* Change device block count from userspace?
@ 2018-04-16 10:24 Manuel Lauss
2018-04-17 22:43 ` Martin K. Petersen
0 siblings, 1 reply; 4+ messages in thread
From: Manuel Lauss @ 2018-04-16 10:24 UTC (permalink / raw)
To: linux-block
Hello,
I have a SATA SSD which suddenly reports its size as 2.2TB, 0xFFFFFFFF
block count:
[ 30.620086] sd 10:0:0:0: [sdc] 4294967295 512-byte logical blocks:
(2.20 TB/2.00 TiB)
[ 30.620327] sd 10:0:0:0: [sdc] Write Protect is off
[ 30.620329] sd 10:0:0:0: [sdc] Mode Sense: 43 00 00 00
[ 30.620771] sd 10:0:0:0: [sdc] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 34.170412] GPT:Primary header thinks Alt. header is not at the end
of the disk.
[ 34.170413] GPT:4004704367 != 4294967294
[ 34.170414] GPT:Alternate GPT header not at the end of the disk.
[ 34.170414] GPT:4004704367 != 4294967294
[ 34.170414] GPT: Use GNU Parted to correct GPT errors.
[ 34.170419] sdc: sdc1
[ 34.172408] sd 10:0:0:0: [sdc] Attached SCSI disk
[ 64.293698] sd 10:0:0:0: [sdc] tag#15 uas_eh_abort_handler 0
uas-tag 1 inflight: CMD IN
[ 64.293702] sd 10:0:0:0: [sdc] tag#15 CDB: Read(10) 28 00 ff ff ff
00 00 00 08 00
It's impossible to access this device with either dd or any other
tools because apparently
the kernel tries to access higher blocks which, one after the other,
time out after around 5 minutes. It's possible to access the disk on
Windows with an Ext4 driver, data seems fine but retrieval is very
slow.
Is there a way from userspace to tell the block layer that this device
has only 4004704368 blocks, and that it should not touch the higher
ones?
Thanks!
Manuel
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Change device block count from userspace?
2018-04-16 10:24 Change device block count from userspace? Manuel Lauss
@ 2018-04-17 22:43 ` Martin K. Petersen
2018-04-18 5:17 ` Manuel Lauss
0 siblings, 1 reply; 4+ messages in thread
From: Martin K. Petersen @ 2018-04-17 22:43 UTC (permalink / raw)
To: Manuel Lauss; +Cc: linux-block
Manuel,
> I have a SATA SSD which suddenly reports its size as 2.2TB, 0xFFFFFFFF
> block count:
"Suddenly" as in out of the blue? Or after a drive firmware update? Or a
kernel ditto?
--
Martin K. Petersen Oracle Linux Engineering
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Change device block count from userspace?
2018-04-17 22:43 ` Martin K. Petersen
@ 2018-04-18 5:17 ` Manuel Lauss
2018-04-20 1:37 ` Martin K. Petersen
0 siblings, 1 reply; 4+ messages in thread
From: Manuel Lauss @ 2018-04-18 5:17 UTC (permalink / raw)
To: Martin K. Petersen; +Cc: linux-block
On Wed, Apr 18, 2018 at 12:43 AM, Martin K. Petersen
<martin.petersen@oracle.com> wrote:
>
> Manuel,
>
>> I have a SATA SSD which suddenly reports its size as 2.2TB, 0xFFFFFFFF
>> block count:
>
> "Suddenly" as in out of the blue? Or after a drive firmware update? Or a
> kernel ditto?
Out of the blue, yes. I think it's actually userspace (udev/udisks?)
which tries
to read a few block from the very end of the device, which confuses
the drive firmware.
Sometimes it recovers and then it can be mounted read-only without issues.
It's not a kernel fault, the drive is broken.
Still, is there a userspace option (sysfs attribute perhaps) to limit
disk capacity to
a certain block count?
Thank you!
Manuel
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Change device block count from userspace?
2018-04-18 5:17 ` Manuel Lauss
@ 2018-04-20 1:37 ` Martin K. Petersen
0 siblings, 0 replies; 4+ messages in thread
From: Martin K. Petersen @ 2018-04-20 1:37 UTC (permalink / raw)
To: Manuel Lauss; +Cc: Martin K. Petersen, linux-block
Manuel,
> It's not a kernel fault, the drive is broken.
Interesting, OK. Just wanted to make sure we didn't have a regression. I
tweaked the capacity reading code recently.
> Still, is there a userspace option (sysfs attribute perhaps) to limit
> disk capacity to a certain block count?
I'm afraid not.
--
Martin K. Petersen Oracle Linux Engineering
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2018-04-20 1:37 UTC | newest]
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2018-04-16 10:24 Change device block count from userspace? Manuel Lauss
2018-04-17 22:43 ` Martin K. Petersen
2018-04-18 5:17 ` Manuel Lauss
2018-04-20 1:37 ` Martin K. Petersen
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