |
380 | min(last_index, i + ra_pages - 1)); | |
381 | } | |
382 | total_read++; | |
3eaa2885 | 383 | again: |
f46b5a66 CH |
384 | page = grab_cache_page(inode->i_mapping, i); |
385 | if (!page) | |
386 | goto out_unlock; | |
387 | if (!PageUptodate(page)) { | |
388 | btrfs_readpage(NULL, page); | |
389 | lock_page(page); | |
390 | if (!PageUptodate(page)) { | |
391 | unlock_page(page); | |
392 | page_cache_release(page); | |
393 | goto out_unlock; | |
394 | } | |
395 | } | |
396 | ||
f46b5a66 | 397 | wait_on_page_writeback(page); |
f46b5a66 CH |
398 | |
399 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; | |
400 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
f46b5a66 | 401 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
3eaa2885 CM |
402 | |
403 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
404 | if (ordered) { | |
405 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
406 | unlock_page(page); | |
407 | page_cache_release(page); | |
408 | btrfs_start_ordered_extent(inode, ordered, 1); | |
409 | btrfs_put_ordered_extent(ordered); | |
410 | goto again; | |
411 | } | |
412 | set_page_extent_mapped(page); | |
413 | ||
f87f057b CM |
414 | /* |
415 | * this makes sure page_mkwrite is called on the | |
416 | * page if it is dirtied again later | |
417 | */ | |
418 | clear_page_dirty_for_io(page); | |
419 | ||
ea8c2819 | 420 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
f46b5a66 CH |
421 | |
422 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
423 | set_page_dirty(page); | |
424 | unlock_page(page); | |
425 | page_cache_release(page); | |
426 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
427 | } | |
428 | ||
429 | out_unlock: | |
430 | mutex_unlock(&inode->i_mutex); | |
431 | return 0; | |
432 | } | |
433 | ||
434 | /* | |
435 | * Called inside transaction, so use GFP_NOFS | |
436 | */ | |
437 | ||
438 | static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) | |
439 | { | |
440 | u64 new_size; | |
441 | u64 old_size; | |
442 | u64 devid = 1; | |
443 | struct btrfs_ioctl_vol_args *vol_args; | |
444 | struct btrfs_trans_handle *trans; | |
445 | struct btrfs_device *device = NULL; | |
446 | char *sizestr; | |
447 | char *devstr = NULL; | |
448 | int ret = 0; | |
449 | int namelen; | |
450 | int mod = 0; | |
451 | ||
c146afad YZ |
452 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
453 | return -EROFS; | |
454 | ||
f46b5a66 CH |
455 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
456 | ||
457 | if (!vol_args) | |
458 | return -ENOMEM; | |
459 | ||
460 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
461 | ret = -EFAULT; | |
462 | goto out; | |
463 | } | |
5516e595 MF |
464 | |
465 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 466 | namelen = strlen(vol_args->name); |
f46b5a66 | 467 | |
7d9eb12c | 468 | mutex_lock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
469 | sizestr = vol_args->name; |
470 | devstr = strchr(sizestr, ':'); | |
471 | if (devstr) { | |
472 | char *end; | |
473 | sizestr = devstr + 1; | |
474 | *devstr = '\0'; | |
475 | devstr = vol_args->name; | |
476 | devid = simple_strtoull(devstr, &end, 10); | |
477 | printk(KERN_INFO "resizing devid %llu\n", devid); | |
478 | } | |
2b82032c | 479 | device = btrfs_find_device(root, devid, NULL, NULL); |
f46b5a66 CH |
480 | if (!device) { |
481 | printk(KERN_INFO "resizer unable to find device %llu\n", devid); | |
482 | ret = -EINVAL; | |
483 | goto out_unlock; | |
484 | } | |
485 | if (!strcmp(sizestr, "max")) | |
486 | new_size = device->bdev->bd_inode->i_size; | |
487 | else { | |
488 | if (sizestr[0] == '-') { | |
489 | mod = -1; | |
490 | sizestr++; | |
491 | } else if (sizestr[0] == '+') { | |
492 | mod = 1; | |
493 | sizestr++; | |
494 | } | |
495 | new_size = btrfs_parse_size(sizestr); | |
496 | if (new_size == 0) { | |
497 | ret = -EINVAL; | |
498 | goto out_unlock; | |
499 | } | |
500 | } | |
501 | ||
502 | old_size = device->total_bytes; | |
503 | ||
504 | if (mod < 0) { | |
505 | if (new_size > old_size) { | |
506 | ret = -EINVAL; | |
507 | goto out_unlock; | |
508 | } | |
509 | new_size = old_size - new_size; | |
510 | } else if (mod > 0) { | |
511 | new_size = old_size + new_size; | |
512 | } | |
513 | ||
514 | if (new_size < 256 * 1024 * 1024) { | |
515 | ret = -EINVAL; | |
516 | goto out_unlock; | |
517 | } | |
518 | if (new_size > device->bdev->bd_inode->i_size) { | |
519 | ret = -EFBIG; | |
520 | goto out_unlock; | |
521 | } | |
522 | ||
523 | do_div(new_size, root->sectorsize); | |
524 | new_size *= root->sectorsize; | |
525 | ||
526 | printk(KERN_INFO "new size for %s is %llu\n", | |
527 | device->name, (unsigned long long)new_size); | |
528 | ||
529 | if (new_size > old_size) { | |
530 | trans = btrfs_start_transaction(root, 1); | |
531 | ret = btrfs_grow_device(trans, device, new_size); | |
532 | btrfs_commit_transaction(trans, root); | |
533 | } else { | |
534 | ret = btrfs_shrink_device(device, new_size); | |
535 | } | |
536 | ||
537 | out_unlock: | |
7d9eb12c | 538 | mutex_unlock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
539 | out: |
540 | kfree(vol_args); | |
541 | return ret; | |
542 | } | |
543 | ||
cb8e7090 | 544 | static noinline int btrfs_ioctl_snap_create(struct file *file, |
3de4586c | 545 | void __user *arg, int subvol) |
f46b5a66 | 546 | { |
cb8e7090 | 547 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
f46b5a66 CH |
548 | struct btrfs_ioctl_vol_args *vol_args; |
549 | struct btrfs_dir_item *di; | |
550 | struct btrfs_path *path; | |
3de4586c | 551 | struct file *src_file; |
f46b5a66 CH |
552 | u64 root_dirid; |
553 | int namelen; | |
3de4586c | 554 | int ret = 0; |
f46b5a66 | 555 | |
c146afad YZ |
556 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
557 | return -EROFS; | |
558 | ||
f46b5a66 CH |
559 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
560 | ||
561 | if (!vol_args) | |
562 | return -ENOMEM; | |
563 | ||
564 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
565 | ret = -EFAULT; | |
566 | goto out; | |
567 | } | |
568 | ||
5516e595 | 569 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 | 570 | namelen = strlen(vol_args->name); |
f46b5a66 CH |
571 | if (strchr(vol_args->name, '/')) { |
572 | ret = -EINVAL; | |
573 | goto out; | |
574 | } | |
575 | ||
576 | path = btrfs_alloc_path(); | |
577 | if (!path) { | |
578 | ret = -ENOMEM; | |
579 | goto out; | |
580 | } | |
581 | ||
582 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
f46b5a66 CH |
583 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, |
584 | path, root_dirid, | |
585 | vol_args->name, namelen, 0); | |
f46b5a66 CH |
586 | btrfs_free_path(path); |
587 | ||
588 | if (di && !IS_ERR(di)) { | |
589 | ret = -EEXIST; | |
590 | goto out; | |
591 | } | |
592 | ||
593 | if (IS_ERR(di)) { | |
594 | ret = PTR_ERR(di); | |
595 | goto out; | |
596 | } | |
597 | ||
3de4586c | 598 | if (subvol) { |
cb8e7090 CH |
599 | ret = btrfs_mksubvol(&file->f_path, vol_args->name, |
600 | file->f_path.dentry->d_inode->i_mode, | |
3de4586c | 601 | namelen, NULL); |
cb8e7090 | 602 | } else { |
3de4586c CM |
603 | struct inode *src_inode; |
604 | src_file = fget(vol_args->fd); | |
605 | if (!src_file) { | |
606 | ret = -EINVAL; | |
607 | goto out; | |
608 | } | |
609 | ||
610 | src_inode = src_file->f_path.dentry->d_inode; | |
611 | if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { | |
612 | printk("btrfs: Snapshot src from another FS\n"); | |
613 | ret = -EINVAL; | |
614 | fput(src_file); | |
615 | goto out; | |
616 | } | |
617 | ret = btrfs_mksubvol(&file->f_path, vol_args->name, | |
618 | file->f_path.dentry->d_inode->i_mode, | |
619 | namelen, BTRFS_I(src_inode)->root); | |
620 | fput(src_file); | |
cb8e7090 CH |
621 | } |
622 | ||
f46b5a66 CH |
623 | out: |
624 | kfree(vol_args); | |
625 | return ret; | |
626 | } | |
627 | ||
628 | static int btrfs_ioctl_defrag(struct file *file) | |
629 | { | |
630 | struct inode *inode = fdentry(file)->d_inode; | |
631 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
c146afad YZ |
632 | int ret; |
633 | ||
634 | ret = mnt_want_write(file->f_path.mnt); | |
635 | if (ret) | |
636 | return ret; | |
f46b5a66 CH |
637 | |
638 | switch (inode->i_mode & S_IFMT) { | |
639 | case S_IFDIR: | |
f46b5a66 CH |
640 | btrfs_defrag_root(root, 0); |
641 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
f46b5a66 CH |
642 | break; |
643 | case S_IFREG: | |
644 | btrfs_defrag_file(file); | |
645 | break; | |
646 | } | |
647 | ||
648 | return 0; | |
649 | } | |
650 | ||
651 | long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) | |
652 | { | |
653 | struct btrfs_ioctl_vol_args *vol_args; | |
654 | int ret; | |
655 | ||
656 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); | |
657 | ||
658 | if (!vol_args) | |
659 | return -ENOMEM; | |
660 | ||
661 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
662 | ret = -EFAULT; | |
663 | goto out; | |
664 | } | |
5516e595 | 665 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
666 | ret = btrfs_init_new_device(root, vol_args->name); |
667 | ||
668 | out: | |
669 | kfree(vol_args); | |
670 | return ret; | |
671 | } | |
672 | ||
673 | long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) | |
674 | { | |
675 | struct btrfs_ioctl_vol_args *vol_args; | |
676 | int ret; | |
677 | ||
c146afad YZ |
678 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
679 | return -EROFS; | |
680 | ||
f46b5a66 CH |
681 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
682 | ||
683 | if (!vol_args) | |
684 | return -ENOMEM; | |
685 | ||
686 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
687 | ret = -EFAULT; | |
688 | goto out; | |
689 | } | |
5516e595 | 690 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
691 | ret = btrfs_rm_device(root, vol_args->name); |
692 | ||
693 | out: | |
694 | kfree(vol_args); | |
695 | return ret; | |
696 | } | |
697 | ||
c5c9cd4d SW |
698 | long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off, |
699 | u64 olen, u64 destoff) | |
f46b5a66 CH |
700 | { |
701 | struct inode *inode = fdentry(file)->d_inode; | |
702 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
703 | struct file *src_file; | |
704 | struct inode *src; | |
705 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 706 | struct btrfs_path *path; |
f46b5a66 | 707 | struct extent_buffer *leaf; |
ae01a0ab YZ |
708 | char *buf; |
709 | struct btrfs_key key; | |
f46b5a66 CH |
710 | u32 nritems; |
711 | int slot; | |
ae01a0ab | 712 | int ret; |
c5c9cd4d SW |
713 | u64 len = olen; |
714 | u64 bs = root->fs_info->sb->s_blocksize; | |
715 | u64 hint_byte; | |
f46b5a66 | 716 | |
c5c9cd4d SW |
717 | /* |
718 | * TODO: | |
719 | * - split compressed inline extents. annoying: we need to | |
720 | * decompress into destination's address_space (the file offset | |
721 | * may change, so source mapping won't do), then recompress (or | |
722 | * otherwise reinsert) a subrange. | |
723 | * - allow ranges within the same file to be cloned (provided | |
724 | * they don't overlap)? | |
725 | */ | |
726 | ||
c146afad YZ |
727 | ret = mnt_want_write(file->f_path.mnt); |
728 | if (ret) | |
729 | return ret; | |
730 | ||
c5c9cd4d | 731 | src_file = fget(srcfd); |
f46b5a66 CH |
732 | if (!src_file) |
733 | return -EBADF; | |
734 | src = src_file->f_dentry->d_inode; | |
735 | ||
c5c9cd4d SW |
736 | ret = -EINVAL; |
737 | if (src == inode) | |
738 | goto out_fput; | |
739 | ||
ae01a0ab YZ |
740 | ret = -EISDIR; |
741 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) | |
742 | goto out_fput; | |
743 | ||
f46b5a66 | 744 | ret = -EXDEV; |
ae01a0ab YZ |
745 | if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) |
746 | goto out_fput; | |
747 | ||
748 | ret = -ENOMEM; | |
749 | buf = vmalloc(btrfs_level_size(root, 0)); | |
750 | if (!buf) | |
751 | goto out_fput; | |
752 | ||
753 | path = btrfs_alloc_path(); | |
754 | if (!path) { | |
755 | vfree(buf); | |
f46b5a66 | 756 | goto out_fput; |
ae01a0ab YZ |
757 | } |
758 | path->reada = 2; | |
f46b5a66 CH |
759 | |
760 | if (inode < src) { | |
761 | mutex_lock(&inode->i_mutex); | |
762 | mutex_lock(&src->i_mutex); | |
763 | } else { | |
764 | mutex_lock(&src->i_mutex); | |
765 | mutex_lock(&inode->i_mutex); | |
766 | } | |
767 | ||
c5c9cd4d SW |
768 | /* determine range to clone */ |
769 | ret = -EINVAL; | |
770 | if (off >= src->i_size || off + len > src->i_size) | |
f46b5a66 | 771 | goto out_unlock; |
c5c9cd4d SW |
772 | if (len == 0) |
773 | olen = len = src->i_size - off; | |
774 | /* if we extend to eof, continue to block boundary */ | |
775 | if (off + len == src->i_size) | |
776 | len = ((src->i_size + bs-1) & ~(bs-1)) | |
777 | - off; | |
778 | ||
779 | /* verify the end result is block aligned */ | |
780 | if ((off & (bs-1)) || | |
781 | ((off + len) & (bs-1))) | |
782 | goto out_unlock; | |
783 | ||
784 | printk("final src extent is %llu~%llu\n", off, len); | |
785 | printk("final dst extent is %llu~%llu\n", destoff, len); | |
f46b5a66 CH |
786 | |
787 | /* do any pending delalloc/csum calc on src, one way or | |
788 | another, and lock file content */ | |
789 | while (1) { | |
31840ae1 | 790 | struct btrfs_ordered_extent *ordered; |
c5c9cd4d SW |
791 | lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
792 | ordered = btrfs_lookup_first_ordered_extent(inode, off+len); | |
ae01a0ab | 793 | if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) |
f46b5a66 | 794 | break; |
c5c9cd4d | 795 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
ae01a0ab YZ |
796 | if (ordered) |
797 | btrfs_put_ordered_extent(ordered); | |
c5c9cd4d | 798 | btrfs_wait_ordered_range(src, off, off+len); |
f46b5a66 CH |
799 | } |
800 | ||
ae01a0ab YZ |
801 | trans = btrfs_start_transaction(root, 1); |
802 | BUG_ON(!trans); | |
803 | ||
c5c9cd4d SW |
804 | /* punch hole in destination first */ |
805 | btrfs_drop_extents(trans, root, inode, off, off+len, 0, &hint_byte); | |
806 | ||
807 | /* clone data */ | |
f46b5a66 | 808 | key.objectid = src->i_ino; |
ae01a0ab YZ |
809 | key.type = BTRFS_EXTENT_DATA_KEY; |
810 | key.offset = 0; | |
f46b5a66 CH |
811 | |
812 | while (1) { | |
813 | /* | |
814 | * note the key will change type as we walk through the | |
815 | * tree. | |
816 | */ | |
817 | ret = btrfs_search_slot(trans, root, &key, path, 0, 0); | |
818 | if (ret < 0) | |
819 | goto out; | |
820 | ||
ae01a0ab YZ |
821 | nritems = btrfs_header_nritems(path->nodes[0]); |
822 | if (path->slots[0] >= nritems) { | |
f46b5a66 CH |
823 | ret = btrfs_next_leaf(root, path); |
824 | if (ret < 0) | |
825 | goto out; | |
826 | if (ret > 0) | |
827 | break; | |
ae01a0ab | 828 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
829 | } |
830 | leaf = path->nodes[0]; | |
831 | slot = path->slots[0]; | |
f46b5a66 | 832 | |
ae01a0ab | 833 | btrfs_item_key_to_cpu(leaf, &key, slot); |
f46b5a66 CH |
834 | if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY || |
835 | key.objectid != src->i_ino) | |
836 | break; | |
837 | ||
c5c9cd4d SW |
838 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
839 | struct btrfs_file_extent_item *extent; | |
840 | int type; | |
31840ae1 ZY |
841 | u32 size; |
842 | struct btrfs_key new_key; | |
c5c9cd4d SW |
843 | u64 disko = 0, diskl = 0; |
844 | u64 datao = 0, datal = 0; | |
845 | u8 comp; | |
31840ae1 ZY |
846 | |
847 | size = btrfs_item_size_nr(leaf, slot); | |
848 | read_extent_buffer(leaf, buf, | |
849 | btrfs_item_ptr_offset(leaf, slot), | |
850 | size); | |
c5c9cd4d SW |
851 | |
852 | extent = btrfs_item_ptr(leaf, slot, | |
853 | struct btrfs_file_extent_item); | |
854 | comp = btrfs_file_extent_compression(leaf, extent); | |
855 | type = btrfs_file_extent_type(leaf, extent); | |
856 | if (type == BTRFS_FILE_EXTENT_REG) { | |
857 | disko = btrfs_file_extent_disk_bytenr(leaf, extent); | |
858 | diskl = btrfs_file_extent_disk_num_bytes(leaf, extent); | |
859 | datao = btrfs_file_extent_offset(leaf, extent); | |
860 | datal = btrfs_file_extent_num_bytes(leaf, extent); | |
861 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { | |
862 | /* take upper bound, may be compressed */ | |
863 | datal = btrfs_file_extent_ram_bytes(leaf, | |
864 | extent); | |
865 | } | |
31840ae1 ZY |
866 | btrfs_release_path(root, path); |
867 | ||
c5c9cd4d SW |
868 | if (key.offset + datal < off || |
869 | key.offset >= off+len) | |
870 | goto next; | |
871 | ||
31840ae1 ZY |
872 | memcpy(&new_key, &key, sizeof(new_key)); |
873 | new_key.objectid = inode->i_ino; | |
c5c9cd4d | 874 | new_key.offset = key.offset + destoff - off; |
31840ae1 | 875 | |
c5c9cd4d SW |
876 | if (type == BTRFS_FILE_EXTENT_REG) { |
877 | ret = btrfs_insert_empty_item(trans, root, path, | |
878 | &new_key, size); | |
879 | if (ret) | |
880 | goto out; | |
881 | ||
882 | leaf = path->nodes[0]; | |
883 | slot = path->slots[0]; | |
884 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
885 | btrfs_item_ptr_offset(leaf, slot), |
886 | size); | |
ae01a0ab | 887 | |
c5c9cd4d | 888 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 889 | struct btrfs_file_extent_item); |
c5c9cd4d SW |
890 | printk(" orig disk %llu~%llu data %llu~%llu\n", |
891 | disko, diskl, datao, datal); | |
892 | ||
893 | if (off > key.offset) { | |
894 | datao += off - key.offset; | |
895 | datal -= off - key.offset; | |
896 | } | |
897 | if (key.offset + datao + datal + key.offset > | |
898 | off + len) | |
899 | datal = off + len - key.offset - datao; | |
900 | /* disko == 0 means it's a hole */ | |
901 | if (!disko) | |
902 | datao = 0; | |
903 | printk(" final disk %llu~%llu data %llu~%llu\n", | |
904 | disko, diskl, datao, datal); | |
905 | ||
906 | btrfs_set_file_extent_offset(leaf, extent, | |
907 | datao); | |
908 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
909 | datal); | |
910 | if (disko) { | |
911 | inode_add_bytes(inode, datal); | |
ae01a0ab | 912 | ret = btrfs_inc_extent_ref(trans, root, |
c5c9cd4d SW |
913 | disko, diskl, leaf->start, |
914 | root->root_key.objectid, | |
915 | trans->transid, | |
916 | inode->i_ino); | |
31840ae1 | 917 | BUG_ON(ret); |
f46b5a66 | 918 | } |
c5c9cd4d SW |
919 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
920 | u64 skip = 0; | |
921 | u64 trim = 0; | |
922 | if (off > key.offset) { | |
923 | skip = off - key.offset; | |
924 | new_key.offset += skip; | |
925 | } | |
926 | if (key.offset + datal > off+len) | |
927 | trim = key.offset + datal - (off+len); | |
928 | printk("len %lld skip %lld trim %lld\n", | |
929 | datal, skip, trim); | |
930 | if (comp && (skip || trim)) { | |
931 | printk("btrfs clone_range can't split compressed inline extents yet\n"); | |
932 | ret = -EINVAL; | |
933 | goto out; | |
934 | } | |
935 | size -= skip + trim; | |
936 | datal -= skip + trim; | |
937 | ret = btrfs_insert_empty_item(trans, root, path, | |
938 | &new_key, size); | |
939 | if (ret) | |
940 | goto out; | |
941 | ||
942 | if (skip) { | |
943 | u32 start = btrfs_file_extent_calc_inline_size(0); | |
944 | memmove(buf+start, buf+start+skip, | |
945 | datal); | |
946 | } | |
947 | ||
948 | leaf = path->nodes[0]; | |
949 | slot = path->slots[0]; | |
950 | write_extent_buffer(leaf, buf, | |
951 | btrfs_item_ptr_offset(leaf, slot), | |
952 | size); | |
953 | inode_add_bytes(inode, datal); | |
f46b5a66 | 954 | } |
c5c9cd4d SW |
955 | |
956 | btrfs_mark_buffer_dirty(leaf); | |
ae01a0ab | 957 | } |
c5c9cd4d SW |
958 | |
959 | if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) { | |
960 | u32 size; | |
961 | struct btrfs_key new_key; | |
962 | u64 coverslen; | |
963 | int coff, clen; | |
964 | ||
965 | size = btrfs_item_size_nr(leaf, slot); | |
966 | coverslen = (size / BTRFS_CRC32_SIZE) << | |
967 | root->fs_info->sb->s_blocksize_bits; | |
968 | printk("csums for %llu~%llu\n", | |
969 | key.offset, coverslen); | |
970 | if (key.offset + coverslen < off || | |
971 | key.offset >= off+len) | |
972 | goto next; | |
973 | ||
974 | read_extent_buffer(leaf, buf, | |
975 | btrfs_item_ptr_offset(leaf, slot), | |
976 | size); | |
977 | btrfs_release_path(root, path); | |
978 | ||
979 | coff = 0; | |
980 | if (off > key.offset) | |
981 | coff = ((off - key.offset) >> | |
982 | root->fs_info->sb->s_blocksize_bits) * | |
983 | BTRFS_CRC32_SIZE; | |
984 | clen = size - coff; | |
985 | if (key.offset + coverslen > off+len) | |
986 | clen -= ((key.offset+coverslen-off-len) >> | |
987 | root->fs_info->sb->s_blocksize_bits) * | |
988 | BTRFS_CRC32_SIZE; | |
989 | printk(" will dup %d~%d of %d\n", | |
990 | coff, clen, size); | |
991 | ||
992 | memcpy(&new_key, &key, sizeof(new_key)); | |
993 | new_key.objectid = inode->i_ino; | |
994 | new_key.offset = key.offset + destoff - off; | |
995 | ||
996 | ret = btrfs_insert_empty_item(trans, root, path, | |
997 | &new_key, clen); | |
998 | if (ret) | |
999 | goto out; | |
1000 | ||
1001 | leaf = path->nodes[0]; | |
1002 | slot = path->slots[0]; | |
1003 | write_extent_buffer(leaf, buf + coff, | |
1004 | btrfs_item_ptr_offset(leaf, slot), | |
1005 | clen); | |
1006 | btrfs_mark_buffer_dirty(leaf); | |
1007 | } | |
1008 | ||
1009 | next: | |
31840ae1 | 1010 | btrfs_release_path(root, path); |
f46b5a66 | 1011 | key.offset++; |
f46b5a66 | 1012 | } |
f46b5a66 CH |
1013 | ret = 0; |
1014 | out: | |
ae01a0ab YZ |
1015 | btrfs_release_path(root, path); |
1016 | if (ret == 0) { | |
1017 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
c5c9cd4d SW |
1018 | if (destoff + olen > inode->i_size) |
1019 | btrfs_i_size_write(inode, destoff + olen); | |
ae01a0ab YZ |
1020 | BTRFS_I(inode)->flags = BTRFS_I(src)->flags; |
1021 | ret = btrfs_update_inode(trans, root, inode); | |
1022 | } | |
f46b5a66 | 1023 | btrfs_end_transaction(trans, root); |
c5c9cd4d | 1024 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
ae01a0ab YZ |
1025 | if (ret) |
1026 | vmtruncate(inode, 0); | |
f46b5a66 CH |
1027 | out_unlock: |
1028 | mutex_unlock(&src->i_mutex); | |
1029 | mutex_unlock(&inode->i_mutex); | |
ae01a0ab YZ |
1030 | vfree(buf); |
1031 | btrfs_free_path(path); | |
f46b5a66 CH |
1032 | out_fput: |
1033 | fput(src_file); | |
1034 | return ret; | |
1035 | } | |
1036 | ||
c5c9cd4d SW |
1037 | long btrfs_ioctl_clone_range(struct file *file, unsigned long argptr) |
1038 | { | |
1039 | struct btrfs_ioctl_clone_range_args args; | |
1040 | ||
1041 | if (copy_from_user(&args, (void *)argptr, sizeof(args))) | |
1042 | return -EFAULT; | |
1043 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, | |
1044 | args.src_length, args.dest_offset); | |
1045 | } | |
1046 | ||
f46b5a66 CH |
1047 | /* |
1048 | * there are many ways the trans_start and trans_end ioctls can lead | |
1049 | * to deadlocks. They should only be used by applications that | |
1050 | * basically own the machine, and have a very in depth understanding | |
1051 | * of all the possible deadlocks and enospc problems. | |
1052 | */ | |
1053 | long btrfs_ioctl_trans_start(struct file *file) | |
1054 | { | |
1055 | struct inode *inode = fdentry(file)->d_inode; | |
1056 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1057 | struct btrfs_trans_handle *trans; | |
1058 | int ret = 0; | |
1059 | ||
df5b5520 CH |
1060 | if (!capable(CAP_SYS_ADMIN)) |
1061 | return -EPERM; | |
1062 | ||
f46b5a66 CH |
1063 | if (file->private_data) { |
1064 | ret = -EINPROGRESS; | |
1065 | goto out; | |
1066 | } | |
9ca9ee09 | 1067 | |
c146afad YZ |
1068 | ret = mnt_want_write(file->f_path.mnt); |
1069 | if (ret) | |
1070 | goto out; | |
1071 | ||
9ca9ee09 SW |
1072 | mutex_lock(&root->fs_info->trans_mutex); |
1073 | root->fs_info->open_ioctl_trans++; | |
1074 | mutex_unlock(&root->fs_info->trans_mutex); | |
1075 | ||
1076 | trans = btrfs_start_ioctl_transaction(root, 0); | |
f46b5a66 CH |
1077 | if (trans) |
1078 | file->private_data = trans; | |
1079 | else | |
1080 | ret = -ENOMEM; | |
1081 | /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/ | |
1082 | out: | |
f46b5a66 CH |
1083 | return ret; |
1084 | } | |
1085 | ||
1086 | /* | |
1087 | * there are many ways the trans_start and trans_end ioctls can lead | |
1088 | * to deadlocks. They should only be used by applications that | |
1089 | * basically own the machine, and have a very in depth understanding | |
1090 | * of all the possible deadlocks and enospc problems. | |
1091 | */ | |
1092 | long btrfs_ioctl_trans_end(struct file *file) | |
1093 | { | |
1094 | struct inode *inode = fdentry(file)->d_inode; | |
1095 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1096 | struct btrfs_trans_handle *trans; | |
1097 | int ret = 0; | |
1098 | ||
f46b5a66 CH |
1099 | trans = file->private_data; |
1100 | if (!trans) { | |
1101 | ret = -EINVAL; | |
1102 | goto out; | |
1103 | } | |
1104 | btrfs_end_transaction(trans, root); | |
b214107e | 1105 | file->private_data = NULL; |
9ca9ee09 SW |
1106 | |
1107 | mutex_lock(&root->fs_info->trans_mutex); | |
1108 | root->fs_info->open_ioctl_trans--; | |
1109 | mutex_unlock(&root->fs_info->trans_mutex); | |
1110 | ||
f46b5a66 | 1111 | out: |
f46b5a66 CH |
1112 | return ret; |
1113 | } | |
1114 | ||
1115 | long btrfs_ioctl(struct file *file, unsigned int | |
1116 | cmd, unsigned long arg) | |
1117 | { | |
1118 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; | |
1119 | ||
1120 | switch (cmd) { | |
1121 | case BTRFS_IOC_SNAP_CREATE: | |
3de4586c CM |
1122 | return btrfs_ioctl_snap_create(file, (void __user *)arg, 0); |
1123 | case BTRFS_IOC_SUBVOL_CREATE: | |
1124 | return btrfs_ioctl_snap_create(file, (void __user *)arg, 1); | |
f46b5a66 CH |
1125 | case BTRFS_IOC_DEFRAG: |
1126 | return btrfs_ioctl_defrag(file); | |
1127 | case BTRFS_IOC_RESIZE: | |
1128 | return btrfs_ioctl_resize(root, (void __user *)arg); | |
1129 | case BTRFS_IOC_ADD_DEV: | |
1130 | return btrfs_ioctl_add_dev(root, (void __user *)arg); | |
1131 | case BTRFS_IOC_RM_DEV: | |
1132 | return btrfs_ioctl_rm_dev(root, (void __user *)arg); | |
1133 | case BTRFS_IOC_BALANCE: | |
1134 | return btrfs_balance(root->fs_info->dev_root); | |
1135 | case BTRFS_IOC_CLONE: | |
c5c9cd4d SW |
1136 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
1137 | case BTRFS_IOC_CLONE_RANGE: | |
1138 | return btrfs_ioctl_clone_range(file, arg); | |
f46b5a66 CH |
1139 | case BTRFS_IOC_TRANS_START: |
1140 | return btrfs_ioctl_trans_start(file); | |
1141 | case BTRFS_IOC_TRANS_END: | |
1142 | return btrfs_ioctl_trans_end(file); | |
1143 | case BTRFS_IOC_SYNC: | |
ea8c2819 | 1144 | btrfs_start_delalloc_inodes(root); |
f46b5a66 CH |
1145 | btrfs_sync_fs(file->f_dentry->d_sb, 1); |
1146 | return 0; | |
1147 | } | |
1148 | ||
1149 | return -ENOTTY; | |
1150 | } |