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/*-
* Copyright (c) 1999-2001 Robert N. M. Watson
* All rights reserved.
*
* This software was developed by Robert Watson for the TrustedBSD Project.
*
* 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.
*
* $FreeBSD$
*/
/*
* Developed by the TrustedBSD Project.
* Support for extended filesystem attributes.
*/
#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 */
};
/*
* This structure defines the required fields of an extended-attribute header.
*/
struct extattr {
int32_t ea_length; /* length of this attribute */
int8_t ea_namespace; /* name space of this attribute */
int8_t ea_contentpadlen; /* bytes of padding at end of attribute */
int8_t ea_namelength; /* length of attribute name */
char ea_name[1]; /* null-terminated attribute name */
/* extended attribute content follows */
};
/*
* These macros are used to access and manipulate an extended attribute:
*
* EXTATTR_NEXT(eap) returns a pointer to the next extended attribute
* following eap.
* EXTATTR_CONTENT(eap) returns a pointer to the extended attribute
* content referenced by eap.
* EXTATTR_CONTENT_SIZE(eap) returns the size of the extended attribute
* content referenced by eap.
* EXTATTR_SET_LENGTHS(eap, contentsize) called after initializing the
* attribute name to calculate and set the ea_length, ea_namelength,
* and ea_contentpadlen fields of the extended attribute structure.
*/
#define EXTATTR_NEXT(eap) \
((struct extattr *)(((void *)(eap)) + (eap)->ea_length))
#define EXTATTR_CONTENT(eap) (((void *)(eap)) + EXTATTR_BASE_LENGTH(eap))
#define EXTATTR_CONTENT_SIZE(eap) \
((eap)->ea_length - EXTATTR_BASE_LENGTH(eap) - (eap)->ea_contentpadlen)
#define EXTATTR_BASE_LENGTH(eap) \
((sizeof(struct extattr) + (eap)->ea_namelength + 7) & ~7)
#define EXTATTR_SET_LENGTHS(eap, contentsize) do { \
KASSERT(((eap)->ea_name[0] != 0), \
("Must initialize name before setting lengths")); \
(eap)->ea_namelength = strlen((eap)->ea_name); \
(eap)->ea_contentpadlen = ((contentsize) % 8) ? \
8 - ((contentsize) % 8) : 0; \
(eap)->ea_length = EXTATTR_BASE_LENGTH(eap) + \
(contentsize) + (eap)->ea_contentpadlen; \
} while (0)
#ifdef _KERNEL
#include <sys/_sx.h>
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 ucred;
struct ufs_extattr_per_mount {
struct sx 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 thread *td);
int ufs_extattr_autostart(struct mount *mp, struct thread *td);
int ufs_extattr_stop(struct mount *mp, struct thread *td);
int ufs_extattrctl(struct mount *mp, int cmd, struct vnode *filename,
int attrnamespace, const char *attrname);
int ufs_getextattr(struct vop_getextattr_args *ap);
int ufs_deleteextattr(struct vop_deleteextattr_args *ap);
int ufs_setextattr(struct vop_setextattr_args *ap);
void ufs_extattr_vnode_inactive(struct vnode *vp, struct thread *td);
#else
/* User-level definition of KASSERT for macros above */
#define KASSERT(cond, str) do { \
if (!(cond)) { printf("panic: "); printf(str); printf("\n"); exit(1); }\
} while (0)
#endif /* !_KERNEL */
#endif /* !_UFS_UFS_EXTATTR_H_ */
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