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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 23 /* All Rights Reserved */ 24 25 /* 26 * Copyright 2003 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 30 #ifndef _SYS_FS_NAMENODE_H 31 #define _SYS_FS_NAMENODE_H 32 33 #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.4 */ 34 35 #if defined(_KERNEL) 36 #include <sys/vnode.h> 37 #endif 38 39 #ifdef __cplusplus 40 extern "C" { 41 #endif 42 43 /* 44 * This structure is used to pass a file descriptor from user 45 * level to the kernel. It is first used by fattach() and then 46 * be NAMEFS. 47 */ 48 struct namefd { 49 int fd; 50 }; 51 52 #if defined(_KERNEL) 53 /* 54 * Each NAMEFS object is identified by a struct namenode/vnode pair. 55 */ 56 struct namenode { 57 struct vnode *nm_vnode; /* represents mounted file desc. */ 58 int nm_flag; /* flags defined below */ 59 struct vattr nm_vattr; /* attributes of mounted file desc. */ 60 struct vnode *nm_filevp; /* file desc. prior to mounting */ 61 struct file *nm_filep; /* file pointer of nm_filevp */ 62 struct vnode *nm_mountpt; /* mount point prior to mounting */ 63 struct namenode *nm_nextp; /* next link in the linked list */ 64 kmutex_t nm_lock; /* protects nm_vattr */ 65 }; 66 67 /* 68 * Valid flags for namenodes. 69 */ 70 #define NMNMNT 0x01 /* namenode not mounted */ 71 72 /* 73 * Macros to convert a vnode to a namenode, and vice versa. 74 */ 75 #define VTONM(vp) ((struct namenode *)((vp)->v_data)) 76 #define NMTOV(nm) ((nm)->nm_vnode) 77 78 #define NM_FILEVP_HASH_SIZE 64 79 #define NM_FILEVP_HASH_MASK (NM_FILEVP_HASH_SIZE - 1) 80 #define NM_FILEVP_HASH_SHIFT 7 81 #define NM_FILEVP_HASH(vp) (&nm_filevp_hash[(((uintptr_t)vp) >> \ 82 NM_FILEVP_HASH_SHIFT) & NM_FILEVP_HASH_MASK]) 83 84 extern struct namenode *nm_filevp_hash[NM_FILEVP_HASH_SIZE]; 85 extern struct vfs namevfs; 86 87 extern int nameinit(int, char *); 88 extern int nm_unmountall(struct vnode *, struct cred *); 89 extern void nameinsert(struct namenode *); 90 extern void nameremove(struct namenode *); 91 extern struct namenode *namefind(struct vnode *, struct vnode *); 92 extern uint64_t namenodeno_alloc(void); 93 extern void namenodeno_free(uint64_t); 94 extern struct vnodeops *nm_vnodeops; 95 extern const struct fs_operation_def nm_vnodeops_template[]; 96 extern kmutex_t ntable_lock; 97 98 #endif /* _KERNEL */ 99 100 #ifdef __cplusplus 101 } 102 #endif 103 104 #endif /* _SYS_FS_NAMENODE_H */ 105