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VFS_BUSY(9)		 BSD 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).

AUTHORS
     This manual page was written by Chad David ⟨davidc@acns.ab.ca⟩.

BSD				 June 14, 2010				   BSD

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