4 * Almost all from linux/fs/ext2/acl.c:
5 * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
8 #include <linux/module.h>
9 #include <linux/slab.h>
11 #include <linux/posix_acl_xattr.h>
15 * Convert from extended attribute to in-memory representation.
18 posix_acl_from_xattr(const void *value
, size_t size
)
20 posix_acl_xattr_header
*header
= (posix_acl_xattr_header
*)value
;
21 posix_acl_xattr_entry
*entry
= (posix_acl_xattr_entry
*)(header
+1), *end
;
23 struct posix_acl
*acl
;
24 struct posix_acl_entry
*acl_e
;
28 if (size
< sizeof(posix_acl_xattr_header
))
29 return ERR_PTR(-EINVAL
);
30 if (header
->a_version
!= cpu_to_le32(POSIX_ACL_XATTR_VERSION
))
31 return ERR_PTR(-EOPNOTSUPP
);
33 count
= posix_acl_xattr_count(size
);
35 return ERR_PTR(-EINVAL
);
39 acl
= posix_acl_alloc(count
, GFP_KERNEL
);
41 return ERR_PTR(-ENOMEM
);
42 acl_e
= acl
->a_entries
;
44 for (end
= entry
+ count
; entry
!= end
; acl_e
++, entry
++) {
45 acl_e
->e_tag
= le16_to_cpu(entry
->e_tag
);
46 acl_e
->e_perm
= le16_to_cpu(entry
->e_perm
);
48 switch(acl_e
->e_tag
) {
53 acl_e
->e_id
= ACL_UNDEFINED_ID
;
58 acl_e
->e_id
= le32_to_cpu(entry
->e_id
);
68 posix_acl_release(acl
);
69 return ERR_PTR(-EINVAL
);
71 EXPORT_SYMBOL (posix_acl_from_xattr
);
74 * Convert from in-memory to extended attribute representation.
77 posix_acl_to_xattr(const struct posix_acl
*acl
, void *buffer
, size_t size
)
79 posix_acl_xattr_header
*ext_acl
= (posix_acl_xattr_header
*)buffer
;
80 posix_acl_xattr_entry
*ext_entry
= ext_acl
->a_entries
;
83 real_size
= posix_acl_xattr_size(acl
->a_count
);
89 ext_acl
->a_version
= cpu_to_le32(POSIX_ACL_XATTR_VERSION
);
91 for (n
=0; n
< acl
->a_count
; n
++, ext_entry
++) {
92 ext_entry
->e_tag
= cpu_to_le16(acl
->a_entries
[n
].e_tag
);
93 ext_entry
->e_perm
= cpu_to_le16(acl
->a_entries
[n
].e_perm
);
94 ext_entry
->e_id
= cpu_to_le32(acl
->a_entries
[n
].e_id
);
98 EXPORT_SYMBOL (posix_acl_to_xattr
);
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