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Fix btrfs_get_extent and get_block corner cases, and disable O_DIRECT reads
[linux-2.6-block.git] / fs / btrfs / inode.c
CommitLineData
6cbd5570
CM		 1/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
065631f6 19#include <linux/bio.h>
39279cc3
CM		 20#include <linux/buffer_head.h>
21#include <linux/fs.h>
22#include <linux/pagemap.h>
23#include <linux/highmem.h>
24#include <linux/time.h>
25#include <linux/init.h>
26#include <linux/string.h>
27#include <linux/smp_lock.h>
28#include <linux/backing-dev.h>
29#include <linux/mpage.h>
30#include <linux/swap.h>
31#include <linux/writeback.h>
32#include <linux/statfs.h>
33#include <linux/compat.h>
9ebefb18 34#include <linux/bit_spinlock.h>
92fee66d 35#include <linux/version.h>
5103e947 36#include <linux/xattr.h>
39279cc3
CM		 37#include "ctree.h"
38#include "disk-io.h"
39#include "transaction.h"
40#include "btrfs_inode.h"
41#include "ioctl.h"
42#include "print-tree.h"
0b86a832 43#include "volumes.h"
39279cc3
CM		 44
45struct btrfs_iget_args {
46 u64 ino;
47 struct btrfs_root *root;
48};
49
50static struct inode_operations btrfs_dir_inode_operations;
51static struct inode_operations btrfs_symlink_inode_operations;
52static struct inode_operations btrfs_dir_ro_inode_operations;
618e21d5 53static struct inode_operations btrfs_special_inode_operations;
39279cc3
CM		 54static struct inode_operations btrfs_file_inode_operations;
55static struct address_space_operations btrfs_aops;
56static struct address_space_operations btrfs_symlink_aops;
57static struct file_operations btrfs_dir_file_operations;
d1310b2e 58static struct extent_io_ops btrfs_extent_io_ops;
39279cc3
CM		 59
60static struct kmem_cache *btrfs_inode_cachep;
61struct kmem_cache *btrfs_trans_handle_cachep;
62struct kmem_cache *btrfs_transaction_cachep;
63struct kmem_cache *btrfs_bit_radix_cachep;
64struct kmem_cache *btrfs_path_cachep;
65
66#define S_SHIFT 12
67static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
68 [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
69 [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
70 [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
71 [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
72 [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
73 [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
74 [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
75};
76
1832a6d5
CM		 77int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
78 int for_del)
79{
80 u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy);
81 u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy);
82 u64 thresh;
83 int ret = 0;
84
85 if (for_del)
f9ef6604 86 thresh = total * 90;
1832a6d5 87 else
f9ef6604
CM		 88 thresh = total * 85;
89
90 do_div(thresh, 100);
1832a6d5
CM		 91
92 spin_lock(&root->fs_info->delalloc_lock);
93 if (used + root->fs_info->delalloc_bytes + num_required > thresh)
94 ret = -ENOSPC;
95 spin_unlock(&root->fs_info->delalloc_lock);
96 return ret;
97}
98
be20aa9d 99static int cow_file_range(struct inode *inode, u64 start, u64 end)
b888db2b
CM		 100{
101 struct btrfs_root *root = BTRFS_I(inode)->root;
102 struct btrfs_trans_handle *trans;
b888db2b 103 u64 alloc_hint = 0;
db94535d 104 u64 num_bytes;
c59f8951 105 u64 cur_alloc_size;
db94535d 106 u64 blocksize = root->sectorsize;
d1310b2e
CM		 107 u64 orig_start = start;
108 u64 orig_num_bytes;
be20aa9d
CM		 109 struct btrfs_key ins;
110 int ret;
b888db2b 111
b888db2b 112 trans = btrfs_start_transaction(root, 1);
b888db2b 113 BUG_ON(!trans);
be20aa9d
CM		 114 btrfs_set_trans_block_group(trans, inode);
115
db94535d 116 num_bytes = (end - start + blocksize) & ~(blocksize - 1);
be20aa9d 117 num_bytes = max(blocksize, num_bytes);
b888db2b 118 ret = btrfs_drop_extents(trans, root, inode,
3326d1b0 119 start, start + num_bytes, start, &alloc_hint);
d1310b2e 120 orig_num_bytes = num_bytes;
db94535d 121
179e29e4
CM		 122 if (alloc_hint == EXTENT_MAP_INLINE)
123 goto out;
124
3b951516
CM		 125 BUG_ON(num_bytes > btrfs_super_total_bytes(&root->fs_info->super_copy));
126
c59f8951
CM		 127 while(num_bytes > 0) {
128 cur_alloc_size = min(num_bytes, root->fs_info->max_extent);
129 ret = btrfs_alloc_extent(trans, root, cur_alloc_size,
98d20f67 130 root->sectorsize,
c59f8951
CM		 131 root->root_key.objectid,
132 trans->transid,
133 inode->i_ino, start, 0,
134 alloc_hint, (u64)-1, &ins, 1);
135 if (ret) {
136 WARN_ON(1);
137 goto out;
138 }
98d20f67 139 cur_alloc_size = ins.offset;
c59f8951
CM		 140 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
141 start, ins.objectid, ins.offset,
142 ins.offset);
9069218d 143 inode->i_blocks += ins.offset >> 9;
5f56406a 144 btrfs_check_file(root, inode);
3b951516
CM		 145 if (num_bytes < cur_alloc_size) {
146 printk("num_bytes %Lu cur_alloc %Lu\n", num_bytes,
147 cur_alloc_size);
148 break;
149 }
c59f8951
CM		 150 num_bytes -= cur_alloc_size;
151 alloc_hint = ins.objectid + ins.offset;
152 start += cur_alloc_size;
b888db2b 153 }
d1310b2e
CM		 154 btrfs_drop_extent_cache(inode, orig_start,
155 orig_start + orig_num_bytes - 1);
dc17ff8f 156 btrfs_add_ordered_inode(inode);
9069218d 157 btrfs_update_inode(trans, root, inode);
b888db2b
CM		 158out:
159 btrfs_end_transaction(trans, root);
be20aa9d
CM		 160 return ret;
161}
162
163static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end)
164{
165 u64 extent_start;
166 u64 extent_end;
167 u64 bytenr;
168 u64 cow_end;
1832a6d5 169 u64 loops = 0;
c31f8830 170 u64 total_fs_bytes;
be20aa9d
CM		 171 struct btrfs_root *root = BTRFS_I(inode)->root;
172 struct extent_buffer *leaf;
173 int found_type;
174 struct btrfs_path *path;
175 struct btrfs_file_extent_item *item;
176 int ret;
177 int err;
178 struct btrfs_key found_key;
179
c31f8830 180 total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
be20aa9d
CM		 181 path = btrfs_alloc_path();
182 BUG_ON(!path);
183again:
184 ret = btrfs_lookup_file_extent(NULL, root, path,
185 inode->i_ino, start, 0);
186 if (ret < 0) {
187 btrfs_free_path(path);
188 return ret;
189 }
190
191 cow_end = end;
192 if (ret != 0) {
193 if (path->slots[0] == 0)
194 goto not_found;
195 path->slots[0]--;
196 }
197
198 leaf = path->nodes[0];
199 item = btrfs_item_ptr(leaf, path->slots[0],
200 struct btrfs_file_extent_item);
201
202 /* are we inside the extent that was found? */
203 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
204 found_type = btrfs_key_type(&found_key);
205 if (found_key.objectid != inode->i_ino ||
206 found_type != BTRFS_EXTENT_DATA_KEY) {
207 goto not_found;
208 }
209
210 found_type = btrfs_file_extent_type(leaf, item);
211 extent_start = found_key.offset;
212 if (found_type == BTRFS_FILE_EXTENT_REG) {
c31f8830
CM		 213 u64 extent_num_bytes;
214
215 extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item);
216 extent_end = extent_start + extent_num_bytes;
be20aa9d
CM		 217 err = 0;
218
1832a6d5
CM		 219 if (loops && start != extent_start)
220 goto not_found;
221
be20aa9d
CM		 222 if (start < extent_start || start >= extent_end)
223 goto not_found;
224
225 cow_end = min(end, extent_end - 1);
226 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
227 if (bytenr == 0)
228 goto not_found;
229
c31f8830
CM		 230 /*
231 * we may be called by the resizer, make sure we're inside
232 * the limits of the FS
233 */
234 if (bytenr + extent_num_bytes > total_fs_bytes)
235 goto not_found;
236
be20aa9d
CM		 237 if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) {
238 goto not_found;
239 }
240
241 start = extent_end;
bd09835d 242 } else {
be20aa9d
CM		 243 goto not_found;
244 }
245loop:
246 if (start > end) {
247 btrfs_free_path(path);
248 return 0;
249 }
250 btrfs_release_path(root, path);
1832a6d5 251 loops++;
be20aa9d
CM		 252 goto again;
253
254not_found:
255 cow_file_range(inode, start, cow_end);
256 start = cow_end + 1;
257 goto loop;
258}
259
260static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
261{
262 struct btrfs_root *root = BTRFS_I(inode)->root;
263 int ret;
be20aa9d 264 mutex_lock(&root->fs_info->fs_mutex);
b98b6767
Y		 265 if (btrfs_test_opt(root, NODATACOW) ||
266 btrfs_test_flag(inode, NODATACOW))
be20aa9d
CM		 267 ret = run_delalloc_nocow(inode, start, end);
268 else
269 ret = cow_file_range(inode, start, end);
1832a6d5 270
b888db2b
CM		 271 mutex_unlock(&root->fs_info->fs_mutex);
272 return ret;
273}
274
291d673e 275int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
b0c68f8b 276 unsigned long old, unsigned long bits)
291d673e 277{
b0c68f8b 278 if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
291d673e
CM		 279 struct btrfs_root *root = BTRFS_I(inode)->root;
280 spin_lock(&root->fs_info->delalloc_lock);
9069218d 281 BTRFS_I(inode)->delalloc_bytes += end - start + 1;
291d673e
CM		 282 root->fs_info->delalloc_bytes += end - start + 1;
283 spin_unlock(&root->fs_info->delalloc_lock);
284 }
285 return 0;
286}
287
288int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
b0c68f8b 289 unsigned long old, unsigned long bits)
291d673e 290{
b0c68f8b 291 if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
291d673e
CM		 292 struct btrfs_root *root = BTRFS_I(inode)->root;
293 spin_lock(&root->fs_info->delalloc_lock);
b0c68f8b
CM		 294 if (end - start + 1 > root->fs_info->delalloc_bytes) {
295 printk("warning: delalloc account %Lu %Lu\n",
296 end - start + 1, root->fs_info->delalloc_bytes);
297 root->fs_info->delalloc_bytes = 0;
9069218d 298 BTRFS_I(inode)->delalloc_bytes = 0;
b0c68f8b
CM		 299 } else {
300 root->fs_info->delalloc_bytes -= end - start + 1;
9069218d 301 BTRFS_I(inode)->delalloc_bytes -= end - start + 1;
b0c68f8b 302 }
291d673e
CM		 303 spin_unlock(&root->fs_info->delalloc_lock);
304 }
305 return 0;
306}
307
239b14b3
CM		 308int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
309 size_t size, struct bio *bio)
310{
311 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
312 struct btrfs_mapping_tree *map_tree;
239b14b3 313 u64 logical = bio->bi_sector << 9;
239b14b3
CM		 314 u64 length = 0;
315 u64 map_length;
239b14b3
CM		 316 int ret;
317
f2d8d74d 318 length = bio->bi_size;
239b14b3
CM		 319 map_tree = &root->fs_info->mapping_tree;
320 map_length = length;
cea9e445 321 ret = btrfs_map_block(map_tree, READ, logical,
f188591e 322 &map_length, NULL, 0);
cea9e445 323
239b14b3 324 if (map_length < length + size) {
239b14b3
CM		 325 return 1;
326 }
327 return 0;
328}
329
44b8bd7e 330int __btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
f188591e 331 int mirror_num)
065631f6 332{
065631f6
CM		 333 struct btrfs_root *root = BTRFS_I(inode)->root;
334 struct btrfs_trans_handle *trans;
335 int ret = 0;
e015640f
CM		 336 char *sums = NULL;
337
338 ret = btrfs_csum_one_bio(root, bio, &sums);
339 BUG_ON(ret);
065631f6 340
44b8bd7e
CM		 341 mutex_lock(&root->fs_info->fs_mutex);
342 trans = btrfs_start_transaction(root, 1);
e015640f 343
44b8bd7e 344 btrfs_set_trans_block_group(trans, inode);
e015640f
CM		 345 btrfs_csum_file_blocks(trans, root, inode, bio, sums);
346
44b8bd7e
CM		 347 ret = btrfs_end_transaction(trans, root);
348 BUG_ON(ret);
349 mutex_unlock(&root->fs_info->fs_mutex);
e015640f
CM		 350
351 kfree(sums);
352
44b8bd7e
CM		 353 return btrfs_map_bio(root, rw, bio, mirror_num);
354}
355
356int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
357 int mirror_num)
358{
359 struct btrfs_root *root = BTRFS_I(inode)->root;
360 int ret = 0;
361
22c59948
CM		 362 if (!(rw & (1 << BIO_RW))) {
363 ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
364 BUG_ON(ret);
0b86a832
CM		 365 goto mapit;
366 }
065631f6
CM		 367
368 if (btrfs_test_opt(root, NODATASUM) ||
0b86a832
CM		 369 btrfs_test_flag(inode, NODATASUM)) {
370 goto mapit;
371 }
065631f6 372
44b8bd7e
CM		 373 return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
374 inode, rw, bio, mirror_num,
375 __btrfs_submit_bio_hook);
0b86a832 376mapit:
f188591e 377 return btrfs_map_bio(root, rw, bio, mirror_num);
065631f6 378}
6885f308 379
07157aac
CM		 380int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
381{
382 int ret = 0;
383 struct inode *inode = page->mapping->host;
384 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 385 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
07157aac
CM		 386 struct btrfs_csum_item *item;
387 struct btrfs_path *path = NULL;
ff79f819 388 u32 csum;
699122f5 389
b98b6767
Y		 390 if (btrfs_test_opt(root, NODATASUM) ||
391 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 392 return 0;
699122f5 393
07157aac
CM		 394 mutex_lock(&root->fs_info->fs_mutex);
395 path = btrfs_alloc_path();
396 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
397 if (IS_ERR(item)) {
398 ret = PTR_ERR(item);
399 /* a csum that isn't present is a preallocated region. */
400 if (ret == -ENOENT || ret == -EFBIG)
401 ret = 0;
ff79f819 402 csum = 0;
aadfeb6e 403 printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start);
07157aac
CM		 404 goto out;
405 }
ff79f819
CM		 406 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
407 BTRFS_CRC32_SIZE);
d1310b2e 408 set_state_private(io_tree, start, csum);
07157aac
CM		 409out:
410 if (path)
411 btrfs_free_path(path);
412 mutex_unlock(&root->fs_info->fs_mutex);
413 return ret;
414}
415
7e38326f
CM		 416struct io_failure_record {
417 struct page *page;
418 u64 start;
419 u64 len;
420 u64 logical;
421 int last_mirror;
422};
423
424int btrfs_readpage_io_failed_hook(struct bio *failed_bio,
425 struct page *page, u64 start, u64 end,
426 struct extent_state *state)
427{
428 struct io_failure_record *failrec = NULL;
429 u64 private;
430 struct extent_map *em;
431 struct inode *inode = page->mapping->host;
432 struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree;
3b951516 433 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
7e38326f
CM		 434 struct bio *bio;
435 int num_copies;
436 int ret;
437 u64 logical;
438
439 ret = get_state_private(failure_tree, start, &private);
440 if (ret) {
7e38326f
CM		 441 failrec = kmalloc(sizeof(*failrec), GFP_NOFS);
442 if (!failrec)
443 return -ENOMEM;
444 failrec->start = start;
445 failrec->len = end - start + 1;
446 failrec->last_mirror = 0;
447
3b951516
CM		 448 spin_lock(&em_tree->lock);
449 em = lookup_extent_mapping(em_tree, start, failrec->len);
450 if (em->start > start || em->start + em->len < start) {
451 free_extent_map(em);
452 em = NULL;
453 }
454 spin_unlock(&em_tree->lock);
7e38326f
CM		 455
456 if (!em || IS_ERR(em)) {
457 kfree(failrec);
458 return -EIO;
459 }
460 logical = start - em->start;
461 logical = em->block_start + logical;
462 failrec->logical = logical;
463 free_extent_map(em);
464 set_extent_bits(failure_tree, start, end, EXTENT_LOCKED |
465 EXTENT_DIRTY, GFP_NOFS);
587f7704
CM		 466 set_state_private(failure_tree, start,
467 (u64)(unsigned long)failrec);
7e38326f 468 } else {
587f7704 469 failrec = (struct io_failure_record *)(unsigned long)private;
7e38326f
CM		 470 }
471 num_copies = btrfs_num_copies(
472 &BTRFS_I(inode)->root->fs_info->mapping_tree,
473 failrec->logical, failrec->len);
474 failrec->last_mirror++;
475 if (!state) {
476 spin_lock_irq(&BTRFS_I(inode)->io_tree.lock);
477 state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree,
478 failrec->start,
479 EXTENT_LOCKED);
480 if (state && state->start != failrec->start)
481 state = NULL;
482 spin_unlock_irq(&BTRFS_I(inode)->io_tree.lock);
483 }
484 if (!state || failrec->last_mirror > num_copies) {
485 set_state_private(failure_tree, failrec->start, 0);
486 clear_extent_bits(failure_tree, failrec->start,
487 failrec->start + failrec->len - 1,
488 EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS);
489 kfree(failrec);
490 return -EIO;
491 }
492 bio = bio_alloc(GFP_NOFS, 1);
493 bio->bi_private = state;
494 bio->bi_end_io = failed_bio->bi_end_io;
495 bio->bi_sector = failrec->logical >> 9;
496 bio->bi_bdev = failed_bio->bi_bdev;
e1c4b745 497 bio->bi_size = 0;
7e38326f
CM		 498 bio_add_page(bio, page, failrec->len, start - page_offset(page));
499 btrfs_submit_bio_hook(inode, READ, bio, failrec->last_mirror);
500 return 0;
501}
502
70dec807
CM		 503int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
504 struct extent_state *state)
07157aac 505{
35ebb934 506 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
07157aac 507 struct inode *inode = page->mapping->host;
d1310b2e 508 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
07157aac 509 char *kaddr;
aadfeb6e 510 u64 private = ~(u32)0;
07157aac 511 int ret;
ff79f819
CM		 512 struct btrfs_root *root = BTRFS_I(inode)->root;
513 u32 csum = ~(u32)0;
bbf0d006 514 unsigned long flags;
d1310b2e 515
b98b6767
Y		 516 if (btrfs_test_opt(root, NODATASUM) ||
517 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 518 return 0;
c2e639f0 519 if (state && state->start == start) {
70dec807
CM		 520 private = state->private;
521 ret = 0;
522 } else {
523 ret = get_state_private(io_tree, start, &private);
524 }
bbf0d006 525 local_irq_save(flags);
07157aac
CM		 526 kaddr = kmap_atomic(page, KM_IRQ0);
527 if (ret) {
528 goto zeroit;
529 }
ff79f819
CM		 530 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
531 btrfs_csum_final(csum, (char *)&csum);
532 if (csum != private) {
07157aac
CM		 533 goto zeroit;
534 }
535 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 536 local_irq_restore(flags);
7e38326f
CM		 537
538 /* if the io failure tree for this inode is non-empty,
539 * check to see if we've recovered from a failed IO
540 */
541 private = 0;
542 if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private,
543 (u64)-1, 1, EXTENT_DIRTY)) {
544 u64 private_failure;
545 struct io_failure_record *failure;
546 ret = get_state_private(&BTRFS_I(inode)->io_failure_tree,
547 start, &private_failure);
548 if (ret == 0) {
587f7704
CM		 549 failure = (struct io_failure_record *)(unsigned long)
550 private_failure;
7e38326f
CM		 551 set_state_private(&BTRFS_I(inode)->io_failure_tree,
552 failure->start, 0);
553 clear_extent_bits(&BTRFS_I(inode)->io_failure_tree,
554 failure->start,
555 failure->start + failure->len - 1,
556 EXTENT_DIRTY | EXTENT_LOCKED,
557 GFP_NOFS);
558 kfree(failure);
559 }
560 }
07157aac
CM		 561 return 0;
562
563zeroit:
aadfeb6e
CM		 564 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
565 page->mapping->host->i_ino, (unsigned long long)start, csum,
566 private);
db94535d
CM		 567 memset(kaddr + offset, 1, end - start + 1);
568 flush_dcache_page(page);
07157aac 569 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 570 local_irq_restore(flags);
3b951516
CM		 571 if (private == 0)
572 return 0;
7e38326f 573 return -EIO;
07157aac 574}
b888db2b 575
39279cc3
CM		 576void btrfs_read_locked_inode(struct inode *inode)
577{
578 struct btrfs_path *path;
5f39d397 579 struct extent_buffer *leaf;
39279cc3 580 struct btrfs_inode_item *inode_item;
0b86a832 581 struct btrfs_timespec *tspec;
39279cc3
CM		 582 struct btrfs_root *root = BTRFS_I(inode)->root;
583 struct btrfs_key location;
584 u64 alloc_group_block;
618e21d5 585 u32 rdev;
39279cc3
CM		 586 int ret;
587
588 path = btrfs_alloc_path();
589 BUG_ON(!path);
39279cc3 590 mutex_lock(&root->fs_info->fs_mutex);
39279cc3 591 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
dc17ff8f 592
39279cc3 593 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
5f39d397 594 if (ret)
39279cc3 595 goto make_bad;
39279cc3 596
5f39d397
CM		 597 leaf = path->nodes[0];
598 inode_item = btrfs_item_ptr(leaf, path->slots[0],
599 struct btrfs_inode_item);
600
601 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
602 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
603 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
604 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
605 inode->i_size = btrfs_inode_size(leaf, inode_item);
606
607 tspec = btrfs_inode_atime(inode_item);
608 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
609 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
610
611 tspec = btrfs_inode_mtime(inode_item);
612 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
613 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
614
615 tspec = btrfs_inode_ctime(inode_item);
616 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
617 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
618
619 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
620 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
618e21d5 621 inode->i_rdev = 0;
5f39d397
CM		 622 rdev = btrfs_inode_rdev(leaf, inode_item);
623
624 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
39279cc3
CM		 625 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
626 alloc_group_block);
b98b6767 627 BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
e52ec0eb
CM		 628 if (!BTRFS_I(inode)->block_group) {
629 BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
0b86a832
CM		 630 NULL, 0,
631 BTRFS_BLOCK_GROUP_METADATA, 0);
e52ec0eb 632 }
39279cc3
CM		 633 btrfs_free_path(path);
634 inode_item = NULL;
635
636 mutex_unlock(&root->fs_info->fs_mutex);
637
638 switch (inode->i_mode & S_IFMT) {
39279cc3
CM		 639 case S_IFREG:
640 inode->i_mapping->a_ops = &btrfs_aops;
04160088 641 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
d1310b2e 642 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 643 inode->i_fop = &btrfs_file_operations;
644 inode->i_op = &btrfs_file_inode_operations;
645 break;
646 case S_IFDIR:
647 inode->i_fop = &btrfs_dir_file_operations;
648 if (root == root->fs_info->tree_root)
649 inode->i_op = &btrfs_dir_ro_inode_operations;
650 else
651 inode->i_op = &btrfs_dir_inode_operations;
652 break;
653 case S_IFLNK:
654 inode->i_op = &btrfs_symlink_inode_operations;
655 inode->i_mapping->a_ops = &btrfs_symlink_aops;
04160088 656 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3 657 break;
618e21d5
JB		 658 default:
659 init_special_inode(inode, inode->i_mode, rdev);
660 break;
39279cc3
CM		 661 }
662 return;
663
664make_bad:
665 btrfs_release_path(root, path);
666 btrfs_free_path(path);
667 mutex_unlock(&root->fs_info->fs_mutex);
668 make_bad_inode(inode);
669}
670
5f39d397
CM		 671static void fill_inode_item(struct extent_buffer *leaf,
672 struct btrfs_inode_item *item,
39279cc3
CM		 673 struct inode *inode)
674{
5f39d397
CM		 675 btrfs_set_inode_uid(leaf, item, inode->i_uid);
676 btrfs_set_inode_gid(leaf, item, inode->i_gid);
677 btrfs_set_inode_size(leaf, item, inode->i_size);
678 btrfs_set_inode_mode(leaf, item, inode->i_mode);
679 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
680
681 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
682 inode->i_atime.tv_sec);
683 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
684 inode->i_atime.tv_nsec);
685
686 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
687 inode->i_mtime.tv_sec);
688 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
689 inode->i_mtime.tv_nsec);
690
691 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
692 inode->i_ctime.tv_sec);
693 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
694 inode->i_ctime.tv_nsec);
695
696 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
697 btrfs_set_inode_generation(leaf, item, inode->i_generation);
698 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
b98b6767 699 btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
5f39d397 700 btrfs_set_inode_block_group(leaf, item,
39279cc3
CM		 701 BTRFS_I(inode)->block_group->key.objectid);
702}
703
a52d9a80 704int btrfs_update_inode(struct btrfs_trans_handle *trans,
39279cc3
CM		 705 struct btrfs_root *root,
706 struct inode *inode)
707{
708 struct btrfs_inode_item *inode_item;
709 struct btrfs_path *path;
5f39d397 710 struct extent_buffer *leaf;
39279cc3
CM		 711 int ret;
712
713 path = btrfs_alloc_path();
714 BUG_ON(!path);
39279cc3
CM		 715 ret = btrfs_lookup_inode(trans, root, path,
716 &BTRFS_I(inode)->location, 1);
717 if (ret) {
718 if (ret > 0)
719 ret = -ENOENT;
720 goto failed;
721 }
722
5f39d397
CM		 723 leaf = path->nodes[0];
724 inode_item = btrfs_item_ptr(leaf, path->slots[0],
39279cc3
CM		 725 struct btrfs_inode_item);
726
5f39d397
CM		 727 fill_inode_item(leaf, inode_item, inode);
728 btrfs_mark_buffer_dirty(leaf);
15ee9bc7 729 btrfs_set_inode_last_trans(trans, inode);
39279cc3
CM		 730 ret = 0;
731failed:
732 btrfs_release_path(root, path);
733 btrfs_free_path(path);
734 return ret;
735}
736
737
738static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
739 struct btrfs_root *root,
740 struct inode *dir,
741 struct dentry *dentry)
742{
743 struct btrfs_path *path;
744 const char *name = dentry->d_name.name;
745 int name_len = dentry->d_name.len;
746 int ret = 0;
5f39d397 747 struct extent_buffer *leaf;
39279cc3 748 struct btrfs_dir_item *di;
5f39d397 749 struct btrfs_key key;
39279cc3
CM		 750
751 path = btrfs_alloc_path();
54aa1f4d
CM		 752 if (!path) {
753 ret = -ENOMEM;
754 goto err;
755 }
756
39279cc3
CM		 757 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
758 name, name_len, -1);
759 if (IS_ERR(di)) {
760 ret = PTR_ERR(di);
761 goto err;
762 }
763 if (!di) {
764 ret = -ENOENT;
765 goto err;
766 }
5f39d397
CM		 767 leaf = path->nodes[0];
768 btrfs_dir_item_key_to_cpu(leaf, di, &key);
39279cc3 769 ret = btrfs_delete_one_dir_name(trans, root, path, di);
54aa1f4d
CM		 770 if (ret)
771 goto err;
39279cc3
CM		 772 btrfs_release_path(root, path);
773
774 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
5f39d397 775 key.objectid, name, name_len, -1);
39279cc3
CM		 776 if (IS_ERR(di)) {
777 ret = PTR_ERR(di);
778 goto err;
779 }
780 if (!di) {
781 ret = -ENOENT;
782 goto err;
783 }
784 ret = btrfs_delete_one_dir_name(trans, root, path, di);
39279cc3
CM		 785
786 dentry->d_inode->i_ctime = dir->i_ctime;
76fea00a
CM		 787 ret = btrfs_del_inode_ref(trans, root, name, name_len,
788 dentry->d_inode->i_ino,
789 dentry->d_parent->d_inode->i_ino);
790 if (ret) {
791 printk("failed to delete reference to %.*s, "
792 "inode %lu parent %lu\n", name_len, name,
793 dentry->d_inode->i_ino,
794 dentry->d_parent->d_inode->i_ino);
3954401f 795 }
39279cc3
CM		 796err:
797 btrfs_free_path(path);
798 if (!ret) {
799 dir->i_size -= name_len * 2;
79c44584 800 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
39279cc3 801 btrfs_update_inode(trans, root, dir);
6da6abae
CM		 802#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
803 dentry->d_inode->i_nlink--;
804#else
39279cc3 805 drop_nlink(dentry->d_inode);
6da6abae 806#endif
54aa1f4d 807 ret = btrfs_update_inode(trans, root, dentry->d_inode);
39279cc3
CM		 808 dir->i_sb->s_dirt = 1;
809 }
810 return ret;
811}
812
813static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
814{
815 struct btrfs_root *root;
816 struct btrfs_trans_handle *trans;
2da98f00 817 struct inode *inode = dentry->d_inode;
39279cc3 818 int ret;
1832a6d5 819 unsigned long nr = 0;
39279cc3
CM		 820
821 root = BTRFS_I(dir)->root;
822 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 823
824 ret = btrfs_check_free_space(root, 1, 1);
825 if (ret)
826 goto fail;
827
39279cc3 828 trans = btrfs_start_transaction(root, 1);
5f39d397 829
39279cc3
CM		 830 btrfs_set_trans_block_group(trans, dir);
831 ret = btrfs_unlink_trans(trans, root, dir, dentry);
d3c2fdcf 832 nr = trans->blocks_used;
5f39d397 833
2da98f00
CM		 834 if (inode->i_nlink == 0) {
835 int found;
836 /* if the inode isn't linked anywhere,
837 * we don't need to worry about
838 * data=ordered
839 */
840 found = btrfs_del_ordered_inode(inode);
841 if (found == 1) {
842 atomic_dec(&inode->i_count);
843 }
844 }
845
39279cc3 846 btrfs_end_transaction(trans, root);
1832a6d5 847fail:
39279cc3 848 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 849 btrfs_btree_balance_dirty(root, nr);
e2008b61 850 btrfs_throttle(root);
39279cc3
CM		 851 return ret;
852}
853
854static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
855{
856 struct inode *inode = dentry->d_inode;
1832a6d5 857 int err = 0;
39279cc3
CM		 858 int ret;
859 struct btrfs_root *root = BTRFS_I(dir)->root;
39279cc3 860 struct btrfs_trans_handle *trans;
1832a6d5 861 unsigned long nr = 0;
39279cc3 862
134d4512
Y		 863 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
864 return -ENOTEMPTY;
865
39279cc3 866 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 867 ret = btrfs_check_free_space(root, 1, 1);
868 if (ret)
869 goto fail;
870
39279cc3
CM		 871 trans = btrfs_start_transaction(root, 1);
872 btrfs_set_trans_block_group(trans, dir);
39279cc3
CM		 873
874 /* now the directory is empty */
875 err = btrfs_unlink_trans(trans, root, dir, dentry);
876 if (!err) {
877 inode->i_size = 0;
878 }
3954401f 879
d3c2fdcf 880 nr = trans->blocks_used;
39279cc3 881 ret = btrfs_end_transaction(trans, root);
1832a6d5 882fail:
134d4512 883 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 884 btrfs_btree_balance_dirty(root, nr);
e2008b61 885 btrfs_throttle(root);
3954401f 886
39279cc3
CM		 887 if (ret && !err)
888 err = ret;
889 return err;
890}
891
39279cc3
CM		 892/*
893 * this can truncate away extent items, csum items and directory items.
894 * It starts at a high offset and removes keys until it can't find
895 * any higher than i_size.
896 *
897 * csum items that cross the new i_size are truncated to the new size
898 * as well.
899 */
900static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
901 struct btrfs_root *root,
85e21bac
CM		 902 struct inode *inode,
903 u32 min_type)
39279cc3
CM		 904{
905 int ret;
906 struct btrfs_path *path;
907 struct btrfs_key key;
5f39d397 908 struct btrfs_key found_key;
39279cc3 909 u32 found_type;
5f39d397 910 struct extent_buffer *leaf;
39279cc3
CM		 911 struct btrfs_file_extent_item *fi;
912 u64 extent_start = 0;
db94535d 913 u64 extent_num_bytes = 0;
39279cc3 914 u64 item_end = 0;
7bb86316 915 u64 root_gen = 0;
d8d5f3e1 916 u64 root_owner = 0;
39279cc3
CM		 917 int found_extent;
918 int del_item;
85e21bac
CM		 919 int pending_del_nr = 0;
920 int pending_del_slot = 0;
179e29e4 921 int extent_type = -1;
3b951516 922 u64 mask = root->sectorsize - 1;
39279cc3 923
3b951516 924 btrfs_drop_extent_cache(inode, inode->i_size & (~mask), (u64)-1);
39279cc3 925 path = btrfs_alloc_path();
3c69faec 926 path->reada = -1;
39279cc3 927 BUG_ON(!path);
5f39d397 928
39279cc3
CM		 929 /* FIXME, add redo link to tree so we don't leak on crash */
930 key.objectid = inode->i_ino;
931 key.offset = (u64)-1;
5f39d397
CM		 932 key.type = (u8)-1;
933
85e21bac
CM		 934 btrfs_init_path(path);
935search_again:
936 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
937 if (ret < 0) {
938 goto error;
939 }
940 if (ret > 0) {
941 BUG_ON(path->slots[0] == 0);
942 path->slots[0]--;
943 }
944
39279cc3 945 while(1) {
39279cc3 946 fi = NULL;
5f39d397
CM		 947 leaf = path->nodes[0];
948 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
949 found_type = btrfs_key_type(&found_key);
39279cc3 950
5f39d397 951 if (found_key.objectid != inode->i_ino)
39279cc3 952 break;
5f39d397 953
85e21bac 954 if (found_type < min_type)
39279cc3
CM		 955 break;
956
5f39d397 957 item_end = found_key.offset;
39279cc3 958 if (found_type == BTRFS_EXTENT_DATA_KEY) {
5f39d397 959 fi = btrfs_item_ptr(leaf, path->slots[0],
39279cc3 960 struct btrfs_file_extent_item);
179e29e4
CM		 961 extent_type = btrfs_file_extent_type(leaf, fi);
962 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
5f39d397 963 item_end +=
db94535d 964 btrfs_file_extent_num_bytes(leaf, fi);
179e29e4
CM		 965 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
966 struct btrfs_item *item = btrfs_item_nr(leaf,
967 path->slots[0]);
968 item_end += btrfs_file_extent_inline_len(leaf,
969 item);
39279cc3 970 }
008630c1 971 item_end--;
39279cc3
CM		 972 }
973 if (found_type == BTRFS_CSUM_ITEM_KEY) {
974 ret = btrfs_csum_truncate(trans, root, path,
975 inode->i_size);
976 BUG_ON(ret);
977 }
008630c1 978 if (item_end < inode->i_size) {
b888db2b
CM		 979 if (found_type == BTRFS_DIR_ITEM_KEY) {
980 found_type = BTRFS_INODE_ITEM_KEY;
981 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
982 found_type = BTRFS_CSUM_ITEM_KEY;
85e21bac
CM		 983 } else if (found_type == BTRFS_EXTENT_DATA_KEY) {
984 found_type = BTRFS_XATTR_ITEM_KEY;
985 } else if (found_type == BTRFS_XATTR_ITEM_KEY) {
986 found_type = BTRFS_INODE_REF_KEY;
b888db2b
CM		 987 } else if (found_type) {
988 found_type--;
989 } else {
990 break;
39279cc3 991 }
a61721d5 992 btrfs_set_key_type(&key, found_type);
85e21bac 993 goto next;
39279cc3 994 }
5f39d397 995 if (found_key.offset >= inode->i_size)
39279cc3
CM		 996 del_item = 1;
997 else
998 del_item = 0;
999 found_extent = 0;
1000
1001 /* FIXME, shrink the extent if the ref count is only 1 */
179e29e4
CM		 1002 if (found_type != BTRFS_EXTENT_DATA_KEY)
1003 goto delete;
1004
1005 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
39279cc3 1006 u64 num_dec;
db94535d 1007 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
39279cc3 1008 if (!del_item) {
db94535d
CM		 1009 u64 orig_num_bytes =
1010 btrfs_file_extent_num_bytes(leaf, fi);
1011 extent_num_bytes = inode->i_size -
5f39d397 1012 found_key.offset + root->sectorsize - 1;
b1632b10
Y		 1013 extent_num_bytes = extent_num_bytes &
1014 ~((u64)root->sectorsize - 1);
db94535d
CM		 1015 btrfs_set_file_extent_num_bytes(leaf, fi,
1016 extent_num_bytes);
1017 num_dec = (orig_num_bytes -
9069218d
CM		 1018 extent_num_bytes);
1019 if (extent_start != 0)
1020 dec_i_blocks(inode, num_dec);
5f39d397 1021 btrfs_mark_buffer_dirty(leaf);
39279cc3 1022 } else {
db94535d
CM		 1023 extent_num_bytes =
1024 btrfs_file_extent_disk_num_bytes(leaf,
1025 fi);
39279cc3 1026 /* FIXME blocksize != 4096 */
9069218d 1027 num_dec = btrfs_file_extent_num_bytes(leaf, fi);
39279cc3
CM		 1028 if (extent_start != 0) {
1029 found_extent = 1;
9069218d 1030 dec_i_blocks(inode, num_dec);
39279cc3 1031 }
d8d5f3e1
CM		 1032 root_gen = btrfs_header_generation(leaf);
1033 root_owner = btrfs_header_owner(leaf);
39279cc3 1034 }
9069218d
CM		 1035 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
1036 if (!del_item) {
1037 u32 newsize = inode->i_size - found_key.offset;
1038 dec_i_blocks(inode, item_end + 1 -
1039 found_key.offset - newsize);
1040 newsize =
1041 btrfs_file_extent_calc_inline_size(newsize);
1042 ret = btrfs_truncate_item(trans, root, path,
1043 newsize, 1);
1044 BUG_ON(ret);
1045 } else {
1046 dec_i_blocks(inode, item_end + 1 -
1047 found_key.offset);
1048 }
39279cc3 1049 }
179e29e4 1050delete:
39279cc3 1051 if (del_item) {
85e21bac
CM		 1052 if (!pending_del_nr) {
1053 /* no pending yet, add ourselves */
1054 pending_del_slot = path->slots[0];
1055 pending_del_nr = 1;
1056 } else if (pending_del_nr &&
1057 path->slots[0] + 1 == pending_del_slot) {
1058 /* hop on the pending chunk */
1059 pending_del_nr++;
1060 pending_del_slot = path->slots[0];
1061 } else {
1062 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot);
1063 }
39279cc3
CM		 1064 } else {
1065 break;
1066 }
39279cc3
CM		 1067 if (found_extent) {
1068 ret = btrfs_free_extent(trans, root, extent_start,
7bb86316 1069 extent_num_bytes,
d8d5f3e1 1070 root_owner,
7bb86316
CM		 1071 root_gen, inode->i_ino,
1072 found_key.offset, 0);
39279cc3
CM		 1073 BUG_ON(ret);
1074 }
85e21bac
CM		 1075next:
1076 if (path->slots[0] == 0) {
1077 if (pending_del_nr)
1078 goto del_pending;
1079 btrfs_release_path(root, path);
1080 goto search_again;
1081 }
1082
1083 path->slots[0]--;
1084 if (pending_del_nr &&
1085 path->slots[0] + 1 != pending_del_slot) {
1086 struct btrfs_key debug;
1087del_pending:
1088 btrfs_item_key_to_cpu(path->nodes[0], &debug,
1089 pending_del_slot);
1090 ret = btrfs_del_items(trans, root, path,
1091 pending_del_slot,
1092 pending_del_nr);
1093 BUG_ON(ret);
1094 pending_del_nr = 0;
1095 btrfs_release_path(root, path);
1096 goto search_again;
1097 }
39279cc3
CM		 1098 }
1099 ret = 0;
1100error:
85e21bac
CM		 1101 if (pending_del_nr) {
1102 ret = btrfs_del_items(trans, root, path, pending_del_slot,
1103 pending_del_nr);
1104 }
39279cc3
CM		 1105 btrfs_release_path(root, path);
1106 btrfs_free_path(path);
1107 inode->i_sb->s_dirt = 1;
1108 return ret;
1109}
1110
b888db2b 1111static int btrfs_cow_one_page(struct inode *inode, struct page *page,
a52d9a80
CM		 1112 size_t zero_start)
1113{
1114 char *kaddr;
d1310b2e 1115 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
35ebb934 1116 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
b888db2b 1117 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
1832a6d5 1118 int ret = 0;
a52d9a80 1119
190662b2 1120 WARN_ON(!PageLocked(page));
b3cfa35a 1121 set_page_extent_mapped(page);
a52d9a80 1122
d1310b2e 1123 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
d1310b2e 1124 set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start,
b888db2b 1125 page_end, GFP_NOFS);
1832a6d5 1126
a52d9a80 1127 if (zero_start != PAGE_CACHE_SIZE) {
b888db2b 1128 kaddr = kmap(page);
a52d9a80
CM		 1129 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
1130 flush_dcache_page(page);
b888db2b 1131 kunmap(page);
a52d9a80 1132 }
b888db2b 1133 set_page_dirty(page);
d1310b2e 1134 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
a52d9a80 1135
a52d9a80
CM		 1136 return ret;
1137}
1138
39279cc3
CM		 1139/*
1140 * taken from block_truncate_page, but does cow as it zeros out
1141 * any bytes left in the last page in the file.
1142 */
1143static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
1144{
1145 struct inode *inode = mapping->host;
db94535d
CM		 1146 struct btrfs_root *root = BTRFS_I(inode)->root;
1147 u32 blocksize = root->sectorsize;
39279cc3
CM		 1148 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1149 unsigned offset = from & (PAGE_CACHE_SIZE-1);
1150 struct page *page;
39279cc3 1151 int ret = 0;
a52d9a80 1152 u64 page_start;
39279cc3
CM		 1153
1154 if ((offset & (blocksize - 1)) == 0)
1155 goto out;
1156
1157 ret = -ENOMEM;
1158 page = grab_cache_page(mapping, index);
1159 if (!page)
1160 goto out;
39279cc3 1161 if (!PageUptodate(page)) {
9ebefb18 1162 ret = btrfs_readpage(NULL, page);
39279cc3
CM		 1163 lock_page(page);
1164 if (!PageUptodate(page)) {
1165 ret = -EIO;
1166 goto out;
1167 }
1168 }
35ebb934 1169 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 1170
b888db2b 1171 ret = btrfs_cow_one_page(inode, page, offset);
39279cc3 1172
39279cc3
CM		 1173 unlock_page(page);
1174 page_cache_release(page);
1175out:
1176 return ret;
1177}
1178
1179static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
1180{
1181 struct inode *inode = dentry->d_inode;
1182 int err;
1183
1184 err = inode_change_ok(inode, attr);
1185 if (err)
1186 return err;
1187
1188 if (S_ISREG(inode->i_mode) &&
1189 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
1190 struct btrfs_trans_handle *trans;
1191 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 1192 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2bf5a725 1193
5f39d397 1194 u64 mask = root->sectorsize - 1;
1b0f7c29 1195 u64 hole_start = (inode->i_size + mask) & ~mask;
f392a938 1196 u64 block_end = (attr->ia_size + mask) & ~mask;
39279cc3 1197 u64 hole_size;
179e29e4 1198 u64 alloc_hint = 0;
39279cc3 1199
1b0f7c29 1200 if (attr->ia_size <= hole_start)
39279cc3
CM		 1201 goto out;
1202
1832a6d5
CM		 1203 mutex_lock(&root->fs_info->fs_mutex);
1204 err = btrfs_check_free_space(root, 1, 0);
1205 mutex_unlock(&root->fs_info->fs_mutex);
1206 if (err)
1207 goto fail;
1208
39279cc3
CM		 1209 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1210
1b0f7c29 1211 lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
5f56406a 1212 hole_size = block_end - hole_start;
39279cc3
CM		 1213
1214 mutex_lock(&root->fs_info->fs_mutex);
1215 trans = btrfs_start_transaction(root, 1);
1216 btrfs_set_trans_block_group(trans, inode);
2bf5a725 1217 err = btrfs_drop_extents(trans, root, inode,
1b0f7c29 1218 hole_start, block_end, hole_start,
3326d1b0 1219 &alloc_hint);
2bf5a725 1220
179e29e4
CM		 1221 if (alloc_hint != EXTENT_MAP_INLINE) {
1222 err = btrfs_insert_file_extent(trans, root,
1223 inode->i_ino,
5f56406a
CM		 1224 hole_start, 0, 0,
1225 hole_size);
d1310b2e 1226 btrfs_drop_extent_cache(inode, hole_start,
3b951516 1227 (u64)-1);
5f56406a 1228 btrfs_check_file(root, inode);
179e29e4 1229 }
39279cc3
CM		 1230 btrfs_end_transaction(trans, root);
1231 mutex_unlock(&root->fs_info->fs_mutex);
1b0f7c29 1232 unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
54aa1f4d
CM		 1233 if (err)
1234 return err;
39279cc3
CM		 1235 }
1236out:
1237 err = inode_setattr(inode, attr);
1832a6d5 1238fail:
39279cc3
CM		 1239 return err;
1240}
61295eb8 1241
2da98f00 1242void btrfs_put_inode(struct inode *inode)
61295eb8 1243{
2da98f00
CM		 1244 int ret;
1245
1246 if (!BTRFS_I(inode)->ordered_trans) {
61295eb8
CM		 1247 return;
1248 }
2da98f00
CM		 1249
1250 if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
1251 mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))
1252 return;
1253
1254 ret = btrfs_del_ordered_inode(inode);
1255 if (ret == 1) {
1256 atomic_dec(&inode->i_count);
1257 }
61295eb8
CM		 1258}
1259
39279cc3
CM		 1260void btrfs_delete_inode(struct inode *inode)
1261{
1262 struct btrfs_trans_handle *trans;
1263 struct btrfs_root *root = BTRFS_I(inode)->root;
d3c2fdcf 1264 unsigned long nr;
39279cc3
CM		 1265 int ret;
1266
1267 truncate_inode_pages(&inode->i_data, 0);
1268 if (is_bad_inode(inode)) {
1269 goto no_delete;
1270 }
5f39d397 1271
39279cc3
CM		 1272 inode->i_size = 0;
1273 mutex_lock(&root->fs_info->fs_mutex);
1274 trans = btrfs_start_transaction(root, 1);
5f39d397 1275
39279cc3 1276 btrfs_set_trans_block_group(trans, inode);
85e21bac 1277 ret = btrfs_truncate_in_trans(trans, root, inode, 0);
54aa1f4d
CM		 1278 if (ret)
1279 goto no_delete_lock;
85e21bac 1280
d3c2fdcf 1281 nr = trans->blocks_used;
85e21bac 1282 clear_inode(inode);
5f39d397 1283
39279cc3
CM		 1284 btrfs_end_transaction(trans, root);
1285 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1286 btrfs_btree_balance_dirty(root, nr);
e2008b61 1287 btrfs_throttle(root);
39279cc3 1288 return;
54aa1f4d
CM		 1289
1290no_delete_lock:
d3c2fdcf 1291 nr = trans->blocks_used;
54aa1f4d
CM		 1292 btrfs_end_transaction(trans, root);
1293 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1294 btrfs_btree_balance_dirty(root, nr);
e2008b61 1295 btrfs_throttle(root);
39279cc3
CM		 1296no_delete:
1297 clear_inode(inode);
1298}
1299
1300/*
1301 * this returns the key found in the dir entry in the location pointer.
1302 * If no dir entries were found, location->objectid is 0.
1303 */
1304static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1305 struct btrfs_key *location)
1306{
1307 const char *name = dentry->d_name.name;
1308 int namelen = dentry->d_name.len;
1309 struct btrfs_dir_item *di;
1310 struct btrfs_path *path;
1311 struct btrfs_root *root = BTRFS_I(dir)->root;
0d9f7f3e 1312 int ret = 0;
39279cc3 1313
3954401f
CM		 1314 if (namelen == 1 && strcmp(name, ".") == 0) {
1315 location->objectid = dir->i_ino;
1316 location->type = BTRFS_INODE_ITEM_KEY;
1317 location->offset = 0;
1318 return 0;
1319 }
39279cc3
CM		 1320 path = btrfs_alloc_path();
1321 BUG_ON(!path);
3954401f 1322
7a720536 1323 if (namelen == 2 && strcmp(name, "..") == 0) {
3954401f
CM		 1324 struct btrfs_key key;
1325 struct extent_buffer *leaf;
1326 u32 nritems;
1327 int slot;
1328
1329 key.objectid = dir->i_ino;
1330 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1331 key.offset = 0;
1332 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1333 BUG_ON(ret == 0);
1334 ret = 0;
1335
1336 leaf = path->nodes[0];
1337 slot = path->slots[0];
1338 nritems = btrfs_header_nritems(leaf);
1339 if (slot >= nritems)
1340 goto out_err;
1341
1342 btrfs_item_key_to_cpu(leaf, &key, slot);
1343 if (key.objectid != dir->i_ino ||
1344 key.type != BTRFS_INODE_REF_KEY) {
1345 goto out_err;
1346 }
1347 location->objectid = key.offset;
1348 location->type = BTRFS_INODE_ITEM_KEY;
1349 location->offset = 0;
1350 goto out;
1351 }
1352
39279cc3
CM		 1353 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1354 namelen, 0);
0d9f7f3e
Y		 1355 if (IS_ERR(di))
1356 ret = PTR_ERR(di);
39279cc3 1357 if (!di || IS_ERR(di)) {
3954401f 1358 goto out_err;
39279cc3 1359 }
5f39d397 1360 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
39279cc3 1361out:
39279cc3
CM		 1362 btrfs_free_path(path);
1363 return ret;
3954401f
CM		 1364out_err:
1365 location->objectid = 0;
1366 goto out;
39279cc3
CM		 1367}
1368
1369/*
1370 * when we hit a tree root in a directory, the btrfs part of the inode
1371 * needs to be changed to reflect the root directory of the tree root. This
1372 * is kind of like crossing a mount point.
1373 */
1374static int fixup_tree_root_location(struct btrfs_root *root,
1375 struct btrfs_key *location,
58176a96
JB		 1376 struct btrfs_root **sub_root,
1377 struct dentry *dentry)
39279cc3
CM		 1378{
1379 struct btrfs_path *path;
1380 struct btrfs_root_item *ri;
1381
1382 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1383 return 0;
1384 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1385 return 0;
1386
1387 path = btrfs_alloc_path();
1388 BUG_ON(!path);
1389 mutex_lock(&root->fs_info->fs_mutex);
1390
58176a96
JB		 1391 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1392 dentry->d_name.name,
1393 dentry->d_name.len);
39279cc3
CM		 1394 if (IS_ERR(*sub_root))
1395 return PTR_ERR(*sub_root);
1396
1397 ri = &(*sub_root)->root_item;
1398 location->objectid = btrfs_root_dirid(ri);
39279cc3
CM		 1399 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1400 location->offset = 0;
1401
1402 btrfs_free_path(path);
1403 mutex_unlock(&root->fs_info->fs_mutex);
1404 return 0;
1405}
1406
1407static int btrfs_init_locked_inode(struct inode *inode, void *p)
1408{
1409 struct btrfs_iget_args *args = p;
1410 inode->i_ino = args->ino;
1411 BTRFS_I(inode)->root = args->root;
9069218d 1412 BTRFS_I(inode)->delalloc_bytes = 0;
d1310b2e
CM		 1413 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1414 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
b888db2b 1415 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 1416 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1417 inode->i_mapping, GFP_NOFS);
39279cc3
CM		 1418 return 0;
1419}
1420
1421static int btrfs_find_actor(struct inode *inode, void *opaque)
1422{
1423 struct btrfs_iget_args *args = opaque;
1424 return (args->ino == inode->i_ino &&
1425 args->root == BTRFS_I(inode)->root);
1426}
1427
dc17ff8f
CM		 1428struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1429 u64 root_objectid)
1430{
1431 struct btrfs_iget_args args;
1432 args.ino = objectid;
1433 args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);
1434
1435 if (!args.root)
1436 return NULL;
1437
1438 return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
1439}
1440
39279cc3
CM		 1441struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1442 struct btrfs_root *root)
1443{
1444 struct inode *inode;
1445 struct btrfs_iget_args args;
1446 args.ino = objectid;
1447 args.root = root;
1448
1449 inode = iget5_locked(s, objectid, btrfs_find_actor,
1450 btrfs_init_locked_inode,
1451 (void *)&args);
1452 return inode;
1453}
1454
1455static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1456 struct nameidata *nd)
1457{
1458 struct inode * inode;
1459 struct btrfs_inode *bi = BTRFS_I(dir);
1460 struct btrfs_root *root = bi->root;
1461 struct btrfs_root *sub_root = root;
1462 struct btrfs_key location;
1463 int ret;
1464
1465 if (dentry->d_name.len > BTRFS_NAME_LEN)
1466 return ERR_PTR(-ENAMETOOLONG);
5f39d397 1467
39279cc3
CM		 1468 mutex_lock(&root->fs_info->fs_mutex);
1469 ret = btrfs_inode_by_name(dir, dentry, &location);
1470 mutex_unlock(&root->fs_info->fs_mutex);
5f39d397 1471
39279cc3
CM		 1472 if (ret < 0)
1473 return ERR_PTR(ret);
5f39d397 1474
39279cc3
CM		 1475 inode = NULL;
1476 if (location.objectid) {
58176a96
JB		 1477 ret = fixup_tree_root_location(root, &location, &sub_root,
1478 dentry);
39279cc3
CM		 1479 if (ret < 0)
1480 return ERR_PTR(ret);
1481 if (ret > 0)
1482 return ERR_PTR(-ENOENT);
1483 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1484 sub_root);
1485 if (!inode)
1486 return ERR_PTR(-EACCES);
1487 if (inode->i_state & I_NEW) {
1488 /* the inode and parent dir are two different roots */
1489 if (sub_root != root) {
1490 igrab(inode);
1491 sub_root->inode = inode;
1492 }
1493 BTRFS_I(inode)->root = sub_root;
1494 memcpy(&BTRFS_I(inode)->location, &location,
1495 sizeof(location));
1496 btrfs_read_locked_inode(inode);
1497 unlock_new_inode(inode);
1498 }
1499 }
1500 return d_splice_alias(inode, dentry);
1501}
1502
39279cc3
CM		 1503static unsigned char btrfs_filetype_table[] = {
1504 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1505};
1506
1507static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1508{
6da6abae 1509 struct inode *inode = filp->f_dentry->d_inode;
39279cc3
CM		 1510 struct btrfs_root *root = BTRFS_I(inode)->root;
1511 struct btrfs_item *item;
1512 struct btrfs_dir_item *di;
1513 struct btrfs_key key;
5f39d397 1514 struct btrfs_key found_key;
39279cc3
CM		 1515 struct btrfs_path *path;
1516 int ret;
1517 u32 nritems;
5f39d397 1518 struct extent_buffer *leaf;
39279cc3
CM		 1519 int slot;
1520 int advance;
1521 unsigned char d_type;
1522 int over = 0;
1523 u32 di_cur;
1524 u32 di_total;
1525 u32 di_len;
1526 int key_type = BTRFS_DIR_INDEX_KEY;
5f39d397
CM		 1527 char tmp_name[32];
1528 char *name_ptr;
1529 int name_len;
39279cc3
CM		 1530
1531 /* FIXME, use a real flag for deciding about the key type */
1532 if (root->fs_info->tree_root == root)
1533 key_type = BTRFS_DIR_ITEM_KEY;
5f39d397 1534
3954401f
CM		 1535 /* special case for "." */
1536 if (filp->f_pos == 0) {
1537 over = filldir(dirent, ".", 1,
1538 1, inode->i_ino,
1539 DT_DIR);
1540 if (over)
1541 return 0;
1542 filp->f_pos = 1;
1543 }
1544
39279cc3
CM		 1545 mutex_lock(&root->fs_info->fs_mutex);
1546 key.objectid = inode->i_ino;
3954401f
CM		 1547 path = btrfs_alloc_path();
1548 path->reada = 2;
1549
1550 /* special case for .., just use the back ref */
1551 if (filp->f_pos == 1) {
1552 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1553 key.offset = 0;
1554 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1555 BUG_ON(ret == 0);
1556 leaf = path->nodes[0];
1557 slot = path->slots[0];
1558 nritems = btrfs_header_nritems(leaf);
1559 if (slot >= nritems) {
1560 btrfs_release_path(root, path);
1561 goto read_dir_items;
1562 }
1563 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1564 btrfs_release_path(root, path);
1565 if (found_key.objectid != key.objectid ||
1566 found_key.type != BTRFS_INODE_REF_KEY)
1567 goto read_dir_items;
1568 over = filldir(dirent, "..", 2,
1569 2, found_key.offset, DT_DIR);
1570 if (over)
1571 goto nopos;
1572 filp->f_pos = 2;
1573 }
1574
1575read_dir_items:
39279cc3
CM		 1576 btrfs_set_key_type(&key, key_type);
1577 key.offset = filp->f_pos;
5f39d397 1578
39279cc3
CM		 1579 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1580 if (ret < 0)
1581 goto err;
1582 advance = 0;
39279cc3 1583 while(1) {
5f39d397
CM		 1584 leaf = path->nodes[0];
1585 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1586 slot = path->slots[0];
1587 if (advance || slot >= nritems) {
1588 if (slot >= nritems -1) {
39279cc3
CM		 1589 ret = btrfs_next_leaf(root, path);
1590 if (ret)
1591 break;
5f39d397
CM		 1592 leaf = path->nodes[0];
1593 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1594 slot = path->slots[0];
1595 } else {
1596 slot++;
1597 path->slots[0]++;
1598 }
1599 }
1600 advance = 1;
5f39d397
CM		 1601 item = btrfs_item_nr(leaf, slot);
1602 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1603
1604 if (found_key.objectid != key.objectid)
39279cc3 1605 break;
5f39d397 1606 if (btrfs_key_type(&found_key) != key_type)
39279cc3 1607 break;
5f39d397 1608 if (found_key.offset < filp->f_pos)
39279cc3 1609 continue;
5f39d397
CM		 1610
1611 filp->f_pos = found_key.offset;
39279cc3
CM		 1612 advance = 1;
1613 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1614 di_cur = 0;
5f39d397 1615 di_total = btrfs_item_size(leaf, item);
39279cc3 1616 while(di_cur < di_total) {
5f39d397
CM		 1617 struct btrfs_key location;
1618
1619 name_len = btrfs_dir_name_len(leaf, di);
1620 if (name_len < 32) {
1621 name_ptr = tmp_name;
1622 } else {
1623 name_ptr = kmalloc(name_len, GFP_NOFS);
1624 BUG_ON(!name_ptr);
1625 }
1626 read_extent_buffer(leaf, name_ptr,
1627 (unsigned long)(di + 1), name_len);
1628
1629 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1630 btrfs_dir_item_key_to_cpu(leaf, di, &location);
5f39d397
CM		 1631 over = filldir(dirent, name_ptr, name_len,
1632 found_key.offset,
1633 location.objectid,
39279cc3 1634 d_type);
5f39d397
CM		 1635
1636 if (name_ptr != tmp_name)
1637 kfree(name_ptr);
1638
39279cc3
CM		 1639 if (over)
1640 goto nopos;
5103e947
JB		 1641 di_len = btrfs_dir_name_len(leaf, di) +
1642 btrfs_dir_data_len(leaf, di) +sizeof(*di);
39279cc3
CM		 1643 di_cur += di_len;
1644 di = (struct btrfs_dir_item *)((char *)di + di_len);
1645 }
1646 }
5e591a07
YZ		 1647 if (key_type == BTRFS_DIR_INDEX_KEY)
1648 filp->f_pos = INT_LIMIT(typeof(filp->f_pos));
1649 else
1650 filp->f_pos++;
39279cc3
CM		 1651nopos:
1652 ret = 0;
1653err:
1654 btrfs_release_path(root, path);
1655 btrfs_free_path(path);
1656 mutex_unlock(&root->fs_info->fs_mutex);
1657 return ret;
1658}
1659
1660int btrfs_write_inode(struct inode *inode, int wait)
1661{
1662 struct btrfs_root *root = BTRFS_I(inode)->root;
1663 struct btrfs_trans_handle *trans;
1664 int ret = 0;
1665
1666 if (wait) {
1667 mutex_lock(&root->fs_info->fs_mutex);
1668 trans = btrfs_start_transaction(root, 1);
1669 btrfs_set_trans_block_group(trans, inode);
1670 ret = btrfs_commit_transaction(trans, root);
1671 mutex_unlock(&root->fs_info->fs_mutex);
1672 }
1673 return ret;
1674}
1675
1676/*
54aa1f4d 1677 * This is somewhat expensive, updating the tree every time the
39279cc3
CM		 1678 * inode changes. But, it is most likely to find the inode in cache.
1679 * FIXME, needs more benchmarking...there are no reasons other than performance
1680 * to keep or drop this code.
1681 */
1682void btrfs_dirty_inode(struct inode *inode)
1683{
1684 struct btrfs_root *root = BTRFS_I(inode)->root;
1685 struct btrfs_trans_handle *trans;
1686
1687 mutex_lock(&root->fs_info->fs_mutex);
1688 trans = btrfs_start_transaction(root, 1);
1689 btrfs_set_trans_block_group(trans, inode);
1690 btrfs_update_inode(trans, root, inode);
1691 btrfs_end_transaction(trans, root);
1692 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 1693}
1694
1695static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1696 struct btrfs_root *root,
9c58309d
CM		 1697 const char *name, int name_len,
1698 u64 ref_objectid,
39279cc3
CM		 1699 u64 objectid,
1700 struct btrfs_block_group_cache *group,
1701 int mode)
1702{
1703 struct inode *inode;
5f39d397 1704 struct btrfs_inode_item *inode_item;
6324fbf3 1705 struct btrfs_block_group_cache *new_inode_group;
39279cc3 1706 struct btrfs_key *location;
5f39d397 1707 struct btrfs_path *path;
9c58309d
CM		 1708 struct btrfs_inode_ref *ref;
1709 struct btrfs_key key[2];
1710 u32 sizes[2];
1711 unsigned long ptr;
39279cc3
CM		 1712 int ret;
1713 int owner;
1714
5f39d397
CM		 1715 path = btrfs_alloc_path();
1716 BUG_ON(!path);
1717
39279cc3
CM		 1718 inode = new_inode(root->fs_info->sb);
1719 if (!inode)
1720 return ERR_PTR(-ENOMEM);
1721
d1310b2e
CM		 1722 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1723 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
b888db2b 1724 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 1725 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1726 inode->i_mapping, GFP_NOFS);
9069218d 1727 BTRFS_I(inode)->delalloc_bytes = 0;
39279cc3 1728 BTRFS_I(inode)->root = root;
b888db2b 1729
39279cc3
CM		 1730 if (mode & S_IFDIR)
1731 owner = 0;
1732 else
1733 owner = 1;
6324fbf3 1734 new_inode_group = btrfs_find_block_group(root, group, 0,
0b86a832 1735 BTRFS_BLOCK_GROUP_METADATA, owner);
6324fbf3
CM		 1736 if (!new_inode_group) {
1737 printk("find_block group failed\n");
1738 new_inode_group = group;
1739 }
1740 BTRFS_I(inode)->block_group = new_inode_group;
b98b6767 1741 BTRFS_I(inode)->flags = 0;
9c58309d
CM		 1742
1743 key[0].objectid = objectid;
1744 btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY);
1745 key[0].offset = 0;
1746
1747 key[1].objectid = objectid;
1748 btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY);
1749 key[1].offset = ref_objectid;
1750
1751 sizes[0] = sizeof(struct btrfs_inode_item);
1752 sizes[1] = name_len + sizeof(*ref);
1753
1754 ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2);
1755 if (ret != 0)
5f39d397
CM		 1756 goto fail;
1757
9c58309d
CM		 1758 if (objectid > root->highest_inode)
1759 root->highest_inode = objectid;
1760
39279cc3
CM		 1761 inode->i_uid = current->fsuid;
1762 inode->i_gid = current->fsgid;
1763 inode->i_mode = mode;
1764 inode->i_ino = objectid;
1765 inode->i_blocks = 0;
1766 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
5f39d397
CM		 1767 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1768 struct btrfs_inode_item);
1769 fill_inode_item(path->nodes[0], inode_item, inode);
9c58309d
CM		 1770
1771 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
1772 struct btrfs_inode_ref);
1773 btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
1774 ptr = (unsigned long)(ref + 1);
1775 write_extent_buffer(path->nodes[0], name, ptr, name_len);
1776
5f39d397
CM		 1777 btrfs_mark_buffer_dirty(path->nodes[0]);
1778 btrfs_free_path(path);
1779
39279cc3
CM		 1780 location = &BTRFS_I(inode)->location;
1781 location->objectid = objectid;
39279cc3
CM		 1782 location->offset = 0;
1783 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1784
39279cc3
CM		 1785 insert_inode_hash(inode);
1786 return inode;
5f39d397
CM		 1787fail:
1788 btrfs_free_path(path);
1789 return ERR_PTR(ret);
39279cc3
CM		 1790}
1791
1792static inline u8 btrfs_inode_type(struct inode *inode)
1793{
1794 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1795}
1796
1797static int btrfs_add_link(struct btrfs_trans_handle *trans,
9c58309d
CM		 1798 struct dentry *dentry, struct inode *inode,
1799 int add_backref)
39279cc3
CM		 1800{
1801 int ret;
1802 struct btrfs_key key;
1803 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
79c44584 1804 struct inode *parent_inode;
5f39d397 1805
39279cc3 1806 key.objectid = inode->i_ino;
39279cc3
CM		 1807 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1808 key.offset = 0;
1809
1810 ret = btrfs_insert_dir_item(trans, root,
1811 dentry->d_name.name, dentry->d_name.len,
1812 dentry->d_parent->d_inode->i_ino,
1813 &key, btrfs_inode_type(inode));
1814 if (ret == 0) {
9c58309d
CM		 1815 if (add_backref) {
1816 ret = btrfs_insert_inode_ref(trans, root,
1817 dentry->d_name.name,
1818 dentry->d_name.len,
1819 inode->i_ino,
1820 dentry->d_parent->d_inode->i_ino);
1821 }
79c44584
CM		 1822 parent_inode = dentry->d_parent->d_inode;
1823 parent_inode->i_size += dentry->d_name.len * 2;
1824 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
39279cc3
CM		 1825 ret = btrfs_update_inode(trans, root,
1826 dentry->d_parent->d_inode);
1827 }
1828 return ret;
1829}
1830
1831static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
9c58309d
CM		 1832 struct dentry *dentry, struct inode *inode,
1833 int backref)
39279cc3 1834{
9c58309d 1835 int err = btrfs_add_link(trans, dentry, inode, backref);
39279cc3
CM		 1836 if (!err) {
1837 d_instantiate(dentry, inode);
1838 return 0;
1839 }
1840 if (err > 0)
1841 err = -EEXIST;
1842 return err;
1843}
1844
618e21d5
JB		 1845static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1846 int mode, dev_t rdev)
1847{
1848 struct btrfs_trans_handle *trans;
1849 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1850 struct inode *inode = NULL;
618e21d5
JB		 1851 int err;
1852 int drop_inode = 0;
1853 u64 objectid;
1832a6d5 1854 unsigned long nr = 0;
618e21d5
JB		 1855
1856 if (!new_valid_dev(rdev))
1857 return -EINVAL;
1858
1859 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1860 err = btrfs_check_free_space(root, 1, 0);
1861 if (err)
1862 goto fail;
1863
618e21d5
JB		 1864 trans = btrfs_start_transaction(root, 1);
1865 btrfs_set_trans_block_group(trans, dir);
1866
1867 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1868 if (err) {
1869 err = -ENOSPC;
1870 goto out_unlock;
1871 }
1872
9c58309d
CM		 1873 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1874 dentry->d_name.len,
1875 dentry->d_parent->d_inode->i_ino, objectid,
618e21d5
JB		 1876 BTRFS_I(dir)->block_group, mode);
1877 err = PTR_ERR(inode);
1878 if (IS_ERR(inode))
1879 goto out_unlock;
1880
1881 btrfs_set_trans_block_group(trans, inode);
9c58309d 1882 err = btrfs_add_nondir(trans, dentry, inode, 0);
618e21d5
JB		 1883 if (err)
1884 drop_inode = 1;
1885 else {
1886 inode->i_op = &btrfs_special_inode_operations;
1887 init_special_inode(inode, inode->i_mode, rdev);
1b4ab1bb 1888 btrfs_update_inode(trans, root, inode);
618e21d5
JB		 1889 }
1890 dir->i_sb->s_dirt = 1;
1891 btrfs_update_inode_block_group(trans, inode);
1892 btrfs_update_inode_block_group(trans, dir);
1893out_unlock:
d3c2fdcf 1894 nr = trans->blocks_used;
618e21d5 1895 btrfs_end_transaction(trans, root);
1832a6d5 1896fail:
618e21d5
JB		 1897 mutex_unlock(&root->fs_info->fs_mutex);
1898
1899 if (drop_inode) {
1900 inode_dec_link_count(inode);
1901 iput(inode);
1902 }
d3c2fdcf 1903 btrfs_btree_balance_dirty(root, nr);
e2008b61 1904 btrfs_throttle(root);
618e21d5
JB		 1905 return err;
1906}
1907
39279cc3
CM		 1908static int btrfs_create(struct inode *dir, struct dentry *dentry,
1909 int mode, struct nameidata *nd)
1910{
1911 struct btrfs_trans_handle *trans;
1912 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1913 struct inode *inode = NULL;
39279cc3
CM		 1914 int err;
1915 int drop_inode = 0;
1832a6d5 1916 unsigned long nr = 0;
39279cc3
CM		 1917 u64 objectid;
1918
1919 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1920 err = btrfs_check_free_space(root, 1, 0);
1921 if (err)
1922 goto fail;
39279cc3
CM		 1923 trans = btrfs_start_transaction(root, 1);
1924 btrfs_set_trans_block_group(trans, dir);
1925
1926 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1927 if (err) {
1928 err = -ENOSPC;
1929 goto out_unlock;
1930 }
1931
9c58309d
CM		 1932 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1933 dentry->d_name.len,
1934 dentry->d_parent->d_inode->i_ino,
1935 objectid, BTRFS_I(dir)->block_group, mode);
39279cc3
CM		 1936 err = PTR_ERR(inode);
1937 if (IS_ERR(inode))
1938 goto out_unlock;
1939
1940 btrfs_set_trans_block_group(trans, inode);
9c58309d 1941 err = btrfs_add_nondir(trans, dentry, inode, 0);
39279cc3
CM		 1942 if (err)
1943 drop_inode = 1;
1944 else {
1945 inode->i_mapping->a_ops = &btrfs_aops;
04160088 1946 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3
CM		 1947 inode->i_fop = &btrfs_file_operations;
1948 inode->i_op = &btrfs_file_inode_operations;
d1310b2e
CM		 1949 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1950 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
a52d9a80 1951 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 1952 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1953 inode->i_mapping, GFP_NOFS);
9069218d 1954 BTRFS_I(inode)->delalloc_bytes = 0;
d1310b2e 1955 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 1956 }
1957 dir->i_sb->s_dirt = 1;
1958 btrfs_update_inode_block_group(trans, inode);
1959 btrfs_update_inode_block_group(trans, dir);
1960out_unlock:
d3c2fdcf 1961 nr = trans->blocks_used;
39279cc3 1962 btrfs_end_transaction(trans, root);
1832a6d5 1963fail:
39279cc3
CM		 1964 mutex_unlock(&root->fs_info->fs_mutex);
1965
1966 if (drop_inode) {
1967 inode_dec_link_count(inode);
1968 iput(inode);
1969 }
d3c2fdcf 1970 btrfs_btree_balance_dirty(root, nr);
e2008b61 1971 btrfs_throttle(root);
39279cc3
CM		 1972 return err;
1973}
1974
1975static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1976 struct dentry *dentry)
1977{
1978 struct btrfs_trans_handle *trans;
1979 struct btrfs_root *root = BTRFS_I(dir)->root;
1980 struct inode *inode = old_dentry->d_inode;
1832a6d5 1981 unsigned long nr = 0;
39279cc3
CM		 1982 int err;
1983 int drop_inode = 0;
1984
1985 if (inode->i_nlink == 0)
1986 return -ENOENT;
1987
6da6abae
CM		 1988#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1989 inode->i_nlink++;
1990#else
39279cc3 1991 inc_nlink(inode);
6da6abae 1992#endif
39279cc3 1993 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1994 err = btrfs_check_free_space(root, 1, 0);
1995 if (err)
1996 goto fail;
39279cc3 1997 trans = btrfs_start_transaction(root, 1);
5f39d397 1998
39279cc3
CM		 1999 btrfs_set_trans_block_group(trans, dir);
2000 atomic_inc(&inode->i_count);
9c58309d 2001 err = btrfs_add_nondir(trans, dentry, inode, 1);
5f39d397 2002
39279cc3
CM		 2003 if (err)
2004 drop_inode = 1;
5f39d397 2005
39279cc3
CM		 2006 dir->i_sb->s_dirt = 1;
2007 btrfs_update_inode_block_group(trans, dir);
54aa1f4d 2008 err = btrfs_update_inode(trans, root, inode);
5f39d397 2009
54aa1f4d
CM		 2010 if (err)
2011 drop_inode = 1;
39279cc3 2012
d3c2fdcf 2013 nr = trans->blocks_used;
39279cc3 2014 btrfs_end_transaction(trans, root);
1832a6d5 2015fail:
39279cc3
CM		 2016 mutex_unlock(&root->fs_info->fs_mutex);
2017
2018 if (drop_inode) {
2019 inode_dec_link_count(inode);
2020 iput(inode);
2021 }
d3c2fdcf 2022 btrfs_btree_balance_dirty(root, nr);
e2008b61 2023 btrfs_throttle(root);
39279cc3
CM		 2024 return err;
2025}
2026
39279cc3
CM		 2027static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
2028{
2029 struct inode *inode;
2030 struct btrfs_trans_handle *trans;
2031 struct btrfs_root *root = BTRFS_I(dir)->root;
2032 int err = 0;
2033 int drop_on_err = 0;
2034 u64 objectid;
d3c2fdcf 2035 unsigned long nr = 1;
39279cc3
CM		 2036
2037 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2038 err = btrfs_check_free_space(root, 1, 0);
2039 if (err)
2040 goto out_unlock;
2041
39279cc3
CM		 2042 trans = btrfs_start_transaction(root, 1);
2043 btrfs_set_trans_block_group(trans, dir);
5f39d397 2044
39279cc3
CM		 2045 if (IS_ERR(trans)) {
2046 err = PTR_ERR(trans);
2047 goto out_unlock;
2048 }
2049
2050 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2051 if (err) {
2052 err = -ENOSPC;
2053 goto out_unlock;
2054 }
2055
9c58309d
CM		 2056 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
2057 dentry->d_name.len,
2058 dentry->d_parent->d_inode->i_ino, objectid,
39279cc3
CM		 2059 BTRFS_I(dir)->block_group, S_IFDIR | mode);
2060 if (IS_ERR(inode)) {
2061 err = PTR_ERR(inode);
2062 goto out_fail;
2063 }
5f39d397 2064
39279cc3
CM		 2065 drop_on_err = 1;
2066 inode->i_op = &btrfs_dir_inode_operations;
2067 inode->i_fop = &btrfs_dir_file_operations;
2068 btrfs_set_trans_block_group(trans, inode);
2069
3954401f 2070 inode->i_size = 0;
39279cc3
CM		 2071 err = btrfs_update_inode(trans, root, inode);
2072 if (err)
2073 goto out_fail;
5f39d397 2074
9c58309d 2075 err = btrfs_add_link(trans, dentry, inode, 0);
39279cc3
CM		 2076 if (err)
2077 goto out_fail;
5f39d397 2078
39279cc3
CM		 2079 d_instantiate(dentry, inode);
2080 drop_on_err = 0;
2081 dir->i_sb->s_dirt = 1;
2082 btrfs_update_inode_block_group(trans, inode);
2083 btrfs_update_inode_block_group(trans, dir);
2084
2085out_fail:
d3c2fdcf 2086 nr = trans->blocks_used;
39279cc3 2087 btrfs_end_transaction(trans, root);
5f39d397 2088
39279cc3
CM		 2089out_unlock:
2090 mutex_unlock(&root->fs_info->fs_mutex);
2091 if (drop_on_err)
2092 iput(inode);
d3c2fdcf 2093 btrfs_btree_balance_dirty(root, nr);
e2008b61 2094 btrfs_throttle(root);
39279cc3
CM		 2095 return err;
2096}
2097
3b951516
CM		 2098static int merge_extent_mapping(struct extent_map_tree *em_tree,
2099 struct extent_map *existing,
2100 struct extent_map *em)
2101{
2102 u64 start_diff;
2103 u64 new_end;
2104 int ret = 0;
2105 int real_blocks = existing->block_start < EXTENT_MAP_LAST_BYTE;
2106
2107 if (real_blocks && em->block_start >= EXTENT_MAP_LAST_BYTE)
2108 goto invalid;
2109
2110 if (!real_blocks && em->block_start != existing->block_start)
2111 goto invalid;
2112
2113 new_end = max(existing->start + existing->len, em->start + em->len);
2114
2115 if (existing->start >= em->start) {
2116 if (em->start + em->len < existing->start)
2117 goto invalid;
2118
2119 start_diff = existing->start - em->start;
2120 if (real_blocks && em->block_start + start_diff !=
2121 existing->block_start)
2122 goto invalid;
2123
2124 em->len = new_end - em->start;
2125
2126 remove_extent_mapping(em_tree, existing);
2127 /* free for the tree */
2128 free_extent_map(existing);
2129 ret = add_extent_mapping(em_tree, em);
2130
2131 } else if (em->start > existing->start) {
2132
2133 if (existing->start + existing->len < em->start)
2134 goto invalid;
2135
2136 start_diff = em->start - existing->start;
2137 if (real_blocks && existing->block_start + start_diff !=
2138 em->block_start)
2139 goto invalid;
2140
2141 remove_extent_mapping(em_tree, existing);
2142 em->block_start = existing->block_start;
2143 em->start = existing->start;
2144 em->len = new_end - existing->start;
2145 free_extent_map(existing);
2146
2147 ret = add_extent_mapping(em_tree, em);
2148 } else {
2149 goto invalid;
2150 }
2151 return ret;
2152
2153invalid:
2154 printk("invalid extent map merge [%Lu %Lu %Lu] [%Lu %Lu %Lu]\n",
2155 existing->start, existing->len, existing->block_start,
2156 em->start, em->len, em->block_start);
2157 return -EIO;
2158}
2159
a52d9a80 2160struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
70dec807 2161 size_t pg_offset, u64 start, u64 len,
a52d9a80
CM		 2162 int create)
2163{
2164 int ret;
2165 int err = 0;
db94535d 2166 u64 bytenr;
a52d9a80
CM		 2167 u64 extent_start = 0;
2168 u64 extent_end = 0;
2169 u64 objectid = inode->i_ino;
2170 u32 found_type;
a52d9a80
CM		 2171 struct btrfs_path *path;
2172 struct btrfs_root *root = BTRFS_I(inode)->root;
2173 struct btrfs_file_extent_item *item;
5f39d397
CM		 2174 struct extent_buffer *leaf;
2175 struct btrfs_key found_key;
a52d9a80
CM		 2176 struct extent_map *em = NULL;
2177 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
d1310b2e 2178 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
a52d9a80
CM		 2179 struct btrfs_trans_handle *trans = NULL;
2180
2181 path = btrfs_alloc_path();
2182 BUG_ON(!path);
2183 mutex_lock(&root->fs_info->fs_mutex);
2184
2185again:
d1310b2e
CM		 2186 spin_lock(&em_tree->lock);
2187 em = lookup_extent_mapping(em_tree, start, len);
2188 spin_unlock(&em_tree->lock);
2189
a52d9a80 2190 if (em) {
e1c4b745
CM		 2191 if (em->start > start || em->start + em->len <= start)
2192 free_extent_map(em);
2193 else if (em->block_start == EXTENT_MAP_INLINE && page)
70dec807
CM		 2194 free_extent_map(em);
2195 else
2196 goto out;
a52d9a80 2197 }
d1310b2e 2198 em = alloc_extent_map(GFP_NOFS);
a52d9a80 2199 if (!em) {
d1310b2e
CM		 2200 err = -ENOMEM;
2201 goto out;
a52d9a80 2202 }
d1310b2e
CM		 2203
2204 em->start = EXTENT_MAP_HOLE;
2205 em->len = (u64)-1;
a52d9a80 2206 em->bdev = inode->i_sb->s_bdev;
179e29e4
CM		 2207 ret = btrfs_lookup_file_extent(trans, root, path,
2208 objectid, start, trans != NULL);
a52d9a80
CM		 2209 if (ret < 0) {
2210 err = ret;
2211 goto out;
2212 }
2213
2214 if (ret != 0) {
2215 if (path->slots[0] == 0)
2216 goto not_found;
2217 path->slots[0]--;
2218 }
2219
5f39d397
CM		 2220 leaf = path->nodes[0];
2221 item = btrfs_item_ptr(leaf, path->slots[0],
a52d9a80 2222 struct btrfs_file_extent_item);
a52d9a80 2223 /* are we inside the extent that was found? */
5f39d397
CM		 2224 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2225 found_type = btrfs_key_type(&found_key);
2226 if (found_key.objectid != objectid ||
a52d9a80
CM		 2227 found_type != BTRFS_EXTENT_DATA_KEY) {
2228 goto not_found;
2229 }
2230
5f39d397
CM		 2231 found_type = btrfs_file_extent_type(leaf, item);
2232 extent_start = found_key.offset;
a52d9a80
CM		 2233 if (found_type == BTRFS_FILE_EXTENT_REG) {
2234 extent_end = extent_start +
db94535d 2235 btrfs_file_extent_num_bytes(leaf, item);
a52d9a80 2236 err = 0;
b888db2b 2237 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 2238 em->start = start;
2239 if (start < extent_start) {
d1310b2e 2240 if (start + len <= extent_start)
b888db2b 2241 goto not_found;
d1310b2e 2242 em->len = extent_end - extent_start;
a52d9a80 2243 } else {
d1310b2e 2244 em->len = len;
a52d9a80
CM		 2245 }
2246 goto not_found_em;
2247 }
db94535d
CM		 2248 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
2249 if (bytenr == 0) {
a52d9a80 2250 em->start = extent_start;
d1310b2e 2251 em->len = extent_end - extent_start;
5f39d397 2252 em->block_start = EXTENT_MAP_HOLE;
a52d9a80
CM		 2253 goto insert;
2254 }
db94535d
CM		 2255 bytenr += btrfs_file_extent_offset(leaf, item);
2256 em->block_start = bytenr;
a52d9a80 2257 em->start = extent_start;
d1310b2e 2258 em->len = extent_end - extent_start;
a52d9a80
CM		 2259 goto insert;
2260 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
70dec807 2261 u64 page_start;
5f39d397 2262 unsigned long ptr;
a52d9a80 2263 char *map;
3326d1b0
CM		 2264 size_t size;
2265 size_t extent_offset;
2266 size_t copy_size;
a52d9a80 2267
5f39d397
CM		 2268 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
2269 path->slots[0]));
d1310b2e
CM		 2270 extent_end = (extent_start + size + root->sectorsize - 1) &
2271 ~((u64)root->sectorsize - 1);
b888db2b 2272 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 2273 em->start = start;
2274 if (start < extent_start) {
d1310b2e 2275 if (start + len <= extent_start)
b888db2b 2276 goto not_found;
d1310b2e 2277 em->len = extent_end - extent_start;
a52d9a80 2278 } else {
d1310b2e 2279 em->len = len;
a52d9a80
CM		 2280 }
2281 goto not_found_em;
2282 }
689f9346 2283 em->block_start = EXTENT_MAP_INLINE;
689f9346
Y		 2284
2285 if (!page) {
2286 em->start = extent_start;
d1310b2e 2287 em->len = size;
689f9346
Y		 2288 goto out;
2289 }
5f39d397 2290
70dec807
CM		 2291 page_start = page_offset(page) + pg_offset;
2292 extent_offset = page_start - extent_start;
2293 copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
3326d1b0 2294 size - extent_offset);
3326d1b0 2295 em->start = extent_start + extent_offset;
70dec807
CM		 2296 em->len = (copy_size + root->sectorsize - 1) &
2297 ~((u64)root->sectorsize - 1);
689f9346
Y		 2298 map = kmap(page);
2299 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
179e29e4 2300 if (create == 0 && !PageUptodate(page)) {
70dec807 2301 read_extent_buffer(leaf, map + pg_offset, ptr,
179e29e4
CM		 2302 copy_size);
2303 flush_dcache_page(page);
2304 } else if (create && PageUptodate(page)) {
2305 if (!trans) {
2306 kunmap(page);
2307 free_extent_map(em);
2308 em = NULL;
2309 btrfs_release_path(root, path);
2310 trans = btrfs_start_transaction(root, 1);
2311 goto again;
2312 }
70dec807 2313 write_extent_buffer(leaf, map + pg_offset, ptr,
179e29e4
CM		 2314 copy_size);
2315 btrfs_mark_buffer_dirty(leaf);
a52d9a80 2316 }
a52d9a80 2317 kunmap(page);
d1310b2e
CM		 2318 set_extent_uptodate(io_tree, em->start,
2319 extent_map_end(em) - 1, GFP_NOFS);
a52d9a80
CM		 2320 goto insert;
2321 } else {
2322 printk("unkknown found_type %d\n", found_type);
2323 WARN_ON(1);
2324 }
2325not_found:
2326 em->start = start;
d1310b2e 2327 em->len = len;
a52d9a80 2328not_found_em:
5f39d397 2329 em->block_start = EXTENT_MAP_HOLE;
a52d9a80
CM		 2330insert:
2331 btrfs_release_path(root, path);
d1310b2e
CM		 2332 if (em->start > start || extent_map_end(em) <= start) {
2333 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len);
a52d9a80
CM		 2334 err = -EIO;
2335 goto out;
2336 }
d1310b2e
CM		 2337
2338 err = 0;
2339 spin_lock(&em_tree->lock);
a52d9a80 2340 ret = add_extent_mapping(em_tree, em);
3b951516
CM		 2341 /* it is possible that someone inserted the extent into the tree
2342 * while we had the lock dropped. It is also possible that
2343 * an overlapping map exists in the tree
2344 */
a52d9a80 2345 if (ret == -EEXIST) {
3b951516
CM		 2346 struct extent_map *existing;
2347 existing = lookup_extent_mapping(em_tree, start, len);
e1c4b745
CM		 2348 if (existing && (existing->start > start ||
2349 existing->start + existing->len <= start)) {
2350 free_extent_map(existing);
2351 existing = NULL;
2352 }
3b951516
CM		 2353 if (!existing) {
2354 existing = lookup_extent_mapping(em_tree, em->start,
2355 em->len);
2356 if (existing) {
2357 err = merge_extent_mapping(em_tree, existing,
2358 em);
2359 free_extent_map(existing);
2360 if (err) {
2361 free_extent_map(em);
2362 em = NULL;
2363 }
2364 } else {
2365 err = -EIO;
2366 printk("failing to insert %Lu %Lu\n",
2367 start, len);
2368 free_extent_map(em);
2369 em = NULL;
2370 }
2371 } else {
2372 free_extent_map(em);
2373 em = existing;
a52d9a80 2374 }
a52d9a80 2375 }
d1310b2e 2376 spin_unlock(&em_tree->lock);
a52d9a80
CM		 2377out:
2378 btrfs_free_path(path);
2379 if (trans) {
2380 ret = btrfs_end_transaction(trans, root);
2381 if (!err)
2382 err = ret;
2383 }
2384 mutex_unlock(&root->fs_info->fs_mutex);
2385 if (err) {
2386 free_extent_map(em);
2387 WARN_ON(1);
2388 return ERR_PTR(err);
2389 }
2390 return em;
2391}
2392
e1c4b745 2393#if 0 /* waiting for O_DIRECT reads */
16432985
CM		 2394static int btrfs_get_block(struct inode *inode, sector_t iblock,
2395 struct buffer_head *bh_result, int create)
2396{
2397 struct extent_map *em;
2398 u64 start = (u64)iblock << inode->i_blkbits;
2399 struct btrfs_multi_bio *multi = NULL;
2400 struct btrfs_root *root = BTRFS_I(inode)->root;
2401 u64 len;
2402 u64 logical;
2403 u64 map_length;
2404 int ret = 0;
2405
2406 em = btrfs_get_extent(inode, NULL, 0, start, bh_result->b_size, 0);
2407
2408 if (!em || IS_ERR(em))
2409 goto out;
2410
e1c4b745 2411 if (em->start > start || em->start + em->len <= start) {
16432985 2412 goto out;
e1c4b745 2413 }
16432985
CM		 2414
2415 if (em->block_start == EXTENT_MAP_INLINE) {
2416 ret = -EINVAL;
2417 goto out;
2418 }
2419
e1c4b745
CM		 2420 len = em->start + em->len - start;
2421 len = min_t(u64, len, INT_LIMIT(typeof(bh_result->b_size)));
2422
16432985
CM		 2423 if (em->block_start == EXTENT_MAP_HOLE ||
2424 em->block_start == EXTENT_MAP_DELALLOC) {
e1c4b745 2425 bh_result->b_size = len;
16432985
CM		 2426 goto out;
2427 }
2428
16432985
CM		 2429 logical = start - em->start;
2430 logical = em->block_start + logical;
2431
2432 map_length = len;
2433 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
2434 logical, &map_length, &multi, 0);
2435 BUG_ON(ret);
2436 bh_result->b_blocknr = multi->stripes[0].physical >> inode->i_blkbits;
2437 bh_result->b_size = min(map_length, len);
e1c4b745 2438
16432985
CM		 2439 bh_result->b_bdev = multi->stripes[0].dev->bdev;
2440 set_buffer_mapped(bh_result);
2441 kfree(multi);
2442out:
2443 free_extent_map(em);
2444 return ret;
2445}
e1c4b745 2446#endif
16432985
CM		 2447
2448static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
2449 const struct iovec *iov, loff_t offset,
2450 unsigned long nr_segs)
2451{
e1c4b745
CM		 2452 return -EINVAL;
2453#if 0
16432985
CM		 2454 struct file *file = iocb->ki_filp;
2455 struct inode *inode = file->f_mapping->host;
2456
2457 if (rw == WRITE)
2458 return -EINVAL;
2459
2460 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
2461 offset, nr_segs, btrfs_get_block, NULL);
e1c4b745 2462#endif
16432985
CM		 2463}
2464
d396c6f5 2465static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
39279cc3 2466{
d396c6f5 2467 return extent_bmap(mapping, iblock, btrfs_get_extent);
39279cc3
CM		 2468}
2469
a52d9a80 2470int btrfs_readpage(struct file *file, struct page *page)
9ebefb18 2471{
d1310b2e
CM		 2472 struct extent_io_tree *tree;
2473 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80 2474 return extent_read_full_page(tree, page, btrfs_get_extent);
9ebefb18 2475}
1832a6d5 2476
a52d9a80 2477static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
39279cc3 2478{
d1310b2e 2479 struct extent_io_tree *tree;
b888db2b
CM		 2480
2481
2482 if (current->flags & PF_MEMALLOC) {
2483 redirty_page_for_writepage(wbc, page);
2484 unlock_page(page);
2485 return 0;
2486 }
d1310b2e 2487 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80 2488 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
9ebefb18
CM		 2489}
2490
b293f02e
CM		 2491static int btrfs_writepages(struct address_space *mapping,
2492 struct writeback_control *wbc)
2493{
d1310b2e
CM		 2494 struct extent_io_tree *tree;
2495 tree = &BTRFS_I(mapping->host)->io_tree;
b293f02e
CM		 2496 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2497}
2498
3ab2fb5a
CM		 2499static int
2500btrfs_readpages(struct file *file, struct address_space *mapping,
2501 struct list_head *pages, unsigned nr_pages)
2502{
d1310b2e
CM		 2503 struct extent_io_tree *tree;
2504 tree = &BTRFS_I(mapping->host)->io_tree;
3ab2fb5a
CM		 2505 return extent_readpages(tree, mapping, pages, nr_pages,
2506 btrfs_get_extent);
2507}
2508
70dec807 2509static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
9ebefb18 2510{
d1310b2e
CM		 2511 struct extent_io_tree *tree;
2512 struct extent_map_tree *map;
a52d9a80 2513 int ret;
8c2383c3 2514
d1310b2e
CM		 2515 tree = &BTRFS_I(page->mapping->host)->io_tree;
2516 map = &BTRFS_I(page->mapping->host)->extent_tree;
70dec807 2517 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
a52d9a80 2518 if (ret == 1) {
4ef64eae 2519 invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
a52d9a80
CM		 2520 ClearPagePrivate(page);
2521 set_page_private(page, 0);
2522 page_cache_release(page);
39279cc3 2523 }
a52d9a80 2524 return ret;
39279cc3
CM		 2525}
2526
a52d9a80 2527static void btrfs_invalidatepage(struct page *page, unsigned long offset)
39279cc3 2528{
d1310b2e 2529 struct extent_io_tree *tree;
39279cc3 2530
d1310b2e 2531 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80
CM		 2532 extent_invalidatepage(tree, page, offset);
2533 btrfs_releasepage(page, GFP_NOFS);
9ad6b7bc 2534 if (PagePrivate(page)) {
4ef64eae 2535 invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
9ad6b7bc
CM		 2536 ClearPagePrivate(page);
2537 set_page_private(page, 0);
2538 page_cache_release(page);
2539 }
39279cc3
CM		 2540}
2541
9ebefb18
CM		 2542/*
2543 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2544 * called from a page fault handler when a page is first dirtied. Hence we must
2545 * be careful to check for EOF conditions here. We set the page up correctly
2546 * for a written page which means we get ENOSPC checking when writing into
2547 * holes and correct delalloc and unwritten extent mapping on filesystems that
2548 * support these features.
2549 *
2550 * We are not allowed to take the i_mutex here so we have to play games to
2551 * protect against truncate races as the page could now be beyond EOF. Because
2552 * vmtruncate() writes the inode size before removing pages, once we have the
2553 * page lock we can determine safely if the page is beyond EOF. If it is not
2554 * beyond EOF, then the page is guaranteed safe against truncation until we
2555 * unlock the page.
2556 */
2557int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2558{
6da6abae 2559 struct inode *inode = fdentry(vma->vm_file)->d_inode;
1832a6d5 2560 struct btrfs_root *root = BTRFS_I(inode)->root;
9ebefb18
CM		 2561 unsigned long end;
2562 loff_t size;
1832a6d5 2563 int ret;
a52d9a80 2564 u64 page_start;
9ebefb18 2565
1832a6d5
CM		 2566 mutex_lock(&root->fs_info->fs_mutex);
2567 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
8f662a76 2568 mutex_unlock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2569 if (ret)
2570 goto out;
2571
2572 ret = -EINVAL;
2573
9ebefb18
CM		 2574 lock_page(page);
2575 wait_on_page_writeback(page);
9ebefb18 2576 size = i_size_read(inode);
35ebb934 2577 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 2578
9ebefb18 2579 if ((page->mapping != inode->i_mapping) ||
a52d9a80 2580 (page_start > size)) {
9ebefb18
CM		 2581 /* page got truncated out from underneath us */
2582 goto out_unlock;
2583 }
2584
2585 /* page is wholly or partially inside EOF */
a52d9a80 2586 if (page_start + PAGE_CACHE_SIZE > size)
9ebefb18
CM		 2587 end = size & ~PAGE_CACHE_MASK;
2588 else
2589 end = PAGE_CACHE_SIZE;
2590
b888db2b 2591 ret = btrfs_cow_one_page(inode, page, end);
9ebefb18
CM		 2592
2593out_unlock:
2594 unlock_page(page);
1832a6d5 2595out:
9ebefb18
CM		 2596 return ret;
2597}
2598
39279cc3
CM		 2599static void btrfs_truncate(struct inode *inode)
2600{
2601 struct btrfs_root *root = BTRFS_I(inode)->root;
2602 int ret;
2603 struct btrfs_trans_handle *trans;
d3c2fdcf 2604 unsigned long nr;
39279cc3
CM		 2605
2606 if (!S_ISREG(inode->i_mode))
2607 return;
2608 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2609 return;
2610
2611 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2612
2613 mutex_lock(&root->fs_info->fs_mutex);
2614 trans = btrfs_start_transaction(root, 1);
2615 btrfs_set_trans_block_group(trans, inode);
2616
2617 /* FIXME, add redo link to tree so we don't leak on crash */
85e21bac
CM		 2618 ret = btrfs_truncate_in_trans(trans, root, inode,
2619 BTRFS_EXTENT_DATA_KEY);
39279cc3 2620 btrfs_update_inode(trans, root, inode);
d3c2fdcf 2621 nr = trans->blocks_used;
5f39d397 2622
39279cc3
CM		 2623 ret = btrfs_end_transaction(trans, root);
2624 BUG_ON(ret);
2625 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2626 btrfs_btree_balance_dirty(root, nr);
e2008b61 2627 btrfs_throttle(root);
39279cc3
CM		 2628}
2629
4313b399
CM		 2630static int noinline create_subvol(struct btrfs_root *root, char *name,
2631 int namelen)
39279cc3
CM		 2632{
2633 struct btrfs_trans_handle *trans;
2634 struct btrfs_key key;
2635 struct btrfs_root_item root_item;
2636 struct btrfs_inode_item *inode_item;
5f39d397 2637 struct extent_buffer *leaf;
dc17ff8f 2638 struct btrfs_root *new_root = root;
39279cc3
CM		 2639 struct inode *inode;
2640 struct inode *dir;
2641 int ret;
54aa1f4d 2642 int err;
39279cc3
CM		 2643 u64 objectid;
2644 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
d3c2fdcf 2645 unsigned long nr = 1;
39279cc3
CM		 2646
2647 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2648 ret = btrfs_check_free_space(root, 1, 0);
2649 if (ret)
2650 goto fail_commit;
2651
39279cc3
CM		 2652 trans = btrfs_start_transaction(root, 1);
2653 BUG_ON(!trans);
2654
7bb86316
CM		 2655 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2656 0, &objectid);
2657 if (ret)
2658 goto fail;
2659
2660 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2661 objectid, trans->transid, 0, 0,
2662 0, 0);
5f39d397
CM		 2663 if (IS_ERR(leaf))
2664 return PTR_ERR(leaf);
2665
2666 btrfs_set_header_nritems(leaf, 0);
2667 btrfs_set_header_level(leaf, 0);
db94535d 2668 btrfs_set_header_bytenr(leaf, leaf->start);
5f39d397 2669 btrfs_set_header_generation(leaf, trans->transid);
7bb86316
CM		 2670 btrfs_set_header_owner(leaf, objectid);
2671
5f39d397
CM		 2672 write_extent_buffer(leaf, root->fs_info->fsid,
2673 (unsigned long)btrfs_header_fsid(leaf),
2674 BTRFS_FSID_SIZE);
2675 btrfs_mark_buffer_dirty(leaf);
39279cc3
CM		 2676
2677 inode_item = &root_item.inode;
2678 memset(inode_item, 0, sizeof(*inode_item));
5f39d397
CM		 2679 inode_item->generation = cpu_to_le64(1);
2680 inode_item->size = cpu_to_le64(3);
2681 inode_item->nlink = cpu_to_le32(1);
2682 inode_item->nblocks = cpu_to_le64(1);
2683 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
39279cc3 2684
db94535d
CM		 2685 btrfs_set_root_bytenr(&root_item, leaf->start);
2686 btrfs_set_root_level(&root_item, 0);
39279cc3 2687 btrfs_set_root_refs(&root_item, 1);
5f39d397
CM		 2688 btrfs_set_root_used(&root_item, 0);
2689
5eda7b5e
CM		 2690 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2691 root_item.drop_level = 0;
5f39d397
CM		 2692
2693 free_extent_buffer(leaf);
2694 leaf = NULL;
39279cc3 2695
39279cc3
CM		 2696 btrfs_set_root_dirid(&root_item, new_dirid);
2697
2698 key.objectid = objectid;
2699 key.offset = 1;
39279cc3
CM		 2700 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2701 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2702 &root_item);
54aa1f4d
CM		 2703 if (ret)
2704 goto fail;
39279cc3
CM		 2705
2706 /*
2707 * insert the directory item
2708 */
2709 key.offset = (u64)-1;
2710 dir = root->fs_info->sb->s_root->d_inode;
2711 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2712 name, namelen, dir->i_ino, &key,
2713 BTRFS_FT_DIR);
54aa1f4d
CM		 2714 if (ret)
2715 goto fail;
39279cc3 2716
3954401f
CM		 2717 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2718 name, namelen, objectid,
2719 root->fs_info->sb->s_root->d_inode->i_ino);
2720 if (ret)
2721 goto fail;
2722
39279cc3 2723 ret = btrfs_commit_transaction(trans, root);
54aa1f4d
CM		 2724 if (ret)
2725 goto fail_commit;
39279cc3 2726
58176a96 2727 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
39279cc3
CM		 2728 BUG_ON(!new_root);
2729
2730 trans = btrfs_start_transaction(new_root, 1);
2731 BUG_ON(!trans);
2732
9c58309d
CM		 2733 inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid,
2734 new_dirid,
39279cc3 2735 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
54aa1f4d
CM		 2736 if (IS_ERR(inode))
2737 goto fail;
39279cc3
CM		 2738 inode->i_op = &btrfs_dir_inode_operations;
2739 inode->i_fop = &btrfs_dir_file_operations;
34088780 2740 new_root->inode = inode;
39279cc3 2741
3954401f
CM		 2742 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2743 new_dirid);
39279cc3 2744 inode->i_nlink = 1;
3954401f 2745 inode->i_size = 0;
39279cc3 2746 ret = btrfs_update_inode(trans, new_root, inode);
54aa1f4d
CM		 2747 if (ret)
2748 goto fail;
2749fail:
d3c2fdcf 2750 nr = trans->blocks_used;
dc17ff8f 2751 err = btrfs_commit_transaction(trans, new_root);
54aa1f4d
CM		 2752 if (err && !ret)
2753 ret = err;
2754fail_commit:
39279cc3 2755 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2756 btrfs_btree_balance_dirty(root, nr);
e2008b61 2757 btrfs_throttle(root);
54aa1f4d 2758 return ret;
39279cc3
CM		 2759}
2760
2761static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2762{
3063d29f 2763 struct btrfs_pending_snapshot *pending_snapshot;
39279cc3 2764 struct btrfs_trans_handle *trans;
39279cc3 2765 int ret;
54aa1f4d 2766 int err;
1832a6d5 2767 unsigned long nr = 0;
39279cc3
CM		 2768
2769 if (!root->ref_cows)
2770 return -EINVAL;
2771
2772 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2773 ret = btrfs_check_free_space(root, 1, 0);
2774 if (ret)
2775 goto fail_unlock;
2776
3063d29f
CM		 2777 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
2778 if (!pending_snapshot) {
2779 ret = -ENOMEM;
2780 goto fail_unlock;
2781 }
fb4bc1e0 2782 pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
3063d29f
CM		 2783 if (!pending_snapshot->name) {
2784 ret = -ENOMEM;
2785 kfree(pending_snapshot);
2786 goto fail_unlock;
2787 }
fb4bc1e0
Y		 2788 memcpy(pending_snapshot->name, name, namelen);
2789 pending_snapshot->name[namelen] = '\0';
39279cc3
CM		 2790 trans = btrfs_start_transaction(root, 1);
2791 BUG_ON(!trans);
3063d29f
CM		 2792 pending_snapshot->root = root;
2793 list_add(&pending_snapshot->list,
2794 &trans->transaction->pending_snapshots);
39279cc3 2795 ret = btrfs_update_inode(trans, root, root->inode);
54aa1f4d 2796 err = btrfs_commit_transaction(trans, root);
5f39d397 2797
1832a6d5 2798fail_unlock:
39279cc3 2799 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2800 btrfs_btree_balance_dirty(root, nr);
e2008b61 2801 btrfs_throttle(root);
54aa1f4d 2802 return ret;
39279cc3
CM		 2803}
2804
edbd8d4e 2805unsigned long btrfs_force_ra(struct address_space *mapping,
86479a04
CM		 2806 struct file_ra_state *ra, struct file *file,
2807 pgoff_t offset, pgoff_t last_index)
2808{
2809 pgoff_t req_size;
2810
2811#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2812 req_size = last_index - offset + 1;
2813 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2814 return offset;
2815#else
2816 req_size = min(last_index - offset + 1, (pgoff_t)128);
2817 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2818 return offset + req_size;
2819#endif
2820}
2821
2822int btrfs_defrag_file(struct file *file) {
6da6abae 2823 struct inode *inode = fdentry(file)->d_inode;
1832a6d5 2824 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 2825 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
86479a04
CM		 2826 struct page *page;
2827 unsigned long last_index;
2828 unsigned long ra_index = 0;
2829 u64 page_start;
2830 u64 page_end;
2831 unsigned long i;
1832a6d5
CM		 2832 int ret;
2833
2834 mutex_lock(&root->fs_info->fs_mutex);
2835 ret = btrfs_check_free_space(root, inode->i_size, 0);
2836 mutex_unlock(&root->fs_info->fs_mutex);
2837 if (ret)
2838 return -ENOSPC;
86479a04
CM		 2839
2840 mutex_lock(&inode->i_mutex);
2841 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2842 for (i = 0; i <= last_index; i++) {
2843 if (i == ra_index) {
edbd8d4e
CM		 2844 ra_index = btrfs_force_ra(inode->i_mapping,
2845 &file->f_ra,
2846 file, ra_index, last_index);
86479a04
CM		 2847 }
2848 page = grab_cache_page(inode->i_mapping, i);
2849 if (!page)
2850 goto out_unlock;
2851 if (!PageUptodate(page)) {
2852 btrfs_readpage(NULL, page);
2853 lock_page(page);
2854 if (!PageUptodate(page)) {
2855 unlock_page(page);
2856 page_cache_release(page);
2857 goto out_unlock;
2858 }
2859 }
35ebb934 2860 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
86479a04
CM		 2861 page_end = page_start + PAGE_CACHE_SIZE - 1;
2862
d1310b2e 2863 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
d1310b2e 2864 set_extent_delalloc(io_tree, page_start,
86479a04 2865 page_end, GFP_NOFS);
edbd8d4e 2866
d1310b2e 2867 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
86479a04
CM		 2868 set_page_dirty(page);
2869 unlock_page(page);
2870 page_cache_release(page);
2871 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2872 }
2873
2874out_unlock:
2875 mutex_unlock(&inode->i_mutex);
2876 return 0;
2877}
2878
edbd8d4e
CM		 2879static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2880{
2881 u64 new_size;
2882 u64 old_size;
2883 struct btrfs_ioctl_vol_args *vol_args;
2884 struct btrfs_trans_handle *trans;
2885 char *sizestr;
2886 int ret = 0;
2887 int namelen;
2888 int mod = 0;
2889
2890 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2891
2892 if (!vol_args)
2893 return -ENOMEM;
2894
2895 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2896 ret = -EFAULT;
2897 goto out;
2898 }
2899 namelen = strlen(vol_args->name);
2900 if (namelen > BTRFS_VOL_NAME_MAX) {
2901 ret = -EINVAL;
2902 goto out;
2903 }
2904
2905 sizestr = vol_args->name;
2906 if (!strcmp(sizestr, "max"))
2907 new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
2908 else {
2909 if (sizestr[0] == '-') {
2910 mod = -1;
2911 sizestr++;
2912 } else if (sizestr[0] == '+') {
2913 mod = 1;
2914 sizestr++;
2915 }
2916 new_size = btrfs_parse_size(sizestr);
2917 if (new_size == 0) {
2918 ret = -EINVAL;
2919 goto out;
2920 }
2921 }
2922
2923 mutex_lock(&root->fs_info->fs_mutex);
2924 old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);
2925
2926 if (mod < 0) {
2927 if (new_size > old_size) {
2928 ret = -EINVAL;
2929 goto out_unlock;
2930 }
2931 new_size = old_size - new_size;
2932 } else if (mod > 0) {
2933 new_size = old_size + new_size;
2934 }
2935
2936 if (new_size < 256 * 1024 * 1024) {
2937 ret = -EINVAL;
2938 goto out_unlock;
2939 }
2940 if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
2941 ret = -EFBIG;
2942 goto out_unlock;
2943 }
f9ef6604
CM		 2944
2945 do_div(new_size, root->sectorsize);
2946 new_size *= root->sectorsize;
edbd8d4e
CM		 2947
2948printk("new size is %Lu\n", new_size);
2949 if (new_size > old_size) {
2950 trans = btrfs_start_transaction(root, 1);
2951 ret = btrfs_grow_extent_tree(trans, root, new_size);
2952 btrfs_commit_transaction(trans, root);
2953 } else {
2954 ret = btrfs_shrink_extent_tree(root, new_size);
2955 }
2956
2957out_unlock:
2958 mutex_unlock(&root->fs_info->fs_mutex);
2959out:
2960 kfree(vol_args);
2961 return ret;
2962}
2963
4313b399
CM		 2964static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
2965 void __user *arg)
39279cc3 2966{
4aec2b52 2967 struct btrfs_ioctl_vol_args *vol_args;
39279cc3 2968 struct btrfs_dir_item *di;
39279cc3
CM		 2969 struct btrfs_path *path;
2970 u64 root_dirid;
4aec2b52
CM		 2971 int namelen;
2972 int ret;
39279cc3 2973
4aec2b52 2974 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
5f39d397 2975
4aec2b52
CM		 2976 if (!vol_args)
2977 return -ENOMEM;
2978
2979 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2980 ret = -EFAULT;
2981 goto out;
2982 }
2983
2984 namelen = strlen(vol_args->name);
2985 if (namelen > BTRFS_VOL_NAME_MAX) {
2986 ret = -EINVAL;
2987 goto out;
2988 }
2989 if (strchr(vol_args->name, '/')) {
2990 ret = -EINVAL;
2991 goto out;
2992 }
d03581f4
CH		 2993
2994 path = btrfs_alloc_path();
4aec2b52
CM		 2995 if (!path) {
2996 ret = -ENOMEM;
2997 goto out;
2998 }
d03581f4
CH		 2999
3000 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
3001 mutex_lock(&root->fs_info->fs_mutex);
3002 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
3003 path, root_dirid,
4aec2b52 3004 vol_args->name, namelen, 0);
d03581f4
CH		 3005 mutex_unlock(&root->fs_info->fs_mutex);
3006 btrfs_free_path(path);
4aec2b52
CM		 3007
3008 if (di && !IS_ERR(di)) {
3009 ret = -EEXIST;
3010 goto out;
3011 }
3012
3013 if (IS_ERR(di)) {
3014 ret = PTR_ERR(di);
3015 goto out;
3016 }
d03581f4
CH		 3017
3018 if (root == root->fs_info->tree_root)
4aec2b52
CM		 3019 ret = create_subvol(root, vol_args->name, namelen);
3020 else
3021 ret = create_snapshot(root, vol_args->name, namelen);
3022out:
3023 kfree(vol_args);
3024 return ret;
d03581f4
CH		 3025}
3026
3027static int btrfs_ioctl_defrag(struct file *file)
3028{
6da6abae 3029 struct inode *inode = fdentry(file)->d_inode;
d03581f4
CH		 3030 struct btrfs_root *root = BTRFS_I(inode)->root;
3031
3032 switch (inode->i_mode & S_IFMT) {
3033 case S_IFDIR:
39279cc3 3034 mutex_lock(&root->fs_info->fs_mutex);
d03581f4
CH		 3035 btrfs_defrag_root(root, 0);
3036 btrfs_defrag_root(root->fs_info->extent_root, 0);
39279cc3 3037 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3 3038 break;
d03581f4
CH		 3039 case S_IFREG:
3040 btrfs_defrag_file(file);
3041 break;
3042 }
3043
3044 return 0;
3045}
6702ed49 3046
d03581f4
CH		 3047long btrfs_ioctl(struct file *file, unsigned int
3048 cmd, unsigned long arg)
3049{
6da6abae 3050 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
d03581f4
CH		 3051
3052 switch (cmd) {
3053 case BTRFS_IOC_SNAP_CREATE:
3054 return btrfs_ioctl_snap_create(root, (void __user *)arg);
6702ed49 3055 case BTRFS_IOC_DEFRAG:
d03581f4 3056 return btrfs_ioctl_defrag(file);
edbd8d4e
CM		 3057 case BTRFS_IOC_RESIZE:
3058 return btrfs_ioctl_resize(root, (void __user *)arg);
39279cc3 3059 }
d03581f4
CH		 3060
3061 return -ENOTTY;
39279cc3
CM		 3062}
3063
39279cc3
CM		 3064/*
3065 * Called inside transaction, so use GFP_NOFS
3066 */
3067struct inode *btrfs_alloc_inode(struct super_block *sb)
3068{
3069 struct btrfs_inode *ei;
3070
3071 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
3072 if (!ei)
3073 return NULL;
15ee9bc7 3074 ei->last_trans = 0;
dc17ff8f 3075 ei->ordered_trans = 0;
39279cc3
CM		 3076 return &ei->vfs_inode;
3077}
3078
3079void btrfs_destroy_inode(struct inode *inode)
3080{
3081 WARN_ON(!list_empty(&inode->i_dentry));
3082 WARN_ON(inode->i_data.nrpages);
3083
8c416c9e 3084 btrfs_drop_extent_cache(inode, 0, (u64)-1);
39279cc3
CM		 3085 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
3086}
3087
44ec0b71
CM		 3088#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
3089static void init_once(struct kmem_cache * cachep, void *foo)
3090#else
39279cc3
CM		 3091static void init_once(void * foo, struct kmem_cache * cachep,
3092 unsigned long flags)
44ec0b71 3093#endif
39279cc3
CM		 3094{
3095 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
3096
3097 inode_init_once(&ei->vfs_inode);
3098}
3099
3100void btrfs_destroy_cachep(void)
3101{
3102 if (btrfs_inode_cachep)
3103 kmem_cache_destroy(btrfs_inode_cachep);
3104 if (btrfs_trans_handle_cachep)
3105 kmem_cache_destroy(btrfs_trans_handle_cachep);
3106 if (btrfs_transaction_cachep)
3107 kmem_cache_destroy(btrfs_transaction_cachep);
3108 if (btrfs_bit_radix_cachep)
3109 kmem_cache_destroy(btrfs_bit_radix_cachep);
3110 if (btrfs_path_cachep)
3111 kmem_cache_destroy(btrfs_path_cachep);
3112}
3113
86479a04 3114struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
92fee66d 3115 unsigned long extra_flags,
44ec0b71
CM		 3116#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
3117 void (*ctor)(struct kmem_cache *, void *)
3118#else
92fee66d 3119 void (*ctor)(void *, struct kmem_cache *,
44ec0b71
CM		 3120 unsigned long)
3121#endif
3122 )
92fee66d
CM		 3123{
3124 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
3125 SLAB_MEM_SPREAD | extra_flags), ctor
3126#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
3127 ,NULL
3128#endif
3129 );
3130}
3131
39279cc3
CM		 3132int btrfs_init_cachep(void)
3133{
86479a04 3134 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
92fee66d
CM		 3135 sizeof(struct btrfs_inode),
3136 0, init_once);
39279cc3
CM		 3137 if (!btrfs_inode_cachep)
3138 goto fail;
86479a04
CM		 3139 btrfs_trans_handle_cachep =
3140 btrfs_cache_create("btrfs_trans_handle_cache",
3141 sizeof(struct btrfs_trans_handle),
3142 0, NULL);
39279cc3
CM		 3143 if (!btrfs_trans_handle_cachep)
3144 goto fail;
86479a04 3145 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
39279cc3 3146 sizeof(struct btrfs_transaction),
92fee66d 3147 0, NULL);
39279cc3
CM		 3148 if (!btrfs_transaction_cachep)
3149 goto fail;
86479a04 3150 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
23223584 3151 sizeof(struct btrfs_path),
92fee66d 3152 0, NULL);
39279cc3
CM		 3153 if (!btrfs_path_cachep)
3154 goto fail;
86479a04 3155 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
92fee66d 3156 SLAB_DESTROY_BY_RCU, NULL);
39279cc3
CM		 3157 if (!btrfs_bit_radix_cachep)
3158 goto fail;
3159 return 0;
3160fail:
3161 btrfs_destroy_cachep();
3162 return -ENOMEM;
3163}
3164
3165static int btrfs_getattr(struct vfsmount *mnt,
3166 struct dentry *dentry, struct kstat *stat)
3167{
3168 struct inode *inode = dentry->d_inode;
3169 generic_fillattr(inode, stat);
d6667462 3170 stat->blksize = PAGE_CACHE_SIZE;
9069218d 3171 stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9);
39279cc3
CM		 3172 return 0;
3173}
3174
3175static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
3176 struct inode * new_dir,struct dentry *new_dentry)
3177{
3178 struct btrfs_trans_handle *trans;
3179 struct btrfs_root *root = BTRFS_I(old_dir)->root;
3180 struct inode *new_inode = new_dentry->d_inode;
3181 struct inode *old_inode = old_dentry->d_inode;
3182 struct timespec ctime = CURRENT_TIME;
3183 struct btrfs_path *path;
39279cc3
CM		 3184 int ret;
3185
3186 if (S_ISDIR(old_inode->i_mode) && new_inode &&
3187 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
3188 return -ENOTEMPTY;
3189 }
5f39d397 3190
39279cc3 3191 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 3192 ret = btrfs_check_free_space(root, 1, 0);
3193 if (ret)
3194 goto out_unlock;
3195
39279cc3 3196 trans = btrfs_start_transaction(root, 1);
5f39d397 3197
39279cc3
CM		 3198 btrfs_set_trans_block_group(trans, new_dir);
3199 path = btrfs_alloc_path();
3200 if (!path) {
3201 ret = -ENOMEM;
3202 goto out_fail;
3203 }
3204
3205 old_dentry->d_inode->i_nlink++;
3206 old_dir->i_ctime = old_dir->i_mtime = ctime;
3207 new_dir->i_ctime = new_dir->i_mtime = ctime;
3208 old_inode->i_ctime = ctime;
5f39d397 3209
39279cc3
CM		 3210 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
3211 if (ret)
3212 goto out_fail;
3213
3214 if (new_inode) {
3215 new_inode->i_ctime = CURRENT_TIME;
3216 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
3217 if (ret)
3218 goto out_fail;
39279cc3 3219 }
9c58309d 3220 ret = btrfs_add_link(trans, new_dentry, old_inode, 1);
39279cc3
CM		 3221 if (ret)
3222 goto out_fail;
3223
3224out_fail:
3225 btrfs_free_path(path);
3226 btrfs_end_transaction(trans, root);
1832a6d5 3227out_unlock:
39279cc3
CM		 3228 mutex_unlock(&root->fs_info->fs_mutex);
3229 return ret;
3230}
3231
3232static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
3233 const char *symname)
3234{
3235 struct btrfs_trans_handle *trans;
3236 struct btrfs_root *root = BTRFS_I(dir)->root;
3237 struct btrfs_path *path;
3238 struct btrfs_key key;
1832a6d5 3239 struct inode *inode = NULL;
39279cc3
CM		 3240 int err;
3241 int drop_inode = 0;
3242 u64 objectid;
3243 int name_len;
3244 int datasize;
5f39d397 3245 unsigned long ptr;
39279cc3 3246 struct btrfs_file_extent_item *ei;
5f39d397 3247 struct extent_buffer *leaf;
1832a6d5 3248 unsigned long nr = 0;
39279cc3
CM		 3249
3250 name_len = strlen(symname) + 1;
3251 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
3252 return -ENAMETOOLONG;
1832a6d5 3253
39279cc3 3254 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 3255 err = btrfs_check_free_space(root, 1, 0);
3256 if (err)
3257 goto out_fail;
3258
39279cc3
CM		 3259 trans = btrfs_start_transaction(root, 1);
3260 btrfs_set_trans_block_group(trans, dir);
3261
3262 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
3263 if (err) {
3264 err = -ENOSPC;
3265 goto out_unlock;
3266 }
3267
9c58309d
CM		 3268 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
3269 dentry->d_name.len,
3270 dentry->d_parent->d_inode->i_ino, objectid,
39279cc3
CM		 3271 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
3272 err = PTR_ERR(inode);
3273 if (IS_ERR(inode))
3274 goto out_unlock;
3275
3276 btrfs_set_trans_block_group(trans, inode);
9c58309d 3277 err = btrfs_add_nondir(trans, dentry, inode, 0);
39279cc3
CM		 3278 if (err)
3279 drop_inode = 1;
3280 else {
3281 inode->i_mapping->a_ops = &btrfs_aops;
04160088 3282 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3
CM		 3283 inode->i_fop = &btrfs_file_operations;
3284 inode->i_op = &btrfs_file_inode_operations;
d1310b2e
CM		 3285 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
3286 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
a52d9a80 3287 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 3288 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
3289 inode->i_mapping, GFP_NOFS);
9069218d 3290 BTRFS_I(inode)->delalloc_bytes = 0;
d1310b2e 3291 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 3292 }
3293 dir->i_sb->s_dirt = 1;
3294 btrfs_update_inode_block_group(trans, inode);
3295 btrfs_update_inode_block_group(trans, dir);
3296 if (drop_inode)
3297 goto out_unlock;
3298
3299 path = btrfs_alloc_path();
3300 BUG_ON(!path);
3301 key.objectid = inode->i_ino;
3302 key.offset = 0;
39279cc3
CM		 3303 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
3304 datasize = btrfs_file_extent_calc_inline_size(name_len);
3305 err = btrfs_insert_empty_item(trans, root, path, &key,
3306 datasize);
54aa1f4d
CM		 3307 if (err) {
3308 drop_inode = 1;
3309 goto out_unlock;
3310 }
5f39d397
CM		 3311 leaf = path->nodes[0];
3312 ei = btrfs_item_ptr(leaf, path->slots[0],
3313 struct btrfs_file_extent_item);
3314 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
3315 btrfs_set_file_extent_type(leaf, ei,
39279cc3
CM		 3316 BTRFS_FILE_EXTENT_INLINE);
3317 ptr = btrfs_file_extent_inline_start(ei);
5f39d397
CM		 3318 write_extent_buffer(leaf, symname, ptr, name_len);
3319 btrfs_mark_buffer_dirty(leaf);
39279cc3 3320 btrfs_free_path(path);
5f39d397 3321
39279cc3
CM		 3322 inode->i_op = &btrfs_symlink_inode_operations;
3323 inode->i_mapping->a_ops = &btrfs_symlink_aops;
04160088 3324 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3 3325 inode->i_size = name_len - 1;
54aa1f4d
CM		 3326 err = btrfs_update_inode(trans, root, inode);
3327 if (err)
3328 drop_inode = 1;
39279cc3
CM		 3329
3330out_unlock:
d3c2fdcf 3331 nr = trans->blocks_used;
39279cc3 3332 btrfs_end_transaction(trans, root);
1832a6d5 3333out_fail:
39279cc3 3334 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 3335 if (drop_inode) {
3336 inode_dec_link_count(inode);
3337 iput(inode);
3338 }
d3c2fdcf 3339 btrfs_btree_balance_dirty(root, nr);
e2008b61 3340 btrfs_throttle(root);
39279cc3
CM		 3341 return err;
3342}
16432985 3343
fdebe2bd
Y		 3344static int btrfs_permission(struct inode *inode, int mask,
3345 struct nameidata *nd)
3346{
3347 if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
3348 return -EACCES;
3349 return generic_permission(inode, mask, NULL);
3350}
39279cc3
CM		 3351
3352static struct inode_operations btrfs_dir_inode_operations = {
3353 .lookup = btrfs_lookup,
3354 .create = btrfs_create,
3355 .unlink = btrfs_unlink,
3356 .link = btrfs_link,
3357 .mkdir = btrfs_mkdir,
3358 .rmdir = btrfs_rmdir,
3359 .rename = btrfs_rename,
3360 .symlink = btrfs_symlink,
3361 .setattr = btrfs_setattr,
618e21d5 3362 .mknod = btrfs_mknod,
5103e947
JB		 3363 .setxattr = generic_setxattr,
3364 .getxattr = generic_getxattr,
3365 .listxattr = btrfs_listxattr,
3366 .removexattr = generic_removexattr,
fdebe2bd 3367 .permission = btrfs_permission,
39279cc3 3368};
39279cc3
CM		 3369static struct inode_operations btrfs_dir_ro_inode_operations = {
3370 .lookup = btrfs_lookup,
fdebe2bd 3371 .permission = btrfs_permission,
39279cc3 3372};
39279cc3
CM		 3373static struct file_operations btrfs_dir_file_operations = {
3374 .llseek = generic_file_llseek,
3375 .read = generic_read_dir,
3376 .readdir = btrfs_readdir,
34287aa3 3377 .unlocked_ioctl = btrfs_ioctl,
39279cc3 3378#ifdef CONFIG_COMPAT
34287aa3 3379 .compat_ioctl = btrfs_ioctl,
39279cc3
CM		 3380#endif
3381};
3382
d1310b2e 3383static struct extent_io_ops btrfs_extent_io_ops = {
07157aac 3384 .fill_delalloc = run_delalloc_range,
065631f6 3385 .submit_bio_hook = btrfs_submit_bio_hook,
239b14b3 3386 .merge_bio_hook = btrfs_merge_bio_hook,
07157aac
CM		 3387 .readpage_io_hook = btrfs_readpage_io_hook,
3388 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
7e38326f 3389 .readpage_io_failed_hook = btrfs_readpage_io_failed_hook,
b0c68f8b
CM		 3390 .set_bit_hook = btrfs_set_bit_hook,
3391 .clear_bit_hook = btrfs_clear_bit_hook,
07157aac
CM		 3392};
3393
39279cc3
CM		 3394static struct address_space_operations btrfs_aops = {
3395 .readpage = btrfs_readpage,
3396 .writepage = btrfs_writepage,
b293f02e 3397 .writepages = btrfs_writepages,
3ab2fb5a 3398 .readpages = btrfs_readpages,
39279cc3 3399 .sync_page = block_sync_page,
39279cc3 3400 .bmap = btrfs_bmap,
16432985 3401 .direct_IO = btrfs_direct_IO,
a52d9a80
CM		 3402 .invalidatepage = btrfs_invalidatepage,
3403 .releasepage = btrfs_releasepage,
3404 .set_page_dirty = __set_page_dirty_nobuffers,
39279cc3
CM		 3405};
3406
3407static struct address_space_operations btrfs_symlink_aops = {
3408 .readpage = btrfs_readpage,
3409 .writepage = btrfs_writepage,
2bf5a725
CM		 3410 .invalidatepage = btrfs_invalidatepage,
3411 .releasepage = btrfs_releasepage,
39279cc3
CM		 3412};
3413
3414static struct inode_operations btrfs_file_inode_operations = {
3415 .truncate = btrfs_truncate,
3416 .getattr = btrfs_getattr,
3417 .setattr = btrfs_setattr,
5103e947
JB		 3418 .setxattr = generic_setxattr,
3419 .getxattr = generic_getxattr,
3420 .listxattr = btrfs_listxattr,
3421 .removexattr = generic_removexattr,
fdebe2bd 3422 .permission = btrfs_permission,
39279cc3 3423};
618e21d5
JB		 3424static struct inode_operations btrfs_special_inode_operations = {
3425 .getattr = btrfs_getattr,
3426 .setattr = btrfs_setattr,
fdebe2bd 3427 .permission = btrfs_permission,
618e21d5 3428};
39279cc3
CM		 3429static struct inode_operations btrfs_symlink_inode_operations = {
3430 .readlink = generic_readlink,
3431 .follow_link = page_follow_link_light,
3432 .put_link = page_put_link,
fdebe2bd 3433 .permission = btrfs_permission,
39279cc3 3434};
Linux 6.x block layer and io_uring tree(s)