1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rick Macklem at The University of Guelph. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)nfsnode.h 8.9 (Berkeley) 5/14/95 37 * $FreeBSD: /repoman/r/ncvs/src/sys/nfsclient/nfsnode.h,v 1.43 2004/04/14 23:23:55 peadar Exp $ 38 * $DragonFly: src/sys/vfs/nfs/nfsnode.h,v 1.12 2004/08/28 19:02:20 dillon Exp $ 39 */ 40 41 42 #ifndef _NFS_NFSNODE_H_ 43 #define _NFS_NFSNODE_H_ 44 45 #if !defined(_NFS_NFS_H_) && !defined(_KERNEL) 46 #include "nfs.h" 47 #endif 48 49 #include <sys/lockf.h> 50 51 /* 52 * Silly rename structure that hangs off the nfsnode until the name 53 * can be removed by nfs_inactive() 54 */ 55 struct sillyrename { 56 struct ucred *s_cred; 57 struct vnode *s_dvp; 58 long s_namlen; 59 char s_name[20]; 60 }; 61 62 /* 63 * This structure is used to save the logical directory offset to 64 * NFS cookie mappings. 65 * The mappings are stored in a list headed 66 * by n_cookies, as required. 67 * There is one mapping for each NFS_DIRBLKSIZ bytes of directory information 68 * stored in increasing logical offset byte order. 69 */ 70 #define NFSNUMCOOKIES 31 71 72 struct nfsdmap { 73 LIST_ENTRY(nfsdmap) ndm_list; 74 int ndm_eocookie; 75 nfsuint64 ndm_cookies[NFSNUMCOOKIES]; 76 }; 77 78 /* 79 * The nfsnode is the nfs equivalent to ufs's inode. Any similarity 80 * is purely coincidental. There is a unique nfsnode allocated for 81 * each active file, each current directory, each mounted-on file, 82 * text file, and the root. 83 * 84 * An nfsnode is 'named' by its file handle. (nget/nfs_node.c) 85 * 86 * File handles are accessed via n_fhp, which will point to n_fh if the 87 * file handle is small enough (<= NFS_SMALLFH). Otherwise the file handle 88 * will be allocated. 89 * 90 * DragonFly does not pass ucreds to read and write operations, since such 91 * operations are not possible unless the ucred has already been validated. 92 * Validating ucreds are stored in nfsnode to pass on to NFS read/write RPCs. 93 */ 94 struct nfsnode { 95 LIST_ENTRY(nfsnode) n_hash; /* Hash chain */ 96 CIRCLEQ_ENTRY(nfsnode) n_timer; /* Nqnfs timer chain */ 97 u_quad_t n_size; /* Current size of file */ 98 u_quad_t n_brev; /* Modify rev when cached */ 99 u_quad_t n_lrev; /* Modify rev for lease */ 100 struct vattr n_vattr; /* Vnode attribute cache */ 101 time_t n_attrstamp; /* Attr. cache timestamp */ 102 u_int32_t n_mode; /* ACCESS mode cache */ 103 uid_t n_modeuid; /* credentials having mode */ 104 time_t n_modestamp; /* mode cache timestamp */ 105 time_t n_mtime; /* Prev modify time. */ 106 time_t n_ctime; /* Prev create time. */ 107 time_t n_expiry; /* Lease expiry time */ 108 nfsfh_t *n_fhp; /* NFS File Handle */ 109 struct ucred *n_rucred; 110 struct ucred *n_wucred; 111 struct vnode *n_vnode; /* associated vnode */ 112 struct lockf n_lockf; /* Locking record of file */ 113 int n_error; /* Save write error value */ 114 union { 115 struct timespec nf_atim; /* Special file times */ 116 nfsuint64 nd_cookieverf; /* Cookie verifier (dir only) */ 117 } n_un1; 118 union { 119 struct timespec nf_mtim; 120 off_t nd_direof; /* Dir. EOF offset cache */ 121 } n_un2; 122 union { 123 struct sillyrename *nf_silly; /* Ptr to silly rename struct */ 124 LIST_HEAD(, nfsdmap) nd_cook; /* cookies */ 125 } n_un3; 126 short n_fhsize; /* size in bytes, of fh */ 127 short n_flag; /* Flag for locking.. */ 128 nfsfh_t n_fh; /* Small File Handle */ 129 struct lock n_rslock; 130 }; 131 132 #define n_atim n_un1.nf_atim 133 #define n_mtim n_un2.nf_mtim 134 #define n_sillyrename n_un3.nf_silly 135 #define n_cookieverf n_un1.nd_cookieverf 136 #define n_direofoffset n_un2.nd_direof 137 #define n_cookies n_un3.nd_cook 138 139 /* 140 * Flags for n_flag 141 */ 142 #define NFLUSHWANT 0x0001 /* Want wakeup from a flush in prog. */ 143 #define NFLUSHINPROG 0x0002 /* Avoid multiple calls to vinvalbuf() */ 144 #define NMODIFIED 0x0004 /* Might have a modified buffer in bio */ 145 #define NWRITEERR 0x0008 /* Flag write errors so close will know */ 146 #define NQNFSNONCACHE 0x0020 /* Non-cachable lease */ 147 #define NQNFSWRITE 0x0040 /* Write lease */ 148 #define NQNFSEVICTED 0x0080 /* Has been evicted */ 149 #define NACC 0x0100 /* Special file accessed */ 150 #define NUPD 0x0200 /* Special file updated */ 151 #define NCHG 0x0400 /* Special file times changed */ 152 #define NLOCKED 0x0800 /* node is locked */ 153 #define NWANTED 0x0100 /* someone wants to lock */ 154 #define NSIZECHANGED 0x2000 /* File size has changed: need cache inval */ 155 156 /* 157 * Convert between nfsnode pointers and vnode pointers 158 */ 159 #define VTONFS(vp) ((struct nfsnode *)(vp)->v_data) 160 #define NFSTOV(np) ((struct vnode *)(np)->n_vnode) 161 162 /* 163 * Queue head for nfsiod's 164 */ 165 extern TAILQ_HEAD(nfs_bufq, buf) nfs_bufq; 166 extern struct thread *nfs_iodwant[NFS_MAXASYNCDAEMON]; 167 extern struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON]; 168 169 #if defined(_KERNEL) 170 171 /* 172 * nfs_rslock - Attempt to obtain lock on nfsnode 173 * 174 * Attempt to obtain a lock on the passed nfsnode, returning ENOLCK 175 * if the lock could not be obtained due to our having to sleep. This 176 * function is generally used to lock around code that modifies an 177 * NFS file's size. In order to avoid deadlocks the lock 178 * should not be obtained while other locks are being held. 179 */ 180 181 static __inline 182 int 183 nfs_rslock(struct nfsnode *np, struct thread *td) 184 { 185 return(lockmgr(&np->n_rslock, LK_EXCLUSIVE | LK_CANRECURSE | 186 LK_SLEEPFAIL, NULL, td)); 187 } 188 189 static __inline 190 void 191 nfs_rsunlock(struct nfsnode *np, struct thread *td) 192 { 193 (void)lockmgr(&np->n_rslock, LK_RELEASE, NULL, td); 194 } 195 196 static __inline 197 struct ucred * 198 nfs_vpcred(struct vnode *vp, int ndflag) 199 { 200 struct nfsnode *np = VTONFS(vp); 201 202 if (np && (ndflag & ND_WRITE) && np->n_wucred) 203 return(np->n_wucred); 204 if (np && (ndflag & ND_READ) && np->n_rucred) 205 return(np->n_rucred); 206 return(VFSTONFS((vp)->v_mount)->nm_cred); 207 } 208 209 /* 210 * Prototypes for NFS vnode operations 211 */ 212 int nfs_getpages (struct vop_getpages_args *); 213 int nfs_putpages (struct vop_putpages_args *); 214 int nfs_write (struct vop_write_args *); 215 int nqnfs_vop_lease_check (struct vop_lease_args *); 216 int nfs_inactive (struct vop_inactive_args *); 217 int nfs_reclaim (struct vop_reclaim_args *); 218 219 /* other stuff */ 220 int nfs_removeit (struct sillyrename *); 221 int nfs_nget (struct mount *,nfsfh_t *,int,struct nfsnode **); 222 nfsuint64 *nfs_getcookie (struct nfsnode *, off_t, int); 223 void nfs_invaldir (struct vnode *); 224 225 #define nqnfs_lease_updatetime nfs_lease_updatetime 226 227 #endif /* _KERNEL */ 228 229 #endif 230