blob: dbe2141d10ad7d77e67804ec3a8ee0e843a71486 [file] [log] [blame]
Jaegeuk Kim0a8165d2012-11-29 13:28:09 +09001/*
Jaegeuk Kimaf48b852012-11-02 17:12:17 +09002 * fs/f2fs/acl.c
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * Portions of this code from linux/fs/ext2/acl.c
8 *
9 * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15#include <linux/f2fs_fs.h>
16#include "f2fs.h"
17#include "xattr.h"
18#include "acl.h"
19
Jaegeuk Kimaf48b852012-11-02 17:12:17 +090020static inline size_t f2fs_acl_size(int count)
21{
22 if (count <= 4) {
23 return sizeof(struct f2fs_acl_header) +
24 count * sizeof(struct f2fs_acl_entry_short);
25 } else {
26 return sizeof(struct f2fs_acl_header) +
27 4 * sizeof(struct f2fs_acl_entry_short) +
28 (count - 4) * sizeof(struct f2fs_acl_entry);
29 }
30}
31
32static inline int f2fs_acl_count(size_t size)
33{
34 ssize_t s;
35 size -= sizeof(struct f2fs_acl_header);
36 s = size - 4 * sizeof(struct f2fs_acl_entry_short);
37 if (s < 0) {
38 if (size % sizeof(struct f2fs_acl_entry_short))
39 return -1;
40 return size / sizeof(struct f2fs_acl_entry_short);
41 } else {
42 if (s % sizeof(struct f2fs_acl_entry))
43 return -1;
44 return s / sizeof(struct f2fs_acl_entry) + 4;
45 }
46}
47
48static struct posix_acl *f2fs_acl_from_disk(const char *value, size_t size)
49{
50 int i, count;
51 struct posix_acl *acl;
52 struct f2fs_acl_header *hdr = (struct f2fs_acl_header *)value;
53 struct f2fs_acl_entry *entry = (struct f2fs_acl_entry *)(hdr + 1);
54 const char *end = value + size;
55
56 if (hdr->a_version != cpu_to_le32(F2FS_ACL_VERSION))
57 return ERR_PTR(-EINVAL);
58
59 count = f2fs_acl_count(size);
60 if (count < 0)
61 return ERR_PTR(-EINVAL);
62 if (count == 0)
63 return NULL;
64
65 acl = posix_acl_alloc(count, GFP_KERNEL);
66 if (!acl)
67 return ERR_PTR(-ENOMEM);
68
69 for (i = 0; i < count; i++) {
70
71 if ((char *)entry > end)
72 goto fail;
73
74 acl->a_entries[i].e_tag = le16_to_cpu(entry->e_tag);
75 acl->a_entries[i].e_perm = le16_to_cpu(entry->e_perm);
76
77 switch (acl->a_entries[i].e_tag) {
78 case ACL_USER_OBJ:
79 case ACL_GROUP_OBJ:
80 case ACL_MASK:
81 case ACL_OTHER:
Jaegeuk Kimaf48b852012-11-02 17:12:17 +090082 entry = (struct f2fs_acl_entry *)((char *)entry +
83 sizeof(struct f2fs_acl_entry_short));
84 break;
85
86 case ACL_USER:
87 acl->a_entries[i].e_uid =
88 make_kuid(&init_user_ns,
89 le32_to_cpu(entry->e_id));
90 entry = (struct f2fs_acl_entry *)((char *)entry +
91 sizeof(struct f2fs_acl_entry));
92 break;
93 case ACL_GROUP:
94 acl->a_entries[i].e_gid =
95 make_kgid(&init_user_ns,
96 le32_to_cpu(entry->e_id));
97 entry = (struct f2fs_acl_entry *)((char *)entry +
98 sizeof(struct f2fs_acl_entry));
99 break;
100 default:
101 goto fail;
102 }
103 }
104 if ((char *)entry != end)
105 goto fail;
106 return acl;
107fail:
108 posix_acl_release(acl);
109 return ERR_PTR(-EINVAL);
110}
111
112static void *f2fs_acl_to_disk(const struct posix_acl *acl, size_t *size)
113{
114 struct f2fs_acl_header *f2fs_acl;
115 struct f2fs_acl_entry *entry;
116 int i;
117
118 f2fs_acl = kmalloc(sizeof(struct f2fs_acl_header) + acl->a_count *
119 sizeof(struct f2fs_acl_entry), GFP_KERNEL);
120 if (!f2fs_acl)
121 return ERR_PTR(-ENOMEM);
122
123 f2fs_acl->a_version = cpu_to_le32(F2FS_ACL_VERSION);
124 entry = (struct f2fs_acl_entry *)(f2fs_acl + 1);
125
126 for (i = 0; i < acl->a_count; i++) {
127
128 entry->e_tag = cpu_to_le16(acl->a_entries[i].e_tag);
129 entry->e_perm = cpu_to_le16(acl->a_entries[i].e_perm);
130
131 switch (acl->a_entries[i].e_tag) {
132 case ACL_USER:
133 entry->e_id = cpu_to_le32(
134 from_kuid(&init_user_ns,
135 acl->a_entries[i].e_uid));
136 entry = (struct f2fs_acl_entry *)((char *)entry +
137 sizeof(struct f2fs_acl_entry));
138 break;
139 case ACL_GROUP:
140 entry->e_id = cpu_to_le32(
141 from_kgid(&init_user_ns,
142 acl->a_entries[i].e_gid));
143 entry = (struct f2fs_acl_entry *)((char *)entry +
144 sizeof(struct f2fs_acl_entry));
145 break;
146 case ACL_USER_OBJ:
147 case ACL_GROUP_OBJ:
148 case ACL_MASK:
149 case ACL_OTHER:
150 entry = (struct f2fs_acl_entry *)((char *)entry +
151 sizeof(struct f2fs_acl_entry_short));
152 break;
153 default:
154 goto fail;
155 }
156 }
157 *size = f2fs_acl_size(acl->a_count);
158 return (void *)f2fs_acl;
159
160fail:
161 kfree(f2fs_acl);
162 return ERR_PTR(-EINVAL);
163}
164
165struct posix_acl *f2fs_get_acl(struct inode *inode, int type)
166{
Jaegeuk Kimaf48b852012-11-02 17:12:17 +0900167 int name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
168 void *value = NULL;
169 struct posix_acl *acl;
170 int retval;
171
Jaegeuk Kimaf48b852012-11-02 17:12:17 +0900172 if (type == ACL_TYPE_ACCESS)
173 name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
174
175 retval = f2fs_getxattr(inode, name_index, "", NULL, 0);
176 if (retval > 0) {
Jaegeuk Kim808a1d72014-03-20 22:21:08 +0900177 value = kmalloc(retval, GFP_F2FS_ZERO);
Jaegeuk Kimaf48b852012-11-02 17:12:17 +0900178 if (!value)
179 return ERR_PTR(-ENOMEM);
180 retval = f2fs_getxattr(inode, name_index, "", value, retval);
181 }
182
Jaegeuk Kimc1b75ea2013-01-03 09:24:28 +0900183 if (retval > 0)
Jaegeuk Kimaf48b852012-11-02 17:12:17 +0900184 acl = f2fs_acl_from_disk(value, retval);
Jaegeuk Kimc1b75ea2013-01-03 09:24:28 +0900185 else if (retval == -ENODATA)
186 acl = NULL;
187 else
188 acl = ERR_PTR(retval);
Jaegeuk Kimaf48b852012-11-02 17:12:17 +0900189 kfree(value);
Jaegeuk Kimc1b75ea2013-01-03 09:24:28 +0900190
Jaegeuk Kimaf48b852012-11-02 17:12:17 +0900191 if (!IS_ERR(acl))
192 set_cached_acl(inode, type, acl);
193
194 return acl;
195}
196
Christoph Hellwiga6dda0e2013-12-20 05:16:45 -0800197static int __f2fs_set_acl(struct inode *inode, int type,
Jaegeuk Kim2ed2d5b2013-10-28 13:17:54 +0900198 struct posix_acl *acl, struct page *ipage)
Jaegeuk Kimaf48b852012-11-02 17:12:17 +0900199{
Jaegeuk Kimaf48b852012-11-02 17:12:17 +0900200 struct f2fs_inode_info *fi = F2FS_I(inode);
201 int name_index;
202 void *value = NULL;
203 size_t size = 0;
204 int error;
205
ZhangZhen3a8861e2014-04-04 09:47:16 +0800206 if (acl) {
207 error = posix_acl_valid(acl);
208 if (error < 0)
209 return error;
210 }
211
Jaegeuk Kimaf48b852012-11-02 17:12:17 +0900212 switch (type) {
213 case ACL_TYPE_ACCESS:
214 name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
215 if (acl) {
216 error = posix_acl_equiv_mode(acl, &inode->i_mode);
217 if (error < 0)
218 return error;
219 set_acl_inode(fi, inode->i_mode);
220 if (error == 0)
221 acl = NULL;
222 }
223 break;
224
225 case ACL_TYPE_DEFAULT:
226 name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
227 if (!S_ISDIR(inode->i_mode))
228 return acl ? -EACCES : 0;
229 break;
230
231 default:
232 return -EINVAL;
233 }
234
235 if (acl) {
236 value = f2fs_acl_to_disk(acl, &size);
237 if (IS_ERR(value)) {
238 cond_clear_inode_flag(fi, FI_ACL_MODE);
239 return (int)PTR_ERR(value);
240 }
241 }
242
Jaegeuk Kimc02745e2014-04-23 12:23:14 +0900243 error = f2fs_setxattr(inode, name_index, "", value, size, ipage, 0);
Jaegeuk Kimaf48b852012-11-02 17:12:17 +0900244
245 kfree(value);
246 if (!error)
247 set_cached_acl(inode, type, acl);
248
249 cond_clear_inode_flag(fi, FI_ACL_MODE);
250 return error;
251}
252
Christoph Hellwiga6dda0e2013-12-20 05:16:45 -0800253int f2fs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
Jaegeuk Kimaf48b852012-11-02 17:12:17 +0900254{
Christoph Hellwiga6dda0e2013-12-20 05:16:45 -0800255 return __f2fs_set_acl(inode, type, acl, NULL);
Jaegeuk Kimaf48b852012-11-02 17:12:17 +0900256}
257
Christoph Hellwiga6dda0e2013-12-20 05:16:45 -0800258int f2fs_init_acl(struct inode *inode, struct inode *dir, struct page *ipage)
Jaegeuk Kimaf48b852012-11-02 17:12:17 +0900259{
Christoph Hellwiga6dda0e2013-12-20 05:16:45 -0800260 struct posix_acl *default_acl, *acl;
261 int error = 0;
Jaegeuk Kimaf48b852012-11-02 17:12:17 +0900262
Christoph Hellwiga6dda0e2013-12-20 05:16:45 -0800263 error = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
Jaegeuk Kimaf48b852012-11-02 17:12:17 +0900264 if (error)
265 return error;
Jaegeuk Kimb8b60e12013-10-28 13:12:09 +0900266
Christoph Hellwiga6dda0e2013-12-20 05:16:45 -0800267 if (default_acl) {
268 error = __f2fs_set_acl(inode, ACL_TYPE_DEFAULT, default_acl,
269 ipage);
270 posix_acl_release(default_acl);
271 }
272 if (acl) {
273 if (error)
274 error = __f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl,
275 ipage);
276 posix_acl_release(acl);
Jaegeuk Kimaf48b852012-11-02 17:12:17 +0900277 }
278
Jaegeuk Kimaf48b852012-11-02 17:12:17 +0900279 return error;
280}