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 (2016,2017,2018) |
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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_kernel_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 == 0xFFFFFFFF ) // 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 DEBUG_VFS_INODE_CREATE |
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160 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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161 | if( 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 DEBUG_VFS_INODE_CREATE |
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237 | cycle = (uint32_t)hal_get_cycles(); |
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238 | if( 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 | error_t vfs_inode_destroy( vfs_inode_t * inode ) |
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251 | { |
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252 | assert( (inode->refcount == 0), __FUNCTION__ , "inode refcount non zero\n" ); |
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253 | |
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254 | // release memory allocated for mapper |
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255 | mapper_destroy( inode->mapper ); |
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256 | |
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257 | // release memory allocate for inode descriptor |
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258 | kmem_req_t req; |
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259 | req.ptr = inode; |
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260 | req.type = KMEM_VFS_INODE; |
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261 | kmem_free( &req ); |
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262 | |
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263 | return 0; |
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264 | |
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265 | } // end vfs_inode_destroy() |
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266 | |
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267 | ///////////////////////////////////////////// |
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268 | error_t vfs_inode_load( vfs_inode_t * parent, |
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269 | char * name, |
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270 | xptr_t child_xp ) |
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271 | { |
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272 | |
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273 | #if DEBUG_VFS_INODE_LOAD |
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274 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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275 | if( DEBUG_VFS_INODE_LOAD < cycle ) |
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276 | printk("\n[DBG] %s : thread %x enter for <%s> / cycle %d\n", |
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277 | __FUNCTION__, CURRENT_THREAD , name , cycle ); |
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278 | #endif |
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279 | |
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280 | error_t error = 0; |
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281 | |
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282 | assert( (parent != NULL) , __FUNCTION__ , "parent pointer is NULL\n"); |
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283 | |
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284 | assert( (child_xp != XPTR_NULL) , __FUNCTION__ , "child pointer is NULL\n"); |
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285 | |
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286 | // get parent inode FS type |
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287 | vfs_fs_type_t fs_type = parent->ctx->type; |
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288 | |
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289 | // call relevant FS function |
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290 | if( fs_type == FS_TYPE_FATFS ) |
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291 | { |
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292 | error = fatfs_inode_load( parent , name , child_xp ); |
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293 | } |
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294 | else if( fs_type == FS_TYPE_RAMFS ) |
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295 | { |
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296 | assert( false , __FUNCTION__ , "should not be called for RAMFS\n" ); |
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297 | } |
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298 | else if( fs_type == FS_TYPE_DEVFS ) |
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299 | { |
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300 | assert( false , __FUNCTION__ , "should not be called for DEVFS\n" ); |
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301 | } |
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302 | else |
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303 | { |
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304 | assert( false , __FUNCTION__ , "undefined file system type\n" ); |
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305 | } |
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306 | |
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307 | #if DEBUG_VFS_INODE_LOAD |
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308 | cycle = (uint32_t)hal_get_cycles(); |
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309 | if( DEBUG_VFS_INODE_LOAD < cycle ) |
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310 | printk("\n[DBG] %s : thread %x exit for <%s> / cycle %d\n", |
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311 | __FUNCTION__, CURRENT_THREAD , name , cycle ); |
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312 | #endif |
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313 | |
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314 | return error; |
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315 | |
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316 | } // end vfs_inode_load() |
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317 | |
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318 | //////////////////////////////////////////// |
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319 | void vfs_inode_remote_up( xptr_t inode_xp ) |
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320 | { |
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321 | // get inode cluster and local pointer |
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322 | cxy_t inode_cxy = GET_CXY( inode_xp ); |
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323 | vfs_inode_t * inode_ptr = GET_PTR( inode_xp ); |
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324 | |
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325 | hal_remote_atomic_add( XPTR( inode_cxy , &inode_ptr->refcount ) , 1 ); |
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326 | } |
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327 | |
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328 | ////////////////////////////////////////////// |
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329 | void vfs_inode_remote_down( xptr_t inode_xp ) |
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330 | { |
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331 | // get inode cluster and local pointer |
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332 | cxy_t inode_cxy = GET_CXY( inode_xp ); |
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333 | vfs_inode_t * inode_ptr = GET_PTR( inode_xp ); |
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334 | |
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335 | hal_remote_atomic_add( XPTR( inode_cxy , &inode_ptr->refcount ) , -1 ); |
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336 | } |
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337 | |
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338 | ////////////////////////////////////////////// |
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339 | uint32_t vfs_inode_get_size( xptr_t inode_xp ) |
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340 | { |
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341 | // get inode cluster and local pointer |
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342 | cxy_t cxy = GET_CXY( inode_xp ); |
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343 | vfs_inode_t * ptr = GET_PTR( inode_xp ); |
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344 | |
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345 | // get size |
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346 | remote_rwlock_rd_lock( XPTR( cxy , &ptr->data_lock ) ); |
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347 | uint32_t size = hal_remote_lw( XPTR( cxy , &ptr->size ) ); |
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348 | remote_rwlock_rd_unlock( XPTR( cxy , &ptr->data_lock ) ); |
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349 | return size; |
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350 | } |
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351 | |
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352 | //////////////////////////////////////////// |
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353 | void vfs_inode_set_size( xptr_t inode_xp, |
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354 | uint32_t size ) |
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355 | { |
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356 | // get inode cluster and local pointer |
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357 | cxy_t cxy = GET_CXY( inode_xp ); |
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358 | vfs_inode_t * ptr = GET_PTR( inode_xp ); |
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359 | |
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360 | // set size |
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361 | remote_rwlock_wr_unlock( XPTR( cxy , &ptr->data_lock ) ); |
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362 | hal_remote_sw( XPTR( cxy , &ptr->size ) , size ); |
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363 | remote_rwlock_wr_unlock( XPTR( cxy , &ptr->data_lock ) ); |
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364 | } |
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365 | |
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366 | //////////////////////////////////////// |
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367 | void vfs_inode_unlock( xptr_t inode_xp ) |
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368 | { |
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369 | // get inode cluster and local pointer |
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370 | cxy_t cxy = GET_CXY( inode_xp ); |
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371 | vfs_inode_t * ptr = GET_PTR( inode_xp ); |
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372 | |
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373 | // release the main lock |
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374 | remote_spinlock_unlock( XPTR( cxy , &ptr->main_lock ) ); |
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375 | } |
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376 | |
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377 | ////////////////////////////////////// |
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378 | void vfs_inode_lock( xptr_t inode_xp ) |
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379 | { |
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380 | // get inode cluster and local pointer |
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381 | cxy_t cxy = GET_CXY( inode_xp ); |
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382 | vfs_inode_t * ptr = GET_PTR( inode_xp ); |
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383 | |
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384 | // get the main lock |
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385 | remote_spinlock_lock( XPTR( cxy , &ptr->main_lock ) ); |
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386 | } |
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387 | |
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388 | ///////////////////////////////////////// |
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389 | void vfs_inode_get_name( xptr_t inode_xp, |
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390 | char * name ) |
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391 | { |
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392 | cxy_t inode_cxy; |
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393 | vfs_inode_t * inode_ptr; |
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394 | xptr_t dentry_xp; |
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395 | cxy_t dentry_cxy; |
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396 | vfs_dentry_t * dentry_ptr; |
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397 | |
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398 | // get inode cluster and local pointer |
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399 | inode_cxy = GET_CXY( inode_xp ); |
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400 | inode_ptr = GET_PTR( inode_xp ); |
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401 | |
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402 | // get parent dentry |
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403 | dentry_xp = hal_remote_lwd( XPTR( inode_cxy , &inode_ptr->parent_xp ) ); |
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404 | |
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405 | // get local copy of name |
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406 | if( dentry_xp == XPTR_NULL ) // it is the VFS root |
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407 | { |
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408 | strcpy( name , "/" ); |
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409 | } |
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410 | else // not the VFS root |
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411 | { |
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412 | dentry_cxy = GET_CXY( dentry_xp ); |
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413 | dentry_ptr = GET_PTR( dentry_xp ); |
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414 | |
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415 | hal_remote_strcpy( XPTR( local_cxy , name ) , |
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416 | XPTR( dentry_cxy , &dentry_ptr->name ) ); |
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417 | } |
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418 | } // end vfs_inode_get_name() |
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419 | |
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420 | //////////////////////////////////////////////////////////////////////////////////////////// |
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421 | // Dentry related functions |
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422 | ////////////////////////////////////////////////////////////////////////////////////////// |
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423 | |
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424 | /////////////////////////////////////////////////// |
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425 | error_t vfs_dentry_create( vfs_fs_type_t fs_type, |
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426 | char * name, |
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427 | vfs_inode_t * parent, |
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428 | xptr_t * dentry_xp ) |
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429 | { |
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430 | vfs_ctx_t * ctx; // context descriptor |
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431 | vfs_dentry_t * dentry; // dentry descriptor (to be allocated) |
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432 | kmem_req_t req; // request to kernel memory allocator |
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433 | error_t error; |
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434 | |
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435 | #if DEBUG_VFS_DENTRY_CREATE |
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436 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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437 | if( DEBUG_VFS_DENTRY_CREATE < cycle ) |
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438 | printk("\n[DBG] %s : thread %x in process %x enter for <%s> / parent_inode %x / cycle %d\n", |
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439 | __FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, 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 | return EINVAL; |
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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 ) return EINVAL; |
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456 | |
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457 | // allocate memory for dentry descriptor |
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458 | req.type = KMEM_VFS_DENTRY; |
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459 | req.size = sizeof(vfs_dentry_t); |
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460 | req.flags = AF_KERNEL | AF_ZERO; |
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461 | dentry = (vfs_dentry_t *)kmem_alloc( &req ); |
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462 | |
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463 | if( dentry == NULL ) return ENOMEM; |
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464 | |
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465 | // initialize dentry descriptor |
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466 | |
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467 | dentry->ctx = ctx; |
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468 | dentry->length = length; |
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469 | dentry->parent = parent; |
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470 | strcpy( dentry->name , name ); |
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471 | |
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472 | #if( DEBUG_VFS_DENTRY_CREATE & 1 ) |
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473 | cycle = (uint32_t)hal_get_cycles(); |
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474 | if( DEBUG_VFS_DENTRY_CREATE < cycle ) |
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475 | printk("\n[DBG] %s : dentry initialised\n", __FUNCTION__ ); |
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476 | #endif |
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477 | |
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478 | // register dentry in hash table rooted in parent inode |
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479 | error = xhtab_insert( XPTR( local_cxy , &parent->children ), |
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480 | name, |
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481 | XPTR( local_cxy , &dentry->list ) ); |
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482 | |
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483 | if( error ) return EINVAL; |
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484 | |
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485 | #if( DEBUG_VFS_DENTRY_CREATE & 1 ) |
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486 | cycle = (uint32_t)hal_get_cycles(); |
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487 | if( DEBUG_VFS_DENTRY_CREATE < cycle ) |
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488 | printk("\n[DBG] %s : dentry registerd in htab\n", __FUNCTION__ ); |
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489 | #endif |
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490 | |
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491 | // return extended pointer on dentry |
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492 | *dentry_xp = XPTR( local_cxy , dentry ); |
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493 | |
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494 | #if DEBUG_VFS_DENTRY_CREATE |
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495 | cycle = (uint32_t)hal_get_cycles(); |
---|
496 | if( DEBUG_VFS_DENTRY_CREATE < cycle ) |
---|
497 | printk("\n[DBG] %s : thread %x in process %x exit for <%s> / dentry %x / cycle %d\n", |
---|
498 | __FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, name, dentry, cycle ); |
---|
499 | #endif |
---|
500 | |
---|
501 | return 0; |
---|
502 | |
---|
503 | } // end vfs_dentry_create() |
---|
504 | |
---|
505 | /////////////////////////////////////////////////// |
---|
506 | error_t vfs_dentry_destroy( vfs_dentry_t * dentry ) |
---|
507 | { |
---|
508 | error_t error; |
---|
509 | |
---|
510 | assert( (dentry->refcount == 0) , __FUNCTION__ , "dentry refcount non zero\n" ); |
---|
511 | |
---|
512 | // get pointer on parent inode |
---|
513 | vfs_inode_t * parent = dentry->parent; |
---|
514 | |
---|
515 | // remove this dentry from parent inode htab |
---|
516 | error = xhtab_remove( XPTR( local_cxy , &parent->children ), |
---|
517 | dentry->name, |
---|
518 | XPTR( local_cxy , &dentry->list ) ); |
---|
519 | |
---|
520 | if( error ) return EINVAL; |
---|
521 | |
---|
522 | // release memory allocated to dentry |
---|
523 | kmem_req_t req; |
---|
524 | req.ptr = dentry; |
---|
525 | req.type = KMEM_VFS_DENTRY; |
---|
526 | kmem_free( &req ); |
---|
527 | |
---|
528 | return 0; |
---|
529 | } |
---|
530 | |
---|
531 | |
---|
532 | |
---|
533 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
534 | // File descriptor related functions |
---|
535 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
536 | |
---|
537 | ///////////////////////////////////////////// |
---|
538 | error_t vfs_file_create( vfs_inode_t * inode, |
---|
539 | uint32_t attr, |
---|
540 | xptr_t * file_xp ) |
---|
541 | { |
---|
542 | vfs_file_t * file; |
---|
543 | kmem_req_t req; |
---|
544 | |
---|
545 | // allocate memory for new file descriptor |
---|
546 | req.type = KMEM_VFS_FILE; |
---|
547 | req.size = sizeof(vfs_file_t); |
---|
548 | req.flags = AF_KERNEL | AF_ZERO; |
---|
549 | file = (vfs_file_t *)kmem_alloc( &req ); |
---|
550 | |
---|
551 | if( file == NULL ) return ENOMEM; |
---|
552 | |
---|
553 | // initializes new file descriptor |
---|
554 | file->gc = 0; |
---|
555 | file->type = inode->type; |
---|
556 | file->attr = attr; |
---|
557 | file->offset = 0; |
---|
558 | file->refcount = 1; |
---|
559 | file->inode = inode; |
---|
560 | file->ctx = inode->ctx; |
---|
561 | file->mapper = inode->mapper; |
---|
562 | |
---|
563 | remote_rwlock_init( XPTR( local_cxy , &file->lock ) ); |
---|
564 | |
---|
565 | *file_xp = XPTR( local_cxy , file ); |
---|
566 | |
---|
567 | #if DEBUG_VFS_OPEN |
---|
568 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
569 | if( DEBUG_VFS_OPEN < cycle ) |
---|
570 | printk("\n[DBG] %s : thread %x in process %x created file %x in cluster %x / cycle %d\n", |
---|
571 | __FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, file, local_cxy, cycle ); |
---|
572 | #endif |
---|
573 | |
---|
574 | return 0; |
---|
575 | |
---|
576 | } // end vfs_file_create() |
---|
577 | |
---|
578 | /////////////////////////////////////////// |
---|
579 | void vfs_file_destroy( vfs_file_t * file ) |
---|
580 | { |
---|
581 | if( file->refcount ) |
---|
582 | { |
---|
583 | assert( false , __FUNCTION__ , "refcount non zero\n" ); |
---|
584 | } |
---|
585 | |
---|
586 | kmem_req_t req; |
---|
587 | req.ptr = file; |
---|
588 | req.type = KMEM_VFS_FILE; |
---|
589 | kmem_free( &req ); |
---|
590 | |
---|
591 | #if DEBUG_VFS_CLOSE |
---|
592 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
593 | if( DEBUG_VFS_CLOSE < cycle ) |
---|
594 | printk("\n[DBG] %s : thread %x in process %x deleted file %x in cluster %x / cycle %d\n", |
---|
595 | __FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, file, local_cxy, cycle ); |
---|
596 | #endif |
---|
597 | |
---|
598 | } // end vfs_file_destroy() |
---|
599 | |
---|
600 | |
---|
601 | //////////////////////////////////////// |
---|
602 | void vfs_file_count_up( xptr_t file_xp ) |
---|
603 | { |
---|
604 | // get file cluster and local pointer |
---|
605 | cxy_t file_cxy = GET_CXY( file_xp ); |
---|
606 | vfs_file_t * file_ptr = GET_PTR( file_xp ); |
---|
607 | |
---|
608 | // atomically increment count |
---|
609 | hal_remote_atomic_add( XPTR( file_cxy , &file_ptr->refcount ) , 1 ); |
---|
610 | } |
---|
611 | |
---|
612 | ////////////////////////////////////////// |
---|
613 | void vfs_file_count_down( xptr_t file_xp ) |
---|
614 | { |
---|
615 | // get file cluster and local pointer |
---|
616 | cxy_t file_cxy = GET_CXY( file_xp ); |
---|
617 | vfs_file_t * file_ptr = GET_PTR( file_xp ); |
---|
618 | |
---|
619 | // atomically decrement count |
---|
620 | hal_remote_atomic_add( XPTR( file_cxy , &file_ptr->refcount ) , -1 ); |
---|
621 | } |
---|
622 | |
---|
623 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
624 | // File access related functions |
---|
625 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
626 | |
---|
627 | ////////////////////////////////////// |
---|
628 | error_t vfs_open( process_t * process, |
---|
629 | char * path, |
---|
630 | uint32_t flags, |
---|
631 | uint32_t mode, |
---|
632 | xptr_t * new_file_xp, |
---|
633 | uint32_t * new_file_id ) |
---|
634 | { |
---|
635 | error_t error; |
---|
636 | xptr_t inode_xp; // extended pointer on target inode |
---|
637 | cxy_t inode_cxy; // inode cluster identifier |
---|
638 | vfs_inode_t * inode_ptr; // inode local pointer |
---|
639 | uint32_t file_attr; // file descriptor attributes |
---|
640 | uint32_t lookup_mode; // lookup working mode |
---|
641 | xptr_t file_xp; // extended pointer on created file descriptor |
---|
642 | uint32_t file_id; // created file descriptor index in reference fd_array |
---|
643 | |
---|
644 | assert( (mode == 0), __FUNCTION__, |
---|
645 | "the mode parameter is not supported yet\n" ); |
---|
646 | |
---|
647 | #if DEBUG_VFS_OPEN |
---|
648 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
649 | if( DEBUG_VFS_OPEN < cycle ) |
---|
650 | printk("\n[DBG] %s : thread %x in process %x enter for <%s> / cycle %d\n", |
---|
651 | __FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, path, cycle ); |
---|
652 | #endif |
---|
653 | |
---|
654 | // compute lookup working mode |
---|
655 | lookup_mode = VFS_LOOKUP_OPEN; |
---|
656 | if( (flags & O_DIR ) ) lookup_mode |= VFS_LOOKUP_DIR; |
---|
657 | if( (flags & O_CREAT ) ) lookup_mode |= VFS_LOOKUP_CREATE; |
---|
658 | if( (flags & O_EXCL ) ) lookup_mode |= VFS_LOOKUP_EXCL; |
---|
659 | |
---|
660 | // compute attributes for the created file |
---|
661 | file_attr = 0; |
---|
662 | if( (flags & O_RDONLY ) == 0 ) file_attr |= FD_ATTR_WRITE_ENABLE; |
---|
663 | if( (flags & O_WRONLY ) == 0 ) file_attr |= FD_ATTR_READ_ENABLE; |
---|
664 | if( (flags & O_SYNC ) ) file_attr |= FD_ATTR_SYNC; |
---|
665 | if( (flags & O_APPEND ) ) file_attr |= FD_ATTR_APPEND; |
---|
666 | if( (flags & O_CLOEXEC) ) file_attr |= FD_ATTR_CLOSE_EXEC; |
---|
667 | |
---|
668 | // get extended pointer on target inode |
---|
669 | error = vfs_lookup( process->vfs_cwd_xp , path , lookup_mode , &inode_xp ); |
---|
670 | |
---|
671 | if( error ) return error; |
---|
672 | |
---|
673 | // get target inode cluster and local pointer |
---|
674 | inode_cxy = GET_CXY( inode_xp ); |
---|
675 | inode_ptr = GET_PTR( inode_xp ); |
---|
676 | |
---|
677 | // create a new file descriptor in cluster containing inode |
---|
678 | if( inode_cxy == local_cxy ) // target cluster is local |
---|
679 | { |
---|
680 | error = vfs_file_create( inode_ptr , file_attr , &file_xp ); |
---|
681 | } |
---|
682 | else // target cluster is remote |
---|
683 | { |
---|
684 | rpc_vfs_file_create_client( inode_cxy , inode_ptr , file_attr , &file_xp , &error ); |
---|
685 | } |
---|
686 | |
---|
687 | if( error ) return error; |
---|
688 | |
---|
689 | // allocate and register a new file descriptor index in reference process |
---|
690 | error = process_fd_register( process , file_xp , &file_id ); |
---|
691 | |
---|
692 | if( error ) return error; |
---|
693 | |
---|
694 | #if DEBUG_VFS_OPEN |
---|
695 | cycle = (uint32_t)hal_get_cycles(); |
---|
696 | if( DEBUG_VFS_OPEN < cycle ) |
---|
697 | printk("\n[DBG] %s : thread %x in process %x exit for <%s> / fdid %d / cluster %x / cycle %d\n", |
---|
698 | __FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, path, |
---|
699 | file_id, GET_CXY( file_xp ), cycle ); |
---|
700 | #endif |
---|
701 | |
---|
702 | // success |
---|
703 | *new_file_xp = file_xp; |
---|
704 | *new_file_id = file_id; |
---|
705 | return 0; |
---|
706 | |
---|
707 | } // end vfs_open() |
---|
708 | |
---|
709 | ////////////////////////////////////// |
---|
710 | int vfs_user_move( bool_t to_buffer, |
---|
711 | xptr_t file_xp, |
---|
712 | void * buffer, |
---|
713 | uint32_t size ) |
---|
714 | { |
---|
715 | assert( ( file_xp != XPTR_NULL ) , __FUNCTION__ , "file_xp == XPTR_NULL" ); |
---|
716 | |
---|
717 | cxy_t file_cxy; // remote file descriptor cluster |
---|
718 | vfs_file_t * file_ptr; // remote file descriptor local pointer |
---|
719 | vfs_inode_type_t inode_type; |
---|
720 | uint32_t file_offset; // current offset in file |
---|
721 | mapper_t * mapper; |
---|
722 | error_t error; |
---|
723 | |
---|
724 | // get cluster and local pointer on remote file descriptor |
---|
725 | file_cxy = GET_CXY( file_xp ); |
---|
726 | file_ptr = GET_PTR( file_xp ); |
---|
727 | |
---|
728 | // get inode type from remote file descriptor |
---|
729 | inode_type = hal_remote_lw( XPTR( file_cxy , &file_ptr->type ) ); |
---|
730 | |
---|
731 | assert( (inode_type == INODE_TYPE_FILE) , __FUNCTION__ , |
---|
732 | "inode type is not INODE_TYPE_FILE" ); |
---|
733 | |
---|
734 | // get mapper pointer and file offset from file descriptor |
---|
735 | file_offset = hal_remote_lw( XPTR( file_cxy , &file_ptr->offset ) ); |
---|
736 | mapper = (mapper_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->mapper ) ); |
---|
737 | |
---|
738 | // move data between mapper and buffer |
---|
739 | if( file_cxy == local_cxy ) |
---|
740 | { |
---|
741 | error = mapper_move_user( mapper, |
---|
742 | to_buffer, |
---|
743 | file_offset, |
---|
744 | buffer, |
---|
745 | size ); |
---|
746 | } |
---|
747 | else |
---|
748 | { |
---|
749 | rpc_mapper_move_buffer_client( file_cxy, |
---|
750 | mapper, |
---|
751 | to_buffer, |
---|
752 | true, // user buffer |
---|
753 | file_offset, |
---|
754 | (uint64_t)(intptr_t)buffer, |
---|
755 | size, |
---|
756 | &error ); |
---|
757 | } |
---|
758 | |
---|
759 | if( error ) return -1; |
---|
760 | else return size; |
---|
761 | |
---|
762 | } // end vfs_user_move() |
---|
763 | |
---|
764 | //////////////////////////////////////////// |
---|
765 | error_t vfs_kernel_move( bool_t to_buffer, |
---|
766 | xptr_t file_xp, |
---|
767 | xptr_t buffer_xp, |
---|
768 | uint32_t size ) |
---|
769 | { |
---|
770 | assert( ( file_xp != XPTR_NULL ) , __FUNCTION__ , "file_xp == XPTR_NULL" ); |
---|
771 | |
---|
772 | cxy_t file_cxy; // remote file descriptor cluster |
---|
773 | vfs_file_t * file_ptr; // remote file descriptor local pointer |
---|
774 | vfs_inode_type_t inode_type; |
---|
775 | uint32_t file_offset; // current offset in file |
---|
776 | mapper_t * mapper; |
---|
777 | error_t error; |
---|
778 | |
---|
779 | // get cluster and local pointer on remote file descriptor |
---|
780 | file_cxy = GET_CXY( file_xp ); |
---|
781 | file_ptr = GET_PTR( file_xp ); |
---|
782 | |
---|
783 | // get inode type from remote file descriptor |
---|
784 | inode_type = hal_remote_lw( XPTR( file_cxy , &file_ptr->type ) ); |
---|
785 | |
---|
786 | // action depends on inode type |
---|
787 | if( inode_type == INODE_TYPE_FILE ) |
---|
788 | { |
---|
789 | // get mapper pointer and file offset from file descriptor |
---|
790 | file_offset = hal_remote_lw( XPTR( file_cxy , &file_ptr->offset ) ); |
---|
791 | mapper = (mapper_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->mapper ) ); |
---|
792 | |
---|
793 | // move data between mapper and buffer |
---|
794 | if( file_cxy == local_cxy ) |
---|
795 | { |
---|
796 | error = mapper_move_kernel( mapper, |
---|
797 | to_buffer, |
---|
798 | file_offset, |
---|
799 | buffer_xp, |
---|
800 | size ); |
---|
801 | } |
---|
802 | else |
---|
803 | { |
---|
804 | rpc_mapper_move_buffer_client( file_cxy, |
---|
805 | mapper, |
---|
806 | to_buffer, |
---|
807 | false, // kernel buffer |
---|
808 | file_offset, |
---|
809 | buffer_xp, |
---|
810 | size, |
---|
811 | &error ); |
---|
812 | } |
---|
813 | |
---|
814 | if( error ) return -1; |
---|
815 | else return 0; |
---|
816 | } |
---|
817 | else |
---|
818 | { |
---|
819 | printk("\n[ERROR] in %s : inode is not a file", __FUNCTION__ ); |
---|
820 | return -1; |
---|
821 | } |
---|
822 | } // end vfs_kernel_move() |
---|
823 | |
---|
824 | ////////////////////////////////////// |
---|
825 | error_t vfs_lseek( xptr_t file_xp, |
---|
826 | uint32_t offset, |
---|
827 | uint32_t whence, |
---|
828 | uint32_t * new_offset ) |
---|
829 | { |
---|
830 | xptr_t offset_xp; |
---|
831 | xptr_t lock_xp; |
---|
832 | cxy_t file_cxy; |
---|
833 | vfs_file_t * file_ptr; |
---|
834 | vfs_inode_t * inode_ptr; |
---|
835 | uint32_t new; |
---|
836 | |
---|
837 | assert( (file_xp != XPTR_NULL) , __FUNCTION__ , "file_xp == XPTR_NULL" ); |
---|
838 | |
---|
839 | // get cluster and local pointer on remote file descriptor |
---|
840 | file_cxy = GET_CXY( file_xp ); |
---|
841 | file_ptr = GET_PTR( file_xp ); |
---|
842 | |
---|
843 | // build extended pointers on lock and offset |
---|
844 | offset_xp = XPTR( file_cxy , &file_ptr->offset ); |
---|
845 | lock_xp = XPTR( file_cxy , &file_ptr->lock ); |
---|
846 | |
---|
847 | // take file descriptor lock |
---|
848 | remote_rwlock_wr_lock( lock_xp ); |
---|
849 | |
---|
850 | if ( whence == SEEK_CUR ) // new = current + offset |
---|
851 | { |
---|
852 | new = hal_remote_lw( offset_xp ) + offset; |
---|
853 | } |
---|
854 | else if ( whence == SEEK_SET ) // new = offset |
---|
855 | { |
---|
856 | new = offset; |
---|
857 | } |
---|
858 | else if ( whence == SEEK_END ) // new = size + offset |
---|
859 | { |
---|
860 | // get local pointer on remote inode |
---|
861 | inode_ptr = (vfs_inode_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) ); |
---|
862 | |
---|
863 | new = hal_remote_lw( XPTR( file_cxy , &inode_ptr->size ) ) + offset; |
---|
864 | } |
---|
865 | else |
---|
866 | { |
---|
867 | printk("\n[ERROR] in %s : illegal whence value\n", __FUNCTION__ ); |
---|
868 | remote_rwlock_wr_unlock( lock_xp ); |
---|
869 | return -1; |
---|
870 | } |
---|
871 | |
---|
872 | // set new offset |
---|
873 | hal_remote_sw( offset_xp , new ); |
---|
874 | |
---|
875 | // release file descriptor lock |
---|
876 | remote_rwlock_wr_unlock( lock_xp ); |
---|
877 | |
---|
878 | // success |
---|
879 | if ( new_offset != NULL ) |
---|
880 | *new_offset = new; |
---|
881 | return 0; |
---|
882 | |
---|
883 | } // vfs_lseek() |
---|
884 | |
---|
885 | /////////////////////////////////// |
---|
886 | error_t vfs_close( xptr_t file_xp, |
---|
887 | uint32_t file_id ) |
---|
888 | { |
---|
889 | cluster_t * cluster; // local pointer on local cluster |
---|
890 | cxy_t file_cxy; // cluster containing the file descriptor. |
---|
891 | vfs_file_t * file_ptr; // local ponter on file descriptor |
---|
892 | cxy_t owner_cxy; // process owner cluster |
---|
893 | lpid_t lpid; // process local index |
---|
894 | xptr_t root_xp; // root of list of process copies |
---|
895 | xptr_t lock_xp; // lock protecting the list of copies |
---|
896 | xptr_t iter_xp; // iterator on list of process copies |
---|
897 | xptr_t process_xp; // extended pointer on one process copy |
---|
898 | cxy_t process_cxy; // process copy cluster |
---|
899 | process_t * process_ptr; // process copy local pointer |
---|
900 | |
---|
901 | assert( (file_xp != XPTR_NULL) , __FUNCTION__ , "file_xp == XPTR_NULL" ); |
---|
902 | |
---|
903 | assert( (file_id < CONFIG_PROCESS_FILE_MAX_NR) , __FUNCTION__ , "illegal file_id" ); |
---|
904 | |
---|
905 | thread_t * this = CURRENT_THREAD; |
---|
906 | process_t * process = this->process; |
---|
907 | |
---|
908 | #if DEBUG_VFS_CLOSE |
---|
909 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
910 | if( DEBUG_VFS_CLOSE < cycle ) |
---|
911 | printk("\n[DBG] %s : thread %x in process %x enter / fdid %d / cycle %d\n", |
---|
912 | __FUNCTION__, this->trdid, process->pid, file_id, cycle ); |
---|
913 | #endif |
---|
914 | |
---|
915 | // get local pointer on local cluster manager |
---|
916 | cluster = LOCAL_CLUSTER; |
---|
917 | |
---|
918 | // get owner process cluster and lpid |
---|
919 | owner_cxy = CXY_FROM_PID( process->pid ); |
---|
920 | lpid = LPID_FROM_PID( process->pid ); |
---|
921 | |
---|
922 | // get extended pointers on copies root and lock |
---|
923 | root_xp = XPTR( owner_cxy , &cluster->pmgr.copies_root[lpid] ); |
---|
924 | lock_xp = XPTR( owner_cxy , &cluster->pmgr.copies_lock[lpid] ); |
---|
925 | |
---|
926 | // 1) loop on the process descriptor copies to reset all fd_array[file_id] entries |
---|
927 | |
---|
928 | // take the lock protecting the list of copies |
---|
929 | remote_spinlock_lock( lock_xp ); |
---|
930 | |
---|
931 | XLIST_FOREACH( root_xp , iter_xp ) |
---|
932 | { |
---|
933 | process_xp = XLIST_ELEMENT( iter_xp , process_t , copies_list ); |
---|
934 | process_cxy = GET_CXY( process_xp ); |
---|
935 | process_ptr = GET_PTR( process_xp ); |
---|
936 | |
---|
937 | #if (DEBUG_VFS_CLOSE & 1 ) |
---|
938 | if( DEBUG_VFS_CLOSE < cycle ) |
---|
939 | printk("\n[DBG] %s : reset fd_array[%d] for process %x in cluster %x\n", |
---|
940 | __FUNCTION__, file_id, process_ptr, process_cxy ); |
---|
941 | #endif |
---|
942 | |
---|
943 | // fd_array lock is required for atomic write of a 64 bits word |
---|
944 | // xptr_t fd_array_lock_xp = XPTR( process_cxy , &process_ptr->fd_array.lock ); |
---|
945 | |
---|
946 | xptr_t entry_xp = XPTR( process_cxy , &process_ptr->fd_array.array[file_id] ); |
---|
947 | |
---|
948 | // remote_rwlock_wr_lock( fd_array_lock_xp ); |
---|
949 | |
---|
950 | hal_remote_swd( entry_xp , XPTR_NULL ); |
---|
951 | |
---|
952 | // remote_rwlock_wr_unlock( fd_array_lock_xp ); |
---|
953 | |
---|
954 | vfs_file_count_down( file_xp ); |
---|
955 | |
---|
956 | hal_fence(); |
---|
957 | } |
---|
958 | |
---|
959 | // release the lock protecting the list of copies |
---|
960 | remote_spinlock_unlock( lock_xp ); |
---|
961 | |
---|
962 | #if (DEBUG_VFS_CLOSE & 1) |
---|
963 | if( DEBUG_VFS_CLOSE < cycle ) |
---|
964 | printk("\n[DBG] %s : thread %x in process %x reset all fd-array copies\n", |
---|
965 | __FUNCTION__, this->trdid, process->pid ); |
---|
966 | #endif |
---|
967 | |
---|
968 | // 2) release memory allocated to file descriptor in remote cluster |
---|
969 | |
---|
970 | // get cluster and local pointer on remote file descriptor |
---|
971 | file_cxy = GET_CXY( file_xp ); |
---|
972 | file_ptr = GET_PTR( file_xp ); |
---|
973 | |
---|
974 | if( file_cxy == local_cxy ) // file cluster is local |
---|
975 | { |
---|
976 | vfs_file_destroy( file_ptr ); |
---|
977 | } |
---|
978 | else // file cluster is local |
---|
979 | { |
---|
980 | rpc_vfs_file_destroy_client( file_cxy , file_ptr ); |
---|
981 | } |
---|
982 | |
---|
983 | #if DEBUG_VFS_CLOSE |
---|
984 | cycle = (uint32_t)hal_get_cycles(); |
---|
985 | if( DEBUG_VFS_CLOSE < cycle ) |
---|
986 | printk("\n[DBG] %s : thread %x in process %x exit / fdid %d closed / cycle %d\n", |
---|
987 | __FUNCTION__, this->trdid, process->pid, file_id, cycle ); |
---|
988 | #endif |
---|
989 | |
---|
990 | return 0; |
---|
991 | |
---|
992 | } // end vfs_close() |
---|
993 | |
---|
994 | //////////////////////////////////// |
---|
995 | error_t vfs_unlink( xptr_t cwd_xp, |
---|
996 | char * path ) |
---|
997 | { |
---|
998 | assert( false , __FUNCTION__ , "not implemented\n", cwd_xp, path ); |
---|
999 | return 0; |
---|
1000 | } |
---|
1001 | |
---|
1002 | //////////////////////////////////////// |
---|
1003 | error_t vfs_stat( xptr_t file_xp, |
---|
1004 | struct stat * k_stat ) |
---|
1005 | { |
---|
1006 | assert( false , __FUNCTION__ , "not implemented\n", file_xp, k_stat ); |
---|
1007 | return 0; |
---|
1008 | } |
---|
1009 | |
---|
1010 | ///////////////////////////////////////////// |
---|
1011 | error_t vfs_readdir( xptr_t file_xp, |
---|
1012 | struct dirent * k_dirent ) |
---|
1013 | { |
---|
1014 | assert( false , __FUNCTION__ , "not implemented\n", file_xp, k_dirent ); |
---|
1015 | return 0; |
---|
1016 | } |
---|
1017 | |
---|
1018 | ////////////////////////////////////// |
---|
1019 | error_t vfs_mkdir( xptr_t file_xp, |
---|
1020 | char * path, |
---|
1021 | uint32_t mode ) |
---|
1022 | { |
---|
1023 | assert( false , __FUNCTION__ , "not implemented\n", file_xp, path, mode ); |
---|
1024 | return 0; |
---|
1025 | } |
---|
1026 | |
---|
1027 | //////////////////////////////////// |
---|
1028 | error_t vfs_rmdir( xptr_t file_xp, |
---|
1029 | char * path ) |
---|
1030 | { |
---|
1031 | assert( false , __FUNCTION__ , "not implemented\n", file_xp, path ); |
---|
1032 | return 0; |
---|
1033 | } |
---|
1034 | |
---|
1035 | /////////////////////////////////// |
---|
1036 | error_t vfs_chdir( xptr_t cwd_xp, |
---|
1037 | char * path ) |
---|
1038 | { |
---|
1039 | error_t error; |
---|
1040 | xptr_t inode_xp; // extended pointer on target inode |
---|
1041 | cxy_t inode_cxy; // target inode cluster identifier |
---|
1042 | vfs_inode_t * inode_ptr; // target inode local pointer |
---|
1043 | uint32_t mode; // lookup working mode |
---|
1044 | vfs_inode_type_t inode_type; // target inode type |
---|
1045 | |
---|
1046 | // set lookup working mode |
---|
1047 | mode = 0; |
---|
1048 | |
---|
1049 | // get extended pointer on target inode |
---|
1050 | error = vfs_lookup( cwd_xp , path , mode , &inode_xp ); |
---|
1051 | |
---|
1052 | if( error ) return error; |
---|
1053 | |
---|
1054 | // get inode cluster and local pointer |
---|
1055 | inode_cxy = GET_CXY( inode_xp ); |
---|
1056 | inode_ptr = GET_PTR( inode_xp ); |
---|
1057 | |
---|
1058 | // get inode type from remote file |
---|
1059 | inode_type = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->type ) ); |
---|
1060 | |
---|
1061 | if( inode_type != INODE_TYPE_DIR ) |
---|
1062 | { |
---|
1063 | CURRENT_THREAD->errno = ENOTDIR; |
---|
1064 | return -1; |
---|
1065 | } |
---|
1066 | |
---|
1067 | assert( false , __FUNCTION__ , "not implemented\n" ); |
---|
1068 | return 0; |
---|
1069 | } |
---|
1070 | |
---|
1071 | /////////////////////////////////// |
---|
1072 | error_t vfs_chmod( xptr_t cwd_xp, |
---|
1073 | char * path, |
---|
1074 | uint32_t rights ) |
---|
1075 | { |
---|
1076 | error_t error; |
---|
1077 | xptr_t inode_xp; // extended pointer on target inode |
---|
1078 | cxy_t inode_cxy; // inode cluster identifier |
---|
1079 | vfs_inode_t * inode_ptr; // inode local pointer |
---|
1080 | vfs_inode_type_t inode_type; // target inode type |
---|
1081 | |
---|
1082 | // set lookup working mode |
---|
1083 | assert( (rights == 0), __FUNCTION__, |
---|
1084 | "access rights non implemented yet\n" ); |
---|
1085 | |
---|
1086 | // get extended pointer on target inode |
---|
1087 | error = vfs_lookup( cwd_xp , path , 0 , &inode_xp ); |
---|
1088 | |
---|
1089 | if( error ) return error; |
---|
1090 | |
---|
1091 | // get inode cluster and local pointer |
---|
1092 | inode_cxy = GET_CXY( inode_xp ); |
---|
1093 | inode_ptr = GET_PTR( inode_xp ); |
---|
1094 | |
---|
1095 | // get inode type from remote inode |
---|
1096 | inode_type = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->type ) ); |
---|
1097 | |
---|
1098 | |
---|
1099 | assert( false , __FUNCTION__ , "not implemented\n" ); |
---|
1100 | return 0; |
---|
1101 | } |
---|
1102 | |
---|
1103 | /////////////////////////////////// |
---|
1104 | error_t vfs_mkfifo( xptr_t cwd_xp, |
---|
1105 | char * path, |
---|
1106 | uint32_t rights ) |
---|
1107 | { |
---|
1108 | assert( false , __FUNCTION__ , "not implemented\n", cwd_xp, path, rights ); |
---|
1109 | return 0; |
---|
1110 | } |
---|
1111 | |
---|
1112 | |
---|
1113 | |
---|
1114 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1115 | // Inode Tree functions |
---|
1116 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1117 | |
---|
1118 | ///////////////////////////////// |
---|
1119 | cxy_t vfs_cluster_random_select() |
---|
1120 | { |
---|
1121 | uint32_t x_size = LOCAL_CLUSTER->x_size; |
---|
1122 | uint32_t y_size = LOCAL_CLUSTER->y_size; |
---|
1123 | uint32_t y_width = LOCAL_CLUSTER->y_width; |
---|
1124 | uint32_t index = ( hal_get_cycles() + hal_get_gid() ) % (x_size * y_size); |
---|
1125 | uint32_t x = index / y_size; |
---|
1126 | uint32_t y = index % y_size; |
---|
1127 | |
---|
1128 | return (x<<y_width) + y; |
---|
1129 | } |
---|
1130 | |
---|
1131 | |
---|
1132 | ////////////////////////////////////////////////////////////////////////// |
---|
1133 | // This static function is called by the vfs_display() function. |
---|
1134 | // that is supposed to take the TXT0 lock. |
---|
1135 | ////////////////////////////////////////////////////////////////////////// |
---|
1136 | static void vfs_recursive_display( xptr_t inode_xp, |
---|
1137 | xptr_t name_xp, |
---|
1138 | uint32_t indent ) |
---|
1139 | { |
---|
1140 | cxy_t inode_cxy; |
---|
1141 | vfs_inode_t * inode_ptr; |
---|
1142 | vfs_inode_type_t inode_type; |
---|
1143 | xptr_t children_xp; // extended pointer on children xhtab |
---|
1144 | |
---|
1145 | xptr_t child_dentry_xp; |
---|
1146 | cxy_t child_dentry_cxy; |
---|
1147 | vfs_dentry_t * child_dentry_ptr; |
---|
1148 | xptr_t child_inode_xp; |
---|
1149 | xptr_t child_dentry_name_xp; |
---|
1150 | |
---|
1151 | char name[CONFIG_VFS_MAX_NAME_LENGTH]; |
---|
1152 | |
---|
1153 | char * indent_str[] = { "", // level 0 |
---|
1154 | " ", // level 1 |
---|
1155 | " ", // level 2 |
---|
1156 | " ", // level 3 |
---|
1157 | " ", // level 4 |
---|
1158 | " ", // level 5 |
---|
1159 | " ", // level 6 |
---|
1160 | " ", // level 7 |
---|
1161 | " ", // level 8 |
---|
1162 | " ", // level 9 |
---|
1163 | " ", // level 10 |
---|
1164 | " ", // level 11 |
---|
1165 | " ", // level 12 |
---|
1166 | " ", // level 13 |
---|
1167 | " ", // level 14 |
---|
1168 | " " }; // level 15 |
---|
1169 | |
---|
1170 | assert( (inode_xp != XPTR_NULL) , __FUNCTION__ , "inode_xp cannot be NULL\n" ); |
---|
1171 | assert( (name_xp != XPTR_NULL) , __FUNCTION__ , "name_xp cannot be NULL\n" ); |
---|
1172 | assert( (indent < 16) , __FUNCTION__ , "depth cannot be larger than 15\n" ); |
---|
1173 | |
---|
1174 | // get inode cluster and local pointer |
---|
1175 | inode_cxy = GET_CXY( inode_xp ); |
---|
1176 | inode_ptr = GET_PTR( inode_xp ); |
---|
1177 | |
---|
1178 | // get inode type |
---|
1179 | inode_type = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->type ) ); |
---|
1180 | |
---|
1181 | // get local pointer on associated mapper |
---|
1182 | mapper_t * mapper_ptr = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) ); |
---|
1183 | |
---|
1184 | // make a local copy of node name |
---|
1185 | hal_remote_strcpy( XPTR( local_cxy , name ) , name_xp ); |
---|
1186 | |
---|
1187 | // display inode |
---|
1188 | nolock_printk("%s%s <%s> : inode = %x / mapper = %x / cluster %x\n", |
---|
1189 | indent_str[indent], vfs_inode_type_str( inode_type ), name, |
---|
1190 | inode_ptr , mapper_ptr , inode_cxy ); |
---|
1191 | |
---|
1192 | // scan directory entries |
---|
1193 | if( inode_type == INODE_TYPE_DIR ) |
---|
1194 | { |
---|
1195 | // get extended pointer on directory entries xhtab |
---|
1196 | children_xp = XPTR( inode_cxy , &inode_ptr->children ); |
---|
1197 | |
---|
1198 | // get xhtab lock |
---|
1199 | xhtab_read_lock( children_xp ); |
---|
1200 | |
---|
1201 | // get first dentry from xhtab |
---|
1202 | child_dentry_xp = xhtab_get_first( children_xp ); |
---|
1203 | |
---|
1204 | while( child_dentry_xp != XPTR_NULL ) |
---|
1205 | { |
---|
1206 | // get dentry cluster and local pointer |
---|
1207 | child_dentry_cxy = GET_CXY( child_dentry_xp ); |
---|
1208 | child_dentry_ptr = GET_PTR( child_dentry_xp ); |
---|
1209 | |
---|
1210 | // get extended pointer on child inode |
---|
1211 | child_inode_xp = hal_remote_lwd( XPTR( child_dentry_cxy, |
---|
1212 | &child_dentry_ptr->child_xp ) ); |
---|
1213 | |
---|
1214 | // get extended pointer on dentry name |
---|
1215 | child_dentry_name_xp = XPTR( child_dentry_cxy , &child_dentry_ptr->name ); |
---|
1216 | |
---|
1217 | // recursive call on child inode |
---|
1218 | vfs_recursive_display( child_inode_xp, |
---|
1219 | child_dentry_name_xp, |
---|
1220 | indent+1 ); |
---|
1221 | |
---|
1222 | // get next dentry |
---|
1223 | child_dentry_xp = xhtab_get_next( children_xp ); |
---|
1224 | } |
---|
1225 | |
---|
1226 | // release xhtab lock |
---|
1227 | xhtab_read_unlock( children_xp ); |
---|
1228 | } |
---|
1229 | } // end vfs_recursive_display() |
---|
1230 | |
---|
1231 | /////////////////////////////////// |
---|
1232 | void vfs_display( xptr_t inode_xp ) |
---|
1233 | { |
---|
1234 | xptr_t name_xp; |
---|
1235 | xptr_t dentry_xp; |
---|
1236 | cxy_t dentry_cxy; |
---|
1237 | vfs_dentry_t * dentry_ptr; |
---|
1238 | uint32_t save_sr; |
---|
1239 | |
---|
1240 | // get target inode cluster and local pointer |
---|
1241 | cxy_t inode_cxy = GET_CXY( inode_xp ); |
---|
1242 | vfs_inode_t * inode_ptr = GET_PTR( inode_xp ); |
---|
1243 | |
---|
1244 | // get extended pointer on associated dentry |
---|
1245 | dentry_xp = hal_remote_lwd( XPTR( inode_cxy , &inode_ptr->parent_xp ) ); |
---|
1246 | |
---|
1247 | // check if target inode is the File System root |
---|
1248 | if( dentry_xp == XPTR_NULL ) |
---|
1249 | { |
---|
1250 | // build extended pointer on root name |
---|
1251 | name_xp = XPTR( local_cxy , "/" ); |
---|
1252 | } |
---|
1253 | else |
---|
1254 | { |
---|
1255 | // get dentry cluster and local pointer |
---|
1256 | dentry_cxy = GET_CXY( dentry_xp ); |
---|
1257 | dentry_ptr = GET_PTR( dentry_xp ); |
---|
1258 | |
---|
1259 | // get extended pointer on dentry name |
---|
1260 | name_xp = XPTR( dentry_cxy , &dentry_ptr->name ); |
---|
1261 | } |
---|
1262 | |
---|
1263 | // get pointers on TXT0 chdev |
---|
1264 | xptr_t txt0_xp = chdev_dir.txt_tx[0]; |
---|
1265 | cxy_t txt0_cxy = GET_CXY( txt0_xp ); |
---|
1266 | chdev_t * txt0_ptr = GET_PTR( txt0_xp ); |
---|
1267 | |
---|
1268 | // get extended pointer on remote TXT0 chdev lock |
---|
1269 | xptr_t lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock ); |
---|
1270 | |
---|
1271 | // get TXT0 lock in busy waiting mode |
---|
1272 | remote_spinlock_lock_busy( lock_xp , &save_sr ); |
---|
1273 | |
---|
1274 | // print header |
---|
1275 | nolock_printk("\n***** file system state\n\n"); |
---|
1276 | |
---|
1277 | // call recursive function |
---|
1278 | vfs_recursive_display( inode_xp , name_xp , 0 ); |
---|
1279 | |
---|
1280 | // release lock |
---|
1281 | remote_spinlock_unlock_busy( lock_xp , save_sr ); |
---|
1282 | |
---|
1283 | } // end vfs_display() |
---|
1284 | |
---|
1285 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1286 | // This function is used by the vfs_lookup() function. |
---|
1287 | // It takes an extended pointer on a remote inode (parent directory inode), |
---|
1288 | // and check access_rights violation for the calling thread. |
---|
1289 | // It can be used by any thread running in any cluster. |
---|
1290 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1291 | // @ inode_xp : extended pointer on inode. |
---|
1292 | // @ client_uid : client thread user ID |
---|
1293 | // @ client_gid : client thread group ID |
---|
1294 | // @ return true if access rights are violated. |
---|
1295 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1296 | bool_t vfs_access_denied( xptr_t inode_xp, |
---|
1297 | uint32_t client_uid, |
---|
1298 | uint32_t client_gid ) |
---|
1299 | { |
---|
1300 | // get found inode cluster and local pointer |
---|
1301 | cxy_t inode_cxy = GET_CXY( inode_xp ); |
---|
1302 | vfs_inode_t * inode_ptr = GET_PTR( inode_xp ); |
---|
1303 | |
---|
1304 | // get inode access mode, UID, and GID |
---|
1305 | // TODO uint32_t mode = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->mode ) ); |
---|
1306 | uid_t uid = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->uid ) ); |
---|
1307 | gid_t gid = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->gid ) ); |
---|
1308 | |
---|
1309 | // FIXME : me must use mode |
---|
1310 | if( (uid == client_uid) || (gid == client_gid) ) return false; |
---|
1311 | else return true; |
---|
1312 | } |
---|
1313 | |
---|
1314 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1315 | // This static function is used by the vfs_lookup() function. |
---|
1316 | // It takes an extended pointer on a remote parent directory inode, a directory |
---|
1317 | // entry name, and returns an extended pointer on the child inode. |
---|
1318 | // It can be used by any thread running in any cluster. |
---|
1319 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1320 | // @ parent_xp : extended pointer on parent inode in remote cluster. |
---|
1321 | // @ name : dentry name |
---|
1322 | // @ child_xp : [out] buffer for extended pointer on child inode. |
---|
1323 | // @ return true if success / return false if not found. |
---|
1324 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1325 | static bool_t vfs_get_child( xptr_t parent_xp, |
---|
1326 | char * name, |
---|
1327 | xptr_t * child_xp ) |
---|
1328 | { |
---|
1329 | xptr_t xhtab_xp; // extended pointer on hash table containing children dentries |
---|
1330 | xptr_t dentry_xp; // extended pointer on children dentry |
---|
1331 | |
---|
1332 | // get parent inode cluster and local pointer |
---|
1333 | cxy_t parent_cxy = GET_CXY( parent_xp ); |
---|
1334 | vfs_inode_t * parent_ptr = GET_PTR( parent_xp ); |
---|
1335 | |
---|
1336 | // get extended pointer on hash table of children directory entries |
---|
1337 | xhtab_xp = XPTR( parent_cxy , &parent_ptr->children ); |
---|
1338 | |
---|
1339 | // search extended pointer on matching dentry |
---|
1340 | dentry_xp = xhtab_lookup( xhtab_xp , name ); |
---|
1341 | |
---|
1342 | if( dentry_xp == XPTR_NULL ) return false; |
---|
1343 | |
---|
1344 | // get dentry cluster and local pointer |
---|
1345 | cxy_t dentry_cxy = GET_CXY( dentry_xp ); |
---|
1346 | vfs_dentry_t * dentry_ptr = GET_PTR( dentry_xp ); |
---|
1347 | |
---|
1348 | // return child inode |
---|
1349 | *child_xp = (xptr_t)hal_remote_lwd( XPTR( dentry_cxy , &dentry_ptr->child_xp ) ); |
---|
1350 | return true; |
---|
1351 | |
---|
1352 | } // end vfs_get_child() |
---|
1353 | |
---|
1354 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1355 | // This static function is used by the vfs_lookup() function. |
---|
1356 | // It takes the <current> pointer on a buffer containing a complete pathname, and return |
---|
1357 | // in the <name> buffer, allocated by the caller, a single name in the path. |
---|
1358 | // It return also in the <next> pointer the next character to analyse in the path. |
---|
1359 | // Finally it returns a <last> boolean, that is true when the returned <name> is the |
---|
1360 | // last name in the path. The names are supposed to be separated by one or several '/' |
---|
1361 | // characters, that are not written in the <name> buffer. |
---|
1362 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1363 | // @ current : pointer on first character to analyse in buffer containing the path. |
---|
1364 | // @ name : [out] pointer on buffer allocated by the caller for the returned name. |
---|
1365 | // @ next : [out] pointer on next character to analyse in buffer containing the path. |
---|
1366 | // @ last : [out] true if the returned name is the last (NUL character found). |
---|
1367 | // @ return 0 if success / return EINVAL if string empty (first chracter is NUL). |
---|
1368 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1369 | static error_t vfs_get_name_from_path( char * current, |
---|
1370 | char * name, |
---|
1371 | char ** next, |
---|
1372 | bool_t * last ) |
---|
1373 | { |
---|
1374 | char * ptr = current; |
---|
1375 | |
---|
1376 | // skip leading '/' characters |
---|
1377 | while( *ptr == '/' ) ptr++; |
---|
1378 | |
---|
1379 | // return EINVAL if string empty |
---|
1380 | if( *ptr == 0 ) return EINVAL; |
---|
1381 | |
---|
1382 | // copy all characters in name until NUL or '/' |
---|
1383 | while( (*ptr != 0) && (*ptr !='/') ) *(name++) = *(ptr++); |
---|
1384 | |
---|
1385 | // set NUL terminating character in name buffer |
---|
1386 | *(name++) = 0; |
---|
1387 | |
---|
1388 | // return last an next |
---|
1389 | if( *ptr == 0 ) // last found character is NUL => last name in path |
---|
1390 | { |
---|
1391 | *last = true; |
---|
1392 | } |
---|
1393 | else // last found character is '/' => skip it |
---|
1394 | { |
---|
1395 | *last = false; |
---|
1396 | *next = ptr + 1; |
---|
1397 | } |
---|
1398 | |
---|
1399 | return 0; |
---|
1400 | |
---|
1401 | } // end vfs_get name_from_path() |
---|
1402 | |
---|
1403 | ////////////////////////////////////////////// |
---|
1404 | error_t vfs_lookup( xptr_t cwd_xp, |
---|
1405 | char * pathname, |
---|
1406 | uint32_t mode, |
---|
1407 | xptr_t * inode_xp ) |
---|
1408 | { |
---|
1409 | char name[CONFIG_VFS_MAX_NAME_LENGTH]; // one name in path |
---|
1410 | |
---|
1411 | xptr_t parent_xp; // extended pointer on parent inode |
---|
1412 | cxy_t parent_cxy; // cluster for parent inode |
---|
1413 | vfs_inode_t * parent_ptr; // local pointer on parent inode |
---|
1414 | xptr_t child_xp; // extended pointer on child inode |
---|
1415 | cxy_t child_cxy; // cluster for child inode |
---|
1416 | vfs_inode_t * child_ptr; // local pointer on child inode |
---|
1417 | vfs_fs_type_t fs_type; // File system type |
---|
1418 | vfs_ctx_t * ctx_ptr; // local pointer on FS context |
---|
1419 | char * current; // current pointer on path |
---|
1420 | char * next; // next value for current pointer |
---|
1421 | bool_t last; // true when the name is the last in path |
---|
1422 | bool_t found; // true when a child has been found |
---|
1423 | bool_t dir; // searched inode is a directory |
---|
1424 | bool_t create; // searched inode must be created if not found |
---|
1425 | bool_t excl; // searched inode must not exist |
---|
1426 | thread_t * this; // pointer on calling thread descriptor |
---|
1427 | process_t * process; // pointer on calling process descriptor |
---|
1428 | error_t error; |
---|
1429 | |
---|
1430 | this = CURRENT_THREAD; |
---|
1431 | process = this->process; |
---|
1432 | |
---|
1433 | #if DEBUG_VFS_LOOKUP |
---|
1434 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
1435 | if( DEBUG_VFS_LOOKUP < cycle ) |
---|
1436 | printk("\n[DBG] %s : thread %x in process %x enter for <%s> / cycle %d\n", |
---|
1437 | __FUNCTION__, this->trdid, process->pid, pathname, cycle ); |
---|
1438 | #endif |
---|
1439 | |
---|
1440 | // compute lookup flags |
---|
1441 | dir = mode & VFS_LOOKUP_DIR; |
---|
1442 | create = mode & VFS_LOOKUP_CREATE; |
---|
1443 | excl = mode & VFS_LOOKUP_EXCL; |
---|
1444 | |
---|
1445 | // get extended pointer on first inode to search |
---|
1446 | if( pathname[0] == '/' ) parent_xp = process->vfs_root_xp; |
---|
1447 | else parent_xp = cwd_xp; |
---|
1448 | |
---|
1449 | // initialise other loop variables |
---|
1450 | current = pathname; |
---|
1451 | next = NULL; |
---|
1452 | last = false; |
---|
1453 | child_xp = XPTR_NULL; |
---|
1454 | |
---|
1455 | // take lock on parent inode |
---|
1456 | vfs_inode_lock( parent_xp ); |
---|
1457 | |
---|
1458 | // sequencially loop on nodes in pathname |
---|
1459 | // load from device if one node in path not found in inode tree |
---|
1460 | // exit loop when last name found (i.e. last == true) |
---|
1461 | do |
---|
1462 | { |
---|
1463 | // get one name from path, and "last" flag |
---|
1464 | vfs_get_name_from_path( current , name , &next , &last ); |
---|
1465 | |
---|
1466 | #if (DEBUG_VFS_LOOKUP & 1) |
---|
1467 | if( DEBUG_VFS_LOOKUP < cycle ) |
---|
1468 | printk("\n[DBG] %s : look for <%s> / last = %d\n", |
---|
1469 | __FUNCTION__ , name , last ); |
---|
1470 | #endif |
---|
1471 | |
---|
1472 | // search a child dentry matching name in parent inode |
---|
1473 | found = vfs_get_child( parent_xp, |
---|
1474 | name, |
---|
1475 | &child_xp ); |
---|
1476 | |
---|
1477 | if (found == false ) // child not found in inode tree |
---|
1478 | { |
---|
1479 | |
---|
1480 | #if (DEBUG_VFS_LOOKUP & 1) |
---|
1481 | if( DEBUG_VFS_LOOKUP < cycle ) |
---|
1482 | printk("\n[DBG] %s : miss <%s> node => try to create it\n", |
---|
1483 | __FUNCTION__ , name ); |
---|
1484 | #endif |
---|
1485 | // if a child node is not found in the inode tree, |
---|
1486 | // we introduce a new (dentry/inode) in inode tree, |
---|
1487 | // and try to find it by scanning the parent directory mapper. |
---|
1488 | // . if it is found in parent mapper: |
---|
1489 | // - if the child is a directory, the child mapper is loaded from device |
---|
1490 | // - if the child is not a directory, the search is completed |
---|
1491 | // . if it is not found in the parent mapper: |
---|
1492 | // - if ( not last or not create ) an error is reported |
---|
1493 | // - if (last and create and dir) a new directory is created |
---|
1494 | // - if (last and create and not dir) a new file is created |
---|
1495 | |
---|
1496 | // release lock on parent inode |
---|
1497 | vfs_inode_unlock( parent_xp ); |
---|
1498 | |
---|
1499 | // get parent inode FS type |
---|
1500 | parent_cxy = GET_CXY( parent_xp ); |
---|
1501 | parent_ptr = GET_PTR( parent_xp ); |
---|
1502 | ctx_ptr = (vfs_ctx_t *)hal_remote_lpt( XPTR( parent_cxy,&parent_ptr->ctx ) ); |
---|
1503 | fs_type = hal_remote_lw( XPTR( parent_cxy , &ctx_ptr->type ) ); |
---|
1504 | |
---|
1505 | // select a cluster for missing inode |
---|
1506 | child_cxy = vfs_cluster_random_select(); |
---|
1507 | |
---|
1508 | // insert a new child dentry/inode in inode tree |
---|
1509 | error = vfs_add_child_in_parent( child_cxy, |
---|
1510 | 0, // type will be updated later |
---|
1511 | fs_type, |
---|
1512 | parent_xp, |
---|
1513 | name, |
---|
1514 | NULL, // fs_type_specific inode extend |
---|
1515 | &child_xp ); |
---|
1516 | if( error ) |
---|
1517 | { |
---|
1518 | printk("\n[ERROR] in %s : cannot create node %s for path <%s>\n", |
---|
1519 | __FUNCTION__ , name, pathname ); |
---|
1520 | return ENOMEM; |
---|
1521 | } |
---|
1522 | |
---|
1523 | // get child inode cluster and local pointer |
---|
1524 | child_cxy = GET_CXY( child_xp ); |
---|
1525 | child_ptr = GET_PTR( child_xp ); |
---|
1526 | |
---|
1527 | #if (DEBUG_VFS_LOOKUP & 1) |
---|
1528 | if( DEBUG_VFS_LOOKUP < cycle ) |
---|
1529 | printk("\n[DBG] %s : missing <%s> inode speculatively created / cxy %x / ptr %x\n", |
---|
1530 | __FUNCTION__ , name , child_cxy, child_ptr ); |
---|
1531 | #endif |
---|
1532 | // scan parent mapper to complete the missing inode |
---|
1533 | if( parent_cxy == local_cxy ) |
---|
1534 | { |
---|
1535 | error = vfs_inode_load( parent_ptr, |
---|
1536 | name, |
---|
1537 | child_xp ); |
---|
1538 | } |
---|
1539 | else |
---|
1540 | { |
---|
1541 | rpc_vfs_inode_load_client( parent_cxy, |
---|
1542 | parent_ptr, |
---|
1543 | name, |
---|
1544 | child_xp, |
---|
1545 | &error ); |
---|
1546 | } |
---|
1547 | |
---|
1548 | if ( error ) // child not found in parent mapper |
---|
1549 | { |
---|
1550 | if( last && create && dir ) // new directory => update inode type |
---|
1551 | { |
---|
1552 | hal_remote_sw( XPTR( child_cxy, &child_ptr->type ), INODE_TYPE_DIR ); |
---|
1553 | |
---|
1554 | #if (DEBUG_VFS_LOOKUP & 1) |
---|
1555 | if( DEBUG_VFS_LOOKUP < cycle ) |
---|
1556 | printk("\n[DBG] %s : created node <%s> in path %s / type DIR\n", |
---|
1557 | __FUNCTION__ , name, pathname ); |
---|
1558 | #endif |
---|
1559 | } |
---|
1560 | else if ( last && create ) // new file => update inode type |
---|
1561 | { |
---|
1562 | hal_remote_sw( XPTR( child_cxy, &child_ptr->type ), INODE_TYPE_FILE ); |
---|
1563 | |
---|
1564 | #if (DEBUG_VFS_LOOKUP & 1) |
---|
1565 | if( DEBUG_VFS_LOOKUP < cycle ) |
---|
1566 | printk("\n[DBG] %s : created node <%s> in path %s / type FILE\n", |
---|
1567 | __FUNCTION__ , name, pathname ); |
---|
1568 | #endif |
---|
1569 | } |
---|
1570 | else // not last or not create => remove created node |
---|
1571 | { |
---|
1572 | printk("\n[ERROR] in %s : <%s> node not found in parent for <%s>\n", |
---|
1573 | __FUNCTION__ , name , pathname ); |
---|
1574 | vfs_remove_child_from_parent( child_xp ); |
---|
1575 | return ENOENT; |
---|
1576 | } |
---|
1577 | } |
---|
1578 | else // child found in parent |
---|
1579 | { |
---|
1580 | // load child mapper from device if child is a directory (prefetch) |
---|
1581 | if( hal_remote_lw( XPTR( child_cxy , &child_ptr->type ) ) == INODE_TYPE_DIR ) |
---|
1582 | { |
---|
1583 | if( child_cxy == local_cxy ) |
---|
1584 | { |
---|
1585 | error = vfs_mapper_load_all( child_ptr ); |
---|
1586 | } |
---|
1587 | else |
---|
1588 | { |
---|
1589 | rpc_vfs_mapper_load_all_client( child_cxy, |
---|
1590 | child_ptr, |
---|
1591 | &error ); |
---|
1592 | } |
---|
1593 | if ( error ) |
---|
1594 | { |
---|
1595 | printk("\n[ERROR] in %s : cannot load <%s> from device\n", |
---|
1596 | __FUNCTION__ , name ); |
---|
1597 | vfs_remove_child_from_parent( child_xp ); |
---|
1598 | return EIO; |
---|
1599 | } |
---|
1600 | |
---|
1601 | #if (DEBUG_VFS_LOOKUP & 1) |
---|
1602 | if( DEBUG_VFS_LOOKUP < cycle ) |
---|
1603 | printk("\n[DBG] %s : load mapper from device for node <%s> in path %s\n", |
---|
1604 | __FUNCTION__ , name, pathname ); |
---|
1605 | #endif |
---|
1606 | } |
---|
1607 | } |
---|
1608 | |
---|
1609 | // take lock on parent inode |
---|
1610 | vfs_inode_lock( parent_xp ); |
---|
1611 | } |
---|
1612 | else // child found in inode tree |
---|
1613 | { |
---|
1614 | |
---|
1615 | #if (DEBUG_VFS_LOOKUP & 1) |
---|
1616 | if( DEBUG_VFS_LOOKUP < cycle ) |
---|
1617 | printk("\n[DBG] %s : found <%s> / inode %x in cluster %x\n", |
---|
1618 | __FUNCTION__ , name , GET_PTR(child_xp) , GET_CXY(child_xp) ); |
---|
1619 | #endif |
---|
1620 | child_ptr = GET_PTR( child_xp ); |
---|
1621 | child_cxy = GET_CXY( child_xp ); |
---|
1622 | parent_cxy = GET_CXY( parent_xp ); |
---|
1623 | parent_ptr = GET_PTR( parent_xp ); |
---|
1624 | |
---|
1625 | if( last && (mode & VFS_LOOKUP_CREATE) && (mode & VFS_LOOKUP_EXCL) ) |
---|
1626 | { |
---|
1627 | printk("\n[ERROR] in %s : node already exist <%s>\n", __FUNCTION__, name ); |
---|
1628 | return EINVAL; |
---|
1629 | } |
---|
1630 | } |
---|
1631 | |
---|
1632 | // TODO check access rights here [AG] |
---|
1633 | // error = vfs_access_denied( child_xp, |
---|
1634 | // client_uid, |
---|
1635 | // client_gid ); |
---|
1636 | // if( error ) |
---|
1637 | // { |
---|
1638 | // printk("\n[ERROR] in %s : thread %x / permission denied for %s\n", |
---|
1639 | // __FUNCTION__ , this , name ); |
---|
1640 | // return EACCES; |
---|
1641 | // } |
---|
1642 | |
---|
1643 | // take lock on child inode and release lock on parent |
---|
1644 | vfs_inode_lock( child_xp ); |
---|
1645 | vfs_inode_unlock( parent_xp ); |
---|
1646 | |
---|
1647 | // update loop variables |
---|
1648 | parent_xp = child_xp; |
---|
1649 | current = next; |
---|
1650 | } |
---|
1651 | while( last == false ); |
---|
1652 | |
---|
1653 | // release lock |
---|
1654 | vfs_inode_unlock( parent_xp ); |
---|
1655 | |
---|
1656 | #if DEBUG_VFS_LOOKUP |
---|
1657 | cycle = (uint32_t)hal_get_cycles(); |
---|
1658 | if( DEBUG_VFS_LOOKUP < cycle ) |
---|
1659 | printk("\n[DBG] %s : thread %x in process %x exit for <%s>\n" |
---|
1660 | " parent %x in cluster %x / child %x in cluster %x / cycle %d\n", |
---|
1661 | __FUNCTION__ , this->trdid, process->pid, pathname, |
---|
1662 | parent_ptr, parent_cxy, child_ptr, child_cxy, cycle ); |
---|
1663 | #endif |
---|
1664 | |
---|
1665 | // return searched pointer |
---|
1666 | if( mode & VFS_LOOKUP_PARENT ) *inode_xp = parent_xp; |
---|
1667 | else *inode_xp = child_xp; |
---|
1668 | |
---|
1669 | return 0; |
---|
1670 | |
---|
1671 | } // end vfs_lookup() |
---|
1672 | |
---|
1673 | //////////////////////////////////////////// |
---|
1674 | error_t vfs_get_path( xptr_t searched_xp, |
---|
1675 | char * buffer, |
---|
1676 | uint32_t max_size ) |
---|
1677 | { |
---|
1678 | xptr_t dentry_xp; // extended pointer on current dentry |
---|
1679 | char * name; // local pointer on current dentry name |
---|
1680 | uint32_t length; // length of current dentry name |
---|
1681 | uint32_t count; // number of characters written in buffer |
---|
1682 | uint32_t index; // slot index in buffer |
---|
1683 | xptr_t inode_xp; // extended pointer on |
---|
1684 | |
---|
1685 | // implementation note: |
---|
1686 | // we use two variables "index" and "count" because the buffer |
---|
1687 | // is written in decreasing index order (from leaf to root) |
---|
1688 | // TODO : handle conflict with a concurrent rename [AG] |
---|
1689 | // FIXME : handle synchro in the loop [AG] |
---|
1690 | |
---|
1691 | // set the NUL character in buffer / initialise buffer index and count |
---|
1692 | buffer[max_size - 1] = 0; |
---|
1693 | count = 1; |
---|
1694 | index = max_size - 2; |
---|
1695 | |
---|
1696 | // initialize current inode |
---|
1697 | inode_xp = searched_xp; |
---|
1698 | |
---|
1699 | // exit when root inode found (i.e. dentry_xp == XPTR_NULL) |
---|
1700 | do |
---|
1701 | { |
---|
1702 | // get inode cluster and local pointer |
---|
1703 | cxy_t inode_cxy = GET_CXY( inode_xp ); |
---|
1704 | vfs_inode_t * inode_ptr = GET_PTR( inode_xp ); |
---|
1705 | |
---|
1706 | // get extended pointer on parent dentry |
---|
1707 | dentry_xp = (xptr_t)hal_remote_lwd( XPTR( inode_cxy , inode_ptr->parent_xp ) ); |
---|
1708 | |
---|
1709 | // get dentry cluster and local pointer |
---|
1710 | cxy_t dentry_cxy = GET_CXY( dentry_xp ); |
---|
1711 | vfs_dentry_t * dentry_ptr = GET_PTR( dentry_xp ); |
---|
1712 | |
---|
1713 | // get dentry name length and pointer |
---|
1714 | length = hal_remote_lw( XPTR( dentry_cxy , &dentry_ptr->length ) ); |
---|
1715 | name = (char *)hal_remote_lpt( XPTR( dentry_cxy , &dentry_ptr->name ) ); |
---|
1716 | |
---|
1717 | // update index and count |
---|
1718 | index -= (length + 1); |
---|
1719 | count += (length + 1); |
---|
1720 | |
---|
1721 | // check buffer overflow |
---|
1722 | if( count >= max_size ) |
---|
1723 | { |
---|
1724 | printk("\n[ERROR] in %s : kernel buffer too small\n", __FUNCTION__ ); |
---|
1725 | return EINVAL; |
---|
1726 | } |
---|
1727 | |
---|
1728 | // update pathname |
---|
1729 | hal_remote_memcpy( XPTR( local_cxy , &buffer[index + 1] ) , |
---|
1730 | XPTR( dentry_cxy , name ) , length ); |
---|
1731 | buffer[index] = '/'; |
---|
1732 | |
---|
1733 | // get extended pointer on next inode |
---|
1734 | inode_xp = (xptr_t)hal_remote_lwd( XPTR( dentry_cxy , dentry_ptr->parent ) ); |
---|
1735 | } |
---|
1736 | while( (dentry_xp != XPTR_NULL) ); |
---|
1737 | |
---|
1738 | return 0; |
---|
1739 | |
---|
1740 | } // end vfs_get_path() |
---|
1741 | |
---|
1742 | |
---|
1743 | ////////////////////////////////////////////////////////////// |
---|
1744 | error_t vfs_add_child_in_parent( cxy_t child_cxy, |
---|
1745 | vfs_inode_type_t inode_type, |
---|
1746 | vfs_fs_type_t fs_type, |
---|
1747 | xptr_t parent_xp, |
---|
1748 | char * name, |
---|
1749 | void * extend, |
---|
1750 | xptr_t * child_xp ) |
---|
1751 | { |
---|
1752 | error_t error; |
---|
1753 | xptr_t dentry_xp; // extended pointer on created dentry |
---|
1754 | xptr_t inode_xp; // extended pointer on created inode |
---|
1755 | cxy_t parent_cxy; // parent inode cluster identifier |
---|
1756 | vfs_inode_t * parent_ptr; // parent inode local pointer |
---|
1757 | |
---|
1758 | // get parent inode cluster and local pointer |
---|
1759 | parent_cxy = GET_CXY( parent_xp ); |
---|
1760 | parent_ptr = GET_PTR( parent_xp ); |
---|
1761 | |
---|
1762 | #if DEBUG_VFS_ADD_CHILD |
---|
1763 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
1764 | if( DEBUG_VFS_ADD_CHILD < cycle ) |
---|
1765 | printk("\n[DBG] %s : thread %x enter for <%s> / child_cxy = %x / parent_cxy = %x / cycle %d\n", |
---|
1766 | __FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, name, |
---|
1767 | child_cxy, parent_cxy, (uint32_t)hal_get_cycles() ); |
---|
1768 | #endif |
---|
1769 | |
---|
1770 | // 1. create dentry |
---|
1771 | if( parent_cxy == local_cxy ) // parent cluster is the local cluster |
---|
1772 | { |
---|
1773 | error = vfs_dentry_create( fs_type, |
---|
1774 | name, |
---|
1775 | parent_ptr, |
---|
1776 | &dentry_xp ); |
---|
1777 | |
---|
1778 | #if (DEBUG_VFS_ADD_CHILD & 1) |
---|
1779 | if( (DEBUG_VFS_ADD_CHILD < cycle) && (error == 0) ) |
---|
1780 | printk("\n[DBG] %s : dentry <%s> created in cluster %x\n", __FUNCTION__, name, local_cxy ); |
---|
1781 | #endif |
---|
1782 | |
---|
1783 | } |
---|
1784 | else // parent cluster is remote |
---|
1785 | { |
---|
1786 | rpc_vfs_dentry_create_client( parent_cxy, |
---|
1787 | fs_type, |
---|
1788 | name, |
---|
1789 | parent_ptr, |
---|
1790 | &dentry_xp, |
---|
1791 | &error ); |
---|
1792 | |
---|
1793 | #if (DEBUG_VFS_ADD_CHILD & 1) |
---|
1794 | if( (DEBUG_VFS_ADD_CHILD < cycle) && (error == 0) ) |
---|
1795 | printk("\n[DBG] %s : dentry <%s> created in cluster %x\n", __FUNCTION__, name, parent_cxy ); |
---|
1796 | #endif |
---|
1797 | |
---|
1798 | } |
---|
1799 | |
---|
1800 | if( error ) |
---|
1801 | { |
---|
1802 | printk("\n[ERROR] in %s : cannot create dentry <%s> in cluster %x\n", |
---|
1803 | __FUNCTION__ , name , parent_cxy ); |
---|
1804 | return ENOMEM; |
---|
1805 | } |
---|
1806 | |
---|
1807 | // 2. create child inode TODO : define attr / mode / uid / gid |
---|
1808 | uint32_t attr = 0; |
---|
1809 | uint32_t mode = 0; |
---|
1810 | uint32_t uid = 0; |
---|
1811 | uint32_t gid = 0; |
---|
1812 | |
---|
1813 | if( child_cxy == local_cxy ) // child cluster is the local cluster |
---|
1814 | { |
---|
1815 | error = vfs_inode_create( dentry_xp, |
---|
1816 | fs_type, |
---|
1817 | inode_type, |
---|
1818 | extend, |
---|
1819 | attr, |
---|
1820 | mode, |
---|
1821 | uid, |
---|
1822 | gid, |
---|
1823 | &inode_xp ); |
---|
1824 | |
---|
1825 | #if (DEBUG_VFS_ADD_CHILD & 1) |
---|
1826 | if( DEBUG_VFS_ADD_CHILD < cycle ) |
---|
1827 | printk("\n[DBG] %s : inode <%x> created in cluster %x\n", |
---|
1828 | __FUNCTION__ , GET_PTR(inode_xp) , local_cxy ); |
---|
1829 | #endif |
---|
1830 | |
---|
1831 | } |
---|
1832 | else // child cluster is remote |
---|
1833 | { |
---|
1834 | rpc_vfs_inode_create_client( child_cxy, |
---|
1835 | dentry_xp, |
---|
1836 | fs_type, |
---|
1837 | inode_type, |
---|
1838 | extend, |
---|
1839 | attr, |
---|
1840 | mode, |
---|
1841 | uid, |
---|
1842 | gid, |
---|
1843 | &inode_xp, |
---|
1844 | &error ); |
---|
1845 | |
---|
1846 | #if (DEBUG_VFS_ADD_CHILD & 1) |
---|
1847 | if( DEBUG_VFS_ADD_CHILD < cycle ) |
---|
1848 | printk("\n[DBG] %s : inode <%s> created in cluster %x\n", |
---|
1849 | __FUNCTION__ , GET_PTR(inode_xp) , child_cxy ); |
---|
1850 | #endif |
---|
1851 | |
---|
1852 | } |
---|
1853 | |
---|
1854 | if( error ) |
---|
1855 | { |
---|
1856 | printk("\n[ERROR] in %s : cannot create inode in cluster %x\n", |
---|
1857 | __FUNCTION__ , child_cxy ); |
---|
1858 | |
---|
1859 | vfs_dentry_t * dentry = GET_PTR( dentry_xp ); |
---|
1860 | if( parent_cxy == local_cxy ) vfs_dentry_destroy( dentry ); |
---|
1861 | else rpc_vfs_dentry_destroy_client( parent_cxy , dentry , &error ); |
---|
1862 | return ENOMEM; |
---|
1863 | } |
---|
1864 | |
---|
1865 | // 3. update extended pointer on inode in dentry |
---|
1866 | cxy_t dentry_cxy = GET_CXY( dentry_xp ); |
---|
1867 | vfs_dentry_t * dentry_ptr = GET_PTR( dentry_xp ); |
---|
1868 | hal_remote_swd( XPTR( dentry_cxy , &dentry_ptr->child_xp ) , inode_xp ); |
---|
1869 | |
---|
1870 | #if DEBUG_VFS_ADD_CHILD |
---|
1871 | cycle = (uint32_t)hal_get_cycles(); |
---|
1872 | if( DEBUG_VFS_ADD_CHILD < cycle ) |
---|
1873 | printk("\n[DBG] %s : thread %x in process %x exit for <%s>\n", |
---|
1874 | __FUNCTION__, CURRENT_THREAD, CURRENT_THREAD->process->pid, name ); |
---|
1875 | #endif |
---|
1876 | |
---|
1877 | // success : return extended pointer on child inode |
---|
1878 | *child_xp = inode_xp; |
---|
1879 | return 0; |
---|
1880 | |
---|
1881 | // FIXME update the refcount fields in both inode and dentry |
---|
1882 | |
---|
1883 | } // end vfs_add_child_in_parent() |
---|
1884 | |
---|
1885 | /////////////////////////////////////////////////////// |
---|
1886 | error_t vfs_remove_child_from_parent( xptr_t inode_xp ) |
---|
1887 | { |
---|
1888 | cxy_t inode_cxy; |
---|
1889 | vfs_inode_t * inode_ptr; |
---|
1890 | xptr_t dentry_xp; |
---|
1891 | cxy_t dentry_cxy; |
---|
1892 | vfs_dentry_t * dentry_ptr; |
---|
1893 | error_t error; |
---|
1894 | |
---|
1895 | // get inode cluster and local pointer |
---|
1896 | inode_cxy = GET_CXY( inode_xp ); |
---|
1897 | inode_ptr = GET_PTR( inode_xp ); |
---|
1898 | |
---|
1899 | // get cluster and pointers of associated dentry |
---|
1900 | dentry_xp = hal_remote_lwd( XPTR( inode_cxy , &inode_ptr->parent_xp ) ); |
---|
1901 | dentry_cxy = GET_CXY( dentry_xp ); |
---|
1902 | dentry_ptr = GET_PTR( dentry_xp ); |
---|
1903 | |
---|
1904 | // FIXME update the refcount fields in both inode and dentry |
---|
1905 | |
---|
1906 | // delete dentry |
---|
1907 | if( dentry_cxy == local_cxy ) |
---|
1908 | { |
---|
1909 | error = vfs_dentry_destroy( dentry_ptr ); |
---|
1910 | } |
---|
1911 | else |
---|
1912 | { |
---|
1913 | rpc_vfs_dentry_destroy_client( dentry_cxy, |
---|
1914 | dentry_ptr, |
---|
1915 | &error ); |
---|
1916 | } |
---|
1917 | if( error ) return EINVAL; |
---|
1918 | |
---|
1919 | // delete inode |
---|
1920 | if( inode_cxy == local_cxy ) |
---|
1921 | { |
---|
1922 | vfs_inode_destroy( inode_ptr ); |
---|
1923 | } |
---|
1924 | else |
---|
1925 | { |
---|
1926 | rpc_vfs_inode_destroy_client( inode_cxy, |
---|
1927 | inode_ptr, |
---|
1928 | &error ); |
---|
1929 | } |
---|
1930 | if( error ) return EINVAL; |
---|
1931 | |
---|
1932 | return 0; |
---|
1933 | |
---|
1934 | } // end vfs_remove_child_from_parent() |
---|
1935 | |
---|
1936 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1937 | // Mapper related functions |
---|
1938 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1939 | |
---|
1940 | //////////////////////////////////////////// |
---|
1941 | error_t vfs_mapper_move_page( page_t * page, |
---|
1942 | bool_t to_mapper ) |
---|
1943 | { |
---|
1944 | error_t error = 0; |
---|
1945 | |
---|
1946 | assert( (page != NULL) , __FUNCTION__ , "page pointer is NULL\n" ); |
---|
1947 | |
---|
1948 | mapper_t * mapper = page->mapper; |
---|
1949 | |
---|
1950 | assert( (mapper != NULL) , __FUNCTION__ , "no mapper for page\n" ); |
---|
1951 | |
---|
1952 | #if DEBUG_VFS_MAPPER_MOVE |
---|
1953 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
1954 | if( DEBUG_VFS_MAPPER_MOVE < cycle ) |
---|
1955 | printk("\n[DBG] %s : thread %x enter for page %d / mapper %x / inode %x / cycle %d\n", |
---|
1956 | __FUNCTION__, CURRENT_THREAD, page->index, mapper, mapper->inode, cycle ); |
---|
1957 | #endif |
---|
1958 | |
---|
1959 | // get FS type |
---|
1960 | vfs_fs_type_t fs_type = mapper->type; |
---|
1961 | |
---|
1962 | // call relevant FS function |
---|
1963 | if( fs_type == FS_TYPE_FATFS ) |
---|
1964 | { |
---|
1965 | rwlock_wr_lock( &mapper->lock ); |
---|
1966 | error = fatfs_mapper_move_page( page , to_mapper ); |
---|
1967 | rwlock_wr_unlock( &mapper->lock ); |
---|
1968 | } |
---|
1969 | else if( fs_type == FS_TYPE_RAMFS ) |
---|
1970 | { |
---|
1971 | assert( false , __FUNCTION__ , "should not be called for RAMFS\n" ); |
---|
1972 | } |
---|
1973 | else if( fs_type == FS_TYPE_DEVFS ) |
---|
1974 | { |
---|
1975 | assert( false , __FUNCTION__ , "should not be called for DEVFS\n" ); |
---|
1976 | } |
---|
1977 | else |
---|
1978 | { |
---|
1979 | assert( false , __FUNCTION__ , "undefined file system type\n" ); |
---|
1980 | } |
---|
1981 | |
---|
1982 | #if DEBUG_VFS_MAPPER_MOVE |
---|
1983 | cycle = (uint32_t)hal_get_cycles(); |
---|
1984 | if( DEBUG_VFS_MAPPER_MOVE < cycle ) |
---|
1985 | printk("\n[DBG] %s : thread %x exit for page %d / mapper %x / inode %x / cycle %d\n", |
---|
1986 | __FUNCTION__, CURRENT_THREAD, page->index, mapper, mapper->inode, cycle ); |
---|
1987 | #endif |
---|
1988 | |
---|
1989 | return error; |
---|
1990 | |
---|
1991 | } // end vfs_move_page() |
---|
1992 | |
---|
1993 | ////////////////////////////////////////////////// |
---|
1994 | error_t vfs_mapper_load_all( vfs_inode_t * inode ) |
---|
1995 | { |
---|
1996 | assert( (inode != NULL) , __FUNCTION__ , "inode pointer is NULL\n" ); |
---|
1997 | |
---|
1998 | uint32_t index; |
---|
1999 | page_t * page; |
---|
2000 | |
---|
2001 | mapper_t * mapper = inode->mapper; |
---|
2002 | uint32_t size = inode->size; |
---|
2003 | |
---|
2004 | assert( (mapper != NULL) , __FUNCTION__ , "mapper pointer is NULL\n" ); |
---|
2005 | |
---|
2006 | #if DEBUG_VFS_MAPPER_LOAD |
---|
2007 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
2008 | if( DEBUG_VFS_MAPPER_MOVE < cycle ) |
---|
2009 | printk("\n[DBG] %s : thread %x enter for inode %x in cluster %x / cycle %d\n", |
---|
2010 | __FUNCTION__, CURRENT_THREAD, inode, local_cxy, cycle ); |
---|
2011 | #endif |
---|
2012 | |
---|
2013 | // compute number of pages |
---|
2014 | uint32_t npages = size >> CONFIG_PPM_PAGE_SHIFT; |
---|
2015 | if( (size & CONFIG_PPM_PAGE_MASK) || (size == 0) ) npages++; |
---|
2016 | |
---|
2017 | // loop on pages |
---|
2018 | for( index = 0 ; index < npages ; index ++ ) |
---|
2019 | { |
---|
2020 | // this function allocates the missing page in mapper, |
---|
2021 | // and call the vfs_mapper_move_page() to load the page from device |
---|
2022 | page = mapper_get_page( mapper , index ); |
---|
2023 | |
---|
2024 | if( page == NULL ) return EIO; |
---|
2025 | } |
---|
2026 | |
---|
2027 | #if DEBUG_VFS_MAPPER_LOAD |
---|
2028 | cycle = (uint32_t)hal_get_cycles(); |
---|
2029 | if( DEBUG_VFS_MAPPER_MOVE < cycle ) |
---|
2030 | printk("\n[DBG] %s : thread %x exit for inode %x in cluster %x / cycle %d\n", |
---|
2031 | __FUNCTION__, CURRENT_THREAD, inode, local_cxy, cycle ); |
---|
2032 | #endif |
---|
2033 | |
---|
2034 | return 0; |
---|
2035 | |
---|
2036 | } // end vfs_mapper_load_all() |
---|
2037 | |
---|