Commit | Line | Data |
---|---|---|
7336d0e6 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
b3b94faa DT |
2 | /* |
3 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3a8a9a10 | 4 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
5 | */ |
6 | ||
7 | #include <linux/sched.h> | |
8 | #include <linux/slab.h> | |
9 | #include <linux/spinlock.h> | |
10 | #include <linux/completion.h> | |
11 | #include <linux/buffer_head.h> | |
2646a1f6 | 12 | #include <linux/xattr.h> |
b3b94faa DT |
13 | #include <linux/posix_acl.h> |
14 | #include <linux/posix_acl_xattr.h> | |
5c676f6d | 15 | #include <linux/gfs2_ondisk.h> |
b3b94faa DT |
16 | |
17 | #include "gfs2.h" | |
5c676f6d | 18 | #include "incore.h" |
b3b94faa | 19 | #include "acl.h" |
307cf6e6 | 20 | #include "xattr.h" |
b3b94faa DT |
21 | #include "glock.h" |
22 | #include "inode.h" | |
23 | #include "meta_io.h" | |
1a39ba99 | 24 | #include "rgrp.h" |
b3b94faa | 25 | #include "trans.h" |
5c676f6d | 26 | #include "util.h" |
b3b94faa | 27 | |
479c427d | 28 | static const char *gfs2_acl_name(int type) |
b3b94faa | 29 | { |
479c427d SW |
30 | switch (type) { |
31 | case ACL_TYPE_ACCESS: | |
97d79299 | 32 | return XATTR_POSIX_ACL_ACCESS; |
479c427d | 33 | case ACL_TYPE_DEFAULT: |
97d79299 | 34 | return XATTR_POSIX_ACL_DEFAULT; |
479c427d SW |
35 | } |
36 | return NULL; | |
37 | } | |
b3b94faa | 38 | |
1a39ba99 | 39 | static struct posix_acl *__gfs2_get_acl(struct inode *inode, int type) |
479c427d | 40 | { |
018a01cd | 41 | struct gfs2_inode *ip = GFS2_I(inode); |
479c427d SW |
42 | struct posix_acl *acl; |
43 | const char *name; | |
44 | char *data; | |
45 | int len; | |
40b78a32 | 46 | |
3767ac21 | 47 | if (!ip->i_eattr) |
479c427d | 48 | return NULL; |
b3b94faa | 49 | |
479c427d | 50 | name = gfs2_acl_name(type); |
479c427d | 51 | len = gfs2_xattr_acl_get(ip, name, &data); |
1a39ba99 | 52 | if (len <= 0) |
479c427d | 53 | return ERR_PTR(len); |
5f3a4a28 | 54 | acl = posix_acl_from_xattr(&init_user_ns, data, len); |
479c427d SW |
55 | kfree(data); |
56 | return acl; | |
b3b94faa DT |
57 | } |
58 | ||
1a39ba99 AV |
59 | struct posix_acl *gfs2_get_acl(struct inode *inode, int type) |
60 | { | |
61 | struct gfs2_inode *ip = GFS2_I(inode); | |
62 | struct gfs2_holder gh; | |
63 | bool need_unlock = false; | |
64 | struct posix_acl *acl; | |
65 | ||
66 | if (!gfs2_glock_is_locked_by_me(ip->i_gl)) { | |
67 | int ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, | |
68 | LM_FLAG_ANY, &gh); | |
69 | if (ret) | |
70 | return ERR_PTR(ret); | |
71 | need_unlock = true; | |
72 | } | |
73 | acl = __gfs2_get_acl(inode, type); | |
74 | if (need_unlock) | |
75 | gfs2_glock_dq_uninit(&gh); | |
76 | return acl; | |
77 | } | |
78 | ||
79 | int __gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type) | |
b3b94faa | 80 | { |
b3b94faa | 81 | int error; |
910f3d58 | 82 | size_t len; |
479c427d SW |
83 | char *data; |
84 | const char *name = gfs2_acl_name(type); | |
85 | ||
e01580bf | 86 | if (acl) { |
910f3d58 | 87 | len = posix_acl_xattr_size(acl->a_count); |
e01580bf CH |
88 | data = kmalloc(len, GFP_NOFS); |
89 | if (data == NULL) | |
90 | return -ENOMEM; | |
91 | error = posix_acl_to_xattr(&init_user_ns, acl, data, len); | |
92 | if (error < 0) | |
93 | goto out; | |
94 | } else { | |
95 | data = NULL; | |
96 | len = 0; | |
106381bf | 97 | } |
e01580bf CH |
98 | |
99 | error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS); | |
100 | if (error) | |
101 | goto out; | |
932e468a | 102 | set_cached_acl(inode, type, acl); |
2646a1f6 | 103 | out: |
e01580bf | 104 | kfree(data); |
2646a1f6 SW |
105 | return error; |
106 | } | |
1a39ba99 AV |
107 | |
108 | int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type) | |
109 | { | |
110 | struct gfs2_inode *ip = GFS2_I(inode); | |
111 | struct gfs2_holder gh; | |
112 | bool need_unlock = false; | |
113 | int ret; | |
309e8cda | 114 | umode_t mode; |
1a39ba99 | 115 | |
914cea93 JK |
116 | if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode))) |
117 | return -E2BIG; | |
118 | ||
1a39ba99 AV |
119 | ret = gfs2_rsqa_alloc(ip); |
120 | if (ret) | |
121 | return ret; | |
122 | ||
123 | if (!gfs2_glock_is_locked_by_me(ip->i_gl)) { | |
124 | ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
125 | if (ret) | |
126 | return ret; | |
127 | need_unlock = true; | |
128 | } | |
914cea93 | 129 | |
309e8cda EF |
130 | mode = inode->i_mode; |
131 | if (type == ACL_TYPE_ACCESS && acl) { | |
132 | ret = posix_acl_update_mode(inode, &mode, &acl); | |
914cea93 JK |
133 | if (ret) |
134 | goto unlock; | |
914cea93 JK |
135 | } |
136 | ||
1a39ba99 | 137 | ret = __gfs2_set_acl(inode, acl, type); |
309e8cda | 138 | if (!ret && mode != inode->i_mode) { |
c2c4be28 | 139 | inode->i_ctime = current_time(inode); |
309e8cda EF |
140 | inode->i_mode = mode; |
141 | mark_inode_dirty(inode); | |
142 | } | |
914cea93 | 143 | unlock: |
1a39ba99 AV |
144 | if (need_unlock) |
145 | gfs2_glock_dq_uninit(&gh); | |
146 | return ret; | |
147 | } |