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Date:	Thu, 19 Apr 2012 09:45:05 -0500
From:	Eric Sandeen <>
To:	Jouko Orava <>
CC:	Jouko Orava <>,,
	Zheng Liu <>
Subject: Re: Bug: Large writes can fail on ext4 if the write buffer is not

On 4/19/12 9:38 AM, Jouko Orava wrote:
>> FWIW, we tried fairly hard to get the limit lifted in the vfs, to no avail.
> I understand. The downsides from the limit are very small, after all.
> Has anyone tested the older stable kernel releases?
> When was the VFS limit added, or is it something RHEL kernels patch out?

No, RHEL kernels have the same limits.

>> Agreed, I think Dave was a little to quick on the draw on his reply.
> It is easy to miss, the EFAULT on the syscall that follows is so obvious.
> I've filed a terse report to the Red Hat Bugzilla:

Whoops, I just filed one as well.  I'll dup yours to mine since I've already
started the process there.


> Let me know if you wish me to expand on that report.
> Best regards,
>     Jouko Orava

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