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/posix_acl.h>
16 #include <linux/posix_acl_xattr.h>
17 #include <linux/gfs2_ondisk.h>
18 #include <linux/lm_interface.h>
34 int gfs2_acl_validate_set(struct gfs2_inode *ip, int access,
35 struct gfs2_ea_request *er,
36 int *remove, mode_t *mode)
38 struct posix_acl *acl;
41 error = gfs2_acl_validate_remove(ip, access);
48 acl = posix_acl_from_xattr(er->er_data, er->er_data_len);
56 error = posix_acl_valid(acl);
61 error = posix_acl_equiv_mode(acl, mode);
69 posix_acl_release(acl);
73 int gfs2_acl_validate_remove(struct gfs2_inode *ip, int access)
75 if (!GFS2_SB(&ip->i_inode)->sd_args.ar_posix_acl)
77 if (!is_owner_or_cap(&ip->i_inode))
79 if (S_ISLNK(ip->i_inode.i_mode))
81 if (!access && !S_ISDIR(ip->i_inode.i_mode))
87 static int acl_get(struct gfs2_inode *ip, int access, struct posix_acl **acl,
88 struct gfs2_ea_location *el, char **data, unsigned int *len)
90 struct gfs2_ea_request er;
91 struct gfs2_ea_location el_this;
97 memset(&er, 0, sizeof(struct gfs2_ea_request));
99 er.er_name = GFS2_POSIX_ACL_ACCESS;
100 er.er_name_len = GFS2_POSIX_ACL_ACCESS_LEN;
102 er.er_name = GFS2_POSIX_ACL_DEFAULT;
103 er.er_name_len = GFS2_POSIX_ACL_DEFAULT_LEN;
105 er.er_type = GFS2_EATYPE_SYS;
110 error = gfs2_ea_find(ip, &er, el);
115 if (!GFS2_EA_DATA_LEN(el->el_ea))
118 er.er_data_len = GFS2_EA_DATA_LEN(el->el_ea);
119 er.er_data = kmalloc(er.er_data_len, GFP_NOFS);
124 error = gfs2_ea_get_copy(ip, el, er.er_data);
129 *acl = posix_acl_from_xattr(er.er_data, er.er_data_len);
131 error = PTR_ERR(*acl);
139 *len = er.er_data_len;
142 if (error || el == &el_this)
148 * gfs2_check_acl - Check an ACL to see if we're allowed to do something
149 * @inode: the file we want to do something to
150 * @mask: what we want to do
155 int gfs2_check_acl(struct inode *inode, int mask)
157 struct posix_acl *acl = NULL;
160 error = acl_get(GFS2_I(inode), ACL_ACCESS, &acl, NULL, NULL, NULL);
165 error = posix_acl_permission(inode, acl, mask);
166 posix_acl_release(acl);
173 static int munge_mode(struct gfs2_inode *ip, mode_t mode)
175 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
176 struct buffer_head *dibh;
179 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
183 error = gfs2_meta_inode_buffer(ip, &dibh);
185 gfs2_assert_withdraw(sdp,
186 (ip->i_inode.i_mode & S_IFMT) == (mode & S_IFMT));
187 ip->i_inode.i_mode = mode;
188 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
189 gfs2_dinode_out(ip, dibh->b_data);
198 int gfs2_acl_create(struct gfs2_inode *dip, struct gfs2_inode *ip)
200 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
201 struct posix_acl *acl = NULL, *clone;
202 struct gfs2_ea_request er;
203 mode_t mode = ip->i_inode.i_mode;
206 if (!sdp->sd_args.ar_posix_acl)
208 if (S_ISLNK(ip->i_inode.i_mode))
211 memset(&er, 0, sizeof(struct gfs2_ea_request));
212 er.er_type = GFS2_EATYPE_SYS;
214 error = acl_get(dip, ACL_DEFAULT, &acl, NULL,
215 &er.er_data, &er.er_data_len);
219 mode &= ~current->fs->umask;
220 if (mode != ip->i_inode.i_mode)
221 error = munge_mode(ip, mode);
225 clone = posix_acl_clone(acl, GFP_NOFS);
229 posix_acl_release(acl);
232 if (S_ISDIR(ip->i_inode.i_mode)) {
233 er.er_name = GFS2_POSIX_ACL_DEFAULT;
234 er.er_name_len = GFS2_POSIX_ACL_DEFAULT_LEN;
235 error = gfs2_system_eaops.eo_set(ip, &er);
240 error = posix_acl_create_masq(acl, &mode);
244 er.er_name = GFS2_POSIX_ACL_ACCESS;
245 er.er_name_len = GFS2_POSIX_ACL_ACCESS_LEN;
246 posix_acl_to_xattr(acl, er.er_data, er.er_data_len);
248 er.er_flags = GFS2_ERF_MODE;
249 error = gfs2_system_eaops.eo_set(ip, &er);
253 munge_mode(ip, mode);
256 posix_acl_release(acl);
261 int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr)
263 struct posix_acl *acl = NULL, *clone;
264 struct gfs2_ea_location el;
269 error = acl_get(ip, ACL_ACCESS, &acl, &el, &data, &len);
273 return gfs2_setattr_simple(ip, attr);
275 clone = posix_acl_clone(acl, GFP_NOFS);
279 posix_acl_release(acl);
282 error = posix_acl_chmod_masq(acl, attr->ia_mode);
284 posix_acl_to_xattr(acl, data, len);
285 error = gfs2_ea_acl_chmod(ip, &el, attr, data);
289 posix_acl_release(acl);