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Btrfs: Add ACL support
[linux-2.6-block.git] / fs / btrfs / inode.c
CommitLineData
6cbd5570
CM		 1/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
8f18cf13 19#include <linux/kernel.h>
065631f6 20#include <linux/bio.h>
39279cc3 21#include <linux/buffer_head.h>
f2eb0a24 22#include <linux/file.h>
39279cc3
CM		 23#include <linux/fs.h>
24#include <linux/pagemap.h>
25#include <linux/highmem.h>
26#include <linux/time.h>
27#include <linux/init.h>
28#include <linux/string.h>
29#include <linux/smp_lock.h>
30#include <linux/backing-dev.h>
31#include <linux/mpage.h>
32#include <linux/swap.h>
33#include <linux/writeback.h>
34#include <linux/statfs.h>
35#include <linux/compat.h>
9ebefb18 36#include <linux/bit_spinlock.h>
92fee66d 37#include <linux/version.h>
5103e947 38#include <linux/xattr.h>
33268eaf 39#include <linux/posix_acl.h>
39279cc3
CM		 40#include "ctree.h"
41#include "disk-io.h"
42#include "transaction.h"
43#include "btrfs_inode.h"
44#include "ioctl.h"
45#include "print-tree.h"
0b86a832 46#include "volumes.h"
e6dcd2dc 47#include "ordered-data.h"
39279cc3
CM		 48
49struct btrfs_iget_args {
50 u64 ino;
51 struct btrfs_root *root;
52};
53
54static struct inode_operations btrfs_dir_inode_operations;
55static struct inode_operations btrfs_symlink_inode_operations;
56static struct inode_operations btrfs_dir_ro_inode_operations;
618e21d5 57static struct inode_operations btrfs_special_inode_operations;
39279cc3
CM		 58static struct inode_operations btrfs_file_inode_operations;
59static struct address_space_operations btrfs_aops;
60static struct address_space_operations btrfs_symlink_aops;
61static struct file_operations btrfs_dir_file_operations;
d1310b2e 62static struct extent_io_ops btrfs_extent_io_ops;
39279cc3
CM		 63
64static struct kmem_cache *btrfs_inode_cachep;
65struct kmem_cache *btrfs_trans_handle_cachep;
66struct kmem_cache *btrfs_transaction_cachep;
67struct kmem_cache *btrfs_bit_radix_cachep;
68struct kmem_cache *btrfs_path_cachep;
69
70#define S_SHIFT 12
71static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
72 [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
73 [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
74 [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
75 [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
76 [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
77 [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
78 [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
79};
80
1832a6d5
CM		 81int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
82 int for_del)
83{
a2135011
CM		 84 u64 total;
85 u64 used;
1832a6d5 86 u64 thresh;
bcbfce8a 87 unsigned long flags;
1832a6d5
CM		 88 int ret = 0;
89
a2135011
CM		 90 spin_lock_irqsave(&root->fs_info->delalloc_lock, flags);
91 total = btrfs_super_total_bytes(&root->fs_info->super_copy);
92 used = btrfs_super_bytes_used(&root->fs_info->super_copy);
1832a6d5 93 if (for_del)
f9ef6604 94 thresh = total * 90;
1832a6d5 95 else
f9ef6604
CM		 96 thresh = total * 85;
97
98 do_div(thresh, 100);
1832a6d5 99
1832a6d5
CM		 100 if (used + root->fs_info->delalloc_bytes + num_required > thresh)
101 ret = -ENOSPC;
bcbfce8a 102 spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags);
1832a6d5
CM		 103 return ret;
104}
105
be20aa9d 106static int cow_file_range(struct inode *inode, u64 start, u64 end)
b888db2b
CM		 107{
108 struct btrfs_root *root = BTRFS_I(inode)->root;
109 struct btrfs_trans_handle *trans;
b888db2b 110 u64 alloc_hint = 0;
db94535d 111 u64 num_bytes;
c59f8951 112 u64 cur_alloc_size;
db94535d 113 u64 blocksize = root->sectorsize;
d1310b2e 114 u64 orig_num_bytes;
be20aa9d 115 struct btrfs_key ins;
e6dcd2dc
CM		 116 struct extent_map *em;
117 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
118 int ret = 0;
b888db2b 119
f9295749 120 trans = btrfs_join_transaction(root, 1);
b888db2b 121 BUG_ON(!trans);
be20aa9d
CM		 122 btrfs_set_trans_block_group(trans, inode);
123
db94535d 124 num_bytes = (end - start + blocksize) & ~(blocksize - 1);
be20aa9d 125 num_bytes = max(blocksize, num_bytes);
d1310b2e 126 orig_num_bytes = num_bytes;
db94535d 127
179e29e4
CM		 128 if (alloc_hint == EXTENT_MAP_INLINE)
129 goto out;
130
3b951516 131 BUG_ON(num_bytes > btrfs_super_total_bytes(&root->fs_info->super_copy));
e5a2217e 132 mutex_lock(&BTRFS_I(inode)->extent_mutex);
e6dcd2dc 133 btrfs_drop_extent_cache(inode, start, start + num_bytes - 1);
e5a2217e 134 mutex_unlock(&BTRFS_I(inode)->extent_mutex);
3b951516 135
c59f8951
CM		 136 while(num_bytes > 0) {
137 cur_alloc_size = min(num_bytes, root->fs_info->max_extent);
e6dcd2dc
CM		 138 ret = btrfs_reserve_extent(trans, root, cur_alloc_size,
139 root->sectorsize, 0, 0,
140 (u64)-1, &ins, 1);
c59f8951
CM		 141 if (ret) {
142 WARN_ON(1);
143 goto out;
144 }
e6dcd2dc
CM		 145 em = alloc_extent_map(GFP_NOFS);
146 em->start = start;
147 em->len = ins.offset;
148 em->block_start = ins.objectid;
149 em->bdev = root->fs_info->fs_devices->latest_bdev;
e5a2217e 150 mutex_lock(&BTRFS_I(inode)->extent_mutex);
7f3c74fb 151 set_bit(EXTENT_FLAG_PINNED, &em->flags);
e6dcd2dc
CM		 152 while(1) {
153 spin_lock(&em_tree->lock);
154 ret = add_extent_mapping(em_tree, em);
155 spin_unlock(&em_tree->lock);
156 if (ret != -EEXIST) {
157 free_extent_map(em);
158 break;
159 }
160 btrfs_drop_extent_cache(inode, start,
161 start + ins.offset - 1);
162 }
e5a2217e 163 mutex_unlock(&BTRFS_I(inode)->extent_mutex);
e6dcd2dc 164
98d20f67 165 cur_alloc_size = ins.offset;
e6dcd2dc
CM		 166 ret = btrfs_add_ordered_extent(inode, start, ins.objectid,
167 ins.offset);
168 BUG_ON(ret);
3b951516
CM		 169 if (num_bytes < cur_alloc_size) {
170 printk("num_bytes %Lu cur_alloc %Lu\n", num_bytes,
171 cur_alloc_size);
172 break;
173 }
c59f8951
CM		 174 num_bytes -= cur_alloc_size;
175 alloc_hint = ins.objectid + ins.offset;
176 start += cur_alloc_size;
b888db2b 177 }
b888db2b
CM		 178out:
179 btrfs_end_transaction(trans, root);
be20aa9d
CM		 180 return ret;
181}
182
183static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end)
184{
185 u64 extent_start;
186 u64 extent_end;
187 u64 bytenr;
188 u64 cow_end;
1832a6d5 189 u64 loops = 0;
c31f8830 190 u64 total_fs_bytes;
be20aa9d 191 struct btrfs_root *root = BTRFS_I(inode)->root;
a68d5933 192 struct btrfs_block_group_cache *block_group;
be20aa9d
CM		 193 struct extent_buffer *leaf;
194 int found_type;
195 struct btrfs_path *path;
196 struct btrfs_file_extent_item *item;
197 int ret;
198 int err;
199 struct btrfs_key found_key;
200
c31f8830 201 total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
be20aa9d
CM		 202 path = btrfs_alloc_path();
203 BUG_ON(!path);
204again:
205 ret = btrfs_lookup_file_extent(NULL, root, path,
206 inode->i_ino, start, 0);
207 if (ret < 0) {
208 btrfs_free_path(path);
209 return ret;
210 }
211
212 cow_end = end;
213 if (ret != 0) {
214 if (path->slots[0] == 0)
215 goto not_found;
216 path->slots[0]--;
217 }
218
219 leaf = path->nodes[0];
220 item = btrfs_item_ptr(leaf, path->slots[0],
221 struct btrfs_file_extent_item);
222
223 /* are we inside the extent that was found? */
224 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
225 found_type = btrfs_key_type(&found_key);
226 if (found_key.objectid != inode->i_ino ||
bbaf549e 227 found_type != BTRFS_EXTENT_DATA_KEY)
be20aa9d 228 goto not_found;
be20aa9d
CM		 229
230 found_type = btrfs_file_extent_type(leaf, item);
231 extent_start = found_key.offset;
232 if (found_type == BTRFS_FILE_EXTENT_REG) {
c31f8830
CM		 233 u64 extent_num_bytes;
234
235 extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item);
236 extent_end = extent_start + extent_num_bytes;
be20aa9d
CM		 237 err = 0;
238
1832a6d5
CM		 239 if (loops && start != extent_start)
240 goto not_found;
241
be20aa9d
CM		 242 if (start < extent_start || start >= extent_end)
243 goto not_found;
244
245 cow_end = min(end, extent_end - 1);
246 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
247 if (bytenr == 0)
248 goto not_found;
249
a68d5933
CM		 250 if (btrfs_count_snapshots_in_path(root, path, inode->i_ino,
251 bytenr) != 1) {
252 goto not_found;
253 }
254
c31f8830
CM		 255 /*
256 * we may be called by the resizer, make sure we're inside
257 * the limits of the FS
258 */
a68d5933
CM		 259 block_group = btrfs_lookup_block_group(root->fs_info,
260 bytenr);
261 if (!block_group || block_group->ro)
c31f8830
CM		 262 goto not_found;
263
be20aa9d 264 start = extent_end;
bd09835d 265 } else {
be20aa9d
CM		 266 goto not_found;
267 }
268loop:
269 if (start > end) {
270 btrfs_free_path(path);
271 return 0;
272 }
273 btrfs_release_path(root, path);
1832a6d5 274 loops++;
be20aa9d
CM		 275 goto again;
276
277not_found:
bbaf549e
CM		 278 cow_file_range(inode, start, end);
279 start = end + 1;
be20aa9d
CM		 280 goto loop;
281}
282
283static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
284{
285 struct btrfs_root *root = BTRFS_I(inode)->root;
286 int ret;
a2135011 287
b98b6767
Y		 288 if (btrfs_test_opt(root, NODATACOW) ||
289 btrfs_test_flag(inode, NODATACOW))
be20aa9d
CM		 290 ret = run_delalloc_nocow(inode, start, end);
291 else
292 ret = cow_file_range(inode, start, end);
1832a6d5 293
b888db2b
CM		 294 return ret;
295}
296
291d673e 297int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
b0c68f8b 298 unsigned long old, unsigned long bits)
291d673e 299{
bcbfce8a 300 unsigned long flags;
b0c68f8b 301 if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
291d673e 302 struct btrfs_root *root = BTRFS_I(inode)->root;
bcbfce8a 303 spin_lock_irqsave(&root->fs_info->delalloc_lock, flags);
9069218d 304 BTRFS_I(inode)->delalloc_bytes += end - start + 1;
291d673e 305 root->fs_info->delalloc_bytes += end - start + 1;
bcbfce8a 306 spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags);
291d673e
CM		 307 }
308 return 0;
309}
310
311int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
b0c68f8b 312 unsigned long old, unsigned long bits)
291d673e 313{
b0c68f8b 314 if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
291d673e 315 struct btrfs_root *root = BTRFS_I(inode)->root;
bcbfce8a
CM		 316 unsigned long flags;
317
318 spin_lock_irqsave(&root->fs_info->delalloc_lock, flags);
b0c68f8b
CM		 319 if (end - start + 1 > root->fs_info->delalloc_bytes) {
320 printk("warning: delalloc account %Lu %Lu\n",
321 end - start + 1, root->fs_info->delalloc_bytes);
322 root->fs_info->delalloc_bytes = 0;
9069218d 323 BTRFS_I(inode)->delalloc_bytes = 0;
b0c68f8b
CM		 324 } else {
325 root->fs_info->delalloc_bytes -= end - start + 1;
9069218d 326 BTRFS_I(inode)->delalloc_bytes -= end - start + 1;
b0c68f8b 327 }
bcbfce8a 328 spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags);
291d673e
CM		 329 }
330 return 0;
331}
332
239b14b3
CM		 333int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
334 size_t size, struct bio *bio)
335{
336 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
337 struct btrfs_mapping_tree *map_tree;
239b14b3 338 u64 logical = bio->bi_sector << 9;
239b14b3
CM		 339 u64 length = 0;
340 u64 map_length;
239b14b3
CM		 341 int ret;
342
f2d8d74d 343 length = bio->bi_size;
239b14b3
CM		 344 map_tree = &root->fs_info->mapping_tree;
345 map_length = length;
cea9e445 346 ret = btrfs_map_block(map_tree, READ, logical,
f188591e 347 &map_length, NULL, 0);
cea9e445 348
239b14b3 349 if (map_length < length + size) {
239b14b3
CM		 350 return 1;
351 }
352 return 0;
353}
354
44b8bd7e 355int __btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
f188591e 356 int mirror_num)
065631f6 357{
065631f6 358 struct btrfs_root *root = BTRFS_I(inode)->root;
065631f6 359 int ret = 0;
e015640f 360
3edf7d33 361 ret = btrfs_csum_one_bio(root, inode, bio);
44b8bd7e 362 BUG_ON(ret);
e015640f 363
8b712842 364 return btrfs_map_bio(root, rw, bio, mirror_num, 1);
44b8bd7e
CM		 365}
366
367int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
368 int mirror_num)
369{
370 struct btrfs_root *root = BTRFS_I(inode)->root;
371 int ret = 0;
372
e6dcd2dc
CM		 373 ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
374 BUG_ON(ret);
065631f6 375
e6dcd2dc 376 if (!(rw & (1 << BIO_RW))) {
0b86a832
CM		 377 goto mapit;
378 }
065631f6 379
44b8bd7e
CM		 380 return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
381 inode, rw, bio, mirror_num,
382 __btrfs_submit_bio_hook);
0b86a832 383mapit:
8b712842 384 return btrfs_map_bio(root, rw, bio, mirror_num, 0);
065631f6 385}
6885f308 386
ba1da2f4 387static noinline int add_pending_csums(struct btrfs_trans_handle *trans,
e6dcd2dc
CM		 388 struct inode *inode, u64 file_offset,
389 struct list_head *list)
390{
391 struct list_head *cur;
392 struct btrfs_ordered_sum *sum;
393
394 btrfs_set_trans_block_group(trans, inode);
ba1da2f4 395 list_for_each(cur, list) {
e6dcd2dc
CM		 396 sum = list_entry(cur, struct btrfs_ordered_sum, list);
397 mutex_lock(&BTRFS_I(inode)->csum_mutex);
398 btrfs_csum_file_blocks(trans, BTRFS_I(inode)->root,
399 inode, sum);
400 mutex_unlock(&BTRFS_I(inode)->csum_mutex);
e6dcd2dc
CM		 401 }
402 return 0;
403}
404
247e743c
CM		 405struct btrfs_writepage_fixup {
406 struct page *page;
407 struct btrfs_work work;
408};
409
410/* see btrfs_writepage_start_hook for details on why this is required */
411void btrfs_writepage_fixup_worker(struct btrfs_work *work)
412{
413 struct btrfs_writepage_fixup *fixup;
414 struct btrfs_ordered_extent *ordered;
415 struct page *page;
416 struct inode *inode;
417 u64 page_start;
418 u64 page_end;
419
420 fixup = container_of(work, struct btrfs_writepage_fixup, work);
421 page = fixup->page;
4a096752 422again:
247e743c
CM		 423 lock_page(page);
424 if (!page->mapping || !PageDirty(page) || !PageChecked(page)) {
425 ClearPageChecked(page);
426 goto out_page;
427 }
428
429 inode = page->mapping->host;
430 page_start = page_offset(page);
431 page_end = page_offset(page) + PAGE_CACHE_SIZE - 1;
432
433 lock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end, GFP_NOFS);
4a096752
CM		 434
435 /* already ordered? We're done */
436 if (test_range_bit(&BTRFS_I(inode)->io_tree, page_start, page_end,
437 EXTENT_ORDERED, 0)) {
247e743c 438 goto out;
4a096752
CM		 439 }
440
441 ordered = btrfs_lookup_ordered_extent(inode, page_start);
442 if (ordered) {
443 unlock_extent(&BTRFS_I(inode)->io_tree, page_start,
444 page_end, GFP_NOFS);
445 unlock_page(page);
446 btrfs_start_ordered_extent(inode, ordered, 1);
447 goto again;
448 }
247e743c
CM		 449
450 set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start, page_end,
451 GFP_NOFS);
452 ClearPageChecked(page);
453out:
454 unlock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end, GFP_NOFS);
455out_page:
456 unlock_page(page);
457 page_cache_release(page);
458}
459
460/*
461 * There are a few paths in the higher layers of the kernel that directly
462 * set the page dirty bit without asking the filesystem if it is a
463 * good idea. This causes problems because we want to make sure COW
464 * properly happens and the data=ordered rules are followed.
465 *
466 * In our case any range that doesn't have the EXTENT_ORDERED bit set
467 * hasn't been properly setup for IO. We kick off an async process
468 * to fix it up. The async helper will wait for ordered extents, set
469 * the delalloc bit and make it safe to write the page.
470 */
471int btrfs_writepage_start_hook(struct page *page, u64 start, u64 end)
472{
473 struct inode *inode = page->mapping->host;
474 struct btrfs_writepage_fixup *fixup;
475 struct btrfs_root *root = BTRFS_I(inode)->root;
476 int ret;
477
478 ret = test_range_bit(&BTRFS_I(inode)->io_tree, start, end,
479 EXTENT_ORDERED, 0);
480 if (ret)
481 return 0;
482
483 if (PageChecked(page))
484 return -EAGAIN;
485
486 fixup = kzalloc(sizeof(*fixup), GFP_NOFS);
487 if (!fixup)
488 return -EAGAIN;
f421950f 489
247e743c
CM		 490 SetPageChecked(page);
491 page_cache_get(page);
492 fixup->work.func = btrfs_writepage_fixup_worker;
493 fixup->page = page;
494 btrfs_queue_worker(&root->fs_info->fixup_workers, &fixup->work);
495 return -EAGAIN;
496}
497
211f90e6 498static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end)
e6dcd2dc 499{
e6dcd2dc
CM		 500 struct btrfs_root *root = BTRFS_I(inode)->root;
501 struct btrfs_trans_handle *trans;
502 struct btrfs_ordered_extent *ordered_extent;
503 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
7f3c74fb
CM		 504 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
505 struct extent_map *em;
f421950f 506 struct extent_map *em_orig;
e6dcd2dc 507 u64 alloc_hint = 0;
e5a2217e
CM		 508 u64 clear_start;
509 u64 clear_end;
e6dcd2dc
CM		 510 struct list_head list;
511 struct btrfs_key ins;
f421950f 512 struct rb_node *rb;
e6dcd2dc
CM		 513 int ret;
514
515 ret = btrfs_dec_test_ordered_pending(inode, start, end - start + 1);
ba1da2f4 516 if (!ret)
e6dcd2dc 517 return 0;
e6dcd2dc 518
f9295749 519 trans = btrfs_join_transaction(root, 1);
e6dcd2dc
CM		 520
521 ordered_extent = btrfs_lookup_ordered_extent(inode, start);
522 BUG_ON(!ordered_extent);
523
524 lock_extent(io_tree, ordered_extent->file_offset,
525 ordered_extent->file_offset + ordered_extent->len - 1,
526 GFP_NOFS);
527
528 INIT_LIST_HEAD(&list);
529
530 ins.objectid = ordered_extent->start;
531 ins.offset = ordered_extent->len;
532 ins.type = BTRFS_EXTENT_ITEM_KEY;
e5a2217e 533
e6dcd2dc
CM		 534 ret = btrfs_alloc_reserved_extent(trans, root, root->root_key.objectid,
535 trans->transid, inode->i_ino,
536 ordered_extent->file_offset, &ins);
537 BUG_ON(ret);
ee6e6504
CM		 538
539 mutex_lock(&BTRFS_I(inode)->extent_mutex);
e5a2217e 540
f421950f
CM		 541 spin_lock(&em_tree->lock);
542 clear_start = ordered_extent->file_offset;
543 clear_end = ordered_extent->file_offset + ordered_extent->len;
544 em = lookup_extent_mapping(em_tree, clear_start,
545 ordered_extent->len);
546 em_orig = em;
547 while(em && clear_start < extent_map_end(em) && clear_end > em->start) {
548 clear_bit(EXTENT_FLAG_PINNED, &em->flags);
549 rb = rb_next(&em->rb_node);
550 if (!rb)
551 break;
552 em = rb_entry(rb, struct extent_map, rb_node);
553 }
554 free_extent_map(em_orig);
555 spin_unlock(&em_tree->lock);
556
e6dcd2dc
CM		 557 ret = btrfs_drop_extents(trans, root, inode,
558 ordered_extent->file_offset,
559 ordered_extent->file_offset +
560 ordered_extent->len,
561 ordered_extent->file_offset, &alloc_hint);
562 BUG_ON(ret);
563 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
564 ordered_extent->file_offset,
565 ordered_extent->start,
566 ordered_extent->len,
567 ordered_extent->len, 0);
568 BUG_ON(ret);
7f3c74fb 569
e6dcd2dc
CM		 570 btrfs_drop_extent_cache(inode, ordered_extent->file_offset,
571 ordered_extent->file_offset +
572 ordered_extent->len - 1);
ee6e6504
CM		 573 mutex_unlock(&BTRFS_I(inode)->extent_mutex);
574
e6dcd2dc
CM		 575 inode->i_blocks += ordered_extent->len >> 9;
576 unlock_extent(io_tree, ordered_extent->file_offset,
577 ordered_extent->file_offset + ordered_extent->len - 1,
578 GFP_NOFS);
579 add_pending_csums(trans, inode, ordered_extent->file_offset,
580 &ordered_extent->list);
581
dbe674a9 582 btrfs_ordered_update_i_size(inode, ordered_extent);
e6dcd2dc 583 btrfs_remove_ordered_extent(inode, ordered_extent);
7f3c74fb 584
e6dcd2dc
CM		 585 /* once for us */
586 btrfs_put_ordered_extent(ordered_extent);
587 /* once for the tree */
588 btrfs_put_ordered_extent(ordered_extent);
589
590 btrfs_update_inode(trans, root, inode);
591 btrfs_end_transaction(trans, root);
592 return 0;
593}
594
211f90e6
CM		 595int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end,
596 struct extent_state *state, int uptodate)
597{
598 return btrfs_finish_ordered_io(page->mapping->host, start, end);
599}
600
07157aac
CM		 601int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
602{
603 int ret = 0;
604 struct inode *inode = page->mapping->host;
605 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 606 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
07157aac
CM		 607 struct btrfs_csum_item *item;
608 struct btrfs_path *path = NULL;
ff79f819 609 u32 csum;
699122f5 610
b98b6767
Y		 611 if (btrfs_test_opt(root, NODATASUM) ||
612 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 613 return 0;
699122f5 614
89642229
CM		 615 /*
616 * It is possible there is an ordered extent that has
617 * not yet finished for this range in the file. If so,
618 * that extent will have a csum cached, and it will insert
619 * the sum after all the blocks in the extent are fully
620 * on disk. So, look for an ordered extent and use the
621 * sum if found. We have to do this before looking in the
622 * btree because csum items are pre-inserted based on
623 * the file size. btrfs_lookup_csum might find an item
624 * that still hasn't been fully filled.
625 */
626 ret = btrfs_find_ordered_sum(inode, start, &csum);
627 if (ret == 0)
628 goto found;
629
630 ret = 0;
07157aac
CM		 631 path = btrfs_alloc_path();
632 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
633 if (IS_ERR(item)) {
634 ret = PTR_ERR(item);
635 /* a csum that isn't present is a preallocated region. */
636 if (ret == -ENOENT || ret == -EFBIG)
637 ret = 0;
ff79f819 638 csum = 0;
e6dcd2dc
CM		 639 printk("no csum found for inode %lu start %Lu\n", inode->i_ino,
640 start);
07157aac
CM		 641 goto out;
642 }
ff79f819
CM		 643 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
644 BTRFS_CRC32_SIZE);
ba1da2f4 645found:
d1310b2e 646 set_state_private(io_tree, start, csum);
07157aac
CM		 647out:
648 if (path)
649 btrfs_free_path(path);
07157aac
CM		 650 return ret;
651}
652
7e38326f
CM		 653struct io_failure_record {
654 struct page *page;
655 u64 start;
656 u64 len;
657 u64 logical;
658 int last_mirror;
659};
660
1259ab75
CM		 661int btrfs_io_failed_hook(struct bio *failed_bio,
662 struct page *page, u64 start, u64 end,
663 struct extent_state *state)
7e38326f
CM		 664{
665 struct io_failure_record *failrec = NULL;
666 u64 private;
667 struct extent_map *em;
668 struct inode *inode = page->mapping->host;
669 struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree;
3b951516 670 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
7e38326f
CM		 671 struct bio *bio;
672 int num_copies;
673 int ret;
1259ab75 674 int rw;
7e38326f
CM		 675 u64 logical;
676
677 ret = get_state_private(failure_tree, start, &private);
678 if (ret) {
7e38326f
CM		 679 failrec = kmalloc(sizeof(*failrec), GFP_NOFS);
680 if (!failrec)
681 return -ENOMEM;
682 failrec->start = start;
683 failrec->len = end - start + 1;
684 failrec->last_mirror = 0;
685
3b951516
CM		 686 spin_lock(&em_tree->lock);
687 em = lookup_extent_mapping(em_tree, start, failrec->len);
688 if (em->start > start || em->start + em->len < start) {
689 free_extent_map(em);
690 em = NULL;
691 }
692 spin_unlock(&em_tree->lock);
7e38326f
CM		 693
694 if (!em || IS_ERR(em)) {
695 kfree(failrec);
696 return -EIO;
697 }
698 logical = start - em->start;
699 logical = em->block_start + logical;
700 failrec->logical = logical;
701 free_extent_map(em);
702 set_extent_bits(failure_tree, start, end, EXTENT_LOCKED |
703 EXTENT_DIRTY, GFP_NOFS);
587f7704
CM		 704 set_state_private(failure_tree, start,
705 (u64)(unsigned long)failrec);
7e38326f 706 } else {
587f7704 707 failrec = (struct io_failure_record *)(unsigned long)private;
7e38326f
CM		 708 }
709 num_copies = btrfs_num_copies(
710 &BTRFS_I(inode)->root->fs_info->mapping_tree,
711 failrec->logical, failrec->len);
712 failrec->last_mirror++;
713 if (!state) {
714 spin_lock_irq(&BTRFS_I(inode)->io_tree.lock);
715 state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree,
716 failrec->start,
717 EXTENT_LOCKED);
718 if (state && state->start != failrec->start)
719 state = NULL;
720 spin_unlock_irq(&BTRFS_I(inode)->io_tree.lock);
721 }
722 if (!state || failrec->last_mirror > num_copies) {
723 set_state_private(failure_tree, failrec->start, 0);
724 clear_extent_bits(failure_tree, failrec->start,
725 failrec->start + failrec->len - 1,
726 EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS);
727 kfree(failrec);
728 return -EIO;
729 }
730 bio = bio_alloc(GFP_NOFS, 1);
731 bio->bi_private = state;
732 bio->bi_end_io = failed_bio->bi_end_io;
733 bio->bi_sector = failrec->logical >> 9;
734 bio->bi_bdev = failed_bio->bi_bdev;
e1c4b745 735 bio->bi_size = 0;
7e38326f 736 bio_add_page(bio, page, failrec->len, start - page_offset(page));
1259ab75
CM		 737 if (failed_bio->bi_rw & (1 << BIO_RW))
738 rw = WRITE;
739 else
740 rw = READ;
741
742 BTRFS_I(inode)->io_tree.ops->submit_bio_hook(inode, rw, bio,
743 failrec->last_mirror);
744 return 0;
745}
746
747int btrfs_clean_io_failures(struct inode *inode, u64 start)
748{
749 u64 private;
750 u64 private_failure;
751 struct io_failure_record *failure;
752 int ret;
753
754 private = 0;
755 if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private,
756 (u64)-1, 1, EXTENT_DIRTY)) {
757 ret = get_state_private(&BTRFS_I(inode)->io_failure_tree,
758 start, &private_failure);
759 if (ret == 0) {
760 failure = (struct io_failure_record *)(unsigned long)
761 private_failure;
762 set_state_private(&BTRFS_I(inode)->io_failure_tree,
763 failure->start, 0);
764 clear_extent_bits(&BTRFS_I(inode)->io_failure_tree,
765 failure->start,
766 failure->start + failure->len - 1,
767 EXTENT_DIRTY | EXTENT_LOCKED,
768 GFP_NOFS);
769 kfree(failure);
770 }
771 }
7e38326f
CM		 772 return 0;
773}
774
70dec807
CM		 775int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
776 struct extent_state *state)
07157aac 777{
35ebb934 778 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
07157aac 779 struct inode *inode = page->mapping->host;
d1310b2e 780 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
07157aac 781 char *kaddr;
aadfeb6e 782 u64 private = ~(u32)0;
07157aac 783 int ret;
ff79f819
CM		 784 struct btrfs_root *root = BTRFS_I(inode)->root;
785 u32 csum = ~(u32)0;
bbf0d006 786 unsigned long flags;
d1310b2e 787
b98b6767
Y		 788 if (btrfs_test_opt(root, NODATASUM) ||
789 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 790 return 0;
c2e639f0 791 if (state && state->start == start) {
70dec807
CM		 792 private = state->private;
793 ret = 0;
794 } else {
795 ret = get_state_private(io_tree, start, &private);
796 }
bbf0d006 797 local_irq_save(flags);
07157aac
CM		 798 kaddr = kmap_atomic(page, KM_IRQ0);
799 if (ret) {
800 goto zeroit;
801 }
ff79f819
CM		 802 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
803 btrfs_csum_final(csum, (char *)&csum);
804 if (csum != private) {
07157aac
CM		 805 goto zeroit;
806 }
807 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 808 local_irq_restore(flags);
7e38326f
CM		 809
810 /* if the io failure tree for this inode is non-empty,
811 * check to see if we've recovered from a failed IO
812 */
1259ab75 813 btrfs_clean_io_failures(inode, start);
07157aac
CM		 814 return 0;
815
816zeroit:
aadfeb6e
CM		 817 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
818 page->mapping->host->i_ino, (unsigned long long)start, csum,
819 private);
db94535d
CM		 820 memset(kaddr + offset, 1, end - start + 1);
821 flush_dcache_page(page);
07157aac 822 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 823 local_irq_restore(flags);
3b951516
CM		 824 if (private == 0)
825 return 0;
7e38326f 826 return -EIO;
07157aac 827}
b888db2b 828
39279cc3
CM		 829void btrfs_read_locked_inode(struct inode *inode)
830{
831 struct btrfs_path *path;
5f39d397 832 struct extent_buffer *leaf;
39279cc3 833 struct btrfs_inode_item *inode_item;
0b86a832 834 struct btrfs_timespec *tspec;
39279cc3
CM		 835 struct btrfs_root *root = BTRFS_I(inode)->root;
836 struct btrfs_key location;
837 u64 alloc_group_block;
618e21d5 838 u32 rdev;
39279cc3
CM		 839 int ret;
840
841 path = btrfs_alloc_path();
842 BUG_ON(!path);
39279cc3 843 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
dc17ff8f 844
39279cc3 845 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
5f39d397 846 if (ret)
39279cc3 847 goto make_bad;
39279cc3 848
5f39d397
CM		 849 leaf = path->nodes[0];
850 inode_item = btrfs_item_ptr(leaf, path->slots[0],
851 struct btrfs_inode_item);
852
853 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
854 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
855 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
856 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
dbe674a9 857 btrfs_i_size_write(inode, btrfs_inode_size(leaf, inode_item));
5f39d397
CM		 858
859 tspec = btrfs_inode_atime(inode_item);
860 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
861 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
862
863 tspec = btrfs_inode_mtime(inode_item);
864 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
865 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
866
867 tspec = btrfs_inode_ctime(inode_item);
868 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
869 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
870
871 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
872 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
618e21d5 873 inode->i_rdev = 0;
5f39d397
CM		 874 rdev = btrfs_inode_rdev(leaf, inode_item);
875
aec7477b
JB		 876 BTRFS_I(inode)->index_cnt = (u64)-1;
877
5f39d397 878 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
39279cc3
CM		 879 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
880 alloc_group_block);
b98b6767 881 BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
e52ec0eb
CM		 882 if (!BTRFS_I(inode)->block_group) {
883 BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
0b86a832
CM		 884 NULL, 0,
885 BTRFS_BLOCK_GROUP_METADATA, 0);
e52ec0eb 886 }
39279cc3
CM		 887 btrfs_free_path(path);
888 inode_item = NULL;
889
39279cc3 890 switch (inode->i_mode & S_IFMT) {
39279cc3
CM		 891 case S_IFREG:
892 inode->i_mapping->a_ops = &btrfs_aops;
04160088 893 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
d1310b2e 894 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 895 inode->i_fop = &btrfs_file_operations;
896 inode->i_op = &btrfs_file_inode_operations;
897 break;
898 case S_IFDIR:
899 inode->i_fop = &btrfs_dir_file_operations;
900 if (root == root->fs_info->tree_root)
901 inode->i_op = &btrfs_dir_ro_inode_operations;
902 else
903 inode->i_op = &btrfs_dir_inode_operations;
904 break;
905 case S_IFLNK:
906 inode->i_op = &btrfs_symlink_inode_operations;
907 inode->i_mapping->a_ops = &btrfs_symlink_aops;
04160088 908 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3 909 break;
618e21d5
JB		 910 default:
911 init_special_inode(inode, inode->i_mode, rdev);
912 break;
39279cc3
CM		 913 }
914 return;
915
916make_bad:
39279cc3 917 btrfs_free_path(path);
39279cc3
CM		 918 make_bad_inode(inode);
919}
920
5f39d397
CM		 921static void fill_inode_item(struct extent_buffer *leaf,
922 struct btrfs_inode_item *item,
39279cc3
CM		 923 struct inode *inode)
924{
5f39d397
CM		 925 btrfs_set_inode_uid(leaf, item, inode->i_uid);
926 btrfs_set_inode_gid(leaf, item, inode->i_gid);
dbe674a9 927 btrfs_set_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size);
5f39d397
CM		 928 btrfs_set_inode_mode(leaf, item, inode->i_mode);
929 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
930
931 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
932 inode->i_atime.tv_sec);
933 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
934 inode->i_atime.tv_nsec);
935
936 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
937 inode->i_mtime.tv_sec);
938 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
939 inode->i_mtime.tv_nsec);
940
941 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
942 inode->i_ctime.tv_sec);
943 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
944 inode->i_ctime.tv_nsec);
945
946 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
947 btrfs_set_inode_generation(leaf, item, inode->i_generation);
948 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
b98b6767 949 btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
5f39d397 950 btrfs_set_inode_block_group(leaf, item,
39279cc3
CM		 951 BTRFS_I(inode)->block_group->key.objectid);
952}
953
ba1da2f4 954int noinline btrfs_update_inode(struct btrfs_trans_handle *trans,
39279cc3
CM		 955 struct btrfs_root *root,
956 struct inode *inode)
957{
958 struct btrfs_inode_item *inode_item;
959 struct btrfs_path *path;
5f39d397 960 struct extent_buffer *leaf;
39279cc3
CM		 961 int ret;
962
963 path = btrfs_alloc_path();
964 BUG_ON(!path);
39279cc3
CM		 965 ret = btrfs_lookup_inode(trans, root, path,
966 &BTRFS_I(inode)->location, 1);
967 if (ret) {
968 if (ret > 0)
969 ret = -ENOENT;
970 goto failed;
971 }
972
5f39d397
CM		 973 leaf = path->nodes[0];
974 inode_item = btrfs_item_ptr(leaf, path->slots[0],
39279cc3
CM		 975 struct btrfs_inode_item);
976
5f39d397
CM		 977 fill_inode_item(leaf, inode_item, inode);
978 btrfs_mark_buffer_dirty(leaf);
15ee9bc7 979 btrfs_set_inode_last_trans(trans, inode);
39279cc3
CM		 980 ret = 0;
981failed:
39279cc3
CM		 982 btrfs_free_path(path);
983 return ret;
984}
985
986
987static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
988 struct btrfs_root *root,
989 struct inode *dir,
990 struct dentry *dentry)
991{
992 struct btrfs_path *path;
993 const char *name = dentry->d_name.name;
994 int name_len = dentry->d_name.len;
995 int ret = 0;
5f39d397 996 struct extent_buffer *leaf;
39279cc3 997 struct btrfs_dir_item *di;
5f39d397 998 struct btrfs_key key;
aec7477b 999 u64 index;
39279cc3
CM		 1000
1001 path = btrfs_alloc_path();
54aa1f4d
CM		 1002 if (!path) {
1003 ret = -ENOMEM;
1004 goto err;
1005 }
1006
39279cc3
CM		 1007 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
1008 name, name_len, -1);
1009 if (IS_ERR(di)) {
1010 ret = PTR_ERR(di);
1011 goto err;
1012 }
1013 if (!di) {
1014 ret = -ENOENT;
1015 goto err;
1016 }
5f39d397
CM		 1017 leaf = path->nodes[0];
1018 btrfs_dir_item_key_to_cpu(leaf, di, &key);
39279cc3 1019 ret = btrfs_delete_one_dir_name(trans, root, path, di);
54aa1f4d
CM		 1020 if (ret)
1021 goto err;
39279cc3
CM		 1022 btrfs_release_path(root, path);
1023
aec7477b
JB		 1024 ret = btrfs_del_inode_ref(trans, root, name, name_len,
1025 dentry->d_inode->i_ino,
1026 dentry->d_parent->d_inode->i_ino, &index);
1027 if (ret) {
1028 printk("failed to delete reference to %.*s, "
1029 "inode %lu parent %lu\n", name_len, name,
1030 dentry->d_inode->i_ino,
1031 dentry->d_parent->d_inode->i_ino);
1032 goto err;
1033 }
1034
39279cc3 1035 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
aec7477b 1036 index, name, name_len, -1);
39279cc3
CM		 1037 if (IS_ERR(di)) {
1038 ret = PTR_ERR(di);
1039 goto err;
1040 }
1041 if (!di) {
1042 ret = -ENOENT;
1043 goto err;
1044 }
1045 ret = btrfs_delete_one_dir_name(trans, root, path, di);
925baedd 1046 btrfs_release_path(root, path);
39279cc3
CM		 1047
1048 dentry->d_inode->i_ctime = dir->i_ctime;
1049err:
1050 btrfs_free_path(path);
1051 if (!ret) {
dbe674a9 1052 btrfs_i_size_write(dir, dir->i_size - name_len * 2);
79c44584 1053 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
39279cc3 1054 btrfs_update_inode(trans, root, dir);
6da6abae
CM		 1055#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1056 dentry->d_inode->i_nlink--;
1057#else
39279cc3 1058 drop_nlink(dentry->d_inode);
6da6abae 1059#endif
54aa1f4d 1060 ret = btrfs_update_inode(trans, root, dentry->d_inode);
39279cc3
CM		 1061 dir->i_sb->s_dirt = 1;
1062 }
1063 return ret;
1064}
1065
1066static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
1067{
1068 struct btrfs_root *root;
1069 struct btrfs_trans_handle *trans;
1070 int ret;
1832a6d5 1071 unsigned long nr = 0;
39279cc3
CM		 1072
1073 root = BTRFS_I(dir)->root;
1832a6d5
CM		 1074
1075 ret = btrfs_check_free_space(root, 1, 1);
1076 if (ret)
1077 goto fail;
1078
39279cc3 1079 trans = btrfs_start_transaction(root, 1);
5f39d397 1080
39279cc3
CM		 1081 btrfs_set_trans_block_group(trans, dir);
1082 ret = btrfs_unlink_trans(trans, root, dir, dentry);
d3c2fdcf 1083 nr = trans->blocks_used;
5f39d397 1084
89ce8a63 1085 btrfs_end_transaction_throttle(trans, root);
1832a6d5 1086fail:
d3c2fdcf 1087 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 1088 return ret;
1089}
1090
1091static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
1092{
1093 struct inode *inode = dentry->d_inode;
1832a6d5 1094 int err = 0;
39279cc3
CM		 1095 int ret;
1096 struct btrfs_root *root = BTRFS_I(dir)->root;
39279cc3 1097 struct btrfs_trans_handle *trans;
1832a6d5 1098 unsigned long nr = 0;
39279cc3 1099
925baedd 1100 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
134d4512 1101 return -ENOTEMPTY;
925baedd 1102 }
134d4512 1103
1832a6d5
CM		 1104 ret = btrfs_check_free_space(root, 1, 1);
1105 if (ret)
1106 goto fail;
1107
39279cc3
CM		 1108 trans = btrfs_start_transaction(root, 1);
1109 btrfs_set_trans_block_group(trans, dir);
39279cc3
CM		 1110
1111 /* now the directory is empty */
1112 err = btrfs_unlink_trans(trans, root, dir, dentry);
1113 if (!err) {
dbe674a9 1114 btrfs_i_size_write(inode, 0);
39279cc3 1115 }
3954401f 1116
d3c2fdcf 1117 nr = trans->blocks_used;
89ce8a63 1118 ret = btrfs_end_transaction_throttle(trans, root);
1832a6d5 1119fail:
d3c2fdcf 1120 btrfs_btree_balance_dirty(root, nr);
3954401f 1121
39279cc3
CM		 1122 if (ret && !err)
1123 err = ret;
1124 return err;
1125}
1126
39279cc3
CM		 1127/*
1128 * this can truncate away extent items, csum items and directory items.
1129 * It starts at a high offset and removes keys until it can't find
1130 * any higher than i_size.
1131 *
1132 * csum items that cross the new i_size are truncated to the new size
1133 * as well.
1134 */
1135static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
1136 struct btrfs_root *root,
85e21bac
CM		 1137 struct inode *inode,
1138 u32 min_type)
39279cc3
CM		 1139{
1140 int ret;
1141 struct btrfs_path *path;
1142 struct btrfs_key key;
5f39d397 1143 struct btrfs_key found_key;
39279cc3 1144 u32 found_type;
5f39d397 1145 struct extent_buffer *leaf;
39279cc3
CM		 1146 struct btrfs_file_extent_item *fi;
1147 u64 extent_start = 0;
db94535d 1148 u64 extent_num_bytes = 0;
39279cc3 1149 u64 item_end = 0;
7bb86316 1150 u64 root_gen = 0;
d8d5f3e1 1151 u64 root_owner = 0;
39279cc3
CM		 1152 int found_extent;
1153 int del_item;
85e21bac
CM		 1154 int pending_del_nr = 0;
1155 int pending_del_slot = 0;
179e29e4 1156 int extent_type = -1;
3b951516 1157 u64 mask = root->sectorsize - 1;
39279cc3 1158
3b951516 1159 btrfs_drop_extent_cache(inode, inode->i_size & (~mask), (u64)-1);
39279cc3 1160 path = btrfs_alloc_path();
3c69faec 1161 path->reada = -1;
39279cc3 1162 BUG_ON(!path);
5f39d397 1163
39279cc3
CM		 1164 /* FIXME, add redo link to tree so we don't leak on crash */
1165 key.objectid = inode->i_ino;
1166 key.offset = (u64)-1;
5f39d397
CM		 1167 key.type = (u8)-1;
1168
85e21bac
CM		 1169 btrfs_init_path(path);
1170search_again:
1171 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
1172 if (ret < 0) {
1173 goto error;
1174 }
1175 if (ret > 0) {
1176 BUG_ON(path->slots[0] == 0);
1177 path->slots[0]--;
1178 }
1179
39279cc3 1180 while(1) {
39279cc3 1181 fi = NULL;
5f39d397
CM		 1182 leaf = path->nodes[0];
1183 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1184 found_type = btrfs_key_type(&found_key);
39279cc3 1185
5f39d397 1186 if (found_key.objectid != inode->i_ino)
39279cc3 1187 break;
5f39d397 1188
85e21bac 1189 if (found_type < min_type)
39279cc3
CM		 1190 break;
1191
5f39d397 1192 item_end = found_key.offset;
39279cc3 1193 if (found_type == BTRFS_EXTENT_DATA_KEY) {
5f39d397 1194 fi = btrfs_item_ptr(leaf, path->slots[0],
39279cc3 1195 struct btrfs_file_extent_item);
179e29e4
CM		 1196 extent_type = btrfs_file_extent_type(leaf, fi);
1197 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
5f39d397 1198 item_end +=
db94535d 1199 btrfs_file_extent_num_bytes(leaf, fi);
179e29e4
CM		 1200 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
1201 struct btrfs_item *item = btrfs_item_nr(leaf,
1202 path->slots[0]);
1203 item_end += btrfs_file_extent_inline_len(leaf,
1204 item);
39279cc3 1205 }
008630c1 1206 item_end--;
39279cc3
CM		 1207 }
1208 if (found_type == BTRFS_CSUM_ITEM_KEY) {
1209 ret = btrfs_csum_truncate(trans, root, path,
1210 inode->i_size);
1211 BUG_ON(ret);
1212 }
008630c1 1213 if (item_end < inode->i_size) {
b888db2b
CM		 1214 if (found_type == BTRFS_DIR_ITEM_KEY) {
1215 found_type = BTRFS_INODE_ITEM_KEY;
1216 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
1217 found_type = BTRFS_CSUM_ITEM_KEY;
85e21bac
CM		 1218 } else if (found_type == BTRFS_EXTENT_DATA_KEY) {
1219 found_type = BTRFS_XATTR_ITEM_KEY;
1220 } else if (found_type == BTRFS_XATTR_ITEM_KEY) {
1221 found_type = BTRFS_INODE_REF_KEY;
b888db2b
CM		 1222 } else if (found_type) {
1223 found_type--;
1224 } else {
1225 break;
39279cc3 1226 }
a61721d5 1227 btrfs_set_key_type(&key, found_type);
85e21bac 1228 goto next;
39279cc3 1229 }
5f39d397 1230 if (found_key.offset >= inode->i_size)
39279cc3
CM		 1231 del_item = 1;
1232 else
1233 del_item = 0;
1234 found_extent = 0;
1235
1236 /* FIXME, shrink the extent if the ref count is only 1 */
179e29e4
CM		 1237 if (found_type != BTRFS_EXTENT_DATA_KEY)
1238 goto delete;
1239
1240 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
39279cc3 1241 u64 num_dec;
db94535d 1242 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
39279cc3 1243 if (!del_item) {
db94535d
CM		 1244 u64 orig_num_bytes =
1245 btrfs_file_extent_num_bytes(leaf, fi);
1246 extent_num_bytes = inode->i_size -
5f39d397 1247 found_key.offset + root->sectorsize - 1;
b1632b10
Y		 1248 extent_num_bytes = extent_num_bytes &
1249 ~((u64)root->sectorsize - 1);
db94535d
CM		 1250 btrfs_set_file_extent_num_bytes(leaf, fi,
1251 extent_num_bytes);
1252 num_dec = (orig_num_bytes -
9069218d
CM		 1253 extent_num_bytes);
1254 if (extent_start != 0)
1255 dec_i_blocks(inode, num_dec);
5f39d397 1256 btrfs_mark_buffer_dirty(leaf);
39279cc3 1257 } else {
db94535d
CM		 1258 extent_num_bytes =
1259 btrfs_file_extent_disk_num_bytes(leaf,
1260 fi);
39279cc3 1261 /* FIXME blocksize != 4096 */
9069218d 1262 num_dec = btrfs_file_extent_num_bytes(leaf, fi);
39279cc3
CM		 1263 if (extent_start != 0) {
1264 found_extent = 1;
9069218d 1265 dec_i_blocks(inode, num_dec);
39279cc3 1266 }
d8d5f3e1
CM		 1267 root_gen = btrfs_header_generation(leaf);
1268 root_owner = btrfs_header_owner(leaf);
39279cc3 1269 }
9069218d
CM		 1270 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
1271 if (!del_item) {
1272 u32 newsize = inode->i_size - found_key.offset;
1273 dec_i_blocks(inode, item_end + 1 -
1274 found_key.offset - newsize);
1275 newsize =
1276 btrfs_file_extent_calc_inline_size(newsize);
1277 ret = btrfs_truncate_item(trans, root, path,
1278 newsize, 1);
1279 BUG_ON(ret);
1280 } else {
1281 dec_i_blocks(inode, item_end + 1 -
1282 found_key.offset);
1283 }
39279cc3 1284 }
179e29e4 1285delete:
39279cc3 1286 if (del_item) {
85e21bac
CM		 1287 if (!pending_del_nr) {
1288 /* no pending yet, add ourselves */
1289 pending_del_slot = path->slots[0];
1290 pending_del_nr = 1;
1291 } else if (pending_del_nr &&
1292 path->slots[0] + 1 == pending_del_slot) {
1293 /* hop on the pending chunk */
1294 pending_del_nr++;
1295 pending_del_slot = path->slots[0];
1296 } else {
1297 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot);
1298 }
39279cc3
CM		 1299 } else {
1300 break;
1301 }
39279cc3
CM		 1302 if (found_extent) {
1303 ret = btrfs_free_extent(trans, root, extent_start,
7bb86316 1304 extent_num_bytes,
d8d5f3e1 1305 root_owner,
7bb86316
CM		 1306 root_gen, inode->i_ino,
1307 found_key.offset, 0);
39279cc3
CM		 1308 BUG_ON(ret);
1309 }
85e21bac
CM		 1310next:
1311 if (path->slots[0] == 0) {
1312 if (pending_del_nr)
1313 goto del_pending;
1314 btrfs_release_path(root, path);
1315 goto search_again;
1316 }
1317
1318 path->slots[0]--;
1319 if (pending_del_nr &&
1320 path->slots[0] + 1 != pending_del_slot) {
1321 struct btrfs_key debug;
1322del_pending:
1323 btrfs_item_key_to_cpu(path->nodes[0], &debug,
1324 pending_del_slot);
1325 ret = btrfs_del_items(trans, root, path,
1326 pending_del_slot,
1327 pending_del_nr);
1328 BUG_ON(ret);
1329 pending_del_nr = 0;
1330 btrfs_release_path(root, path);
1331 goto search_again;
1332 }
39279cc3
CM		 1333 }
1334 ret = 0;
1335error:
85e21bac
CM		 1336 if (pending_del_nr) {
1337 ret = btrfs_del_items(trans, root, path, pending_del_slot,
1338 pending_del_nr);
1339 }
39279cc3
CM		 1340 btrfs_free_path(path);
1341 inode->i_sb->s_dirt = 1;
1342 return ret;
1343}
1344
1345/*
1346 * taken from block_truncate_page, but does cow as it zeros out
1347 * any bytes left in the last page in the file.
1348 */
1349static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
1350{
1351 struct inode *inode = mapping->host;
db94535d 1352 struct btrfs_root *root = BTRFS_I(inode)->root;
e6dcd2dc
CM		 1353 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1354 struct btrfs_ordered_extent *ordered;
1355 char *kaddr;
db94535d 1356 u32 blocksize = root->sectorsize;
39279cc3
CM		 1357 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1358 unsigned offset = from & (PAGE_CACHE_SIZE-1);
1359 struct page *page;
39279cc3 1360 int ret = 0;
a52d9a80 1361 u64 page_start;
e6dcd2dc 1362 u64 page_end;
39279cc3
CM		 1363
1364 if ((offset & (blocksize - 1)) == 0)
1365 goto out;
1366
1367 ret = -ENOMEM;
211c17f5 1368again:
39279cc3
CM		 1369 page = grab_cache_page(mapping, index);
1370 if (!page)
1371 goto out;
e6dcd2dc
CM		 1372
1373 page_start = page_offset(page);
1374 page_end = page_start + PAGE_CACHE_SIZE - 1;
1375
39279cc3 1376 if (!PageUptodate(page)) {
9ebefb18 1377 ret = btrfs_readpage(NULL, page);
39279cc3 1378 lock_page(page);
211c17f5
CM		 1379 if (page->mapping != mapping) {
1380 unlock_page(page);
1381 page_cache_release(page);
1382 goto again;
1383 }
39279cc3
CM		 1384 if (!PageUptodate(page)) {
1385 ret = -EIO;
89642229 1386 goto out_unlock;
39279cc3
CM		 1387 }
1388 }
211c17f5 1389 wait_on_page_writeback(page);
e6dcd2dc
CM		 1390
1391 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
1392 set_page_extent_mapped(page);
1393
1394 ordered = btrfs_lookup_ordered_extent(inode, page_start);
1395 if (ordered) {
1396 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
1397 unlock_page(page);
1398 page_cache_release(page);
eb84ae03 1399 btrfs_start_ordered_extent(inode, ordered, 1);
e6dcd2dc
CM		 1400 btrfs_put_ordered_extent(ordered);
1401 goto again;
1402 }
1403
1404 set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start,
1405 page_end, GFP_NOFS);
1406 ret = 0;
1407 if (offset != PAGE_CACHE_SIZE) {
1408 kaddr = kmap(page);
1409 memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
1410 flush_dcache_page(page);
1411 kunmap(page);
1412 }
247e743c 1413 ClearPageChecked(page);
e6dcd2dc
CM		 1414 set_page_dirty(page);
1415 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
39279cc3 1416
89642229 1417out_unlock:
39279cc3
CM		 1418 unlock_page(page);
1419 page_cache_release(page);
1420out:
1421 return ret;
1422}
1423
1424static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
1425{
1426 struct inode *inode = dentry->d_inode;
1427 int err;
1428
1429 err = inode_change_ok(inode, attr);
1430 if (err)
1431 return err;
1432
1433 if (S_ISREG(inode->i_mode) &&
1434 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
1435 struct btrfs_trans_handle *trans;
1436 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 1437 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2bf5a725 1438
5f39d397 1439 u64 mask = root->sectorsize - 1;
1b0f7c29 1440 u64 hole_start = (inode->i_size + mask) & ~mask;
f392a938 1441 u64 block_end = (attr->ia_size + mask) & ~mask;
39279cc3 1442 u64 hole_size;
179e29e4 1443 u64 alloc_hint = 0;
39279cc3 1444
1b0f7c29 1445 if (attr->ia_size <= hole_start)
39279cc3
CM		 1446 goto out;
1447
1832a6d5 1448 err = btrfs_check_free_space(root, 1, 0);
1832a6d5
CM		 1449 if (err)
1450 goto fail;
1451
39279cc3
CM		 1452 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1453
5f56406a 1454 hole_size = block_end - hole_start;
e6dcd2dc
CM		 1455 btrfs_wait_ordered_range(inode, hole_start, hole_size);
1456 lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
39279cc3 1457
39279cc3
CM		 1458 trans = btrfs_start_transaction(root, 1);
1459 btrfs_set_trans_block_group(trans, inode);
ee6e6504 1460 mutex_lock(&BTRFS_I(inode)->extent_mutex);
2bf5a725 1461 err = btrfs_drop_extents(trans, root, inode,
1b0f7c29 1462 hole_start, block_end, hole_start,
3326d1b0 1463 &alloc_hint);
2bf5a725 1464
179e29e4
CM		 1465 if (alloc_hint != EXTENT_MAP_INLINE) {
1466 err = btrfs_insert_file_extent(trans, root,
1467 inode->i_ino,
5f56406a 1468 hole_start, 0, 0,
f2eb0a24 1469 hole_size, 0);
d1310b2e 1470 btrfs_drop_extent_cache(inode, hole_start,
3b951516 1471 (u64)-1);
5f56406a 1472 btrfs_check_file(root, inode);
179e29e4 1473 }
ee6e6504 1474 mutex_unlock(&BTRFS_I(inode)->extent_mutex);
39279cc3 1475 btrfs_end_transaction(trans, root);
1b0f7c29 1476 unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
54aa1f4d
CM		 1477 if (err)
1478 return err;
39279cc3
CM		 1479 }
1480out:
1481 err = inode_setattr(inode, attr);
33268eaf
JB		 1482
1483 if (!err && ((attr->ia_valid & ATTR_MODE)))
1484 err = btrfs_acl_chmod(inode);
1832a6d5 1485fail:
39279cc3
CM		 1486 return err;
1487}
61295eb8 1488
39279cc3
CM		 1489void btrfs_delete_inode(struct inode *inode)
1490{
1491 struct btrfs_trans_handle *trans;
1492 struct btrfs_root *root = BTRFS_I(inode)->root;
d3c2fdcf 1493 unsigned long nr;
39279cc3
CM		 1494 int ret;
1495
1496 truncate_inode_pages(&inode->i_data, 0);
1497 if (is_bad_inode(inode)) {
1498 goto no_delete;
1499 }
4a096752 1500 btrfs_wait_ordered_range(inode, 0, (u64)-1);
5f39d397 1501
dbe674a9 1502 btrfs_i_size_write(inode, 0);
39279cc3 1503 trans = btrfs_start_transaction(root, 1);
5f39d397 1504
39279cc3 1505 btrfs_set_trans_block_group(trans, inode);
85e21bac 1506 ret = btrfs_truncate_in_trans(trans, root, inode, 0);
54aa1f4d
CM		 1507 if (ret)
1508 goto no_delete_lock;
85e21bac 1509
d3c2fdcf 1510 nr = trans->blocks_used;
85e21bac 1511 clear_inode(inode);
5f39d397 1512
39279cc3 1513 btrfs_end_transaction(trans, root);
d3c2fdcf 1514 btrfs_btree_balance_dirty(root, nr);
39279cc3 1515 return;
54aa1f4d
CM		 1516
1517no_delete_lock:
d3c2fdcf 1518 nr = trans->blocks_used;
54aa1f4d 1519 btrfs_end_transaction(trans, root);
d3c2fdcf 1520 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 1521no_delete:
1522 clear_inode(inode);
1523}
1524
1525/*
1526 * this returns the key found in the dir entry in the location pointer.
1527 * If no dir entries were found, location->objectid is 0.
1528 */
1529static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1530 struct btrfs_key *location)
1531{
1532 const char *name = dentry->d_name.name;
1533 int namelen = dentry->d_name.len;
1534 struct btrfs_dir_item *di;
1535 struct btrfs_path *path;
1536 struct btrfs_root *root = BTRFS_I(dir)->root;
0d9f7f3e 1537 int ret = 0;
39279cc3 1538
3954401f
CM		 1539 if (namelen == 1 && strcmp(name, ".") == 0) {
1540 location->objectid = dir->i_ino;
1541 location->type = BTRFS_INODE_ITEM_KEY;
1542 location->offset = 0;
1543 return 0;
1544 }
39279cc3
CM		 1545 path = btrfs_alloc_path();
1546 BUG_ON(!path);
3954401f 1547
7a720536 1548 if (namelen == 2 && strcmp(name, "..") == 0) {
3954401f
CM		 1549 struct btrfs_key key;
1550 struct extent_buffer *leaf;
1551 u32 nritems;
1552 int slot;
1553
1554 key.objectid = dir->i_ino;
1555 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1556 key.offset = 0;
1557 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1558 BUG_ON(ret == 0);
1559 ret = 0;
1560
1561 leaf = path->nodes[0];
1562 slot = path->slots[0];
1563 nritems = btrfs_header_nritems(leaf);
1564 if (slot >= nritems)
1565 goto out_err;
1566
1567 btrfs_item_key_to_cpu(leaf, &key, slot);
1568 if (key.objectid != dir->i_ino ||
1569 key.type != BTRFS_INODE_REF_KEY) {
1570 goto out_err;
1571 }
1572 location->objectid = key.offset;
1573 location->type = BTRFS_INODE_ITEM_KEY;
1574 location->offset = 0;
1575 goto out;
1576 }
1577
39279cc3
CM		 1578 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1579 namelen, 0);
0d9f7f3e
Y		 1580 if (IS_ERR(di))
1581 ret = PTR_ERR(di);
39279cc3 1582 if (!di || IS_ERR(di)) {
3954401f 1583 goto out_err;
39279cc3 1584 }
5f39d397 1585 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
39279cc3 1586out:
39279cc3
CM		 1587 btrfs_free_path(path);
1588 return ret;
3954401f
CM		 1589out_err:
1590 location->objectid = 0;
1591 goto out;
39279cc3
CM		 1592}
1593
1594/*
1595 * when we hit a tree root in a directory, the btrfs part of the inode
1596 * needs to be changed to reflect the root directory of the tree root. This
1597 * is kind of like crossing a mount point.
1598 */
1599static int fixup_tree_root_location(struct btrfs_root *root,
1600 struct btrfs_key *location,
58176a96
JB		 1601 struct btrfs_root **sub_root,
1602 struct dentry *dentry)
39279cc3
CM		 1603{
1604 struct btrfs_path *path;
1605 struct btrfs_root_item *ri;
1606
1607 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1608 return 0;
1609 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1610 return 0;
1611
1612 path = btrfs_alloc_path();
1613 BUG_ON(!path);
39279cc3 1614
58176a96
JB		 1615 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1616 dentry->d_name.name,
1617 dentry->d_name.len);
39279cc3
CM		 1618 if (IS_ERR(*sub_root))
1619 return PTR_ERR(*sub_root);
1620
1621 ri = &(*sub_root)->root_item;
1622 location->objectid = btrfs_root_dirid(ri);
39279cc3
CM		 1623 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1624 location->offset = 0;
1625
1626 btrfs_free_path(path);
39279cc3
CM		 1627 return 0;
1628}
1629
1630static int btrfs_init_locked_inode(struct inode *inode, void *p)
1631{
1632 struct btrfs_iget_args *args = p;
1633 inode->i_ino = args->ino;
1634 BTRFS_I(inode)->root = args->root;
9069218d 1635 BTRFS_I(inode)->delalloc_bytes = 0;
dbe674a9 1636 BTRFS_I(inode)->disk_i_size = 0;
aec7477b 1637 BTRFS_I(inode)->index_cnt = (u64)-1;
d1310b2e
CM		 1638 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1639 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
b888db2b 1640 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 1641 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1642 inode->i_mapping, GFP_NOFS);
ba1da2f4 1643 btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree);
1b1e2135 1644 mutex_init(&BTRFS_I(inode)->csum_mutex);
ee6e6504 1645 mutex_init(&BTRFS_I(inode)->extent_mutex);
39279cc3
CM		 1646 return 0;
1647}
1648
1649static int btrfs_find_actor(struct inode *inode, void *opaque)
1650{
1651 struct btrfs_iget_args *args = opaque;
1652 return (args->ino == inode->i_ino &&
1653 args->root == BTRFS_I(inode)->root);
1654}
1655
dc17ff8f
CM		 1656struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1657 u64 root_objectid)
1658{
1659 struct btrfs_iget_args args;
1660 args.ino = objectid;
1661 args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);
1662
1663 if (!args.root)
1664 return NULL;
1665
1666 return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
1667}
1668
39279cc3
CM		 1669struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1670 struct btrfs_root *root)
1671{
1672 struct inode *inode;
1673 struct btrfs_iget_args args;
1674 args.ino = objectid;
1675 args.root = root;
1676
1677 inode = iget5_locked(s, objectid, btrfs_find_actor,
1678 btrfs_init_locked_inode,
1679 (void *)&args);
1680 return inode;
1681}
1682
1683static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1684 struct nameidata *nd)
1685{
1686 struct inode * inode;
1687 struct btrfs_inode *bi = BTRFS_I(dir);
1688 struct btrfs_root *root = bi->root;
1689 struct btrfs_root *sub_root = root;
1690 struct btrfs_key location;
1691 int ret;
1692
1693 if (dentry->d_name.len > BTRFS_NAME_LEN)
1694 return ERR_PTR(-ENAMETOOLONG);
5f39d397 1695
39279cc3 1696 ret = btrfs_inode_by_name(dir, dentry, &location);
5f39d397 1697
39279cc3
CM		 1698 if (ret < 0)
1699 return ERR_PTR(ret);
5f39d397 1700
39279cc3
CM		 1701 inode = NULL;
1702 if (location.objectid) {
58176a96
JB		 1703 ret = fixup_tree_root_location(root, &location, &sub_root,
1704 dentry);
39279cc3
CM		 1705 if (ret < 0)
1706 return ERR_PTR(ret);
1707 if (ret > 0)
1708 return ERR_PTR(-ENOENT);
1709 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1710 sub_root);
1711 if (!inode)
1712 return ERR_PTR(-EACCES);
1713 if (inode->i_state & I_NEW) {
1714 /* the inode and parent dir are two different roots */
1715 if (sub_root != root) {
1716 igrab(inode);
1717 sub_root->inode = inode;
1718 }
1719 BTRFS_I(inode)->root = sub_root;
1720 memcpy(&BTRFS_I(inode)->location, &location,
1721 sizeof(location));
1722 btrfs_read_locked_inode(inode);
1723 unlock_new_inode(inode);
1724 }
1725 }
1726 return d_splice_alias(inode, dentry);
1727}
1728
39279cc3
CM		 1729static unsigned char btrfs_filetype_table[] = {
1730 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1731};
1732
1733static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1734{
6da6abae 1735 struct inode *inode = filp->f_dentry->d_inode;
39279cc3
CM		 1736 struct btrfs_root *root = BTRFS_I(inode)->root;
1737 struct btrfs_item *item;
1738 struct btrfs_dir_item *di;
1739 struct btrfs_key key;
5f39d397 1740 struct btrfs_key found_key;
39279cc3
CM		 1741 struct btrfs_path *path;
1742 int ret;
1743 u32 nritems;
5f39d397 1744 struct extent_buffer *leaf;
39279cc3
CM		 1745 int slot;
1746 int advance;
1747 unsigned char d_type;
1748 int over = 0;
1749 u32 di_cur;
1750 u32 di_total;
1751 u32 di_len;
1752 int key_type = BTRFS_DIR_INDEX_KEY;
5f39d397
CM		 1753 char tmp_name[32];
1754 char *name_ptr;
1755 int name_len;
39279cc3
CM		 1756
1757 /* FIXME, use a real flag for deciding about the key type */
1758 if (root->fs_info->tree_root == root)
1759 key_type = BTRFS_DIR_ITEM_KEY;
5f39d397 1760
3954401f
CM		 1761 /* special case for "." */
1762 if (filp->f_pos == 0) {
1763 over = filldir(dirent, ".", 1,
1764 1, inode->i_ino,
1765 DT_DIR);
1766 if (over)
1767 return 0;
1768 filp->f_pos = 1;
1769 }
1770
39279cc3 1771 key.objectid = inode->i_ino;
3954401f
CM		 1772 path = btrfs_alloc_path();
1773 path->reada = 2;
1774
1775 /* special case for .., just use the back ref */
1776 if (filp->f_pos == 1) {
1777 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1778 key.offset = 0;
1779 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1780 BUG_ON(ret == 0);
1781 leaf = path->nodes[0];
1782 slot = path->slots[0];
1783 nritems = btrfs_header_nritems(leaf);
1784 if (slot >= nritems) {
1785 btrfs_release_path(root, path);
1786 goto read_dir_items;
1787 }
1788 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1789 btrfs_release_path(root, path);
1790 if (found_key.objectid != key.objectid ||
1791 found_key.type != BTRFS_INODE_REF_KEY)
1792 goto read_dir_items;
1793 over = filldir(dirent, "..", 2,
1794 2, found_key.offset, DT_DIR);
1795 if (over)
1796 goto nopos;
1797 filp->f_pos = 2;
1798 }
1799
1800read_dir_items:
39279cc3
CM		 1801 btrfs_set_key_type(&key, key_type);
1802 key.offset = filp->f_pos;
5f39d397 1803
39279cc3
CM		 1804 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1805 if (ret < 0)
1806 goto err;
1807 advance = 0;
39279cc3 1808 while(1) {
5f39d397
CM		 1809 leaf = path->nodes[0];
1810 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1811 slot = path->slots[0];
1812 if (advance || slot >= nritems) {
1813 if (slot >= nritems -1) {
39279cc3
CM		 1814 ret = btrfs_next_leaf(root, path);
1815 if (ret)
1816 break;
5f39d397
CM		 1817 leaf = path->nodes[0];
1818 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1819 slot = path->slots[0];
1820 } else {
1821 slot++;
1822 path->slots[0]++;
1823 }
1824 }
1825 advance = 1;
5f39d397
CM		 1826 item = btrfs_item_nr(leaf, slot);
1827 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1828
1829 if (found_key.objectid != key.objectid)
39279cc3 1830 break;
5f39d397 1831 if (btrfs_key_type(&found_key) != key_type)
39279cc3 1832 break;
5f39d397 1833 if (found_key.offset < filp->f_pos)
39279cc3 1834 continue;
5f39d397
CM		 1835
1836 filp->f_pos = found_key.offset;
39279cc3
CM		 1837 advance = 1;
1838 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1839 di_cur = 0;
5f39d397 1840 di_total = btrfs_item_size(leaf, item);
39279cc3 1841 while(di_cur < di_total) {
5f39d397
CM		 1842 struct btrfs_key location;
1843
1844 name_len = btrfs_dir_name_len(leaf, di);
1845 if (name_len < 32) {
1846 name_ptr = tmp_name;
1847 } else {
1848 name_ptr = kmalloc(name_len, GFP_NOFS);
1849 BUG_ON(!name_ptr);
1850 }
1851 read_extent_buffer(leaf, name_ptr,
1852 (unsigned long)(di + 1), name_len);
1853
1854 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1855 btrfs_dir_item_key_to_cpu(leaf, di, &location);
5f39d397
CM		 1856 over = filldir(dirent, name_ptr, name_len,
1857 found_key.offset,
1858 location.objectid,
39279cc3 1859 d_type);
5f39d397
CM		 1860
1861 if (name_ptr != tmp_name)
1862 kfree(name_ptr);
1863
39279cc3
CM		 1864 if (over)
1865 goto nopos;
5103e947
JB		 1866 di_len = btrfs_dir_name_len(leaf, di) +
1867 btrfs_dir_data_len(leaf, di) +sizeof(*di);
39279cc3
CM		 1868 di_cur += di_len;
1869 di = (struct btrfs_dir_item *)((char *)di + di_len);
1870 }
1871 }
5e591a07
YZ		 1872 if (key_type == BTRFS_DIR_INDEX_KEY)
1873 filp->f_pos = INT_LIMIT(typeof(filp->f_pos));
1874 else
1875 filp->f_pos++;
39279cc3
CM		 1876nopos:
1877 ret = 0;
1878err:
39279cc3 1879 btrfs_free_path(path);
39279cc3
CM		 1880 return ret;
1881}
1882
1883int btrfs_write_inode(struct inode *inode, int wait)
1884{
1885 struct btrfs_root *root = BTRFS_I(inode)->root;
1886 struct btrfs_trans_handle *trans;
1887 int ret = 0;
1888
1889 if (wait) {
f9295749 1890 trans = btrfs_join_transaction(root, 1);
39279cc3
CM		 1891 btrfs_set_trans_block_group(trans, inode);
1892 ret = btrfs_commit_transaction(trans, root);
39279cc3
CM		 1893 }
1894 return ret;
1895}
1896
1897/*
54aa1f4d 1898 * This is somewhat expensive, updating the tree every time the
39279cc3
CM		 1899 * inode changes. But, it is most likely to find the inode in cache.
1900 * FIXME, needs more benchmarking...there are no reasons other than performance
1901 * to keep or drop this code.
1902 */
1903void btrfs_dirty_inode(struct inode *inode)
1904{
1905 struct btrfs_root *root = BTRFS_I(inode)->root;
1906 struct btrfs_trans_handle *trans;
1907
f9295749 1908 trans = btrfs_join_transaction(root, 1);
39279cc3
CM		 1909 btrfs_set_trans_block_group(trans, inode);
1910 btrfs_update_inode(trans, root, inode);
1911 btrfs_end_transaction(trans, root);
39279cc3
CM		 1912}
1913
aec7477b
JB		 1914static int btrfs_set_inode_index_count(struct inode *inode)
1915{
1916 struct btrfs_root *root = BTRFS_I(inode)->root;
1917 struct btrfs_key key, found_key;
1918 struct btrfs_path *path;
1919 struct extent_buffer *leaf;
1920 int ret;
1921
1922 key.objectid = inode->i_ino;
1923 btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
1924 key.offset = (u64)-1;
1925
1926 path = btrfs_alloc_path();
1927 if (!path)
1928 return -ENOMEM;
1929
1930 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1931 if (ret < 0)
1932 goto out;
1933 /* FIXME: we should be able to handle this */
1934 if (ret == 0)
1935 goto out;
1936 ret = 0;
1937
1938 /*
1939 * MAGIC NUMBER EXPLANATION:
1940 * since we search a directory based on f_pos we have to start at 2
1941 * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody
1942 * else has to start at 2
1943 */
1944 if (path->slots[0] == 0) {
1945 BTRFS_I(inode)->index_cnt = 2;
1946 goto out;
1947 }
1948
1949 path->slots[0]--;
1950
1951 leaf = path->nodes[0];
1952 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1953
1954 if (found_key.objectid != inode->i_ino ||
1955 btrfs_key_type(&found_key) != BTRFS_DIR_INDEX_KEY) {
1956 BTRFS_I(inode)->index_cnt = 2;
1957 goto out;
1958 }
1959
1960 BTRFS_I(inode)->index_cnt = found_key.offset + 1;
1961out:
1962 btrfs_free_path(path);
1963 return ret;
1964}
1965
1966static int btrfs_set_inode_index(struct inode *dir, struct inode *inode)
1967{
1968 int ret = 0;
1969
1970 if (BTRFS_I(dir)->index_cnt == (u64)-1) {
1971 ret = btrfs_set_inode_index_count(dir);
1972 if (ret)
1973 return ret;
1974 }
1975
1976 BTRFS_I(inode)->index = BTRFS_I(dir)->index_cnt;
1977 BTRFS_I(dir)->index_cnt++;
1978
1979 return ret;
1980}
1981
39279cc3
CM		 1982static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1983 struct btrfs_root *root,
aec7477b 1984 struct inode *dir,
9c58309d
CM		 1985 const char *name, int name_len,
1986 u64 ref_objectid,
39279cc3
CM		 1987 u64 objectid,
1988 struct btrfs_block_group_cache *group,
1989 int mode)
1990{
1991 struct inode *inode;
5f39d397 1992 struct btrfs_inode_item *inode_item;
6324fbf3 1993 struct btrfs_block_group_cache *new_inode_group;
39279cc3 1994 struct btrfs_key *location;
5f39d397 1995 struct btrfs_path *path;
9c58309d
CM		 1996 struct btrfs_inode_ref *ref;
1997 struct btrfs_key key[2];
1998 u32 sizes[2];
1999 unsigned long ptr;
39279cc3
CM		 2000 int ret;
2001 int owner;
2002
5f39d397
CM		 2003 path = btrfs_alloc_path();
2004 BUG_ON(!path);
2005
39279cc3
CM		 2006 inode = new_inode(root->fs_info->sb);
2007 if (!inode)
2008 return ERR_PTR(-ENOMEM);
2009
aec7477b
JB		 2010 if (dir) {
2011 ret = btrfs_set_inode_index(dir, inode);
2012 if (ret)
2013 return ERR_PTR(ret);
2014 } else {
2015 BTRFS_I(inode)->index = 0;
2016 }
2017 /*
2018 * index_cnt is ignored for everything but a dir,
2019 * btrfs_get_inode_index_count has an explanation for the magic
2020 * number
2021 */
2022 BTRFS_I(inode)->index_cnt = 2;
2023
d1310b2e
CM		 2024 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
2025 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
b888db2b 2026 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 2027 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
2028 inode->i_mapping, GFP_NOFS);
ba1da2f4 2029 btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree);
1b1e2135 2030 mutex_init(&BTRFS_I(inode)->csum_mutex);
ee6e6504 2031 mutex_init(&BTRFS_I(inode)->extent_mutex);
9069218d 2032 BTRFS_I(inode)->delalloc_bytes = 0;
dbe674a9 2033 BTRFS_I(inode)->disk_i_size = 0;
39279cc3 2034 BTRFS_I(inode)->root = root;
b888db2b 2035
39279cc3
CM		 2036 if (mode & S_IFDIR)
2037 owner = 0;
2038 else
2039 owner = 1;
6324fbf3 2040 new_inode_group = btrfs_find_block_group(root, group, 0,
0b86a832 2041 BTRFS_BLOCK_GROUP_METADATA, owner);
6324fbf3
CM		 2042 if (!new_inode_group) {
2043 printk("find_block group failed\n");
2044 new_inode_group = group;
2045 }
2046 BTRFS_I(inode)->block_group = new_inode_group;
b98b6767 2047 BTRFS_I(inode)->flags = 0;
9c58309d
CM		 2048
2049 key[0].objectid = objectid;
2050 btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY);
2051 key[0].offset = 0;
2052
2053 key[1].objectid = objectid;
2054 btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY);
2055 key[1].offset = ref_objectid;
2056
2057 sizes[0] = sizeof(struct btrfs_inode_item);
2058 sizes[1] = name_len + sizeof(*ref);
2059
2060 ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2);
2061 if (ret != 0)
5f39d397
CM		 2062 goto fail;
2063
9c58309d
CM		 2064 if (objectid > root->highest_inode)
2065 root->highest_inode = objectid;
2066
39279cc3
CM		 2067 inode->i_uid = current->fsuid;
2068 inode->i_gid = current->fsgid;
2069 inode->i_mode = mode;
2070 inode->i_ino = objectid;
2071 inode->i_blocks = 0;
2072 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
5f39d397
CM		 2073 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
2074 struct btrfs_inode_item);
2075 fill_inode_item(path->nodes[0], inode_item, inode);
9c58309d
CM		 2076
2077 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
2078 struct btrfs_inode_ref);
2079 btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
aec7477b 2080 btrfs_set_inode_ref_index(path->nodes[0], ref, BTRFS_I(inode)->index);
9c58309d
CM		 2081 ptr = (unsigned long)(ref + 1);
2082 write_extent_buffer(path->nodes[0], name, ptr, name_len);
2083
5f39d397
CM		 2084 btrfs_mark_buffer_dirty(path->nodes[0]);
2085 btrfs_free_path(path);
2086
39279cc3
CM		 2087 location = &BTRFS_I(inode)->location;
2088 location->objectid = objectid;
39279cc3
CM		 2089 location->offset = 0;
2090 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
2091
39279cc3
CM		 2092 insert_inode_hash(inode);
2093 return inode;
5f39d397 2094fail:
aec7477b
JB		 2095 if (dir)
2096 BTRFS_I(dir)->index_cnt--;
5f39d397
CM		 2097 btrfs_free_path(path);
2098 return ERR_PTR(ret);
39279cc3
CM		 2099}
2100
2101static inline u8 btrfs_inode_type(struct inode *inode)
2102{
2103 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
2104}
2105
2106static int btrfs_add_link(struct btrfs_trans_handle *trans,
9c58309d
CM		 2107 struct dentry *dentry, struct inode *inode,
2108 int add_backref)
39279cc3
CM		 2109{
2110 int ret;
2111 struct btrfs_key key;
2112 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
aec7477b 2113 struct inode *parent_inode = dentry->d_parent->d_inode;
5f39d397 2114
39279cc3 2115 key.objectid = inode->i_ino;
39279cc3
CM		 2116 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
2117 key.offset = 0;
2118
2119 ret = btrfs_insert_dir_item(trans, root,
2120 dentry->d_name.name, dentry->d_name.len,
2121 dentry->d_parent->d_inode->i_ino,
aec7477b
JB		 2122 &key, btrfs_inode_type(inode),
2123 BTRFS_I(inode)->index);
39279cc3 2124 if (ret == 0) {
9c58309d
CM		 2125 if (add_backref) {
2126 ret = btrfs_insert_inode_ref(trans, root,
2127 dentry->d_name.name,
2128 dentry->d_name.len,
2129 inode->i_ino,
aec7477b
JB		 2130 parent_inode->i_ino,
2131 BTRFS_I(inode)->index);
9c58309d 2132 }
dbe674a9
CM		 2133 btrfs_i_size_write(parent_inode, parent_inode->i_size +
2134 dentry->d_name.len * 2);
79c44584 2135 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
39279cc3
CM		 2136 ret = btrfs_update_inode(trans, root,
2137 dentry->d_parent->d_inode);
2138 }
2139 return ret;
2140}
2141
2142static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
9c58309d
CM		 2143 struct dentry *dentry, struct inode *inode,
2144 int backref)
39279cc3 2145{
9c58309d 2146 int err = btrfs_add_link(trans, dentry, inode, backref);
39279cc3
CM		 2147 if (!err) {
2148 d_instantiate(dentry, inode);
2149 return 0;
2150 }
2151 if (err > 0)
2152 err = -EEXIST;
2153 return err;
2154}
2155
618e21d5
JB		 2156static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
2157 int mode, dev_t rdev)
2158{
2159 struct btrfs_trans_handle *trans;
2160 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 2161 struct inode *inode = NULL;
618e21d5
JB		 2162 int err;
2163 int drop_inode = 0;
2164 u64 objectid;
1832a6d5 2165 unsigned long nr = 0;
618e21d5
JB		 2166
2167 if (!new_valid_dev(rdev))
2168 return -EINVAL;
2169
1832a6d5
CM		 2170 err = btrfs_check_free_space(root, 1, 0);
2171 if (err)
2172 goto fail;
2173
618e21d5
JB		 2174 trans = btrfs_start_transaction(root, 1);
2175 btrfs_set_trans_block_group(trans, dir);
2176
2177 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2178 if (err) {
2179 err = -ENOSPC;
2180 goto out_unlock;
2181 }
2182
aec7477b 2183 inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
9c58309d
CM		 2184 dentry->d_name.len,
2185 dentry->d_parent->d_inode->i_ino, objectid,
618e21d5
JB		 2186 BTRFS_I(dir)->block_group, mode);
2187 err = PTR_ERR(inode);
2188 if (IS_ERR(inode))
2189 goto out_unlock;
2190
33268eaf
JB		 2191 err = btrfs_init_acl(inode, dir);
2192 if (err) {
2193 drop_inode = 1;
2194 goto out_unlock;
2195 }
2196
618e21d5 2197 btrfs_set_trans_block_group(trans, inode);
9c58309d 2198 err = btrfs_add_nondir(trans, dentry, inode, 0);
618e21d5
JB		 2199 if (err)
2200 drop_inode = 1;
2201 else {
2202 inode->i_op = &btrfs_special_inode_operations;
2203 init_special_inode(inode, inode->i_mode, rdev);
1b4ab1bb 2204 btrfs_update_inode(trans, root, inode);
618e21d5
JB		 2205 }
2206 dir->i_sb->s_dirt = 1;
2207 btrfs_update_inode_block_group(trans, inode);
2208 btrfs_update_inode_block_group(trans, dir);
2209out_unlock:
d3c2fdcf 2210 nr = trans->blocks_used;
89ce8a63 2211 btrfs_end_transaction_throttle(trans, root);
1832a6d5 2212fail:
618e21d5
JB		 2213 if (drop_inode) {
2214 inode_dec_link_count(inode);
2215 iput(inode);
2216 }
d3c2fdcf 2217 btrfs_btree_balance_dirty(root, nr);
618e21d5
JB		 2218 return err;
2219}
2220
39279cc3
CM		 2221static int btrfs_create(struct inode *dir, struct dentry *dentry,
2222 int mode, struct nameidata *nd)
2223{
2224 struct btrfs_trans_handle *trans;
2225 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 2226 struct inode *inode = NULL;
39279cc3
CM		 2227 int err;
2228 int drop_inode = 0;
1832a6d5 2229 unsigned long nr = 0;
39279cc3
CM		 2230 u64 objectid;
2231
1832a6d5
CM		 2232 err = btrfs_check_free_space(root, 1, 0);
2233 if (err)
2234 goto fail;
39279cc3
CM		 2235 trans = btrfs_start_transaction(root, 1);
2236 btrfs_set_trans_block_group(trans, dir);
2237
2238 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2239 if (err) {
2240 err = -ENOSPC;
2241 goto out_unlock;
2242 }
2243
aec7477b 2244 inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
9c58309d
CM		 2245 dentry->d_name.len,
2246 dentry->d_parent->d_inode->i_ino,
2247 objectid, BTRFS_I(dir)->block_group, mode);
39279cc3
CM		 2248 err = PTR_ERR(inode);
2249 if (IS_ERR(inode))
2250 goto out_unlock;
2251
33268eaf
JB		 2252 err = btrfs_init_acl(inode, dir);
2253 if (err) {
2254 drop_inode = 1;
2255 goto out_unlock;
2256 }
2257
39279cc3 2258 btrfs_set_trans_block_group(trans, inode);
9c58309d 2259 err = btrfs_add_nondir(trans, dentry, inode, 0);
39279cc3
CM		 2260 if (err)
2261 drop_inode = 1;
2262 else {
2263 inode->i_mapping->a_ops = &btrfs_aops;
04160088 2264 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3
CM		 2265 inode->i_fop = &btrfs_file_operations;
2266 inode->i_op = &btrfs_file_inode_operations;
d1310b2e
CM		 2267 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
2268 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
a52d9a80 2269 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 2270 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
2271 inode->i_mapping, GFP_NOFS);
1b1e2135 2272 mutex_init(&BTRFS_I(inode)->csum_mutex);
ee6e6504 2273 mutex_init(&BTRFS_I(inode)->extent_mutex);
9069218d 2274 BTRFS_I(inode)->delalloc_bytes = 0;
dbe674a9 2275 BTRFS_I(inode)->disk_i_size = 0;
d1310b2e 2276 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
ba1da2f4 2277 btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree);
39279cc3
CM		 2278 }
2279 dir->i_sb->s_dirt = 1;
2280 btrfs_update_inode_block_group(trans, inode);
2281 btrfs_update_inode_block_group(trans, dir);
2282out_unlock:
d3c2fdcf 2283 nr = trans->blocks_used;
89ce8a63 2284 btrfs_end_transaction_throttle(trans, root);
1832a6d5 2285fail:
39279cc3
CM		 2286 if (drop_inode) {
2287 inode_dec_link_count(inode);
2288 iput(inode);
2289 }
d3c2fdcf 2290 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 2291 return err;
2292}
2293
2294static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
2295 struct dentry *dentry)
2296{
2297 struct btrfs_trans_handle *trans;
2298 struct btrfs_root *root = BTRFS_I(dir)->root;
2299 struct inode *inode = old_dentry->d_inode;
1832a6d5 2300 unsigned long nr = 0;
39279cc3
CM		 2301 int err;
2302 int drop_inode = 0;
2303
2304 if (inode->i_nlink == 0)
2305 return -ENOENT;
2306
6da6abae
CM		 2307#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
2308 inode->i_nlink++;
2309#else
39279cc3 2310 inc_nlink(inode);
6da6abae 2311#endif
1832a6d5
CM		 2312 err = btrfs_check_free_space(root, 1, 0);
2313 if (err)
2314 goto fail;
aec7477b
JB		 2315 err = btrfs_set_inode_index(dir, inode);
2316 if (err)
2317 goto fail;
2318
39279cc3 2319 trans = btrfs_start_transaction(root, 1);
5f39d397 2320
39279cc3
CM		 2321 btrfs_set_trans_block_group(trans, dir);
2322 atomic_inc(&inode->i_count);
aec7477b 2323
9c58309d 2324 err = btrfs_add_nondir(trans, dentry, inode, 1);
5f39d397 2325
39279cc3
CM		 2326 if (err)
2327 drop_inode = 1;
5f39d397 2328
39279cc3
CM		 2329 dir->i_sb->s_dirt = 1;
2330 btrfs_update_inode_block_group(trans, dir);
54aa1f4d 2331 err = btrfs_update_inode(trans, root, inode);
5f39d397 2332
54aa1f4d
CM		 2333 if (err)
2334 drop_inode = 1;
39279cc3 2335
d3c2fdcf 2336 nr = trans->blocks_used;
89ce8a63 2337 btrfs_end_transaction_throttle(trans, root);
1832a6d5 2338fail:
39279cc3
CM		 2339 if (drop_inode) {
2340 inode_dec_link_count(inode);
2341 iput(inode);
2342 }
d3c2fdcf 2343 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 2344 return err;
2345}
2346
39279cc3
CM		 2347static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
2348{
b9d86667 2349 struct inode *inode = NULL;
39279cc3
CM		 2350 struct btrfs_trans_handle *trans;
2351 struct btrfs_root *root = BTRFS_I(dir)->root;
2352 int err = 0;
2353 int drop_on_err = 0;
b9d86667 2354 u64 objectid = 0;
d3c2fdcf 2355 unsigned long nr = 1;
39279cc3 2356
1832a6d5
CM		 2357 err = btrfs_check_free_space(root, 1, 0);
2358 if (err)
2359 goto out_unlock;
2360
39279cc3
CM		 2361 trans = btrfs_start_transaction(root, 1);
2362 btrfs_set_trans_block_group(trans, dir);
5f39d397 2363
39279cc3
CM		 2364 if (IS_ERR(trans)) {
2365 err = PTR_ERR(trans);
2366 goto out_unlock;
2367 }
2368
2369 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2370 if (err) {
2371 err = -ENOSPC;
2372 goto out_unlock;
2373 }
2374
aec7477b 2375 inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
9c58309d
CM		 2376 dentry->d_name.len,
2377 dentry->d_parent->d_inode->i_ino, objectid,
39279cc3
CM		 2378 BTRFS_I(dir)->block_group, S_IFDIR | mode);
2379 if (IS_ERR(inode)) {
2380 err = PTR_ERR(inode);
2381 goto out_fail;
2382 }
5f39d397 2383
39279cc3 2384 drop_on_err = 1;
33268eaf
JB		 2385
2386 err = btrfs_init_acl(inode, dir);
2387 if (err)
2388 goto out_fail;
2389
39279cc3
CM		 2390 inode->i_op = &btrfs_dir_inode_operations;
2391 inode->i_fop = &btrfs_dir_file_operations;
2392 btrfs_set_trans_block_group(trans, inode);
2393
dbe674a9 2394 btrfs_i_size_write(inode, 0);
39279cc3
CM		 2395 err = btrfs_update_inode(trans, root, inode);
2396 if (err)
2397 goto out_fail;
5f39d397 2398
9c58309d 2399 err = btrfs_add_link(trans, dentry, inode, 0);
39279cc3
CM		 2400 if (err)
2401 goto out_fail;
5f39d397 2402
39279cc3
CM		 2403 d_instantiate(dentry, inode);
2404 drop_on_err = 0;
2405 dir->i_sb->s_dirt = 1;
2406 btrfs_update_inode_block_group(trans, inode);
2407 btrfs_update_inode_block_group(trans, dir);
2408
2409out_fail:
d3c2fdcf 2410 nr = trans->blocks_used;
89ce8a63 2411 btrfs_end_transaction_throttle(trans, root);
5f39d397 2412
39279cc3 2413out_unlock:
39279cc3
CM		 2414 if (drop_on_err)
2415 iput(inode);
d3c2fdcf 2416 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 2417 return err;
2418}
2419
3b951516
CM		 2420static int merge_extent_mapping(struct extent_map_tree *em_tree,
2421 struct extent_map *existing,
e6dcd2dc
CM		 2422 struct extent_map *em,
2423 u64 map_start, u64 map_len)
3b951516
CM		 2424{
2425 u64 start_diff;
3b951516 2426
e6dcd2dc
CM		 2427 BUG_ON(map_start < em->start || map_start >= extent_map_end(em));
2428 start_diff = map_start - em->start;
2429 em->start = map_start;
2430 em->len = map_len;
2431 if (em->block_start < EXTENT_MAP_LAST_BYTE)
2432 em->block_start += start_diff;
2433 return add_extent_mapping(em_tree, em);
3b951516
CM		 2434}
2435
a52d9a80 2436struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
70dec807 2437 size_t pg_offset, u64 start, u64 len,
a52d9a80
CM		 2438 int create)
2439{
2440 int ret;
2441 int err = 0;
db94535d 2442 u64 bytenr;
a52d9a80
CM		 2443 u64 extent_start = 0;
2444 u64 extent_end = 0;
2445 u64 objectid = inode->i_ino;
2446 u32 found_type;
f421950f 2447 struct btrfs_path *path = NULL;
a52d9a80
CM		 2448 struct btrfs_root *root = BTRFS_I(inode)->root;
2449 struct btrfs_file_extent_item *item;
5f39d397
CM		 2450 struct extent_buffer *leaf;
2451 struct btrfs_key found_key;
a52d9a80
CM		 2452 struct extent_map *em = NULL;
2453 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
d1310b2e 2454 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
a52d9a80
CM		 2455 struct btrfs_trans_handle *trans = NULL;
2456
a52d9a80 2457again:
d1310b2e
CM		 2458 spin_lock(&em_tree->lock);
2459 em = lookup_extent_mapping(em_tree, start, len);
a061fc8d
CM		 2460 if (em)
2461 em->bdev = root->fs_info->fs_devices->latest_bdev;
d1310b2e
CM		 2462 spin_unlock(&em_tree->lock);
2463
a52d9a80 2464 if (em) {
e1c4b745
CM		 2465 if (em->start > start || em->start + em->len <= start)
2466 free_extent_map(em);
2467 else if (em->block_start == EXTENT_MAP_INLINE && page)
70dec807
CM		 2468 free_extent_map(em);
2469 else
2470 goto out;
a52d9a80 2471 }
d1310b2e 2472 em = alloc_extent_map(GFP_NOFS);
a52d9a80 2473 if (!em) {
d1310b2e
CM		 2474 err = -ENOMEM;
2475 goto out;
a52d9a80 2476 }
e6dcd2dc 2477 em->bdev = root->fs_info->fs_devices->latest_bdev;
d1310b2e
CM		 2478 em->start = EXTENT_MAP_HOLE;
2479 em->len = (u64)-1;
f421950f
CM		 2480
2481 if (!path) {
2482 path = btrfs_alloc_path();
2483 BUG_ON(!path);
2484 }
2485
179e29e4
CM		 2486 ret = btrfs_lookup_file_extent(trans, root, path,
2487 objectid, start, trans != NULL);
a52d9a80
CM		 2488 if (ret < 0) {
2489 err = ret;
2490 goto out;
2491 }
2492
2493 if (ret != 0) {
2494 if (path->slots[0] == 0)
2495 goto not_found;
2496 path->slots[0]--;
2497 }
2498
5f39d397
CM		 2499 leaf = path->nodes[0];
2500 item = btrfs_item_ptr(leaf, path->slots[0],
a52d9a80 2501 struct btrfs_file_extent_item);
a52d9a80 2502 /* are we inside the extent that was found? */
5f39d397
CM		 2503 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2504 found_type = btrfs_key_type(&found_key);
2505 if (found_key.objectid != objectid ||
a52d9a80
CM		 2506 found_type != BTRFS_EXTENT_DATA_KEY) {
2507 goto not_found;
2508 }
2509
5f39d397
CM		 2510 found_type = btrfs_file_extent_type(leaf, item);
2511 extent_start = found_key.offset;
a52d9a80
CM		 2512 if (found_type == BTRFS_FILE_EXTENT_REG) {
2513 extent_end = extent_start +
db94535d 2514 btrfs_file_extent_num_bytes(leaf, item);
a52d9a80 2515 err = 0;
b888db2b 2516 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 2517 em->start = start;
2518 if (start < extent_start) {
d1310b2e 2519 if (start + len <= extent_start)
b888db2b 2520 goto not_found;
d1310b2e 2521 em->len = extent_end - extent_start;
a52d9a80 2522 } else {
d1310b2e 2523 em->len = len;
a52d9a80
CM		 2524 }
2525 goto not_found_em;
2526 }
db94535d
CM		 2527 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
2528 if (bytenr == 0) {
a52d9a80 2529 em->start = extent_start;
d1310b2e 2530 em->len = extent_end - extent_start;
5f39d397 2531 em->block_start = EXTENT_MAP_HOLE;
a52d9a80
CM		 2532 goto insert;
2533 }
db94535d
CM		 2534 bytenr += btrfs_file_extent_offset(leaf, item);
2535 em->block_start = bytenr;
a52d9a80 2536 em->start = extent_start;
d1310b2e 2537 em->len = extent_end - extent_start;
a52d9a80
CM		 2538 goto insert;
2539 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
70dec807 2540 u64 page_start;
5f39d397 2541 unsigned long ptr;
a52d9a80 2542 char *map;
3326d1b0
CM		 2543 size_t size;
2544 size_t extent_offset;
2545 size_t copy_size;
a52d9a80 2546
5f39d397
CM		 2547 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
2548 path->slots[0]));
d1310b2e
CM		 2549 extent_end = (extent_start + size + root->sectorsize - 1) &
2550 ~((u64)root->sectorsize - 1);
b888db2b 2551 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 2552 em->start = start;
2553 if (start < extent_start) {
d1310b2e 2554 if (start + len <= extent_start)
b888db2b 2555 goto not_found;
d1310b2e 2556 em->len = extent_end - extent_start;
a52d9a80 2557 } else {
d1310b2e 2558 em->len = len;
a52d9a80
CM		 2559 }
2560 goto not_found_em;
2561 }
689f9346 2562 em->block_start = EXTENT_MAP_INLINE;
689f9346
Y		 2563
2564 if (!page) {
2565 em->start = extent_start;
d1310b2e 2566 em->len = size;
689f9346
Y		 2567 goto out;
2568 }
5f39d397 2569
70dec807
CM		 2570 page_start = page_offset(page) + pg_offset;
2571 extent_offset = page_start - extent_start;
2572 copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
3326d1b0 2573 size - extent_offset);
3326d1b0 2574 em->start = extent_start + extent_offset;
70dec807
CM		 2575 em->len = (copy_size + root->sectorsize - 1) &
2576 ~((u64)root->sectorsize - 1);
689f9346
Y		 2577 map = kmap(page);
2578 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
179e29e4 2579 if (create == 0 && !PageUptodate(page)) {
70dec807 2580 read_extent_buffer(leaf, map + pg_offset, ptr,
179e29e4
CM		 2581 copy_size);
2582 flush_dcache_page(page);
2583 } else if (create && PageUptodate(page)) {
2584 if (!trans) {
2585 kunmap(page);
2586 free_extent_map(em);
2587 em = NULL;
2588 btrfs_release_path(root, path);
f9295749 2589 trans = btrfs_join_transaction(root, 1);
179e29e4
CM		 2590 goto again;
2591 }
70dec807 2592 write_extent_buffer(leaf, map + pg_offset, ptr,
179e29e4
CM		 2593 copy_size);
2594 btrfs_mark_buffer_dirty(leaf);
a52d9a80 2595 }
a52d9a80 2596 kunmap(page);
d1310b2e
CM		 2597 set_extent_uptodate(io_tree, em->start,
2598 extent_map_end(em) - 1, GFP_NOFS);
a52d9a80
CM		 2599 goto insert;
2600 } else {
2601 printk("unkknown found_type %d\n", found_type);
2602 WARN_ON(1);
2603 }
2604not_found:
2605 em->start = start;
d1310b2e 2606 em->len = len;
a52d9a80 2607not_found_em:
5f39d397 2608 em->block_start = EXTENT_MAP_HOLE;
a52d9a80
CM		 2609insert:
2610 btrfs_release_path(root, path);
d1310b2e
CM		 2611 if (em->start > start || extent_map_end(em) <= start) {
2612 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len);
a52d9a80
CM		 2613 err = -EIO;
2614 goto out;
2615 }
d1310b2e
CM		 2616
2617 err = 0;
2618 spin_lock(&em_tree->lock);
a52d9a80 2619 ret = add_extent_mapping(em_tree, em);
3b951516
CM		 2620 /* it is possible that someone inserted the extent into the tree
2621 * while we had the lock dropped. It is also possible that
2622 * an overlapping map exists in the tree
2623 */
a52d9a80 2624 if (ret == -EEXIST) {
3b951516 2625 struct extent_map *existing;
e6dcd2dc
CM		 2626
2627 ret = 0;
2628
3b951516 2629 existing = lookup_extent_mapping(em_tree, start, len);
e1c4b745
CM		 2630 if (existing && (existing->start > start ||
2631 existing->start + existing->len <= start)) {
2632 free_extent_map(existing);
2633 existing = NULL;
2634 }
3b951516
CM		 2635 if (!existing) {
2636 existing = lookup_extent_mapping(em_tree, em->start,
2637 em->len);
2638 if (existing) {
2639 err = merge_extent_mapping(em_tree, existing,
e6dcd2dc
CM		 2640 em, start,
2641 root->sectorsize);
3b951516
CM		 2642 free_extent_map(existing);
2643 if (err) {
2644 free_extent_map(em);
2645 em = NULL;
2646 }
2647 } else {
2648 err = -EIO;
2649 printk("failing to insert %Lu %Lu\n",
2650 start, len);
2651 free_extent_map(em);
2652 em = NULL;
2653 }
2654 } else {
2655 free_extent_map(em);
2656 em = existing;
e6dcd2dc 2657 err = 0;
a52d9a80 2658 }
a52d9a80 2659 }
d1310b2e 2660 spin_unlock(&em_tree->lock);
a52d9a80 2661out:
f421950f
CM		 2662 if (path)
2663 btrfs_free_path(path);
a52d9a80
CM		 2664 if (trans) {
2665 ret = btrfs_end_transaction(trans, root);
e6dcd2dc 2666 if (!err) {
a52d9a80 2667 err = ret;
e6dcd2dc 2668 }
a52d9a80 2669 }
a52d9a80
CM		 2670 if (err) {
2671 free_extent_map(em);
2672 WARN_ON(1);
2673 return ERR_PTR(err);
2674 }
2675 return em;
2676}
2677
e1c4b745 2678#if 0 /* waiting for O_DIRECT reads */
16432985
CM		 2679static int btrfs_get_block(struct inode *inode, sector_t iblock,
2680 struct buffer_head *bh_result, int create)
2681{
2682 struct extent_map *em;
2683 u64 start = (u64)iblock << inode->i_blkbits;
2684 struct btrfs_multi_bio *multi = NULL;
2685 struct btrfs_root *root = BTRFS_I(inode)->root;
2686 u64 len;
2687 u64 logical;
2688 u64 map_length;
2689 int ret = 0;
2690
2691 em = btrfs_get_extent(inode, NULL, 0, start, bh_result->b_size, 0);
2692
2693 if (!em || IS_ERR(em))
2694 goto out;
2695
e1c4b745 2696 if (em->start > start || em->start + em->len <= start) {
16432985 2697 goto out;
e1c4b745 2698 }
16432985
CM		 2699
2700 if (em->block_start == EXTENT_MAP_INLINE) {
2701 ret = -EINVAL;
2702 goto out;
2703 }
2704
e1c4b745
CM		 2705 len = em->start + em->len - start;
2706 len = min_t(u64, len, INT_LIMIT(typeof(bh_result->b_size)));
2707
16432985
CM		 2708 if (em->block_start == EXTENT_MAP_HOLE ||
2709 em->block_start == EXTENT_MAP_DELALLOC) {
e1c4b745 2710 bh_result->b_size = len;
16432985
CM		 2711 goto out;
2712 }
2713
16432985
CM		 2714 logical = start - em->start;
2715 logical = em->block_start + logical;
2716
2717 map_length = len;
2718 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
2719 logical, &map_length, &multi, 0);
2720 BUG_ON(ret);
2721 bh_result->b_blocknr = multi->stripes[0].physical >> inode->i_blkbits;
2722 bh_result->b_size = min(map_length, len);
e1c4b745 2723
16432985
CM		 2724 bh_result->b_bdev = multi->stripes[0].dev->bdev;
2725 set_buffer_mapped(bh_result);
2726 kfree(multi);
2727out:
2728 free_extent_map(em);
2729 return ret;
2730}
e1c4b745 2731#endif
16432985
CM		 2732
2733static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
2734 const struct iovec *iov, loff_t offset,
2735 unsigned long nr_segs)
2736{
e1c4b745
CM		 2737 return -EINVAL;
2738#if 0
16432985
CM		 2739 struct file *file = iocb->ki_filp;
2740 struct inode *inode = file->f_mapping->host;
2741
2742 if (rw == WRITE)
2743 return -EINVAL;
2744
2745 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
2746 offset, nr_segs, btrfs_get_block, NULL);
e1c4b745 2747#endif
16432985
CM		 2748}
2749
d396c6f5 2750static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
39279cc3 2751{
d396c6f5 2752 return extent_bmap(mapping, iblock, btrfs_get_extent);
39279cc3
CM		 2753}
2754
a52d9a80 2755int btrfs_readpage(struct file *file, struct page *page)
9ebefb18 2756{
d1310b2e
CM		 2757 struct extent_io_tree *tree;
2758 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80 2759 return extent_read_full_page(tree, page, btrfs_get_extent);
9ebefb18 2760}
1832a6d5 2761
a52d9a80 2762static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
39279cc3 2763{
d1310b2e 2764 struct extent_io_tree *tree;
b888db2b
CM		 2765
2766
2767 if (current->flags & PF_MEMALLOC) {
2768 redirty_page_for_writepage(wbc, page);
2769 unlock_page(page);
2770 return 0;
2771 }
d1310b2e 2772 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80 2773 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
9ebefb18
CM		 2774}
2775
f421950f
CM		 2776int btrfs_writepages(struct address_space *mapping,
2777 struct writeback_control *wbc)
b293f02e 2778{
d1310b2e
CM		 2779 struct extent_io_tree *tree;
2780 tree = &BTRFS_I(mapping->host)->io_tree;
b293f02e
CM		 2781 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2782}
2783
3ab2fb5a
CM		 2784static int
2785btrfs_readpages(struct file *file, struct address_space *mapping,
2786 struct list_head *pages, unsigned nr_pages)
2787{
d1310b2e
CM		 2788 struct extent_io_tree *tree;
2789 tree = &BTRFS_I(mapping->host)->io_tree;
3ab2fb5a
CM		 2790 return extent_readpages(tree, mapping, pages, nr_pages,
2791 btrfs_get_extent);
2792}
e6dcd2dc 2793static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags)
9ebefb18 2794{
d1310b2e
CM		 2795 struct extent_io_tree *tree;
2796 struct extent_map_tree *map;
a52d9a80 2797 int ret;
8c2383c3 2798
d1310b2e
CM		 2799 tree = &BTRFS_I(page->mapping->host)->io_tree;
2800 map = &BTRFS_I(page->mapping->host)->extent_tree;
70dec807 2801 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
a52d9a80
CM		 2802 if (ret == 1) {
2803 ClearPagePrivate(page);
2804 set_page_private(page, 0);
2805 page_cache_release(page);
39279cc3 2806 }
a52d9a80 2807 return ret;
39279cc3
CM		 2808}
2809
e6dcd2dc
CM		 2810static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
2811{
e6dcd2dc
CM		 2812 return __btrfs_releasepage(page, gfp_flags);
2813}
2814
a52d9a80 2815static void btrfs_invalidatepage(struct page *page, unsigned long offset)
39279cc3 2816{
d1310b2e 2817 struct extent_io_tree *tree;
e6dcd2dc
CM		 2818 struct btrfs_ordered_extent *ordered;
2819 u64 page_start = page_offset(page);
2820 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
39279cc3 2821
e6dcd2dc 2822 wait_on_page_writeback(page);
d1310b2e 2823 tree = &BTRFS_I(page->mapping->host)->io_tree;
e6dcd2dc
CM		 2824 if (offset) {
2825 btrfs_releasepage(page, GFP_NOFS);
2826 return;
2827 }
2828
2829 lock_extent(tree, page_start, page_end, GFP_NOFS);
2830 ordered = btrfs_lookup_ordered_extent(page->mapping->host,
2831 page_offset(page));
2832 if (ordered) {
eb84ae03
CM		 2833 /*
2834 * IO on this page will never be started, so we need
2835 * to account for any ordered extents now
2836 */
e6dcd2dc
CM		 2837 clear_extent_bit(tree, page_start, page_end,
2838 EXTENT_DIRTY | EXTENT_DELALLOC |
2839 EXTENT_LOCKED, 1, 0, GFP_NOFS);
211f90e6
CM		 2840 btrfs_finish_ordered_io(page->mapping->host,
2841 page_start, page_end);
e6dcd2dc
CM		 2842 btrfs_put_ordered_extent(ordered);
2843 lock_extent(tree, page_start, page_end, GFP_NOFS);
2844 }
2845 clear_extent_bit(tree, page_start, page_end,
2846 EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC |
2847 EXTENT_ORDERED,
2848 1, 1, GFP_NOFS);
2849 __btrfs_releasepage(page, GFP_NOFS);
2850
4a096752 2851 ClearPageChecked(page);
9ad6b7bc 2852 if (PagePrivate(page)) {
9ad6b7bc
CM		 2853 ClearPagePrivate(page);
2854 set_page_private(page, 0);
2855 page_cache_release(page);
2856 }
39279cc3
CM		 2857}
2858
9ebefb18
CM		 2859/*
2860 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2861 * called from a page fault handler when a page is first dirtied. Hence we must
2862 * be careful to check for EOF conditions here. We set the page up correctly
2863 * for a written page which means we get ENOSPC checking when writing into
2864 * holes and correct delalloc and unwritten extent mapping on filesystems that
2865 * support these features.
2866 *
2867 * We are not allowed to take the i_mutex here so we have to play games to
2868 * protect against truncate races as the page could now be beyond EOF. Because
2869 * vmtruncate() writes the inode size before removing pages, once we have the
2870 * page lock we can determine safely if the page is beyond EOF. If it is not
2871 * beyond EOF, then the page is guaranteed safe against truncation until we
2872 * unlock the page.
2873 */
2874int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2875{
6da6abae 2876 struct inode *inode = fdentry(vma->vm_file)->d_inode;
1832a6d5 2877 struct btrfs_root *root = BTRFS_I(inode)->root;
e6dcd2dc
CM		 2878 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2879 struct btrfs_ordered_extent *ordered;
2880 char *kaddr;
2881 unsigned long zero_start;
9ebefb18 2882 loff_t size;
1832a6d5 2883 int ret;
a52d9a80 2884 u64 page_start;
e6dcd2dc 2885 u64 page_end;
9ebefb18 2886
1832a6d5 2887 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
1832a6d5
CM		 2888 if (ret)
2889 goto out;
2890
2891 ret = -EINVAL;
e6dcd2dc 2892again:
9ebefb18 2893 lock_page(page);
9ebefb18 2894 size = i_size_read(inode);
e6dcd2dc
CM		 2895 page_start = page_offset(page);
2896 page_end = page_start + PAGE_CACHE_SIZE - 1;
a52d9a80 2897
9ebefb18 2898 if ((page->mapping != inode->i_mapping) ||
e6dcd2dc 2899 (page_start >= size)) {
9ebefb18
CM		 2900 /* page got truncated out from underneath us */
2901 goto out_unlock;
2902 }
e6dcd2dc
CM		 2903 wait_on_page_writeback(page);
2904
2905 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
2906 set_page_extent_mapped(page);
2907
eb84ae03
CM		 2908 /*
2909 * we can't set the delalloc bits if there are pending ordered
2910 * extents. Drop our locks and wait for them to finish
2911 */
e6dcd2dc
CM		 2912 ordered = btrfs_lookup_ordered_extent(inode, page_start);
2913 if (ordered) {
2914 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
2915 unlock_page(page);
eb84ae03 2916 btrfs_start_ordered_extent(inode, ordered, 1);
e6dcd2dc
CM		 2917 btrfs_put_ordered_extent(ordered);
2918 goto again;
2919 }
2920
2921 set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start,
2922 page_end, GFP_NOFS);
2923 ret = 0;
9ebefb18
CM		 2924
2925 /* page is wholly or partially inside EOF */
a52d9a80 2926 if (page_start + PAGE_CACHE_SIZE > size)
e6dcd2dc 2927 zero_start = size & ~PAGE_CACHE_MASK;
9ebefb18 2928 else
e6dcd2dc 2929 zero_start = PAGE_CACHE_SIZE;
9ebefb18 2930
e6dcd2dc
CM		 2931 if (zero_start != PAGE_CACHE_SIZE) {
2932 kaddr = kmap(page);
2933 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
2934 flush_dcache_page(page);
2935 kunmap(page);
2936 }
247e743c 2937 ClearPageChecked(page);
e6dcd2dc
CM		 2938 set_page_dirty(page);
2939 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
9ebefb18
CM		 2940
2941out_unlock:
2942 unlock_page(page);
1832a6d5 2943out:
9ebefb18
CM		 2944 return ret;
2945}
2946
39279cc3
CM		 2947static void btrfs_truncate(struct inode *inode)
2948{
2949 struct btrfs_root *root = BTRFS_I(inode)->root;
2950 int ret;
2951 struct btrfs_trans_handle *trans;
d3c2fdcf 2952 unsigned long nr;
dbe674a9 2953 u64 mask = root->sectorsize - 1;
39279cc3
CM		 2954
2955 if (!S_ISREG(inode->i_mode))
2956 return;
2957 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2958 return;
2959
2960 btrfs_truncate_page(inode->i_mapping, inode->i_size);
4a096752 2961 btrfs_wait_ordered_range(inode, inode->i_size & (~mask), (u64)-1);
39279cc3 2962
39279cc3
CM		 2963 trans = btrfs_start_transaction(root, 1);
2964 btrfs_set_trans_block_group(trans, inode);
dbe674a9 2965 btrfs_i_size_write(inode, inode->i_size);
39279cc3
CM		 2966
2967 /* FIXME, add redo link to tree so we don't leak on crash */
85e21bac
CM		 2968 ret = btrfs_truncate_in_trans(trans, root, inode,
2969 BTRFS_EXTENT_DATA_KEY);
39279cc3 2970 btrfs_update_inode(trans, root, inode);
d3c2fdcf 2971 nr = trans->blocks_used;
5f39d397 2972
89ce8a63 2973 ret = btrfs_end_transaction_throttle(trans, root);
39279cc3 2974 BUG_ON(ret);
d3c2fdcf 2975 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 2976}
2977
3b96362c
SW		 2978/*
2979 * Invalidate a single dcache entry at the root of the filesystem.
2980 * Needed after creation of snapshot or subvolume.
2981 */
2982void btrfs_invalidate_dcache_root(struct btrfs_root *root, char *name,
2983 int namelen)
2984{
2985 struct dentry *alias, *entry;
2986 struct qstr qstr;
2987
2988 alias = d_find_alias(root->fs_info->sb->s_root->d_inode);
2989 if (alias) {
2990 qstr.name = name;
2991 qstr.len = namelen;
2992 /* change me if btrfs ever gets a d_hash operation */
2993 qstr.hash = full_name_hash(qstr.name, qstr.len);
2994 entry = d_lookup(alias, &qstr);
2995 dput(alias);
2996 if (entry) {
2997 d_invalidate(entry);
2998 dput(entry);
2999 }
3000 }
3001}
3002
f46b5a66
CH		 3003int btrfs_create_subvol_root(struct btrfs_root *new_root,
3004 struct btrfs_trans_handle *trans, u64 new_dirid,
3005 struct btrfs_block_group_cache *block_group)
39279cc3 3006{
39279cc3 3007 struct inode *inode;
39279cc3 3008
aec7477b 3009 inode = btrfs_new_inode(trans, new_root, NULL, "..", 2, new_dirid,
f46b5a66 3010 new_dirid, block_group, S_IFDIR | 0700);
54aa1f4d 3011 if (IS_ERR(inode))
f46b5a66 3012 return PTR_ERR(inode);
39279cc3
CM		 3013 inode->i_op = &btrfs_dir_inode_operations;
3014 inode->i_fop = &btrfs_dir_file_operations;
34088780 3015 new_root->inode = inode;
39279cc3 3016
39279cc3 3017 inode->i_nlink = 1;
dbe674a9 3018 btrfs_i_size_write(inode, 0);
3b96362c 3019
f46b5a66 3020 return btrfs_update_inode(trans, new_root, inode);
39279cc3
CM		 3021}
3022
edbd8d4e 3023unsigned long btrfs_force_ra(struct address_space *mapping,
86479a04
CM		 3024 struct file_ra_state *ra, struct file *file,
3025 pgoff_t offset, pgoff_t last_index)
3026{
8e7bf94f 3027 pgoff_t req_size = last_index - offset + 1;
86479a04
CM		 3028
3029#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
86479a04
CM		 3030 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
3031 return offset;
3032#else
86479a04
CM		 3033 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
3034 return offset + req_size;
3035#endif
3036}
3037
39279cc3
CM		 3038struct inode *btrfs_alloc_inode(struct super_block *sb)
3039{
3040 struct btrfs_inode *ei;
3041
3042 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
3043 if (!ei)
3044 return NULL;
15ee9bc7 3045 ei->last_trans = 0;
e6dcd2dc 3046 btrfs_ordered_inode_tree_init(&ei->ordered_tree);
33268eaf
JB		 3047 ei->i_acl = BTRFS_ACL_NOT_CACHED;
3048 ei->i_default_acl = BTRFS_ACL_NOT_CACHED;
39279cc3
CM		 3049 return &ei->vfs_inode;
3050}
3051
3052void btrfs_destroy_inode(struct inode *inode)
3053{
e6dcd2dc 3054 struct btrfs_ordered_extent *ordered;
39279cc3
CM		 3055 WARN_ON(!list_empty(&inode->i_dentry));
3056 WARN_ON(inode->i_data.nrpages);
3057
33268eaf
JB		 3058 if (BTRFS_I(inode)->i_acl &&
3059 BTRFS_I(inode)->i_acl != BTRFS_ACL_NOT_CACHED)
3060 posix_acl_release(BTRFS_I(inode)->i_acl);
3061 if (BTRFS_I(inode)->i_default_acl &&
3062 BTRFS_I(inode)->i_default_acl != BTRFS_ACL_NOT_CACHED)
3063 posix_acl_release(BTRFS_I(inode)->i_default_acl);
3064
e6dcd2dc
CM		 3065 while(1) {
3066 ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1);
3067 if (!ordered)
3068 break;
3069 else {
3070 printk("found ordered extent %Lu %Lu\n",
3071 ordered->file_offset, ordered->len);
3072 btrfs_remove_ordered_extent(inode, ordered);
3073 btrfs_put_ordered_extent(ordered);
3074 btrfs_put_ordered_extent(ordered);
3075 }
3076 }
8c416c9e 3077 btrfs_drop_extent_cache(inode, 0, (u64)-1);
39279cc3
CM		 3078 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
3079}
3080
44ec0b71
CM		 3081#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
3082static void init_once(struct kmem_cache * cachep, void *foo)
3083#else
39279cc3
CM		 3084static void init_once(void * foo, struct kmem_cache * cachep,
3085 unsigned long flags)
44ec0b71 3086#endif
39279cc3
CM		 3087{
3088 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
3089
3090 inode_init_once(&ei->vfs_inode);
3091}
3092
3093void btrfs_destroy_cachep(void)
3094{
3095 if (btrfs_inode_cachep)
3096 kmem_cache_destroy(btrfs_inode_cachep);
3097 if (btrfs_trans_handle_cachep)
3098 kmem_cache_destroy(btrfs_trans_handle_cachep);
3099 if (btrfs_transaction_cachep)
3100 kmem_cache_destroy(btrfs_transaction_cachep);
3101 if (btrfs_bit_radix_cachep)
3102 kmem_cache_destroy(btrfs_bit_radix_cachep);
3103 if (btrfs_path_cachep)
3104 kmem_cache_destroy(btrfs_path_cachep);
3105}
3106
86479a04 3107struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
92fee66d 3108 unsigned long extra_flags,
44ec0b71
CM		 3109#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
3110 void (*ctor)(struct kmem_cache *, void *)
3111#else
92fee66d 3112 void (*ctor)(void *, struct kmem_cache *,
44ec0b71
CM		 3113 unsigned long)
3114#endif
3115 )
92fee66d
CM		 3116{
3117 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
3118 SLAB_MEM_SPREAD | extra_flags), ctor
3119#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
3120 ,NULL
3121#endif
3122 );
3123}
3124
39279cc3
CM		 3125int btrfs_init_cachep(void)
3126{
86479a04 3127 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
92fee66d
CM		 3128 sizeof(struct btrfs_inode),
3129 0, init_once);
39279cc3
CM		 3130 if (!btrfs_inode_cachep)
3131 goto fail;
86479a04
CM		 3132 btrfs_trans_handle_cachep =
3133 btrfs_cache_create("btrfs_trans_handle_cache",
3134 sizeof(struct btrfs_trans_handle),
3135 0, NULL);
39279cc3
CM		 3136 if (!btrfs_trans_handle_cachep)
3137 goto fail;
86479a04 3138 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
39279cc3 3139 sizeof(struct btrfs_transaction),
92fee66d 3140 0, NULL);
39279cc3
CM		 3141 if (!btrfs_transaction_cachep)
3142 goto fail;
86479a04 3143 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
23223584 3144 sizeof(struct btrfs_path),
92fee66d 3145 0, NULL);
39279cc3
CM		 3146 if (!btrfs_path_cachep)
3147 goto fail;
86479a04 3148 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
92fee66d 3149 SLAB_DESTROY_BY_RCU, NULL);
39279cc3
CM		 3150 if (!btrfs_bit_radix_cachep)
3151 goto fail;
3152 return 0;
3153fail:
3154 btrfs_destroy_cachep();
3155 return -ENOMEM;
3156}
3157
3158static int btrfs_getattr(struct vfsmount *mnt,
3159 struct dentry *dentry, struct kstat *stat)
3160{
3161 struct inode *inode = dentry->d_inode;
3162 generic_fillattr(inode, stat);
d6667462 3163 stat->blksize = PAGE_CACHE_SIZE;
9069218d 3164 stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9);
39279cc3
CM		 3165 return 0;
3166}
3167
3168static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
3169 struct inode * new_dir,struct dentry *new_dentry)
3170{
3171 struct btrfs_trans_handle *trans;
3172 struct btrfs_root *root = BTRFS_I(old_dir)->root;
3173 struct inode *new_inode = new_dentry->d_inode;
3174 struct inode *old_inode = old_dentry->d_inode;
3175 struct timespec ctime = CURRENT_TIME;
39279cc3
CM		 3176 int ret;
3177
3178 if (S_ISDIR(old_inode->i_mode) && new_inode &&
3179 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
3180 return -ENOTEMPTY;
3181 }
5f39d397 3182
1832a6d5
CM		 3183 ret = btrfs_check_free_space(root, 1, 0);
3184 if (ret)
3185 goto out_unlock;
3186
39279cc3 3187 trans = btrfs_start_transaction(root, 1);
5f39d397 3188
39279cc3 3189 btrfs_set_trans_block_group(trans, new_dir);
39279cc3
CM		 3190
3191 old_dentry->d_inode->i_nlink++;
3192 old_dir->i_ctime = old_dir->i_mtime = ctime;
3193 new_dir->i_ctime = new_dir->i_mtime = ctime;
3194 old_inode->i_ctime = ctime;
5f39d397 3195
39279cc3
CM		 3196 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
3197 if (ret)
3198 goto out_fail;
3199
3200 if (new_inode) {
3201 new_inode->i_ctime = CURRENT_TIME;
3202 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
3203 if (ret)
3204 goto out_fail;
39279cc3 3205 }
aec7477b
JB		 3206 ret = btrfs_set_inode_index(new_dir, old_inode);
3207 if (ret)
3208 goto out_fail;
3209
9c58309d 3210 ret = btrfs_add_link(trans, new_dentry, old_inode, 1);
39279cc3
CM		 3211 if (ret)
3212 goto out_fail;
3213
3214out_fail:
39279cc3 3215 btrfs_end_transaction(trans, root);
1832a6d5 3216out_unlock:
39279cc3
CM		 3217 return ret;
3218}
3219
3220static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
3221 const char *symname)
3222{
3223 struct btrfs_trans_handle *trans;
3224 struct btrfs_root *root = BTRFS_I(dir)->root;
3225 struct btrfs_path *path;
3226 struct btrfs_key key;
1832a6d5 3227 struct inode *inode = NULL;
39279cc3
CM		 3228 int err;
3229 int drop_inode = 0;
3230 u64 objectid;
3231 int name_len;
3232 int datasize;
5f39d397 3233 unsigned long ptr;
39279cc3 3234 struct btrfs_file_extent_item *ei;
5f39d397 3235 struct extent_buffer *leaf;
1832a6d5 3236 unsigned long nr = 0;
39279cc3
CM		 3237
3238 name_len = strlen(symname) + 1;
3239 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
3240 return -ENAMETOOLONG;
1832a6d5 3241
1832a6d5
CM		 3242 err = btrfs_check_free_space(root, 1, 0);
3243 if (err)
3244 goto out_fail;
3245
39279cc3
CM		 3246 trans = btrfs_start_transaction(root, 1);
3247 btrfs_set_trans_block_group(trans, dir);
3248
3249 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
3250 if (err) {
3251 err = -ENOSPC;
3252 goto out_unlock;
3253 }
3254
aec7477b 3255 inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
9c58309d
CM		 3256 dentry->d_name.len,
3257 dentry->d_parent->d_inode->i_ino, objectid,
39279cc3
CM		 3258 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
3259 err = PTR_ERR(inode);
3260 if (IS_ERR(inode))
3261 goto out_unlock;
3262
33268eaf
JB		 3263 err = btrfs_init_acl(inode, dir);
3264 if (err) {
3265 drop_inode = 1;
3266 goto out_unlock;
3267 }
3268
39279cc3 3269 btrfs_set_trans_block_group(trans, inode);
9c58309d 3270 err = btrfs_add_nondir(trans, dentry, inode, 0);
39279cc3
CM		 3271 if (err)
3272 drop_inode = 1;
3273 else {
3274 inode->i_mapping->a_ops = &btrfs_aops;
04160088 3275 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
39279cc3
CM		 3276 inode->i_fop = &btrfs_file_operations;
3277 inode->i_op = &btrfs_file_inode_operations;
d1310b2e
CM		 3278 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
3279 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
a52d9a80 3280 inode->i_mapping, GFP_NOFS);
7e38326f
CM		 3281 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
3282 inode->i_mapping, GFP_NOFS);
1b1e2135 3283 mutex_init(&BTRFS_I(inode)->csum_mutex);
ee6e6504 3284 mutex_init(&BTRFS_I(inode)->extent_mutex);
9069218d 3285 BTRFS_I(inode)->delalloc_bytes = 0;
dbe674a9 3286 BTRFS_I(inode)->disk_i_size = 0;
d1310b2e 3287 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
ba1da2f4 3288 btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree);
39279cc3
CM		 3289 }
3290 dir->i_sb->s_dirt = 1;
3291 btrfs_update_inode_block_group(trans, inode);
3292 btrfs_update_inode_block_group(trans, dir);
3293 if (drop_inode)
3294 goto out_unlock;
3295
3296 path = btrfs_alloc_path();
3297 BUG_ON(!path);
3298 key.objectid = inode->i_ino;
3299 key.offset = 0;
39279cc3
CM		 3300 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
3301 datasize = btrfs_file_extent_calc_inline_size(name_len);
3302 err = btrfs_insert_empty_item(trans, root, path, &key,
3303 datasize);
54aa1f4d
CM		 3304 if (err) {
3305 drop_inode = 1;
3306 goto out_unlock;
3307 }
5f39d397
CM		 3308 leaf = path->nodes[0];
3309 ei = btrfs_item_ptr(leaf, path->slots[0],
3310 struct btrfs_file_extent_item);
3311 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
3312 btrfs_set_file_extent_type(leaf, ei,
39279cc3
CM		 3313 BTRFS_FILE_EXTENT_INLINE);
3314 ptr = btrfs_file_extent_inline_start(ei);
5f39d397
CM		 3315 write_extent_buffer(leaf, symname, ptr, name_len);
3316 btrfs_mark_buffer_dirty(leaf);
39279cc3 3317 btrfs_free_path(path);
5f39d397 3318
39279cc3
CM		 3319 inode->i_op = &btrfs_symlink_inode_operations;
3320 inode->i_mapping->a_ops = &btrfs_symlink_aops;
04160088 3321 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
dbe674a9 3322 btrfs_i_size_write(inode, name_len - 1);
54aa1f4d
CM		 3323 err = btrfs_update_inode(trans, root, inode);
3324 if (err)
3325 drop_inode = 1;
39279cc3
CM		 3326
3327out_unlock:
d3c2fdcf 3328 nr = trans->blocks_used;
89ce8a63 3329 btrfs_end_transaction_throttle(trans, root);
1832a6d5 3330out_fail:
39279cc3
CM		 3331 if (drop_inode) {
3332 inode_dec_link_count(inode);
3333 iput(inode);
3334 }
d3c2fdcf 3335 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 3336 return err;
3337}
16432985 3338
e6dcd2dc
CM		 3339static int btrfs_set_page_dirty(struct page *page)
3340{
e6dcd2dc
CM		 3341 return __set_page_dirty_nobuffers(page);
3342}
3343
fdebe2bd
Y		 3344static int btrfs_permission(struct inode *inode, int mask,
3345 struct nameidata *nd)
3346{
3347 if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
3348 return -EACCES;
33268eaf 3349 return generic_permission(inode, mask, btrfs_check_acl);
fdebe2bd 3350}
39279cc3
CM		 3351
3352static struct inode_operations btrfs_dir_inode_operations = {
3353 .lookup = btrfs_lookup,
3354 .create = btrfs_create,
3355 .unlink = btrfs_unlink,
3356 .link = btrfs_link,
3357 .mkdir = btrfs_mkdir,
3358 .rmdir = btrfs_rmdir,
3359 .rename = btrfs_rename,
3360 .symlink = btrfs_symlink,
3361 .setattr = btrfs_setattr,
618e21d5 3362 .mknod = btrfs_mknod,
5103e947
JB		 3363 .setxattr = generic_setxattr,
3364 .getxattr = generic_getxattr,
3365 .listxattr = btrfs_listxattr,
3366 .removexattr = generic_removexattr,
fdebe2bd 3367 .permission = btrfs_permission,
39279cc3 3368};
39279cc3
CM		 3369static struct inode_operations btrfs_dir_ro_inode_operations = {
3370 .lookup = btrfs_lookup,
fdebe2bd 3371 .permission = btrfs_permission,
39279cc3 3372};
39279cc3
CM		 3373static struct file_operations btrfs_dir_file_operations = {
3374 .llseek = generic_file_llseek,
3375 .read = generic_read_dir,
3376 .readdir = btrfs_readdir,
34287aa3 3377 .unlocked_ioctl = btrfs_ioctl,
39279cc3 3378#ifdef CONFIG_COMPAT
34287aa3 3379 .compat_ioctl = btrfs_ioctl,
39279cc3 3380#endif
6bf13c0c 3381 .release = btrfs_release_file,
39279cc3
CM		 3382};
3383
d1310b2e 3384static struct extent_io_ops btrfs_extent_io_ops = {
07157aac 3385 .fill_delalloc = run_delalloc_range,
065631f6 3386 .submit_bio_hook = btrfs_submit_bio_hook,
239b14b3 3387 .merge_bio_hook = btrfs_merge_bio_hook,
07157aac
CM		 3388 .readpage_io_hook = btrfs_readpage_io_hook,
3389 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
e6dcd2dc 3390 .writepage_end_io_hook = btrfs_writepage_end_io_hook,
247e743c 3391 .writepage_start_hook = btrfs_writepage_start_hook,
1259ab75 3392 .readpage_io_failed_hook = btrfs_io_failed_hook,
b0c68f8b
CM		 3393 .set_bit_hook = btrfs_set_bit_hook,
3394 .clear_bit_hook = btrfs_clear_bit_hook,
07157aac
CM		 3395};
3396
39279cc3
CM		 3397static struct address_space_operations btrfs_aops = {
3398 .readpage = btrfs_readpage,
3399 .writepage = btrfs_writepage,
b293f02e 3400 .writepages = btrfs_writepages,
3ab2fb5a 3401 .readpages = btrfs_readpages,
39279cc3 3402 .sync_page = block_sync_page,
39279cc3 3403 .bmap = btrfs_bmap,
16432985 3404 .direct_IO = btrfs_direct_IO,
a52d9a80
CM		 3405 .invalidatepage = btrfs_invalidatepage,
3406 .releasepage = btrfs_releasepage,
e6dcd2dc 3407 .set_page_dirty = btrfs_set_page_dirty,
39279cc3
CM		 3408};
3409
3410static struct address_space_operations btrfs_symlink_aops = {
3411 .readpage = btrfs_readpage,
3412 .writepage = btrfs_writepage,
2bf5a725
CM		 3413 .invalidatepage = btrfs_invalidatepage,
3414 .releasepage = btrfs_releasepage,
39279cc3
CM		 3415};
3416
3417static struct inode_operations btrfs_file_inode_operations = {
3418 .truncate = btrfs_truncate,
3419 .getattr = btrfs_getattr,
3420 .setattr = btrfs_setattr,
5103e947
JB		 3421 .setxattr = generic_setxattr,
3422 .getxattr = generic_getxattr,
3423 .listxattr = btrfs_listxattr,
3424 .removexattr = generic_removexattr,
fdebe2bd 3425 .permission = btrfs_permission,
39279cc3 3426};
618e21d5
JB		 3427static struct inode_operations btrfs_special_inode_operations = {
3428 .getattr = btrfs_getattr,
3429 .setattr = btrfs_setattr,
fdebe2bd 3430 .permission = btrfs_permission,
33268eaf
JB		 3431 .setxattr = generic_setxattr,
3432 .getxattr = generic_getxattr,
3433 .listxattr = btrfs_listxattr,
3434 .removexattr = generic_removexattr,
618e21d5 3435};
39279cc3
CM		 3436static struct inode_operations btrfs_symlink_inode_operations = {
3437 .readlink = generic_readlink,
3438 .follow_link = page_follow_link_light,
3439 .put_link = page_put_link,
fdebe2bd 3440 .permission = btrfs_permission,
39279cc3 3441};
Linux 6.x block layer and io_uring tree(s)