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-rw-r--r--fs/btrfs/volumes.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 01127a4dfe91..40d850a7beba 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -153,6 +153,32 @@ const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
},
};
+/*
+ * Convert block group flags (BTRFS_BLOCK_GROUP_*) to btrfs_raid_types, which
+ * can be used as index to access btrfs_raid_array[].
+ */
+enum btrfs_raid_types __attribute_const__ btrfs_bg_flags_to_raid_index(u64 flags)
+{
+ if (flags & BTRFS_BLOCK_GROUP_RAID10)
+ return BTRFS_RAID_RAID10;
+ else if (flags & BTRFS_BLOCK_GROUP_RAID1)
+ return BTRFS_RAID_RAID1;
+ else if (flags & BTRFS_BLOCK_GROUP_RAID1C3)
+ return BTRFS_RAID_RAID1C3;
+ else if (flags & BTRFS_BLOCK_GROUP_RAID1C4)
+ return BTRFS_RAID_RAID1C4;
+ else if (flags & BTRFS_BLOCK_GROUP_DUP)
+ return BTRFS_RAID_DUP;
+ else if (flags & BTRFS_BLOCK_GROUP_RAID0)
+ return BTRFS_RAID_RAID0;
+ else if (flags & BTRFS_BLOCK_GROUP_RAID5)
+ return BTRFS_RAID_RAID5;
+ else if (flags & BTRFS_BLOCK_GROUP_RAID6)
+ return BTRFS_RAID_RAID6;
+
+ return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */
+}
+
const char *btrfs_bg_type_to_raid_name(u64 flags)
{
const int index = btrfs_bg_flags_to_raid_index(flags);