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/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  *      @(#)nfsnode.h   8.9 (Berkeley) 5/14/95
   33  * $FreeBSD: releng/10.4/sys/nfsclient/nfsnode.h 235332 2012-05-12 12:02:51Z rmacklem $
   34  */
   35 
   36 #ifndef _NFSCLIENT_NFSNODE_H_
   37 #define _NFSCLIENT_NFSNODE_H_
   38 
   39 #include <sys/_task.h>
   40 #if !defined(_NFSCLIENT_NFS_H_) && !defined(_KERNEL)
   41 #include <nfs/nfs.h>
   42 #endif
   43 
   44 /*
   45  * Silly rename structure that hangs off the nfsnode until the name
   46  * can be removed by nfs_inactive()
   47  */
   48 struct sillyrename {
   49         struct  task s_task;
   50         struct  ucred *s_cred;
   51         struct  vnode *s_dvp;
   52         int     (*s_removeit)(struct sillyrename *sp);
   53         long    s_namlen;
   54         char    s_name[32];
   55 };
   56 
   57 /*
   58  * This structure is used to save the logical directory offset to
   59  * NFS cookie mappings.
   60  * The mappings are stored in a list headed
   61  * by n_cookies, as required.
   62  * There is one mapping for each NFS_DIRBLKSIZ bytes of directory information
   63  * stored in increasing logical offset byte order.
   64  */
   65 #define NFSNUMCOOKIES           31
   66 
   67 struct nfsdmap {
   68         LIST_ENTRY(nfsdmap)     ndm_list;
   69         int                     ndm_eocookie;
   70         union {
   71                 nfsuint64       ndmu3_cookies[NFSNUMCOOKIES];
   72                 uint64_t        ndmu4_cookies[NFSNUMCOOKIES];
   73         } ndm_un1;
   74 };
   75 
   76 #define ndm_cookies     ndm_un1.ndmu3_cookies
   77 #define ndm4_cookies    ndm_un1.ndmu4_cookies
   78 
   79 struct nfs_accesscache {
   80         u_int32_t               mode;           /* ACCESS mode cache */
   81         uid_t                   uid;            /* credentials having mode */
   82         time_t                  stamp;          /* mode cache timestamp */
   83 };
   84         
   85 /*
   86  * The nfsnode is the nfs equivalent to ufs's inode. Any similarity
   87  * is purely coincidental.
   88  * There is a unique nfsnode allocated for each active file,
   89  * each current directory, each mounted-on file, text file, and the root.
   90  * An nfsnode is 'named' by its file handle. (nget/nfs_node.c)
   91  * If this structure exceeds 256 bytes (it is currently 256 using 4.4BSD-Lite
   92  * type definitions), file handles of > 32 bytes should probably be split out
   93  * into a separate MALLOC()'d data structure. (Reduce the size of nfsfh_t by
   94  * changing the definition in nfsproto.h of NFS_SMALLFH.)
   95  * NB: Hopefully the current order of the fields is such that everything will
   96  *     be well aligned and, therefore, tightly packed.
   97  */
   98 struct nfsnode {
   99         struct mtx              n_mtx;          /* Protects all of these members */
  100         u_quad_t                n_size;         /* Current size of file */
  101         u_quad_t                n_brev;         /* Modify rev when cached */
  102         u_quad_t                n_lrev;         /* Modify rev for lease */
  103         struct vattr            n_vattr;        /* Vnode attribute cache */
  104         time_t                  n_attrstamp;    /* Attr. cache timestamp */
  105         struct nfs_accesscache  n_accesscache[NFS_ACCESSCACHESIZE];
  106         struct timespec         n_mtime;        /* Prev modify time. */
  107         nfsfh_t                 *n_fhp;         /* NFS File Handle */
  108         struct vnode            *n_vnode;       /* associated vnode */
  109         struct vnode            *n_dvp;         /* parent vnode */
  110         int                     n_error;        /* Save write error value */
  111         union {
  112                 struct timespec nf_atim;        /* Special file times */
  113                 nfsuint64       nd_cookieverf;  /* Cookie verifier (dir only) */
  114                 u_char          nd4_cookieverf[NFSX_V4VERF];
  115         } n_un1;
  116         union {
  117                 struct timespec nf_mtim;
  118                 off_t           nd_direof;      /* Dir. EOF offset cache */
  119         } n_un2;
  120         union {
  121                 struct sillyrename *nf_silly;   /* Ptr to silly rename struct */
  122                 LIST_HEAD(, nfsdmap) nd_cook;   /* cookies */
  123         } n_un3;
  124         short                   n_fhsize;       /* size in bytes, of fh */
  125         short                   n_flag;         /* Flag for locking.. */
  126         nfsfh_t                 n_fh;           /* Small File Handle */
  127         u_char                  *n_name;        /* leaf name, for v4 OPEN op */
  128         uint32_t                n_namelen;
  129         int                     n_directio_opens;
  130         int                     n_directio_asyncwr;
  131         struct ucred            *n_writecred;   /* Cred. for putpages */
  132 };
  133 
  134 #define n_atim          n_un1.nf_atim
  135 #define n_mtim          n_un2.nf_mtim
  136 #define n_sillyrename   n_un3.nf_silly
  137 #define n_cookieverf    n_un1.nd_cookieverf
  138 #define n4_cookieverf   n_un1.nd4_cookieverf
  139 #define n_direofoffset  n_un2.nd_direof
  140 #define n_cookies       n_un3.nd_cook
  141 
  142 /*
  143  * Flags for n_flag
  144  */
  145 #define NFSYNCWAIT      0x0002  /* fsync waiting for all directio async writes
  146                                   to drain */
  147 #define NMODIFIED       0x0004  /* Might have a modified buffer in bio */
  148 #define NWRITEERR       0x0008  /* Flag write errors so close will know */
  149 /* 0x20, 0x40, 0x80 free */
  150 #define NACC            0x0100  /* Special file accessed */
  151 #define NUPD            0x0200  /* Special file updated */
  152 #define NCHG            0x0400  /* Special file times changed */
  153 #define NCREATED        0x0800  /* Opened by nfs_create() */
  154 #define NTRUNCATE       0x1000  /* Opened by nfs_setattr() */
  155 #define NSIZECHANGED    0x2000  /* File size has changed: need cache inval */
  156 #define NNONCACHE       0x4000  /* Node marked as noncacheable */
  157 #define NDIRCOOKIELK    0x8000  /* Lock to serialize access to directory cookies */
  158 
  159 /*
  160  * Convert between nfsnode pointers and vnode pointers
  161  */
  162 #define VTONFS(vp)      ((struct nfsnode *)(vp)->v_data)
  163 #define NFSTOV(np)      ((struct vnode *)(np)->n_vnode)
  164 
  165 #define NFS_TIMESPEC_COMPARE(T1, T2)    (((T1)->tv_sec != (T2)->tv_sec) || ((T1)->tv_nsec != (T2)->tv_nsec))
  166 
  167 /*
  168  * NFS iod threads can be in one of these two states once spawned.
  169  * NFSIOD_NOT_AVAILABLE - Cannot be assigned an I/O operation at this time.
  170  * NFSIOD_AVAILABLE - Available to be assigned an I/O operation.
  171  */
  172 enum nfsiod_state {
  173         NFSIOD_NOT_AVAILABLE = 0,
  174         NFSIOD_AVAILABLE = 1,
  175 };
  176 
  177 /*
  178  * Queue head for nfsiod's
  179  */
  180 extern TAILQ_HEAD(nfs_bufq, buf) nfs_bufq;
  181 extern enum nfsiod_state nfs_iodwant[NFS_MAXASYNCDAEMON];
  182 extern struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON];
  183 
  184 #if defined(_KERNEL)
  185 
  186 extern  struct vop_vector       nfs_fifoops;
  187 extern  struct vop_vector       nfs_vnodeops;
  188 extern struct buf_ops buf_ops_nfs;
  189 
  190 /*
  191  * Prototypes for NFS vnode operations
  192  */
  193 int     nfs_getpages(struct vop_getpages_args *);
  194 int     nfs_putpages(struct vop_putpages_args *);
  195 int     nfs_write(struct vop_write_args *);
  196 int     nfs_inactive(struct vop_inactive_args *);
  197 int     nfs_reclaim(struct vop_reclaim_args *);
  198 
  199 /* other stuff */
  200 int     nfs_removeit(struct sillyrename *);
  201 int     nfs_nget(struct mount *, nfsfh_t *, int, struct nfsnode **, int flags);
  202 nfsuint64 *nfs_getcookie(struct nfsnode *, off_t, int);
  203 void    nfs_invaldir(struct vnode *);
  204 int     nfs_upgrade_vnlock(struct vnode *vp);
  205 void    nfs_downgrade_vnlock(struct vnode *vp, int old_lock);
  206 void    nfs_printf(const char *fmt, ...);
  207 
  208 void nfs_dircookie_lock(struct nfsnode *np);
  209 void nfs_dircookie_unlock(struct nfsnode *np);
  210 
  211 #endif /* _KERNEL */
  212 
  213 #endif

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