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vfs_busy.9freebsd

BSD mandoc

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. The purpose of this function is to synchronize access to 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 LK_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 Er ENOENT will always be returned.

ERRORS

Bq Er ENOENT

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

AUTHORS

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