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freebsd-skq/sys/fs/devfs/devfs.h
mm 27a58a0dde Introduce the "ruleset=number" option for devfs(5) mounts. 
Add support for updating the devfs mount (currently only changing the
ruleset number is supported).
Check mnt_optnew with vfs_filteropt(9).

This new option sets the specified ruleset number as the active ruleset
of the new devfs mount and applies all its rules at mount time. If the
specified ruleset doesn't exist, a new empty ruleset is created.

MFC after:	1 month
2012-02-09 10:09:12 +00:00

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/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
* Copyright (c) 2000
* Poul-Henning Kamp. All rights reserved.
* Copyright (c) 2002
* Dima Dorfman. All rights reserved.
*
* This code is derived from software donated to Berkeley by
* Jan-Simon Pendry.
*
* 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. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* @(#)kernfs.h 8.6 (Berkeley) 3/29/95
* From: FreeBSD: src/sys/miscfs/kernfs/kernfs.h 1.14
*
* $FreeBSD$
*/
#ifndef _FS_DEVFS_DEVFS_H_
#define _FS_DEVFS_DEVFS_H_
#define DEVFS_MAGIC 0xdb0a087a
/*
* Identifiers. The ruleset and rule numbers are 16-bit values. The
* "rule ID" is a combination of the ruleset and rule number; it
* should be able to univocally describe a rule in the system. In
* this implementation, the upper 16 bits of the rule ID is the
* ruleset number; the lower 16 bits, the rule number within the
* aforementioned ruleset.
*/
typedef uint16_t devfs_rnum;
typedef uint16_t devfs_rsnum;
typedef uint32_t devfs_rid;
/*
* Identifier manipulators.
*/
#define rid2rsn(rid) ((rid) >> 16)
#define rid2rn(rid) ((rid) & 0xffff)
#define mkrid(rsn, rn) ((rn) | ((rsn) << 16))
/*
* Plain DEVFS rule. This gets shared between kernel and userland
* verbatim, so it shouldn't contain any pointers or other kernel- or
* userland-specific values.
*/
struct devfs_rule {
uint32_t dr_magic; /* Magic number. */
devfs_rid dr_id; /* Identifier. */
/*
* Conditions under which this rule should be applied. These
* are ANDed together since OR can be simulated by using
* multiple rules. dr_icond determines which of the other
* variables we should process.
*/
int dr_icond;
#define DRC_DSWFLAGS 0x001
#define DRC_PATHPTRN 0x002
int dr_dswflags; /* cdevsw flags to match. */
#define DEVFS_MAXPTRNLEN 200
char dr_pathptrn[DEVFS_MAXPTRNLEN]; /* Pattern to match path. */
/*
* Things to change. dr_iacts determines which of the other
* variables we should process.
*/
int dr_iacts;
#define DRA_BACTS 0x001
#define DRA_UID 0x002
#define DRA_GID 0x004
#define DRA_MODE 0x008
#define DRA_INCSET 0x010
int dr_bacts; /* Boolean (on/off) action. */
#define DRB_HIDE 0x001 /* Hide entry (DE_WHITEOUT). */
#define DRB_UNHIDE 0x002 /* Unhide entry. */
uid_t dr_uid;
gid_t dr_gid;
mode_t dr_mode;
devfs_rsnum dr_incset; /* Included ruleset. */
};
/*
* Rule-related ioctls.
*/
#define DEVFSIO_RADD _IOWR('D', 0, struct devfs_rule)
#define DEVFSIO_RDEL _IOW('D', 1, devfs_rid)
#define DEVFSIO_RAPPLY _IOW('D', 2, struct devfs_rule)
#define DEVFSIO_RAPPLYID _IOW('D', 3, devfs_rid)
#define DEVFSIO_RGETNEXT _IOWR('D', 4, struct devfs_rule)
#define DEVFSIO_SUSE _IOW('D', 10, devfs_rsnum)
#define DEVFSIO_SAPPLY _IOW('D', 11, devfs_rsnum)
#define DEVFSIO_SGETNEXT _IOWR('D', 12, devfs_rsnum)
/* XXX: DEVFSIO_RS_GET_INFO for refcount, active if any, etc. */
#ifdef _KERNEL
#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_DEVFS);
#endif
struct componentname;
TAILQ_HEAD(devfs_dlist_head, devfs_dirent);
struct devfs_dirent {
struct cdev_priv *de_cdp;
int de_inode;
int de_flags;
#define DE_WHITEOUT 0x01
#define DE_DOT 0x02
#define DE_DOTDOT 0x04
#define DE_DOOMED 0x08
#define DE_COVERED 0x10
#define DE_USER 0x20
int de_holdcnt;
struct dirent *de_dirent;
TAILQ_ENTRY(devfs_dirent) de_list;
struct devfs_dlist_head de_dlist;
struct devfs_dirent *de_dir;
int de_links;
mode_t de_mode;
uid_t de_uid;
gid_t de_gid;
struct label *de_label;
struct timespec de_atime;
struct timespec de_mtime;
struct timespec de_ctime;
struct vnode *de_vnode;
char *de_symlink;
};
struct devfs_mount {
u_int dm_idx;
struct mount *dm_mount;
struct devfs_dirent *dm_rootdir;
unsigned dm_generation;
int dm_holdcnt;
struct sx dm_lock;
devfs_rsnum dm_ruleset;
};
#define DEVFS_ROOTINO 2
extern unsigned devfs_rule_depth;
#define VFSTODEVFS(mp) ((struct devfs_mount *)((mp)->mnt_data))
#define DEVFS_DE_HOLD(de) ((de)->de_holdcnt++)
#define DEVFS_DE_DROP(de) (--(de)->de_holdcnt == 0)
#define DEVFS_DMP_HOLD(dmp) ((dmp)->dm_holdcnt++)
#define DEVFS_DMP_DROP(dmp) (--(dmp)->dm_holdcnt == 0)
#define DEVFS_DEL_VNLOCKED 0x01
#define DEVFS_DEL_NORECURSE 0x02
void devfs_rules_apply(struct devfs_mount *, struct devfs_dirent *);
void devfs_rules_cleanup(struct devfs_mount *);
int devfs_rules_ioctl(struct devfs_mount *, u_long, caddr_t,
struct thread *);
void devfs_ruleset_set(devfs_rsnum rsnum, struct devfs_mount *dm);
void devfs_ruleset_apply(struct devfs_mount *dm);
int devfs_allocv(struct devfs_dirent *, struct mount *, int,
struct vnode **);
char *devfs_fqpn(char *, struct devfs_mount *, struct devfs_dirent *,
struct componentname *);
void devfs_delete(struct devfs_mount *, struct devfs_dirent *, int);
void devfs_dirent_free(struct devfs_dirent *);
void devfs_populate(struct devfs_mount *);
void devfs_cleanup(struct devfs_mount *);
void devfs_unmount_final(struct devfs_mount *);
struct devfs_dirent *devfs_newdirent(char *, int);
struct devfs_dirent *devfs_parent_dirent(struct devfs_dirent *);
struct devfs_dirent *devfs_vmkdir(struct devfs_mount *, char *, int,
struct devfs_dirent *, u_int);
struct devfs_dirent *devfs_find(struct devfs_dirent *, const char *, int,
int);
#endif /* _KERNEL */
#endif /* !_FS_DEVFS_DEVFS_H_ */
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