[8b96149] | 1 | /* |
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| 2 | * blkdev.h - block device driver generic support |
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[e51bd96] | 3 | * |
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| 4 | * Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia |
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| 5 | * Author: Victor V. Vengerov <vvv@oktet.ru> |
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| 6 | * |
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| 7 | * @(#) $Id$ |
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| 8 | */ |
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| 9 | |
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[006fa1ef] | 10 | #if HAVE_CONFIG_H |
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| 11 | #include "config.h" |
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| 12 | #endif |
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| 13 | |
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[228587bb] | 14 | #include <string.h> |
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| 15 | |
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[e51bd96] | 16 | #include <rtems.h> |
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| 17 | #include <rtems/libio.h> |
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| 18 | #include <sys/ioctl.h> |
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| 19 | |
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| 20 | #include "rtems/diskdevs.h" |
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| 21 | #include "rtems/bdbuf.h" |
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| 22 | |
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| 23 | /* rtems_blkdev_generic_read -- |
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| 24 | * Generic block device read primitive. Implemented using block device |
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| 25 | * buffer management primitives. |
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| 26 | */ |
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| 27 | rtems_device_driver |
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| 28 | rtems_blkdev_generic_read( |
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| 29 | rtems_device_major_number major, |
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| 30 | rtems_device_minor_number minor, |
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| 31 | void * arg) |
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| 32 | { |
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| 33 | rtems_libio_rw_args_t *args = arg; |
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| 34 | int block_size_log2; |
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| 35 | int block_size; |
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[ce92867b] | 36 | unsigned char *buf; |
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[e51bd96] | 37 | unsigned int count; |
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| 38 | unsigned int block; |
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| 39 | unsigned int blkofs; |
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| 40 | dev_t dev; |
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| 41 | disk_device *dd; |
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[048dcd2b] | 42 | |
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[e51bd96] | 43 | dev = rtems_filesystem_make_dev_t(major, minor); |
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| 44 | dd = rtems_disk_lookup(dev); |
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| 45 | if (dd == NULL) |
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| 46 | return RTEMS_INVALID_NUMBER; |
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[048dcd2b] | 47 | |
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[e51bd96] | 48 | block_size_log2 = dd->block_size_log2; |
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| 49 | block_size = dd->block_size; |
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[048dcd2b] | 50 | |
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[e51bd96] | 51 | buf = args->buffer; |
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| 52 | count = args->count; |
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| 53 | args->bytes_moved = 0; |
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[048dcd2b] | 54 | |
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[e51bd96] | 55 | block = args->offset >> block_size_log2; |
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| 56 | blkofs = args->offset & (block_size - 1); |
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[048dcd2b] | 57 | |
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[e51bd96] | 58 | while (count > 0) |
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| 59 | { |
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| 60 | bdbuf_buffer *diskbuf; |
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| 61 | int copy; |
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| 62 | rtems_status_code rc; |
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[048dcd2b] | 63 | |
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[e51bd96] | 64 | rc = rtems_bdbuf_read(dev, block, &diskbuf); |
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| 65 | if (rc != RTEMS_SUCCESSFUL) |
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| 66 | return rc; |
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| 67 | copy = block_size - blkofs; |
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| 68 | if (copy > count) |
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| 69 | copy = count; |
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| 70 | memcpy(buf, (char *)diskbuf->buffer + blkofs, copy); |
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| 71 | rc = rtems_bdbuf_release(diskbuf); |
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| 72 | args->bytes_moved += copy; |
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| 73 | if (rc != RTEMS_SUCCESSFUL) |
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| 74 | return rc; |
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| 75 | count -= copy; |
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| 76 | buf += copy; |
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| 77 | blkofs = 0; |
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| 78 | block++; |
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| 79 | } |
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| 80 | return RTEMS_SUCCESSFUL; |
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| 81 | } |
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| 82 | |
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| 83 | /* rtems_blkdev_generic_write -- |
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| 84 | * Generic block device write primitive. Implemented using block device |
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[8b96149] | 85 | * buffer management primitives. |
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[e51bd96] | 86 | */ |
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| 87 | rtems_device_driver |
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| 88 | rtems_blkdev_generic_write( |
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| 89 | rtems_device_major_number major, |
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| 90 | rtems_device_minor_number minor, |
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| 91 | void * arg) |
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| 92 | { |
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| 93 | rtems_libio_rw_args_t *args = arg; |
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| 94 | int block_size_log2; |
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| 95 | int block_size; |
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[ce92867b] | 96 | unsigned char *buf; |
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[e51bd96] | 97 | unsigned int count; |
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| 98 | unsigned int block; |
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| 99 | unsigned int blkofs; |
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| 100 | dev_t dev; |
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| 101 | rtems_status_code rc; |
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| 102 | disk_device *dd; |
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[048dcd2b] | 103 | |
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[e51bd96] | 104 | dev = rtems_filesystem_make_dev_t(major, minor); |
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| 105 | dd = rtems_disk_lookup(dev); |
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| 106 | if (dd == NULL) |
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| 107 | return RTEMS_INVALID_NUMBER; |
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[048dcd2b] | 108 | |
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[e51bd96] | 109 | block_size_log2 = dd->block_size_log2; |
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| 110 | block_size = dd->block_size; |
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[048dcd2b] | 111 | |
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[e51bd96] | 112 | buf = args->buffer; |
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| 113 | count = args->count; |
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| 114 | args->bytes_moved = 0; |
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[048dcd2b] | 115 | |
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[e51bd96] | 116 | block = args->offset >> block_size_log2; |
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| 117 | blkofs = args->offset & (block_size - 1); |
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[048dcd2b] | 118 | |
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[e51bd96] | 119 | while (count > 0) |
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| 120 | { |
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| 121 | bdbuf_buffer *diskbuf; |
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| 122 | int copy; |
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[048dcd2b] | 123 | |
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[635652e] | 124 | if ((blkofs == 0) && (count >= block_size)) |
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[e51bd96] | 125 | rc = rtems_bdbuf_get(dev, block, &diskbuf); |
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| 126 | else |
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| 127 | rc = rtems_bdbuf_read(dev, block, &diskbuf); |
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| 128 | if (rc != RTEMS_SUCCESSFUL) |
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| 129 | return rc; |
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[048dcd2b] | 130 | |
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[e51bd96] | 131 | copy = block_size - blkofs; |
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| 132 | if (copy > count) |
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| 133 | copy = count; |
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| 134 | memcpy((char *)diskbuf->buffer + blkofs, buf, copy); |
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| 135 | args->bytes_moved += copy; |
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[048dcd2b] | 136 | |
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[e51bd96] | 137 | rc = rtems_bdbuf_release_modified(diskbuf); |
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| 138 | if (rc != RTEMS_SUCCESSFUL) |
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| 139 | return rc; |
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[048dcd2b] | 140 | |
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[e51bd96] | 141 | count -= copy; |
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| 142 | buf += copy; |
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| 143 | blkofs = 0; |
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| 144 | block++; |
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| 145 | } |
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| 146 | return RTEMS_SUCCESSFUL; |
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| 147 | } |
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| 148 | |
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| 149 | /* blkdev_generic_open -- |
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| 150 | * Generic block device open primitive. |
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| 151 | */ |
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| 152 | rtems_device_driver |
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| 153 | rtems_blkdev_generic_open( |
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| 154 | rtems_device_major_number major, |
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| 155 | rtems_device_minor_number minor, |
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| 156 | void * arg) |
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| 157 | { |
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| 158 | dev_t dev; |
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| 159 | disk_device *dd; |
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[048dcd2b] | 160 | |
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[e51bd96] | 161 | dev = rtems_filesystem_make_dev_t(major, minor); |
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| 162 | dd = rtems_disk_lookup(dev); |
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| 163 | if (dd == NULL) |
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| 164 | return RTEMS_INVALID_NUMBER; |
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[048dcd2b] | 165 | |
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[e51bd96] | 166 | dd->uses++; |
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[048dcd2b] | 167 | |
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[e51bd96] | 168 | rtems_disk_release(dd); |
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[048dcd2b] | 169 | |
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[e51bd96] | 170 | return RTEMS_SUCCESSFUL; |
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| 171 | } |
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| 172 | |
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| 173 | |
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| 174 | /* blkdev_generic_close -- |
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| 175 | * Generic block device close primitive. |
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| 176 | */ |
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| 177 | rtems_device_driver |
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| 178 | rtems_blkdev_generic_close( |
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| 179 | rtems_device_major_number major, |
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| 180 | rtems_device_minor_number minor, |
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| 181 | void * arg) |
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| 182 | { |
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| 183 | dev_t dev; |
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| 184 | disk_device *dd; |
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[048dcd2b] | 185 | |
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[e51bd96] | 186 | dev = rtems_filesystem_make_dev_t(major, minor); |
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| 187 | dd = rtems_disk_lookup(dev); |
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| 188 | if (dd == NULL) |
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| 189 | return RTEMS_INVALID_NUMBER; |
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[048dcd2b] | 190 | |
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[e51bd96] | 191 | dd->uses--; |
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[048dcd2b] | 192 | |
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[e51bd96] | 193 | rtems_disk_release(dd); |
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[048dcd2b] | 194 | |
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[e51bd96] | 195 | return RTEMS_SUCCESSFUL; |
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| 196 | } |
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| 197 | |
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| 198 | /* blkdev_generic_ioctl -- |
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| 199 | * Generic block device ioctl primitive. |
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| 200 | */ |
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| 201 | rtems_device_driver |
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| 202 | rtems_blkdev_generic_ioctl( |
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| 203 | rtems_device_major_number major, |
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| 204 | rtems_device_minor_number minor, |
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| 205 | void * arg) |
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| 206 | { |
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| 207 | rtems_libio_ioctl_args_t *args = arg; |
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| 208 | dev_t dev; |
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| 209 | disk_device *dd; |
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| 210 | int rc; |
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[048dcd2b] | 211 | |
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[e51bd96] | 212 | dev = rtems_filesystem_make_dev_t(major, minor); |
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| 213 | dd = rtems_disk_lookup(dev); |
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| 214 | if (dd == NULL) |
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| 215 | return RTEMS_INVALID_NUMBER; |
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[048dcd2b] | 216 | |
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[e51bd96] | 217 | switch (args->command) |
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| 218 | { |
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| 219 | case BLKIO_GETBLKSIZE: |
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| 220 | args->ioctl_return = dd->block_size; |
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| 221 | break; |
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[048dcd2b] | 222 | |
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[e51bd96] | 223 | case BLKIO_GETSIZE: |
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| 224 | args->ioctl_return = dd->size; |
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| 225 | break; |
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| 226 | |
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| 227 | case BLKIO_SYNCDEV: |
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| 228 | rc = rtems_bdbuf_syncdev(dd->dev); |
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| 229 | args->ioctl_return = (rc == RTEMS_SUCCESSFUL ? 0 : -1); |
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| 230 | break; |
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[048dcd2b] | 231 | |
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[e51bd96] | 232 | case BLKIO_REQUEST: |
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| 233 | { |
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| 234 | blkdev_request *req = args->buffer; |
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| 235 | req->start += dd->start; |
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[8b96149] | 236 | args->ioctl_return = dd->ioctl(dd->phys_dev->dev, args->command, |
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[e51bd96] | 237 | req); |
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| 238 | break; |
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| 239 | } |
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[048dcd2b] | 240 | |
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[e51bd96] | 241 | default: |
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[8b96149] | 242 | args->ioctl_return = dd->ioctl(dd->phys_dev->dev, args->command, |
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[e51bd96] | 243 | args->buffer); |
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| 244 | break; |
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| 245 | } |
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| 246 | rtems_disk_release(dd); |
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[048dcd2b] | 247 | |
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[e51bd96] | 248 | return RTEMS_SUCCESSFUL; |
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| 249 | } |
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