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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
     22 /*	  All Rights Reserved  	*/
     23 
     24 /*
     25  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
     26  * Use is subject to license terms.
     27  */
     28 
     29 #ifndef	_SYS_FS_NAMENODE_H
     30 #define	_SYS_FS_NAMENODE_H
     31 
     32 #if defined(_KERNEL)
     33 #include <sys/vnode.h>
     34 #include <sys/vfs_opreg.h>
     35 #endif
     36 
     37 #ifdef	__cplusplus
     38 extern "C" {
     39 #endif
     40 
     41 /*
     42  * This structure is used to pass a file descriptor from user
     43  * level to the kernel. It is first used by fattach() and then
     44  * be NAMEFS.
     45  */
     46 struct namefd {
     47 	int fd;
     48 };
     49 
     50 #if defined(_KERNEL)
     51 /*
     52  * Each NAMEFS object is identified by a struct namenode/vnode pair.
     53  */
     54 struct namenode {
     55 	struct vnode    *nm_vnode;	/* represents mounted file desc. */
     56 	int		nm_flag;	/* flags defined below */
     57 	struct vattr    nm_vattr;	/* attributes of mounted file desc. */
     58 	struct vnode	*nm_filevp;	/* file desc. prior to mounting */
     59 	struct file	*nm_filep;	/* file pointer of nm_filevp */
     60 	struct vnode	*nm_mountpt;	/* mount point prior to mounting */
     61 	struct namenode *nm_nextp;	/* next link in the linked list */
     62 	kmutex_t	nm_lock;	/* protects nm_vattr */
     63 };
     64 
     65 /*
     66  * Valid flags for namenodes.
     67  */
     68 #define	NMNMNT		0x01	/* namenode not mounted */
     69 
     70 /*
     71  * Macros to convert a vnode to a namenode, and vice versa.
     72  */
     73 #define	VTONM(vp) ((struct namenode *)((vp)->v_data))
     74 #define	NMTOV(nm) ((nm)->nm_vnode)
     75 
     76 #define	NM_FILEVP_HASH_SIZE	64
     77 #define	NM_FILEVP_HASH_MASK	(NM_FILEVP_HASH_SIZE - 1)
     78 #define	NM_FILEVP_HASH_SHIFT	7
     79 #define	NM_FILEVP_HASH(vp)	(&nm_filevp_hash[(((uintptr_t)vp) >> \
     80 	NM_FILEVP_HASH_SHIFT) & NM_FILEVP_HASH_MASK])
     81 
     82 extern struct namenode *nm_filevp_hash[NM_FILEVP_HASH_SIZE];
     83 extern struct vfs namevfs;
     84 
     85 extern int nameinit(int, char *);
     86 extern int nm_unmountall(struct vnode *, struct cred *);
     87 extern void nameinsert(struct namenode *);
     88 extern void nameremove(struct namenode *);
     89 extern struct namenode *namefind(struct vnode *, struct vnode *);
     90 extern uint64_t namenodeno_alloc(void);
     91 extern void namenodeno_free(uint64_t);
     92 extern struct vnodeops *nm_vnodeops;
     93 extern const struct fs_operation_def nm_vnodeops_template[];
     94 extern kmutex_t ntable_lock;
     95 
     96 #endif /* _KERNEL */
     97 
     98 #ifdef	__cplusplus
     99 }
    100 #endif
    101 
    102 #endif	/* _SYS_FS_NAMENODE_H */
    103