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Christoph Hellwigef14f0c2009-06-10 17:07:47 +02001/*
2 * Copyright (c) 2008, Christoph Hellwig
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18#include "xfs.h"
Dave Chinnera4fbe6a2013-10-23 10:51:50 +110019#include "xfs_format.h"
Dave Chinner69432832013-08-12 20:49:23 +100020#include "xfs_log_format.h"
Dave Chinner7fd36c42013-08-12 20:49:32 +100021#include "xfs_trans_resv.h"
Dave Chinner0a8aa192013-06-05 12:09:10 +100022#include "xfs_mount.h"
Dave Chinnera4fbe6a2013-10-23 10:51:50 +110023#include "xfs_inode.h"
24#include "xfs_acl.h"
25#include "xfs_attr.h"
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000026#include "xfs_trace.h"
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090027#include <linux/slab.h>
Christoph Hellwigef14f0c2009-06-10 17:07:47 +020028#include <linux/xattr.h>
29#include <linux/posix_acl_xattr.h>
30
31
Christoph Hellwigef14f0c2009-06-10 17:07:47 +020032/*
33 * Locking scheme:
34 * - all ACL updates are protected by inode->i_mutex, which is taken before
35 * calling into this file.
Christoph Hellwigef14f0c2009-06-10 17:07:47 +020036 */
37
38STATIC struct posix_acl *
Dave Chinner0a8aa192013-06-05 12:09:10 +100039xfs_acl_from_disk(
Andreas Gruenbacher86a21c72015-11-03 12:41:59 +110040 const struct xfs_acl *aclp,
41 int len,
42 int max_entries)
Christoph Hellwigef14f0c2009-06-10 17:07:47 +020043{
44 struct posix_acl_entry *acl_e;
45 struct posix_acl *acl;
Andreas Gruenbacher86a21c72015-11-03 12:41:59 +110046 const struct xfs_acl_entry *ace;
Xi Wang093019c2011-12-12 21:55:52 +000047 unsigned int count, i;
Christoph Hellwigef14f0c2009-06-10 17:07:47 +020048
Andreas Gruenbacher86a21c72015-11-03 12:41:59 +110049 if (len < sizeof(*aclp))
50 return ERR_PTR(-EFSCORRUPTED);
Christoph Hellwigef14f0c2009-06-10 17:07:47 +020051 count = be32_to_cpu(aclp->acl_cnt);
Andreas Gruenbacher86a21c72015-11-03 12:41:59 +110052 if (count > max_entries || XFS_ACL_SIZE(count) != len)
Christoph Hellwigfa8b18e2011-11-20 15:35:32 +000053 return ERR_PTR(-EFSCORRUPTED);
Christoph Hellwigef14f0c2009-06-10 17:07:47 +020054
55 acl = posix_acl_alloc(count, GFP_KERNEL);
56 if (!acl)
57 return ERR_PTR(-ENOMEM);
58
59 for (i = 0; i < count; i++) {
60 acl_e = &acl->a_entries[i];
61 ace = &aclp->acl_entry[i];
62
63 /*
64 * The tag is 32 bits on disk and 16 bits in core.
65 *
66 * Because every access to it goes through the core
67 * format first this is not a problem.
68 */
69 acl_e->e_tag = be32_to_cpu(ace->ae_tag);
70 acl_e->e_perm = be16_to_cpu(ace->ae_perm);
71
72 switch (acl_e->e_tag) {
73 case ACL_USER:
Dwight Engen288bbe02013-08-15 14:07:59 -040074 acl_e->e_uid = xfs_uid_to_kuid(be32_to_cpu(ace->ae_id));
75 break;
Christoph Hellwigef14f0c2009-06-10 17:07:47 +020076 case ACL_GROUP:
Dwight Engen288bbe02013-08-15 14:07:59 -040077 acl_e->e_gid = xfs_gid_to_kgid(be32_to_cpu(ace->ae_id));
Christoph Hellwigef14f0c2009-06-10 17:07:47 +020078 break;
79 case ACL_USER_OBJ:
80 case ACL_GROUP_OBJ:
81 case ACL_MASK:
82 case ACL_OTHER:
Christoph Hellwigef14f0c2009-06-10 17:07:47 +020083 break;
84 default:
85 goto fail;
86 }
87 }
88 return acl;
89
90fail:
91 posix_acl_release(acl);
92 return ERR_PTR(-EINVAL);
93}
94
95STATIC void
96xfs_acl_to_disk(struct xfs_acl *aclp, const struct posix_acl *acl)
97{
98 const struct posix_acl_entry *acl_e;
99 struct xfs_acl_entry *ace;
100 int i;
101
102 aclp->acl_cnt = cpu_to_be32(acl->a_count);
103 for (i = 0; i < acl->a_count; i++) {
104 ace = &aclp->acl_entry[i];
105 acl_e = &acl->a_entries[i];
106
107 ace->ae_tag = cpu_to_be32(acl_e->e_tag);
Dwight Engen288bbe02013-08-15 14:07:59 -0400108 switch (acl_e->e_tag) {
109 case ACL_USER:
110 ace->ae_id = cpu_to_be32(xfs_kuid_to_uid(acl_e->e_uid));
111 break;
112 case ACL_GROUP:
113 ace->ae_id = cpu_to_be32(xfs_kgid_to_gid(acl_e->e_gid));
114 break;
115 default:
116 ace->ae_id = cpu_to_be32(ACL_UNDEFINED_ID);
117 break;
118 }
119
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200120 ace->ae_perm = cpu_to_be16(acl_e->e_perm);
121 }
122}
123
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200124struct posix_acl *
125xfs_get_acl(struct inode *inode, int type)
126{
127 struct xfs_inode *ip = XFS_I(inode);
Christoph Hellwig2401dc22013-12-20 05:16:50 -0800128 struct posix_acl *acl = NULL;
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200129 struct xfs_acl *xfs_acl;
Dave Chinnera9273ca2010-01-20 10:47:48 +1100130 unsigned char *ea_name;
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200131 int error;
Dave Chinner0a8aa192013-06-05 12:09:10 +1000132 int len;
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200133
Christoph Hellwig4e34e712011-07-23 17:37:31 +0200134 trace_xfs_get_acl(ip);
135
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200136 switch (type) {
137 case ACL_TYPE_ACCESS:
138 ea_name = SGI_ACL_FILE;
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200139 break;
140 case ACL_TYPE_DEFAULT:
141 ea_name = SGI_ACL_DEFAULT;
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200142 break;
143 default:
Al Viro1cbd20d2009-06-09 13:29:39 -0400144 BUG();
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200145 }
146
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200147 /*
148 * If we have a cached ACLs value just return it, not need to
149 * go out to the disk.
150 */
Dave Chinner0a8aa192013-06-05 12:09:10 +1000151 len = XFS_ACL_MAX_SIZE(ip->i_mount);
Dave Chinnerfdd3cce2013-09-02 20:53:00 +1000152 xfs_acl = kmem_zalloc_large(len, KM_SLEEP);
153 if (!xfs_acl)
154 return ERR_PTR(-ENOMEM);
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200155
Dave Chinner24513372014-06-25 14:58:08 +1000156 error = xfs_attr_get(ip, ea_name, (unsigned char *)xfs_acl,
Dave Chinnera9273ca2010-01-20 10:47:48 +1100157 &len, ATTR_ROOT);
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200158 if (error) {
159 /*
160 * If the attribute doesn't exist make sure we have a negative
Andreas Gruenbacherb8a7a3a2016-03-24 14:38:37 +0100161 * cache entry, for any other error assume it is transient.
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200162 */
Andreas Gruenbacherb8a7a3a2016-03-24 14:38:37 +0100163 if (error != -ENOATTR)
164 acl = ERR_PTR(error);
165 } else {
166 acl = xfs_acl_from_disk(xfs_acl, len,
167 XFS_ACL_MAX_ENTRIES(ip->i_mount));
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200168 }
Dave Chinnerfdd3cce2013-09-02 20:53:00 +1000169 kmem_free(xfs_acl);
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200170 return acl;
171}
172
173STATIC int
Christoph Hellwig2401dc22013-12-20 05:16:50 -0800174__xfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200175{
176 struct xfs_inode *ip = XFS_I(inode);
Dave Chinnera9273ca2010-01-20 10:47:48 +1100177 unsigned char *ea_name;
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200178 int error;
179
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200180 switch (type) {
181 case ACL_TYPE_ACCESS:
182 ea_name = SGI_ACL_FILE;
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200183 break;
184 case ACL_TYPE_DEFAULT:
185 if (!S_ISDIR(inode->i_mode))
186 return acl ? -EACCES : 0;
187 ea_name = SGI_ACL_DEFAULT;
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200188 break;
189 default:
190 return -EINVAL;
191 }
192
193 if (acl) {
194 struct xfs_acl *xfs_acl;
Dave Chinner0a8aa192013-06-05 12:09:10 +1000195 int len = XFS_ACL_MAX_SIZE(ip->i_mount);
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200196
Dave Chinnerfdd3cce2013-09-02 20:53:00 +1000197 xfs_acl = kmem_zalloc_large(len, KM_SLEEP);
198 if (!xfs_acl)
199 return -ENOMEM;
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200200
201 xfs_acl_to_disk(xfs_acl, acl);
Dave Chinner0a8aa192013-06-05 12:09:10 +1000202
203 /* subtract away the unused acl entries */
204 len -= sizeof(struct xfs_acl_entry) *
205 (XFS_ACL_MAX_ENTRIES(ip->i_mount) - acl->a_count);
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200206
Dave Chinner24513372014-06-25 14:58:08 +1000207 error = xfs_attr_set(ip, ea_name, (unsigned char *)xfs_acl,
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200208 len, ATTR_ROOT);
209
Dave Chinnerfdd3cce2013-09-02 20:53:00 +1000210 kmem_free(xfs_acl);
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200211 } else {
212 /*
213 * A NULL ACL argument means we want to remove the ACL.
214 */
Dave Chinner24513372014-06-25 14:58:08 +1000215 error = xfs_attr_remove(ip, ea_name, ATTR_ROOT);
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200216
217 /*
218 * If the attribute didn't exist to start with that's fine.
219 */
220 if (error == -ENOATTR)
221 error = 0;
222 }
223
224 if (!error)
Al Viro1cbd20d2009-06-09 13:29:39 -0400225 set_cached_acl(inode, type, acl);
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200226 return error;
227}
228
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200229static int
Al Virod3fb6122011-07-23 18:37:50 -0400230xfs_set_mode(struct inode *inode, umode_t mode)
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200231{
232 int error = 0;
233
234 if (mode != inode->i_mode) {
235 struct iattr iattr;
236
Christoph Hellwigd6d59ba2009-12-23 16:09:13 +0000237 iattr.ia_valid = ATTR_MODE | ATTR_CTIME;
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200238 iattr.ia_mode = mode;
Deepa Dinamanic2050a42016-09-14 07:48:06 -0700239 iattr.ia_ctime = current_time(inode);
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200240
Dave Chinner24513372014-06-25 14:58:08 +1000241 error = xfs_setattr_nonsize(XFS_I(inode), &iattr, XFS_ATTR_NOACL);
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200242 }
243
244 return error;
245}
246
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200247int
Christoph Hellwig2401dc22013-12-20 05:16:50 -0800248xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200249{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000250 int error = 0;
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200251
Christoph Hellwig2401dc22013-12-20 05:16:50 -0800252 if (!acl)
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200253 goto set_acl;
254
Jie Liu4ae69fe2014-02-07 15:26:11 +1100255 error = -E2BIG;
Dave Chinner0a8aa192013-06-05 12:09:10 +1000256 if (acl->a_count > XFS_ACL_MAX_ENTRIES(XFS_M(inode->i_sb)))
Christoph Hellwig2401dc22013-12-20 05:16:50 -0800257 return error;
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200258
259 if (type == ACL_TYPE_ACCESS) {
Jan Kara07393102016-09-19 17:39:09 +0200260 umode_t mode;
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200261
Jan Kara07393102016-09-19 17:39:09 +0200262 error = posix_acl_update_mode(inode, &mode, &acl);
263 if (error)
264 return error;
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200265 error = xfs_set_mode(inode, mode);
266 if (error)
Christoph Hellwig2401dc22013-12-20 05:16:50 -0800267 return error;
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200268 }
269
270 set_acl:
Christoph Hellwig2401dc22013-12-20 05:16:50 -0800271 return __xfs_set_acl(inode, type, acl);
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200272}