mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-20 11:13:58 +08:00
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>
This commit is contained in:
Kent Overstreet
parent
6fda981caf
commit
9f060e2231
@ -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 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
|
||||
#define BIP_INLINE_VECS 4
|
||||
|
||||
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 @@ struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio,
|
||||
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 @@ void bio_integrity_free(struct bio *bio)
|
||||
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 @@ EXPORT_SYMBOL(bio_integrity_clone);
|
||||
|
||||
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 @@ void bioset_integrity_free(struct bio_set *bs)
|
||||
{
|
||||
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 @@ void __init bio_integrity_init(void)
|
||||
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");
|
||||
}
|
||||
|
||||
36
fs/bio.c
36
fs/bio.c
@ -160,12 +160,12 @@ unsigned int bvec_nr_vecs(unsigned short idx)
|
||||
return bvec_slabs[idx].nr_vecs;
|
||||
}
|
||||
|
||||
void bvec_free_bs(struct bio_set *bs, struct bio_vec *bv, unsigned int idx)
|
||||
void bvec_free(mempool_t *pool, struct bio_vec *bv, unsigned int idx)
|
||||
{
|
||||
BIO_BUG_ON(idx >= BIOVEC_NR_POOLS);
|
||||
|
||||
if (idx == BIOVEC_MAX_IDX)
|
||||
mempool_free(bv, bs->bvec_pool);
|
||||
mempool_free(bv, pool);
|
||||
else {
|
||||
struct biovec_slab *bvs = bvec_slabs + idx;
|
||||
|
||||
@ -173,8 +173,8 @@ void bvec_free_bs(struct bio_set *bs, struct bio_vec *bv, unsigned int idx)
|
||||
}
|
||||
}
|
||||
|
||||
struct bio_vec *bvec_alloc_bs(gfp_t gfp_mask, int nr, unsigned long *idx,
|
||||
struct bio_set *bs)
|
||||
struct bio_vec *bvec_alloc(gfp_t gfp_mask, int nr, unsigned long *idx,
|
||||
mempool_t *pool)
|
||||
{
|
||||
struct bio_vec *bvl;
|
||||
|
||||
@ -210,7 +210,7 @@ struct bio_vec *bvec_alloc_bs(gfp_t gfp_mask, int nr, unsigned long *idx,
|
||||
*/
|
||||
if (*idx == BIOVEC_MAX_IDX) {
|
||||
fallback:
|
||||
bvl = mempool_alloc(bs->bvec_pool, gfp_mask);
|
||||
bvl = mempool_alloc(pool, gfp_mask);
|
||||
} else {
|
||||
struct biovec_slab *bvs = bvec_slabs + *idx;
|
||||
gfp_t __gfp_mask = gfp_mask & ~(__GFP_WAIT | __GFP_IO);
|
||||
@ -253,7 +253,7 @@ static void bio_free(struct bio *bio)
|
||||
|
||||
if (bs) {
|
||||
if (bio_has_allocated_vec(bio))
|
||||
bvec_free_bs(bs, bio->bi_io_vec, BIO_POOL_IDX(bio));
|
||||
bvec_free(bs->bvec_pool, bio->bi_io_vec, BIO_POOL_IDX(bio));
|
||||
|
||||
/*
|
||||
* If we have front padding, adjust the bio pointer before freeing
|
||||
@ -442,11 +442,11 @@ struct bio *bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set *bs)
|
||||
bio_init(bio);
|
||||
|
||||
if (nr_iovecs > inline_vecs) {
|
||||
bvl = bvec_alloc_bs(gfp_mask, nr_iovecs, &idx, bs);
|
||||
bvl = bvec_alloc(gfp_mask, nr_iovecs, &idx, bs->bvec_pool);
|
||||
if (!bvl && gfp_mask != saved_gfp) {
|
||||
punt_bios_to_rescuer(bs);
|
||||
gfp_mask = saved_gfp;
|
||||
bvl = bvec_alloc_bs(gfp_mask, nr_iovecs, &idx, bs);
|
||||
bvl = bvec_alloc(gfp_mask, nr_iovecs, &idx, bs->bvec_pool);
|
||||
}
|
||||
|
||||
if (unlikely(!bvl))
|
||||
@ -1661,20 +1661,11 @@ EXPORT_SYMBOL(bio_sector_offset);
|
||||
* create memory pools for biovec's in a bio_set.
|
||||
* use the global biovec slabs created for general use.
|
||||
*/
|
||||
static int biovec_create_pools(struct bio_set *bs, int pool_entries)
|
||||
mempool_t *biovec_create_pool(struct bio_set *bs, int pool_entries)
|
||||
{
|
||||
struct biovec_slab *bp = bvec_slabs + BIOVEC_MAX_IDX;
|
||||
|
||||
bs->bvec_pool = mempool_create_slab_pool(pool_entries, bp->slab);
|
||||
if (!bs->bvec_pool)
|
||||
return -ENOMEM;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void biovec_free_pools(struct bio_set *bs)
|
||||
{
|
||||
mempool_destroy(bs->bvec_pool);
|
||||
return mempool_create_slab_pool(pool_entries, bp->slab);
|
||||
}
|
||||
|
||||
void bioset_free(struct bio_set *bs)
|
||||
@ -1685,8 +1676,10 @@ void bioset_free(struct bio_set *bs)
|
||||
if (bs->bio_pool)
|
||||
mempool_destroy(bs->bio_pool);
|
||||
|
||||
if (bs->bvec_pool)
|
||||
mempool_destroy(bs->bvec_pool);
|
||||
|
||||
bioset_integrity_free(bs);
|
||||
biovec_free_pools(bs);
|
||||
bio_put_slab(bs);
|
||||
|
||||
kfree(bs);
|
||||
@ -1731,7 +1724,8 @@ struct bio_set *bioset_create(unsigned int pool_size, unsigned int front_pad)
|
||||
if (!bs->bio_pool)
|
||||
goto bad;
|
||||
|
||||
if (biovec_create_pools(bs, pool_size))
|
||||
bs->bvec_pool = biovec_create_pool(bs, pool_size);
|
||||
if (!bs->bvec_pool)
|
||||
goto bad;
|
||||
|
||||
bs->rescue_workqueue = alloc_workqueue("bioset", WQ_MEM_RECLAIM, 0);
|
||||
|
||||
@ -213,6 +213,7 @@ extern void bio_pair_release(struct bio_pair *dbio);
|
||||
|
||||
extern struct bio_set *bioset_create(unsigned int, unsigned int);
|
||||
extern void bioset_free(struct bio_set *);
|
||||
extern mempool_t *biovec_create_pool(struct bio_set *bs, int pool_entries);
|
||||
|
||||
extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *);
|
||||
extern void bio_put(struct bio *);
|
||||
@ -288,8 +289,8 @@ extern struct bio *bio_copy_user_iov(struct request_queue *,
|
||||
int, int, gfp_t);
|
||||
extern int bio_uncopy_user(struct bio *);
|
||||
void zero_fill_bio(struct bio *bio);
|
||||
extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set *);
|
||||
extern void bvec_free_bs(struct bio_set *, struct bio_vec *, unsigned int);
|
||||
extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *);
|
||||
extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int);
|
||||
extern unsigned int bvec_nr_vecs(unsigned short idx);
|
||||
|
||||
#ifdef CONFIG_BLK_CGROUP
|
||||
@ -511,10 +512,11 @@ struct bio_set {
|
||||
unsigned int front_pad;
|
||||
|
||||
mempool_t *bio_pool;
|
||||
mempool_t *bvec_pool;
|
||||
#if defined(CONFIG_BLK_DEV_INTEGRITY)
|
||||
mempool_t *bio_integrity_pool;
|
||||
mempool_t *bvec_integrity_pool;
|
||||
#endif
|
||||
mempool_t *bvec_pool;
|
||||
|
||||
/*
|
||||
* Deadlock avoidance for stacking block drivers: see comments in
|
||||
|
||||
Loading…
Reference in New Issue
Block a user