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>
13 #include "transaction.h"
15 #define BTRFS_SUPER_MAGIC 0x9123682E
17 static struct inode_operations btrfs_dir_inode_operations;
18 static struct super_operations btrfs_super_ops;
19 static struct file_operations btrfs_dir_file_operations;
21 static void btrfs_read_locked_inode(struct inode *inode)
23 struct btrfs_path path;
24 struct btrfs_inode_item *inode_item;
25 struct btrfs_root *root = btrfs_sb(inode->i_sb);
27 btrfs_init_path(&path);
28 ret = btrfs_lookup_inode(NULL, root, &path, inode->i_ino, 0);
30 make_bad_inode(inode);
31 btrfs_release_path(root, &path);
34 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
36 struct btrfs_inode_item);
38 inode->i_mode = btrfs_inode_mode(inode_item);
39 inode->i_nlink = btrfs_inode_nlink(inode_item);
40 inode->i_uid = btrfs_inode_uid(inode_item);
41 inode->i_gid = btrfs_inode_gid(inode_item);
42 inode->i_size = btrfs_inode_size(inode_item);
43 inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime);
44 inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime);
45 inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime);
46 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime);
47 inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime);
48 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);
49 inode->i_blocks = btrfs_inode_nblocks(inode_item);
50 inode->i_generation = btrfs_inode_generation(inode_item);
51 btrfs_release_path(root, &path);
52 switch (inode->i_mode & S_IFMT) {
55 init_special_inode(inode, inode->i_mode,
56 btrfs_inode_rdev(inode_item));
62 inode->i_op = &btrfs_dir_inode_operations;
63 inode->i_fop = &btrfs_dir_file_operations;
66 // inode->i_op = &page_symlink_inode_operations;
72 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
74 struct btrfs_path path;
75 struct btrfs_root *root;
76 struct btrfs_trans_handle *trans;
77 const char *name = dentry->d_name.name;
78 int name_len = dentry->d_name.len;
81 struct btrfs_dir_item *di;
83 btrfs_init_path(&path);
84 root = btrfs_sb(dir->i_sb);
85 mutex_lock(&root->fs_info->fs_mutex);
86 trans = btrfs_start_transaction(root, 1);
88 ret = btrfs_lookup_dir_item(trans, root, &path, dir->i_ino,
96 di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
97 struct btrfs_dir_item);
98 objectid = btrfs_dir_objectid(di);
100 ret = btrfs_del_item(trans, root, &path);
102 dentry->d_inode->i_ctime = dir->i_ctime;
104 btrfs_release_path(root, &path);
105 btrfs_end_transaction(trans, root);
106 mutex_unlock(&root->fs_info->fs_mutex);
108 inode_dec_link_count(dentry->d_inode);
112 static int btrfs_free_inode(struct btrfs_trans_handle *trans,
113 struct btrfs_root *root,
116 u64 objectid = inode->i_ino;
117 struct btrfs_path path;
118 struct btrfs_inode_map_item *map;
119 struct btrfs_key stat_data_key;
122 btrfs_init_path(&path);
123 ret = btrfs_lookup_inode_map(trans, root, &path, objectid, -1);
127 btrfs_release_path(root, &path);
130 map = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
131 struct btrfs_inode_map_item);
132 btrfs_disk_key_to_cpu(&stat_data_key, &map->key);
133 ret = btrfs_del_item(trans, root->fs_info->inode_root, &path);
135 btrfs_release_path(root, &path);
136 btrfs_init_path(&path);
138 ret = btrfs_lookup_inode(trans, root, &path, objectid, -1);
140 ret = btrfs_del_item(trans, root, &path);
142 btrfs_release_path(root, &path);
147 static void btrfs_delete_inode(struct inode *inode)
149 struct btrfs_trans_handle *trans;
150 struct btrfs_root *root = btrfs_sb(inode->i_sb);
151 truncate_inode_pages(&inode->i_data, 0);
152 if (is_bad_inode(inode)) {
159 mutex_lock(&root->fs_info->fs_mutex);
160 trans = btrfs_start_transaction(root, 1);
161 btrfs_free_inode(trans, root, inode);
162 btrfs_end_transaction(trans, root);
163 mutex_unlock(&root->fs_info->fs_mutex);
170 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
173 const char *name = dentry->d_name.name;
174 int namelen = dentry->d_name.len;
175 struct btrfs_dir_item *di;
176 struct btrfs_path path;
177 struct btrfs_root *root = btrfs_sb(dir->i_sb);
180 btrfs_init_path(&path);
181 ret = btrfs_lookup_dir_item(NULL, root, &path, dir->i_ino, name,
183 if (ret || !btrfs_match_dir_item_name(root, &path, name, namelen)) {
187 di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
188 struct btrfs_dir_item);
189 *ino = btrfs_dir_objectid(di);
191 btrfs_release_path(root, &path);
195 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
196 struct nameidata *nd)
198 struct inode * inode;
202 if (dentry->d_name.len > BTRFS_NAME_LEN)
203 return ERR_PTR(-ENAMETOOLONG);
205 ret = btrfs_inode_by_name(dir, dentry, &ino);
210 inode = iget(dir->i_sb, ino);
212 return ERR_PTR(-EACCES);
214 return d_splice_alias(inode, dentry);
217 static void reada_leaves(struct btrfs_root *root, struct btrfs_path *path)
219 struct buffer_head *bh;
220 struct btrfs_node *node;
230 node = btrfs_buffer_node(path->nodes[1]);
231 slot = path->slots[1];
232 objectid = btrfs_disk_key_objectid(&node->ptrs[slot].key);
233 nritems = btrfs_header_nritems(&node->header);
234 for (i = slot; i < nritems; i++) {
235 item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key);
236 if (item_objectid != objectid)
238 blocknr = btrfs_node_blockptr(node, i);
239 bh = sb_getblk(root->fs_info->sb, blocknr);
240 ll_rw_block(READ, 1, &bh);
246 static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
248 struct inode *inode = filp->f_path.dentry->d_inode;
249 struct btrfs_root *root = btrfs_sb(inode->i_sb);
250 struct btrfs_item *item;
251 struct btrfs_dir_item *di;
252 struct btrfs_key key;
253 struct btrfs_path path;
256 struct btrfs_leaf *leaf;
259 unsigned char d_type = DT_UNKNOWN;
262 key.objectid = inode->i_ino;
264 btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
265 key.offset = filp->f_pos;
266 btrfs_init_path(&path);
267 ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
272 reada_leaves(root, &path);
274 leaf = btrfs_buffer_leaf(path.nodes[0]);
275 nritems = btrfs_header_nritems(&leaf->header);
276 slot = path.slots[0];
278 if (slot == nritems -1) {
279 ret = btrfs_next_leaf(root, &path);
282 leaf = btrfs_buffer_leaf(path.nodes[0]);
283 nritems = btrfs_header_nritems(&leaf->header);
284 slot = path.slots[0];
285 if (path.nodes[1] && path.slots[1] == 0)
286 reada_leaves(root, &path);
293 item = leaf->items + slot;
294 if (btrfs_disk_key_objectid(&item->key) != key.objectid)
296 if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_ITEM_KEY)
298 if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
300 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
301 over = filldir(dirent, (const char *)(di + 1),
302 btrfs_dir_name_len(di),
303 btrfs_disk_key_offset(&item->key),
304 btrfs_dir_objectid(di), d_type);
306 filp->f_pos = btrfs_disk_key_offset(&item->key);
309 filp->f_pos = btrfs_disk_key_offset(&item->key) + 1;
313 btrfs_release_path(root, &path);
317 static void btrfs_put_super (struct super_block * sb)
319 struct btrfs_root *root = btrfs_sb(sb);
322 ret = close_ctree(root);
324 printk("close ctree returns %d\n", ret);
326 sb->s_fs_info = NULL;
329 static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
331 struct inode * inode;
332 struct dentry * root_dentry;
333 struct btrfs_super_block *disk_super;
334 struct buffer_head *bh;
335 struct btrfs_root *root;
337 sb->s_maxbytes = MAX_LFS_FILESIZE;
338 sb->s_blocksize = PAGE_CACHE_SIZE;
339 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
340 sb->s_magic = BTRFS_SUPER_MAGIC;
341 sb->s_op = &btrfs_super_ops;
344 bh = sb_bread(sb, BTRFS_SUPER_INFO_OFFSET / sb->s_blocksize);
346 printk("btrfs: unable to read on disk super\n");
349 disk_super = (struct btrfs_super_block *)bh->b_data;
350 root = open_ctree(sb, bh, disk_super);
351 sb->s_fs_info = root;
353 printk("btrfs: open_ctree failed\n");
356 printk("read in super total blocks %Lu root %Lu\n",
357 btrfs_super_total_blocks(disk_super),
358 btrfs_super_root_dir(disk_super));
360 inode = iget_locked(sb, btrfs_super_root_dir(disk_super));
363 if (inode->i_state & I_NEW) {
364 btrfs_read_locked_inode(inode);
365 unlock_new_inode(inode);
368 root_dentry = d_alloc_root(inode);
373 sb->s_root = root_dentry;
378 static void fill_inode_item(struct btrfs_inode_item *item,
381 btrfs_set_inode_uid(item, inode->i_uid);
382 btrfs_set_inode_gid(item, inode->i_gid);
383 btrfs_set_inode_size(item, inode->i_size);
384 btrfs_set_inode_mode(item, inode->i_mode);
385 btrfs_set_inode_nlink(item, inode->i_nlink);
386 btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec);
387 btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec);
388 btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec);
389 btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec);
390 btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec);
391 btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
392 btrfs_set_inode_nblocks(item, inode->i_blocks);
393 btrfs_set_inode_generation(item, inode->i_generation);
396 static int btrfs_update_inode(struct btrfs_trans_handle *trans,
397 struct btrfs_root *root,
400 struct btrfs_inode_item *inode_item;
401 struct btrfs_path path;
404 btrfs_init_path(&path);
406 ret = btrfs_lookup_inode(trans, root, &path, inode->i_ino, 1);
413 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
415 struct btrfs_inode_item);
417 fill_inode_item(inode_item, inode);
418 mark_buffer_dirty(path.nodes[0]);
420 btrfs_release_path(root, &path);
424 static int btrfs_write_inode(struct inode *inode, int wait)
426 struct btrfs_root *root = btrfs_sb(inode->i_sb);
427 struct btrfs_trans_handle *trans;
430 mutex_lock(&root->fs_info->fs_mutex);
431 trans = btrfs_start_transaction(root, 1);
432 ret = btrfs_update_inode(trans, root, inode);
434 btrfs_commit_transaction(trans, root);
436 btrfs_end_transaction(trans, root);
437 mutex_unlock(&root->fs_info->fs_mutex);
441 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
442 struct inode *dir, int mode)
445 struct btrfs_inode_item inode_item;
446 struct btrfs_root *root = btrfs_sb(dir->i_sb);
447 struct btrfs_key key;
451 inode = new_inode(dir->i_sb);
453 return ERR_PTR(-ENOMEM);
455 ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
458 inode->i_uid = current->fsuid;
459 inode->i_gid = current->fsgid;
460 inode->i_mode = mode;
461 inode->i_ino = objectid;
463 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
464 fill_inode_item(&inode_item, inode);
466 key.objectid = objectid;
469 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
470 ret = btrfs_insert_inode_map(trans, root, objectid, &key);
473 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
476 insert_inode_hash(inode);
480 static int btrfs_add_link(struct btrfs_trans_handle *trans,
481 struct dentry *dentry, struct inode *inode)
484 ret = btrfs_insert_dir_item(trans, btrfs_sb(inode->i_sb),
485 dentry->d_name.name, dentry->d_name.len,
486 dentry->d_parent->d_inode->i_ino,
489 dentry->d_parent->d_inode->i_size += dentry->d_name.len;
490 ret = btrfs_update_inode(trans, btrfs_sb(inode->i_sb),
491 dentry->d_parent->d_inode);
497 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
498 struct dentry *dentry, struct inode *inode)
500 int err = btrfs_add_link(trans, dentry, inode);
502 d_instantiate(dentry, inode);
508 static int btrfs_create(struct inode *dir, struct dentry *dentry,
509 int mode, struct nameidata *nd)
511 struct btrfs_trans_handle *trans;
512 struct btrfs_root *root = btrfs_sb(dir->i_sb);
517 mutex_lock(&root->fs_info->fs_mutex);
518 trans = btrfs_start_transaction(root, 1);
519 inode = btrfs_new_inode(trans, dir, mode);
520 err = PTR_ERR(inode);
523 // FIXME mark the inode dirty
524 err = btrfs_add_nondir(trans, dentry, inode);
527 dir->i_sb->s_dirt = 1;
528 btrfs_end_transaction(trans, root);
530 mutex_unlock(&root->fs_info->fs_mutex);
532 inode_dec_link_count(inode);
538 static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
539 struct inode *inode, struct inode *dir)
541 struct btrfs_root *root = btrfs_sb(inode->i_sb);
547 ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino,
551 ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino,
556 ret = btrfs_update_inode(trans, root, inode);
561 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
564 struct btrfs_trans_handle *trans;
565 struct btrfs_root *root = btrfs_sb(dir->i_sb);
569 mutex_lock(&root->fs_info->fs_mutex);
570 trans = btrfs_start_transaction(root, 1);
572 err = PTR_ERR(trans);
575 inode = btrfs_new_inode(trans, dir, S_IFDIR | mode);
577 err = PTR_ERR(inode);
581 inode->i_op = &btrfs_dir_inode_operations;
582 inode->i_fop = &btrfs_dir_file_operations;
584 err = btrfs_make_empty_dir(trans, inode, dir);
587 err = btrfs_add_link(trans, dentry, inode);
590 d_instantiate(dentry, inode);
594 btrfs_end_transaction(trans, root);
596 mutex_unlock(&root->fs_info->fs_mutex);
602 static int btrfs_sync_fs(struct super_block *sb, int wait)
604 struct btrfs_trans_handle *trans;
605 struct btrfs_root *root;
610 filemap_flush(sb->s_bdev->bd_inode->i_mapping);
613 filemap_write_and_wait(sb->s_bdev->bd_inode->i_mapping);
616 mutex_lock(&root->fs_info->fs_mutex);
617 trans = btrfs_start_transaction(root, 1);
618 ret = btrfs_commit_transaction(trans, root);
621 printk("btrfs sync_fs\n");
622 mutex_unlock(&root->fs_info->fs_mutex);
626 static void btrfs_write_super(struct super_block *sb)
628 btrfs_sync_fs(sb, 1);
632 static int btrfs_get_sb(struct file_system_type *fs_type,
633 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
635 return get_sb_bdev(fs_type, flags, dev_name, data,
636 btrfs_fill_super, mnt);
639 static struct file_system_type btrfs_fs_type = {
640 .owner = THIS_MODULE,
642 .get_sb = btrfs_get_sb,
643 .kill_sb = kill_block_super,
644 .fs_flags = FS_REQUIRES_DEV,
647 static struct super_operations btrfs_super_ops = {
648 .statfs = simple_statfs,
649 .delete_inode = btrfs_delete_inode,
650 .put_super = btrfs_put_super,
651 .read_inode = btrfs_read_locked_inode,
652 .write_super = btrfs_write_super,
653 .sync_fs = btrfs_sync_fs,
654 .write_inode = btrfs_write_inode,
657 static struct inode_operations btrfs_dir_inode_operations = {
658 .lookup = btrfs_lookup,
659 .create = btrfs_create,
660 .unlink = btrfs_unlink,
661 .mkdir = btrfs_mkdir,
664 static struct file_operations btrfs_dir_file_operations = {
665 .llseek = generic_file_llseek,
666 .read = generic_read_dir,
667 .readdir = btrfs_readdir,
671 static int __init init_btrfs_fs(void)
673 printk("btrfs loaded!\n");
674 return register_filesystem(&btrfs_fs_type);
677 static void __exit exit_btrfs_fs(void)
679 unregister_filesystem(&btrfs_fs_type);
680 printk("btrfs unloaded\n");
683 module_init(init_btrfs_fs)
684 module_exit(exit_btrfs_fs)
686 MODULE_LICENSE("GPL");