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>.