In nocow path, we check if the extent is snapshotted in
btrfs_cross_ref_exist(). We can do the similar check earlier and avoid
unnecessary search into extent tree.
Signed-off-by: Ethan Lien <ethanl...@synology.com>
---
fs/btrfs/inode.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index d241285a0d2a..96927f2ccd4b 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1373,6 +1373,9 @@ static noinline int run_delalloc_nocow(struct inode
*inode,
btrfs_file_extent_encryption(leaf, fi) ||
btrfs_file_extent_other_encoding(leaf, fi))
goto out_check;
+ if (btrfs_file_extent_generation(leaf, fi) <=
+ btrfs_root_last_snapshot(&root->root_item))
+ goto out_check;
if (extent_type == BTRFS_FILE_EXTENT_REG && !force)
goto out_check;
if (btrfs_extent_readonly(fs_info, disk_bytenr))
@@ -7368,6 +7371,10 @@ noinline int can_nocow_extent(struct inode *inode, u64
offset, u64 *len,
btrfs_file_extent_other_encoding(leaf, fi))
goto out;
+ if (btrfs_file_extent_generation(leaf, fi) <=
+ btrfs_root_last_snapshot(&root->root_item))
+ goto out;
+
backref_offset = btrfs_file_extent_offset(leaf, fi);
if (orig_start) {
--
2.17.0
--
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