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annotate packages/redboot/current/src/fs/e2fs.c @ 174:38892b97b685

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Merge from eCos master repository on 2001-07-28-00:17:32-BST
author jlarmour
date Sun, 29 Jul 2001 02:00:07 +0000
parents
children f62680ef1804
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1 //==========================================================================
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2 //
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3 // e2fs.c
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4 //
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5 // RedBoot support for second extended filesystem
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000, 2001 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): msalter
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35 // Contributors: msalter
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36 // Date: 2001-07-14
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37 // Purpose:
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38 // Description:
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39 //
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40 // This code is part of RedBoot (tm).
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41 //
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42 //####DESCRIPTIONEND####
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43 //
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44 //==========================================================================
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45
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46 #include <redboot.h>
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47 #include <fs/disk.h>
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48 #include <fs/e2fs.h>
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49
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50 #define DEBUG_E2FS 0
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51
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52 #if DEBUG_E2FS > 4
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53 static void dump_sb(struct e2fs_super_block *s);
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54 static void dump_inode(struct e2fs_inode *i);
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55 #endif
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56
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57 static void *e2fs_open(partition_t *p, const char *path);
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58 static int e2fs_read(void *fp, char *buf, cyg_uint32 nbytes);
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59
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60 // This structure is the only thing exported by this module.
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61 // These filesystem function pointers are attached to disk
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62 // partitions in the generic disk handling code.
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63 //
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64 fs_funs_t redboot_e2fs_funs = {
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65 e2fs_open,
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66 e2fs_read
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67 };
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68
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69 // A single block buffer to be shared carefully.
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70 static cyg_uint32 blockbuf[E2FS_MAX_BLOCK_SIZE/sizeof(cyg_uint32)];
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71
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72 #define __READ_BLOCK(n) \
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73 PARTITION_READ(e2fs->part, E2FS_BLOCK_TO_SECTOR(e2fs, (n)), \
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74 blockbuf, e2fs->blocksize/SECTOR_SIZE)
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75
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76 // Get a group descriptor. Returns non-zero for success.
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77 //
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78 static int
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79 e2fs_get_gdesc(e2fs_desc_t *e2fs, cyg_uint32 group_nr, e2fs_group_t *gdesc)
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80 {
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81 cyg_uint32 sec_nr;
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82
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83 if (group_nr < e2fs->gdesc_first ||
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84 group_nr >= (e2fs->gdesc_first + E2FS_GDESC_CACHE_SIZE)) {
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85
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86 // cache miss
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87 sec_nr = E2FS_BLOCK_TO_SECTOR(e2fs, e2fs->gdesc_block);
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88 sec_nr += (group_nr / E2FS_GDESC_PER_SECTOR);
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89
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90 #if DEBUG_E2FS > 2
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91 printf("%s: group[%d] cache miss, sec_nr[%d]\n",
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92 __FUNCTION__, group_nr, sec_nr);
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93 #endif
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94 if (!PARTITION_READ(e2fs->part, sec_nr, (cyg_uint32 *)e2fs->gdesc_cache,
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95 sizeof(e2fs->gdesc_cache)/SECTOR_SIZE))
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96 return 0;
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97 }
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98 *gdesc = e2fs->gdesc_cache[group_nr - e2fs->gdesc_first];
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99
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100 return 1;
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101 }
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102
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103 // Read the requested inode from disk. Return non-zero if successful
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104 //
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105 static int
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106 e2fs_get_inode(e2fs_desc_t *e2fs, int ino, e2fs_inode_t *ip)
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107 {
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108 cyg_uint32 offset, sec_nr, buf[SECTOR_SIZE/sizeof(cyg_uint32)];
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109 e2fs_group_t gdesc;
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110
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111 // get descriptor for group which this inode belongs to
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112 if (!e2fs_get_gdesc(e2fs, (ino - 1) / e2fs->inodes_per_group, &gdesc))
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113 return 0;
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114 if (gdesc.inode_table == 0)
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115 return 0;
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116
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117 // byte offset within group inode table
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118 offset = ((ino - 1) % e2fs->inodes_per_group) * sizeof(struct e2fs_inode);
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119
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120 // figure out which sector holds the inode
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121 sec_nr = E2FS_BLOCK_TO_SECTOR(e2fs, SWAB_LE32(gdesc.inode_table));
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122 sec_nr += offset / SECTOR_SIZE;
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123
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124 // and the offset within that sector.
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125 offset %= SECTOR_SIZE;
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126
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127 #if DEBUG_E2FS > 0
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128 printf("%s: ino[%d], sec_nr[%d] offset[%d]\n", __FUNCTION__,
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129 ino, sec_nr, offset);
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130 #endif
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131
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132 if (!PARTITION_READ(e2fs->part, sec_nr, buf, 1))
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133 return 0;
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134
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135 *ip = *(e2fs_inode_t *)((char *)buf + offset);
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136
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137 #if DEBUG_E2FS > 0
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138 printf("%s: inode size[%d]\n", __FUNCTION__, SWAB_LE32(ip->size));
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139 #endif
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140
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141 return 1;
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142 }
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143
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144 // Mount an e2fs filesystem on the given partition.
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145 // Return 0 if successful.
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146 //
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147 static int
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148 e2fs_mount(partition_t *part, e2fs_desc_t *e2fs)
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149 {
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150 int sb_block = 1;
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151 cyg_uint32 sb_buf[E2FS_MIN_BLOCK_SIZE/sizeof(cyg_uint32)];
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152 struct e2fs_super_block *sb = (struct e2fs_super_block *)sb_buf;
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153
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154 e2fs->part = part;
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155
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156 if (!PARTITION_READ(part, sb_block*(E2FS_MIN_BLOCK_SIZE/SECTOR_SIZE),
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157 (cyg_uint32 *)sb, E2FS_MIN_BLOCK_SIZE/SECTOR_SIZE))
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158 return -1;
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159
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160 if (SWAB_LE16(sb->magic) != E2FS_SUPER_MAGIC) {
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161 printf("ext2_mount: bad magic 0x%x\n", SWAB_LE16(sb->magic));
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162 return -1;
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163 }
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164
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165 // save some stuff for easy access
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166 e2fs->blocksize = E2FS_BLOCK_SIZE(sb);
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167 e2fs->nr_ind_blocks = (e2fs)->blocksize / sizeof(cyg_uint32);
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168 e2fs->nr_dind_blocks = e2fs->nr_ind_blocks * ((e2fs)->blocksize / sizeof(cyg_uint32));
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169 e2fs->nr_tind_blocks = e2fs->nr_dind_blocks * ((e2fs)->blocksize / sizeof(cyg_uint32));
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170 e2fs->blocks_per_group = SWAB_LE32(sb->blocks_per_group);
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171 e2fs->ngroups = (SWAB_LE32(sb->blocks_count) + e2fs->blocks_per_group - 1) /
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172 e2fs->blocks_per_group;
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173 e2fs->inodes_per_group = SWAB_LE32(sb->inodes_per_group);
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174
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175 // Find the group descriptors which follow superblock
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176 e2fs->gdesc_block = ((sb_block * E2FS_MIN_BLOCK_SIZE) / e2fs->blocksize) + 1;
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177 e2fs->gdesc_first = 0; // cache group 0 initially
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178
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179 if (!PARTITION_READ(part, E2FS_BLOCK_TO_SECTOR(e2fs,e2fs->gdesc_block),
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180 (cyg_uint32 *)e2fs->gdesc_cache, 1))
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181 return -1;
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182
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183 #if DEBUG_E2FS > 1
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184 printf("E2FS superblock:\n");
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185 printf(" [%d] inodes\n", SWAB_LE32(sb->inodes_count));
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186 printf(" [%d] blocks\n", SWAB_LE32(sb->blocks_count));
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187 printf(" [%d] blocksize\n", e2fs->blocksize);
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188 printf(" [%d] blocks per group\n", e2fs->blocks_per_group);
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189 printf(" [%d] ngroups\n", e2fs->ngroups);
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190 #endif
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191
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192 #if DEBUG_E2FS > 4
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193 dump_sb(sb);
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194 #endif
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195
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196 return 0;
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197 }
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198
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199 // Convert a block index into inode data into a block_nr.
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200 // If successful, store block number in pblknr and return non-zero.
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201 //
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202 // NB: This needs some block/sector caching to be speedier. But
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203 // that takes memory and speed is not too bad now for files
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204 // small enough to avoid double and triple indirection.
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205 //
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206 static int
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207 e2fs_inode_block(e2fs_desc_t *e2fs, e2fs_inode_t *inode,
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208 cyg_uint32 bindex, cyg_uint32 *pblknr)
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209 {
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210 if (bindex < E2FS_NR_DIR_BLOCKS) {
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211 *pblknr = SWAB_LE32(inode->block[bindex]);
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212 return 1;
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213 }
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214 bindex -= E2FS_NR_DIR_BLOCKS;
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215
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216 if (bindex < e2fs->nr_ind_blocks) {
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217 // Indirect block
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218 if (!__READ_BLOCK(SWAB_LE32(inode->block[E2FS_IND_BLOCK])))
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219 return 0;
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220 *pblknr = blockbuf[bindex];
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221 return 1;
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222 }
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223 bindex -= e2fs->nr_ind_blocks;
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224
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225 if (bindex < e2fs->nr_dind_blocks) {
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226 // Double indirect block
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227 if (!__READ_BLOCK(SWAB_LE32(inode->block[E2FS_DIND_BLOCK])))
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228 return 0;
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229 if (!__READ_BLOCK(SWAB_LE32(blockbuf[bindex / e2fs->nr_ind_blocks])))
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230 return 0;
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231 *pblknr = blockbuf[bindex % e2fs->nr_ind_blocks];
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232 return 1;
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233 }
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234 bindex -= e2fs->nr_dind_blocks;
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235
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236 // Triple indirect block
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237 if (!__READ_BLOCK(SWAB_LE32(inode->block[E2FS_TIND_BLOCK])))
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238 return 0;
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239 if (!__READ_BLOCK(SWAB_LE32(blockbuf[bindex / e2fs->nr_dind_blocks])))
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240 return 0;
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241 bindex %= e2fs->nr_dind_blocks;
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242 if (!__READ_BLOCK(SWAB_LE32(blockbuf[bindex / e2fs->nr_ind_blocks])))
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243 return 0;
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244 *pblknr = blockbuf[bindex % e2fs->nr_ind_blocks];
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245 return 1;
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246 }
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247
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248
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249 // search a single directory block in memory looking for an
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250 // entry with the given name. Return pointer to entry if
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251 // found, NULL if not.
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252 //
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253 static e2fs_dir_entry_t *
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254 search_dir_block(e2fs_desc_t *e2fs, cyg_uint32 *blkbuf,
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255 const char *name, int namelen)
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256 {
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257 e2fs_dir_entry_t *dir;
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258 cyg_uint16 reclen, len;
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259 cyg_uint32 offset;
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260
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261 offset = 0;
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262 while (offset < e2fs->blocksize) {
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263 dir = (e2fs_dir_entry_t *)((char *)blkbuf + offset);
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264 reclen = SWAB_LE16(dir->reclen);
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265 offset += reclen;
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266 len = dir->namelen;
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267
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268 // terminate on anything which doesn't make sense
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269 if (reclen < 8 || (len + 8) > reclen || offset > (e2fs->blocksize + 1))
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270 return NULL;
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271
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272 if (dir->inode && len == namelen && !strncmp(dir->name, name, len))
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273 return dir;
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274 }
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275 return NULL;
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276 }
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277
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278
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279 // Look in the given directory for an entry with the given name.
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280 // If found, return a pointer to that entry. Return NULL if not
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281 // found.
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282 //
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283 static e2fs_dir_entry_t *
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284 e2fs_dir_lookup(e2fs_desc_t *e2fs, cyg_uint32 dir_ino,
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285 const char *name, int namelen)
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286 {
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287 e2fs_inode_t inode;
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288 e2fs_dir_entry_t *dir;
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289 cyg_uint32 nblocks, last_block_size, i, block_nr, nbytes;
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290
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291 #if DEBUG_E2FS > 0
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292 printf("%s: looking for %s [%d] in ino[%d]\n",
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293 __FUNCTION__, name, namelen, dir_ino);
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294 #endif
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295
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296 if (!e2fs_get_inode(e2fs, dir_ino, &inode)) {
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297 #if DEBUG_E2FS > 0
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298 printf("%s: e2fs_get_inode [%d] failed\n", __FUNCTION__, dir_ino);
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299 #endif
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300 return NULL;
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301 }
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302
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303 nbytes = SWAB_LE32(inode.size);
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304 nblocks = (nbytes + e2fs->blocksize - 1) / e2fs->blocksize;
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305
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306 last_block_size = nbytes % e2fs->blocksize;
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307 if (last_block_size == 0)
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308 last_block_size = e2fs->blocksize;
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309
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310 for (i = 0; i < nblocks; i++) {
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311 if (!e2fs_inode_block(e2fs, &inode, i, &block_nr))
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312 return NULL;
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313
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314 if (block_nr) {
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315 if (!__READ_BLOCK(block_nr))
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316 return NULL;
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317 } else
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318 memset(blockbuf, 0, e2fs->blocksize);
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319
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320 dir = search_dir_block(e2fs, blockbuf, name, namelen);
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321
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322 if (dir != NULL)
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323 return dir;
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324 }
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325 return NULL;
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326 }
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327
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328 typedef struct ino_info {
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329 cyg_uint32 ino;
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330 cyg_uint32 parent_ino;
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331 cyg_uint8 filetype;
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332 } ino_info_t;
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333
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334 static int e2fs_inode_lookup(e2fs_desc_t *e2fs, cyg_uint32 dir_ino,
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335 const char *pathname, ino_info_t *info);
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336
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337 // Starting from the given directory, find the inode number, filetype, and
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338 // parent inode for the file pointed to by the given symbolic link inode.
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339 // If successful, fills out ino_info_t and return true.
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340 //
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341 static int
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342 e2fs_follow_symlink(e2fs_desc_t *e2fs, cyg_uint32 dir_ino, cyg_uint32 sym_ino, ino_info_t *info)
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343 {
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344 #define MAX_SYMLINK_NAME 255
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345 char symlink[MAX_SYMLINK_NAME+1];
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346 int pathlen;
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347 cyg_uint32 block_nr;
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348 e2fs_inode_t inode;
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349
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350 if (!e2fs_get_inode(e2fs, sym_ino, &inode)) {
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351 #if DEBUG_E2FS > 0
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352 printf("%s: e2fs_get_inode [%d] failed\n", __FUNCTION__, *ino);
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353 #endif
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354 return 0;
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355 }
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356
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357 pathlen = SWAB_LE32(inode.size);
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358 if (pathlen > MAX_SYMLINK_NAME)
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359 return 0;
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360
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361 if (inode.blocks) {
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362 if (!e2fs_inode_block(e2fs, &inode, 0, &block_nr))
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363 return 0;
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364 if (block_nr) {
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365 if (!PARTITION_READ(e2fs->part, E2FS_BLOCK_TO_SECTOR(e2fs, block_nr),
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366 blockbuf, e2fs->blocksize/SECTOR_SIZE))
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367 return 0;
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368 memcpy(symlink, blockbuf, pathlen);
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369 } else
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370 return 0;
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371 } else {
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372 // small enough path to fit in inode struct
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373 memcpy(symlink, (char *)&inode.block[0], pathlen);
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374 }
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375 symlink[pathlen] = 0;
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376
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377 return e2fs_inode_lookup(e2fs, dir_ino, symlink, info);
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378 }
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379
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380
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381 // Starting from the given directory, find the inode number, filetype, and
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382 // parent inode for the given file pathname.
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383 // If successful, fills out ino_info_t and return true.
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384 //
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385 static int
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386 e2fs_inode_lookup(e2fs_desc_t *e2fs, cyg_uint32 dir_ino, const char *pathname, ino_info_t *info)
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387 {
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388 int len, pathlen;
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389 const char *p;
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390 e2fs_dir_entry_t *dir = NULL;
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391
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392 if (!pathname || (pathlen = strlen(pathname)) == 0)
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393 return 0;
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394
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395 if (*pathname == '/') {
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396 if (--pathlen == 0) {
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397 info->ino = info->parent_ino = E2FS_ROOT_INO;
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398 info->filetype = E2FS_FTYPE_DIR;
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399 return 1;
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400 }
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401 ++pathname;
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402 dir_ino = E2FS_ROOT_INO;
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403 }
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404
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405 while (pathlen) {
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406 // find next delimiter in path.
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407 for (p = pathname, len = 0; len < pathlen; len++, p++) {
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408 // skip delimiter if found.
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409 if (*p == '/') {
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410 ++p;
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411 --pathlen;
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412 break;
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413 }
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414 }
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415 dir = e2fs_dir_lookup(e2fs, dir_ino, pathname, len);
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416 if (dir == NULL)
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417 return 0;
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418
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419 pathlen -= len;
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420 pathname = p;
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diff changeset
421
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422 switch (dir->filetype) {
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423 case E2FS_FTYPE_SYMLINK:
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424 // follow the symbolic link (this will cause recursion)
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425 if (!e2fs_follow_symlink(e2fs, dir_ino, SWAB_LE32(dir->inode), info))
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426 return 0;
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427 if (pathlen == 0)
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428 return 1;
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429 // must be a dir if we want to continue
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430 if (info->filetype != E2FS_FTYPE_DIR)
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431 return 0;
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diff changeset
432 dir_ino = info->ino;
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jlarmour
parents:
diff changeset
433 break;
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jlarmour
parents:
diff changeset
434
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jlarmour
parents:
diff changeset
435 case E2FS_FTYPE_DIR:
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jlarmour
parents:
diff changeset
436 if (pathlen)
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jlarmour
parents:
diff changeset
437 dir_ino = SWAB_LE32(dir->inode);
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jlarmour
parents:
diff changeset
438 break;
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jlarmour
parents:
diff changeset
439
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jlarmour
parents:
diff changeset
440 case E2FS_FTYPE_REG_FILE:
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jlarmour
parents:
diff changeset
441 if (pathlen)
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jlarmour
parents:
diff changeset
442 return 0; // regular file embedded in middle of path
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jlarmour
parents:
diff changeset
443 break;
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jlarmour
parents:
diff changeset
444
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jlarmour
parents:
diff changeset
445 case E2FS_FTYPE_UNKNOWN:
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jlarmour
parents:
diff changeset
446 case E2FS_FTYPE_CHRDEV:
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jlarmour
parents:
diff changeset
447 case E2FS_FTYPE_BLKDEV:
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jlarmour
parents:
diff changeset
448 case E2FS_FTYPE_FIFO:
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jlarmour
parents:
diff changeset
449 case E2FS_FTYPE_SOCK:
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jlarmour
parents:
diff changeset
450 default:
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jlarmour
parents:
diff changeset
451 return 0;
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jlarmour
parents:
diff changeset
452 }
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jlarmour
parents:
diff changeset
453 }
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jlarmour
parents:
diff changeset
454 info->ino = SWAB_LE32(dir->inode);
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jlarmour
parents:
diff changeset
455 info->parent_ino = dir_ino;
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jlarmour
parents:
diff changeset
456 info->filetype = dir->filetype;
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jlarmour
parents:
diff changeset
457 return 1;
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jlarmour
parents:
diff changeset
458 }
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jlarmour
parents:
diff changeset
459
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jlarmour
parents:
diff changeset
460 struct read_info {
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jlarmour
parents:
diff changeset
461 e2fs_desc_t e2fs_desc;
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jlarmour
parents:
diff changeset
462 e2fs_inode_t inode;
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jlarmour
parents:
diff changeset
463 cyg_uint32 fsize;
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jlarmour
parents:
diff changeset
464 cyg_uint32 fpos;
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jlarmour
parents:
diff changeset
465 };
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jlarmour
parents:
diff changeset
466
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jlarmour
parents:
diff changeset
467 static void *
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jlarmour
parents:
diff changeset
468 e2fs_open(partition_t *p, const char *filepath)
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jlarmour
parents:
diff changeset
469 {
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jlarmour
parents:
diff changeset
470 static struct read_info rinfo;
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jlarmour
parents:
diff changeset
471 ino_info_t ino_info;
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jlarmour
parents:
diff changeset
472
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jlarmour
parents:
diff changeset
473 // mount partition
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jlarmour
parents:
diff changeset
474 if (e2fs_mount(p, &rinfo.e2fs_desc) != 0) {
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jlarmour
parents:
diff changeset
475 printf("mount failed.\n");
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jlarmour
parents:
diff changeset
476 return NULL;
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jlarmour
parents:
diff changeset
477 }
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jlarmour
parents:
diff changeset
478
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
479 // find file inode
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jlarmour
parents:
diff changeset
480 if (!e2fs_inode_lookup(&rinfo.e2fs_desc, E2FS_ROOT_INO, filepath, &ino_info)) {
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
481 printf("%s: e2fs_inode_lookup failed\n", __FUNCTION__);
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jlarmour
parents:
diff changeset
482 return NULL;
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jlarmour
parents:
diff changeset
483 }
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jlarmour
parents:
diff changeset
484
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
485 // read inode
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jlarmour
parents:
diff changeset
486 if (!e2fs_get_inode(&rinfo.e2fs_desc, ino_info.ino, &rinfo.inode)) {
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jlarmour
parents:
diff changeset
487 printf("%s: e2fs_get_inode failed for ino[%d]\n", __FUNCTION__, ino_info.ino);
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jlarmour
parents:
diff changeset
488 return NULL;
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jlarmour
parents:
diff changeset
489 }
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jlarmour
parents:
diff changeset
490
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jlarmour
parents:
diff changeset
491 rinfo.fsize = SWAB_LE32(rinfo.inode.size);
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jlarmour
parents:
diff changeset
492 rinfo.fpos = 0;
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jlarmour
parents:
diff changeset
493
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jlarmour
parents:
diff changeset
494 return &rinfo;
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jlarmour
parents:
diff changeset
495 }
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jlarmour
parents:
diff changeset
496
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jlarmour
parents:
diff changeset
497 static int
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jlarmour
parents:
diff changeset
498 e2fs_read(void *fp, char *buf, cyg_uint32 nbytes)
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jlarmour
parents:
diff changeset
499 {
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jlarmour
parents:
diff changeset
500 struct read_info *info = fp;
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jlarmour
parents:
diff changeset
501 e2fs_desc_t *e2fs;
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jlarmour
parents:
diff changeset
502 cyg_uint32 nread = 0, rem, block_nr, bindex, to_read;
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jlarmour
parents:
diff changeset
503
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jlarmour
parents:
diff changeset
504 if ((info->fpos + nbytes) > info->fsize)
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jlarmour
parents:
diff changeset
505 nbytes = info->fsize - info->fpos;
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jlarmour
parents:
diff changeset
506
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
507 e2fs = &info->e2fs_desc;
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jlarmour
parents:
diff changeset
508
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
509 // see if we need to copy leftover data from last read call
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jlarmour
parents:
diff changeset
510 rem = e2fs->blocksize - (info->fpos % e2fs->blocksize);
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jlarmour
parents:
diff changeset
511 if (rem != e2fs->blocksize) {
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jlarmour
parents:
diff changeset
512 char *p = (char *)blockbuf + e2fs->blocksize - rem;
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
513
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
514 if (rem > nbytes)
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jlarmour
parents:
diff changeset
515 rem = nbytes;
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
516
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
517 memcpy(buf, p, rem);
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
518
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
519 nread += rem;
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jlarmour
parents:
diff changeset
520 buf += rem;
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jlarmour
parents:
diff changeset
521 info->fpos += rem;
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
522 }
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jlarmour
parents:
diff changeset
523
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
524 // now loop through blocks if we're not done
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
525 bindex = info->fpos / e2fs->blocksize;
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
526 while (nread < nbytes) {
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
527 if (!e2fs_inode_block(e2fs, &info->inode, bindex, &block_nr))
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jlarmour
parents:
diff changeset
528 return -1;
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
529
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
530 if (block_nr) {
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
531 if (!PARTITION_READ(e2fs->part, E2FS_BLOCK_TO_SECTOR(e2fs, block_nr),
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
532 blockbuf, e2fs->blocksize/SECTOR_SIZE))
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
533 return 0;
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
534 } else
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
535 memset(blockbuf, 0, e2fs->blocksize);
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
536
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
537 to_read = nbytes - nread;
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
538 if (to_read > e2fs->blocksize)
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
539 to_read = e2fs->blocksize;
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
540
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
541 memcpy(buf, blockbuf, to_read);
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
542
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
543 nread += to_read;
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
544 buf += to_read;
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
545 info->fpos += to_read;
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
546 ++bindex;
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
547 }
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
548
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
549 return nread;
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
550 }
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
551
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
552 #if DEBUG_E2FS > 4
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jlarmour
parents:
diff changeset
553 static void dump_sb(struct e2fs_super_block *s)
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
554 {
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
555 printf("inode_count: %d\n", SWAB_LE32(s->inodes_count));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
556 printf("blocks_count: %d\n", SWAB_LE32(s->blocks_count));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
557 printf("r_blocks_count: %d\n", SWAB_LE32(s->r_blocks_count));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
558 printf("free_blocks_count: %d\n", SWAB_LE32(s->free_blocks_count));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
559 printf("free_inodes_count: %d\n", SWAB_LE32(s->free_inodes_count));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
560 printf("first_data_block: %d\n", SWAB_LE32(s->first_data_block));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
561 printf("log_block_size: %d\n", SWAB_LE32(s->log_block_size));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
562 printf("log_frag_size: %d\n", SWAB_LE32(s->log_frag_size));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
563 printf("blocks_per_group: %d\n", SWAB_LE32(s->blocks_per_group));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
564 printf("frags_per_group: %d\n", SWAB_LE32(s->frags_per_group));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
565 printf("inodes_per_group: %d\n", SWAB_LE32(s->inodes_per_group));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
566 printf("mnt_count: %d\n", SWAB_LE16(s->mnt_count));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
567 printf("max_mnt_count: %d\n", SWAB_LE16(s->max_mnt_count));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
568 printf("magic: %d\n", SWAB_LE16(s->magic));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
569 printf("state: %d\n", SWAB_LE16(s->state));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
570 printf("errors: %d\n", SWAB_LE16(s->errors));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
571 printf("minor_rev_level: %d\n", SWAB_LE16(s->minor_rev_level));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
572 printf("lastcheck: %d\n", SWAB_LE32(s->lastcheck));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
573 printf("checkinterval: %d\n", SWAB_LE32(s->checkinterval));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
574 printf("creator_os: %d\n", SWAB_LE32(s->creator_os));
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents:
diff changeset
575 printf("rev_level: %d\n", SWAB_LE32(s->rev_level));
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576 }
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577
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578 static void dump_inode(struct e2fs_inode *i)
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579 {
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580 int j, n;
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581
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582 printf("mode: %o\n", SWAB_LE16(i->mode));
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583 printf("uid: %o\n", SWAB_LE16(i->uid));
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584 printf("size: %d\n", SWAB_LE32(i->size));
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585 printf("gid: %o\n", SWAB_LE16(i->gid));
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586 printf("links: %d\n", SWAB_LE16(i->links_count));
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587 printf("blocks: %d\n", SWAB_LE32(i->blocks));
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588
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589 n = i->blocks;
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590 if (n > E2FS_N_BLOCKS)
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591 n = E2FS_N_BLOCKS;
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592
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593 for (j = 0; j < n; j++)
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594 printf(" block: %d\n", SWAB_LE32(i->block[j]));
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595 }
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596 #endif
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597
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598