Date: Sat, 23 Jan 1999 19:40:39 -0800 From: David Greenman <dg@root.com> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: Re: cvs commit: src/sys/kern uipc_syscalls.c Message-ID: <199901240340.TAA13841@implode.root.com> In-Reply-To: Your message of "Sat, 23 Jan 1999 19:42:38 PST." <199901240342.TAA57652@apollo.backplane.com>
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>:
>:>dillon 1999/01/23 17:15:58 PST
>:>
>:> Modified files:
>:> sys/kern uipc_syscalls.c
>:> Log:
>:> There was a situation where sendfile() might attempt to initiate I/O
>:> on a PG_BUSY page, due to a bug in its sequencing of a conditional.
>:
>: Huh? Would you please explain this further?
>
> The original conditional was:
>
> if (pg == NULL || (!(pg->flags & PG_BUSY) && !pg->busy &&
> !vm_page_is_valid(pg, pgoff, xfsize))) {
>
> ...
> ... wire page and start I/O ...
> } else {
> ... wait for page ...
> }
>
> Hmmm. lemme read this again. Oops, I think you are
> right, that wasn't a bug. Well, consider keeping the new
> code anyway, it's more readable then the old code.
Agreed.
-DG
David Greenman
Co-founder/Principal Architect, The FreeBSD Project
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