linux-imx
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committed 02db99548d3x
// 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. */void nvmet_file_ns_disable(struct nvmet_ns *ns){ if (ns->file) { if (ns->buffered_io) flush_workqueue(buffered_io_wq); 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 flags = O_RDWR | O_LARGEFILE; struct kstat stat; int ret; if (!ns->buffered_io) flags |= O_DIRECT; ns->file = filp_open(ns->device_path, flags, 0); if (IS_ERR(ns->file)) { pr_err("failed to open file %s: (%ld)\n", ns->device_path, PTR_ERR(ns->file)); 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) { ret = -ENOMEM; goto err; } ns->bvec_pool = mempool_create(NVMET_MIN_MPOOL_OBJ, mempool_alloc_slab, mempool_free_slab, ns->bvec_cache); if (!ns->bvec_pool) { ret = -ENOMEM; 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 scatterlist *sg){ bv->bv_page = sg_page(sg); bv->bv_offset = sg->offset; bv->bv_len = sg->length;}static ssize_t nvmet_file_submit_bvec(struct nvmet_req *req, loff_t pos, unsigned long nr_segs, size_t count, int ki_flags){ struct kiocb *iocb = &req->f.iocb; ssize_t (*call_iter)(struct kiocb *iocb, struct iov_iter *iter); struct iov_iter iter; int rw;