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NVMe: Abstract out sector to block number conversion

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Introduce nvme_block_nr() to help convert sectors to block numbers.
This fixes an integer overflow in the SCSI conversion layer, and it's
slightly less typing than opencoding it.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Acked-by: Keith Busch <keith.busch@intel.com>
This commit is contained in:
Matthew Wilcox 2013-03-27 21:28:22 -04:00
parent acb7aa0db0
commit 063cc6d559
3 changed files with 8 additions and 3 deletions
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4
drivers/block/nvme-core.c
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@ -477,7 +477,7 @@ static int nvme_submit_discard(struct nvme_queue *nvmeq, struct nvme_ns *ns,
range->cattr = cpu_to_le32(0);
range->nlb = cpu_to_le32(bio->bi_size >> ns->lba_shift);
range->slba = cpu_to_le64(bio->bi_sector >> (ns->lba_shift - 9));
range->slba = cpu_to_le64(nvme_block_nr(ns, bio->bi_sector));
memset(cmnd, 0, sizeof(*cmnd));
cmnd->dsm.opcode = nvme_cmd_dsm;
@ -590,7 +590,7 @@ static int nvme_submit_bio_queue(struct nvme_queue *nvmeq, struct nvme_ns *ns,
cmnd->rw.nsid = cpu_to_le32(ns->ns_id);
length = nvme_setup_prps(nvmeq->dev, &cmnd->common, iod, length,
GFP_ATOMIC);
cmnd->rw.slba = cpu_to_le64(bio->bi_sector >> (ns->lba_shift - 9));
cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, bio->bi_sector));
cmnd->rw.length = cpu_to_le16((length >> ns->lba_shift) - 1);
cmnd->rw.control = cpu_to_le16(control);
cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);

2
drivers/block/nvme-scsi.c
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@ -2040,7 +2040,7 @@ static int nvme_trans_do_nvme_io(struct nvme_ns *ns, struct sg_io_hdr *hdr,
struct nvme_command c;
u8 opcode = (is_write ? nvme_cmd_write : nvme_cmd_read);
u16 control;
u32 max_blocks = (dev->max_hw_sectors << 9) >> ns->lba_shift;
u32 max_blocks = nvme_block_nr(ns, dev->max_hw_sectors);
num_cmds = nvme_trans_io_get_num_cmds(hdr, cdb_info, max_blocks);

5
include/linux/nvme.h
View File

@ -566,6 +566,11 @@ struct nvme_iod {
struct scatterlist sg[0];
};
static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
{
return (sector >> (ns->lba_shift - 9));
}
/**
* nvme_free_iod - frees an nvme_iod
* @dev: The device that the I/O was submitted to