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Btrfs: Disable delalloc accounting for now
[linux-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;
604 int ret;
1832a6d5 605 unsigned long nr = 0;
39279cc3
CM		 606
607 root = BTRFS_I(dir)->root;
608 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 609
610 ret = btrfs_check_free_space(root, 1, 1);
611 if (ret)
612 goto fail;
613
39279cc3 614 trans = btrfs_start_transaction(root, 1);
5f39d397 615
39279cc3
CM		 616 btrfs_set_trans_block_group(trans, dir);
617 ret = btrfs_unlink_trans(trans, root, dir, dentry);
d3c2fdcf 618 nr = trans->blocks_used;
5f39d397 619
39279cc3 620 btrfs_end_transaction(trans, root);
1832a6d5 621fail:
39279cc3 622 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 623 btrfs_btree_balance_dirty(root, nr);
e2008b61 624 btrfs_throttle(root);
39279cc3
CM		 625 return ret;
626}
627
628static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
629{
630 struct inode *inode = dentry->d_inode;
1832a6d5 631 int err = 0;
39279cc3
CM		 632 int ret;
633 struct btrfs_root *root = BTRFS_I(dir)->root;
39279cc3 634 struct btrfs_trans_handle *trans;
1832a6d5 635 unsigned long nr = 0;
39279cc3 636
134d4512
Y		 637 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
638 return -ENOTEMPTY;
639
39279cc3 640 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 641 ret = btrfs_check_free_space(root, 1, 1);
642 if (ret)
643 goto fail;
644
39279cc3
CM		 645 trans = btrfs_start_transaction(root, 1);
646 btrfs_set_trans_block_group(trans, dir);
39279cc3
CM		 647
648 /* now the directory is empty */
649 err = btrfs_unlink_trans(trans, root, dir, dentry);
650 if (!err) {
651 inode->i_size = 0;
652 }
3954401f 653
d3c2fdcf 654 nr = trans->blocks_used;
39279cc3 655 ret = btrfs_end_transaction(trans, root);
1832a6d5 656fail:
134d4512 657 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 658 btrfs_btree_balance_dirty(root, nr);
e2008b61 659 btrfs_throttle(root);
3954401f 660
39279cc3
CM		 661 if (ret && !err)
662 err = ret;
663 return err;
664}
665
666static int btrfs_free_inode(struct btrfs_trans_handle *trans,
667 struct btrfs_root *root,
668 struct inode *inode)
669{
670 struct btrfs_path *path;
671 int ret;
672
673 clear_inode(inode);
674
675 path = btrfs_alloc_path();
676 BUG_ON(!path);
39279cc3
CM		 677 ret = btrfs_lookup_inode(trans, root, path,
678 &BTRFS_I(inode)->location, -1);
54aa1f4d
CM		 679 if (ret > 0)
680 ret = -ENOENT;
681 if (!ret)
682 ret = btrfs_del_item(trans, root, path);
39279cc3
CM		 683 btrfs_free_path(path);
684 return ret;
685}
686
39279cc3
CM		 687/*
688 * this can truncate away extent items, csum items and directory items.
689 * It starts at a high offset and removes keys until it can't find
690 * any higher than i_size.
691 *
692 * csum items that cross the new i_size are truncated to the new size
693 * as well.
694 */
695static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
696 struct btrfs_root *root,
697 struct inode *inode)
698{
699 int ret;
700 struct btrfs_path *path;
701 struct btrfs_key key;
5f39d397 702 struct btrfs_key found_key;
39279cc3 703 u32 found_type;
5f39d397 704 struct extent_buffer *leaf;
39279cc3
CM		 705 struct btrfs_file_extent_item *fi;
706 u64 extent_start = 0;
db94535d 707 u64 extent_num_bytes = 0;
39279cc3 708 u64 item_end = 0;
7bb86316 709 u64 root_gen = 0;
d8d5f3e1 710 u64 root_owner = 0;
39279cc3
CM		 711 int found_extent;
712 int del_item;
179e29e4 713 int extent_type = -1;
39279cc3 714
a52d9a80 715 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
39279cc3 716 path = btrfs_alloc_path();
3c69faec 717 path->reada = -1;
39279cc3 718 BUG_ON(!path);
5f39d397 719
39279cc3
CM		 720 /* FIXME, add redo link to tree so we don't leak on crash */
721 key.objectid = inode->i_ino;
722 key.offset = (u64)-1;
5f39d397
CM		 723 key.type = (u8)-1;
724
39279cc3
CM		 725 while(1) {
726 btrfs_init_path(path);
727 fi = NULL;
728 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
729 if (ret < 0) {
730 goto error;
731 }
732 if (ret > 0) {
733 BUG_ON(path->slots[0] == 0);
734 path->slots[0]--;
735 }
5f39d397
CM		 736 leaf = path->nodes[0];
737 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
738 found_type = btrfs_key_type(&found_key);
39279cc3 739
5f39d397 740 if (found_key.objectid != inode->i_ino)
39279cc3 741 break;
5f39d397 742
39279cc3
CM		 743 if (found_type != BTRFS_CSUM_ITEM_KEY &&
744 found_type != BTRFS_DIR_ITEM_KEY &&
745 found_type != BTRFS_DIR_INDEX_KEY &&
746 found_type != BTRFS_EXTENT_DATA_KEY)
747 break;
748
5f39d397 749 item_end = found_key.offset;
39279cc3 750 if (found_type == BTRFS_EXTENT_DATA_KEY) {
5f39d397 751 fi = btrfs_item_ptr(leaf, path->slots[0],
39279cc3 752 struct btrfs_file_extent_item);
179e29e4
CM		 753 extent_type = btrfs_file_extent_type(leaf, fi);
754 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
5f39d397 755 item_end +=
db94535d 756 btrfs_file_extent_num_bytes(leaf, fi);
179e29e4
CM		 757 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
758 struct btrfs_item *item = btrfs_item_nr(leaf,
759 path->slots[0]);
760 item_end += btrfs_file_extent_inline_len(leaf,
761 item);
39279cc3 762 }
008630c1 763 item_end--;
39279cc3
CM		 764 }
765 if (found_type == BTRFS_CSUM_ITEM_KEY) {
766 ret = btrfs_csum_truncate(trans, root, path,
767 inode->i_size);
768 BUG_ON(ret);
769 }
008630c1 770 if (item_end < inode->i_size) {
b888db2b
CM		 771 if (found_type == BTRFS_DIR_ITEM_KEY) {
772 found_type = BTRFS_INODE_ITEM_KEY;
773 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
774 found_type = BTRFS_CSUM_ITEM_KEY;
775 } else if (found_type) {
776 found_type--;
777 } else {
778 break;
39279cc3 779 }
a61721d5 780 btrfs_set_key_type(&key, found_type);
65555a06 781 btrfs_release_path(root, path);
b888db2b 782 continue;
39279cc3 783 }
5f39d397 784 if (found_key.offset >= inode->i_size)
39279cc3
CM		 785 del_item = 1;
786 else
787 del_item = 0;
788 found_extent = 0;
789
790 /* FIXME, shrink the extent if the ref count is only 1 */
179e29e4
CM		 791 if (found_type != BTRFS_EXTENT_DATA_KEY)
792 goto delete;
793
794 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
39279cc3 795 u64 num_dec;
db94535d 796 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
39279cc3 797 if (!del_item) {
db94535d
CM		 798 u64 orig_num_bytes =
799 btrfs_file_extent_num_bytes(leaf, fi);
800 extent_num_bytes = inode->i_size -
5f39d397 801 found_key.offset + root->sectorsize - 1;
db94535d
CM		 802 btrfs_set_file_extent_num_bytes(leaf, fi,
803 extent_num_bytes);
804 num_dec = (orig_num_bytes -
805 extent_num_bytes) >> 9;
bab9fb03
Y		 806 if (extent_start != 0) {
807 inode->i_blocks -= num_dec;
808 }
5f39d397 809 btrfs_mark_buffer_dirty(leaf);
39279cc3 810 } else {
db94535d
CM		 811 extent_num_bytes =
812 btrfs_file_extent_disk_num_bytes(leaf,
813 fi);
39279cc3 814 /* FIXME blocksize != 4096 */
db94535d
CM		 815 num_dec = btrfs_file_extent_num_bytes(leaf,
816 fi) >> 9;
39279cc3
CM		 817 if (extent_start != 0) {
818 found_extent = 1;
819 inode->i_blocks -= num_dec;
820 }
d8d5f3e1
CM		 821 root_gen = btrfs_header_generation(leaf);
822 root_owner = btrfs_header_owner(leaf);
39279cc3 823 }
179e29e4
CM		 824 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE &&
825 !del_item) {
826 u32 newsize = inode->i_size - found_key.offset;
827 newsize = btrfs_file_extent_calc_inline_size(newsize);
828 ret = btrfs_truncate_item(trans, root, path,
829 newsize, 1);
830 BUG_ON(ret);
39279cc3 831 }
179e29e4 832delete:
39279cc3
CM		 833 if (del_item) {
834 ret = btrfs_del_item(trans, root, path);
54aa1f4d
CM		 835 if (ret)
836 goto error;
39279cc3
CM		 837 } else {
838 break;
839 }
840 btrfs_release_path(root, path);
841 if (found_extent) {
842 ret = btrfs_free_extent(trans, root, extent_start,
7bb86316 843 extent_num_bytes,
d8d5f3e1 844 root_owner,
7bb86316
CM		 845 root_gen, inode->i_ino,
846 found_key.offset, 0);
39279cc3
CM		 847 BUG_ON(ret);
848 }
849 }
850 ret = 0;
851error:
852 btrfs_release_path(root, path);
853 btrfs_free_path(path);
854 inode->i_sb->s_dirt = 1;
855 return ret;
856}
857
b888db2b 858static int btrfs_cow_one_page(struct inode *inode, struct page *page,
a52d9a80
CM		 859 size_t zero_start)
860{
861 char *kaddr;
b888db2b 862 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1832a6d5 863 struct btrfs_root *root = BTRFS_I(inode)->root;
35ebb934 864 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
b888db2b 865 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
1832a6d5
CM		 866 u64 existing_delalloc;
867 u64 delalloc_start;
868 int ret = 0;
a52d9a80 869
190662b2 870 WARN_ON(!PageLocked(page));
b3cfa35a 871 set_page_extent_mapped(page);
a52d9a80 872
b888db2b 873 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
1832a6d5
CM		 874 delalloc_start = page_start;
875 existing_delalloc = count_range_bits(&BTRFS_I(inode)->extent_tree,
876 &delalloc_start, page_end,
877 PAGE_CACHE_SIZE, EXTENT_DELALLOC);
b888db2b
CM		 878 set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start,
879 page_end, GFP_NOFS);
1832a6d5
CM		 880
881 spin_lock(&root->fs_info->delalloc_lock);
882 root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE - existing_delalloc;
883 spin_unlock(&root->fs_info->delalloc_lock);
884
a52d9a80 885 if (zero_start != PAGE_CACHE_SIZE) {
b888db2b 886 kaddr = kmap(page);
a52d9a80
CM		 887 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
888 flush_dcache_page(page);
b888db2b 889 kunmap(page);
a52d9a80 890 }
b888db2b
CM		 891 set_page_dirty(page);
892 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
a52d9a80 893
a52d9a80
CM		 894 return ret;
895}
896
39279cc3
CM		 897/*
898 * taken from block_truncate_page, but does cow as it zeros out
899 * any bytes left in the last page in the file.
900 */
901static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
902{
903 struct inode *inode = mapping->host;
db94535d
CM		 904 struct btrfs_root *root = BTRFS_I(inode)->root;
905 u32 blocksize = root->sectorsize;
39279cc3
CM		 906 pgoff_t index = from >> PAGE_CACHE_SHIFT;
907 unsigned offset = from & (PAGE_CACHE_SIZE-1);
908 struct page *page;
39279cc3 909 int ret = 0;
a52d9a80 910 u64 page_start;
39279cc3
CM		 911
912 if ((offset & (blocksize - 1)) == 0)
913 goto out;
914
915 ret = -ENOMEM;
916 page = grab_cache_page(mapping, index);
917 if (!page)
918 goto out;
39279cc3 919 if (!PageUptodate(page)) {
9ebefb18 920 ret = btrfs_readpage(NULL, page);
39279cc3
CM		 921 lock_page(page);
922 if (!PageUptodate(page)) {
923 ret = -EIO;
924 goto out;
925 }
926 }
35ebb934 927 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 928
b888db2b 929 ret = btrfs_cow_one_page(inode, page, offset);
39279cc3 930
39279cc3
CM		 931 unlock_page(page);
932 page_cache_release(page);
933out:
934 return ret;
935}
936
937static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
938{
939 struct inode *inode = dentry->d_inode;
940 int err;
941
942 err = inode_change_ok(inode, attr);
943 if (err)
944 return err;
945
946 if (S_ISREG(inode->i_mode) &&
947 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
948 struct btrfs_trans_handle *trans;
949 struct btrfs_root *root = BTRFS_I(inode)->root;
2bf5a725
CM		 950 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
951
5f39d397 952 u64 mask = root->sectorsize - 1;
39279cc3 953 u64 pos = (inode->i_size + mask) & ~mask;
2bf5a725 954 u64 block_end = attr->ia_size | mask;
39279cc3 955 u64 hole_size;
179e29e4 956 u64 alloc_hint = 0;
39279cc3
CM		 957
958 if (attr->ia_size <= pos)
959 goto out;
960
1832a6d5
CM		 961 mutex_lock(&root->fs_info->fs_mutex);
962 err = btrfs_check_free_space(root, 1, 0);
963 mutex_unlock(&root->fs_info->fs_mutex);
964 if (err)
965 goto fail;
966
39279cc3
CM		 967 btrfs_truncate_page(inode->i_mapping, inode->i_size);
968
2bf5a725 969 lock_extent(em_tree, pos, block_end, GFP_NOFS);
39279cc3 970 hole_size = (attr->ia_size - pos + mask) & ~mask;
39279cc3
CM		 971
972 mutex_lock(&root->fs_info->fs_mutex);
973 trans = btrfs_start_transaction(root, 1);
974 btrfs_set_trans_block_group(trans, inode);
2bf5a725 975 err = btrfs_drop_extents(trans, root, inode,
3326d1b0
CM		 976 pos, pos + hole_size, pos,
977 &alloc_hint);
2bf5a725 978
179e29e4
CM		 979 if (alloc_hint != EXTENT_MAP_INLINE) {
980 err = btrfs_insert_file_extent(trans, root,
981 inode->i_ino,
982 pos, 0, 0, hole_size);
983 }
39279cc3
CM		 984 btrfs_end_transaction(trans, root);
985 mutex_unlock(&root->fs_info->fs_mutex);
2bf5a725 986 unlock_extent(em_tree, pos, block_end, GFP_NOFS);
54aa1f4d
CM		 987 if (err)
988 return err;
39279cc3
CM		 989 }
990out:
991 err = inode_setattr(inode, attr);
1832a6d5 992fail:
39279cc3
CM		 993 return err;
994}
61295eb8
CM		 995
996void btrfs_drop_inode(struct inode *inode)
997{
cee36a03 998 if (!BTRFS_I(inode)->ordered_trans || inode->i_nlink) {
61295eb8
CM		 999 generic_drop_inode(inode);
1000 return;
1001 }
cee36a03
CM		 1002 /* FIXME, make sure this delete actually ends up in the transaction */
1003 btrfs_del_ordered_inode(inode);
61295eb8 1004 generic_drop_inode(inode);
61295eb8
CM		 1005}
1006
39279cc3
CM		 1007void btrfs_delete_inode(struct inode *inode)
1008{
1009 struct btrfs_trans_handle *trans;
1010 struct btrfs_root *root = BTRFS_I(inode)->root;
d3c2fdcf 1011 unsigned long nr;
39279cc3
CM		 1012 int ret;
1013
1014 truncate_inode_pages(&inode->i_data, 0);
1015 if (is_bad_inode(inode)) {
1016 goto no_delete;
1017 }
5f39d397 1018
39279cc3
CM		 1019 inode->i_size = 0;
1020 mutex_lock(&root->fs_info->fs_mutex);
1021 trans = btrfs_start_transaction(root, 1);
5f39d397 1022
39279cc3
CM		 1023 btrfs_set_trans_block_group(trans, inode);
1024 ret = btrfs_truncate_in_trans(trans, root, inode);
5103e947
JB		 1025 if (ret)
1026 goto no_delete_lock;
1027 ret = btrfs_delete_xattrs(trans, root, inode);
54aa1f4d
CM		 1028 if (ret)
1029 goto no_delete_lock;
1030 ret = btrfs_free_inode(trans, root, inode);
1031 if (ret)
1032 goto no_delete_lock;
d3c2fdcf 1033 nr = trans->blocks_used;
5f39d397 1034
39279cc3
CM		 1035 btrfs_end_transaction(trans, root);
1036 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1037 btrfs_btree_balance_dirty(root, nr);
e2008b61 1038 btrfs_throttle(root);
39279cc3 1039 return;
54aa1f4d
CM		 1040
1041no_delete_lock:
d3c2fdcf 1042 nr = trans->blocks_used;
54aa1f4d
CM		 1043 btrfs_end_transaction(trans, root);
1044 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1045 btrfs_btree_balance_dirty(root, nr);
e2008b61 1046 btrfs_throttle(root);
39279cc3
CM		 1047no_delete:
1048 clear_inode(inode);
1049}
1050
1051/*
1052 * this returns the key found in the dir entry in the location pointer.
1053 * If no dir entries were found, location->objectid is 0.
1054 */
1055static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1056 struct btrfs_key *location)
1057{
1058 const char *name = dentry->d_name.name;
1059 int namelen = dentry->d_name.len;
1060 struct btrfs_dir_item *di;
1061 struct btrfs_path *path;
1062 struct btrfs_root *root = BTRFS_I(dir)->root;
0d9f7f3e 1063 int ret = 0;
39279cc3 1064
3954401f
CM		 1065 if (namelen == 1 && strcmp(name, ".") == 0) {
1066 location->objectid = dir->i_ino;
1067 location->type = BTRFS_INODE_ITEM_KEY;
1068 location->offset = 0;
1069 return 0;
1070 }
39279cc3
CM		 1071 path = btrfs_alloc_path();
1072 BUG_ON(!path);
3954401f 1073
7a720536 1074 if (namelen == 2 && strcmp(name, "..") == 0) {
3954401f
CM		 1075 struct btrfs_key key;
1076 struct extent_buffer *leaf;
1077 u32 nritems;
1078 int slot;
1079
1080 key.objectid = dir->i_ino;
1081 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1082 key.offset = 0;
1083 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1084 BUG_ON(ret == 0);
1085 ret = 0;
1086
1087 leaf = path->nodes[0];
1088 slot = path->slots[0];
1089 nritems = btrfs_header_nritems(leaf);
1090 if (slot >= nritems)
1091 goto out_err;
1092
1093 btrfs_item_key_to_cpu(leaf, &key, slot);
1094 if (key.objectid != dir->i_ino ||
1095 key.type != BTRFS_INODE_REF_KEY) {
1096 goto out_err;
1097 }
1098 location->objectid = key.offset;
1099 location->type = BTRFS_INODE_ITEM_KEY;
1100 location->offset = 0;
1101 goto out;
1102 }
1103
39279cc3
CM		 1104 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1105 namelen, 0);
0d9f7f3e
Y		 1106 if (IS_ERR(di))
1107 ret = PTR_ERR(di);
39279cc3 1108 if (!di || IS_ERR(di)) {
3954401f 1109 goto out_err;
39279cc3 1110 }
5f39d397 1111 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
39279cc3 1112out:
39279cc3
CM		 1113 btrfs_free_path(path);
1114 return ret;
3954401f
CM		 1115out_err:
1116 location->objectid = 0;
1117 goto out;
39279cc3
CM		 1118}
1119
1120/*
1121 * when we hit a tree root in a directory, the btrfs part of the inode
1122 * needs to be changed to reflect the root directory of the tree root. This
1123 * is kind of like crossing a mount point.
1124 */
1125static int fixup_tree_root_location(struct btrfs_root *root,
1126 struct btrfs_key *location,
58176a96
JB		 1127 struct btrfs_root **sub_root,
1128 struct dentry *dentry)
39279cc3
CM		 1129{
1130 struct btrfs_path *path;
1131 struct btrfs_root_item *ri;
1132
1133 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1134 return 0;
1135 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1136 return 0;
1137
1138 path = btrfs_alloc_path();
1139 BUG_ON(!path);
1140 mutex_lock(&root->fs_info->fs_mutex);
1141
58176a96
JB		 1142 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1143 dentry->d_name.name,
1144 dentry->d_name.len);
39279cc3
CM		 1145 if (IS_ERR(*sub_root))
1146 return PTR_ERR(*sub_root);
1147
1148 ri = &(*sub_root)->root_item;
1149 location->objectid = btrfs_root_dirid(ri);
39279cc3
CM		 1150 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1151 location->offset = 0;
1152
1153 btrfs_free_path(path);
1154 mutex_unlock(&root->fs_info->fs_mutex);
1155 return 0;
1156}
1157
1158static int btrfs_init_locked_inode(struct inode *inode, void *p)
1159{
1160 struct btrfs_iget_args *args = p;
1161 inode->i_ino = args->ino;
1162 BTRFS_I(inode)->root = args->root;
b888db2b
CM		 1163 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1164 inode->i_mapping, GFP_NOFS);
39279cc3
CM		 1165 return 0;
1166}
1167
1168static int btrfs_find_actor(struct inode *inode, void *opaque)
1169{
1170 struct btrfs_iget_args *args = opaque;
1171 return (args->ino == inode->i_ino &&
1172 args->root == BTRFS_I(inode)->root);
1173}
1174
dc17ff8f
CM		 1175struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1176 u64 root_objectid)
1177{
1178 struct btrfs_iget_args args;
1179 args.ino = objectid;
1180 args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);
1181
1182 if (!args.root)
1183 return NULL;
1184
1185 return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
1186}
1187
39279cc3
CM		 1188struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1189 struct btrfs_root *root)
1190{
1191 struct inode *inode;
1192 struct btrfs_iget_args args;
1193 args.ino = objectid;
1194 args.root = root;
1195
1196 inode = iget5_locked(s, objectid, btrfs_find_actor,
1197 btrfs_init_locked_inode,
1198 (void *)&args);
1199 return inode;
1200}
1201
1202static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1203 struct nameidata *nd)
1204{
1205 struct inode * inode;
1206 struct btrfs_inode *bi = BTRFS_I(dir);
1207 struct btrfs_root *root = bi->root;
1208 struct btrfs_root *sub_root = root;
1209 struct btrfs_key location;
1210 int ret;
1211
1212 if (dentry->d_name.len > BTRFS_NAME_LEN)
1213 return ERR_PTR(-ENAMETOOLONG);
5f39d397 1214
39279cc3
CM		 1215 mutex_lock(&root->fs_info->fs_mutex);
1216 ret = btrfs_inode_by_name(dir, dentry, &location);
1217 mutex_unlock(&root->fs_info->fs_mutex);
5f39d397 1218
39279cc3
CM		 1219 if (ret < 0)
1220 return ERR_PTR(ret);
5f39d397 1221
39279cc3
CM		 1222 inode = NULL;
1223 if (location.objectid) {
58176a96
JB		 1224 ret = fixup_tree_root_location(root, &location, &sub_root,
1225 dentry);
39279cc3
CM		 1226 if (ret < 0)
1227 return ERR_PTR(ret);
1228 if (ret > 0)
1229 return ERR_PTR(-ENOENT);
1230 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1231 sub_root);
1232 if (!inode)
1233 return ERR_PTR(-EACCES);
1234 if (inode->i_state & I_NEW) {
1235 /* the inode and parent dir are two different roots */
1236 if (sub_root != root) {
1237 igrab(inode);
1238 sub_root->inode = inode;
1239 }
1240 BTRFS_I(inode)->root = sub_root;
1241 memcpy(&BTRFS_I(inode)->location, &location,
1242 sizeof(location));
1243 btrfs_read_locked_inode(inode);
1244 unlock_new_inode(inode);
1245 }
1246 }
1247 return d_splice_alias(inode, dentry);
1248}
1249
39279cc3
CM		 1250static unsigned char btrfs_filetype_table[] = {
1251 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1252};
1253
1254static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1255{
6da6abae 1256 struct inode *inode = filp->f_dentry->d_inode;
39279cc3
CM		 1257 struct btrfs_root *root = BTRFS_I(inode)->root;
1258 struct btrfs_item *item;
1259 struct btrfs_dir_item *di;
1260 struct btrfs_key key;
5f39d397 1261 struct btrfs_key found_key;
39279cc3
CM		 1262 struct btrfs_path *path;
1263 int ret;
1264 u32 nritems;
5f39d397 1265 struct extent_buffer *leaf;
39279cc3
CM		 1266 int slot;
1267 int advance;
1268 unsigned char d_type;
1269 int over = 0;
1270 u32 di_cur;
1271 u32 di_total;
1272 u32 di_len;
1273 int key_type = BTRFS_DIR_INDEX_KEY;
5f39d397
CM		 1274 char tmp_name[32];
1275 char *name_ptr;
1276 int name_len;
39279cc3
CM		 1277
1278 /* FIXME, use a real flag for deciding about the key type */
1279 if (root->fs_info->tree_root == root)
1280 key_type = BTRFS_DIR_ITEM_KEY;
5f39d397 1281
3954401f
CM		 1282 /* special case for "." */
1283 if (filp->f_pos == 0) {
1284 over = filldir(dirent, ".", 1,
1285 1, inode->i_ino,
1286 DT_DIR);
1287 if (over)
1288 return 0;
1289 filp->f_pos = 1;
1290 }
1291
39279cc3
CM		 1292 mutex_lock(&root->fs_info->fs_mutex);
1293 key.objectid = inode->i_ino;
3954401f
CM		 1294 path = btrfs_alloc_path();
1295 path->reada = 2;
1296
1297 /* special case for .., just use the back ref */
1298 if (filp->f_pos == 1) {
1299 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1300 key.offset = 0;
1301 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1302 BUG_ON(ret == 0);
1303 leaf = path->nodes[0];
1304 slot = path->slots[0];
1305 nritems = btrfs_header_nritems(leaf);
1306 if (slot >= nritems) {
1307 btrfs_release_path(root, path);
1308 goto read_dir_items;
1309 }
1310 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1311 btrfs_release_path(root, path);
1312 if (found_key.objectid != key.objectid ||
1313 found_key.type != BTRFS_INODE_REF_KEY)
1314 goto read_dir_items;
1315 over = filldir(dirent, "..", 2,
1316 2, found_key.offset, DT_DIR);
1317 if (over)
1318 goto nopos;
1319 filp->f_pos = 2;
1320 }
1321
1322read_dir_items:
39279cc3
CM		 1323 btrfs_set_key_type(&key, key_type);
1324 key.offset = filp->f_pos;
5f39d397 1325
39279cc3
CM		 1326 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1327 if (ret < 0)
1328 goto err;
1329 advance = 0;
39279cc3 1330 while(1) {
5f39d397
CM		 1331 leaf = path->nodes[0];
1332 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1333 slot = path->slots[0];
1334 if (advance || slot >= nritems) {
1335 if (slot >= nritems -1) {
39279cc3
CM		 1336 ret = btrfs_next_leaf(root, path);
1337 if (ret)
1338 break;
5f39d397
CM		 1339 leaf = path->nodes[0];
1340 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1341 slot = path->slots[0];
1342 } else {
1343 slot++;
1344 path->slots[0]++;
1345 }
1346 }
1347 advance = 1;
5f39d397
CM		 1348 item = btrfs_item_nr(leaf, slot);
1349 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1350
1351 if (found_key.objectid != key.objectid)
39279cc3 1352 break;
5f39d397 1353 if (btrfs_key_type(&found_key) != key_type)
39279cc3 1354 break;
5f39d397 1355 if (found_key.offset < filp->f_pos)
39279cc3 1356 continue;
5f39d397
CM		 1357
1358 filp->f_pos = found_key.offset;
39279cc3
CM		 1359 advance = 1;
1360 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1361 di_cur = 0;
5f39d397 1362 di_total = btrfs_item_size(leaf, item);
39279cc3 1363 while(di_cur < di_total) {
5f39d397
CM		 1364 struct btrfs_key location;
1365
1366 name_len = btrfs_dir_name_len(leaf, di);
1367 if (name_len < 32) {
1368 name_ptr = tmp_name;
1369 } else {
1370 name_ptr = kmalloc(name_len, GFP_NOFS);
1371 BUG_ON(!name_ptr);
1372 }
1373 read_extent_buffer(leaf, name_ptr,
1374 (unsigned long)(di + 1), name_len);
1375
1376 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1377 btrfs_dir_item_key_to_cpu(leaf, di, &location);
5f39d397
CM		 1378 over = filldir(dirent, name_ptr, name_len,
1379 found_key.offset,
1380 location.objectid,
39279cc3 1381 d_type);
5f39d397
CM		 1382
1383 if (name_ptr != tmp_name)
1384 kfree(name_ptr);
1385
39279cc3
CM		 1386 if (over)
1387 goto nopos;
5103e947
JB		 1388 di_len = btrfs_dir_name_len(leaf, di) +
1389 btrfs_dir_data_len(leaf, di) +sizeof(*di);
39279cc3
CM		 1390 di_cur += di_len;
1391 di = (struct btrfs_dir_item *)((char *)di + di_len);
1392 }
1393 }
1394 filp->f_pos++;
1395nopos:
1396 ret = 0;
1397err:
1398 btrfs_release_path(root, path);
1399 btrfs_free_path(path);
1400 mutex_unlock(&root->fs_info->fs_mutex);
1401 return ret;
1402}
1403
1404int btrfs_write_inode(struct inode *inode, int wait)
1405{
1406 struct btrfs_root *root = BTRFS_I(inode)->root;
1407 struct btrfs_trans_handle *trans;
1408 int ret = 0;
1409
1410 if (wait) {
1411 mutex_lock(&root->fs_info->fs_mutex);
1412 trans = btrfs_start_transaction(root, 1);
1413 btrfs_set_trans_block_group(trans, inode);
1414 ret = btrfs_commit_transaction(trans, root);
1415 mutex_unlock(&root->fs_info->fs_mutex);
1416 }
1417 return ret;
1418}
1419
1420/*
54aa1f4d 1421 * This is somewhat expensive, updating the tree every time the
39279cc3
CM		 1422 * inode changes. But, it is most likely to find the inode in cache.
1423 * FIXME, needs more benchmarking...there are no reasons other than performance
1424 * to keep or drop this code.
1425 */
1426void btrfs_dirty_inode(struct inode *inode)
1427{
1428 struct btrfs_root *root = BTRFS_I(inode)->root;
1429 struct btrfs_trans_handle *trans;
1430
1431 mutex_lock(&root->fs_info->fs_mutex);
1432 trans = btrfs_start_transaction(root, 1);
1433 btrfs_set_trans_block_group(trans, inode);
1434 btrfs_update_inode(trans, root, inode);
1435 btrfs_end_transaction(trans, root);
1436 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 1437}
1438
1439static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1440 struct btrfs_root *root,
1441 u64 objectid,
1442 struct btrfs_block_group_cache *group,
1443 int mode)
1444{
1445 struct inode *inode;
5f39d397 1446 struct btrfs_inode_item *inode_item;
39279cc3 1447 struct btrfs_key *location;
5f39d397 1448 struct btrfs_path *path;
39279cc3
CM		 1449 int ret;
1450 int owner;
1451
5f39d397
CM		 1452 path = btrfs_alloc_path();
1453 BUG_ON(!path);
1454
39279cc3
CM		 1455 inode = new_inode(root->fs_info->sb);
1456 if (!inode)
1457 return ERR_PTR(-ENOMEM);
1458
b888db2b
CM		 1459 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1460 inode->i_mapping, GFP_NOFS);
39279cc3 1461 BTRFS_I(inode)->root = root;
b888db2b 1462
39279cc3
CM		 1463 if (mode & S_IFDIR)
1464 owner = 0;
1465 else
1466 owner = 1;
1467 group = btrfs_find_block_group(root, group, 0, 0, owner);
1468 BTRFS_I(inode)->block_group = group;
b98b6767 1469 BTRFS_I(inode)->flags = 0;
5f39d397
CM		 1470 ret = btrfs_insert_empty_inode(trans, root, path, objectid);
1471 if (ret)
1472 goto fail;
1473
39279cc3
CM		 1474 inode->i_uid = current->fsuid;
1475 inode->i_gid = current->fsgid;
1476 inode->i_mode = mode;
1477 inode->i_ino = objectid;
1478 inode->i_blocks = 0;
1479 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
5f39d397
CM		 1480 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1481 struct btrfs_inode_item);
1482 fill_inode_item(path->nodes[0], inode_item, inode);
1483 btrfs_mark_buffer_dirty(path->nodes[0]);
1484 btrfs_free_path(path);
1485
39279cc3
CM		 1486 location = &BTRFS_I(inode)->location;
1487 location->objectid = objectid;
39279cc3
CM		 1488 location->offset = 0;
1489 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1490
39279cc3
CM		 1491 insert_inode_hash(inode);
1492 return inode;
5f39d397
CM		 1493fail:
1494 btrfs_free_path(path);
1495 return ERR_PTR(ret);
39279cc3
CM		 1496}
1497
1498static inline u8 btrfs_inode_type(struct inode *inode)
1499{
1500 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1501}
1502
1503static int btrfs_add_link(struct btrfs_trans_handle *trans,
1504 struct dentry *dentry, struct inode *inode)
1505{
1506 int ret;
1507 struct btrfs_key key;
1508 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
79c44584 1509 struct inode *parent_inode;
5f39d397 1510
39279cc3 1511 key.objectid = inode->i_ino;
39279cc3
CM		 1512 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1513 key.offset = 0;
1514
1515 ret = btrfs_insert_dir_item(trans, root,
1516 dentry->d_name.name, dentry->d_name.len,
1517 dentry->d_parent->d_inode->i_ino,
1518 &key, btrfs_inode_type(inode));
1519 if (ret == 0) {
76fea00a
CM		 1520 ret = btrfs_insert_inode_ref(trans, root,
1521 dentry->d_name.name,
1522 dentry->d_name.len,
1523 inode->i_ino,
1524 dentry->d_parent->d_inode->i_ino);
79c44584
CM		 1525 parent_inode = dentry->d_parent->d_inode;
1526 parent_inode->i_size += dentry->d_name.len * 2;
1527 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
39279cc3
CM		 1528 ret = btrfs_update_inode(trans, root,
1529 dentry->d_parent->d_inode);
1530 }
1531 return ret;
1532}
1533
1534static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1535 struct dentry *dentry, struct inode *inode)
1536{
1537 int err = btrfs_add_link(trans, dentry, inode);
1538 if (!err) {
1539 d_instantiate(dentry, inode);
1540 return 0;
1541 }
1542 if (err > 0)
1543 err = -EEXIST;
1544 return err;
1545}
1546
618e21d5
JB		 1547static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1548 int mode, dev_t rdev)
1549{
1550 struct btrfs_trans_handle *trans;
1551 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1552 struct inode *inode = NULL;
618e21d5
JB		 1553 int err;
1554 int drop_inode = 0;
1555 u64 objectid;
1832a6d5 1556 unsigned long nr = 0;
618e21d5
JB		 1557
1558 if (!new_valid_dev(rdev))
1559 return -EINVAL;
1560
1561 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1562 err = btrfs_check_free_space(root, 1, 0);
1563 if (err)
1564 goto fail;
1565
618e21d5
JB		 1566 trans = btrfs_start_transaction(root, 1);
1567 btrfs_set_trans_block_group(trans, dir);
1568
1569 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1570 if (err) {
1571 err = -ENOSPC;
1572 goto out_unlock;
1573 }
1574
1575 inode = btrfs_new_inode(trans, root, objectid,
1576 BTRFS_I(dir)->block_group, mode);
1577 err = PTR_ERR(inode);
1578 if (IS_ERR(inode))
1579 goto out_unlock;
1580
1581 btrfs_set_trans_block_group(trans, inode);
1582 err = btrfs_add_nondir(trans, dentry, inode);
1583 if (err)
1584 drop_inode = 1;
1585 else {
1586 inode->i_op = &btrfs_special_inode_operations;
1587 init_special_inode(inode, inode->i_mode, rdev);
1b4ab1bb 1588 btrfs_update_inode(trans, root, inode);
618e21d5
JB		 1589 }
1590 dir->i_sb->s_dirt = 1;
1591 btrfs_update_inode_block_group(trans, inode);
1592 btrfs_update_inode_block_group(trans, dir);
1593out_unlock:
d3c2fdcf 1594 nr = trans->blocks_used;
618e21d5 1595 btrfs_end_transaction(trans, root);
1832a6d5 1596fail:
618e21d5
JB		 1597 mutex_unlock(&root->fs_info->fs_mutex);
1598
1599 if (drop_inode) {
1600 inode_dec_link_count(inode);
1601 iput(inode);
1602 }
d3c2fdcf 1603 btrfs_btree_balance_dirty(root, nr);
e2008b61 1604 btrfs_throttle(root);
618e21d5
JB		 1605 return err;
1606}
1607
39279cc3
CM		 1608static int btrfs_create(struct inode *dir, struct dentry *dentry,
1609 int mode, struct nameidata *nd)
1610{
1611 struct btrfs_trans_handle *trans;
1612 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1613 struct inode *inode = NULL;
39279cc3
CM		 1614 int err;
1615 int drop_inode = 0;
1832a6d5 1616 unsigned long nr = 0;
39279cc3
CM		 1617 u64 objectid;
1618
1619 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1620 err = btrfs_check_free_space(root, 1, 0);
1621 if (err)
1622 goto fail;
39279cc3
CM		 1623 trans = btrfs_start_transaction(root, 1);
1624 btrfs_set_trans_block_group(trans, dir);
1625
1626 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1627 if (err) {
1628 err = -ENOSPC;
1629 goto out_unlock;
1630 }
1631
1632 inode = btrfs_new_inode(trans, root, objectid,
1633 BTRFS_I(dir)->block_group, mode);
1634 err = PTR_ERR(inode);
1635 if (IS_ERR(inode))
1636 goto out_unlock;
1637
1638 btrfs_set_trans_block_group(trans, inode);
1639 err = btrfs_add_nondir(trans, dentry, inode);
1640 if (err)
1641 drop_inode = 1;
1642 else {
1643 inode->i_mapping->a_ops = &btrfs_aops;
1644 inode->i_fop = &btrfs_file_operations;
1645 inode->i_op = &btrfs_file_inode_operations;
a52d9a80
CM		 1646 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1647 inode->i_mapping, GFP_NOFS);
07157aac 1648 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
39279cc3
CM		 1649 }
1650 dir->i_sb->s_dirt = 1;
1651 btrfs_update_inode_block_group(trans, inode);
1652 btrfs_update_inode_block_group(trans, dir);
1653out_unlock:
d3c2fdcf 1654 nr = trans->blocks_used;
39279cc3 1655 btrfs_end_transaction(trans, root);
1832a6d5 1656fail:
39279cc3
CM		 1657 mutex_unlock(&root->fs_info->fs_mutex);
1658
1659 if (drop_inode) {
1660 inode_dec_link_count(inode);
1661 iput(inode);
1662 }
d3c2fdcf 1663 btrfs_btree_balance_dirty(root, nr);
e2008b61 1664 btrfs_throttle(root);
39279cc3
CM		 1665 return err;
1666}
1667
1668static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1669 struct dentry *dentry)
1670{
1671 struct btrfs_trans_handle *trans;
1672 struct btrfs_root *root = BTRFS_I(dir)->root;
1673 struct inode *inode = old_dentry->d_inode;
1832a6d5 1674 unsigned long nr = 0;
39279cc3
CM		 1675 int err;
1676 int drop_inode = 0;
1677
1678 if (inode->i_nlink == 0)
1679 return -ENOENT;
1680
6da6abae
CM		 1681#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1682 inode->i_nlink++;
1683#else
39279cc3 1684 inc_nlink(inode);
6da6abae 1685#endif
39279cc3 1686 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1687 err = btrfs_check_free_space(root, 1, 0);
1688 if (err)
1689 goto fail;
39279cc3 1690 trans = btrfs_start_transaction(root, 1);
5f39d397 1691
39279cc3
CM		 1692 btrfs_set_trans_block_group(trans, dir);
1693 atomic_inc(&inode->i_count);
1694 err = btrfs_add_nondir(trans, dentry, inode);
5f39d397 1695
39279cc3
CM		 1696 if (err)
1697 drop_inode = 1;
5f39d397 1698
39279cc3
CM		 1699 dir->i_sb->s_dirt = 1;
1700 btrfs_update_inode_block_group(trans, dir);
54aa1f4d 1701 err = btrfs_update_inode(trans, root, inode);
5f39d397 1702
54aa1f4d
CM		 1703 if (err)
1704 drop_inode = 1;
39279cc3 1705
d3c2fdcf 1706 nr = trans->blocks_used;
39279cc3 1707 btrfs_end_transaction(trans, root);
1832a6d5 1708fail:
39279cc3
CM		 1709 mutex_unlock(&root->fs_info->fs_mutex);
1710
1711 if (drop_inode) {
1712 inode_dec_link_count(inode);
1713 iput(inode);
1714 }
d3c2fdcf 1715 btrfs_btree_balance_dirty(root, nr);
e2008b61 1716 btrfs_throttle(root);
39279cc3
CM		 1717 return err;
1718}
1719
39279cc3
CM		 1720static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1721{
1722 struct inode *inode;
1723 struct btrfs_trans_handle *trans;
1724 struct btrfs_root *root = BTRFS_I(dir)->root;
1725 int err = 0;
1726 int drop_on_err = 0;
1727 u64 objectid;
d3c2fdcf 1728 unsigned long nr = 1;
39279cc3
CM		 1729
1730 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1731 err = btrfs_check_free_space(root, 1, 0);
1732 if (err)
1733 goto out_unlock;
1734
39279cc3
CM		 1735 trans = btrfs_start_transaction(root, 1);
1736 btrfs_set_trans_block_group(trans, dir);
5f39d397 1737
39279cc3
CM		 1738 if (IS_ERR(trans)) {
1739 err = PTR_ERR(trans);
1740 goto out_unlock;
1741 }
1742
1743 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1744 if (err) {
1745 err = -ENOSPC;
1746 goto out_unlock;
1747 }
1748
1749 inode = btrfs_new_inode(trans, root, objectid,
1750 BTRFS_I(dir)->block_group, S_IFDIR | mode);
1751 if (IS_ERR(inode)) {
1752 err = PTR_ERR(inode);
1753 goto out_fail;
1754 }
5f39d397 1755
39279cc3
CM		 1756 drop_on_err = 1;
1757 inode->i_op = &btrfs_dir_inode_operations;
1758 inode->i_fop = &btrfs_dir_file_operations;
1759 btrfs_set_trans_block_group(trans, inode);
1760
3954401f 1761 inode->i_size = 0;
39279cc3
CM		 1762 err = btrfs_update_inode(trans, root, inode);
1763 if (err)
1764 goto out_fail;
5f39d397 1765
39279cc3
CM		 1766 err = btrfs_add_link(trans, dentry, inode);
1767 if (err)
1768 goto out_fail;
5f39d397 1769
39279cc3
CM		 1770 d_instantiate(dentry, inode);
1771 drop_on_err = 0;
1772 dir->i_sb->s_dirt = 1;
1773 btrfs_update_inode_block_group(trans, inode);
1774 btrfs_update_inode_block_group(trans, dir);
1775
1776out_fail:
d3c2fdcf 1777 nr = trans->blocks_used;
39279cc3 1778 btrfs_end_transaction(trans, root);
5f39d397 1779
39279cc3
CM		 1780out_unlock:
1781 mutex_unlock(&root->fs_info->fs_mutex);
1782 if (drop_on_err)
1783 iput(inode);
d3c2fdcf 1784 btrfs_btree_balance_dirty(root, nr);
e2008b61 1785 btrfs_throttle(root);
39279cc3
CM		 1786 return err;
1787}
1788
a52d9a80
CM		 1789struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1790 size_t page_offset, u64 start, u64 end,
1791 int create)
1792{
1793 int ret;
1794 int err = 0;
db94535d 1795 u64 bytenr;
a52d9a80
CM		 1796 u64 extent_start = 0;
1797 u64 extent_end = 0;
1798 u64 objectid = inode->i_ino;
1799 u32 found_type;
1800 int failed_insert = 0;
1801 struct btrfs_path *path;
1802 struct btrfs_root *root = BTRFS_I(inode)->root;
1803 struct btrfs_file_extent_item *item;
5f39d397
CM		 1804 struct extent_buffer *leaf;
1805 struct btrfs_key found_key;
a52d9a80
CM		 1806 struct extent_map *em = NULL;
1807 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1808 struct btrfs_trans_handle *trans = NULL;
1809
1810 path = btrfs_alloc_path();
1811 BUG_ON(!path);
1812 mutex_lock(&root->fs_info->fs_mutex);
1813
1814again:
1815 em = lookup_extent_mapping(em_tree, start, end);
1816 if (em) {
56b453c9
CM		 1817 if (em->start > start) {
1818 printk("get_extent start %Lu em start %Lu\n",
1819 start, em->start);
1820 WARN_ON(1);
1821 }
a52d9a80
CM		 1822 goto out;
1823 }
1824 if (!em) {
1825 em = alloc_extent_map(GFP_NOFS);
1826 if (!em) {
1827 err = -ENOMEM;
1828 goto out;
1829 }
5f39d397
CM		 1830 em->start = EXTENT_MAP_HOLE;
1831 em->end = EXTENT_MAP_HOLE;
a52d9a80
CM		 1832 }
1833 em->bdev = inode->i_sb->s_bdev;
179e29e4
CM		 1834 ret = btrfs_lookup_file_extent(trans, root, path,
1835 objectid, start, trans != NULL);
a52d9a80
CM		 1836 if (ret < 0) {
1837 err = ret;
1838 goto out;
1839 }
1840
1841 if (ret != 0) {
1842 if (path->slots[0] == 0)
1843 goto not_found;
1844 path->slots[0]--;
1845 }
1846
5f39d397
CM		 1847 leaf = path->nodes[0];
1848 item = btrfs_item_ptr(leaf, path->slots[0],
a52d9a80 1849 struct btrfs_file_extent_item);
a52d9a80 1850 /* are we inside the extent that was found? */
5f39d397
CM		 1851 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1852 found_type = btrfs_key_type(&found_key);
1853 if (found_key.objectid != objectid ||
a52d9a80
CM		 1854 found_type != BTRFS_EXTENT_DATA_KEY) {
1855 goto not_found;
1856 }
1857
5f39d397
CM		 1858 found_type = btrfs_file_extent_type(leaf, item);
1859 extent_start = found_key.offset;
a52d9a80
CM		 1860 if (found_type == BTRFS_FILE_EXTENT_REG) {
1861 extent_end = extent_start +
db94535d 1862 btrfs_file_extent_num_bytes(leaf, item);
a52d9a80 1863 err = 0;
b888db2b 1864 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 1865 em->start = start;
1866 if (start < extent_start) {
b888db2b
CM		 1867 if (end < extent_start)
1868 goto not_found;
a52d9a80
CM		 1869 em->end = extent_end - 1;
1870 } else {
1871 em->end = end;
1872 }
1873 goto not_found_em;
1874 }
db94535d
CM		 1875 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
1876 if (bytenr == 0) {
a52d9a80
CM		 1877 em->start = extent_start;
1878 em->end = extent_end - 1;
5f39d397
CM		 1879 em->block_start = EXTENT_MAP_HOLE;
1880 em->block_end = EXTENT_MAP_HOLE;
a52d9a80
CM		 1881 goto insert;
1882 }
db94535d
CM		 1883 bytenr += btrfs_file_extent_offset(leaf, item);
1884 em->block_start = bytenr;
a52d9a80 1885 em->block_end = em->block_start +
db94535d 1886 btrfs_file_extent_num_bytes(leaf, item) - 1;
a52d9a80
CM		 1887 em->start = extent_start;
1888 em->end = extent_end - 1;
1889 goto insert;
1890 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
5f39d397 1891 unsigned long ptr;
a52d9a80 1892 char *map;
3326d1b0
CM		 1893 size_t size;
1894 size_t extent_offset;
1895 size_t copy_size;
a52d9a80 1896
5f39d397
CM		 1897 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
1898 path->slots[0]));
689f9346 1899 extent_end = (extent_start + size - 1) |
db94535d 1900 ((u64)root->sectorsize - 1);
b888db2b 1901 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 1902 em->start = start;
1903 if (start < extent_start) {
b888db2b
CM		 1904 if (end < extent_start)
1905 goto not_found;
50b78c24 1906 em->end = extent_end;
a52d9a80
CM		 1907 } else {
1908 em->end = end;
1909 }
1910 goto not_found_em;
1911 }
689f9346
Y		 1912 em->block_start = EXTENT_MAP_INLINE;
1913 em->block_end = EXTENT_MAP_INLINE;
1914
1915 if (!page) {
1916 em->start = extent_start;
1917 em->end = extent_start + size - 1;
1918 goto out;
1919 }
5f39d397 1920
35ebb934 1921 extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) -
689f9346 1922 extent_start + page_offset;
ae2f5411 1923 copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset,
3326d1b0 1924 size - extent_offset);
3326d1b0
CM		 1925 em->start = extent_start + extent_offset;
1926 em->end = (em->start + copy_size -1) |
1927 ((u64)root->sectorsize -1);
689f9346
Y		 1928 map = kmap(page);
1929 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
179e29e4
CM		 1930 if (create == 0 && !PageUptodate(page)) {
1931 read_extent_buffer(leaf, map + page_offset, ptr,
1932 copy_size);
1933 flush_dcache_page(page);
1934 } else if (create && PageUptodate(page)) {
1935 if (!trans) {
1936 kunmap(page);
1937 free_extent_map(em);
1938 em = NULL;
1939 btrfs_release_path(root, path);
1940 trans = btrfs_start_transaction(root, 1);
1941 goto again;
1942 }
1943 write_extent_buffer(leaf, map + page_offset, ptr,
1944 copy_size);
1945 btrfs_mark_buffer_dirty(leaf);
a52d9a80 1946 }
a52d9a80 1947 kunmap(page);
3326d1b0 1948 set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS);
a52d9a80
CM		 1949 goto insert;
1950 } else {
1951 printk("unkknown found_type %d\n", found_type);
1952 WARN_ON(1);
1953 }
1954not_found:
1955 em->start = start;
1956 em->end = end;
1957not_found_em:
5f39d397
CM		 1958 em->block_start = EXTENT_MAP_HOLE;
1959 em->block_end = EXTENT_MAP_HOLE;
a52d9a80
CM		 1960insert:
1961 btrfs_release_path(root, path);
1962 if (em->start > start || em->end < start) {
b888db2b 1963 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end);
a52d9a80
CM		 1964 err = -EIO;
1965 goto out;
1966 }
1967 ret = add_extent_mapping(em_tree, em);
1968 if (ret == -EEXIST) {
1969 free_extent_map(em);
2bf5a725 1970 em = NULL;
6da6abae
CM		 1971 if (0 && failed_insert == 1) {
1972 btrfs_drop_extent_cache(inode, start, end);
1973 }
a52d9a80
CM		 1974 failed_insert++;
1975 if (failed_insert > 5) {
1976 printk("failing to insert %Lu %Lu\n", start, end);
1977 err = -EIO;
1978 goto out;
1979 }
a52d9a80
CM		 1980 goto again;
1981 }
1982 err = 0;
1983out:
1984 btrfs_free_path(path);
1985 if (trans) {
1986 ret = btrfs_end_transaction(trans, root);
1987 if (!err)
1988 err = ret;
1989 }
1990 mutex_unlock(&root->fs_info->fs_mutex);
1991 if (err) {
1992 free_extent_map(em);
1993 WARN_ON(1);
1994 return ERR_PTR(err);
1995 }
1996 return em;
1997}
1998
d396c6f5 1999static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
39279cc3 2000{
d396c6f5 2001 return extent_bmap(mapping, iblock, btrfs_get_extent);
39279cc3
CM		 2002}
2003
a52d9a80 2004int btrfs_readpage(struct file *file, struct page *page)
9ebefb18 2005{
a52d9a80
CM		 2006 struct extent_map_tree *tree;
2007 tree = &BTRFS_I(page->mapping->host)->extent_tree;
2008 return extent_read_full_page(tree, page, btrfs_get_extent);
9ebefb18 2009}
1832a6d5 2010
a52d9a80 2011static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
39279cc3 2012{
a52d9a80 2013 struct extent_map_tree *tree;
b888db2b
CM		 2014
2015
2016 if (current->flags & PF_MEMALLOC) {
2017 redirty_page_for_writepage(wbc, page);
2018 unlock_page(page);
2019 return 0;
2020 }
a52d9a80
CM		 2021 tree = &BTRFS_I(page->mapping->host)->extent_tree;
2022 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
9ebefb18
CM		 2023}
2024
b293f02e
CM		 2025static int btrfs_writepages(struct address_space *mapping,
2026 struct writeback_control *wbc)
2027{
2028 struct extent_map_tree *tree;
2029 tree = &BTRFS_I(mapping->host)->extent_tree;
2030 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2031}
2032
3ab2fb5a
CM		 2033static int
2034btrfs_readpages(struct file *file, struct address_space *mapping,
2035 struct list_head *pages, unsigned nr_pages)
2036{
2037 struct extent_map_tree *tree;
2038 tree = &BTRFS_I(mapping->host)->extent_tree;
2039 return extent_readpages(tree, mapping, pages, nr_pages,
2040 btrfs_get_extent);
2041}
2042
a52d9a80 2043static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
9ebefb18 2044{
a52d9a80
CM		 2045 struct extent_map_tree *tree;
2046 int ret;
8c2383c3 2047
a52d9a80
CM		 2048 tree = &BTRFS_I(page->mapping->host)->extent_tree;
2049 ret = try_release_extent_mapping(tree, page);
2050 if (ret == 1) {
2051 ClearPagePrivate(page);
2052 set_page_private(page, 0);
2053 page_cache_release(page);
39279cc3 2054 }
a52d9a80 2055 return ret;
39279cc3
CM		 2056}
2057
a52d9a80 2058static void btrfs_invalidatepage(struct page *page, unsigned long offset)
39279cc3 2059{
a52d9a80 2060 struct extent_map_tree *tree;
39279cc3 2061
a52d9a80
CM		 2062 tree = &BTRFS_I(page->mapping->host)->extent_tree;
2063 extent_invalidatepage(tree, page, offset);
2064 btrfs_releasepage(page, GFP_NOFS);
39279cc3
CM		 2065}
2066
9ebefb18
CM		 2067/*
2068 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2069 * called from a page fault handler when a page is first dirtied. Hence we must
2070 * be careful to check for EOF conditions here. We set the page up correctly
2071 * for a written page which means we get ENOSPC checking when writing into
2072 * holes and correct delalloc and unwritten extent mapping on filesystems that
2073 * support these features.
2074 *
2075 * We are not allowed to take the i_mutex here so we have to play games to
2076 * protect against truncate races as the page could now be beyond EOF. Because
2077 * vmtruncate() writes the inode size before removing pages, once we have the
2078 * page lock we can determine safely if the page is beyond EOF. If it is not
2079 * beyond EOF, then the page is guaranteed safe against truncation until we
2080 * unlock the page.
2081 */
2082int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2083{
6da6abae 2084 struct inode *inode = fdentry(vma->vm_file)->d_inode;
1832a6d5 2085 struct btrfs_root *root = BTRFS_I(inode)->root;
9ebefb18
CM		 2086 unsigned long end;
2087 loff_t size;
1832a6d5 2088 int ret;
a52d9a80 2089 u64 page_start;
9ebefb18 2090
1832a6d5
CM		 2091 mutex_lock(&root->fs_info->fs_mutex);
2092 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
8f662a76 2093 mutex_unlock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2094 if (ret)
2095 goto out;
2096
2097 ret = -EINVAL;
2098
9ebefb18
CM		 2099 lock_page(page);
2100 wait_on_page_writeback(page);
9ebefb18 2101 size = i_size_read(inode);
35ebb934 2102 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 2103
9ebefb18 2104 if ((page->mapping != inode->i_mapping) ||
a52d9a80 2105 (page_start > size)) {
9ebefb18
CM		 2106 /* page got truncated out from underneath us */
2107 goto out_unlock;
2108 }
2109
2110 /* page is wholly or partially inside EOF */
a52d9a80 2111 if (page_start + PAGE_CACHE_SIZE > size)
9ebefb18
CM		 2112 end = size & ~PAGE_CACHE_MASK;
2113 else
2114 end = PAGE_CACHE_SIZE;
2115
b888db2b 2116 ret = btrfs_cow_one_page(inode, page, end);
9ebefb18
CM		 2117
2118out_unlock:
2119 unlock_page(page);
1832a6d5 2120out:
9ebefb18
CM		 2121 return ret;
2122}
2123
39279cc3
CM		 2124static void btrfs_truncate(struct inode *inode)
2125{
2126 struct btrfs_root *root = BTRFS_I(inode)->root;
2127 int ret;
2128 struct btrfs_trans_handle *trans;
d3c2fdcf 2129 unsigned long nr;
39279cc3
CM		 2130
2131 if (!S_ISREG(inode->i_mode))
2132 return;
2133 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2134 return;
2135
2136 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2137
2138 mutex_lock(&root->fs_info->fs_mutex);
2139 trans = btrfs_start_transaction(root, 1);
2140 btrfs_set_trans_block_group(trans, inode);
2141
2142 /* FIXME, add redo link to tree so we don't leak on crash */
2143 ret = btrfs_truncate_in_trans(trans, root, inode);
39279cc3 2144 btrfs_update_inode(trans, root, inode);
d3c2fdcf 2145 nr = trans->blocks_used;
5f39d397 2146
39279cc3
CM		 2147 ret = btrfs_end_transaction(trans, root);
2148 BUG_ON(ret);
2149 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2150 btrfs_btree_balance_dirty(root, nr);
e2008b61 2151 btrfs_throttle(root);
39279cc3
CM		 2152}
2153
4313b399
CM		 2154static int noinline create_subvol(struct btrfs_root *root, char *name,
2155 int namelen)
39279cc3
CM		 2156{
2157 struct btrfs_trans_handle *trans;
2158 struct btrfs_key key;
2159 struct btrfs_root_item root_item;
2160 struct btrfs_inode_item *inode_item;
5f39d397 2161 struct extent_buffer *leaf;
dc17ff8f 2162 struct btrfs_root *new_root = root;
39279cc3
CM		 2163 struct inode *inode;
2164 struct inode *dir;
2165 int ret;
54aa1f4d 2166 int err;
39279cc3
CM		 2167 u64 objectid;
2168 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
d3c2fdcf 2169 unsigned long nr = 1;
39279cc3
CM		 2170
2171 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2172 ret = btrfs_check_free_space(root, 1, 0);
2173 if (ret)
2174 goto fail_commit;
2175
39279cc3
CM		 2176 trans = btrfs_start_transaction(root, 1);
2177 BUG_ON(!trans);
2178
7bb86316
CM		 2179 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2180 0, &objectid);
2181 if (ret)
2182 goto fail;
2183
2184 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2185 objectid, trans->transid, 0, 0,
2186 0, 0);
5f39d397
CM		 2187 if (IS_ERR(leaf))
2188 return PTR_ERR(leaf);
2189
2190 btrfs_set_header_nritems(leaf, 0);
2191 btrfs_set_header_level(leaf, 0);
db94535d 2192 btrfs_set_header_bytenr(leaf, leaf->start);
5f39d397 2193 btrfs_set_header_generation(leaf, trans->transid);
7bb86316
CM		 2194 btrfs_set_header_owner(leaf, objectid);
2195
5f39d397
CM		 2196 write_extent_buffer(leaf, root->fs_info->fsid,
2197 (unsigned long)btrfs_header_fsid(leaf),
2198 BTRFS_FSID_SIZE);
2199 btrfs_mark_buffer_dirty(leaf);
39279cc3
CM		 2200
2201 inode_item = &root_item.inode;
2202 memset(inode_item, 0, sizeof(*inode_item));
5f39d397
CM		 2203 inode_item->generation = cpu_to_le64(1);
2204 inode_item->size = cpu_to_le64(3);
2205 inode_item->nlink = cpu_to_le32(1);
2206 inode_item->nblocks = cpu_to_le64(1);
2207 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
39279cc3 2208
db94535d
CM		 2209 btrfs_set_root_bytenr(&root_item, leaf->start);
2210 btrfs_set_root_level(&root_item, 0);
39279cc3 2211 btrfs_set_root_refs(&root_item, 1);
5f39d397
CM		 2212 btrfs_set_root_used(&root_item, 0);
2213
5eda7b5e
CM		 2214 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2215 root_item.drop_level = 0;
5f39d397
CM		 2216
2217 free_extent_buffer(leaf);
2218 leaf = NULL;
39279cc3 2219
39279cc3
CM		 2220 btrfs_set_root_dirid(&root_item, new_dirid);
2221
2222 key.objectid = objectid;
2223 key.offset = 1;
39279cc3
CM		 2224 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2225 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2226 &root_item);
54aa1f4d
CM		 2227 if (ret)
2228 goto fail;
39279cc3
CM		 2229
2230 /*
2231 * insert the directory item
2232 */
2233 key.offset = (u64)-1;
2234 dir = root->fs_info->sb->s_root->d_inode;
2235 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2236 name, namelen, dir->i_ino, &key,
2237 BTRFS_FT_DIR);
54aa1f4d
CM		 2238 if (ret)
2239 goto fail;
39279cc3 2240
3954401f
CM		 2241 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2242 name, namelen, objectid,
2243 root->fs_info->sb->s_root->d_inode->i_ino);
2244 if (ret)
2245 goto fail;
2246
39279cc3 2247 ret = btrfs_commit_transaction(trans, root);
54aa1f4d
CM		 2248 if (ret)
2249 goto fail_commit;
39279cc3 2250
58176a96 2251 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
39279cc3
CM		 2252 BUG_ON(!new_root);
2253
2254 trans = btrfs_start_transaction(new_root, 1);
2255 BUG_ON(!trans);
2256
2257 inode = btrfs_new_inode(trans, new_root, new_dirid,
2258 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
54aa1f4d
CM		 2259 if (IS_ERR(inode))
2260 goto fail;
39279cc3
CM		 2261 inode->i_op = &btrfs_dir_inode_operations;
2262 inode->i_fop = &btrfs_dir_file_operations;
34088780 2263 new_root->inode = inode;
39279cc3 2264
3954401f
CM		 2265 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2266 new_dirid);
39279cc3 2267 inode->i_nlink = 1;
3954401f 2268 inode->i_size = 0;
39279cc3 2269 ret = btrfs_update_inode(trans, new_root, inode);
54aa1f4d
CM		 2270 if (ret)
2271 goto fail;
2272fail:
d3c2fdcf 2273 nr = trans->blocks_used;
dc17ff8f 2274 err = btrfs_commit_transaction(trans, new_root);
54aa1f4d
CM		 2275 if (err && !ret)
2276 ret = err;
2277fail_commit:
39279cc3 2278 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2279 btrfs_btree_balance_dirty(root, nr);
e2008b61 2280 btrfs_throttle(root);
54aa1f4d 2281 return ret;
39279cc3
CM		 2282}
2283
2284static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2285{
3063d29f 2286 struct btrfs_pending_snapshot *pending_snapshot;
39279cc3 2287 struct btrfs_trans_handle *trans;
39279cc3 2288 int ret;
54aa1f4d 2289 int err;
1832a6d5 2290 unsigned long nr = 0;
39279cc3
CM		 2291
2292 if (!root->ref_cows)
2293 return -EINVAL;
2294
2295 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2296 ret = btrfs_check_free_space(root, 1, 0);
2297 if (ret)
2298 goto fail_unlock;
2299
3063d29f
CM		 2300 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
2301 if (!pending_snapshot) {
2302 ret = -ENOMEM;
2303 goto fail_unlock;
2304 }
2305 pending_snapshot->name = kstrndup(name, namelen, GFP_NOFS);
2306 if (!pending_snapshot->name) {
2307 ret = -ENOMEM;
2308 kfree(pending_snapshot);
2309 goto fail_unlock;
2310 }
39279cc3
CM		 2311 trans = btrfs_start_transaction(root, 1);
2312 BUG_ON(!trans);
2313
3063d29f
CM		 2314 pending_snapshot->root = root;
2315 list_add(&pending_snapshot->list,
2316 &trans->transaction->pending_snapshots);
39279cc3 2317 ret = btrfs_update_inode(trans, root, root->inode);
54aa1f4d 2318 err = btrfs_commit_transaction(trans, root);
5f39d397 2319
1832a6d5 2320fail_unlock:
39279cc3 2321 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2322 btrfs_btree_balance_dirty(root, nr);
e2008b61 2323 btrfs_throttle(root);
54aa1f4d 2324 return ret;
39279cc3
CM		 2325}
2326
edbd8d4e 2327unsigned long btrfs_force_ra(struct address_space *mapping,
86479a04
CM		 2328 struct file_ra_state *ra, struct file *file,
2329 pgoff_t offset, pgoff_t last_index)
2330{
2331 pgoff_t req_size;
2332
2333#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2334 req_size = last_index - offset + 1;
2335 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2336 return offset;
2337#else
2338 req_size = min(last_index - offset + 1, (pgoff_t)128);
2339 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2340 return offset + req_size;
2341#endif
2342}
2343
2344int btrfs_defrag_file(struct file *file) {
6da6abae 2345 struct inode *inode = fdentry(file)->d_inode;
1832a6d5 2346 struct btrfs_root *root = BTRFS_I(inode)->root;
86479a04
CM		 2347 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
2348 struct page *page;
2349 unsigned long last_index;
2350 unsigned long ra_index = 0;
2351 u64 page_start;
2352 u64 page_end;
edbd8d4e
CM		 2353 u64 delalloc_start;
2354 u64 existing_delalloc;
86479a04 2355 unsigned long i;
1832a6d5
CM		 2356 int ret;
2357
2358 mutex_lock(&root->fs_info->fs_mutex);
2359 ret = btrfs_check_free_space(root, inode->i_size, 0);
2360 mutex_unlock(&root->fs_info->fs_mutex);
2361 if (ret)
2362 return -ENOSPC;
86479a04
CM		 2363
2364 mutex_lock(&inode->i_mutex);
2365 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2366 for (i = 0; i <= last_index; i++) {
2367 if (i == ra_index) {
edbd8d4e
CM		 2368 ra_index = btrfs_force_ra(inode->i_mapping,
2369 &file->f_ra,
2370 file, ra_index, last_index);
86479a04
CM		 2371 }
2372 page = grab_cache_page(inode->i_mapping, i);
2373 if (!page)
2374 goto out_unlock;
2375 if (!PageUptodate(page)) {
2376 btrfs_readpage(NULL, page);
2377 lock_page(page);
2378 if (!PageUptodate(page)) {
2379 unlock_page(page);
2380 page_cache_release(page);
2381 goto out_unlock;
2382 }
2383 }
35ebb934 2384 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
86479a04
CM		 2385 page_end = page_start + PAGE_CACHE_SIZE - 1;
2386
2387 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
edbd8d4e
CM		 2388 delalloc_start = page_start;
2389 existing_delalloc =
2390 count_range_bits(&BTRFS_I(inode)->extent_tree,
2391 &delalloc_start, page_end,
2392 PAGE_CACHE_SIZE, EXTENT_DELALLOC);
86479a04
CM		 2393 set_extent_delalloc(em_tree, page_start,
2394 page_end, GFP_NOFS);
edbd8d4e
CM		 2395
2396 spin_lock(&root->fs_info->delalloc_lock);
2397 root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE -
2398 existing_delalloc;
2399 spin_unlock(&root->fs_info->delalloc_lock);
2400
86479a04
CM		 2401 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
2402 set_page_dirty(page);
2403 unlock_page(page);
2404 page_cache_release(page);
2405 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2406 }
2407
2408out_unlock:
2409 mutex_unlock(&inode->i_mutex);
2410 return 0;
2411}
2412
edbd8d4e
CM		 2413static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2414{
2415 u64 new_size;
2416 u64 old_size;
2417 struct btrfs_ioctl_vol_args *vol_args;
2418 struct btrfs_trans_handle *trans;
2419 char *sizestr;
2420 int ret = 0;
2421 int namelen;
2422 int mod = 0;
2423
2424 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2425
2426 if (!vol_args)
2427 return -ENOMEM;
2428
2429 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2430 ret = -EFAULT;
2431 goto out;
2432 }
2433 namelen = strlen(vol_args->name);
2434 if (namelen > BTRFS_VOL_NAME_MAX) {
2435 ret = -EINVAL;
2436 goto out;
2437 }
2438
2439 sizestr = vol_args->name;
2440 if (!strcmp(sizestr, "max"))
2441 new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
2442 else {
2443 if (sizestr[0] == '-') {
2444 mod = -1;
2445 sizestr++;
2446 } else if (sizestr[0] == '+') {
2447 mod = 1;
2448 sizestr++;
2449 }
2450 new_size = btrfs_parse_size(sizestr);
2451 if (new_size == 0) {
2452 ret = -EINVAL;
2453 goto out;
2454 }
2455 }
2456
2457 mutex_lock(&root->fs_info->fs_mutex);
2458 old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);
2459
2460 if (mod < 0) {
2461 if (new_size > old_size) {
2462 ret = -EINVAL;
2463 goto out_unlock;
2464 }
2465 new_size = old_size - new_size;
2466 } else if (mod > 0) {
2467 new_size = old_size + new_size;
2468 }
2469
2470 if (new_size < 256 * 1024 * 1024) {
2471 ret = -EINVAL;
2472 goto out_unlock;
2473 }
2474 if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
2475 ret = -EFBIG;
2476 goto out_unlock;
2477 }
f9ef6604
CM		 2478
2479 do_div(new_size, root->sectorsize);
2480 new_size *= root->sectorsize;
edbd8d4e
CM		 2481
2482printk("new size is %Lu\n", new_size);
2483 if (new_size > old_size) {
2484 trans = btrfs_start_transaction(root, 1);
2485 ret = btrfs_grow_extent_tree(trans, root, new_size);
2486 btrfs_commit_transaction(trans, root);
2487 } else {
2488 ret = btrfs_shrink_extent_tree(root, new_size);
2489 }
2490
2491out_unlock:
2492 mutex_unlock(&root->fs_info->fs_mutex);
2493out:
2494 kfree(vol_args);
2495 return ret;
2496}
2497
4313b399
CM		 2498static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
2499 void __user *arg)
39279cc3 2500{
4aec2b52 2501 struct btrfs_ioctl_vol_args *vol_args;
39279cc3 2502 struct btrfs_dir_item *di;
39279cc3
CM		 2503 struct btrfs_path *path;
2504 u64 root_dirid;
4aec2b52
CM		 2505 int namelen;
2506 int ret;
39279cc3 2507
4aec2b52 2508 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
5f39d397 2509
4aec2b52
CM		 2510 if (!vol_args)
2511 return -ENOMEM;
2512
2513 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2514 ret = -EFAULT;
2515 goto out;
2516 }
2517
2518 namelen = strlen(vol_args->name);
2519 if (namelen > BTRFS_VOL_NAME_MAX) {
2520 ret = -EINVAL;
2521 goto out;
2522 }
2523 if (strchr(vol_args->name, '/')) {
2524 ret = -EINVAL;
2525 goto out;
2526 }
d03581f4
CH		 2527
2528 path = btrfs_alloc_path();
4aec2b52
CM		 2529 if (!path) {
2530 ret = -ENOMEM;
2531 goto out;
2532 }
d03581f4
CH		 2533
2534 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2535 mutex_lock(&root->fs_info->fs_mutex);
2536 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2537 path, root_dirid,
4aec2b52 2538 vol_args->name, namelen, 0);
d03581f4
CH		 2539 mutex_unlock(&root->fs_info->fs_mutex);
2540 btrfs_free_path(path);
4aec2b52
CM		 2541
2542 if (di && !IS_ERR(di)) {
2543 ret = -EEXIST;
2544 goto out;
2545 }
2546
2547 if (IS_ERR(di)) {
2548 ret = PTR_ERR(di);
2549 goto out;
2550 }
d03581f4
CH		 2551
2552 if (root == root->fs_info->tree_root)
4aec2b52
CM		 2553 ret = create_subvol(root, vol_args->name, namelen);
2554 else
2555 ret = create_snapshot(root, vol_args->name, namelen);
2556out:
2557 kfree(vol_args);
2558 return ret;
d03581f4
CH		 2559}
2560
2561static int btrfs_ioctl_defrag(struct file *file)
2562{
6da6abae 2563 struct inode *inode = fdentry(file)->d_inode;
d03581f4
CH		 2564 struct btrfs_root *root = BTRFS_I(inode)->root;
2565
2566 switch (inode->i_mode & S_IFMT) {
2567 case S_IFDIR:
39279cc3 2568 mutex_lock(&root->fs_info->fs_mutex);
d03581f4
CH		 2569 btrfs_defrag_root(root, 0);
2570 btrfs_defrag_root(root->fs_info->extent_root, 0);
39279cc3 2571 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3 2572 break;
d03581f4
CH		 2573 case S_IFREG:
2574 btrfs_defrag_file(file);
2575 break;
2576 }
2577
2578 return 0;
2579}
6702ed49 2580
d03581f4
CH		 2581long btrfs_ioctl(struct file *file, unsigned int
2582 cmd, unsigned long arg)
2583{
6da6abae 2584 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
d03581f4
CH		 2585
2586 switch (cmd) {
2587 case BTRFS_IOC_SNAP_CREATE:
2588 return btrfs_ioctl_snap_create(root, (void __user *)arg);
6702ed49 2589 case BTRFS_IOC_DEFRAG:
d03581f4 2590 return btrfs_ioctl_defrag(file);
edbd8d4e
CM		 2591 case BTRFS_IOC_RESIZE:
2592 return btrfs_ioctl_resize(root, (void __user *)arg);
39279cc3 2593 }
d03581f4
CH		 2594
2595 return -ENOTTY;
39279cc3
CM		 2596}
2597
39279cc3
CM		 2598/*
2599 * Called inside transaction, so use GFP_NOFS
2600 */
2601struct inode *btrfs_alloc_inode(struct super_block *sb)
2602{
2603 struct btrfs_inode *ei;
2604
2605 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2606 if (!ei)
2607 return NULL;
15ee9bc7 2608 ei->last_trans = 0;
dc17ff8f 2609 ei->ordered_trans = 0;
39279cc3
CM		 2610 return &ei->vfs_inode;
2611}
2612
2613void btrfs_destroy_inode(struct inode *inode)
2614{
2615 WARN_ON(!list_empty(&inode->i_dentry));
2616 WARN_ON(inode->i_data.nrpages);
2617
8c416c9e 2618 btrfs_drop_extent_cache(inode, 0, (u64)-1);
39279cc3
CM		 2619 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2620}
2621
44ec0b71
CM		 2622#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2623static void init_once(struct kmem_cache * cachep, void *foo)
2624#else
39279cc3
CM		 2625static void init_once(void * foo, struct kmem_cache * cachep,
2626 unsigned long flags)
44ec0b71 2627#endif
39279cc3
CM		 2628{
2629 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2630
2631 inode_init_once(&ei->vfs_inode);
2632}
2633
2634void btrfs_destroy_cachep(void)
2635{
2636 if (btrfs_inode_cachep)
2637 kmem_cache_destroy(btrfs_inode_cachep);
2638 if (btrfs_trans_handle_cachep)
2639 kmem_cache_destroy(btrfs_trans_handle_cachep);
2640 if (btrfs_transaction_cachep)
2641 kmem_cache_destroy(btrfs_transaction_cachep);
2642 if (btrfs_bit_radix_cachep)
2643 kmem_cache_destroy(btrfs_bit_radix_cachep);
2644 if (btrfs_path_cachep)
2645 kmem_cache_destroy(btrfs_path_cachep);
2646}
2647
86479a04 2648struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
92fee66d 2649 unsigned long extra_flags,
44ec0b71
CM		 2650#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2651 void (*ctor)(struct kmem_cache *, void *)
2652#else
92fee66d 2653 void (*ctor)(void *, struct kmem_cache *,
44ec0b71
CM		 2654 unsigned long)
2655#endif
2656 )
92fee66d
CM		 2657{
2658 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2659 SLAB_MEM_SPREAD | extra_flags), ctor
2660#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2661 ,NULL
2662#endif
2663 );
2664}
2665
39279cc3
CM		 2666int btrfs_init_cachep(void)
2667{
86479a04 2668 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
92fee66d
CM		 2669 sizeof(struct btrfs_inode),
2670 0, init_once);
39279cc3
CM		 2671 if (!btrfs_inode_cachep)
2672 goto fail;
86479a04
CM		 2673 btrfs_trans_handle_cachep =
2674 btrfs_cache_create("btrfs_trans_handle_cache",
2675 sizeof(struct btrfs_trans_handle),
2676 0, NULL);
39279cc3
CM		 2677 if (!btrfs_trans_handle_cachep)
2678 goto fail;
86479a04 2679 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
39279cc3 2680 sizeof(struct btrfs_transaction),
92fee66d 2681 0, NULL);
39279cc3
CM		 2682 if (!btrfs_transaction_cachep)
2683 goto fail;
86479a04 2684 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
23223584 2685 sizeof(struct btrfs_path),
92fee66d 2686 0, NULL);
39279cc3
CM		 2687 if (!btrfs_path_cachep)
2688 goto fail;
86479a04 2689 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
92fee66d 2690 SLAB_DESTROY_BY_RCU, NULL);
39279cc3
CM		 2691 if (!btrfs_bit_radix_cachep)
2692 goto fail;
2693 return 0;
2694fail:
2695 btrfs_destroy_cachep();
2696 return -ENOMEM;
2697}
2698
2699static int btrfs_getattr(struct vfsmount *mnt,
2700 struct dentry *dentry, struct kstat *stat)
2701{
2702 struct inode *inode = dentry->d_inode;
2703 generic_fillattr(inode, stat);
d6667462 2704 stat->blksize = PAGE_CACHE_SIZE;
39279cc3
CM		 2705 return 0;
2706}
2707
2708static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
2709 struct inode * new_dir,struct dentry *new_dentry)
2710{
2711 struct btrfs_trans_handle *trans;
2712 struct btrfs_root *root = BTRFS_I(old_dir)->root;
2713 struct inode *new_inode = new_dentry->d_inode;
2714 struct inode *old_inode = old_dentry->d_inode;
2715 struct timespec ctime = CURRENT_TIME;
2716 struct btrfs_path *path;
39279cc3
CM		 2717 int ret;
2718
2719 if (S_ISDIR(old_inode->i_mode) && new_inode &&
2720 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
2721 return -ENOTEMPTY;
2722 }
5f39d397 2723
39279cc3 2724 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2725 ret = btrfs_check_free_space(root, 1, 0);
2726 if (ret)
2727 goto out_unlock;
2728
39279cc3 2729 trans = btrfs_start_transaction(root, 1);
5f39d397 2730
39279cc3
CM		 2731 btrfs_set_trans_block_group(trans, new_dir);
2732 path = btrfs_alloc_path();
2733 if (!path) {
2734 ret = -ENOMEM;
2735 goto out_fail;
2736 }
2737
2738 old_dentry->d_inode->i_nlink++;
2739 old_dir->i_ctime = old_dir->i_mtime = ctime;
2740 new_dir->i_ctime = new_dir->i_mtime = ctime;
2741 old_inode->i_ctime = ctime;
5f39d397 2742
39279cc3
CM		 2743 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
2744 if (ret)
2745 goto out_fail;
2746
2747 if (new_inode) {
2748 new_inode->i_ctime = CURRENT_TIME;
2749 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
2750 if (ret)
2751 goto out_fail;
39279cc3
CM		 2752 }
2753 ret = btrfs_add_link(trans, new_dentry, old_inode);
2754 if (ret)
2755 goto out_fail;
2756
2757out_fail:
2758 btrfs_free_path(path);
2759 btrfs_end_transaction(trans, root);
1832a6d5 2760out_unlock:
39279cc3
CM		 2761 mutex_unlock(&root->fs_info->fs_mutex);
2762 return ret;
2763}
2764
2765static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
2766 const char *symname)
2767{
2768 struct btrfs_trans_handle *trans;
2769 struct btrfs_root *root = BTRFS_I(dir)->root;
2770 struct btrfs_path *path;
2771 struct btrfs_key key;
1832a6d5 2772 struct inode *inode = NULL;
39279cc3
CM		 2773 int err;
2774 int drop_inode = 0;
2775 u64 objectid;
2776 int name_len;
2777 int datasize;
5f39d397 2778 unsigned long ptr;
39279cc3 2779 struct btrfs_file_extent_item *ei;
5f39d397 2780 struct extent_buffer *leaf;
1832a6d5 2781 unsigned long nr = 0;
39279cc3
CM		 2782
2783 name_len = strlen(symname) + 1;
2784 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
2785 return -ENAMETOOLONG;
1832a6d5 2786
39279cc3 2787 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2788 err = btrfs_check_free_space(root, 1, 0);
2789 if (err)
2790 goto out_fail;
2791
39279cc3
CM		 2792 trans = btrfs_start_transaction(root, 1);
2793 btrfs_set_trans_block_group(trans, dir);
2794
2795 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2796 if (err) {
2797 err = -ENOSPC;
2798 goto out_unlock;
2799 }
2800
2801 inode = btrfs_new_inode(trans, root, objectid,
2802 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
2803 err = PTR_ERR(inode);
2804 if (IS_ERR(inode))
2805 goto out_unlock;
2806
2807 btrfs_set_trans_block_group(trans, inode);
2808 err = btrfs_add_nondir(trans, dentry, inode);
2809 if (err)
2810 drop_inode = 1;
2811 else {
2812 inode->i_mapping->a_ops = &btrfs_aops;
2813 inode->i_fop = &btrfs_file_operations;
2814 inode->i_op = &btrfs_file_inode_operations;
a52d9a80
CM		 2815 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
2816 inode->i_mapping, GFP_NOFS);
07157aac 2817 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
39279cc3
CM		 2818 }
2819 dir->i_sb->s_dirt = 1;
2820 btrfs_update_inode_block_group(trans, inode);
2821 btrfs_update_inode_block_group(trans, dir);
2822 if (drop_inode)
2823 goto out_unlock;
2824
2825 path = btrfs_alloc_path();
2826 BUG_ON(!path);
2827 key.objectid = inode->i_ino;
2828 key.offset = 0;
39279cc3
CM		 2829 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2830 datasize = btrfs_file_extent_calc_inline_size(name_len);
2831 err = btrfs_insert_empty_item(trans, root, path, &key,
2832 datasize);
54aa1f4d
CM		 2833 if (err) {
2834 drop_inode = 1;
2835 goto out_unlock;
2836 }
5f39d397
CM		 2837 leaf = path->nodes[0];
2838 ei = btrfs_item_ptr(leaf, path->slots[0],
2839 struct btrfs_file_extent_item);
2840 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
2841 btrfs_set_file_extent_type(leaf, ei,
39279cc3
CM		 2842 BTRFS_FILE_EXTENT_INLINE);
2843 ptr = btrfs_file_extent_inline_start(ei);
5f39d397
CM		 2844 write_extent_buffer(leaf, symname, ptr, name_len);
2845 btrfs_mark_buffer_dirty(leaf);
39279cc3 2846 btrfs_free_path(path);
5f39d397 2847
39279cc3
CM		 2848 inode->i_op = &btrfs_symlink_inode_operations;
2849 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2850 inode->i_size = name_len - 1;
54aa1f4d
CM		 2851 err = btrfs_update_inode(trans, root, inode);
2852 if (err)
2853 drop_inode = 1;
39279cc3
CM		 2854
2855out_unlock:
d3c2fdcf 2856 nr = trans->blocks_used;
39279cc3 2857 btrfs_end_transaction(trans, root);
1832a6d5 2858out_fail:
39279cc3 2859 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 2860 if (drop_inode) {
2861 inode_dec_link_count(inode);
2862 iput(inode);
2863 }
d3c2fdcf 2864 btrfs_btree_balance_dirty(root, nr);
e2008b61 2865 btrfs_throttle(root);
39279cc3
CM		 2866 return err;
2867}
fdebe2bd
Y		 2868static int btrfs_permission(struct inode *inode, int mask,
2869 struct nameidata *nd)
2870{
2871 if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
2872 return -EACCES;
2873 return generic_permission(inode, mask, NULL);
2874}
39279cc3
CM		 2875
2876static struct inode_operations btrfs_dir_inode_operations = {
2877 .lookup = btrfs_lookup,
2878 .create = btrfs_create,
2879 .unlink = btrfs_unlink,
2880 .link = btrfs_link,
2881 .mkdir = btrfs_mkdir,
2882 .rmdir = btrfs_rmdir,
2883 .rename = btrfs_rename,
2884 .symlink = btrfs_symlink,
2885 .setattr = btrfs_setattr,
618e21d5 2886 .mknod = btrfs_mknod,
5103e947
JB		 2887 .setxattr = generic_setxattr,
2888 .getxattr = generic_getxattr,
2889 .listxattr = btrfs_listxattr,
2890 .removexattr = generic_removexattr,
fdebe2bd 2891 .permission = btrfs_permission,
39279cc3 2892};
39279cc3
CM		 2893static struct inode_operations btrfs_dir_ro_inode_operations = {
2894 .lookup = btrfs_lookup,
fdebe2bd 2895 .permission = btrfs_permission,
39279cc3 2896};
39279cc3
CM		 2897static struct file_operations btrfs_dir_file_operations = {
2898 .llseek = generic_file_llseek,
2899 .read = generic_read_dir,
2900 .readdir = btrfs_readdir,
34287aa3 2901 .unlocked_ioctl = btrfs_ioctl,
39279cc3 2902#ifdef CONFIG_COMPAT
34287aa3 2903 .compat_ioctl = btrfs_ioctl,
39279cc3
CM		 2904#endif
2905};
2906
07157aac
CM		 2907static struct extent_map_ops btrfs_extent_map_ops = {
2908 .fill_delalloc = run_delalloc_range,
2909 .writepage_io_hook = btrfs_writepage_io_hook,
2910 .readpage_io_hook = btrfs_readpage_io_hook,
2911 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
2912};
2913
39279cc3
CM		 2914static struct address_space_operations btrfs_aops = {
2915 .readpage = btrfs_readpage,
2916 .writepage = btrfs_writepage,
b293f02e 2917 .writepages = btrfs_writepages,
3ab2fb5a 2918 .readpages = btrfs_readpages,
39279cc3 2919 .sync_page = block_sync_page,
39279cc3 2920 .bmap = btrfs_bmap,
a52d9a80
CM		 2921 .invalidatepage = btrfs_invalidatepage,
2922 .releasepage = btrfs_releasepage,
2923 .set_page_dirty = __set_page_dirty_nobuffers,
39279cc3
CM		 2924};
2925
2926static struct address_space_operations btrfs_symlink_aops = {
2927 .readpage = btrfs_readpage,
2928 .writepage = btrfs_writepage,
2bf5a725
CM		 2929 .invalidatepage = btrfs_invalidatepage,
2930 .releasepage = btrfs_releasepage,
39279cc3
CM		 2931};
2932
2933static struct inode_operations btrfs_file_inode_operations = {
2934 .truncate = btrfs_truncate,
2935 .getattr = btrfs_getattr,
2936 .setattr = btrfs_setattr,
5103e947
JB		 2937 .setxattr = generic_setxattr,
2938 .getxattr = generic_getxattr,
2939 .listxattr = btrfs_listxattr,
2940 .removexattr = generic_removexattr,
fdebe2bd 2941 .permission = btrfs_permission,
39279cc3 2942};
618e21d5
JB		 2943static struct inode_operations btrfs_special_inode_operations = {
2944 .getattr = btrfs_getattr,
2945 .setattr = btrfs_setattr,
fdebe2bd 2946 .permission = btrfs_permission,
618e21d5 2947};
39279cc3
CM		 2948static struct inode_operations btrfs_symlink_inode_operations = {
2949 .readlink = generic_readlink,
2950 .follow_link = page_follow_link_light,
2951 .put_link = page_put_link,
fdebe2bd 2952 .permission = btrfs_permission,
39279cc3 2953};
Linux 6.x block layer and io_uring tree(s)