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_queue *, struct bio *,
29 struct scatterlist *);
30 int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
31
32 static inline bool
33 blk_integrity_queue_supports_integrity(struct request_queue *q)
34 {
35 return q->limits.integrity.tuple_size;
36 }
37
38 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
39 {
40 if (!blk_integrity_queue_supports_integrity(disk->queue))
41 return NULL;
42 return &disk->queue->limits.integrity;
43 }
44
45 static inline struct blk_integrity *
46 bdev_get_integrity(struct block_device *bdev)
47 {
48 return blk_get_integrity(bdev->bd_disk);
49 }
50
51 static inline unsigned short
52 queue_max_integrity_segments(const struct request_queue *q)
53 {
54 return q->limits.max_integrity_segments;
55 }
56
57 /**
58 * bio_integrity_intervals - Return number of integrity intervals for a bio
59 * @bi: blk_integrity profile for device
60 * @sectors: Size of the bio in 512-byte sectors
61 *
62 * Description: The block layer calculates everything in 512 byte
63 * sectors but integrity metadata is done in terms of the data integrity
64 * interval size of the storage device. Convert the block layer sectors
65 * to the appropriate number of integrity intervals.
66 */
67 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
68 unsigned int sectors)
69 {
70 return sectors >> (bi->interval_exp - 9);
71 }
72
73 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
74 unsigned int sectors)
75 {
76 return bio_integrity_intervals(bi, sectors) * bi->tuple_size;
77 }
78
79 static inline bool blk_integrity_rq(struct request *rq)
80 {
81 return rq->cmd_flags & REQ_INTEGRITY;
82 }
83
84 /*
85 * Return the current bvec that contains the integrity data. bip_iter may be
86 * advanced to iterate over the integrity data.
87 */
88 static inline struct bio_vec rq_integrity_vec(struct request *rq)
89 {
90 return mp_bvec_iter_bvec(rq->bio->bi_integrity->bip_vec,
91 rq->bio->bi_integrity->bip_iter);
92 }
93 #else /* CONFIG_BLK_DEV_INTEGRITY */
94 static inline int blk_rq_count_integrity_sg(struct request_queue *q,
95 struct bio *b)
96 {
97 return 0;
98 }
99 static inline int blk_rq_map_integrity_sg(struct request_queue *q,
100 struct bio *b,
101 struct scatterlist *s)
102 {
103 return 0;
104 }
105 static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
106 {
107 return NULL;
108 }
109 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
110 {
111 return NULL;
112 }
113 static inline bool
114 blk_integrity_queue_supports_integrity(struct request_queue *q)
115 {
116 return false;
117 }
118 static inline unsigned short
119 queue_max_integrity_segments(const struct request_queue *q)
120 {
121 return 0;
122 }
123
124 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
125 unsigned int sectors)
126 {
127 return 0;
128 }
129
130 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
131 unsigned int sectors)
132 {
133 return 0;
134 }
135 static inline int blk_integrity_rq(struct request *rq)
136 {
137 return 0;
138 }
139
140 static inline struct bio_vec rq_integrity_vec(struct request *rq)
141 {
142 /* the optimizer will remove all calls to this function */
143 return (struct bio_vec){ };
144 }
145 #endif /* CONFIG_BLK_DEV_INTEGRITY */
146
147 #endif /* _LINUX_BLK_INTEGRITY_H */
148
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