blob: e1046a54b1c542787bd5e9653fcd34a43bf86cf6 [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"
Chris Mason925baed2008-06-25 16:01:30 -040046#include "locking.h"
Christoph Hellwigf46b5a62008-06-11 21:53:53 -040047
48
49
50static noinline int create_subvol(struct btrfs_root *root, char *name,
51 int namelen)
52{
53 struct btrfs_trans_handle *trans;
54 struct btrfs_key key;
55 struct btrfs_root_item root_item;
56 struct btrfs_inode_item *inode_item;
57 struct extent_buffer *leaf;
58 struct btrfs_root *new_root = root;
59 struct inode *dir;
60 int ret;
61 int err;
62 u64 objectid;
63 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
64 unsigned long nr = 1;
65
Christoph Hellwigf46b5a62008-06-11 21:53:53 -040066 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
Chris Mason925baed2008-06-25 16:01:30 -040078 leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
79 objectid, trans->transid, 0, 0,
80 0, 0);
Josef Bacik8e8a1e32008-07-24 12:17:14 -040081 if (IS_ERR(leaf)) {
82 ret = PTR_ERR(leaf);
83 goto fail;
84 }
Christoph Hellwigf46b5a62008-06-11 21:53:53 -040085
86 btrfs_set_header_nritems(leaf, 0);
87 btrfs_set_header_level(leaf, 0);
88 btrfs_set_header_bytenr(leaf, leaf->start);
89 btrfs_set_header_generation(leaf, trans->transid);
90 btrfs_set_header_owner(leaf, objectid);
91
92 write_extent_buffer(leaf, root->fs_info->fsid,
93 (unsigned long)btrfs_header_fsid(leaf),
94 BTRFS_FSID_SIZE);
95 btrfs_mark_buffer_dirty(leaf);
96
97 inode_item = &root_item.inode;
98 memset(inode_item, 0, sizeof(*inode_item));
99 inode_item->generation = cpu_to_le64(1);
100 inode_item->size = cpu_to_le64(3);
101 inode_item->nlink = cpu_to_le32(1);
102 inode_item->nblocks = cpu_to_le64(1);
103 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
104
105 btrfs_set_root_bytenr(&root_item, leaf->start);
106 btrfs_set_root_level(&root_item, 0);
107 btrfs_set_root_refs(&root_item, 1);
108 btrfs_set_root_used(&root_item, 0);
109
110 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
111 root_item.drop_level = 0;
112
Chris Mason925baed2008-06-25 16:01:30 -0400113 btrfs_tree_unlock(leaf);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400114 free_extent_buffer(leaf);
115 leaf = NULL;
116
117 btrfs_set_root_dirid(&root_item, new_dirid);
118
119 key.objectid = objectid;
120 key.offset = 1;
121 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
122 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
123 &root_item);
124 if (ret)
125 goto fail;
126
127 /*
128 * insert the directory item
129 */
130 key.offset = (u64)-1;
131 dir = root->fs_info->sb->s_root->d_inode;
132 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
133 name, namelen, dir->i_ino, &key,
Josef Bacikaec74772008-07-24 12:12:38 -0400134 BTRFS_FT_DIR, 0);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400135 if (ret)
136 goto fail;
137
138 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
139 name, namelen, objectid,
Josef Bacikaec74772008-07-24 12:12:38 -0400140 root->fs_info->sb->s_root->d_inode->i_ino, 0);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400141 if (ret)
142 goto fail;
143
144 ret = btrfs_commit_transaction(trans, root);
145 if (ret)
146 goto fail_commit;
147
148 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
149 BUG_ON(!new_root);
150
151 trans = btrfs_start_transaction(new_root, 1);
152 BUG_ON(!trans);
153
154 ret = btrfs_create_subvol_root(new_root, trans, new_dirid,
155 BTRFS_I(dir)->block_group);
156 if (ret)
157 goto fail;
158
159 /* Invalidate existing dcache entry for new subvolume. */
160 btrfs_invalidate_dcache_root(root, name, namelen);
161
162fail:
163 nr = trans->blocks_used;
164 err = btrfs_commit_transaction(trans, new_root);
165 if (err && !ret)
166 ret = err;
167fail_commit:
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400168 btrfs_btree_balance_dirty(root, nr);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400169 return ret;
170}
171
172static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
173{
174 struct btrfs_pending_snapshot *pending_snapshot;
175 struct btrfs_trans_handle *trans;
176 int ret;
177 int err;
178 unsigned long nr = 0;
179
180 if (!root->ref_cows)
181 return -EINVAL;
182
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400183 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:
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400209 btrfs_btree_balance_dirty(root, nr);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400210 return ret;
211}
212
213int btrfs_defrag_file(struct file *file)
214{
215 struct inode *inode = fdentry(file)->d_inode;
216 struct btrfs_root *root = BTRFS_I(inode)->root;
217 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
Chris Mason3eaa2882008-07-24 11:57:52 -0400218 struct btrfs_ordered_extent *ordered;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400219 struct page *page;
220 unsigned long last_index;
221 unsigned long ra_pages = root->fs_info->bdi.ra_pages;
222 unsigned long total_read = 0;
223 u64 page_start;
224 u64 page_end;
225 unsigned long i;
226 int ret;
227
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400228 ret = btrfs_check_free_space(root, inode->i_size, 0);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400229 if (ret)
230 return -ENOSPC;
231
232 mutex_lock(&inode->i_mutex);
233 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
234 for (i = 0; i <= last_index; i++) {
235 if (total_read % ra_pages == 0) {
236 btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i,
237 min(last_index, i + ra_pages - 1));
238 }
239 total_read++;
Chris Mason3eaa2882008-07-24 11:57:52 -0400240again:
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400241 page = grab_cache_page(inode->i_mapping, i);
242 if (!page)
243 goto out_unlock;
244 if (!PageUptodate(page)) {
245 btrfs_readpage(NULL, page);
246 lock_page(page);
247 if (!PageUptodate(page)) {
248 unlock_page(page);
249 page_cache_release(page);
250 goto out_unlock;
251 }
252 }
253
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400254 wait_on_page_writeback(page);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400255
256 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
257 page_end = page_start + PAGE_CACHE_SIZE - 1;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400258 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
Chris Mason3eaa2882008-07-24 11:57:52 -0400259
260 ordered = btrfs_lookup_ordered_extent(inode, page_start);
261 if (ordered) {
262 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
263 unlock_page(page);
264 page_cache_release(page);
265 btrfs_start_ordered_extent(inode, ordered, 1);
266 btrfs_put_ordered_extent(ordered);
267 goto again;
268 }
269 set_page_extent_mapped(page);
270
Chris Masonf87f0572008-08-01 11:27:23 -0400271 /*
272 * this makes sure page_mkwrite is called on the
273 * page if it is dirtied again later
274 */
275 clear_page_dirty_for_io(page);
276
Chris Masonea8c2812008-08-04 23:17:27 -0400277 btrfs_set_extent_delalloc(inode, page_start, page_end);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400278
279 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
280 set_page_dirty(page);
281 unlock_page(page);
282 page_cache_release(page);
283 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
284 }
285
286out_unlock:
287 mutex_unlock(&inode->i_mutex);
288 return 0;
289}
290
291/*
292 * Called inside transaction, so use GFP_NOFS
293 */
294
295static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
296{
297 u64 new_size;
298 u64 old_size;
299 u64 devid = 1;
300 struct btrfs_ioctl_vol_args *vol_args;
301 struct btrfs_trans_handle *trans;
302 struct btrfs_device *device = NULL;
303 char *sizestr;
304 char *devstr = NULL;
305 int ret = 0;
306 int namelen;
307 int mod = 0;
308
309 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
310
311 if (!vol_args)
312 return -ENOMEM;
313
314 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
315 ret = -EFAULT;
316 goto out;
317 }
Mark Fasheh5516e592008-07-24 12:20:14 -0400318
319 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400320 namelen = strlen(vol_args->name);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400321
Chris Mason7d9eb122008-07-08 14:19:17 -0400322 mutex_lock(&root->fs_info->volume_mutex);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400323 sizestr = vol_args->name;
324 devstr = strchr(sizestr, ':');
325 if (devstr) {
326 char *end;
327 sizestr = devstr + 1;
328 *devstr = '\0';
329 devstr = vol_args->name;
330 devid = simple_strtoull(devstr, &end, 10);
331 printk(KERN_INFO "resizing devid %llu\n", devid);
332 }
333 device = btrfs_find_device(root, devid, NULL);
334 if (!device) {
335 printk(KERN_INFO "resizer unable to find device %llu\n", devid);
336 ret = -EINVAL;
337 goto out_unlock;
338 }
339 if (!strcmp(sizestr, "max"))
340 new_size = device->bdev->bd_inode->i_size;
341 else {
342 if (sizestr[0] == '-') {
343 mod = -1;
344 sizestr++;
345 } else if (sizestr[0] == '+') {
346 mod = 1;
347 sizestr++;
348 }
349 new_size = btrfs_parse_size(sizestr);
350 if (new_size == 0) {
351 ret = -EINVAL;
352 goto out_unlock;
353 }
354 }
355
356 old_size = device->total_bytes;
357
358 if (mod < 0) {
359 if (new_size > old_size) {
360 ret = -EINVAL;
361 goto out_unlock;
362 }
363 new_size = old_size - new_size;
364 } else if (mod > 0) {
365 new_size = old_size + new_size;
366 }
367
368 if (new_size < 256 * 1024 * 1024) {
369 ret = -EINVAL;
370 goto out_unlock;
371 }
372 if (new_size > device->bdev->bd_inode->i_size) {
373 ret = -EFBIG;
374 goto out_unlock;
375 }
376
377 do_div(new_size, root->sectorsize);
378 new_size *= root->sectorsize;
379
380 printk(KERN_INFO "new size for %s is %llu\n",
381 device->name, (unsigned long long)new_size);
382
383 if (new_size > old_size) {
384 trans = btrfs_start_transaction(root, 1);
385 ret = btrfs_grow_device(trans, device, new_size);
386 btrfs_commit_transaction(trans, root);
387 } else {
388 ret = btrfs_shrink_device(device, new_size);
389 }
390
391out_unlock:
Chris Mason7d9eb122008-07-08 14:19:17 -0400392 mutex_unlock(&root->fs_info->volume_mutex);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400393out:
394 kfree(vol_args);
395 return ret;
396}
397
398static noinline int btrfs_ioctl_snap_create(struct btrfs_root *root,
399 void __user *arg)
400{
401 struct btrfs_ioctl_vol_args *vol_args;
402 struct btrfs_dir_item *di;
403 struct btrfs_path *path;
404 u64 root_dirid;
405 int namelen;
406 int ret;
407
408 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
409
410 if (!vol_args)
411 return -ENOMEM;
412
413 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
414 ret = -EFAULT;
415 goto out;
416 }
417
Mark Fasheh5516e592008-07-24 12:20:14 -0400418 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400419 namelen = strlen(vol_args->name);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400420 if (strchr(vol_args->name, '/')) {
421 ret = -EINVAL;
422 goto out;
423 }
424
425 path = btrfs_alloc_path();
426 if (!path) {
427 ret = -ENOMEM;
428 goto out;
429 }
430
431 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400432 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
433 path, root_dirid,
434 vol_args->name, namelen, 0);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400435 btrfs_free_path(path);
436
437 if (di && !IS_ERR(di)) {
438 ret = -EEXIST;
439 goto out;
440 }
441
442 if (IS_ERR(di)) {
443 ret = PTR_ERR(di);
444 goto out;
445 }
446
Chris Masona2135012008-06-25 16:01:30 -0400447 mutex_lock(&root->fs_info->drop_mutex);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400448 if (root == root->fs_info->tree_root)
449 ret = create_subvol(root, vol_args->name, namelen);
450 else
451 ret = create_snapshot(root, vol_args->name, namelen);
Chris Masona2135012008-06-25 16:01:30 -0400452 mutex_unlock(&root->fs_info->drop_mutex);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400453out:
454 kfree(vol_args);
455 return ret;
456}
457
458static int btrfs_ioctl_defrag(struct file *file)
459{
460 struct inode *inode = fdentry(file)->d_inode;
461 struct btrfs_root *root = BTRFS_I(inode)->root;
462
463 switch (inode->i_mode & S_IFMT) {
464 case S_IFDIR:
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400465 btrfs_defrag_root(root, 0);
466 btrfs_defrag_root(root->fs_info->extent_root, 0);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400467 break;
468 case S_IFREG:
469 btrfs_defrag_file(file);
470 break;
471 }
472
473 return 0;
474}
475
476long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
477{
478 struct btrfs_ioctl_vol_args *vol_args;
479 int ret;
480
481 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
482
483 if (!vol_args)
484 return -ENOMEM;
485
486 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
487 ret = -EFAULT;
488 goto out;
489 }
Mark Fasheh5516e592008-07-24 12:20:14 -0400490 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400491 ret = btrfs_init_new_device(root, vol_args->name);
492
493out:
494 kfree(vol_args);
495 return ret;
496}
497
498long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
499{
500 struct btrfs_ioctl_vol_args *vol_args;
501 int ret;
502
503 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
504
505 if (!vol_args)
506 return -ENOMEM;
507
508 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
509 ret = -EFAULT;
510 goto out;
511 }
Mark Fasheh5516e592008-07-24 12:20:14 -0400512 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400513 ret = btrfs_rm_device(root, vol_args->name);
514
515out:
516 kfree(vol_args);
517 return ret;
518}
519
520int dup_item_to_inode(struct btrfs_trans_handle *trans,
521 struct btrfs_root *root,
522 struct btrfs_path *path,
523 struct extent_buffer *leaf,
524 int slot,
525 struct btrfs_key *key,
526 u64 destino)
527{
528 char *dup;
529 int len = btrfs_item_size_nr(leaf, slot);
530 struct btrfs_key ckey = *key;
531 int ret = 0;
532
533 dup = kmalloc(len, GFP_NOFS);
534 if (!dup)
535 return -ENOMEM;
536
537 read_extent_buffer(leaf, dup, btrfs_item_ptr_offset(leaf, slot), len);
538 btrfs_release_path(root, path);
539
540 ckey.objectid = destino;
541 ret = btrfs_insert_item(trans, root, &ckey, dup, len);
542 kfree(dup);
543 return ret;
544}
545
546long btrfs_ioctl_clone(struct file *file, unsigned long src_fd)
547{
548 struct inode *inode = fdentry(file)->d_inode;
549 struct btrfs_root *root = BTRFS_I(inode)->root;
550 struct file *src_file;
551 struct inode *src;
552 struct btrfs_trans_handle *trans;
553 int ret;
554 u64 pos;
555 struct btrfs_path *path;
556 struct btrfs_key key;
557 struct extent_buffer *leaf;
558 u32 nritems;
559 int slot;
560
561 src_file = fget(src_fd);
562 if (!src_file)
563 return -EBADF;
564 src = src_file->f_dentry->d_inode;
565
566 ret = -EXDEV;
567 if (src->i_sb != inode->i_sb)
568 goto out_fput;
569
570 if (inode < src) {
571 mutex_lock(&inode->i_mutex);
572 mutex_lock(&src->i_mutex);
573 } else {
574 mutex_lock(&src->i_mutex);
575 mutex_lock(&inode->i_mutex);
576 }
577
578 ret = -ENOTEMPTY;
579 if (inode->i_size)
580 goto out_unlock;
581
582 /* do any pending delalloc/csum calc on src, one way or
583 another, and lock file content */
584 while (1) {
585 filemap_write_and_wait(src->i_mapping);
586 lock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
587 if (BTRFS_I(src)->delalloc_bytes == 0)
588 break;
589 unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
590 }
591
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400592 trans = btrfs_start_transaction(root, 0);
593 path = btrfs_alloc_path();
594 if (!path) {
595 ret = -ENOMEM;
596 goto out;
597 }
598 key.offset = 0;
599 key.type = BTRFS_EXTENT_DATA_KEY;
600 key.objectid = src->i_ino;
601 pos = 0;
602 path->reada = 2;
603
604 while (1) {
605 /*
606 * note the key will change type as we walk through the
607 * tree.
608 */
609 ret = btrfs_search_slot(trans, root, &key, path, 0, 0);
610 if (ret < 0)
611 goto out;
612
613 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
614 ret = btrfs_next_leaf(root, path);
615 if (ret < 0)
616 goto out;
617 if (ret > 0)
618 break;
619 }
620 leaf = path->nodes[0];
621 slot = path->slots[0];
622 btrfs_item_key_to_cpu(leaf, &key, slot);
623 nritems = btrfs_header_nritems(leaf);
624
625 if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY ||
626 key.objectid != src->i_ino)
627 break;
628
629 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
630 struct btrfs_file_extent_item *extent;
631 int found_type;
632 pos = key.offset;
633 extent = btrfs_item_ptr(leaf, slot,
634 struct btrfs_file_extent_item);
635 found_type = btrfs_file_extent_type(leaf, extent);
636 if (found_type == BTRFS_FILE_EXTENT_REG) {
637 u64 len = btrfs_file_extent_num_bytes(leaf,
638 extent);
639 u64 ds = btrfs_file_extent_disk_bytenr(leaf,
640 extent);
641 u64 dl = btrfs_file_extent_disk_num_bytes(leaf,
642 extent);
643 u64 off = btrfs_file_extent_offset(leaf,
644 extent);
645 btrfs_insert_file_extent(trans, root,
646 inode->i_ino, pos,
647 ds, dl, len, off);
648 /* ds == 0 means there's a hole */
649 if (ds != 0) {
650 btrfs_inc_extent_ref(trans, root,
651 ds, dl,
652 root->root_key.objectid,
653 trans->transid,
654 inode->i_ino, pos);
655 }
656 pos = key.offset + len;
657 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
658 ret = dup_item_to_inode(trans, root, path,
659 leaf, slot, &key,
660 inode->i_ino);
661 if (ret)
662 goto out;
663 pos = key.offset + btrfs_item_size_nr(leaf,
664 slot);
665 }
666 } else if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) {
667 ret = dup_item_to_inode(trans, root, path, leaf,
668 slot, &key, inode->i_ino);
669
670 if (ret)
671 goto out;
672 }
673 key.offset++;
674 btrfs_release_path(root, path);
675 }
676
677 ret = 0;
678out:
679 btrfs_free_path(path);
680
681 inode->i_blocks = src->i_blocks;
682 i_size_write(inode, src->i_size);
683 btrfs_update_inode(trans, root, inode);
684
685 unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
686
687 btrfs_end_transaction(trans, root);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400688
689out_unlock:
690 mutex_unlock(&src->i_mutex);
691 mutex_unlock(&inode->i_mutex);
692out_fput:
693 fput(src_file);
694 return ret;
695}
696
697/*
698 * there are many ways the trans_start and trans_end ioctls can lead
699 * to deadlocks. They should only be used by applications that
700 * basically own the machine, and have a very in depth understanding
701 * of all the possible deadlocks and enospc problems.
702 */
703long btrfs_ioctl_trans_start(struct file *file)
704{
705 struct inode *inode = fdentry(file)->d_inode;
706 struct btrfs_root *root = BTRFS_I(inode)->root;
707 struct btrfs_trans_handle *trans;
708 int ret = 0;
709
Christoph Hellwigdf5b5522008-06-11 21:53:58 -0400710 if (!capable(CAP_SYS_ADMIN))
711 return -EPERM;
712
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400713 if (file->private_data) {
714 ret = -EINPROGRESS;
715 goto out;
716 }
Sage Weil9ca9ee02008-08-04 10:41:27 -0400717
718 mutex_lock(&root->fs_info->trans_mutex);
719 root->fs_info->open_ioctl_trans++;
720 mutex_unlock(&root->fs_info->trans_mutex);
721
722 trans = btrfs_start_ioctl_transaction(root, 0);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400723 if (trans)
724 file->private_data = trans;
725 else
726 ret = -ENOMEM;
727 /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/
728out:
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400729 return ret;
730}
731
732/*
733 * there are many ways the trans_start and trans_end ioctls can lead
734 * to deadlocks. They should only be used by applications that
735 * basically own the machine, and have a very in depth understanding
736 * of all the possible deadlocks and enospc problems.
737 */
738long btrfs_ioctl_trans_end(struct file *file)
739{
740 struct inode *inode = fdentry(file)->d_inode;
741 struct btrfs_root *root = BTRFS_I(inode)->root;
742 struct btrfs_trans_handle *trans;
743 int ret = 0;
744
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400745 trans = file->private_data;
746 if (!trans) {
747 ret = -EINVAL;
748 goto out;
749 }
750 btrfs_end_transaction(trans, root);
751 file->private_data = 0;
Sage Weil9ca9ee02008-08-04 10:41:27 -0400752
753 mutex_lock(&root->fs_info->trans_mutex);
754 root->fs_info->open_ioctl_trans--;
755 mutex_unlock(&root->fs_info->trans_mutex);
756
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400757out:
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400758 return ret;
759}
760
761long btrfs_ioctl(struct file *file, unsigned int
762 cmd, unsigned long arg)
763{
764 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
765
766 switch (cmd) {
767 case BTRFS_IOC_SNAP_CREATE:
768 return btrfs_ioctl_snap_create(root, (void __user *)arg);
769 case BTRFS_IOC_DEFRAG:
770 return btrfs_ioctl_defrag(file);
771 case BTRFS_IOC_RESIZE:
772 return btrfs_ioctl_resize(root, (void __user *)arg);
773 case BTRFS_IOC_ADD_DEV:
774 return btrfs_ioctl_add_dev(root, (void __user *)arg);
775 case BTRFS_IOC_RM_DEV:
776 return btrfs_ioctl_rm_dev(root, (void __user *)arg);
777 case BTRFS_IOC_BALANCE:
778 return btrfs_balance(root->fs_info->dev_root);
779 case BTRFS_IOC_CLONE:
780 return btrfs_ioctl_clone(file, arg);
781 case BTRFS_IOC_TRANS_START:
782 return btrfs_ioctl_trans_start(file);
783 case BTRFS_IOC_TRANS_END:
784 return btrfs_ioctl_trans_end(file);
785 case BTRFS_IOC_SYNC:
Chris Masonea8c2812008-08-04 23:17:27 -0400786 btrfs_start_delalloc_inodes(root);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400787 btrfs_sync_fs(file->f_dentry->d_sb, 1);
788 return 0;
789 }
790
791 return -ENOTTY;
792}