vfs_busy.9freebsd

Langue: en

Autres versions - même langue

Version: 309318 (debian - 07/07/09)

Section: 9 (Appels noyau Linux)


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 struct mtx *interlkp struct thread *td

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.
LK_NOWAIT
do not sleep if MNTK_UNMOUNT is set.
Fa interlkp
The interlock mutex for Fa 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.
Fa td
The thread responsible for this call.

LOCKS

If Fa 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 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 .