3 .\" Copyright (c) 1996 Doug Rabson
5 .\" All rights reserved.
7 .\" This program is free software.
9 .\" Redistribution and use in source and binary forms, with or without
10 .\" modification, are permitted provided that the following conditions
12 .\" 1. Redistributions of source code must retain the above copyright
13 .\" notice, this list of conditions and the following disclaimer.
14 .\" 2. Redistributions in binary form must reproduce the above copyright
15 .\" notice, this list of conditions and the following disclaimer in the
16 .\" documentation and/or other materials provided with the distribution.
18 .\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
19 .\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 .\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 .\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
22 .\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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29 .\" $FreeBSD: src/share/man/man9/VOP_FSYNC.9,v 1.6.2.2 2001/12/17 11:30:18 ru Exp $
30 .\" $DragonFly: src/share/man/man9/VOP_FSYNC.9,v 1.3 2003/08/01 17:46:25 dillon Exp $
37 .Nd flush filesystem buffers for a file
42 .Fn VOP_FSYNC "struct vnode *vp" "struct ucred *cred" "int waitfor" "struct proc *p"
44 This call flushes any dirty filesystem buffers for the file.
45 It is used to implement the
52 .Bl -tag -width waitfor
56 the caller's credentials
58 whether the function should wait for I/O to complete
69 and specifies whether or not the function should wait for the writes
70 to finish before returning.
72 The file should be locked on entry.
74 Zero is returned if the call is successful, otherwise an appropriate
75 error code is returned.
79 vop_fsync(struct vnode *vp, struct ucred *cred, int waitfor, struct proc *p)
88 for (bp = vp->v_dirtyblkhd.lh_first; bp; bp = nbp) {
89 nbp = bp->b_vnbufs.le_next;
92 * Ignore buffers which are already being written.
94 if (bp->b_flags & B_BUSY)
98 * Make sure the buffer is dirty.
100 if ((bp->b_flags & B_DELWRI) == 0)
101 panic("vop_fsync: not dirty");
109 if (waitfor == MNT_WAIT) {
111 while (vp->v_numoutput) {
112 vp->v_flag |= VBWAIT;
113 tsleep((caddr_t)&vp->v_numoutput, 0, "vopfsn");
117 if (vp->v_dirtyblkhd.lh_first) {
118 vprint("vop_fsync: dirty", vp);
125 * Write out the on-disc version of the vnode.
128 return VOP_UPDATE(vp, &tv, &tv, waitfor == MNT_WAIT);
134 The filesystem is full.
141 This man page was written by