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 Directory Routines. |
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16 | * |
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17 | * These functions manage blocks in the directory format. A directory entry is |
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18 | * a variable length record in the block. The entry consists of a length, hash |
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19 | * and the string. The length allows the next entry to be located and the hash |
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20 | * allows a simple check to be performed wihtout a string compare. Directory |
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21 | * entries do not span a block and removal of an entry results in the space in |
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22 | * the block being compacted and the spare area being initialised to ones. |
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23 | * |
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24 | * The maximum length can be 1 or 2 bytes depending on the value in the |
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25 | * superblock. |
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26 | */ |
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27 | |
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28 | #include <rtems/rfs/rtems-rfs-block.h> |
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29 | #include <rtems/rfs/rtems-rfs-buffer.h> |
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30 | #include <rtems/rfs/rtems-rfs-file-system.h> |
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31 | #include <rtems/rfs/rtems-rfs-trace.h> |
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32 | #include <rtems/rfs/rtems-rfs-dir.h> |
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33 | #include <rtems/rfs/rtems-rfs-dir-hash.h> |
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34 | |
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35 | /** |
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36 | * Validate the directory entry data. |
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37 | */ |
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38 | #define rtems_rfs_dir_entry_valid(_f, _l, _i) \ |
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39 | (((_l) <= RTEMS_RFS_DIR_ENTRY_SIZE) || ((_l) >= rtems_rfs_fs_max_name (_f)) \ |
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40 | || (_i < RTEMS_RFS_ROOT_INO) || (_i > rtems_rfs_fs_inodes (_f))) |
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41 | |
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42 | int |
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43 | rtems_rfs_dir_lookup_ino (rtems_rfs_file_system* fs, |
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44 | rtems_rfs_inode_handle* inode, |
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45 | const char* name, |
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46 | int length, |
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47 | rtems_rfs_ino* ino, |
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48 | uint32_t* offset) |
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49 | { |
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50 | rtems_rfs_block_map map; |
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51 | rtems_rfs_buffer_handle entries; |
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52 | int rc; |
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53 | |
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54 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
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55 | { |
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56 | int c; |
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57 | printf ("rtems-rfs: dir-lookup-ino: lookup ino: root=%ld, path=", |
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58 | inode->ino); |
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59 | for (c = 0; c < length; c++) |
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60 | printf ("%c", name[c]); |
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61 | printf (", len=%d\n", length); |
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62 | } |
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63 | |
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64 | *ino = RTEMS_RFS_EMPTY_INO; |
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65 | *offset = 0; |
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66 | |
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67 | rc = rtems_rfs_block_map_open (fs, inode, &map); |
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68 | if (rc > 0) |
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69 | { |
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70 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
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71 | printf ("rtems-rfs: dir-lookup-ino: map open failed for ino %lu: %d: %s", |
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72 | rtems_rfs_inode_ino (inode), 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, &entries); |
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77 | if (rc > 0) |
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78 | { |
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79 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
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80 | printf ("rtems-rfs: dir-lookup-ino: handle open failed for ino %lu: %d: %s", |
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81 | rtems_rfs_inode_ino (inode), rc, strerror (rc)); |
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82 | rtems_rfs_block_map_close (fs, &map); |
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83 | return rc; |
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84 | } |
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85 | else |
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86 | { |
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87 | rtems_rfs_block_no block; |
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88 | uint32_t hash; |
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89 | |
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90 | /* |
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91 | * Calculate the hash of the look up string. |
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92 | */ |
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93 | hash = rtems_rfs_dir_hash (name, length); |
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94 | |
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95 | /* |
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96 | * Locate the first block. The map points to the start after open so just |
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97 | * seek 0. If an error the block will be 0. |
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98 | */ |
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99 | rc = rtems_rfs_block_map_seek (fs, &map, 0, &block); |
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100 | if (rc > 0) |
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101 | { |
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102 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
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103 | printf ("rtems-rfs: dir-lookup-ino: block map find failed: %d: %s\n", |
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104 | rc, strerror (rc)); |
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105 | if (rc == ENXIO) |
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106 | rc = ENOENT; |
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107 | rtems_rfs_buffer_handle_close (fs, &entries); |
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108 | rtems_rfs_block_map_close (fs, &map); |
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109 | return rc; |
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110 | } |
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111 | |
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112 | while ((rc == 0) && block) |
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113 | { |
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114 | uint8_t* entry; |
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115 | |
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116 | rc = rtems_rfs_buffer_handle_request (fs, &entries, block, true); |
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117 | if (rc > 0) |
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118 | { |
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119 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
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120 | printf ("rtems-rfs: dir-lookup-ino: block read, ino=%lu block=%ld: %d: %s\n", |
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121 | rtems_rfs_inode_ino (inode), block, rc, strerror (rc)); |
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122 | break; |
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123 | } |
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124 | |
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125 | /* |
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126 | * Search the block to see if the name matches. A hash of 0xffff or 0x0 |
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127 | * means the entry is empty. |
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128 | */ |
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129 | |
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130 | entry = rtems_rfs_buffer_data (&entries); |
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131 | |
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132 | map.bpos.boff = 0; |
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133 | |
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134 | while (map.bpos.boff < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
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135 | { |
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136 | uint32_t ehash; |
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137 | int elength; |
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138 | |
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139 | ehash = rtems_rfs_dir_entry_hash (entry); |
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140 | elength = rtems_rfs_dir_entry_length (entry); |
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141 | *ino = rtems_rfs_dir_entry_ino (entry); |
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142 | |
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143 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
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144 | break; |
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145 | |
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146 | if (rtems_rfs_dir_entry_valid (fs, elength, *ino)) |
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147 | { |
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148 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
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149 | printf ("rtems-rfs: dir-lookup-ino: " \ |
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150 | "bad length or ino for ino %lu: %u/%ld @ %04lx\n", |
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151 | rtems_rfs_inode_ino (inode), elength, *ino, map.bpos.boff); |
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152 | rc = EIO; |
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153 | break; |
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154 | } |
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155 | |
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156 | if (ehash == hash) |
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157 | { |
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158 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO_CHECK)) |
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159 | printf ("rtems-rfs: dir-lookup-ino: " \ |
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160 | "checking entry for ino %ld: off=%04lx length:%d ino:%d\n", |
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161 | rtems_rfs_inode_ino (inode), map.bpos.boff, |
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162 | elength, rtems_rfs_dir_entry_ino (entry)); |
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163 | |
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164 | if (memcmp (entry + RTEMS_RFS_DIR_ENTRY_SIZE, name, length) == 0) |
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165 | { |
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166 | *offset = rtems_rfs_block_map_pos (fs, &map); |
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167 | |
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168 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO_FOUND)) |
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169 | printf ("rtems-rfs: dir-lookup-ino: " \ |
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170 | "entry found in ino %lu, ino=%lu offset=%lu\n", |
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171 | rtems_rfs_inode_ino (inode), *ino, *offset); |
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172 | |
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173 | rtems_rfs_buffer_handle_close (fs, &entries); |
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174 | rtems_rfs_block_map_close (fs, &map); |
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175 | return 0; |
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176 | } |
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177 | } |
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178 | |
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179 | map.bpos.boff += elength; |
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180 | entry += elength; |
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181 | } |
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182 | |
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183 | if (rc == 0) |
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184 | { |
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185 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
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186 | if ((rc > 0) && (rc != ENXIO)) |
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187 | { |
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188 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
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189 | printf ("rtems-rfs: dir-lookup-ino: " \ |
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190 | "block map next block failed in ino %lu: %d: %s\n", |
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191 | rtems_rfs_inode_ino (inode), rc, strerror (rc)); |
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192 | } |
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193 | if (rc == ENXIO) |
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194 | rc = ENOENT; |
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195 | } |
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196 | } |
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197 | |
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198 | if ((rc == 0) && (block == 0)) |
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199 | { |
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200 | rc = EIO; |
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201 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
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202 | printf ("rtems-rfs: dir-lookup-ino: block is 0 in ino %lu: %d: %s\n", |
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203 | rtems_rfs_inode_ino (inode), rc, strerror (rc)); |
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204 | } |
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205 | } |
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206 | |
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207 | rtems_rfs_buffer_handle_close (fs, &entries); |
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208 | rtems_rfs_block_map_close (fs, &map); |
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209 | return rc; |
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210 | } |
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211 | |
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212 | int |
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213 | rtems_rfs_dir_add_entry (rtems_rfs_file_system* fs, |
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214 | rtems_rfs_inode_handle* dir, |
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215 | const char* name, |
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216 | size_t length, |
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217 | rtems_rfs_ino ino) |
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218 | { |
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219 | rtems_rfs_block_map map; |
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220 | rtems_rfs_block_pos bpos; |
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221 | rtems_rfs_buffer_handle buffer; |
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222 | int rc; |
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223 | |
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224 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
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225 | { |
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226 | int c; |
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227 | printf ("rtems-rfs: dir-add-entry: dir=%ld, name=", |
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228 | rtems_rfs_inode_ino (dir)); |
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229 | for (c = 0; c < length; c++) |
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230 | printf ("%c", name[c]); |
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231 | printf (", len=%zd\n", length); |
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232 | } |
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233 | |
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234 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
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235 | if (rc > 0) |
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236 | return rc; |
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237 | |
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238 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
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239 | if (rc > 0) |
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240 | { |
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241 | rtems_rfs_block_map_close (fs, &map); |
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242 | return rc; |
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243 | } |
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244 | |
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245 | /* |
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246 | * Search the map from the beginning to find any empty space. |
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247 | */ |
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248 | rtems_rfs_block_set_bpos_zero (&bpos); |
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249 | |
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250 | while (true) |
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251 | { |
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252 | rtems_rfs_block_no block; |
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253 | uint8_t* entry; |
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254 | int offset; |
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255 | bool read = true; |
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256 | |
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257 | /* |
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258 | * Locate the first block. If an error the block will be 0. If the map is |
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259 | * empty which happens when creating a directory and adding the first entry |
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260 | * the seek will return ENXIO. In this case we need to grow the directory. |
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261 | */ |
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262 | rc = rtems_rfs_block_map_find (fs, &map, &bpos, &block); |
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263 | if (rc > 0) |
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264 | { |
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265 | if (rc != ENXIO) |
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266 | { |
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267 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
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268 | printf ("rtems-rfs: dir-add-entry: " \ |
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269 | "block map find failed for ino %lu: %d: %s\n", |
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270 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
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271 | break; |
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272 | } |
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273 | |
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274 | /* |
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275 | * We have reached the end of the directory so add a block. |
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276 | */ |
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277 | rc = rtems_rfs_block_map_grow (fs, &map, 1, &block); |
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278 | if (rc > 0) |
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279 | { |
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280 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
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281 | printf ("rtems-rfs: dir-add-entry: " \ |
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282 | "block map grow failed for ino %lu: %d: %s\n", |
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283 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
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284 | break; |
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285 | } |
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286 | |
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287 | read = false; |
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288 | } |
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289 | |
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290 | bpos.bno++; |
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291 | |
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292 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, read); |
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293 | if (rc > 0) |
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294 | { |
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295 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
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296 | printf ("rtems-rfs: dir-add-entry: " \ |
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297 | "block buffer req failed for ino %lu: %d: %s\n", |
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298 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
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299 | break; |
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300 | } |
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301 | |
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302 | entry = rtems_rfs_buffer_data (&buffer); |
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303 | |
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304 | if (!read) |
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305 | memset (entry, 0xff, rtems_rfs_fs_block_size (fs)); |
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306 | |
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307 | offset = 0; |
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308 | |
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309 | while (offset < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
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310 | { |
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311 | rtems_rfs_ino eino; |
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312 | int elength; |
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313 | |
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314 | elength = rtems_rfs_dir_entry_length (entry); |
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315 | eino = rtems_rfs_dir_entry_ino (entry); |
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316 | |
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317 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
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318 | { |
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319 | if ((length + RTEMS_RFS_DIR_ENTRY_SIZE) < |
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320 | (rtems_rfs_fs_block_size (fs) - offset)) |
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321 | { |
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322 | uint32_t hash; |
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323 | hash = rtems_rfs_dir_hash (name, length); |
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324 | rtems_rfs_dir_set_entry_hash (entry, hash); |
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325 | rtems_rfs_dir_set_entry_ino (entry, ino); |
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326 | rtems_rfs_dir_set_entry_length (entry, |
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327 | RTEMS_RFS_DIR_ENTRY_SIZE + length); |
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328 | memcpy (entry + RTEMS_RFS_DIR_ENTRY_SIZE, name, length); |
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329 | rtems_rfs_buffer_mark_dirty (&buffer); |
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330 | rtems_rfs_buffer_handle_close (fs, &buffer); |
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331 | rtems_rfs_block_map_close (fs, &map); |
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332 | return 0; |
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333 | } |
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334 | |
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335 | break; |
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336 | } |
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337 | |
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338 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
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339 | { |
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340 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
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341 | printf ("rtems-rfs: dir-add-entry: " \ |
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342 | "bad length or ino for ino %lu: %u/%ld @ %04x\n", |
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343 | rtems_rfs_inode_ino (dir), elength, eino, offset); |
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344 | rtems_rfs_buffer_handle_close (fs, &buffer); |
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345 | rtems_rfs_block_map_close (fs, &map); |
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346 | return EIO; |
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347 | } |
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348 | |
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349 | entry += elength; |
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350 | offset += elength; |
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351 | } |
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352 | } |
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353 | |
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354 | rtems_rfs_buffer_handle_close (fs, &buffer); |
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355 | rtems_rfs_block_map_close (fs, &map); |
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356 | return rc; |
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357 | } |
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358 | |
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359 | int |
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360 | rtems_rfs_dir_del_entry (rtems_rfs_file_system* fs, |
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361 | rtems_rfs_inode_handle* dir, |
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362 | rtems_rfs_ino ino, |
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363 | uint32_t offset) |
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364 | { |
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365 | rtems_rfs_block_map map; |
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366 | rtems_rfs_block_no block; |
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367 | rtems_rfs_buffer_handle buffer; |
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368 | bool search; |
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369 | int rc; |
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370 | |
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371 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
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372 | printf ("rtems-rfs: dir-del-entry: dir=%ld, entry=%ld offset=%lu\n", |
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373 | rtems_rfs_inode_ino (dir), ino, offset); |
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374 | |
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375 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
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376 | if (rc > 0) |
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377 | return rc; |
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378 | |
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379 | rc = rtems_rfs_block_map_seek (fs, &map, offset, &block); |
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380 | if (rc > 0) |
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381 | { |
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382 | if (rc == ENXIO) |
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383 | rc = ENOENT; |
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384 | rtems_rfs_block_map_close (fs, &map); |
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385 | return rc; |
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386 | } |
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387 | |
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388 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
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389 | if (rc > 0) |
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390 | { |
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391 | rtems_rfs_block_map_close (fs, &map); |
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392 | return rc; |
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393 | } |
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394 | |
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395 | /* |
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396 | * Only search if the offset is 0 else we are at that position. |
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397 | */ |
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398 | search = offset ? false : true; |
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399 | |
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400 | while (rc == 0) |
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401 | { |
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402 | uint8_t* entry; |
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403 | int offset; |
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404 | |
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405 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, true); |
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406 | if (rc > 0) |
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407 | { |
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408 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
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409 | printf ("rtems-rfs: dir-del-entry: " \ |
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410 | "block buffer req failed for ino %lu: %d: %s\n", |
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411 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
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412 | break; |
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413 | } |
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414 | |
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415 | entry = rtems_rfs_buffer_data (&buffer); |
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416 | offset = 0; |
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417 | |
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418 | while (offset < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
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419 | { |
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420 | rtems_rfs_ino eino; |
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421 | int elength; |
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422 | |
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423 | elength = rtems_rfs_dir_entry_length (entry); |
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424 | eino = rtems_rfs_dir_entry_ino (entry); |
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425 | |
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426 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
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427 | break; |
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428 | |
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429 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
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430 | { |
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431 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
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432 | printf ("rtems-rfs: dir-del-entry: " \ |
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433 | "bad length or ino for ino %lu: %u/%ld @ %04x\n", |
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434 | rtems_rfs_inode_ino (dir), elength, eino, offset); |
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435 | rc = EIO; |
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436 | break; |
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437 | } |
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438 | |
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439 | if (ino == rtems_rfs_dir_entry_ino (entry)) |
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440 | { |
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441 | uint32_t remaining; |
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442 | remaining = rtems_rfs_fs_block_size (fs) - (offset + elength); |
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443 | memmove (entry, entry + elength, remaining); |
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444 | memset (entry + remaining, 0xff, elength); |
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445 | |
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446 | /* |
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447 | * If the remainder of the block is empty and this is the start of the |
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448 | * block and it is the last block in the map shrink the map. |
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449 | * |
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450 | * @note We could check again to see if the new end block in the map is |
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451 | * also empty. This way we could clean up an empty directory. |
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452 | */ |
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453 | elength = rtems_rfs_dir_entry_length (entry); |
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454 | |
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455 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
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456 | printf ("rtems-rfs: dir-del-entry: " \ |
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457 | "last block free for ino %lu: elength=%i offset=%d last=%s\n", |
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458 | ino, elength, offset, |
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459 | rtems_rfs_block_map_last (&map) ? "yes" : "no"); |
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460 | |
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461 | if ((elength == RTEMS_RFS_DIR_ENTRY_EMPTY) && |
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462 | (offset == 0) && rtems_rfs_block_map_last (&map)) |
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463 | { |
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464 | rc = rtems_rfs_block_map_shrink (fs, &map, 1); |
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465 | if (rc > 0) |
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466 | { |
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467 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
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468 | printf ("rtems-rfs: dir-del-entry: " \ |
---|
469 | "block map shrink failed for ino %lu: %d: %s\n", |
---|
470 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
---|
471 | } |
---|
472 | } |
---|
473 | |
---|
474 | rtems_rfs_buffer_mark_dirty (&buffer); |
---|
475 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
476 | rtems_rfs_block_map_close (fs, &map); |
---|
477 | return 0; |
---|
478 | } |
---|
479 | |
---|
480 | if (!search) |
---|
481 | { |
---|
482 | rc = EIO; |
---|
483 | break; |
---|
484 | } |
---|
485 | |
---|
486 | entry += elength; |
---|
487 | offset += elength; |
---|
488 | } |
---|
489 | |
---|
490 | if (rc == 0) |
---|
491 | { |
---|
492 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
---|
493 | if (rc == ENXIO) |
---|
494 | rc = ENOENT; |
---|
495 | } |
---|
496 | } |
---|
497 | |
---|
498 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
499 | rtems_rfs_block_map_close (fs, &map); |
---|
500 | return rc; |
---|
501 | } |
---|
502 | |
---|
503 | int |
---|
504 | rtems_rfs_dir_read (rtems_rfs_file_system* fs, |
---|
505 | rtems_rfs_inode_handle* dir, |
---|
506 | rtems_rfs_pos_rel offset, |
---|
507 | struct dirent* dirent, |
---|
508 | size_t* length) |
---|
509 | { |
---|
510 | rtems_rfs_block_map map; |
---|
511 | rtems_rfs_buffer_handle buffer; |
---|
512 | rtems_rfs_block_no block; |
---|
513 | int rc; |
---|
514 | |
---|
515 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
516 | printf ("rtems-rfs: dir-read: dir=%ld offset=%Ld\n", |
---|
517 | rtems_rfs_inode_ino (dir), offset); |
---|
518 | |
---|
519 | *length = 0; |
---|
520 | |
---|
521 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
---|
522 | if (rc > 0) |
---|
523 | return rc; |
---|
524 | |
---|
525 | if (((rtems_rfs_fs_block_size (fs) - |
---|
526 | (offset % rtems_rfs_fs_block_size (fs))) <= RTEMS_RFS_DIR_ENTRY_SIZE)) |
---|
527 | offset = (((offset / rtems_rfs_fs_block_size (fs)) + 1) * |
---|
528 | rtems_rfs_fs_block_size (fs)); |
---|
529 | |
---|
530 | rc = rtems_rfs_block_map_seek (fs, &map, offset, &block); |
---|
531 | if (rc > 0) |
---|
532 | { |
---|
533 | if (rc == ENXIO) |
---|
534 | rc = ENOENT; |
---|
535 | rtems_rfs_block_map_close (fs, &map); |
---|
536 | return rc; |
---|
537 | } |
---|
538 | |
---|
539 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
---|
540 | if (rc > 0) |
---|
541 | { |
---|
542 | rtems_rfs_block_map_close (fs, &map); |
---|
543 | return rc; |
---|
544 | } |
---|
545 | |
---|
546 | /* |
---|
547 | * Look for an empty entry and if this is the last block that is the end of |
---|
548 | * the directory. |
---|
549 | */ |
---|
550 | while (rc == 0) |
---|
551 | { |
---|
552 | uint8_t* entry; |
---|
553 | rtems_rfs_ino eino; |
---|
554 | int elength; |
---|
555 | int remaining; |
---|
556 | |
---|
557 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, true); |
---|
558 | if (rc > 0) |
---|
559 | { |
---|
560 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
561 | rtems_rfs_block_map_close (fs, &map); |
---|
562 | return rc; |
---|
563 | } |
---|
564 | |
---|
565 | entry = rtems_rfs_buffer_data (&buffer); |
---|
566 | entry += map.bpos.boff; |
---|
567 | |
---|
568 | elength = rtems_rfs_dir_entry_length (entry); |
---|
569 | eino = rtems_rfs_dir_entry_ino (entry); |
---|
570 | |
---|
571 | if (elength != RTEMS_RFS_DIR_ENTRY_EMPTY) |
---|
572 | { |
---|
573 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
---|
574 | { |
---|
575 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
576 | printf ("rtems-rfs: dir-read: " \ |
---|
577 | "bad length or ino for ino %lu: %u/%ld @ %04lx\n", |
---|
578 | rtems_rfs_inode_ino (dir), elength, eino, map.bpos.boff); |
---|
579 | rc = EIO; |
---|
580 | break; |
---|
581 | } |
---|
582 | |
---|
583 | memset (dirent, 0, sizeof (struct dirent)); |
---|
584 | dirent->d_off = offset; |
---|
585 | dirent->d_reclen = sizeof (struct dirent); |
---|
586 | |
---|
587 | *length += elength; |
---|
588 | |
---|
589 | remaining = rtems_rfs_fs_block_size (fs) - (map.bpos.boff + elength); |
---|
590 | |
---|
591 | if (remaining <= RTEMS_RFS_DIR_ENTRY_SIZE) |
---|
592 | *length += remaining; |
---|
593 | |
---|
594 | if (elength < RTEMS_RFS_DIR_ENTRY_SIZE) |
---|
595 | elength = 0; |
---|
596 | else |
---|
597 | elength -= RTEMS_RFS_DIR_ENTRY_SIZE; |
---|
598 | if (elength > NAME_MAX) |
---|
599 | elength = NAME_MAX; |
---|
600 | |
---|
601 | memcpy (dirent->d_name, entry + RTEMS_RFS_DIR_ENTRY_SIZE, elength); |
---|
602 | |
---|
603 | dirent->d_ino = rtems_rfs_dir_entry_ino (entry); |
---|
604 | dirent->d_namlen = elength; |
---|
605 | |
---|
606 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
607 | printf ("rtems-rfs: dir-read: found off:%Ld ino:%ld name=%s\n", |
---|
608 | dirent->d_off, dirent->d_ino, dirent->d_name); |
---|
609 | break; |
---|
610 | } |
---|
611 | |
---|
612 | *length += rtems_rfs_fs_block_size (fs) - map.bpos.boff; |
---|
613 | |
---|
614 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
615 | printf ("rtems-rfs: dir-read: next block: off:%ld length:%zd\n", |
---|
616 | (uint32_t) offset, *length); |
---|
617 | |
---|
618 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
---|
619 | if (rc == ENXIO) |
---|
620 | rc = ENOENT; |
---|
621 | } |
---|
622 | |
---|
623 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
624 | rtems_rfs_block_map_close (fs, &map); |
---|
625 | return rc; |
---|
626 | } |
---|
627 | |
---|
628 | int |
---|
629 | rtems_rfs_dir_empty (rtems_rfs_file_system* fs, |
---|
630 | rtems_rfs_inode_handle* dir) |
---|
631 | { |
---|
632 | rtems_rfs_block_map map; |
---|
633 | rtems_rfs_buffer_handle buffer; |
---|
634 | rtems_rfs_block_no block; |
---|
635 | bool empty; |
---|
636 | int rc; |
---|
637 | |
---|
638 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
639 | printf ("rtems-rfs: dir-empty: dir=%ld\n", rtems_rfs_inode_ino (dir)); |
---|
640 | |
---|
641 | empty = true; |
---|
642 | |
---|
643 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
---|
644 | if (rc > 0) |
---|
645 | return rc; |
---|
646 | |
---|
647 | rc = rtems_rfs_block_map_seek (fs, &map, 0, &block); |
---|
648 | if (rc > 0) |
---|
649 | { |
---|
650 | rtems_rfs_block_map_close (fs, &map); |
---|
651 | return rc; |
---|
652 | } |
---|
653 | |
---|
654 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
---|
655 | if (rc > 0) |
---|
656 | { |
---|
657 | rtems_rfs_block_map_close (fs, &map); |
---|
658 | return rc; |
---|
659 | } |
---|
660 | |
---|
661 | /* |
---|
662 | * Look for an empty entry and if this is the last block that is the end of |
---|
663 | * the directory. |
---|
664 | */ |
---|
665 | while (empty) |
---|
666 | { |
---|
667 | uint8_t* entry; |
---|
668 | int offset; |
---|
669 | |
---|
670 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, true); |
---|
671 | if (rc > 0) |
---|
672 | break; |
---|
673 | |
---|
674 | entry = rtems_rfs_buffer_data (&buffer); |
---|
675 | offset = 0; |
---|
676 | |
---|
677 | while (offset < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
---|
678 | { |
---|
679 | rtems_rfs_ino eino; |
---|
680 | int elength; |
---|
681 | |
---|
682 | elength = rtems_rfs_dir_entry_length (entry); |
---|
683 | eino = rtems_rfs_dir_entry_ino (entry); |
---|
684 | |
---|
685 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
---|
686 | break; |
---|
687 | |
---|
688 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
---|
689 | { |
---|
690 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_EMPTY)) |
---|
691 | printf ("rtems-rfs: dir-empty: " \ |
---|
692 | "bad length or ino for ino %lu: %u/%ld @ %04x\n", |
---|
693 | rtems_rfs_inode_ino (dir), elength, eino, offset); |
---|
694 | rc = EIO; |
---|
695 | break; |
---|
696 | } |
---|
697 | |
---|
698 | /* |
---|
699 | * Ignore the current (.) and parent (..) entries. Anything else means |
---|
700 | * the directory is not empty. |
---|
701 | */ |
---|
702 | if (((elength != (RTEMS_RFS_DIR_ENTRY_SIZE + 1)) || |
---|
703 | (entry[RTEMS_RFS_DIR_ENTRY_SIZE] != '.')) && |
---|
704 | ((elength != (RTEMS_RFS_DIR_ENTRY_SIZE + 2)) || |
---|
705 | (entry[RTEMS_RFS_DIR_ENTRY_SIZE] != '.') || |
---|
706 | (entry[RTEMS_RFS_DIR_ENTRY_SIZE + 1] != '.'))) |
---|
707 | { |
---|
708 | empty = false; |
---|
709 | break; |
---|
710 | } |
---|
711 | |
---|
712 | entry += elength; |
---|
713 | offset += elength; |
---|
714 | } |
---|
715 | |
---|
716 | if (empty) |
---|
717 | { |
---|
718 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
---|
719 | if (rc > 0) |
---|
720 | { |
---|
721 | if (rc == ENXIO) |
---|
722 | rc = 0; |
---|
723 | break; |
---|
724 | } |
---|
725 | } |
---|
726 | } |
---|
727 | |
---|
728 | if ((rc == 0) && !empty) |
---|
729 | rc = ENOTEMPTY; |
---|
730 | |
---|
731 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
732 | rtems_rfs_block_map_close (fs, &map); |
---|
733 | return rc; |
---|
734 | } |
---|