Commit | Line | Data |
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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" | |
d580712a | 24 | #include "quota.h" |
1a39ba99 | 25 | #include "rgrp.h" |
b3b94faa | 26 | #include "trans.h" |
5c676f6d | 27 | #include "util.h" |
b3b94faa | 28 | |
479c427d | 29 | static const char *gfs2_acl_name(int type) |
b3b94faa | 30 | { |
479c427d SW |
31 | switch (type) { |
32 | case ACL_TYPE_ACCESS: | |
97d79299 | 33 | return XATTR_POSIX_ACL_ACCESS; |
479c427d | 34 | case ACL_TYPE_DEFAULT: |
97d79299 | 35 | return XATTR_POSIX_ACL_DEFAULT; |
479c427d SW |
36 | } |
37 | return NULL; | |
38 | } | |
b3b94faa | 39 | |
1a39ba99 | 40 | static struct posix_acl *__gfs2_get_acl(struct inode *inode, int type) |
479c427d | 41 | { |
018a01cd | 42 | struct gfs2_inode *ip = GFS2_I(inode); |
479c427d SW |
43 | struct posix_acl *acl; |
44 | const char *name; | |
45 | char *data; | |
46 | int len; | |
40b78a32 | 47 | |
3767ac21 | 48 | if (!ip->i_eattr) |
479c427d | 49 | return NULL; |
b3b94faa | 50 | |
479c427d | 51 | name = gfs2_acl_name(type); |
479c427d | 52 | len = gfs2_xattr_acl_get(ip, name, &data); |
1a39ba99 | 53 | if (len <= 0) |
479c427d | 54 | return ERR_PTR(len); |
5f3a4a28 | 55 | acl = posix_acl_from_xattr(&init_user_ns, data, len); |
479c427d SW |
56 | kfree(data); |
57 | return acl; | |
b3b94faa DT |
58 | } |
59 | ||
1a39ba99 AV |
60 | struct posix_acl *gfs2_get_acl(struct inode *inode, int type) |
61 | { | |
62 | struct gfs2_inode *ip = GFS2_I(inode); | |
63 | struct gfs2_holder gh; | |
64 | bool need_unlock = false; | |
65 | struct posix_acl *acl; | |
66 | ||
67 | if (!gfs2_glock_is_locked_by_me(ip->i_gl)) { | |
68 | int ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, | |
69 | LM_FLAG_ANY, &gh); | |
70 | if (ret) | |
71 | return ERR_PTR(ret); | |
72 | need_unlock = true; | |
73 | } | |
74 | acl = __gfs2_get_acl(inode, type); | |
75 | if (need_unlock) | |
76 | gfs2_glock_dq_uninit(&gh); | |
77 | return acl; | |
78 | } | |
79 | ||
80 | int __gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type) | |
b3b94faa | 81 | { |
b3b94faa | 82 | int error; |
910f3d58 | 83 | size_t len; |
479c427d SW |
84 | char *data; |
85 | const char *name = gfs2_acl_name(type); | |
86 | ||
e01580bf | 87 | if (acl) { |
910f3d58 | 88 | len = posix_acl_xattr_size(acl->a_count); |
e01580bf CH |
89 | data = kmalloc(len, GFP_NOFS); |
90 | if (data == NULL) | |
91 | return -ENOMEM; | |
92 | error = posix_acl_to_xattr(&init_user_ns, acl, data, len); | |
93 | if (error < 0) | |
94 | goto out; | |
95 | } else { | |
96 | data = NULL; | |
97 | len = 0; | |
106381bf | 98 | } |
e01580bf CH |
99 | |
100 | error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS); | |
101 | if (error) | |
102 | goto out; | |
932e468a | 103 | set_cached_acl(inode, type, acl); |
2646a1f6 | 104 | out: |
e01580bf | 105 | kfree(data); |
2646a1f6 SW |
106 | return error; |
107 | } | |
1a39ba99 | 108 | |
549c7297 CB |
109 | int gfs2_set_acl(struct user_namespace *mnt_userns, struct inode *inode, |
110 | struct posix_acl *acl, int type) | |
1a39ba99 AV |
111 | { |
112 | struct gfs2_inode *ip = GFS2_I(inode); | |
113 | struct gfs2_holder gh; | |
114 | bool need_unlock = false; | |
115 | int ret; | |
309e8cda | 116 | umode_t mode; |
1a39ba99 | 117 | |
914cea93 JK |
118 | if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode))) |
119 | return -E2BIG; | |
120 | ||
2fba46a0 | 121 | ret = gfs2_qa_get(ip); |
1a39ba99 AV |
122 | if (ret) |
123 | return ret; | |
124 | ||
125 | if (!gfs2_glock_is_locked_by_me(ip->i_gl)) { | |
126 | ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
127 | if (ret) | |
2fba46a0 | 128 | goto out; |
1a39ba99 AV |
129 | need_unlock = true; |
130 | } | |
914cea93 | 131 | |
309e8cda EF |
132 | mode = inode->i_mode; |
133 | if (type == ACL_TYPE_ACCESS && acl) { | |
e65ce2a5 | 134 | ret = posix_acl_update_mode(&init_user_ns, inode, &mode, &acl); |
914cea93 JK |
135 | if (ret) |
136 | goto unlock; | |
914cea93 JK |
137 | } |
138 | ||
1a39ba99 | 139 | ret = __gfs2_set_acl(inode, acl, type); |
309e8cda | 140 | if (!ret && mode != inode->i_mode) { |
c2c4be28 | 141 | inode->i_ctime = current_time(inode); |
309e8cda EF |
142 | inode->i_mode = mode; |
143 | mark_inode_dirty(inode); | |
144 | } | |
914cea93 | 145 | unlock: |
1a39ba99 AV |
146 | if (need_unlock) |
147 | gfs2_glock_dq_uninit(&gh); | |
2fba46a0 BP |
148 | out: |
149 | gfs2_qa_put(ip); | |
1a39ba99 AV |
150 | return ret; |
151 | } |