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author | Martin K. Petersen <martin.petersen@oracle.com> | 2014-09-26 19:19:56 -0400 |
---|---|---|
committer | Jens Axboe <axboe@fb.com> | 2014-09-27 09:14:46 -0600 |
commit | 180b2f95dd331010a9930a65c8a18d6d81b94dc1 (patch) | |
tree | 8ceb4a28e15e1e588b52022a844f81daabd0f92d | |
parent | e7258c1a269e0967856c81d182c286a78f5ecf15 (diff) | |
download | lwn-180b2f95dd331010a9930a65c8a18d6d81b94dc1.tar.gz lwn-180b2f95dd331010a9930a65c8a18d6d81b94dc1.zip |
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: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
-rw-r--r-- | Documentation/block/data-integrity.txt | 10 | ||||
-rw-r--r-- | block/bio-integrity.c | 19 | ||||
-rw-r--r-- | drivers/scsi/sd_dif.c | 8 | ||||
-rw-r--r-- | include/linux/bio.h | 11 | ||||
-rw-r--r-- | include/linux/blk_types.h | 8 | ||||
-rw-r--r-- | include/linux/blkdev.h | 7 |
6 files changed, 36 insertions, 27 deletions
diff --git a/Documentation/block/data-integrity.txt b/Documentation/block/data-integrity.txt index b4eacf48053c..4d4de8b09530 100644 --- a/Documentation/block/data-integrity.txt +++ b/Documentation/block/data-integrity.txt @@ -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 diff --git a/block/bio-integrity.c b/block/bio-integrity.c index 36b788552c3e..bd3125c3c124 100644 --- a/block/bio-integrity.c +++ b/block/bio-integrity.c @@ -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); diff --git a/drivers/scsi/sd_dif.c b/drivers/scsi/sd_dif.c index a7a691d0af7d..29f0477a8708 100644 --- a/drivers/scsi/sd_dif.c +++ b/drivers/scsi/sd_dif.c @@ -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; diff --git a/include/linux/bio.h b/include/linux/bio.h index 63e399b4fde5..a810a74071b2 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -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); diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index bb7d66460e7a..6a5d2f2de1b9 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -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 */ + 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) diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 49f3461e4272..7fcb2caef559 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1514,12 +1514,9 @@ static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) return disk->integrity; } -static inline int blk_integrity_rq(struct request *rq) +static inline bool blk_integrity_rq(struct request *rq) { - if (rq->bio == NULL) - return 0; - - return bio_integrity(rq->bio); + return rq->cmd_flags & REQ_INTEGRITY; } static inline void blk_queue_max_integrity_segments(struct request_queue *q, |