Btrfs: fix misuse of trans block rsv
At the beginning of create_pending_snapshot, trans->block_rsv is set
to pending->block_rsv and is used for snapshot things, however, when
it is done, we do not recover it as will.
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 7dc36fa..e24b796 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -884,6 +884,7 @@
struct btrfs_root *tree_root = fs_info->tree_root;
struct btrfs_root *root = pending->root;
struct btrfs_root *parent_root;
+ struct btrfs_block_rsv *rsv;
struct inode *parent_inode;
struct dentry *parent;
struct dentry *dentry;
@@ -895,6 +896,8 @@
u64 objectid;
u64 root_flags;
+ rsv = trans->block_rsv;
+
new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS);
if (!new_root_item) {
pending->error = -ENOMEM;
@@ -1002,6 +1005,7 @@
btrfs_orphan_post_snapshot(trans, pending);
fail:
kfree(new_root_item);
+ trans->block_rsv = rsv;
btrfs_block_rsv_release(root, &pending->block_rsv, (u64)-1);
return 0;
}