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authorJohannes Thumshirn <jthumshirn@suse.de>2019-10-07 12:11:04 +0300
committerDavid Sterba <dsterba@suse.com>2019-11-18 19:51:43 +0300
commit41e6d2a808ad89d34c662ba8dd1209c4fefb1416 (patch)
treefc31a2b2c617bb36452b37c91530543a5e517996 /fs/btrfs/sysfs.c
parentf7cea56c0fff95bd5a6cd21b9fa299f66193b604 (diff)
downloadlinux-41e6d2a808ad89d34c662ba8dd1209c4fefb1416.tar.xz
btrfs: sysfs: show used checksum driver per filesystem
Show the used driver for the checksum algorithm for the filesystem in sysfs file /sys/fs/btrfs/UUID/features/checksum, eg. crc32c (crc32c-generic) Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/sysfs.c')
-rw-r--r--fs/btrfs/sysfs.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 41eb6a313bf8..98979dd048a8 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -9,6 +9,7 @@
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/bug.h>
+#include <crypto/hash.h>
#include "ctree.h"
#include "disk-io.h"
@@ -626,6 +627,19 @@ static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj,
BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show);
+static ssize_t btrfs_checksum_show(struct kobject *kobj,
+ struct kobj_attribute *a, char *buf)
+{
+ struct btrfs_fs_info *fs_info = to_fs_info(kobj);
+ u16 csum_type = btrfs_super_csum_type(fs_info->super_copy);
+
+ return snprintf(buf, PAGE_SIZE, "%s (%s)\n",
+ btrfs_super_csum_name(csum_type),
+ crypto_shash_driver_name(fs_info->csum_shash));
+}
+
+BTRFS_ATTR(, checksum, btrfs_checksum_show);
+
static const struct attribute *btrfs_attrs[] = {
BTRFS_ATTR_PTR(, label),
BTRFS_ATTR_PTR(, nodesize),
@@ -633,6 +647,7 @@ static const struct attribute *btrfs_attrs[] = {
BTRFS_ATTR_PTR(, clone_alignment),
BTRFS_ATTR_PTR(, quota_override),
BTRFS_ATTR_PTR(, metadata_uuid),
+ BTRFS_ATTR_PTR(, checksum),
NULL,
};