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Btrfs: batch extent inserts/updates/deletions on the extent root
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / btrfs / ioctl.c
CommitLineData
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		 55static 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);
80ff3856 115 btrfs_set_root_last_snapshot(&root_item, 0);
f46b5a66
CH		 116
117 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
118 root_item.drop_level = 0;
119
925baedd 120 btrfs_tree_unlock(leaf);
f46b5a66
CH		 121 free_extent_buffer(leaf);
122 leaf = NULL;
123
124 btrfs_set_root_dirid(&root_item, new_dirid);
125
126 key.objectid = objectid;
127 key.offset = 1;
128 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
129 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
130 &root_item);
131 if (ret)
132 goto fail;
133
134 /*
135 * insert the directory item
136 */
137 key.offset = (u64)-1;
138 dir = root->fs_info->sb->s_root->d_inode;
139 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
140 name, namelen, dir->i_ino, &key,
aec7477b 141 BTRFS_FT_DIR, 0);
f46b5a66
CH		 142 if (ret)
143 goto fail;
144
145 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
146 name, namelen, objectid,
aec7477b 147 root->fs_info->sb->s_root->d_inode->i_ino, 0);
f46b5a66
CH		 148 if (ret)
149 goto fail;
150
151 ret = btrfs_commit_transaction(trans, root);
152 if (ret)
153 goto fail_commit;
154
155 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
156 BUG_ON(!new_root);
157
158 trans = btrfs_start_transaction(new_root, 1);
159 BUG_ON(!trans);
160
cb8e7090 161 ret = btrfs_create_subvol_root(new_root, dentry, trans, new_dirid,
f46b5a66
CH		 162 BTRFS_I(dir)->block_group);
163 if (ret)
164 goto fail;
165
f46b5a66
CH		 166fail:
167 nr = trans->blocks_used;
168 err = btrfs_commit_transaction(trans, new_root);
169 if (err && !ret)
170 ret = err;
171fail_commit:
f46b5a66 172 btrfs_btree_balance_dirty(root, nr);
f46b5a66
CH		 173 return ret;
174}
175
176static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
177{
178 struct btrfs_pending_snapshot *pending_snapshot;
179 struct btrfs_trans_handle *trans;
180 int ret;
181 int err;
182 unsigned long nr = 0;
183
184 if (!root->ref_cows)
185 return -EINVAL;
186
f46b5a66
CH		 187 ret = btrfs_check_free_space(root, 1, 0);
188 if (ret)
189 goto fail_unlock;
190
191 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
192 if (!pending_snapshot) {
193 ret = -ENOMEM;
194 goto fail_unlock;
195 }
196 pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
197 if (!pending_snapshot->name) {
198 ret = -ENOMEM;
199 kfree(pending_snapshot);
200 goto fail_unlock;
201 }
202 memcpy(pending_snapshot->name, name, namelen);
203 pending_snapshot->name[namelen] = '\0';
204 trans = btrfs_start_transaction(root, 1);
205 BUG_ON(!trans);
206 pending_snapshot->root = root;
207 list_add(&pending_snapshot->list,
208 &trans->transaction->pending_snapshots);
209 ret = btrfs_update_inode(trans, root, root->inode);
210 err = btrfs_commit_transaction(trans, root);
211
212fail_unlock:
f46b5a66 213 btrfs_btree_balance_dirty(root, nr);
f46b5a66
CH		 214 return ret;
215}
216
cb8e7090
CH		 217/* copy of may_create in fs/namei.c() */
218static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
219{
220 if (child->d_inode)
221 return -EEXIST;
222 if (IS_DEADDIR(dir))
223 return -ENOENT;
224 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
225}
226
227/*
228 * Create a new subvolume below @parent. This is largely modeled after
229 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
230 * inside this filesystem so it's quite a bit simpler.
231 */
232static noinline int btrfs_mksubvol(struct path *parent, char *name,
233 int mode, int namelen)
234{
235 struct dentry *dentry;
236 int error;
237
238 mutex_lock_nested(&parent->dentry->d_inode->i_mutex, I_MUTEX_PARENT);
239
240 dentry = lookup_one_len(name, parent->dentry, namelen);
241 error = PTR_ERR(dentry);
242 if (IS_ERR(dentry))
243 goto out_unlock;
244
245 error = -EEXIST;
246 if (dentry->d_inode)
247 goto out_dput;
248
249 if (!IS_POSIXACL(parent->dentry->d_inode))
250 mode &= ~current->fs->umask;
251 error = mnt_want_write(parent->mnt);
252 if (error)
253 goto out_dput;
254
255 error = btrfs_may_create(parent->dentry->d_inode, dentry);
256 if (error)
257 goto out_drop_write;
258
cb8e7090
CH		 259 /*
260 * Actually perform the low-level subvolume creation after all
261 * this VFS fuzz.
262 *
263 * Eventually we want to pass in an inode under which we create this
264 * subvolume, but for now all are under the filesystem root.
265 *
266 * Also we should pass on the mode eventually to allow creating new
267 * subvolume with specific mode bits.
268 */
269 error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root, dentry,
270 name, namelen);
271 if (error)
272 goto out_drop_write;
273
274 fsnotify_mkdir(parent->dentry->d_inode, dentry);
275out_drop_write:
276 mnt_drop_write(parent->mnt);
277out_dput:
278 dput(dentry);
279out_unlock:
280 mutex_unlock(&parent->dentry->d_inode->i_mutex);
281 return error;
282}
283
284
f46b5a66
CH		 285int btrfs_defrag_file(struct file *file)
286{
287 struct inode *inode = fdentry(file)->d_inode;
288 struct btrfs_root *root = BTRFS_I(inode)->root;
289 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
3eaa2885 290 struct btrfs_ordered_extent *ordered;
f46b5a66
CH		 291 struct page *page;
292 unsigned long last_index;
293 unsigned long ra_pages = root->fs_info->bdi.ra_pages;
294 unsigned long total_read = 0;
295 u64 page_start;
296 u64 page_end;
297 unsigned long i;
298 int ret;
299
f46b5a66 300 ret = btrfs_check_free_space(root, inode->i_size, 0);
f46b5a66
CH		 301 if (ret)
302 return -ENOSPC;
303
304 mutex_lock(&inode->i_mutex);
305 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
306 for (i = 0; i <= last_index; i++) {
307 if (total_read % ra_pages == 0) {
308 btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i,
309 min(last_index, i + ra_pages - 1));
310 }
311 total_read++;
3eaa2885 312again:
f46b5a66
CH		 313 page = grab_cache_page(inode->i_mapping, i);
314 if (!page)
315 goto out_unlock;
316 if (!PageUptodate(page)) {
317 btrfs_readpage(NULL, page);
318 lock_page(page);
319 if (!PageUptodate(page)) {
320 unlock_page(page);
321 page_cache_release(page);
322 goto out_unlock;
323 }
324 }
325
f46b5a66 326 wait_on_page_writeback(page);
f46b5a66
CH		 327
328 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
329 page_end = page_start + PAGE_CACHE_SIZE - 1;
f46b5a66 330 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
3eaa2885
CM		 331
332 ordered = btrfs_lookup_ordered_extent(inode, page_start);
333 if (ordered) {
334 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
335 unlock_page(page);
336 page_cache_release(page);
337 btrfs_start_ordered_extent(inode, ordered, 1);
338 btrfs_put_ordered_extent(ordered);
339 goto again;
340 }
341 set_page_extent_mapped(page);
342
f87f057b
CM		 343 /*
344 * this makes sure page_mkwrite is called on the
345 * page if it is dirtied again later
346 */
347 clear_page_dirty_for_io(page);
348
ea8c2819 349 btrfs_set_extent_delalloc(inode, page_start, page_end);
f46b5a66
CH		 350
351 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
352 set_page_dirty(page);
353 unlock_page(page);
354 page_cache_release(page);
355 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
356 }
357
358out_unlock:
359 mutex_unlock(&inode->i_mutex);
360 return 0;
361}
362
363/*
364 * Called inside transaction, so use GFP_NOFS
365 */
366
367static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
368{
369 u64 new_size;
370 u64 old_size;
371 u64 devid = 1;
372 struct btrfs_ioctl_vol_args *vol_args;
373 struct btrfs_trans_handle *trans;
374 struct btrfs_device *device = NULL;
375 char *sizestr;
376 char *devstr = NULL;
377 int ret = 0;
378 int namelen;
379 int mod = 0;
380
381 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
382
383 if (!vol_args)
384 return -ENOMEM;
385
386 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
387 ret = -EFAULT;
388 goto out;
389 }
5516e595
MF		 390
391 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66 392 namelen = strlen(vol_args->name);
f46b5a66 393
7d9eb12c 394 mutex_lock(&root->fs_info->volume_mutex);
f46b5a66
CH		 395 sizestr = vol_args->name;
396 devstr = strchr(sizestr, ':');
397 if (devstr) {
398 char *end;
399 sizestr = devstr + 1;
400 *devstr = '\0';
401 devstr = vol_args->name;
402 devid = simple_strtoull(devstr, &end, 10);
403 printk(KERN_INFO "resizing devid %llu\n", devid);
404 }
405 device = btrfs_find_device(root, devid, NULL);
406 if (!device) {
407 printk(KERN_INFO "resizer unable to find device %llu\n", devid);
408 ret = -EINVAL;
409 goto out_unlock;
410 }
411 if (!strcmp(sizestr, "max"))
412 new_size = device->bdev->bd_inode->i_size;
413 else {
414 if (sizestr[0] == '-') {
415 mod = -1;
416 sizestr++;
417 } else if (sizestr[0] == '+') {
418 mod = 1;
419 sizestr++;
420 }
421 new_size = btrfs_parse_size(sizestr);
422 if (new_size == 0) {
423 ret = -EINVAL;
424 goto out_unlock;
425 }
426 }
427
428 old_size = device->total_bytes;
429
430 if (mod < 0) {
431 if (new_size > old_size) {
432 ret = -EINVAL;
433 goto out_unlock;
434 }
435 new_size = old_size - new_size;
436 } else if (mod > 0) {
437 new_size = old_size + new_size;
438 }
439
440 if (new_size < 256 * 1024 * 1024) {
441 ret = -EINVAL;
442 goto out_unlock;
443 }
444 if (new_size > device->bdev->bd_inode->i_size) {
445 ret = -EFBIG;
446 goto out_unlock;
447 }
448
449 do_div(new_size, root->sectorsize);
450 new_size *= root->sectorsize;
451
452 printk(KERN_INFO "new size for %s is %llu\n",
453 device->name, (unsigned long long)new_size);
454
455 if (new_size > old_size) {
456 trans = btrfs_start_transaction(root, 1);
457 ret = btrfs_grow_device(trans, device, new_size);
458 btrfs_commit_transaction(trans, root);
459 } else {
460 ret = btrfs_shrink_device(device, new_size);
461 }
462
463out_unlock:
7d9eb12c 464 mutex_unlock(&root->fs_info->volume_mutex);
f46b5a66
CH		 465out:
466 kfree(vol_args);
467 return ret;
468}
469
cb8e7090 470static noinline int btrfs_ioctl_snap_create(struct file *file,
f46b5a66
CH		 471 void __user *arg)
472{
cb8e7090 473 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
f46b5a66
CH		 474 struct btrfs_ioctl_vol_args *vol_args;
475 struct btrfs_dir_item *di;
476 struct btrfs_path *path;
477 u64 root_dirid;
478 int namelen;
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 }
490
5516e595 491 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66 492 namelen = strlen(vol_args->name);
f46b5a66
CH		 493 if (strchr(vol_args->name, '/')) {
494 ret = -EINVAL;
495 goto out;
496 }
497
498 path = btrfs_alloc_path();
499 if (!path) {
500 ret = -ENOMEM;
501 goto out;
502 }
503
504 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
f46b5a66
CH		 505 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
506 path, root_dirid,
507 vol_args->name, namelen, 0);
f46b5a66
CH		 508 btrfs_free_path(path);
509
510 if (di && !IS_ERR(di)) {
511 ret = -EEXIST;
512 goto out;
513 }
514
515 if (IS_ERR(di)) {
516 ret = PTR_ERR(di);
517 goto out;
518 }
519
cb8e7090
CH		 520 if (root == root->fs_info->tree_root) {
521 ret = btrfs_mksubvol(&file->f_path, vol_args->name,
522 file->f_path.dentry->d_inode->i_mode,
523 namelen);
524 } else {
f46b5a66 525 ret = create_snapshot(root, vol_args->name, namelen);
cb8e7090
CH		 526 }
527
f46b5a66
CH		 528out:
529 kfree(vol_args);
530 return ret;
531}
532
533static int btrfs_ioctl_defrag(struct file *file)
534{
535 struct inode *inode = fdentry(file)->d_inode;
536 struct btrfs_root *root = BTRFS_I(inode)->root;
537
538 switch (inode->i_mode & S_IFMT) {
539 case S_IFDIR:
f46b5a66
CH		 540 btrfs_defrag_root(root, 0);
541 btrfs_defrag_root(root->fs_info->extent_root, 0);
f46b5a66
CH		 542 break;
543 case S_IFREG:
544 btrfs_defrag_file(file);
545 break;
546 }
547
548 return 0;
549}
550
551long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
552{
553 struct btrfs_ioctl_vol_args *vol_args;
554 int ret;
555
556 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
557
558 if (!vol_args)
559 return -ENOMEM;
560
561 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
562 ret = -EFAULT;
563 goto out;
564 }
5516e595 565 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66
CH		 566 ret = btrfs_init_new_device(root, vol_args->name);
567
568out:
569 kfree(vol_args);
570 return ret;
571}
572
573long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
574{
575 struct btrfs_ioctl_vol_args *vol_args;
576 int ret;
577
578 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
579
580 if (!vol_args)
581 return -ENOMEM;
582
583 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
584 ret = -EFAULT;
585 goto out;
586 }
5516e595 587 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66
CH		 588 ret = btrfs_rm_device(root, vol_args->name);
589
590out:
591 kfree(vol_args);
592 return ret;
593}
594
c5c9cd4d
SW		 595long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off,
596 u64 olen, u64 destoff)
f46b5a66
CH		 597{
598 struct inode *inode = fdentry(file)->d_inode;
599 struct btrfs_root *root = BTRFS_I(inode)->root;
600 struct file *src_file;
601 struct inode *src;
602 struct btrfs_trans_handle *trans;
f46b5a66 603 struct btrfs_path *path;
f46b5a66 604 struct extent_buffer *leaf;
ae01a0ab
YZ		 605 char *buf;
606 struct btrfs_key key;
f46b5a66
CH		 607 u32 nritems;
608 int slot;
ae01a0ab 609 int ret;
c5c9cd4d
SW		 610 u64 len = olen;
611 u64 bs = root->fs_info->sb->s_blocksize;
612 u64 hint_byte;
f46b5a66 613
c5c9cd4d
SW		 614 /*
615 * TODO:
616 * - split compressed inline extents. annoying: we need to
617 * decompress into destination's address_space (the file offset
618 * may change, so source mapping won't do), then recompress (or
619 * otherwise reinsert) a subrange.
620 * - allow ranges within the same file to be cloned (provided
621 * they don't overlap)?
622 */
623
624 src_file = fget(srcfd);
f46b5a66
CH		 625 if (!src_file)
626 return -EBADF;
627 src = src_file->f_dentry->d_inode;
628
c5c9cd4d
SW		 629 ret = -EINVAL;
630 if (src == inode)
631 goto out_fput;
632
ae01a0ab
YZ		 633 ret = -EISDIR;
634 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
635 goto out_fput;
636
f46b5a66 637 ret = -EXDEV;
ae01a0ab
YZ		 638 if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root)
639 goto out_fput;
640
641 ret = -ENOMEM;
642 buf = vmalloc(btrfs_level_size(root, 0));
643 if (!buf)
644 goto out_fput;
645
646 path = btrfs_alloc_path();
647 if (!path) {
648 vfree(buf);
f46b5a66 649 goto out_fput;
ae01a0ab
YZ		 650 }
651 path->reada = 2;
f46b5a66
CH		 652
653 if (inode < src) {
654 mutex_lock(&inode->i_mutex);
655 mutex_lock(&src->i_mutex);
656 } else {
657 mutex_lock(&src->i_mutex);
658 mutex_lock(&inode->i_mutex);
659 }
660
c5c9cd4d
SW		 661 /* determine range to clone */
662 ret = -EINVAL;
663 if (off >= src->i_size || off + len > src->i_size)
f46b5a66 664 goto out_unlock;
c5c9cd4d
SW		 665 if (len == 0)
666 olen = len = src->i_size - off;
667 /* if we extend to eof, continue to block boundary */
668 if (off + len == src->i_size)
669 len = ((src->i_size + bs-1) & ~(bs-1))
670 - off;
671
672 /* verify the end result is block aligned */
673 if ((off & (bs-1)) ||
674 ((off + len) & (bs-1)))
675 goto out_unlock;
676
677 printk("final src extent is %llu~%llu\n", off, len);
678 printk("final dst extent is %llu~%llu\n", destoff, len);
f46b5a66
CH		 679
680 /* do any pending delalloc/csum calc on src, one way or
681 another, and lock file content */
682 while (1) {
31840ae1 683 struct btrfs_ordered_extent *ordered;
c5c9cd4d
SW		 684 lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
685 ordered = btrfs_lookup_first_ordered_extent(inode, off+len);
ae01a0ab 686 if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered)
f46b5a66 687 break;
c5c9cd4d 688 unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
ae01a0ab
YZ		 689 if (ordered)
690 btrfs_put_ordered_extent(ordered);
c5c9cd4d 691 btrfs_wait_ordered_range(src, off, off+len);
f46b5a66
CH		 692 }
693
ae01a0ab
YZ		 694 trans = btrfs_start_transaction(root, 1);
695 BUG_ON(!trans);
696
c5c9cd4d
SW		 697 /* punch hole in destination first */
698 btrfs_drop_extents(trans, root, inode, off, off+len, 0, &hint_byte);
699
700 /* clone data */
f46b5a66 701 key.objectid = src->i_ino;
ae01a0ab
YZ		 702 key.type = BTRFS_EXTENT_DATA_KEY;
703 key.offset = 0;
f46b5a66
CH		 704
705 while (1) {
706 /*
707 * note the key will change type as we walk through the
708 * tree.
709 */
710 ret = btrfs_search_slot(trans, root, &key, path, 0, 0);
711 if (ret < 0)
712 goto out;
713
ae01a0ab
YZ		 714 nritems = btrfs_header_nritems(path->nodes[0]);
715 if (path->slots[0] >= nritems) {
f46b5a66
CH		 716 ret = btrfs_next_leaf(root, path);
717 if (ret < 0)
718 goto out;
719 if (ret > 0)
720 break;
ae01a0ab 721 nritems = btrfs_header_nritems(path->nodes[0]);
f46b5a66
CH		 722 }
723 leaf = path->nodes[0];
724 slot = path->slots[0];
f46b5a66 725
ae01a0ab 726 btrfs_item_key_to_cpu(leaf, &key, slot);
f46b5a66
CH		 727 if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY ||
728 key.objectid != src->i_ino)
729 break;
730
c5c9cd4d
SW		 731 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
732 struct btrfs_file_extent_item *extent;
733 int type;
31840ae1
ZY		 734 u32 size;
735 struct btrfs_key new_key;
c5c9cd4d
SW		 736 u64 disko = 0, diskl = 0;
737 u64 datao = 0, datal = 0;
738 u8 comp;
31840ae1
ZY		 739
740 size = btrfs_item_size_nr(leaf, slot);
741 read_extent_buffer(leaf, buf,
742 btrfs_item_ptr_offset(leaf, slot),
743 size);
c5c9cd4d
SW		 744
745 extent = btrfs_item_ptr(leaf, slot,
746 struct btrfs_file_extent_item);
747 comp = btrfs_file_extent_compression(leaf, extent);
748 type = btrfs_file_extent_type(leaf, extent);
749 if (type == BTRFS_FILE_EXTENT_REG) {
750 disko = btrfs_file_extent_disk_bytenr(leaf, extent);
751 diskl = btrfs_file_extent_disk_num_bytes(leaf, extent);
752 datao = btrfs_file_extent_offset(leaf, extent);
753 datal = btrfs_file_extent_num_bytes(leaf, extent);
754 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
755 /* take upper bound, may be compressed */
756 datal = btrfs_file_extent_ram_bytes(leaf,
757 extent);
758 }
31840ae1
ZY		 759 btrfs_release_path(root, path);
760
c5c9cd4d
SW		 761 if (key.offset + datal < off ||
762 key.offset >= off+len)
763 goto next;
764
31840ae1
ZY		 765 memcpy(&new_key, &key, sizeof(new_key));
766 new_key.objectid = inode->i_ino;
c5c9cd4d 767 new_key.offset = key.offset + destoff - off;
31840ae1 768
c5c9cd4d
SW		 769 if (type == BTRFS_FILE_EXTENT_REG) {
770 ret = btrfs_insert_empty_item(trans, root, path,
771 &new_key, size);
772 if (ret)
773 goto out;
774
775 leaf = path->nodes[0];
776 slot = path->slots[0];
777 write_extent_buffer(leaf, buf,
31840ae1
ZY		 778 btrfs_item_ptr_offset(leaf, slot),
779 size);
ae01a0ab 780
c5c9cd4d 781 extent = btrfs_item_ptr(leaf, slot,
f46b5a66 782 struct btrfs_file_extent_item);
c5c9cd4d
SW		 783 printk(" orig disk %llu~%llu data %llu~%llu\n",
784 disko, diskl, datao, datal);
785
786 if (off > key.offset) {
787 datao += off - key.offset;
788 datal -= off - key.offset;
789 }
790 if (key.offset + datao + datal + key.offset >
791 off + len)
792 datal = off + len - key.offset - datao;
793 /* disko == 0 means it's a hole */
794 if (!disko)
795 datao = 0;
796 printk(" final disk %llu~%llu data %llu~%llu\n",
797 disko, diskl, datao, datal);
798
799 btrfs_set_file_extent_offset(leaf, extent,
800 datao);
801 btrfs_set_file_extent_num_bytes(leaf, extent,
802 datal);
803 if (disko) {
804 inode_add_bytes(inode, datal);
ae01a0ab 805 ret = btrfs_inc_extent_ref(trans, root,
c5c9cd4d
SW		 806 disko, diskl, leaf->start,
807 root->root_key.objectid,
808 trans->transid,
809 inode->i_ino);
31840ae1 810 BUG_ON(ret);
f46b5a66 811 }
c5c9cd4d
SW		 812 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
813 u64 skip = 0;
814 u64 trim = 0;
815 if (off > key.offset) {
816 skip = off - key.offset;
817 new_key.offset += skip;
818 }
819 if (key.offset + datal > off+len)
820 trim = key.offset + datal - (off+len);
821 printk("len %lld skip %lld trim %lld\n",
822 datal, skip, trim);
823 if (comp && (skip || trim)) {
824 printk("btrfs clone_range can't split compressed inline extents yet\n");
825 ret = -EINVAL;
826 goto out;
827 }
828 size -= skip + trim;
829 datal -= skip + trim;
830 ret = btrfs_insert_empty_item(trans, root, path,
831 &new_key, size);
832 if (ret)
833 goto out;
834
835 if (skip) {
836 u32 start = btrfs_file_extent_calc_inline_size(0);
837 memmove(buf+start, buf+start+skip,
838 datal);
839 }
840
841 leaf = path->nodes[0];
842 slot = path->slots[0];
843 write_extent_buffer(leaf, buf,
844 btrfs_item_ptr_offset(leaf, slot),
845 size);
846 inode_add_bytes(inode, datal);
f46b5a66 847 }
c5c9cd4d
SW		 848
849 btrfs_mark_buffer_dirty(leaf);
ae01a0ab 850 }
c5c9cd4d
SW		 851
852 if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) {
853 u32 size;
854 struct btrfs_key new_key;
855 u64 coverslen;
856 int coff, clen;
857
858 size = btrfs_item_size_nr(leaf, slot);
859 coverslen = (size / BTRFS_CRC32_SIZE) <<
860 root->fs_info->sb->s_blocksize_bits;
861 printk("csums for %llu~%llu\n",
862 key.offset, coverslen);
863 if (key.offset + coverslen < off ||
864 key.offset >= off+len)
865 goto next;
866
867 read_extent_buffer(leaf, buf,
868 btrfs_item_ptr_offset(leaf, slot),
869 size);
870 btrfs_release_path(root, path);
871
872 coff = 0;
873 if (off > key.offset)
874 coff = ((off - key.offset) >>
875 root->fs_info->sb->s_blocksize_bits) *
876 BTRFS_CRC32_SIZE;
877 clen = size - coff;
878 if (key.offset + coverslen > off+len)
879 clen -= ((key.offset+coverslen-off-len) >>
880 root->fs_info->sb->s_blocksize_bits) *
881 BTRFS_CRC32_SIZE;
882 printk(" will dup %d~%d of %d\n",
883 coff, clen, size);
884
885 memcpy(&new_key, &key, sizeof(new_key));
886 new_key.objectid = inode->i_ino;
887 new_key.offset = key.offset + destoff - off;
888
889 ret = btrfs_insert_empty_item(trans, root, path,
890 &new_key, clen);
891 if (ret)
892 goto out;
893
894 leaf = path->nodes[0];
895 slot = path->slots[0];
896 write_extent_buffer(leaf, buf + coff,
897 btrfs_item_ptr_offset(leaf, slot),
898 clen);
899 btrfs_mark_buffer_dirty(leaf);
900 }
901
902 next:
31840ae1 903 btrfs_release_path(root, path);
f46b5a66 904 key.offset++;
f46b5a66 905 }
f46b5a66
CH		 906 ret = 0;
907out:
ae01a0ab
YZ		 908 btrfs_release_path(root, path);
909 if (ret == 0) {
910 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
c5c9cd4d
SW		 911 if (destoff + olen > inode->i_size)
912 btrfs_i_size_write(inode, destoff + olen);
ae01a0ab
YZ		 913 BTRFS_I(inode)->flags = BTRFS_I(src)->flags;
914 ret = btrfs_update_inode(trans, root, inode);
915 }
f46b5a66 916 btrfs_end_transaction(trans, root);
c5c9cd4d 917 unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
ae01a0ab
YZ		 918 if (ret)
919 vmtruncate(inode, 0);
f46b5a66
CH		 920out_unlock:
921 mutex_unlock(&src->i_mutex);
922 mutex_unlock(&inode->i_mutex);
ae01a0ab
YZ		 923 vfree(buf);
924 btrfs_free_path(path);
f46b5a66
CH		 925out_fput:
926 fput(src_file);
927 return ret;
928}
929
c5c9cd4d
SW		 930long btrfs_ioctl_clone_range(struct file *file, unsigned long argptr)
931{
932 struct btrfs_ioctl_clone_range_args args;
933
934 if (copy_from_user(&args, (void *)argptr, sizeof(args)))
935 return -EFAULT;
936 return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
937 args.src_length, args.dest_offset);
938}
939
f46b5a66
CH		 940/*
941 * there are many ways the trans_start and trans_end ioctls can lead
942 * to deadlocks. They should only be used by applications that
943 * basically own the machine, and have a very in depth understanding
944 * of all the possible deadlocks and enospc problems.
945 */
946long btrfs_ioctl_trans_start(struct file *file)
947{
948 struct inode *inode = fdentry(file)->d_inode;
949 struct btrfs_root *root = BTRFS_I(inode)->root;
950 struct btrfs_trans_handle *trans;
951 int ret = 0;
952
df5b5520
CH		 953 if (!capable(CAP_SYS_ADMIN))
954 return -EPERM;
955
f46b5a66
CH		 956 if (file->private_data) {
957 ret = -EINPROGRESS;
958 goto out;
959 }
9ca9ee09
SW		 960
961 mutex_lock(&root->fs_info->trans_mutex);
962 root->fs_info->open_ioctl_trans++;
963 mutex_unlock(&root->fs_info->trans_mutex);
964
965 trans = btrfs_start_ioctl_transaction(root, 0);
f46b5a66
CH		 966 if (trans)
967 file->private_data = trans;
968 else
969 ret = -ENOMEM;
970 /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/
971out:
f46b5a66
CH		 972 return ret;
973}
974
975/*
976 * there are many ways the trans_start and trans_end ioctls can lead
977 * to deadlocks. They should only be used by applications that
978 * basically own the machine, and have a very in depth understanding
979 * of all the possible deadlocks and enospc problems.
980 */
981long btrfs_ioctl_trans_end(struct file *file)
982{
983 struct inode *inode = fdentry(file)->d_inode;
984 struct btrfs_root *root = BTRFS_I(inode)->root;
985 struct btrfs_trans_handle *trans;
986 int ret = 0;
987
f46b5a66
CH		 988 trans = file->private_data;
989 if (!trans) {
990 ret = -EINVAL;
991 goto out;
992 }
993 btrfs_end_transaction(trans, root);
b214107e 994 file->private_data = NULL;
9ca9ee09
SW		 995
996 mutex_lock(&root->fs_info->trans_mutex);
997 root->fs_info->open_ioctl_trans--;
998 mutex_unlock(&root->fs_info->trans_mutex);
999
f46b5a66 1000out:
f46b5a66
CH		 1001 return ret;
1002}
1003
1004long btrfs_ioctl(struct file *file, unsigned int
1005 cmd, unsigned long arg)
1006{
1007 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
1008
1009 switch (cmd) {
1010 case BTRFS_IOC_SNAP_CREATE:
cb8e7090 1011 return btrfs_ioctl_snap_create(file, (void __user *)arg);
f46b5a66
CH		 1012 case BTRFS_IOC_DEFRAG:
1013 return btrfs_ioctl_defrag(file);
1014 case BTRFS_IOC_RESIZE:
1015 return btrfs_ioctl_resize(root, (void __user *)arg);
1016 case BTRFS_IOC_ADD_DEV:
1017 return btrfs_ioctl_add_dev(root, (void __user *)arg);
1018 case BTRFS_IOC_RM_DEV:
1019 return btrfs_ioctl_rm_dev(root, (void __user *)arg);
1020 case BTRFS_IOC_BALANCE:
1021 return btrfs_balance(root->fs_info->dev_root);
1022 case BTRFS_IOC_CLONE:
c5c9cd4d
SW		 1023 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
1024 case BTRFS_IOC_CLONE_RANGE:
1025 return btrfs_ioctl_clone_range(file, arg);
f46b5a66
CH		 1026 case BTRFS_IOC_TRANS_START:
1027 return btrfs_ioctl_trans_start(file);
1028 case BTRFS_IOC_TRANS_END:
1029 return btrfs_ioctl_trans_end(file);
1030 case BTRFS_IOC_SYNC:
ea8c2819 1031 btrfs_start_delalloc_inodes(root);
f46b5a66
CH		 1032 btrfs_sync_fs(file->f_dentry->d_sb, 1);
1033 return 0;
1034 }
1035
1036 return -ENOTTY;
1037}
kernel source for telekom puls (alcatel/mediatek)