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2 | pj | 1 | /* |
2 | * Project: HARTIK (HA-rd R-eal TI-me K-ernel) |
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3 | * |
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4 | * Coordinators: Giorgio Buttazzo <giorgio@sssup.it> |
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5 | * Gerardo Lamastra <gerardo@sssup.it> |
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6 | * |
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7 | * Authors : Massimiliano Giorgi <massy@hartik.sssup.it> |
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8 | * (see authors.txt for full list of hartik's authors) |
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9 | * |
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10 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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11 | * |
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12 | * http://www.sssup.it |
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13 | * http://retis.sssup.it |
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14 | * http://hartik.sssup.it |
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15 | */ |
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16 | |||
17 | /* |
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18 | * Copyright (C) 1999 Massimiliano Giorgi |
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19 | * |
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20 | * This program is free software; you can redistribute it and/or modify |
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21 | * it under the terms of the GNU General Public License as published by |
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22 | * the Free Software Foundation; either version 2 of the License, or |
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23 | * (at your option) any later version. |
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24 | * |
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25 | * This program is distributed in the hope that it will be useful, |
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26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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28 | * GNU General Public License for more details. |
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29 | * |
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30 | * You should have received a copy of the GNU General Public License |
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31 | * along with this program; if not, write to the Free Software |
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32 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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33 | * |
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34 | */ |
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35 | |||
36 | /* |
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37 | * CVS : $Id: file.c,v 1.1.1.1 2002-03-29 14:12:50 pj Exp $ |
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38 | * |
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39 | * File: $File$ |
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40 | * Revision: $Revision: 1.1.1.1 $ |
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41 | * Last update: $Date: 2002-03-29 14:12:50 $ |
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42 | */ |
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43 | |||
44 | #include <fs/fsconf.h> |
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45 | #include <fs/util.h> |
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46 | #include <fs/types.h> |
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47 | #include <fs/fcntl.h> |
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48 | #include <fs/stat.h> |
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49 | #include <fs/errno.h> |
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50 | #include <fs/maccess.h> |
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51 | #include <fs/limits.h> |
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52 | #include <fs/task.h> |
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53 | |||
54 | #include "mutex.h" |
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55 | #include "fs.h" |
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56 | #include "file.h" |
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57 | #include "fsconst.h" |
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58 | #include "dentry.h" |
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59 | #include "fileop.h" |
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60 | #include "inode.h" |
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61 | #include "inodeop.h" |
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62 | |||
63 | #include "debug.h" |
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64 | |||
65 | /* OSKit stdio need this */ |
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66 | int getdtablesize(void) |
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67 | { |
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68 | return MAXOPENFILES; |
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69 | } |
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70 | |||
71 | /*-----------*/ |
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72 | |||
73 | //#if !defined GLOB_DESC_TABLE |
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74 | //#if !defined LOC_DESC_TABLE |
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75 | //#error "GLOB_DESC_TABLE or LOC_DESC_TABLE must be defined! (see fsconfig.h)" |
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76 | //#endif |
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77 | //#else |
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78 | //#if defined LOC_DESC_TABLE |
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79 | //#error "GLOB_DESC_TABLE and LOC_DESC_TABLE are defined! (see fsconfig.h)" |
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80 | //#endif |
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81 | //#endif |
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82 | |||
83 | /*-----------*/ |
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84 | |||
85 | //static __fs_mutex_t mutex; |
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86 | static __fs_mutex_t mutexreq; |
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87 | |||
88 | static struct file *freelist; |
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89 | static struct file filetab[MAXSYSFILE]; |
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90 | |||
91 | //#ifdef GLOB_DESC_TABLE |
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92 | //#include "fileg.inc" |
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93 | //#else |
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94 | //#include "filel.inc" |
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95 | //#endif |
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96 | |||
97 | struct file_descriptors desctable[MAXIMUMPROCESS]; |
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98 | |||
99 | int get_fd(__pid_t pid, struct file *f) |
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100 | { |
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101 | int i; |
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102 | lock_desctable(pid); |
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103 | for (i=0;i<MAXOPENFILES;i++) |
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104 | if (desctable[pid].fd_file[i]==NULL) { |
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105 | desctable[pid].fd_file[i]=f; |
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106 | desctable[pid].fd_file[i]->f_count=1; |
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107 | desctable[pid].fd_flags[i]=0; |
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108 | desctable[pid].fd_fflags[i]=0; |
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109 | unlock_desctable(pid); |
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110 | return i; |
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111 | } |
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112 | unlock_desctable(pid); |
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113 | return -1; |
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114 | } |
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115 | |||
116 | int __duplicate_fd(__pid_t pid, int fd, int low) |
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117 | { |
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118 | while (low<MAXOPENFILES) { |
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119 | if (desctable[pid].fd_file[low]==NULL) { |
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120 | desctable[pid].fd_file[low]=desctable[pid].fd_file[fd]; |
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121 | desctable[pid].fd_file[fd]->f_count++; |
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122 | return low; |
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123 | } |
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124 | low++; |
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125 | } |
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126 | return -1; |
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127 | } |
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128 | |||
129 | |||
130 | int __isvalid_fd(__pid_t pid, int fd) |
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131 | { |
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132 | return desctable[pid].fd_file[fd]!=NULL; |
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133 | } |
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134 | |||
135 | |||
136 | struct file *free_fd(__pid_t pid, int fd) |
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137 | { |
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138 | struct file *ret; |
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139 | lock_desctable(pid); |
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140 | ret=desctable[pid].fd_file[fd]; |
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141 | desctable[pid].fd_file[fd]=NULL; |
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142 | unlock_desctable(pid); |
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143 | return ret; |
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144 | } |
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145 | |||
146 | static int subfile_init(void) |
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147 | { |
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148 | int i,j; |
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149 | for (j=0;j<MAXIMUMPROCESS;j++) { |
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150 | |||
151 | strcpy(desctable[j].fd_cwd,ROOTDIRNAME); |
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152 | desctable[j].fd_cwden=get_root_dentry(); |
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153 | get_root_dentry()->d_lock++; |
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154 | desctable[j].fd_umask=__DEFUMASK; |
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155 | |||
156 | /* TO FIX : 0,1,2 are reserved file descriptors */ |
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157 | /* |
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158 | desctable[j].fd_file[0]=(void*)(-1); |
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159 | desctable[j].fd_flags[0]=0; |
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160 | desctable[j].fd_fflags[0]=0; |
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161 | desctable[j].fd_file[1]=(void*)(-1); |
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162 | desctable[j].fd_flags[1]=0; |
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163 | desctable[j].fd_fflags[1]=0; |
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164 | desctable[j].fd_file[2]=(void*)(-1); |
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165 | desctable[j].fd_flags[2]=0; |
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166 | desctable[j].fd_fflags[2]=0; |
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167 | */ |
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168 | for (i=0;i<MAXOPENFILES;i++) { |
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169 | desctable[j].fd_file[i]=NULL; |
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170 | desctable[j].fd_flags[i]=0; |
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171 | desctable[j].fd_fflags[i]=0; |
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172 | } |
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173 | |||
174 | |||
175 | init_mutex(j); |
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176 | } |
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177 | |||
178 | return 0; |
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179 | } |
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180 | |||
181 | /*-----------*/ |
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182 | |||
183 | /* |
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184 | * DANGER: must be called AFTER the mounting of the root device! |
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185 | * because the subfile_init() use get_root_dentry() |
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186 | */ |
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187 | |||
188 | int file_init(void) |
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189 | { |
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190 | int i; |
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191 | //__fs_mutex_init(&mutex); |
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192 | __fs_mutex_init(&mutexreq); |
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193 | freelist=filetab; |
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194 | for (i=0;i<MAXSYSFILE;i++) { |
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195 | memset(filetab+i,0,sizeof(struct file)); |
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196 | filetab[i].f_next=filetab+i+1; |
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197 | filetab[i].f_count=0; |
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198 | } |
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199 | filetab[MAXSYSFILE-1].f_next=NULL; |
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200 | |||
201 | return subfile_init(); |
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202 | } |
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203 | |||
204 | /**/ |
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205 | |||
206 | struct file *__get_file(void) |
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207 | { |
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208 | struct file *f; |
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209 | if (freelist==NULL) return NULL; |
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210 | f=freelist; |
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211 | freelist=f->f_next; |
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212 | _assert(f->f_count==0); |
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213 | f->f_count=1; |
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214 | return f; |
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215 | } |
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216 | |||
217 | /* get a file struct from the free queue */ |
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218 | struct file *get_file(struct inode *ptr) |
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219 | { |
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220 | /* NB: ptr is not used yet */ |
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221 | struct file *f; |
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222 | __fs_mutex_lock(&mutexreq); |
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223 | //cprintf("Û{"); |
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224 | f=__get_file(); |
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225 | __fs_mutex_unlock(&mutexreq); |
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226 | //cprintf("Û}"); |
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227 | return f; |
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228 | } |
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229 | |||
230 | /**/ |
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231 | |||
232 | static void __free_file(struct file *f) |
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233 | { |
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234 | _assert(f->f_count==1); |
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235 | f->f_count=0; |
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236 | f->f_next=freelist; |
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237 | freelist=f; |
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238 | } |
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239 | |||
240 | /* insert file struct into the free queue */ |
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241 | void free_file(struct file *f) |
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242 | { |
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243 | __fs_mutex_lock(&mutexreq); |
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244 | //cprintf("Û{"); |
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245 | __free_file(f); |
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246 | __fs_mutex_unlock(&mutexreq); |
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247 | //cprintf("Û}"); |
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248 | } |
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249 | |||
250 | /* enumerate all files */ |
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251 | void enums_file(void (*func)(struct file *)) |
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252 | { |
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253 | int i; |
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254 | __fs_mutex_lock(&mutexreq); |
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255 | //cprintf("Û{"); |
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256 | for (i=0;i<MAXSYSFILE;i++) |
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257 | if (filetab[i].f_count!=0) func(filetab+i); |
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258 | __fs_mutex_unlock(&mutexreq); |
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259 | //cprintf("Û}"); |
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260 | } |
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261 | |||
262 | |||
263 | /* |
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264 | * |
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265 | * DUMMY file operations |
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266 | * |
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267 | */ |
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268 | |||
269 | __off_t dummy_lseek(struct file *f, __off_t off, int whence) |
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270 | { |
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271 | return -ENOSYS; |
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272 | } |
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273 | |||
274 | __ssize_t dummy_read(struct file *f, char *p, __ssize_t d) |
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275 | { |
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276 | return -ENOSYS; |
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277 | } |
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278 | |||
279 | __ssize_t dummy_write(struct file *f, char *p, __ssize_t d) |
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280 | { |
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281 | return -ENOSYS; |
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282 | } |
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283 | |||
284 | int dummy_readdir(struct file *f, void *e) |
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285 | { |
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286 | return -ENOSYS; |
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287 | } |
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288 | |||
289 | int dummy_open(struct inode *i, struct file *f) |
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290 | { |
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291 | return -ENOSYS; |
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292 | } |
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293 | |||
294 | int dummy_close(struct inode *i, struct file *f) |
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295 | { |
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296 | return -ENOSYS; |
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297 | } |
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298 | |||
299 | /* |
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300 | * |
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301 | * for function inlines |
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302 | * |
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303 | * |
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304 | */ |
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305 | |||
306 | #ifdef MULTITHREAD |
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307 | |||
308 | void lock_desctable(__pid_t pid) |
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309 | { |
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310 | __mutex_lock(&desctable[pid].fd_mutex); |
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311 | } |
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312 | |||
313 | void unlock_desctable(__pid_t pid) |
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314 | { |
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315 | __mutex_unlock(&desctable[pid].fd_mutex); |
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316 | } |
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317 | |||
318 | void init_mutex(__pid_t pid) |
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319 | { |
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320 | __mutex_init(&desctable[pid].fd_mutex,fsmutexattr); |
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321 | } |
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322 | |||
323 | #else |
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324 | |||
325 | void lock_desctable(__pid_t pid) |
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326 | {} |
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327 | |||
328 | void unlock_desctable(__pid_t pid) |
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329 | {} |
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330 | |||
331 | void init_mutex(__pid_t pid) |
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332 | {} |
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333 | |||
334 | #endif |
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335 | |||
336 | __mode_t *umask_ptr(__pid_t pid) |
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337 | { |
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338 | return &desctable[pid].fd_umask; |
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339 | } |
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340 | |||
341 | char *cwd_ptr(__pid_t pid) |
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342 | { |
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343 | return desctable[pid].fd_cwd; |
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344 | } |
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345 | |||
346 | struct dentry *cwden_ptr(__pid_t pid) |
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347 | { |
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348 | return desctable[pid].fd_cwden; |
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349 | } |
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350 | |||
351 | struct file *file_ptr(__pid_t pid, int i) |
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352 | { |
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353 | return desctable[pid].fd_file[i]; |
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354 | } |
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355 | |||
356 | |||
357 | |||
358 | |||
359 | |||
360 |