blob: 6fb455802759ea268b2e2c0e9ce46e24a595e7cc [file] [log] [blame]
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001/*
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>
24#include <linux/pagemap.h>
25#include <linux/highmem.h>
26#include <linux/time.h>
27#include <linux/init.h>
28#include <linux/string.h>
29#include <linux/smp_lock.h>
30#include <linux/backing-dev.h>
31#include <linux/mpage.h>
32#include <linux/swap.h>
33#include <linux/writeback.h>
34#include <linux/statfs.h>
35#include <linux/compat.h>
36#include <linux/bit_spinlock.h>
37#include <linux/version.h>
38#include <linux/xattr.h>
39#include "ctree.h"
40#include "disk-io.h"
41#include "transaction.h"
42#include "btrfs_inode.h"
43#include "ioctl.h"
44#include "print-tree.h"
45#include "volumes.h"
46
47
48
49static noinline int create_subvol(struct btrfs_root *root, char *name,
50 int namelen)
51{
52 struct btrfs_trans_handle *trans;
53 struct btrfs_key key;
54 struct btrfs_root_item root_item;
55 struct btrfs_inode_item *inode_item;
56 struct extent_buffer *leaf;
57 struct btrfs_root *new_root = root;
58 struct inode *dir;
59 int ret;
60 int err;
61 u64 objectid;
62 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
63 unsigned long nr = 1;
64
65 mutex_lock(&root->fs_info->fs_mutex);
66 ret = btrfs_check_free_space(root, 1, 0);
67 if (ret)
68 goto fail_commit;
69
70 trans = btrfs_start_transaction(root, 1);
71 BUG_ON(!trans);
72
73 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
74 0, &objectid);
75 if (ret)
76 goto fail;
77
78 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
79 objectid, trans->transid, 0, 0,
80 0, 0);
81 if (IS_ERR(leaf))
82 return PTR_ERR(leaf);
83
84 btrfs_set_header_nritems(leaf, 0);
85 btrfs_set_header_level(leaf, 0);
86 btrfs_set_header_bytenr(leaf, leaf->start);
87 btrfs_set_header_generation(leaf, trans->transid);
88 btrfs_set_header_owner(leaf, objectid);
89
90 write_extent_buffer(leaf, root->fs_info->fsid,
91 (unsigned long)btrfs_header_fsid(leaf),
92 BTRFS_FSID_SIZE);
93 btrfs_mark_buffer_dirty(leaf);
94
95 inode_item = &root_item.inode;
96 memset(inode_item, 0, sizeof(*inode_item));
97 inode_item->generation = cpu_to_le64(1);
98 inode_item->size = cpu_to_le64(3);
99 inode_item->nlink = cpu_to_le32(1);
100 inode_item->nblocks = cpu_to_le64(1);
101 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
102
103 btrfs_set_root_bytenr(&root_item, leaf->start);
104 btrfs_set_root_level(&root_item, 0);
105 btrfs_set_root_refs(&root_item, 1);
106 btrfs_set_root_used(&root_item, 0);
107
108 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
109 root_item.drop_level = 0;
110
111 free_extent_buffer(leaf);
112 leaf = NULL;
113
114 btrfs_set_root_dirid(&root_item, new_dirid);
115
116 key.objectid = objectid;
117 key.offset = 1;
118 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
119 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
120 &root_item);
121 if (ret)
122 goto fail;
123
124 /*
125 * insert the directory item
126 */
127 key.offset = (u64)-1;
128 dir = root->fs_info->sb->s_root->d_inode;
129 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
130 name, namelen, dir->i_ino, &key,
131 BTRFS_FT_DIR);
132 if (ret)
133 goto fail;
134
135 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
136 name, namelen, objectid,
137 root->fs_info->sb->s_root->d_inode->i_ino);
138 if (ret)
139 goto fail;
140
141 ret = btrfs_commit_transaction(trans, root);
142 if (ret)
143 goto fail_commit;
144
145 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
146 BUG_ON(!new_root);
147
148 trans = btrfs_start_transaction(new_root, 1);
149 BUG_ON(!trans);
150
151 ret = btrfs_create_subvol_root(new_root, trans, new_dirid,
152 BTRFS_I(dir)->block_group);
153 if (ret)
154 goto fail;
155
156 /* Invalidate existing dcache entry for new subvolume. */
157 btrfs_invalidate_dcache_root(root, name, namelen);
158
159fail:
160 nr = trans->blocks_used;
161 err = btrfs_commit_transaction(trans, new_root);
162 if (err && !ret)
163 ret = err;
164fail_commit:
165 mutex_unlock(&root->fs_info->fs_mutex);
166 btrfs_btree_balance_dirty(root, nr);
167 btrfs_throttle(root);
168 return ret;
169}
170
171static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
172{
173 struct btrfs_pending_snapshot *pending_snapshot;
174 struct btrfs_trans_handle *trans;
175 int ret;
176 int err;
177 unsigned long nr = 0;
178
179 if (!root->ref_cows)
180 return -EINVAL;
181
182 mutex_lock(&root->fs_info->fs_mutex);
183 ret = btrfs_check_free_space(root, 1, 0);
184 if (ret)
185 goto fail_unlock;
186
187 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
188 if (!pending_snapshot) {
189 ret = -ENOMEM;
190 goto fail_unlock;
191 }
192 pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
193 if (!pending_snapshot->name) {
194 ret = -ENOMEM;
195 kfree(pending_snapshot);
196 goto fail_unlock;
197 }
198 memcpy(pending_snapshot->name, name, namelen);
199 pending_snapshot->name[namelen] = '\0';
200 trans = btrfs_start_transaction(root, 1);
201 BUG_ON(!trans);
202 pending_snapshot->root = root;
203 list_add(&pending_snapshot->list,
204 &trans->transaction->pending_snapshots);
205 ret = btrfs_update_inode(trans, root, root->inode);
206 err = btrfs_commit_transaction(trans, root);
207
208fail_unlock:
209 mutex_unlock(&root->fs_info->fs_mutex);
210 btrfs_btree_balance_dirty(root, nr);
211 btrfs_throttle(root);
212 return ret;
213}
214
215int btrfs_defrag_file(struct file *file)
216{
217 struct inode *inode = fdentry(file)->d_inode;
218 struct btrfs_root *root = BTRFS_I(inode)->root;
219 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
220 struct page *page;
221 unsigned long last_index;
222 unsigned long ra_pages = root->fs_info->bdi.ra_pages;
223 unsigned long total_read = 0;
224 u64 page_start;
225 u64 page_end;
226 unsigned long i;
227 int ret;
228
229 mutex_lock(&root->fs_info->fs_mutex);
230 ret = btrfs_check_free_space(root, inode->i_size, 0);
231 mutex_unlock(&root->fs_info->fs_mutex);
232 if (ret)
233 return -ENOSPC;
234
235 mutex_lock(&inode->i_mutex);
236 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
237 for (i = 0; i <= last_index; i++) {
238 if (total_read % ra_pages == 0) {
239 btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i,
240 min(last_index, i + ra_pages - 1));
241 }
242 total_read++;
243 page = grab_cache_page(inode->i_mapping, i);
244 if (!page)
245 goto out_unlock;
246 if (!PageUptodate(page)) {
247 btrfs_readpage(NULL, page);
248 lock_page(page);
249 if (!PageUptodate(page)) {
250 unlock_page(page);
251 page_cache_release(page);
252 goto out_unlock;
253 }
254 }
255
256#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
257 ClearPageDirty(page);
258#else
259 cancel_dirty_page(page, PAGE_CACHE_SIZE);
260#endif
261 wait_on_page_writeback(page);
262 set_page_extent_mapped(page);
263
264 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
265 page_end = page_start + PAGE_CACHE_SIZE - 1;
266
267 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
268 set_extent_delalloc(io_tree, page_start,
269 page_end, GFP_NOFS);
270
271 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
272 set_page_dirty(page);
273 unlock_page(page);
274 page_cache_release(page);
275 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
276 }
277
278out_unlock:
279 mutex_unlock(&inode->i_mutex);
280 return 0;
281}
282
283/*
284 * Called inside transaction, so use GFP_NOFS
285 */
286
287static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
288{
289 u64 new_size;
290 u64 old_size;
291 u64 devid = 1;
292 struct btrfs_ioctl_vol_args *vol_args;
293 struct btrfs_trans_handle *trans;
294 struct btrfs_device *device = NULL;
295 char *sizestr;
296 char *devstr = NULL;
297 int ret = 0;
298 int namelen;
299 int mod = 0;
300
301 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
302
303 if (!vol_args)
304 return -ENOMEM;
305
306 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
307 ret = -EFAULT;
308 goto out;
309 }
310 namelen = strlen(vol_args->name);
311 if (namelen > BTRFS_VOL_NAME_MAX) {
312 ret = -EINVAL;
313 goto out;
314 }
315
316 mutex_lock(&root->fs_info->fs_mutex);
317 sizestr = vol_args->name;
318 devstr = strchr(sizestr, ':');
319 if (devstr) {
320 char *end;
321 sizestr = devstr + 1;
322 *devstr = '\0';
323 devstr = vol_args->name;
324 devid = simple_strtoull(devstr, &end, 10);
325 printk(KERN_INFO "resizing devid %llu\n", devid);
326 }
327 device = btrfs_find_device(root, devid, NULL);
328 if (!device) {
329 printk(KERN_INFO "resizer unable to find device %llu\n", devid);
330 ret = -EINVAL;
331 goto out_unlock;
332 }
333 if (!strcmp(sizestr, "max"))
334 new_size = device->bdev->bd_inode->i_size;
335 else {
336 if (sizestr[0] == '-') {
337 mod = -1;
338 sizestr++;
339 } else if (sizestr[0] == '+') {
340 mod = 1;
341 sizestr++;
342 }
343 new_size = btrfs_parse_size(sizestr);
344 if (new_size == 0) {
345 ret = -EINVAL;
346 goto out_unlock;
347 }
348 }
349
350 old_size = device->total_bytes;
351
352 if (mod < 0) {
353 if (new_size > old_size) {
354 ret = -EINVAL;
355 goto out_unlock;
356 }
357 new_size = old_size - new_size;
358 } else if (mod > 0) {
359 new_size = old_size + new_size;
360 }
361
362 if (new_size < 256 * 1024 * 1024) {
363 ret = -EINVAL;
364 goto out_unlock;
365 }
366 if (new_size > device->bdev->bd_inode->i_size) {
367 ret = -EFBIG;
368 goto out_unlock;
369 }
370
371 do_div(new_size, root->sectorsize);
372 new_size *= root->sectorsize;
373
374 printk(KERN_INFO "new size for %s is %llu\n",
375 device->name, (unsigned long long)new_size);
376
377 if (new_size > old_size) {
378 trans = btrfs_start_transaction(root, 1);
379 ret = btrfs_grow_device(trans, device, new_size);
380 btrfs_commit_transaction(trans, root);
381 } else {
382 ret = btrfs_shrink_device(device, new_size);
383 }
384
385out_unlock:
386 mutex_unlock(&root->fs_info->fs_mutex);
387out:
388 kfree(vol_args);
389 return ret;
390}
391
392static noinline int btrfs_ioctl_snap_create(struct btrfs_root *root,
393 void __user *arg)
394{
395 struct btrfs_ioctl_vol_args *vol_args;
396 struct btrfs_dir_item *di;
397 struct btrfs_path *path;
398 u64 root_dirid;
399 int namelen;
400 int ret;
401
402 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
403
404 if (!vol_args)
405 return -ENOMEM;
406
407 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
408 ret = -EFAULT;
409 goto out;
410 }
411
412 namelen = strlen(vol_args->name);
413 if (namelen > BTRFS_VOL_NAME_MAX) {
414 ret = -EINVAL;
415 goto out;
416 }
417 if (strchr(vol_args->name, '/')) {
418 ret = -EINVAL;
419 goto out;
420 }
421
422 path = btrfs_alloc_path();
423 if (!path) {
424 ret = -ENOMEM;
425 goto out;
426 }
427
428 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
429 mutex_lock(&root->fs_info->fs_mutex);
430 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
431 path, root_dirid,
432 vol_args->name, namelen, 0);
433 mutex_unlock(&root->fs_info->fs_mutex);
434 btrfs_free_path(path);
435
436 if (di && !IS_ERR(di)) {
437 ret = -EEXIST;
438 goto out;
439 }
440
441 if (IS_ERR(di)) {
442 ret = PTR_ERR(di);
443 goto out;
444 }
445
446 if (root == root->fs_info->tree_root)
447 ret = create_subvol(root, vol_args->name, namelen);
448 else
449 ret = create_snapshot(root, vol_args->name, namelen);
450out:
451 kfree(vol_args);
452 return ret;
453}
454
455static int btrfs_ioctl_defrag(struct file *file)
456{
457 struct inode *inode = fdentry(file)->d_inode;
458 struct btrfs_root *root = BTRFS_I(inode)->root;
459
460 switch (inode->i_mode & S_IFMT) {
461 case S_IFDIR:
462 mutex_lock(&root->fs_info->fs_mutex);
463 btrfs_defrag_root(root, 0);
464 btrfs_defrag_root(root->fs_info->extent_root, 0);
465 mutex_unlock(&root->fs_info->fs_mutex);
466 break;
467 case S_IFREG:
468 btrfs_defrag_file(file);
469 break;
470 }
471
472 return 0;
473}
474
475long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
476{
477 struct btrfs_ioctl_vol_args *vol_args;
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 ret = btrfs_init_new_device(root, vol_args->name);
490
491out:
492 kfree(vol_args);
493 return ret;
494}
495
496long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
497{
498 struct btrfs_ioctl_vol_args *vol_args;
499 int ret;
500
501 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
502
503 if (!vol_args)
504 return -ENOMEM;
505
506 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
507 ret = -EFAULT;
508 goto out;
509 }
510 ret = btrfs_rm_device(root, vol_args->name);
511
512out:
513 kfree(vol_args);
514 return ret;
515}
516
517int dup_item_to_inode(struct btrfs_trans_handle *trans,
518 struct btrfs_root *root,
519 struct btrfs_path *path,
520 struct extent_buffer *leaf,
521 int slot,
522 struct btrfs_key *key,
523 u64 destino)
524{
525 char *dup;
526 int len = btrfs_item_size_nr(leaf, slot);
527 struct btrfs_key ckey = *key;
528 int ret = 0;
529
530 dup = kmalloc(len, GFP_NOFS);
531 if (!dup)
532 return -ENOMEM;
533
534 read_extent_buffer(leaf, dup, btrfs_item_ptr_offset(leaf, slot), len);
535 btrfs_release_path(root, path);
536
537 ckey.objectid = destino;
538 ret = btrfs_insert_item(trans, root, &ckey, dup, len);
539 kfree(dup);
540 return ret;
541}
542
543long btrfs_ioctl_clone(struct file *file, unsigned long src_fd)
544{
545 struct inode *inode = fdentry(file)->d_inode;
546 struct btrfs_root *root = BTRFS_I(inode)->root;
547 struct file *src_file;
548 struct inode *src;
549 struct btrfs_trans_handle *trans;
550 int ret;
551 u64 pos;
552 struct btrfs_path *path;
553 struct btrfs_key key;
554 struct extent_buffer *leaf;
555 u32 nritems;
556 int slot;
557
558 src_file = fget(src_fd);
559 if (!src_file)
560 return -EBADF;
561 src = src_file->f_dentry->d_inode;
562
563 ret = -EXDEV;
564 if (src->i_sb != inode->i_sb)
565 goto out_fput;
566
567 if (inode < src) {
568 mutex_lock(&inode->i_mutex);
569 mutex_lock(&src->i_mutex);
570 } else {
571 mutex_lock(&src->i_mutex);
572 mutex_lock(&inode->i_mutex);
573 }
574
575 ret = -ENOTEMPTY;
576 if (inode->i_size)
577 goto out_unlock;
578
579 /* do any pending delalloc/csum calc on src, one way or
580 another, and lock file content */
581 while (1) {
582 filemap_write_and_wait(src->i_mapping);
583 lock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
584 if (BTRFS_I(src)->delalloc_bytes == 0)
585 break;
586 unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
587 }
588
589 mutex_lock(&root->fs_info->fs_mutex);
590 trans = btrfs_start_transaction(root, 0);
591 path = btrfs_alloc_path();
592 if (!path) {
593 ret = -ENOMEM;
594 goto out;
595 }
596 key.offset = 0;
597 key.type = BTRFS_EXTENT_DATA_KEY;
598 key.objectid = src->i_ino;
599 pos = 0;
600 path->reada = 2;
601
602 while (1) {
603 /*
604 * note the key will change type as we walk through the
605 * tree.
606 */
607 ret = btrfs_search_slot(trans, root, &key, path, 0, 0);
608 if (ret < 0)
609 goto out;
610
611 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
612 ret = btrfs_next_leaf(root, path);
613 if (ret < 0)
614 goto out;
615 if (ret > 0)
616 break;
617 }
618 leaf = path->nodes[0];
619 slot = path->slots[0];
620 btrfs_item_key_to_cpu(leaf, &key, slot);
621 nritems = btrfs_header_nritems(leaf);
622
623 if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY ||
624 key.objectid != src->i_ino)
625 break;
626
627 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
628 struct btrfs_file_extent_item *extent;
629 int found_type;
630 pos = key.offset;
631 extent = btrfs_item_ptr(leaf, slot,
632 struct btrfs_file_extent_item);
633 found_type = btrfs_file_extent_type(leaf, extent);
634 if (found_type == BTRFS_FILE_EXTENT_REG) {
635 u64 len = btrfs_file_extent_num_bytes(leaf,
636 extent);
637 u64 ds = btrfs_file_extent_disk_bytenr(leaf,
638 extent);
639 u64 dl = btrfs_file_extent_disk_num_bytes(leaf,
640 extent);
641 u64 off = btrfs_file_extent_offset(leaf,
642 extent);
643 btrfs_insert_file_extent(trans, root,
644 inode->i_ino, pos,
645 ds, dl, len, off);
646 /* ds == 0 means there's a hole */
647 if (ds != 0) {
648 btrfs_inc_extent_ref(trans, root,
649 ds, dl,
650 root->root_key.objectid,
651 trans->transid,
652 inode->i_ino, pos);
653 }
654 pos = key.offset + len;
655 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
656 ret = dup_item_to_inode(trans, root, path,
657 leaf, slot, &key,
658 inode->i_ino);
659 if (ret)
660 goto out;
661 pos = key.offset + btrfs_item_size_nr(leaf,
662 slot);
663 }
664 } else if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) {
665 ret = dup_item_to_inode(trans, root, path, leaf,
666 slot, &key, inode->i_ino);
667
668 if (ret)
669 goto out;
670 }
671 key.offset++;
672 btrfs_release_path(root, path);
673 }
674
675 ret = 0;
676out:
677 btrfs_free_path(path);
678
679 inode->i_blocks = src->i_blocks;
680 i_size_write(inode, src->i_size);
681 btrfs_update_inode(trans, root, inode);
682
683 unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
684
685 btrfs_end_transaction(trans, root);
686 mutex_unlock(&root->fs_info->fs_mutex);
687
688out_unlock:
689 mutex_unlock(&src->i_mutex);
690 mutex_unlock(&inode->i_mutex);
691out_fput:
692 fput(src_file);
693 return ret;
694}
695
696/*
697 * there are many ways the trans_start and trans_end ioctls can lead
698 * to deadlocks. They should only be used by applications that
699 * basically own the machine, and have a very in depth understanding
700 * of all the possible deadlocks and enospc problems.
701 */
702long btrfs_ioctl_trans_start(struct file *file)
703{
704 struct inode *inode = fdentry(file)->d_inode;
705 struct btrfs_root *root = BTRFS_I(inode)->root;
706 struct btrfs_trans_handle *trans;
707 int ret = 0;
708
Christoph Hellwigdf5b5522008-06-11 21:53:58 -0400709 if (!capable(CAP_SYS_ADMIN))
710 return -EPERM;
711
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400712 mutex_lock(&root->fs_info->fs_mutex);
713 if (file->private_data) {
714 ret = -EINPROGRESS;
715 goto out;
716 }
717 trans = btrfs_start_transaction(root, 0);
718 if (trans)
719 file->private_data = trans;
720 else
721 ret = -ENOMEM;
722 /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/
723out:
724 mutex_unlock(&root->fs_info->fs_mutex);
725 return ret;
726}
727
728/*
729 * there are many ways the trans_start and trans_end ioctls can lead
730 * to deadlocks. They should only be used by applications that
731 * basically own the machine, and have a very in depth understanding
732 * of all the possible deadlocks and enospc problems.
733 */
734long btrfs_ioctl_trans_end(struct file *file)
735{
736 struct inode *inode = fdentry(file)->d_inode;
737 struct btrfs_root *root = BTRFS_I(inode)->root;
738 struct btrfs_trans_handle *trans;
739 int ret = 0;
740
741 mutex_lock(&root->fs_info->fs_mutex);
742 trans = file->private_data;
743 if (!trans) {
744 ret = -EINVAL;
745 goto out;
746 }
747 btrfs_end_transaction(trans, root);
748 file->private_data = 0;
749out:
750 mutex_unlock(&root->fs_info->fs_mutex);
751 return ret;
752}
753
754long btrfs_ioctl(struct file *file, unsigned int
755 cmd, unsigned long arg)
756{
757 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
758
759 switch (cmd) {
760 case BTRFS_IOC_SNAP_CREATE:
761 return btrfs_ioctl_snap_create(root, (void __user *)arg);
762 case BTRFS_IOC_DEFRAG:
763 return btrfs_ioctl_defrag(file);
764 case BTRFS_IOC_RESIZE:
765 return btrfs_ioctl_resize(root, (void __user *)arg);
766 case BTRFS_IOC_ADD_DEV:
767 return btrfs_ioctl_add_dev(root, (void __user *)arg);
768 case BTRFS_IOC_RM_DEV:
769 return btrfs_ioctl_rm_dev(root, (void __user *)arg);
770 case BTRFS_IOC_BALANCE:
771 return btrfs_balance(root->fs_info->dev_root);
772 case BTRFS_IOC_CLONE:
773 return btrfs_ioctl_clone(file, arg);
774 case BTRFS_IOC_TRANS_START:
775 return btrfs_ioctl_trans_start(file);
776 case BTRFS_IOC_TRANS_END:
777 return btrfs_ioctl_trans_end(file);
778 case BTRFS_IOC_SYNC:
779 btrfs_sync_fs(file->f_dentry->d_sb, 1);
780 return 0;
781 }
782
783 return -ENOTTY;
784}