2018-05-23 12:34:39 +08:00
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// SPDX-License-Identifier: GPL-2.0
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/*
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* NVMe Over Fabrics Target File I/O commands implementation.
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* Copyright (c) 2017-2018 Western Digital Corporation or its
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* affiliates.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/uio.h>
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#include <linux/falloc.h>
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#include <linux/file.h>
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#include "nvmet.h"
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#define NVMET_MAX_MPOOL_BVEC 16
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#define NVMET_MIN_MPOOL_OBJ 16
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void nvmet_file_ns_disable(struct nvmet_ns *ns)
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{
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if (ns->file) {
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2018-06-20 12:01:41 +08:00
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if (ns->buffered_io)
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flush_workqueue(buffered_io_wq);
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2018-05-23 12:34:39 +08:00
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mempool_destroy(ns->bvec_pool);
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ns->bvec_pool = NULL;
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kmem_cache_destroy(ns->bvec_cache);
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ns->bvec_cache = NULL;
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fput(ns->file);
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ns->file = NULL;
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}
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}
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int nvmet_file_ns_enable(struct nvmet_ns *ns)
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{
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2018-06-20 12:01:41 +08:00
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int flags = O_RDWR | O_LARGEFILE;
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2018-05-23 12:34:39 +08:00
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struct kstat stat;
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2018-06-20 12:01:41 +08:00
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int ret;
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if (!ns->buffered_io)
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flags |= O_DIRECT;
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2018-05-23 12:34:39 +08:00
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2018-06-20 12:01:41 +08:00
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ns->file = filp_open(ns->device_path, flags, 0);
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2018-05-23 12:34:39 +08:00
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if (IS_ERR(ns->file)) {
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pr_err("failed to open file %s: (%ld)\n",
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2018-05-31 09:55:58 +08:00
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ns->device_path, PTR_ERR(ns->file));
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2018-05-23 12:34:39 +08:00
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return PTR_ERR(ns->file);
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}
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ret = vfs_getattr(&ns->file->f_path,
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&stat, STATX_SIZE, AT_STATX_FORCE_SYNC);
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if (ret)
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goto err;
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ns->size = stat.size;
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2019-04-25 02:43:23 +08:00
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/*
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* i_blkbits can be greater than the universally accepted upper bound,
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* so make sure we export a sane namespace lba_shift.
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*/
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ns->blksize_shift = min_t(u8,
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file_inode(ns->file)->i_blkbits, 12);
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2018-05-23 12:34:39 +08:00
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ns->bvec_cache = kmem_cache_create("nvmet-bvec",
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NVMET_MAX_MPOOL_BVEC * sizeof(struct bio_vec),
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0, SLAB_HWCACHE_ALIGN, NULL);
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2018-05-31 19:41:30 +08:00
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if (!ns->bvec_cache) {
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ret = -ENOMEM;
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2018-05-23 12:34:39 +08:00
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goto err;
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2018-05-31 19:41:30 +08:00
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}
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2018-05-23 12:34:39 +08:00
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ns->bvec_pool = mempool_create(NVMET_MIN_MPOOL_OBJ, mempool_alloc_slab,
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mempool_free_slab, ns->bvec_cache);
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2018-05-31 19:41:30 +08:00
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if (!ns->bvec_pool) {
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ret = -ENOMEM;
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2018-05-23 12:34:39 +08:00
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goto err;
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2018-05-31 19:41:30 +08:00
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}
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2018-05-23 12:34:39 +08:00
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return ret;
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err:
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ns->size = 0;
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ns->blksize_shift = 0;
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nvmet_file_ns_disable(ns);
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return ret;
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}
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2019-03-27 17:07:22 +08:00
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static void nvmet_file_init_bvec(struct bio_vec *bv, struct scatterlist *sg)
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2018-05-23 12:34:39 +08:00
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{
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2019-03-27 17:07:22 +08:00
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bv->bv_page = sg_page(sg);
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bv->bv_offset = sg->offset;
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bv->bv_len = sg->length;
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2018-05-23 12:34:39 +08:00
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}
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static ssize_t nvmet_file_submit_bvec(struct nvmet_req *req, loff_t pos,
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2018-11-14 14:12:19 +08:00
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unsigned long nr_segs, size_t count, int ki_flags)
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2018-05-23 12:34:39 +08:00
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{
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struct kiocb *iocb = &req->f.iocb;
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ssize_t (*call_iter)(struct kiocb *iocb, struct iov_iter *iter);
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struct iov_iter iter;
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2018-11-14 14:12:19 +08:00
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int rw;
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2018-05-23 12:34:39 +08:00
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if (req->cmd->rw.opcode == nvme_cmd_write) {
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if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA))
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2018-11-14 14:12:19 +08:00
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ki_flags |= IOCB_DSYNC;
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2018-05-23 12:34:39 +08:00
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call_iter = req->ns->file->f_op->write_iter;
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rw = WRITE;
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} else {
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call_iter = req->ns->file->f_op->read_iter;
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rw = READ;
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}
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2018-10-20 07:57:56 +08:00
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iov_iter_bvec(&iter, rw, req->f.bvec, nr_segs, count);
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2018-05-23 12:34:39 +08:00
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iocb->ki_pos = pos;
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iocb->ki_filp = req->ns->file;
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2018-06-20 12:01:41 +08:00
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iocb->ki_flags = ki_flags | iocb_flags(req->ns->file);
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2018-05-23 12:34:39 +08:00
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2018-11-14 14:12:19 +08:00
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return call_iter(iocb, &iter);
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2018-05-23 12:34:39 +08:00
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}
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static void nvmet_file_io_done(struct kiocb *iocb, long ret, long ret2)
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{
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struct nvmet_req *req = container_of(iocb, struct nvmet_req, f.iocb);
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2018-12-13 07:11:43 +08:00
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u16 status = NVME_SC_SUCCESS;
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2018-05-23 12:34:39 +08:00
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if (req->f.bvec != req->inline_bvec) {
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if (likely(req->f.mpool_alloc == false))
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kfree(req->f.bvec);
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else
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mempool_free(req->f.bvec, req->ns->bvec_pool);
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}
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2018-12-13 07:11:43 +08:00
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if (unlikely(ret != req->data_len))
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status = errno_to_nvme_status(req, ret);
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nvmet_req_complete(req, status);
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2018-05-23 12:34:39 +08:00
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}
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2018-11-14 14:12:19 +08:00
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static bool nvmet_file_execute_io(struct nvmet_req *req, int ki_flags)
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2018-05-23 12:34:39 +08:00
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{
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2019-03-27 17:07:22 +08:00
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ssize_t nr_bvec = req->sg_cnt;
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2018-05-23 12:34:39 +08:00
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unsigned long bv_cnt = 0;
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bool is_sync = false;
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size_t len = 0, total_len = 0;
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ssize_t ret = 0;
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loff_t pos;
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2019-03-27 17:07:22 +08:00
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int i;
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struct scatterlist *sg;
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2018-11-14 14:12:19 +08:00
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if (req->f.mpool_alloc && nr_bvec > NVMET_MAX_MPOOL_BVEC)
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is_sync = true;
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2018-05-23 12:34:39 +08:00
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2018-07-11 21:13:04 +08:00
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pos = le64_to_cpu(req->cmd->rw.slba) << req->ns->blksize_shift;
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if (unlikely(pos + req->data_len > req->ns->size)) {
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2018-12-13 07:11:43 +08:00
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nvmet_req_complete(req, errno_to_nvme_status(req, -ENOSPC));
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2018-11-14 14:12:19 +08:00
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return true;
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2018-05-23 12:34:39 +08:00
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}
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memset(&req->f.iocb, 0, sizeof(struct kiocb));
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2019-03-27 17:07:22 +08:00
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for_each_sg(req->sg, sg, req->sg_cnt, i) {
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nvmet_file_init_bvec(&req->f.bvec[bv_cnt], sg);
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2018-05-23 12:34:39 +08:00
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len += req->f.bvec[bv_cnt].bv_len;
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total_len += req->f.bvec[bv_cnt].bv_len;
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bv_cnt++;
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WARN_ON_ONCE((nr_bvec - 1) < 0);
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if (unlikely(is_sync) &&
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(nr_bvec - 1 == 0 || bv_cnt == NVMET_MAX_MPOOL_BVEC)) {
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2018-11-14 14:12:19 +08:00
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ret = nvmet_file_submit_bvec(req, pos, bv_cnt, len, 0);
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2018-05-23 12:34:39 +08:00
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if (ret < 0)
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2018-11-14 14:12:19 +08:00
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goto complete;
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2018-05-23 12:34:39 +08:00
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pos += len;
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bv_cnt = 0;
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len = 0;
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}
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nr_bvec--;
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}
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2018-11-14 14:12:19 +08:00
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if (WARN_ON_ONCE(total_len != req->data_len)) {
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2018-05-23 12:34:39 +08:00
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ret = -EIO;
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2018-11-14 14:12:19 +08:00
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goto complete;
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}
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if (unlikely(is_sync)) {
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ret = total_len;
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goto complete;
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2018-05-23 12:34:39 +08:00
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}
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2018-11-14 14:12:19 +08:00
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/*
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* A NULL ki_complete ask for synchronous execution, which we want
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* for the IOCB_NOWAIT case.
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*/
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if (!(ki_flags & IOCB_NOWAIT))
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req->f.iocb.ki_complete = nvmet_file_io_done;
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ret = nvmet_file_submit_bvec(req, pos, bv_cnt, total_len, ki_flags);
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switch (ret) {
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case -EIOCBQUEUED:
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return true;
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case -EAGAIN:
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if (WARN_ON_ONCE(!(ki_flags & IOCB_NOWAIT)))
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goto complete;
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return false;
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case -EOPNOTSUPP:
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/*
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* For file systems returning error -EOPNOTSUPP, handle
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* IOCB_NOWAIT error case separately and retry without
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* IOCB_NOWAIT.
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*/
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if ((ki_flags & IOCB_NOWAIT))
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return false;
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break;
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}
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complete:
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nvmet_file_io_done(&req->f.iocb, ret, 0);
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return true;
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2018-05-23 12:34:39 +08:00
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}
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2018-06-20 12:01:41 +08:00
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static void nvmet_file_buffered_io_work(struct work_struct *w)
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{
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struct nvmet_req *req = container_of(w, struct nvmet_req, f.work);
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2018-11-14 14:12:19 +08:00
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nvmet_file_execute_io(req, 0);
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2018-06-20 12:01:41 +08:00
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}
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2018-11-14 14:12:19 +08:00
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static void nvmet_file_submit_buffered_io(struct nvmet_req *req)
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2018-06-20 12:01:41 +08:00
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{
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INIT_WORK(&req->f.work, nvmet_file_buffered_io_work);
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queue_work(buffered_io_wq, &req->f.work);
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}
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2018-11-14 14:12:19 +08:00
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static void nvmet_file_execute_rw(struct nvmet_req *req)
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{
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2019-03-27 17:07:22 +08:00
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ssize_t nr_bvec = req->sg_cnt;
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2018-11-14 14:12:19 +08:00
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if (!req->sg_cnt || !nr_bvec) {
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nvmet_req_complete(req, 0);
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return;
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}
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if (nr_bvec > NVMET_MAX_INLINE_BIOVEC)
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req->f.bvec = kmalloc_array(nr_bvec, sizeof(struct bio_vec),
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GFP_KERNEL);
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else
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req->f.bvec = req->inline_bvec;
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if (unlikely(!req->f.bvec)) {
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/* fallback under memory pressure */
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req->f.bvec = mempool_alloc(req->ns->bvec_pool, GFP_KERNEL);
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req->f.mpool_alloc = true;
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} else
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req->f.mpool_alloc = false;
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if (req->ns->buffered_io) {
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if (likely(!req->f.mpool_alloc) &&
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nvmet_file_execute_io(req, IOCB_NOWAIT))
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return;
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nvmet_file_submit_buffered_io(req);
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} else
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nvmet_file_execute_io(req, 0);
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}
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2018-08-08 14:01:07 +08:00
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u16 nvmet_file_flush(struct nvmet_req *req)
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{
|
2018-12-13 07:11:43 +08:00
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return errno_to_nvme_status(req, vfs_fsync(req->ns->file, 1));
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2018-08-08 14:01:07 +08:00
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}
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2018-05-23 12:34:39 +08:00
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static void nvmet_file_flush_work(struct work_struct *w)
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{
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struct nvmet_req *req = container_of(w, struct nvmet_req, f.work);
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2018-08-08 14:01:07 +08:00
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nvmet_req_complete(req, nvmet_file_flush(req));
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2018-05-23 12:34:39 +08:00
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}
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static void nvmet_file_execute_flush(struct nvmet_req *req)
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{
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INIT_WORK(&req->f.work, nvmet_file_flush_work);
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schedule_work(&req->f.work);
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}
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static void nvmet_file_execute_discard(struct nvmet_req *req)
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{
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int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
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struct nvme_dsm_range range;
|
2018-07-11 17:43:16 +08:00
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loff_t offset, len;
|
2018-12-13 07:11:43 +08:00
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u16 status = 0;
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int ret;
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2018-07-11 17:43:16 +08:00
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int i;
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2018-05-23 12:34:39 +08:00
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for (i = 0; i <= le32_to_cpu(req->cmd->dsm.nr); i++) {
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2018-12-13 07:11:43 +08:00
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status = nvmet_copy_from_sgl(req, i * sizeof(range), &range,
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2018-07-11 17:43:16 +08:00
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sizeof(range));
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2018-12-13 07:11:43 +08:00
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if (status)
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2018-05-23 12:34:39 +08:00
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break;
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2018-07-11 21:13:04 +08:00
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2018-05-23 12:34:39 +08:00
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offset = le64_to_cpu(range.slba) << req->ns->blksize_shift;
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2018-10-09 05:28:52 +08:00
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len = le32_to_cpu(range.nlb);
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len <<= req->ns->blksize_shift;
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2018-07-11 21:13:04 +08:00
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if (offset + len > req->ns->size) {
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2018-12-13 07:11:43 +08:00
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|
|
req->error_slba = le64_to_cpu(range.slba);
|
|
|
|
status = errno_to_nvme_status(req, -ENOSPC);
|
2018-07-11 21:13:04 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2018-12-13 07:11:43 +08:00
|
|
|
ret = vfs_fallocate(req->ns->file, mode, offset, len);
|
2019-03-14 01:55:09 +08:00
|
|
|
if (ret && ret != -EOPNOTSUPP) {
|
2018-12-13 07:11:43 +08:00
|
|
|
req->error_slba = le64_to_cpu(range.slba);
|
|
|
|
status = errno_to_nvme_status(req, ret);
|
2018-05-23 12:34:39 +08:00
|
|
|
break;
|
2018-07-11 17:43:16 +08:00
|
|
|
}
|
2018-05-23 12:34:39 +08:00
|
|
|
}
|
|
|
|
|
2018-12-13 07:11:43 +08:00
|
|
|
nvmet_req_complete(req, status);
|
2018-05-23 12:34:39 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
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);
|
|
|
|
|
2018-07-11 21:13:04 +08:00
|
|
|
if (unlikely(offset + len > req->ns->size)) {
|
2018-12-13 07:11:43 +08:00
|
|
|
nvmet_req_complete(req, errno_to_nvme_status(req, -ENOSPC));
|
2018-07-11 21:13:04 +08:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2018-05-23 12:34:39 +08:00
|
|
|
ret = vfs_fallocate(req->ns->file, mode, offset, len);
|
2018-12-13 07:11:43 +08:00
|
|
|
nvmet_req_complete(req, ret < 0 ? errno_to_nvme_status(req, ret) : 0);
|
2018-05-23 12:34:39 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
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:
|
2018-11-14 14:12:19 +08:00
|
|
|
req->execute = nvmet_file_execute_rw;
|
2018-05-23 12:34:39 +08:00
|
|
|
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);
|
2018-12-13 07:11:43 +08:00
|
|
|
req->error_loc = offsetof(struct nvme_common_command, opcode);
|
2018-05-23 12:34:39 +08:00
|
|
|
return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
|
|
|
|
}
|
|
|
|
}
|