4 * (C) 2005 Andreas Gruenbacher <agruen@suse.de>
6 * This file is released under the GPL.
10 #include <linux/shmem_fs.h>
11 #include <linux/xattr.h>
12 #include <linux/generic_acl.h>
15 * shmem_get_acl - generic_acl_operations->getacl() operation
17 static struct posix_acl *
18 shmem_get_acl(struct inode *inode, int type)
20 struct posix_acl *acl = NULL;
22 spin_lock(&inode->i_lock);
25 acl = posix_acl_dup(inode->i_acl);
28 case ACL_TYPE_DEFAULT:
29 acl = posix_acl_dup(inode->i_default_acl);
32 spin_unlock(&inode->i_lock);
38 * shmem_set_acl - generic_acl_operations->setacl() operation
41 shmem_set_acl(struct inode *inode, int type, struct posix_acl *acl)
43 struct posix_acl *free = NULL;
45 spin_lock(&inode->i_lock);
49 inode->i_acl = posix_acl_dup(acl);
52 case ACL_TYPE_DEFAULT:
53 free = inode->i_default_acl;
54 inode->i_default_acl = posix_acl_dup(acl);
57 spin_unlock(&inode->i_lock);
58 posix_acl_release(free);
61 struct generic_acl_operations shmem_acl_ops = {
62 .getacl = shmem_get_acl,
63 .setacl = shmem_set_acl,
67 shmem_xattr_list_acl(struct dentry *dentry, char *list, size_t list_size,
68 const char *name, size_t name_len, int type)
70 return generic_acl_list(dentry->d_inode, &shmem_acl_ops,
71 type, list, list_size);
75 shmem_xattr_get_acl(struct dentry *dentry, const char *name, void *buffer,
76 size_t size, int type)
78 if (strcmp(name, "") != 0)
80 return generic_acl_get(dentry->d_inode, &shmem_acl_ops, type,
85 shmem_xattr_set_acl(struct dentry *dentry, const char *name, const void *value,
86 size_t size, int flags, int type)
88 if (strcmp(name, "") != 0)
90 return generic_acl_set(dentry->d_inode, &shmem_acl_ops, type,
94 struct xattr_handler shmem_xattr_acl_access_handler = {
95 .prefix = POSIX_ACL_XATTR_ACCESS,
96 .flags = ACL_TYPE_ACCESS,
97 .list = shmem_xattr_list_acl,
98 .get = shmem_xattr_get_acl,
99 .set = shmem_xattr_set_acl,
102 struct xattr_handler shmem_xattr_acl_default_handler = {
103 .prefix = POSIX_ACL_XATTR_DEFAULT,
104 .flags = ACL_TYPE_DEFAULT,
105 .list = shmem_xattr_list_acl,
106 .get = shmem_xattr_get_acl,
107 .set = shmem_xattr_set_acl,
111 * shmem_acl_init - Inizialize the acl(s) of a new inode
114 shmem_acl_init(struct inode *inode, struct inode *dir)
116 return generic_acl_init(inode, dir, &shmem_acl_ops);
120 * shmem_check_acl - check_acl() callback for generic_permission()
123 shmem_check_acl(struct inode *inode, int mask)
125 struct posix_acl *acl = shmem_get_acl(inode, ACL_TYPE_ACCESS);
128 int error = posix_acl_permission(inode, acl, mask);
129 posix_acl_release(acl);