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)>

2 files changed, 133 insertions, 48 deletions

diff --git a/fs/bio-integrity.c b/fs/bio-integrity.c
index 31c46a241bac..49a34e7f7306 100644
--- a/fs/bio-integrity.c
+++ b/fs/bio-integrity.c
@@ -1,7 +1,7 @@
 /*
  * 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
@@ -25,63 +25,121 @@
 #include <linux/bio.h>
 #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;
+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 - Allocate integrity payload and attach it to bio
+ * bio_integrity_alloc_bioset - 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(struct bio *bio,
-                                                  gfp_t gfp_mask,
-                                                  unsigned int nr_vecs)
+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 *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(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, integrity_bio_set);
-        if (unlikely(iv == NULL)) {
-                printk(KERN_ERR "%s: could not alloc bip_vec\n", __func__);
-                mempool_free(bip, 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;
 
         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)
+void bio_integrity_free(struct bio *bio, struct bio_set *bs)
 {
         struct bio_integrity_payload *bip = bio->bi_integrity;
 
@@ -92,8 +150,10 @@ void bio_integrity_free(struct bio *bio)
             && bip->bip_buf != NULL)
                 kfree(bip->bip_buf);
 
-        bvec_free_bs(integrity_bio_set, bip->bip_vec, bip->bip_pool);
-        mempool_free(bip, 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;
 }
@@ -114,7 +174,7 @@ int bio_integrity_add_page(struct bio *bio, struct page *page,
         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;
         }
@@ -647,8 +707,8 @@ void bio_integrity_split(struct bio *bio, struct bio_pair *bp, int sectors)
         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;
@@ -667,17 +727,19 @@ 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)
+int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
+                        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(bio, gfp_mask, bip_src->bip_vcnt);
+        bip = bio_integrity_alloc_bioset(bio, gfp_mask, bip_src->bip_vcnt, bs);
 
         if (bip == NULL)
                 return -EIO;
@@ -693,25 +755,43 @@ int bio_integrity_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp_mask)
 }
 EXPORT_SYMBOL(bio_integrity_clone);
 
-static int __init bio_integrity_init(void)
+int bioset_integrity_create(struct bio_set *bs, int pool_size)
 {
-        kintegrityd_wq = create_workqueue("kintegrityd");
+        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;
+
+        return 0;
+}
+EXPORT_SYMBOL(bioset_integrity_create);
+
+void bioset_integrity_free(struct bio_set *bs)
+{
+        if (bs->bio_integrity_pool)
+                mempool_destroy(bs->bio_integrity_pool);
+}
+EXPORT_SYMBOL(bioset_integrity_free);
+
+void __init bio_integrity_init(void)
+{
+        unsigned int i;
+
+        kintegrityd_wq = create_workqueue("kintegrityd");
         if (!kintegrityd_wq)
                 panic("Failed to create kintegrityd\n");
 
-        bio_integrity_slab = KMEM_CACHE(bio_integrity_payload,
-                                        SLAB_HWCACHE_ALIGN|SLAB_PANIC);
+        for (i = 0 ; i < BIOVEC_NR_POOLS ; i++) {
+                unsigned int size;
 
-        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");
+                size = sizeof(struct bio_integrity_payload)
+                        + bip_slab[i].nr_vecs * sizeof(struct bio_vec);
 
-        integrity_bio_set = bioset_create(BIO_POOL_SIZE, 0);
-        if (!integrity_bio_set)
-                panic("bio_integrity: can't allocate bio_set\n");
-
-        return 0;
+                bip_slab[i].slab =
+                        kmem_cache_create(bip_slab[i].name, size, 0,
+                                          SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
+        }
 }
-subsys_initcall(bio_integrity_init);
diff --git a/fs/bio.c b/fs/bio.c
index 24c914043532..1486b19fc431 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -238,7 +238,7 @@ 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);
+                bio_integrity_free(bio, bs);
 
         /*
          * If we have front padding, adjust the bio pointer before freeing
@@ -341,7 +341,7 @@ struct bio *bio_alloc(gfp_t gfp_mask, int nr_iovecs)
 static void bio_kmalloc_destructor(struct bio *bio)
 {
         if (bio_integrity(bio))
-                bio_integrity_free(bio);
+                bio_integrity_free(bio, fs_bio_set);
         kfree(bio);
 }
 
@@ -472,7 +472,7 @@ 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);
+                ret = bio_integrity_clone(b, bio, gfp_mask, fs_bio_set);
 
                 if (ret < 0) {
                         bio_put(b);
@@ -1539,6 +1539,7 @@ 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);
 
@@ -1579,6 +1580,9 @@ 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;
 
@@ -1616,6 +1620,7 @@ static int __init init_bio(void)
         if (!bio_slabs)
                 panic("bio: can't allocate bios\n");
 
+        bio_integrity_init();
         biovec_init_slabs();
 
         fs_bio_set = bioset_create(BIO_POOL_SIZE, 0);