ext3 journaling

I've been working on versioning extension to ext3, which requires
modifying some of the data structures, the way ext3 does writes,
truncations, etc.  But I've got a journal bug and I don't know what the
error message means, and I'm looking for some help.

Here's the output from the kernel log:

Oct 13 08:40:14 hssl1 kernel: journal_bmap: journal block not found at
offset 7948 on sd(8,1)
Oct 13 08:40:14 hssl1 kernel: Aborting journal on device sd(8,1).
Oct 13 08:40:14 hssl1 kernel: ext3_abort called.
Oct 13 08:40:14 hssl1 kernel: EXT3-fs abort (device sd(8,1)):
ext3cow_journal_start: Detected aborted journal
Oct 13 08:40:14 hssl1 kernel: Remounting filesystem read-only

Sometimes I'll get a function backtrace from the abort:

Sep 30 12:07:23 hssl1 kernel: journal_bmap: journal block not found at
offset 7948 on sd(8,1)
Sep 30 12:07:23 hssl1 kernel: Aborting journal on device sd(8,1).
Sep 30 12:07:24 hssl1 kernel: ext3_reserve_inode_write: aborting
transaction:
 Journal has aborted in __ext3_journal_get_write_access<2>EXT3COW-fs
error (device sd(8,1)) in ext3_reserve_inode_write: Journal has aborted
Sep 30 12:07:24 hssl1 kernel: EXT3-fs error (device sd(8,1)) in
ext3_new_inode: Journal has aborted
Sep 30 12:07:24 hssl1 kernel: EXT3-fs error (device sd(8,1)) in
ext3_create: Journal has aborted
Sep 30 12:07:24 hssl1 kernel: ext3_abort called.
Sep 30 12:07:24 hssl1 kernel: EXT3-fs abort (device sd(8,1)):
ext3_journal_start: Detected aborted journal
Sep 30 12:07:24 hssl1 kernel: Remounting filesystem read-only

I'm stress testing my file system by replaying 3 months of system call
traces back very rapidly.  My biggest question is what does the "journal
block not found" error mean?  Any other insights would be very helpful.

Thanks,
Zachary

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Zachary Peterson       zachary@xxxxxxxxxxxx
                       http://znjp.com

856D 29FA E1F7 DB5E 9215  C68D 5F0F 3929 C929 9A72




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