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authorMike Snitzer <snitzer@redhat.com>2015-06-26 16:42:57 +0300
committerMike Snitzer <snitzer@redhat.com>2015-06-26 17:11:07 +0300
commit4e6e36c3714364b65f2bfea8c73691c663891726 (patch)
treee5fd2763c7d873bf70457e447922060dd8446223 /drivers/md
parente262f34741522e0d821642e5449c6eeb512723fc (diff)
downloadlinux-4e6e36c3714364b65f2bfea8c73691c663891726.tar.xz
Revert "dm: do not allocate any mempools for blk-mq request-based DM"
This reverts commit cbc4e3c1350beb47beab8f34ad9be3d34a20c705. Reported-by: Junichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-table.c4
-rw-r--r--drivers/md/dm.c69
2 files changed, 33 insertions, 40 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 85e1d39e9a38..a5f94125ad01 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -964,8 +964,8 @@ static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *
return -EINVAL;
}
- if (IS_ERR(t->mempools))
- return PTR_ERR(t->mempools);
+ if (!t->mempools)
+ return -ENOMEM;
return 0;
}
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 90dc49e3c78f..492181e16c69 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2349,52 +2349,39 @@ static void free_dev(struct mapped_device *md)
kfree(md);
}
-static unsigned filter_md_type(unsigned type, struct mapped_device *md)
-{
- if (type == DM_TYPE_BIO_BASED)
- return type;
-
- return !md->use_blk_mq ? DM_TYPE_REQUEST_BASED : DM_TYPE_MQ_REQUEST_BASED;
-}
-
static void __bind_mempools(struct mapped_device *md, struct dm_table *t)
{
struct dm_md_mempools *p = dm_table_get_md_mempools(t);
- switch (filter_md_type(dm_table_get_type(t), md)) {
- case DM_TYPE_BIO_BASED:
- if (md->bs && md->io_pool) {
+ if (md->bs) {
+ /* The md already has necessary mempools. */
+ if (dm_table_get_type(t) == DM_TYPE_BIO_BASED) {
/*
- * This bio-based md already has necessary mempools.
* Reload bioset because front_pad may have changed
* because a different table was loaded.
*/
bioset_free(md->bs);
md->bs = p->bs;
p->bs = NULL;
- goto out;
}
- break;
- case DM_TYPE_REQUEST_BASED:
- if (md->rq_pool && md->io_pool)
- /*
- * This request-based md already has necessary mempools.
- */
- goto out;
- break;
- case DM_TYPE_MQ_REQUEST_BASED:
- BUG_ON(p); /* No mempools needed */
- return;
+ /*
+ * There's no need to reload with request-based dm
+ * because the size of front_pad doesn't change.
+ * Note for future: If you are to reload bioset,
+ * prep-ed requests in the queue may refer
+ * to bio from the old bioset, so you must walk
+ * through the queue to unprep.
+ */
+ goto out;
}
- BUG_ON(!p || md->io_pool || md->rq_pool || md->bs);
-
md->io_pool = p->io_pool;
p->io_pool = NULL;
md->rq_pool = p->rq_pool;
p->rq_pool = NULL;
md->bs = p->bs;
p->bs = NULL;
+
out:
/* mempool bind completed, no longer need any mempools in the table */
dm_table_free_md_mempools(t);
@@ -2774,6 +2761,14 @@ out_tag_set:
return err;
}
+static unsigned filter_md_type(unsigned type, struct mapped_device *md)
+{
+ if (type == DM_TYPE_BIO_BASED)
+ return type;
+
+ return !md->use_blk_mq ? DM_TYPE_REQUEST_BASED : DM_TYPE_MQ_REQUEST_BASED;
+}
+
/*
* Setup the DM device's queue based on md's type
*/
@@ -3495,7 +3490,7 @@ struct dm_md_mempools *dm_alloc_bio_mempools(unsigned integrity,
pools = kzalloc(sizeof(*pools), GFP_KERNEL);
if (!pools)
- return ERR_PTR(-ENOMEM);
+ return NULL;
front_pad = roundup(per_bio_data_size, __alignof__(struct dm_target_io)) +
offsetof(struct dm_target_io, clone);
@@ -3514,26 +3509,24 @@ struct dm_md_mempools *dm_alloc_bio_mempools(unsigned integrity,
return pools;
out:
dm_free_md_mempools(pools);
- return ERR_PTR(-ENOMEM);
+ return NULL;
}
struct dm_md_mempools *dm_alloc_rq_mempools(struct mapped_device *md,
unsigned type)
{
- unsigned int pool_size;
+ unsigned int pool_size = dm_get_reserved_rq_based_ios();
struct dm_md_mempools *pools;
- if (filter_md_type(type, md) == DM_TYPE_MQ_REQUEST_BASED)
- return NULL; /* No mempools needed */
-
- pool_size = dm_get_reserved_rq_based_ios();
pools = kzalloc(sizeof(*pools), GFP_KERNEL);
if (!pools)
- return ERR_PTR(-ENOMEM);
+ return NULL;
- pools->rq_pool = mempool_create_slab_pool(pool_size, _rq_cache);
- if (!pools->rq_pool)
- goto out;
+ if (filter_md_type(type, md) == DM_TYPE_REQUEST_BASED) {
+ pools->rq_pool = mempool_create_slab_pool(pool_size, _rq_cache);
+ if (!pools->rq_pool)
+ goto out;
+ }
pools->io_pool = mempool_create_slab_pool(pool_size, _rq_tio_cache);
if (!pools->io_pool)
@@ -3542,7 +3535,7 @@ struct dm_md_mempools *dm_alloc_rq_mempools(struct mapped_device *md,
return pools;
out:
dm_free_md_mempools(pools);
- return ERR_PTR(-ENOMEM);
+ return NULL;
}
void dm_free_md_mempools(struct dm_md_mempools *pools)