lkml.org 
[lkml]   [2006]   [Nov]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: possible bug in ide-disk.c (2.6.18.2 but also older)
> After reading it a second time, I'll see if I got it straight now:
>
> .) the kernel always loads even-aligned pairs of sectors.
> .) for an odd-sectored disk, this results in the GPT plus the
> following (non-existent) sector being accessed from disk.

Yes

> .) the old, unmaintained ide-driver generally does not handle
> the odd-size case right, as it misinterprets the harddisks
> error for the second sector (the one after the end) as a
> general error causing dma to be turned off, after some retries.
> It would also do that, if I later accessed the last sector
> (e.g. dd if=/dev/hda ..., or by accessing a file that happens
> to be stored there per filesystem, if at all possible),
> not just during the initial GPT-check.

Only ever seen during the partition check

> .) If I remove the "addr++;", then the harddisk is actually
> believed to be 1 sector smaller than it really is, which
> means that it looks like an even-sized disk. This could mean
> that an eventually existing GPT could be missed. What would
> be the "worst-case" consequences?
> .) if ((old ide-driver) && (odd # of sectors)) youre_doomed_anyway(); ?

Not in any normal situation it appears, just the partition code seems to
trip it up.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-11-21 13:05    [W:0.063 / U:0.788 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site