sys/vfs/nfs/nfsnode.h

   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 1.18 2006/05/06 16:01:21 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  * Entries of directories in the buffer cache.
  64  */
  65 struct nfs_dirent {
  66         ino_t           nfs_ino;        /* file number of entry */
  67         uint16_t        nfs_namlen;     /* strlen(d_name) */
  68         uint16_t        nfs_reclen;     /* total record length */
  69         uint8_t         nfs_type;       /* file type */
  70         uint8_t         nfs_padding1;
  71         uint8_t         nfs_padding2;
  72         uint8_t         nfs_padding3;
  73         char            nfs_name[];     /* name, NUL-terminated */
  74 };
  75
  76 /*
  77  * This structure is used to save the logical directory offset to
  78  * NFS cookie mappings.
  79  * The mappings are stored in a list headed
  80  * by n_cookies, as required.
  81  * There is one mapping for each NFS_DIRBLKSIZ bytes of directory information
  82  * stored in increasing logical offset byte order.
  83  */
  84 #define NFSNUMCOOKIES           31
  85
  86 struct nfsdmap {
  87         LIST_ENTRY(nfsdmap)     ndm_list;
  88         int                     ndm_eocookie;
  89         nfsuint64               ndm_cookies[NFSNUMCOOKIES];
  90 };
  91
  92 /*
  93  * The nfsnode is the nfs equivalent to ufs's inode. Any similarity
  94  * is purely coincidental.  There is a unique nfsnode allocated for
  95  * each active file, each current directory, each mounted-on file,
  96  * text file, and the root.
  97  *
  98  * An nfsnode is 'named' by its file handle. (nget/nfs_node.c)
  99  *
 100  * File handles are accessed via n_fhp, which will point to n_fh if the
 101  * file handle is small enough (<= NFS_SMALLFH).  Otherwise the file handle
 102  * will be allocated.
 103  *
 104  * DragonFly does not pass ucreds to read and write operations, since such
 105  * operations are not possible unless the ucred has already been validated.
 106  * Validating ucreds are stored in nfsnode to pass on to NFS read/write RPCs.
 107  */
 108 struct nfsnode {
 109         LIST_ENTRY(nfsnode)     n_hash;         /* Hash chain */
 110         u_quad_t                n_size;         /* Current size of file */
 111         u_quad_t                n_brev;         /* Modify rev when cached */
 112         struct vattr            n_vattr;        /* Vnode attribute cache */
 113         time_t                  n_attrstamp;    /* Attr. cache timestamp */
 114         u_int32_t               n_mode;         /* ACCESS mode cache */
 115         uid_t                   n_modeuid;      /* credentials having mode */
 116         time_t                  n_modestamp;    /* mode cache timestamp */
 117         time_t                  n_mtime;        /* Last known modified time */
 118         time_t                  n_ctime;        /* Prev create time. */
 119         time_t                  n_expiry;       /* Lease expiry time */
 120         nfsfh_t                 *n_fhp;         /* NFS File Handle */
 121         struct ucred            *n_rucred;
 122         struct ucred            *n_wucred;
 123         struct vnode            *n_vnode;       /* associated vnode */
 124         struct lockf            n_lockf;        /* Locking record of file */
 125         int                     n_error;        /* Save write error value */
 126         union {
 127                 struct timespec nf_atim;        /* Special file times */
 128                 nfsuint64       nd_cookieverf;  /* Cookie verifier (dir only) */
 129         } n_un1;
 130         union {
 131                 struct timespec nf_mtim;
 132                 off_t           nd_direof;      /* Dir. EOF offset cache */
 133         } n_un2;
 134         union {
 135                 struct sillyrename *nf_silly;   /* Ptr to silly rename struct */
 136                 LIST_HEAD(, nfsdmap) nd_cook;   /* cookies */
 137         } n_un3;
 138         short                   n_fhsize;       /* size in bytes, of fh */
 139         short                   n_flag;         /* Flag for locking.. */
 140         nfsfh_t                 n_fh;           /* Small File Handle */
 141         struct lock             n_rslock;
 142 };
 143
 144 #define n_atim          n_un1.nf_atim
 145 #define n_mtim          n_un2.nf_mtim
 146 #define n_sillyrename   n_un3.nf_silly
 147 #define n_cookieverf    n_un1.nd_cookieverf
 148 #define n_direofoffset  n_un2.nd_direof
 149 #define n_cookies       n_un3.nd_cook
 150
 151 /*
 152  * Flags for n_flag
 153  */
 154 #define NFLUSHWANT      0x0001  /* Want wakeup from a flush in prog. */
 155 #define NFLUSHINPROG    0x0002  /* Avoid multiple calls to vinvalbuf() */
 156 #define NLMODIFIED      0x0004  /* Client has pending modifications */
 157 #define NWRITEERR       0x0008  /* Flag write errors so close will know */
 158 #define NDONTCACHE      0x0020  /* Non-cachable */
 159 #define NUNUSED040      0x0040
 160 #define NQNFSEVICTED    0x0080  /* Has been evicted */
 161 #define NACC            0x0100  /* Special file accessed */
 162 #define NUPD            0x0200  /* Special file updated */
 163 #define NCHG            0x0400  /* Special file times changed */
 164 #define NLOCKED         0x0800  /* node is locked */
 165 #define NWANTED         0x0100  /* someone wants to lock */
 166 #define NRMODIFIED      0x2000  /* Server has unsynchronized modifications */
 167
 168 /*
 169  * Convert between nfsnode pointers and vnode pointers
 170  */
 171 #define VTONFS(vp)      ((struct nfsnode *)(vp)->v_data)
 172 #define NFSTOV(np)      ((struct vnode *)(np)->n_vnode)
 173
 174 /*
 175  * Queue head for nfsiod's
 176  */
 177 extern TAILQ_HEAD(nfs_bufq, buf) nfs_bufq;
 178 extern struct thread *nfs_iodwant[NFS_MAXASYNCDAEMON];
 179 extern struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON];
 180
 181 #if defined(_KERNEL)
 182
 183 /*
 184  *      nfs_rslock -    Attempt to obtain lock on nfsnode
 185  *
 186  *      Attempt to obtain a lock on the passed nfsnode, returning ENOLCK
 187  *      if the lock could not be obtained due to our having to sleep.  This
 188  *      function is generally used to lock around code that modifies an
 189  *      NFS file's size.  In order to avoid deadlocks the lock
 190  *      should not be obtained while other locks are being held.
 191  */
 192
 193 static __inline
 194 int
 195 nfs_rslock(struct nfsnode *np)
 196 {
 197         return(lockmgr(&np->n_rslock, LK_EXCLUSIVE | LK_CANRECURSE |
 198                        LK_SLEEPFAIL));
 199 }
 200
 201 static __inline
 202 void
 203 nfs_rsunlock(struct nfsnode *np)
 204 {
 205         lockmgr(&np->n_rslock, LK_RELEASE);
 206 }
 207
 208 static __inline
 209 struct ucred *
 210 nfs_vpcred(struct vnode *vp, int ndflag)
 211 {
 212         struct nfsnode *np = VTONFS(vp);
 213
 214         if (np && (ndflag & ND_WRITE) && np->n_wucred)
 215                 return(np->n_wucred);
 216         if (np && (ndflag & ND_READ) && np->n_rucred)
 217                 return(np->n_rucred);
 218         return(VFSTONFS((vp)->v_mount)->nm_cred);
 219 }
 220
 221 /*
 222  * Prototypes for NFS vnode operations
 223  */
 224 int     nfs_getpages (struct vop_getpages_args *);
 225 int     nfs_putpages (struct vop_putpages_args *);
 226 int     nfs_write (struct vop_write_args *);
 227 int     nfs_inactive (struct vop_inactive_args *);
 228 int     nfs_reclaim (struct vop_reclaim_args *);
 229 int     nfs_flush (struct vnode *, int, struct thread *, int);
 230
 231 /* other stuff */
 232 int     nfs_removeit (struct sillyrename *);
 233 int     nfs_nget (struct mount *,nfsfh_t *,int,struct nfsnode **);
 234 nfsuint64 *nfs_getcookie (struct nfsnode *, off_t, int);
 235 void    nfs_invaldir (struct vnode *);
 236
 237 #endif /* _KERNEL */
 238
 239 #endif