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Serapheim Dimitropoulos 1c4b0fc745 Race condition between spa async threads and export

In the past we've seen multiple race conditions that have
to do with open-context threads async threads and concurrent
calls to spa_export()/spa_destroy() (including the one
referenced in issue #9015).

This patch ensures that only one thread can execute the
main body of spa_export_common() at a time, with subsequent
threads returning with a new error code created just for
this situation, eliminating this way any race condition
bugs introduced by concurrent calls to this function.

Reviewed by: Matt Ahrens <matt@delphix.com>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Serapheim Dimitropoulos <serapheim@delphix.com>
Closes #9015
Closes #9044

2019-09-25 11:27:50 -07:00

linux

Minor style cleanup

2019-09-25 11:27:49 -07:00

spl

Retire unused spl_{mutex,rwlock}_{init_fini}

2019-09-25 11:27:49 -07:00

sys

Race condition between spa async threads and export

2019-09-25 11:27:50 -07:00

.gitignore

Create /proc/sys/kernel/spl/gitrev with git hash