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Btrfs: Create a work queue for bio writes
[net-next-2.6.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
44b8bd7e 327int __btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
f188591e 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
44b8bd7e
CM		 334 mutex_lock(&root->fs_info->fs_mutex);
335 trans = btrfs_start_transaction(root, 1);
336 btrfs_set_trans_block_group(trans, inode);
337 btrfs_csum_file_blocks(trans, root, inode, bio);
338 ret = btrfs_end_transaction(trans, root);
339 BUG_ON(ret);
340 mutex_unlock(&root->fs_info->fs_mutex);
341 return btrfs_map_bio(root, rw, bio, mirror_num);
342}
343
344int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
345 int mirror_num)
346{
347 struct btrfs_root *root = BTRFS_I(inode)->root;
348 int ret = 0;
349
22c59948
CM		 350 if (!(rw & (1 << BIO_RW))) {
351 ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
352 BUG_ON(ret);
0b86a832
CM		 353 goto mapit;
354 }
065631f6
CM		 355
356 if (btrfs_test_opt(root, NODATASUM) ||
0b86a832
CM		 357 btrfs_test_flag(inode, NODATASUM)) {
358 goto mapit;
359 }
065631f6 360
44b8bd7e
CM		 361 return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
362 inode, rw, bio, mirror_num,
363 __btrfs_submit_bio_hook);
0b86a832 364mapit:
f188591e 365 return btrfs_map_bio(root, rw, bio, mirror_num);
065631f6 366}
6885f308 367
07157aac
CM		 368int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
369{
370 int ret = 0;
371 struct inode *inode = page->mapping->host;
372 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 373 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
07157aac
CM		 374 struct btrfs_csum_item *item;
375 struct btrfs_path *path = NULL;
ff79f819 376 u32 csum;
b98b6767
Y		 377 if (btrfs_test_opt(root, NODATASUM) ||
378 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 379 return 0;
07157aac
CM		 380 mutex_lock(&root->fs_info->fs_mutex);
381 path = btrfs_alloc_path();
382 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
383 if (IS_ERR(item)) {
384 ret = PTR_ERR(item);
385 /* a csum that isn't present is a preallocated region. */
386 if (ret == -ENOENT || ret == -EFBIG)
387 ret = 0;
ff79f819 388 csum = 0;
aadfeb6e 389 printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start);
07157aac
CM		 390 goto out;
391 }
ff79f819
CM		 392 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
393 BTRFS_CRC32_SIZE);
d1310b2e 394 set_state_private(io_tree, start, csum);
07157aac
CM		 395out:
396 if (path)
397 btrfs_free_path(path);
398 mutex_unlock(&root->fs_info->fs_mutex);
399 return ret;
400}
401
7e38326f
CM		 402struct io_failure_record {
403 struct page *page;
404 u64 start;
405 u64 len;
406 u64 logical;
407 int last_mirror;
408};
409
410int btrfs_readpage_io_failed_hook(struct bio *failed_bio,
411 struct page *page, u64 start, u64 end,
412 struct extent_state *state)
413{
414 struct io_failure_record *failrec = NULL;
415 u64 private;
416 struct extent_map *em;
417 struct inode *inode = page->mapping->host;
418 struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree;
419 struct bio *bio;
420 int num_copies;
421 int ret;
422 u64 logical;
423
424 ret = get_state_private(failure_tree, start, &private);
425 if (ret) {
426 size_t pg_offset = start - page_offset(page);
427 failrec = kmalloc(sizeof(*failrec), GFP_NOFS);
428 if (!failrec)
429 return -ENOMEM;
430 failrec->start = start;
431 failrec->len = end - start + 1;
432 failrec->last_mirror = 0;
433
434 em = btrfs_get_extent(inode, NULL, pg_offset, start,
435 failrec->len, 0);
436
437 if (!em || IS_ERR(em)) {
438 kfree(failrec);
439 return -EIO;
440 }
441 logical = start - em->start;
442 logical = em->block_start + logical;
443 failrec->logical = logical;
444 free_extent_map(em);
445 set_extent_bits(failure_tree, start, end, EXTENT_LOCKED |
446 EXTENT_DIRTY, GFP_NOFS);
587f7704
CM		 447 set_state_private(failure_tree, start,
448 (u64)(unsigned long)failrec);
7e38326f 449 } else {
587f7704 450 failrec = (struct io_failure_record *)(unsigned long)private;
7e38326f
CM		 451 }
452 num_copies = btrfs_num_copies(
453 &BTRFS_I(inode)->root->fs_info->mapping_tree,
454 failrec->logical, failrec->len);
455 failrec->last_mirror++;
456 if (!state) {
457 spin_lock_irq(&BTRFS_I(inode)->io_tree.lock);
458 state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree,
459 failrec->start,
460 EXTENT_LOCKED);
461 if (state && state->start != failrec->start)
462 state = NULL;
463 spin_unlock_irq(&BTRFS_I(inode)->io_tree.lock);
464 }
465 if (!state || failrec->last_mirror > num_copies) {
466 set_state_private(failure_tree, failrec->start, 0);
467 clear_extent_bits(failure_tree, failrec->start,
468 failrec->start + failrec->len - 1,
469 EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS);
470 kfree(failrec);
471 return -EIO;
472 }
473 bio = bio_alloc(GFP_NOFS, 1);
474 bio->bi_private = state;
475 bio->bi_end_io = failed_bio->bi_end_io;
476 bio->bi_sector = failrec->logical >> 9;
477 bio->bi_bdev = failed_bio->bi_bdev;
478 bio_add_page(bio, page, failrec->len, start - page_offset(page));
479 btrfs_submit_bio_hook(inode, READ, bio, failrec->last_mirror);
480 return 0;
481}
482
70dec807
CM		 483int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
484 struct extent_state *state)
07157aac 485{
35ebb934 486 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
07157aac 487 struct inode *inode = page->mapping->host;
d1310b2e 488 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
07157aac 489 char *kaddr;
aadfeb6e 490 u64 private = ~(u32)0;
07157aac 491 int ret;
ff79f819
CM		 492 struct btrfs_root *root = BTRFS_I(inode)->root;
493 u32 csum = ~(u32)0;
bbf0d006 494 unsigned long flags;
d1310b2e 495
b98b6767
Y		 496 if (btrfs_test_opt(root, NODATASUM) ||
497 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 498 return 0;
c2e639f0 499 if (state && state->start == start) {
70dec807
CM		 500 private = state->private;
501 ret = 0;
502 } else {
503 ret = get_state_private(io_tree, start, &private);
504 }
bbf0d006 505 local_irq_save(flags);
07157aac
CM		 506 kaddr = kmap_atomic(page, KM_IRQ0);
507 if (ret) {
508 goto zeroit;
509 }
ff79f819
CM		 510 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
511 btrfs_csum_final(csum, (char *)&csum);
512 if (csum != private) {
07157aac
CM		 513 goto zeroit;
514 }
515 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 516 local_irq_restore(flags);
7e38326f
CM		 517
518 /* if the io failure tree for this inode is non-empty,
519 * check to see if we've recovered from a failed IO
520 */
521 private = 0;
522 if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private,
523 (u64)-1, 1, EXTENT_DIRTY)) {
524 u64 private_failure;
525 struct io_failure_record *failure;
526 ret = get_state_private(&BTRFS_I(inode)->io_failure_tree,
527 start, &private_failure);
528 if (ret == 0) {
587f7704
CM		 529 failure = (struct io_failure_record *)(unsigned long)
530 private_failure;
7e38326f
CM		 531 set_state_private(&BTRFS_I(inode)->io_failure_tree,
532 failure->start, 0);
533 clear_extent_bits(&BTRFS_I(inode)->io_failure_tree,
534 failure->start,
535 failure->start + failure->len - 1,
536 EXTENT_DIRTY | EXTENT_LOCKED,
537 GFP_NOFS);
538 kfree(failure);
539 }
540 }
07157aac
CM		 541 return 0;
542
543zeroit:
aadfeb6e
CM		 544 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
545 page->mapping->host->i_ino, (unsigned long long)start, csum,
546 private);
db94535d
CM		 547 memset(kaddr + offset, 1, end - start + 1);
548 flush_dcache_page(page);
07157aac 549 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 550 local_irq_restore(flags);
7e38326f 551 return -EIO;
07157aac 552}
b888db2b 553
39279cc3
CM		 554void btrfs_read_locked_inode(struct inode *inode)
555{
556 struct btrfs_path *path;
5f39d397 557 struct extent_buffer *leaf;
39279cc3 558 struct btrfs_inode_item *inode_item;
0b86a832 559 struct btrfs_timespec *tspec;
39279cc3
CM		 560 struct btrfs_root *root = BTRFS_I(inode)->root;
561 struct btrfs_key location;
562 u64 alloc_group_block;
618e21d5 563 u32 rdev;
39279cc3
CM		 564 int ret;
565
566 path = btrfs_alloc_path();
567 BUG_ON(!path);
39279cc3 568 mutex_lock(&root->fs_info->fs_mutex);
39279cc3 569 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
dc17ff8f 570
39279cc3 571 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
5f39d397 572 if (ret)
39279cc3 573 goto make_bad;
39279cc3 574
5f39d397
CM		 575 leaf = path->nodes[0];
576 inode_item = btrfs_item_ptr(leaf, path->slots[0],
577 struct btrfs_inode_item);
578
579 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
580 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
581 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
582 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
583 inode->i_size = btrfs_inode_size(leaf, inode_item);
584
585 tspec = btrfs_inode_atime(inode_item);
586 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
587 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
588
589 tspec = btrfs_inode_mtime(inode_item);
590 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
591 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
592
593 tspec = btrfs_inode_ctime(inode_item);
594 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
595 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
596
597 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
598 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
618e21d5 599 inode->i_rdev = 0;
5f39d397
CM		 600 rdev = btrfs_inode_rdev(leaf, inode_item);
601
602 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
39279cc3
CM		 603 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
604 alloc_group_block);
b98b6767 605 BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
e52ec0eb
CM		 606 if (!BTRFS_I(inode)->block_group) {
607 BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
0b86a832
CM		 608 NULL, 0,
609 BTRFS_BLOCK_GROUP_METADATA, 0);
e52ec0eb 610 }
39279cc3
CM		 611 btrfs_free_path(path);
612 inode_item = NULL;
613
614 mutex_unlock(&root->fs_info->fs_mutex);
615
616 switch (inode->i_mode & S_IFMT) {
39279cc3
CM		 617 case S_IFREG:
618 inode->i_mapping->a_ops = &btrfs_aops;
04160088 619 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
d1310b2e 620 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 621 inode->i_fop = &btrfs_file_operations;
622 inode->i_op = &btrfs_file_inode_operations;
623 break;
624 case S_IFDIR:
625 inode->i_fop = &btrfs_dir_file_operations;
626 if (root == root->fs_info->tree_root)
627 inode->i_op = &btrfs_dir_ro_inode_operations;
628 else
629 inode->i_op = &btrfs_dir_inode_operations;
630 break;
631 case S_IFLNK:
632 inode->i_op = &btrfs_symlink_inode_operations;
633 inode->i_mapping->a_ops = &btrfs_symlink_aops;
04160088 634 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3 635 break;
618e21d5
JB		 636 default:
637 init_special_inode(inode, inode->i_mode, rdev);
638 break;
39279cc3
CM		 639 }
640 return;
641
642make_bad:
643 btrfs_release_path(root, path);
644 btrfs_free_path(path);
645 mutex_unlock(&root->fs_info->fs_mutex);
646 make_bad_inode(inode);
647}
648
5f39d397
CM		 649static void fill_inode_item(struct extent_buffer *leaf,
650 struct btrfs_inode_item *item,
39279cc3
CM		 651 struct inode *inode)
652{
5f39d397
CM		 653 btrfs_set_inode_uid(leaf, item, inode->i_uid);
654 btrfs_set_inode_gid(leaf, item, inode->i_gid);
655 btrfs_set_inode_size(leaf, item, inode->i_size);
656 btrfs_set_inode_mode(leaf, item, inode->i_mode);
657 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
658
659 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
660 inode->i_atime.tv_sec);
661 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
662 inode->i_atime.tv_nsec);
663
664 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
665 inode->i_mtime.tv_sec);
666 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
667 inode->i_mtime.tv_nsec);
668
669 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
670 inode->i_ctime.tv_sec);
671 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
672 inode->i_ctime.tv_nsec);
673
674 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
675 btrfs_set_inode_generation(leaf, item, inode->i_generation);
676 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
b98b6767 677 btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
5f39d397 678 btrfs_set_inode_block_group(leaf, item,
39279cc3
CM		 679 BTRFS_I(inode)->block_group->key.objectid);
680}
681
a52d9a80 682int btrfs_update_inode(struct btrfs_trans_handle *trans,
39279cc3
CM		 683 struct btrfs_root *root,
684 struct inode *inode)
685{
686 struct btrfs_inode_item *inode_item;
687 struct btrfs_path *path;
5f39d397 688 struct extent_buffer *leaf;
39279cc3
CM		 689 int ret;
690
691 path = btrfs_alloc_path();
692 BUG_ON(!path);
39279cc3
CM		 693 ret = btrfs_lookup_inode(trans, root, path,
694 &BTRFS_I(inode)->location, 1);
695 if (ret) {
696 if (ret > 0)
697 ret = -ENOENT;
698 goto failed;
699 }
700
5f39d397
CM		 701 leaf = path->nodes[0];
702 inode_item = btrfs_item_ptr(leaf, path->slots[0],
39279cc3
CM		 703 struct btrfs_inode_item);
704
5f39d397
CM		 705 fill_inode_item(leaf, inode_item, inode);
706 btrfs_mark_buffer_dirty(leaf);
15ee9bc7 707 btrfs_set_inode_last_trans(trans, inode);
39279cc3
CM		 708 ret = 0;
709failed:
710 btrfs_release_path(root, path);
711 btrfs_free_path(path);
712 return ret;
713}
714
715
716static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
717 struct btrfs_root *root,
718 struct inode *dir,
719 struct dentry *dentry)
720{
721 struct btrfs_path *path;
722 const char *name = dentry->d_name.name;
723 int name_len = dentry->d_name.len;
724 int ret = 0;
5f39d397 725 struct extent_buffer *leaf;
39279cc3 726 struct btrfs_dir_item *di;
5f39d397 727 struct btrfs_key key;
39279cc3
CM		 728
729 path = btrfs_alloc_path();
54aa1f4d
CM		 730 if (!path) {
731 ret = -ENOMEM;
732 goto err;
733 }
734
39279cc3
CM		 735 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
736 name, name_len, -1);
737 if (IS_ERR(di)) {
738 ret = PTR_ERR(di);
739 goto err;
740 }
741 if (!di) {
742 ret = -ENOENT;
743 goto err;
744 }
5f39d397
CM		 745 leaf = path->nodes[0];
746 btrfs_dir_item_key_to_cpu(leaf, di, &key);
39279cc3 747 ret = btrfs_delete_one_dir_name(trans, root, path, di);
54aa1f4d
CM		 748 if (ret)
749 goto err;
39279cc3
CM		 750 btrfs_release_path(root, path);
751
752 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
5f39d397 753 key.objectid, name, name_len, -1);
39279cc3
CM		 754 if (IS_ERR(di)) {
755 ret = PTR_ERR(di);
756 goto err;
757 }
758 if (!di) {
759 ret = -ENOENT;
760 goto err;
761 }
762 ret = btrfs_delete_one_dir_name(trans, root, path, di);
39279cc3
CM		 763
764 dentry->d_inode->i_ctime = dir->i_ctime;
76fea00a
CM		 765 ret = btrfs_del_inode_ref(trans, root, name, name_len,
766 dentry->d_inode->i_ino,
767 dentry->d_parent->d_inode->i_ino);
768 if (ret) {
769 printk("failed to delete reference to %.*s, "
770 "inode %lu parent %lu\n", name_len, name,
771 dentry->d_inode->i_ino,
772 dentry->d_parent->d_inode->i_ino);
3954401f 773 }
39279cc3
CM		 774err:
775 btrfs_free_path(path);
776 if (!ret) {
777 dir->i_size -= name_len * 2;
79c44584 778 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
39279cc3 779 btrfs_update_inode(trans, root, dir);
6da6abae
CM		 780#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
781 dentry->d_inode->i_nlink--;
782#else
39279cc3 783 drop_nlink(dentry->d_inode);
6da6abae 784#endif
54aa1f4d 785 ret = btrfs_update_inode(trans, root, dentry->d_inode);
39279cc3
CM		 786 dir->i_sb->s_dirt = 1;
787 }
788 return ret;
789}
790
791static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
792{
793 struct btrfs_root *root;
794 struct btrfs_trans_handle *trans;
2da98f00 795 struct inode *inode = dentry->d_inode;
39279cc3 796 int ret;
1832a6d5 797 unsigned long nr = 0;
39279cc3
CM		 798
799 root = BTRFS_I(dir)->root;
800 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 801
802 ret = btrfs_check_free_space(root, 1, 1);
803 if (ret)
804 goto fail;
805
39279cc3 806 trans = btrfs_start_transaction(root, 1);
5f39d397 807
39279cc3
CM		 808 btrfs_set_trans_block_group(trans, dir);
809 ret = btrfs_unlink_trans(trans, root, dir, dentry);
d3c2fdcf 810 nr = trans->blocks_used;
5f39d397 811
2da98f00
CM		 812 if (inode->i_nlink == 0) {
813 int found;
814 /* if the inode isn't linked anywhere,
815 * we don't need to worry about
816 * data=ordered
817 */
818 found = btrfs_del_ordered_inode(inode);
819 if (found == 1) {
820 atomic_dec(&inode->i_count);
821 }
822 }
823
39279cc3 824 btrfs_end_transaction(trans, root);
1832a6d5 825fail:
39279cc3 826 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 827 btrfs_btree_balance_dirty(root, nr);
e2008b61 828 btrfs_throttle(root);
39279cc3
CM		 829 return ret;
830}
831
832static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
833{
834 struct inode *inode = dentry->d_inode;
1832a6d5 835 int err = 0;
39279cc3
CM		 836 int ret;
837 struct btrfs_root *root = BTRFS_I(dir)->root;
39279cc3 838 struct btrfs_trans_handle *trans;
1832a6d5 839 unsigned long nr = 0;
39279cc3 840
134d4512
Y		 841 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
842 return -ENOTEMPTY;
843
39279cc3 844 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 845 ret = btrfs_check_free_space(root, 1, 1);
846 if (ret)
847 goto fail;
848
39279cc3
CM		 849 trans = btrfs_start_transaction(root, 1);
850 btrfs_set_trans_block_group(trans, dir);
39279cc3
CM		 851
852 /* now the directory is empty */
853 err = btrfs_unlink_trans(trans, root, dir, dentry);
854 if (!err) {
855 inode->i_size = 0;
856 }
3954401f 857
d3c2fdcf 858 nr = trans->blocks_used;
39279cc3 859 ret = btrfs_end_transaction(trans, root);
1832a6d5 860fail:
134d4512 861 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 862 btrfs_btree_balance_dirty(root, nr);
e2008b61 863 btrfs_throttle(root);
3954401f 864
39279cc3
CM		 865 if (ret && !err)
866 err = ret;
867 return err;
868}
869
39279cc3
CM		 870/*
871 * this can truncate away extent items, csum items and directory items.
872 * It starts at a high offset and removes keys until it can't find
873 * any higher than i_size.
874 *
875 * csum items that cross the new i_size are truncated to the new size
876 * as well.
877 */
878static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
879 struct btrfs_root *root,
85e21bac
CM		 880 struct inode *inode,
881 u32 min_type)
39279cc3
CM		 882{
883 int ret;
884 struct btrfs_path *path;
885 struct btrfs_key key;
5f39d397 886 struct btrfs_key found_key;
39279cc3 887 u32 found_type;
5f39d397 888 struct extent_buffer *leaf;
39279cc3
CM		 889 struct btrfs_file_extent_item *fi;
890 u64 extent_start = 0;
db94535d 891 u64 extent_num_bytes = 0;
39279cc3 892 u64 item_end = 0;
7bb86316 893 u64 root_gen = 0;
d8d5f3e1 894 u64 root_owner = 0;
39279cc3
CM		 895 int found_extent;
896 int del_item;
85e21bac
CM		 897 int pending_del_nr = 0;
898 int pending_del_slot = 0;
179e29e4 899 int extent_type = -1;
39279cc3 900
a52d9a80 901 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
39279cc3 902 path = btrfs_alloc_path();
3c69faec 903 path->reada = -1;
39279cc3 904 BUG_ON(!path);
5f39d397 905
39279cc3
CM		 906 /* FIXME, add redo link to tree so we don't leak on crash */
907 key.objectid = inode->i_ino;
908 key.offset = (u64)-1;
5f39d397
CM		 909 key.type = (u8)-1;
910
85e21bac
CM		 911 btrfs_init_path(path);
912search_again:
913 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
914 if (ret < 0) {
915 goto error;
916 }
917 if (ret > 0) {
918 BUG_ON(path->slots[0] == 0);
919 path->slots[0]--;
920 }
921
39279cc3 922 while(1) {
39279cc3 923 fi = NULL;
5f39d397
CM		 924 leaf = path->nodes[0];
925 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
926 found_type = btrfs_key_type(&found_key);
39279cc3 927
5f39d397 928 if (found_key.objectid != inode->i_ino)
39279cc3 929 break;
5f39d397 930
85e21bac 931 if (found_type < min_type)
39279cc3
CM		 932 break;
933
5f39d397 934 item_end = found_key.offset;
39279cc3 935 if (found_type == BTRFS_EXTENT_DATA_KEY) {
5f39d397 936 fi = btrfs_item_ptr(leaf, path->slots[0],
39279cc3 937 struct btrfs_file_extent_item);
179e29e4
CM		 938 extent_type = btrfs_file_extent_type(leaf, fi);
939 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
5f39d397 940 item_end +=
db94535d 941 btrfs_file_extent_num_bytes(leaf, fi);
179e29e4
CM		 942 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
943 struct btrfs_item *item = btrfs_item_nr(leaf,
944 path->slots[0]);
945 item_end += btrfs_file_extent_inline_len(leaf,
946 item);
39279cc3 947 }
008630c1 948 item_end--;
39279cc3
CM		 949 }
950 if (found_type == BTRFS_CSUM_ITEM_KEY) {
951 ret = btrfs_csum_truncate(trans, root, path,
952 inode->i_size);
953 BUG_ON(ret);
954 }
008630c1 955 if (item_end < inode->i_size) {
b888db2b
CM		 956 if (found_type == BTRFS_DIR_ITEM_KEY) {
957 found_type = BTRFS_INODE_ITEM_KEY;
958 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
959 found_type = BTRFS_CSUM_ITEM_KEY;
85e21bac
CM		 960 } else if (found_type == BTRFS_EXTENT_DATA_KEY) {
961 found_type = BTRFS_XATTR_ITEM_KEY;
962 } else if (found_type == BTRFS_XATTR_ITEM_KEY) {
963 found_type = BTRFS_INODE_REF_KEY;
b888db2b
CM		 964 } else if (found_type) {
965 found_type--;
966 } else {
967 break;
39279cc3 968 }
a61721d5 969 btrfs_set_key_type(&key, found_type);
85e21bac 970 goto next;
39279cc3 971 }
5f39d397 972 if (found_key.offset >= inode->i_size)
39279cc3
CM		 973 del_item = 1;
974 else
975 del_item = 0;
976 found_extent = 0;
977
978 /* FIXME, shrink the extent if the ref count is only 1 */
179e29e4
CM		 979 if (found_type != BTRFS_EXTENT_DATA_KEY)
980 goto delete;
981
982 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
39279cc3 983 u64 num_dec;
db94535d 984 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
39279cc3 985 if (!del_item) {
db94535d
CM		 986 u64 orig_num_bytes =
987 btrfs_file_extent_num_bytes(leaf, fi);
988 extent_num_bytes = inode->i_size -
5f39d397 989 found_key.offset + root->sectorsize - 1;
b1632b10
Y		 990 extent_num_bytes = extent_num_bytes &
991 ~((u64)root->sectorsize - 1);
db94535d
CM		 992 btrfs_set_file_extent_num_bytes(leaf, fi,
993 extent_num_bytes);
994 num_dec = (orig_num_bytes -
9069218d
CM		 995 extent_num_bytes);
996 if (extent_start != 0)
997 dec_i_blocks(inode, num_dec);
5f39d397 998 btrfs_mark_buffer_dirty(leaf);
39279cc3 999 } else {
db94535d
CM		 1000 extent_num_bytes =
1001 btrfs_file_extent_disk_num_bytes(leaf,
1002 fi);
39279cc3 1003 /* FIXME blocksize != 4096 */
9069218d 1004 num_dec = btrfs_file_extent_num_bytes(leaf, fi);
39279cc3
CM		 1005 if (extent_start != 0) {
1006 found_extent = 1;
9069218d 1007 dec_i_blocks(inode, num_dec);
39279cc3 1008 }
d8d5f3e1
CM		 1009 root_gen = btrfs_header_generation(leaf);
1010 root_owner = btrfs_header_owner(leaf);
39279cc3 1011 }
9069218d
CM		 1012 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
1013 if (!del_item) {
1014 u32 newsize = inode->i_size - found_key.offset;
1015 dec_i_blocks(inode, item_end + 1 -
1016 found_key.offset - newsize);
1017 newsize =
1018 btrfs_file_extent_calc_inline_size(newsize);
1019 ret = btrfs_truncate_item(trans, root, path,
1020 newsize, 1);
1021 BUG_ON(ret);
1022 } else {
1023 dec_i_blocks(inode, item_end + 1 -
1024 found_key.offset);
1025 }
39279cc3 1026 }
179e29e4 1027delete:
39279cc3 1028 if (del_item) {
85e21bac
CM		 1029 if (!pending_del_nr) {
1030 /* no pending yet, add ourselves */
1031 pending_del_slot = path->slots[0];
1032 pending_del_nr = 1;
1033 } else if (pending_del_nr &&
1034 path->slots[0] + 1 == pending_del_slot) {
1035 /* hop on the pending chunk */
1036 pending_del_nr++;
1037 pending_del_slot = path->slots[0];
1038 } else {
1039 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot);
1040 }
39279cc3
CM		 1041 } else {
1042 break;
1043 }
39279cc3
CM		 1044 if (found_extent) {
1045 ret = btrfs_free_extent(trans, root, extent_start,
7bb86316 1046 extent_num_bytes,
d8d5f3e1 1047 root_owner,
7bb86316
CM		 1048 root_gen, inode->i_ino,
1049 found_key.offset, 0);
39279cc3
CM		 1050 BUG_ON(ret);
1051 }
85e21bac
CM		 1052next:
1053 if (path->slots[0] == 0) {
1054 if (pending_del_nr)
1055 goto del_pending;
1056 btrfs_release_path(root, path);
1057 goto search_again;
1058 }
1059
1060 path->slots[0]--;
1061 if (pending_del_nr &&
1062 path->slots[0] + 1 != pending_del_slot) {
1063 struct btrfs_key debug;
1064del_pending:
1065 btrfs_item_key_to_cpu(path->nodes[0], &debug,
1066 pending_del_slot);
1067 ret = btrfs_del_items(trans, root, path,
1068 pending_del_slot,
1069 pending_del_nr);
1070 BUG_ON(ret);
1071 pending_del_nr = 0;
1072 btrfs_release_path(root, path);
1073 goto search_again;
1074 }
39279cc3
CM		 1075 }
1076 ret = 0;
1077error:
85e21bac
CM		 1078 if (pending_del_nr) {
1079 ret = btrfs_del_items(trans, root, path, pending_del_slot,
1080 pending_del_nr);
1081 }
39279cc3
CM		 1082 btrfs_release_path(root, path);
1083 btrfs_free_path(path);
1084 inode->i_sb->s_dirt = 1;
1085 return ret;
1086}
1087
b888db2b 1088static int btrfs_cow_one_page(struct inode *inode, struct page *page,
a52d9a80
CM		 1089 size_t zero_start)
1090{
1091 char *kaddr;
d1310b2e 1092 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
35ebb934 1093 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
b888db2b 1094 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
1832a6d5 1095 int ret = 0;
a52d9a80 1096
190662b2 1097 WARN_ON(!PageLocked(page));
b3cfa35a 1098 set_page_extent_mapped(page);
a52d9a80 1099
d1310b2e 1100 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
d1310b2e 1101 set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start,
b888db2b 1102 page_end, GFP_NOFS);
1832a6d5 1103
a52d9a80 1104 if (zero_start != PAGE_CACHE_SIZE) {
b888db2b 1105 kaddr = kmap(page);
a52d9a80
CM		 1106 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
1107 flush_dcache_page(page);
b888db2b 1108 kunmap(page);
a52d9a80 1109 }
b888db2b 1110 set_page_dirty(page);
d1310b2e 1111 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
a52d9a80 1112
a52d9a80
CM		 1113 return ret;
1114}
1115
39279cc3
CM		 1116/*
1117 * taken from block_truncate_page, but does cow as it zeros out
1118 * any bytes left in the last page in the file.
1119 */
1120static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
1121{
1122 struct inode *inode = mapping->host;
db94535d
CM		 1123 struct btrfs_root *root = BTRFS_I(inode)->root;
1124 u32 blocksize = root->sectorsize;
39279cc3
CM		 1125 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1126 unsigned offset = from & (PAGE_CACHE_SIZE-1);
1127 struct page *page;
39279cc3 1128 int ret = 0;
a52d9a80 1129 u64 page_start;
39279cc3
CM		 1130
1131 if ((offset & (blocksize - 1)) == 0)
1132 goto out;
1133
1134 ret = -ENOMEM;
1135 page = grab_cache_page(mapping, index);
1136 if (!page)
1137 goto out;
39279cc3 1138 if (!PageUptodate(page)) {
9ebefb18 1139 ret = btrfs_readpage(NULL, page);
39279cc3
CM		 1140 lock_page(page);
1141 if (!PageUptodate(page)) {
1142 ret = -EIO;
1143 goto out;
1144 }
1145 }
35ebb934 1146 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 1147
b888db2b 1148 ret = btrfs_cow_one_page(inode, page, offset);
39279cc3 1149
39279cc3
CM		 1150 unlock_page(page);
1151 page_cache_release(page);
1152out:
1153 return ret;
1154}
1155
1156static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
1157{
1158 struct inode *inode = dentry->d_inode;
1159 int err;
1160
1161 err = inode_change_ok(inode, attr);
1162 if (err)
1163 return err;
1164
1165 if (S_ISREG(inode->i_mode) &&
1166 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
1167 struct btrfs_trans_handle *trans;
1168 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 1169 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2bf5a725 1170
5f39d397 1171 u64 mask = root->sectorsize - 1;
1b0f7c29 1172 u64 hole_start = (inode->i_size + mask) & ~mask;
f392a938 1173 u64 block_end = (attr->ia_size + mask) & ~mask;
39279cc3 1174 u64 hole_size;
179e29e4 1175 u64 alloc_hint = 0;
39279cc3 1176
1b0f7c29 1177 if (attr->ia_size <= hole_start)
39279cc3
CM		 1178 goto out;
1179
1832a6d5
CM		 1180 mutex_lock(&root->fs_info->fs_mutex);
1181 err = btrfs_check_free_space(root, 1, 0);
1182 mutex_unlock(&root->fs_info->fs_mutex);
1183 if (err)
1184 goto fail;
1185
39279cc3
CM		 1186 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1187
1b0f7c29 1188 lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
5f56406a 1189 hole_size = block_end - hole_start;
39279cc3
CM		 1190
1191 mutex_lock(&root->fs_info->fs_mutex);
1192 trans = btrfs_start_transaction(root, 1);
1193 btrfs_set_trans_block_group(trans, inode);
2bf5a725 1194 err = btrfs_drop_extents(trans, root, inode,
1b0f7c29 1195 hole_start, block_end, hole_start,
3326d1b0 1196 &alloc_hint);
2bf5a725 1197
179e29e4
CM		 1198 if (alloc_hint != EXTENT_MAP_INLINE) {
1199 err = btrfs_insert_file_extent(trans, root,
1200 inode->i_ino,
5f56406a
CM		 1201 hole_start, 0, 0,
1202 hole_size);
d1310b2e
CM		 1203 btrfs_drop_extent_cache(inode, hole_start,
1204 hole_size - 1);
5f56406a 1205 btrfs_check_file(root, inode);
179e29e4 1206 }
39279cc3
CM		 1207 btrfs_end_transaction(trans, root);
1208 mutex_unlock(&root->fs_info->fs_mutex);
1b0f7c29 1209 unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
54aa1f4d
CM		 1210 if (err)
1211 return err;
39279cc3
CM		 1212 }
1213out:
1214 err = inode_setattr(inode, attr);
1832a6d5 1215fail:
39279cc3
CM		 1216 return err;
1217}
61295eb8 1218
2da98f00 1219void btrfs_put_inode(struct inode *inode)
61295eb8 1220{
2da98f00
CM		 1221 int ret;
1222
1223 if (!BTRFS_I(inode)->ordered_trans) {
61295eb8
CM		 1224 return;
1225 }
2da98f00
CM		 1226
1227 if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
1228 mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))
1229 return;
1230
1231 ret = btrfs_del_ordered_inode(inode);
1232 if (ret == 1) {
1233 atomic_dec(&inode->i_count);
1234 }
61295eb8
CM		 1235}
1236
39279cc3
CM		 1237void btrfs_delete_inode(struct inode *inode)
1238{
1239 struct btrfs_trans_handle *trans;
1240 struct btrfs_root *root = BTRFS_I(inode)->root;
d3c2fdcf 1241 unsigned long nr;
39279cc3
CM		 1242 int ret;
1243
1244 truncate_inode_pages(&inode->i_data, 0);
1245 if (is_bad_inode(inode)) {
1246 goto no_delete;
1247 }
5f39d397 1248
39279cc3
CM		 1249 inode->i_size = 0;
1250 mutex_lock(&root->fs_info->fs_mutex);
1251 trans = btrfs_start_transaction(root, 1);
5f39d397 1252
39279cc3 1253 btrfs_set_trans_block_group(trans, inode);
85e21bac 1254 ret = btrfs_truncate_in_trans(trans, root, inode, 0);
54aa1f4d
CM		 1255 if (ret)
1256 goto no_delete_lock;
85e21bac 1257
d3c2fdcf 1258 nr = trans->blocks_used;
85e21bac 1259 clear_inode(inode);
5f39d397 1260
39279cc3
CM		 1261 btrfs_end_transaction(trans, root);
1262 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1263 btrfs_btree_balance_dirty(root, nr);
e2008b61 1264 btrfs_throttle(root);
39279cc3 1265 return;
54aa1f4d
CM		 1266
1267no_delete_lock:
d3c2fdcf 1268 nr = trans->blocks_used;
54aa1f4d
CM		 1269 btrfs_end_transaction(trans, root);
1270 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1271 btrfs_btree_balance_dirty(root, nr);
e2008b61 1272 btrfs_throttle(root);
39279cc3
CM		 1273no_delete:
1274 clear_inode(inode);
1275}
1276
1277/*
1278 * this returns the key found in the dir entry in the location pointer.
1279 * If no dir entries were found, location->objectid is 0.
1280 */
1281static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1282 struct btrfs_key *location)
1283{
1284 const char *name = dentry->d_name.name;
1285 int namelen = dentry->d_name.len;
1286 struct btrfs_dir_item *di;
1287 struct btrfs_path *path;
1288 struct btrfs_root *root = BTRFS_I(dir)->root;
0d9f7f3e 1289 int ret = 0;
39279cc3 1290
3954401f
CM		 1291 if (namelen == 1 && strcmp(name, ".") == 0) {
1292 location->objectid = dir->i_ino;
1293 location->type = BTRFS_INODE_ITEM_KEY;
1294 location->offset = 0;
1295 return 0;
1296 }
39279cc3
CM		 1297 path = btrfs_alloc_path();
1298 BUG_ON(!path);
3954401f 1299
7a720536 1300 if (namelen == 2 && strcmp(name, "..") == 0) {
3954401f
CM		 1301 struct btrfs_key key;
1302 struct extent_buffer *leaf;
1303 u32 nritems;
1304 int slot;
1305
1306 key.objectid = dir->i_ino;
1307 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1308 key.offset = 0;
1309 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1310 BUG_ON(ret == 0);
1311 ret = 0;
1312
1313 leaf = path->nodes[0];
1314 slot = path->slots[0];
1315 nritems = btrfs_header_nritems(leaf);
1316 if (slot >= nritems)
1317 goto out_err;
1318
1319 btrfs_item_key_to_cpu(leaf, &key, slot);
1320 if (key.objectid != dir->i_ino ||
1321 key.type != BTRFS_INODE_REF_KEY) {
1322 goto out_err;
1323 }
1324 location->objectid = key.offset;
1325 location->type = BTRFS_INODE_ITEM_KEY;
1326 location->offset = 0;
1327 goto out;
1328 }
1329
39279cc3
CM		 1330 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1331 namelen, 0);
0d9f7f3e
Y		 1332 if (IS_ERR(di))
1333 ret = PTR_ERR(di);
39279cc3 1334 if (!di || IS_ERR(di)) {
3954401f 1335 goto out_err;
39279cc3 1336 }
5f39d397 1337 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
39279cc3 1338out:
39279cc3
CM		 1339 btrfs_free_path(path);
1340 return ret;
3954401f
CM		 1341out_err:
1342 location->objectid = 0;
1343 goto out;
39279cc3
CM		 1344}
1345
1346/*
1347 * when we hit a tree root in a directory, the btrfs part of the inode
1348 * needs to be changed to reflect the root directory of the tree root. This
1349 * is kind of like crossing a mount point.
1350 */
1351static int fixup_tree_root_location(struct btrfs_root *root,
1352 struct btrfs_key *location,
58176a96
JB		 1353 struct btrfs_root **sub_root,
1354 struct dentry *dentry)
39279cc3
CM		 1355{
1356 struct btrfs_path *path;
1357 struct btrfs_root_item *ri;
1358
1359 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1360 return 0;
1361 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1362 return 0;
1363
1364 path = btrfs_alloc_path();
1365 BUG_ON(!path);
1366 mutex_lock(&root->fs_info->fs_mutex);
1367
58176a96
JB		 1368 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1369 dentry->d_name.name,
1370 dentry->d_name.len);
39279cc3
CM		 1371 if (IS_ERR(*sub_root))
1372 return PTR_ERR(*sub_root);
1373
1374 ri = &(*sub_root)->root_item;
1375 location->objectid = btrfs_root_dirid(ri);
39279cc3
CM		 1376 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1377 location->offset = 0;
1378
1379 btrfs_free_path(path);
1380 mutex_unlock(&root->fs_info->fs_mutex);
1381 return 0;
1382}
1383
1384static int btrfs_init_locked_inode(struct inode *inode, void *p)
1385{
1386 struct btrfs_iget_args *args = p;
1387 inode->i_ino = args->ino;
1388 BTRFS_I(inode)->root = args->root;
9069218d 1389 BTRFS_I(inode)->delalloc_bytes = 0;
d1310b2e
CM		 1390 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1391 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
b888db2b 1392 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 1393 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1394 inode->i_mapping, GFP_NOFS);
39279cc3
CM		 1395 return 0;
1396}
1397
1398static int btrfs_find_actor(struct inode *inode, void *opaque)
1399{
1400 struct btrfs_iget_args *args = opaque;
1401 return (args->ino == inode->i_ino &&
1402 args->root == BTRFS_I(inode)->root);
1403}
1404
dc17ff8f
CM		 1405struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1406 u64 root_objectid)
1407{
1408 struct btrfs_iget_args args;
1409 args.ino = objectid;
1410 args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);
1411
1412 if (!args.root)
1413 return NULL;
1414
1415 return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
1416}
1417
39279cc3
CM		 1418struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1419 struct btrfs_root *root)
1420{
1421 struct inode *inode;
1422 struct btrfs_iget_args args;
1423 args.ino = objectid;
1424 args.root = root;
1425
1426 inode = iget5_locked(s, objectid, btrfs_find_actor,
1427 btrfs_init_locked_inode,
1428 (void *)&args);
1429 return inode;
1430}
1431
1432static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1433 struct nameidata *nd)
1434{
1435 struct inode * inode;
1436 struct btrfs_inode *bi = BTRFS_I(dir);
1437 struct btrfs_root *root = bi->root;
1438 struct btrfs_root *sub_root = root;
1439 struct btrfs_key location;
1440 int ret;
1441
1442 if (dentry->d_name.len > BTRFS_NAME_LEN)
1443 return ERR_PTR(-ENAMETOOLONG);
5f39d397 1444
39279cc3
CM		 1445 mutex_lock(&root->fs_info->fs_mutex);
1446 ret = btrfs_inode_by_name(dir, dentry, &location);
1447 mutex_unlock(&root->fs_info->fs_mutex);
5f39d397 1448
39279cc3
CM		 1449 if (ret < 0)
1450 return ERR_PTR(ret);
5f39d397 1451
39279cc3
CM		 1452 inode = NULL;
1453 if (location.objectid) {
58176a96
JB		 1454 ret = fixup_tree_root_location(root, &location, &sub_root,
1455 dentry);
39279cc3
CM		 1456 if (ret < 0)
1457 return ERR_PTR(ret);
1458 if (ret > 0)
1459 return ERR_PTR(-ENOENT);
1460 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1461 sub_root);
1462 if (!inode)
1463 return ERR_PTR(-EACCES);
1464 if (inode->i_state & I_NEW) {
1465 /* the inode and parent dir are two different roots */
1466 if (sub_root != root) {
1467 igrab(inode);
1468 sub_root->inode = inode;
1469 }
1470 BTRFS_I(inode)->root = sub_root;
1471 memcpy(&BTRFS_I(inode)->location, &location,
1472 sizeof(location));
1473 btrfs_read_locked_inode(inode);
1474 unlock_new_inode(inode);
1475 }
1476 }
1477 return d_splice_alias(inode, dentry);
1478}
1479
39279cc3
CM		 1480static unsigned char btrfs_filetype_table[] = {
1481 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1482};
1483
1484static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1485{
6da6abae 1486 struct inode *inode = filp->f_dentry->d_inode;
39279cc3
CM		 1487 struct btrfs_root *root = BTRFS_I(inode)->root;
1488 struct btrfs_item *item;
1489 struct btrfs_dir_item *di;
1490 struct btrfs_key key;
5f39d397 1491 struct btrfs_key found_key;
39279cc3
CM		 1492 struct btrfs_path *path;
1493 int ret;
1494 u32 nritems;
5f39d397 1495 struct extent_buffer *leaf;
39279cc3
CM		 1496 int slot;
1497 int advance;
1498 unsigned char d_type;
1499 int over = 0;
1500 u32 di_cur;
1501 u32 di_total;
1502 u32 di_len;
1503 int key_type = BTRFS_DIR_INDEX_KEY;
5f39d397
CM		 1504 char tmp_name[32];
1505 char *name_ptr;
1506 int name_len;
39279cc3
CM		 1507
1508 /* FIXME, use a real flag for deciding about the key type */
1509 if (root->fs_info->tree_root == root)
1510 key_type = BTRFS_DIR_ITEM_KEY;
5f39d397 1511
3954401f
CM		 1512 /* special case for "." */
1513 if (filp->f_pos == 0) {
1514 over = filldir(dirent, ".", 1,
1515 1, inode->i_ino,
1516 DT_DIR);
1517 if (over)
1518 return 0;
1519 filp->f_pos = 1;
1520 }
1521
39279cc3
CM		 1522 mutex_lock(&root->fs_info->fs_mutex);
1523 key.objectid = inode->i_ino;
3954401f
CM		 1524 path = btrfs_alloc_path();
1525 path->reada = 2;
1526
1527 /* special case for .., just use the back ref */
1528 if (filp->f_pos == 1) {
1529 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1530 key.offset = 0;
1531 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1532 BUG_ON(ret == 0);
1533 leaf = path->nodes[0];
1534 slot = path->slots[0];
1535 nritems = btrfs_header_nritems(leaf);
1536 if (slot >= nritems) {
1537 btrfs_release_path(root, path);
1538 goto read_dir_items;
1539 }
1540 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1541 btrfs_release_path(root, path);
1542 if (found_key.objectid != key.objectid ||
1543 found_key.type != BTRFS_INODE_REF_KEY)
1544 goto read_dir_items;
1545 over = filldir(dirent, "..", 2,
1546 2, found_key.offset, DT_DIR);
1547 if (over)
1548 goto nopos;
1549 filp->f_pos = 2;
1550 }
1551
1552read_dir_items:
39279cc3
CM		 1553 btrfs_set_key_type(&key, key_type);
1554 key.offset = filp->f_pos;
5f39d397 1555
39279cc3
CM		 1556 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1557 if (ret < 0)
1558 goto err;
1559 advance = 0;
39279cc3 1560 while(1) {
5f39d397
CM		 1561 leaf = path->nodes[0];
1562 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1563 slot = path->slots[0];
1564 if (advance || slot >= nritems) {
1565 if (slot >= nritems -1) {
39279cc3
CM		 1566 ret = btrfs_next_leaf(root, path);
1567 if (ret)
1568 break;
5f39d397
CM		 1569 leaf = path->nodes[0];
1570 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1571 slot = path->slots[0];
1572 } else {
1573 slot++;
1574 path->slots[0]++;
1575 }
1576 }
1577 advance = 1;
5f39d397
CM		 1578 item = btrfs_item_nr(leaf, slot);
1579 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1580
1581 if (found_key.objectid != key.objectid)
39279cc3 1582 break;
5f39d397 1583 if (btrfs_key_type(&found_key) != key_type)
39279cc3 1584 break;
5f39d397 1585 if (found_key.offset < filp->f_pos)
39279cc3 1586 continue;
5f39d397
CM		 1587
1588 filp->f_pos = found_key.offset;
39279cc3
CM		 1589 advance = 1;
1590 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1591 di_cur = 0;
5f39d397 1592 di_total = btrfs_item_size(leaf, item);
39279cc3 1593 while(di_cur < di_total) {
5f39d397
CM		 1594 struct btrfs_key location;
1595
1596 name_len = btrfs_dir_name_len(leaf, di);
1597 if (name_len < 32) {
1598 name_ptr = tmp_name;
1599 } else {
1600 name_ptr = kmalloc(name_len, GFP_NOFS);
1601 BUG_ON(!name_ptr);
1602 }
1603 read_extent_buffer(leaf, name_ptr,
1604 (unsigned long)(di + 1), name_len);
1605
1606 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1607 btrfs_dir_item_key_to_cpu(leaf, di, &location);
5f39d397
CM		 1608 over = filldir(dirent, name_ptr, name_len,
1609 found_key.offset,
1610 location.objectid,
39279cc3 1611 d_type);
5f39d397
CM		 1612
1613 if (name_ptr != tmp_name)
1614 kfree(name_ptr);
1615
39279cc3
CM		 1616 if (over)
1617 goto nopos;
5103e947
JB		 1618 di_len = btrfs_dir_name_len(leaf, di) +
1619 btrfs_dir_data_len(leaf, di) +sizeof(*di);
39279cc3
CM		 1620 di_cur += di_len;
1621 di = (struct btrfs_dir_item *)((char *)di + di_len);
1622 }
1623 }
5e591a07
YZ		 1624 if (key_type == BTRFS_DIR_INDEX_KEY)
1625 filp->f_pos = INT_LIMIT(typeof(filp->f_pos));
1626 else
1627 filp->f_pos++;
39279cc3
CM		 1628nopos:
1629 ret = 0;
1630err:
1631 btrfs_release_path(root, path);
1632 btrfs_free_path(path);
1633 mutex_unlock(&root->fs_info->fs_mutex);
1634 return ret;
1635}
1636
1637int btrfs_write_inode(struct inode *inode, int wait)
1638{
1639 struct btrfs_root *root = BTRFS_I(inode)->root;
1640 struct btrfs_trans_handle *trans;
1641 int ret = 0;
1642
1643 if (wait) {
1644 mutex_lock(&root->fs_info->fs_mutex);
1645 trans = btrfs_start_transaction(root, 1);
1646 btrfs_set_trans_block_group(trans, inode);
1647 ret = btrfs_commit_transaction(trans, root);
1648 mutex_unlock(&root->fs_info->fs_mutex);
1649 }
1650 return ret;
1651}
1652
1653/*
54aa1f4d 1654 * This is somewhat expensive, updating the tree every time the
39279cc3
CM		 1655 * inode changes. But, it is most likely to find the inode in cache.
1656 * FIXME, needs more benchmarking...there are no reasons other than performance
1657 * to keep or drop this code.
1658 */
1659void btrfs_dirty_inode(struct inode *inode)
1660{
1661 struct btrfs_root *root = BTRFS_I(inode)->root;
1662 struct btrfs_trans_handle *trans;
1663
1664 mutex_lock(&root->fs_info->fs_mutex);
1665 trans = btrfs_start_transaction(root, 1);
1666 btrfs_set_trans_block_group(trans, inode);
1667 btrfs_update_inode(trans, root, inode);
1668 btrfs_end_transaction(trans, root);
1669 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 1670}
1671
1672static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1673 struct btrfs_root *root,
9c58309d
CM		 1674 const char *name, int name_len,
1675 u64 ref_objectid,
39279cc3
CM		 1676 u64 objectid,
1677 struct btrfs_block_group_cache *group,
1678 int mode)
1679{
1680 struct inode *inode;
5f39d397 1681 struct btrfs_inode_item *inode_item;
6324fbf3 1682 struct btrfs_block_group_cache *new_inode_group;
39279cc3 1683 struct btrfs_key *location;
5f39d397 1684 struct btrfs_path *path;
9c58309d
CM		 1685 struct btrfs_inode_ref *ref;
1686 struct btrfs_key key[2];
1687 u32 sizes[2];
1688 unsigned long ptr;
39279cc3
CM		 1689 int ret;
1690 int owner;
1691
5f39d397
CM		 1692 path = btrfs_alloc_path();
1693 BUG_ON(!path);
1694
39279cc3
CM		 1695 inode = new_inode(root->fs_info->sb);
1696 if (!inode)
1697 return ERR_PTR(-ENOMEM);
1698
d1310b2e
CM		 1699 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1700 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
b888db2b 1701 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 1702 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1703 inode->i_mapping, GFP_NOFS);
9069218d 1704 BTRFS_I(inode)->delalloc_bytes = 0;
39279cc3 1705 BTRFS_I(inode)->root = root;
b888db2b 1706
39279cc3
CM		 1707 if (mode & S_IFDIR)
1708 owner = 0;
1709 else
1710 owner = 1;
6324fbf3 1711 new_inode_group = btrfs_find_block_group(root, group, 0,
0b86a832 1712 BTRFS_BLOCK_GROUP_METADATA, owner);
6324fbf3
CM		 1713 if (!new_inode_group) {
1714 printk("find_block group failed\n");
1715 new_inode_group = group;
1716 }
1717 BTRFS_I(inode)->block_group = new_inode_group;
b98b6767 1718 BTRFS_I(inode)->flags = 0;
9c58309d
CM		 1719
1720 key[0].objectid = objectid;
1721 btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY);
1722 key[0].offset = 0;
1723
1724 key[1].objectid = objectid;
1725 btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY);
1726 key[1].offset = ref_objectid;
1727
1728 sizes[0] = sizeof(struct btrfs_inode_item);
1729 sizes[1] = name_len + sizeof(*ref);
1730
1731 ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2);
1732 if (ret != 0)
5f39d397
CM		 1733 goto fail;
1734
9c58309d
CM		 1735 if (objectid > root->highest_inode)
1736 root->highest_inode = objectid;
1737
39279cc3
CM		 1738 inode->i_uid = current->fsuid;
1739 inode->i_gid = current->fsgid;
1740 inode->i_mode = mode;
1741 inode->i_ino = objectid;
1742 inode->i_blocks = 0;
1743 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
5f39d397
CM		 1744 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1745 struct btrfs_inode_item);
1746 fill_inode_item(path->nodes[0], inode_item, inode);
9c58309d
CM		 1747
1748 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
1749 struct btrfs_inode_ref);
1750 btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
1751 ptr = (unsigned long)(ref + 1);
1752 write_extent_buffer(path->nodes[0], name, ptr, name_len);
1753
5f39d397
CM		 1754 btrfs_mark_buffer_dirty(path->nodes[0]);
1755 btrfs_free_path(path);
1756
39279cc3
CM		 1757 location = &BTRFS_I(inode)->location;
1758 location->objectid = objectid;
39279cc3
CM		 1759 location->offset = 0;
1760 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1761
39279cc3
CM		 1762 insert_inode_hash(inode);
1763 return inode;
5f39d397
CM		 1764fail:
1765 btrfs_free_path(path);
1766 return ERR_PTR(ret);
39279cc3
CM		 1767}
1768
1769static inline u8 btrfs_inode_type(struct inode *inode)
1770{
1771 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1772}
1773
1774static int btrfs_add_link(struct btrfs_trans_handle *trans,
9c58309d
CM		 1775 struct dentry *dentry, struct inode *inode,
1776 int add_backref)
39279cc3
CM		 1777{
1778 int ret;
1779 struct btrfs_key key;
1780 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
79c44584 1781 struct inode *parent_inode;
5f39d397 1782
39279cc3 1783 key.objectid = inode->i_ino;
39279cc3
CM		 1784 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1785 key.offset = 0;
1786
1787 ret = btrfs_insert_dir_item(trans, root,
1788 dentry->d_name.name, dentry->d_name.len,
1789 dentry->d_parent->d_inode->i_ino,
1790 &key, btrfs_inode_type(inode));
1791 if (ret == 0) {
9c58309d
CM		 1792 if (add_backref) {
1793 ret = btrfs_insert_inode_ref(trans, root,
1794 dentry->d_name.name,
1795 dentry->d_name.len,
1796 inode->i_ino,
1797 dentry->d_parent->d_inode->i_ino);
1798 }
79c44584
CM		 1799 parent_inode = dentry->d_parent->d_inode;
1800 parent_inode->i_size += dentry->d_name.len * 2;
1801 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
39279cc3
CM		 1802 ret = btrfs_update_inode(trans, root,
1803 dentry->d_parent->d_inode);
1804 }
1805 return ret;
1806}
1807
1808static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
9c58309d
CM		 1809 struct dentry *dentry, struct inode *inode,
1810 int backref)
39279cc3 1811{
9c58309d 1812 int err = btrfs_add_link(trans, dentry, inode, backref);
39279cc3
CM		 1813 if (!err) {
1814 d_instantiate(dentry, inode);
1815 return 0;
1816 }
1817 if (err > 0)
1818 err = -EEXIST;
1819 return err;
1820}
1821
618e21d5
JB		 1822static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1823 int mode, dev_t rdev)
1824{
1825 struct btrfs_trans_handle *trans;
1826 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1827 struct inode *inode = NULL;
618e21d5
JB		 1828 int err;
1829 int drop_inode = 0;
1830 u64 objectid;
1832a6d5 1831 unsigned long nr = 0;
618e21d5
JB		 1832
1833 if (!new_valid_dev(rdev))
1834 return -EINVAL;
1835
1836 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1837 err = btrfs_check_free_space(root, 1, 0);
1838 if (err)
1839 goto fail;
1840
618e21d5
JB		 1841 trans = btrfs_start_transaction(root, 1);
1842 btrfs_set_trans_block_group(trans, dir);
1843
1844 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1845 if (err) {
1846 err = -ENOSPC;
1847 goto out_unlock;
1848 }
1849
9c58309d
CM		 1850 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1851 dentry->d_name.len,
1852 dentry->d_parent->d_inode->i_ino, objectid,
618e21d5
JB		 1853 BTRFS_I(dir)->block_group, mode);
1854 err = PTR_ERR(inode);
1855 if (IS_ERR(inode))
1856 goto out_unlock;
1857
1858 btrfs_set_trans_block_group(trans, inode);
9c58309d 1859 err = btrfs_add_nondir(trans, dentry, inode, 0);
618e21d5
JB		 1860 if (err)
1861 drop_inode = 1;
1862 else {
1863 inode->i_op = &btrfs_special_inode_operations;
1864 init_special_inode(inode, inode->i_mode, rdev);
1b4ab1bb 1865 btrfs_update_inode(trans, root, inode);
618e21d5
JB		 1866 }
1867 dir->i_sb->s_dirt = 1;
1868 btrfs_update_inode_block_group(trans, inode);
1869 btrfs_update_inode_block_group(trans, dir);
1870out_unlock:
d3c2fdcf 1871 nr = trans->blocks_used;
618e21d5 1872 btrfs_end_transaction(trans, root);
1832a6d5 1873fail:
618e21d5
JB		 1874 mutex_unlock(&root->fs_info->fs_mutex);
1875
1876 if (drop_inode) {
1877 inode_dec_link_count(inode);
1878 iput(inode);
1879 }
d3c2fdcf 1880 btrfs_btree_balance_dirty(root, nr);
e2008b61 1881 btrfs_throttle(root);
618e21d5
JB		 1882 return err;
1883}
1884
39279cc3
CM		 1885static int btrfs_create(struct inode *dir, struct dentry *dentry,
1886 int mode, struct nameidata *nd)
1887{
1888 struct btrfs_trans_handle *trans;
1889 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1890 struct inode *inode = NULL;
39279cc3
CM		 1891 int err;
1892 int drop_inode = 0;
1832a6d5 1893 unsigned long nr = 0;
39279cc3
CM		 1894 u64 objectid;
1895
1896 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1897 err = btrfs_check_free_space(root, 1, 0);
1898 if (err)
1899 goto fail;
39279cc3
CM		 1900 trans = btrfs_start_transaction(root, 1);
1901 btrfs_set_trans_block_group(trans, dir);
1902
1903 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1904 if (err) {
1905 err = -ENOSPC;
1906 goto out_unlock;
1907 }
1908
9c58309d
CM		 1909 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1910 dentry->d_name.len,
1911 dentry->d_parent->d_inode->i_ino,
1912 objectid, BTRFS_I(dir)->block_group, mode);
39279cc3
CM		 1913 err = PTR_ERR(inode);
1914 if (IS_ERR(inode))
1915 goto out_unlock;
1916
1917 btrfs_set_trans_block_group(trans, inode);
9c58309d 1918 err = btrfs_add_nondir(trans, dentry, inode, 0);
39279cc3
CM		 1919 if (err)
1920 drop_inode = 1;
1921 else {
1922 inode->i_mapping->a_ops = &btrfs_aops;
04160088 1923 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3
CM		 1924 inode->i_fop = &btrfs_file_operations;
1925 inode->i_op = &btrfs_file_inode_operations;
d1310b2e
CM		 1926 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1927 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
a52d9a80 1928 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 1929 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1930 inode->i_mapping, GFP_NOFS);
9069218d 1931 BTRFS_I(inode)->delalloc_bytes = 0;
d1310b2e 1932 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 1933 }
1934 dir->i_sb->s_dirt = 1;
1935 btrfs_update_inode_block_group(trans, inode);
1936 btrfs_update_inode_block_group(trans, dir);
1937out_unlock:
d3c2fdcf 1938 nr = trans->blocks_used;
39279cc3 1939 btrfs_end_transaction(trans, root);
1832a6d5 1940fail:
39279cc3
CM		 1941 mutex_unlock(&root->fs_info->fs_mutex);
1942
1943 if (drop_inode) {
1944 inode_dec_link_count(inode);
1945 iput(inode);
1946 }
d3c2fdcf 1947 btrfs_btree_balance_dirty(root, nr);
e2008b61 1948 btrfs_throttle(root);
39279cc3
CM		 1949 return err;
1950}
1951
1952static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1953 struct dentry *dentry)
1954{
1955 struct btrfs_trans_handle *trans;
1956 struct btrfs_root *root = BTRFS_I(dir)->root;
1957 struct inode *inode = old_dentry->d_inode;
1832a6d5 1958 unsigned long nr = 0;
39279cc3
CM		 1959 int err;
1960 int drop_inode = 0;
1961
1962 if (inode->i_nlink == 0)
1963 return -ENOENT;
1964
6da6abae
CM		 1965#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1966 inode->i_nlink++;
1967#else
39279cc3 1968 inc_nlink(inode);
6da6abae 1969#endif
39279cc3 1970 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1971 err = btrfs_check_free_space(root, 1, 0);
1972 if (err)
1973 goto fail;
39279cc3 1974 trans = btrfs_start_transaction(root, 1);
5f39d397 1975
39279cc3
CM		 1976 btrfs_set_trans_block_group(trans, dir);
1977 atomic_inc(&inode->i_count);
9c58309d 1978 err = btrfs_add_nondir(trans, dentry, inode, 1);
5f39d397 1979
39279cc3
CM		 1980 if (err)
1981 drop_inode = 1;
5f39d397 1982
39279cc3
CM		 1983 dir->i_sb->s_dirt = 1;
1984 btrfs_update_inode_block_group(trans, dir);
54aa1f4d 1985 err = btrfs_update_inode(trans, root, inode);
5f39d397 1986
54aa1f4d
CM		 1987 if (err)
1988 drop_inode = 1;
39279cc3 1989
d3c2fdcf 1990 nr = trans->blocks_used;
39279cc3 1991 btrfs_end_transaction(trans, root);
1832a6d5 1992fail:
39279cc3
CM		 1993 mutex_unlock(&root->fs_info->fs_mutex);
1994
1995 if (drop_inode) {
1996 inode_dec_link_count(inode);
1997 iput(inode);
1998 }
d3c2fdcf 1999 btrfs_btree_balance_dirty(root, nr);
e2008b61 2000 btrfs_throttle(root);
39279cc3
CM		 2001 return err;
2002}
2003
39279cc3
CM		 2004static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
2005{
2006 struct inode *inode;
2007 struct btrfs_trans_handle *trans;
2008 struct btrfs_root *root = BTRFS_I(dir)->root;
2009 int err = 0;
2010 int drop_on_err = 0;
2011 u64 objectid;
d3c2fdcf 2012 unsigned long nr = 1;
39279cc3
CM		 2013
2014 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2015 err = btrfs_check_free_space(root, 1, 0);
2016 if (err)
2017 goto out_unlock;
2018
39279cc3
CM		 2019 trans = btrfs_start_transaction(root, 1);
2020 btrfs_set_trans_block_group(trans, dir);
5f39d397 2021
39279cc3
CM		 2022 if (IS_ERR(trans)) {
2023 err = PTR_ERR(trans);
2024 goto out_unlock;
2025 }
2026
2027 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2028 if (err) {
2029 err = -ENOSPC;
2030 goto out_unlock;
2031 }
2032
9c58309d
CM		 2033 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
2034 dentry->d_name.len,
2035 dentry->d_parent->d_inode->i_ino, objectid,
39279cc3
CM		 2036 BTRFS_I(dir)->block_group, S_IFDIR | mode);
2037 if (IS_ERR(inode)) {
2038 err = PTR_ERR(inode);
2039 goto out_fail;
2040 }
5f39d397 2041
39279cc3
CM		 2042 drop_on_err = 1;
2043 inode->i_op = &btrfs_dir_inode_operations;
2044 inode->i_fop = &btrfs_dir_file_operations;
2045 btrfs_set_trans_block_group(trans, inode);
2046
3954401f 2047 inode->i_size = 0;
39279cc3
CM		 2048 err = btrfs_update_inode(trans, root, inode);
2049 if (err)
2050 goto out_fail;
5f39d397 2051
9c58309d 2052 err = btrfs_add_link(trans, dentry, inode, 0);
39279cc3
CM		 2053 if (err)
2054 goto out_fail;
5f39d397 2055
39279cc3
CM		 2056 d_instantiate(dentry, inode);
2057 drop_on_err = 0;
2058 dir->i_sb->s_dirt = 1;
2059 btrfs_update_inode_block_group(trans, inode);
2060 btrfs_update_inode_block_group(trans, dir);
2061
2062out_fail:
d3c2fdcf 2063 nr = trans->blocks_used;
39279cc3 2064 btrfs_end_transaction(trans, root);
5f39d397 2065
39279cc3
CM		 2066out_unlock:
2067 mutex_unlock(&root->fs_info->fs_mutex);
2068 if (drop_on_err)
2069 iput(inode);
d3c2fdcf 2070 btrfs_btree_balance_dirty(root, nr);
e2008b61 2071 btrfs_throttle(root);
39279cc3
CM		 2072 return err;
2073}
2074
a52d9a80 2075struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
70dec807 2076 size_t pg_offset, u64 start, u64 len,
a52d9a80
CM		 2077 int create)
2078{
2079 int ret;
2080 int err = 0;
db94535d 2081 u64 bytenr;
a52d9a80
CM		 2082 u64 extent_start = 0;
2083 u64 extent_end = 0;
2084 u64 objectid = inode->i_ino;
2085 u32 found_type;
a52d9a80
CM		 2086 struct btrfs_path *path;
2087 struct btrfs_root *root = BTRFS_I(inode)->root;
2088 struct btrfs_file_extent_item *item;
5f39d397
CM		 2089 struct extent_buffer *leaf;
2090 struct btrfs_key found_key;
a52d9a80
CM		 2091 struct extent_map *em = NULL;
2092 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
d1310b2e 2093 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
a52d9a80
CM		 2094 struct btrfs_trans_handle *trans = NULL;
2095
2096 path = btrfs_alloc_path();
2097 BUG_ON(!path);
2098 mutex_lock(&root->fs_info->fs_mutex);
2099
2100again:
d1310b2e
CM		 2101 spin_lock(&em_tree->lock);
2102 em = lookup_extent_mapping(em_tree, start, len);
2103 spin_unlock(&em_tree->lock);
2104
a52d9a80 2105 if (em) {
56b453c9 2106 if (em->start > start) {
d1310b2e
CM		 2107 printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n",
2108 start, len, em->start, em->len);
56b453c9
CM		 2109 WARN_ON(1);
2110 }
70dec807
CM		 2111 if (em->block_start == EXTENT_MAP_INLINE && page)
2112 free_extent_map(em);
2113 else
2114 goto out;
a52d9a80 2115 }
d1310b2e 2116 em = alloc_extent_map(GFP_NOFS);
a52d9a80 2117 if (!em) {
d1310b2e
CM		 2118 err = -ENOMEM;
2119 goto out;
a52d9a80 2120 }
d1310b2e
CM		 2121
2122 em->start = EXTENT_MAP_HOLE;
2123 em->len = (u64)-1;
a52d9a80 2124 em->bdev = inode->i_sb->s_bdev;
179e29e4
CM		 2125 ret = btrfs_lookup_file_extent(trans, root, path,
2126 objectid, start, trans != NULL);
a52d9a80
CM		 2127 if (ret < 0) {
2128 err = ret;
2129 goto out;
2130 }
2131
2132 if (ret != 0) {
2133 if (path->slots[0] == 0)
2134 goto not_found;
2135 path->slots[0]--;
2136 }
2137
5f39d397
CM		 2138 leaf = path->nodes[0];
2139 item = btrfs_item_ptr(leaf, path->slots[0],
a52d9a80 2140 struct btrfs_file_extent_item);
a52d9a80 2141 /* are we inside the extent that was found? */
5f39d397
CM		 2142 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2143 found_type = btrfs_key_type(&found_key);
2144 if (found_key.objectid != objectid ||
a52d9a80
CM		 2145 found_type != BTRFS_EXTENT_DATA_KEY) {
2146 goto not_found;
2147 }
2148
5f39d397
CM		 2149 found_type = btrfs_file_extent_type(leaf, item);
2150 extent_start = found_key.offset;
a52d9a80
CM		 2151 if (found_type == BTRFS_FILE_EXTENT_REG) {
2152 extent_end = extent_start +
db94535d 2153 btrfs_file_extent_num_bytes(leaf, item);
a52d9a80 2154 err = 0;
b888db2b 2155 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 2156 em->start = start;
2157 if (start < extent_start) {
d1310b2e 2158 if (start + len <= extent_start)
b888db2b 2159 goto not_found;
d1310b2e 2160 em->len = extent_end - extent_start;
a52d9a80 2161 } else {
d1310b2e 2162 em->len = len;
a52d9a80
CM		 2163 }
2164 goto not_found_em;
2165 }
db94535d
CM		 2166 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
2167 if (bytenr == 0) {
a52d9a80 2168 em->start = extent_start;
d1310b2e 2169 em->len = extent_end - extent_start;
5f39d397 2170 em->block_start = EXTENT_MAP_HOLE;
a52d9a80
CM		 2171 goto insert;
2172 }
db94535d
CM		 2173 bytenr += btrfs_file_extent_offset(leaf, item);
2174 em->block_start = bytenr;
a52d9a80 2175 em->start = extent_start;
d1310b2e 2176 em->len = extent_end - extent_start;
a52d9a80
CM		 2177 goto insert;
2178 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
70dec807 2179 u64 page_start;
5f39d397 2180 unsigned long ptr;
a52d9a80 2181 char *map;
3326d1b0
CM		 2182 size_t size;
2183 size_t extent_offset;
2184 size_t copy_size;
a52d9a80 2185
5f39d397
CM		 2186 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
2187 path->slots[0]));
d1310b2e
CM		 2188 extent_end = (extent_start + size + root->sectorsize - 1) &
2189 ~((u64)root->sectorsize - 1);
b888db2b 2190 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 2191 em->start = start;
2192 if (start < extent_start) {
d1310b2e 2193 if (start + len <= extent_start)
b888db2b 2194 goto not_found;
d1310b2e 2195 em->len = extent_end - extent_start;
a52d9a80 2196 } else {
d1310b2e 2197 em->len = len;
a52d9a80
CM		 2198 }
2199 goto not_found_em;
2200 }
689f9346 2201 em->block_start = EXTENT_MAP_INLINE;
689f9346
Y		 2202
2203 if (!page) {
2204 em->start = extent_start;
d1310b2e 2205 em->len = size;
689f9346
Y		 2206 goto out;
2207 }
5f39d397 2208
70dec807
CM		 2209 page_start = page_offset(page) + pg_offset;
2210 extent_offset = page_start - extent_start;
2211 copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
3326d1b0 2212 size - extent_offset);
3326d1b0 2213 em->start = extent_start + extent_offset;
70dec807
CM		 2214 em->len = (copy_size + root->sectorsize - 1) &
2215 ~((u64)root->sectorsize - 1);
689f9346
Y		 2216 map = kmap(page);
2217 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
179e29e4 2218 if (create == 0 && !PageUptodate(page)) {
70dec807 2219 read_extent_buffer(leaf, map + pg_offset, ptr,
179e29e4
CM		 2220 copy_size);
2221 flush_dcache_page(page);
2222 } else if (create && PageUptodate(page)) {
2223 if (!trans) {
2224 kunmap(page);
2225 free_extent_map(em);
2226 em = NULL;
2227 btrfs_release_path(root, path);
2228 trans = btrfs_start_transaction(root, 1);
2229 goto again;
2230 }
70dec807 2231 write_extent_buffer(leaf, map + pg_offset, ptr,
179e29e4
CM		 2232 copy_size);
2233 btrfs_mark_buffer_dirty(leaf);
a52d9a80 2234 }
a52d9a80 2235 kunmap(page);
d1310b2e
CM		 2236 set_extent_uptodate(io_tree, em->start,
2237 extent_map_end(em) - 1, GFP_NOFS);
a52d9a80
CM		 2238 goto insert;
2239 } else {
2240 printk("unkknown found_type %d\n", found_type);
2241 WARN_ON(1);
2242 }
2243not_found:
2244 em->start = start;
d1310b2e 2245 em->len = len;
a52d9a80 2246not_found_em:
5f39d397 2247 em->block_start = EXTENT_MAP_HOLE;
a52d9a80
CM		 2248insert:
2249 btrfs_release_path(root, path);
d1310b2e
CM		 2250 if (em->start > start || extent_map_end(em) <= start) {
2251 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len);
a52d9a80
CM		 2252 err = -EIO;
2253 goto out;
2254 }
d1310b2e
CM		 2255
2256 err = 0;
2257 spin_lock(&em_tree->lock);
a52d9a80
CM		 2258 ret = add_extent_mapping(em_tree, em);
2259 if (ret == -EEXIST) {
2260 free_extent_map(em);
d1310b2e
CM		 2261 em = lookup_extent_mapping(em_tree, start, len);
2262 if (!em) {
a52d9a80 2263 err = -EIO;
d1310b2e 2264 printk("failing to insert %Lu %Lu\n", start, len);
a52d9a80 2265 }
a52d9a80 2266 }
d1310b2e 2267 spin_unlock(&em_tree->lock);
a52d9a80
CM		 2268out:
2269 btrfs_free_path(path);
2270 if (trans) {
2271 ret = btrfs_end_transaction(trans, root);
2272 if (!err)
2273 err = ret;
2274 }
2275 mutex_unlock(&root->fs_info->fs_mutex);
2276 if (err) {
2277 free_extent_map(em);
2278 WARN_ON(1);
2279 return ERR_PTR(err);
2280 }
2281 return em;
2282}
2283
16432985
CM		 2284static int btrfs_get_block(struct inode *inode, sector_t iblock,
2285 struct buffer_head *bh_result, int create)
2286{
2287 struct extent_map *em;
2288 u64 start = (u64)iblock << inode->i_blkbits;
2289 struct btrfs_multi_bio *multi = NULL;
2290 struct btrfs_root *root = BTRFS_I(inode)->root;
2291 u64 len;
2292 u64 logical;
2293 u64 map_length;
2294 int ret = 0;
2295
2296 em = btrfs_get_extent(inode, NULL, 0, start, bh_result->b_size, 0);
2297
2298 if (!em || IS_ERR(em))
2299 goto out;
2300
2301 if (em->start > start || em->start + em->len <= start)
2302 goto out;
2303
2304 if (em->block_start == EXTENT_MAP_INLINE) {
2305 ret = -EINVAL;
2306 goto out;
2307 }
2308
2309 if (em->block_start == EXTENT_MAP_HOLE ||
2310 em->block_start == EXTENT_MAP_DELALLOC) {
2311 goto out;
2312 }
2313
2314 len = em->start + em->len - start;
2315 len = min_t(u64, len, INT_LIMIT(typeof(bh_result->b_size)));
2316
2317 logical = start - em->start;
2318 logical = em->block_start + logical;
2319
2320 map_length = len;
2321 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
2322 logical, &map_length, &multi, 0);
2323 BUG_ON(ret);
2324 bh_result->b_blocknr = multi->stripes[0].physical >> inode->i_blkbits;
2325 bh_result->b_size = min(map_length, len);
2326 bh_result->b_bdev = multi->stripes[0].dev->bdev;
2327 set_buffer_mapped(bh_result);
2328 kfree(multi);
2329out:
2330 free_extent_map(em);
2331 return ret;
2332}
2333
2334static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
2335 const struct iovec *iov, loff_t offset,
2336 unsigned long nr_segs)
2337{
2338 struct file *file = iocb->ki_filp;
2339 struct inode *inode = file->f_mapping->host;
2340
2341 if (rw == WRITE)
2342 return -EINVAL;
2343
2344 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
2345 offset, nr_segs, btrfs_get_block, NULL);
2346}
2347
d396c6f5 2348static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
39279cc3 2349{
d396c6f5 2350 return extent_bmap(mapping, iblock, btrfs_get_extent);
39279cc3
CM		 2351}
2352
a52d9a80 2353int btrfs_readpage(struct file *file, struct page *page)
9ebefb18 2354{
d1310b2e
CM		 2355 struct extent_io_tree *tree;
2356 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80 2357 return extent_read_full_page(tree, page, btrfs_get_extent);
9ebefb18 2358}
1832a6d5 2359
a52d9a80 2360static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
39279cc3 2361{
d1310b2e 2362 struct extent_io_tree *tree;
b888db2b
CM		 2363
2364
2365 if (current->flags & PF_MEMALLOC) {
2366 redirty_page_for_writepage(wbc, page);
2367 unlock_page(page);
2368 return 0;
2369 }
d1310b2e 2370 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80 2371 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
9ebefb18
CM		 2372}
2373
b293f02e
CM		 2374static int btrfs_writepages(struct address_space *mapping,
2375 struct writeback_control *wbc)
2376{
d1310b2e
CM		 2377 struct extent_io_tree *tree;
2378 tree = &BTRFS_I(mapping->host)->io_tree;
b293f02e
CM		 2379 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2380}
2381
3ab2fb5a
CM		 2382static int
2383btrfs_readpages(struct file *file, struct address_space *mapping,
2384 struct list_head *pages, unsigned nr_pages)
2385{
d1310b2e
CM		 2386 struct extent_io_tree *tree;
2387 tree = &BTRFS_I(mapping->host)->io_tree;
3ab2fb5a
CM		 2388 return extent_readpages(tree, mapping, pages, nr_pages,
2389 btrfs_get_extent);
2390}
2391
70dec807 2392static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
9ebefb18 2393{
d1310b2e
CM		 2394 struct extent_io_tree *tree;
2395 struct extent_map_tree *map;
a52d9a80 2396 int ret;
8c2383c3 2397
d1310b2e
CM		 2398 tree = &BTRFS_I(page->mapping->host)->io_tree;
2399 map = &BTRFS_I(page->mapping->host)->extent_tree;
70dec807 2400 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
a52d9a80
CM		 2401 if (ret == 1) {
2402 ClearPagePrivate(page);
2403 set_page_private(page, 0);
2404 page_cache_release(page);
39279cc3 2405 }
a52d9a80 2406 return ret;
39279cc3
CM		 2407}
2408
a52d9a80 2409static void btrfs_invalidatepage(struct page *page, unsigned long offset)
39279cc3 2410{
d1310b2e 2411 struct extent_io_tree *tree;
39279cc3 2412
d1310b2e 2413 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80
CM		 2414 extent_invalidatepage(tree, page, offset);
2415 btrfs_releasepage(page, GFP_NOFS);
39279cc3
CM		 2416}
2417
9ebefb18
CM		 2418/*
2419 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2420 * called from a page fault handler when a page is first dirtied. Hence we must
2421 * be careful to check for EOF conditions here. We set the page up correctly
2422 * for a written page which means we get ENOSPC checking when writing into
2423 * holes and correct delalloc and unwritten extent mapping on filesystems that
2424 * support these features.
2425 *
2426 * We are not allowed to take the i_mutex here so we have to play games to
2427 * protect against truncate races as the page could now be beyond EOF. Because
2428 * vmtruncate() writes the inode size before removing pages, once we have the
2429 * page lock we can determine safely if the page is beyond EOF. If it is not
2430 * beyond EOF, then the page is guaranteed safe against truncation until we
2431 * unlock the page.
2432 */
2433int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2434{
6da6abae 2435 struct inode *inode = fdentry(vma->vm_file)->d_inode;
1832a6d5 2436 struct btrfs_root *root = BTRFS_I(inode)->root;
9ebefb18
CM		 2437 unsigned long end;
2438 loff_t size;
1832a6d5 2439 int ret;
a52d9a80 2440 u64 page_start;
9ebefb18 2441
1832a6d5
CM		 2442 mutex_lock(&root->fs_info->fs_mutex);
2443 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
8f662a76 2444 mutex_unlock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2445 if (ret)
2446 goto out;
2447
2448 ret = -EINVAL;
2449
9ebefb18
CM		 2450 lock_page(page);
2451 wait_on_page_writeback(page);
9ebefb18 2452 size = i_size_read(inode);
35ebb934 2453 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 2454
9ebefb18 2455 if ((page->mapping != inode->i_mapping) ||
a52d9a80 2456 (page_start > size)) {
9ebefb18
CM		 2457 /* page got truncated out from underneath us */
2458 goto out_unlock;
2459 }
2460
2461 /* page is wholly or partially inside EOF */
a52d9a80 2462 if (page_start + PAGE_CACHE_SIZE > size)
9ebefb18
CM		 2463 end = size & ~PAGE_CACHE_MASK;
2464 else
2465 end = PAGE_CACHE_SIZE;
2466
b888db2b 2467 ret = btrfs_cow_one_page(inode, page, end);
9ebefb18
CM		 2468
2469out_unlock:
2470 unlock_page(page);
1832a6d5 2471out:
9ebefb18
CM		 2472 return ret;
2473}
2474
39279cc3
CM		 2475static void btrfs_truncate(struct inode *inode)
2476{
2477 struct btrfs_root *root = BTRFS_I(inode)->root;
2478 int ret;
2479 struct btrfs_trans_handle *trans;
d3c2fdcf 2480 unsigned long nr;
39279cc3
CM		 2481
2482 if (!S_ISREG(inode->i_mode))
2483 return;
2484 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2485 return;
2486
2487 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2488
2489 mutex_lock(&root->fs_info->fs_mutex);
2490 trans = btrfs_start_transaction(root, 1);
2491 btrfs_set_trans_block_group(trans, inode);
2492
2493 /* FIXME, add redo link to tree so we don't leak on crash */
85e21bac
CM		 2494 ret = btrfs_truncate_in_trans(trans, root, inode,
2495 BTRFS_EXTENT_DATA_KEY);
39279cc3 2496 btrfs_update_inode(trans, root, inode);
d3c2fdcf 2497 nr = trans->blocks_used;
5f39d397 2498
39279cc3
CM		 2499 ret = btrfs_end_transaction(trans, root);
2500 BUG_ON(ret);
2501 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2502 btrfs_btree_balance_dirty(root, nr);
e2008b61 2503 btrfs_throttle(root);
39279cc3
CM		 2504}
2505
4313b399
CM		 2506static int noinline create_subvol(struct btrfs_root *root, char *name,
2507 int namelen)
39279cc3
CM		 2508{
2509 struct btrfs_trans_handle *trans;
2510 struct btrfs_key key;
2511 struct btrfs_root_item root_item;
2512 struct btrfs_inode_item *inode_item;
5f39d397 2513 struct extent_buffer *leaf;
dc17ff8f 2514 struct btrfs_root *new_root = root;
39279cc3
CM		 2515 struct inode *inode;
2516 struct inode *dir;
2517 int ret;
54aa1f4d 2518 int err;
39279cc3
CM		 2519 u64 objectid;
2520 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
d3c2fdcf 2521 unsigned long nr = 1;
39279cc3
CM		 2522
2523 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2524 ret = btrfs_check_free_space(root, 1, 0);
2525 if (ret)
2526 goto fail_commit;
2527
39279cc3
CM		 2528 trans = btrfs_start_transaction(root, 1);
2529 BUG_ON(!trans);
2530
7bb86316
CM		 2531 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2532 0, &objectid);
2533 if (ret)
2534 goto fail;
2535
2536 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2537 objectid, trans->transid, 0, 0,
2538 0, 0);
5f39d397
CM		 2539 if (IS_ERR(leaf))
2540 return PTR_ERR(leaf);
2541
2542 btrfs_set_header_nritems(leaf, 0);
2543 btrfs_set_header_level(leaf, 0);
db94535d 2544 btrfs_set_header_bytenr(leaf, leaf->start);
5f39d397 2545 btrfs_set_header_generation(leaf, trans->transid);
7bb86316
CM		 2546 btrfs_set_header_owner(leaf, objectid);
2547
5f39d397
CM		 2548 write_extent_buffer(leaf, root->fs_info->fsid,
2549 (unsigned long)btrfs_header_fsid(leaf),
2550 BTRFS_FSID_SIZE);
2551 btrfs_mark_buffer_dirty(leaf);
39279cc3
CM		 2552
2553 inode_item = &root_item.inode;
2554 memset(inode_item, 0, sizeof(*inode_item));
5f39d397
CM		 2555 inode_item->generation = cpu_to_le64(1);
2556 inode_item->size = cpu_to_le64(3);
2557 inode_item->nlink = cpu_to_le32(1);
2558 inode_item->nblocks = cpu_to_le64(1);
2559 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
39279cc3 2560
db94535d
CM		 2561 btrfs_set_root_bytenr(&root_item, leaf->start);
2562 btrfs_set_root_level(&root_item, 0);
39279cc3 2563 btrfs_set_root_refs(&root_item, 1);
5f39d397
CM		 2564 btrfs_set_root_used(&root_item, 0);
2565
5eda7b5e
CM		 2566 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2567 root_item.drop_level = 0;
5f39d397
CM		 2568
2569 free_extent_buffer(leaf);
2570 leaf = NULL;
39279cc3 2571
39279cc3
CM		 2572 btrfs_set_root_dirid(&root_item, new_dirid);
2573
2574 key.objectid = objectid;
2575 key.offset = 1;
39279cc3
CM		 2576 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2577 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2578 &root_item);
54aa1f4d
CM		 2579 if (ret)
2580 goto fail;
39279cc3
CM		 2581
2582 /*
2583 * insert the directory item
2584 */
2585 key.offset = (u64)-1;
2586 dir = root->fs_info->sb->s_root->d_inode;
2587 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2588 name, namelen, dir->i_ino, &key,
2589 BTRFS_FT_DIR);
54aa1f4d
CM		 2590 if (ret)
2591 goto fail;
39279cc3 2592
3954401f
CM		 2593 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2594 name, namelen, objectid,
2595 root->fs_info->sb->s_root->d_inode->i_ino);
2596 if (ret)
2597 goto fail;
2598
39279cc3 2599 ret = btrfs_commit_transaction(trans, root);
54aa1f4d
CM		 2600 if (ret)
2601 goto fail_commit;
39279cc3 2602
58176a96 2603 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
39279cc3
CM		 2604 BUG_ON(!new_root);
2605
2606 trans = btrfs_start_transaction(new_root, 1);
2607 BUG_ON(!trans);
2608
9c58309d
CM		 2609 inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid,
2610 new_dirid,
39279cc3 2611 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
54aa1f4d
CM		 2612 if (IS_ERR(inode))
2613 goto fail;
39279cc3
CM		 2614 inode->i_op = &btrfs_dir_inode_operations;
2615 inode->i_fop = &btrfs_dir_file_operations;
34088780 2616 new_root->inode = inode;
39279cc3 2617
3954401f
CM		 2618 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2619 new_dirid);
39279cc3 2620 inode->i_nlink = 1;
3954401f 2621 inode->i_size = 0;
39279cc3 2622 ret = btrfs_update_inode(trans, new_root, inode);
54aa1f4d
CM		 2623 if (ret)
2624 goto fail;
2625fail:
d3c2fdcf 2626 nr = trans->blocks_used;
dc17ff8f 2627 err = btrfs_commit_transaction(trans, new_root);
54aa1f4d
CM		 2628 if (err && !ret)
2629 ret = err;
2630fail_commit:
39279cc3 2631 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2632 btrfs_btree_balance_dirty(root, nr);
e2008b61 2633 btrfs_throttle(root);
54aa1f4d 2634 return ret;
39279cc3
CM		 2635}
2636
2637static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2638{
3063d29f 2639 struct btrfs_pending_snapshot *pending_snapshot;
39279cc3 2640 struct btrfs_trans_handle *trans;
39279cc3 2641 int ret;
54aa1f4d 2642 int err;
1832a6d5 2643 unsigned long nr = 0;
39279cc3
CM		 2644
2645 if (!root->ref_cows)
2646 return -EINVAL;
2647
2648 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2649 ret = btrfs_check_free_space(root, 1, 0);
2650 if (ret)
2651 goto fail_unlock;
2652
3063d29f
CM		 2653 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
2654 if (!pending_snapshot) {
2655 ret = -ENOMEM;
2656 goto fail_unlock;
2657 }
fb4bc1e0 2658 pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
3063d29f
CM		 2659 if (!pending_snapshot->name) {
2660 ret = -ENOMEM;
2661 kfree(pending_snapshot);
2662 goto fail_unlock;
2663 }
fb4bc1e0
Y		 2664 memcpy(pending_snapshot->name, name, namelen);
2665 pending_snapshot->name[namelen] = '\0';
39279cc3
CM		 2666 trans = btrfs_start_transaction(root, 1);
2667 BUG_ON(!trans);
3063d29f
CM		 2668 pending_snapshot->root = root;
2669 list_add(&pending_snapshot->list,
2670 &trans->transaction->pending_snapshots);
39279cc3 2671 ret = btrfs_update_inode(trans, root, root->inode);
54aa1f4d 2672 err = btrfs_commit_transaction(trans, root);
5f39d397 2673
1832a6d5 2674fail_unlock:
39279cc3 2675 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2676 btrfs_btree_balance_dirty(root, nr);
e2008b61 2677 btrfs_throttle(root);
54aa1f4d 2678 return ret;
39279cc3
CM		 2679}
2680
edbd8d4e 2681unsigned long btrfs_force_ra(struct address_space *mapping,
86479a04
CM		 2682 struct file_ra_state *ra, struct file *file,
2683 pgoff_t offset, pgoff_t last_index)
2684{
2685 pgoff_t req_size;
2686
2687#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2688 req_size = last_index - offset + 1;
2689 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2690 return offset;
2691#else
2692 req_size = min(last_index - offset + 1, (pgoff_t)128);
2693 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2694 return offset + req_size;
2695#endif
2696}
2697
2698int btrfs_defrag_file(struct file *file) {
6da6abae 2699 struct inode *inode = fdentry(file)->d_inode;
1832a6d5 2700 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 2701 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
86479a04
CM		 2702 struct page *page;
2703 unsigned long last_index;
2704 unsigned long ra_index = 0;
2705 u64 page_start;
2706 u64 page_end;
2707 unsigned long i;
1832a6d5
CM		 2708 int ret;
2709
2710 mutex_lock(&root->fs_info->fs_mutex);
2711 ret = btrfs_check_free_space(root, inode->i_size, 0);
2712 mutex_unlock(&root->fs_info->fs_mutex);
2713 if (ret)
2714 return -ENOSPC;
86479a04
CM		 2715
2716 mutex_lock(&inode->i_mutex);
2717 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2718 for (i = 0; i <= last_index; i++) {
2719 if (i == ra_index) {
edbd8d4e
CM		 2720 ra_index = btrfs_force_ra(inode->i_mapping,
2721 &file->f_ra,
2722 file, ra_index, last_index);
86479a04
CM		 2723 }
2724 page = grab_cache_page(inode->i_mapping, i);
2725 if (!page)
2726 goto out_unlock;
2727 if (!PageUptodate(page)) {
2728 btrfs_readpage(NULL, page);
2729 lock_page(page);
2730 if (!PageUptodate(page)) {
2731 unlock_page(page);
2732 page_cache_release(page);
2733 goto out_unlock;
2734 }
2735 }
35ebb934 2736 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
86479a04
CM		 2737 page_end = page_start + PAGE_CACHE_SIZE - 1;
2738
d1310b2e 2739 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
d1310b2e 2740 set_extent_delalloc(io_tree, page_start,
86479a04 2741 page_end, GFP_NOFS);
edbd8d4e 2742
d1310b2e 2743 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
86479a04
CM		 2744 set_page_dirty(page);
2745 unlock_page(page);
2746 page_cache_release(page);
2747 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2748 }
2749
2750out_unlock:
2751 mutex_unlock(&inode->i_mutex);
2752 return 0;
2753}
2754
edbd8d4e
CM		 2755static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2756{
2757 u64 new_size;
2758 u64 old_size;
2759 struct btrfs_ioctl_vol_args *vol_args;
2760 struct btrfs_trans_handle *trans;
2761 char *sizestr;
2762 int ret = 0;
2763 int namelen;
2764 int mod = 0;
2765
2766 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2767
2768 if (!vol_args)
2769 return -ENOMEM;
2770
2771 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2772 ret = -EFAULT;
2773 goto out;
2774 }
2775 namelen = strlen(vol_args->name);
2776 if (namelen > BTRFS_VOL_NAME_MAX) {
2777 ret = -EINVAL;
2778 goto out;
2779 }
2780
2781 sizestr = vol_args->name;
2782 if (!strcmp(sizestr, "max"))
2783 new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
2784 else {
2785 if (sizestr[0] == '-') {
2786 mod = -1;
2787 sizestr++;
2788 } else if (sizestr[0] == '+') {
2789 mod = 1;
2790 sizestr++;
2791 }
2792 new_size = btrfs_parse_size(sizestr);
2793 if (new_size == 0) {
2794 ret = -EINVAL;
2795 goto out;
2796 }
2797 }
2798
2799 mutex_lock(&root->fs_info->fs_mutex);
2800 old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);
2801
2802 if (mod < 0) {
2803 if (new_size > old_size) {
2804 ret = -EINVAL;
2805 goto out_unlock;
2806 }
2807 new_size = old_size - new_size;
2808 } else if (mod > 0) {
2809 new_size = old_size + new_size;
2810 }
2811
2812 if (new_size < 256 * 1024 * 1024) {
2813 ret = -EINVAL;
2814 goto out_unlock;
2815 }
2816 if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
2817 ret = -EFBIG;
2818 goto out_unlock;
2819 }
f9ef6604
CM		 2820
2821 do_div(new_size, root->sectorsize);
2822 new_size *= root->sectorsize;
edbd8d4e
CM		 2823
2824printk("new size is %Lu\n", new_size);
2825 if (new_size > old_size) {
2826 trans = btrfs_start_transaction(root, 1);
2827 ret = btrfs_grow_extent_tree(trans, root, new_size);
2828 btrfs_commit_transaction(trans, root);
2829 } else {
2830 ret = btrfs_shrink_extent_tree(root, new_size);
2831 }
2832
2833out_unlock:
2834 mutex_unlock(&root->fs_info->fs_mutex);
2835out:
2836 kfree(vol_args);
2837 return ret;
2838}
2839
4313b399
CM		 2840static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
2841 void __user *arg)
39279cc3 2842{
4aec2b52 2843 struct btrfs_ioctl_vol_args *vol_args;
39279cc3 2844 struct btrfs_dir_item *di;
39279cc3
CM		 2845 struct btrfs_path *path;
2846 u64 root_dirid;
4aec2b52
CM		 2847 int namelen;
2848 int ret;
39279cc3 2849
4aec2b52 2850 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
5f39d397 2851
4aec2b52
CM		 2852 if (!vol_args)
2853 return -ENOMEM;
2854
2855 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2856 ret = -EFAULT;
2857 goto out;
2858 }
2859
2860 namelen = strlen(vol_args->name);
2861 if (namelen > BTRFS_VOL_NAME_MAX) {
2862 ret = -EINVAL;
2863 goto out;
2864 }
2865 if (strchr(vol_args->name, '/')) {
2866 ret = -EINVAL;
2867 goto out;
2868 }
d03581f4
CH		 2869
2870 path = btrfs_alloc_path();
4aec2b52
CM		 2871 if (!path) {
2872 ret = -ENOMEM;
2873 goto out;
2874 }
d03581f4
CH		 2875
2876 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2877 mutex_lock(&root->fs_info->fs_mutex);
2878 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2879 path, root_dirid,
4aec2b52 2880 vol_args->name, namelen, 0);
d03581f4
CH		 2881 mutex_unlock(&root->fs_info->fs_mutex);
2882 btrfs_free_path(path);
4aec2b52
CM		 2883
2884 if (di && !IS_ERR(di)) {
2885 ret = -EEXIST;
2886 goto out;
2887 }
2888
2889 if (IS_ERR(di)) {
2890 ret = PTR_ERR(di);
2891 goto out;
2892 }
d03581f4
CH		 2893
2894 if (root == root->fs_info->tree_root)
4aec2b52
CM		 2895 ret = create_subvol(root, vol_args->name, namelen);
2896 else
2897 ret = create_snapshot(root, vol_args->name, namelen);
2898out:
2899 kfree(vol_args);
2900 return ret;
d03581f4
CH		 2901}
2902
2903static int btrfs_ioctl_defrag(struct file *file)
2904{
6da6abae 2905 struct inode *inode = fdentry(file)->d_inode;
d03581f4
CH		 2906 struct btrfs_root *root = BTRFS_I(inode)->root;
2907
2908 switch (inode->i_mode & S_IFMT) {
2909 case S_IFDIR:
39279cc3 2910 mutex_lock(&root->fs_info->fs_mutex);
d03581f4
CH		 2911 btrfs_defrag_root(root, 0);
2912 btrfs_defrag_root(root->fs_info->extent_root, 0);
39279cc3 2913 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3 2914 break;
d03581f4
CH		 2915 case S_IFREG:
2916 btrfs_defrag_file(file);
2917 break;
2918 }
2919
2920 return 0;
2921}
6702ed49 2922
d03581f4
CH		 2923long btrfs_ioctl(struct file *file, unsigned int
2924 cmd, unsigned long arg)
2925{
6da6abae 2926 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
d03581f4
CH		 2927
2928 switch (cmd) {
2929 case BTRFS_IOC_SNAP_CREATE:
2930 return btrfs_ioctl_snap_create(root, (void __user *)arg);
6702ed49 2931 case BTRFS_IOC_DEFRAG:
d03581f4 2932 return btrfs_ioctl_defrag(file);
edbd8d4e
CM		 2933 case BTRFS_IOC_RESIZE:
2934 return btrfs_ioctl_resize(root, (void __user *)arg);
39279cc3 2935 }
d03581f4
CH		 2936
2937 return -ENOTTY;
39279cc3
CM		 2938}
2939
39279cc3
CM		 2940/*
2941 * Called inside transaction, so use GFP_NOFS
2942 */
2943struct inode *btrfs_alloc_inode(struct super_block *sb)
2944{
2945 struct btrfs_inode *ei;
2946
2947 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2948 if (!ei)
2949 return NULL;
15ee9bc7 2950 ei->last_trans = 0;
dc17ff8f 2951 ei->ordered_trans = 0;
39279cc3
CM		 2952 return &ei->vfs_inode;
2953}
2954
2955void btrfs_destroy_inode(struct inode *inode)
2956{
2957 WARN_ON(!list_empty(&inode->i_dentry));
2958 WARN_ON(inode->i_data.nrpages);
2959
8c416c9e 2960 btrfs_drop_extent_cache(inode, 0, (u64)-1);
39279cc3
CM		 2961 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2962}
2963
44ec0b71
CM		 2964#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2965static void init_once(struct kmem_cache * cachep, void *foo)
2966#else
39279cc3
CM		 2967static void init_once(void * foo, struct kmem_cache * cachep,
2968 unsigned long flags)
44ec0b71 2969#endif
39279cc3
CM		 2970{
2971 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2972
2973 inode_init_once(&ei->vfs_inode);
2974}
2975
2976void btrfs_destroy_cachep(void)
2977{
2978 if (btrfs_inode_cachep)
2979 kmem_cache_destroy(btrfs_inode_cachep);
2980 if (btrfs_trans_handle_cachep)
2981 kmem_cache_destroy(btrfs_trans_handle_cachep);
2982 if (btrfs_transaction_cachep)
2983 kmem_cache_destroy(btrfs_transaction_cachep);
2984 if (btrfs_bit_radix_cachep)
2985 kmem_cache_destroy(btrfs_bit_radix_cachep);
2986 if (btrfs_path_cachep)
2987 kmem_cache_destroy(btrfs_path_cachep);
2988}
2989
86479a04 2990struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
92fee66d 2991 unsigned long extra_flags,
44ec0b71
CM		 2992#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2993 void (*ctor)(struct kmem_cache *, void *)
2994#else
92fee66d 2995 void (*ctor)(void *, struct kmem_cache *,
44ec0b71
CM		 2996 unsigned long)
2997#endif
2998 )
92fee66d
CM		 2999{
3000 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
3001 SLAB_MEM_SPREAD | extra_flags), ctor
3002#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
3003 ,NULL
3004#endif
3005 );
3006}
3007
39279cc3
CM		 3008int btrfs_init_cachep(void)
3009{
86479a04 3010 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
92fee66d
CM		 3011 sizeof(struct btrfs_inode),
3012 0, init_once);
39279cc3
CM		 3013 if (!btrfs_inode_cachep)
3014 goto fail;
86479a04
CM		 3015 btrfs_trans_handle_cachep =
3016 btrfs_cache_create("btrfs_trans_handle_cache",
3017 sizeof(struct btrfs_trans_handle),
3018 0, NULL);
39279cc3
CM		 3019 if (!btrfs_trans_handle_cachep)
3020 goto fail;
86479a04 3021 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
39279cc3 3022 sizeof(struct btrfs_transaction),
92fee66d 3023 0, NULL);
39279cc3
CM		 3024 if (!btrfs_transaction_cachep)
3025 goto fail;
86479a04 3026 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
23223584 3027 sizeof(struct btrfs_path),
92fee66d 3028 0, NULL);
39279cc3
CM		 3029 if (!btrfs_path_cachep)
3030 goto fail;
86479a04 3031 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
92fee66d 3032 SLAB_DESTROY_BY_RCU, NULL);
39279cc3
CM		 3033 if (!btrfs_bit_radix_cachep)
3034 goto fail;
3035 return 0;
3036fail:
3037 btrfs_destroy_cachep();
3038 return -ENOMEM;
3039}
3040
3041static int btrfs_getattr(struct vfsmount *mnt,
3042 struct dentry *dentry, struct kstat *stat)
3043{
3044 struct inode *inode = dentry->d_inode;
3045 generic_fillattr(inode, stat);
d6667462 3046 stat->blksize = PAGE_CACHE_SIZE;
9069218d 3047 stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9);
39279cc3
CM		 3048 return 0;
3049}
3050
3051static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
3052 struct inode * new_dir,struct dentry *new_dentry)
3053{
3054 struct btrfs_trans_handle *trans;
3055 struct btrfs_root *root = BTRFS_I(old_dir)->root;
3056 struct inode *new_inode = new_dentry->d_inode;
3057 struct inode *old_inode = old_dentry->d_inode;
3058 struct timespec ctime = CURRENT_TIME;
3059 struct btrfs_path *path;
39279cc3
CM		 3060 int ret;
3061
3062 if (S_ISDIR(old_inode->i_mode) && new_inode &&
3063 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
3064 return -ENOTEMPTY;
3065 }
5f39d397 3066
39279cc3 3067 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 3068 ret = btrfs_check_free_space(root, 1, 0);
3069 if (ret)
3070 goto out_unlock;
3071
39279cc3 3072 trans = btrfs_start_transaction(root, 1);
5f39d397 3073
39279cc3
CM		 3074 btrfs_set_trans_block_group(trans, new_dir);
3075 path = btrfs_alloc_path();
3076 if (!path) {
3077 ret = -ENOMEM;
3078 goto out_fail;
3079 }
3080
3081 old_dentry->d_inode->i_nlink++;
3082 old_dir->i_ctime = old_dir->i_mtime = ctime;
3083 new_dir->i_ctime = new_dir->i_mtime = ctime;
3084 old_inode->i_ctime = ctime;
5f39d397 3085
39279cc3
CM		 3086 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
3087 if (ret)
3088 goto out_fail;
3089
3090 if (new_inode) {
3091 new_inode->i_ctime = CURRENT_TIME;
3092 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
3093 if (ret)
3094 goto out_fail;
39279cc3 3095 }
9c58309d 3096 ret = btrfs_add_link(trans, new_dentry, old_inode, 1);
39279cc3
CM		 3097 if (ret)
3098 goto out_fail;
3099
3100out_fail:
3101 btrfs_free_path(path);
3102 btrfs_end_transaction(trans, root);
1832a6d5 3103out_unlock:
39279cc3
CM		 3104 mutex_unlock(&root->fs_info->fs_mutex);
3105 return ret;
3106}
3107
3108static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
3109 const char *symname)
3110{
3111 struct btrfs_trans_handle *trans;
3112 struct btrfs_root *root = BTRFS_I(dir)->root;
3113 struct btrfs_path *path;
3114 struct btrfs_key key;
1832a6d5 3115 struct inode *inode = NULL;
39279cc3
CM		 3116 int err;
3117 int drop_inode = 0;
3118 u64 objectid;
3119 int name_len;
3120 int datasize;
5f39d397 3121 unsigned long ptr;
39279cc3 3122 struct btrfs_file_extent_item *ei;
5f39d397 3123 struct extent_buffer *leaf;
1832a6d5 3124 unsigned long nr = 0;
39279cc3
CM		 3125
3126 name_len = strlen(symname) + 1;
3127 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
3128 return -ENAMETOOLONG;
1832a6d5 3129
39279cc3 3130 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 3131 err = btrfs_check_free_space(root, 1, 0);
3132 if (err)
3133 goto out_fail;
3134
39279cc3
CM		 3135 trans = btrfs_start_transaction(root, 1);
3136 btrfs_set_trans_block_group(trans, dir);
3137
3138 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
3139 if (err) {
3140 err = -ENOSPC;
3141 goto out_unlock;
3142 }
3143
9c58309d
CM		 3144 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
3145 dentry->d_name.len,
3146 dentry->d_parent->d_inode->i_ino, objectid,
39279cc3
CM		 3147 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
3148 err = PTR_ERR(inode);
3149 if (IS_ERR(inode))
3150 goto out_unlock;
3151
3152 btrfs_set_trans_block_group(trans, inode);
9c58309d 3153 err = btrfs_add_nondir(trans, dentry, inode, 0);
39279cc3
CM		 3154 if (err)
3155 drop_inode = 1;
3156 else {
3157 inode->i_mapping->a_ops = &btrfs_aops;
04160088 3158 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3
CM		 3159 inode->i_fop = &btrfs_file_operations;
3160 inode->i_op = &btrfs_file_inode_operations;
d1310b2e
CM		 3161 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
3162 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
a52d9a80 3163 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 3164 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
3165 inode->i_mapping, GFP_NOFS);
9069218d 3166 BTRFS_I(inode)->delalloc_bytes = 0;
d1310b2e 3167 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 3168 }
3169 dir->i_sb->s_dirt = 1;
3170 btrfs_update_inode_block_group(trans, inode);
3171 btrfs_update_inode_block_group(trans, dir);
3172 if (drop_inode)
3173 goto out_unlock;
3174
3175 path = btrfs_alloc_path();
3176 BUG_ON(!path);
3177 key.objectid = inode->i_ino;
3178 key.offset = 0;
39279cc3
CM		 3179 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
3180 datasize = btrfs_file_extent_calc_inline_size(name_len);
3181 err = btrfs_insert_empty_item(trans, root, path, &key,
3182 datasize);
54aa1f4d
CM		 3183 if (err) {
3184 drop_inode = 1;
3185 goto out_unlock;
3186 }
5f39d397
CM		 3187 leaf = path->nodes[0];
3188 ei = btrfs_item_ptr(leaf, path->slots[0],
3189 struct btrfs_file_extent_item);
3190 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
3191 btrfs_set_file_extent_type(leaf, ei,
39279cc3
CM		 3192 BTRFS_FILE_EXTENT_INLINE);
3193 ptr = btrfs_file_extent_inline_start(ei);
5f39d397
CM		 3194 write_extent_buffer(leaf, symname, ptr, name_len);
3195 btrfs_mark_buffer_dirty(leaf);
39279cc3 3196 btrfs_free_path(path);
5f39d397 3197
39279cc3
CM		 3198 inode->i_op = &btrfs_symlink_inode_operations;
3199 inode->i_mapping->a_ops = &btrfs_symlink_aops;
04160088 3200 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3 3201 inode->i_size = name_len - 1;
54aa1f4d
CM		 3202 err = btrfs_update_inode(trans, root, inode);
3203 if (err)
3204 drop_inode = 1;
39279cc3
CM		 3205
3206out_unlock:
d3c2fdcf 3207 nr = trans->blocks_used;
39279cc3 3208 btrfs_end_transaction(trans, root);
1832a6d5 3209out_fail:
39279cc3 3210 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 3211 if (drop_inode) {
3212 inode_dec_link_count(inode);
3213 iput(inode);
3214 }
d3c2fdcf 3215 btrfs_btree_balance_dirty(root, nr);
e2008b61 3216 btrfs_throttle(root);
39279cc3
CM		 3217 return err;
3218}
16432985 3219
fdebe2bd
Y		 3220static int btrfs_permission(struct inode *inode, int mask,
3221 struct nameidata *nd)
3222{
3223 if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
3224 return -EACCES;
3225 return generic_permission(inode, mask, NULL);
3226}
39279cc3
CM		 3227
3228static struct inode_operations btrfs_dir_inode_operations = {
3229 .lookup = btrfs_lookup,
3230 .create = btrfs_create,
3231 .unlink = btrfs_unlink,
3232 .link = btrfs_link,
3233 .mkdir = btrfs_mkdir,
3234 .rmdir = btrfs_rmdir,
3235 .rename = btrfs_rename,
3236 .symlink = btrfs_symlink,
3237 .setattr = btrfs_setattr,
618e21d5 3238 .mknod = btrfs_mknod,
5103e947
JB		 3239 .setxattr = generic_setxattr,
3240 .getxattr = generic_getxattr,
3241 .listxattr = btrfs_listxattr,
3242 .removexattr = generic_removexattr,
fdebe2bd 3243 .permission = btrfs_permission,
39279cc3 3244};
39279cc3
CM		 3245static struct inode_operations btrfs_dir_ro_inode_operations = {
3246 .lookup = btrfs_lookup,
fdebe2bd 3247 .permission = btrfs_permission,
39279cc3 3248};
39279cc3
CM		 3249static struct file_operations btrfs_dir_file_operations = {
3250 .llseek = generic_file_llseek,
3251 .read = generic_read_dir,
3252 .readdir = btrfs_readdir,
34287aa3 3253 .unlocked_ioctl = btrfs_ioctl,
39279cc3 3254#ifdef CONFIG_COMPAT
34287aa3 3255 .compat_ioctl = btrfs_ioctl,
39279cc3
CM		 3256#endif
3257};
3258
d1310b2e 3259static struct extent_io_ops btrfs_extent_io_ops = {
07157aac 3260 .fill_delalloc = run_delalloc_range,
065631f6 3261 .submit_bio_hook = btrfs_submit_bio_hook,
239b14b3 3262 .merge_bio_hook = btrfs_merge_bio_hook,
07157aac
CM		 3263 .readpage_io_hook = btrfs_readpage_io_hook,
3264 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
7e38326f 3265 .readpage_io_failed_hook = btrfs_readpage_io_failed_hook,
b0c68f8b
CM		 3266 .set_bit_hook = btrfs_set_bit_hook,
3267 .clear_bit_hook = btrfs_clear_bit_hook,
07157aac
CM		 3268};
3269
39279cc3
CM		 3270static struct address_space_operations btrfs_aops = {
3271 .readpage = btrfs_readpage,
3272 .writepage = btrfs_writepage,
b293f02e 3273 .writepages = btrfs_writepages,
3ab2fb5a 3274 .readpages = btrfs_readpages,
39279cc3 3275 .sync_page = block_sync_page,
39279cc3 3276 .bmap = btrfs_bmap,
16432985 3277 .direct_IO = btrfs_direct_IO,
a52d9a80
CM		 3278 .invalidatepage = btrfs_invalidatepage,
3279 .releasepage = btrfs_releasepage,
3280 .set_page_dirty = __set_page_dirty_nobuffers,
39279cc3
CM		 3281};
3282
3283static struct address_space_operations btrfs_symlink_aops = {
3284 .readpage = btrfs_readpage,
3285 .writepage = btrfs_writepage,
2bf5a725
CM		 3286 .invalidatepage = btrfs_invalidatepage,
3287 .releasepage = btrfs_releasepage,
39279cc3
CM		 3288};
3289
3290static struct inode_operations btrfs_file_inode_operations = {
3291 .truncate = btrfs_truncate,
3292 .getattr = btrfs_getattr,
3293 .setattr = btrfs_setattr,
5103e947
JB		 3294 .setxattr = generic_setxattr,
3295 .getxattr = generic_getxattr,
3296 .listxattr = btrfs_listxattr,
3297 .removexattr = generic_removexattr,
fdebe2bd 3298 .permission = btrfs_permission,
39279cc3 3299};
618e21d5
JB		 3300static struct inode_operations btrfs_special_inode_operations = {
3301 .getattr = btrfs_getattr,
3302 .setattr = btrfs_setattr,
fdebe2bd 3303 .permission = btrfs_permission,
618e21d5 3304};
39279cc3
CM		 3305static struct inode_operations btrfs_symlink_inode_operations = {
3306 .readlink = generic_readlink,
3307 .follow_link = page_follow_link_light,
3308 .put_link = page_put_link,
fdebe2bd 3309 .permission = btrfs_permission,
39279cc3 3310};
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