Hello,
On Wed, Dec 22, 2010 at 11:27:03AM -0600, James Bottomley wrote:
> Trying to test out the SCSI post merge tree, I've found it won't boot on
> my SCSI test system. The reason is a failure to read the partition
> table of the root disc. It just gives
>
> sda: unable to read partition table
>
> The other four discs in the system seem to read their partition tables
> OK.
That's really weird.
> The obvious candidate is the partition code rework in block/for-next.
> Simply reverting
>
> commit d2bf1b6723ed0eab378363649d15b7893bf14e91
> Author: Tejun Heo <tj@xxxxxxxxxx>
> Date: Wed Dec 8 20:57:36 2010 +0100
>
> block: move register_disk() and del_gendisk() to block/genhd.c
>
> Doesn't fix the boot failure, so it's obviously something deeper.
Can you please apply the following patch and see what the kernel says?
Thanks.
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index bdf8d3c..dd0b0f3 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -186,6 +186,8 @@ check_partition(struct gendisk *hd, struct block_device *bdev)
/* We have hit an I/O error which we don't report now.
* But record it, and let the others do their job.
*/
+ printk(KERN_WARNING "XXX %s: check_part %pf failed with %d\n",
+ state->name, check_part[i-1], res);
err = res;
res = 0;
}
@@ -197,8 +199,11 @@ check_partition(struct gendisk *hd, struct block_device *bdev)
free_page((unsigned long)state->pp_buf);
return state;
}
- if (state->access_beyond_eod)
+ if (state->access_beyond_eod) {
+ printk(KERN_WARNING "XXX %s: access_beyond_eod, err=-ENOSPC\n",
+ state->name);
err = -ENOSPC;
+ }
if (err)
/* The partition is unrecognized. So report I/O errors if there were any */
res = err;
diff --git a/fs/partitions/check.h b/fs/partitions/check.h
index d68bf4d..f836fb2 100644
--- a/fs/partitions/check.h
+++ b/fs/partitions/check.h
@@ -26,6 +26,8 @@ static inline void *read_part_sector(struct parsed_partitions *state,
sector_t n, Sector *p)
{
if (n >= get_capacity(state->bdev->bd_disk)) {
+ printk(KERN_WARNING "XXX %s: setting access_beyond_eod for sector %llu\n",
+ state->name, (unsigned long long)n);
state->access_beyond_eod = true;
return NULL;
}
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