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btrfs: factor out block mapping for RAID10

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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 RAID10, 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 06:43:01 -08:00 committed by David Sterba
parent 5aeb15c8ca
commit 8938f112b9
1 changed files with 29 additions and 17 deletions
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46
fs/btrfs/volumes.c
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@ -6407,6 +6407,34 @@ static void map_blocks_dup(const struct btrfs_chunk_map *map,
io_geom->mirror_num = 1;
}
static void map_blocks_raid10(struct btrfs_fs_info *fs_info,
struct btrfs_chunk_map *map,
struct btrfs_io_geometry *io_geom,
bool dev_replace_is_ongoing)
{
u32 factor = map->num_stripes / map->sub_stripes;
int old_stripe_index;
io_geom->stripe_index = (io_geom->stripe_nr % factor) * map->sub_stripes;
io_geom->stripe_nr /= factor;
if (io_geom->op != BTRFS_MAP_READ) {
io_geom->num_stripes = map->sub_stripes;
return;
}
if (io_geom->mirror_num) {
io_geom->stripe_index += io_geom->mirror_num - 1;
return;
}
old_stripe_index = io_geom->stripe_index;
io_geom->stripe_index = find_live_mirror(fs_info, map,
io_geom->stripe_index,
dev_replace_is_ongoing);
io_geom->mirror_num = io_geom->stripe_index - old_stripe_index + 1;
}
/*
* Map one logical range to one or more physical ranges.
*
@ -6500,23 +6528,7 @@ int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
} else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
map_blocks_dup(map, &io_geom);
} else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
u32 factor = map->num_stripes / map->sub_stripes;
io_geom.stripe_index = (io_geom.stripe_nr % factor) * map->sub_stripes;
io_geom.stripe_nr /= factor;
if (op != BTRFS_MAP_READ)
io_geom.num_stripes = map->sub_stripes;
else if (io_geom.mirror_num)
io_geom.stripe_index += io_geom.mirror_num - 1;
else {
int old_stripe_index = io_geom.stripe_index;
io_geom.stripe_index = find_live_mirror(fs_info, map,
io_geom.stripe_index,
dev_replace_is_ongoing);
io_geom.mirror_num = io_geom.stripe_index - old_stripe_index + 1;
}
map_blocks_raid10(fs_info, map, &io_geom, dev_replace_is_ongoing);
} else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
if (op != BTRFS_MAP_READ || io_geom.mirror_num > 1) {
/*