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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);
32int blk_get_meta_cap(struct block_device *bdev, unsigned int cmd,
33 struct logical_block_metadata_cap __user *argp);
34
35static inline bool
36blk_integrity_queue_supports_integrity(struct request_queue *q)
37{
38 return q->limits.integrity.metadata_size;
39}
40
41static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
42{
43 if (!blk_integrity_queue_supports_integrity(disk->queue))
44 return NULL;
45 return &disk->queue->limits.integrity;
46}
47
48static inline struct blk_integrity *
49bdev_get_integrity(struct block_device *bdev)
50{
51 return blk_get_integrity(bdev->bd_disk);
52}
53
54static inline unsigned short
55queue_max_integrity_segments(const struct request_queue *q)
56{
57 return q->limits.max_integrity_segments;
58}
59
60/**
61 * bio_integrity_intervals - Return number of integrity intervals for a bio
62 * @bi: blk_integrity profile for device
63 * @sectors: Size of the bio in 512-byte sectors
64 *
65 * Description: The block layer calculates everything in 512 byte
66 * sectors but integrity metadata is done in terms of the data integrity
67 * interval size of the storage device. Convert the block layer sectors
68 * to the appropriate number of integrity intervals.
69 */
70static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
71 unsigned int sectors)
72{
73 return sectors >> (bi->interval_exp - 9);
74}
75
76static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
77 unsigned int sectors)
78{
79 return bio_integrity_intervals(bi, sectors) * bi->metadata_size;
80}
81
82static inline bool blk_integrity_rq(struct request *rq)
83{
84 return rq->cmd_flags & REQ_INTEGRITY;
85}
86
87/*
88 * Return the current bvec that contains the integrity data. bip_iter may be
89 * advanced to iterate over the integrity data.
90 */
91static inline struct bio_vec rq_integrity_vec(struct request *rq)
92{
93 return mp_bvec_iter_bvec(rq->bio->bi_integrity->bip_vec,
94 rq->bio->bi_integrity->bip_iter);
95}
96#else /* CONFIG_BLK_DEV_INTEGRITY */
97static inline int blk_get_meta_cap(struct block_device *bdev, unsigned int cmd,
98 struct logical_block_metadata_cap __user *argp)
99{
100 return -ENOIOCTLCMD;
101}
102static inline int blk_rq_count_integrity_sg(struct request_queue *q,
103 struct bio *b)
104{
105 return 0;
106}
107static inline int blk_rq_map_integrity_sg(struct request *q,
108 struct scatterlist *s)
109{
110 return 0;
111}
112static inline int blk_rq_integrity_map_user(struct request *rq,
113 void __user *ubuf,
114 ssize_t bytes)
115{
116 return -EINVAL;
117}
118static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
119{
120 return NULL;
121}
122static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
123{
124 return NULL;
125}
126static inline bool
127blk_integrity_queue_supports_integrity(struct request_queue *q)
128{
129 return false;
130}
131static inline unsigned short
132queue_max_integrity_segments(const struct request_queue *q)
133{
134 return 0;
135}
136
137static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
138 unsigned int sectors)
139{
140 return 0;
141}
142
143static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
144 unsigned int sectors)
145{
146 return 0;
147}
148static inline int blk_integrity_rq(struct request *rq)
149{
150 return 0;
151}
152
153static inline struct bio_vec rq_integrity_vec(struct request *rq)
154{
155 /* the optimizer will remove all calls to this function */
156 return (struct bio_vec){ };
157}
158#endif /* CONFIG_BLK_DEV_INTEGRITY */
159
160#endif /* _LINUX_BLK_INTEGRITY_H */