From 4a5caa4af0df5cd8f1c7f0c2f871d382662b022e Mon Sep 17 00:00:00 2001
From: Milan Broz <gmazyland@gmail.com>
Date: Thu, 20 Aug 2020 19:45:38 +0200
Subject: [PATCH] dm crypt: document new no_workqueue flags
Git-commit: 4a5caa4af0df5cd8f1c7f0c2f871d382662b022e
Patch-mainline: v5.9-rc7
References: git-fixes

Commit 39d42fa96ba1 ("dm crypt: add flags to optionally bypass kcryptd
workqueues") introduced new dm-crypt 'no_read_workqueue' and
'no_write_workqueue' flags.

Add documentation to admin guide for them.

Fixes: 39d42fa96ba1 ("dm crypt: add flags to optionally bypass kcryptd workqueues")
Signed-off-by: Milan Broz <gmazyland@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Coly Li <colyli@suse.de>

---
 Documentation/admin-guide/device-mapper/dm-crypt.rst | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/admin-guide/device-mapper/dm-crypt.rst b/Documentation/admin-guide/device-mapper/dm-crypt.rst
index 8f4a3f889d43..40dc2df58cd5 100644
--- a/Documentation/admin-guide/device-mapper/dm-crypt.rst
+++ b/Documentation/admin-guide/device-mapper/dm-crypt.rst
@@ -121,6 +121,14 @@ submit_from_crypt_cpus
     thread because it benefits CFQ to have writes submitted using the
     same context.
 
+no_read_workqueue
+    Bypass dm-crypt internal workqueue and process read requests synchronously.
+
+no_write_workqueue
+    Bypass dm-crypt internal workqueue and process write requests synchronously.
+    This option is automatically enabled for host-managed zoned block devices
+    (e.g. host-managed SMR hard-disks).
+
 integrity:<bytes>:<type>
     The device requires additional <bytes> metadata per-sector stored
     in per-bio integrity structure. This metadata must by provided
-- 
2.26.2