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 | #if HAVE_CONFIG_H |
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29 | #include "config.h" |
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30 | #endif |
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31 | |
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32 | #include <inttypes.h> |
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33 | |
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34 | #if SIZEOF_OFF_T == 8 |
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35 | #define PRIdoff_t PRIo64 |
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36 | #elif SIZEOF_OFF_T == 4 |
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37 | #define PRIdoff_t PRIo32 |
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38 | #else |
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39 | #error "unsupported size of off_t" |
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40 | #endif |
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41 | |
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42 | #include <rtems/rfs/rtems-rfs-block.h> |
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43 | #include <rtems/rfs/rtems-rfs-buffer.h> |
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44 | #include <rtems/rfs/rtems-rfs-file-system.h> |
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45 | #include <rtems/rfs/rtems-rfs-trace.h> |
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46 | #include <rtems/rfs/rtems-rfs-dir.h> |
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47 | #include <rtems/rfs/rtems-rfs-dir-hash.h> |
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48 | |
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49 | /** |
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50 | * Validate the directory entry data. |
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51 | */ |
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52 | #define rtems_rfs_dir_entry_valid(_f, _l, _i) \ |
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53 | (((_l) <= RTEMS_RFS_DIR_ENTRY_SIZE) || ((_l) >= rtems_rfs_fs_max_name (_f)) \ |
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54 | || (_i < RTEMS_RFS_ROOT_INO) || (_i > rtems_rfs_fs_inodes (_f))) |
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55 | |
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56 | int |
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57 | rtems_rfs_dir_lookup_ino (rtems_rfs_file_system* fs, |
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58 | rtems_rfs_inode_handle* inode, |
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59 | const char* name, |
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60 | int length, |
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61 | rtems_rfs_ino* ino, |
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62 | uint32_t* offset) |
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63 | { |
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64 | rtems_rfs_block_map map; |
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65 | rtems_rfs_buffer_handle entries; |
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66 | int rc; |
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67 | |
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68 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
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69 | { |
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70 | int c; |
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71 | printf ("rtems-rfs: dir-lookup-ino: lookup ino: root=%" PRId32 ", path=", |
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72 | inode->ino); |
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73 | for (c = 0; c < length; c++) |
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74 | printf ("%c", name[c]); |
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75 | printf (", len=%d\n", length); |
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76 | } |
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77 | |
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78 | *ino = RTEMS_RFS_EMPTY_INO; |
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79 | *offset = 0; |
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80 | |
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81 | rc = rtems_rfs_block_map_open (fs, inode, &map); |
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82 | if (rc > 0) |
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83 | { |
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84 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
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85 | printf ("rtems-rfs: dir-lookup-ino: map open failed for ino %" PRIu32 ": %d: %s", |
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86 | rtems_rfs_inode_ino (inode), rc, strerror (rc)); |
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87 | return rc; |
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88 | } |
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89 | |
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90 | rc = rtems_rfs_buffer_handle_open (fs, &entries); |
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91 | if (rc > 0) |
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92 | { |
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93 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
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94 | printf ("rtems-rfs: dir-lookup-ino: handle open failed for ino %" PRIu32 ": %d: %s", |
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95 | rtems_rfs_inode_ino (inode), rc, strerror (rc)); |
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96 | rtems_rfs_block_map_close (fs, &map); |
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97 | return rc; |
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98 | } |
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99 | else |
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100 | { |
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101 | rtems_rfs_block_no block; |
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102 | uint32_t hash; |
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103 | |
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104 | /* |
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105 | * Calculate the hash of the look up string. |
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106 | */ |
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107 | hash = rtems_rfs_dir_hash (name, length); |
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108 | |
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109 | /* |
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110 | * Locate the first block. The map points to the start after open so just |
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111 | * seek 0. If an error the block will be 0. |
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112 | */ |
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113 | rc = rtems_rfs_block_map_seek (fs, &map, 0, &block); |
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114 | if (rc > 0) |
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115 | { |
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116 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
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117 | printf ("rtems-rfs: dir-lookup-ino: block map find failed: %d: %s\n", |
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118 | rc, strerror (rc)); |
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119 | if (rc == ENXIO) |
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120 | rc = ENOENT; |
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121 | rtems_rfs_buffer_handle_close (fs, &entries); |
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122 | rtems_rfs_block_map_close (fs, &map); |
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123 | return rc; |
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124 | } |
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125 | |
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126 | while ((rc == 0) && block) |
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127 | { |
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128 | uint8_t* entry; |
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129 | |
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130 | rc = rtems_rfs_buffer_handle_request (fs, &entries, block, true); |
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131 | if (rc > 0) |
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132 | { |
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133 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
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134 | printf ("rtems-rfs: dir-lookup-ino: block read, ino=%" PRIu32 " block=%" PRId32 ": %d: %s\n", |
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135 | rtems_rfs_inode_ino (inode), block, rc, strerror (rc)); |
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136 | break; |
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137 | } |
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138 | |
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139 | /* |
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140 | * Search the block to see if the name matches. A hash of 0xffff or 0x0 |
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141 | * means the entry is empty. |
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142 | */ |
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143 | |
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144 | entry = rtems_rfs_buffer_data (&entries); |
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145 | |
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146 | map.bpos.boff = 0; |
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147 | |
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148 | while (map.bpos.boff < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
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149 | { |
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150 | uint32_t ehash; |
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151 | int elength; |
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152 | |
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153 | ehash = rtems_rfs_dir_entry_hash (entry); |
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154 | elength = rtems_rfs_dir_entry_length (entry); |
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155 | *ino = rtems_rfs_dir_entry_ino (entry); |
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156 | |
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157 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
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158 | break; |
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159 | |
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160 | if (rtems_rfs_dir_entry_valid (fs, elength, *ino)) |
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161 | { |
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162 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
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163 | printf ("rtems-rfs: dir-lookup-ino: " |
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164 | "bad length or ino for ino %" PRIu32 ": %u/%" PRId32 " @ %04" PRIx32 "\n", |
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165 | rtems_rfs_inode_ino (inode), elength, *ino, map.bpos.boff); |
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166 | rc = EIO; |
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167 | break; |
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168 | } |
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169 | |
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170 | if (ehash == hash) |
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171 | { |
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172 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO_CHECK)) |
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173 | printf ("rtems-rfs: dir-lookup-ino: " |
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174 | "checking entry for ino %" PRId32 ": off=%04" PRIx32 " length:%d ino:%" PRId32 "\n", |
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175 | rtems_rfs_inode_ino (inode), map.bpos.boff, |
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176 | elength, rtems_rfs_dir_entry_ino (entry)); |
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177 | |
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178 | if (memcmp (entry + RTEMS_RFS_DIR_ENTRY_SIZE, name, length) == 0) |
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179 | { |
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180 | *offset = rtems_rfs_block_map_pos (fs, &map); |
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181 | |
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182 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO_FOUND)) |
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183 | printf ("rtems-rfs: dir-lookup-ino: " |
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184 | "entry found in ino %" PRIu32 ", ino=%" PRIu32 " offset=%" PRIu32 "\n", |
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185 | rtems_rfs_inode_ino (inode), *ino, *offset); |
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186 | |
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187 | rtems_rfs_buffer_handle_close (fs, &entries); |
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188 | rtems_rfs_block_map_close (fs, &map); |
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189 | return 0; |
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190 | } |
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191 | } |
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192 | |
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193 | map.bpos.boff += elength; |
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194 | entry += elength; |
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195 | } |
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196 | |
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197 | if (rc == 0) |
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198 | { |
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199 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
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200 | if ((rc > 0) && (rc != ENXIO)) |
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201 | { |
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202 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
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203 | printf ("rtems-rfs: dir-lookup-ino: " |
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204 | "block map next block failed in ino %" PRIu32 ": %d: %s\n", |
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205 | rtems_rfs_inode_ino (inode), rc, strerror (rc)); |
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206 | } |
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207 | if (rc == ENXIO) |
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208 | rc = ENOENT; |
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209 | } |
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210 | } |
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211 | |
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212 | if ((rc == 0) && (block == 0)) |
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213 | { |
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214 | rc = EIO; |
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215 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
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216 | printf ("rtems-rfs: dir-lookup-ino: block is 0 in ino %" PRIu32 ": %d: %s\n", |
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217 | rtems_rfs_inode_ino (inode), rc, strerror (rc)); |
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218 | } |
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219 | } |
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220 | |
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221 | rtems_rfs_buffer_handle_close (fs, &entries); |
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222 | rtems_rfs_block_map_close (fs, &map); |
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223 | return rc; |
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224 | } |
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225 | |
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226 | int |
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227 | rtems_rfs_dir_add_entry (rtems_rfs_file_system* fs, |
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228 | rtems_rfs_inode_handle* dir, |
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229 | const char* name, |
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230 | size_t length, |
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231 | rtems_rfs_ino ino) |
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232 | { |
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233 | rtems_rfs_block_map map; |
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234 | rtems_rfs_block_pos bpos; |
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235 | rtems_rfs_buffer_handle buffer; |
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236 | int rc; |
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237 | |
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238 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
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239 | { |
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240 | int c; |
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241 | printf ("rtems-rfs: dir-add-entry: dir=%" PRId32 ", name=", |
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242 | rtems_rfs_inode_ino (dir)); |
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243 | for (c = 0; c < length; c++) |
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244 | printf ("%c", name[c]); |
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245 | printf (", len=%zd\n", length); |
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246 | } |
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247 | |
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248 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
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249 | if (rc > 0) |
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250 | return rc; |
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251 | |
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252 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
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253 | if (rc > 0) |
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254 | { |
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255 | rtems_rfs_block_map_close (fs, &map); |
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256 | return rc; |
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257 | } |
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258 | |
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259 | /* |
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260 | * Search the map from the beginning to find any empty space. |
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261 | */ |
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262 | rtems_rfs_block_set_bpos_zero (&bpos); |
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263 | |
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264 | while (true) |
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265 | { |
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266 | rtems_rfs_block_no block; |
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267 | uint8_t* entry; |
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268 | int offset; |
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269 | bool read = true; |
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270 | |
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271 | /* |
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272 | * Locate the first block. If an error the block will be 0. If the map is |
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273 | * empty which happens when creating a directory and adding the first entry |
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274 | * the seek will return ENXIO. In this case we need to grow the directory. |
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275 | */ |
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276 | rc = rtems_rfs_block_map_find (fs, &map, &bpos, &block); |
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277 | if (rc > 0) |
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278 | { |
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279 | if (rc != ENXIO) |
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280 | { |
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281 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
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282 | printf ("rtems-rfs: dir-add-entry: " |
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283 | "block map find failed for ino %" PRIu32 ": %d: %s\n", |
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284 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
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285 | break; |
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286 | } |
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287 | |
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288 | /* |
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289 | * We have reached the end of the directory so add a block. |
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290 | */ |
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291 | rc = rtems_rfs_block_map_grow (fs, &map, 1, &block); |
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292 | if (rc > 0) |
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293 | { |
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294 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
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295 | printf ("rtems-rfs: dir-add-entry: " |
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296 | "block map grow failed for ino %" PRIu32 ": %d: %s\n", |
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297 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
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298 | break; |
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299 | } |
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300 | |
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301 | read = false; |
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302 | } |
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303 | |
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304 | bpos.bno++; |
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305 | |
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306 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, read); |
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307 | if (rc > 0) |
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308 | { |
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309 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
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310 | printf ("rtems-rfs: dir-add-entry: " |
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311 | "block buffer req failed for ino %" PRIu32 ": %d: %s\n", |
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312 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
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313 | break; |
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314 | } |
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315 | |
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316 | entry = rtems_rfs_buffer_data (&buffer); |
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317 | |
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318 | if (!read) |
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319 | memset (entry, 0xff, rtems_rfs_fs_block_size (fs)); |
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320 | |
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321 | offset = 0; |
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322 | |
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323 | while (offset < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
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324 | { |
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325 | rtems_rfs_ino eino; |
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326 | int elength; |
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327 | |
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328 | elength = rtems_rfs_dir_entry_length (entry); |
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329 | eino = rtems_rfs_dir_entry_ino (entry); |
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330 | |
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331 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
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332 | { |
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333 | if ((length + RTEMS_RFS_DIR_ENTRY_SIZE) < |
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334 | (rtems_rfs_fs_block_size (fs) - offset)) |
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335 | { |
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336 | uint32_t hash; |
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337 | hash = rtems_rfs_dir_hash (name, length); |
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338 | rtems_rfs_dir_set_entry_hash (entry, hash); |
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339 | rtems_rfs_dir_set_entry_ino (entry, ino); |
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340 | rtems_rfs_dir_set_entry_length (entry, |
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341 | RTEMS_RFS_DIR_ENTRY_SIZE + length); |
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342 | memcpy (entry + RTEMS_RFS_DIR_ENTRY_SIZE, name, length); |
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343 | rtems_rfs_buffer_mark_dirty (&buffer); |
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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 0; |
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347 | } |
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348 | |
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349 | break; |
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350 | } |
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351 | |
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352 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
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353 | { |
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354 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
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355 | printf ("rtems-rfs: dir-add-entry: " |
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356 | "bad length or ino for ino %" PRIu32 ": %u/%" PRId32 " @ %04x\n", |
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357 | rtems_rfs_inode_ino (dir), elength, eino, offset); |
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358 | rtems_rfs_buffer_handle_close (fs, &buffer); |
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359 | rtems_rfs_block_map_close (fs, &map); |
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360 | return EIO; |
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361 | } |
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362 | |
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363 | entry += elength; |
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364 | offset += elength; |
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365 | } |
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366 | } |
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367 | |
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368 | rtems_rfs_buffer_handle_close (fs, &buffer); |
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369 | rtems_rfs_block_map_close (fs, &map); |
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370 | return rc; |
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371 | } |
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372 | |
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373 | int |
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374 | rtems_rfs_dir_del_entry (rtems_rfs_file_system* fs, |
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375 | rtems_rfs_inode_handle* dir, |
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376 | rtems_rfs_ino ino, |
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377 | uint32_t offset) |
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378 | { |
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379 | rtems_rfs_block_map map; |
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380 | rtems_rfs_block_no block; |
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381 | rtems_rfs_buffer_handle buffer; |
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382 | bool search; |
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383 | int rc; |
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384 | |
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385 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
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386 | printf ("rtems-rfs: dir-del-entry: dir=%" PRId32 ", entry=%" PRId32 " offset=%" PRIu32 "\n", |
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387 | rtems_rfs_inode_ino (dir), ino, offset); |
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388 | |
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389 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
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390 | if (rc > 0) |
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391 | return rc; |
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392 | |
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393 | rc = rtems_rfs_block_map_seek (fs, &map, offset, &block); |
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394 | if (rc > 0) |
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395 | { |
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396 | if (rc == ENXIO) |
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397 | rc = ENOENT; |
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398 | rtems_rfs_block_map_close (fs, &map); |
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399 | return rc; |
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400 | } |
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401 | |
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402 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
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403 | if (rc > 0) |
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404 | { |
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405 | rtems_rfs_block_map_close (fs, &map); |
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406 | return rc; |
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407 | } |
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408 | |
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409 | /* |
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410 | * Only search if the offset is 0 else we are at that position. |
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411 | */ |
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412 | search = offset ? false : true; |
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413 | |
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414 | while (rc == 0) |
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415 | { |
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416 | uint8_t* entry; |
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417 | int offset; |
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418 | |
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419 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, true); |
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420 | if (rc > 0) |
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421 | { |
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422 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
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423 | printf ("rtems-rfs: dir-del-entry: " |
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424 | "block buffer req failed for ino %" PRIu32 ": %d: %s\n", |
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425 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
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426 | break; |
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427 | } |
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428 | |
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429 | entry = rtems_rfs_buffer_data (&buffer); |
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430 | offset = 0; |
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431 | |
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432 | while (offset < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
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433 | { |
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434 | rtems_rfs_ino eino; |
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435 | int elength; |
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436 | |
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437 | elength = rtems_rfs_dir_entry_length (entry); |
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438 | eino = rtems_rfs_dir_entry_ino (entry); |
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439 | |
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440 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
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441 | break; |
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442 | |
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443 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
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444 | { |
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445 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
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446 | printf ("rtems-rfs: dir-del-entry: " |
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447 | "bad length or ino for ino %" PRIu32 ": %u/%" PRId32 " @ %04x\n", |
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448 | rtems_rfs_inode_ino (dir), elength, eino, offset); |
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449 | rc = EIO; |
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450 | break; |
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451 | } |
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452 | |
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453 | if (ino == rtems_rfs_dir_entry_ino (entry)) |
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454 | { |
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455 | uint32_t remaining; |
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456 | remaining = rtems_rfs_fs_block_size (fs) - (offset + elength); |
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457 | memmove (entry, entry + elength, remaining); |
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458 | memset (entry + remaining, 0xff, elength); |
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459 | |
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460 | /* |
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461 | * If the remainder of the block is empty and this is the start of the |
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462 | * block and it is the last block in the map shrink the map. |
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463 | * |
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464 | * @note We could check again to see if the new end block in the map is |
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465 | * also empty. This way we could clean up an empty directory. |
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466 | */ |
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467 | elength = rtems_rfs_dir_entry_length (entry); |
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468 | |
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469 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
---|
470 | printf ("rtems-rfs: dir-del-entry: " |
---|
471 | "last block free for ino %" PRIu32 ": elength=%i offset=%d last=%s\n", |
---|
472 | ino, elength, offset, |
---|
473 | rtems_rfs_block_map_last (&map) ? "yes" : "no"); |
---|
474 | |
---|
475 | if ((elength == RTEMS_RFS_DIR_ENTRY_EMPTY) && |
---|
476 | (offset == 0) && rtems_rfs_block_map_last (&map)) |
---|
477 | { |
---|
478 | rc = rtems_rfs_block_map_shrink (fs, &map, 1); |
---|
479 | if (rc > 0) |
---|
480 | { |
---|
481 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
---|
482 | printf ("rtems-rfs: dir-del-entry: " |
---|
483 | "block map shrink failed for ino %" PRIu32 ": %d: %s\n", |
---|
484 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
---|
485 | } |
---|
486 | } |
---|
487 | |
---|
488 | rtems_rfs_buffer_mark_dirty (&buffer); |
---|
489 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
490 | rtems_rfs_block_map_close (fs, &map); |
---|
491 | return 0; |
---|
492 | } |
---|
493 | |
---|
494 | if (!search) |
---|
495 | { |
---|
496 | rc = EIO; |
---|
497 | break; |
---|
498 | } |
---|
499 | |
---|
500 | entry += elength; |
---|
501 | offset += elength; |
---|
502 | } |
---|
503 | |
---|
504 | if (rc == 0) |
---|
505 | { |
---|
506 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
---|
507 | if (rc == ENXIO) |
---|
508 | rc = ENOENT; |
---|
509 | } |
---|
510 | } |
---|
511 | |
---|
512 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
513 | rtems_rfs_block_map_close (fs, &map); |
---|
514 | return rc; |
---|
515 | } |
---|
516 | |
---|
517 | int |
---|
518 | rtems_rfs_dir_read (rtems_rfs_file_system* fs, |
---|
519 | rtems_rfs_inode_handle* dir, |
---|
520 | rtems_rfs_pos_rel offset, |
---|
521 | struct dirent* dirent, |
---|
522 | size_t* length) |
---|
523 | { |
---|
524 | rtems_rfs_block_map map; |
---|
525 | rtems_rfs_buffer_handle buffer; |
---|
526 | rtems_rfs_block_no block; |
---|
527 | int rc; |
---|
528 | |
---|
529 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
530 | printf ("rtems-rfs: dir-read: dir=%" PRId32 " offset=%" PRId64 "\n", |
---|
531 | rtems_rfs_inode_ino (dir), offset); |
---|
532 | |
---|
533 | *length = 0; |
---|
534 | |
---|
535 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
---|
536 | if (rc > 0) |
---|
537 | return rc; |
---|
538 | |
---|
539 | if (((rtems_rfs_fs_block_size (fs) - |
---|
540 | (offset % rtems_rfs_fs_block_size (fs))) <= RTEMS_RFS_DIR_ENTRY_SIZE)) |
---|
541 | offset = (((offset / rtems_rfs_fs_block_size (fs)) + 1) * |
---|
542 | rtems_rfs_fs_block_size (fs)); |
---|
543 | |
---|
544 | rc = rtems_rfs_block_map_seek (fs, &map, offset, &block); |
---|
545 | if (rc > 0) |
---|
546 | { |
---|
547 | if (rc == ENXIO) |
---|
548 | rc = ENOENT; |
---|
549 | rtems_rfs_block_map_close (fs, &map); |
---|
550 | return rc; |
---|
551 | } |
---|
552 | |
---|
553 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
---|
554 | if (rc > 0) |
---|
555 | { |
---|
556 | rtems_rfs_block_map_close (fs, &map); |
---|
557 | return rc; |
---|
558 | } |
---|
559 | |
---|
560 | /* |
---|
561 | * Look for an empty entry and if this is the last block that is the end of |
---|
562 | * the directory. |
---|
563 | */ |
---|
564 | while (rc == 0) |
---|
565 | { |
---|
566 | uint8_t* entry; |
---|
567 | rtems_rfs_ino eino; |
---|
568 | int elength; |
---|
569 | int remaining; |
---|
570 | |
---|
571 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, true); |
---|
572 | if (rc > 0) |
---|
573 | { |
---|
574 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
575 | rtems_rfs_block_map_close (fs, &map); |
---|
576 | return rc; |
---|
577 | } |
---|
578 | |
---|
579 | entry = rtems_rfs_buffer_data (&buffer); |
---|
580 | entry += map.bpos.boff; |
---|
581 | |
---|
582 | elength = rtems_rfs_dir_entry_length (entry); |
---|
583 | eino = rtems_rfs_dir_entry_ino (entry); |
---|
584 | |
---|
585 | if (elength != RTEMS_RFS_DIR_ENTRY_EMPTY) |
---|
586 | { |
---|
587 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
---|
588 | { |
---|
589 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
590 | printf ("rtems-rfs: dir-read: " |
---|
591 | "bad length or ino for ino %" PRIu32 ": %u/%" PRId32 " @ %04" PRIx32 "\n", |
---|
592 | rtems_rfs_inode_ino (dir), elength, eino, map.bpos.boff); |
---|
593 | rc = EIO; |
---|
594 | break; |
---|
595 | } |
---|
596 | |
---|
597 | memset (dirent, 0, sizeof (struct dirent)); |
---|
598 | dirent->d_off = offset; |
---|
599 | dirent->d_reclen = sizeof (struct dirent); |
---|
600 | |
---|
601 | *length += elength; |
---|
602 | |
---|
603 | remaining = rtems_rfs_fs_block_size (fs) - (map.bpos.boff + elength); |
---|
604 | |
---|
605 | if (remaining <= RTEMS_RFS_DIR_ENTRY_SIZE) |
---|
606 | *length += remaining; |
---|
607 | |
---|
608 | if (elength < RTEMS_RFS_DIR_ENTRY_SIZE) |
---|
609 | elength = 0; |
---|
610 | else |
---|
611 | elength -= RTEMS_RFS_DIR_ENTRY_SIZE; |
---|
612 | if (elength > NAME_MAX) |
---|
613 | elength = NAME_MAX; |
---|
614 | |
---|
615 | memcpy (dirent->d_name, entry + RTEMS_RFS_DIR_ENTRY_SIZE, elength); |
---|
616 | |
---|
617 | dirent->d_ino = rtems_rfs_dir_entry_ino (entry); |
---|
618 | dirent->d_namlen = elength; |
---|
619 | |
---|
620 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
621 | printf ("rtems-rfs: dir-read: found off:%" PRIdoff_t " ino:%ld name=%s\n", |
---|
622 | dirent->d_off, dirent->d_ino, dirent->d_name); |
---|
623 | break; |
---|
624 | } |
---|
625 | |
---|
626 | *length += rtems_rfs_fs_block_size (fs) - map.bpos.boff; |
---|
627 | |
---|
628 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
629 | printf ("rtems-rfs: dir-read: next block: off:%" PRId64 " length:%zd\n", |
---|
630 | offset, *length); |
---|
631 | |
---|
632 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
---|
633 | if (rc == ENXIO) |
---|
634 | rc = ENOENT; |
---|
635 | } |
---|
636 | |
---|
637 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
638 | rtems_rfs_block_map_close (fs, &map); |
---|
639 | return rc; |
---|
640 | } |
---|
641 | |
---|
642 | int |
---|
643 | rtems_rfs_dir_empty (rtems_rfs_file_system* fs, |
---|
644 | rtems_rfs_inode_handle* dir) |
---|
645 | { |
---|
646 | rtems_rfs_block_map map; |
---|
647 | rtems_rfs_buffer_handle buffer; |
---|
648 | rtems_rfs_block_no block; |
---|
649 | bool empty; |
---|
650 | int rc; |
---|
651 | |
---|
652 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
653 | printf ("rtems-rfs: dir-empty: dir=%" PRId32 "\n", rtems_rfs_inode_ino (dir)); |
---|
654 | |
---|
655 | empty = true; |
---|
656 | |
---|
657 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
---|
658 | if (rc > 0) |
---|
659 | return rc; |
---|
660 | |
---|
661 | rc = rtems_rfs_block_map_seek (fs, &map, 0, &block); |
---|
662 | if (rc > 0) |
---|
663 | { |
---|
664 | rtems_rfs_block_map_close (fs, &map); |
---|
665 | return rc; |
---|
666 | } |
---|
667 | |
---|
668 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
---|
669 | if (rc > 0) |
---|
670 | { |
---|
671 | rtems_rfs_block_map_close (fs, &map); |
---|
672 | return rc; |
---|
673 | } |
---|
674 | |
---|
675 | /* |
---|
676 | * Look for an empty entry and if this is the last block that is the end of |
---|
677 | * the directory. |
---|
678 | */ |
---|
679 | while (empty) |
---|
680 | { |
---|
681 | uint8_t* entry; |
---|
682 | int offset; |
---|
683 | |
---|
684 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, true); |
---|
685 | if (rc > 0) |
---|
686 | break; |
---|
687 | |
---|
688 | entry = rtems_rfs_buffer_data (&buffer); |
---|
689 | offset = 0; |
---|
690 | |
---|
691 | while (offset < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
---|
692 | { |
---|
693 | rtems_rfs_ino eino; |
---|
694 | int elength; |
---|
695 | |
---|
696 | elength = rtems_rfs_dir_entry_length (entry); |
---|
697 | eino = rtems_rfs_dir_entry_ino (entry); |
---|
698 | |
---|
699 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
---|
700 | break; |
---|
701 | |
---|
702 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
---|
703 | { |
---|
704 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_EMPTY)) |
---|
705 | printf ("rtems-rfs: dir-empty: " |
---|
706 | "bad length or ino for ino %" PRIu32 ": %u/%" PRIu32 " @ %04x\n", |
---|
707 | rtems_rfs_inode_ino (dir), elength, eino, offset); |
---|
708 | rc = EIO; |
---|
709 | break; |
---|
710 | } |
---|
711 | |
---|
712 | /* |
---|
713 | * Ignore the current (.) and parent (..) entries. Anything else means |
---|
714 | * the directory is not empty. |
---|
715 | */ |
---|
716 | if (((elength != (RTEMS_RFS_DIR_ENTRY_SIZE + 1)) || |
---|
717 | (entry[RTEMS_RFS_DIR_ENTRY_SIZE] != '.')) && |
---|
718 | ((elength != (RTEMS_RFS_DIR_ENTRY_SIZE + 2)) || |
---|
719 | (entry[RTEMS_RFS_DIR_ENTRY_SIZE] != '.') || |
---|
720 | (entry[RTEMS_RFS_DIR_ENTRY_SIZE + 1] != '.'))) |
---|
721 | { |
---|
722 | empty = false; |
---|
723 | break; |
---|
724 | } |
---|
725 | |
---|
726 | entry += elength; |
---|
727 | offset += elength; |
---|
728 | } |
---|
729 | |
---|
730 | if (empty) |
---|
731 | { |
---|
732 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
---|
733 | if (rc > 0) |
---|
734 | { |
---|
735 | if (rc == ENXIO) |
---|
736 | rc = 0; |
---|
737 | break; |
---|
738 | } |
---|
739 | } |
---|
740 | } |
---|
741 | |
---|
742 | if ((rc == 0) && !empty) |
---|
743 | rc = ENOTEMPTY; |
---|
744 | |
---|
745 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
746 | rtems_rfs_block_map_close (fs, &map); |
---|
747 | return rc; |
---|
748 | } |
---|