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 if (!BTRFS_I(inode)->block_group) {
406 BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
409 btrfs_free_path(path);
412 mutex_unlock(&root->fs_info->fs_mutex);
414 switch (inode->i_mode & S_IFMT) {
416 inode->i_mapping->a_ops = &btrfs_aops;
417 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
418 inode->i_fop = &btrfs_file_operations;
419 inode->i_op = &btrfs_file_inode_operations;
422 inode->i_fop = &btrfs_dir_file_operations;
423 if (root == root->fs_info->tree_root)
424 inode->i_op = &btrfs_dir_ro_inode_operations;
426 inode->i_op = &btrfs_dir_inode_operations;
429 inode->i_op = &btrfs_symlink_inode_operations;
430 inode->i_mapping->a_ops = &btrfs_symlink_aops;
433 init_special_inode(inode, inode->i_mode, rdev);
439 btrfs_release_path(root, path);
440 btrfs_free_path(path);
441 mutex_unlock(&root->fs_info->fs_mutex);
442 make_bad_inode(inode);
445 static void fill_inode_item(struct extent_buffer *leaf,
446 struct btrfs_inode_item *item,
449 btrfs_set_inode_uid(leaf, item, inode->i_uid);
450 btrfs_set_inode_gid(leaf, item, inode->i_gid);
451 btrfs_set_inode_size(leaf, item, inode->i_size);
452 btrfs_set_inode_mode(leaf, item, inode->i_mode);
453 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
455 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
456 inode->i_atime.tv_sec);
457 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
458 inode->i_atime.tv_nsec);
460 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
461 inode->i_mtime.tv_sec);
462 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
463 inode->i_mtime.tv_nsec);
465 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
466 inode->i_ctime.tv_sec);
467 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
468 inode->i_ctime.tv_nsec);
470 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
471 btrfs_set_inode_generation(leaf, item, inode->i_generation);
472 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
473 btrfs_set_inode_block_group(leaf, item,
474 BTRFS_I(inode)->block_group->key.objectid);
477 int btrfs_update_inode(struct btrfs_trans_handle *trans,
478 struct btrfs_root *root,
481 struct btrfs_inode_item *inode_item;
482 struct btrfs_path *path;
483 struct extent_buffer *leaf;
486 path = btrfs_alloc_path();
488 ret = btrfs_lookup_inode(trans, root, path,
489 &BTRFS_I(inode)->location, 1);
496 leaf = path->nodes[0];
497 inode_item = btrfs_item_ptr(leaf, path->slots[0],
498 struct btrfs_inode_item);
500 fill_inode_item(leaf, inode_item, inode);
501 btrfs_mark_buffer_dirty(leaf);
502 btrfs_set_inode_last_trans(trans, inode);
505 btrfs_release_path(root, path);
506 btrfs_free_path(path);
511 static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
512 struct btrfs_root *root,
514 struct dentry *dentry)
516 struct btrfs_path *path;
517 const char *name = dentry->d_name.name;
518 int name_len = dentry->d_name.len;
520 struct extent_buffer *leaf;
521 struct btrfs_dir_item *di;
522 struct btrfs_key key;
524 path = btrfs_alloc_path();
530 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
540 leaf = path->nodes[0];
541 btrfs_dir_item_key_to_cpu(leaf, di, &key);
542 ret = btrfs_delete_one_dir_name(trans, root, path, di);
545 btrfs_release_path(root, path);
547 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
548 key.objectid, name, name_len, -1);
557 ret = btrfs_delete_one_dir_name(trans, root, path, di);
559 dentry->d_inode->i_ctime = dir->i_ctime;
560 ret = btrfs_del_inode_ref(trans, root, name, name_len,
561 dentry->d_inode->i_ino,
562 dentry->d_parent->d_inode->i_ino);
564 printk("failed to delete reference to %.*s, "
565 "inode %lu parent %lu\n", name_len, name,
566 dentry->d_inode->i_ino,
567 dentry->d_parent->d_inode->i_ino);
570 btrfs_free_path(path);
572 dir->i_size -= name_len * 2;
573 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
574 btrfs_update_inode(trans, root, dir);
575 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
576 dentry->d_inode->i_nlink--;
578 drop_nlink(dentry->d_inode);
580 ret = btrfs_update_inode(trans, root, dentry->d_inode);
581 dir->i_sb->s_dirt = 1;
586 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
588 struct btrfs_root *root;
589 struct btrfs_trans_handle *trans;
591 unsigned long nr = 0;
593 root = BTRFS_I(dir)->root;
594 mutex_lock(&root->fs_info->fs_mutex);
596 ret = btrfs_check_free_space(root, 1, 1);
600 trans = btrfs_start_transaction(root, 1);
602 btrfs_set_trans_block_group(trans, dir);
603 ret = btrfs_unlink_trans(trans, root, dir, dentry);
604 nr = trans->blocks_used;
606 btrfs_end_transaction(trans, root);
608 mutex_unlock(&root->fs_info->fs_mutex);
609 btrfs_btree_balance_dirty(root, nr);
613 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
615 struct inode *inode = dentry->d_inode;
618 struct btrfs_root *root = BTRFS_I(dir)->root;
619 struct btrfs_trans_handle *trans;
620 unsigned long nr = 0;
622 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
625 mutex_lock(&root->fs_info->fs_mutex);
626 ret = btrfs_check_free_space(root, 1, 1);
630 trans = btrfs_start_transaction(root, 1);
631 btrfs_set_trans_block_group(trans, dir);
633 /* now the directory is empty */
634 err = btrfs_unlink_trans(trans, root, dir, dentry);
639 nr = trans->blocks_used;
640 ret = btrfs_end_transaction(trans, root);
642 mutex_unlock(&root->fs_info->fs_mutex);
643 btrfs_btree_balance_dirty(root, nr);
650 static int btrfs_free_inode(struct btrfs_trans_handle *trans,
651 struct btrfs_root *root,
654 struct btrfs_path *path;
659 path = btrfs_alloc_path();
661 ret = btrfs_lookup_inode(trans, root, path,
662 &BTRFS_I(inode)->location, -1);
666 ret = btrfs_del_item(trans, root, path);
667 btrfs_free_path(path);
672 * this can truncate away extent items, csum items and directory items.
673 * It starts at a high offset and removes keys until it can't find
674 * any higher than i_size.
676 * csum items that cross the new i_size are truncated to the new size
679 static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
680 struct btrfs_root *root,
684 struct btrfs_path *path;
685 struct btrfs_key key;
686 struct btrfs_key found_key;
688 struct extent_buffer *leaf;
689 struct btrfs_file_extent_item *fi;
690 u64 extent_start = 0;
691 u64 extent_num_bytes = 0;
697 int extent_type = -1;
699 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
700 path = btrfs_alloc_path();
704 /* FIXME, add redo link to tree so we don't leak on crash */
705 key.objectid = inode->i_ino;
706 key.offset = (u64)-1;
710 btrfs_init_path(path);
712 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
717 BUG_ON(path->slots[0] == 0);
720 leaf = path->nodes[0];
721 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
722 found_type = btrfs_key_type(&found_key);
724 if (found_key.objectid != inode->i_ino)
727 if (found_type != BTRFS_CSUM_ITEM_KEY &&
728 found_type != BTRFS_DIR_ITEM_KEY &&
729 found_type != BTRFS_DIR_INDEX_KEY &&
730 found_type != BTRFS_EXTENT_DATA_KEY)
733 item_end = found_key.offset;
734 if (found_type == BTRFS_EXTENT_DATA_KEY) {
735 fi = btrfs_item_ptr(leaf, path->slots[0],
736 struct btrfs_file_extent_item);
737 extent_type = btrfs_file_extent_type(leaf, fi);
738 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
740 btrfs_file_extent_num_bytes(leaf, fi);
741 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
742 struct btrfs_item *item = btrfs_item_nr(leaf,
744 item_end += btrfs_file_extent_inline_len(leaf,
749 if (found_type == BTRFS_CSUM_ITEM_KEY) {
750 ret = btrfs_csum_truncate(trans, root, path,
754 if (item_end < inode->i_size) {
755 if (found_type == BTRFS_DIR_ITEM_KEY) {
756 found_type = BTRFS_INODE_ITEM_KEY;
757 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
758 found_type = BTRFS_CSUM_ITEM_KEY;
759 } else if (found_type) {
764 btrfs_set_key_type(&key, found_type);
765 btrfs_release_path(root, path);
768 if (found_key.offset >= inode->i_size)
774 /* FIXME, shrink the extent if the ref count is only 1 */
775 if (found_type != BTRFS_EXTENT_DATA_KEY)
778 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
780 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
783 btrfs_file_extent_num_bytes(leaf, fi);
784 extent_num_bytes = inode->i_size -
785 found_key.offset + root->sectorsize - 1;
786 btrfs_set_file_extent_num_bytes(leaf, fi,
788 num_dec = (orig_num_bytes -
789 extent_num_bytes) >> 9;
790 if (extent_start != 0) {
791 inode->i_blocks -= num_dec;
793 btrfs_mark_buffer_dirty(leaf);
796 btrfs_file_extent_disk_num_bytes(leaf,
798 /* FIXME blocksize != 4096 */
799 num_dec = btrfs_file_extent_num_bytes(leaf,
801 if (extent_start != 0) {
803 inode->i_blocks -= num_dec;
805 root_gen = btrfs_header_generation(leaf);
806 root_owner = btrfs_header_owner(leaf);
808 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE &&
810 u32 newsize = inode->i_size - found_key.offset;
811 newsize = btrfs_file_extent_calc_inline_size(newsize);
812 ret = btrfs_truncate_item(trans, root, path,
818 ret = btrfs_del_item(trans, root, path);
824 btrfs_release_path(root, path);
826 ret = btrfs_free_extent(trans, root, extent_start,
829 root_gen, inode->i_ino,
830 found_key.offset, 0);
836 btrfs_release_path(root, path);
837 btrfs_free_path(path);
838 inode->i_sb->s_dirt = 1;
842 static int btrfs_cow_one_page(struct inode *inode, struct page *page,
846 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
847 struct btrfs_root *root = BTRFS_I(inode)->root;
848 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
849 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
850 u64 existing_delalloc;
854 WARN_ON(!PageLocked(page));
855 set_page_extent_mapped(page);
857 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
858 delalloc_start = page_start;
859 existing_delalloc = count_range_bits(&BTRFS_I(inode)->extent_tree,
860 &delalloc_start, page_end,
861 PAGE_CACHE_SIZE, EXTENT_DELALLOC);
862 set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start,
865 spin_lock(&root->fs_info->delalloc_lock);
866 root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE - existing_delalloc;
867 spin_unlock(&root->fs_info->delalloc_lock);
869 if (zero_start != PAGE_CACHE_SIZE) {
871 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
872 flush_dcache_page(page);
875 set_page_dirty(page);
876 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
882 * taken from block_truncate_page, but does cow as it zeros out
883 * any bytes left in the last page in the file.
885 static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
887 struct inode *inode = mapping->host;
888 struct btrfs_root *root = BTRFS_I(inode)->root;
889 u32 blocksize = root->sectorsize;
890 pgoff_t index = from >> PAGE_CACHE_SHIFT;
891 unsigned offset = from & (PAGE_CACHE_SIZE-1);
896 if ((offset & (blocksize - 1)) == 0)
899 down_read(&root->snap_sem);
901 page = grab_cache_page(mapping, index);
904 if (!PageUptodate(page)) {
905 ret = btrfs_readpage(NULL, page);
907 if (!PageUptodate(page)) {
912 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
914 ret = btrfs_cow_one_page(inode, page, offset);
917 page_cache_release(page);
918 up_read(&BTRFS_I(inode)->root->snap_sem);
923 static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
925 struct inode *inode = dentry->d_inode;
928 err = inode_change_ok(inode, attr);
932 if (S_ISREG(inode->i_mode) &&
933 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
934 struct btrfs_trans_handle *trans;
935 struct btrfs_root *root = BTRFS_I(inode)->root;
936 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
938 u64 mask = root->sectorsize - 1;
939 u64 pos = (inode->i_size + mask) & ~mask;
940 u64 block_end = attr->ia_size | mask;
944 if (attr->ia_size <= pos)
947 mutex_lock(&root->fs_info->fs_mutex);
948 err = btrfs_check_free_space(root, 1, 0);
949 mutex_unlock(&root->fs_info->fs_mutex);
953 btrfs_truncate_page(inode->i_mapping, inode->i_size);
955 lock_extent(em_tree, pos, block_end, GFP_NOFS);
956 hole_size = (attr->ia_size - pos + mask) & ~mask;
958 mutex_lock(&root->fs_info->fs_mutex);
959 trans = btrfs_start_transaction(root, 1);
960 btrfs_set_trans_block_group(trans, inode);
961 err = btrfs_drop_extents(trans, root, inode,
962 pos, pos + hole_size, pos,
965 if (alloc_hint != EXTENT_MAP_INLINE) {
966 err = btrfs_insert_file_extent(trans, root,
968 pos, 0, 0, hole_size);
970 btrfs_end_transaction(trans, root);
971 mutex_unlock(&root->fs_info->fs_mutex);
972 unlock_extent(em_tree, pos, block_end, GFP_NOFS);
977 err = inode_setattr(inode, attr);
981 void btrfs_delete_inode(struct inode *inode)
983 struct btrfs_trans_handle *trans;
984 struct btrfs_root *root = BTRFS_I(inode)->root;
988 truncate_inode_pages(&inode->i_data, 0);
989 if (is_bad_inode(inode)) {
994 mutex_lock(&root->fs_info->fs_mutex);
995 trans = btrfs_start_transaction(root, 1);
997 btrfs_set_trans_block_group(trans, inode);
998 ret = btrfs_truncate_in_trans(trans, root, inode);
1000 goto no_delete_lock;
1001 ret = btrfs_delete_xattrs(trans, root, inode);
1003 goto no_delete_lock;
1004 ret = btrfs_free_inode(trans, root, inode);
1006 goto no_delete_lock;
1007 nr = trans->blocks_used;
1009 btrfs_end_transaction(trans, root);
1010 mutex_unlock(&root->fs_info->fs_mutex);
1011 btrfs_btree_balance_dirty(root, nr);
1015 nr = trans->blocks_used;
1016 btrfs_end_transaction(trans, root);
1017 mutex_unlock(&root->fs_info->fs_mutex);
1018 btrfs_btree_balance_dirty(root, nr);
1024 * this returns the key found in the dir entry in the location pointer.
1025 * If no dir entries were found, location->objectid is 0.
1027 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1028 struct btrfs_key *location)
1030 const char *name = dentry->d_name.name;
1031 int namelen = dentry->d_name.len;
1032 struct btrfs_dir_item *di;
1033 struct btrfs_path *path;
1034 struct btrfs_root *root = BTRFS_I(dir)->root;
1037 if (namelen == 1 && strcmp(name, ".") == 0) {
1038 location->objectid = dir->i_ino;
1039 location->type = BTRFS_INODE_ITEM_KEY;
1040 location->offset = 0;
1043 path = btrfs_alloc_path();
1046 if (namelen == 2 && strcmp(name, "..") == 0) {
1047 struct btrfs_key key;
1048 struct extent_buffer *leaf;
1052 key.objectid = dir->i_ino;
1053 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1055 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1059 leaf = path->nodes[0];
1060 slot = path->slots[0];
1061 nritems = btrfs_header_nritems(leaf);
1062 if (slot >= nritems)
1065 btrfs_item_key_to_cpu(leaf, &key, slot);
1066 if (key.objectid != dir->i_ino ||
1067 key.type != BTRFS_INODE_REF_KEY) {
1070 location->objectid = key.offset;
1071 location->type = BTRFS_INODE_ITEM_KEY;
1072 location->offset = 0;
1076 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1080 if (!di || IS_ERR(di)) {
1083 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
1085 btrfs_free_path(path);
1088 location->objectid = 0;
1093 * when we hit a tree root in a directory, the btrfs part of the inode
1094 * needs to be changed to reflect the root directory of the tree root. This
1095 * is kind of like crossing a mount point.
1097 static int fixup_tree_root_location(struct btrfs_root *root,
1098 struct btrfs_key *location,
1099 struct btrfs_root **sub_root,
1100 struct dentry *dentry)
1102 struct btrfs_path *path;
1103 struct btrfs_root_item *ri;
1105 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1107 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1110 path = btrfs_alloc_path();
1112 mutex_lock(&root->fs_info->fs_mutex);
1114 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1115 dentry->d_name.name,
1116 dentry->d_name.len);
1117 if (IS_ERR(*sub_root))
1118 return PTR_ERR(*sub_root);
1120 ri = &(*sub_root)->root_item;
1121 location->objectid = btrfs_root_dirid(ri);
1122 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1123 location->offset = 0;
1125 btrfs_free_path(path);
1126 mutex_unlock(&root->fs_info->fs_mutex);
1130 static int btrfs_init_locked_inode(struct inode *inode, void *p)
1132 struct btrfs_iget_args *args = p;
1133 inode->i_ino = args->ino;
1134 BTRFS_I(inode)->root = args->root;
1135 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1136 inode->i_mapping, GFP_NOFS);
1140 static int btrfs_find_actor(struct inode *inode, void *opaque)
1142 struct btrfs_iget_args *args = opaque;
1143 return (args->ino == inode->i_ino &&
1144 args->root == BTRFS_I(inode)->root);
1147 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1148 struct btrfs_root *root)
1150 struct inode *inode;
1151 struct btrfs_iget_args args;
1152 args.ino = objectid;
1155 inode = iget5_locked(s, objectid, btrfs_find_actor,
1156 btrfs_init_locked_inode,
1161 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1162 struct nameidata *nd)
1164 struct inode * inode;
1165 struct btrfs_inode *bi = BTRFS_I(dir);
1166 struct btrfs_root *root = bi->root;
1167 struct btrfs_root *sub_root = root;
1168 struct btrfs_key location;
1171 if (dentry->d_name.len > BTRFS_NAME_LEN)
1172 return ERR_PTR(-ENAMETOOLONG);
1174 mutex_lock(&root->fs_info->fs_mutex);
1175 ret = btrfs_inode_by_name(dir, dentry, &location);
1176 mutex_unlock(&root->fs_info->fs_mutex);
1179 return ERR_PTR(ret);
1182 if (location.objectid) {
1183 ret = fixup_tree_root_location(root, &location, &sub_root,
1186 return ERR_PTR(ret);
1188 return ERR_PTR(-ENOENT);
1189 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1192 return ERR_PTR(-EACCES);
1193 if (inode->i_state & I_NEW) {
1194 /* the inode and parent dir are two different roots */
1195 if (sub_root != root) {
1197 sub_root->inode = inode;
1199 BTRFS_I(inode)->root = sub_root;
1200 memcpy(&BTRFS_I(inode)->location, &location,
1202 btrfs_read_locked_inode(inode);
1203 unlock_new_inode(inode);
1206 return d_splice_alias(inode, dentry);
1209 static unsigned char btrfs_filetype_table[] = {
1210 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1213 static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1215 struct inode *inode = filp->f_dentry->d_inode;
1216 struct btrfs_root *root = BTRFS_I(inode)->root;
1217 struct btrfs_item *item;
1218 struct btrfs_dir_item *di;
1219 struct btrfs_key key;
1220 struct btrfs_key found_key;
1221 struct btrfs_path *path;
1224 struct extent_buffer *leaf;
1227 unsigned char d_type;
1232 int key_type = BTRFS_DIR_INDEX_KEY;
1237 /* FIXME, use a real flag for deciding about the key type */
1238 if (root->fs_info->tree_root == root)
1239 key_type = BTRFS_DIR_ITEM_KEY;
1241 /* special case for "." */
1242 if (filp->f_pos == 0) {
1243 over = filldir(dirent, ".", 1,
1251 mutex_lock(&root->fs_info->fs_mutex);
1252 key.objectid = inode->i_ino;
1253 path = btrfs_alloc_path();
1256 /* special case for .., just use the back ref */
1257 if (filp->f_pos == 1) {
1258 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1260 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1262 leaf = path->nodes[0];
1263 slot = path->slots[0];
1264 nritems = btrfs_header_nritems(leaf);
1265 if (slot >= nritems) {
1266 btrfs_release_path(root, path);
1267 goto read_dir_items;
1269 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1270 btrfs_release_path(root, path);
1271 if (found_key.objectid != key.objectid ||
1272 found_key.type != BTRFS_INODE_REF_KEY)
1273 goto read_dir_items;
1274 over = filldir(dirent, "..", 2,
1275 2, found_key.offset, DT_DIR);
1282 btrfs_set_key_type(&key, key_type);
1283 key.offset = filp->f_pos;
1285 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1290 leaf = path->nodes[0];
1291 nritems = btrfs_header_nritems(leaf);
1292 slot = path->slots[0];
1293 if (advance || slot >= nritems) {
1294 if (slot >= nritems -1) {
1295 ret = btrfs_next_leaf(root, path);
1298 leaf = path->nodes[0];
1299 nritems = btrfs_header_nritems(leaf);
1300 slot = path->slots[0];
1307 item = btrfs_item_nr(leaf, slot);
1308 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1310 if (found_key.objectid != key.objectid)
1312 if (btrfs_key_type(&found_key) != key_type)
1314 if (found_key.offset < filp->f_pos)
1317 filp->f_pos = found_key.offset;
1319 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1321 di_total = btrfs_item_size(leaf, item);
1322 while(di_cur < di_total) {
1323 struct btrfs_key location;
1325 name_len = btrfs_dir_name_len(leaf, di);
1326 if (name_len < 32) {
1327 name_ptr = tmp_name;
1329 name_ptr = kmalloc(name_len, GFP_NOFS);
1332 read_extent_buffer(leaf, name_ptr,
1333 (unsigned long)(di + 1), name_len);
1335 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1336 btrfs_dir_item_key_to_cpu(leaf, di, &location);
1338 over = filldir(dirent, name_ptr, name_len,
1343 if (name_ptr != tmp_name)
1348 di_len = btrfs_dir_name_len(leaf, di) +
1349 btrfs_dir_data_len(leaf, di) +sizeof(*di);
1351 di = (struct btrfs_dir_item *)((char *)di + di_len);
1358 btrfs_release_path(root, path);
1359 btrfs_free_path(path);
1360 mutex_unlock(&root->fs_info->fs_mutex);
1364 int btrfs_write_inode(struct inode *inode, int wait)
1366 struct btrfs_root *root = BTRFS_I(inode)->root;
1367 struct btrfs_trans_handle *trans;
1371 mutex_lock(&root->fs_info->fs_mutex);
1372 trans = btrfs_start_transaction(root, 1);
1373 btrfs_set_trans_block_group(trans, inode);
1374 ret = btrfs_commit_transaction(trans, root);
1375 mutex_unlock(&root->fs_info->fs_mutex);
1381 * This is somewhat expensive, updating the tree every time the
1382 * inode changes. But, it is most likely to find the inode in cache.
1383 * FIXME, needs more benchmarking...there are no reasons other than performance
1384 * to keep or drop this code.
1386 void btrfs_dirty_inode(struct inode *inode)
1388 struct btrfs_root *root = BTRFS_I(inode)->root;
1389 struct btrfs_trans_handle *trans;
1391 mutex_lock(&root->fs_info->fs_mutex);
1392 trans = btrfs_start_transaction(root, 1);
1393 btrfs_set_trans_block_group(trans, inode);
1394 btrfs_update_inode(trans, root, inode);
1395 btrfs_end_transaction(trans, root);
1396 mutex_unlock(&root->fs_info->fs_mutex);
1399 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1400 struct btrfs_root *root,
1402 struct btrfs_block_group_cache *group,
1405 struct inode *inode;
1406 struct btrfs_inode_item *inode_item;
1407 struct btrfs_key *location;
1408 struct btrfs_path *path;
1412 path = btrfs_alloc_path();
1415 inode = new_inode(root->fs_info->sb);
1417 return ERR_PTR(-ENOMEM);
1419 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1420 inode->i_mapping, GFP_NOFS);
1421 BTRFS_I(inode)->root = root;
1427 group = btrfs_find_block_group(root, group, 0, 0, owner);
1428 BTRFS_I(inode)->block_group = group;
1430 ret = btrfs_insert_empty_inode(trans, root, path, objectid);
1434 inode->i_uid = current->fsuid;
1435 inode->i_gid = current->fsgid;
1436 inode->i_mode = mode;
1437 inode->i_ino = objectid;
1438 inode->i_blocks = 0;
1439 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1440 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1441 struct btrfs_inode_item);
1442 fill_inode_item(path->nodes[0], inode_item, inode);
1443 btrfs_mark_buffer_dirty(path->nodes[0]);
1444 btrfs_free_path(path);
1446 location = &BTRFS_I(inode)->location;
1447 location->objectid = objectid;
1448 location->offset = 0;
1449 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1451 insert_inode_hash(inode);
1454 btrfs_free_path(path);
1455 return ERR_PTR(ret);
1458 static inline u8 btrfs_inode_type(struct inode *inode)
1460 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1463 static int btrfs_add_link(struct btrfs_trans_handle *trans,
1464 struct dentry *dentry, struct inode *inode)
1467 struct btrfs_key key;
1468 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
1469 struct inode *parent_inode;
1471 key.objectid = inode->i_ino;
1472 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1475 ret = btrfs_insert_dir_item(trans, root,
1476 dentry->d_name.name, dentry->d_name.len,
1477 dentry->d_parent->d_inode->i_ino,
1478 &key, btrfs_inode_type(inode));
1480 ret = btrfs_insert_inode_ref(trans, root,
1481 dentry->d_name.name,
1484 dentry->d_parent->d_inode->i_ino);
1485 parent_inode = dentry->d_parent->d_inode;
1486 parent_inode->i_size += dentry->d_name.len * 2;
1487 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
1488 ret = btrfs_update_inode(trans, root,
1489 dentry->d_parent->d_inode);
1494 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1495 struct dentry *dentry, struct inode *inode)
1497 int err = btrfs_add_link(trans, dentry, inode);
1499 d_instantiate(dentry, inode);
1507 static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1508 int mode, dev_t rdev)
1510 struct btrfs_trans_handle *trans;
1511 struct btrfs_root *root = BTRFS_I(dir)->root;
1512 struct inode *inode = NULL;
1516 unsigned long nr = 0;
1518 if (!new_valid_dev(rdev))
1521 mutex_lock(&root->fs_info->fs_mutex);
1522 err = btrfs_check_free_space(root, 1, 0);
1526 trans = btrfs_start_transaction(root, 1);
1527 btrfs_set_trans_block_group(trans, dir);
1529 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1535 inode = btrfs_new_inode(trans, root, objectid,
1536 BTRFS_I(dir)->block_group, mode);
1537 err = PTR_ERR(inode);
1541 btrfs_set_trans_block_group(trans, inode);
1542 err = btrfs_add_nondir(trans, dentry, inode);
1546 inode->i_op = &btrfs_special_inode_operations;
1547 init_special_inode(inode, inode->i_mode, rdev);
1548 btrfs_update_inode(trans, root, inode);
1550 dir->i_sb->s_dirt = 1;
1551 btrfs_update_inode_block_group(trans, inode);
1552 btrfs_update_inode_block_group(trans, dir);
1554 nr = trans->blocks_used;
1555 btrfs_end_transaction(trans, root);
1557 mutex_unlock(&root->fs_info->fs_mutex);
1560 inode_dec_link_count(inode);
1563 btrfs_btree_balance_dirty(root, nr);
1567 static int btrfs_create(struct inode *dir, struct dentry *dentry,
1568 int mode, struct nameidata *nd)
1570 struct btrfs_trans_handle *trans;
1571 struct btrfs_root *root = BTRFS_I(dir)->root;
1572 struct inode *inode = NULL;
1575 unsigned long nr = 0;
1578 mutex_lock(&root->fs_info->fs_mutex);
1579 err = btrfs_check_free_space(root, 1, 0);
1582 trans = btrfs_start_transaction(root, 1);
1583 btrfs_set_trans_block_group(trans, dir);
1585 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1591 inode = btrfs_new_inode(trans, root, objectid,
1592 BTRFS_I(dir)->block_group, mode);
1593 err = PTR_ERR(inode);
1597 btrfs_set_trans_block_group(trans, inode);
1598 err = btrfs_add_nondir(trans, dentry, inode);
1602 inode->i_mapping->a_ops = &btrfs_aops;
1603 inode->i_fop = &btrfs_file_operations;
1604 inode->i_op = &btrfs_file_inode_operations;
1605 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1606 inode->i_mapping, GFP_NOFS);
1607 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
1609 dir->i_sb->s_dirt = 1;
1610 btrfs_update_inode_block_group(trans, inode);
1611 btrfs_update_inode_block_group(trans, dir);
1613 nr = trans->blocks_used;
1614 btrfs_end_transaction(trans, root);
1616 mutex_unlock(&root->fs_info->fs_mutex);
1619 inode_dec_link_count(inode);
1622 btrfs_btree_balance_dirty(root, nr);
1626 static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1627 struct dentry *dentry)
1629 struct btrfs_trans_handle *trans;
1630 struct btrfs_root *root = BTRFS_I(dir)->root;
1631 struct inode *inode = old_dentry->d_inode;
1632 unsigned long nr = 0;
1636 if (inode->i_nlink == 0)
1639 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1644 mutex_lock(&root->fs_info->fs_mutex);
1645 err = btrfs_check_free_space(root, 1, 0);
1648 trans = btrfs_start_transaction(root, 1);
1650 btrfs_set_trans_block_group(trans, dir);
1651 atomic_inc(&inode->i_count);
1652 err = btrfs_add_nondir(trans, dentry, inode);
1657 dir->i_sb->s_dirt = 1;
1658 btrfs_update_inode_block_group(trans, dir);
1659 err = btrfs_update_inode(trans, root, inode);
1664 nr = trans->blocks_used;
1665 btrfs_end_transaction(trans, root);
1667 mutex_unlock(&root->fs_info->fs_mutex);
1670 inode_dec_link_count(inode);
1673 btrfs_btree_balance_dirty(root, nr);
1677 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1679 struct inode *inode;
1680 struct btrfs_trans_handle *trans;
1681 struct btrfs_root *root = BTRFS_I(dir)->root;
1683 int drop_on_err = 0;
1685 unsigned long nr = 1;
1687 mutex_lock(&root->fs_info->fs_mutex);
1688 err = btrfs_check_free_space(root, 1, 0);
1692 trans = btrfs_start_transaction(root, 1);
1693 btrfs_set_trans_block_group(trans, dir);
1695 if (IS_ERR(trans)) {
1696 err = PTR_ERR(trans);
1700 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1706 inode = btrfs_new_inode(trans, root, objectid,
1707 BTRFS_I(dir)->block_group, S_IFDIR | mode);
1708 if (IS_ERR(inode)) {
1709 err = PTR_ERR(inode);
1714 inode->i_op = &btrfs_dir_inode_operations;
1715 inode->i_fop = &btrfs_dir_file_operations;
1716 btrfs_set_trans_block_group(trans, inode);
1719 err = btrfs_update_inode(trans, root, inode);
1723 err = btrfs_add_link(trans, dentry, inode);
1727 d_instantiate(dentry, inode);
1729 dir->i_sb->s_dirt = 1;
1730 btrfs_update_inode_block_group(trans, inode);
1731 btrfs_update_inode_block_group(trans, dir);
1734 nr = trans->blocks_used;
1735 btrfs_end_transaction(trans, root);
1738 mutex_unlock(&root->fs_info->fs_mutex);
1741 btrfs_btree_balance_dirty(root, nr);
1745 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1746 size_t page_offset, u64 start, u64 end,
1752 u64 extent_start = 0;
1754 u64 objectid = inode->i_ino;
1756 int failed_insert = 0;
1757 struct btrfs_path *path;
1758 struct btrfs_root *root = BTRFS_I(inode)->root;
1759 struct btrfs_file_extent_item *item;
1760 struct extent_buffer *leaf;
1761 struct btrfs_key found_key;
1762 struct extent_map *em = NULL;
1763 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1764 struct btrfs_trans_handle *trans = NULL;
1766 path = btrfs_alloc_path();
1768 mutex_lock(&root->fs_info->fs_mutex);
1771 em = lookup_extent_mapping(em_tree, start, end);
1776 em = alloc_extent_map(GFP_NOFS);
1781 em->start = EXTENT_MAP_HOLE;
1782 em->end = EXTENT_MAP_HOLE;
1784 em->bdev = inode->i_sb->s_bdev;
1785 ret = btrfs_lookup_file_extent(trans, root, path,
1786 objectid, start, trans != NULL);
1793 if (path->slots[0] == 0)
1798 leaf = path->nodes[0];
1799 item = btrfs_item_ptr(leaf, path->slots[0],
1800 struct btrfs_file_extent_item);
1801 /* are we inside the extent that was found? */
1802 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1803 found_type = btrfs_key_type(&found_key);
1804 if (found_key.objectid != objectid ||
1805 found_type != BTRFS_EXTENT_DATA_KEY) {
1809 found_type = btrfs_file_extent_type(leaf, item);
1810 extent_start = found_key.offset;
1811 if (found_type == BTRFS_FILE_EXTENT_REG) {
1812 extent_end = extent_start +
1813 btrfs_file_extent_num_bytes(leaf, item);
1815 if (start < extent_start || start >= extent_end) {
1817 if (start < extent_start) {
1818 if (end < extent_start)
1820 em->end = extent_end - 1;
1826 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
1828 em->start = extent_start;
1829 em->end = extent_end - 1;
1830 em->block_start = EXTENT_MAP_HOLE;
1831 em->block_end = EXTENT_MAP_HOLE;
1834 bytenr += btrfs_file_extent_offset(leaf, item);
1835 em->block_start = bytenr;
1836 em->block_end = em->block_start +
1837 btrfs_file_extent_num_bytes(leaf, item) - 1;
1838 em->start = extent_start;
1839 em->end = extent_end - 1;
1841 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
1845 size_t extent_offset;
1848 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
1850 extent_end = (extent_start + size - 1) |
1851 ((u64)root->sectorsize - 1);
1852 if (start < extent_start || start >= extent_end) {
1854 if (start < extent_start) {
1855 if (end < extent_start)
1857 em->end = extent_end;
1863 em->block_start = EXTENT_MAP_INLINE;
1864 em->block_end = EXTENT_MAP_INLINE;
1867 em->start = extent_start;
1868 em->end = extent_start + size - 1;
1872 extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) -
1873 extent_start + page_offset;
1874 copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset,
1875 size - extent_offset);
1876 em->start = extent_start + extent_offset;
1877 em->end = (em->start + copy_size -1) |
1878 ((u64)root->sectorsize -1);
1880 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
1881 if (create == 0 && !PageUptodate(page)) {
1882 read_extent_buffer(leaf, map + page_offset, ptr,
1884 flush_dcache_page(page);
1885 } else if (create && PageUptodate(page)) {
1888 free_extent_map(em);
1890 btrfs_release_path(root, path);
1891 trans = btrfs_start_transaction(root, 1);
1894 write_extent_buffer(leaf, map + page_offset, ptr,
1896 btrfs_mark_buffer_dirty(leaf);
1899 set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS);
1902 printk("unkknown found_type %d\n", found_type);
1909 em->block_start = EXTENT_MAP_HOLE;
1910 em->block_end = EXTENT_MAP_HOLE;
1912 btrfs_release_path(root, path);
1913 if (em->start > start || em->end < start) {
1914 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end);
1918 ret = add_extent_mapping(em_tree, em);
1919 if (ret == -EEXIST) {
1920 free_extent_map(em);
1922 if (0 && failed_insert == 1) {
1923 btrfs_drop_extent_cache(inode, start, end);
1926 if (failed_insert > 5) {
1927 printk("failing to insert %Lu %Lu\n", start, end);
1935 btrfs_free_path(path);
1937 ret = btrfs_end_transaction(trans, root);
1941 mutex_unlock(&root->fs_info->fs_mutex);
1943 free_extent_map(em);
1945 return ERR_PTR(err);
1950 static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
1952 return extent_bmap(mapping, iblock, btrfs_get_extent);
1955 static int btrfs_prepare_write(struct file *file, struct page *page,
1956 unsigned from, unsigned to)
1958 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
1961 mutex_lock(&root->fs_info->fs_mutex);
1962 err = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
1963 mutex_unlock(&root->fs_info->fs_mutex);
1967 return extent_prepare_write(&BTRFS_I(page->mapping->host)->extent_tree,
1968 page->mapping->host, page, from, to,
1972 int btrfs_readpage(struct file *file, struct page *page)
1974 struct extent_map_tree *tree;
1975 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1976 return extent_read_full_page(tree, page, btrfs_get_extent);
1979 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
1981 struct extent_map_tree *tree;
1984 if (current->flags & PF_MEMALLOC) {
1985 redirty_page_for_writepage(wbc, page);
1989 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1990 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
1993 static int btrfs_writepages(struct address_space *mapping,
1994 struct writeback_control *wbc)
1996 struct extent_map_tree *tree;
1997 tree = &BTRFS_I(mapping->host)->extent_tree;
1998 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2002 btrfs_readpages(struct file *file, struct address_space *mapping,
2003 struct list_head *pages, unsigned nr_pages)
2005 struct extent_map_tree *tree;
2006 tree = &BTRFS_I(mapping->host)->extent_tree;
2007 return extent_readpages(tree, mapping, pages, nr_pages,
2011 static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
2013 struct extent_map_tree *tree;
2016 tree = &BTRFS_I(page->mapping->host)->extent_tree;
2017 ret = try_release_extent_mapping(tree, page);
2019 ClearPagePrivate(page);
2020 set_page_private(page, 0);
2021 page_cache_release(page);
2026 static void btrfs_invalidatepage(struct page *page, unsigned long offset)
2028 struct extent_map_tree *tree;
2030 tree = &BTRFS_I(page->mapping->host)->extent_tree;
2031 extent_invalidatepage(tree, page, offset);
2032 btrfs_releasepage(page, GFP_NOFS);
2036 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2037 * called from a page fault handler when a page is first dirtied. Hence we must
2038 * be careful to check for EOF conditions here. We set the page up correctly
2039 * for a written page which means we get ENOSPC checking when writing into
2040 * holes and correct delalloc and unwritten extent mapping on filesystems that
2041 * support these features.
2043 * We are not allowed to take the i_mutex here so we have to play games to
2044 * protect against truncate races as the page could now be beyond EOF. Because
2045 * vmtruncate() writes the inode size before removing pages, once we have the
2046 * page lock we can determine safely if the page is beyond EOF. If it is not
2047 * beyond EOF, then the page is guaranteed safe against truncation until we
2050 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2052 struct inode *inode = fdentry(vma->vm_file)->d_inode;
2053 struct btrfs_root *root = BTRFS_I(inode)->root;
2059 mutex_lock(&root->fs_info->fs_mutex);
2060 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
2061 mutex_unlock(&root->fs_info->fs_mutex);
2067 down_read(&BTRFS_I(inode)->root->snap_sem);
2069 wait_on_page_writeback(page);
2070 size = i_size_read(inode);
2071 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2073 if ((page->mapping != inode->i_mapping) ||
2074 (page_start > size)) {
2075 /* page got truncated out from underneath us */
2079 /* page is wholly or partially inside EOF */
2080 if (page_start + PAGE_CACHE_SIZE > size)
2081 end = size & ~PAGE_CACHE_MASK;
2083 end = PAGE_CACHE_SIZE;
2085 ret = btrfs_cow_one_page(inode, page, end);
2088 up_read(&BTRFS_I(inode)->root->snap_sem);
2094 static void btrfs_truncate(struct inode *inode)
2096 struct btrfs_root *root = BTRFS_I(inode)->root;
2098 struct btrfs_trans_handle *trans;
2101 if (!S_ISREG(inode->i_mode))
2103 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2106 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2108 mutex_lock(&root->fs_info->fs_mutex);
2109 trans = btrfs_start_transaction(root, 1);
2110 btrfs_set_trans_block_group(trans, inode);
2112 /* FIXME, add redo link to tree so we don't leak on crash */
2113 ret = btrfs_truncate_in_trans(trans, root, inode);
2114 btrfs_update_inode(trans, root, inode);
2115 nr = trans->blocks_used;
2117 ret = btrfs_end_transaction(trans, root);
2119 mutex_unlock(&root->fs_info->fs_mutex);
2120 btrfs_btree_balance_dirty(root, nr);
2123 int btrfs_commit_write(struct file *file, struct page *page,
2124 unsigned from, unsigned to)
2126 loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
2127 struct inode *inode = page->mapping->host;
2129 btrfs_cow_one_page(inode, page, PAGE_CACHE_SIZE);
2131 if (pos > inode->i_size) {
2132 i_size_write(inode, pos);
2133 mark_inode_dirty(inode);
2138 static int create_subvol(struct btrfs_root *root, char *name, int namelen)
2140 struct btrfs_trans_handle *trans;
2141 struct btrfs_key key;
2142 struct btrfs_root_item root_item;
2143 struct btrfs_inode_item *inode_item;
2144 struct extent_buffer *leaf;
2145 struct btrfs_root *new_root;
2146 struct inode *inode;
2151 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
2152 unsigned long nr = 1;
2154 mutex_lock(&root->fs_info->fs_mutex);
2155 ret = btrfs_check_free_space(root, 1, 0);
2159 trans = btrfs_start_transaction(root, 1);
2162 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2167 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2168 objectid, trans->transid, 0, 0,
2171 return PTR_ERR(leaf);
2173 btrfs_set_header_nritems(leaf, 0);
2174 btrfs_set_header_level(leaf, 0);
2175 btrfs_set_header_bytenr(leaf, leaf->start);
2176 btrfs_set_header_generation(leaf, trans->transid);
2177 btrfs_set_header_owner(leaf, objectid);
2179 write_extent_buffer(leaf, root->fs_info->fsid,
2180 (unsigned long)btrfs_header_fsid(leaf),
2182 btrfs_mark_buffer_dirty(leaf);
2184 inode_item = &root_item.inode;
2185 memset(inode_item, 0, sizeof(*inode_item));
2186 inode_item->generation = cpu_to_le64(1);
2187 inode_item->size = cpu_to_le64(3);
2188 inode_item->nlink = cpu_to_le32(1);
2189 inode_item->nblocks = cpu_to_le64(1);
2190 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
2192 btrfs_set_root_bytenr(&root_item, leaf->start);
2193 btrfs_set_root_level(&root_item, 0);
2194 btrfs_set_root_refs(&root_item, 1);
2195 btrfs_set_root_used(&root_item, 0);
2197 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2198 root_item.drop_level = 0;
2200 free_extent_buffer(leaf);
2203 btrfs_set_root_dirid(&root_item, new_dirid);
2205 key.objectid = objectid;
2207 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2208 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2214 * insert the directory item
2216 key.offset = (u64)-1;
2217 dir = root->fs_info->sb->s_root->d_inode;
2218 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2219 name, namelen, dir->i_ino, &key,
2224 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2225 name, namelen, objectid,
2226 root->fs_info->sb->s_root->d_inode->i_ino);
2230 ret = btrfs_commit_transaction(trans, root);
2234 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
2237 trans = btrfs_start_transaction(new_root, 1);
2240 inode = btrfs_new_inode(trans, new_root, new_dirid,
2241 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
2244 inode->i_op = &btrfs_dir_inode_operations;
2245 inode->i_fop = &btrfs_dir_file_operations;
2246 new_root->inode = inode;
2248 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2252 ret = btrfs_update_inode(trans, new_root, inode);
2256 nr = trans->blocks_used;
2257 err = btrfs_commit_transaction(trans, root);
2261 mutex_unlock(&root->fs_info->fs_mutex);
2262 btrfs_btree_balance_dirty(root, nr);
2266 static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2268 struct btrfs_trans_handle *trans;
2269 struct btrfs_key key;
2270 struct btrfs_root_item new_root_item;
2271 struct extent_buffer *tmp;
2275 unsigned long nr = 0;
2277 if (!root->ref_cows)
2280 down_write(&root->snap_sem);
2281 freeze_bdev(root->fs_info->sb->s_bdev);
2282 thaw_bdev(root->fs_info->sb->s_bdev, root->fs_info->sb);
2284 mutex_lock(&root->fs_info->fs_mutex);
2285 ret = btrfs_check_free_space(root, 1, 0);
2289 trans = btrfs_start_transaction(root, 1);
2292 ret = btrfs_update_inode(trans, root, root->inode);
2296 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2301 memcpy(&new_root_item, &root->root_item,
2302 sizeof(new_root_item));
2304 key.objectid = objectid;
2306 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2308 extent_buffer_get(root->node);
2309 btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp);
2310 free_extent_buffer(tmp);
2312 btrfs_copy_root(trans, root, root->node, &tmp, objectid);
2314 btrfs_set_root_bytenr(&new_root_item, tmp->start);
2315 btrfs_set_root_level(&new_root_item, btrfs_header_level(tmp));
2316 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2318 free_extent_buffer(tmp);
2323 * insert the directory item
2325 key.offset = (u64)-1;
2326 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2328 root->fs_info->sb->s_root->d_inode->i_ino,
2329 &key, BTRFS_FT_DIR);
2334 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2335 name, namelen, objectid,
2336 root->fs_info->sb->s_root->d_inode->i_ino);
2341 nr = trans->blocks_used;
2342 err = btrfs_commit_transaction(trans, root);
2347 mutex_unlock(&root->fs_info->fs_mutex);
2348 up_write(&root->snap_sem);
2349 btrfs_btree_balance_dirty(root, nr);
2353 unsigned long btrfs_force_ra(struct address_space *mapping,
2354 struct file_ra_state *ra, struct file *file,
2355 pgoff_t offset, pgoff_t last_index)
2359 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2360 req_size = last_index - offset + 1;
2361 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2364 req_size = min(last_index - offset + 1, (pgoff_t)128);
2365 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2366 return offset + req_size;
2370 int btrfs_defrag_file(struct file *file) {
2371 struct inode *inode = fdentry(file)->d_inode;
2372 struct btrfs_root *root = BTRFS_I(inode)->root;
2373 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
2375 unsigned long last_index;
2376 unsigned long ra_index = 0;
2380 u64 existing_delalloc;
2384 mutex_lock(&root->fs_info->fs_mutex);
2385 ret = btrfs_check_free_space(root, inode->i_size, 0);
2386 mutex_unlock(&root->fs_info->fs_mutex);
2390 mutex_lock(&inode->i_mutex);
2391 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2392 for (i = 0; i <= last_index; i++) {
2393 if (i == ra_index) {
2394 ra_index = btrfs_force_ra(inode->i_mapping,
2396 file, ra_index, last_index);
2398 page = grab_cache_page(inode->i_mapping, i);
2401 if (!PageUptodate(page)) {
2402 btrfs_readpage(NULL, page);
2404 if (!PageUptodate(page)) {
2406 page_cache_release(page);
2410 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2411 page_end = page_start + PAGE_CACHE_SIZE - 1;
2413 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
2414 delalloc_start = page_start;
2416 count_range_bits(&BTRFS_I(inode)->extent_tree,
2417 &delalloc_start, page_end,
2418 PAGE_CACHE_SIZE, EXTENT_DELALLOC);
2419 set_extent_delalloc(em_tree, page_start,
2420 page_end, GFP_NOFS);
2422 spin_lock(&root->fs_info->delalloc_lock);
2423 root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE -
2425 spin_unlock(&root->fs_info->delalloc_lock);
2427 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
2428 set_page_dirty(page);
2430 page_cache_release(page);
2431 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2435 mutex_unlock(&inode->i_mutex);
2439 static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2443 struct btrfs_ioctl_vol_args *vol_args;
2444 struct btrfs_trans_handle *trans;
2450 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2455 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2459 namelen = strlen(vol_args->name);
2460 if (namelen > BTRFS_VOL_NAME_MAX) {
2465 sizestr = vol_args->name;
2466 if (!strcmp(sizestr, "max"))
2467 new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
2469 if (sizestr[0] == '-') {
2472 } else if (sizestr[0] == '+') {
2476 new_size = btrfs_parse_size(sizestr);
2477 if (new_size == 0) {
2483 mutex_lock(&root->fs_info->fs_mutex);
2484 old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);
2487 if (new_size > old_size) {
2491 new_size = old_size - new_size;
2492 } else if (mod > 0) {
2493 new_size = old_size + new_size;
2496 if (new_size < 256 * 1024 * 1024) {
2500 if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
2504 new_size = (new_size / root->sectorsize) * root->sectorsize;
2506 printk("new size is %Lu\n", new_size);
2507 if (new_size > old_size) {
2508 trans = btrfs_start_transaction(root, 1);
2509 ret = btrfs_grow_extent_tree(trans, root, new_size);
2510 btrfs_commit_transaction(trans, root);
2512 ret = btrfs_shrink_extent_tree(root, new_size);
2516 mutex_unlock(&root->fs_info->fs_mutex);
2522 static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg)
2524 struct btrfs_ioctl_vol_args *vol_args;
2525 struct btrfs_dir_item *di;
2526 struct btrfs_path *path;
2531 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2536 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2541 namelen = strlen(vol_args->name);
2542 if (namelen > BTRFS_VOL_NAME_MAX) {
2546 if (strchr(vol_args->name, '/')) {
2551 path = btrfs_alloc_path();
2557 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2558 mutex_lock(&root->fs_info->fs_mutex);
2559 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2561 vol_args->name, namelen, 0);
2562 mutex_unlock(&root->fs_info->fs_mutex);
2563 btrfs_free_path(path);
2565 if (di && !IS_ERR(di)) {
2575 if (root == root->fs_info->tree_root)
2576 ret = create_subvol(root, vol_args->name, namelen);
2578 ret = create_snapshot(root, vol_args->name, namelen);
2584 static int btrfs_ioctl_defrag(struct file *file)
2586 struct inode *inode = fdentry(file)->d_inode;
2587 struct btrfs_root *root = BTRFS_I(inode)->root;
2589 switch (inode->i_mode & S_IFMT) {
2591 mutex_lock(&root->fs_info->fs_mutex);
2592 btrfs_defrag_root(root, 0);
2593 btrfs_defrag_root(root->fs_info->extent_root, 0);
2594 mutex_unlock(&root->fs_info->fs_mutex);
2597 btrfs_defrag_file(file);
2604 long btrfs_ioctl(struct file *file, unsigned int
2605 cmd, unsigned long arg)
2607 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
2610 case BTRFS_IOC_SNAP_CREATE:
2611 return btrfs_ioctl_snap_create(root, (void __user *)arg);
2612 case BTRFS_IOC_DEFRAG:
2613 return btrfs_ioctl_defrag(file);
2614 case BTRFS_IOC_RESIZE:
2615 return btrfs_ioctl_resize(root, (void __user *)arg);
2622 * Called inside transaction, so use GFP_NOFS
2624 struct inode *btrfs_alloc_inode(struct super_block *sb)
2626 struct btrfs_inode *ei;
2628 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2632 return &ei->vfs_inode;
2635 void btrfs_destroy_inode(struct inode *inode)
2637 WARN_ON(!list_empty(&inode->i_dentry));
2638 WARN_ON(inode->i_data.nrpages);
2640 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2643 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2644 static void init_once(struct kmem_cache * cachep, void *foo)
2646 static void init_once(void * foo, struct kmem_cache * cachep,
2647 unsigned long flags)
2650 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2652 inode_init_once(&ei->vfs_inode);
2655 void btrfs_destroy_cachep(void)
2657 if (btrfs_inode_cachep)
2658 kmem_cache_destroy(btrfs_inode_cachep);
2659 if (btrfs_trans_handle_cachep)
2660 kmem_cache_destroy(btrfs_trans_handle_cachep);
2661 if (btrfs_transaction_cachep)
2662 kmem_cache_destroy(btrfs_transaction_cachep);
2663 if (btrfs_bit_radix_cachep)
2664 kmem_cache_destroy(btrfs_bit_radix_cachep);
2665 if (btrfs_path_cachep)
2666 kmem_cache_destroy(btrfs_path_cachep);
2669 struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
2670 unsigned long extra_flags,
2671 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2672 void (*ctor)(struct kmem_cache *, void *)
2674 void (*ctor)(void *, struct kmem_cache *,
2679 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2680 SLAB_MEM_SPREAD | extra_flags), ctor
2681 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2687 int btrfs_init_cachep(void)
2689 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
2690 sizeof(struct btrfs_inode),
2692 if (!btrfs_inode_cachep)
2694 btrfs_trans_handle_cachep =
2695 btrfs_cache_create("btrfs_trans_handle_cache",
2696 sizeof(struct btrfs_trans_handle),
2698 if (!btrfs_trans_handle_cachep)
2700 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
2701 sizeof(struct btrfs_transaction),
2703 if (!btrfs_transaction_cachep)
2705 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
2706 sizeof(struct btrfs_path),
2708 if (!btrfs_path_cachep)
2710 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
2711 SLAB_DESTROY_BY_RCU, NULL);
2712 if (!btrfs_bit_radix_cachep)
2716 btrfs_destroy_cachep();
2720 static int btrfs_getattr(struct vfsmount *mnt,
2721 struct dentry *dentry, struct kstat *stat)
2723 struct inode *inode = dentry->d_inode;
2724 generic_fillattr(inode, stat);
2725 stat->blksize = 256 * 1024;
2729 static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
2730 struct inode * new_dir,struct dentry *new_dentry)
2732 struct btrfs_trans_handle *trans;
2733 struct btrfs_root *root = BTRFS_I(old_dir)->root;
2734 struct inode *new_inode = new_dentry->d_inode;
2735 struct inode *old_inode = old_dentry->d_inode;
2736 struct timespec ctime = CURRENT_TIME;
2737 struct btrfs_path *path;
2740 if (S_ISDIR(old_inode->i_mode) && new_inode &&
2741 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
2745 mutex_lock(&root->fs_info->fs_mutex);
2746 ret = btrfs_check_free_space(root, 1, 0);
2750 trans = btrfs_start_transaction(root, 1);
2752 btrfs_set_trans_block_group(trans, new_dir);
2753 path = btrfs_alloc_path();
2759 old_dentry->d_inode->i_nlink++;
2760 old_dir->i_ctime = old_dir->i_mtime = ctime;
2761 new_dir->i_ctime = new_dir->i_mtime = ctime;
2762 old_inode->i_ctime = ctime;
2764 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
2769 new_inode->i_ctime = CURRENT_TIME;
2770 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
2774 ret = btrfs_add_link(trans, new_dentry, old_inode);
2779 btrfs_free_path(path);
2780 btrfs_end_transaction(trans, root);
2782 mutex_unlock(&root->fs_info->fs_mutex);
2786 static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
2787 const char *symname)
2789 struct btrfs_trans_handle *trans;
2790 struct btrfs_root *root = BTRFS_I(dir)->root;
2791 struct btrfs_path *path;
2792 struct btrfs_key key;
2793 struct inode *inode = NULL;
2800 struct btrfs_file_extent_item *ei;
2801 struct extent_buffer *leaf;
2802 unsigned long nr = 0;
2804 name_len = strlen(symname) + 1;
2805 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
2806 return -ENAMETOOLONG;
2808 mutex_lock(&root->fs_info->fs_mutex);
2809 err = btrfs_check_free_space(root, 1, 0);
2813 trans = btrfs_start_transaction(root, 1);
2814 btrfs_set_trans_block_group(trans, dir);
2816 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2822 inode = btrfs_new_inode(trans, root, objectid,
2823 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
2824 err = PTR_ERR(inode);
2828 btrfs_set_trans_block_group(trans, inode);
2829 err = btrfs_add_nondir(trans, dentry, inode);
2833 inode->i_mapping->a_ops = &btrfs_aops;
2834 inode->i_fop = &btrfs_file_operations;
2835 inode->i_op = &btrfs_file_inode_operations;
2836 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
2837 inode->i_mapping, GFP_NOFS);
2838 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
2840 dir->i_sb->s_dirt = 1;
2841 btrfs_update_inode_block_group(trans, inode);
2842 btrfs_update_inode_block_group(trans, dir);
2846 path = btrfs_alloc_path();
2848 key.objectid = inode->i_ino;
2850 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2851 datasize = btrfs_file_extent_calc_inline_size(name_len);
2852 err = btrfs_insert_empty_item(trans, root, path, &key,
2858 leaf = path->nodes[0];
2859 ei = btrfs_item_ptr(leaf, path->slots[0],
2860 struct btrfs_file_extent_item);
2861 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
2862 btrfs_set_file_extent_type(leaf, ei,
2863 BTRFS_FILE_EXTENT_INLINE);
2864 ptr = btrfs_file_extent_inline_start(ei);
2865 write_extent_buffer(leaf, symname, ptr, name_len);
2866 btrfs_mark_buffer_dirty(leaf);
2867 btrfs_free_path(path);
2869 inode->i_op = &btrfs_symlink_inode_operations;
2870 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2871 inode->i_size = name_len - 1;
2872 err = btrfs_update_inode(trans, root, inode);
2877 nr = trans->blocks_used;
2878 btrfs_end_transaction(trans, root);
2880 mutex_unlock(&root->fs_info->fs_mutex);
2882 inode_dec_link_count(inode);
2885 btrfs_btree_balance_dirty(root, nr);
2889 static struct inode_operations btrfs_dir_inode_operations = {
2890 .lookup = btrfs_lookup,
2891 .create = btrfs_create,
2892 .unlink = btrfs_unlink,
2894 .mkdir = btrfs_mkdir,
2895 .rmdir = btrfs_rmdir,
2896 .rename = btrfs_rename,
2897 .symlink = btrfs_symlink,
2898 .setattr = btrfs_setattr,
2899 .mknod = btrfs_mknod,
2900 .setxattr = generic_setxattr,
2901 .getxattr = generic_getxattr,
2902 .listxattr = btrfs_listxattr,
2903 .removexattr = generic_removexattr,
2906 static struct inode_operations btrfs_dir_ro_inode_operations = {
2907 .lookup = btrfs_lookup,
2910 static struct file_operations btrfs_dir_file_operations = {
2911 .llseek = generic_file_llseek,
2912 .read = generic_read_dir,
2913 .readdir = btrfs_readdir,
2914 .unlocked_ioctl = btrfs_ioctl,
2915 #ifdef CONFIG_COMPAT
2916 .compat_ioctl = btrfs_ioctl,
2920 static struct extent_map_ops btrfs_extent_map_ops = {
2921 .fill_delalloc = run_delalloc_range,
2922 .writepage_io_hook = btrfs_writepage_io_hook,
2923 .readpage_io_hook = btrfs_readpage_io_hook,
2924 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
2927 static struct address_space_operations btrfs_aops = {
2928 .readpage = btrfs_readpage,
2929 .writepage = btrfs_writepage,
2930 .writepages = btrfs_writepages,
2931 .readpages = btrfs_readpages,
2932 .sync_page = block_sync_page,
2933 .prepare_write = btrfs_prepare_write,
2934 .commit_write = btrfs_commit_write,
2936 .invalidatepage = btrfs_invalidatepage,
2937 .releasepage = btrfs_releasepage,
2938 .set_page_dirty = __set_page_dirty_nobuffers,
2941 static struct address_space_operations btrfs_symlink_aops = {
2942 .readpage = btrfs_readpage,
2943 .writepage = btrfs_writepage,
2944 .invalidatepage = btrfs_invalidatepage,
2945 .releasepage = btrfs_releasepage,
2948 static struct inode_operations btrfs_file_inode_operations = {
2949 .truncate = btrfs_truncate,
2950 .getattr = btrfs_getattr,
2951 .setattr = btrfs_setattr,
2952 .setxattr = generic_setxattr,
2953 .getxattr = generic_getxattr,
2954 .listxattr = btrfs_listxattr,
2955 .removexattr = generic_removexattr,
2958 static struct inode_operations btrfs_special_inode_operations = {
2959 .getattr = btrfs_getattr,
2960 .setattr = btrfs_setattr,
2963 static struct inode_operations btrfs_symlink_inode_operations = {
2964 .readlink = generic_readlink,
2965 .follow_link = page_follow_link_light,
2966 .put_link = page_put_link,