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 static struct posix_acl *gfs2_acl_get(struct gfs2_inode *ip, int type)
43 struct posix_acl *acl;
51 acl = get_cached_acl(&ip->i_inode, type);
52 if (acl != ACL_NOT_CACHED)
55 name = gfs2_acl_name(type);
57 return ERR_PTR(-EINVAL);
59 len = gfs2_xattr_acl_get(ip, name, &data);
65 acl = posix_acl_from_xattr(data, len);
70 struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
72 return gfs2_acl_get(GFS2_I(inode), type);
75 static int gfs2_set_mode(struct inode *inode, umode_t mode)
79 if (mode != inode->i_mode) {
82 iattr.ia_valid = ATTR_MODE;
85 error = gfs2_setattr_simple(GFS2_I(inode), &iattr);
91 static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl)
96 const char *name = gfs2_acl_name(type);
99 len = posix_acl_to_xattr(acl, NULL, 0);
102 data = kmalloc(len, GFP_NOFS);
105 error = posix_acl_to_xattr(acl, data, len);
108 error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
110 set_cached_acl(inode, type, acl);
116 int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode)
118 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
119 struct posix_acl *acl;
120 umode_t mode = inode->i_mode;
123 if (!sdp->sd_args.ar_posix_acl)
125 if (S_ISLNK(inode->i_mode))
128 acl = gfs2_acl_get(dip, ACL_TYPE_DEFAULT);
132 mode &= ~current_umask();
133 if (mode != inode->i_mode)
134 error = gfs2_set_mode(inode, mode);
138 if (S_ISDIR(inode->i_mode)) {
139 error = gfs2_acl_set(inode, ACL_TYPE_DEFAULT, acl);
144 error = posix_acl_create(&acl, GFP_NOFS, &mode);
151 error = gfs2_acl_set(inode, ACL_TYPE_ACCESS, acl);
155 error = gfs2_set_mode(inode, mode);
157 posix_acl_release(acl);
161 int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr)
163 struct posix_acl *acl;
168 acl = gfs2_acl_get(ip, ACL_TYPE_ACCESS);
172 return gfs2_setattr_simple(ip, attr);
174 error = posix_acl_chmod(&acl, GFP_NOFS, attr->ia_mode);
178 len = posix_acl_to_xattr(acl, NULL, 0);
179 data = kmalloc(len, GFP_NOFS);
183 posix_acl_to_xattr(acl, data, len);
184 error = gfs2_xattr_acl_chmod(ip, attr, data);
186 set_cached_acl(&ip->i_inode, ACL_TYPE_ACCESS, acl);
189 posix_acl_release(acl);
193 static int gfs2_acl_type(const char *name)
195 if (strcmp(name, GFS2_POSIX_ACL_ACCESS) == 0)
196 return ACL_TYPE_ACCESS;
197 if (strcmp(name, GFS2_POSIX_ACL_DEFAULT) == 0)
198 return ACL_TYPE_DEFAULT;
202 static int gfs2_xattr_system_get(struct dentry *dentry, const char *name,
203 void *buffer, size_t size, int xtype)
205 struct inode *inode = dentry->d_inode;
206 struct gfs2_sbd *sdp = GFS2_SB(inode);
207 struct posix_acl *acl;
211 if (!sdp->sd_args.ar_posix_acl)
214 type = gfs2_acl_type(name);
218 acl = gfs2_acl_get(GFS2_I(inode), type);
224 error = posix_acl_to_xattr(acl, buffer, size);
225 posix_acl_release(acl);
230 static int gfs2_xattr_system_set(struct dentry *dentry, const char *name,
231 const void *value, size_t size, int flags,
234 struct inode *inode = dentry->d_inode;
235 struct gfs2_sbd *sdp = GFS2_SB(inode);
236 struct posix_acl *acl = NULL;
239 if (!sdp->sd_args.ar_posix_acl)
242 type = gfs2_acl_type(name);
245 if (flags & XATTR_CREATE)
247 if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
248 return value ? -EACCES : 0;
249 if ((current_fsuid() != inode->i_uid) && !capable(CAP_FOWNER))
251 if (S_ISLNK(inode->i_mode))
257 acl = posix_acl_from_xattr(value, size);
260 * acl_set_file(3) may request that we set default ACLs with
261 * zero length -- defend (gracefully) against that here.
266 error = PTR_ERR(acl);
270 error = posix_acl_valid(acl);
275 if (acl->a_count > GFS2_ACL_MAX_ENTRIES)
278 if (type == ACL_TYPE_ACCESS) {
279 umode_t mode = inode->i_mode;
280 error = posix_acl_equiv_mode(acl, &mode);
283 posix_acl_release(acl);
290 error = gfs2_set_mode(inode, mode);
296 error = __gfs2_xattr_set(inode, name, value, size, 0, GFS2_EATYPE_SYS);
299 set_cached_acl(inode, type, acl);
301 forget_cached_acl(inode, type);
304 posix_acl_release(acl);
309 const struct xattr_handler gfs2_xattr_system_handler = {
310 .prefix = XATTR_SYSTEM_PREFIX,
311 .flags = GFS2_EATYPE_SYS,
312 .get = gfs2_xattr_system_get,
313 .set = gfs2_xattr_system_set,