| 1 | /* |
| 2 | * Custom fio(1) engine that submits synchronous atomic writes to file. |
| 3 | * |
| 4 | * Copyright (C) 2012 Fusion-io, Inc. |
| 5 | * Author: Santhosh Kumar Koundinya. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License as published by the Free |
| 9 | * Software Foundation; under version 2 of the License. You may obtain a copy |
| 10 | * of the source code for DirectFS by sending a request to Fusion-io, Inc., |
| 11 | * 2855 E. Cottonwood Parkway, Suite 100, Salt Lake City, UT 84121; Attention: |
| 12 | * Legal Department. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 15 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License version |
| 17 | * 2 for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License Version 2 |
| 20 | * along with this program; if not see <http://www.gnu.org/licenses/> |
| 21 | */ |
| 22 | |
| 23 | #include <stdlib.h> |
| 24 | #include <stdint.h> |
| 25 | |
| 26 | #include "../fio.h" |
| 27 | |
| 28 | #ifdef FIO_HAVE_FUSION_AW |
| 29 | |
| 30 | #include <vsl_dp_experimental/vectored_write.h> |
| 31 | |
| 32 | /* Fix sector size to 512 bytes independent of actual sector size, just like |
| 33 | * the linux kernel. */ |
| 34 | #define SECTOR_SHIFT 9 |
| 35 | #define SECTOR_SIZE (1U<<SECTOR_SHIFT) |
| 36 | |
| 37 | struct acs_file_data { |
| 38 | struct vsl_iovec iov[IO_VECTOR_LIMIT]; |
| 39 | }; |
| 40 | |
| 41 | static int queue(struct thread_data *td, struct io_u *io_u) |
| 42 | { |
| 43 | int rc; |
| 44 | int iov_index; |
| 45 | off_t offset; |
| 46 | char *xfer_buf; |
| 47 | size_t xfer_buflen; |
| 48 | struct acs_file_data *d = io_u->file->file_data; |
| 49 | |
| 50 | if (io_u->ddir != DDIR_WRITE) { |
| 51 | td_vmsg(td, -EIO, "only writes supported", "io_u->ddir"); |
| 52 | rc = -EIO; |
| 53 | goto out; |
| 54 | } |
| 55 | if (io_u->xfer_buflen > IO_SIZE_MAX) { |
| 56 | td_vmsg(td, -EIO, "data too big", "io_u->xfer_buflen"); |
| 57 | rc = -EIO; |
| 58 | goto out; |
| 59 | } |
| 60 | if (io_u->xfer_buflen & (SECTOR_SIZE - 1)) { |
| 61 | td_vmsg(td, -EIO, "unaligned data size", "io_u->xfer_buflen"); |
| 62 | rc = -EIO; |
| 63 | goto out; |
| 64 | } |
| 65 | |
| 66 | /* Chop up the write into minimal number of iovec's necessary */ |
| 67 | iov_index = 0; |
| 68 | offset = io_u->offset; |
| 69 | xfer_buf = io_u->xfer_buf; |
| 70 | xfer_buflen = io_u->xfer_buflen; |
| 71 | while (xfer_buflen) { |
| 72 | struct vsl_iovec *iov = &d->iov[iov_index++]; |
| 73 | |
| 74 | iov->iov_len = xfer_buflen > IO_VECTOR_MAX_SIZE ? |
| 75 | IO_VECTOR_MAX_SIZE : xfer_buflen; |
| 76 | iov->iov_base = (uint64_t) xfer_buf; |
| 77 | iov->sector = offset >> SECTOR_SHIFT; |
| 78 | iov->iov_flag = VSL_IOV_WRITE; |
| 79 | |
| 80 | offset += iov->iov_len; |
| 81 | xfer_buf += iov->iov_len; |
| 82 | xfer_buflen -= iov->iov_len; |
| 83 | } |
| 84 | assert(xfer_buflen == 0); |
| 85 | assert(iov_index <= IO_VECTOR_LIMIT); |
| 86 | |
| 87 | rc = vsl_vectored_write(io_u->file->fd, d->iov, iov_index, O_ATOMIC); |
| 88 | if (rc == -1) { |
| 89 | td_verror(td, -errno, "vsl_vectored_write"); |
| 90 | rc = -EIO; |
| 91 | goto out; |
| 92 | } else { |
| 93 | io_u->error = 0; |
| 94 | io_u->file->file_pos = io_u->offset + rc; |
| 95 | rc = FIO_Q_COMPLETED; |
| 96 | } |
| 97 | |
| 98 | out: |
| 99 | if (rc < 0) |
| 100 | io_u->error = rc; |
| 101 | |
| 102 | return rc; |
| 103 | } |
| 104 | |
| 105 | static int open_file(struct thread_data *td, struct fio_file *f) |
| 106 | { |
| 107 | int rc; |
| 108 | struct acs_file_data *d = NULL; |
| 109 | |
| 110 | d = malloc(sizeof(*d)); |
| 111 | if (!d) { |
| 112 | td_verror(td, -ENOMEM, "malloc"); |
| 113 | rc = -ENOMEM; |
| 114 | goto error; |
| 115 | } |
| 116 | f->file_data = d; |
| 117 | |
| 118 | rc = generic_open_file(td, f); |
| 119 | |
| 120 | out: |
| 121 | return rc; |
| 122 | |
| 123 | error: |
| 124 | f->fd = -1; |
| 125 | f->file_data = NULL; |
| 126 | if (d) |
| 127 | free(d); |
| 128 | |
| 129 | goto out; |
| 130 | } |
| 131 | |
| 132 | static int close_file(struct thread_data *td, struct fio_file *f) |
| 133 | { |
| 134 | if (f->file_data) { |
| 135 | free(f->file_data); |
| 136 | f->file_data = NULL; |
| 137 | } |
| 138 | |
| 139 | return generic_close_file(td, f); |
| 140 | } |
| 141 | |
| 142 | static struct ioengine_ops ioengine = { |
| 143 | .name = "fusion-aw-sync", |
| 144 | .version = FIO_IOOPS_VERSION, |
| 145 | .queue = queue, |
| 146 | .open_file = open_file, |
| 147 | .close_file = close_file, |
| 148 | .get_file_size = generic_get_file_size, |
| 149 | .flags = FIO_SYNCIO | FIO_RAWIO | FIO_MEMALIGN |
| 150 | }; |
| 151 | |
| 152 | #else /* !FUSION_HAVE_FUSION_AW */ |
| 153 | |
| 154 | static int fio_fusion_aw_eng_init(struct thread_data fio_unused *td) |
| 155 | { |
| 156 | log_err("fio: fusion atomic write engine not available\n"); |
| 157 | return 1; |
| 158 | } |
| 159 | |
| 160 | static struct ioengine_ops ioengine = { |
| 161 | .name = "fusion-aw-sync", |
| 162 | .version = FIO_IOOPS_VERSION, |
| 163 | .init = fio_fusion_aw_eng_init, |
| 164 | }; |
| 165 | |
| 166 | #endif /* FUSION_HAVE_FUSION_AW */ |
| 167 | |
| 168 | static void fio_init fio_fusion_aw_init(void) |
| 169 | { |
| 170 | register_ioengine(&ioengine); |
| 171 | } |
| 172 | |
| 173 | static void fio_exit fio_fusion_aw_exit(void) |
| 174 | { |
| 175 | unregister_ioengine(&ioengine); |
| 176 | } |