linux-kernel - Re: PS3 Storage Driver O

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Date:	Wed, 18 Jul 2007 18:12:34 +0200 (CEST)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	Olaf Hering <olaf@...fle.de>
cc:	Paul Mackerras <paulus@...ba.org>, Jens Axboe <axboe@...nel.dk>,
	"James E.J. Bottomley" <James.Bottomley@...elEye.com>,
	Alessandro Rubini <rubini@...vis.unipv.it>,
	Geoff Levand <geoffrey.levand@...sony.com>,
	Linux/PPC Development <linuxppc-dev@...abs.org>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	linux-scsi@...r.kernel.org
Subject: Re: PS3 Storage Driver O_DIRECT issue

On Fri, 13 Jul 2007, Olaf Hering wrote:
> This driver (or the generic PS3 code) has appearently problems with
> O_DIRECT. 
> glibc aborts parted because the malloc metadata get corrupted. While it
> is reproducible, the place where it crashes changes with every version
> of the debug attempt.
> I dont have a handle right now, all I know is that the metadata after a
> malloc area get overwritten with zeros.
> 
> 
> Can you have a look at this? 
> parted /dev/ps3da
> print (a few times)

I could reproduce it with parted 1.8.0 and later.

The patch below fixes it (tested with 1.8.0, 1.8.2 (FC6), 1.9.0 (git)).

Apparently sometimes bio_cur_sectors(bio)*KERNEL_SECTOR_SIZE != bvec->bv_len
when using O_DIRECT. Is that true (or a bug?)?

If it's OK, I'll fold this patch into the main ps3disk patch.
---
 drivers/block/ps3disk.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/block/ps3disk.c
+++ b/drivers/block/ps3disk.c
@@ -108,7 +108,7 @@ static void ps3disk_scatter_gather(struc
 			__func__, __LINE__, i, bio_segments(bio),
 			bio_sectors(bio), sector);
 		bio_for_each_segment(bvec, bio, j) {
-			size = bio_cur_sectors(bio)*KERNEL_SECTOR_SIZE;
+			size = bvec->bv_len;
 			buf = __bio_kmap_atomic(bio, j, KM_IRQ0);
 			if (gather)
 				memcpy(dev->bounce_buf+offset, buf, size);

With kind regards,
 
Geert Uytterhoeven
Software Architect

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