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/* $NetBSD: specdev.h,v 1.53 2022/10/26 23:40:08 riastradh Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Copyright (c) 1990, 1993
* The Regents of the University of California. 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.
* 3. 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.
*
* @(#)specdev.h 8.6 (Berkeley) 5/21/95
*/
#ifndef _MISCFS_SPECFS_SPECDEV_H_
#define _MISCFS_SPECFS_SPECDEV_H_
#include <sys/mutex.h>
#include <sys/vnode.h>
typedef struct specnode {
vnode_t *sn_next;
struct specdev *sn_dev;
dev_t sn_rdev;
u_int sn_opencnt; /* # of opens, share of sd_opencnt */
bool sn_gone;
} specnode_t;
typedef struct specdev {
struct mount *sd_mountpoint;
struct lockf *sd_lockf;
vnode_t *sd_bdevvp;
u_int sd_opencnt; /* # of opens; close when ->0 */
u_int sd_refcnt; /* # of specnodes referencing this */
dev_t sd_rdev;
volatile u_int sd_iocnt; /* # bdev/cdev_* operations active */
bool sd_opened; /* true if successfully opened */
bool sd_closing; /* true when bdev/cdev_close ongoing */
} specdev_t;
/*
* Exported shorthand
*/
#define v_specnext v_specnode->sn_next
#define v_rdev v_specnode->sn_rdev
#define v_speclockf v_specnode->sn_dev->sd_lockf
/*
* Special device management
*/
void spec_node_init(vnode_t *, dev_t);
void spec_node_destroy(vnode_t *);
int spec_node_lookup_by_dev(enum vtype, dev_t, int, vnode_t **);
int spec_node_lookup_by_mount(struct mount *, vnode_t **);
struct mount *spec_node_getmountedfs(vnode_t *);
void spec_node_setmountedfs(vnode_t *, struct mount *);
void spec_node_revoke(vnode_t *);
/*
* Prototypes for special file operations on vnodes.
*/
extern const struct vnodeopv_desc spec_vnodeop_opv_desc;
extern int (**spec_vnodeop_p)(void *);
struct nameidata;
struct componentname;
struct flock;
struct buf;
struct uio;
int spec_lookup(void *);
int spec_open(void *);
int spec_close(void *);
int spec_read(void *);
int spec_write(void *);
int spec_fdiscard(void *);
int spec_ioctl(void *);
int spec_poll(void *);
int spec_kqfilter(void *);
int spec_mmap(void *);
int spec_fsync(void *);
#define spec_seek genfs_nullop /* XXX should query device */
int spec_inactive(void *);
int spec_reclaim(void *);
int spec_bmap(void *);
int spec_strategy(void *);
int spec_print(void *);
int spec_pathconf(void *);
int spec_advlock(void *);
/*
* This macro provides an initializer list for the fs-independent part
* of a filesystem's special file vnode ops descriptor table. We still
* need such a table in every filesystem, but we can at least avoid
* the cutpaste.
*
* This contains these ops:
* parsepath lookup
* create whiteout mknod open fallocate fdiscard ioctl poll kqfilter
* revoke mmap seek remove link rename mkdir rmdir symlink readdir
* readlink abortop bmap strategy pathconf advlock getpages putpages
*
* The filesystem should provide these ops that need to be its own:
* access and accessx
* getattr
* setattr
* fcntl
* inactive
* reclaim
* lock
* unlock
* print (should probably also call spec_print)
* islocked
* bwrite (normally vn_bwrite)
* openextattr
* closeextattr
* getextattr
* setextattr
* listextattr
* deleteextattr
* getacl
* setacl
* aclcheck
*
* The filesystem should also provide these ops that some filesystems
* do their own things with:
* close
* read
* write
* fsync
* In most cases "their own things" means adjust timestamps and call
* spec_foo. For fsync it varies, but should always also call spec_fsync.
*
* Note that because the op descriptor tables are unordered it does not
* matter where in the table this macro goes (except I think default
* still needs to be first...)
*/
#define GENFS_SPECOP_ENTRIES \
{ &vop_parsepath_desc, genfs_badop }, /* parsepath */ \
{ &vop_lookup_desc, spec_lookup }, /* lookup */ \
{ &vop_create_desc, genfs_badop }, /* create */ \
{ &vop_whiteout_desc, genfs_badop }, /* whiteout */ \
{ &vop_mknod_desc, genfs_badop }, /* mknod */ \
{ &vop_open_desc, spec_open }, /* open */ \
{ &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ \
{ &vop_fdiscard_desc, spec_fdiscard }, /* fdiscard */ \
{ &vop_ioctl_desc, spec_ioctl }, /* ioctl */ \
{ &vop_poll_desc, spec_poll }, /* poll */ \
{ &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ \
{ &vop_revoke_desc, genfs_revoke }, /* revoke */ \
{ &vop_mmap_desc, spec_mmap }, /* mmap */ \
{ &vop_seek_desc, spec_seek }, /* seek */ \
{ &vop_remove_desc, genfs_badop }, /* remove */ \
{ &vop_link_desc, genfs_badop }, /* link */ \
{ &vop_rename_desc, genfs_badop }, /* rename */ \
{ &vop_mkdir_desc, genfs_badop }, /* mkdir */ \
{ &vop_rmdir_desc, genfs_badop }, /* rmdir */ \
{ &vop_symlink_desc, genfs_badop }, /* symlink */ \
{ &vop_readdir_desc, genfs_badop }, /* readdir */ \
{ &vop_readlink_desc, genfs_badop }, /* readlink */ \
{ &vop_abortop_desc, genfs_badop }, /* abortop */ \
{ &vop_bmap_desc, spec_bmap }, /* bmap */ \
{ &vop_strategy_desc, spec_strategy }, /* strategy */ \
{ &vop_pathconf_desc, spec_pathconf }, /* pathconf */ \
{ &vop_advlock_desc, spec_advlock }, /* advlock */ \
{ &vop_getpages_desc, genfs_getpages }, /* getpages */ \
{ &vop_putpages_desc, genfs_putpages } /* putpages */
bool iskmemvp(struct vnode *);
void spec_init(void);
#endif /* _MISCFS_SPECFS_SPECDEV_H_ */
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