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e9f5f44ad3
Block layer integrity configuration is a bit complex right now, as it indirects through operation vectors for a simple two-dimensional configuration: a) the checksum type of none, ip checksum, crc, crc64 b) the presence or absence of a reference tag Remove the integrity profile, and instead add a separate csum_type flag which replaces the existing ip-checksum field and a new flag that indicates the presence of the reference tag. This removes up to two layers of indirect calls, remove the need to offload the no-op verification of non-PI metadata to a workqueue and generally simplifies the code. The downside is that block/t10-pi.c now has to be built into the kernel when CONFIG_BLK_DEV_INTEGRITY is supported. Given that both nvme and SCSI require t10-pi.ko, it is loaded for all usual configurations that enabled CONFIG_BLK_DEV_INTEGRITY already, though. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Kanchan Joshi <joshi.k@samsung.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Link: https://lore.kernel.org/r/20240613084839.1044015-6-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
161 lines
4.0 KiB
C
161 lines
4.0 KiB
C
/* 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_REF_TAG = 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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const char *blk_integrity_profile_name(struct blk_integrity *bi);
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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 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.tuple_size;
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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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if (!blk_integrity_queue_supports_integrity(disk->queue))
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return NULL;
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return &disk->queue->integrity;
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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 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 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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