1 | /* $Id: VBoxVFS-VFSOps.cpp 69496 2017-10-28 14:55:58Z vboxsync $ */
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2 | /** @file
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3 | * VBoxVFS - Filesystem operations.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2013-2017 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | */
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17 |
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18 | #include <mach/kmod.h>
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19 | #include <libkern/libkern.h>
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20 | #include <mach/mach_types.h>
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21 |
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22 | #include <sys/mount.h>
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23 | #include <sys/vnode.h>
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24 |
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25 | #include <iprt/assert.h>
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26 | #include <iprt/mem.h>
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27 | #include <iprt/asm.h>
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28 |
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29 | #include "vboxvfs.h"
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30 |
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31 | /* States of VBoxVFS object used in atomic variables
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32 | * in order to reach sync between several concurrently running threads. */
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33 | #define VBOXVFS_OBJECT_UNINITIALIZED (0)
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34 | #define VBOXVFS_OBJECT_INITIALIZING (1)
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35 | #define VBOXVFS_OBJECT_INITIALIZED (2)
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36 | #define VBOXVFS_OBJECT_INVALID (3)
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37 |
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38 |
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39 | /**
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40 | * Mount helper: Get mounting parameters from user space and validate them.
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41 | *
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42 | * @param pUserData Mounting parameters provided by user space mount tool.
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43 | * @param pKernelData Buffer to store pUserData in kernel space.
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44 | *
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45 | * @return 0 on success or BSD error code otherwise.
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46 | */
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47 | static int
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48 | vboxvfs_get_mount_info(user_addr_t pUserData, struct vboxvfs_mount_info *pKernelData)
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49 | {
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50 | AssertReturn(pKernelData, EINVAL);
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51 | AssertReturn(pUserData, EINVAL);
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52 |
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53 | /* Get mount parameters from user space */
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54 | if (copyin(pUserData, pKernelData, sizeof(struct vboxvfs_mount_info)) != 0)
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55 | {
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56 | PERROR("Unable to copy mount parameters from user space");
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57 | return EINVAL;
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58 | }
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59 |
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60 | /* Validate data magic */
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61 | if (pKernelData->magic != VBOXVFS_MOUNTINFO_MAGIC)
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62 | {
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63 | PERROR("Mount parameter magic mismatch");
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64 | return EINVAL;
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65 | }
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66 |
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67 | return 0;
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68 | }
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69 |
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70 |
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71 | /**
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72 | * Mount helper: Provide VFS layer with a VBox share name (stored as mounted device).
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73 | *
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74 | * @param mp Mount data provided by VFS layer.
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75 | * @param szShareName VBox share name.
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76 | * @param cbShareName Returning parameter which contains VBox share name string length.
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77 | *
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78 | * @return 0 on success or BSD error code otherwise.
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79 | */
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80 | static int
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81 | vboxvfs_set_share_name(struct mount *mp, char *szShareName, size_t *cbShareName)
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82 | {
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83 | struct vfsstatfs *pVfsInfo;
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84 |
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85 | AssertReturn(mp, EINVAL);
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86 | AssertReturn(szShareName, EINVAL);
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87 | AssertReturn(cbShareName, EINVAL);
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88 |
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89 | pVfsInfo = vfs_statfs(mp);
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90 | if (!pVfsInfo)
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91 | {
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92 | PERROR("Unable to get VFS data for the mount structure");
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93 | return EINVAL;
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94 | }
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95 |
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96 | return copystr(szShareName, pVfsInfo->f_mntfromname, MAXPATHLEN, cbShareName);
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97 | }
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98 |
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99 |
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100 | /**
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101 | * Mount helper: allocate locking group attribute and locking group itself.
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102 | * Store allocated data into VBoxVFS private data.
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103 | *
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104 | * @param pMount VBoxVFS global data which will be updated with
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105 | * locking group and its attribute in case of success;
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106 | * otherwise pMount unchanged.
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107 | *
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108 | * @return 0 on success or BSD error code otherwise.
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109 | *
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110 | */
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111 | static int
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112 | vboxvfs_prepare_locking(vboxvfs_mount_t *pMount)
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113 | {
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114 | lck_grp_attr_t *pGrpAttr;
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115 | lck_grp_t *pGrp;
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116 |
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117 | AssertReturn(pMount, EINVAL);
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118 |
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119 | pGrpAttr = lck_grp_attr_alloc_init();
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120 | if (pGrpAttr)
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121 | {
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122 | pGrp = lck_grp_alloc_init("VBoxVFS", pGrpAttr);
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123 | if (pGrp)
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124 | {
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125 | pMount->pLockGroupAttr = pGrpAttr;
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126 | pMount->pLockGroup = pGrp;
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127 |
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128 | return 0;
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129 | }
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130 | else
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131 | PERROR("Unable to allocate locking group");
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132 |
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133 | lck_grp_attr_free(pGrpAttr);
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134 | }
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135 | else
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136 | PERROR("Unable to allocate locking group attribute");
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137 |
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138 | return ENOMEM;
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139 | }
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140 |
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141 |
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142 | /**
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143 | * Mount and unmount helper: destroy locking group attribute and locking group itself.
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144 | *
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145 | * @param pMount VBoxVFS global data for which locking
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146 | * group and attribute will be deallocated and set to NULL.
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147 | */
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148 | static void
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149 | vboxvfs_destroy_locking(vboxvfs_mount_t *pMount)
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150 | {
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151 | AssertReturnVoid(pMount);
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152 |
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153 | if (pMount->pLockGroup)
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154 | {
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155 | lck_grp_free(pMount->pLockGroup);
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156 | pMount->pLockGroup = NULL;
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157 | }
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158 |
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159 | if (pMount->pLockGroupAttr)
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160 | {
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161 | lck_grp_attr_free(pMount->pLockGroupAttr);
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162 | pMount->pLockGroupAttr = NULL;
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163 | }
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164 | }
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165 |
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166 | /**
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167 | * Mount helper: Allocate and init VBoxVFS global data.
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168 | *
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169 | * @param mp Mount data provided by VFS layer.
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170 | * @param pUserData Mounting parameters provided by user space mount tool.
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171 | *
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172 | * @return VBoxVFS global data or NULL.
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173 | */
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174 | static vboxvfs_mount_t *
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175 | vboxvfs_alloc_internal_data(struct mount *mp, user_addr_t pUserData)
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176 | {
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177 | vboxvfs_mount_t *pMount;
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178 | struct vboxvfs_mount_info mountInfo;
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179 | struct vfsstatfs *pVfsInfo;
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180 | size_t cbShareName;
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181 |
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182 | int rc;
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183 |
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184 | AssertReturn(mp, NULL);
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185 | AssertReturn(pUserData, NULL);
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186 |
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187 | pVfsInfo = vfs_statfs(mp);
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188 | AssertReturn(pVfsInfo, NULL);
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189 |
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190 | /* Allocate memory for VBoxVFS internal data */
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191 | pMount = (vboxvfs_mount_t *)RTMemAllocZ(sizeof(vboxvfs_mount_t));
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192 | if (pMount)
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193 | {
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194 | rc = vboxvfs_get_mount_info(pUserData, &mountInfo);
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195 | if (rc == 0)
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196 | {
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197 | PDEBUG("Mounting shared folder '%s'", mountInfo.name);
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198 |
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199 | /* Prepare for locking. We prepare locking group and attr data here,
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200 | * but allocate and initialize real lock in vboxvfs_create_vnode_internal().
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201 | * We use the same pLockGroup and pLockAttr for all vnodes related to this mount point. */
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202 | rc = vboxvfs_prepare_locking(pMount);
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203 | if (rc == 0)
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204 | {
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205 | rc = vboxvfs_set_share_name(mp, (char *)&mountInfo.name, &cbShareName);
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206 | if (rc == 0)
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207 | {
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208 | pMount->pShareName = vboxvfs_construct_shflstring((char *)&mountInfo.name, cbShareName);
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209 | if (pMount->pShareName)
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210 | {
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211 | /* Remember user who mounted this share */
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212 | pMount->owner = pVfsInfo->f_owner;
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213 |
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214 | /* Mark root vnode as uninitialized */
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215 | ASMAtomicWriteU8(&pMount->fRootVnodeState, VBOXVFS_OBJECT_UNINITIALIZED);
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216 |
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217 | return pMount;
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218 | }
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219 | }
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220 | }
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221 |
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222 | vboxvfs_destroy_locking(pMount);
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223 | }
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224 |
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225 | RTMemFree(pMount);
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226 | }
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227 |
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228 | return NULL;
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229 | }
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230 |
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231 |
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232 | /**
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233 | * Mount and unmount helper: Release VBoxVFS internal resources.
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234 | * Deallocates ppMount as well.
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235 | *
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236 | * @param ppMount Pointer to reference of VBoxVFS internal data.
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237 | */
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238 | static void
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239 | vboxvfs_destroy_internal_data(vboxvfs_mount_t **ppMount)
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240 | {
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241 | AssertReturnVoid(ppMount);
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242 | AssertReturnVoid(*ppMount);
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243 | AssertReturnVoid((*ppMount)->pShareName);
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244 |
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245 | RTMemFree((*ppMount)->pShareName);
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246 | (*ppMount)->pShareName = NULL;
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247 |
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248 | vboxvfs_destroy_locking(*ppMount);
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249 | RTMemFree(*ppMount);
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250 | *ppMount = NULL;
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251 | }
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252 |
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253 |
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254 | /**
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255 | * Mount VBoxVFS.
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256 | *
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257 | * @param mp Mount data provided by VFS layer.
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258 | * @param pDev Device structure provided by VFS layer.
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259 | * @param pUserData Mounting parameters provided by user space mount tool.
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260 | * @param pContext kAuth context needed in order to authentificate mount operation.
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261 | *
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262 | * @return 0 on success or BSD error code otherwise.
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263 | */
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264 | static int
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265 | vboxvfs_mount(struct mount *mp, vnode_t pDev, user_addr_t pUserData, vfs_context_t pContext)
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266 | {
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267 | NOREF(pDev);
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268 | NOREF(pContext);
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269 |
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270 | vboxvfs_mount_t *pMount;
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271 |
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272 | int rc = ENOMEM;
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273 |
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274 | PDEBUG("Mounting...");
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275 |
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276 | pMount = vboxvfs_alloc_internal_data(mp, pUserData);
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277 | if (pMount)
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278 | {
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279 | rc = VbglR0SfMapFolder(&g_vboxSFClient, pMount->pShareName, &pMount->pMap);
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280 | if (RT_SUCCESS(rc))
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281 | {
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282 | /* Private data should be set before vboxvfs_create_vnode_internal() call
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283 | * because we need it in order to create vnode. */
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284 | vfs_setfsprivate(mp, pMount);
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285 |
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286 | /* Reset root vnode */
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287 | pMount->pRootVnode = NULL;
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288 |
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289 | vfs_setflags(mp, MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | MNT_NOSUID | MNT_NODEV);
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290 |
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291 | PDEBUG("VirtualBox shared folder successfully mounted");
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292 |
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293 | return 0;
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294 | }
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295 |
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296 | PDEBUG("Unable to map shared folder");
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297 | vboxvfs_destroy_internal_data(&pMount);
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298 | }
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299 | else
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300 | PDEBUG("Unable to allocate internal data");
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301 |
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302 | return rc;
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303 | }
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304 |
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305 |
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306 | /**
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307 | * Unmount VBoxVFS.
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308 | *
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309 | * @param mp Mount data provided by VFS layer.
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310 | * @param fFlags Unmounting flags.
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311 | * @param pContext kAuth context needed in order to authentificate mount operation.
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312 | *
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313 | * @return 0 on success or BSD error code otherwise.
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314 | */
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315 | static int
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316 | vboxvfs_unmount(struct mount *mp, int fFlags, vfs_context_t pContext)
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317 | {
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318 | NOREF(pContext);
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319 |
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320 | vboxvfs_mount_t *pMount;
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321 | int rc = EBUSY;
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322 | int fFlush = (fFlags & MNT_FORCE) ? FORCECLOSE : 0;
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323 |
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324 | PDEBUG("Attempting to %s unmount a shared folder", (fFlags & MNT_FORCE) ? "forcibly" : "normally");
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325 |
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326 | AssertReturn(mp, EINVAL);
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327 |
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328 | pMount = (vboxvfs_mount_t *)vfs_fsprivate(mp);
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329 |
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330 | AssertReturn(pMount, EINVAL);
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331 | AssertReturn(pMount->pRootVnode, EINVAL);
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332 |
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333 | /* Check if we can do unmount at the moment */
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334 | if (!vnode_isinuse(pMount->pRootVnode, 1))
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335 | {
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336 | /* Flush child vnodes first */
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337 | rc = vflush(mp, pMount->pRootVnode, fFlush);
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338 | if (rc == 0)
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339 | {
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340 | /* Flush root vnode */
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341 | rc = vflush(mp, NULL, fFlush);
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342 | if (rc == 0)
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343 | {
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344 | vfs_setfsprivate(mp, NULL);
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345 |
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346 | rc = VbglR0SfUnmapFolder(&g_vboxSFClient, &pMount->pMap);
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347 | if (RT_SUCCESS(rc))
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348 | {
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349 | vboxvfs_destroy_internal_data(&pMount);
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350 | PDEBUG("A shared folder has been successfully unmounted");
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351 | return 0;
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352 | }
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353 |
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354 | PDEBUG("Unable to unmount shared folder");
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355 | rc = EPROTO;
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356 | }
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357 | else
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358 | PDEBUG("Unable to flush filesystem before unmount, some data might be lost");
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359 | }
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360 | else
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361 | PDEBUG("Unable to flush child vnodes");
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362 |
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363 | }
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364 | else
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365 | PDEBUG("Root vnode is in use, can't unmount");
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366 |
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367 | vnode_put(pMount->pRootVnode);
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368 |
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369 | return rc;
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370 | }
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371 |
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372 |
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373 | /**
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374 | * Get VBoxVFS root vnode.
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375 | *
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376 | * Handle three cases here:
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377 | * - vnode does not exist yet: create a new one
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378 | * - currently creating vnode: wait till the end, increment usage count and return existing one
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379 | * - vnode already created: increment usage count and return existing one
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380 | * - vnode was failed to create: give a chance to try to re-create it later
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381 | *
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382 | * @param mp Mount data provided by VFS layer.
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383 | * @param ppVnode vnode to return.
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384 | * @param pContext kAuth context needed in order to authentificate mount operation.
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385 | *
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386 | * @return 0 on success or BSD error code otherwise.
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387 | */
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388 | static int
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389 | vboxvfs_root(struct mount *mp, struct vnode **ppVnode, vfs_context_t pContext)
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390 | {
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391 | NOREF(pContext);
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392 |
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393 | vboxvfs_mount_t *pMount;
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394 | int rc = 0;
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395 | uint32_t vid;
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396 |
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397 | PDEBUG("Getting root vnode...");
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398 |
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399 | AssertReturn(mp, EINVAL);
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400 | AssertReturn(ppVnode, EINVAL);
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401 |
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402 | pMount = (vboxvfs_mount_t *)vfs_fsprivate(mp);
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403 | AssertReturn(pMount, EINVAL);
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404 |
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405 | /* Check case when vnode does not exist yet */
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406 | if (ASMAtomicCmpXchgU8(&pMount->fRootVnodeState, VBOXVFS_OBJECT_INITIALIZING, VBOXVFS_OBJECT_UNINITIALIZED))
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407 | {
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408 | PDEBUG("Create new root vnode");
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409 |
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410 | /* Allocate empty SHFLSTRING to indicate path to root vnode within Shared Folder */
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411 | char szEmpty[1];
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412 | SHFLSTRING *pSFVnodePath;
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413 |
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414 | pSFVnodePath = vboxvfs_construct_shflstring((char *)szEmpty, 0);
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415 | if (pSFVnodePath)
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416 | {
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417 | int rc2;
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418 | rc2 = vboxvfs_create_vnode_internal(mp, VDIR, NULL, TRUE, pSFVnodePath, &pMount->pRootVnode);
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419 | if (rc2 != 0)
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420 | {
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421 | RTMemFree(pSFVnodePath);
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422 | rc = ENOTSUP;
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423 | }
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424 | }
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425 | else
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426 | rc = ENOMEM;
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427 |
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428 | /* Notify other threads about result */
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429 | if (rc == 0)
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430 | ASMAtomicWriteU8(&pMount->fRootVnodeState, VBOXVFS_OBJECT_INITIALIZED);
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431 | else
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432 | ASMAtomicWriteU8(&pMount->fRootVnodeState, VBOXVFS_OBJECT_INVALID);
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433 | }
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434 | else
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435 | {
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436 | /* Check case if we are currently creating vnode. Wait while other thread to finish allocation. */
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437 | uint8_t fRootVnodeState = VBOXVFS_OBJECT_UNINITIALIZED;
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438 | while (fRootVnodeState != VBOXVFS_OBJECT_INITIALIZED
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439 | && fRootVnodeState != VBOXVFS_OBJECT_INVALID)
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440 | {
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441 | /** @todo Currently, we are burning CPU cycles while waiting. This is for a short
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442 | * time but we should relax here! */
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443 | fRootVnodeState = ASMAtomicReadU8(&pMount->fRootVnodeState);
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444 |
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445 | }
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446 |
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447 | /* Check if the other thread initialized root vnode and it is ready to be returned */
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448 | if (fRootVnodeState == VBOXVFS_OBJECT_INITIALIZED)
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449 | {
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450 | /* Take care about iocount */
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451 | vid = vnode_vid(pMount->pRootVnode);
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452 | rc = vnode_getwithvid(pMount->pRootVnode, vid);
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453 | }
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454 | else
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455 | {
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456 | /* Other thread reported initialization failure.
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457 | * Set vnode state VBOXVFS_OBJECT_UNINITIALIZED in order to try recreate root
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458 | * vnode in other attempt */
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459 | ASMAtomicWriteU8(&pMount->fRootVnodeState, VBOXVFS_OBJECT_UNINITIALIZED);
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460 | }
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461 |
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462 | }
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463 |
|
---|
464 | /* Only return vnode if we got success */
|
---|
465 | if (rc == 0)
|
---|
466 | {
|
---|
467 | PDEBUG("Root vnode can be returned");
|
---|
468 | *ppVnode = pMount->pRootVnode;
|
---|
469 | }
|
---|
470 | else
|
---|
471 | PDEBUG("Root vnode cannot be returned: 0x%X", rc);
|
---|
472 |
|
---|
473 | return rc;
|
---|
474 | }
|
---|
475 |
|
---|
476 | /**
|
---|
477 | * VBoxVFS get VFS layer object attribute callback.
|
---|
478 | *
|
---|
479 | * @param mp Mount data provided by VFS layer.
|
---|
480 | * @param pAttr Output buffer to return attributes.
|
---|
481 | * @param pContext kAuth context needed in order to authentificate mount operation.
|
---|
482 | *
|
---|
483 | * @returns 0 for success, else an error code.
|
---|
484 | */
|
---|
485 | static int
|
---|
486 | vboxvfs_getattr(struct mount *mp, struct vfs_attr *pAttr, vfs_context_t pContext)
|
---|
487 | {
|
---|
488 | NOREF(pContext);
|
---|
489 |
|
---|
490 | vboxvfs_mount_t *pMount;
|
---|
491 | SHFLVOLINFO SHFLVolumeInfo;
|
---|
492 |
|
---|
493 | int rc;
|
---|
494 | uint32_t cbBuffer = sizeof(SHFLVolumeInfo);
|
---|
495 |
|
---|
496 | uint32_t u32bsize;
|
---|
497 | uint64_t u64blocks;
|
---|
498 | uint64_t u64bfree;
|
---|
499 |
|
---|
500 | PDEBUG("Getting attribute...\n");
|
---|
501 |
|
---|
502 | AssertReturn(mp, EINVAL);
|
---|
503 |
|
---|
504 | pMount = (vboxvfs_mount_t *)vfs_fsprivate(mp);
|
---|
505 | AssertReturn(pMount, EINVAL);
|
---|
506 | AssertReturn(pMount->pShareName, EINVAL);
|
---|
507 |
|
---|
508 | rc = VbglR0SfFsInfo(&g_vboxSFClient, &pMount->pMap, 0, SHFL_INFO_GET | SHFL_INFO_VOLUME,
|
---|
509 | &cbBuffer, (PSHFLDIRINFO)&SHFLVolumeInfo);
|
---|
510 | AssertReturn(rc == 0, EPROTO);
|
---|
511 |
|
---|
512 | u32bsize = (uint32_t)SHFLVolumeInfo.ulBytesPerAllocationUnit;
|
---|
513 | AssertReturn(u32bsize > 0, ENOTSUP);
|
---|
514 |
|
---|
515 | u64blocks = (uint64_t)SHFLVolumeInfo.ullTotalAllocationBytes / (uint64_t)u32bsize;
|
---|
516 | u64bfree = (uint64_t)SHFLVolumeInfo.ullAvailableAllocationBytes / (uint64_t)u32bsize;
|
---|
517 |
|
---|
518 | VFSATTR_RETURN(pAttr, f_bsize, u32bsize);
|
---|
519 | VFSATTR_RETURN(pAttr, f_blocks, u64blocks);
|
---|
520 | VFSATTR_RETURN(pAttr, f_bfree, u64bfree);
|
---|
521 | VFSATTR_RETURN(pAttr, f_bavail, u64bfree);
|
---|
522 | VFSATTR_RETURN(pAttr, f_bused, u64blocks - u64bfree);
|
---|
523 |
|
---|
524 | VFSATTR_RETURN(pAttr, f_owner, pMount->owner);
|
---|
525 |
|
---|
526 | VFSATTR_CLEAR_ACTIVE(pAttr, f_iosize);
|
---|
527 | VFSATTR_CLEAR_ACTIVE(pAttr, f_files);
|
---|
528 | VFSATTR_CLEAR_ACTIVE(pAttr, f_ffree);
|
---|
529 | VFSATTR_CLEAR_ACTIVE(pAttr, f_fssubtype);
|
---|
530 |
|
---|
531 | /** @todo take care about f_capabilities and f_attributes, f_fsid */
|
---|
532 | VFSATTR_CLEAR_ACTIVE(pAttr, f_capabilities);
|
---|
533 | VFSATTR_CLEAR_ACTIVE(pAttr, f_attributes);
|
---|
534 | VFSATTR_CLEAR_ACTIVE(pAttr, f_fsid);
|
---|
535 |
|
---|
536 | /** @todo take care about f_create_time, f_modify_time, f_access_time, f_backup_time */
|
---|
537 | VFSATTR_CLEAR_ACTIVE(pAttr, f_create_time);
|
---|
538 | VFSATTR_CLEAR_ACTIVE(pAttr, f_modify_time);
|
---|
539 | VFSATTR_CLEAR_ACTIVE(pAttr, f_access_time);
|
---|
540 | VFSATTR_CLEAR_ACTIVE(pAttr, f_backup_time);
|
---|
541 |
|
---|
542 | VFSATTR_CLEAR_ACTIVE(pAttr, f_signature);
|
---|
543 | VFSATTR_CLEAR_ACTIVE(pAttr, f_carbon_fsid);
|
---|
544 | VFSATTR_CLEAR_ACTIVE(pAttr, f_uuid);
|
---|
545 |
|
---|
546 | if (VFSATTR_IS_ACTIVE(pAttr, f_vol_name))
|
---|
547 | {
|
---|
548 | strlcpy(pAttr->f_vol_name, (char*)pMount->pShareName->String.utf8, MAXPATHLEN);
|
---|
549 | VFSATTR_SET_SUPPORTED(pAttr, f_vol_name);
|
---|
550 | }
|
---|
551 |
|
---|
552 | VFSATTR_ALL_SUPPORTED(pAttr);
|
---|
553 |
|
---|
554 | return 0;
|
---|
555 | }
|
---|
556 |
|
---|
557 | /* VFS options */
|
---|
558 | struct vfsops g_oVBoxVFSOpts = {
|
---|
559 | /* Standard operations */
|
---|
560 | &vboxvfs_mount,
|
---|
561 | NULL, /* Skipped: vfs_start() */
|
---|
562 | &vboxvfs_unmount,
|
---|
563 | &vboxvfs_root,
|
---|
564 | NULL, /* Skipped: vfs_quotactl */
|
---|
565 | &vboxvfs_getattr,
|
---|
566 | NULL, /* Skipped: vfs_sync */
|
---|
567 | NULL, /* Skipped: vfs_vget */
|
---|
568 | NULL, /* Skipped: vfs_fhtovp */
|
---|
569 | NULL, /* Skipped: vfs_vptofh */
|
---|
570 | NULL, /* Skipped: vfs_init */
|
---|
571 | NULL, /* Skipped: vfs_sysctl */
|
---|
572 | NULL, /* Skipped: vfs_setattr */
|
---|
573 | /* Reserved */
|
---|
574 | { NULL, NULL, NULL, NULL, NULL, NULL, NULL, },
|
---|
575 | };
|
---|