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TOMOYO Linux Cross Reference
Linux/fs/orangefs/acl.c

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  1 /*
  2  * (C) 2001 Clemson University and The University of Chicago
  3  *
  4  * See COPYING in top-level directory.
  5  */
  6 
  7 #include "protocol.h"
  8 #include "orangefs-kernel.h"
  9 #include "orangefs-bufmap.h"
 10 #include <linux/posix_acl_xattr.h>
 11 #include <linux/fs_struct.h>
 12 
 13 struct posix_acl *orangefs_get_acl(struct inode *inode, int type)
 14 {
 15         struct posix_acl *acl;
 16         int ret;
 17         char *key = NULL, *value = NULL;
 18 
 19         switch (type) {
 20         case ACL_TYPE_ACCESS:
 21                 key = ORANGEFS_XATTR_NAME_ACL_ACCESS;
 22                 break;
 23         case ACL_TYPE_DEFAULT:
 24                 key = ORANGEFS_XATTR_NAME_ACL_DEFAULT;
 25                 break;
 26         default:
 27                 gossip_err("orangefs_get_acl: bogus value of type %d\n", type);
 28                 return ERR_PTR(-EINVAL);
 29         }
 30         /*
 31          * Rather than incurring a network call just to determine the exact
 32          * length of the attribute, I just allocate a max length to save on
 33          * the network call. Conceivably, we could pass NULL to
 34          * orangefs_inode_getxattr() to probe the length of the value, but
 35          * I don't do that for now.
 36          */
 37         value = kmalloc(ORANGEFS_MAX_XATTR_VALUELEN, GFP_KERNEL);
 38         if (value == NULL)
 39                 return ERR_PTR(-ENOMEM);
 40 
 41         gossip_debug(GOSSIP_ACL_DEBUG,
 42                      "inode %pU, key %s, type %d\n",
 43                      get_khandle_from_ino(inode),
 44                      key,
 45                      type);
 46         ret = orangefs_inode_getxattr(inode,
 47                                    "",
 48                                    key,
 49                                    value,
 50                                    ORANGEFS_MAX_XATTR_VALUELEN);
 51         /* if the key exists, convert it to an in-memory rep */
 52         if (ret > 0) {
 53                 acl = posix_acl_from_xattr(&init_user_ns, value, ret);
 54         } else if (ret == -ENODATA || ret == -ENOSYS) {
 55                 acl = NULL;
 56         } else {
 57                 gossip_err("inode %pU retrieving acl's failed with error %d\n",
 58                            get_khandle_from_ino(inode),
 59                            ret);
 60                 acl = ERR_PTR(ret);
 61         }
 62         /* kfree(NULL) is safe, so don't worry if value ever got used */
 63         kfree(value);
 64         return acl;
 65 }
 66 
 67 int orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 68 {
 69         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 70         int error = 0;
 71         void *value = NULL;
 72         size_t size = 0;
 73         const char *name = NULL;
 74 
 75         switch (type) {
 76         case ACL_TYPE_ACCESS:
 77                 name = ORANGEFS_XATTR_NAME_ACL_ACCESS;
 78                 if (acl) {
 79                         umode_t mode = inode->i_mode;
 80                         /*
 81                          * can we represent this with the traditional file
 82                          * mode permission bits?
 83                          */
 84                         error = posix_acl_equiv_mode(acl, &mode);
 85                         if (error < 0) {
 86                                 gossip_err("%s: posix_acl_equiv_mode err: %d\n",
 87                                            __func__,
 88                                            error);
 89                                 return error;
 90                         }
 91 
 92                         if (inode->i_mode != mode)
 93                                 SetModeFlag(orangefs_inode);
 94                         inode->i_mode = mode;
 95                         mark_inode_dirty_sync(inode);
 96                         if (error == 0)
 97                                 acl = NULL;
 98                 }
 99                 break;
100         case ACL_TYPE_DEFAULT:
101                 name = ORANGEFS_XATTR_NAME_ACL_DEFAULT;
102                 break;
103         default:
104                 gossip_err("%s: invalid type %d!\n", __func__, type);
105                 return -EINVAL;
106         }
107 
108         gossip_debug(GOSSIP_ACL_DEBUG,
109                      "%s: inode %pU, key %s type %d\n",
110                      __func__, get_khandle_from_ino(inode),
111                      name,
112                      type);
113 
114         if (acl) {
115                 size = posix_acl_xattr_size(acl->a_count);
116                 value = kmalloc(size, GFP_KERNEL);
117                 if (!value)
118                         return -ENOMEM;
119 
120                 error = posix_acl_to_xattr(&init_user_ns, acl, value, size);
121                 if (error < 0)
122                         goto out;
123         }
124 
125         gossip_debug(GOSSIP_ACL_DEBUG,
126                      "%s: name %s, value %p, size %zd, acl %p\n",
127                      __func__, name, value, size, acl);
128         /*
129          * Go ahead and set the extended attribute now. NOTE: Suppose acl
130          * was NULL, then value will be NULL and size will be 0 and that
131          * will xlate to a removexattr. However, we don't want removexattr
132          * complain if attributes does not exist.
133          */
134         error = orangefs_inode_setxattr(inode, "", name, value, size, 0);
135 
136 out:
137         kfree(value);
138         if (!error)
139                 set_cached_acl(inode, type, acl);
140         return error;
141 }
142 
143 int orangefs_init_acl(struct inode *inode, struct inode *dir)
144 {
145         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
146         struct posix_acl *default_acl, *acl;
147         umode_t mode = inode->i_mode;
148         int error = 0;
149 
150         ClearModeFlag(orangefs_inode);
151 
152         error = posix_acl_create(dir, &mode, &default_acl, &acl);
153         if (error)
154                 return error;
155 
156         if (default_acl) {
157                 error = orangefs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
158                 posix_acl_release(default_acl);
159         }
160 
161         if (acl) {
162                 if (!error)
163                         error = orangefs_set_acl(inode, acl, ACL_TYPE_ACCESS);
164                 posix_acl_release(acl);
165         }
166 
167         /* If mode of the inode was changed, then do a forcible ->setattr */
168         if (mode != inode->i_mode) {
169                 SetModeFlag(orangefs_inode);
170                 inode->i_mode = mode;
171                 orangefs_flush_inode(inode);
172         }
173 
174         return error;
175 }
176 

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