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btrfs: use btrfs_raid_array to calculate number of parity stripes

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Use the raid table instead of hard coded values and rename the helper as
it is exported.  This could make later extension on RAID56 based
profiles easier.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2022-05-13 16:34:30 +08:00 committed by David Sterba
parent 6dead96c1a
commit 0b30f71945
4 changed files with 11 additions and 19 deletions
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10
fs/btrfs/raid56.c
View File

@ -922,7 +922,6 @@ static struct btrfs_raid_bio *alloc_rbio(struct btrfs_fs_info *fs_info,
const unsigned int stripe_nsectors = stripe_len >> fs_info->sectorsize_bits;
const unsigned int num_sectors = stripe_nsectors * real_stripes;
struct btrfs_raid_bio *rbio;
int nr_data = 0;
void *p;
ASSERT(IS_ALIGNED(stripe_len, PAGE_SIZE));
@ -976,14 +975,9 @@ static struct btrfs_raid_bio *alloc_rbio(struct btrfs_fs_info *fs_info,
CONSUME_ALLOC(rbio->finish_pointers, real_stripes);
#undef CONSUME_ALLOC
if (bioc->map_type & BTRFS_BLOCK_GROUP_RAID5)
nr_data = real_stripes - 1;
else if (bioc->map_type & BTRFS_BLOCK_GROUP_RAID6)
nr_data = real_stripes - 2;
else
BUG();
ASSERT(btrfs_nr_parity_stripes(bioc->map_type));
rbio->nr_data = real_stripes - btrfs_nr_parity_stripes(bioc->map_type);
rbio->nr_data = nr_data;
return rbio;
}

12
fs/btrfs/raid56.h
View File

@ -155,19 +155,9 @@ struct raid56_bio_trace_info {
u8 stripe_nr;
};
static inline int nr_parity_stripes(const struct map_lookup *map)
{
if (map->type & BTRFS_BLOCK_GROUP_RAID5)
return 1;
else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
return 2;
else
return 0;
}
static inline int nr_data_stripes(const struct map_lookup *map)
{
return map->num_stripes - nr_parity_stripes(map);
return map->num_stripes - btrfs_nr_parity_stripes(map->type);
}
#define RAID5_P_STRIPE ((u64)-2)

7
fs/btrfs/volumes.c
View File

@ -182,6 +182,13 @@ const char *btrfs_bg_type_to_raid_name(u64 flags)
return btrfs_raid_array[index].raid_name;
}
int btrfs_nr_parity_stripes(u64 type)
{
enum btrfs_raid_types index = btrfs_bg_flags_to_raid_index(type);
return btrfs_raid_array[index].nparity;
}
/*
* Fill @buf with textual description of @bg_flags, no more than @size_buf
* bytes including terminating null byte.

1
fs/btrfs/volumes.h
View File

@ -634,6 +634,7 @@ int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
u64 logical);
u64 btrfs_calc_stripe_length(const struct extent_map *em);
int btrfs_nr_parity_stripes(u64 type);
int btrfs_chunk_alloc_add_chunk_item(struct btrfs_trans_handle *trans,
struct btrfs_block_group *bg);
int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset);