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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>
12#include <linux/xattr.h>
13#include <linux/posix_acl.h>
14#include <linux/posix_acl_xattr.h>
15#include <linux/gfs2_ondisk.h>
16
17#include "gfs2.h"
18#include "incore.h"
19#include "acl.h"
20#include "xattr.h"
21#include "glock.h"
22#include "inode.h"
23#include "meta_io.h"
24#include "quota.h"
25#include "rgrp.h"
26#include "trans.h"
27#include "util.h"
28
29static const char *gfs2_acl_name(int type)
30{
31 switch (type) {
32 case ACL_TYPE_ACCESS:
33 return XATTR_POSIX_ACL_ACCESS;
34 case ACL_TYPE_DEFAULT:
35 return XATTR_POSIX_ACL_DEFAULT;
36 }
37 return NULL;
38}
39
40static struct posix_acl *__gfs2_get_acl(struct inode *inode, int type)
41{
42 struct gfs2_inode *ip = GFS2_I(inode);
43 struct posix_acl *acl;
44 const char *name;
45 char *data;
46 int len;
47
48 if (!ip->i_eattr)
49 return NULL;
50
51 name = gfs2_acl_name(type);
52 len = gfs2_xattr_acl_get(ip, name, &data);
53 if (len <= 0)
54 return ERR_PTR(len);
55 acl = posix_acl_from_xattr(&init_user_ns, data, len);
56 kfree(data);
57 return acl;
58}
59
60struct 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
80int __gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
81{
82 int error;
83 size_t len;
84 char *data;
85 const char *name = gfs2_acl_name(type);
86
87 if (acl) {
88 len = posix_acl_xattr_size(acl->a_count);
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;
98 }
99
100 error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
101 if (error)
102 goto out;
103 set_cached_acl(inode, type, acl);
104out:
105 kfree(data);
106 return error;
107}
108
109int gfs2_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
110 struct posix_acl *acl, int type)
111{
112 struct gfs2_inode *ip = GFS2_I(inode);
113 struct gfs2_holder gh;
114 bool need_unlock = false;
115 int ret;
116 umode_t mode;
117
118 if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
119 return -E2BIG;
120
121 ret = gfs2_qa_get(ip);
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)
128 goto out;
129 need_unlock = true;
130 }
131
132 mode = inode->i_mode;
133 if (type == ACL_TYPE_ACCESS && acl) {
134 ret = posix_acl_update_mode(&init_user_ns, inode, &mode, &acl);
135 if (ret)
136 goto unlock;
137 }
138
139 ret = __gfs2_set_acl(inode, acl, type);
140 if (!ret && mode != inode->i_mode) {
141 inode->i_ctime = current_time(inode);
142 inode->i_mode = mode;
143 mark_inode_dirty(inode);
144 }
145unlock:
146 if (need_unlock)
147 gfs2_glock_dq_uninit(&gh);
148out:
149 gfs2_qa_put(ip);
150 return ret;
151}
152
