block: Convert integrity to bvec_alloc_bs()
This adds a pointer to the bvec array to struct bio_integrity_payload,
instead of the bvecs always being inline; then the bvecs are allocated
with bvec_alloc_bs().
Changed bvec_alloc_bs() and bvec_free_bs() to take a pointer to a
mempool instead of the bioset, so that bio integrity can use a different
mempool for its bvecs, and thus avoid a potential deadlock.
This is eventually for immutable bio vecs - immutable bvecs aren't
useful if we still have to copy them, hence the need for the pointer.
Less code is always nice too, though.
Also, bio_integrity_alloc() was using fs_bio_set if no bio_set was
specified. This was wrong - using the bio_set doesn't protect us from
memory allocation failures, because we just used kmalloc for the
bio_integrity_payload. But it does introduce the possibility of
deadlock, if for some reason we weren't supposed to be using fs_bio_set.
Signed-off-by: Kent Overstreet <koverstreet@google.com>
CC: Jens Axboe <axboe@kernel.dk>
CC: Martin K. Petersen <martin.petersen@oracle.com>
diff --git a/fs/bio-integrity.c b/fs/bio-integrity.c
index 94fa1c5..8c4c604 100644
--- a/fs/bio-integrity.c
+++ b/fs/bio-integrity.c
@@ -27,48 +27,11 @@
#include <linux/workqueue.h>
#include <linux/slab.h>
-struct integrity_slab {
- struct kmem_cache *slab;
- unsigned short nr_vecs;
- char name[8];
-};
+#define BIP_INLINE_VECS 4
-#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 kmem_cache *bip_slab;
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_MAX_IDX)
- return 1;
-
- return 0;
-}
-
/**
* bio_integrity_alloc - Allocate integrity payload and attach it to bio
* @bio: bio to attach integrity metadata to
@@ -84,38 +47,41 @@
unsigned int nr_vecs)
{
struct bio_integrity_payload *bip;
- unsigned int idx = vecs_to_idx(nr_vecs);
struct bio_set *bs = bio->bi_pool;
+ unsigned long idx = BIO_POOL_NONE;
+ unsigned inline_vecs;
- if (!bs)
- bs = fs_bio_set;
-
- BUG_ON(bio == NULL);
- bip = NULL;
-
- /* Lower order allocations come straight from slab */
- if (!use_bip_pool(idx))
- bip = kmem_cache_alloc(bip_slab[idx].slab, gfp_mask);
-
- /* Use mempool if lower order alloc failed or max vecs were requested */
- if (bip == NULL) {
- idx = BIOVEC_MAX_IDX; /* so we free the payload properly later */
+ if (!bs) {
+ bip = kmalloc(sizeof(struct bio_integrity_payload) +
+ sizeof(struct bio_vec) * nr_vecs, gfp_mask);
+ inline_vecs = nr_vecs;
+ } else {
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;
- }
+ inline_vecs = BIP_INLINE_VECS;
}
+ if (unlikely(!bip))
+ return NULL;
+
memset(bip, 0, sizeof(*bip));
+ if (nr_vecs > inline_vecs) {
+ bip->bip_vec = bvec_alloc(gfp_mask, nr_vecs, &idx,
+ bs->bvec_integrity_pool);
+ if (!bip->bip_vec)
+ goto err;
+ } else {
+ bip->bip_vec = bip->bip_inline_vecs;
+ }
+
bip->bip_slab = idx;
bip->bip_bio = bio;
- bip->bip_vec = bip->bip_inline_vecs;
bio->bi_integrity = bip;
return bip;
+err:
+ mempool_free(bip, bs->bio_integrity_pool);
+ return NULL;
}
EXPORT_SYMBOL(bio_integrity_alloc);
@@ -131,20 +97,20 @@
struct bio_integrity_payload *bip = bio->bi_integrity;
struct bio_set *bs = bio->bi_pool;
- if (!bs)
- bs = fs_bio_set;
-
- BUG_ON(bip == NULL);
-
/* A cloned bio doesn't own the integrity metadata */
if (!bio_flagged(bio, BIO_CLONED) && !bio_flagged(bio, BIO_FS_INTEGRITY)
&& bip->bip_buf != NULL)
kfree(bip->bip_buf);
- if (use_bip_pool(bip->bip_slab))
+ if (bs) {
+ if (bip->bip_slab != BIO_POOL_NONE)
+ bvec_free(bs->bvec_integrity_pool, bip->bip_vec,
+ bip->bip_slab);
+
mempool_free(bip, bs->bio_integrity_pool);
- else
- kmem_cache_free(bip_slab[bip->bip_slab].slab, bip);
+ } else {
+ kfree(bip);
+ }
bio->bi_integrity = NULL;
}
@@ -747,13 +713,14 @@
int bioset_integrity_create(struct bio_set *bs, int pool_size)
{
- unsigned int max_slab = vecs_to_idx(BIO_MAX_PAGES);
-
if (bs->bio_integrity_pool)
return 0;
- bs->bio_integrity_pool =
- mempool_create_slab_pool(pool_size, bip_slab[max_slab].slab);
+ bs->bio_integrity_pool = mempool_create_slab_pool(pool_size, bip_slab);
+
+ bs->bvec_integrity_pool = biovec_create_pool(bs, pool_size);
+ if (!bs->bvec_integrity_pool)
+ return -1;
if (!bs->bio_integrity_pool)
return -1;
@@ -766,13 +733,14 @@
{
if (bs->bio_integrity_pool)
mempool_destroy(bs->bio_integrity_pool);
+
+ if (bs->bvec_integrity_pool)
+ mempool_destroy(bs->bio_integrity_pool);
}
EXPORT_SYMBOL(bioset_integrity_free);
void __init bio_integrity_init(void)
{
- unsigned int i;
-
/*
* kintegrityd won't block much but may burn a lot of CPU cycles.
* Make it highpri CPU intensive wq with max concurrency of 1.
@@ -782,14 +750,10 @@
if (!kintegrityd_wq)
panic("Failed to create kintegrityd\n");
- 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);
- }
+ bip_slab = kmem_cache_create("bio_integrity_payload",
+ sizeof(struct bio_integrity_payload) +
+ sizeof(struct bio_vec) * BIP_INLINE_VECS,
+ 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
+ if (!bip_slab)
+ panic("Failed to create slab\n");
}