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btrfs: factor out helper for single device IO check

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The check in btrfs_map_block() deciding if a particular I/O is targeting a
single device is getting more and more convoluted.

Factor out the check conditions into a helper function, with no functional
change otherwise.

Reviewed-by: Christoph Hellwig <hch@lst.de>
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 06:42:56 -08:00 committed by David Sterba
parent 96c36eaa77
commit 02d05b6416
1 changed files with 23 additions and 4 deletions
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27
fs/btrfs/volumes.c
View file

@ -6330,6 +6330,27 @@ static int set_io_stripe(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
return 0;
}
static bool is_single_device_io(struct btrfs_fs_info *fs_info,
const struct btrfs_io_stripe *smap,
const struct btrfs_chunk_map *map,
int num_alloc_stripes,
enum btrfs_map_op op, int mirror_num)
{
if (!smap)
return false;
if (num_alloc_stripes != 1)
return false;
if (btrfs_need_stripe_tree_update(fs_info, map->type) && op != BTRFS_MAP_READ)
return false;
if ((map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) && mirror_num > 1)
return false;
return true;
}
/*
* Map one logical range to one or more physical ranges.
*
@ -6532,10 +6553,8 @@ int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
* physical block information on the stack instead of allocating an
* I/O context structure.
*/
if (smap && num_alloc_stripes == 1 &&
!(btrfs_need_stripe_tree_update(fs_info, map->type) &&
op != BTRFS_MAP_READ) &&
!((map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) && mirror_num > 1)) {
if (is_single_device_io(fs_info, smap, map, num_alloc_stripes, op,
mirror_num)) {
ret = set_io_stripe(fs_info, op, logical, length, smap, map,
stripe_index, stripe_offset, stripe_nr);
if (mirror_num_ret)