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md: remove special meaning of ->quiesce(.., 2)

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The '2' argument means "wake up anything that is waiting".
This is an inelegant part of the design and was added
to help support management of suspend_lo/suspend_hi setting.
Now that suspend_lo/hi is managed in mddev_suspend/resume,
that need is gone.
These is still a couple of places where we call 'quiesce'
with an argument of '2', but they can safely be changed to
call ->quiesce(.., 1); ->quiesce(.., 0) which
achieve the same result at the small cost of pausing IO
briefly.

This removes a small "optimization" from suspend_{hi,lo}_store,
but it isn't clear that optimization served a useful purpose.
The code now is a lot clearer.

Suggested-by: Shaohua Li <shli@kernel.org>
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
NeilBrown
2017-10-19 12:49:15 +11:00
committed by Shaohua Li
parent 35bfc52187
commit b03e0ccb5a
9 changed files with 37 additions and 69 deletions
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18
drivers/md/raid5.c
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@@ -8008,16 +8008,12 @@ static void raid5_finish_reshape(struct mddev *mddev)
}
}
static void raid5_quiesce(struct mddev *mddev, int state)
static void raid5_quiesce(struct mddev *mddev, int quiesce)
{
struct r5conf *conf = mddev->private;
switch(state) {
case 2: /* resume for a suspend */
wake_up(&conf->wait_for_overlap);
break;
case 1: /* stop all writes */
if (quiesce) {
/* stop all writes */
lock_all_device_hash_locks_irq(conf);
/* '2' tells resync/reshape to pause so that all
* active stripes can drain
@@ -8033,17 +8029,15 @@ static void raid5_quiesce(struct mddev *mddev, int state)
unlock_all_device_hash_locks_irq(conf);
/* allow reshape to continue */
wake_up(&conf->wait_for_overlap);
break;
case 0: /* re-enable writes */
} else {
/* re-enable writes */
lock_all_device_hash_locks_irq(conf);
conf->quiesce = 0;
wake_up(&conf->wait_for_quiescent);
wake_up(&conf->wait_for_overlap);
unlock_all_device_hash_locks_irq(conf);
break;
}
r5l_quiesce(conf->log, state);
r5l_quiesce(conf->log, quiesce);
}
static void *raid45_takeover_raid0(struct mddev *mddev, int level)