On 2019/08/06 10:06, Dmitry Fomichev wrote:
> Some errors are ignored in the I/O path during queueing chunks
> for processing by chunk works. Since at least these errors are
> transient in nature, it should be possible to retry the failed
> incoming commands.
>
> The fix -
>
> Errors that can happen while queueing chunks are carried upwards
> to the main mapping function and it now returns DM_MAPIO_REQUEUE
> for any incoming requests that can not be properly queued.
>
> Error logging/debug messages are added where needed.
>
> Fixes: 3b1a94c88b79 ("dm zoned: drive-managed zoned block device target")
> Cc: [email protected]
> Signed-off-by: Dmitry Fomichev <[email protected]>
> ---
> drivers/md/dm-zoned-target.c | 22 ++++++++++++++++------
> 1 file changed, 16 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target.c
> index 1bf6e6eebee1..c1992034c099 100644
> --- a/drivers/md/dm-zoned-target.c
> +++ b/drivers/md/dm-zoned-target.c
> @@ -514,22 +514,24 @@ static void dmz_flush_work(struct work_struct *work)
> * Get a chunk work and start it to process a new BIO.
> * If the BIO chunk has no work yet, create one.
> */
> -static void dmz_queue_chunk_work(struct dmz_target *dmz, struct bio *bio)
> +static int dmz_queue_chunk_work(struct dmz_target *dmz, struct bio *bio)
> {
> unsigned int chunk = dmz_bio_chunk(dmz->dev, bio);
> struct dm_chunk_work *cw;
> + int ret = 0;
>
> mutex_lock(&dmz->chunk_lock);
>
> /* Get the BIO chunk work. If one is not active yet, create one */
> cw = radix_tree_lookup(&dmz->chunk_rxtree, chunk);
> if (!cw) {
> - int ret;
>
> /* Create a new chunk work */
> cw = kmalloc(sizeof(struct dm_chunk_work), GFP_NOIO);
> - if (!cw)
> + if (unlikely(!cw)) {
> + ret = -ENOMEM;
> goto out;
> + }
>
> INIT_WORK(&cw->work, dmz_chunk_work);
> refcount_set(&cw->refcount, 0);
> @@ -540,7 +542,6 @@ static void dmz_queue_chunk_work(struct dmz_target *dmz,
> struct bio *bio)
> ret = radix_tree_insert(&dmz->chunk_rxtree, chunk, cw);
> if (unlikely(ret)) {
> kfree(cw);
> - cw = NULL;
> goto out;
> }
> }
> @@ -548,10 +549,12 @@ static void dmz_queue_chunk_work(struct dmz_target
> *dmz, struct bio *bio)
> bio_list_add(&cw->bio_list, bio);
> dmz_get_chunk_work(cw);
>
> + dmz_reclaim_bio_acc(dmz->reclaim);
> if (queue_work(dmz->chunk_wq, &cw->work))
> dmz_get_chunk_work(cw);
> out:
> mutex_unlock(&dmz->chunk_lock);
> + return ret;
> }
>
> /*
> @@ -565,6 +568,7 @@ static int dmz_map(struct dm_target *ti, struct bio *bio)
> sector_t sector = bio->bi_iter.bi_sector;
> unsigned int nr_sectors = bio_sectors(bio);
> sector_t chunk_sector;
> + int ret;
>
> dmz_dev_debug(dev, "BIO op %d sector %llu + %u => chunk %llu, block
> %llu, %u blocks",
> bio_op(bio), (unsigned long long)sector, nr_sectors,
> @@ -602,8 +606,14 @@ static int dmz_map(struct dm_target *ti, struct bio *bio)
> dm_accept_partial_bio(bio, dev->zone_nr_sectors - chunk_sector);
>
> /* Now ready to handle this BIO */
> - dmz_reclaim_bio_acc(dmz->reclaim);
> - dmz_queue_chunk_work(dmz, bio);
> + ret = dmz_queue_chunk_work(dmz, bio);
> + if (ret) {
> + dmz_dev_debug(dmz->dev,
> + "BIO op %d, can't process chunk %llu, err %i\n",
> + bio_op(bio), (u64)dmz_bio_chunk(dmz->dev, bio),
> + ret);
> + return DM_MAPIO_REQUEUE;
> + }
>
> return DM_MAPIO_SUBMITTED;
> }
>
Reviewed-by: Damien Le Moal <[email protected]>
--
Damien Le Moal
Western Digital Research
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