vfs_busy (9)

Leading comments

Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.

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(The comments found at the beginning of the groff file "man9/vfs_busy.9freebsd".)

NAME

vfs_busy - marks a mount point as busy

SYNOPSIS

In sys/param.h In sys/mount.h Ft int Fn vfs_busy struct mount *mp int flags

DESCRIPTION

The Fn 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 Fa mp if the MNTK_UNMOUNT flag is set in Fa mp->mnt_kern_flag and the MBF_NOWAIT flag is not set.

Its arguments are:

Fa mp

The mount point to busy.

Fa flags

Flags controlling how Fn 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 Er ENOENT will be returned.

ERRORS

Bq Er ENOENT

The mount point is being unmounted ( MNTK_UNMOUNT is set).

SEE ALSO

vfs_unbusy9

AUTHORS

This manual page was written by An Chad David Aq davidc@acns.ab.ca .