| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _LINUX_BLK_INTEGRITY_H |
| #define _LINUX_BLK_INTEGRITY_H |
| |
| #include <linux/blk-mq.h> |
| |
| struct request; |
| |
| enum blk_integrity_flags { |
| BLK_INTEGRITY_NOVERIFY = 1 << 0, |
| BLK_INTEGRITY_NOGENERATE = 1 << 1, |
| BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, |
| BLK_INTEGRITY_REF_TAG = 1 << 3, |
| BLK_INTEGRITY_STACKED = 1 << 4, |
| }; |
| |
| struct blk_integrity_iter { |
| void *prot_buf; |
| void *data_buf; |
| sector_t seed; |
| unsigned int data_size; |
| unsigned short interval; |
| const char *disk_name; |
| }; |
| |
| const char *blk_integrity_profile_name(struct blk_integrity *bi); |
| bool queue_limits_stack_integrity(struct queue_limits *t, |
| struct queue_limits *b); |
| static inline bool queue_limits_stack_integrity_bdev(struct queue_limits *t, |
| struct block_device *bdev) |
| { |
| return queue_limits_stack_integrity(t, &bdev->bd_disk->queue->limits); |
| } |
| |
| #ifdef CONFIG_BLK_DEV_INTEGRITY |
| int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
| struct scatterlist *); |
| int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); |
| |
| static inline bool |
| blk_integrity_queue_supports_integrity(struct request_queue *q) |
| { |
| return q->limits.integrity.tuple_size; |
| } |
| |
| static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
| { |
| if (!blk_integrity_queue_supports_integrity(disk->queue)) |
| return NULL; |
| return &disk->queue->limits.integrity; |
| } |
| |
| static inline struct blk_integrity * |
| bdev_get_integrity(struct block_device *bdev) |
| { |
| return blk_get_integrity(bdev->bd_disk); |
| } |
| |
| static inline unsigned short |
| queue_max_integrity_segments(const struct request_queue *q) |
| { |
| return q->limits.max_integrity_segments; |
| } |
| |
| /** |
| * bio_integrity_intervals - Return number of integrity intervals for a bio |
| * @bi: blk_integrity profile for device |
| * @sectors: Size of the bio in 512-byte sectors |
| * |
| * Description: The block layer calculates everything in 512 byte |
| * sectors but integrity metadata is done in terms of the data integrity |
| * interval size of the storage device. Convert the block layer sectors |
| * to the appropriate number of integrity intervals. |
| */ |
| static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, |
| unsigned int sectors) |
| { |
| return sectors >> (bi->interval_exp - 9); |
| } |
| |
| static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, |
| unsigned int sectors) |
| { |
| return bio_integrity_intervals(bi, sectors) * bi->tuple_size; |
| } |
| |
| static inline bool blk_integrity_rq(struct request *rq) |
| { |
| return rq->cmd_flags & REQ_INTEGRITY; |
| } |
| |
| /* |
| * Return the current bvec that contains the integrity data. bip_iter may be |
| * advanced to iterate over the integrity data. |
| */ |
| static inline struct bio_vec rq_integrity_vec(struct request *rq) |
| { |
| return mp_bvec_iter_bvec(rq->bio->bi_integrity->bip_vec, |
| rq->bio->bi_integrity->bip_iter); |
| } |
| #else /* CONFIG_BLK_DEV_INTEGRITY */ |
| static inline int blk_rq_count_integrity_sg(struct request_queue *q, |
| struct bio *b) |
| { |
| return 0; |
| } |
| static inline int blk_rq_map_integrity_sg(struct request_queue *q, |
| struct bio *b, |
| struct scatterlist *s) |
| { |
| return 0; |
| } |
| static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) |
| { |
| return NULL; |
| } |
| static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
| { |
| return NULL; |
| } |
| static inline bool |
| blk_integrity_queue_supports_integrity(struct request_queue *q) |
| { |
| return false; |
| } |
| static inline unsigned short |
| queue_max_integrity_segments(const struct request_queue *q) |
| { |
| return 0; |
| } |
| |
| static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, |
| unsigned int sectors) |
| { |
| return 0; |
| } |
| |
| static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, |
| unsigned int sectors) |
| { |
| return 0; |
| } |
| static inline int blk_integrity_rq(struct request *rq) |
| { |
| return 0; |
| } |
| |
| static inline struct bio_vec *rq_integrity_vec(struct request *rq) |
| { |
| /* the optimizer will remove all calls to this function */ |
| return (struct bio_vec){ }; |
| } |
| #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| |
| #endif /* _LINUX_BLK_INTEGRITY_H */ |