linux-kernel - [PATCH 24/60] md: set NO_MP for request queue of md

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Date:   Sat, 29 Oct 2016 16:08:23 +0800
From:   Ming Lei <tom.leiming@...il.com>
To:     Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org
Cc:     linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Christoph Hellwig <hch@...radead.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Ming Lei <tom.leiming@...il.com>, Shaohua Li <shli@...nel.org>,
        linux-raid@...r.kernel.org (open list:SOFTWARE RAID (Multiple Disks)
        SUPPORT)
Subject: [PATCH 24/60] md: set NO_MP for request queue of md

MD isn't ready for multipage bvecs, so mark it as
NO_MP.

Signed-off-by: Ming Lei <tom.leiming@...il.com>
---
 drivers/md/md.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index eac84d8ff724..f8d98098dff8 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5128,6 +5128,16 @@ static void md_safemode_timeout(unsigned long data)
 
 static int start_dirty_degraded;
 
+/*
+ * MD isn't ready for multipage bvecs yet, and set the flag
+ * so that MD still can see singlepage bvecs bio
+ */
+static inline void md_set_no_mp(struct mddev *mddev)
+{
+	if (mddev->queue)
+		set_bit(QUEUE_FLAG_NO_MP, &mddev->queue->queue_flags);
+}
+
 int md_run(struct mddev *mddev)
 {
 	int err;
@@ -5353,6 +5363,8 @@ int md_run(struct mddev *mddev)
 	if (mddev->flags & MD_UPDATE_SB_FLAGS)
 		md_update_sb(mddev, 0);
 
+	md_set_no_mp(mddev);
+
 	md_new_event(mddev);
 	sysfs_notify_dirent_safe(mddev->sysfs_state);
 	sysfs_notify_dirent_safe(mddev->sysfs_action);
-- 
2.7.4