75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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File: linux/posix_acl_xattr.h
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Extended attribute system call representation of Access Control Lists.
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Copyright (C) 2000 by Andreas Gruenbacher <a.gruenbacher@computer.org>
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Copyright (C) 2002 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com>
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*/
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#ifndef _POSIX_ACL_XATTR_H
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#define _POSIX_ACL_XATTR_H
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#include <uapi/linux/xattr.h>
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#include <uapi/linux/posix_acl_xattr.h>
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#include <linux/posix_acl.h>
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static inline size_t
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posix_acl_xattr_size(int count)
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{
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return (sizeof(struct posix_acl_xattr_header) +
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(count * sizeof(struct posix_acl_xattr_entry)));
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}
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static inline int
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posix_acl_xattr_count(size_t size)
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{
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if (size < sizeof(struct posix_acl_xattr_header))
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return -1;
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size -= sizeof(struct posix_acl_xattr_header);
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if (size % sizeof(struct posix_acl_xattr_entry))
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return -1;
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return size / sizeof(struct posix_acl_xattr_entry);
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}
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#ifdef CONFIG_FS_POSIX_ACL
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struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns,
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const void *value, size_t size);
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#else
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static inline struct posix_acl *
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posix_acl_from_xattr(struct user_namespace *user_ns, const void *value,
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size_t size)
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{
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return ERR_PTR(-EOPNOTSUPP);
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}
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#endif
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int posix_acl_to_xattr(struct user_namespace *user_ns,
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const struct posix_acl *acl, void *buffer, size_t size);
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static inline const char *posix_acl_xattr_name(int type)
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{
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switch (type) {
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case ACL_TYPE_ACCESS:
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return XATTR_NAME_POSIX_ACL_ACCESS;
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case ACL_TYPE_DEFAULT:
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return XATTR_NAME_POSIX_ACL_DEFAULT;
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}
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return "";
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}
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static inline int posix_acl_type(const char *name)
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{
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if (strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS) == 0)
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return ACL_TYPE_ACCESS;
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else if (strcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT) == 0)
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return ACL_TYPE_DEFAULT;
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return -1;
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}
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extern const struct xattr_handler posix_acl_access_xattr_handler;
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extern const struct xattr_handler posix_acl_default_xattr_handler;
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#endif /* _POSIX_ACL_XATTR_H */
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