This is a note to let you know that I've just added the patch titled
btrfs: fix fast csum implementation detection
to the 5.15-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-fix-fast-csum-implementation-detection.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 68d99ab0e9221ef54506f827576c5a914680eeaf Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 29 Mar 2023 09:13:05 +0900
Subject: btrfs: fix fast csum implementation detection
From: Christoph Hellwig <hch@xxxxxx>
commit 68d99ab0e9221ef54506f827576c5a914680eeaf upstream.
The BTRFS_FS_CSUM_IMPL_FAST flag is currently set whenever a non-generic
crc32c is detected, which is the incorrect check if the file system uses
a different checksumming algorithm. Refactor the code to only check
this if crc32c is actually used. Note that in an ideal world the
information if an algorithm is hardware accelerated or not should be
provided by the crypto API instead, but that's left for another day.
CC: stable@xxxxxxxxxxxxxxx # 5.4.x: c8a5f8ca9a9c: btrfs: print checksum type and implementation at mount time
CC: stable@xxxxxxxxxxxxxxx # 5.4.x
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/disk-io.c | 14 ++++++++++++++
fs/btrfs/super.c | 2 --
2 files changed, 14 insertions(+), 2 deletions(-)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2318,6 +2318,20 @@ static int btrfs_init_csum_hash(struct b
fs_info->csum_shash = csum_shash;
+ /*
+ * Check if the checksum implementation is a fast accelerated one.
+ * As-is this is a bit of a hack and should be replaced once the csum
+ * implementations provide that information themselves.
+ */
+ switch (csum_type) {
+ case BTRFS_CSUM_TYPE_CRC32:
+ if (!strstr(crypto_shash_driver_name(csum_shash), "generic"))
+ set_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags);
+ break;
+ default:
+ break;
+ }
+
btrfs_info(fs_info, "using %s (%s) checksum algorithm",
btrfs_super_csum_name(csum_type),
crypto_shash_driver_name(csum_shash));
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1749,8 +1749,6 @@ static struct dentry *btrfs_mount_root(s
} else {
snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev);
btrfs_sb(s)->bdev_holder = fs_type;
- if (!strstr(crc32c_impl(), "generic"))
- set_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags);
error = btrfs_fill_super(s, fs_devices, data);
}
if (!error)
Patches currently in stable-queue which might be from hch@xxxxxx are
queue-5.15/btrfs-fix-fast-csum-implementation-detection.patch
