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-rw-r--r--drivers/nvme/target/io-cmd-bdev.c241
1 files changed, 241 insertions, 0 deletions
diff --git a/drivers/nvme/target/io-cmd-bdev.c b/drivers/nvme/target/io-cmd-bdev.c
new file mode 100644
index 000000000000..e0b0f7df70c2
--- /dev/null
+++ b/drivers/nvme/target/io-cmd-bdev.c
@@ -0,0 +1,241 @@
+/*
+ * 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 = &req->b.inline_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;
+ }
+
+ sector = le64_to_cpu(req->cmd->rw.slba);
+ sector <<= (req->ns->blksize_shift - 9);
+
+ bio_init(bio, req->inline_bvec, ARRAY_SIZE(req->inline_bvec));
+ 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);
+
+ blk_poll(bdev_get_queue(req->ns->bdev), cookie);
+}
+
+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);
+}
+
+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;
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-19 09:59:46 +0100