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> 11*c024b226SMaurizio Lombardi #include <linux/fs.h> 12d5eff33eSChaitanya Kulkarni #include "nvmet.h" 13d5eff33eSChaitanya Kulkarni 14d5eff33eSChaitanya Kulkarni #define NVMET_MAX_MPOOL_BVEC 16 15d5eff33eSChaitanya Kulkarni #define NVMET_MIN_MPOOL_OBJ 16 16d5eff33eSChaitanya Kulkarni 17e8cd1ff1SAnthony Iliopoulos int nvmet_file_ns_revalidate(struct nvmet_ns *ns) 18e8cd1ff1SAnthony Iliopoulos { 19e8cd1ff1SAnthony Iliopoulos struct kstat stat; 20e8cd1ff1SAnthony Iliopoulos int ret; 21e8cd1ff1SAnthony Iliopoulos 22e8cd1ff1SAnthony Iliopoulos ret = vfs_getattr(&ns->file->f_path, &stat, STATX_SIZE, 23e8cd1ff1SAnthony Iliopoulos AT_STATX_FORCE_SYNC); 24e8cd1ff1SAnthony Iliopoulos if (!ret) 25e8cd1ff1SAnthony Iliopoulos ns->size = stat.size; 26e8cd1ff1SAnthony Iliopoulos return ret; 27e8cd1ff1SAnthony Iliopoulos } 28e8cd1ff1SAnthony Iliopoulos 29d5eff33eSChaitanya Kulkarni void nvmet_file_ns_disable(struct nvmet_ns *ns) 30d5eff33eSChaitanya Kulkarni { 31d5eff33eSChaitanya Kulkarni if (ns->file) { 3255eb942eSChaitanya Kulkarni if (ns->buffered_io) 3355eb942eSChaitanya Kulkarni flush_workqueue(buffered_io_wq); 34d5eff33eSChaitanya Kulkarni mempool_destroy(ns->bvec_pool); 35d5eff33eSChaitanya Kulkarni ns->bvec_pool = NULL; 36d5eff33eSChaitanya Kulkarni kmem_cache_destroy(ns->bvec_cache); 37d5eff33eSChaitanya Kulkarni ns->bvec_cache = NULL; 38d5eff33eSChaitanya Kulkarni fput(ns->file); 39d5eff33eSChaitanya Kulkarni ns->file = NULL; 40d5eff33eSChaitanya Kulkarni } 41d5eff33eSChaitanya Kulkarni } 42d5eff33eSChaitanya Kulkarni 43d5eff33eSChaitanya Kulkarni int nvmet_file_ns_enable(struct nvmet_ns *ns) 44d5eff33eSChaitanya Kulkarni { 4555eb942eSChaitanya Kulkarni int flags = O_RDWR | O_LARGEFILE; 4655eb942eSChaitanya Kulkarni int ret; 47d5eff33eSChaitanya Kulkarni 4855eb942eSChaitanya Kulkarni if (!ns->buffered_io) 4955eb942eSChaitanya Kulkarni flags |= O_DIRECT; 5055eb942eSChaitanya Kulkarni 5155eb942eSChaitanya Kulkarni ns->file = filp_open(ns->device_path, flags, 0); 52d5eff33eSChaitanya Kulkarni if (IS_ERR(ns->file)) { 5385428beaSDaniel Wagner ret = PTR_ERR(ns->file); 5485428beaSDaniel Wagner pr_err("failed to open file %s: (%d)\n", 5585428beaSDaniel Wagner ns->device_path, ret); 5685428beaSDaniel Wagner ns->file = NULL; 5785428beaSDaniel Wagner return ret; 58d5eff33eSChaitanya Kulkarni } 59d5eff33eSChaitanya Kulkarni 60e8cd1ff1SAnthony Iliopoulos ret = nvmet_file_ns_revalidate(ns); 61d5eff33eSChaitanya Kulkarni if (ret) 62d5eff33eSChaitanya Kulkarni goto err; 63d5eff33eSChaitanya Kulkarni 64525ec495SSagi Grimberg /* 65525ec495SSagi Grimberg * i_blkbits can be greater than the universally accepted upper bound, 66525ec495SSagi Grimberg * so make sure we export a sane namespace lba_shift. 67525ec495SSagi Grimberg */ 68525ec495SSagi Grimberg ns->blksize_shift = min_t(u8, 69525ec495SSagi Grimberg file_inode(ns->file)->i_blkbits, 12); 70d5eff33eSChaitanya Kulkarni 71d5eff33eSChaitanya Kulkarni ns->bvec_cache = kmem_cache_create("nvmet-bvec", 72d5eff33eSChaitanya Kulkarni NVMET_MAX_MPOOL_BVEC * sizeof(struct bio_vec), 73d5eff33eSChaitanya Kulkarni 0, SLAB_HWCACHE_ALIGN, NULL); 741367bc82SWei Yongjun if (!ns->bvec_cache) { 751367bc82SWei Yongjun ret = -ENOMEM; 76d5eff33eSChaitanya Kulkarni goto err; 771367bc82SWei Yongjun } 78d5eff33eSChaitanya Kulkarni 79d5eff33eSChaitanya Kulkarni ns->bvec_pool = mempool_create(NVMET_MIN_MPOOL_OBJ, mempool_alloc_slab, 80d5eff33eSChaitanya Kulkarni mempool_free_slab, ns->bvec_cache); 81d5eff33eSChaitanya Kulkarni 821367bc82SWei Yongjun if (!ns->bvec_pool) { 831367bc82SWei Yongjun ret = -ENOMEM; 84d5eff33eSChaitanya Kulkarni goto err; 851367bc82SWei Yongjun } 86d5eff33eSChaitanya Kulkarni 87d5eff33eSChaitanya Kulkarni return ret; 88d5eff33eSChaitanya Kulkarni err: 89d5eff33eSChaitanya Kulkarni ns->size = 0; 90d5eff33eSChaitanya Kulkarni ns->blksize_shift = 0; 91d5eff33eSChaitanya Kulkarni nvmet_file_ns_disable(ns); 92d5eff33eSChaitanya Kulkarni return ret; 93d5eff33eSChaitanya Kulkarni } 94d5eff33eSChaitanya Kulkarni 9502db9954SMing Lei static void nvmet_file_init_bvec(struct bio_vec *bv, struct scatterlist *sg) 96d5eff33eSChaitanya Kulkarni { 9702db9954SMing Lei bv->bv_page = sg_page(sg); 9802db9954SMing Lei bv->bv_offset = sg->offset; 9902db9954SMing Lei bv->bv_len = sg->length; 100d5eff33eSChaitanya Kulkarni } 101d5eff33eSChaitanya Kulkarni 102d5eff33eSChaitanya Kulkarni static ssize_t nvmet_file_submit_bvec(struct nvmet_req *req, loff_t pos, 10350a909dbSChaitanya Kulkarni unsigned long nr_segs, size_t count, int ki_flags) 104d5eff33eSChaitanya Kulkarni { 105d5eff33eSChaitanya Kulkarni struct kiocb *iocb = &req->f.iocb; 106d5eff33eSChaitanya Kulkarni ssize_t (*call_iter)(struct kiocb *iocb, struct iov_iter *iter); 107d5eff33eSChaitanya Kulkarni struct iov_iter iter; 10850a909dbSChaitanya Kulkarni int rw; 109d5eff33eSChaitanya Kulkarni 110d5eff33eSChaitanya Kulkarni if (req->cmd->rw.opcode == nvme_cmd_write) { 111d5eff33eSChaitanya Kulkarni if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA)) 11250a909dbSChaitanya Kulkarni ki_flags |= IOCB_DSYNC; 113d5eff33eSChaitanya Kulkarni call_iter = req->ns->file->f_op->write_iter; 114d5eff33eSChaitanya Kulkarni rw = WRITE; 115d5eff33eSChaitanya Kulkarni } else { 116d5eff33eSChaitanya Kulkarni call_iter = req->ns->file->f_op->read_iter; 117d5eff33eSChaitanya Kulkarni rw = READ; 118d5eff33eSChaitanya Kulkarni } 119d5eff33eSChaitanya Kulkarni 120aa563d7bSDavid Howells iov_iter_bvec(&iter, rw, req->f.bvec, nr_segs, count); 121d5eff33eSChaitanya Kulkarni 122d5eff33eSChaitanya Kulkarni iocb->ki_pos = pos; 123d5eff33eSChaitanya Kulkarni iocb->ki_filp = req->ns->file; 12455eb942eSChaitanya Kulkarni iocb->ki_flags = ki_flags | iocb_flags(req->ns->file); 125d5eff33eSChaitanya Kulkarni 12650a909dbSChaitanya Kulkarni return call_iter(iocb, &iter); 127d5eff33eSChaitanya Kulkarni } 128d5eff33eSChaitanya Kulkarni 1296b19b766SJens Axboe static void nvmet_file_io_done(struct kiocb *iocb, long ret) 130d5eff33eSChaitanya Kulkarni { 131d5eff33eSChaitanya Kulkarni struct nvmet_req *req = container_of(iocb, struct nvmet_req, f.iocb); 132c6aa3542SChaitanya Kulkarni u16 status = NVME_SC_SUCCESS; 133d5eff33eSChaitanya Kulkarni 134d5eff33eSChaitanya Kulkarni if (req->f.bvec != req->inline_bvec) { 135d5eff33eSChaitanya Kulkarni if (likely(req->f.mpool_alloc == false)) 136d5eff33eSChaitanya Kulkarni kfree(req->f.bvec); 137d5eff33eSChaitanya Kulkarni else 138d5eff33eSChaitanya Kulkarni mempool_free(req->f.bvec, req->ns->bvec_pool); 139d5eff33eSChaitanya Kulkarni } 140d5eff33eSChaitanya Kulkarni 141e9061c39SChristoph Hellwig if (unlikely(ret != req->transfer_len)) 142c6aa3542SChaitanya Kulkarni status = errno_to_nvme_status(req, ret); 143c6aa3542SChaitanya Kulkarni nvmet_req_complete(req, status); 144d5eff33eSChaitanya Kulkarni } 145d5eff33eSChaitanya Kulkarni 14650a909dbSChaitanya Kulkarni static bool nvmet_file_execute_io(struct nvmet_req *req, int ki_flags) 147d5eff33eSChaitanya Kulkarni { 14802db9954SMing Lei ssize_t nr_bvec = req->sg_cnt; 149d5eff33eSChaitanya Kulkarni unsigned long bv_cnt = 0; 150d5eff33eSChaitanya Kulkarni bool is_sync = false; 151d5eff33eSChaitanya Kulkarni size_t len = 0, total_len = 0; 152d5eff33eSChaitanya Kulkarni ssize_t ret = 0; 153d5eff33eSChaitanya Kulkarni loff_t pos; 15402db9954SMing Lei int i; 15502db9954SMing Lei struct scatterlist *sg; 15650a909dbSChaitanya Kulkarni 15750a909dbSChaitanya Kulkarni if (req->f.mpool_alloc && nr_bvec > NVMET_MAX_MPOOL_BVEC) 15850a909dbSChaitanya Kulkarni is_sync = true; 159d5eff33eSChaitanya Kulkarni 1609c891c13SSagi Grimberg pos = le64_to_cpu(req->cmd->rw.slba) << req->ns->blksize_shift; 161e9061c39SChristoph Hellwig if (unlikely(pos + req->transfer_len > req->ns->size)) { 162c6aa3542SChaitanya Kulkarni nvmet_req_complete(req, errno_to_nvme_status(req, -ENOSPC)); 16350a909dbSChaitanya Kulkarni return true; 164d5eff33eSChaitanya Kulkarni } 165d5eff33eSChaitanya Kulkarni 166d5eff33eSChaitanya Kulkarni memset(&req->f.iocb, 0, sizeof(struct kiocb)); 16702db9954SMing Lei for_each_sg(req->sg, sg, req->sg_cnt, i) { 16802db9954SMing Lei nvmet_file_init_bvec(&req->f.bvec[bv_cnt], sg); 169d5eff33eSChaitanya Kulkarni len += req->f.bvec[bv_cnt].bv_len; 170d5eff33eSChaitanya Kulkarni total_len += req->f.bvec[bv_cnt].bv_len; 171d5eff33eSChaitanya Kulkarni bv_cnt++; 172d5eff33eSChaitanya Kulkarni 173d5eff33eSChaitanya Kulkarni WARN_ON_ONCE((nr_bvec - 1) < 0); 174d5eff33eSChaitanya Kulkarni 175d5eff33eSChaitanya Kulkarni if (unlikely(is_sync) && 176d5eff33eSChaitanya Kulkarni (nr_bvec - 1 == 0 || bv_cnt == NVMET_MAX_MPOOL_BVEC)) { 17750a909dbSChaitanya Kulkarni ret = nvmet_file_submit_bvec(req, pos, bv_cnt, len, 0); 178d5eff33eSChaitanya Kulkarni if (ret < 0) 17950a909dbSChaitanya Kulkarni goto complete; 18050a909dbSChaitanya Kulkarni 181d5eff33eSChaitanya Kulkarni pos += len; 182d5eff33eSChaitanya Kulkarni bv_cnt = 0; 183d5eff33eSChaitanya Kulkarni len = 0; 184d5eff33eSChaitanya Kulkarni } 185d5eff33eSChaitanya Kulkarni nr_bvec--; 186d5eff33eSChaitanya Kulkarni } 187d5eff33eSChaitanya Kulkarni 188e9061c39SChristoph Hellwig if (WARN_ON_ONCE(total_len != req->transfer_len)) { 189d5eff33eSChaitanya Kulkarni ret = -EIO; 19050a909dbSChaitanya Kulkarni goto complete; 191d5eff33eSChaitanya Kulkarni } 19250a909dbSChaitanya Kulkarni 19350a909dbSChaitanya Kulkarni if (unlikely(is_sync)) { 19450a909dbSChaitanya Kulkarni ret = total_len; 19550a909dbSChaitanya Kulkarni goto complete; 19650a909dbSChaitanya Kulkarni } 19750a909dbSChaitanya Kulkarni 19850a909dbSChaitanya Kulkarni /* 19950a909dbSChaitanya Kulkarni * A NULL ki_complete ask for synchronous execution, which we want 20050a909dbSChaitanya Kulkarni * for the IOCB_NOWAIT case. 20150a909dbSChaitanya Kulkarni */ 20250a909dbSChaitanya Kulkarni if (!(ki_flags & IOCB_NOWAIT)) 203d5eff33eSChaitanya Kulkarni req->f.iocb.ki_complete = nvmet_file_io_done; 20450a909dbSChaitanya Kulkarni 20550a909dbSChaitanya Kulkarni ret = nvmet_file_submit_bvec(req, pos, bv_cnt, total_len, ki_flags); 20650a909dbSChaitanya Kulkarni 20750a909dbSChaitanya Kulkarni switch (ret) { 20850a909dbSChaitanya Kulkarni case -EIOCBQUEUED: 20950a909dbSChaitanya Kulkarni return true; 21050a909dbSChaitanya Kulkarni case -EAGAIN: 21150a909dbSChaitanya Kulkarni if (WARN_ON_ONCE(!(ki_flags & IOCB_NOWAIT))) 21250a909dbSChaitanya Kulkarni goto complete; 21350a909dbSChaitanya Kulkarni return false; 21450a909dbSChaitanya Kulkarni case -EOPNOTSUPP: 21550a909dbSChaitanya Kulkarni /* 21650a909dbSChaitanya Kulkarni * For file systems returning error -EOPNOTSUPP, handle 21750a909dbSChaitanya Kulkarni * IOCB_NOWAIT error case separately and retry without 21850a909dbSChaitanya Kulkarni * IOCB_NOWAIT. 21950a909dbSChaitanya Kulkarni */ 22050a909dbSChaitanya Kulkarni if ((ki_flags & IOCB_NOWAIT)) 22150a909dbSChaitanya Kulkarni return false; 22250a909dbSChaitanya Kulkarni break; 22350a909dbSChaitanya Kulkarni } 22450a909dbSChaitanya Kulkarni 22550a909dbSChaitanya Kulkarni complete: 2266b19b766SJens Axboe nvmet_file_io_done(&req->f.iocb, ret); 22750a909dbSChaitanya Kulkarni return true; 228d5eff33eSChaitanya Kulkarni } 229d5eff33eSChaitanya Kulkarni 23055eb942eSChaitanya Kulkarni static void nvmet_file_buffered_io_work(struct work_struct *w) 23155eb942eSChaitanya Kulkarni { 23255eb942eSChaitanya Kulkarni struct nvmet_req *req = container_of(w, struct nvmet_req, f.work); 23355eb942eSChaitanya Kulkarni 23450a909dbSChaitanya Kulkarni nvmet_file_execute_io(req, 0); 23555eb942eSChaitanya Kulkarni } 23655eb942eSChaitanya Kulkarni 23750a909dbSChaitanya Kulkarni static void nvmet_file_submit_buffered_io(struct nvmet_req *req) 23855eb942eSChaitanya Kulkarni { 23955eb942eSChaitanya Kulkarni INIT_WORK(&req->f.work, nvmet_file_buffered_io_work); 24055eb942eSChaitanya Kulkarni queue_work(buffered_io_wq, &req->f.work); 24155eb942eSChaitanya Kulkarni } 24255eb942eSChaitanya Kulkarni 24350a909dbSChaitanya Kulkarni static void nvmet_file_execute_rw(struct nvmet_req *req) 24450a909dbSChaitanya Kulkarni { 24502db9954SMing Lei ssize_t nr_bvec = req->sg_cnt; 24650a909dbSChaitanya Kulkarni 247136cc1ffSIsrael Rukshin if (!nvmet_check_transfer_len(req, nvmet_rw_data_len(req))) 248e9061c39SChristoph Hellwig return; 249e9061c39SChristoph Hellwig 25050a909dbSChaitanya Kulkarni if (!req->sg_cnt || !nr_bvec) { 25150a909dbSChaitanya Kulkarni nvmet_req_complete(req, 0); 25250a909dbSChaitanya Kulkarni return; 25350a909dbSChaitanya Kulkarni } 25450a909dbSChaitanya Kulkarni 25550a909dbSChaitanya Kulkarni if (nr_bvec > NVMET_MAX_INLINE_BIOVEC) 25650a909dbSChaitanya Kulkarni req->f.bvec = kmalloc_array(nr_bvec, sizeof(struct bio_vec), 25750a909dbSChaitanya Kulkarni GFP_KERNEL); 25850a909dbSChaitanya Kulkarni else 25950a909dbSChaitanya Kulkarni req->f.bvec = req->inline_bvec; 26050a909dbSChaitanya Kulkarni 26150a909dbSChaitanya Kulkarni if (unlikely(!req->f.bvec)) { 26250a909dbSChaitanya Kulkarni /* fallback under memory pressure */ 26350a909dbSChaitanya Kulkarni req->f.bvec = mempool_alloc(req->ns->bvec_pool, GFP_KERNEL); 26450a909dbSChaitanya Kulkarni req->f.mpool_alloc = true; 26550a909dbSChaitanya Kulkarni } else 26650a909dbSChaitanya Kulkarni req->f.mpool_alloc = false; 26750a909dbSChaitanya Kulkarni 26850a909dbSChaitanya Kulkarni if (req->ns->buffered_io) { 26950a909dbSChaitanya Kulkarni if (likely(!req->f.mpool_alloc) && 270*c024b226SMaurizio Lombardi (req->ns->file->f_mode & FMODE_NOWAIT) && 27150a909dbSChaitanya Kulkarni nvmet_file_execute_io(req, IOCB_NOWAIT)) 27250a909dbSChaitanya Kulkarni return; 27350a909dbSChaitanya Kulkarni nvmet_file_submit_buffered_io(req); 27450a909dbSChaitanya Kulkarni } else 27550a909dbSChaitanya Kulkarni nvmet_file_execute_io(req, 0); 27650a909dbSChaitanya Kulkarni } 27750a909dbSChaitanya Kulkarni 278dedf0be5SChaitanya Kulkarni u16 nvmet_file_flush(struct nvmet_req *req) 279dedf0be5SChaitanya Kulkarni { 280c6aa3542SChaitanya Kulkarni return errno_to_nvme_status(req, vfs_fsync(req->ns->file, 1)); 281dedf0be5SChaitanya Kulkarni } 282dedf0be5SChaitanya Kulkarni 283d5eff33eSChaitanya Kulkarni static void nvmet_file_flush_work(struct work_struct *w) 284d5eff33eSChaitanya Kulkarni { 285d5eff33eSChaitanya Kulkarni struct nvmet_req *req = container_of(w, struct nvmet_req, f.work); 286d5eff33eSChaitanya Kulkarni 287dedf0be5SChaitanya Kulkarni nvmet_req_complete(req, nvmet_file_flush(req)); 288d5eff33eSChaitanya Kulkarni } 289d5eff33eSChaitanya Kulkarni 290d5eff33eSChaitanya Kulkarni static void nvmet_file_execute_flush(struct nvmet_req *req) 291d5eff33eSChaitanya Kulkarni { 292136cc1ffSIsrael Rukshin if (!nvmet_check_transfer_len(req, 0)) 293e9061c39SChristoph Hellwig return; 294d5eff33eSChaitanya Kulkarni INIT_WORK(&req->f.work, nvmet_file_flush_work); 295d5eff33eSChaitanya Kulkarni schedule_work(&req->f.work); 296d5eff33eSChaitanya Kulkarni } 297d5eff33eSChaitanya Kulkarni 298d5eff33eSChaitanya Kulkarni static void nvmet_file_execute_discard(struct nvmet_req *req) 299d5eff33eSChaitanya Kulkarni { 300d5eff33eSChaitanya Kulkarni int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; 301d5eff33eSChaitanya Kulkarni struct nvme_dsm_range range; 3021b72b71fSSagi Grimberg loff_t offset, len; 303c6aa3542SChaitanya Kulkarni u16 status = 0; 304c6aa3542SChaitanya Kulkarni int ret; 3051b72b71fSSagi Grimberg int i; 306d5eff33eSChaitanya Kulkarni 307d5eff33eSChaitanya Kulkarni for (i = 0; i <= le32_to_cpu(req->cmd->dsm.nr); i++) { 308c6aa3542SChaitanya Kulkarni status = nvmet_copy_from_sgl(req, i * sizeof(range), &range, 3091b72b71fSSagi Grimberg sizeof(range)); 310c6aa3542SChaitanya Kulkarni if (status) 311d5eff33eSChaitanya Kulkarni break; 3129c891c13SSagi Grimberg 313d5eff33eSChaitanya Kulkarni offset = le64_to_cpu(range.slba) << req->ns->blksize_shift; 3148eacd1bdSBart Van Assche len = le32_to_cpu(range.nlb); 3158eacd1bdSBart Van Assche len <<= req->ns->blksize_shift; 3169c891c13SSagi Grimberg if (offset + len > req->ns->size) { 317c6aa3542SChaitanya Kulkarni req->error_slba = le64_to_cpu(range.slba); 318c6aa3542SChaitanya Kulkarni status = errno_to_nvme_status(req, -ENOSPC); 3199c891c13SSagi Grimberg break; 3209c891c13SSagi Grimberg } 3219c891c13SSagi Grimberg 322c6aa3542SChaitanya Kulkarni ret = vfs_fallocate(req->ns->file, mode, offset, len); 323005c674fSChristoph Hellwig if (ret && ret != -EOPNOTSUPP) { 324c6aa3542SChaitanya Kulkarni req->error_slba = le64_to_cpu(range.slba); 325c6aa3542SChaitanya Kulkarni status = errno_to_nvme_status(req, ret); 326d5eff33eSChaitanya Kulkarni break; 327d5eff33eSChaitanya Kulkarni } 3281b72b71fSSagi Grimberg } 329d5eff33eSChaitanya Kulkarni 330c6aa3542SChaitanya Kulkarni nvmet_req_complete(req, status); 331d5eff33eSChaitanya Kulkarni } 332d5eff33eSChaitanya Kulkarni 333d5eff33eSChaitanya Kulkarni static void nvmet_file_dsm_work(struct work_struct *w) 334d5eff33eSChaitanya Kulkarni { 335d5eff33eSChaitanya Kulkarni struct nvmet_req *req = container_of(w, struct nvmet_req, f.work); 336d5eff33eSChaitanya Kulkarni 337d5eff33eSChaitanya Kulkarni switch (le32_to_cpu(req->cmd->dsm.attributes)) { 338d5eff33eSChaitanya Kulkarni case NVME_DSMGMT_AD: 339d5eff33eSChaitanya Kulkarni nvmet_file_execute_discard(req); 340d5eff33eSChaitanya Kulkarni return; 341d5eff33eSChaitanya Kulkarni case NVME_DSMGMT_IDR: 342d5eff33eSChaitanya Kulkarni case NVME_DSMGMT_IDW: 343d5eff33eSChaitanya Kulkarni default: 344d5eff33eSChaitanya Kulkarni /* Not supported yet */ 345d5eff33eSChaitanya Kulkarni nvmet_req_complete(req, 0); 346d5eff33eSChaitanya Kulkarni return; 347d5eff33eSChaitanya Kulkarni } 348d5eff33eSChaitanya Kulkarni } 349d5eff33eSChaitanya Kulkarni 350d5eff33eSChaitanya Kulkarni static void nvmet_file_execute_dsm(struct nvmet_req *req) 351d5eff33eSChaitanya Kulkarni { 352b716e688SSagi Grimberg if (!nvmet_check_data_len_lte(req, nvmet_dsm_len(req))) 353e9061c39SChristoph Hellwig return; 354d5eff33eSChaitanya Kulkarni INIT_WORK(&req->f.work, nvmet_file_dsm_work); 355d5eff33eSChaitanya Kulkarni schedule_work(&req->f.work); 356d5eff33eSChaitanya Kulkarni } 357d5eff33eSChaitanya Kulkarni 358d5eff33eSChaitanya Kulkarni static void nvmet_file_write_zeroes_work(struct work_struct *w) 359d5eff33eSChaitanya Kulkarni { 360d5eff33eSChaitanya Kulkarni struct nvmet_req *req = container_of(w, struct nvmet_req, f.work); 361d5eff33eSChaitanya Kulkarni struct nvme_write_zeroes_cmd *write_zeroes = &req->cmd->write_zeroes; 362d5eff33eSChaitanya Kulkarni int mode = FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE; 363d5eff33eSChaitanya Kulkarni loff_t offset; 364d5eff33eSChaitanya Kulkarni loff_t len; 365d5eff33eSChaitanya Kulkarni int ret; 366d5eff33eSChaitanya Kulkarni 367d5eff33eSChaitanya Kulkarni offset = le64_to_cpu(write_zeroes->slba) << req->ns->blksize_shift; 368d5eff33eSChaitanya Kulkarni len = (((sector_t)le16_to_cpu(write_zeroes->length) + 1) << 369d5eff33eSChaitanya Kulkarni req->ns->blksize_shift); 370d5eff33eSChaitanya Kulkarni 3719c891c13SSagi Grimberg if (unlikely(offset + len > req->ns->size)) { 372c6aa3542SChaitanya Kulkarni nvmet_req_complete(req, errno_to_nvme_status(req, -ENOSPC)); 3739c891c13SSagi Grimberg return; 3749c891c13SSagi Grimberg } 3759c891c13SSagi Grimberg 376d5eff33eSChaitanya Kulkarni ret = vfs_fallocate(req->ns->file, mode, offset, len); 377c6aa3542SChaitanya Kulkarni nvmet_req_complete(req, ret < 0 ? errno_to_nvme_status(req, ret) : 0); 378d5eff33eSChaitanya Kulkarni } 379d5eff33eSChaitanya Kulkarni 380d5eff33eSChaitanya Kulkarni static void nvmet_file_execute_write_zeroes(struct nvmet_req *req) 381d5eff33eSChaitanya Kulkarni { 382136cc1ffSIsrael Rukshin if (!nvmet_check_transfer_len(req, 0)) 383e9061c39SChristoph Hellwig return; 384d5eff33eSChaitanya Kulkarni INIT_WORK(&req->f.work, nvmet_file_write_zeroes_work); 385d5eff33eSChaitanya Kulkarni schedule_work(&req->f.work); 386d5eff33eSChaitanya Kulkarni } 387d5eff33eSChaitanya Kulkarni 388d5eff33eSChaitanya Kulkarni u16 nvmet_file_parse_io_cmd(struct nvmet_req *req) 389d5eff33eSChaitanya Kulkarni { 390f3dce2adSChaitanya Kulkarni switch (req->cmd->common.opcode) { 391d5eff33eSChaitanya Kulkarni case nvme_cmd_read: 392d5eff33eSChaitanya Kulkarni case nvme_cmd_write: 393d5eff33eSChaitanya Kulkarni req->execute = nvmet_file_execute_rw; 394d5eff33eSChaitanya Kulkarni return 0; 395d5eff33eSChaitanya Kulkarni case nvme_cmd_flush: 396d5eff33eSChaitanya Kulkarni req->execute = nvmet_file_execute_flush; 397d5eff33eSChaitanya Kulkarni return 0; 398d5eff33eSChaitanya Kulkarni case nvme_cmd_dsm: 399d5eff33eSChaitanya Kulkarni req->execute = nvmet_file_execute_dsm; 400d5eff33eSChaitanya Kulkarni return 0; 401d5eff33eSChaitanya Kulkarni case nvme_cmd_write_zeroes: 402d5eff33eSChaitanya Kulkarni req->execute = nvmet_file_execute_write_zeroes; 403d5eff33eSChaitanya Kulkarni return 0; 404d5eff33eSChaitanya Kulkarni default: 4051c2c7613SChaitanya Kulkarni return nvmet_report_invalid_opcode(req); 406d5eff33eSChaitanya Kulkarni } 407d5eff33eSChaitanya Kulkarni } 408