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Btrfs: Add new ioctl to add devices
[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
8f18cf13 19#include <linux/kernel.h>
065631f6 20#include <linux/bio.h>
39279cc3
CM		 21#include <linux/buffer_head.h>
22#include <linux/fs.h>
23#include <linux/pagemap.h>
24#include <linux/highmem.h>
25#include <linux/time.h>
26#include <linux/init.h>
27#include <linux/string.h>
28#include <linux/smp_lock.h>
29#include <linux/backing-dev.h>
30#include <linux/mpage.h>
31#include <linux/swap.h>
32#include <linux/writeback.h>
33#include <linux/statfs.h>
34#include <linux/compat.h>
9ebefb18 35#include <linux/bit_spinlock.h>
92fee66d 36#include <linux/version.h>
5103e947 37#include <linux/xattr.h>
39279cc3
CM		 38#include "ctree.h"
39#include "disk-io.h"
40#include "transaction.h"
41#include "btrfs_inode.h"
42#include "ioctl.h"
43#include "print-tree.h"
0b86a832 44#include "volumes.h"
39279cc3
CM		 45
46struct btrfs_iget_args {
47 u64 ino;
48 struct btrfs_root *root;
49};
50
51static struct inode_operations btrfs_dir_inode_operations;
52static struct inode_operations btrfs_symlink_inode_operations;
53static struct inode_operations btrfs_dir_ro_inode_operations;
618e21d5 54static struct inode_operations btrfs_special_inode_operations;
39279cc3
CM		 55static struct inode_operations btrfs_file_inode_operations;
56static struct address_space_operations btrfs_aops;
57static struct address_space_operations btrfs_symlink_aops;
58static struct file_operations btrfs_dir_file_operations;
d1310b2e 59static struct extent_io_ops btrfs_extent_io_ops;
39279cc3
CM		 60
61static struct kmem_cache *btrfs_inode_cachep;
62struct kmem_cache *btrfs_trans_handle_cachep;
63struct kmem_cache *btrfs_transaction_cachep;
64struct kmem_cache *btrfs_bit_radix_cachep;
65struct kmem_cache *btrfs_path_cachep;
66
67#define S_SHIFT 12
68static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
69 [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
70 [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
71 [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
72 [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
73 [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
74 [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
75 [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
76};
77
1832a6d5
CM		 78int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
79 int for_del)
80{
81 u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy);
82 u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy);
83 u64 thresh;
bcbfce8a 84 unsigned long flags;
1832a6d5
CM		 85 int ret = 0;
86
87 if (for_del)
f9ef6604 88 thresh = total * 90;
1832a6d5 89 else
f9ef6604
CM		 90 thresh = total * 85;
91
92 do_div(thresh, 100);
1832a6d5 93
bcbfce8a 94 spin_lock_irqsave(&root->fs_info->delalloc_lock, flags);
1832a6d5
CM		 95 if (used + root->fs_info->delalloc_bytes + num_required > thresh)
96 ret = -ENOSPC;
bcbfce8a 97 spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags);
1832a6d5
CM		 98 return ret;
99}
100
be20aa9d 101static int cow_file_range(struct inode *inode, u64 start, u64 end)
b888db2b
CM		 102{
103 struct btrfs_root *root = BTRFS_I(inode)->root;
104 struct btrfs_trans_handle *trans;
b888db2b 105 u64 alloc_hint = 0;
db94535d 106 u64 num_bytes;
c59f8951 107 u64 cur_alloc_size;
db94535d 108 u64 blocksize = root->sectorsize;
d1310b2e
CM		 109 u64 orig_start = start;
110 u64 orig_num_bytes;
be20aa9d
CM		 111 struct btrfs_key ins;
112 int ret;
b888db2b 113
b888db2b 114 trans = btrfs_start_transaction(root, 1);
b888db2b 115 BUG_ON(!trans);
be20aa9d
CM		 116 btrfs_set_trans_block_group(trans, inode);
117
db94535d 118 num_bytes = (end - start + blocksize) & ~(blocksize - 1);
be20aa9d 119 num_bytes = max(blocksize, num_bytes);
b888db2b 120 ret = btrfs_drop_extents(trans, root, inode,
3326d1b0 121 start, start + num_bytes, start, &alloc_hint);
d1310b2e 122 orig_num_bytes = num_bytes;
db94535d 123
179e29e4
CM		 124 if (alloc_hint == EXTENT_MAP_INLINE)
125 goto out;
126
3b951516
CM		 127 BUG_ON(num_bytes > btrfs_super_total_bytes(&root->fs_info->super_copy));
128
c59f8951
CM		 129 while(num_bytes > 0) {
130 cur_alloc_size = min(num_bytes, root->fs_info->max_extent);
131 ret = btrfs_alloc_extent(trans, root, cur_alloc_size,
98d20f67 132 root->sectorsize,
c59f8951
CM		 133 root->root_key.objectid,
134 trans->transid,
135 inode->i_ino, start, 0,
136 alloc_hint, (u64)-1, &ins, 1);
137 if (ret) {
138 WARN_ON(1);
139 goto out;
140 }
98d20f67 141 cur_alloc_size = ins.offset;
c59f8951
CM		 142 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
143 start, ins.objectid, ins.offset,
144 ins.offset);
9069218d 145 inode->i_blocks += ins.offset >> 9;
5f56406a 146 btrfs_check_file(root, inode);
3b951516
CM		 147 if (num_bytes < cur_alloc_size) {
148 printk("num_bytes %Lu cur_alloc %Lu\n", num_bytes,
149 cur_alloc_size);
150 break;
151 }
c59f8951
CM		 152 num_bytes -= cur_alloc_size;
153 alloc_hint = ins.objectid + ins.offset;
154 start += cur_alloc_size;
b888db2b 155 }
d1310b2e
CM		 156 btrfs_drop_extent_cache(inode, orig_start,
157 orig_start + orig_num_bytes - 1);
dc17ff8f 158 btrfs_add_ordered_inode(inode);
9069218d 159 btrfs_update_inode(trans, root, inode);
b888db2b
CM		 160out:
161 btrfs_end_transaction(trans, root);
be20aa9d
CM		 162 return ret;
163}
164
165static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end)
166{
167 u64 extent_start;
168 u64 extent_end;
169 u64 bytenr;
170 u64 cow_end;
1832a6d5 171 u64 loops = 0;
c31f8830 172 u64 total_fs_bytes;
be20aa9d
CM		 173 struct btrfs_root *root = BTRFS_I(inode)->root;
174 struct extent_buffer *leaf;
175 int found_type;
176 struct btrfs_path *path;
177 struct btrfs_file_extent_item *item;
178 int ret;
179 int err;
180 struct btrfs_key found_key;
181
c31f8830 182 total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
be20aa9d
CM		 183 path = btrfs_alloc_path();
184 BUG_ON(!path);
185again:
186 ret = btrfs_lookup_file_extent(NULL, root, path,
187 inode->i_ino, start, 0);
188 if (ret < 0) {
189 btrfs_free_path(path);
190 return ret;
191 }
192
193 cow_end = end;
194 if (ret != 0) {
195 if (path->slots[0] == 0)
196 goto not_found;
197 path->slots[0]--;
198 }
199
200 leaf = path->nodes[0];
201 item = btrfs_item_ptr(leaf, path->slots[0],
202 struct btrfs_file_extent_item);
203
204 /* are we inside the extent that was found? */
205 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
206 found_type = btrfs_key_type(&found_key);
207 if (found_key.objectid != inode->i_ino ||
208 found_type != BTRFS_EXTENT_DATA_KEY) {
209 goto not_found;
210 }
211
212 found_type = btrfs_file_extent_type(leaf, item);
213 extent_start = found_key.offset;
214 if (found_type == BTRFS_FILE_EXTENT_REG) {
c31f8830
CM		 215 u64 extent_num_bytes;
216
217 extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item);
218 extent_end = extent_start + extent_num_bytes;
be20aa9d
CM		 219 err = 0;
220
1832a6d5
CM		 221 if (loops && start != extent_start)
222 goto not_found;
223
be20aa9d
CM		 224 if (start < extent_start || start >= extent_end)
225 goto not_found;
226
227 cow_end = min(end, extent_end - 1);
228 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
229 if (bytenr == 0)
230 goto not_found;
231
c31f8830
CM		 232 /*
233 * we may be called by the resizer, make sure we're inside
234 * the limits of the FS
235 */
236 if (bytenr + extent_num_bytes > total_fs_bytes)
237 goto not_found;
238
be20aa9d
CM		 239 if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) {
240 goto not_found;
241 }
242
243 start = extent_end;
bd09835d 244 } else {
be20aa9d
CM		 245 goto not_found;
246 }
247loop:
248 if (start > end) {
249 btrfs_free_path(path);
250 return 0;
251 }
252 btrfs_release_path(root, path);
1832a6d5 253 loops++;
be20aa9d
CM		 254 goto again;
255
256not_found:
257 cow_file_range(inode, start, cow_end);
258 start = cow_end + 1;
259 goto loop;
260}
261
262static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
263{
264 struct btrfs_root *root = BTRFS_I(inode)->root;
265 int ret;
be20aa9d 266 mutex_lock(&root->fs_info->fs_mutex);
b98b6767
Y		 267 if (btrfs_test_opt(root, NODATACOW) ||
268 btrfs_test_flag(inode, NODATACOW))
be20aa9d
CM		 269 ret = run_delalloc_nocow(inode, start, end);
270 else
271 ret = cow_file_range(inode, start, end);
1832a6d5 272
b888db2b
CM		 273 mutex_unlock(&root->fs_info->fs_mutex);
274 return ret;
275}
276
291d673e 277int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
b0c68f8b 278 unsigned long old, unsigned long bits)
291d673e 279{
bcbfce8a 280 unsigned long flags;
b0c68f8b 281 if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
291d673e 282 struct btrfs_root *root = BTRFS_I(inode)->root;
bcbfce8a 283 spin_lock_irqsave(&root->fs_info->delalloc_lock, flags);
9069218d 284 BTRFS_I(inode)->delalloc_bytes += end - start + 1;
291d673e 285 root->fs_info->delalloc_bytes += end - start + 1;
bcbfce8a 286 spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags);
291d673e
CM		 287 }
288 return 0;
289}
290
291int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
b0c68f8b 292 unsigned long old, unsigned long bits)
291d673e 293{
b0c68f8b 294 if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
291d673e 295 struct btrfs_root *root = BTRFS_I(inode)->root;
bcbfce8a
CM		 296 unsigned long flags;
297
298 spin_lock_irqsave(&root->fs_info->delalloc_lock, flags);
b0c68f8b
CM		 299 if (end - start + 1 > root->fs_info->delalloc_bytes) {
300 printk("warning: delalloc account %Lu %Lu\n",
301 end - start + 1, root->fs_info->delalloc_bytes);
302 root->fs_info->delalloc_bytes = 0;
9069218d 303 BTRFS_I(inode)->delalloc_bytes = 0;
b0c68f8b
CM		 304 } else {
305 root->fs_info->delalloc_bytes -= end - start + 1;
9069218d 306 BTRFS_I(inode)->delalloc_bytes -= end - start + 1;
b0c68f8b 307 }
bcbfce8a 308 spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags);
291d673e
CM		 309 }
310 return 0;
311}
312
239b14b3
CM		 313int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
314 size_t size, struct bio *bio)
315{
316 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
317 struct btrfs_mapping_tree *map_tree;
239b14b3 318 u64 logical = bio->bi_sector << 9;
239b14b3
CM		 319 u64 length = 0;
320 u64 map_length;
239b14b3
CM		 321 int ret;
322
f2d8d74d 323 length = bio->bi_size;
239b14b3
CM		 324 map_tree = &root->fs_info->mapping_tree;
325 map_length = length;
cea9e445 326 ret = btrfs_map_block(map_tree, READ, logical,
f188591e 327 &map_length, NULL, 0);
cea9e445 328
239b14b3 329 if (map_length < length + size) {
239b14b3
CM		 330 return 1;
331 }
332 return 0;
333}
334
44b8bd7e 335int __btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
f188591e 336 int mirror_num)
065631f6 337{
065631f6
CM		 338 struct btrfs_root *root = BTRFS_I(inode)->root;
339 struct btrfs_trans_handle *trans;
340 int ret = 0;
e015640f
CM		 341 char *sums = NULL;
342
343 ret = btrfs_csum_one_bio(root, bio, &sums);
344 BUG_ON(ret);
065631f6 345
44b8bd7e
CM		 346 mutex_lock(&root->fs_info->fs_mutex);
347 trans = btrfs_start_transaction(root, 1);
e015640f 348
44b8bd7e 349 btrfs_set_trans_block_group(trans, inode);
e015640f
CM		 350 btrfs_csum_file_blocks(trans, root, inode, bio, sums);
351
44b8bd7e
CM		 352 ret = btrfs_end_transaction(trans, root);
353 BUG_ON(ret);
354 mutex_unlock(&root->fs_info->fs_mutex);
e015640f
CM		 355
356 kfree(sums);
357
44b8bd7e
CM		 358 return btrfs_map_bio(root, rw, bio, mirror_num);
359}
360
361int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
362 int mirror_num)
363{
364 struct btrfs_root *root = BTRFS_I(inode)->root;
365 int ret = 0;
366
22c59948
CM		 367 if (!(rw & (1 << BIO_RW))) {
368 ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
369 BUG_ON(ret);
0b86a832
CM		 370 goto mapit;
371 }
065631f6
CM		 372
373 if (btrfs_test_opt(root, NODATASUM) ||
0b86a832
CM		 374 btrfs_test_flag(inode, NODATASUM)) {
375 goto mapit;
376 }
065631f6 377
44b8bd7e
CM		 378 return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
379 inode, rw, bio, mirror_num,
380 __btrfs_submit_bio_hook);
0b86a832 381mapit:
f188591e 382 return btrfs_map_bio(root, rw, bio, mirror_num);
065631f6 383}
6885f308 384
07157aac
CM		 385int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
386{
387 int ret = 0;
388 struct inode *inode = page->mapping->host;
389 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 390 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
07157aac
CM		 391 struct btrfs_csum_item *item;
392 struct btrfs_path *path = NULL;
ff79f819 393 u32 csum;
699122f5 394
b98b6767
Y		 395 if (btrfs_test_opt(root, NODATASUM) ||
396 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 397 return 0;
699122f5 398
07157aac
CM		 399 mutex_lock(&root->fs_info->fs_mutex);
400 path = btrfs_alloc_path();
401 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
402 if (IS_ERR(item)) {
403 ret = PTR_ERR(item);
404 /* a csum that isn't present is a preallocated region. */
405 if (ret == -ENOENT || ret == -EFBIG)
406 ret = 0;
ff79f819 407 csum = 0;
aadfeb6e 408 printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start);
07157aac
CM		 409 goto out;
410 }
ff79f819
CM		 411 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
412 BTRFS_CRC32_SIZE);
d1310b2e 413 set_state_private(io_tree, start, csum);
07157aac
CM		 414out:
415 if (path)
416 btrfs_free_path(path);
417 mutex_unlock(&root->fs_info->fs_mutex);
418 return ret;
419}
420
7e38326f
CM		 421struct io_failure_record {
422 struct page *page;
423 u64 start;
424 u64 len;
425 u64 logical;
426 int last_mirror;
427};
428
429int btrfs_readpage_io_failed_hook(struct bio *failed_bio,
430 struct page *page, u64 start, u64 end,
431 struct extent_state *state)
432{
433 struct io_failure_record *failrec = NULL;
434 u64 private;
435 struct extent_map *em;
436 struct inode *inode = page->mapping->host;
437 struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree;
3b951516 438 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
7e38326f
CM		 439 struct bio *bio;
440 int num_copies;
441 int ret;
442 u64 logical;
443
444 ret = get_state_private(failure_tree, start, &private);
445 if (ret) {
7e38326f
CM		 446 failrec = kmalloc(sizeof(*failrec), GFP_NOFS);
447 if (!failrec)
448 return -ENOMEM;
449 failrec->start = start;
450 failrec->len = end - start + 1;
451 failrec->last_mirror = 0;
452
3b951516
CM		 453 spin_lock(&em_tree->lock);
454 em = lookup_extent_mapping(em_tree, start, failrec->len);
455 if (em->start > start || em->start + em->len < start) {
456 free_extent_map(em);
457 em = NULL;
458 }
459 spin_unlock(&em_tree->lock);
7e38326f
CM		 460
461 if (!em || IS_ERR(em)) {
462 kfree(failrec);
463 return -EIO;
464 }
465 logical = start - em->start;
466 logical = em->block_start + logical;
467 failrec->logical = logical;
468 free_extent_map(em);
469 set_extent_bits(failure_tree, start, end, EXTENT_LOCKED |
470 EXTENT_DIRTY, GFP_NOFS);
587f7704
CM		 471 set_state_private(failure_tree, start,
472 (u64)(unsigned long)failrec);
7e38326f 473 } else {
587f7704 474 failrec = (struct io_failure_record *)(unsigned long)private;
7e38326f
CM		 475 }
476 num_copies = btrfs_num_copies(
477 &BTRFS_I(inode)->root->fs_info->mapping_tree,
478 failrec->logical, failrec->len);
479 failrec->last_mirror++;
480 if (!state) {
481 spin_lock_irq(&BTRFS_I(inode)->io_tree.lock);
482 state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree,
483 failrec->start,
484 EXTENT_LOCKED);
485 if (state && state->start != failrec->start)
486 state = NULL;
487 spin_unlock_irq(&BTRFS_I(inode)->io_tree.lock);
488 }
489 if (!state || failrec->last_mirror > num_copies) {
490 set_state_private(failure_tree, failrec->start, 0);
491 clear_extent_bits(failure_tree, failrec->start,
492 failrec->start + failrec->len - 1,
493 EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS);
494 kfree(failrec);
495 return -EIO;
496 }
497 bio = bio_alloc(GFP_NOFS, 1);
498 bio->bi_private = state;
499 bio->bi_end_io = failed_bio->bi_end_io;
500 bio->bi_sector = failrec->logical >> 9;
501 bio->bi_bdev = failed_bio->bi_bdev;
e1c4b745 502 bio->bi_size = 0;
7e38326f
CM		 503 bio_add_page(bio, page, failrec->len, start - page_offset(page));
504 btrfs_submit_bio_hook(inode, READ, bio, failrec->last_mirror);
505 return 0;
506}
507
70dec807
CM		 508int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
509 struct extent_state *state)
07157aac 510{
35ebb934 511 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
07157aac 512 struct inode *inode = page->mapping->host;
d1310b2e 513 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
07157aac 514 char *kaddr;
aadfeb6e 515 u64 private = ~(u32)0;
07157aac 516 int ret;
ff79f819
CM		 517 struct btrfs_root *root = BTRFS_I(inode)->root;
518 u32 csum = ~(u32)0;
bbf0d006 519 unsigned long flags;
d1310b2e 520
b98b6767
Y		 521 if (btrfs_test_opt(root, NODATASUM) ||
522 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 523 return 0;
c2e639f0 524 if (state && state->start == start) {
70dec807
CM		 525 private = state->private;
526 ret = 0;
527 } else {
528 ret = get_state_private(io_tree, start, &private);
529 }
bbf0d006 530 local_irq_save(flags);
07157aac
CM		 531 kaddr = kmap_atomic(page, KM_IRQ0);
532 if (ret) {
533 goto zeroit;
534 }
ff79f819
CM		 535 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
536 btrfs_csum_final(csum, (char *)&csum);
537 if (csum != private) {
07157aac
CM		 538 goto zeroit;
539 }
540 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 541 local_irq_restore(flags);
7e38326f
CM		 542
543 /* if the io failure tree for this inode is non-empty,
544 * check to see if we've recovered from a failed IO
545 */
546 private = 0;
547 if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private,
548 (u64)-1, 1, EXTENT_DIRTY)) {
549 u64 private_failure;
550 struct io_failure_record *failure;
551 ret = get_state_private(&BTRFS_I(inode)->io_failure_tree,
552 start, &private_failure);
553 if (ret == 0) {
587f7704
CM		 554 failure = (struct io_failure_record *)(unsigned long)
555 private_failure;
7e38326f
CM		 556 set_state_private(&BTRFS_I(inode)->io_failure_tree,
557 failure->start, 0);
558 clear_extent_bits(&BTRFS_I(inode)->io_failure_tree,
559 failure->start,
560 failure->start + failure->len - 1,
561 EXTENT_DIRTY | EXTENT_LOCKED,
562 GFP_NOFS);
563 kfree(failure);
564 }
565 }
07157aac
CM		 566 return 0;
567
568zeroit:
aadfeb6e
CM		 569 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
570 page->mapping->host->i_ino, (unsigned long long)start, csum,
571 private);
db94535d
CM		 572 memset(kaddr + offset, 1, end - start + 1);
573 flush_dcache_page(page);
07157aac 574 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 575 local_irq_restore(flags);
3b951516
CM		 576 if (private == 0)
577 return 0;
7e38326f 578 return -EIO;
07157aac 579}
b888db2b 580
39279cc3
CM		 581void btrfs_read_locked_inode(struct inode *inode)
582{
583 struct btrfs_path *path;
5f39d397 584 struct extent_buffer *leaf;
39279cc3 585 struct btrfs_inode_item *inode_item;
0b86a832 586 struct btrfs_timespec *tspec;
39279cc3
CM		 587 struct btrfs_root *root = BTRFS_I(inode)->root;
588 struct btrfs_key location;
589 u64 alloc_group_block;
618e21d5 590 u32 rdev;
39279cc3
CM		 591 int ret;
592
593 path = btrfs_alloc_path();
594 BUG_ON(!path);
39279cc3 595 mutex_lock(&root->fs_info->fs_mutex);
39279cc3 596 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
dc17ff8f 597
39279cc3 598 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
5f39d397 599 if (ret)
39279cc3 600 goto make_bad;
39279cc3 601
5f39d397
CM		 602 leaf = path->nodes[0];
603 inode_item = btrfs_item_ptr(leaf, path->slots[0],
604 struct btrfs_inode_item);
605
606 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
607 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
608 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
609 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
610 inode->i_size = btrfs_inode_size(leaf, inode_item);
611
612 tspec = btrfs_inode_atime(inode_item);
613 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
614 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
615
616 tspec = btrfs_inode_mtime(inode_item);
617 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
618 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
619
620 tspec = btrfs_inode_ctime(inode_item);
621 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
622 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
623
624 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
625 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
618e21d5 626 inode->i_rdev = 0;
5f39d397
CM		 627 rdev = btrfs_inode_rdev(leaf, inode_item);
628
629 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
39279cc3
CM		 630 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
631 alloc_group_block);
b98b6767 632 BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
e52ec0eb
CM		 633 if (!BTRFS_I(inode)->block_group) {
634 BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
0b86a832
CM		 635 NULL, 0,
636 BTRFS_BLOCK_GROUP_METADATA, 0);
e52ec0eb 637 }
39279cc3
CM		 638 btrfs_free_path(path);
639 inode_item = NULL;
640
641 mutex_unlock(&root->fs_info->fs_mutex);
642
643 switch (inode->i_mode & S_IFMT) {
39279cc3
CM		 644 case S_IFREG:
645 inode->i_mapping->a_ops = &btrfs_aops;
04160088 646 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
d1310b2e 647 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 648 inode->i_fop = &btrfs_file_operations;
649 inode->i_op = &btrfs_file_inode_operations;
650 break;
651 case S_IFDIR:
652 inode->i_fop = &btrfs_dir_file_operations;
653 if (root == root->fs_info->tree_root)
654 inode->i_op = &btrfs_dir_ro_inode_operations;
655 else
656 inode->i_op = &btrfs_dir_inode_operations;
657 break;
658 case S_IFLNK:
659 inode->i_op = &btrfs_symlink_inode_operations;
660 inode->i_mapping->a_ops = &btrfs_symlink_aops;
04160088 661 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3 662 break;
618e21d5
JB		 663 default:
664 init_special_inode(inode, inode->i_mode, rdev);
665 break;
39279cc3
CM		 666 }
667 return;
668
669make_bad:
670 btrfs_release_path(root, path);
671 btrfs_free_path(path);
672 mutex_unlock(&root->fs_info->fs_mutex);
673 make_bad_inode(inode);
674}
675
5f39d397
CM		 676static void fill_inode_item(struct extent_buffer *leaf,
677 struct btrfs_inode_item *item,
39279cc3
CM		 678 struct inode *inode)
679{
5f39d397
CM		 680 btrfs_set_inode_uid(leaf, item, inode->i_uid);
681 btrfs_set_inode_gid(leaf, item, inode->i_gid);
682 btrfs_set_inode_size(leaf, item, inode->i_size);
683 btrfs_set_inode_mode(leaf, item, inode->i_mode);
684 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
685
686 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
687 inode->i_atime.tv_sec);
688 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
689 inode->i_atime.tv_nsec);
690
691 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
692 inode->i_mtime.tv_sec);
693 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
694 inode->i_mtime.tv_nsec);
695
696 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
697 inode->i_ctime.tv_sec);
698 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
699 inode->i_ctime.tv_nsec);
700
701 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
702 btrfs_set_inode_generation(leaf, item, inode->i_generation);
703 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
b98b6767 704 btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
5f39d397 705 btrfs_set_inode_block_group(leaf, item,
39279cc3
CM		 706 BTRFS_I(inode)->block_group->key.objectid);
707}
708
a52d9a80 709int btrfs_update_inode(struct btrfs_trans_handle *trans,
39279cc3
CM		 710 struct btrfs_root *root,
711 struct inode *inode)
712{
713 struct btrfs_inode_item *inode_item;
714 struct btrfs_path *path;
5f39d397 715 struct extent_buffer *leaf;
39279cc3
CM		 716 int ret;
717
718 path = btrfs_alloc_path();
719 BUG_ON(!path);
39279cc3
CM		 720 ret = btrfs_lookup_inode(trans, root, path,
721 &BTRFS_I(inode)->location, 1);
722 if (ret) {
723 if (ret > 0)
724 ret = -ENOENT;
725 goto failed;
726 }
727
5f39d397
CM		 728 leaf = path->nodes[0];
729 inode_item = btrfs_item_ptr(leaf, path->slots[0],
39279cc3
CM		 730 struct btrfs_inode_item);
731
5f39d397
CM		 732 fill_inode_item(leaf, inode_item, inode);
733 btrfs_mark_buffer_dirty(leaf);
15ee9bc7 734 btrfs_set_inode_last_trans(trans, inode);
39279cc3
CM		 735 ret = 0;
736failed:
737 btrfs_release_path(root, path);
738 btrfs_free_path(path);
739 return ret;
740}
741
742
743static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
744 struct btrfs_root *root,
745 struct inode *dir,
746 struct dentry *dentry)
747{
748 struct btrfs_path *path;
749 const char *name = dentry->d_name.name;
750 int name_len = dentry->d_name.len;
751 int ret = 0;
5f39d397 752 struct extent_buffer *leaf;
39279cc3 753 struct btrfs_dir_item *di;
5f39d397 754 struct btrfs_key key;
39279cc3
CM		 755
756 path = btrfs_alloc_path();
54aa1f4d
CM		 757 if (!path) {
758 ret = -ENOMEM;
759 goto err;
760 }
761
39279cc3
CM		 762 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
763 name, name_len, -1);
764 if (IS_ERR(di)) {
765 ret = PTR_ERR(di);
766 goto err;
767 }
768 if (!di) {
769 ret = -ENOENT;
770 goto err;
771 }
5f39d397
CM		 772 leaf = path->nodes[0];
773 btrfs_dir_item_key_to_cpu(leaf, di, &key);
39279cc3 774 ret = btrfs_delete_one_dir_name(trans, root, path, di);
54aa1f4d
CM		 775 if (ret)
776 goto err;
39279cc3
CM		 777 btrfs_release_path(root, path);
778
779 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
5f39d397 780 key.objectid, name, name_len, -1);
39279cc3
CM		 781 if (IS_ERR(di)) {
782 ret = PTR_ERR(di);
783 goto err;
784 }
785 if (!di) {
786 ret = -ENOENT;
787 goto err;
788 }
789 ret = btrfs_delete_one_dir_name(trans, root, path, di);
39279cc3
CM		 790
791 dentry->d_inode->i_ctime = dir->i_ctime;
76fea00a
CM		 792 ret = btrfs_del_inode_ref(trans, root, name, name_len,
793 dentry->d_inode->i_ino,
794 dentry->d_parent->d_inode->i_ino);
795 if (ret) {
796 printk("failed to delete reference to %.*s, "
797 "inode %lu parent %lu\n", name_len, name,
798 dentry->d_inode->i_ino,
799 dentry->d_parent->d_inode->i_ino);
3954401f 800 }
39279cc3
CM		 801err:
802 btrfs_free_path(path);
803 if (!ret) {
804 dir->i_size -= name_len * 2;
79c44584 805 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
39279cc3 806 btrfs_update_inode(trans, root, dir);
6da6abae
CM		 807#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
808 dentry->d_inode->i_nlink--;
809#else
39279cc3 810 drop_nlink(dentry->d_inode);
6da6abae 811#endif
54aa1f4d 812 ret = btrfs_update_inode(trans, root, dentry->d_inode);
39279cc3
CM		 813 dir->i_sb->s_dirt = 1;
814 }
815 return ret;
816}
817
818static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
819{
820 struct btrfs_root *root;
821 struct btrfs_trans_handle *trans;
2da98f00 822 struct inode *inode = dentry->d_inode;
39279cc3 823 int ret;
1832a6d5 824 unsigned long nr = 0;
39279cc3
CM		 825
826 root = BTRFS_I(dir)->root;
827 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 828
829 ret = btrfs_check_free_space(root, 1, 1);
830 if (ret)
831 goto fail;
832
39279cc3 833 trans = btrfs_start_transaction(root, 1);
5f39d397 834
39279cc3
CM		 835 btrfs_set_trans_block_group(trans, dir);
836 ret = btrfs_unlink_trans(trans, root, dir, dentry);
d3c2fdcf 837 nr = trans->blocks_used;
5f39d397 838
2da98f00
CM		 839 if (inode->i_nlink == 0) {
840 int found;
841 /* if the inode isn't linked anywhere,
842 * we don't need to worry about
843 * data=ordered
844 */
845 found = btrfs_del_ordered_inode(inode);
846 if (found == 1) {
847 atomic_dec(&inode->i_count);
848 }
849 }
850
39279cc3 851 btrfs_end_transaction(trans, root);
1832a6d5 852fail:
39279cc3 853 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 854 btrfs_btree_balance_dirty(root, nr);
e2008b61 855 btrfs_throttle(root);
39279cc3
CM		 856 return ret;
857}
858
859static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
860{
861 struct inode *inode = dentry->d_inode;
1832a6d5 862 int err = 0;
39279cc3
CM		 863 int ret;
864 struct btrfs_root *root = BTRFS_I(dir)->root;
39279cc3 865 struct btrfs_trans_handle *trans;
1832a6d5 866 unsigned long nr = 0;
39279cc3 867
134d4512
Y		 868 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
869 return -ENOTEMPTY;
870
39279cc3 871 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 872 ret = btrfs_check_free_space(root, 1, 1);
873 if (ret)
874 goto fail;
875
39279cc3
CM		 876 trans = btrfs_start_transaction(root, 1);
877 btrfs_set_trans_block_group(trans, dir);
39279cc3
CM		 878
879 /* now the directory is empty */
880 err = btrfs_unlink_trans(trans, root, dir, dentry);
881 if (!err) {
882 inode->i_size = 0;
883 }
3954401f 884
d3c2fdcf 885 nr = trans->blocks_used;
39279cc3 886 ret = btrfs_end_transaction(trans, root);
1832a6d5 887fail:
134d4512 888 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 889 btrfs_btree_balance_dirty(root, nr);
e2008b61 890 btrfs_throttle(root);
3954401f 891
39279cc3
CM		 892 if (ret && !err)
893 err = ret;
894 return err;
895}
896
39279cc3
CM		 897/*
898 * this can truncate away extent items, csum items and directory items.
899 * It starts at a high offset and removes keys until it can't find
900 * any higher than i_size.
901 *
902 * csum items that cross the new i_size are truncated to the new size
903 * as well.
904 */
905static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
906 struct btrfs_root *root,
85e21bac
CM		 907 struct inode *inode,
908 u32 min_type)
39279cc3
CM		 909{
910 int ret;
911 struct btrfs_path *path;
912 struct btrfs_key key;
5f39d397 913 struct btrfs_key found_key;
39279cc3 914 u32 found_type;
5f39d397 915 struct extent_buffer *leaf;
39279cc3
CM		 916 struct btrfs_file_extent_item *fi;
917 u64 extent_start = 0;
db94535d 918 u64 extent_num_bytes = 0;
39279cc3 919 u64 item_end = 0;
7bb86316 920 u64 root_gen = 0;
d8d5f3e1 921 u64 root_owner = 0;
39279cc3
CM		 922 int found_extent;
923 int del_item;
85e21bac
CM		 924 int pending_del_nr = 0;
925 int pending_del_slot = 0;
179e29e4 926 int extent_type = -1;
3b951516 927 u64 mask = root->sectorsize - 1;
39279cc3 928
3b951516 929 btrfs_drop_extent_cache(inode, inode->i_size & (~mask), (u64)-1);
39279cc3 930 path = btrfs_alloc_path();
3c69faec 931 path->reada = -1;
39279cc3 932 BUG_ON(!path);
5f39d397 933
39279cc3
CM		 934 /* FIXME, add redo link to tree so we don't leak on crash */
935 key.objectid = inode->i_ino;
936 key.offset = (u64)-1;
5f39d397
CM		 937 key.type = (u8)-1;
938
85e21bac
CM		 939 btrfs_init_path(path);
940search_again:
941 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
942 if (ret < 0) {
943 goto error;
944 }
945 if (ret > 0) {
946 BUG_ON(path->slots[0] == 0);
947 path->slots[0]--;
948 }
949
39279cc3 950 while(1) {
39279cc3 951 fi = NULL;
5f39d397
CM		 952 leaf = path->nodes[0];
953 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
954 found_type = btrfs_key_type(&found_key);
39279cc3 955
5f39d397 956 if (found_key.objectid != inode->i_ino)
39279cc3 957 break;
5f39d397 958
85e21bac 959 if (found_type < min_type)
39279cc3
CM		 960 break;
961
5f39d397 962 item_end = found_key.offset;
39279cc3 963 if (found_type == BTRFS_EXTENT_DATA_KEY) {
5f39d397 964 fi = btrfs_item_ptr(leaf, path->slots[0],
39279cc3 965 struct btrfs_file_extent_item);
179e29e4
CM		 966 extent_type = btrfs_file_extent_type(leaf, fi);
967 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
5f39d397 968 item_end +=
db94535d 969 btrfs_file_extent_num_bytes(leaf, fi);
179e29e4
CM		 970 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
971 struct btrfs_item *item = btrfs_item_nr(leaf,
972 path->slots[0]);
973 item_end += btrfs_file_extent_inline_len(leaf,
974 item);
39279cc3 975 }
008630c1 976 item_end--;
39279cc3
CM		 977 }
978 if (found_type == BTRFS_CSUM_ITEM_KEY) {
979 ret = btrfs_csum_truncate(trans, root, path,
980 inode->i_size);
981 BUG_ON(ret);
982 }
008630c1 983 if (item_end < inode->i_size) {
b888db2b
CM		 984 if (found_type == BTRFS_DIR_ITEM_KEY) {
985 found_type = BTRFS_INODE_ITEM_KEY;
986 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
987 found_type = BTRFS_CSUM_ITEM_KEY;
85e21bac
CM		 988 } else if (found_type == BTRFS_EXTENT_DATA_KEY) {
989 found_type = BTRFS_XATTR_ITEM_KEY;
990 } else if (found_type == BTRFS_XATTR_ITEM_KEY) {
991 found_type = BTRFS_INODE_REF_KEY;
b888db2b
CM		 992 } else if (found_type) {
993 found_type--;
994 } else {
995 break;
39279cc3 996 }
a61721d5 997 btrfs_set_key_type(&key, found_type);
85e21bac 998 goto next;
39279cc3 999 }
5f39d397 1000 if (found_key.offset >= inode->i_size)
39279cc3
CM		 1001 del_item = 1;
1002 else
1003 del_item = 0;
1004 found_extent = 0;
1005
1006 /* FIXME, shrink the extent if the ref count is only 1 */
179e29e4
CM		 1007 if (found_type != BTRFS_EXTENT_DATA_KEY)
1008 goto delete;
1009
1010 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
39279cc3 1011 u64 num_dec;
db94535d 1012 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
39279cc3 1013 if (!del_item) {
db94535d
CM		 1014 u64 orig_num_bytes =
1015 btrfs_file_extent_num_bytes(leaf, fi);
1016 extent_num_bytes = inode->i_size -
5f39d397 1017 found_key.offset + root->sectorsize - 1;
b1632b10
Y		 1018 extent_num_bytes = extent_num_bytes &
1019 ~((u64)root->sectorsize - 1);
db94535d
CM		 1020 btrfs_set_file_extent_num_bytes(leaf, fi,
1021 extent_num_bytes);
1022 num_dec = (orig_num_bytes -
9069218d
CM		 1023 extent_num_bytes);
1024 if (extent_start != 0)
1025 dec_i_blocks(inode, num_dec);
5f39d397 1026 btrfs_mark_buffer_dirty(leaf);
39279cc3 1027 } else {
db94535d
CM		 1028 extent_num_bytes =
1029 btrfs_file_extent_disk_num_bytes(leaf,
1030 fi);
39279cc3 1031 /* FIXME blocksize != 4096 */
9069218d 1032 num_dec = btrfs_file_extent_num_bytes(leaf, fi);
39279cc3
CM		 1033 if (extent_start != 0) {
1034 found_extent = 1;
9069218d 1035 dec_i_blocks(inode, num_dec);
39279cc3 1036 }
d8d5f3e1
CM		 1037 root_gen = btrfs_header_generation(leaf);
1038 root_owner = btrfs_header_owner(leaf);
39279cc3 1039 }
9069218d
CM		 1040 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
1041 if (!del_item) {
1042 u32 newsize = inode->i_size - found_key.offset;
1043 dec_i_blocks(inode, item_end + 1 -
1044 found_key.offset - newsize);
1045 newsize =
1046 btrfs_file_extent_calc_inline_size(newsize);
1047 ret = btrfs_truncate_item(trans, root, path,
1048 newsize, 1);
1049 BUG_ON(ret);
1050 } else {
1051 dec_i_blocks(inode, item_end + 1 -
1052 found_key.offset);
1053 }
39279cc3 1054 }
179e29e4 1055delete:
39279cc3 1056 if (del_item) {
85e21bac
CM		 1057 if (!pending_del_nr) {
1058 /* no pending yet, add ourselves */
1059 pending_del_slot = path->slots[0];
1060 pending_del_nr = 1;
1061 } else if (pending_del_nr &&
1062 path->slots[0] + 1 == pending_del_slot) {
1063 /* hop on the pending chunk */
1064 pending_del_nr++;
1065 pending_del_slot = path->slots[0];
1066 } else {
1067 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot);
1068 }
39279cc3
CM		 1069 } else {
1070 break;
1071 }
39279cc3
CM		 1072 if (found_extent) {
1073 ret = btrfs_free_extent(trans, root, extent_start,
7bb86316 1074 extent_num_bytes,
d8d5f3e1 1075 root_owner,
7bb86316
CM		 1076 root_gen, inode->i_ino,
1077 found_key.offset, 0);
39279cc3
CM		 1078 BUG_ON(ret);
1079 }
85e21bac
CM		 1080next:
1081 if (path->slots[0] == 0) {
1082 if (pending_del_nr)
1083 goto del_pending;
1084 btrfs_release_path(root, path);
1085 goto search_again;
1086 }
1087
1088 path->slots[0]--;
1089 if (pending_del_nr &&
1090 path->slots[0] + 1 != pending_del_slot) {
1091 struct btrfs_key debug;
1092del_pending:
1093 btrfs_item_key_to_cpu(path->nodes[0], &debug,
1094 pending_del_slot);
1095 ret = btrfs_del_items(trans, root, path,
1096 pending_del_slot,
1097 pending_del_nr);
1098 BUG_ON(ret);
1099 pending_del_nr = 0;
1100 btrfs_release_path(root, path);
1101 goto search_again;
1102 }
39279cc3
CM		 1103 }
1104 ret = 0;
1105error:
85e21bac
CM		 1106 if (pending_del_nr) {
1107 ret = btrfs_del_items(trans, root, path, pending_del_slot,
1108 pending_del_nr);
1109 }
39279cc3
CM		 1110 btrfs_release_path(root, path);
1111 btrfs_free_path(path);
1112 inode->i_sb->s_dirt = 1;
1113 return ret;
1114}
1115
b888db2b 1116static int btrfs_cow_one_page(struct inode *inode, struct page *page,
a52d9a80
CM		 1117 size_t zero_start)
1118{
1119 char *kaddr;
d1310b2e 1120 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
35ebb934 1121 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
b888db2b 1122 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
1832a6d5 1123 int ret = 0;
a52d9a80 1124
190662b2 1125 WARN_ON(!PageLocked(page));
b3cfa35a 1126 set_page_extent_mapped(page);
a52d9a80 1127
d1310b2e 1128 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
d1310b2e 1129 set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start,
b888db2b 1130 page_end, GFP_NOFS);
1832a6d5 1131
a52d9a80 1132 if (zero_start != PAGE_CACHE_SIZE) {
b888db2b 1133 kaddr = kmap(page);
a52d9a80
CM		 1134 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
1135 flush_dcache_page(page);
b888db2b 1136 kunmap(page);
a52d9a80 1137 }
b888db2b 1138 set_page_dirty(page);
d1310b2e 1139 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
a52d9a80 1140
a52d9a80
CM		 1141 return ret;
1142}
1143
39279cc3
CM		 1144/*
1145 * taken from block_truncate_page, but does cow as it zeros out
1146 * any bytes left in the last page in the file.
1147 */
1148static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
1149{
1150 struct inode *inode = mapping->host;
db94535d
CM		 1151 struct btrfs_root *root = BTRFS_I(inode)->root;
1152 u32 blocksize = root->sectorsize;
39279cc3
CM		 1153 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1154 unsigned offset = from & (PAGE_CACHE_SIZE-1);
1155 struct page *page;
39279cc3 1156 int ret = 0;
a52d9a80 1157 u64 page_start;
39279cc3
CM		 1158
1159 if ((offset & (blocksize - 1)) == 0)
1160 goto out;
1161
1162 ret = -ENOMEM;
1163 page = grab_cache_page(mapping, index);
1164 if (!page)
1165 goto out;
39279cc3 1166 if (!PageUptodate(page)) {
9ebefb18 1167 ret = btrfs_readpage(NULL, page);
39279cc3
CM		 1168 lock_page(page);
1169 if (!PageUptodate(page)) {
1170 ret = -EIO;
1171 goto out;
1172 }
1173 }
35ebb934 1174 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 1175
b888db2b 1176 ret = btrfs_cow_one_page(inode, page, offset);
39279cc3 1177
39279cc3
CM		 1178 unlock_page(page);
1179 page_cache_release(page);
1180out:
1181 return ret;
1182}
1183
1184static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
1185{
1186 struct inode *inode = dentry->d_inode;
1187 int err;
1188
1189 err = inode_change_ok(inode, attr);
1190 if (err)
1191 return err;
1192
1193 if (S_ISREG(inode->i_mode) &&
1194 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
1195 struct btrfs_trans_handle *trans;
1196 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 1197 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2bf5a725 1198
5f39d397 1199 u64 mask = root->sectorsize - 1;
1b0f7c29 1200 u64 hole_start = (inode->i_size + mask) & ~mask;
f392a938 1201 u64 block_end = (attr->ia_size + mask) & ~mask;
39279cc3 1202 u64 hole_size;
179e29e4 1203 u64 alloc_hint = 0;
39279cc3 1204
1b0f7c29 1205 if (attr->ia_size <= hole_start)
39279cc3
CM		 1206 goto out;
1207
1832a6d5
CM		 1208 mutex_lock(&root->fs_info->fs_mutex);
1209 err = btrfs_check_free_space(root, 1, 0);
1210 mutex_unlock(&root->fs_info->fs_mutex);
1211 if (err)
1212 goto fail;
1213
39279cc3
CM		 1214 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1215
1b0f7c29 1216 lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
5f56406a 1217 hole_size = block_end - hole_start;
39279cc3
CM		 1218
1219 mutex_lock(&root->fs_info->fs_mutex);
1220 trans = btrfs_start_transaction(root, 1);
1221 btrfs_set_trans_block_group(trans, inode);
2bf5a725 1222 err = btrfs_drop_extents(trans, root, inode,
1b0f7c29 1223 hole_start, block_end, hole_start,
3326d1b0 1224 &alloc_hint);
2bf5a725 1225
179e29e4
CM		 1226 if (alloc_hint != EXTENT_MAP_INLINE) {
1227 err = btrfs_insert_file_extent(trans, root,
1228 inode->i_ino,
5f56406a
CM		 1229 hole_start, 0, 0,
1230 hole_size);
d1310b2e 1231 btrfs_drop_extent_cache(inode, hole_start,
3b951516 1232 (u64)-1);
5f56406a 1233 btrfs_check_file(root, inode);
179e29e4 1234 }
39279cc3
CM		 1235 btrfs_end_transaction(trans, root);
1236 mutex_unlock(&root->fs_info->fs_mutex);
1b0f7c29 1237 unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
54aa1f4d
CM		 1238 if (err)
1239 return err;
39279cc3
CM		 1240 }
1241out:
1242 err = inode_setattr(inode, attr);
1832a6d5 1243fail:
39279cc3
CM		 1244 return err;
1245}
61295eb8 1246
2da98f00 1247void btrfs_put_inode(struct inode *inode)
61295eb8 1248{
2da98f00
CM		 1249 int ret;
1250
1251 if (!BTRFS_I(inode)->ordered_trans) {
61295eb8
CM		 1252 return;
1253 }
2da98f00
CM		 1254
1255 if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
1256 mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))
1257 return;
1258
1259 ret = btrfs_del_ordered_inode(inode);
1260 if (ret == 1) {
1261 atomic_dec(&inode->i_count);
1262 }
61295eb8
CM		 1263}
1264
39279cc3
CM		 1265void btrfs_delete_inode(struct inode *inode)
1266{
1267 struct btrfs_trans_handle *trans;
1268 struct btrfs_root *root = BTRFS_I(inode)->root;
d3c2fdcf 1269 unsigned long nr;
39279cc3
CM		 1270 int ret;
1271
1272 truncate_inode_pages(&inode->i_data, 0);
1273 if (is_bad_inode(inode)) {
1274 goto no_delete;
1275 }
5f39d397 1276
39279cc3
CM		 1277 inode->i_size = 0;
1278 mutex_lock(&root->fs_info->fs_mutex);
1279 trans = btrfs_start_transaction(root, 1);
5f39d397 1280
39279cc3 1281 btrfs_set_trans_block_group(trans, inode);
85e21bac 1282 ret = btrfs_truncate_in_trans(trans, root, inode, 0);
54aa1f4d
CM		 1283 if (ret)
1284 goto no_delete_lock;
85e21bac 1285
d3c2fdcf 1286 nr = trans->blocks_used;
85e21bac 1287 clear_inode(inode);
5f39d397 1288
39279cc3
CM		 1289 btrfs_end_transaction(trans, root);
1290 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1291 btrfs_btree_balance_dirty(root, nr);
e2008b61 1292 btrfs_throttle(root);
39279cc3 1293 return;
54aa1f4d
CM		 1294
1295no_delete_lock:
d3c2fdcf 1296 nr = trans->blocks_used;
54aa1f4d
CM		 1297 btrfs_end_transaction(trans, root);
1298 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1299 btrfs_btree_balance_dirty(root, nr);
e2008b61 1300 btrfs_throttle(root);
39279cc3
CM		 1301no_delete:
1302 clear_inode(inode);
1303}
1304
1305/*
1306 * this returns the key found in the dir entry in the location pointer.
1307 * If no dir entries were found, location->objectid is 0.
1308 */
1309static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1310 struct btrfs_key *location)
1311{
1312 const char *name = dentry->d_name.name;
1313 int namelen = dentry->d_name.len;
1314 struct btrfs_dir_item *di;
1315 struct btrfs_path *path;
1316 struct btrfs_root *root = BTRFS_I(dir)->root;
0d9f7f3e 1317 int ret = 0;
39279cc3 1318
3954401f
CM		 1319 if (namelen == 1 && strcmp(name, ".") == 0) {
1320 location->objectid = dir->i_ino;
1321 location->type = BTRFS_INODE_ITEM_KEY;
1322 location->offset = 0;
1323 return 0;
1324 }
39279cc3
CM		 1325 path = btrfs_alloc_path();
1326 BUG_ON(!path);
3954401f 1327
7a720536 1328 if (namelen == 2 && strcmp(name, "..") == 0) {
3954401f
CM		 1329 struct btrfs_key key;
1330 struct extent_buffer *leaf;
1331 u32 nritems;
1332 int slot;
1333
1334 key.objectid = dir->i_ino;
1335 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1336 key.offset = 0;
1337 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1338 BUG_ON(ret == 0);
1339 ret = 0;
1340
1341 leaf = path->nodes[0];
1342 slot = path->slots[0];
1343 nritems = btrfs_header_nritems(leaf);
1344 if (slot >= nritems)
1345 goto out_err;
1346
1347 btrfs_item_key_to_cpu(leaf, &key, slot);
1348 if (key.objectid != dir->i_ino ||
1349 key.type != BTRFS_INODE_REF_KEY) {
1350 goto out_err;
1351 }
1352 location->objectid = key.offset;
1353 location->type = BTRFS_INODE_ITEM_KEY;
1354 location->offset = 0;
1355 goto out;
1356 }
1357
39279cc3
CM		 1358 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1359 namelen, 0);
0d9f7f3e
Y		 1360 if (IS_ERR(di))
1361 ret = PTR_ERR(di);
39279cc3 1362 if (!di || IS_ERR(di)) {
3954401f 1363 goto out_err;
39279cc3 1364 }
5f39d397 1365 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
39279cc3 1366out:
39279cc3
CM		 1367 btrfs_free_path(path);
1368 return ret;
3954401f
CM		 1369out_err:
1370 location->objectid = 0;
1371 goto out;
39279cc3
CM		 1372}
1373
1374/*
1375 * when we hit a tree root in a directory, the btrfs part of the inode
1376 * needs to be changed to reflect the root directory of the tree root. This
1377 * is kind of like crossing a mount point.
1378 */
1379static int fixup_tree_root_location(struct btrfs_root *root,
1380 struct btrfs_key *location,
58176a96
JB		 1381 struct btrfs_root **sub_root,
1382 struct dentry *dentry)
39279cc3
CM		 1383{
1384 struct btrfs_path *path;
1385 struct btrfs_root_item *ri;
1386
1387 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1388 return 0;
1389 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1390 return 0;
1391
1392 path = btrfs_alloc_path();
1393 BUG_ON(!path);
1394 mutex_lock(&root->fs_info->fs_mutex);
1395
58176a96
JB		 1396 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1397 dentry->d_name.name,
1398 dentry->d_name.len);
39279cc3
CM		 1399 if (IS_ERR(*sub_root))
1400 return PTR_ERR(*sub_root);
1401
1402 ri = &(*sub_root)->root_item;
1403 location->objectid = btrfs_root_dirid(ri);
39279cc3
CM		 1404 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1405 location->offset = 0;
1406
1407 btrfs_free_path(path);
1408 mutex_unlock(&root->fs_info->fs_mutex);
1409 return 0;
1410}
1411
1412static int btrfs_init_locked_inode(struct inode *inode, void *p)
1413{
1414 struct btrfs_iget_args *args = p;
1415 inode->i_ino = args->ino;
1416 BTRFS_I(inode)->root = args->root;
9069218d 1417 BTRFS_I(inode)->delalloc_bytes = 0;
d1310b2e
CM		 1418 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1419 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
b888db2b 1420 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 1421 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1422 inode->i_mapping, GFP_NOFS);
81d7ed29 1423 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
39279cc3
CM		 1424 return 0;
1425}
1426
1427static int btrfs_find_actor(struct inode *inode, void *opaque)
1428{
1429 struct btrfs_iget_args *args = opaque;
1430 return (args->ino == inode->i_ino &&
1431 args->root == BTRFS_I(inode)->root);
1432}
1433
dc17ff8f
CM		 1434struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1435 u64 root_objectid)
1436{
1437 struct btrfs_iget_args args;
1438 args.ino = objectid;
1439 args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);
1440
1441 if (!args.root)
1442 return NULL;
1443
1444 return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
1445}
1446
39279cc3
CM		 1447struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1448 struct btrfs_root *root)
1449{
1450 struct inode *inode;
1451 struct btrfs_iget_args args;
1452 args.ino = objectid;
1453 args.root = root;
1454
1455 inode = iget5_locked(s, objectid, btrfs_find_actor,
1456 btrfs_init_locked_inode,
1457 (void *)&args);
1458 return inode;
1459}
1460
1461static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1462 struct nameidata *nd)
1463{
1464 struct inode * inode;
1465 struct btrfs_inode *bi = BTRFS_I(dir);
1466 struct btrfs_root *root = bi->root;
1467 struct btrfs_root *sub_root = root;
1468 struct btrfs_key location;
1469 int ret;
1470
1471 if (dentry->d_name.len > BTRFS_NAME_LEN)
1472 return ERR_PTR(-ENAMETOOLONG);
5f39d397 1473
39279cc3
CM		 1474 mutex_lock(&root->fs_info->fs_mutex);
1475 ret = btrfs_inode_by_name(dir, dentry, &location);
1476 mutex_unlock(&root->fs_info->fs_mutex);
5f39d397 1477
39279cc3
CM		 1478 if (ret < 0)
1479 return ERR_PTR(ret);
5f39d397 1480
39279cc3
CM		 1481 inode = NULL;
1482 if (location.objectid) {
58176a96
JB		 1483 ret = fixup_tree_root_location(root, &location, &sub_root,
1484 dentry);
39279cc3
CM		 1485 if (ret < 0)
1486 return ERR_PTR(ret);
1487 if (ret > 0)
1488 return ERR_PTR(-ENOENT);
1489 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1490 sub_root);
1491 if (!inode)
1492 return ERR_PTR(-EACCES);
1493 if (inode->i_state & I_NEW) {
1494 /* the inode and parent dir are two different roots */
1495 if (sub_root != root) {
1496 igrab(inode);
1497 sub_root->inode = inode;
1498 }
1499 BTRFS_I(inode)->root = sub_root;
1500 memcpy(&BTRFS_I(inode)->location, &location,
1501 sizeof(location));
1502 btrfs_read_locked_inode(inode);
1503 unlock_new_inode(inode);
1504 }
1505 }
1506 return d_splice_alias(inode, dentry);
1507}
1508
39279cc3
CM		 1509static unsigned char btrfs_filetype_table[] = {
1510 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1511};
1512
1513static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1514{
6da6abae 1515 struct inode *inode = filp->f_dentry->d_inode;
39279cc3
CM		 1516 struct btrfs_root *root = BTRFS_I(inode)->root;
1517 struct btrfs_item *item;
1518 struct btrfs_dir_item *di;
1519 struct btrfs_key key;
5f39d397 1520 struct btrfs_key found_key;
39279cc3
CM		 1521 struct btrfs_path *path;
1522 int ret;
1523 u32 nritems;
5f39d397 1524 struct extent_buffer *leaf;
39279cc3
CM		 1525 int slot;
1526 int advance;
1527 unsigned char d_type;
1528 int over = 0;
1529 u32 di_cur;
1530 u32 di_total;
1531 u32 di_len;
1532 int key_type = BTRFS_DIR_INDEX_KEY;
5f39d397
CM		 1533 char tmp_name[32];
1534 char *name_ptr;
1535 int name_len;
39279cc3
CM		 1536
1537 /* FIXME, use a real flag for deciding about the key type */
1538 if (root->fs_info->tree_root == root)
1539 key_type = BTRFS_DIR_ITEM_KEY;
5f39d397 1540
3954401f
CM		 1541 /* special case for "." */
1542 if (filp->f_pos == 0) {
1543 over = filldir(dirent, ".", 1,
1544 1, inode->i_ino,
1545 DT_DIR);
1546 if (over)
1547 return 0;
1548 filp->f_pos = 1;
1549 }
1550
39279cc3
CM		 1551 mutex_lock(&root->fs_info->fs_mutex);
1552 key.objectid = inode->i_ino;
3954401f
CM		 1553 path = btrfs_alloc_path();
1554 path->reada = 2;
1555
1556 /* special case for .., just use the back ref */
1557 if (filp->f_pos == 1) {
1558 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1559 key.offset = 0;
1560 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1561 BUG_ON(ret == 0);
1562 leaf = path->nodes[0];
1563 slot = path->slots[0];
1564 nritems = btrfs_header_nritems(leaf);
1565 if (slot >= nritems) {
1566 btrfs_release_path(root, path);
1567 goto read_dir_items;
1568 }
1569 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1570 btrfs_release_path(root, path);
1571 if (found_key.objectid != key.objectid ||
1572 found_key.type != BTRFS_INODE_REF_KEY)
1573 goto read_dir_items;
1574 over = filldir(dirent, "..", 2,
1575 2, found_key.offset, DT_DIR);
1576 if (over)
1577 goto nopos;
1578 filp->f_pos = 2;
1579 }
1580
1581read_dir_items:
39279cc3
CM		 1582 btrfs_set_key_type(&key, key_type);
1583 key.offset = filp->f_pos;
5f39d397 1584
39279cc3
CM		 1585 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1586 if (ret < 0)
1587 goto err;
1588 advance = 0;
39279cc3 1589 while(1) {
5f39d397
CM		 1590 leaf = path->nodes[0];
1591 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1592 slot = path->slots[0];
1593 if (advance || slot >= nritems) {
1594 if (slot >= nritems -1) {
39279cc3
CM		 1595 ret = btrfs_next_leaf(root, path);
1596 if (ret)
1597 break;
5f39d397
CM		 1598 leaf = path->nodes[0];
1599 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1600 slot = path->slots[0];
1601 } else {
1602 slot++;
1603 path->slots[0]++;
1604 }
1605 }
1606 advance = 1;
5f39d397
CM		 1607 item = btrfs_item_nr(leaf, slot);
1608 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1609
1610 if (found_key.objectid != key.objectid)
39279cc3 1611 break;
5f39d397 1612 if (btrfs_key_type(&found_key) != key_type)
39279cc3 1613 break;
5f39d397 1614 if (found_key.offset < filp->f_pos)
39279cc3 1615 continue;
5f39d397
CM		 1616
1617 filp->f_pos = found_key.offset;
39279cc3
CM		 1618 advance = 1;
1619 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1620 di_cur = 0;
5f39d397 1621 di_total = btrfs_item_size(leaf, item);
39279cc3 1622 while(di_cur < di_total) {
5f39d397
CM		 1623 struct btrfs_key location;
1624
1625 name_len = btrfs_dir_name_len(leaf, di);
1626 if (name_len < 32) {
1627 name_ptr = tmp_name;
1628 } else {
1629 name_ptr = kmalloc(name_len, GFP_NOFS);
1630 BUG_ON(!name_ptr);
1631 }
1632 read_extent_buffer(leaf, name_ptr,
1633 (unsigned long)(di + 1), name_len);
1634
1635 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1636 btrfs_dir_item_key_to_cpu(leaf, di, &location);
5f39d397
CM		 1637 over = filldir(dirent, name_ptr, name_len,
1638 found_key.offset,
1639 location.objectid,
39279cc3 1640 d_type);
5f39d397
CM		 1641
1642 if (name_ptr != tmp_name)
1643 kfree(name_ptr);
1644
39279cc3
CM		 1645 if (over)
1646 goto nopos;
5103e947
JB		 1647 di_len = btrfs_dir_name_len(leaf, di) +
1648 btrfs_dir_data_len(leaf, di) +sizeof(*di);
39279cc3
CM		 1649 di_cur += di_len;
1650 di = (struct btrfs_dir_item *)((char *)di + di_len);
1651 }
1652 }
5e591a07
YZ		 1653 if (key_type == BTRFS_DIR_INDEX_KEY)
1654 filp->f_pos = INT_LIMIT(typeof(filp->f_pos));
1655 else
1656 filp->f_pos++;
39279cc3
CM		 1657nopos:
1658 ret = 0;
1659err:
1660 btrfs_release_path(root, path);
1661 btrfs_free_path(path);
1662 mutex_unlock(&root->fs_info->fs_mutex);
1663 return ret;
1664}
1665
1666int btrfs_write_inode(struct inode *inode, int wait)
1667{
1668 struct btrfs_root *root = BTRFS_I(inode)->root;
1669 struct btrfs_trans_handle *trans;
1670 int ret = 0;
1671
1672 if (wait) {
1673 mutex_lock(&root->fs_info->fs_mutex);
1674 trans = btrfs_start_transaction(root, 1);
1675 btrfs_set_trans_block_group(trans, inode);
1676 ret = btrfs_commit_transaction(trans, root);
1677 mutex_unlock(&root->fs_info->fs_mutex);
1678 }
1679 return ret;
1680}
1681
1682/*
54aa1f4d 1683 * This is somewhat expensive, updating the tree every time the
39279cc3
CM		 1684 * inode changes. But, it is most likely to find the inode in cache.
1685 * FIXME, needs more benchmarking...there are no reasons other than performance
1686 * to keep or drop this code.
1687 */
1688void btrfs_dirty_inode(struct inode *inode)
1689{
1690 struct btrfs_root *root = BTRFS_I(inode)->root;
1691 struct btrfs_trans_handle *trans;
1692
1693 mutex_lock(&root->fs_info->fs_mutex);
1694 trans = btrfs_start_transaction(root, 1);
1695 btrfs_set_trans_block_group(trans, inode);
1696 btrfs_update_inode(trans, root, inode);
1697 btrfs_end_transaction(trans, root);
1698 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 1699}
1700
1701static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1702 struct btrfs_root *root,
9c58309d
CM		 1703 const char *name, int name_len,
1704 u64 ref_objectid,
39279cc3
CM		 1705 u64 objectid,
1706 struct btrfs_block_group_cache *group,
1707 int mode)
1708{
1709 struct inode *inode;
5f39d397 1710 struct btrfs_inode_item *inode_item;
6324fbf3 1711 struct btrfs_block_group_cache *new_inode_group;
39279cc3 1712 struct btrfs_key *location;
5f39d397 1713 struct btrfs_path *path;
9c58309d
CM		 1714 struct btrfs_inode_ref *ref;
1715 struct btrfs_key key[2];
1716 u32 sizes[2];
1717 unsigned long ptr;
39279cc3
CM		 1718 int ret;
1719 int owner;
1720
5f39d397
CM		 1721 path = btrfs_alloc_path();
1722 BUG_ON(!path);
1723
39279cc3
CM		 1724 inode = new_inode(root->fs_info->sb);
1725 if (!inode)
1726 return ERR_PTR(-ENOMEM);
1727
d1310b2e
CM		 1728 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1729 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
b888db2b 1730 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 1731 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1732 inode->i_mapping, GFP_NOFS);
81d7ed29 1733 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
9069218d 1734 BTRFS_I(inode)->delalloc_bytes = 0;
39279cc3 1735 BTRFS_I(inode)->root = root;
b888db2b 1736
39279cc3
CM		 1737 if (mode & S_IFDIR)
1738 owner = 0;
1739 else
1740 owner = 1;
6324fbf3 1741 new_inode_group = btrfs_find_block_group(root, group, 0,
0b86a832 1742 BTRFS_BLOCK_GROUP_METADATA, owner);
6324fbf3
CM		 1743 if (!new_inode_group) {
1744 printk("find_block group failed\n");
1745 new_inode_group = group;
1746 }
1747 BTRFS_I(inode)->block_group = new_inode_group;
b98b6767 1748 BTRFS_I(inode)->flags = 0;
9c58309d
CM		 1749
1750 key[0].objectid = objectid;
1751 btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY);
1752 key[0].offset = 0;
1753
1754 key[1].objectid = objectid;
1755 btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY);
1756 key[1].offset = ref_objectid;
1757
1758 sizes[0] = sizeof(struct btrfs_inode_item);
1759 sizes[1] = name_len + sizeof(*ref);
1760
1761 ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2);
1762 if (ret != 0)
5f39d397
CM		 1763 goto fail;
1764
9c58309d
CM		 1765 if (objectid > root->highest_inode)
1766 root->highest_inode = objectid;
1767
39279cc3
CM		 1768 inode->i_uid = current->fsuid;
1769 inode->i_gid = current->fsgid;
1770 inode->i_mode = mode;
1771 inode->i_ino = objectid;
1772 inode->i_blocks = 0;
1773 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
5f39d397
CM		 1774 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1775 struct btrfs_inode_item);
1776 fill_inode_item(path->nodes[0], inode_item, inode);
9c58309d
CM		 1777
1778 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
1779 struct btrfs_inode_ref);
1780 btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
1781 ptr = (unsigned long)(ref + 1);
1782 write_extent_buffer(path->nodes[0], name, ptr, name_len);
1783
5f39d397
CM		 1784 btrfs_mark_buffer_dirty(path->nodes[0]);
1785 btrfs_free_path(path);
1786
39279cc3
CM		 1787 location = &BTRFS_I(inode)->location;
1788 location->objectid = objectid;
39279cc3
CM		 1789 location->offset = 0;
1790 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1791
39279cc3
CM		 1792 insert_inode_hash(inode);
1793 return inode;
5f39d397
CM		 1794fail:
1795 btrfs_free_path(path);
1796 return ERR_PTR(ret);
39279cc3
CM		 1797}
1798
1799static inline u8 btrfs_inode_type(struct inode *inode)
1800{
1801 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1802}
1803
1804static int btrfs_add_link(struct btrfs_trans_handle *trans,
9c58309d
CM		 1805 struct dentry *dentry, struct inode *inode,
1806 int add_backref)
39279cc3
CM		 1807{
1808 int ret;
1809 struct btrfs_key key;
1810 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
79c44584 1811 struct inode *parent_inode;
5f39d397 1812
39279cc3 1813 key.objectid = inode->i_ino;
39279cc3
CM		 1814 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1815 key.offset = 0;
1816
1817 ret = btrfs_insert_dir_item(trans, root,
1818 dentry->d_name.name, dentry->d_name.len,
1819 dentry->d_parent->d_inode->i_ino,
1820 &key, btrfs_inode_type(inode));
1821 if (ret == 0) {
9c58309d
CM		 1822 if (add_backref) {
1823 ret = btrfs_insert_inode_ref(trans, root,
1824 dentry->d_name.name,
1825 dentry->d_name.len,
1826 inode->i_ino,
1827 dentry->d_parent->d_inode->i_ino);
1828 }
79c44584
CM		 1829 parent_inode = dentry->d_parent->d_inode;
1830 parent_inode->i_size += dentry->d_name.len * 2;
1831 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
39279cc3
CM		 1832 ret = btrfs_update_inode(trans, root,
1833 dentry->d_parent->d_inode);
1834 }
1835 return ret;
1836}
1837
1838static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
9c58309d
CM		 1839 struct dentry *dentry, struct inode *inode,
1840 int backref)
39279cc3 1841{
9c58309d 1842 int err = btrfs_add_link(trans, dentry, inode, backref);
39279cc3
CM		 1843 if (!err) {
1844 d_instantiate(dentry, inode);
1845 return 0;
1846 }
1847 if (err > 0)
1848 err = -EEXIST;
1849 return err;
1850}
1851
618e21d5
JB		 1852static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1853 int mode, dev_t rdev)
1854{
1855 struct btrfs_trans_handle *trans;
1856 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1857 struct inode *inode = NULL;
618e21d5
JB		 1858 int err;
1859 int drop_inode = 0;
1860 u64 objectid;
1832a6d5 1861 unsigned long nr = 0;
618e21d5
JB		 1862
1863 if (!new_valid_dev(rdev))
1864 return -EINVAL;
1865
1866 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1867 err = btrfs_check_free_space(root, 1, 0);
1868 if (err)
1869 goto fail;
1870
618e21d5
JB		 1871 trans = btrfs_start_transaction(root, 1);
1872 btrfs_set_trans_block_group(trans, dir);
1873
1874 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1875 if (err) {
1876 err = -ENOSPC;
1877 goto out_unlock;
1878 }
1879
9c58309d
CM		 1880 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1881 dentry->d_name.len,
1882 dentry->d_parent->d_inode->i_ino, objectid,
618e21d5
JB		 1883 BTRFS_I(dir)->block_group, mode);
1884 err = PTR_ERR(inode);
1885 if (IS_ERR(inode))
1886 goto out_unlock;
1887
1888 btrfs_set_trans_block_group(trans, inode);
9c58309d 1889 err = btrfs_add_nondir(trans, dentry, inode, 0);
618e21d5
JB		 1890 if (err)
1891 drop_inode = 1;
1892 else {
1893 inode->i_op = &btrfs_special_inode_operations;
1894 init_special_inode(inode, inode->i_mode, rdev);
1b4ab1bb 1895 btrfs_update_inode(trans, root, inode);
618e21d5
JB		 1896 }
1897 dir->i_sb->s_dirt = 1;
1898 btrfs_update_inode_block_group(trans, inode);
1899 btrfs_update_inode_block_group(trans, dir);
1900out_unlock:
d3c2fdcf 1901 nr = trans->blocks_used;
618e21d5 1902 btrfs_end_transaction(trans, root);
1832a6d5 1903fail:
618e21d5
JB		 1904 mutex_unlock(&root->fs_info->fs_mutex);
1905
1906 if (drop_inode) {
1907 inode_dec_link_count(inode);
1908 iput(inode);
1909 }
d3c2fdcf 1910 btrfs_btree_balance_dirty(root, nr);
e2008b61 1911 btrfs_throttle(root);
618e21d5
JB		 1912 return err;
1913}
1914
39279cc3
CM		 1915static int btrfs_create(struct inode *dir, struct dentry *dentry,
1916 int mode, struct nameidata *nd)
1917{
1918 struct btrfs_trans_handle *trans;
1919 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1920 struct inode *inode = NULL;
39279cc3
CM		 1921 int err;
1922 int drop_inode = 0;
1832a6d5 1923 unsigned long nr = 0;
39279cc3
CM		 1924 u64 objectid;
1925
1926 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1927 err = btrfs_check_free_space(root, 1, 0);
1928 if (err)
1929 goto fail;
39279cc3
CM		 1930 trans = btrfs_start_transaction(root, 1);
1931 btrfs_set_trans_block_group(trans, dir);
1932
1933 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1934 if (err) {
1935 err = -ENOSPC;
1936 goto out_unlock;
1937 }
1938
9c58309d
CM		 1939 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1940 dentry->d_name.len,
1941 dentry->d_parent->d_inode->i_ino,
1942 objectid, BTRFS_I(dir)->block_group, mode);
39279cc3
CM		 1943 err = PTR_ERR(inode);
1944 if (IS_ERR(inode))
1945 goto out_unlock;
1946
1947 btrfs_set_trans_block_group(trans, inode);
9c58309d 1948 err = btrfs_add_nondir(trans, dentry, inode, 0);
39279cc3
CM		 1949 if (err)
1950 drop_inode = 1;
1951 else {
1952 inode->i_mapping->a_ops = &btrfs_aops;
04160088 1953 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3
CM		 1954 inode->i_fop = &btrfs_file_operations;
1955 inode->i_op = &btrfs_file_inode_operations;
d1310b2e
CM		 1956 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1957 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
a52d9a80 1958 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 1959 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1960 inode->i_mapping, GFP_NOFS);
9069218d 1961 BTRFS_I(inode)->delalloc_bytes = 0;
81d7ed29 1962 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
d1310b2e 1963 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 1964 }
1965 dir->i_sb->s_dirt = 1;
1966 btrfs_update_inode_block_group(trans, inode);
1967 btrfs_update_inode_block_group(trans, dir);
1968out_unlock:
d3c2fdcf 1969 nr = trans->blocks_used;
39279cc3 1970 btrfs_end_transaction(trans, root);
1832a6d5 1971fail:
39279cc3
CM		 1972 mutex_unlock(&root->fs_info->fs_mutex);
1973
1974 if (drop_inode) {
1975 inode_dec_link_count(inode);
1976 iput(inode);
1977 }
d3c2fdcf 1978 btrfs_btree_balance_dirty(root, nr);
e2008b61 1979 btrfs_throttle(root);
39279cc3
CM		 1980 return err;
1981}
1982
1983static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1984 struct dentry *dentry)
1985{
1986 struct btrfs_trans_handle *trans;
1987 struct btrfs_root *root = BTRFS_I(dir)->root;
1988 struct inode *inode = old_dentry->d_inode;
1832a6d5 1989 unsigned long nr = 0;
39279cc3
CM		 1990 int err;
1991 int drop_inode = 0;
1992
1993 if (inode->i_nlink == 0)
1994 return -ENOENT;
1995
6da6abae
CM		 1996#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1997 inode->i_nlink++;
1998#else
39279cc3 1999 inc_nlink(inode);
6da6abae 2000#endif
39279cc3 2001 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2002 err = btrfs_check_free_space(root, 1, 0);
2003 if (err)
2004 goto fail;
39279cc3 2005 trans = btrfs_start_transaction(root, 1);
5f39d397 2006
39279cc3
CM		 2007 btrfs_set_trans_block_group(trans, dir);
2008 atomic_inc(&inode->i_count);
9c58309d 2009 err = btrfs_add_nondir(trans, dentry, inode, 1);
5f39d397 2010
39279cc3
CM		 2011 if (err)
2012 drop_inode = 1;
5f39d397 2013
39279cc3
CM		 2014 dir->i_sb->s_dirt = 1;
2015 btrfs_update_inode_block_group(trans, dir);
54aa1f4d 2016 err = btrfs_update_inode(trans, root, inode);
5f39d397 2017
54aa1f4d
CM		 2018 if (err)
2019 drop_inode = 1;
39279cc3 2020
d3c2fdcf 2021 nr = trans->blocks_used;
39279cc3 2022 btrfs_end_transaction(trans, root);
1832a6d5 2023fail:
39279cc3
CM		 2024 mutex_unlock(&root->fs_info->fs_mutex);
2025
2026 if (drop_inode) {
2027 inode_dec_link_count(inode);
2028 iput(inode);
2029 }
d3c2fdcf 2030 btrfs_btree_balance_dirty(root, nr);
e2008b61 2031 btrfs_throttle(root);
39279cc3
CM		 2032 return err;
2033}
2034
39279cc3
CM		 2035static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
2036{
2037 struct inode *inode;
2038 struct btrfs_trans_handle *trans;
2039 struct btrfs_root *root = BTRFS_I(dir)->root;
2040 int err = 0;
2041 int drop_on_err = 0;
2042 u64 objectid;
d3c2fdcf 2043 unsigned long nr = 1;
39279cc3
CM		 2044
2045 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2046 err = btrfs_check_free_space(root, 1, 0);
2047 if (err)
2048 goto out_unlock;
2049
39279cc3
CM		 2050 trans = btrfs_start_transaction(root, 1);
2051 btrfs_set_trans_block_group(trans, dir);
5f39d397 2052
39279cc3
CM		 2053 if (IS_ERR(trans)) {
2054 err = PTR_ERR(trans);
2055 goto out_unlock;
2056 }
2057
2058 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2059 if (err) {
2060 err = -ENOSPC;
2061 goto out_unlock;
2062 }
2063
9c58309d
CM		 2064 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
2065 dentry->d_name.len,
2066 dentry->d_parent->d_inode->i_ino, objectid,
39279cc3
CM		 2067 BTRFS_I(dir)->block_group, S_IFDIR | mode);
2068 if (IS_ERR(inode)) {
2069 err = PTR_ERR(inode);
2070 goto out_fail;
2071 }
5f39d397 2072
39279cc3
CM		 2073 drop_on_err = 1;
2074 inode->i_op = &btrfs_dir_inode_operations;
2075 inode->i_fop = &btrfs_dir_file_operations;
2076 btrfs_set_trans_block_group(trans, inode);
2077
3954401f 2078 inode->i_size = 0;
39279cc3
CM		 2079 err = btrfs_update_inode(trans, root, inode);
2080 if (err)
2081 goto out_fail;
5f39d397 2082
9c58309d 2083 err = btrfs_add_link(trans, dentry, inode, 0);
39279cc3
CM		 2084 if (err)
2085 goto out_fail;
5f39d397 2086
39279cc3
CM		 2087 d_instantiate(dentry, inode);
2088 drop_on_err = 0;
2089 dir->i_sb->s_dirt = 1;
2090 btrfs_update_inode_block_group(trans, inode);
2091 btrfs_update_inode_block_group(trans, dir);
2092
2093out_fail:
d3c2fdcf 2094 nr = trans->blocks_used;
39279cc3 2095 btrfs_end_transaction(trans, root);
5f39d397 2096
39279cc3
CM		 2097out_unlock:
2098 mutex_unlock(&root->fs_info->fs_mutex);
2099 if (drop_on_err)
2100 iput(inode);
d3c2fdcf 2101 btrfs_btree_balance_dirty(root, nr);
e2008b61 2102 btrfs_throttle(root);
39279cc3
CM		 2103 return err;
2104}
2105
3b951516
CM		 2106static int merge_extent_mapping(struct extent_map_tree *em_tree,
2107 struct extent_map *existing,
2108 struct extent_map *em)
2109{
2110 u64 start_diff;
2111 u64 new_end;
2112 int ret = 0;
2113 int real_blocks = existing->block_start < EXTENT_MAP_LAST_BYTE;
2114
2115 if (real_blocks && em->block_start >= EXTENT_MAP_LAST_BYTE)
2116 goto invalid;
2117
2118 if (!real_blocks && em->block_start != existing->block_start)
2119 goto invalid;
2120
2121 new_end = max(existing->start + existing->len, em->start + em->len);
2122
2123 if (existing->start >= em->start) {
2124 if (em->start + em->len < existing->start)
2125 goto invalid;
2126
2127 start_diff = existing->start - em->start;
2128 if (real_blocks && em->block_start + start_diff !=
2129 existing->block_start)
2130 goto invalid;
2131
2132 em->len = new_end - em->start;
2133
2134 remove_extent_mapping(em_tree, existing);
2135 /* free for the tree */
2136 free_extent_map(existing);
2137 ret = add_extent_mapping(em_tree, em);
2138
2139 } else if (em->start > existing->start) {
2140
2141 if (existing->start + existing->len < em->start)
2142 goto invalid;
2143
2144 start_diff = em->start - existing->start;
2145 if (real_blocks && existing->block_start + start_diff !=
2146 em->block_start)
2147 goto invalid;
2148
2149 remove_extent_mapping(em_tree, existing);
2150 em->block_start = existing->block_start;
2151 em->start = existing->start;
2152 em->len = new_end - existing->start;
2153 free_extent_map(existing);
2154
2155 ret = add_extent_mapping(em_tree, em);
2156 } else {
2157 goto invalid;
2158 }
2159 return ret;
2160
2161invalid:
2162 printk("invalid extent map merge [%Lu %Lu %Lu] [%Lu %Lu %Lu]\n",
2163 existing->start, existing->len, existing->block_start,
2164 em->start, em->len, em->block_start);
2165 return -EIO;
2166}
2167
a52d9a80 2168struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
70dec807 2169 size_t pg_offset, u64 start, u64 len,
a52d9a80
CM		 2170 int create)
2171{
2172 int ret;
2173 int err = 0;
db94535d 2174 u64 bytenr;
a52d9a80
CM		 2175 u64 extent_start = 0;
2176 u64 extent_end = 0;
2177 u64 objectid = inode->i_ino;
2178 u32 found_type;
a52d9a80
CM		 2179 struct btrfs_path *path;
2180 struct btrfs_root *root = BTRFS_I(inode)->root;
2181 struct btrfs_file_extent_item *item;
5f39d397
CM		 2182 struct extent_buffer *leaf;
2183 struct btrfs_key found_key;
a52d9a80
CM		 2184 struct extent_map *em = NULL;
2185 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
d1310b2e 2186 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
a52d9a80
CM		 2187 struct btrfs_trans_handle *trans = NULL;
2188
2189 path = btrfs_alloc_path();
2190 BUG_ON(!path);
2191 mutex_lock(&root->fs_info->fs_mutex);
2192
2193again:
d1310b2e
CM		 2194 spin_lock(&em_tree->lock);
2195 em = lookup_extent_mapping(em_tree, start, len);
2196 spin_unlock(&em_tree->lock);
2197
a52d9a80 2198 if (em) {
e1c4b745
CM		 2199 if (em->start > start || em->start + em->len <= start)
2200 free_extent_map(em);
2201 else if (em->block_start == EXTENT_MAP_INLINE && page)
70dec807
CM		 2202 free_extent_map(em);
2203 else
2204 goto out;
a52d9a80 2205 }
d1310b2e 2206 em = alloc_extent_map(GFP_NOFS);
a52d9a80 2207 if (!em) {
d1310b2e
CM		 2208 err = -ENOMEM;
2209 goto out;
a52d9a80 2210 }
d1310b2e
CM		 2211
2212 em->start = EXTENT_MAP_HOLE;
2213 em->len = (u64)-1;
a52d9a80 2214 em->bdev = inode->i_sb->s_bdev;
179e29e4
CM		 2215 ret = btrfs_lookup_file_extent(trans, root, path,
2216 objectid, start, trans != NULL);
a52d9a80
CM		 2217 if (ret < 0) {
2218 err = ret;
2219 goto out;
2220 }
2221
2222 if (ret != 0) {
2223 if (path->slots[0] == 0)
2224 goto not_found;
2225 path->slots[0]--;
2226 }
2227
5f39d397
CM		 2228 leaf = path->nodes[0];
2229 item = btrfs_item_ptr(leaf, path->slots[0],
a52d9a80 2230 struct btrfs_file_extent_item);
a52d9a80 2231 /* are we inside the extent that was found? */
5f39d397
CM		 2232 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2233 found_type = btrfs_key_type(&found_key);
2234 if (found_key.objectid != objectid ||
a52d9a80
CM		 2235 found_type != BTRFS_EXTENT_DATA_KEY) {
2236 goto not_found;
2237 }
2238
5f39d397
CM		 2239 found_type = btrfs_file_extent_type(leaf, item);
2240 extent_start = found_key.offset;
a52d9a80
CM		 2241 if (found_type == BTRFS_FILE_EXTENT_REG) {
2242 extent_end = extent_start +
db94535d 2243 btrfs_file_extent_num_bytes(leaf, item);
a52d9a80 2244 err = 0;
b888db2b 2245 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 2246 em->start = start;
2247 if (start < extent_start) {
d1310b2e 2248 if (start + len <= extent_start)
b888db2b 2249 goto not_found;
d1310b2e 2250 em->len = extent_end - extent_start;
a52d9a80 2251 } else {
d1310b2e 2252 em->len = len;
a52d9a80
CM		 2253 }
2254 goto not_found_em;
2255 }
db94535d
CM		 2256 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
2257 if (bytenr == 0) {
a52d9a80 2258 em->start = extent_start;
d1310b2e 2259 em->len = extent_end - extent_start;
5f39d397 2260 em->block_start = EXTENT_MAP_HOLE;
a52d9a80
CM		 2261 goto insert;
2262 }
db94535d
CM		 2263 bytenr += btrfs_file_extent_offset(leaf, item);
2264 em->block_start = bytenr;
a52d9a80 2265 em->start = extent_start;
d1310b2e 2266 em->len = extent_end - extent_start;
a52d9a80
CM		 2267 goto insert;
2268 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
70dec807 2269 u64 page_start;
5f39d397 2270 unsigned long ptr;
a52d9a80 2271 char *map;
3326d1b0
CM		 2272 size_t size;
2273 size_t extent_offset;
2274 size_t copy_size;
a52d9a80 2275
5f39d397
CM		 2276 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
2277 path->slots[0]));
d1310b2e
CM		 2278 extent_end = (extent_start + size + root->sectorsize - 1) &
2279 ~((u64)root->sectorsize - 1);
b888db2b 2280 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 2281 em->start = start;
2282 if (start < extent_start) {
d1310b2e 2283 if (start + len <= extent_start)
b888db2b 2284 goto not_found;
d1310b2e 2285 em->len = extent_end - extent_start;
a52d9a80 2286 } else {
d1310b2e 2287 em->len = len;
a52d9a80
CM		 2288 }
2289 goto not_found_em;
2290 }
689f9346 2291 em->block_start = EXTENT_MAP_INLINE;
689f9346
Y		 2292
2293 if (!page) {
2294 em->start = extent_start;
d1310b2e 2295 em->len = size;
689f9346
Y		 2296 goto out;
2297 }
5f39d397 2298
70dec807
CM		 2299 page_start = page_offset(page) + pg_offset;
2300 extent_offset = page_start - extent_start;
2301 copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
3326d1b0 2302 size - extent_offset);
3326d1b0 2303 em->start = extent_start + extent_offset;
70dec807
CM		 2304 em->len = (copy_size + root->sectorsize - 1) &
2305 ~((u64)root->sectorsize - 1);
689f9346
Y		 2306 map = kmap(page);
2307 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
179e29e4 2308 if (create == 0 && !PageUptodate(page)) {
70dec807 2309 read_extent_buffer(leaf, map + pg_offset, ptr,
179e29e4
CM		 2310 copy_size);
2311 flush_dcache_page(page);
2312 } else if (create && PageUptodate(page)) {
2313 if (!trans) {
2314 kunmap(page);
2315 free_extent_map(em);
2316 em = NULL;
2317 btrfs_release_path(root, path);
2318 trans = btrfs_start_transaction(root, 1);
2319 goto again;
2320 }
70dec807 2321 write_extent_buffer(leaf, map + pg_offset, ptr,
179e29e4
CM		 2322 copy_size);
2323 btrfs_mark_buffer_dirty(leaf);
a52d9a80 2324 }
a52d9a80 2325 kunmap(page);
d1310b2e
CM		 2326 set_extent_uptodate(io_tree, em->start,
2327 extent_map_end(em) - 1, GFP_NOFS);
a52d9a80
CM		 2328 goto insert;
2329 } else {
2330 printk("unkknown found_type %d\n", found_type);
2331 WARN_ON(1);
2332 }
2333not_found:
2334 em->start = start;
d1310b2e 2335 em->len = len;
a52d9a80 2336not_found_em:
5f39d397 2337 em->block_start = EXTENT_MAP_HOLE;
a52d9a80
CM		 2338insert:
2339 btrfs_release_path(root, path);
d1310b2e
CM		 2340 if (em->start > start || extent_map_end(em) <= start) {
2341 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len);
a52d9a80
CM		 2342 err = -EIO;
2343 goto out;
2344 }
d1310b2e
CM		 2345
2346 err = 0;
2347 spin_lock(&em_tree->lock);
a52d9a80 2348 ret = add_extent_mapping(em_tree, em);
3b951516
CM		 2349 /* it is possible that someone inserted the extent into the tree
2350 * while we had the lock dropped. It is also possible that
2351 * an overlapping map exists in the tree
2352 */
a52d9a80 2353 if (ret == -EEXIST) {
3b951516
CM		 2354 struct extent_map *existing;
2355 existing = lookup_extent_mapping(em_tree, start, len);
e1c4b745
CM		 2356 if (existing && (existing->start > start ||
2357 existing->start + existing->len <= start)) {
2358 free_extent_map(existing);
2359 existing = NULL;
2360 }
3b951516
CM		 2361 if (!existing) {
2362 existing = lookup_extent_mapping(em_tree, em->start,
2363 em->len);
2364 if (existing) {
2365 err = merge_extent_mapping(em_tree, existing,
2366 em);
2367 free_extent_map(existing);
2368 if (err) {
2369 free_extent_map(em);
2370 em = NULL;
2371 }
2372 } else {
2373 err = -EIO;
2374 printk("failing to insert %Lu %Lu\n",
2375 start, len);
2376 free_extent_map(em);
2377 em = NULL;
2378 }
2379 } else {
2380 free_extent_map(em);
2381 em = existing;
a52d9a80 2382 }
a52d9a80 2383 }
d1310b2e 2384 spin_unlock(&em_tree->lock);
a52d9a80
CM		 2385out:
2386 btrfs_free_path(path);
2387 if (trans) {
2388 ret = btrfs_end_transaction(trans, root);
2389 if (!err)
2390 err = ret;
2391 }
2392 mutex_unlock(&root->fs_info->fs_mutex);
2393 if (err) {
2394 free_extent_map(em);
2395 WARN_ON(1);
2396 return ERR_PTR(err);
2397 }
2398 return em;
2399}
2400
e1c4b745 2401#if 0 /* waiting for O_DIRECT reads */
16432985
CM		 2402static int btrfs_get_block(struct inode *inode, sector_t iblock,
2403 struct buffer_head *bh_result, int create)
2404{
2405 struct extent_map *em;
2406 u64 start = (u64)iblock << inode->i_blkbits;
2407 struct btrfs_multi_bio *multi = NULL;
2408 struct btrfs_root *root = BTRFS_I(inode)->root;
2409 u64 len;
2410 u64 logical;
2411 u64 map_length;
2412 int ret = 0;
2413
2414 em = btrfs_get_extent(inode, NULL, 0, start, bh_result->b_size, 0);
2415
2416 if (!em || IS_ERR(em))
2417 goto out;
2418
e1c4b745 2419 if (em->start > start || em->start + em->len <= start) {
16432985 2420 goto out;
e1c4b745 2421 }
16432985
CM		 2422
2423 if (em->block_start == EXTENT_MAP_INLINE) {
2424 ret = -EINVAL;
2425 goto out;
2426 }
2427
e1c4b745
CM		 2428 len = em->start + em->len - start;
2429 len = min_t(u64, len, INT_LIMIT(typeof(bh_result->b_size)));
2430
16432985
CM		 2431 if (em->block_start == EXTENT_MAP_HOLE ||
2432 em->block_start == EXTENT_MAP_DELALLOC) {
e1c4b745 2433 bh_result->b_size = len;
16432985
CM		 2434 goto out;
2435 }
2436
16432985
CM		 2437 logical = start - em->start;
2438 logical = em->block_start + logical;
2439
2440 map_length = len;
2441 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
2442 logical, &map_length, &multi, 0);
2443 BUG_ON(ret);
2444 bh_result->b_blocknr = multi->stripes[0].physical >> inode->i_blkbits;
2445 bh_result->b_size = min(map_length, len);
e1c4b745 2446
16432985
CM		 2447 bh_result->b_bdev = multi->stripes[0].dev->bdev;
2448 set_buffer_mapped(bh_result);
2449 kfree(multi);
2450out:
2451 free_extent_map(em);
2452 return ret;
2453}
e1c4b745 2454#endif
16432985
CM		 2455
2456static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
2457 const struct iovec *iov, loff_t offset,
2458 unsigned long nr_segs)
2459{
e1c4b745
CM		 2460 return -EINVAL;
2461#if 0
16432985
CM		 2462 struct file *file = iocb->ki_filp;
2463 struct inode *inode = file->f_mapping->host;
2464
2465 if (rw == WRITE)
2466 return -EINVAL;
2467
2468 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
2469 offset, nr_segs, btrfs_get_block, NULL);
e1c4b745 2470#endif
16432985
CM		 2471}
2472
d396c6f5 2473static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
39279cc3 2474{
d396c6f5 2475 return extent_bmap(mapping, iblock, btrfs_get_extent);
39279cc3
CM		 2476}
2477
a52d9a80 2478int btrfs_readpage(struct file *file, struct page *page)
9ebefb18 2479{
d1310b2e
CM		 2480 struct extent_io_tree *tree;
2481 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80 2482 return extent_read_full_page(tree, page, btrfs_get_extent);
9ebefb18 2483}
1832a6d5 2484
a52d9a80 2485static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
39279cc3 2486{
d1310b2e 2487 struct extent_io_tree *tree;
b888db2b
CM		 2488
2489
2490 if (current->flags & PF_MEMALLOC) {
2491 redirty_page_for_writepage(wbc, page);
2492 unlock_page(page);
2493 return 0;
2494 }
d1310b2e 2495 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80 2496 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
9ebefb18
CM		 2497}
2498
b293f02e
CM		 2499static int btrfs_writepages(struct address_space *mapping,
2500 struct writeback_control *wbc)
2501{
d1310b2e
CM		 2502 struct extent_io_tree *tree;
2503 tree = &BTRFS_I(mapping->host)->io_tree;
b293f02e
CM		 2504 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2505}
2506
3ab2fb5a
CM		 2507static int
2508btrfs_readpages(struct file *file, struct address_space *mapping,
2509 struct list_head *pages, unsigned nr_pages)
2510{
d1310b2e
CM		 2511 struct extent_io_tree *tree;
2512 tree = &BTRFS_I(mapping->host)->io_tree;
3ab2fb5a
CM		 2513 return extent_readpages(tree, mapping, pages, nr_pages,
2514 btrfs_get_extent);
2515}
2516
70dec807 2517static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
9ebefb18 2518{
d1310b2e
CM		 2519 struct extent_io_tree *tree;
2520 struct extent_map_tree *map;
a52d9a80 2521 int ret;
8c2383c3 2522
d1310b2e
CM		 2523 tree = &BTRFS_I(page->mapping->host)->io_tree;
2524 map = &BTRFS_I(page->mapping->host)->extent_tree;
70dec807 2525 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
a52d9a80 2526 if (ret == 1) {
4ef64eae 2527 invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
a52d9a80
CM		 2528 ClearPagePrivate(page);
2529 set_page_private(page, 0);
2530 page_cache_release(page);
39279cc3 2531 }
a52d9a80 2532 return ret;
39279cc3
CM		 2533}
2534
a52d9a80 2535static void btrfs_invalidatepage(struct page *page, unsigned long offset)
39279cc3 2536{
d1310b2e 2537 struct extent_io_tree *tree;
39279cc3 2538
d1310b2e 2539 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80
CM		 2540 extent_invalidatepage(tree, page, offset);
2541 btrfs_releasepage(page, GFP_NOFS);
9ad6b7bc 2542 if (PagePrivate(page)) {
4ef64eae 2543 invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
9ad6b7bc
CM		 2544 ClearPagePrivate(page);
2545 set_page_private(page, 0);
2546 page_cache_release(page);
2547 }
39279cc3
CM		 2548}
2549
9ebefb18
CM		 2550/*
2551 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2552 * called from a page fault handler when a page is first dirtied. Hence we must
2553 * be careful to check for EOF conditions here. We set the page up correctly
2554 * for a written page which means we get ENOSPC checking when writing into
2555 * holes and correct delalloc and unwritten extent mapping on filesystems that
2556 * support these features.
2557 *
2558 * We are not allowed to take the i_mutex here so we have to play games to
2559 * protect against truncate races as the page could now be beyond EOF. Because
2560 * vmtruncate() writes the inode size before removing pages, once we have the
2561 * page lock we can determine safely if the page is beyond EOF. If it is not
2562 * beyond EOF, then the page is guaranteed safe against truncation until we
2563 * unlock the page.
2564 */
2565int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2566{
6da6abae 2567 struct inode *inode = fdentry(vma->vm_file)->d_inode;
1832a6d5 2568 struct btrfs_root *root = BTRFS_I(inode)->root;
9ebefb18
CM		 2569 unsigned long end;
2570 loff_t size;
1832a6d5 2571 int ret;
a52d9a80 2572 u64 page_start;
9ebefb18 2573
1832a6d5
CM		 2574 mutex_lock(&root->fs_info->fs_mutex);
2575 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
8f662a76 2576 mutex_unlock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2577 if (ret)
2578 goto out;
2579
2580 ret = -EINVAL;
2581
9ebefb18
CM		 2582 lock_page(page);
2583 wait_on_page_writeback(page);
9ebefb18 2584 size = i_size_read(inode);
35ebb934 2585 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 2586
9ebefb18 2587 if ((page->mapping != inode->i_mapping) ||
a52d9a80 2588 (page_start > size)) {
9ebefb18
CM		 2589 /* page got truncated out from underneath us */
2590 goto out_unlock;
2591 }
2592
2593 /* page is wholly or partially inside EOF */
a52d9a80 2594 if (page_start + PAGE_CACHE_SIZE > size)
9ebefb18
CM		 2595 end = size & ~PAGE_CACHE_MASK;
2596 else
2597 end = PAGE_CACHE_SIZE;
2598
b888db2b 2599 ret = btrfs_cow_one_page(inode, page, end);
9ebefb18
CM		 2600
2601out_unlock:
2602 unlock_page(page);
1832a6d5 2603out:
9ebefb18
CM		 2604 return ret;
2605}
2606
39279cc3
CM		 2607static void btrfs_truncate(struct inode *inode)
2608{
2609 struct btrfs_root *root = BTRFS_I(inode)->root;
2610 int ret;
2611 struct btrfs_trans_handle *trans;
d3c2fdcf 2612 unsigned long nr;
39279cc3
CM		 2613
2614 if (!S_ISREG(inode->i_mode))
2615 return;
2616 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2617 return;
2618
2619 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2620
2621 mutex_lock(&root->fs_info->fs_mutex);
2622 trans = btrfs_start_transaction(root, 1);
2623 btrfs_set_trans_block_group(trans, inode);
2624
2625 /* FIXME, add redo link to tree so we don't leak on crash */
85e21bac
CM		 2626 ret = btrfs_truncate_in_trans(trans, root, inode,
2627 BTRFS_EXTENT_DATA_KEY);
39279cc3 2628 btrfs_update_inode(trans, root, inode);
d3c2fdcf 2629 nr = trans->blocks_used;
5f39d397 2630
39279cc3
CM		 2631 ret = btrfs_end_transaction(trans, root);
2632 BUG_ON(ret);
2633 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2634 btrfs_btree_balance_dirty(root, nr);
e2008b61 2635 btrfs_throttle(root);
39279cc3
CM		 2636}
2637
4313b399
CM		 2638static int noinline create_subvol(struct btrfs_root *root, char *name,
2639 int namelen)
39279cc3
CM		 2640{
2641 struct btrfs_trans_handle *trans;
2642 struct btrfs_key key;
2643 struct btrfs_root_item root_item;
2644 struct btrfs_inode_item *inode_item;
5f39d397 2645 struct extent_buffer *leaf;
dc17ff8f 2646 struct btrfs_root *new_root = root;
39279cc3
CM		 2647 struct inode *inode;
2648 struct inode *dir;
2649 int ret;
54aa1f4d 2650 int err;
39279cc3
CM		 2651 u64 objectid;
2652 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
d3c2fdcf 2653 unsigned long nr = 1;
39279cc3
CM		 2654
2655 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2656 ret = btrfs_check_free_space(root, 1, 0);
2657 if (ret)
2658 goto fail_commit;
2659
39279cc3
CM		 2660 trans = btrfs_start_transaction(root, 1);
2661 BUG_ON(!trans);
2662
7bb86316
CM		 2663 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2664 0, &objectid);
2665 if (ret)
2666 goto fail;
2667
2668 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2669 objectid, trans->transid, 0, 0,
2670 0, 0);
5f39d397
CM		 2671 if (IS_ERR(leaf))
2672 return PTR_ERR(leaf);
2673
2674 btrfs_set_header_nritems(leaf, 0);
2675 btrfs_set_header_level(leaf, 0);
db94535d 2676 btrfs_set_header_bytenr(leaf, leaf->start);
5f39d397 2677 btrfs_set_header_generation(leaf, trans->transid);
7bb86316
CM		 2678 btrfs_set_header_owner(leaf, objectid);
2679
5f39d397
CM		 2680 write_extent_buffer(leaf, root->fs_info->fsid,
2681 (unsigned long)btrfs_header_fsid(leaf),
2682 BTRFS_FSID_SIZE);
2683 btrfs_mark_buffer_dirty(leaf);
39279cc3
CM		 2684
2685 inode_item = &root_item.inode;
2686 memset(inode_item, 0, sizeof(*inode_item));
5f39d397
CM		 2687 inode_item->generation = cpu_to_le64(1);
2688 inode_item->size = cpu_to_le64(3);
2689 inode_item->nlink = cpu_to_le32(1);
2690 inode_item->nblocks = cpu_to_le64(1);
2691 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
39279cc3 2692
db94535d
CM		 2693 btrfs_set_root_bytenr(&root_item, leaf->start);
2694 btrfs_set_root_level(&root_item, 0);
39279cc3 2695 btrfs_set_root_refs(&root_item, 1);
5f39d397
CM		 2696 btrfs_set_root_used(&root_item, 0);
2697
5eda7b5e
CM		 2698 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2699 root_item.drop_level = 0;
5f39d397
CM		 2700
2701 free_extent_buffer(leaf);
2702 leaf = NULL;
39279cc3 2703
39279cc3
CM		 2704 btrfs_set_root_dirid(&root_item, new_dirid);
2705
2706 key.objectid = objectid;
2707 key.offset = 1;
39279cc3
CM		 2708 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2709 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2710 &root_item);
54aa1f4d
CM		 2711 if (ret)
2712 goto fail;
39279cc3
CM		 2713
2714 /*
2715 * insert the directory item
2716 */
2717 key.offset = (u64)-1;
2718 dir = root->fs_info->sb->s_root->d_inode;
2719 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2720 name, namelen, dir->i_ino, &key,
2721 BTRFS_FT_DIR);
54aa1f4d
CM		 2722 if (ret)
2723 goto fail;
39279cc3 2724
3954401f
CM		 2725 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2726 name, namelen, objectid,
2727 root->fs_info->sb->s_root->d_inode->i_ino);
2728 if (ret)
2729 goto fail;
2730
39279cc3 2731 ret = btrfs_commit_transaction(trans, root);
54aa1f4d
CM		 2732 if (ret)
2733 goto fail_commit;
39279cc3 2734
58176a96 2735 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
39279cc3
CM		 2736 BUG_ON(!new_root);
2737
2738 trans = btrfs_start_transaction(new_root, 1);
2739 BUG_ON(!trans);
2740
9c58309d
CM		 2741 inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid,
2742 new_dirid,
39279cc3 2743 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
54aa1f4d
CM		 2744 if (IS_ERR(inode))
2745 goto fail;
39279cc3
CM		 2746 inode->i_op = &btrfs_dir_inode_operations;
2747 inode->i_fop = &btrfs_dir_file_operations;
34088780 2748 new_root->inode = inode;
39279cc3 2749
3954401f
CM		 2750 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2751 new_dirid);
39279cc3 2752 inode->i_nlink = 1;
3954401f 2753 inode->i_size = 0;
39279cc3 2754 ret = btrfs_update_inode(trans, new_root, inode);
54aa1f4d
CM		 2755 if (ret)
2756 goto fail;
2757fail:
d3c2fdcf 2758 nr = trans->blocks_used;
dc17ff8f 2759 err = btrfs_commit_transaction(trans, new_root);
54aa1f4d
CM		 2760 if (err && !ret)
2761 ret = err;
2762fail_commit:
39279cc3 2763 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2764 btrfs_btree_balance_dirty(root, nr);
e2008b61 2765 btrfs_throttle(root);
54aa1f4d 2766 return ret;
39279cc3
CM		 2767}
2768
2769static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2770{
3063d29f 2771 struct btrfs_pending_snapshot *pending_snapshot;
39279cc3 2772 struct btrfs_trans_handle *trans;
39279cc3 2773 int ret;
54aa1f4d 2774 int err;
1832a6d5 2775 unsigned long nr = 0;
39279cc3
CM		 2776
2777 if (!root->ref_cows)
2778 return -EINVAL;
2779
2780 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2781 ret = btrfs_check_free_space(root, 1, 0);
2782 if (ret)
2783 goto fail_unlock;
2784
3063d29f
CM		 2785 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
2786 if (!pending_snapshot) {
2787 ret = -ENOMEM;
2788 goto fail_unlock;
2789 }
fb4bc1e0 2790 pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
3063d29f
CM		 2791 if (!pending_snapshot->name) {
2792 ret = -ENOMEM;
2793 kfree(pending_snapshot);
2794 goto fail_unlock;
2795 }
fb4bc1e0
Y		 2796 memcpy(pending_snapshot->name, name, namelen);
2797 pending_snapshot->name[namelen] = '\0';
39279cc3
CM		 2798 trans = btrfs_start_transaction(root, 1);
2799 BUG_ON(!trans);
3063d29f
CM		 2800 pending_snapshot->root = root;
2801 list_add(&pending_snapshot->list,
2802 &trans->transaction->pending_snapshots);
39279cc3 2803 ret = btrfs_update_inode(trans, root, root->inode);
54aa1f4d 2804 err = btrfs_commit_transaction(trans, root);
5f39d397 2805
1832a6d5 2806fail_unlock:
39279cc3 2807 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2808 btrfs_btree_balance_dirty(root, nr);
e2008b61 2809 btrfs_throttle(root);
54aa1f4d 2810 return ret;
39279cc3
CM		 2811}
2812
edbd8d4e 2813unsigned long btrfs_force_ra(struct address_space *mapping,
86479a04
CM		 2814 struct file_ra_state *ra, struct file *file,
2815 pgoff_t offset, pgoff_t last_index)
2816{
8e7bf94f 2817 pgoff_t req_size = last_index - offset + 1;
86479a04
CM		 2818
2819#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
86479a04
CM		 2820 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2821 return offset;
2822#else
86479a04
CM		 2823 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2824 return offset + req_size;
2825#endif
2826}
2827
2828int btrfs_defrag_file(struct file *file) {
6da6abae 2829 struct inode *inode = fdentry(file)->d_inode;
1832a6d5 2830 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 2831 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
86479a04
CM		 2832 struct page *page;
2833 unsigned long last_index;
8e7bf94f
CM		 2834 unsigned long ra_pages = root->fs_info->bdi.ra_pages;
2835 unsigned long total_read = 0;
86479a04
CM		 2836 u64 page_start;
2837 u64 page_end;
2838 unsigned long i;
1832a6d5
CM		 2839 int ret;
2840
2841 mutex_lock(&root->fs_info->fs_mutex);
2842 ret = btrfs_check_free_space(root, inode->i_size, 0);
2843 mutex_unlock(&root->fs_info->fs_mutex);
2844 if (ret)
2845 return -ENOSPC;
86479a04
CM		 2846
2847 mutex_lock(&inode->i_mutex);
2848 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2849 for (i = 0; i <= last_index; i++) {
8e7bf94f
CM		 2850 if (total_read % ra_pages == 0) {
2851 btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i,
2852 min(last_index, i + ra_pages - 1));
86479a04 2853 }
8e7bf94f 2854 total_read++;
86479a04
CM		 2855 page = grab_cache_page(inode->i_mapping, i);
2856 if (!page)
2857 goto out_unlock;
2858 if (!PageUptodate(page)) {
2859 btrfs_readpage(NULL, page);
2860 lock_page(page);
2861 if (!PageUptodate(page)) {
2862 unlock_page(page);
2863 page_cache_release(page);
2864 goto out_unlock;
2865 }
2866 }
35ebb934 2867 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
86479a04
CM		 2868 page_end = page_start + PAGE_CACHE_SIZE - 1;
2869
d1310b2e 2870 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
d1310b2e 2871 set_extent_delalloc(io_tree, page_start,
86479a04 2872 page_end, GFP_NOFS);
edbd8d4e 2873
d1310b2e 2874 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
86479a04
CM		 2875 set_page_dirty(page);
2876 unlock_page(page);
2877 page_cache_release(page);
2878 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2879 }
2880
2881out_unlock:
2882 mutex_unlock(&inode->i_mutex);
2883 return 0;
2884}
2885
edbd8d4e
CM		 2886static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2887{
2888 u64 new_size;
2889 u64 old_size;
8f18cf13 2890 u64 devid = 1;
edbd8d4e
CM		 2891 struct btrfs_ioctl_vol_args *vol_args;
2892 struct btrfs_trans_handle *trans;
8f18cf13 2893 struct btrfs_device *device = NULL;
edbd8d4e 2894 char *sizestr;
8f18cf13 2895 char *devstr = NULL;
edbd8d4e
CM		 2896 int ret = 0;
2897 int namelen;
2898 int mod = 0;
2899
2900 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2901
2902 if (!vol_args)
2903 return -ENOMEM;
2904
2905 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2906 ret = -EFAULT;
2907 goto out;
2908 }
2909 namelen = strlen(vol_args->name);
2910 if (namelen > BTRFS_VOL_NAME_MAX) {
2911 ret = -EINVAL;
2912 goto out;
2913 }
2914
8f18cf13 2915 mutex_lock(&root->fs_info->fs_mutex);
edbd8d4e 2916 sizestr = vol_args->name;
8f18cf13
CM		 2917 devstr = strchr(sizestr, ':');
2918 if (devstr) {
2919 char *end;
2920 sizestr = devstr + 1;
2921 *devstr = '\0';
2922 devstr = vol_args->name;
2923 devid = simple_strtoull(devstr, &end, 10);
2924printk("resizing devid %Lu\n", devid);
2925 }
2926 device = btrfs_find_device(root, devid, NULL);
2927 if (!device) {
2928 printk("resizer unable to find device %Lu\n", devid);
2929 ret = -EINVAL;
2930 goto out_unlock;
2931 }
edbd8d4e 2932 if (!strcmp(sizestr, "max"))
8f18cf13 2933 new_size = device->bdev->bd_inode->i_size;
edbd8d4e
CM		 2934 else {
2935 if (sizestr[0] == '-') {
2936 mod = -1;
2937 sizestr++;
2938 } else if (sizestr[0] == '+') {
2939 mod = 1;
2940 sizestr++;
2941 }
2942 new_size = btrfs_parse_size(sizestr);
2943 if (new_size == 0) {
2944 ret = -EINVAL;
8f18cf13 2945 goto out_unlock;
edbd8d4e
CM		 2946 }
2947 }
2948
8f18cf13 2949 old_size = device->total_bytes;
edbd8d4e
CM		 2950
2951 if (mod < 0) {
2952 if (new_size > old_size) {
2953 ret = -EINVAL;
2954 goto out_unlock;
2955 }
2956 new_size = old_size - new_size;
2957 } else if (mod > 0) {
2958 new_size = old_size + new_size;
2959 }
2960
2961 if (new_size < 256 * 1024 * 1024) {
2962 ret = -EINVAL;
2963 goto out_unlock;
2964 }
8f18cf13 2965 if (new_size > device->bdev->bd_inode->i_size) {
edbd8d4e
CM		 2966 ret = -EFBIG;
2967 goto out_unlock;
2968 }
f9ef6604
CM		 2969
2970 do_div(new_size, root->sectorsize);
2971 new_size *= root->sectorsize;
edbd8d4e 2972
8f18cf13
CM		 2973printk("new size for %s is %llu\n", device->name, (unsigned long long)new_size);
2974
edbd8d4e
CM		 2975 if (new_size > old_size) {
2976 trans = btrfs_start_transaction(root, 1);
8f18cf13 2977 ret = btrfs_grow_device(trans, device, new_size);
edbd8d4e
CM		 2978 btrfs_commit_transaction(trans, root);
2979 } else {
8f18cf13 2980 ret = btrfs_shrink_device(device, new_size);
edbd8d4e
CM		 2981 }
2982
2983out_unlock:
2984 mutex_unlock(&root->fs_info->fs_mutex);
2985out:
2986 kfree(vol_args);
2987 return ret;
2988}
2989
4313b399
CM		 2990static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
2991 void __user *arg)
39279cc3 2992{
4aec2b52 2993 struct btrfs_ioctl_vol_args *vol_args;
39279cc3 2994 struct btrfs_dir_item *di;
39279cc3
CM		 2995 struct btrfs_path *path;
2996 u64 root_dirid;
4aec2b52
CM		 2997 int namelen;
2998 int ret;
39279cc3 2999
4aec2b52 3000 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
5f39d397 3001
4aec2b52
CM		 3002 if (!vol_args)
3003 return -ENOMEM;
3004
3005 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
3006 ret = -EFAULT;
3007 goto out;
3008 }
3009
3010 namelen = strlen(vol_args->name);
3011 if (namelen > BTRFS_VOL_NAME_MAX) {
3012 ret = -EINVAL;
3013 goto out;
3014 }
3015 if (strchr(vol_args->name, '/')) {
3016 ret = -EINVAL;
3017 goto out;
3018 }
d03581f4
CH		 3019
3020 path = btrfs_alloc_path();
4aec2b52
CM		 3021 if (!path) {
3022 ret = -ENOMEM;
3023 goto out;
3024 }
d03581f4
CH		 3025
3026 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
3027 mutex_lock(&root->fs_info->fs_mutex);
3028 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
3029 path, root_dirid,
4aec2b52 3030 vol_args->name, namelen, 0);
d03581f4
CH		 3031 mutex_unlock(&root->fs_info->fs_mutex);
3032 btrfs_free_path(path);
4aec2b52
CM		 3033
3034 if (di && !IS_ERR(di)) {
3035 ret = -EEXIST;
3036 goto out;
3037 }
3038
3039 if (IS_ERR(di)) {
3040 ret = PTR_ERR(di);
3041 goto out;
3042 }
d03581f4
CH		 3043
3044 if (root == root->fs_info->tree_root)
4aec2b52
CM		 3045 ret = create_subvol(root, vol_args->name, namelen);
3046 else
3047 ret = create_snapshot(root, vol_args->name, namelen);
3048out:
3049 kfree(vol_args);
3050 return ret;
d03581f4
CH		 3051}
3052
3053static int btrfs_ioctl_defrag(struct file *file)
3054{
6da6abae 3055 struct inode *inode = fdentry(file)->d_inode;
d03581f4
CH		 3056 struct btrfs_root *root = BTRFS_I(inode)->root;
3057
3058 switch (inode->i_mode & S_IFMT) {
3059 case S_IFDIR:
39279cc3 3060 mutex_lock(&root->fs_info->fs_mutex);
d03581f4
CH		 3061 btrfs_defrag_root(root, 0);
3062 btrfs_defrag_root(root->fs_info->extent_root, 0);
39279cc3 3063 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3 3064 break;
d03581f4
CH		 3065 case S_IFREG:
3066 btrfs_defrag_file(file);
3067 break;
3068 }
3069
3070 return 0;
3071}
6702ed49 3072
788f20eb
CM		 3073long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
3074{
3075 struct btrfs_ioctl_vol_args *vol_args;
3076 int ret;
3077
3078 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
3079
3080 if (!vol_args)
3081 return -ENOMEM;
3082
3083 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
3084 ret = -EFAULT;
3085 goto out;
3086 }
3087 ret = btrfs_init_new_device(root, vol_args->name);
3088
3089out:
3090 kfree(vol_args);
3091 return ret;
3092}
3093
d03581f4
CH		 3094long btrfs_ioctl(struct file *file, unsigned int
3095 cmd, unsigned long arg)
3096{
6da6abae 3097 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
d03581f4
CH		 3098
3099 switch (cmd) {
3100 case BTRFS_IOC_SNAP_CREATE:
3101 return btrfs_ioctl_snap_create(root, (void __user *)arg);
6702ed49 3102 case BTRFS_IOC_DEFRAG:
d03581f4 3103 return btrfs_ioctl_defrag(file);
edbd8d4e
CM		 3104 case BTRFS_IOC_RESIZE:
3105 return btrfs_ioctl_resize(root, (void __user *)arg);
788f20eb
CM		 3106 case BTRFS_IOC_ADD_DEV:
3107 return btrfs_ioctl_add_dev(root, (void __user *)arg);
39279cc3 3108 }
d03581f4
CH		 3109
3110 return -ENOTTY;
39279cc3
CM		 3111}
3112
39279cc3
CM		 3113/*
3114 * Called inside transaction, so use GFP_NOFS
3115 */
3116struct inode *btrfs_alloc_inode(struct super_block *sb)
3117{
3118 struct btrfs_inode *ei;
3119
3120 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
3121 if (!ei)
3122 return NULL;
15ee9bc7 3123 ei->last_trans = 0;
dc17ff8f 3124 ei->ordered_trans = 0;
39279cc3
CM		 3125 return &ei->vfs_inode;
3126}
3127
3128void btrfs_destroy_inode(struct inode *inode)
3129{
3130 WARN_ON(!list_empty(&inode->i_dentry));
3131 WARN_ON(inode->i_data.nrpages);
3132
8c416c9e 3133 btrfs_drop_extent_cache(inode, 0, (u64)-1);
39279cc3
CM		 3134 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
3135}
3136
44ec0b71
CM		 3137#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
3138static void init_once(struct kmem_cache * cachep, void *foo)
3139#else
39279cc3
CM		 3140static void init_once(void * foo, struct kmem_cache * cachep,
3141 unsigned long flags)
44ec0b71 3142#endif
39279cc3
CM		 3143{
3144 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
3145
3146 inode_init_once(&ei->vfs_inode);
3147}
3148
3149void btrfs_destroy_cachep(void)
3150{
3151 if (btrfs_inode_cachep)
3152 kmem_cache_destroy(btrfs_inode_cachep);
3153 if (btrfs_trans_handle_cachep)
3154 kmem_cache_destroy(btrfs_trans_handle_cachep);
3155 if (btrfs_transaction_cachep)
3156 kmem_cache_destroy(btrfs_transaction_cachep);
3157 if (btrfs_bit_radix_cachep)
3158 kmem_cache_destroy(btrfs_bit_radix_cachep);
3159 if (btrfs_path_cachep)
3160 kmem_cache_destroy(btrfs_path_cachep);
3161}
3162
86479a04 3163struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
92fee66d 3164 unsigned long extra_flags,
44ec0b71
CM		 3165#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
3166 void (*ctor)(struct kmem_cache *, void *)
3167#else
92fee66d 3168 void (*ctor)(void *, struct kmem_cache *,
44ec0b71
CM		 3169 unsigned long)
3170#endif
3171 )
92fee66d
CM		 3172{
3173 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
3174 SLAB_MEM_SPREAD | extra_flags), ctor
3175#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
3176 ,NULL
3177#endif
3178 );
3179}
3180
39279cc3
CM		 3181int btrfs_init_cachep(void)
3182{
86479a04 3183 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
92fee66d
CM		 3184 sizeof(struct btrfs_inode),
3185 0, init_once);
39279cc3
CM		 3186 if (!btrfs_inode_cachep)
3187 goto fail;
86479a04
CM		 3188 btrfs_trans_handle_cachep =
3189 btrfs_cache_create("btrfs_trans_handle_cache",
3190 sizeof(struct btrfs_trans_handle),
3191 0, NULL);
39279cc3
CM		 3192 if (!btrfs_trans_handle_cachep)
3193 goto fail;
86479a04 3194 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
39279cc3 3195 sizeof(struct btrfs_transaction),
92fee66d 3196 0, NULL);
39279cc3
CM		 3197 if (!btrfs_transaction_cachep)
3198 goto fail;
86479a04 3199 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
23223584 3200 sizeof(struct btrfs_path),
92fee66d 3201 0, NULL);
39279cc3
CM		 3202 if (!btrfs_path_cachep)
3203 goto fail;
86479a04 3204 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
92fee66d 3205 SLAB_DESTROY_BY_RCU, NULL);
39279cc3
CM		 3206 if (!btrfs_bit_radix_cachep)
3207 goto fail;
3208 return 0;
3209fail:
3210 btrfs_destroy_cachep();
3211 return -ENOMEM;
3212}
3213
3214static int btrfs_getattr(struct vfsmount *mnt,
3215 struct dentry *dentry, struct kstat *stat)
3216{
3217 struct inode *inode = dentry->d_inode;
3218 generic_fillattr(inode, stat);
d6667462 3219 stat->blksize = PAGE_CACHE_SIZE;
9069218d 3220 stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9);
39279cc3
CM		 3221 return 0;
3222}
3223
3224static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
3225 struct inode * new_dir,struct dentry *new_dentry)
3226{
3227 struct btrfs_trans_handle *trans;
3228 struct btrfs_root *root = BTRFS_I(old_dir)->root;
3229 struct inode *new_inode = new_dentry->d_inode;
3230 struct inode *old_inode = old_dentry->d_inode;
3231 struct timespec ctime = CURRENT_TIME;
3232 struct btrfs_path *path;
39279cc3
CM		 3233 int ret;
3234
3235 if (S_ISDIR(old_inode->i_mode) && new_inode &&
3236 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
3237 return -ENOTEMPTY;
3238 }
5f39d397 3239
39279cc3 3240 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 3241 ret = btrfs_check_free_space(root, 1, 0);
3242 if (ret)
3243 goto out_unlock;
3244
39279cc3 3245 trans = btrfs_start_transaction(root, 1);
5f39d397 3246
39279cc3
CM		 3247 btrfs_set_trans_block_group(trans, new_dir);
3248 path = btrfs_alloc_path();
3249 if (!path) {
3250 ret = -ENOMEM;
3251 goto out_fail;
3252 }
3253
3254 old_dentry->d_inode->i_nlink++;
3255 old_dir->i_ctime = old_dir->i_mtime = ctime;
3256 new_dir->i_ctime = new_dir->i_mtime = ctime;
3257 old_inode->i_ctime = ctime;
5f39d397 3258
39279cc3
CM		 3259 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
3260 if (ret)
3261 goto out_fail;
3262
3263 if (new_inode) {
3264 new_inode->i_ctime = CURRENT_TIME;
3265 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
3266 if (ret)
3267 goto out_fail;
39279cc3 3268 }
9c58309d 3269 ret = btrfs_add_link(trans, new_dentry, old_inode, 1);
39279cc3
CM		 3270 if (ret)
3271 goto out_fail;
3272
3273out_fail:
3274 btrfs_free_path(path);
3275 btrfs_end_transaction(trans, root);
1832a6d5 3276out_unlock:
39279cc3
CM		 3277 mutex_unlock(&root->fs_info->fs_mutex);
3278 return ret;
3279}
3280
3281static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
3282 const char *symname)
3283{
3284 struct btrfs_trans_handle *trans;
3285 struct btrfs_root *root = BTRFS_I(dir)->root;
3286 struct btrfs_path *path;
3287 struct btrfs_key key;
1832a6d5 3288 struct inode *inode = NULL;
39279cc3
CM		 3289 int err;
3290 int drop_inode = 0;
3291 u64 objectid;
3292 int name_len;
3293 int datasize;
5f39d397 3294 unsigned long ptr;
39279cc3 3295 struct btrfs_file_extent_item *ei;
5f39d397 3296 struct extent_buffer *leaf;
1832a6d5 3297 unsigned long nr = 0;
39279cc3
CM		 3298
3299 name_len = strlen(symname) + 1;
3300 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
3301 return -ENAMETOOLONG;
1832a6d5 3302
39279cc3 3303 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 3304 err = btrfs_check_free_space(root, 1, 0);
3305 if (err)
3306 goto out_fail;
3307
39279cc3
CM		 3308 trans = btrfs_start_transaction(root, 1);
3309 btrfs_set_trans_block_group(trans, dir);
3310
3311 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
3312 if (err) {
3313 err = -ENOSPC;
3314 goto out_unlock;
3315 }
3316
9c58309d
CM		 3317 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
3318 dentry->d_name.len,
3319 dentry->d_parent->d_inode->i_ino, objectid,
39279cc3
CM		 3320 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
3321 err = PTR_ERR(inode);
3322 if (IS_ERR(inode))
3323 goto out_unlock;
3324
3325 btrfs_set_trans_block_group(trans, inode);
9c58309d 3326 err = btrfs_add_nondir(trans, dentry, inode, 0);
39279cc3
CM		 3327 if (err)
3328 drop_inode = 1;
3329 else {
3330 inode->i_mapping->a_ops = &btrfs_aops;
04160088 3331 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3
CM		 3332 inode->i_fop = &btrfs_file_operations;
3333 inode->i_op = &btrfs_file_inode_operations;
d1310b2e
CM		 3334 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
3335 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
a52d9a80 3336 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 3337 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
3338 inode->i_mapping, GFP_NOFS);
9069218d 3339 BTRFS_I(inode)->delalloc_bytes = 0;
81d7ed29 3340 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
d1310b2e 3341 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 3342 }
3343 dir->i_sb->s_dirt = 1;
3344 btrfs_update_inode_block_group(trans, inode);
3345 btrfs_update_inode_block_group(trans, dir);
3346 if (drop_inode)
3347 goto out_unlock;
3348
3349 path = btrfs_alloc_path();
3350 BUG_ON(!path);
3351 key.objectid = inode->i_ino;
3352 key.offset = 0;
39279cc3
CM		 3353 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
3354 datasize = btrfs_file_extent_calc_inline_size(name_len);
3355 err = btrfs_insert_empty_item(trans, root, path, &key,
3356 datasize);
54aa1f4d
CM		 3357 if (err) {
3358 drop_inode = 1;
3359 goto out_unlock;
3360 }
5f39d397
CM		 3361 leaf = path->nodes[0];
3362 ei = btrfs_item_ptr(leaf, path->slots[0],
3363 struct btrfs_file_extent_item);
3364 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
3365 btrfs_set_file_extent_type(leaf, ei,
39279cc3
CM		 3366 BTRFS_FILE_EXTENT_INLINE);
3367 ptr = btrfs_file_extent_inline_start(ei);
5f39d397
CM		 3368 write_extent_buffer(leaf, symname, ptr, name_len);
3369 btrfs_mark_buffer_dirty(leaf);
39279cc3 3370 btrfs_free_path(path);
5f39d397 3371
39279cc3
CM		 3372 inode->i_op = &btrfs_symlink_inode_operations;
3373 inode->i_mapping->a_ops = &btrfs_symlink_aops;
04160088 3374 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3 3375 inode->i_size = name_len - 1;
54aa1f4d
CM		 3376 err = btrfs_update_inode(trans, root, inode);
3377 if (err)
3378 drop_inode = 1;
39279cc3
CM		 3379
3380out_unlock:
d3c2fdcf 3381 nr = trans->blocks_used;
39279cc3 3382 btrfs_end_transaction(trans, root);
1832a6d5 3383out_fail:
39279cc3 3384 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 3385 if (drop_inode) {
3386 inode_dec_link_count(inode);
3387 iput(inode);
3388 }
d3c2fdcf 3389 btrfs_btree_balance_dirty(root, nr);
e2008b61 3390 btrfs_throttle(root);
39279cc3
CM		 3391 return err;
3392}
16432985 3393
fdebe2bd
Y		 3394static int btrfs_permission(struct inode *inode, int mask,
3395 struct nameidata *nd)
3396{
3397 if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
3398 return -EACCES;
3399 return generic_permission(inode, mask, NULL);
3400}
39279cc3
CM		 3401
3402static struct inode_operations btrfs_dir_inode_operations = {
3403 .lookup = btrfs_lookup,
3404 .create = btrfs_create,
3405 .unlink = btrfs_unlink,
3406 .link = btrfs_link,
3407 .mkdir = btrfs_mkdir,
3408 .rmdir = btrfs_rmdir,
3409 .rename = btrfs_rename,
3410 .symlink = btrfs_symlink,
3411 .setattr = btrfs_setattr,
618e21d5 3412 .mknod = btrfs_mknod,
5103e947
JB		 3413 .setxattr = generic_setxattr,
3414 .getxattr = generic_getxattr,
3415 .listxattr = btrfs_listxattr,
3416 .removexattr = generic_removexattr,
fdebe2bd 3417 .permission = btrfs_permission,
39279cc3 3418};
39279cc3
CM		 3419static struct inode_operations btrfs_dir_ro_inode_operations = {
3420 .lookup = btrfs_lookup,
fdebe2bd 3421 .permission = btrfs_permission,
39279cc3 3422};
39279cc3
CM		 3423static struct file_operations btrfs_dir_file_operations = {
3424 .llseek = generic_file_llseek,
3425 .read = generic_read_dir,
3426 .readdir = btrfs_readdir,
34287aa3 3427 .unlocked_ioctl = btrfs_ioctl,
39279cc3 3428#ifdef CONFIG_COMPAT
34287aa3 3429 .compat_ioctl = btrfs_ioctl,
39279cc3
CM		 3430#endif
3431};
3432
d1310b2e 3433static struct extent_io_ops btrfs_extent_io_ops = {
07157aac 3434 .fill_delalloc = run_delalloc_range,
065631f6 3435 .submit_bio_hook = btrfs_submit_bio_hook,
239b14b3 3436 .merge_bio_hook = btrfs_merge_bio_hook,
07157aac
CM		 3437 .readpage_io_hook = btrfs_readpage_io_hook,
3438 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
7e38326f 3439 .readpage_io_failed_hook = btrfs_readpage_io_failed_hook,
b0c68f8b
CM		 3440 .set_bit_hook = btrfs_set_bit_hook,
3441 .clear_bit_hook = btrfs_clear_bit_hook,
07157aac
CM		 3442};
3443
39279cc3
CM		 3444static struct address_space_operations btrfs_aops = {
3445 .readpage = btrfs_readpage,
3446 .writepage = btrfs_writepage,
b293f02e 3447 .writepages = btrfs_writepages,
3ab2fb5a 3448 .readpages = btrfs_readpages,
39279cc3 3449 .sync_page = block_sync_page,
39279cc3 3450 .bmap = btrfs_bmap,
16432985 3451 .direct_IO = btrfs_direct_IO,
a52d9a80
CM		 3452 .invalidatepage = btrfs_invalidatepage,
3453 .releasepage = btrfs_releasepage,
3454 .set_page_dirty = __set_page_dirty_nobuffers,
39279cc3
CM		 3455};
3456
3457static struct address_space_operations btrfs_symlink_aops = {
3458 .readpage = btrfs_readpage,
3459 .writepage = btrfs_writepage,
2bf5a725
CM		 3460 .invalidatepage = btrfs_invalidatepage,
3461 .releasepage = btrfs_releasepage,
39279cc3
CM		 3462};
3463
3464static struct inode_operations btrfs_file_inode_operations = {
3465 .truncate = btrfs_truncate,
3466 .getattr = btrfs_getattr,
3467 .setattr = btrfs_setattr,
5103e947
JB		 3468 .setxattr = generic_setxattr,
3469 .getxattr = generic_getxattr,
3470 .listxattr = btrfs_listxattr,
3471 .removexattr = generic_removexattr,
fdebe2bd 3472 .permission = btrfs_permission,
39279cc3 3473};
618e21d5
JB		 3474static struct inode_operations btrfs_special_inode_operations = {
3475 .getattr = btrfs_getattr,
3476 .setattr = btrfs_setattr,
fdebe2bd 3477 .permission = btrfs_permission,
618e21d5 3478};
39279cc3
CM		 3479static struct inode_operations btrfs_symlink_inode_operations = {
3480 .readlink = generic_readlink,
3481 .follow_link = page_follow_link_light,
3482 .put_link = page_put_link,
fdebe2bd 3483 .permission = btrfs_permission,
39279cc3 3484};
Linux 6.x block layer and io_uring tree(s)