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. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  *      @(#)nfsnode.h   8.9 (Berkeley) 5/14/95
  33  * $FreeBSD: /repoman/r/ncvs/src/sys/nfsclient/nfsnode.h,v 1.43 2004/04/14 23:23:55 peadar Exp $
  34  * $DragonFly: src/sys/vfs/nfs/nfsnode.h,v 1.18 2006/05/06 16:01:21 dillon Exp $
  35  */
  36
  37
  38 #ifndef _NFS_NFSNODE_H_
  39 #define _NFS_NFSNODE_H_
  40
  41 #if !defined(_NFS_NFS_H_) && !defined(_KERNEL)
  42 #include "nfs.h"
  43 #endif
  44
  45 #include <sys/lockf.h>
  46
  47 /*
  48  * Silly rename structure that hangs off the nfsnode until the name
  49  * can be removed by nfs_inactive()
  50  */
  51 struct sillyrename {
  52         struct  ucred *s_cred;
  53         struct  vnode *s_dvp;
  54         long    s_namlen;
  55         char    s_name[20];
  56 };
  57
  58 /*
  59  * Entries of directories in the buffer cache.
  60  */
  61 struct nfs_dirent {
  62         ino_t           nfs_ino;        /* file number of entry */
  63         uint16_t        nfs_namlen;     /* strlen(d_name) */
  64         uint16_t        nfs_reclen;     /* total record length */
  65         uint8_t         nfs_type;       /* file type */
  66         uint8_t         nfs_padding1;
  67         uint8_t         nfs_padding2;
  68         uint8_t         nfs_padding3;
  69         char            nfs_name[];     /* name, NUL-terminated */
  70 };
  71
  72 /*
  73  * This structure is used to save the logical directory offset to
  74  * NFS cookie mappings.
  75  * The mappings are stored in a list headed
  76  * by n_cookies, as required.
  77  * There is one mapping for each NFS_DIRBLKSIZ bytes of directory information
  78  * stored in increasing logical offset byte order.
  79  */
  80 #define NFSNUMCOOKIES           31
  81
  82 struct nfsdmap {
  83         LIST_ENTRY(nfsdmap)     ndm_list;
  84         int                     ndm_eocookie;
  85         nfsuint64               ndm_cookies[NFSNUMCOOKIES];
  86 };
  87
  88 /*
  89  * The nfsnode is the nfs equivalent to ufs's inode. Any similarity
  90  * is purely coincidental.  There is a unique nfsnode allocated for
  91  * each active file, each current directory, each mounted-on file,
  92  * text file, and the root.
  93  *
  94  * An nfsnode is 'named' by its file handle. (nget/nfs_node.c)
  95  *
  96  * File handles are accessed via n_fhp, which will point to n_fh if the
  97  * file handle is small enough (<= NFS_SMALLFH).  Otherwise the file handle
  98  * will be allocated.
  99  *
 100  * DragonFly does not pass ucreds to read and write operations, since such
 101  * operations are not possible unless the ucred has already been validated.
 102  * Validating ucreds are stored in nfsnode to pass on to NFS read/write RPCs.
 103  */
 104 struct nfsnode {
 105         LIST_ENTRY(nfsnode)     n_hash;         /* Hash chain */
 106         u_quad_t                n_size;         /* Current size of file */
 107         u_quad_t                n_brev;         /* Modify rev when cached */
 108         struct vattr            n_vattr;        /* Vnode attribute cache */
 109         time_t                  n_attrstamp;    /* Attr. cache timestamp */
 110         u_int32_t               n_mode;         /* ACCESS mode cache */
 111         uid_t                   n_modeuid;      /* credentials having mode */
 112         time_t                  n_modestamp;    /* mode cache timestamp */
 113         time_t                  n_mtime;        /* Last known modified time */
 114         time_t                  n_ctime;        /* Prev create time. */
 115         time_t                  n_expiry;       /* Lease expiry time */
 116         nfsfh_t                 *n_fhp;         /* NFS File Handle */
 117         struct ucred            *n_rucred;
 118         struct ucred            *n_wucred;
 119         struct vnode            *n_vnode;       /* associated vnode */
 120         struct lockf            n_lockf;        /* Locking record of file */
 121         int                     n_error;        /* Save write error value */
 122         union {
 123                 struct timespec nf_atim;        /* Special file times */
 124                 nfsuint64       nd_cookieverf;  /* Cookie verifier (dir only) */
 125         } n_un1;
 126         union {
 127                 struct timespec nf_mtim;
 128                 off_t           nd_direof;      /* Dir. EOF offset cache */
 129         } n_un2;
 130         union {
 131                 struct sillyrename *nf_silly;   /* Ptr to silly rename struct */
 132                 LIST_HEAD(, nfsdmap) nd_cook;   /* cookies */
 133         } n_un3;
 134         short                   n_fhsize;       /* size in bytes, of fh */
 135         short                   n_flag;         /* Flag for locking.. */
 136         nfsfh_t                 n_fh;           /* Small File Handle */
 137         struct lock             n_rslock;
 138 };
 139
 140 #define n_atim          n_un1.nf_atim
 141 #define n_mtim          n_un2.nf_mtim
 142 #define n_sillyrename   n_un3.nf_silly
 143 #define n_cookieverf    n_un1.nd_cookieverf
 144 #define n_direofoffset  n_un2.nd_direof
 145 #define n_cookies       n_un3.nd_cook
 146
 147 /*
 148  * Flags for n_flag
 149  */
 150 #define NFLUSHWANT      0x0001  /* Want wakeup from a flush in prog. */
 151 #define NFLUSHINPROG    0x0002  /* Avoid multiple calls to vinvalbuf() */
 152 #define NLMODIFIED      0x0004  /* Client has pending modifications */
 153 #define NWRITEERR       0x0008  /* Flag write errors so close will know */
 154 #define NREMOVED        0x0020  /* Flag possible removal of file */
 155 #define NUNUSED040      0x0040
 156 #define NQNFSEVICTED    0x0080  /* Has been evicted */
 157 #define NACC            0x0100  /* Special file accessed */
 158 #define NUPD            0x0200  /* Special file updated */
 159 #define NCHG            0x0400  /* Special file times changed */
 160 #define NLOCKED         0x0800  /* node is locked */
 161 #define NWANTED         0x0100  /* someone wants to lock */
 162 #define NRMODIFIED      0x2000  /* Server has unsynchronized modifications */
 163
 164 /*
 165  * Convert between nfsnode pointers and vnode pointers
 166  */
 167 #define VTONFS(vp)      ((struct nfsnode *)(vp)->v_data)
 168 #define NFSTOV(np)      ((struct vnode *)(np)->n_vnode)
 169
 170 /*
 171  * Queue head for nfsiod's
 172  */
 173 extern TAILQ_HEAD(nfs_bufq, buf) nfs_bufq;
 174
 175 #if defined(_KERNEL)
 176
 177 /*
 178  *      nfs_rslock -    Attempt to obtain lock on nfsnode
 179  *
 180  *      Attempt to obtain a lock on the passed nfsnode, returning ENOLCK
 181  *      if the lock could not be obtained due to our having to sleep.  This
 182  *      function is generally used to lock around code that modifies an
 183  *      NFS file's size.  In order to avoid deadlocks the lock
 184  *      should not be obtained while other locks are being held.
 185  */
 186
 187 static __inline
 188 int
 189 nfs_rslock(struct nfsnode *np)
 190 {
 191         return(lockmgr(&np->n_rslock, LK_EXCLUSIVE | LK_CANRECURSE |
 192                        LK_SLEEPFAIL));
 193 }
 194
 195 static __inline
 196 void
 197 nfs_rsunlock(struct nfsnode *np)
 198 {
 199         lockmgr(&np->n_rslock, LK_RELEASE);
 200 }
 201
 202 static __inline
 203 struct ucred *
 204 nfs_vpcred(struct vnode *vp, int ndflag)
 205 {
 206         struct nfsnode *np = VTONFS(vp);
 207
 208         if (np && (ndflag & ND_WRITE) && np->n_wucred)
 209                 return(np->n_wucred);
 210         if (np && (ndflag & ND_READ) && np->n_rucred)
 211                 return(np->n_rucred);
 212         return(VFSTONFS((vp)->v_mount)->nm_cred);
 213 }
 214
 215 /*
 216  * Prototypes for NFS vnode operations
 217  */
 218 int     nfs_write (struct vop_write_args *);
 219 int     nfs_inactive (struct vop_inactive_args *);
 220 int     nfs_reclaim (struct vop_reclaim_args *);
 221 int     nfs_flush (struct vnode *, int, struct thread *, int);
 222
 223 /* other stuff */
 224 int     nfs_removeit (struct sillyrename *);
 225 int     nfs_nget (struct mount *, nfsfh_t *, int,
 226                 struct nfsnode **, struct vnode *);
 227 int     nfs_nget_nonblock (struct mount *, nfsfh_t *, int,
 228                 struct nfsnode **, struct vnode *);
 229 nfsuint64 *nfs_getcookie (struct nfsnode *, off_t, int);
 230 void    nfs_invaldir (struct vnode *);
 231
 232 #endif /* _KERNEL */
 233
 234 #endif