/*
* bio-integrity.c - bio data integrity extensions
*
- * Copyright (C) 2007, 2008 Oracle Corporation
+ * Copyright (C) 2007, 2008, 2009 Oracle Corporation
* Written by: Martin K. Petersen <martin.petersen@oracle.com>
*
* This program is free software; you can redistribute it and/or
#include <linux/bio.h>
#include <linux/workqueue.h>
-static struct kmem_cache *bio_integrity_slab __read_mostly;
+struct integrity_slab {
+ struct kmem_cache *slab;
+ unsigned short nr_vecs;
+ char name[8];
+};
+
+#define IS(x) { .nr_vecs = x, .name = "bip-"__stringify(x) }
+struct integrity_slab bip_slab[BIOVEC_NR_POOLS] __read_mostly = {
+ IS(1), IS(4), IS(16), IS(64), IS(128), IS(BIO_MAX_PAGES),
+};
+#undef IS
+
static struct workqueue_struct *kintegrityd_wq;
+static inline unsigned int vecs_to_idx(unsigned int nr)
+{
+ switch (nr) {
+ case 1:
+ return 0;
+ case 2 ... 4:
+ return 1;
+ case 5 ... 16:
+ return 2;
+ case 17 ... 64:
+ return 3;
+ case 65 ... 128:
+ return 4;
+ case 129 ... BIO_MAX_PAGES:
+ return 5;
+ default:
+ BUG();
+ }
+}
+
+static inline int use_bip_pool(unsigned int idx)
+{
+ if (idx == BIOVEC_NR_POOLS)
+ return 1;
+
+ return 0;
+}
+
/**
* bio_integrity_alloc_bioset - Allocate integrity payload and attach it to bio
* @bio: bio to attach integrity metadata to
struct bio_set *bs)
{
struct bio_integrity_payload *bip;
- struct bio_vec *iv;
- unsigned long idx;
+ unsigned int idx = vecs_to_idx(nr_vecs);
BUG_ON(bio == NULL);
+ bip = NULL;
- bip = mempool_alloc(bs->bio_integrity_pool, gfp_mask);
- if (unlikely(bip == NULL)) {
- printk(KERN_ERR "%s: could not alloc bip\n", __func__);
- return NULL;
- }
+ /* Lower order allocations come straight from slab */
+ if (!use_bip_pool(idx))
+ bip = kmem_cache_alloc(bip_slab[idx].slab, gfp_mask);
- memset(bip, 0, sizeof(*bip));
+ /* Use mempool if lower order alloc failed or max vecs were requested */
+ if (bip == NULL) {
+ bip = mempool_alloc(bs->bio_integrity_pool, gfp_mask);
- iv = bvec_alloc_bs(gfp_mask, nr_vecs, &idx, bs);
- if (unlikely(iv == NULL)) {
- printk(KERN_ERR "%s: could not alloc bip_vec\n", __func__);
- mempool_free(bip, bs->bio_integrity_pool);
- return NULL;
+ if (unlikely(bip == NULL)) {
+ printk(KERN_ERR "%s: could not alloc bip\n", __func__);
+ return NULL;
+ }
}
- bip->bip_pool = idx;
- bip->bip_vec = iv;
+ memset(bip, 0, sizeof(*bip));
+
+ bip->bip_slab = idx;
bip->bip_bio = bio;
bio->bi_integrity = bip;
&& 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);
+ if (use_bip_pool(bip->bip_slab))
+ mempool_free(bip, bs->bio_integrity_pool);
+ else
+ kmem_cache_free(bip_slab[bip->bip_slab].slab, bip);
bio->bi_integrity = NULL;
}
struct bio_integrity_payload *bip = bio->bi_integrity;
struct bio_vec *iv;
- if (bip->bip_vcnt >= bvec_nr_vecs(bip->bip_pool)) {
+ if (bip->bip_vcnt >= bvec_nr_vecs(bip->bip_slab)) {
printk(KERN_ERR "%s: bip_vec full\n", __func__);
return 0;
}
bp->iv1 = bip->bip_vec[0];
bp->iv2 = bip->bip_vec[0];
- bp->bip1.bip_vec = &bp->iv1;
- bp->bip2.bip_vec = &bp->iv2;
+ bp->bip1.bip_vec[0] = bp->iv1;
+ bp->bip2.bip_vec[0] = bp->iv2;
bp->iv1.bv_len = sectors * bi->tuple_size;
bp->iv2.bv_offset += sectors * bi->tuple_size;
* bio_integrity_clone - Callback for cloning bios with integrity metadata
* @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,
- struct bio_set *bs)
+ gfp_t gfp_mask, struct bio_set *bs)
{
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_NOIO, bip_src->bip_vcnt, bs);
+ bip = bio_integrity_alloc_bioset(bio, gfp_mask, bip_src->bip_vcnt, bs);
if (bip == NULL)
return -EIO;
int bioset_integrity_create(struct bio_set *bs, int pool_size)
{
- bs->bio_integrity_pool = mempool_create_slab_pool(pool_size,
- bio_integrity_slab);
+ unsigned int max_slab = vecs_to_idx(BIO_MAX_PAGES);
+
+ bs->bio_integrity_pool =
+ mempool_create_slab_pool(pool_size, bip_slab[max_slab].slab);
+
if (!bs->bio_integrity_pool)
return -1;
}
EXPORT_SYMBOL(bioset_integrity_free);
-void __init bio_integrity_init_slab(void)
+void __init bio_integrity_init(void)
{
- bio_integrity_slab = KMEM_CACHE(bio_integrity_payload,
- SLAB_HWCACHE_ALIGN|SLAB_PANIC);
-}
+ unsigned int i;
-static int __init integrity_init(void)
-{
kintegrityd_wq = create_workqueue("kintegrityd");
-
if (!kintegrityd_wq)
panic("Failed to create kintegrityd\n");
- return 0;
+ for (i = 0 ; i < BIOVEC_NR_POOLS ; i++) {
+ unsigned int size;
+
+ size = sizeof(struct bio_integrity_payload)
+ + bip_slab[i].nr_vecs * sizeof(struct bio_vec);
+
+ bip_slab[i].slab =
+ kmem_cache_create(bip_slab[i].name, size, 0,
+ SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
+ }
}
-subsys_initcall(integrity_init);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff