mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-02 23:27:06 +00:00
Code Issues Releases Wiki Activity

nvme: add support for the Write Zeroes command

Browse source 
Allow write zeroes operations (REQ_OP_WRITE_ZEROES) on the block
device, if the device supports optional command bit set for write
zeroes. Add support to setup write zeroes command. Set maximum possible
write zeroes sectors in one write zeroes command according to
nvme write zeroes command definition.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@hgst.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Chaitanya Kulkarni 2016-11-30 12:29:01 -08:00 committed by Jens Axboe
parent 3b7c33b28a
commit 6d31e3ba23
1 changed files with 21 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

21
drivers/nvme/host/core.c
View file

@ -272,6 +272,21 @@ static inline int nvme_setup_discard(struct nvme_ns *ns, struct request *req,
return BLK_MQ_RQ_QUEUE_OK;
}
static inline void nvme_setup_write_zeroes(struct nvme_ns *ns,
struct request *req, struct nvme_command *cmnd)
{
struct nvme_write_zeroes_cmd *write_zeroes = &cmnd->write_zeroes;
memset(cmnd, 0, sizeof(*cmnd));
write_zeroes->opcode = nvme_cmd_write_zeroes;
write_zeroes->nsid = cpu_to_le32(ns->ns_id);
write_zeroes->slba =
cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
write_zeroes->length =
cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
write_zeroes->control = 0;
}
static inline void nvme_setup_rw(struct nvme_ns *ns, struct request *req,
struct nvme_command *cmnd)
{
@ -325,6 +340,8 @@ int nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
nvme_setup_flush(ns, cmd);
else if (req_op(req) == REQ_OP_DISCARD)
ret = nvme_setup_discard(ns, req, cmd);
else if (req_op(req) == REQ_OP_WRITE_ZEROES)
nvme_setup_write_zeroes(ns, req, cmd);
else
nvme_setup_rw(ns, req, cmd);
@ -943,6 +960,10 @@ static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
if (ns->ctrl->oncs & NVME_CTRL_ONCS_DSM)
nvme_config_discard(ns);
if (ns->ctrl->oncs & NVME_CTRL_ONCS_WRITE_ZEROES)
blk_queue_max_write_zeroes_sectors(ns->queue,
((u32)(USHRT_MAX + 1) * bs) >> 9);
blk_mq_unfreeze_queue(disk->queue);
}