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-rw-r--r--fs/Kconfig4
-rw-r--r--fs/Makefile1
-rw-r--r--fs/generic_acl.c197
-rw-r--r--include/linux/generic_acl.h36
4 files changed, 238 insertions, 0 deletions
diff --git a/fs/Kconfig b/fs/Kconfig
index d311198bba43..deb9eec9f6ee 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -1940,6 +1940,10 @@ config 9P_FS
1940 1940
1941 If unsure, say N. 1941 If unsure, say N.
1942 1942
1943config GENERIC_ACL
1944 bool
1945 select FS_POSIX_ACL
1946
1943endmenu 1947endmenu
1944 1948
1945menu "Partition Types" 1949menu "Partition Types"
diff --git a/fs/Makefile b/fs/Makefile
index 89135428a539..46b8cfe497b2 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -35,6 +35,7 @@ obj-$(CONFIG_BINFMT_FLAT) += binfmt_flat.o
35obj-$(CONFIG_FS_MBCACHE) += mbcache.o 35obj-$(CONFIG_FS_MBCACHE) += mbcache.o
36obj-$(CONFIG_FS_POSIX_ACL) += posix_acl.o xattr_acl.o 36obj-$(CONFIG_FS_POSIX_ACL) += posix_acl.o xattr_acl.o
37obj-$(CONFIG_NFS_COMMON) += nfs_common/ 37obj-$(CONFIG_NFS_COMMON) += nfs_common/
38obj-$(CONFIG_GENERIC_ACL) += generic_acl.o
38 39
39obj-$(CONFIG_QUOTA) += dquot.o 40obj-$(CONFIG_QUOTA) += dquot.o
40obj-$(CONFIG_QFMT_V1) += quota_v1.o 41obj-$(CONFIG_QFMT_V1) += quota_v1.o
diff --git a/fs/generic_acl.c b/fs/generic_acl.c
new file mode 100644
index 000000000000..9ccb78947171
--- /dev/null
+++ b/fs/generic_acl.c
@@ -0,0 +1,197 @@
1/*
2 * fs/generic_acl.c
3 *
4 * (C) 2005 Andreas Gruenbacher <agruen@suse.de>
5 *
6 * This file is released under the GPL.
7 */
8
9#include <linux/sched.h>
10#include <linux/fs.h>
11#include <linux/generic_acl.h>
12
13/**
14 * generic_acl_list - Generic xattr_handler->list() operation
15 * @ops: Filesystem specific getacl and setacl callbacks
16 */
17size_t
18generic_acl_list(struct inode *inode, struct generic_acl_operations *ops,
19 int type, char *list, size_t list_size)
20{
21 struct posix_acl *acl;
22 const char *name;
23 size_t size;
24
25 acl = ops->getacl(inode, type);
26 if (!acl)
27 return 0;
28 posix_acl_release(acl);
29
30 switch(type) {
31 case ACL_TYPE_ACCESS:
32 name = POSIX_ACL_XATTR_ACCESS;
33 break;
34
35 case ACL_TYPE_DEFAULT:
36 name = POSIX_ACL_XATTR_DEFAULT;
37 break;
38
39 default:
40 return 0;
41 }
42 size = strlen(name) + 1;
43 if (list && size <= list_size)
44 memcpy(list, name, size);
45 return size;
46}
47
48/**
49 * generic_acl_get - Generic xattr_handler->get() operation
50 * @ops: Filesystem specific getacl and setacl callbacks
51 */
52int
53generic_acl_get(struct inode *inode, struct generic_acl_operations *ops,
54 int type, void *buffer, size_t size)
55{
56 struct posix_acl *acl;
57 int error;
58
59 acl = ops->getacl(inode, type);
60 if (!acl)
61 return -ENODATA;
62 error = posix_acl_to_xattr(acl, buffer, size);
63 posix_acl_release(acl);
64
65 return error;
66}
67
68/**
69 * generic_acl_set - Generic xattr_handler->set() operation
70 * @ops: Filesystem specific getacl and setacl callbacks
71 */
72int
73generic_acl_set(struct inode *inode, struct generic_acl_operations *ops,
74 int type, const void *value, size_t size)
75{
76 struct posix_acl *acl = NULL;
77 int error;
78
79 if (S_ISLNK(inode->i_mode))
80 return -EOPNOTSUPP;
81 if (current->fsuid != inode->i_uid && !capable(CAP_FOWNER))
82 return -EPERM;
83 if (value) {
84 acl = posix_acl_from_xattr(value, size);
85 if (IS_ERR(acl))
86 return PTR_ERR(acl);
87 }
88 if (acl) {
89 mode_t mode;
90
91 error = posix_acl_valid(acl);
92 if (error)
93 goto failed;
94 switch(type) {
95 case ACL_TYPE_ACCESS:
96 mode = inode->i_mode;
97 error = posix_acl_equiv_mode(acl, &mode);
98 if (error < 0)
99 goto failed;
100 inode->i_mode = mode;
101 if (error == 0) {
102 posix_acl_release(acl);
103 acl = NULL;
104 }
105 break;
106
107 case ACL_TYPE_DEFAULT:
108 if (!S_ISDIR(inode->i_mode)) {
109 error = -EINVAL;
110 goto failed;
111 }
112 break;
113 }
114 }
115 ops->setacl(inode, type, acl);
116 error = 0;
117failed:
118 posix_acl_release(acl);
119 return error;
120}
121
122/**
123 * generic_acl_init - Take care of acl inheritance at @inode create time
124 * @ops: Filesystem specific getacl and setacl callbacks
125 *
126 * Files created inside a directory with a default ACL inherit the
127 * directory's default ACL.
128 */
129int
130generic_acl_init(struct inode *inode, struct inode *dir,
131 struct generic_acl_operations *ops)
132{
133 struct posix_acl *acl = NULL;
134 mode_t mode = inode->i_mode;
135 int error;
136
137 inode->i_mode = mode & ~current->fs->umask;
138 if (!S_ISLNK(inode->i_mode))
139 acl = ops->getacl(dir, ACL_TYPE_DEFAULT);
140 if (acl) {
141 struct posix_acl *clone;
142
143 if (S_ISDIR(inode->i_mode)) {
144 clone = posix_acl_clone(acl, GFP_KERNEL);
145 error = -ENOMEM;
146 if (!clone)
147 goto cleanup;
148 ops->setacl(inode, ACL_TYPE_DEFAULT, clone);
149 posix_acl_release(clone);
150 }
151 clone = posix_acl_clone(acl, GFP_KERNEL);
152 error = -ENOMEM;
153 if (!clone)
154 goto cleanup;
155 error = posix_acl_create_masq(clone, &mode);
156 if (error >= 0) {
157 inode->i_mode = mode;
158 if (error > 0)
159 ops->setacl(inode, ACL_TYPE_ACCESS, clone);
160 }
161 posix_acl_release(clone);
162 }
163 error = 0;
164
165cleanup:
166 posix_acl_release(acl);
167 return error;
168}
169
170/**
171 * generic_acl_chmod - change the access acl of @inode upon chmod()
172 * @ops: FIlesystem specific getacl and setacl callbacks
173 *
174 * A chmod also changes the permissions of the owner, group/mask, and
175 * other ACL entries.
176 */
177int
178generic_acl_chmod(struct inode *inode, struct generic_acl_operations *ops)
179{
180 struct posix_acl *acl, *clone;
181 int error = 0;
182
183 if (S_ISLNK(inode->i_mode))
184 return -EOPNOTSUPP;
185 acl = ops->getacl(inode, ACL_TYPE_ACCESS);
186 if (acl) {
187 clone = posix_acl_clone(acl, GFP_KERNEL);
188 posix_acl_release(acl);
189 if (!clone)
190 return -ENOMEM;
191 error = posix_acl_chmod_masq(clone, inode->i_mode);
192 if (!error)
193 ops->setacl(inode, ACL_TYPE_ACCESS, clone);
194 posix_acl_release(clone);
195 }
196 return error;
197}
diff --git a/include/linux/generic_acl.h b/include/linux/generic_acl.h
new file mode 100644
index 000000000000..80764f40be75
--- /dev/null
+++ b/include/linux/generic_acl.h
@@ -0,0 +1,36 @@
1/*
2 * fs/generic_acl.c
3 *
4 * (C) 2005 Andreas Gruenbacher <agruen@suse.de>
5 *
6 * This file is released under the GPL.
7 */
8
9#ifndef GENERIC_ACL_H
10#define GENERIC_ACL_H
11
12#include <linux/posix_acl.h>
13#include <linux/posix_acl_xattr.h>
14
15/**
16 * struct generic_acl_operations - filesystem operations
17 *
18 * Filesystems must make these operations available to the generic
19 * operations.
20 */
21struct generic_acl_operations {
22 struct posix_acl *(*getacl)(struct inode *, int);
23 void (*setacl)(struct inode *, int, struct posix_acl *);
24};
25
26size_t generic_acl_list(struct inode *, struct generic_acl_operations *, int,
27 char *, size_t);
28int generic_acl_get(struct inode *, struct generic_acl_operations *, int,
29 void *, size_t);
30int generic_acl_set(struct inode *, struct generic_acl_operations *, int,
31 const void *, size_t);
32int generic_acl_init(struct inode *, struct inode *,
33 struct generic_acl_operations *);
34int generic_acl_chmod(struct inode *, struct generic_acl_operations *);
35
36#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 01:49:04 -0500