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SubjectRe: Partition check considered as error is breaking mounting in 2.6.27
On Fri, 12 Sep 2008 13:56:49 -0300
Herton Ronaldo Krzesinski <herton@mandriva.com.br> wrote:

> Recently I found a problem with a buggy camera that doesn't mount anymore with
> 2.6.27 (its memory is available via usb-storage), since commit
> 04ebd4aee52b06a2c38127d9208546e5b96f3a19
>
> The camera is an Olympus X-840. The original issue comes from the camera
> itself: its format program creates a partition with an off by one error,
> while the device reports that its memory has 42079 sectors, the partition
> table reports also that the only partition on the disk has the size of 42079,
> but it fails to account for the first sector in the memory that contains the
> partition table, so in the end the partition exceeds the limit of the device
> size (42080, first sector plus 42079 from the first partition).
>
> In previous kernels (2.6.26 and before), I still could mount and access the
> device (/dev/sdb1), although with the following errors:

Yeah.

Can you test this please?

From: Andrew Morton <akpm@linux-foundation.org>

Herton Krzesinski reports that the error-checking changes in
04ebd4aee52b06a2c38127d9208546e5b96f3a19 ("block/ioctl.c and
fs/partition/check.c: check value returned by add_partition") cause his
buggy USB camera to no longer mount. "The camera is an Olympus X-840.
The original issue comes from the camera itself: its format program
creates a partition with an off by one error".

Buggy devices happen. It is better for the kernel to warn and to proceed
with the mount.

Reported-by: Herton Ronaldo Krzesinski <herton@mandriva.com.br>
Cc: Abdel Benamrouche <draconux@gmail.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

fs/partitions/check.c | 1 -
1 file changed, 1 deletion(-)

diff -puN fs/partitions/check.c~rescan_partitions-make-device-capacity-errors-non-fatal fs/partitions/check.c
--- a/fs/partitions/check.c~rescan_partitions-make-device-capacity-errors-non-fatal
+++ a/fs/partitions/check.c
@@ -540,7 +540,6 @@ int rescan_partitions(struct gendisk *di
if (from + size > get_capacity(disk)) {
printk(KERN_ERR " %s: p%d exceeds device capacity\n",
disk->disk_name, p);
- continue;
}
res = add_partition(disk, p, from, size, state->parts[p].flags);
if (res) {
_


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