On 30.01.2018 08:28, Anand Jain wrote:
> Drop optimal argument from the function find_live_mirror()
> as we can deduce it in the function itself.
>
> Signed-off-by: Anand Jain <anand.j...@oracle.com>
> ---
> fs/btrfs/volumes.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
> index 9c9d987838c2..a61715677b67 100644
> --- a/fs/btrfs/volumes.c
> +++ b/fs/btrfs/volumes.c
> @@ -5253,10 +5253,11 @@ int btrfs_is_parity_mirror(struct btrfs_fs_info
> *fs_info, u64 logical, u64 len)
>
> static int find_live_mirror(struct btrfs_fs_info *fs_info,
> struct map_lookup *map, int first,
> - int optimal, int dev_replace_is_ongoing)
> + int dev_replace_is_ongoing)
> {
> int i;
> int num;
> + int optimal;
> int tolerance;
> struct btrfs_device *srcdev;
>
> @@ -5268,6 +5269,8 @@ static int find_live_mirror(struct btrfs_fs_info
> *fs_info,
> else
> num = map->num_stripes;
>
> + optimal = first + current->pid % num;
> +
> if (dev_replace_is_ongoing &&
> fs_info->dev_replace.cont_reading_from_srcdev_mode ==
> BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID)
> @@ -5821,7 +5824,6 @@ static int __btrfs_map_block(struct btrfs_fs_info
> *fs_info,
> stripe_index = mirror_num - 1;
> else {
> stripe_index = find_live_mirror(fs_info, map, 0,
> - current->pid % map->num_stripes,
> dev_replace_is_ongoing);
> mirror_num = stripe_index + 1;
> }
> @@ -5849,8 +5851,6 @@ static int __btrfs_map_block(struct btrfs_fs_info
> *fs_info,
> int old_stripe_index = stripe_index;
> stripe_index = find_live_mirror(fs_info, map,
> stripe_index,
> - stripe_index +
> - current->pid % map->sub_stripes,
The value of optimal here (BTRFS_BLOCK_GROUP_RAID10) is different than
the value of optimal in BTRFS_BLOCK_GROUP_RAID1 case. So you need to put
optimal in the conditional branch you added in the previous patch. In
raid 1 case:
optimal = current->pid % num;
In raid 10:
optimal = first + current->pid % num;
to current semantics
> dev_replace_is_ongoing);
> mirror_num = stripe_index - old_stripe_index + 1;
> }
>
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