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annotate packages/redboot/current/src/fs/e2fs.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents f62680ef1804
children d2c90368aeef
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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 //==========================================================================
208
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
174
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): msalter
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44 // Contributors: msalter
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45 // Date: 2001-07-14
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46 // Purpose:
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47 // Description:
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48 //
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49 // This code is part of RedBoot (tm).
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50 //
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51 //####DESCRIPTIONEND####
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52 //
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53 //==========================================================================
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54
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55 #include <redboot.h>
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56 #include <fs/disk.h>
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57 #include <fs/e2fs.h>
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58
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59 #define DEBUG_E2FS 0
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60
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61 #if DEBUG_E2FS > 4
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62 static void dump_sb(struct e2fs_super_block *s);
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63 static void dump_inode(struct e2fs_inode *i);
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64 #endif
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65
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66 static void *e2fs_open(partition_t *p, const char *path);
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67 static int e2fs_read(void *fp, char *buf, cyg_uint32 nbytes);
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68
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69 // This structure is the only thing exported by this module.
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70 // These filesystem function pointers are attached to disk
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71 // partitions in the generic disk handling code.
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72 //
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73 fs_funs_t redboot_e2fs_funs = {
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74 e2fs_open,
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75 e2fs_read
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76 };
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77
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78 // A single block buffer to be shared carefully.
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79 static cyg_uint32 blockbuf[E2FS_MAX_BLOCK_SIZE/sizeof(cyg_uint32)];
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80
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81 #define __READ_BLOCK(n) \
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82 PARTITION_READ(e2fs->part, E2FS_BLOCK_TO_SECTOR(e2fs, (n)), \
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83 blockbuf, e2fs->blocksize/SECTOR_SIZE)
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84
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85 // Get a group descriptor. Returns non-zero for success.
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86 //
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87 static int
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88 e2fs_get_gdesc(e2fs_desc_t *e2fs, cyg_uint32 group_nr, e2fs_group_t *gdesc)
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89 {
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90 cyg_uint32 sec_nr;
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91
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92 if (group_nr < e2fs->gdesc_first ||
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93 group_nr >= (e2fs->gdesc_first + E2FS_GDESC_CACHE_SIZE)) {
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94
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95 // cache miss
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96 sec_nr = E2FS_BLOCK_TO_SECTOR(e2fs, e2fs->gdesc_block);
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97 sec_nr += (group_nr / E2FS_GDESC_PER_SECTOR);
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98
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99 #if DEBUG_E2FS > 2
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100 diag_printf("%s: group[%d] cache miss, sec_nr[%d]\n",
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101 __FUNCTION__, group_nr, sec_nr);
174
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102 #endif
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103 if (!PARTITION_READ(e2fs->part, sec_nr, (cyg_uint32 *)e2fs->gdesc_cache,
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104 sizeof(e2fs->gdesc_cache)/SECTOR_SIZE))
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105 return 0;
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106 }
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107 *gdesc = e2fs->gdesc_cache[group_nr - e2fs->gdesc_first];
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108
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109 return 1;
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110 }
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111
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112 // Read the requested inode from disk. Return non-zero if successful
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113 //
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114 static int
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115 e2fs_get_inode(e2fs_desc_t *e2fs, int ino, e2fs_inode_t *ip)
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116 {
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117 cyg_uint32 offset, sec_nr, buf[SECTOR_SIZE/sizeof(cyg_uint32)];
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118 e2fs_group_t gdesc;
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119
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120 // get descriptor for group which this inode belongs to
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121 if (!e2fs_get_gdesc(e2fs, (ino - 1) / e2fs->inodes_per_group, &gdesc))
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122 return 0;
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123 if (gdesc.inode_table == 0)
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124 return 0;
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125
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126 // byte offset within group inode table
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127 offset = ((ino - 1) % e2fs->inodes_per_group) * sizeof(struct e2fs_inode);
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128
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129 // figure out which sector holds the inode
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130 sec_nr = E2FS_BLOCK_TO_SECTOR(e2fs, SWAB_LE32(gdesc.inode_table));
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131 sec_nr += offset / SECTOR_SIZE;
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132
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133 // and the offset within that sector.
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134 offset %= SECTOR_SIZE;
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135
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136 #if DEBUG_E2FS > 0
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137 diag_printf("%s: ino[%d], sec_nr[%d] offset[%d]\n", __FUNCTION__,
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138 ino, sec_nr, offset);
174
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139 #endif
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140
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141 if (!PARTITION_READ(e2fs->part, sec_nr, buf, 1))
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142 return 0;
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143
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144 *ip = *(e2fs_inode_t *)((char *)buf + offset);
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145
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146 #if DEBUG_E2FS > 0
182
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147 diag_printf("%s: inode size[%d]\n", __FUNCTION__, SWAB_LE32(ip->size));
174
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148 #endif
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149
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150 return 1;
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151 }
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152
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153 // Mount an e2fs filesystem on the given partition.
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154 // Return 0 if successful.
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155 //
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156 static int
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157 e2fs_mount(partition_t *part, e2fs_desc_t *e2fs)
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158 {
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159 int sb_block = 1;
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160 cyg_uint32 sb_buf[E2FS_MIN_BLOCK_SIZE/sizeof(cyg_uint32)];
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161 struct e2fs_super_block *sb = (struct e2fs_super_block *)sb_buf;
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162
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163 e2fs->part = part;
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164
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165 if (!PARTITION_READ(part, sb_block*(E2FS_MIN_BLOCK_SIZE/SECTOR_SIZE),
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166 (cyg_uint32 *)sb, E2FS_MIN_BLOCK_SIZE/SECTOR_SIZE))
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167 return -1;
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168
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169 if (SWAB_LE16(sb->magic) != E2FS_SUPER_MAGIC) {
182
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170 diag_printf("ext2_mount: bad magic 0x%x\n", SWAB_LE16(sb->magic));
174
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171 return -1;
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172 }
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173
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174 // save some stuff for easy access
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175 e2fs->blocksize = E2FS_BLOCK_SIZE(sb);
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176 e2fs->nr_ind_blocks = (e2fs)->blocksize / sizeof(cyg_uint32);
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177 e2fs->nr_dind_blocks = e2fs->nr_ind_blocks * ((e2fs)->blocksize / sizeof(cyg_uint32));
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178 e2fs->nr_tind_blocks = e2fs->nr_dind_blocks * ((e2fs)->blocksize / sizeof(cyg_uint32));
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179 e2fs->blocks_per_group = SWAB_LE32(sb->blocks_per_group);
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180 e2fs->ngroups = (SWAB_LE32(sb->blocks_count) + e2fs->blocks_per_group - 1) /
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181 e2fs->blocks_per_group;
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182 e2fs->inodes_per_group = SWAB_LE32(sb->inodes_per_group);
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183
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184 // Find the group descriptors which follow superblock
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185 e2fs->gdesc_block = ((sb_block * E2FS_MIN_BLOCK_SIZE) / e2fs->blocksize) + 1;
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186 e2fs->gdesc_first = 0; // cache group 0 initially
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187
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188 if (!PARTITION_READ(part, E2FS_BLOCK_TO_SECTOR(e2fs,e2fs->gdesc_block),
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189 (cyg_uint32 *)e2fs->gdesc_cache, 1))
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190 return -1;
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191
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192 #if DEBUG_E2FS > 1
182
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193 diag_printf("E2FS superblock:\n");
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194 diag_printf(" [%d] inodes\n", SWAB_LE32(sb->inodes_count));
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195 diag_printf(" [%d] blocks\n", SWAB_LE32(sb->blocks_count));
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196 diag_printf(" [%d] blocksize\n", e2fs->blocksize);
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197 diag_printf(" [%d] blocks per group\n", e2fs->blocks_per_group);
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198 diag_printf(" [%d] ngroups\n", e2fs->ngroups);
174
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199 #endif
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200
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201 #if DEBUG_E2FS > 4
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202 dump_sb(sb);
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203 #endif
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204
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205 return 0;
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206 }
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207
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208 // Convert a block index into inode data into a block_nr.
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209 // If successful, store block number in pblknr and return non-zero.
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210 //
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211 // NB: This needs some block/sector caching to be speedier. But
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212 // that takes memory and speed is not too bad now for files
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213 // small enough to avoid double and triple indirection.
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214 //
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215 static int
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216 e2fs_inode_block(e2fs_desc_t *e2fs, e2fs_inode_t *inode,
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217 cyg_uint32 bindex, cyg_uint32 *pblknr)
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218 {
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219 if (bindex < E2FS_NR_DIR_BLOCKS) {
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220 *pblknr = SWAB_LE32(inode->block[bindex]);
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221 return 1;
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222 }
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223 bindex -= E2FS_NR_DIR_BLOCKS;
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224
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225 if (bindex < e2fs->nr_ind_blocks) {
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226 // Indirect block
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227 if (!__READ_BLOCK(SWAB_LE32(inode->block[E2FS_IND_BLOCK])))
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228 return 0;
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229 *pblknr = blockbuf[bindex];
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230 return 1;
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231 }
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232 bindex -= e2fs->nr_ind_blocks;
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233
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234 if (bindex < e2fs->nr_dind_blocks) {
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235 // Double indirect block
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236 if (!__READ_BLOCK(SWAB_LE32(inode->block[E2FS_DIND_BLOCK])))
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237 return 0;
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238 if (!__READ_BLOCK(SWAB_LE32(blockbuf[bindex / e2fs->nr_ind_blocks])))
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239 return 0;
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240 *pblknr = blockbuf[bindex % e2fs->nr_ind_blocks];
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241 return 1;
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242 }
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243 bindex -= e2fs->nr_dind_blocks;
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244
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245 // Triple indirect block
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246 if (!__READ_BLOCK(SWAB_LE32(inode->block[E2FS_TIND_BLOCK])))
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247 return 0;
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248 if (!__READ_BLOCK(SWAB_LE32(blockbuf[bindex / e2fs->nr_dind_blocks])))
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249 return 0;
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250 bindex %= e2fs->nr_dind_blocks;
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251 if (!__READ_BLOCK(SWAB_LE32(blockbuf[bindex / e2fs->nr_ind_blocks])))
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252 return 0;
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253 *pblknr = blockbuf[bindex % e2fs->nr_ind_blocks];
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254 return 1;
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255 }
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256
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257
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258 // search a single directory block in memory looking for an
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259 // entry with the given name. Return pointer to entry if
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260 // found, NULL if not.
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261 //
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262 static e2fs_dir_entry_t *
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263 search_dir_block(e2fs_desc_t *e2fs, cyg_uint32 *blkbuf,
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264 const char *name, int namelen)
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265 {
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266 e2fs_dir_entry_t *dir;
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267 cyg_uint16 reclen, len;
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268 cyg_uint32 offset;
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269
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270 offset = 0;
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271 while (offset < e2fs->blocksize) {
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272 dir = (e2fs_dir_entry_t *)((char *)blkbuf + offset);
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273 reclen = SWAB_LE16(dir->reclen);
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274 offset += reclen;
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275 len = dir->namelen;
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276
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277 // terminate on anything which doesn't make sense
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278 if (reclen < 8 || (len + 8) > reclen || offset > (e2fs->blocksize + 1))
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279 return NULL;
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280
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281 if (dir->inode && len == namelen && !strncmp(dir->name, name, len))
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282 return dir;
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283 }
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284 return NULL;
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285 }
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286
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287
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288 // Look in the given directory for an entry with the given name.
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289 // If found, return a pointer to that entry. Return NULL if not
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290 // found.
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291 //
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292 static e2fs_dir_entry_t *
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293 e2fs_dir_lookup(e2fs_desc_t *e2fs, cyg_uint32 dir_ino,
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294 const char *name, int namelen)
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295 {
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296 e2fs_inode_t inode;
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297 e2fs_dir_entry_t *dir;
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298 cyg_uint32 nblocks, last_block_size, i, block_nr, nbytes;
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299
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300 #if DEBUG_E2FS > 0
182
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301 diag_printf("%s: looking for %s [%d] in ino[%d]\n",
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302 __FUNCTION__, name, namelen, dir_ino);
174
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303 #endif
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304
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305 if (!e2fs_get_inode(e2fs, dir_ino, &inode)) {
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306 #if DEBUG_E2FS > 0
182
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307 diag_printf("%s: e2fs_get_inode [%d] failed\n", __FUNCTION__, dir_ino);
174
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308 #endif
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309 return NULL;
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310 }
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311
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312 nbytes = SWAB_LE32(inode.size);
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313 nblocks = (nbytes + e2fs->blocksize - 1) / e2fs->blocksize;
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314
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315 last_block_size = nbytes % e2fs->blocksize;
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316 if (last_block_size == 0)
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317 last_block_size = e2fs->blocksize;
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318
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319 for (i = 0; i < nblocks; i++) {
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320 if (!e2fs_inode_block(e2fs, &inode, i, &block_nr))
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321 return NULL;
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322
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323 if (block_nr) {
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324 if (!__READ_BLOCK(block_nr))
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325 return NULL;
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326 } else
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327 memset(blockbuf, 0, e2fs->blocksize);
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328
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329 dir = search_dir_block(e2fs, blockbuf, name, namelen);
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330
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331 if (dir != NULL)
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332 return dir;
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333 }
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334 return NULL;
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335 }
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336
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337 typedef struct ino_info {
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338 cyg_uint32 ino;
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339 cyg_uint32 parent_ino;
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340 cyg_uint8 filetype;
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341 } ino_info_t;
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342
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343 static int e2fs_inode_lookup(e2fs_desc_t *e2fs, cyg_uint32 dir_ino,
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344 const char *pathname, ino_info_t *info);
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345
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346 // Starting from the given directory, find the inode number, filetype, and
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347 // parent inode for the file pointed to by the given symbolic link inode.
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348 // If successful, fills out ino_info_t and return true.
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349 //
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350 static int
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351 e2fs_follow_symlink(e2fs_desc_t *e2fs, cyg_uint32 dir_ino, cyg_uint32 sym_ino, ino_info_t *info)
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352 {
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353 #define MAX_SYMLINK_NAME 255
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354 char symlink[MAX_SYMLINK_NAME+1];
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355 int pathlen;
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356 cyg_uint32 block_nr;
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357 e2fs_inode_t inode;
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358
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359 if (!e2fs_get_inode(e2fs, sym_ino, &inode)) {
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360 #if DEBUG_E2FS > 0
182
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361 diag_printf("%s: e2fs_get_inode [%d] failed\n", __FUNCTION__, *ino);
174
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362 #endif
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363 return 0;
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364 }
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365
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366 pathlen = SWAB_LE32(inode.size);
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367 if (pathlen > MAX_SYMLINK_NAME)
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368 return 0;
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369
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370 if (inode.blocks) {
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371 if (!e2fs_inode_block(e2fs, &inode, 0, &block_nr))
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372 return 0;
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373 if (block_nr) {
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374 if (!PARTITION_READ(e2fs->part, E2FS_BLOCK_TO_SECTOR(e2fs, block_nr),
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375 blockbuf, e2fs->blocksize/SECTOR_SIZE))
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376 return 0;
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377 memcpy(symlink, blockbuf, pathlen);
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378 } else
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379 return 0;
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380 } else {
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381 // small enough path to fit in inode struct
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382 memcpy(symlink, (char *)&inode.block[0], pathlen);
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383 }
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384 symlink[pathlen] = 0;
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385
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386 return e2fs_inode_lookup(e2fs, dir_ino, symlink, info);
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387 }
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388
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389
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390 // Starting from the given directory, find the inode number, filetype, and
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391 // parent inode for the given file pathname.
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392 // If successful, fills out ino_info_t and return true.
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393 //
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394 static int
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395 e2fs_inode_lookup(e2fs_desc_t *e2fs, cyg_uint32 dir_ino, const char *pathname, ino_info_t *info)
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396 {
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397 int len, pathlen;
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398 const char *p;
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399 e2fs_dir_entry_t *dir = NULL;
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400
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401 if (!pathname || (pathlen = strlen(pathname)) == 0)
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402 return 0;
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403
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404 if (*pathname == '/') {
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405 if (--pathlen == 0) {
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406 info->ino = info->parent_ino = E2FS_ROOT_INO;
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407 info->filetype = E2FS_FTYPE_DIR;
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408 return 1;
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409 }
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410 ++pathname;
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411 dir_ino = E2FS_ROOT_INO;
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412 }
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413
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414 while (pathlen) {
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415 // find next delimiter in path.
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416 for (p = pathname, len = 0; len < pathlen; len++, p++) {
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417 // skip delimiter if found.
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418 if (*p == '/') {
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419 ++p;
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420 --pathlen;
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421 break;
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422 }
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423 }
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424 dir = e2fs_dir_lookup(e2fs, dir_ino, pathname, len);
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425 if (dir == NULL)
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426 return 0;
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diff changeset
427
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jlarmour
parents:
diff changeset
428 pathlen -= len;
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jlarmour
parents:
diff changeset
429 pathname = p;
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jlarmour
parents:
diff changeset
430
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jlarmour
parents:
diff changeset
431 switch (dir->filetype) {
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jlarmour
parents:
diff changeset
432 case E2FS_FTYPE_SYMLINK:
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jlarmour
parents:
diff changeset
433 // follow the symbolic link (this will cause recursion)
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jlarmour
parents:
diff changeset
434 if (!e2fs_follow_symlink(e2fs, dir_ino, SWAB_LE32(dir->inode), info))
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jlarmour
parents:
diff changeset
435 return 0;
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jlarmour
parents:
diff changeset
436 if (pathlen == 0)
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jlarmour
parents:
diff changeset
437 return 1;
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jlarmour
parents:
diff changeset
438 // must be a dir if we want to continue
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jlarmour
parents:
diff changeset
439 if (info->filetype != E2FS_FTYPE_DIR)
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jlarmour
parents:
diff changeset
440 return 0;
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jlarmour
parents:
diff changeset
441 dir_ino = info->ino;
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jlarmour
parents:
diff changeset
442 break;
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jlarmour
parents:
diff changeset
443
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jlarmour
parents:
diff changeset
444 case E2FS_FTYPE_DIR:
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jlarmour
parents:
diff changeset
445 if (pathlen)
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jlarmour
parents:
diff changeset
446 dir_ino = SWAB_LE32(dir->inode);
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jlarmour
parents:
diff changeset
447 break;
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jlarmour
parents:
diff changeset
448
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jlarmour
parents:
diff changeset
449 case E2FS_FTYPE_REG_FILE:
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jlarmour
parents:
diff changeset
450 if (pathlen)
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jlarmour
parents:
diff changeset
451 return 0; // regular file embedded in middle of path
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jlarmour
parents:
diff changeset
452 break;
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jlarmour
parents:
diff changeset
453
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jlarmour
parents:
diff changeset
454 case E2FS_FTYPE_UNKNOWN:
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jlarmour
parents:
diff changeset
455 case E2FS_FTYPE_CHRDEV:
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jlarmour
parents:
diff changeset
456 case E2FS_FTYPE_BLKDEV:
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jlarmour
parents:
diff changeset
457 case E2FS_FTYPE_FIFO:
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jlarmour
parents:
diff changeset
458 case E2FS_FTYPE_SOCK:
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jlarmour
parents:
diff changeset
459 default:
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jlarmour
parents:
diff changeset
460 return 0;
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jlarmour
parents:
diff changeset
461 }
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jlarmour
parents:
diff changeset
462 }
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jlarmour
parents:
diff changeset
463 info->ino = SWAB_LE32(dir->inode);
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jlarmour
parents:
diff changeset
464 info->parent_ino = dir_ino;
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jlarmour
parents:
diff changeset
465 info->filetype = dir->filetype;
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jlarmour
parents:
diff changeset
466 return 1;
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jlarmour
parents:
diff changeset
467 }
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jlarmour
parents:
diff changeset
468
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jlarmour
parents:
diff changeset
469 struct read_info {
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jlarmour
parents:
diff changeset
470 e2fs_desc_t e2fs_desc;
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jlarmour
parents:
diff changeset
471 e2fs_inode_t inode;
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jlarmour
parents:
diff changeset
472 cyg_uint32 fsize;
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jlarmour
parents:
diff changeset
473 cyg_uint32 fpos;
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jlarmour
parents:
diff changeset
474 };
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jlarmour
parents:
diff changeset
475
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jlarmour
parents:
diff changeset
476 static void *
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jlarmour
parents:
diff changeset
477 e2fs_open(partition_t *p, const char *filepath)
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jlarmour
parents:
diff changeset
478 {
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jlarmour
parents:
diff changeset
479 static struct read_info rinfo;
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jlarmour
parents:
diff changeset
480 ino_info_t ino_info;
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jlarmour
parents:
diff changeset
481
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jlarmour
parents:
diff changeset
482 // mount partition
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jlarmour
parents:
diff changeset
483 if (e2fs_mount(p, &rinfo.e2fs_desc) != 0) {
182
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jlarmour
parents: 174
diff changeset
484 diag_printf("mount failed.\n");
174
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jlarmour
parents:
diff changeset
485 return NULL;
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jlarmour
parents:
diff changeset
486 }
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jlarmour
parents:
diff changeset
487
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jlarmour
parents:
diff changeset
488 // find file inode
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jlarmour
parents:
diff changeset
489 if (!e2fs_inode_lookup(&rinfo.e2fs_desc, E2FS_ROOT_INO, filepath, &ino_info)) {
182
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parents: 174
diff changeset
490 diag_printf("%s: e2fs_inode_lookup failed\n", __FUNCTION__);
174
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jlarmour
parents:
diff changeset
491 return NULL;
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jlarmour
parents:
diff changeset
492 }
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jlarmour
parents:
diff changeset
493
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jlarmour
parents:
diff changeset
494 // read inode
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jlarmour
parents:
diff changeset
495 if (!e2fs_get_inode(&rinfo.e2fs_desc, ino_info.ino, &rinfo.inode)) {
182
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parents: 174
diff changeset
496 diag_printf("%s: e2fs_get_inode failed for ino[%d]\n", __FUNCTION__, ino_info.ino);
174
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jlarmour
parents:
diff changeset
497 return NULL;
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jlarmour
parents:
diff changeset
498 }
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jlarmour
parents:
diff changeset
499
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jlarmour
parents:
diff changeset
500 rinfo.fsize = SWAB_LE32(rinfo.inode.size);
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jlarmour
parents:
diff changeset
501 rinfo.fpos = 0;
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jlarmour
parents:
diff changeset
502
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jlarmour
parents:
diff changeset
503 return &rinfo;
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jlarmour
parents:
diff changeset
504 }
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jlarmour
parents:
diff changeset
505
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jlarmour
parents:
diff changeset
506 static int
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jlarmour
parents:
diff changeset
507 e2fs_read(void *fp, char *buf, cyg_uint32 nbytes)
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jlarmour
parents:
diff changeset
508 {
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jlarmour
parents:
diff changeset
509 struct read_info *info = fp;
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jlarmour
parents:
diff changeset
510 e2fs_desc_t *e2fs;
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jlarmour
parents:
diff changeset
511 cyg_uint32 nread = 0, rem, block_nr, bindex, to_read;
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jlarmour
parents:
diff changeset
512
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jlarmour
parents:
diff changeset
513 if ((info->fpos + nbytes) > info->fsize)
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jlarmour
parents:
diff changeset
514 nbytes = info->fsize - info->fpos;
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jlarmour
parents:
diff changeset
515
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jlarmour
parents:
diff changeset
516 e2fs = &info->e2fs_desc;
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jlarmour
parents:
diff changeset
517
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jlarmour
parents:
diff changeset
518 // see if we need to copy leftover data from last read call
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jlarmour
parents:
diff changeset
519 rem = e2fs->blocksize - (info->fpos % e2fs->blocksize);
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jlarmour
parents:
diff changeset
520 if (rem != e2fs->blocksize) {
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jlarmour
parents:
diff changeset
521 char *p = (char *)blockbuf + e2fs->blocksize - rem;
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jlarmour
parents:
diff changeset
522
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jlarmour
parents:
diff changeset
523 if (rem > nbytes)
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jlarmour
parents:
diff changeset
524 rem = nbytes;
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jlarmour
parents:
diff changeset
525
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jlarmour
parents:
diff changeset
526 memcpy(buf, p, rem);
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jlarmour
parents:
diff changeset
527
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jlarmour
parents:
diff changeset
528 nread += rem;
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jlarmour
parents:
diff changeset
529 buf += rem;
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jlarmour
parents:
diff changeset
530 info->fpos += rem;
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jlarmour
parents:
diff changeset
531 }
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jlarmour
parents:
diff changeset
532
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jlarmour
parents:
diff changeset
533 // now loop through blocks if we're not done
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jlarmour
parents:
diff changeset
534 bindex = info->fpos / e2fs->blocksize;
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jlarmour
parents:
diff changeset
535 while (nread < nbytes) {
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jlarmour
parents:
diff changeset
536 if (!e2fs_inode_block(e2fs, &info->inode, bindex, &block_nr))
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jlarmour
parents:
diff changeset
537 return -1;
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jlarmour
parents:
diff changeset
538
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jlarmour
parents:
diff changeset
539 if (block_nr) {
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jlarmour
parents:
diff changeset
540 if (!PARTITION_READ(e2fs->part, E2FS_BLOCK_TO_SECTOR(e2fs, block_nr),
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jlarmour
parents:
diff changeset
541 blockbuf, e2fs->blocksize/SECTOR_SIZE))
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jlarmour
parents:
diff changeset
542 return 0;
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jlarmour
parents:
diff changeset
543 } else
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jlarmour
parents:
diff changeset
544 memset(blockbuf, 0, e2fs->blocksize);
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jlarmour
parents:
diff changeset
545
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jlarmour
parents:
diff changeset
546 to_read = nbytes - nread;
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jlarmour
parents:
diff changeset
547 if (to_read > e2fs->blocksize)
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jlarmour
parents:
diff changeset
548 to_read = e2fs->blocksize;
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jlarmour
parents:
diff changeset
549
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jlarmour
parents:
diff changeset
550 memcpy(buf, blockbuf, to_read);
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jlarmour
parents:
diff changeset
551
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jlarmour
parents:
diff changeset
552 nread += to_read;
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jlarmour
parents:
diff changeset
553 buf += to_read;
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jlarmour
parents:
diff changeset
554 info->fpos += to_read;
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jlarmour
parents:
diff changeset
555 ++bindex;
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jlarmour
parents:
diff changeset
556 }
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jlarmour
parents:
diff changeset
557
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jlarmour
parents:
diff changeset
558 return nread;
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jlarmour
parents:
diff changeset
559 }
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jlarmour
parents:
diff changeset
560
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jlarmour
parents:
diff changeset
561 #if DEBUG_E2FS > 4
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jlarmour
parents:
diff changeset
562 static void dump_sb(struct e2fs_super_block *s)
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jlarmour
parents:
diff changeset
563 {
182
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jlarmour
parents: 174
diff changeset
564 diag_printf("inode_count: %d\n", SWAB_LE32(s->inodes_count));
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jlarmour
parents: 174
diff changeset
565 diag_printf("blocks_count: %d\n", SWAB_LE32(s->blocks_count));
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jlarmour
parents: 174
diff changeset
566 diag_printf("r_blocks_count: %d\n", SWAB_LE32(s->r_blocks_count));
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jlarmour
parents: 174
diff changeset
567 diag_printf("free_blocks_count: %d\n", SWAB_LE32(s->free_blocks_count));
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jlarmour
parents: 174
diff changeset
568 diag_printf("free_inodes_count: %d\n", SWAB_LE32(s->free_inodes_count));
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jlarmour
parents: 174
diff changeset
569 diag_printf("first_data_block: %d\n", SWAB_LE32(s->first_data_block));
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jlarmour
parents: 174
diff changeset
570 diag_printf("log_block_size: %d\n", SWAB_LE32(s->log_block_size));
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jlarmour
parents: 174
diff changeset
571 diag_printf("log_frag_size: %d\n", SWAB_LE32(s->log_frag_size));
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jlarmour
parents: 174
diff changeset
572 diag_printf("blocks_per_group: %d\n", SWAB_LE32(s->blocks_per_group));
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573 diag_printf("frags_per_group: %d\n", SWAB_LE32(s->frags_per_group));
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574 diag_printf("inodes_per_group: %d\n", SWAB_LE32(s->inodes_per_group));
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575 diag_printf("mnt_count: %d\n", SWAB_LE16(s->mnt_count));
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576 diag_printf("max_mnt_count: %d\n", SWAB_LE16(s->max_mnt_count));
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577 diag_printf("magic: %d\n", SWAB_LE16(s->magic));
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578 diag_printf("state: %d\n", SWAB_LE16(s->state));
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579 diag_printf("errors: %d\n", SWAB_LE16(s->errors));
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580 diag_printf("minor_rev_level: %d\n", SWAB_LE16(s->minor_rev_level));
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581 diag_printf("lastcheck: %d\n", SWAB_LE32(s->lastcheck));
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582 diag_printf("checkinterval: %d\n", SWAB_LE32(s->checkinterval));
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583 diag_printf("creator_os: %d\n", SWAB_LE32(s->creator_os));
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584 diag_printf("rev_level: %d\n", SWAB_LE32(s->rev_level));
174
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585 }
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586
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587 static void dump_inode(struct e2fs_inode *i)
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588 {
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589 int j, n;
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590
182
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591 diag_printf("mode: %o\n", SWAB_LE16(i->mode));
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592 diag_printf("uid: %o\n", SWAB_LE16(i->uid));
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593 diag_printf("size: %d\n", SWAB_LE32(i->size));
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594 diag_printf("gid: %o\n", SWAB_LE16(i->gid));
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595 diag_printf("links: %d\n", SWAB_LE16(i->links_count));
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596 diag_printf("blocks: %d\n", SWAB_LE32(i->blocks));
174
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597
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598 n = i->blocks;
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599 if (n > E2FS_N_BLOCKS)
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600 n = E2FS_N_BLOCKS;
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601
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602 for (j = 0; j < n; j++)
182
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603 diag_printf(" block: %d\n", SWAB_LE32(i->block[j]));
174
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604 }
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605 #endif
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606
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607