1 #include <linux/module.h>
2 #include <linux/buffer_head.h>
4 #include <linux/pagemap.h>
5 #include <linux/highmem.h>
6 #include <linux/time.h>
7 #include <linux/init.h>
8 #include <linux/string.h>
9 #include <linux/smp_lock.h>
10 #include <linux/backing-dev.h>
11 #include <linux/mpage.h>
14 #include "transaction.h"
16 #define BTRFS_SUPER_MAGIC 0x9123682E
18 static struct inode_operations btrfs_dir_inode_operations;
19 static struct super_operations btrfs_super_ops;
20 static struct file_operations btrfs_dir_file_operations;
21 static struct inode_operations btrfs_file_inode_operations;
22 static struct address_space_operations btrfs_aops;
23 static struct file_operations btrfs_file_operations;
25 static void btrfs_read_locked_inode(struct inode *inode)
27 struct btrfs_path path;
28 struct btrfs_inode_item *inode_item;
29 struct btrfs_root *root = btrfs_sb(inode->i_sb);
32 btrfs_init_path(&path);
33 mutex_lock(&root->fs_info->fs_mutex);
35 ret = btrfs_lookup_inode(NULL, root, &path, inode->i_ino, 0);
37 btrfs_release_path(root, &path);
38 mutex_unlock(&root->fs_info->fs_mutex);
39 make_bad_inode(inode);
42 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
44 struct btrfs_inode_item);
46 inode->i_mode = btrfs_inode_mode(inode_item);
47 inode->i_nlink = btrfs_inode_nlink(inode_item);
48 inode->i_uid = btrfs_inode_uid(inode_item);
49 inode->i_gid = btrfs_inode_gid(inode_item);
50 inode->i_size = btrfs_inode_size(inode_item);
51 inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime);
52 inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime);
53 inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime);
54 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime);
55 inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime);
56 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);
57 inode->i_blocks = btrfs_inode_nblocks(inode_item);
58 inode->i_generation = btrfs_inode_generation(inode_item);
59 btrfs_release_path(root, &path);
60 mutex_unlock(&root->fs_info->fs_mutex);
61 switch (inode->i_mode & S_IFMT) {
64 init_special_inode(inode, inode->i_mode,
65 btrfs_inode_rdev(inode_item));
69 inode->i_mapping->a_ops = &btrfs_aops;
70 inode->i_fop = &btrfs_file_operations;
71 inode->i_op = &btrfs_file_inode_operations;
74 inode->i_op = &btrfs_dir_inode_operations;
75 inode->i_fop = &btrfs_dir_file_operations;
78 // inode->i_op = &page_symlink_inode_operations;
84 static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
85 struct btrfs_root *root,
87 struct dentry *dentry)
89 struct btrfs_path path;
90 const char *name = dentry->d_name.name;
91 int name_len = dentry->d_name.len;
94 struct btrfs_dir_item *di;
96 btrfs_init_path(&path);
97 ret = btrfs_lookup_dir_item(trans, root, &path, dir->i_ino,
105 di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
106 struct btrfs_dir_item);
107 objectid = btrfs_dir_objectid(di);
109 ret = btrfs_del_item(trans, root, &path);
111 dentry->d_inode->i_ctime = dir->i_ctime;
113 btrfs_release_path(root, &path);
115 inode_dec_link_count(dentry->d_inode);
119 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
121 struct btrfs_root *root;
122 struct btrfs_trans_handle *trans;
125 root = btrfs_sb(dir->i_sb);
126 mutex_lock(&root->fs_info->fs_mutex);
127 trans = btrfs_start_transaction(root, 1);
128 ret = btrfs_unlink_trans(trans, root, dir, dentry);
129 btrfs_end_transaction(trans, root);
130 mutex_unlock(&root->fs_info->fs_mutex);
134 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
136 struct inode *inode = dentry->d_inode;
139 struct btrfs_root *root = btrfs_sb(dir->i_sb);
140 struct btrfs_path path;
141 struct btrfs_key key;
142 struct btrfs_trans_handle *trans;
143 struct btrfs_disk_key *found_key;
144 struct btrfs_leaf *leaf;
146 btrfs_init_path(&path);
147 mutex_lock(&root->fs_info->fs_mutex);
148 trans = btrfs_start_transaction(root, 1);
149 key.objectid = inode->i_ino;
150 key.offset = (u64)-1;
152 btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
153 ret = btrfs_search_slot(trans, root, &key, &path, -1, 1);
160 BUG_ON(path.slots[0] == 0);
162 leaf = btrfs_buffer_leaf(path.nodes[0]);
163 found_key = &leaf->items[path.slots[0]].key;
164 if (btrfs_disk_key_objectid(found_key) != inode->i_ino) {
168 if (btrfs_disk_key_type(found_key) != BTRFS_DIR_ITEM_KEY ||
169 btrfs_disk_key_offset(found_key) != 2) {
173 ret = btrfs_del_item(trans, root, &path);
175 btrfs_release_path(root, &path);
177 ret = btrfs_search_slot(trans, root, &key, &path, -1, 1);
186 ret = btrfs_del_item(trans, root, &path);
191 btrfs_release_path(root, &path);
193 /* now the directory is empty */
194 err = btrfs_unlink_trans(trans, root, dir, dentry);
199 mutex_unlock(&root->fs_info->fs_mutex);
200 ret = btrfs_end_transaction(trans, root);
206 static int btrfs_free_inode(struct btrfs_trans_handle *trans,
207 struct btrfs_root *root,
210 u64 objectid = inode->i_ino;
211 struct btrfs_path path;
212 struct btrfs_inode_map_item *map;
213 struct btrfs_key stat_data_key;
216 btrfs_init_path(&path);
217 ret = btrfs_lookup_inode_map(trans, root, &path, objectid, -1);
221 btrfs_release_path(root, &path);
224 map = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
225 struct btrfs_inode_map_item);
226 btrfs_disk_key_to_cpu(&stat_data_key, &map->key);
227 ret = btrfs_del_item(trans, root->fs_info->inode_root, &path);
229 btrfs_release_path(root, &path);
230 btrfs_init_path(&path);
232 ret = btrfs_lookup_inode(trans, root, &path, objectid, -1);
234 ret = btrfs_del_item(trans, root, &path);
236 btrfs_release_path(root, &path);
241 static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
242 struct btrfs_root *root,
246 struct btrfs_path path;
247 struct btrfs_key key;
248 struct btrfs_disk_key *found_key;
249 struct btrfs_leaf *leaf;
250 struct btrfs_file_extent_item *fi;
252 u64 extent_num_blocks;
254 /* FIXME, add redo link to tree so we don't leak on crash */
255 key.objectid = inode->i_ino;
256 key.offset = (u64)-1;
258 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
260 btrfs_init_path(&path);
261 ret = btrfs_search_slot(trans, root, &key, &path, -1, 1);
263 btrfs_release_path(root, &path);
267 BUG_ON(path.slots[0] == 0);
270 leaf = btrfs_buffer_leaf(path.nodes[0]);
271 found_key = &leaf->items[path.slots[0]].key;
272 if (btrfs_disk_key_objectid(found_key) != inode->i_ino)
274 if (btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY)
276 if (btrfs_disk_key_offset(found_key) < inode->i_size)
278 fi = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
280 struct btrfs_file_extent_item);
281 extent_start = btrfs_file_extent_disk_blocknr(fi);
282 extent_num_blocks = btrfs_file_extent_disk_num_blocks(fi);
283 key.offset = btrfs_disk_key_offset(found_key) - 1;
284 ret = btrfs_del_item(trans, root, &path);
286 inode->i_blocks -= btrfs_file_extent_num_blocks(fi) >> 9;
287 btrfs_release_path(root, &path);
288 ret = btrfs_free_extent(trans, root, extent_start,
289 extent_num_blocks, 0);
291 if (key.offset + 1 == 0)
294 btrfs_release_path(root, &path);
300 static void btrfs_delete_inode(struct inode *inode)
302 struct btrfs_trans_handle *trans;
303 struct btrfs_root *root = btrfs_sb(inode->i_sb);
306 truncate_inode_pages(&inode->i_data, 0);
307 if (is_bad_inode(inode)) {
311 mutex_lock(&root->fs_info->fs_mutex);
312 trans = btrfs_start_transaction(root, 1);
313 if (S_ISREG(inode->i_mode)) {
314 ret = btrfs_truncate_in_trans(trans, root, inode);
317 btrfs_free_inode(trans, root, inode);
318 btrfs_end_transaction(trans, root);
319 mutex_unlock(&root->fs_info->fs_mutex);
325 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
328 const char *name = dentry->d_name.name;
329 int namelen = dentry->d_name.len;
330 struct btrfs_dir_item *di;
331 struct btrfs_path path;
332 struct btrfs_root *root = btrfs_sb(dir->i_sb);
335 btrfs_init_path(&path);
336 ret = btrfs_lookup_dir_item(NULL, root, &path, dir->i_ino, name,
338 if (ret || !btrfs_match_dir_item_name(root, &path, name, namelen)) {
342 di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
343 struct btrfs_dir_item);
344 *ino = btrfs_dir_objectid(di);
346 btrfs_release_path(root, &path);
350 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
351 struct nameidata *nd)
353 struct inode * inode;
357 if (dentry->d_name.len > BTRFS_NAME_LEN)
358 return ERR_PTR(-ENAMETOOLONG);
360 ret = btrfs_inode_by_name(dir, dentry, &ino);
365 inode = iget(dir->i_sb, ino);
367 return ERR_PTR(-EACCES);
369 return d_splice_alias(inode, dentry);
372 static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
374 struct inode *inode = filp->f_path.dentry->d_inode;
375 struct btrfs_root *root = btrfs_sb(inode->i_sb);
376 struct btrfs_item *item;
377 struct btrfs_dir_item *di;
378 struct btrfs_key key;
379 struct btrfs_path path;
382 struct btrfs_leaf *leaf;
385 unsigned char d_type = DT_UNKNOWN;
388 key.objectid = inode->i_ino;
390 btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
391 key.offset = filp->f_pos;
392 btrfs_init_path(&path);
393 ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
399 leaf = btrfs_buffer_leaf(path.nodes[0]);
400 nritems = btrfs_header_nritems(&leaf->header);
401 slot = path.slots[0];
402 if (advance || slot >= nritems) {
403 if (slot >= nritems -1) {
404 ret = btrfs_next_leaf(root, &path);
407 leaf = btrfs_buffer_leaf(path.nodes[0]);
408 nritems = btrfs_header_nritems(&leaf->header);
409 slot = path.slots[0];
416 item = leaf->items + slot;
417 if (btrfs_disk_key_objectid(&item->key) != key.objectid)
419 if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_ITEM_KEY)
421 if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
425 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
426 over = filldir(dirent, (const char *)(di + 1),
427 btrfs_dir_name_len(di),
428 btrfs_disk_key_offset(&item->key),
429 btrfs_dir_objectid(di), d_type);
431 filp->f_pos = btrfs_disk_key_offset(&item->key);
434 filp->f_pos = btrfs_disk_key_offset(&item->key) + 1;
438 btrfs_release_path(root, &path);
442 static void btrfs_put_super (struct super_block * sb)
444 struct btrfs_root *root = btrfs_sb(sb);
447 ret = close_ctree(root);
449 printk("close ctree returns %d\n", ret);
451 sb->s_fs_info = NULL;
454 static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
456 struct inode * inode;
457 struct dentry * root_dentry;
458 struct btrfs_super_block *disk_super;
459 struct buffer_head *bh;
460 struct btrfs_root *root;
462 sb->s_maxbytes = MAX_LFS_FILESIZE;
463 sb->s_blocksize = PAGE_CACHE_SIZE;
464 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
465 sb->s_magic = BTRFS_SUPER_MAGIC;
466 sb->s_op = &btrfs_super_ops;
469 bh = sb_bread(sb, BTRFS_SUPER_INFO_OFFSET / sb->s_blocksize);
471 printk("btrfs: unable to read on disk super\n");
474 disk_super = (struct btrfs_super_block *)bh->b_data;
475 root = open_ctree(sb, bh, disk_super);
478 printk("btrfs: open_ctree failed\n");
481 sb->s_fs_info = root;
482 disk_super = root->fs_info->disk_super;
483 printk("read in super total blocks %Lu root %Lu\n",
484 btrfs_super_total_blocks(disk_super),
485 btrfs_super_root_dir(disk_super));
487 inode = iget_locked(sb, btrfs_super_root_dir(disk_super));
490 if (inode->i_state & I_NEW) {
491 btrfs_read_locked_inode(inode);
492 unlock_new_inode(inode);
495 root_dentry = d_alloc_root(inode);
500 sb->s_root = root_dentry;
505 static void fill_inode_item(struct btrfs_inode_item *item,
508 btrfs_set_inode_uid(item, inode->i_uid);
509 btrfs_set_inode_gid(item, inode->i_gid);
510 btrfs_set_inode_size(item, inode->i_size);
511 btrfs_set_inode_mode(item, inode->i_mode);
512 btrfs_set_inode_nlink(item, inode->i_nlink);
513 btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec);
514 btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec);
515 btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec);
516 btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec);
517 btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec);
518 btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
519 btrfs_set_inode_nblocks(item, inode->i_blocks);
520 btrfs_set_inode_generation(item, inode->i_generation);
523 static int btrfs_update_inode(struct btrfs_trans_handle *trans,
524 struct btrfs_root *root,
527 struct btrfs_inode_item *inode_item;
528 struct btrfs_path path;
531 btrfs_init_path(&path);
533 ret = btrfs_lookup_inode(trans, root, &path, inode->i_ino, 1);
540 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
542 struct btrfs_inode_item);
544 fill_inode_item(inode_item, inode);
545 mark_buffer_dirty(path.nodes[0]);
547 btrfs_release_path(root, &path);
551 static int btrfs_write_inode(struct inode *inode, int wait)
553 struct btrfs_root *root = btrfs_sb(inode->i_sb);
554 struct btrfs_trans_handle *trans;
557 mutex_lock(&root->fs_info->fs_mutex);
558 trans = btrfs_start_transaction(root, 1);
559 ret = btrfs_update_inode(trans, root, inode);
561 btrfs_commit_transaction(trans, root);
563 btrfs_end_transaction(trans, root);
564 mutex_unlock(&root->fs_info->fs_mutex);
568 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
569 struct inode *dir, int mode)
572 struct btrfs_inode_item inode_item;
573 struct btrfs_root *root = btrfs_sb(dir->i_sb);
574 struct btrfs_key key;
578 inode = new_inode(dir->i_sb);
580 return ERR_PTR(-ENOMEM);
582 ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
585 inode->i_uid = current->fsuid;
586 inode->i_gid = current->fsgid;
587 inode->i_mode = mode;
588 inode->i_ino = objectid;
590 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
591 fill_inode_item(&inode_item, inode);
593 key.objectid = objectid;
596 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
597 ret = btrfs_insert_inode_map(trans, root, objectid, &key);
600 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
603 insert_inode_hash(inode);
607 static int btrfs_add_link(struct btrfs_trans_handle *trans,
608 struct dentry *dentry, struct inode *inode)
611 ret = btrfs_insert_dir_item(trans, btrfs_sb(inode->i_sb),
612 dentry->d_name.name, dentry->d_name.len,
613 dentry->d_parent->d_inode->i_ino,
616 dentry->d_parent->d_inode->i_size += dentry->d_name.len;
617 ret = btrfs_update_inode(trans, btrfs_sb(inode->i_sb),
618 dentry->d_parent->d_inode);
624 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
625 struct dentry *dentry, struct inode *inode)
627 int err = btrfs_add_link(trans, dentry, inode);
629 d_instantiate(dentry, inode);
635 static int btrfs_create(struct inode *dir, struct dentry *dentry,
636 int mode, struct nameidata *nd)
638 struct btrfs_trans_handle *trans;
639 struct btrfs_root *root = btrfs_sb(dir->i_sb);
644 mutex_lock(&root->fs_info->fs_mutex);
645 trans = btrfs_start_transaction(root, 1);
646 inode = btrfs_new_inode(trans, dir, mode);
647 err = PTR_ERR(inode);
650 // FIXME mark the inode dirty
651 err = btrfs_add_nondir(trans, dentry, inode);
655 inode->i_mapping->a_ops = &btrfs_aops;
656 inode->i_fop = &btrfs_file_operations;
657 inode->i_op = &btrfs_file_inode_operations;
659 dir->i_sb->s_dirt = 1;
660 btrfs_end_transaction(trans, root);
662 mutex_unlock(&root->fs_info->fs_mutex);
664 inode_dec_link_count(inode);
670 static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
671 struct inode *inode, struct inode *dir)
673 struct btrfs_root *root = btrfs_sb(inode->i_sb);
679 ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino,
683 ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino,
688 ret = btrfs_update_inode(trans, root, inode);
693 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
696 struct btrfs_trans_handle *trans;
697 struct btrfs_root *root = btrfs_sb(dir->i_sb);
701 mutex_lock(&root->fs_info->fs_mutex);
702 trans = btrfs_start_transaction(root, 1);
704 err = PTR_ERR(trans);
707 inode = btrfs_new_inode(trans, dir, S_IFDIR | mode);
709 err = PTR_ERR(inode);
713 inode->i_op = &btrfs_dir_inode_operations;
714 inode->i_fop = &btrfs_dir_file_operations;
716 err = btrfs_make_empty_dir(trans, inode, dir);
719 err = btrfs_add_link(trans, dentry, inode);
722 d_instantiate(dentry, inode);
726 btrfs_end_transaction(trans, root);
728 mutex_unlock(&root->fs_info->fs_mutex);
734 static int btrfs_sync_fs(struct super_block *sb, int wait)
736 struct btrfs_trans_handle *trans;
737 struct btrfs_root *root;
743 filemap_flush(root->fs_info->btree_inode->i_mapping);
746 filemap_write_and_wait(root->fs_info->btree_inode->i_mapping);
748 mutex_lock(&root->fs_info->fs_mutex);
749 trans = btrfs_start_transaction(root, 1);
750 ret = btrfs_commit_transaction(trans, root);
753 printk("btrfs sync_fs\n");
754 mutex_unlock(&root->fs_info->fs_mutex);
758 static int btrfs_get_block(struct inode *inode, sector_t iblock,
759 struct buffer_head *result, int create)
764 u64 extent_start = 0;
766 u64 objectid = inode->i_ino;
767 struct btrfs_path path;
768 struct btrfs_root *root = btrfs_sb(inode->i_sb);
769 struct btrfs_trans_handle *trans = NULL;
770 struct btrfs_file_extent_item *item;
771 struct btrfs_leaf *leaf;
772 struct btrfs_disk_key *found_key;
774 btrfs_init_path(&path);
775 mutex_lock(&root->fs_info->fs_mutex);
777 trans = btrfs_start_transaction(root, 1);
780 ret = btrfs_lookup_file_extent(trans, root, &path,
782 iblock << inode->i_blkbits, 0);
784 btrfs_release_path(root, &path);
790 if (path.slots[0] == 0) {
791 btrfs_release_path(root, &path);
797 item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
798 struct btrfs_file_extent_item);
799 leaf = btrfs_buffer_leaf(path.nodes[0]);
800 blocknr = btrfs_file_extent_disk_blocknr(item);
801 blocknr += btrfs_file_extent_offset(item);
803 /* exact match found, use it */
806 map_bh(result, inode->i_sb, blocknr);
807 btrfs_release_path(root, &path);
811 /* are we inside the extent that was found? */
812 found_key = &leaf->items[path.slots[0]].key;
813 if (btrfs_disk_key_objectid(found_key) != objectid ||
814 btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) {
817 btrfs_release_path(root, &path);
821 extent_start = btrfs_disk_key_offset(&leaf->items[path.slots[0]].key);
822 extent_start = extent_start >> inode->i_blkbits;
823 extent_start += btrfs_file_extent_offset(item);
824 extent_end = extent_start + btrfs_file_extent_num_blocks(item);
825 btrfs_release_path(root, &path);
826 if (iblock >= extent_start && iblock < extent_end) {
828 map_bh(result, inode->i_sb, blocknr + iblock - extent_start);
832 /* ok, create a new extent */
837 ret = btrfs_alloc_file_extent(trans, root, objectid,
838 iblock << inode->i_blkbits,
839 1, extent_end, &blocknr);
844 inode->i_blocks += inode->i_sb->s_blocksize >> 9;
845 set_buffer_new(result);
846 map_bh(result, inode->i_sb, blocknr);
850 btrfs_end_transaction(trans, root);
851 mutex_unlock(&root->fs_info->fs_mutex);
855 static int btrfs_prepare_write(struct file *file, struct page *page,
856 unsigned from, unsigned to)
858 return nobh_prepare_write(page, from, to, btrfs_get_block);
861 static void btrfs_write_super(struct super_block *sb)
863 btrfs_sync_fs(sb, 1);
866 static int btrfs_readpage(struct file *file, struct page *page)
868 return mpage_readpage(page, btrfs_get_block);
871 static int btrfs_readpages(struct file *file, struct address_space *mapping,
872 struct list_head *pages, unsigned nr_pages)
874 return mpage_readpages(mapping, pages, nr_pages, btrfs_get_block);
877 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
879 return nobh_writepage(page, btrfs_get_block, wbc);
882 static void btrfs_truncate(struct inode *inode)
884 struct btrfs_root *root = btrfs_sb(inode->i_sb);
886 struct btrfs_trans_handle *trans;
888 if (!S_ISREG(inode->i_mode))
890 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
893 nobh_truncate_page(inode->i_mapping, inode->i_size);
895 /* FIXME, add redo link to tree so we don't leak on crash */
896 mutex_lock(&root->fs_info->fs_mutex);
897 trans = btrfs_start_transaction(root, 1);
898 ret = btrfs_truncate_in_trans(trans, root, inode);
900 ret = btrfs_end_transaction(trans, root);
902 mutex_unlock(&root->fs_info->fs_mutex);
903 mark_inode_dirty(inode);
906 static int btrfs_get_sb(struct file_system_type *fs_type,
907 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
909 return get_sb_bdev(fs_type, flags, dev_name, data,
910 btrfs_fill_super, mnt);
913 static struct file_system_type btrfs_fs_type = {
914 .owner = THIS_MODULE,
916 .get_sb = btrfs_get_sb,
917 .kill_sb = kill_block_super,
918 .fs_flags = FS_REQUIRES_DEV,
921 static struct super_operations btrfs_super_ops = {
922 .statfs = simple_statfs,
923 .delete_inode = btrfs_delete_inode,
924 .put_super = btrfs_put_super,
925 .read_inode = btrfs_read_locked_inode,
926 .write_super = btrfs_write_super,
927 .sync_fs = btrfs_sync_fs,
928 .write_inode = btrfs_write_inode,
931 static struct inode_operations btrfs_dir_inode_operations = {
932 .lookup = btrfs_lookup,
933 .create = btrfs_create,
934 .unlink = btrfs_unlink,
935 .mkdir = btrfs_mkdir,
936 .rmdir = btrfs_rmdir,
939 static struct file_operations btrfs_dir_file_operations = {
940 .llseek = generic_file_llseek,
941 .read = generic_read_dir,
942 .readdir = btrfs_readdir,
945 static struct address_space_operations btrfs_aops = {
946 .readpage = btrfs_readpage,
947 .readpages = btrfs_readpages,
948 .writepage = btrfs_writepage,
949 .sync_page = block_sync_page,
950 .prepare_write = btrfs_prepare_write,
951 .commit_write = nobh_commit_write,
954 static struct inode_operations btrfs_file_inode_operations = {
955 .truncate = btrfs_truncate,
958 static struct file_operations btrfs_file_operations = {
959 .llseek = generic_file_llseek,
960 .read = do_sync_read,
961 .write = do_sync_write,
962 .aio_read = generic_file_aio_read,
963 .aio_write = generic_file_aio_write,
964 .mmap = generic_file_mmap,
965 .open = generic_file_open,
966 .sendfile = generic_file_sendfile,
967 .splice_read = generic_file_splice_read,
968 .splice_write = generic_file_splice_write,
971 static int __init init_btrfs_fs(void)
973 printk("btrfs loaded!\n");
974 return register_filesystem(&btrfs_fs_type);
977 static void __exit exit_btrfs_fs(void)
979 unregister_filesystem(&btrfs_fs_type);
980 printk("btrfs unloaded\n");
983 module_init(init_btrfs_fs)
984 module_exit(exit_btrfs_fs)
986 MODULE_LICENSE("GPL");