The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/nfsclient/nfsnode.h

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    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  * 4. 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  * $FreeBSD: releng/8.3/sys/fs/nfsclient/nfsnode.h 224951 2011-08-17 20:55:56Z rmacklem $
   33  */
   34 
   35 #ifndef _NFSCLIENT_NFSNODE_H_
   36 #define _NFSCLIENT_NFSNODE_H_
   37 
   38 #include <sys/_task.h>
   39 
   40 /*
   41  * Silly rename structure that hangs off the nfsnode until the name
   42  * can be removed by nfs_inactive()
   43  */
   44 struct sillyrename {
   45         struct  task s_task;
   46         struct  ucred *s_cred;
   47         struct  vnode *s_dvp;
   48         long    s_namlen;
   49         char    s_name[32];
   50 };
   51 
   52 /*
   53  * This structure is used to save the logical directory offset to
   54  * NFS cookie mappings.
   55  * The mappings are stored in a list headed
   56  * by n_cookies, as required.
   57  * There is one mapping for each NFS_DIRBLKSIZ bytes of directory information
   58  * stored in increasing logical offset byte order.
   59  */
   60 #define NFSNUMCOOKIES           31
   61 
   62 struct nfsdmap {
   63         LIST_ENTRY(nfsdmap)     ndm_list;
   64         int                     ndm_eocookie;
   65         union {
   66                 nfsuint64       ndmu3_cookies[NFSNUMCOOKIES];
   67                 uint64_t        ndmu4_cookies[NFSNUMCOOKIES];
   68         } ndm_un1;
   69 };
   70 
   71 #define ndm_cookies     ndm_un1.ndmu3_cookies
   72 #define ndm4_cookies    ndm_un1.ndmu4_cookies
   73 
   74 struct nfs_attrcache_timestamp {
   75         lwpid_t         nfs_ac_ts_tid;
   76         pid_t           nfs_ac_ts_pid;
   77         unsigned long   nfs_ac_ts_syscalls;     
   78 };
   79 
   80 struct nfs_accesscache {
   81         u_int32_t               mode;   /* ACCESS mode cache */
   82         uid_t                   uid;    /* credentials having mode */
   83         time_t                  stamp;  /* mode cache timestamp */
   84 };
   85 
   86 /*
   87  * The nfsnode is the nfs equivalent to ufs's inode. Any similarity
   88  * is purely coincidental.
   89  * There is a unique nfsnode allocated for each active file,
   90  * each current directory, each mounted-on file, text file, and the root.
   91  * An nfsnode is 'named' by its file handle. (nget/nfs_node.c)
   92  * If this structure exceeds 256 bytes (it is currently 256 using 4.4BSD-Lite
   93  * type definitions), file handles of > 32 bytes should probably be split out
   94  * into a separate MALLOC()'d data structure. (Reduce the size of nfsfh_t by
   95  * changing the definition in nfsproto.h of NFS_SMALLFH.)
   96  * NB: Hopefully the current order of the fields is such that everything will
   97  *     be well aligned and, therefore, tightly packed.
   98  */
   99 struct nfsnode {
  100         struct mtx              n_mtx;          /* Protects all of these members */
  101         u_quad_t                n_size;         /* Current size of file */
  102         u_quad_t                n_brev;         /* Modify rev when cached */
  103         u_quad_t                n_lrev;         /* Modify rev for lease */
  104         struct nfsvattr         n_vattr;        /* Vnode attribute cache */
  105         time_t                  n_attrstamp;    /* Attr. cache timestamp */
  106         struct nfs_accesscache  n_accesscache[NFS_ACCESSCACHESIZE];
  107         struct timespec         n_mtime;        /* Prev modify time. */
  108         time_t                  n_unused0;
  109         time_t                  n_unused1;
  110         int                     n_dmtime_ticks; /* Tick of -ve cache entry */
  111         time_t                  n_unused2;
  112         struct nfsfh            *n_fhp;         /* NFS File Handle */
  113         struct vnode            *n_vnode;       /* associated vnode */
  114         struct vnode            *n_dvp;         /* parent vnode */
  115         struct lockf            *n_lockf;       /* Locking record of file */
  116         int                     n_error;        /* Save write error value */
  117         union {
  118                 struct timespec nf_atim;        /* Special file times */
  119                 nfsuint64       nd_cookieverf;  /* Cookie verifier (dir only) */
  120                 u_char          nd4_cookieverf[NFSX_VERF];
  121         } n_un1;
  122         union {
  123                 struct timespec nf_mtim;
  124                 off_t           nd_direof;      /* Dir. EOF offset cache */
  125         } n_un2;
  126         union {
  127                 struct sillyrename *nf_silly;   /* Ptr to silly rename struct */
  128                 LIST_HEAD(, nfsdmap) nd_cook;   /* cookies */
  129         } n_un3;
  130         short                   n_fhsize;       /* size in bytes, of fh */
  131         u_int32_t               n_flag;         /* Flag for locking.. */
  132         int                     n_directio_opens;
  133         int                     n_directio_asyncwr;
  134         struct nfs_attrcache_timestamp n_unused;
  135         u_int64_t                n_change;      /* old Change attribute */
  136         struct nfsv4node        *n_v4;          /* extra V4 stuff */
  137         struct timespec         n_ctime;        /* Prev create time. */
  138         struct timespec         n_dmtime;       /* Prev dir modify time. */
  139 };
  140 
  141 #define n_atim          n_un1.nf_atim
  142 #define n_mtim          n_un2.nf_mtim
  143 #define n_sillyrename   n_un3.nf_silly
  144 #define n_cookieverf    n_un1.nd_cookieverf
  145 #define n4_cookieverf   n_un1.nd4_cookieverf
  146 #define n_direofoffset  n_un2.nd_direof
  147 #define n_cookies       n_un3.nd_cook
  148 
  149 /*
  150  * Flags for n_flag
  151  */
  152 #define NDIRCOOKIELK    0x00000001  /* Lock to serialize access to directory cookies */
  153 #define NFSYNCWAIT      0x00000002  /* fsync waiting for all directio async
  154                                   writes to drain */
  155 #define NMODIFIED       0x00000004  /* Might have a modified buffer in bio */
  156 #define NWRITEERR       0x00000008  /* Flag write errors so close will know */
  157 #define NCREATED        0x00000010  /* Opened by nfs_create() */
  158 #define NTRUNCATE       0x00000020  /* Opened by nfs_setattr() */
  159 #define NSIZECHANGED    0x00000040  /* File size has changed: need cache inval */
  160 #define NNONCACHE       0x00000080  /* Node marked as noncacheable */
  161 #define NACC            0x00000100  /* Special file accessed */
  162 #define NUPD            0x00000200  /* Special file updated */
  163 #define NCHG            0x00000400  /* Special file times changed */
  164 #define NDELEGMOD       0x00000800  /* Modified delegation */
  165 #define NDELEGRECALL    0x00001000  /* Recall in progress */
  166 #define NREMOVEINPROG   0x00002000  /* Remove in progress */
  167 #define NREMOVEWANT     0x00004000  /* Want notification that remove is done */
  168 #define NLOCK           0x00008000  /* Sleep lock the node */
  169 #define NLOCKWANT       0x00010000  /* Want the sleep lock */
  170 
  171 /*
  172  * Convert between nfsnode pointers and vnode pointers
  173  */
  174 #define VTONFS(vp)      ((struct nfsnode *)(vp)->v_data)
  175 #define NFSTOV(np)      ((struct vnode *)(np)->n_vnode)
  176 
  177 #define NFS_TIMESPEC_COMPARE(T1, T2)    (((T1)->tv_sec != (T2)->tv_sec) || ((T1)->tv_nsec != (T2)->tv_nsec))
  178 
  179 #if defined(_KERNEL)
  180 
  181 /*
  182  * Prototypes for NFS vnode operations
  183  */
  184 int     ncl_getpages(struct vop_getpages_args *);
  185 int     ncl_putpages(struct vop_putpages_args *);
  186 int     ncl_write(struct vop_write_args *);
  187 int     ncl_inactive(struct vop_inactive_args *);
  188 int     ncl_reclaim(struct vop_reclaim_args *);
  189 
  190 /* other stuff */
  191 int     ncl_removeit(struct sillyrename *, struct vnode *);
  192 int     ncl_nget(struct mount *, u_int8_t *, int, struct nfsnode **, int);
  193 nfsuint64 *ncl_getcookie(struct nfsnode *, off_t, int);
  194 void    ncl_invaldir(struct vnode *);
  195 int     ncl_upgrade_vnlock(struct vnode *);
  196 void    ncl_downgrade_vnlock(struct vnode *, int);
  197 void    ncl_printf(const char *, ...);
  198 void    ncl_dircookie_lock(struct nfsnode *);
  199 void    ncl_dircookie_unlock(struct nfsnode *);
  200 
  201 #endif /* _KERNEL */
  202 
  203 #endif  /* _NFSCLIENT_NFSNODE_H_ */

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