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Btrfs: Align extent length to sectorsize in
[linux-2.6-block.git] / fs / btrfs / inode.c
CommitLineData
6cbd5570
CM		 1/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
39279cc3
CM		 19#include <linux/buffer_head.h>
20#include <linux/fs.h>
21#include <linux/pagemap.h>
22#include <linux/highmem.h>
23#include <linux/time.h>
24#include <linux/init.h>
25#include <linux/string.h>
26#include <linux/smp_lock.h>
27#include <linux/backing-dev.h>
28#include <linux/mpage.h>
29#include <linux/swap.h>
30#include <linux/writeback.h>
31#include <linux/statfs.h>
32#include <linux/compat.h>
9ebefb18 33#include <linux/bit_spinlock.h>
92fee66d 34#include <linux/version.h>
5103e947 35#include <linux/xattr.h>
39279cc3
CM		 36#include "ctree.h"
37#include "disk-io.h"
38#include "transaction.h"
39#include "btrfs_inode.h"
40#include "ioctl.h"
41#include "print-tree.h"
42
43struct btrfs_iget_args {
44 u64 ino;
45 struct btrfs_root *root;
46};
47
48static struct inode_operations btrfs_dir_inode_operations;
49static struct inode_operations btrfs_symlink_inode_operations;
50static struct inode_operations btrfs_dir_ro_inode_operations;
618e21d5 51static struct inode_operations btrfs_special_inode_operations;
39279cc3
CM		 52static struct inode_operations btrfs_file_inode_operations;
53static struct address_space_operations btrfs_aops;
54static struct address_space_operations btrfs_symlink_aops;
55static struct file_operations btrfs_dir_file_operations;
d1310b2e 56static struct extent_io_ops btrfs_extent_io_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
83 if (for_del)
f9ef6604 84 thresh = total * 90;
1832a6d5 85 else
f9ef6604
CM		 86 thresh = total * 85;
87
88 do_div(thresh, 100);
1832a6d5
CM		 89
90 spin_lock(&root->fs_info->delalloc_lock);
91 if (used + root->fs_info->delalloc_bytes + num_required > thresh)
92 ret = -ENOSPC;
93 spin_unlock(&root->fs_info->delalloc_lock);
94 return ret;
95}
96
be20aa9d 97static int cow_file_range(struct inode *inode, u64 start, u64 end)
b888db2b
CM		 98{
99 struct btrfs_root *root = BTRFS_I(inode)->root;
100 struct btrfs_trans_handle *trans;
b888db2b 101 u64 alloc_hint = 0;
db94535d 102 u64 num_bytes;
c59f8951 103 u64 cur_alloc_size;
db94535d 104 u64 blocksize = root->sectorsize;
d1310b2e
CM		 105 u64 orig_start = start;
106 u64 orig_num_bytes;
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);
d1310b2e 118 orig_num_bytes = num_bytes;
db94535d 119
179e29e4
CM		 120 if (alloc_hint == EXTENT_MAP_INLINE)
121 goto out;
122
c59f8951
CM		 123 while(num_bytes > 0) {
124 cur_alloc_size = min(num_bytes, root->fs_info->max_extent);
125 ret = btrfs_alloc_extent(trans, root, cur_alloc_size,
126 root->root_key.objectid,
127 trans->transid,
128 inode->i_ino, start, 0,
129 alloc_hint, (u64)-1, &ins, 1);
130 if (ret) {
131 WARN_ON(1);
132 goto out;
133 }
134 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
135 start, ins.objectid, ins.offset,
136 ins.offset);
5f56406a 137 btrfs_check_file(root, inode);
c59f8951
CM		 138 num_bytes -= cur_alloc_size;
139 alloc_hint = ins.objectid + ins.offset;
140 start += cur_alloc_size;
b888db2b 141 }
d1310b2e
CM		 142 btrfs_drop_extent_cache(inode, orig_start,
143 orig_start + orig_num_bytes - 1);
dc17ff8f 144 btrfs_add_ordered_inode(inode);
b888db2b
CM		 145out:
146 btrfs_end_transaction(trans, root);
be20aa9d
CM		 147 return ret;
148}
149
150static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end)
151{
152 u64 extent_start;
153 u64 extent_end;
154 u64 bytenr;
155 u64 cow_end;
1832a6d5 156 u64 loops = 0;
c31f8830 157 u64 total_fs_bytes;
be20aa9d
CM		 158 struct btrfs_root *root = BTRFS_I(inode)->root;
159 struct extent_buffer *leaf;
160 int found_type;
161 struct btrfs_path *path;
162 struct btrfs_file_extent_item *item;
163 int ret;
164 int err;
165 struct btrfs_key found_key;
166
c31f8830 167 total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
be20aa9d
CM		 168 path = btrfs_alloc_path();
169 BUG_ON(!path);
170again:
171 ret = btrfs_lookup_file_extent(NULL, root, path,
172 inode->i_ino, start, 0);
173 if (ret < 0) {
174 btrfs_free_path(path);
175 return ret;
176 }
177
178 cow_end = end;
179 if (ret != 0) {
180 if (path->slots[0] == 0)
181 goto not_found;
182 path->slots[0]--;
183 }
184
185 leaf = path->nodes[0];
186 item = btrfs_item_ptr(leaf, path->slots[0],
187 struct btrfs_file_extent_item);
188
189 /* are we inside the extent that was found? */
190 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
191 found_type = btrfs_key_type(&found_key);
192 if (found_key.objectid != inode->i_ino ||
193 found_type != BTRFS_EXTENT_DATA_KEY) {
194 goto not_found;
195 }
196
197 found_type = btrfs_file_extent_type(leaf, item);
198 extent_start = found_key.offset;
199 if (found_type == BTRFS_FILE_EXTENT_REG) {
c31f8830
CM		 200 u64 extent_num_bytes;
201
202 extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item);
203 extent_end = extent_start + extent_num_bytes;
be20aa9d
CM		 204 err = 0;
205
1832a6d5
CM		 206 if (loops && start != extent_start)
207 goto not_found;
208
be20aa9d
CM		 209 if (start < extent_start || start >= extent_end)
210 goto not_found;
211
212 cow_end = min(end, extent_end - 1);
213 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
214 if (bytenr == 0)
215 goto not_found;
216
c31f8830
CM		 217 /*
218 * we may be called by the resizer, make sure we're inside
219 * the limits of the FS
220 */
221 if (bytenr + extent_num_bytes > total_fs_bytes)
222 goto not_found;
223
be20aa9d
CM		 224 if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) {
225 goto not_found;
226 }
227
228 start = extent_end;
bd09835d 229 } else {
be20aa9d
CM		 230 goto not_found;
231 }
232loop:
233 if (start > end) {
234 btrfs_free_path(path);
235 return 0;
236 }
237 btrfs_release_path(root, path);
1832a6d5 238 loops++;
be20aa9d
CM		 239 goto again;
240
241not_found:
242 cow_file_range(inode, start, cow_end);
243 start = cow_end + 1;
244 goto loop;
245}
246
247static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
248{
249 struct btrfs_root *root = BTRFS_I(inode)->root;
250 int ret;
be20aa9d 251 mutex_lock(&root->fs_info->fs_mutex);
b98b6767
Y		 252 if (btrfs_test_opt(root, NODATACOW) ||
253 btrfs_test_flag(inode, NODATACOW))
be20aa9d
CM		 254 ret = run_delalloc_nocow(inode, start, end);
255 else
256 ret = cow_file_range(inode, start, end);
1832a6d5 257
b888db2b
CM		 258 mutex_unlock(&root->fs_info->fs_mutex);
259 return ret;
260}
261
291d673e
CM		 262int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
263 unsigned long bits)
264{
265 if ((bits & EXTENT_DELALLOC)) {
266 struct btrfs_root *root = BTRFS_I(inode)->root;
267 spin_lock(&root->fs_info->delalloc_lock);
268 root->fs_info->delalloc_bytes += end - start + 1;
269 spin_unlock(&root->fs_info->delalloc_lock);
270 }
271 return 0;
272}
273
274int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
275 unsigned long bits)
276{
277 if ((bits & EXTENT_DELALLOC)) {
278 struct btrfs_root *root = BTRFS_I(inode)->root;
279 spin_lock(&root->fs_info->delalloc_lock);
280 root->fs_info->delalloc_bytes -= end - start + 1;
281 spin_unlock(&root->fs_info->delalloc_lock);
282 }
283 return 0;
284}
285
07157aac
CM		 286int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end)
287{
288 struct inode *inode = page->mapping->host;
289 struct btrfs_root *root = BTRFS_I(inode)->root;
290 struct btrfs_trans_handle *trans;
291 char *kaddr;
b6cda9bc 292 int ret = 0;
35ebb934 293 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
07157aac 294 size_t offset = start - page_start;
b98b6767
Y		 295 if (btrfs_test_opt(root, NODATASUM) ||
296 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 297 return 0;
07157aac
CM		 298 mutex_lock(&root->fs_info->fs_mutex);
299 trans = btrfs_start_transaction(root, 1);
300 btrfs_set_trans_block_group(trans, inode);
301 kaddr = kmap(page);
f578d4bd 302 btrfs_csum_file_block(trans, root, inode, inode->i_ino,
07157aac
CM		 303 start, kaddr + offset, end - start + 1);
304 kunmap(page);
305 ret = btrfs_end_transaction(trans, root);
306 BUG_ON(ret);
307 mutex_unlock(&root->fs_info->fs_mutex);
308 return ret;
309}
310
311int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
312{
313 int ret = 0;
314 struct inode *inode = page->mapping->host;
315 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 316 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
07157aac
CM		 317 struct btrfs_csum_item *item;
318 struct btrfs_path *path = NULL;
ff79f819 319 u32 csum;
b98b6767
Y		 320 if (btrfs_test_opt(root, NODATASUM) ||
321 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 322 return 0;
07157aac
CM		 323 mutex_lock(&root->fs_info->fs_mutex);
324 path = btrfs_alloc_path();
325 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
326 if (IS_ERR(item)) {
327 ret = PTR_ERR(item);
328 /* a csum that isn't present is a preallocated region. */
329 if (ret == -ENOENT || ret == -EFBIG)
330 ret = 0;
ff79f819 331 csum = 0;
aadfeb6e 332 printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start);
07157aac
CM		 333 goto out;
334 }
ff79f819
CM		 335 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
336 BTRFS_CRC32_SIZE);
d1310b2e 337 set_state_private(io_tree, start, csum);
07157aac
CM		 338out:
339 if (path)
340 btrfs_free_path(path);
341 mutex_unlock(&root->fs_info->fs_mutex);
342 return ret;
343}
344
70dec807
CM		 345int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
346 struct extent_state *state)
07157aac 347{
35ebb934 348 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
07157aac 349 struct inode *inode = page->mapping->host;
d1310b2e 350 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
07157aac 351 char *kaddr;
aadfeb6e 352 u64 private = ~(u32)0;
07157aac 353 int ret;
ff79f819
CM		 354 struct btrfs_root *root = BTRFS_I(inode)->root;
355 u32 csum = ~(u32)0;
bbf0d006 356 unsigned long flags;
d1310b2e 357
b98b6767
Y		 358 if (btrfs_test_opt(root, NODATASUM) ||
359 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 360 return 0;
d1310b2e 361
70dec807
CM		 362 if (state->start == start) {
363 private = state->private;
364 ret = 0;
365 } else {
366 ret = get_state_private(io_tree, start, &private);
367 }
bbf0d006 368 local_irq_save(flags);
07157aac
CM		 369 kaddr = kmap_atomic(page, KM_IRQ0);
370 if (ret) {
371 goto zeroit;
372 }
ff79f819
CM		 373 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
374 btrfs_csum_final(csum, (char *)&csum);
375 if (csum != private) {
07157aac
CM		 376 goto zeroit;
377 }
378 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 379 local_irq_restore(flags);
07157aac
CM		 380 return 0;
381
382zeroit:
aadfeb6e
CM		 383 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
384 page->mapping->host->i_ino, (unsigned long long)start, csum,
385 private);
db94535d
CM		 386 memset(kaddr + offset, 1, end - start + 1);
387 flush_dcache_page(page);
07157aac 388 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 389 local_irq_restore(flags);
07157aac
CM		 390 return 0;
391}
b888db2b 392
39279cc3
CM		 393void btrfs_read_locked_inode(struct inode *inode)
394{
395 struct btrfs_path *path;
5f39d397 396 struct extent_buffer *leaf;
39279cc3 397 struct btrfs_inode_item *inode_item;
5f39d397 398 struct btrfs_inode_timespec *tspec;
39279cc3
CM		 399 struct btrfs_root *root = BTRFS_I(inode)->root;
400 struct btrfs_key location;
401 u64 alloc_group_block;
618e21d5 402 u32 rdev;
39279cc3
CM		 403 int ret;
404
405 path = btrfs_alloc_path();
406 BUG_ON(!path);
39279cc3 407 mutex_lock(&root->fs_info->fs_mutex);
39279cc3 408 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
dc17ff8f 409
39279cc3 410 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
5f39d397 411 if (ret)
39279cc3 412 goto make_bad;
39279cc3 413
5f39d397
CM		 414 leaf = path->nodes[0];
415 inode_item = btrfs_item_ptr(leaf, path->slots[0],
416 struct btrfs_inode_item);
417
418 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
419 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
420 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
421 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
422 inode->i_size = btrfs_inode_size(leaf, inode_item);
423
424 tspec = btrfs_inode_atime(inode_item);
425 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
426 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
427
428 tspec = btrfs_inode_mtime(inode_item);
429 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
430 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
431
432 tspec = btrfs_inode_ctime(inode_item);
433 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
434 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
435
436 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
437 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
618e21d5 438 inode->i_rdev = 0;
5f39d397
CM		 439 rdev = btrfs_inode_rdev(leaf, inode_item);
440
441 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
39279cc3
CM		 442 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
443 alloc_group_block);
b98b6767 444 BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
e52ec0eb
CM		 445 if (!BTRFS_I(inode)->block_group) {
446 BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
447 NULL, 0, 0, 0);
448 }
39279cc3
CM		 449 btrfs_free_path(path);
450 inode_item = NULL;
451
452 mutex_unlock(&root->fs_info->fs_mutex);
453
454 switch (inode->i_mode & S_IFMT) {
39279cc3
CM		 455 case S_IFREG:
456 inode->i_mapping->a_ops = &btrfs_aops;
d1310b2e 457 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 458 inode->i_fop = &btrfs_file_operations;
459 inode->i_op = &btrfs_file_inode_operations;
460 break;
461 case S_IFDIR:
462 inode->i_fop = &btrfs_dir_file_operations;
463 if (root == root->fs_info->tree_root)
464 inode->i_op = &btrfs_dir_ro_inode_operations;
465 else
466 inode->i_op = &btrfs_dir_inode_operations;
467 break;
468 case S_IFLNK:
469 inode->i_op = &btrfs_symlink_inode_operations;
470 inode->i_mapping->a_ops = &btrfs_symlink_aops;
471 break;
618e21d5
JB		 472 default:
473 init_special_inode(inode, inode->i_mode, rdev);
474 break;
39279cc3
CM		 475 }
476 return;
477
478make_bad:
479 btrfs_release_path(root, path);
480 btrfs_free_path(path);
481 mutex_unlock(&root->fs_info->fs_mutex);
482 make_bad_inode(inode);
483}
484
5f39d397
CM		 485static void fill_inode_item(struct extent_buffer *leaf,
486 struct btrfs_inode_item *item,
39279cc3
CM		 487 struct inode *inode)
488{
5f39d397
CM		 489 btrfs_set_inode_uid(leaf, item, inode->i_uid);
490 btrfs_set_inode_gid(leaf, item, inode->i_gid);
491 btrfs_set_inode_size(leaf, item, inode->i_size);
492 btrfs_set_inode_mode(leaf, item, inode->i_mode);
493 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
494
495 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
496 inode->i_atime.tv_sec);
497 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
498 inode->i_atime.tv_nsec);
499
500 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
501 inode->i_mtime.tv_sec);
502 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
503 inode->i_mtime.tv_nsec);
504
505 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
506 inode->i_ctime.tv_sec);
507 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
508 inode->i_ctime.tv_nsec);
509
510 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
511 btrfs_set_inode_generation(leaf, item, inode->i_generation);
512 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
b98b6767 513 btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
5f39d397 514 btrfs_set_inode_block_group(leaf, item,
39279cc3
CM		 515 BTRFS_I(inode)->block_group->key.objectid);
516}
517
a52d9a80 518int btrfs_update_inode(struct btrfs_trans_handle *trans,
39279cc3
CM		 519 struct btrfs_root *root,
520 struct inode *inode)
521{
522 struct btrfs_inode_item *inode_item;
523 struct btrfs_path *path;
5f39d397 524 struct extent_buffer *leaf;
39279cc3
CM		 525 int ret;
526
527 path = btrfs_alloc_path();
528 BUG_ON(!path);
39279cc3
CM		 529 ret = btrfs_lookup_inode(trans, root, path,
530 &BTRFS_I(inode)->location, 1);
531 if (ret) {
532 if (ret > 0)
533 ret = -ENOENT;
534 goto failed;
535 }
536
5f39d397
CM		 537 leaf = path->nodes[0];
538 inode_item = btrfs_item_ptr(leaf, path->slots[0],
39279cc3
CM		 539 struct btrfs_inode_item);
540
5f39d397
CM		 541 fill_inode_item(leaf, inode_item, inode);
542 btrfs_mark_buffer_dirty(leaf);
15ee9bc7 543 btrfs_set_inode_last_trans(trans, inode);
39279cc3
CM		 544 ret = 0;
545failed:
546 btrfs_release_path(root, path);
547 btrfs_free_path(path);
548 return ret;
549}
550
551
552static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
553 struct btrfs_root *root,
554 struct inode *dir,
555 struct dentry *dentry)
556{
557 struct btrfs_path *path;
558 const char *name = dentry->d_name.name;
559 int name_len = dentry->d_name.len;
560 int ret = 0;
5f39d397 561 struct extent_buffer *leaf;
39279cc3 562 struct btrfs_dir_item *di;
5f39d397 563 struct btrfs_key key;
39279cc3
CM		 564
565 path = btrfs_alloc_path();
54aa1f4d
CM		 566 if (!path) {
567 ret = -ENOMEM;
568 goto err;
569 }
570
39279cc3
CM		 571 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
572 name, name_len, -1);
573 if (IS_ERR(di)) {
574 ret = PTR_ERR(di);
575 goto err;
576 }
577 if (!di) {
578 ret = -ENOENT;
579 goto err;
580 }
5f39d397
CM		 581 leaf = path->nodes[0];
582 btrfs_dir_item_key_to_cpu(leaf, di, &key);
39279cc3 583 ret = btrfs_delete_one_dir_name(trans, root, path, di);
54aa1f4d
CM		 584 if (ret)
585 goto err;
39279cc3
CM		 586 btrfs_release_path(root, path);
587
588 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
5f39d397 589 key.objectid, name, name_len, -1);
39279cc3
CM		 590 if (IS_ERR(di)) {
591 ret = PTR_ERR(di);
592 goto err;
593 }
594 if (!di) {
595 ret = -ENOENT;
596 goto err;
597 }
598 ret = btrfs_delete_one_dir_name(trans, root, path, di);
39279cc3
CM		 599
600 dentry->d_inode->i_ctime = dir->i_ctime;
76fea00a
CM		 601 ret = btrfs_del_inode_ref(trans, root, name, name_len,
602 dentry->d_inode->i_ino,
603 dentry->d_parent->d_inode->i_ino);
604 if (ret) {
605 printk("failed to delete reference to %.*s, "
606 "inode %lu parent %lu\n", name_len, name,
607 dentry->d_inode->i_ino,
608 dentry->d_parent->d_inode->i_ino);
3954401f 609 }
39279cc3
CM		 610err:
611 btrfs_free_path(path);
612 if (!ret) {
613 dir->i_size -= name_len * 2;
79c44584 614 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
39279cc3 615 btrfs_update_inode(trans, root, dir);
6da6abae
CM		 616#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
617 dentry->d_inode->i_nlink--;
618#else
39279cc3 619 drop_nlink(dentry->d_inode);
6da6abae 620#endif
54aa1f4d 621 ret = btrfs_update_inode(trans, root, dentry->d_inode);
39279cc3
CM		 622 dir->i_sb->s_dirt = 1;
623 }
624 return ret;
625}
626
627static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
628{
629 struct btrfs_root *root;
630 struct btrfs_trans_handle *trans;
2da98f00 631 struct inode *inode = dentry->d_inode;
39279cc3 632 int ret;
1832a6d5 633 unsigned long nr = 0;
39279cc3
CM		 634
635 root = BTRFS_I(dir)->root;
636 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 637
638 ret = btrfs_check_free_space(root, 1, 1);
639 if (ret)
640 goto fail;
641
39279cc3 642 trans = btrfs_start_transaction(root, 1);
5f39d397 643
39279cc3
CM		 644 btrfs_set_trans_block_group(trans, dir);
645 ret = btrfs_unlink_trans(trans, root, dir, dentry);
d3c2fdcf 646 nr = trans->blocks_used;
5f39d397 647
2da98f00
CM		 648 if (inode->i_nlink == 0) {
649 int found;
650 /* if the inode isn't linked anywhere,
651 * we don't need to worry about
652 * data=ordered
653 */
654 found = btrfs_del_ordered_inode(inode);
655 if (found == 1) {
656 atomic_dec(&inode->i_count);
657 }
658 }
659
39279cc3 660 btrfs_end_transaction(trans, root);
1832a6d5 661fail:
39279cc3 662 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 663 btrfs_btree_balance_dirty(root, nr);
e2008b61 664 btrfs_throttle(root);
39279cc3
CM		 665 return ret;
666}
667
668static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
669{
670 struct inode *inode = dentry->d_inode;
1832a6d5 671 int err = 0;
39279cc3
CM		 672 int ret;
673 struct btrfs_root *root = BTRFS_I(dir)->root;
39279cc3 674 struct btrfs_trans_handle *trans;
1832a6d5 675 unsigned long nr = 0;
39279cc3 676
134d4512
Y		 677 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
678 return -ENOTEMPTY;
679
39279cc3 680 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 681 ret = btrfs_check_free_space(root, 1, 1);
682 if (ret)
683 goto fail;
684
39279cc3
CM		 685 trans = btrfs_start_transaction(root, 1);
686 btrfs_set_trans_block_group(trans, dir);
39279cc3
CM		 687
688 /* now the directory is empty */
689 err = btrfs_unlink_trans(trans, root, dir, dentry);
690 if (!err) {
691 inode->i_size = 0;
692 }
3954401f 693
d3c2fdcf 694 nr = trans->blocks_used;
39279cc3 695 ret = btrfs_end_transaction(trans, root);
1832a6d5 696fail:
134d4512 697 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 698 btrfs_btree_balance_dirty(root, nr);
e2008b61 699 btrfs_throttle(root);
3954401f 700
39279cc3
CM		 701 if (ret && !err)
702 err = ret;
703 return err;
704}
705
39279cc3
CM		 706/*
707 * this can truncate away extent items, csum items and directory items.
708 * It starts at a high offset and removes keys until it can't find
709 * any higher than i_size.
710 *
711 * csum items that cross the new i_size are truncated to the new size
712 * as well.
713 */
714static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
715 struct btrfs_root *root,
85e21bac
CM		 716 struct inode *inode,
717 u32 min_type)
39279cc3
CM		 718{
719 int ret;
720 struct btrfs_path *path;
721 struct btrfs_key key;
5f39d397 722 struct btrfs_key found_key;
39279cc3 723 u32 found_type;
5f39d397 724 struct extent_buffer *leaf;
39279cc3
CM		 725 struct btrfs_file_extent_item *fi;
726 u64 extent_start = 0;
db94535d 727 u64 extent_num_bytes = 0;
39279cc3 728 u64 item_end = 0;
7bb86316 729 u64 root_gen = 0;
d8d5f3e1 730 u64 root_owner = 0;
39279cc3
CM		 731 int found_extent;
732 int del_item;
85e21bac
CM		 733 int pending_del_nr = 0;
734 int pending_del_slot = 0;
179e29e4 735 int extent_type = -1;
39279cc3 736
a52d9a80 737 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
39279cc3 738 path = btrfs_alloc_path();
3c69faec 739 path->reada = -1;
39279cc3 740 BUG_ON(!path);
5f39d397 741
39279cc3
CM		 742 /* FIXME, add redo link to tree so we don't leak on crash */
743 key.objectid = inode->i_ino;
744 key.offset = (u64)-1;
5f39d397
CM		 745 key.type = (u8)-1;
746
85e21bac
CM		 747 btrfs_init_path(path);
748search_again:
749 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
750 if (ret < 0) {
751 goto error;
752 }
753 if (ret > 0) {
754 BUG_ON(path->slots[0] == 0);
755 path->slots[0]--;
756 }
757
39279cc3 758 while(1) {
39279cc3 759 fi = NULL;
5f39d397
CM		 760 leaf = path->nodes[0];
761 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
762 found_type = btrfs_key_type(&found_key);
39279cc3 763
5f39d397 764 if (found_key.objectid != inode->i_ino)
39279cc3 765 break;
5f39d397 766
85e21bac 767 if (found_type < min_type)
39279cc3
CM		 768 break;
769
5f39d397 770 item_end = found_key.offset;
39279cc3 771 if (found_type == BTRFS_EXTENT_DATA_KEY) {
5f39d397 772 fi = btrfs_item_ptr(leaf, path->slots[0],
39279cc3 773 struct btrfs_file_extent_item);
179e29e4
CM		 774 extent_type = btrfs_file_extent_type(leaf, fi);
775 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
5f39d397 776 item_end +=
db94535d 777 btrfs_file_extent_num_bytes(leaf, fi);
179e29e4
CM		 778 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
779 struct btrfs_item *item = btrfs_item_nr(leaf,
780 path->slots[0]);
781 item_end += btrfs_file_extent_inline_len(leaf,
782 item);
39279cc3 783 }
008630c1 784 item_end--;
39279cc3
CM		 785 }
786 if (found_type == BTRFS_CSUM_ITEM_KEY) {
787 ret = btrfs_csum_truncate(trans, root, path,
788 inode->i_size);
789 BUG_ON(ret);
790 }
008630c1 791 if (item_end < inode->i_size) {
b888db2b
CM		 792 if (found_type == BTRFS_DIR_ITEM_KEY) {
793 found_type = BTRFS_INODE_ITEM_KEY;
794 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
795 found_type = BTRFS_CSUM_ITEM_KEY;
85e21bac
CM		 796 } else if (found_type == BTRFS_EXTENT_DATA_KEY) {
797 found_type = BTRFS_XATTR_ITEM_KEY;
798 } else if (found_type == BTRFS_XATTR_ITEM_KEY) {
799 found_type = BTRFS_INODE_REF_KEY;
b888db2b
CM		 800 } else if (found_type) {
801 found_type--;
802 } else {
803 break;
39279cc3 804 }
a61721d5 805 btrfs_set_key_type(&key, found_type);
85e21bac 806 goto next;
39279cc3 807 }
5f39d397 808 if (found_key.offset >= inode->i_size)
39279cc3
CM		 809 del_item = 1;
810 else
811 del_item = 0;
812 found_extent = 0;
813
814 /* FIXME, shrink the extent if the ref count is only 1 */
179e29e4
CM		 815 if (found_type != BTRFS_EXTENT_DATA_KEY)
816 goto delete;
817
818 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
39279cc3 819 u64 num_dec;
db94535d 820 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
39279cc3 821 if (!del_item) {
db94535d
CM		 822 u64 orig_num_bytes =
823 btrfs_file_extent_num_bytes(leaf, fi);
824 extent_num_bytes = inode->i_size -
5f39d397 825 found_key.offset + root->sectorsize - 1;
b1632b10
Y		 826 extent_num_bytes = extent_num_bytes &
827 ~((u64)root->sectorsize - 1);
db94535d
CM		 828 btrfs_set_file_extent_num_bytes(leaf, fi,
829 extent_num_bytes);
830 num_dec = (orig_num_bytes -
831 extent_num_bytes) >> 9;
bab9fb03
Y		 832 if (extent_start != 0) {
833 inode->i_blocks -= num_dec;
834 }
5f39d397 835 btrfs_mark_buffer_dirty(leaf);
39279cc3 836 } else {
db94535d
CM		 837 extent_num_bytes =
838 btrfs_file_extent_disk_num_bytes(leaf,
839 fi);
39279cc3 840 /* FIXME blocksize != 4096 */
db94535d
CM		 841 num_dec = btrfs_file_extent_num_bytes(leaf,
842 fi) >> 9;
39279cc3
CM		 843 if (extent_start != 0) {
844 found_extent = 1;
845 inode->i_blocks -= num_dec;
846 }
d8d5f3e1
CM		 847 root_gen = btrfs_header_generation(leaf);
848 root_owner = btrfs_header_owner(leaf);
39279cc3 849 }
179e29e4
CM		 850 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE &&
851 !del_item) {
852 u32 newsize = inode->i_size - found_key.offset;
853 newsize = btrfs_file_extent_calc_inline_size(newsize);
854 ret = btrfs_truncate_item(trans, root, path,
855 newsize, 1);
856 BUG_ON(ret);
39279cc3 857 }
179e29e4 858delete:
39279cc3 859 if (del_item) {
85e21bac
CM		 860 if (!pending_del_nr) {
861 /* no pending yet, add ourselves */
862 pending_del_slot = path->slots[0];
863 pending_del_nr = 1;
864 } else if (pending_del_nr &&
865 path->slots[0] + 1 == pending_del_slot) {
866 /* hop on the pending chunk */
867 pending_del_nr++;
868 pending_del_slot = path->slots[0];
869 } else {
870 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot);
871 }
39279cc3
CM		 872 } else {
873 break;
874 }
39279cc3
CM		 875 if (found_extent) {
876 ret = btrfs_free_extent(trans, root, extent_start,
7bb86316 877 extent_num_bytes,
d8d5f3e1 878 root_owner,
7bb86316
CM		 879 root_gen, inode->i_ino,
880 found_key.offset, 0);
39279cc3
CM		 881 BUG_ON(ret);
882 }
85e21bac
CM		 883next:
884 if (path->slots[0] == 0) {
885 if (pending_del_nr)
886 goto del_pending;
887 btrfs_release_path(root, path);
888 goto search_again;
889 }
890
891 path->slots[0]--;
892 if (pending_del_nr &&
893 path->slots[0] + 1 != pending_del_slot) {
894 struct btrfs_key debug;
895del_pending:
896 btrfs_item_key_to_cpu(path->nodes[0], &debug,
897 pending_del_slot);
898 ret = btrfs_del_items(trans, root, path,
899 pending_del_slot,
900 pending_del_nr);
901 BUG_ON(ret);
902 pending_del_nr = 0;
903 btrfs_release_path(root, path);
904 goto search_again;
905 }
39279cc3
CM		 906 }
907 ret = 0;
908error:
85e21bac
CM		 909 if (pending_del_nr) {
910 ret = btrfs_del_items(trans, root, path, pending_del_slot,
911 pending_del_nr);
912 }
39279cc3
CM		 913 btrfs_release_path(root, path);
914 btrfs_free_path(path);
915 inode->i_sb->s_dirt = 1;
916 return ret;
917}
918
b888db2b 919static int btrfs_cow_one_page(struct inode *inode, struct page *page,
a52d9a80
CM		 920 size_t zero_start)
921{
922 char *kaddr;
d1310b2e 923 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
35ebb934 924 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
b888db2b 925 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
1832a6d5 926 int ret = 0;
a52d9a80 927
190662b2 928 WARN_ON(!PageLocked(page));
b3cfa35a 929 set_page_extent_mapped(page);
a52d9a80 930
d1310b2e 931 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
d1310b2e 932 set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start,
b888db2b 933 page_end, GFP_NOFS);
1832a6d5 934
a52d9a80 935 if (zero_start != PAGE_CACHE_SIZE) {
b888db2b 936 kaddr = kmap(page);
a52d9a80
CM		 937 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
938 flush_dcache_page(page);
b888db2b 939 kunmap(page);
a52d9a80 940 }
b888db2b 941 set_page_dirty(page);
d1310b2e 942 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
a52d9a80 943
a52d9a80
CM		 944 return ret;
945}
946
39279cc3
CM		 947/*
948 * taken from block_truncate_page, but does cow as it zeros out
949 * any bytes left in the last page in the file.
950 */
951static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
952{
953 struct inode *inode = mapping->host;
db94535d
CM		 954 struct btrfs_root *root = BTRFS_I(inode)->root;
955 u32 blocksize = root->sectorsize;
39279cc3
CM		 956 pgoff_t index = from >> PAGE_CACHE_SHIFT;
957 unsigned offset = from & (PAGE_CACHE_SIZE-1);
958 struct page *page;
39279cc3 959 int ret = 0;
a52d9a80 960 u64 page_start;
39279cc3
CM		 961
962 if ((offset & (blocksize - 1)) == 0)
963 goto out;
964
965 ret = -ENOMEM;
966 page = grab_cache_page(mapping, index);
967 if (!page)
968 goto out;
39279cc3 969 if (!PageUptodate(page)) {
9ebefb18 970 ret = btrfs_readpage(NULL, page);
39279cc3
CM		 971 lock_page(page);
972 if (!PageUptodate(page)) {
973 ret = -EIO;
974 goto out;
975 }
976 }
35ebb934 977 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 978
b888db2b 979 ret = btrfs_cow_one_page(inode, page, offset);
39279cc3 980
39279cc3
CM		 981 unlock_page(page);
982 page_cache_release(page);
983out:
984 return ret;
985}
986
987static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
988{
989 struct inode *inode = dentry->d_inode;
990 int err;
991
992 err = inode_change_ok(inode, attr);
993 if (err)
994 return err;
995
996 if (S_ISREG(inode->i_mode) &&
997 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
998 struct btrfs_trans_handle *trans;
999 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 1000 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2bf5a725 1001
5f39d397 1002 u64 mask = root->sectorsize - 1;
39279cc3 1003 u64 pos = (inode->i_size + mask) & ~mask;
2bf5a725 1004 u64 block_end = attr->ia_size | mask;
5f56406a 1005 u64 hole_start;
39279cc3 1006 u64 hole_size;
179e29e4 1007 u64 alloc_hint = 0;
39279cc3
CM		 1008
1009 if (attr->ia_size <= pos)
1010 goto out;
1011
5f56406a
CM		 1012 if (pos != inode->i_size)
1013 hole_start = pos + root->sectorsize;
1014 else
1015 hole_start = pos;
1016
1832a6d5
CM		 1017 mutex_lock(&root->fs_info->fs_mutex);
1018 err = btrfs_check_free_space(root, 1, 0);
1019 mutex_unlock(&root->fs_info->fs_mutex);
1020 if (err)
1021 goto fail;
1022
39279cc3
CM		 1023 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1024
d1310b2e 1025 lock_extent(io_tree, pos, block_end, GFP_NOFS);
5f56406a 1026 hole_size = block_end - hole_start;
39279cc3
CM		 1027
1028 mutex_lock(&root->fs_info->fs_mutex);
1029 trans = btrfs_start_transaction(root, 1);
1030 btrfs_set_trans_block_group(trans, inode);
2bf5a725 1031 err = btrfs_drop_extents(trans, root, inode,
5f56406a 1032 pos, block_end, pos,
3326d1b0 1033 &alloc_hint);
2bf5a725 1034
179e29e4
CM		 1035 if (alloc_hint != EXTENT_MAP_INLINE) {
1036 err = btrfs_insert_file_extent(trans, root,
1037 inode->i_ino,
5f56406a
CM		 1038 hole_start, 0, 0,
1039 hole_size);
d1310b2e
CM		 1040 btrfs_drop_extent_cache(inode, hole_start,
1041 hole_size - 1);
5f56406a 1042 btrfs_check_file(root, inode);
179e29e4 1043 }
39279cc3
CM		 1044 btrfs_end_transaction(trans, root);
1045 mutex_unlock(&root->fs_info->fs_mutex);
d1310b2e 1046 unlock_extent(io_tree, pos, block_end, GFP_NOFS);
54aa1f4d
CM		 1047 if (err)
1048 return err;
39279cc3
CM		 1049 }
1050out:
1051 err = inode_setattr(inode, attr);
1832a6d5 1052fail:
39279cc3
CM		 1053 return err;
1054}
61295eb8 1055
2da98f00 1056void btrfs_put_inode(struct inode *inode)
61295eb8 1057{
2da98f00
CM		 1058 int ret;
1059
1060 if (!BTRFS_I(inode)->ordered_trans) {
61295eb8
CM		 1061 return;
1062 }
2da98f00
CM		 1063
1064 if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
1065 mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))
1066 return;
1067
1068 ret = btrfs_del_ordered_inode(inode);
1069 if (ret == 1) {
1070 atomic_dec(&inode->i_count);
1071 }
61295eb8
CM		 1072}
1073
39279cc3
CM		 1074void btrfs_delete_inode(struct inode *inode)
1075{
1076 struct btrfs_trans_handle *trans;
1077 struct btrfs_root *root = BTRFS_I(inode)->root;
d3c2fdcf 1078 unsigned long nr;
39279cc3
CM		 1079 int ret;
1080
1081 truncate_inode_pages(&inode->i_data, 0);
1082 if (is_bad_inode(inode)) {
1083 goto no_delete;
1084 }
5f39d397 1085
39279cc3
CM		 1086 inode->i_size = 0;
1087 mutex_lock(&root->fs_info->fs_mutex);
1088 trans = btrfs_start_transaction(root, 1);
5f39d397 1089
39279cc3 1090 btrfs_set_trans_block_group(trans, inode);
85e21bac 1091 ret = btrfs_truncate_in_trans(trans, root, inode, 0);
54aa1f4d
CM		 1092 if (ret)
1093 goto no_delete_lock;
85e21bac 1094
d3c2fdcf 1095 nr = trans->blocks_used;
85e21bac 1096 clear_inode(inode);
5f39d397 1097
39279cc3
CM		 1098 btrfs_end_transaction(trans, root);
1099 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1100 btrfs_btree_balance_dirty(root, nr);
e2008b61 1101 btrfs_throttle(root);
39279cc3 1102 return;
54aa1f4d
CM		 1103
1104no_delete_lock:
d3c2fdcf 1105 nr = trans->blocks_used;
54aa1f4d
CM		 1106 btrfs_end_transaction(trans, root);
1107 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1108 btrfs_btree_balance_dirty(root, nr);
e2008b61 1109 btrfs_throttle(root);
39279cc3
CM		 1110no_delete:
1111 clear_inode(inode);
1112}
1113
1114/*
1115 * this returns the key found in the dir entry in the location pointer.
1116 * If no dir entries were found, location->objectid is 0.
1117 */
1118static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1119 struct btrfs_key *location)
1120{
1121 const char *name = dentry->d_name.name;
1122 int namelen = dentry->d_name.len;
1123 struct btrfs_dir_item *di;
1124 struct btrfs_path *path;
1125 struct btrfs_root *root = BTRFS_I(dir)->root;
0d9f7f3e 1126 int ret = 0;
39279cc3 1127
3954401f
CM		 1128 if (namelen == 1 && strcmp(name, ".") == 0) {
1129 location->objectid = dir->i_ino;
1130 location->type = BTRFS_INODE_ITEM_KEY;
1131 location->offset = 0;
1132 return 0;
1133 }
39279cc3
CM		 1134 path = btrfs_alloc_path();
1135 BUG_ON(!path);
3954401f 1136
7a720536 1137 if (namelen == 2 && strcmp(name, "..") == 0) {
3954401f
CM		 1138 struct btrfs_key key;
1139 struct extent_buffer *leaf;
1140 u32 nritems;
1141 int slot;
1142
1143 key.objectid = dir->i_ino;
1144 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1145 key.offset = 0;
1146 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1147 BUG_ON(ret == 0);
1148 ret = 0;
1149
1150 leaf = path->nodes[0];
1151 slot = path->slots[0];
1152 nritems = btrfs_header_nritems(leaf);
1153 if (slot >= nritems)
1154 goto out_err;
1155
1156 btrfs_item_key_to_cpu(leaf, &key, slot);
1157 if (key.objectid != dir->i_ino ||
1158 key.type != BTRFS_INODE_REF_KEY) {
1159 goto out_err;
1160 }
1161 location->objectid = key.offset;
1162 location->type = BTRFS_INODE_ITEM_KEY;
1163 location->offset = 0;
1164 goto out;
1165 }
1166
39279cc3
CM		 1167 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1168 namelen, 0);
0d9f7f3e
Y		 1169 if (IS_ERR(di))
1170 ret = PTR_ERR(di);
39279cc3 1171 if (!di || IS_ERR(di)) {
3954401f 1172 goto out_err;
39279cc3 1173 }
5f39d397 1174 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
39279cc3 1175out:
39279cc3
CM		 1176 btrfs_free_path(path);
1177 return ret;
3954401f
CM		 1178out_err:
1179 location->objectid = 0;
1180 goto out;
39279cc3
CM		 1181}
1182
1183/*
1184 * when we hit a tree root in a directory, the btrfs part of the inode
1185 * needs to be changed to reflect the root directory of the tree root. This
1186 * is kind of like crossing a mount point.
1187 */
1188static int fixup_tree_root_location(struct btrfs_root *root,
1189 struct btrfs_key *location,
58176a96
JB		 1190 struct btrfs_root **sub_root,
1191 struct dentry *dentry)
39279cc3
CM		 1192{
1193 struct btrfs_path *path;
1194 struct btrfs_root_item *ri;
1195
1196 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1197 return 0;
1198 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1199 return 0;
1200
1201 path = btrfs_alloc_path();
1202 BUG_ON(!path);
1203 mutex_lock(&root->fs_info->fs_mutex);
1204
58176a96
JB		 1205 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1206 dentry->d_name.name,
1207 dentry->d_name.len);
39279cc3
CM		 1208 if (IS_ERR(*sub_root))
1209 return PTR_ERR(*sub_root);
1210
1211 ri = &(*sub_root)->root_item;
1212 location->objectid = btrfs_root_dirid(ri);
39279cc3
CM		 1213 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1214 location->offset = 0;
1215
1216 btrfs_free_path(path);
1217 mutex_unlock(&root->fs_info->fs_mutex);
1218 return 0;
1219}
1220
1221static int btrfs_init_locked_inode(struct inode *inode, void *p)
1222{
1223 struct btrfs_iget_args *args = p;
1224 inode->i_ino = args->ino;
1225 BTRFS_I(inode)->root = args->root;
d1310b2e
CM		 1226 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1227 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
b888db2b 1228 inode->i_mapping, GFP_NOFS);
39279cc3
CM		 1229 return 0;
1230}
1231
1232static int btrfs_find_actor(struct inode *inode, void *opaque)
1233{
1234 struct btrfs_iget_args *args = opaque;
1235 return (args->ino == inode->i_ino &&
1236 args->root == BTRFS_I(inode)->root);
1237}
1238
dc17ff8f
CM		 1239struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1240 u64 root_objectid)
1241{
1242 struct btrfs_iget_args args;
1243 args.ino = objectid;
1244 args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);
1245
1246 if (!args.root)
1247 return NULL;
1248
1249 return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
1250}
1251
39279cc3
CM		 1252struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1253 struct btrfs_root *root)
1254{
1255 struct inode *inode;
1256 struct btrfs_iget_args args;
1257 args.ino = objectid;
1258 args.root = root;
1259
1260 inode = iget5_locked(s, objectid, btrfs_find_actor,
1261 btrfs_init_locked_inode,
1262 (void *)&args);
1263 return inode;
1264}
1265
1266static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1267 struct nameidata *nd)
1268{
1269 struct inode * inode;
1270 struct btrfs_inode *bi = BTRFS_I(dir);
1271 struct btrfs_root *root = bi->root;
1272 struct btrfs_root *sub_root = root;
1273 struct btrfs_key location;
1274 int ret;
1275
1276 if (dentry->d_name.len > BTRFS_NAME_LEN)
1277 return ERR_PTR(-ENAMETOOLONG);
5f39d397 1278
39279cc3
CM		 1279 mutex_lock(&root->fs_info->fs_mutex);
1280 ret = btrfs_inode_by_name(dir, dentry, &location);
1281 mutex_unlock(&root->fs_info->fs_mutex);
5f39d397 1282
39279cc3
CM		 1283 if (ret < 0)
1284 return ERR_PTR(ret);
5f39d397 1285
39279cc3
CM		 1286 inode = NULL;
1287 if (location.objectid) {
58176a96
JB		 1288 ret = fixup_tree_root_location(root, &location, &sub_root,
1289 dentry);
39279cc3
CM		 1290 if (ret < 0)
1291 return ERR_PTR(ret);
1292 if (ret > 0)
1293 return ERR_PTR(-ENOENT);
1294 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1295 sub_root);
1296 if (!inode)
1297 return ERR_PTR(-EACCES);
1298 if (inode->i_state & I_NEW) {
1299 /* the inode and parent dir are two different roots */
1300 if (sub_root != root) {
1301 igrab(inode);
1302 sub_root->inode = inode;
1303 }
1304 BTRFS_I(inode)->root = sub_root;
1305 memcpy(&BTRFS_I(inode)->location, &location,
1306 sizeof(location));
1307 btrfs_read_locked_inode(inode);
1308 unlock_new_inode(inode);
1309 }
1310 }
1311 return d_splice_alias(inode, dentry);
1312}
1313
39279cc3
CM		 1314static unsigned char btrfs_filetype_table[] = {
1315 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1316};
1317
1318static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1319{
6da6abae 1320 struct inode *inode = filp->f_dentry->d_inode;
39279cc3
CM		 1321 struct btrfs_root *root = BTRFS_I(inode)->root;
1322 struct btrfs_item *item;
1323 struct btrfs_dir_item *di;
1324 struct btrfs_key key;
5f39d397 1325 struct btrfs_key found_key;
39279cc3
CM		 1326 struct btrfs_path *path;
1327 int ret;
1328 u32 nritems;
5f39d397 1329 struct extent_buffer *leaf;
39279cc3
CM		 1330 int slot;
1331 int advance;
1332 unsigned char d_type;
1333 int over = 0;
1334 u32 di_cur;
1335 u32 di_total;
1336 u32 di_len;
1337 int key_type = BTRFS_DIR_INDEX_KEY;
5f39d397
CM		 1338 char tmp_name[32];
1339 char *name_ptr;
1340 int name_len;
39279cc3
CM		 1341
1342 /* FIXME, use a real flag for deciding about the key type */
1343 if (root->fs_info->tree_root == root)
1344 key_type = BTRFS_DIR_ITEM_KEY;
5f39d397 1345
3954401f
CM		 1346 /* special case for "." */
1347 if (filp->f_pos == 0) {
1348 over = filldir(dirent, ".", 1,
1349 1, inode->i_ino,
1350 DT_DIR);
1351 if (over)
1352 return 0;
1353 filp->f_pos = 1;
1354 }
1355
39279cc3
CM		 1356 mutex_lock(&root->fs_info->fs_mutex);
1357 key.objectid = inode->i_ino;
3954401f
CM		 1358 path = btrfs_alloc_path();
1359 path->reada = 2;
1360
1361 /* special case for .., just use the back ref */
1362 if (filp->f_pos == 1) {
1363 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1364 key.offset = 0;
1365 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1366 BUG_ON(ret == 0);
1367 leaf = path->nodes[0];
1368 slot = path->slots[0];
1369 nritems = btrfs_header_nritems(leaf);
1370 if (slot >= nritems) {
1371 btrfs_release_path(root, path);
1372 goto read_dir_items;
1373 }
1374 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1375 btrfs_release_path(root, path);
1376 if (found_key.objectid != key.objectid ||
1377 found_key.type != BTRFS_INODE_REF_KEY)
1378 goto read_dir_items;
1379 over = filldir(dirent, "..", 2,
1380 2, found_key.offset, DT_DIR);
1381 if (over)
1382 goto nopos;
1383 filp->f_pos = 2;
1384 }
1385
1386read_dir_items:
39279cc3
CM		 1387 btrfs_set_key_type(&key, key_type);
1388 key.offset = filp->f_pos;
5f39d397 1389
39279cc3
CM		 1390 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1391 if (ret < 0)
1392 goto err;
1393 advance = 0;
39279cc3 1394 while(1) {
5f39d397
CM		 1395 leaf = path->nodes[0];
1396 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1397 slot = path->slots[0];
1398 if (advance || slot >= nritems) {
1399 if (slot >= nritems -1) {
39279cc3
CM		 1400 ret = btrfs_next_leaf(root, path);
1401 if (ret)
1402 break;
5f39d397
CM		 1403 leaf = path->nodes[0];
1404 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1405 slot = path->slots[0];
1406 } else {
1407 slot++;
1408 path->slots[0]++;
1409 }
1410 }
1411 advance = 1;
5f39d397
CM		 1412 item = btrfs_item_nr(leaf, slot);
1413 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1414
1415 if (found_key.objectid != key.objectid)
39279cc3 1416 break;
5f39d397 1417 if (btrfs_key_type(&found_key) != key_type)
39279cc3 1418 break;
5f39d397 1419 if (found_key.offset < filp->f_pos)
39279cc3 1420 continue;
5f39d397
CM		 1421
1422 filp->f_pos = found_key.offset;
39279cc3
CM		 1423 advance = 1;
1424 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1425 di_cur = 0;
5f39d397 1426 di_total = btrfs_item_size(leaf, item);
39279cc3 1427 while(di_cur < di_total) {
5f39d397
CM		 1428 struct btrfs_key location;
1429
1430 name_len = btrfs_dir_name_len(leaf, di);
1431 if (name_len < 32) {
1432 name_ptr = tmp_name;
1433 } else {
1434 name_ptr = kmalloc(name_len, GFP_NOFS);
1435 BUG_ON(!name_ptr);
1436 }
1437 read_extent_buffer(leaf, name_ptr,
1438 (unsigned long)(di + 1), name_len);
1439
1440 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1441 btrfs_dir_item_key_to_cpu(leaf, di, &location);
5f39d397
CM		 1442 over = filldir(dirent, name_ptr, name_len,
1443 found_key.offset,
1444 location.objectid,
39279cc3 1445 d_type);
5f39d397
CM		 1446
1447 if (name_ptr != tmp_name)
1448 kfree(name_ptr);
1449
39279cc3
CM		 1450 if (over)
1451 goto nopos;
5103e947
JB		 1452 di_len = btrfs_dir_name_len(leaf, di) +
1453 btrfs_dir_data_len(leaf, di) +sizeof(*di);
39279cc3
CM		 1454 di_cur += di_len;
1455 di = (struct btrfs_dir_item *)((char *)di + di_len);
1456 }
1457 }
c2a8b6e1 1458 filp->f_pos = INT_LIMIT(typeof(filp->f_pos));
39279cc3
CM		 1459nopos:
1460 ret = 0;
1461err:
1462 btrfs_release_path(root, path);
1463 btrfs_free_path(path);
1464 mutex_unlock(&root->fs_info->fs_mutex);
1465 return ret;
1466}
1467
1468int btrfs_write_inode(struct inode *inode, int wait)
1469{
1470 struct btrfs_root *root = BTRFS_I(inode)->root;
1471 struct btrfs_trans_handle *trans;
1472 int ret = 0;
1473
1474 if (wait) {
1475 mutex_lock(&root->fs_info->fs_mutex);
1476 trans = btrfs_start_transaction(root, 1);
1477 btrfs_set_trans_block_group(trans, inode);
1478 ret = btrfs_commit_transaction(trans, root);
1479 mutex_unlock(&root->fs_info->fs_mutex);
1480 }
1481 return ret;
1482}
1483
1484/*
54aa1f4d 1485 * This is somewhat expensive, updating the tree every time the
39279cc3
CM		 1486 * inode changes. But, it is most likely to find the inode in cache.
1487 * FIXME, needs more benchmarking...there are no reasons other than performance
1488 * to keep or drop this code.
1489 */
1490void btrfs_dirty_inode(struct inode *inode)
1491{
1492 struct btrfs_root *root = BTRFS_I(inode)->root;
1493 struct btrfs_trans_handle *trans;
1494
1495 mutex_lock(&root->fs_info->fs_mutex);
1496 trans = btrfs_start_transaction(root, 1);
1497 btrfs_set_trans_block_group(trans, inode);
1498 btrfs_update_inode(trans, root, inode);
1499 btrfs_end_transaction(trans, root);
1500 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 1501}
1502
1503static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1504 struct btrfs_root *root,
9c58309d
CM		 1505 const char *name, int name_len,
1506 u64 ref_objectid,
39279cc3
CM		 1507 u64 objectid,
1508 struct btrfs_block_group_cache *group,
1509 int mode)
1510{
1511 struct inode *inode;
5f39d397 1512 struct btrfs_inode_item *inode_item;
39279cc3 1513 struct btrfs_key *location;
5f39d397 1514 struct btrfs_path *path;
9c58309d
CM		 1515 struct btrfs_inode_ref *ref;
1516 struct btrfs_key key[2];
1517 u32 sizes[2];
1518 unsigned long ptr;
39279cc3
CM		 1519 int ret;
1520 int owner;
1521
5f39d397
CM		 1522 path = btrfs_alloc_path();
1523 BUG_ON(!path);
1524
39279cc3
CM		 1525 inode = new_inode(root->fs_info->sb);
1526 if (!inode)
1527 return ERR_PTR(-ENOMEM);
1528
d1310b2e
CM		 1529 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1530 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
b888db2b 1531 inode->i_mapping, GFP_NOFS);
39279cc3 1532 BTRFS_I(inode)->root = root;
b888db2b 1533
39279cc3
CM		 1534 if (mode & S_IFDIR)
1535 owner = 0;
1536 else
1537 owner = 1;
1538 group = btrfs_find_block_group(root, group, 0, 0, owner);
1539 BTRFS_I(inode)->block_group = group;
b98b6767 1540 BTRFS_I(inode)->flags = 0;
9c58309d
CM		 1541
1542 key[0].objectid = objectid;
1543 btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY);
1544 key[0].offset = 0;
1545
1546 key[1].objectid = objectid;
1547 btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY);
1548 key[1].offset = ref_objectid;
1549
1550 sizes[0] = sizeof(struct btrfs_inode_item);
1551 sizes[1] = name_len + sizeof(*ref);
1552
1553 ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2);
1554 if (ret != 0)
5f39d397
CM		 1555 goto fail;
1556
9c58309d
CM		 1557 if (objectid > root->highest_inode)
1558 root->highest_inode = objectid;
1559
39279cc3
CM		 1560 inode->i_uid = current->fsuid;
1561 inode->i_gid = current->fsgid;
1562 inode->i_mode = mode;
1563 inode->i_ino = objectid;
1564 inode->i_blocks = 0;
1565 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
5f39d397
CM		 1566 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1567 struct btrfs_inode_item);
1568 fill_inode_item(path->nodes[0], inode_item, inode);
9c58309d
CM		 1569
1570 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
1571 struct btrfs_inode_ref);
1572 btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
1573 ptr = (unsigned long)(ref + 1);
1574 write_extent_buffer(path->nodes[0], name, ptr, name_len);
1575
5f39d397
CM		 1576 btrfs_mark_buffer_dirty(path->nodes[0]);
1577 btrfs_free_path(path);
1578
39279cc3
CM		 1579 location = &BTRFS_I(inode)->location;
1580 location->objectid = objectid;
39279cc3
CM		 1581 location->offset = 0;
1582 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1583
39279cc3
CM		 1584 insert_inode_hash(inode);
1585 return inode;
5f39d397
CM		 1586fail:
1587 btrfs_free_path(path);
1588 return ERR_PTR(ret);
39279cc3
CM		 1589}
1590
1591static inline u8 btrfs_inode_type(struct inode *inode)
1592{
1593 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1594}
1595
1596static int btrfs_add_link(struct btrfs_trans_handle *trans,
9c58309d
CM		 1597 struct dentry *dentry, struct inode *inode,
1598 int add_backref)
39279cc3
CM		 1599{
1600 int ret;
1601 struct btrfs_key key;
1602 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
79c44584 1603 struct inode *parent_inode;
5f39d397 1604
39279cc3 1605 key.objectid = inode->i_ino;
39279cc3
CM		 1606 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1607 key.offset = 0;
1608
1609 ret = btrfs_insert_dir_item(trans, root,
1610 dentry->d_name.name, dentry->d_name.len,
1611 dentry->d_parent->d_inode->i_ino,
1612 &key, btrfs_inode_type(inode));
1613 if (ret == 0) {
9c58309d
CM		 1614 if (add_backref) {
1615 ret = btrfs_insert_inode_ref(trans, root,
1616 dentry->d_name.name,
1617 dentry->d_name.len,
1618 inode->i_ino,
1619 dentry->d_parent->d_inode->i_ino);
1620 }
79c44584
CM		 1621 parent_inode = dentry->d_parent->d_inode;
1622 parent_inode->i_size += dentry->d_name.len * 2;
1623 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
39279cc3
CM		 1624 ret = btrfs_update_inode(trans, root,
1625 dentry->d_parent->d_inode);
1626 }
1627 return ret;
1628}
1629
1630static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
9c58309d
CM		 1631 struct dentry *dentry, struct inode *inode,
1632 int backref)
39279cc3 1633{
9c58309d 1634 int err = btrfs_add_link(trans, dentry, inode, backref);
39279cc3
CM		 1635 if (!err) {
1636 d_instantiate(dentry, inode);
1637 return 0;
1638 }
1639 if (err > 0)
1640 err = -EEXIST;
1641 return err;
1642}
1643
618e21d5
JB		 1644static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1645 int mode, dev_t rdev)
1646{
1647 struct btrfs_trans_handle *trans;
1648 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1649 struct inode *inode = NULL;
618e21d5
JB		 1650 int err;
1651 int drop_inode = 0;
1652 u64 objectid;
1832a6d5 1653 unsigned long nr = 0;
618e21d5
JB		 1654
1655 if (!new_valid_dev(rdev))
1656 return -EINVAL;
1657
1658 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1659 err = btrfs_check_free_space(root, 1, 0);
1660 if (err)
1661 goto fail;
1662
618e21d5
JB		 1663 trans = btrfs_start_transaction(root, 1);
1664 btrfs_set_trans_block_group(trans, dir);
1665
1666 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1667 if (err) {
1668 err = -ENOSPC;
1669 goto out_unlock;
1670 }
1671
9c58309d
CM		 1672 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1673 dentry->d_name.len,
1674 dentry->d_parent->d_inode->i_ino, objectid,
618e21d5
JB		 1675 BTRFS_I(dir)->block_group, mode);
1676 err = PTR_ERR(inode);
1677 if (IS_ERR(inode))
1678 goto out_unlock;
1679
1680 btrfs_set_trans_block_group(trans, inode);
9c58309d 1681 err = btrfs_add_nondir(trans, dentry, inode, 0);
618e21d5
JB		 1682 if (err)
1683 drop_inode = 1;
1684 else {
1685 inode->i_op = &btrfs_special_inode_operations;
1686 init_special_inode(inode, inode->i_mode, rdev);
1b4ab1bb 1687 btrfs_update_inode(trans, root, inode);
618e21d5
JB		 1688 }
1689 dir->i_sb->s_dirt = 1;
1690 btrfs_update_inode_block_group(trans, inode);
1691 btrfs_update_inode_block_group(trans, dir);
1692out_unlock:
d3c2fdcf 1693 nr = trans->blocks_used;
618e21d5 1694 btrfs_end_transaction(trans, root);
1832a6d5 1695fail:
618e21d5
JB		 1696 mutex_unlock(&root->fs_info->fs_mutex);
1697
1698 if (drop_inode) {
1699 inode_dec_link_count(inode);
1700 iput(inode);
1701 }
d3c2fdcf 1702 btrfs_btree_balance_dirty(root, nr);
e2008b61 1703 btrfs_throttle(root);
618e21d5
JB		 1704 return err;
1705}
1706
39279cc3
CM		 1707static int btrfs_create(struct inode *dir, struct dentry *dentry,
1708 int mode, struct nameidata *nd)
1709{
1710 struct btrfs_trans_handle *trans;
1711 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1712 struct inode *inode = NULL;
39279cc3
CM		 1713 int err;
1714 int drop_inode = 0;
1832a6d5 1715 unsigned long nr = 0;
39279cc3
CM		 1716 u64 objectid;
1717
1718 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1719 err = btrfs_check_free_space(root, 1, 0);
1720 if (err)
1721 goto fail;
39279cc3
CM		 1722 trans = btrfs_start_transaction(root, 1);
1723 btrfs_set_trans_block_group(trans, dir);
1724
1725 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1726 if (err) {
1727 err = -ENOSPC;
1728 goto out_unlock;
1729 }
1730
9c58309d
CM		 1731 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1732 dentry->d_name.len,
1733 dentry->d_parent->d_inode->i_ino,
1734 objectid, BTRFS_I(dir)->block_group, mode);
39279cc3
CM		 1735 err = PTR_ERR(inode);
1736 if (IS_ERR(inode))
1737 goto out_unlock;
1738
1739 btrfs_set_trans_block_group(trans, inode);
9c58309d 1740 err = btrfs_add_nondir(trans, dentry, inode, 0);
39279cc3
CM		 1741 if (err)
1742 drop_inode = 1;
1743 else {
1744 inode->i_mapping->a_ops = &btrfs_aops;
1745 inode->i_fop = &btrfs_file_operations;
1746 inode->i_op = &btrfs_file_inode_operations;
d1310b2e
CM		 1747 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1748 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
a52d9a80 1749 inode->i_mapping, GFP_NOFS);
d1310b2e 1750 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 1751 }
1752 dir->i_sb->s_dirt = 1;
1753 btrfs_update_inode_block_group(trans, inode);
1754 btrfs_update_inode_block_group(trans, dir);
1755out_unlock:
d3c2fdcf 1756 nr = trans->blocks_used;
39279cc3 1757 btrfs_end_transaction(trans, root);
1832a6d5 1758fail:
39279cc3
CM		 1759 mutex_unlock(&root->fs_info->fs_mutex);
1760
1761 if (drop_inode) {
1762 inode_dec_link_count(inode);
1763 iput(inode);
1764 }
d3c2fdcf 1765 btrfs_btree_balance_dirty(root, nr);
e2008b61 1766 btrfs_throttle(root);
39279cc3
CM		 1767 return err;
1768}
1769
1770static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1771 struct dentry *dentry)
1772{
1773 struct btrfs_trans_handle *trans;
1774 struct btrfs_root *root = BTRFS_I(dir)->root;
1775 struct inode *inode = old_dentry->d_inode;
1832a6d5 1776 unsigned long nr = 0;
39279cc3
CM		 1777 int err;
1778 int drop_inode = 0;
1779
1780 if (inode->i_nlink == 0)
1781 return -ENOENT;
1782
6da6abae
CM		 1783#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1784 inode->i_nlink++;
1785#else
39279cc3 1786 inc_nlink(inode);
6da6abae 1787#endif
39279cc3 1788 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1789 err = btrfs_check_free_space(root, 1, 0);
1790 if (err)
1791 goto fail;
39279cc3 1792 trans = btrfs_start_transaction(root, 1);
5f39d397 1793
39279cc3
CM		 1794 btrfs_set_trans_block_group(trans, dir);
1795 atomic_inc(&inode->i_count);
9c58309d 1796 err = btrfs_add_nondir(trans, dentry, inode, 1);
5f39d397 1797
39279cc3
CM		 1798 if (err)
1799 drop_inode = 1;
5f39d397 1800
39279cc3
CM		 1801 dir->i_sb->s_dirt = 1;
1802 btrfs_update_inode_block_group(trans, dir);
54aa1f4d 1803 err = btrfs_update_inode(trans, root, inode);
5f39d397 1804
54aa1f4d
CM		 1805 if (err)
1806 drop_inode = 1;
39279cc3 1807
d3c2fdcf 1808 nr = trans->blocks_used;
39279cc3 1809 btrfs_end_transaction(trans, root);
1832a6d5 1810fail:
39279cc3
CM		 1811 mutex_unlock(&root->fs_info->fs_mutex);
1812
1813 if (drop_inode) {
1814 inode_dec_link_count(inode);
1815 iput(inode);
1816 }
d3c2fdcf 1817 btrfs_btree_balance_dirty(root, nr);
e2008b61 1818 btrfs_throttle(root);
39279cc3
CM		 1819 return err;
1820}
1821
39279cc3
CM		 1822static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1823{
1824 struct inode *inode;
1825 struct btrfs_trans_handle *trans;
1826 struct btrfs_root *root = BTRFS_I(dir)->root;
1827 int err = 0;
1828 int drop_on_err = 0;
1829 u64 objectid;
d3c2fdcf 1830 unsigned long nr = 1;
39279cc3
CM		 1831
1832 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1833 err = btrfs_check_free_space(root, 1, 0);
1834 if (err)
1835 goto out_unlock;
1836
39279cc3
CM		 1837 trans = btrfs_start_transaction(root, 1);
1838 btrfs_set_trans_block_group(trans, dir);
5f39d397 1839
39279cc3
CM		 1840 if (IS_ERR(trans)) {
1841 err = PTR_ERR(trans);
1842 goto out_unlock;
1843 }
1844
1845 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1846 if (err) {
1847 err = -ENOSPC;
1848 goto out_unlock;
1849 }
1850
9c58309d
CM		 1851 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1852 dentry->d_name.len,
1853 dentry->d_parent->d_inode->i_ino, objectid,
39279cc3
CM		 1854 BTRFS_I(dir)->block_group, S_IFDIR | mode);
1855 if (IS_ERR(inode)) {
1856 err = PTR_ERR(inode);
1857 goto out_fail;
1858 }
5f39d397 1859
39279cc3
CM		 1860 drop_on_err = 1;
1861 inode->i_op = &btrfs_dir_inode_operations;
1862 inode->i_fop = &btrfs_dir_file_operations;
1863 btrfs_set_trans_block_group(trans, inode);
1864
3954401f 1865 inode->i_size = 0;
39279cc3
CM		 1866 err = btrfs_update_inode(trans, root, inode);
1867 if (err)
1868 goto out_fail;
5f39d397 1869
9c58309d 1870 err = btrfs_add_link(trans, dentry, inode, 0);
39279cc3
CM		 1871 if (err)
1872 goto out_fail;
5f39d397 1873
39279cc3
CM		 1874 d_instantiate(dentry, inode);
1875 drop_on_err = 0;
1876 dir->i_sb->s_dirt = 1;
1877 btrfs_update_inode_block_group(trans, inode);
1878 btrfs_update_inode_block_group(trans, dir);
1879
1880out_fail:
d3c2fdcf 1881 nr = trans->blocks_used;
39279cc3 1882 btrfs_end_transaction(trans, root);
5f39d397 1883
39279cc3
CM		 1884out_unlock:
1885 mutex_unlock(&root->fs_info->fs_mutex);
1886 if (drop_on_err)
1887 iput(inode);
d3c2fdcf 1888 btrfs_btree_balance_dirty(root, nr);
e2008b61 1889 btrfs_throttle(root);
39279cc3
CM		 1890 return err;
1891}
1892
a52d9a80 1893struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
70dec807 1894 size_t pg_offset, u64 start, u64 len,
a52d9a80
CM		 1895 int create)
1896{
1897 int ret;
1898 int err = 0;
db94535d 1899 u64 bytenr;
a52d9a80
CM		 1900 u64 extent_start = 0;
1901 u64 extent_end = 0;
1902 u64 objectid = inode->i_ino;
1903 u32 found_type;
a52d9a80
CM		 1904 struct btrfs_path *path;
1905 struct btrfs_root *root = BTRFS_I(inode)->root;
1906 struct btrfs_file_extent_item *item;
5f39d397
CM		 1907 struct extent_buffer *leaf;
1908 struct btrfs_key found_key;
a52d9a80
CM		 1909 struct extent_map *em = NULL;
1910 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
d1310b2e 1911 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
a52d9a80
CM		 1912 struct btrfs_trans_handle *trans = NULL;
1913
1914 path = btrfs_alloc_path();
1915 BUG_ON(!path);
1916 mutex_lock(&root->fs_info->fs_mutex);
1917
1918again:
d1310b2e
CM		 1919 spin_lock(&em_tree->lock);
1920 em = lookup_extent_mapping(em_tree, start, len);
1921 spin_unlock(&em_tree->lock);
1922
a52d9a80 1923 if (em) {
56b453c9 1924 if (em->start > start) {
d1310b2e
CM		 1925 printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n",
1926 start, len, em->start, em->len);
56b453c9
CM		 1927 WARN_ON(1);
1928 }
70dec807
CM		 1929 if (em->block_start == EXTENT_MAP_INLINE && page)
1930 free_extent_map(em);
1931 else
1932 goto out;
a52d9a80 1933 }
d1310b2e 1934 em = alloc_extent_map(GFP_NOFS);
a52d9a80 1935 if (!em) {
d1310b2e
CM		 1936 err = -ENOMEM;
1937 goto out;
a52d9a80 1938 }
d1310b2e
CM		 1939
1940 em->start = EXTENT_MAP_HOLE;
1941 em->len = (u64)-1;
a52d9a80 1942 em->bdev = inode->i_sb->s_bdev;
179e29e4
CM		 1943 ret = btrfs_lookup_file_extent(trans, root, path,
1944 objectid, start, trans != NULL);
a52d9a80
CM		 1945 if (ret < 0) {
1946 err = ret;
1947 goto out;
1948 }
1949
1950 if (ret != 0) {
1951 if (path->slots[0] == 0)
1952 goto not_found;
1953 path->slots[0]--;
1954 }
1955
5f39d397
CM		 1956 leaf = path->nodes[0];
1957 item = btrfs_item_ptr(leaf, path->slots[0],
a52d9a80 1958 struct btrfs_file_extent_item);
a52d9a80 1959 /* are we inside the extent that was found? */
5f39d397
CM		 1960 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1961 found_type = btrfs_key_type(&found_key);
1962 if (found_key.objectid != objectid ||
a52d9a80
CM		 1963 found_type != BTRFS_EXTENT_DATA_KEY) {
1964 goto not_found;
1965 }
1966
5f39d397
CM		 1967 found_type = btrfs_file_extent_type(leaf, item);
1968 extent_start = found_key.offset;
a52d9a80
CM		 1969 if (found_type == BTRFS_FILE_EXTENT_REG) {
1970 extent_end = extent_start +
db94535d 1971 btrfs_file_extent_num_bytes(leaf, item);
a52d9a80 1972 err = 0;
b888db2b 1973 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 1974 em->start = start;
1975 if (start < extent_start) {
d1310b2e 1976 if (start + len <= extent_start)
b888db2b 1977 goto not_found;
d1310b2e 1978 em->len = extent_end - extent_start;
a52d9a80 1979 } else {
d1310b2e 1980 em->len = len;
a52d9a80
CM		 1981 }
1982 goto not_found_em;
1983 }
db94535d
CM		 1984 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
1985 if (bytenr == 0) {
a52d9a80 1986 em->start = extent_start;
d1310b2e 1987 em->len = extent_end - extent_start;
5f39d397 1988 em->block_start = EXTENT_MAP_HOLE;
a52d9a80
CM		 1989 goto insert;
1990 }
db94535d
CM		 1991 bytenr += btrfs_file_extent_offset(leaf, item);
1992 em->block_start = bytenr;
a52d9a80 1993 em->start = extent_start;
d1310b2e 1994 em->len = extent_end - extent_start;
a52d9a80
CM		 1995 goto insert;
1996 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
70dec807 1997 u64 page_start;
5f39d397 1998 unsigned long ptr;
a52d9a80 1999 char *map;
3326d1b0
CM		 2000 size_t size;
2001 size_t extent_offset;
2002 size_t copy_size;
a52d9a80 2003
5f39d397
CM		 2004 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
2005 path->slots[0]));
d1310b2e
CM		 2006 extent_end = (extent_start + size + root->sectorsize - 1) &
2007 ~((u64)root->sectorsize - 1);
b888db2b 2008 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 2009 em->start = start;
2010 if (start < extent_start) {
d1310b2e 2011 if (start + len <= extent_start)
b888db2b 2012 goto not_found;
d1310b2e 2013 em->len = extent_end - extent_start;
a52d9a80 2014 } else {
d1310b2e 2015 em->len = len;
a52d9a80
CM		 2016 }
2017 goto not_found_em;
2018 }
689f9346 2019 em->block_start = EXTENT_MAP_INLINE;
689f9346
Y		 2020
2021 if (!page) {
2022 em->start = extent_start;
d1310b2e 2023 em->len = size;
689f9346
Y		 2024 goto out;
2025 }
5f39d397 2026
70dec807
CM		 2027 page_start = page_offset(page) + pg_offset;
2028 extent_offset = page_start - extent_start;
2029 copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
3326d1b0 2030 size - extent_offset);
3326d1b0 2031 em->start = extent_start + extent_offset;
70dec807
CM		 2032 em->len = (copy_size + root->sectorsize - 1) &
2033 ~((u64)root->sectorsize - 1);
689f9346
Y		 2034 map = kmap(page);
2035 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
179e29e4 2036 if (create == 0 && !PageUptodate(page)) {
70dec807 2037 read_extent_buffer(leaf, map + pg_offset, ptr,
179e29e4
CM		 2038 copy_size);
2039 flush_dcache_page(page);
2040 } else if (create && PageUptodate(page)) {
2041 if (!trans) {
2042 kunmap(page);
2043 free_extent_map(em);
2044 em = NULL;
2045 btrfs_release_path(root, path);
2046 trans = btrfs_start_transaction(root, 1);
2047 goto again;
2048 }
70dec807 2049 write_extent_buffer(leaf, map + pg_offset, ptr,
179e29e4
CM		 2050 copy_size);
2051 btrfs_mark_buffer_dirty(leaf);
a52d9a80 2052 }
a52d9a80 2053 kunmap(page);
d1310b2e
CM		 2054 set_extent_uptodate(io_tree, em->start,
2055 extent_map_end(em) - 1, GFP_NOFS);
a52d9a80
CM		 2056 goto insert;
2057 } else {
2058 printk("unkknown found_type %d\n", found_type);
2059 WARN_ON(1);
2060 }
2061not_found:
2062 em->start = start;
d1310b2e 2063 em->len = len;
a52d9a80 2064not_found_em:
5f39d397 2065 em->block_start = EXTENT_MAP_HOLE;
a52d9a80
CM		 2066insert:
2067 btrfs_release_path(root, path);
d1310b2e
CM		 2068 if (em->start > start || extent_map_end(em) <= start) {
2069 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len);
a52d9a80
CM		 2070 err = -EIO;
2071 goto out;
2072 }
d1310b2e
CM		 2073
2074 err = 0;
2075 spin_lock(&em_tree->lock);
a52d9a80
CM		 2076 ret = add_extent_mapping(em_tree, em);
2077 if (ret == -EEXIST) {
2078 free_extent_map(em);
d1310b2e
CM		 2079 em = lookup_extent_mapping(em_tree, start, len);
2080 if (!em) {
a52d9a80 2081 err = -EIO;
d1310b2e 2082 printk("failing to insert %Lu %Lu\n", start, len);
a52d9a80 2083 }
a52d9a80 2084 }
d1310b2e 2085 spin_unlock(&em_tree->lock);
a52d9a80
CM		 2086out:
2087 btrfs_free_path(path);
2088 if (trans) {
2089 ret = btrfs_end_transaction(trans, root);
2090 if (!err)
2091 err = ret;
2092 }
2093 mutex_unlock(&root->fs_info->fs_mutex);
2094 if (err) {
2095 free_extent_map(em);
2096 WARN_ON(1);
2097 return ERR_PTR(err);
2098 }
2099 return em;
2100}
2101
d396c6f5 2102static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
39279cc3 2103{
d396c6f5 2104 return extent_bmap(mapping, iblock, btrfs_get_extent);
39279cc3
CM		 2105}
2106
a52d9a80 2107int btrfs_readpage(struct file *file, struct page *page)
9ebefb18 2108{
d1310b2e
CM		 2109 struct extent_io_tree *tree;
2110 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80 2111 return extent_read_full_page(tree, page, btrfs_get_extent);
9ebefb18 2112}
1832a6d5 2113
a52d9a80 2114static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
39279cc3 2115{
d1310b2e 2116 struct extent_io_tree *tree;
b888db2b
CM		 2117
2118
2119 if (current->flags & PF_MEMALLOC) {
2120 redirty_page_for_writepage(wbc, page);
2121 unlock_page(page);
2122 return 0;
2123 }
d1310b2e 2124 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80 2125 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
9ebefb18
CM		 2126}
2127
b293f02e
CM		 2128static int btrfs_writepages(struct address_space *mapping,
2129 struct writeback_control *wbc)
2130{
d1310b2e
CM		 2131 struct extent_io_tree *tree;
2132 tree = &BTRFS_I(mapping->host)->io_tree;
b293f02e
CM		 2133 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2134}
2135
3ab2fb5a
CM		 2136static int
2137btrfs_readpages(struct file *file, struct address_space *mapping,
2138 struct list_head *pages, unsigned nr_pages)
2139{
d1310b2e
CM		 2140 struct extent_io_tree *tree;
2141 tree = &BTRFS_I(mapping->host)->io_tree;
3ab2fb5a
CM		 2142 return extent_readpages(tree, mapping, pages, nr_pages,
2143 btrfs_get_extent);
2144}
2145
70dec807 2146static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
9ebefb18 2147{
d1310b2e
CM		 2148 struct extent_io_tree *tree;
2149 struct extent_map_tree *map;
a52d9a80 2150 int ret;
8c2383c3 2151
d1310b2e
CM		 2152 tree = &BTRFS_I(page->mapping->host)->io_tree;
2153 map = &BTRFS_I(page->mapping->host)->extent_tree;
70dec807 2154 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
a52d9a80
CM		 2155 if (ret == 1) {
2156 ClearPagePrivate(page);
2157 set_page_private(page, 0);
2158 page_cache_release(page);
39279cc3 2159 }
a52d9a80 2160 return ret;
39279cc3
CM		 2161}
2162
a52d9a80 2163static void btrfs_invalidatepage(struct page *page, unsigned long offset)
39279cc3 2164{
d1310b2e 2165 struct extent_io_tree *tree;
39279cc3 2166
d1310b2e 2167 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80
CM		 2168 extent_invalidatepage(tree, page, offset);
2169 btrfs_releasepage(page, GFP_NOFS);
39279cc3
CM		 2170}
2171
9ebefb18
CM		 2172/*
2173 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2174 * called from a page fault handler when a page is first dirtied. Hence we must
2175 * be careful to check for EOF conditions here. We set the page up correctly
2176 * for a written page which means we get ENOSPC checking when writing into
2177 * holes and correct delalloc and unwritten extent mapping on filesystems that
2178 * support these features.
2179 *
2180 * We are not allowed to take the i_mutex here so we have to play games to
2181 * protect against truncate races as the page could now be beyond EOF. Because
2182 * vmtruncate() writes the inode size before removing pages, once we have the
2183 * page lock we can determine safely if the page is beyond EOF. If it is not
2184 * beyond EOF, then the page is guaranteed safe against truncation until we
2185 * unlock the page.
2186 */
2187int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2188{
6da6abae 2189 struct inode *inode = fdentry(vma->vm_file)->d_inode;
1832a6d5 2190 struct btrfs_root *root = BTRFS_I(inode)->root;
9ebefb18
CM		 2191 unsigned long end;
2192 loff_t size;
1832a6d5 2193 int ret;
a52d9a80 2194 u64 page_start;
9ebefb18 2195
1832a6d5
CM		 2196 mutex_lock(&root->fs_info->fs_mutex);
2197 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
8f662a76 2198 mutex_unlock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2199 if (ret)
2200 goto out;
2201
2202 ret = -EINVAL;
2203
9ebefb18
CM		 2204 lock_page(page);
2205 wait_on_page_writeback(page);
9ebefb18 2206 size = i_size_read(inode);
35ebb934 2207 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 2208
9ebefb18 2209 if ((page->mapping != inode->i_mapping) ||
a52d9a80 2210 (page_start > size)) {
9ebefb18
CM		 2211 /* page got truncated out from underneath us */
2212 goto out_unlock;
2213 }
2214
2215 /* page is wholly or partially inside EOF */
a52d9a80 2216 if (page_start + PAGE_CACHE_SIZE > size)
9ebefb18
CM		 2217 end = size & ~PAGE_CACHE_MASK;
2218 else
2219 end = PAGE_CACHE_SIZE;
2220
b888db2b 2221 ret = btrfs_cow_one_page(inode, page, end);
9ebefb18
CM		 2222
2223out_unlock:
2224 unlock_page(page);
1832a6d5 2225out:
9ebefb18
CM		 2226 return ret;
2227}
2228
39279cc3
CM		 2229static void btrfs_truncate(struct inode *inode)
2230{
2231 struct btrfs_root *root = BTRFS_I(inode)->root;
2232 int ret;
2233 struct btrfs_trans_handle *trans;
d3c2fdcf 2234 unsigned long nr;
39279cc3
CM		 2235
2236 if (!S_ISREG(inode->i_mode))
2237 return;
2238 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2239 return;
2240
2241 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2242
2243 mutex_lock(&root->fs_info->fs_mutex);
2244 trans = btrfs_start_transaction(root, 1);
2245 btrfs_set_trans_block_group(trans, inode);
2246
2247 /* FIXME, add redo link to tree so we don't leak on crash */
85e21bac
CM		 2248 ret = btrfs_truncate_in_trans(trans, root, inode,
2249 BTRFS_EXTENT_DATA_KEY);
39279cc3 2250 btrfs_update_inode(trans, root, inode);
d3c2fdcf 2251 nr = trans->blocks_used;
5f39d397 2252
39279cc3
CM		 2253 ret = btrfs_end_transaction(trans, root);
2254 BUG_ON(ret);
2255 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2256 btrfs_btree_balance_dirty(root, nr);
e2008b61 2257 btrfs_throttle(root);
39279cc3
CM		 2258}
2259
4313b399
CM		 2260static int noinline create_subvol(struct btrfs_root *root, char *name,
2261 int namelen)
39279cc3
CM		 2262{
2263 struct btrfs_trans_handle *trans;
2264 struct btrfs_key key;
2265 struct btrfs_root_item root_item;
2266 struct btrfs_inode_item *inode_item;
5f39d397 2267 struct extent_buffer *leaf;
dc17ff8f 2268 struct btrfs_root *new_root = root;
39279cc3
CM		 2269 struct inode *inode;
2270 struct inode *dir;
2271 int ret;
54aa1f4d 2272 int err;
39279cc3
CM		 2273 u64 objectid;
2274 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
d3c2fdcf 2275 unsigned long nr = 1;
39279cc3
CM		 2276
2277 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2278 ret = btrfs_check_free_space(root, 1, 0);
2279 if (ret)
2280 goto fail_commit;
2281
39279cc3
CM		 2282 trans = btrfs_start_transaction(root, 1);
2283 BUG_ON(!trans);
2284
7bb86316
CM		 2285 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2286 0, &objectid);
2287 if (ret)
2288 goto fail;
2289
2290 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2291 objectid, trans->transid, 0, 0,
2292 0, 0);
5f39d397
CM		 2293 if (IS_ERR(leaf))
2294 return PTR_ERR(leaf);
2295
2296 btrfs_set_header_nritems(leaf, 0);
2297 btrfs_set_header_level(leaf, 0);
db94535d 2298 btrfs_set_header_bytenr(leaf, leaf->start);
5f39d397 2299 btrfs_set_header_generation(leaf, trans->transid);
7bb86316
CM		 2300 btrfs_set_header_owner(leaf, objectid);
2301
5f39d397
CM		 2302 write_extent_buffer(leaf, root->fs_info->fsid,
2303 (unsigned long)btrfs_header_fsid(leaf),
2304 BTRFS_FSID_SIZE);
2305 btrfs_mark_buffer_dirty(leaf);
39279cc3
CM		 2306
2307 inode_item = &root_item.inode;
2308 memset(inode_item, 0, sizeof(*inode_item));
5f39d397
CM		 2309 inode_item->generation = cpu_to_le64(1);
2310 inode_item->size = cpu_to_le64(3);
2311 inode_item->nlink = cpu_to_le32(1);
2312 inode_item->nblocks = cpu_to_le64(1);
2313 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
39279cc3 2314
db94535d
CM		 2315 btrfs_set_root_bytenr(&root_item, leaf->start);
2316 btrfs_set_root_level(&root_item, 0);
39279cc3 2317 btrfs_set_root_refs(&root_item, 1);
5f39d397
CM		 2318 btrfs_set_root_used(&root_item, 0);
2319
5eda7b5e
CM		 2320 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2321 root_item.drop_level = 0;
5f39d397
CM		 2322
2323 free_extent_buffer(leaf);
2324 leaf = NULL;
39279cc3 2325
39279cc3
CM		 2326 btrfs_set_root_dirid(&root_item, new_dirid);
2327
2328 key.objectid = objectid;
2329 key.offset = 1;
39279cc3
CM		 2330 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2331 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2332 &root_item);
54aa1f4d
CM		 2333 if (ret)
2334 goto fail;
39279cc3
CM		 2335
2336 /*
2337 * insert the directory item
2338 */
2339 key.offset = (u64)-1;
2340 dir = root->fs_info->sb->s_root->d_inode;
2341 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2342 name, namelen, dir->i_ino, &key,
2343 BTRFS_FT_DIR);
54aa1f4d
CM		 2344 if (ret)
2345 goto fail;
39279cc3 2346
3954401f
CM		 2347 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2348 name, namelen, objectid,
2349 root->fs_info->sb->s_root->d_inode->i_ino);
2350 if (ret)
2351 goto fail;
2352
39279cc3 2353 ret = btrfs_commit_transaction(trans, root);
54aa1f4d
CM		 2354 if (ret)
2355 goto fail_commit;
39279cc3 2356
58176a96 2357 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
39279cc3
CM		 2358 BUG_ON(!new_root);
2359
2360 trans = btrfs_start_transaction(new_root, 1);
2361 BUG_ON(!trans);
2362
9c58309d
CM		 2363 inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid,
2364 new_dirid,
39279cc3 2365 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
54aa1f4d
CM		 2366 if (IS_ERR(inode))
2367 goto fail;
39279cc3
CM		 2368 inode->i_op = &btrfs_dir_inode_operations;
2369 inode->i_fop = &btrfs_dir_file_operations;
34088780 2370 new_root->inode = inode;
39279cc3 2371
3954401f
CM		 2372 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2373 new_dirid);
39279cc3 2374 inode->i_nlink = 1;
3954401f 2375 inode->i_size = 0;
39279cc3 2376 ret = btrfs_update_inode(trans, new_root, inode);
54aa1f4d
CM		 2377 if (ret)
2378 goto fail;
2379fail:
d3c2fdcf 2380 nr = trans->blocks_used;
dc17ff8f 2381 err = btrfs_commit_transaction(trans, new_root);
54aa1f4d
CM		 2382 if (err && !ret)
2383 ret = err;
2384fail_commit:
39279cc3 2385 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2386 btrfs_btree_balance_dirty(root, nr);
e2008b61 2387 btrfs_throttle(root);
54aa1f4d 2388 return ret;
39279cc3
CM		 2389}
2390
2391static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2392{
3063d29f 2393 struct btrfs_pending_snapshot *pending_snapshot;
39279cc3 2394 struct btrfs_trans_handle *trans;
39279cc3 2395 int ret;
54aa1f4d 2396 int err;
1832a6d5 2397 unsigned long nr = 0;
39279cc3
CM		 2398
2399 if (!root->ref_cows)
2400 return -EINVAL;
2401
2402 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2403 ret = btrfs_check_free_space(root, 1, 0);
2404 if (ret)
2405 goto fail_unlock;
2406
3063d29f
CM		 2407 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
2408 if (!pending_snapshot) {
2409 ret = -ENOMEM;
2410 goto fail_unlock;
2411 }
fb4bc1e0 2412 pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
3063d29f
CM		 2413 if (!pending_snapshot->name) {
2414 ret = -ENOMEM;
2415 kfree(pending_snapshot);
2416 goto fail_unlock;
2417 }
fb4bc1e0
Y		 2418 memcpy(pending_snapshot->name, name, namelen);
2419 pending_snapshot->name[namelen] = '\0';
39279cc3
CM		 2420 trans = btrfs_start_transaction(root, 1);
2421 BUG_ON(!trans);
3063d29f
CM		 2422 pending_snapshot->root = root;
2423 list_add(&pending_snapshot->list,
2424 &trans->transaction->pending_snapshots);
39279cc3 2425 ret = btrfs_update_inode(trans, root, root->inode);
54aa1f4d 2426 err = btrfs_commit_transaction(trans, root);
5f39d397 2427
1832a6d5 2428fail_unlock:
39279cc3 2429 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2430 btrfs_btree_balance_dirty(root, nr);
e2008b61 2431 btrfs_throttle(root);
54aa1f4d 2432 return ret;
39279cc3
CM		 2433}
2434
edbd8d4e 2435unsigned long btrfs_force_ra(struct address_space *mapping,
86479a04
CM		 2436 struct file_ra_state *ra, struct file *file,
2437 pgoff_t offset, pgoff_t last_index)
2438{
2439 pgoff_t req_size;
2440
2441#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2442 req_size = last_index - offset + 1;
2443 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2444 return offset;
2445#else
2446 req_size = min(last_index - offset + 1, (pgoff_t)128);
2447 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2448 return offset + req_size;
2449#endif
2450}
2451
2452int btrfs_defrag_file(struct file *file) {
6da6abae 2453 struct inode *inode = fdentry(file)->d_inode;
1832a6d5 2454 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 2455 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
86479a04
CM		 2456 struct page *page;
2457 unsigned long last_index;
2458 unsigned long ra_index = 0;
2459 u64 page_start;
2460 u64 page_end;
2461 unsigned long i;
1832a6d5
CM		 2462 int ret;
2463
2464 mutex_lock(&root->fs_info->fs_mutex);
2465 ret = btrfs_check_free_space(root, inode->i_size, 0);
2466 mutex_unlock(&root->fs_info->fs_mutex);
2467 if (ret)
2468 return -ENOSPC;
86479a04
CM		 2469
2470 mutex_lock(&inode->i_mutex);
2471 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2472 for (i = 0; i <= last_index; i++) {
2473 if (i == ra_index) {
edbd8d4e
CM		 2474 ra_index = btrfs_force_ra(inode->i_mapping,
2475 &file->f_ra,
2476 file, ra_index, last_index);
86479a04
CM		 2477 }
2478 page = grab_cache_page(inode->i_mapping, i);
2479 if (!page)
2480 goto out_unlock;
2481 if (!PageUptodate(page)) {
2482 btrfs_readpage(NULL, page);
2483 lock_page(page);
2484 if (!PageUptodate(page)) {
2485 unlock_page(page);
2486 page_cache_release(page);
2487 goto out_unlock;
2488 }
2489 }
35ebb934 2490 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
86479a04
CM		 2491 page_end = page_start + PAGE_CACHE_SIZE - 1;
2492
d1310b2e 2493 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
d1310b2e 2494 set_extent_delalloc(io_tree, page_start,
86479a04 2495 page_end, GFP_NOFS);
edbd8d4e 2496
d1310b2e 2497 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
86479a04
CM		 2498 set_page_dirty(page);
2499 unlock_page(page);
2500 page_cache_release(page);
2501 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2502 }
2503
2504out_unlock:
2505 mutex_unlock(&inode->i_mutex);
2506 return 0;
2507}
2508
edbd8d4e
CM		 2509static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2510{
2511 u64 new_size;
2512 u64 old_size;
2513 struct btrfs_ioctl_vol_args *vol_args;
2514 struct btrfs_trans_handle *trans;
2515 char *sizestr;
2516 int ret = 0;
2517 int namelen;
2518 int mod = 0;
2519
2520 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2521
2522 if (!vol_args)
2523 return -ENOMEM;
2524
2525 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2526 ret = -EFAULT;
2527 goto out;
2528 }
2529 namelen = strlen(vol_args->name);
2530 if (namelen > BTRFS_VOL_NAME_MAX) {
2531 ret = -EINVAL;
2532 goto out;
2533 }
2534
2535 sizestr = vol_args->name;
2536 if (!strcmp(sizestr, "max"))
2537 new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
2538 else {
2539 if (sizestr[0] == '-') {
2540 mod = -1;
2541 sizestr++;
2542 } else if (sizestr[0] == '+') {
2543 mod = 1;
2544 sizestr++;
2545 }
2546 new_size = btrfs_parse_size(sizestr);
2547 if (new_size == 0) {
2548 ret = -EINVAL;
2549 goto out;
2550 }
2551 }
2552
2553 mutex_lock(&root->fs_info->fs_mutex);
2554 old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);
2555
2556 if (mod < 0) {
2557 if (new_size > old_size) {
2558 ret = -EINVAL;
2559 goto out_unlock;
2560 }
2561 new_size = old_size - new_size;
2562 } else if (mod > 0) {
2563 new_size = old_size + new_size;
2564 }
2565
2566 if (new_size < 256 * 1024 * 1024) {
2567 ret = -EINVAL;
2568 goto out_unlock;
2569 }
2570 if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
2571 ret = -EFBIG;
2572 goto out_unlock;
2573 }
f9ef6604
CM		 2574
2575 do_div(new_size, root->sectorsize);
2576 new_size *= root->sectorsize;
edbd8d4e
CM		 2577
2578printk("new size is %Lu\n", new_size);
2579 if (new_size > old_size) {
2580 trans = btrfs_start_transaction(root, 1);
2581 ret = btrfs_grow_extent_tree(trans, root, new_size);
2582 btrfs_commit_transaction(trans, root);
2583 } else {
2584 ret = btrfs_shrink_extent_tree(root, new_size);
2585 }
2586
2587out_unlock:
2588 mutex_unlock(&root->fs_info->fs_mutex);
2589out:
2590 kfree(vol_args);
2591 return ret;
2592}
2593
4313b399
CM		 2594static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
2595 void __user *arg)
39279cc3 2596{
4aec2b52 2597 struct btrfs_ioctl_vol_args *vol_args;
39279cc3 2598 struct btrfs_dir_item *di;
39279cc3
CM		 2599 struct btrfs_path *path;
2600 u64 root_dirid;
4aec2b52
CM		 2601 int namelen;
2602 int ret;
39279cc3 2603
4aec2b52 2604 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
5f39d397 2605
4aec2b52
CM		 2606 if (!vol_args)
2607 return -ENOMEM;
2608
2609 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2610 ret = -EFAULT;
2611 goto out;
2612 }
2613
2614 namelen = strlen(vol_args->name);
2615 if (namelen > BTRFS_VOL_NAME_MAX) {
2616 ret = -EINVAL;
2617 goto out;
2618 }
2619 if (strchr(vol_args->name, '/')) {
2620 ret = -EINVAL;
2621 goto out;
2622 }
d03581f4
CH		 2623
2624 path = btrfs_alloc_path();
4aec2b52
CM		 2625 if (!path) {
2626 ret = -ENOMEM;
2627 goto out;
2628 }
d03581f4
CH		 2629
2630 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2631 mutex_lock(&root->fs_info->fs_mutex);
2632 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2633 path, root_dirid,
4aec2b52 2634 vol_args->name, namelen, 0);
d03581f4
CH		 2635 mutex_unlock(&root->fs_info->fs_mutex);
2636 btrfs_free_path(path);
4aec2b52
CM		 2637
2638 if (di && !IS_ERR(di)) {
2639 ret = -EEXIST;
2640 goto out;
2641 }
2642
2643 if (IS_ERR(di)) {
2644 ret = PTR_ERR(di);
2645 goto out;
2646 }
d03581f4
CH		 2647
2648 if (root == root->fs_info->tree_root)
4aec2b52
CM		 2649 ret = create_subvol(root, vol_args->name, namelen);
2650 else
2651 ret = create_snapshot(root, vol_args->name, namelen);
2652out:
2653 kfree(vol_args);
2654 return ret;
d03581f4
CH		 2655}
2656
2657static int btrfs_ioctl_defrag(struct file *file)
2658{
6da6abae 2659 struct inode *inode = fdentry(file)->d_inode;
d03581f4
CH		 2660 struct btrfs_root *root = BTRFS_I(inode)->root;
2661
2662 switch (inode->i_mode & S_IFMT) {
2663 case S_IFDIR:
39279cc3 2664 mutex_lock(&root->fs_info->fs_mutex);
d03581f4
CH		 2665 btrfs_defrag_root(root, 0);
2666 btrfs_defrag_root(root->fs_info->extent_root, 0);
39279cc3 2667 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3 2668 break;
d03581f4
CH		 2669 case S_IFREG:
2670 btrfs_defrag_file(file);
2671 break;
2672 }
2673
2674 return 0;
2675}
6702ed49 2676
d03581f4
CH		 2677long btrfs_ioctl(struct file *file, unsigned int
2678 cmd, unsigned long arg)
2679{
6da6abae 2680 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
d03581f4
CH		 2681
2682 switch (cmd) {
2683 case BTRFS_IOC_SNAP_CREATE:
2684 return btrfs_ioctl_snap_create(root, (void __user *)arg);
6702ed49 2685 case BTRFS_IOC_DEFRAG:
d03581f4 2686 return btrfs_ioctl_defrag(file);
edbd8d4e
CM		 2687 case BTRFS_IOC_RESIZE:
2688 return btrfs_ioctl_resize(root, (void __user *)arg);
39279cc3 2689 }
d03581f4
CH		 2690
2691 return -ENOTTY;
39279cc3
CM		 2692}
2693
39279cc3
CM		 2694/*
2695 * Called inside transaction, so use GFP_NOFS
2696 */
2697struct inode *btrfs_alloc_inode(struct super_block *sb)
2698{
2699 struct btrfs_inode *ei;
2700
2701 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2702 if (!ei)
2703 return NULL;
15ee9bc7 2704 ei->last_trans = 0;
dc17ff8f 2705 ei->ordered_trans = 0;
39279cc3
CM		 2706 return &ei->vfs_inode;
2707}
2708
2709void btrfs_destroy_inode(struct inode *inode)
2710{
2711 WARN_ON(!list_empty(&inode->i_dentry));
2712 WARN_ON(inode->i_data.nrpages);
2713
8c416c9e 2714 btrfs_drop_extent_cache(inode, 0, (u64)-1);
39279cc3
CM		 2715 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2716}
2717
44ec0b71
CM		 2718#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2719static void init_once(struct kmem_cache * cachep, void *foo)
2720#else
39279cc3
CM		 2721static void init_once(void * foo, struct kmem_cache * cachep,
2722 unsigned long flags)
44ec0b71 2723#endif
39279cc3
CM		 2724{
2725 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2726
2727 inode_init_once(&ei->vfs_inode);
2728}
2729
2730void btrfs_destroy_cachep(void)
2731{
2732 if (btrfs_inode_cachep)
2733 kmem_cache_destroy(btrfs_inode_cachep);
2734 if (btrfs_trans_handle_cachep)
2735 kmem_cache_destroy(btrfs_trans_handle_cachep);
2736 if (btrfs_transaction_cachep)
2737 kmem_cache_destroy(btrfs_transaction_cachep);
2738 if (btrfs_bit_radix_cachep)
2739 kmem_cache_destroy(btrfs_bit_radix_cachep);
2740 if (btrfs_path_cachep)
2741 kmem_cache_destroy(btrfs_path_cachep);
2742}
2743
86479a04 2744struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
92fee66d 2745 unsigned long extra_flags,
44ec0b71
CM		 2746#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2747 void (*ctor)(struct kmem_cache *, void *)
2748#else
92fee66d 2749 void (*ctor)(void *, struct kmem_cache *,
44ec0b71
CM		 2750 unsigned long)
2751#endif
2752 )
92fee66d
CM		 2753{
2754 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2755 SLAB_MEM_SPREAD | extra_flags), ctor
2756#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2757 ,NULL
2758#endif
2759 );
2760}
2761
39279cc3
CM		 2762int btrfs_init_cachep(void)
2763{
86479a04 2764 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
92fee66d
CM		 2765 sizeof(struct btrfs_inode),
2766 0, init_once);
39279cc3
CM		 2767 if (!btrfs_inode_cachep)
2768 goto fail;
86479a04
CM		 2769 btrfs_trans_handle_cachep =
2770 btrfs_cache_create("btrfs_trans_handle_cache",
2771 sizeof(struct btrfs_trans_handle),
2772 0, NULL);
39279cc3
CM		 2773 if (!btrfs_trans_handle_cachep)
2774 goto fail;
86479a04 2775 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
39279cc3 2776 sizeof(struct btrfs_transaction),
92fee66d 2777 0, NULL);
39279cc3
CM		 2778 if (!btrfs_transaction_cachep)
2779 goto fail;
86479a04 2780 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
23223584 2781 sizeof(struct btrfs_path),
92fee66d 2782 0, NULL);
39279cc3
CM		 2783 if (!btrfs_path_cachep)
2784 goto fail;
86479a04 2785 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
92fee66d 2786 SLAB_DESTROY_BY_RCU, NULL);
39279cc3
CM		 2787 if (!btrfs_bit_radix_cachep)
2788 goto fail;
2789 return 0;
2790fail:
2791 btrfs_destroy_cachep();
2792 return -ENOMEM;
2793}
2794
2795static int btrfs_getattr(struct vfsmount *mnt,
2796 struct dentry *dentry, struct kstat *stat)
2797{
2798 struct inode *inode = dentry->d_inode;
2799 generic_fillattr(inode, stat);
d6667462 2800 stat->blksize = PAGE_CACHE_SIZE;
39279cc3
CM		 2801 return 0;
2802}
2803
2804static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
2805 struct inode * new_dir,struct dentry *new_dentry)
2806{
2807 struct btrfs_trans_handle *trans;
2808 struct btrfs_root *root = BTRFS_I(old_dir)->root;
2809 struct inode *new_inode = new_dentry->d_inode;
2810 struct inode *old_inode = old_dentry->d_inode;
2811 struct timespec ctime = CURRENT_TIME;
2812 struct btrfs_path *path;
39279cc3
CM		 2813 int ret;
2814
2815 if (S_ISDIR(old_inode->i_mode) && new_inode &&
2816 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
2817 return -ENOTEMPTY;
2818 }
5f39d397 2819
39279cc3 2820 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2821 ret = btrfs_check_free_space(root, 1, 0);
2822 if (ret)
2823 goto out_unlock;
2824
39279cc3 2825 trans = btrfs_start_transaction(root, 1);
5f39d397 2826
39279cc3
CM		 2827 btrfs_set_trans_block_group(trans, new_dir);
2828 path = btrfs_alloc_path();
2829 if (!path) {
2830 ret = -ENOMEM;
2831 goto out_fail;
2832 }
2833
2834 old_dentry->d_inode->i_nlink++;
2835 old_dir->i_ctime = old_dir->i_mtime = ctime;
2836 new_dir->i_ctime = new_dir->i_mtime = ctime;
2837 old_inode->i_ctime = ctime;
5f39d397 2838
39279cc3
CM		 2839 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
2840 if (ret)
2841 goto out_fail;
2842
2843 if (new_inode) {
2844 new_inode->i_ctime = CURRENT_TIME;
2845 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
2846 if (ret)
2847 goto out_fail;
39279cc3 2848 }
9c58309d 2849 ret = btrfs_add_link(trans, new_dentry, old_inode, 1);
39279cc3
CM		 2850 if (ret)
2851 goto out_fail;
2852
2853out_fail:
2854 btrfs_free_path(path);
2855 btrfs_end_transaction(trans, root);
1832a6d5 2856out_unlock:
39279cc3
CM		 2857 mutex_unlock(&root->fs_info->fs_mutex);
2858 return ret;
2859}
2860
2861static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
2862 const char *symname)
2863{
2864 struct btrfs_trans_handle *trans;
2865 struct btrfs_root *root = BTRFS_I(dir)->root;
2866 struct btrfs_path *path;
2867 struct btrfs_key key;
1832a6d5 2868 struct inode *inode = NULL;
39279cc3
CM		 2869 int err;
2870 int drop_inode = 0;
2871 u64 objectid;
2872 int name_len;
2873 int datasize;
5f39d397 2874 unsigned long ptr;
39279cc3 2875 struct btrfs_file_extent_item *ei;
5f39d397 2876 struct extent_buffer *leaf;
1832a6d5 2877 unsigned long nr = 0;
39279cc3
CM		 2878
2879 name_len = strlen(symname) + 1;
2880 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
2881 return -ENAMETOOLONG;
1832a6d5 2882
39279cc3 2883 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2884 err = btrfs_check_free_space(root, 1, 0);
2885 if (err)
2886 goto out_fail;
2887
39279cc3
CM		 2888 trans = btrfs_start_transaction(root, 1);
2889 btrfs_set_trans_block_group(trans, dir);
2890
2891 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2892 if (err) {
2893 err = -ENOSPC;
2894 goto out_unlock;
2895 }
2896
9c58309d
CM		 2897 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
2898 dentry->d_name.len,
2899 dentry->d_parent->d_inode->i_ino, objectid,
39279cc3
CM		 2900 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
2901 err = PTR_ERR(inode);
2902 if (IS_ERR(inode))
2903 goto out_unlock;
2904
2905 btrfs_set_trans_block_group(trans, inode);
9c58309d 2906 err = btrfs_add_nondir(trans, dentry, inode, 0);
39279cc3
CM		 2907 if (err)
2908 drop_inode = 1;
2909 else {
2910 inode->i_mapping->a_ops = &btrfs_aops;
2911 inode->i_fop = &btrfs_file_operations;
2912 inode->i_op = &btrfs_file_inode_operations;
d1310b2e
CM		 2913 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
2914 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
a52d9a80 2915 inode->i_mapping, GFP_NOFS);
d1310b2e 2916 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 2917 }
2918 dir->i_sb->s_dirt = 1;
2919 btrfs_update_inode_block_group(trans, inode);
2920 btrfs_update_inode_block_group(trans, dir);
2921 if (drop_inode)
2922 goto out_unlock;
2923
2924 path = btrfs_alloc_path();
2925 BUG_ON(!path);
2926 key.objectid = inode->i_ino;
2927 key.offset = 0;
39279cc3
CM		 2928 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2929 datasize = btrfs_file_extent_calc_inline_size(name_len);
2930 err = btrfs_insert_empty_item(trans, root, path, &key,
2931 datasize);
54aa1f4d
CM		 2932 if (err) {
2933 drop_inode = 1;
2934 goto out_unlock;
2935 }
5f39d397
CM		 2936 leaf = path->nodes[0];
2937 ei = btrfs_item_ptr(leaf, path->slots[0],
2938 struct btrfs_file_extent_item);
2939 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
2940 btrfs_set_file_extent_type(leaf, ei,
39279cc3
CM		 2941 BTRFS_FILE_EXTENT_INLINE);
2942 ptr = btrfs_file_extent_inline_start(ei);
5f39d397
CM		 2943 write_extent_buffer(leaf, symname, ptr, name_len);
2944 btrfs_mark_buffer_dirty(leaf);
39279cc3 2945 btrfs_free_path(path);
5f39d397 2946
39279cc3
CM		 2947 inode->i_op = &btrfs_symlink_inode_operations;
2948 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2949 inode->i_size = name_len - 1;
54aa1f4d
CM		 2950 err = btrfs_update_inode(trans, root, inode);
2951 if (err)
2952 drop_inode = 1;
39279cc3
CM		 2953
2954out_unlock:
d3c2fdcf 2955 nr = trans->blocks_used;
39279cc3 2956 btrfs_end_transaction(trans, root);
1832a6d5 2957out_fail:
39279cc3 2958 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 2959 if (drop_inode) {
2960 inode_dec_link_count(inode);
2961 iput(inode);
2962 }
d3c2fdcf 2963 btrfs_btree_balance_dirty(root, nr);
e2008b61 2964 btrfs_throttle(root);
39279cc3
CM		 2965 return err;
2966}
fdebe2bd
Y		 2967static int btrfs_permission(struct inode *inode, int mask,
2968 struct nameidata *nd)
2969{
2970 if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
2971 return -EACCES;
2972 return generic_permission(inode, mask, NULL);
2973}
39279cc3
CM		 2974
2975static struct inode_operations btrfs_dir_inode_operations = {
2976 .lookup = btrfs_lookup,
2977 .create = btrfs_create,
2978 .unlink = btrfs_unlink,
2979 .link = btrfs_link,
2980 .mkdir = btrfs_mkdir,
2981 .rmdir = btrfs_rmdir,
2982 .rename = btrfs_rename,
2983 .symlink = btrfs_symlink,
2984 .setattr = btrfs_setattr,
618e21d5 2985 .mknod = btrfs_mknod,
5103e947
JB		 2986 .setxattr = generic_setxattr,
2987 .getxattr = generic_getxattr,
2988 .listxattr = btrfs_listxattr,
2989 .removexattr = generic_removexattr,
fdebe2bd 2990 .permission = btrfs_permission,
39279cc3 2991};
39279cc3
CM		 2992static struct inode_operations btrfs_dir_ro_inode_operations = {
2993 .lookup = btrfs_lookup,
fdebe2bd 2994 .permission = btrfs_permission,
39279cc3 2995};
39279cc3
CM		 2996static struct file_operations btrfs_dir_file_operations = {
2997 .llseek = generic_file_llseek,
2998 .read = generic_read_dir,
2999 .readdir = btrfs_readdir,
34287aa3 3000 .unlocked_ioctl = btrfs_ioctl,
39279cc3 3001#ifdef CONFIG_COMPAT
34287aa3 3002 .compat_ioctl = btrfs_ioctl,
39279cc3
CM		 3003#endif
3004};
3005
d1310b2e 3006static struct extent_io_ops btrfs_extent_io_ops = {
07157aac
CM		 3007 .fill_delalloc = run_delalloc_range,
3008 .writepage_io_hook = btrfs_writepage_io_hook,
3009 .readpage_io_hook = btrfs_readpage_io_hook,
3010 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
3011};
3012
39279cc3
CM		 3013static struct address_space_operations btrfs_aops = {
3014 .readpage = btrfs_readpage,
3015 .writepage = btrfs_writepage,
b293f02e 3016 .writepages = btrfs_writepages,
3ab2fb5a 3017 .readpages = btrfs_readpages,
39279cc3 3018 .sync_page = block_sync_page,
39279cc3 3019 .bmap = btrfs_bmap,
a52d9a80
CM		 3020 .invalidatepage = btrfs_invalidatepage,
3021 .releasepage = btrfs_releasepage,
3022 .set_page_dirty = __set_page_dirty_nobuffers,
39279cc3
CM		 3023};
3024
3025static struct address_space_operations btrfs_symlink_aops = {
3026 .readpage = btrfs_readpage,
3027 .writepage = btrfs_writepage,
2bf5a725
CM		 3028 .invalidatepage = btrfs_invalidatepage,
3029 .releasepage = btrfs_releasepage,
39279cc3
CM		 3030};
3031
3032static struct inode_operations btrfs_file_inode_operations = {
3033 .truncate = btrfs_truncate,
3034 .getattr = btrfs_getattr,
3035 .setattr = btrfs_setattr,
5103e947
JB		 3036 .setxattr = generic_setxattr,
3037 .getxattr = generic_getxattr,
3038 .listxattr = btrfs_listxattr,
3039 .removexattr = generic_removexattr,
fdebe2bd 3040 .permission = btrfs_permission,
39279cc3 3041};
618e21d5
JB		 3042static struct inode_operations btrfs_special_inode_operations = {
3043 .getattr = btrfs_getattr,
3044 .setattr = btrfs_setattr,
fdebe2bd 3045 .permission = btrfs_permission,
618e21d5 3046};
39279cc3
CM		 3047static struct inode_operations btrfs_symlink_inode_operations = {
3048 .readlink = generic_readlink,
3049 .follow_link = page_follow_link_light,
3050 .put_link = page_put_link,
fdebe2bd 3051 .permission = btrfs_permission,
39279cc3 3052};
Linux 6.x block layer and io_uring tree(s)