Btrfs: unlink and delete_inode

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-03-25 13:44:56 -04:00 committed by David Woodhouse
parent 78fae27ebf
commit 134e973134
1 changed files with 114 additions and 3 deletions

View File

@ -187,6 +187,104 @@ static void btrfs_read_locked_inode(struct inode *inode)
return;
}
static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
{
struct btrfs_path path;
struct btrfs_root *root;
struct btrfs_trans_handle *trans;
const char *name = dentry->d_name.name;
int name_len = dentry->d_name.len;
int ret;
u64 objectid;
struct btrfs_dir_item *di;
btrfs_init_path(&path);
root = btrfs_sb(dir->i_sb);
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
ret = btrfs_lookup_dir_item(trans, root, &path, dir->i_ino,
name, name_len, -1);
if (ret < 0)
goto err;
if (ret > 0) {
ret = -ENOENT;
goto err;
}
di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
struct btrfs_dir_item);
objectid = btrfs_dir_objectid(di);
ret = btrfs_del_item(trans, root, &path);
BUG_ON(ret);
dentry->d_inode->i_ctime = dir->i_ctime;
err:
btrfs_release_path(root, &path);
btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
if (ret == 0)
inode_dec_link_count(dentry->d_inode);
return ret;
}
static int btrfs_free_inode(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct inode *inode)
{
u64 objectid = inode->i_ino;
struct btrfs_path path;
struct btrfs_inode_map_item *map;
struct btrfs_key stat_data_key;
int ret;
clear_inode(inode);
btrfs_init_path(&path);
ret = btrfs_lookup_inode_map(trans, root, &path, objectid, -1);
if (ret) {
if (ret > 0)
ret = -ENOENT;
btrfs_release_path(root, &path);
goto error;
}
map = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
struct btrfs_inode_map_item);
btrfs_disk_key_to_cpu(&stat_data_key, &map->key);
ret = btrfs_del_item(trans, root->fs_info->inode_root, &path);
BUG_ON(ret);
btrfs_release_path(root, &path);
btrfs_init_path(&path);
ret = btrfs_lookup_inode(trans, root, &path, objectid, -1);
BUG_ON(ret);
ret = btrfs_del_item(trans, root, &path);
BUG_ON(ret);
btrfs_release_path(root, &path);
error:
return ret;
}
static void btrfs_delete_inode(struct inode *inode)
{
struct btrfs_trans_handle *trans;
struct btrfs_root *root = btrfs_sb(inode->i_sb);
truncate_inode_pages(&inode->i_data, 0);
if (is_bad_inode(inode)) {
goto no_delete;
}
inode->i_size = 0;
if (inode->i_blocks)
WARN_ON(1);
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
btrfs_free_inode(trans, root, inode);
btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
return;
no_delete:
clear_inode(inode);
}
static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
ino_t *ino)
{
@ -272,6 +370,13 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
leaf = btrfs_buffer_leaf(path.nodes[0]);
nritems = btrfs_header_nritems(&leaf->header);
slot = path.slots[0];
#if 0
page_cache_readahead(
inode->i_sb->s_bdev->bd_inode->i_mapping,
&filp->f_ra, filp,
path.nodes[0]->b_blocknr >>
(PAGE_CACHE_SHIFT - inode->i_blkbits), 1);
#endif
} else {
slot++;
path.slots[0]++;
@ -441,8 +546,6 @@ static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
d_instantiate(dentry, inode);
return 0;
}
inode_dec_link_count(inode);
iput(inode);
return err;
}
@ -453,6 +556,7 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
struct btrfs_root *root = btrfs_sb(dir->i_sb);
struct inode *inode;
int err;
int drop_inode = 0;
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
@ -462,10 +566,16 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
goto out_unlock;
// FIXME mark the inode dirty
err = btrfs_add_nondir(trans, dentry, inode);
if (err)
drop_inode = 1;
dir->i_sb->s_dirt = 1;
btrfs_end_transaction(trans, root);
out_unlock:
mutex_unlock(&root->fs_info->fs_mutex);
if (drop_inode) {
inode_dec_link_count(inode);
iput(inode);
}
return err;
}
@ -516,7 +626,7 @@ static struct file_system_type btrfs_fs_type = {
static struct super_operations btrfs_super_ops = {
.statfs = simple_statfs,
.drop_inode = generic_delete_inode,
.delete_inode = btrfs_delete_inode,
.put_super = btrfs_put_super,
.read_inode = btrfs_read_locked_inode,
.write_super = btrfs_write_super,
@ -526,6 +636,7 @@ static struct super_operations btrfs_super_ops = {
static struct inode_operations btrfs_dir_inode_operations = {
.lookup = btrfs_lookup,
.create = btrfs_create,
.unlink = btrfs_unlink,
};
static struct file_operations btrfs_dir_file_operations = {