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VFS_BUSY(9)		    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 ports 15.quarterly	February 11, 2013		     VFS_BUSY(9)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=vfs_busy&sektion=9&manpath=FreeBSD+15.1-RELEASE+and+Ports.quarterly>

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