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

Sony Network and Software Technology Center Europe
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