From: Anand Jain <Anand.Jain@xxxxxxxxxx>
Add BTRFS_FEATURE_INCOMPAT_SPARE_DEV (400) flag to identify
a spare device.
Along with this it checks in the mount context that a spare
device will fail to mount. As spare devices aren't mountable.
Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
Tested-by: Austin S. Hemmelgarn <ahferroin7@xxxxxxxxx>
Tested-by: Yauhen Kharuzhy <yauhen.kharuzhy@xxxxxxxxxxxxx>
---
V6: rebase on for-next
fs/btrfs/ctree.h | 3 ++-
include/uapi/linux/btrfs.h | 1 +
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 92e689787cae..728712baf5d5 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -279,7 +279,8 @@ struct btrfs_super_block {
BTRFS_FEATURE_INCOMPAT_RAID56 | \
BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
- BTRFS_FEATURE_INCOMPAT_NO_HOLES)
+ BTRFS_FEATURE_INCOMPAT_NO_HOLES | \
+ BTRFS_FEATURE_INCOMPAT_SPARE_DEV)
#define BTRFS_FEATURE_INCOMPAT_SAFE_SET \
(BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index 23c6960e94a4..c9ff6734e734 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -263,6 +263,7 @@ struct btrfs_ioctl_fs_info_args {
#define BTRFS_FEATURE_INCOMPAT_RAID56 (1ULL << 7)
#define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA (1ULL << 8)
#define BTRFS_FEATURE_INCOMPAT_NO_HOLES (1ULL << 9)
+#define BTRFS_FEATURE_INCOMPAT_SPARE_DEV (1ULL << 10)
struct btrfs_ioctl_feature_flags {
__u64 compat_flags;
--
2.7.0
--
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