On Thu, 13 Oct 2011 16:46:51 +0400 Pavel Shilovsky <piastryyy@xxxxxxxxx> wrote: > 2011/10/13 Jeff Layton <jlayton@xxxxxxxxxx>: > > On Thu, 13 Oct 2011 11:28:29 +0400 > > Pavel Shilovsky <piastryyy@xxxxxxxxx> wrote: > > > >> I tested your current cifs-3.2 branch and faced with strange results > >> (assuming Windows 7 share is mounted to /mnt/share): > >> > > > > I've not seen this, but I'll try to reproduce it in a little while. > > > >> piastry@adventure:~$ dd if=test1.iso of=/mnt/share/test.iso bs=100000 > >> > > > > Ok, so test1.iso is in your home directory and you're dd'ing it > > to /mnt/share/test.iso (which is a cifs mount) > > > >> piastry@adventure:~$ dd of=test.iso if=/mnt/share/test.iso bs=100000 > >> > > > > Then you copy test.iso back from the share to your homedir > > > >> piastry@adventure:~$ md5sum test.iso > >> 5eee1675f46ac594dd7800c37e3ba944 test.iso > >> > > > > Checksum of test.iso in your homedir and end up with the above... > > > >> piastry@adventure:~$ md5sum /mnt/share/test.iso > >> 5eee1675f46ac594dd7800c37e3ba944 /mnt/HOME-share/test.iso > >> > > > > The checksum matches the (apparent) one on the share > > > >> piastry@adventure:~$ md5sum test1.iso > >> 10d672583cab035e2b55048fbfbbf7ca test1.iso > >> > > > > But does not match the original. > > > >> Then, I umounted and mounted it again with 3.1-rc9 cifs module - > >> everything was fine. Then, I load previous "buggy" one and everything > >> was fine too. > >> > >> So, md5sums are not equal. Any ideas? > >> > > > > Not something I've seen in my testing. Some questions: > > > > 1) where is your home directory? is it on a local disk? > > It's on ext3 local hard drive. > > > > > 2) when you say "everything was fine" what checksum did you get? > > all checksums matched the original. > > > > > 3) if this test is repeatable, is there any discrepancy in the size of > > the file? IOW, when you do the md5sum, it would be good to also do a > > "stat" against the file the i_size is coming up correctly after each > > step. > > The size was the same - 415 MB. One time it happened I calculated the > number of different characters in these files - it was 127 (I don't > know how it can help, but anyway). > I tried this too, but haven't been able to reproduce it. Grabbed a random .iso file which is a bit bigger than yours -- 615M, and tried several of these tests and the checksum always came out the same... Do any of the dd commands return an error? -- Jeff Layton <jlayton@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
