[PATCH v3 1/3] btrfs: kill btrfs_raid_type_names[]

[Anand Jain <anand.jain@oracle.com>]

Add a new member struct btrfs_raid_attr::raid_name so that
btrfs_raid_array[] can maintain the name of the raid type,
and so we can kill btrfs_raid_type_names[].

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
---
v2->v3:
 use const char raid_name[8]
v1->v2:
 add space after =. Such as..
   +               .raid_name      = "raid10",

 fs/btrfs/extent-tree.c | 18 ------------------
 fs/btrfs/volumes.c     | 15 +++++++++++++++
 fs/btrfs/volumes.h     |  3 +++
 3 files changed, 18 insertions(+), 18 deletions(-)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 90d28a3727c6..4742734a73d7 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -7338,24 +7338,6 @@ wait_block_group_cache_done(struct btrfs_block_group_cache *cache)
 	return ret;
 }
 
-static const char *btrfs_raid_type_names[BTRFS_NR_RAID_TYPES] = {
-	[BTRFS_RAID_RAID10]	= "raid10",
-	[BTRFS_RAID_RAID1]	= "raid1",
-	[BTRFS_RAID_DUP]	= "dup",
-	[BTRFS_RAID_RAID0]	= "raid0",
-	[BTRFS_RAID_SINGLE]	= "single",
-	[BTRFS_RAID_RAID5]	= "raid5",
-	[BTRFS_RAID_RAID6]	= "raid6",
-};
-
-static const char *get_raid_name(enum btrfs_raid_types type)
-{
-	if (type >= BTRFS_NR_RAID_TYPES)
-		return NULL;
-
-	return btrfs_raid_type_names[type];
-}
-
 enum btrfs_loop_type {
 	LOOP_CACHING_NOWAIT = 0,
 	LOOP_CACHING_WAIT = 1,
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 9c29fdca9075..5bb18ad6433d 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -52,6 +52,7 @@ const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
 		.tolerated_failures = 1,
 		.devs_increment	= 2,
 		.ncopies	= 2,
+		.raid_name	= "raid10",
 	},
 	[BTRFS_RAID_RAID1] = {
 		.sub_stripes	= 1,
@@ -61,6 +62,7 @@ const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
 		.tolerated_failures = 1,
 		.devs_increment	= 2,
 		.ncopies	= 2,
+		.raid_name	= "raid1",
 	},
 	[BTRFS_RAID_DUP] = {
 		.sub_stripes	= 1,
@@ -70,6 +72,7 @@ const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
 		.tolerated_failures = 0,
 		.devs_increment	= 1,
 		.ncopies	= 2,
+		.raid_name	= "dup",
 	},
 	[BTRFS_RAID_RAID0] = {
 		.sub_stripes	= 1,
@@ -79,6 +82,7 @@ const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
 		.tolerated_failures = 0,
 		.devs_increment	= 1,
 		.ncopies	= 1,
+		.raid_name	= "raid0",
 	},
 	[BTRFS_RAID_SINGLE] = {
 		.sub_stripes	= 1,
@@ -88,6 +92,7 @@ const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
 		.tolerated_failures = 0,
 		.devs_increment	= 1,
 		.ncopies	= 1,
+		.raid_name	= "single",
 	},
 	[BTRFS_RAID_RAID5] = {
 		.sub_stripes	= 1,
@@ -97,6 +102,7 @@ const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
 		.tolerated_failures = 1,
 		.devs_increment	= 1,
 		.ncopies	= 2,
+		.raid_name	= "raid5",
 	},
 	[BTRFS_RAID_RAID6] = {
 		.sub_stripes	= 1,
@@ -106,9 +112,18 @@ const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
 		.tolerated_failures = 2,
 		.devs_increment	= 1,
 		.ncopies	= 3,
+		.raid_name	= "raid6",
 	},
 };
 
+const char *get_raid_name(enum btrfs_raid_types type)
+{
+	if (type >= BTRFS_NR_RAID_TYPES)
+		return NULL;
+
+	return btrfs_raid_array[type].raid_name;
+}
+
 const u64 btrfs_raid_group[BTRFS_NR_RAID_TYPES] = {
 	[BTRFS_RAID_RAID10] = BTRFS_BLOCK_GROUP_RAID10,
 	[BTRFS_RAID_RAID1]  = BTRFS_BLOCK_GROUP_RAID1,
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index ef220d541d4b..d6edff847871 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -342,6 +342,7 @@ struct btrfs_raid_attr {
 	int tolerated_failures; /* max tolerated fail devs */
 	int devs_increment;	/* ndevs has to be a multiple of this */
 	int ncopies;		/* how many copies to data has */
+	const char raid_name[8];/* name of the raid */
 };
 
 extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
@@ -563,6 +564,8 @@ static inline enum btrfs_raid_types btrfs_bg_flags_to_raid_index(u64 flags)
 	return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */
 }
 
+const char *get_raid_name(enum btrfs_raid_types type);
+
 void btrfs_update_commit_device_size(struct btrfs_fs_info *fs_info);
 void btrfs_update_commit_device_bytes_used(struct btrfs_transaction *trans);
 
-- 
2.7.0