1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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>
29 static const char *gfs2_acl_name(int type)
33 return XATTR_POSIX_ACL_ACCESS;
34 case ACL_TYPE_DEFAULT:
35 return XATTR_POSIX_ACL_DEFAULT;
40 static struct posix_acl *__gfs2_get_acl(struct inode *inode, int type)
42 struct gfs2_inode *ip = GFS2_I(inode);
43 struct posix_acl *acl;
51 name = gfs2_acl_name(type);
52 len = gfs2_xattr_acl_get(ip, name, &data);
55 acl = posix_acl_from_xattr(&init_user_ns, data, len);
60 struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
62 struct gfs2_inode *ip = GFS2_I(inode);
63 struct gfs2_holder gh;
64 bool need_unlock = false;
65 struct posix_acl *acl;
67 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
68 int ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
74 acl = __gfs2_get_acl(inode, type);
76 gfs2_glock_dq_uninit(&gh);
80 int __gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
85 const char *name = gfs2_acl_name(type);
88 len = posix_acl_xattr_size(acl->a_count);
89 data = kmalloc(len, GFP_NOFS);
92 error = posix_acl_to_xattr(&init_user_ns, acl, data, len);
100 error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
103 set_cached_acl(inode, type, acl);
109 int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
111 struct gfs2_inode *ip = GFS2_I(inode);
112 struct gfs2_holder gh;
113 bool need_unlock = false;
117 if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
120 ret = gfs2_qa_get(ip);
124 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
125 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
131 mode = inode->i_mode;
132 if (type == ACL_TYPE_ACCESS && acl) {
133 ret = posix_acl_update_mode(inode, &mode, &acl);
138 ret = __gfs2_set_acl(inode, acl, type);
139 if (!ret && mode != inode->i_mode) {
140 inode->i_ctime = current_time(inode);
141 inode->i_mode = mode;
142 mark_inode_dirty(inode);
146 gfs2_glock_dq_uninit(&gh);