From 7573df5547c00f067e4c0b2fd7cc99f3d3a2bda7 Mon Sep 17 00:00:00 2001 From: Omar Sandoval Date: Fri, 21 Aug 2020 00:39:54 -0700 Subject: [PATCH] btrfs: sysfs: export supported send stream version This reports the latest send stream version supported by the kernel as the feature in /sys/fs/btrfs/features/send_stream_version . Signed-off-by: Omar Sandoval Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/sysfs.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index c71db7a..13354de 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -14,6 +14,7 @@ #include "ctree.h" #include "discard.h" #include "disk-io.h" +#include "send.h" #include "transaction.h" #include "sysfs.h" #include "volumes.h" @@ -321,9 +322,17 @@ static ssize_t supported_checksums_show(struct kobject *kobj, } BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show); +static ssize_t send_stream_version_show(struct kobject *kobj, + struct kobj_attribute *ka, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%d\n", BTRFS_SEND_STREAM_VERSION); +} +BTRFS_ATTR(static_feature, send_stream_version, send_stream_version_show); + static struct attribute *btrfs_supported_static_feature_attrs[] = { BTRFS_ATTR_PTR(static_feature, rmdir_subvol), BTRFS_ATTR_PTR(static_feature, supported_checksums), + BTRFS_ATTR_PTR(static_feature, send_stream_version), NULL }; -- 2.7.4