Tao Ma wrote: > Hi Paul, > > On 06/16/2010 05:11 AM, Paul Eggert wrote: >> On 06/10/2010 05:35 PM, Tao Ma wrote: >> >>> there is a flag FIEMAP_EXTENT_DELALLOC in fiemap ... >>> with dd if=/dev/zero of=/mnt/ext4/a bs=1M count=1 seek=1 >>> the ext4 can't return a valid fiemap extent. >> >> Hmm, this sounds like a fairly serious bug, in that it would prevent this >> part of cp from working. What does the fiemap ioctl return in this >> buggy case? In this case, fiemap ioctl returns successfully, but 'fm_mapped_extents' will set to ZERO to indicate there is no extents allocated for the file. >> Is there some way that cp can detect the bug, and report it to the user, >> or work around it? work around is add FIEMAP_FLAG_SYNC to fiemap ioctl at the moment.
Thanks, -Jeff Or should we just assume that the bug will get fixed >> and that cp shouldn't worry about it? > I have prompted this to the linux ext4 > community(http://lkml.org/lkml/2010/6/10/412), they are working on it > now I guess. > > Regards, > Tao -- With Windows 7, Microsoft is asserting legal control over your computer and is using this power to abuse computer users.
