1 | /* |
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2 | * GRUB -- GRand Unified Bootloader |
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3 | * Copyright (C) 2006 Free Software Foundation, Inc. |
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4 | * |
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5 | * This program is free software; you can redistribute it and/or modify |
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6 | * it under the terms of the GNU General Public License as published by |
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7 | * the Free Software Foundation; either version 2 of the License, or |
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8 | * (at your option) any later version. |
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9 | * |
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10 | * This program is distributed in the hope that it will be useful, |
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 | * GNU General Public License for more details. |
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14 | * |
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15 | * You should have received a copy of the GNU General Public License |
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16 | * along with this program; if not, write to the Free Software |
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17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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18 | */ |
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19 | /* |
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20 | * Copyright 2006 Sun Microsystems, Inc. All rights reserved. |
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21 | * Use is subject to license terms. |
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22 | */ |
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23 | |
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24 | /* From Solaris usr/src/stand/lib/fs/ufs/ufsops.c */ |
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25 | |
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26 | #include <fsimage_grub.h> |
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27 | |
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28 | #include "ufs.h" |
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29 | |
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30 | /* These are the pools of buffers, etc. */ |
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31 | |
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32 | #define SUPERBLOCK ((struct fs *)(FSYS_BUF + 0x2000)) |
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33 | #define INODE ((struct icommon *)(FSYS_BUF + 0x1000)) |
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34 | #define DIRENT (FSYS_BUF + 0x4000) |
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35 | #define INDIRBLK1 ((grub_daddr32_t *)(FSYS_BUF + 0x4000)) /* 2+ indir blk */ |
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36 | #define INDIRBLK0 ((grub_daddr32_t *)(FSYS_BUF+ 0x6000)) /* 1st indirect blk */ |
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37 | |
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38 | #define indirblk0 (*fsig_int1(ffi)) |
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39 | #define indirblk1 (*fsig_int2(ffi)) |
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40 | |
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41 | static int openi(fsi_file_t *, grub_ino_t); |
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42 | static grub_ino_t dlook(fsi_file_t *, grub_ino_t, char *); |
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43 | static grub_daddr32_t sbmap(fsi_file_t *, grub_daddr32_t); |
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44 | |
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45 | /* read superblock and check fs magic */ |
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46 | int |
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47 | ufs_mount(fsi_file_t *ffi, const char *options) |
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48 | { |
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49 | if (/*! IS_PC_SLICE_TYPE_SOLARIS(current_slice) || */ |
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50 | !devread(ffi, UFS_SBLOCK, 0, UFS_SBSIZE, (char *)SUPERBLOCK) || |
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51 | SUPERBLOCK->fs_magic != UFS_MAGIC) |
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52 | return 0; |
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53 | |
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54 | return 1; |
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55 | } |
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56 | |
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57 | |
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58 | /* |
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59 | * searching for a file, if successful, inode will be loaded in INODE |
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60 | * The entry point should really be named ufs_open(char *pathname). |
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61 | * For now, keep it consistent with the rest of fsys modules. |
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62 | */ |
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63 | int |
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64 | ufs_dir(fsi_file_t *ffi, char *dirname) |
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65 | { |
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66 | grub_ino_t inode = ROOTINO; /* start from root */ |
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67 | char *fname, ch; |
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68 | |
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69 | indirblk0 = indirblk1 = 0; |
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70 | |
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71 | /* skip leading slashes */ |
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72 | while (*dirname == '/') |
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73 | dirname++; |
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74 | |
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75 | while (inode && *dirname && !isspace(*dirname)) { |
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76 | if (!openi(ffi, inode)) |
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77 | return 0; |
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78 | |
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79 | /* parse for next path component */ |
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80 | fname = dirname; |
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81 | while (*dirname && !isspace(*dirname) && *dirname != '/') |
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82 | dirname++; |
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83 | ch = *dirname; |
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84 | *dirname = 0; /* ensure null termination */ |
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85 | |
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86 | inode = dlook(ffi, inode, fname); |
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87 | *dirname = ch; |
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88 | while (*dirname == '/') |
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89 | dirname++; |
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90 | } |
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91 | |
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92 | /* return 1 only if inode exists and is a regular file */ |
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93 | if (! openi(ffi, inode)) |
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94 | return (0); |
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95 | filepos = 0; |
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96 | filemax = INODE->ic_sizelo; |
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97 | return (inode && ((INODE->ic_smode & IFMT) == IFREG)); |
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98 | } |
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99 | |
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100 | /* |
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101 | * This is the high-level read function. |
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102 | */ |
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103 | int |
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104 | ufs_read(fsi_file_t *ffi, char *buf, int len) |
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105 | { |
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106 | int off, size, ret = 0, ok; |
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107 | grub_daddr32_t lblk, dblk; |
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108 | |
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109 | while (len) { |
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110 | off = blkoff(SUPERBLOCK, filepos); |
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111 | lblk = lblkno(SUPERBLOCK, filepos); |
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112 | size = SUPERBLOCK->fs_bsize; |
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113 | size -= off; |
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114 | if (size > len) |
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115 | size = len; |
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116 | |
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117 | if ((dblk = sbmap(ffi, lblk)) <= 0) { |
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118 | /* we are in a file hole, just zero the buf */ |
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119 | grub_memset(buf, 0, size); |
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120 | } else { |
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121 | disk_read_func = disk_read_hook; |
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122 | ok = devread(ffi, fsbtodb(SUPERBLOCK, dblk), |
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123 | off, size, buf); |
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124 | disk_read_func = 0; |
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125 | if (!ok) |
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126 | return 0; |
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127 | } |
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128 | buf += size; |
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129 | len -= size; |
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130 | filepos += size; |
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131 | ret += size; |
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132 | } |
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133 | |
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134 | return (ret); |
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135 | } |
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136 | |
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137 | int |
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138 | ufs_embed (int *start_sector, int needed_sectors) |
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139 | { |
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140 | if (needed_sectors > 14) |
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141 | return 0; |
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142 | |
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143 | *start_sector = 2; |
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144 | return 1; |
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145 | } |
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146 | |
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147 | /* read inode and place content in INODE */ |
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148 | static int |
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149 | openi(fsi_file_t *ffi, grub_ino_t inode) |
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150 | { |
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151 | grub_daddr32_t dblk; |
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152 | int off; |
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153 | |
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154 | /* get block and byte offset into the block */ |
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155 | dblk = fsbtodb(SUPERBLOCK, itod(SUPERBLOCK, inode)); |
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156 | off = itoo(SUPERBLOCK, inode) * sizeof (struct icommon); |
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157 | |
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158 | return (devread(ffi, dblk, off, sizeof (struct icommon), (char *)INODE)); |
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159 | } |
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160 | |
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161 | /* |
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162 | * Performs fileblock mapping. Convert file block no. to disk block no. |
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163 | * Returns 0 when block doesn't exist and <0 when block isn't initialized |
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164 | * (i.e belongs to a hole in the file). |
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165 | */ |
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166 | grub_daddr32_t |
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167 | sbmap(fsi_file_t *ffi, grub_daddr32_t bn) |
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168 | { |
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169 | int level, bound, i, index; |
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170 | grub_daddr32_t nb, blkno; |
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171 | grub_daddr32_t *db = INODE->ic_db; |
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172 | |
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173 | /* blocks 0..UFS_NDADDR are direct blocks */ |
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174 | if (bn < UFS_NDADDR) { |
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175 | return db[bn]; |
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176 | } |
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177 | |
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178 | /* determine how many levels of indirection. */ |
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179 | level = 0; |
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180 | bn -= UFS_NDADDR; |
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181 | bound = UFS_NINDIR(SUPERBLOCK); |
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182 | while (bn >= bound) { |
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183 | level++; |
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184 | bn -= bound; |
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185 | bound *= UFS_NINDIR(SUPERBLOCK); |
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186 | } |
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187 | if (level >= UFS_NIADDR) /* bn too big */ |
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188 | return ((grub_daddr32_t)0); |
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189 | |
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190 | /* fetch the first indirect block */ |
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191 | nb = INODE->ic_ib[level]; |
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192 | if (nb == 0) { |
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193 | return ((grub_daddr32_t)0); |
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194 | } |
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195 | if (indirblk0 != nb) { |
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196 | indirblk0 = 0; |
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197 | blkno = fsbtodb(SUPERBLOCK, nb); |
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198 | if (!devread(ffi, blkno, 0, SUPERBLOCK->fs_bsize, |
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199 | (char *)INDIRBLK0)) |
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200 | return (0); |
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201 | indirblk0 = nb; |
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202 | } |
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203 | bound /= UFS_NINDIR(SUPERBLOCK); |
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204 | index = (bn / bound) % UFS_NINDIR(SUPERBLOCK); |
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205 | nb = INDIRBLK0[index]; |
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206 | |
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207 | /* fetch through the indirect blocks */ |
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208 | for (i = 1; i <= level; i++) { |
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209 | if (indirblk1 != nb) { |
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210 | blkno = fsbtodb(SUPERBLOCK, nb); |
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211 | if (!devread(ffi, blkno, 0, SUPERBLOCK->fs_bsize, |
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212 | (char *)INDIRBLK1)) |
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213 | return (0); |
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214 | indirblk1 = nb; |
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215 | } |
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216 | bound /= UFS_NINDIR(SUPERBLOCK); |
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217 | index = (bn / bound) % UFS_NINDIR(SUPERBLOCK); |
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218 | nb = INDIRBLK1[index]; |
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219 | if (nb == 0) |
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220 | return ((grub_daddr32_t)0); |
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221 | } |
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222 | |
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223 | return (nb); |
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224 | } |
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225 | |
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226 | /* search directory content for name, return inode number */ |
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227 | static grub_ino_t |
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228 | dlook(fsi_file_t *ffi, grub_ino_t dir_ino, char *name) |
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229 | { |
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230 | int loc, off; |
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231 | grub_daddr32_t lbn, dbn, dblk; |
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232 | struct direct *dp; |
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233 | |
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234 | if ((INODE->ic_smode & IFMT) != IFDIR) |
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235 | return 0; |
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236 | |
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237 | loc = 0; |
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238 | while (loc < INODE->ic_sizelo) { |
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239 | /* offset into block */ |
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240 | off = blkoff(SUPERBLOCK, loc); |
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241 | if (off == 0) { /* need to read in a new block */ |
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242 | /* get logical block number */ |
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243 | lbn = lblkno(SUPERBLOCK, loc); |
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244 | /* resolve indrect blocks */ |
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245 | dbn = sbmap(ffi, lbn); |
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246 | if (dbn == 0) |
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247 | return (0); |
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248 | |
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249 | dblk = fsbtodb(SUPERBLOCK, dbn); |
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250 | if (!devread(ffi, dblk, 0, SUPERBLOCK->fs_bsize, |
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251 | (char *)DIRENT)) { |
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252 | return 0; |
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253 | } |
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254 | } |
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255 | |
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256 | dp = (struct direct *)(DIRENT + off); |
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257 | if (dp->d_ino && substring(name, dp->d_name) == 0) |
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258 | return (dp->d_ino); |
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259 | loc += dp->d_reclen; |
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260 | } |
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261 | return (0); |
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262 | } |
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263 | |
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264 | fsi_plugin_ops_t * |
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265 | fsi_init_plugin(int version, fsi_plugin_t *fp, const char **name) |
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266 | { |
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267 | static fsig_plugin_ops_t ops = { |
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268 | FSIMAGE_PLUGIN_VERSION, |
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269 | .fpo_mount = ufs_mount, |
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270 | .fpo_dir = ufs_dir, |
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271 | .fpo_read = ufs_read |
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272 | }; |
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273 | |
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274 | *name = "ufs"; |
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275 | return (fsig_init(fp, &ops)); |
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276 | } |
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