[PATCH v5 1/8] md: Introduce md_stop_all_writes()

[Bart Van Assche]

Introduce md_stop_all_writes() because the next patch will add
a second caller for this function. Rename md_notifier into
md_reboot_notifier to avoid that the name of this notifier will
become confusing due to the next patch. This patch does not
change any functionality.

Signed-off-by: Bart Van Assche <bart.vanass...@wdc.com>
Cc: Shaohua Li <s...@kernel.org>
Cc: linux-r...@vger.kernel.org
Cc: Ming Lei <ming....@redhat.com>
Cc: Christoph Hellwig <h...@lst.de>
Cc: Hannes Reinecke <h...@suse.com>
Cc: Johannes Thumshirn <jthumsh...@suse.de>
---
 drivers/md/md.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 0ff1bbf6c90e..3f7426120a3b 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -8935,8 +8935,7 @@ int rdev_clear_badblocks(struct md_rdev *rdev, sector_t 
s, int sectors,
 }
 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
 
-static int md_notify_reboot(struct notifier_block *this,
-                           unsigned long code, void *x)
+static void md_stop_all_writes(void)
 {
        struct list_head *tmp;
        struct mddev *mddev;
@@ -8960,11 +8959,17 @@ static int md_notify_reboot(struct notifier_block *this,
         */
        if (need_delay)
                mdelay(1000*1);
+}
+
+static int md_notify_reboot(struct notifier_block *this,
+                           unsigned long code, void *x)
+{
+       md_stop_all_writes();
 
        return NOTIFY_DONE;
 }
 
-static struct notifier_block md_notifier = {
+static struct notifier_block md_reboot_notifier = {
        .notifier_call  = md_notify_reboot,
        .next           = NULL,
        .priority       = INT_MAX, /* before any real devices */
@@ -9001,7 +9006,7 @@ static int __init md_init(void)
        blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
                            md_probe, NULL, NULL);
 
-       register_reboot_notifier(&md_notifier);
+       register_reboot_notifier(&md_reboot_notifier);
        raid_table_header = register_sysctl_table(raid_root_table);
 
        md_geninit();
@@ -9241,7 +9246,7 @@ static __exit void md_exit(void)
 
        unregister_blkdev(MD_MAJOR,"md");
        unregister_blkdev(mdp_major, "mdp");
-       unregister_reboot_notifier(&md_notifier);
+       unregister_reboot_notifier(&md_reboot_notifier);
        unregister_sysctl_table(raid_table_header);
 
        /* We cannot unload the modules while some process is
-- 
2.14.1