1 | /* |
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2 | * vfs.c - Virtual File System implementation. |
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3 | * |
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4 | * Author Mohamed Lamine Karaoui (2015) |
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5 | * Alain Greiner (2016,2017) |
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6 | * |
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7 | * Copyright (c) UPMC Sorbonne Universites |
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8 | * |
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9 | * This file is part of ALMOS-MKH. |
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10 | * |
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11 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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12 | * under the terms of the GNU General Public License as published by |
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13 | * the Free Software Foundation; version 2.0 of the License. |
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14 | * |
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15 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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18 | * General Public License for more details. |
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19 | * |
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20 | * You should have received a copy of the GNU General Public License |
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21 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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22 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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23 | */ |
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24 | |
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25 | |
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26 | #include <kernel_config.h> |
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27 | #include <hal_types.h> |
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28 | #include <hal_atomic.h> |
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29 | #include <hal_special.h> |
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30 | #include <readlock.h> |
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31 | #include <spinlock.h> |
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32 | #include <printk.h> |
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33 | #include <list.h> |
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34 | #include <xlist.h> |
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35 | #include <slist.h> |
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36 | #include <xhtab.h> |
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37 | #include <string.h> |
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38 | #include <rpc.h> |
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39 | #include <errno.h> |
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40 | #include <kmem.h> |
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41 | #include <mapper.h> |
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42 | #include <thread.h> |
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43 | #include <chdev.h> |
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44 | #include <process.h> |
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45 | #include <vfs.h> |
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46 | #include <fatfs.h> |
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47 | #include <ramfs.h> |
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48 | #include <devfs.h> |
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49 | #include <syscalls.h> |
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50 | |
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51 | |
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52 | ////////////////////////////////////////////////////////////////////////////////////////// |
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53 | // Extern variables |
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54 | ////////////////////////////////////////////////////////////////////////////////////////// |
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55 | |
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56 | extern vfs_ctx_t fs_context[FS_TYPES_NR]; // allocated in kernel_init.c |
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57 | |
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58 | extern chdev_directory_t chdev_dir; // allocated in kernel_init.c |
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59 | |
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60 | ////////////////////////////////////////////////////////////////////////////////////////// |
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61 | // Context related functions |
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62 | ////////////////////////////////////////////////////////////////////////////////////////// |
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63 | |
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64 | //////////////////////////////////////// |
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65 | void vfs_ctx_init( vfs_fs_type_t type, |
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66 | uint32_t attr, |
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67 | uint32_t total_clusters, |
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68 | uint32_t cluster_size, |
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69 | xptr_t vfs_root_xp, |
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70 | void * extend ) |
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71 | { |
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72 | vfs_ctx_t * vfs_ctx = &fs_context[type]; |
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73 | |
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74 | vfs_ctx->type = type; |
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75 | vfs_ctx->attr = attr; |
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76 | vfs_ctx->total_clusters = total_clusters; |
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77 | vfs_ctx->cluster_size = cluster_size; |
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78 | vfs_ctx->vfs_root_xp = vfs_root_xp; |
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79 | vfs_ctx->extend = extend; |
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80 | |
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81 | spinlock_init( &vfs_ctx->lock ); |
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82 | |
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83 | bitmap_init( vfs_ctx->bitmap , BITMAP_SIZE(CONFIG_VFS_MAX_INODES) ); |
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84 | } |
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85 | |
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86 | //////////////////////////////////////////// |
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87 | error_t vfs_ctx_inum_alloc( vfs_ctx_t * ctx, |
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88 | uint32_t * inum ) |
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89 | { |
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90 | // get lock on inum allocator |
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91 | spinlock_lock( &ctx->lock ); |
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92 | |
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93 | // get lid from local inum allocator |
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94 | uint32_t lid = bitmap_ffc( ctx->bitmap , CONFIG_VFS_MAX_INODES ); |
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95 | |
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96 | if( lid == -1 ) // no more free slot => error |
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97 | { |
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98 | // release lock |
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99 | spinlock_unlock( &ctx->lock ); |
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100 | |
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101 | // return error |
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102 | return 1; |
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103 | } |
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104 | else // found => return inum |
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105 | { |
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106 | // set slot allocated |
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107 | bitmap_set( ctx->bitmap , lid ); |
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108 | |
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109 | // release lock |
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110 | spinlock_unlock( &ctx->lock ); |
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111 | |
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112 | // return inum |
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113 | *inum = (((uint32_t)local_cxy) << 16) | (lid & 0xFFFF); |
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114 | return 0; |
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115 | } |
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116 | } |
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117 | |
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118 | //////////////////////////////////////////// |
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119 | void vfs_ctx_inum_release( vfs_ctx_t * ctx, |
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120 | uint32_t inum ) |
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121 | { |
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122 | bitmap_clear( ctx->bitmap , inum & 0xFFFF ); |
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123 | } |
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124 | |
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125 | ////////////////////////////////////////////////////////////////////////////////////////// |
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126 | // Inode related functions |
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127 | ////////////////////////////////////////////////////////////////////////////////////////// |
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128 | |
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129 | char * vfs_inode_type_str( uint32_t type ) |
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130 | { |
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131 | if ( type == INODE_TYPE_FILE ) return "FILE"; |
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132 | else if( type == INODE_TYPE_DIR ) return "DIR "; |
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133 | else if( type == INODE_TYPE_FIFO ) return "FIFO"; |
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134 | else if( type == INODE_TYPE_PIPE ) return "PIPE"; |
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135 | else if( type == INODE_TYPE_SOCK ) return "SOCK"; |
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136 | else if( type == INODE_TYPE_DEV ) return "DEV "; |
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137 | else if( type == INODE_TYPE_SYML ) return "SYML"; |
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138 | else return "undefined"; |
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139 | } |
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140 | |
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141 | ////////////////////////////////////////////////////// |
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142 | error_t vfs_inode_create( xptr_t dentry_xp, |
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143 | vfs_fs_type_t fs_type, |
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144 | vfs_inode_type_t inode_type, |
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145 | void * extend, |
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146 | uint32_t attr, |
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147 | uint32_t rights, |
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148 | uid_t uid, |
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149 | gid_t gid, |
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150 | xptr_t * inode_xp ) |
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151 | { |
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152 | mapper_t * mapper; // associated mapper( to be allocated) |
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153 | vfs_inode_t * inode; // inode descriptor (to be allocated) |
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154 | uint32_t inum; // inode identifier (to be allocated) |
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155 | vfs_ctx_t * ctx; // file system context |
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156 | kmem_req_t req; // request to kernel memory allocator |
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157 | error_t error; |
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158 | |
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159 | #if CONFIG_DEBUG_VFS_INODE_CREATE |
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160 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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161 | if( CONFIG_DEBUG_VFS_INODE_CREATE < cycle ) |
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162 | printk("\n[DBG] %s : thread %x enter / dentry = %x in cluster %x / cycle %d\n", |
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163 | __FUNCTION__, CURRENT_THREAD, GET_PTR(dentry_xp), GET_CXY(dentry_xp), cycle ); |
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164 | #endif |
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165 | |
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166 | // check fs type and get pointer on context |
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167 | if ( fs_type == FS_TYPE_FATFS ) ctx = &fs_context[FS_TYPE_FATFS]; |
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168 | else if( fs_type == FS_TYPE_RAMFS ) ctx = &fs_context[FS_TYPE_RAMFS]; |
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169 | else if( fs_type == FS_TYPE_DEVFS ) ctx = &fs_context[FS_TYPE_DEVFS]; |
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170 | else |
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171 | { |
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172 | ctx = NULL; |
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173 | assert( false , __FUNCTION__ , "illegal file system type = %d\n" , fs_type ); |
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174 | } |
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175 | |
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176 | // allocate inum |
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177 | error = vfs_ctx_inum_alloc( ctx , &inum ); |
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178 | |
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179 | if( error ) |
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180 | { |
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181 | printk("\n[ERROR] in %s : cannot allocate inum\n", __FUNCTION__ ); |
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182 | return ENOMEM; |
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183 | } |
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184 | |
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185 | // allocate memory for mapper |
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186 | mapper = mapper_create( fs_type ); |
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187 | |
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188 | if( mapper == NULL ) |
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189 | { |
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190 | printk("\n[ERROR] in %s : cannot allocate mapper\n", __FUNCTION__ ); |
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191 | vfs_ctx_inum_release( ctx , inum ); |
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192 | return ENOMEM; |
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193 | } |
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194 | |
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195 | // allocate memory for VFS inode descriptor |
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196 | req.type = KMEM_VFS_INODE; |
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197 | req.size = sizeof(vfs_inode_t); |
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198 | req.flags = AF_KERNEL | AF_ZERO; |
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199 | inode = (vfs_inode_t *)kmem_alloc( &req ); |
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200 | |
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201 | if( inode == NULL ) |
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202 | { |
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203 | printk("\n[ERROR] in %s : cannot allocate inode descriptor\n", __FUNCTION__ ); |
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204 | vfs_ctx_inum_release( ctx , inum ); |
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205 | mapper_destroy( mapper ); |
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206 | return ENOMEM; |
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207 | } |
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208 | |
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209 | // initialize inode descriptor |
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210 | inode->gc = 0; |
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211 | inode->type = inode_type; |
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212 | inode->inum = inum; |
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213 | inode->attr = attr; |
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214 | inode->rights = rights; |
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215 | inode->uid = uid; |
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216 | inode->gid = gid; |
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217 | inode->refcount = 0; |
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218 | inode->parent_xp = dentry_xp; |
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219 | inode->ctx = ctx; |
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220 | inode->mapper = mapper; |
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221 | inode->extend = extend; |
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222 | |
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223 | // initialise inode field in mapper |
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224 | mapper->inode = inode; |
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225 | |
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226 | // initialise threads waiting queue |
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227 | xlist_root_init( XPTR( local_cxy , &inode->wait_root ) ); |
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228 | |
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229 | // initialize dentries hash table |
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230 | xhtab_init( &inode->children , XHTAB_DENTRY_TYPE ); |
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231 | |
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232 | // initialize inode locks |
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233 | remote_rwlock_init( XPTR( local_cxy , &inode->data_lock ) ); |
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234 | remote_spinlock_init( XPTR( local_cxy , &inode->main_lock ) ); |
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235 | |
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236 | #if CONFIG_DEBUG_VFS_INODE_CREATE |
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237 | cycle = (uint32_t)hal_get_cycles(); |
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238 | if( CONFIG_DEBUG_VFS_INODE_CREATE < cycle ) |
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239 | printk("\n[DBG] %s : thread %x exit / inode = %x in cluster %x / cycle %d\n", |
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240 | __FUNCTION__, CURRENT_THREAD, inode, local_cxy, cycle ); |
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241 | #endif |
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242 | |
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243 | // return extended pointer on inode |
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244 | *inode_xp = XPTR( local_cxy , inode ); |
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245 | return 0; |
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246 | |
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247 | } // end vfs_inode_create() |
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248 | |
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249 | ///////////////////////////////////////////// |
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250 | void vfs_inode_destroy( vfs_inode_t * inode ) |
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251 | { |
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252 | if( inode->refcount ) |
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253 | { |
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254 | assert( false , __FUNCTION__ , "inode refcount non zero\n" ); |
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255 | } |
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256 | |
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257 | // release memory allocated for mapper |
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258 | mapper_destroy( inode->mapper ); |
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259 | |
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260 | // release memory allocate for inode descriptor |
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261 | kmem_req_t req; |
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262 | req.ptr = inode; |
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263 | req.type = KMEM_VFS_INODE; |
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264 | kmem_free( &req ); |
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265 | |
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266 | } // end vfs_inode_destroy() |
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267 | |
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268 | ///////////////////////////////////////////// |
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269 | error_t vfs_inode_load( vfs_inode_t * parent, |
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270 | char * name, |
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271 | xptr_t child_xp ) |
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272 | { |
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273 | |
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274 | #if CONFIG_DEBUG_VFS_INODE_LOAD |
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275 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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276 | if( CONFIG_DEBUG_VFS_INODE_LOAD < cycle ) |
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277 | printk("\n[DBG] %s : thread %x enter for <%s> / cycle %d\n", |
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278 | __FUNCTION__, CURRENT_THREAD , name , cycle ); |
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279 | #endif |
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280 | |
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281 | error_t error = 0; |
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282 | |
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283 | assert( (parent != NULL) , __FUNCTION__ , "parent pointer is NULL\n"); |
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284 | |
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285 | assert( (child_xp != XPTR_NULL) , __FUNCTION__ , "child pointer is NULL\n"); |
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286 | |
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287 | // get parent inode FS type |
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288 | vfs_fs_type_t fs_type = parent->ctx->type; |
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289 | |
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290 | // call relevant FS function |
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291 | if( fs_type == FS_TYPE_FATFS ) |
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292 | { |
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293 | error = fatfs_inode_load( parent , name , child_xp ); |
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294 | } |
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295 | else if( fs_type == FS_TYPE_RAMFS ) |
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296 | { |
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297 | assert( false , __FUNCTION__ , "should not be called for RAMFS\n" ); |
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298 | } |
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299 | else if( fs_type == FS_TYPE_DEVFS ) |
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300 | { |
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301 | assert( false , __FUNCTION__ , "should not be called for DEVFS\n" ); |
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302 | } |
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303 | else |
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304 | { |
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305 | assert( false , __FUNCTION__ , "undefined file system type\n" ); |
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306 | } |
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307 | |
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308 | #if CONFIG_DEBUG_VFS_INODE_LOAD |
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309 | cycle = (uint32_t)hal_get_cycles(); |
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310 | if( CONFIG_DEBUG_VFS_INODE_LOAD < cycle ) |
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311 | printk("\n[DBG] %s : thread %x exit for <%s> / cycle %d\n", |
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312 | __FUNCTION__, CURRENT_THREAD , name , cycle ); |
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313 | #endif |
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314 | |
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315 | return error; |
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316 | |
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317 | } // end vfs_load_inode() |
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318 | |
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319 | //////////////////////////////////////////// |
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320 | void vfs_inode_remote_up( xptr_t inode_xp ) |
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321 | { |
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322 | // get inode cluster and local pointer |
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323 | cxy_t inode_cxy = GET_CXY( inode_xp ); |
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324 | vfs_inode_t * inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp ); |
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325 | |
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326 | hal_remote_atomic_add( XPTR( inode_cxy , &inode_ptr->refcount ) , 1 ); |
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327 | } |
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328 | |
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329 | ////////////////////////////////////////////// |
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330 | void vfs_inode_remote_down( xptr_t inode_xp ) |
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331 | { |
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332 | // get inode cluster and local pointer |
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333 | cxy_t inode_cxy = GET_CXY( inode_xp ); |
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334 | vfs_inode_t * inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp ); |
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335 | |
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336 | hal_remote_atomic_add( XPTR( inode_cxy , &inode_ptr->refcount ) , -1 ); |
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337 | } |
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338 | |
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339 | ////////////////////////////////////////////// |
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340 | uint32_t vfs_inode_get_size( xptr_t inode_xp ) |
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341 | { |
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342 | // get inode cluster and local pointer |
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343 | cxy_t cxy = GET_CXY( inode_xp ); |
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344 | vfs_inode_t * ptr = (vfs_inode_t *)GET_PTR( inode_xp ); |
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345 | |
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346 | // get size |
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347 | remote_rwlock_rd_lock( XPTR( cxy , &ptr->data_lock ) ); |
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348 | uint32_t size = hal_remote_lw( XPTR( cxy , &ptr->size ) ); |
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349 | remote_rwlock_rd_unlock( XPTR( cxy , &ptr->data_lock ) ); |
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350 | return size; |
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351 | } |
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352 | |
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353 | //////////////////////////////////////////// |
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354 | void vfs_inode_set_size( xptr_t inode_xp, |
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355 | uint32_t size ) |
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356 | { |
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357 | // get inode cluster and local pointer |
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358 | cxy_t cxy = GET_CXY( inode_xp ); |
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359 | vfs_inode_t * ptr = (vfs_inode_t *)GET_PTR( inode_xp ); |
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360 | |
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361 | // set size |
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362 | remote_rwlock_wr_unlock( XPTR( cxy , &ptr->data_lock ) ); |
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363 | hal_remote_sw( XPTR( cxy , &ptr->size ) , size ); |
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364 | remote_rwlock_wr_unlock( XPTR( cxy , &ptr->data_lock ) ); |
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365 | } |
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366 | |
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367 | //////////////////////////////////////// |
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368 | void vfs_inode_unlock( xptr_t inode_xp ) |
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369 | { |
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370 | // get inode cluster and local pointer |
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371 | cxy_t cxy = GET_CXY( inode_xp ); |
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372 | vfs_inode_t * ptr = (vfs_inode_t *)GET_PTR( inode_xp ); |
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373 | |
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374 | // release the main lock |
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375 | remote_spinlock_unlock( XPTR( cxy , &ptr->main_lock ) ); |
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376 | } |
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377 | |
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378 | ////////////////////////////////////// |
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379 | void vfs_inode_lock( xptr_t inode_xp ) |
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380 | { |
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381 | // get inode cluster and local pointer |
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382 | cxy_t cxy = GET_CXY( inode_xp ); |
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383 | vfs_inode_t * ptr = (vfs_inode_t *)GET_PTR( inode_xp ); |
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384 | |
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385 | // get the main lock |
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386 | remote_spinlock_lock( XPTR( cxy , &ptr->main_lock ) ); |
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387 | } |
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388 | |
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389 | ///////////////////////////////////////// |
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390 | void vfs_inode_get_name( xptr_t inode_xp, |
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391 | char * name ) |
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392 | { |
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393 | cxy_t inode_cxy; |
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394 | vfs_inode_t * inode_ptr; |
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395 | xptr_t dentry_xp; |
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396 | cxy_t dentry_cxy; |
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397 | vfs_dentry_t * dentry_ptr; |
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398 | |
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399 | // get inode cluster and local pointer |
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400 | inode_cxy = GET_CXY( inode_xp ); |
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401 | inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp ); |
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402 | |
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403 | // get parent dentry |
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404 | dentry_xp = hal_remote_lwd( XPTR( inode_cxy , &inode_ptr->parent_xp ) ); |
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405 | |
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406 | // get local copy of name |
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407 | if( dentry_xp == XPTR_NULL ) // it is the VFS root |
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408 | { |
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409 | strcpy( name , "/" ); |
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410 | } |
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411 | else // not the VFS root |
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412 | { |
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413 | dentry_cxy = GET_CXY( dentry_xp ); |
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414 | dentry_ptr = (vfs_dentry_t *)GET_PTR( dentry_xp ); |
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415 | |
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416 | hal_remote_strcpy( XPTR( local_cxy , name ) , |
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417 | XPTR( dentry_cxy , &dentry_ptr->name ) ); |
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418 | } |
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419 | } // end vfs_inode_get_name() |
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420 | |
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421 | //////////////////////////////////////////////////////////////////////////////////////////// |
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422 | // Dentry related functions |
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423 | ////////////////////////////////////////////////////////////////////////////////////////// |
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424 | |
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425 | /////////////////////////////////////////////////// |
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426 | error_t vfs_dentry_create( vfs_fs_type_t fs_type, |
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427 | char * name, |
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428 | vfs_inode_t * parent, |
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429 | xptr_t * dentry_xp ) |
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430 | { |
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431 | vfs_ctx_t * ctx; // context descriptor |
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432 | vfs_dentry_t * dentry; // dentry descriptor (to be allocated) |
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433 | kmem_req_t req; // request to kernel memory allocator |
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434 | |
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435 | #if CONFIG_DEBUG_VFS_DENTRY_CREATE |
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436 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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437 | if( CONFIG_DEBUG_VFS_DENTRY_CREATE < cycle ) |
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438 | printk("\n[DBG] %s : thread %x enter for <%s> / parent_inode %x / cycle %d\n", |
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439 | __FUNCTION__, CURRENT_THREAD , name , parent , cycle ); |
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440 | #endif |
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441 | |
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442 | // get pointer on context |
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443 | if ( fs_type == FS_TYPE_FATFS ) ctx = &fs_context[FS_TYPE_FATFS]; |
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444 | else if( fs_type == FS_TYPE_RAMFS ) ctx = &fs_context[FS_TYPE_RAMFS]; |
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445 | else if( fs_type == FS_TYPE_DEVFS ) ctx = &fs_context[FS_TYPE_DEVFS]; |
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446 | else |
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447 | { |
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448 | ctx = NULL; |
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449 | assert( false , __FUNCTION__ , "undefined file system type\n" ); |
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450 | } |
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451 | |
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452 | // get name length |
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453 | uint32_t length = strlen( name ); |
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454 | |
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455 | if( length >= CONFIG_VFS_MAX_NAME_LENGTH ) |
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456 | { |
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457 | printk("\n[ERROR] in %s : name too long\n", __FUNCTION__ ); |
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458 | return EINVAL; |
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459 | } |
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460 | |
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461 | // allocate memory for dentry descriptor |
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462 | req.type = KMEM_VFS_DENTRY; |
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463 | req.size = sizeof(vfs_dentry_t); |
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464 | req.flags = AF_KERNEL | AF_ZERO; |
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465 | dentry = (vfs_dentry_t *)kmem_alloc( &req ); |
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466 | |
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467 | if( dentry == NULL ) |
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468 | { |
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469 | printk("\n[ERROR] in %s : cannot allocate dentry descriptor\n", __FUNCTION__ ); |
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470 | return ENOMEM; |
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471 | } |
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472 | |
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473 | // initialize dentry descriptor |
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474 | |
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475 | dentry->ctx = ctx; |
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476 | dentry->length = length; |
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477 | dentry->parent = parent; |
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478 | strcpy( dentry->name , name ); |
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479 | |
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480 | // register dentry in hash table rooted in parent inode |
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481 | xhtab_insert( XPTR( local_cxy , &parent->children ), |
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482 | name, |
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483 | XPTR( local_cxy , &dentry->list ) ); |
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484 | |
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485 | // return extended pointer on dentry |
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486 | *dentry_xp = XPTR( local_cxy , dentry ); |
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487 | |
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488 | #if CONFIG_DEBUG_VFS_DENTRY_CREATE |
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489 | cycle = (uint32_t)hal_get_cycles(); |
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490 | if( CONFIG_DEBUG_VFS_DENTRY_CREATE < cycle ) |
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491 | printk("\n[DBG] %s : thread %x exit for <%s> / dentry %x / cycle %d\n", |
---|
492 | __FUNCTION__, CURRENT_THREAD , name , dentry , cycle ); |
---|
493 | #endif |
---|
494 | |
---|
495 | return 0; |
---|
496 | |
---|
497 | } // end vfs_dentry_create() |
---|
498 | |
---|
499 | //////////////////////////////////////////////// |
---|
500 | void vfs_dentry_destroy( vfs_dentry_t * dentry ) |
---|
501 | { |
---|
502 | if( dentry->refcount ) |
---|
503 | { |
---|
504 | assert( false , __FUNCTION__ , "dentry refcount non zero\n" ); |
---|
505 | } |
---|
506 | |
---|
507 | kmem_req_t req; |
---|
508 | req.ptr = dentry; |
---|
509 | req.type = KMEM_VFS_DENTRY; |
---|
510 | kmem_free( &req ); |
---|
511 | } |
---|
512 | |
---|
513 | |
---|
514 | |
---|
515 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
516 | // File descriptor related functions |
---|
517 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
518 | |
---|
519 | ///////////////////////////////////////////// |
---|
520 | error_t vfs_file_create( vfs_inode_t * inode, |
---|
521 | uint32_t attr, |
---|
522 | xptr_t * file_xp ) |
---|
523 | { |
---|
524 | vfs_file_t * file; |
---|
525 | kmem_req_t req; |
---|
526 | |
---|
527 | // allocate memory for new file descriptor |
---|
528 | req.type = KMEM_VFS_FILE; |
---|
529 | req.size = sizeof(vfs_file_t); |
---|
530 | req.flags = AF_KERNEL | AF_ZERO; |
---|
531 | file = (vfs_file_t *)kmem_alloc( &req ); |
---|
532 | |
---|
533 | if( file == NULL ) return ENOMEM; |
---|
534 | |
---|
535 | // initializes new file descriptor |
---|
536 | file->gc = 0; |
---|
537 | file->type = inode->type; |
---|
538 | file->attr = attr; |
---|
539 | file->offset = 0; |
---|
540 | file->refcount = 1; |
---|
541 | file->inode = inode; |
---|
542 | file->ctx = inode->ctx; |
---|
543 | file->mapper = inode->mapper; |
---|
544 | |
---|
545 | remote_rwlock_init( XPTR( local_cxy , &file->lock ) ); |
---|
546 | |
---|
547 | *file_xp = XPTR( local_cxy , file ); |
---|
548 | return 0; |
---|
549 | |
---|
550 | } // end vfs_file_create() |
---|
551 | |
---|
552 | /////////////////////////////////////////// |
---|
553 | void vfs_file_destroy( vfs_file_t * file ) |
---|
554 | { |
---|
555 | if( file->refcount ) |
---|
556 | { |
---|
557 | assert( false , __FUNCTION__ , "refcount non zero\n" ); |
---|
558 | } |
---|
559 | |
---|
560 | kmem_req_t req; |
---|
561 | req.ptr = file; |
---|
562 | req.type = KMEM_VFS_FILE; |
---|
563 | kmem_free( &req ); |
---|
564 | |
---|
565 | } // end vfs_file_destroy() |
---|
566 | |
---|
567 | |
---|
568 | //////////////////////////////////////// |
---|
569 | void vfs_file_count_up( xptr_t file_xp ) |
---|
570 | { |
---|
571 | // get file cluster and local pointer |
---|
572 | cxy_t file_cxy = GET_CXY( file_xp ); |
---|
573 | vfs_file_t * file_ptr = (vfs_file_t *)GET_PTR( file_xp ); |
---|
574 | |
---|
575 | // atomically increment count |
---|
576 | hal_remote_atomic_add( XPTR( file_cxy , &file_ptr->refcount ) , 1 ); |
---|
577 | } |
---|
578 | |
---|
579 | ////////////////////////////////////////// |
---|
580 | void vfs_file_count_down( xptr_t file_xp ) |
---|
581 | { |
---|
582 | // get file cluster and local pointer |
---|
583 | cxy_t file_cxy = GET_CXY( file_xp ); |
---|
584 | vfs_file_t * file_ptr = (vfs_file_t *)GET_PTR( file_xp ); |
---|
585 | |
---|
586 | // atomically decrement count |
---|
587 | hal_remote_atomic_add( XPTR( file_cxy , &file_ptr->refcount ) , -1 ); |
---|
588 | } |
---|
589 | |
---|
590 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
591 | // File access related functions |
---|
592 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
593 | |
---|
594 | ////////////////////////////////////// |
---|
595 | error_t vfs_open( process_t * process, |
---|
596 | char * path, |
---|
597 | uint32_t flags, |
---|
598 | uint32_t mode, |
---|
599 | xptr_t * new_file_xp, |
---|
600 | uint32_t * new_file_id ) |
---|
601 | { |
---|
602 | error_t error; |
---|
603 | xptr_t inode_xp; // extended pointer on target inode |
---|
604 | cxy_t inode_cxy; // inode cluster identifier |
---|
605 | vfs_inode_t * inode_ptr; // inode local pointer |
---|
606 | uint32_t file_attr; // file descriptor attributes |
---|
607 | uint32_t lookup_mode; // lookup working mode |
---|
608 | xptr_t file_xp; // extended pointer on created file descriptor |
---|
609 | uint32_t file_id; // created file descriptor index in reference fd_array |
---|
610 | |
---|
611 | #if CONFIG_DEBUG_VFS_OPEN |
---|
612 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
613 | if( CONFIG_DEBUG_VFS_OPEN < cycle ) |
---|
614 | printk("\n[DBG] %s : thread %x enter for <%s> / cycle %d\n", |
---|
615 | __FUNCTION__, CURRENT_THREAD, path, cycle ); |
---|
616 | #endif |
---|
617 | |
---|
618 | // compute lookup working mode |
---|
619 | lookup_mode = VFS_LOOKUP_OPEN; |
---|
620 | if( (flags & O_DIR ) ) lookup_mode |= VFS_LOOKUP_DIR; |
---|
621 | if( (flags & O_CREAT ) ) lookup_mode |= VFS_LOOKUP_CREATE; |
---|
622 | if( (flags & O_EXCL ) ) lookup_mode |= VFS_LOOKUP_EXCL; |
---|
623 | |
---|
624 | // compute attributes for the created file |
---|
625 | file_attr = 0; |
---|
626 | if( (flags & O_RDONLY ) == 0 ) file_attr |= FD_ATTR_WRITE_ENABLE; |
---|
627 | if( (flags & O_WRONLY ) == 0 ) file_attr |= FD_ATTR_READ_ENABLE; |
---|
628 | if( (flags & O_SYNC ) ) file_attr |= FD_ATTR_SYNC; |
---|
629 | if( (flags & O_APPEND ) ) file_attr |= FD_ATTR_APPEND; |
---|
630 | if( (flags & O_CLOEXEC) ) file_attr |= FD_ATTR_CLOSE_EXEC; |
---|
631 | |
---|
632 | // get extended pointer on target inode |
---|
633 | error = vfs_lookup( process->vfs_cwd_xp , path , lookup_mode , &inode_xp ); |
---|
634 | |
---|
635 | if( error ) return error; |
---|
636 | |
---|
637 | // get target inode cluster and local pointer |
---|
638 | inode_cxy = GET_CXY( inode_xp ); |
---|
639 | inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp ); |
---|
640 | |
---|
641 | // create a new file descriptor in cluster containing inode |
---|
642 | if( inode_cxy == local_cxy ) // target cluster is local |
---|
643 | { |
---|
644 | error = vfs_file_create( inode_ptr , file_attr , &file_xp ); |
---|
645 | } |
---|
646 | else // target cluster is remote |
---|
647 | { |
---|
648 | rpc_vfs_file_create_client( inode_cxy , inode_ptr , file_attr , &file_xp , &error ); |
---|
649 | } |
---|
650 | |
---|
651 | if( error ) return error; |
---|
652 | |
---|
653 | // allocate and register a new file descriptor index in reference process |
---|
654 | error = process_fd_register( process , file_xp , &file_id ); |
---|
655 | |
---|
656 | if( error ) return error; |
---|
657 | |
---|
658 | #if CONFIG_DEBUG_VFS_OPEN |
---|
659 | cycle = (uint32_t)hal_get_cycles(); |
---|
660 | if( CONFIG_DEBUG_VFS_OPEN < cycle ) |
---|
661 | printk("\n[DBG] %s : thread %x exit for <%s> / file %x in cluster %x / cycle %d\n", |
---|
662 | __FUNCTION__, CURRENT_THREAD, path, GET_PTR(file_xp), GET_CXY(file_xp), cycle ); |
---|
663 | #endif |
---|
664 | |
---|
665 | // success |
---|
666 | *new_file_xp = file_xp; |
---|
667 | *new_file_id = file_id; |
---|
668 | return 0; |
---|
669 | |
---|
670 | } // end vfs_open() |
---|
671 | |
---|
672 | ////////////////////////////////////// |
---|
673 | int vfs_user_move( bool_t to_buffer, |
---|
674 | xptr_t file_xp, |
---|
675 | void * buffer, |
---|
676 | uint32_t size ) |
---|
677 | { |
---|
678 | assert( ( file_xp != XPTR_NULL ) , __FUNCTION__ , "file_xp == XPTR_NULL" ); |
---|
679 | |
---|
680 | cxy_t file_cxy; // remote file descriptor cluster |
---|
681 | vfs_file_t * file_ptr; // remote file descriptor local pointer |
---|
682 | vfs_inode_type_t inode_type; |
---|
683 | uint32_t file_offset; // current offset in file |
---|
684 | mapper_t * mapper; |
---|
685 | error_t error; |
---|
686 | |
---|
687 | // get cluster and local pointer on remote file descriptor |
---|
688 | file_cxy = GET_CXY( file_xp ); |
---|
689 | file_ptr = (vfs_file_t *)GET_PTR( file_xp ); |
---|
690 | |
---|
691 | // get inode type from remote file descriptor |
---|
692 | inode_type = hal_remote_lw( XPTR( file_cxy , &file_ptr->type ) ); |
---|
693 | |
---|
694 | assert( (inode_type == INODE_TYPE_FILE) , __FUNCTION__ , |
---|
695 | "inode type is not INODE_TYPE_FILE" ); |
---|
696 | |
---|
697 | // get mapper pointer and file offset from file descriptor |
---|
698 | file_offset = hal_remote_lw( XPTR( file_cxy , &file_ptr->offset ) ); |
---|
699 | mapper = (mapper_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->mapper ) ); |
---|
700 | |
---|
701 | // move data between mapper and buffer |
---|
702 | if( file_cxy == local_cxy ) |
---|
703 | { |
---|
704 | error = mapper_move_user( mapper, |
---|
705 | to_buffer, |
---|
706 | file_offset, |
---|
707 | buffer, |
---|
708 | size ); |
---|
709 | } |
---|
710 | else |
---|
711 | { |
---|
712 | rpc_mapper_move_buffer_client( file_cxy, |
---|
713 | mapper, |
---|
714 | to_buffer, |
---|
715 | true, // user buffer |
---|
716 | file_offset, |
---|
717 | (uint64_t)(intptr_t)buffer, |
---|
718 | size, |
---|
719 | &error ); |
---|
720 | } |
---|
721 | |
---|
722 | if( error ) return -1; |
---|
723 | else return size; |
---|
724 | |
---|
725 | } // end vfs_user_move() |
---|
726 | |
---|
727 | //////////////////////////////////////////// |
---|
728 | error_t vfs_kernel_move( bool_t to_buffer, |
---|
729 | xptr_t file_xp, |
---|
730 | xptr_t buffer_xp, |
---|
731 | uint32_t size ) |
---|
732 | { |
---|
733 | assert( ( file_xp != XPTR_NULL ) , __FUNCTION__ , "file_xp == XPTR_NULL" ); |
---|
734 | |
---|
735 | cxy_t file_cxy; // remote file descriptor cluster |
---|
736 | vfs_file_t * file_ptr; // remote file descriptor local pointer |
---|
737 | vfs_inode_type_t inode_type; |
---|
738 | uint32_t file_offset; // current offset in file |
---|
739 | mapper_t * mapper; |
---|
740 | error_t error; |
---|
741 | |
---|
742 | // get cluster and local pointer on remote file descriptor |
---|
743 | file_cxy = GET_CXY( file_xp ); |
---|
744 | file_ptr = (vfs_file_t *)GET_PTR( file_xp ); |
---|
745 | |
---|
746 | // get inode type from remote file descriptor |
---|
747 | inode_type = hal_remote_lw( XPTR( file_cxy , &file_ptr->type ) ); |
---|
748 | |
---|
749 | // action depends on inode type |
---|
750 | if( inode_type == INODE_TYPE_FILE ) |
---|
751 | { |
---|
752 | // get mapper pointer and file offset from file descriptor |
---|
753 | file_offset = hal_remote_lw( XPTR( file_cxy , &file_ptr->offset ) ); |
---|
754 | mapper = (mapper_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->mapper ) ); |
---|
755 | |
---|
756 | // move data between mapper and buffer |
---|
757 | if( file_cxy == local_cxy ) |
---|
758 | { |
---|
759 | error = mapper_move_kernel( mapper, |
---|
760 | to_buffer, |
---|
761 | file_offset, |
---|
762 | buffer_xp, |
---|
763 | size ); |
---|
764 | } |
---|
765 | else |
---|
766 | { |
---|
767 | rpc_mapper_move_buffer_client( file_cxy, |
---|
768 | mapper, |
---|
769 | to_buffer, |
---|
770 | false, // kernel buffer |
---|
771 | file_offset, |
---|
772 | buffer_xp, |
---|
773 | size, |
---|
774 | &error ); |
---|
775 | } |
---|
776 | |
---|
777 | if( error ) return -1; |
---|
778 | else return 0; |
---|
779 | } |
---|
780 | else |
---|
781 | { |
---|
782 | printk("\n[ERROR] in %s : inode is not a file", __FUNCTION__ ); |
---|
783 | return -1; |
---|
784 | } |
---|
785 | } // end vfs_kernel_move() |
---|
786 | |
---|
787 | ////////////////////////////////////// |
---|
788 | error_t vfs_lseek( xptr_t file_xp, |
---|
789 | uint32_t offset, |
---|
790 | uint32_t whence, |
---|
791 | uint32_t * new_offset ) |
---|
792 | { |
---|
793 | xptr_t offset_xp; |
---|
794 | xptr_t lock_xp; |
---|
795 | cxy_t file_cxy; |
---|
796 | vfs_file_t * file_ptr; |
---|
797 | vfs_inode_t * inode_ptr; |
---|
798 | uint32_t new; |
---|
799 | |
---|
800 | assert( (file_xp != XPTR_NULL) , __FUNCTION__ , "file_xp == XPTR_NULL" ); |
---|
801 | |
---|
802 | // get cluster and local pointer on remote file descriptor |
---|
803 | file_cxy = GET_CXY( file_xp ); |
---|
804 | file_ptr = (vfs_file_t *)GET_PTR( file_xp ); |
---|
805 | |
---|
806 | // build extended pointers on lock and offset |
---|
807 | offset_xp = XPTR( file_cxy , &file_ptr->offset ); |
---|
808 | lock_xp = XPTR( file_cxy , &file_ptr->lock ); |
---|
809 | |
---|
810 | // take file descriptor lock |
---|
811 | remote_rwlock_wr_lock( lock_xp ); |
---|
812 | |
---|
813 | if ( whence == SEEK_CUR ) // new = current + offset |
---|
814 | { |
---|
815 | new = hal_remote_lw( offset_xp ) + offset; |
---|
816 | } |
---|
817 | else if ( whence == SEEK_SET ) // new = offset |
---|
818 | { |
---|
819 | new = offset; |
---|
820 | } |
---|
821 | else if ( whence == SEEK_END ) // new = size + offset |
---|
822 | { |
---|
823 | // get local pointer on remote inode |
---|
824 | inode_ptr = (vfs_inode_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) ); |
---|
825 | |
---|
826 | new = hal_remote_lw( XPTR( file_cxy , &inode_ptr->size ) ) + offset; |
---|
827 | } |
---|
828 | else |
---|
829 | { |
---|
830 | printk("\n[ERROR] in %s : illegal whence value\n", __FUNCTION__ ); |
---|
831 | remote_rwlock_wr_unlock( lock_xp ); |
---|
832 | return -1; |
---|
833 | } |
---|
834 | |
---|
835 | // set new offset |
---|
836 | hal_remote_sw( offset_xp , new ); |
---|
837 | |
---|
838 | // release file descriptor lock |
---|
839 | remote_rwlock_wr_unlock( lock_xp ); |
---|
840 | |
---|
841 | // success |
---|
842 | if ( new_offset != NULL ) |
---|
843 | *new_offset = new; |
---|
844 | return 0; |
---|
845 | |
---|
846 | } // vfs_lseek() |
---|
847 | |
---|
848 | /////////////////////////////////// |
---|
849 | error_t vfs_close( xptr_t file_xp, |
---|
850 | uint32_t file_id ) |
---|
851 | { |
---|
852 | assert( (file_xp != XPTR_NULL) , __FUNCTION__ , "file_xp == XPTR_NULL" ); |
---|
853 | |
---|
854 | assert( (file_id < CONFIG_PROCESS_FILE_MAX_NR) , __FUNCTION__ , "illegal file_id" ); |
---|
855 | |
---|
856 | thread_t * this = CURRENT_THREAD; |
---|
857 | process_t * process = this->process; |
---|
858 | |
---|
859 | // get cluster and local pointer on remote file descriptor |
---|
860 | cxy_t file_cxy = GET_CXY( file_xp ); |
---|
861 | vfs_file_t * file_ptr = (vfs_file_t *)GET_PTR( file_xp ); |
---|
862 | |
---|
863 | // get local pointer on local cluster manager |
---|
864 | cluster_t * cluster = LOCAL_CLUSTER; |
---|
865 | |
---|
866 | // get owner process cluster and lpid |
---|
867 | cxy_t owner_cxy = CXY_FROM_PID( process->pid ); |
---|
868 | lpid_t lpid = LPID_FROM_PID( process->pid ); |
---|
869 | |
---|
870 | // get extended pointers on copies root and lock |
---|
871 | xptr_t root_xp = XPTR( owner_cxy , &cluster->pmgr.copies_root[lpid] ); |
---|
872 | xptr_t lock_xp = XPTR( owner_cxy , &cluster->pmgr.copies_lock[lpid] ); |
---|
873 | |
---|
874 | // take the lock protecting the copies |
---|
875 | remote_spinlock_lock( lock_xp ); |
---|
876 | |
---|
877 | // 1) loop on the process descriptor copies to cancel all fd_array[file_id] entries |
---|
878 | xptr_t iter_xp; |
---|
879 | XLIST_FOREACH( root_xp , iter_xp ) |
---|
880 | { |
---|
881 | xptr_t process_xp = XLIST_ELEMENT( iter_xp , process_t , copies_list ); |
---|
882 | cxy_t process_cxy = GET_CXY( process_xp ); |
---|
883 | process_t * process_ptr = (process_t *)GET_PTR( process_xp ); |
---|
884 | |
---|
885 | xptr_t lock_xp = XPTR( process_cxy , &process_ptr->fd_array.lock ); |
---|
886 | xptr_t entry_xp = XPTR( process_cxy , &process_ptr->fd_array.array[file_id] ); |
---|
887 | |
---|
888 | // lock is required for atomic write of a 64 bits word |
---|
889 | remote_rwlock_wr_lock( lock_xp ); |
---|
890 | hal_remote_swd( entry_xp , XPTR_NULL ); |
---|
891 | remote_rwlock_wr_unlock( lock_xp ); |
---|
892 | |
---|
893 | hal_fence(); |
---|
894 | } |
---|
895 | |
---|
896 | // 2) release memory allocated to file descriptor in remote cluster |
---|
897 | if( file_cxy == local_cxy ) // file cluster is local |
---|
898 | { |
---|
899 | vfs_file_destroy( file_ptr ); |
---|
900 | } |
---|
901 | else // file cluster is local |
---|
902 | { |
---|
903 | rpc_vfs_file_destroy_client( file_cxy , file_ptr ); |
---|
904 | } |
---|
905 | |
---|
906 | return 0; |
---|
907 | |
---|
908 | } // end vfs_close() |
---|
909 | |
---|
910 | //////////////////////////////////// |
---|
911 | error_t vfs_unlink( xptr_t cwd_xp, |
---|
912 | char * path ) |
---|
913 | { |
---|
914 | assert( false , __FUNCTION__ , "not implemented\n" ); |
---|
915 | return 0; |
---|
916 | } |
---|
917 | |
---|
918 | //////////////////////////////////////// |
---|
919 | error_t vfs_stat( xptr_t file_xp, |
---|
920 | struct stat * k_stat ) |
---|
921 | { |
---|
922 | assert( false , __FUNCTION__ , "not implemented\n" ); |
---|
923 | return 0; |
---|
924 | } |
---|
925 | |
---|
926 | ///////////////////////////////////////////// |
---|
927 | error_t vfs_readdir( xptr_t file_xp, |
---|
928 | struct dirent * k_dirent ) |
---|
929 | { |
---|
930 | assert( false , __FUNCTION__ , "not implemented\n" ); |
---|
931 | return 0; |
---|
932 | } |
---|
933 | |
---|
934 | ////////////////////////////////////// |
---|
935 | error_t vfs_mkdir( xptr_t file_xp, |
---|
936 | char * path, |
---|
937 | uint32_t mode ) |
---|
938 | { |
---|
939 | assert( false , __FUNCTION__ , "not implemented\n" ); |
---|
940 | return 0; |
---|
941 | } |
---|
942 | |
---|
943 | //////////////////////////////////// |
---|
944 | error_t vfs_rmdir( xptr_t file_xp, |
---|
945 | char * path ) |
---|
946 | { |
---|
947 | assert( false , __FUNCTION__ , "not implemented\n" ); |
---|
948 | return 0; |
---|
949 | } |
---|
950 | |
---|
951 | /////////////////////////////////// |
---|
952 | error_t vfs_chdir( xptr_t cwd_xp, |
---|
953 | char * path ) |
---|
954 | { |
---|
955 | error_t error; |
---|
956 | xptr_t inode_xp; // extended pointer on target inode |
---|
957 | cxy_t inode_cxy; // target inode cluster identifier |
---|
958 | vfs_inode_t * inode_ptr; // target inode local pointer |
---|
959 | uint32_t mode; // lookup working mode |
---|
960 | vfs_inode_type_t inode_type; // target inode type |
---|
961 | |
---|
962 | // set lookup working mode |
---|
963 | mode = 0; |
---|
964 | |
---|
965 | // get extended pointer on target inode |
---|
966 | error = vfs_lookup( cwd_xp , path , mode , &inode_xp ); |
---|
967 | |
---|
968 | if( error ) return error; |
---|
969 | |
---|
970 | // get inode cluster and local pointer |
---|
971 | inode_cxy = GET_CXY( inode_xp ); |
---|
972 | inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp ); |
---|
973 | |
---|
974 | // get inode type from remote file |
---|
975 | inode_type = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->type ) ); |
---|
976 | |
---|
977 | if( inode_type != INODE_TYPE_DIR ) |
---|
978 | { |
---|
979 | CURRENT_THREAD->errno = ENOTDIR; |
---|
980 | return -1; |
---|
981 | } |
---|
982 | |
---|
983 | assert( false , __FUNCTION__ , "not implemented\n" ); |
---|
984 | return 0; |
---|
985 | } |
---|
986 | |
---|
987 | /////////////////////////////////// |
---|
988 | error_t vfs_chmod( xptr_t cwd_xp, |
---|
989 | char * path, |
---|
990 | uint32_t rights ) |
---|
991 | { |
---|
992 | error_t error; |
---|
993 | xptr_t inode_xp; // extended pointer on target inode |
---|
994 | cxy_t inode_cxy; // inode cluster identifier |
---|
995 | vfs_inode_t * inode_ptr; // inode local pointer |
---|
996 | uint32_t mode; // lookup working mode |
---|
997 | vfs_inode_type_t inode_type; // target inode type |
---|
998 | |
---|
999 | // set lookup working mode |
---|
1000 | mode = 0; |
---|
1001 | |
---|
1002 | // get extended pointer on target inode |
---|
1003 | error = vfs_lookup( cwd_xp , path , mode , &inode_xp ); |
---|
1004 | |
---|
1005 | if( error ) return error; |
---|
1006 | |
---|
1007 | // get inode cluster and local pointer |
---|
1008 | inode_cxy = GET_CXY( inode_xp ); |
---|
1009 | inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp ); |
---|
1010 | |
---|
1011 | // get inode type from remote inode |
---|
1012 | inode_type = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->type ) ); |
---|
1013 | |
---|
1014 | |
---|
1015 | assert( false , __FUNCTION__ , "not implemented\n" ); |
---|
1016 | return 0; |
---|
1017 | } |
---|
1018 | |
---|
1019 | /////////////////////////////////// |
---|
1020 | error_t vfs_mkfifo( xptr_t cwd_xp, |
---|
1021 | char * path, |
---|
1022 | uint32_t rights ) |
---|
1023 | { |
---|
1024 | assert( false , __FUNCTION__ , "not implemented\n" ); |
---|
1025 | return 0; |
---|
1026 | } |
---|
1027 | |
---|
1028 | |
---|
1029 | |
---|
1030 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1031 | // Inode Tree functions |
---|
1032 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1033 | |
---|
1034 | ///////////////////////////////// |
---|
1035 | cxy_t vfs_cluster_random_select() |
---|
1036 | { |
---|
1037 | uint32_t x_size = LOCAL_CLUSTER->x_size; |
---|
1038 | uint32_t y_size = LOCAL_CLUSTER->y_size; |
---|
1039 | uint32_t y_width = LOCAL_CLUSTER->y_width; |
---|
1040 | uint32_t index = ( hal_get_cycles() + hal_get_gid() ) % (x_size * y_size); |
---|
1041 | uint32_t x = index / y_size; |
---|
1042 | uint32_t y = index % y_size; |
---|
1043 | |
---|
1044 | return (x<<y_width) + y; |
---|
1045 | } |
---|
1046 | |
---|
1047 | |
---|
1048 | ////////////////////////////////////////////////////////////////////////// |
---|
1049 | // This static function is called by the vfs_display() function. |
---|
1050 | // that is supposed to take the TXT0 lock. |
---|
1051 | ////////////////////////////////////////////////////////////////////////// |
---|
1052 | static void vfs_recursive_display( xptr_t inode_xp, |
---|
1053 | xptr_t name_xp, |
---|
1054 | xptr_t dentry_xp, |
---|
1055 | uint32_t indent ) |
---|
1056 | { |
---|
1057 | cxy_t inode_cxy; |
---|
1058 | vfs_inode_t * inode_ptr; |
---|
1059 | vfs_inode_type_t inode_type; |
---|
1060 | xptr_t children_xp; // extended pointer on children xhtab |
---|
1061 | |
---|
1062 | xptr_t child_dentry_xp; |
---|
1063 | cxy_t child_dentry_cxy; |
---|
1064 | vfs_dentry_t * child_dentry_ptr; |
---|
1065 | xptr_t child_inode_xp; |
---|
1066 | xptr_t child_dentry_name_xp; |
---|
1067 | |
---|
1068 | char name[CONFIG_VFS_MAX_NAME_LENGTH]; |
---|
1069 | |
---|
1070 | char * indent_str[] = { "", // level 0 |
---|
1071 | " ", // level 1 |
---|
1072 | " ", // level 2 |
---|
1073 | " ", // level 3 |
---|
1074 | " ", // level 4 |
---|
1075 | " ", // level 5 |
---|
1076 | " ", // level 6 |
---|
1077 | " ", // level 7 |
---|
1078 | " ", // level 8 |
---|
1079 | " ", // level 9 |
---|
1080 | " ", // level 10 |
---|
1081 | " ", // level 11 |
---|
1082 | " ", // level 12 |
---|
1083 | " ", // level 13 |
---|
1084 | " ", // level 14 |
---|
1085 | " " }; // level 15 |
---|
1086 | |
---|
1087 | assert( (inode_xp != XPTR_NULL) , __FUNCTION__ , "inode_xp cannot be NULL\n" ); |
---|
1088 | assert( (name_xp != XPTR_NULL) , __FUNCTION__ , "name_xp cannot be NULL\n" ); |
---|
1089 | assert( (indent < 16) , __FUNCTION__ , "depth cannot be larger than 15\n" ); |
---|
1090 | |
---|
1091 | // get inode cluster and local pointer |
---|
1092 | inode_cxy = GET_CXY( inode_xp ); |
---|
1093 | inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp ); |
---|
1094 | |
---|
1095 | // get inode type |
---|
1096 | inode_type = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->type ) ); |
---|
1097 | |
---|
1098 | // get local pointer on associated mapper |
---|
1099 | mapper_t * mapper_ptr = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) ); |
---|
1100 | |
---|
1101 | // make a local copy of node name |
---|
1102 | hal_remote_strcpy( XPTR( local_cxy , name ) , name_xp ); |
---|
1103 | |
---|
1104 | // display inode |
---|
1105 | nolock_printk("%s%s <%s> : inode = %x / mapper = %x / cluster %x\n", |
---|
1106 | indent_str[indent], vfs_inode_type_str( inode_type ), name, |
---|
1107 | inode_ptr , mapper_ptr , inode_cxy ); |
---|
1108 | |
---|
1109 | // scan directory entries |
---|
1110 | if( inode_type == INODE_TYPE_DIR ) |
---|
1111 | { |
---|
1112 | // get extended pointer on directory entries xhtab |
---|
1113 | children_xp = XPTR( inode_cxy , &inode_ptr->children ); |
---|
1114 | |
---|
1115 | // get xhtab lock |
---|
1116 | xhtab_read_lock( children_xp ); |
---|
1117 | |
---|
1118 | // get first dentry from xhtab |
---|
1119 | child_dentry_xp = xhtab_get_first( children_xp ); |
---|
1120 | |
---|
1121 | while( child_dentry_xp != XPTR_NULL ) |
---|
1122 | { |
---|
1123 | // get dentry cluster and local pointer |
---|
1124 | child_dentry_cxy = GET_CXY( child_dentry_xp ); |
---|
1125 | child_dentry_ptr = (vfs_dentry_t *)GET_PTR( child_dentry_xp ); |
---|
1126 | |
---|
1127 | // get extended pointer on child inode |
---|
1128 | child_inode_xp = hal_remote_lwd( XPTR( child_dentry_cxy, |
---|
1129 | &child_dentry_ptr->child_xp ) ); |
---|
1130 | |
---|
1131 | // get extended pointer on dentry name |
---|
1132 | child_dentry_name_xp = XPTR( child_dentry_cxy , &child_dentry_ptr->name ); |
---|
1133 | |
---|
1134 | // recursive call on child inode |
---|
1135 | vfs_recursive_display( child_inode_xp, |
---|
1136 | child_dentry_name_xp, |
---|
1137 | child_dentry_xp, |
---|
1138 | indent+1 ); |
---|
1139 | |
---|
1140 | // get next dentry |
---|
1141 | child_dentry_xp = xhtab_get_next( children_xp ); |
---|
1142 | } |
---|
1143 | |
---|
1144 | // release xhtab lock |
---|
1145 | xhtab_read_unlock( children_xp ); |
---|
1146 | } |
---|
1147 | } // end vfs_recursive_display() |
---|
1148 | |
---|
1149 | /////////////////////////////////// |
---|
1150 | void vfs_display( xptr_t inode_xp ) |
---|
1151 | { |
---|
1152 | xptr_t name_xp; |
---|
1153 | xptr_t dentry_xp; |
---|
1154 | cxy_t dentry_cxy; |
---|
1155 | vfs_dentry_t * dentry_ptr; |
---|
1156 | uint32_t save_sr; |
---|
1157 | |
---|
1158 | // get target inode cluster and local pointer |
---|
1159 | cxy_t inode_cxy = GET_CXY( inode_xp ); |
---|
1160 | vfs_inode_t * inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp ); |
---|
1161 | |
---|
1162 | // get extended pointer on associated dentry |
---|
1163 | dentry_xp = hal_remote_lwd( XPTR( inode_cxy , &inode_ptr->parent_xp ) ); |
---|
1164 | |
---|
1165 | // check if target inode is the File System root |
---|
1166 | if( dentry_xp == XPTR_NULL ) |
---|
1167 | { |
---|
1168 | // build extended pointer on root name |
---|
1169 | name_xp = XPTR( local_cxy , "/" ); |
---|
1170 | } |
---|
1171 | else |
---|
1172 | { |
---|
1173 | // get dentry cluster and local pointer |
---|
1174 | dentry_cxy = GET_CXY( dentry_xp ); |
---|
1175 | dentry_ptr = (vfs_dentry_t *)GET_PTR( dentry_xp ); |
---|
1176 | |
---|
1177 | // get extended pointer on dentry name |
---|
1178 | name_xp = XPTR( dentry_cxy , &dentry_ptr->name ); |
---|
1179 | } |
---|
1180 | |
---|
1181 | // get pointers on TXT0 chdev |
---|
1182 | xptr_t txt0_xp = chdev_dir.txt_tx[0]; |
---|
1183 | cxy_t txt0_cxy = GET_CXY( txt0_xp ); |
---|
1184 | chdev_t * txt0_ptr = GET_PTR( txt0_xp ); |
---|
1185 | |
---|
1186 | // get extended pointer on remote TXT0 chdev lock |
---|
1187 | xptr_t lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock ); |
---|
1188 | |
---|
1189 | // get TXT0 lock in busy waiting mode |
---|
1190 | remote_spinlock_lock_busy( lock_xp , &save_sr ); |
---|
1191 | |
---|
1192 | // print header |
---|
1193 | nolock_printk("\n***** file system state\n\n"); |
---|
1194 | |
---|
1195 | // call recursive function |
---|
1196 | vfs_recursive_display( inode_xp , name_xp , dentry_xp , 0 ); |
---|
1197 | |
---|
1198 | // release lock |
---|
1199 | remote_spinlock_unlock_busy( lock_xp , save_sr ); |
---|
1200 | |
---|
1201 | } // end vfs_display() |
---|
1202 | |
---|
1203 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1204 | // This function is used by the vfs_lookup() function. |
---|
1205 | // It takes an extended pointer on a remote inode (parent directory inode), |
---|
1206 | // and check access_rights violation for the calling thread. |
---|
1207 | // It can be used by any thread running in any cluster. |
---|
1208 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1209 | // @ inode_xp : extended pointer on inode. |
---|
1210 | // @ client_uid : client thread user ID |
---|
1211 | // @ client_gid : client thread group ID |
---|
1212 | // @ return true if access rights are violated. |
---|
1213 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1214 | bool_t vfs_access_denied( xptr_t inode_xp, |
---|
1215 | uint32_t client_uid, |
---|
1216 | uint32_t client_gid ) |
---|
1217 | { |
---|
1218 | // get found inode cluster and local pointer |
---|
1219 | cxy_t inode_cxy = GET_CXY( inode_xp ); |
---|
1220 | vfs_inode_t * inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp ); |
---|
1221 | |
---|
1222 | // get inode access mode, UID, and GID |
---|
1223 | // TODO uint32_t mode = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->mode ) ); |
---|
1224 | uid_t uid = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->uid ) ); |
---|
1225 | gid_t gid = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->gid ) ); |
---|
1226 | |
---|
1227 | // FIXME : me must use mode |
---|
1228 | if( (uid == client_uid) || (gid == client_gid) ) return false; |
---|
1229 | else return true; |
---|
1230 | } |
---|
1231 | |
---|
1232 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1233 | // This static function is used by the vfs_lookup() function. |
---|
1234 | // It takes an extended pointer on a remote parent directory inode, a directory |
---|
1235 | // entry name, and returns an extended pointer on the child inode. |
---|
1236 | // It can be used by any thread running in any cluster. |
---|
1237 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1238 | // @ parent_xp : extended pointer on parent inode in remote cluster. |
---|
1239 | // @ name : dentry name |
---|
1240 | // @ child_xp : [out] buffer for extended pointer on child inode. |
---|
1241 | // @ return true if success / return false if not found. |
---|
1242 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1243 | static bool_t vfs_get_child( xptr_t parent_xp, |
---|
1244 | char * name, |
---|
1245 | xptr_t * child_xp ) |
---|
1246 | { |
---|
1247 | xptr_t xhtab_xp; // extended pointer on hash table containing children dentries |
---|
1248 | xptr_t dentry_xp; // extended pointer on children dentry |
---|
1249 | |
---|
1250 | // get parent inode cluster and local pointer |
---|
1251 | cxy_t parent_cxy = GET_CXY( parent_xp ); |
---|
1252 | vfs_inode_t * parent_ptr = (vfs_inode_t *)GET_PTR( parent_xp ); |
---|
1253 | |
---|
1254 | // get extended pointer on hash table of children directory entries |
---|
1255 | xhtab_xp = XPTR( parent_cxy , &parent_ptr->children ); |
---|
1256 | |
---|
1257 | // search extended pointer on matching dentry |
---|
1258 | dentry_xp = xhtab_lookup( xhtab_xp , name ); |
---|
1259 | |
---|
1260 | if( dentry_xp == XPTR_NULL ) return false; |
---|
1261 | |
---|
1262 | // get dentry cluster and local pointer |
---|
1263 | cxy_t dentry_cxy = GET_CXY( dentry_xp ); |
---|
1264 | vfs_dentry_t * dentry_ptr = (vfs_dentry_t *)GET_PTR( dentry_xp ); |
---|
1265 | |
---|
1266 | // return child inode |
---|
1267 | *child_xp = (xptr_t)hal_remote_lwd( XPTR( dentry_cxy , &dentry_ptr->child_xp ) ); |
---|
1268 | return true; |
---|
1269 | |
---|
1270 | } // end vfs_get_child() |
---|
1271 | |
---|
1272 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1273 | // This static function is used by the vfs_lookup() function. |
---|
1274 | // It takes the <current> pointer on a buffer containing a complete pathname, and return |
---|
1275 | // in the <name> buffer, allocated by the caller, a single name in the path. |
---|
1276 | // It return also in the <next> pointer the next character to analyse in the path. |
---|
1277 | // Finally it returns a <last> boolean, that is true when the returned <name> is the |
---|
1278 | // last name in the path. The names are supposed to be separated by one or several '/' |
---|
1279 | // characters, that are not written in the <name> buffer. |
---|
1280 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1281 | // @ current : pointer on first character to analyse in buffer containing the path. |
---|
1282 | // @ name : [out] pointer on buffer allocated by the caller for the returned name. |
---|
1283 | // @ next : [out] pointer on next character to analyse in buffer containing the path. |
---|
1284 | // @ last : [out] true if the returned name is the last (NUL character found). |
---|
1285 | // @ return 0 if success / return EINVAL if string empty (first chracter is NUL). |
---|
1286 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1287 | static error_t vfs_get_name_from_path( char * current, |
---|
1288 | char * name, |
---|
1289 | char ** next, |
---|
1290 | bool_t * last ) |
---|
1291 | { |
---|
1292 | char * ptr = current; |
---|
1293 | |
---|
1294 | // skip leading '/' characters |
---|
1295 | while( *ptr == '/' ) ptr++; |
---|
1296 | |
---|
1297 | // return EINVAL if string empty |
---|
1298 | if( *ptr == 0 ) return EINVAL; |
---|
1299 | |
---|
1300 | // copy all characters in name until NUL or '/' |
---|
1301 | while( (*ptr != 0) && (*ptr !='/') ) *(name++) = *(ptr++); |
---|
1302 | |
---|
1303 | // set NUL terminating character in name buffer |
---|
1304 | *(name++) = 0; |
---|
1305 | |
---|
1306 | // return last an next |
---|
1307 | if( *ptr == 0 ) // last found character is NUL => last name in path |
---|
1308 | { |
---|
1309 | *last = true; |
---|
1310 | } |
---|
1311 | else // last found character is '/' => skip it |
---|
1312 | { |
---|
1313 | *last = false; |
---|
1314 | *next = ptr + 1; |
---|
1315 | } |
---|
1316 | |
---|
1317 | return 0; |
---|
1318 | |
---|
1319 | } // end vfs_get name_from_path() |
---|
1320 | |
---|
1321 | ////////////////////////////////////////////// |
---|
1322 | error_t vfs_lookup( xptr_t cwd_xp, |
---|
1323 | char * pathname, |
---|
1324 | uint32_t mode, |
---|
1325 | xptr_t * inode_xp ) |
---|
1326 | { |
---|
1327 | char name[CONFIG_VFS_MAX_NAME_LENGTH]; // one name in path |
---|
1328 | |
---|
1329 | xptr_t parent_xp; // extended pointer on parent inode |
---|
1330 | cxy_t parent_cxy; // cluster for parent inode |
---|
1331 | vfs_inode_t * parent_ptr; // local pointer on parent inode |
---|
1332 | xptr_t child_xp; // extended pointer on child inode |
---|
1333 | cxy_t child_cxy; // cluster for child inode |
---|
1334 | vfs_inode_t * child_ptr; // local pointer on child inode |
---|
1335 | vfs_inode_type_t child_type; // child inode type |
---|
1336 | vfs_fs_type_t fs_type; // File system type |
---|
1337 | vfs_ctx_t * ctx_ptr; // local pointer on FS context |
---|
1338 | char * current; // current pointer on path |
---|
1339 | char * next; // next value for current pointer |
---|
1340 | bool_t last; // true when the name is the last in path |
---|
1341 | bool_t found; // true when a child has been found |
---|
1342 | thread_t * this; // pointer on calling thread descriptor |
---|
1343 | process_t * process; // pointer on calling process descriptor |
---|
1344 | error_t error; |
---|
1345 | |
---|
1346 | this = CURRENT_THREAD; |
---|
1347 | process = this->process; |
---|
1348 | |
---|
1349 | #if CONFIG_DEBUG_VFS_LOOKUP |
---|
1350 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
1351 | if( CONFIG_DEBUG_VFS_LOOKUP < cycle ) |
---|
1352 | printk("\n[DBG] %s : thread %x enter for <%s> / cycle %d\n", |
---|
1353 | __FUNCTION__, CURRENT_THREAD, pathname, cycle ); |
---|
1354 | #endif |
---|
1355 | |
---|
1356 | // get extended pointer on first inode to search |
---|
1357 | if( pathname[0] == '/' ) parent_xp = process->vfs_root_xp; |
---|
1358 | else parent_xp = cwd_xp; |
---|
1359 | |
---|
1360 | // initialise other loop variables |
---|
1361 | current = pathname; |
---|
1362 | next = NULL; |
---|
1363 | last = false; |
---|
1364 | child_xp = XPTR_NULL; |
---|
1365 | |
---|
1366 | // take lock on parent inode |
---|
1367 | vfs_inode_lock( parent_xp ); |
---|
1368 | |
---|
1369 | // sequencially loop on nodes in pathname |
---|
1370 | // load from device if one node not found in inode tree |
---|
1371 | // exit loop when last name found (i.e. last == true) |
---|
1372 | do |
---|
1373 | { |
---|
1374 | // get one name from path, and "last" flag |
---|
1375 | vfs_get_name_from_path( current , name , &next , &last ); |
---|
1376 | |
---|
1377 | #if (CONFIG_DEBUG_VFS_LOOKUP & 1) |
---|
1378 | if( CONFIG_DEBUG_VFS_LOOKUP < cycle ) |
---|
1379 | printk("\n[DBG] %s : look for <%s> / last = %d\n", __FUNCTION__ , name , last ); |
---|
1380 | #endif |
---|
1381 | |
---|
1382 | // search a child dentry matching name in parent inode |
---|
1383 | found = vfs_get_child( parent_xp, |
---|
1384 | name, |
---|
1385 | &child_xp ); |
---|
1386 | |
---|
1387 | // if a child inode is not found in the inode tree: |
---|
1388 | // - we create the missing inode/dentry couple in the inode tree, |
---|
1389 | // - we scan the parent mapper to complete the child inode (type and extension), |
---|
1390 | // - we return an error if child not found on device. |
---|
1391 | // - if the missing child is a directory, we load the child mapper from device |
---|
1392 | |
---|
1393 | // for the last name, the behaviour depends on the "mode" argument: |
---|
1394 | |
---|
1395 | if (found == false ) // child node not found in inode tree |
---|
1396 | { |
---|
1397 | |
---|
1398 | #if (CONFIG_DEBUG_VFS_LOOKUP & 1) |
---|
1399 | if( CONFIG_DEBUG_VFS_LOOKUP < cycle ) |
---|
1400 | printk("\n[DBG] %s : miss <%s> => load it\n", __FUNCTION__ , name ); |
---|
1401 | #endif |
---|
1402 | |
---|
1403 | // release lock on parent inode |
---|
1404 | vfs_inode_unlock( parent_xp ); |
---|
1405 | |
---|
1406 | // get parent inode FS type |
---|
1407 | parent_cxy = GET_CXY( parent_xp ); |
---|
1408 | parent_ptr = (vfs_inode_t *)GET_PTR( parent_xp ); |
---|
1409 | ctx_ptr = (vfs_ctx_t *)hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->ctx ) ); |
---|
1410 | fs_type = hal_remote_lw( XPTR( parent_cxy , &ctx_ptr->type ) ); |
---|
1411 | |
---|
1412 | // select a cluster for missing inode |
---|
1413 | child_cxy = vfs_cluster_random_select(); |
---|
1414 | |
---|
1415 | // insert a new child dentry/inode in parent inode |
---|
1416 | error = vfs_add_child_in_parent( child_cxy, |
---|
1417 | INODE_TYPE_DIR, |
---|
1418 | fs_type, |
---|
1419 | parent_xp, |
---|
1420 | name, |
---|
1421 | NULL, // fs_type_specific inode extend |
---|
1422 | &child_xp ); |
---|
1423 | if( error ) |
---|
1424 | { |
---|
1425 | printk("\n[ERROR] in %s : no memory for inode <%s> in path <%s>\n", |
---|
1426 | __FUNCTION__ , name , pathname ); |
---|
1427 | return ENOMEM; |
---|
1428 | } |
---|
1429 | |
---|
1430 | // scan parent mapper to complete the missing inode |
---|
1431 | if( parent_cxy == local_cxy ) |
---|
1432 | { |
---|
1433 | error = vfs_inode_load( parent_ptr, |
---|
1434 | name, |
---|
1435 | child_xp ); |
---|
1436 | } |
---|
1437 | else |
---|
1438 | { |
---|
1439 | rpc_vfs_inode_load_client( parent_cxy, |
---|
1440 | parent_ptr, |
---|
1441 | name, |
---|
1442 | child_xp, |
---|
1443 | &error ); |
---|
1444 | } |
---|
1445 | |
---|
1446 | if ( error ) |
---|
1447 | { |
---|
1448 | printk("\n[ERROR] in %s : core[%x,%d] / <%s> node not found in <%s>\n", |
---|
1449 | __FUNCTION__ , local_cxy , this->core->lid , name , pathname ); |
---|
1450 | return ENOENT; |
---|
1451 | } |
---|
1452 | |
---|
1453 | // get child inode type |
---|
1454 | child_ptr = (vfs_inode_t *)GET_PTR( child_xp ); |
---|
1455 | child_type = hal_remote_lw( XPTR( child_cxy , &child_ptr->type ) ); |
---|
1456 | |
---|
1457 | // load child mapper from device if it is a directory |
---|
1458 | if( child_type == INODE_TYPE_DIR ) |
---|
1459 | { |
---|
1460 | if( child_cxy == local_cxy ) |
---|
1461 | { |
---|
1462 | error = vfs_mapper_load_all( child_ptr ); |
---|
1463 | } |
---|
1464 | else |
---|
1465 | { |
---|
1466 | rpc_vfs_mapper_load_all_client( child_cxy, |
---|
1467 | child_ptr, |
---|
1468 | &error ); |
---|
1469 | } |
---|
1470 | |
---|
1471 | if ( error ) |
---|
1472 | { |
---|
1473 | printk("\n[ERROR] in %s : core[%x,%d] cannot access device for <%s>\n", |
---|
1474 | __FUNCTION__ , local_cxy , this->core->lid , name ); |
---|
1475 | return EIO; |
---|
1476 | } |
---|
1477 | } |
---|
1478 | |
---|
1479 | // TODO handle lookup mode here [AG] |
---|
1480 | |
---|
1481 | // take lock on parent inode |
---|
1482 | vfs_inode_lock( parent_xp ); |
---|
1483 | |
---|
1484 | #if (CONFIG_DEBUG_VFS_LOOKUP & 1) |
---|
1485 | if( CONFIG_DEBUG_VFS_LOOKUP < cycle ) |
---|
1486 | printk("\n[DBG] %s : created node <%s>\n", __FUNCTION__ , name ); |
---|
1487 | #endif |
---|
1488 | |
---|
1489 | } |
---|
1490 | |
---|
1491 | #if (CONFIG_DEBUG_VFS_LOOKUP & 1) |
---|
1492 | if( CONFIG_DEBUG_VFS_LOOKUP < cycle ) |
---|
1493 | printk("\n[DBG] %s : found <%s> / inode %x in cluster %x\n", |
---|
1494 | __FUNCTION__ , name , GET_PTR(child_xp) , GET_CXY(child_xp) ); |
---|
1495 | #endif |
---|
1496 | |
---|
1497 | // TODO check access rights here [AG] |
---|
1498 | // error = vfs_access_denied( child_xp, |
---|
1499 | // client_uid, |
---|
1500 | // client_gid ); |
---|
1501 | // if( error ) |
---|
1502 | // { |
---|
1503 | // printk("\n[ERROR] in %s : permission denied for %s\n", __FUNCTION__ , name ); |
---|
1504 | // return EACCES; |
---|
1505 | // } |
---|
1506 | |
---|
1507 | // take lock on child inode and release lock on parent |
---|
1508 | vfs_inode_lock( child_xp ); |
---|
1509 | vfs_inode_unlock( parent_xp ); |
---|
1510 | |
---|
1511 | // update loop variables |
---|
1512 | parent_xp = child_xp; |
---|
1513 | current = next; |
---|
1514 | } |
---|
1515 | while( last == false ); |
---|
1516 | |
---|
1517 | // release lock |
---|
1518 | vfs_inode_unlock( parent_xp ); |
---|
1519 | |
---|
1520 | #if CONFIG_DEBUG_VFS_LOOKUP |
---|
1521 | cycle = (uint32_t)hal_get_cycles(); |
---|
1522 | if( CONFIG_DEBUG_VFS_LOOKUP < cycle ) |
---|
1523 | printk("\n[DBG] %s : thread %x exit for <%s> / inode %x in cluster %x / cycle %d\n", |
---|
1524 | __FUNCTION__, CURRENT_THREAD, pathname, GET_PTR(child_xp), GET_CXY(child_xp), cycle ); |
---|
1525 | #endif |
---|
1526 | |
---|
1527 | // return searched pointer |
---|
1528 | *inode_xp = child_xp; |
---|
1529 | |
---|
1530 | return 0; |
---|
1531 | |
---|
1532 | } // end vfs_lookup() |
---|
1533 | |
---|
1534 | //////////////////////////////////////////// |
---|
1535 | error_t vfs_get_path( xptr_t searched_xp, |
---|
1536 | char * buffer, |
---|
1537 | uint32_t max_size ) |
---|
1538 | { |
---|
1539 | xptr_t dentry_xp; // extended pointer on current dentry |
---|
1540 | char * name; // local pointer on current dentry name |
---|
1541 | uint32_t length; // length of current dentry name |
---|
1542 | uint32_t count; // number of characters written in buffer |
---|
1543 | uint32_t index; // slot index in buffer |
---|
1544 | xptr_t inode_xp; // extended pointer on |
---|
1545 | |
---|
1546 | // implementation note: |
---|
1547 | // we use two variables "index" and "count" because the buffer |
---|
1548 | // is written in decreasing index order (from leaf to root) |
---|
1549 | // TODO : handle conflict with a concurrent rename [AG] |
---|
1550 | // FIXME : handle synchro in the loop [AG] |
---|
1551 | |
---|
1552 | // set the NUL character in buffer / initialise buffer index and count |
---|
1553 | buffer[max_size - 1] = 0; |
---|
1554 | count = 1; |
---|
1555 | index = max_size - 2; |
---|
1556 | |
---|
1557 | // initialize current inode |
---|
1558 | inode_xp = searched_xp; |
---|
1559 | |
---|
1560 | // exit when root inode found (i.e. dentry_xp == XPTR_NULL) |
---|
1561 | do |
---|
1562 | { |
---|
1563 | // get inode cluster and local pointer |
---|
1564 | cxy_t inode_cxy = GET_CXY( inode_xp ); |
---|
1565 | vfs_inode_t * inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp ); |
---|
1566 | |
---|
1567 | // get extended pointer on parent dentry |
---|
1568 | dentry_xp = (xptr_t)hal_remote_lwd( XPTR( inode_cxy , inode_ptr->parent_xp ) ); |
---|
1569 | |
---|
1570 | // get dentry cluster and local pointer |
---|
1571 | cxy_t dentry_cxy = GET_CXY( dentry_xp ); |
---|
1572 | vfs_dentry_t * dentry_ptr = (vfs_dentry_t *)GET_PTR( dentry_xp ); |
---|
1573 | |
---|
1574 | // get dentry name length and pointer |
---|
1575 | length = hal_remote_lw( XPTR( dentry_cxy , &dentry_ptr->length ) ); |
---|
1576 | name = (char *)hal_remote_lpt( XPTR( dentry_cxy , &dentry_ptr->name ) ); |
---|
1577 | |
---|
1578 | // update index and count |
---|
1579 | index -= (length + 1); |
---|
1580 | count += (length + 1); |
---|
1581 | |
---|
1582 | // check buffer overflow |
---|
1583 | if( count >= max_size ) |
---|
1584 | { |
---|
1585 | printk("\n[ERROR] in %s : kernel buffer too small\n", __FUNCTION__ ); |
---|
1586 | return EINVAL; |
---|
1587 | } |
---|
1588 | |
---|
1589 | // update pathname |
---|
1590 | hal_remote_memcpy( XPTR( local_cxy , &buffer[index + 1] ) , |
---|
1591 | XPTR( dentry_cxy , name ) , length ); |
---|
1592 | buffer[index] = '/'; |
---|
1593 | |
---|
1594 | // get extended pointer on next inode |
---|
1595 | inode_xp = (xptr_t)hal_remote_lwd( XPTR( dentry_cxy , dentry_ptr->parent ) ); |
---|
1596 | } |
---|
1597 | while( (dentry_xp != XPTR_NULL) ); |
---|
1598 | |
---|
1599 | return 0; |
---|
1600 | |
---|
1601 | } // end vfs_get_path() |
---|
1602 | |
---|
1603 | |
---|
1604 | ////////////////////////////////////////////////////////////// |
---|
1605 | error_t vfs_add_child_in_parent( cxy_t child_cxy, |
---|
1606 | vfs_inode_type_t inode_type, |
---|
1607 | vfs_fs_type_t fs_type, |
---|
1608 | xptr_t parent_xp, |
---|
1609 | char * name, |
---|
1610 | void * extend, |
---|
1611 | xptr_t * child_xp ) |
---|
1612 | { |
---|
1613 | error_t error; |
---|
1614 | xptr_t dentry_xp; // extended pointer on created dentry |
---|
1615 | xptr_t inode_xp; // extended pointer on created inode |
---|
1616 | cxy_t parent_cxy; // parent inode cluster identifier |
---|
1617 | vfs_inode_t * parent_ptr; // parent inode local pointer |
---|
1618 | |
---|
1619 | // get parent inode cluster and local pointer |
---|
1620 | parent_cxy = GET_CXY( parent_xp ); |
---|
1621 | parent_ptr = (vfs_inode_t *)GET_PTR( parent_xp ); |
---|
1622 | |
---|
1623 | #if CONFIG_DEBUG_VFS_ADD_CHILD |
---|
1624 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
1625 | if( CONFIG_DEBUG_VFS_ADD_CHILD < cycle ) |
---|
1626 | printk("\n[DBG] %s : thread %x enter for <%s> / child_cxy = %x / parent_cxy = %x\n", |
---|
1627 | __FUNCTION__ , CURRENT_THREAD , name , child_cxy , parent_cxy ); |
---|
1628 | #endif |
---|
1629 | |
---|
1630 | // 1. create dentry |
---|
1631 | if( parent_cxy == local_cxy ) // parent cluster is the local cluster |
---|
1632 | { |
---|
1633 | error = vfs_dentry_create( fs_type, |
---|
1634 | name, |
---|
1635 | parent_ptr, |
---|
1636 | &dentry_xp ); |
---|
1637 | |
---|
1638 | #if (CONFIG_DEBUG_VFS_ADD_CHILD & 1) |
---|
1639 | if( CONFIG_DEBUG_VFS_ADD_CHILD < cycle ) |
---|
1640 | printk("\n[DBG] %s : dentry <%s> created in cluster %x\n", __FUNCTION__, name, local_cxy ); |
---|
1641 | #endif |
---|
1642 | |
---|
1643 | } |
---|
1644 | else // parent cluster is remote |
---|
1645 | { |
---|
1646 | rpc_vfs_dentry_create_client( parent_cxy, |
---|
1647 | fs_type, |
---|
1648 | name, |
---|
1649 | parent_ptr, |
---|
1650 | &dentry_xp, |
---|
1651 | &error ); |
---|
1652 | |
---|
1653 | #if (CONFIG_DEBUG_VFS_ADD_CHILD & 1) |
---|
1654 | if( CONFIG_DEBUG_VFS_ADD_CHILD < cycle ) |
---|
1655 | printk("\n[DBG] %s : dentry <%s> created in cluster %x\n", __FUNCTION__, name, parent_cxy ); |
---|
1656 | #endif |
---|
1657 | |
---|
1658 | } |
---|
1659 | |
---|
1660 | if( error ) |
---|
1661 | { |
---|
1662 | printk("\n[ERROR] in %s : cannot create dentry in cluster %x\n", |
---|
1663 | __FUNCTION__ , parent_cxy ); |
---|
1664 | return ENOMEM; |
---|
1665 | } |
---|
1666 | |
---|
1667 | // 2. create child inode TODO : define attr / mode / uid / gid |
---|
1668 | uint32_t attr = 0; |
---|
1669 | uint32_t mode = 0; |
---|
1670 | uint32_t uid = 0; |
---|
1671 | uint32_t gid = 0; |
---|
1672 | |
---|
1673 | if( child_cxy == local_cxy ) // child cluster is the local cluster |
---|
1674 | { |
---|
1675 | error = vfs_inode_create( dentry_xp, |
---|
1676 | fs_type, |
---|
1677 | inode_type, |
---|
1678 | extend, |
---|
1679 | attr, |
---|
1680 | mode, |
---|
1681 | uid, |
---|
1682 | gid, |
---|
1683 | &inode_xp ); |
---|
1684 | |
---|
1685 | #if (CONFIG_DEBUG_VFS_ADD_CHILD & 1) |
---|
1686 | if( CONFIG_DEBUG_VFS_ADD_CHILD < cycle ) |
---|
1687 | printk("\n[DBG] %s : inode <%x> created in cluster %x\n", |
---|
1688 | __FUNCTION__ , GET_PTR(inode_xp) , local_cxy ); |
---|
1689 | #endif |
---|
1690 | |
---|
1691 | vfs_dmsg("\n[DBG] %s : inode %x created in local cluster %x\n", |
---|
1692 | __FUNCTION__ , GET_PTR(inode_xp) , local_cxy ); |
---|
1693 | |
---|
1694 | } |
---|
1695 | else // child cluster is remote |
---|
1696 | { |
---|
1697 | rpc_vfs_inode_create_client( child_cxy, |
---|
1698 | dentry_xp, |
---|
1699 | fs_type, |
---|
1700 | inode_type, |
---|
1701 | extend, |
---|
1702 | attr, |
---|
1703 | mode, |
---|
1704 | uid, |
---|
1705 | gid, |
---|
1706 | &inode_xp, |
---|
1707 | &error ); |
---|
1708 | |
---|
1709 | #if (CONFIG_DEBUG_VFS_ADD_CHILD & 1) |
---|
1710 | if( CONFIG_DEBUG_VFS_ADD_CHILD < cycle ) |
---|
1711 | printk("\n[DBG] %s : inode <%s> created in cluster %x\n", |
---|
1712 | __FUNCTION__ , GET_PTR(inode_xp) , child_cxy ); |
---|
1713 | #endif |
---|
1714 | |
---|
1715 | } |
---|
1716 | |
---|
1717 | if( error ) |
---|
1718 | { |
---|
1719 | printk("\n[ERROR] in %s : cannot create inode in cluster %x\n", |
---|
1720 | __FUNCTION__ , child_cxy ); |
---|
1721 | |
---|
1722 | vfs_dentry_t * dentry = (vfs_dentry_t *)GET_PTR( dentry_xp ); |
---|
1723 | if( parent_cxy == local_cxy ) vfs_dentry_destroy( dentry ); |
---|
1724 | else rpc_vfs_dentry_destroy_client( parent_cxy , dentry ); |
---|
1725 | return ENOMEM; |
---|
1726 | } |
---|
1727 | |
---|
1728 | // 3. update extended pointer on inode in dentry |
---|
1729 | cxy_t dentry_cxy = GET_CXY( dentry_xp ); |
---|
1730 | vfs_dentry_t * dentry_ptr = (vfs_dentry_t *)GET_PTR( dentry_xp ); |
---|
1731 | hal_remote_swd( XPTR( dentry_cxy , &dentry_ptr->child_xp ) , inode_xp ); |
---|
1732 | |
---|
1733 | #if CONFIG_DEBUG_VFS_ADD_CHILD |
---|
1734 | cycle = (uint32_t)hal_get_cycles(); |
---|
1735 | if( CONFIG_DEBUG_VFS_ADD_CHILD < cycle ) |
---|
1736 | printk("\n[DBG] %s : thread %x exit for <%s>\n", |
---|
1737 | __FUNCTION__ , CURRENT_THREAD , name ); |
---|
1738 | #endif |
---|
1739 | |
---|
1740 | // success : return extended pointer on child inode |
---|
1741 | *child_xp = inode_xp; |
---|
1742 | return 0; |
---|
1743 | |
---|
1744 | } // end vfs_add_child_in_parent() |
---|
1745 | |
---|
1746 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1747 | // Mapper related functions |
---|
1748 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1749 | |
---|
1750 | //////////////////////////////////////////// |
---|
1751 | error_t vfs_mapper_move_page( page_t * page, |
---|
1752 | bool_t to_mapper ) |
---|
1753 | { |
---|
1754 | error_t error = 0; |
---|
1755 | |
---|
1756 | assert( (page != NULL) , __FUNCTION__ , "page pointer is NULL\n" ); |
---|
1757 | |
---|
1758 | mapper_t * mapper = page->mapper; |
---|
1759 | |
---|
1760 | assert( (mapper != NULL) , __FUNCTION__ , "no mapper for page\n" ); |
---|
1761 | |
---|
1762 | #if CONFIG_DEBUG_VFS_MAPPER_MOVE |
---|
1763 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
1764 | if( CONFIG_DEBUG_VFS_MAPPER_MOVE < cycle ) |
---|
1765 | printk("\n[DBG] %s : thread %x enter for page %d / mapper %x / inode %x / cycle %d\n", |
---|
1766 | __FUNCTION__, CURRENT_THREAD, page->index, mapper, mapper->inode, cycle ); |
---|
1767 | #endif |
---|
1768 | |
---|
1769 | // get FS type |
---|
1770 | vfs_fs_type_t fs_type = mapper->type; |
---|
1771 | |
---|
1772 | // call relevant FS function |
---|
1773 | if( fs_type == FS_TYPE_FATFS ) |
---|
1774 | { |
---|
1775 | rwlock_wr_lock( &mapper->lock ); |
---|
1776 | error = fatfs_mapper_move_page( page , to_mapper ); |
---|
1777 | rwlock_wr_unlock( &mapper->lock ); |
---|
1778 | } |
---|
1779 | else if( fs_type == FS_TYPE_RAMFS ) |
---|
1780 | { |
---|
1781 | assert( false , __FUNCTION__ , "should not be called for RAMFS\n" ); |
---|
1782 | } |
---|
1783 | else if( fs_type == FS_TYPE_DEVFS ) |
---|
1784 | { |
---|
1785 | assert( false , __FUNCTION__ , "should not be called for DEVFS\n" ); |
---|
1786 | } |
---|
1787 | else |
---|
1788 | { |
---|
1789 | assert( false , __FUNCTION__ , "undefined file system type\n" ); |
---|
1790 | } |
---|
1791 | |
---|
1792 | #if CONFIG_DEBUG_VFS_MAPPER_MOVE |
---|
1793 | cycle = (uint32_t)hal_get_cycles(); |
---|
1794 | if( CONFIG_DEBUG_VFS_MAPPER_MOVE < cycle ) |
---|
1795 | printk("\n[DBG] %s : thread %x exit for page %d / mapper %x / inode %x / cycle %d\n", |
---|
1796 | __FUNCTION__, CURRENT_THREAD, page->index, mapper, mapper->inode, cycle ); |
---|
1797 | #endif |
---|
1798 | |
---|
1799 | return error; |
---|
1800 | |
---|
1801 | } // end vfs_move_page() |
---|
1802 | |
---|
1803 | ////////////////////////////////////////////////// |
---|
1804 | error_t vfs_mapper_load_all( vfs_inode_t * inode ) |
---|
1805 | { |
---|
1806 | assert( (inode != NULL) , __FUNCTION__ , "inode pointer is NULL\n" ); |
---|
1807 | |
---|
1808 | uint32_t index; |
---|
1809 | page_t * page; |
---|
1810 | |
---|
1811 | mapper_t * mapper = inode->mapper; |
---|
1812 | uint32_t size = inode->size; |
---|
1813 | |
---|
1814 | assert( (mapper != NULL) , __FUNCTION__ , "mapper pointer is NULL\n" ); |
---|
1815 | |
---|
1816 | #if CONFIG_DEBUG_VFS_MAPPER_LOAD |
---|
1817 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
1818 | if( CONFIG_DEBUG_VFS_MAPPER_MOVE < cycle ) |
---|
1819 | printk("\n[DBG] %s : thread %x enter for inode %x in cluster %x / cycle %d\n", |
---|
1820 | __FUNCTION__, CURRENT_THREAD, inode, local_cxy, cycle ); |
---|
1821 | #endif |
---|
1822 | |
---|
1823 | // compute number of pages |
---|
1824 | uint32_t npages = size >> CONFIG_PPM_PAGE_SHIFT; |
---|
1825 | if( (size & CONFIG_PPM_PAGE_MASK) || (size == 0) ) npages++; |
---|
1826 | |
---|
1827 | // loop on pages |
---|
1828 | for( index = 0 ; index < npages ; index ++ ) |
---|
1829 | { |
---|
1830 | // this function allocates the missing page in mapper, |
---|
1831 | // and call the vfs_mapper_move_page() to load the page from device |
---|
1832 | page = mapper_get_page( mapper , index ); |
---|
1833 | |
---|
1834 | if( page == NULL ) return EIO; |
---|
1835 | } |
---|
1836 | |
---|
1837 | #if CONFIG_DEBUG_VFS_MAPPER_LOAD |
---|
1838 | cycle = (uint32_t)hal_get_cycles(); |
---|
1839 | if( CONFIG_DEBUG_VFS_MAPPER_MOVE < cycle ) |
---|
1840 | printk("\n[DBG] %s : thread %x exit for inode %x in cluster %x / cycle %d\n", |
---|
1841 | __FUNCTION__, CURRENT_THREAD, inode, local_cxy, cycle ); |
---|
1842 | #endif |
---|
1843 | |
---|
1844 | return 0; |
---|
1845 | |
---|
1846 | } // end vfs_mapper_load_all() |
---|
1847 | |
---|