1 /*- 2 * BSD LICENSE 3 * 4 * Copyright (c) Intel Corporation. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * * Neither the name of Intel Corporation nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include "spdk/stdinc.h" 35 #include "spdk/blob.h" 36 37 #include "blobstore.h" 38 39 static void 40 zeroes_destroy(struct spdk_bs_dev *bs_dev) 41 { 42 return; 43 } 44 45 static void 46 zeroes_read(struct spdk_bs_dev *dev, struct spdk_io_channel *channel, void *payload, 47 uint64_t lba, uint32_t lba_count, struct spdk_bs_dev_cb_args *cb_args) 48 { 49 memset(payload, 0, dev->blocklen * lba_count); 50 cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, 0); 51 } 52 53 static void 54 zeroes_write(struct spdk_bs_dev *dev, struct spdk_io_channel *channel, void *payload, 55 uint64_t lba, uint32_t lba_count, 56 struct spdk_bs_dev_cb_args *cb_args) 57 { 58 cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, -EPERM); 59 assert(false); 60 } 61 62 static void 63 zeroes_readv(struct spdk_bs_dev *dev, struct spdk_io_channel *channel, 64 struct iovec *iov, int iovcnt, 65 uint64_t lba, uint32_t lba_count, struct spdk_bs_dev_cb_args *cb_args) 66 { 67 int i; 68 69 for (i = 0; i < iovcnt; i++) { 70 memset(iov[i].iov_base, 0, iov[i].iov_len); 71 } 72 73 cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, 0); 74 } 75 76 static void 77 zeroes_writev(struct spdk_bs_dev *dev, struct spdk_io_channel *channel, 78 struct iovec *iov, int iovcnt, 79 uint64_t lba, uint32_t lba_count, 80 struct spdk_bs_dev_cb_args *cb_args) 81 { 82 cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, -EPERM); 83 assert(false); 84 } 85 86 static void 87 zeroes_write_zeroes(struct spdk_bs_dev *dev, struct spdk_io_channel *channel, 88 uint64_t lba, uint32_t lba_count, 89 struct spdk_bs_dev_cb_args *cb_args) 90 { 91 cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, -EPERM); 92 assert(false); 93 } 94 95 static void 96 zeroes_unmap(struct spdk_bs_dev *dev, struct spdk_io_channel *channel, 97 uint64_t lba, uint32_t lba_count, 98 struct spdk_bs_dev_cb_args *cb_args) 99 { 100 cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, -EPERM); 101 assert(false); 102 } 103 104 static struct spdk_bs_dev g_zeroes_bs_dev = { 105 .blockcnt = UINT64_MAX, 106 .blocklen = 512, 107 .create_channel = NULL, 108 .destroy_channel = NULL, 109 .destroy = zeroes_destroy, 110 .read = zeroes_read, 111 .write = zeroes_write, 112 .readv = zeroes_readv, 113 .writev = zeroes_writev, 114 .write_zeroes = zeroes_write_zeroes, 115 .unmap = zeroes_unmap, 116 }; 117 118 struct spdk_bs_dev * 119 bs_create_zeroes_dev(void) 120 { 121 return &g_zeroes_bs_dev; 122 } 123