Commit fca4d848 authored by NeilBrown's avatar NeilBrown Committed by Linus Torvalds
Browse files

[PATCH] md: merge md_enter_safemode into md_check_recovery 



md_enter_safemode checks if it is time to mark the md superblock as 'clean'.
i.e.  if all writes have completed and a suitable delay has passed.

This is currently called from md_handle_safemode which in-turn is called
(almost) every time md_check_recovery is called, and from the end of
md_do_sync which causes the mddev->thread to run, which will always call
md_check_recovery as well.

So it doesn't need to be a separate function and fits quite well into
md_check_recovery.

The "almost" is because multipathd calls md_check_recovery but not
md_handle_safemode.  This is OK because the code from md_enter_safemode is a
no-op if mddev->safemode == 0, which it always is for a multipathd (providing
we don't allow it to be set to 2 on a signal...)

Signed-off-by: default avatarNeil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent c361777f

drivers/md/md.c

+24 −34
Original line number Diff line number Diff line
@@ -3203,37 +3203,6 @@ void md_write_end(mddev_t *mddev) 
	}

}



static inline void md_enter_safemode(mddev_t *mddev)

{

	if (!mddev->safemode) return;

	if (mddev->safemode == 2 &&

	    (atomic_read(&mddev->writes_pending) || mddev->in_sync ||

		    mddev->recovery_cp != MaxSector))

		return; /* avoid the lock */

	mddev_lock_uninterruptible(mddev);

	if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&

	    !mddev->in_sync && mddev->recovery_cp == MaxSector) {

		mddev->in_sync = 1;

		md_update_sb(mddev);

	}

	mddev_unlock(mddev);



	if (mddev->safemode == 1)

		mddev->safemode = 0;

}



void md_handle_safemode(mddev_t *mddev)

{

	if (signal_pending(current)) {

		printk(KERN_INFO "md: %s in immediate safe mode\n",

			mdname(mddev));

		mddev->safemode = 2;

		flush_signals(current);

	}

	md_enter_safemode(mddev);

}





static DECLARE_WAIT_QUEUE_HEAD(resync_wait);



#define SYNC_MARKS	10
@@ -3449,7 +3418,6 @@ static void md_do_sync(mddev_t *mddev) 
			mddev->recovery_cp = MaxSector;

	}



	md_enter_safemode(mddev);

 skip:

	mddev->curr_resync = 0;

	wake_up(&resync_wait);
@@ -3490,14 +3458,37 @@ void md_check_recovery(mddev_t *mddev) 


	if (mddev->ro)

		return;



	if (signal_pending(current)) {

		if (mddev->pers->sync_request) {

			printk(KERN_INFO "md: %s in immediate safe mode\n",

			       mdname(mddev));

			mddev->safemode = 2;

		}

		flush_signals(current);

	}



	if ( ! (

		mddev->sb_dirty ||

		test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||

		test_bit(MD_RECOVERY_DONE, &mddev->recovery)

		test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||

		(mddev->safemode == 1) ||

		(mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)

		 && !mddev->in_sync && mddev->recovery_cp == MaxSector)

		))

		return;



	if (mddev_trylock(mddev)==0) {

		int spares =0;



		if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&

		    !mddev->in_sync && mddev->recovery_cp == MaxSector) {

			mddev->in_sync = 1;

			mddev->sb_dirty = 1;

		}

		if (mddev->safemode == 1)

			mddev->safemode = 0;



		if (mddev->sb_dirty)

			md_update_sb(mddev);

		if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
@@ -3741,7 +3732,6 @@ EXPORT_SYMBOL(md_error); 
EXPORT_SYMBOL(md_done_sync);

EXPORT_SYMBOL(md_write_start);

EXPORT_SYMBOL(md_write_end);

EXPORT_SYMBOL(md_handle_safemode);

EXPORT_SYMBOL(md_register_thread);

EXPORT_SYMBOL(md_unregister_thread);

EXPORT_SYMBOL(md_wakeup_thread);

drivers/md/raid1.c

+0 −1
Original line number Diff line number Diff line
@@ -931,7 +931,6 @@ static void raid1d(mddev_t *mddev) 
	mdk_rdev_t *rdev;



	md_check_recovery(mddev);

	md_handle_safemode(mddev);

	

	for (;;) {

		char b[BDEVNAME_SIZE];

drivers/md/raid10.c

+0 −1
Original line number Diff line number Diff line
@@ -1216,7 +1216,6 @@ static void raid10d(mddev_t *mddev) 
	mdk_rdev_t *rdev;



	md_check_recovery(mddev);

	md_handle_safemode(mddev);



	for (;;) {

		char b[BDEVNAME_SIZE];

drivers/md/raid5.c

+0 −1
Original line number Diff line number Diff line
@@ -1546,7 +1546,6 @@ static void raid5d (mddev_t *mddev) 
	PRINTK("+++ raid5d active\n");



	md_check_recovery(mddev);

	md_handle_safemode(mddev);



	handled = 0;

	spin_lock_irq(&conf->device_lock);

drivers/md/raid6main.c

+0 −1
Original line number Diff line number Diff line
@@ -1705,7 +1705,6 @@ static void raid6d (mddev_t *mddev) 
	PRINTK("+++ raid6d active\n");



	md_check_recovery(mddev);

	md_handle_safemode(mddev);



	handled = 0;

	spin_lock_irq(&conf->device_lock);

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