Commit | Line | Data |
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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3a8a9a10 | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
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 | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
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> | |
2646a1f6 | 15 | #include <linux/xattr.h> |
b3b94faa DT |
16 | #include <linux/posix_acl.h> |
17 | #include <linux/posix_acl_xattr.h> | |
5c676f6d | 18 | #include <linux/gfs2_ondisk.h> |
b3b94faa DT |
19 | |
20 | #include "gfs2.h" | |
5c676f6d | 21 | #include "incore.h" |
b3b94faa | 22 | #include "acl.h" |
307cf6e6 | 23 | #include "xattr.h" |
b3b94faa DT |
24 | #include "glock.h" |
25 | #include "inode.h" | |
26 | #include "meta_io.h" | |
1a39ba99 | 27 | #include "rgrp.h" |
b3b94faa | 28 | #include "trans.h" |
5c676f6d | 29 | #include "util.h" |
b3b94faa | 30 | |
479c427d | 31 | static const char *gfs2_acl_name(int type) |
b3b94faa | 32 | { |
479c427d SW |
33 | switch (type) { |
34 | case ACL_TYPE_ACCESS: | |
97d79299 | 35 | return XATTR_POSIX_ACL_ACCESS; |
479c427d | 36 | case ACL_TYPE_DEFAULT: |
97d79299 | 37 | return XATTR_POSIX_ACL_DEFAULT; |
479c427d SW |
38 | } |
39 | return NULL; | |
40 | } | |
b3b94faa | 41 | |
1a39ba99 | 42 | static struct posix_acl *__gfs2_get_acl(struct inode *inode, int type) |
479c427d | 43 | { |
018a01cd | 44 | struct gfs2_inode *ip = GFS2_I(inode); |
479c427d SW |
45 | struct posix_acl *acl; |
46 | const char *name; | |
47 | char *data; | |
48 | int len; | |
40b78a32 | 49 | |
3767ac21 | 50 | if (!ip->i_eattr) |
479c427d | 51 | return NULL; |
b3b94faa | 52 | |
479c427d | 53 | name = gfs2_acl_name(type); |
479c427d | 54 | len = gfs2_xattr_acl_get(ip, name, &data); |
1a39ba99 | 55 | if (len <= 0) |
479c427d | 56 | return ERR_PTR(len); |
5f3a4a28 | 57 | acl = posix_acl_from_xattr(&init_user_ns, data, len); |
479c427d SW |
58 | kfree(data); |
59 | return acl; | |
b3b94faa DT |
60 | } |
61 | ||
1a39ba99 AV |
62 | struct posix_acl *gfs2_get_acl(struct inode *inode, int type) |
63 | { | |
64 | struct gfs2_inode *ip = GFS2_I(inode); | |
65 | struct gfs2_holder gh; | |
66 | bool need_unlock = false; | |
67 | struct posix_acl *acl; | |
68 | ||
69 | if (!gfs2_glock_is_locked_by_me(ip->i_gl)) { | |
70 | int ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, | |
71 | LM_FLAG_ANY, &gh); | |
72 | if (ret) | |
73 | return ERR_PTR(ret); | |
74 | need_unlock = true; | |
75 | } | |
76 | acl = __gfs2_get_acl(inode, type); | |
77 | if (need_unlock) | |
78 | gfs2_glock_dq_uninit(&gh); | |
79 | return acl; | |
80 | } | |
81 | ||
82 | int __gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type) | |
b3b94faa | 83 | { |
b3b94faa | 84 | int error; |
479c427d SW |
85 | int len; |
86 | char *data; | |
87 | const char *name = gfs2_acl_name(type); | |
88 | ||
27870207 | 89 | if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode))) |
f2113eb8 | 90 | return -E2BIG; |
2646a1f6 SW |
91 | |
92 | if (type == ACL_TYPE_ACCESS) { | |
d6952123 | 93 | umode_t mode = inode->i_mode; |
e01580bf | 94 | |
2646a1f6 | 95 | error = posix_acl_equiv_mode(acl, &mode); |
e01580bf CH |
96 | if (error < 0) |
97 | return error; | |
2646a1f6 | 98 | |
e01580bf | 99 | if (error == 0) |
2646a1f6 SW |
100 | acl = NULL; |
101 | ||
733dbc1b BP |
102 | if (mode != inode->i_mode) { |
103 | inode->i_mode = mode; | |
104 | mark_inode_dirty(inode); | |
105 | } | |
2646a1f6 SW |
106 | } |
107 | ||
e01580bf CH |
108 | if (acl) { |
109 | len = posix_acl_to_xattr(&init_user_ns, acl, NULL, 0); | |
110 | if (len == 0) | |
111 | return 0; | |
112 | data = kmalloc(len, GFP_NOFS); | |
113 | if (data == NULL) | |
114 | return -ENOMEM; | |
115 | error = posix_acl_to_xattr(&init_user_ns, acl, data, len); | |
116 | if (error < 0) | |
117 | goto out; | |
118 | } else { | |
119 | data = NULL; | |
120 | len = 0; | |
106381bf | 121 | } |
e01580bf CH |
122 | |
123 | error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS); | |
124 | if (error) | |
125 | goto out; | |
932e468a | 126 | set_cached_acl(inode, type, acl); |
2646a1f6 | 127 | out: |
e01580bf | 128 | kfree(data); |
2646a1f6 SW |
129 | return error; |
130 | } | |
1a39ba99 AV |
131 | |
132 | int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type) | |
133 | { | |
134 | struct gfs2_inode *ip = GFS2_I(inode); | |
135 | struct gfs2_holder gh; | |
136 | bool need_unlock = false; | |
137 | int ret; | |
138 | ||
139 | ret = gfs2_rsqa_alloc(ip); | |
140 | if (ret) | |
141 | return ret; | |
142 | ||
143 | if (!gfs2_glock_is_locked_by_me(ip->i_gl)) { | |
144 | ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
145 | if (ret) | |
146 | return ret; | |
147 | need_unlock = true; | |
148 | } | |
149 | ret = __gfs2_set_acl(inode, acl, type); | |
150 | if (need_unlock) | |
151 | gfs2_glock_dq_uninit(&gh); | |
152 | return ret; | |
153 | } |