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VFS_BUSY (9) | Kernel routines | Unix Manual Pages | :man▋

NAME

vfs_busy - "marks a mount point as busy"

CONTENTS

Synopsis
Description
Locks
Return Values
Errors
Authors

SYNOPSIS


.In sys/param.h
.In sys/mount.h int vfs_busy "struct mount *mp" "int flags" "struct mtx *interlkp" "struct thread *td"

DESCRIPTION

The 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 mp if the MNTK_UNMOUNT flag is set in mp->mnt_kern_flag and the LK_NOWAIT flag is not set.

Its arguments are:

mp The mount point to busy.
flags Flags controlling how vfs_busy should act.
LK_NOWAIT do not sleep if MNTK_UNMOUNT is set.
interlkp The interlock mutex for mp->mount_lock. If there is any chance the mount point is being unmounted and LK_NOWAIT is not set then interlock must be valid locked mutex.
td The thread responsible for this call.

LOCKS

If interlkp is a valid pointer it must be locked on entry, and it will not be unlocked even in the case of an error.

RETURN VALUES

A 0 value is returned on success. If the mount point is being unmounted ENOENT will always be returned.

ERRORS

[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 .

July 8, 2001 VFS_BUSY (9)
shtml">manServer 1.07 from vfs_busy.9 using doc macros.

 
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