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);
queue_limits_stack_integrity_bdev(struct queue_limits * t,struct block_device * bdev)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
blk_integrity_queue_supports_integrity(struct request_queue * q)34 blk_integrity_queue_supports_integrity(struct request_queue *q)
35 {
36 return q->limits.integrity.tuple_size;
37 }
38
blk_get_integrity(struct gendisk * disk)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 *
bdev_get_integrity(struct block_device * bdev)47 bdev_get_integrity(struct block_device *bdev)
48 {
49 return blk_get_integrity(bdev->bd_disk);
50 }
51
52 static inline unsigned short
queue_max_integrity_segments(const struct request_queue * q)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 */
bio_integrity_intervals(struct blk_integrity * bi,unsigned int sectors)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
bio_integrity_bytes(struct blk_integrity * bi,unsigned int sectors)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
blk_integrity_rq(struct request * rq)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 */
rq_integrity_vec(struct request * rq)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 */
blk_rq_count_integrity_sg(struct request_queue * q,struct bio * b)95 static inline int blk_rq_count_integrity_sg(struct request_queue *q,
96 struct bio *b)
97 {
98 return 0;
99 }
blk_rq_map_integrity_sg(struct request * q,struct scatterlist * s)100 static inline int blk_rq_map_integrity_sg(struct request *q,
101 struct scatterlist *s)
102 {
103 return 0;
104 }
blk_rq_integrity_map_user(struct request * rq,void __user * ubuf,ssize_t bytes,u32 seed)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 }
bdev_get_integrity(struct block_device * b)112 static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
113 {
114 return NULL;
115 }
blk_get_integrity(struct gendisk * disk)116 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
117 {
118 return NULL;
119 }
120 static inline bool
blk_integrity_queue_supports_integrity(struct request_queue * q)121 blk_integrity_queue_supports_integrity(struct request_queue *q)
122 {
123 return false;
124 }
125 static inline unsigned short
queue_max_integrity_segments(const struct request_queue * q)126 queue_max_integrity_segments(const struct request_queue *q)
127 {
128 return 0;
129 }
130
bio_integrity_intervals(struct blk_integrity * bi,unsigned int sectors)131 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
132 unsigned int sectors)
133 {
134 return 0;
135 }
136
bio_integrity_bytes(struct blk_integrity * bi,unsigned int sectors)137 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
138 unsigned int sectors)
139 {
140 return 0;
141 }
blk_integrity_rq(struct request * rq)142 static inline int blk_integrity_rq(struct request *rq)
143 {
144 return 0;
145 }
146
rq_integrity_vec(struct request * rq)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