2724bcb3d6
zil_commit() has always returned void, and thus, cannot fail. Everything inside it assumed that if anything ever went wrong, it could fall back on txg_wait_synced() until the txg covering the operations being flushed from the ZIL has fully committed. This meant that if the pool failed and failmode=continue was set, syncing operations like fsync() would still block. Unblocking zil_commit() means largely the same approach. The difficulty is that the ZIL carries the record of uncommitted VFS operations (vs the changed data), and attached to those, callbacks and cvs that will release userspace callers once the data is on disk. So if we can't write the ZIL, we also can't release those records until the data is on disk. This wasn't a problem before, because the zil_commit() would block. If we change zil_commit() to return error, we still need to track those entries until the data they represent hits the disk. We also need to accept new records; just because the ZIL fails may not necessarily mean the pool itself is unavailable. This commit reorganises the ZIL to allow zil_commit() to return failure. If ZIL writes or flushes fail, the ZIL is moved into a "failed" state, and no further writes are done; all zil_commit() calls are serviced by the regular txg mechanism. Outstanding records (itx_ts) are held until the main pool writes their associated txg out. The records are then released. Once all records are cleared, the ZIL is reset and reopened. Signed-off-by: Rob Norris <rob.norris@klarasystems.com> (cherry picked from commit af821006f6602261e690fe6635689cabdeefcadf) |
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README.md
OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.
Official Resources
- Documentation - for using and developing this repo
- ZoL Site - Linux release info & links
- Mailing lists
- OpenZFS site - for conference videos and info on other platforms (illumos, OSX, Windows, etc)
Installation
Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.
Contribute & Develop
We have a separate document with contribution guidelines.
We have a Code of Conduct.
Release
OpenZFS is released under a CDDL license.
For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197
Supported Kernels
- The
METAfile contains the officially recognized supported Linux kernel versions. - Supported FreeBSD versions are any supported branches and releases starting from 12.2-RELEASE.