1d5eff33eSChaitanya Kulkarni // SPDX-License-Identifier: GPL-2.0 2d5eff33eSChaitanya Kulkarni /* 3d5eff33eSChaitanya Kulkarni * NVMe Over Fabrics Target File I/O commands implementation. 4d5eff33eSChaitanya Kulkarni * Copyright (c) 2017-2018 Western Digital Corporation or its 5d5eff33eSChaitanya Kulkarni * affiliates. 6d5eff33eSChaitanya Kulkarni */ 7d5eff33eSChaitanya Kulkarni #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8d5eff33eSChaitanya Kulkarni #include <linux/uio.h> 9d5eff33eSChaitanya Kulkarni #include <linux/falloc.h> 10d5eff33eSChaitanya Kulkarni #include <linux/file.h> 11d5eff33eSChaitanya Kulkarni #include "nvmet.h" 12d5eff33eSChaitanya Kulkarni 13d5eff33eSChaitanya Kulkarni #define NVMET_MAX_MPOOL_BVEC 16 14d5eff33eSChaitanya Kulkarni #define NVMET_MIN_MPOOL_OBJ 16 15d5eff33eSChaitanya Kulkarni 16d5eff33eSChaitanya Kulkarni void nvmet_file_ns_disable(struct nvmet_ns *ns) 17d5eff33eSChaitanya Kulkarni { 18d5eff33eSChaitanya Kulkarni if (ns->file) { 1955eb942eSChaitanya Kulkarni if (ns->buffered_io) 2055eb942eSChaitanya Kulkarni flush_workqueue(buffered_io_wq); 21d5eff33eSChaitanya Kulkarni mempool_destroy(ns->bvec_pool); 22d5eff33eSChaitanya Kulkarni ns->bvec_pool = NULL; 23d5eff33eSChaitanya Kulkarni kmem_cache_destroy(ns->bvec_cache); 24d5eff33eSChaitanya Kulkarni ns->bvec_cache = NULL; 25d5eff33eSChaitanya Kulkarni fput(ns->file); 26d5eff33eSChaitanya Kulkarni ns->file = NULL; 27d5eff33eSChaitanya Kulkarni } 28d5eff33eSChaitanya Kulkarni } 29d5eff33eSChaitanya Kulkarni 30d5eff33eSChaitanya Kulkarni int nvmet_file_ns_enable(struct nvmet_ns *ns) 31d5eff33eSChaitanya Kulkarni { 3255eb942eSChaitanya Kulkarni int flags = O_RDWR | O_LARGEFILE; 33d5eff33eSChaitanya Kulkarni struct kstat stat; 3455eb942eSChaitanya Kulkarni int ret; 35d5eff33eSChaitanya Kulkarni 3655eb942eSChaitanya Kulkarni if (!ns->buffered_io) 3755eb942eSChaitanya Kulkarni flags |= O_DIRECT; 3855eb942eSChaitanya Kulkarni 3955eb942eSChaitanya Kulkarni ns->file = filp_open(ns->device_path, flags, 0); 40d5eff33eSChaitanya Kulkarni if (IS_ERR(ns->file)) { 41d5eff33eSChaitanya Kulkarni pr_err("failed to open file %s: (%ld)\n", 4281cf54e0SWei Yongjun ns->device_path, PTR_ERR(ns->file)); 43d5eff33eSChaitanya Kulkarni return PTR_ERR(ns->file); 44d5eff33eSChaitanya Kulkarni } 45d5eff33eSChaitanya Kulkarni 46d5eff33eSChaitanya Kulkarni ret = vfs_getattr(&ns->file->f_path, 47d5eff33eSChaitanya Kulkarni &stat, STATX_SIZE, AT_STATX_FORCE_SYNC); 48d5eff33eSChaitanya Kulkarni if (ret) 49d5eff33eSChaitanya Kulkarni goto err; 50d5eff33eSChaitanya Kulkarni 51d5eff33eSChaitanya Kulkarni ns->size = stat.size; 52d5eff33eSChaitanya Kulkarni ns->blksize_shift = file_inode(ns->file)->i_blkbits; 53d5eff33eSChaitanya Kulkarni 54d5eff33eSChaitanya Kulkarni ns->bvec_cache = kmem_cache_create("nvmet-bvec", 55d5eff33eSChaitanya Kulkarni NVMET_MAX_MPOOL_BVEC * sizeof(struct bio_vec), 56d5eff33eSChaitanya Kulkarni 0, SLAB_HWCACHE_ALIGN, NULL); 571367bc82SWei Yongjun if (!ns->bvec_cache) { 581367bc82SWei Yongjun ret = -ENOMEM; 59d5eff33eSChaitanya Kulkarni goto err; 601367bc82SWei Yongjun } 61d5eff33eSChaitanya Kulkarni 62d5eff33eSChaitanya Kulkarni ns->bvec_pool = mempool_create(NVMET_MIN_MPOOL_OBJ, mempool_alloc_slab, 63d5eff33eSChaitanya Kulkarni mempool_free_slab, ns->bvec_cache); 64d5eff33eSChaitanya Kulkarni 651367bc82SWei Yongjun if (!ns->bvec_pool) { 661367bc82SWei Yongjun ret = -ENOMEM; 67d5eff33eSChaitanya Kulkarni goto err; 681367bc82SWei Yongjun } 69d5eff33eSChaitanya Kulkarni 70d5eff33eSChaitanya Kulkarni return ret; 71d5eff33eSChaitanya Kulkarni err: 72d5eff33eSChaitanya Kulkarni ns->size = 0; 73d5eff33eSChaitanya Kulkarni ns->blksize_shift = 0; 74d5eff33eSChaitanya Kulkarni nvmet_file_ns_disable(ns); 75d5eff33eSChaitanya Kulkarni return ret; 76d5eff33eSChaitanya Kulkarni } 77d5eff33eSChaitanya Kulkarni 78d5eff33eSChaitanya Kulkarni static void nvmet_file_init_bvec(struct bio_vec *bv, struct sg_page_iter *iter) 79d5eff33eSChaitanya Kulkarni { 80d5eff33eSChaitanya Kulkarni bv->bv_page = sg_page_iter_page(iter); 81d5eff33eSChaitanya Kulkarni bv->bv_offset = iter->sg->offset; 82d5eff33eSChaitanya Kulkarni bv->bv_len = PAGE_SIZE - iter->sg->offset; 83d5eff33eSChaitanya Kulkarni } 84d5eff33eSChaitanya Kulkarni 85d5eff33eSChaitanya Kulkarni static ssize_t nvmet_file_submit_bvec(struct nvmet_req *req, loff_t pos, 8650a909dbSChaitanya Kulkarni unsigned long nr_segs, size_t count, int ki_flags) 87d5eff33eSChaitanya Kulkarni { 88d5eff33eSChaitanya Kulkarni struct kiocb *iocb = &req->f.iocb; 89d5eff33eSChaitanya Kulkarni ssize_t (*call_iter)(struct kiocb *iocb, struct iov_iter *iter); 90d5eff33eSChaitanya Kulkarni struct iov_iter iter; 9150a909dbSChaitanya Kulkarni int rw; 92d5eff33eSChaitanya Kulkarni 93d5eff33eSChaitanya Kulkarni if (req->cmd->rw.opcode == nvme_cmd_write) { 94d5eff33eSChaitanya Kulkarni if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA)) 9550a909dbSChaitanya Kulkarni ki_flags |= IOCB_DSYNC; 96d5eff33eSChaitanya Kulkarni call_iter = req->ns->file->f_op->write_iter; 97d5eff33eSChaitanya Kulkarni rw = WRITE; 98d5eff33eSChaitanya Kulkarni } else { 99d5eff33eSChaitanya Kulkarni call_iter = req->ns->file->f_op->read_iter; 100d5eff33eSChaitanya Kulkarni rw = READ; 101d5eff33eSChaitanya Kulkarni } 102d5eff33eSChaitanya Kulkarni 103aa563d7bSDavid Howells iov_iter_bvec(&iter, rw, req->f.bvec, nr_segs, count); 104d5eff33eSChaitanya Kulkarni 105d5eff33eSChaitanya Kulkarni iocb->ki_pos = pos; 106d5eff33eSChaitanya Kulkarni iocb->ki_filp = req->ns->file; 10755eb942eSChaitanya Kulkarni iocb->ki_flags = ki_flags | iocb_flags(req->ns->file); 108d5eff33eSChaitanya Kulkarni 10950a909dbSChaitanya Kulkarni return call_iter(iocb, &iter); 110d5eff33eSChaitanya Kulkarni } 111d5eff33eSChaitanya Kulkarni 112d5eff33eSChaitanya Kulkarni static void nvmet_file_io_done(struct kiocb *iocb, long ret, long ret2) 113d5eff33eSChaitanya Kulkarni { 114d5eff33eSChaitanya Kulkarni struct nvmet_req *req = container_of(iocb, struct nvmet_req, f.iocb); 115c6aa3542SChaitanya Kulkarni u16 status = NVME_SC_SUCCESS; 116d5eff33eSChaitanya Kulkarni 117d5eff33eSChaitanya Kulkarni if (req->f.bvec != req->inline_bvec) { 118d5eff33eSChaitanya Kulkarni if (likely(req->f.mpool_alloc == false)) 119d5eff33eSChaitanya Kulkarni kfree(req->f.bvec); 120d5eff33eSChaitanya Kulkarni else 121d5eff33eSChaitanya Kulkarni mempool_free(req->f.bvec, req->ns->bvec_pool); 122d5eff33eSChaitanya Kulkarni } 123d5eff33eSChaitanya Kulkarni 124c6aa3542SChaitanya Kulkarni if (unlikely(ret != req->data_len)) 125c6aa3542SChaitanya Kulkarni status = errno_to_nvme_status(req, ret); 126c6aa3542SChaitanya Kulkarni nvmet_req_complete(req, status); 127d5eff33eSChaitanya Kulkarni } 128d5eff33eSChaitanya Kulkarni 12950a909dbSChaitanya Kulkarni static bool nvmet_file_execute_io(struct nvmet_req *req, int ki_flags) 130d5eff33eSChaitanya Kulkarni { 131d5eff33eSChaitanya Kulkarni ssize_t nr_bvec = DIV_ROUND_UP(req->data_len, PAGE_SIZE); 132d5eff33eSChaitanya Kulkarni struct sg_page_iter sg_pg_iter; 133d5eff33eSChaitanya Kulkarni unsigned long bv_cnt = 0; 134d5eff33eSChaitanya Kulkarni bool is_sync = false; 135d5eff33eSChaitanya Kulkarni size_t len = 0, total_len = 0; 136d5eff33eSChaitanya Kulkarni ssize_t ret = 0; 137d5eff33eSChaitanya Kulkarni loff_t pos; 138d5eff33eSChaitanya Kulkarni 13950a909dbSChaitanya Kulkarni 14050a909dbSChaitanya Kulkarni if (req->f.mpool_alloc && nr_bvec > NVMET_MAX_MPOOL_BVEC) 14150a909dbSChaitanya Kulkarni is_sync = true; 142d5eff33eSChaitanya Kulkarni 1439c891c13SSagi Grimberg pos = le64_to_cpu(req->cmd->rw.slba) << req->ns->blksize_shift; 1449c891c13SSagi Grimberg if (unlikely(pos + req->data_len > req->ns->size)) { 145c6aa3542SChaitanya Kulkarni nvmet_req_complete(req, errno_to_nvme_status(req, -ENOSPC)); 14650a909dbSChaitanya Kulkarni return true; 147d5eff33eSChaitanya Kulkarni } 148d5eff33eSChaitanya Kulkarni 149d5eff33eSChaitanya Kulkarni memset(&req->f.iocb, 0, sizeof(struct kiocb)); 150d5eff33eSChaitanya Kulkarni for_each_sg_page(req->sg, &sg_pg_iter, req->sg_cnt, 0) { 151d5eff33eSChaitanya Kulkarni nvmet_file_init_bvec(&req->f.bvec[bv_cnt], &sg_pg_iter); 152d5eff33eSChaitanya Kulkarni len += req->f.bvec[bv_cnt].bv_len; 153d5eff33eSChaitanya Kulkarni total_len += req->f.bvec[bv_cnt].bv_len; 154d5eff33eSChaitanya Kulkarni bv_cnt++; 155d5eff33eSChaitanya Kulkarni 156d5eff33eSChaitanya Kulkarni WARN_ON_ONCE((nr_bvec - 1) < 0); 157d5eff33eSChaitanya Kulkarni 158d5eff33eSChaitanya Kulkarni if (unlikely(is_sync) && 159d5eff33eSChaitanya Kulkarni (nr_bvec - 1 == 0 || bv_cnt == NVMET_MAX_MPOOL_BVEC)) { 16050a909dbSChaitanya Kulkarni ret = nvmet_file_submit_bvec(req, pos, bv_cnt, len, 0); 161d5eff33eSChaitanya Kulkarni if (ret < 0) 16250a909dbSChaitanya Kulkarni goto complete; 16350a909dbSChaitanya Kulkarni 164d5eff33eSChaitanya Kulkarni pos += len; 165d5eff33eSChaitanya Kulkarni bv_cnt = 0; 166d5eff33eSChaitanya Kulkarni len = 0; 167d5eff33eSChaitanya Kulkarni } 168d5eff33eSChaitanya Kulkarni nr_bvec--; 169d5eff33eSChaitanya Kulkarni } 170d5eff33eSChaitanya Kulkarni 17150a909dbSChaitanya Kulkarni if (WARN_ON_ONCE(total_len != req->data_len)) { 172d5eff33eSChaitanya Kulkarni ret = -EIO; 17350a909dbSChaitanya Kulkarni goto complete; 174d5eff33eSChaitanya Kulkarni } 17550a909dbSChaitanya Kulkarni 17650a909dbSChaitanya Kulkarni if (unlikely(is_sync)) { 17750a909dbSChaitanya Kulkarni ret = total_len; 17850a909dbSChaitanya Kulkarni goto complete; 17950a909dbSChaitanya Kulkarni } 18050a909dbSChaitanya Kulkarni 18150a909dbSChaitanya Kulkarni /* 18250a909dbSChaitanya Kulkarni * A NULL ki_complete ask for synchronous execution, which we want 18350a909dbSChaitanya Kulkarni * for the IOCB_NOWAIT case. 18450a909dbSChaitanya Kulkarni */ 18550a909dbSChaitanya Kulkarni if (!(ki_flags & IOCB_NOWAIT)) 186d5eff33eSChaitanya Kulkarni req->f.iocb.ki_complete = nvmet_file_io_done; 18750a909dbSChaitanya Kulkarni 18850a909dbSChaitanya Kulkarni ret = nvmet_file_submit_bvec(req, pos, bv_cnt, total_len, ki_flags); 18950a909dbSChaitanya Kulkarni 19050a909dbSChaitanya Kulkarni switch (ret) { 19150a909dbSChaitanya Kulkarni case -EIOCBQUEUED: 19250a909dbSChaitanya Kulkarni return true; 19350a909dbSChaitanya Kulkarni case -EAGAIN: 19450a909dbSChaitanya Kulkarni if (WARN_ON_ONCE(!(ki_flags & IOCB_NOWAIT))) 19550a909dbSChaitanya Kulkarni goto complete; 19650a909dbSChaitanya Kulkarni return false; 19750a909dbSChaitanya Kulkarni case -EOPNOTSUPP: 19850a909dbSChaitanya Kulkarni /* 19950a909dbSChaitanya Kulkarni * For file systems returning error -EOPNOTSUPP, handle 20050a909dbSChaitanya Kulkarni * IOCB_NOWAIT error case separately and retry without 20150a909dbSChaitanya Kulkarni * IOCB_NOWAIT. 20250a909dbSChaitanya Kulkarni */ 20350a909dbSChaitanya Kulkarni if ((ki_flags & IOCB_NOWAIT)) 20450a909dbSChaitanya Kulkarni return false; 20550a909dbSChaitanya Kulkarni break; 20650a909dbSChaitanya Kulkarni } 20750a909dbSChaitanya Kulkarni 20850a909dbSChaitanya Kulkarni complete: 20950a909dbSChaitanya Kulkarni nvmet_file_io_done(&req->f.iocb, ret, 0); 21050a909dbSChaitanya Kulkarni return true; 211d5eff33eSChaitanya Kulkarni } 212d5eff33eSChaitanya Kulkarni 21355eb942eSChaitanya Kulkarni static void nvmet_file_buffered_io_work(struct work_struct *w) 21455eb942eSChaitanya Kulkarni { 21555eb942eSChaitanya Kulkarni struct nvmet_req *req = container_of(w, struct nvmet_req, f.work); 21655eb942eSChaitanya Kulkarni 21750a909dbSChaitanya Kulkarni nvmet_file_execute_io(req, 0); 21855eb942eSChaitanya Kulkarni } 21955eb942eSChaitanya Kulkarni 22050a909dbSChaitanya Kulkarni static void nvmet_file_submit_buffered_io(struct nvmet_req *req) 22155eb942eSChaitanya Kulkarni { 22255eb942eSChaitanya Kulkarni INIT_WORK(&req->f.work, nvmet_file_buffered_io_work); 22355eb942eSChaitanya Kulkarni queue_work(buffered_io_wq, &req->f.work); 22455eb942eSChaitanya Kulkarni } 22555eb942eSChaitanya Kulkarni 22650a909dbSChaitanya Kulkarni static void nvmet_file_execute_rw(struct nvmet_req *req) 22750a909dbSChaitanya Kulkarni { 22850a909dbSChaitanya Kulkarni ssize_t nr_bvec = DIV_ROUND_UP(req->data_len, PAGE_SIZE); 22950a909dbSChaitanya Kulkarni 23050a909dbSChaitanya Kulkarni if (!req->sg_cnt || !nr_bvec) { 23150a909dbSChaitanya Kulkarni nvmet_req_complete(req, 0); 23250a909dbSChaitanya Kulkarni return; 23350a909dbSChaitanya Kulkarni } 23450a909dbSChaitanya Kulkarni 23550a909dbSChaitanya Kulkarni if (nr_bvec > NVMET_MAX_INLINE_BIOVEC) 23650a909dbSChaitanya Kulkarni req->f.bvec = kmalloc_array(nr_bvec, sizeof(struct bio_vec), 23750a909dbSChaitanya Kulkarni GFP_KERNEL); 23850a909dbSChaitanya Kulkarni else 23950a909dbSChaitanya Kulkarni req->f.bvec = req->inline_bvec; 24050a909dbSChaitanya Kulkarni 24150a909dbSChaitanya Kulkarni if (unlikely(!req->f.bvec)) { 24250a909dbSChaitanya Kulkarni /* fallback under memory pressure */ 24350a909dbSChaitanya Kulkarni req->f.bvec = mempool_alloc(req->ns->bvec_pool, GFP_KERNEL); 24450a909dbSChaitanya Kulkarni req->f.mpool_alloc = true; 24550a909dbSChaitanya Kulkarni } else 24650a909dbSChaitanya Kulkarni req->f.mpool_alloc = false; 24750a909dbSChaitanya Kulkarni 24850a909dbSChaitanya Kulkarni if (req->ns->buffered_io) { 24950a909dbSChaitanya Kulkarni if (likely(!req->f.mpool_alloc) && 25050a909dbSChaitanya Kulkarni nvmet_file_execute_io(req, IOCB_NOWAIT)) 25150a909dbSChaitanya Kulkarni return; 25250a909dbSChaitanya Kulkarni nvmet_file_submit_buffered_io(req); 25350a909dbSChaitanya Kulkarni } else 25450a909dbSChaitanya Kulkarni nvmet_file_execute_io(req, 0); 25550a909dbSChaitanya Kulkarni } 25650a909dbSChaitanya Kulkarni 257dedf0be5SChaitanya Kulkarni u16 nvmet_file_flush(struct nvmet_req *req) 258dedf0be5SChaitanya Kulkarni { 259c6aa3542SChaitanya Kulkarni return errno_to_nvme_status(req, vfs_fsync(req->ns->file, 1)); 260dedf0be5SChaitanya Kulkarni } 261dedf0be5SChaitanya Kulkarni 262d5eff33eSChaitanya Kulkarni static void nvmet_file_flush_work(struct work_struct *w) 263d5eff33eSChaitanya Kulkarni { 264d5eff33eSChaitanya Kulkarni struct nvmet_req *req = container_of(w, struct nvmet_req, f.work); 265d5eff33eSChaitanya Kulkarni 266dedf0be5SChaitanya Kulkarni nvmet_req_complete(req, nvmet_file_flush(req)); 267d5eff33eSChaitanya Kulkarni } 268d5eff33eSChaitanya Kulkarni 269d5eff33eSChaitanya Kulkarni static void nvmet_file_execute_flush(struct nvmet_req *req) 270d5eff33eSChaitanya Kulkarni { 271d5eff33eSChaitanya Kulkarni INIT_WORK(&req->f.work, nvmet_file_flush_work); 272d5eff33eSChaitanya Kulkarni schedule_work(&req->f.work); 273d5eff33eSChaitanya Kulkarni } 274d5eff33eSChaitanya Kulkarni 275d5eff33eSChaitanya Kulkarni static void nvmet_file_execute_discard(struct nvmet_req *req) 276d5eff33eSChaitanya Kulkarni { 277d5eff33eSChaitanya Kulkarni int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; 278d5eff33eSChaitanya Kulkarni struct nvme_dsm_range range; 2791b72b71fSSagi Grimberg loff_t offset, len; 280c6aa3542SChaitanya Kulkarni u16 status = 0; 281c6aa3542SChaitanya Kulkarni int ret; 2821b72b71fSSagi Grimberg int i; 283d5eff33eSChaitanya Kulkarni 284d5eff33eSChaitanya Kulkarni for (i = 0; i <= le32_to_cpu(req->cmd->dsm.nr); i++) { 285c6aa3542SChaitanya Kulkarni status = nvmet_copy_from_sgl(req, i * sizeof(range), &range, 2861b72b71fSSagi Grimberg sizeof(range)); 287c6aa3542SChaitanya Kulkarni if (status) 288d5eff33eSChaitanya Kulkarni break; 2899c891c13SSagi Grimberg 290d5eff33eSChaitanya Kulkarni offset = le64_to_cpu(range.slba) << req->ns->blksize_shift; 2918eacd1bdSBart Van Assche len = le32_to_cpu(range.nlb); 2928eacd1bdSBart Van Assche len <<= req->ns->blksize_shift; 2939c891c13SSagi Grimberg if (offset + len > req->ns->size) { 294c6aa3542SChaitanya Kulkarni req->error_slba = le64_to_cpu(range.slba); 295c6aa3542SChaitanya Kulkarni status = errno_to_nvme_status(req, -ENOSPC); 2969c891c13SSagi Grimberg break; 2979c891c13SSagi Grimberg } 2989c891c13SSagi Grimberg 299c6aa3542SChaitanya Kulkarni ret = vfs_fallocate(req->ns->file, mode, offset, len); 300c6aa3542SChaitanya Kulkarni if (ret) { 301c6aa3542SChaitanya Kulkarni req->error_slba = le64_to_cpu(range.slba); 302c6aa3542SChaitanya Kulkarni status = errno_to_nvme_status(req, ret); 303d5eff33eSChaitanya Kulkarni break; 304d5eff33eSChaitanya Kulkarni } 3051b72b71fSSagi Grimberg } 306d5eff33eSChaitanya Kulkarni 307c6aa3542SChaitanya Kulkarni nvmet_req_complete(req, status); 308d5eff33eSChaitanya Kulkarni } 309d5eff33eSChaitanya Kulkarni 310d5eff33eSChaitanya Kulkarni static void nvmet_file_dsm_work(struct work_struct *w) 311d5eff33eSChaitanya Kulkarni { 312d5eff33eSChaitanya Kulkarni struct nvmet_req *req = container_of(w, struct nvmet_req, f.work); 313d5eff33eSChaitanya Kulkarni 314d5eff33eSChaitanya Kulkarni switch (le32_to_cpu(req->cmd->dsm.attributes)) { 315d5eff33eSChaitanya Kulkarni case NVME_DSMGMT_AD: 316d5eff33eSChaitanya Kulkarni nvmet_file_execute_discard(req); 317d5eff33eSChaitanya Kulkarni return; 318d5eff33eSChaitanya Kulkarni case NVME_DSMGMT_IDR: 319d5eff33eSChaitanya Kulkarni case NVME_DSMGMT_IDW: 320d5eff33eSChaitanya Kulkarni default: 321d5eff33eSChaitanya Kulkarni /* Not supported yet */ 322d5eff33eSChaitanya Kulkarni nvmet_req_complete(req, 0); 323d5eff33eSChaitanya Kulkarni return; 324d5eff33eSChaitanya Kulkarni } 325d5eff33eSChaitanya Kulkarni } 326d5eff33eSChaitanya Kulkarni 327d5eff33eSChaitanya Kulkarni static void nvmet_file_execute_dsm(struct nvmet_req *req) 328d5eff33eSChaitanya Kulkarni { 329d5eff33eSChaitanya Kulkarni INIT_WORK(&req->f.work, nvmet_file_dsm_work); 330d5eff33eSChaitanya Kulkarni schedule_work(&req->f.work); 331d5eff33eSChaitanya Kulkarni } 332d5eff33eSChaitanya Kulkarni 333d5eff33eSChaitanya Kulkarni static void nvmet_file_write_zeroes_work(struct work_struct *w) 334d5eff33eSChaitanya Kulkarni { 335d5eff33eSChaitanya Kulkarni struct nvmet_req *req = container_of(w, struct nvmet_req, f.work); 336d5eff33eSChaitanya Kulkarni struct nvme_write_zeroes_cmd *write_zeroes = &req->cmd->write_zeroes; 337d5eff33eSChaitanya Kulkarni int mode = FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE; 338d5eff33eSChaitanya Kulkarni loff_t offset; 339d5eff33eSChaitanya Kulkarni loff_t len; 340d5eff33eSChaitanya Kulkarni int ret; 341d5eff33eSChaitanya Kulkarni 342d5eff33eSChaitanya Kulkarni offset = le64_to_cpu(write_zeroes->slba) << req->ns->blksize_shift; 343d5eff33eSChaitanya Kulkarni len = (((sector_t)le16_to_cpu(write_zeroes->length) + 1) << 344d5eff33eSChaitanya Kulkarni req->ns->blksize_shift); 345d5eff33eSChaitanya Kulkarni 3469c891c13SSagi Grimberg if (unlikely(offset + len > req->ns->size)) { 347c6aa3542SChaitanya Kulkarni nvmet_req_complete(req, errno_to_nvme_status(req, -ENOSPC)); 3489c891c13SSagi Grimberg return; 3499c891c13SSagi Grimberg } 3509c891c13SSagi Grimberg 351d5eff33eSChaitanya Kulkarni ret = vfs_fallocate(req->ns->file, mode, offset, len); 352c6aa3542SChaitanya Kulkarni nvmet_req_complete(req, ret < 0 ? errno_to_nvme_status(req, ret) : 0); 353d5eff33eSChaitanya Kulkarni } 354d5eff33eSChaitanya Kulkarni 355d5eff33eSChaitanya Kulkarni static void nvmet_file_execute_write_zeroes(struct nvmet_req *req) 356d5eff33eSChaitanya Kulkarni { 357d5eff33eSChaitanya Kulkarni INIT_WORK(&req->f.work, nvmet_file_write_zeroes_work); 358d5eff33eSChaitanya Kulkarni schedule_work(&req->f.work); 359d5eff33eSChaitanya Kulkarni } 360d5eff33eSChaitanya Kulkarni 361d5eff33eSChaitanya Kulkarni u16 nvmet_file_parse_io_cmd(struct nvmet_req *req) 362d5eff33eSChaitanya Kulkarni { 363d5eff33eSChaitanya Kulkarni struct nvme_command *cmd = req->cmd; 364d5eff33eSChaitanya Kulkarni 365d5eff33eSChaitanya Kulkarni switch (cmd->common.opcode) { 366d5eff33eSChaitanya Kulkarni case nvme_cmd_read: 367d5eff33eSChaitanya Kulkarni case nvme_cmd_write: 368d5eff33eSChaitanya Kulkarni req->execute = nvmet_file_execute_rw; 369d5eff33eSChaitanya Kulkarni req->data_len = nvmet_rw_len(req); 370d5eff33eSChaitanya Kulkarni return 0; 371d5eff33eSChaitanya Kulkarni case nvme_cmd_flush: 372d5eff33eSChaitanya Kulkarni req->execute = nvmet_file_execute_flush; 373d5eff33eSChaitanya Kulkarni req->data_len = 0; 374d5eff33eSChaitanya Kulkarni return 0; 375d5eff33eSChaitanya Kulkarni case nvme_cmd_dsm: 376d5eff33eSChaitanya Kulkarni req->execute = nvmet_file_execute_dsm; 377d5eff33eSChaitanya Kulkarni req->data_len = (le32_to_cpu(cmd->dsm.nr) + 1) * 378d5eff33eSChaitanya Kulkarni sizeof(struct nvme_dsm_range); 379d5eff33eSChaitanya Kulkarni return 0; 380d5eff33eSChaitanya Kulkarni case nvme_cmd_write_zeroes: 381d5eff33eSChaitanya Kulkarni req->execute = nvmet_file_execute_write_zeroes; 382d5eff33eSChaitanya Kulkarni req->data_len = 0; 383d5eff33eSChaitanya Kulkarni return 0; 384d5eff33eSChaitanya Kulkarni default: 385d5eff33eSChaitanya Kulkarni pr_err("unhandled cmd for file ns %d on qid %d\n", 386d5eff33eSChaitanya Kulkarni cmd->common.opcode, req->sq->qid); 387c6aa3542SChaitanya Kulkarni req->error_loc = offsetof(struct nvme_common_command, opcode); 388d5eff33eSChaitanya Kulkarni return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; 389d5eff33eSChaitanya Kulkarni } 390d5eff33eSChaitanya Kulkarni } 391