Hi Martin, Jens, Alasdair,
I found this commit (6d2a78e783416ba99e36beb1d4395b785b34e867) in the recent
Linus's git makes every block device share single mempool for integrity cloning.
I think that it avoids integrity support for dm, because having only one mempool
in the kernel may cause a deadlock due to no memory while a bio goes down to
a device stack.
So dm needs to prepare own mempool for each device and pass it to
bio_integrity_clone() instead of the shared one.
commit 6d2a78e783416ba99e36beb1d4395b785b34e867
Author: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Date: Tue Mar 10 08:27:39 2009 +0100
block: add private bio_set for bio integrity allocations
The integrity bio allocation needs its own bio_set to avoid violating
the mempool allocation rules and risking deadlocks.
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Jens Axboe <jens.axboe@xxxxxxxxxx>
diff --git a/fs/bio-integrity.c b/fs/bio-integrity.c
index fe2b1aa..31c46a2 100644
--- a/fs/bio-integrity.c
+++ b/fs/bio-integrity.c
@@ -26,23 +26,23 @@
#include <linux/workqueue.h>
static struct kmem_cache *bio_integrity_slab __read_mostly;
+static mempool_t *bio_integrity_pool;
+static struct bio_set *integrity_bio_set;
static struct workqueue_struct *kintegrityd_wq;
/**
- * bio_integrity_alloc_bioset - Allocate integrity payload and attach it to bio
+ * bio_integrity_alloc - Allocate integrity payload and attach it to bio
* @bio: bio to attach integrity metadata to
* @gfp_mask: Memory allocation mask
* @nr_vecs: Number of integrity metadata scatter-gather elements
- * @bs: bio_set to allocate from
*
* Description: This function prepares a bio for attaching integrity
* metadata. nr_vecs specifies the maximum number of pages containing
* integrity metadata that can be attached.
*/
-struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *bio,
- gfp_t gfp_mask,
- unsigned int nr_vecs,
- struct bio_set *bs)
+struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio,
+ gfp_t gfp_mask,
+ unsigned int nr_vecs)
{
struct bio_integrity_payload *bip;
struct bio_vec *iv;
@@ -50,7 +50,7 @@ struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *bio,
BUG_ON(bio == NULL);
- bip = mempool_alloc(bs->bio_integrity_pool, gfp_mask);
+ bip = mempool_alloc(bio_integrity_pool, gfp_mask);
if (unlikely(bip == NULL)) {
printk(KERN_ERR "%s: could not alloc bip\n", __func__);
return NULL;
@@ -58,10 +58,10 @@ struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *bio,
memset(bip, 0, sizeof(*bip));
- iv = bvec_alloc_bs(gfp_mask, nr_vecs, &idx, bs);
+ iv = bvec_alloc_bs(gfp_mask, nr_vecs, &idx, integrity_bio_set);
if (unlikely(iv == NULL)) {
printk(KERN_ERR "%s: could not alloc bip_vec\n", __func__);
- mempool_free(bip, bs->bio_integrity_pool);
+ mempool_free(bip, bio_integrity_pool);
return NULL;
}
@@ -72,35 +72,16 @@ struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *bio,
return bip;
}
-EXPORT_SYMBOL(bio_integrity_alloc_bioset);
-
-/**
- * bio_integrity_alloc - Allocate integrity payload and attach it to bio
- * @bio: bio to attach integrity metadata to
- * @gfp_mask: Memory allocation mask
- * @nr_vecs: Number of integrity metadata scatter-gather elements
- *
- * Description: This function prepares a bio for attaching integrity
- * metadata. nr_vecs specifies the maximum number of pages containing
- * integrity metadata that can be attached.
- */
-struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio,
- gfp_t gfp_mask,
- unsigned int nr_vecs)
-{
- return bio_integrity_alloc_bioset(bio, gfp_mask, nr_vecs, fs_bio_set);
-}
EXPORT_SYMBOL(bio_integrity_alloc);
/**
* bio_integrity_free - Free bio integrity payload
* @bio: bio containing bip to be freed
- * @bs: bio_set this bio was allocated from
*
* Description: Used to free the integrity portion of a bio. Usually
* called from bio_free().
*/
-void bio_integrity_free(struct bio *bio, struct bio_set *bs)
+void bio_integrity_free(struct bio *bio)
{
struct bio_integrity_payload *bip = bio->bi_integrity;
@@ -111,8 +92,8 @@ void bio_integrity_free(struct bio *bio, struct bio_set *bs)
&& bip->bip_buf != NULL)
kfree(bip->bip_buf);
- bvec_free_bs(bs, bip->bip_vec, bip->bip_pool);
- mempool_free(bip, bs->bio_integrity_pool);
+ bvec_free_bs(integrity_bio_set, bip->bip_vec, bip->bip_pool);
+ mempool_free(bip, bio_integrity_pool);
bio->bi_integrity = NULL;
}
@@ -686,19 +667,17 @@ EXPORT_SYMBOL(bio_integrity_split);
* @bio: New bio
* @bio_src: Original bio
* @gfp_mask: Memory allocation mask
- * @bs: bio_set to allocate bip from
*
* Description: Called to allocate a bip when cloning a bio
*/
-int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
- gfp_t gfp_mask, struct bio_set *bs)
+int bio_integrity_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp_mask)
{
struct bio_integrity_payload *bip_src = bio_src->bi_integrity;
struct bio_integrity_payload *bip;
BUG_ON(bip_src == NULL);
- bip = bio_integrity_alloc_bioset(bio, gfp_mask, bip_src->bip_vcnt, bs);
+ bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt);
if (bip == NULL)
return -EIO;
@@ -714,37 +693,25 @@ int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
}
EXPORT_SYMBOL(bio_integrity_clone);
-int bioset_integrity_create(struct bio_set *bs, int pool_size)
+static int __init bio_integrity_init(void)
{
- bs->bio_integrity_pool = mempool_create_slab_pool(pool_size,
- bio_integrity_slab);
- if (!bs->bio_integrity_pool)
- return -1;
-
- return 0;
-}
-EXPORT_SYMBOL(bioset_integrity_create);
+ kintegrityd_wq = create_workqueue("kintegrityd");
-void bioset_integrity_free(struct bio_set *bs)
-{
- if (bs->bio_integrity_pool)
- mempool_destroy(bs->bio_integrity_pool);
-}
-EXPORT_SYMBOL(bioset_integrity_free);
+ if (!kintegrityd_wq)
+ panic("Failed to create kintegrityd\n");
-void __init bio_integrity_init_slab(void)
-{
bio_integrity_slab = KMEM_CACHE(bio_integrity_payload,
SLAB_HWCACHE_ALIGN|SLAB_PANIC);
-}
-static int __init integrity_init(void)
-{
- kintegrityd_wq = create_workqueue("kintegrityd");
+ bio_integrity_pool = mempool_create_slab_pool(BIO_POOL_SIZE,
+ bio_integrity_slab);
+ if (!bio_integrity_pool)
+ panic("bio_integrity: can't allocate bip pool\n");
- if (!kintegrityd_wq)
- panic("Failed to create kintegrityd\n");
+ integrity_bio_set = bioset_create(BIO_POOL_SIZE, 0);
+ if (!integrity_bio_set)
+ panic("bio_integrity: can't allocate bio_set\n");
return 0;
}
-subsys_initcall(integrity_init);
+subsys_initcall(bio_integrity_init);
diff --git a/fs/bio.c b/fs/bio.c
index 9cc1430..a040cde 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -248,7 +248,7 @@ void bio_free(struct bio *bio, struct bio_set *bs)
bvec_free_bs(bs, bio->bi_io_vec, BIO_POOL_IDX(bio));
if (bio_integrity(bio))
- bio_integrity_free(bio, bs);
+ bio_integrity_free(bio);
/*
* If we have front padding, adjust the bio pointer before freeing
@@ -466,7 +466,7 @@ struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
if (bio_integrity(bio)) {
int ret;
- ret = bio_integrity_clone(b, bio, gfp_mask, fs_bio_set);
+ ret = bio_integrity_clone(b, bio, gfp_mask);
if (ret < 0) {
bio_put(b);
@@ -1529,7 +1529,6 @@ void bioset_free(struct bio_set *bs)
if (bs->bio_pool)
mempool_destroy(bs->bio_pool);
- bioset_integrity_free(bs);
biovec_free_pools(bs);
bio_put_slab(bs);
@@ -1570,9 +1569,6 @@ 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;
@@ -1610,7 +1606,6 @@ static int __init init_bio(void)
if (!bio_slabs)
panic("bio: can't allocate bios\n");
- bio_integrity_init_slab();
biovec_init_slabs();
fs_bio_set = bioset_create(BIO_POOL_SIZE, 0);
diff --git a/include/linux/bio.h b/include/linux/bio.h
index d8bd43b..b05b1d4 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -426,9 +426,6 @@ struct bio_set {
unsigned int front_pad;
mempool_t *bio_pool;
-#if defined(CONFIG_BLK_DEV_INTEGRITY)
- mempool_t *bio_integrity_pool;
-#endif
mempool_t *bvec_pool;
};
@@ -519,9 +516,8 @@ static inline int bio_has_data(struct bio *bio)
#define bio_integrity(bio) (bio->bi_integrity != NULL)
-extern struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *, gfp_t, unsigned int, struct bio_set *);
extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);
-extern void bio_integrity_free(struct bio *, struct bio_set *);
+extern void bio_integrity_free(struct bio *);
extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);
extern int bio_integrity_enabled(struct bio *bio);
extern int bio_integrity_set_tag(struct bio *, void *, unsigned int);
@@ -531,27 +527,21 @@ extern void bio_integrity_endio(struct bio *, int);
extern void bio_integrity_advance(struct bio *, unsigned int);
extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
extern void bio_integrity_split(struct bio *, struct bio_pair *, int);
-extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t, struct bio_set *);
-extern int bioset_integrity_create(struct bio_set *, int);
-extern void bioset_integrity_free(struct bio_set *);
-extern void bio_integrity_init_slab(void);
+extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t);
#else /* CONFIG_BLK_DEV_INTEGRITY */
#define bio_integrity(a) (0)
-#define bioset_integrity_create(a, b) (0)
#define bio_integrity_prep(a) (0)
#define bio_integrity_enabled(a) (0)
-#define bio_integrity_clone(a, b, c,d ) (0)
-#define bioset_integrity_free(a) do { } while (0)
-#define bio_integrity_free(a, b) do { } while (0)
+#define bio_integrity_clone(a, b, c) (0)
+#define bio_integrity_free(a) do { } while (0)
#define bio_integrity_endio(a, b) do { } while (0)
#define bio_integrity_advance(a, b) do { } while (0)
#define bio_integrity_trim(a, b, c) do { } while (0)
#define bio_integrity_split(a, b, c) do { } while (0)
#define bio_integrity_set_tag(a, b, c) do { } while (0)
#define bio_integrity_get_tag(a, b, c) do { } while (0)
-#define bio_integrity_init_slab(a) do { } while (0)
#endif /* CONFIG_BLK_DEV_INTEGRITY */
Thanks,
Kiyoshi Ueda
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