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_io_ops btrfs_extent_io_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);
92 spin_lock(&root->fs_info->delalloc_lock);
93 if (used + root->fs_info->delalloc_bytes + num_required > thresh)
95 spin_unlock(&root->fs_info->delalloc_lock);
99 static int cow_file_range(struct inode *inode, u64 start, u64 end)
101 struct btrfs_root *root = BTRFS_I(inode)->root;
102 struct btrfs_trans_handle *trans;
106 u64 blocksize = root->sectorsize;
107 u64 orig_start = start;
109 struct btrfs_key ins;
112 trans = btrfs_start_transaction(root, 1);
114 btrfs_set_trans_block_group(trans, inode);
116 num_bytes = (end - start + blocksize) & ~(blocksize - 1);
117 num_bytes = max(blocksize, num_bytes);
118 ret = btrfs_drop_extents(trans, root, inode,
119 start, start + num_bytes, start, &alloc_hint);
120 orig_num_bytes = num_bytes;
122 if (alloc_hint == EXTENT_MAP_INLINE)
125 while(num_bytes > 0) {
126 cur_alloc_size = min(num_bytes, root->fs_info->max_extent);
127 ret = btrfs_alloc_extent(trans, root, cur_alloc_size,
128 root->root_key.objectid,
130 inode->i_ino, start, 0,
131 alloc_hint, (u64)-1, &ins, 1);
136 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
137 start, ins.objectid, ins.offset,
139 btrfs_check_file(root, inode);
140 num_bytes -= cur_alloc_size;
141 alloc_hint = ins.objectid + ins.offset;
142 start += cur_alloc_size;
144 btrfs_drop_extent_cache(inode, orig_start,
145 orig_start + orig_num_bytes - 1);
146 btrfs_add_ordered_inode(inode);
148 btrfs_end_transaction(trans, root);
152 static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end)
160 struct btrfs_root *root = BTRFS_I(inode)->root;
161 struct extent_buffer *leaf;
163 struct btrfs_path *path;
164 struct btrfs_file_extent_item *item;
167 struct btrfs_key found_key;
169 total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
170 path = btrfs_alloc_path();
173 ret = btrfs_lookup_file_extent(NULL, root, path,
174 inode->i_ino, start, 0);
176 btrfs_free_path(path);
182 if (path->slots[0] == 0)
187 leaf = path->nodes[0];
188 item = btrfs_item_ptr(leaf, path->slots[0],
189 struct btrfs_file_extent_item);
191 /* are we inside the extent that was found? */
192 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
193 found_type = btrfs_key_type(&found_key);
194 if (found_key.objectid != inode->i_ino ||
195 found_type != BTRFS_EXTENT_DATA_KEY) {
199 found_type = btrfs_file_extent_type(leaf, item);
200 extent_start = found_key.offset;
201 if (found_type == BTRFS_FILE_EXTENT_REG) {
202 u64 extent_num_bytes;
204 extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item);
205 extent_end = extent_start + extent_num_bytes;
208 if (loops && start != extent_start)
211 if (start < extent_start || start >= extent_end)
214 cow_end = min(end, extent_end - 1);
215 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
220 * we may be called by the resizer, make sure we're inside
221 * the limits of the FS
223 if (bytenr + extent_num_bytes > total_fs_bytes)
226 if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) {
236 btrfs_free_path(path);
239 btrfs_release_path(root, path);
244 cow_file_range(inode, start, cow_end);
249 static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
251 struct btrfs_root *root = BTRFS_I(inode)->root;
254 mutex_lock(&root->fs_info->fs_mutex);
255 if (btrfs_test_opt(root, NODATACOW) ||
256 btrfs_test_flag(inode, NODATACOW))
257 ret = run_delalloc_nocow(inode, start, end);
259 ret = cow_file_range(inode, start, end);
261 spin_lock(&root->fs_info->delalloc_lock);
262 num_bytes = end + 1 - start;
263 if (root->fs_info->delalloc_bytes < num_bytes) {
264 printk("delalloc accounting error total %llu sub %llu\n",
265 root->fs_info->delalloc_bytes, num_bytes);
267 root->fs_info->delalloc_bytes -= num_bytes;
269 spin_unlock(&root->fs_info->delalloc_lock);
271 mutex_unlock(&root->fs_info->fs_mutex);
275 int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end)
277 struct inode *inode = page->mapping->host;
278 struct btrfs_root *root = BTRFS_I(inode)->root;
279 struct btrfs_trans_handle *trans;
282 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
283 size_t offset = start - page_start;
284 if (btrfs_test_opt(root, NODATASUM) ||
285 btrfs_test_flag(inode, NODATASUM))
287 mutex_lock(&root->fs_info->fs_mutex);
288 trans = btrfs_start_transaction(root, 1);
289 btrfs_set_trans_block_group(trans, inode);
291 btrfs_csum_file_block(trans, root, inode, inode->i_ino,
292 start, kaddr + offset, end - start + 1);
294 ret = btrfs_end_transaction(trans, root);
296 mutex_unlock(&root->fs_info->fs_mutex);
300 int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
303 struct inode *inode = page->mapping->host;
304 struct btrfs_root *root = BTRFS_I(inode)->root;
305 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
306 struct btrfs_csum_item *item;
307 struct btrfs_path *path = NULL;
309 if (btrfs_test_opt(root, NODATASUM) ||
310 btrfs_test_flag(inode, NODATASUM))
312 mutex_lock(&root->fs_info->fs_mutex);
313 path = btrfs_alloc_path();
314 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
317 /* a csum that isn't present is a preallocated region. */
318 if (ret == -ENOENT || ret == -EFBIG)
321 printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start);
324 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
326 set_state_private(io_tree, start, csum);
329 btrfs_free_path(path);
330 mutex_unlock(&root->fs_info->fs_mutex);
334 int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
335 struct extent_state *state)
337 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
338 struct inode *inode = page->mapping->host;
339 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
341 u64 private = ~(u32)0;
343 struct btrfs_root *root = BTRFS_I(inode)->root;
347 if (btrfs_test_opt(root, NODATASUM) ||
348 btrfs_test_flag(inode, NODATASUM))
351 if (state->start == start) {
352 private = state->private;
355 ret = get_state_private(io_tree, start, &private);
357 local_irq_save(flags);
358 kaddr = kmap_atomic(page, KM_IRQ0);
362 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
363 btrfs_csum_final(csum, (char *)&csum);
364 if (csum != private) {
367 kunmap_atomic(kaddr, KM_IRQ0);
368 local_irq_restore(flags);
372 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
373 page->mapping->host->i_ino, (unsigned long long)start, csum,
375 memset(kaddr + offset, 1, end - start + 1);
376 flush_dcache_page(page);
377 kunmap_atomic(kaddr, KM_IRQ0);
378 local_irq_restore(flags);
382 void btrfs_read_locked_inode(struct inode *inode)
384 struct btrfs_path *path;
385 struct extent_buffer *leaf;
386 struct btrfs_inode_item *inode_item;
387 struct btrfs_inode_timespec *tspec;
388 struct btrfs_root *root = BTRFS_I(inode)->root;
389 struct btrfs_key location;
390 u64 alloc_group_block;
394 path = btrfs_alloc_path();
396 mutex_lock(&root->fs_info->fs_mutex);
397 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
399 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
403 leaf = path->nodes[0];
404 inode_item = btrfs_item_ptr(leaf, path->slots[0],
405 struct btrfs_inode_item);
407 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
408 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
409 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
410 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
411 inode->i_size = btrfs_inode_size(leaf, inode_item);
413 tspec = btrfs_inode_atime(inode_item);
414 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
415 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
417 tspec = btrfs_inode_mtime(inode_item);
418 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
419 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
421 tspec = btrfs_inode_ctime(inode_item);
422 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
423 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
425 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
426 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
428 rdev = btrfs_inode_rdev(leaf, inode_item);
430 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
431 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
433 BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
434 if (!BTRFS_I(inode)->block_group) {
435 BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
438 btrfs_free_path(path);
441 mutex_unlock(&root->fs_info->fs_mutex);
443 switch (inode->i_mode & S_IFMT) {
445 inode->i_mapping->a_ops = &btrfs_aops;
446 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
447 inode->i_fop = &btrfs_file_operations;
448 inode->i_op = &btrfs_file_inode_operations;
451 inode->i_fop = &btrfs_dir_file_operations;
452 if (root == root->fs_info->tree_root)
453 inode->i_op = &btrfs_dir_ro_inode_operations;
455 inode->i_op = &btrfs_dir_inode_operations;
458 inode->i_op = &btrfs_symlink_inode_operations;
459 inode->i_mapping->a_ops = &btrfs_symlink_aops;
462 init_special_inode(inode, inode->i_mode, rdev);
468 btrfs_release_path(root, path);
469 btrfs_free_path(path);
470 mutex_unlock(&root->fs_info->fs_mutex);
471 make_bad_inode(inode);
474 static void fill_inode_item(struct extent_buffer *leaf,
475 struct btrfs_inode_item *item,
478 btrfs_set_inode_uid(leaf, item, inode->i_uid);
479 btrfs_set_inode_gid(leaf, item, inode->i_gid);
480 btrfs_set_inode_size(leaf, item, inode->i_size);
481 btrfs_set_inode_mode(leaf, item, inode->i_mode);
482 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
484 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
485 inode->i_atime.tv_sec);
486 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
487 inode->i_atime.tv_nsec);
489 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
490 inode->i_mtime.tv_sec);
491 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
492 inode->i_mtime.tv_nsec);
494 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
495 inode->i_ctime.tv_sec);
496 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
497 inode->i_ctime.tv_nsec);
499 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
500 btrfs_set_inode_generation(leaf, item, inode->i_generation);
501 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
502 btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
503 btrfs_set_inode_block_group(leaf, item,
504 BTRFS_I(inode)->block_group->key.objectid);
507 int btrfs_update_inode(struct btrfs_trans_handle *trans,
508 struct btrfs_root *root,
511 struct btrfs_inode_item *inode_item;
512 struct btrfs_path *path;
513 struct extent_buffer *leaf;
516 path = btrfs_alloc_path();
518 ret = btrfs_lookup_inode(trans, root, path,
519 &BTRFS_I(inode)->location, 1);
526 leaf = path->nodes[0];
527 inode_item = btrfs_item_ptr(leaf, path->slots[0],
528 struct btrfs_inode_item);
530 fill_inode_item(leaf, inode_item, inode);
531 btrfs_mark_buffer_dirty(leaf);
532 btrfs_set_inode_last_trans(trans, inode);
535 btrfs_release_path(root, path);
536 btrfs_free_path(path);
541 static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
542 struct btrfs_root *root,
544 struct dentry *dentry)
546 struct btrfs_path *path;
547 const char *name = dentry->d_name.name;
548 int name_len = dentry->d_name.len;
550 struct extent_buffer *leaf;
551 struct btrfs_dir_item *di;
552 struct btrfs_key key;
554 path = btrfs_alloc_path();
560 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
570 leaf = path->nodes[0];
571 btrfs_dir_item_key_to_cpu(leaf, di, &key);
572 ret = btrfs_delete_one_dir_name(trans, root, path, di);
575 btrfs_release_path(root, path);
577 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
578 key.objectid, name, name_len, -1);
587 ret = btrfs_delete_one_dir_name(trans, root, path, di);
589 dentry->d_inode->i_ctime = dir->i_ctime;
590 ret = btrfs_del_inode_ref(trans, root, name, name_len,
591 dentry->d_inode->i_ino,
592 dentry->d_parent->d_inode->i_ino);
594 printk("failed to delete reference to %.*s, "
595 "inode %lu parent %lu\n", name_len, name,
596 dentry->d_inode->i_ino,
597 dentry->d_parent->d_inode->i_ino);
600 btrfs_free_path(path);
602 dir->i_size -= name_len * 2;
603 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
604 btrfs_update_inode(trans, root, dir);
605 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
606 dentry->d_inode->i_nlink--;
608 drop_nlink(dentry->d_inode);
610 ret = btrfs_update_inode(trans, root, dentry->d_inode);
611 dir->i_sb->s_dirt = 1;
616 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
618 struct btrfs_root *root;
619 struct btrfs_trans_handle *trans;
620 struct inode *inode = dentry->d_inode;
622 unsigned long nr = 0;
624 root = BTRFS_I(dir)->root;
625 mutex_lock(&root->fs_info->fs_mutex);
627 ret = btrfs_check_free_space(root, 1, 1);
631 trans = btrfs_start_transaction(root, 1);
633 btrfs_set_trans_block_group(trans, dir);
634 ret = btrfs_unlink_trans(trans, root, dir, dentry);
635 nr = trans->blocks_used;
637 if (inode->i_nlink == 0) {
639 /* if the inode isn't linked anywhere,
640 * we don't need to worry about
643 found = btrfs_del_ordered_inode(inode);
645 atomic_dec(&inode->i_count);
649 btrfs_end_transaction(trans, root);
651 mutex_unlock(&root->fs_info->fs_mutex);
652 btrfs_btree_balance_dirty(root, nr);
653 btrfs_throttle(root);
657 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
659 struct inode *inode = dentry->d_inode;
662 struct btrfs_root *root = BTRFS_I(dir)->root;
663 struct btrfs_trans_handle *trans;
664 unsigned long nr = 0;
666 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
669 mutex_lock(&root->fs_info->fs_mutex);
670 ret = btrfs_check_free_space(root, 1, 1);
674 trans = btrfs_start_transaction(root, 1);
675 btrfs_set_trans_block_group(trans, dir);
677 /* now the directory is empty */
678 err = btrfs_unlink_trans(trans, root, dir, dentry);
683 nr = trans->blocks_used;
684 ret = btrfs_end_transaction(trans, root);
686 mutex_unlock(&root->fs_info->fs_mutex);
687 btrfs_btree_balance_dirty(root, nr);
688 btrfs_throttle(root);
696 * this can truncate away extent items, csum items and directory items.
697 * It starts at a high offset and removes keys until it can't find
698 * any higher than i_size.
700 * csum items that cross the new i_size are truncated to the new size
703 static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
704 struct btrfs_root *root,
709 struct btrfs_path *path;
710 struct btrfs_key key;
711 struct btrfs_key found_key;
713 struct extent_buffer *leaf;
714 struct btrfs_file_extent_item *fi;
715 u64 extent_start = 0;
716 u64 extent_num_bytes = 0;
722 int pending_del_nr = 0;
723 int pending_del_slot = 0;
724 int extent_type = -1;
726 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
727 path = btrfs_alloc_path();
731 /* FIXME, add redo link to tree so we don't leak on crash */
732 key.objectid = inode->i_ino;
733 key.offset = (u64)-1;
736 btrfs_init_path(path);
738 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
743 BUG_ON(path->slots[0] == 0);
749 leaf = path->nodes[0];
750 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
751 found_type = btrfs_key_type(&found_key);
753 if (found_key.objectid != inode->i_ino)
756 if (found_type < min_type)
759 item_end = found_key.offset;
760 if (found_type == BTRFS_EXTENT_DATA_KEY) {
761 fi = btrfs_item_ptr(leaf, path->slots[0],
762 struct btrfs_file_extent_item);
763 extent_type = btrfs_file_extent_type(leaf, fi);
764 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
766 btrfs_file_extent_num_bytes(leaf, fi);
767 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
768 struct btrfs_item *item = btrfs_item_nr(leaf,
770 item_end += btrfs_file_extent_inline_len(leaf,
775 if (found_type == BTRFS_CSUM_ITEM_KEY) {
776 ret = btrfs_csum_truncate(trans, root, path,
780 if (item_end < inode->i_size) {
781 if (found_type == BTRFS_DIR_ITEM_KEY) {
782 found_type = BTRFS_INODE_ITEM_KEY;
783 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
784 found_type = BTRFS_CSUM_ITEM_KEY;
785 } else if (found_type == BTRFS_EXTENT_DATA_KEY) {
786 found_type = BTRFS_XATTR_ITEM_KEY;
787 } else if (found_type == BTRFS_XATTR_ITEM_KEY) {
788 found_type = BTRFS_INODE_REF_KEY;
789 } else if (found_type) {
794 btrfs_set_key_type(&key, found_type);
797 if (found_key.offset >= inode->i_size)
803 /* FIXME, shrink the extent if the ref count is only 1 */
804 if (found_type != BTRFS_EXTENT_DATA_KEY)
807 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
809 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
812 btrfs_file_extent_num_bytes(leaf, fi);
813 extent_num_bytes = inode->i_size -
814 found_key.offset + root->sectorsize - 1;
815 btrfs_set_file_extent_num_bytes(leaf, fi,
817 num_dec = (orig_num_bytes -
818 extent_num_bytes) >> 9;
819 if (extent_start != 0) {
820 inode->i_blocks -= num_dec;
822 btrfs_mark_buffer_dirty(leaf);
825 btrfs_file_extent_disk_num_bytes(leaf,
827 /* FIXME blocksize != 4096 */
828 num_dec = btrfs_file_extent_num_bytes(leaf,
830 if (extent_start != 0) {
832 inode->i_blocks -= num_dec;
834 root_gen = btrfs_header_generation(leaf);
835 root_owner = btrfs_header_owner(leaf);
837 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE &&
839 u32 newsize = inode->i_size - found_key.offset;
840 newsize = btrfs_file_extent_calc_inline_size(newsize);
841 ret = btrfs_truncate_item(trans, root, path,
847 if (!pending_del_nr) {
848 /* no pending yet, add ourselves */
849 pending_del_slot = path->slots[0];
851 } else if (pending_del_nr &&
852 path->slots[0] + 1 == pending_del_slot) {
853 /* hop on the pending chunk */
855 pending_del_slot = path->slots[0];
857 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot);
863 ret = btrfs_free_extent(trans, root, extent_start,
866 root_gen, inode->i_ino,
867 found_key.offset, 0);
871 if (path->slots[0] == 0) {
874 btrfs_release_path(root, path);
879 if (pending_del_nr &&
880 path->slots[0] + 1 != pending_del_slot) {
881 struct btrfs_key debug;
883 btrfs_item_key_to_cpu(path->nodes[0], &debug,
885 ret = btrfs_del_items(trans, root, path,
890 btrfs_release_path(root, path);
896 if (pending_del_nr) {
897 ret = btrfs_del_items(trans, root, path, pending_del_slot,
900 btrfs_release_path(root, path);
901 btrfs_free_path(path);
902 inode->i_sb->s_dirt = 1;
906 static int btrfs_cow_one_page(struct inode *inode, struct page *page,
910 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
911 struct btrfs_root *root = BTRFS_I(inode)->root;
912 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
913 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
914 u64 existing_delalloc;
918 WARN_ON(!PageLocked(page));
919 set_page_extent_mapped(page);
921 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
922 delalloc_start = page_start;
923 existing_delalloc = count_range_bits(&BTRFS_I(inode)->io_tree,
924 &delalloc_start, page_end,
925 PAGE_CACHE_SIZE, EXTENT_DELALLOC);
926 set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start,
929 spin_lock(&root->fs_info->delalloc_lock);
930 root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE - existing_delalloc;
931 spin_unlock(&root->fs_info->delalloc_lock);
933 if (zero_start != PAGE_CACHE_SIZE) {
935 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
936 flush_dcache_page(page);
939 set_page_dirty(page);
940 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
946 * taken from block_truncate_page, but does cow as it zeros out
947 * any bytes left in the last page in the file.
949 static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
951 struct inode *inode = mapping->host;
952 struct btrfs_root *root = BTRFS_I(inode)->root;
953 u32 blocksize = root->sectorsize;
954 pgoff_t index = from >> PAGE_CACHE_SHIFT;
955 unsigned offset = from & (PAGE_CACHE_SIZE-1);
960 if ((offset & (blocksize - 1)) == 0)
964 page = grab_cache_page(mapping, index);
967 if (!PageUptodate(page)) {
968 ret = btrfs_readpage(NULL, page);
970 if (!PageUptodate(page)) {
975 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
977 ret = btrfs_cow_one_page(inode, page, offset);
980 page_cache_release(page);
985 static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
987 struct inode *inode = dentry->d_inode;
990 err = inode_change_ok(inode, attr);
994 if (S_ISREG(inode->i_mode) &&
995 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
996 struct btrfs_trans_handle *trans;
997 struct btrfs_root *root = BTRFS_I(inode)->root;
998 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1000 u64 mask = root->sectorsize - 1;
1001 u64 pos = (inode->i_size + mask) & ~mask;
1002 u64 block_end = attr->ia_size | mask;
1007 if (attr->ia_size <= pos)
1010 if (pos != inode->i_size)
1011 hole_start = pos + root->sectorsize;
1015 mutex_lock(&root->fs_info->fs_mutex);
1016 err = btrfs_check_free_space(root, 1, 0);
1017 mutex_unlock(&root->fs_info->fs_mutex);
1021 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1023 lock_extent(io_tree, pos, block_end, GFP_NOFS);
1024 hole_size = block_end - hole_start;
1026 mutex_lock(&root->fs_info->fs_mutex);
1027 trans = btrfs_start_transaction(root, 1);
1028 btrfs_set_trans_block_group(trans, inode);
1029 err = btrfs_drop_extents(trans, root, inode,
1030 pos, block_end, pos,
1033 if (alloc_hint != EXTENT_MAP_INLINE) {
1034 err = btrfs_insert_file_extent(trans, root,
1038 btrfs_drop_extent_cache(inode, hole_start,
1040 btrfs_check_file(root, inode);
1042 btrfs_end_transaction(trans, root);
1043 mutex_unlock(&root->fs_info->fs_mutex);
1044 unlock_extent(io_tree, pos, block_end, GFP_NOFS);
1049 err = inode_setattr(inode, attr);
1054 void btrfs_put_inode(struct inode *inode)
1058 if (!BTRFS_I(inode)->ordered_trans) {
1062 if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
1063 mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))
1066 ret = btrfs_del_ordered_inode(inode);
1068 atomic_dec(&inode->i_count);
1072 void btrfs_delete_inode(struct inode *inode)
1074 struct btrfs_trans_handle *trans;
1075 struct btrfs_root *root = BTRFS_I(inode)->root;
1079 truncate_inode_pages(&inode->i_data, 0);
1080 if (is_bad_inode(inode)) {
1085 mutex_lock(&root->fs_info->fs_mutex);
1086 trans = btrfs_start_transaction(root, 1);
1088 btrfs_set_trans_block_group(trans, inode);
1089 ret = btrfs_truncate_in_trans(trans, root, inode, 0);
1091 goto no_delete_lock;
1093 nr = trans->blocks_used;
1096 btrfs_end_transaction(trans, root);
1097 mutex_unlock(&root->fs_info->fs_mutex);
1098 btrfs_btree_balance_dirty(root, nr);
1099 btrfs_throttle(root);
1103 nr = trans->blocks_used;
1104 btrfs_end_transaction(trans, root);
1105 mutex_unlock(&root->fs_info->fs_mutex);
1106 btrfs_btree_balance_dirty(root, nr);
1107 btrfs_throttle(root);
1113 * this returns the key found in the dir entry in the location pointer.
1114 * If no dir entries were found, location->objectid is 0.
1116 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1117 struct btrfs_key *location)
1119 const char *name = dentry->d_name.name;
1120 int namelen = dentry->d_name.len;
1121 struct btrfs_dir_item *di;
1122 struct btrfs_path *path;
1123 struct btrfs_root *root = BTRFS_I(dir)->root;
1126 if (namelen == 1 && strcmp(name, ".") == 0) {
1127 location->objectid = dir->i_ino;
1128 location->type = BTRFS_INODE_ITEM_KEY;
1129 location->offset = 0;
1132 path = btrfs_alloc_path();
1135 if (namelen == 2 && strcmp(name, "..") == 0) {
1136 struct btrfs_key key;
1137 struct extent_buffer *leaf;
1141 key.objectid = dir->i_ino;
1142 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1144 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1148 leaf = path->nodes[0];
1149 slot = path->slots[0];
1150 nritems = btrfs_header_nritems(leaf);
1151 if (slot >= nritems)
1154 btrfs_item_key_to_cpu(leaf, &key, slot);
1155 if (key.objectid != dir->i_ino ||
1156 key.type != BTRFS_INODE_REF_KEY) {
1159 location->objectid = key.offset;
1160 location->type = BTRFS_INODE_ITEM_KEY;
1161 location->offset = 0;
1165 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1169 if (!di || IS_ERR(di)) {
1172 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
1174 btrfs_free_path(path);
1177 location->objectid = 0;
1182 * when we hit a tree root in a directory, the btrfs part of the inode
1183 * needs to be changed to reflect the root directory of the tree root. This
1184 * is kind of like crossing a mount point.
1186 static int fixup_tree_root_location(struct btrfs_root *root,
1187 struct btrfs_key *location,
1188 struct btrfs_root **sub_root,
1189 struct dentry *dentry)
1191 struct btrfs_path *path;
1192 struct btrfs_root_item *ri;
1194 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1196 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1199 path = btrfs_alloc_path();
1201 mutex_lock(&root->fs_info->fs_mutex);
1203 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1204 dentry->d_name.name,
1205 dentry->d_name.len);
1206 if (IS_ERR(*sub_root))
1207 return PTR_ERR(*sub_root);
1209 ri = &(*sub_root)->root_item;
1210 location->objectid = btrfs_root_dirid(ri);
1211 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1212 location->offset = 0;
1214 btrfs_free_path(path);
1215 mutex_unlock(&root->fs_info->fs_mutex);
1219 static int btrfs_init_locked_inode(struct inode *inode, void *p)
1221 struct btrfs_iget_args *args = p;
1222 inode->i_ino = args->ino;
1223 BTRFS_I(inode)->root = args->root;
1224 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1225 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1226 inode->i_mapping, GFP_NOFS);
1230 static int btrfs_find_actor(struct inode *inode, void *opaque)
1232 struct btrfs_iget_args *args = opaque;
1233 return (args->ino == inode->i_ino &&
1234 args->root == BTRFS_I(inode)->root);
1237 struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1240 struct btrfs_iget_args args;
1241 args.ino = objectid;
1242 args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);
1247 return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
1250 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1251 struct btrfs_root *root)
1253 struct inode *inode;
1254 struct btrfs_iget_args args;
1255 args.ino = objectid;
1258 inode = iget5_locked(s, objectid, btrfs_find_actor,
1259 btrfs_init_locked_inode,
1264 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1265 struct nameidata *nd)
1267 struct inode * inode;
1268 struct btrfs_inode *bi = BTRFS_I(dir);
1269 struct btrfs_root *root = bi->root;
1270 struct btrfs_root *sub_root = root;
1271 struct btrfs_key location;
1274 if (dentry->d_name.len > BTRFS_NAME_LEN)
1275 return ERR_PTR(-ENAMETOOLONG);
1277 mutex_lock(&root->fs_info->fs_mutex);
1278 ret = btrfs_inode_by_name(dir, dentry, &location);
1279 mutex_unlock(&root->fs_info->fs_mutex);
1282 return ERR_PTR(ret);
1285 if (location.objectid) {
1286 ret = fixup_tree_root_location(root, &location, &sub_root,
1289 return ERR_PTR(ret);
1291 return ERR_PTR(-ENOENT);
1292 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1295 return ERR_PTR(-EACCES);
1296 if (inode->i_state & I_NEW) {
1297 /* the inode and parent dir are two different roots */
1298 if (sub_root != root) {
1300 sub_root->inode = inode;
1302 BTRFS_I(inode)->root = sub_root;
1303 memcpy(&BTRFS_I(inode)->location, &location,
1305 btrfs_read_locked_inode(inode);
1306 unlock_new_inode(inode);
1309 return d_splice_alias(inode, dentry);
1312 static unsigned char btrfs_filetype_table[] = {
1313 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1316 static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1318 struct inode *inode = filp->f_dentry->d_inode;
1319 struct btrfs_root *root = BTRFS_I(inode)->root;
1320 struct btrfs_item *item;
1321 struct btrfs_dir_item *di;
1322 struct btrfs_key key;
1323 struct btrfs_key found_key;
1324 struct btrfs_path *path;
1327 struct extent_buffer *leaf;
1330 unsigned char d_type;
1335 int key_type = BTRFS_DIR_INDEX_KEY;
1340 /* FIXME, use a real flag for deciding about the key type */
1341 if (root->fs_info->tree_root == root)
1342 key_type = BTRFS_DIR_ITEM_KEY;
1344 /* special case for "." */
1345 if (filp->f_pos == 0) {
1346 over = filldir(dirent, ".", 1,
1354 mutex_lock(&root->fs_info->fs_mutex);
1355 key.objectid = inode->i_ino;
1356 path = btrfs_alloc_path();
1359 /* special case for .., just use the back ref */
1360 if (filp->f_pos == 1) {
1361 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1363 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1365 leaf = path->nodes[0];
1366 slot = path->slots[0];
1367 nritems = btrfs_header_nritems(leaf);
1368 if (slot >= nritems) {
1369 btrfs_release_path(root, path);
1370 goto read_dir_items;
1372 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1373 btrfs_release_path(root, path);
1374 if (found_key.objectid != key.objectid ||
1375 found_key.type != BTRFS_INODE_REF_KEY)
1376 goto read_dir_items;
1377 over = filldir(dirent, "..", 2,
1378 2, found_key.offset, DT_DIR);
1385 btrfs_set_key_type(&key, key_type);
1386 key.offset = filp->f_pos;
1388 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1393 leaf = path->nodes[0];
1394 nritems = btrfs_header_nritems(leaf);
1395 slot = path->slots[0];
1396 if (advance || slot >= nritems) {
1397 if (slot >= nritems -1) {
1398 ret = btrfs_next_leaf(root, path);
1401 leaf = path->nodes[0];
1402 nritems = btrfs_header_nritems(leaf);
1403 slot = path->slots[0];
1410 item = btrfs_item_nr(leaf, slot);
1411 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1413 if (found_key.objectid != key.objectid)
1415 if (btrfs_key_type(&found_key) != key_type)
1417 if (found_key.offset < filp->f_pos)
1420 filp->f_pos = found_key.offset;
1422 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1424 di_total = btrfs_item_size(leaf, item);
1425 while(di_cur < di_total) {
1426 struct btrfs_key location;
1428 name_len = btrfs_dir_name_len(leaf, di);
1429 if (name_len < 32) {
1430 name_ptr = tmp_name;
1432 name_ptr = kmalloc(name_len, GFP_NOFS);
1435 read_extent_buffer(leaf, name_ptr,
1436 (unsigned long)(di + 1), name_len);
1438 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1439 btrfs_dir_item_key_to_cpu(leaf, di, &location);
1440 over = filldir(dirent, name_ptr, name_len,
1445 if (name_ptr != tmp_name)
1450 di_len = btrfs_dir_name_len(leaf, di) +
1451 btrfs_dir_data_len(leaf, di) +sizeof(*di);
1453 di = (struct btrfs_dir_item *)((char *)di + di_len);
1456 filp->f_pos = INT_LIMIT(typeof(filp->f_pos));
1460 btrfs_release_path(root, path);
1461 btrfs_free_path(path);
1462 mutex_unlock(&root->fs_info->fs_mutex);
1466 int btrfs_write_inode(struct inode *inode, int wait)
1468 struct btrfs_root *root = BTRFS_I(inode)->root;
1469 struct btrfs_trans_handle *trans;
1473 mutex_lock(&root->fs_info->fs_mutex);
1474 trans = btrfs_start_transaction(root, 1);
1475 btrfs_set_trans_block_group(trans, inode);
1476 ret = btrfs_commit_transaction(trans, root);
1477 mutex_unlock(&root->fs_info->fs_mutex);
1483 * This is somewhat expensive, updating the tree every time the
1484 * inode changes. But, it is most likely to find the inode in cache.
1485 * FIXME, needs more benchmarking...there are no reasons other than performance
1486 * to keep or drop this code.
1488 void btrfs_dirty_inode(struct inode *inode)
1490 struct btrfs_root *root = BTRFS_I(inode)->root;
1491 struct btrfs_trans_handle *trans;
1493 mutex_lock(&root->fs_info->fs_mutex);
1494 trans = btrfs_start_transaction(root, 1);
1495 btrfs_set_trans_block_group(trans, inode);
1496 btrfs_update_inode(trans, root, inode);
1497 btrfs_end_transaction(trans, root);
1498 mutex_unlock(&root->fs_info->fs_mutex);
1501 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1502 struct btrfs_root *root,
1504 struct btrfs_block_group_cache *group,
1507 struct inode *inode;
1508 struct btrfs_inode_item *inode_item;
1509 struct btrfs_key *location;
1510 struct btrfs_path *path;
1514 path = btrfs_alloc_path();
1517 inode = new_inode(root->fs_info->sb);
1519 return ERR_PTR(-ENOMEM);
1521 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1522 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1523 inode->i_mapping, GFP_NOFS);
1524 BTRFS_I(inode)->root = root;
1530 group = btrfs_find_block_group(root, group, 0, 0, owner);
1531 BTRFS_I(inode)->block_group = group;
1532 BTRFS_I(inode)->flags = 0;
1533 ret = btrfs_insert_empty_inode(trans, root, path, objectid);
1537 inode->i_uid = current->fsuid;
1538 inode->i_gid = current->fsgid;
1539 inode->i_mode = mode;
1540 inode->i_ino = objectid;
1541 inode->i_blocks = 0;
1542 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1543 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1544 struct btrfs_inode_item);
1545 fill_inode_item(path->nodes[0], inode_item, inode);
1546 btrfs_mark_buffer_dirty(path->nodes[0]);
1547 btrfs_free_path(path);
1549 location = &BTRFS_I(inode)->location;
1550 location->objectid = objectid;
1551 location->offset = 0;
1552 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1554 insert_inode_hash(inode);
1557 btrfs_free_path(path);
1558 return ERR_PTR(ret);
1561 static inline u8 btrfs_inode_type(struct inode *inode)
1563 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1566 static int btrfs_add_link(struct btrfs_trans_handle *trans,
1567 struct dentry *dentry, struct inode *inode)
1570 struct btrfs_key key;
1571 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
1572 struct inode *parent_inode;
1574 key.objectid = inode->i_ino;
1575 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1578 ret = btrfs_insert_dir_item(trans, root,
1579 dentry->d_name.name, dentry->d_name.len,
1580 dentry->d_parent->d_inode->i_ino,
1581 &key, btrfs_inode_type(inode));
1583 ret = btrfs_insert_inode_ref(trans, root,
1584 dentry->d_name.name,
1587 dentry->d_parent->d_inode->i_ino);
1588 parent_inode = dentry->d_parent->d_inode;
1589 parent_inode->i_size += dentry->d_name.len * 2;
1590 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
1591 ret = btrfs_update_inode(trans, root,
1592 dentry->d_parent->d_inode);
1597 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1598 struct dentry *dentry, struct inode *inode)
1600 int err = btrfs_add_link(trans, dentry, inode);
1602 d_instantiate(dentry, inode);
1610 static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1611 int mode, dev_t rdev)
1613 struct btrfs_trans_handle *trans;
1614 struct btrfs_root *root = BTRFS_I(dir)->root;
1615 struct inode *inode = NULL;
1619 unsigned long nr = 0;
1621 if (!new_valid_dev(rdev))
1624 mutex_lock(&root->fs_info->fs_mutex);
1625 err = btrfs_check_free_space(root, 1, 0);
1629 trans = btrfs_start_transaction(root, 1);
1630 btrfs_set_trans_block_group(trans, dir);
1632 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1638 inode = btrfs_new_inode(trans, root, objectid,
1639 BTRFS_I(dir)->block_group, mode);
1640 err = PTR_ERR(inode);
1644 btrfs_set_trans_block_group(trans, inode);
1645 err = btrfs_add_nondir(trans, dentry, inode);
1649 inode->i_op = &btrfs_special_inode_operations;
1650 init_special_inode(inode, inode->i_mode, rdev);
1651 btrfs_update_inode(trans, root, inode);
1653 dir->i_sb->s_dirt = 1;
1654 btrfs_update_inode_block_group(trans, inode);
1655 btrfs_update_inode_block_group(trans, dir);
1657 nr = trans->blocks_used;
1658 btrfs_end_transaction(trans, root);
1660 mutex_unlock(&root->fs_info->fs_mutex);
1663 inode_dec_link_count(inode);
1666 btrfs_btree_balance_dirty(root, nr);
1667 btrfs_throttle(root);
1671 static int btrfs_create(struct inode *dir, struct dentry *dentry,
1672 int mode, struct nameidata *nd)
1674 struct btrfs_trans_handle *trans;
1675 struct btrfs_root *root = BTRFS_I(dir)->root;
1676 struct inode *inode = NULL;
1679 unsigned long nr = 0;
1682 mutex_lock(&root->fs_info->fs_mutex);
1683 err = btrfs_check_free_space(root, 1, 0);
1686 trans = btrfs_start_transaction(root, 1);
1687 btrfs_set_trans_block_group(trans, dir);
1689 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1695 inode = btrfs_new_inode(trans, root, objectid,
1696 BTRFS_I(dir)->block_group, mode);
1697 err = PTR_ERR(inode);
1701 btrfs_set_trans_block_group(trans, inode);
1702 err = btrfs_add_nondir(trans, dentry, inode);
1706 inode->i_mapping->a_ops = &btrfs_aops;
1707 inode->i_fop = &btrfs_file_operations;
1708 inode->i_op = &btrfs_file_inode_operations;
1709 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1710 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1711 inode->i_mapping, GFP_NOFS);
1712 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
1714 dir->i_sb->s_dirt = 1;
1715 btrfs_update_inode_block_group(trans, inode);
1716 btrfs_update_inode_block_group(trans, dir);
1718 nr = trans->blocks_used;
1719 btrfs_end_transaction(trans, root);
1721 mutex_unlock(&root->fs_info->fs_mutex);
1724 inode_dec_link_count(inode);
1727 btrfs_btree_balance_dirty(root, nr);
1728 btrfs_throttle(root);
1732 static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1733 struct dentry *dentry)
1735 struct btrfs_trans_handle *trans;
1736 struct btrfs_root *root = BTRFS_I(dir)->root;
1737 struct inode *inode = old_dentry->d_inode;
1738 unsigned long nr = 0;
1742 if (inode->i_nlink == 0)
1745 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1750 mutex_lock(&root->fs_info->fs_mutex);
1751 err = btrfs_check_free_space(root, 1, 0);
1754 trans = btrfs_start_transaction(root, 1);
1756 btrfs_set_trans_block_group(trans, dir);
1757 atomic_inc(&inode->i_count);
1758 err = btrfs_add_nondir(trans, dentry, inode);
1763 dir->i_sb->s_dirt = 1;
1764 btrfs_update_inode_block_group(trans, dir);
1765 err = btrfs_update_inode(trans, root, inode);
1770 nr = trans->blocks_used;
1771 btrfs_end_transaction(trans, root);
1773 mutex_unlock(&root->fs_info->fs_mutex);
1776 inode_dec_link_count(inode);
1779 btrfs_btree_balance_dirty(root, nr);
1780 btrfs_throttle(root);
1784 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1786 struct inode *inode;
1787 struct btrfs_trans_handle *trans;
1788 struct btrfs_root *root = BTRFS_I(dir)->root;
1790 int drop_on_err = 0;
1792 unsigned long nr = 1;
1794 mutex_lock(&root->fs_info->fs_mutex);
1795 err = btrfs_check_free_space(root, 1, 0);
1799 trans = btrfs_start_transaction(root, 1);
1800 btrfs_set_trans_block_group(trans, dir);
1802 if (IS_ERR(trans)) {
1803 err = PTR_ERR(trans);
1807 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1813 inode = btrfs_new_inode(trans, root, objectid,
1814 BTRFS_I(dir)->block_group, S_IFDIR | mode);
1815 if (IS_ERR(inode)) {
1816 err = PTR_ERR(inode);
1821 inode->i_op = &btrfs_dir_inode_operations;
1822 inode->i_fop = &btrfs_dir_file_operations;
1823 btrfs_set_trans_block_group(trans, inode);
1826 err = btrfs_update_inode(trans, root, inode);
1830 err = btrfs_add_link(trans, dentry, inode);
1834 d_instantiate(dentry, inode);
1836 dir->i_sb->s_dirt = 1;
1837 btrfs_update_inode_block_group(trans, inode);
1838 btrfs_update_inode_block_group(trans, dir);
1841 nr = trans->blocks_used;
1842 btrfs_end_transaction(trans, root);
1845 mutex_unlock(&root->fs_info->fs_mutex);
1848 btrfs_btree_balance_dirty(root, nr);
1849 btrfs_throttle(root);
1853 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1854 size_t pg_offset, u64 start, u64 len,
1860 u64 extent_start = 0;
1862 u64 objectid = inode->i_ino;
1864 struct btrfs_path *path;
1865 struct btrfs_root *root = BTRFS_I(inode)->root;
1866 struct btrfs_file_extent_item *item;
1867 struct extent_buffer *leaf;
1868 struct btrfs_key found_key;
1869 struct extent_map *em = NULL;
1870 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1871 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1872 struct btrfs_trans_handle *trans = NULL;
1874 path = btrfs_alloc_path();
1876 mutex_lock(&root->fs_info->fs_mutex);
1879 spin_lock(&em_tree->lock);
1880 em = lookup_extent_mapping(em_tree, start, len);
1881 spin_unlock(&em_tree->lock);
1884 if (em->start > start) {
1885 printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n",
1886 start, len, em->start, em->len);
1889 if (em->block_start == EXTENT_MAP_INLINE && page)
1890 free_extent_map(em);
1894 em = alloc_extent_map(GFP_NOFS);
1900 em->start = EXTENT_MAP_HOLE;
1902 em->bdev = inode->i_sb->s_bdev;
1903 ret = btrfs_lookup_file_extent(trans, root, path,
1904 objectid, start, trans != NULL);
1911 if (path->slots[0] == 0)
1916 leaf = path->nodes[0];
1917 item = btrfs_item_ptr(leaf, path->slots[0],
1918 struct btrfs_file_extent_item);
1919 /* are we inside the extent that was found? */
1920 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1921 found_type = btrfs_key_type(&found_key);
1922 if (found_key.objectid != objectid ||
1923 found_type != BTRFS_EXTENT_DATA_KEY) {
1927 found_type = btrfs_file_extent_type(leaf, item);
1928 extent_start = found_key.offset;
1929 if (found_type == BTRFS_FILE_EXTENT_REG) {
1930 extent_end = extent_start +
1931 btrfs_file_extent_num_bytes(leaf, item);
1933 if (start < extent_start || start >= extent_end) {
1935 if (start < extent_start) {
1936 if (start + len <= extent_start)
1938 em->len = extent_end - extent_start;
1944 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
1946 em->start = extent_start;
1947 em->len = extent_end - extent_start;
1948 em->block_start = EXTENT_MAP_HOLE;
1951 bytenr += btrfs_file_extent_offset(leaf, item);
1952 em->block_start = bytenr;
1953 em->start = extent_start;
1954 em->len = extent_end - extent_start;
1956 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
1961 size_t extent_offset;
1964 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
1966 extent_end = (extent_start + size + root->sectorsize - 1) &
1967 ~((u64)root->sectorsize - 1);
1968 if (start < extent_start || start >= extent_end) {
1970 if (start < extent_start) {
1971 if (start + len <= extent_start)
1973 em->len = extent_end - extent_start;
1979 em->block_start = EXTENT_MAP_INLINE;
1982 em->start = extent_start;
1987 page_start = page_offset(page) + pg_offset;
1988 extent_offset = page_start - extent_start;
1989 copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
1990 size - extent_offset);
1991 em->start = extent_start + extent_offset;
1992 em->len = (copy_size + root->sectorsize - 1) &
1993 ~((u64)root->sectorsize - 1);
1995 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
1996 if (create == 0 && !PageUptodate(page)) {
1997 read_extent_buffer(leaf, map + pg_offset, ptr,
1999 flush_dcache_page(page);
2000 } else if (create && PageUptodate(page)) {
2003 free_extent_map(em);
2005 btrfs_release_path(root, path);
2006 trans = btrfs_start_transaction(root, 1);
2009 write_extent_buffer(leaf, map + pg_offset, ptr,
2011 btrfs_mark_buffer_dirty(leaf);
2014 set_extent_uptodate(io_tree, em->start,
2015 extent_map_end(em) - 1, GFP_NOFS);
2018 printk("unkknown found_type %d\n", found_type);
2025 em->block_start = EXTENT_MAP_HOLE;
2027 btrfs_release_path(root, path);
2028 if (em->start > start || extent_map_end(em) <= start) {
2029 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len);
2035 spin_lock(&em_tree->lock);
2036 ret = add_extent_mapping(em_tree, em);
2037 if (ret == -EEXIST) {
2038 free_extent_map(em);
2039 em = lookup_extent_mapping(em_tree, start, len);
2042 printk("failing to insert %Lu %Lu\n", start, len);
2045 spin_unlock(&em_tree->lock);
2047 btrfs_free_path(path);
2049 ret = btrfs_end_transaction(trans, root);
2053 mutex_unlock(&root->fs_info->fs_mutex);
2055 free_extent_map(em);
2057 return ERR_PTR(err);
2062 static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
2064 return extent_bmap(mapping, iblock, btrfs_get_extent);
2067 int btrfs_readpage(struct file *file, struct page *page)
2069 struct extent_io_tree *tree;
2070 tree = &BTRFS_I(page->mapping->host)->io_tree;
2071 return extent_read_full_page(tree, page, btrfs_get_extent);
2074 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
2076 struct extent_io_tree *tree;
2079 if (current->flags & PF_MEMALLOC) {
2080 redirty_page_for_writepage(wbc, page);
2084 tree = &BTRFS_I(page->mapping->host)->io_tree;
2085 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
2088 static int btrfs_writepages(struct address_space *mapping,
2089 struct writeback_control *wbc)
2091 struct extent_io_tree *tree;
2092 tree = &BTRFS_I(mapping->host)->io_tree;
2093 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2097 btrfs_readpages(struct file *file, struct address_space *mapping,
2098 struct list_head *pages, unsigned nr_pages)
2100 struct extent_io_tree *tree;
2101 tree = &BTRFS_I(mapping->host)->io_tree;
2102 return extent_readpages(tree, mapping, pages, nr_pages,
2106 static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
2108 struct extent_io_tree *tree;
2109 struct extent_map_tree *map;
2112 tree = &BTRFS_I(page->mapping->host)->io_tree;
2113 map = &BTRFS_I(page->mapping->host)->extent_tree;
2114 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
2116 ClearPagePrivate(page);
2117 set_page_private(page, 0);
2118 page_cache_release(page);
2123 static void btrfs_invalidatepage(struct page *page, unsigned long offset)
2125 struct extent_io_tree *tree;
2127 tree = &BTRFS_I(page->mapping->host)->io_tree;
2128 extent_invalidatepage(tree, page, offset);
2129 btrfs_releasepage(page, GFP_NOFS);
2133 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2134 * called from a page fault handler when a page is first dirtied. Hence we must
2135 * be careful to check for EOF conditions here. We set the page up correctly
2136 * for a written page which means we get ENOSPC checking when writing into
2137 * holes and correct delalloc and unwritten extent mapping on filesystems that
2138 * support these features.
2140 * We are not allowed to take the i_mutex here so we have to play games to
2141 * protect against truncate races as the page could now be beyond EOF. Because
2142 * vmtruncate() writes the inode size before removing pages, once we have the
2143 * page lock we can determine safely if the page is beyond EOF. If it is not
2144 * beyond EOF, then the page is guaranteed safe against truncation until we
2147 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2149 struct inode *inode = fdentry(vma->vm_file)->d_inode;
2150 struct btrfs_root *root = BTRFS_I(inode)->root;
2156 mutex_lock(&root->fs_info->fs_mutex);
2157 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
2158 mutex_unlock(&root->fs_info->fs_mutex);
2165 wait_on_page_writeback(page);
2166 size = i_size_read(inode);
2167 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2169 if ((page->mapping != inode->i_mapping) ||
2170 (page_start > size)) {
2171 /* page got truncated out from underneath us */
2175 /* page is wholly or partially inside EOF */
2176 if (page_start + PAGE_CACHE_SIZE > size)
2177 end = size & ~PAGE_CACHE_MASK;
2179 end = PAGE_CACHE_SIZE;
2181 ret = btrfs_cow_one_page(inode, page, end);
2189 static void btrfs_truncate(struct inode *inode)
2191 struct btrfs_root *root = BTRFS_I(inode)->root;
2193 struct btrfs_trans_handle *trans;
2196 if (!S_ISREG(inode->i_mode))
2198 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2201 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2203 mutex_lock(&root->fs_info->fs_mutex);
2204 trans = btrfs_start_transaction(root, 1);
2205 btrfs_set_trans_block_group(trans, inode);
2207 /* FIXME, add redo link to tree so we don't leak on crash */
2208 ret = btrfs_truncate_in_trans(trans, root, inode,
2209 BTRFS_EXTENT_DATA_KEY);
2210 btrfs_update_inode(trans, root, inode);
2211 nr = trans->blocks_used;
2213 ret = btrfs_end_transaction(trans, root);
2215 mutex_unlock(&root->fs_info->fs_mutex);
2216 btrfs_btree_balance_dirty(root, nr);
2217 btrfs_throttle(root);
2220 static int noinline create_subvol(struct btrfs_root *root, char *name,
2223 struct btrfs_trans_handle *trans;
2224 struct btrfs_key key;
2225 struct btrfs_root_item root_item;
2226 struct btrfs_inode_item *inode_item;
2227 struct extent_buffer *leaf;
2228 struct btrfs_root *new_root = root;
2229 struct inode *inode;
2234 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
2235 unsigned long nr = 1;
2237 mutex_lock(&root->fs_info->fs_mutex);
2238 ret = btrfs_check_free_space(root, 1, 0);
2242 trans = btrfs_start_transaction(root, 1);
2245 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2250 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2251 objectid, trans->transid, 0, 0,
2254 return PTR_ERR(leaf);
2256 btrfs_set_header_nritems(leaf, 0);
2257 btrfs_set_header_level(leaf, 0);
2258 btrfs_set_header_bytenr(leaf, leaf->start);
2259 btrfs_set_header_generation(leaf, trans->transid);
2260 btrfs_set_header_owner(leaf, objectid);
2262 write_extent_buffer(leaf, root->fs_info->fsid,
2263 (unsigned long)btrfs_header_fsid(leaf),
2265 btrfs_mark_buffer_dirty(leaf);
2267 inode_item = &root_item.inode;
2268 memset(inode_item, 0, sizeof(*inode_item));
2269 inode_item->generation = cpu_to_le64(1);
2270 inode_item->size = cpu_to_le64(3);
2271 inode_item->nlink = cpu_to_le32(1);
2272 inode_item->nblocks = cpu_to_le64(1);
2273 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
2275 btrfs_set_root_bytenr(&root_item, leaf->start);
2276 btrfs_set_root_level(&root_item, 0);
2277 btrfs_set_root_refs(&root_item, 1);
2278 btrfs_set_root_used(&root_item, 0);
2280 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2281 root_item.drop_level = 0;
2283 free_extent_buffer(leaf);
2286 btrfs_set_root_dirid(&root_item, new_dirid);
2288 key.objectid = objectid;
2290 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2291 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2297 * insert the directory item
2299 key.offset = (u64)-1;
2300 dir = root->fs_info->sb->s_root->d_inode;
2301 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2302 name, namelen, dir->i_ino, &key,
2307 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2308 name, namelen, objectid,
2309 root->fs_info->sb->s_root->d_inode->i_ino);
2313 ret = btrfs_commit_transaction(trans, root);
2317 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
2320 trans = btrfs_start_transaction(new_root, 1);
2323 inode = btrfs_new_inode(trans, new_root, new_dirid,
2324 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
2327 inode->i_op = &btrfs_dir_inode_operations;
2328 inode->i_fop = &btrfs_dir_file_operations;
2329 new_root->inode = inode;
2331 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2335 ret = btrfs_update_inode(trans, new_root, inode);
2339 nr = trans->blocks_used;
2340 err = btrfs_commit_transaction(trans, new_root);
2344 mutex_unlock(&root->fs_info->fs_mutex);
2345 btrfs_btree_balance_dirty(root, nr);
2346 btrfs_throttle(root);
2350 static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2352 struct btrfs_pending_snapshot *pending_snapshot;
2353 struct btrfs_trans_handle *trans;
2356 unsigned long nr = 0;
2358 if (!root->ref_cows)
2361 mutex_lock(&root->fs_info->fs_mutex);
2362 ret = btrfs_check_free_space(root, 1, 0);
2366 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
2367 if (!pending_snapshot) {
2371 pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
2372 if (!pending_snapshot->name) {
2374 kfree(pending_snapshot);
2377 memcpy(pending_snapshot->name, name, namelen);
2378 pending_snapshot->name[namelen] = '\0';
2379 trans = btrfs_start_transaction(root, 1);
2381 pending_snapshot->root = root;
2382 list_add(&pending_snapshot->list,
2383 &trans->transaction->pending_snapshots);
2384 ret = btrfs_update_inode(trans, root, root->inode);
2385 err = btrfs_commit_transaction(trans, root);
2388 mutex_unlock(&root->fs_info->fs_mutex);
2389 btrfs_btree_balance_dirty(root, nr);
2390 btrfs_throttle(root);
2394 unsigned long btrfs_force_ra(struct address_space *mapping,
2395 struct file_ra_state *ra, struct file *file,
2396 pgoff_t offset, pgoff_t last_index)
2400 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2401 req_size = last_index - offset + 1;
2402 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2405 req_size = min(last_index - offset + 1, (pgoff_t)128);
2406 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2407 return offset + req_size;
2411 int btrfs_defrag_file(struct file *file) {
2412 struct inode *inode = fdentry(file)->d_inode;
2413 struct btrfs_root *root = BTRFS_I(inode)->root;
2414 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2416 unsigned long last_index;
2417 unsigned long ra_index = 0;
2421 u64 existing_delalloc;
2425 mutex_lock(&root->fs_info->fs_mutex);
2426 ret = btrfs_check_free_space(root, inode->i_size, 0);
2427 mutex_unlock(&root->fs_info->fs_mutex);
2431 mutex_lock(&inode->i_mutex);
2432 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2433 for (i = 0; i <= last_index; i++) {
2434 if (i == ra_index) {
2435 ra_index = btrfs_force_ra(inode->i_mapping,
2437 file, ra_index, last_index);
2439 page = grab_cache_page(inode->i_mapping, i);
2442 if (!PageUptodate(page)) {
2443 btrfs_readpage(NULL, page);
2445 if (!PageUptodate(page)) {
2447 page_cache_release(page);
2451 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2452 page_end = page_start + PAGE_CACHE_SIZE - 1;
2454 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
2455 delalloc_start = page_start;
2457 count_range_bits(&BTRFS_I(inode)->io_tree,
2458 &delalloc_start, page_end,
2459 PAGE_CACHE_SIZE, EXTENT_DELALLOC);
2460 set_extent_delalloc(io_tree, page_start,
2461 page_end, GFP_NOFS);
2463 spin_lock(&root->fs_info->delalloc_lock);
2464 root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE -
2466 spin_unlock(&root->fs_info->delalloc_lock);
2468 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
2469 set_page_dirty(page);
2471 page_cache_release(page);
2472 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2476 mutex_unlock(&inode->i_mutex);
2480 static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2484 struct btrfs_ioctl_vol_args *vol_args;
2485 struct btrfs_trans_handle *trans;
2491 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2496 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2500 namelen = strlen(vol_args->name);
2501 if (namelen > BTRFS_VOL_NAME_MAX) {
2506 sizestr = vol_args->name;
2507 if (!strcmp(sizestr, "max"))
2508 new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
2510 if (sizestr[0] == '-') {
2513 } else if (sizestr[0] == '+') {
2517 new_size = btrfs_parse_size(sizestr);
2518 if (new_size == 0) {
2524 mutex_lock(&root->fs_info->fs_mutex);
2525 old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);
2528 if (new_size > old_size) {
2532 new_size = old_size - new_size;
2533 } else if (mod > 0) {
2534 new_size = old_size + new_size;
2537 if (new_size < 256 * 1024 * 1024) {
2541 if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
2546 do_div(new_size, root->sectorsize);
2547 new_size *= root->sectorsize;
2549 printk("new size is %Lu\n", new_size);
2550 if (new_size > old_size) {
2551 trans = btrfs_start_transaction(root, 1);
2552 ret = btrfs_grow_extent_tree(trans, root, new_size);
2553 btrfs_commit_transaction(trans, root);
2555 ret = btrfs_shrink_extent_tree(root, new_size);
2559 mutex_unlock(&root->fs_info->fs_mutex);
2565 static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
2568 struct btrfs_ioctl_vol_args *vol_args;
2569 struct btrfs_dir_item *di;
2570 struct btrfs_path *path;
2575 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2580 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2585 namelen = strlen(vol_args->name);
2586 if (namelen > BTRFS_VOL_NAME_MAX) {
2590 if (strchr(vol_args->name, '/')) {
2595 path = btrfs_alloc_path();
2601 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2602 mutex_lock(&root->fs_info->fs_mutex);
2603 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2605 vol_args->name, namelen, 0);
2606 mutex_unlock(&root->fs_info->fs_mutex);
2607 btrfs_free_path(path);
2609 if (di && !IS_ERR(di)) {
2619 if (root == root->fs_info->tree_root)
2620 ret = create_subvol(root, vol_args->name, namelen);
2622 ret = create_snapshot(root, vol_args->name, namelen);
2628 static int btrfs_ioctl_defrag(struct file *file)
2630 struct inode *inode = fdentry(file)->d_inode;
2631 struct btrfs_root *root = BTRFS_I(inode)->root;
2633 switch (inode->i_mode & S_IFMT) {
2635 mutex_lock(&root->fs_info->fs_mutex);
2636 btrfs_defrag_root(root, 0);
2637 btrfs_defrag_root(root->fs_info->extent_root, 0);
2638 mutex_unlock(&root->fs_info->fs_mutex);
2641 btrfs_defrag_file(file);
2648 long btrfs_ioctl(struct file *file, unsigned int
2649 cmd, unsigned long arg)
2651 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
2654 case BTRFS_IOC_SNAP_CREATE:
2655 return btrfs_ioctl_snap_create(root, (void __user *)arg);
2656 case BTRFS_IOC_DEFRAG:
2657 return btrfs_ioctl_defrag(file);
2658 case BTRFS_IOC_RESIZE:
2659 return btrfs_ioctl_resize(root, (void __user *)arg);
2666 * Called inside transaction, so use GFP_NOFS
2668 struct inode *btrfs_alloc_inode(struct super_block *sb)
2670 struct btrfs_inode *ei;
2672 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2676 ei->ordered_trans = 0;
2677 return &ei->vfs_inode;
2680 void btrfs_destroy_inode(struct inode *inode)
2682 WARN_ON(!list_empty(&inode->i_dentry));
2683 WARN_ON(inode->i_data.nrpages);
2685 btrfs_drop_extent_cache(inode, 0, (u64)-1);
2686 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2689 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2690 static void init_once(struct kmem_cache * cachep, void *foo)
2692 static void init_once(void * foo, struct kmem_cache * cachep,
2693 unsigned long flags)
2696 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2698 inode_init_once(&ei->vfs_inode);
2701 void btrfs_destroy_cachep(void)
2703 if (btrfs_inode_cachep)
2704 kmem_cache_destroy(btrfs_inode_cachep);
2705 if (btrfs_trans_handle_cachep)
2706 kmem_cache_destroy(btrfs_trans_handle_cachep);
2707 if (btrfs_transaction_cachep)
2708 kmem_cache_destroy(btrfs_transaction_cachep);
2709 if (btrfs_bit_radix_cachep)
2710 kmem_cache_destroy(btrfs_bit_radix_cachep);
2711 if (btrfs_path_cachep)
2712 kmem_cache_destroy(btrfs_path_cachep);
2715 struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
2716 unsigned long extra_flags,
2717 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2718 void (*ctor)(struct kmem_cache *, void *)
2720 void (*ctor)(void *, struct kmem_cache *,
2725 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2726 SLAB_MEM_SPREAD | extra_flags), ctor
2727 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2733 int btrfs_init_cachep(void)
2735 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
2736 sizeof(struct btrfs_inode),
2738 if (!btrfs_inode_cachep)
2740 btrfs_trans_handle_cachep =
2741 btrfs_cache_create("btrfs_trans_handle_cache",
2742 sizeof(struct btrfs_trans_handle),
2744 if (!btrfs_trans_handle_cachep)
2746 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
2747 sizeof(struct btrfs_transaction),
2749 if (!btrfs_transaction_cachep)
2751 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
2752 sizeof(struct btrfs_path),
2754 if (!btrfs_path_cachep)
2756 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
2757 SLAB_DESTROY_BY_RCU, NULL);
2758 if (!btrfs_bit_radix_cachep)
2762 btrfs_destroy_cachep();
2766 static int btrfs_getattr(struct vfsmount *mnt,
2767 struct dentry *dentry, struct kstat *stat)
2769 struct inode *inode = dentry->d_inode;
2770 generic_fillattr(inode, stat);
2771 stat->blksize = PAGE_CACHE_SIZE;
2775 static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
2776 struct inode * new_dir,struct dentry *new_dentry)
2778 struct btrfs_trans_handle *trans;
2779 struct btrfs_root *root = BTRFS_I(old_dir)->root;
2780 struct inode *new_inode = new_dentry->d_inode;
2781 struct inode *old_inode = old_dentry->d_inode;
2782 struct timespec ctime = CURRENT_TIME;
2783 struct btrfs_path *path;
2786 if (S_ISDIR(old_inode->i_mode) && new_inode &&
2787 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
2791 mutex_lock(&root->fs_info->fs_mutex);
2792 ret = btrfs_check_free_space(root, 1, 0);
2796 trans = btrfs_start_transaction(root, 1);
2798 btrfs_set_trans_block_group(trans, new_dir);
2799 path = btrfs_alloc_path();
2805 old_dentry->d_inode->i_nlink++;
2806 old_dir->i_ctime = old_dir->i_mtime = ctime;
2807 new_dir->i_ctime = new_dir->i_mtime = ctime;
2808 old_inode->i_ctime = ctime;
2810 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
2815 new_inode->i_ctime = CURRENT_TIME;
2816 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
2820 ret = btrfs_add_link(trans, new_dentry, old_inode);
2825 btrfs_free_path(path);
2826 btrfs_end_transaction(trans, root);
2828 mutex_unlock(&root->fs_info->fs_mutex);
2832 static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
2833 const char *symname)
2835 struct btrfs_trans_handle *trans;
2836 struct btrfs_root *root = BTRFS_I(dir)->root;
2837 struct btrfs_path *path;
2838 struct btrfs_key key;
2839 struct inode *inode = NULL;
2846 struct btrfs_file_extent_item *ei;
2847 struct extent_buffer *leaf;
2848 unsigned long nr = 0;
2850 name_len = strlen(symname) + 1;
2851 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
2852 return -ENAMETOOLONG;
2854 mutex_lock(&root->fs_info->fs_mutex);
2855 err = btrfs_check_free_space(root, 1, 0);
2859 trans = btrfs_start_transaction(root, 1);
2860 btrfs_set_trans_block_group(trans, dir);
2862 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2868 inode = btrfs_new_inode(trans, root, objectid,
2869 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
2870 err = PTR_ERR(inode);
2874 btrfs_set_trans_block_group(trans, inode);
2875 err = btrfs_add_nondir(trans, dentry, inode);
2879 inode->i_mapping->a_ops = &btrfs_aops;
2880 inode->i_fop = &btrfs_file_operations;
2881 inode->i_op = &btrfs_file_inode_operations;
2882 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
2883 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
2884 inode->i_mapping, GFP_NOFS);
2885 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
2887 dir->i_sb->s_dirt = 1;
2888 btrfs_update_inode_block_group(trans, inode);
2889 btrfs_update_inode_block_group(trans, dir);
2893 path = btrfs_alloc_path();
2895 key.objectid = inode->i_ino;
2897 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2898 datasize = btrfs_file_extent_calc_inline_size(name_len);
2899 err = btrfs_insert_empty_item(trans, root, path, &key,
2905 leaf = path->nodes[0];
2906 ei = btrfs_item_ptr(leaf, path->slots[0],
2907 struct btrfs_file_extent_item);
2908 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
2909 btrfs_set_file_extent_type(leaf, ei,
2910 BTRFS_FILE_EXTENT_INLINE);
2911 ptr = btrfs_file_extent_inline_start(ei);
2912 write_extent_buffer(leaf, symname, ptr, name_len);
2913 btrfs_mark_buffer_dirty(leaf);
2914 btrfs_free_path(path);
2916 inode->i_op = &btrfs_symlink_inode_operations;
2917 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2918 inode->i_size = name_len - 1;
2919 err = btrfs_update_inode(trans, root, inode);
2924 nr = trans->blocks_used;
2925 btrfs_end_transaction(trans, root);
2927 mutex_unlock(&root->fs_info->fs_mutex);
2929 inode_dec_link_count(inode);
2932 btrfs_btree_balance_dirty(root, nr);
2933 btrfs_throttle(root);
2936 static int btrfs_permission(struct inode *inode, int mask,
2937 struct nameidata *nd)
2939 if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
2941 return generic_permission(inode, mask, NULL);
2944 static struct inode_operations btrfs_dir_inode_operations = {
2945 .lookup = btrfs_lookup,
2946 .create = btrfs_create,
2947 .unlink = btrfs_unlink,
2949 .mkdir = btrfs_mkdir,
2950 .rmdir = btrfs_rmdir,
2951 .rename = btrfs_rename,
2952 .symlink = btrfs_symlink,
2953 .setattr = btrfs_setattr,
2954 .mknod = btrfs_mknod,
2955 .setxattr = generic_setxattr,
2956 .getxattr = generic_getxattr,
2957 .listxattr = btrfs_listxattr,
2958 .removexattr = generic_removexattr,
2959 .permission = btrfs_permission,
2961 static struct inode_operations btrfs_dir_ro_inode_operations = {
2962 .lookup = btrfs_lookup,
2963 .permission = btrfs_permission,
2965 static struct file_operations btrfs_dir_file_operations = {
2966 .llseek = generic_file_llseek,
2967 .read = generic_read_dir,
2968 .readdir = btrfs_readdir,
2969 .unlocked_ioctl = btrfs_ioctl,
2970 #ifdef CONFIG_COMPAT
2971 .compat_ioctl = btrfs_ioctl,
2975 static struct extent_io_ops btrfs_extent_io_ops = {
2976 .fill_delalloc = run_delalloc_range,
2977 .writepage_io_hook = btrfs_writepage_io_hook,
2978 .readpage_io_hook = btrfs_readpage_io_hook,
2979 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
2982 static struct address_space_operations btrfs_aops = {
2983 .readpage = btrfs_readpage,
2984 .writepage = btrfs_writepage,
2985 .writepages = btrfs_writepages,
2986 .readpages = btrfs_readpages,
2987 .sync_page = block_sync_page,
2989 .invalidatepage = btrfs_invalidatepage,
2990 .releasepage = btrfs_releasepage,
2991 .set_page_dirty = __set_page_dirty_nobuffers,
2994 static struct address_space_operations btrfs_symlink_aops = {
2995 .readpage = btrfs_readpage,
2996 .writepage = btrfs_writepage,
2997 .invalidatepage = btrfs_invalidatepage,
2998 .releasepage = btrfs_releasepage,
3001 static struct inode_operations btrfs_file_inode_operations = {
3002 .truncate = btrfs_truncate,
3003 .getattr = btrfs_getattr,
3004 .setattr = btrfs_setattr,
3005 .setxattr = generic_setxattr,
3006 .getxattr = generic_getxattr,
3007 .listxattr = btrfs_listxattr,
3008 .removexattr = generic_removexattr,
3009 .permission = btrfs_permission,
3011 static struct inode_operations btrfs_special_inode_operations = {
3012 .getattr = btrfs_getattr,
3013 .setattr = btrfs_setattr,
3014 .permission = btrfs_permission,
3016 static struct inode_operations btrfs_symlink_inode_operations = {
3017 .readlink = generic_readlink,
3018 .follow_link = page_follow_link_light,
3019 .put_link = page_put_link,
3020 .permission = btrfs_permission,