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authorMikulas Patocka <mpatocka@redhat.com>2014-03-28 15:51:55 -0400
committerMike Snitzer <snitzer@redhat.com>2014-08-01 12:30:34 -0400
commit6a2414836154dc22b224c837ad7b862f78d595d1 (patch)
tree35affb2fa0fa07f9d0639f7e884e00ba2e237faf /block
parenta7ffb6a53391c2690263675f13c79a273301d2b3 (diff)
downloadop-kernel-dev-6a2414836154dc22b224c837ad7b862f78d595d1.zip
op-kernel-dev-6a2414836154dc22b224c837ad7b862f78d595d1.tar.gz
block: use kmalloc alignment for bio slab
Various subsystems can ask the bio subsystem to create a bio slab cache with some free space before the bio. This free space can be used for any purpose. Device mapper uses this per-bio-data feature to place some target-specific and device-mapper specific data before the bio, so that the target-specific data doesn't have to be allocated separately. This per-bio-data mechanism is used in place of kmalloc, so we need the allocated slab to have the same memory alignment as memory allocated with kmalloc. Change bio_find_or_create_slab() so that it uses ARCH_KMALLOC_MINALIGN alignment when creating the slab cache. This is needed so that dm-crypt can use per-bio-data for encryption - the crypto subsystem assumes this data will have the same alignment as kmalloc'ed memory. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Acked-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
-rw-r--r--block/bio.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/block/bio.c b/block/bio.c
index 0ec61c9..3e6331d 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -112,7 +112,8 @@ static struct kmem_cache *bio_find_or_create_slab(unsigned int extra_size)
bslab = &bio_slabs[entry];
snprintf(bslab->name, sizeof(bslab->name), "bio-%d", entry);
- slab = kmem_cache_create(bslab->name, sz, 0, SLAB_HWCACHE_ALIGN, NULL);
+ slab = kmem_cache_create(bslab->name, sz, ARCH_KMALLOC_MINALIGN,
+ SLAB_HWCACHE_ALIGN, NULL);
if (!slab)
goto out_unlock;
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