btrfs-progs: Introduce btrfs_raid_array and related infrastructures

As part of the effort to unify code and behavior between btrfs-progs and
kernel, copy the btrfs_raid_array from kernel to btrfs-progs.

So later we can use the btrfs_raid_array[] to get needed raid info other
than manually do if-else branches.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/ctree.h b/ctree.h
index 17cdac7..c76849d 100644 (file)
--- a/ctree.h
+++ b/ctree.h
@@ -958,7 +958,17 @@ struct btrfs_csum_item {
 #define BTRFS_BLOCK_GROUP_RAID5        (1ULL << 7)
 #define BTRFS_BLOCK_GROUP_RAID6        (1ULL << 8)
 #define BTRFS_BLOCK_GROUP_RESERVED     BTRFS_AVAIL_ALLOC_BIT_SINGLE
-#define BTRFS_NR_RAID_TYPES             7
+
+enum btrfs_raid_types {
+       BTRFS_RAID_RAID10,
+       BTRFS_RAID_RAID1,
+       BTRFS_RAID_DUP,
+       BTRFS_RAID_RAID0,
+       BTRFS_RAID_SINGLE,
+       BTRFS_RAID_RAID5,
+       BTRFS_RAID_RAID6,
+       BTRFS_NR_RAID_TYPES
+};
 
 #define BTRFS_BLOCK_GROUP_TYPE_MASK    (BTRFS_BLOCK_GROUP_DATA |    \
                                         BTRFS_BLOCK_GROUP_SYSTEM |  \

diff --git a/volumes.c b/volumes.c
index 677d085..00acaa0 100644 (file)
--- a/volumes.c
+++ b/volumes.c
@@ -30,6 +30,72 @@
 #include "utils.h"
 #include "kernel-lib/raid56.h"
 
+const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
+       [BTRFS_RAID_RAID10] = {
+               .sub_stripes    = 2,
+               .dev_stripes    = 1,
+               .devs_max       = 0,    /* 0 == as many as possible */
+               .devs_min       = 4,
+               .tolerated_failures = 1,
+               .devs_increment = 2,
+               .ncopies        = 2,
+       },
+       [BTRFS_RAID_RAID1] = {
+               .sub_stripes    = 1,
+               .dev_stripes    = 1,
+               .devs_max       = 2,
+               .devs_min       = 2,
+               .tolerated_failures = 1,
+               .devs_increment = 2,
+               .ncopies        = 2,
+       },
+       [BTRFS_RAID_DUP] = {
+               .sub_stripes    = 1,
+               .dev_stripes    = 2,
+               .devs_max       = 1,
+               .devs_min       = 1,
+               .tolerated_failures = 0,
+               .devs_increment = 1,
+               .ncopies        = 2,
+       },
+       [BTRFS_RAID_RAID0] = {
+               .sub_stripes    = 1,
+               .dev_stripes    = 1,
+               .devs_max       = 0,
+               .devs_min       = 2,
+               .tolerated_failures = 0,
+               .devs_increment = 1,
+               .ncopies        = 1,
+       },
+       [BTRFS_RAID_SINGLE] = {
+               .sub_stripes    = 1,
+               .dev_stripes    = 1,
+               .devs_max       = 1,
+               .devs_min       = 1,
+               .tolerated_failures = 0,
+               .devs_increment = 1,
+               .ncopies        = 1,
+       },
+       [BTRFS_RAID_RAID5] = {
+               .sub_stripes    = 1,
+               .dev_stripes    = 1,
+               .devs_max       = 0,
+               .devs_min       = 2,
+               .tolerated_failures = 1,
+               .devs_increment = 1,
+               .ncopies        = 2,
+       },
+       [BTRFS_RAID_RAID6] = {
+               .sub_stripes    = 1,
+               .dev_stripes    = 1,
+               .devs_max       = 0,
+               .devs_min       = 3,
+               .tolerated_failures = 2,
+               .devs_increment = 1,
+               .ncopies        = 3,
+       },
+};
+
 struct stripe {
        struct btrfs_device *dev;
        u64 physical;

diff --git a/volumes.h b/volumes.h
index 11572e7..bc3516a 100644 (file)
--- a/volumes.h
+++ b/volumes.h
@@ -108,6 +108,36 @@ struct map_lookup {
        struct btrfs_bio_stripe stripes[];
 };
 
+struct btrfs_raid_attr {
+       int sub_stripes;        /* sub_stripes info for map */
+       int dev_stripes;        /* stripes per dev */
+       int devs_max;           /* max devs to use */
+       int devs_min;           /* min devs needed */
+       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 */
+};
+
+extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
+
+static inline enum btrfs_raid_types 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_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 */
+}
+
 #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
                            (sizeof(struct btrfs_bio_stripe) * (n)))
 #define btrfs_map_lookup_size(n) (sizeof(struct map_lookup) + \