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183 lines
4.6 KiB
183 lines
4.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_BLK_INTEGRITY_H |
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#define _LINUX_BLK_INTEGRITY_H |
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#include <linux/blk-mq.h> |
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struct request; |
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enum blk_integrity_flags { |
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BLK_INTEGRITY_VERIFY = 1 << 0, |
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BLK_INTEGRITY_GENERATE = 1 << 1, |
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BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, |
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BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, |
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}; |
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struct blk_integrity_iter { |
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void *prot_buf; |
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void *data_buf; |
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sector_t seed; |
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unsigned int data_size; |
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unsigned short interval; |
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const char *disk_name; |
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}; |
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typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *); |
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typedef void (integrity_prepare_fn) (struct request *); |
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typedef void (integrity_complete_fn) (struct request *, unsigned int); |
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struct blk_integrity_profile { |
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integrity_processing_fn *generate_fn; |
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integrity_processing_fn *verify_fn; |
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integrity_prepare_fn *prepare_fn; |
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integrity_complete_fn *complete_fn; |
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const char *name; |
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}; |
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#ifdef CONFIG_BLK_DEV_INTEGRITY |
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void blk_integrity_register(struct gendisk *, struct blk_integrity *); |
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void blk_integrity_unregister(struct gendisk *); |
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int blk_integrity_compare(struct gendisk *, struct gendisk *); |
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int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
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struct scatterlist *); |
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int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); |
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static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
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{ |
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struct blk_integrity *bi = &disk->queue->integrity; |
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if (!bi->profile) |
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return NULL; |
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return bi; |
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} |
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static inline struct blk_integrity * |
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bdev_get_integrity(struct block_device *bdev) |
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{ |
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return blk_get_integrity(bdev->bd_disk); |
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} |
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static inline bool |
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blk_integrity_queue_supports_integrity(struct request_queue *q) |
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{ |
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return q->integrity.profile; |
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} |
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static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
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unsigned int segs) |
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{ |
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q->limits.max_integrity_segments = segs; |
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} |
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static inline unsigned short |
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queue_max_integrity_segments(const struct request_queue *q) |
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{ |
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return q->limits.max_integrity_segments; |
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} |
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/** |
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* bio_integrity_intervals - Return number of integrity intervals for a bio |
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* @bi: blk_integrity profile for device |
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* @sectors: Size of the bio in 512-byte sectors |
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* |
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* Description: The block layer calculates everything in 512 byte |
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* sectors but integrity metadata is done in terms of the data integrity |
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* interval size of the storage device. Convert the block layer sectors |
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* to the appropriate number of integrity intervals. |
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*/ |
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static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, |
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unsigned int sectors) |
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{ |
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return sectors >> (bi->interval_exp - 9); |
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} |
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static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, |
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unsigned int sectors) |
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{ |
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return bio_integrity_intervals(bi, sectors) * bi->tuple_size; |
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} |
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static inline bool blk_integrity_rq(struct request *rq) |
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{ |
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return rq->cmd_flags & REQ_INTEGRITY; |
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} |
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/* |
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* Return the first bvec that contains integrity data. Only drivers that are |
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* limited to a single integrity segment should use this helper. |
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*/ |
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static inline struct bio_vec *rq_integrity_vec(struct request *rq) |
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{ |
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if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1)) |
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return NULL; |
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return rq->bio->bi_integrity->bip_vec; |
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} |
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#else /* CONFIG_BLK_DEV_INTEGRITY */ |
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static inline int blk_rq_count_integrity_sg(struct request_queue *q, |
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struct bio *b) |
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{ |
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return 0; |
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} |
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static inline int blk_rq_map_integrity_sg(struct request_queue *q, |
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struct bio *b, |
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struct scatterlist *s) |
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{ |
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return 0; |
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} |
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static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) |
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{ |
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return NULL; |
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} |
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static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
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{ |
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return NULL; |
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} |
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static inline bool |
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blk_integrity_queue_supports_integrity(struct request_queue *q) |
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{ |
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return false; |
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} |
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static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) |
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{ |
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return 0; |
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} |
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static inline void blk_integrity_register(struct gendisk *d, |
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struct blk_integrity *b) |
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{ |
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} |
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static inline void blk_integrity_unregister(struct gendisk *d) |
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{ |
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} |
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static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
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unsigned int segs) |
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{ |
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} |
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static inline unsigned short |
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queue_max_integrity_segments(const struct request_queue *q) |
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{ |
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return 0; |
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} |
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static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, |
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unsigned int sectors) |
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{ |
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return 0; |
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} |
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static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, |
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unsigned int sectors) |
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{ |
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return 0; |
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} |
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static inline int blk_integrity_rq(struct request *rq) |
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{ |
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return 0; |
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} |
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static inline struct bio_vec *rq_integrity_vec(struct request *rq) |
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{ |
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return NULL; |
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} |
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#endif /* CONFIG_BLK_DEV_INTEGRITY */ |
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#endif /* _LINUX_BLK_INTEGRITY_H */
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