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VFS_BUSY(9)	       FreeBSD Kernel Developer's Manual	   VFS_BUSY(9)

NAME
     vfs_busy -- marks a mount point as	busy

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

     int
     vfs_busy(struct mount *mp,	int flags);

DESCRIPTION
     The vfs_busy() function marks a mount point as busy by incrementing the
     reference count of	a mount	point.	It also	delays unmounting by sleeping
     on	mp if the MNTK_UNMOUNT flag is set in mp-_mnt_kern_flag	and the
     MBF_NOWAIT	flag is	not set.

     Its arguments are:

     mp	    The	mount point to busy.

     flags  Flags controlling how vfs_busy() should act.

	    MBF_NOWAIT	    do not sleep if MNTK_UNMOUNT is set.

	    MBF_MNTLSTLOCK  drop the mountlist_mtx in the critical path.

RETURN VALUES
     A 0 value is returned on success.	If the mount point is being unmounted
     and MBF_NOWAIT flag is specified ENOENT will be returned.

ERRORS
     [ENOENT]		The mount point	is being unmounted (MNTK_UNMOUNT is
			set).

SEE ALSO
     vfs_unbusy(9)

AUTHORS
     This manual page was written by Chad David	<davidc@acns.ab.ca>.

FreeBSD	10.1		       February	11, 2013		  FreeBSD 10.1

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | AUTHORS

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<http://www.freebsd.org/cgi/man.cgi?query=vfs_busy&sektion=9&manpath=FreeBSD+9.2-RELEASE>

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