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Re: [PATCH 4/5] Fix loop test
From: |
Phillip Susi |
Subject: |
Re: [PATCH 4/5] Fix loop test |
Date: |
Thu, 22 Dec 2011 20:07:06 -0500 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:8.0) Gecko/20111124 Thunderbird/8.0 |
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On 12/22/2011 04:54 PM, Jim Meyering wrote:
> I'd really like to have a way to run two or more scsi_debug-using
> tests in parallel but that is not possible: the kernel allows only one.
>
> Note that for many of our scsi-debug-using tests, you cannot duplicate
> the functionality using a loop device. Besides, even where you can,
I thought the only reason you needed scsi_debug was because loop devices
couldn't be partitioned. What other reason is there?
> because we don't use e.g., special alignment or block size, you risk
> being unable to create a loop device due to inherent limitations, or,
> if you create a few because their tests are running in parallel, you
> risk perturbing regular processes that (albeit rarely) need to create a
> loop device. That is part of the reason for my using a private-homed
> device tree: there I know I'm starting from a clean slate: i.e., far
> less risk of interfering with some other loop-creating process.
I don't follow. How does using loop devices interfere with other processes
doing the same? And how does using your own /dev directory help at all? Just
because you have your own /dev directory doesn't mean you have your own set of
devices; any devices that actually exist when you start still exist ( and are
in use ) so you can't re-create a private copy, and any devices you create
still show up in the real /dev.
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- Re: [PATCH 3/5] Avoid the HDIO_GETGEO when possible, (continued)
- [PATCH 5/5] Try harder to clean up scsi_debug, Phillip Susi, 2011/12/16
- [PATCH 4/5] Fix loop test, Phillip Susi, 2011/12/16
- Re: [PATCH 4/5] Fix loop test, Jim Meyering, 2011/12/21
- Re: [PATCH 4/5] Fix loop test, Phillip Susi, 2011/12/21
- Re: [PATCH 4/5] Fix loop test, Jim Meyering, 2011/12/21
- Re: [PATCH 4/5] Fix loop test, Phillip Susi, 2011/12/21
- Re: [PATCH 4/5] Fix loop test, Keshav P R, 2011/12/21
- Re: [PATCH 4/5] Fix loop test, Jim Meyering, 2011/12/22
- Re: [PATCH 4/5] Fix loop test,
Phillip Susi <=
- Re: [PATCH 4/5] Fix loop test, Jim Meyering, 2011/12/23
[PATCH 2/5] Remove has_partitions check to allow loopback partitions, Phillip Susi, 2011/12/16
Re: [PATCH 1/5] Remove loop_get_partition_range, Jim Meyering, 2011/12/21