1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_BLK_INTEGRITY_H 3 #define _LINUX_BLK_INTEGRITY_H 4 5 #include <linux/blk-mq.h> 6 7 struct request; 8 9 enum blk_integrity_flags { 10 BLK_INTEGRITY_NOVERIFY = 1 << 0, 11 BLK_INTEGRITY_NOGENERATE = 1 << 1, 12 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, 13 BLK_INTEGRITY_REF_TAG = 1 << 3, 14 BLK_INTEGRITY_STACKED = 1 << 4, 15 }; 16 17 const char *blk_integrity_profile_name(struct blk_integrity *bi); 18 bool queue_limits_stack_integrity(struct queue_limits *t, 19 struct queue_limits *b); 20 static inline bool queue_limits_stack_integrity_bdev(struct queue_limits *t, 21 struct block_device *bdev) 22 { 23 return queue_limits_stack_integrity(t, &bdev->bd_disk->queue->limits); 24 } 25 26 #ifdef CONFIG_BLK_DEV_INTEGRITY 27 int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, 28 struct scatterlist *); 29 int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); 30 31 static inline bool 32 blk_integrity_queue_supports_integrity(struct request_queue *q) 33 { 34 return q->limits.integrity.tuple_size; 35 } 36 37 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) 38 { 39 if (!blk_integrity_queue_supports_integrity(disk->queue)) 40 return NULL; 41 return &disk->queue->limits.integrity; 42 } 43 44 static inline struct blk_integrity * 45 bdev_get_integrity(struct block_device *bdev) 46 { 47 return blk_get_integrity(bdev->bd_disk); 48 } 49 50 static inline unsigned short 51 queue_max_integrity_segments(const struct request_queue *q) 52 { 53 return q->limits.max_integrity_segments; 54 } 55 56 /** 57 * bio_integrity_intervals - Return number of integrity intervals for a bio 58 * @bi: blk_integrity profile for device 59 * @sectors: Size of the bio in 512-byte sectors 60 * 61 * Description: The block layer calculates everything in 512 byte 62 * sectors but integrity metadata is done in terms of the data integrity 63 * interval size of the storage device. Convert the block layer sectors 64 * to the appropriate number of integrity intervals. 65 */ 66 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, 67 unsigned int sectors) 68 { 69 return sectors >> (bi->interval_exp - 9); 70 } 71 72 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, 73 unsigned int sectors) 74 { 75 return bio_integrity_intervals(bi, sectors) * bi->tuple_size; 76 } 77 78 static inline bool blk_integrity_rq(struct request *rq) 79 { 80 return rq->cmd_flags & REQ_INTEGRITY; 81 } 82 83 /* 84 * Return the current bvec that contains the integrity data. bip_iter may be 85 * advanced to iterate over the integrity data. 86 */ 87 static inline struct bio_vec rq_integrity_vec(struct request *rq) 88 { 89 return mp_bvec_iter_bvec(rq->bio->bi_integrity->bip_vec, 90 rq->bio->bi_integrity->bip_iter); 91 } 92 #else /* CONFIG_BLK_DEV_INTEGRITY */ 93 static inline int blk_rq_count_integrity_sg(struct request_queue *q, 94 struct bio *b) 95 { 96 return 0; 97 } 98 static inline int blk_rq_map_integrity_sg(struct request_queue *q, 99 struct bio *b, 100 struct scatterlist *s) 101 { 102 return 0; 103 } 104 static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) 105 { 106 return NULL; 107 } 108 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) 109 { 110 return NULL; 111 } 112 static inline bool 113 blk_integrity_queue_supports_integrity(struct request_queue *q) 114 { 115 return false; 116 } 117 static inline unsigned short 118 queue_max_integrity_segments(const struct request_queue *q) 119 { 120 return 0; 121 } 122 123 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, 124 unsigned int sectors) 125 { 126 return 0; 127 } 128 129 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, 130 unsigned int sectors) 131 { 132 return 0; 133 } 134 static inline int blk_integrity_rq(struct request *rq) 135 { 136 return 0; 137 } 138 139 static inline struct bio_vec rq_integrity_vec(struct request *rq) 140 { 141 /* the optimizer will remove all calls to this function */ 142 return (struct bio_vec){ }; 143 } 144 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 145 146 #endif /* _LINUX_BLK_INTEGRITY_H */ 147