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      1 /*	$NetBSD: ulfs_extattr.h,v 1.3 2016/06/20 01:56:21 dholland Exp $	*/
      2 /*  from NetBSD: extattr.h,v 1.11 2014/12/19 10:59:21 manu Exp  */
      3 
      4 /*-
      5  * Copyright (c) 1999-2001 Robert N. M. Watson
      6  * All rights reserved.
      7  *
      8  * This software was developed by Robert Watson for the TrustedBSD Project.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  *
     31  * $FreeBSD: src/sys/ufs/ufs/extattr.h,v 1.20 2005/01/31 08:16:45 imp Exp $
     32  */
     33 
     34 /*
     35  * Support for file system extended attributes on the ULFS1 file system.
     36  * Developed by the TrustedBSD Project.
     37  */
     38 
     39 #ifndef _UFS_LFS_ULFS_EXTATTR_H_
     40 #define	_UFS_LFS_ULFS_EXTATTR_H_
     41 
     42 #define	ULFS_EXTATTR_MAGIC		0x00b5d5ec
     43 #define	ULFS_EXTATTR_VERSION		0x00000003
     44 #define	ULFS_EXTATTR_FSROOTSUBDIR	".attribute"
     45 #define	ULFS_EXTATTR_SUBDIR_SYSTEM	"system"
     46 #define	ULFS_EXTATTR_SUBDIR_USER		"user"
     47 #define	ULFS_EXTATTR_MAXEXTATTRNAME	256	/* including null */
     48 
     49 #define	ULFS_EXTATTR_ATTR_FLAG_INUSE	0x00000001	/* attr has been set */
     50 #define	ULFS_EXTATTR_PERM_KERNEL		0x00000000
     51 #define	ULFS_EXTATTR_PERM_ROOT		0x00000001
     52 #define	ULFS_EXTATTR_PERM_OWNER		0x00000002
     53 #define	ULFS_EXTATTR_PERM_ANYONE		0x00000003
     54 
     55 #define	ULFS_EXTATTR_UEPM_INITIALIZED	0x00000001
     56 #define	ULFS_EXTATTR_UEPM_STARTED	0x00000002
     57 
     58 #define	ULFS_EXTATTR_CMD_START		EXTATTR_CMD_START
     59 #define	ULFS_EXTATTR_CMD_STOP		EXTATTR_CMD_STOP
     60 #define	ULFS_EXTATTR_CMD_ENABLE		0x00000003
     61 #define	ULFS_EXTATTR_CMD_DISABLE		0x00000004
     62 
     63 struct ulfs_extattr_fileheader {
     64 	uint32_t	uef_magic;	/* magic number for sanity checking */
     65 	uint32_t	uef_version;	/* version of attribute file */
     66 	uint32_t	uef_size;	/* size of attributes, w/o header */
     67 };
     68 
     69 struct ulfs_extattr_header {
     70 	uint32_t	ueh_flags;	/* flags for attribute */
     71 	uint32_t	ueh_len;	/* local defined length; <= uef_size */
     72 	uint32_t	ueh_i_gen;	/* generation number for sanity */
     73 	/* data follows the header */
     74 };
     75 
     76 #ifdef _KERNEL
     77 
     78 #ifdef MALLOC_DECLARE
     79 MALLOC_DECLARE(M_EXTATTR);
     80 #endif
     81 
     82 struct vnode;
     83 LIST_HEAD(ulfs_extattr_list_head, ulfs_extattr_list_entry);
     84 struct ulfs_extattr_list_entry {
     85 	LIST_ENTRY(ulfs_extattr_list_entry)	uele_entries;
     86 	struct ulfs_extattr_fileheader		uele_fileheader;
     87 	int		uele_attrnamespace;
     88 	char		uele_attrname[ULFS_EXTATTR_MAXEXTATTRNAME];
     89 	struct vnode	*uele_backing_vnode;
     90 	int		uele_flags;
     91 };
     92 
     93 /* uele_flags */
     94 #define	UELE_F_NEEDSWAP		0x01	/* needs byte swap */
     95 
     96 #define	UELE_NEEDSWAP(uele)	((uele)->uele_flags & UELE_F_NEEDSWAP)
     97 
     98 struct lock;
     99 struct ulfs_extattr_per_mount {
    100 	kmutex_t			uepm_lock;
    101 	struct ulfs_extattr_list_head	uepm_list;
    102 	kauth_cred_t			uepm_ucred;
    103 	int				uepm_lockcnt;
    104 	int				uepm_flags;
    105 };
    106 
    107 void	ulfs_extattr_uepm_init(struct ulfs_extattr_per_mount *uepm);
    108 void	ulfs_extattr_uepm_destroy(struct ulfs_extattr_per_mount *uepm);
    109 int	ulfs_extattr_start(struct mount *mp, struct lwp *l);
    110 int	ulfs_extattr_autostart(struct mount *mp, struct lwp *l);
    111 void	ulfs_extattr_stop(struct mount *mp, struct lwp *l);
    112 int	ulfs_extattrctl(struct mount *mp, int cmd, struct vnode *filename,
    113 	    int attrnamespace, const char *attrname);
    114 struct vop_getextattr_args;
    115 int	ulfs_getextattr(struct vop_getextattr_args *ap);
    116 struct vop_deleteextattr_args;
    117 int	ulfs_deleteextattr(struct vop_deleteextattr_args *ap);
    118 struct vop_setextattr_args;
    119 int	ulfs_setextattr(struct vop_setextattr_args *ap);
    120 struct vop_listextattr_args;
    121 int	ulfs_listextattr(struct vop_listextattr_args *ap);
    122 void	ulfs_extattr_vnode_inactive(struct vnode *vp, struct lwp *l);
    123 
    124 void	ulfs_extattr_init(void);
    125 void	ulfs_extattr_done(void);
    126 
    127 #endif /* !_KERNEL */
    128 
    129 #endif /* !_UFS_LFS_ULFS_EXTATTR_H_ */
    130