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Merge from eCos master repository on 2002-05-23-21:39:14-BST
author jlarmour
date Thu, 23 May 2002 22:59:51 +0000
parents e0c0827131d1
children 548125f9b000
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1 //==========================================================================
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2 //
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3 // romfs.c
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4 //
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5 // ROM file system
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6 //
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7 //==========================================================================
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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/
208
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
156
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): nickg
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44 // Contributors: nickg, richard.panton@3glab.com
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45 // Date: 2000-07-25
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46 // Purpose: ROM file system
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47 // Description: This is a ROM filesystem for eCos. It attempts to
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48 // provide full POSIX-compatible filesystem behaviour
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49 // while at the same time being efficient in terms of
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50 // time and space used.
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51 //
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52 //
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53 //####DESCRIPTIONEND####
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54 //
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55 //==========================================================================
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56 //
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57 // General Description
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58 // ===================
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59 //
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60 // This is an implementation of a ROM filesystem for eCos. Its goal is
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61 // to provide a working example of a filesystem that provides most of
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62 // the required POSIX functionality. And obviously it may also be
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63 // useful in its own right.
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64 //
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65 //
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66 // Header
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67 // ------
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68 //
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69 // There is a single header that describes the overall format of the ROMFS
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70 // disk. The address of this header is used as the base for all offsets used
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71 // in the node and directory structures. It contains the following fields:
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72 //
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73 // label - A human readable label for various purposes
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74 // fssize - The size in bytes of the entire ROMFS disk
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75 // nodes - A count of the nodes in the disk
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76 //
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77 // Immediately following thisin memory is the node table, consisting of
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78 // 'nodes' repetitions of the node object.
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79 //
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80 // Nodes
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81 // -----
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82 //
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83 // All files and directories are represented by node objects. Each
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84 // romfs_node structure contains the following fields:
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85 //
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86 // mode - Node type, file or directory.
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87 // nlink - Number of links to this node. Each directory entry that references
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88 // this node is a link.
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89 // size - Size of the data in this node in bytes.
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90 // ctime - Creation time of the file (NOT the ROMFS)
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91 // data - Offset of the first data byte for this node from the header
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92 //
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93 // Directories
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94 // -----------
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95 //
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96 // A directory is a node whose data is a list of directory entries.
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97 // These contain the
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98 // following fields:
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99 //
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100 // node - Index of the node in the romfs_disk table that is referenced by
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101 // this entry. This is present in every directory entry fragment.
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102 // next - Offset of the next name entry.
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103 // name - The filename associated with this link to the node.
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104 //
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105 // Data Storage
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106 // ------------
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107 //
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108 // Each file has its data stored in a single contiguous memory block
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109 // referenced by the offset in the node.
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110 //
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111 //==========================================================================
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112
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113 #include <pkgconf/system.h>
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114 #include <pkgconf/hal.h>
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115 #include <pkgconf/kernel.h>
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116 #include <pkgconf/io_fileio.h>
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117 #include <pkgconf/fs_rom.h>
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118
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119 #include <cyg/kernel/ktypes.h> // base kernel types
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120 #include <cyg/infra/cyg_trac.h> // tracing macros
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121 #include <cyg/infra/cyg_ass.h> // assertion macros
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122
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123 #include <unistd.h>
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124 #include <sys/types.h>
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125 #include <fcntl.h>
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126 #include <sys/stat.h>
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127 #include <errno.h>
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128 #include <dirent.h>
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129
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130 #include <stdarg.h>
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131 #include <stdio.h>
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132 #include <stdlib.h>
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133 #include <string.h>
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134
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135 #include <cyg/fileio/fileio.h>
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136
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137 #include <cyg/kernel/kapi.h>
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138 #include <cyg/infra/diag.h>
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139
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140 //==========================================================================
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141 // Eventually we want to eXecute In Place from the ROM in a protected
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142 // environment, so we'll need executables to be aligned to a boundary
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143 // suitable for MMU protection. A suitable boundary would be the 4k
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144 // boundary in all the CPU architectures I am currently aware of.
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145
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146 // Forward definitions
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147
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148 // Filesystem operations
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149 static int romfs_mount ( cyg_fstab_entry *fste, cyg_mtab_entry *mte );
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150 static int romfs_umount ( cyg_mtab_entry *mte );
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151 static int romfs_open ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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152 int mode, cyg_file *fte );
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153 static int romfs_opendir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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154 cyg_file *fte );
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155 static int romfs_chdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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156 cyg_dir *dir_out );
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157 static int romfs_stat ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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158 struct stat *buf);
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159 static int romfs_getinfo ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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160 int key, void *buf, int len );
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161 static int romfs_setinfo ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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162 int key, void *buf, int len );
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163
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164 // File operations
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165 static int romfs_fo_read (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio);
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166 static int romfs_fo_lseek (struct CYG_FILE_TAG *fp, off_t *pos, int whence );
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167 static int romfs_fo_ioctl (struct CYG_FILE_TAG *fp, CYG_ADDRWORD com,
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168 CYG_ADDRWORD data);
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169 static int romfs_fo_fsync (struct CYG_FILE_TAG *fp, int mode );
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170 static int romfs_fo_close (struct CYG_FILE_TAG *fp);
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171 static int romfs_fo_fstat (struct CYG_FILE_TAG *fp, struct stat *buf );
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172 static int romfs_fo_getinfo (struct CYG_FILE_TAG *fp, int key, void *buf, int len );
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173 static int romfs_fo_setinfo (struct CYG_FILE_TAG *fp, int key, void *buf, int len );
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174
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175 // Directory operations
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176 static int romfs_fo_dirread (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio);
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177 static int romfs_fo_dirlseek (struct CYG_FILE_TAG *fp, off_t *pos, int whence );
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178
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179
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180 //==========================================================================
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181 // Filesystem table entries
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182
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183 // -------------------------------------------------------------------------
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184 // Fstab entry.
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185 // This defines the entry in the filesystem table.
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186 // For simplicity we use _FILESYSTEM synchronization for all accesses since
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187 // we should never block in any filesystem operations.
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188
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189 FSTAB_ENTRY( romfs_fste, "romfs", 0,
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190 CYG_SYNCMODE_FILE_FILESYSTEM|CYG_SYNCMODE_IO_FILESYSTEM,
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191 romfs_mount,
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192 romfs_umount,
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193 romfs_open,
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194 (cyg_fsop_unlink *)cyg_fileio_erofs,
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195 (cyg_fsop_mkdir *)cyg_fileio_erofs,
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196 (cyg_fsop_rmdir *)cyg_fileio_erofs,
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197 (cyg_fsop_rename *)cyg_fileio_erofs,
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198 (cyg_fsop_link *)cyg_fileio_erofs,
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199 romfs_opendir,
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200 romfs_chdir,
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201 romfs_stat,
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202 romfs_getinfo,
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203 romfs_setinfo);
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204
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205 // -------------------------------------------------------------------------
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206 // mtab entry.
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207 // This defines a single ROMFS loaded into ROM at the configured address
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208 //
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209 // MTAB_ENTRY( rom_mte, // structure name
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210 // "/rom", // mount point
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211 // "romfs", // FIlesystem type
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212 // "", // hardware device
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213 // (CYG_ADDRWORD) CYGNUM_FS_ROM_BASE_ADDRESS // Address in ROM
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214 // );
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215
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216
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217 // -------------------------------------------------------------------------
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218 // File operations.
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219 // This set of file operations are used for normal open files.
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220
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221 static cyg_fileops romfs_fileops =
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222 {
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223 romfs_fo_read,
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224 (cyg_fileop_write *)cyg_fileio_erofs,
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225 romfs_fo_lseek,
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226 romfs_fo_ioctl,
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227 cyg_fileio_seltrue,
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228 romfs_fo_fsync,
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229 romfs_fo_close,
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230 romfs_fo_fstat,
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231 romfs_fo_getinfo,
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232 romfs_fo_setinfo
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233 };
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234
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235 // -------------------------------------------------------------------------
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236 // Directory file operations.
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237 // This set of operations are used for open directories. Most entries
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238 // point to error-returning stub functions. Only the read, lseek and
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239 // close entries are functional.
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240
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241 static cyg_fileops romfs_dirops =
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242 {
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243 romfs_fo_dirread,
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244 (cyg_fileop_write *)cyg_fileio_enosys,
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245 romfs_fo_dirlseek,
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246 (cyg_fileop_ioctl *)cyg_fileio_enosys,
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247 cyg_fileio_seltrue,
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248 (cyg_fileop_fsync *)cyg_fileio_enosys,
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249 romfs_fo_close,
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250 (cyg_fileop_fstat *)cyg_fileio_enosys,
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251 (cyg_fileop_getinfo *)cyg_fileio_enosys,
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252 (cyg_fileop_setinfo *)cyg_fileio_enosys
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253 };
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254
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255 //==========================================================================
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256 // Data typedefs
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257 // Some forward typedefs for the main data structures.
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258
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259 struct romfs_disk;
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260 typedef struct romfs_disk romfs_disk;
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261
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262 struct romfs_node;
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263 typedef struct romfs_node romfs_node;
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264
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265 struct romfs_dirent;
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266 typedef struct romfs_dirent romfs_dirent;
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267
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268 //==========================================================================
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269 // File and directory node
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270 // This data structure represents a file or directory.
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271
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272 struct romfs_node
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273 {
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274 cyg_uint32 mode; // 0-3 node type
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275 cyg_ucount32 nlink; // 4-7 number of links to this node
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276 cyg_uint16 uid; // 8-9 Owner id
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277 cyg_uint16 gid; // 10-11 Group id
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278 cyg_uint32 size; // 12-15 size of file in bytes
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279 cyg_uint32 ctime; // 16-19 creation status time
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280 cyg_uint32 offset; // 20-23 offset of data from start of ROMFS
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281 cyg_uint32 pad[2]; // 24-31 padding to align to 32byte boundary
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282 };
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283
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284 //==========================================================================
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285 // Directory entry.
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286 // Variable sized entry containing the name and node of a directory entry
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287
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288 struct romfs_dirent
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289 {
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290 cyg_ucount32 node; // Index of node in romfs_disk structure
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291 cyg_uint32 next; // Offset from start of directory of
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292 // a) the next entry, or
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293 // b) the end of the directory data
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294 char name[0]; // The name, NUL terminated
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295 };
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296
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297 //==========================================================================
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298 // ROMFS header
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299 // This data structure contains overall information on the ROMFS
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300
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301 struct romfs_disk
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302 {
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303 cyg_uint32 magic; // 0-3 Marks a valid ROMFS entry
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304 cyg_ucount32 nodecount; // 4-7 Count of nodes in this filesystem
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305 cyg_ucount32 disksize; // 8-11 Count of bytes in this filesystem
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306 cyg_uint32 dev_id; // 12-15 ID of disk (put into stat.st_dev)
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307 char name[16]; // 16-31 Name - pads to 32 bytes
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308 romfs_node node[0];
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309 };
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310
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311 #define ROMFS_MAGIC 0x526f6d2e // The magic signature word for a romfs
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312 #define ROMFS_CIGAM 0x2e6d6f52 // The byte sex is wrong if you see this
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313
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314 //==========================================================================
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315 // Directory search data
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316 // Parameters for a directory search. The fields of this structure are
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317 // updated as we follow a pathname through the directory tree.
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318
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319 struct romfs_dirsearch
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320 {
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321 romfs_disk *disk; // disk structure
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322 romfs_node *dir; // directory to search
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323 const char *path; // path to follow
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324 romfs_node *node; // Node found
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325 const char *name; // last name used
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326 int namelen; // name fragment length
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327 cyg_bool last; // last name in path?
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328 };
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329
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330 typedef struct romfs_dirsearch romfs_dirsearch;
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331
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332 //==========================================================================
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333 // This seems to be the only string function referenced. Define as static
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334 // here to avoid having to load the string library
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335
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336 static bool match( const char *a, const char *b, int len )
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337 {
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338 for ( ; len > 0 && *a && *b && *a == *b ; a++, b++, len-- )
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339 ;
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340 return ( len == 0 );
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341 }
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342
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343
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344 //==========================================================================
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345 // SIMPLE buffer management.
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346 // Each node has a data buffer pointer and a size.
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347
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348 // -------------------------------------------------------------------------
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349 // findbuffer_node()
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350 // return a pointer to the data at the indicated file position.
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351
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352 static int findbuffer_node( romfs_disk *disk, // header pointer
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353 romfs_node *node, // node pointer
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354 off_t pos, // data position to get
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355 cyg_uint8 **buffer, // returned buffer pointer
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356 size_t *size) // returned buffer size
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357 {
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358 if ( pos >= node->size || node->size == 0 )
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359 {
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360 // Indicate end of data.
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361 *size = 0;
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362 } else {
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363
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364 // Calculate the buffer position
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365 *buffer = (cyg_uint8*)disk + node->offset + pos;
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366 *size = node->size-pos;
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367 }
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368
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369 return ENOERR;
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370 }
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371
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372 //==========================================================================
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373 // Directory operations
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374
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375
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376 // -------------------------------------------------------------------------
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377 // find_direntry()
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378 // Find a directory entry for the name and return a pointer to the first
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379 // entry fragment.
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380
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381 static romfs_dirent *find_direntry( romfs_disk *disk, romfs_node *dir, const char *name, int namelen )
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382 {
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383 off_t pos = 0;
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384 int err;
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385
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386 // Loop over all the entries until a match is found or we run out
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387 // of data.
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388 while( pos < dir->size )
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389 {
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390 romfs_dirent *d;
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391 cyg_uint8 *buf;
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392 size_t size;
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393
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394 err = findbuffer_node( disk, dir, pos, &buf, &size );
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395 if( err != ENOERR || size == 0)
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396 return NULL;
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397
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398 d = (romfs_dirent *)buf;
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399
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400 // Is this the directory entry we're looking for?
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401 if ( match( d->name, name, namelen ) )
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402 return d;
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403
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404 // Otherwise move on to next entry in chain
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405 pos = d->next;
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406 }
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407
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408 return NULL;
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409 }
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410
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411 //==========================================================================
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412 // Directory search
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413
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414 // -------------------------------------------------------------------------
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415 // init_dirsearch()
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416 // Initialize a dirsearch object to start a search
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417
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418 static void init_dirsearch( romfs_dirsearch *ds,
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419 romfs_disk *disk,
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420 romfs_node *dir,
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421 const char *name)
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422 {
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423 ds->disk = disk;
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jlarmour
parents:
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424 ds->dir = dir;
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jlarmour
parents:
diff changeset
425 ds->path = name;
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jlarmour
parents:
diff changeset
426 ds->node = dir;
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jlarmour
parents:
diff changeset
427 ds->name = name;
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jlarmour
parents:
diff changeset
428 ds->namelen = 0;
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jlarmour
parents:
diff changeset
429 ds->last = false;
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jlarmour
parents:
diff changeset
430 }
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jlarmour
parents:
diff changeset
431
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jlarmour
parents:
diff changeset
432 // -------------------------------------------------------------------------
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jlarmour
parents:
diff changeset
433 // find_entry()
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jlarmour
parents:
diff changeset
434 // Search a single directory for the next name in a path and update the
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jlarmour
parents:
diff changeset
435 // dirsearch object appropriately.
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jlarmour
parents:
diff changeset
436
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jlarmour
parents:
diff changeset
437 static int find_entry( romfs_dirsearch *ds )
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jlarmour
parents:
diff changeset
438 {
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jlarmour
parents:
diff changeset
439 romfs_node *dir = ds->dir;
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jlarmour
parents:
diff changeset
440 const char *name = ds->path;
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jlarmour
parents:
diff changeset
441 const char *n = name;
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jlarmour
parents:
diff changeset
442 int namelen = 0;
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jlarmour
parents:
diff changeset
443 romfs_dirent *d;
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jlarmour
parents:
diff changeset
444
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jlarmour
parents:
diff changeset
445 // check that we really have a directory
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jlarmour
parents:
diff changeset
446 if( !S_ISDIR(dir->mode) )
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jlarmour
parents:
diff changeset
447 return ENOTDIR;
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jlarmour
parents:
diff changeset
448
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jlarmour
parents:
diff changeset
449 // Isolate the next element of the path name.
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jlarmour
parents:
diff changeset
450 while( *n != '\0' && *n != '/' )
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jlarmour
parents:
diff changeset
451 n++, namelen++;
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jlarmour
parents:
diff changeset
452
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jlarmour
parents:
diff changeset
453 // If we terminated on a NUL, set last flag.
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jlarmour
parents:
diff changeset
454 if( *n == '\0' )
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jlarmour
parents:
diff changeset
455 ds->last = true;
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jlarmour
parents:
diff changeset
456
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jlarmour
parents:
diff changeset
457 // update name in dirsearch object
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jlarmour
parents:
diff changeset
458 ds->name = name;
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jlarmour
parents:
diff changeset
459 ds->namelen = namelen;
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jlarmour
parents:
diff changeset
460
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jlarmour
parents:
diff changeset
461 // Here we have the name and its length set up.
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jlarmour
parents:
diff changeset
462 // Search the directory for a matching entry
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jlarmour
parents:
diff changeset
463
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jlarmour
parents:
diff changeset
464 d = find_direntry( ds->disk, dir, name, namelen );
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jlarmour
parents:
diff changeset
465
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jlarmour
parents:
diff changeset
466 if( d == NULL )
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jlarmour
parents:
diff changeset
467 return ENOENT;
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jlarmour
parents:
diff changeset
468
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jlarmour
parents:
diff changeset
469 // pass back the node we have found
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jlarmour
parents:
diff changeset
470 ds->node = &ds->disk->node[d->node];
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jlarmour
parents:
diff changeset
471
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jlarmour
parents:
diff changeset
472 return ENOERR;
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jlarmour
parents:
diff changeset
473
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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 // -------------------------------------------------------------------------
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jlarmour
parents:
diff changeset
477 // romfs_find()
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jlarmour
parents:
diff changeset
478 // Main interface to directory search code. This is used in all file
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jlarmour
parents:
diff changeset
479 // level operations to locate the object named by the pathname.
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jlarmour
parents:
diff changeset
480
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jlarmour
parents:
diff changeset
481 static int romfs_find( romfs_dirsearch *d )
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jlarmour
parents:
diff changeset
482 {
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jlarmour
parents:
diff changeset
483 int err;
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jlarmour
parents:
diff changeset
484
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
485 // Short circuit empty paths
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jlarmour
parents:
diff changeset
486 if( *(d->path) == '\0' )
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jlarmour
parents:
diff changeset
487 return ENOERR;
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jlarmour
parents:
diff changeset
488
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jlarmour
parents:
diff changeset
489 // iterate down directory tree until we find the object
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jlarmour
parents:
diff changeset
490 // we want.
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jlarmour
parents:
diff changeset
491 for(;;)
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jlarmour
parents:
diff changeset
492 {
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jlarmour
parents:
diff changeset
493 err = find_entry( d );
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jlarmour
parents:
diff changeset
494
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jlarmour
parents:
diff changeset
495 if( err != ENOERR )
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jlarmour
parents:
diff changeset
496 return err;
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jlarmour
parents:
diff changeset
497
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jlarmour
parents:
diff changeset
498 if( d->last )
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jlarmour
parents:
diff changeset
499 return ENOERR;
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jlarmour
parents:
diff changeset
500
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jlarmour
parents:
diff changeset
501 // Update dirsearch object to search next directory.
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jlarmour
parents:
diff changeset
502 d->dir = d->node;
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jlarmour
parents:
diff changeset
503 d->path += d->namelen;
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jlarmour
parents:
diff changeset
504 if( *(d->path) == '/' ) d->path++; // skip dirname separators
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jlarmour
parents:
diff changeset
505 }
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jlarmour
parents:
diff changeset
506 }
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
507
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
508 //==========================================================================
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jlarmour
parents:
diff changeset
509 // Pathconf support
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
510 // This function provides support for pathconf() and fpathconf().
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jlarmour
parents:
diff changeset
511
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jlarmour
parents:
diff changeset
512 static int romfs_pathconf( romfs_node *node, struct cyg_pathconf_info *info )
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jlarmour
parents:
diff changeset
513 {
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jlarmour
parents:
diff changeset
514 int err = ENOERR;
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jlarmour
parents:
diff changeset
515
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jlarmour
parents:
diff changeset
516 switch( info->name )
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jlarmour
parents:
diff changeset
517 {
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jlarmour
parents:
diff changeset
518 case _PC_LINK_MAX:
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jlarmour
parents:
diff changeset
519 info->value = LINK_MAX;
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jlarmour
parents:
diff changeset
520 break;
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jlarmour
parents:
diff changeset
521
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jlarmour
parents:
diff changeset
522 case _PC_MAX_CANON:
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jlarmour
parents:
diff changeset
523 info->value = -1; // not supported
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jlarmour
parents:
diff changeset
524 err = EINVAL;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
525 break;
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jlarmour
parents:
diff changeset
526
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jlarmour
parents:
diff changeset
527 case _PC_MAX_INPUT:
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jlarmour
parents:
diff changeset
528 info->value = -1; // not supported
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jlarmour
parents:
diff changeset
529 err = EINVAL;
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jlarmour
parents:
diff changeset
530 break;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
531
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
532 case _PC_NAME_MAX:
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jlarmour
parents:
diff changeset
533 info->value = NAME_MAX;
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jlarmour
parents:
diff changeset
534 break;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
535
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
536 case _PC_PATH_MAX:
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jlarmour
parents:
diff changeset
537 info->value = PATH_MAX;
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jlarmour
parents:
diff changeset
538 break;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
539
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
540 case _PC_PIPE_BUF:
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jlarmour
parents:
diff changeset
541 info->value = -1; // not supported
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
542 err = EINVAL;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
543 break;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
544
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
545
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jlarmour
parents:
diff changeset
546 case _PC_ASYNC_IO:
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jlarmour
parents:
diff changeset
547 info->value = -1; // not supported
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jlarmour
parents:
diff changeset
548 err = EINVAL;
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jlarmour
parents:
diff changeset
549 break;
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jlarmour
parents:
diff changeset
550
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jlarmour
parents:
diff changeset
551 case _PC_CHOWN_RESTRICTED:
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jlarmour
parents:
diff changeset
552 info->value = -1; // not supported
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
553 err = EINVAL;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
554 break;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
555
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
556 case _PC_NO_TRUNC:
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jlarmour
parents:
diff changeset
557 info->value = 0;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
558 break;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
559
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
560 case _PC_PRIO_IO:
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jlarmour
parents:
diff changeset
561 info->value = 0;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
562 break;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
563
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
564 case _PC_SYNC_IO:
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jlarmour
parents:
diff changeset
565 info->value = 0;
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jlarmour
parents:
diff changeset
566 break;
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jlarmour
parents:
diff changeset
567
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
568 case _PC_VDISABLE:
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jlarmour
parents:
diff changeset
569 info->value = -1; // not supported
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
570 err = EINVAL;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
571 break;
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jlarmour
parents:
diff changeset
572
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
573 default:
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jlarmour
parents:
diff changeset
574 err = EINVAL;
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jlarmour
parents:
diff changeset
575 break;
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jlarmour
parents:
diff changeset
576 }
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jlarmour
parents:
diff changeset
577
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jlarmour
parents:
diff changeset
578 return err;
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jlarmour
parents:
diff changeset
579 }
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jlarmour
parents:
diff changeset
580
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jlarmour
parents:
diff changeset
581 //==========================================================================
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jlarmour
parents:
diff changeset
582 // Filesystem operations
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jlarmour
parents:
diff changeset
583
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jlarmour
parents:
diff changeset
584 // -------------------------------------------------------------------------
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jlarmour
parents:
diff changeset
585 // romfs_mount()
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jlarmour
parents:
diff changeset
586 // Process a mount request. This mainly finds root for the
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jlarmour
parents:
diff changeset
587 // filesystem.
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jlarmour
parents:
diff changeset
588
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jlarmour
parents:
diff changeset
589 static int romfs_mount ( cyg_fstab_entry *fste, cyg_mtab_entry *mte )
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jlarmour
parents:
diff changeset
590 {
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jlarmour
parents:
diff changeset
591 romfs_disk *disk;
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jlarmour
parents:
diff changeset
592
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jlarmour
parents:
diff changeset
593 if ( !mte->data ) {
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jlarmour
parents:
diff changeset
594 // If the image address was not in the MTE data word,
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jlarmour
parents:
diff changeset
595 if ( mte->devname && mte->devname[0] ) {
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jlarmour
parents:
diff changeset
596 // And there's something in the 'hardware device' field,
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jlarmour
parents:
diff changeset
597 // then read the address from there.
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parents:
diff changeset
598 sscanf( mte->devname, "%p", (char**)&mte->data );
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parents:
diff changeset
599 }
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jlarmour
parents:
diff changeset
600 }
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jlarmour
parents:
diff changeset
601
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jlarmour
parents:
diff changeset
602 if ( !mte->data ) {
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jlarmour
parents:
diff changeset
603 // If still no address, try the FSTAB entry data word
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jlarmour
parents:
diff changeset
604 mte->data = fste->data;
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jlarmour
parents:
diff changeset
605 }
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jlarmour
parents:
diff changeset
606
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jlarmour
parents:
diff changeset
607 if ( !mte->data ) {
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jlarmour
parents:
diff changeset
608 // If still no address, give up...
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jlarmour
parents:
diff changeset
609 return ENOENT;
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jlarmour
parents:
diff changeset
610 }
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jlarmour
parents:
diff changeset
611
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jlarmour
parents:
diff changeset
612 disk = (romfs_disk *)mte->data;
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jlarmour
parents:
diff changeset
613
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jlarmour
parents:
diff changeset
614 // Check the ROMFS magic number to ensure that there's really an fs.
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jlarmour
parents:
diff changeset
615 if ( disk->magic == ROMFS_CIGAM ) {
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jlarmour
parents:
diff changeset
616 // The disk image has the wrong byte sex!!!
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jlarmour
parents:
diff changeset
617 return EIO;
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parents:
diff changeset
618 } else if ( disk->magic != ROMFS_MAGIC || disk->nodecount == 0 ) {
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jlarmour
parents:
diff changeset
619 // No image found
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jlarmour
parents:
diff changeset
620 return ENOENT;
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jlarmour
parents:
diff changeset
621 }
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parents:
diff changeset
622
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jlarmour
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diff changeset
623 mte->root = (cyg_dir)&disk->node[0];
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parents:
diff changeset
624
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jlarmour
parents:
diff changeset
625 return ENOERR;
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jlarmour
parents:
diff changeset
626 }
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jlarmour
parents:
diff changeset
627
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jlarmour
parents:
diff changeset
628 // -------------------------------------------------------------------------
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jlarmour
parents:
diff changeset
629 // romfs_umount()
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jlarmour
parents:
diff changeset
630 // Unmount the filesystem. This will currently always succeed.
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jlarmour
parents:
diff changeset
631
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jlarmour
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diff changeset
632 static int romfs_umount ( cyg_mtab_entry *mte )
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jlarmour
parents:
diff changeset
633 {
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jlarmour
parents:
diff changeset
634 // Clear root pointer
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jlarmour
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diff changeset
635 mte->root = CYG_DIR_NULL;
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jlarmour
parents:
diff changeset
636
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jlarmour
parents:
diff changeset
637 // That's all folks.
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jlarmour
parents:
diff changeset
638
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jlarmour
parents:
diff changeset
639 return ENOERR;
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jlarmour
parents:
diff changeset
640 }
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jlarmour
parents:
diff changeset
641
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jlarmour
parents:
diff changeset
642 // -------------------------------------------------------------------------
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jlarmour
parents:
diff changeset
643 // romfs_open()
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jlarmour
parents:
diff changeset
644 // Open a file for reading
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jlarmour
parents:
diff changeset
645
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jlarmour
parents:
diff changeset
646 static int romfs_open ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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jlarmour
parents:
diff changeset
647 int mode, cyg_file *file )
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jlarmour
parents:
diff changeset
648 {
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jlarmour
parents:
diff changeset
649
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jlarmour
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diff changeset
650 romfs_dirsearch ds;
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jlarmour
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diff changeset
651 romfs_node *node = NULL;
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jlarmour
parents:
diff changeset
652 int err;
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jlarmour
parents:
diff changeset
653
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jlarmour
parents:
diff changeset
654 init_dirsearch( &ds, (romfs_disk *)mte->data, (romfs_node *)dir, name );
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jlarmour
parents:
diff changeset
655
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jlarmour
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diff changeset
656 err = romfs_find( &ds );
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jlarmour
parents:
diff changeset
657
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jlarmour
parents:
diff changeset
658 if( err == ENOENT )
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jlarmour
parents:
diff changeset
659 {
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jlarmour
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diff changeset
660 return ENOENT;
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jlarmour
parents:
diff changeset
661 }
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jlarmour
parents:
diff changeset
662 else if( err == ENOERR )
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jlarmour
parents:
diff changeset
663 {
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jlarmour
parents:
diff changeset
664 // The node exists. If the O_CREAT and O_EXCL bits are set, we
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jlarmour
parents:
diff changeset
665 // must fail the open.
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jlarmour
parents:
diff changeset
666
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jlarmour
parents:
diff changeset
667 if( (mode & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) )
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jlarmour
parents:
diff changeset
668 err = EEXIST;
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jlarmour
parents:
diff changeset
669 else node = ds.node;
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jlarmour
parents:
diff changeset
670 }
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jlarmour
parents:
diff changeset
671
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jlarmour
parents:
diff changeset
672 if( err == ENOERR && (mode & O_TRUNC ) )
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jlarmour
parents:
diff changeset
673 {
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jlarmour
parents:
diff changeset
674 // If the O_TRUNC bit is set we must fail the open
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jlarmour
parents:
diff changeset
675
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jlarmour
parents:
diff changeset
676 err = EPERM;
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jlarmour
parents:
diff changeset
677 }
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jlarmour
parents:
diff changeset
678
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jlarmour
parents:
diff changeset
679 if( err != ENOERR ) return err;
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jlarmour
parents:
diff changeset
680
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jlarmour
parents:
diff changeset
681 // Check that we actually have a file here
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jlarmour
parents:
diff changeset
682 if( S_ISDIR(node->mode) ) return EISDIR;
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jlarmour
parents:
diff changeset
683
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jlarmour
parents:
diff changeset
684 // Initialize the file object
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jlarmour
parents:
diff changeset
685
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jlarmour
parents:
diff changeset
686 file->f_flag |= mode & CYG_FILE_MODE_MASK;
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jlarmour
parents:
diff changeset
687 file->f_type = CYG_FILE_TYPE_FILE;
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jlarmour
parents:
diff changeset
688 file->f_ops = &romfs_fileops;
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jlarmour
parents:
diff changeset
689 file->f_offset = 0;
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jlarmour
parents:
diff changeset
690 file->f_data = (CYG_ADDRWORD)node;
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jlarmour
parents:
diff changeset
691 file->f_xops = 0;
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jlarmour
parents:
diff changeset
692
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jlarmour
parents:
diff changeset
693 return ENOERR;
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jlarmour
parents:
diff changeset
694 }
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jlarmour
parents:
diff changeset
695
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jlarmour
parents:
diff changeset
696 // -------------------------------------------------------------------------
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jlarmour
parents:
diff changeset
697 // romfs_opendir()
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jlarmour
parents:
diff changeset
698 // Open a directory for reading.
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jlarmour
parents:
diff changeset
699
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jlarmour
parents:
diff changeset
700 static int romfs_opendir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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jlarmour
parents:
diff changeset
701 cyg_file *file )
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jlarmour
parents:
diff changeset
702 {
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jlarmour
parents:
diff changeset
703 romfs_dirsearch ds;
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jlarmour
parents:
diff changeset
704 int err;
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jlarmour
parents:
diff changeset
705
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jlarmour
parents:
diff changeset
706 init_dirsearch( &ds, (romfs_disk *)mte->data, (romfs_node *)dir, name );
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jlarmour
parents:
diff changeset
707
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jlarmour
parents:
diff changeset
708 err = romfs_find( &ds );
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jlarmour
parents:
diff changeset
709
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jlarmour
parents:
diff changeset
710 if( err != ENOERR ) return err;
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jlarmour
parents:
diff changeset
711
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
712 // check it is really a directory.
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jlarmour
parents:
diff changeset
713 if( !S_ISDIR(ds.node->mode) ) return ENOTDIR;
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jlarmour
parents:
diff changeset
714
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jlarmour
parents:
diff changeset
715 // Initialize the file object, setting the f_ops field to a
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
716 // special set of file ops.
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jlarmour
parents:
diff changeset
717
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jlarmour
parents:
diff changeset
718 file->f_type = CYG_FILE_TYPE_FILE;
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jlarmour
parents:
diff changeset
719 file->f_ops = &romfs_dirops;
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jlarmour
parents:
diff changeset
720 file->f_offset = 0;
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jlarmour
parents:
diff changeset
721 file->f_data = (CYG_ADDRWORD)ds.node;
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jlarmour
parents:
diff changeset
722 file->f_xops = 0;
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jlarmour
parents:
diff changeset
723
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jlarmour
parents:
diff changeset
724 return ENOERR;
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jlarmour
parents:
diff changeset
725
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
726 }
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jlarmour
parents:
diff changeset
727
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jlarmour
parents:
diff changeset
728 // -------------------------------------------------------------------------
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jlarmour
parents:
diff changeset
729 // romfs_chdir()
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jlarmour
parents:
diff changeset
730 // Change directory support.
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jlarmour
parents:
diff changeset
731
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jlarmour
parents:
diff changeset
732 static int romfs_chdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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jlarmour
parents:
diff changeset
733 cyg_dir *dir_out )
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jlarmour
parents:
diff changeset
734 {
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jlarmour
parents:
diff changeset
735 if( dir_out != NULL )
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jlarmour
parents:
diff changeset
736 {
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jlarmour
parents:
diff changeset
737 // This is a request to get a new directory pointer in
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
738 // *dir_out.
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jlarmour
parents:
diff changeset
739
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jlarmour
parents:
diff changeset
740 romfs_dirsearch ds;
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jlarmour
parents:
diff changeset
741 int err;
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jlarmour
parents:
diff changeset
742
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jlarmour
parents:
diff changeset
743 init_dirsearch( &ds, (romfs_disk *)mte->data, (romfs_node *)dir, name );
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jlarmour
parents:
diff changeset
744
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jlarmour
parents:
diff changeset
745 err = romfs_find( &ds );
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jlarmour
parents:
diff changeset
746
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jlarmour
parents:
diff changeset
747 if( err != ENOERR ) return err;
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jlarmour
parents:
diff changeset
748
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jlarmour
parents:
diff changeset
749 // check it is a directory
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jlarmour
parents:
diff changeset
750 if( !S_ISDIR(ds.node->mode) )
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jlarmour
parents:
diff changeset
751 return ENOTDIR;
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jlarmour
parents:
diff changeset
752
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jlarmour
parents:
diff changeset
753 // Pass it out
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jlarmour
parents:
diff changeset
754 *dir_out = (cyg_dir)ds.node;
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jlarmour
parents:
diff changeset
755 }
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jlarmour
parents:
diff changeset
756 // If no output dir is required, this means that the mte and
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jlarmour
parents:
diff changeset
757 // dir arguments are the current cdir setting and we should
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jlarmour
parents:
diff changeset
758 // forget this fact. Do nothing in ROMFS.
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jlarmour
parents:
diff changeset
759
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jlarmour
parents:
diff changeset
760 return ENOERR;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
761 }
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jlarmour
parents:
diff changeset
762
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jlarmour
parents:
diff changeset
763 // -------------------------------------------------------------------------
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jlarmour
parents:
diff changeset
764 // romfs_stat()
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jlarmour
parents:
diff changeset
765 // Get struct stat info for named object.
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jlarmour
parents:
diff changeset
766
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jlarmour
parents:
diff changeset
767 static int romfs_stat ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
768 struct stat *buf)
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jlarmour
parents:
diff changeset
769 {
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jlarmour
parents:
diff changeset
770 romfs_dirsearch ds;
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jlarmour
parents:
diff changeset
771 int err;
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jlarmour
parents:
diff changeset
772 romfs_disk *disk = (romfs_disk *)mte->data;
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jlarmour
parents:
diff changeset
773
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jlarmour
parents:
diff changeset
774 init_dirsearch( &ds, disk, (romfs_node *)dir, name );
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jlarmour
parents:
diff changeset
775
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jlarmour
parents:
diff changeset
776 err = romfs_find( &ds );
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jlarmour
parents:
diff changeset
777
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jlarmour
parents:
diff changeset
778 if( err != ENOERR ) return err;
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jlarmour
parents:
diff changeset
779
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
780 // Fill in the status
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jlarmour
parents:
diff changeset
781 buf->st_mode = ds.node->mode;
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jlarmour
parents:
diff changeset
782 buf->st_ino = (ino_t)(ds.node - &disk->node[0]);
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jlarmour
parents:
diff changeset
783 buf->st_dev = (dev_t)disk->dev_id;
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jlarmour
parents:
diff changeset
784 buf->st_nlink = ds.node->nlink;
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jlarmour
parents:
diff changeset
785 buf->st_uid = ds.node->uid;
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jlarmour
parents:
diff changeset
786 buf->st_gid = ds.node->gid;
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jlarmour
parents:
diff changeset
787 buf->st_size = ds.node->size;
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jlarmour
parents:
diff changeset
788 buf->st_atime = ds.node->ctime;
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jlarmour
parents:
diff changeset
789 buf->st_mtime = ds.node->ctime;
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jlarmour
parents:
diff changeset
790 buf->st_ctime = ds.node->ctime;
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jlarmour
parents:
diff changeset
791
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
792 return err;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
793 }
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jlarmour
parents:
diff changeset
794
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
795 // -------------------------------------------------------------------------
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
796 // romfs_getinfo()
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jlarmour
parents:
diff changeset
797 // Getinfo. Currently only support pathconf().
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
798
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
799 static int romfs_getinfo ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
800 int key, void *buf, int len )
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jlarmour
parents:
diff changeset
801 {
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
802 romfs_dirsearch ds;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
803 int err;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
804
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jlarmour
parents:
diff changeset
805 init_dirsearch( &ds, (romfs_disk *)mte->data, (romfs_node *)dir, name );
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
806
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
807 err = romfs_find( &ds );
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jlarmour
parents:
diff changeset
808
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
809 if( err != ENOERR ) return err;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
810
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
811 switch( key )
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
812 {
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
813 case FS_INFO_CONF:
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
814 err = romfs_pathconf( ds.node, (struct cyg_pathconf_info *)buf );
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
815 break;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
816
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
817 default:
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jlarmour
parents:
diff changeset
818 err = EINVAL;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
819 }
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jlarmour
parents:
diff changeset
820 return err;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
821 }
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
822
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
823 // -------------------------------------------------------------------------
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
824 // romfs_setinfo()
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
825 // Setinfo. Nothing to support here at present.
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
826
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
827 static int romfs_setinfo ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
828 int key, void *buf, int len )
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
829 {
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
830 // No setinfo keys supported at present
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jlarmour
parents:
diff changeset
831
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
832 return EINVAL;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
833 }
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jlarmour
parents:
diff changeset
834
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
835
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
836 //==========================================================================
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
837 // File operations
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
838
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
839 // -------------------------------------------------------------------------
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
840 // romfs_fo_read()
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
841 // Read data from the file.
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
842
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
843 static int romfs_fo_read (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio)
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
844 {
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jlarmour
parents:
diff changeset
845 romfs_node *node = (romfs_node *)fp->f_data;
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jlarmour
parents:
diff changeset
846 int i;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
847 off_t pos = fp->f_offset;
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jlarmour
parents:
diff changeset
848 ssize_t resid = uio->uio_resid;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
849
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
850 // Loop over the io vectors until there are none left
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jlarmour
parents:
diff changeset
851 for( i = 0; i < uio->uio_iovcnt; i++ )
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
852 {
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
853 cyg_iovec *iov = &uio->uio_iov[i];
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
854 char *buf = (char *)iov->iov_base;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
855 off_t len = iov->iov_len;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
856
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
857 // Loop over each vector filling it with data from the file.
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
858 while( len > 0 && pos < node->size )
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
859 {
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
860 cyg_uint8 *fbuf;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
861 size_t bsize;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
862 off_t l = len;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
863 int err;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
864
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
865 // Get a pointer to the data at offset _pos_.
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
866 err = findbuffer_node( (romfs_disk *)fp->f_mte->data, node, pos, &fbuf, &bsize );
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
867
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
868 if( err != ENOERR )
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
869 return err;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
870
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
871 // adjust size to end of file if necessary
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
872 if( l > node->size-pos )
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
873 l = node->size-pos;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
874
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
875 // adjust size to the amount of contiguous data we can see
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
876 // at present.
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
877 if( l > bsize )
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
878 l = bsize;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
879
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
880 // copy data out
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
881 memcpy( buf, fbuf, l );
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
882
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
883 // Update working vars
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
884 len -= l;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
885 buf += l;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
886 pos += l;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
887 resid -= l;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
888 }
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
889 }
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
890
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
891 // We successfully read some data
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
892 // Update the file offset and transfer residue.
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
893
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
894 uio->uio_resid = resid;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
895 fp->f_offset = pos;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
896
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
897 return ENOERR;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
898 }
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
899
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
900 // -------------------------------------------------------------------------
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
901 // romfs_fo_lseek()
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
902 // Seek to a new file position.
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
903
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
904 static int romfs_fo_lseek (struct CYG_FILE_TAG *fp, off_t *apos, int whence )
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
905 {
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
906 romfs_node *node = (romfs_node *)fp->f_data;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
907 off_t pos = *apos;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
908
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
909 switch( whence )
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
910 {
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
911 case SEEK_SET:
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
912 // Pos is already where we want to be.
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
913 break;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
914
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
915 case SEEK_CUR:
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
916 // Add pos to current offset.
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
917 pos += fp->f_offset;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
918 break;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
919
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
920 case SEEK_END:
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
921 // Add pos to file size.
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
922 pos += node->size;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
923 break;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
924
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
925 default:
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
926 return EINVAL;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
927 }
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
928
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
929 // Check that pos is still within current file size, or at the
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
930 // very end.
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
931 if( pos < 0 || pos > node->size )
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
932 return EINVAL;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
933
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
934 // All OK, set fp offset and return new position.
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
935 *apos = fp->f_offset = pos;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
936
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
937 return ENOERR;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
938 }
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
939
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
940 // -------------------------------------------------------------------------
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
941 // romfs_fo_ioctl()
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
942 // Handle ioctls. Currently none are defined.
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
943
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
944 static int romfs_fo_ioctl (struct CYG_FILE_TAG *fp, CYG_ADDRWORD com,
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
945 CYG_ADDRWORD data)
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
946 {
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
947 // No Ioctls currenly defined.
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
948
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
949 return EINVAL;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
950 }
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
951
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
952 // -------------------------------------------------------------------------
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
953 // romfs_fo_fsync().
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
954 // Force the file out to data storage.
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
955
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
956 static int romfs_fo_fsync (struct CYG_FILE_TAG *fp, int mode )
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
957 {
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
958 // Data is always permanently where it belongs, nothing to do
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
959 // here.
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
960
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
961 return ENOERR;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
962 }
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
963
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
964 // -------------------------------------------------------------------------
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
965 // romfs_fo_close()
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
966 // Close a file. We just clear out the data pointer.
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
967
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
968 static int romfs_fo_close (struct CYG_FILE_TAG *fp)
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
969 {
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
970 fp->f_data = 0; // zero data pointer
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
971
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
972 return ENOERR;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
973 }
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
974
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
975 // -------------------------------------------------------------------------
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
976 //romfs_fo_fstat()
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
977 // Get file status.
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
978
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
979 static int romfs_fo_fstat (struct CYG_FILE_TAG *fp, struct stat *buf )
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
980 {
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
981 romfs_node *node = (romfs_node *)fp->f_data;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
982 romfs_disk *disk = (romfs_disk*)(fp->f_mte->data);
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
983
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
984 // Fill in the status
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
985 buf->st_mode = node->mode;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
986 buf->st_ino = (ino_t)(node - &disk->node[0]);
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
987 buf->st_dev = disk->dev_id;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
988 buf->st_nlink = node->nlink;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
989 buf->st_uid = node->uid;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
990 buf->st_gid = node->gid;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
991 buf->st_size = node->size;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
992 buf->st_atime = node->ctime;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
993 buf->st_mtime = node->ctime;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
994 buf->st_ctime = node->ctime;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
995
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
996 return ENOERR;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
997 }
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
998
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
999 // -------------------------------------------------------------------------
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
1000 // romfs_fo_getinfo()
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
1001 // Get info. Currently only supports fpathconf().
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
1002
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
1003 static int romfs_fo_getinfo (struct CYG_FILE_TAG *fp, int key, void *buf, int len )
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
1004 {
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
1005 romfs_node *node = (romfs_node *)fp->f_data;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
1006 int err;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
1007
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
1008 switch( key )
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
1009 {
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
1010 case FS_INFO_CONF:
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents:
diff changeset
1011 err = romfs_pathconf( node, (struct cyg_pathconf_info *)buf );
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1012 break;
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1013
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1014 default:
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1015 err = EINVAL;
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1016 }
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diff changeset
1017 return err;
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diff changeset
1018 }
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diff changeset
1019
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1020 // -------------------------------------------------------------------------
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1021 // romfs_fo_setinfo()
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1022 // Set info. Nothing supported here.
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1023
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1024 static int romfs_fo_setinfo (struct CYG_FILE_TAG *fp, int key, void *buf, int len )
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1025 {
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diff changeset
1026 // No setinfo key supported at present
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diff changeset
1027
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1028 return ENOERR;
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parents:
diff changeset
1029 }
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diff changeset
1030
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diff changeset
1031
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diff changeset
1032 //==========================================================================
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diff changeset
1033 // Directory operations
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diff changeset
1034
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diff changeset
1035 // -------------------------------------------------------------------------
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diff changeset
1036 // romfs_fo_dirread()
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diff changeset
1037 // Read a single directory entry from a file.
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diff changeset
1038
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diff changeset
1039 static int romfs_fo_dirread (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio)
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diff changeset
1040 {
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diff changeset
1041 romfs_node *dir = (romfs_node *)fp->f_data;
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diff changeset
1042 off_t pos = fp->f_offset;
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diff changeset
1043 int err = ENOERR;
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diff changeset
1044 struct dirent *ent = (struct dirent *)uio->uio_iov[0].iov_base;
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diff changeset
1045 char *nbuf = ent->d_name;
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diff changeset
1046 int nlen = sizeof(ent->d_name)-1;
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diff changeset
1047 off_t len = uio->uio_iov[0].iov_len;
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diff changeset
1048 romfs_dirent *d = NULL;
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diff changeset
1049 cyg_uint8 *buf;
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diff changeset
1050 size_t size;
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diff changeset
1051 int i;
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diff changeset
1052
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diff changeset
1053 if( len < sizeof(struct dirent) )
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diff changeset
1054 return EINVAL;
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diff changeset
1055
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diff changeset
1056 // Get the next entry
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diff changeset
1057 err = findbuffer_node( (romfs_disk *)fp->f_mte->data, dir, pos, &buf, &size );
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1058 if( err != ENOERR || size == 0 || pos >= dir->size )
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diff changeset
1059 return err;
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diff changeset
1060
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diff changeset
1061 d = (romfs_dirent *)buf;
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diff changeset
1062
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diff changeset
1063 for ( i = 0 ; i < nlen && d->name[i] ; i++, nbuf++ )
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diff changeset
1064 *nbuf = d->name[i];
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diff changeset
1065
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diff changeset
1066 // A successful read. Terminate the entry name with a NUL, set the
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diff changeset
1067 // residue and set the file offset to restart at the next
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diff changeset
1068 // directory entry.
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diff changeset
1069
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diff changeset
1070 *nbuf = '\0';
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diff changeset
1071 uio->uio_resid -= sizeof(struct dirent);
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diff changeset
1072 fp->f_offset = d->next;
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diff changeset
1073
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diff changeset
1074 return ENOERR;
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diff changeset
1075 }
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diff changeset
1076
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diff changeset
1077 // -------------------------------------------------------------------------
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diff changeset
1078 // romfs_fo_dirlseek()
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parents:
diff changeset
1079 // Seek directory to start.
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diff changeset
1080
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diff changeset
1081 static int romfs_fo_dirlseek (struct CYG_FILE_TAG *fp, off_t *pos, int whence )
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diff changeset
1082 {
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diff changeset
1083 // Only allow SEEK_SET to zero
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diff changeset
1084
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diff changeset
1085 if( whence != SEEK_SET || *pos != 0)
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diff changeset
1086 return EINVAL;
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diff changeset
1087
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diff changeset
1088 *pos = fp->f_offset = 0;
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diff changeset
1089
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diff changeset
1090 return ENOERR;
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diff changeset
1091 }
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diff changeset
1092
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diff changeset
1093 // -------------------------------------------------------------------------
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diff changeset
1094 // EOF romfs.c