On 13.04.2012 16:05, Ilya Dryomov wrote:
> Fix a bug, where in case we need to adjust stripe_size so that the
> length of the resulting chunk is less than or equal to max_chunk_size,
> DUP chunks turn out to be only half as big as they could be.
>
> Cc: Arne Jansen <sensille@xxxxxxx>
> Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
> ---
> fs/btrfs/volumes.c | 6 ++++--
> 1 files changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
> index a872b48..c462d84 100644
> --- a/fs/btrfs/volumes.c
> +++ b/fs/btrfs/volumes.c
> @@ -3324,12 +3324,14 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
> stripe_size = devices_info[ndevs-1].max_avail;
> num_stripes = ndevs * dev_stripes;
>
> - if (stripe_size * num_stripes > max_chunk_size * ncopies) {
> + if (stripe_size * ndevs > max_chunk_size * ncopies) {
> stripe_size = max_chunk_size * ncopies;
> - do_div(stripe_size, num_stripes);
> + do_div(stripe_size, ndevs);
> }
>
> do_div(stripe_size, dev_stripes);
> +
> + /* align to BTRFS_STRIPE_LEN */
> do_div(stripe_size, BTRFS_STRIPE_LEN);
> stripe_size *= BTRFS_STRIPE_LEN;
>
Reviewed-by: Arne Jansen <sensille@xxxxxxx>
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