[v5,04/15] btrfs-progs: add new HMZONED feature flag

Commit Message

Naohiro Aota Dec. 4, 2019, 8:25 a.m. UTC

With this feature enabled, a zoned block device aware btrfs allocates block
groups aligned to the device zones and always write in sequential zones at
the zone write pointer position.

Enabling this feature also disable conversion from ext4 volumes.

Signed-off-by: Naohiro Aota <[e-mail]>
---
 cmds/inspect-dump-super.c | 1 +
 common/fsfeatures.c       | 8 ++++++++
 common/fsfeatures.h       | 2 +-
 ctree.h                   | 4 +++-
 4 files changed, 13 insertions(+), 2 deletions(-)

Patch

diff --git a/cmds/inspect-dump-super.c b/cmds/inspect-dump-super.c
index f22633b99390..ddb2120fb397 100644
--- a/cmds/inspect-dump-super.c
+++ b/cmds/inspect-dump-super.c
@@ -229,6 +229,7 @@  static struct readable_flag_entry incompat_flags_array[] = {
 	DEF_INCOMPAT_FLAG_ENTRY(NO_HOLES),
 	DEF_INCOMPAT_FLAG_ENTRY(METADATA_UUID),
 	DEF_INCOMPAT_FLAG_ENTRY(RAID1C34),
+	DEF_INCOMPAT_FLAG_ENTRY(HMZONED)
 };
 static const int incompat_flags_num = sizeof(incompat_flags_array) /
 				      sizeof(struct readable_flag_entry);
diff --git a/common/fsfeatures.c b/common/fsfeatures.c
index ac12d57b25a3..929a076e7b69 100644
--- a/common/fsfeatures.c
+++ b/common/fsfeatures.c
@@ -92,6 +92,14 @@  static const struct btrfs_fs_feature {
 		NULL, 0,
 		NULL, 0,
 		"RAID1 with 3 or 4 copies" },
+#ifdef BTRFS_ZONED
+	{ "hmzoned", BTRFS_FEATURE_INCOMPAT_HMZONED,
+		"hmzoned",
+		NULL, 0,
+		NULL, 0,
+		NULL, 0,
+		"support Host-Managed Zoned devices" },
+#endif
 	/* Keep this one last */
 	{ "list-all", BTRFS_FEATURE_LIST_ALL, NULL }
 };
diff --git a/common/fsfeatures.h b/common/fsfeatures.h
index 3cc9452a3327..0918ee1aa113 100644
--- a/common/fsfeatures.h
+++ b/common/fsfeatures.h
@@ -25,7 +25,7 @@ 
 		| BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)
 
 /*
- * Avoid multi-device features (RAID56) and mixed block groups
+ * Avoid multi-device features (RAID56), mixed block groups, and hmzoned device
  */
 #define BTRFS_CONVERT_ALLOWED_FEATURES				\
 	(BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF			\
diff --git a/ctree.h b/ctree.h
index 3e50d0863bde..34fd7d00cabf 100644
--- a/ctree.h
+++ b/ctree.h
@@ -493,6 +493,7 @@  struct btrfs_super_block {
 #define BTRFS_FEATURE_INCOMPAT_NO_HOLES		(1ULL << 9)
 #define BTRFS_FEATURE_INCOMPAT_METADATA_UUID    (1ULL << 10)
 #define BTRFS_FEATURE_INCOMPAT_RAID1C34		(1ULL << 11)
+#define BTRFS_FEATURE_INCOMPAT_HMZONED		(1ULL << 12)
 
 #define BTRFS_FEATURE_COMPAT_SUPP		0ULL
 
@@ -517,7 +518,8 @@  struct btrfs_super_block {
 	 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |	\
 	 BTRFS_FEATURE_INCOMPAT_NO_HOLES |		\
 	 BTRFS_FEATURE_INCOMPAT_RAID1C34 |		\
-	 BTRFS_FEATURE_INCOMPAT_METADATA_UUID)
+	 BTRFS_FEATURE_INCOMPAT_METADATA_UUID |		\
+	 BTRFS_FEATURE_INCOMPAT_HMZONED)
 
 /*
  * A leaf is full of items. offset and size tell us where to find