From 0f12c406d1e9d960f3432ea3009fe7b80d667d72 Mon Sep 17 00:00:00 2001
From: Wojciech Malikowski <wojciech.malikowski@intel.com>
Date: Wed, 20 Feb 2019 08:50:00 -0500
Subject: [PATCH] lib/ftl: Propagate ENOMEM error during read to upper layer

ENOMEM is expected when nvme_qpair will be out of resources.
In such a case ENOMEM shall be propagated to allow upper (bdev)
layer proper handling.

Change-Id: Ie647c2d3efff24a8de949a22ac42a31dfd0e78b7
Signed-off-by: Wojciech Malikowski <wojciech.malikowski@intel.com>
Reviewed-on: https://review.gerrithub.io/c/445580
Reviewed-by: Jakub Radtke <jakub.radtke@intel.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
---
 lib/ftl/ftl_core.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/ftl/ftl_core.c b/lib/ftl/ftl_core.c
index e13a80e49..1ae75d83e 100644
--- a/lib/ftl/ftl_core.c
+++ b/lib/ftl/ftl_core.c
@@ -733,10 +733,14 @@ ftl_submit_read(struct ftl_io *io, ftl_next_ppa_fn next_ppa,
 					   ftl_io_iovec_addr(io),
 					   ftl_ppa_addr_pack(io->dev, ppa), lbk_cnt,
 					   ftl_io_cmpl_cb, io, 0);
-		if (rc) {
+
+		if (rc != 0 && rc != -ENOMEM) {
 			SPDK_ERRLOG("spdk_nvme_ns_cmd_read failed with status: %d\n", rc);
 			io->status = -EIO;
 			break;
+		} else if (rc == -ENOMEM) {
+			io->status = rc;
+			break;
 		}
 
 		ftl_io_update_iovec(io, lbk_cnt);