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Volume restores work by overwriting vnodes with the data in the given volume dump. If we restore a partial incremental dump from an older version of the volume, this generally results in a partly-corrupted volume, since directory vnodes may contain references that don't exist in the current version of the volume (or are supposed to be in a different directory). Currently, the volserver does not prevent restoring older volume data to a volume, and this doesn't necessarily always result in corrupted data (for instance, if we are restoring a full volume dump over an existing volume). But restoring old volume data seems more likely to be a mistake, since reverting a volume back to an old version, even without corrupting data, is a strange thing to do and may cause problems with our methods of cache consistency. So, log a warning when this happens, so if this is a mistake, it doesn't happen silently. But we still do not prevent this action, since it's possible something could be doing this intentionally. We detect this just by checking if the updateDate in the given header is older than the current updateDate for the volume on disk. Note: Restoring a full dump file (-overwrite f) will not result in corrupted data. In this scenario, the restore operation removes the volume on disk first (if present). After that, the dump file is restored. In this case, we do not log anything (the volume is not corrupted). Change-Id: Iac55cc8bb1406ca6af9a5e43e7d37c6bfa889e91 Reviewed-on: https://gerrit.openafs.org/13251 Tested-by: BuildBot <buildbot@rampaginggeek.com> Reviewed-by: Benjamin Kaduk <kaduk@mit.edu> |
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| CODING | ||
| configure-libafs.ac | ||
| configure.ac | ||
| CONTRIBUTING | ||
| INSTALL | ||
| libafsdep | ||
| LICENSE | ||
| Makefile-libafs.in | ||
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AFS is a distributed file system that enables users to share and access all of the files stored in a network of computers as easily as they access the files stored on their local machines. The file system is called distributed for this exact reason: files can reside on many different machines, but are available to users on every machine. OpenAFS 1.0 was originally released by IBM under the terms of the IBM Public License 1.0 (IPL10). For details on IPL10 see the LICENSE file in this directory. The current OpenAFS distribution is licensed under a combination of the IPL10 and many other licenses as granted by the relevant copyright holders. The LICENSE file in this directory contains more details, thought it is not a comprehensive statement. See INSTALL for information about building and installing OpenAFS on various platforms. See CODING for developer information and guidelines. See NEWS for recent changes to OpenAFS.