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; | |
70 | unsigned long nr = 1; | |
71 | ||
f46b5a66 CH |
72 | ret = btrfs_check_free_space(root, 1, 0); |
73 | if (ret) | |
74 | goto fail_commit; | |
75 | ||
76 | trans = btrfs_start_transaction(root, 1); | |
77 | BUG_ON(!trans); | |
78 | ||
79 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
80 | 0, &objectid); | |
81 | if (ret) | |
82 | goto fail; | |
83 | ||
31840ae1 ZY |
84 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, |
85 | objectid, trans->transid, 0, 0, 0); | |
8e8a1e31 JB |
86 | if (IS_ERR(leaf)) { |
87 | ret = PTR_ERR(leaf); | |
88 | goto fail; | |
89 | } | |
f46b5a66 CH |
90 | |
91 | btrfs_set_header_nritems(leaf, 0); | |
92 | btrfs_set_header_level(leaf, 0); | |
93 | btrfs_set_header_bytenr(leaf, leaf->start); | |
94 | btrfs_set_header_generation(leaf, trans->transid); | |
95 | btrfs_set_header_owner(leaf, objectid); | |
96 | ||
97 | write_extent_buffer(leaf, root->fs_info->fsid, | |
98 | (unsigned long)btrfs_header_fsid(leaf), | |
99 | BTRFS_FSID_SIZE); | |
100 | btrfs_mark_buffer_dirty(leaf); | |
101 | ||
102 | inode_item = &root_item.inode; | |
103 | memset(inode_item, 0, sizeof(*inode_item)); | |
104 | inode_item->generation = cpu_to_le64(1); | |
105 | inode_item->size = cpu_to_le64(3); | |
106 | inode_item->nlink = cpu_to_le32(1); | |
a76a3cd4 | 107 | inode_item->nbytes = cpu_to_le64(root->leafsize); |
f46b5a66 CH |
108 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); |
109 | ||
110 | btrfs_set_root_bytenr(&root_item, leaf->start); | |
84234f3a | 111 | btrfs_set_root_generation(&root_item, trans->transid); |
f46b5a66 CH |
112 | btrfs_set_root_level(&root_item, 0); |
113 | btrfs_set_root_refs(&root_item, 1); | |
114 | btrfs_set_root_used(&root_item, 0); | |
115 | ||
116 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); | |
117 | root_item.drop_level = 0; | |
118 | ||
925baedd | 119 | btrfs_tree_unlock(leaf); |
f46b5a66 CH |
120 | free_extent_buffer(leaf); |
121 | leaf = NULL; | |
122 | ||
123 | btrfs_set_root_dirid(&root_item, new_dirid); | |
124 | ||
125 | key.objectid = objectid; | |
126 | key.offset = 1; | |
127 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
128 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
129 | &root_item); | |
130 | if (ret) | |
131 | goto fail; | |
132 | ||
133 | /* | |
134 | * insert the directory item | |
135 | */ | |
136 | key.offset = (u64)-1; | |
137 | dir = root->fs_info->sb->s_root->d_inode; | |
138 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
139 | name, namelen, dir->i_ino, &key, | |
aec7477b | 140 | BTRFS_FT_DIR, 0); |
f46b5a66 CH |
141 | if (ret) |
142 | goto fail; | |
143 | ||
144 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, | |
145 | name, namelen, objectid, | |
aec7477b | 146 | root->fs_info->sb->s_root->d_inode->i_ino, 0); |
f46b5a66 CH |
147 | if (ret) |
148 | goto fail; | |
149 | ||
150 | ret = btrfs_commit_transaction(trans, root); | |
151 | if (ret) | |
152 | goto fail_commit; | |
153 | ||
154 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); | |
155 | BUG_ON(!new_root); | |
156 | ||
157 | trans = btrfs_start_transaction(new_root, 1); | |
158 | BUG_ON(!trans); | |
159 | ||
cb8e7090 | 160 | ret = btrfs_create_subvol_root(new_root, dentry, trans, new_dirid, |
f46b5a66 CH |
161 | BTRFS_I(dir)->block_group); |
162 | if (ret) | |
163 | goto fail; | |
164 | ||
f46b5a66 CH |
165 | fail: |
166 | nr = trans->blocks_used; | |
167 | err = btrfs_commit_transaction(trans, new_root); | |
168 | if (err && !ret) | |
169 | ret = err; | |
170 | fail_commit: | |
f46b5a66 | 171 | btrfs_btree_balance_dirty(root, nr); |
f46b5a66 CH |
172 | return ret; |
173 | } | |
174 | ||
175 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
176 | { | |
177 | struct btrfs_pending_snapshot *pending_snapshot; | |
178 | struct btrfs_trans_handle *trans; | |
179 | int ret; | |
180 | int err; | |
181 | unsigned long nr = 0; | |
182 | ||
183 | if (!root->ref_cows) | |
184 | return -EINVAL; | |
185 | ||
f46b5a66 CH |
186 | ret = btrfs_check_free_space(root, 1, 0); |
187 | if (ret) | |
188 | goto fail_unlock; | |
189 | ||
190 | pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS); | |
191 | if (!pending_snapshot) { | |
192 | ret = -ENOMEM; | |
193 | goto fail_unlock; | |
194 | } | |
195 | pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); | |
196 | if (!pending_snapshot->name) { | |
197 | ret = -ENOMEM; | |
198 | kfree(pending_snapshot); | |
199 | goto fail_unlock; | |
200 | } | |
201 | memcpy(pending_snapshot->name, name, namelen); | |
202 | pending_snapshot->name[namelen] = '\0'; | |
203 | trans = btrfs_start_transaction(root, 1); | |
204 | BUG_ON(!trans); | |
205 | pending_snapshot->root = root; | |
206 | list_add(&pending_snapshot->list, | |
207 | &trans->transaction->pending_snapshots); | |
208 | ret = btrfs_update_inode(trans, root, root->inode); | |
209 | err = btrfs_commit_transaction(trans, root); | |
210 | ||
211 | fail_unlock: | |
f46b5a66 | 212 | btrfs_btree_balance_dirty(root, nr); |
f46b5a66 CH |
213 | return ret; |
214 | } | |
215 | ||
cb8e7090 CH |
216 | /* copy of may_create in fs/namei.c() */ |
217 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
218 | { | |
219 | if (child->d_inode) | |
220 | return -EEXIST; | |
221 | if (IS_DEADDIR(dir)) | |
222 | return -ENOENT; | |
223 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
224 | } | |
225 | ||
226 | /* | |
227 | * Create a new subvolume below @parent. This is largely modeled after | |
228 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
229 | * inside this filesystem so it's quite a bit simpler. | |
230 | */ | |
231 | static noinline int btrfs_mksubvol(struct path *parent, char *name, | |
232 | int mode, int namelen) | |
233 | { | |
234 | struct dentry *dentry; | |
235 | int error; | |
236 | ||
237 | mutex_lock_nested(&parent->dentry->d_inode->i_mutex, I_MUTEX_PARENT); | |
238 | ||
239 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
240 | error = PTR_ERR(dentry); | |
241 | if (IS_ERR(dentry)) | |
242 | goto out_unlock; | |
243 | ||
244 | error = -EEXIST; | |
245 | if (dentry->d_inode) | |
246 | goto out_dput; | |
247 | ||
248 | if (!IS_POSIXACL(parent->dentry->d_inode)) | |
249 | mode &= ~current->fs->umask; | |
250 | error = mnt_want_write(parent->mnt); | |
251 | if (error) | |
252 | goto out_dput; | |
253 | ||
254 | error = btrfs_may_create(parent->dentry->d_inode, dentry); | |
255 | if (error) | |
256 | goto out_drop_write; | |
257 | ||
cb8e7090 CH |
258 | /* |
259 | * Actually perform the low-level subvolume creation after all | |
260 | * this VFS fuzz. | |
261 | * | |
262 | * Eventually we want to pass in an inode under which we create this | |
263 | * subvolume, but for now all are under the filesystem root. | |
264 | * | |
265 | * Also we should pass on the mode eventually to allow creating new | |
266 | * subvolume with specific mode bits. | |
267 | */ | |
268 | error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root, dentry, | |
269 | name, namelen); | |
270 | if (error) | |
271 | goto out_drop_write; | |
272 | ||
273 | fsnotify_mkdir(parent->dentry->d_inode, dentry); | |
274 | out_drop_write: | |
275 | mnt_drop_write(parent->mnt); | |
276 | out_dput: | |
277 | dput(dentry); | |
278 | out_unlock: | |
279 | mutex_unlock(&parent->dentry->d_inode->i_mutex); | |
280 | return error; | |
281 | } | |
282 | ||
283 | ||
f46b5a66 CH |
284 | int btrfs_defrag_file(struct file *file) |
285 | { | |
286 | struct inode *inode = fdentry(file)->d_inode; | |
287 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
288 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
3eaa2885 | 289 | struct btrfs_ordered_extent *ordered; |
f46b5a66 CH |
290 | struct page *page; |
291 | unsigned long last_index; | |
292 | unsigned long ra_pages = root->fs_info->bdi.ra_pages; | |
293 | unsigned long total_read = 0; | |
294 | u64 page_start; | |
295 | u64 page_end; | |
296 | unsigned long i; | |
297 | int ret; | |
298 | ||
f46b5a66 | 299 | ret = btrfs_check_free_space(root, inode->i_size, 0); |
f46b5a66 CH |
300 | if (ret) |
301 | return -ENOSPC; | |
302 | ||
303 | mutex_lock(&inode->i_mutex); | |
304 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
305 | for (i = 0; i <= last_index; i++) { | |
306 | if (total_read % ra_pages == 0) { | |
307 | btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, | |
308 | min(last_index, i + ra_pages - 1)); | |
309 | } | |
310 | total_read++; | |
3eaa2885 | 311 | again: |
f46b5a66 CH |
312 | page = grab_cache_page(inode->i_mapping, i); |
313 | if (!page) | |
314 | goto out_unlock; | |
315 | if (!PageUptodate(page)) { | |
316 | btrfs_readpage(NULL, page); | |
317 | lock_page(page); | |
318 | if (!PageUptodate(page)) { | |
319 | unlock_page(page); | |
320 | page_cache_release(page); | |
321 | goto out_unlock; | |
322 | } | |
323 | } | |
324 | ||
f46b5a66 | 325 | wait_on_page_writeback(page); |
f46b5a66 CH |
326 | |
327 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; | |
328 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
f46b5a66 | 329 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
3eaa2885 CM |
330 | |
331 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
332 | if (ordered) { | |
333 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
334 | unlock_page(page); | |
335 | page_cache_release(page); | |
336 | btrfs_start_ordered_extent(inode, ordered, 1); | |
337 | btrfs_put_ordered_extent(ordered); | |
338 | goto again; | |
339 | } | |
340 | set_page_extent_mapped(page); | |
341 | ||
f87f057b CM |
342 | /* |
343 | * this makes sure page_mkwrite is called on the | |
344 | * page if it is dirtied again later | |
345 | */ | |
346 | clear_page_dirty_for_io(page); | |
347 | ||
ea8c2819 | 348 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
f46b5a66 CH |
349 | |
350 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
351 | set_page_dirty(page); | |
352 | unlock_page(page); | |
353 | page_cache_release(page); | |
354 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
355 | } | |
356 | ||
357 | out_unlock: | |
358 | mutex_unlock(&inode->i_mutex); | |
359 | return 0; | |
360 | } | |
361 | ||
362 | /* | |
363 | * Called inside transaction, so use GFP_NOFS | |
364 | */ | |
365 | ||
366 | static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) | |
367 | { | |
368 | u64 new_size; | |
369 | u64 old_size; | |
370 | u64 devid = 1; | |
371 | struct btrfs_ioctl_vol_args *vol_args; | |
372 | struct btrfs_trans_handle *trans; | |
373 | struct btrfs_device *device = NULL; | |
374 | char *sizestr; | |
375 | char *devstr = NULL; | |
376 | int ret = 0; | |
377 | int namelen; | |
378 | int mod = 0; | |
379 | ||
380 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); | |
381 | ||
382 | if (!vol_args) | |
383 | return -ENOMEM; | |
384 | ||
385 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
386 | ret = -EFAULT; | |
387 | goto out; | |
388 | } | |
5516e595 MF |
389 | |
390 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 391 | namelen = strlen(vol_args->name); |
f46b5a66 | 392 | |
7d9eb12c | 393 | mutex_lock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
394 | sizestr = vol_args->name; |
395 | devstr = strchr(sizestr, ':'); | |
396 | if (devstr) { | |
397 | char *end; | |
398 | sizestr = devstr + 1; | |
399 | *devstr = '\0'; | |
400 | devstr = vol_args->name; | |
401 | devid = simple_strtoull(devstr, &end, 10); | |
402 | printk(KERN_INFO "resizing devid %llu\n", devid); | |
403 | } | |
404 | device = btrfs_find_device(root, devid, NULL); | |
405 | if (!device) { | |
406 | printk(KERN_INFO "resizer unable to find device %llu\n", devid); | |
407 | ret = -EINVAL; | |
408 | goto out_unlock; | |
409 | } | |
410 | if (!strcmp(sizestr, "max")) | |
411 | new_size = device->bdev->bd_inode->i_size; | |
412 | else { | |
413 | if (sizestr[0] == '-') { | |
414 | mod = -1; | |
415 | sizestr++; | |
416 | } else if (sizestr[0] == '+') { | |
417 | mod = 1; | |
418 | sizestr++; | |
419 | } | |
420 | new_size = btrfs_parse_size(sizestr); | |
421 | if (new_size == 0) { | |
422 | ret = -EINVAL; | |
423 | goto out_unlock; | |
424 | } | |
425 | } | |
426 | ||
427 | old_size = device->total_bytes; | |
428 | ||
429 | if (mod < 0) { | |
430 | if (new_size > old_size) { | |
431 | ret = -EINVAL; | |
432 | goto out_unlock; | |
433 | } | |
434 | new_size = old_size - new_size; | |
435 | } else if (mod > 0) { | |
436 | new_size = old_size + new_size; | |
437 | } | |
438 | ||
439 | if (new_size < 256 * 1024 * 1024) { | |
440 | ret = -EINVAL; | |
441 | goto out_unlock; | |
442 | } | |
443 | if (new_size > device->bdev->bd_inode->i_size) { | |
444 | ret = -EFBIG; | |
445 | goto out_unlock; | |
446 | } | |
447 | ||
448 | do_div(new_size, root->sectorsize); | |
449 | new_size *= root->sectorsize; | |
450 | ||
451 | printk(KERN_INFO "new size for %s is %llu\n", | |
452 | device->name, (unsigned long long)new_size); | |
453 | ||
454 | if (new_size > old_size) { | |
455 | trans = btrfs_start_transaction(root, 1); | |
456 | ret = btrfs_grow_device(trans, device, new_size); | |
457 | btrfs_commit_transaction(trans, root); | |
458 | } else { | |
459 | ret = btrfs_shrink_device(device, new_size); | |
460 | } | |
461 | ||
462 | out_unlock: | |
7d9eb12c | 463 | mutex_unlock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
464 | out: |
465 | kfree(vol_args); | |
466 | return ret; | |
467 | } | |
468 | ||
cb8e7090 | 469 | static noinline int btrfs_ioctl_snap_create(struct file *file, |
f46b5a66 CH |
470 | void __user *arg) |
471 | { | |
cb8e7090 | 472 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
f46b5a66 CH |
473 | struct btrfs_ioctl_vol_args *vol_args; |
474 | struct btrfs_dir_item *di; | |
475 | struct btrfs_path *path; | |
476 | u64 root_dirid; | |
477 | int namelen; | |
478 | int ret; | |
479 | ||
480 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); | |
481 | ||
482 | if (!vol_args) | |
483 | return -ENOMEM; | |
484 | ||
485 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
486 | ret = -EFAULT; | |
487 | goto out; | |
488 | } | |
489 | ||
5516e595 | 490 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 | 491 | namelen = strlen(vol_args->name); |
f46b5a66 CH |
492 | if (strchr(vol_args->name, '/')) { |
493 | ret = -EINVAL; | |
494 | goto out; | |
495 | } | |
496 | ||
497 | path = btrfs_alloc_path(); | |
498 | if (!path) { | |
499 | ret = -ENOMEM; | |
500 | goto out; | |
501 | } | |
502 | ||
503 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
f46b5a66 CH |
504 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, |
505 | path, root_dirid, | |
506 | vol_args->name, namelen, 0); | |
f46b5a66 CH |
507 | btrfs_free_path(path); |
508 | ||
509 | if (di && !IS_ERR(di)) { | |
510 | ret = -EEXIST; | |
511 | goto out; | |
512 | } | |
513 | ||
514 | if (IS_ERR(di)) { | |
515 | ret = PTR_ERR(di); | |
516 | goto out; | |
517 | } | |
518 | ||
cb8e7090 CH |
519 | if (root == root->fs_info->tree_root) { |
520 | ret = btrfs_mksubvol(&file->f_path, vol_args->name, | |
521 | file->f_path.dentry->d_inode->i_mode, | |
522 | namelen); | |
523 | } else { | |
f46b5a66 | 524 | ret = create_snapshot(root, vol_args->name, namelen); |
cb8e7090 CH |
525 | } |
526 | ||
f46b5a66 CH |
527 | out: |
528 | kfree(vol_args); | |
529 | return ret; | |
530 | } | |
531 | ||
532 | static int btrfs_ioctl_defrag(struct file *file) | |
533 | { | |
534 | struct inode *inode = fdentry(file)->d_inode; | |
535 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
536 | ||
537 | switch (inode->i_mode & S_IFMT) { | |
538 | case S_IFDIR: | |
f46b5a66 CH |
539 | btrfs_defrag_root(root, 0); |
540 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
f46b5a66 CH |
541 | break; |
542 | case S_IFREG: | |
543 | btrfs_defrag_file(file); | |
544 | break; | |
545 | } | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
550 | long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) | |
551 | { | |
552 | struct btrfs_ioctl_vol_args *vol_args; | |
553 | int ret; | |
554 | ||
555 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); | |
556 | ||
557 | if (!vol_args) | |
558 | return -ENOMEM; | |
559 | ||
560 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
561 | ret = -EFAULT; | |
562 | goto out; | |
563 | } | |
5516e595 | 564 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
565 | ret = btrfs_init_new_device(root, vol_args->name); |
566 | ||
567 | out: | |
568 | kfree(vol_args); | |
569 | return ret; | |
570 | } | |
571 | ||
572 | long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) | |
573 | { | |
574 | struct btrfs_ioctl_vol_args *vol_args; | |
575 | int ret; | |
576 | ||
577 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); | |
578 | ||
579 | if (!vol_args) | |
580 | return -ENOMEM; | |
581 | ||
582 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
583 | ret = -EFAULT; | |
584 | goto out; | |
585 | } | |
5516e595 | 586 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
587 | ret = btrfs_rm_device(root, vol_args->name); |
588 | ||
589 | out: | |
590 | kfree(vol_args); | |
591 | return ret; | |
592 | } | |
593 | ||
f46b5a66 CH |
594 | long btrfs_ioctl_clone(struct file *file, unsigned long src_fd) |
595 | { | |
596 | struct inode *inode = fdentry(file)->d_inode; | |
597 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
598 | struct file *src_file; | |
599 | struct inode *src; | |
600 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 601 | struct btrfs_path *path; |
f46b5a66 | 602 | struct extent_buffer *leaf; |
ae01a0ab YZ |
603 | char *buf; |
604 | struct btrfs_key key; | |
f46b5a66 CH |
605 | u32 nritems; |
606 | int slot; | |
ae01a0ab | 607 | int ret; |
f46b5a66 CH |
608 | |
609 | src_file = fget(src_fd); | |
610 | if (!src_file) | |
611 | return -EBADF; | |
612 | src = src_file->f_dentry->d_inode; | |
613 | ||
ae01a0ab YZ |
614 | ret = -EISDIR; |
615 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) | |
616 | goto out_fput; | |
617 | ||
f46b5a66 | 618 | ret = -EXDEV; |
ae01a0ab YZ |
619 | if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) |
620 | goto out_fput; | |
621 | ||
622 | ret = -ENOMEM; | |
623 | buf = vmalloc(btrfs_level_size(root, 0)); | |
624 | if (!buf) | |
625 | goto out_fput; | |
626 | ||
627 | path = btrfs_alloc_path(); | |
628 | if (!path) { | |
629 | vfree(buf); | |
f46b5a66 | 630 | goto out_fput; |
ae01a0ab YZ |
631 | } |
632 | path->reada = 2; | |
f46b5a66 CH |
633 | |
634 | if (inode < src) { | |
635 | mutex_lock(&inode->i_mutex); | |
636 | mutex_lock(&src->i_mutex); | |
637 | } else { | |
638 | mutex_lock(&src->i_mutex); | |
639 | mutex_lock(&inode->i_mutex); | |
640 | } | |
641 | ||
642 | ret = -ENOTEMPTY; | |
643 | if (inode->i_size) | |
644 | goto out_unlock; | |
645 | ||
646 | /* do any pending delalloc/csum calc on src, one way or | |
647 | another, and lock file content */ | |
648 | while (1) { | |
31840ae1 | 649 | struct btrfs_ordered_extent *ordered; |
f46b5a66 | 650 | lock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS); |
ae01a0ab YZ |
651 | ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1); |
652 | if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) | |
f46b5a66 CH |
653 | break; |
654 | unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS); | |
ae01a0ab YZ |
655 | if (ordered) |
656 | btrfs_put_ordered_extent(ordered); | |
657 | btrfs_wait_ordered_range(src, 0, (u64)-1); | |
f46b5a66 CH |
658 | } |
659 | ||
ae01a0ab YZ |
660 | trans = btrfs_start_transaction(root, 1); |
661 | BUG_ON(!trans); | |
662 | ||
f46b5a66 | 663 | key.objectid = src->i_ino; |
ae01a0ab YZ |
664 | key.type = BTRFS_EXTENT_DATA_KEY; |
665 | key.offset = 0; | |
f46b5a66 CH |
666 | |
667 | while (1) { | |
668 | /* | |
669 | * note the key will change type as we walk through the | |
670 | * tree. | |
671 | */ | |
672 | ret = btrfs_search_slot(trans, root, &key, path, 0, 0); | |
673 | if (ret < 0) | |
674 | goto out; | |
675 | ||
ae01a0ab YZ |
676 | nritems = btrfs_header_nritems(path->nodes[0]); |
677 | if (path->slots[0] >= nritems) { | |
f46b5a66 CH |
678 | ret = btrfs_next_leaf(root, path); |
679 | if (ret < 0) | |
680 | goto out; | |
681 | if (ret > 0) | |
682 | break; | |
ae01a0ab | 683 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
684 | } |
685 | leaf = path->nodes[0]; | |
686 | slot = path->slots[0]; | |
f46b5a66 | 687 | |
ae01a0ab | 688 | btrfs_item_key_to_cpu(leaf, &key, slot); |
f46b5a66 CH |
689 | if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY || |
690 | key.objectid != src->i_ino) | |
691 | break; | |
692 | ||
31840ae1 ZY |
693 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY || |
694 | btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) { | |
695 | u32 size; | |
696 | struct btrfs_key new_key; | |
697 | ||
698 | size = btrfs_item_size_nr(leaf, slot); | |
699 | read_extent_buffer(leaf, buf, | |
700 | btrfs_item_ptr_offset(leaf, slot), | |
701 | size); | |
702 | btrfs_release_path(root, path); | |
703 | ||
704 | memcpy(&new_key, &key, sizeof(new_key)); | |
705 | new_key.objectid = inode->i_ino; | |
706 | ret = btrfs_insert_empty_item(trans, root, path, | |
707 | &new_key, size); | |
708 | if (ret) | |
709 | goto out; | |
710 | ||
711 | leaf = path->nodes[0]; | |
712 | slot = path->slots[0]; | |
713 | write_extent_buffer(leaf, buf, | |
714 | btrfs_item_ptr_offset(leaf, slot), | |
715 | size); | |
716 | btrfs_mark_buffer_dirty(leaf); | |
717 | } | |
718 | ||
f46b5a66 CH |
719 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
720 | struct btrfs_file_extent_item *extent; | |
721 | int found_type; | |
ae01a0ab | 722 | |
f46b5a66 CH |
723 | extent = btrfs_item_ptr(leaf, slot, |
724 | struct btrfs_file_extent_item); | |
725 | found_type = btrfs_file_extent_type(leaf, extent); | |
726 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
f46b5a66 CH |
727 | u64 ds = btrfs_file_extent_disk_bytenr(leaf, |
728 | extent); | |
729 | u64 dl = btrfs_file_extent_disk_num_bytes(leaf, | |
730 | extent); | |
f46b5a66 CH |
731 | /* ds == 0 means there's a hole */ |
732 | if (ds != 0) { | |
ae01a0ab | 733 | ret = btrfs_inc_extent_ref(trans, root, |
31840ae1 | 734 | ds, dl, leaf->start, |
f46b5a66 CH |
735 | root->root_key.objectid, |
736 | trans->transid, | |
3bb1a1bc | 737 | inode->i_ino); |
31840ae1 | 738 | BUG_ON(ret); |
f46b5a66 | 739 | } |
f46b5a66 | 740 | } |
ae01a0ab | 741 | } |
31840ae1 | 742 | btrfs_release_path(root, path); |
f46b5a66 | 743 | key.offset++; |
f46b5a66 | 744 | } |
f46b5a66 CH |
745 | ret = 0; |
746 | out: | |
ae01a0ab YZ |
747 | btrfs_release_path(root, path); |
748 | if (ret == 0) { | |
749 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
a76a3cd4 | 750 | inode_set_bytes(inode, inode_get_bytes(src)); |
ae01a0ab YZ |
751 | btrfs_i_size_write(inode, src->i_size); |
752 | BTRFS_I(inode)->flags = BTRFS_I(src)->flags; | |
753 | ret = btrfs_update_inode(trans, root, inode); | |
754 | } | |
f46b5a66 | 755 | btrfs_end_transaction(trans, root); |
ae01a0ab YZ |
756 | unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS); |
757 | if (ret) | |
758 | vmtruncate(inode, 0); | |
f46b5a66 CH |
759 | out_unlock: |
760 | mutex_unlock(&src->i_mutex); | |
761 | mutex_unlock(&inode->i_mutex); | |
ae01a0ab YZ |
762 | vfree(buf); |
763 | btrfs_free_path(path); | |
f46b5a66 CH |
764 | out_fput: |
765 | fput(src_file); | |
766 | return ret; | |
767 | } | |
768 | ||
769 | /* | |
770 | * there are many ways the trans_start and trans_end ioctls can lead | |
771 | * to deadlocks. They should only be used by applications that | |
772 | * basically own the machine, and have a very in depth understanding | |
773 | * of all the possible deadlocks and enospc problems. | |
774 | */ | |
775 | long btrfs_ioctl_trans_start(struct file *file) | |
776 | { | |
777 | struct inode *inode = fdentry(file)->d_inode; | |
778 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
779 | struct btrfs_trans_handle *trans; | |
780 | int ret = 0; | |
781 | ||
df5b5520 CH |
782 | if (!capable(CAP_SYS_ADMIN)) |
783 | return -EPERM; | |
784 | ||
f46b5a66 CH |
785 | if (file->private_data) { |
786 | ret = -EINPROGRESS; | |
787 | goto out; | |
788 | } | |
9ca9ee09 SW |
789 | |
790 | mutex_lock(&root->fs_info->trans_mutex); | |
791 | root->fs_info->open_ioctl_trans++; | |
792 | mutex_unlock(&root->fs_info->trans_mutex); | |
793 | ||
794 | trans = btrfs_start_ioctl_transaction(root, 0); | |
f46b5a66 CH |
795 | if (trans) |
796 | file->private_data = trans; | |
797 | else | |
798 | ret = -ENOMEM; | |
799 | /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/ | |
800 | out: | |
f46b5a66 CH |
801 | return ret; |
802 | } | |
803 | ||
804 | /* | |
805 | * there are many ways the trans_start and trans_end ioctls can lead | |
806 | * to deadlocks. They should only be used by applications that | |
807 | * basically own the machine, and have a very in depth understanding | |
808 | * of all the possible deadlocks and enospc problems. | |
809 | */ | |
810 | long btrfs_ioctl_trans_end(struct file *file) | |
811 | { | |
812 | struct inode *inode = fdentry(file)->d_inode; | |
813 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
814 | struct btrfs_trans_handle *trans; | |
815 | int ret = 0; | |
816 | ||
f46b5a66 CH |
817 | trans = file->private_data; |
818 | if (!trans) { | |
819 | ret = -EINVAL; | |
820 | goto out; | |
821 | } | |
822 | btrfs_end_transaction(trans, root); | |
b214107e | 823 | file->private_data = NULL; |
9ca9ee09 SW |
824 | |
825 | mutex_lock(&root->fs_info->trans_mutex); | |
826 | root->fs_info->open_ioctl_trans--; | |
827 | mutex_unlock(&root->fs_info->trans_mutex); | |
828 | ||
f46b5a66 | 829 | out: |
f46b5a66 CH |
830 | return ret; |
831 | } | |
832 | ||
833 | long btrfs_ioctl(struct file *file, unsigned int | |
834 | cmd, unsigned long arg) | |
835 | { | |
836 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; | |
837 | ||
838 | switch (cmd) { | |
839 | case BTRFS_IOC_SNAP_CREATE: | |
cb8e7090 | 840 | return btrfs_ioctl_snap_create(file, (void __user *)arg); |
f46b5a66 CH |
841 | case BTRFS_IOC_DEFRAG: |
842 | return btrfs_ioctl_defrag(file); | |
843 | case BTRFS_IOC_RESIZE: | |
844 | return btrfs_ioctl_resize(root, (void __user *)arg); | |
845 | case BTRFS_IOC_ADD_DEV: | |
846 | return btrfs_ioctl_add_dev(root, (void __user *)arg); | |
847 | case BTRFS_IOC_RM_DEV: | |
848 | return btrfs_ioctl_rm_dev(root, (void __user *)arg); | |
849 | case BTRFS_IOC_BALANCE: | |
850 | return btrfs_balance(root->fs_info->dev_root); | |
851 | case BTRFS_IOC_CLONE: | |
852 | return btrfs_ioctl_clone(file, arg); | |
853 | case BTRFS_IOC_TRANS_START: | |
854 | return btrfs_ioctl_trans_start(file); | |
855 | case BTRFS_IOC_TRANS_END: | |
856 | return btrfs_ioctl_trans_end(file); | |
857 | case BTRFS_IOC_SYNC: | |
ea8c2819 | 858 | btrfs_start_delalloc_inodes(root); |
f46b5a66 CH |
859 | btrfs_sync_fs(file->f_dentry->d_sb, 1); |
860 | return 0; | |
861 | } | |
862 | ||
863 | return -ENOTTY; | |
864 | } |