projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Add a min size parameter to btrfs_alloc_extent
[linux-2.6-block.git] / fs / btrfs / inode.c
CommitLineData
6cbd5570
CM		 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
065631f6 19#include <linux/bio.h>
39279cc3
CM		 20#include <linux/buffer_head.h>
21#include <linux/fs.h>
22#include <linux/pagemap.h>
23#include <linux/highmem.h>
24#include <linux/time.h>
25#include <linux/init.h>
26#include <linux/string.h>
27#include <linux/smp_lock.h>
28#include <linux/backing-dev.h>
29#include <linux/mpage.h>
30#include <linux/swap.h>
31#include <linux/writeback.h>
32#include <linux/statfs.h>
33#include <linux/compat.h>
9ebefb18 34#include <linux/bit_spinlock.h>
92fee66d 35#include <linux/version.h>
5103e947 36#include <linux/xattr.h>
39279cc3
CM		 37#include "ctree.h"
38#include "disk-io.h"
39#include "transaction.h"
40#include "btrfs_inode.h"
41#include "ioctl.h"
42#include "print-tree.h"
0b86a832 43#include "volumes.h"
39279cc3
CM		 44
45struct btrfs_iget_args {
46 u64 ino;
47 struct btrfs_root *root;
48};
49
50static struct inode_operations btrfs_dir_inode_operations;
51static struct inode_operations btrfs_symlink_inode_operations;
52static struct inode_operations btrfs_dir_ro_inode_operations;
618e21d5 53static struct inode_operations btrfs_special_inode_operations;
39279cc3
CM		 54static struct inode_operations btrfs_file_inode_operations;
55static struct address_space_operations btrfs_aops;
56static struct address_space_operations btrfs_symlink_aops;
57static struct file_operations btrfs_dir_file_operations;
d1310b2e 58static struct extent_io_ops btrfs_extent_io_ops;
39279cc3
CM		 59
60static struct kmem_cache *btrfs_inode_cachep;
61struct kmem_cache *btrfs_trans_handle_cachep;
62struct kmem_cache *btrfs_transaction_cachep;
63struct kmem_cache *btrfs_bit_radix_cachep;
64struct kmem_cache *btrfs_path_cachep;
65
66#define S_SHIFT 12
67static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
68 [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
69 [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
70 [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
71 [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
72 [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
73 [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
74 [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
75};
76
1832a6d5
CM		 77int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
78 int for_del)
79{
80 u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy);
81 u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy);
82 u64 thresh;
83 int ret = 0;
84
85 if (for_del)
f9ef6604 86 thresh = total * 90;
1832a6d5 87 else
f9ef6604
CM		 88 thresh = total * 85;
89
90 do_div(thresh, 100);
1832a6d5
CM		 91
92 spin_lock(&root->fs_info->delalloc_lock);
93 if (used + root->fs_info->delalloc_bytes + num_required > thresh)
94 ret = -ENOSPC;
95 spin_unlock(&root->fs_info->delalloc_lock);
96 return ret;
97}
98
be20aa9d 99static int cow_file_range(struct inode *inode, u64 start, u64 end)
b888db2b
CM		 100{
101 struct btrfs_root *root = BTRFS_I(inode)->root;
102 struct btrfs_trans_handle *trans;
b888db2b 103 u64 alloc_hint = 0;
db94535d 104 u64 num_bytes;
c59f8951 105 u64 cur_alloc_size;
db94535d 106 u64 blocksize = root->sectorsize;
d1310b2e
CM		 107 u64 orig_start = start;
108 u64 orig_num_bytes;
be20aa9d
CM		 109 struct btrfs_key ins;
110 int ret;
b888db2b 111
b888db2b 112 trans = btrfs_start_transaction(root, 1);
b888db2b 113 BUG_ON(!trans);
be20aa9d
CM		 114 btrfs_set_trans_block_group(trans, inode);
115
db94535d 116 num_bytes = (end - start + blocksize) & ~(blocksize - 1);
be20aa9d 117 num_bytes = max(blocksize, num_bytes);
b888db2b 118 ret = btrfs_drop_extents(trans, root, inode,
3326d1b0 119 start, start + num_bytes, start, &alloc_hint);
d1310b2e 120 orig_num_bytes = num_bytes;
db94535d 121
179e29e4
CM		 122 if (alloc_hint == EXTENT_MAP_INLINE)
123 goto out;
124
c59f8951
CM		 125 while(num_bytes > 0) {
126 cur_alloc_size = min(num_bytes, root->fs_info->max_extent);
127 ret = btrfs_alloc_extent(trans, root, cur_alloc_size,
98d20f67 128 root->sectorsize,
c59f8951
CM		 129 root->root_key.objectid,
130 trans->transid,
131 inode->i_ino, start, 0,
132 alloc_hint, (u64)-1, &ins, 1);
133 if (ret) {
134 WARN_ON(1);
135 goto out;
136 }
98d20f67 137 cur_alloc_size = ins.offset;
c59f8951
CM		 138 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
139 start, ins.objectid, ins.offset,
140 ins.offset);
9069218d 141 inode->i_blocks += ins.offset >> 9;
5f56406a 142 btrfs_check_file(root, inode);
c59f8951
CM		 143 num_bytes -= cur_alloc_size;
144 alloc_hint = ins.objectid + ins.offset;
145 start += cur_alloc_size;
b888db2b 146 }
d1310b2e
CM		 147 btrfs_drop_extent_cache(inode, orig_start,
148 orig_start + orig_num_bytes - 1);
dc17ff8f 149 btrfs_add_ordered_inode(inode);
9069218d 150 btrfs_update_inode(trans, root, inode);
b888db2b
CM		 151out:
152 btrfs_end_transaction(trans, root);
be20aa9d
CM		 153 return ret;
154}
155
156static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end)
157{
158 u64 extent_start;
159 u64 extent_end;
160 u64 bytenr;
161 u64 cow_end;
1832a6d5 162 u64 loops = 0;
c31f8830 163 u64 total_fs_bytes;
be20aa9d
CM		 164 struct btrfs_root *root = BTRFS_I(inode)->root;
165 struct extent_buffer *leaf;
166 int found_type;
167 struct btrfs_path *path;
168 struct btrfs_file_extent_item *item;
169 int ret;
170 int err;
171 struct btrfs_key found_key;
172
c31f8830 173 total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
be20aa9d
CM		 174 path = btrfs_alloc_path();
175 BUG_ON(!path);
176again:
177 ret = btrfs_lookup_file_extent(NULL, root, path,
178 inode->i_ino, start, 0);
179 if (ret < 0) {
180 btrfs_free_path(path);
181 return ret;
182 }
183
184 cow_end = end;
185 if (ret != 0) {
186 if (path->slots[0] == 0)
187 goto not_found;
188 path->slots[0]--;
189 }
190
191 leaf = path->nodes[0];
192 item = btrfs_item_ptr(leaf, path->slots[0],
193 struct btrfs_file_extent_item);
194
195 /* are we inside the extent that was found? */
196 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
197 found_type = btrfs_key_type(&found_key);
198 if (found_key.objectid != inode->i_ino ||
199 found_type != BTRFS_EXTENT_DATA_KEY) {
200 goto not_found;
201 }
202
203 found_type = btrfs_file_extent_type(leaf, item);
204 extent_start = found_key.offset;
205 if (found_type == BTRFS_FILE_EXTENT_REG) {
c31f8830
CM		 206 u64 extent_num_bytes;
207
208 extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item);
209 extent_end = extent_start + extent_num_bytes;
be20aa9d
CM		 210 err = 0;
211
1832a6d5
CM		 212 if (loops && start != extent_start)
213 goto not_found;
214
be20aa9d
CM		 215 if (start < extent_start || start >= extent_end)
216 goto not_found;
217
218 cow_end = min(end, extent_end - 1);
219 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
220 if (bytenr == 0)
221 goto not_found;
222
c31f8830
CM		 223 /*
224 * we may be called by the resizer, make sure we're inside
225 * the limits of the FS
226 */
227 if (bytenr + extent_num_bytes > total_fs_bytes)
228 goto not_found;
229
be20aa9d
CM		 230 if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) {
231 goto not_found;
232 }
233
234 start = extent_end;
bd09835d 235 } else {
be20aa9d
CM		 236 goto not_found;
237 }
238loop:
239 if (start > end) {
240 btrfs_free_path(path);
241 return 0;
242 }
243 btrfs_release_path(root, path);
1832a6d5 244 loops++;
be20aa9d
CM		 245 goto again;
246
247not_found:
248 cow_file_range(inode, start, cow_end);
249 start = cow_end + 1;
250 goto loop;
251}
252
253static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
254{
255 struct btrfs_root *root = BTRFS_I(inode)->root;
256 int ret;
be20aa9d 257 mutex_lock(&root->fs_info->fs_mutex);
b98b6767
Y		 258 if (btrfs_test_opt(root, NODATACOW) ||
259 btrfs_test_flag(inode, NODATACOW))
be20aa9d
CM		 260 ret = run_delalloc_nocow(inode, start, end);
261 else
262 ret = cow_file_range(inode, start, end);
1832a6d5 263
b888db2b
CM		 264 mutex_unlock(&root->fs_info->fs_mutex);
265 return ret;
266}
267
291d673e 268int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
b0c68f8b 269 unsigned long old, unsigned long bits)
291d673e 270{
b0c68f8b 271 if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
291d673e
CM		 272 struct btrfs_root *root = BTRFS_I(inode)->root;
273 spin_lock(&root->fs_info->delalloc_lock);
9069218d 274 BTRFS_I(inode)->delalloc_bytes += end - start + 1;
291d673e
CM		 275 root->fs_info->delalloc_bytes += end - start + 1;
276 spin_unlock(&root->fs_info->delalloc_lock);
277 }
278 return 0;
279}
280
281int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
b0c68f8b 282 unsigned long old, unsigned long bits)
291d673e 283{
b0c68f8b 284 if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
291d673e
CM		 285 struct btrfs_root *root = BTRFS_I(inode)->root;
286 spin_lock(&root->fs_info->delalloc_lock);
b0c68f8b
CM		 287 if (end - start + 1 > root->fs_info->delalloc_bytes) {
288 printk("warning: delalloc account %Lu %Lu\n",
289 end - start + 1, root->fs_info->delalloc_bytes);
290 root->fs_info->delalloc_bytes = 0;
9069218d 291 BTRFS_I(inode)->delalloc_bytes = 0;
b0c68f8b
CM		 292 } else {
293 root->fs_info->delalloc_bytes -= end - start + 1;
9069218d 294 BTRFS_I(inode)->delalloc_bytes -= end - start + 1;
b0c68f8b 295 }
291d673e
CM		 296 spin_unlock(&root->fs_info->delalloc_lock);
297 }
298 return 0;
299}
300
239b14b3
CM		 301int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
302 size_t size, struct bio *bio)
303{
304 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
305 struct btrfs_mapping_tree *map_tree;
239b14b3 306 u64 logical = bio->bi_sector << 9;
239b14b3
CM		 307 u64 length = 0;
308 u64 map_length;
309 struct bio_vec *bvec;
310 int i;
311 int ret;
312
313 bio_for_each_segment(bvec, bio, i) {
314 length += bvec->bv_len;
315 }
316 map_tree = &root->fs_info->mapping_tree;
317 map_length = length;
cea9e445 318 ret = btrfs_map_block(map_tree, READ, logical,
f188591e 319 &map_length, NULL, 0);
cea9e445 320
239b14b3 321 if (map_length < length + size) {
239b14b3
CM		 322 return 1;
323 }
324 return 0;
325}
326
f188591e
CM		 327int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
328 int mirror_num)
065631f6 329{
065631f6
CM		 330 struct btrfs_root *root = BTRFS_I(inode)->root;
331 struct btrfs_trans_handle *trans;
332 int ret = 0;
333
22c59948
CM		 334 if (!(rw & (1 << BIO_RW))) {
335 ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
336 BUG_ON(ret);
0b86a832
CM		 337 goto mapit;
338 }
065631f6
CM		 339
340 if (btrfs_test_opt(root, NODATASUM) ||
0b86a832
CM		 341 btrfs_test_flag(inode, NODATASUM)) {
342 goto mapit;
343 }
065631f6
CM		 344
345 mutex_lock(&root->fs_info->fs_mutex);
346 trans = btrfs_start_transaction(root, 1);
347 btrfs_set_trans_block_group(trans, inode);
348 btrfs_csum_file_blocks(trans, root, inode, bio);
349 ret = btrfs_end_transaction(trans, root);
350 BUG_ON(ret);
351 mutex_unlock(&root->fs_info->fs_mutex);
0b86a832 352mapit:
f188591e 353 return btrfs_map_bio(root, rw, bio, mirror_num);
065631f6 354}
6885f308 355
07157aac
CM		 356int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
357{
358 int ret = 0;
359 struct inode *inode = page->mapping->host;
360 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 361 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
07157aac
CM		 362 struct btrfs_csum_item *item;
363 struct btrfs_path *path = NULL;
ff79f819 364 u32 csum;
b98b6767
Y		 365 if (btrfs_test_opt(root, NODATASUM) ||
366 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 367 return 0;
07157aac
CM		 368 mutex_lock(&root->fs_info->fs_mutex);
369 path = btrfs_alloc_path();
370 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
371 if (IS_ERR(item)) {
372 ret = PTR_ERR(item);
373 /* a csum that isn't present is a preallocated region. */
374 if (ret == -ENOENT || ret == -EFBIG)
375 ret = 0;
ff79f819 376 csum = 0;
aadfeb6e 377 printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start);
07157aac
CM		 378 goto out;
379 }
ff79f819
CM		 380 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
381 BTRFS_CRC32_SIZE);
d1310b2e 382 set_state_private(io_tree, start, csum);
07157aac
CM		 383out:
384 if (path)
385 btrfs_free_path(path);
386 mutex_unlock(&root->fs_info->fs_mutex);
387 return ret;
388}
389
7e38326f
CM		 390struct io_failure_record {
391 struct page *page;
392 u64 start;
393 u64 len;
394 u64 logical;
395 int last_mirror;
396};
397
398int btrfs_readpage_io_failed_hook(struct bio *failed_bio,
399 struct page *page, u64 start, u64 end,
400 struct extent_state *state)
401{
402 struct io_failure_record *failrec = NULL;
403 u64 private;
404 struct extent_map *em;
405 struct inode *inode = page->mapping->host;
406 struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree;
407 struct bio *bio;
408 int num_copies;
409 int ret;
410 u64 logical;
411
412 ret = get_state_private(failure_tree, start, &private);
413 if (ret) {
414 size_t pg_offset = start - page_offset(page);
415 failrec = kmalloc(sizeof(*failrec), GFP_NOFS);
416 if (!failrec)
417 return -ENOMEM;
418 failrec->start = start;
419 failrec->len = end - start + 1;
420 failrec->last_mirror = 0;
421
422 em = btrfs_get_extent(inode, NULL, pg_offset, start,
423 failrec->len, 0);
424
425 if (!em || IS_ERR(em)) {
426 kfree(failrec);
427 return -EIO;
428 }
429 logical = start - em->start;
430 logical = em->block_start + logical;
431 failrec->logical = logical;
432 free_extent_map(em);
433 set_extent_bits(failure_tree, start, end, EXTENT_LOCKED |
434 EXTENT_DIRTY, GFP_NOFS);
587f7704
CM		 435 set_state_private(failure_tree, start,
436 (u64)(unsigned long)failrec);
7e38326f 437 } else {
587f7704 438 failrec = (struct io_failure_record *)(unsigned long)private;
7e38326f
CM		 439 }
440 num_copies = btrfs_num_copies(
441 &BTRFS_I(inode)->root->fs_info->mapping_tree,
442 failrec->logical, failrec->len);
443 failrec->last_mirror++;
444 if (!state) {
445 spin_lock_irq(&BTRFS_I(inode)->io_tree.lock);
446 state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree,
447 failrec->start,
448 EXTENT_LOCKED);
449 if (state && state->start != failrec->start)
450 state = NULL;
451 spin_unlock_irq(&BTRFS_I(inode)->io_tree.lock);
452 }
453 if (!state || failrec->last_mirror > num_copies) {
454 set_state_private(failure_tree, failrec->start, 0);
455 clear_extent_bits(failure_tree, failrec->start,
456 failrec->start + failrec->len - 1,
457 EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS);
458 kfree(failrec);
459 return -EIO;
460 }
461 bio = bio_alloc(GFP_NOFS, 1);
462 bio->bi_private = state;
463 bio->bi_end_io = failed_bio->bi_end_io;
464 bio->bi_sector = failrec->logical >> 9;
465 bio->bi_bdev = failed_bio->bi_bdev;
466 bio_add_page(bio, page, failrec->len, start - page_offset(page));
467 btrfs_submit_bio_hook(inode, READ, bio, failrec->last_mirror);
468 return 0;
469}
470
70dec807
CM		 471int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
472 struct extent_state *state)
07157aac 473{
35ebb934 474 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
07157aac 475 struct inode *inode = page->mapping->host;
d1310b2e 476 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
07157aac 477 char *kaddr;
aadfeb6e 478 u64 private = ~(u32)0;
07157aac 479 int ret;
ff79f819
CM		 480 struct btrfs_root *root = BTRFS_I(inode)->root;
481 u32 csum = ~(u32)0;
bbf0d006 482 unsigned long flags;
d1310b2e 483
b98b6767
Y		 484 if (btrfs_test_opt(root, NODATASUM) ||
485 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 486 return 0;
c2e639f0 487 if (state && state->start == start) {
70dec807
CM		 488 private = state->private;
489 ret = 0;
490 } else {
491 ret = get_state_private(io_tree, start, &private);
492 }
bbf0d006 493 local_irq_save(flags);
07157aac
CM		 494 kaddr = kmap_atomic(page, KM_IRQ0);
495 if (ret) {
496 goto zeroit;
497 }
ff79f819
CM		 498 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
499 btrfs_csum_final(csum, (char *)&csum);
500 if (csum != private) {
07157aac
CM		 501 goto zeroit;
502 }
503 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 504 local_irq_restore(flags);
7e38326f
CM		 505
506 /* if the io failure tree for this inode is non-empty,
507 * check to see if we've recovered from a failed IO
508 */
509 private = 0;
510 if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private,
511 (u64)-1, 1, EXTENT_DIRTY)) {
512 u64 private_failure;
513 struct io_failure_record *failure;
514 ret = get_state_private(&BTRFS_I(inode)->io_failure_tree,
515 start, &private_failure);
516 if (ret == 0) {
587f7704
CM		 517 failure = (struct io_failure_record *)(unsigned long)
518 private_failure;
7e38326f
CM		 519 set_state_private(&BTRFS_I(inode)->io_failure_tree,
520 failure->start, 0);
521 clear_extent_bits(&BTRFS_I(inode)->io_failure_tree,
522 failure->start,
523 failure->start + failure->len - 1,
524 EXTENT_DIRTY | EXTENT_LOCKED,
525 GFP_NOFS);
526 kfree(failure);
527 }
528 }
07157aac
CM		 529 return 0;
530
531zeroit:
aadfeb6e
CM		 532 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
533 page->mapping->host->i_ino, (unsigned long long)start, csum,
534 private);
db94535d
CM		 535 memset(kaddr + offset, 1, end - start + 1);
536 flush_dcache_page(page);
07157aac 537 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 538 local_irq_restore(flags);
7e38326f 539 return -EIO;
07157aac 540}
b888db2b 541
39279cc3
CM		 542void btrfs_read_locked_inode(struct inode *inode)
543{
544 struct btrfs_path *path;
5f39d397 545 struct extent_buffer *leaf;
39279cc3 546 struct btrfs_inode_item *inode_item;
0b86a832 547 struct btrfs_timespec *tspec;
39279cc3
CM		 548 struct btrfs_root *root = BTRFS_I(inode)->root;
549 struct btrfs_key location;
550 u64 alloc_group_block;
618e21d5 551 u32 rdev;
39279cc3
CM		 552 int ret;
553
554 path = btrfs_alloc_path();
555 BUG_ON(!path);
39279cc3 556 mutex_lock(&root->fs_info->fs_mutex);
39279cc3 557 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
dc17ff8f 558
39279cc3 559 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
5f39d397 560 if (ret)
39279cc3 561 goto make_bad;
39279cc3 562
5f39d397
CM		 563 leaf = path->nodes[0];
564 inode_item = btrfs_item_ptr(leaf, path->slots[0],
565 struct btrfs_inode_item);
566
567 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
568 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
569 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
570 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
571 inode->i_size = btrfs_inode_size(leaf, inode_item);
572
573 tspec = btrfs_inode_atime(inode_item);
574 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
575 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
576
577 tspec = btrfs_inode_mtime(inode_item);
578 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
579 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
580
581 tspec = btrfs_inode_ctime(inode_item);
582 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
583 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
584
585 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
586 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
618e21d5 587 inode->i_rdev = 0;
5f39d397
CM		 588 rdev = btrfs_inode_rdev(leaf, inode_item);
589
590 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
39279cc3
CM		 591 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
592 alloc_group_block);
b98b6767 593 BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
e52ec0eb
CM		 594 if (!BTRFS_I(inode)->block_group) {
595 BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
0b86a832
CM		 596 NULL, 0,
597 BTRFS_BLOCK_GROUP_METADATA, 0);
e52ec0eb 598 }
39279cc3
CM		 599 btrfs_free_path(path);
600 inode_item = NULL;
601
602 mutex_unlock(&root->fs_info->fs_mutex);
603
604 switch (inode->i_mode & S_IFMT) {
39279cc3
CM		 605 case S_IFREG:
606 inode->i_mapping->a_ops = &btrfs_aops;
04160088 607 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
d1310b2e 608 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 609 inode->i_fop = &btrfs_file_operations;
610 inode->i_op = &btrfs_file_inode_operations;
611 break;
612 case S_IFDIR:
613 inode->i_fop = &btrfs_dir_file_operations;
614 if (root == root->fs_info->tree_root)
615 inode->i_op = &btrfs_dir_ro_inode_operations;
616 else
617 inode->i_op = &btrfs_dir_inode_operations;
618 break;
619 case S_IFLNK:
620 inode->i_op = &btrfs_symlink_inode_operations;
621 inode->i_mapping->a_ops = &btrfs_symlink_aops;
04160088 622 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3 623 break;
618e21d5
JB		 624 default:
625 init_special_inode(inode, inode->i_mode, rdev);
626 break;
39279cc3
CM		 627 }
628 return;
629
630make_bad:
631 btrfs_release_path(root, path);
632 btrfs_free_path(path);
633 mutex_unlock(&root->fs_info->fs_mutex);
634 make_bad_inode(inode);
635}
636
5f39d397
CM		 637static void fill_inode_item(struct extent_buffer *leaf,
638 struct btrfs_inode_item *item,
39279cc3
CM		 639 struct inode *inode)
640{
5f39d397
CM		 641 btrfs_set_inode_uid(leaf, item, inode->i_uid);
642 btrfs_set_inode_gid(leaf, item, inode->i_gid);
643 btrfs_set_inode_size(leaf, item, inode->i_size);
644 btrfs_set_inode_mode(leaf, item, inode->i_mode);
645 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
646
647 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
648 inode->i_atime.tv_sec);
649 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
650 inode->i_atime.tv_nsec);
651
652 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
653 inode->i_mtime.tv_sec);
654 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
655 inode->i_mtime.tv_nsec);
656
657 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
658 inode->i_ctime.tv_sec);
659 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
660 inode->i_ctime.tv_nsec);
661
662 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
663 btrfs_set_inode_generation(leaf, item, inode->i_generation);
664 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
b98b6767 665 btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
5f39d397 666 btrfs_set_inode_block_group(leaf, item,
39279cc3
CM		 667 BTRFS_I(inode)->block_group->key.objectid);
668}
669
a52d9a80 670int btrfs_update_inode(struct btrfs_trans_handle *trans,
39279cc3
CM		 671 struct btrfs_root *root,
672 struct inode *inode)
673{
674 struct btrfs_inode_item *inode_item;
675 struct btrfs_path *path;
5f39d397 676 struct extent_buffer *leaf;
39279cc3
CM		 677 int ret;
678
679 path = btrfs_alloc_path();
680 BUG_ON(!path);
39279cc3
CM		 681 ret = btrfs_lookup_inode(trans, root, path,
682 &BTRFS_I(inode)->location, 1);
683 if (ret) {
684 if (ret > 0)
685 ret = -ENOENT;
686 goto failed;
687 }
688
5f39d397
CM		 689 leaf = path->nodes[0];
690 inode_item = btrfs_item_ptr(leaf, path->slots[0],
39279cc3
CM		 691 struct btrfs_inode_item);
692
5f39d397
CM		 693 fill_inode_item(leaf, inode_item, inode);
694 btrfs_mark_buffer_dirty(leaf);
15ee9bc7 695 btrfs_set_inode_last_trans(trans, inode);
39279cc3
CM		 696 ret = 0;
697failed:
698 btrfs_release_path(root, path);
699 btrfs_free_path(path);
700 return ret;
701}
702
703
704static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
705 struct btrfs_root *root,
706 struct inode *dir,
707 struct dentry *dentry)
708{
709 struct btrfs_path *path;
710 const char *name = dentry->d_name.name;
711 int name_len = dentry->d_name.len;
712 int ret = 0;
5f39d397 713 struct extent_buffer *leaf;
39279cc3 714 struct btrfs_dir_item *di;
5f39d397 715 struct btrfs_key key;
39279cc3
CM		 716
717 path = btrfs_alloc_path();
54aa1f4d
CM		 718 if (!path) {
719 ret = -ENOMEM;
720 goto err;
721 }
722
39279cc3
CM		 723 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
724 name, name_len, -1);
725 if (IS_ERR(di)) {
726 ret = PTR_ERR(di);
727 goto err;
728 }
729 if (!di) {
730 ret = -ENOENT;
731 goto err;
732 }
5f39d397
CM		 733 leaf = path->nodes[0];
734 btrfs_dir_item_key_to_cpu(leaf, di, &key);
39279cc3 735 ret = btrfs_delete_one_dir_name(trans, root, path, di);
54aa1f4d
CM		 736 if (ret)
737 goto err;
39279cc3
CM		 738 btrfs_release_path(root, path);
739
740 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
5f39d397 741 key.objectid, name, name_len, -1);
39279cc3
CM		 742 if (IS_ERR(di)) {
743 ret = PTR_ERR(di);
744 goto err;
745 }
746 if (!di) {
747 ret = -ENOENT;
748 goto err;
749 }
750 ret = btrfs_delete_one_dir_name(trans, root, path, di);
39279cc3
CM		 751
752 dentry->d_inode->i_ctime = dir->i_ctime;
76fea00a
CM		 753 ret = btrfs_del_inode_ref(trans, root, name, name_len,
754 dentry->d_inode->i_ino,
755 dentry->d_parent->d_inode->i_ino);
756 if (ret) {
757 printk("failed to delete reference to %.*s, "
758 "inode %lu parent %lu\n", name_len, name,
759 dentry->d_inode->i_ino,
760 dentry->d_parent->d_inode->i_ino);
3954401f 761 }
39279cc3
CM		 762err:
763 btrfs_free_path(path);
764 if (!ret) {
765 dir->i_size -= name_len * 2;
79c44584 766 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
39279cc3 767 btrfs_update_inode(trans, root, dir);
6da6abae
CM		 768#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
769 dentry->d_inode->i_nlink--;
770#else
39279cc3 771 drop_nlink(dentry->d_inode);
6da6abae 772#endif
54aa1f4d 773 ret = btrfs_update_inode(trans, root, dentry->d_inode);
39279cc3
CM		 774 dir->i_sb->s_dirt = 1;
775 }
776 return ret;
777}
778
779static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
780{
781 struct btrfs_root *root;
782 struct btrfs_trans_handle *trans;
2da98f00 783 struct inode *inode = dentry->d_inode;
39279cc3 784 int ret;
1832a6d5 785 unsigned long nr = 0;
39279cc3
CM		 786
787 root = BTRFS_I(dir)->root;
788 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 789
790 ret = btrfs_check_free_space(root, 1, 1);
791 if (ret)
792 goto fail;
793
39279cc3 794 trans = btrfs_start_transaction(root, 1);
5f39d397 795
39279cc3
CM		 796 btrfs_set_trans_block_group(trans, dir);
797 ret = btrfs_unlink_trans(trans, root, dir, dentry);
d3c2fdcf 798 nr = trans->blocks_used;
5f39d397 799
2da98f00
CM		 800 if (inode->i_nlink == 0) {
801 int found;
802 /* if the inode isn't linked anywhere,
803 * we don't need to worry about
804 * data=ordered
805 */
806 found = btrfs_del_ordered_inode(inode);
807 if (found == 1) {
808 atomic_dec(&inode->i_count);
809 }
810 }
811
39279cc3 812 btrfs_end_transaction(trans, root);
1832a6d5 813fail:
39279cc3 814 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 815 btrfs_btree_balance_dirty(root, nr);
e2008b61 816 btrfs_throttle(root);
39279cc3
CM		 817 return ret;
818}
819
820static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
821{
822 struct inode *inode = dentry->d_inode;
1832a6d5 823 int err = 0;
39279cc3
CM		 824 int ret;
825 struct btrfs_root *root = BTRFS_I(dir)->root;
39279cc3 826 struct btrfs_trans_handle *trans;
1832a6d5 827 unsigned long nr = 0;
39279cc3 828
134d4512
Y		 829 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
830 return -ENOTEMPTY;
831
39279cc3 832 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 833 ret = btrfs_check_free_space(root, 1, 1);
834 if (ret)
835 goto fail;
836
39279cc3
CM		 837 trans = btrfs_start_transaction(root, 1);
838 btrfs_set_trans_block_group(trans, dir);
39279cc3
CM		 839
840 /* now the directory is empty */
841 err = btrfs_unlink_trans(trans, root, dir, dentry);
842 if (!err) {
843 inode->i_size = 0;
844 }
3954401f 845
d3c2fdcf 846 nr = trans->blocks_used;
39279cc3 847 ret = btrfs_end_transaction(trans, root);
1832a6d5 848fail:
134d4512 849 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 850 btrfs_btree_balance_dirty(root, nr);
e2008b61 851 btrfs_throttle(root);
3954401f 852
39279cc3
CM		 853 if (ret && !err)
854 err = ret;
855 return err;
856}
857
39279cc3
CM		 858/*
859 * this can truncate away extent items, csum items and directory items.
860 * It starts at a high offset and removes keys until it can't find
861 * any higher than i_size.
862 *
863 * csum items that cross the new i_size are truncated to the new size
864 * as well.
865 */
866static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
867 struct btrfs_root *root,
85e21bac
CM		 868 struct inode *inode,
869 u32 min_type)
39279cc3
CM		 870{
871 int ret;
872 struct btrfs_path *path;
873 struct btrfs_key key;
5f39d397 874 struct btrfs_key found_key;
39279cc3 875 u32 found_type;
5f39d397 876 struct extent_buffer *leaf;
39279cc3
CM		 877 struct btrfs_file_extent_item *fi;
878 u64 extent_start = 0;
db94535d 879 u64 extent_num_bytes = 0;
39279cc3 880 u64 item_end = 0;
7bb86316 881 u64 root_gen = 0;
d8d5f3e1 882 u64 root_owner = 0;
39279cc3
CM		 883 int found_extent;
884 int del_item;
85e21bac
CM		 885 int pending_del_nr = 0;
886 int pending_del_slot = 0;
179e29e4 887 int extent_type = -1;
39279cc3 888
a52d9a80 889 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
39279cc3 890 path = btrfs_alloc_path();
3c69faec 891 path->reada = -1;
39279cc3 892 BUG_ON(!path);
5f39d397 893
39279cc3
CM		 894 /* FIXME, add redo link to tree so we don't leak on crash */
895 key.objectid = inode->i_ino;
896 key.offset = (u64)-1;
5f39d397
CM		 897 key.type = (u8)-1;
898
85e21bac
CM		 899 btrfs_init_path(path);
900search_again:
901 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
902 if (ret < 0) {
903 goto error;
904 }
905 if (ret > 0) {
906 BUG_ON(path->slots[0] == 0);
907 path->slots[0]--;
908 }
909
39279cc3 910 while(1) {
39279cc3 911 fi = NULL;
5f39d397
CM		 912 leaf = path->nodes[0];
913 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
914 found_type = btrfs_key_type(&found_key);
39279cc3 915
5f39d397 916 if (found_key.objectid != inode->i_ino)
39279cc3 917 break;
5f39d397 918
85e21bac 919 if (found_type < min_type)
39279cc3
CM		 920 break;
921
5f39d397 922 item_end = found_key.offset;
39279cc3 923 if (found_type == BTRFS_EXTENT_DATA_KEY) {
5f39d397 924 fi = btrfs_item_ptr(leaf, path->slots[0],
39279cc3 925 struct btrfs_file_extent_item);
179e29e4
CM		 926 extent_type = btrfs_file_extent_type(leaf, fi);
927 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
5f39d397 928 item_end +=
db94535d 929 btrfs_file_extent_num_bytes(leaf, fi);
179e29e4
CM		 930 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
931 struct btrfs_item *item = btrfs_item_nr(leaf,
932 path->slots[0]);
933 item_end += btrfs_file_extent_inline_len(leaf,
934 item);
39279cc3 935 }
008630c1 936 item_end--;
39279cc3
CM		 937 }
938 if (found_type == BTRFS_CSUM_ITEM_KEY) {
939 ret = btrfs_csum_truncate(trans, root, path,
940 inode->i_size);
941 BUG_ON(ret);
942 }
008630c1 943 if (item_end < inode->i_size) {
b888db2b
CM		 944 if (found_type == BTRFS_DIR_ITEM_KEY) {
945 found_type = BTRFS_INODE_ITEM_KEY;
946 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
947 found_type = BTRFS_CSUM_ITEM_KEY;
85e21bac
CM		 948 } else if (found_type == BTRFS_EXTENT_DATA_KEY) {
949 found_type = BTRFS_XATTR_ITEM_KEY;
950 } else if (found_type == BTRFS_XATTR_ITEM_KEY) {
951 found_type = BTRFS_INODE_REF_KEY;
b888db2b
CM		 952 } else if (found_type) {
953 found_type--;
954 } else {
955 break;
39279cc3 956 }
a61721d5 957 btrfs_set_key_type(&key, found_type);
85e21bac 958 goto next;
39279cc3 959 }
5f39d397 960 if (found_key.offset >= inode->i_size)
39279cc3
CM		 961 del_item = 1;
962 else
963 del_item = 0;
964 found_extent = 0;
965
966 /* FIXME, shrink the extent if the ref count is only 1 */
179e29e4
CM		 967 if (found_type != BTRFS_EXTENT_DATA_KEY)
968 goto delete;
969
970 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
39279cc3 971 u64 num_dec;
db94535d 972 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
39279cc3 973 if (!del_item) {
db94535d
CM		 974 u64 orig_num_bytes =
975 btrfs_file_extent_num_bytes(leaf, fi);
976 extent_num_bytes = inode->i_size -
5f39d397 977 found_key.offset + root->sectorsize - 1;
b1632b10
Y		 978 extent_num_bytes = extent_num_bytes &
979 ~((u64)root->sectorsize - 1);
db94535d
CM		 980 btrfs_set_file_extent_num_bytes(leaf, fi,
981 extent_num_bytes);
982 num_dec = (orig_num_bytes -
9069218d
CM		 983 extent_num_bytes);
984 if (extent_start != 0)
985 dec_i_blocks(inode, num_dec);
5f39d397 986 btrfs_mark_buffer_dirty(leaf);
39279cc3 987 } else {
db94535d
CM		 988 extent_num_bytes =
989 btrfs_file_extent_disk_num_bytes(leaf,
990 fi);
39279cc3 991 /* FIXME blocksize != 4096 */
9069218d 992 num_dec = btrfs_file_extent_num_bytes(leaf, fi);
39279cc3
CM		 993 if (extent_start != 0) {
994 found_extent = 1;
9069218d 995 dec_i_blocks(inode, num_dec);
39279cc3 996 }
d8d5f3e1
CM		 997 root_gen = btrfs_header_generation(leaf);
998 root_owner = btrfs_header_owner(leaf);
39279cc3 999 }
9069218d
CM		 1000 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
1001 if (!del_item) {
1002 u32 newsize = inode->i_size - found_key.offset;
1003 dec_i_blocks(inode, item_end + 1 -
1004 found_key.offset - newsize);
1005 newsize =
1006 btrfs_file_extent_calc_inline_size(newsize);
1007 ret = btrfs_truncate_item(trans, root, path,
1008 newsize, 1);
1009 BUG_ON(ret);
1010 } else {
1011 dec_i_blocks(inode, item_end + 1 -
1012 found_key.offset);
1013 }
39279cc3 1014 }
179e29e4 1015delete:
39279cc3 1016 if (del_item) {
85e21bac
CM		 1017 if (!pending_del_nr) {
1018 /* no pending yet, add ourselves */
1019 pending_del_slot = path->slots[0];
1020 pending_del_nr = 1;
1021 } else if (pending_del_nr &&
1022 path->slots[0] + 1 == pending_del_slot) {
1023 /* hop on the pending chunk */
1024 pending_del_nr++;
1025 pending_del_slot = path->slots[0];
1026 } else {
1027 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot);
1028 }
39279cc3
CM		 1029 } else {
1030 break;
1031 }
39279cc3
CM		 1032 if (found_extent) {
1033 ret = btrfs_free_extent(trans, root, extent_start,
7bb86316 1034 extent_num_bytes,
d8d5f3e1 1035 root_owner,
7bb86316
CM		 1036 root_gen, inode->i_ino,
1037 found_key.offset, 0);
39279cc3
CM		 1038 BUG_ON(ret);
1039 }
85e21bac
CM		 1040next:
1041 if (path->slots[0] == 0) {
1042 if (pending_del_nr)
1043 goto del_pending;
1044 btrfs_release_path(root, path);
1045 goto search_again;
1046 }
1047
1048 path->slots[0]--;
1049 if (pending_del_nr &&
1050 path->slots[0] + 1 != pending_del_slot) {
1051 struct btrfs_key debug;
1052del_pending:
1053 btrfs_item_key_to_cpu(path->nodes[0], &debug,
1054 pending_del_slot);
1055 ret = btrfs_del_items(trans, root, path,
1056 pending_del_slot,
1057 pending_del_nr);
1058 BUG_ON(ret);
1059 pending_del_nr = 0;
1060 btrfs_release_path(root, path);
1061 goto search_again;
1062 }
39279cc3
CM		 1063 }
1064 ret = 0;
1065error:
85e21bac
CM		 1066 if (pending_del_nr) {
1067 ret = btrfs_del_items(trans, root, path, pending_del_slot,
1068 pending_del_nr);
1069 }
39279cc3
CM		 1070 btrfs_release_path(root, path);
1071 btrfs_free_path(path);
1072 inode->i_sb->s_dirt = 1;
1073 return ret;
1074}
1075
b888db2b 1076static int btrfs_cow_one_page(struct inode *inode, struct page *page,
a52d9a80
CM		 1077 size_t zero_start)
1078{
1079 char *kaddr;
d1310b2e 1080 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
35ebb934 1081 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
b888db2b 1082 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
1832a6d5 1083 int ret = 0;
a52d9a80 1084
190662b2 1085 WARN_ON(!PageLocked(page));
b3cfa35a 1086 set_page_extent_mapped(page);
a52d9a80 1087
d1310b2e 1088 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
d1310b2e 1089 set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start,
b888db2b 1090 page_end, GFP_NOFS);
1832a6d5 1091
a52d9a80 1092 if (zero_start != PAGE_CACHE_SIZE) {
b888db2b 1093 kaddr = kmap(page);
a52d9a80
CM		 1094 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
1095 flush_dcache_page(page);
b888db2b 1096 kunmap(page);
a52d9a80 1097 }
b888db2b 1098 set_page_dirty(page);
d1310b2e 1099 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
a52d9a80 1100
a52d9a80
CM		 1101 return ret;
1102}
1103
39279cc3
CM		 1104/*
1105 * taken from block_truncate_page, but does cow as it zeros out
1106 * any bytes left in the last page in the file.
1107 */
1108static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
1109{
1110 struct inode *inode = mapping->host;
db94535d
CM		 1111 struct btrfs_root *root = BTRFS_I(inode)->root;
1112 u32 blocksize = root->sectorsize;
39279cc3
CM		 1113 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1114 unsigned offset = from & (PAGE_CACHE_SIZE-1);
1115 struct page *page;
39279cc3 1116 int ret = 0;
a52d9a80 1117 u64 page_start;
39279cc3
CM		 1118
1119 if ((offset & (blocksize - 1)) == 0)
1120 goto out;
1121
1122 ret = -ENOMEM;
1123 page = grab_cache_page(mapping, index);
1124 if (!page)
1125 goto out;
39279cc3 1126 if (!PageUptodate(page)) {
9ebefb18 1127 ret = btrfs_readpage(NULL, page);
39279cc3
CM		 1128 lock_page(page);
1129 if (!PageUptodate(page)) {
1130 ret = -EIO;
1131 goto out;
1132 }
1133 }
35ebb934 1134 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 1135
b888db2b 1136 ret = btrfs_cow_one_page(inode, page, offset);
39279cc3 1137
39279cc3
CM		 1138 unlock_page(page);
1139 page_cache_release(page);
1140out:
1141 return ret;
1142}
1143
1144static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
1145{
1146 struct inode *inode = dentry->d_inode;
1147 int err;
1148
1149 err = inode_change_ok(inode, attr);
1150 if (err)
1151 return err;
1152
1153 if (S_ISREG(inode->i_mode) &&
1154 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
1155 struct btrfs_trans_handle *trans;
1156 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 1157 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2bf5a725 1158
5f39d397 1159 u64 mask = root->sectorsize - 1;
1b0f7c29 1160 u64 hole_start = (inode->i_size + mask) & ~mask;
f392a938 1161 u64 block_end = (attr->ia_size + mask) & ~mask;
39279cc3 1162 u64 hole_size;
179e29e4 1163 u64 alloc_hint = 0;
39279cc3 1164
1b0f7c29 1165 if (attr->ia_size <= hole_start)
39279cc3
CM		 1166 goto out;
1167
1832a6d5
CM		 1168 mutex_lock(&root->fs_info->fs_mutex);
1169 err = btrfs_check_free_space(root, 1, 0);
1170 mutex_unlock(&root->fs_info->fs_mutex);
1171 if (err)
1172 goto fail;
1173
39279cc3
CM		 1174 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1175
1b0f7c29 1176 lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
5f56406a 1177 hole_size = block_end - hole_start;
39279cc3
CM		 1178
1179 mutex_lock(&root->fs_info->fs_mutex);
1180 trans = btrfs_start_transaction(root, 1);
1181 btrfs_set_trans_block_group(trans, inode);
2bf5a725 1182 err = btrfs_drop_extents(trans, root, inode,
1b0f7c29 1183 hole_start, block_end, hole_start,
3326d1b0 1184 &alloc_hint);
2bf5a725 1185
179e29e4
CM		 1186 if (alloc_hint != EXTENT_MAP_INLINE) {
1187 err = btrfs_insert_file_extent(trans, root,
1188 inode->i_ino,
5f56406a
CM		 1189 hole_start, 0, 0,
1190 hole_size);
d1310b2e
CM		 1191 btrfs_drop_extent_cache(inode, hole_start,
1192 hole_size - 1);
5f56406a 1193 btrfs_check_file(root, inode);
179e29e4 1194 }
39279cc3
CM		 1195 btrfs_end_transaction(trans, root);
1196 mutex_unlock(&root->fs_info->fs_mutex);
1b0f7c29 1197 unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
54aa1f4d
CM		 1198 if (err)
1199 return err;
39279cc3
CM		 1200 }
1201out:
1202 err = inode_setattr(inode, attr);
1832a6d5 1203fail:
39279cc3
CM		 1204 return err;
1205}
61295eb8 1206
2da98f00 1207void btrfs_put_inode(struct inode *inode)
61295eb8 1208{
2da98f00
CM		 1209 int ret;
1210
1211 if (!BTRFS_I(inode)->ordered_trans) {
61295eb8
CM		 1212 return;
1213 }
2da98f00
CM		 1214
1215 if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
1216 mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))
1217 return;
1218
1219 ret = btrfs_del_ordered_inode(inode);
1220 if (ret == 1) {
1221 atomic_dec(&inode->i_count);
1222 }
61295eb8
CM		 1223}
1224
39279cc3
CM		 1225void btrfs_delete_inode(struct inode *inode)
1226{
1227 struct btrfs_trans_handle *trans;
1228 struct btrfs_root *root = BTRFS_I(inode)->root;
d3c2fdcf 1229 unsigned long nr;
39279cc3
CM		 1230 int ret;
1231
1232 truncate_inode_pages(&inode->i_data, 0);
1233 if (is_bad_inode(inode)) {
1234 goto no_delete;
1235 }
5f39d397 1236
39279cc3
CM		 1237 inode->i_size = 0;
1238 mutex_lock(&root->fs_info->fs_mutex);
1239 trans = btrfs_start_transaction(root, 1);
5f39d397 1240
39279cc3 1241 btrfs_set_trans_block_group(trans, inode);
85e21bac 1242 ret = btrfs_truncate_in_trans(trans, root, inode, 0);
54aa1f4d
CM		 1243 if (ret)
1244 goto no_delete_lock;
85e21bac 1245
d3c2fdcf 1246 nr = trans->blocks_used;
85e21bac 1247 clear_inode(inode);
5f39d397 1248
39279cc3
CM		 1249 btrfs_end_transaction(trans, root);
1250 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1251 btrfs_btree_balance_dirty(root, nr);
e2008b61 1252 btrfs_throttle(root);
39279cc3 1253 return;
54aa1f4d
CM		 1254
1255no_delete_lock:
d3c2fdcf 1256 nr = trans->blocks_used;
54aa1f4d
CM		 1257 btrfs_end_transaction(trans, root);
1258 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1259 btrfs_btree_balance_dirty(root, nr);
e2008b61 1260 btrfs_throttle(root);
39279cc3
CM		 1261no_delete:
1262 clear_inode(inode);
1263}
1264
1265/*
1266 * this returns the key found in the dir entry in the location pointer.
1267 * If no dir entries were found, location->objectid is 0.
1268 */
1269static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1270 struct btrfs_key *location)
1271{
1272 const char *name = dentry->d_name.name;
1273 int namelen = dentry->d_name.len;
1274 struct btrfs_dir_item *di;
1275 struct btrfs_path *path;
1276 struct btrfs_root *root = BTRFS_I(dir)->root;
0d9f7f3e 1277 int ret = 0;
39279cc3 1278
3954401f
CM		 1279 if (namelen == 1 && strcmp(name, ".") == 0) {
1280 location->objectid = dir->i_ino;
1281 location->type = BTRFS_INODE_ITEM_KEY;
1282 location->offset = 0;
1283 return 0;
1284 }
39279cc3
CM		 1285 path = btrfs_alloc_path();
1286 BUG_ON(!path);
3954401f 1287
7a720536 1288 if (namelen == 2 && strcmp(name, "..") == 0) {
3954401f
CM		 1289 struct btrfs_key key;
1290 struct extent_buffer *leaf;
1291 u32 nritems;
1292 int slot;
1293
1294 key.objectid = dir->i_ino;
1295 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1296 key.offset = 0;
1297 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1298 BUG_ON(ret == 0);
1299 ret = 0;
1300
1301 leaf = path->nodes[0];
1302 slot = path->slots[0];
1303 nritems = btrfs_header_nritems(leaf);
1304 if (slot >= nritems)
1305 goto out_err;
1306
1307 btrfs_item_key_to_cpu(leaf, &key, slot);
1308 if (key.objectid != dir->i_ino ||
1309 key.type != BTRFS_INODE_REF_KEY) {
1310 goto out_err;
1311 }
1312 location->objectid = key.offset;
1313 location->type = BTRFS_INODE_ITEM_KEY;
1314 location->offset = 0;
1315 goto out;
1316 }
1317
39279cc3
CM		 1318 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1319 namelen, 0);
0d9f7f3e
Y		 1320 if (IS_ERR(di))
1321 ret = PTR_ERR(di);
39279cc3 1322 if (!di || IS_ERR(di)) {
3954401f 1323 goto out_err;
39279cc3 1324 }
5f39d397 1325 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
39279cc3 1326out:
39279cc3
CM		 1327 btrfs_free_path(path);
1328 return ret;
3954401f
CM		 1329out_err:
1330 location->objectid = 0;
1331 goto out;
39279cc3
CM		 1332}
1333
1334/*
1335 * when we hit a tree root in a directory, the btrfs part of the inode
1336 * needs to be changed to reflect the root directory of the tree root. This
1337 * is kind of like crossing a mount point.
1338 */
1339static int fixup_tree_root_location(struct btrfs_root *root,
1340 struct btrfs_key *location,
58176a96
JB		 1341 struct btrfs_root **sub_root,
1342 struct dentry *dentry)
39279cc3
CM		 1343{
1344 struct btrfs_path *path;
1345 struct btrfs_root_item *ri;
1346
1347 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1348 return 0;
1349 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1350 return 0;
1351
1352 path = btrfs_alloc_path();
1353 BUG_ON(!path);
1354 mutex_lock(&root->fs_info->fs_mutex);
1355
58176a96
JB		 1356 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1357 dentry->d_name.name,
1358 dentry->d_name.len);
39279cc3
CM		 1359 if (IS_ERR(*sub_root))
1360 return PTR_ERR(*sub_root);
1361
1362 ri = &(*sub_root)->root_item;
1363 location->objectid = btrfs_root_dirid(ri);
39279cc3
CM		 1364 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1365 location->offset = 0;
1366
1367 btrfs_free_path(path);
1368 mutex_unlock(&root->fs_info->fs_mutex);
1369 return 0;
1370}
1371
1372static int btrfs_init_locked_inode(struct inode *inode, void *p)
1373{
1374 struct btrfs_iget_args *args = p;
1375 inode->i_ino = args->ino;
1376 BTRFS_I(inode)->root = args->root;
9069218d 1377 BTRFS_I(inode)->delalloc_bytes = 0;
d1310b2e
CM		 1378 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1379 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
b888db2b 1380 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 1381 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1382 inode->i_mapping, GFP_NOFS);
39279cc3
CM		 1383 return 0;
1384}
1385
1386static int btrfs_find_actor(struct inode *inode, void *opaque)
1387{
1388 struct btrfs_iget_args *args = opaque;
1389 return (args->ino == inode->i_ino &&
1390 args->root == BTRFS_I(inode)->root);
1391}
1392
dc17ff8f
CM		 1393struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1394 u64 root_objectid)
1395{
1396 struct btrfs_iget_args args;
1397 args.ino = objectid;
1398 args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);
1399
1400 if (!args.root)
1401 return NULL;
1402
1403 return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
1404}
1405
39279cc3
CM		 1406struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1407 struct btrfs_root *root)
1408{
1409 struct inode *inode;
1410 struct btrfs_iget_args args;
1411 args.ino = objectid;
1412 args.root = root;
1413
1414 inode = iget5_locked(s, objectid, btrfs_find_actor,
1415 btrfs_init_locked_inode,
1416 (void *)&args);
1417 return inode;
1418}
1419
1420static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1421 struct nameidata *nd)
1422{
1423 struct inode * inode;
1424 struct btrfs_inode *bi = BTRFS_I(dir);
1425 struct btrfs_root *root = bi->root;
1426 struct btrfs_root *sub_root = root;
1427 struct btrfs_key location;
1428 int ret;
1429
1430 if (dentry->d_name.len > BTRFS_NAME_LEN)
1431 return ERR_PTR(-ENAMETOOLONG);
5f39d397 1432
39279cc3
CM		 1433 mutex_lock(&root->fs_info->fs_mutex);
1434 ret = btrfs_inode_by_name(dir, dentry, &location);
1435 mutex_unlock(&root->fs_info->fs_mutex);
5f39d397 1436
39279cc3
CM		 1437 if (ret < 0)
1438 return ERR_PTR(ret);
5f39d397 1439
39279cc3
CM		 1440 inode = NULL;
1441 if (location.objectid) {
58176a96
JB		 1442 ret = fixup_tree_root_location(root, &location, &sub_root,
1443 dentry);
39279cc3
CM		 1444 if (ret < 0)
1445 return ERR_PTR(ret);
1446 if (ret > 0)
1447 return ERR_PTR(-ENOENT);
1448 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1449 sub_root);
1450 if (!inode)
1451 return ERR_PTR(-EACCES);
1452 if (inode->i_state & I_NEW) {
1453 /* the inode and parent dir are two different roots */
1454 if (sub_root != root) {
1455 igrab(inode);
1456 sub_root->inode = inode;
1457 }
1458 BTRFS_I(inode)->root = sub_root;
1459 memcpy(&BTRFS_I(inode)->location, &location,
1460 sizeof(location));
1461 btrfs_read_locked_inode(inode);
1462 unlock_new_inode(inode);
1463 }
1464 }
1465 return d_splice_alias(inode, dentry);
1466}
1467
39279cc3
CM		 1468static unsigned char btrfs_filetype_table[] = {
1469 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1470};
1471
1472static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1473{
6da6abae 1474 struct inode *inode = filp->f_dentry->d_inode;
39279cc3
CM		 1475 struct btrfs_root *root = BTRFS_I(inode)->root;
1476 struct btrfs_item *item;
1477 struct btrfs_dir_item *di;
1478 struct btrfs_key key;
5f39d397 1479 struct btrfs_key found_key;
39279cc3
CM		 1480 struct btrfs_path *path;
1481 int ret;
1482 u32 nritems;
5f39d397 1483 struct extent_buffer *leaf;
39279cc3
CM		 1484 int slot;
1485 int advance;
1486 unsigned char d_type;
1487 int over = 0;
1488 u32 di_cur;
1489 u32 di_total;
1490 u32 di_len;
1491 int key_type = BTRFS_DIR_INDEX_KEY;
5f39d397
CM		 1492 char tmp_name[32];
1493 char *name_ptr;
1494 int name_len;
39279cc3
CM		 1495
1496 /* FIXME, use a real flag for deciding about the key type */
1497 if (root->fs_info->tree_root == root)
1498 key_type = BTRFS_DIR_ITEM_KEY;
5f39d397 1499
3954401f
CM		 1500 /* special case for "." */
1501 if (filp->f_pos == 0) {
1502 over = filldir(dirent, ".", 1,
1503 1, inode->i_ino,
1504 DT_DIR);
1505 if (over)
1506 return 0;
1507 filp->f_pos = 1;
1508 }
1509
39279cc3
CM		 1510 mutex_lock(&root->fs_info->fs_mutex);
1511 key.objectid = inode->i_ino;
3954401f
CM		 1512 path = btrfs_alloc_path();
1513 path->reada = 2;
1514
1515 /* special case for .., just use the back ref */
1516 if (filp->f_pos == 1) {
1517 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1518 key.offset = 0;
1519 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1520 BUG_ON(ret == 0);
1521 leaf = path->nodes[0];
1522 slot = path->slots[0];
1523 nritems = btrfs_header_nritems(leaf);
1524 if (slot >= nritems) {
1525 btrfs_release_path(root, path);
1526 goto read_dir_items;
1527 }
1528 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1529 btrfs_release_path(root, path);
1530 if (found_key.objectid != key.objectid ||
1531 found_key.type != BTRFS_INODE_REF_KEY)
1532 goto read_dir_items;
1533 over = filldir(dirent, "..", 2,
1534 2, found_key.offset, DT_DIR);
1535 if (over)
1536 goto nopos;
1537 filp->f_pos = 2;
1538 }
1539
1540read_dir_items:
39279cc3
CM		 1541 btrfs_set_key_type(&key, key_type);
1542 key.offset = filp->f_pos;
5f39d397 1543
39279cc3
CM		 1544 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1545 if (ret < 0)
1546 goto err;
1547 advance = 0;
39279cc3 1548 while(1) {
5f39d397
CM		 1549 leaf = path->nodes[0];
1550 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1551 slot = path->slots[0];
1552 if (advance || slot >= nritems) {
1553 if (slot >= nritems -1) {
39279cc3
CM		 1554 ret = btrfs_next_leaf(root, path);
1555 if (ret)
1556 break;
5f39d397
CM		 1557 leaf = path->nodes[0];
1558 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1559 slot = path->slots[0];
1560 } else {
1561 slot++;
1562 path->slots[0]++;
1563 }
1564 }
1565 advance = 1;
5f39d397
CM		 1566 item = btrfs_item_nr(leaf, slot);
1567 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1568
1569 if (found_key.objectid != key.objectid)
39279cc3 1570 break;
5f39d397 1571 if (btrfs_key_type(&found_key) != key_type)
39279cc3 1572 break;
5f39d397 1573 if (found_key.offset < filp->f_pos)
39279cc3 1574 continue;
5f39d397
CM		 1575
1576 filp->f_pos = found_key.offset;
39279cc3
CM		 1577 advance = 1;
1578 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1579 di_cur = 0;
5f39d397 1580 di_total = btrfs_item_size(leaf, item);
39279cc3 1581 while(di_cur < di_total) {
5f39d397
CM		 1582 struct btrfs_key location;
1583
1584 name_len = btrfs_dir_name_len(leaf, di);
1585 if (name_len < 32) {
1586 name_ptr = tmp_name;
1587 } else {
1588 name_ptr = kmalloc(name_len, GFP_NOFS);
1589 BUG_ON(!name_ptr);
1590 }
1591 read_extent_buffer(leaf, name_ptr,
1592 (unsigned long)(di + 1), name_len);
1593
1594 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1595 btrfs_dir_item_key_to_cpu(leaf, di, &location);
5f39d397
CM		 1596 over = filldir(dirent, name_ptr, name_len,
1597 found_key.offset,
1598 location.objectid,
39279cc3 1599 d_type);
5f39d397
CM		 1600
1601 if (name_ptr != tmp_name)
1602 kfree(name_ptr);
1603
39279cc3
CM		 1604 if (over)
1605 goto nopos;
5103e947
JB		 1606 di_len = btrfs_dir_name_len(leaf, di) +
1607 btrfs_dir_data_len(leaf, di) +sizeof(*di);
39279cc3
CM		 1608 di_cur += di_len;
1609 di = (struct btrfs_dir_item *)((char *)di + di_len);
1610 }
1611 }
5e591a07
YZ		 1612 if (key_type == BTRFS_DIR_INDEX_KEY)
1613 filp->f_pos = INT_LIMIT(typeof(filp->f_pos));
1614 else
1615 filp->f_pos++;
39279cc3
CM		 1616nopos:
1617 ret = 0;
1618err:
1619 btrfs_release_path(root, path);
1620 btrfs_free_path(path);
1621 mutex_unlock(&root->fs_info->fs_mutex);
1622 return ret;
1623}
1624
1625int btrfs_write_inode(struct inode *inode, int wait)
1626{
1627 struct btrfs_root *root = BTRFS_I(inode)->root;
1628 struct btrfs_trans_handle *trans;
1629 int ret = 0;
1630
1631 if (wait) {
1632 mutex_lock(&root->fs_info->fs_mutex);
1633 trans = btrfs_start_transaction(root, 1);
1634 btrfs_set_trans_block_group(trans, inode);
1635 ret = btrfs_commit_transaction(trans, root);
1636 mutex_unlock(&root->fs_info->fs_mutex);
1637 }
1638 return ret;
1639}
1640
1641/*
54aa1f4d 1642 * This is somewhat expensive, updating the tree every time the
39279cc3
CM		 1643 * inode changes. But, it is most likely to find the inode in cache.
1644 * FIXME, needs more benchmarking...there are no reasons other than performance
1645 * to keep or drop this code.
1646 */
1647void btrfs_dirty_inode(struct inode *inode)
1648{
1649 struct btrfs_root *root = BTRFS_I(inode)->root;
1650 struct btrfs_trans_handle *trans;
1651
1652 mutex_lock(&root->fs_info->fs_mutex);
1653 trans = btrfs_start_transaction(root, 1);
1654 btrfs_set_trans_block_group(trans, inode);
1655 btrfs_update_inode(trans, root, inode);
1656 btrfs_end_transaction(trans, root);
1657 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 1658}
1659
1660static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1661 struct btrfs_root *root,
9c58309d
CM		 1662 const char *name, int name_len,
1663 u64 ref_objectid,
39279cc3
CM		 1664 u64 objectid,
1665 struct btrfs_block_group_cache *group,
1666 int mode)
1667{
1668 struct inode *inode;
5f39d397 1669 struct btrfs_inode_item *inode_item;
6324fbf3 1670 struct btrfs_block_group_cache *new_inode_group;
39279cc3 1671 struct btrfs_key *location;
5f39d397 1672 struct btrfs_path *path;
9c58309d
CM		 1673 struct btrfs_inode_ref *ref;
1674 struct btrfs_key key[2];
1675 u32 sizes[2];
1676 unsigned long ptr;
39279cc3
CM		 1677 int ret;
1678 int owner;
1679
5f39d397
CM		 1680 path = btrfs_alloc_path();
1681 BUG_ON(!path);
1682
39279cc3
CM		 1683 inode = new_inode(root->fs_info->sb);
1684 if (!inode)
1685 return ERR_PTR(-ENOMEM);
1686
d1310b2e
CM		 1687 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1688 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
b888db2b 1689 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 1690 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1691 inode->i_mapping, GFP_NOFS);
9069218d 1692 BTRFS_I(inode)->delalloc_bytes = 0;
39279cc3 1693 BTRFS_I(inode)->root = root;
b888db2b 1694
39279cc3
CM		 1695 if (mode & S_IFDIR)
1696 owner = 0;
1697 else
1698 owner = 1;
6324fbf3 1699 new_inode_group = btrfs_find_block_group(root, group, 0,
0b86a832 1700 BTRFS_BLOCK_GROUP_METADATA, owner);
6324fbf3
CM		 1701 if (!new_inode_group) {
1702 printk("find_block group failed\n");
1703 new_inode_group = group;
1704 }
1705 BTRFS_I(inode)->block_group = new_inode_group;
b98b6767 1706 BTRFS_I(inode)->flags = 0;
9c58309d
CM		 1707
1708 key[0].objectid = objectid;
1709 btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY);
1710 key[0].offset = 0;
1711
1712 key[1].objectid = objectid;
1713 btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY);
1714 key[1].offset = ref_objectid;
1715
1716 sizes[0] = sizeof(struct btrfs_inode_item);
1717 sizes[1] = name_len + sizeof(*ref);
1718
1719 ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2);
1720 if (ret != 0)
5f39d397
CM		 1721 goto fail;
1722
9c58309d
CM		 1723 if (objectid > root->highest_inode)
1724 root->highest_inode = objectid;
1725
39279cc3
CM		 1726 inode->i_uid = current->fsuid;
1727 inode->i_gid = current->fsgid;
1728 inode->i_mode = mode;
1729 inode->i_ino = objectid;
1730 inode->i_blocks = 0;
1731 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
5f39d397
CM		 1732 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1733 struct btrfs_inode_item);
1734 fill_inode_item(path->nodes[0], inode_item, inode);
9c58309d
CM		 1735
1736 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
1737 struct btrfs_inode_ref);
1738 btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
1739 ptr = (unsigned long)(ref + 1);
1740 write_extent_buffer(path->nodes[0], name, ptr, name_len);
1741
5f39d397
CM		 1742 btrfs_mark_buffer_dirty(path->nodes[0]);
1743 btrfs_free_path(path);
1744
39279cc3
CM		 1745 location = &BTRFS_I(inode)->location;
1746 location->objectid = objectid;
39279cc3
CM		 1747 location->offset = 0;
1748 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1749
39279cc3
CM		 1750 insert_inode_hash(inode);
1751 return inode;
5f39d397
CM		 1752fail:
1753 btrfs_free_path(path);
1754 return ERR_PTR(ret);
39279cc3
CM		 1755}
1756
1757static inline u8 btrfs_inode_type(struct inode *inode)
1758{
1759 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1760}
1761
1762static int btrfs_add_link(struct btrfs_trans_handle *trans,
9c58309d
CM		 1763 struct dentry *dentry, struct inode *inode,
1764 int add_backref)
39279cc3
CM		 1765{
1766 int ret;
1767 struct btrfs_key key;
1768 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
79c44584 1769 struct inode *parent_inode;
5f39d397 1770
39279cc3 1771 key.objectid = inode->i_ino;
39279cc3
CM		 1772 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1773 key.offset = 0;
1774
1775 ret = btrfs_insert_dir_item(trans, root,
1776 dentry->d_name.name, dentry->d_name.len,
1777 dentry->d_parent->d_inode->i_ino,
1778 &key, btrfs_inode_type(inode));
1779 if (ret == 0) {
9c58309d
CM		 1780 if (add_backref) {
1781 ret = btrfs_insert_inode_ref(trans, root,
1782 dentry->d_name.name,
1783 dentry->d_name.len,
1784 inode->i_ino,
1785 dentry->d_parent->d_inode->i_ino);
1786 }
79c44584
CM		 1787 parent_inode = dentry->d_parent->d_inode;
1788 parent_inode->i_size += dentry->d_name.len * 2;
1789 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
39279cc3
CM		 1790 ret = btrfs_update_inode(trans, root,
1791 dentry->d_parent->d_inode);
1792 }
1793 return ret;
1794}
1795
1796static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
9c58309d
CM		 1797 struct dentry *dentry, struct inode *inode,
1798 int backref)
39279cc3 1799{
9c58309d 1800 int err = btrfs_add_link(trans, dentry, inode, backref);
39279cc3
CM		 1801 if (!err) {
1802 d_instantiate(dentry, inode);
1803 return 0;
1804 }
1805 if (err > 0)
1806 err = -EEXIST;
1807 return err;
1808}
1809
618e21d5
JB		 1810static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1811 int mode, dev_t rdev)
1812{
1813 struct btrfs_trans_handle *trans;
1814 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1815 struct inode *inode = NULL;
618e21d5
JB		 1816 int err;
1817 int drop_inode = 0;
1818 u64 objectid;
1832a6d5 1819 unsigned long nr = 0;
618e21d5
JB		 1820
1821 if (!new_valid_dev(rdev))
1822 return -EINVAL;
1823
1824 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1825 err = btrfs_check_free_space(root, 1, 0);
1826 if (err)
1827 goto fail;
1828
618e21d5
JB		 1829 trans = btrfs_start_transaction(root, 1);
1830 btrfs_set_trans_block_group(trans, dir);
1831
1832 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1833 if (err) {
1834 err = -ENOSPC;
1835 goto out_unlock;
1836 }
1837
9c58309d
CM		 1838 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1839 dentry->d_name.len,
1840 dentry->d_parent->d_inode->i_ino, objectid,
618e21d5
JB		 1841 BTRFS_I(dir)->block_group, mode);
1842 err = PTR_ERR(inode);
1843 if (IS_ERR(inode))
1844 goto out_unlock;
1845
1846 btrfs_set_trans_block_group(trans, inode);
9c58309d 1847 err = btrfs_add_nondir(trans, dentry, inode, 0);
618e21d5
JB		 1848 if (err)
1849 drop_inode = 1;
1850 else {
1851 inode->i_op = &btrfs_special_inode_operations;
1852 init_special_inode(inode, inode->i_mode, rdev);
1b4ab1bb 1853 btrfs_update_inode(trans, root, inode);
618e21d5
JB		 1854 }
1855 dir->i_sb->s_dirt = 1;
1856 btrfs_update_inode_block_group(trans, inode);
1857 btrfs_update_inode_block_group(trans, dir);
1858out_unlock:
d3c2fdcf 1859 nr = trans->blocks_used;
618e21d5 1860 btrfs_end_transaction(trans, root);
1832a6d5 1861fail:
618e21d5
JB		 1862 mutex_unlock(&root->fs_info->fs_mutex);
1863
1864 if (drop_inode) {
1865 inode_dec_link_count(inode);
1866 iput(inode);
1867 }
d3c2fdcf 1868 btrfs_btree_balance_dirty(root, nr);
e2008b61 1869 btrfs_throttle(root);
618e21d5
JB		 1870 return err;
1871}
1872
39279cc3
CM		 1873static int btrfs_create(struct inode *dir, struct dentry *dentry,
1874 int mode, struct nameidata *nd)
1875{
1876 struct btrfs_trans_handle *trans;
1877 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1878 struct inode *inode = NULL;
39279cc3
CM		 1879 int err;
1880 int drop_inode = 0;
1832a6d5 1881 unsigned long nr = 0;
39279cc3
CM		 1882 u64 objectid;
1883
1884 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1885 err = btrfs_check_free_space(root, 1, 0);
1886 if (err)
1887 goto fail;
39279cc3
CM		 1888 trans = btrfs_start_transaction(root, 1);
1889 btrfs_set_trans_block_group(trans, dir);
1890
1891 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1892 if (err) {
1893 err = -ENOSPC;
1894 goto out_unlock;
1895 }
1896
9c58309d
CM		 1897 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1898 dentry->d_name.len,
1899 dentry->d_parent->d_inode->i_ino,
1900 objectid, BTRFS_I(dir)->block_group, mode);
39279cc3
CM		 1901 err = PTR_ERR(inode);
1902 if (IS_ERR(inode))
1903 goto out_unlock;
1904
1905 btrfs_set_trans_block_group(trans, inode);
9c58309d 1906 err = btrfs_add_nondir(trans, dentry, inode, 0);
39279cc3
CM		 1907 if (err)
1908 drop_inode = 1;
1909 else {
1910 inode->i_mapping->a_ops = &btrfs_aops;
04160088 1911 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3
CM		 1912 inode->i_fop = &btrfs_file_operations;
1913 inode->i_op = &btrfs_file_inode_operations;
d1310b2e
CM		 1914 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1915 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
a52d9a80 1916 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 1917 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1918 inode->i_mapping, GFP_NOFS);
9069218d 1919 BTRFS_I(inode)->delalloc_bytes = 0;
d1310b2e 1920 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 1921 }
1922 dir->i_sb->s_dirt = 1;
1923 btrfs_update_inode_block_group(trans, inode);
1924 btrfs_update_inode_block_group(trans, dir);
1925out_unlock:
d3c2fdcf 1926 nr = trans->blocks_used;
39279cc3 1927 btrfs_end_transaction(trans, root);
1832a6d5 1928fail:
39279cc3
CM		 1929 mutex_unlock(&root->fs_info->fs_mutex);
1930
1931 if (drop_inode) {
1932 inode_dec_link_count(inode);
1933 iput(inode);
1934 }
d3c2fdcf 1935 btrfs_btree_balance_dirty(root, nr);
e2008b61 1936 btrfs_throttle(root);
39279cc3
CM		 1937 return err;
1938}
1939
1940static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1941 struct dentry *dentry)
1942{
1943 struct btrfs_trans_handle *trans;
1944 struct btrfs_root *root = BTRFS_I(dir)->root;
1945 struct inode *inode = old_dentry->d_inode;
1832a6d5 1946 unsigned long nr = 0;
39279cc3
CM		 1947 int err;
1948 int drop_inode = 0;
1949
1950 if (inode->i_nlink == 0)
1951 return -ENOENT;
1952
6da6abae
CM		 1953#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1954 inode->i_nlink++;
1955#else
39279cc3 1956 inc_nlink(inode);
6da6abae 1957#endif
39279cc3 1958 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1959 err = btrfs_check_free_space(root, 1, 0);
1960 if (err)
1961 goto fail;
39279cc3 1962 trans = btrfs_start_transaction(root, 1);
5f39d397 1963
39279cc3
CM		 1964 btrfs_set_trans_block_group(trans, dir);
1965 atomic_inc(&inode->i_count);
9c58309d 1966 err = btrfs_add_nondir(trans, dentry, inode, 1);
5f39d397 1967
39279cc3
CM		 1968 if (err)
1969 drop_inode = 1;
5f39d397 1970
39279cc3
CM		 1971 dir->i_sb->s_dirt = 1;
1972 btrfs_update_inode_block_group(trans, dir);
54aa1f4d 1973 err = btrfs_update_inode(trans, root, inode);
5f39d397 1974
54aa1f4d
CM		 1975 if (err)
1976 drop_inode = 1;
39279cc3 1977
d3c2fdcf 1978 nr = trans->blocks_used;
39279cc3 1979 btrfs_end_transaction(trans, root);
1832a6d5 1980fail:
39279cc3
CM		 1981 mutex_unlock(&root->fs_info->fs_mutex);
1982
1983 if (drop_inode) {
1984 inode_dec_link_count(inode);
1985 iput(inode);
1986 }
d3c2fdcf 1987 btrfs_btree_balance_dirty(root, nr);
e2008b61 1988 btrfs_throttle(root);
39279cc3
CM		 1989 return err;
1990}
1991
39279cc3
CM		 1992static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1993{
1994 struct inode *inode;
1995 struct btrfs_trans_handle *trans;
1996 struct btrfs_root *root = BTRFS_I(dir)->root;
1997 int err = 0;
1998 int drop_on_err = 0;
1999 u64 objectid;
d3c2fdcf 2000 unsigned long nr = 1;
39279cc3
CM		 2001
2002 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2003 err = btrfs_check_free_space(root, 1, 0);
2004 if (err)
2005 goto out_unlock;
2006
39279cc3
CM		 2007 trans = btrfs_start_transaction(root, 1);
2008 btrfs_set_trans_block_group(trans, dir);
5f39d397 2009
39279cc3
CM		 2010 if (IS_ERR(trans)) {
2011 err = PTR_ERR(trans);
2012 goto out_unlock;
2013 }
2014
2015 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2016 if (err) {
2017 err = -ENOSPC;
2018 goto out_unlock;
2019 }
2020
9c58309d
CM		 2021 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
2022 dentry->d_name.len,
2023 dentry->d_parent->d_inode->i_ino, objectid,
39279cc3
CM		 2024 BTRFS_I(dir)->block_group, S_IFDIR | mode);
2025 if (IS_ERR(inode)) {
2026 err = PTR_ERR(inode);
2027 goto out_fail;
2028 }
5f39d397 2029
39279cc3
CM		 2030 drop_on_err = 1;
2031 inode->i_op = &btrfs_dir_inode_operations;
2032 inode->i_fop = &btrfs_dir_file_operations;
2033 btrfs_set_trans_block_group(trans, inode);
2034
3954401f 2035 inode->i_size = 0;
39279cc3
CM		 2036 err = btrfs_update_inode(trans, root, inode);
2037 if (err)
2038 goto out_fail;
5f39d397 2039
9c58309d 2040 err = btrfs_add_link(trans, dentry, inode, 0);
39279cc3
CM		 2041 if (err)
2042 goto out_fail;
5f39d397 2043
39279cc3
CM		 2044 d_instantiate(dentry, inode);
2045 drop_on_err = 0;
2046 dir->i_sb->s_dirt = 1;
2047 btrfs_update_inode_block_group(trans, inode);
2048 btrfs_update_inode_block_group(trans, dir);
2049
2050out_fail:
d3c2fdcf 2051 nr = trans->blocks_used;
39279cc3 2052 btrfs_end_transaction(trans, root);
5f39d397 2053
39279cc3
CM		 2054out_unlock:
2055 mutex_unlock(&root->fs_info->fs_mutex);
2056 if (drop_on_err)
2057 iput(inode);
d3c2fdcf 2058 btrfs_btree_balance_dirty(root, nr);
e2008b61 2059 btrfs_throttle(root);
39279cc3
CM		 2060 return err;
2061}
2062
a52d9a80 2063struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
70dec807 2064 size_t pg_offset, u64 start, u64 len,
a52d9a80
CM		 2065 int create)
2066{
2067 int ret;
2068 int err = 0;
db94535d 2069 u64 bytenr;
a52d9a80
CM		 2070 u64 extent_start = 0;
2071 u64 extent_end = 0;
2072 u64 objectid = inode->i_ino;
2073 u32 found_type;
a52d9a80
CM		 2074 struct btrfs_path *path;
2075 struct btrfs_root *root = BTRFS_I(inode)->root;
2076 struct btrfs_file_extent_item *item;
5f39d397
CM		 2077 struct extent_buffer *leaf;
2078 struct btrfs_key found_key;
a52d9a80
CM		 2079 struct extent_map *em = NULL;
2080 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
d1310b2e 2081 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
a52d9a80
CM		 2082 struct btrfs_trans_handle *trans = NULL;
2083
2084 path = btrfs_alloc_path();
2085 BUG_ON(!path);
2086 mutex_lock(&root->fs_info->fs_mutex);
2087
2088again:
d1310b2e
CM		 2089 spin_lock(&em_tree->lock);
2090 em = lookup_extent_mapping(em_tree, start, len);
2091 spin_unlock(&em_tree->lock);
2092
a52d9a80 2093 if (em) {
56b453c9 2094 if (em->start > start) {
d1310b2e
CM		 2095 printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n",
2096 start, len, em->start, em->len);
56b453c9
CM		 2097 WARN_ON(1);
2098 }
70dec807
CM		 2099 if (em->block_start == EXTENT_MAP_INLINE && page)
2100 free_extent_map(em);
2101 else
2102 goto out;
a52d9a80 2103 }
d1310b2e 2104 em = alloc_extent_map(GFP_NOFS);
a52d9a80 2105 if (!em) {
d1310b2e
CM		 2106 err = -ENOMEM;
2107 goto out;
a52d9a80 2108 }
d1310b2e
CM		 2109
2110 em->start = EXTENT_MAP_HOLE;
2111 em->len = (u64)-1;
a52d9a80 2112 em->bdev = inode->i_sb->s_bdev;
179e29e4
CM		 2113 ret = btrfs_lookup_file_extent(trans, root, path,
2114 objectid, start, trans != NULL);
a52d9a80
CM		 2115 if (ret < 0) {
2116 err = ret;
2117 goto out;
2118 }
2119
2120 if (ret != 0) {
2121 if (path->slots[0] == 0)
2122 goto not_found;
2123 path->slots[0]--;
2124 }
2125
5f39d397
CM		 2126 leaf = path->nodes[0];
2127 item = btrfs_item_ptr(leaf, path->slots[0],
a52d9a80 2128 struct btrfs_file_extent_item);
a52d9a80 2129 /* are we inside the extent that was found? */
5f39d397
CM		 2130 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2131 found_type = btrfs_key_type(&found_key);
2132 if (found_key.objectid != objectid ||
a52d9a80
CM		 2133 found_type != BTRFS_EXTENT_DATA_KEY) {
2134 goto not_found;
2135 }
2136
5f39d397
CM		 2137 found_type = btrfs_file_extent_type(leaf, item);
2138 extent_start = found_key.offset;
a52d9a80
CM		 2139 if (found_type == BTRFS_FILE_EXTENT_REG) {
2140 extent_end = extent_start +
db94535d 2141 btrfs_file_extent_num_bytes(leaf, item);
a52d9a80 2142 err = 0;
b888db2b 2143 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 2144 em->start = start;
2145 if (start < extent_start) {
d1310b2e 2146 if (start + len <= extent_start)
b888db2b 2147 goto not_found;
d1310b2e 2148 em->len = extent_end - extent_start;
a52d9a80 2149 } else {
d1310b2e 2150 em->len = len;
a52d9a80
CM		 2151 }
2152 goto not_found_em;
2153 }
db94535d
CM		 2154 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
2155 if (bytenr == 0) {
a52d9a80 2156 em->start = extent_start;
d1310b2e 2157 em->len = extent_end - extent_start;
5f39d397 2158 em->block_start = EXTENT_MAP_HOLE;
a52d9a80
CM		 2159 goto insert;
2160 }
db94535d
CM		 2161 bytenr += btrfs_file_extent_offset(leaf, item);
2162 em->block_start = bytenr;
a52d9a80 2163 em->start = extent_start;
d1310b2e 2164 em->len = extent_end - extent_start;
a52d9a80
CM		 2165 goto insert;
2166 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
70dec807 2167 u64 page_start;
5f39d397 2168 unsigned long ptr;
a52d9a80 2169 char *map;
3326d1b0
CM		 2170 size_t size;
2171 size_t extent_offset;
2172 size_t copy_size;
a52d9a80 2173
5f39d397
CM		 2174 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
2175 path->slots[0]));
d1310b2e
CM		 2176 extent_end = (extent_start + size + root->sectorsize - 1) &
2177 ~((u64)root->sectorsize - 1);
b888db2b 2178 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 2179 em->start = start;
2180 if (start < extent_start) {
d1310b2e 2181 if (start + len <= extent_start)
b888db2b 2182 goto not_found;
d1310b2e 2183 em->len = extent_end - extent_start;
a52d9a80 2184 } else {
d1310b2e 2185 em->len = len;
a52d9a80
CM		 2186 }
2187 goto not_found_em;
2188 }
689f9346 2189 em->block_start = EXTENT_MAP_INLINE;
689f9346
Y		 2190
2191 if (!page) {
2192 em->start = extent_start;
d1310b2e 2193 em->len = size;
689f9346
Y		 2194 goto out;
2195 }
5f39d397 2196
70dec807
CM		 2197 page_start = page_offset(page) + pg_offset;
2198 extent_offset = page_start - extent_start;
2199 copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
3326d1b0 2200 size - extent_offset);
3326d1b0 2201 em->start = extent_start + extent_offset;
70dec807
CM		 2202 em->len = (copy_size + root->sectorsize - 1) &
2203 ~((u64)root->sectorsize - 1);
689f9346
Y		 2204 map = kmap(page);
2205 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
179e29e4 2206 if (create == 0 && !PageUptodate(page)) {
70dec807 2207 read_extent_buffer(leaf, map + pg_offset, ptr,
179e29e4
CM		 2208 copy_size);
2209 flush_dcache_page(page);
2210 } else if (create && PageUptodate(page)) {
2211 if (!trans) {
2212 kunmap(page);
2213 free_extent_map(em);
2214 em = NULL;
2215 btrfs_release_path(root, path);
2216 trans = btrfs_start_transaction(root, 1);
2217 goto again;
2218 }
70dec807 2219 write_extent_buffer(leaf, map + pg_offset, ptr,
179e29e4
CM		 2220 copy_size);
2221 btrfs_mark_buffer_dirty(leaf);
a52d9a80 2222 }
a52d9a80 2223 kunmap(page);
d1310b2e
CM		 2224 set_extent_uptodate(io_tree, em->start,
2225 extent_map_end(em) - 1, GFP_NOFS);
a52d9a80
CM		 2226 goto insert;
2227 } else {
2228 printk("unkknown found_type %d\n", found_type);
2229 WARN_ON(1);
2230 }
2231not_found:
2232 em->start = start;
d1310b2e 2233 em->len = len;
a52d9a80 2234not_found_em:
5f39d397 2235 em->block_start = EXTENT_MAP_HOLE;
a52d9a80
CM		 2236insert:
2237 btrfs_release_path(root, path);
d1310b2e
CM		 2238 if (em->start > start || extent_map_end(em) <= start) {
2239 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len);
a52d9a80
CM		 2240 err = -EIO;
2241 goto out;
2242 }
d1310b2e
CM		 2243
2244 err = 0;
2245 spin_lock(&em_tree->lock);
a52d9a80
CM		 2246 ret = add_extent_mapping(em_tree, em);
2247 if (ret == -EEXIST) {
2248 free_extent_map(em);
d1310b2e
CM		 2249 em = lookup_extent_mapping(em_tree, start, len);
2250 if (!em) {
a52d9a80 2251 err = -EIO;
d1310b2e 2252 printk("failing to insert %Lu %Lu\n", start, len);
a52d9a80 2253 }
a52d9a80 2254 }
d1310b2e 2255 spin_unlock(&em_tree->lock);
a52d9a80
CM		 2256out:
2257 btrfs_free_path(path);
2258 if (trans) {
2259 ret = btrfs_end_transaction(trans, root);
2260 if (!err)
2261 err = ret;
2262 }
2263 mutex_unlock(&root->fs_info->fs_mutex);
2264 if (err) {
2265 free_extent_map(em);
2266 WARN_ON(1);
2267 return ERR_PTR(err);
2268 }
2269 return em;
2270}
2271
16432985
CM		 2272static int btrfs_get_block(struct inode *inode, sector_t iblock,
2273 struct buffer_head *bh_result, int create)
2274{
2275 struct extent_map *em;
2276 u64 start = (u64)iblock << inode->i_blkbits;
2277 struct btrfs_multi_bio *multi = NULL;
2278 struct btrfs_root *root = BTRFS_I(inode)->root;
2279 u64 len;
2280 u64 logical;
2281 u64 map_length;
2282 int ret = 0;
2283
2284 em = btrfs_get_extent(inode, NULL, 0, start, bh_result->b_size, 0);
2285
2286 if (!em || IS_ERR(em))
2287 goto out;
2288
2289 if (em->start > start || em->start + em->len <= start)
2290 goto out;
2291
2292 if (em->block_start == EXTENT_MAP_INLINE) {
2293 ret = -EINVAL;
2294 goto out;
2295 }
2296
2297 if (em->block_start == EXTENT_MAP_HOLE ||
2298 em->block_start == EXTENT_MAP_DELALLOC) {
2299 goto out;
2300 }
2301
2302 len = em->start + em->len - start;
2303 len = min_t(u64, len, INT_LIMIT(typeof(bh_result->b_size)));
2304
2305 logical = start - em->start;
2306 logical = em->block_start + logical;
2307
2308 map_length = len;
2309 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
2310 logical, &map_length, &multi, 0);
2311 BUG_ON(ret);
2312 bh_result->b_blocknr = multi->stripes[0].physical >> inode->i_blkbits;
2313 bh_result->b_size = min(map_length, len);
2314 bh_result->b_bdev = multi->stripes[0].dev->bdev;
2315 set_buffer_mapped(bh_result);
2316 kfree(multi);
2317out:
2318 free_extent_map(em);
2319 return ret;
2320}
2321
2322static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
2323 const struct iovec *iov, loff_t offset,
2324 unsigned long nr_segs)
2325{
2326 struct file *file = iocb->ki_filp;
2327 struct inode *inode = file->f_mapping->host;
2328
2329 if (rw == WRITE)
2330 return -EINVAL;
2331
2332 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
2333 offset, nr_segs, btrfs_get_block, NULL);
2334}
2335
d396c6f5 2336static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
39279cc3 2337{
d396c6f5 2338 return extent_bmap(mapping, iblock, btrfs_get_extent);
39279cc3
CM		 2339}
2340
a52d9a80 2341int btrfs_readpage(struct file *file, struct page *page)
9ebefb18 2342{
d1310b2e
CM		 2343 struct extent_io_tree *tree;
2344 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80 2345 return extent_read_full_page(tree, page, btrfs_get_extent);
9ebefb18 2346}
1832a6d5 2347
a52d9a80 2348static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
39279cc3 2349{
d1310b2e 2350 struct extent_io_tree *tree;
b888db2b
CM		 2351
2352
2353 if (current->flags & PF_MEMALLOC) {
2354 redirty_page_for_writepage(wbc, page);
2355 unlock_page(page);
2356 return 0;
2357 }
d1310b2e 2358 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80 2359 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
9ebefb18
CM		 2360}
2361
b293f02e
CM		 2362static int btrfs_writepages(struct address_space *mapping,
2363 struct writeback_control *wbc)
2364{
d1310b2e
CM		 2365 struct extent_io_tree *tree;
2366 tree = &BTRFS_I(mapping->host)->io_tree;
b293f02e
CM		 2367 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2368}
2369
3ab2fb5a
CM		 2370static int
2371btrfs_readpages(struct file *file, struct address_space *mapping,
2372 struct list_head *pages, unsigned nr_pages)
2373{
d1310b2e
CM		 2374 struct extent_io_tree *tree;
2375 tree = &BTRFS_I(mapping->host)->io_tree;
3ab2fb5a
CM		 2376 return extent_readpages(tree, mapping, pages, nr_pages,
2377 btrfs_get_extent);
2378}
2379
70dec807 2380static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
9ebefb18 2381{
d1310b2e
CM		 2382 struct extent_io_tree *tree;
2383 struct extent_map_tree *map;
a52d9a80 2384 int ret;
8c2383c3 2385
d1310b2e
CM		 2386 tree = &BTRFS_I(page->mapping->host)->io_tree;
2387 map = &BTRFS_I(page->mapping->host)->extent_tree;
70dec807 2388 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
a52d9a80
CM		 2389 if (ret == 1) {
2390 ClearPagePrivate(page);
2391 set_page_private(page, 0);
2392 page_cache_release(page);
39279cc3 2393 }
a52d9a80 2394 return ret;
39279cc3
CM		 2395}
2396
a52d9a80 2397static void btrfs_invalidatepage(struct page *page, unsigned long offset)
39279cc3 2398{
d1310b2e 2399 struct extent_io_tree *tree;
39279cc3 2400
d1310b2e 2401 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80
CM		 2402 extent_invalidatepage(tree, page, offset);
2403 btrfs_releasepage(page, GFP_NOFS);
39279cc3
CM		 2404}
2405
9ebefb18
CM		 2406/*
2407 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2408 * called from a page fault handler when a page is first dirtied. Hence we must
2409 * be careful to check for EOF conditions here. We set the page up correctly
2410 * for a written page which means we get ENOSPC checking when writing into
2411 * holes and correct delalloc and unwritten extent mapping on filesystems that
2412 * support these features.
2413 *
2414 * We are not allowed to take the i_mutex here so we have to play games to
2415 * protect against truncate races as the page could now be beyond EOF. Because
2416 * vmtruncate() writes the inode size before removing pages, once we have the
2417 * page lock we can determine safely if the page is beyond EOF. If it is not
2418 * beyond EOF, then the page is guaranteed safe against truncation until we
2419 * unlock the page.
2420 */
2421int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2422{
6da6abae 2423 struct inode *inode = fdentry(vma->vm_file)->d_inode;
1832a6d5 2424 struct btrfs_root *root = BTRFS_I(inode)->root;
9ebefb18
CM		 2425 unsigned long end;
2426 loff_t size;
1832a6d5 2427 int ret;
a52d9a80 2428 u64 page_start;
9ebefb18 2429
1832a6d5
CM		 2430 mutex_lock(&root->fs_info->fs_mutex);
2431 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
8f662a76 2432 mutex_unlock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2433 if (ret)
2434 goto out;
2435
2436 ret = -EINVAL;
2437
9ebefb18
CM		 2438 lock_page(page);
2439 wait_on_page_writeback(page);
9ebefb18 2440 size = i_size_read(inode);
35ebb934 2441 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 2442
9ebefb18 2443 if ((page->mapping != inode->i_mapping) ||
a52d9a80 2444 (page_start > size)) {
9ebefb18
CM		 2445 /* page got truncated out from underneath us */
2446 goto out_unlock;
2447 }
2448
2449 /* page is wholly or partially inside EOF */
a52d9a80 2450 if (page_start + PAGE_CACHE_SIZE > size)
9ebefb18
CM		 2451 end = size & ~PAGE_CACHE_MASK;
2452 else
2453 end = PAGE_CACHE_SIZE;
2454
b888db2b 2455 ret = btrfs_cow_one_page(inode, page, end);
9ebefb18
CM		 2456
2457out_unlock:
2458 unlock_page(page);
1832a6d5 2459out:
9ebefb18
CM		 2460 return ret;
2461}
2462
39279cc3
CM		 2463static void btrfs_truncate(struct inode *inode)
2464{
2465 struct btrfs_root *root = BTRFS_I(inode)->root;
2466 int ret;
2467 struct btrfs_trans_handle *trans;
d3c2fdcf 2468 unsigned long nr;
39279cc3
CM		 2469
2470 if (!S_ISREG(inode->i_mode))
2471 return;
2472 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2473 return;
2474
2475 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2476
2477 mutex_lock(&root->fs_info->fs_mutex);
2478 trans = btrfs_start_transaction(root, 1);
2479 btrfs_set_trans_block_group(trans, inode);
2480
2481 /* FIXME, add redo link to tree so we don't leak on crash */
85e21bac
CM		 2482 ret = btrfs_truncate_in_trans(trans, root, inode,
2483 BTRFS_EXTENT_DATA_KEY);
39279cc3 2484 btrfs_update_inode(trans, root, inode);
d3c2fdcf 2485 nr = trans->blocks_used;
5f39d397 2486
39279cc3
CM		 2487 ret = btrfs_end_transaction(trans, root);
2488 BUG_ON(ret);
2489 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2490 btrfs_btree_balance_dirty(root, nr);
e2008b61 2491 btrfs_throttle(root);
39279cc3
CM		 2492}
2493
4313b399
CM		 2494static int noinline create_subvol(struct btrfs_root *root, char *name,
2495 int namelen)
39279cc3
CM		 2496{
2497 struct btrfs_trans_handle *trans;
2498 struct btrfs_key key;
2499 struct btrfs_root_item root_item;
2500 struct btrfs_inode_item *inode_item;
5f39d397 2501 struct extent_buffer *leaf;
dc17ff8f 2502 struct btrfs_root *new_root = root;
39279cc3
CM		 2503 struct inode *inode;
2504 struct inode *dir;
2505 int ret;
54aa1f4d 2506 int err;
39279cc3
CM		 2507 u64 objectid;
2508 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
d3c2fdcf 2509 unsigned long nr = 1;
39279cc3
CM		 2510
2511 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2512 ret = btrfs_check_free_space(root, 1, 0);
2513 if (ret)
2514 goto fail_commit;
2515
39279cc3
CM		 2516 trans = btrfs_start_transaction(root, 1);
2517 BUG_ON(!trans);
2518
7bb86316
CM		 2519 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2520 0, &objectid);
2521 if (ret)
2522 goto fail;
2523
2524 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2525 objectid, trans->transid, 0, 0,
2526 0, 0);
5f39d397
CM		 2527 if (IS_ERR(leaf))
2528 return PTR_ERR(leaf);
2529
2530 btrfs_set_header_nritems(leaf, 0);
2531 btrfs_set_header_level(leaf, 0);
db94535d 2532 btrfs_set_header_bytenr(leaf, leaf->start);
5f39d397 2533 btrfs_set_header_generation(leaf, trans->transid);
7bb86316
CM		 2534 btrfs_set_header_owner(leaf, objectid);
2535
5f39d397
CM		 2536 write_extent_buffer(leaf, root->fs_info->fsid,
2537 (unsigned long)btrfs_header_fsid(leaf),
2538 BTRFS_FSID_SIZE);
2539 btrfs_mark_buffer_dirty(leaf);
39279cc3
CM		 2540
2541 inode_item = &root_item.inode;
2542 memset(inode_item, 0, sizeof(*inode_item));
5f39d397
CM		 2543 inode_item->generation = cpu_to_le64(1);
2544 inode_item->size = cpu_to_le64(3);
2545 inode_item->nlink = cpu_to_le32(1);
2546 inode_item->nblocks = cpu_to_le64(1);
2547 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
39279cc3 2548
db94535d
CM		 2549 btrfs_set_root_bytenr(&root_item, leaf->start);
2550 btrfs_set_root_level(&root_item, 0);
39279cc3 2551 btrfs_set_root_refs(&root_item, 1);
5f39d397
CM		 2552 btrfs_set_root_used(&root_item, 0);
2553
5eda7b5e
CM		 2554 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2555 root_item.drop_level = 0;
5f39d397
CM		 2556
2557 free_extent_buffer(leaf);
2558 leaf = NULL;
39279cc3 2559
39279cc3
CM		 2560 btrfs_set_root_dirid(&root_item, new_dirid);
2561
2562 key.objectid = objectid;
2563 key.offset = 1;
39279cc3
CM		 2564 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2565 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2566 &root_item);
54aa1f4d
CM		 2567 if (ret)
2568 goto fail;
39279cc3
CM		 2569
2570 /*
2571 * insert the directory item
2572 */
2573 key.offset = (u64)-1;
2574 dir = root->fs_info->sb->s_root->d_inode;
2575 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2576 name, namelen, dir->i_ino, &key,
2577 BTRFS_FT_DIR);
54aa1f4d
CM		 2578 if (ret)
2579 goto fail;
39279cc3 2580
3954401f
CM		 2581 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2582 name, namelen, objectid,
2583 root->fs_info->sb->s_root->d_inode->i_ino);
2584 if (ret)
2585 goto fail;
2586
39279cc3 2587 ret = btrfs_commit_transaction(trans, root);
54aa1f4d
CM		 2588 if (ret)
2589 goto fail_commit;
39279cc3 2590
58176a96 2591 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
39279cc3
CM		 2592 BUG_ON(!new_root);
2593
2594 trans = btrfs_start_transaction(new_root, 1);
2595 BUG_ON(!trans);
2596
9c58309d
CM		 2597 inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid,
2598 new_dirid,
39279cc3 2599 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
54aa1f4d
CM		 2600 if (IS_ERR(inode))
2601 goto fail;
39279cc3
CM		 2602 inode->i_op = &btrfs_dir_inode_operations;
2603 inode->i_fop = &btrfs_dir_file_operations;
34088780 2604 new_root->inode = inode;
39279cc3 2605
3954401f
CM		 2606 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2607 new_dirid);
39279cc3 2608 inode->i_nlink = 1;
3954401f 2609 inode->i_size = 0;
39279cc3 2610 ret = btrfs_update_inode(trans, new_root, inode);
54aa1f4d
CM		 2611 if (ret)
2612 goto fail;
2613fail:
d3c2fdcf 2614 nr = trans->blocks_used;
dc17ff8f 2615 err = btrfs_commit_transaction(trans, new_root);
54aa1f4d
CM		 2616 if (err && !ret)
2617 ret = err;
2618fail_commit:
39279cc3 2619 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2620 btrfs_btree_balance_dirty(root, nr);
e2008b61 2621 btrfs_throttle(root);
54aa1f4d 2622 return ret;
39279cc3
CM		 2623}
2624
2625static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2626{
3063d29f 2627 struct btrfs_pending_snapshot *pending_snapshot;
39279cc3 2628 struct btrfs_trans_handle *trans;
39279cc3 2629 int ret;
54aa1f4d 2630 int err;
1832a6d5 2631 unsigned long nr = 0;
39279cc3
CM		 2632
2633 if (!root->ref_cows)
2634 return -EINVAL;
2635
2636 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2637 ret = btrfs_check_free_space(root, 1, 0);
2638 if (ret)
2639 goto fail_unlock;
2640
3063d29f
CM		 2641 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
2642 if (!pending_snapshot) {
2643 ret = -ENOMEM;
2644 goto fail_unlock;
2645 }
fb4bc1e0 2646 pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
3063d29f
CM		 2647 if (!pending_snapshot->name) {
2648 ret = -ENOMEM;
2649 kfree(pending_snapshot);
2650 goto fail_unlock;
2651 }
fb4bc1e0
Y		 2652 memcpy(pending_snapshot->name, name, namelen);
2653 pending_snapshot->name[namelen] = '\0';
39279cc3
CM		 2654 trans = btrfs_start_transaction(root, 1);
2655 BUG_ON(!trans);
3063d29f
CM		 2656 pending_snapshot->root = root;
2657 list_add(&pending_snapshot->list,
2658 &trans->transaction->pending_snapshots);
39279cc3 2659 ret = btrfs_update_inode(trans, root, root->inode);
54aa1f4d 2660 err = btrfs_commit_transaction(trans, root);
5f39d397 2661
1832a6d5 2662fail_unlock:
39279cc3 2663 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2664 btrfs_btree_balance_dirty(root, nr);
e2008b61 2665 btrfs_throttle(root);
54aa1f4d 2666 return ret;
39279cc3
CM		 2667}
2668
edbd8d4e 2669unsigned long btrfs_force_ra(struct address_space *mapping,
86479a04
CM		 2670 struct file_ra_state *ra, struct file *file,
2671 pgoff_t offset, pgoff_t last_index)
2672{
2673 pgoff_t req_size;
2674
2675#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2676 req_size = last_index - offset + 1;
2677 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2678 return offset;
2679#else
2680 req_size = min(last_index - offset + 1, (pgoff_t)128);
2681 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2682 return offset + req_size;
2683#endif
2684}
2685
2686int btrfs_defrag_file(struct file *file) {
6da6abae 2687 struct inode *inode = fdentry(file)->d_inode;
1832a6d5 2688 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 2689 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
86479a04
CM		 2690 struct page *page;
2691 unsigned long last_index;
2692 unsigned long ra_index = 0;
2693 u64 page_start;
2694 u64 page_end;
2695 unsigned long i;
1832a6d5
CM		 2696 int ret;
2697
2698 mutex_lock(&root->fs_info->fs_mutex);
2699 ret = btrfs_check_free_space(root, inode->i_size, 0);
2700 mutex_unlock(&root->fs_info->fs_mutex);
2701 if (ret)
2702 return -ENOSPC;
86479a04
CM		 2703
2704 mutex_lock(&inode->i_mutex);
2705 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2706 for (i = 0; i <= last_index; i++) {
2707 if (i == ra_index) {
edbd8d4e
CM		 2708 ra_index = btrfs_force_ra(inode->i_mapping,
2709 &file->f_ra,
2710 file, ra_index, last_index);
86479a04
CM		 2711 }
2712 page = grab_cache_page(inode->i_mapping, i);
2713 if (!page)
2714 goto out_unlock;
2715 if (!PageUptodate(page)) {
2716 btrfs_readpage(NULL, page);
2717 lock_page(page);
2718 if (!PageUptodate(page)) {
2719 unlock_page(page);
2720 page_cache_release(page);
2721 goto out_unlock;
2722 }
2723 }
35ebb934 2724 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
86479a04
CM		 2725 page_end = page_start + PAGE_CACHE_SIZE - 1;
2726
d1310b2e 2727 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
d1310b2e 2728 set_extent_delalloc(io_tree, page_start,
86479a04 2729 page_end, GFP_NOFS);
edbd8d4e 2730
d1310b2e 2731 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
86479a04
CM		 2732 set_page_dirty(page);
2733 unlock_page(page);
2734 page_cache_release(page);
2735 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2736 }
2737
2738out_unlock:
2739 mutex_unlock(&inode->i_mutex);
2740 return 0;
2741}
2742
edbd8d4e
CM		 2743static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2744{
2745 u64 new_size;
2746 u64 old_size;
2747 struct btrfs_ioctl_vol_args *vol_args;
2748 struct btrfs_trans_handle *trans;
2749 char *sizestr;
2750 int ret = 0;
2751 int namelen;
2752 int mod = 0;
2753
2754 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2755
2756 if (!vol_args)
2757 return -ENOMEM;
2758
2759 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2760 ret = -EFAULT;
2761 goto out;
2762 }
2763 namelen = strlen(vol_args->name);
2764 if (namelen > BTRFS_VOL_NAME_MAX) {
2765 ret = -EINVAL;
2766 goto out;
2767 }
2768
2769 sizestr = vol_args->name;
2770 if (!strcmp(sizestr, "max"))
2771 new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
2772 else {
2773 if (sizestr[0] == '-') {
2774 mod = -1;
2775 sizestr++;
2776 } else if (sizestr[0] == '+') {
2777 mod = 1;
2778 sizestr++;
2779 }
2780 new_size = btrfs_parse_size(sizestr);
2781 if (new_size == 0) {
2782 ret = -EINVAL;
2783 goto out;
2784 }
2785 }
2786
2787 mutex_lock(&root->fs_info->fs_mutex);
2788 old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);
2789
2790 if (mod < 0) {
2791 if (new_size > old_size) {
2792 ret = -EINVAL;
2793 goto out_unlock;
2794 }
2795 new_size = old_size - new_size;
2796 } else if (mod > 0) {
2797 new_size = old_size + new_size;
2798 }
2799
2800 if (new_size < 256 * 1024 * 1024) {
2801 ret = -EINVAL;
2802 goto out_unlock;
2803 }
2804 if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
2805 ret = -EFBIG;
2806 goto out_unlock;
2807 }
f9ef6604
CM		 2808
2809 do_div(new_size, root->sectorsize);
2810 new_size *= root->sectorsize;
edbd8d4e
CM		 2811
2812printk("new size is %Lu\n", new_size);
2813 if (new_size > old_size) {
2814 trans = btrfs_start_transaction(root, 1);
2815 ret = btrfs_grow_extent_tree(trans, root, new_size);
2816 btrfs_commit_transaction(trans, root);
2817 } else {
2818 ret = btrfs_shrink_extent_tree(root, new_size);
2819 }
2820
2821out_unlock:
2822 mutex_unlock(&root->fs_info->fs_mutex);
2823out:
2824 kfree(vol_args);
2825 return ret;
2826}
2827
4313b399
CM		 2828static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
2829 void __user *arg)
39279cc3 2830{
4aec2b52 2831 struct btrfs_ioctl_vol_args *vol_args;
39279cc3 2832 struct btrfs_dir_item *di;
39279cc3
CM		 2833 struct btrfs_path *path;
2834 u64 root_dirid;
4aec2b52
CM		 2835 int namelen;
2836 int ret;
39279cc3 2837
4aec2b52 2838 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
5f39d397 2839
4aec2b52
CM		 2840 if (!vol_args)
2841 return -ENOMEM;
2842
2843 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2844 ret = -EFAULT;
2845 goto out;
2846 }
2847
2848 namelen = strlen(vol_args->name);
2849 if (namelen > BTRFS_VOL_NAME_MAX) {
2850 ret = -EINVAL;
2851 goto out;
2852 }
2853 if (strchr(vol_args->name, '/')) {
2854 ret = -EINVAL;
2855 goto out;
2856 }
d03581f4
CH		 2857
2858 path = btrfs_alloc_path();
4aec2b52
CM		 2859 if (!path) {
2860 ret = -ENOMEM;
2861 goto out;
2862 }
d03581f4
CH		 2863
2864 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2865 mutex_lock(&root->fs_info->fs_mutex);
2866 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2867 path, root_dirid,
4aec2b52 2868 vol_args->name, namelen, 0);
d03581f4
CH		 2869 mutex_unlock(&root->fs_info->fs_mutex);
2870 btrfs_free_path(path);
4aec2b52
CM		 2871
2872 if (di && !IS_ERR(di)) {
2873 ret = -EEXIST;
2874 goto out;
2875 }
2876
2877 if (IS_ERR(di)) {
2878 ret = PTR_ERR(di);
2879 goto out;
2880 }
d03581f4
CH		 2881
2882 if (root == root->fs_info->tree_root)
4aec2b52
CM		 2883 ret = create_subvol(root, vol_args->name, namelen);
2884 else
2885 ret = create_snapshot(root, vol_args->name, namelen);
2886out:
2887 kfree(vol_args);
2888 return ret;
d03581f4
CH		 2889}
2890
2891static int btrfs_ioctl_defrag(struct file *file)
2892{
6da6abae 2893 struct inode *inode = fdentry(file)->d_inode;
d03581f4
CH		 2894 struct btrfs_root *root = BTRFS_I(inode)->root;
2895
2896 switch (inode->i_mode & S_IFMT) {
2897 case S_IFDIR:
39279cc3 2898 mutex_lock(&root->fs_info->fs_mutex);
d03581f4
CH		 2899 btrfs_defrag_root(root, 0);
2900 btrfs_defrag_root(root->fs_info->extent_root, 0);
39279cc3 2901 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3 2902 break;
d03581f4
CH		 2903 case S_IFREG:
2904 btrfs_defrag_file(file);
2905 break;
2906 }
2907
2908 return 0;
2909}
6702ed49 2910
d03581f4
CH		 2911long btrfs_ioctl(struct file *file, unsigned int
2912 cmd, unsigned long arg)
2913{
6da6abae 2914 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
d03581f4
CH		 2915
2916 switch (cmd) {
2917 case BTRFS_IOC_SNAP_CREATE:
2918 return btrfs_ioctl_snap_create(root, (void __user *)arg);
6702ed49 2919 case BTRFS_IOC_DEFRAG:
d03581f4 2920 return btrfs_ioctl_defrag(file);
edbd8d4e
CM		 2921 case BTRFS_IOC_RESIZE:
2922 return btrfs_ioctl_resize(root, (void __user *)arg);
39279cc3 2923 }
d03581f4
CH		 2924
2925 return -ENOTTY;
39279cc3
CM		 2926}
2927
39279cc3
CM		 2928/*
2929 * Called inside transaction, so use GFP_NOFS
2930 */
2931struct inode *btrfs_alloc_inode(struct super_block *sb)
2932{
2933 struct btrfs_inode *ei;
2934
2935 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2936 if (!ei)
2937 return NULL;
15ee9bc7 2938 ei->last_trans = 0;
dc17ff8f 2939 ei->ordered_trans = 0;
39279cc3
CM		 2940 return &ei->vfs_inode;
2941}
2942
2943void btrfs_destroy_inode(struct inode *inode)
2944{
2945 WARN_ON(!list_empty(&inode->i_dentry));
2946 WARN_ON(inode->i_data.nrpages);
2947
8c416c9e 2948 btrfs_drop_extent_cache(inode, 0, (u64)-1);
39279cc3
CM		 2949 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2950}
2951
44ec0b71
CM		 2952#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2953static void init_once(struct kmem_cache * cachep, void *foo)
2954#else
39279cc3
CM		 2955static void init_once(void * foo, struct kmem_cache * cachep,
2956 unsigned long flags)
44ec0b71 2957#endif
39279cc3
CM		 2958{
2959 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2960
2961 inode_init_once(&ei->vfs_inode);
2962}
2963
2964void btrfs_destroy_cachep(void)
2965{
2966 if (btrfs_inode_cachep)
2967 kmem_cache_destroy(btrfs_inode_cachep);
2968 if (btrfs_trans_handle_cachep)
2969 kmem_cache_destroy(btrfs_trans_handle_cachep);
2970 if (btrfs_transaction_cachep)
2971 kmem_cache_destroy(btrfs_transaction_cachep);
2972 if (btrfs_bit_radix_cachep)
2973 kmem_cache_destroy(btrfs_bit_radix_cachep);
2974 if (btrfs_path_cachep)
2975 kmem_cache_destroy(btrfs_path_cachep);
2976}
2977
86479a04 2978struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
92fee66d 2979 unsigned long extra_flags,
44ec0b71
CM		 2980#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2981 void (*ctor)(struct kmem_cache *, void *)
2982#else
92fee66d 2983 void (*ctor)(void *, struct kmem_cache *,
44ec0b71
CM		 2984 unsigned long)
2985#endif
2986 )
92fee66d
CM		 2987{
2988 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2989 SLAB_MEM_SPREAD | extra_flags), ctor
2990#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2991 ,NULL
2992#endif
2993 );
2994}
2995
39279cc3
CM		 2996int btrfs_init_cachep(void)
2997{
86479a04 2998 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
92fee66d
CM		 2999 sizeof(struct btrfs_inode),
3000 0, init_once);
39279cc3
CM		 3001 if (!btrfs_inode_cachep)
3002 goto fail;
86479a04
CM		 3003 btrfs_trans_handle_cachep =
3004 btrfs_cache_create("btrfs_trans_handle_cache",
3005 sizeof(struct btrfs_trans_handle),
3006 0, NULL);
39279cc3
CM		 3007 if (!btrfs_trans_handle_cachep)
3008 goto fail;
86479a04 3009 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
39279cc3 3010 sizeof(struct btrfs_transaction),
92fee66d 3011 0, NULL);
39279cc3
CM		 3012 if (!btrfs_transaction_cachep)
3013 goto fail;
86479a04 3014 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
23223584 3015 sizeof(struct btrfs_path),
92fee66d 3016 0, NULL);
39279cc3
CM		 3017 if (!btrfs_path_cachep)
3018 goto fail;
86479a04 3019 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
92fee66d 3020 SLAB_DESTROY_BY_RCU, NULL);
39279cc3
CM		 3021 if (!btrfs_bit_radix_cachep)
3022 goto fail;
3023 return 0;
3024fail:
3025 btrfs_destroy_cachep();
3026 return -ENOMEM;
3027}
3028
3029static int btrfs_getattr(struct vfsmount *mnt,
3030 struct dentry *dentry, struct kstat *stat)
3031{
3032 struct inode *inode = dentry->d_inode;
3033 generic_fillattr(inode, stat);
d6667462 3034 stat->blksize = PAGE_CACHE_SIZE;
9069218d 3035 stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9);
39279cc3
CM		 3036 return 0;
3037}
3038
3039static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
3040 struct inode * new_dir,struct dentry *new_dentry)
3041{
3042 struct btrfs_trans_handle *trans;
3043 struct btrfs_root *root = BTRFS_I(old_dir)->root;
3044 struct inode *new_inode = new_dentry->d_inode;
3045 struct inode *old_inode = old_dentry->d_inode;
3046 struct timespec ctime = CURRENT_TIME;
3047 struct btrfs_path *path;
39279cc3
CM		 3048 int ret;
3049
3050 if (S_ISDIR(old_inode->i_mode) && new_inode &&
3051 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
3052 return -ENOTEMPTY;
3053 }
5f39d397 3054
39279cc3 3055 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 3056 ret = btrfs_check_free_space(root, 1, 0);
3057 if (ret)
3058 goto out_unlock;
3059
39279cc3 3060 trans = btrfs_start_transaction(root, 1);
5f39d397 3061
39279cc3
CM		 3062 btrfs_set_trans_block_group(trans, new_dir);
3063 path = btrfs_alloc_path();
3064 if (!path) {
3065 ret = -ENOMEM;
3066 goto out_fail;
3067 }
3068
3069 old_dentry->d_inode->i_nlink++;
3070 old_dir->i_ctime = old_dir->i_mtime = ctime;
3071 new_dir->i_ctime = new_dir->i_mtime = ctime;
3072 old_inode->i_ctime = ctime;
5f39d397 3073
39279cc3
CM		 3074 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
3075 if (ret)
3076 goto out_fail;
3077
3078 if (new_inode) {
3079 new_inode->i_ctime = CURRENT_TIME;
3080 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
3081 if (ret)
3082 goto out_fail;
39279cc3 3083 }
9c58309d 3084 ret = btrfs_add_link(trans, new_dentry, old_inode, 1);
39279cc3
CM		 3085 if (ret)
3086 goto out_fail;
3087
3088out_fail:
3089 btrfs_free_path(path);
3090 btrfs_end_transaction(trans, root);
1832a6d5 3091out_unlock:
39279cc3
CM		 3092 mutex_unlock(&root->fs_info->fs_mutex);
3093 return ret;
3094}
3095
3096static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
3097 const char *symname)
3098{
3099 struct btrfs_trans_handle *trans;
3100 struct btrfs_root *root = BTRFS_I(dir)->root;
3101 struct btrfs_path *path;
3102 struct btrfs_key key;
1832a6d5 3103 struct inode *inode = NULL;
39279cc3
CM		 3104 int err;
3105 int drop_inode = 0;
3106 u64 objectid;
3107 int name_len;
3108 int datasize;
5f39d397 3109 unsigned long ptr;
39279cc3 3110 struct btrfs_file_extent_item *ei;
5f39d397 3111 struct extent_buffer *leaf;
1832a6d5 3112 unsigned long nr = 0;
39279cc3
CM		 3113
3114 name_len = strlen(symname) + 1;
3115 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
3116 return -ENAMETOOLONG;
1832a6d5 3117
39279cc3 3118 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 3119 err = btrfs_check_free_space(root, 1, 0);
3120 if (err)
3121 goto out_fail;
3122
39279cc3
CM		 3123 trans = btrfs_start_transaction(root, 1);
3124 btrfs_set_trans_block_group(trans, dir);
3125
3126 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
3127 if (err) {
3128 err = -ENOSPC;
3129 goto out_unlock;
3130 }
3131
9c58309d
CM		 3132 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
3133 dentry->d_name.len,
3134 dentry->d_parent->d_inode->i_ino, objectid,
39279cc3
CM		 3135 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
3136 err = PTR_ERR(inode);
3137 if (IS_ERR(inode))
3138 goto out_unlock;
3139
3140 btrfs_set_trans_block_group(trans, inode);
9c58309d 3141 err = btrfs_add_nondir(trans, dentry, inode, 0);
39279cc3
CM		 3142 if (err)
3143 drop_inode = 1;
3144 else {
3145 inode->i_mapping->a_ops = &btrfs_aops;
04160088 3146 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3
CM		 3147 inode->i_fop = &btrfs_file_operations;
3148 inode->i_op = &btrfs_file_inode_operations;
d1310b2e
CM		 3149 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
3150 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
a52d9a80 3151 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 3152 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
3153 inode->i_mapping, GFP_NOFS);
9069218d 3154 BTRFS_I(inode)->delalloc_bytes = 0;
d1310b2e 3155 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 3156 }
3157 dir->i_sb->s_dirt = 1;
3158 btrfs_update_inode_block_group(trans, inode);
3159 btrfs_update_inode_block_group(trans, dir);
3160 if (drop_inode)
3161 goto out_unlock;
3162
3163 path = btrfs_alloc_path();
3164 BUG_ON(!path);
3165 key.objectid = inode->i_ino;
3166 key.offset = 0;
39279cc3
CM		 3167 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
3168 datasize = btrfs_file_extent_calc_inline_size(name_len);
3169 err = btrfs_insert_empty_item(trans, root, path, &key,
3170 datasize);
54aa1f4d
CM		 3171 if (err) {
3172 drop_inode = 1;
3173 goto out_unlock;
3174 }
5f39d397
CM		 3175 leaf = path->nodes[0];
3176 ei = btrfs_item_ptr(leaf, path->slots[0],
3177 struct btrfs_file_extent_item);
3178 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
3179 btrfs_set_file_extent_type(leaf, ei,
39279cc3
CM		 3180 BTRFS_FILE_EXTENT_INLINE);
3181 ptr = btrfs_file_extent_inline_start(ei);
5f39d397
CM		 3182 write_extent_buffer(leaf, symname, ptr, name_len);
3183 btrfs_mark_buffer_dirty(leaf);
39279cc3 3184 btrfs_free_path(path);
5f39d397 3185
39279cc3
CM		 3186 inode->i_op = &btrfs_symlink_inode_operations;
3187 inode->i_mapping->a_ops = &btrfs_symlink_aops;
04160088 3188 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3 3189 inode->i_size = name_len - 1;
54aa1f4d
CM		 3190 err = btrfs_update_inode(trans, root, inode);
3191 if (err)
3192 drop_inode = 1;
39279cc3
CM		 3193
3194out_unlock:
d3c2fdcf 3195 nr = trans->blocks_used;
39279cc3 3196 btrfs_end_transaction(trans, root);
1832a6d5 3197out_fail:
39279cc3 3198 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 3199 if (drop_inode) {
3200 inode_dec_link_count(inode);
3201 iput(inode);
3202 }
d3c2fdcf 3203 btrfs_btree_balance_dirty(root, nr);
e2008b61 3204 btrfs_throttle(root);
39279cc3
CM		 3205 return err;
3206}
16432985 3207
fdebe2bd
Y		 3208static int btrfs_permission(struct inode *inode, int mask,
3209 struct nameidata *nd)
3210{
3211 if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
3212 return -EACCES;
3213 return generic_permission(inode, mask, NULL);
3214}
39279cc3
CM		 3215
3216static struct inode_operations btrfs_dir_inode_operations = {
3217 .lookup = btrfs_lookup,
3218 .create = btrfs_create,
3219 .unlink = btrfs_unlink,
3220 .link = btrfs_link,
3221 .mkdir = btrfs_mkdir,
3222 .rmdir = btrfs_rmdir,
3223 .rename = btrfs_rename,
3224 .symlink = btrfs_symlink,
3225 .setattr = btrfs_setattr,
618e21d5 3226 .mknod = btrfs_mknod,
5103e947
JB		 3227 .setxattr = generic_setxattr,
3228 .getxattr = generic_getxattr,
3229 .listxattr = btrfs_listxattr,
3230 .removexattr = generic_removexattr,
fdebe2bd 3231 .permission = btrfs_permission,
39279cc3 3232};
39279cc3
CM		 3233static struct inode_operations btrfs_dir_ro_inode_operations = {
3234 .lookup = btrfs_lookup,
fdebe2bd 3235 .permission = btrfs_permission,
39279cc3 3236};
39279cc3
CM		 3237static struct file_operations btrfs_dir_file_operations = {
3238 .llseek = generic_file_llseek,
3239 .read = generic_read_dir,
3240 .readdir = btrfs_readdir,
34287aa3 3241 .unlocked_ioctl = btrfs_ioctl,
39279cc3 3242#ifdef CONFIG_COMPAT
34287aa3 3243 .compat_ioctl = btrfs_ioctl,
39279cc3
CM		 3244#endif
3245};
3246
d1310b2e 3247static struct extent_io_ops btrfs_extent_io_ops = {
07157aac 3248 .fill_delalloc = run_delalloc_range,
065631f6 3249 .submit_bio_hook = btrfs_submit_bio_hook,
239b14b3 3250 .merge_bio_hook = btrfs_merge_bio_hook,
07157aac
CM		 3251 .readpage_io_hook = btrfs_readpage_io_hook,
3252 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
7e38326f 3253 .readpage_io_failed_hook = btrfs_readpage_io_failed_hook,
b0c68f8b
CM		 3254 .set_bit_hook = btrfs_set_bit_hook,
3255 .clear_bit_hook = btrfs_clear_bit_hook,
07157aac
CM		 3256};
3257
39279cc3
CM		 3258static struct address_space_operations btrfs_aops = {
3259 .readpage = btrfs_readpage,
3260 .writepage = btrfs_writepage,
b293f02e 3261 .writepages = btrfs_writepages,
3ab2fb5a 3262 .readpages = btrfs_readpages,
39279cc3 3263 .sync_page = block_sync_page,
39279cc3 3264 .bmap = btrfs_bmap,
16432985 3265 .direct_IO = btrfs_direct_IO,
a52d9a80
CM		 3266 .invalidatepage = btrfs_invalidatepage,
3267 .releasepage = btrfs_releasepage,
3268 .set_page_dirty = __set_page_dirty_nobuffers,
39279cc3
CM		 3269};
3270
3271static struct address_space_operations btrfs_symlink_aops = {
3272 .readpage = btrfs_readpage,
3273 .writepage = btrfs_writepage,
2bf5a725
CM		 3274 .invalidatepage = btrfs_invalidatepage,
3275 .releasepage = btrfs_releasepage,
39279cc3
CM		 3276};
3277
3278static struct inode_operations btrfs_file_inode_operations = {
3279 .truncate = btrfs_truncate,
3280 .getattr = btrfs_getattr,
3281 .setattr = btrfs_setattr,
5103e947
JB		 3282 .setxattr = generic_setxattr,
3283 .getxattr = generic_getxattr,
3284 .listxattr = btrfs_listxattr,
3285 .removexattr = generic_removexattr,
fdebe2bd 3286 .permission = btrfs_permission,
39279cc3 3287};
618e21d5
JB		 3288static struct inode_operations btrfs_special_inode_operations = {
3289 .getattr = btrfs_getattr,
3290 .setattr = btrfs_setattr,
fdebe2bd 3291 .permission = btrfs_permission,
618e21d5 3292};
39279cc3
CM		 3293static struct inode_operations btrfs_symlink_inode_operations = {
3294 .readlink = generic_readlink,
3295 .follow_link = page_follow_link_light,
3296 .put_link = page_put_link,
fdebe2bd 3297 .permission = btrfs_permission,
39279cc3 3298};
Linux 6.x block layer and io_uring tree(s)