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Manual Pages  — VFS_BUSY

NAME

vfs_busy – marks a mount point as busy

CONTENTS

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 <Mt davidc@acns.ab.ca>.
VFS_BUSY (9) February 11, 2013
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