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);
84 thresh = (total * 90) / 100;
86 thresh = (total * 85) / 100;
88 spin_lock(&root->fs_info->delalloc_lock);
89 if (used + root->fs_info->delalloc_bytes + num_required > thresh)
91 spin_unlock(&root->fs_info->delalloc_lock);
95 static int cow_file_range(struct inode *inode, u64 start, u64 end)
97 struct btrfs_root *root = BTRFS_I(inode)->root;
98 struct btrfs_trans_handle *trans;
102 u64 blocksize = root->sectorsize;
103 struct btrfs_key ins;
106 trans = btrfs_start_transaction(root, 1);
108 btrfs_set_trans_block_group(trans, inode);
110 num_bytes = (end - start + blocksize) & ~(blocksize - 1);
111 num_bytes = max(blocksize, num_bytes);
112 ret = btrfs_drop_extents(trans, root, inode,
113 start, start + num_bytes, start, &alloc_hint);
115 if (alloc_hint == EXTENT_MAP_INLINE)
118 while(num_bytes > 0) {
119 cur_alloc_size = min(num_bytes, root->fs_info->max_extent);
120 ret = btrfs_alloc_extent(trans, root, cur_alloc_size,
121 root->root_key.objectid,
123 inode->i_ino, start, 0,
124 alloc_hint, (u64)-1, &ins, 1);
129 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
130 start, ins.objectid, ins.offset,
132 num_bytes -= cur_alloc_size;
133 alloc_hint = ins.objectid + ins.offset;
134 start += cur_alloc_size;
137 btrfs_end_transaction(trans, root);
141 static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end)
148 struct btrfs_root *root = BTRFS_I(inode)->root;
149 struct extent_buffer *leaf;
151 struct btrfs_path *path;
152 struct btrfs_file_extent_item *item;
155 struct btrfs_key found_key;
157 path = btrfs_alloc_path();
160 ret = btrfs_lookup_file_extent(NULL, root, path,
161 inode->i_ino, start, 0);
163 btrfs_free_path(path);
169 if (path->slots[0] == 0)
174 leaf = path->nodes[0];
175 item = btrfs_item_ptr(leaf, path->slots[0],
176 struct btrfs_file_extent_item);
178 /* are we inside the extent that was found? */
179 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
180 found_type = btrfs_key_type(&found_key);
181 if (found_key.objectid != inode->i_ino ||
182 found_type != BTRFS_EXTENT_DATA_KEY) {
186 found_type = btrfs_file_extent_type(leaf, item);
187 extent_start = found_key.offset;
188 if (found_type == BTRFS_FILE_EXTENT_REG) {
189 extent_end = extent_start +
190 btrfs_file_extent_num_bytes(leaf, item);
193 if (loops && start != extent_start)
196 if (start < extent_start || start >= extent_end)
199 cow_end = min(end, extent_end - 1);
200 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
204 if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) {
209 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
214 btrfs_free_path(path);
217 btrfs_release_path(root, path);
222 cow_file_range(inode, start, cow_end);
227 static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
229 struct btrfs_root *root = BTRFS_I(inode)->root;
233 mutex_lock(&root->fs_info->fs_mutex);
234 if (btrfs_test_opt(root, NODATACOW))
235 ret = run_delalloc_nocow(inode, start, end);
237 ret = cow_file_range(inode, start, end);
239 spin_lock(&root->fs_info->delalloc_lock);
240 num_bytes = end + 1 - start;
241 if (root->fs_info->delalloc_bytes < num_bytes) {
242 printk("delalloc accounting error total %llu sub %llu\n",
243 root->fs_info->delalloc_bytes, num_bytes);
245 root->fs_info->delalloc_bytes -= num_bytes;
247 spin_unlock(&root->fs_info->delalloc_lock);
249 mutex_unlock(&root->fs_info->fs_mutex);
253 int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end)
255 struct inode *inode = page->mapping->host;
256 struct btrfs_root *root = BTRFS_I(inode)->root;
257 struct btrfs_trans_handle *trans;
260 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
261 size_t offset = start - page_start;
263 if (btrfs_test_opt(root, NODATASUM))
266 mutex_lock(&root->fs_info->fs_mutex);
267 trans = btrfs_start_transaction(root, 1);
268 btrfs_set_trans_block_group(trans, inode);
270 btrfs_csum_file_block(trans, root, inode, inode->i_ino,
271 start, kaddr + offset, end - start + 1);
273 ret = btrfs_end_transaction(trans, root);
275 mutex_unlock(&root->fs_info->fs_mutex);
279 int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
282 struct inode *inode = page->mapping->host;
283 struct btrfs_root *root = BTRFS_I(inode)->root;
284 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
285 struct btrfs_csum_item *item;
286 struct btrfs_path *path = NULL;
289 if (btrfs_test_opt(root, NODATASUM))
292 mutex_lock(&root->fs_info->fs_mutex);
293 path = btrfs_alloc_path();
294 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
297 /* a csum that isn't present is a preallocated region. */
298 if (ret == -ENOENT || ret == -EFBIG)
303 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
305 set_state_private(em_tree, start, csum);
308 btrfs_free_path(path);
309 mutex_unlock(&root->fs_info->fs_mutex);
313 int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
315 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
316 struct inode *inode = page->mapping->host;
317 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
321 struct btrfs_root *root = BTRFS_I(inode)->root;
325 if (btrfs_test_opt(root, NODATASUM))
328 ret = get_state_private(em_tree, start, &private);
329 local_irq_save(flags);
330 kaddr = kmap_atomic(page, KM_IRQ0);
334 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
335 btrfs_csum_final(csum, (char *)&csum);
336 if (csum != private) {
339 kunmap_atomic(kaddr, KM_IRQ0);
340 local_irq_restore(flags);
344 printk("btrfs csum failed ino %lu off %llu\n",
345 page->mapping->host->i_ino, (unsigned long long)start);
346 memset(kaddr + offset, 1, end - start + 1);
347 flush_dcache_page(page);
348 kunmap_atomic(kaddr, KM_IRQ0);
349 local_irq_restore(flags);
353 void btrfs_read_locked_inode(struct inode *inode)
355 struct btrfs_path *path;
356 struct extent_buffer *leaf;
357 struct btrfs_inode_item *inode_item;
358 struct btrfs_inode_timespec *tspec;
359 struct btrfs_root *root = BTRFS_I(inode)->root;
360 struct btrfs_key location;
361 u64 alloc_group_block;
365 path = btrfs_alloc_path();
367 mutex_lock(&root->fs_info->fs_mutex);
369 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
370 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
374 leaf = path->nodes[0];
375 inode_item = btrfs_item_ptr(leaf, path->slots[0],
376 struct btrfs_inode_item);
378 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
379 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
380 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
381 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
382 inode->i_size = btrfs_inode_size(leaf, inode_item);
384 tspec = btrfs_inode_atime(inode_item);
385 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
386 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
388 tspec = btrfs_inode_mtime(inode_item);
389 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
390 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
392 tspec = btrfs_inode_ctime(inode_item);
393 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
394 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
396 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
397 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
399 rdev = btrfs_inode_rdev(leaf, inode_item);
401 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
402 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
405 btrfs_free_path(path);
408 mutex_unlock(&root->fs_info->fs_mutex);
410 switch (inode->i_mode & S_IFMT) {
412 inode->i_mapping->a_ops = &btrfs_aops;
413 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
414 inode->i_fop = &btrfs_file_operations;
415 inode->i_op = &btrfs_file_inode_operations;
418 inode->i_fop = &btrfs_dir_file_operations;
419 if (root == root->fs_info->tree_root)
420 inode->i_op = &btrfs_dir_ro_inode_operations;
422 inode->i_op = &btrfs_dir_inode_operations;
425 inode->i_op = &btrfs_symlink_inode_operations;
426 inode->i_mapping->a_ops = &btrfs_symlink_aops;
429 init_special_inode(inode, inode->i_mode, rdev);
435 btrfs_release_path(root, path);
436 btrfs_free_path(path);
437 mutex_unlock(&root->fs_info->fs_mutex);
438 make_bad_inode(inode);
441 static void fill_inode_item(struct extent_buffer *leaf,
442 struct btrfs_inode_item *item,
445 btrfs_set_inode_uid(leaf, item, inode->i_uid);
446 btrfs_set_inode_gid(leaf, item, inode->i_gid);
447 btrfs_set_inode_size(leaf, item, inode->i_size);
448 btrfs_set_inode_mode(leaf, item, inode->i_mode);
449 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
451 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
452 inode->i_atime.tv_sec);
453 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
454 inode->i_atime.tv_nsec);
456 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
457 inode->i_mtime.tv_sec);
458 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
459 inode->i_mtime.tv_nsec);
461 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
462 inode->i_ctime.tv_sec);
463 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
464 inode->i_ctime.tv_nsec);
466 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
467 btrfs_set_inode_generation(leaf, item, inode->i_generation);
468 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
469 btrfs_set_inode_block_group(leaf, item,
470 BTRFS_I(inode)->block_group->key.objectid);
473 int btrfs_update_inode(struct btrfs_trans_handle *trans,
474 struct btrfs_root *root,
477 struct btrfs_inode_item *inode_item;
478 struct btrfs_path *path;
479 struct extent_buffer *leaf;
482 path = btrfs_alloc_path();
484 ret = btrfs_lookup_inode(trans, root, path,
485 &BTRFS_I(inode)->location, 1);
492 leaf = path->nodes[0];
493 inode_item = btrfs_item_ptr(leaf, path->slots[0],
494 struct btrfs_inode_item);
496 fill_inode_item(leaf, inode_item, inode);
497 btrfs_mark_buffer_dirty(leaf);
498 btrfs_set_inode_last_trans(trans, inode);
501 btrfs_release_path(root, path);
502 btrfs_free_path(path);
507 static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
508 struct btrfs_root *root,
510 struct dentry *dentry)
512 struct btrfs_path *path;
513 const char *name = dentry->d_name.name;
514 int name_len = dentry->d_name.len;
516 struct extent_buffer *leaf;
517 struct btrfs_dir_item *di;
518 struct btrfs_key key;
520 path = btrfs_alloc_path();
526 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
536 leaf = path->nodes[0];
537 btrfs_dir_item_key_to_cpu(leaf, di, &key);
538 ret = btrfs_delete_one_dir_name(trans, root, path, di);
541 btrfs_release_path(root, path);
543 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
544 key.objectid, name, name_len, -1);
553 ret = btrfs_delete_one_dir_name(trans, root, path, di);
555 dentry->d_inode->i_ctime = dir->i_ctime;
556 ret = btrfs_del_inode_ref(trans, root, name, name_len,
557 dentry->d_inode->i_ino,
558 dentry->d_parent->d_inode->i_ino);
560 printk("failed to delete reference to %.*s, "
561 "inode %lu parent %lu\n", name_len, name,
562 dentry->d_inode->i_ino,
563 dentry->d_parent->d_inode->i_ino);
566 btrfs_free_path(path);
568 dir->i_size -= name_len * 2;
569 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
570 btrfs_update_inode(trans, root, dir);
571 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
572 dentry->d_inode->i_nlink--;
574 drop_nlink(dentry->d_inode);
576 ret = btrfs_update_inode(trans, root, dentry->d_inode);
577 dir->i_sb->s_dirt = 1;
582 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
584 struct btrfs_root *root;
585 struct btrfs_trans_handle *trans;
587 unsigned long nr = 0;
589 root = BTRFS_I(dir)->root;
590 mutex_lock(&root->fs_info->fs_mutex);
592 ret = btrfs_check_free_space(root, 1, 1);
596 trans = btrfs_start_transaction(root, 1);
598 btrfs_set_trans_block_group(trans, dir);
599 ret = btrfs_unlink_trans(trans, root, dir, dentry);
600 nr = trans->blocks_used;
602 btrfs_end_transaction(trans, root);
604 mutex_unlock(&root->fs_info->fs_mutex);
605 btrfs_btree_balance_dirty(root, nr);
609 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
611 struct inode *inode = dentry->d_inode;
614 struct btrfs_root *root = BTRFS_I(dir)->root;
615 struct btrfs_trans_handle *trans;
616 unsigned long nr = 0;
618 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
621 mutex_lock(&root->fs_info->fs_mutex);
622 ret = btrfs_check_free_space(root, 1, 1);
626 trans = btrfs_start_transaction(root, 1);
627 btrfs_set_trans_block_group(trans, dir);
629 /* now the directory is empty */
630 err = btrfs_unlink_trans(trans, root, dir, dentry);
635 nr = trans->blocks_used;
636 ret = btrfs_end_transaction(trans, root);
638 mutex_unlock(&root->fs_info->fs_mutex);
639 btrfs_btree_balance_dirty(root, nr);
646 static int btrfs_free_inode(struct btrfs_trans_handle *trans,
647 struct btrfs_root *root,
650 struct btrfs_path *path;
655 path = btrfs_alloc_path();
657 ret = btrfs_lookup_inode(trans, root, path,
658 &BTRFS_I(inode)->location, -1);
662 ret = btrfs_del_item(trans, root, path);
663 btrfs_free_path(path);
668 * this can truncate away extent items, csum items and directory items.
669 * It starts at a high offset and removes keys until it can't find
670 * any higher than i_size.
672 * csum items that cross the new i_size are truncated to the new size
675 static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
676 struct btrfs_root *root,
680 struct btrfs_path *path;
681 struct btrfs_key key;
682 struct btrfs_key found_key;
684 struct extent_buffer *leaf;
685 struct btrfs_file_extent_item *fi;
686 u64 extent_start = 0;
687 u64 extent_num_bytes = 0;
693 int extent_type = -1;
695 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
696 path = btrfs_alloc_path();
700 /* FIXME, add redo link to tree so we don't leak on crash */
701 key.objectid = inode->i_ino;
702 key.offset = (u64)-1;
706 btrfs_init_path(path);
708 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
713 BUG_ON(path->slots[0] == 0);
716 leaf = path->nodes[0];
717 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
718 found_type = btrfs_key_type(&found_key);
720 if (found_key.objectid != inode->i_ino)
723 if (found_type != BTRFS_CSUM_ITEM_KEY &&
724 found_type != BTRFS_DIR_ITEM_KEY &&
725 found_type != BTRFS_DIR_INDEX_KEY &&
726 found_type != BTRFS_EXTENT_DATA_KEY)
729 item_end = found_key.offset;
730 if (found_type == BTRFS_EXTENT_DATA_KEY) {
731 fi = btrfs_item_ptr(leaf, path->slots[0],
732 struct btrfs_file_extent_item);
733 extent_type = btrfs_file_extent_type(leaf, fi);
734 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
736 btrfs_file_extent_num_bytes(leaf, fi);
737 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
738 struct btrfs_item *item = btrfs_item_nr(leaf,
740 item_end += btrfs_file_extent_inline_len(leaf,
745 if (found_type == BTRFS_CSUM_ITEM_KEY) {
746 ret = btrfs_csum_truncate(trans, root, path,
750 if (item_end < inode->i_size) {
751 if (found_type == BTRFS_DIR_ITEM_KEY) {
752 found_type = BTRFS_INODE_ITEM_KEY;
753 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
754 found_type = BTRFS_CSUM_ITEM_KEY;
755 } else if (found_type) {
760 btrfs_set_key_type(&key, found_type);
761 btrfs_release_path(root, path);
764 if (found_key.offset >= inode->i_size)
770 /* FIXME, shrink the extent if the ref count is only 1 */
771 if (found_type != BTRFS_EXTENT_DATA_KEY)
774 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
776 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
779 btrfs_file_extent_num_bytes(leaf, fi);
780 extent_num_bytes = inode->i_size -
781 found_key.offset + root->sectorsize - 1;
782 btrfs_set_file_extent_num_bytes(leaf, fi,
784 num_dec = (orig_num_bytes -
785 extent_num_bytes) >> 9;
786 if (extent_start != 0) {
787 inode->i_blocks -= num_dec;
789 btrfs_mark_buffer_dirty(leaf);
792 btrfs_file_extent_disk_num_bytes(leaf,
794 /* FIXME blocksize != 4096 */
795 num_dec = btrfs_file_extent_num_bytes(leaf,
797 if (extent_start != 0) {
799 inode->i_blocks -= num_dec;
801 root_gen = btrfs_header_generation(leaf);
802 root_owner = btrfs_header_owner(leaf);
804 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE &&
806 u32 newsize = inode->i_size - found_key.offset;
807 newsize = btrfs_file_extent_calc_inline_size(newsize);
808 ret = btrfs_truncate_item(trans, root, path,
814 ret = btrfs_del_item(trans, root, path);
820 btrfs_release_path(root, path);
822 ret = btrfs_free_extent(trans, root, extent_start,
825 root_gen, inode->i_ino,
826 found_key.offset, 0);
832 btrfs_release_path(root, path);
833 btrfs_free_path(path);
834 inode->i_sb->s_dirt = 1;
838 static int btrfs_cow_one_page(struct inode *inode, struct page *page,
842 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
843 struct btrfs_root *root = BTRFS_I(inode)->root;
844 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
845 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
846 u64 existing_delalloc;
850 WARN_ON(!PageLocked(page));
851 set_page_extent_mapped(page);
853 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
854 delalloc_start = page_start;
855 existing_delalloc = count_range_bits(&BTRFS_I(inode)->extent_tree,
856 &delalloc_start, page_end,
857 PAGE_CACHE_SIZE, EXTENT_DELALLOC);
858 set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start,
861 spin_lock(&root->fs_info->delalloc_lock);
862 root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE - existing_delalloc;
863 spin_unlock(&root->fs_info->delalloc_lock);
865 if (zero_start != PAGE_CACHE_SIZE) {
867 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
868 flush_dcache_page(page);
871 set_page_dirty(page);
872 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
878 * taken from block_truncate_page, but does cow as it zeros out
879 * any bytes left in the last page in the file.
881 static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
883 struct inode *inode = mapping->host;
884 struct btrfs_root *root = BTRFS_I(inode)->root;
885 u32 blocksize = root->sectorsize;
886 pgoff_t index = from >> PAGE_CACHE_SHIFT;
887 unsigned offset = from & (PAGE_CACHE_SIZE-1);
892 if ((offset & (blocksize - 1)) == 0)
895 down_read(&root->snap_sem);
897 page = grab_cache_page(mapping, index);
900 if (!PageUptodate(page)) {
901 ret = btrfs_readpage(NULL, page);
903 if (!PageUptodate(page)) {
908 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
910 ret = btrfs_cow_one_page(inode, page, offset);
913 page_cache_release(page);
914 up_read(&BTRFS_I(inode)->root->snap_sem);
919 static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
921 struct inode *inode = dentry->d_inode;
924 err = inode_change_ok(inode, attr);
928 if (S_ISREG(inode->i_mode) &&
929 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
930 struct btrfs_trans_handle *trans;
931 struct btrfs_root *root = BTRFS_I(inode)->root;
932 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
934 u64 mask = root->sectorsize - 1;
935 u64 pos = (inode->i_size + mask) & ~mask;
936 u64 block_end = attr->ia_size | mask;
940 if (attr->ia_size <= pos)
943 mutex_lock(&root->fs_info->fs_mutex);
944 err = btrfs_check_free_space(root, 1, 0);
945 mutex_unlock(&root->fs_info->fs_mutex);
949 btrfs_truncate_page(inode->i_mapping, inode->i_size);
951 lock_extent(em_tree, pos, block_end, GFP_NOFS);
952 hole_size = (attr->ia_size - pos + mask) & ~mask;
954 mutex_lock(&root->fs_info->fs_mutex);
955 trans = btrfs_start_transaction(root, 1);
956 btrfs_set_trans_block_group(trans, inode);
957 err = btrfs_drop_extents(trans, root, inode,
958 pos, pos + hole_size, pos,
961 if (alloc_hint != EXTENT_MAP_INLINE) {
962 err = btrfs_insert_file_extent(trans, root,
964 pos, 0, 0, hole_size);
966 btrfs_end_transaction(trans, root);
967 mutex_unlock(&root->fs_info->fs_mutex);
968 unlock_extent(em_tree, pos, block_end, GFP_NOFS);
973 err = inode_setattr(inode, attr);
977 void btrfs_delete_inode(struct inode *inode)
979 struct btrfs_trans_handle *trans;
980 struct btrfs_root *root = BTRFS_I(inode)->root;
984 truncate_inode_pages(&inode->i_data, 0);
985 if (is_bad_inode(inode)) {
990 mutex_lock(&root->fs_info->fs_mutex);
991 trans = btrfs_start_transaction(root, 1);
993 btrfs_set_trans_block_group(trans, inode);
994 ret = btrfs_truncate_in_trans(trans, root, inode);
997 ret = btrfs_delete_xattrs(trans, root, inode);
1000 ret = btrfs_free_inode(trans, root, inode);
1002 goto no_delete_lock;
1003 nr = trans->blocks_used;
1005 btrfs_end_transaction(trans, root);
1006 mutex_unlock(&root->fs_info->fs_mutex);
1007 btrfs_btree_balance_dirty(root, nr);
1011 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);
1020 * this returns the key found in the dir entry in the location pointer.
1021 * If no dir entries were found, location->objectid is 0.
1023 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1024 struct btrfs_key *location)
1026 const char *name = dentry->d_name.name;
1027 int namelen = dentry->d_name.len;
1028 struct btrfs_dir_item *di;
1029 struct btrfs_path *path;
1030 struct btrfs_root *root = BTRFS_I(dir)->root;
1033 if (namelen == 1 && strcmp(name, ".") == 0) {
1034 location->objectid = dir->i_ino;
1035 location->type = BTRFS_INODE_ITEM_KEY;
1036 location->offset = 0;
1039 path = btrfs_alloc_path();
1042 if (namelen == 2 && strcmp(name, "..") == 0) {
1043 struct btrfs_key key;
1044 struct extent_buffer *leaf;
1048 key.objectid = dir->i_ino;
1049 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1051 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1055 leaf = path->nodes[0];
1056 slot = path->slots[0];
1057 nritems = btrfs_header_nritems(leaf);
1058 if (slot >= nritems)
1061 btrfs_item_key_to_cpu(leaf, &key, slot);
1062 if (key.objectid != dir->i_ino ||
1063 key.type != BTRFS_INODE_REF_KEY) {
1066 location->objectid = key.offset;
1067 location->type = BTRFS_INODE_ITEM_KEY;
1068 location->offset = 0;
1072 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1076 if (!di || IS_ERR(di)) {
1079 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
1081 btrfs_free_path(path);
1084 location->objectid = 0;
1089 * when we hit a tree root in a directory, the btrfs part of the inode
1090 * needs to be changed to reflect the root directory of the tree root. This
1091 * is kind of like crossing a mount point.
1093 static int fixup_tree_root_location(struct btrfs_root *root,
1094 struct btrfs_key *location,
1095 struct btrfs_root **sub_root,
1096 struct dentry *dentry)
1098 struct btrfs_path *path;
1099 struct btrfs_root_item *ri;
1101 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1103 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1106 path = btrfs_alloc_path();
1108 mutex_lock(&root->fs_info->fs_mutex);
1110 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1111 dentry->d_name.name,
1112 dentry->d_name.len);
1113 if (IS_ERR(*sub_root))
1114 return PTR_ERR(*sub_root);
1116 ri = &(*sub_root)->root_item;
1117 location->objectid = btrfs_root_dirid(ri);
1118 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1119 location->offset = 0;
1121 btrfs_free_path(path);
1122 mutex_unlock(&root->fs_info->fs_mutex);
1126 static int btrfs_init_locked_inode(struct inode *inode, void *p)
1128 struct btrfs_iget_args *args = p;
1129 inode->i_ino = args->ino;
1130 BTRFS_I(inode)->root = args->root;
1131 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1132 inode->i_mapping, GFP_NOFS);
1136 static int btrfs_find_actor(struct inode *inode, void *opaque)
1138 struct btrfs_iget_args *args = opaque;
1139 return (args->ino == inode->i_ino &&
1140 args->root == BTRFS_I(inode)->root);
1143 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1144 struct btrfs_root *root)
1146 struct inode *inode;
1147 struct btrfs_iget_args args;
1148 args.ino = objectid;
1151 inode = iget5_locked(s, objectid, btrfs_find_actor,
1152 btrfs_init_locked_inode,
1157 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1158 struct nameidata *nd)
1160 struct inode * inode;
1161 struct btrfs_inode *bi = BTRFS_I(dir);
1162 struct btrfs_root *root = bi->root;
1163 struct btrfs_root *sub_root = root;
1164 struct btrfs_key location;
1167 if (dentry->d_name.len > BTRFS_NAME_LEN)
1168 return ERR_PTR(-ENAMETOOLONG);
1170 mutex_lock(&root->fs_info->fs_mutex);
1171 ret = btrfs_inode_by_name(dir, dentry, &location);
1172 mutex_unlock(&root->fs_info->fs_mutex);
1175 return ERR_PTR(ret);
1178 if (location.objectid) {
1179 ret = fixup_tree_root_location(root, &location, &sub_root,
1182 return ERR_PTR(ret);
1184 return ERR_PTR(-ENOENT);
1185 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1188 return ERR_PTR(-EACCES);
1189 if (inode->i_state & I_NEW) {
1190 /* the inode and parent dir are two different roots */
1191 if (sub_root != root) {
1193 sub_root->inode = inode;
1195 BTRFS_I(inode)->root = sub_root;
1196 memcpy(&BTRFS_I(inode)->location, &location,
1198 btrfs_read_locked_inode(inode);
1199 unlock_new_inode(inode);
1202 return d_splice_alias(inode, dentry);
1205 static unsigned char btrfs_filetype_table[] = {
1206 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1209 static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1211 struct inode *inode = filp->f_dentry->d_inode;
1212 struct btrfs_root *root = BTRFS_I(inode)->root;
1213 struct btrfs_item *item;
1214 struct btrfs_dir_item *di;
1215 struct btrfs_key key;
1216 struct btrfs_key found_key;
1217 struct btrfs_path *path;
1220 struct extent_buffer *leaf;
1223 unsigned char d_type;
1228 int key_type = BTRFS_DIR_INDEX_KEY;
1233 /* FIXME, use a real flag for deciding about the key type */
1234 if (root->fs_info->tree_root == root)
1235 key_type = BTRFS_DIR_ITEM_KEY;
1237 /* special case for "." */
1238 if (filp->f_pos == 0) {
1239 over = filldir(dirent, ".", 1,
1247 mutex_lock(&root->fs_info->fs_mutex);
1248 key.objectid = inode->i_ino;
1249 path = btrfs_alloc_path();
1252 /* special case for .., just use the back ref */
1253 if (filp->f_pos == 1) {
1254 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1256 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1258 leaf = path->nodes[0];
1259 slot = path->slots[0];
1260 nritems = btrfs_header_nritems(leaf);
1261 if (slot >= nritems) {
1262 btrfs_release_path(root, path);
1263 goto read_dir_items;
1265 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1266 btrfs_release_path(root, path);
1267 if (found_key.objectid != key.objectid ||
1268 found_key.type != BTRFS_INODE_REF_KEY)
1269 goto read_dir_items;
1270 over = filldir(dirent, "..", 2,
1271 2, found_key.offset, DT_DIR);
1278 btrfs_set_key_type(&key, key_type);
1279 key.offset = filp->f_pos;
1281 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1286 leaf = path->nodes[0];
1287 nritems = btrfs_header_nritems(leaf);
1288 slot = path->slots[0];
1289 if (advance || slot >= nritems) {
1290 if (slot >= nritems -1) {
1291 ret = btrfs_next_leaf(root, path);
1294 leaf = path->nodes[0];
1295 nritems = btrfs_header_nritems(leaf);
1296 slot = path->slots[0];
1303 item = btrfs_item_nr(leaf, slot);
1304 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1306 if (found_key.objectid != key.objectid)
1308 if (btrfs_key_type(&found_key) != key_type)
1310 if (found_key.offset < filp->f_pos)
1313 filp->f_pos = found_key.offset;
1315 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1317 di_total = btrfs_item_size(leaf, item);
1318 while(di_cur < di_total) {
1319 struct btrfs_key location;
1321 name_len = btrfs_dir_name_len(leaf, di);
1322 if (name_len < 32) {
1323 name_ptr = tmp_name;
1325 name_ptr = kmalloc(name_len, GFP_NOFS);
1328 read_extent_buffer(leaf, name_ptr,
1329 (unsigned long)(di + 1), name_len);
1331 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1332 btrfs_dir_item_key_to_cpu(leaf, di, &location);
1334 over = filldir(dirent, name_ptr, name_len,
1339 if (name_ptr != tmp_name)
1344 di_len = btrfs_dir_name_len(leaf, di) +
1345 btrfs_dir_data_len(leaf, di) +sizeof(*di);
1347 di = (struct btrfs_dir_item *)((char *)di + di_len);
1354 btrfs_release_path(root, path);
1355 btrfs_free_path(path);
1356 mutex_unlock(&root->fs_info->fs_mutex);
1360 int btrfs_write_inode(struct inode *inode, int wait)
1362 struct btrfs_root *root = BTRFS_I(inode)->root;
1363 struct btrfs_trans_handle *trans;
1367 mutex_lock(&root->fs_info->fs_mutex);
1368 trans = btrfs_start_transaction(root, 1);
1369 btrfs_set_trans_block_group(trans, inode);
1370 ret = btrfs_commit_transaction(trans, root);
1371 mutex_unlock(&root->fs_info->fs_mutex);
1377 * This is somewhat expensive, updating the tree every time the
1378 * inode changes. But, it is most likely to find the inode in cache.
1379 * FIXME, needs more benchmarking...there are no reasons other than performance
1380 * to keep or drop this code.
1382 void btrfs_dirty_inode(struct inode *inode)
1384 struct btrfs_root *root = BTRFS_I(inode)->root;
1385 struct btrfs_trans_handle *trans;
1387 mutex_lock(&root->fs_info->fs_mutex);
1388 trans = btrfs_start_transaction(root, 1);
1389 btrfs_set_trans_block_group(trans, inode);
1390 btrfs_update_inode(trans, root, inode);
1391 btrfs_end_transaction(trans, root);
1392 mutex_unlock(&root->fs_info->fs_mutex);
1395 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1396 struct btrfs_root *root,
1398 struct btrfs_block_group_cache *group,
1401 struct inode *inode;
1402 struct btrfs_inode_item *inode_item;
1403 struct btrfs_key *location;
1404 struct btrfs_path *path;
1408 path = btrfs_alloc_path();
1411 inode = new_inode(root->fs_info->sb);
1413 return ERR_PTR(-ENOMEM);
1415 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1416 inode->i_mapping, GFP_NOFS);
1417 BTRFS_I(inode)->root = root;
1423 group = btrfs_find_block_group(root, group, 0, 0, owner);
1424 BTRFS_I(inode)->block_group = group;
1426 ret = btrfs_insert_empty_inode(trans, root, path, objectid);
1430 inode->i_uid = current->fsuid;
1431 inode->i_gid = current->fsgid;
1432 inode->i_mode = mode;
1433 inode->i_ino = objectid;
1434 inode->i_blocks = 0;
1435 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1436 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1437 struct btrfs_inode_item);
1438 fill_inode_item(path->nodes[0], inode_item, inode);
1439 btrfs_mark_buffer_dirty(path->nodes[0]);
1440 btrfs_free_path(path);
1442 location = &BTRFS_I(inode)->location;
1443 location->objectid = objectid;
1444 location->offset = 0;
1445 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1447 insert_inode_hash(inode);
1450 btrfs_free_path(path);
1451 return ERR_PTR(ret);
1454 static inline u8 btrfs_inode_type(struct inode *inode)
1456 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1459 static int btrfs_add_link(struct btrfs_trans_handle *trans,
1460 struct dentry *dentry, struct inode *inode)
1463 struct btrfs_key key;
1464 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
1465 struct inode *parent_inode;
1467 key.objectid = inode->i_ino;
1468 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1471 ret = btrfs_insert_dir_item(trans, root,
1472 dentry->d_name.name, dentry->d_name.len,
1473 dentry->d_parent->d_inode->i_ino,
1474 &key, btrfs_inode_type(inode));
1476 ret = btrfs_insert_inode_ref(trans, root,
1477 dentry->d_name.name,
1480 dentry->d_parent->d_inode->i_ino);
1481 parent_inode = dentry->d_parent->d_inode;
1482 parent_inode->i_size += dentry->d_name.len * 2;
1483 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
1484 ret = btrfs_update_inode(trans, root,
1485 dentry->d_parent->d_inode);
1490 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1491 struct dentry *dentry, struct inode *inode)
1493 int err = btrfs_add_link(trans, dentry, inode);
1495 d_instantiate(dentry, inode);
1503 static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1504 int mode, dev_t rdev)
1506 struct btrfs_trans_handle *trans;
1507 struct btrfs_root *root = BTRFS_I(dir)->root;
1508 struct inode *inode = NULL;
1512 unsigned long nr = 0;
1514 if (!new_valid_dev(rdev))
1517 mutex_lock(&root->fs_info->fs_mutex);
1518 err = btrfs_check_free_space(root, 1, 0);
1522 trans = btrfs_start_transaction(root, 1);
1523 btrfs_set_trans_block_group(trans, dir);
1525 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1531 inode = btrfs_new_inode(trans, root, objectid,
1532 BTRFS_I(dir)->block_group, mode);
1533 err = PTR_ERR(inode);
1537 btrfs_set_trans_block_group(trans, inode);
1538 err = btrfs_add_nondir(trans, dentry, inode);
1542 inode->i_op = &btrfs_special_inode_operations;
1543 init_special_inode(inode, inode->i_mode, rdev);
1544 btrfs_update_inode(trans, root, inode);
1546 dir->i_sb->s_dirt = 1;
1547 btrfs_update_inode_block_group(trans, inode);
1548 btrfs_update_inode_block_group(trans, dir);
1550 nr = trans->blocks_used;
1551 btrfs_end_transaction(trans, root);
1553 mutex_unlock(&root->fs_info->fs_mutex);
1556 inode_dec_link_count(inode);
1559 btrfs_btree_balance_dirty(root, nr);
1563 static int btrfs_create(struct inode *dir, struct dentry *dentry,
1564 int mode, struct nameidata *nd)
1566 struct btrfs_trans_handle *trans;
1567 struct btrfs_root *root = BTRFS_I(dir)->root;
1568 struct inode *inode = NULL;
1571 unsigned long nr = 0;
1574 mutex_lock(&root->fs_info->fs_mutex);
1575 err = btrfs_check_free_space(root, 1, 0);
1578 trans = btrfs_start_transaction(root, 1);
1579 btrfs_set_trans_block_group(trans, dir);
1581 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1587 inode = btrfs_new_inode(trans, root, objectid,
1588 BTRFS_I(dir)->block_group, mode);
1589 err = PTR_ERR(inode);
1593 btrfs_set_trans_block_group(trans, inode);
1594 err = btrfs_add_nondir(trans, dentry, inode);
1598 inode->i_mapping->a_ops = &btrfs_aops;
1599 inode->i_fop = &btrfs_file_operations;
1600 inode->i_op = &btrfs_file_inode_operations;
1601 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1602 inode->i_mapping, GFP_NOFS);
1603 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
1605 dir->i_sb->s_dirt = 1;
1606 btrfs_update_inode_block_group(trans, inode);
1607 btrfs_update_inode_block_group(trans, dir);
1609 nr = trans->blocks_used;
1610 btrfs_end_transaction(trans, root);
1612 mutex_unlock(&root->fs_info->fs_mutex);
1615 inode_dec_link_count(inode);
1618 btrfs_btree_balance_dirty(root, nr);
1622 static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1623 struct dentry *dentry)
1625 struct btrfs_trans_handle *trans;
1626 struct btrfs_root *root = BTRFS_I(dir)->root;
1627 struct inode *inode = old_dentry->d_inode;
1628 unsigned long nr = 0;
1632 if (inode->i_nlink == 0)
1635 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1640 mutex_lock(&root->fs_info->fs_mutex);
1641 err = btrfs_check_free_space(root, 1, 0);
1644 trans = btrfs_start_transaction(root, 1);
1646 btrfs_set_trans_block_group(trans, dir);
1647 atomic_inc(&inode->i_count);
1648 err = btrfs_add_nondir(trans, dentry, inode);
1653 dir->i_sb->s_dirt = 1;
1654 btrfs_update_inode_block_group(trans, dir);
1655 err = btrfs_update_inode(trans, root, inode);
1660 nr = trans->blocks_used;
1661 btrfs_end_transaction(trans, root);
1663 mutex_unlock(&root->fs_info->fs_mutex);
1666 inode_dec_link_count(inode);
1669 btrfs_btree_balance_dirty(root, nr);
1673 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1675 struct inode *inode;
1676 struct btrfs_trans_handle *trans;
1677 struct btrfs_root *root = BTRFS_I(dir)->root;
1679 int drop_on_err = 0;
1681 unsigned long nr = 1;
1683 mutex_lock(&root->fs_info->fs_mutex);
1684 err = btrfs_check_free_space(root, 1, 0);
1688 trans = btrfs_start_transaction(root, 1);
1689 btrfs_set_trans_block_group(trans, dir);
1691 if (IS_ERR(trans)) {
1692 err = PTR_ERR(trans);
1696 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1702 inode = btrfs_new_inode(trans, root, objectid,
1703 BTRFS_I(dir)->block_group, S_IFDIR | mode);
1704 if (IS_ERR(inode)) {
1705 err = PTR_ERR(inode);
1710 inode->i_op = &btrfs_dir_inode_operations;
1711 inode->i_fop = &btrfs_dir_file_operations;
1712 btrfs_set_trans_block_group(trans, inode);
1715 err = btrfs_update_inode(trans, root, inode);
1719 err = btrfs_add_link(trans, dentry, inode);
1723 d_instantiate(dentry, inode);
1725 dir->i_sb->s_dirt = 1;
1726 btrfs_update_inode_block_group(trans, inode);
1727 btrfs_update_inode_block_group(trans, dir);
1730 nr = trans->blocks_used;
1731 btrfs_end_transaction(trans, root);
1734 mutex_unlock(&root->fs_info->fs_mutex);
1737 btrfs_btree_balance_dirty(root, nr);
1741 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1742 size_t page_offset, u64 start, u64 end,
1748 u64 extent_start = 0;
1750 u64 objectid = inode->i_ino;
1752 int failed_insert = 0;
1753 struct btrfs_path *path;
1754 struct btrfs_root *root = BTRFS_I(inode)->root;
1755 struct btrfs_file_extent_item *item;
1756 struct extent_buffer *leaf;
1757 struct btrfs_key found_key;
1758 struct extent_map *em = NULL;
1759 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1760 struct btrfs_trans_handle *trans = NULL;
1762 path = btrfs_alloc_path();
1764 mutex_lock(&root->fs_info->fs_mutex);
1767 em = lookup_extent_mapping(em_tree, start, end);
1772 em = alloc_extent_map(GFP_NOFS);
1777 em->start = EXTENT_MAP_HOLE;
1778 em->end = EXTENT_MAP_HOLE;
1780 em->bdev = inode->i_sb->s_bdev;
1781 ret = btrfs_lookup_file_extent(trans, root, path,
1782 objectid, start, trans != NULL);
1789 if (path->slots[0] == 0)
1794 leaf = path->nodes[0];
1795 item = btrfs_item_ptr(leaf, path->slots[0],
1796 struct btrfs_file_extent_item);
1797 /* are we inside the extent that was found? */
1798 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1799 found_type = btrfs_key_type(&found_key);
1800 if (found_key.objectid != objectid ||
1801 found_type != BTRFS_EXTENT_DATA_KEY) {
1805 found_type = btrfs_file_extent_type(leaf, item);
1806 extent_start = found_key.offset;
1807 if (found_type == BTRFS_FILE_EXTENT_REG) {
1808 extent_end = extent_start +
1809 btrfs_file_extent_num_bytes(leaf, item);
1811 if (start < extent_start || start >= extent_end) {
1813 if (start < extent_start) {
1814 if (end < extent_start)
1816 em->end = extent_end - 1;
1822 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
1824 em->start = extent_start;
1825 em->end = extent_end - 1;
1826 em->block_start = EXTENT_MAP_HOLE;
1827 em->block_end = EXTENT_MAP_HOLE;
1830 bytenr += btrfs_file_extent_offset(leaf, item);
1831 em->block_start = bytenr;
1832 em->block_end = em->block_start +
1833 btrfs_file_extent_num_bytes(leaf, item) - 1;
1834 em->start = extent_start;
1835 em->end = extent_end - 1;
1837 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
1841 size_t extent_offset;
1844 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
1846 extent_end = (extent_start + size - 1) |
1847 ((u64)root->sectorsize - 1);
1848 if (start < extent_start || start >= extent_end) {
1850 if (start < extent_start) {
1851 if (end < extent_start)
1853 em->end = extent_end;
1859 em->block_start = EXTENT_MAP_INLINE;
1860 em->block_end = EXTENT_MAP_INLINE;
1863 em->start = extent_start;
1864 em->end = extent_start + size - 1;
1868 extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) -
1869 extent_start + page_offset;
1870 copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset,
1871 size - extent_offset);
1872 em->start = extent_start + extent_offset;
1873 em->end = (em->start + copy_size -1) |
1874 ((u64)root->sectorsize -1);
1876 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
1877 if (create == 0 && !PageUptodate(page)) {
1878 read_extent_buffer(leaf, map + page_offset, ptr,
1880 flush_dcache_page(page);
1881 } else if (create && PageUptodate(page)) {
1884 free_extent_map(em);
1886 btrfs_release_path(root, path);
1887 trans = btrfs_start_transaction(root, 1);
1890 write_extent_buffer(leaf, map + page_offset, ptr,
1892 btrfs_mark_buffer_dirty(leaf);
1895 set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS);
1898 printk("unkknown found_type %d\n", found_type);
1905 em->block_start = EXTENT_MAP_HOLE;
1906 em->block_end = EXTENT_MAP_HOLE;
1908 btrfs_release_path(root, path);
1909 if (em->start > start || em->end < start) {
1910 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end);
1914 ret = add_extent_mapping(em_tree, em);
1915 if (ret == -EEXIST) {
1916 free_extent_map(em);
1918 if (0 && failed_insert == 1) {
1919 btrfs_drop_extent_cache(inode, start, end);
1922 if (failed_insert > 5) {
1923 printk("failing to insert %Lu %Lu\n", start, end);
1931 btrfs_free_path(path);
1933 ret = btrfs_end_transaction(trans, root);
1937 mutex_unlock(&root->fs_info->fs_mutex);
1939 free_extent_map(em);
1941 return ERR_PTR(err);
1946 static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
1948 return extent_bmap(mapping, iblock, btrfs_get_extent);
1951 static int btrfs_prepare_write(struct file *file, struct page *page,
1952 unsigned from, unsigned to)
1954 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
1957 mutex_lock(&root->fs_info->fs_mutex);
1958 err = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
1959 mutex_unlock(&root->fs_info->fs_mutex);
1963 return extent_prepare_write(&BTRFS_I(page->mapping->host)->extent_tree,
1964 page->mapping->host, page, from, to,
1968 int btrfs_readpage(struct file *file, struct page *page)
1970 struct extent_map_tree *tree;
1971 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1972 return extent_read_full_page(tree, page, btrfs_get_extent);
1975 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
1977 struct extent_map_tree *tree;
1980 if (current->flags & PF_MEMALLOC) {
1981 redirty_page_for_writepage(wbc, page);
1985 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1986 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
1989 static int btrfs_writepages(struct address_space *mapping,
1990 struct writeback_control *wbc)
1992 struct extent_map_tree *tree;
1993 tree = &BTRFS_I(mapping->host)->extent_tree;
1994 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
1998 btrfs_readpages(struct file *file, struct address_space *mapping,
1999 struct list_head *pages, unsigned nr_pages)
2001 struct extent_map_tree *tree;
2002 tree = &BTRFS_I(mapping->host)->extent_tree;
2003 return extent_readpages(tree, mapping, pages, nr_pages,
2007 static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
2009 struct extent_map_tree *tree;
2012 tree = &BTRFS_I(page->mapping->host)->extent_tree;
2013 ret = try_release_extent_mapping(tree, page);
2015 ClearPagePrivate(page);
2016 set_page_private(page, 0);
2017 page_cache_release(page);
2022 static void btrfs_invalidatepage(struct page *page, unsigned long offset)
2024 struct extent_map_tree *tree;
2026 tree = &BTRFS_I(page->mapping->host)->extent_tree;
2027 extent_invalidatepage(tree, page, offset);
2028 btrfs_releasepage(page, GFP_NOFS);
2032 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2033 * called from a page fault handler when a page is first dirtied. Hence we must
2034 * be careful to check for EOF conditions here. We set the page up correctly
2035 * for a written page which means we get ENOSPC checking when writing into
2036 * holes and correct delalloc and unwritten extent mapping on filesystems that
2037 * support these features.
2039 * We are not allowed to take the i_mutex here so we have to play games to
2040 * protect against truncate races as the page could now be beyond EOF. Because
2041 * vmtruncate() writes the inode size before removing pages, once we have the
2042 * page lock we can determine safely if the page is beyond EOF. If it is not
2043 * beyond EOF, then the page is guaranteed safe against truncation until we
2046 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2048 struct inode *inode = fdentry(vma->vm_file)->d_inode;
2049 struct btrfs_root *root = BTRFS_I(inode)->root;
2055 mutex_lock(&root->fs_info->fs_mutex);
2056 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
2057 mutex_lock(&root->fs_info->fs_mutex);
2063 down_read(&BTRFS_I(inode)->root->snap_sem);
2065 wait_on_page_writeback(page);
2066 size = i_size_read(inode);
2067 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2069 if ((page->mapping != inode->i_mapping) ||
2070 (page_start > size)) {
2071 /* page got truncated out from underneath us */
2075 /* page is wholly or partially inside EOF */
2076 if (page_start + PAGE_CACHE_SIZE > size)
2077 end = size & ~PAGE_CACHE_MASK;
2079 end = PAGE_CACHE_SIZE;
2081 ret = btrfs_cow_one_page(inode, page, end);
2084 up_read(&BTRFS_I(inode)->root->snap_sem);
2090 static void btrfs_truncate(struct inode *inode)
2092 struct btrfs_root *root = BTRFS_I(inode)->root;
2094 struct btrfs_trans_handle *trans;
2097 if (!S_ISREG(inode->i_mode))
2099 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2102 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2104 mutex_lock(&root->fs_info->fs_mutex);
2105 trans = btrfs_start_transaction(root, 1);
2106 btrfs_set_trans_block_group(trans, inode);
2108 /* FIXME, add redo link to tree so we don't leak on crash */
2109 ret = btrfs_truncate_in_trans(trans, root, inode);
2110 btrfs_update_inode(trans, root, inode);
2111 nr = trans->blocks_used;
2113 ret = btrfs_end_transaction(trans, root);
2115 mutex_unlock(&root->fs_info->fs_mutex);
2116 btrfs_btree_balance_dirty(root, nr);
2119 int btrfs_commit_write(struct file *file, struct page *page,
2120 unsigned from, unsigned to)
2122 loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
2123 struct inode *inode = page->mapping->host;
2125 btrfs_cow_one_page(inode, page, PAGE_CACHE_SIZE);
2127 if (pos > inode->i_size) {
2128 i_size_write(inode, pos);
2129 mark_inode_dirty(inode);
2134 static int create_subvol(struct btrfs_root *root, char *name, int namelen)
2136 struct btrfs_trans_handle *trans;
2137 struct btrfs_key key;
2138 struct btrfs_root_item root_item;
2139 struct btrfs_inode_item *inode_item;
2140 struct extent_buffer *leaf;
2141 struct btrfs_root *new_root;
2142 struct inode *inode;
2147 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
2148 unsigned long nr = 1;
2150 mutex_lock(&root->fs_info->fs_mutex);
2151 ret = btrfs_check_free_space(root, 1, 0);
2155 trans = btrfs_start_transaction(root, 1);
2158 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2163 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2164 objectid, trans->transid, 0, 0,
2167 return PTR_ERR(leaf);
2169 btrfs_set_header_nritems(leaf, 0);
2170 btrfs_set_header_level(leaf, 0);
2171 btrfs_set_header_bytenr(leaf, leaf->start);
2172 btrfs_set_header_generation(leaf, trans->transid);
2173 btrfs_set_header_owner(leaf, objectid);
2175 write_extent_buffer(leaf, root->fs_info->fsid,
2176 (unsigned long)btrfs_header_fsid(leaf),
2178 btrfs_mark_buffer_dirty(leaf);
2180 inode_item = &root_item.inode;
2181 memset(inode_item, 0, sizeof(*inode_item));
2182 inode_item->generation = cpu_to_le64(1);
2183 inode_item->size = cpu_to_le64(3);
2184 inode_item->nlink = cpu_to_le32(1);
2185 inode_item->nblocks = cpu_to_le64(1);
2186 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
2188 btrfs_set_root_bytenr(&root_item, leaf->start);
2189 btrfs_set_root_level(&root_item, 0);
2190 btrfs_set_root_refs(&root_item, 1);
2191 btrfs_set_root_used(&root_item, 0);
2193 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2194 root_item.drop_level = 0;
2196 free_extent_buffer(leaf);
2199 btrfs_set_root_dirid(&root_item, new_dirid);
2201 key.objectid = objectid;
2203 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2204 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2210 * insert the directory item
2212 key.offset = (u64)-1;
2213 dir = root->fs_info->sb->s_root->d_inode;
2214 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2215 name, namelen, dir->i_ino, &key,
2220 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2221 name, namelen, objectid,
2222 root->fs_info->sb->s_root->d_inode->i_ino);
2226 ret = btrfs_commit_transaction(trans, root);
2230 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
2233 trans = btrfs_start_transaction(new_root, 1);
2236 inode = btrfs_new_inode(trans, new_root, new_dirid,
2237 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
2240 inode->i_op = &btrfs_dir_inode_operations;
2241 inode->i_fop = &btrfs_dir_file_operations;
2242 new_root->inode = inode;
2244 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2248 ret = btrfs_update_inode(trans, new_root, inode);
2252 nr = trans->blocks_used;
2253 err = btrfs_commit_transaction(trans, root);
2257 mutex_unlock(&root->fs_info->fs_mutex);
2258 btrfs_btree_balance_dirty(root, nr);
2262 static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2264 struct btrfs_trans_handle *trans;
2265 struct btrfs_key key;
2266 struct btrfs_root_item new_root_item;
2267 struct extent_buffer *tmp;
2271 unsigned long nr = 0;
2273 if (!root->ref_cows)
2276 down_write(&root->snap_sem);
2277 freeze_bdev(root->fs_info->sb->s_bdev);
2278 thaw_bdev(root->fs_info->sb->s_bdev, root->fs_info->sb);
2280 mutex_lock(&root->fs_info->fs_mutex);
2281 ret = btrfs_check_free_space(root, 1, 0);
2285 trans = btrfs_start_transaction(root, 1);
2288 ret = btrfs_update_inode(trans, root, root->inode);
2292 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2297 memcpy(&new_root_item, &root->root_item,
2298 sizeof(new_root_item));
2300 key.objectid = objectid;
2302 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2304 extent_buffer_get(root->node);
2305 btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp);
2306 free_extent_buffer(tmp);
2308 btrfs_copy_root(trans, root, root->node, &tmp, objectid);
2310 btrfs_set_root_bytenr(&new_root_item, tmp->start);
2311 btrfs_set_root_level(&new_root_item, btrfs_header_level(tmp));
2312 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2314 free_extent_buffer(tmp);
2319 * insert the directory item
2321 key.offset = (u64)-1;
2322 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2324 root->fs_info->sb->s_root->d_inode->i_ino,
2325 &key, BTRFS_FT_DIR);
2330 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2331 name, namelen, objectid,
2332 root->fs_info->sb->s_root->d_inode->i_ino);
2337 nr = trans->blocks_used;
2338 err = btrfs_commit_transaction(trans, root);
2343 mutex_unlock(&root->fs_info->fs_mutex);
2344 up_write(&root->snap_sem);
2345 btrfs_btree_balance_dirty(root, nr);
2349 unsigned long btrfs_force_ra(struct address_space *mapping,
2350 struct file_ra_state *ra, struct file *file,
2351 pgoff_t offset, pgoff_t last_index)
2355 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2356 req_size = last_index - offset + 1;
2357 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2360 req_size = min(last_index - offset + 1, (pgoff_t)128);
2361 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2362 return offset + req_size;
2366 int btrfs_defrag_file(struct file *file) {
2367 struct inode *inode = fdentry(file)->d_inode;
2368 struct btrfs_root *root = BTRFS_I(inode)->root;
2369 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
2371 unsigned long last_index;
2372 unsigned long ra_index = 0;
2376 u64 existing_delalloc;
2380 mutex_lock(&root->fs_info->fs_mutex);
2381 ret = btrfs_check_free_space(root, inode->i_size, 0);
2382 mutex_unlock(&root->fs_info->fs_mutex);
2386 mutex_lock(&inode->i_mutex);
2387 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2388 for (i = 0; i <= last_index; i++) {
2389 if (i == ra_index) {
2390 ra_index = btrfs_force_ra(inode->i_mapping,
2392 file, ra_index, last_index);
2394 page = grab_cache_page(inode->i_mapping, i);
2397 if (!PageUptodate(page)) {
2398 btrfs_readpage(NULL, page);
2400 if (!PageUptodate(page)) {
2402 page_cache_release(page);
2406 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2407 page_end = page_start + PAGE_CACHE_SIZE - 1;
2409 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
2410 delalloc_start = page_start;
2412 count_range_bits(&BTRFS_I(inode)->extent_tree,
2413 &delalloc_start, page_end,
2414 PAGE_CACHE_SIZE, EXTENT_DELALLOC);
2415 set_extent_delalloc(em_tree, page_start,
2416 page_end, GFP_NOFS);
2418 spin_lock(&root->fs_info->delalloc_lock);
2419 root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE -
2421 spin_unlock(&root->fs_info->delalloc_lock);
2423 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
2424 set_page_dirty(page);
2426 page_cache_release(page);
2427 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2431 mutex_unlock(&inode->i_mutex);
2435 static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2439 struct btrfs_ioctl_vol_args *vol_args;
2440 struct btrfs_trans_handle *trans;
2446 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2451 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2455 namelen = strlen(vol_args->name);
2456 if (namelen > BTRFS_VOL_NAME_MAX) {
2461 sizestr = vol_args->name;
2462 if (!strcmp(sizestr, "max"))
2463 new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
2465 if (sizestr[0] == '-') {
2468 } else if (sizestr[0] == '+') {
2472 new_size = btrfs_parse_size(sizestr);
2473 if (new_size == 0) {
2479 mutex_lock(&root->fs_info->fs_mutex);
2480 old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);
2483 if (new_size > old_size) {
2487 new_size = old_size - new_size;
2488 } else if (mod > 0) {
2489 new_size = old_size + new_size;
2492 if (new_size < 256 * 1024 * 1024) {
2496 if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
2500 new_size = (new_size / root->sectorsize) * root->sectorsize;
2502 printk("new size is %Lu\n", new_size);
2503 if (new_size > old_size) {
2504 trans = btrfs_start_transaction(root, 1);
2505 ret = btrfs_grow_extent_tree(trans, root, new_size);
2506 btrfs_commit_transaction(trans, root);
2508 ret = btrfs_shrink_extent_tree(root, new_size);
2512 mutex_unlock(&root->fs_info->fs_mutex);
2518 static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg)
2520 struct btrfs_ioctl_vol_args *vol_args;
2521 struct btrfs_dir_item *di;
2522 struct btrfs_path *path;
2527 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2532 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2537 namelen = strlen(vol_args->name);
2538 if (namelen > BTRFS_VOL_NAME_MAX) {
2542 if (strchr(vol_args->name, '/')) {
2547 path = btrfs_alloc_path();
2553 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2554 mutex_lock(&root->fs_info->fs_mutex);
2555 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2557 vol_args->name, namelen, 0);
2558 mutex_unlock(&root->fs_info->fs_mutex);
2559 btrfs_free_path(path);
2561 if (di && !IS_ERR(di)) {
2571 if (root == root->fs_info->tree_root)
2572 ret = create_subvol(root, vol_args->name, namelen);
2574 ret = create_snapshot(root, vol_args->name, namelen);
2580 static int btrfs_ioctl_defrag(struct file *file)
2582 struct inode *inode = fdentry(file)->d_inode;
2583 struct btrfs_root *root = BTRFS_I(inode)->root;
2585 switch (inode->i_mode & S_IFMT) {
2587 mutex_lock(&root->fs_info->fs_mutex);
2588 btrfs_defrag_root(root, 0);
2589 btrfs_defrag_root(root->fs_info->extent_root, 0);
2590 mutex_unlock(&root->fs_info->fs_mutex);
2593 btrfs_defrag_file(file);
2600 long btrfs_ioctl(struct file *file, unsigned int
2601 cmd, unsigned long arg)
2603 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
2606 case BTRFS_IOC_SNAP_CREATE:
2607 return btrfs_ioctl_snap_create(root, (void __user *)arg);
2608 case BTRFS_IOC_DEFRAG:
2609 return btrfs_ioctl_defrag(file);
2610 case BTRFS_IOC_RESIZE:
2611 return btrfs_ioctl_resize(root, (void __user *)arg);
2618 * Called inside transaction, so use GFP_NOFS
2620 struct inode *btrfs_alloc_inode(struct super_block *sb)
2622 struct btrfs_inode *ei;
2624 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2628 return &ei->vfs_inode;
2631 void btrfs_destroy_inode(struct inode *inode)
2633 WARN_ON(!list_empty(&inode->i_dentry));
2634 WARN_ON(inode->i_data.nrpages);
2636 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2639 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2640 static void init_once(struct kmem_cache * cachep, void *foo)
2642 static void init_once(void * foo, struct kmem_cache * cachep,
2643 unsigned long flags)
2646 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2648 inode_init_once(&ei->vfs_inode);
2651 void btrfs_destroy_cachep(void)
2653 if (btrfs_inode_cachep)
2654 kmem_cache_destroy(btrfs_inode_cachep);
2655 if (btrfs_trans_handle_cachep)
2656 kmem_cache_destroy(btrfs_trans_handle_cachep);
2657 if (btrfs_transaction_cachep)
2658 kmem_cache_destroy(btrfs_transaction_cachep);
2659 if (btrfs_bit_radix_cachep)
2660 kmem_cache_destroy(btrfs_bit_radix_cachep);
2661 if (btrfs_path_cachep)
2662 kmem_cache_destroy(btrfs_path_cachep);
2665 struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
2666 unsigned long extra_flags,
2667 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2668 void (*ctor)(struct kmem_cache *, void *)
2670 void (*ctor)(void *, struct kmem_cache *,
2675 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2676 SLAB_MEM_SPREAD | extra_flags), ctor
2677 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2683 int btrfs_init_cachep(void)
2685 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
2686 sizeof(struct btrfs_inode),
2688 if (!btrfs_inode_cachep)
2690 btrfs_trans_handle_cachep =
2691 btrfs_cache_create("btrfs_trans_handle_cache",
2692 sizeof(struct btrfs_trans_handle),
2694 if (!btrfs_trans_handle_cachep)
2696 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
2697 sizeof(struct btrfs_transaction),
2699 if (!btrfs_transaction_cachep)
2701 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
2702 sizeof(struct btrfs_path),
2704 if (!btrfs_path_cachep)
2706 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
2707 SLAB_DESTROY_BY_RCU, NULL);
2708 if (!btrfs_bit_radix_cachep)
2712 btrfs_destroy_cachep();
2716 static int btrfs_getattr(struct vfsmount *mnt,
2717 struct dentry *dentry, struct kstat *stat)
2719 struct inode *inode = dentry->d_inode;
2720 generic_fillattr(inode, stat);
2721 stat->blksize = 256 * 1024;
2725 static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
2726 struct inode * new_dir,struct dentry *new_dentry)
2728 struct btrfs_trans_handle *trans;
2729 struct btrfs_root *root = BTRFS_I(old_dir)->root;
2730 struct inode *new_inode = new_dentry->d_inode;
2731 struct inode *old_inode = old_dentry->d_inode;
2732 struct timespec ctime = CURRENT_TIME;
2733 struct btrfs_path *path;
2736 if (S_ISDIR(old_inode->i_mode) && new_inode &&
2737 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
2741 mutex_lock(&root->fs_info->fs_mutex);
2742 ret = btrfs_check_free_space(root, 1, 0);
2746 trans = btrfs_start_transaction(root, 1);
2748 btrfs_set_trans_block_group(trans, new_dir);
2749 path = btrfs_alloc_path();
2755 old_dentry->d_inode->i_nlink++;
2756 old_dir->i_ctime = old_dir->i_mtime = ctime;
2757 new_dir->i_ctime = new_dir->i_mtime = ctime;
2758 old_inode->i_ctime = ctime;
2760 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
2765 new_inode->i_ctime = CURRENT_TIME;
2766 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
2770 ret = btrfs_add_link(trans, new_dentry, old_inode);
2775 btrfs_free_path(path);
2776 btrfs_end_transaction(trans, root);
2778 mutex_unlock(&root->fs_info->fs_mutex);
2782 static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
2783 const char *symname)
2785 struct btrfs_trans_handle *trans;
2786 struct btrfs_root *root = BTRFS_I(dir)->root;
2787 struct btrfs_path *path;
2788 struct btrfs_key key;
2789 struct inode *inode = NULL;
2796 struct btrfs_file_extent_item *ei;
2797 struct extent_buffer *leaf;
2798 unsigned long nr = 0;
2800 name_len = strlen(symname) + 1;
2801 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
2802 return -ENAMETOOLONG;
2804 mutex_lock(&root->fs_info->fs_mutex);
2805 err = btrfs_check_free_space(root, 1, 0);
2809 trans = btrfs_start_transaction(root, 1);
2810 btrfs_set_trans_block_group(trans, dir);
2812 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2818 inode = btrfs_new_inode(trans, root, objectid,
2819 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
2820 err = PTR_ERR(inode);
2824 btrfs_set_trans_block_group(trans, inode);
2825 err = btrfs_add_nondir(trans, dentry, inode);
2829 inode->i_mapping->a_ops = &btrfs_aops;
2830 inode->i_fop = &btrfs_file_operations;
2831 inode->i_op = &btrfs_file_inode_operations;
2832 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
2833 inode->i_mapping, GFP_NOFS);
2834 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
2836 dir->i_sb->s_dirt = 1;
2837 btrfs_update_inode_block_group(trans, inode);
2838 btrfs_update_inode_block_group(trans, dir);
2842 path = btrfs_alloc_path();
2844 key.objectid = inode->i_ino;
2846 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2847 datasize = btrfs_file_extent_calc_inline_size(name_len);
2848 err = btrfs_insert_empty_item(trans, root, path, &key,
2854 leaf = path->nodes[0];
2855 ei = btrfs_item_ptr(leaf, path->slots[0],
2856 struct btrfs_file_extent_item);
2857 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
2858 btrfs_set_file_extent_type(leaf, ei,
2859 BTRFS_FILE_EXTENT_INLINE);
2860 ptr = btrfs_file_extent_inline_start(ei);
2861 write_extent_buffer(leaf, symname, ptr, name_len);
2862 btrfs_mark_buffer_dirty(leaf);
2863 btrfs_free_path(path);
2865 inode->i_op = &btrfs_symlink_inode_operations;
2866 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2867 inode->i_size = name_len - 1;
2868 err = btrfs_update_inode(trans, root, inode);
2873 nr = trans->blocks_used;
2874 btrfs_end_transaction(trans, root);
2876 mutex_unlock(&root->fs_info->fs_mutex);
2878 inode_dec_link_count(inode);
2881 btrfs_btree_balance_dirty(root, nr);
2885 static struct inode_operations btrfs_dir_inode_operations = {
2886 .lookup = btrfs_lookup,
2887 .create = btrfs_create,
2888 .unlink = btrfs_unlink,
2890 .mkdir = btrfs_mkdir,
2891 .rmdir = btrfs_rmdir,
2892 .rename = btrfs_rename,
2893 .symlink = btrfs_symlink,
2894 .setattr = btrfs_setattr,
2895 .mknod = btrfs_mknod,
2896 .setxattr = generic_setxattr,
2897 .getxattr = generic_getxattr,
2898 .listxattr = btrfs_listxattr,
2899 .removexattr = generic_removexattr,
2902 static struct inode_operations btrfs_dir_ro_inode_operations = {
2903 .lookup = btrfs_lookup,
2906 static struct file_operations btrfs_dir_file_operations = {
2907 .llseek = generic_file_llseek,
2908 .read = generic_read_dir,
2909 .readdir = btrfs_readdir,
2910 .unlocked_ioctl = btrfs_ioctl,
2911 #ifdef CONFIG_COMPAT
2912 .compat_ioctl = btrfs_ioctl,
2916 static struct extent_map_ops btrfs_extent_map_ops = {
2917 .fill_delalloc = run_delalloc_range,
2918 .writepage_io_hook = btrfs_writepage_io_hook,
2919 .readpage_io_hook = btrfs_readpage_io_hook,
2920 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
2923 static struct address_space_operations btrfs_aops = {
2924 .readpage = btrfs_readpage,
2925 .writepage = btrfs_writepage,
2926 .writepages = btrfs_writepages,
2927 .readpages = btrfs_readpages,
2928 .sync_page = block_sync_page,
2929 .prepare_write = btrfs_prepare_write,
2930 .commit_write = btrfs_commit_write,
2932 .invalidatepage = btrfs_invalidatepage,
2933 .releasepage = btrfs_releasepage,
2934 .set_page_dirty = __set_page_dirty_nobuffers,
2937 static struct address_space_operations btrfs_symlink_aops = {
2938 .readpage = btrfs_readpage,
2939 .writepage = btrfs_writepage,
2940 .invalidatepage = btrfs_invalidatepage,
2941 .releasepage = btrfs_releasepage,
2944 static struct inode_operations btrfs_file_inode_operations = {
2945 .truncate = btrfs_truncate,
2946 .getattr = btrfs_getattr,
2947 .setattr = btrfs_setattr,
2948 .setxattr = generic_setxattr,
2949 .getxattr = generic_getxattr,
2950 .listxattr = btrfs_listxattr,
2951 .removexattr = generic_removexattr,
2954 static struct inode_operations btrfs_special_inode_operations = {
2955 .getattr = btrfs_getattr,
2956 .setattr = btrfs_setattr,
2959 static struct inode_operations btrfs_symlink_inode_operations = {
2960 .readlink = generic_readlink,
2961 .follow_link = page_follow_link_light,
2962 .put_link = page_put_link,