[PATCH v3 01/27] btrfs: introduce HMZONED feature flag

[Naohiro Aota]

This patch introduces the HMZONED incompat flag. The flag indicates that
the volume management will satisfy the constraints imposed by host-managed
zoned block devices.

Signed-off-by: Damien Le Moal <damien.lem...@wdc.com>
Signed-off-by: Naohiro Aota <naohiro.a...@wdc.com>
---
 fs/btrfs/sysfs.c           | 2 ++
 include/uapi/linux/btrfs.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index e6493b068294..ad708a9edd0b 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -193,6 +193,7 @@ BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);
 BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);
 BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES);
 BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID);
+BTRFS_FEAT_ATTR_INCOMPAT(hmzoned, HMZONED);
 BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE);
 
 static struct attribute *btrfs_supported_feature_attrs[] = {
@@ -207,6 +208,7 @@ static struct attribute *btrfs_supported_feature_attrs[] = {
        BTRFS_FEAT_ATTR_PTR(skinny_metadata),
        BTRFS_FEAT_ATTR_PTR(no_holes),
        BTRFS_FEAT_ATTR_PTR(metadata_uuid),
+       BTRFS_FEAT_ATTR_PTR(hmzoned),
        BTRFS_FEAT_ATTR_PTR(free_space_tree),
        NULL
 };
diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index c195896d478f..2d5e8f801135 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -270,6 +270,7 @@ struct btrfs_ioctl_fs_info_args {
 #define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA (1ULL << 8)
 #define BTRFS_FEATURE_INCOMPAT_NO_HOLES                (1ULL << 9)
 #define BTRFS_FEATURE_INCOMPAT_METADATA_UUID   (1ULL << 10)
+#define BTRFS_FEATURE_INCOMPAT_HMZONED         (1ULL << 11)
 
 struct btrfs_ioctl_feature_flags {
        __u64 compat_flags;
-- 
2.22.0