Re: [PATCH v3 7/8] md/raid1: fix IO error at logical block size granularity

On Thu, Apr 16, 2026 at 11:55 AM <[email protected]> wrote:
>
> From: Li Nan <[email protected]>
>
> RAID1 currently fixes IO error at PAGE_SIZE granularity. Fix at smaller
> granularity can handle more errors, and RAID will support logical block
> sizes larger than PAGE_SIZE in the future, where PAGE_SIZE IO will fail.
>
> Switch IO error fix granularity to logical block size.
>
> Signed-off-by: Li Nan <[email protected]>
> Reviewed-by: Yu Kuai <[email protected]>
> ---
>  drivers/md/raid1.c | 13 ++++---------
>  1 file changed, 4 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
> index 724fd4f2cc3a..de8c964ca11d 100644
> --- a/drivers/md/raid1.c
> +++ b/drivers/md/raid1.c
> @@ -2116,7 +2116,7 @@ static int fix_sync_read_error(struct r1bio *r1_bio)
>  {
>         /* Try some synchronous reads of other devices to get
>          * good data, much like with normal read errors.  Only
> -        * read into the pages we already have so we don't
> +        * read into the block we already have so we don't
>          * need to re-issue the read request.
>          * We don't need to freeze the array, because being in an
>          * active sync request, there is no normal IO, and
> @@ -2147,13 +2147,11 @@ static int fix_sync_read_error(struct r1bio *r1_bio)
>         }
>
>         while(sectors) {
> -               int s = sectors;
> +               int s = min_t(int, sectors, mddev->logical_block_size >> 9);
>                 int d = r1_bio->read_disk;
>                 int success = 0;
>                 int start;
>
> -               if (s > (PAGE_SIZE>>9))
> -                       s = PAGE_SIZE >> 9;
>                 do {
>                         if (r1_bio->bios[d]->bi_end_io == end_sync_read) {
>                                 /* No rcu protection needed here devices
> @@ -2192,7 +2190,7 @@ static int fix_sync_read_error(struct r1bio *r1_bio)
>                         if (abort)
>                                 return 0;
>
> -                       /* Try next page */
> +                       /* Try next block */
>                         sectors -= s;
>                         sect += s;
>                         off += s << 9;
> @@ -2390,14 +2388,11 @@ static void fix_read_error(struct r1conf *conf, struct r1bio *r1_bio)
>         }
>
>         while(sectors) {
> -               int s = sectors;
> +               int s = min_t(int, sectors, mddev->logical_block_size >> 9);
>                 int d = read_disk;
>                 int success = 0;
>                 int start;
>
> -               if (s > (PAGE_SIZE>>9))
> -                       s = PAGE_SIZE >> 9;
> -
>                 do {
>                         rdev = conf->mirrors[d].rdev;
>                         if (rdev &&
> --
> 2.39.2
>
>

This patch looks good to me.
Reviewed-by: Xiao Ni <[email protected]>