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btrfs: factor out block-mapping for RAID0

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Now that we have a container for the I/O geometry that has all the needed
information for the block mappings of RAID0, factor out a helper calculating
this information.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2023-12-13 06:42:58 -08:00 committed by David Sterba
parent fd747f2d5f
commit 30e8534b53
1 changed files with 10 additions and 4 deletions
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14
fs/btrfs/volumes.c
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@ -6362,6 +6362,15 @@ static bool is_single_device_io(struct btrfs_fs_info *fs_info,
return true;
}
static void map_blocks_raid0(const struct btrfs_chunk_map *map,
struct btrfs_io_geometry *io_geom)
{
io_geom->stripe_index = io_geom->stripe_nr % map->num_stripes;
io_geom->stripe_nr /= map->num_stripes;
if (io_geom->op == BTRFS_MAP_READ)
io_geom->mirror_num = 1;
}
/*
* Map one logical range to one or more physical ranges.
*
@ -6449,10 +6458,7 @@ int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
up_read(&dev_replace->rwsem);
if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
io_geom.stripe_index = io_geom.stripe_nr % map->num_stripes;
io_geom.stripe_nr /= map->num_stripes;
if (op == BTRFS_MAP_READ)
io_geom.mirror_num = 1;
map_blocks_raid0(map, &io_geom);
} else if (map->type & BTRFS_BLOCK_GROUP_RAID1_MASK) {
if (op != BTRFS_MAP_READ) {
io_geom.num_stripes = map->num_stripes;