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

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  1 /*
  2  *   Copyright (C) International Business Machines  Corp., 2002-2004
  3  *   Copyright (C) Andreas Gruenbacher, 2001
  4  *   Copyright (C) Linus Torvalds, 1991, 1992
  5  *
  6  *   This program is free software;  you can redistribute it and/or modify
  7  *   it under the terms of the GNU General Public License as published by
  8  *   the Free Software Foundation; either version 2 of the License, or
  9  *   (at your option) any later version.
 10  *
 11  *   This program is distributed in the hope that it will be useful,
 12  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 14  *   the GNU General Public License for more details.
 15  *
 16  *   You should have received a copy of the GNU General Public License
 17  *   along with this program;  if not, write to the Free Software
 18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 19  */
 20 
 21 #include <linux/sched.h>
 22 #include <linux/slab.h>
 23 #include <linux/fs.h>
 24 #include <linux/posix_acl_xattr.h>
 25 #include "jfs_incore.h"
 26 #include "jfs_txnmgr.h"
 27 #include "jfs_xattr.h"
 28 #include "jfs_acl.h"
 29 
 30 struct posix_acl *jfs_get_acl(struct inode *inode, int type)
 31 {
 32         struct posix_acl *acl;
 33         char *ea_name;
 34         int size;
 35         char *value = NULL;
 36 
 37         acl = get_cached_acl(inode, type);
 38         if (acl != ACL_NOT_CACHED)
 39                 return acl;
 40 
 41         switch(type) {
 42                 case ACL_TYPE_ACCESS:
 43                         ea_name = POSIX_ACL_XATTR_ACCESS;
 44                         break;
 45                 case ACL_TYPE_DEFAULT:
 46                         ea_name = POSIX_ACL_XATTR_DEFAULT;
 47                         break;
 48                 default:
 49                         return ERR_PTR(-EINVAL);
 50         }
 51 
 52         size = __jfs_getxattr(inode, ea_name, NULL, 0);
 53 
 54         if (size > 0) {
 55                 value = kmalloc(size, GFP_KERNEL);
 56                 if (!value)
 57                         return ERR_PTR(-ENOMEM);
 58                 size = __jfs_getxattr(inode, ea_name, value, size);
 59         }
 60 
 61         if (size < 0) {
 62                 if (size == -ENODATA)
 63                         acl = NULL;
 64                 else
 65                         acl = ERR_PTR(size);
 66         } else {
 67                 acl = posix_acl_from_xattr(&init_user_ns, value, size);
 68         }
 69         kfree(value);
 70         if (!IS_ERR(acl))
 71                 set_cached_acl(inode, type, acl);
 72         return acl;
 73 }
 74 
 75 static int __jfs_set_acl(tid_t tid, struct inode *inode, int type,
 76                        struct posix_acl *acl)
 77 {
 78         char *ea_name;
 79         int rc;
 80         int size = 0;
 81         char *value = NULL;
 82 
 83         switch (type) {
 84         case ACL_TYPE_ACCESS:
 85                 ea_name = POSIX_ACL_XATTR_ACCESS;
 86                 if (acl) {
 87                         rc = posix_acl_update_mode(inode, &inode->i_mode, &acl);
 88                         if (rc)
 89                                 return rc;
 90                         inode->i_ctime = CURRENT_TIME;
 91                         mark_inode_dirty(inode);
 92                 }
 93                 break;
 94         case ACL_TYPE_DEFAULT:
 95                 ea_name = POSIX_ACL_XATTR_DEFAULT;
 96                 break;
 97         default:
 98                 return -EINVAL;
 99         }
100 
101         if (acl) {
102                 size = posix_acl_xattr_size(acl->a_count);
103                 value = kmalloc(size, GFP_KERNEL);
104                 if (!value)
105                         return -ENOMEM;
106                 rc = posix_acl_to_xattr(&init_user_ns, acl, value, size);
107                 if (rc < 0)
108                         goto out;
109         }
110         rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0);
111 out:
112         kfree(value);
113 
114         if (!rc)
115                 set_cached_acl(inode, type, acl);
116 
117         return rc;
118 }
119 
120 int jfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
121 {
122         int rc;
123         tid_t tid;
124 
125         tid = txBegin(inode->i_sb, 0);
126         mutex_lock(&JFS_IP(inode)->commit_mutex);
127         rc = __jfs_set_acl(tid, inode, type, acl);
128         if (!rc)
129                 rc = txCommit(tid, 1, &inode, 0);
130         txEnd(tid);
131         mutex_unlock(&JFS_IP(inode)->commit_mutex);
132         return rc;
133 }
134 
135 int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir)
136 {
137         struct posix_acl *default_acl, *acl;
138         int rc = 0;
139 
140         rc = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
141         if (rc)
142                 return rc;
143 
144         if (default_acl) {
145                 rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl);
146                 posix_acl_release(default_acl);
147         }
148 
149         if (acl) {
150                 if (!rc)
151                         rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl);
152                 posix_acl_release(acl);
153         }
154 
155         JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) |
156                                inode->i_mode;
157 
158         return rc;
159 }
160 

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