From c8a5f8ca9a9c7d5c5bc31d54f47ea9d86f93ed69 Mon Sep 17 00:00:00 2001 From: David Sterba Date: Wed, 22 Jun 2022 20:45:18 +0200 Subject: [PATCH] btrfs: print checksum type and implementation at mount time 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 Reviewed-by: Nikolay Borisov Signed-off-by: David Sterba --- fs/btrfs/disk-io.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 4f514919b03b..243bd7bd79cd 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -2425,6 +2425,9 @@ static int btrfs_init_csum_hash(struct btrfs_fs_info *fs_info, u16 csum_type) 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; }