2 * Copyright (C) 2007 Oracle. All rights reserved.
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.
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.
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.
19 #include <linux/buffer_head.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>
33 #include <linux/bit_spinlock.h>
34 #include <linux/version.h>
35 #include <linux/xattr.h>
38 #include "transaction.h"
39 #include "btrfs_inode.h"
41 #include "print-tree.h"
43 struct btrfs_iget_args {
45 struct btrfs_root *root;
48 static struct inode_operations btrfs_dir_inode_operations;
49 static struct inode_operations btrfs_symlink_inode_operations;
50 static struct inode_operations btrfs_dir_ro_inode_operations;
51 static struct inode_operations btrfs_special_inode_operations;
52 static struct inode_operations btrfs_file_inode_operations;
53 static struct address_space_operations btrfs_aops;
54 static struct address_space_operations btrfs_symlink_aops;
55 static struct file_operations btrfs_dir_file_operations;
56 static struct extent_map_ops btrfs_extent_map_ops;
58 static struct kmem_cache *btrfs_inode_cachep;
59 struct kmem_cache *btrfs_trans_handle_cachep;
60 struct kmem_cache *btrfs_transaction_cachep;
61 struct kmem_cache *btrfs_bit_radix_cachep;
62 struct kmem_cache *btrfs_path_cachep;
65 static 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,
75 int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
78 u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy);
79 u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy);
90 spin_lock(&root->fs_info->delalloc_lock);
91 if (used + root->fs_info->delalloc_bytes + num_required > thresh)
93 spin_unlock(&root->fs_info->delalloc_lock);
97 static int cow_file_range(struct inode *inode, u64 start, u64 end)
99 struct btrfs_root *root = BTRFS_I(inode)->root;
100 struct btrfs_trans_handle *trans;
104 u64 blocksize = root->sectorsize;
105 struct btrfs_key ins;
108 trans = btrfs_start_transaction(root, 1);
110 btrfs_set_trans_block_group(trans, inode);
112 num_bytes = (end - start + blocksize) & ~(blocksize - 1);
113 num_bytes = max(blocksize, num_bytes);
114 ret = btrfs_drop_extents(trans, root, inode,
115 start, start + num_bytes, start, &alloc_hint);
117 if (alloc_hint == EXTENT_MAP_INLINE)
120 while(num_bytes > 0) {
121 cur_alloc_size = min(num_bytes, root->fs_info->max_extent);
122 ret = btrfs_alloc_extent(trans, root, cur_alloc_size,
123 root->root_key.objectid,
125 inode->i_ino, start, 0,
126 alloc_hint, (u64)-1, &ins, 1);
131 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
132 start, ins.objectid, ins.offset,
134 num_bytes -= cur_alloc_size;
135 alloc_hint = ins.objectid + ins.offset;
136 start += cur_alloc_size;
138 btrfs_add_ordered_inode(inode);
140 btrfs_end_transaction(trans, root);
144 static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end)
151 struct btrfs_root *root = BTRFS_I(inode)->root;
152 struct extent_buffer *leaf;
154 struct btrfs_path *path;
155 struct btrfs_file_extent_item *item;
158 struct btrfs_key found_key;
160 path = btrfs_alloc_path();
163 ret = btrfs_lookup_file_extent(NULL, root, path,
164 inode->i_ino, start, 0);
166 btrfs_free_path(path);
172 if (path->slots[0] == 0)
177 leaf = path->nodes[0];
178 item = btrfs_item_ptr(leaf, path->slots[0],
179 struct btrfs_file_extent_item);
181 /* are we inside the extent that was found? */
182 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
183 found_type = btrfs_key_type(&found_key);
184 if (found_key.objectid != inode->i_ino ||
185 found_type != BTRFS_EXTENT_DATA_KEY) {
189 found_type = btrfs_file_extent_type(leaf, item);
190 extent_start = found_key.offset;
191 if (found_type == BTRFS_FILE_EXTENT_REG) {
192 extent_end = extent_start +
193 btrfs_file_extent_num_bytes(leaf, item);
196 if (loops && start != extent_start)
199 if (start < extent_start || start >= extent_end)
202 cow_end = min(end, extent_end - 1);
203 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
207 if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) {
217 btrfs_free_path(path);
220 btrfs_release_path(root, path);
225 cow_file_range(inode, start, cow_end);
230 static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
232 struct btrfs_root *root = BTRFS_I(inode)->root;
236 mutex_lock(&root->fs_info->fs_mutex);
237 if (btrfs_test_opt(root, NODATACOW))
238 ret = run_delalloc_nocow(inode, start, end);
240 ret = cow_file_range(inode, start, end);
242 spin_lock(&root->fs_info->delalloc_lock);
243 num_bytes = end + 1 - start;
244 if (root->fs_info->delalloc_bytes < num_bytes) {
245 printk("delalloc accounting error total %llu sub %llu\n",
246 root->fs_info->delalloc_bytes, num_bytes);
248 root->fs_info->delalloc_bytes -= num_bytes;
250 spin_unlock(&root->fs_info->delalloc_lock);
252 mutex_unlock(&root->fs_info->fs_mutex);
256 int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end)
258 struct inode *inode = page->mapping->host;
259 struct btrfs_root *root = BTRFS_I(inode)->root;
260 struct btrfs_trans_handle *trans;
263 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
264 size_t offset = start - page_start;
266 if (btrfs_test_opt(root, NODATASUM))
269 mutex_lock(&root->fs_info->fs_mutex);
270 trans = btrfs_start_transaction(root, 1);
271 btrfs_set_trans_block_group(trans, inode);
273 btrfs_csum_file_block(trans, root, inode, inode->i_ino,
274 start, kaddr + offset, end - start + 1);
276 ret = btrfs_end_transaction(trans, root);
278 mutex_unlock(&root->fs_info->fs_mutex);
282 int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
285 struct inode *inode = page->mapping->host;
286 struct btrfs_root *root = BTRFS_I(inode)->root;
287 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
288 struct btrfs_csum_item *item;
289 struct btrfs_path *path = NULL;
292 if (btrfs_test_opt(root, NODATASUM))
295 mutex_lock(&root->fs_info->fs_mutex);
296 path = btrfs_alloc_path();
297 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
300 /* a csum that isn't present is a preallocated region. */
301 if (ret == -ENOENT || ret == -EFBIG)
306 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
308 set_state_private(em_tree, start, csum);
311 btrfs_free_path(path);
312 mutex_unlock(&root->fs_info->fs_mutex);
316 int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
318 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
319 struct inode *inode = page->mapping->host;
320 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
324 struct btrfs_root *root = BTRFS_I(inode)->root;
328 if (btrfs_test_opt(root, NODATASUM))
331 ret = get_state_private(em_tree, start, &private);
332 local_irq_save(flags);
333 kaddr = kmap_atomic(page, KM_IRQ0);
337 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
338 btrfs_csum_final(csum, (char *)&csum);
339 if (csum != private) {
342 kunmap_atomic(kaddr, KM_IRQ0);
343 local_irq_restore(flags);
347 printk("btrfs csum failed ino %lu off %llu\n",
348 page->mapping->host->i_ino, (unsigned long long)start);
349 memset(kaddr + offset, 1, end - start + 1);
350 flush_dcache_page(page);
351 kunmap_atomic(kaddr, KM_IRQ0);
352 local_irq_restore(flags);
356 void btrfs_read_locked_inode(struct inode *inode)
358 struct btrfs_path *path;
359 struct extent_buffer *leaf;
360 struct btrfs_inode_item *inode_item;
361 struct btrfs_inode_timespec *tspec;
362 struct btrfs_root *root = BTRFS_I(inode)->root;
363 struct btrfs_key location;
364 u64 alloc_group_block;
368 path = btrfs_alloc_path();
370 mutex_lock(&root->fs_info->fs_mutex);
371 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
373 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
377 leaf = path->nodes[0];
378 inode_item = btrfs_item_ptr(leaf, path->slots[0],
379 struct btrfs_inode_item);
381 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
382 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
383 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
384 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
385 inode->i_size = btrfs_inode_size(leaf, inode_item);
387 tspec = btrfs_inode_atime(inode_item);
388 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
389 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
391 tspec = btrfs_inode_mtime(inode_item);
392 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
393 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
395 tspec = btrfs_inode_ctime(inode_item);
396 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
397 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
399 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
400 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
402 rdev = btrfs_inode_rdev(leaf, inode_item);
404 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
405 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
408 if (!BTRFS_I(inode)->block_group) {
409 BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
412 btrfs_free_path(path);
415 mutex_unlock(&root->fs_info->fs_mutex);
417 switch (inode->i_mode & S_IFMT) {
419 inode->i_mapping->a_ops = &btrfs_aops;
420 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
421 inode->i_fop = &btrfs_file_operations;
422 inode->i_op = &btrfs_file_inode_operations;
425 inode->i_fop = &btrfs_dir_file_operations;
426 if (root == root->fs_info->tree_root)
427 inode->i_op = &btrfs_dir_ro_inode_operations;
429 inode->i_op = &btrfs_dir_inode_operations;
432 inode->i_op = &btrfs_symlink_inode_operations;
433 inode->i_mapping->a_ops = &btrfs_symlink_aops;
436 init_special_inode(inode, inode->i_mode, rdev);
442 btrfs_release_path(root, path);
443 btrfs_free_path(path);
444 mutex_unlock(&root->fs_info->fs_mutex);
445 make_bad_inode(inode);
448 static void fill_inode_item(struct extent_buffer *leaf,
449 struct btrfs_inode_item *item,
452 btrfs_set_inode_uid(leaf, item, inode->i_uid);
453 btrfs_set_inode_gid(leaf, item, inode->i_gid);
454 btrfs_set_inode_size(leaf, item, inode->i_size);
455 btrfs_set_inode_mode(leaf, item, inode->i_mode);
456 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
458 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
459 inode->i_atime.tv_sec);
460 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
461 inode->i_atime.tv_nsec);
463 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
464 inode->i_mtime.tv_sec);
465 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
466 inode->i_mtime.tv_nsec);
468 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
469 inode->i_ctime.tv_sec);
470 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
471 inode->i_ctime.tv_nsec);
473 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
474 btrfs_set_inode_generation(leaf, item, inode->i_generation);
475 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
476 btrfs_set_inode_block_group(leaf, item,
477 BTRFS_I(inode)->block_group->key.objectid);
480 int btrfs_update_inode(struct btrfs_trans_handle *trans,
481 struct btrfs_root *root,
484 struct btrfs_inode_item *inode_item;
485 struct btrfs_path *path;
486 struct extent_buffer *leaf;
489 path = btrfs_alloc_path();
491 ret = btrfs_lookup_inode(trans, root, path,
492 &BTRFS_I(inode)->location, 1);
499 leaf = path->nodes[0];
500 inode_item = btrfs_item_ptr(leaf, path->slots[0],
501 struct btrfs_inode_item);
503 fill_inode_item(leaf, inode_item, inode);
504 btrfs_mark_buffer_dirty(leaf);
505 btrfs_set_inode_last_trans(trans, inode);
508 btrfs_release_path(root, path);
509 btrfs_free_path(path);
514 static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
515 struct btrfs_root *root,
517 struct dentry *dentry)
519 struct btrfs_path *path;
520 const char *name = dentry->d_name.name;
521 int name_len = dentry->d_name.len;
523 struct extent_buffer *leaf;
524 struct btrfs_dir_item *di;
525 struct btrfs_key key;
527 path = btrfs_alloc_path();
533 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
543 leaf = path->nodes[0];
544 btrfs_dir_item_key_to_cpu(leaf, di, &key);
545 ret = btrfs_delete_one_dir_name(trans, root, path, di);
548 btrfs_release_path(root, path);
550 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
551 key.objectid, name, name_len, -1);
560 ret = btrfs_delete_one_dir_name(trans, root, path, di);
562 dentry->d_inode->i_ctime = dir->i_ctime;
563 ret = btrfs_del_inode_ref(trans, root, name, name_len,
564 dentry->d_inode->i_ino,
565 dentry->d_parent->d_inode->i_ino);
567 printk("failed to delete reference to %.*s, "
568 "inode %lu parent %lu\n", name_len, name,
569 dentry->d_inode->i_ino,
570 dentry->d_parent->d_inode->i_ino);
573 btrfs_free_path(path);
575 dir->i_size -= name_len * 2;
576 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
577 btrfs_update_inode(trans, root, dir);
578 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
579 dentry->d_inode->i_nlink--;
581 drop_nlink(dentry->d_inode);
583 ret = btrfs_update_inode(trans, root, dentry->d_inode);
584 dir->i_sb->s_dirt = 1;
589 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
591 struct btrfs_root *root;
592 struct btrfs_trans_handle *trans;
594 unsigned long nr = 0;
596 root = BTRFS_I(dir)->root;
597 mutex_lock(&root->fs_info->fs_mutex);
599 ret = btrfs_check_free_space(root, 1, 1);
603 trans = btrfs_start_transaction(root, 1);
605 btrfs_set_trans_block_group(trans, dir);
606 ret = btrfs_unlink_trans(trans, root, dir, dentry);
607 nr = trans->blocks_used;
609 btrfs_end_transaction(trans, root);
611 mutex_unlock(&root->fs_info->fs_mutex);
612 btrfs_btree_balance_dirty(root, nr);
613 btrfs_throttle(root);
617 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
619 struct inode *inode = dentry->d_inode;
622 struct btrfs_root *root = BTRFS_I(dir)->root;
623 struct btrfs_trans_handle *trans;
624 unsigned long nr = 0;
626 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
629 mutex_lock(&root->fs_info->fs_mutex);
630 ret = btrfs_check_free_space(root, 1, 1);
634 trans = btrfs_start_transaction(root, 1);
635 btrfs_set_trans_block_group(trans, dir);
637 /* now the directory is empty */
638 err = btrfs_unlink_trans(trans, root, dir, dentry);
643 nr = trans->blocks_used;
644 ret = btrfs_end_transaction(trans, root);
646 mutex_unlock(&root->fs_info->fs_mutex);
647 btrfs_btree_balance_dirty(root, nr);
648 btrfs_throttle(root);
655 static int btrfs_free_inode(struct btrfs_trans_handle *trans,
656 struct btrfs_root *root,
659 struct btrfs_path *path;
664 path = btrfs_alloc_path();
666 ret = btrfs_lookup_inode(trans, root, path,
667 &BTRFS_I(inode)->location, -1);
671 ret = btrfs_del_item(trans, root, path);
672 btrfs_free_path(path);
677 * this can truncate away extent items, csum items and directory items.
678 * It starts at a high offset and removes keys until it can't find
679 * any higher than i_size.
681 * csum items that cross the new i_size are truncated to the new size
684 static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
685 struct btrfs_root *root,
689 struct btrfs_path *path;
690 struct btrfs_key key;
691 struct btrfs_key found_key;
693 struct extent_buffer *leaf;
694 struct btrfs_file_extent_item *fi;
695 u64 extent_start = 0;
696 u64 extent_num_bytes = 0;
702 int extent_type = -1;
704 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
705 path = btrfs_alloc_path();
709 /* FIXME, add redo link to tree so we don't leak on crash */
710 key.objectid = inode->i_ino;
711 key.offset = (u64)-1;
715 btrfs_init_path(path);
717 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
722 BUG_ON(path->slots[0] == 0);
725 leaf = path->nodes[0];
726 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
727 found_type = btrfs_key_type(&found_key);
729 if (found_key.objectid != inode->i_ino)
732 if (found_type != BTRFS_CSUM_ITEM_KEY &&
733 found_type != BTRFS_DIR_ITEM_KEY &&
734 found_type != BTRFS_DIR_INDEX_KEY &&
735 found_type != BTRFS_EXTENT_DATA_KEY)
738 item_end = found_key.offset;
739 if (found_type == BTRFS_EXTENT_DATA_KEY) {
740 fi = btrfs_item_ptr(leaf, path->slots[0],
741 struct btrfs_file_extent_item);
742 extent_type = btrfs_file_extent_type(leaf, fi);
743 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
745 btrfs_file_extent_num_bytes(leaf, fi);
746 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
747 struct btrfs_item *item = btrfs_item_nr(leaf,
749 item_end += btrfs_file_extent_inline_len(leaf,
754 if (found_type == BTRFS_CSUM_ITEM_KEY) {
755 ret = btrfs_csum_truncate(trans, root, path,
759 if (item_end < inode->i_size) {
760 if (found_type == BTRFS_DIR_ITEM_KEY) {
761 found_type = BTRFS_INODE_ITEM_KEY;
762 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
763 found_type = BTRFS_CSUM_ITEM_KEY;
764 } else if (found_type) {
769 btrfs_set_key_type(&key, found_type);
770 btrfs_release_path(root, path);
773 if (found_key.offset >= inode->i_size)
779 /* FIXME, shrink the extent if the ref count is only 1 */
780 if (found_type != BTRFS_EXTENT_DATA_KEY)
783 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
785 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
788 btrfs_file_extent_num_bytes(leaf, fi);
789 extent_num_bytes = inode->i_size -
790 found_key.offset + root->sectorsize - 1;
791 btrfs_set_file_extent_num_bytes(leaf, fi,
793 num_dec = (orig_num_bytes -
794 extent_num_bytes) >> 9;
795 if (extent_start != 0) {
796 inode->i_blocks -= num_dec;
798 btrfs_mark_buffer_dirty(leaf);
801 btrfs_file_extent_disk_num_bytes(leaf,
803 /* FIXME blocksize != 4096 */
804 num_dec = btrfs_file_extent_num_bytes(leaf,
806 if (extent_start != 0) {
808 inode->i_blocks -= num_dec;
810 root_gen = btrfs_header_generation(leaf);
811 root_owner = btrfs_header_owner(leaf);
813 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE &&
815 u32 newsize = inode->i_size - found_key.offset;
816 newsize = btrfs_file_extent_calc_inline_size(newsize);
817 ret = btrfs_truncate_item(trans, root, path,
823 ret = btrfs_del_item(trans, root, path);
829 btrfs_release_path(root, path);
831 ret = btrfs_free_extent(trans, root, extent_start,
834 root_gen, inode->i_ino,
835 found_key.offset, 0);
841 btrfs_release_path(root, path);
842 btrfs_free_path(path);
843 inode->i_sb->s_dirt = 1;
847 static int btrfs_cow_one_page(struct inode *inode, struct page *page,
851 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
852 struct btrfs_root *root = BTRFS_I(inode)->root;
853 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
854 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
855 u64 existing_delalloc;
859 WARN_ON(!PageLocked(page));
860 set_page_extent_mapped(page);
862 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
863 delalloc_start = page_start;
864 existing_delalloc = count_range_bits(&BTRFS_I(inode)->extent_tree,
865 &delalloc_start, page_end,
866 PAGE_CACHE_SIZE, EXTENT_DELALLOC);
867 set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start,
870 spin_lock(&root->fs_info->delalloc_lock);
871 root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE - existing_delalloc;
872 spin_unlock(&root->fs_info->delalloc_lock);
874 if (zero_start != PAGE_CACHE_SIZE) {
876 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
877 flush_dcache_page(page);
880 set_page_dirty(page);
881 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
887 * taken from block_truncate_page, but does cow as it zeros out
888 * any bytes left in the last page in the file.
890 static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
892 struct inode *inode = mapping->host;
893 struct btrfs_root *root = BTRFS_I(inode)->root;
894 u32 blocksize = root->sectorsize;
895 pgoff_t index = from >> PAGE_CACHE_SHIFT;
896 unsigned offset = from & (PAGE_CACHE_SIZE-1);
901 if ((offset & (blocksize - 1)) == 0)
905 page = grab_cache_page(mapping, index);
908 if (!PageUptodate(page)) {
909 ret = btrfs_readpage(NULL, page);
911 if (!PageUptodate(page)) {
916 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
918 ret = btrfs_cow_one_page(inode, page, offset);
921 page_cache_release(page);
926 static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
928 struct inode *inode = dentry->d_inode;
931 err = inode_change_ok(inode, attr);
935 if (S_ISREG(inode->i_mode) &&
936 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
937 struct btrfs_trans_handle *trans;
938 struct btrfs_root *root = BTRFS_I(inode)->root;
939 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
941 u64 mask = root->sectorsize - 1;
942 u64 pos = (inode->i_size + mask) & ~mask;
943 u64 block_end = attr->ia_size | mask;
947 if (attr->ia_size <= pos)
950 mutex_lock(&root->fs_info->fs_mutex);
951 err = btrfs_check_free_space(root, 1, 0);
952 mutex_unlock(&root->fs_info->fs_mutex);
956 btrfs_truncate_page(inode->i_mapping, inode->i_size);
958 lock_extent(em_tree, pos, block_end, GFP_NOFS);
959 hole_size = (attr->ia_size - pos + mask) & ~mask;
961 mutex_lock(&root->fs_info->fs_mutex);
962 trans = btrfs_start_transaction(root, 1);
963 btrfs_set_trans_block_group(trans, inode);
964 err = btrfs_drop_extents(trans, root, inode,
965 pos, pos + hole_size, pos,
968 if (alloc_hint != EXTENT_MAP_INLINE) {
969 err = btrfs_insert_file_extent(trans, root,
971 pos, 0, 0, hole_size);
973 btrfs_end_transaction(trans, root);
974 mutex_unlock(&root->fs_info->fs_mutex);
975 unlock_extent(em_tree, pos, block_end, GFP_NOFS);
980 err = inode_setattr(inode, attr);
984 void btrfs_delete_inode(struct inode *inode)
986 struct btrfs_trans_handle *trans;
987 struct btrfs_root *root = BTRFS_I(inode)->root;
991 truncate_inode_pages(&inode->i_data, 0);
992 if (is_bad_inode(inode)) {
997 mutex_lock(&root->fs_info->fs_mutex);
998 trans = btrfs_start_transaction(root, 1);
1000 btrfs_set_trans_block_group(trans, inode);
1001 ret = btrfs_truncate_in_trans(trans, root, inode);
1003 goto no_delete_lock;
1004 ret = btrfs_delete_xattrs(trans, root, inode);
1006 goto no_delete_lock;
1007 ret = btrfs_free_inode(trans, root, inode);
1009 goto no_delete_lock;
1010 nr = trans->blocks_used;
1012 btrfs_end_transaction(trans, root);
1013 mutex_unlock(&root->fs_info->fs_mutex);
1014 btrfs_btree_balance_dirty(root, nr);
1015 btrfs_throttle(root);
1019 nr = trans->blocks_used;
1020 btrfs_end_transaction(trans, root);
1021 mutex_unlock(&root->fs_info->fs_mutex);
1022 btrfs_btree_balance_dirty(root, nr);
1023 btrfs_throttle(root);
1029 * this returns the key found in the dir entry in the location pointer.
1030 * If no dir entries were found, location->objectid is 0.
1032 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1033 struct btrfs_key *location)
1035 const char *name = dentry->d_name.name;
1036 int namelen = dentry->d_name.len;
1037 struct btrfs_dir_item *di;
1038 struct btrfs_path *path;
1039 struct btrfs_root *root = BTRFS_I(dir)->root;
1042 if (namelen == 1 && strcmp(name, ".") == 0) {
1043 location->objectid = dir->i_ino;
1044 location->type = BTRFS_INODE_ITEM_KEY;
1045 location->offset = 0;
1048 path = btrfs_alloc_path();
1051 if (namelen == 2 && strcmp(name, "..") == 0) {
1052 struct btrfs_key key;
1053 struct extent_buffer *leaf;
1057 key.objectid = dir->i_ino;
1058 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1060 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1064 leaf = path->nodes[0];
1065 slot = path->slots[0];
1066 nritems = btrfs_header_nritems(leaf);
1067 if (slot >= nritems)
1070 btrfs_item_key_to_cpu(leaf, &key, slot);
1071 if (key.objectid != dir->i_ino ||
1072 key.type != BTRFS_INODE_REF_KEY) {
1075 location->objectid = key.offset;
1076 location->type = BTRFS_INODE_ITEM_KEY;
1077 location->offset = 0;
1081 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1085 if (!di || IS_ERR(di)) {
1088 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
1090 btrfs_free_path(path);
1093 location->objectid = 0;
1098 * when we hit a tree root in a directory, the btrfs part of the inode
1099 * needs to be changed to reflect the root directory of the tree root. This
1100 * is kind of like crossing a mount point.
1102 static int fixup_tree_root_location(struct btrfs_root *root,
1103 struct btrfs_key *location,
1104 struct btrfs_root **sub_root,
1105 struct dentry *dentry)
1107 struct btrfs_path *path;
1108 struct btrfs_root_item *ri;
1110 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1112 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1115 path = btrfs_alloc_path();
1117 mutex_lock(&root->fs_info->fs_mutex);
1119 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1120 dentry->d_name.name,
1121 dentry->d_name.len);
1122 if (IS_ERR(*sub_root))
1123 return PTR_ERR(*sub_root);
1125 ri = &(*sub_root)->root_item;
1126 location->objectid = btrfs_root_dirid(ri);
1127 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1128 location->offset = 0;
1130 btrfs_free_path(path);
1131 mutex_unlock(&root->fs_info->fs_mutex);
1135 static int btrfs_init_locked_inode(struct inode *inode, void *p)
1137 struct btrfs_iget_args *args = p;
1138 inode->i_ino = args->ino;
1139 BTRFS_I(inode)->root = args->root;
1140 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1141 inode->i_mapping, GFP_NOFS);
1145 static int btrfs_find_actor(struct inode *inode, void *opaque)
1147 struct btrfs_iget_args *args = opaque;
1148 return (args->ino == inode->i_ino &&
1149 args->root == BTRFS_I(inode)->root);
1152 struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1155 struct btrfs_iget_args args;
1156 args.ino = objectid;
1157 args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);
1162 return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
1165 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1166 struct btrfs_root *root)
1168 struct inode *inode;
1169 struct btrfs_iget_args args;
1170 args.ino = objectid;
1173 inode = iget5_locked(s, objectid, btrfs_find_actor,
1174 btrfs_init_locked_inode,
1179 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1180 struct nameidata *nd)
1182 struct inode * inode;
1183 struct btrfs_inode *bi = BTRFS_I(dir);
1184 struct btrfs_root *root = bi->root;
1185 struct btrfs_root *sub_root = root;
1186 struct btrfs_key location;
1189 if (dentry->d_name.len > BTRFS_NAME_LEN)
1190 return ERR_PTR(-ENAMETOOLONG);
1192 mutex_lock(&root->fs_info->fs_mutex);
1193 ret = btrfs_inode_by_name(dir, dentry, &location);
1194 mutex_unlock(&root->fs_info->fs_mutex);
1197 return ERR_PTR(ret);
1200 if (location.objectid) {
1201 ret = fixup_tree_root_location(root, &location, &sub_root,
1204 return ERR_PTR(ret);
1206 return ERR_PTR(-ENOENT);
1207 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1210 return ERR_PTR(-EACCES);
1211 if (inode->i_state & I_NEW) {
1212 /* the inode and parent dir are two different roots */
1213 if (sub_root != root) {
1215 sub_root->inode = inode;
1217 BTRFS_I(inode)->root = sub_root;
1218 memcpy(&BTRFS_I(inode)->location, &location,
1220 btrfs_read_locked_inode(inode);
1221 unlock_new_inode(inode);
1224 return d_splice_alias(inode, dentry);
1227 static unsigned char btrfs_filetype_table[] = {
1228 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1231 static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1233 struct inode *inode = filp->f_dentry->d_inode;
1234 struct btrfs_root *root = BTRFS_I(inode)->root;
1235 struct btrfs_item *item;
1236 struct btrfs_dir_item *di;
1237 struct btrfs_key key;
1238 struct btrfs_key found_key;
1239 struct btrfs_path *path;
1242 struct extent_buffer *leaf;
1245 unsigned char d_type;
1250 int key_type = BTRFS_DIR_INDEX_KEY;
1255 /* FIXME, use a real flag for deciding about the key type */
1256 if (root->fs_info->tree_root == root)
1257 key_type = BTRFS_DIR_ITEM_KEY;
1259 /* special case for "." */
1260 if (filp->f_pos == 0) {
1261 over = filldir(dirent, ".", 1,
1269 mutex_lock(&root->fs_info->fs_mutex);
1270 key.objectid = inode->i_ino;
1271 path = btrfs_alloc_path();
1274 /* special case for .., just use the back ref */
1275 if (filp->f_pos == 1) {
1276 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1278 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1280 leaf = path->nodes[0];
1281 slot = path->slots[0];
1282 nritems = btrfs_header_nritems(leaf);
1283 if (slot >= nritems) {
1284 btrfs_release_path(root, path);
1285 goto read_dir_items;
1287 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1288 btrfs_release_path(root, path);
1289 if (found_key.objectid != key.objectid ||
1290 found_key.type != BTRFS_INODE_REF_KEY)
1291 goto read_dir_items;
1292 over = filldir(dirent, "..", 2,
1293 2, found_key.offset, DT_DIR);
1300 btrfs_set_key_type(&key, key_type);
1301 key.offset = filp->f_pos;
1303 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1308 leaf = path->nodes[0];
1309 nritems = btrfs_header_nritems(leaf);
1310 slot = path->slots[0];
1311 if (advance || slot >= nritems) {
1312 if (slot >= nritems -1) {
1313 ret = btrfs_next_leaf(root, path);
1316 leaf = path->nodes[0];
1317 nritems = btrfs_header_nritems(leaf);
1318 slot = path->slots[0];
1325 item = btrfs_item_nr(leaf, slot);
1326 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1328 if (found_key.objectid != key.objectid)
1330 if (btrfs_key_type(&found_key) != key_type)
1332 if (found_key.offset < filp->f_pos)
1335 filp->f_pos = found_key.offset;
1337 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1339 di_total = btrfs_item_size(leaf, item);
1340 while(di_cur < di_total) {
1341 struct btrfs_key location;
1343 name_len = btrfs_dir_name_len(leaf, di);
1344 if (name_len < 32) {
1345 name_ptr = tmp_name;
1347 name_ptr = kmalloc(name_len, GFP_NOFS);
1350 read_extent_buffer(leaf, name_ptr,
1351 (unsigned long)(di + 1), name_len);
1353 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1354 btrfs_dir_item_key_to_cpu(leaf, di, &location);
1355 over = filldir(dirent, name_ptr, name_len,
1360 if (name_ptr != tmp_name)
1365 di_len = btrfs_dir_name_len(leaf, di) +
1366 btrfs_dir_data_len(leaf, di) +sizeof(*di);
1368 di = (struct btrfs_dir_item *)((char *)di + di_len);
1375 btrfs_release_path(root, path);
1376 btrfs_free_path(path);
1377 mutex_unlock(&root->fs_info->fs_mutex);
1381 int btrfs_write_inode(struct inode *inode, int wait)
1383 struct btrfs_root *root = BTRFS_I(inode)->root;
1384 struct btrfs_trans_handle *trans;
1388 mutex_lock(&root->fs_info->fs_mutex);
1389 trans = btrfs_start_transaction(root, 1);
1390 btrfs_set_trans_block_group(trans, inode);
1391 ret = btrfs_commit_transaction(trans, root);
1392 mutex_unlock(&root->fs_info->fs_mutex);
1398 * This is somewhat expensive, updating the tree every time the
1399 * inode changes. But, it is most likely to find the inode in cache.
1400 * FIXME, needs more benchmarking...there are no reasons other than performance
1401 * to keep or drop this code.
1403 void btrfs_dirty_inode(struct inode *inode)
1405 struct btrfs_root *root = BTRFS_I(inode)->root;
1406 struct btrfs_trans_handle *trans;
1408 mutex_lock(&root->fs_info->fs_mutex);
1409 trans = btrfs_start_transaction(root, 1);
1410 btrfs_set_trans_block_group(trans, inode);
1411 btrfs_update_inode(trans, root, inode);
1412 btrfs_end_transaction(trans, root);
1413 mutex_unlock(&root->fs_info->fs_mutex);
1416 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1417 struct btrfs_root *root,
1419 struct btrfs_block_group_cache *group,
1422 struct inode *inode;
1423 struct btrfs_inode_item *inode_item;
1424 struct btrfs_key *location;
1425 struct btrfs_path *path;
1429 path = btrfs_alloc_path();
1432 inode = new_inode(root->fs_info->sb);
1434 return ERR_PTR(-ENOMEM);
1436 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1437 inode->i_mapping, GFP_NOFS);
1438 BTRFS_I(inode)->root = root;
1444 group = btrfs_find_block_group(root, group, 0, 0, owner);
1445 BTRFS_I(inode)->block_group = group;
1447 ret = btrfs_insert_empty_inode(trans, root, path, objectid);
1451 inode->i_uid = current->fsuid;
1452 inode->i_gid = current->fsgid;
1453 inode->i_mode = mode;
1454 inode->i_ino = objectid;
1455 inode->i_blocks = 0;
1456 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1457 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1458 struct btrfs_inode_item);
1459 fill_inode_item(path->nodes[0], inode_item, inode);
1460 btrfs_mark_buffer_dirty(path->nodes[0]);
1461 btrfs_free_path(path);
1463 location = &BTRFS_I(inode)->location;
1464 location->objectid = objectid;
1465 location->offset = 0;
1466 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1468 insert_inode_hash(inode);
1471 btrfs_free_path(path);
1472 return ERR_PTR(ret);
1475 static inline u8 btrfs_inode_type(struct inode *inode)
1477 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1480 static int btrfs_add_link(struct btrfs_trans_handle *trans,
1481 struct dentry *dentry, struct inode *inode)
1484 struct btrfs_key key;
1485 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
1486 struct inode *parent_inode;
1488 key.objectid = inode->i_ino;
1489 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1492 ret = btrfs_insert_dir_item(trans, root,
1493 dentry->d_name.name, dentry->d_name.len,
1494 dentry->d_parent->d_inode->i_ino,
1495 &key, btrfs_inode_type(inode));
1497 ret = btrfs_insert_inode_ref(trans, root,
1498 dentry->d_name.name,
1501 dentry->d_parent->d_inode->i_ino);
1502 parent_inode = dentry->d_parent->d_inode;
1503 parent_inode->i_size += dentry->d_name.len * 2;
1504 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
1505 ret = btrfs_update_inode(trans, root,
1506 dentry->d_parent->d_inode);
1511 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1512 struct dentry *dentry, struct inode *inode)
1514 int err = btrfs_add_link(trans, dentry, inode);
1516 d_instantiate(dentry, inode);
1524 static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1525 int mode, dev_t rdev)
1527 struct btrfs_trans_handle *trans;
1528 struct btrfs_root *root = BTRFS_I(dir)->root;
1529 struct inode *inode = NULL;
1533 unsigned long nr = 0;
1535 if (!new_valid_dev(rdev))
1538 mutex_lock(&root->fs_info->fs_mutex);
1539 err = btrfs_check_free_space(root, 1, 0);
1543 trans = btrfs_start_transaction(root, 1);
1544 btrfs_set_trans_block_group(trans, dir);
1546 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1552 inode = btrfs_new_inode(trans, root, objectid,
1553 BTRFS_I(dir)->block_group, mode);
1554 err = PTR_ERR(inode);
1558 btrfs_set_trans_block_group(trans, inode);
1559 err = btrfs_add_nondir(trans, dentry, inode);
1563 inode->i_op = &btrfs_special_inode_operations;
1564 init_special_inode(inode, inode->i_mode, rdev);
1565 btrfs_update_inode(trans, root, inode);
1567 dir->i_sb->s_dirt = 1;
1568 btrfs_update_inode_block_group(trans, inode);
1569 btrfs_update_inode_block_group(trans, dir);
1571 nr = trans->blocks_used;
1572 btrfs_end_transaction(trans, root);
1574 mutex_unlock(&root->fs_info->fs_mutex);
1577 inode_dec_link_count(inode);
1580 btrfs_btree_balance_dirty(root, nr);
1581 btrfs_throttle(root);
1585 static int btrfs_create(struct inode *dir, struct dentry *dentry,
1586 int mode, struct nameidata *nd)
1588 struct btrfs_trans_handle *trans;
1589 struct btrfs_root *root = BTRFS_I(dir)->root;
1590 struct inode *inode = NULL;
1593 unsigned long nr = 0;
1596 mutex_lock(&root->fs_info->fs_mutex);
1597 err = btrfs_check_free_space(root, 1, 0);
1600 trans = btrfs_start_transaction(root, 1);
1601 btrfs_set_trans_block_group(trans, dir);
1603 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1609 inode = btrfs_new_inode(trans, root, objectid,
1610 BTRFS_I(dir)->block_group, mode);
1611 err = PTR_ERR(inode);
1615 btrfs_set_trans_block_group(trans, inode);
1616 err = btrfs_add_nondir(trans, dentry, inode);
1620 inode->i_mapping->a_ops = &btrfs_aops;
1621 inode->i_fop = &btrfs_file_operations;
1622 inode->i_op = &btrfs_file_inode_operations;
1623 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1624 inode->i_mapping, GFP_NOFS);
1625 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
1627 dir->i_sb->s_dirt = 1;
1628 btrfs_update_inode_block_group(trans, inode);
1629 btrfs_update_inode_block_group(trans, dir);
1631 nr = trans->blocks_used;
1632 btrfs_end_transaction(trans, root);
1634 mutex_unlock(&root->fs_info->fs_mutex);
1637 inode_dec_link_count(inode);
1640 btrfs_btree_balance_dirty(root, nr);
1641 btrfs_throttle(root);
1645 static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1646 struct dentry *dentry)
1648 struct btrfs_trans_handle *trans;
1649 struct btrfs_root *root = BTRFS_I(dir)->root;
1650 struct inode *inode = old_dentry->d_inode;
1651 unsigned long nr = 0;
1655 if (inode->i_nlink == 0)
1658 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1663 mutex_lock(&root->fs_info->fs_mutex);
1664 err = btrfs_check_free_space(root, 1, 0);
1667 trans = btrfs_start_transaction(root, 1);
1669 btrfs_set_trans_block_group(trans, dir);
1670 atomic_inc(&inode->i_count);
1671 err = btrfs_add_nondir(trans, dentry, inode);
1676 dir->i_sb->s_dirt = 1;
1677 btrfs_update_inode_block_group(trans, dir);
1678 err = btrfs_update_inode(trans, root, inode);
1683 nr = trans->blocks_used;
1684 btrfs_end_transaction(trans, root);
1686 mutex_unlock(&root->fs_info->fs_mutex);
1689 inode_dec_link_count(inode);
1692 btrfs_btree_balance_dirty(root, nr);
1693 btrfs_throttle(root);
1697 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1699 struct inode *inode;
1700 struct btrfs_trans_handle *trans;
1701 struct btrfs_root *root = BTRFS_I(dir)->root;
1703 int drop_on_err = 0;
1705 unsigned long nr = 1;
1707 mutex_lock(&root->fs_info->fs_mutex);
1708 err = btrfs_check_free_space(root, 1, 0);
1712 trans = btrfs_start_transaction(root, 1);
1713 btrfs_set_trans_block_group(trans, dir);
1715 if (IS_ERR(trans)) {
1716 err = PTR_ERR(trans);
1720 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1726 inode = btrfs_new_inode(trans, root, objectid,
1727 BTRFS_I(dir)->block_group, S_IFDIR | mode);
1728 if (IS_ERR(inode)) {
1729 err = PTR_ERR(inode);
1734 inode->i_op = &btrfs_dir_inode_operations;
1735 inode->i_fop = &btrfs_dir_file_operations;
1736 btrfs_set_trans_block_group(trans, inode);
1739 err = btrfs_update_inode(trans, root, inode);
1743 err = btrfs_add_link(trans, dentry, inode);
1747 d_instantiate(dentry, inode);
1749 dir->i_sb->s_dirt = 1;
1750 btrfs_update_inode_block_group(trans, inode);
1751 btrfs_update_inode_block_group(trans, dir);
1754 nr = trans->blocks_used;
1755 btrfs_end_transaction(trans, root);
1758 mutex_unlock(&root->fs_info->fs_mutex);
1761 btrfs_btree_balance_dirty(root, nr);
1762 btrfs_throttle(root);
1766 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1767 size_t page_offset, u64 start, u64 end,
1773 u64 extent_start = 0;
1775 u64 objectid = inode->i_ino;
1777 int failed_insert = 0;
1778 struct btrfs_path *path;
1779 struct btrfs_root *root = BTRFS_I(inode)->root;
1780 struct btrfs_file_extent_item *item;
1781 struct extent_buffer *leaf;
1782 struct btrfs_key found_key;
1783 struct extent_map *em = NULL;
1784 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1785 struct btrfs_trans_handle *trans = NULL;
1787 path = btrfs_alloc_path();
1789 mutex_lock(&root->fs_info->fs_mutex);
1792 em = lookup_extent_mapping(em_tree, start, end);
1794 if (em->start > start) {
1795 printk("get_extent start %Lu em start %Lu\n",
1802 em = alloc_extent_map(GFP_NOFS);
1807 em->start = EXTENT_MAP_HOLE;
1808 em->end = EXTENT_MAP_HOLE;
1810 em->bdev = inode->i_sb->s_bdev;
1811 ret = btrfs_lookup_file_extent(trans, root, path,
1812 objectid, start, trans != NULL);
1819 if (path->slots[0] == 0)
1824 leaf = path->nodes[0];
1825 item = btrfs_item_ptr(leaf, path->slots[0],
1826 struct btrfs_file_extent_item);
1827 /* are we inside the extent that was found? */
1828 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1829 found_type = btrfs_key_type(&found_key);
1830 if (found_key.objectid != objectid ||
1831 found_type != BTRFS_EXTENT_DATA_KEY) {
1835 found_type = btrfs_file_extent_type(leaf, item);
1836 extent_start = found_key.offset;
1837 if (found_type == BTRFS_FILE_EXTENT_REG) {
1838 extent_end = extent_start +
1839 btrfs_file_extent_num_bytes(leaf, item);
1841 if (start < extent_start || start >= extent_end) {
1843 if (start < extent_start) {
1844 if (end < extent_start)
1846 em->end = extent_end - 1;
1852 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
1854 em->start = extent_start;
1855 em->end = extent_end - 1;
1856 em->block_start = EXTENT_MAP_HOLE;
1857 em->block_end = EXTENT_MAP_HOLE;
1860 bytenr += btrfs_file_extent_offset(leaf, item);
1861 em->block_start = bytenr;
1862 em->block_end = em->block_start +
1863 btrfs_file_extent_num_bytes(leaf, item) - 1;
1864 em->start = extent_start;
1865 em->end = extent_end - 1;
1867 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
1871 size_t extent_offset;
1874 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
1876 extent_end = (extent_start + size - 1) |
1877 ((u64)root->sectorsize - 1);
1878 if (start < extent_start || start >= extent_end) {
1880 if (start < extent_start) {
1881 if (end < extent_start)
1883 em->end = extent_end;
1889 em->block_start = EXTENT_MAP_INLINE;
1890 em->block_end = EXTENT_MAP_INLINE;
1893 em->start = extent_start;
1894 em->end = extent_start + size - 1;
1898 extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) -
1899 extent_start + page_offset;
1900 copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset,
1901 size - extent_offset);
1902 em->start = extent_start + extent_offset;
1903 em->end = (em->start + copy_size -1) |
1904 ((u64)root->sectorsize -1);
1906 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
1907 if (create == 0 && !PageUptodate(page)) {
1908 read_extent_buffer(leaf, map + page_offset, ptr,
1910 flush_dcache_page(page);
1911 } else if (create && PageUptodate(page)) {
1914 free_extent_map(em);
1916 btrfs_release_path(root, path);
1917 trans = btrfs_start_transaction(root, 1);
1920 write_extent_buffer(leaf, map + page_offset, ptr,
1922 btrfs_mark_buffer_dirty(leaf);
1925 set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS);
1928 printk("unkknown found_type %d\n", found_type);
1935 em->block_start = EXTENT_MAP_HOLE;
1936 em->block_end = EXTENT_MAP_HOLE;
1938 btrfs_release_path(root, path);
1939 if (em->start > start || em->end < start) {
1940 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end);
1944 ret = add_extent_mapping(em_tree, em);
1945 if (ret == -EEXIST) {
1946 free_extent_map(em);
1948 if (0 && failed_insert == 1) {
1949 btrfs_drop_extent_cache(inode, start, end);
1952 if (failed_insert > 5) {
1953 printk("failing to insert %Lu %Lu\n", start, end);
1961 btrfs_free_path(path);
1963 ret = btrfs_end_transaction(trans, root);
1967 mutex_unlock(&root->fs_info->fs_mutex);
1969 free_extent_map(em);
1971 return ERR_PTR(err);
1976 static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
1978 return extent_bmap(mapping, iblock, btrfs_get_extent);
1981 int btrfs_readpage(struct file *file, struct page *page)
1983 struct extent_map_tree *tree;
1984 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1985 return extent_read_full_page(tree, page, btrfs_get_extent);
1988 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
1990 struct extent_map_tree *tree;
1993 if (current->flags & PF_MEMALLOC) {
1994 redirty_page_for_writepage(wbc, page);
1998 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1999 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
2002 static int btrfs_writepages(struct address_space *mapping,
2003 struct writeback_control *wbc)
2005 struct extent_map_tree *tree;
2006 tree = &BTRFS_I(mapping->host)->extent_tree;
2007 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2011 btrfs_readpages(struct file *file, struct address_space *mapping,
2012 struct list_head *pages, unsigned nr_pages)
2014 struct extent_map_tree *tree;
2015 tree = &BTRFS_I(mapping->host)->extent_tree;
2016 return extent_readpages(tree, mapping, pages, nr_pages,
2020 static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
2022 struct extent_map_tree *tree;
2025 tree = &BTRFS_I(page->mapping->host)->extent_tree;
2026 ret = try_release_extent_mapping(tree, page);
2028 ClearPagePrivate(page);
2029 set_page_private(page, 0);
2030 page_cache_release(page);
2035 static void btrfs_invalidatepage(struct page *page, unsigned long offset)
2037 struct extent_map_tree *tree;
2039 tree = &BTRFS_I(page->mapping->host)->extent_tree;
2040 extent_invalidatepage(tree, page, offset);
2041 btrfs_releasepage(page, GFP_NOFS);
2045 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2046 * called from a page fault handler when a page is first dirtied. Hence we must
2047 * be careful to check for EOF conditions here. We set the page up correctly
2048 * for a written page which means we get ENOSPC checking when writing into
2049 * holes and correct delalloc and unwritten extent mapping on filesystems that
2050 * support these features.
2052 * We are not allowed to take the i_mutex here so we have to play games to
2053 * protect against truncate races as the page could now be beyond EOF. Because
2054 * vmtruncate() writes the inode size before removing pages, once we have the
2055 * page lock we can determine safely if the page is beyond EOF. If it is not
2056 * beyond EOF, then the page is guaranteed safe against truncation until we
2059 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2061 struct inode *inode = fdentry(vma->vm_file)->d_inode;
2062 struct btrfs_root *root = BTRFS_I(inode)->root;
2068 mutex_lock(&root->fs_info->fs_mutex);
2069 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
2070 mutex_unlock(&root->fs_info->fs_mutex);
2077 wait_on_page_writeback(page);
2078 size = i_size_read(inode);
2079 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2081 if ((page->mapping != inode->i_mapping) ||
2082 (page_start > size)) {
2083 /* page got truncated out from underneath us */
2087 /* page is wholly or partially inside EOF */
2088 if (page_start + PAGE_CACHE_SIZE > size)
2089 end = size & ~PAGE_CACHE_MASK;
2091 end = PAGE_CACHE_SIZE;
2093 ret = btrfs_cow_one_page(inode, page, end);
2101 static void btrfs_truncate(struct inode *inode)
2103 struct btrfs_root *root = BTRFS_I(inode)->root;
2105 struct btrfs_trans_handle *trans;
2108 if (!S_ISREG(inode->i_mode))
2110 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2113 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2115 mutex_lock(&root->fs_info->fs_mutex);
2116 trans = btrfs_start_transaction(root, 1);
2117 btrfs_set_trans_block_group(trans, inode);
2119 /* FIXME, add redo link to tree so we don't leak on crash */
2120 ret = btrfs_truncate_in_trans(trans, root, inode);
2121 btrfs_update_inode(trans, root, inode);
2122 nr = trans->blocks_used;
2124 ret = btrfs_end_transaction(trans, root);
2126 mutex_unlock(&root->fs_info->fs_mutex);
2127 btrfs_btree_balance_dirty(root, nr);
2128 btrfs_throttle(root);
2131 static int noinline create_subvol(struct btrfs_root *root, char *name,
2134 struct btrfs_trans_handle *trans;
2135 struct btrfs_key key;
2136 struct btrfs_root_item root_item;
2137 struct btrfs_inode_item *inode_item;
2138 struct extent_buffer *leaf;
2139 struct btrfs_root *new_root = root;
2140 struct inode *inode;
2145 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
2146 unsigned long nr = 1;
2148 mutex_lock(&root->fs_info->fs_mutex);
2149 ret = btrfs_check_free_space(root, 1, 0);
2153 trans = btrfs_start_transaction(root, 1);
2156 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2161 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2162 objectid, trans->transid, 0, 0,
2165 return PTR_ERR(leaf);
2167 btrfs_set_header_nritems(leaf, 0);
2168 btrfs_set_header_level(leaf, 0);
2169 btrfs_set_header_bytenr(leaf, leaf->start);
2170 btrfs_set_header_generation(leaf, trans->transid);
2171 btrfs_set_header_owner(leaf, objectid);
2173 write_extent_buffer(leaf, root->fs_info->fsid,
2174 (unsigned long)btrfs_header_fsid(leaf),
2176 btrfs_mark_buffer_dirty(leaf);
2178 inode_item = &root_item.inode;
2179 memset(inode_item, 0, sizeof(*inode_item));
2180 inode_item->generation = cpu_to_le64(1);
2181 inode_item->size = cpu_to_le64(3);
2182 inode_item->nlink = cpu_to_le32(1);
2183 inode_item->nblocks = cpu_to_le64(1);
2184 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
2186 btrfs_set_root_bytenr(&root_item, leaf->start);
2187 btrfs_set_root_level(&root_item, 0);
2188 btrfs_set_root_refs(&root_item, 1);
2189 btrfs_set_root_used(&root_item, 0);
2191 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2192 root_item.drop_level = 0;
2194 free_extent_buffer(leaf);
2197 btrfs_set_root_dirid(&root_item, new_dirid);
2199 key.objectid = objectid;
2201 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2202 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2208 * insert the directory item
2210 key.offset = (u64)-1;
2211 dir = root->fs_info->sb->s_root->d_inode;
2212 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2213 name, namelen, dir->i_ino, &key,
2218 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2219 name, namelen, objectid,
2220 root->fs_info->sb->s_root->d_inode->i_ino);
2224 ret = btrfs_commit_transaction(trans, root);
2228 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
2231 trans = btrfs_start_transaction(new_root, 1);
2234 inode = btrfs_new_inode(trans, new_root, new_dirid,
2235 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
2238 inode->i_op = &btrfs_dir_inode_operations;
2239 inode->i_fop = &btrfs_dir_file_operations;
2240 new_root->inode = inode;
2242 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2246 ret = btrfs_update_inode(trans, new_root, inode);
2250 nr = trans->blocks_used;
2251 err = btrfs_commit_transaction(trans, new_root);
2255 mutex_unlock(&root->fs_info->fs_mutex);
2256 btrfs_btree_balance_dirty(root, nr);
2257 btrfs_throttle(root);
2261 static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2263 struct btrfs_pending_snapshot *pending_snapshot;
2264 struct btrfs_trans_handle *trans;
2267 unsigned long nr = 0;
2269 if (!root->ref_cows)
2272 mutex_lock(&root->fs_info->fs_mutex);
2273 ret = btrfs_check_free_space(root, 1, 0);
2277 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
2278 if (!pending_snapshot) {
2282 pending_snapshot->name = kstrndup(name, namelen, GFP_NOFS);
2283 if (!pending_snapshot->name) {
2285 kfree(pending_snapshot);
2288 trans = btrfs_start_transaction(root, 1);
2291 pending_snapshot->root = root;
2292 list_add(&pending_snapshot->list,
2293 &trans->transaction->pending_snapshots);
2294 ret = btrfs_update_inode(trans, root, root->inode);
2295 err = btrfs_commit_transaction(trans, root);
2298 mutex_unlock(&root->fs_info->fs_mutex);
2299 btrfs_btree_balance_dirty(root, nr);
2300 btrfs_throttle(root);
2304 unsigned long btrfs_force_ra(struct address_space *mapping,
2305 struct file_ra_state *ra, struct file *file,
2306 pgoff_t offset, pgoff_t last_index)
2310 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2311 req_size = last_index - offset + 1;
2312 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2315 req_size = min(last_index - offset + 1, (pgoff_t)128);
2316 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2317 return offset + req_size;
2321 int btrfs_defrag_file(struct file *file) {
2322 struct inode *inode = fdentry(file)->d_inode;
2323 struct btrfs_root *root = BTRFS_I(inode)->root;
2324 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
2326 unsigned long last_index;
2327 unsigned long ra_index = 0;
2331 u64 existing_delalloc;
2335 mutex_lock(&root->fs_info->fs_mutex);
2336 ret = btrfs_check_free_space(root, inode->i_size, 0);
2337 mutex_unlock(&root->fs_info->fs_mutex);
2341 mutex_lock(&inode->i_mutex);
2342 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2343 for (i = 0; i <= last_index; i++) {
2344 if (i == ra_index) {
2345 ra_index = btrfs_force_ra(inode->i_mapping,
2347 file, ra_index, last_index);
2349 page = grab_cache_page(inode->i_mapping, i);
2352 if (!PageUptodate(page)) {
2353 btrfs_readpage(NULL, page);
2355 if (!PageUptodate(page)) {
2357 page_cache_release(page);
2361 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2362 page_end = page_start + PAGE_CACHE_SIZE - 1;
2364 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
2365 delalloc_start = page_start;
2367 count_range_bits(&BTRFS_I(inode)->extent_tree,
2368 &delalloc_start, page_end,
2369 PAGE_CACHE_SIZE, EXTENT_DELALLOC);
2370 set_extent_delalloc(em_tree, page_start,
2371 page_end, GFP_NOFS);
2373 spin_lock(&root->fs_info->delalloc_lock);
2374 root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE -
2376 spin_unlock(&root->fs_info->delalloc_lock);
2378 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
2379 set_page_dirty(page);
2381 page_cache_release(page);
2382 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2386 mutex_unlock(&inode->i_mutex);
2390 static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2394 struct btrfs_ioctl_vol_args *vol_args;
2395 struct btrfs_trans_handle *trans;
2401 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2406 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2410 namelen = strlen(vol_args->name);
2411 if (namelen > BTRFS_VOL_NAME_MAX) {
2416 sizestr = vol_args->name;
2417 if (!strcmp(sizestr, "max"))
2418 new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
2420 if (sizestr[0] == '-') {
2423 } else if (sizestr[0] == '+') {
2427 new_size = btrfs_parse_size(sizestr);
2428 if (new_size == 0) {
2434 mutex_lock(&root->fs_info->fs_mutex);
2435 old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);
2438 if (new_size > old_size) {
2442 new_size = old_size - new_size;
2443 } else if (mod > 0) {
2444 new_size = old_size + new_size;
2447 if (new_size < 256 * 1024 * 1024) {
2451 if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
2456 do_div(new_size, root->sectorsize);
2457 new_size *= root->sectorsize;
2459 printk("new size is %Lu\n", new_size);
2460 if (new_size > old_size) {
2461 trans = btrfs_start_transaction(root, 1);
2462 ret = btrfs_grow_extent_tree(trans, root, new_size);
2463 btrfs_commit_transaction(trans, root);
2465 ret = btrfs_shrink_extent_tree(root, new_size);
2469 mutex_unlock(&root->fs_info->fs_mutex);
2475 static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
2478 struct btrfs_ioctl_vol_args *vol_args;
2479 struct btrfs_dir_item *di;
2480 struct btrfs_path *path;
2485 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2490 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2495 namelen = strlen(vol_args->name);
2496 if (namelen > BTRFS_VOL_NAME_MAX) {
2500 if (strchr(vol_args->name, '/')) {
2505 path = btrfs_alloc_path();
2511 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2512 mutex_lock(&root->fs_info->fs_mutex);
2513 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2515 vol_args->name, namelen, 0);
2516 mutex_unlock(&root->fs_info->fs_mutex);
2517 btrfs_free_path(path);
2519 if (di && !IS_ERR(di)) {
2529 if (root == root->fs_info->tree_root)
2530 ret = create_subvol(root, vol_args->name, namelen);
2532 ret = create_snapshot(root, vol_args->name, namelen);
2538 static int btrfs_ioctl_defrag(struct file *file)
2540 struct inode *inode = fdentry(file)->d_inode;
2541 struct btrfs_root *root = BTRFS_I(inode)->root;
2543 switch (inode->i_mode & S_IFMT) {
2545 mutex_lock(&root->fs_info->fs_mutex);
2546 btrfs_defrag_root(root, 0);
2547 btrfs_defrag_root(root->fs_info->extent_root, 0);
2548 mutex_unlock(&root->fs_info->fs_mutex);
2551 btrfs_defrag_file(file);
2558 long btrfs_ioctl(struct file *file, unsigned int
2559 cmd, unsigned long arg)
2561 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
2564 case BTRFS_IOC_SNAP_CREATE:
2565 return btrfs_ioctl_snap_create(root, (void __user *)arg);
2566 case BTRFS_IOC_DEFRAG:
2567 return btrfs_ioctl_defrag(file);
2568 case BTRFS_IOC_RESIZE:
2569 return btrfs_ioctl_resize(root, (void __user *)arg);
2576 * Called inside transaction, so use GFP_NOFS
2578 struct inode *btrfs_alloc_inode(struct super_block *sb)
2580 struct btrfs_inode *ei;
2582 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2586 ei->ordered_trans = 0;
2587 return &ei->vfs_inode;
2590 void btrfs_destroy_inode(struct inode *inode)
2592 WARN_ON(!list_empty(&inode->i_dentry));
2593 WARN_ON(inode->i_data.nrpages);
2595 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2598 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2599 static void init_once(struct kmem_cache * cachep, void *foo)
2601 static void init_once(void * foo, struct kmem_cache * cachep,
2602 unsigned long flags)
2605 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2607 inode_init_once(&ei->vfs_inode);
2610 void btrfs_destroy_cachep(void)
2612 if (btrfs_inode_cachep)
2613 kmem_cache_destroy(btrfs_inode_cachep);
2614 if (btrfs_trans_handle_cachep)
2615 kmem_cache_destroy(btrfs_trans_handle_cachep);
2616 if (btrfs_transaction_cachep)
2617 kmem_cache_destroy(btrfs_transaction_cachep);
2618 if (btrfs_bit_radix_cachep)
2619 kmem_cache_destroy(btrfs_bit_radix_cachep);
2620 if (btrfs_path_cachep)
2621 kmem_cache_destroy(btrfs_path_cachep);
2624 struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
2625 unsigned long extra_flags,
2626 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2627 void (*ctor)(struct kmem_cache *, void *)
2629 void (*ctor)(void *, struct kmem_cache *,
2634 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2635 SLAB_MEM_SPREAD | extra_flags), ctor
2636 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2642 int btrfs_init_cachep(void)
2644 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
2645 sizeof(struct btrfs_inode),
2647 if (!btrfs_inode_cachep)
2649 btrfs_trans_handle_cachep =
2650 btrfs_cache_create("btrfs_trans_handle_cache",
2651 sizeof(struct btrfs_trans_handle),
2653 if (!btrfs_trans_handle_cachep)
2655 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
2656 sizeof(struct btrfs_transaction),
2658 if (!btrfs_transaction_cachep)
2660 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
2661 sizeof(struct btrfs_path),
2663 if (!btrfs_path_cachep)
2665 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
2666 SLAB_DESTROY_BY_RCU, NULL);
2667 if (!btrfs_bit_radix_cachep)
2671 btrfs_destroy_cachep();
2675 static int btrfs_getattr(struct vfsmount *mnt,
2676 struct dentry *dentry, struct kstat *stat)
2678 struct inode *inode = dentry->d_inode;
2679 generic_fillattr(inode, stat);
2680 stat->blksize = PAGE_CACHE_SIZE;
2684 static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
2685 struct inode * new_dir,struct dentry *new_dentry)
2687 struct btrfs_trans_handle *trans;
2688 struct btrfs_root *root = BTRFS_I(old_dir)->root;
2689 struct inode *new_inode = new_dentry->d_inode;
2690 struct inode *old_inode = old_dentry->d_inode;
2691 struct timespec ctime = CURRENT_TIME;
2692 struct btrfs_path *path;
2695 if (S_ISDIR(old_inode->i_mode) && new_inode &&
2696 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
2700 mutex_lock(&root->fs_info->fs_mutex);
2701 ret = btrfs_check_free_space(root, 1, 0);
2705 trans = btrfs_start_transaction(root, 1);
2707 btrfs_set_trans_block_group(trans, new_dir);
2708 path = btrfs_alloc_path();
2714 old_dentry->d_inode->i_nlink++;
2715 old_dir->i_ctime = old_dir->i_mtime = ctime;
2716 new_dir->i_ctime = new_dir->i_mtime = ctime;
2717 old_inode->i_ctime = ctime;
2719 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
2724 new_inode->i_ctime = CURRENT_TIME;
2725 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
2729 ret = btrfs_add_link(trans, new_dentry, old_inode);
2734 btrfs_free_path(path);
2735 btrfs_end_transaction(trans, root);
2737 mutex_unlock(&root->fs_info->fs_mutex);
2741 static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
2742 const char *symname)
2744 struct btrfs_trans_handle *trans;
2745 struct btrfs_root *root = BTRFS_I(dir)->root;
2746 struct btrfs_path *path;
2747 struct btrfs_key key;
2748 struct inode *inode = NULL;
2755 struct btrfs_file_extent_item *ei;
2756 struct extent_buffer *leaf;
2757 unsigned long nr = 0;
2759 name_len = strlen(symname) + 1;
2760 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
2761 return -ENAMETOOLONG;
2763 mutex_lock(&root->fs_info->fs_mutex);
2764 err = btrfs_check_free_space(root, 1, 0);
2768 trans = btrfs_start_transaction(root, 1);
2769 btrfs_set_trans_block_group(trans, dir);
2771 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2777 inode = btrfs_new_inode(trans, root, objectid,
2778 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
2779 err = PTR_ERR(inode);
2783 btrfs_set_trans_block_group(trans, inode);
2784 err = btrfs_add_nondir(trans, dentry, inode);
2788 inode->i_mapping->a_ops = &btrfs_aops;
2789 inode->i_fop = &btrfs_file_operations;
2790 inode->i_op = &btrfs_file_inode_operations;
2791 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
2792 inode->i_mapping, GFP_NOFS);
2793 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
2795 dir->i_sb->s_dirt = 1;
2796 btrfs_update_inode_block_group(trans, inode);
2797 btrfs_update_inode_block_group(trans, dir);
2801 path = btrfs_alloc_path();
2803 key.objectid = inode->i_ino;
2805 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2806 datasize = btrfs_file_extent_calc_inline_size(name_len);
2807 err = btrfs_insert_empty_item(trans, root, path, &key,
2813 leaf = path->nodes[0];
2814 ei = btrfs_item_ptr(leaf, path->slots[0],
2815 struct btrfs_file_extent_item);
2816 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
2817 btrfs_set_file_extent_type(leaf, ei,
2818 BTRFS_FILE_EXTENT_INLINE);
2819 ptr = btrfs_file_extent_inline_start(ei);
2820 write_extent_buffer(leaf, symname, ptr, name_len);
2821 btrfs_mark_buffer_dirty(leaf);
2822 btrfs_free_path(path);
2824 inode->i_op = &btrfs_symlink_inode_operations;
2825 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2826 inode->i_size = name_len - 1;
2827 err = btrfs_update_inode(trans, root, inode);
2832 nr = trans->blocks_used;
2833 btrfs_end_transaction(trans, root);
2835 mutex_unlock(&root->fs_info->fs_mutex);
2837 inode_dec_link_count(inode);
2840 btrfs_btree_balance_dirty(root, nr);
2841 btrfs_throttle(root);
2845 static struct inode_operations btrfs_dir_inode_operations = {
2846 .lookup = btrfs_lookup,
2847 .create = btrfs_create,
2848 .unlink = btrfs_unlink,
2850 .mkdir = btrfs_mkdir,
2851 .rmdir = btrfs_rmdir,
2852 .rename = btrfs_rename,
2853 .symlink = btrfs_symlink,
2854 .setattr = btrfs_setattr,
2855 .mknod = btrfs_mknod,
2856 .setxattr = generic_setxattr,
2857 .getxattr = generic_getxattr,
2858 .listxattr = btrfs_listxattr,
2859 .removexattr = generic_removexattr,
2862 static struct inode_operations btrfs_dir_ro_inode_operations = {
2863 .lookup = btrfs_lookup,
2866 static struct file_operations btrfs_dir_file_operations = {
2867 .llseek = generic_file_llseek,
2868 .read = generic_read_dir,
2869 .readdir = btrfs_readdir,
2870 .unlocked_ioctl = btrfs_ioctl,
2871 #ifdef CONFIG_COMPAT
2872 .compat_ioctl = btrfs_ioctl,
2876 static struct extent_map_ops btrfs_extent_map_ops = {
2877 .fill_delalloc = run_delalloc_range,
2878 .writepage_io_hook = btrfs_writepage_io_hook,
2879 .readpage_io_hook = btrfs_readpage_io_hook,
2880 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
2883 static struct address_space_operations btrfs_aops = {
2884 .readpage = btrfs_readpage,
2885 .writepage = btrfs_writepage,
2886 .writepages = btrfs_writepages,
2887 .readpages = btrfs_readpages,
2888 .sync_page = block_sync_page,
2890 .invalidatepage = btrfs_invalidatepage,
2891 .releasepage = btrfs_releasepage,
2892 .set_page_dirty = __set_page_dirty_nobuffers,
2895 static struct address_space_operations btrfs_symlink_aops = {
2896 .readpage = btrfs_readpage,
2897 .writepage = btrfs_writepage,
2898 .invalidatepage = btrfs_invalidatepage,
2899 .releasepage = btrfs_releasepage,
2902 static struct inode_operations btrfs_file_inode_operations = {
2903 .truncate = btrfs_truncate,
2904 .getattr = btrfs_getattr,
2905 .setattr = btrfs_setattr,
2906 .setxattr = generic_setxattr,
2907 .getxattr = generic_getxattr,
2908 .listxattr = btrfs_listxattr,
2909 .removexattr = generic_removexattr,
2912 static struct inode_operations btrfs_special_inode_operations = {
2913 .getattr = btrfs_getattr,
2914 .setattr = btrfs_setattr,
2917 static struct inode_operations btrfs_symlink_inode_operations = {
2918 .readlink = generic_readlink,
2919 .follow_link = page_follow_link_light,
2920 .put_link = page_put_link,