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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
8struct request;
9
10enum 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
18const char *blk_integrity_profile_name(struct blk_integrity *bi);
19bool queue_limits_stack_integrity(struct queue_limits *t,
20 struct queue_limits *b);
21static 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
28int blk_rq_map_integrity_sg(struct request *, struct scatterlist *);
29int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
30int blk_rq_integrity_map_user(struct request *rq, void __user *ubuf,
31 ssize_t bytes, u32 seed);
32
33static inline bool
34blk_integrity_queue_supports_integrity(struct request_queue *q)
35{
36 return q->limits.integrity.tuple_size;
37}
38
39static 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
46static inline struct blk_integrity *
47bdev_get_integrity(struct block_device *bdev)
48{
49 return blk_get_integrity(bdev->bd_disk);
50}
51
52static inline unsigned short
53queue_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 */
68static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
69 unsigned int sectors)
70{
71 return sectors >> (bi->interval_exp - 9);
72}
73
74static 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
80static 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 */
89static 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 */
95static inline int blk_rq_count_integrity_sg(struct request_queue *q,
96 struct bio *b)
97{
98 return 0;
99}
100static inline int blk_rq_map_integrity_sg(struct request *q,
101 struct scatterlist *s)
102{
103 return 0;
104}
105static 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}
112static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
113{
114 return NULL;
115}
116static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
117{
118 return NULL;
119}
120static inline bool
121blk_integrity_queue_supports_integrity(struct request_queue *q)
122{
123 return false;
124}
125static inline unsigned short
126queue_max_integrity_segments(const struct request_queue *q)
127{
128 return 0;
129}
130
131static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
132 unsigned int sectors)
133{
134 return 0;
135}
136
137static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
138 unsigned int sectors)
139{
140 return 0;
141}
142static inline int blk_integrity_rq(struct request *rq)
143{
144 return 0;
145}
146
147static 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 */