Re: [linux-usb-devel] 2.6.20 kernel hang with USB drive and vfatdoing ftruncate

From: Andrew Morton
Date: Wed Feb 21 2007 - 17:55:29 EST

On Wed, 21 Feb 2007 16:50:23 -0500 (EST)
Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:

> > + if ((gfp_mask & (__GFP_FS|__GFP_IO)) != (__GFP_FS|__GFP_IO)) {
> Is that really the correct test? I don't know enough about the memory
> management subsystem to say one way or the other. What's special about
> having both flags set?

yup. We're saying "if the caller is unable to take either IO locks or FS
locks, don't wait on FS or IO completion".

ie: don't wait on writeout progress unless we know that both the IO system
and the FS are able to make progress.
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