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Hi Alan, Do you use the same command with me? The parameter "seek" of "dd if=/dev/zero of=aaa bs=1024k count=2 seek=3000" will inform "dd" to use truncate system call to expand file in no time. In normal situations, the file will grow up to 3G in about 2 seconds. This dd command on ext3 partition can run very well on my platform, but it will fail on UDF partition. Regards, Colin ----- Original Message ----- From: "Alan Cox" <alan@lxorguk.ukuu.org.uk> To: "colin" <colin@realtek.com.tw> Cc: <linux-kernel@vger.kernel.org> Sent: Monday, June 19, 2006 5:32 PM Subject: Re: UDF filesystem has some bugs on truncating > Ar Gwe, 2006-06-16 am 13:47 +0800, ysgrifennodd colin: > > Hi all, > > I found that UDF has bugs on truncating. > > When you do this: > > dd if=/dev/zero of=aaa bs=1024k count=2 seek=3000 > > , Linux will hang and die. > > The platform is Linux 2.6.16 on MIPS malta board. > > Ok I eventually sort of reproduced this on x86-64. It took a while > because in my environment I see a crash 2 or 3 hours after the test is > run, and that crash is on hardware that doesn't otherwise crash and > seems to be repeatable. > > Alan > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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