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 13.1-RELEASE-p6        February 11, 2013       FreeBSD 13.1-RELEASE-p6