Manual Pages  — VFS_BUSY

vfs_busy – marks a mount point as busy

SYNOPSIS DESCRIPTION RETURN VALUES ERRORS SEE ALSO AUTHORS

#include <sys/param.h>

#include <sys/mount.h>

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

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.

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

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

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