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[4/4] btrfs: sysfs: print all loaded csums implementations

Message ID db927df81a8a70bf739c62eb8f4757f5e58c2867.1659106597.git.dsterba@suse.com (mailing list archive)
State New, archived
Headers show
Series Selectable checksum implementation | expand

Commit Message

David Sterba July 29, 2022, 2:59 p.m. UTC 
Extend the sysfs FSID/checksum file and append lines with the selector
strings and implementation if loaded, or 'none'.

Output may look like:

  crc32c (crc32c-generic)
  generic: crc32c-generic
  accel:   crc32c-intel

Scripts that rely on single line in the file need to be updated.

All available and loaded implementations can be found in /proc/crypto .

Signed-off-by: David Sterba <dsterba@suse.com>
---
 fs/btrfs/sysfs.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)
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Patch

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 0909f1da425c..9ce353184c46 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -937,9 +937,18 @@  static ssize_t btrfs_checksum_show(struct kobject *kobj,
 	struct btrfs_fs_info *fs_info = to_fs_info(kobj);
 	u16 csum_type = btrfs_super_csum_type(fs_info->super_copy);
 
-	return sysfs_emit(buf, "%s (%s)\n",
-			  btrfs_super_csum_name(csum_type),
-			  crypto_shash_driver_name(fs_info->csum_shash[CSUM_DEFAULT]));
+	return sysfs_emit(buf,
+			"%s (%s)\n"
+			"generic: %s\n"
+			"accel:   %s\n",
+			btrfs_super_csum_name(csum_type),
+			crypto_shash_driver_name(fs_info->csum_shash[CSUM_DEFAULT]),
+			fs_info->csum_shash[CSUM_GENERIC]
+			? crypto_shash_driver_name(fs_info->csum_shash[CSUM_GENERIC])
+			: "none",
+			fs_info->csum_shash[CSUM_ACCEL]
+			? crypto_shash_driver_name(fs_info->csum_shash[CSUM_ACCEL])
+			: "none");
 }
 
 static const char csum_impl[][8] = {