This is a rework of commit 7722996dd2.
As the locks in bdev.c transition to spdk_spinlock, callers of
spdk_bdev_get_by_name() and any other function that uses an SPDK
spinlock needs to be executing from an spdk_thread. This commit reverts
the earlier commit then fixes it with a different approach than was
previously used.
fio plugin functions that need to be on an SPDK thread into two parts:
1. fio API callback: transform args from fio into a spdk_fio_oat_ctx
structure, then calls spdk_fio_sync_run_oat(). In the case of
spdk_fio_setup(), the app thread is started in this part.
2. On App Thread (oat) callback: runs on the SPDK app thread via the
poller spdk_init_thread_poll().
spdk_fio_sync_run_oat() sends a message to the app thread to have the
specified oat callback run. It wakees the poller loop via a condition
variable then waits for the oat callback to signal its completion via a
condition variable in the spdk_fio_oat_ctx.
Fixes issue #2818
Signed-off-by: Mike Gerdts <mgerdts@nvidia.com>
Change-Id: I5c82542bb9e9e6b8823e9d1da293050bba336b65
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/15866
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
9b754587c7