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/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/xattr.h>
16 #include <linux/posix_acl.h>
17 #include <linux/posix_acl_xattr.h>
18 #include <linux/gfs2_ondisk.h>
19
20 #include "gfs2.h"
21 #include "incore.h"
22 #include "acl.h"
23 #include "xattr.h"
24 #include "glock.h"
25 #include "inode.h"
26 #include "meta_io.h"
27 #include "trans.h"
28 #include "util.h"
29
gfs2_acl_name(int type)30 static const char *gfs2_acl_name(int type)
31 {
32 switch (type) {
33 case ACL_TYPE_ACCESS:
34 return GFS2_POSIX_ACL_ACCESS;
35 case ACL_TYPE_DEFAULT:
36 return GFS2_POSIX_ACL_DEFAULT;
37 }
38 return NULL;
39 }
40
gfs2_get_acl(struct inode * inode,int type)41 struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
42 {
43 struct gfs2_inode *ip = GFS2_I(inode);
44 struct posix_acl *acl;
45 const char *name;
46 char *data;
47 int len;
48
49 if (!ip->i_eattr)
50 return NULL;
51
52 name = gfs2_acl_name(type);
53 if (name == NULL)
54 return ERR_PTR(-EINVAL);
55
56 len = gfs2_xattr_acl_get(ip, name, &data);
57 if (len < 0)
58 return ERR_PTR(len);
59 if (len == 0)
60 return NULL;
61
62 acl = posix_acl_from_xattr(&init_user_ns, data, len);
63 kfree(data);
64 return acl;
65 }
66
gfs2_set_acl(struct inode * inode,struct posix_acl * acl,int type)67 int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
68 {
69 int error;
70 int len;
71 char *data;
72 const char *name = gfs2_acl_name(type);
73
74 BUG_ON(name == NULL);
75
76 if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
77 return -E2BIG;
78
79 if (type == ACL_TYPE_ACCESS) {
80 umode_t mode = inode->i_mode;
81
82 error = posix_acl_update_mode(inode, &inode->i_mode, &acl);
83 if (error)
84 return error;
85 if (mode != inode->i_mode)
86 mark_inode_dirty(inode);
87 }
88
89 if (acl) {
90 len = posix_acl_to_xattr(&init_user_ns, acl, NULL, 0);
91 if (len == 0)
92 return 0;
93 data = kmalloc(len, GFP_NOFS);
94 if (data == NULL)
95 return -ENOMEM;
96 error = posix_acl_to_xattr(&init_user_ns, acl, data, len);
97 if (error < 0)
98 goto out;
99 } else {
100 data = NULL;
101 len = 0;
102 }
103
104 error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
105 if (error)
106 goto out;
107 set_cached_acl(inode, type, acl);
108 out:
109 kfree(data);
110 return error;
111 }
112