Date: Tue, 16 Feb 1999 16:44:28 -0500 (EST) From: Luoqi Chen <luoqi@watermarkgroup.com> To: amarks@sarnoff.com, freebsd-hackers@FreeBSD.ORG Subject: Re: Memory-Based VFS Question Message-ID: <199902162144.QAA23030@lor.watermarkgroup.com>
next in thread | raw e-mail | index | archive | help
> I'm implementing a memory-based VFS on 3.0-19981123. I have almost all
> of the VOP_* functions implemented but I ran into a slight problem with
> file copies. If I copy a file from and to a dir mounted on my fs, the
> kernel calls mmap to map the data in (I guess it would call vop_read if
> the data was too large). My problem is that the kernel never calls my
> vop_mmap (not even sure if it's supposed to) so I never get the
> opportunity to copy the data from my fs to kernel space so the data in
> the io vector pased to me at vop_write is invalid. Any ideas?
>
> Thanks,
> -A.
>
> --
> Aaron J. Marks Communications and Computing Systems Lab
> Assoc. Member Tech Staff Advanced Networks and Computation Group
> amarks@sarnoff.com Sarnoff Corporation
>
I don't think VOP_MMAP is used any where, you need to implement
VOP_GETPAGES and VOP_PUTPAGES instead. The simplest way is to make them
wrapper functions calling vnode_pager_generic_{get,put}pages, take a look
at vm/vnode_pager.c
-lq
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199902162144.QAA23030>