vfs_sync(9) [freebsd man page]

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

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

NAME

     VOP_FSYNC -- flush file system buffers for a file

SYNOPSIS

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

     int
     VOP_FSYNC(struct vnode *vp, int waitfor, struct thread *td);

DESCRIPTION

     This call flushes any dirty file system buffers for the file.  It is used to implement the sync(2) and fsync(2) system calls.

     Its arguments are:

     vp       The vnode of the file.

     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.

     td       The calling thread.

     The argument waitfor is either MNT_WAIT or MNT_NOWAIT and specifies whether or not the function should wait for the writes to finish before
     returning.

LOCKS

     The file should be locked on entry.

RETURN VALUES

     Zero is returned if the call is successful, otherwise an appropriate error code is returned.

ERRORS

     [ENOSPC]		The file system is full.

     [EDQUOT]		Quota exceeded.

SEE ALSO

     vnode(9)

AUTHORS

     This manual page was written by Doug Rabson.

BSD
								   July 24, 1996							       BSD