linux-ext4 - Re: ext4 goes into read only mode on using discard with htree_dirblock_to

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Date:	Sat, 04 Jan 2014 15:35:31 +0100
From:	Bernd Schubert <bernd.schubert@...tmail.fm>
To:	Ritesh Khadgaray <khadgaray@...il.com>
CC:	Theodore Ts'o <tytso@....edu>, linux-ext4@...r.kernel.org,
	Andreas Dilger <adilger.kernel@...ger.ca>
Subject: Re: ext4 goes into read only mode on using discard with htree_dirblock_to_tree
 ... bad entry in directory



On 01/02/2014 07:55 PM, Theodore Ts'o wrote:
> On Thu, Jan 02, 2014 at 10:49:56AM +0530, Ritesh Khadgaray wrote:

> 
> However, in your case, if discard commands are causing on-disk
> corruption, I'm not sure I can even in good conscience recommend using
> fstrim.
> 
>> Device Model: Crucial_CT960M500SSD1
>> Serial Number: 1335094BE7CA
>> LU WWN Device Id: 5 00a075 1094be7ca
>> Firmware Version: MU03
> 

If this is not a production system you can try to switch to another 
provisioning mode. I.e. Intel510 drives cause data corruption with 
write-same-10, but unmap works fine.

cat /sys/class/scsi_disk/H\:C\:I\:L/provisioning_mode 

and

echo -n {writesame_16,unmap} > /sys/class/scsi_disk/H\:C\:I\:L/provisioning_mode


(lsscsi can provide the H:C:I:L tuplet)



Cheers,
Bernd
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