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Re: [PATCH] xfstests: add disk failure simulation test

To: Dmitry Monakhov <dmonakhov@xxxxxxxxxx>
Subject: Re: [PATCH] xfstests: add disk failure simulation test
From: Eric Sandeen <sandeen@xxxxxxxxxx>
Date: Thu, 14 Feb 2013 09:15:46 -0600
Cc: xfs@xxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, dchinner@xxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <87621vngtw.fsf@xxxxxxxxxx>
References: <1360770097-6351-1-git-send-email-dmonakhov@xxxxxxxxxx> <511BBF33.20908@xxxxxxxxxx> <87621vngtw.fsf@xxxxxxxxxx>
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On 2/14/13 7:52 AM, Dmitry Monakhov wrote:
> On Wed, 13 Feb 2013 10:28:35 -0600, Eric Sandeen <sandeen@xxxxxxxxxx> wrote:
>> On 2/13/13 9:41 AM, Dmitry Monakhov wrote:

<snip>

>>> +# get standard environment, filters and checks
>>> +. ./common.rc
>>> +. ./common.filter
>>> +
>>> +# TODO move it to common.blkdev if necessery
>>
>> maybe a comment as to why you do this?  (presumably to find the right thing 
>> in /sys)
>> I hope this always works with all udev schemes etc?
> I just ment to say that functions below are good candidates to became
> common wrappers.

Sure, but what is the reason for the wrapper?

On inspection I think its' because you need the right sysfs name; it'd
just be nice to say that it's the reason for the readlink/basename
frobbing of the existing $SCRATCH_DEV.  Not a huge deal.

>>> +SCRATCH_REAL_DEV=`readlink -f $SCRATCH_DEV`
>>> +SCRATCH_BDEV=`basename $SCRATCH_REAL_DEV`
>>> +

<snip>

>>> +_require_debugfs()
>>> +{
>>> +    #boot_params always present in debugfs
>>> +    [ -d "$DEBUGFS_MNT/boot_params" ] || _notrun "Debugfs not mounted"
>>> +}
>>
>> Would it make more sense to look for debugfs in /proc/filesystems
>> as a test for it being *available* (as opposed to mounted somewhere?)
>>
>> I wonder if a helper (maybe in _require_debugfs) should work out if
>> it's mounted, if not, try to mount it, and in the end, export DEBUGFS_MNT
>> for any test that wants to use it.
>>
>> Otherwise if it happens to be mounted elsewhere, this'll all fail.
>> Just a thought.  Maybe that's unusual enough that there's no point.
>> But getting it mounted if it's not would be helpful I think.

Any thoughts on this?  As it stands it requires debugfs to be
at /sys/kernel/debug (by default) *and* mounted prior to the test run.
So it's another (maybe unexpected) piece of pre-test setup which might
result in this test not getting run.

-Eric

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