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