From: Anand Jain <anand.jain@oracle.com>
Date: Wed, 25 Apr 2018 19:01:43 +0800
Subject: btrfs: move btrfs_raid_group values to btrfs_raid_attr table
Git-commit: 41a6e8913cdff6b30ac53a24641259d117c0b101
Patch-mainline: v4.18-rc1
References: bsc#1165949

Add a new member struct btrfs_raid_attr::bg_flag so that
btrfs_raid_array can maintain the bit map flag of the raid type, and
so we can drop btrfs_raid_group.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Acked-by: Nikolay Borisov <nborisov@suse.com>
---
 fs/btrfs/disk-io.c     |    2 +-
 fs/btrfs/extent-tree.c |    2 +-
 fs/btrfs/volumes.c     |   19 ++++++++-----------
 fs/btrfs/volumes.h     |    2 +-
 4 files changed, 11 insertions(+), 14 deletions(-)

--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3548,7 +3548,7 @@ int btrfs_get_num_tolerated_disk_barrier
 	for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) {
 		if (raid_type == BTRFS_RAID_SINGLE)
 			continue;
-		if (!(flags & btrfs_raid_group[raid_type]))
+		if (!(flags & btrfs_raid_array[raid_type].bg_flag))
 			continue;
 		min_tolerated = min(min_tolerated,
 				    btrfs_raid_array[raid_type].
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4193,7 +4193,7 @@ static u64 btrfs_reduce_alloc_profile(st
 	/* First, mask out the RAID levels which aren't possible */
 	for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) {
 		if (num_devices >= btrfs_raid_array[raid_type].devs_min)
-			allowed |= btrfs_raid_group[raid_type];
+			allowed |= btrfs_raid_array[raid_type].bg_flag;
 	}
 	allowed &= flags;
 
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -51,6 +51,7 @@ const struct btrfs_raid_attr btrfs_raid_
 		.tolerated_failures = 1,
 		.devs_increment	= 2,
 		.ncopies	= 2,
+		.bg_flag	= BTRFS_BLOCK_GROUP_RAID10,
 	},
 	[BTRFS_RAID_RAID1] = {
 		.sub_stripes	= 1,
@@ -60,6 +61,7 @@ const struct btrfs_raid_attr btrfs_raid_
 		.tolerated_failures = 1,
 		.devs_increment	= 2,
 		.ncopies	= 2,
+		.bg_flag	= BTRFS_BLOCK_GROUP_RAID1,
 	},
 	[BTRFS_RAID_DUP] = {
 		.sub_stripes	= 1,
@@ -69,6 +71,7 @@ const struct btrfs_raid_attr btrfs_raid_
 		.tolerated_failures = 0,
 		.devs_increment	= 1,
 		.ncopies	= 2,
+		.bg_flag	= BTRFS_BLOCK_GROUP_DUP,
 	},
 	[BTRFS_RAID_RAID0] = {
 		.sub_stripes	= 1,
@@ -78,6 +81,7 @@ const struct btrfs_raid_attr btrfs_raid_
 		.tolerated_failures = 0,
 		.devs_increment	= 1,
 		.ncopies	= 1,
+		.bg_flag	= BTRFS_BLOCK_GROUP_RAID0,
 	},
 	[BTRFS_RAID_SINGLE] = {
 		.sub_stripes	= 1,
@@ -87,6 +91,7 @@ const struct btrfs_raid_attr btrfs_raid_
 		.tolerated_failures = 0,
 		.devs_increment	= 1,
 		.ncopies	= 1,
+		.bg_flag	= 0,
 	},
 	[BTRFS_RAID_RAID5] = {
 		.sub_stripes	= 1,
@@ -96,6 +101,7 @@ const struct btrfs_raid_attr btrfs_raid_
 		.tolerated_failures = 1,
 		.devs_increment	= 1,
 		.ncopies	= 2,
+		.bg_flag	= BTRFS_BLOCK_GROUP_RAID5,
 	},
 	[BTRFS_RAID_RAID6] = {
 		.sub_stripes	= 1,
@@ -105,19 +111,10 @@ const struct btrfs_raid_attr btrfs_raid_
 		.tolerated_failures = 2,
 		.devs_increment	= 1,
 		.ncopies	= 3,
+		.bg_flag	= BTRFS_BLOCK_GROUP_RAID6,
 	},
 };
 
-const u64 btrfs_raid_group[BTRFS_NR_RAID_TYPES] = {
-	[BTRFS_RAID_RAID10] = BTRFS_BLOCK_GROUP_RAID10,
-	[BTRFS_RAID_RAID1]  = BTRFS_BLOCK_GROUP_RAID1,
-	[BTRFS_RAID_DUP]    = BTRFS_BLOCK_GROUP_DUP,
-	[BTRFS_RAID_RAID0]  = BTRFS_BLOCK_GROUP_RAID0,
-	[BTRFS_RAID_SINGLE] = 0,
-	[BTRFS_RAID_RAID5]  = BTRFS_BLOCK_GROUP_RAID5,
-	[BTRFS_RAID_RAID6]  = BTRFS_BLOCK_GROUP_RAID6,
-};
-
 /*
  * Table to convert BTRFS_RAID_* to the error code if minimum number of devices
  * condition is not met. Zero means there's no corresponding
@@ -1802,7 +1799,7 @@ static int btrfs_check_raid_min_devices(
 	} while (read_seqretry(&fs_info->profiles_lock, seq));
 
 	for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
-		if (!(all_avail & btrfs_raid_group[i]))
+		if (!(all_avail & btrfs_raid_array[i].bg_flag))
 			continue;
 
 		if (num_devices < btrfs_raid_array[i].devs_min) {
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -336,11 +336,11 @@ 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 */
+	u64 bg_flag;		/* block group flag of the raid */
 };
 
 extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
 extern const int btrfs_raid_mindev_error[BTRFS_NR_RAID_TYPES];
-extern const u64 btrfs_raid_group[BTRFS_NR_RAID_TYPES];
 
 struct map_lookup {
 	u64 type;