2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
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>
15 #include <linux/xattr.h>
16 #include <linux/posix_acl.h>
17 #include <linux/posix_acl_xattr.h>
18 #include <linux/gfs2_ondisk.h>
30 static const char *gfs2_acl_name(int type)
34 return GFS2_POSIX_ACL_ACCESS;
35 case ACL_TYPE_DEFAULT:
36 return GFS2_POSIX_ACL_DEFAULT;
41 struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
43 struct gfs2_inode *ip = GFS2_I(inode);
44 struct posix_acl *acl;
52 acl = get_cached_acl(&ip->i_inode, type);
53 if (acl != ACL_NOT_CACHED)
56 name = gfs2_acl_name(type);
58 return ERR_PTR(-EINVAL);
60 len = gfs2_xattr_acl_get(ip, name, &data);
66 acl = posix_acl_from_xattr(data, len);
71 static int gfs2_set_mode(struct inode *inode, umode_t mode)
75 if (mode != inode->i_mode) {
78 iattr.ia_valid = ATTR_MODE;
81 error = gfs2_setattr_simple(inode, &iattr);
87 static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl)
92 const char *name = gfs2_acl_name(type);
95 len = posix_acl_to_xattr(acl, NULL, 0);
98 data = kmalloc(len, GFP_NOFS);
101 error = posix_acl_to_xattr(acl, data, len);
104 error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
106 set_cached_acl(inode, type, acl);
112 int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode)
114 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
115 struct posix_acl *acl;
116 umode_t mode = inode->i_mode;
119 if (!sdp->sd_args.ar_posix_acl)
121 if (S_ISLNK(inode->i_mode))
124 acl = gfs2_get_acl(&dip->i_inode, ACL_TYPE_DEFAULT);
128 mode &= ~current_umask();
129 if (mode != inode->i_mode)
130 error = gfs2_set_mode(inode, mode);
134 if (S_ISDIR(inode->i_mode)) {
135 error = gfs2_acl_set(inode, ACL_TYPE_DEFAULT, acl);
140 error = posix_acl_create(&acl, GFP_NOFS, &mode);
147 error = gfs2_acl_set(inode, ACL_TYPE_ACCESS, acl);
151 error = gfs2_set_mode(inode, mode);
153 posix_acl_release(acl);
157 int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr)
159 struct inode *inode = &ip->i_inode;
160 struct posix_acl *acl;
165 acl = gfs2_get_acl(&ip->i_inode, ACL_TYPE_ACCESS);
169 return gfs2_setattr_simple(inode, attr);
171 error = posix_acl_chmod(&acl, GFP_NOFS, attr->ia_mode);
175 len = posix_acl_to_xattr(acl, NULL, 0);
176 data = kmalloc(len, GFP_NOFS);
180 posix_acl_to_xattr(acl, data, len);
181 error = gfs2_xattr_acl_chmod(ip, attr, data);
183 set_cached_acl(&ip->i_inode, ACL_TYPE_ACCESS, acl);
186 posix_acl_release(acl);
190 static int gfs2_acl_type(const char *name)
192 if (strcmp(name, GFS2_POSIX_ACL_ACCESS) == 0)
193 return ACL_TYPE_ACCESS;
194 if (strcmp(name, GFS2_POSIX_ACL_DEFAULT) == 0)
195 return ACL_TYPE_DEFAULT;
199 static int gfs2_xattr_system_get(struct dentry *dentry, const char *name,
200 void *buffer, size_t size, int xtype)
202 struct inode *inode = dentry->d_inode;
203 struct gfs2_sbd *sdp = GFS2_SB(inode);
204 struct posix_acl *acl;
208 if (!sdp->sd_args.ar_posix_acl)
211 type = gfs2_acl_type(name);
215 acl = gfs2_get_acl(inode, type);
221 error = posix_acl_to_xattr(acl, buffer, size);
222 posix_acl_release(acl);
227 static int gfs2_xattr_system_set(struct dentry *dentry, const char *name,
228 const void *value, size_t size, int flags,
231 struct inode *inode = dentry->d_inode;
232 struct gfs2_sbd *sdp = GFS2_SB(inode);
233 struct posix_acl *acl = NULL;
236 if (!sdp->sd_args.ar_posix_acl)
239 type = gfs2_acl_type(name);
242 if (flags & XATTR_CREATE)
244 if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
245 return value ? -EACCES : 0;
246 if ((current_fsuid() != inode->i_uid) && !capable(CAP_FOWNER))
248 if (S_ISLNK(inode->i_mode))
254 acl = posix_acl_from_xattr(value, size);
257 * acl_set_file(3) may request that we set default ACLs with
258 * zero length -- defend (gracefully) against that here.
263 error = PTR_ERR(acl);
267 error = posix_acl_valid(acl);
272 if (acl->a_count > GFS2_ACL_MAX_ENTRIES)
275 if (type == ACL_TYPE_ACCESS) {
276 umode_t mode = inode->i_mode;
277 error = posix_acl_equiv_mode(acl, &mode);
280 posix_acl_release(acl);
287 error = gfs2_set_mode(inode, mode);
293 error = __gfs2_xattr_set(inode, name, value, size, 0, GFS2_EATYPE_SYS);
296 set_cached_acl(inode, type, acl);
298 forget_cached_acl(inode, type);
301 posix_acl_release(acl);
306 const struct xattr_handler gfs2_xattr_system_handler = {
307 .prefix = XATTR_SYSTEM_PREFIX,
308 .flags = GFS2_EATYPE_SYS,
309 .get = gfs2_xattr_system_get,
310 .set = gfs2_xattr_system_set,