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[RFC,01/11] btrfs: update an stale comment on btrfs_submit_bio_hook()

Message ID 20211128055259.39249-2-wqu@suse.com (mailing list archive)
State New, archived
Headers show
Series btrfs: split bio at btrfs_map_bio() time | expand

Commit Message

Qu Wenruo Nov. 28, 2021, 5:52 a.m. UTC 
This function is renamed to btrfs_submit_data_bio(), update the comment
and add extra reason why it doesn't completely follow the same rule in
btrfs_submit_data_bio().

Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 fs/btrfs/inode.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
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Patch

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 91f7ed27e421..91c59b6e279d 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8197,7 +8197,13 @@  static inline blk_status_t btrfs_submit_dio_bio(struct bio *bio,
 	bool write = btrfs_op(bio) == BTRFS_MAP_WRITE;
 	blk_status_t ret;
 
-	/* Check btrfs_submit_bio_hook() for rules about async submit. */
+	/*
+	 * Check btrfs_submit_data_bio() for rules about async submit.
+	 *
+	 * The only exception is for RAID56, when there are more than one bios
+	 * to submit, async submit seems to make it harder to collect csums
+	 * for the full stripe.
+	 */
 	if (async_submit)
 		async_submit = !atomic_read(&BTRFS_I(inode)->sync_writers);