Btrfs: Abstract similar code for btrfs_block_rsv_add{, _noflush}

btrfs_block_rsv_add{, _noflush}() have similar code, so abstract that code.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 0b044e5..0f47b3e 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3796,16 +3796,16 @@ void btrfs_free_block_rsv(struct btrfs_root *root,
        kfree(rsv);
 }
 
-int btrfs_block_rsv_add(struct btrfs_root *root,
-                       struct btrfs_block_rsv *block_rsv,
-                       u64 num_bytes)
+static inline int __block_rsv_add(struct btrfs_root *root,
+                                 struct btrfs_block_rsv *block_rsv,
+                                 u64 num_bytes, int flush)
 {
        int ret;
 
        if (num_bytes == 0)
                return 0;
 
-       ret = reserve_metadata_bytes(root, block_rsv, num_bytes, 1);
+       ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush);
        if (!ret) {
                block_rsv_add_bytes(block_rsv, num_bytes, 1);
                return 0;
@@ -3814,22 +3814,18 @@ int btrfs_block_rsv_add(struct btrfs_root *root,
        return ret;
 }
 
+int btrfs_block_rsv_add(struct btrfs_root *root,
+                       struct btrfs_block_rsv *block_rsv,
+                       u64 num_bytes)
+{
+       return __block_rsv_add(root, block_rsv, num_bytes, 1);
+}
+
 int btrfs_block_rsv_add_noflush(struct btrfs_root *root,
                                struct btrfs_block_rsv *block_rsv,
                                u64 num_bytes)
 {
-       int ret;
-
-       if (num_bytes == 0)
-               return 0;
-
-       ret = reserve_metadata_bytes(root, block_rsv, num_bytes, 0);
-       if (!ret) {
-               block_rsv_add_bytes(block_rsv, num_bytes, 1);
-               return 0;
-       }
-
-       return ret;
+       return __block_rsv_add(root, block_rsv, num_bytes, 0);
 }
 
 int btrfs_block_rsv_check(struct btrfs_root *root,