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/*
* NVMe I/O command implementation.
* Copyright (c) 2015-2016 HGST, a Western Digital Company.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/blkdev.h>
#include <linux/module.h>
#include "nvmet.h"
int nvmet_bdev_ns_enable(struct nvmet_ns *ns)
{
int ret;
ns->bdev = blkdev_get_by_path(ns->device_path,
FMODE_READ | FMODE_WRITE, NULL);
if (IS_ERR(ns->bdev)) {
ret = PTR_ERR(ns->bdev);
if (ret != -ENOTBLK) {
pr_err("failed to open block device %s: (%ld)\n",
ns->device_path, PTR_ERR(ns->bdev));
}
ns->bdev = NULL;
return ret;
}
ns->size = i_size_read(ns->bdev->bd_inode);
ns->blksize_shift = blksize_bits(bdev_logical_block_size(ns->bdev));
return 0;
}
void nvmet_bdev_ns_disable(struct nvmet_ns *ns)
{
if (ns->bdev) {
blkdev_put(ns->bdev, FMODE_WRITE | FMODE_READ);
ns->bdev = NULL;
}
}
static void nvmet_bio_done(struct bio *bio)
{
struct nvmet_req *req = bio->bi_private;
nvmet_req_complete(req,
bio->bi_status ? NVME_SC_INTERNAL | NVME_SC_DNR : 0);
if (bio != &req->b.inline_bio)
bio_put(bio);
}
static void nvmet_bdev_execute_rw(struct nvmet_req *req)
{
int sg_cnt = req->sg_cnt;
struct bio *bio;
struct scatterlist *sg;
sector_t sector;
blk_qc_t cookie;
int op, op_flags = 0, i;
if (!req->sg_cnt) {
nvmet_req_complete(req, 0);
return;
}
if (req->cmd->rw.opcode == nvme_cmd_write) {
op = REQ_OP_WRITE;
op_flags = REQ_SYNC | REQ_IDLE;
if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA))
op_flags |= REQ_FUA;
} else {
op = REQ_OP_READ;
}
if (is_pci_p2pdma_page(sg_page(req->sg)))
op_flags |= REQ_NOMERGE;
sector = le64_to_cpu(req->cmd->rw.slba);
sector <<= (req->ns->blksize_shift - 9);
if (req->data_len <= NVMET_MAX_INLINE_DATA_LEN) {
bio = &req->b.inline_bio;
bio_init(bio, req->inline_bvec, ARRAY_SIZE(req->inline_bvec));
} else {
bio = bio_alloc(GFP_KERNEL, min(sg_cnt, BIO_MAX_PAGES));
}
bio_set_dev(bio, req->ns->bdev);
bio->bi_iter.bi_sector = sector;
bio->bi_private = req;
bio->bi_end_io = nvmet_bio_done;
bio_set_op_attrs(bio, op, op_flags);
for_each_sg(req->sg, sg, req->sg_cnt, i) {
while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
!= sg->length) {
struct bio *prev = bio;
bio = bio_alloc(GFP_KERNEL, min(sg_cnt, BIO_MAX_PAGES));
bio_set_dev(bio, req->ns->bdev);
bio->bi_iter.bi_sector = sector;
bio_set_op_attrs(bio, op, op_flags);
bio_chain(bio, prev);
submit_bio(prev);
}
sector += sg->length >> 9;
sg_cnt--;
}
cookie = submit_bio(bio);
}
static void nvmet_bdev_execute_flush(struct nvmet_req *req)
{
struct bio *bio = &req->b.inline_bio;
bio_init(bio, req->inline_bvec, ARRAY_SIZE(req->inline_bvec));
bio_set_dev(bio, req->ns->bdev);
bio->bi_private = req;
bio->bi_end_io = nvmet_bio_done;
bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
submit_bio(bio);
}
u16 nvmet_bdev_flush(struct nvmet_req *req)
{
if (blkdev_issue_flush(req->ns->bdev, GFP_KERNEL, NULL))
return NVME_SC_INTERNAL | NVME_SC_DNR;
return 0;
}
static u16 nvmet_bdev_discard_range(struct nvmet_ns *ns,
struct nvme_dsm_range *range, struct bio **bio)
{
int ret;
ret = __blkdev_issue_discard(ns->bdev,
le64_to_cpu(range->slba) << (ns->blksize_shift - 9),
le32_to_cpu(range->nlb) << (ns->blksize_shift - 9),
GFP_KERNEL, 0, bio);
if (ret && ret != -EOPNOTSUPP)
return NVME_SC_INTERNAL | NVME_SC_DNR;
return 0;
}
static void nvmet_bdev_execute_discard(struct nvmet_req *req)
{
struct nvme_dsm_range range;
struct bio *bio = NULL;
int i;
u16 status;
for (i = 0; i <= le32_to_cpu(req->cmd->dsm.nr); i++) {
status = nvmet_copy_from_sgl(req, i * sizeof(range), &range,
sizeof(range));
if (status)
break;
status = nvmet_bdev_discard_range(req->ns, &range, &bio);
if (status)
break;
}
if (bio) {
bio->bi_private = req;
bio->bi_end_io = nvmet_bio_done;
if (status) {
bio->bi_status = BLK_STS_IOERR;
bio_endio(bio);
} else {
submit_bio(bio);
}
} else {
nvmet_req_complete(req, status);
}
}
static void nvmet_bdev_execute_dsm(struct nvmet_req *req)
{
switch (le32_to_cpu(req->cmd->dsm.attributes)) {
case NVME_DSMGMT_AD:
nvmet_bdev_execute_discard(req);
return;
case NVME_DSMGMT_IDR:
case NVME_DSMGMT_IDW:
default:
/* Not supported yet */
nvmet_req_complete(req, 0);
return;
}
}
static void nvmet_bdev_execute_write_zeroes(struct nvmet_req *req)
{
struct nvme_write_zeroes_cmd *write_zeroes = &req->cmd->write_zeroes;
struct bio *bio = NULL;
u16 status = NVME_SC_SUCCESS;
sector_t sector;
sector_t nr_sector;
sector = le64_to_cpu(write_zeroes->slba) <<
(req->ns->blksize_shift - 9);
nr_sector = (((sector_t)le16_to_cpu(write_zeroes->length) + 1) <<
(req->ns->blksize_shift - 9));
if (__blkdev_issue_zeroout(req->ns->bdev, sector, nr_sector,
GFP_KERNEL, &bio, 0))
status = NVME_SC_INTERNAL | NVME_SC_DNR;
if (bio) {
bio->bi_private = req;
bio->bi_end_io = nvmet_bio_done;
submit_bio(bio);
} else {
nvmet_req_complete(req, status);
}
}
u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req)
{
struct nvme_command *cmd = req->cmd;
switch (cmd->common.opcode) {
case nvme_cmd_read:
case nvme_cmd_write:
req->execute = nvmet_bdev_execute_rw;
req->data_len = nvmet_rw_len(req);
return 0;
case nvme_cmd_flush:
req->execute = nvmet_bdev_execute_flush;
req->data_len = 0;
return 0;
case nvme_cmd_dsm:
req->execute = nvmet_bdev_execute_dsm;
req->data_len = (le32_to_cpu(cmd->dsm.nr) + 1) *
sizeof(struct nvme_dsm_range);
return 0;
case nvme_cmd_write_zeroes:
req->execute = nvmet_bdev_execute_write_zeroes;
return 0;
default:
pr_err("unhandled cmd %d on qid %d\n", cmd->common.opcode,
req->sq->qid);
return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
}
}
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