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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright 2020 OmniOS Community Edition (OmniOSce) Association.
*/
#ifndef _SYS_FS_NAMENODE_H
#define _SYS_FS_NAMENODE_H
#if defined(_KERNEL)
#include <sys/vnode.h>
#include <sys/vfs_opreg.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
/*
* This structure is used to pass a file descriptor from user
* level to the kernel. It is first used by fattach() and then
* be NAMEFS.
*/
struct namefd {
int fd;
};
#if defined(_KERNEL)
/*
* Each NAMEFS object is identified by a struct namenode/vnode pair.
*/
struct namenode {
struct vnode *nm_vnode; /* represents mounted file desc. */
int nm_flag; /* flags defined below */
struct vattr nm_vattr; /* attributes of mounted file desc. */
struct vnode *nm_filevp; /* file desc. prior to mounting */
struct file *nm_filep; /* file pointer of nm_filevp */
struct vnode *nm_mountpt; /* mount point prior to mounting */
struct namenode *nm_nextp; /* next link in the linked list */
kmutex_t nm_lock; /* protects nm_vattr */
};
/*
* Valid flags for namenodes.
*/
#define NMNMNT 0x01 /* namenode not mounted */
/*
* Macros to convert a vnode to a namenode, and vice versa.
*/
#define VTONM(vp) ((struct namenode *)((vp)->v_data))
#define NMTOV(nm) ((nm)->nm_vnode)
#define NM_FILEVP_HASH_SIZE 64
#define NM_FILEVP_HASH_MASK (NM_FILEVP_HASH_SIZE - 1)
#define NM_FILEVP_HASH_SHIFT 7
#define NM_FILEVP_HASH(vp) (&nm_filevp_hash[(((uintptr_t)vp) >> \
NM_FILEVP_HASH_SHIFT) & NM_FILEVP_HASH_MASK])
extern struct namenode *nm_filevp_hash[NM_FILEVP_HASH_SIZE];
extern struct vfs namevfs;
extern int nameinit(int, char *);
extern int nm_unmountall(struct vnode *, struct cred *);
extern void nameinsert(struct namenode *);
extern void nameremove(struct namenode *);
extern struct namenode *namefind(struct vnode *, struct vnode *);
extern uint64_t namenodeno_alloc(void);
extern void namenodeno_free(uint64_t);
extern struct vnodeops *nm_vnodeops;
extern const struct fs_operation_def nm_vnodeops_template[];
extern kmutex_t ntable_lock;
typedef int nm_walk_mounts_f(const struct namenode *, cred_t *, void *);
extern int nm_walk_mounts(const vnode_t *, nm_walk_mounts_f *, cred_t *,
void *);
#endif /* _KERNEL */
#ifdef __cplusplus
}
#endif
#endif /* _SYS_FS_NAMENODE_H */
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