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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - fs/jfs/acl.c
2 * Copyright (C) International Business Machines Corp., 2002-2004
3 * Copyright (C) Andreas Gruenbacher, 2001
4 * Copyright (C) Linus Torvalds, 1991, 1992
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.
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.
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
21 #include <linux/sched.h>
22 #include <linux/slab.h>
24 #include <linux/posix_acl_xattr.h>
25 #include "jfs_incore.h"
26 #include "jfs_txnmgr.h"
27 #include "jfs_xattr.h"
30 struct posix_acl
*jfs_get_acl(struct inode
*inode
, int type
)
32 struct posix_acl
*acl
;
37 acl
= get_cached_acl(inode
, type
);
38 if (acl
!= ACL_NOT_CACHED
)
43 ea_name
= POSIX_ACL_XATTR_ACCESS
;
45 case ACL_TYPE_DEFAULT
:
46 ea_name
= POSIX_ACL_XATTR_DEFAULT
;
49 return ERR_PTR(-EINVAL
);
52 size
= __jfs_getxattr(inode
, ea_name
, NULL
, 0);
55 value
= kmalloc(size
, GFP_KERNEL
);
57 return ERR_PTR(-ENOMEM
);
58 size
= __jfs_getxattr(inode
, ea_name
, value
, size
);
67 acl
= posix_acl_from_xattr(value
, size
);
71 set_cached_acl(inode
, type
, acl
);
75 static int jfs_set_acl(tid_t tid
, struct inode
*inode
, int type
,
76 struct posix_acl
*acl
)
83 if (S_ISLNK(inode
->i_mode
))
88 ea_name
= POSIX_ACL_XATTR_ACCESS
;
90 case ACL_TYPE_DEFAULT
:
91 ea_name
= POSIX_ACL_XATTR_DEFAULT
;
92 if (!S_ISDIR(inode
->i_mode
))
93 return acl
? -EACCES
: 0;
99 size
= posix_acl_xattr_size(acl
->a_count
);
100 value
= kmalloc(size
, GFP_KERNEL
);
103 rc
= posix_acl_to_xattr(acl
, value
, size
);
107 rc
= __jfs_setxattr(tid
, inode
, ea_name
, value
, size
, 0);
112 set_cached_acl(inode
, type
, acl
);
117 int jfs_init_acl(tid_t tid
, struct inode
*inode
, struct inode
*dir
)
119 struct posix_acl
*acl
= NULL
;
122 if (S_ISLNK(inode
->i_mode
))
125 acl
= jfs_get_acl(dir
, ACL_TYPE_DEFAULT
);
130 mode_t mode
= inode
->i_mode
;
131 if (S_ISDIR(inode
->i_mode
)) {
132 rc
= jfs_set_acl(tid
, inode
, ACL_TYPE_DEFAULT
, acl
);
136 rc
= posix_acl_create(&acl
, GFP_KERNEL
, &mode
);
138 goto cleanup
; /* posix_acl_release(NULL) is no-op */
139 inode
->i_mode
= mode
;
141 rc
= jfs_set_acl(tid
, inode
, ACL_TYPE_ACCESS
, acl
);
143 posix_acl_release(acl
);
145 inode
->i_mode
&= ~current_umask();
147 JFS_IP(inode
)->mode2
= (JFS_IP(inode
)->mode2
& 0xffff0000) |
153 int jfs_acl_chmod(struct inode
*inode
)
155 struct posix_acl
*acl
;
159 if (S_ISLNK(inode
->i_mode
))
162 acl
= jfs_get_acl(inode
, ACL_TYPE_ACCESS
);
163 if (IS_ERR(acl
) || !acl
)
166 rc
= posix_acl_chmod(&acl
, GFP_KERNEL
, inode
->i_mode
);
170 tid
= txBegin(inode
->i_sb
, 0);
171 mutex_lock(&JFS_IP(inode
)->commit_mutex
);
172 rc
= jfs_set_acl(tid
, inode
, ACL_TYPE_ACCESS
, acl
);
174 rc
= txCommit(tid
, 1, &inode
, 0);
176 mutex_unlock(&JFS_IP(inode
)->commit_mutex
);
178 posix_acl_release(acl
);