From 3be91c4a3d090bd700bd6ee5bf457c1bbf189a4f Mon Sep 17 00:00:00 2001 From: "Martin K. Petersen" Date: Fri, 26 Sep 2014 19:19:59 -0400 Subject: [PATCH] block: Deprecate the use of the term sector in the context of block integrity The protection interval is not necessarily tied to the logical block size of a block device. Stop using the terms "sector" and "sectors". Going forward we will use the term "seed" to describe the initial reference tag value for a given I/O. "Interval" will be used to describe the portion of the data buffer that a given piece of protection information is associated with. Signed-off-by: Martin K. Petersen Reviewed-by: Christoph Hellwig Reviewed-by: Sagi Grimberg Signed-off-by: Jens Axboe --- block/bio-integrity.c | 42 +++++++++++++++++++------------------- block/blk-integrity.c | 10 ++++----- drivers/scsi/sd_dif.c | 46 +++++++++++++++++++++--------------------- include/linux/blkdev.h | 6 +++--- 4 files changed, 52 insertions(+), 52 deletions(-) diff --git a/block/bio-integrity.c b/block/bio-integrity.c index e84f7fb8694b..6a3aacf57b19 100644 --- a/block/bio-integrity.c +++ b/block/bio-integrity.c @@ -185,20 +185,20 @@ bool bio_integrity_enabled(struct bio *bio) EXPORT_SYMBOL(bio_integrity_enabled); /** - * bio_integrity_hw_sectors - Convert 512b sectors to hardware ditto + * bio_integrity_intervals - Return number of integrity intervals for a bio * @bi: blk_integrity profile for device - * @sectors: Number of 512 sectors to convert + * @sectors: Size of the bio in 512-byte sectors * * Description: The block layer calculates everything in 512 byte - * sectors but integrity metadata is done in terms of the hardware - * sector size of the storage device. Convert the block layer sectors - * to physical sectors. + * sectors but integrity metadata is done in terms of the data integrity + * interval size of the storage device. Convert the block layer sectors + * to the appropriate number of integrity intervals. */ -static inline unsigned int bio_integrity_hw_sectors(struct blk_integrity *bi, - unsigned int sectors) +static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, + unsigned int sectors) { /* At this point there are only 512b or 4096b DIF/EPP devices */ - if (bi->sector_size == 4096) + if (bi->interval == 4096) return sectors >>= 3; return sectors; @@ -207,7 +207,7 @@ static inline unsigned int bio_integrity_hw_sectors(struct blk_integrity *bi, static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, unsigned int sectors) { - return bio_integrity_hw_sectors(bi, sectors) * bi->tuple_size; + return bio_integrity_intervals(bi, sectors) * bi->tuple_size; } /** @@ -221,25 +221,25 @@ static int bio_integrity_generate_verify(struct bio *bio, int operate) struct blk_integrity_exchg bix; struct bio_vec *bv; struct bio_integrity_payload *bip = bio_integrity(bio); - sector_t sector; - unsigned int sectors, ret = 0, i; + sector_t seed; + unsigned int intervals, ret = 0, i; void *prot_buf = page_address(bip->bip_vec->bv_page) + bip->bip_vec->bv_offset; if (operate) - sector = bio->bi_iter.bi_sector; + seed = bio->bi_iter.bi_sector; else - sector = bip->bip_iter.bi_sector; + seed = bip->bip_iter.bi_sector; bix.disk_name = bio->bi_bdev->bd_disk->disk_name; - bix.sector_size = bi->sector_size; + bix.interval = bi->interval; bio_for_each_segment_all(bv, bio, i) { void *kaddr = kmap_atomic(bv->bv_page); bix.data_buf = kaddr + bv->bv_offset; bix.data_size = bv->bv_len; bix.prot_buf = prot_buf; - bix.sector = sector; + bix.seed = seed; if (operate) bi->generate_fn(&bix); @@ -251,9 +251,9 @@ static int bio_integrity_generate_verify(struct bio *bio, int operate) } } - sectors = bv->bv_len / bi->sector_size; - sector += sectors; - prot_buf += sectors * bi->tuple_size; + intervals = bv->bv_len / bi->interval; + seed += intervals; + prot_buf += intervals * bi->tuple_size; kunmap_atomic(kaddr); } @@ -294,17 +294,17 @@ int bio_integrity_prep(struct bio *bio) unsigned long start, end; unsigned int len, nr_pages; unsigned int bytes, offset, i; - unsigned int sectors; + unsigned int intervals; bi = bdev_get_integrity(bio->bi_bdev); q = bdev_get_queue(bio->bi_bdev); BUG_ON(bi == NULL); BUG_ON(bio_integrity(bio)); - sectors = bio_integrity_hw_sectors(bi, bio_sectors(bio)); + intervals = bio_integrity_intervals(bi, bio_sectors(bio)); /* Allocate kernel buffer for protection data */ - len = sectors * bi->tuple_size; + len = intervals * bi->tuple_size; buf = kmalloc(len, GFP_NOIO | q->bounce_gfp); if (unlikely(buf == NULL)) { printk(KERN_ERR "could not allocate integrity buffer\n"); diff --git a/block/blk-integrity.c b/block/blk-integrity.c index 7ac17160ab69..3a83a7d08177 100644 --- a/block/blk-integrity.c +++ b/block/blk-integrity.c @@ -154,10 +154,10 @@ int blk_integrity_compare(struct gendisk *gd1, struct gendisk *gd2) if (!b1 || !b2) return -1; - if (b1->sector_size != b2->sector_size) { - printk(KERN_ERR "%s: %s/%s sector sz %u != %u\n", __func__, - gd1->disk_name, gd2->disk_name, - b1->sector_size, b2->sector_size); + if (b1->interval != b2->interval) { + pr_err("%s: %s/%s protection interval %u != %u\n", + __func__, gd1->disk_name, gd2->disk_name, + b1->interval, b2->interval); return -1; } @@ -407,7 +407,7 @@ int blk_integrity_register(struct gendisk *disk, struct blk_integrity *template) kobject_uevent(&bi->kobj, KOBJ_ADD); bi->flags |= INTEGRITY_FLAG_READ | INTEGRITY_FLAG_WRITE; - bi->sector_size = queue_logical_block_size(disk->queue); + bi->interval = queue_logical_block_size(disk->queue); disk->integrity = bi; } else bi = disk->integrity; diff --git a/drivers/scsi/sd_dif.c b/drivers/scsi/sd_dif.c index 38a7778631be..1600270a46e5 100644 --- a/drivers/scsi/sd_dif.c +++ b/drivers/scsi/sd_dif.c @@ -57,16 +57,16 @@ static void sd_dif_type1_generate(struct blk_integrity_exchg *bix, csum_fn *fn) { void *buf = bix->data_buf; struct sd_dif_tuple *sdt = bix->prot_buf; - sector_t sector = bix->sector; + sector_t seed = bix->seed; unsigned int i; - for (i = 0 ; i < bix->data_size ; i += bix->sector_size, sdt++) { - sdt->guard_tag = fn(buf, bix->sector_size); - sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); + for (i = 0 ; i < bix->data_size ; i += bix->interval, sdt++) { + sdt->guard_tag = fn(buf, bix->interval); + sdt->ref_tag = cpu_to_be32(seed & 0xffffffff); sdt->app_tag = 0; - buf += bix->sector_size; - sector++; + buf += bix->interval; + seed++; } } @@ -84,35 +84,35 @@ static int sd_dif_type1_verify(struct blk_integrity_exchg *bix, csum_fn *fn) { void *buf = bix->data_buf; struct sd_dif_tuple *sdt = bix->prot_buf; - sector_t sector = bix->sector; + sector_t seed = bix->seed; unsigned int i; __u16 csum; - for (i = 0 ; i < bix->data_size ; i += bix->sector_size, sdt++) { + for (i = 0 ; i < bix->data_size ; i += bix->interval, sdt++) { /* Unwritten sectors */ if (sdt->app_tag == 0xffff) return 0; - if (be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { + if (be32_to_cpu(sdt->ref_tag) != (seed & 0xffffffff)) { printk(KERN_ERR "%s: ref tag error on sector %lu (rcvd %u)\n", - bix->disk_name, (unsigned long)sector, + bix->disk_name, (unsigned long)seed, be32_to_cpu(sdt->ref_tag)); return -EIO; } - csum = fn(buf, bix->sector_size); + csum = fn(buf, bix->interval); if (sdt->guard_tag != csum) { printk(KERN_ERR "%s: guard tag error on sector %lu " \ "(rcvd %04x, data %04x)\n", bix->disk_name, - (unsigned long)sector, + (unsigned long)seed, be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); return -EIO; } - buf += bix->sector_size; - sector++; + buf += bix->interval; + seed++; } return 0; @@ -155,12 +155,12 @@ static void sd_dif_type3_generate(struct blk_integrity_exchg *bix, csum_fn *fn) struct sd_dif_tuple *sdt = bix->prot_buf; unsigned int i; - for (i = 0 ; i < bix->data_size ; i += bix->sector_size, sdt++) { - sdt->guard_tag = fn(buf, bix->sector_size); + for (i = 0 ; i < bix->data_size ; i += bix->interval, sdt++) { + sdt->guard_tag = fn(buf, bix->interval); sdt->ref_tag = 0; sdt->app_tag = 0; - buf += bix->sector_size; + buf += bix->interval; } } @@ -178,27 +178,27 @@ static int sd_dif_type3_verify(struct blk_integrity_exchg *bix, csum_fn *fn) { void *buf = bix->data_buf; struct sd_dif_tuple *sdt = bix->prot_buf; - sector_t sector = bix->sector; + sector_t seed = bix->seed; unsigned int i; __u16 csum; - for (i = 0 ; i < bix->data_size ; i += bix->sector_size, sdt++) { + for (i = 0 ; i < bix->data_size ; i += bix->interval, sdt++) { /* Unwritten sectors */ if (sdt->app_tag == 0xffff && sdt->ref_tag == 0xffffffff) return 0; - csum = fn(buf, bix->sector_size); + csum = fn(buf, bix->interval); if (sdt->guard_tag != csum) { printk(KERN_ERR "%s: guard tag error on sector %lu " \ "(rcvd %04x, data %04x)\n", bix->disk_name, - (unsigned long)sector, + (unsigned long)seed, be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); return -EIO; } - buf += bix->sector_size; - sector++; + buf += bix->interval; + seed++; } return 0; diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 0bf5d79d9ba0..d364c42dbf17 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1464,9 +1464,9 @@ static inline uint64_t rq_io_start_time_ns(struct request *req) struct blk_integrity_exchg { void *prot_buf; void *data_buf; - sector_t sector; + sector_t seed; unsigned int data_size; - unsigned short sector_size; + unsigned short interval; const char *disk_name; }; @@ -1479,7 +1479,7 @@ struct blk_integrity { unsigned short flags; unsigned short tuple_size; - unsigned short sector_size; + unsigned short interval; unsigned short tag_size; const char *name;