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btrfs: factor out RAID1 block mapping

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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 RAID1, 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 06:42:59 -08:00 committed by David Sterba
parent 30e8534b53
commit 5e36aba837
1 changed files with 21 additions and 10 deletions
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31
fs/btrfs/volumes.c
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@ -6371,6 +6371,26 @@ static void map_blocks_raid0(const struct btrfs_chunk_map *map,
io_geom->mirror_num = 1;
}
static void map_blocks_raid1(struct btrfs_fs_info *fs_info,
struct btrfs_chunk_map *map,
struct btrfs_io_geometry *io_geom,
bool dev_replace_is_ongoing)
{
if (io_geom->op != BTRFS_MAP_READ) {
io_geom->num_stripes = map->num_stripes;
return;
}
if (io_geom->mirror_num) {
io_geom->stripe_index = io_geom->mirror_num - 1;
return;
}
io_geom->stripe_index = find_live_mirror(fs_info, map, 0,
dev_replace_is_ongoing);
io_geom->mirror_num = io_geom->stripe_index + 1;
}
/*
* Map one logical range to one or more physical ranges.
*
@ -6460,16 +6480,7 @@ int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
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;
} else if (io_geom.mirror_num) {
io_geom.stripe_index = io_geom.mirror_num - 1;
} else {
io_geom.stripe_index = find_live_mirror(fs_info, map, 0,
dev_replace_is_ongoing);
io_geom.mirror_num = io_geom.stripe_index + 1;
}
map_blocks_raid1(fs_info, map, &io_geom, dev_replace_is_ongoing);
} else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
if (op != BTRFS_MAP_READ) {
io_geom.num_stripes = map->num_stripes;