jbd: possible filesystem corruption fixes
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- v1 Latest4 patches 6 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/4 | jbd: strictly check for write errors on data buffersfs/ | +9 | 0 replies | |
| 2/4 | jbd: ordered data integrity fixfs/ | +13 | 0 replies | |
| 3/4 | jbd: abort when failed to log metadata buffersfs/ | +3 | 0 replies | |
| 4/4 | jbd/ext3: fix error handling for checkpoint iofs/ fs/ fs/ +3 more | +91 | 0 replies |
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Cover letter [PATCH 0/4] jbd: possible filesystem corruption fixes
Subject: [PATCH 0/4] jbd: possible filesystem corruption fixes
The current JBD is not sufficient for I/O error handling. It can
cause filesystem corruption. An example scenario:
1. fail to write a metadata buffer to block B in the journal
2. succeed to write the commit record
3. the system crashes, reboots and mount the filesystem
4. in the recovery phase, succeed to read data from block B
5. write back the read data to the filesystem, but it is a stale metadata
6. lose some files and directories!
This scenario is a rare case, but it (temporal I/O error) can occur. If we abort the journal between 1. and 2., this tragedy can be avoided.
This patch set fixes several error handling problems to protect from filesystem corruption caused by I/O errors. It has been done only for JBD and ext3 parts.
This patch is against 2.6.25
[PATCH 1/4] jbd: strictly check for write errors on data buffers [PATCH 2/4] jbd: ordered data integrity fix
[PATCH 3/4] jbd: abort when failed to log metadata buffers [PATCH 4/4] jbd: fix error handling for checkpoint io
Regards,
Signature · 3 lines
Hidehiro Kawai Hitachi, Systems Development Laboratory Linux Technology Center