SAFE public projects git trees. - safe/jmp/linux-2.6/blob - fs/gfs2/eaops.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/capability.h>
  15 #include <linux/xattr.h>
  16 #include <linux/gfs2_ondisk.h>
  17 #include <linux/lm_interface.h>
  18 #include <asm/uaccess.h>
  19
  20 #include "gfs2.h"
  21 #include "incore.h"
  22 #include "acl.h"
  23 #include "eaops.h"
  24 #include "eattr.h"
  25 #include "util.h"
  26
  27 /**
  28  * gfs2_ea_name2type - get the type of the ea, and truncate type from the name
  29  * @namep: ea name, possibly with type appended
  30  *
  31  * Returns: GFS2_EATYPE_XXX
  32  */
  33
  34 unsigned int gfs2_ea_name2type(const char *name, const char **truncated_name)
  35 {
  36         unsigned int type;
  37
  38         if (strncmp(name, "system.", 7) == 0) {
  39                 type = GFS2_EATYPE_SYS;
  40                 if (truncated_name)
  41                         *truncated_name = name + sizeof("system.") - 1;
  42         } else if (strncmp(name, "user.", 5) == 0) {
  43                 type = GFS2_EATYPE_USR;
  44                 if (truncated_name)
  45                         *truncated_name = name + sizeof("user.") - 1;
  46         } else if (strncmp(name, "security.", 9) == 0) {
  47                 type = GFS2_EATYPE_SECURITY;
  48                 if (truncated_name)
  49                         *truncated_name = name + sizeof("security.") - 1;
  50         } else {
  51                 type = GFS2_EATYPE_UNUSED;
  52                 if (truncated_name)
  53                         *truncated_name = NULL;
  54         }
  55
  56         return type;
  57 }
  58
  59 static int user_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
  60 {
  61         return gfs2_ea_get_i(ip, er);
  62 }
  63
  64 static int user_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
  65 {
  66         return gfs2_ea_set_i(ip, er);
  67 }
  68
  69 static int user_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
  70 {
  71         return gfs2_ea_remove_i(ip, er);
  72 }
  73
  74 static int system_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
  75 {
  76         if (!GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) &&
  77             !GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len) &&
  78             !capable(CAP_SYS_ADMIN))
  79                 return -EPERM;
  80
  81         if (GFS2_SB(&ip->i_inode)->sd_args.ar_posix_acl == 0 &&
  82             (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) ||
  83              GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)))
  84                 return -EOPNOTSUPP;
  85
  86         return gfs2_ea_get_i(ip, er);
  87 }
  88
  89 static int system_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
  90 {
  91         int remove = 0;
  92         int error;
  93
  94         if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
  95                 if (!(er->er_flags & GFS2_ERF_MODE)) {
  96                         er->er_mode = ip->i_inode.i_mode;
  97                         er->er_flags |= GFS2_ERF_MODE;
  98                 }
  99                 error = gfs2_acl_validate_set(ip, 1, er,
 100                                               &remove, &er->er_mode);
 101                 if (error)
 102                         return error;
 103                 error = gfs2_ea_set_i(ip, er);
 104                 if (error)
 105                         return error;
 106                 if (remove)
 107                         gfs2_ea_remove_i(ip, er);
 108                 return 0;
 109
 110         } else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
 111                 error = gfs2_acl_validate_set(ip, 0, er,
 112                                               &remove, NULL);
 113                 if (error)
 114                         return error;
 115                 if (!remove)
 116                         error = gfs2_ea_set_i(ip, er);
 117                 else {
 118                         error = gfs2_ea_remove_i(ip, er);
 119                         if (error == -ENODATA)
 120                                 error = 0;
 121                 }
 122                 return error;
 123         }
 124
 125         return -EPERM;
 126 }
 127
 128 static int system_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 129 {
 130         if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
 131                 int error = gfs2_acl_validate_remove(ip, 1);
 132                 if (error)
 133                         return error;
 134
 135         } else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
 136                 int error = gfs2_acl_validate_remove(ip, 0);
 137                 if (error)
 138                         return error;
 139
 140         } else
 141                 return -EPERM;
 142
 143         return gfs2_ea_remove_i(ip, er);
 144 }
 145
 146 static int security_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 147 {
 148         return gfs2_ea_get_i(ip, er);
 149 }
 150
 151 static int security_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 152 {
 153         return gfs2_ea_set_i(ip, er);
 154 }
 155
 156 static int security_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 157 {
 158         return gfs2_ea_remove_i(ip, er);
 159 }
 160
 161 static const struct gfs2_eattr_operations gfs2_user_eaops = {
 162         .eo_get = user_eo_get,
 163         .eo_set = user_eo_set,
 164         .eo_remove = user_eo_remove,
 165         .eo_name = "user",
 166 };
 167
 168 const struct gfs2_eattr_operations gfs2_system_eaops = {
 169         .eo_get = system_eo_get,
 170         .eo_set = system_eo_set,
 171         .eo_remove = system_eo_remove,
 172         .eo_name = "system",
 173 };
 174
 175 static const struct gfs2_eattr_operations gfs2_security_eaops = {
 176         .eo_get = security_eo_get,
 177         .eo_set = security_eo_set,
 178         .eo_remove = security_eo_remove,
 179         .eo_name = "security",
 180 };
 181
 182 const struct gfs2_eattr_operations *gfs2_ea_ops[] = {
 183         NULL,
 184         &gfs2_user_eaops,
 185         &gfs2_system_eaops,
 186         &gfs2_security_eaops,
 187 };
 188