sys/vfs/ufs/ffs_vnops.c

   1 /*
   2  * Copyright (c) 1982, 1986, 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)ffs_vnops.c 8.15 (Berkeley) 5/14/95
  34  * $FreeBSD: src/sys/ufs/ffs/ffs_vnops.c,v 1.64 2000/01/10 12:04:25 phk Exp $
  35  * $DragonFly: src/sys/vfs/ufs/ffs_vnops.c,v 1.19 2007/11/06 03:50:02 dillon Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/systm.h>
  40 #include <sys/resourcevar.h>
  41 #include <sys/signalvar.h>
  42 #include <sys/kernel.h>
  43 #include <sys/stat.h>
  44 #include <sys/buf.h>
  45 #include <sys/proc.h>
  46 #include <sys/mount.h>
  47 #include <sys/vnode.h>
  48 #include <sys/conf.h>
  49
  50 #include <machine/limits.h>
  51
  52 #include <vm/vm.h>
  53 #include <vm/vm_page.h>
  54 #include <vm/vm_object.h>
  55 #include <vm/vm_extern.h>
  56
  57 #include <sys/buf2.h>
  58
  59 #include "quota.h"
  60 #include "inode.h"
  61 #include "ufsmount.h"
  62 #include "ufs_extern.h"
  63
  64 #include "fs.h"
  65 #include "ffs_extern.h"
  66
  67 static int      ffs_fsync (struct vop_fsync_args *);
  68 static int      ffs_read (struct vop_read_args *);
  69 static int      ffs_write (struct vop_write_args *);
  70
  71 /* Global vfs data structures for ufs. */
  72 struct vop_ops ffs_vnode_vops = {
  73         .vop_default =          ufs_vnoperate,
  74         .vop_fsync =            ffs_fsync,
  75         .vop_getpages =         vop_stdgetpages,
  76         .vop_putpages =         vop_stdputpages,
  77         .vop_read =             ffs_read,
  78         .vop_balloc =           ffs_balloc,
  79         .vop_reallocblks =      ffs_reallocblks,
  80         .vop_write =            ffs_write
  81 };
  82
  83 struct vop_ops ffs_spec_vops = {
  84         .vop_default =          ufs_vnoperatespec,
  85         .vop_fsync =            ffs_fsync
  86 };
  87
  88 struct vop_ops ffs_fifo_vops = {
  89         .vop_default =          ufs_vnoperatefifo,
  90         .vop_fsync =            ffs_fsync
  91 };
  92
  93 #include "ufs_readwrite.c"
  94
  95 /*
  96  * Synch an open file.
  97  *
  98  * ffs_fsync(struct vnode *a_vp, struct ucred *a_cred, int a_waitfor,
  99  *           struct proc *a_p)
 100  */
 101
 102 static int ffs_checkdeferred(struct buf *bp);
 103
 104 /* ARGSUSED */
 105 static int
 106 ffs_fsync(struct vop_fsync_args *ap)
 107 {
 108         struct vnode *vp = ap->a_vp;
 109         off_t loffset;
 110         int error;
 111
 112         if (vn_isdisk(vp, NULL)) {
 113                 loffset = LLONG_MAX;
 114                 if (vp->v_rdev && vp->v_rdev->si_mountpoint != NULL &&
 115                     (vp->v_rdev->si_mountpoint->mnt_flag & MNT_SOFTDEP))
 116                         softdep_fsync_mountdev(vp);
 117         } else {
 118                 struct inode *ip;
 119                 ip = VTOI(vp);
 120                 loffset = ip->i_size;
 121         }
 122
 123         /*
 124          * Flush all dirty buffers associated with a vnode.
 125          */
 126         error = vfsync(vp, ap->a_waitfor, NIADDR + 1, ffs_checkdeferred,
 127                        softdep_sync_metadata);
 128         if (error == 0)
 129                 error = ffs_update(vp, (ap->a_waitfor == MNT_WAIT));
 130         return (error);
 131 }
 132
 133 static int
 134 ffs_checkdeferred(struct buf *bp)
 135 {
 136         if (LIST_FIRST(&bp->b_dep) != NULL &&
 137             (bp->b_flags & B_DEFERRED) == 0 &&
 138             buf_countdeps(bp, 0)) {
 139                 bp->b_flags |= B_DEFERRED;
 140                 return(1);
 141         }
 142         return(0);
 143 }
 144