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Old 03-11-2011, 03:53 PM
Mike Snitzer
 
Default block: Require subsystems to explicitly allocate bio_set integrity mempool (was: mirrored device with thousand of mappingtableentries)

On Thu, Mar 10 2011 at 11:11am -0500,
Martin K. Petersen <mkp@mkp.net> wrote:

> >>>>> "Mike" == Mike Snitzer <snitzer@redhat.com> writes:
>
> Mike> In general this approach looks fine too. Doesn't address the
> Mike> concern I had yesterday about the blk_integrity block_size
> Mike> relative to DM (load vs resume) but I'd imagine you'd like to sort
> Mike> that out in a separate patch.
>
> Yeah, that'll come as part of my DIX1.1 patch set.

Seems my concern should be fixed independent of a larger update
patchset. Unless DIX isn't meaningful for "stable" kernels without your
full DIX1.1 update?

> I believe I've addressed all your issues below.

The block and DM changes look good. I haven't put time to the MD
changes (cc'ing neil).

Thanks,
Mike

> block: Require subsystems to explicitly allocate bio_set integrity mempool
>
> MD and DM create a new bio_set for every metadevice. Each bio_set has an
> integrity mempool attached regardless of whether the metadevice is
> capable of passing integrity metadata. This is a waste of memory.
>
> Instead we defer the allocation decision to MD and DM since we know at
> metadevice creation time whether integrity passthrough is needed or not.
>
> Automatic integrity mempool allocation can then be removed from
> bioset_create() and we make an explicit integrity allocation for the
> fs_bio_set.
>
> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
> Reported-by: Zdenek Kabelac <zkabelac@redhat.com>
> Acked-by: Mike Snitzer <snizer@redhat.com>
>
> diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
> index 38e4eb1..4e8e314 100644
> --- a/drivers/md/dm-table.c
> +++ b/drivers/md/dm-table.c
> @@ -55,6 +55,7 @@ struct dm_table {
> struct dm_target *targets;
>
> unsigned discards_supported:1;
> + unsigned integrity_supported:1;
>
> /*
> * Indicates the rw permissions for the new logical
> @@ -859,7 +860,7 @@ int dm_table_alloc_md_mempools(struct dm_table *t)
> return -EINVAL;
> }
>
> - t->mempools = dm_alloc_md_mempools(type);
> + t->mempools = dm_alloc_md_mempools(type, t->integrity_supported);
> if (!t->mempools)
> return -ENOMEM;
>
> @@ -935,8 +936,10 @@ static int dm_table_prealloc_integrity(struct dm_table *t, struct mapped_device
> struct dm_dev_internal *dd;
>
> list_for_each_entry(dd, devices, list)
> - if (bdev_get_integrity(dd->dm_dev.bdev))
> + if (bdev_get_integrity(dd->dm_dev.bdev)) {
> + t->integrity_supported = 1;
> return blk_integrity_register(dm_disk(md), NULL);
> + }
>
> return 0;
> }
> diff --git a/drivers/md/dm.c b/drivers/md/dm.c
> index eaa3af0..105963d 100644
> --- a/drivers/md/dm.c
> +++ b/drivers/md/dm.c
> @@ -2643,9 +2643,10 @@ int dm_noflush_suspending(struct dm_target *ti)
> }
> EXPORT_SYMBOL_GPL(dm_noflush_suspending);
>
> -struct dm_md_mempools *dm_alloc_md_mempools(unsigned type)
> +struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity)
> {
> struct dm_md_mempools *pools = kmalloc(sizeof(*pools), GFP_KERNEL);
> + unsigned int pool_size = (type == DM_TYPE_BIO_BASED) ? 16 : MIN_IOS;
>
> if (!pools)
> return NULL;
> @@ -2662,13 +2663,18 @@ struct dm_md_mempools *dm_alloc_md_mempools(unsigned type)
> if (!pools->tio_pool)
> goto free_io_pool_and_out;
>
> - pools->bs = (type == DM_TYPE_BIO_BASED) ?
> - bioset_create(16, 0) : bioset_create(MIN_IOS, 0);
> + pools->bs = bioset_create(pool_size, 0);
> if (!pools->bs)
> goto free_tio_pool_and_out;
>
> + if (integrity && bioset_integrity_create(pools->bs, pool_size))
> + goto free_bioset_and_out;
> +
> return pools;
>
> +free_bioset_and_out:
> + bioset_free(pools->bs);
> +
> free_tio_pool_and_out:
> mempool_destroy(pools->tio_pool);
>
> diff --git a/drivers/md/dm.h b/drivers/md/dm.h
> index 0c2dd5f..1aaf167 100644
> --- a/drivers/md/dm.h
> +++ b/drivers/md/dm.h
> @@ -149,7 +149,7 @@ void dm_kcopyd_exit(void);
> /*
> * Mempool operations
> */
> -struct dm_md_mempools *dm_alloc_md_mempools(unsigned type);
> +struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity);
> void dm_free_md_mempools(struct dm_md_mempools *pools);
>
> #endif
> diff --git a/drivers/md/linear.c b/drivers/md/linear.c
> index 0ed7f6b..b317544 100644
> --- a/drivers/md/linear.c
> +++ b/drivers/md/linear.c
> @@ -227,8 +227,7 @@ static int linear_run (mddev_t *mddev)
> mddev->queue->unplug_fn = linear_unplug;
> mddev->queue->backing_dev_info.congested_fn = linear_congested;
> mddev->queue->backing_dev_info.congested_data = mddev;
> - md_integrity_register(mddev);
> - return 0;
> + return md_integrity_register(mddev);
> }
>
> static void free_conf(struct rcu_head *head)
> diff --git a/drivers/md/md.c b/drivers/md/md.c
> index 818313e..f11e0bc 100644
> --- a/drivers/md/md.c
> +++ b/drivers/md/md.c
> @@ -1804,8 +1804,12 @@ int md_integrity_register(mddev_t *mddev)
> mdname(mddev));
> return -EINVAL;
> }
> - printk(KERN_NOTICE "md: data integrity on %s enabled
",
> - mdname(mddev));
> + printk(KERN_NOTICE "md: data integrity enabled on %s
", mdname(mddev));
> + if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
> + printk(KERN_ERR "md: failed to create integrity pool for %s
",
> + mdname(mddev));
> + return -EINVAL;
> + }
> return 0;
> }
> EXPORT_SYMBOL(md_integrity_register);
> diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
> index 3a62d44..54b8d7c 100644
> --- a/drivers/md/multipath.c
> +++ b/drivers/md/multipath.c
> @@ -345,7 +345,7 @@ static int multipath_remove_disk(mddev_t *mddev, int number)
> p->rdev = rdev;
> goto abort;
> }
> - md_integrity_register(mddev);
> + err = md_integrity_register(mddev);
> }
> abort:
>
> @@ -520,7 +520,10 @@ static int multipath_run (mddev_t *mddev)
> mddev->queue->unplug_fn = multipath_unplug;
> mddev->queue->backing_dev_info.congested_fn = multipath_congested;
> mddev->queue->backing_dev_info.congested_data = mddev;
> - md_integrity_register(mddev);
> +
> + if (md_integrity_register(mddev))
> + goto out_free_conf;
> +
> return 0;
>
> out_free_conf:
> diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
> index c0ac457..17c001c 100644
> --- a/drivers/md/raid0.c
> +++ b/drivers/md/raid0.c
> @@ -395,8 +395,7 @@ static int raid0_run(mddev_t *mddev)
>
> blk_queue_merge_bvec(mddev->queue, raid0_mergeable_bvec);
> dump_zones(mddev);
> - md_integrity_register(mddev);
> - return 0;
> + return md_integrity_register(mddev);
> }
>
> static int raid0_stop(mddev_t *mddev)
> diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
> index 06cd712..1cca285 100644
> --- a/drivers/md/raid1.c
> +++ b/drivers/md/raid1.c
> @@ -1178,7 +1178,7 @@ static int raid1_remove_disk(mddev_t *mddev, int number)
> p->rdev = rdev;
> goto abort;
> }
> - md_integrity_register(mddev);
> + err = md_integrity_register(mddev);
> }
> abort:
>
> @@ -2069,8 +2069,7 @@ static int run(mddev_t *mddev)
> mddev->queue->unplug_fn = raid1_unplug;
> mddev->queue->backing_dev_info.congested_fn = raid1_congested;
> mddev->queue->backing_dev_info.congested_data = mddev;
> - md_integrity_register(mddev);
> - return 0;
> + return md_integrity_register(mddev);
> }
>
> static int stop(mddev_t *mddev)
> diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
> index 747d061..17a2891 100644
> --- a/drivers/md/raid10.c
> +++ b/drivers/md/raid10.c
> @@ -1233,7 +1233,7 @@ static int raid10_remove_disk(mddev_t *mddev, int number)
> p->rdev = rdev;
> goto abort;
> }
> - md_integrity_register(mddev);
> + err = md_integrity_register(mddev);
> }
> abort:
>
> @@ -2395,7 +2395,10 @@ static int run(mddev_t *mddev)
>
> if (conf->near_copies < conf->raid_disks)
> blk_queue_merge_bvec(mddev->queue, raid10_mergeable_bvec);
> - md_integrity_register(mddev);
> +
> + if (md_integrity_register(mddev))
> + goto out_free_conf;
> +
> return 0;
>
> out_free_conf:
> diff --git a/fs/bio-integrity.c b/fs/bio-integrity.c
> index e49cce2..9c5e6b2 100644
> --- a/fs/bio-integrity.c
> +++ b/fs/bio-integrity.c
> @@ -761,6 +761,9 @@ int bioset_integrity_create(struct bio_set *bs, int pool_size)
> {
> unsigned int max_slab = vecs_to_idx(BIO_MAX_PAGES);
>
> + if (bs->bio_integrity_pool)
> + return 0;
> +
> bs->bio_integrity_pool =
> mempool_create_slab_pool(pool_size, bip_slab[max_slab].slab);
>
> diff --git a/fs/bio.c b/fs/bio.c
> index 5694b75..85e2eab 100644
> --- a/fs/bio.c
> +++ b/fs/bio.c
> @@ -1636,9 +1636,6 @@ struct bio_set *bioset_create(unsigned int pool_size, unsigned int front_pad)
> if (!bs->bio_pool)
> goto bad;
>
> - if (bioset_integrity_create(bs, pool_size))
> - goto bad;
> -
> if (!biovec_create_pools(bs, pool_size))
> return bs;
>
> @@ -1682,6 +1679,9 @@ static int __init init_bio(void)
> if (!fs_bio_set)
> panic("bio: can't allocate bios
");
>
> + if (bioset_integrity_create(fs_bio_set, BIO_POOL_SIZE))
> + panic("bio: can't create integrity pool
");
> +
> bio_split_pool = mempool_create_kmalloc_pool(BIO_SPLIT_ENTRIES,
> sizeof(struct bio_pair));
> if (!bio_split_pool)
>
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel

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