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[06/13] btrfs: introduce BTRFS_FEATURE_INCOMPAT_SPARE_DEV

Message ID 1462889372-5274-8-git-send-email-anand.jain@oracle.com (mailing list archive)
State New, archived
Headers show

Commit Message

Anand Jain May 10, 2016, 2:09 p.m. UTC 
From: Anand Jain <Anand.Jain@oracle.com>

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@oracle.com>
Tested-by: Austin S. Hemmelgarn <ahferroin7@gmail.com>
Tested-by: Yauhen Kharuzhy <yauhen.kharuzhy@zavadatar.com>
---
V6: rebase on for-next

 fs/btrfs/ctree.h           | 3 ++-
 include/uapi/linux/btrfs.h | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)
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Patch

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;