40a9efd0e8
This is primarily of use when a pool has lost its disk, while the user doesn't care about any pending (or otherwise) transactions. Implement various control methods to make this feasible: - txg_wait can now take a NOSUSPEND flag, in which case the caller will be alerted if their txg can't be committed. This is primarily of interest for callers that would normally pass TXG_WAIT, but don't want to wait if the pool becomes suspended, which allows unwinding in some cases, specifically when one is attempting a non-forced export. Without this, the non-forced export would preclude a forced export by virtue of holding the namespace lock indefinitely. - txg_wait also returns failure for TXG_WAIT users if a pool is actually being force exported. Adjust most callers to tolerate this. - spa_config_enter_flags now takes a NOSUSPEND flag to the same effect. - DMU objset initiator which may be set on an objset being forcibly exported / unmounted. - SPA export initiator may be set on a pool being forcibly exported. - DMU send/recv now use an interruption mechanism which relies on the SPA export initiator being able to enumerate datasets and closing any send/recv streams, causing their EINTR paths to be invoked. - ZIO now has a cancel entry point, which tells all suspended zios to fail, and which suppresses the failures for non-CANFAIL users. - metaslab, etc. cleanup, which consists of simply throwing away any changes that were not able to be synced out. - Linux specific: introduce a new tunable, zfs_forced_export_unmount_enabled, which allows the filesystem to remain in a modified 'unmounted' state upon exiting zpl_umount_begin, to achieve parity with FreeBSD and illumos, which have VFS-level support for yanking filesystems out from under users. However, this only helps when the user is actively performing I/O, while not sitting on the filesystem. In particular, this allows test #3 below to pass on Linux. - Add basic logic to zpool to indicate a force-exporting pool, instead of crashing due to lack of config, etc. Add tests which cover the basic use cases: - Force export while a send is in progress - Force export while a recv is in progress - Force export while POSIX I/O is in progress This change modifies the libzfs ABI: - New ZPOOL_STATUS_FORCE_EXPORTING zpool_status_t enum value. - New field libzfs_force_export for libzfs_handle. Signed-off-by: Will Andrews <will@firepipe.net> Signed-off-by: Allan Jude <allan@klarasystems.com> Signed-off-by: Mariusz Zaborski <mariusz.zaborski@klarasystems.com> Signed-off-by: Rob Norris <rob.norris@klarasystems.com> Sponsored-by: Klara, Inc. Sponsored-by: Catalogics, Inc. Sponsored-by: Wasabi Technology, Inc. Closes #3461 (cherry picked from commit 852e633772217d779a63e8c46fe3c5f81dd8960e) |
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|---|---|---|
| .. | ||
| Makefile.in | ||
| README.md | ||
| THIRDPARTYLICENSE.gplv2 | ||
| THIRDPARTYLICENSE.gplv2.descrip | ||
| spl-atomic.c | ||
| spl-condvar.c | ||
| spl-cred.c | ||
| spl-err.c | ||
| spl-generic.c | ||
| spl-kmem-cache.c | ||
| spl-kmem.c | ||
| spl-kstat.c | ||
| spl-proc.c | ||
| spl-procfs-list.c | ||
| spl-taskq.c | ||
| spl-thread.c | ||
| spl-trace.c | ||
| spl-tsd.c | ||
| spl-vmem.c | ||
| spl-xdr.c | ||
| spl-zlib.c | ||
README.md
The Solaris Porting Layer, SPL, is a Linux kernel module which provides a compatibility layer used by the OpenZFS project.
Installation
The latest version of the SPL is maintained as part of this repository. Only when building ZFS version 0.7.x or earlier must an external SPL release be used. These releases can be found at:
- Version 0.7.x: https://github.com/zfsonlinux/spl/tree/spl-0.7-release
- Version 0.6.5.x: https://github.com/zfsonlinux/spl/tree/spl-0.6.5-release
Release
The SPL is released under a GPLv2 license.
For more details see the NOTICE and THIRDPARTYLICENSE files; UCRL-CODE-235197