1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Flash Disk Block Device Implementation |
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5 | * @ingroup libblock |
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6 | */ |
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7 | |
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8 | /* |
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9 | * Copyright (C) 2007 Chris Johns |
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10 | * |
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11 | * The license and distribution terms for this file may be |
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12 | * found in the file LICENSE in this distribution or at |
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13 | * http://www.rtems.com/license/LICENSE. |
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14 | */ |
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15 | |
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16 | /* |
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17 | * The use of pages can vary. The rtems_fdisk_seg_*_page set |
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18 | * routines use an absolute page number relative to the segment |
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19 | * while all other page numbers are relative to the number of |
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20 | * page descriptor pages a segment has. You need to add the |
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21 | * number of page descriptor pages (pages_desc) to the page number |
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22 | * when call the rtems_fdisk_seg_*_page functions. |
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23 | * |
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24 | * You must always show the page number as relative in any trace |
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25 | * or error message as device-segment-page and if you have to |
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26 | * the page number as absolute use device-segment~page. This |
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27 | * can be seen in the page copy routine. |
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28 | * |
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29 | * The code is like this to avoid needing the pass the pages_desc |
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30 | * value around. It is only used in selected places and so the |
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31 | * extra parameter was avoided. |
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32 | */ |
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33 | |
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34 | #if HAVE_CONFIG_H |
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35 | #include "config.h" |
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36 | #endif |
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37 | |
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38 | #include <rtems.h> |
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39 | #include <rtems/libio.h> |
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40 | #include <errno.h> |
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41 | #include <stdlib.h> |
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42 | #include <stdio.h> |
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43 | #include <string.h> |
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44 | #include <inttypes.h> |
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45 | |
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46 | #include "rtems/blkdev.h" |
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47 | #include "rtems/diskdevs.h" |
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48 | #include "rtems/flashdisk.h" |
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49 | |
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50 | /** |
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51 | * Control tracing. It can be compiled out of the code for small |
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52 | * footprint targets. Leave in by default. |
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53 | */ |
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54 | #if !defined (RTEMS_FDISK_TRACE) |
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55 | #define RTEMS_FDISK_TRACE 1 |
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56 | #endif |
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57 | |
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58 | /** |
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59 | * The start of a segment has a segment control table. This hold the CRC and |
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60 | * block number for the page. |
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61 | * |
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62 | * @todo A sequence number for the block could be added. This would |
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63 | * mean a larger descriptor size. Need to make the sequence |
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64 | * large like 20+ bits so a large file system would not have |
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65 | * more blocks available than the sequence number. |
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66 | */ |
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67 | typedef struct rtems_fdisk_page_desc |
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68 | { |
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69 | uint16_t crc; /**< The page's checksum. */ |
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70 | uint16_t flags; /**< The flags for the page. */ |
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71 | uint32_t block; /**< The block number. */ |
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72 | } rtems_fdisk_page_desc; |
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73 | |
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74 | /** |
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75 | * Flag the page as active. |
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76 | */ |
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77 | #define RTEMS_FDISK_PAGE_ACTIVE (1 << 0) |
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78 | |
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79 | /** |
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80 | * Flag the page as used. |
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81 | */ |
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82 | #define RTEMS_FDISK_PAGE_USED (1 << 1) |
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83 | |
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84 | /** |
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85 | * Flash Segment Control holds the pointer to the segment, number of |
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86 | * pages, various page stats and the memory copy of the page descriptors. |
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87 | */ |
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88 | typedef struct rtems_fdisk_segment_ctl |
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89 | { |
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90 | /** |
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91 | * Segments with available pages are maintained as a linked list. |
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92 | */ |
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93 | struct rtems_fdisk_segment_ctl* next; |
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94 | |
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95 | /** |
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96 | * The descriptor provided by the low-level driver. |
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97 | */ |
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98 | const rtems_fdisk_segment_desc* descriptor; |
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99 | |
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100 | /** |
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101 | * The device this segment resides on. |
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102 | */ |
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103 | uint32_t device; |
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104 | |
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105 | /** |
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106 | * The segment in the device. This must be within the |
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107 | * segment descriptor. |
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108 | */ |
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109 | uint32_t segment; |
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110 | |
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111 | /** |
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112 | * The in-memory ocpy of the page descriptors found at |
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113 | * the start of the segment in the flash device. |
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114 | */ |
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115 | rtems_fdisk_page_desc* page_descriptors; |
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116 | |
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117 | /* |
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118 | * Page stats. |
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119 | * |
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120 | * A bad page does not checksum or is not erased or has invalid flags. |
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121 | */ |
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122 | uint32_t pages; /**< Total number of pages in the segment. */ |
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123 | uint32_t pages_desc; /**< Number of pages used for page descriptors. */ |
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124 | uint32_t pages_active; /**< Number of pages flagged as active. */ |
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125 | uint32_t pages_used; /**< Number of pages flagged as used. */ |
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126 | uint32_t pages_bad; /**< Number of pages detected as bad. */ |
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127 | |
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128 | uint32_t failed; /**< The segment has failed. */ |
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129 | |
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130 | uint32_t erased; /**< Counter to debugging. Wear support would |
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131 | remove this. */ |
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132 | } rtems_fdisk_segment_ctl; |
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133 | |
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134 | /** |
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135 | * Segment control table queue. |
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136 | */ |
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137 | typedef struct rtems_fdisk_segment_ctl_queue |
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138 | { |
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139 | rtems_fdisk_segment_ctl* head; |
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140 | rtems_fdisk_segment_ctl* tail; |
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141 | uint32_t count; |
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142 | } rtems_fdisk_segment_ctl_queue; |
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143 | |
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144 | /** |
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145 | * Flash Device Control holds the segment controls |
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146 | */ |
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147 | typedef struct rtems_fdisk_device_ctl |
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148 | { |
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149 | rtems_fdisk_segment_ctl* segments; /**< Segment controls. */ |
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150 | uint32_t segment_count; /**< Segment control count. */ |
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151 | const rtems_fdisk_device_desc* descriptor; /**< Device descriptor. */ |
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152 | } rtems_fdisk_device_ctl; |
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153 | |
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154 | /** |
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155 | * The Block control holds the segment and page with the data. |
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156 | */ |
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157 | typedef struct rtems_fdisk_block_ctl |
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158 | { |
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159 | rtems_fdisk_segment_ctl* segment; /**< The segment with the block. */ |
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160 | uint32_t page; /**< The page in the segment. */ |
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161 | } rtems_fdisk_block_ctl; |
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162 | |
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163 | /** |
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164 | * The virtual block table holds the mapping for blocks as seen by the disk |
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165 | * drivers to the device, segment and page numbers of the physical device. |
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166 | */ |
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167 | typedef struct rtems_flashdisk |
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168 | { |
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169 | rtems_device_major_number major; /**< The driver's major number. */ |
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170 | rtems_device_minor_number minor; /**< The driver's minor number. */ |
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171 | |
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172 | uint32_t flags; /**< configuration flags. */ |
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173 | |
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174 | uint32_t compact_segs; /**< Max segs to compact at once. */ |
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175 | uint32_t avail_compact_segs; /**< The number of segments when |
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176 | compaction occurs when writing. */ |
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177 | |
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178 | uint32_t block_size; /**< The block size for this disk. */ |
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179 | rtems_fdisk_block_ctl* blocks; /**< The block to segment-page |
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180 | mappings. */ |
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181 | uint32_t block_count; /**< The number of avail. blocks. */ |
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182 | uint32_t unavail_blocks; /**< The number of unavail blocks. */ |
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183 | uint32_t starvation_threshold; /**< Erased blocks starvation threshold. */ |
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184 | uint32_t erased_blocks; /**< The number of erased blocks. */ |
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185 | |
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186 | rtems_fdisk_device_ctl* devices; /**< The flash devices for this |
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187 | disk. */ |
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188 | uint32_t device_count; /**< The number of flash devices. */ |
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189 | |
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190 | rtems_fdisk_segment_ctl_queue available; /**< The queue of segments with |
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191 | available pages. */ |
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192 | rtems_fdisk_segment_ctl_queue used; /**< The list of segments with all |
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193 | pages used. */ |
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194 | rtems_fdisk_segment_ctl_queue erase; /**< The list of segments to be |
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195 | erased. */ |
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196 | rtems_fdisk_segment_ctl_queue failed; /**< The list of segments that failed |
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197 | when being erased. */ |
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198 | rtems_id lock; /**< Mutex for threading protection.*/ |
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199 | |
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200 | uint8_t* copy_buffer; /**< Copy buf used during compacting */ |
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201 | |
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202 | uint32_t info_level; /**< The info trace level. */ |
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203 | |
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204 | uint32_t starvations; /**< Erased blocks starvations counter. */ |
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205 | } rtems_flashdisk; |
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206 | |
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207 | /** |
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208 | * The array of flash disks we support. |
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209 | */ |
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210 | static rtems_flashdisk* rtems_flashdisks; |
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211 | |
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212 | /** |
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213 | * The number of flash disks we have. |
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214 | */ |
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215 | static uint32_t rtems_flashdisk_count; |
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216 | |
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217 | /** |
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218 | * The CRC16 factor table. Created during initialisation. |
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219 | */ |
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220 | static uint16_t* rtems_fdisk_crc16_factor; |
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221 | |
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222 | /** |
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223 | * Calculate the CRC16 checksum. |
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224 | * |
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225 | * @param _b The byte to checksum. |
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226 | * @param _c The current checksum. |
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227 | */ |
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228 | #define rtems_fdisk_calc_crc16(_b, _c) \ |
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229 | rtems_fdisk_crc16_factor[((_b) ^ ((_c) & 0xff)) & 0xff] ^ (((_c) >> 8) & 0xff) |
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230 | |
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231 | /** |
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232 | * Generate the CRC table. |
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233 | * |
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234 | * @param pattern The seed pattern for the table of factors. |
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235 | * @relval RTEMS_SUCCESSFUL The table was generated. |
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236 | * @retval RTEMS_NO_MEMORY The table could not be allocated from the heap. |
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237 | */ |
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238 | static rtems_status_code |
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239 | rtems_fdisk_crc16_gen_factors (uint16_t pattern) |
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240 | { |
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241 | uint32_t b; |
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242 | |
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243 | rtems_fdisk_crc16_factor = malloc (sizeof (uint16_t) * 256); |
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244 | if (!rtems_fdisk_crc16_factor) |
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245 | return RTEMS_NO_MEMORY; |
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246 | |
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247 | for (b = 0; b < 256; b++) |
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248 | { |
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249 | uint32_t i; |
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250 | uint16_t v = b; |
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251 | for (i = 8; i--;) |
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252 | v = v & 1 ? (v >> 1) ^ pattern : v >> 1; |
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253 | rtems_fdisk_crc16_factor[b] = v & 0xffff; |
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254 | } |
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255 | return RTEMS_SUCCESSFUL; |
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256 | } |
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257 | |
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258 | #if RTEMS_FDISK_TRACE |
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259 | /** |
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260 | * Print a message to the flash disk output and flush it. |
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261 | * |
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262 | * @param fd The flashdisk control structure. |
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263 | * @param format The format string. See printf for details. |
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264 | * @param ... The arguments for the format text. |
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265 | * @return int The number of bytes written to the output. |
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266 | */ |
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267 | static int |
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268 | rtems_fdisk_printf (const rtems_flashdisk* fd, const char *format, ...) |
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269 | { |
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270 | int ret = 0; |
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271 | if (fd->info_level >= 3) |
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272 | { |
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273 | va_list args; |
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274 | va_start (args, format); |
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275 | fprintf (stdout, "fdisk:"); |
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276 | ret = vfprintf (stdout, format, args); |
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277 | fprintf (stdout, "\n"); |
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278 | fflush (stdout); |
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279 | va_end (args); |
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280 | } |
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281 | return ret; |
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282 | } |
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283 | |
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284 | static bool |
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285 | rtems_fdisk_is_erased_blocks_starvation (rtems_flashdisk* fd) |
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286 | { |
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287 | bool starvation = fd->erased_blocks < fd->starvation_threshold; |
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288 | |
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289 | if (starvation) |
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290 | fd->starvations++; |
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291 | |
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292 | return starvation; |
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293 | } |
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294 | |
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295 | /** |
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296 | * Print a info message to the flash disk output and flush it. |
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297 | * |
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298 | * @param fd The flashdisk control structure. |
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299 | * @param format The format string. See printf for details. |
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300 | * @param ... The arguments for the format text. |
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301 | * @return int The number of bytes written to the output. |
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302 | */ |
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303 | static int |
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304 | rtems_fdisk_info (const rtems_flashdisk* fd, const char *format, ...) |
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305 | { |
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306 | int ret = 0; |
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307 | if (fd->info_level >= 2) |
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308 | { |
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309 | va_list args; |
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310 | va_start (args, format); |
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311 | fprintf (stdout, "fdisk:"); |
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312 | ret = vfprintf (stdout, format, args); |
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313 | fprintf (stdout, "\n"); |
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314 | fflush (stdout); |
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315 | va_end (args); |
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316 | } |
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317 | return ret; |
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318 | } |
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319 | |
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320 | /** |
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321 | * Print a warning to the flash disk output and flush it. |
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322 | * |
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323 | * @param fd The flashdisk control structure. |
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324 | * @param format The format string. See printf for details. |
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325 | * @param ... The arguments for the format text. |
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326 | * @return int The number of bytes written to the output. |
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327 | */ |
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328 | static int |
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329 | rtems_fdisk_warning (const rtems_flashdisk* fd, const char *format, ...) |
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330 | { |
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331 | int ret = 0; |
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332 | if (fd->info_level >= 1) |
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333 | { |
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334 | va_list args; |
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335 | va_start (args, format); |
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336 | fprintf (stdout, "fdisk:warning:"); |
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337 | ret = vfprintf (stdout, format, args); |
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338 | fprintf (stdout, "\n"); |
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339 | fflush (stdout); |
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340 | va_end (args); |
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341 | } |
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342 | return ret; |
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343 | } |
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344 | #endif |
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345 | |
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346 | /** |
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347 | * Print an error to the flash disk output and flush it. |
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348 | * |
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349 | * @param format The format string. See printf for details. |
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350 | * @param ... The arguments for the format text. |
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351 | * @return int The number of bytes written to the output. |
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352 | */ |
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353 | static int |
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354 | rtems_fdisk_error (const char *format, ...) |
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355 | { |
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356 | int ret; |
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357 | va_list args; |
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358 | va_start (args, format); |
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359 | fprintf (stderr, "fdisk:error:"); |
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360 | ret = vfprintf (stderr, format, args); |
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361 | fprintf (stderr, "\n"); |
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362 | fflush (stderr); |
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363 | va_end (args); |
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364 | return ret; |
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365 | } |
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366 | |
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367 | /** |
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368 | * Print an abort message, flush it then abort the program. |
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369 | * |
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370 | * @param format The format string. See printf for details. |
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371 | * @param ... The arguments for the format text. |
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372 | */ |
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373 | static void |
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374 | rtems_fdisk_abort (const char *format, ...) |
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375 | { |
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376 | va_list args; |
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377 | va_start (args, format); |
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378 | fprintf (stderr, "fdisk:abort:"); |
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379 | vfprintf (stderr, format, args); |
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380 | fprintf (stderr, "\n"); |
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381 | fflush (stderr); |
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382 | va_end (args); |
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383 | exit (1); |
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384 | } |
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385 | |
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386 | /** |
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387 | * Initialise the segment control queue. |
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388 | */ |
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389 | static void |
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390 | rtems_fdisk_segment_queue_init (rtems_fdisk_segment_ctl_queue* queue) |
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391 | { |
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392 | queue->head = queue->tail = 0; |
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393 | queue->count = 0; |
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394 | } |
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395 | |
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396 | /** |
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397 | * Push to the head of the segment control queue. |
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398 | */ |
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399 | static void |
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400 | rtems_fdisk_segment_queue_push_head (rtems_fdisk_segment_ctl_queue* queue, |
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401 | rtems_fdisk_segment_ctl* sc) |
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402 | { |
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403 | if (sc) |
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404 | { |
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405 | sc->next = queue->head; |
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406 | queue->head = sc; |
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407 | |
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408 | if (queue->tail == 0) |
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409 | queue->tail = sc; |
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410 | queue->count++; |
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411 | } |
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412 | } |
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413 | |
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414 | /** |
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415 | * Pop the head of the segment control queue. |
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416 | */ |
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417 | static rtems_fdisk_segment_ctl* |
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418 | rtems_fdisk_segment_queue_pop_head (rtems_fdisk_segment_ctl_queue* queue) |
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419 | { |
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420 | if (queue->head) |
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421 | { |
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422 | rtems_fdisk_segment_ctl* sc = queue->head; |
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423 | |
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424 | queue->head = sc->next; |
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425 | if (!queue->head) |
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426 | queue->tail = 0; |
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427 | |
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428 | queue->count--; |
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429 | |
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430 | sc->next = 0; |
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431 | |
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432 | return sc; |
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433 | } |
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434 | |
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435 | return 0; |
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436 | } |
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437 | |
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438 | /** |
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439 | * Push to the tail of the segment control queue. |
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440 | */ |
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441 | static void |
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442 | rtems_fdisk_segment_queue_push_tail (rtems_fdisk_segment_ctl_queue* queue, |
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443 | rtems_fdisk_segment_ctl* sc) |
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444 | { |
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445 | if (sc) |
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446 | { |
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447 | sc->next = 0; |
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448 | |
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449 | if (queue->head) |
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450 | { |
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451 | queue->tail->next = sc; |
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452 | queue->tail = sc; |
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453 | } |
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454 | else |
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455 | { |
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456 | queue->head = queue->tail = sc; |
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457 | } |
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458 | |
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459 | queue->count++; |
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460 | } |
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461 | } |
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462 | |
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463 | /** |
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464 | * Remove from the segment control queue. |
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465 | */ |
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466 | static void |
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467 | rtems_fdisk_segment_queue_remove (rtems_fdisk_segment_ctl_queue* queue, |
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468 | rtems_fdisk_segment_ctl* sc) |
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469 | { |
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470 | rtems_fdisk_segment_ctl* prev = 0; |
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471 | rtems_fdisk_segment_ctl* it = queue->head; |
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472 | |
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473 | /* |
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474 | * Do not change sc->next as sc could be on another queue. |
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475 | */ |
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476 | |
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477 | while (it) |
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478 | { |
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479 | if (sc == it) |
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480 | { |
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481 | if (prev == 0) |
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482 | { |
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483 | queue->head = sc->next; |
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484 | if (queue->head == 0) |
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485 | queue->tail = 0; |
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486 | } |
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487 | else |
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488 | { |
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489 | prev->next = sc->next; |
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490 | if (queue->tail == sc) |
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491 | queue->tail = prev; |
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492 | } |
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493 | sc->next = 0; |
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494 | queue->count--; |
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495 | break; |
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496 | } |
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497 | |
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498 | prev = it; |
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499 | it = it->next; |
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500 | } |
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501 | } |
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502 | |
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503 | /** |
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504 | * Insert into the segment control queue before the specific |
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505 | * segment control item. |
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506 | */ |
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507 | static void |
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508 | rtems_fdisk_segment_queue_insert_before (rtems_fdisk_segment_ctl_queue* queue, |
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509 | rtems_fdisk_segment_ctl* item, |
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510 | rtems_fdisk_segment_ctl* sc) |
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511 | { |
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512 | if (item) |
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513 | { |
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514 | rtems_fdisk_segment_ctl** prev = &queue->head; |
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515 | rtems_fdisk_segment_ctl* it = queue->head; |
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516 | |
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517 | while (it) |
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518 | { |
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519 | if (item == it) |
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520 | { |
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521 | sc->next = item; |
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522 | *prev = sc; |
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523 | queue->count++; |
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524 | return; |
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525 | } |
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526 | |
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527 | prev = &it->next; |
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528 | it = it->next; |
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529 | } |
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530 | } |
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531 | |
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532 | rtems_fdisk_segment_queue_push_tail (queue, sc); |
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533 | } |
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534 | |
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535 | /** |
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536 | * Count the number of elements on the list. |
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537 | */ |
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538 | static uint32_t |
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539 | rtems_fdisk_segment_queue_count (rtems_fdisk_segment_ctl_queue* queue) |
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540 | { |
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541 | return queue->count; |
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542 | } |
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543 | |
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544 | /** |
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545 | * Count the number of elements on the list. |
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546 | */ |
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547 | static uint32_t |
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548 | rtems_fdisk_segment_count_queue (rtems_fdisk_segment_ctl_queue* queue) |
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549 | { |
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550 | rtems_fdisk_segment_ctl* sc = queue->head; |
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551 | uint32_t count = 0; |
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552 | |
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553 | while (sc) |
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554 | { |
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555 | count++; |
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556 | sc = sc->next; |
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557 | } |
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558 | |
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559 | return count; |
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560 | } |
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561 | |
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562 | /** |
---|
563 | * See if a segment control is present on this queue. |
---|
564 | */ |
---|
565 | static bool |
---|
566 | rtems_fdisk_segment_queue_present (rtems_fdisk_segment_ctl_queue* queue, |
---|
567 | rtems_fdisk_segment_ctl* sc) |
---|
568 | { |
---|
569 | rtems_fdisk_segment_ctl* it = queue->head; |
---|
570 | |
---|
571 | while (it) |
---|
572 | { |
---|
573 | if (it == sc) |
---|
574 | return true; |
---|
575 | it = it->next; |
---|
576 | } |
---|
577 | |
---|
578 | return false; |
---|
579 | } |
---|
580 | |
---|
581 | /** |
---|
582 | * Format a string with the queue status. |
---|
583 | */ |
---|
584 | static void |
---|
585 | rtems_fdisk_queue_status (rtems_flashdisk* fd, |
---|
586 | rtems_fdisk_segment_ctl* sc, |
---|
587 | char queues[5]) |
---|
588 | { |
---|
589 | queues[0] = rtems_fdisk_segment_queue_present (&fd->available, sc) ? 'A' : '-'; |
---|
590 | queues[1] = rtems_fdisk_segment_queue_present (&fd->used, sc) ? 'U' : '-'; |
---|
591 | queues[2] = rtems_fdisk_segment_queue_present (&fd->erase, sc) ? 'E' : '-'; |
---|
592 | queues[3] = rtems_fdisk_segment_queue_present (&fd->failed, sc) ? 'F' : '-'; |
---|
593 | queues[4] = '\0'; |
---|
594 | } |
---|
595 | |
---|
596 | /** |
---|
597 | * Check if the page descriptor is erased. |
---|
598 | */ |
---|
599 | static bool |
---|
600 | rtems_fdisk_page_desc_erased (const rtems_fdisk_page_desc* pd) |
---|
601 | { |
---|
602 | return ((pd->crc == 0xffff) && |
---|
603 | (pd->flags == 0xffff) && |
---|
604 | (pd->block == 0xffffffff)) ? true : false; |
---|
605 | } |
---|
606 | |
---|
607 | /** |
---|
608 | * Check if the flags are set. The flags are inverted as we can |
---|
609 | * only set a flag by changing it from 1 to 0. |
---|
610 | */ |
---|
611 | static bool |
---|
612 | rtems_fdisk_page_desc_flags_set (rtems_fdisk_page_desc* pd, uint16_t flags) |
---|
613 | { |
---|
614 | return (pd->flags & flags) == 0 ? true : false; |
---|
615 | } |
---|
616 | |
---|
617 | /** |
---|
618 | * Check if the flags are clear. The flags are inverted as we can |
---|
619 | * only set a flag by changing it from 1 to 0. |
---|
620 | */ |
---|
621 | static bool |
---|
622 | rtems_fdisk_page_desc_flags_clear (rtems_fdisk_page_desc* pd, uint16_t flags) |
---|
623 | { |
---|
624 | return (pd->flags & flags) == flags ? true : false; |
---|
625 | } |
---|
626 | |
---|
627 | /** |
---|
628 | * Set the flags. Setting means clear the bit to 0. |
---|
629 | */ |
---|
630 | static void |
---|
631 | rtems_fdisk_page_desc_set_flags (rtems_fdisk_page_desc* pd, uint16_t flags) |
---|
632 | { |
---|
633 | pd->flags &= ~flags; |
---|
634 | } |
---|
635 | |
---|
636 | /** |
---|
637 | * Get the segment descriptor for a device and segment. There are |
---|
638 | * no range checks. |
---|
639 | */ |
---|
640 | static const rtems_fdisk_segment_desc* |
---|
641 | rtems_fdisk_seg_descriptor (const rtems_flashdisk* fd, |
---|
642 | uint32_t device, |
---|
643 | uint32_t segment) |
---|
644 | { |
---|
645 | return fd->devices[device].segments[segment].descriptor; |
---|
646 | } |
---|
647 | |
---|
648 | /** |
---|
649 | * Count the segments for a device. |
---|
650 | */ |
---|
651 | static uint32_t |
---|
652 | rtems_fdisk_count_segments (const rtems_fdisk_device_desc* dd) |
---|
653 | { |
---|
654 | uint32_t count = 0; |
---|
655 | uint32_t segment; |
---|
656 | for (segment = 0; segment < dd->segment_count; segment++) |
---|
657 | count += dd->segments[segment].count; |
---|
658 | return count; |
---|
659 | } |
---|
660 | |
---|
661 | /** |
---|
662 | * Calculate the pages in a segment give the segment size and the |
---|
663 | * page size. |
---|
664 | * |
---|
665 | * @param sd The segment descriptor. |
---|
666 | * @param page_size The page size in bytes. |
---|
667 | */ |
---|
668 | static uint32_t |
---|
669 | rtems_fdisk_pages_in_segment (const rtems_fdisk_segment_desc* sd, |
---|
670 | uint32_t page_size) |
---|
671 | { |
---|
672 | return sd->size / page_size; |
---|
673 | } |
---|
674 | |
---|
675 | /** |
---|
676 | * Calculate the number of pages needed to hold the page descriptors. |
---|
677 | * The calculation need to round up. |
---|
678 | * |
---|
679 | * The segment control contains the number of pages used as descriptors |
---|
680 | * and should be used rather than this call where possible. |
---|
681 | */ |
---|
682 | static uint32_t |
---|
683 | rtems_fdisk_page_desc_pages (const rtems_fdisk_segment_desc* sd, |
---|
684 | uint32_t page_size) |
---|
685 | { |
---|
686 | uint32_t pages = rtems_fdisk_pages_in_segment (sd, page_size); |
---|
687 | uint32_t bytes = pages * sizeof (rtems_fdisk_page_desc); |
---|
688 | return ((bytes - 1) / page_size) + 1; |
---|
689 | } |
---|
690 | |
---|
691 | /** |
---|
692 | * The number of available pages is the total pages less the |
---|
693 | * active, used and bad pages. |
---|
694 | */ |
---|
695 | static uint32_t |
---|
696 | rtems_fdisk_seg_pages_available (const rtems_fdisk_segment_ctl* sc) |
---|
697 | { |
---|
698 | return sc->pages - (sc->pages_active + sc->pages_used + sc->pages_bad); |
---|
699 | } |
---|
700 | /** |
---|
701 | * Find the next available page in a segment. |
---|
702 | */ |
---|
703 | static uint32_t |
---|
704 | rtems_fdisk_seg_next_available_page (rtems_fdisk_segment_ctl* sc) |
---|
705 | { |
---|
706 | rtems_fdisk_page_desc* pd = &sc->page_descriptors[0]; |
---|
707 | uint32_t page; |
---|
708 | |
---|
709 | for (page = 0; page < sc->pages; page++, pd++) |
---|
710 | if (rtems_fdisk_page_desc_erased (pd)) |
---|
711 | break; |
---|
712 | |
---|
713 | return page; |
---|
714 | } |
---|
715 | |
---|
716 | /** |
---|
717 | * Find the segment on the queue that has the most free pages. |
---|
718 | */ |
---|
719 | static rtems_fdisk_segment_ctl* |
---|
720 | rtems_fdisk_seg_most_available (const rtems_fdisk_segment_ctl_queue* queue) |
---|
721 | { |
---|
722 | rtems_fdisk_segment_ctl* sc = queue->head; |
---|
723 | rtems_fdisk_segment_ctl* biggest = queue->head; |
---|
724 | |
---|
725 | while (sc) |
---|
726 | { |
---|
727 | if (rtems_fdisk_seg_pages_available (sc) > |
---|
728 | rtems_fdisk_seg_pages_available (biggest)) |
---|
729 | biggest = sc; |
---|
730 | sc = sc->next; |
---|
731 | } |
---|
732 | |
---|
733 | return biggest; |
---|
734 | } |
---|
735 | |
---|
736 | /** |
---|
737 | * Is the segment all used ? |
---|
738 | */ |
---|
739 | #if 0 |
---|
740 | static bool |
---|
741 | rtems_fdisk_seg_pages_all_used (const rtems_fdisk_segment_ctl* sc) |
---|
742 | { |
---|
743 | return sc->pages == (sc->pages_used + sc->pages_bad) ? true : false; |
---|
744 | } |
---|
745 | #endif |
---|
746 | |
---|
747 | /** |
---|
748 | * Calculate the blocks in a device. This is the number of |
---|
749 | * pages less the pages hold page descriptors. This call be used |
---|
750 | * early in the initialisation process and does not rely on |
---|
751 | * the system being fully initialised. |
---|
752 | * |
---|
753 | * @param dd The device descriptor. |
---|
754 | * @param page_size The page size in bytes. |
---|
755 | */ |
---|
756 | static uint32_t |
---|
757 | rtems_fdisk_blocks_in_device (const rtems_fdisk_device_desc* dd, |
---|
758 | uint32_t page_size) |
---|
759 | { |
---|
760 | uint32_t count = 0; |
---|
761 | uint32_t s; |
---|
762 | for (s = 0; s < dd->segment_count; s++) |
---|
763 | { |
---|
764 | const rtems_fdisk_segment_desc* sd = &dd->segments[s]; |
---|
765 | count += |
---|
766 | (rtems_fdisk_pages_in_segment (sd, page_size) - |
---|
767 | rtems_fdisk_page_desc_pages (sd, page_size)) * sd->count; |
---|
768 | } |
---|
769 | return count; |
---|
770 | } |
---|
771 | |
---|
772 | /** |
---|
773 | * Read a block of data from a segment. |
---|
774 | */ |
---|
775 | static int |
---|
776 | rtems_fdisk_seg_read (const rtems_flashdisk* fd, |
---|
777 | const rtems_fdisk_segment_ctl* sc, |
---|
778 | uint32_t offset, |
---|
779 | void* buffer, |
---|
780 | uint32_t size) |
---|
781 | { |
---|
782 | uint32_t device; |
---|
783 | uint32_t segment; |
---|
784 | const rtems_fdisk_segment_desc* sd; |
---|
785 | const rtems_fdisk_driver_handlers* ops; |
---|
786 | device = sc->device; |
---|
787 | segment = sc->segment; |
---|
788 | sd = rtems_fdisk_seg_descriptor (fd, device, segment); |
---|
789 | ops = fd->devices[device].descriptor->flash_ops; |
---|
790 | #if RTEMS_FDISK_TRACE |
---|
791 | rtems_fdisk_printf (fd, " seg-read: %02d-%03d: o=%08x s=%d", |
---|
792 | device, segment, offset, size); |
---|
793 | #endif |
---|
794 | return ops->read (sd, device, segment, offset, buffer, size); |
---|
795 | } |
---|
796 | |
---|
797 | /** |
---|
798 | * Write a block of data to a segment. It is assumed the |
---|
799 | * location in the segment is erased and able to take the |
---|
800 | * data. |
---|
801 | */ |
---|
802 | static int |
---|
803 | rtems_fdisk_seg_write (const rtems_flashdisk* fd, |
---|
804 | rtems_fdisk_segment_ctl* sc, |
---|
805 | uint32_t offset, |
---|
806 | const void* buffer, |
---|
807 | uint32_t size) |
---|
808 | { |
---|
809 | int ret; |
---|
810 | uint32_t device; |
---|
811 | uint32_t segment; |
---|
812 | const rtems_fdisk_segment_desc* sd; |
---|
813 | const rtems_fdisk_driver_handlers* ops; |
---|
814 | device = sc->device; |
---|
815 | segment = sc->segment; |
---|
816 | sd = rtems_fdisk_seg_descriptor (fd, device, segment); |
---|
817 | ops = fd->devices[device].descriptor->flash_ops; |
---|
818 | #if RTEMS_FDISK_TRACE |
---|
819 | rtems_fdisk_printf (fd, " seg-write: %02d-%03d: o=%08x s=%d", |
---|
820 | device, segment, offset, size); |
---|
821 | #endif |
---|
822 | ret = ops->write (sd, device, segment, offset, buffer, size); |
---|
823 | if (ret) |
---|
824 | sc->failed = true; |
---|
825 | |
---|
826 | return ret; |
---|
827 | } |
---|
828 | |
---|
829 | /** |
---|
830 | * Blank check the area of a segment. |
---|
831 | */ |
---|
832 | static int |
---|
833 | rtems_fdisk_seg_blank_check (const rtems_flashdisk* fd, |
---|
834 | rtems_fdisk_segment_ctl* sc, |
---|
835 | uint32_t offset, |
---|
836 | uint32_t size) |
---|
837 | { |
---|
838 | uint32_t device; |
---|
839 | uint32_t segment; |
---|
840 | const rtems_fdisk_segment_desc* sd; |
---|
841 | const rtems_fdisk_driver_handlers* ops; |
---|
842 | device = sc->device; |
---|
843 | segment = sc->segment; |
---|
844 | sd = rtems_fdisk_seg_descriptor (fd, device, segment); |
---|
845 | ops = fd->devices[device].descriptor->flash_ops; |
---|
846 | #if RTEMS_FDISK_TRACE |
---|
847 | rtems_fdisk_printf (fd, " seg-blank: %02d-%03d: o=%08x s=%d", |
---|
848 | device, segment, offset, size); |
---|
849 | #endif |
---|
850 | return ops->blank (sd, device, segment, offset, size); |
---|
851 | } |
---|
852 | /** |
---|
853 | * Verify the data with the data in a segment. |
---|
854 | */ |
---|
855 | static int |
---|
856 | rtems_fdisk_seg_verify (const rtems_flashdisk* fd, |
---|
857 | uint32_t device, |
---|
858 | uint32_t segment, |
---|
859 | uint32_t offset, |
---|
860 | const void* buffer, |
---|
861 | uint32_t size) |
---|
862 | { |
---|
863 | const rtems_fdisk_segment_desc* sd; |
---|
864 | const rtems_fdisk_driver_handlers* ops; |
---|
865 | sd = rtems_fdisk_seg_descriptor (fd, device, segment); |
---|
866 | ops = fd->devices[device].descriptor->flash_ops; |
---|
867 | #if RTEMS_FDISK_TRACE |
---|
868 | rtems_fdisk_printf (fd, " seg-verify: %02d-%03d: o=%08x s=%d", |
---|
869 | device, segment, offset, size); |
---|
870 | #endif |
---|
871 | return ops->verify (sd, device, segment, offset, buffer, size); |
---|
872 | } |
---|
873 | |
---|
874 | /** |
---|
875 | * Blank check a page of data in a segment. |
---|
876 | */ |
---|
877 | static int |
---|
878 | rtems_fdisk_seg_blank_check_page (const rtems_flashdisk* fd, |
---|
879 | rtems_fdisk_segment_ctl* sc, |
---|
880 | uint32_t page) |
---|
881 | { |
---|
882 | return rtems_fdisk_seg_blank_check (fd, sc, |
---|
883 | page * fd->block_size, fd->block_size); |
---|
884 | } |
---|
885 | |
---|
886 | /** |
---|
887 | * Read a page of data from a segment. |
---|
888 | */ |
---|
889 | static int |
---|
890 | rtems_fdisk_seg_read_page (const rtems_flashdisk* fd, |
---|
891 | rtems_fdisk_segment_ctl* sc, |
---|
892 | uint32_t page, |
---|
893 | void* buffer) |
---|
894 | { |
---|
895 | return rtems_fdisk_seg_read (fd, sc, |
---|
896 | page * fd->block_size, buffer, fd->block_size); |
---|
897 | } |
---|
898 | |
---|
899 | /** |
---|
900 | * Write a page of data to a segment. |
---|
901 | */ |
---|
902 | static int |
---|
903 | rtems_fdisk_seg_write_page (rtems_flashdisk* fd, |
---|
904 | rtems_fdisk_segment_ctl* sc, |
---|
905 | uint32_t page, |
---|
906 | const void* buffer) |
---|
907 | { |
---|
908 | if ((fd->flags & RTEMS_FDISK_BLANK_CHECK_BEFORE_WRITE)) |
---|
909 | { |
---|
910 | int ret = rtems_fdisk_seg_blank_check_page (fd, sc, page); |
---|
911 | if (ret) |
---|
912 | return ret; |
---|
913 | } |
---|
914 | --fd->erased_blocks; |
---|
915 | return rtems_fdisk_seg_write (fd, sc, |
---|
916 | page * fd->block_size, buffer, fd->block_size); |
---|
917 | } |
---|
918 | |
---|
919 | /** |
---|
920 | * Verify a page of data with the data in the segment. |
---|
921 | */ |
---|
922 | static int |
---|
923 | rtems_fdisk_seg_verify_page (const rtems_flashdisk* fd, |
---|
924 | uint32_t device, |
---|
925 | uint32_t segment, |
---|
926 | uint32_t page, |
---|
927 | const void* buffer) |
---|
928 | { |
---|
929 | return rtems_fdisk_seg_verify (fd, device, segment, |
---|
930 | page * fd->block_size, buffer, fd->block_size); |
---|
931 | } |
---|
932 | |
---|
933 | /** |
---|
934 | * Copy a page of data from one segment to another segment. |
---|
935 | */ |
---|
936 | static int |
---|
937 | rtems_fdisk_seg_copy_page (rtems_flashdisk* fd, |
---|
938 | rtems_fdisk_segment_ctl* src_sc, |
---|
939 | uint32_t src_page, |
---|
940 | rtems_fdisk_segment_ctl* dst_sc, |
---|
941 | uint32_t dst_page) |
---|
942 | { |
---|
943 | int ret; |
---|
944 | #if RTEMS_FDISK_TRACE |
---|
945 | rtems_fdisk_printf (fd, " seg-copy-page: %02d-%03d~%03d=>%02d-%03d~%03d", |
---|
946 | src_sc->device, src_sc->segment, src_page, |
---|
947 | dst_sc->device, dst_sc->segment, dst_page); |
---|
948 | #endif |
---|
949 | ret = rtems_fdisk_seg_read_page (fd, src_sc, src_page, |
---|
950 | fd->copy_buffer); |
---|
951 | if (ret) |
---|
952 | return ret; |
---|
953 | return rtems_fdisk_seg_write_page (fd, dst_sc, dst_page, |
---|
954 | fd->copy_buffer); |
---|
955 | } |
---|
956 | |
---|
957 | /** |
---|
958 | * Write the page descriptor to a segment. This code assumes the page |
---|
959 | * descriptors are located at offset 0 in the segment. |
---|
960 | */ |
---|
961 | static int |
---|
962 | rtems_fdisk_seg_write_page_desc (const rtems_flashdisk* fd, |
---|
963 | rtems_fdisk_segment_ctl* sc, |
---|
964 | uint32_t page, |
---|
965 | const rtems_fdisk_page_desc* page_desc) |
---|
966 | { |
---|
967 | uint32_t offset = page * sizeof (rtems_fdisk_page_desc); |
---|
968 | if ((fd->flags & RTEMS_FDISK_BLANK_CHECK_BEFORE_WRITE)) |
---|
969 | { |
---|
970 | int ret = rtems_fdisk_seg_blank_check (fd, sc, |
---|
971 | offset, |
---|
972 | sizeof (rtems_fdisk_page_desc)); |
---|
973 | if (ret) |
---|
974 | return ret; |
---|
975 | } |
---|
976 | return rtems_fdisk_seg_write (fd, sc, offset, |
---|
977 | page_desc, sizeof (rtems_fdisk_page_desc)); |
---|
978 | } |
---|
979 | |
---|
980 | /** |
---|
981 | * Write the page descriptor flags to a segment. This code assumes the page |
---|
982 | * descriptors are located at offset 0 in the segment. |
---|
983 | */ |
---|
984 | static int |
---|
985 | rtems_fdisk_seg_write_page_desc_flags (const rtems_flashdisk* fd, |
---|
986 | rtems_fdisk_segment_ctl* sc, |
---|
987 | uint32_t page, |
---|
988 | const rtems_fdisk_page_desc* page_desc) |
---|
989 | { |
---|
990 | uint32_t offset = ((page * sizeof (rtems_fdisk_page_desc)) + |
---|
991 | ((uint8_t*) &page_desc->flags) - ((uint8_t*) page_desc)); |
---|
992 | if ((fd->flags & RTEMS_FDISK_BLANK_CHECK_BEFORE_WRITE)) |
---|
993 | { |
---|
994 | uint16_t flash_flags; |
---|
995 | int ret; |
---|
996 | ret = rtems_fdisk_seg_read (fd, sc, offset, |
---|
997 | &flash_flags, sizeof (flash_flags)); |
---|
998 | if (ret) |
---|
999 | return ret; |
---|
1000 | if ((flash_flags & page_desc->flags) != page_desc->flags) |
---|
1001 | { |
---|
1002 | rtems_fdisk_error (" seg-write-page-flags: %02d-%03d-%03d: " |
---|
1003 | "flags not erased: 0x%04 -> 0x%04x", |
---|
1004 | sc->device, sc->segment, page, |
---|
1005 | flash_flags, page_desc->flags); |
---|
1006 | return ret; |
---|
1007 | } |
---|
1008 | } |
---|
1009 | return rtems_fdisk_seg_write (fd, sc, offset, |
---|
1010 | &page_desc->flags, sizeof (page_desc->flags)); |
---|
1011 | } |
---|
1012 | |
---|
1013 | /** |
---|
1014 | * Erase a device. |
---|
1015 | */ |
---|
1016 | static int |
---|
1017 | rtems_fdisk_device_erase (const rtems_flashdisk* fd, uint32_t device) |
---|
1018 | { |
---|
1019 | const rtems_fdisk_driver_handlers* ops; |
---|
1020 | ops = fd->devices[device].descriptor->flash_ops; |
---|
1021 | #if RTEMS_FDISK_TRACE |
---|
1022 | rtems_fdisk_printf (fd, " device-erase: %02d", device); |
---|
1023 | #endif |
---|
1024 | return ops->erase_device (fd->devices[device].descriptor, device); |
---|
1025 | } |
---|
1026 | |
---|
1027 | /** |
---|
1028 | * Erase all flash. |
---|
1029 | */ |
---|
1030 | static int |
---|
1031 | rtems_fdisk_erase_flash (const rtems_flashdisk* fd) |
---|
1032 | { |
---|
1033 | uint32_t device; |
---|
1034 | for (device = 0; device < fd->device_count; device++) |
---|
1035 | { |
---|
1036 | int ret; |
---|
1037 | |
---|
1038 | #if RTEMS_FDISK_TRACE |
---|
1039 | rtems_fdisk_info (fd, " erase-flash:%02d", device); |
---|
1040 | #endif |
---|
1041 | |
---|
1042 | ret = rtems_fdisk_device_erase (fd, device); |
---|
1043 | |
---|
1044 | if (ret != 0) |
---|
1045 | return ret; |
---|
1046 | } |
---|
1047 | return 0; |
---|
1048 | } |
---|
1049 | |
---|
1050 | /** |
---|
1051 | * Calculate the checksum of a page in a segment. |
---|
1052 | */ |
---|
1053 | static uint16_t |
---|
1054 | rtems_fdisk_page_checksum (const uint8_t* buffer, uint32_t page_size) |
---|
1055 | { |
---|
1056 | uint16_t cs = 0xffff; |
---|
1057 | uint32_t i; |
---|
1058 | |
---|
1059 | for (i = 0; i < page_size; i++, buffer++) |
---|
1060 | cs = rtems_fdisk_calc_crc16 (cs, *buffer); |
---|
1061 | |
---|
1062 | return cs; |
---|
1063 | } |
---|
1064 | |
---|
1065 | /** |
---|
1066 | * Erase the segment. |
---|
1067 | */ |
---|
1068 | static int |
---|
1069 | rtems_fdisk_erase_segment (rtems_flashdisk* fd, rtems_fdisk_segment_ctl* sc) |
---|
1070 | { |
---|
1071 | int ret; |
---|
1072 | uint32_t device; |
---|
1073 | uint32_t segment; |
---|
1074 | const rtems_fdisk_segment_desc* sd; |
---|
1075 | const rtems_fdisk_driver_handlers* ops; |
---|
1076 | device = sc->device; |
---|
1077 | segment = sc->segment; |
---|
1078 | sd = rtems_fdisk_seg_descriptor (fd, device, segment); |
---|
1079 | ops = fd->devices[device].descriptor->flash_ops; |
---|
1080 | ret = ops->erase (sd, device, segment); |
---|
1081 | if (ret) |
---|
1082 | { |
---|
1083 | rtems_fdisk_error (" erase-segment:%02d-%03d: " \ |
---|
1084 | "segment erase failed: %s (%d)", |
---|
1085 | sc->device, sc->segment, strerror (ret), ret); |
---|
1086 | sc->failed = true; |
---|
1087 | if (!rtems_fdisk_segment_queue_present (&fd->failed, sc)) |
---|
1088 | rtems_fdisk_segment_queue_push_tail (&fd->failed, sc); |
---|
1089 | return ret; |
---|
1090 | } |
---|
1091 | |
---|
1092 | fd->erased_blocks += sc->pages; |
---|
1093 | sc->erased++; |
---|
1094 | |
---|
1095 | memset (sc->page_descriptors, 0xff, sc->pages_desc * fd->block_size); |
---|
1096 | |
---|
1097 | sc->pages_active = 0; |
---|
1098 | sc->pages_used = 0; |
---|
1099 | sc->pages_bad = 0; |
---|
1100 | |
---|
1101 | sc->failed = false; |
---|
1102 | |
---|
1103 | /* |
---|
1104 | * Push to the tail of the available queue. It is a very |
---|
1105 | * simple type of wear reduction. Every other available |
---|
1106 | * segment will now get a go. |
---|
1107 | */ |
---|
1108 | rtems_fdisk_segment_queue_push_tail (&fd->available, sc); |
---|
1109 | |
---|
1110 | return 0; |
---|
1111 | } |
---|
1112 | |
---|
1113 | /** |
---|
1114 | * Erase used segment. |
---|
1115 | */ |
---|
1116 | static int |
---|
1117 | rtems_fdisk_erase_used (rtems_flashdisk* fd) |
---|
1118 | { |
---|
1119 | rtems_fdisk_segment_ctl* sc; |
---|
1120 | int latched_ret = 0; |
---|
1121 | |
---|
1122 | while ((sc = rtems_fdisk_segment_queue_pop_head (&fd->erase))) |
---|
1123 | { |
---|
1124 | /* |
---|
1125 | * The segment will either end up on the available queue or |
---|
1126 | * the failed queue. |
---|
1127 | */ |
---|
1128 | int ret = rtems_fdisk_erase_segment (fd, sc); |
---|
1129 | if (ret && !latched_ret) |
---|
1130 | latched_ret = ret; |
---|
1131 | } |
---|
1132 | |
---|
1133 | return latched_ret; |
---|
1134 | } |
---|
1135 | |
---|
1136 | /** |
---|
1137 | * Queue a segment. This is done after some of the stats for the segment |
---|
1138 | * have been changed and this may effect the order the segment pages have in |
---|
1139 | * the queue of available pages. |
---|
1140 | * |
---|
1141 | * @param fd The flash disk control table. |
---|
1142 | * @param sc The segment control table to be reallocated |
---|
1143 | */ |
---|
1144 | static void |
---|
1145 | rtems_fdisk_queue_segment (rtems_flashdisk* fd, rtems_fdisk_segment_ctl* sc) |
---|
1146 | { |
---|
1147 | #if RTEMS_FDISK_TRACE |
---|
1148 | rtems_fdisk_info (fd, " queue-seg:%02d-%03d: p=%d a=%d u=%d b=%d f=%s n=%s", |
---|
1149 | sc->device, sc->segment, |
---|
1150 | sc->pages, sc->pages_active, sc->pages_used, sc->pages_bad, |
---|
1151 | sc->failed ? "FAILED" : "no", sc->next ? "set" : "null"); |
---|
1152 | #endif |
---|
1153 | |
---|
1154 | /* |
---|
1155 | * If the segment has failed then check the failed queue and append |
---|
1156 | * if not failed. |
---|
1157 | */ |
---|
1158 | if (sc->failed) |
---|
1159 | { |
---|
1160 | if (!rtems_fdisk_segment_queue_present (&fd->failed, sc)) |
---|
1161 | rtems_fdisk_segment_queue_push_tail (&fd->failed, sc); |
---|
1162 | return; |
---|
1163 | } |
---|
1164 | |
---|
1165 | /* |
---|
1166 | * Remove the queue from the available or used queue. |
---|
1167 | */ |
---|
1168 | rtems_fdisk_segment_queue_remove (&fd->available, sc); |
---|
1169 | rtems_fdisk_segment_queue_remove (&fd->used, sc); |
---|
1170 | |
---|
1171 | /* |
---|
1172 | * Are all the pages in the segment used ? |
---|
1173 | * If they are and the driver has been configured to background |
---|
1174 | * erase place the segment on the used queue. If not configured |
---|
1175 | * to background erase perform the erase now. |
---|
1176 | * |
---|
1177 | */ |
---|
1178 | if (rtems_fdisk_seg_pages_available (sc) == 0) |
---|
1179 | { |
---|
1180 | if (sc->pages_active) |
---|
1181 | { |
---|
1182 | /* |
---|
1183 | * Keep the used queue sorted by the most number of used |
---|
1184 | * pages. When we compact we want to move the pages into |
---|
1185 | * a new segment and cover more than one segment. |
---|
1186 | */ |
---|
1187 | rtems_fdisk_segment_ctl* seg = fd->used.head; |
---|
1188 | |
---|
1189 | while (seg) |
---|
1190 | { |
---|
1191 | if (sc->pages_used > seg->pages_used) |
---|
1192 | break; |
---|
1193 | seg = seg->next; |
---|
1194 | } |
---|
1195 | |
---|
1196 | if (seg) |
---|
1197 | rtems_fdisk_segment_queue_insert_before (&fd->used, seg, sc); |
---|
1198 | else |
---|
1199 | rtems_fdisk_segment_queue_push_tail (&fd->used, sc); |
---|
1200 | } |
---|
1201 | else |
---|
1202 | { |
---|
1203 | if ((fd->flags & RTEMS_FDISK_BACKGROUND_ERASE)) |
---|
1204 | rtems_fdisk_segment_queue_push_tail (&fd->erase, sc); |
---|
1205 | else |
---|
1206 | rtems_fdisk_erase_segment (fd, sc); |
---|
1207 | } |
---|
1208 | } |
---|
1209 | else |
---|
1210 | { |
---|
1211 | /* |
---|
1212 | * The segment has pages available so place back onto the |
---|
1213 | * available list. The list is sorted from the least number |
---|
1214 | * of available pages to the most. This approach means |
---|
1215 | * the pages of a partially filled segment will be filled |
---|
1216 | * before moving onto another emptier segment. This keeps |
---|
1217 | * empty segments longer aiding compaction. |
---|
1218 | * |
---|
1219 | * The down side is the wear effect as a single segment |
---|
1220 | * could be used more than segment. This will not be |
---|
1221 | * addressed until wear support is added. |
---|
1222 | * |
---|
1223 | * @note Wear support can be added by having counts for |
---|
1224 | * for the number of times a segment is erased. This |
---|
1225 | * available list is then sorted on the least number |
---|
1226 | * of available pages then empty segments are sorted |
---|
1227 | * on the least number of erases the segment has. |
---|
1228 | * |
---|
1229 | * The erase count can be stored in specially flaged |
---|
1230 | * pages and contain a counter (32bits?) and 32 bits |
---|
1231 | * for each segment. When a segment is erased a |
---|
1232 | * bit is cleared for that segment. When 32 erasers |
---|
1233 | * has occurred the page is re-written to the flash |
---|
1234 | * with all the counters updated with the number of |
---|
1235 | * bits cleared and all bits set back to 1. |
---|
1236 | */ |
---|
1237 | rtems_fdisk_segment_ctl* seg = fd->available.head; |
---|
1238 | |
---|
1239 | while (seg) |
---|
1240 | { |
---|
1241 | if (rtems_fdisk_seg_pages_available (sc) < |
---|
1242 | rtems_fdisk_seg_pages_available (seg)) |
---|
1243 | break; |
---|
1244 | seg = seg->next; |
---|
1245 | } |
---|
1246 | |
---|
1247 | if (seg) |
---|
1248 | rtems_fdisk_segment_queue_insert_before (&fd->available, seg, sc); |
---|
1249 | else |
---|
1250 | rtems_fdisk_segment_queue_push_tail (&fd->available, sc); |
---|
1251 | } |
---|
1252 | } |
---|
1253 | |
---|
1254 | static int |
---|
1255 | rtems_fdisk_recycle_segment (rtems_flashdisk* fd, |
---|
1256 | rtems_fdisk_segment_ctl* ssc, |
---|
1257 | rtems_fdisk_segment_ctl* dsc, |
---|
1258 | uint32_t *pages) |
---|
1259 | { |
---|
1260 | int ret; |
---|
1261 | uint32_t spage; |
---|
1262 | uint32_t used = 0; |
---|
1263 | uint32_t active = 0; |
---|
1264 | |
---|
1265 | for (spage = 0; spage < ssc->pages; spage++) |
---|
1266 | { |
---|
1267 | rtems_fdisk_page_desc* spd = &ssc->page_descriptors[spage]; |
---|
1268 | |
---|
1269 | if (!dsc && ssc->pages_active > 0) |
---|
1270 | { |
---|
1271 | rtems_fdisk_error ("recycle: no available dst segment"); |
---|
1272 | return EIO; |
---|
1273 | } |
---|
1274 | |
---|
1275 | if (rtems_fdisk_page_desc_flags_set (spd, RTEMS_FDISK_PAGE_ACTIVE) && |
---|
1276 | !rtems_fdisk_page_desc_flags_set (spd, RTEMS_FDISK_PAGE_USED)) |
---|
1277 | { |
---|
1278 | uint32_t dst_pages; |
---|
1279 | rtems_fdisk_page_desc* dpd; |
---|
1280 | uint32_t dpage; |
---|
1281 | |
---|
1282 | dpage = rtems_fdisk_seg_next_available_page (dsc); |
---|
1283 | dpd = &dsc->page_descriptors[dpage]; |
---|
1284 | |
---|
1285 | active++; |
---|
1286 | |
---|
1287 | if (dpage >= dsc->pages) |
---|
1288 | { |
---|
1289 | rtems_fdisk_error ("recycle: %02d-%03d: " \ |
---|
1290 | "no page desc available: %d", |
---|
1291 | dsc->device, dsc->segment, |
---|
1292 | rtems_fdisk_seg_pages_available (dsc)); |
---|
1293 | dsc->failed = true; |
---|
1294 | rtems_fdisk_queue_segment (fd, dsc); |
---|
1295 | rtems_fdisk_segment_queue_push_head (&fd->used, ssc); |
---|
1296 | return EIO; |
---|
1297 | } |
---|
1298 | |
---|
1299 | #if RTEMS_FDISK_TRACE |
---|
1300 | rtems_fdisk_info (fd, "recycle: %02d-%03d-%03d=>%02d-%03d-%03d", |
---|
1301 | ssc->device, ssc->segment, spage, |
---|
1302 | dsc->device, dsc->segment, dpage); |
---|
1303 | #endif |
---|
1304 | ret = rtems_fdisk_seg_copy_page (fd, ssc, |
---|
1305 | spage + ssc->pages_desc, |
---|
1306 | dsc, |
---|
1307 | dpage + dsc->pages_desc); |
---|
1308 | if (ret) |
---|
1309 | { |
---|
1310 | rtems_fdisk_error ("recycle: %02d-%03d-%03d=>" \ |
---|
1311 | "%02d-%03d-%03d: " \ |
---|
1312 | "copy page failed: %s (%d)", |
---|
1313 | ssc->device, ssc->segment, spage, |
---|
1314 | dsc->device, dsc->segment, dpage, |
---|
1315 | strerror (ret), ret); |
---|
1316 | rtems_fdisk_queue_segment (fd, dsc); |
---|
1317 | rtems_fdisk_segment_queue_push_head (&fd->used, ssc); |
---|
1318 | return ret; |
---|
1319 | } |
---|
1320 | |
---|
1321 | *dpd = *spd; |
---|
1322 | |
---|
1323 | ret = rtems_fdisk_seg_write_page_desc (fd, |
---|
1324 | dsc, |
---|
1325 | dpage, dpd); |
---|
1326 | |
---|
1327 | if (ret) |
---|
1328 | { |
---|
1329 | rtems_fdisk_error ("recycle: %02d-%03d-%03d=>" \ |
---|
1330 | "%02d-%03d-%03d: copy pd failed: %s (%d)", |
---|
1331 | ssc->device, ssc->segment, spage, |
---|
1332 | dsc->device, dsc->segment, dpage, |
---|
1333 | strerror (ret), ret); |
---|
1334 | rtems_fdisk_queue_segment (fd, dsc); |
---|
1335 | rtems_fdisk_segment_queue_push_head (&fd->used, ssc); |
---|
1336 | return ret; |
---|
1337 | } |
---|
1338 | |
---|
1339 | dsc->pages_active++; |
---|
1340 | |
---|
1341 | /* |
---|
1342 | * No need to set the used bit on the source page as the |
---|
1343 | * segment will be erased. Power down could be a problem. |
---|
1344 | * We do the stats to make sure everything is as it should |
---|
1345 | * be. |
---|
1346 | */ |
---|
1347 | |
---|
1348 | ssc->pages_active--; |
---|
1349 | ssc->pages_used++; |
---|
1350 | |
---|
1351 | fd->blocks[spd->block].segment = dsc; |
---|
1352 | fd->blocks[spd->block].page = dpage; |
---|
1353 | |
---|
1354 | /* |
---|
1355 | * Place the segment on to the correct queue. |
---|
1356 | */ |
---|
1357 | rtems_fdisk_queue_segment (fd, dsc); |
---|
1358 | |
---|
1359 | /* |
---|
1360 | * Get new destination segment if necessary. |
---|
1361 | */ |
---|
1362 | dst_pages = rtems_fdisk_seg_pages_available (dsc); |
---|
1363 | if (dst_pages == 0) |
---|
1364 | dsc = rtems_fdisk_seg_most_available (&fd->available); |
---|
1365 | |
---|
1366 | (*pages)--; |
---|
1367 | } |
---|
1368 | else if (rtems_fdisk_page_desc_erased (spd)) |
---|
1369 | { |
---|
1370 | --fd->erased_blocks; |
---|
1371 | } |
---|
1372 | else |
---|
1373 | { |
---|
1374 | used++; |
---|
1375 | } |
---|
1376 | } |
---|
1377 | |
---|
1378 | #if RTEMS_FDISK_TRACE |
---|
1379 | rtems_fdisk_printf (fd, "ssc end: %d-%d: p=%ld, a=%ld, u=%ld", |
---|
1380 | ssc->device, ssc->segment, |
---|
1381 | pages, active, used); |
---|
1382 | #endif |
---|
1383 | if (ssc->pages_active != 0) |
---|
1384 | { |
---|
1385 | rtems_fdisk_error ("compacting: ssc pages not 0: %d", |
---|
1386 | ssc->pages_active); |
---|
1387 | } |
---|
1388 | |
---|
1389 | ret = rtems_fdisk_erase_segment (fd, ssc); |
---|
1390 | |
---|
1391 | return ret; |
---|
1392 | } |
---|
1393 | |
---|
1394 | /** |
---|
1395 | * Compact the used segments to free what is available. Find the segment |
---|
1396 | * with the most available number of pages and see if we have |
---|
1397 | * used segments that will fit. The used queue is sorted on the least |
---|
1398 | * number of active pages. |
---|
1399 | */ |
---|
1400 | static int |
---|
1401 | rtems_fdisk_compact (rtems_flashdisk* fd) |
---|
1402 | { |
---|
1403 | int ret; |
---|
1404 | rtems_fdisk_segment_ctl* dsc; |
---|
1405 | rtems_fdisk_segment_ctl* ssc; |
---|
1406 | uint32_t compacted_segs = 0; |
---|
1407 | uint32_t pages; |
---|
1408 | |
---|
1409 | if (rtems_fdisk_is_erased_blocks_starvation (fd)) |
---|
1410 | { |
---|
1411 | #if RTEMS_FDISK_TRACE |
---|
1412 | rtems_fdisk_printf (fd, " resolve starvation"); |
---|
1413 | #endif |
---|
1414 | |
---|
1415 | ssc = rtems_fdisk_segment_queue_pop_head (&fd->used); |
---|
1416 | if (!ssc) |
---|
1417 | ssc = rtems_fdisk_segment_queue_pop_head (&fd->available); |
---|
1418 | |
---|
1419 | if (ssc) |
---|
1420 | { |
---|
1421 | dsc = rtems_fdisk_seg_most_available (&fd->available); |
---|
1422 | if (dsc) |
---|
1423 | { |
---|
1424 | ret = rtems_fdisk_recycle_segment (fd, ssc, dsc, &pages); |
---|
1425 | if (ret) |
---|
1426 | return ret; |
---|
1427 | } |
---|
1428 | else |
---|
1429 | { |
---|
1430 | rtems_fdisk_error ("compacting: starvation"); |
---|
1431 | return EIO; |
---|
1432 | } |
---|
1433 | } |
---|
1434 | else |
---|
1435 | { |
---|
1436 | rtems_fdisk_error ("compacting: nothing to recycle"); |
---|
1437 | return EIO; |
---|
1438 | } |
---|
1439 | } |
---|
1440 | |
---|
1441 | while (fd->used.head) |
---|
1442 | { |
---|
1443 | uint32_t dst_pages; |
---|
1444 | uint32_t segments; |
---|
1445 | |
---|
1446 | #if RTEMS_FDISK_TRACE |
---|
1447 | rtems_fdisk_printf (fd, " compacting"); |
---|
1448 | #endif |
---|
1449 | |
---|
1450 | dsc = rtems_fdisk_seg_most_available (&fd->available); |
---|
1451 | |
---|
1452 | if (dsc == 0) |
---|
1453 | { |
---|
1454 | rtems_fdisk_error ("compacting: no available segments to compact too"); |
---|
1455 | return EIO; |
---|
1456 | } |
---|
1457 | |
---|
1458 | ssc = fd->used.head; |
---|
1459 | dst_pages = rtems_fdisk_seg_pages_available (dsc); |
---|
1460 | segments = 0; |
---|
1461 | pages = 0; |
---|
1462 | |
---|
1463 | #if RTEMS_FDISK_TRACE |
---|
1464 | rtems_fdisk_printf (fd, " dsc:%02d-%03d: most available", |
---|
1465 | dsc->device, dsc->segment); |
---|
1466 | #endif |
---|
1467 | |
---|
1468 | /* |
---|
1469 | * Count the number of segments that have active pages that fit into |
---|
1470 | * the destination segment. Also limit the number of segments that |
---|
1471 | * we handle during one compaction. A lower number means less aggressive |
---|
1472 | * compaction or less delay when compacting but it may mean the disk |
---|
1473 | * will fill. |
---|
1474 | */ |
---|
1475 | |
---|
1476 | while (ssc && |
---|
1477 | ((pages + ssc->pages_active) < dst_pages) && |
---|
1478 | ((compacted_segs + segments) < fd->compact_segs)) |
---|
1479 | { |
---|
1480 | pages += ssc->pages_active; |
---|
1481 | segments++; |
---|
1482 | ssc = ssc->next; |
---|
1483 | } |
---|
1484 | |
---|
1485 | /* |
---|
1486 | * We need a source segment and have pages to copy and |
---|
1487 | * compacting one segment to another is silly. Compaction needs |
---|
1488 | * to free at least one more segment. |
---|
1489 | */ |
---|
1490 | |
---|
1491 | if (!ssc || (pages == 0) || ((compacted_segs + segments) == 1)) |
---|
1492 | { |
---|
1493 | #if RTEMS_FDISK_TRACE |
---|
1494 | rtems_fdisk_printf (fd, " nothing to compact"); |
---|
1495 | #endif |
---|
1496 | break; |
---|
1497 | } |
---|
1498 | |
---|
1499 | #if RTEMS_FDISK_TRACE |
---|
1500 | rtems_fdisk_printf (fd, " ssc scan: %d-%d: p=%ld, seg=%ld", |
---|
1501 | ssc->device, ssc->segment, |
---|
1502 | pages, segments); |
---|
1503 | #endif |
---|
1504 | |
---|
1505 | rtems_fdisk_segment_queue_remove (&fd->available, dsc); |
---|
1506 | |
---|
1507 | /* |
---|
1508 | * We now copy the pages to the new segment. |
---|
1509 | */ |
---|
1510 | |
---|
1511 | while (pages) |
---|
1512 | { |
---|
1513 | ssc = rtems_fdisk_segment_queue_pop_head (&fd->used); |
---|
1514 | |
---|
1515 | if (ssc) |
---|
1516 | { |
---|
1517 | ret = rtems_fdisk_recycle_segment (fd, ssc, dsc, &pages); |
---|
1518 | if (ret) |
---|
1519 | return ret; |
---|
1520 | } |
---|
1521 | } |
---|
1522 | |
---|
1523 | compacted_segs += segments; |
---|
1524 | } |
---|
1525 | |
---|
1526 | return 0; |
---|
1527 | } |
---|
1528 | |
---|
1529 | /** |
---|
1530 | * Recover the block mappings from the devices. |
---|
1531 | */ |
---|
1532 | static int |
---|
1533 | rtems_fdisk_recover_block_mappings (rtems_flashdisk* fd) |
---|
1534 | { |
---|
1535 | uint32_t device; |
---|
1536 | |
---|
1537 | /* |
---|
1538 | * Clear the queues. |
---|
1539 | */ |
---|
1540 | rtems_fdisk_segment_queue_init (&fd->available); |
---|
1541 | rtems_fdisk_segment_queue_init (&fd->used); |
---|
1542 | rtems_fdisk_segment_queue_init (&fd->erase); |
---|
1543 | rtems_fdisk_segment_queue_init (&fd->failed); |
---|
1544 | |
---|
1545 | /* |
---|
1546 | * Clear the lock mappings. |
---|
1547 | */ |
---|
1548 | memset (fd->blocks, 0, fd->block_count * sizeof (rtems_fdisk_block_ctl)); |
---|
1549 | |
---|
1550 | /* |
---|
1551 | * Scan each segment or each device recovering the valid pages. |
---|
1552 | */ |
---|
1553 | fd->erased_blocks = 0; |
---|
1554 | fd->starvation_threshold = 0; |
---|
1555 | for (device = 0; device < fd->device_count; device++) |
---|
1556 | { |
---|
1557 | uint32_t segment; |
---|
1558 | for (segment = 0; segment < fd->devices[device].segment_count; segment++) |
---|
1559 | { |
---|
1560 | rtems_fdisk_segment_ctl* sc = &fd->devices[device].segments[segment]; |
---|
1561 | const rtems_fdisk_segment_desc* sd = sc->descriptor; |
---|
1562 | rtems_fdisk_page_desc* pd; |
---|
1563 | uint32_t page; |
---|
1564 | int ret; |
---|
1565 | |
---|
1566 | #if RTEMS_FDISK_TRACE |
---|
1567 | rtems_fdisk_info (fd, "recover-block-mappings:%02d-%03d", device, segment); |
---|
1568 | #endif |
---|
1569 | |
---|
1570 | sc->pages_desc = rtems_fdisk_page_desc_pages (sd, fd->block_size); |
---|
1571 | sc->pages = |
---|
1572 | rtems_fdisk_pages_in_segment (sd, fd->block_size) - sc->pages_desc; |
---|
1573 | if (sc->pages > fd->starvation_threshold) |
---|
1574 | fd->starvation_threshold = sc->pages; |
---|
1575 | |
---|
1576 | sc->pages_active = 0; |
---|
1577 | sc->pages_used = 0; |
---|
1578 | sc->pages_bad = 0; |
---|
1579 | |
---|
1580 | sc->failed = false; |
---|
1581 | |
---|
1582 | if (!sc->page_descriptors) |
---|
1583 | sc->page_descriptors = malloc (sc->pages_desc * fd->block_size); |
---|
1584 | |
---|
1585 | if (!sc->page_descriptors) |
---|
1586 | rtems_fdisk_abort ("no memory for page descriptors"); |
---|
1587 | |
---|
1588 | pd = sc->page_descriptors; |
---|
1589 | |
---|
1590 | /* |
---|
1591 | * The page descriptors are always at the start of the segment. Read |
---|
1592 | * the descriptors off the device into the segment control page |
---|
1593 | * descriptors. |
---|
1594 | * |
---|
1595 | * @todo It may be better to ask the driver to get these value |
---|
1596 | * so NAND flash could be better supported. |
---|
1597 | */ |
---|
1598 | ret = rtems_fdisk_seg_read (fd, sc, 0, (void*) pd, |
---|
1599 | sc->pages_desc * fd->block_size); |
---|
1600 | |
---|
1601 | if (ret) |
---|
1602 | { |
---|
1603 | rtems_fdisk_error ("recover-block-mappings:%02d-%03d: " \ |
---|
1604 | "read page desc failed: %s (%d)", |
---|
1605 | device, segment, strerror (ret), ret); |
---|
1606 | return ret; |
---|
1607 | } |
---|
1608 | |
---|
1609 | /* |
---|
1610 | * Check each page in the segement for valid pages. |
---|
1611 | * Update the stats for the segment so we know how many pages |
---|
1612 | * are active and how many are used. |
---|
1613 | * |
---|
1614 | * If the page is active see if the block is with-in range and |
---|
1615 | * if the block is a duplicate. |
---|
1616 | */ |
---|
1617 | for (page = 0; page < sc->pages; page++, pd++) |
---|
1618 | { |
---|
1619 | if (rtems_fdisk_page_desc_erased (pd)) |
---|
1620 | { |
---|
1621 | /* |
---|
1622 | * Is the page erased ? |
---|
1623 | */ |
---|
1624 | ret = rtems_fdisk_seg_blank_check_page (fd, sc, |
---|
1625 | page + sc->pages_desc); |
---|
1626 | |
---|
1627 | if (ret == 0) |
---|
1628 | { |
---|
1629 | ++fd->erased_blocks; |
---|
1630 | } |
---|
1631 | else |
---|
1632 | { |
---|
1633 | #if RTEMS_FDISK_TRACE |
---|
1634 | rtems_fdisk_warning (fd, "page not blank: %d-%d-%d", |
---|
1635 | device, segment, page, pd->block); |
---|
1636 | #endif |
---|
1637 | rtems_fdisk_page_desc_set_flags (pd, RTEMS_FDISK_PAGE_USED); |
---|
1638 | |
---|
1639 | ret = rtems_fdisk_seg_write_page_desc (fd, sc, |
---|
1640 | page, pd); |
---|
1641 | |
---|
1642 | if (ret) |
---|
1643 | { |
---|
1644 | rtems_fdisk_error ("forcing page to used failed: %d-%d-%d", |
---|
1645 | device, segment, page); |
---|
1646 | } |
---|
1647 | |
---|
1648 | sc->pages_used++; |
---|
1649 | } |
---|
1650 | } |
---|
1651 | else |
---|
1652 | { |
---|
1653 | if (rtems_fdisk_page_desc_flags_set (pd, RTEMS_FDISK_PAGE_USED)) |
---|
1654 | { |
---|
1655 | sc->pages_used++; |
---|
1656 | } |
---|
1657 | else if (rtems_fdisk_page_desc_flags_set (pd, RTEMS_FDISK_PAGE_ACTIVE)) |
---|
1658 | { |
---|
1659 | if (pd->block >= fd->block_count) |
---|
1660 | { |
---|
1661 | #if RTEMS_FDISK_TRACE |
---|
1662 | rtems_fdisk_warning (fd, |
---|
1663 | "invalid block number: %d-%d-%d: block: %d", |
---|
1664 | device, segment, page, pd->block); |
---|
1665 | #endif |
---|
1666 | sc->pages_bad++; |
---|
1667 | } |
---|
1668 | else if (fd->blocks[pd->block].segment) |
---|
1669 | { |
---|
1670 | /** |
---|
1671 | * @todo |
---|
1672 | * This may need more work later. Maybe a counter is stored with |
---|
1673 | * each block so we can tell which is the later block when |
---|
1674 | * duplicates appear. A power down with a failed wirte could cause |
---|
1675 | * a duplicate. |
---|
1676 | */ |
---|
1677 | const rtems_fdisk_segment_ctl* bsc = fd->blocks[pd->block].segment; |
---|
1678 | rtems_fdisk_error ("duplicate block: %d-%d-%d: " \ |
---|
1679 | "duplicate: %d-%d-%d", |
---|
1680 | bsc->device, bsc->segment, |
---|
1681 | fd->blocks[pd->block].page, |
---|
1682 | device, segment, page); |
---|
1683 | sc->pages_bad++; |
---|
1684 | } |
---|
1685 | else |
---|
1686 | { |
---|
1687 | /** |
---|
1688 | * @todo |
---|
1689 | * Add start up crc checks here. |
---|
1690 | */ |
---|
1691 | fd->blocks[pd->block].segment = sc; |
---|
1692 | fd->blocks[pd->block].page = page; |
---|
1693 | |
---|
1694 | /* |
---|
1695 | * The page is active. |
---|
1696 | */ |
---|
1697 | sc->pages_active++; |
---|
1698 | } |
---|
1699 | } |
---|
1700 | else |
---|
1701 | sc->pages_bad++; |
---|
1702 | } |
---|
1703 | } |
---|
1704 | |
---|
1705 | /* |
---|
1706 | * Place the segment on to the correct queue. |
---|
1707 | */ |
---|
1708 | rtems_fdisk_queue_segment (fd, sc); |
---|
1709 | } |
---|
1710 | } |
---|
1711 | |
---|
1712 | return 0; |
---|
1713 | } |
---|
1714 | |
---|
1715 | /** |
---|
1716 | * Read a block. The block is checked to see if the page referenced |
---|
1717 | * is valid and the page has a valid crc. |
---|
1718 | * |
---|
1719 | * @param fd The rtems_flashdisk control table. |
---|
1720 | * @param block The block number to read. |
---|
1721 | * @param buffer The buffer to write the data into. |
---|
1722 | * @return 0 No error. |
---|
1723 | * @return EIO Invalid block size, block number, segment pointer, crc, |
---|
1724 | * page flags. |
---|
1725 | */ |
---|
1726 | static bool |
---|
1727 | rtems_fdisk_read_block (rtems_flashdisk* fd, |
---|
1728 | uint32_t block, |
---|
1729 | uint8_t* buffer) |
---|
1730 | { |
---|
1731 | rtems_fdisk_block_ctl* bc; |
---|
1732 | rtems_fdisk_segment_ctl* sc; |
---|
1733 | rtems_fdisk_page_desc* pd; |
---|
1734 | |
---|
1735 | #if RTEMS_FDISK_TRACE |
---|
1736 | rtems_fdisk_info (fd, "read-block:%d", block); |
---|
1737 | #endif |
---|
1738 | |
---|
1739 | /* |
---|
1740 | * Broken out to allow info messages when testing. |
---|
1741 | */ |
---|
1742 | |
---|
1743 | if (block >= (fd->block_count - fd->unavail_blocks)) |
---|
1744 | { |
---|
1745 | rtems_fdisk_error ("read-block: block out of range: %d", block); |
---|
1746 | return EIO; |
---|
1747 | } |
---|
1748 | |
---|
1749 | bc = &fd->blocks[block]; |
---|
1750 | |
---|
1751 | if (!bc->segment) |
---|
1752 | { |
---|
1753 | #if RTEMS_FDISK_TRACE |
---|
1754 | rtems_fdisk_info (fd, "read-block: no segment mapping: %d", block); |
---|
1755 | #endif |
---|
1756 | memset (buffer, 0xff, fd->block_size); |
---|
1757 | return 0; |
---|
1758 | } |
---|
1759 | |
---|
1760 | sc = fd->blocks[block].segment; |
---|
1761 | pd = &sc->page_descriptors[bc->page]; |
---|
1762 | |
---|
1763 | #if RTEMS_FDISK_TRACE |
---|
1764 | rtems_fdisk_info (fd, |
---|
1765 | " read:%d=>%02d-%03d-%03d: p=%d a=%d u=%d b=%d n=%s: " \ |
---|
1766 | "f=%04x c=%04x b=%d", |
---|
1767 | block, sc->device, sc->segment, bc->page, |
---|
1768 | sc->pages, sc->pages_active, sc->pages_used, sc->pages_bad, |
---|
1769 | sc->next ? "set" : "null", |
---|
1770 | pd->flags, pd->crc, pd->block); |
---|
1771 | #endif |
---|
1772 | |
---|
1773 | if (rtems_fdisk_page_desc_flags_set (pd, RTEMS_FDISK_PAGE_ACTIVE)) |
---|
1774 | { |
---|
1775 | if (rtems_fdisk_page_desc_flags_clear (pd, RTEMS_FDISK_PAGE_USED)) |
---|
1776 | { |
---|
1777 | uint16_t cs; |
---|
1778 | |
---|
1779 | /* |
---|
1780 | * We use the segment page offset not the page number used in the |
---|
1781 | * driver. This skips the page descriptors. |
---|
1782 | */ |
---|
1783 | int ret = rtems_fdisk_seg_read_page (fd, sc, |
---|
1784 | bc->page + sc->pages_desc, buffer); |
---|
1785 | |
---|
1786 | if (ret) |
---|
1787 | { |
---|
1788 | #if RTEMS_FDISK_TRACE |
---|
1789 | rtems_fdisk_info (fd, |
---|
1790 | "read-block:%02d-%03d-%03d: read page failed: %s (%d)", |
---|
1791 | sc->device, sc->segment, bc->page, |
---|
1792 | strerror (ret), ret); |
---|
1793 | #endif |
---|
1794 | return ret; |
---|
1795 | } |
---|
1796 | |
---|
1797 | cs = rtems_fdisk_page_checksum (buffer, fd->block_size); |
---|
1798 | |
---|
1799 | if (cs == pd->crc) |
---|
1800 | return 0; |
---|
1801 | |
---|
1802 | rtems_fdisk_error ("read-block: crc failure: %d: buffer:%04x page:%04x", |
---|
1803 | block, cs, pd->crc); |
---|
1804 | } |
---|
1805 | else |
---|
1806 | { |
---|
1807 | rtems_fdisk_error ("read-block: block points to used page: %d: %d-%d-%d", |
---|
1808 | block, sc->device, sc->segment, bc->page); |
---|
1809 | } |
---|
1810 | } |
---|
1811 | else |
---|
1812 | { |
---|
1813 | rtems_fdisk_error ("read-block: block page not active: %d: %d-%d-%d", |
---|
1814 | block, sc->device, sc->segment, bc->page); |
---|
1815 | } |
---|
1816 | |
---|
1817 | return EIO; |
---|
1818 | } |
---|
1819 | |
---|
1820 | /** |
---|
1821 | * Write a block. The block: |
---|
1822 | * |
---|
1823 | * # May never have existed in flash before this write. |
---|
1824 | * # Exists and needs to be moved to a new page. |
---|
1825 | * |
---|
1826 | * If the block does not exist in flash we need to get the next |
---|
1827 | * segment available to place the page into. The segments with |
---|
1828 | * available pages are held on the avaliable list sorted on least |
---|
1829 | * number of available pages as the primary key. Currently there |
---|
1830 | * is no secondary key. Empty segments are at the end of the list. |
---|
1831 | * |
---|
1832 | * If the block already exists we need to set the USED bit in the |
---|
1833 | * current page's flags. This is a single byte which changes a 1 to |
---|
1834 | * a 0 and can be done with a single 16 bit write. The driver for |
---|
1835 | * 8 bit devices should only attempt the write on the changed bit. |
---|
1836 | * |
---|
1837 | * @param fd The rtems_flashdisk control table. |
---|
1838 | * @param block The block number to read. |
---|
1839 | * @param block_size The size of the block. Must match what we have. |
---|
1840 | * @param buffer The buffer to write the data into. |
---|
1841 | * @return 0 No error. |
---|
1842 | * @return EIO Invalid block size, block number, segment pointer, crc, |
---|
1843 | * page flags. |
---|
1844 | */ |
---|
1845 | static int |
---|
1846 | rtems_fdisk_write_block (rtems_flashdisk* fd, |
---|
1847 | uint32_t block, |
---|
1848 | const uint8_t* buffer) |
---|
1849 | { |
---|
1850 | rtems_fdisk_block_ctl* bc; |
---|
1851 | rtems_fdisk_segment_ctl* sc; |
---|
1852 | rtems_fdisk_page_desc* pd; |
---|
1853 | uint32_t page; |
---|
1854 | int ret; |
---|
1855 | |
---|
1856 | #if RTEMS_FDISK_TRACE |
---|
1857 | rtems_fdisk_info (fd, "write-block:%d", block); |
---|
1858 | #endif |
---|
1859 | |
---|
1860 | /* |
---|
1861 | * Broken out to allow info messages when testing. |
---|
1862 | */ |
---|
1863 | |
---|
1864 | if (block >= (fd->block_count - fd->unavail_blocks)) |
---|
1865 | { |
---|
1866 | rtems_fdisk_error ("write-block: block out of range: %d", block); |
---|
1867 | return EIO; |
---|
1868 | } |
---|
1869 | |
---|
1870 | bc = &fd->blocks[block]; |
---|
1871 | |
---|
1872 | /* |
---|
1873 | * Does the page exist in flash ? |
---|
1874 | */ |
---|
1875 | if (bc->segment) |
---|
1876 | { |
---|
1877 | sc = bc->segment; |
---|
1878 | pd = &sc->page_descriptors[bc->page]; |
---|
1879 | |
---|
1880 | #if RTEMS_FDISK_TRACE |
---|
1881 | rtems_fdisk_info (fd, " write:%02d-%03d-%03d: flag used", |
---|
1882 | sc->device, sc->segment, bc->page); |
---|
1883 | #endif |
---|
1884 | |
---|
1885 | /* |
---|
1886 | * The page exists in flash so see if the page has been changed. |
---|
1887 | */ |
---|
1888 | if (rtems_fdisk_seg_verify_page (fd, sc->device, sc->segment, |
---|
1889 | bc->page + sc->pages_desc, buffer) == 0) |
---|
1890 | { |
---|
1891 | #if RTEMS_FDISK_TRACE |
---|
1892 | rtems_fdisk_info (fd, "write-block:%d=>%02d-%03d-%03d: page verified", |
---|
1893 | block, sc->device, sc->segment, bc->page); |
---|
1894 | #endif |
---|
1895 | return 0; |
---|
1896 | } |
---|
1897 | |
---|
1898 | /* |
---|
1899 | * The page exists in flash so we need to set the used flag |
---|
1900 | * in the page descriptor. The descriptor is in memory with the |
---|
1901 | * segment control block. We can assume this memory copy |
---|
1902 | * matches the flash device. |
---|
1903 | */ |
---|
1904 | |
---|
1905 | rtems_fdisk_page_desc_set_flags (pd, RTEMS_FDISK_PAGE_USED); |
---|
1906 | |
---|
1907 | ret = rtems_fdisk_seg_write_page_desc_flags (fd, sc, bc->page, pd); |
---|
1908 | |
---|
1909 | if (ret) |
---|
1910 | { |
---|
1911 | #if RTEMS_FDISK_TRACE |
---|
1912 | rtems_fdisk_info (fd, " write:%02d-%03d-%03d: " \ |
---|
1913 | "write used page desc failed: %s (%d)", |
---|
1914 | sc->device, sc->segment, bc->page, |
---|
1915 | strerror (ret), ret); |
---|
1916 | #endif |
---|
1917 | } |
---|
1918 | else |
---|
1919 | { |
---|
1920 | sc->pages_active--; |
---|
1921 | sc->pages_used++; |
---|
1922 | } |
---|
1923 | |
---|
1924 | /* |
---|
1925 | * If possible reuse this segment. This will mean the segment |
---|
1926 | * needs to be removed from the available list and placed |
---|
1927 | * back if space is still available. |
---|
1928 | */ |
---|
1929 | rtems_fdisk_queue_segment (fd, sc); |
---|
1930 | |
---|
1931 | /* |
---|
1932 | * If no background compacting then compact in the forground. |
---|
1933 | * If we compact we ignore the error as there is little we |
---|
1934 | * can do from here. The write may will work. |
---|
1935 | */ |
---|
1936 | if ((fd->flags & RTEMS_FDISK_BACKGROUND_COMPACT) == 0) |
---|
1937 | rtems_fdisk_compact (fd); |
---|
1938 | } |
---|
1939 | |
---|
1940 | /* |
---|
1941 | * Is it time to compact the disk ? |
---|
1942 | * |
---|
1943 | * We override the background compaction configruation. |
---|
1944 | */ |
---|
1945 | if (rtems_fdisk_segment_count_queue (&fd->available) <= |
---|
1946 | fd->avail_compact_segs) |
---|
1947 | rtems_fdisk_compact (fd); |
---|
1948 | |
---|
1949 | /* |
---|
1950 | * Get the next avaliable segment. |
---|
1951 | */ |
---|
1952 | sc = rtems_fdisk_segment_queue_pop_head (&fd->available); |
---|
1953 | |
---|
1954 | /* |
---|
1955 | * Is the flash disk full ? |
---|
1956 | */ |
---|
1957 | if (!sc) |
---|
1958 | { |
---|
1959 | /* |
---|
1960 | * If compacting is configured for the background do it now |
---|
1961 | * to see if we can get some space back. |
---|
1962 | */ |
---|
1963 | if ((fd->flags & RTEMS_FDISK_BACKGROUND_COMPACT)) |
---|
1964 | rtems_fdisk_compact (fd); |
---|
1965 | |
---|
1966 | /* |
---|
1967 | * Try again for some free space. |
---|
1968 | */ |
---|
1969 | sc = rtems_fdisk_segment_queue_pop_head (&fd->available); |
---|
1970 | |
---|
1971 | if (!sc) |
---|
1972 | { |
---|
1973 | rtems_fdisk_error ("write-block: no available pages"); |
---|
1974 | return ENOSPC; |
---|
1975 | } |
---|
1976 | } |
---|
1977 | |
---|
1978 | #if RTEMS_FDISK_TRACE |
---|
1979 | if (fd->info_level >= 3) |
---|
1980 | { |
---|
1981 | char queues[5]; |
---|
1982 | rtems_fdisk_queue_status (fd, sc, queues); |
---|
1983 | rtems_fdisk_info (fd, " write:%d=>%02d-%03d: queue check: %s", |
---|
1984 | block, sc->device, sc->segment, queues); |
---|
1985 | } |
---|
1986 | #endif |
---|
1987 | |
---|
1988 | /* |
---|
1989 | * Find the next avaliable page in the segment. |
---|
1990 | */ |
---|
1991 | |
---|
1992 | pd = sc->page_descriptors; |
---|
1993 | |
---|
1994 | for (page = 0; page < sc->pages; page++, pd++) |
---|
1995 | { |
---|
1996 | if (rtems_fdisk_page_desc_erased (pd)) |
---|
1997 | { |
---|
1998 | pd->crc = rtems_fdisk_page_checksum (buffer, fd->block_size); |
---|
1999 | pd->block = block; |
---|
2000 | |
---|
2001 | bc->segment = sc; |
---|
2002 | bc->page = page; |
---|
2003 | |
---|
2004 | rtems_fdisk_page_desc_set_flags (pd, RTEMS_FDISK_PAGE_ACTIVE); |
---|
2005 | |
---|
2006 | #if RTEMS_FDISK_TRACE |
---|
2007 | rtems_fdisk_info (fd, " write:%d=>%02d-%03d-%03d: write: " \ |
---|
2008 | "p=%d a=%d u=%d b=%d n=%s: f=%04x c=%04x b=%d", |
---|
2009 | block, sc->device, sc->segment, page, |
---|
2010 | sc->pages, sc->pages_active, sc->pages_used, |
---|
2011 | sc->pages_bad, sc->next ? "set" : "null", |
---|
2012 | pd->flags, pd->crc, pd->block); |
---|
2013 | #endif |
---|
2014 | |
---|
2015 | /* |
---|
2016 | * We use the segment page offset not the page number used in the |
---|
2017 | * driver. This skips the page descriptors. |
---|
2018 | */ |
---|
2019 | ret = rtems_fdisk_seg_write_page (fd, sc, page + sc->pages_desc, buffer); |
---|
2020 | if (ret) |
---|
2021 | { |
---|
2022 | #if RTEMS_FDISK_TRACE |
---|
2023 | rtems_fdisk_info (fd, "write-block:%02d-%03d-%03d: write page failed: " \ |
---|
2024 | "%s (%d)", sc->device, sc->segment, page, |
---|
2025 | strerror (ret), ret); |
---|
2026 | #endif |
---|
2027 | } |
---|
2028 | else |
---|
2029 | { |
---|
2030 | ret = rtems_fdisk_seg_write_page_desc (fd, sc, page, pd); |
---|
2031 | if (ret) |
---|
2032 | { |
---|
2033 | #if RTEMS_FDISK_TRACE |
---|
2034 | rtems_fdisk_info (fd, "write-block:%02d-%03d-%03d: " \ |
---|
2035 | "write page desc failed: %s (%d)", |
---|
2036 | sc->device, sc->segment, bc->page, |
---|
2037 | strerror (ret), ret); |
---|
2038 | #endif |
---|
2039 | } |
---|
2040 | else |
---|
2041 | { |
---|
2042 | sc->pages_active++; |
---|
2043 | } |
---|
2044 | } |
---|
2045 | |
---|
2046 | rtems_fdisk_queue_segment (fd, sc); |
---|
2047 | |
---|
2048 | if (rtems_fdisk_is_erased_blocks_starvation (fd)) |
---|
2049 | rtems_fdisk_compact (fd); |
---|
2050 | |
---|
2051 | return ret; |
---|
2052 | } |
---|
2053 | } |
---|
2054 | |
---|
2055 | rtems_fdisk_error ("write-block: no erased page descs in segment: %d-%d", |
---|
2056 | sc->device, sc->segment); |
---|
2057 | |
---|
2058 | sc->failed = true; |
---|
2059 | rtems_fdisk_queue_segment (fd, sc); |
---|
2060 | |
---|
2061 | return EIO; |
---|
2062 | } |
---|
2063 | |
---|
2064 | /** |
---|
2065 | * Disk READ request handler. This primitive copies data from the |
---|
2066 | * flash disk to the supplied buffer and invoke the callout function |
---|
2067 | * to inform upper layer that reading is completed. |
---|
2068 | * |
---|
2069 | * @param req Pointer to the READ block device request info. |
---|
2070 | * @retval 0 Always. The request done callback contains the status. |
---|
2071 | */ |
---|
2072 | static int |
---|
2073 | rtems_fdisk_read (rtems_flashdisk* fd, rtems_blkdev_request* req) |
---|
2074 | { |
---|
2075 | rtems_blkdev_sg_buffer* sg = req->bufs; |
---|
2076 | uint32_t buf; |
---|
2077 | int ret = 0; |
---|
2078 | |
---|
2079 | for (buf = 0; (ret == 0) && (buf < req->bufnum); buf++, sg++) |
---|
2080 | { |
---|
2081 | uint8_t* data; |
---|
2082 | uint32_t fb; |
---|
2083 | uint32_t b; |
---|
2084 | fb = sg->length / fd->block_size; |
---|
2085 | data = sg->buffer; |
---|
2086 | for (b = 0; b < fb; b++, data += fd->block_size) |
---|
2087 | { |
---|
2088 | ret = rtems_fdisk_read_block (fd, sg->block + b, data); |
---|
2089 | if (ret) |
---|
2090 | break; |
---|
2091 | } |
---|
2092 | } |
---|
2093 | |
---|
2094 | rtems_blkdev_request_done (req, ret ? RTEMS_IO_ERROR : RTEMS_SUCCESSFUL); |
---|
2095 | |
---|
2096 | return 0; |
---|
2097 | } |
---|
2098 | |
---|
2099 | /** |
---|
2100 | * Flash disk WRITE request handler. This primitive copies data from |
---|
2101 | * supplied buffer to flash disk and invoke the callout function to inform |
---|
2102 | * upper layer that writing is completed. |
---|
2103 | * |
---|
2104 | * @param req Pointers to the WRITE block device request info. |
---|
2105 | * @retval 0 Always. The request done callback contains the status. |
---|
2106 | */ |
---|
2107 | static int |
---|
2108 | rtems_fdisk_write (rtems_flashdisk* fd, rtems_blkdev_request* req) |
---|
2109 | { |
---|
2110 | rtems_blkdev_sg_buffer* sg = req->bufs; |
---|
2111 | uint32_t buf; |
---|
2112 | int ret = 0; |
---|
2113 | |
---|
2114 | for (buf = 0; (ret == 0) && (buf < req->bufnum); buf++, sg++) |
---|
2115 | { |
---|
2116 | uint8_t* data; |
---|
2117 | uint32_t fb; |
---|
2118 | uint32_t b; |
---|
2119 | fb = sg->length / fd->block_size; |
---|
2120 | data = sg->buffer; |
---|
2121 | for (b = 0; b < fb; b++, data += fd->block_size) |
---|
2122 | { |
---|
2123 | ret = rtems_fdisk_write_block (fd, sg->block + b, data); |
---|
2124 | if (ret) |
---|
2125 | break; |
---|
2126 | } |
---|
2127 | } |
---|
2128 | |
---|
2129 | rtems_blkdev_request_done (req, ret ? RTEMS_IO_ERROR : RTEMS_SUCCESSFUL); |
---|
2130 | |
---|
2131 | return 0; |
---|
2132 | } |
---|
2133 | |
---|
2134 | /** |
---|
2135 | * Flash disk erase disk. |
---|
2136 | * |
---|
2137 | * @param fd The flashdisk data. |
---|
2138 | * @retval int The ioctl return value. |
---|
2139 | */ |
---|
2140 | static int |
---|
2141 | rtems_fdisk_erase_disk (rtems_flashdisk* fd) |
---|
2142 | { |
---|
2143 | uint32_t device; |
---|
2144 | int ret; |
---|
2145 | |
---|
2146 | #if RTEMS_FDISK_TRACE |
---|
2147 | rtems_fdisk_info (fd, "erase-disk"); |
---|
2148 | #endif |
---|
2149 | |
---|
2150 | ret = rtems_fdisk_erase_flash (fd); |
---|
2151 | |
---|
2152 | if (ret == 0) |
---|
2153 | { |
---|
2154 | for (device = 0; device < fd->device_count; device++) |
---|
2155 | { |
---|
2156 | if (!fd->devices[device].segments) |
---|
2157 | return ENOMEM; |
---|
2158 | |
---|
2159 | ret = rtems_fdisk_recover_block_mappings (fd); |
---|
2160 | if (ret) |
---|
2161 | break; |
---|
2162 | } |
---|
2163 | } |
---|
2164 | |
---|
2165 | return ret; |
---|
2166 | } |
---|
2167 | |
---|
2168 | /** |
---|
2169 | * Flash Disk Monitoring data is return in the monitoring data |
---|
2170 | * structure. |
---|
2171 | */ |
---|
2172 | static int |
---|
2173 | rtems_fdisk_monitoring_data (rtems_flashdisk* fd, |
---|
2174 | rtems_fdisk_monitor_data* data) |
---|
2175 | { |
---|
2176 | uint32_t i; |
---|
2177 | uint32_t j; |
---|
2178 | |
---|
2179 | data->block_size = fd->block_size; |
---|
2180 | data->block_count = fd->block_count; |
---|
2181 | data->unavail_blocks = fd->unavail_blocks; |
---|
2182 | data->device_count = fd->device_count; |
---|
2183 | |
---|
2184 | data->blocks_used = 0; |
---|
2185 | for (i = 0; i < fd->block_count; i++) |
---|
2186 | if (fd->blocks[i].segment) |
---|
2187 | data->blocks_used++; |
---|
2188 | |
---|
2189 | data->segs_available = rtems_fdisk_segment_count_queue (&fd->available); |
---|
2190 | data->segs_used = rtems_fdisk_segment_count_queue (&fd->used); |
---|
2191 | data->segs_failed = rtems_fdisk_segment_count_queue (&fd->failed); |
---|
2192 | |
---|
2193 | data->segment_count = 0; |
---|
2194 | data->page_count = 0; |
---|
2195 | data->pages_desc = 0; |
---|
2196 | data->pages_active = 0; |
---|
2197 | data->pages_used = 0; |
---|
2198 | data->pages_bad = 0; |
---|
2199 | data->seg_erases = 0; |
---|
2200 | |
---|
2201 | for (i = 0; i < fd->device_count; i++) |
---|
2202 | { |
---|
2203 | data->segment_count += fd->devices[i].segment_count; |
---|
2204 | |
---|
2205 | for (j = 0; j < fd->devices[i].segment_count; j++) |
---|
2206 | { |
---|
2207 | rtems_fdisk_segment_ctl* sc = &fd->devices[i].segments[j]; |
---|
2208 | |
---|
2209 | data->page_count += sc->pages; |
---|
2210 | data->pages_desc += sc->pages_desc; |
---|
2211 | data->pages_active += sc->pages_active; |
---|
2212 | data->pages_used += sc->pages_used; |
---|
2213 | data->pages_bad += sc->pages_bad; |
---|
2214 | data->seg_erases += sc->erased; |
---|
2215 | } |
---|
2216 | } |
---|
2217 | |
---|
2218 | data->info_level = fd->info_level; |
---|
2219 | return 0; |
---|
2220 | } |
---|
2221 | |
---|
2222 | /** |
---|
2223 | * Print to stdout the status of the driver. This is a debugging aid. |
---|
2224 | */ |
---|
2225 | static int |
---|
2226 | rtems_fdisk_print_status (rtems_flashdisk* fd) |
---|
2227 | { |
---|
2228 | #if RTEMS_FDISK_TRACE |
---|
2229 | uint32_t current_info_level = fd->info_level; |
---|
2230 | uint32_t total; |
---|
2231 | uint32_t count; |
---|
2232 | uint32_t device; |
---|
2233 | |
---|
2234 | fd->info_level = 3; |
---|
2235 | |
---|
2236 | rtems_fdisk_printf (fd, |
---|
2237 | "Flash Disk Driver Status : %d.%d", fd->major, fd->minor); |
---|
2238 | |
---|
2239 | rtems_fdisk_printf (fd, "Block count\t%d", fd->block_count); |
---|
2240 | rtems_fdisk_printf (fd, "Unavail blocks\t%d", fd->unavail_blocks); |
---|
2241 | rtems_fdisk_printf (fd, "Starvation threshold\t%d", fd->starvation_threshold); |
---|
2242 | rtems_fdisk_printf (fd, "Starvations\t%d", fd->starvations); |
---|
2243 | count = rtems_fdisk_segment_count_queue (&fd->available); |
---|
2244 | total = count; |
---|
2245 | rtems_fdisk_printf (fd, "Available queue\t%ld (%ld)", |
---|
2246 | count, rtems_fdisk_segment_queue_count (&fd->available)); |
---|
2247 | count = rtems_fdisk_segment_count_queue (&fd->used); |
---|
2248 | total += count; |
---|
2249 | rtems_fdisk_printf (fd, "Used queue\t%ld (%ld)", |
---|
2250 | count, rtems_fdisk_segment_queue_count (&fd->used)); |
---|
2251 | count = rtems_fdisk_segment_count_queue (&fd->erase); |
---|
2252 | total += count; |
---|
2253 | rtems_fdisk_printf (fd, "Erase queue\t%ld (%ld)", |
---|
2254 | count, rtems_fdisk_segment_queue_count (&fd->erase)); |
---|
2255 | count = rtems_fdisk_segment_count_queue (&fd->failed); |
---|
2256 | total += count; |
---|
2257 | rtems_fdisk_printf (fd, "Failed queue\t%ld (%ld)", |
---|
2258 | count, rtems_fdisk_segment_queue_count (&fd->failed)); |
---|
2259 | |
---|
2260 | count = 0; |
---|
2261 | for (device = 0; device < fd->device_count; device++) |
---|
2262 | count += fd->devices[device].segment_count; |
---|
2263 | |
---|
2264 | rtems_fdisk_printf (fd, "Queue total\t%ld of %ld, %s", total, count, |
---|
2265 | total == count ? "ok" : "MISSING"); |
---|
2266 | |
---|
2267 | rtems_fdisk_printf (fd, "Device count\t%d", fd->device_count); |
---|
2268 | |
---|
2269 | for (device = 0; device < fd->device_count; device++) |
---|
2270 | { |
---|
2271 | uint32_t block; |
---|
2272 | uint32_t seg; |
---|
2273 | |
---|
2274 | rtems_fdisk_printf (fd, " Device\t\t%ld", device); |
---|
2275 | rtems_fdisk_printf (fd, " Segment count\t%ld", |
---|
2276 | fd->devices[device].segment_count); |
---|
2277 | |
---|
2278 | for (seg = 0; seg < fd->devices[device].segment_count; seg++) |
---|
2279 | { |
---|
2280 | rtems_fdisk_segment_ctl* sc = &fd->devices[device].segments[seg]; |
---|
2281 | uint32_t page; |
---|
2282 | uint32_t erased = 0; |
---|
2283 | uint32_t active = 0; |
---|
2284 | uint32_t used = 0; |
---|
2285 | bool is_active = false; |
---|
2286 | char queues[5]; |
---|
2287 | |
---|
2288 | rtems_fdisk_queue_status (fd, sc, queues); |
---|
2289 | |
---|
2290 | for (page = 0; page < sc->pages; page++) |
---|
2291 | { |
---|
2292 | if (rtems_fdisk_page_desc_erased (&sc->page_descriptors[page])) |
---|
2293 | erased++; |
---|
2294 | else if (rtems_fdisk_page_desc_flags_set (&sc->page_descriptors[page], |
---|
2295 | RTEMS_FDISK_PAGE_ACTIVE)) |
---|
2296 | { |
---|
2297 | if (rtems_fdisk_page_desc_flags_set (&sc->page_descriptors[page], |
---|
2298 | RTEMS_FDISK_PAGE_USED)) |
---|
2299 | used++; |
---|
2300 | else |
---|
2301 | { |
---|
2302 | active++; |
---|
2303 | is_active = true; |
---|
2304 | } |
---|
2305 | } |
---|
2306 | |
---|
2307 | for (block = 0; block < fd->block_count; block++) |
---|
2308 | { |
---|
2309 | if ((fd->blocks[block].segment == sc) && |
---|
2310 | (fd->blocks[block].page == page) && !is_active) |
---|
2311 | rtems_fdisk_printf (fd, |
---|
2312 | " %ld\t not active when mapped by block %ld", |
---|
2313 | page, block); |
---|
2314 | } |
---|
2315 | } |
---|
2316 | |
---|
2317 | count = 0; |
---|
2318 | for (block = 0; block < fd->block_count; block++) |
---|
2319 | { |
---|
2320 | if (fd->blocks[block].segment == sc) |
---|
2321 | count++; |
---|
2322 | } |
---|
2323 | |
---|
2324 | rtems_fdisk_printf (fd, " %3ld %s p:%3ld a:%3ld/%3ld" \ |
---|
2325 | " u:%3ld/%3ld e:%3ld/%3ld br:%ld", |
---|
2326 | seg, queues, |
---|
2327 | sc->pages, sc->pages_active, active, |
---|
2328 | sc->pages_used, used, erased, |
---|
2329 | sc->pages - (sc->pages_active + |
---|
2330 | sc->pages_used + sc->pages_bad), |
---|
2331 | count); |
---|
2332 | } |
---|
2333 | } |
---|
2334 | |
---|
2335 | { |
---|
2336 | rtems_fdisk_segment_ctl* sc = fd->used.head; |
---|
2337 | int count = 0; |
---|
2338 | rtems_fdisk_printf (fd, "Used List:"); |
---|
2339 | while (sc) |
---|
2340 | { |
---|
2341 | rtems_fdisk_printf (fd, " %3d %02d:%03d u:%3ld", |
---|
2342 | count, sc->device, sc->segment, sc->pages_used); |
---|
2343 | sc = sc->next; |
---|
2344 | count++; |
---|
2345 | } |
---|
2346 | } |
---|
2347 | fd->info_level = current_info_level; |
---|
2348 | |
---|
2349 | return 0; |
---|
2350 | #else |
---|
2351 | return ENOSYS; |
---|
2352 | #endif |
---|
2353 | } |
---|
2354 | |
---|
2355 | /** |
---|
2356 | * Flash disk IOCTL handler. |
---|
2357 | * |
---|
2358 | * @param dd Disk device. |
---|
2359 | * @param req IOCTL request code. |
---|
2360 | * @param argp IOCTL argument. |
---|
2361 | * @retval The IOCTL return value |
---|
2362 | */ |
---|
2363 | static int |
---|
2364 | rtems_fdisk_ioctl (rtems_disk_device *dd, uint32_t req, void* argp) |
---|
2365 | { |
---|
2366 | dev_t dev = rtems_disk_get_device_identifier (dd); |
---|
2367 | rtems_device_minor_number minor = rtems_filesystem_dev_minor_t (dev); |
---|
2368 | rtems_blkdev_request* r = argp; |
---|
2369 | rtems_status_code sc; |
---|
2370 | |
---|
2371 | errno = 0; |
---|
2372 | |
---|
2373 | sc = rtems_semaphore_obtain (rtems_flashdisks[minor].lock, RTEMS_WAIT, 0); |
---|
2374 | if (sc != RTEMS_SUCCESSFUL) |
---|
2375 | errno = EIO; |
---|
2376 | else |
---|
2377 | { |
---|
2378 | errno = 0; |
---|
2379 | switch (req) |
---|
2380 | { |
---|
2381 | case RTEMS_BLKIO_REQUEST: |
---|
2382 | if ((minor >= rtems_flashdisk_count) || |
---|
2383 | (rtems_flashdisks[minor].device_count == 0)) |
---|
2384 | { |
---|
2385 | errno = ENODEV; |
---|
2386 | } |
---|
2387 | else |
---|
2388 | { |
---|
2389 | switch (r->req) |
---|
2390 | { |
---|
2391 | case RTEMS_BLKDEV_REQ_READ: |
---|
2392 | errno = rtems_fdisk_read (&rtems_flashdisks[minor], r); |
---|
2393 | break; |
---|
2394 | |
---|
2395 | case RTEMS_BLKDEV_REQ_WRITE: |
---|
2396 | errno = rtems_fdisk_write (&rtems_flashdisks[minor], r); |
---|
2397 | break; |
---|
2398 | |
---|
2399 | default: |
---|
2400 | errno = EINVAL; |
---|
2401 | break; |
---|
2402 | } |
---|
2403 | } |
---|
2404 | break; |
---|
2405 | |
---|
2406 | case RTEMS_FDISK_IOCTL_ERASE_DISK: |
---|
2407 | errno = rtems_fdisk_erase_disk (&rtems_flashdisks[minor]); |
---|
2408 | break; |
---|
2409 | |
---|
2410 | case RTEMS_FDISK_IOCTL_COMPACT: |
---|
2411 | errno = rtems_fdisk_compact (&rtems_flashdisks[minor]); |
---|
2412 | break; |
---|
2413 | |
---|
2414 | case RTEMS_FDISK_IOCTL_ERASE_USED: |
---|
2415 | errno = rtems_fdisk_erase_used (&rtems_flashdisks[minor]); |
---|
2416 | break; |
---|
2417 | |
---|
2418 | case RTEMS_FDISK_IOCTL_MONITORING: |
---|
2419 | errno = rtems_fdisk_monitoring_data (&rtems_flashdisks[minor], |
---|
2420 | (rtems_fdisk_monitor_data*) argp); |
---|
2421 | break; |
---|
2422 | |
---|
2423 | case RTEMS_FDISK_IOCTL_INFO_LEVEL: |
---|
2424 | rtems_flashdisks[minor].info_level = (uintptr_t) argp; |
---|
2425 | break; |
---|
2426 | |
---|
2427 | case RTEMS_FDISK_IOCTL_PRINT_STATUS: |
---|
2428 | errno = rtems_fdisk_print_status (&rtems_flashdisks[minor]); |
---|
2429 | break; |
---|
2430 | |
---|
2431 | default: |
---|
2432 | rtems_blkdev_ioctl (dd, req, argp); |
---|
2433 | break; |
---|
2434 | } |
---|
2435 | |
---|
2436 | sc = rtems_semaphore_release (rtems_flashdisks[minor].lock); |
---|
2437 | if (sc != RTEMS_SUCCESSFUL) |
---|
2438 | errno = EIO; |
---|
2439 | } |
---|
2440 | |
---|
2441 | return errno == 0 ? 0 : -1; |
---|
2442 | } |
---|
2443 | |
---|
2444 | /** |
---|
2445 | * Flash disk device driver initialization. |
---|
2446 | * |
---|
2447 | * @todo Memory clean up on error is really badly handled. |
---|
2448 | * |
---|
2449 | * @param major Flash disk major device number. |
---|
2450 | * @param minor Minor device number, not applicable. |
---|
2451 | * @param arg Initialization argument, not applicable. |
---|
2452 | */ |
---|
2453 | rtems_device_driver |
---|
2454 | rtems_fdisk_initialize (rtems_device_major_number major, |
---|
2455 | rtems_device_minor_number minor, |
---|
2456 | void* arg __attribute__((unused))) |
---|
2457 | { |
---|
2458 | const rtems_flashdisk_config* c = rtems_flashdisk_configuration; |
---|
2459 | rtems_flashdisk* fd; |
---|
2460 | rtems_status_code sc; |
---|
2461 | |
---|
2462 | sc = rtems_disk_io_initialize (); |
---|
2463 | if (sc != RTEMS_SUCCESSFUL) |
---|
2464 | return sc; |
---|
2465 | |
---|
2466 | sc = rtems_fdisk_crc16_gen_factors (0x8408); |
---|
2467 | if (sc != RTEMS_SUCCESSFUL) |
---|
2468 | return sc; |
---|
2469 | |
---|
2470 | rtems_flashdisks = calloc (rtems_flashdisk_configuration_size, |
---|
2471 | sizeof (rtems_flashdisk)); |
---|
2472 | |
---|
2473 | if (!rtems_flashdisks) |
---|
2474 | return RTEMS_NO_MEMORY; |
---|
2475 | |
---|
2476 | for (minor = 0; minor < rtems_flashdisk_configuration_size; minor++, c++) |
---|
2477 | { |
---|
2478 | char name[] = RTEMS_FLASHDISK_DEVICE_BASE_NAME "a"; |
---|
2479 | dev_t dev = rtems_filesystem_make_dev_t (major, minor); |
---|
2480 | uint32_t device; |
---|
2481 | uint32_t blocks = 0; |
---|
2482 | int ret; |
---|
2483 | |
---|
2484 | fd = &rtems_flashdisks[minor]; |
---|
2485 | |
---|
2486 | name [sizeof(RTEMS_FLASHDISK_DEVICE_BASE_NAME)] += minor; |
---|
2487 | |
---|
2488 | fd->major = major; |
---|
2489 | fd->minor = minor; |
---|
2490 | fd->flags = c->flags; |
---|
2491 | fd->compact_segs = c->compact_segs; |
---|
2492 | fd->avail_compact_segs = c->avail_compact_segs; |
---|
2493 | fd->block_size = c->block_size; |
---|
2494 | fd->unavail_blocks = c->unavail_blocks; |
---|
2495 | fd->info_level = c->info_level; |
---|
2496 | |
---|
2497 | for (device = 0; device < c->device_count; device++) |
---|
2498 | blocks += rtems_fdisk_blocks_in_device (&c->devices[device], |
---|
2499 | c->block_size); |
---|
2500 | |
---|
2501 | /* |
---|
2502 | * One copy buffer of a page size. |
---|
2503 | */ |
---|
2504 | fd->copy_buffer = malloc (c->block_size); |
---|
2505 | if (!fd->copy_buffer) |
---|
2506 | return RTEMS_NO_MEMORY; |
---|
2507 | |
---|
2508 | fd->blocks = calloc (blocks, sizeof (rtems_fdisk_block_ctl)); |
---|
2509 | if (!fd->blocks) |
---|
2510 | return RTEMS_NO_MEMORY; |
---|
2511 | |
---|
2512 | fd->block_count = blocks; |
---|
2513 | |
---|
2514 | fd->devices = calloc (c->device_count, sizeof (rtems_fdisk_device_ctl)); |
---|
2515 | if (!fd->devices) |
---|
2516 | return RTEMS_NO_MEMORY; |
---|
2517 | |
---|
2518 | sc = rtems_semaphore_create (rtems_build_name ('F', 'D', 'S', 'K'), 1, |
---|
2519 | RTEMS_PRIORITY | RTEMS_BINARY_SEMAPHORE | |
---|
2520 | RTEMS_INHERIT_PRIORITY, 0, &fd->lock); |
---|
2521 | if (sc != RTEMS_SUCCESSFUL) |
---|
2522 | { |
---|
2523 | rtems_fdisk_error ("disk lock create failed"); |
---|
2524 | free (fd->copy_buffer); |
---|
2525 | free (fd->blocks); |
---|
2526 | free (fd->devices); |
---|
2527 | return sc; |
---|
2528 | } |
---|
2529 | |
---|
2530 | sc = rtems_disk_create_phys(dev, c->block_size, |
---|
2531 | blocks - fd->unavail_blocks, |
---|
2532 | rtems_fdisk_ioctl, NULL, name); |
---|
2533 | if (sc != RTEMS_SUCCESSFUL) |
---|
2534 | { |
---|
2535 | rtems_semaphore_delete (fd->lock); |
---|
2536 | rtems_disk_delete (dev); |
---|
2537 | free (fd->copy_buffer); |
---|
2538 | free (fd->blocks); |
---|
2539 | free (fd->devices); |
---|
2540 | rtems_fdisk_error ("disk create phy failed"); |
---|
2541 | return sc; |
---|
2542 | } |
---|
2543 | |
---|
2544 | for (device = 0; device < c->device_count; device++) |
---|
2545 | { |
---|
2546 | rtems_fdisk_segment_ctl* sc; |
---|
2547 | uint32_t segment_count; |
---|
2548 | uint32_t segment; |
---|
2549 | |
---|
2550 | segment_count = rtems_fdisk_count_segments (&c->devices[device]); |
---|
2551 | |
---|
2552 | fd->devices[device].segments = calloc (segment_count, |
---|
2553 | sizeof (rtems_fdisk_segment_ctl)); |
---|
2554 | if (!fd->devices[device].segments) |
---|
2555 | { |
---|
2556 | rtems_disk_delete (dev); |
---|
2557 | rtems_semaphore_delete (fd->lock); |
---|
2558 | free (fd->copy_buffer); |
---|
2559 | free (fd->blocks); |
---|
2560 | free (fd->devices); |
---|
2561 | return RTEMS_NO_MEMORY; |
---|
2562 | } |
---|
2563 | |
---|
2564 | sc = fd->devices[device].segments; |
---|
2565 | |
---|
2566 | for (segment = 0; segment < c->devices[device].segment_count; segment++) |
---|
2567 | { |
---|
2568 | const rtems_fdisk_segment_desc* sd; |
---|
2569 | uint32_t seg_segment; |
---|
2570 | |
---|
2571 | sd = &c->devices[device].segments[segment]; |
---|
2572 | |
---|
2573 | for (seg_segment = 0; seg_segment < sd->count; seg_segment++, sc++) |
---|
2574 | { |
---|
2575 | sc->descriptor = sd; |
---|
2576 | sc->device = device; |
---|
2577 | sc->segment = seg_segment; |
---|
2578 | sc->erased = 0; |
---|
2579 | } |
---|
2580 | } |
---|
2581 | |
---|
2582 | fd->devices[device].segment_count = segment_count; |
---|
2583 | fd->devices[device].descriptor = &c->devices[device]; |
---|
2584 | } |
---|
2585 | |
---|
2586 | fd->device_count = c->device_count; |
---|
2587 | |
---|
2588 | ret = rtems_fdisk_recover_block_mappings (fd); |
---|
2589 | if (ret) |
---|
2590 | { |
---|
2591 | rtems_disk_delete (dev); |
---|
2592 | rtems_semaphore_delete (fd->lock); |
---|
2593 | free (fd->copy_buffer); |
---|
2594 | free (fd->blocks); |
---|
2595 | free (fd->devices); |
---|
2596 | rtems_fdisk_error ("recovery of disk failed: %s (%d)", |
---|
2597 | strerror (ret), ret); |
---|
2598 | return ret; |
---|
2599 | } |
---|
2600 | |
---|
2601 | ret = rtems_fdisk_compact (fd); |
---|
2602 | if (ret) |
---|
2603 | { |
---|
2604 | rtems_disk_delete (dev); |
---|
2605 | rtems_semaphore_delete (fd->lock); |
---|
2606 | free (fd->copy_buffer); |
---|
2607 | free (fd->blocks); |
---|
2608 | free (fd->devices); |
---|
2609 | rtems_fdisk_error ("compacting of disk failed: %s (%d)", |
---|
2610 | strerror (ret), ret); |
---|
2611 | return ret; |
---|
2612 | } |
---|
2613 | } |
---|
2614 | |
---|
2615 | rtems_flashdisk_count = rtems_flashdisk_configuration_size; |
---|
2616 | |
---|
2617 | return RTEMS_SUCCESSFUL; |
---|
2618 | } |
---|