linux-kernel - Re: 2.6.20 kernel hang with USB drive and vfat doing ftruncate

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Message-id: <45D639F3.8030609@shaw.ca>
Date:	Fri, 16 Feb 2007 17:10:43 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Kumar Gala <galak@...nel.crashing.org>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.20 kernel hang with USB drive and vfat doing ftruncate

Kumar Gala wrote:
> I'm seeing an issue with a stock 2.6.20 kernel running on an embedded 
> PPC.  I've got a usb flash drive plugged in and the filesystem on the 
> drive is vfat.  Running with 64M and no swap.
> 
> If I execute a series of large (100M+) ftruncate() on the disk the 
> kernel will hang and never return.  It seems to be stuck in the idle 
> loop().

On FAT filesystems this forces the entire file contents of that size to 
be written out with zeros. Are you sure the kernel just isn't busy 
writing out all that data to the disk?

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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