struct btrfs_key key;
struct btrfs_ioctl_defrag_range_args range;
int num_defrag;
+ int index;
+ int ret;
/* get the inode */
key.objectid = defrag->root;
btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
key.offset = (u64)-1;
+
+ index = srcu_read_lock(&fs_info->subvol_srcu);
+
inode_root = btrfs_read_fs_root_no_name(fs_info, &key);
if (IS_ERR(inode_root)) {
- kmem_cache_free(btrfs_inode_defrag_cachep, defrag);
- return PTR_ERR(inode_root);
+ ret = PTR_ERR(inode_root);
+ goto cleanup;
+ }
+ if (btrfs_root_refs(&inode_root->root_item) == 0) {
+ ret = -ENOENT;
+ goto cleanup;
}
key.objectid = defrag->ino;
key.offset = 0;
inode = btrfs_iget(fs_info->sb, &key, inode_root, NULL);
if (IS_ERR(inode)) {
- kmem_cache_free(btrfs_inode_defrag_cachep, defrag);
- return PTR_ERR(inode);
+ ret = PTR_ERR(inode);
+ goto cleanup;
}
+ srcu_read_unlock(&fs_info->subvol_srcu, index);
/* do a chunk of defrag */
clear_bit(BTRFS_INODE_IN_DEFRAG, &BTRFS_I(inode)->runtime_flags);
iput(inode);
return 0;
+cleanup:
+ srcu_read_unlock(&fs_info->subvol_srcu, index);
+ kmem_cache_free(btrfs_inode_defrag_cachep, defrag);
+ return ret;
}
/*
if (err < 0 && num_written > 0)
num_written = err;
}
-out:
+
if (sync)
atomic_dec(&BTRFS_I(inode)->sync_writers);
+out:
sb_end_write(inode->i_sb);
current->backing_dev_info = NULL;
return num_written ? num_written : err;