Hi Ted, On Fri, Aug 17, 2012 at 09:15:58AM -0400, Theodore Ts'o wrote: > Thanks Fengguang: > > For the record, I was able to find my own easy repro, last night using > only a 220 meg partition: > > # mke2fs -t ext4 -b 1024 -J size=1 /dev/vdc > # mount -t ext2 /dev/vdc /vdc > # mkdir /vdc/a > # cd /vdc/a > # seq 1 210000 | xargs -n 1 fallocate -l 1m > # seq 1 2 210000 | xargs /bin/rm > # mkdir /vdc/b > # cd /vdc/b > # seq 1 103 | xargs -n 1 fallocate -l 1g > # cd / > # umount /vdc > # mount -t ext4 -o commit=10000 /dev/vdc /vdc > # rm -rf /vdc/b It makes a nice and simple test script, I'd very like to add it to my 0day test system :-) > For future reference, there are a couple of things that are of > interest to ext4 developers when trying to create repro's: > > 1) The use of mounting with ext2 to speed up the setup. > > 2) The first two "seq ... | xargs ..." commands to create a very > fragmented file system. > > 3) Using a 1k block size file system to stress the extent tree code > and htree directory (since its easier to make larger tree structure). > > 4) The use of the mount option commit=10000 to test what happens when > the journal is full (without using a nice, fast device such as RAID array > or without burning write cycles on an expensive flash device.) Thanks for the directions! I'll make that a big comment. Thanks, Fengguang -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
