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(struct inode *dir, struct dentry *dentry)
86 struct btrfs_path path;
87 struct btrfs_root *root;
88 struct btrfs_trans_handle *trans;
89 const char *name = dentry->d_name.name;
90 int name_len = dentry->d_name.len;
93 struct btrfs_dir_item *di;
95 btrfs_init_path(&path);
96 root = btrfs_sb(dir->i_sb);
97 mutex_lock(&root->fs_info->fs_mutex);
98 trans = btrfs_start_transaction(root, 1);
100 ret = btrfs_lookup_dir_item(trans, root, &path, dir->i_ino,
108 di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
109 struct btrfs_dir_item);
110 objectid = btrfs_dir_objectid(di);
112 ret = btrfs_del_item(trans, root, &path);
114 dentry->d_inode->i_ctime = dir->i_ctime;
116 btrfs_release_path(root, &path);
117 btrfs_end_transaction(trans, root);
118 mutex_unlock(&root->fs_info->fs_mutex);
120 inode_dec_link_count(dentry->d_inode);
124 static int btrfs_free_inode(struct btrfs_trans_handle *trans,
125 struct btrfs_root *root,
128 u64 objectid = inode->i_ino;
129 struct btrfs_path path;
130 struct btrfs_inode_map_item *map;
131 struct btrfs_key stat_data_key;
134 btrfs_init_path(&path);
135 ret = btrfs_lookup_inode_map(trans, root, &path, objectid, -1);
139 btrfs_release_path(root, &path);
142 map = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
143 struct btrfs_inode_map_item);
144 btrfs_disk_key_to_cpu(&stat_data_key, &map->key);
145 ret = btrfs_del_item(trans, root->fs_info->inode_root, &path);
147 btrfs_release_path(root, &path);
148 btrfs_init_path(&path);
150 ret = btrfs_lookup_inode(trans, root, &path, objectid, -1);
152 ret = btrfs_del_item(trans, root, &path);
154 btrfs_release_path(root, &path);
159 static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
160 struct btrfs_root *root,
164 struct btrfs_path path;
165 struct btrfs_key key;
166 struct btrfs_disk_key *found_key;
167 struct btrfs_leaf *leaf;
168 struct btrfs_file_extent_item *fi;
170 u64 extent_num_blocks;
172 /* FIXME, add redo link to tree so we don't leak on crash */
173 key.objectid = inode->i_ino;
174 key.offset = (u64)-1;
176 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
178 btrfs_init_path(&path);
179 ret = btrfs_search_slot(trans, root, &key, &path, -1, 1);
181 btrfs_release_path(root, &path);
185 BUG_ON(path.slots[0] == 0);
188 leaf = btrfs_buffer_leaf(path.nodes[0]);
189 found_key = &leaf->items[path.slots[0]].key;
190 if (btrfs_disk_key_objectid(found_key) != inode->i_ino)
192 if (btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY)
194 if (btrfs_disk_key_offset(found_key) < inode->i_size)
196 /* FIXME: add extent truncation */
197 if (btrfs_disk_key_offset(found_key) < inode->i_size)
199 fi = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
201 struct btrfs_file_extent_item);
202 extent_start = btrfs_file_extent_disk_blocknr(fi);
203 extent_num_blocks = btrfs_file_extent_disk_num_blocks(fi);
204 key.offset = btrfs_disk_key_offset(found_key) - 1;
205 ret = btrfs_del_item(trans, root, &path);
207 inode->i_blocks -= btrfs_file_extent_num_blocks(fi) >> 9;
208 btrfs_release_path(root, &path);
209 ret = btrfs_free_extent(trans, root, extent_start,
210 extent_num_blocks, 0);
212 if (btrfs_disk_key_offset(found_key) == 0)
215 btrfs_release_path(root, &path);
221 static void btrfs_delete_inode(struct inode *inode)
223 struct btrfs_trans_handle *trans;
224 struct btrfs_root *root = btrfs_sb(inode->i_sb);
227 truncate_inode_pages(&inode->i_data, 0);
228 if (is_bad_inode(inode)) {
232 mutex_lock(&root->fs_info->fs_mutex);
233 trans = btrfs_start_transaction(root, 1);
234 if (S_ISREG(inode->i_mode)) {
235 ret = btrfs_truncate_in_trans(trans, root, inode);
238 btrfs_free_inode(trans, root, inode);
239 btrfs_end_transaction(trans, root);
240 mutex_unlock(&root->fs_info->fs_mutex);
246 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
249 const char *name = dentry->d_name.name;
250 int namelen = dentry->d_name.len;
251 struct btrfs_dir_item *di;
252 struct btrfs_path path;
253 struct btrfs_root *root = btrfs_sb(dir->i_sb);
256 btrfs_init_path(&path);
257 ret = btrfs_lookup_dir_item(NULL, root, &path, dir->i_ino, name,
259 if (ret || !btrfs_match_dir_item_name(root, &path, name, namelen)) {
263 di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
264 struct btrfs_dir_item);
265 *ino = btrfs_dir_objectid(di);
267 btrfs_release_path(root, &path);
271 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
272 struct nameidata *nd)
274 struct inode * inode;
278 if (dentry->d_name.len > BTRFS_NAME_LEN)
279 return ERR_PTR(-ENAMETOOLONG);
281 ret = btrfs_inode_by_name(dir, dentry, &ino);
286 inode = iget(dir->i_sb, ino);
288 return ERR_PTR(-EACCES);
290 return d_splice_alias(inode, dentry);
293 static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
295 struct inode *inode = filp->f_path.dentry->d_inode;
296 struct btrfs_root *root = btrfs_sb(inode->i_sb);
297 struct btrfs_item *item;
298 struct btrfs_dir_item *di;
299 struct btrfs_key key;
300 struct btrfs_path path;
303 struct btrfs_leaf *leaf;
306 unsigned char d_type = DT_UNKNOWN;
309 key.objectid = inode->i_ino;
311 btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
312 key.offset = filp->f_pos;
313 btrfs_init_path(&path);
314 ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
320 leaf = btrfs_buffer_leaf(path.nodes[0]);
321 nritems = btrfs_header_nritems(&leaf->header);
322 slot = path.slots[0];
323 if (advance || slot >= nritems) {
324 if (slot >= nritems -1) {
325 ret = btrfs_next_leaf(root, &path);
328 leaf = btrfs_buffer_leaf(path.nodes[0]);
329 nritems = btrfs_header_nritems(&leaf->header);
330 slot = path.slots[0];
337 item = leaf->items + slot;
338 if (btrfs_disk_key_objectid(&item->key) != key.objectid)
340 if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_ITEM_KEY)
342 if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
346 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
347 over = filldir(dirent, (const char *)(di + 1),
348 btrfs_dir_name_len(di),
349 btrfs_disk_key_offset(&item->key),
350 btrfs_dir_objectid(di), d_type);
352 filp->f_pos = btrfs_disk_key_offset(&item->key);
355 filp->f_pos = btrfs_disk_key_offset(&item->key) + 1;
359 btrfs_release_path(root, &path);
363 static void btrfs_put_super (struct super_block * sb)
365 struct btrfs_root *root = btrfs_sb(sb);
368 ret = close_ctree(root);
370 printk("close ctree returns %d\n", ret);
372 sb->s_fs_info = NULL;
375 static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
377 struct inode * inode;
378 struct dentry * root_dentry;
379 struct btrfs_super_block *disk_super;
380 struct buffer_head *bh;
381 struct btrfs_root *root;
383 sb->s_maxbytes = MAX_LFS_FILESIZE;
384 sb->s_blocksize = PAGE_CACHE_SIZE;
385 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
386 sb->s_magic = BTRFS_SUPER_MAGIC;
387 sb->s_op = &btrfs_super_ops;
390 bh = sb_bread(sb, BTRFS_SUPER_INFO_OFFSET / sb->s_blocksize);
392 printk("btrfs: unable to read on disk super\n");
395 disk_super = (struct btrfs_super_block *)bh->b_data;
396 root = open_ctree(sb, bh, disk_super);
397 sb->s_fs_info = root;
399 printk("btrfs: open_ctree failed\n");
402 printk("read in super total blocks %Lu root %Lu\n",
403 btrfs_super_total_blocks(disk_super),
404 btrfs_super_root_dir(disk_super));
406 inode = iget_locked(sb, btrfs_super_root_dir(disk_super));
409 if (inode->i_state & I_NEW) {
410 btrfs_read_locked_inode(inode);
411 unlock_new_inode(inode);
414 root_dentry = d_alloc_root(inode);
419 sb->s_root = root_dentry;
424 static void fill_inode_item(struct btrfs_inode_item *item,
427 btrfs_set_inode_uid(item, inode->i_uid);
428 btrfs_set_inode_gid(item, inode->i_gid);
429 btrfs_set_inode_size(item, inode->i_size);
430 btrfs_set_inode_mode(item, inode->i_mode);
431 btrfs_set_inode_nlink(item, inode->i_nlink);
432 btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec);
433 btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec);
434 btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec);
435 btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec);
436 btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec);
437 btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
438 btrfs_set_inode_nblocks(item, inode->i_blocks);
439 btrfs_set_inode_generation(item, inode->i_generation);
442 static int btrfs_update_inode(struct btrfs_trans_handle *trans,
443 struct btrfs_root *root,
446 struct btrfs_inode_item *inode_item;
447 struct btrfs_path path;
450 btrfs_init_path(&path);
452 ret = btrfs_lookup_inode(trans, root, &path, inode->i_ino, 1);
459 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
461 struct btrfs_inode_item);
463 fill_inode_item(inode_item, inode);
464 mark_buffer_dirty(path.nodes[0]);
466 btrfs_release_path(root, &path);
470 static int btrfs_write_inode(struct inode *inode, int wait)
472 struct btrfs_root *root = btrfs_sb(inode->i_sb);
473 struct btrfs_trans_handle *trans;
476 mutex_lock(&root->fs_info->fs_mutex);
477 trans = btrfs_start_transaction(root, 1);
478 ret = btrfs_update_inode(trans, root, inode);
480 btrfs_commit_transaction(trans, root);
482 btrfs_end_transaction(trans, root);
483 mutex_unlock(&root->fs_info->fs_mutex);
487 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
488 struct inode *dir, int mode)
491 struct btrfs_inode_item inode_item;
492 struct btrfs_root *root = btrfs_sb(dir->i_sb);
493 struct btrfs_key key;
497 inode = new_inode(dir->i_sb);
499 return ERR_PTR(-ENOMEM);
501 ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
504 inode->i_uid = current->fsuid;
505 inode->i_gid = current->fsgid;
506 inode->i_mode = mode;
507 inode->i_ino = objectid;
509 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
510 fill_inode_item(&inode_item, inode);
512 key.objectid = objectid;
515 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
516 ret = btrfs_insert_inode_map(trans, root, objectid, &key);
519 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
522 insert_inode_hash(inode);
526 static int btrfs_add_link(struct btrfs_trans_handle *trans,
527 struct dentry *dentry, struct inode *inode)
530 ret = btrfs_insert_dir_item(trans, btrfs_sb(inode->i_sb),
531 dentry->d_name.name, dentry->d_name.len,
532 dentry->d_parent->d_inode->i_ino,
535 dentry->d_parent->d_inode->i_size += dentry->d_name.len;
536 ret = btrfs_update_inode(trans, btrfs_sb(inode->i_sb),
537 dentry->d_parent->d_inode);
543 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
544 struct dentry *dentry, struct inode *inode)
546 int err = btrfs_add_link(trans, dentry, inode);
548 d_instantiate(dentry, inode);
554 static int btrfs_create(struct inode *dir, struct dentry *dentry,
555 int mode, struct nameidata *nd)
557 struct btrfs_trans_handle *trans;
558 struct btrfs_root *root = btrfs_sb(dir->i_sb);
563 mutex_lock(&root->fs_info->fs_mutex);
564 trans = btrfs_start_transaction(root, 1);
565 inode = btrfs_new_inode(trans, dir, mode);
566 err = PTR_ERR(inode);
569 // FIXME mark the inode dirty
570 err = btrfs_add_nondir(trans, dentry, inode);
574 inode->i_mapping->a_ops = &btrfs_aops;
575 inode->i_fop = &btrfs_file_operations;
576 inode->i_op = &btrfs_file_inode_operations;
578 dir->i_sb->s_dirt = 1;
579 btrfs_end_transaction(trans, root);
581 mutex_unlock(&root->fs_info->fs_mutex);
583 inode_dec_link_count(inode);
589 static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
590 struct inode *inode, struct inode *dir)
592 struct btrfs_root *root = btrfs_sb(inode->i_sb);
598 ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino,
602 ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino,
607 ret = btrfs_update_inode(trans, root, inode);
612 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
615 struct btrfs_trans_handle *trans;
616 struct btrfs_root *root = btrfs_sb(dir->i_sb);
620 mutex_lock(&root->fs_info->fs_mutex);
621 trans = btrfs_start_transaction(root, 1);
623 err = PTR_ERR(trans);
626 inode = btrfs_new_inode(trans, dir, S_IFDIR | mode);
628 err = PTR_ERR(inode);
632 inode->i_op = &btrfs_dir_inode_operations;
633 inode->i_fop = &btrfs_dir_file_operations;
635 err = btrfs_make_empty_dir(trans, inode, dir);
638 err = btrfs_add_link(trans, dentry, inode);
641 d_instantiate(dentry, inode);
645 btrfs_end_transaction(trans, root);
647 mutex_unlock(&root->fs_info->fs_mutex);
653 static int btrfs_sync_fs(struct super_block *sb, int wait)
655 struct btrfs_trans_handle *trans;
656 struct btrfs_root *root;
661 filemap_flush(sb->s_bdev->bd_inode->i_mapping);
664 filemap_write_and_wait(sb->s_bdev->bd_inode->i_mapping);
667 mutex_lock(&root->fs_info->fs_mutex);
668 trans = btrfs_start_transaction(root, 1);
669 ret = btrfs_commit_transaction(trans, root);
672 printk("btrfs sync_fs\n");
673 mutex_unlock(&root->fs_info->fs_mutex);
677 static int btrfs_get_block(struct inode *inode, sector_t iblock,
678 struct buffer_head *result, int create)
683 u64 extent_start = 0;
685 u64 objectid = inode->i_ino;
686 struct btrfs_path path;
687 struct btrfs_root *root = btrfs_sb(inode->i_sb);
688 struct btrfs_trans_handle *trans = NULL;
689 struct btrfs_file_extent_item *item;
690 struct btrfs_leaf *leaf;
691 struct btrfs_disk_key *found_key;
693 btrfs_init_path(&path);
694 mutex_lock(&root->fs_info->fs_mutex);
696 trans = btrfs_start_transaction(root, 1);
699 ret = btrfs_lookup_file_extent(trans, root, &path,
701 iblock << inode->i_blkbits, 0);
703 btrfs_release_path(root, &path);
709 if (path.slots[0] == 0) {
710 btrfs_release_path(root, &path);
716 item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
717 struct btrfs_file_extent_item);
718 leaf = btrfs_buffer_leaf(path.nodes[0]);
719 blocknr = btrfs_file_extent_disk_blocknr(item);
720 blocknr += btrfs_file_extent_offset(item);
722 /* exact match found, use it */
725 map_bh(result, inode->i_sb, blocknr);
726 btrfs_release_path(root, &path);
730 /* are we inside the extent that was found? */
731 found_key = &leaf->items[path.slots[0]].key;
732 if (btrfs_disk_key_objectid(found_key) != objectid ||
733 btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) {
736 btrfs_release_path(root, &path);
740 extent_start = btrfs_disk_key_offset(&leaf->items[path.slots[0]].key);
741 extent_start = extent_start >> inode->i_blkbits;
742 extent_start += btrfs_file_extent_offset(item);
743 extent_end = extent_start + btrfs_file_extent_num_blocks(item);
744 btrfs_release_path(root, &path);
745 if (iblock >= extent_start && iblock < extent_end) {
747 map_bh(result, inode->i_sb, blocknr + iblock - extent_start);
751 /* ok, create a new extent */
756 ret = btrfs_alloc_file_extent(trans, root, objectid,
757 iblock << inode->i_blkbits,
758 1, extent_end, &blocknr);
763 inode->i_blocks += inode->i_sb->s_blocksize >> 9;
764 set_buffer_new(result);
765 map_bh(result, inode->i_sb, blocknr);
769 btrfs_end_transaction(trans, root);
770 mutex_unlock(&root->fs_info->fs_mutex);
774 static int btrfs_prepare_write(struct file *file, struct page *page,
775 unsigned from, unsigned to)
777 return nobh_prepare_write(page, from, to, btrfs_get_block);
780 static void btrfs_write_super(struct super_block *sb)
782 btrfs_sync_fs(sb, 1);
785 static int btrfs_readpage(struct file *file, struct page *page)
787 return mpage_readpage(page, btrfs_get_block);
790 static int btrfs_readpages(struct file *file, struct address_space *mapping,
791 struct list_head *pages, unsigned nr_pages)
793 return mpage_readpages(mapping, pages, nr_pages, btrfs_get_block);
796 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
798 return nobh_writepage(page, btrfs_get_block, wbc);
801 static void btrfs_truncate(struct inode *inode)
803 struct btrfs_root *root = btrfs_sb(inode->i_sb);
805 struct btrfs_trans_handle *trans;
807 if (!S_ISREG(inode->i_mode))
809 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
812 nobh_truncate_page(inode->i_mapping, inode->i_size);
814 /* FIXME, add redo link to tree so we don't leak on crash */
815 mutex_lock(&root->fs_info->fs_mutex);
816 trans = btrfs_start_transaction(root, 1);
817 ret = btrfs_truncate_in_trans(trans, root, inode);
819 ret = btrfs_end_transaction(trans, root);
821 mutex_unlock(&root->fs_info->fs_mutex);
822 mark_inode_dirty(inode);
825 static int btrfs_get_sb(struct file_system_type *fs_type,
826 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
828 return get_sb_bdev(fs_type, flags, dev_name, data,
829 btrfs_fill_super, mnt);
832 static struct file_system_type btrfs_fs_type = {
833 .owner = THIS_MODULE,
835 .get_sb = btrfs_get_sb,
836 .kill_sb = kill_block_super,
837 .fs_flags = FS_REQUIRES_DEV,
840 static struct super_operations btrfs_super_ops = {
841 .statfs = simple_statfs,
842 .delete_inode = btrfs_delete_inode,
843 .put_super = btrfs_put_super,
844 .read_inode = btrfs_read_locked_inode,
845 .write_super = btrfs_write_super,
846 .sync_fs = btrfs_sync_fs,
847 .write_inode = btrfs_write_inode,
850 static struct inode_operations btrfs_dir_inode_operations = {
851 .lookup = btrfs_lookup,
852 .create = btrfs_create,
853 .unlink = btrfs_unlink,
854 .mkdir = btrfs_mkdir,
857 static struct file_operations btrfs_dir_file_operations = {
858 .llseek = generic_file_llseek,
859 .read = generic_read_dir,
860 .readdir = btrfs_readdir,
863 static struct address_space_operations btrfs_aops = {
864 .readpage = btrfs_readpage,
865 .readpages = btrfs_readpages,
866 .writepage = btrfs_writepage,
867 .sync_page = block_sync_page,
868 .prepare_write = btrfs_prepare_write,
869 .commit_write = nobh_commit_write,
872 static struct inode_operations btrfs_file_inode_operations = {
873 .truncate = btrfs_truncate,
876 static struct file_operations btrfs_file_operations = {
877 .llseek = generic_file_llseek,
878 .read = do_sync_read,
879 .write = do_sync_write,
880 .aio_read = generic_file_aio_read,
881 .aio_write = generic_file_aio_write,
882 .mmap = generic_file_mmap,
883 .open = generic_file_open,
884 .sendfile = generic_file_sendfile,
885 .splice_read = generic_file_splice_read,
886 .splice_write = generic_file_splice_write,
889 static int __init init_btrfs_fs(void)
891 printk("btrfs loaded!\n");
892 return register_filesystem(&btrfs_fs_type);
895 static void __exit exit_btrfs_fs(void)
897 unregister_filesystem(&btrfs_fs_type);
898 printk("btrfs unloaded\n");
901 module_init(init_btrfs_fs)
902 module_exit(exit_btrfs_fs)
904 MODULE_LICENSE("GPL");