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 #include <linux/bio-integrity.h> 7 8 struct request; 9 10 enum blk_integrity_flags { 11 BLK_INTEGRITY_NOVERIFY = 1 << 0, 12 BLK_INTEGRITY_NOGENERATE = 1 << 1, 13 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, 14 BLK_INTEGRITY_REF_TAG = 1 << 3, 15 BLK_INTEGRITY_STACKED = 1 << 4, 16 }; 17 18 const char *blk_integrity_profile_name(struct blk_integrity *bi); 19 bool queue_limits_stack_integrity(struct queue_limits *t, 20 struct queue_limits *b); 21 static inline bool queue_limits_stack_integrity_bdev(struct queue_limits *t, 22 struct block_device *bdev) 23 { 24 return queue_limits_stack_integrity(t, &bdev->bd_disk->queue->limits); 25 } 26 27 #ifdef CONFIG_BLK_DEV_INTEGRITY 28 int blk_rq_map_integrity_sg(struct request *, struct scatterlist *); 29 int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); 30 int blk_rq_integrity_map_user(struct request *rq, void __user *ubuf, 31 ssize_t bytes, u32 seed); 32 33 static inline bool 34 blk_integrity_queue_supports_integrity(struct request_queue *q) 35 { 36 return q->limits.integrity.tuple_size; 37 } 38 39 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) 40 { 41 if (!blk_integrity_queue_supports_integrity(disk->queue)) 42 return NULL; 43 return &disk->queue->limits.integrity; 44 } 45 46 static inline struct blk_integrity * 47 bdev_get_integrity(struct block_device *bdev) 48 { 49 return blk_get_integrity(bdev->bd_disk); 50 } 51 52 static inline unsigned short 53 queue_max_integrity_segments(const struct request_queue *q) 54 { 55 return q->limits.max_integrity_segments; 56 } 57 58 /** 59 * bio_integrity_intervals - Return number of integrity intervals for a bio 60 * @bi: blk_integrity profile for device 61 * @sectors: Size of the bio in 512-byte sectors 62 * 63 * Description: The block layer calculates everything in 512 byte 64 * sectors but integrity metadata is done in terms of the data integrity 65 * interval size of the storage device. Convert the block layer sectors 66 * to the appropriate number of integrity intervals. 67 */ 68 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, 69 unsigned int sectors) 70 { 71 return sectors >> (bi->interval_exp - 9); 72 } 73 74 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, 75 unsigned int sectors) 76 { 77 return bio_integrity_intervals(bi, sectors) * bi->tuple_size; 78 } 79 80 static inline bool blk_integrity_rq(struct request *rq) 81 { 82 return rq->cmd_flags & REQ_INTEGRITY; 83 } 84 85 /* 86 * Return the current bvec that contains the integrity data. bip_iter may be 87 * advanced to iterate over the integrity data. 88 */ 89 static inline struct bio_vec rq_integrity_vec(struct request *rq) 90 { 91 return mp_bvec_iter_bvec(rq->bio->bi_integrity->bip_vec, 92 rq->bio->bi_integrity->bip_iter); 93 } 94 #else /* CONFIG_BLK_DEV_INTEGRITY */ 95 static inline int blk_rq_count_integrity_sg(struct request_queue *q, 96 struct bio *b) 97 { 98 return 0; 99 } 100 static inline int blk_rq_map_integrity_sg(struct request *q, 101 struct scatterlist *s) 102 { 103 return 0; 104 } 105 static inline int blk_rq_integrity_map_user(struct request *rq, 106 void __user *ubuf, 107 ssize_t bytes, 108 u32 seed) 109 { 110 return -EINVAL; 111 } 112 static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) 113 { 114 return NULL; 115 } 116 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) 117 { 118 return NULL; 119 } 120 static inline bool 121 blk_integrity_queue_supports_integrity(struct request_queue *q) 122 { 123 return false; 124 } 125 static inline unsigned short 126 queue_max_integrity_segments(const struct request_queue *q) 127 { 128 return 0; 129 } 130 131 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, 132 unsigned int sectors) 133 { 134 return 0; 135 } 136 137 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, 138 unsigned int sectors) 139 { 140 return 0; 141 } 142 static inline int blk_integrity_rq(struct request *rq) 143 { 144 return 0; 145 } 146 147 static inline struct bio_vec rq_integrity_vec(struct request *rq) 148 { 149 /* the optimizer will remove all calls to this function */ 150 return (struct bio_vec){ }; 151 } 152 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 153 154 #endif /* _LINUX_BLK_INTEGRITY_H */ 155