Btrfs: update nodatacow code v2

This patch simplifies the nodatacow checker. If all references
were created after the latest snapshot, then we can avoid COW
safely. This patch also updates run_delalloc_nocow to do more
fine-grained checking.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>

1 files changed, 3 insertions, 6 deletions

diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
index b5745bb96d40..e7317c8fda29 100644
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -165,8 +165,7 @@ static inline struct rb_node *tree_search(struct btrfs_ordered_inode_tree *tree,
  * inserted.
  */
 int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
-                             u64 start, u64 len, u64 disk_len, int nocow,
-                             int compressed)
+                             u64 start, u64 len, u64 disk_len, int type)
 {
         struct btrfs_ordered_inode_tree *tree;
         struct rb_node *node;
@@ -183,10 +182,8 @@ int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
         entry->len = len;
         entry->disk_len = disk_len;
         entry->inode = inode;
-        if (nocow)
-                set_bit(BTRFS_ORDERED_NOCOW, &entry->flags);
-        if (compressed)
-                set_bit(BTRFS_ORDERED_COMPRESSED, &entry->flags);
+        if (type == BTRFS_ORDERED_NOCOW || type == BTRFS_ORDERED_COMPRESSED)
+                set_bit(type, &entry->flags);
 
         /* one ref for the tree */
         atomic_set(&entry->refs, 1);