zfs/lib/libzpool
Boris Protopopov 9d02f9557f Add support for asynchronous zvol minor operations
zfsonlinux issue #2217 - zvol minor operations: check snapdev
property before traversing snapshots of a dataset

zfsonlinux issue #3681 - lock order inversion between zvol_open()
and dsl_pool_sync()...zvol_rename_minors()

Create a per-pool zvol taskq for asynchronous zvol tasks.
There are a few key design decisions to be aware of.

* Each taskq must be single threaded to ensure tasks are always
  processed in the order in which they were dispatched.

* There is a taskq per-pool in order to keep the pools independent.
  This way if one pool is suspended it will not impact another.

* The preferred location to dispatch a zvol minor task is a sync
  task.  In this context there is easy access to the spa_t and
  minimal error handling is required because the sync task must
  succeed.

Support for asynchronous zvol minor operations address issue #3681.

Signed-off-by: Boris Protopopov <boris.protopopov@actifio.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2217
Closes #3678
Closes #3681
2016-03-22 18:08:04 -07:00
..
Makefile.am Support parallel build trees (VPATH builds) 2015-07-17 13:42:51 -07:00
kernel.c Add support for asynchronous zvol minor operations 2016-03-22 18:08:04 -07:00
taskq.c Align thread priority with Linux defaults 2015-07-28 13:36:47 -07:00
util.c Fix gcc cast warnings 2010-08-27 15:33:32 -07:00