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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@oracle.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Martin K. Petersen
Jens Axboe
parent
32ca163c9c
commit
6d2a78e783
3 changed files with 54 additions and 102 deletions
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@ -26,54 +26,10 @@
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#include <linux/workqueue.h>
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static struct kmem_cache *bio_integrity_slab __read_mostly;
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static mempool_t *bio_integrity_pool;
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static struct bio_set *integrity_bio_set;
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static struct workqueue_struct *kintegrityd_wq;
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/**
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* bio_integrity_alloc_bioset - Allocate integrity payload and attach it to bio
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* @bio: bio to attach integrity metadata to
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* @gfp_mask: Memory allocation mask
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* @nr_vecs: Number of integrity metadata scatter-gather elements
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* @bs: bio_set to allocate from
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*
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* Description: This function prepares a bio for attaching integrity
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* metadata. nr_vecs specifies the maximum number of pages containing
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* integrity metadata that can be attached.
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*/
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struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *bio,
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gfp_t gfp_mask,
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unsigned int nr_vecs,
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struct bio_set *bs)
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{
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struct bio_integrity_payload *bip;
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struct bio_vec *iv;
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unsigned long idx;
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BUG_ON(bio == NULL);
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bip = mempool_alloc(bs->bio_integrity_pool, gfp_mask);
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if (unlikely(bip == NULL)) {
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printk(KERN_ERR "%s: could not alloc bip\n", __func__);
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return NULL;
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}
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memset(bip, 0, sizeof(*bip));
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iv = bvec_alloc_bs(gfp_mask, nr_vecs, &idx, bs);
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if (unlikely(iv == NULL)) {
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printk(KERN_ERR "%s: could not alloc bip_vec\n", __func__);
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mempool_free(bip, bs->bio_integrity_pool);
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return NULL;
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}
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bip->bip_pool = idx;
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bip->bip_vec = iv;
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bip->bip_bio = bio;
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bio->bi_integrity = bip;
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return bip;
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}
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EXPORT_SYMBOL(bio_integrity_alloc_bioset);
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/**
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* bio_integrity_alloc - Allocate integrity payload and attach it to bio
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* @bio: bio to attach integrity metadata to
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@ -88,19 +44,44 @@ struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio,
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gfp_t gfp_mask,
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unsigned int nr_vecs)
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{
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return bio_integrity_alloc_bioset(bio, gfp_mask, nr_vecs, fs_bio_set);
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struct bio_integrity_payload *bip;
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struct bio_vec *iv;
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unsigned long idx;
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BUG_ON(bio == NULL);
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bip = mempool_alloc(bio_integrity_pool, gfp_mask);
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if (unlikely(bip == NULL)) {
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printk(KERN_ERR "%s: could not alloc bip\n", __func__);
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return NULL;
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}
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memset(bip, 0, sizeof(*bip));
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iv = bvec_alloc_bs(gfp_mask, nr_vecs, &idx, integrity_bio_set);
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if (unlikely(iv == NULL)) {
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printk(KERN_ERR "%s: could not alloc bip_vec\n", __func__);
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mempool_free(bip, bio_integrity_pool);
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return NULL;
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}
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bip->bip_pool = idx;
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bip->bip_vec = iv;
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bip->bip_bio = bio;
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bio->bi_integrity = bip;
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return bip;
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}
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EXPORT_SYMBOL(bio_integrity_alloc);
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/**
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* bio_integrity_free - Free bio integrity payload
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* @bio: bio containing bip to be freed
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* @bs: bio_set this bio was allocated from
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*
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* Description: Used to free the integrity portion of a bio. Usually
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* called from bio_free().
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*/
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void bio_integrity_free(struct bio *bio, struct bio_set *bs)
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void bio_integrity_free(struct bio *bio)
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{
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struct bio_integrity_payload *bip = bio->bi_integrity;
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@ -111,8 +92,8 @@ void bio_integrity_free(struct bio *bio, struct bio_set *bs)
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&& bip->bip_buf != NULL)
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kfree(bip->bip_buf);
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bvec_free_bs(bs, bip->bip_vec, bip->bip_pool);
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mempool_free(bip, bs->bio_integrity_pool);
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bvec_free_bs(integrity_bio_set, bip->bip_vec, bip->bip_pool);
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mempool_free(bip, bio_integrity_pool);
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bio->bi_integrity = NULL;
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}
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@ -686,19 +667,17 @@ EXPORT_SYMBOL(bio_integrity_split);
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* @bio: New bio
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* @bio_src: Original bio
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* @gfp_mask: Memory allocation mask
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* @bs: bio_set to allocate bip from
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*
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* Description: Called to allocate a bip when cloning a bio
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*/
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int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
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gfp_t gfp_mask, struct bio_set *bs)
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int bio_integrity_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp_mask)
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{
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struct bio_integrity_payload *bip_src = bio_src->bi_integrity;
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struct bio_integrity_payload *bip;
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BUG_ON(bip_src == NULL);
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bip = bio_integrity_alloc_bioset(bio, gfp_mask, bip_src->bip_vcnt, bs);
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bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt);
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if (bip == NULL)
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return -EIO;
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@ -714,37 +693,25 @@ int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
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}
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EXPORT_SYMBOL(bio_integrity_clone);
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int bioset_integrity_create(struct bio_set *bs, int pool_size)
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{
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bs->bio_integrity_pool = mempool_create_slab_pool(pool_size,
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bio_integrity_slab);
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if (!bs->bio_integrity_pool)
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return -1;
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return 0;
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}
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EXPORT_SYMBOL(bioset_integrity_create);
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void bioset_integrity_free(struct bio_set *bs)
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{
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if (bs->bio_integrity_pool)
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mempool_destroy(bs->bio_integrity_pool);
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}
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EXPORT_SYMBOL(bioset_integrity_free);
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void __init bio_integrity_init_slab(void)
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{
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bio_integrity_slab = KMEM_CACHE(bio_integrity_payload,
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SLAB_HWCACHE_ALIGN|SLAB_PANIC);
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}
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static int __init integrity_init(void)
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static int __init bio_integrity_init(void)
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{
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kintegrityd_wq = create_workqueue("kintegrityd");
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if (!kintegrityd_wq)
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panic("Failed to create kintegrityd\n");
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bio_integrity_slab = KMEM_CACHE(bio_integrity_payload,
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SLAB_HWCACHE_ALIGN|SLAB_PANIC);
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bio_integrity_pool = mempool_create_slab_pool(BIO_POOL_SIZE,
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bio_integrity_slab);
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if (!bio_integrity_pool)
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panic("bio_integrity: can't allocate bip pool\n");
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integrity_bio_set = bioset_create(BIO_POOL_SIZE, 0);
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if (!integrity_bio_set)
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panic("bio_integrity: can't allocate bio_set\n");
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return 0;
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}
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subsys_initcall(integrity_init);
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subsys_initcall(bio_integrity_init);
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9
fs/bio.c
9
fs/bio.c
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@ -248,7 +248,7 @@ void bio_free(struct bio *bio, struct bio_set *bs)
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bvec_free_bs(bs, bio->bi_io_vec, BIO_POOL_IDX(bio));
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if (bio_integrity(bio))
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bio_integrity_free(bio, bs);
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bio_integrity_free(bio);
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/*
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* If we have front padding, adjust the bio pointer before freeing
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@ -466,7 +466,7 @@ struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
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if (bio_integrity(bio)) {
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int ret;
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ret = bio_integrity_clone(b, bio, gfp_mask, fs_bio_set);
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ret = bio_integrity_clone(b, bio, gfp_mask);
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if (ret < 0) {
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bio_put(b);
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@ -1529,7 +1529,6 @@ void bioset_free(struct bio_set *bs)
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if (bs->bio_pool)
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mempool_destroy(bs->bio_pool);
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bioset_integrity_free(bs);
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biovec_free_pools(bs);
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bio_put_slab(bs);
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@ -1570,9 +1569,6 @@ struct bio_set *bioset_create(unsigned int pool_size, unsigned int front_pad)
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if (!bs->bio_pool)
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goto bad;
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if (bioset_integrity_create(bs, pool_size))
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goto bad;
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if (!biovec_create_pools(bs, pool_size))
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return bs;
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@ -1610,7 +1606,6 @@ static int __init init_bio(void)
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if (!bio_slabs)
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panic("bio: can't allocate bios\n");
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bio_integrity_init_slab();
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biovec_init_slabs();
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fs_bio_set = bioset_create(BIO_POOL_SIZE, 0);
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@ -426,9 +426,6 @@ struct bio_set {
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unsigned int front_pad;
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mempool_t *bio_pool;
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#if defined(CONFIG_BLK_DEV_INTEGRITY)
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mempool_t *bio_integrity_pool;
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#endif
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mempool_t *bvec_pool;
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};
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@ -519,9 +516,8 @@ static inline int bio_has_data(struct bio *bio)
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#define bio_integrity(bio) (bio->bi_integrity != NULL)
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extern struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *, gfp_t, unsigned int, struct bio_set *);
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extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);
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extern void bio_integrity_free(struct bio *, struct bio_set *);
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extern void bio_integrity_free(struct bio *);
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extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);
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extern int bio_integrity_enabled(struct bio *bio);
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extern int bio_integrity_set_tag(struct bio *, void *, unsigned int);
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@ -531,27 +527,21 @@ extern void bio_integrity_endio(struct bio *, int);
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extern void bio_integrity_advance(struct bio *, unsigned int);
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extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
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extern void bio_integrity_split(struct bio *, struct bio_pair *, int);
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extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t, struct bio_set *);
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extern int bioset_integrity_create(struct bio_set *, int);
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extern void bioset_integrity_free(struct bio_set *);
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extern void bio_integrity_init_slab(void);
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extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t);
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#else /* CONFIG_BLK_DEV_INTEGRITY */
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#define bio_integrity(a) (0)
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#define bioset_integrity_create(a, b) (0)
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#define bio_integrity_prep(a) (0)
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#define bio_integrity_enabled(a) (0)
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#define bio_integrity_clone(a, b, c,d ) (0)
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#define bioset_integrity_free(a) do { } while (0)
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#define bio_integrity_free(a, b) do { } while (0)
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#define bio_integrity_clone(a, b, c) (0)
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#define bio_integrity_free(a) do { } while (0)
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#define bio_integrity_endio(a, b) do { } while (0)
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#define bio_integrity_advance(a, b) do { } while (0)
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#define bio_integrity_trim(a, b, c) do { } while (0)
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#define bio_integrity_split(a, b, c) do { } while (0)
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#define bio_integrity_set_tag(a, b, c) do { } while (0)
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#define bio_integrity_get_tag(a, b, c) do { } while (0)
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#define bio_integrity_init_slab(a) do { } while (0)
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#endif /* CONFIG_BLK_DEV_INTEGRITY */
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