[01211720] | 1 | /* |
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| 2 | * Copyright (c) 2012 embedded brains GmbH. All rights reserved. |
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| 3 | * |
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| 4 | * embedded brains GmbH |
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| 5 | * Obere Lagerstr. 30 |
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| 6 | * 82178 Puchheim |
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| 7 | * Germany |
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| 8 | * <rtems@embedded-brains.de> |
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| 9 | * |
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| 10 | * The license and distribution terms for this file may be |
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| 11 | * found in the file LICENSE in this distribution or at |
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| 12 | * http://www.rtems.com/license/LICENSE. |
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| 13 | */ |
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| 14 | |
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| 15 | #if HAVE_CONFIG_H |
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| 16 | #include "config.h" |
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| 17 | #endif |
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| 18 | |
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| 19 | #include <sys/stat.h> |
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| 20 | #include <stdlib.h> |
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| 21 | #include <unistd.h> |
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| 22 | #include <fcntl.h> |
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| 23 | #include <string.h> |
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| 24 | |
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| 25 | #include <rtems/blkdev.h> |
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| 26 | #include <rtems/bdbuf.h> |
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| 27 | #include <rtems/imfs.h> |
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| 28 | |
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| 29 | typedef struct { |
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| 30 | rtems_disk_device dd; |
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| 31 | int fd; |
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| 32 | } rtems_blkdev_imfs_context; |
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| 33 | |
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| 34 | static ssize_t rtems_blkdev_imfs_read( |
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| 35 | rtems_libio_t *iop, |
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| 36 | void *buffer, |
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| 37 | size_t count |
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| 38 | ) |
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| 39 | { |
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| 40 | int rv; |
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[40284de] | 41 | rtems_blkdev_imfs_context *ctx = IMFS_generic_get_context_by_iop(iop); |
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| 42 | rtems_disk_device *dd = &ctx->dd; |
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[01211720] | 43 | ssize_t remaining = (ssize_t) count; |
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| 44 | off_t offset = iop->offset; |
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| 45 | ssize_t block_size = (ssize_t) rtems_disk_get_block_size(dd); |
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| 46 | rtems_blkdev_bnum block = (rtems_blkdev_bnum) (offset / block_size); |
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| 47 | ssize_t block_offset = (ssize_t) (offset % block_size); |
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| 48 | char *dst = buffer; |
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| 49 | |
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| 50 | while (remaining > 0) { |
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| 51 | rtems_bdbuf_buffer *bd; |
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| 52 | rtems_status_code sc = rtems_bdbuf_read(dd, block, &bd); |
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| 53 | |
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| 54 | if (sc == RTEMS_SUCCESSFUL) { |
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| 55 | ssize_t copy = block_size - block_offset; |
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| 56 | |
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| 57 | if (copy > remaining) { |
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| 58 | copy = remaining; |
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| 59 | } |
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| 60 | |
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| 61 | memcpy(dst, (char *) bd->buffer + block_offset, (size_t) copy); |
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| 62 | |
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| 63 | sc = rtems_bdbuf_release(bd); |
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| 64 | if (sc == RTEMS_SUCCESSFUL) { |
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| 65 | block_offset = 0; |
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| 66 | remaining -= copy; |
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| 67 | dst += copy; |
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| 68 | ++block; |
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| 69 | } else { |
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| 70 | remaining = -1; |
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| 71 | } |
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| 72 | } else { |
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| 73 | remaining = -1; |
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| 74 | } |
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| 75 | } |
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| 76 | |
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| 77 | if (remaining >= 0) { |
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[53da07e] | 78 | iop->offset += count; |
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[01211720] | 79 | rv = (ssize_t) count; |
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| 80 | } else { |
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| 81 | errno = EIO; |
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| 82 | rv = -1; |
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| 83 | } |
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| 84 | |
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| 85 | return rv; |
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| 86 | } |
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| 87 | |
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| 88 | static ssize_t rtems_blkdev_imfs_write( |
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| 89 | rtems_libio_t *iop, |
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| 90 | const void *buffer, |
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| 91 | size_t count |
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| 92 | ) |
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| 93 | { |
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| 94 | int rv; |
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[40284de] | 95 | rtems_blkdev_imfs_context *ctx = IMFS_generic_get_context_by_iop(iop); |
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| 96 | rtems_disk_device *dd = &ctx->dd; |
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[01211720] | 97 | ssize_t remaining = (ssize_t) count; |
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| 98 | off_t offset = iop->offset; |
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| 99 | ssize_t block_size = (ssize_t) rtems_disk_get_block_size(dd); |
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| 100 | rtems_blkdev_bnum block = (rtems_blkdev_bnum) (offset / block_size); |
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| 101 | ssize_t block_offset = (ssize_t) (offset % block_size); |
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| 102 | const char *src = buffer; |
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| 103 | |
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| 104 | while (remaining > 0) { |
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| 105 | rtems_status_code sc; |
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| 106 | rtems_bdbuf_buffer *bd; |
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| 107 | |
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| 108 | if (block_offset == 0 && remaining >= block_size) { |
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| 109 | sc = rtems_bdbuf_get(dd, block, &bd); |
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| 110 | } else { |
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| 111 | sc = rtems_bdbuf_read(dd, block, &bd); |
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| 112 | } |
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| 113 | |
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| 114 | if (sc == RTEMS_SUCCESSFUL) { |
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| 115 | ssize_t copy = block_size - block_offset; |
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| 116 | |
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| 117 | if (copy > remaining) { |
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| 118 | copy = remaining; |
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| 119 | } |
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| 120 | |
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| 121 | memcpy((char *) bd->buffer + block_offset, src, (size_t) copy); |
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| 122 | |
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| 123 | sc = rtems_bdbuf_release_modified(bd); |
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| 124 | if (sc == RTEMS_SUCCESSFUL) { |
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| 125 | block_offset = 0; |
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| 126 | remaining -= copy; |
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| 127 | src += copy; |
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| 128 | ++block; |
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| 129 | } else { |
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| 130 | remaining = -1; |
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| 131 | } |
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| 132 | } else { |
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| 133 | remaining = -1; |
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| 134 | } |
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| 135 | } |
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| 136 | |
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| 137 | if (remaining >= 0) { |
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[53da07e] | 138 | iop->offset += count; |
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[01211720] | 139 | rv = (ssize_t) count; |
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| 140 | } else { |
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| 141 | errno = EIO; |
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| 142 | rv = -1; |
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| 143 | } |
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| 144 | |
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| 145 | return rv; |
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| 146 | } |
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| 147 | |
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| 148 | static int rtems_blkdev_imfs_ioctl( |
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| 149 | rtems_libio_t *iop, |
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| 150 | uint32_t request, |
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| 151 | void *buffer |
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| 152 | ) |
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| 153 | { |
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| 154 | int rv = 0; |
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| 155 | |
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| 156 | if (request != RTEMS_BLKIO_REQUEST) { |
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| 157 | rtems_blkdev_imfs_context *ctx = IMFS_generic_get_context_by_iop(iop); |
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| 158 | rtems_disk_device *dd = &ctx->dd; |
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| 159 | |
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| 160 | rv = (*dd->ioctl)(dd, request, buffer); |
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| 161 | } else { |
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| 162 | /* |
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| 163 | * It is not allowed to directly access the driver circumventing the cache. |
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| 164 | */ |
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| 165 | errno = EINVAL; |
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| 166 | rv = -1; |
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| 167 | } |
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| 168 | |
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| 169 | return rv; |
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| 170 | } |
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| 171 | |
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| 172 | static int rtems_blkdev_imfs_fstat( |
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| 173 | const rtems_filesystem_location_info_t *loc, |
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| 174 | struct stat *buf |
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| 175 | ) |
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| 176 | { |
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[40284de] | 177 | rtems_blkdev_imfs_context *ctx = |
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[01211720] | 178 | IMFS_generic_get_context_by_location(loc); |
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[40284de] | 179 | rtems_disk_device *dd = &ctx->dd; |
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[01211720] | 180 | |
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| 181 | buf->st_rdev = rtems_disk_get_device_identifier(dd); |
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| 182 | buf->st_blksize = rtems_disk_get_block_size(dd); |
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| 183 | buf->st_blocks = rtems_disk_get_block_count(dd); |
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| 184 | |
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| 185 | return IMFS_stat(loc, buf); |
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| 186 | } |
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| 187 | |
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| 188 | static int rtems_blkdev_imfs_fsync_or_fdatasync( |
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| 189 | rtems_libio_t *iop |
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| 190 | ) |
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| 191 | { |
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| 192 | int rv = 0; |
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[40284de] | 193 | rtems_blkdev_imfs_context *ctx = IMFS_generic_get_context_by_iop(iop); |
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| 194 | rtems_disk_device *dd = &ctx->dd; |
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[01211720] | 195 | rtems_status_code sc = rtems_bdbuf_syncdev(dd); |
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| 196 | |
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| 197 | if (sc != RTEMS_SUCCESSFUL) { |
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| 198 | errno = EIO; |
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| 199 | rv = -1; |
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| 200 | } |
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| 201 | |
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| 202 | return rv; |
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| 203 | } |
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| 204 | |
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| 205 | static const rtems_filesystem_file_handlers_r rtems_blkdev_imfs_node = { |
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| 206 | .open_h = rtems_filesystem_default_open, |
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| 207 | .close_h = rtems_filesystem_default_close, |
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| 208 | .read_h = rtems_blkdev_imfs_read, |
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| 209 | .write_h = rtems_blkdev_imfs_write, |
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| 210 | .ioctl_h = rtems_blkdev_imfs_ioctl, |
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[30d4124] | 211 | .lseek_h = rtems_filesystem_default_lseek_file, |
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[01211720] | 212 | .fstat_h = rtems_blkdev_imfs_fstat, |
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| 213 | .ftruncate_h = rtems_filesystem_default_ftruncate, |
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| 214 | .fsync_h = rtems_blkdev_imfs_fsync_or_fdatasync, |
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| 215 | .fdatasync_h = rtems_blkdev_imfs_fsync_or_fdatasync, |
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| 216 | .fcntl_h = rtems_filesystem_default_fcntl |
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| 217 | }; |
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| 218 | |
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| 219 | static IMFS_jnode_t *rtems_blkdev_imfs_initialize( |
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| 220 | IMFS_jnode_t *node, |
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| 221 | const IMFS_types_union *info |
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| 222 | ) |
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| 223 | { |
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| 224 | rtems_blkdev_imfs_context *ctx; |
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| 225 | rtems_disk_device *dd; |
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| 226 | |
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| 227 | node = IMFS_node_initialize_generic(node, info); |
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| 228 | |
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| 229 | ctx = IMFS_generic_get_context_by_node(node); |
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| 230 | dd = &ctx->dd; |
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| 231 | dd->dev = IMFS_generic_get_device_identifier_by_node(node); |
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| 232 | |
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| 233 | return node; |
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| 234 | } |
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| 235 | |
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| 236 | static IMFS_jnode_t *rtems_blkdev_imfs_destroy(IMFS_jnode_t *node) |
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| 237 | { |
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| 238 | rtems_blkdev_imfs_context *ctx = IMFS_generic_get_context_by_node(node); |
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| 239 | rtems_disk_device *dd = &ctx->dd; |
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| 240 | |
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| 241 | rtems_bdbuf_syncdev(dd); |
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| 242 | rtems_bdbuf_purge_dev(dd); |
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| 243 | |
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| 244 | if (ctx->fd >= 0) { |
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| 245 | close(ctx->fd); |
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| 246 | } else { |
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| 247 | (*dd->ioctl)(dd, RTEMS_BLKIO_DELETED, NULL); |
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| 248 | } |
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| 249 | |
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| 250 | free(ctx); |
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| 251 | |
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| 252 | return node; |
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| 253 | } |
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| 254 | |
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| 255 | static const IMFS_node_control rtems_blkdev_imfs_control = { |
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| 256 | .imfs_type = IMFS_GENERIC, |
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| 257 | .handlers = &rtems_blkdev_imfs_node, |
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| 258 | .node_initialize = rtems_blkdev_imfs_initialize, |
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| 259 | .node_remove = IMFS_node_remove_default, |
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| 260 | .node_destroy = rtems_blkdev_imfs_destroy |
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| 261 | }; |
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| 262 | |
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| 263 | rtems_status_code rtems_blkdev_create( |
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| 264 | const char *device, |
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| 265 | uint32_t block_size, |
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| 266 | rtems_blkdev_bnum block_count, |
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| 267 | rtems_block_device_ioctl handler, |
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| 268 | void *driver_data |
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| 269 | ) |
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| 270 | { |
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| 271 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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[73c09b3b] | 272 | rtems_blkdev_imfs_context *ctx = malloc(sizeof(*ctx)); |
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[01211720] | 273 | |
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[73c09b3b] | 274 | if (ctx != NULL) { |
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| 275 | sc = rtems_disk_init_phys( |
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| 276 | &ctx->dd, |
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| 277 | block_size, |
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| 278 | block_count, |
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| 279 | handler, |
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| 280 | driver_data |
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| 281 | ); |
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[01211720] | 282 | |
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[73c09b3b] | 283 | ctx->fd = -1; |
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[01211720] | 284 | |
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[73c09b3b] | 285 | if (sc == RTEMS_SUCCESSFUL) { |
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| 286 | int rv = IMFS_make_generic_node( |
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| 287 | device, |
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| 288 | S_IFBLK | S_IRWXU | S_IRWXG | S_IRWXO, |
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| 289 | &rtems_blkdev_imfs_control, |
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| 290 | ctx |
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| 291 | ); |
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| 292 | |
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| 293 | if (rv != 0) { |
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[01211720] | 294 | free(ctx); |
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[73c09b3b] | 295 | sc = RTEMS_UNSATISFIED; |
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[01211720] | 296 | } |
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| 297 | } else { |
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[73c09b3b] | 298 | free(ctx); |
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[01211720] | 299 | } |
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| 300 | } else { |
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[73c09b3b] | 301 | sc = RTEMS_NO_MEMORY; |
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[01211720] | 302 | } |
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| 303 | |
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| 304 | return sc; |
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| 305 | } |
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| 306 | |
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| 307 | rtems_status_code rtems_blkdev_create_partition( |
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| 308 | const char *partition, |
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| 309 | const char *device, |
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| 310 | rtems_blkdev_bnum block_begin, |
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| 311 | rtems_blkdev_bnum block_count |
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| 312 | ) |
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| 313 | { |
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| 314 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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| 315 | int fd = open(device, O_RDWR); |
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| 316 | |
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| 317 | if (fd >= 0) { |
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| 318 | int rv; |
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| 319 | struct stat st; |
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| 320 | |
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| 321 | rv = fstat(fd, &st); |
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| 322 | if (rv == 0 && S_ISBLK(st.st_mode)) { |
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[73c09b3b] | 323 | rtems_disk_device *phys_dd; |
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[01211720] | 324 | |
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[73c09b3b] | 325 | rv = rtems_disk_fd_get_disk_device(fd, &phys_dd); |
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[01211720] | 326 | if (rv == 0) { |
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[73c09b3b] | 327 | rtems_blkdev_imfs_context *ctx = malloc(sizeof(*ctx)); |
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[01211720] | 328 | |
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[73c09b3b] | 329 | if (ctx != NULL) { |
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| 330 | sc = rtems_disk_init_log( |
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| 331 | &ctx->dd, |
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| 332 | phys_dd, |
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| 333 | block_begin, |
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| 334 | block_count |
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| 335 | ); |
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[01211720] | 336 | |
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[73c09b3b] | 337 | if (sc == RTEMS_SUCCESSFUL) { |
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[01211720] | 338 | ctx->fd = fd; |
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| 339 | |
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| 340 | rv = IMFS_make_generic_node( |
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| 341 | partition, |
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| 342 | S_IFBLK | S_IRWXU | S_IRWXG | S_IRWXO, |
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| 343 | &rtems_blkdev_imfs_control, |
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| 344 | ctx |
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| 345 | ); |
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| 346 | |
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| 347 | if (rv != 0) { |
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| 348 | free(ctx); |
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| 349 | sc = RTEMS_UNSATISFIED; |
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| 350 | } |
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| 351 | } else { |
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[73c09b3b] | 352 | free(ctx); |
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[01211720] | 353 | } |
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| 354 | } else { |
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[73c09b3b] | 355 | sc = RTEMS_NO_MEMORY; |
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[01211720] | 356 | } |
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| 357 | } else { |
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| 358 | sc = RTEMS_NOT_IMPLEMENTED; |
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| 359 | } |
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| 360 | } else { |
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| 361 | sc = RTEMS_INVALID_NODE; |
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| 362 | } |
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| 363 | |
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| 364 | if (sc != RTEMS_SUCCESSFUL) { |
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| 365 | close(fd); |
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| 366 | } |
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| 367 | } else { |
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| 368 | sc = RTEMS_INVALID_ID; |
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| 369 | } |
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| 370 | |
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| 371 | return sc; |
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| 372 | } |
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