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Btrfs: Run igrab on data=ordered inodes to prevent deadlocks during writeout
[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
39279cc3
CM		 19#include <linux/buffer_head.h>
20#include <linux/fs.h>
21#include <linux/pagemap.h>
22#include <linux/highmem.h>
23#include <linux/time.h>
24#include <linux/init.h>
25#include <linux/string.h>
26#include <linux/smp_lock.h>
27#include <linux/backing-dev.h>
28#include <linux/mpage.h>
29#include <linux/swap.h>
30#include <linux/writeback.h>
31#include <linux/statfs.h>
32#include <linux/compat.h>
9ebefb18 33#include <linux/bit_spinlock.h>
92fee66d 34#include <linux/version.h>
5103e947 35#include <linux/xattr.h>
39279cc3
CM		 36#include "ctree.h"
37#include "disk-io.h"
38#include "transaction.h"
39#include "btrfs_inode.h"
40#include "ioctl.h"
41#include "print-tree.h"
42
43struct btrfs_iget_args {
44 u64 ino;
45 struct btrfs_root *root;
46};
47
48static struct inode_operations btrfs_dir_inode_operations;
49static struct inode_operations btrfs_symlink_inode_operations;
50static struct inode_operations btrfs_dir_ro_inode_operations;
618e21d5 51static struct inode_operations btrfs_special_inode_operations;
39279cc3
CM		 52static struct inode_operations btrfs_file_inode_operations;
53static struct address_space_operations btrfs_aops;
54static struct address_space_operations btrfs_symlink_aops;
55static struct file_operations btrfs_dir_file_operations;
07157aac 56static struct extent_map_ops btrfs_extent_map_ops;
39279cc3
CM		 57
58static struct kmem_cache *btrfs_inode_cachep;
59struct kmem_cache *btrfs_trans_handle_cachep;
60struct kmem_cache *btrfs_transaction_cachep;
61struct kmem_cache *btrfs_bit_radix_cachep;
62struct kmem_cache *btrfs_path_cachep;
63
64#define S_SHIFT 12
65static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
66 [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
67 [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
68 [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
69 [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
70 [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
71 [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
72 [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
73};
74
1832a6d5
CM		 75int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
76 int for_del)
77{
78 u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy);
79 u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy);
80 u64 thresh;
81 int ret = 0;
82
9cce6c3b
CM		 83 return 0;
84
1832a6d5 85 if (for_del)
f9ef6604 86 thresh = total * 90;
1832a6d5 87 else
f9ef6604
CM		 88 thresh = total * 85;
89
90 do_div(thresh, 100);
1832a6d5
CM		 91
92 spin_lock(&root->fs_info->delalloc_lock);
93 if (used + root->fs_info->delalloc_bytes + num_required > thresh)
94 ret = -ENOSPC;
95 spin_unlock(&root->fs_info->delalloc_lock);
96 return ret;
97}
98
be20aa9d 99static int cow_file_range(struct inode *inode, u64 start, u64 end)
b888db2b
CM		 100{
101 struct btrfs_root *root = BTRFS_I(inode)->root;
102 struct btrfs_trans_handle *trans;
b888db2b 103 u64 alloc_hint = 0;
db94535d 104 u64 num_bytes;
c59f8951 105 u64 cur_alloc_size;
db94535d 106 u64 blocksize = root->sectorsize;
be20aa9d
CM		 107 struct btrfs_key ins;
108 int ret;
b888db2b 109
b888db2b 110 trans = btrfs_start_transaction(root, 1);
b888db2b 111 BUG_ON(!trans);
be20aa9d
CM		 112 btrfs_set_trans_block_group(trans, inode);
113
db94535d 114 num_bytes = (end - start + blocksize) & ~(blocksize - 1);
be20aa9d 115 num_bytes = max(blocksize, num_bytes);
b888db2b 116 ret = btrfs_drop_extents(trans, root, inode,
3326d1b0 117 start, start + num_bytes, start, &alloc_hint);
db94535d 118
179e29e4
CM		 119 if (alloc_hint == EXTENT_MAP_INLINE)
120 goto out;
121
c59f8951
CM		 122 while(num_bytes > 0) {
123 cur_alloc_size = min(num_bytes, root->fs_info->max_extent);
124 ret = btrfs_alloc_extent(trans, root, cur_alloc_size,
125 root->root_key.objectid,
126 trans->transid,
127 inode->i_ino, start, 0,
128 alloc_hint, (u64)-1, &ins, 1);
129 if (ret) {
130 WARN_ON(1);
131 goto out;
132 }
133 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
134 start, ins.objectid, ins.offset,
135 ins.offset);
136 num_bytes -= cur_alloc_size;
137 alloc_hint = ins.objectid + ins.offset;
138 start += cur_alloc_size;
b888db2b 139 }
dc17ff8f 140 btrfs_add_ordered_inode(inode);
b888db2b
CM		 141out:
142 btrfs_end_transaction(trans, root);
be20aa9d
CM		 143 return ret;
144}
145
146static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end)
147{
148 u64 extent_start;
149 u64 extent_end;
150 u64 bytenr;
151 u64 cow_end;
1832a6d5 152 u64 loops = 0;
c31f8830 153 u64 total_fs_bytes;
be20aa9d
CM		 154 struct btrfs_root *root = BTRFS_I(inode)->root;
155 struct extent_buffer *leaf;
156 int found_type;
157 struct btrfs_path *path;
158 struct btrfs_file_extent_item *item;
159 int ret;
160 int err;
161 struct btrfs_key found_key;
162
c31f8830 163 total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
be20aa9d
CM		 164 path = btrfs_alloc_path();
165 BUG_ON(!path);
166again:
167 ret = btrfs_lookup_file_extent(NULL, root, path,
168 inode->i_ino, start, 0);
169 if (ret < 0) {
170 btrfs_free_path(path);
171 return ret;
172 }
173
174 cow_end = end;
175 if (ret != 0) {
176 if (path->slots[0] == 0)
177 goto not_found;
178 path->slots[0]--;
179 }
180
181 leaf = path->nodes[0];
182 item = btrfs_item_ptr(leaf, path->slots[0],
183 struct btrfs_file_extent_item);
184
185 /* are we inside the extent that was found? */
186 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
187 found_type = btrfs_key_type(&found_key);
188 if (found_key.objectid != inode->i_ino ||
189 found_type != BTRFS_EXTENT_DATA_KEY) {
190 goto not_found;
191 }
192
193 found_type = btrfs_file_extent_type(leaf, item);
194 extent_start = found_key.offset;
195 if (found_type == BTRFS_FILE_EXTENT_REG) {
c31f8830
CM		 196 u64 extent_num_bytes;
197
198 extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item);
199 extent_end = extent_start + extent_num_bytes;
be20aa9d
CM		 200 err = 0;
201
1832a6d5
CM		 202 if (loops && start != extent_start)
203 goto not_found;
204
be20aa9d
CM		 205 if (start < extent_start || start >= extent_end)
206 goto not_found;
207
208 cow_end = min(end, extent_end - 1);
209 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
210 if (bytenr == 0)
211 goto not_found;
212
c31f8830
CM		 213 /*
214 * we may be called by the resizer, make sure we're inside
215 * the limits of the FS
216 */
217 if (bytenr + extent_num_bytes > total_fs_bytes)
218 goto not_found;
219
be20aa9d
CM		 220 if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) {
221 goto not_found;
222 }
223
224 start = extent_end;
bd09835d 225 } else {
be20aa9d
CM		 226 goto not_found;
227 }
228loop:
229 if (start > end) {
230 btrfs_free_path(path);
231 return 0;
232 }
233 btrfs_release_path(root, path);
1832a6d5 234 loops++;
be20aa9d
CM		 235 goto again;
236
237not_found:
238 cow_file_range(inode, start, cow_end);
239 start = cow_end + 1;
240 goto loop;
241}
242
243static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
244{
245 struct btrfs_root *root = BTRFS_I(inode)->root;
1832a6d5 246 u64 num_bytes;
be20aa9d 247 int ret;
be20aa9d 248 mutex_lock(&root->fs_info->fs_mutex);
b98b6767
Y		 249 if (btrfs_test_opt(root, NODATACOW) ||
250 btrfs_test_flag(inode, NODATACOW))
be20aa9d
CM		 251 ret = run_delalloc_nocow(inode, start, end);
252 else
253 ret = cow_file_range(inode, start, end);
1832a6d5
CM		 254
255 spin_lock(&root->fs_info->delalloc_lock);
256 num_bytes = end + 1 - start;
257 if (root->fs_info->delalloc_bytes < num_bytes) {
258 printk("delalloc accounting error total %llu sub %llu\n",
259 root->fs_info->delalloc_bytes, num_bytes);
260 } else {
261 root->fs_info->delalloc_bytes -= num_bytes;
262 }
263 spin_unlock(&root->fs_info->delalloc_lock);
264
b888db2b
CM		 265 mutex_unlock(&root->fs_info->fs_mutex);
266 return ret;
267}
268
07157aac
CM		 269int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end)
270{
271 struct inode *inode = page->mapping->host;
272 struct btrfs_root *root = BTRFS_I(inode)->root;
273 struct btrfs_trans_handle *trans;
274 char *kaddr;
b6cda9bc 275 int ret = 0;
35ebb934 276 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
07157aac 277 size_t offset = start - page_start;
b98b6767
Y		 278 if (btrfs_test_opt(root, NODATASUM) ||
279 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 280 return 0;
07157aac
CM		 281 mutex_lock(&root->fs_info->fs_mutex);
282 trans = btrfs_start_transaction(root, 1);
283 btrfs_set_trans_block_group(trans, inode);
284 kaddr = kmap(page);
f578d4bd 285 btrfs_csum_file_block(trans, root, inode, inode->i_ino,
07157aac
CM		 286 start, kaddr + offset, end - start + 1);
287 kunmap(page);
288 ret = btrfs_end_transaction(trans, root);
289 BUG_ON(ret);
290 mutex_unlock(&root->fs_info->fs_mutex);
291 return ret;
292}
293
294int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
295{
296 int ret = 0;
297 struct inode *inode = page->mapping->host;
298 struct btrfs_root *root = BTRFS_I(inode)->root;
299 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
300 struct btrfs_csum_item *item;
301 struct btrfs_path *path = NULL;
ff79f819 302 u32 csum;
b98b6767
Y		 303 if (btrfs_test_opt(root, NODATASUM) ||
304 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 305 return 0;
07157aac
CM		 306 mutex_lock(&root->fs_info->fs_mutex);
307 path = btrfs_alloc_path();
308 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
309 if (IS_ERR(item)) {
310 ret = PTR_ERR(item);
311 /* a csum that isn't present is a preallocated region. */
312 if (ret == -ENOENT || ret == -EFBIG)
313 ret = 0;
ff79f819 314 csum = 0;
07157aac
CM		 315 goto out;
316 }
ff79f819
CM		 317 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
318 BTRFS_CRC32_SIZE);
319 set_state_private(em_tree, start, csum);
07157aac
CM		 320out:
321 if (path)
322 btrfs_free_path(path);
323 mutex_unlock(&root->fs_info->fs_mutex);
324 return ret;
325}
326
327int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
328{
35ebb934 329 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
07157aac 330 struct inode *inode = page->mapping->host;
07157aac
CM		 331 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
332 char *kaddr;
333 u64 private;
334 int ret;
ff79f819
CM		 335 struct btrfs_root *root = BTRFS_I(inode)->root;
336 u32 csum = ~(u32)0;
bbf0d006 337 unsigned long flags;
b98b6767
Y		 338 if (btrfs_test_opt(root, NODATASUM) ||
339 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 340 return 0;
07157aac 341 ret = get_state_private(em_tree, start, &private);
bbf0d006 342 local_irq_save(flags);
07157aac
CM		 343 kaddr = kmap_atomic(page, KM_IRQ0);
344 if (ret) {
345 goto zeroit;
346 }
ff79f819
CM		 347 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
348 btrfs_csum_final(csum, (char *)&csum);
349 if (csum != private) {
07157aac
CM		 350 goto zeroit;
351 }
352 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 353 local_irq_restore(flags);
07157aac
CM		 354 return 0;
355
356zeroit:
357 printk("btrfs csum failed ino %lu off %llu\n",
358 page->mapping->host->i_ino, (unsigned long long)start);
db94535d
CM		 359 memset(kaddr + offset, 1, end - start + 1);
360 flush_dcache_page(page);
07157aac 361 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 362 local_irq_restore(flags);
07157aac
CM		 363 return 0;
364}
b888db2b 365
39279cc3
CM		 366void btrfs_read_locked_inode(struct inode *inode)
367{
368 struct btrfs_path *path;
5f39d397 369 struct extent_buffer *leaf;
39279cc3 370 struct btrfs_inode_item *inode_item;
5f39d397 371 struct btrfs_inode_timespec *tspec;
39279cc3
CM		 372 struct btrfs_root *root = BTRFS_I(inode)->root;
373 struct btrfs_key location;
374 u64 alloc_group_block;
618e21d5 375 u32 rdev;
39279cc3
CM		 376 int ret;
377
378 path = btrfs_alloc_path();
379 BUG_ON(!path);
39279cc3 380 mutex_lock(&root->fs_info->fs_mutex);
39279cc3 381 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
dc17ff8f 382
39279cc3 383 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
5f39d397 384 if (ret)
39279cc3 385 goto make_bad;
39279cc3 386
5f39d397
CM		 387 leaf = path->nodes[0];
388 inode_item = btrfs_item_ptr(leaf, path->slots[0],
389 struct btrfs_inode_item);
390
391 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
392 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
393 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
394 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
395 inode->i_size = btrfs_inode_size(leaf, inode_item);
396
397 tspec = btrfs_inode_atime(inode_item);
398 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
399 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
400
401 tspec = btrfs_inode_mtime(inode_item);
402 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
403 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
404
405 tspec = btrfs_inode_ctime(inode_item);
406 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
407 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
408
409 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
410 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
618e21d5 411 inode->i_rdev = 0;
5f39d397
CM		 412 rdev = btrfs_inode_rdev(leaf, inode_item);
413
414 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
39279cc3
CM		 415 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
416 alloc_group_block);
b98b6767 417 BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
e52ec0eb
CM		 418 if (!BTRFS_I(inode)->block_group) {
419 BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
420 NULL, 0, 0, 0);
421 }
39279cc3
CM		 422 btrfs_free_path(path);
423 inode_item = NULL;
424
425 mutex_unlock(&root->fs_info->fs_mutex);
426
427 switch (inode->i_mode & S_IFMT) {
39279cc3
CM		 428 case S_IFREG:
429 inode->i_mapping->a_ops = &btrfs_aops;
07157aac 430 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
39279cc3
CM		 431 inode->i_fop = &btrfs_file_operations;
432 inode->i_op = &btrfs_file_inode_operations;
433 break;
434 case S_IFDIR:
435 inode->i_fop = &btrfs_dir_file_operations;
436 if (root == root->fs_info->tree_root)
437 inode->i_op = &btrfs_dir_ro_inode_operations;
438 else
439 inode->i_op = &btrfs_dir_inode_operations;
440 break;
441 case S_IFLNK:
442 inode->i_op = &btrfs_symlink_inode_operations;
443 inode->i_mapping->a_ops = &btrfs_symlink_aops;
444 break;
618e21d5
JB		 445 default:
446 init_special_inode(inode, inode->i_mode, rdev);
447 break;
39279cc3
CM		 448 }
449 return;
450
451make_bad:
452 btrfs_release_path(root, path);
453 btrfs_free_path(path);
454 mutex_unlock(&root->fs_info->fs_mutex);
455 make_bad_inode(inode);
456}
457
5f39d397
CM		 458static void fill_inode_item(struct extent_buffer *leaf,
459 struct btrfs_inode_item *item,
39279cc3
CM		 460 struct inode *inode)
461{
5f39d397
CM		 462 btrfs_set_inode_uid(leaf, item, inode->i_uid);
463 btrfs_set_inode_gid(leaf, item, inode->i_gid);
464 btrfs_set_inode_size(leaf, item, inode->i_size);
465 btrfs_set_inode_mode(leaf, item, inode->i_mode);
466 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
467
468 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
469 inode->i_atime.tv_sec);
470 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
471 inode->i_atime.tv_nsec);
472
473 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
474 inode->i_mtime.tv_sec);
475 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
476 inode->i_mtime.tv_nsec);
477
478 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
479 inode->i_ctime.tv_sec);
480 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
481 inode->i_ctime.tv_nsec);
482
483 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
484 btrfs_set_inode_generation(leaf, item, inode->i_generation);
485 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
b98b6767 486 btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
5f39d397 487 btrfs_set_inode_block_group(leaf, item,
39279cc3
CM		 488 BTRFS_I(inode)->block_group->key.objectid);
489}
490
a52d9a80 491int btrfs_update_inode(struct btrfs_trans_handle *trans,
39279cc3
CM		 492 struct btrfs_root *root,
493 struct inode *inode)
494{
495 struct btrfs_inode_item *inode_item;
496 struct btrfs_path *path;
5f39d397 497 struct extent_buffer *leaf;
39279cc3
CM		 498 int ret;
499
500 path = btrfs_alloc_path();
501 BUG_ON(!path);
39279cc3
CM		 502 ret = btrfs_lookup_inode(trans, root, path,
503 &BTRFS_I(inode)->location, 1);
504 if (ret) {
505 if (ret > 0)
506 ret = -ENOENT;
507 goto failed;
508 }
509
5f39d397
CM		 510 leaf = path->nodes[0];
511 inode_item = btrfs_item_ptr(leaf, path->slots[0],
39279cc3
CM		 512 struct btrfs_inode_item);
513
5f39d397
CM		 514 fill_inode_item(leaf, inode_item, inode);
515 btrfs_mark_buffer_dirty(leaf);
15ee9bc7 516 btrfs_set_inode_last_trans(trans, inode);
39279cc3
CM		 517 ret = 0;
518failed:
519 btrfs_release_path(root, path);
520 btrfs_free_path(path);
521 return ret;
522}
523
524
525static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
526 struct btrfs_root *root,
527 struct inode *dir,
528 struct dentry *dentry)
529{
530 struct btrfs_path *path;
531 const char *name = dentry->d_name.name;
532 int name_len = dentry->d_name.len;
533 int ret = 0;
5f39d397 534 struct extent_buffer *leaf;
39279cc3 535 struct btrfs_dir_item *di;
5f39d397 536 struct btrfs_key key;
39279cc3
CM		 537
538 path = btrfs_alloc_path();
54aa1f4d
CM		 539 if (!path) {
540 ret = -ENOMEM;
541 goto err;
542 }
543
39279cc3
CM		 544 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
545 name, name_len, -1);
546 if (IS_ERR(di)) {
547 ret = PTR_ERR(di);
548 goto err;
549 }
550 if (!di) {
551 ret = -ENOENT;
552 goto err;
553 }
5f39d397
CM		 554 leaf = path->nodes[0];
555 btrfs_dir_item_key_to_cpu(leaf, di, &key);
39279cc3 556 ret = btrfs_delete_one_dir_name(trans, root, path, di);
54aa1f4d
CM		 557 if (ret)
558 goto err;
39279cc3
CM		 559 btrfs_release_path(root, path);
560
561 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
5f39d397 562 key.objectid, name, name_len, -1);
39279cc3
CM		 563 if (IS_ERR(di)) {
564 ret = PTR_ERR(di);
565 goto err;
566 }
567 if (!di) {
568 ret = -ENOENT;
569 goto err;
570 }
571 ret = btrfs_delete_one_dir_name(trans, root, path, di);
39279cc3
CM		 572
573 dentry->d_inode->i_ctime = dir->i_ctime;
76fea00a
CM		 574 ret = btrfs_del_inode_ref(trans, root, name, name_len,
575 dentry->d_inode->i_ino,
576 dentry->d_parent->d_inode->i_ino);
577 if (ret) {
578 printk("failed to delete reference to %.*s, "
579 "inode %lu parent %lu\n", name_len, name,
580 dentry->d_inode->i_ino,
581 dentry->d_parent->d_inode->i_ino);
3954401f 582 }
39279cc3
CM		 583err:
584 btrfs_free_path(path);
585 if (!ret) {
586 dir->i_size -= name_len * 2;
79c44584 587 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
39279cc3 588 btrfs_update_inode(trans, root, dir);
6da6abae
CM		 589#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
590 dentry->d_inode->i_nlink--;
591#else
39279cc3 592 drop_nlink(dentry->d_inode);
6da6abae 593#endif
54aa1f4d 594 ret = btrfs_update_inode(trans, root, dentry->d_inode);
39279cc3
CM		 595 dir->i_sb->s_dirt = 1;
596 }
597 return ret;
598}
599
600static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
601{
602 struct btrfs_root *root;
603 struct btrfs_trans_handle *trans;
2da98f00 604 struct inode *inode = dentry->d_inode;
39279cc3 605 int ret;
1832a6d5 606 unsigned long nr = 0;
39279cc3
CM		 607
608 root = BTRFS_I(dir)->root;
609 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 610
611 ret = btrfs_check_free_space(root, 1, 1);
612 if (ret)
613 goto fail;
614
39279cc3 615 trans = btrfs_start_transaction(root, 1);
5f39d397 616
39279cc3
CM		 617 btrfs_set_trans_block_group(trans, dir);
618 ret = btrfs_unlink_trans(trans, root, dir, dentry);
d3c2fdcf 619 nr = trans->blocks_used;
5f39d397 620
2da98f00
CM		 621 if (inode->i_nlink == 0) {
622 int found;
623 /* if the inode isn't linked anywhere,
624 * we don't need to worry about
625 * data=ordered
626 */
627 found = btrfs_del_ordered_inode(inode);
628 if (found == 1) {
629 atomic_dec(&inode->i_count);
630 }
631 }
632
39279cc3 633 btrfs_end_transaction(trans, root);
1832a6d5 634fail:
39279cc3 635 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 636 btrfs_btree_balance_dirty(root, nr);
e2008b61 637 btrfs_throttle(root);
39279cc3
CM		 638 return ret;
639}
640
641static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
642{
643 struct inode *inode = dentry->d_inode;
1832a6d5 644 int err = 0;
39279cc3
CM		 645 int ret;
646 struct btrfs_root *root = BTRFS_I(dir)->root;
39279cc3 647 struct btrfs_trans_handle *trans;
1832a6d5 648 unsigned long nr = 0;
39279cc3 649
134d4512
Y		 650 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
651 return -ENOTEMPTY;
652
39279cc3 653 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 654 ret = btrfs_check_free_space(root, 1, 1);
655 if (ret)
656 goto fail;
657
39279cc3
CM		 658 trans = btrfs_start_transaction(root, 1);
659 btrfs_set_trans_block_group(trans, dir);
39279cc3
CM		 660
661 /* now the directory is empty */
662 err = btrfs_unlink_trans(trans, root, dir, dentry);
663 if (!err) {
664 inode->i_size = 0;
665 }
3954401f 666
d3c2fdcf 667 nr = trans->blocks_used;
39279cc3 668 ret = btrfs_end_transaction(trans, root);
1832a6d5 669fail:
134d4512 670 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 671 btrfs_btree_balance_dirty(root, nr);
e2008b61 672 btrfs_throttle(root);
3954401f 673
39279cc3
CM		 674 if (ret && !err)
675 err = ret;
676 return err;
677}
678
679static int btrfs_free_inode(struct btrfs_trans_handle *trans,
680 struct btrfs_root *root,
681 struct inode *inode)
682{
683 struct btrfs_path *path;
684 int ret;
685
686 clear_inode(inode);
687
688 path = btrfs_alloc_path();
689 BUG_ON(!path);
39279cc3
CM		 690 ret = btrfs_lookup_inode(trans, root, path,
691 &BTRFS_I(inode)->location, -1);
54aa1f4d
CM		 692 if (ret > 0)
693 ret = -ENOENT;
694 if (!ret)
695 ret = btrfs_del_item(trans, root, path);
39279cc3
CM		 696 btrfs_free_path(path);
697 return ret;
698}
699
39279cc3
CM		 700/*
701 * this can truncate away extent items, csum items and directory items.
702 * It starts at a high offset and removes keys until it can't find
703 * any higher than i_size.
704 *
705 * csum items that cross the new i_size are truncated to the new size
706 * as well.
707 */
708static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
709 struct btrfs_root *root,
710 struct inode *inode)
711{
712 int ret;
713 struct btrfs_path *path;
714 struct btrfs_key key;
5f39d397 715 struct btrfs_key found_key;
39279cc3 716 u32 found_type;
5f39d397 717 struct extent_buffer *leaf;
39279cc3
CM		 718 struct btrfs_file_extent_item *fi;
719 u64 extent_start = 0;
db94535d 720 u64 extent_num_bytes = 0;
39279cc3 721 u64 item_end = 0;
7bb86316 722 u64 root_gen = 0;
d8d5f3e1 723 u64 root_owner = 0;
39279cc3
CM		 724 int found_extent;
725 int del_item;
179e29e4 726 int extent_type = -1;
39279cc3 727
a52d9a80 728 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
39279cc3 729 path = btrfs_alloc_path();
3c69faec 730 path->reada = -1;
39279cc3 731 BUG_ON(!path);
5f39d397 732
39279cc3
CM		 733 /* FIXME, add redo link to tree so we don't leak on crash */
734 key.objectid = inode->i_ino;
735 key.offset = (u64)-1;
5f39d397
CM		 736 key.type = (u8)-1;
737
39279cc3
CM		 738 while(1) {
739 btrfs_init_path(path);
740 fi = NULL;
741 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
742 if (ret < 0) {
743 goto error;
744 }
745 if (ret > 0) {
746 BUG_ON(path->slots[0] == 0);
747 path->slots[0]--;
748 }
5f39d397
CM		 749 leaf = path->nodes[0];
750 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
751 found_type = btrfs_key_type(&found_key);
39279cc3 752
5f39d397 753 if (found_key.objectid != inode->i_ino)
39279cc3 754 break;
5f39d397 755
39279cc3
CM		 756 if (found_type != BTRFS_CSUM_ITEM_KEY &&
757 found_type != BTRFS_DIR_ITEM_KEY &&
758 found_type != BTRFS_DIR_INDEX_KEY &&
759 found_type != BTRFS_EXTENT_DATA_KEY)
760 break;
761
5f39d397 762 item_end = found_key.offset;
39279cc3 763 if (found_type == BTRFS_EXTENT_DATA_KEY) {
5f39d397 764 fi = btrfs_item_ptr(leaf, path->slots[0],
39279cc3 765 struct btrfs_file_extent_item);
179e29e4
CM		 766 extent_type = btrfs_file_extent_type(leaf, fi);
767 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
5f39d397 768 item_end +=
db94535d 769 btrfs_file_extent_num_bytes(leaf, fi);
179e29e4
CM		 770 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
771 struct btrfs_item *item = btrfs_item_nr(leaf,
772 path->slots[0]);
773 item_end += btrfs_file_extent_inline_len(leaf,
774 item);
39279cc3 775 }
008630c1 776 item_end--;
39279cc3
CM		 777 }
778 if (found_type == BTRFS_CSUM_ITEM_KEY) {
779 ret = btrfs_csum_truncate(trans, root, path,
780 inode->i_size);
781 BUG_ON(ret);
782 }
008630c1 783 if (item_end < inode->i_size) {
b888db2b
CM		 784 if (found_type == BTRFS_DIR_ITEM_KEY) {
785 found_type = BTRFS_INODE_ITEM_KEY;
786 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
787 found_type = BTRFS_CSUM_ITEM_KEY;
788 } else if (found_type) {
789 found_type--;
790 } else {
791 break;
39279cc3 792 }
a61721d5 793 btrfs_set_key_type(&key, found_type);
65555a06 794 btrfs_release_path(root, path);
b888db2b 795 continue;
39279cc3 796 }
5f39d397 797 if (found_key.offset >= inode->i_size)
39279cc3
CM		 798 del_item = 1;
799 else
800 del_item = 0;
801 found_extent = 0;
802
803 /* FIXME, shrink the extent if the ref count is only 1 */
179e29e4
CM		 804 if (found_type != BTRFS_EXTENT_DATA_KEY)
805 goto delete;
806
807 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
39279cc3 808 u64 num_dec;
db94535d 809 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
39279cc3 810 if (!del_item) {
db94535d
CM		 811 u64 orig_num_bytes =
812 btrfs_file_extent_num_bytes(leaf, fi);
813 extent_num_bytes = inode->i_size -
5f39d397 814 found_key.offset + root->sectorsize - 1;
db94535d
CM		 815 btrfs_set_file_extent_num_bytes(leaf, fi,
816 extent_num_bytes);
817 num_dec = (orig_num_bytes -
818 extent_num_bytes) >> 9;
bab9fb03
Y		 819 if (extent_start != 0) {
820 inode->i_blocks -= num_dec;
821 }
5f39d397 822 btrfs_mark_buffer_dirty(leaf);
39279cc3 823 } else {
db94535d
CM		 824 extent_num_bytes =
825 btrfs_file_extent_disk_num_bytes(leaf,
826 fi);
39279cc3 827 /* FIXME blocksize != 4096 */
db94535d
CM		 828 num_dec = btrfs_file_extent_num_bytes(leaf,
829 fi) >> 9;
39279cc3
CM		 830 if (extent_start != 0) {
831 found_extent = 1;
832 inode->i_blocks -= num_dec;
833 }
d8d5f3e1
CM		 834 root_gen = btrfs_header_generation(leaf);
835 root_owner = btrfs_header_owner(leaf);
39279cc3 836 }
179e29e4
CM		 837 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE &&
838 !del_item) {
839 u32 newsize = inode->i_size - found_key.offset;
840 newsize = btrfs_file_extent_calc_inline_size(newsize);
841 ret = btrfs_truncate_item(trans, root, path,
842 newsize, 1);
843 BUG_ON(ret);
39279cc3 844 }
179e29e4 845delete:
39279cc3
CM		 846 if (del_item) {
847 ret = btrfs_del_item(trans, root, path);
54aa1f4d
CM		 848 if (ret)
849 goto error;
39279cc3
CM		 850 } else {
851 break;
852 }
853 btrfs_release_path(root, path);
854 if (found_extent) {
855 ret = btrfs_free_extent(trans, root, extent_start,
7bb86316 856 extent_num_bytes,
d8d5f3e1 857 root_owner,
7bb86316
CM		 858 root_gen, inode->i_ino,
859 found_key.offset, 0);
39279cc3
CM		 860 BUG_ON(ret);
861 }
862 }
863 ret = 0;
864error:
865 btrfs_release_path(root, path);
866 btrfs_free_path(path);
867 inode->i_sb->s_dirt = 1;
868 return ret;
869}
870
b888db2b 871static int btrfs_cow_one_page(struct inode *inode, struct page *page,
a52d9a80
CM		 872 size_t zero_start)
873{
874 char *kaddr;
b888db2b 875 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1832a6d5 876 struct btrfs_root *root = BTRFS_I(inode)->root;
35ebb934 877 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
b888db2b 878 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
1832a6d5
CM		 879 u64 existing_delalloc;
880 u64 delalloc_start;
881 int ret = 0;
a52d9a80 882
190662b2 883 WARN_ON(!PageLocked(page));
b3cfa35a 884 set_page_extent_mapped(page);
a52d9a80 885
b888db2b 886 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
1832a6d5
CM		 887 delalloc_start = page_start;
888 existing_delalloc = count_range_bits(&BTRFS_I(inode)->extent_tree,
889 &delalloc_start, page_end,
890 PAGE_CACHE_SIZE, EXTENT_DELALLOC);
b888db2b
CM		 891 set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start,
892 page_end, GFP_NOFS);
1832a6d5
CM		 893
894 spin_lock(&root->fs_info->delalloc_lock);
895 root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE - existing_delalloc;
896 spin_unlock(&root->fs_info->delalloc_lock);
897
a52d9a80 898 if (zero_start != PAGE_CACHE_SIZE) {
b888db2b 899 kaddr = kmap(page);
a52d9a80
CM		 900 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
901 flush_dcache_page(page);
b888db2b 902 kunmap(page);
a52d9a80 903 }
b888db2b
CM		 904 set_page_dirty(page);
905 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
a52d9a80 906
a52d9a80
CM		 907 return ret;
908}
909
39279cc3
CM		 910/*
911 * taken from block_truncate_page, but does cow as it zeros out
912 * any bytes left in the last page in the file.
913 */
914static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
915{
916 struct inode *inode = mapping->host;
db94535d
CM		 917 struct btrfs_root *root = BTRFS_I(inode)->root;
918 u32 blocksize = root->sectorsize;
39279cc3
CM		 919 pgoff_t index = from >> PAGE_CACHE_SHIFT;
920 unsigned offset = from & (PAGE_CACHE_SIZE-1);
921 struct page *page;
39279cc3 922 int ret = 0;
a52d9a80 923 u64 page_start;
39279cc3
CM		 924
925 if ((offset & (blocksize - 1)) == 0)
926 goto out;
927
928 ret = -ENOMEM;
929 page = grab_cache_page(mapping, index);
930 if (!page)
931 goto out;
39279cc3 932 if (!PageUptodate(page)) {
9ebefb18 933 ret = btrfs_readpage(NULL, page);
39279cc3
CM		 934 lock_page(page);
935 if (!PageUptodate(page)) {
936 ret = -EIO;
937 goto out;
938 }
939 }
35ebb934 940 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 941
b888db2b 942 ret = btrfs_cow_one_page(inode, page, offset);
39279cc3 943
39279cc3
CM		 944 unlock_page(page);
945 page_cache_release(page);
946out:
947 return ret;
948}
949
950static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
951{
952 struct inode *inode = dentry->d_inode;
953 int err;
954
955 err = inode_change_ok(inode, attr);
956 if (err)
957 return err;
958
959 if (S_ISREG(inode->i_mode) &&
960 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
961 struct btrfs_trans_handle *trans;
962 struct btrfs_root *root = BTRFS_I(inode)->root;
2bf5a725
CM		 963 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
964
5f39d397 965 u64 mask = root->sectorsize - 1;
39279cc3 966 u64 pos = (inode->i_size + mask) & ~mask;
2bf5a725 967 u64 block_end = attr->ia_size | mask;
39279cc3 968 u64 hole_size;
179e29e4 969 u64 alloc_hint = 0;
39279cc3
CM		 970
971 if (attr->ia_size <= pos)
972 goto out;
973
1832a6d5
CM		 974 mutex_lock(&root->fs_info->fs_mutex);
975 err = btrfs_check_free_space(root, 1, 0);
976 mutex_unlock(&root->fs_info->fs_mutex);
977 if (err)
978 goto fail;
979
39279cc3
CM		 980 btrfs_truncate_page(inode->i_mapping, inode->i_size);
981
2bf5a725 982 lock_extent(em_tree, pos, block_end, GFP_NOFS);
39279cc3 983 hole_size = (attr->ia_size - pos + mask) & ~mask;
39279cc3
CM		 984
985 mutex_lock(&root->fs_info->fs_mutex);
986 trans = btrfs_start_transaction(root, 1);
987 btrfs_set_trans_block_group(trans, inode);
2bf5a725 988 err = btrfs_drop_extents(trans, root, inode,
3326d1b0
CM		 989 pos, pos + hole_size, pos,
990 &alloc_hint);
2bf5a725 991
179e29e4
CM		 992 if (alloc_hint != EXTENT_MAP_INLINE) {
993 err = btrfs_insert_file_extent(trans, root,
994 inode->i_ino,
995 pos, 0, 0, hole_size);
996 }
39279cc3
CM		 997 btrfs_end_transaction(trans, root);
998 mutex_unlock(&root->fs_info->fs_mutex);
2bf5a725 999 unlock_extent(em_tree, pos, block_end, GFP_NOFS);
54aa1f4d
CM		 1000 if (err)
1001 return err;
39279cc3
CM		 1002 }
1003out:
1004 err = inode_setattr(inode, attr);
1832a6d5 1005fail:
39279cc3
CM		 1006 return err;
1007}
61295eb8 1008
2da98f00 1009void btrfs_put_inode(struct inode *inode)
61295eb8 1010{
2da98f00
CM		 1011 int ret;
1012
1013 if (!BTRFS_I(inode)->ordered_trans) {
61295eb8
CM		 1014 return;
1015 }
2da98f00
CM		 1016
1017 if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
1018 mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))
1019 return;
1020
1021 ret = btrfs_del_ordered_inode(inode);
1022 if (ret == 1) {
1023 atomic_dec(&inode->i_count);
1024 }
61295eb8
CM		 1025}
1026
39279cc3
CM		 1027void btrfs_delete_inode(struct inode *inode)
1028{
1029 struct btrfs_trans_handle *trans;
1030 struct btrfs_root *root = BTRFS_I(inode)->root;
d3c2fdcf 1031 unsigned long nr;
39279cc3
CM		 1032 int ret;
1033
1034 truncate_inode_pages(&inode->i_data, 0);
1035 if (is_bad_inode(inode)) {
1036 goto no_delete;
1037 }
5f39d397 1038
39279cc3
CM		 1039 inode->i_size = 0;
1040 mutex_lock(&root->fs_info->fs_mutex);
1041 trans = btrfs_start_transaction(root, 1);
5f39d397 1042
39279cc3
CM		 1043 btrfs_set_trans_block_group(trans, inode);
1044 ret = btrfs_truncate_in_trans(trans, root, inode);
5103e947
JB		 1045 if (ret)
1046 goto no_delete_lock;
1047 ret = btrfs_delete_xattrs(trans, root, inode);
54aa1f4d
CM		 1048 if (ret)
1049 goto no_delete_lock;
1050 ret = btrfs_free_inode(trans, root, inode);
1051 if (ret)
1052 goto no_delete_lock;
d3c2fdcf 1053 nr = trans->blocks_used;
5f39d397 1054
39279cc3
CM		 1055 btrfs_end_transaction(trans, root);
1056 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1057 btrfs_btree_balance_dirty(root, nr);
e2008b61 1058 btrfs_throttle(root);
39279cc3 1059 return;
54aa1f4d
CM		 1060
1061no_delete_lock:
d3c2fdcf 1062 nr = trans->blocks_used;
54aa1f4d
CM		 1063 btrfs_end_transaction(trans, root);
1064 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1065 btrfs_btree_balance_dirty(root, nr);
e2008b61 1066 btrfs_throttle(root);
39279cc3
CM		 1067no_delete:
1068 clear_inode(inode);
1069}
1070
1071/*
1072 * this returns the key found in the dir entry in the location pointer.
1073 * If no dir entries were found, location->objectid is 0.
1074 */
1075static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1076 struct btrfs_key *location)
1077{
1078 const char *name = dentry->d_name.name;
1079 int namelen = dentry->d_name.len;
1080 struct btrfs_dir_item *di;
1081 struct btrfs_path *path;
1082 struct btrfs_root *root = BTRFS_I(dir)->root;
0d9f7f3e 1083 int ret = 0;
39279cc3 1084
3954401f
CM		 1085 if (namelen == 1 && strcmp(name, ".") == 0) {
1086 location->objectid = dir->i_ino;
1087 location->type = BTRFS_INODE_ITEM_KEY;
1088 location->offset = 0;
1089 return 0;
1090 }
39279cc3
CM		 1091 path = btrfs_alloc_path();
1092 BUG_ON(!path);
3954401f 1093
7a720536 1094 if (namelen == 2 && strcmp(name, "..") == 0) {
3954401f
CM		 1095 struct btrfs_key key;
1096 struct extent_buffer *leaf;
1097 u32 nritems;
1098 int slot;
1099
1100 key.objectid = dir->i_ino;
1101 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1102 key.offset = 0;
1103 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1104 BUG_ON(ret == 0);
1105 ret = 0;
1106
1107 leaf = path->nodes[0];
1108 slot = path->slots[0];
1109 nritems = btrfs_header_nritems(leaf);
1110 if (slot >= nritems)
1111 goto out_err;
1112
1113 btrfs_item_key_to_cpu(leaf, &key, slot);
1114 if (key.objectid != dir->i_ino ||
1115 key.type != BTRFS_INODE_REF_KEY) {
1116 goto out_err;
1117 }
1118 location->objectid = key.offset;
1119 location->type = BTRFS_INODE_ITEM_KEY;
1120 location->offset = 0;
1121 goto out;
1122 }
1123
39279cc3
CM		 1124 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1125 namelen, 0);
0d9f7f3e
Y		 1126 if (IS_ERR(di))
1127 ret = PTR_ERR(di);
39279cc3 1128 if (!di || IS_ERR(di)) {
3954401f 1129 goto out_err;
39279cc3 1130 }
5f39d397 1131 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
39279cc3 1132out:
39279cc3
CM		 1133 btrfs_free_path(path);
1134 return ret;
3954401f
CM		 1135out_err:
1136 location->objectid = 0;
1137 goto out;
39279cc3
CM		 1138}
1139
1140/*
1141 * when we hit a tree root in a directory, the btrfs part of the inode
1142 * needs to be changed to reflect the root directory of the tree root. This
1143 * is kind of like crossing a mount point.
1144 */
1145static int fixup_tree_root_location(struct btrfs_root *root,
1146 struct btrfs_key *location,
58176a96
JB		 1147 struct btrfs_root **sub_root,
1148 struct dentry *dentry)
39279cc3
CM		 1149{
1150 struct btrfs_path *path;
1151 struct btrfs_root_item *ri;
1152
1153 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1154 return 0;
1155 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1156 return 0;
1157
1158 path = btrfs_alloc_path();
1159 BUG_ON(!path);
1160 mutex_lock(&root->fs_info->fs_mutex);
1161
58176a96
JB		 1162 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1163 dentry->d_name.name,
1164 dentry->d_name.len);
39279cc3
CM		 1165 if (IS_ERR(*sub_root))
1166 return PTR_ERR(*sub_root);
1167
1168 ri = &(*sub_root)->root_item;
1169 location->objectid = btrfs_root_dirid(ri);
39279cc3
CM		 1170 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1171 location->offset = 0;
1172
1173 btrfs_free_path(path);
1174 mutex_unlock(&root->fs_info->fs_mutex);
1175 return 0;
1176}
1177
1178static int btrfs_init_locked_inode(struct inode *inode, void *p)
1179{
1180 struct btrfs_iget_args *args = p;
1181 inode->i_ino = args->ino;
1182 BTRFS_I(inode)->root = args->root;
b888db2b
CM		 1183 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1184 inode->i_mapping, GFP_NOFS);
39279cc3
CM		 1185 return 0;
1186}
1187
1188static int btrfs_find_actor(struct inode *inode, void *opaque)
1189{
1190 struct btrfs_iget_args *args = opaque;
1191 return (args->ino == inode->i_ino &&
1192 args->root == BTRFS_I(inode)->root);
1193}
1194
dc17ff8f
CM		 1195struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1196 u64 root_objectid)
1197{
1198 struct btrfs_iget_args args;
1199 args.ino = objectid;
1200 args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);
1201
1202 if (!args.root)
1203 return NULL;
1204
1205 return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
1206}
1207
39279cc3
CM		 1208struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1209 struct btrfs_root *root)
1210{
1211 struct inode *inode;
1212 struct btrfs_iget_args args;
1213 args.ino = objectid;
1214 args.root = root;
1215
1216 inode = iget5_locked(s, objectid, btrfs_find_actor,
1217 btrfs_init_locked_inode,
1218 (void *)&args);
1219 return inode;
1220}
1221
1222static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1223 struct nameidata *nd)
1224{
1225 struct inode * inode;
1226 struct btrfs_inode *bi = BTRFS_I(dir);
1227 struct btrfs_root *root = bi->root;
1228 struct btrfs_root *sub_root = root;
1229 struct btrfs_key location;
1230 int ret;
1231
1232 if (dentry->d_name.len > BTRFS_NAME_LEN)
1233 return ERR_PTR(-ENAMETOOLONG);
5f39d397 1234
39279cc3
CM		 1235 mutex_lock(&root->fs_info->fs_mutex);
1236 ret = btrfs_inode_by_name(dir, dentry, &location);
1237 mutex_unlock(&root->fs_info->fs_mutex);
5f39d397 1238
39279cc3
CM		 1239 if (ret < 0)
1240 return ERR_PTR(ret);
5f39d397 1241
39279cc3
CM		 1242 inode = NULL;
1243 if (location.objectid) {
58176a96
JB		 1244 ret = fixup_tree_root_location(root, &location, &sub_root,
1245 dentry);
39279cc3
CM		 1246 if (ret < 0)
1247 return ERR_PTR(ret);
1248 if (ret > 0)
1249 return ERR_PTR(-ENOENT);
1250 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1251 sub_root);
1252 if (!inode)
1253 return ERR_PTR(-EACCES);
1254 if (inode->i_state & I_NEW) {
1255 /* the inode and parent dir are two different roots */
1256 if (sub_root != root) {
1257 igrab(inode);
1258 sub_root->inode = inode;
1259 }
1260 BTRFS_I(inode)->root = sub_root;
1261 memcpy(&BTRFS_I(inode)->location, &location,
1262 sizeof(location));
1263 btrfs_read_locked_inode(inode);
1264 unlock_new_inode(inode);
1265 }
1266 }
1267 return d_splice_alias(inode, dentry);
1268}
1269
39279cc3
CM		 1270static unsigned char btrfs_filetype_table[] = {
1271 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1272};
1273
1274static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1275{
6da6abae 1276 struct inode *inode = filp->f_dentry->d_inode;
39279cc3
CM		 1277 struct btrfs_root *root = BTRFS_I(inode)->root;
1278 struct btrfs_item *item;
1279 struct btrfs_dir_item *di;
1280 struct btrfs_key key;
5f39d397 1281 struct btrfs_key found_key;
39279cc3
CM		 1282 struct btrfs_path *path;
1283 int ret;
1284 u32 nritems;
5f39d397 1285 struct extent_buffer *leaf;
39279cc3
CM		 1286 int slot;
1287 int advance;
1288 unsigned char d_type;
1289 int over = 0;
1290 u32 di_cur;
1291 u32 di_total;
1292 u32 di_len;
1293 int key_type = BTRFS_DIR_INDEX_KEY;
5f39d397
CM		 1294 char tmp_name[32];
1295 char *name_ptr;
1296 int name_len;
39279cc3
CM		 1297
1298 /* FIXME, use a real flag for deciding about the key type */
1299 if (root->fs_info->tree_root == root)
1300 key_type = BTRFS_DIR_ITEM_KEY;
5f39d397 1301
3954401f
CM		 1302 /* special case for "." */
1303 if (filp->f_pos == 0) {
1304 over = filldir(dirent, ".", 1,
1305 1, inode->i_ino,
1306 DT_DIR);
1307 if (over)
1308 return 0;
1309 filp->f_pos = 1;
1310 }
1311
39279cc3
CM		 1312 mutex_lock(&root->fs_info->fs_mutex);
1313 key.objectid = inode->i_ino;
3954401f
CM		 1314 path = btrfs_alloc_path();
1315 path->reada = 2;
1316
1317 /* special case for .., just use the back ref */
1318 if (filp->f_pos == 1) {
1319 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1320 key.offset = 0;
1321 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1322 BUG_ON(ret == 0);
1323 leaf = path->nodes[0];
1324 slot = path->slots[0];
1325 nritems = btrfs_header_nritems(leaf);
1326 if (slot >= nritems) {
1327 btrfs_release_path(root, path);
1328 goto read_dir_items;
1329 }
1330 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1331 btrfs_release_path(root, path);
1332 if (found_key.objectid != key.objectid ||
1333 found_key.type != BTRFS_INODE_REF_KEY)
1334 goto read_dir_items;
1335 over = filldir(dirent, "..", 2,
1336 2, found_key.offset, DT_DIR);
1337 if (over)
1338 goto nopos;
1339 filp->f_pos = 2;
1340 }
1341
1342read_dir_items:
39279cc3
CM		 1343 btrfs_set_key_type(&key, key_type);
1344 key.offset = filp->f_pos;
5f39d397 1345
39279cc3
CM		 1346 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1347 if (ret < 0)
1348 goto err;
1349 advance = 0;
39279cc3 1350 while(1) {
5f39d397
CM		 1351 leaf = path->nodes[0];
1352 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1353 slot = path->slots[0];
1354 if (advance || slot >= nritems) {
1355 if (slot >= nritems -1) {
39279cc3
CM		 1356 ret = btrfs_next_leaf(root, path);
1357 if (ret)
1358 break;
5f39d397
CM		 1359 leaf = path->nodes[0];
1360 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1361 slot = path->slots[0];
1362 } else {
1363 slot++;
1364 path->slots[0]++;
1365 }
1366 }
1367 advance = 1;
5f39d397
CM		 1368 item = btrfs_item_nr(leaf, slot);
1369 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1370
1371 if (found_key.objectid != key.objectid)
39279cc3 1372 break;
5f39d397 1373 if (btrfs_key_type(&found_key) != key_type)
39279cc3 1374 break;
5f39d397 1375 if (found_key.offset < filp->f_pos)
39279cc3 1376 continue;
5f39d397
CM		 1377
1378 filp->f_pos = found_key.offset;
39279cc3
CM		 1379 advance = 1;
1380 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1381 di_cur = 0;
5f39d397 1382 di_total = btrfs_item_size(leaf, item);
39279cc3 1383 while(di_cur < di_total) {
5f39d397
CM		 1384 struct btrfs_key location;
1385
1386 name_len = btrfs_dir_name_len(leaf, di);
1387 if (name_len < 32) {
1388 name_ptr = tmp_name;
1389 } else {
1390 name_ptr = kmalloc(name_len, GFP_NOFS);
1391 BUG_ON(!name_ptr);
1392 }
1393 read_extent_buffer(leaf, name_ptr,
1394 (unsigned long)(di + 1), name_len);
1395
1396 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1397 btrfs_dir_item_key_to_cpu(leaf, di, &location);
5f39d397
CM		 1398 over = filldir(dirent, name_ptr, name_len,
1399 found_key.offset,
1400 location.objectid,
39279cc3 1401 d_type);
5f39d397
CM		 1402
1403 if (name_ptr != tmp_name)
1404 kfree(name_ptr);
1405
39279cc3
CM		 1406 if (over)
1407 goto nopos;
5103e947
JB		 1408 di_len = btrfs_dir_name_len(leaf, di) +
1409 btrfs_dir_data_len(leaf, di) +sizeof(*di);
39279cc3
CM		 1410 di_cur += di_len;
1411 di = (struct btrfs_dir_item *)((char *)di + di_len);
1412 }
1413 }
1414 filp->f_pos++;
1415nopos:
1416 ret = 0;
1417err:
1418 btrfs_release_path(root, path);
1419 btrfs_free_path(path);
1420 mutex_unlock(&root->fs_info->fs_mutex);
1421 return ret;
1422}
1423
1424int btrfs_write_inode(struct inode *inode, int wait)
1425{
1426 struct btrfs_root *root = BTRFS_I(inode)->root;
1427 struct btrfs_trans_handle *trans;
1428 int ret = 0;
1429
1430 if (wait) {
1431 mutex_lock(&root->fs_info->fs_mutex);
1432 trans = btrfs_start_transaction(root, 1);
1433 btrfs_set_trans_block_group(trans, inode);
1434 ret = btrfs_commit_transaction(trans, root);
1435 mutex_unlock(&root->fs_info->fs_mutex);
1436 }
1437 return ret;
1438}
1439
1440/*
54aa1f4d 1441 * This is somewhat expensive, updating the tree every time the
39279cc3
CM		 1442 * inode changes. But, it is most likely to find the inode in cache.
1443 * FIXME, needs more benchmarking...there are no reasons other than performance
1444 * to keep or drop this code.
1445 */
1446void btrfs_dirty_inode(struct inode *inode)
1447{
1448 struct btrfs_root *root = BTRFS_I(inode)->root;
1449 struct btrfs_trans_handle *trans;
1450
1451 mutex_lock(&root->fs_info->fs_mutex);
1452 trans = btrfs_start_transaction(root, 1);
1453 btrfs_set_trans_block_group(trans, inode);
1454 btrfs_update_inode(trans, root, inode);
1455 btrfs_end_transaction(trans, root);
1456 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 1457}
1458
1459static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1460 struct btrfs_root *root,
1461 u64 objectid,
1462 struct btrfs_block_group_cache *group,
1463 int mode)
1464{
1465 struct inode *inode;
5f39d397 1466 struct btrfs_inode_item *inode_item;
39279cc3 1467 struct btrfs_key *location;
5f39d397 1468 struct btrfs_path *path;
39279cc3
CM		 1469 int ret;
1470 int owner;
1471
5f39d397
CM		 1472 path = btrfs_alloc_path();
1473 BUG_ON(!path);
1474
39279cc3
CM		 1475 inode = new_inode(root->fs_info->sb);
1476 if (!inode)
1477 return ERR_PTR(-ENOMEM);
1478
b888db2b
CM		 1479 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1480 inode->i_mapping, GFP_NOFS);
39279cc3 1481 BTRFS_I(inode)->root = root;
b888db2b 1482
39279cc3
CM		 1483 if (mode & S_IFDIR)
1484 owner = 0;
1485 else
1486 owner = 1;
1487 group = btrfs_find_block_group(root, group, 0, 0, owner);
1488 BTRFS_I(inode)->block_group = group;
b98b6767 1489 BTRFS_I(inode)->flags = 0;
5f39d397
CM		 1490 ret = btrfs_insert_empty_inode(trans, root, path, objectid);
1491 if (ret)
1492 goto fail;
1493
39279cc3
CM		 1494 inode->i_uid = current->fsuid;
1495 inode->i_gid = current->fsgid;
1496 inode->i_mode = mode;
1497 inode->i_ino = objectid;
1498 inode->i_blocks = 0;
1499 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
5f39d397
CM		 1500 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1501 struct btrfs_inode_item);
1502 fill_inode_item(path->nodes[0], inode_item, inode);
1503 btrfs_mark_buffer_dirty(path->nodes[0]);
1504 btrfs_free_path(path);
1505
39279cc3
CM		 1506 location = &BTRFS_I(inode)->location;
1507 location->objectid = objectid;
39279cc3
CM		 1508 location->offset = 0;
1509 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1510
39279cc3
CM		 1511 insert_inode_hash(inode);
1512 return inode;
5f39d397
CM		 1513fail:
1514 btrfs_free_path(path);
1515 return ERR_PTR(ret);
39279cc3
CM		 1516}
1517
1518static inline u8 btrfs_inode_type(struct inode *inode)
1519{
1520 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1521}
1522
1523static int btrfs_add_link(struct btrfs_trans_handle *trans,
1524 struct dentry *dentry, struct inode *inode)
1525{
1526 int ret;
1527 struct btrfs_key key;
1528 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
79c44584 1529 struct inode *parent_inode;
5f39d397 1530
39279cc3 1531 key.objectid = inode->i_ino;
39279cc3
CM		 1532 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1533 key.offset = 0;
1534
1535 ret = btrfs_insert_dir_item(trans, root,
1536 dentry->d_name.name, dentry->d_name.len,
1537 dentry->d_parent->d_inode->i_ino,
1538 &key, btrfs_inode_type(inode));
1539 if (ret == 0) {
76fea00a
CM		 1540 ret = btrfs_insert_inode_ref(trans, root,
1541 dentry->d_name.name,
1542 dentry->d_name.len,
1543 inode->i_ino,
1544 dentry->d_parent->d_inode->i_ino);
79c44584
CM		 1545 parent_inode = dentry->d_parent->d_inode;
1546 parent_inode->i_size += dentry->d_name.len * 2;
1547 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
39279cc3
CM		 1548 ret = btrfs_update_inode(trans, root,
1549 dentry->d_parent->d_inode);
1550 }
1551 return ret;
1552}
1553
1554static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1555 struct dentry *dentry, struct inode *inode)
1556{
1557 int err = btrfs_add_link(trans, dentry, inode);
1558 if (!err) {
1559 d_instantiate(dentry, inode);
1560 return 0;
1561 }
1562 if (err > 0)
1563 err = -EEXIST;
1564 return err;
1565}
1566
618e21d5
JB		 1567static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1568 int mode, dev_t rdev)
1569{
1570 struct btrfs_trans_handle *trans;
1571 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1572 struct inode *inode = NULL;
618e21d5
JB		 1573 int err;
1574 int drop_inode = 0;
1575 u64 objectid;
1832a6d5 1576 unsigned long nr = 0;
618e21d5
JB		 1577
1578 if (!new_valid_dev(rdev))
1579 return -EINVAL;
1580
1581 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1582 err = btrfs_check_free_space(root, 1, 0);
1583 if (err)
1584 goto fail;
1585
618e21d5
JB		 1586 trans = btrfs_start_transaction(root, 1);
1587 btrfs_set_trans_block_group(trans, dir);
1588
1589 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1590 if (err) {
1591 err = -ENOSPC;
1592 goto out_unlock;
1593 }
1594
1595 inode = btrfs_new_inode(trans, root, objectid,
1596 BTRFS_I(dir)->block_group, mode);
1597 err = PTR_ERR(inode);
1598 if (IS_ERR(inode))
1599 goto out_unlock;
1600
1601 btrfs_set_trans_block_group(trans, inode);
1602 err = btrfs_add_nondir(trans, dentry, inode);
1603 if (err)
1604 drop_inode = 1;
1605 else {
1606 inode->i_op = &btrfs_special_inode_operations;
1607 init_special_inode(inode, inode->i_mode, rdev);
1b4ab1bb 1608 btrfs_update_inode(trans, root, inode);
618e21d5
JB		 1609 }
1610 dir->i_sb->s_dirt = 1;
1611 btrfs_update_inode_block_group(trans, inode);
1612 btrfs_update_inode_block_group(trans, dir);
1613out_unlock:
d3c2fdcf 1614 nr = trans->blocks_used;
618e21d5 1615 btrfs_end_transaction(trans, root);
1832a6d5 1616fail:
618e21d5
JB		 1617 mutex_unlock(&root->fs_info->fs_mutex);
1618
1619 if (drop_inode) {
1620 inode_dec_link_count(inode);
1621 iput(inode);
1622 }
d3c2fdcf 1623 btrfs_btree_balance_dirty(root, nr);
e2008b61 1624 btrfs_throttle(root);
618e21d5
JB		 1625 return err;
1626}
1627
39279cc3
CM		 1628static int btrfs_create(struct inode *dir, struct dentry *dentry,
1629 int mode, struct nameidata *nd)
1630{
1631 struct btrfs_trans_handle *trans;
1632 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1633 struct inode *inode = NULL;
39279cc3
CM		 1634 int err;
1635 int drop_inode = 0;
1832a6d5 1636 unsigned long nr = 0;
39279cc3
CM		 1637 u64 objectid;
1638
1639 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1640 err = btrfs_check_free_space(root, 1, 0);
1641 if (err)
1642 goto fail;
39279cc3
CM		 1643 trans = btrfs_start_transaction(root, 1);
1644 btrfs_set_trans_block_group(trans, dir);
1645
1646 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1647 if (err) {
1648 err = -ENOSPC;
1649 goto out_unlock;
1650 }
1651
1652 inode = btrfs_new_inode(trans, root, objectid,
1653 BTRFS_I(dir)->block_group, mode);
1654 err = PTR_ERR(inode);
1655 if (IS_ERR(inode))
1656 goto out_unlock;
1657
1658 btrfs_set_trans_block_group(trans, inode);
1659 err = btrfs_add_nondir(trans, dentry, inode);
1660 if (err)
1661 drop_inode = 1;
1662 else {
1663 inode->i_mapping->a_ops = &btrfs_aops;
1664 inode->i_fop = &btrfs_file_operations;
1665 inode->i_op = &btrfs_file_inode_operations;
a52d9a80
CM		 1666 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1667 inode->i_mapping, GFP_NOFS);
07157aac 1668 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
39279cc3
CM		 1669 }
1670 dir->i_sb->s_dirt = 1;
1671 btrfs_update_inode_block_group(trans, inode);
1672 btrfs_update_inode_block_group(trans, dir);
1673out_unlock:
d3c2fdcf 1674 nr = trans->blocks_used;
39279cc3 1675 btrfs_end_transaction(trans, root);
1832a6d5 1676fail:
39279cc3
CM		 1677 mutex_unlock(&root->fs_info->fs_mutex);
1678
1679 if (drop_inode) {
1680 inode_dec_link_count(inode);
1681 iput(inode);
1682 }
d3c2fdcf 1683 btrfs_btree_balance_dirty(root, nr);
e2008b61 1684 btrfs_throttle(root);
39279cc3
CM		 1685 return err;
1686}
1687
1688static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1689 struct dentry *dentry)
1690{
1691 struct btrfs_trans_handle *trans;
1692 struct btrfs_root *root = BTRFS_I(dir)->root;
1693 struct inode *inode = old_dentry->d_inode;
1832a6d5 1694 unsigned long nr = 0;
39279cc3
CM		 1695 int err;
1696 int drop_inode = 0;
1697
1698 if (inode->i_nlink == 0)
1699 return -ENOENT;
1700
6da6abae
CM		 1701#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1702 inode->i_nlink++;
1703#else
39279cc3 1704 inc_nlink(inode);
6da6abae 1705#endif
39279cc3 1706 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1707 err = btrfs_check_free_space(root, 1, 0);
1708 if (err)
1709 goto fail;
39279cc3 1710 trans = btrfs_start_transaction(root, 1);
5f39d397 1711
39279cc3
CM		 1712 btrfs_set_trans_block_group(trans, dir);
1713 atomic_inc(&inode->i_count);
1714 err = btrfs_add_nondir(trans, dentry, inode);
5f39d397 1715
39279cc3
CM		 1716 if (err)
1717 drop_inode = 1;
5f39d397 1718
39279cc3
CM		 1719 dir->i_sb->s_dirt = 1;
1720 btrfs_update_inode_block_group(trans, dir);
54aa1f4d 1721 err = btrfs_update_inode(trans, root, inode);
5f39d397 1722
54aa1f4d
CM		 1723 if (err)
1724 drop_inode = 1;
39279cc3 1725
d3c2fdcf 1726 nr = trans->blocks_used;
39279cc3 1727 btrfs_end_transaction(trans, root);
1832a6d5 1728fail:
39279cc3
CM		 1729 mutex_unlock(&root->fs_info->fs_mutex);
1730
1731 if (drop_inode) {
1732 inode_dec_link_count(inode);
1733 iput(inode);
1734 }
d3c2fdcf 1735 btrfs_btree_balance_dirty(root, nr);
e2008b61 1736 btrfs_throttle(root);
39279cc3
CM		 1737 return err;
1738}
1739
39279cc3
CM		 1740static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1741{
1742 struct inode *inode;
1743 struct btrfs_trans_handle *trans;
1744 struct btrfs_root *root = BTRFS_I(dir)->root;
1745 int err = 0;
1746 int drop_on_err = 0;
1747 u64 objectid;
d3c2fdcf 1748 unsigned long nr = 1;
39279cc3
CM		 1749
1750 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1751 err = btrfs_check_free_space(root, 1, 0);
1752 if (err)
1753 goto out_unlock;
1754
39279cc3
CM		 1755 trans = btrfs_start_transaction(root, 1);
1756 btrfs_set_trans_block_group(trans, dir);
5f39d397 1757
39279cc3
CM		 1758 if (IS_ERR(trans)) {
1759 err = PTR_ERR(trans);
1760 goto out_unlock;
1761 }
1762
1763 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1764 if (err) {
1765 err = -ENOSPC;
1766 goto out_unlock;
1767 }
1768
1769 inode = btrfs_new_inode(trans, root, objectid,
1770 BTRFS_I(dir)->block_group, S_IFDIR | mode);
1771 if (IS_ERR(inode)) {
1772 err = PTR_ERR(inode);
1773 goto out_fail;
1774 }
5f39d397 1775
39279cc3
CM		 1776 drop_on_err = 1;
1777 inode->i_op = &btrfs_dir_inode_operations;
1778 inode->i_fop = &btrfs_dir_file_operations;
1779 btrfs_set_trans_block_group(trans, inode);
1780
3954401f 1781 inode->i_size = 0;
39279cc3
CM		 1782 err = btrfs_update_inode(trans, root, inode);
1783 if (err)
1784 goto out_fail;
5f39d397 1785
39279cc3
CM		 1786 err = btrfs_add_link(trans, dentry, inode);
1787 if (err)
1788 goto out_fail;
5f39d397 1789
39279cc3
CM		 1790 d_instantiate(dentry, inode);
1791 drop_on_err = 0;
1792 dir->i_sb->s_dirt = 1;
1793 btrfs_update_inode_block_group(trans, inode);
1794 btrfs_update_inode_block_group(trans, dir);
1795
1796out_fail:
d3c2fdcf 1797 nr = trans->blocks_used;
39279cc3 1798 btrfs_end_transaction(trans, root);
5f39d397 1799
39279cc3
CM		 1800out_unlock:
1801 mutex_unlock(&root->fs_info->fs_mutex);
1802 if (drop_on_err)
1803 iput(inode);
d3c2fdcf 1804 btrfs_btree_balance_dirty(root, nr);
e2008b61 1805 btrfs_throttle(root);
39279cc3
CM		 1806 return err;
1807}
1808
a52d9a80
CM		 1809struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1810 size_t page_offset, u64 start, u64 end,
1811 int create)
1812{
1813 int ret;
1814 int err = 0;
db94535d 1815 u64 bytenr;
a52d9a80
CM		 1816 u64 extent_start = 0;
1817 u64 extent_end = 0;
1818 u64 objectid = inode->i_ino;
1819 u32 found_type;
1820 int failed_insert = 0;
1821 struct btrfs_path *path;
1822 struct btrfs_root *root = BTRFS_I(inode)->root;
1823 struct btrfs_file_extent_item *item;
5f39d397
CM		 1824 struct extent_buffer *leaf;
1825 struct btrfs_key found_key;
a52d9a80
CM		 1826 struct extent_map *em = NULL;
1827 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1828 struct btrfs_trans_handle *trans = NULL;
1829
1830 path = btrfs_alloc_path();
1831 BUG_ON(!path);
1832 mutex_lock(&root->fs_info->fs_mutex);
1833
1834again:
1835 em = lookup_extent_mapping(em_tree, start, end);
1836 if (em) {
56b453c9
CM		 1837 if (em->start > start) {
1838 printk("get_extent start %Lu em start %Lu\n",
1839 start, em->start);
1840 WARN_ON(1);
1841 }
a52d9a80
CM		 1842 goto out;
1843 }
1844 if (!em) {
1845 em = alloc_extent_map(GFP_NOFS);
1846 if (!em) {
1847 err = -ENOMEM;
1848 goto out;
1849 }
5f39d397
CM		 1850 em->start = EXTENT_MAP_HOLE;
1851 em->end = EXTENT_MAP_HOLE;
a52d9a80
CM		 1852 }
1853 em->bdev = inode->i_sb->s_bdev;
179e29e4
CM		 1854 ret = btrfs_lookup_file_extent(trans, root, path,
1855 objectid, start, trans != NULL);
a52d9a80
CM		 1856 if (ret < 0) {
1857 err = ret;
1858 goto out;
1859 }
1860
1861 if (ret != 0) {
1862 if (path->slots[0] == 0)
1863 goto not_found;
1864 path->slots[0]--;
1865 }
1866
5f39d397
CM		 1867 leaf = path->nodes[0];
1868 item = btrfs_item_ptr(leaf, path->slots[0],
a52d9a80 1869 struct btrfs_file_extent_item);
a52d9a80 1870 /* are we inside the extent that was found? */
5f39d397
CM		 1871 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1872 found_type = btrfs_key_type(&found_key);
1873 if (found_key.objectid != objectid ||
a52d9a80
CM		 1874 found_type != BTRFS_EXTENT_DATA_KEY) {
1875 goto not_found;
1876 }
1877
5f39d397
CM		 1878 found_type = btrfs_file_extent_type(leaf, item);
1879 extent_start = found_key.offset;
a52d9a80
CM		 1880 if (found_type == BTRFS_FILE_EXTENT_REG) {
1881 extent_end = extent_start +
db94535d 1882 btrfs_file_extent_num_bytes(leaf, item);
a52d9a80 1883 err = 0;
b888db2b 1884 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 1885 em->start = start;
1886 if (start < extent_start) {
b888db2b
CM		 1887 if (end < extent_start)
1888 goto not_found;
a52d9a80
CM		 1889 em->end = extent_end - 1;
1890 } else {
1891 em->end = end;
1892 }
1893 goto not_found_em;
1894 }
db94535d
CM		 1895 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
1896 if (bytenr == 0) {
a52d9a80
CM		 1897 em->start = extent_start;
1898 em->end = extent_end - 1;
5f39d397
CM		 1899 em->block_start = EXTENT_MAP_HOLE;
1900 em->block_end = EXTENT_MAP_HOLE;
a52d9a80
CM		 1901 goto insert;
1902 }
db94535d
CM		 1903 bytenr += btrfs_file_extent_offset(leaf, item);
1904 em->block_start = bytenr;
a52d9a80 1905 em->block_end = em->block_start +
db94535d 1906 btrfs_file_extent_num_bytes(leaf, item) - 1;
a52d9a80
CM		 1907 em->start = extent_start;
1908 em->end = extent_end - 1;
1909 goto insert;
1910 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
5f39d397 1911 unsigned long ptr;
a52d9a80 1912 char *map;
3326d1b0
CM		 1913 size_t size;
1914 size_t extent_offset;
1915 size_t copy_size;
a52d9a80 1916
5f39d397
CM		 1917 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
1918 path->slots[0]));
689f9346 1919 extent_end = (extent_start + size - 1) |
db94535d 1920 ((u64)root->sectorsize - 1);
b888db2b 1921 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 1922 em->start = start;
1923 if (start < extent_start) {
b888db2b
CM		 1924 if (end < extent_start)
1925 goto not_found;
50b78c24 1926 em->end = extent_end;
a52d9a80
CM		 1927 } else {
1928 em->end = end;
1929 }
1930 goto not_found_em;
1931 }
689f9346
Y		 1932 em->block_start = EXTENT_MAP_INLINE;
1933 em->block_end = EXTENT_MAP_INLINE;
1934
1935 if (!page) {
1936 em->start = extent_start;
1937 em->end = extent_start + size - 1;
1938 goto out;
1939 }
5f39d397 1940
35ebb934 1941 extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) -
689f9346 1942 extent_start + page_offset;
ae2f5411 1943 copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset,
3326d1b0 1944 size - extent_offset);
3326d1b0
CM		 1945 em->start = extent_start + extent_offset;
1946 em->end = (em->start + copy_size -1) |
1947 ((u64)root->sectorsize -1);
689f9346
Y		 1948 map = kmap(page);
1949 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
179e29e4
CM		 1950 if (create == 0 && !PageUptodate(page)) {
1951 read_extent_buffer(leaf, map + page_offset, ptr,
1952 copy_size);
1953 flush_dcache_page(page);
1954 } else if (create && PageUptodate(page)) {
1955 if (!trans) {
1956 kunmap(page);
1957 free_extent_map(em);
1958 em = NULL;
1959 btrfs_release_path(root, path);
1960 trans = btrfs_start_transaction(root, 1);
1961 goto again;
1962 }
1963 write_extent_buffer(leaf, map + page_offset, ptr,
1964 copy_size);
1965 btrfs_mark_buffer_dirty(leaf);
a52d9a80 1966 }
a52d9a80 1967 kunmap(page);
3326d1b0 1968 set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS);
a52d9a80
CM		 1969 goto insert;
1970 } else {
1971 printk("unkknown found_type %d\n", found_type);
1972 WARN_ON(1);
1973 }
1974not_found:
1975 em->start = start;
1976 em->end = end;
1977not_found_em:
5f39d397
CM		 1978 em->block_start = EXTENT_MAP_HOLE;
1979 em->block_end = EXTENT_MAP_HOLE;
a52d9a80
CM		 1980insert:
1981 btrfs_release_path(root, path);
1982 if (em->start > start || em->end < start) {
b888db2b 1983 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end);
a52d9a80
CM		 1984 err = -EIO;
1985 goto out;
1986 }
1987 ret = add_extent_mapping(em_tree, em);
1988 if (ret == -EEXIST) {
1989 free_extent_map(em);
2bf5a725 1990 em = NULL;
6da6abae
CM		 1991 if (0 && failed_insert == 1) {
1992 btrfs_drop_extent_cache(inode, start, end);
1993 }
a52d9a80
CM		 1994 failed_insert++;
1995 if (failed_insert > 5) {
1996 printk("failing to insert %Lu %Lu\n", start, end);
1997 err = -EIO;
1998 goto out;
1999 }
a52d9a80
CM		 2000 goto again;
2001 }
2002 err = 0;
2003out:
2004 btrfs_free_path(path);
2005 if (trans) {
2006 ret = btrfs_end_transaction(trans, root);
2007 if (!err)
2008 err = ret;
2009 }
2010 mutex_unlock(&root->fs_info->fs_mutex);
2011 if (err) {
2012 free_extent_map(em);
2013 WARN_ON(1);
2014 return ERR_PTR(err);
2015 }
2016 return em;
2017}
2018
d396c6f5 2019static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
39279cc3 2020{
d396c6f5 2021 return extent_bmap(mapping, iblock, btrfs_get_extent);
39279cc3
CM		 2022}
2023
a52d9a80 2024int btrfs_readpage(struct file *file, struct page *page)
9ebefb18 2025{
a52d9a80
CM		 2026 struct extent_map_tree *tree;
2027 tree = &BTRFS_I(page->mapping->host)->extent_tree;
2028 return extent_read_full_page(tree, page, btrfs_get_extent);
9ebefb18 2029}
1832a6d5 2030
a52d9a80 2031static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
39279cc3 2032{
a52d9a80 2033 struct extent_map_tree *tree;
b888db2b
CM		 2034
2035
2036 if (current->flags & PF_MEMALLOC) {
2037 redirty_page_for_writepage(wbc, page);
2038 unlock_page(page);
2039 return 0;
2040 }
a52d9a80
CM		 2041 tree = &BTRFS_I(page->mapping->host)->extent_tree;
2042 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
9ebefb18
CM		 2043}
2044
b293f02e
CM		 2045static int btrfs_writepages(struct address_space *mapping,
2046 struct writeback_control *wbc)
2047{
2048 struct extent_map_tree *tree;
2049 tree = &BTRFS_I(mapping->host)->extent_tree;
2050 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2051}
2052
3ab2fb5a
CM		 2053static int
2054btrfs_readpages(struct file *file, struct address_space *mapping,
2055 struct list_head *pages, unsigned nr_pages)
2056{
2057 struct extent_map_tree *tree;
2058 tree = &BTRFS_I(mapping->host)->extent_tree;
2059 return extent_readpages(tree, mapping, pages, nr_pages,
2060 btrfs_get_extent);
2061}
2062
a52d9a80 2063static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
9ebefb18 2064{
a52d9a80
CM		 2065 struct extent_map_tree *tree;
2066 int ret;
8c2383c3 2067
a52d9a80
CM		 2068 tree = &BTRFS_I(page->mapping->host)->extent_tree;
2069 ret = try_release_extent_mapping(tree, page);
2070 if (ret == 1) {
2071 ClearPagePrivate(page);
2072 set_page_private(page, 0);
2073 page_cache_release(page);
39279cc3 2074 }
a52d9a80 2075 return ret;
39279cc3
CM		 2076}
2077
a52d9a80 2078static void btrfs_invalidatepage(struct page *page, unsigned long offset)
39279cc3 2079{
a52d9a80 2080 struct extent_map_tree *tree;
39279cc3 2081
a52d9a80
CM		 2082 tree = &BTRFS_I(page->mapping->host)->extent_tree;
2083 extent_invalidatepage(tree, page, offset);
2084 btrfs_releasepage(page, GFP_NOFS);
39279cc3
CM		 2085}
2086
9ebefb18
CM		 2087/*
2088 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2089 * called from a page fault handler when a page is first dirtied. Hence we must
2090 * be careful to check for EOF conditions here. We set the page up correctly
2091 * for a written page which means we get ENOSPC checking when writing into
2092 * holes and correct delalloc and unwritten extent mapping on filesystems that
2093 * support these features.
2094 *
2095 * We are not allowed to take the i_mutex here so we have to play games to
2096 * protect against truncate races as the page could now be beyond EOF. Because
2097 * vmtruncate() writes the inode size before removing pages, once we have the
2098 * page lock we can determine safely if the page is beyond EOF. If it is not
2099 * beyond EOF, then the page is guaranteed safe against truncation until we
2100 * unlock the page.
2101 */
2102int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2103{
6da6abae 2104 struct inode *inode = fdentry(vma->vm_file)->d_inode;
1832a6d5 2105 struct btrfs_root *root = BTRFS_I(inode)->root;
9ebefb18
CM		 2106 unsigned long end;
2107 loff_t size;
1832a6d5 2108 int ret;
a52d9a80 2109 u64 page_start;
9ebefb18 2110
1832a6d5
CM		 2111 mutex_lock(&root->fs_info->fs_mutex);
2112 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
8f662a76 2113 mutex_unlock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2114 if (ret)
2115 goto out;
2116
2117 ret = -EINVAL;
2118
9ebefb18
CM		 2119 lock_page(page);
2120 wait_on_page_writeback(page);
9ebefb18 2121 size = i_size_read(inode);
35ebb934 2122 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 2123
9ebefb18 2124 if ((page->mapping != inode->i_mapping) ||
a52d9a80 2125 (page_start > size)) {
9ebefb18
CM		 2126 /* page got truncated out from underneath us */
2127 goto out_unlock;
2128 }
2129
2130 /* page is wholly or partially inside EOF */
a52d9a80 2131 if (page_start + PAGE_CACHE_SIZE > size)
9ebefb18
CM		 2132 end = size & ~PAGE_CACHE_MASK;
2133 else
2134 end = PAGE_CACHE_SIZE;
2135
b888db2b 2136 ret = btrfs_cow_one_page(inode, page, end);
9ebefb18
CM		 2137
2138out_unlock:
2139 unlock_page(page);
1832a6d5 2140out:
9ebefb18
CM		 2141 return ret;
2142}
2143
39279cc3
CM		 2144static void btrfs_truncate(struct inode *inode)
2145{
2146 struct btrfs_root *root = BTRFS_I(inode)->root;
2147 int ret;
2148 struct btrfs_trans_handle *trans;
d3c2fdcf 2149 unsigned long nr;
39279cc3
CM		 2150
2151 if (!S_ISREG(inode->i_mode))
2152 return;
2153 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2154 return;
2155
2156 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2157
2158 mutex_lock(&root->fs_info->fs_mutex);
2159 trans = btrfs_start_transaction(root, 1);
2160 btrfs_set_trans_block_group(trans, inode);
2161
2162 /* FIXME, add redo link to tree so we don't leak on crash */
2163 ret = btrfs_truncate_in_trans(trans, root, inode);
39279cc3 2164 btrfs_update_inode(trans, root, inode);
d3c2fdcf 2165 nr = trans->blocks_used;
5f39d397 2166
39279cc3
CM		 2167 ret = btrfs_end_transaction(trans, root);
2168 BUG_ON(ret);
2169 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2170 btrfs_btree_balance_dirty(root, nr);
e2008b61 2171 btrfs_throttle(root);
39279cc3
CM		 2172}
2173
4313b399
CM		 2174static int noinline create_subvol(struct btrfs_root *root, char *name,
2175 int namelen)
39279cc3
CM		 2176{
2177 struct btrfs_trans_handle *trans;
2178 struct btrfs_key key;
2179 struct btrfs_root_item root_item;
2180 struct btrfs_inode_item *inode_item;
5f39d397 2181 struct extent_buffer *leaf;
dc17ff8f 2182 struct btrfs_root *new_root = root;
39279cc3
CM		 2183 struct inode *inode;
2184 struct inode *dir;
2185 int ret;
54aa1f4d 2186 int err;
39279cc3
CM		 2187 u64 objectid;
2188 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
d3c2fdcf 2189 unsigned long nr = 1;
39279cc3
CM		 2190
2191 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2192 ret = btrfs_check_free_space(root, 1, 0);
2193 if (ret)
2194 goto fail_commit;
2195
39279cc3
CM		 2196 trans = btrfs_start_transaction(root, 1);
2197 BUG_ON(!trans);
2198
7bb86316
CM		 2199 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2200 0, &objectid);
2201 if (ret)
2202 goto fail;
2203
2204 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2205 objectid, trans->transid, 0, 0,
2206 0, 0);
5f39d397
CM		 2207 if (IS_ERR(leaf))
2208 return PTR_ERR(leaf);
2209
2210 btrfs_set_header_nritems(leaf, 0);
2211 btrfs_set_header_level(leaf, 0);
db94535d 2212 btrfs_set_header_bytenr(leaf, leaf->start);
5f39d397 2213 btrfs_set_header_generation(leaf, trans->transid);
7bb86316
CM		 2214 btrfs_set_header_owner(leaf, objectid);
2215
5f39d397
CM		 2216 write_extent_buffer(leaf, root->fs_info->fsid,
2217 (unsigned long)btrfs_header_fsid(leaf),
2218 BTRFS_FSID_SIZE);
2219 btrfs_mark_buffer_dirty(leaf);
39279cc3
CM		 2220
2221 inode_item = &root_item.inode;
2222 memset(inode_item, 0, sizeof(*inode_item));
5f39d397
CM		 2223 inode_item->generation = cpu_to_le64(1);
2224 inode_item->size = cpu_to_le64(3);
2225 inode_item->nlink = cpu_to_le32(1);
2226 inode_item->nblocks = cpu_to_le64(1);
2227 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
39279cc3 2228
db94535d
CM		 2229 btrfs_set_root_bytenr(&root_item, leaf->start);
2230 btrfs_set_root_level(&root_item, 0);
39279cc3 2231 btrfs_set_root_refs(&root_item, 1);
5f39d397
CM		 2232 btrfs_set_root_used(&root_item, 0);
2233
5eda7b5e
CM		 2234 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2235 root_item.drop_level = 0;
5f39d397
CM		 2236
2237 free_extent_buffer(leaf);
2238 leaf = NULL;
39279cc3 2239
39279cc3
CM		 2240 btrfs_set_root_dirid(&root_item, new_dirid);
2241
2242 key.objectid = objectid;
2243 key.offset = 1;
39279cc3
CM		 2244 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2245 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2246 &root_item);
54aa1f4d
CM		 2247 if (ret)
2248 goto fail;
39279cc3
CM		 2249
2250 /*
2251 * insert the directory item
2252 */
2253 key.offset = (u64)-1;
2254 dir = root->fs_info->sb->s_root->d_inode;
2255 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2256 name, namelen, dir->i_ino, &key,
2257 BTRFS_FT_DIR);
54aa1f4d
CM		 2258 if (ret)
2259 goto fail;
39279cc3 2260
3954401f
CM		 2261 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2262 name, namelen, objectid,
2263 root->fs_info->sb->s_root->d_inode->i_ino);
2264 if (ret)
2265 goto fail;
2266
39279cc3 2267 ret = btrfs_commit_transaction(trans, root);
54aa1f4d
CM		 2268 if (ret)
2269 goto fail_commit;
39279cc3 2270
58176a96 2271 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
39279cc3
CM		 2272 BUG_ON(!new_root);
2273
2274 trans = btrfs_start_transaction(new_root, 1);
2275 BUG_ON(!trans);
2276
2277 inode = btrfs_new_inode(trans, new_root, new_dirid,
2278 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
54aa1f4d
CM		 2279 if (IS_ERR(inode))
2280 goto fail;
39279cc3
CM		 2281 inode->i_op = &btrfs_dir_inode_operations;
2282 inode->i_fop = &btrfs_dir_file_operations;
34088780 2283 new_root->inode = inode;
39279cc3 2284
3954401f
CM		 2285 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2286 new_dirid);
39279cc3 2287 inode->i_nlink = 1;
3954401f 2288 inode->i_size = 0;
39279cc3 2289 ret = btrfs_update_inode(trans, new_root, inode);
54aa1f4d
CM		 2290 if (ret)
2291 goto fail;
2292fail:
d3c2fdcf 2293 nr = trans->blocks_used;
dc17ff8f 2294 err = btrfs_commit_transaction(trans, new_root);
54aa1f4d
CM		 2295 if (err && !ret)
2296 ret = err;
2297fail_commit:
39279cc3 2298 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2299 btrfs_btree_balance_dirty(root, nr);
e2008b61 2300 btrfs_throttle(root);
54aa1f4d 2301 return ret;
39279cc3
CM		 2302}
2303
2304static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2305{
3063d29f 2306 struct btrfs_pending_snapshot *pending_snapshot;
39279cc3 2307 struct btrfs_trans_handle *trans;
39279cc3 2308 int ret;
54aa1f4d 2309 int err;
1832a6d5 2310 unsigned long nr = 0;
39279cc3
CM		 2311
2312 if (!root->ref_cows)
2313 return -EINVAL;
2314
2315 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2316 ret = btrfs_check_free_space(root, 1, 0);
2317 if (ret)
2318 goto fail_unlock;
2319
3063d29f
CM		 2320 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
2321 if (!pending_snapshot) {
2322 ret = -ENOMEM;
2323 goto fail_unlock;
2324 }
2325 pending_snapshot->name = kstrndup(name, namelen, GFP_NOFS);
2326 if (!pending_snapshot->name) {
2327 ret = -ENOMEM;
2328 kfree(pending_snapshot);
2329 goto fail_unlock;
2330 }
39279cc3
CM		 2331 trans = btrfs_start_transaction(root, 1);
2332 BUG_ON(!trans);
2333
3063d29f
CM		 2334 pending_snapshot->root = root;
2335 list_add(&pending_snapshot->list,
2336 &trans->transaction->pending_snapshots);
39279cc3 2337 ret = btrfs_update_inode(trans, root, root->inode);
54aa1f4d 2338 err = btrfs_commit_transaction(trans, root);
5f39d397 2339
1832a6d5 2340fail_unlock:
39279cc3 2341 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2342 btrfs_btree_balance_dirty(root, nr);
e2008b61 2343 btrfs_throttle(root);
54aa1f4d 2344 return ret;
39279cc3
CM		 2345}
2346
edbd8d4e 2347unsigned long btrfs_force_ra(struct address_space *mapping,
86479a04
CM		 2348 struct file_ra_state *ra, struct file *file,
2349 pgoff_t offset, pgoff_t last_index)
2350{
2351 pgoff_t req_size;
2352
2353#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2354 req_size = last_index - offset + 1;
2355 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2356 return offset;
2357#else
2358 req_size = min(last_index - offset + 1, (pgoff_t)128);
2359 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2360 return offset + req_size;
2361#endif
2362}
2363
2364int btrfs_defrag_file(struct file *file) {
6da6abae 2365 struct inode *inode = fdentry(file)->d_inode;
1832a6d5 2366 struct btrfs_root *root = BTRFS_I(inode)->root;
86479a04
CM		 2367 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
2368 struct page *page;
2369 unsigned long last_index;
2370 unsigned long ra_index = 0;
2371 u64 page_start;
2372 u64 page_end;
edbd8d4e
CM		 2373 u64 delalloc_start;
2374 u64 existing_delalloc;
86479a04 2375 unsigned long i;
1832a6d5
CM		 2376 int ret;
2377
2378 mutex_lock(&root->fs_info->fs_mutex);
2379 ret = btrfs_check_free_space(root, inode->i_size, 0);
2380 mutex_unlock(&root->fs_info->fs_mutex);
2381 if (ret)
2382 return -ENOSPC;
86479a04
CM		 2383
2384 mutex_lock(&inode->i_mutex);
2385 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2386 for (i = 0; i <= last_index; i++) {
2387 if (i == ra_index) {
edbd8d4e
CM		 2388 ra_index = btrfs_force_ra(inode->i_mapping,
2389 &file->f_ra,
2390 file, ra_index, last_index);
86479a04
CM		 2391 }
2392 page = grab_cache_page(inode->i_mapping, i);
2393 if (!page)
2394 goto out_unlock;
2395 if (!PageUptodate(page)) {
2396 btrfs_readpage(NULL, page);
2397 lock_page(page);
2398 if (!PageUptodate(page)) {
2399 unlock_page(page);
2400 page_cache_release(page);
2401 goto out_unlock;
2402 }
2403 }
35ebb934 2404 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
86479a04
CM		 2405 page_end = page_start + PAGE_CACHE_SIZE - 1;
2406
2407 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
edbd8d4e
CM		 2408 delalloc_start = page_start;
2409 existing_delalloc =
2410 count_range_bits(&BTRFS_I(inode)->extent_tree,
2411 &delalloc_start, page_end,
2412 PAGE_CACHE_SIZE, EXTENT_DELALLOC);
86479a04
CM		 2413 set_extent_delalloc(em_tree, page_start,
2414 page_end, GFP_NOFS);
edbd8d4e
CM		 2415
2416 spin_lock(&root->fs_info->delalloc_lock);
2417 root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE -
2418 existing_delalloc;
2419 spin_unlock(&root->fs_info->delalloc_lock);
2420
86479a04
CM		 2421 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
2422 set_page_dirty(page);
2423 unlock_page(page);
2424 page_cache_release(page);
2425 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2426 }
2427
2428out_unlock:
2429 mutex_unlock(&inode->i_mutex);
2430 return 0;
2431}
2432
edbd8d4e
CM		 2433static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2434{
2435 u64 new_size;
2436 u64 old_size;
2437 struct btrfs_ioctl_vol_args *vol_args;
2438 struct btrfs_trans_handle *trans;
2439 char *sizestr;
2440 int ret = 0;
2441 int namelen;
2442 int mod = 0;
2443
2444 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2445
2446 if (!vol_args)
2447 return -ENOMEM;
2448
2449 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2450 ret = -EFAULT;
2451 goto out;
2452 }
2453 namelen = strlen(vol_args->name);
2454 if (namelen > BTRFS_VOL_NAME_MAX) {
2455 ret = -EINVAL;
2456 goto out;
2457 }
2458
2459 sizestr = vol_args->name;
2460 if (!strcmp(sizestr, "max"))
2461 new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
2462 else {
2463 if (sizestr[0] == '-') {
2464 mod = -1;
2465 sizestr++;
2466 } else if (sizestr[0] == '+') {
2467 mod = 1;
2468 sizestr++;
2469 }
2470 new_size = btrfs_parse_size(sizestr);
2471 if (new_size == 0) {
2472 ret = -EINVAL;
2473 goto out;
2474 }
2475 }
2476
2477 mutex_lock(&root->fs_info->fs_mutex);
2478 old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);
2479
2480 if (mod < 0) {
2481 if (new_size > old_size) {
2482 ret = -EINVAL;
2483 goto out_unlock;
2484 }
2485 new_size = old_size - new_size;
2486 } else if (mod > 0) {
2487 new_size = old_size + new_size;
2488 }
2489
2490 if (new_size < 256 * 1024 * 1024) {
2491 ret = -EINVAL;
2492 goto out_unlock;
2493 }
2494 if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
2495 ret = -EFBIG;
2496 goto out_unlock;
2497 }
f9ef6604
CM		 2498
2499 do_div(new_size, root->sectorsize);
2500 new_size *= root->sectorsize;
edbd8d4e
CM		 2501
2502printk("new size is %Lu\n", new_size);
2503 if (new_size > old_size) {
2504 trans = btrfs_start_transaction(root, 1);
2505 ret = btrfs_grow_extent_tree(trans, root, new_size);
2506 btrfs_commit_transaction(trans, root);
2507 } else {
2508 ret = btrfs_shrink_extent_tree(root, new_size);
2509 }
2510
2511out_unlock:
2512 mutex_unlock(&root->fs_info->fs_mutex);
2513out:
2514 kfree(vol_args);
2515 return ret;
2516}
2517
4313b399
CM		 2518static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
2519 void __user *arg)
39279cc3 2520{
4aec2b52 2521 struct btrfs_ioctl_vol_args *vol_args;
39279cc3 2522 struct btrfs_dir_item *di;
39279cc3
CM		 2523 struct btrfs_path *path;
2524 u64 root_dirid;
4aec2b52
CM		 2525 int namelen;
2526 int ret;
39279cc3 2527
4aec2b52 2528 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
5f39d397 2529
4aec2b52
CM		 2530 if (!vol_args)
2531 return -ENOMEM;
2532
2533 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2534 ret = -EFAULT;
2535 goto out;
2536 }
2537
2538 namelen = strlen(vol_args->name);
2539 if (namelen > BTRFS_VOL_NAME_MAX) {
2540 ret = -EINVAL;
2541 goto out;
2542 }
2543 if (strchr(vol_args->name, '/')) {
2544 ret = -EINVAL;
2545 goto out;
2546 }
d03581f4
CH		 2547
2548 path = btrfs_alloc_path();
4aec2b52
CM		 2549 if (!path) {
2550 ret = -ENOMEM;
2551 goto out;
2552 }
d03581f4
CH		 2553
2554 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2555 mutex_lock(&root->fs_info->fs_mutex);
2556 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2557 path, root_dirid,
4aec2b52 2558 vol_args->name, namelen, 0);
d03581f4
CH		 2559 mutex_unlock(&root->fs_info->fs_mutex);
2560 btrfs_free_path(path);
4aec2b52
CM		 2561
2562 if (di && !IS_ERR(di)) {
2563 ret = -EEXIST;
2564 goto out;
2565 }
2566
2567 if (IS_ERR(di)) {
2568 ret = PTR_ERR(di);
2569 goto out;
2570 }
d03581f4
CH		 2571
2572 if (root == root->fs_info->tree_root)
4aec2b52
CM		 2573 ret = create_subvol(root, vol_args->name, namelen);
2574 else
2575 ret = create_snapshot(root, vol_args->name, namelen);
2576out:
2577 kfree(vol_args);
2578 return ret;
d03581f4
CH		 2579}
2580
2581static int btrfs_ioctl_defrag(struct file *file)
2582{
6da6abae 2583 struct inode *inode = fdentry(file)->d_inode;
d03581f4
CH		 2584 struct btrfs_root *root = BTRFS_I(inode)->root;
2585
2586 switch (inode->i_mode & S_IFMT) {
2587 case S_IFDIR:
39279cc3 2588 mutex_lock(&root->fs_info->fs_mutex);
d03581f4
CH		 2589 btrfs_defrag_root(root, 0);
2590 btrfs_defrag_root(root->fs_info->extent_root, 0);
39279cc3 2591 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3 2592 break;
d03581f4
CH		 2593 case S_IFREG:
2594 btrfs_defrag_file(file);
2595 break;
2596 }
2597
2598 return 0;
2599}
6702ed49 2600
d03581f4
CH		 2601long btrfs_ioctl(struct file *file, unsigned int
2602 cmd, unsigned long arg)
2603{
6da6abae 2604 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
d03581f4
CH		 2605
2606 switch (cmd) {
2607 case BTRFS_IOC_SNAP_CREATE:
2608 return btrfs_ioctl_snap_create(root, (void __user *)arg);
6702ed49 2609 case BTRFS_IOC_DEFRAG:
d03581f4 2610 return btrfs_ioctl_defrag(file);
edbd8d4e
CM		 2611 case BTRFS_IOC_RESIZE:
2612 return btrfs_ioctl_resize(root, (void __user *)arg);
39279cc3 2613 }
d03581f4
CH		 2614
2615 return -ENOTTY;
39279cc3
CM		 2616}
2617
39279cc3
CM		 2618/*
2619 * Called inside transaction, so use GFP_NOFS
2620 */
2621struct inode *btrfs_alloc_inode(struct super_block *sb)
2622{
2623 struct btrfs_inode *ei;
2624
2625 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2626 if (!ei)
2627 return NULL;
15ee9bc7 2628 ei->last_trans = 0;
dc17ff8f 2629 ei->ordered_trans = 0;
39279cc3
CM		 2630 return &ei->vfs_inode;
2631}
2632
2633void btrfs_destroy_inode(struct inode *inode)
2634{
2635 WARN_ON(!list_empty(&inode->i_dentry));
2636 WARN_ON(inode->i_data.nrpages);
2637
8c416c9e 2638 btrfs_drop_extent_cache(inode, 0, (u64)-1);
39279cc3
CM		 2639 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2640}
2641
44ec0b71
CM		 2642#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2643static void init_once(struct kmem_cache * cachep, void *foo)
2644#else
39279cc3
CM		 2645static void init_once(void * foo, struct kmem_cache * cachep,
2646 unsigned long flags)
44ec0b71 2647#endif
39279cc3
CM		 2648{
2649 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2650
2651 inode_init_once(&ei->vfs_inode);
2652}
2653
2654void btrfs_destroy_cachep(void)
2655{
2656 if (btrfs_inode_cachep)
2657 kmem_cache_destroy(btrfs_inode_cachep);
2658 if (btrfs_trans_handle_cachep)
2659 kmem_cache_destroy(btrfs_trans_handle_cachep);
2660 if (btrfs_transaction_cachep)
2661 kmem_cache_destroy(btrfs_transaction_cachep);
2662 if (btrfs_bit_radix_cachep)
2663 kmem_cache_destroy(btrfs_bit_radix_cachep);
2664 if (btrfs_path_cachep)
2665 kmem_cache_destroy(btrfs_path_cachep);
2666}
2667
86479a04 2668struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
92fee66d 2669 unsigned long extra_flags,
44ec0b71
CM		 2670#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2671 void (*ctor)(struct kmem_cache *, void *)
2672#else
92fee66d 2673 void (*ctor)(void *, struct kmem_cache *,
44ec0b71
CM		 2674 unsigned long)
2675#endif
2676 )
92fee66d
CM		 2677{
2678 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2679 SLAB_MEM_SPREAD | extra_flags), ctor
2680#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2681 ,NULL
2682#endif
2683 );
2684}
2685
39279cc3
CM		 2686int btrfs_init_cachep(void)
2687{
86479a04 2688 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
92fee66d
CM		 2689 sizeof(struct btrfs_inode),
2690 0, init_once);
39279cc3
CM		 2691 if (!btrfs_inode_cachep)
2692 goto fail;
86479a04
CM		 2693 btrfs_trans_handle_cachep =
2694 btrfs_cache_create("btrfs_trans_handle_cache",
2695 sizeof(struct btrfs_trans_handle),
2696 0, NULL);
39279cc3
CM		 2697 if (!btrfs_trans_handle_cachep)
2698 goto fail;
86479a04 2699 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
39279cc3 2700 sizeof(struct btrfs_transaction),
92fee66d 2701 0, NULL);
39279cc3
CM		 2702 if (!btrfs_transaction_cachep)
2703 goto fail;
86479a04 2704 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
23223584 2705 sizeof(struct btrfs_path),
92fee66d 2706 0, NULL);
39279cc3
CM		 2707 if (!btrfs_path_cachep)
2708 goto fail;
86479a04 2709 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
92fee66d 2710 SLAB_DESTROY_BY_RCU, NULL);
39279cc3
CM		 2711 if (!btrfs_bit_radix_cachep)
2712 goto fail;
2713 return 0;
2714fail:
2715 btrfs_destroy_cachep();
2716 return -ENOMEM;
2717}
2718
2719static int btrfs_getattr(struct vfsmount *mnt,
2720 struct dentry *dentry, struct kstat *stat)
2721{
2722 struct inode *inode = dentry->d_inode;
2723 generic_fillattr(inode, stat);
d6667462 2724 stat->blksize = PAGE_CACHE_SIZE;
39279cc3
CM		 2725 return 0;
2726}
2727
2728static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
2729 struct inode * new_dir,struct dentry *new_dentry)
2730{
2731 struct btrfs_trans_handle *trans;
2732 struct btrfs_root *root = BTRFS_I(old_dir)->root;
2733 struct inode *new_inode = new_dentry->d_inode;
2734 struct inode *old_inode = old_dentry->d_inode;
2735 struct timespec ctime = CURRENT_TIME;
2736 struct btrfs_path *path;
39279cc3
CM		 2737 int ret;
2738
2739 if (S_ISDIR(old_inode->i_mode) && new_inode &&
2740 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
2741 return -ENOTEMPTY;
2742 }
5f39d397 2743
39279cc3 2744 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2745 ret = btrfs_check_free_space(root, 1, 0);
2746 if (ret)
2747 goto out_unlock;
2748
39279cc3 2749 trans = btrfs_start_transaction(root, 1);
5f39d397 2750
39279cc3
CM		 2751 btrfs_set_trans_block_group(trans, new_dir);
2752 path = btrfs_alloc_path();
2753 if (!path) {
2754 ret = -ENOMEM;
2755 goto out_fail;
2756 }
2757
2758 old_dentry->d_inode->i_nlink++;
2759 old_dir->i_ctime = old_dir->i_mtime = ctime;
2760 new_dir->i_ctime = new_dir->i_mtime = ctime;
2761 old_inode->i_ctime = ctime;
5f39d397 2762
39279cc3
CM		 2763 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
2764 if (ret)
2765 goto out_fail;
2766
2767 if (new_inode) {
2768 new_inode->i_ctime = CURRENT_TIME;
2769 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
2770 if (ret)
2771 goto out_fail;
39279cc3
CM		 2772 }
2773 ret = btrfs_add_link(trans, new_dentry, old_inode);
2774 if (ret)
2775 goto out_fail;
2776
2777out_fail:
2778 btrfs_free_path(path);
2779 btrfs_end_transaction(trans, root);
1832a6d5 2780out_unlock:
39279cc3
CM		 2781 mutex_unlock(&root->fs_info->fs_mutex);
2782 return ret;
2783}
2784
2785static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
2786 const char *symname)
2787{
2788 struct btrfs_trans_handle *trans;
2789 struct btrfs_root *root = BTRFS_I(dir)->root;
2790 struct btrfs_path *path;
2791 struct btrfs_key key;
1832a6d5 2792 struct inode *inode = NULL;
39279cc3
CM		 2793 int err;
2794 int drop_inode = 0;
2795 u64 objectid;
2796 int name_len;
2797 int datasize;
5f39d397 2798 unsigned long ptr;
39279cc3 2799 struct btrfs_file_extent_item *ei;
5f39d397 2800 struct extent_buffer *leaf;
1832a6d5 2801 unsigned long nr = 0;
39279cc3
CM		 2802
2803 name_len = strlen(symname) + 1;
2804 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
2805 return -ENAMETOOLONG;
1832a6d5 2806
39279cc3 2807 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2808 err = btrfs_check_free_space(root, 1, 0);
2809 if (err)
2810 goto out_fail;
2811
39279cc3
CM		 2812 trans = btrfs_start_transaction(root, 1);
2813 btrfs_set_trans_block_group(trans, dir);
2814
2815 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2816 if (err) {
2817 err = -ENOSPC;
2818 goto out_unlock;
2819 }
2820
2821 inode = btrfs_new_inode(trans, root, objectid,
2822 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
2823 err = PTR_ERR(inode);
2824 if (IS_ERR(inode))
2825 goto out_unlock;
2826
2827 btrfs_set_trans_block_group(trans, inode);
2828 err = btrfs_add_nondir(trans, dentry, inode);
2829 if (err)
2830 drop_inode = 1;
2831 else {
2832 inode->i_mapping->a_ops = &btrfs_aops;
2833 inode->i_fop = &btrfs_file_operations;
2834 inode->i_op = &btrfs_file_inode_operations;
a52d9a80
CM		 2835 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
2836 inode->i_mapping, GFP_NOFS);
07157aac 2837 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
39279cc3
CM		 2838 }
2839 dir->i_sb->s_dirt = 1;
2840 btrfs_update_inode_block_group(trans, inode);
2841 btrfs_update_inode_block_group(trans, dir);
2842 if (drop_inode)
2843 goto out_unlock;
2844
2845 path = btrfs_alloc_path();
2846 BUG_ON(!path);
2847 key.objectid = inode->i_ino;
2848 key.offset = 0;
39279cc3
CM		 2849 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2850 datasize = btrfs_file_extent_calc_inline_size(name_len);
2851 err = btrfs_insert_empty_item(trans, root, path, &key,
2852 datasize);
54aa1f4d
CM		 2853 if (err) {
2854 drop_inode = 1;
2855 goto out_unlock;
2856 }
5f39d397
CM		 2857 leaf = path->nodes[0];
2858 ei = btrfs_item_ptr(leaf, path->slots[0],
2859 struct btrfs_file_extent_item);
2860 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
2861 btrfs_set_file_extent_type(leaf, ei,
39279cc3
CM		 2862 BTRFS_FILE_EXTENT_INLINE);
2863 ptr = btrfs_file_extent_inline_start(ei);
5f39d397
CM		 2864 write_extent_buffer(leaf, symname, ptr, name_len);
2865 btrfs_mark_buffer_dirty(leaf);
39279cc3 2866 btrfs_free_path(path);
5f39d397 2867
39279cc3
CM		 2868 inode->i_op = &btrfs_symlink_inode_operations;
2869 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2870 inode->i_size = name_len - 1;
54aa1f4d
CM		 2871 err = btrfs_update_inode(trans, root, inode);
2872 if (err)
2873 drop_inode = 1;
39279cc3
CM		 2874
2875out_unlock:
d3c2fdcf 2876 nr = trans->blocks_used;
39279cc3 2877 btrfs_end_transaction(trans, root);
1832a6d5 2878out_fail:
39279cc3 2879 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 2880 if (drop_inode) {
2881 inode_dec_link_count(inode);
2882 iput(inode);
2883 }
d3c2fdcf 2884 btrfs_btree_balance_dirty(root, nr);
e2008b61 2885 btrfs_throttle(root);
39279cc3
CM		 2886 return err;
2887}
fdebe2bd
Y		 2888static int btrfs_permission(struct inode *inode, int mask,
2889 struct nameidata *nd)
2890{
2891 if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
2892 return -EACCES;
2893 return generic_permission(inode, mask, NULL);
2894}
39279cc3
CM		 2895
2896static struct inode_operations btrfs_dir_inode_operations = {
2897 .lookup = btrfs_lookup,
2898 .create = btrfs_create,
2899 .unlink = btrfs_unlink,
2900 .link = btrfs_link,
2901 .mkdir = btrfs_mkdir,
2902 .rmdir = btrfs_rmdir,
2903 .rename = btrfs_rename,
2904 .symlink = btrfs_symlink,
2905 .setattr = btrfs_setattr,
618e21d5 2906 .mknod = btrfs_mknod,
5103e947
JB		 2907 .setxattr = generic_setxattr,
2908 .getxattr = generic_getxattr,
2909 .listxattr = btrfs_listxattr,
2910 .removexattr = generic_removexattr,
fdebe2bd 2911 .permission = btrfs_permission,
39279cc3 2912};
39279cc3
CM		 2913static struct inode_operations btrfs_dir_ro_inode_operations = {
2914 .lookup = btrfs_lookup,
fdebe2bd 2915 .permission = btrfs_permission,
39279cc3 2916};
39279cc3
CM		 2917static struct file_operations btrfs_dir_file_operations = {
2918 .llseek = generic_file_llseek,
2919 .read = generic_read_dir,
2920 .readdir = btrfs_readdir,
34287aa3 2921 .unlocked_ioctl = btrfs_ioctl,
39279cc3 2922#ifdef CONFIG_COMPAT
34287aa3 2923 .compat_ioctl = btrfs_ioctl,
39279cc3
CM		 2924#endif
2925};
2926
07157aac
CM		 2927static struct extent_map_ops btrfs_extent_map_ops = {
2928 .fill_delalloc = run_delalloc_range,
2929 .writepage_io_hook = btrfs_writepage_io_hook,
2930 .readpage_io_hook = btrfs_readpage_io_hook,
2931 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
2932};
2933
39279cc3
CM		 2934static struct address_space_operations btrfs_aops = {
2935 .readpage = btrfs_readpage,
2936 .writepage = btrfs_writepage,
b293f02e 2937 .writepages = btrfs_writepages,
3ab2fb5a 2938 .readpages = btrfs_readpages,
39279cc3 2939 .sync_page = block_sync_page,
39279cc3 2940 .bmap = btrfs_bmap,
a52d9a80
CM		 2941 .invalidatepage = btrfs_invalidatepage,
2942 .releasepage = btrfs_releasepage,
2943 .set_page_dirty = __set_page_dirty_nobuffers,
39279cc3
CM		 2944};
2945
2946static struct address_space_operations btrfs_symlink_aops = {
2947 .readpage = btrfs_readpage,
2948 .writepage = btrfs_writepage,
2bf5a725
CM		 2949 .invalidatepage = btrfs_invalidatepage,
2950 .releasepage = btrfs_releasepage,
39279cc3
CM		 2951};
2952
2953static struct inode_operations btrfs_file_inode_operations = {
2954 .truncate = btrfs_truncate,
2955 .getattr = btrfs_getattr,
2956 .setattr = btrfs_setattr,
5103e947
JB		 2957 .setxattr = generic_setxattr,
2958 .getxattr = generic_getxattr,
2959 .listxattr = btrfs_listxattr,
2960 .removexattr = generic_removexattr,
fdebe2bd 2961 .permission = btrfs_permission,
39279cc3 2962};
618e21d5
JB		 2963static struct inode_operations btrfs_special_inode_operations = {
2964 .getattr = btrfs_getattr,
2965 .setattr = btrfs_setattr,
fdebe2bd 2966 .permission = btrfs_permission,
618e21d5 2967};
39279cc3
CM		 2968static struct inode_operations btrfs_symlink_inode_operations = {
2969 .readlink = generic_readlink,
2970 .follow_link = page_follow_link_light,
2971 .put_link = page_put_link,
fdebe2bd 2972 .permission = btrfs_permission,
39279cc3 2973};
Linux 6.x block layer and io_uring tree(s)