| 1 | /* |
| 2 | * MTD engine |
| 3 | * |
| 4 | * IO engine that reads/writes from MTD character devices. |
| 5 | * |
| 6 | */ |
| 7 | #include <assert.h> |
| 8 | #include <stdio.h> |
| 9 | #include <stdlib.h> |
| 10 | #include <unistd.h> |
| 11 | #include <errno.h> |
| 12 | #include <sys/ioctl.h> |
| 13 | #include <mtd/mtd-user.h> |
| 14 | |
| 15 | #include "../fio.h" |
| 16 | #include "../verify.h" |
| 17 | #include "../oslib/libmtd.h" |
| 18 | |
| 19 | static libmtd_t desc; |
| 20 | |
| 21 | struct fio_mtd_data { |
| 22 | struct mtd_dev_info info; |
| 23 | }; |
| 24 | |
| 25 | static int fio_mtd_maybe_mark_bad(struct thread_data *td, |
| 26 | struct fio_mtd_data *fmd, |
| 27 | struct io_u *io_u, int eb) |
| 28 | { |
| 29 | int ret; |
| 30 | if (errno == EIO) { |
| 31 | ret = mtd_mark_bad(&fmd->info, io_u->file->fd, eb); |
| 32 | if (ret != 0) { |
| 33 | io_u->error = errno; |
| 34 | td_verror(td, errno, "mtd_mark_bad"); |
| 35 | return -1; |
| 36 | } |
| 37 | } |
| 38 | return 0; |
| 39 | } |
| 40 | |
| 41 | static int fio_mtd_is_bad(struct thread_data *td, |
| 42 | struct fio_mtd_data *fmd, |
| 43 | struct io_u *io_u, int eb) |
| 44 | { |
| 45 | int ret = mtd_is_bad(&fmd->info, io_u->file->fd, eb); |
| 46 | if (ret == -1) { |
| 47 | io_u->error = errno; |
| 48 | td_verror(td, errno, "mtd_is_bad"); |
| 49 | } else if (ret == 1) |
| 50 | io_u->error = EIO; /* Silent failure--don't flood stderr */ |
| 51 | return ret; |
| 52 | } |
| 53 | |
| 54 | static int fio_mtd_queue(struct thread_data *td, struct io_u *io_u) |
| 55 | { |
| 56 | struct fio_file *f = io_u->file; |
| 57 | struct fio_mtd_data *fmd = FILE_ENG_DATA(f); |
| 58 | int local_offs = 0; |
| 59 | int ret; |
| 60 | |
| 61 | fio_ro_check(td, io_u); |
| 62 | |
| 63 | /* |
| 64 | * Errors tend to pertain to particular erase blocks, so divide up |
| 65 | * I/O to erase block size. |
| 66 | * If an error is encountered, log it and keep going onto the next |
| 67 | * block because the error probably just pertains to that block. |
| 68 | * TODO(dehrenberg): Divide up reads and writes into page-sized |
| 69 | * operations to get more fine-grained information about errors. |
| 70 | */ |
| 71 | while (local_offs < io_u->buflen) { |
| 72 | int eb = (io_u->offset + local_offs) / fmd->info.eb_size; |
| 73 | int eb_offs = (io_u->offset + local_offs) % fmd->info.eb_size; |
| 74 | /* The length is the smaller of the length remaining in the |
| 75 | * buffer and the distance to the end of the erase block */ |
| 76 | int len = min((int)io_u->buflen - local_offs, |
| 77 | (int)fmd->info.eb_size - eb_offs); |
| 78 | char *buf = ((char *)io_u->buf) + local_offs; |
| 79 | |
| 80 | if (td->o.skip_bad) { |
| 81 | ret = fio_mtd_is_bad(td, fmd, io_u, eb); |
| 82 | if (ret == -1) |
| 83 | break; |
| 84 | else if (ret == 1) |
| 85 | goto next; |
| 86 | } |
| 87 | if (io_u->ddir == DDIR_READ) { |
| 88 | ret = mtd_read(&fmd->info, f->fd, eb, eb_offs, buf, len); |
| 89 | if (ret != 0) { |
| 90 | io_u->error = errno; |
| 91 | td_verror(td, errno, "mtd_read"); |
| 92 | if (fio_mtd_maybe_mark_bad(td, fmd, io_u, eb)) |
| 93 | break; |
| 94 | } |
| 95 | } else if (io_u->ddir == DDIR_WRITE) { |
| 96 | ret = mtd_write(desc, &fmd->info, f->fd, eb, |
| 97 | eb_offs, buf, len, NULL, 0, 0); |
| 98 | if (ret != 0) { |
| 99 | io_u->error = errno; |
| 100 | td_verror(td, errno, "mtd_write"); |
| 101 | if (fio_mtd_maybe_mark_bad(td, fmd, io_u, eb)) |
| 102 | break; |
| 103 | } |
| 104 | } else if (io_u->ddir == DDIR_TRIM) { |
| 105 | if (eb_offs != 0 || len != fmd->info.eb_size) { |
| 106 | io_u->error = EINVAL; |
| 107 | td_verror(td, EINVAL, |
| 108 | "trim on MTD must be erase block-aligned"); |
| 109 | } |
| 110 | ret = mtd_erase(desc, &fmd->info, f->fd, eb); |
| 111 | if (ret != 0) { |
| 112 | io_u->error = errno; |
| 113 | td_verror(td, errno, "mtd_erase"); |
| 114 | if (fio_mtd_maybe_mark_bad(td, fmd, io_u, eb)) |
| 115 | break; |
| 116 | } |
| 117 | } else { |
| 118 | io_u->error = ENOTSUP; |
| 119 | td_verror(td, io_u->error, "operation not supported on mtd"); |
| 120 | } |
| 121 | |
| 122 | next: |
| 123 | local_offs += len; |
| 124 | } |
| 125 | |
| 126 | return FIO_Q_COMPLETED; |
| 127 | } |
| 128 | |
| 129 | static int fio_mtd_open_file(struct thread_data *td, struct fio_file *f) |
| 130 | { |
| 131 | struct fio_mtd_data *fmd; |
| 132 | int ret; |
| 133 | |
| 134 | ret = generic_open_file(td, f); |
| 135 | if (ret) |
| 136 | return ret; |
| 137 | |
| 138 | fmd = calloc(1, sizeof(*fmd)); |
| 139 | if (!fmd) |
| 140 | goto err_close; |
| 141 | |
| 142 | ret = mtd_get_dev_info(desc, f->file_name, &fmd->info); |
| 143 | if (ret != 0) { |
| 144 | td_verror(td, errno, "mtd_get_dev_info"); |
| 145 | goto err_free; |
| 146 | } |
| 147 | |
| 148 | FILE_SET_ENG_DATA(f, fmd); |
| 149 | return 0; |
| 150 | |
| 151 | err_free: |
| 152 | free(fmd); |
| 153 | err_close: |
| 154 | { |
| 155 | int fio_unused __ret; |
| 156 | __ret = generic_close_file(td, f); |
| 157 | return 1; |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | static int fio_mtd_close_file(struct thread_data *td, struct fio_file *f) |
| 162 | { |
| 163 | struct fio_mtd_data *fmd = FILE_ENG_DATA(f); |
| 164 | |
| 165 | FILE_SET_ENG_DATA(f, NULL); |
| 166 | free(fmd); |
| 167 | |
| 168 | return generic_close_file(td, f); |
| 169 | } |
| 170 | |
| 171 | static int fio_mtd_get_file_size(struct thread_data *td, struct fio_file *f) |
| 172 | { |
| 173 | struct mtd_dev_info info; |
| 174 | |
| 175 | int ret = mtd_get_dev_info(desc, f->file_name, &info); |
| 176 | if (ret != 0) { |
| 177 | td_verror(td, errno, "mtd_get_dev_info"); |
| 178 | return errno; |
| 179 | } |
| 180 | f->real_file_size = info.size; |
| 181 | |
| 182 | return 0; |
| 183 | } |
| 184 | |
| 185 | static struct ioengine_ops ioengine = { |
| 186 | .name = "mtd", |
| 187 | .version = FIO_IOOPS_VERSION, |
| 188 | .queue = fio_mtd_queue, |
| 189 | .open_file = fio_mtd_open_file, |
| 190 | .close_file = fio_mtd_close_file, |
| 191 | .get_file_size = fio_mtd_get_file_size, |
| 192 | .flags = FIO_SYNCIO | FIO_NOEXTEND, |
| 193 | }; |
| 194 | |
| 195 | static void fio_init fio_mtd_register(void) |
| 196 | { |
| 197 | desc = libmtd_open(); |
| 198 | register_ioengine(&ioengine); |
| 199 | } |
| 200 | |
| 201 | static void fio_exit fio_mtd_unregister(void) |
| 202 | { |
| 203 | unregister_ioengine(&ioengine); |
| 204 | libmtd_close(desc); |
| 205 | desc = NULL; |
| 206 | } |
| 207 | |
| 208 | |
| 209 | |