This is a note to let you know that I've just added the patch titled
btrfs: print checksum type and implementation at mount time
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
btrfs-print-checksum-type-and-implementation-at-mount-time.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c8a5f8ca9a9c7d5c5bc31d54f47ea9d86f93ed69 Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@xxxxxxxx>
Date: Wed, 22 Jun 2022 20:45:18 +0200
Subject: btrfs: print checksum type and implementation at mount time
From: David Sterba <dsterba@xxxxxxxx>
commit c8a5f8ca9a9c7d5c5bc31d54f47ea9d86f93ed69 upstream.
Per user request, print the checksum type and implementation at mount
time among the messages. The checksum is user configurable and the
actual crypto implementation is useful to see for performance reasons.
The same information is also available after mount in
/sys/fs/FSID/checksum file.
Example:
[25.323662] BTRFS info (device vdb): using sha256 (sha256-generic) checksum algorithm
Link: https://github.com/kdave/btrfs-progs/issues/483
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Reviewed-by: Nikolay Borisov <nborisov@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/disk-io.c | 3 +++
1 file changed, 3 insertions(+)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2239,6 +2239,9 @@ static int btrfs_init_csum_hash(struct b
fs_info->csum_shash = csum_shash;
+ btrfs_info(fs_info, "using %s (%s) checksum algorithm",
+ btrfs_super_csum_name(csum_type),
+ crypto_shash_driver_name(csum_shash));
return 0;
}
Patches currently in stable-queue which might be from dsterba@xxxxxxxx are
queue-5.4/btrfs-fix-fast-csum-implementation-detection.patch
queue-5.4/btrfs-print-checksum-type-and-implementation-at-mount-time.patch
