34e143323e
Because we need to be more frugal about our stack usage under Linux. The __zio_execute() function was modified to re-dispatch zios to a ZIO_TASKQ_ISSUE thread when we're in a context which is known to be stack heavy. Those two contexts are the sync thread and what ever thread is performing spa initialization. Unfortunately, this change introduced an unlikely bug which can result in a zio being re-dispatched indefinitely and never being executed. If during spa initialization we handle a zio with ZIO_PRIORITY_NOW it will be moved to the high priority queue. When __zio_execute() is called again for the zio it will mis- interpret the context and re-dispatch it again. The system will get stuck spinning re-dispatching the zio and making no forward progress. To fix this rare issue __zio_execute() has been updated not to re-dispatch zios on either the ZIO_TASKQ_ISSUE or ZIO_TASKQ_ISSUE_HIGH task queues. In practice this issue was rarely reported and can usually be fixed by rebooting the system and importing the pool again. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1455 |
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README.markdown
Native ZFS for Linux!
ZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the Illumos community.
ZFS on Linux, which is also known as ZoL, is currently feature complete. It includes fully functional and stable SPA, DMU, ZVOL, and ZPL layers.
Full documentation for installing ZoL on your favorite Linux distribution can be found at: http://zfsonlinux.org