1 | /*************************************************************************** |
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2 | * |
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3 | * Copyright (C) 2001 International Business Machines |
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4 | * All rights reserved. |
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5 | * |
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6 | * This file is part of the GPFS mmfslinux kernel module. |
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7 | * |
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8 | * Redistribution and use in source and binary forms, with or without |
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9 | * modification, are permitted provided that the following conditions |
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10 | * are met: |
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11 | * |
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12 | * 1. Redistributions of source code must retain the above copyright notice, |
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13 | * this list of conditions and the following disclaimer. |
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14 | * 2. Redistributions in binary form must reproduce the above copyright |
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15 | * notice, this list of conditions and the following disclaimer in the |
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16 | * documentation and/or other materials provided with the distribution. |
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17 | * 3. The name of the author may not be used to endorse or promote products |
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18 | * derived from this software without specific prior written |
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19 | * permission. |
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20 | * |
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21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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22 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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23 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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24 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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25 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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26 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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27 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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28 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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29 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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30 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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31 | * |
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32 | *************************************************************************** */ |
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33 | /* @(#)00 1.19.1.1 src/avs/fs/mmfs/ts/kernext/gpl-linux/acl.c, mmfs, avs_rgpfs24, rgpfs24s012a 4/17/07 15:54:41 */ |
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34 | |
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35 | #if LINUX_KERNEL_VERSION > 2060000 |
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36 | #ifdef CONFIG_FS_POSIX_ACL |
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37 | #include <Shark-gpl.h> |
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38 | |
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39 | #include <linux/string.h> |
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40 | #include <linux/module.h> |
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41 | #include <linux/errno.h> |
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42 | #include <linux/fs.h> |
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43 | #include <linux/smp_lock.h> |
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44 | |
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45 | #include <verdep.h> |
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46 | #include <cxiTSFattr.h> |
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47 | #include <cxiAclUser.h> |
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48 | |
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49 | /* Defines from posix_acl.h. We can not include that file because it conflicts |
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50 | with GPFS defines in cxiAclUser.h. We can rename all of GPFS defines but it |
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51 | will require many changes. */ |
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52 | #define LINUX_ACL_UNDEFINED_ID (-1) |
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53 | |
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54 | /* e_tag entry in struct posix_acl_entry */ |
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55 | #define LINUX_ACL_USER_OBJ (0x01) |
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56 | #define LINUX_ACL_USER (0x02) |
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57 | #define LINUX_ACL_GROUP_OBJ (0x04) |
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58 | #define LINUX_ACL_GROUP (0x08) |
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59 | #define LINUX_ACL_MASK (0x10) |
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60 | #define LINUX_ACL_OTHER (0x20) |
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61 | |
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62 | /* permissions in the e_perm field */ |
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63 | #define LINUX_ACL_READ (0x04) |
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64 | #define LINUX_ACL_WRITE (0x02) |
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65 | #define LINUX_ACL_EXECUTE (0x01) |
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66 | |
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67 | struct linux_posix_acl_entry { |
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68 | short e_tag; |
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69 | unsigned short e_perm; |
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70 | unsigned int e_id; |
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71 | }; |
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72 | |
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73 | struct linux_posix_acl { |
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74 | atomic_t a_refcount; |
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75 | unsigned int a_count; |
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76 | struct linux_posix_acl_entry a_entries[0]; |
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77 | }; |
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78 | |
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79 | struct linux_posix_acl * posix_acl_from_xattr(const void *value, size_t size); |
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80 | extern int posix_acl_valid(const struct linux_posix_acl *); |
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81 | int posix_acl_to_xattr(const struct linux_posix_acl *acl, void *buffer, size_t size); |
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82 | |
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83 | #define PERM_MASK_2_POSIX(perm) perm&(LINUX_ACL_READ|LINUX_ACL_WRITE|LINUX_ACL_EXECUTE) |
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84 | #define PERM_MASK_2_ACL(perm) perm&(ACL_PERM_EXECUTE|ACL_PERM_WRITE|ACL_PERM_READ) |
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85 | |
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86 | /* move data from ACL to linux_posix_acl */ |
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87 | int |
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88 | ACL_2_posix_acl(ACL *tmpaclP, const void *buf, size_t buf_size) |
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89 | { |
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90 | int i, len; |
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91 | int rc = 0, count = 0; |
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92 | acl_entry_t *aceP; |
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93 | struct linux_posix_acl *aclP = (struct linux_posix_acl *)buf; |
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94 | |
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95 | ENTER(0); |
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96 | memset(aclP, '\0', buf_size); |
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97 | |
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98 | TRACE2(TRACE_VNODE, 3, TRCID_LINUXOPS_ACL2POSIX_ENTER, |
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99 | "ACL_2_posix_acl: enter size %d buf_size %d\n", |
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100 | tmpaclP->aclLength, buf_size); |
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101 | |
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102 | /* POSIX ACLs only. Other types require additional translations. */ |
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103 | if (tmpaclP->aclVersion != ACL_FIRST_VERSION) |
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104 | { |
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105 | rc = -EOPNOTSUPP; |
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106 | goto xerror; |
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107 | } |
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108 | |
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109 | if (buf_size == 0) { |
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110 | rc = tmpaclP->aclLength; |
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111 | goto xerror; |
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112 | } |
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113 | |
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114 | /* Get the address of the first extended acl entry */ |
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115 | aceP = ACL_ENTRY_START(tmpaclP, tmpaclP->aclVersion); |
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116 | len = tmpaclP->aclLength - ACL_HEADER_SIZE_V1; |
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117 | buf_size -= sizeof(struct linux_posix_acl); |
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118 | i = 0; |
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119 | |
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120 | while ((len > 4) && (len >= aceP->aceLength)) |
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121 | { |
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122 | TRACE3(TRACE_VNODE, 3, TRCID_LINUXOPS_ACL2POSIX_2, |
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123 | "ACL_2_posix_acl: %d len %d buf_size %d\n", |
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124 | i, len, buf_size); |
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125 | |
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126 | if (buf_size < sizeof(struct linux_posix_acl_entry)) { |
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127 | rc = -ENOSPC; |
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128 | goto xerror; |
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129 | } |
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130 | switch(aceP->aceTagType) |
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131 | { |
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132 | case ACL_USER: |
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133 | aclP->a_entries[i].e_tag = LINUX_ACL_USER; |
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134 | aclP->a_entries[i].e_id = aceP->aceQualifier; |
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135 | break; |
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136 | case ACL_GROUP: |
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137 | aclP->a_entries[i].e_tag = LINUX_ACL_GROUP; |
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138 | aclP->a_entries[i].e_id = aceP->aceQualifier; |
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139 | break; |
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140 | case ACL_USER_OBJ: |
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141 | aclP->a_entries[i].e_tag = LINUX_ACL_USER_OBJ; |
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142 | aclP->a_entries[i].e_id = LINUX_ACL_UNDEFINED_ID; |
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143 | break; |
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144 | case ACL_GROUP_OBJ: |
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145 | aclP->a_entries[i].e_tag = LINUX_ACL_GROUP_OBJ; |
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146 | aclP->a_entries[i].e_id = LINUX_ACL_UNDEFINED_ID; |
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147 | break; |
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148 | case ACL_OTHER: |
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149 | aclP->a_entries[i].e_tag = LINUX_ACL_OTHER; |
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150 | aclP->a_entries[i].e_id = LINUX_ACL_UNDEFINED_ID; |
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151 | break; |
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152 | case ACL_MASK: |
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153 | aclP->a_entries[i].e_tag = LINUX_ACL_MASK; |
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154 | aclP->a_entries[i].e_id = LINUX_ACL_UNDEFINED_ID; |
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155 | break; |
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156 | } |
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157 | aclP->a_entries[i].e_perm = PERM_MASK_2_POSIX(aceP->acePermissions); |
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158 | |
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159 | TRACE7(TRACE_VNODE, 3, TRCID_LINUXOPS_ACL2POSIX, |
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160 | "ACL_2_posix_acl: %d e_tag 0x%02X aceTagType %d e_id %d aceQualifier %d e_perm 0x%02X acePermissions 0x%01X\n", |
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161 | i, aclP->a_entries[i].e_tag, aceP->aceTagType, aclP->a_entries[i].e_id, |
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162 | aceP->aceQualifier, aclP->a_entries[i].e_perm, aceP->acePermissions); |
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163 | |
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164 | /* move to the next acl entry */ |
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165 | len -= aceP->aceLength; |
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166 | aceP = (acl_entry_t *)((caddr_t)aceP + aceP->aceLength); |
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167 | buf_size -= sizeof(struct linux_posix_acl_entry); |
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168 | i++; |
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169 | } |
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170 | aclP->a_count = i; |
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171 | |
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172 | xerror: |
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173 | TRACE1(TRACE_VNODE, 1, TRCID_LINUXOPS_ACL2POSIX_EXIT, |
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174 | "ACL_2_posix_acl: exit rc %d\n", rc); |
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175 | |
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176 | EXIT(0); |
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177 | return rc; |
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178 | } |
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179 | |
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180 | /* move data from linux_posix_acl to ACL */ |
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181 | void |
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182 | posix_acl_2_ACL(ACL *tmpaclP, struct linux_posix_acl *aclP) |
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183 | { |
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184 | int i, count; |
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185 | acl_entry_t *aceP; |
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186 | |
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187 | count = aclP->a_count; |
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188 | /* Get the address of the first extended acl entry */ |
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189 | aceP = ACL_ENTRY_START(tmpaclP, tmpaclP->aclVersion); |
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190 | |
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191 | for (i = 0; i < count; i++) |
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192 | { |
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193 | if (aclP->a_entries[i].e_tag & LINUX_ACL_USER) { |
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194 | aceP->aceTagType = ACL_USER; |
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195 | aceP->aceQualifier = aclP->a_entries[i].e_id; |
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196 | } |
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197 | if (aclP->a_entries[i].e_tag & LINUX_ACL_GROUP) { |
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198 | aceP->aceTagType = ACL_GROUP; |
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199 | aceP->aceQualifier = aclP->a_entries[i].e_id; |
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200 | } |
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201 | if (aclP->a_entries[i].e_tag & LINUX_ACL_USER_OBJ) { |
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202 | aceP->aceTagType = ACL_USER_OBJ; |
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203 | aceP->aceQualifier = aclP->a_entries[i].e_id; |
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204 | } |
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205 | if (aclP->a_entries[i].e_tag & LINUX_ACL_GROUP_OBJ) { |
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206 | aceP->aceTagType = ACL_GROUP_OBJ; |
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207 | aceP->aceQualifier = aclP->a_entries[i].e_id; |
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208 | } |
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209 | if (aclP->a_entries[i].e_tag & LINUX_ACL_OTHER) { |
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210 | aceP->aceTagType = ACL_OTHER; |
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211 | aceP->aceQualifier = aclP->a_entries[i].e_id; |
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212 | } |
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213 | if (aclP->a_entries[i].e_tag & LINUX_ACL_MASK) { |
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214 | aceP->aceTagType = ACL_MASK; |
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215 | aceP->aceQualifier = aclP->a_entries[i].e_id; |
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216 | } |
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217 | aceP->acePermissions = PERM_MASK_2_ACL(aclP->a_entries[i].e_perm); |
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218 | aceP->aceLength = sizeof(acl_entry_t); |
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219 | |
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220 | TRACE6(TRACE_VNODE, 3, TRCID_LINUXOPS_POSIX2ACL, |
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221 | "posix_acl_2_ACL: %d e_tag 0x%X aceTagType %d aceQualifier %d e_perm 0x%X acePermissions 0x%X\n", |
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222 | i, aclP->a_entries[i].e_tag, aceP->aceTagType, aceP->aceQualifier, |
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223 | aclP->a_entries[i].e_perm, aceP->acePermissions); |
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224 | |
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225 | /* move to the next acl entry */ |
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226 | aceP = (acl_entry_t *)((caddr_t)aceP + sizeof(acl_entry_t)); |
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227 | } |
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228 | } |
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229 | |
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230 | int |
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231 | gpfs_set_posix_acl(struct dentry *dentry, int type, const void *buf, size_t buf_size) |
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232 | { |
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233 | int count, size, rc; |
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234 | cxiNode_t *cnP; |
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235 | struct gpfsVfsData_t *privVfsP; |
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236 | ext_cred_t eCred; |
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237 | ACL tmpacl, *tmpaclP = &tmpacl; |
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238 | int flags = 0; |
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239 | struct inode *iP = dentry->d_inode; |
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240 | struct linux_posix_acl *aclP = NULL; |
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241 | mm_segment_t oldfs; |
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242 | |
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243 | ENTER(0); |
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244 | TRACE5(TRACE_VNODE, 1, TRCID_LINUXOPS_SETACLATTR_ENTER, |
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245 | "gpfs_i_gpfs_set_posix_acl enter: iP 0x%lX ino %d type 0x%X buf 0x%lX size %d\n", |
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246 | iP, iP->i_ino, type, buf, buf_size); |
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247 | |
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248 | if (buf) { |
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249 | aclP = posix_acl_from_xattr(buf, buf_size); |
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250 | if (IS_ERR(aclP)) { |
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251 | rc = PTR_ERR(aclP); |
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252 | aclP = NULL; /* no aclP to free on exit */ |
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253 | goto xerror; |
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254 | } |
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255 | } |
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256 | |
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257 | if (aclP == NULL) { |
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258 | /* If no buf was given, or no acl was returned, there is nothing else |
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259 | * to do. This is in effect deleting all extended ACLs. |
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260 | */ |
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261 | memset(tmpaclP, '\0', sizeof(ACL)); |
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262 | tmpaclP->aclLength = ACL_HEADER_SIZE_V1; |
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263 | if (type == ACL_TYPE_ACCESS) |
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264 | tmpaclP->aclType = ACL_TYPE_ACCESS_DELETE; |
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265 | else if (type == ACL_TYPE_DEFAULT) |
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266 | tmpaclP->aclType = ACL_TYPE_DEFAULT_DELETE; |
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267 | else |
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268 | { |
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269 | rc = EINVAL; |
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270 | goto xerror; |
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271 | } |
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272 | } |
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273 | else { |
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274 | rc = posix_acl_valid(aclP); |
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275 | if (rc) |
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276 | goto xerror; |
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277 | |
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278 | count = aclP->a_count; |
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279 | size = ACL_HEADER_SIZE_V1 + (sizeof(acl_entry_t) * count); |
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280 | if (size > sizeof(ACL)) { |
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281 | tmpaclP = cxiMallocUnpinned(size); |
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282 | if (tmpaclP == NULL) { |
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283 | rc = ENOMEM; |
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284 | goto xerror; |
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285 | } |
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286 | } |
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287 | memset(tmpaclP, '\0', size); |
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288 | tmpaclP->aclLength = size; |
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289 | tmpaclP->aclType = type; |
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290 | } |
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291 | |
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292 | tmpaclP->aclVersion = ACL_FIRST_VERSION; |
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293 | |
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294 | privVfsP = VP_TO_PVP(iP); |
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295 | DBGASSERT(privVfsP != NULL); |
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296 | cnP = VP_TO_CNP(iP); |
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297 | |
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298 | /* Retrieve the ACL data */ |
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299 | setCred(&eCred); |
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300 | |
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301 | oldfs = get_fs(); |
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302 | set_fs(get_ds()); |
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303 | if (aclP) |
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304 | posix_acl_2_ACL(tmpaclP, aclP); |
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305 | |
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306 | rc = gpfs_ops.gpfsPutAcl(privVfsP, cnP, flags, tmpaclP, &eCred); |
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307 | set_fs(oldfs); |
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308 | |
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309 | xerror: |
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310 | if (aclP) |
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311 | kfree(aclP); |
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312 | |
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313 | if (tmpaclP && (tmpaclP != &tmpacl)) |
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314 | cxiFreeUnpinned(tmpaclP); |
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315 | |
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316 | TRACE2(TRACE_VNODE, 1, TRCID_LINUXOPS_SETACLATTR_EXIT, |
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317 | "gpfs_i_gpfs_set_posix_acl exit: iP 0x%lX rc %d\n", iP, rc); |
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318 | EXIT(0); |
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319 | return rc; |
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320 | } |
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321 | |
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322 | int |
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323 | gpfs_get_posix_acl(struct dentry *dentry, int type, const void *buf, size_t buf_size) |
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324 | { |
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325 | int rc = 0; |
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326 | int i, size; |
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327 | cxiNode_t *cnP; |
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328 | struct gpfsVfsData_t *privVfsP; |
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329 | ext_cred_t eCred; |
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330 | int flags = GETACL_DONOT_BLD_ACL; |
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331 | ACL tmpacl, *tmpaclP = &tmpacl; |
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332 | struct inode *iP = dentry->d_inode; |
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333 | mm_segment_t oldfs; |
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334 | |
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335 | ENTER(0); |
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336 | TRACE3(TRACE_VNODE, 1, TRCID_LINUXOPS_GETACLATTR_ENTER, |
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337 | "gpfs_get_posix_acl enter: iP 0x%lX type %d size %d\n", iP, type, buf_size); |
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338 | |
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339 | privVfsP = VP_TO_PVP(iP); |
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340 | DBGASSERT(privVfsP != NULL); |
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341 | cnP = VP_TO_CNP(iP); |
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342 | |
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343 | /* Retrieve the ACL data */ |
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344 | size = sizeof(ACL); |
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345 | |
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346 | try_again: |
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347 | |
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348 | setCred(&eCred); // ids may have been remapped before goto try_again |
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349 | |
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350 | tmpaclP->aclType = type; |
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351 | tmpaclP->aclVersion = ACL_FIRST_VERSION; |
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352 | tmpaclP->aclLength = size; |
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353 | |
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354 | oldfs = get_fs(); |
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355 | set_fs(get_ds()); |
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356 | rc = gpfs_ops.gpfsGetAcl(privVfsP, cnP, flags, tmpaclP, &eCred); |
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357 | set_fs(oldfs); |
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358 | if (rc) |
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359 | { |
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360 | if (rc == ENOSPC) |
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361 | { |
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362 | if (tmpaclP->aclLength >= size) |
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363 | { |
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364 | size = tmpaclP->aclLength; |
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365 | if (tmpaclP != &tmpacl) |
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366 | cxiFreeUnpinned(tmpaclP); |
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367 | tmpaclP = cxiMallocUnpinned(size); |
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368 | if (!tmpaclP) |
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369 | { |
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370 | rc = -ENOMEM; |
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371 | goto xerror; |
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372 | } |
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373 | goto try_again; |
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374 | } |
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375 | else |
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376 | { |
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377 | rc = -EINVAL; // buffer not even big enough to return length |
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378 | goto xerror; |
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379 | } |
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380 | } |
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381 | else { |
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382 | if (rc == ENOENT) |
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383 | rc = ENODATA; |
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384 | rc = -rc; |
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385 | goto xerror; |
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386 | } |
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387 | } |
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388 | |
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389 | /* move data from ACL to linux_posix_acl */ |
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390 | rc = ACL_2_posix_acl(tmpaclP, buf, buf_size); |
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391 | if (!rc) { |
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392 | if (size < buf_size) { |
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393 | if (tmpaclP != &tmpacl) |
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394 | cxiFreeUnpinned(tmpaclP); |
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395 | tmpaclP = cxiMallocUnpinned(buf_size); |
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396 | if (!tmpaclP) |
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397 | { |
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398 | rc = -ENOMEM; |
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399 | goto xerror; |
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400 | } |
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401 | } |
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402 | memcpy(tmpaclP, buf, buf_size); |
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403 | rc = posix_acl_to_xattr((struct linux_posix_acl *)tmpaclP, (void *)buf, size); |
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404 | } |
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405 | xerror: |
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406 | |
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407 | if (tmpaclP != &tmpacl) |
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408 | cxiFreeUnpinned(tmpaclP); |
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409 | |
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410 | TRACE2(TRACE_VNODE, 1, TRCID_LINUXOPS_GETACLATTR_EXIT, |
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411 | "gpfs_get_posix_acl exit: iP 0x%lX rc %d\n", iP, rc); |
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412 | |
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413 | EXIT(0); |
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414 | return rc; |
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415 | } |
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416 | #endif /* CONFIG_FS_POSIX_ACL */ |
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417 | #endif /* LINUX_KERNEL_VERSION > 2060000 */ |
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