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Rev | Author | Line No. | Line |
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2642 | jermar | 1 | /* |
4409 | jermar | 2 | * Copyright (c) 2009 Jakub Jermar |
2642 | jermar | 3 | * All rights reserved. |
4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
29 | /** @addtogroup libfs |
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30 | * @{ |
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31 | */ |
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32 | /** |
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33 | * @file |
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34 | * Glue code which is commonod to all FS implementations. |
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35 | */ |
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36 | |||
37 | #include "libfs.h" |
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2643 | jermar | 38 | #include "../../srv/vfs/vfs.h" |
39 | #include <errno.h> |
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40 | #include <async.h> |
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41 | #include <ipc/ipc.h> |
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42 | #include <as.h> |
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2747 | jermar | 43 | #include <assert.h> |
44 | #include <dirent.h> |
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2642 | jermar | 45 | |
2643 | jermar | 46 | /** Register file system server. |
47 | * |
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48 | * This function abstracts away the tedious registration protocol from |
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49 | * file system implementations and lets them to reuse this registration glue |
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50 | * code. |
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51 | * |
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52 | * @param vfs_phone Open phone for communication with VFS. |
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53 | * @param reg File system registration structure. It will be |
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54 | * initialized by this function. |
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55 | * @param info VFS info structure supplied by the file system |
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56 | * implementation. |
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57 | * @param conn Connection fibril for handling all calls originating in |
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58 | * VFS. |
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59 | * |
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60 | * @return EOK on success or a non-zero error code on errror. |
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61 | */ |
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62 | int fs_register(int vfs_phone, fs_reg_t *reg, vfs_info_t *info, |
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63 | async_client_conn_t conn) |
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64 | { |
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65 | /* |
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66 | * Tell VFS that we are here and want to get registered. |
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67 | * We use the async framework because VFS will answer the request |
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68 | * out-of-order, when it knows that the operation succeeded or failed. |
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69 | */ |
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70 | ipc_call_t answer; |
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71 | aid_t req = async_send_0(vfs_phone, VFS_REGISTER, &answer); |
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72 | |||
73 | /* |
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74 | * Send our VFS info structure to VFS. |
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75 | */ |
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2678 | jermar | 76 | int rc = ipc_data_write_start(vfs_phone, info, sizeof(*info)); |
2643 | jermar | 77 | if (rc != EOK) { |
78 | async_wait_for(req, NULL); |
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79 | return rc; |
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80 | } |
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81 | |||
82 | /* |
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83 | * Ask VFS for callback connection. |
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84 | */ |
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85 | ipc_connect_to_me(vfs_phone, 0, 0, 0, ®->vfs_phonehash); |
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86 | |||
87 | /* |
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88 | * Allocate piece of address space for PLB. |
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89 | */ |
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90 | reg->plb_ro = as_get_mappable_page(PLB_SIZE); |
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91 | if (!reg->plb_ro) { |
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92 | async_wait_for(req, NULL); |
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93 | return ENOMEM; |
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94 | } |
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95 | |||
96 | /* |
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97 | * Request sharing the Path Lookup Buffer with VFS. |
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98 | */ |
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2678 | jermar | 99 | rc = ipc_share_in_start_0_0(vfs_phone, reg->plb_ro, PLB_SIZE); |
2643 | jermar | 100 | if (rc) { |
101 | async_wait_for(req, NULL); |
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102 | return rc; |
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103 | } |
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104 | |||
105 | /* |
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106 | * Pick up the answer for the request to the VFS_REQUEST call. |
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107 | */ |
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108 | async_wait_for(req, NULL); |
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109 | reg->fs_handle = (int) IPC_GET_ARG1(answer); |
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110 | |||
111 | /* |
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112 | * Create a connection fibril to handle the callback connection. |
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113 | */ |
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114 | async_new_connection(reg->vfs_phonehash, 0, NULL, conn); |
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115 | |||
116 | /* |
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117 | * Tell the async framework that other connections are to be handled by |
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118 | * the same connection fibril as well. |
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119 | */ |
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120 | async_set_client_connection(conn); |
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121 | |||
122 | return IPC_GET_RETVAL(answer); |
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123 | } |
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124 | |||
4409 | jermar | 125 | void fs_node_initialize(fs_node_t *fn) |
126 | { |
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127 | memset(fn, 0, sizeof(fs_node_t)); |
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128 | } |
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129 | |||
130 | void libfs_mount(libfs_ops_t *ops, ipc_callid_t rid, ipc_call_t *request) |
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131 | { |
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132 | dev_handle_t mp_dev_handle = (dev_handle_t)IPC_GET_ARG1(*request); |
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133 | fs_index_t mp_fs_index = (fs_index_t)IPC_GET_ARG2(*request); |
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134 | fs_handle_t mr_fs_handle = (fs_handle_t)IPC_GET_ARG3(*request); |
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135 | dev_handle_t mr_dev_handle = (dev_handle_t)IPC_GET_ARG4(*request); |
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136 | int res; |
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137 | ipcarg_t rc; |
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138 | |||
139 | ipc_call_t call; |
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140 | ipc_callid_t callid; |
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141 | |||
142 | /* accept the phone */ |
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143 | callid = async_get_call(&call); |
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144 | int mountee_phone = (int)IPC_GET_ARG1(call); |
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145 | if ((IPC_GET_METHOD(call) != IPC_M_CONNECTION_CLONE) || |
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146 | mountee_phone < 0) { |
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147 | ipc_answer_0(callid, EINVAL); |
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148 | ipc_answer_0(rid, EINVAL); |
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149 | return; |
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150 | } |
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151 | ipc_answer_0(callid, EOK); /* acknowledge the mountee_phone */ |
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152 | |||
153 | res = ipc_data_write_receive(&callid, NULL); |
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154 | if (!res) { |
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155 | ipc_hangup(mountee_phone); |
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156 | ipc_answer_0(callid, EINVAL); |
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157 | ipc_answer_0(rid, EINVAL); |
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158 | return; |
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159 | } |
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160 | |||
161 | fs_node_t *fn = ops->node_get(mp_dev_handle, mp_fs_index); |
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162 | if (!fn) { |
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163 | ipc_hangup(mountee_phone); |
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164 | ipc_answer_0(callid, ENOENT); |
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165 | ipc_answer_0(rid, ENOENT); |
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166 | return; |
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167 | } |
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168 | |||
169 | if (fn->mp_data.mp_active) { |
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170 | ipc_hangup(mountee_phone); |
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171 | ops->node_put(fn); |
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172 | ipc_answer_0(callid, EBUSY); |
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173 | ipc_answer_0(rid, EBUSY); |
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174 | return; |
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175 | } |
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176 | |||
177 | rc = async_req_0_0(mountee_phone, IPC_M_CONNECT_ME); |
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178 | if (rc != 0) { |
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179 | ipc_hangup(mountee_phone); |
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180 | ops->node_put(fn); |
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181 | ipc_answer_0(callid, rc); |
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182 | ipc_answer_0(rid, rc); |
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183 | return; |
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184 | } |
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185 | |||
186 | ipc_call_t answer; |
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187 | aid_t msg = async_send_1(mountee_phone, VFS_MOUNTED, mr_dev_handle, |
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188 | &answer); |
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189 | ipc_forward_fast(callid, mountee_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); |
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190 | async_wait_for(msg, &rc); |
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191 | |||
192 | if (rc == EOK) { |
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193 | fn->mp_data.mp_active = true; |
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194 | fn->mp_data.fs_handle = mr_fs_handle; |
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195 | fn->mp_data.dev_handle = mr_dev_handle; |
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196 | fn->mp_data.phone = mountee_phone; |
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197 | } |
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198 | /* |
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199 | * Do not release the FS node so that it stays in memory. |
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200 | */ |
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201 | ipc_answer_0(rid, rc); |
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202 | } |
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203 | |||
2750 | jermar | 204 | /** Lookup VFS triplet by name in the file system name space. |
205 | * |
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2751 | jermar | 206 | * The path passed in the PLB must be in the canonical file system path format |
207 | * as returned by the canonify() function. |
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208 | * |
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2750 | jermar | 209 | * @param ops libfs operations structure with function pointers to |
210 | * file system implementation |
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211 | * @param fs_handle File system handle of the file system where to perform |
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212 | * the lookup. |
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213 | * @param rid Request ID of the VFS_LOOKUP request. |
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214 | * @param request VFS_LOOKUP request data itself. |
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215 | */ |
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2770 | jermar | 216 | void libfs_lookup(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid, |
2747 | jermar | 217 | ipc_call_t *request) |
218 | { |
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4409 | jermar | 219 | unsigned first = IPC_GET_ARG1(*request); |
2747 | jermar | 220 | unsigned last = IPC_GET_ARG2(*request); |
4409 | jermar | 221 | unsigned next = first; |
2770 | jermar | 222 | dev_handle_t dev_handle = IPC_GET_ARG3(*request); |
2747 | jermar | 223 | int lflag = IPC_GET_ARG4(*request); |
2770 | jermar | 224 | fs_index_t index = IPC_GET_ARG5(*request); /* when L_LINK specified */ |
2847 | jermar | 225 | char component[NAME_MAX + 1]; |
226 | int len; |
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2747 | jermar | 227 | |
228 | if (last < next) |
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229 | last += PLB_SIZE; |
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230 | |||
4357 | jermar | 231 | fs_node_t *par = NULL; |
232 | fs_node_t *cur = ops->root_get(dev_handle); |
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233 | fs_node_t *tmp = NULL; |
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2747 | jermar | 234 | |
4409 | jermar | 235 | if (cur->mp_data.mp_active) { |
236 | ipc_forward_slow(rid, cur->mp_data.phone, VFS_LOOKUP, |
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237 | next, last, cur->mp_data.dev_handle, lflag, index, |
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238 | IPC_FF_ROUTE_FROM_ME); |
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239 | ops->node_put(cur); |
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240 | return; |
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241 | } |
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242 | |||
2747 | jermar | 243 | if (ops->plb_get_char(next) == '/') |
244 | next++; /* eat slash */ |
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245 | |||
3002 | jermar | 246 | while (next <= last && ops->has_children(cur)) { |
2747 | jermar | 247 | /* collect the component */ |
2847 | jermar | 248 | len = 0; |
3003 | jermar | 249 | while ((next <= last) && (ops->plb_get_char(next) != '/')) { |
2747 | jermar | 250 | if (len + 1 == NAME_MAX) { |
3048 | decky | 251 | /* component length overflow */ |
2747 | jermar | 252 | ipc_answer_0(rid, ENAMETOOLONG); |
2852 | jermar | 253 | goto out; |
2747 | jermar | 254 | } |
255 | component[len++] = ops->plb_get_char(next); |
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256 | next++; /* process next character */ |
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257 | } |
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258 | |||
259 | assert(len); |
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260 | component[len] = '\0'; |
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261 | next++; /* eat slash */ |
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262 | |||
263 | /* match the component */ |
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2791 | jermar | 264 | tmp = ops->match(cur, component); |
4409 | jermar | 265 | if (tmp && tmp->mp_data.mp_active) { |
266 | if (next > last) |
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267 | next = last = first; |
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268 | else |
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269 | next--; |
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270 | |||
271 | ipc_forward_slow(rid, tmp->mp_data.phone, VFS_LOOKUP, |
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272 | next, last, tmp->mp_data.dev_handle, lflag, index, |
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273 | IPC_FF_ROUTE_FROM_ME); |
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274 | ops->node_put(cur); |
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275 | ops->node_put(tmp); |
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276 | if (par) |
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277 | ops->node_put(par); |
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278 | return; |
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279 | } |
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2747 | jermar | 280 | |
281 | /* handle miss: match amongst siblings */ |
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282 | if (!tmp) { |
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2763 | jermar | 283 | if (next <= last) { |
284 | /* there are unprocessed components */ |
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285 | ipc_answer_0(rid, ENOENT); |
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2852 | jermar | 286 | goto out; |
2763 | jermar | 287 | } |
288 | /* miss in the last component */ |
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289 | if (lflag & (L_CREATE | L_LINK)) { |
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290 | /* request to create a new link */ |
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2747 | jermar | 291 | if (!ops->is_directory(cur)) { |
292 | ipc_answer_0(rid, ENOTDIR); |
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2852 | jermar | 293 | goto out; |
2763 | jermar | 294 | } |
4357 | jermar | 295 | fs_node_t *fn; |
2763 | jermar | 296 | if (lflag & L_CREATE) |
4357 | jermar | 297 | fn = ops->create(dev_handle, lflag); |
2763 | jermar | 298 | else |
4357 | jermar | 299 | fn = ops->node_get(dev_handle, |
2863 | jermar | 300 | index); |
4357 | jermar | 301 | if (fn) { |
3625 | jermar | 302 | int rc; |
303 | |||
4357 | jermar | 304 | rc = ops->link(cur, fn, component); |
3625 | jermar | 305 | if (rc != EOK) { |
3002 | jermar | 306 | if (lflag & L_CREATE) { |
4357 | jermar | 307 | (void)ops->destroy(fn); |
3002 | jermar | 308 | } |
3625 | jermar | 309 | ipc_answer_0(rid, rc); |
2747 | jermar | 310 | } else { |
311 | ipc_answer_5(rid, EOK, |
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312 | fs_handle, dev_handle, |
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4357 | jermar | 313 | ops->index_get(fn), |
314 | ops->size_get(fn), |
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315 | ops->lnkcnt_get(fn)); |
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316 | ops->node_put(fn); |
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2747 | jermar | 317 | } |
318 | } else { |
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319 | ipc_answer_0(rid, ENOSPC); |
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320 | } |
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2852 | jermar | 321 | goto out; |
2763 | jermar | 322 | } |
2747 | jermar | 323 | ipc_answer_0(rid, ENOENT); |
2852 | jermar | 324 | goto out; |
2747 | jermar | 325 | } |
326 | |||
2852 | jermar | 327 | if (par) |
328 | ops->node_put(par); |
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329 | |||
2747 | jermar | 330 | /* descend one level */ |
2758 | jermar | 331 | par = cur; |
2747 | jermar | 332 | cur = tmp; |
2852 | jermar | 333 | tmp = NULL; |
2747 | jermar | 334 | } |
335 | |||
336 | /* handle miss: excessive components */ |
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3002 | jermar | 337 | if (next <= last && !ops->has_children(cur)) { |
2763 | jermar | 338 | if (lflag & (L_CREATE | L_LINK)) { |
2747 | jermar | 339 | if (!ops->is_directory(cur)) { |
340 | ipc_answer_0(rid, ENOTDIR); |
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2852 | jermar | 341 | goto out; |
2747 | jermar | 342 | } |
343 | |||
344 | /* collect next component */ |
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2847 | jermar | 345 | len = 0; |
2747 | jermar | 346 | while (next <= last) { |
347 | if (ops->plb_get_char(next) == '/') { |
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348 | /* more than one component */ |
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349 | ipc_answer_0(rid, ENOENT); |
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2852 | jermar | 350 | goto out; |
2747 | jermar | 351 | } |
352 | if (len + 1 == NAME_MAX) { |
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353 | /* component length overflow */ |
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354 | ipc_answer_0(rid, ENAMETOOLONG); |
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2852 | jermar | 355 | goto out; |
2747 | jermar | 356 | } |
357 | component[len++] = ops->plb_get_char(next); |
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358 | next++; /* process next character */ |
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359 | } |
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360 | assert(len); |
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361 | component[len] = '\0'; |
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362 | |||
4357 | jermar | 363 | fs_node_t *fn; |
2763 | jermar | 364 | if (lflag & L_CREATE) |
4357 | jermar | 365 | fn = ops->create(dev_handle, lflag); |
2763 | jermar | 366 | else |
4357 | jermar | 367 | fn = ops->node_get(dev_handle, index); |
368 | if (fn) { |
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3625 | jermar | 369 | int rc; |
370 | |||
4357 | jermar | 371 | rc = ops->link(cur, fn, component); |
3625 | jermar | 372 | if (rc != EOK) { |
2763 | jermar | 373 | if (lflag & L_CREATE) |
4357 | jermar | 374 | (void)ops->destroy(fn); |
3625 | jermar | 375 | ipc_answer_0(rid, rc); |
2747 | jermar | 376 | } else { |
377 | ipc_answer_5(rid, EOK, |
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378 | fs_handle, dev_handle, |
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4357 | jermar | 379 | ops->index_get(fn), |
380 | ops->size_get(fn), |
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381 | ops->lnkcnt_get(fn)); |
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382 | ops->node_put(fn); |
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2747 | jermar | 383 | } |
384 | } else { |
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385 | ipc_answer_0(rid, ENOSPC); |
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386 | } |
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2852 | jermar | 387 | goto out; |
2747 | jermar | 388 | } |
389 | ipc_answer_0(rid, ENOENT); |
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2852 | jermar | 390 | goto out; |
2747 | jermar | 391 | } |
392 | |||
393 | /* handle hit */ |
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2763 | jermar | 394 | if (lflag & L_UNLINK) { |
2747 | jermar | 395 | unsigned old_lnkcnt = ops->lnkcnt_get(cur); |
4370 | jermar | 396 | int res = ops->unlink(par, cur, component); |
2747 | jermar | 397 | ipc_answer_5(rid, (ipcarg_t)res, fs_handle, dev_handle, |
398 | ops->index_get(cur), ops->size_get(cur), old_lnkcnt); |
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2852 | jermar | 399 | goto out; |
2747 | jermar | 400 | } |
2763 | jermar | 401 | if (((lflag & (L_CREATE | L_EXCLUSIVE)) == (L_CREATE | L_EXCLUSIVE)) || |
402 | (lflag & L_LINK)) { |
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2747 | jermar | 403 | ipc_answer_0(rid, EEXIST); |
2852 | jermar | 404 | goto out; |
2747 | jermar | 405 | } |
406 | if ((lflag & L_FILE) && (ops->is_directory(cur))) { |
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407 | ipc_answer_0(rid, EISDIR); |
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2852 | jermar | 408 | goto out; |
2747 | jermar | 409 | } |
410 | if ((lflag & L_DIRECTORY) && (ops->is_file(cur))) { |
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411 | ipc_answer_0(rid, ENOTDIR); |
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2852 | jermar | 412 | goto out; |
2747 | jermar | 413 | } |
414 | |||
415 | ipc_answer_5(rid, EOK, fs_handle, dev_handle, ops->index_get(cur), |
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416 | ops->size_get(cur), ops->lnkcnt_get(cur)); |
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2852 | jermar | 417 | |
418 | out: |
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419 | if (par) |
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420 | ops->node_put(par); |
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421 | if (cur) |
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422 | ops->node_put(cur); |
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423 | if (tmp) |
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424 | ops->node_put(tmp); |
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2747 | jermar | 425 | } |
426 | |||
2642 | jermar | 427 | /** @} |
428 | */ |