mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Kent Overstreet](/assets/img/avatar_default.png)
Now that bios keep track of where they were allocated from, bio_integrity_alloc_bioset() becomes redundant. Remove bio_integrity_alloc_bioset() and drop bio_set argument from the related functions and make them use bio->bi_pool. Signed-off-by: Kent Overstreet <koverstreet@google.com> CC: Jens Axboe <axboe@kernel.dk> CC: Martin K. Petersen <martin.petersen@oracle.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
794 lines
20 KiB
C
794 lines
20 KiB
C
/*
|
|
* bio-integrity.c - bio data integrity extensions
|
|
*
|
|
* 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
|
|
* modify it under the terms of the GNU General Public License version
|
|
* 2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; see the file COPYING. If not, write to
|
|
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
|
|
* USA.
|
|
*
|
|
*/
|
|
|
|
#include <linux/blkdev.h>
|
|
#include <linux/mempool.h>
|
|
#include <linux/export.h>
|
|
#include <linux/bio.h>
|
|
#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
|
|
|
|
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
|
|
* @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)
|
|
{
|
|
struct bio_integrity_payload *bip;
|
|
unsigned int idx = vecs_to_idx(nr_vecs);
|
|
struct bio_set *bs = bio->bi_pool;
|
|
|
|
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 */
|
|
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;
|
|
}
|
|
}
|
|
|
|
memset(bip, 0, sizeof(*bip));
|
|
|
|
bip->bip_slab = idx;
|
|
bip->bip_bio = bio;
|
|
bio->bi_integrity = bip;
|
|
|
|
return bip;
|
|
}
|
|
EXPORT_SYMBOL(bio_integrity_alloc);
|
|
|
|
/**
|
|
* bio_integrity_free - Free bio integrity payload
|
|
* @bio: bio containing bip to be freed
|
|
*
|
|
* Description: Used to free the integrity portion of a bio. Usually
|
|
* called from bio_free().
|
|
*/
|
|
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))
|
|
mempool_free(bip, bs->bio_integrity_pool);
|
|
else
|
|
kmem_cache_free(bip_slab[bip->bip_slab].slab, bip);
|
|
|
|
bio->bi_integrity = NULL;
|
|
}
|
|
EXPORT_SYMBOL(bio_integrity_free);
|
|
|
|
/**
|
|
* bio_integrity_add_page - Attach integrity metadata
|
|
* @bio: bio to update
|
|
* @page: page containing integrity metadata
|
|
* @len: number of bytes of integrity metadata in page
|
|
* @offset: start offset within page
|
|
*
|
|
* Description: Attach a page containing integrity metadata to bio.
|
|
*/
|
|
int bio_integrity_add_page(struct bio *bio, struct page *page,
|
|
unsigned int len, unsigned int offset)
|
|
{
|
|
struct bio_integrity_payload *bip = bio->bi_integrity;
|
|
struct bio_vec *iv;
|
|
|
|
if (bip->bip_vcnt >= bvec_nr_vecs(bip->bip_slab)) {
|
|
printk(KERN_ERR "%s: bip_vec full\n", __func__);
|
|
return 0;
|
|
}
|
|
|
|
iv = bip_vec_idx(bip, bip->bip_vcnt);
|
|
BUG_ON(iv == NULL);
|
|
|
|
iv->bv_page = page;
|
|
iv->bv_len = len;
|
|
iv->bv_offset = offset;
|
|
bip->bip_vcnt++;
|
|
|
|
return len;
|
|
}
|
|
EXPORT_SYMBOL(bio_integrity_add_page);
|
|
|
|
static int bdev_integrity_enabled(struct block_device *bdev, int rw)
|
|
{
|
|
struct blk_integrity *bi = bdev_get_integrity(bdev);
|
|
|
|
if (bi == NULL)
|
|
return 0;
|
|
|
|
if (rw == READ && bi->verify_fn != NULL &&
|
|
(bi->flags & INTEGRITY_FLAG_READ))
|
|
return 1;
|
|
|
|
if (rw == WRITE && bi->generate_fn != NULL &&
|
|
(bi->flags & INTEGRITY_FLAG_WRITE))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* bio_integrity_enabled - Check whether integrity can be passed
|
|
* @bio: bio to check
|
|
*
|
|
* Description: Determines whether bio_integrity_prep() can be called
|
|
* on this bio or not. bio data direction and target device must be
|
|
* set prior to calling. The functions honors the write_generate and
|
|
* read_verify flags in sysfs.
|
|
*/
|
|
int bio_integrity_enabled(struct bio *bio)
|
|
{
|
|
/* Already protected? */
|
|
if (bio_integrity(bio))
|
|
return 0;
|
|
|
|
return bdev_integrity_enabled(bio->bi_bdev, bio_data_dir(bio));
|
|
}
|
|
EXPORT_SYMBOL(bio_integrity_enabled);
|
|
|
|
/**
|
|
* bio_integrity_hw_sectors - Convert 512b sectors to hardware ditto
|
|
* @bi: blk_integrity profile for device
|
|
* @sectors: Number of 512 sectors to convert
|
|
*
|
|
* Description: The block layer calculates everything in 512 byte
|
|
* sectors but integrity metadata is done in terms of the hardware
|
|
* sector size of the storage device. Convert the block layer sectors
|
|
* to physical sectors.
|
|
*/
|
|
static inline unsigned int bio_integrity_hw_sectors(struct blk_integrity *bi,
|
|
unsigned int sectors)
|
|
{
|
|
/* At this point there are only 512b or 4096b DIF/EPP devices */
|
|
if (bi->sector_size == 4096)
|
|
return sectors >>= 3;
|
|
|
|
return sectors;
|
|
}
|
|
|
|
/**
|
|
* bio_integrity_tag_size - Retrieve integrity tag space
|
|
* @bio: bio to inspect
|
|
*
|
|
* Description: Returns the maximum number of tag bytes that can be
|
|
* attached to this bio. Filesystems can use this to determine how
|
|
* much metadata to attach to an I/O.
|
|
*/
|
|
unsigned int bio_integrity_tag_size(struct bio *bio)
|
|
{
|
|
struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
|
|
|
|
BUG_ON(bio->bi_size == 0);
|
|
|
|
return bi->tag_size * (bio->bi_size / bi->sector_size);
|
|
}
|
|
EXPORT_SYMBOL(bio_integrity_tag_size);
|
|
|
|
int bio_integrity_tag(struct bio *bio, void *tag_buf, unsigned int len, int set)
|
|
{
|
|
struct bio_integrity_payload *bip = bio->bi_integrity;
|
|
struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
|
|
unsigned int nr_sectors;
|
|
|
|
BUG_ON(bip->bip_buf == NULL);
|
|
|
|
if (bi->tag_size == 0)
|
|
return -1;
|
|
|
|
nr_sectors = bio_integrity_hw_sectors(bi,
|
|
DIV_ROUND_UP(len, bi->tag_size));
|
|
|
|
if (nr_sectors * bi->tuple_size > bip->bip_size) {
|
|
printk(KERN_ERR "%s: tag too big for bio: %u > %u\n",
|
|
__func__, nr_sectors * bi->tuple_size, bip->bip_size);
|
|
return -1;
|
|
}
|
|
|
|
if (set)
|
|
bi->set_tag_fn(bip->bip_buf, tag_buf, nr_sectors);
|
|
else
|
|
bi->get_tag_fn(bip->bip_buf, tag_buf, nr_sectors);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* bio_integrity_set_tag - Attach a tag buffer to a bio
|
|
* @bio: bio to attach buffer to
|
|
* @tag_buf: Pointer to a buffer containing tag data
|
|
* @len: Length of the included buffer
|
|
*
|
|
* Description: Use this function to tag a bio by leveraging the extra
|
|
* space provided by devices formatted with integrity protection. The
|
|
* size of the integrity buffer must be <= to the size reported by
|
|
* bio_integrity_tag_size().
|
|
*/
|
|
int bio_integrity_set_tag(struct bio *bio, void *tag_buf, unsigned int len)
|
|
{
|
|
BUG_ON(bio_data_dir(bio) != WRITE);
|
|
|
|
return bio_integrity_tag(bio, tag_buf, len, 1);
|
|
}
|
|
EXPORT_SYMBOL(bio_integrity_set_tag);
|
|
|
|
/**
|
|
* bio_integrity_get_tag - Retrieve a tag buffer from a bio
|
|
* @bio: bio to retrieve buffer from
|
|
* @tag_buf: Pointer to a buffer for the tag data
|
|
* @len: Length of the target buffer
|
|
*
|
|
* Description: Use this function to retrieve the tag buffer from a
|
|
* completed I/O. The size of the integrity buffer must be <= to the
|
|
* size reported by bio_integrity_tag_size().
|
|
*/
|
|
int bio_integrity_get_tag(struct bio *bio, void *tag_buf, unsigned int len)
|
|
{
|
|
BUG_ON(bio_data_dir(bio) != READ);
|
|
|
|
return bio_integrity_tag(bio, tag_buf, len, 0);
|
|
}
|
|
EXPORT_SYMBOL(bio_integrity_get_tag);
|
|
|
|
/**
|
|
* bio_integrity_generate - Generate integrity metadata for a bio
|
|
* @bio: bio to generate integrity metadata for
|
|
*
|
|
* Description: Generates integrity metadata for a bio by calling the
|
|
* block device's generation callback function. The bio must have a
|
|
* bip attached with enough room to accommodate the generated
|
|
* integrity metadata.
|
|
*/
|
|
static void bio_integrity_generate(struct bio *bio)
|
|
{
|
|
struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
|
|
struct blk_integrity_exchg bix;
|
|
struct bio_vec *bv;
|
|
sector_t sector = bio->bi_sector;
|
|
unsigned int i, sectors, total;
|
|
void *prot_buf = bio->bi_integrity->bip_buf;
|
|
|
|
total = 0;
|
|
bix.disk_name = bio->bi_bdev->bd_disk->disk_name;
|
|
bix.sector_size = bi->sector_size;
|
|
|
|
bio_for_each_segment(bv, bio, i) {
|
|
void *kaddr = kmap_atomic(bv->bv_page);
|
|
bix.data_buf = kaddr + bv->bv_offset;
|
|
bix.data_size = bv->bv_len;
|
|
bix.prot_buf = prot_buf;
|
|
bix.sector = sector;
|
|
|
|
bi->generate_fn(&bix);
|
|
|
|
sectors = bv->bv_len / bi->sector_size;
|
|
sector += sectors;
|
|
prot_buf += sectors * bi->tuple_size;
|
|
total += sectors * bi->tuple_size;
|
|
BUG_ON(total > bio->bi_integrity->bip_size);
|
|
|
|
kunmap_atomic(kaddr);
|
|
}
|
|
}
|
|
|
|
static inline unsigned short blk_integrity_tuple_size(struct blk_integrity *bi)
|
|
{
|
|
if (bi)
|
|
return bi->tuple_size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* bio_integrity_prep - Prepare bio for integrity I/O
|
|
* @bio: bio to prepare
|
|
*
|
|
* Description: Allocates a buffer for integrity metadata, maps the
|
|
* pages and attaches them to a bio. The bio must have data
|
|
* direction, target device and start sector set priot to calling. In
|
|
* the WRITE case, integrity metadata will be generated using the
|
|
* block device's integrity function. In the READ case, the buffer
|
|
* will be prepared for DMA and a suitable end_io handler set up.
|
|
*/
|
|
int bio_integrity_prep(struct bio *bio)
|
|
{
|
|
struct bio_integrity_payload *bip;
|
|
struct blk_integrity *bi;
|
|
struct request_queue *q;
|
|
void *buf;
|
|
unsigned long start, end;
|
|
unsigned int len, nr_pages;
|
|
unsigned int bytes, offset, i;
|
|
unsigned int sectors;
|
|
|
|
bi = bdev_get_integrity(bio->bi_bdev);
|
|
q = bdev_get_queue(bio->bi_bdev);
|
|
BUG_ON(bi == NULL);
|
|
BUG_ON(bio_integrity(bio));
|
|
|
|
sectors = bio_integrity_hw_sectors(bi, bio_sectors(bio));
|
|
|
|
/* Allocate kernel buffer for protection data */
|
|
len = sectors * blk_integrity_tuple_size(bi);
|
|
buf = kmalloc(len, GFP_NOIO | q->bounce_gfp);
|
|
if (unlikely(buf == NULL)) {
|
|
printk(KERN_ERR "could not allocate integrity buffer\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
|
|
start = ((unsigned long) buf) >> PAGE_SHIFT;
|
|
nr_pages = end - start;
|
|
|
|
/* Allocate bio integrity payload and integrity vectors */
|
|
bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages);
|
|
if (unlikely(bip == NULL)) {
|
|
printk(KERN_ERR "could not allocate data integrity bioset\n");
|
|
kfree(buf);
|
|
return -EIO;
|
|
}
|
|
|
|
bip->bip_buf = buf;
|
|
bip->bip_size = len;
|
|
bip->bip_sector = bio->bi_sector;
|
|
|
|
/* Map it */
|
|
offset = offset_in_page(buf);
|
|
for (i = 0 ; i < nr_pages ; i++) {
|
|
int ret;
|
|
bytes = PAGE_SIZE - offset;
|
|
|
|
if (len <= 0)
|
|
break;
|
|
|
|
if (bytes > len)
|
|
bytes = len;
|
|
|
|
ret = bio_integrity_add_page(bio, virt_to_page(buf),
|
|
bytes, offset);
|
|
|
|
if (ret == 0)
|
|
return 0;
|
|
|
|
if (ret < bytes)
|
|
break;
|
|
|
|
buf += bytes;
|
|
len -= bytes;
|
|
offset = 0;
|
|
}
|
|
|
|
/* Install custom I/O completion handler if read verify is enabled */
|
|
if (bio_data_dir(bio) == READ) {
|
|
bip->bip_end_io = bio->bi_end_io;
|
|
bio->bi_end_io = bio_integrity_endio;
|
|
}
|
|
|
|
/* Auto-generate integrity metadata if this is a write */
|
|
if (bio_data_dir(bio) == WRITE)
|
|
bio_integrity_generate(bio);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(bio_integrity_prep);
|
|
|
|
/**
|
|
* bio_integrity_verify - Verify integrity metadata for a bio
|
|
* @bio: bio to verify
|
|
*
|
|
* Description: This function is called to verify the integrity of a
|
|
* bio. The data in the bio io_vec is compared to the integrity
|
|
* metadata returned by the HBA.
|
|
*/
|
|
static int bio_integrity_verify(struct bio *bio)
|
|
{
|
|
struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
|
|
struct blk_integrity_exchg bix;
|
|
struct bio_vec *bv;
|
|
sector_t sector = bio->bi_integrity->bip_sector;
|
|
unsigned int i, sectors, total, ret;
|
|
void *prot_buf = bio->bi_integrity->bip_buf;
|
|
|
|
ret = total = 0;
|
|
bix.disk_name = bio->bi_bdev->bd_disk->disk_name;
|
|
bix.sector_size = bi->sector_size;
|
|
|
|
bio_for_each_segment(bv, bio, i) {
|
|
void *kaddr = kmap_atomic(bv->bv_page);
|
|
bix.data_buf = kaddr + bv->bv_offset;
|
|
bix.data_size = bv->bv_len;
|
|
bix.prot_buf = prot_buf;
|
|
bix.sector = sector;
|
|
|
|
ret = bi->verify_fn(&bix);
|
|
|
|
if (ret) {
|
|
kunmap_atomic(kaddr);
|
|
return ret;
|
|
}
|
|
|
|
sectors = bv->bv_len / bi->sector_size;
|
|
sector += sectors;
|
|
prot_buf += sectors * bi->tuple_size;
|
|
total += sectors * bi->tuple_size;
|
|
BUG_ON(total > bio->bi_integrity->bip_size);
|
|
|
|
kunmap_atomic(kaddr);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* bio_integrity_verify_fn - Integrity I/O completion worker
|
|
* @work: Work struct stored in bio to be verified
|
|
*
|
|
* Description: This workqueue function is called to complete a READ
|
|
* request. The function verifies the transferred integrity metadata
|
|
* and then calls the original bio end_io function.
|
|
*/
|
|
static void bio_integrity_verify_fn(struct work_struct *work)
|
|
{
|
|
struct bio_integrity_payload *bip =
|
|
container_of(work, struct bio_integrity_payload, bip_work);
|
|
struct bio *bio = bip->bip_bio;
|
|
int error;
|
|
|
|
error = bio_integrity_verify(bio);
|
|
|
|
/* Restore original bio completion handler */
|
|
bio->bi_end_io = bip->bip_end_io;
|
|
bio_endio(bio, error);
|
|
}
|
|
|
|
/**
|
|
* bio_integrity_endio - Integrity I/O completion function
|
|
* @bio: Protected bio
|
|
* @error: Pointer to errno
|
|
*
|
|
* Description: Completion for integrity I/O
|
|
*
|
|
* Normally I/O completion is done in interrupt context. However,
|
|
* verifying I/O integrity is a time-consuming task which must be run
|
|
* in process context. This function postpones completion
|
|
* accordingly.
|
|
*/
|
|
void bio_integrity_endio(struct bio *bio, int error)
|
|
{
|
|
struct bio_integrity_payload *bip = bio->bi_integrity;
|
|
|
|
BUG_ON(bip->bip_bio != bio);
|
|
|
|
/* In case of an I/O error there is no point in verifying the
|
|
* integrity metadata. Restore original bio end_io handler
|
|
* and run it.
|
|
*/
|
|
if (error) {
|
|
bio->bi_end_io = bip->bip_end_io;
|
|
bio_endio(bio, error);
|
|
|
|
return;
|
|
}
|
|
|
|
INIT_WORK(&bip->bip_work, bio_integrity_verify_fn);
|
|
queue_work(kintegrityd_wq, &bip->bip_work);
|
|
}
|
|
EXPORT_SYMBOL(bio_integrity_endio);
|
|
|
|
/**
|
|
* bio_integrity_mark_head - Advance bip_vec skip bytes
|
|
* @bip: Integrity vector to advance
|
|
* @skip: Number of bytes to advance it
|
|
*/
|
|
void bio_integrity_mark_head(struct bio_integrity_payload *bip,
|
|
unsigned int skip)
|
|
{
|
|
struct bio_vec *iv;
|
|
unsigned int i;
|
|
|
|
bip_for_each_vec(iv, bip, i) {
|
|
if (skip == 0) {
|
|
bip->bip_idx = i;
|
|
return;
|
|
} else if (skip >= iv->bv_len) {
|
|
skip -= iv->bv_len;
|
|
} else { /* skip < iv->bv_len) */
|
|
iv->bv_offset += skip;
|
|
iv->bv_len -= skip;
|
|
bip->bip_idx = i;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* bio_integrity_mark_tail - Truncate bip_vec to be len bytes long
|
|
* @bip: Integrity vector to truncate
|
|
* @len: New length of integrity vector
|
|
*/
|
|
void bio_integrity_mark_tail(struct bio_integrity_payload *bip,
|
|
unsigned int len)
|
|
{
|
|
struct bio_vec *iv;
|
|
unsigned int i;
|
|
|
|
bip_for_each_vec(iv, bip, i) {
|
|
if (len == 0) {
|
|
bip->bip_vcnt = i;
|
|
return;
|
|
} else if (len >= iv->bv_len) {
|
|
len -= iv->bv_len;
|
|
} else { /* len < iv->bv_len) */
|
|
iv->bv_len = len;
|
|
len = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* bio_integrity_advance - Advance integrity vector
|
|
* @bio: bio whose integrity vector to update
|
|
* @bytes_done: number of data bytes that have been completed
|
|
*
|
|
* Description: This function calculates how many integrity bytes the
|
|
* number of completed data bytes correspond to and advances the
|
|
* integrity vector accordingly.
|
|
*/
|
|
void bio_integrity_advance(struct bio *bio, unsigned int bytes_done)
|
|
{
|
|
struct bio_integrity_payload *bip = bio->bi_integrity;
|
|
struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
|
|
unsigned int nr_sectors;
|
|
|
|
BUG_ON(bip == NULL);
|
|
BUG_ON(bi == NULL);
|
|
|
|
nr_sectors = bio_integrity_hw_sectors(bi, bytes_done >> 9);
|
|
bio_integrity_mark_head(bip, nr_sectors * bi->tuple_size);
|
|
}
|
|
EXPORT_SYMBOL(bio_integrity_advance);
|
|
|
|
/**
|
|
* bio_integrity_trim - Trim integrity vector
|
|
* @bio: bio whose integrity vector to update
|
|
* @offset: offset to first data sector
|
|
* @sectors: number of data sectors
|
|
*
|
|
* Description: Used to trim the integrity vector in a cloned bio.
|
|
* The ivec will be advanced corresponding to 'offset' data sectors
|
|
* and the length will be truncated corresponding to 'len' data
|
|
* sectors.
|
|
*/
|
|
void bio_integrity_trim(struct bio *bio, unsigned int offset,
|
|
unsigned int sectors)
|
|
{
|
|
struct bio_integrity_payload *bip = bio->bi_integrity;
|
|
struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
|
|
unsigned int nr_sectors;
|
|
|
|
BUG_ON(bip == NULL);
|
|
BUG_ON(bi == NULL);
|
|
BUG_ON(!bio_flagged(bio, BIO_CLONED));
|
|
|
|
nr_sectors = bio_integrity_hw_sectors(bi, sectors);
|
|
bip->bip_sector = bip->bip_sector + offset;
|
|
bio_integrity_mark_head(bip, offset * bi->tuple_size);
|
|
bio_integrity_mark_tail(bip, sectors * bi->tuple_size);
|
|
}
|
|
EXPORT_SYMBOL(bio_integrity_trim);
|
|
|
|
/**
|
|
* bio_integrity_split - Split integrity metadata
|
|
* @bio: Protected bio
|
|
* @bp: Resulting bio_pair
|
|
* @sectors: Offset
|
|
*
|
|
* Description: Splits an integrity page into a bio_pair.
|
|
*/
|
|
void bio_integrity_split(struct bio *bio, struct bio_pair *bp, int sectors)
|
|
{
|
|
struct blk_integrity *bi;
|
|
struct bio_integrity_payload *bip = bio->bi_integrity;
|
|
unsigned int nr_sectors;
|
|
|
|
if (bio_integrity(bio) == 0)
|
|
return;
|
|
|
|
bi = bdev_get_integrity(bio->bi_bdev);
|
|
BUG_ON(bi == NULL);
|
|
BUG_ON(bip->bip_vcnt != 1);
|
|
|
|
nr_sectors = bio_integrity_hw_sectors(bi, sectors);
|
|
|
|
bp->bio1.bi_integrity = &bp->bip1;
|
|
bp->bio2.bi_integrity = &bp->bip2;
|
|
|
|
bp->iv1 = bip->bip_vec[0];
|
|
bp->iv2 = bip->bip_vec[0];
|
|
|
|
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;
|
|
bp->iv2.bv_len -= sectors * bi->tuple_size;
|
|
|
|
bp->bip1.bip_sector = bio->bi_integrity->bip_sector;
|
|
bp->bip2.bip_sector = bio->bi_integrity->bip_sector + nr_sectors;
|
|
|
|
bp->bip1.bip_vcnt = bp->bip2.bip_vcnt = 1;
|
|
bp->bip1.bip_idx = bp->bip2.bip_idx = 0;
|
|
}
|
|
EXPORT_SYMBOL(bio_integrity_split);
|
|
|
|
/**
|
|
* bio_integrity_clone - Callback for cloning bios with integrity metadata
|
|
* @bio: New bio
|
|
* @bio_src: Original bio
|
|
* @gfp_mask: Memory allocation mask
|
|
*
|
|
* 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)
|
|
{
|
|
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);
|
|
|
|
if (bip == NULL)
|
|
return -EIO;
|
|
|
|
memcpy(bip->bip_vec, bip_src->bip_vec,
|
|
bip_src->bip_vcnt * sizeof(struct bio_vec));
|
|
|
|
bip->bip_sector = bip_src->bip_sector;
|
|
bip->bip_vcnt = bip_src->bip_vcnt;
|
|
bip->bip_idx = bip_src->bip_idx;
|
|
|
|
return 0;
|
|
}
|
|
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);
|
|
|
|
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 won't block much but may burn a lot of CPU cycles.
|
|
* Make it highpri CPU intensive wq with max concurrency of 1.
|
|
*/
|
|
kintegrityd_wq = alloc_workqueue("kintegrityd", WQ_MEM_RECLAIM |
|
|
WQ_HIGHPRI | WQ_CPU_INTENSIVE, 1);
|
|
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);
|
|
}
|
|
}
|