lib/ftl: Check if IO channel is fully initialized

Since part of FTL IO channel initialization is done
asynchronously we need to check if IO channel is fully
initialized before write.

Change-Id: I0dff6a057024ffeb16b57ca5d7484f148b6fee82
Signed-off-by: Wojciech Malikowski <wojciech.malikowski@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/1177
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Konrad Sztyber <konrad.sztyber@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>

lib/ftl/ftl_core.c

@@ -2144,6 +2144,13 @@ void
 ftl_io_write(struct ftl_io *io)
 {
 	struct spdk_ftl_dev *dev = io->dev;
+	struct ftl_io_channel *ioch = ftl_io_channel_get_ctx(io->ioch);
+
+	/* Put the IO on retry queue in case IO channel is not initialized */
+	if (spdk_unlikely(ioch->index == FTL_IO_CHANNEL_INDEX_INVALID)) {
+		TAILQ_INSERT_TAIL(&ioch->retry_queue, io, ioch_entry);
+		return;
+	}
 
 	/* For normal IOs we just need to copy the data onto the write buffer */
 	if (!(io->flags & FTL_IO_MD)) {

lib/ftl/ftl_init.c

@@ -1110,6 +1110,7 @@ ftl_io_channel_create_cb(void *io_device, void *ctx)
 	}
 
 	ioch->cache_ioch = NULL;
+	ioch->index = FTL_IO_CHANNEL_INDEX_INVALID;
 	ioch->dev = dev;
 	ioch->elem_size = sizeof(struct ftl_md_io);
 	ioch->io_pool = spdk_mempool_create(mempool_name,

lib/ftl/ftl_io.h

@@ -157,6 +157,8 @@ struct ftl_wbuf_entry {
 	TAILQ_ENTRY(ftl_wbuf_entry)		tailq;
 };
 
+#define FTL_IO_CHANNEL_INDEX_INVALID ((uint64_t)-1)
+
 struct ftl_io_channel {
 	/* Device */
 	struct spdk_ftl_dev			*dev;