2aeccbe957
With the ->set_acl inode operation we can implement the Posix ACL xattr handlers in generic code instead of duplicating them all over the tree. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/*
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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 <linux/posix_acl.h>
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/* Extended attribute names */
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#define POSIX_ACL_XATTR_ACCESS "system.posix_acl_access"
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#define POSIX_ACL_XATTR_DEFAULT "system.posix_acl_default"
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/* Supported ACL a_version fields */
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#define POSIX_ACL_XATTR_VERSION 0x0002
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/* An undefined entry e_id value */
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#define ACL_UNDEFINED_ID (-1)
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typedef struct {
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__le16 e_tag;
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__le16 e_perm;
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__le32 e_id;
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} posix_acl_xattr_entry;
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typedef struct {
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__le32 a_version;
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posix_acl_xattr_entry a_entries[0];
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} posix_acl_xattr_header;
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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(posix_acl_xattr_header) +
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(count * sizeof(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(posix_acl_xattr_header))
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return -1;
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size -= sizeof(posix_acl_xattr_header);
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if (size % sizeof(posix_acl_xattr_entry))
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return -1;
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return size / sizeof(posix_acl_xattr_entry);
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}
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#ifdef CONFIG_FS_POSIX_ACL
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void posix_acl_fix_xattr_from_user(void *value, size_t size);
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void posix_acl_fix_xattr_to_user(void *value, size_t size);
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#else
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static inline void posix_acl_fix_xattr_from_user(void *value, size_t size)
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{
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}
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static inline void posix_acl_fix_xattr_to_user(void *value, size_t size)
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{
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}
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#endif
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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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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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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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