This is a note to let you know that I've just added the patch titled
md: MD_CLOSING needs to be cleared after called md_set_readonly or do_md_stop
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
md-md_closing-needs-to-be-cleared-after-called-md_set_readonly-or-do_md_stop.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 065e519e71b2c1f41936cce75b46b5ab34adb588 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@xxxxxxxx>
Date: Thu, 6 Apr 2017 11:16:33 +0800
Subject: md: MD_CLOSING needs to be cleared after called md_set_readonly or do_md_stop
From: NeilBrown <neilb@xxxxxxxx>
commit 065e519e71b2c1f41936cce75b46b5ab34adb588 upstream.
if called md_set_readonly and set MD_CLOSING bit, the mddev cannot
be opened any more due to the MD_CLOING bit wasn't cleared. Thus it
needs to be cleared in md_ioctl after any call to md_set_readonly()
or do_md_stop().
Signed-off-by: NeilBrown <neilb@xxxxxxxx>
Fixes: af8d8e6f0315 ("md: changes for MD_STILL_CLOSED flag")
Signed-off-by: Zhilong Liu <zlliu@xxxxxxxx>
Signed-off-by: Shaohua Li <shli@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/md.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -6752,6 +6752,7 @@ static int md_ioctl(struct block_device
void __user *argp = (void __user *)arg;
struct mddev *mddev = NULL;
int ro;
+ bool did_set_md_closing = false;
if (!md_ioctl_valid(cmd))
return -ENOTTY;
@@ -6841,7 +6842,9 @@ static int md_ioctl(struct block_device
err = -EBUSY;
goto out;
}
+ WARN_ON_ONCE(test_bit(MD_CLOSING, &mddev->flags));
set_bit(MD_CLOSING, &mddev->flags);
+ did_set_md_closing = true;
mutex_unlock(&mddev->open_mutex);
sync_blockdev(bdev);
}
@@ -7041,6 +7044,8 @@ unlock:
mddev->hold_active = 0;
mddev_unlock(mddev);
out:
+ if(did_set_md_closing)
+ clear_bit(MD_CLOSING, &mddev->flags);
return err;
}
#ifdef CONFIG_COMPAT
Patches currently in stable-queue which might be from neilb@xxxxxxxx are
queue-4.9/md-md_closing-needs-to-be-cleared-after-called-md_set_readonly-or-do_md_stop.patch
queue-4.9/md-update-slab_cache-before-releasing-new-stripes-when-stripes-resizing.patch