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drbd: If we detect late that IO got frozen, retry after we thawed.

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If we detect late (= after grabing mdev->req_lock) that IO got frozen, we
return 1 to generic_make_request(), which simply will retry to make a
request for that bio.

In the subsequent call of generic_make_request() into drbd_make_request_26()
we sleep in inc_ap_bio().

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner
2010-05-10 16:42:23 +02:00
parent a1c88d0d7a
commit 9a25a04c80
2 changed files with 28 additions and 9 deletions
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drivers/block/drbd/drbd_int.h
+2 -2
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@@ -2223,7 +2223,7 @@ static inline int __inc_ap_bio_cond(struct drbd_conf *mdev)
/* I'd like to use wait_event_lock_irq,
* but I'm not sure when it got introduced,
* and not sure when it has 3 or 4 arguments */
static inline void inc_ap_bio(struct drbd_conf *mdev, int one_or_two)
static inline void inc_ap_bio(struct drbd_conf *mdev, int count)
{
/* compare with after_state_ch,
* os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S */
@@ -2245,7 +2245,7 @@ static inline void inc_ap_bio(struct drbd_conf *mdev, int one_or_two)
finish_wait(&mdev->misc_wait, &wait);
spin_lock_irq(&mdev->req_lock);
}
atomic_add(one_or_two, &mdev->ap_bio_cnt);
atomic_add(count, &mdev->ap_bio_cnt);
spin_unlock_irq(&mdev->req_lock);
}