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extattr.h

/*    $OpenBSD: extattr.h,v 1.1 2002/02/22 20:37:46 drahn Exp $ */
/*-
 * Copyright (c) 1999, 2000, 2001 Robert N. M. Watson
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD: extattr.h,v 1.14 2001/09/12 08:38:10 julian Exp $
 */
/*
 * TrustedBSD Project - extended attribute support for UFS-like file systems
 */

#ifndef _UFS_UFS_EXTATTR_H_
#define     _UFS_UFS_EXTATTR_H_

#define     UFS_EXTATTR_MAGIC       0x00b5d5ec
#define     UFS_EXTATTR_VERSION           0x00000003
#define     UFS_EXTATTR_FSROOTSUBDIR      ".attribute"
#define     UFS_EXTATTR_SUBDIR_SYSTEM     "system"
#define     UFS_EXTATTR_SUBDIR_USER       "user"
#define     UFS_EXTATTR_MAXEXTATTRNAME    65    /* including null */

#define     UFS_EXTATTR_ATTR_FLAG_INUSE   0x00000001  /* attr has been set */
#define     UFS_EXTATTR_PERM_KERNEL       0x00000000
#define     UFS_EXTATTR_PERM_ROOT         0x00000001
#define     UFS_EXTATTR_PERM_OWNER        0x00000002
#define     UFS_EXTATTR_PERM_ANYONE       0x00000003

#define     UFS_EXTATTR_UEPM_INITIALIZED  0x00000001
#define     UFS_EXTATTR_UEPM_STARTED      0x00000002

#define     UFS_EXTATTR_CMD_START         0x00000001
#define     UFS_EXTATTR_CMD_STOP          0x00000002
#define     UFS_EXTATTR_CMD_ENABLE        0x00000003
#define     UFS_EXTATTR_CMD_DISABLE       0x00000004

struct ufs_extattr_fileheader {
      u_int uef_magic;  /* magic number for sanity checking */
      u_int uef_version;      /* version of attribute file */
      u_int uef_size;   /* size of attributes, w/o header */
};

struct ufs_extattr_header {
      u_int ueh_flags;  /* flags for attribute */
      u_int ueh_len;    /* local defined length; <= uef_size */
      u_int32_t   ueh_i_gen;  /* generation number for sanity */
      /* data follows the header */
};

#ifdef _KERNEL

#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_EXTATTR);
#endif

struct vnode;
LIST_HEAD(ufs_extattr_list_head, ufs_extattr_list_entry);
struct ufs_extattr_list_entry {
      LIST_ENTRY(ufs_extattr_list_entry)  uele_entries;
      struct ufs_extattr_fileheader       uele_fileheader;
      int   uele_attrnamespace;
      char  uele_attrname[UFS_EXTATTR_MAXEXTATTRNAME];
      struct vnode      *uele_backing_vnode;
};

struct lock;
struct ucred;
struct ufs_extattr_per_mount {
      struct lock uepm_lock;
      struct ufs_extattr_list_head  uepm_list;
      struct ucred      *uepm_ucred;
      int   uepm_flags;
};

void  ufs_extattr_uepm_init(struct ufs_extattr_per_mount *uepm);
void  ufs_extattr_uepm_destroy(struct ufs_extattr_per_mount *uepm);
int   ufs_extattr_start(struct mount *mp, struct proc *p);
int   ufs_extattr_autostart(struct mount *mp, struct proc *p);
int   ufs_extattr_stop(struct mount *mp, struct proc *p);
int   ufs_extattrctl(struct mount *mp, int cmd, struct vnode *filename,
          int attrnamespace, const char *attrname, struct proc *p);
void  ufs_extattr_vnode_inactive(struct vnode *vp, struct proc *p);

int   ufs_vop_getextattr(void *);
int   ufs_vop_setextattr(void *);

#endif /* !_KERNEL */

#endif /* !_UFS_UFS_EXTATTR_H_ */

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