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Btrfs: Add extra checks to avoid removing extent_state from pages we can't free
[net-next-2.6.git] / fs / btrfs / inode.c
CommitLineData
6cbd5570
CM		 1/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
065631f6 19#include <linux/bio.h>
39279cc3
CM		 20#include <linux/buffer_head.h>
21#include <linux/fs.h>
22#include <linux/pagemap.h>
23#include <linux/highmem.h>
24#include <linux/time.h>
25#include <linux/init.h>
26#include <linux/string.h>
27#include <linux/smp_lock.h>
28#include <linux/backing-dev.h>
29#include <linux/mpage.h>
30#include <linux/swap.h>
31#include <linux/writeback.h>
32#include <linux/statfs.h>
33#include <linux/compat.h>
9ebefb18 34#include <linux/bit_spinlock.h>
92fee66d 35#include <linux/version.h>
5103e947 36#include <linux/xattr.h>
39279cc3
CM		 37#include "ctree.h"
38#include "disk-io.h"
39#include "transaction.h"
40#include "btrfs_inode.h"
41#include "ioctl.h"
42#include "print-tree.h"
0b86a832 43#include "volumes.h"
39279cc3
CM		 44
45struct btrfs_iget_args {
46 u64 ino;
47 struct btrfs_root *root;
48};
49
50static struct inode_operations btrfs_dir_inode_operations;
51static struct inode_operations btrfs_symlink_inode_operations;
52static struct inode_operations btrfs_dir_ro_inode_operations;
618e21d5 53static struct inode_operations btrfs_special_inode_operations;
39279cc3
CM		 54static struct inode_operations btrfs_file_inode_operations;
55static struct address_space_operations btrfs_aops;
56static struct address_space_operations btrfs_symlink_aops;
57static struct file_operations btrfs_dir_file_operations;
d1310b2e 58static struct extent_io_ops btrfs_extent_io_ops;
39279cc3
CM		 59
60static struct kmem_cache *btrfs_inode_cachep;
61struct kmem_cache *btrfs_trans_handle_cachep;
62struct kmem_cache *btrfs_transaction_cachep;
63struct kmem_cache *btrfs_bit_radix_cachep;
64struct kmem_cache *btrfs_path_cachep;
65
66#define S_SHIFT 12
67static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
68 [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
69 [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
70 [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
71 [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
72 [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
73 [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
74 [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
75};
76
1832a6d5
CM		 77int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
78 int for_del)
79{
80 u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy);
81 u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy);
82 u64 thresh;
83 int ret = 0;
84
85 if (for_del)
f9ef6604 86 thresh = total * 90;
1832a6d5 87 else
f9ef6604
CM		 88 thresh = total * 85;
89
90 do_div(thresh, 100);
1832a6d5
CM		 91
92 spin_lock(&root->fs_info->delalloc_lock);
93 if (used + root->fs_info->delalloc_bytes + num_required > thresh)
94 ret = -ENOSPC;
95 spin_unlock(&root->fs_info->delalloc_lock);
96 return ret;
97}
98
be20aa9d 99static int cow_file_range(struct inode *inode, u64 start, u64 end)
b888db2b
CM		 100{
101 struct btrfs_root *root = BTRFS_I(inode)->root;
102 struct btrfs_trans_handle *trans;
b888db2b 103 u64 alloc_hint = 0;
db94535d 104 u64 num_bytes;
c59f8951 105 u64 cur_alloc_size;
db94535d 106 u64 blocksize = root->sectorsize;
d1310b2e
CM		 107 u64 orig_start = start;
108 u64 orig_num_bytes;
be20aa9d
CM		 109 struct btrfs_key ins;
110 int ret;
b888db2b 111
b888db2b 112 trans = btrfs_start_transaction(root, 1);
b888db2b 113 BUG_ON(!trans);
be20aa9d
CM		 114 btrfs_set_trans_block_group(trans, inode);
115
db94535d 116 num_bytes = (end - start + blocksize) & ~(blocksize - 1);
be20aa9d 117 num_bytes = max(blocksize, num_bytes);
b888db2b 118 ret = btrfs_drop_extents(trans, root, inode,
3326d1b0 119 start, start + num_bytes, start, &alloc_hint);
d1310b2e 120 orig_num_bytes = num_bytes;
db94535d 121
179e29e4
CM		 122 if (alloc_hint == EXTENT_MAP_INLINE)
123 goto out;
124
c59f8951
CM		 125 while(num_bytes > 0) {
126 cur_alloc_size = min(num_bytes, root->fs_info->max_extent);
127 ret = btrfs_alloc_extent(trans, root, cur_alloc_size,
128 root->root_key.objectid,
129 trans->transid,
130 inode->i_ino, start, 0,
131 alloc_hint, (u64)-1, &ins, 1);
132 if (ret) {
133 WARN_ON(1);
134 goto out;
135 }
136 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
137 start, ins.objectid, ins.offset,
138 ins.offset);
9069218d 139 inode->i_blocks += ins.offset >> 9;
5f56406a 140 btrfs_check_file(root, inode);
c59f8951
CM		 141 num_bytes -= cur_alloc_size;
142 alloc_hint = ins.objectid + ins.offset;
143 start += cur_alloc_size;
b888db2b 144 }
d1310b2e
CM		 145 btrfs_drop_extent_cache(inode, orig_start,
146 orig_start + orig_num_bytes - 1);
dc17ff8f 147 btrfs_add_ordered_inode(inode);
9069218d 148 btrfs_update_inode(trans, root, inode);
b888db2b
CM		 149out:
150 btrfs_end_transaction(trans, root);
be20aa9d
CM		 151 return ret;
152}
153
154static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end)
155{
156 u64 extent_start;
157 u64 extent_end;
158 u64 bytenr;
159 u64 cow_end;
1832a6d5 160 u64 loops = 0;
c31f8830 161 u64 total_fs_bytes;
be20aa9d
CM		 162 struct btrfs_root *root = BTRFS_I(inode)->root;
163 struct extent_buffer *leaf;
164 int found_type;
165 struct btrfs_path *path;
166 struct btrfs_file_extent_item *item;
167 int ret;
168 int err;
169 struct btrfs_key found_key;
170
c31f8830 171 total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
be20aa9d
CM		 172 path = btrfs_alloc_path();
173 BUG_ON(!path);
174again:
175 ret = btrfs_lookup_file_extent(NULL, root, path,
176 inode->i_ino, start, 0);
177 if (ret < 0) {
178 btrfs_free_path(path);
179 return ret;
180 }
181
182 cow_end = end;
183 if (ret != 0) {
184 if (path->slots[0] == 0)
185 goto not_found;
186 path->slots[0]--;
187 }
188
189 leaf = path->nodes[0];
190 item = btrfs_item_ptr(leaf, path->slots[0],
191 struct btrfs_file_extent_item);
192
193 /* are we inside the extent that was found? */
194 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
195 found_type = btrfs_key_type(&found_key);
196 if (found_key.objectid != inode->i_ino ||
197 found_type != BTRFS_EXTENT_DATA_KEY) {
198 goto not_found;
199 }
200
201 found_type = btrfs_file_extent_type(leaf, item);
202 extent_start = found_key.offset;
203 if (found_type == BTRFS_FILE_EXTENT_REG) {
c31f8830
CM		 204 u64 extent_num_bytes;
205
206 extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item);
207 extent_end = extent_start + extent_num_bytes;
be20aa9d
CM		 208 err = 0;
209
1832a6d5
CM		 210 if (loops && start != extent_start)
211 goto not_found;
212
be20aa9d
CM		 213 if (start < extent_start || start >= extent_end)
214 goto not_found;
215
216 cow_end = min(end, extent_end - 1);
217 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
218 if (bytenr == 0)
219 goto not_found;
220
c31f8830
CM		 221 /*
222 * we may be called by the resizer, make sure we're inside
223 * the limits of the FS
224 */
225 if (bytenr + extent_num_bytes > total_fs_bytes)
226 goto not_found;
227
be20aa9d
CM		 228 if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) {
229 goto not_found;
230 }
231
232 start = extent_end;
bd09835d 233 } else {
be20aa9d
CM		 234 goto not_found;
235 }
236loop:
237 if (start > end) {
238 btrfs_free_path(path);
239 return 0;
240 }
241 btrfs_release_path(root, path);
1832a6d5 242 loops++;
be20aa9d
CM		 243 goto again;
244
245not_found:
246 cow_file_range(inode, start, cow_end);
247 start = cow_end + 1;
248 goto loop;
249}
250
251static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
252{
253 struct btrfs_root *root = BTRFS_I(inode)->root;
254 int ret;
be20aa9d 255 mutex_lock(&root->fs_info->fs_mutex);
b98b6767
Y		 256 if (btrfs_test_opt(root, NODATACOW) ||
257 btrfs_test_flag(inode, NODATACOW))
be20aa9d
CM		 258 ret = run_delalloc_nocow(inode, start, end);
259 else
260 ret = cow_file_range(inode, start, end);
1832a6d5 261
b888db2b
CM		 262 mutex_unlock(&root->fs_info->fs_mutex);
263 return ret;
264}
265
291d673e 266int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
b0c68f8b 267 unsigned long old, unsigned long bits)
291d673e 268{
b0c68f8b 269 if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
291d673e
CM		 270 struct btrfs_root *root = BTRFS_I(inode)->root;
271 spin_lock(&root->fs_info->delalloc_lock);
9069218d 272 BTRFS_I(inode)->delalloc_bytes += end - start + 1;
291d673e
CM		 273 root->fs_info->delalloc_bytes += end - start + 1;
274 spin_unlock(&root->fs_info->delalloc_lock);
275 }
276 return 0;
277}
278
279int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
b0c68f8b 280 unsigned long old, unsigned long bits)
291d673e 281{
b0c68f8b 282 if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
291d673e
CM		 283 struct btrfs_root *root = BTRFS_I(inode)->root;
284 spin_lock(&root->fs_info->delalloc_lock);
b0c68f8b
CM		 285 if (end - start + 1 > root->fs_info->delalloc_bytes) {
286 printk("warning: delalloc account %Lu %Lu\n",
287 end - start + 1, root->fs_info->delalloc_bytes);
288 root->fs_info->delalloc_bytes = 0;
9069218d 289 BTRFS_I(inode)->delalloc_bytes = 0;
b0c68f8b
CM		 290 } else {
291 root->fs_info->delalloc_bytes -= end - start + 1;
9069218d 292 BTRFS_I(inode)->delalloc_bytes -= end - start + 1;
b0c68f8b 293 }
291d673e
CM		 294 spin_unlock(&root->fs_info->delalloc_lock);
295 }
296 return 0;
297}
298
239b14b3
CM		 299int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
300 size_t size, struct bio *bio)
301{
302 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
303 struct btrfs_mapping_tree *map_tree;
239b14b3 304 u64 logical = bio->bi_sector << 9;
239b14b3
CM		 305 u64 length = 0;
306 u64 map_length;
307 struct bio_vec *bvec;
308 int i;
309 int ret;
310
311 bio_for_each_segment(bvec, bio, i) {
312 length += bvec->bv_len;
313 }
314 map_tree = &root->fs_info->mapping_tree;
315 map_length = length;
cea9e445 316 ret = btrfs_map_block(map_tree, READ, logical,
f188591e 317 &map_length, NULL, 0);
cea9e445 318
239b14b3 319 if (map_length < length + size) {
239b14b3
CM		 320 return 1;
321 }
322 return 0;
323}
324
f188591e
CM		 325int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
326 int mirror_num)
065631f6 327{
065631f6
CM		 328 struct btrfs_root *root = BTRFS_I(inode)->root;
329 struct btrfs_trans_handle *trans;
330 int ret = 0;
331
22c59948
CM		 332 if (!(rw & (1 << BIO_RW))) {
333 ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
334 BUG_ON(ret);
0b86a832
CM		 335 goto mapit;
336 }
065631f6
CM		 337
338 if (btrfs_test_opt(root, NODATASUM) ||
0b86a832
CM		 339 btrfs_test_flag(inode, NODATASUM)) {
340 goto mapit;
341 }
065631f6
CM		 342
343 mutex_lock(&root->fs_info->fs_mutex);
344 trans = btrfs_start_transaction(root, 1);
345 btrfs_set_trans_block_group(trans, inode);
346 btrfs_csum_file_blocks(trans, root, inode, bio);
347 ret = btrfs_end_transaction(trans, root);
348 BUG_ON(ret);
349 mutex_unlock(&root->fs_info->fs_mutex);
0b86a832 350mapit:
f188591e 351 return btrfs_map_bio(root, rw, bio, mirror_num);
065631f6 352}
6885f308 353
07157aac
CM		 354int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
355{
356 int ret = 0;
357 struct inode *inode = page->mapping->host;
358 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 359 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
07157aac
CM		 360 struct btrfs_csum_item *item;
361 struct btrfs_path *path = NULL;
ff79f819 362 u32 csum;
b98b6767
Y		 363 if (btrfs_test_opt(root, NODATASUM) ||
364 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 365 return 0;
07157aac
CM		 366 mutex_lock(&root->fs_info->fs_mutex);
367 path = btrfs_alloc_path();
368 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
369 if (IS_ERR(item)) {
370 ret = PTR_ERR(item);
371 /* a csum that isn't present is a preallocated region. */
372 if (ret == -ENOENT || ret == -EFBIG)
373 ret = 0;
ff79f819 374 csum = 0;
aadfeb6e 375 printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start);
07157aac
CM		 376 goto out;
377 }
ff79f819
CM		 378 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
379 BTRFS_CRC32_SIZE);
d1310b2e 380 set_state_private(io_tree, start, csum);
07157aac
CM		 381out:
382 if (path)
383 btrfs_free_path(path);
384 mutex_unlock(&root->fs_info->fs_mutex);
385 return ret;
386}
387
7e38326f
CM		 388struct io_failure_record {
389 struct page *page;
390 u64 start;
391 u64 len;
392 u64 logical;
393 int last_mirror;
394};
395
396int btrfs_readpage_io_failed_hook(struct bio *failed_bio,
397 struct page *page, u64 start, u64 end,
398 struct extent_state *state)
399{
400 struct io_failure_record *failrec = NULL;
401 u64 private;
402 struct extent_map *em;
403 struct inode *inode = page->mapping->host;
404 struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree;
405 struct bio *bio;
406 int num_copies;
407 int ret;
408 u64 logical;
409
410 ret = get_state_private(failure_tree, start, &private);
411 if (ret) {
412 size_t pg_offset = start - page_offset(page);
413 failrec = kmalloc(sizeof(*failrec), GFP_NOFS);
414 if (!failrec)
415 return -ENOMEM;
416 failrec->start = start;
417 failrec->len = end - start + 1;
418 failrec->last_mirror = 0;
419
420 em = btrfs_get_extent(inode, NULL, pg_offset, start,
421 failrec->len, 0);
422
423 if (!em || IS_ERR(em)) {
424 kfree(failrec);
425 return -EIO;
426 }
427 logical = start - em->start;
428 logical = em->block_start + logical;
429 failrec->logical = logical;
430 free_extent_map(em);
431 set_extent_bits(failure_tree, start, end, EXTENT_LOCKED |
432 EXTENT_DIRTY, GFP_NOFS);
433 set_state_private(failure_tree, start, (u64)failrec);
434 } else {
435 failrec = (struct io_failure_record *)private;
436 }
437 num_copies = btrfs_num_copies(
438 &BTRFS_I(inode)->root->fs_info->mapping_tree,
439 failrec->logical, failrec->len);
440 failrec->last_mirror++;
441 if (!state) {
442 spin_lock_irq(&BTRFS_I(inode)->io_tree.lock);
443 state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree,
444 failrec->start,
445 EXTENT_LOCKED);
446 if (state && state->start != failrec->start)
447 state = NULL;
448 spin_unlock_irq(&BTRFS_I(inode)->io_tree.lock);
449 }
450 if (!state || failrec->last_mirror > num_copies) {
451 set_state_private(failure_tree, failrec->start, 0);
452 clear_extent_bits(failure_tree, failrec->start,
453 failrec->start + failrec->len - 1,
454 EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS);
455 kfree(failrec);
456 return -EIO;
457 }
458 bio = bio_alloc(GFP_NOFS, 1);
459 bio->bi_private = state;
460 bio->bi_end_io = failed_bio->bi_end_io;
461 bio->bi_sector = failrec->logical >> 9;
462 bio->bi_bdev = failed_bio->bi_bdev;
463 bio_add_page(bio, page, failrec->len, start - page_offset(page));
464 btrfs_submit_bio_hook(inode, READ, bio, failrec->last_mirror);
465 return 0;
466}
467
70dec807
CM		 468int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
469 struct extent_state *state)
07157aac 470{
35ebb934 471 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
07157aac 472 struct inode *inode = page->mapping->host;
d1310b2e 473 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
07157aac 474 char *kaddr;
aadfeb6e 475 u64 private = ~(u32)0;
07157aac 476 int ret;
ff79f819
CM		 477 struct btrfs_root *root = BTRFS_I(inode)->root;
478 u32 csum = ~(u32)0;
bbf0d006 479 unsigned long flags;
d1310b2e 480
b98b6767
Y		 481 if (btrfs_test_opt(root, NODATASUM) ||
482 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 483 return 0;
c2e639f0 484 if (state && state->start == start) {
70dec807
CM		 485 private = state->private;
486 ret = 0;
487 } else {
488 ret = get_state_private(io_tree, start, &private);
489 }
bbf0d006 490 local_irq_save(flags);
07157aac
CM		 491 kaddr = kmap_atomic(page, KM_IRQ0);
492 if (ret) {
493 goto zeroit;
494 }
ff79f819
CM		 495 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
496 btrfs_csum_final(csum, (char *)&csum);
497 if (csum != private) {
07157aac
CM		 498 goto zeroit;
499 }
500 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 501 local_irq_restore(flags);
7e38326f
CM		 502
503 /* if the io failure tree for this inode is non-empty,
504 * check to see if we've recovered from a failed IO
505 */
506 private = 0;
507 if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private,
508 (u64)-1, 1, EXTENT_DIRTY)) {
509 u64 private_failure;
510 struct io_failure_record *failure;
511 ret = get_state_private(&BTRFS_I(inode)->io_failure_tree,
512 start, &private_failure);
513 if (ret == 0) {
514 failure = (struct io_failure_record *)private_failure;
515 set_state_private(&BTRFS_I(inode)->io_failure_tree,
516 failure->start, 0);
517 clear_extent_bits(&BTRFS_I(inode)->io_failure_tree,
518 failure->start,
519 failure->start + failure->len - 1,
520 EXTENT_DIRTY | EXTENT_LOCKED,
521 GFP_NOFS);
522 kfree(failure);
523 }
524 }
07157aac
CM		 525 return 0;
526
527zeroit:
aadfeb6e
CM		 528 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
529 page->mapping->host->i_ino, (unsigned long long)start, csum,
530 private);
db94535d
CM		 531 memset(kaddr + offset, 1, end - start + 1);
532 flush_dcache_page(page);
07157aac 533 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 534 local_irq_restore(flags);
7e38326f 535 return -EIO;
07157aac 536}
b888db2b 537
39279cc3
CM		 538void btrfs_read_locked_inode(struct inode *inode)
539{
540 struct btrfs_path *path;
5f39d397 541 struct extent_buffer *leaf;
39279cc3 542 struct btrfs_inode_item *inode_item;
0b86a832 543 struct btrfs_timespec *tspec;
39279cc3
CM		 544 struct btrfs_root *root = BTRFS_I(inode)->root;
545 struct btrfs_key location;
546 u64 alloc_group_block;
618e21d5 547 u32 rdev;
39279cc3
CM		 548 int ret;
549
550 path = btrfs_alloc_path();
551 BUG_ON(!path);
39279cc3 552 mutex_lock(&root->fs_info->fs_mutex);
39279cc3 553 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
dc17ff8f 554
39279cc3 555 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
5f39d397 556 if (ret)
39279cc3 557 goto make_bad;
39279cc3 558
5f39d397
CM		 559 leaf = path->nodes[0];
560 inode_item = btrfs_item_ptr(leaf, path->slots[0],
561 struct btrfs_inode_item);
562
563 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
564 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
565 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
566 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
567 inode->i_size = btrfs_inode_size(leaf, inode_item);
568
569 tspec = btrfs_inode_atime(inode_item);
570 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
571 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
572
573 tspec = btrfs_inode_mtime(inode_item);
574 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
575 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
576
577 tspec = btrfs_inode_ctime(inode_item);
578 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
579 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
580
581 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
582 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
618e21d5 583 inode->i_rdev = 0;
5f39d397
CM		 584 rdev = btrfs_inode_rdev(leaf, inode_item);
585
586 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
39279cc3
CM		 587 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
588 alloc_group_block);
b98b6767 589 BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
e52ec0eb
CM		 590 if (!BTRFS_I(inode)->block_group) {
591 BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
0b86a832
CM		 592 NULL, 0,
593 BTRFS_BLOCK_GROUP_METADATA, 0);
e52ec0eb 594 }
39279cc3
CM		 595 btrfs_free_path(path);
596 inode_item = NULL;
597
598 mutex_unlock(&root->fs_info->fs_mutex);
599
600 switch (inode->i_mode & S_IFMT) {
39279cc3
CM		 601 case S_IFREG:
602 inode->i_mapping->a_ops = &btrfs_aops;
04160088 603 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
d1310b2e 604 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 605 inode->i_fop = &btrfs_file_operations;
606 inode->i_op = &btrfs_file_inode_operations;
607 break;
608 case S_IFDIR:
609 inode->i_fop = &btrfs_dir_file_operations;
610 if (root == root->fs_info->tree_root)
611 inode->i_op = &btrfs_dir_ro_inode_operations;
612 else
613 inode->i_op = &btrfs_dir_inode_operations;
614 break;
615 case S_IFLNK:
616 inode->i_op = &btrfs_symlink_inode_operations;
617 inode->i_mapping->a_ops = &btrfs_symlink_aops;
04160088 618 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3 619 break;
618e21d5
JB		 620 default:
621 init_special_inode(inode, inode->i_mode, rdev);
622 break;
39279cc3
CM		 623 }
624 return;
625
626make_bad:
627 btrfs_release_path(root, path);
628 btrfs_free_path(path);
629 mutex_unlock(&root->fs_info->fs_mutex);
630 make_bad_inode(inode);
631}
632
5f39d397
CM		 633static void fill_inode_item(struct extent_buffer *leaf,
634 struct btrfs_inode_item *item,
39279cc3
CM		 635 struct inode *inode)
636{
5f39d397
CM		 637 btrfs_set_inode_uid(leaf, item, inode->i_uid);
638 btrfs_set_inode_gid(leaf, item, inode->i_gid);
639 btrfs_set_inode_size(leaf, item, inode->i_size);
640 btrfs_set_inode_mode(leaf, item, inode->i_mode);
641 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
642
643 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
644 inode->i_atime.tv_sec);
645 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
646 inode->i_atime.tv_nsec);
647
648 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
649 inode->i_mtime.tv_sec);
650 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
651 inode->i_mtime.tv_nsec);
652
653 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
654 inode->i_ctime.tv_sec);
655 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
656 inode->i_ctime.tv_nsec);
657
658 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
659 btrfs_set_inode_generation(leaf, item, inode->i_generation);
660 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
b98b6767 661 btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
5f39d397 662 btrfs_set_inode_block_group(leaf, item,
39279cc3
CM		 663 BTRFS_I(inode)->block_group->key.objectid);
664}
665
a52d9a80 666int btrfs_update_inode(struct btrfs_trans_handle *trans,
39279cc3
CM		 667 struct btrfs_root *root,
668 struct inode *inode)
669{
670 struct btrfs_inode_item *inode_item;
671 struct btrfs_path *path;
5f39d397 672 struct extent_buffer *leaf;
39279cc3
CM		 673 int ret;
674
675 path = btrfs_alloc_path();
676 BUG_ON(!path);
39279cc3
CM		 677 ret = btrfs_lookup_inode(trans, root, path,
678 &BTRFS_I(inode)->location, 1);
679 if (ret) {
680 if (ret > 0)
681 ret = -ENOENT;
682 goto failed;
683 }
684
5f39d397
CM		 685 leaf = path->nodes[0];
686 inode_item = btrfs_item_ptr(leaf, path->slots[0],
39279cc3
CM		 687 struct btrfs_inode_item);
688
5f39d397
CM		 689 fill_inode_item(leaf, inode_item, inode);
690 btrfs_mark_buffer_dirty(leaf);
15ee9bc7 691 btrfs_set_inode_last_trans(trans, inode);
39279cc3
CM		 692 ret = 0;
693failed:
694 btrfs_release_path(root, path);
695 btrfs_free_path(path);
696 return ret;
697}
698
699
700static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
701 struct btrfs_root *root,
702 struct inode *dir,
703 struct dentry *dentry)
704{
705 struct btrfs_path *path;
706 const char *name = dentry->d_name.name;
707 int name_len = dentry->d_name.len;
708 int ret = 0;
5f39d397 709 struct extent_buffer *leaf;
39279cc3 710 struct btrfs_dir_item *di;
5f39d397 711 struct btrfs_key key;
39279cc3
CM		 712
713 path = btrfs_alloc_path();
54aa1f4d
CM		 714 if (!path) {
715 ret = -ENOMEM;
716 goto err;
717 }
718
39279cc3
CM		 719 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
720 name, name_len, -1);
721 if (IS_ERR(di)) {
722 ret = PTR_ERR(di);
723 goto err;
724 }
725 if (!di) {
726 ret = -ENOENT;
727 goto err;
728 }
5f39d397
CM		 729 leaf = path->nodes[0];
730 btrfs_dir_item_key_to_cpu(leaf, di, &key);
39279cc3 731 ret = btrfs_delete_one_dir_name(trans, root, path, di);
54aa1f4d
CM		 732 if (ret)
733 goto err;
39279cc3
CM		 734 btrfs_release_path(root, path);
735
736 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
5f39d397 737 key.objectid, name, name_len, -1);
39279cc3
CM		 738 if (IS_ERR(di)) {
739 ret = PTR_ERR(di);
740 goto err;
741 }
742 if (!di) {
743 ret = -ENOENT;
744 goto err;
745 }
746 ret = btrfs_delete_one_dir_name(trans, root, path, di);
39279cc3
CM		 747
748 dentry->d_inode->i_ctime = dir->i_ctime;
76fea00a
CM		 749 ret = btrfs_del_inode_ref(trans, root, name, name_len,
750 dentry->d_inode->i_ino,
751 dentry->d_parent->d_inode->i_ino);
752 if (ret) {
753 printk("failed to delete reference to %.*s, "
754 "inode %lu parent %lu\n", name_len, name,
755 dentry->d_inode->i_ino,
756 dentry->d_parent->d_inode->i_ino);
3954401f 757 }
39279cc3
CM		 758err:
759 btrfs_free_path(path);
760 if (!ret) {
761 dir->i_size -= name_len * 2;
79c44584 762 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
39279cc3 763 btrfs_update_inode(trans, root, dir);
6da6abae
CM		 764#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
765 dentry->d_inode->i_nlink--;
766#else
39279cc3 767 drop_nlink(dentry->d_inode);
6da6abae 768#endif
54aa1f4d 769 ret = btrfs_update_inode(trans, root, dentry->d_inode);
39279cc3
CM		 770 dir->i_sb->s_dirt = 1;
771 }
772 return ret;
773}
774
775static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
776{
777 struct btrfs_root *root;
778 struct btrfs_trans_handle *trans;
2da98f00 779 struct inode *inode = dentry->d_inode;
39279cc3 780 int ret;
1832a6d5 781 unsigned long nr = 0;
39279cc3
CM		 782
783 root = BTRFS_I(dir)->root;
784 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 785
786 ret = btrfs_check_free_space(root, 1, 1);
787 if (ret)
788 goto fail;
789
39279cc3 790 trans = btrfs_start_transaction(root, 1);
5f39d397 791
39279cc3
CM		 792 btrfs_set_trans_block_group(trans, dir);
793 ret = btrfs_unlink_trans(trans, root, dir, dentry);
d3c2fdcf 794 nr = trans->blocks_used;
5f39d397 795
2da98f00
CM		 796 if (inode->i_nlink == 0) {
797 int found;
798 /* if the inode isn't linked anywhere,
799 * we don't need to worry about
800 * data=ordered
801 */
802 found = btrfs_del_ordered_inode(inode);
803 if (found == 1) {
804 atomic_dec(&inode->i_count);
805 }
806 }
807
39279cc3 808 btrfs_end_transaction(trans, root);
1832a6d5 809fail:
39279cc3 810 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 811 btrfs_btree_balance_dirty(root, nr);
e2008b61 812 btrfs_throttle(root);
39279cc3
CM		 813 return ret;
814}
815
816static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
817{
818 struct inode *inode = dentry->d_inode;
1832a6d5 819 int err = 0;
39279cc3
CM		 820 int ret;
821 struct btrfs_root *root = BTRFS_I(dir)->root;
39279cc3 822 struct btrfs_trans_handle *trans;
1832a6d5 823 unsigned long nr = 0;
39279cc3 824
134d4512
Y		 825 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
826 return -ENOTEMPTY;
827
39279cc3 828 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 829 ret = btrfs_check_free_space(root, 1, 1);
830 if (ret)
831 goto fail;
832
39279cc3
CM		 833 trans = btrfs_start_transaction(root, 1);
834 btrfs_set_trans_block_group(trans, dir);
39279cc3
CM		 835
836 /* now the directory is empty */
837 err = btrfs_unlink_trans(trans, root, dir, dentry);
838 if (!err) {
839 inode->i_size = 0;
840 }
3954401f 841
d3c2fdcf 842 nr = trans->blocks_used;
39279cc3 843 ret = btrfs_end_transaction(trans, root);
1832a6d5 844fail:
134d4512 845 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 846 btrfs_btree_balance_dirty(root, nr);
e2008b61 847 btrfs_throttle(root);
3954401f 848
39279cc3
CM		 849 if (ret && !err)
850 err = ret;
851 return err;
852}
853
39279cc3
CM		 854/*
855 * this can truncate away extent items, csum items and directory items.
856 * It starts at a high offset and removes keys until it can't find
857 * any higher than i_size.
858 *
859 * csum items that cross the new i_size are truncated to the new size
860 * as well.
861 */
862static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
863 struct btrfs_root *root,
85e21bac
CM		 864 struct inode *inode,
865 u32 min_type)
39279cc3
CM		 866{
867 int ret;
868 struct btrfs_path *path;
869 struct btrfs_key key;
5f39d397 870 struct btrfs_key found_key;
39279cc3 871 u32 found_type;
5f39d397 872 struct extent_buffer *leaf;
39279cc3
CM		 873 struct btrfs_file_extent_item *fi;
874 u64 extent_start = 0;
db94535d 875 u64 extent_num_bytes = 0;
39279cc3 876 u64 item_end = 0;
7bb86316 877 u64 root_gen = 0;
d8d5f3e1 878 u64 root_owner = 0;
39279cc3
CM		 879 int found_extent;
880 int del_item;
85e21bac
CM		 881 int pending_del_nr = 0;
882 int pending_del_slot = 0;
179e29e4 883 int extent_type = -1;
39279cc3 884
a52d9a80 885 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
39279cc3 886 path = btrfs_alloc_path();
3c69faec 887 path->reada = -1;
39279cc3 888 BUG_ON(!path);
5f39d397 889
39279cc3
CM		 890 /* FIXME, add redo link to tree so we don't leak on crash */
891 key.objectid = inode->i_ino;
892 key.offset = (u64)-1;
5f39d397
CM		 893 key.type = (u8)-1;
894
85e21bac
CM		 895 btrfs_init_path(path);
896search_again:
897 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
898 if (ret < 0) {
899 goto error;
900 }
901 if (ret > 0) {
902 BUG_ON(path->slots[0] == 0);
903 path->slots[0]--;
904 }
905
39279cc3 906 while(1) {
39279cc3 907 fi = NULL;
5f39d397
CM		 908 leaf = path->nodes[0];
909 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
910 found_type = btrfs_key_type(&found_key);
39279cc3 911
5f39d397 912 if (found_key.objectid != inode->i_ino)
39279cc3 913 break;
5f39d397 914
85e21bac 915 if (found_type < min_type)
39279cc3
CM		 916 break;
917
5f39d397 918 item_end = found_key.offset;
39279cc3 919 if (found_type == BTRFS_EXTENT_DATA_KEY) {
5f39d397 920 fi = btrfs_item_ptr(leaf, path->slots[0],
39279cc3 921 struct btrfs_file_extent_item);
179e29e4
CM		 922 extent_type = btrfs_file_extent_type(leaf, fi);
923 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
5f39d397 924 item_end +=
db94535d 925 btrfs_file_extent_num_bytes(leaf, fi);
179e29e4
CM		 926 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
927 struct btrfs_item *item = btrfs_item_nr(leaf,
928 path->slots[0]);
929 item_end += btrfs_file_extent_inline_len(leaf,
930 item);
39279cc3 931 }
008630c1 932 item_end--;
39279cc3
CM		 933 }
934 if (found_type == BTRFS_CSUM_ITEM_KEY) {
935 ret = btrfs_csum_truncate(trans, root, path,
936 inode->i_size);
937 BUG_ON(ret);
938 }
008630c1 939 if (item_end < inode->i_size) {
b888db2b
CM		 940 if (found_type == BTRFS_DIR_ITEM_KEY) {
941 found_type = BTRFS_INODE_ITEM_KEY;
942 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
943 found_type = BTRFS_CSUM_ITEM_KEY;
85e21bac
CM		 944 } else if (found_type == BTRFS_EXTENT_DATA_KEY) {
945 found_type = BTRFS_XATTR_ITEM_KEY;
946 } else if (found_type == BTRFS_XATTR_ITEM_KEY) {
947 found_type = BTRFS_INODE_REF_KEY;
b888db2b
CM		 948 } else if (found_type) {
949 found_type--;
950 } else {
951 break;
39279cc3 952 }
a61721d5 953 btrfs_set_key_type(&key, found_type);
85e21bac 954 goto next;
39279cc3 955 }
5f39d397 956 if (found_key.offset >= inode->i_size)
39279cc3
CM		 957 del_item = 1;
958 else
959 del_item = 0;
960 found_extent = 0;
961
962 /* FIXME, shrink the extent if the ref count is only 1 */
179e29e4
CM		 963 if (found_type != BTRFS_EXTENT_DATA_KEY)
964 goto delete;
965
966 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
39279cc3 967 u64 num_dec;
db94535d 968 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
39279cc3 969 if (!del_item) {
db94535d
CM		 970 u64 orig_num_bytes =
971 btrfs_file_extent_num_bytes(leaf, fi);
972 extent_num_bytes = inode->i_size -
5f39d397 973 found_key.offset + root->sectorsize - 1;
b1632b10
Y		 974 extent_num_bytes = extent_num_bytes &
975 ~((u64)root->sectorsize - 1);
db94535d
CM		 976 btrfs_set_file_extent_num_bytes(leaf, fi,
977 extent_num_bytes);
978 num_dec = (orig_num_bytes -
9069218d
CM		 979 extent_num_bytes);
980 if (extent_start != 0)
981 dec_i_blocks(inode, num_dec);
5f39d397 982 btrfs_mark_buffer_dirty(leaf);
39279cc3 983 } else {
db94535d
CM		 984 extent_num_bytes =
985 btrfs_file_extent_disk_num_bytes(leaf,
986 fi);
39279cc3 987 /* FIXME blocksize != 4096 */
9069218d 988 num_dec = btrfs_file_extent_num_bytes(leaf, fi);
39279cc3
CM		 989 if (extent_start != 0) {
990 found_extent = 1;
9069218d 991 dec_i_blocks(inode, num_dec);
39279cc3 992 }
d8d5f3e1
CM		 993 root_gen = btrfs_header_generation(leaf);
994 root_owner = btrfs_header_owner(leaf);
39279cc3 995 }
9069218d
CM		 996 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
997 if (!del_item) {
998 u32 newsize = inode->i_size - found_key.offset;
999 dec_i_blocks(inode, item_end + 1 -
1000 found_key.offset - newsize);
1001 newsize =
1002 btrfs_file_extent_calc_inline_size(newsize);
1003 ret = btrfs_truncate_item(trans, root, path,
1004 newsize, 1);
1005 BUG_ON(ret);
1006 } else {
1007 dec_i_blocks(inode, item_end + 1 -
1008 found_key.offset);
1009 }
39279cc3 1010 }
179e29e4 1011delete:
39279cc3 1012 if (del_item) {
85e21bac
CM		 1013 if (!pending_del_nr) {
1014 /* no pending yet, add ourselves */
1015 pending_del_slot = path->slots[0];
1016 pending_del_nr = 1;
1017 } else if (pending_del_nr &&
1018 path->slots[0] + 1 == pending_del_slot) {
1019 /* hop on the pending chunk */
1020 pending_del_nr++;
1021 pending_del_slot = path->slots[0];
1022 } else {
1023 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot);
1024 }
39279cc3
CM		 1025 } else {
1026 break;
1027 }
39279cc3
CM		 1028 if (found_extent) {
1029 ret = btrfs_free_extent(trans, root, extent_start,
7bb86316 1030 extent_num_bytes,
d8d5f3e1 1031 root_owner,
7bb86316
CM		 1032 root_gen, inode->i_ino,
1033 found_key.offset, 0);
39279cc3
CM		 1034 BUG_ON(ret);
1035 }
85e21bac
CM		 1036next:
1037 if (path->slots[0] == 0) {
1038 if (pending_del_nr)
1039 goto del_pending;
1040 btrfs_release_path(root, path);
1041 goto search_again;
1042 }
1043
1044 path->slots[0]--;
1045 if (pending_del_nr &&
1046 path->slots[0] + 1 != pending_del_slot) {
1047 struct btrfs_key debug;
1048del_pending:
1049 btrfs_item_key_to_cpu(path->nodes[0], &debug,
1050 pending_del_slot);
1051 ret = btrfs_del_items(trans, root, path,
1052 pending_del_slot,
1053 pending_del_nr);
1054 BUG_ON(ret);
1055 pending_del_nr = 0;
1056 btrfs_release_path(root, path);
1057 goto search_again;
1058 }
39279cc3
CM		 1059 }
1060 ret = 0;
1061error:
85e21bac
CM		 1062 if (pending_del_nr) {
1063 ret = btrfs_del_items(trans, root, path, pending_del_slot,
1064 pending_del_nr);
1065 }
39279cc3
CM		 1066 btrfs_release_path(root, path);
1067 btrfs_free_path(path);
1068 inode->i_sb->s_dirt = 1;
1069 return ret;
1070}
1071
b888db2b 1072static int btrfs_cow_one_page(struct inode *inode, struct page *page,
a52d9a80
CM		 1073 size_t zero_start)
1074{
1075 char *kaddr;
d1310b2e 1076 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
35ebb934 1077 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
b888db2b 1078 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
1832a6d5 1079 int ret = 0;
a52d9a80 1080
190662b2 1081 WARN_ON(!PageLocked(page));
b3cfa35a 1082 set_page_extent_mapped(page);
a52d9a80 1083
d1310b2e 1084 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
d1310b2e 1085 set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start,
b888db2b 1086 page_end, GFP_NOFS);
1832a6d5 1087
a52d9a80 1088 if (zero_start != PAGE_CACHE_SIZE) {
b888db2b 1089 kaddr = kmap(page);
a52d9a80
CM		 1090 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
1091 flush_dcache_page(page);
b888db2b 1092 kunmap(page);
a52d9a80 1093 }
b888db2b 1094 set_page_dirty(page);
d1310b2e 1095 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
a52d9a80 1096
a52d9a80
CM		 1097 return ret;
1098}
1099
39279cc3
CM		 1100/*
1101 * taken from block_truncate_page, but does cow as it zeros out
1102 * any bytes left in the last page in the file.
1103 */
1104static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
1105{
1106 struct inode *inode = mapping->host;
db94535d
CM		 1107 struct btrfs_root *root = BTRFS_I(inode)->root;
1108 u32 blocksize = root->sectorsize;
39279cc3
CM		 1109 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1110 unsigned offset = from & (PAGE_CACHE_SIZE-1);
1111 struct page *page;
39279cc3 1112 int ret = 0;
a52d9a80 1113 u64 page_start;
39279cc3
CM		 1114
1115 if ((offset & (blocksize - 1)) == 0)
1116 goto out;
1117
1118 ret = -ENOMEM;
1119 page = grab_cache_page(mapping, index);
1120 if (!page)
1121 goto out;
39279cc3 1122 if (!PageUptodate(page)) {
9ebefb18 1123 ret = btrfs_readpage(NULL, page);
39279cc3
CM		 1124 lock_page(page);
1125 if (!PageUptodate(page)) {
1126 ret = -EIO;
1127 goto out;
1128 }
1129 }
35ebb934 1130 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 1131
b888db2b 1132 ret = btrfs_cow_one_page(inode, page, offset);
39279cc3 1133
39279cc3
CM		 1134 unlock_page(page);
1135 page_cache_release(page);
1136out:
1137 return ret;
1138}
1139
1140static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
1141{
1142 struct inode *inode = dentry->d_inode;
1143 int err;
1144
1145 err = inode_change_ok(inode, attr);
1146 if (err)
1147 return err;
1148
1149 if (S_ISREG(inode->i_mode) &&
1150 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
1151 struct btrfs_trans_handle *trans;
1152 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 1153 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2bf5a725 1154
5f39d397 1155 u64 mask = root->sectorsize - 1;
1b0f7c29 1156 u64 hole_start = (inode->i_size + mask) & ~mask;
f392a938 1157 u64 block_end = (attr->ia_size + mask) & ~mask;
39279cc3 1158 u64 hole_size;
179e29e4 1159 u64 alloc_hint = 0;
39279cc3 1160
1b0f7c29 1161 if (attr->ia_size <= hole_start)
39279cc3
CM		 1162 goto out;
1163
1832a6d5
CM		 1164 mutex_lock(&root->fs_info->fs_mutex);
1165 err = btrfs_check_free_space(root, 1, 0);
1166 mutex_unlock(&root->fs_info->fs_mutex);
1167 if (err)
1168 goto fail;
1169
39279cc3
CM		 1170 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1171
1b0f7c29 1172 lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
5f56406a 1173 hole_size = block_end - hole_start;
39279cc3
CM		 1174
1175 mutex_lock(&root->fs_info->fs_mutex);
1176 trans = btrfs_start_transaction(root, 1);
1177 btrfs_set_trans_block_group(trans, inode);
2bf5a725 1178 err = btrfs_drop_extents(trans, root, inode,
1b0f7c29 1179 hole_start, block_end, hole_start,
3326d1b0 1180 &alloc_hint);
2bf5a725 1181
179e29e4
CM		 1182 if (alloc_hint != EXTENT_MAP_INLINE) {
1183 err = btrfs_insert_file_extent(trans, root,
1184 inode->i_ino,
5f56406a
CM		 1185 hole_start, 0, 0,
1186 hole_size);
d1310b2e
CM		 1187 btrfs_drop_extent_cache(inode, hole_start,
1188 hole_size - 1);
5f56406a 1189 btrfs_check_file(root, inode);
179e29e4 1190 }
39279cc3
CM		 1191 btrfs_end_transaction(trans, root);
1192 mutex_unlock(&root->fs_info->fs_mutex);
1b0f7c29 1193 unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
54aa1f4d
CM		 1194 if (err)
1195 return err;
39279cc3
CM		 1196 }
1197out:
1198 err = inode_setattr(inode, attr);
1832a6d5 1199fail:
39279cc3
CM		 1200 return err;
1201}
61295eb8 1202
2da98f00 1203void btrfs_put_inode(struct inode *inode)
61295eb8 1204{
2da98f00
CM		 1205 int ret;
1206
1207 if (!BTRFS_I(inode)->ordered_trans) {
61295eb8
CM		 1208 return;
1209 }
2da98f00
CM		 1210
1211 if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
1212 mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))
1213 return;
1214
1215 ret = btrfs_del_ordered_inode(inode);
1216 if (ret == 1) {
1217 atomic_dec(&inode->i_count);
1218 }
61295eb8
CM		 1219}
1220
39279cc3
CM		 1221void btrfs_delete_inode(struct inode *inode)
1222{
1223 struct btrfs_trans_handle *trans;
1224 struct btrfs_root *root = BTRFS_I(inode)->root;
d3c2fdcf 1225 unsigned long nr;
39279cc3
CM		 1226 int ret;
1227
1228 truncate_inode_pages(&inode->i_data, 0);
1229 if (is_bad_inode(inode)) {
1230 goto no_delete;
1231 }
5f39d397 1232
39279cc3
CM		 1233 inode->i_size = 0;
1234 mutex_lock(&root->fs_info->fs_mutex);
1235 trans = btrfs_start_transaction(root, 1);
5f39d397 1236
39279cc3 1237 btrfs_set_trans_block_group(trans, inode);
85e21bac 1238 ret = btrfs_truncate_in_trans(trans, root, inode, 0);
54aa1f4d
CM		 1239 if (ret)
1240 goto no_delete_lock;
85e21bac 1241
d3c2fdcf 1242 nr = trans->blocks_used;
85e21bac 1243 clear_inode(inode);
5f39d397 1244
39279cc3
CM		 1245 btrfs_end_transaction(trans, root);
1246 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1247 btrfs_btree_balance_dirty(root, nr);
e2008b61 1248 btrfs_throttle(root);
39279cc3 1249 return;
54aa1f4d
CM		 1250
1251no_delete_lock:
d3c2fdcf 1252 nr = trans->blocks_used;
54aa1f4d
CM		 1253 btrfs_end_transaction(trans, root);
1254 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1255 btrfs_btree_balance_dirty(root, nr);
e2008b61 1256 btrfs_throttle(root);
39279cc3
CM		 1257no_delete:
1258 clear_inode(inode);
1259}
1260
1261/*
1262 * this returns the key found in the dir entry in the location pointer.
1263 * If no dir entries were found, location->objectid is 0.
1264 */
1265static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1266 struct btrfs_key *location)
1267{
1268 const char *name = dentry->d_name.name;
1269 int namelen = dentry->d_name.len;
1270 struct btrfs_dir_item *di;
1271 struct btrfs_path *path;
1272 struct btrfs_root *root = BTRFS_I(dir)->root;
0d9f7f3e 1273 int ret = 0;
39279cc3 1274
3954401f
CM		 1275 if (namelen == 1 && strcmp(name, ".") == 0) {
1276 location->objectid = dir->i_ino;
1277 location->type = BTRFS_INODE_ITEM_KEY;
1278 location->offset = 0;
1279 return 0;
1280 }
39279cc3
CM		 1281 path = btrfs_alloc_path();
1282 BUG_ON(!path);
3954401f 1283
7a720536 1284 if (namelen == 2 && strcmp(name, "..") == 0) {
3954401f
CM		 1285 struct btrfs_key key;
1286 struct extent_buffer *leaf;
1287 u32 nritems;
1288 int slot;
1289
1290 key.objectid = dir->i_ino;
1291 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1292 key.offset = 0;
1293 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1294 BUG_ON(ret == 0);
1295 ret = 0;
1296
1297 leaf = path->nodes[0];
1298 slot = path->slots[0];
1299 nritems = btrfs_header_nritems(leaf);
1300 if (slot >= nritems)
1301 goto out_err;
1302
1303 btrfs_item_key_to_cpu(leaf, &key, slot);
1304 if (key.objectid != dir->i_ino ||
1305 key.type != BTRFS_INODE_REF_KEY) {
1306 goto out_err;
1307 }
1308 location->objectid = key.offset;
1309 location->type = BTRFS_INODE_ITEM_KEY;
1310 location->offset = 0;
1311 goto out;
1312 }
1313
39279cc3
CM		 1314 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1315 namelen, 0);
0d9f7f3e
Y		 1316 if (IS_ERR(di))
1317 ret = PTR_ERR(di);
39279cc3 1318 if (!di || IS_ERR(di)) {
3954401f 1319 goto out_err;
39279cc3 1320 }
5f39d397 1321 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
39279cc3 1322out:
39279cc3
CM		 1323 btrfs_free_path(path);
1324 return ret;
3954401f
CM		 1325out_err:
1326 location->objectid = 0;
1327 goto out;
39279cc3
CM		 1328}
1329
1330/*
1331 * when we hit a tree root in a directory, the btrfs part of the inode
1332 * needs to be changed to reflect the root directory of the tree root. This
1333 * is kind of like crossing a mount point.
1334 */
1335static int fixup_tree_root_location(struct btrfs_root *root,
1336 struct btrfs_key *location,
58176a96
JB		 1337 struct btrfs_root **sub_root,
1338 struct dentry *dentry)
39279cc3
CM		 1339{
1340 struct btrfs_path *path;
1341 struct btrfs_root_item *ri;
1342
1343 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1344 return 0;
1345 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1346 return 0;
1347
1348 path = btrfs_alloc_path();
1349 BUG_ON(!path);
1350 mutex_lock(&root->fs_info->fs_mutex);
1351
58176a96
JB		 1352 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1353 dentry->d_name.name,
1354 dentry->d_name.len);
39279cc3
CM		 1355 if (IS_ERR(*sub_root))
1356 return PTR_ERR(*sub_root);
1357
1358 ri = &(*sub_root)->root_item;
1359 location->objectid = btrfs_root_dirid(ri);
39279cc3
CM		 1360 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1361 location->offset = 0;
1362
1363 btrfs_free_path(path);
1364 mutex_unlock(&root->fs_info->fs_mutex);
1365 return 0;
1366}
1367
1368static int btrfs_init_locked_inode(struct inode *inode, void *p)
1369{
1370 struct btrfs_iget_args *args = p;
1371 inode->i_ino = args->ino;
1372 BTRFS_I(inode)->root = args->root;
9069218d 1373 BTRFS_I(inode)->delalloc_bytes = 0;
d1310b2e
CM		 1374 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1375 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
b888db2b 1376 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 1377 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1378 inode->i_mapping, GFP_NOFS);
39279cc3
CM		 1379 return 0;
1380}
1381
1382static int btrfs_find_actor(struct inode *inode, void *opaque)
1383{
1384 struct btrfs_iget_args *args = opaque;
1385 return (args->ino == inode->i_ino &&
1386 args->root == BTRFS_I(inode)->root);
1387}
1388
dc17ff8f
CM		 1389struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1390 u64 root_objectid)
1391{
1392 struct btrfs_iget_args args;
1393 args.ino = objectid;
1394 args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);
1395
1396 if (!args.root)
1397 return NULL;
1398
1399 return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
1400}
1401
39279cc3
CM		 1402struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1403 struct btrfs_root *root)
1404{
1405 struct inode *inode;
1406 struct btrfs_iget_args args;
1407 args.ino = objectid;
1408 args.root = root;
1409
1410 inode = iget5_locked(s, objectid, btrfs_find_actor,
1411 btrfs_init_locked_inode,
1412 (void *)&args);
1413 return inode;
1414}
1415
1416static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1417 struct nameidata *nd)
1418{
1419 struct inode * inode;
1420 struct btrfs_inode *bi = BTRFS_I(dir);
1421 struct btrfs_root *root = bi->root;
1422 struct btrfs_root *sub_root = root;
1423 struct btrfs_key location;
1424 int ret;
1425
1426 if (dentry->d_name.len > BTRFS_NAME_LEN)
1427 return ERR_PTR(-ENAMETOOLONG);
5f39d397 1428
39279cc3
CM		 1429 mutex_lock(&root->fs_info->fs_mutex);
1430 ret = btrfs_inode_by_name(dir, dentry, &location);
1431 mutex_unlock(&root->fs_info->fs_mutex);
5f39d397 1432
39279cc3
CM		 1433 if (ret < 0)
1434 return ERR_PTR(ret);
5f39d397 1435
39279cc3
CM		 1436 inode = NULL;
1437 if (location.objectid) {
58176a96
JB		 1438 ret = fixup_tree_root_location(root, &location, &sub_root,
1439 dentry);
39279cc3
CM		 1440 if (ret < 0)
1441 return ERR_PTR(ret);
1442 if (ret > 0)
1443 return ERR_PTR(-ENOENT);
1444 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1445 sub_root);
1446 if (!inode)
1447 return ERR_PTR(-EACCES);
1448 if (inode->i_state & I_NEW) {
1449 /* the inode and parent dir are two different roots */
1450 if (sub_root != root) {
1451 igrab(inode);
1452 sub_root->inode = inode;
1453 }
1454 BTRFS_I(inode)->root = sub_root;
1455 memcpy(&BTRFS_I(inode)->location, &location,
1456 sizeof(location));
1457 btrfs_read_locked_inode(inode);
1458 unlock_new_inode(inode);
1459 }
1460 }
1461 return d_splice_alias(inode, dentry);
1462}
1463
39279cc3
CM		 1464static unsigned char btrfs_filetype_table[] = {
1465 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1466};
1467
1468static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1469{
6da6abae 1470 struct inode *inode = filp->f_dentry->d_inode;
39279cc3
CM		 1471 struct btrfs_root *root = BTRFS_I(inode)->root;
1472 struct btrfs_item *item;
1473 struct btrfs_dir_item *di;
1474 struct btrfs_key key;
5f39d397 1475 struct btrfs_key found_key;
39279cc3
CM		 1476 struct btrfs_path *path;
1477 int ret;
1478 u32 nritems;
5f39d397 1479 struct extent_buffer *leaf;
39279cc3
CM		 1480 int slot;
1481 int advance;
1482 unsigned char d_type;
1483 int over = 0;
1484 u32 di_cur;
1485 u32 di_total;
1486 u32 di_len;
1487 int key_type = BTRFS_DIR_INDEX_KEY;
5f39d397
CM		 1488 char tmp_name[32];
1489 char *name_ptr;
1490 int name_len;
39279cc3
CM		 1491
1492 /* FIXME, use a real flag for deciding about the key type */
1493 if (root->fs_info->tree_root == root)
1494 key_type = BTRFS_DIR_ITEM_KEY;
5f39d397 1495
3954401f
CM		 1496 /* special case for "." */
1497 if (filp->f_pos == 0) {
1498 over = filldir(dirent, ".", 1,
1499 1, inode->i_ino,
1500 DT_DIR);
1501 if (over)
1502 return 0;
1503 filp->f_pos = 1;
1504 }
1505
39279cc3
CM		 1506 mutex_lock(&root->fs_info->fs_mutex);
1507 key.objectid = inode->i_ino;
3954401f
CM		 1508 path = btrfs_alloc_path();
1509 path->reada = 2;
1510
1511 /* special case for .., just use the back ref */
1512 if (filp->f_pos == 1) {
1513 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1514 key.offset = 0;
1515 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1516 BUG_ON(ret == 0);
1517 leaf = path->nodes[0];
1518 slot = path->slots[0];
1519 nritems = btrfs_header_nritems(leaf);
1520 if (slot >= nritems) {
1521 btrfs_release_path(root, path);
1522 goto read_dir_items;
1523 }
1524 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1525 btrfs_release_path(root, path);
1526 if (found_key.objectid != key.objectid ||
1527 found_key.type != BTRFS_INODE_REF_KEY)
1528 goto read_dir_items;
1529 over = filldir(dirent, "..", 2,
1530 2, found_key.offset, DT_DIR);
1531 if (over)
1532 goto nopos;
1533 filp->f_pos = 2;
1534 }
1535
1536read_dir_items:
39279cc3
CM		 1537 btrfs_set_key_type(&key, key_type);
1538 key.offset = filp->f_pos;
5f39d397 1539
39279cc3
CM		 1540 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1541 if (ret < 0)
1542 goto err;
1543 advance = 0;
39279cc3 1544 while(1) {
5f39d397
CM		 1545 leaf = path->nodes[0];
1546 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1547 slot = path->slots[0];
1548 if (advance || slot >= nritems) {
1549 if (slot >= nritems -1) {
39279cc3
CM		 1550 ret = btrfs_next_leaf(root, path);
1551 if (ret)
1552 break;
5f39d397
CM		 1553 leaf = path->nodes[0];
1554 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1555 slot = path->slots[0];
1556 } else {
1557 slot++;
1558 path->slots[0]++;
1559 }
1560 }
1561 advance = 1;
5f39d397
CM		 1562 item = btrfs_item_nr(leaf, slot);
1563 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1564
1565 if (found_key.objectid != key.objectid)
39279cc3 1566 break;
5f39d397 1567 if (btrfs_key_type(&found_key) != key_type)
39279cc3 1568 break;
5f39d397 1569 if (found_key.offset < filp->f_pos)
39279cc3 1570 continue;
5f39d397
CM		 1571
1572 filp->f_pos = found_key.offset;
39279cc3
CM		 1573 advance = 1;
1574 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1575 di_cur = 0;
5f39d397 1576 di_total = btrfs_item_size(leaf, item);
39279cc3 1577 while(di_cur < di_total) {
5f39d397
CM		 1578 struct btrfs_key location;
1579
1580 name_len = btrfs_dir_name_len(leaf, di);
1581 if (name_len < 32) {
1582 name_ptr = tmp_name;
1583 } else {
1584 name_ptr = kmalloc(name_len, GFP_NOFS);
1585 BUG_ON(!name_ptr);
1586 }
1587 read_extent_buffer(leaf, name_ptr,
1588 (unsigned long)(di + 1), name_len);
1589
1590 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1591 btrfs_dir_item_key_to_cpu(leaf, di, &location);
5f39d397
CM		 1592 over = filldir(dirent, name_ptr, name_len,
1593 found_key.offset,
1594 location.objectid,
39279cc3 1595 d_type);
5f39d397
CM		 1596
1597 if (name_ptr != tmp_name)
1598 kfree(name_ptr);
1599
39279cc3
CM		 1600 if (over)
1601 goto nopos;
5103e947
JB		 1602 di_len = btrfs_dir_name_len(leaf, di) +
1603 btrfs_dir_data_len(leaf, di) +sizeof(*di);
39279cc3
CM		 1604 di_cur += di_len;
1605 di = (struct btrfs_dir_item *)((char *)di + di_len);
1606 }
1607 }
5e591a07
YZ		 1608 if (key_type == BTRFS_DIR_INDEX_KEY)
1609 filp->f_pos = INT_LIMIT(typeof(filp->f_pos));
1610 else
1611 filp->f_pos++;
39279cc3
CM		 1612nopos:
1613 ret = 0;
1614err:
1615 btrfs_release_path(root, path);
1616 btrfs_free_path(path);
1617 mutex_unlock(&root->fs_info->fs_mutex);
1618 return ret;
1619}
1620
1621int btrfs_write_inode(struct inode *inode, int wait)
1622{
1623 struct btrfs_root *root = BTRFS_I(inode)->root;
1624 struct btrfs_trans_handle *trans;
1625 int ret = 0;
1626
1627 if (wait) {
1628 mutex_lock(&root->fs_info->fs_mutex);
1629 trans = btrfs_start_transaction(root, 1);
1630 btrfs_set_trans_block_group(trans, inode);
1631 ret = btrfs_commit_transaction(trans, root);
1632 mutex_unlock(&root->fs_info->fs_mutex);
1633 }
1634 return ret;
1635}
1636
1637/*
54aa1f4d 1638 * This is somewhat expensive, updating the tree every time the
39279cc3
CM		 1639 * inode changes. But, it is most likely to find the inode in cache.
1640 * FIXME, needs more benchmarking...there are no reasons other than performance
1641 * to keep or drop this code.
1642 */
1643void btrfs_dirty_inode(struct inode *inode)
1644{
1645 struct btrfs_root *root = BTRFS_I(inode)->root;
1646 struct btrfs_trans_handle *trans;
1647
1648 mutex_lock(&root->fs_info->fs_mutex);
1649 trans = btrfs_start_transaction(root, 1);
1650 btrfs_set_trans_block_group(trans, inode);
1651 btrfs_update_inode(trans, root, inode);
1652 btrfs_end_transaction(trans, root);
1653 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 1654}
1655
1656static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1657 struct btrfs_root *root,
9c58309d
CM		 1658 const char *name, int name_len,
1659 u64 ref_objectid,
39279cc3
CM		 1660 u64 objectid,
1661 struct btrfs_block_group_cache *group,
1662 int mode)
1663{
1664 struct inode *inode;
5f39d397 1665 struct btrfs_inode_item *inode_item;
6324fbf3 1666 struct btrfs_block_group_cache *new_inode_group;
39279cc3 1667 struct btrfs_key *location;
5f39d397 1668 struct btrfs_path *path;
9c58309d
CM		 1669 struct btrfs_inode_ref *ref;
1670 struct btrfs_key key[2];
1671 u32 sizes[2];
1672 unsigned long ptr;
39279cc3
CM		 1673 int ret;
1674 int owner;
1675
5f39d397
CM		 1676 path = btrfs_alloc_path();
1677 BUG_ON(!path);
1678
39279cc3
CM		 1679 inode = new_inode(root->fs_info->sb);
1680 if (!inode)
1681 return ERR_PTR(-ENOMEM);
1682
d1310b2e
CM		 1683 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1684 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
b888db2b 1685 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 1686 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1687 inode->i_mapping, GFP_NOFS);
9069218d 1688 BTRFS_I(inode)->delalloc_bytes = 0;
39279cc3 1689 BTRFS_I(inode)->root = root;
b888db2b 1690
39279cc3
CM		 1691 if (mode & S_IFDIR)
1692 owner = 0;
1693 else
1694 owner = 1;
6324fbf3 1695 new_inode_group = btrfs_find_block_group(root, group, 0,
0b86a832 1696 BTRFS_BLOCK_GROUP_METADATA, owner);
6324fbf3
CM		 1697 if (!new_inode_group) {
1698 printk("find_block group failed\n");
1699 new_inode_group = group;
1700 }
1701 BTRFS_I(inode)->block_group = new_inode_group;
b98b6767 1702 BTRFS_I(inode)->flags = 0;
9c58309d
CM		 1703
1704 key[0].objectid = objectid;
1705 btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY);
1706 key[0].offset = 0;
1707
1708 key[1].objectid = objectid;
1709 btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY);
1710 key[1].offset = ref_objectid;
1711
1712 sizes[0] = sizeof(struct btrfs_inode_item);
1713 sizes[1] = name_len + sizeof(*ref);
1714
1715 ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2);
1716 if (ret != 0)
5f39d397
CM		 1717 goto fail;
1718
9c58309d
CM		 1719 if (objectid > root->highest_inode)
1720 root->highest_inode = objectid;
1721
39279cc3
CM		 1722 inode->i_uid = current->fsuid;
1723 inode->i_gid = current->fsgid;
1724 inode->i_mode = mode;
1725 inode->i_ino = objectid;
1726 inode->i_blocks = 0;
1727 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
5f39d397
CM		 1728 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1729 struct btrfs_inode_item);
1730 fill_inode_item(path->nodes[0], inode_item, inode);
9c58309d
CM		 1731
1732 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
1733 struct btrfs_inode_ref);
1734 btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
1735 ptr = (unsigned long)(ref + 1);
1736 write_extent_buffer(path->nodes[0], name, ptr, name_len);
1737
5f39d397
CM		 1738 btrfs_mark_buffer_dirty(path->nodes[0]);
1739 btrfs_free_path(path);
1740
39279cc3
CM		 1741 location = &BTRFS_I(inode)->location;
1742 location->objectid = objectid;
39279cc3
CM		 1743 location->offset = 0;
1744 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1745
39279cc3
CM		 1746 insert_inode_hash(inode);
1747 return inode;
5f39d397
CM		 1748fail:
1749 btrfs_free_path(path);
1750 return ERR_PTR(ret);
39279cc3
CM		 1751}
1752
1753static inline u8 btrfs_inode_type(struct inode *inode)
1754{
1755 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1756}
1757
1758static int btrfs_add_link(struct btrfs_trans_handle *trans,
9c58309d
CM		 1759 struct dentry *dentry, struct inode *inode,
1760 int add_backref)
39279cc3
CM		 1761{
1762 int ret;
1763 struct btrfs_key key;
1764 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
79c44584 1765 struct inode *parent_inode;
5f39d397 1766
39279cc3 1767 key.objectid = inode->i_ino;
39279cc3
CM		 1768 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1769 key.offset = 0;
1770
1771 ret = btrfs_insert_dir_item(trans, root,
1772 dentry->d_name.name, dentry->d_name.len,
1773 dentry->d_parent->d_inode->i_ino,
1774 &key, btrfs_inode_type(inode));
1775 if (ret == 0) {
9c58309d
CM		 1776 if (add_backref) {
1777 ret = btrfs_insert_inode_ref(trans, root,
1778 dentry->d_name.name,
1779 dentry->d_name.len,
1780 inode->i_ino,
1781 dentry->d_parent->d_inode->i_ino);
1782 }
79c44584
CM		 1783 parent_inode = dentry->d_parent->d_inode;
1784 parent_inode->i_size += dentry->d_name.len * 2;
1785 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
39279cc3
CM		 1786 ret = btrfs_update_inode(trans, root,
1787 dentry->d_parent->d_inode);
1788 }
1789 return ret;
1790}
1791
1792static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
9c58309d
CM		 1793 struct dentry *dentry, struct inode *inode,
1794 int backref)
39279cc3 1795{
9c58309d 1796 int err = btrfs_add_link(trans, dentry, inode, backref);
39279cc3
CM		 1797 if (!err) {
1798 d_instantiate(dentry, inode);
1799 return 0;
1800 }
1801 if (err > 0)
1802 err = -EEXIST;
1803 return err;
1804}
1805
618e21d5
JB		 1806static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1807 int mode, dev_t rdev)
1808{
1809 struct btrfs_trans_handle *trans;
1810 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1811 struct inode *inode = NULL;
618e21d5
JB		 1812 int err;
1813 int drop_inode = 0;
1814 u64 objectid;
1832a6d5 1815 unsigned long nr = 0;
618e21d5
JB		 1816
1817 if (!new_valid_dev(rdev))
1818 return -EINVAL;
1819
1820 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1821 err = btrfs_check_free_space(root, 1, 0);
1822 if (err)
1823 goto fail;
1824
618e21d5
JB		 1825 trans = btrfs_start_transaction(root, 1);
1826 btrfs_set_trans_block_group(trans, dir);
1827
1828 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1829 if (err) {
1830 err = -ENOSPC;
1831 goto out_unlock;
1832 }
1833
9c58309d
CM		 1834 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1835 dentry->d_name.len,
1836 dentry->d_parent->d_inode->i_ino, objectid,
618e21d5
JB		 1837 BTRFS_I(dir)->block_group, mode);
1838 err = PTR_ERR(inode);
1839 if (IS_ERR(inode))
1840 goto out_unlock;
1841
1842 btrfs_set_trans_block_group(trans, inode);
9c58309d 1843 err = btrfs_add_nondir(trans, dentry, inode, 0);
618e21d5
JB		 1844 if (err)
1845 drop_inode = 1;
1846 else {
1847 inode->i_op = &btrfs_special_inode_operations;
1848 init_special_inode(inode, inode->i_mode, rdev);
1b4ab1bb 1849 btrfs_update_inode(trans, root, inode);
618e21d5
JB		 1850 }
1851 dir->i_sb->s_dirt = 1;
1852 btrfs_update_inode_block_group(trans, inode);
1853 btrfs_update_inode_block_group(trans, dir);
1854out_unlock:
d3c2fdcf 1855 nr = trans->blocks_used;
618e21d5 1856 btrfs_end_transaction(trans, root);
1832a6d5 1857fail:
618e21d5
JB		 1858 mutex_unlock(&root->fs_info->fs_mutex);
1859
1860 if (drop_inode) {
1861 inode_dec_link_count(inode);
1862 iput(inode);
1863 }
d3c2fdcf 1864 btrfs_btree_balance_dirty(root, nr);
e2008b61 1865 btrfs_throttle(root);
618e21d5
JB		 1866 return err;
1867}
1868
39279cc3
CM		 1869static int btrfs_create(struct inode *dir, struct dentry *dentry,
1870 int mode, struct nameidata *nd)
1871{
1872 struct btrfs_trans_handle *trans;
1873 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1874 struct inode *inode = NULL;
39279cc3
CM		 1875 int err;
1876 int drop_inode = 0;
1832a6d5 1877 unsigned long nr = 0;
39279cc3
CM		 1878 u64 objectid;
1879
1880 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1881 err = btrfs_check_free_space(root, 1, 0);
1882 if (err)
1883 goto fail;
39279cc3
CM		 1884 trans = btrfs_start_transaction(root, 1);
1885 btrfs_set_trans_block_group(trans, dir);
1886
1887 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1888 if (err) {
1889 err = -ENOSPC;
1890 goto out_unlock;
1891 }
1892
9c58309d
CM		 1893 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1894 dentry->d_name.len,
1895 dentry->d_parent->d_inode->i_ino,
1896 objectid, BTRFS_I(dir)->block_group, mode);
39279cc3
CM		 1897 err = PTR_ERR(inode);
1898 if (IS_ERR(inode))
1899 goto out_unlock;
1900
1901 btrfs_set_trans_block_group(trans, inode);
9c58309d 1902 err = btrfs_add_nondir(trans, dentry, inode, 0);
39279cc3
CM		 1903 if (err)
1904 drop_inode = 1;
1905 else {
1906 inode->i_mapping->a_ops = &btrfs_aops;
04160088 1907 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3
CM		 1908 inode->i_fop = &btrfs_file_operations;
1909 inode->i_op = &btrfs_file_inode_operations;
d1310b2e
CM		 1910 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1911 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
a52d9a80 1912 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 1913 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1914 inode->i_mapping, GFP_NOFS);
9069218d 1915 BTRFS_I(inode)->delalloc_bytes = 0;
d1310b2e 1916 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 1917 }
1918 dir->i_sb->s_dirt = 1;
1919 btrfs_update_inode_block_group(trans, inode);
1920 btrfs_update_inode_block_group(trans, dir);
1921out_unlock:
d3c2fdcf 1922 nr = trans->blocks_used;
39279cc3 1923 btrfs_end_transaction(trans, root);
1832a6d5 1924fail:
39279cc3
CM		 1925 mutex_unlock(&root->fs_info->fs_mutex);
1926
1927 if (drop_inode) {
1928 inode_dec_link_count(inode);
1929 iput(inode);
1930 }
d3c2fdcf 1931 btrfs_btree_balance_dirty(root, nr);
e2008b61 1932 btrfs_throttle(root);
39279cc3
CM		 1933 return err;
1934}
1935
1936static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1937 struct dentry *dentry)
1938{
1939 struct btrfs_trans_handle *trans;
1940 struct btrfs_root *root = BTRFS_I(dir)->root;
1941 struct inode *inode = old_dentry->d_inode;
1832a6d5 1942 unsigned long nr = 0;
39279cc3
CM		 1943 int err;
1944 int drop_inode = 0;
1945
1946 if (inode->i_nlink == 0)
1947 return -ENOENT;
1948
6da6abae
CM		 1949#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1950 inode->i_nlink++;
1951#else
39279cc3 1952 inc_nlink(inode);
6da6abae 1953#endif
39279cc3 1954 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1955 err = btrfs_check_free_space(root, 1, 0);
1956 if (err)
1957 goto fail;
39279cc3 1958 trans = btrfs_start_transaction(root, 1);
5f39d397 1959
39279cc3
CM		 1960 btrfs_set_trans_block_group(trans, dir);
1961 atomic_inc(&inode->i_count);
9c58309d 1962 err = btrfs_add_nondir(trans, dentry, inode, 1);
5f39d397 1963
39279cc3
CM		 1964 if (err)
1965 drop_inode = 1;
5f39d397 1966
39279cc3
CM		 1967 dir->i_sb->s_dirt = 1;
1968 btrfs_update_inode_block_group(trans, dir);
54aa1f4d 1969 err = btrfs_update_inode(trans, root, inode);
5f39d397 1970
54aa1f4d
CM		 1971 if (err)
1972 drop_inode = 1;
39279cc3 1973
d3c2fdcf 1974 nr = trans->blocks_used;
39279cc3 1975 btrfs_end_transaction(trans, root);
1832a6d5 1976fail:
39279cc3
CM		 1977 mutex_unlock(&root->fs_info->fs_mutex);
1978
1979 if (drop_inode) {
1980 inode_dec_link_count(inode);
1981 iput(inode);
1982 }
d3c2fdcf 1983 btrfs_btree_balance_dirty(root, nr);
e2008b61 1984 btrfs_throttle(root);
39279cc3
CM		 1985 return err;
1986}
1987
39279cc3
CM		 1988static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1989{
1990 struct inode *inode;
1991 struct btrfs_trans_handle *trans;
1992 struct btrfs_root *root = BTRFS_I(dir)->root;
1993 int err = 0;
1994 int drop_on_err = 0;
1995 u64 objectid;
d3c2fdcf 1996 unsigned long nr = 1;
39279cc3
CM		 1997
1998 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1999 err = btrfs_check_free_space(root, 1, 0);
2000 if (err)
2001 goto out_unlock;
2002
39279cc3
CM		 2003 trans = btrfs_start_transaction(root, 1);
2004 btrfs_set_trans_block_group(trans, dir);
5f39d397 2005
39279cc3
CM		 2006 if (IS_ERR(trans)) {
2007 err = PTR_ERR(trans);
2008 goto out_unlock;
2009 }
2010
2011 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2012 if (err) {
2013 err = -ENOSPC;
2014 goto out_unlock;
2015 }
2016
9c58309d
CM		 2017 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
2018 dentry->d_name.len,
2019 dentry->d_parent->d_inode->i_ino, objectid,
39279cc3
CM		 2020 BTRFS_I(dir)->block_group, S_IFDIR | mode);
2021 if (IS_ERR(inode)) {
2022 err = PTR_ERR(inode);
2023 goto out_fail;
2024 }
5f39d397 2025
39279cc3
CM		 2026 drop_on_err = 1;
2027 inode->i_op = &btrfs_dir_inode_operations;
2028 inode->i_fop = &btrfs_dir_file_operations;
2029 btrfs_set_trans_block_group(trans, inode);
2030
3954401f 2031 inode->i_size = 0;
39279cc3
CM		 2032 err = btrfs_update_inode(trans, root, inode);
2033 if (err)
2034 goto out_fail;
5f39d397 2035
9c58309d 2036 err = btrfs_add_link(trans, dentry, inode, 0);
39279cc3
CM		 2037 if (err)
2038 goto out_fail;
5f39d397 2039
39279cc3
CM		 2040 d_instantiate(dentry, inode);
2041 drop_on_err = 0;
2042 dir->i_sb->s_dirt = 1;
2043 btrfs_update_inode_block_group(trans, inode);
2044 btrfs_update_inode_block_group(trans, dir);
2045
2046out_fail:
d3c2fdcf 2047 nr = trans->blocks_used;
39279cc3 2048 btrfs_end_transaction(trans, root);
5f39d397 2049
39279cc3
CM		 2050out_unlock:
2051 mutex_unlock(&root->fs_info->fs_mutex);
2052 if (drop_on_err)
2053 iput(inode);
d3c2fdcf 2054 btrfs_btree_balance_dirty(root, nr);
e2008b61 2055 btrfs_throttle(root);
39279cc3
CM		 2056 return err;
2057}
2058
a52d9a80 2059struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
70dec807 2060 size_t pg_offset, u64 start, u64 len,
a52d9a80
CM		 2061 int create)
2062{
2063 int ret;
2064 int err = 0;
db94535d 2065 u64 bytenr;
a52d9a80
CM		 2066 u64 extent_start = 0;
2067 u64 extent_end = 0;
2068 u64 objectid = inode->i_ino;
2069 u32 found_type;
a52d9a80
CM		 2070 struct btrfs_path *path;
2071 struct btrfs_root *root = BTRFS_I(inode)->root;
2072 struct btrfs_file_extent_item *item;
5f39d397
CM		 2073 struct extent_buffer *leaf;
2074 struct btrfs_key found_key;
a52d9a80
CM		 2075 struct extent_map *em = NULL;
2076 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
d1310b2e 2077 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
a52d9a80
CM		 2078 struct btrfs_trans_handle *trans = NULL;
2079
2080 path = btrfs_alloc_path();
2081 BUG_ON(!path);
2082 mutex_lock(&root->fs_info->fs_mutex);
2083
2084again:
d1310b2e
CM		 2085 spin_lock(&em_tree->lock);
2086 em = lookup_extent_mapping(em_tree, start, len);
2087 spin_unlock(&em_tree->lock);
2088
a52d9a80 2089 if (em) {
56b453c9 2090 if (em->start > start) {
d1310b2e
CM		 2091 printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n",
2092 start, len, em->start, em->len);
56b453c9
CM		 2093 WARN_ON(1);
2094 }
70dec807
CM		 2095 if (em->block_start == EXTENT_MAP_INLINE && page)
2096 free_extent_map(em);
2097 else
2098 goto out;
a52d9a80 2099 }
d1310b2e 2100 em = alloc_extent_map(GFP_NOFS);
a52d9a80 2101 if (!em) {
d1310b2e
CM		 2102 err = -ENOMEM;
2103 goto out;
a52d9a80 2104 }
d1310b2e
CM		 2105
2106 em->start = EXTENT_MAP_HOLE;
2107 em->len = (u64)-1;
a52d9a80 2108 em->bdev = inode->i_sb->s_bdev;
179e29e4
CM		 2109 ret = btrfs_lookup_file_extent(trans, root, path,
2110 objectid, start, trans != NULL);
a52d9a80
CM		 2111 if (ret < 0) {
2112 err = ret;
2113 goto out;
2114 }
2115
2116 if (ret != 0) {
2117 if (path->slots[0] == 0)
2118 goto not_found;
2119 path->slots[0]--;
2120 }
2121
5f39d397
CM		 2122 leaf = path->nodes[0];
2123 item = btrfs_item_ptr(leaf, path->slots[0],
a52d9a80 2124 struct btrfs_file_extent_item);
a52d9a80 2125 /* are we inside the extent that was found? */
5f39d397
CM		 2126 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2127 found_type = btrfs_key_type(&found_key);
2128 if (found_key.objectid != objectid ||
a52d9a80
CM		 2129 found_type != BTRFS_EXTENT_DATA_KEY) {
2130 goto not_found;
2131 }
2132
5f39d397
CM		 2133 found_type = btrfs_file_extent_type(leaf, item);
2134 extent_start = found_key.offset;
a52d9a80
CM		 2135 if (found_type == BTRFS_FILE_EXTENT_REG) {
2136 extent_end = extent_start +
db94535d 2137 btrfs_file_extent_num_bytes(leaf, item);
a52d9a80 2138 err = 0;
b888db2b 2139 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 2140 em->start = start;
2141 if (start < extent_start) {
d1310b2e 2142 if (start + len <= extent_start)
b888db2b 2143 goto not_found;
d1310b2e 2144 em->len = extent_end - extent_start;
a52d9a80 2145 } else {
d1310b2e 2146 em->len = len;
a52d9a80
CM		 2147 }
2148 goto not_found_em;
2149 }
db94535d
CM		 2150 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
2151 if (bytenr == 0) {
a52d9a80 2152 em->start = extent_start;
d1310b2e 2153 em->len = extent_end - extent_start;
5f39d397 2154 em->block_start = EXTENT_MAP_HOLE;
a52d9a80
CM		 2155 goto insert;
2156 }
db94535d
CM		 2157 bytenr += btrfs_file_extent_offset(leaf, item);
2158 em->block_start = bytenr;
a52d9a80 2159 em->start = extent_start;
d1310b2e 2160 em->len = extent_end - extent_start;
a52d9a80
CM		 2161 goto insert;
2162 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
70dec807 2163 u64 page_start;
5f39d397 2164 unsigned long ptr;
a52d9a80 2165 char *map;
3326d1b0
CM		 2166 size_t size;
2167 size_t extent_offset;
2168 size_t copy_size;
a52d9a80 2169
5f39d397
CM		 2170 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
2171 path->slots[0]));
d1310b2e
CM		 2172 extent_end = (extent_start + size + root->sectorsize - 1) &
2173 ~((u64)root->sectorsize - 1);
b888db2b 2174 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 2175 em->start = start;
2176 if (start < extent_start) {
d1310b2e 2177 if (start + len <= extent_start)
b888db2b 2178 goto not_found;
d1310b2e 2179 em->len = extent_end - extent_start;
a52d9a80 2180 } else {
d1310b2e 2181 em->len = len;
a52d9a80
CM		 2182 }
2183 goto not_found_em;
2184 }
689f9346 2185 em->block_start = EXTENT_MAP_INLINE;
689f9346
Y		 2186
2187 if (!page) {
2188 em->start = extent_start;
d1310b2e 2189 em->len = size;
689f9346
Y		 2190 goto out;
2191 }
5f39d397 2192
70dec807
CM		 2193 page_start = page_offset(page) + pg_offset;
2194 extent_offset = page_start - extent_start;
2195 copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
3326d1b0 2196 size - extent_offset);
3326d1b0 2197 em->start = extent_start + extent_offset;
70dec807
CM		 2198 em->len = (copy_size + root->sectorsize - 1) &
2199 ~((u64)root->sectorsize - 1);
689f9346
Y		 2200 map = kmap(page);
2201 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
179e29e4 2202 if (create == 0 && !PageUptodate(page)) {
70dec807 2203 read_extent_buffer(leaf, map + pg_offset, ptr,
179e29e4
CM		 2204 copy_size);
2205 flush_dcache_page(page);
2206 } else if (create && PageUptodate(page)) {
2207 if (!trans) {
2208 kunmap(page);
2209 free_extent_map(em);
2210 em = NULL;
2211 btrfs_release_path(root, path);
2212 trans = btrfs_start_transaction(root, 1);
2213 goto again;
2214 }
70dec807 2215 write_extent_buffer(leaf, map + pg_offset, ptr,
179e29e4
CM		 2216 copy_size);
2217 btrfs_mark_buffer_dirty(leaf);
a52d9a80 2218 }
a52d9a80 2219 kunmap(page);
d1310b2e
CM		 2220 set_extent_uptodate(io_tree, em->start,
2221 extent_map_end(em) - 1, GFP_NOFS);
a52d9a80
CM		 2222 goto insert;
2223 } else {
2224 printk("unkknown found_type %d\n", found_type);
2225 WARN_ON(1);
2226 }
2227not_found:
2228 em->start = start;
d1310b2e 2229 em->len = len;
a52d9a80 2230not_found_em:
5f39d397 2231 em->block_start = EXTENT_MAP_HOLE;
a52d9a80
CM		 2232insert:
2233 btrfs_release_path(root, path);
d1310b2e
CM		 2234 if (em->start > start || extent_map_end(em) <= start) {
2235 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len);
a52d9a80
CM		 2236 err = -EIO;
2237 goto out;
2238 }
d1310b2e
CM		 2239
2240 err = 0;
2241 spin_lock(&em_tree->lock);
a52d9a80
CM		 2242 ret = add_extent_mapping(em_tree, em);
2243 if (ret == -EEXIST) {
2244 free_extent_map(em);
d1310b2e
CM		 2245 em = lookup_extent_mapping(em_tree, start, len);
2246 if (!em) {
a52d9a80 2247 err = -EIO;
d1310b2e 2248 printk("failing to insert %Lu %Lu\n", start, len);
a52d9a80 2249 }
a52d9a80 2250 }
d1310b2e 2251 spin_unlock(&em_tree->lock);
a52d9a80
CM		 2252out:
2253 btrfs_free_path(path);
2254 if (trans) {
2255 ret = btrfs_end_transaction(trans, root);
2256 if (!err)
2257 err = ret;
2258 }
2259 mutex_unlock(&root->fs_info->fs_mutex);
2260 if (err) {
2261 free_extent_map(em);
2262 WARN_ON(1);
2263 return ERR_PTR(err);
2264 }
2265 return em;
2266}
2267
16432985
CM		 2268static int btrfs_get_block(struct inode *inode, sector_t iblock,
2269 struct buffer_head *bh_result, int create)
2270{
2271 struct extent_map *em;
2272 u64 start = (u64)iblock << inode->i_blkbits;
2273 struct btrfs_multi_bio *multi = NULL;
2274 struct btrfs_root *root = BTRFS_I(inode)->root;
2275 u64 len;
2276 u64 logical;
2277 u64 map_length;
2278 int ret = 0;
2279
2280 em = btrfs_get_extent(inode, NULL, 0, start, bh_result->b_size, 0);
2281
2282 if (!em || IS_ERR(em))
2283 goto out;
2284
2285 if (em->start > start || em->start + em->len <= start)
2286 goto out;
2287
2288 if (em->block_start == EXTENT_MAP_INLINE) {
2289 ret = -EINVAL;
2290 goto out;
2291 }
2292
2293 if (em->block_start == EXTENT_MAP_HOLE ||
2294 em->block_start == EXTENT_MAP_DELALLOC) {
2295 goto out;
2296 }
2297
2298 len = em->start + em->len - start;
2299 len = min_t(u64, len, INT_LIMIT(typeof(bh_result->b_size)));
2300
2301 logical = start - em->start;
2302 logical = em->block_start + logical;
2303
2304 map_length = len;
2305 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
2306 logical, &map_length, &multi, 0);
2307 BUG_ON(ret);
2308 bh_result->b_blocknr = multi->stripes[0].physical >> inode->i_blkbits;
2309 bh_result->b_size = min(map_length, len);
2310 bh_result->b_bdev = multi->stripes[0].dev->bdev;
2311 set_buffer_mapped(bh_result);
2312 kfree(multi);
2313out:
2314 free_extent_map(em);
2315 return ret;
2316}
2317
2318static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
2319 const struct iovec *iov, loff_t offset,
2320 unsigned long nr_segs)
2321{
2322 struct file *file = iocb->ki_filp;
2323 struct inode *inode = file->f_mapping->host;
2324
2325 if (rw == WRITE)
2326 return -EINVAL;
2327
2328 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
2329 offset, nr_segs, btrfs_get_block, NULL);
2330}
2331
d396c6f5 2332static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
39279cc3 2333{
d396c6f5 2334 return extent_bmap(mapping, iblock, btrfs_get_extent);
39279cc3
CM		 2335}
2336
a52d9a80 2337int btrfs_readpage(struct file *file, struct page *page)
9ebefb18 2338{
d1310b2e
CM		 2339 struct extent_io_tree *tree;
2340 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80 2341 return extent_read_full_page(tree, page, btrfs_get_extent);
9ebefb18 2342}
1832a6d5 2343
a52d9a80 2344static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
39279cc3 2345{
d1310b2e 2346 struct extent_io_tree *tree;
b888db2b
CM		 2347
2348
2349 if (current->flags & PF_MEMALLOC) {
2350 redirty_page_for_writepage(wbc, page);
2351 unlock_page(page);
2352 return 0;
2353 }
d1310b2e 2354 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80 2355 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
9ebefb18
CM		 2356}
2357
b293f02e
CM		 2358static int btrfs_writepages(struct address_space *mapping,
2359 struct writeback_control *wbc)
2360{
d1310b2e
CM		 2361 struct extent_io_tree *tree;
2362 tree = &BTRFS_I(mapping->host)->io_tree;
b293f02e
CM		 2363 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2364}
2365
3ab2fb5a
CM		 2366static int
2367btrfs_readpages(struct file *file, struct address_space *mapping,
2368 struct list_head *pages, unsigned nr_pages)
2369{
d1310b2e
CM		 2370 struct extent_io_tree *tree;
2371 tree = &BTRFS_I(mapping->host)->io_tree;
3ab2fb5a
CM		 2372 return extent_readpages(tree, mapping, pages, nr_pages,
2373 btrfs_get_extent);
2374}
2375
70dec807 2376static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
9ebefb18 2377{
d1310b2e
CM		 2378 struct extent_io_tree *tree;
2379 struct extent_map_tree *map;
a52d9a80 2380 int ret;
8c2383c3 2381
d1310b2e
CM		 2382 tree = &BTRFS_I(page->mapping->host)->io_tree;
2383 map = &BTRFS_I(page->mapping->host)->extent_tree;
70dec807 2384 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
a52d9a80
CM		 2385 if (ret == 1) {
2386 ClearPagePrivate(page);
2387 set_page_private(page, 0);
2388 page_cache_release(page);
39279cc3 2389 }
a52d9a80 2390 return ret;
39279cc3
CM		 2391}
2392
a52d9a80 2393static void btrfs_invalidatepage(struct page *page, unsigned long offset)
39279cc3 2394{
d1310b2e 2395 struct extent_io_tree *tree;
39279cc3 2396
d1310b2e 2397 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80
CM		 2398 extent_invalidatepage(tree, page, offset);
2399 btrfs_releasepage(page, GFP_NOFS);
39279cc3
CM		 2400}
2401
9ebefb18
CM		 2402/*
2403 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2404 * called from a page fault handler when a page is first dirtied. Hence we must
2405 * be careful to check for EOF conditions here. We set the page up correctly
2406 * for a written page which means we get ENOSPC checking when writing into
2407 * holes and correct delalloc and unwritten extent mapping on filesystems that
2408 * support these features.
2409 *
2410 * We are not allowed to take the i_mutex here so we have to play games to
2411 * protect against truncate races as the page could now be beyond EOF. Because
2412 * vmtruncate() writes the inode size before removing pages, once we have the
2413 * page lock we can determine safely if the page is beyond EOF. If it is not
2414 * beyond EOF, then the page is guaranteed safe against truncation until we
2415 * unlock the page.
2416 */
2417int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2418{
6da6abae 2419 struct inode *inode = fdentry(vma->vm_file)->d_inode;
1832a6d5 2420 struct btrfs_root *root = BTRFS_I(inode)->root;
9ebefb18
CM		 2421 unsigned long end;
2422 loff_t size;
1832a6d5 2423 int ret;
a52d9a80 2424 u64 page_start;
9ebefb18 2425
1832a6d5
CM		 2426 mutex_lock(&root->fs_info->fs_mutex);
2427 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
8f662a76 2428 mutex_unlock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2429 if (ret)
2430 goto out;
2431
2432 ret = -EINVAL;
2433
9ebefb18
CM		 2434 lock_page(page);
2435 wait_on_page_writeback(page);
9ebefb18 2436 size = i_size_read(inode);
35ebb934 2437 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 2438
9ebefb18 2439 if ((page->mapping != inode->i_mapping) ||
a52d9a80 2440 (page_start > size)) {
9ebefb18
CM		 2441 /* page got truncated out from underneath us */
2442 goto out_unlock;
2443 }
2444
2445 /* page is wholly or partially inside EOF */
a52d9a80 2446 if (page_start + PAGE_CACHE_SIZE > size)
9ebefb18
CM		 2447 end = size & ~PAGE_CACHE_MASK;
2448 else
2449 end = PAGE_CACHE_SIZE;
2450
b888db2b 2451 ret = btrfs_cow_one_page(inode, page, end);
9ebefb18
CM		 2452
2453out_unlock:
2454 unlock_page(page);
1832a6d5 2455out:
9ebefb18
CM		 2456 return ret;
2457}
2458
39279cc3
CM		 2459static void btrfs_truncate(struct inode *inode)
2460{
2461 struct btrfs_root *root = BTRFS_I(inode)->root;
2462 int ret;
2463 struct btrfs_trans_handle *trans;
d3c2fdcf 2464 unsigned long nr;
39279cc3
CM		 2465
2466 if (!S_ISREG(inode->i_mode))
2467 return;
2468 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2469 return;
2470
2471 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2472
2473 mutex_lock(&root->fs_info->fs_mutex);
2474 trans = btrfs_start_transaction(root, 1);
2475 btrfs_set_trans_block_group(trans, inode);
2476
2477 /* FIXME, add redo link to tree so we don't leak on crash */
85e21bac
CM		 2478 ret = btrfs_truncate_in_trans(trans, root, inode,
2479 BTRFS_EXTENT_DATA_KEY);
39279cc3 2480 btrfs_update_inode(trans, root, inode);
d3c2fdcf 2481 nr = trans->blocks_used;
5f39d397 2482
39279cc3
CM		 2483 ret = btrfs_end_transaction(trans, root);
2484 BUG_ON(ret);
2485 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2486 btrfs_btree_balance_dirty(root, nr);
e2008b61 2487 btrfs_throttle(root);
39279cc3
CM		 2488}
2489
4313b399
CM		 2490static int noinline create_subvol(struct btrfs_root *root, char *name,
2491 int namelen)
39279cc3
CM		 2492{
2493 struct btrfs_trans_handle *trans;
2494 struct btrfs_key key;
2495 struct btrfs_root_item root_item;
2496 struct btrfs_inode_item *inode_item;
5f39d397 2497 struct extent_buffer *leaf;
dc17ff8f 2498 struct btrfs_root *new_root = root;
39279cc3
CM		 2499 struct inode *inode;
2500 struct inode *dir;
2501 int ret;
54aa1f4d 2502 int err;
39279cc3
CM		 2503 u64 objectid;
2504 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
d3c2fdcf 2505 unsigned long nr = 1;
39279cc3
CM		 2506
2507 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2508 ret = btrfs_check_free_space(root, 1, 0);
2509 if (ret)
2510 goto fail_commit;
2511
39279cc3
CM		 2512 trans = btrfs_start_transaction(root, 1);
2513 BUG_ON(!trans);
2514
7bb86316
CM		 2515 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2516 0, &objectid);
2517 if (ret)
2518 goto fail;
2519
2520 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2521 objectid, trans->transid, 0, 0,
2522 0, 0);
5f39d397
CM		 2523 if (IS_ERR(leaf))
2524 return PTR_ERR(leaf);
2525
2526 btrfs_set_header_nritems(leaf, 0);
2527 btrfs_set_header_level(leaf, 0);
db94535d 2528 btrfs_set_header_bytenr(leaf, leaf->start);
5f39d397 2529 btrfs_set_header_generation(leaf, trans->transid);
7bb86316
CM		 2530 btrfs_set_header_owner(leaf, objectid);
2531
5f39d397
CM		 2532 write_extent_buffer(leaf, root->fs_info->fsid,
2533 (unsigned long)btrfs_header_fsid(leaf),
2534 BTRFS_FSID_SIZE);
2535 btrfs_mark_buffer_dirty(leaf);
39279cc3
CM		 2536
2537 inode_item = &root_item.inode;
2538 memset(inode_item, 0, sizeof(*inode_item));
5f39d397
CM		 2539 inode_item->generation = cpu_to_le64(1);
2540 inode_item->size = cpu_to_le64(3);
2541 inode_item->nlink = cpu_to_le32(1);
2542 inode_item->nblocks = cpu_to_le64(1);
2543 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
39279cc3 2544
db94535d
CM		 2545 btrfs_set_root_bytenr(&root_item, leaf->start);
2546 btrfs_set_root_level(&root_item, 0);
39279cc3 2547 btrfs_set_root_refs(&root_item, 1);
5f39d397
CM		 2548 btrfs_set_root_used(&root_item, 0);
2549
5eda7b5e
CM		 2550 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2551 root_item.drop_level = 0;
5f39d397
CM		 2552
2553 free_extent_buffer(leaf);
2554 leaf = NULL;
39279cc3 2555
39279cc3
CM		 2556 btrfs_set_root_dirid(&root_item, new_dirid);
2557
2558 key.objectid = objectid;
2559 key.offset = 1;
39279cc3
CM		 2560 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2561 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2562 &root_item);
54aa1f4d
CM		 2563 if (ret)
2564 goto fail;
39279cc3
CM		 2565
2566 /*
2567 * insert the directory item
2568 */
2569 key.offset = (u64)-1;
2570 dir = root->fs_info->sb->s_root->d_inode;
2571 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2572 name, namelen, dir->i_ino, &key,
2573 BTRFS_FT_DIR);
54aa1f4d
CM		 2574 if (ret)
2575 goto fail;
39279cc3 2576
3954401f
CM		 2577 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2578 name, namelen, objectid,
2579 root->fs_info->sb->s_root->d_inode->i_ino);
2580 if (ret)
2581 goto fail;
2582
39279cc3 2583 ret = btrfs_commit_transaction(trans, root);
54aa1f4d
CM		 2584 if (ret)
2585 goto fail_commit;
39279cc3 2586
58176a96 2587 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
39279cc3
CM		 2588 BUG_ON(!new_root);
2589
2590 trans = btrfs_start_transaction(new_root, 1);
2591 BUG_ON(!trans);
2592
9c58309d
CM		 2593 inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid,
2594 new_dirid,
39279cc3 2595 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
54aa1f4d
CM		 2596 if (IS_ERR(inode))
2597 goto fail;
39279cc3
CM		 2598 inode->i_op = &btrfs_dir_inode_operations;
2599 inode->i_fop = &btrfs_dir_file_operations;
34088780 2600 new_root->inode = inode;
39279cc3 2601
3954401f
CM		 2602 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2603 new_dirid);
39279cc3 2604 inode->i_nlink = 1;
3954401f 2605 inode->i_size = 0;
39279cc3 2606 ret = btrfs_update_inode(trans, new_root, inode);
54aa1f4d
CM		 2607 if (ret)
2608 goto fail;
2609fail:
d3c2fdcf 2610 nr = trans->blocks_used;
dc17ff8f 2611 err = btrfs_commit_transaction(trans, new_root);
54aa1f4d
CM		 2612 if (err && !ret)
2613 ret = err;
2614fail_commit:
39279cc3 2615 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2616 btrfs_btree_balance_dirty(root, nr);
e2008b61 2617 btrfs_throttle(root);
54aa1f4d 2618 return ret;
39279cc3
CM		 2619}
2620
2621static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2622{
3063d29f 2623 struct btrfs_pending_snapshot *pending_snapshot;
39279cc3 2624 struct btrfs_trans_handle *trans;
39279cc3 2625 int ret;
54aa1f4d 2626 int err;
1832a6d5 2627 unsigned long nr = 0;
39279cc3
CM		 2628
2629 if (!root->ref_cows)
2630 return -EINVAL;
2631
2632 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2633 ret = btrfs_check_free_space(root, 1, 0);
2634 if (ret)
2635 goto fail_unlock;
2636
3063d29f
CM		 2637 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
2638 if (!pending_snapshot) {
2639 ret = -ENOMEM;
2640 goto fail_unlock;
2641 }
fb4bc1e0 2642 pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
3063d29f
CM		 2643 if (!pending_snapshot->name) {
2644 ret = -ENOMEM;
2645 kfree(pending_snapshot);
2646 goto fail_unlock;
2647 }
fb4bc1e0
Y		 2648 memcpy(pending_snapshot->name, name, namelen);
2649 pending_snapshot->name[namelen] = '\0';
39279cc3
CM		 2650 trans = btrfs_start_transaction(root, 1);
2651 BUG_ON(!trans);
3063d29f
CM		 2652 pending_snapshot->root = root;
2653 list_add(&pending_snapshot->list,
2654 &trans->transaction->pending_snapshots);
39279cc3 2655 ret = btrfs_update_inode(trans, root, root->inode);
54aa1f4d 2656 err = btrfs_commit_transaction(trans, root);
5f39d397 2657
1832a6d5 2658fail_unlock:
39279cc3 2659 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2660 btrfs_btree_balance_dirty(root, nr);
e2008b61 2661 btrfs_throttle(root);
54aa1f4d 2662 return ret;
39279cc3
CM		 2663}
2664
edbd8d4e 2665unsigned long btrfs_force_ra(struct address_space *mapping,
86479a04
CM		 2666 struct file_ra_state *ra, struct file *file,
2667 pgoff_t offset, pgoff_t last_index)
2668{
2669 pgoff_t req_size;
2670
2671#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2672 req_size = last_index - offset + 1;
2673 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2674 return offset;
2675#else
2676 req_size = min(last_index - offset + 1, (pgoff_t)128);
2677 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2678 return offset + req_size;
2679#endif
2680}
2681
2682int btrfs_defrag_file(struct file *file) {
6da6abae 2683 struct inode *inode = fdentry(file)->d_inode;
1832a6d5 2684 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 2685 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
86479a04
CM		 2686 struct page *page;
2687 unsigned long last_index;
2688 unsigned long ra_index = 0;
2689 u64 page_start;
2690 u64 page_end;
2691 unsigned long i;
1832a6d5
CM		 2692 int ret;
2693
2694 mutex_lock(&root->fs_info->fs_mutex);
2695 ret = btrfs_check_free_space(root, inode->i_size, 0);
2696 mutex_unlock(&root->fs_info->fs_mutex);
2697 if (ret)
2698 return -ENOSPC;
86479a04
CM		 2699
2700 mutex_lock(&inode->i_mutex);
2701 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2702 for (i = 0; i <= last_index; i++) {
2703 if (i == ra_index) {
edbd8d4e
CM		 2704 ra_index = btrfs_force_ra(inode->i_mapping,
2705 &file->f_ra,
2706 file, ra_index, last_index);
86479a04
CM		 2707 }
2708 page = grab_cache_page(inode->i_mapping, i);
2709 if (!page)
2710 goto out_unlock;
2711 if (!PageUptodate(page)) {
2712 btrfs_readpage(NULL, page);
2713 lock_page(page);
2714 if (!PageUptodate(page)) {
2715 unlock_page(page);
2716 page_cache_release(page);
2717 goto out_unlock;
2718 }
2719 }
35ebb934 2720 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
86479a04
CM		 2721 page_end = page_start + PAGE_CACHE_SIZE - 1;
2722
d1310b2e 2723 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
d1310b2e 2724 set_extent_delalloc(io_tree, page_start,
86479a04 2725 page_end, GFP_NOFS);
edbd8d4e 2726
d1310b2e 2727 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
86479a04
CM		 2728 set_page_dirty(page);
2729 unlock_page(page);
2730 page_cache_release(page);
2731 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2732 }
2733
2734out_unlock:
2735 mutex_unlock(&inode->i_mutex);
2736 return 0;
2737}
2738
edbd8d4e
CM		 2739static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2740{
2741 u64 new_size;
2742 u64 old_size;
2743 struct btrfs_ioctl_vol_args *vol_args;
2744 struct btrfs_trans_handle *trans;
2745 char *sizestr;
2746 int ret = 0;
2747 int namelen;
2748 int mod = 0;
2749
2750 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2751
2752 if (!vol_args)
2753 return -ENOMEM;
2754
2755 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2756 ret = -EFAULT;
2757 goto out;
2758 }
2759 namelen = strlen(vol_args->name);
2760 if (namelen > BTRFS_VOL_NAME_MAX) {
2761 ret = -EINVAL;
2762 goto out;
2763 }
2764
2765 sizestr = vol_args->name;
2766 if (!strcmp(sizestr, "max"))
2767 new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
2768 else {
2769 if (sizestr[0] == '-') {
2770 mod = -1;
2771 sizestr++;
2772 } else if (sizestr[0] == '+') {
2773 mod = 1;
2774 sizestr++;
2775 }
2776 new_size = btrfs_parse_size(sizestr);
2777 if (new_size == 0) {
2778 ret = -EINVAL;
2779 goto out;
2780 }
2781 }
2782
2783 mutex_lock(&root->fs_info->fs_mutex);
2784 old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);
2785
2786 if (mod < 0) {
2787 if (new_size > old_size) {
2788 ret = -EINVAL;
2789 goto out_unlock;
2790 }
2791 new_size = old_size - new_size;
2792 } else if (mod > 0) {
2793 new_size = old_size + new_size;
2794 }
2795
2796 if (new_size < 256 * 1024 * 1024) {
2797 ret = -EINVAL;
2798 goto out_unlock;
2799 }
2800 if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
2801 ret = -EFBIG;
2802 goto out_unlock;
2803 }
f9ef6604
CM		 2804
2805 do_div(new_size, root->sectorsize);
2806 new_size *= root->sectorsize;
edbd8d4e
CM		 2807
2808printk("new size is %Lu\n", new_size);
2809 if (new_size > old_size) {
2810 trans = btrfs_start_transaction(root, 1);
2811 ret = btrfs_grow_extent_tree(trans, root, new_size);
2812 btrfs_commit_transaction(trans, root);
2813 } else {
2814 ret = btrfs_shrink_extent_tree(root, new_size);
2815 }
2816
2817out_unlock:
2818 mutex_unlock(&root->fs_info->fs_mutex);
2819out:
2820 kfree(vol_args);
2821 return ret;
2822}
2823
4313b399
CM		 2824static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
2825 void __user *arg)
39279cc3 2826{
4aec2b52 2827 struct btrfs_ioctl_vol_args *vol_args;
39279cc3 2828 struct btrfs_dir_item *di;
39279cc3
CM		 2829 struct btrfs_path *path;
2830 u64 root_dirid;
4aec2b52
CM		 2831 int namelen;
2832 int ret;
39279cc3 2833
4aec2b52 2834 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
5f39d397 2835
4aec2b52
CM		 2836 if (!vol_args)
2837 return -ENOMEM;
2838
2839 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2840 ret = -EFAULT;
2841 goto out;
2842 }
2843
2844 namelen = strlen(vol_args->name);
2845 if (namelen > BTRFS_VOL_NAME_MAX) {
2846 ret = -EINVAL;
2847 goto out;
2848 }
2849 if (strchr(vol_args->name, '/')) {
2850 ret = -EINVAL;
2851 goto out;
2852 }
d03581f4
CH		 2853
2854 path = btrfs_alloc_path();
4aec2b52
CM		 2855 if (!path) {
2856 ret = -ENOMEM;
2857 goto out;
2858 }
d03581f4
CH		 2859
2860 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2861 mutex_lock(&root->fs_info->fs_mutex);
2862 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2863 path, root_dirid,
4aec2b52 2864 vol_args->name, namelen, 0);
d03581f4
CH		 2865 mutex_unlock(&root->fs_info->fs_mutex);
2866 btrfs_free_path(path);
4aec2b52
CM		 2867
2868 if (di && !IS_ERR(di)) {
2869 ret = -EEXIST;
2870 goto out;
2871 }
2872
2873 if (IS_ERR(di)) {
2874 ret = PTR_ERR(di);
2875 goto out;
2876 }
d03581f4
CH		 2877
2878 if (root == root->fs_info->tree_root)
4aec2b52
CM		 2879 ret = create_subvol(root, vol_args->name, namelen);
2880 else
2881 ret = create_snapshot(root, vol_args->name, namelen);
2882out:
2883 kfree(vol_args);
2884 return ret;
d03581f4
CH		 2885}
2886
2887static int btrfs_ioctl_defrag(struct file *file)
2888{
6da6abae 2889 struct inode *inode = fdentry(file)->d_inode;
d03581f4
CH		 2890 struct btrfs_root *root = BTRFS_I(inode)->root;
2891
2892 switch (inode->i_mode & S_IFMT) {
2893 case S_IFDIR:
39279cc3 2894 mutex_lock(&root->fs_info->fs_mutex);
d03581f4
CH		 2895 btrfs_defrag_root(root, 0);
2896 btrfs_defrag_root(root->fs_info->extent_root, 0);
39279cc3 2897 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3 2898 break;
d03581f4
CH		 2899 case S_IFREG:
2900 btrfs_defrag_file(file);
2901 break;
2902 }
2903
2904 return 0;
2905}
6702ed49 2906
d03581f4
CH		 2907long btrfs_ioctl(struct file *file, unsigned int
2908 cmd, unsigned long arg)
2909{
6da6abae 2910 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
d03581f4
CH		 2911
2912 switch (cmd) {
2913 case BTRFS_IOC_SNAP_CREATE:
2914 return btrfs_ioctl_snap_create(root, (void __user *)arg);
6702ed49 2915 case BTRFS_IOC_DEFRAG:
d03581f4 2916 return btrfs_ioctl_defrag(file);
edbd8d4e
CM		 2917 case BTRFS_IOC_RESIZE:
2918 return btrfs_ioctl_resize(root, (void __user *)arg);
39279cc3 2919 }
d03581f4
CH		 2920
2921 return -ENOTTY;
39279cc3
CM		 2922}
2923
39279cc3
CM		 2924/*
2925 * Called inside transaction, so use GFP_NOFS
2926 */
2927struct inode *btrfs_alloc_inode(struct super_block *sb)
2928{
2929 struct btrfs_inode *ei;
2930
2931 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2932 if (!ei)
2933 return NULL;
15ee9bc7 2934 ei->last_trans = 0;
dc17ff8f 2935 ei->ordered_trans = 0;
39279cc3
CM		 2936 return &ei->vfs_inode;
2937}
2938
2939void btrfs_destroy_inode(struct inode *inode)
2940{
2941 WARN_ON(!list_empty(&inode->i_dentry));
2942 WARN_ON(inode->i_data.nrpages);
2943
8c416c9e 2944 btrfs_drop_extent_cache(inode, 0, (u64)-1);
39279cc3
CM		 2945 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2946}
2947
44ec0b71
CM		 2948#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2949static void init_once(struct kmem_cache * cachep, void *foo)
2950#else
39279cc3
CM		 2951static void init_once(void * foo, struct kmem_cache * cachep,
2952 unsigned long flags)
44ec0b71 2953#endif
39279cc3
CM		 2954{
2955 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2956
2957 inode_init_once(&ei->vfs_inode);
2958}
2959
2960void btrfs_destroy_cachep(void)
2961{
2962 if (btrfs_inode_cachep)
2963 kmem_cache_destroy(btrfs_inode_cachep);
2964 if (btrfs_trans_handle_cachep)
2965 kmem_cache_destroy(btrfs_trans_handle_cachep);
2966 if (btrfs_transaction_cachep)
2967 kmem_cache_destroy(btrfs_transaction_cachep);
2968 if (btrfs_bit_radix_cachep)
2969 kmem_cache_destroy(btrfs_bit_radix_cachep);
2970 if (btrfs_path_cachep)
2971 kmem_cache_destroy(btrfs_path_cachep);
2972}
2973
86479a04 2974struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
92fee66d 2975 unsigned long extra_flags,
44ec0b71
CM		 2976#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2977 void (*ctor)(struct kmem_cache *, void *)
2978#else
92fee66d 2979 void (*ctor)(void *, struct kmem_cache *,
44ec0b71
CM		 2980 unsigned long)
2981#endif
2982 )
92fee66d
CM		 2983{
2984 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2985 SLAB_MEM_SPREAD | extra_flags), ctor
2986#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2987 ,NULL
2988#endif
2989 );
2990}
2991
39279cc3
CM		 2992int btrfs_init_cachep(void)
2993{
86479a04 2994 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
92fee66d
CM		 2995 sizeof(struct btrfs_inode),
2996 0, init_once);
39279cc3
CM		 2997 if (!btrfs_inode_cachep)
2998 goto fail;
86479a04
CM		 2999 btrfs_trans_handle_cachep =
3000 btrfs_cache_create("btrfs_trans_handle_cache",
3001 sizeof(struct btrfs_trans_handle),
3002 0, NULL);
39279cc3
CM		 3003 if (!btrfs_trans_handle_cachep)
3004 goto fail;
86479a04 3005 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
39279cc3 3006 sizeof(struct btrfs_transaction),
92fee66d 3007 0, NULL);
39279cc3
CM		 3008 if (!btrfs_transaction_cachep)
3009 goto fail;
86479a04 3010 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
23223584 3011 sizeof(struct btrfs_path),
92fee66d 3012 0, NULL);
39279cc3
CM		 3013 if (!btrfs_path_cachep)
3014 goto fail;
86479a04 3015 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
92fee66d 3016 SLAB_DESTROY_BY_RCU, NULL);
39279cc3
CM		 3017 if (!btrfs_bit_radix_cachep)
3018 goto fail;
3019 return 0;
3020fail:
3021 btrfs_destroy_cachep();
3022 return -ENOMEM;
3023}
3024
3025static int btrfs_getattr(struct vfsmount *mnt,
3026 struct dentry *dentry, struct kstat *stat)
3027{
3028 struct inode *inode = dentry->d_inode;
3029 generic_fillattr(inode, stat);
d6667462 3030 stat->blksize = PAGE_CACHE_SIZE;
9069218d 3031 stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9);
39279cc3
CM		 3032 return 0;
3033}
3034
3035static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
3036 struct inode * new_dir,struct dentry *new_dentry)
3037{
3038 struct btrfs_trans_handle *trans;
3039 struct btrfs_root *root = BTRFS_I(old_dir)->root;
3040 struct inode *new_inode = new_dentry->d_inode;
3041 struct inode *old_inode = old_dentry->d_inode;
3042 struct timespec ctime = CURRENT_TIME;
3043 struct btrfs_path *path;
39279cc3
CM		 3044 int ret;
3045
3046 if (S_ISDIR(old_inode->i_mode) && new_inode &&
3047 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
3048 return -ENOTEMPTY;
3049 }
5f39d397 3050
39279cc3 3051 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 3052 ret = btrfs_check_free_space(root, 1, 0);
3053 if (ret)
3054 goto out_unlock;
3055
39279cc3 3056 trans = btrfs_start_transaction(root, 1);
5f39d397 3057
39279cc3
CM		 3058 btrfs_set_trans_block_group(trans, new_dir);
3059 path = btrfs_alloc_path();
3060 if (!path) {
3061 ret = -ENOMEM;
3062 goto out_fail;
3063 }
3064
3065 old_dentry->d_inode->i_nlink++;
3066 old_dir->i_ctime = old_dir->i_mtime = ctime;
3067 new_dir->i_ctime = new_dir->i_mtime = ctime;
3068 old_inode->i_ctime = ctime;
5f39d397 3069
39279cc3
CM		 3070 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
3071 if (ret)
3072 goto out_fail;
3073
3074 if (new_inode) {
3075 new_inode->i_ctime = CURRENT_TIME;
3076 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
3077 if (ret)
3078 goto out_fail;
39279cc3 3079 }
9c58309d 3080 ret = btrfs_add_link(trans, new_dentry, old_inode, 1);
39279cc3
CM		 3081 if (ret)
3082 goto out_fail;
3083
3084out_fail:
3085 btrfs_free_path(path);
3086 btrfs_end_transaction(trans, root);
1832a6d5 3087out_unlock:
39279cc3
CM		 3088 mutex_unlock(&root->fs_info->fs_mutex);
3089 return ret;
3090}
3091
3092static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
3093 const char *symname)
3094{
3095 struct btrfs_trans_handle *trans;
3096 struct btrfs_root *root = BTRFS_I(dir)->root;
3097 struct btrfs_path *path;
3098 struct btrfs_key key;
1832a6d5 3099 struct inode *inode = NULL;
39279cc3
CM		 3100 int err;
3101 int drop_inode = 0;
3102 u64 objectid;
3103 int name_len;
3104 int datasize;
5f39d397 3105 unsigned long ptr;
39279cc3 3106 struct btrfs_file_extent_item *ei;
5f39d397 3107 struct extent_buffer *leaf;
1832a6d5 3108 unsigned long nr = 0;
39279cc3
CM		 3109
3110 name_len = strlen(symname) + 1;
3111 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
3112 return -ENAMETOOLONG;
1832a6d5 3113
39279cc3 3114 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 3115 err = btrfs_check_free_space(root, 1, 0);
3116 if (err)
3117 goto out_fail;
3118
39279cc3
CM		 3119 trans = btrfs_start_transaction(root, 1);
3120 btrfs_set_trans_block_group(trans, dir);
3121
3122 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
3123 if (err) {
3124 err = -ENOSPC;
3125 goto out_unlock;
3126 }
3127
9c58309d
CM		 3128 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
3129 dentry->d_name.len,
3130 dentry->d_parent->d_inode->i_ino, objectid,
39279cc3
CM		 3131 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
3132 err = PTR_ERR(inode);
3133 if (IS_ERR(inode))
3134 goto out_unlock;
3135
3136 btrfs_set_trans_block_group(trans, inode);
9c58309d 3137 err = btrfs_add_nondir(trans, dentry, inode, 0);
39279cc3
CM		 3138 if (err)
3139 drop_inode = 1;
3140 else {
3141 inode->i_mapping->a_ops = &btrfs_aops;
04160088 3142 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3
CM		 3143 inode->i_fop = &btrfs_file_operations;
3144 inode->i_op = &btrfs_file_inode_operations;
d1310b2e
CM		 3145 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
3146 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
a52d9a80 3147 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 3148 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
3149 inode->i_mapping, GFP_NOFS);
9069218d 3150 BTRFS_I(inode)->delalloc_bytes = 0;
d1310b2e 3151 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 3152 }
3153 dir->i_sb->s_dirt = 1;
3154 btrfs_update_inode_block_group(trans, inode);
3155 btrfs_update_inode_block_group(trans, dir);
3156 if (drop_inode)
3157 goto out_unlock;
3158
3159 path = btrfs_alloc_path();
3160 BUG_ON(!path);
3161 key.objectid = inode->i_ino;
3162 key.offset = 0;
39279cc3
CM		 3163 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
3164 datasize = btrfs_file_extent_calc_inline_size(name_len);
3165 err = btrfs_insert_empty_item(trans, root, path, &key,
3166 datasize);
54aa1f4d
CM		 3167 if (err) {
3168 drop_inode = 1;
3169 goto out_unlock;
3170 }
5f39d397
CM		 3171 leaf = path->nodes[0];
3172 ei = btrfs_item_ptr(leaf, path->slots[0],
3173 struct btrfs_file_extent_item);
3174 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
3175 btrfs_set_file_extent_type(leaf, ei,
39279cc3
CM		 3176 BTRFS_FILE_EXTENT_INLINE);
3177 ptr = btrfs_file_extent_inline_start(ei);
5f39d397
CM		 3178 write_extent_buffer(leaf, symname, ptr, name_len);
3179 btrfs_mark_buffer_dirty(leaf);
39279cc3 3180 btrfs_free_path(path);
5f39d397 3181
39279cc3
CM		 3182 inode->i_op = &btrfs_symlink_inode_operations;
3183 inode->i_mapping->a_ops = &btrfs_symlink_aops;
04160088 3184 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3 3185 inode->i_size = name_len - 1;
54aa1f4d
CM		 3186 err = btrfs_update_inode(trans, root, inode);
3187 if (err)
3188 drop_inode = 1;
39279cc3
CM		 3189
3190out_unlock:
d3c2fdcf 3191 nr = trans->blocks_used;
39279cc3 3192 btrfs_end_transaction(trans, root);
1832a6d5 3193out_fail:
39279cc3 3194 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 3195 if (drop_inode) {
3196 inode_dec_link_count(inode);
3197 iput(inode);
3198 }
d3c2fdcf 3199 btrfs_btree_balance_dirty(root, nr);
e2008b61 3200 btrfs_throttle(root);
39279cc3
CM		 3201 return err;
3202}
16432985 3203
fdebe2bd
Y		 3204static int btrfs_permission(struct inode *inode, int mask,
3205 struct nameidata *nd)
3206{
3207 if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
3208 return -EACCES;
3209 return generic_permission(inode, mask, NULL);
3210}
39279cc3
CM		 3211
3212static struct inode_operations btrfs_dir_inode_operations = {
3213 .lookup = btrfs_lookup,
3214 .create = btrfs_create,
3215 .unlink = btrfs_unlink,
3216 .link = btrfs_link,
3217 .mkdir = btrfs_mkdir,
3218 .rmdir = btrfs_rmdir,
3219 .rename = btrfs_rename,
3220 .symlink = btrfs_symlink,
3221 .setattr = btrfs_setattr,
618e21d5 3222 .mknod = btrfs_mknod,
5103e947
JB		 3223 .setxattr = generic_setxattr,
3224 .getxattr = generic_getxattr,
3225 .listxattr = btrfs_listxattr,
3226 .removexattr = generic_removexattr,
fdebe2bd 3227 .permission = btrfs_permission,
39279cc3 3228};
39279cc3
CM		 3229static struct inode_operations btrfs_dir_ro_inode_operations = {
3230 .lookup = btrfs_lookup,
fdebe2bd 3231 .permission = btrfs_permission,
39279cc3 3232};
39279cc3
CM		 3233static struct file_operations btrfs_dir_file_operations = {
3234 .llseek = generic_file_llseek,
3235 .read = generic_read_dir,
3236 .readdir = btrfs_readdir,
34287aa3 3237 .unlocked_ioctl = btrfs_ioctl,
39279cc3 3238#ifdef CONFIG_COMPAT
34287aa3 3239 .compat_ioctl = btrfs_ioctl,
39279cc3
CM		 3240#endif
3241};
3242
d1310b2e 3243static struct extent_io_ops btrfs_extent_io_ops = {
07157aac 3244 .fill_delalloc = run_delalloc_range,
065631f6 3245 .submit_bio_hook = btrfs_submit_bio_hook,
239b14b3 3246 .merge_bio_hook = btrfs_merge_bio_hook,
07157aac
CM		 3247 .readpage_io_hook = btrfs_readpage_io_hook,
3248 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
7e38326f 3249 .readpage_io_failed_hook = btrfs_readpage_io_failed_hook,
b0c68f8b
CM		 3250 .set_bit_hook = btrfs_set_bit_hook,
3251 .clear_bit_hook = btrfs_clear_bit_hook,
07157aac
CM		 3252};
3253
39279cc3
CM		 3254static struct address_space_operations btrfs_aops = {
3255 .readpage = btrfs_readpage,
3256 .writepage = btrfs_writepage,
b293f02e 3257 .writepages = btrfs_writepages,
3ab2fb5a 3258 .readpages = btrfs_readpages,
39279cc3 3259 .sync_page = block_sync_page,
39279cc3 3260 .bmap = btrfs_bmap,
16432985 3261 .direct_IO = btrfs_direct_IO,
a52d9a80
CM		 3262 .invalidatepage = btrfs_invalidatepage,
3263 .releasepage = btrfs_releasepage,
3264 .set_page_dirty = __set_page_dirty_nobuffers,
39279cc3
CM		 3265};
3266
3267static struct address_space_operations btrfs_symlink_aops = {
3268 .readpage = btrfs_readpage,
3269 .writepage = btrfs_writepage,
2bf5a725
CM		 3270 .invalidatepage = btrfs_invalidatepage,
3271 .releasepage = btrfs_releasepage,
39279cc3
CM		 3272};
3273
3274static struct inode_operations btrfs_file_inode_operations = {
3275 .truncate = btrfs_truncate,
3276 .getattr = btrfs_getattr,
3277 .setattr = btrfs_setattr,
5103e947
JB		 3278 .setxattr = generic_setxattr,
3279 .getxattr = generic_getxattr,
3280 .listxattr = btrfs_listxattr,
3281 .removexattr = generic_removexattr,
fdebe2bd 3282 .permission = btrfs_permission,
39279cc3 3283};
618e21d5
JB		 3284static struct inode_operations btrfs_special_inode_operations = {
3285 .getattr = btrfs_getattr,
3286 .setattr = btrfs_setattr,
fdebe2bd 3287 .permission = btrfs_permission,
618e21d5 3288};
39279cc3
CM		 3289static struct inode_operations btrfs_symlink_inode_operations = {
3290 .readlink = generic_readlink,
3291 .follow_link = page_follow_link_light,
3292 .put_link = page_put_link,
fdebe2bd 3293 .permission = btrfs_permission,
39279cc3 3294};
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