Re: [PATCH] Re: zero-filed page on VOP_PUTPAGES

[manu%netbsd.org@localhost (Emmanuel Dreyfus)]

YAMAMOTO Takashi <yamt%mwd.biglobe.ne.jp@localhost> wrote:

> alternatively, using puffs_msg_setcall, i think you can make GETATTR
> reliably know if there's a pending SETATTR or not.
> if there's a pending SETATTR, GETATTR can ignore a part of the reply
> from the file server and returns the kernel's idea of the file attributes
> instead.

That seems the best way, but you need to do it everywhere
uvm_vnp_setsize() is called, that is:
puffs_vnop_getattr
dosetattr
puffs_vnop_write

It seems useless in puffs_getvnode since no race can occur there,
though.

We would have a PNODE_IN_RESIZE flag for struct pnode's pn_stat, set and
cleared in dosetattr(), and use vp->v_size on uvm_vnp_setsize() calls
when set? Or just avoid uvm_vnp_setsize() calls?

-- 
Emmanuel Dreyfus
http://hcpnet.free.fr/pubz
manu%netbsd.org@localhost