Commit 180b2f95 authored by Martin K. Petersen's avatar Martin K. Petersen Committed by Jens Axboe
Browse files

block: Replace bi_integrity with bi_special 



For commands like REQ_COPY we need a way to pass extra information along
with each bio. Like integrity metadata this information must be
available at the bottom of the stack so bi_private does not suffice.

Rename the existing bi_integrity field to bi_special and make it a union
so we can have different bio extensions for each class of command.

We previously used bi_integrity != NULL as a way to identify whether a
bio had integrity metadata or not. Introduce a REQ_INTEGRITY to be the
indicator now that bi_special can contain different things.

In addition, bio_integrity(bio) will now return a pointer to the
integrity payload (when applicable).

Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarSagi Grimberg <sagig@mellanox.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent e7258c1a

Documentation/block/data-integrity.txt

+5 −5
Original line number Diff line number Diff line
@@ -129,11 +129,11 @@ interface for this is being worked on. 
4.1 BIO



The data integrity patches add a new field to struct bio when

CONFIG_BLK_DEV_INTEGRITY is enabled.  bio->bi_integrity is a pointer

to a struct bip which contains the bio integrity payload.  Essentially

a bip is a trimmed down struct bio which holds a bio_vec containing

the integrity metadata and the required housekeeping information (bvec

pool, vector count, etc.)

CONFIG_BLK_DEV_INTEGRITY is enabled.  bio_integrity(bio) returns a

pointer to a struct bip which contains the bio integrity payload.

Essentially a bip is a trimmed down struct bio which holds a bio_vec

containing the integrity metadata and the required housekeeping

information (bvec pool, vector count, etc.)



A kernel subsystem can enable data integrity protection on a bio by

calling bio_integrity_alloc(bio).  This will allocate and attach the

block/bio-integrity.c

+10 −9
Original line number Diff line number Diff line
@@ -79,6 +79,7 @@ struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, 
	bip->bip_slab = idx;

	bip->bip_bio = bio;

	bio->bi_integrity = bip;

	bio->bi_rw |= REQ_INTEGRITY;



	return bip;

err:
@@ -96,7 +97,7 @@ EXPORT_SYMBOL(bio_integrity_alloc); 
 */

void bio_integrity_free(struct bio *bio)

{

	struct bio_integrity_payload *bip = bio->bi_integrity;

	struct bio_integrity_payload *bip = bio_integrity(bio);

	struct bio_set *bs = bio->bi_pool;



	if (bip->bip_owns_buf)
@@ -128,7 +129,7 @@ EXPORT_SYMBOL(bio_integrity_free); 
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_integrity_payload *bip = bio_integrity(bio);

	struct bio_vec *iv;



	if (bip->bip_vcnt >= bip->bip_max_vcnt) {
@@ -229,7 +230,7 @@ EXPORT_SYMBOL(bio_integrity_tag_size); 
static int bio_integrity_tag(struct bio *bio, void *tag_buf, unsigned int len,

			     int set)

{

	struct bio_integrity_payload *bip = bio->bi_integrity;

	struct bio_integrity_payload *bip = bio_integrity(bio);

	struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);

	unsigned int nr_sectors;
@@ -304,12 +305,12 @@ static int bio_integrity_generate_verify(struct bio *bio, int operate) 
	struct bio_vec *bv;

	sector_t sector;

	unsigned int sectors, ret = 0, i;

	void *prot_buf = bio->bi_integrity->bip_buf;

	void *prot_buf = bio_integrity(bio)->bip_buf;



	if (operate)

		sector = bio->bi_iter.bi_sector;

	else

		sector = bio->bi_integrity->bip_iter.bi_sector;

		sector = bio_integrity(bio)->bip_iter.bi_sector;



	bix.disk_name = bio->bi_bdev->bd_disk->disk_name;

	bix.sector_size = bi->sector_size;
@@ -505,7 +506,7 @@ static void bio_integrity_verify_fn(struct work_struct *work) 
 */

void bio_integrity_endio(struct bio *bio, int error)

{

	struct bio_integrity_payload *bip = bio->bi_integrity;

	struct bio_integrity_payload *bip = bio_integrity(bio);



	BUG_ON(bip->bip_bio != bio);
@@ -536,7 +537,7 @@ EXPORT_SYMBOL(bio_integrity_endio); 
 */

void bio_integrity_advance(struct bio *bio, unsigned int bytes_done)

{

	struct bio_integrity_payload *bip = bio->bi_integrity;

	struct bio_integrity_payload *bip = bio_integrity(bio);

	struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);

	unsigned bytes = bio_integrity_bytes(bi, bytes_done >> 9);
@@ -558,7 +559,7 @@ EXPORT_SYMBOL(bio_integrity_advance); 
void bio_integrity_trim(struct bio *bio, unsigned int offset,

			unsigned int sectors)

{

	struct bio_integrity_payload *bip = bio->bi_integrity;

	struct bio_integrity_payload *bip = bio_integrity(bio);

	struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);



	bio_integrity_advance(bio, offset << 9);
@@ -577,7 +578,7 @@ EXPORT_SYMBOL(bio_integrity_trim); 
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_src = bio_integrity(bio_src);

	struct bio_integrity_payload *bip;



	BUG_ON(bip_src == NULL);

drivers/scsi/sd_dif.c

+4 −4
Original line number Diff line number Diff line
@@ -383,9 +383,9 @@ void sd_dif_prepare(struct request *rq, sector_t hw_sector, 
		if (bio_flagged(bio, BIO_MAPPED_INTEGRITY))

			break;



		virt = bio->bi_integrity->bip_iter.bi_sector & 0xffffffff;

		virt = bio_integrity(bio)->bip_iter.bi_sector & 0xffffffff;



		bip_for_each_vec(iv, bio->bi_integrity, iter) {

		bip_for_each_vec(iv, bio_integrity(bio), iter) {

			sdt = kmap_atomic(iv.bv_page)

				+ iv.bv_offset;
@@ -434,9 +434,9 @@ void sd_dif_complete(struct scsi_cmnd *scmd, unsigned int good_bytes) 
		struct bio_vec iv;

		struct bvec_iter iter;



		virt = bio->bi_integrity->bip_iter.bi_sector & 0xffffffff;

		virt = bio_integrity(bio)->bip_iter.bi_sector & 0xffffffff;



		bip_for_each_vec(iv, bio->bi_integrity, iter) {

		bip_for_each_vec(iv, bio_integrity(bio), iter) {

			sdt = kmap_atomic(iv.bv_page)

				+ iv.bv_offset;

include/linux/bio.h

+9 −2
Original line number Diff line number Diff line
@@ -293,6 +293,15 @@ static inline unsigned bio_segments(struct bio *bio) 
#define bio_get(bio)	atomic_inc(&(bio)->bi_cnt)



#if defined(CONFIG_BLK_DEV_INTEGRITY)



static inline struct bio_integrity_payload *bio_integrity(struct bio *bio)

{

	if (bio->bi_rw & REQ_INTEGRITY)

		return bio->bi_integrity;



	return NULL;

}



/*

 * bio integrity payload

 */
@@ -661,8 +670,6 @@ struct biovec_slab { 
	for_each_bio(_bio)						\

		bip_for_each_vec(_bvl, _bio->bi_integrity, _iter)



#define bio_integrity(bio) (bio->bi_integrity != NULL)



extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);

extern void bio_integrity_free(struct bio *);

extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);

include/linux/blk_types.h

+6 −2
Original line number Diff line number Diff line
@@ -78,9 +78,11 @@ struct bio { 
	struct io_context	*bi_ioc;

	struct cgroup_subsys_state *bi_css;

#endif

	union {

#if defined(CONFIG_BLK_DEV_INTEGRITY)

		struct bio_integrity_payload *bi_integrity; /* data integrity */

#endif

	};



	unsigned short		bi_vcnt;	/* how many bio_vec's */
@@ -162,6 +164,7 @@ enum rq_flag_bits { 
	__REQ_WRITE_SAME,	/* write same block many times */



	__REQ_NOIDLE,		/* don't anticipate more IO after this one */

	__REQ_INTEGRITY,	/* I/O includes block integrity payload */

	__REQ_FUA,		/* forced unit access */

	__REQ_FLUSH,		/* request for cache flush */
@@ -203,13 +206,14 @@ enum rq_flag_bits { 
#define REQ_DISCARD		(1ULL << __REQ_DISCARD)

#define REQ_WRITE_SAME		(1ULL << __REQ_WRITE_SAME)

#define REQ_NOIDLE		(1ULL << __REQ_NOIDLE)

#define REQ_INTEGRITY		(1ULL << __REQ_INTEGRITY)



#define REQ_FAILFAST_MASK \

	(REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)

#define REQ_COMMON_MASK \

	(REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | \

	 REQ_DISCARD | REQ_WRITE_SAME | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | \

	 REQ_SECURE)

	 REQ_SECURE | REQ_INTEGRITY)

#define REQ_CLONE_MASK		REQ_COMMON_MASK



#define BIO_NO_ADVANCE_ITER_MASK	(REQ_DISCARD|REQ_WRITE_SAME)

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