a951e327e6
when we mount and get zero cost if no rules are used in a mountpoint. Add code to deref rules on unmount. Switch from SLIST to TAILQ. Drop SYSINIT, use SX_SYSINIT and static initializer of TAILQ instead. Drop goto, a break will do. Reduce double pointers to single pointers. Combine reaping and destroying rulesets. Avoid memory leaks in a some error cases.
179 lines
5.8 KiB
C
179 lines
5.8 KiB
C
/*-
|
|
* 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 devfs_dirent {
|
|
struct cdev_priv *de_cdp;
|
|
int de_inode;
|
|
int de_flags;
|
|
#define DE_WHITEOUT 0x1
|
|
#define DE_DOT 0x2
|
|
#define DE_DOTDOT 0x4
|
|
struct dirent *de_dirent;
|
|
TAILQ_ENTRY(devfs_dirent) de_list;
|
|
TAILQ_HEAD(, devfs_dirent) 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;
|
|
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))
|
|
|
|
void devfs_rules_apply(struct devfs_mount *dm, struct devfs_dirent *de);
|
|
void devfs_rules_cleanup (struct devfs_mount *dm);
|
|
int devfs_rules_ioctl(struct devfs_mount *dm, u_long cmd, caddr_t data, struct thread *td);
|
|
int devfs_allocv (struct devfs_dirent *de, struct mount *mp, struct vnode **vpp, struct thread *td);
|
|
struct cdev **devfs_itod (int inode);
|
|
struct devfs_dirent **devfs_itode (struct devfs_mount *dm, int inode);
|
|
void devfs_delete(struct devfs_mount *dm, struct devfs_dirent *de);
|
|
void devfs_populate (struct devfs_mount *dm);
|
|
void devfs_cleanup (struct devfs_mount *dm);
|
|
struct devfs_dirent *devfs_newdirent (char *name, int namelen);
|
|
struct devfs_dirent *devfs_vmkdir (struct devfs_mount *, char *name, int namelen, struct devfs_dirent *dotdot, u_int inode);
|
|
struct devfs_dirent *devfs_find (struct devfs_dirent *dd, const char *name, int namelen);
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* !_FS_DEVFS_DEVFS_H_ */
|