This patch adds simple file backed namespace support for NVMeOF target.
The new file io-cmd-file.c is responsible for handling the code for I/O
commands when ns is file backed. Also, we introduce mempools based slow
path using sync I/Os for file backed ns to ensure forward progress under
reclaim.
The old block device based implementation is moved to io-cmd-bdev.c and
use a "nvmet_bdev_" symbol prefix. The enable/disable calls are also
move into the respective files.
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
[hch: updated changelog, fixed double req->ns lookup in bdev case]
Signed-off-by: Christoph Hellwig <hch@lst.de>
obj-$(CONFIG_NVME_TARGET_FC) += nvmet-fc.o
obj-$(CONFIG_NVME_TARGET_FCLOOP) += nvme-fcloop.o
-nvmet-y += core.o configfs.o admin-cmd.o io-cmd.o fabrics-cmd.o \
- discovery.o
+nvmet-y += core.o configfs.o admin-cmd.o fabrics-cmd.o \
+ discovery.o io-cmd-file.o io-cmd-bdev.o
nvme-loop-y += loop.o
nvmet-rdma-y += rdma.o
nvmet-fc-y += fc.o
return NVME_SC_INVALID_NS;
}
+ /* we don't have the right data for file backed ns */
+ if (!ns->bdev)
+ goto out;
+
host_reads = part_stat_read(ns->bdev->bd_part, ios[READ]);
data_units_read = part_stat_read(ns->bdev->bd_part, sectors[READ]);
host_writes = part_stat_read(ns->bdev->bd_part, ios[WRITE]);
put_unaligned_le64(data_units_read, &slog->data_units_read[0]);
put_unaligned_le64(host_writes, &slog->host_writes[0]);
put_unaligned_le64(data_units_written, &slog->data_units_written[0]);
+out:
nvmet_put_namespace(ns);
return NVME_SC_SUCCESS;
rcu_read_lock();
list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) {
+ /* we don't have the right data for file backed ns */
+ if (!ns->bdev)
+ continue;
host_reads += part_stat_read(ns->bdev->bd_part, ios[READ]);
data_units_read +=
part_stat_read(ns->bdev->bd_part, sectors[READ]);
percpu_ref_put(&ns->ref);
}
+static void nvmet_ns_dev_disable(struct nvmet_ns *ns)
+{
+ nvmet_bdev_ns_disable(ns);
+ nvmet_file_ns_disable(ns);
+}
+
int nvmet_ns_enable(struct nvmet_ns *ns)
{
struct nvmet_subsys *subsys = ns->subsys;
if (ns->enabled)
goto out_unlock;
- ns->bdev = blkdev_get_by_path(ns->device_path, FMODE_READ | FMODE_WRITE,
- NULL);
- if (IS_ERR(ns->bdev)) {
- pr_err("failed to open block device %s: (%ld)\n",
- ns->device_path, PTR_ERR(ns->bdev));
- ret = PTR_ERR(ns->bdev);
- ns->bdev = NULL;
+ ret = nvmet_bdev_ns_enable(ns);
+ if (ret)
+ ret = nvmet_file_ns_enable(ns);
+ if (ret)
goto out_unlock;
- }
-
- ns->size = i_size_read(ns->bdev->bd_inode);
- ns->blksize_shift = blksize_bits(bdev_logical_block_size(ns->bdev));
ret = percpu_ref_init(&ns->ref, nvmet_destroy_namespace,
0, GFP_KERNEL);
if (ret)
- goto out_blkdev_put;
+ goto out_dev_put;
if (ns->nsid > subsys->max_nsid)
subsys->max_nsid = ns->nsid;
out_unlock:
mutex_unlock(&subsys->lock);
return ret;
-out_blkdev_put:
- blkdev_put(ns->bdev, FMODE_WRITE|FMODE_READ);
- ns->bdev = NULL;
+out_dev_put:
+ nvmet_ns_dev_disable(ns);
goto out_unlock;
}
list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry)
nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE, 0, 0);
- if (ns->bdev)
- blkdev_put(ns->bdev, FMODE_WRITE|FMODE_READ);
+ nvmet_ns_dev_disable(ns);
out_unlock:
mutex_unlock(&subsys->lock);
}
}
EXPORT_SYMBOL_GPL(nvmet_sq_init);
+static u16 nvmet_parse_io_cmd(struct nvmet_req *req)
+{
+ struct nvme_command *cmd = req->cmd;
+ u16 ret;
+
+ ret = nvmet_check_ctrl_status(req, cmd);
+ if (unlikely(ret))
+ return ret;
+
+ req->ns = nvmet_find_namespace(req->sq->ctrl, cmd->rw.nsid);
+ if (unlikely(!req->ns))
+ return NVME_SC_INVALID_NS | NVME_SC_DNR;
+
+ if (req->ns->file)
+ return nvmet_file_parse_io_cmd(req);
+ else
+ return nvmet_bdev_parse_io_cmd(req);
+}
+
bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq,
struct nvmet_sq *sq, const struct nvmet_fabrics_ops *ops)
{
--- /dev/null
+/*
+ * 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;
+ }
+}
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * NVMe Over Fabrics Target File I/O commands implementation.
+ * Copyright (c) 2017-2018 Western Digital Corporation or its
+ * affiliates.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/uio.h>
+#include <linux/falloc.h>
+#include <linux/file.h>
+#include "nvmet.h"
+
+#define NVMET_MAX_MPOOL_BVEC 16
+#define NVMET_MIN_MPOOL_OBJ 16
+
+void nvmet_file_ns_disable(struct nvmet_ns *ns)
+{
+ if (ns->file) {
+ mempool_destroy(ns->bvec_pool);
+ ns->bvec_pool = NULL;
+ kmem_cache_destroy(ns->bvec_cache);
+ ns->bvec_cache = NULL;
+ fput(ns->file);
+ ns->file = NULL;
+ }
+}
+
+int nvmet_file_ns_enable(struct nvmet_ns *ns)
+{
+ int ret;
+ struct kstat stat;
+
+ ns->file = filp_open(ns->device_path,
+ O_RDWR | O_LARGEFILE | O_DIRECT, 0);
+ if (IS_ERR(ns->file)) {
+ pr_err("failed to open file %s: (%ld)\n",
+ ns->device_path, PTR_ERR(ns->bdev));
+ return PTR_ERR(ns->file);
+ }
+
+ ret = vfs_getattr(&ns->file->f_path,
+ &stat, STATX_SIZE, AT_STATX_FORCE_SYNC);
+ if (ret)
+ goto err;
+
+ ns->size = stat.size;
+ ns->blksize_shift = file_inode(ns->file)->i_blkbits;
+
+ ns->bvec_cache = kmem_cache_create("nvmet-bvec",
+ NVMET_MAX_MPOOL_BVEC * sizeof(struct bio_vec),
+ 0, SLAB_HWCACHE_ALIGN, NULL);
+ if (!ns->bvec_cache)
+ goto err;
+
+ ns->bvec_pool = mempool_create(NVMET_MIN_MPOOL_OBJ, mempool_alloc_slab,
+ mempool_free_slab, ns->bvec_cache);
+
+ if (!ns->bvec_pool)
+ goto err;
+
+ return ret;
+err:
+ ns->size = 0;
+ ns->blksize_shift = 0;
+ nvmet_file_ns_disable(ns);
+ return ret;
+}
+
+static void nvmet_file_init_bvec(struct bio_vec *bv, struct sg_page_iter *iter)
+{
+ bv->bv_page = sg_page_iter_page(iter);
+ bv->bv_offset = iter->sg->offset;
+ bv->bv_len = PAGE_SIZE - iter->sg->offset;
+}
+
+static ssize_t nvmet_file_submit_bvec(struct nvmet_req *req, loff_t pos,
+ unsigned long nr_segs, size_t count)
+{
+ struct kiocb *iocb = &req->f.iocb;
+ ssize_t (*call_iter)(struct kiocb *iocb, struct iov_iter *iter);
+ struct iov_iter iter;
+ int ki_flags = 0, rw;
+ ssize_t ret;
+
+ if (req->cmd->rw.opcode == nvme_cmd_write) {
+ if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA))
+ ki_flags = IOCB_DSYNC;
+ call_iter = req->ns->file->f_op->write_iter;
+ rw = WRITE;
+ } else {
+ call_iter = req->ns->file->f_op->read_iter;
+ rw = READ;
+ }
+
+ iov_iter_bvec(&iter, ITER_BVEC | rw, req->f.bvec, nr_segs, count);
+
+ iocb->ki_pos = pos;
+ iocb->ki_filp = req->ns->file;
+ iocb->ki_flags = IOCB_DIRECT | ki_flags;
+
+ ret = call_iter(iocb, &iter);
+
+ if (ret != -EIOCBQUEUED && iocb->ki_complete)
+ iocb->ki_complete(iocb, ret, 0);
+
+ return ret;
+}
+
+static void nvmet_file_io_done(struct kiocb *iocb, long ret, long ret2)
+{
+ struct nvmet_req *req = container_of(iocb, struct nvmet_req, f.iocb);
+
+ if (req->f.bvec != req->inline_bvec) {
+ if (likely(req->f.mpool_alloc == false))
+ kfree(req->f.bvec);
+ else
+ mempool_free(req->f.bvec, req->ns->bvec_pool);
+ }
+
+ nvmet_req_complete(req, ret != req->data_len ?
+ NVME_SC_INTERNAL | NVME_SC_DNR : 0);
+}
+
+static void nvmet_file_execute_rw(struct nvmet_req *req)
+{
+ ssize_t nr_bvec = DIV_ROUND_UP(req->data_len, PAGE_SIZE);
+ struct sg_page_iter sg_pg_iter;
+ unsigned long bv_cnt = 0;
+ bool is_sync = false;
+ size_t len = 0, total_len = 0;
+ ssize_t ret = 0;
+ loff_t pos;
+
+ if (!req->sg_cnt || !nr_bvec) {
+ nvmet_req_complete(req, 0);
+ return;
+ }
+
+ if (nr_bvec > NVMET_MAX_INLINE_BIOVEC)
+ req->f.bvec = kmalloc_array(nr_bvec, sizeof(struct bio_vec),
+ GFP_KERNEL);
+ else
+ req->f.bvec = req->inline_bvec;
+
+ req->f.mpool_alloc = false;
+ if (unlikely(!req->f.bvec)) {
+ /* fallback under memory pressure */
+ req->f.bvec = mempool_alloc(req->ns->bvec_pool, GFP_KERNEL);
+ req->f.mpool_alloc = true;
+ if (nr_bvec > NVMET_MAX_MPOOL_BVEC)
+ is_sync = true;
+ }
+
+ pos = le64_to_cpu(req->cmd->rw.slba) << req->ns->blksize_shift;
+
+ memset(&req->f.iocb, 0, sizeof(struct kiocb));
+ for_each_sg_page(req->sg, &sg_pg_iter, req->sg_cnt, 0) {
+ nvmet_file_init_bvec(&req->f.bvec[bv_cnt], &sg_pg_iter);
+ len += req->f.bvec[bv_cnt].bv_len;
+ total_len += req->f.bvec[bv_cnt].bv_len;
+ bv_cnt++;
+
+ WARN_ON_ONCE((nr_bvec - 1) < 0);
+
+ if (unlikely(is_sync) &&
+ (nr_bvec - 1 == 0 || bv_cnt == NVMET_MAX_MPOOL_BVEC)) {
+ ret = nvmet_file_submit_bvec(req, pos, bv_cnt, len);
+ if (ret < 0)
+ goto out;
+ pos += len;
+ bv_cnt = 0;
+ len = 0;
+ }
+ nr_bvec--;
+ }
+
+ if (WARN_ON_ONCE(total_len != req->data_len))
+ ret = -EIO;
+out:
+ if (unlikely(is_sync || ret)) {
+ nvmet_file_io_done(&req->f.iocb, ret < 0 ? ret : total_len, 0);
+ return;
+ }
+ req->f.iocb.ki_complete = nvmet_file_io_done;
+ nvmet_file_submit_bvec(req, pos, bv_cnt, total_len);
+}
+
+static void nvmet_file_flush_work(struct work_struct *w)
+{
+ struct nvmet_req *req = container_of(w, struct nvmet_req, f.work);
+ int ret;
+
+ ret = vfs_fsync(req->ns->file, 1);
+
+ nvmet_req_complete(req, ret < 0 ? NVME_SC_INTERNAL | NVME_SC_DNR : 0);
+}
+
+static void nvmet_file_execute_flush(struct nvmet_req *req)
+{
+ INIT_WORK(&req->f.work, nvmet_file_flush_work);
+ schedule_work(&req->f.work);
+}
+
+static void nvmet_file_execute_discard(struct nvmet_req *req)
+{
+ int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
+ struct nvme_dsm_range range;
+ loff_t offset;
+ loff_t len;
+ int i, ret;
+
+ for (i = 0; i <= le32_to_cpu(req->cmd->dsm.nr); i++) {
+ if (nvmet_copy_from_sgl(req, i * sizeof(range), &range,
+ sizeof(range)))
+ break;
+ offset = le64_to_cpu(range.slba) << req->ns->blksize_shift;
+ len = le32_to_cpu(range.nlb) << req->ns->blksize_shift;
+ ret = vfs_fallocate(req->ns->file, mode, offset, len);
+ if (ret)
+ break;
+ }
+
+ nvmet_req_complete(req, ret < 0 ? NVME_SC_INTERNAL | NVME_SC_DNR : 0);
+}
+
+static void nvmet_file_dsm_work(struct work_struct *w)
+{
+ struct nvmet_req *req = container_of(w, struct nvmet_req, f.work);
+
+ switch (le32_to_cpu(req->cmd->dsm.attributes)) {
+ case NVME_DSMGMT_AD:
+ nvmet_file_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_file_execute_dsm(struct nvmet_req *req)
+{
+ INIT_WORK(&req->f.work, nvmet_file_dsm_work);
+ schedule_work(&req->f.work);
+}
+
+static void nvmet_file_write_zeroes_work(struct work_struct *w)
+{
+ struct nvmet_req *req = container_of(w, struct nvmet_req, f.work);
+ struct nvme_write_zeroes_cmd *write_zeroes = &req->cmd->write_zeroes;
+ int mode = FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE;
+ loff_t offset;
+ loff_t len;
+ int ret;
+
+ offset = le64_to_cpu(write_zeroes->slba) << req->ns->blksize_shift;
+ len = (((sector_t)le16_to_cpu(write_zeroes->length) + 1) <<
+ req->ns->blksize_shift);
+
+ ret = vfs_fallocate(req->ns->file, mode, offset, len);
+ nvmet_req_complete(req, ret < 0 ? NVME_SC_INTERNAL | NVME_SC_DNR : 0);
+}
+
+static void nvmet_file_execute_write_zeroes(struct nvmet_req *req)
+{
+ INIT_WORK(&req->f.work, nvmet_file_write_zeroes_work);
+ schedule_work(&req->f.work);
+}
+
+u16 nvmet_file_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_file_execute_rw;
+ req->data_len = nvmet_rw_len(req);
+ return 0;
+ case nvme_cmd_flush:
+ req->execute = nvmet_file_execute_flush;
+ req->data_len = 0;
+ return 0;
+ case nvme_cmd_dsm:
+ req->execute = nvmet_file_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_file_execute_write_zeroes;
+ req->data_len = 0;
+ return 0;
+ default:
+ pr_err("unhandled cmd for file ns %d on qid %d\n",
+ cmd->common.opcode, req->sq->qid);
+ return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
+ }
+}
+++ /dev/null
-/*
- * 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"
-
-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->inline_bio)
- bio_put(bio);
-}
-
-static inline u32 nvmet_rw_len(struct nvmet_req *req)
-{
- return ((u32)le16_to_cpu(req->cmd->rw.length) + 1) <<
- req->ns->blksize_shift;
-}
-
-static void nvmet_execute_rw(struct nvmet_req *req)
-{
- int sg_cnt = req->sg_cnt;
- struct bio *bio = &req->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_execute_flush(struct nvmet_req *req)
-{
- struct bio *bio = &req->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_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_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_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_execute_dsm(struct nvmet_req *req)
-{
- switch (le32_to_cpu(req->cmd->dsm.attributes)) {
- case NVME_DSMGMT_AD:
- nvmet_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_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_parse_io_cmd(struct nvmet_req *req)
-{
- struct nvme_command *cmd = req->cmd;
- u16 ret;
-
- ret = nvmet_check_ctrl_status(req, cmd);
- if (unlikely(ret))
- return ret;
-
- req->ns = nvmet_find_namespace(req->sq->ctrl, cmd->rw.nsid);
- if (unlikely(!req->ns))
- return NVME_SC_INVALID_NS | NVME_SC_DNR;
-
- switch (cmd->common.opcode) {
- case nvme_cmd_read:
- case nvme_cmd_write:
- req->execute = nvmet_execute_rw;
- req->data_len = nvmet_rw_len(req);
- return 0;
- case nvme_cmd_flush:
- req->execute = nvmet_execute_flush;
- req->data_len = 0;
- return 0;
- case nvme_cmd_dsm:
- req->execute = nvmet_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_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;
- }
-}
struct list_head dev_link;
struct percpu_ref ref;
struct block_device *bdev;
+ struct file *file;
u32 nsid;
u32 blksize_shift;
loff_t size;
struct config_group group;
struct completion disable_done;
+ mempool_t *bvec_pool;
+ struct kmem_cache *bvec_cache;
};
static inline struct nvmet_ns *to_nvmet_ns(struct config_item *item)
struct nvmet_cq *cq;
struct nvmet_ns *ns;
struct scatterlist *sg;
- struct bio inline_bio;
struct bio_vec inline_bvec[NVMET_MAX_INLINE_BIOVEC];
+ union {
+ struct {
+ struct bio inline_bio;
+ } b;
+ struct {
+ bool mpool_alloc;
+ struct kiocb iocb;
+ struct bio_vec *bvec;
+ struct work_struct work;
+ } f;
+ };
int sg_cnt;
/* data length as parsed from the command: */
size_t data_len;
};
u16 nvmet_parse_connect_cmd(struct nvmet_req *req);
-u16 nvmet_parse_io_cmd(struct nvmet_req *req);
+u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req);
+u16 nvmet_file_parse_io_cmd(struct nvmet_req *req);
u16 nvmet_parse_admin_cmd(struct nvmet_req *req);
u16 nvmet_parse_discovery_cmd(struct nvmet_req *req);
u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req);
bool nvmet_host_allowed(struct nvmet_req *req, struct nvmet_subsys *subsys,
const char *hostnqn);
+int nvmet_bdev_ns_enable(struct nvmet_ns *ns);
+int nvmet_file_ns_enable(struct nvmet_ns *ns);
+void nvmet_bdev_ns_disable(struct nvmet_ns *ns);
+void nvmet_file_ns_disable(struct nvmet_ns *ns);
+
+static inline u32 nvmet_rw_len(struct nvmet_req *req)
+{
+ return ((u32)le16_to_cpu(req->cmd->rw.length) + 1) <<
+ req->ns->blksize_shift;
+}
#endif /* _NVMET_H */
projects / linux-2.6-block.git / commitdiff