Linux kernel mirror (for testing)
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linux
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_queue *, struct bio *,
29 struct scatterlist *);
30int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
31
32static inline bool
33blk_integrity_queue_supports_integrity(struct request_queue *q)
34{
35 return q->limits.integrity.tuple_size;
36}
37
38static 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
45static inline struct blk_integrity *
46bdev_get_integrity(struct block_device *bdev)
47{
48 return blk_get_integrity(bdev->bd_disk);
49}
50
51static inline unsigned short
52queue_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 */
67static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
68 unsigned int sectors)
69{
70 return sectors >> (bi->interval_exp - 9);
71}
72
73static 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
79static 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 */
88static 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 */
94static inline int blk_rq_count_integrity_sg(struct request_queue *q,
95 struct bio *b)
96{
97 return 0;
98}
99static inline int blk_rq_map_integrity_sg(struct request_queue *q,
100 struct bio *b,
101 struct scatterlist *s)
102{
103 return 0;
104}
105static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
106{
107 return NULL;
108}
109static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
110{
111 return NULL;
112}
113static inline bool
114blk_integrity_queue_supports_integrity(struct request_queue *q)
115{
116 return false;
117}
118static inline unsigned short
119queue_max_integrity_segments(const struct request_queue *q)
120{
121 return 0;
122}
123
124static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
125 unsigned int sectors)
126{
127 return 0;
128}
129
130static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
131 unsigned int sectors)
132{
133 return 0;
134}
135static inline int blk_integrity_rq(struct request *rq)
136{
137 return 0;
138}
139
140static 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 */