1 | /* |
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2 | * COPYRIGHT (c) 2010 Chris Johns <chrisj@rtems.org> |
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3 | * |
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4 | * The license and distribution terms for this file may be |
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5 | * found in the file LICENSE in this distribution or at |
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6 | * http://www.rtems.com/license/LICENSE. |
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7 | * |
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8 | * $Id$ |
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9 | */ |
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10 | /** |
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11 | * @file |
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12 | * |
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13 | * @ingroup rtems-rfs |
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14 | * |
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15 | * RTEMS File Systems Group Routines. |
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16 | * |
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17 | * These functions open and close a group as well as manage bit allocations |
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18 | * within a group. |
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19 | */ |
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20 | |
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21 | #if HAVE_CONFIG_H |
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22 | #include "config.h" |
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23 | #endif |
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24 | |
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25 | #include <rtems/rfs/rtems-rfs-file-system.h> |
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26 | #include <rtems/rfs/rtems-rfs-group.h> |
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27 | |
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28 | int |
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29 | rtems_rfs_group_open (rtems_rfs_file_system* fs, |
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30 | rtems_rfs_buffer_block base, |
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31 | size_t size, |
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32 | size_t inodes, |
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33 | rtems_rfs_group* group) |
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34 | { |
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35 | int rc; |
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36 | |
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37 | if (base >= rtems_rfs_fs_blocks (fs)) |
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38 | { |
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39 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_GROUP_OPEN)) |
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40 | printf ("rtems-rfs: group-open: base outside file system range: %d: %s\n", |
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41 | EIO, strerror (EIO)); |
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42 | return EIO; |
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43 | } |
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44 | |
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45 | if ((base + size) >= rtems_rfs_fs_blocks (fs)) |
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46 | size = rtems_rfs_fs_blocks (fs) - base; |
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47 | |
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48 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_GROUP_OPEN)) |
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49 | printf ("rtems-rfs: group-open: base=%ld, blocks=%zd inodes=%zd\n", |
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50 | base, size, inodes); |
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51 | |
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52 | group->base = base; |
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53 | group->size = size; |
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54 | |
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55 | rc = rtems_rfs_buffer_handle_open (fs, &group->block_bitmap_buffer); |
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56 | if (rc > 0) |
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57 | { |
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58 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_GROUP_OPEN)) |
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59 | printf ("rtems-rfs: group-open: could not open block bitmap handle: %d: %s\n", |
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60 | rc, strerror (rc)); |
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61 | return rc; |
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62 | } |
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63 | |
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64 | rc = rtems_rfs_bitmap_open (&group->block_bitmap, fs, |
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65 | &group->block_bitmap_buffer, size, |
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66 | group->base + RTEMS_RFS_GROUP_BLOCK_BITMAP_BLOCK); |
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67 | if (rc > 0) |
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68 | { |
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69 | rtems_rfs_buffer_handle_close (fs, &group->block_bitmap_buffer); |
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70 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_GROUP_OPEN)) |
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71 | printf ("rtems-rfs: group-open: could not open block bitmap: %d: %s\n", |
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72 | rc, strerror (rc)); |
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73 | return rc; |
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74 | } |
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75 | |
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76 | rc = rtems_rfs_buffer_handle_open (fs, &group->inode_bitmap_buffer); |
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77 | if (rc > 0) |
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78 | { |
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79 | rtems_rfs_bitmap_close (&group->block_bitmap); |
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80 | rtems_rfs_buffer_handle_close (fs, &group->block_bitmap_buffer); |
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81 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_GROUP_OPEN)) |
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82 | printf ("rtems-rfs: group-open: could not open inode bitmap handle: %d: %s\n", |
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83 | rc, strerror (rc)); |
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84 | return rc; |
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85 | } |
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86 | |
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87 | rc = rtems_rfs_bitmap_open (&group->inode_bitmap, fs, |
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88 | &group->inode_bitmap_buffer, inodes, |
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89 | group->base + RTEMS_RFS_GROUP_INODE_BITMAP_BLOCK); |
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90 | if (rc > 0) |
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91 | { |
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92 | rtems_rfs_buffer_handle_close (fs, &group->inode_bitmap_buffer); |
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93 | rtems_rfs_bitmap_close (&group->block_bitmap); |
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94 | rtems_rfs_buffer_handle_close (fs, &group->block_bitmap_buffer); |
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95 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_GROUP_OPEN)) |
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96 | printf ("rtems-rfs: group-open: could not open inode bitmap: %d: %s\n", |
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97 | rc, strerror (rc)); |
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98 | return rc; |
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99 | } |
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100 | |
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101 | if (rtems_rfs_fs_release_bitmaps (fs)) |
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102 | { |
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103 | rtems_rfs_bitmap_release_buffer (fs, &group->block_bitmap); |
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104 | rtems_rfs_bitmap_release_buffer (fs, &group->inode_bitmap); |
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105 | } |
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106 | |
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107 | return 0; |
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108 | } |
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109 | |
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110 | int |
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111 | rtems_rfs_group_close (rtems_rfs_file_system* fs, rtems_rfs_group* group) |
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112 | { |
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113 | int result = 0; |
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114 | int rc; |
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115 | |
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116 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_GROUP_CLOSE)) |
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117 | printf ("rtems-rfs: group-close: base=%ld\n", group->base); |
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118 | |
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119 | /* |
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120 | * We need to close as much as possible and also return any error if one |
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121 | * occurs but this may result in one even more important error being lost but |
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122 | * we cannot OR the errors together so this is a reasonable compromise. |
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123 | */ |
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124 | rc = rtems_rfs_bitmap_close (&group->inode_bitmap); |
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125 | if (rc > 0) |
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126 | result = rc; |
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127 | rc = rtems_rfs_buffer_handle_close (fs, &group->inode_bitmap_buffer); |
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128 | if (rc > 0) |
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129 | result = rc; |
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130 | rc = rtems_rfs_bitmap_close (&group->block_bitmap); |
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131 | if (rc > 0) |
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132 | result = rc; |
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133 | rc = rtems_rfs_buffer_handle_close (fs, &group->block_bitmap_buffer); |
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134 | if (rc > 0) |
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135 | result = rc; |
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136 | |
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137 | return result; |
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138 | } |
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139 | |
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140 | int |
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141 | rtems_rfs_group_bitmap_alloc (rtems_rfs_file_system* fs, |
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142 | rtems_rfs_bitmap_bit goal, |
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143 | bool inode, |
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144 | rtems_rfs_bitmap_bit* result) |
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145 | { |
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146 | int group_start; |
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147 | size_t size; |
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148 | rtems_rfs_bitmap_bit bit; |
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149 | int offset; |
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150 | bool updown; |
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151 | int direction; |
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152 | |
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153 | if (inode) |
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154 | { |
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155 | size = fs->group_inodes; |
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156 | goal -= RTEMS_RFS_ROOT_INO; |
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157 | } |
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158 | else |
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159 | size = fs->group_blocks; |
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160 | |
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161 | group_start = goal / size; |
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162 | bit = (rtems_rfs_bitmap_bit) (goal % size); |
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163 | offset = 0; |
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164 | updown = true; |
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165 | direction = 1; |
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166 | |
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167 | /* |
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168 | * Try the goal group first and if that group fails try the groups either |
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169 | * side until the whole file system has be tried. |
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170 | */ |
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171 | while (true) |
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172 | { |
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173 | rtems_rfs_bitmap_control* bitmap; |
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174 | int group; |
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175 | bool allocated = false; |
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176 | int rc; |
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177 | |
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178 | /* |
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179 | * We can start at any location and we move out from that point in each |
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180 | * direction. The offset grows until we find a free bit or we hit an end. |
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181 | */ |
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182 | group = group_start + (direction * offset); |
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183 | if (offset) |
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184 | bit = direction > 0 ? 0 : size - 1; |
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185 | |
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186 | /* |
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187 | * If we are still looking up and down and if the group is out of range we |
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188 | * have reached one end. Stopping looking up and down and just move in the |
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189 | * one direction one group at a time. |
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190 | */ |
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191 | if ((group < 0) || (group >= fs->group_count)) |
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192 | { |
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193 | if (!updown) |
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194 | break; |
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195 | direction = direction > 0 ? -1 : 1; |
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196 | updown = false; |
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197 | continue; |
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198 | } |
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199 | |
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200 | if (inode) |
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201 | bitmap = &fs->groups[group].inode_bitmap; |
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202 | else |
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203 | bitmap = &fs->groups[group].block_bitmap; |
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204 | |
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205 | rc = rtems_rfs_bitmap_map_alloc (bitmap, bit, &allocated, &bit); |
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206 | if (rc > 0) |
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207 | return rc; |
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208 | |
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209 | if (rtems_rfs_fs_release_bitmaps (fs)) |
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210 | rtems_rfs_bitmap_release_buffer (fs, bitmap); |
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211 | |
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212 | if (allocated) |
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213 | { |
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214 | if (inode) |
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215 | *result = rtems_rfs_group_inode (fs, group, bit); |
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216 | else |
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217 | *result = rtems_rfs_group_block (&fs->groups[group], bit); |
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218 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_GROUP_BITMAPS)) |
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219 | printf ("rtems-rfs: group-bitmap-alloc: %s allocated: %ld\n", |
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220 | inode ? "inode" : "block", *result); |
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221 | return 0; |
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222 | } |
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223 | |
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224 | if (updown) |
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225 | direction = direction > 0 ? -1 : 1; |
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226 | |
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227 | offset++; |
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228 | } |
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229 | |
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230 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_GROUP_BITMAPS)) |
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231 | printf ("rtems-rfs: group-bitmap-alloc: no blocks available\n"); |
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232 | |
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233 | return ENOSPC; |
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234 | } |
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235 | |
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236 | int |
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237 | rtems_rfs_group_bitmap_free (rtems_rfs_file_system* fs, |
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238 | bool inode, |
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239 | rtems_rfs_bitmap_bit no) |
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240 | { |
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241 | rtems_rfs_bitmap_control* bitmap; |
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242 | unsigned int group; |
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243 | rtems_rfs_bitmap_bit bit; |
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244 | size_t size; |
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245 | int rc; |
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246 | |
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247 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_GROUP_BITMAPS)) |
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248 | printf ("rtems-rfs: group-bitmap-free: %s free: %ld\n", |
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249 | inode ? "inode" : "block", no); |
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250 | |
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251 | if (inode) |
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252 | { |
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253 | no -= RTEMS_RFS_ROOT_INO; |
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254 | size = fs->group_inodes; |
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255 | } |
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256 | else |
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257 | { |
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258 | no -= RTEMS_RFS_SUPERBLOCK_SIZE; |
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259 | size = fs->group_blocks; |
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260 | } |
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261 | |
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262 | group = no / size; |
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263 | bit = (rtems_rfs_bitmap_bit) (no % size); |
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264 | |
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265 | if (inode) |
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266 | bitmap = &fs->groups[group].inode_bitmap; |
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267 | else |
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268 | bitmap = &fs->groups[group].block_bitmap; |
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269 | |
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270 | rc = rtems_rfs_bitmap_map_clear (bitmap, bit); |
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271 | |
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272 | rtems_rfs_bitmap_release_buffer (fs, bitmap); |
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273 | |
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274 | return rc; |
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275 | } |
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276 | |
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277 | int |
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278 | rtems_rfs_group_bitmap_test (rtems_rfs_file_system* fs, |
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279 | bool inode, |
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280 | rtems_rfs_bitmap_bit no, |
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281 | bool* state) |
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282 | { |
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283 | rtems_rfs_bitmap_control* bitmap; |
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284 | unsigned int group; |
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285 | rtems_rfs_bitmap_bit bit; |
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286 | size_t size; |
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287 | int rc; |
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288 | |
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289 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_GROUP_BITMAPS)) |
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290 | printf ("rtems-rfs: group-bitmap-test: %s test: %ld\n", |
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291 | inode ? "inode" : "block", no); |
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292 | |
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293 | if (inode) |
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294 | { |
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295 | if ((no < RTEMS_RFS_ROOT_INO) || (no > rtems_rfs_fs_inodes (fs))) |
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296 | return EINVAL; |
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297 | no -= RTEMS_RFS_ROOT_INO; |
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298 | size = fs->group_inodes; |
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299 | } |
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300 | else |
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301 | { |
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302 | if (no >= rtems_rfs_fs_blocks (fs)) |
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303 | return EINVAL; |
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304 | size = fs->group_blocks; |
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305 | } |
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306 | |
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307 | group = no / size; |
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308 | bit = (rtems_rfs_bitmap_bit) (no % size); |
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309 | |
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310 | if (inode) |
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311 | bitmap = &fs->groups[group].inode_bitmap; |
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312 | else |
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313 | bitmap = &fs->groups[group].block_bitmap; |
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314 | |
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315 | rc = rtems_rfs_bitmap_map_test (bitmap, bit, state); |
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316 | |
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317 | rtems_rfs_bitmap_release_buffer (fs, bitmap); |
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318 | |
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319 | return rc; |
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320 | } |
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321 | |
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322 | int |
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323 | rtems_rfs_group_usage (rtems_rfs_file_system* fs, |
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324 | size_t* blocks, |
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325 | size_t* inodes) |
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326 | { |
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327 | int g; |
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328 | |
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329 | *blocks = 0; |
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330 | *inodes = 0; |
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331 | |
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332 | for (g = 0; g < fs->group_count; g++) |
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333 | { |
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334 | rtems_rfs_group* group = &fs->groups[g]; |
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335 | *blocks += |
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336 | rtems_rfs_bitmap_map_size(&group->block_bitmap) - |
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337 | rtems_rfs_bitmap_map_free (&group->block_bitmap); |
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338 | *inodes += |
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339 | rtems_rfs_bitmap_map_size (&group->inode_bitmap) - |
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340 | rtems_rfs_bitmap_map_free (&group->inode_bitmap); |
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341 | } |
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342 | |
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343 | if (*blocks > rtems_rfs_fs_blocks (fs)) |
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344 | *blocks = rtems_rfs_fs_blocks (fs); |
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345 | if (*inodes > rtems_rfs_fs_inodes (fs)) |
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346 | *inodes = rtems_rfs_fs_inodes (fs); |
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347 | |
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348 | return 0; |
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349 | } |
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350 | |
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