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vfs_mountedon (9)

>> vfs_mountedon (9) ( FreeBSD man: Ядро )

BSD mandoc

NAME



vfs_mountedon

 - check if the vnode belongs to a mounted file system

SYNOPSIS

#include <sys/param.h>
#include <sys/mount.h>
int vfs_mountedon (struct vnode *vp);

DESCRIPTION

vfs_mountedon ();
inspects the Vt mount structure in Fa vp to determine if it points to a valid mount point. If the mount is valid, the vnode is considered to be busy.

A common use of vfs_mountedon ();
is to call it on device vnodes to determine if they are already associated with a file system. This is done to prevent multiple mounts on the same device.

RETURN VALUES

Er EBUSY is returned if the vnode has a valid mount point; otherwise, 0 is returned.

PSEUDOCODE

int
ffs_mountfs(devvp, mp, td, malloctype)
        register struct vnode *devvp;
        struct mount *mp;
        struct thread *td;
        struct malloc_type *malloctype;
{
        ...

        error = vfs_mountedon(devvp);
        if (error)
                return (error);

        ...
}

AUTHORS

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

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