3 .\" Copyright (c) 1996 Doug Rabson
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36 .Nd flush file system buffers for a file
41 .Fn VOP_FSYNC "struct vnode *vp" "struct ucred *cred" "int waitfor" "struct thread *td"
43 This call flushes any dirty file system buffers for the file.
44 It is used to implement the
51 .Bl -tag -width waitfor
53 The vnode of the file.
55 The caller's credentials.
57 Whether the function should wait for I/O to complete.
59 .Bl -tag -width MNT_NOWAIT
61 Synchronously wait for I/O to complete.
63 Start all I/O, but do not wait for it.
65 Push data not written by file system syncer.
77 and specifies whether or not the function should wait for the writes
78 to finish before returning.
80 The file should be locked on entry.
82 Zero is returned if the call is successful, otherwise an appropriate
83 error code is returned.
87 vop_fsync(struct vnode *vp, struct ucred *cred, int waitfor, struct thread *td)
96 for (bp = vp->v_dirtyblkhd.lh_first; bp; bp = nbp) {
97 nbp = bp->b_vnbufs.le_next;
100 * Ignore buffers which are already being written.
102 if (bp->b_flags & B_BUSY)
106 * Make sure the buffer is dirty.
108 if ((bp->b_flags & B_DELWRI) == 0)
109 panic("vop_fsync: not dirty");
117 if (waitfor == MNT_WAIT) {
119 while (vp->v_numoutput) {
120 vp->v_flag |= VBWAIT;
121 tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "vopfsn");
125 if (vp->v_dirtyblkhd.lh_first) {
126 vprint("vop_fsync: dirty", vp);
133 * Write out the on-disc version of the vnode.
136 return VOP_UPDATE(vp, &tv, &tv, waitfor == MNT_WAIT);
142 The file system is full.
149 This man page was written by