-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Tom Mortensen wrote: > I'm wondering if any resolution to this particular bug? I see this > exact kernel bug in copying large data sets (40GB+), and can reproduce > fairly well. Running reiserfsck produces this message: > > "Zero bit found in on-disk bitmap after the last valid bit." BTW, this error describes the following condition: With a 4KiB blocksize (assumed), each bitmap describes 128MiB chunks. If your file system is of such a size that it's not an even multiple of 128MiB, the final bitmap will describe blocks that aren't part of the file system. The easiest way to represent them is to mark them used so that they won't end up getting allocated, ever. The message quoted above means that some of the bits that describe the blocks beyond the end of the file system have been zeroed, indicating that the space is available. If you were actually hit by this condition at runtime, you'd get "attempt to access beyond end of device" or something like that in your log. In any event, something is corrupting your bitmaps and that needs to get tracked down. The size of the file system is important. I've been seeing reports of users hitting similar problems with file systems larger than 8 TiB. The cause is that the s_bmap_nr field in the superblock is 16 bit, and the file system assumes it's correct. mkreiserfs < 3.6.20 will happily create those file systems with a value that has wrapped, while mkreiserfs >= 3.6.20 will zero the value out, causing a mount failure unless the kernel has been patched to support the full size and to interpret s_bmap_nr == 0 as "value has overflowed." I've posted some lightly tested versions of patches to handle > 8TiB file systems on the reiserfs-devel mailing list and hope to finalize them this week. If your file system isn't larger than 8 TiB, then we'll have to do a bit more hunting. - -Jeff - -- Jeff Mahoney SUSE Labs -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4-svn0 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org iD8DBQFGulesLPWxlyuTD7IRAsK2AJ9hHXP/u/U39ilYbJzuJZH1Ak7n3ACfb/Oo 2GIGKznayXqevH6lVGh8vew= =q4Ca -----END PGP SIGNATURE----- - To unsubscribe from this list: send the line "unsubscribe reiserfs-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
