linux-kernel - Re: "netfs: Can't donate prior to front"

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Message-ID: <CAKPOu+_Cbkq7ROF=azCnWNcgDS4V=SyKC-_ixVo9siyE_SOeow@mail.gmail.com>
Date: Mon, 10 Feb 2025 18:45:04 +0100
From: Max Kellermann <max.kellermann@...os.com>
To: David Howells <dhowells@...hat.com>
Cc: netfs@...ts.linux.dev, LKML <linux-kernel@...r.kernel.org>, 
	linux-nfs@...r.kernel.org
Subject: Re: "netfs: Can't donate prior to front"

On Mon, Feb 10, 2025 at 6:41 PM Max Kellermann <max.kellermann@...os.com> wrote:
> Additionally, here you have a file with a dump of *subreq and *req (of
> R=8). I have added additional fields "start0" and "len0" which contain
> the values initially set on these.

btw. this happens because there is only one subrequest (R=8[7]), but
the start offset is being rounded down (folio_order=2), thus
"fpos<start":

 (gdb) p/x fpos
 $5 = 0x1c0000
 (gdb) p/x fend
 $6 = 0x200000
 (gdb) p/x start
 $7 = 0x1c6000