mirror of https://gitee.com/openkylin/linux.git
Btrfs: unlink and delete_inode
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
David Woodhouse
parent
78fae27ebf
commit
134e973134
117
fs/btrfs/super.c
117
fs/btrfs/super.c
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@ -187,6 +187,104 @@ static void btrfs_read_locked_inode(struct inode *inode)
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return;
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}
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static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
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{
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struct btrfs_path path;
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struct btrfs_root *root;
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struct btrfs_trans_handle *trans;
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const char *name = dentry->d_name.name;
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int name_len = dentry->d_name.len;
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int ret;
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u64 objectid;
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struct btrfs_dir_item *di;
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btrfs_init_path(&path);
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root = btrfs_sb(dir->i_sb);
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mutex_lock(&root->fs_info->fs_mutex);
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trans = btrfs_start_transaction(root, 1);
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ret = btrfs_lookup_dir_item(trans, root, &path, dir->i_ino,
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name, name_len, -1);
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if (ret < 0)
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goto err;
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if (ret > 0) {
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ret = -ENOENT;
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goto err;
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}
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di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
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struct btrfs_dir_item);
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objectid = btrfs_dir_objectid(di);
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ret = btrfs_del_item(trans, root, &path);
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BUG_ON(ret);
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dentry->d_inode->i_ctime = dir->i_ctime;
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err:
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btrfs_release_path(root, &path);
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btrfs_end_transaction(trans, root);
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mutex_unlock(&root->fs_info->fs_mutex);
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if (ret == 0)
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inode_dec_link_count(dentry->d_inode);
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return ret;
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}
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static int btrfs_free_inode(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct inode *inode)
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{
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u64 objectid = inode->i_ino;
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struct btrfs_path path;
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struct btrfs_inode_map_item *map;
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struct btrfs_key stat_data_key;
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int ret;
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clear_inode(inode);
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btrfs_init_path(&path);
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ret = btrfs_lookup_inode_map(trans, root, &path, objectid, -1);
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if (ret) {
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if (ret > 0)
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ret = -ENOENT;
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btrfs_release_path(root, &path);
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goto error;
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}
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map = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
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struct btrfs_inode_map_item);
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btrfs_disk_key_to_cpu(&stat_data_key, &map->key);
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ret = btrfs_del_item(trans, root->fs_info->inode_root, &path);
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BUG_ON(ret);
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btrfs_release_path(root, &path);
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btrfs_init_path(&path);
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ret = btrfs_lookup_inode(trans, root, &path, objectid, -1);
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BUG_ON(ret);
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ret = btrfs_del_item(trans, root, &path);
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BUG_ON(ret);
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btrfs_release_path(root, &path);
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error:
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return ret;
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}
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static void btrfs_delete_inode(struct inode *inode)
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{
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struct btrfs_trans_handle *trans;
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struct btrfs_root *root = btrfs_sb(inode->i_sb);
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truncate_inode_pages(&inode->i_data, 0);
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if (is_bad_inode(inode)) {
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goto no_delete;
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}
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inode->i_size = 0;
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if (inode->i_blocks)
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WARN_ON(1);
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mutex_lock(&root->fs_info->fs_mutex);
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trans = btrfs_start_transaction(root, 1);
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btrfs_free_inode(trans, root, inode);
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btrfs_end_transaction(trans, root);
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mutex_unlock(&root->fs_info->fs_mutex);
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return;
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no_delete:
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clear_inode(inode);
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}
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static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
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ino_t *ino)
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{
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@ -272,6 +370,13 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
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leaf = btrfs_buffer_leaf(path.nodes[0]);
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nritems = btrfs_header_nritems(&leaf->header);
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slot = path.slots[0];
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#if 0
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page_cache_readahead(
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inode->i_sb->s_bdev->bd_inode->i_mapping,
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&filp->f_ra, filp,
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path.nodes[0]->b_blocknr >>
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(PAGE_CACHE_SHIFT - inode->i_blkbits), 1);
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#endif
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} else {
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slot++;
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path.slots[0]++;
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@ -441,8 +546,6 @@ static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
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d_instantiate(dentry, inode);
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return 0;
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}
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inode_dec_link_count(inode);
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iput(inode);
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return err;
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}
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@ -453,6 +556,7 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
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struct btrfs_root *root = btrfs_sb(dir->i_sb);
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struct inode *inode;
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int err;
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int drop_inode = 0;
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mutex_lock(&root->fs_info->fs_mutex);
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trans = btrfs_start_transaction(root, 1);
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@ -462,10 +566,16 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
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goto out_unlock;
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// FIXME mark the inode dirty
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err = btrfs_add_nondir(trans, dentry, inode);
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if (err)
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drop_inode = 1;
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dir->i_sb->s_dirt = 1;
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btrfs_end_transaction(trans, root);
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out_unlock:
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mutex_unlock(&root->fs_info->fs_mutex);
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if (drop_inode) {
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inode_dec_link_count(inode);
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iput(inode);
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}
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return err;
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}
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@ -516,7 +626,7 @@ static struct file_system_type btrfs_fs_type = {
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static struct super_operations btrfs_super_ops = {
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.statfs = simple_statfs,
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.drop_inode = generic_delete_inode,
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.delete_inode = btrfs_delete_inode,
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.put_super = btrfs_put_super,
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.read_inode = btrfs_read_locked_inode,
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.write_super = btrfs_write_super,
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@ -526,6 +636,7 @@ static struct super_operations btrfs_super_ops = {
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static struct inode_operations btrfs_dir_inode_operations = {
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.lookup = btrfs_lookup,
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.create = btrfs_create,
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.unlink = btrfs_unlink,
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};
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static struct file_operations btrfs_dir_file_operations = {
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