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btrfs: Move btrfs_raid_array to public

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This array is used to record attributes of each raid type,
make it public, and many functions will benifit with this array.

For example, num_tolerated_disk_barrier_failures(), we can
avoid complex conditions in this function, and get raid attribute
simply by accessing above array.

It can also make code logic simple, reduce duplication code, and
increase maintainability.

Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Zhao Lei
2015-09-15 21:08:06 +08:00
committed by David Sterba
parent e9cf439f0d
commit af90204750
2 changed files with 73 additions and 59 deletions
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4
fs/btrfs/volumes.h
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@@ -338,6 +338,10 @@ struct btrfs_raid_attr {
int ncopies; /* how many copies to data has */
};
extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
extern const u64 btrfs_raid_group[BTRFS_NR_RAID_TYPES];
struct map_lookup {
u64 type;
int io_align;