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block: Create bip slabs with embedded integrity vectors
This patch restores stacking ability to the block layer integrity infrastructure by creating a set of dedicated bip slabs. Each bip slab has an embedded bio_vec array at the end. This cuts down on memory allocations and also simplifies the code compared to the original bvec version. Only the largest bip slab is backed by a mempool. The pool is contained in the bio_set so stacking drivers can ensure forward progress. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <axboe@carl.(none)>
This commit is contained in:
Martin K. Petersen
Jens Axboe
parent
6118b70b3a
commit
7878cba9f0
5 changed files with 162 additions and 67 deletions
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@ -2365,7 +2365,7 @@ int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
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__bio_clone(bio, bio_src);
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if (bio_integrity(bio_src) &&
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bio_integrity_clone(bio, bio_src, gfp_mask))
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bio_integrity_clone(bio, bio_src, gfp_mask, bs))
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goto free_and_out;
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if (bio_ctr && bio_ctr(bio, bio_src, data))
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@ -1017,7 +1017,7 @@ static struct bio *split_bvec(struct bio *bio, sector_t sector,
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clone->bi_flags |= 1 << BIO_CLONED;
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if (bio_integrity(bio)) {
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bio_integrity_clone(clone, bio, GFP_NOIO);
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bio_integrity_clone(clone, bio, GFP_NOIO, bs);
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bio_integrity_trim(clone,
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bio_sector_offset(bio, idx, offset), len);
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}
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@ -1045,7 +1045,7 @@ static struct bio *clone_bio(struct bio *bio, sector_t sector,
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clone->bi_flags &= ~(1 << BIO_SEG_VALID);
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if (bio_integrity(bio)) {
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bio_integrity_clone(clone, bio, GFP_NOIO);
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bio_integrity_clone(clone, bio, GFP_NOIO, bs);
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if (idx != bio->bi_idx || clone->bi_size < bio->bi_size)
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bio_integrity_trim(clone,
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@ -1,7 +1,7 @@
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/*
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* bio-integrity.c - bio data integrity extensions
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*
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* Copyright (C) 2007, 2008 Oracle Corporation
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* Copyright (C) 2007, 2008, 2009 Oracle Corporation
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* Written by: Martin K. Petersen <martin.petersen@oracle.com>
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*
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* This program is free software; you can redistribute it and/or
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@ -25,11 +25,94 @@
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#include <linux/bio.h>
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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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struct integrity_slab {
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struct kmem_cache *slab;
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unsigned short nr_vecs;
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char name[8];
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};
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#define IS(x) { .nr_vecs = x, .name = "bip-"__stringify(x) }
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struct integrity_slab bip_slab[BIOVEC_NR_POOLS] __read_mostly = {
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IS(1), IS(4), IS(16), IS(64), IS(128), IS(BIO_MAX_PAGES),
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};
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#undef IS
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static struct workqueue_struct *kintegrityd_wq;
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static inline unsigned int vecs_to_idx(unsigned int nr)
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{
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switch (nr) {
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case 1:
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return 0;
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case 2 ... 4:
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return 1;
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case 5 ... 16:
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return 2;
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case 17 ... 64:
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return 3;
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case 65 ... 128:
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return 4;
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case 129 ... BIO_MAX_PAGES:
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return 5;
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default:
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BUG();
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}
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}
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static inline int use_bip_pool(unsigned int idx)
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{
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if (idx == BIOVEC_NR_POOLS)
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return 1;
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return 0;
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}
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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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unsigned int idx = vecs_to_idx(nr_vecs);
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BUG_ON(bio == NULL);
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bip = NULL;
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/* Lower order allocations come straight from slab */
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if (!use_bip_pool(idx))
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bip = kmem_cache_alloc(bip_slab[idx].slab, gfp_mask);
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/* Use mempool if lower order alloc failed or max vecs were requested */
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if (bip == 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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}
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memset(bip, 0, sizeof(*bip));
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bip->bip_slab = idx;
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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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@ -44,44 +127,19 @@ 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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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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return bio_integrity_alloc_bioset(bio, gfp_mask, nr_vecs, fs_bio_set);
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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)
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void bio_integrity_free(struct bio *bio, struct bio_set *bs)
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{
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struct bio_integrity_payload *bip = bio->bi_integrity;
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@ -92,8 +150,10 @@ void bio_integrity_free(struct bio *bio)
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&& bip->bip_buf != NULL)
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kfree(bip->bip_buf);
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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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if (use_bip_pool(bip->bip_slab))
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mempool_free(bip, bs->bio_integrity_pool);
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else
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kmem_cache_free(bip_slab[bip->bip_slab].slab, bip);
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bio->bi_integrity = NULL;
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}
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@ -114,7 +174,7 @@ int bio_integrity_add_page(struct bio *bio, struct page *page,
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struct bio_integrity_payload *bip = bio->bi_integrity;
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struct bio_vec *iv;
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if (bip->bip_vcnt >= bvec_nr_vecs(bip->bip_pool)) {
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if (bip->bip_vcnt >= bvec_nr_vecs(bip->bip_slab)) {
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printk(KERN_ERR "%s: bip_vec full\n", __func__);
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return 0;
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}
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@ -647,8 +707,8 @@ void bio_integrity_split(struct bio *bio, struct bio_pair *bp, int sectors)
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bp->iv1 = bip->bip_vec[0];
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bp->iv2 = bip->bip_vec[0];
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bp->bip1.bip_vec = &bp->iv1;
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bp->bip2.bip_vec = &bp->iv2;
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bp->bip1.bip_vec[0] = bp->iv1;
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bp->bip2.bip_vec[0] = bp->iv2;
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bp->iv1.bv_len = sectors * bi->tuple_size;
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bp->iv2.bv_offset += sectors * bi->tuple_size;
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@ -667,17 +727,19 @@ 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, gfp_t gfp_mask)
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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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{
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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(bio, gfp_mask, bip_src->bip_vcnt);
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bip = bio_integrity_alloc_bioset(bio, gfp_mask, bip_src->bip_vcnt, bs);
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if (bip == NULL)
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return -EIO;
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@ -693,25 +755,43 @@ int bio_integrity_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp_mask)
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}
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EXPORT_SYMBOL(bio_integrity_clone);
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static int __init bio_integrity_init(void)
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int bioset_integrity_create(struct bio_set *bs, int pool_size)
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{
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kintegrityd_wq = create_workqueue("kintegrityd");
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unsigned int max_slab = vecs_to_idx(BIO_MAX_PAGES);
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if (!kintegrityd_wq)
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panic("Failed to create kintegrityd\n");
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bs->bio_integrity_pool =
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mempool_create_slab_pool(pool_size, bip_slab[max_slab].slab);
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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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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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subsys_initcall(bio_integrity_init);
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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(void)
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{
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unsigned int i;
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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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for (i = 0 ; i < BIOVEC_NR_POOLS ; i++) {
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unsigned int size;
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size = sizeof(struct bio_integrity_payload)
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+ bip_slab[i].nr_vecs * sizeof(struct bio_vec);
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bip_slab[i].slab =
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kmem_cache_create(bip_slab[i].name, size, 0,
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SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
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}
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}
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11
fs/bio.c
11
fs/bio.c
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@ -238,7 +238,7 @@ 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);
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bio_integrity_free(bio, bs);
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/*
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* If we have front padding, adjust the bio pointer before freeing
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@ -341,7 +341,7 @@ struct bio *bio_alloc(gfp_t gfp_mask, int nr_iovecs)
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static void bio_kmalloc_destructor(struct bio *bio)
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{
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if (bio_integrity(bio))
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bio_integrity_free(bio);
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bio_integrity_free(bio, fs_bio_set);
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kfree(bio);
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}
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@ -472,7 +472,7 @@ 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);
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ret = bio_integrity_clone(b, bio, gfp_mask, fs_bio_set);
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if (ret < 0) {
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bio_put(b);
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@ -1539,6 +1539,7 @@ 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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@ -1579,6 +1580,9 @@ 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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@ -1616,6 +1620,7 @@ 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();
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biovec_init_slabs();
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fs_bio_set = bioset_create(BIO_POOL_SIZE, 0);
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@ -319,7 +319,6 @@ static inline int bio_has_allocated_vec(struct bio *bio)
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*/
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struct bio_integrity_payload {
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struct bio *bip_bio; /* parent bio */
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struct bio_vec *bip_vec; /* integrity data vector */
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sector_t bip_sector; /* virtual start sector */
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@ -328,11 +327,12 @@ struct bio_integrity_payload {
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unsigned int bip_size;
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unsigned short bip_pool; /* pool the ivec came from */
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unsigned short bip_slab; /* slab the bip came from */
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unsigned short bip_vcnt; /* # of integrity bio_vecs */
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unsigned short bip_idx; /* current bip_vec index */
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struct work_struct bip_work; /* I/O completion */
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struct bio_vec bip_vec[0]; /* embedded bvec array */
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};
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#endif /* CONFIG_BLK_DEV_INTEGRITY */
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@ -430,6 +430,9 @@ 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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@ -634,8 +637,9 @@ static inline struct bio *bio_list_get(struct bio_list *bl)
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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 *);
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extern void bio_integrity_free(struct bio *, struct bio_set *);
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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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@ -645,21 +649,27 @@ 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);
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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(void);
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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) (0)
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#define bio_integrity_free(a) do { } while (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_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)
|
||||
#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(a) do { } while (0)
|
||||
|
||||
#endif /* CONFIG_BLK_DEV_INTEGRITY */
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||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue