freebsd man page for vfs_sync

VFS_SYNC(9)						   BSD Kernel Developer's Manual					       VFS_SYNC(9)

NAME
     VFS_SYNC -- flush unwritten data

SYNOPSIS
     #include <sys/param.h>
     #include <sys/mount.h>
     #include <sys/vnode.h>

     int
     VFS_SYNC(struct mount *mp, int waitfor);

DESCRIPTION
     The VFS_SYNC() macro writes out all unwritten data in the file system mounted as mp.

     The arguments it expects are:

     mp       The file system.

     waitfor  Whether the function should wait for I/O to complete.  Possible values are:

	      MNT_WAIT	  synchronously wait for I/O to complete

	      MNT_NOWAIT  start all I/O, but do not wait for it

	      MNT_LAZY	  push data not written by file system syncer

     The VFS_SYNC() macro calls the vfs_sync method of the file system, which normally calls VOP_FSYNC(9) for all the vnodes in the file system.

SEE ALSO
     fsync(2), sync(2), VFS(9), vnode(9), VOP_FSYNC(9)

AUTHORS
     This manual page was written by Doug Rabson.

BSD
								   May 23, 2009 							       BSD