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fio_plugin: initalize when create_serialize=0

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When the fio plugin is used with reate_serialize set to false, fio calls
the init callback (spdk_fio_init()) before calling the setup callback
(spdk_fio_setup()). When create_serialize is true, spdk_fio_setup() is
called earlier.  Both spdk_fio_setup() and spdk_fio_init() call
functions that require that the SPDK libraries have been initialized.

While it is arguably a bug in SPDK that per-thread initialization
happens before global initialization, it is not terribly difficult to
work around in fio_plugin. The workaround implemented in this patch
splits the start of the plugin's init thread into its own function and
calls it from both spdk_fio_setup() and spdk_fio_init(). The init thread
is started while holding a mutex, and as before there is a guard to be
sure that the init thread is created only once.

Fixes issue #2843

Signed-off-by: Mike Gerdts <mgerdts@nvidia.com>
Change-Id: I20d1863a88b75b416283f9466ee1186d8ef05063
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/16053
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>
This commit is contained in:
Mike Gerdts 2022-12-21 12:27:28 -06:00 committed by Tomasz Zawadzki
parent 9b754587c7
commit 9e96e331c3
1 changed files with 26 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
examples/bdev/fio_plugin/fio_plugin.c
View File

@ -531,6 +531,26 @@ fio_redirected_to_dev_null(void)
return true;
}
static int
spdk_fio_init_spdk_env(struct thread_data *td)
{
static pthread_mutex_t setup_lock = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_lock(&setup_lock);
if (!g_spdk_env_initialized) {
if (spdk_fio_init_env(td)) {
pthread_mutex_unlock(&setup_lock);
SPDK_ERRLOG("failed to initialize\n");
return -1;
}
g_spdk_env_initialized = true;
}
pthread_mutex_unlock(&setup_lock);
return 0;
}
/* Called for each thread to fill in the 'real_file_size' member for
* each file associated with this thread. This is called prior to
* the init operation (spdk_fio_init()) below. This call will occur
@ -564,13 +584,8 @@ spdk_fio_setup(struct thread_data *td)
return -1;
}
if (!g_spdk_env_initialized) {
if (spdk_fio_init_env(td)) {
SPDK_ERRLOG("failed to initialize\n");
return -1;
}
g_spdk_env_initialized = true;
if (spdk_fio_init_spdk_env(td) != 0) {
return -1;
}
ctx.u.sa.td = td;
@ -709,6 +724,10 @@ spdk_fio_init(struct thread_data *td)
struct spdk_fio_thread *fio_thread;
int rc;
if (spdk_fio_init_spdk_env(td) != 0) {
return -1;
}
/* If thread has already been initialized, do nothing. */
if (td->io_ops_data) {
return 0;