2 * Copyright (C) International Business Machines Corp., 2002-2004
3 * Copyright (C) Andreas Gruenbacher, 2001
4 * Copyright (C) Linus Torvalds, 1991, 1992
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
14 * the GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <linux/sched.h>
23 #include <linux/namei.h>
24 #include <linux/quotaops.h>
25 #include "jfs_incore.h"
26 #include "jfs_xattr.h"
29 static struct posix_acl *jfs_get_acl(struct inode *inode, int type)
31 struct posix_acl *acl;
33 struct jfs_inode_info *ji = JFS_IP(inode);
34 struct posix_acl **p_acl;
40 ea_name = XATTR_NAME_ACL_ACCESS;
43 case ACL_TYPE_DEFAULT:
44 ea_name = XATTR_NAME_ACL_DEFAULT;
45 p_acl = &ji->i_default_acl;
48 return ERR_PTR(-EINVAL);
51 if (*p_acl != JFS_ACL_NOT_CACHED)
52 return posix_acl_dup(*p_acl);
54 size = __jfs_getxattr(inode, ea_name, NULL, 0);
57 value = kmalloc(size, GFP_KERNEL);
59 return ERR_PTR(-ENOMEM);
60 size = __jfs_getxattr(inode, ea_name, value, size);
64 if (size == -ENODATA) {
70 acl = posix_acl_from_xattr(value, size);
72 *p_acl = posix_acl_dup(acl);
79 static int jfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
82 struct jfs_inode_info *ji = JFS_IP(inode);
83 struct posix_acl **p_acl;
88 if (S_ISLNK(inode->i_mode))
93 ea_name = XATTR_NAME_ACL_ACCESS;
96 case ACL_TYPE_DEFAULT:
97 ea_name = XATTR_NAME_ACL_DEFAULT;
98 p_acl = &ji->i_default_acl;
99 if (!S_ISDIR(inode->i_mode))
100 return acl ? -EACCES : 0;
106 size = xattr_acl_size(acl->a_count);
107 value = kmalloc(size, GFP_KERNEL);
110 rc = posix_acl_to_xattr(acl, value, size);
114 rc = __jfs_setxattr(inode, ea_name, value, size, 0);
120 if (*p_acl && (*p_acl != JFS_ACL_NOT_CACHED))
121 posix_acl_release(*p_acl);
122 *p_acl = posix_acl_dup(acl);
127 int jfs_permission(struct inode *inode, int mask, struct nameidata *nd)
129 int mode = inode->i_mode;
131 #warning MEF Need new BME patch for 2.6.10
132 /* Nobody gets write access to a read-only fs */
133 if ((mask & MAY_WRITE) && (IS_RDONLY(inode) ||
134 (nd && MNT_IS_RDONLY(nd->mnt))) &&
135 (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)))
138 return generic_permission(inode, mask, 0);
141 int jfs_init_acl(struct inode *inode, struct inode *dir)
143 struct posix_acl *acl = NULL;
144 struct posix_acl *clone;
148 if (S_ISLNK(inode->i_mode))
151 acl = jfs_get_acl(dir, ACL_TYPE_DEFAULT);
156 if (S_ISDIR(inode->i_mode)) {
157 rc = jfs_set_acl(inode, ACL_TYPE_DEFAULT, acl);
161 clone = posix_acl_clone(acl, GFP_KERNEL);
166 mode = inode->i_mode;
167 rc = posix_acl_create_masq(clone, &mode);
169 inode->i_mode = mode;
171 rc = jfs_set_acl(inode, ACL_TYPE_ACCESS, clone);
173 posix_acl_release(clone);
175 posix_acl_release(acl);
177 inode->i_mode &= ~current->fs->umask;
182 static int jfs_acl_chmod(struct inode *inode)
184 struct posix_acl *acl, *clone;
187 if (S_ISLNK(inode->i_mode))
190 acl = jfs_get_acl(inode, ACL_TYPE_ACCESS);
191 if (IS_ERR(acl) || !acl)
194 clone = posix_acl_clone(acl, GFP_KERNEL);
195 posix_acl_release(acl);
199 rc = posix_acl_chmod_masq(clone, inode->i_mode);
201 rc = jfs_set_acl(inode, ACL_TYPE_ACCESS, clone);
203 posix_acl_release(clone);
207 int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
209 struct inode *inode = dentry->d_inode;
212 rc = inode_change_ok(inode, iattr);
216 if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) ||
217 (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {
218 if (DQUOT_TRANSFER(inode, iattr))
222 rc = inode_setattr(inode, iattr);
224 if (!rc && (iattr->ia_valid & ATTR_MODE))
225 rc = jfs_acl_chmod(inode);