[RFC PATCH 13/31] btrfs: do not checksum for free space inode

[Goldwyn Rodrigues <rgoldwyn@suse.de>]

From: Goldwyn Rodrigues <rgoldwyn@suse.com>

Free space inode writes should not be checksummed.

Q: Now sure why this is required now (as opposed to earlier), but it
would fail on writing free_space_inode. How is this avoided in the
existing code?

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
---
 fs/btrfs/disk-io.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index d1d5091a8385..3af505ec22dc 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -946,9 +946,12 @@ blk_status_t btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio,
 			goto out_w_error;
 		ret = btrfs_map_bio(fs_info, bio, mirror_num);
 	} else if (!should_async_write(fs_info, BTRFS_I(inode))) {
-		ret = btree_csum_one_bio(bio);
-		if (ret)
-			goto out_w_error;
+		/* Do not checksum free space inode */
+		if (!btrfs_is_free_space_inode(BTRFS_I(inode))) {
+			ret = btree_csum_one_bio(bio);
+			if (ret)
+				goto out_w_error;
+		}
 		ret = btrfs_map_bio(fs_info, bio, mirror_num);
 	} else {
 		/*
-- 
2.31.1