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md: MD_CLOSING needs to be cleared after called md_set_readonly or do_md_stop 

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@suse.com>
Fixes: af8d8e6f03 ("md: changes for MD_STILL_CLOSED flag")
Cc: stable@vger.kernel.org (v4.9+)
Signed-off-by: Zhilong Liu <zlliu@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
NeilBrown 2017-04-06 11:16:33 +08:00 committed by Shaohua Li
parent 6f287ca604
commit 065e519e71
1 changed files with 5 additions and 0 deletions
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5
drivers/md/md.c
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@ -6925,6 +6925,7 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
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;
@ -7014,7 +7015,9 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
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);
}
@ -7207,6 +7210,8 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
mddev->hold_active = 0;
mddev_unlock(mddev);
out:
if(did_set_md_closing)
clear_bit(MD_CLOSING, &mddev->flags);
return err;
}
#ifdef CONFIG_COMPAT