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);
476 sb->s_fs_info = root;
478 printk("btrfs: open_ctree failed\n");
481 printk("read in super total blocks %Lu root %Lu\n",
482 btrfs_super_total_blocks(disk_super),
483 btrfs_super_root_dir(disk_super));
485 inode = iget_locked(sb, btrfs_super_root_dir(disk_super));
488 if (inode->i_state & I_NEW) {
489 btrfs_read_locked_inode(inode);
490 unlock_new_inode(inode);
493 root_dentry = d_alloc_root(inode);
498 sb->s_root = root_dentry;
503 static void fill_inode_item(struct btrfs_inode_item *item,
506 btrfs_set_inode_uid(item, inode->i_uid);
507 btrfs_set_inode_gid(item, inode->i_gid);
508 btrfs_set_inode_size(item, inode->i_size);
509 btrfs_set_inode_mode(item, inode->i_mode);
510 btrfs_set_inode_nlink(item, inode->i_nlink);
511 btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec);
512 btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec);
513 btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec);
514 btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec);
515 btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec);
516 btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
517 btrfs_set_inode_nblocks(item, inode->i_blocks);
518 btrfs_set_inode_generation(item, inode->i_generation);
521 static int btrfs_update_inode(struct btrfs_trans_handle *trans,
522 struct btrfs_root *root,
525 struct btrfs_inode_item *inode_item;
526 struct btrfs_path path;
529 btrfs_init_path(&path);
531 ret = btrfs_lookup_inode(trans, root, &path, inode->i_ino, 1);
538 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
540 struct btrfs_inode_item);
542 fill_inode_item(inode_item, inode);
543 mark_buffer_dirty(path.nodes[0]);
545 btrfs_release_path(root, &path);
549 static int btrfs_write_inode(struct inode *inode, int wait)
551 struct btrfs_root *root = btrfs_sb(inode->i_sb);
552 struct btrfs_trans_handle *trans;
555 mutex_lock(&root->fs_info->fs_mutex);
556 trans = btrfs_start_transaction(root, 1);
557 ret = btrfs_update_inode(trans, root, inode);
559 btrfs_commit_transaction(trans, root);
561 btrfs_end_transaction(trans, root);
562 mutex_unlock(&root->fs_info->fs_mutex);
566 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
567 struct inode *dir, int mode)
570 struct btrfs_inode_item inode_item;
571 struct btrfs_root *root = btrfs_sb(dir->i_sb);
572 struct btrfs_key key;
576 inode = new_inode(dir->i_sb);
578 return ERR_PTR(-ENOMEM);
580 ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
583 inode->i_uid = current->fsuid;
584 inode->i_gid = current->fsgid;
585 inode->i_mode = mode;
586 inode->i_ino = objectid;
588 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
589 fill_inode_item(&inode_item, inode);
591 key.objectid = objectid;
594 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
595 ret = btrfs_insert_inode_map(trans, root, objectid, &key);
598 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
601 insert_inode_hash(inode);
605 static int btrfs_add_link(struct btrfs_trans_handle *trans,
606 struct dentry *dentry, struct inode *inode)
609 ret = btrfs_insert_dir_item(trans, btrfs_sb(inode->i_sb),
610 dentry->d_name.name, dentry->d_name.len,
611 dentry->d_parent->d_inode->i_ino,
614 dentry->d_parent->d_inode->i_size += dentry->d_name.len;
615 ret = btrfs_update_inode(trans, btrfs_sb(inode->i_sb),
616 dentry->d_parent->d_inode);
622 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
623 struct dentry *dentry, struct inode *inode)
625 int err = btrfs_add_link(trans, dentry, inode);
627 d_instantiate(dentry, inode);
633 static int btrfs_create(struct inode *dir, struct dentry *dentry,
634 int mode, struct nameidata *nd)
636 struct btrfs_trans_handle *trans;
637 struct btrfs_root *root = btrfs_sb(dir->i_sb);
642 mutex_lock(&root->fs_info->fs_mutex);
643 trans = btrfs_start_transaction(root, 1);
644 inode = btrfs_new_inode(trans, dir, mode);
645 err = PTR_ERR(inode);
648 // FIXME mark the inode dirty
649 err = btrfs_add_nondir(trans, dentry, inode);
653 inode->i_mapping->a_ops = &btrfs_aops;
654 inode->i_fop = &btrfs_file_operations;
655 inode->i_op = &btrfs_file_inode_operations;
657 dir->i_sb->s_dirt = 1;
658 btrfs_end_transaction(trans, root);
660 mutex_unlock(&root->fs_info->fs_mutex);
662 inode_dec_link_count(inode);
668 static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
669 struct inode *inode, struct inode *dir)
671 struct btrfs_root *root = btrfs_sb(inode->i_sb);
677 ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino,
681 ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino,
686 ret = btrfs_update_inode(trans, root, inode);
691 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
694 struct btrfs_trans_handle *trans;
695 struct btrfs_root *root = btrfs_sb(dir->i_sb);
699 mutex_lock(&root->fs_info->fs_mutex);
700 trans = btrfs_start_transaction(root, 1);
702 err = PTR_ERR(trans);
705 inode = btrfs_new_inode(trans, dir, S_IFDIR | mode);
707 err = PTR_ERR(inode);
711 inode->i_op = &btrfs_dir_inode_operations;
712 inode->i_fop = &btrfs_dir_file_operations;
714 err = btrfs_make_empty_dir(trans, inode, dir);
717 err = btrfs_add_link(trans, dentry, inode);
720 d_instantiate(dentry, inode);
724 btrfs_end_transaction(trans, root);
726 mutex_unlock(&root->fs_info->fs_mutex);
732 static int btrfs_sync_fs(struct super_block *sb, int wait)
734 struct btrfs_trans_handle *trans;
735 struct btrfs_root *root;
740 filemap_flush(sb->s_bdev->bd_inode->i_mapping);
743 filemap_write_and_wait(sb->s_bdev->bd_inode->i_mapping);
746 mutex_lock(&root->fs_info->fs_mutex);
747 trans = btrfs_start_transaction(root, 1);
748 ret = btrfs_commit_transaction(trans, root);
751 printk("btrfs sync_fs\n");
752 mutex_unlock(&root->fs_info->fs_mutex);
756 static int btrfs_get_block(struct inode *inode, sector_t iblock,
757 struct buffer_head *result, int create)
762 u64 extent_start = 0;
764 u64 objectid = inode->i_ino;
765 struct btrfs_path path;
766 struct btrfs_root *root = btrfs_sb(inode->i_sb);
767 struct btrfs_trans_handle *trans = NULL;
768 struct btrfs_file_extent_item *item;
769 struct btrfs_leaf *leaf;
770 struct btrfs_disk_key *found_key;
772 btrfs_init_path(&path);
773 mutex_lock(&root->fs_info->fs_mutex);
775 trans = btrfs_start_transaction(root, 1);
778 ret = btrfs_lookup_file_extent(trans, root, &path,
780 iblock << inode->i_blkbits, 0);
782 btrfs_release_path(root, &path);
788 if (path.slots[0] == 0) {
789 btrfs_release_path(root, &path);
795 item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
796 struct btrfs_file_extent_item);
797 leaf = btrfs_buffer_leaf(path.nodes[0]);
798 blocknr = btrfs_file_extent_disk_blocknr(item);
799 blocknr += btrfs_file_extent_offset(item);
801 /* exact match found, use it */
804 map_bh(result, inode->i_sb, blocknr);
805 btrfs_release_path(root, &path);
809 /* are we inside the extent that was found? */
810 found_key = &leaf->items[path.slots[0]].key;
811 if (btrfs_disk_key_objectid(found_key) != objectid ||
812 btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) {
815 btrfs_release_path(root, &path);
819 extent_start = btrfs_disk_key_offset(&leaf->items[path.slots[0]].key);
820 extent_start = extent_start >> inode->i_blkbits;
821 extent_start += btrfs_file_extent_offset(item);
822 extent_end = extent_start + btrfs_file_extent_num_blocks(item);
823 btrfs_release_path(root, &path);
824 if (iblock >= extent_start && iblock < extent_end) {
826 map_bh(result, inode->i_sb, blocknr + iblock - extent_start);
830 /* ok, create a new extent */
835 ret = btrfs_alloc_file_extent(trans, root, objectid,
836 iblock << inode->i_blkbits,
837 1, extent_end, &blocknr);
842 inode->i_blocks += inode->i_sb->s_blocksize >> 9;
843 set_buffer_new(result);
844 map_bh(result, inode->i_sb, blocknr);
848 btrfs_end_transaction(trans, root);
849 mutex_unlock(&root->fs_info->fs_mutex);
853 static int btrfs_prepare_write(struct file *file, struct page *page,
854 unsigned from, unsigned to)
856 return nobh_prepare_write(page, from, to, btrfs_get_block);
859 static void btrfs_write_super(struct super_block *sb)
861 btrfs_sync_fs(sb, 1);
864 static int btrfs_readpage(struct file *file, struct page *page)
866 return mpage_readpage(page, btrfs_get_block);
869 static int btrfs_readpages(struct file *file, struct address_space *mapping,
870 struct list_head *pages, unsigned nr_pages)
872 return mpage_readpages(mapping, pages, nr_pages, btrfs_get_block);
875 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
877 return nobh_writepage(page, btrfs_get_block, wbc);
880 static void btrfs_truncate(struct inode *inode)
882 struct btrfs_root *root = btrfs_sb(inode->i_sb);
884 struct btrfs_trans_handle *trans;
886 if (!S_ISREG(inode->i_mode))
888 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
891 nobh_truncate_page(inode->i_mapping, inode->i_size);
893 /* FIXME, add redo link to tree so we don't leak on crash */
894 mutex_lock(&root->fs_info->fs_mutex);
895 trans = btrfs_start_transaction(root, 1);
896 ret = btrfs_truncate_in_trans(trans, root, inode);
898 ret = btrfs_end_transaction(trans, root);
900 mutex_unlock(&root->fs_info->fs_mutex);
901 mark_inode_dirty(inode);
904 static int btrfs_get_sb(struct file_system_type *fs_type,
905 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
907 return get_sb_bdev(fs_type, flags, dev_name, data,
908 btrfs_fill_super, mnt);
911 static struct file_system_type btrfs_fs_type = {
912 .owner = THIS_MODULE,
914 .get_sb = btrfs_get_sb,
915 .kill_sb = kill_block_super,
916 .fs_flags = FS_REQUIRES_DEV,
919 static struct super_operations btrfs_super_ops = {
920 .statfs = simple_statfs,
921 .delete_inode = btrfs_delete_inode,
922 .put_super = btrfs_put_super,
923 .read_inode = btrfs_read_locked_inode,
924 .write_super = btrfs_write_super,
925 .sync_fs = btrfs_sync_fs,
926 .write_inode = btrfs_write_inode,
929 static struct inode_operations btrfs_dir_inode_operations = {
930 .lookup = btrfs_lookup,
931 .create = btrfs_create,
932 .unlink = btrfs_unlink,
933 .mkdir = btrfs_mkdir,
934 .rmdir = btrfs_rmdir,
937 static struct file_operations btrfs_dir_file_operations = {
938 .llseek = generic_file_llseek,
939 .read = generic_read_dir,
940 .readdir = btrfs_readdir,
943 static struct address_space_operations btrfs_aops = {
944 .readpage = btrfs_readpage,
945 .readpages = btrfs_readpages,
946 .writepage = btrfs_writepage,
947 .sync_page = block_sync_page,
948 .prepare_write = btrfs_prepare_write,
949 .commit_write = nobh_commit_write,
952 static struct inode_operations btrfs_file_inode_operations = {
953 .truncate = btrfs_truncate,
956 static struct file_operations btrfs_file_operations = {
957 .llseek = generic_file_llseek,
958 .read = do_sync_read,
959 .write = do_sync_write,
960 .aio_read = generic_file_aio_read,
961 .aio_write = generic_file_aio_write,
962 .mmap = generic_file_mmap,
963 .open = generic_file_open,
964 .sendfile = generic_file_sendfile,
965 .splice_read = generic_file_splice_read,
966 .splice_write = generic_file_splice_write,
969 static int __init init_btrfs_fs(void)
971 printk("btrfs loaded!\n");
972 return register_filesystem(&btrfs_fs_type);
975 static void __exit exit_btrfs_fs(void)
977 unregister_filesystem(&btrfs_fs_type);
978 printk("btrfs unloaded\n");
981 module_init(init_btrfs_fs)
982 module_exit(exit_btrfs_fs)
984 MODULE_LICENSE("GPL");