From: Hannes Reinecke Date: Tue, 2 Apr 2013 06:38:55 +0000 (+0200) Subject: md: Wait for md_check_recovery before attempting device removal. X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=90f5f7ad4f38d67626b0c220a0ac390603e0bded;p=sagit-ice-cold%2Fkernel_xiaomi_msm8998.git md: Wait for md_check_recovery before attempting device removal. When a device has failed, it needs to be removed from the personality module before it can be removed from the array as a whole. The first step is performed by md_check_recovery() which is called from the raid management thread. So when a HOT_REMOVE ioctl arrives, wait briefly for md_check_recovery to have run. This increases the chance that the ioctl will succeed. Signed-off-by: Hannes Reinecke Signed-off-by: Neil Brown --- diff --git a/drivers/md/md.c b/drivers/md/md.c index 9b82377a833b..3b25b72ef0b6 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -6405,6 +6405,12 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode, /* need to ensure md_delayed_delete() has completed */ flush_workqueue(md_misc_wq); + if (cmd == HOT_REMOVE_DISK) + /* need to ensure recovery thread has run */ + wait_event_interruptible_timeout(mddev->sb_wait, + !test_bit(MD_RECOVERY_NEEDED, + &mddev->flags), + msecs_to_jiffies(5000)); err = mddev_lock(mddev); if (err) { printk(KERN_INFO @@ -7892,6 +7898,8 @@ void md_check_recovery(struct mddev *mddev) md_new_event(mddev); } unlock: + wake_up(&mddev->sb_wait); + if (!mddev->sync_thread) { clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); if (test_and_clear_bit(MD_RECOVERY_RECOVER,