On Monday, 07 February, 2005 10:38 AM Vitaly Fertman wrote: > On Saturday 05 February 2005 19:31, Michael Styer wrote: >> OK. So I killed everything that was keeping /usr busy and unmounted it. >> I ran debugfs.reiser4 on /dev/hdb1 unmounted. Then I mounted the >> partition ( 'mount -t reiser 4 -o ro,noatime /dev/hdb1 /usr' ). Now >> debugfs.reiser4 dies with this output: >> >> Fatal: Can't read master super block. Error: Can't open reiser4 >> on /usr >> >> and fsck.reiser4 says this: >> >> Fatal: Can't read master superblock. Fatal: Failed to open the >> reiser4 backup. Fatal: Cannot open the FileSysten on (/usr). >> >> 1 fatal corruptions were detected in SuperBlock. Run with --build-sb >> option to fix them. > > what version of reiser4progs have you created this fs with? > it looks like the version 1.0.3 cannot open the fs due to some > changes in the format.
I'm not entirely sure when I built this filesystem, but my guess is it was version 1.0.2. >> Regarding the output of fsck.reiser4, it suggests to run fsck.reiser4 >> --build-sb. What's that going to do to my filesystem? Am I likely to >> lose the contents (i.e. is it like reformatting) or will it fix the >> structure without causing data loss? At the minute it seems I still have >> access to the filesystem, so I could tar everything up now before >> rebuilding the superblock if doing so would mean losing that data. > > backups are never useless. Yes, a good point. >> Do you have any suggestions or advice as to what I should do from here? > > it depends on the reiser4progs version you created the fs with. > if it was 1.0.2, you can just run 'fsck.reiser4 --build-sb <device>', > of the 1.0.3 version, it will add reiser4 backup info properly. Do you mean, if I did create the fs with reiser4progs 1.0.2 I can now run version 1.0.3 of fsck.reiser4 with the --build-sb option and it will do the right thing? > if nothing has been changed on the fs since mas.devhdb1_unmounted.bz2 > was created, you will get 2 fs corruptions that can be fixed with > 'fsck.reiser4 --build-fs <device>' only. about 90 leaves will be cut off > the tree and will be inserted leaf-by-leaf and after that not inserted > item-by-item. > > btw, it is possible to run > fsck.reiser4 --build-sb --build-fs <device> > to fix it all together. Just to confirm, I can do this using my current version 1.0.3 of reiser4progs even if I created the fs with version 1.0.2? And I'm assuming I have to have the fs mounted ro to do this, correct? Or should I unmount the fs completely before doing this? Thanks again. Michael
