From 32db80f6f6326617ed40b2d157709226af4f062b Mon Sep 17 00:00:00 2001 From: Philipp Reisner Date: Wed, 22 Feb 2012 11:51:57 +0100 Subject: [PATCH] drbd: Consider the disk-timeout also for meta-data IO operations If the backing device is already frozen during attach, we failed to recognize that. The current disk-timeout code works on top of the drbd_request objects. During attach we do not allow IO and therefore never generate a drbd_request object but block before that in drbd_make_request(). This patch adds the timeout to all drbd_md_sync_page_io(). Before this patch we used to go from D_ATTACHING directly to D_DISKLESS if IO failed during attach. We can no longer do this since we have to stay in D_FAILED until all IO ops issued to the backing device returned. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg --- drivers/block/drbd/drbd_actlog.c | 18 +++++++++-- drivers/block/drbd/drbd_bitmap.c | 4 +-- drivers/block/drbd/drbd_int.h | 3 +- drivers/block/drbd/drbd_state.c | 54 +++++++++++++++++--------------- 4 files changed, 48 insertions(+), 31 deletions(-) diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c index d69fb7d61817..b2355994a4d6 100644 --- a/drivers/block/drbd/drbd_actlog.c +++ b/drivers/block/drbd/drbd_actlog.c @@ -129,9 +129,21 @@ static bool md_io_allowed(struct drbd_conf *mdev) return ds >= D_NEGOTIATING || ds == D_ATTACHING; } -void wait_until_done_or_disk_failure(struct drbd_conf *mdev, unsigned int *done) +void wait_until_done_or_disk_failure(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, + unsigned int *done) { - wait_event(mdev->misc_wait, *done || !md_io_allowed(mdev)); + long dt; + + rcu_read_lock(); + dt = rcu_dereference(bdev->disk_conf)->disk_timeout; + rcu_read_unlock(); + dt = dt * HZ / 10; + if (dt == 0) + dt = MAX_SCHEDULE_TIMEOUT; + + dt = wait_event_timeout(mdev->misc_wait, *done || !md_io_allowed(mdev), dt); + if (dt == 0) + dev_err(DEV, "meta-data IO operation timed out\n"); } static int _drbd_md_sync_page_io(struct drbd_conf *mdev, @@ -171,7 +183,7 @@ static int _drbd_md_sync_page_io(struct drbd_conf *mdev, bio_endio(bio, -EIO); else submit_bio(rw, bio); - wait_until_done_or_disk_failure(mdev, &mdev->md_io.done); + wait_until_done_or_disk_failure(mdev, bdev, &mdev->md_io.done); if (bio_flagged(bio, BIO_UPTODATE)) err = mdev->md_io.error; diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c index e63dcd9aada6..ef6a79b46dfa 100644 --- a/drivers/block/drbd/drbd_bitmap.c +++ b/drivers/block/drbd/drbd_bitmap.c @@ -1123,7 +1123,7 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned flags, unsigned lazy_w * "in_flight reached zero, all done" event. */ if (!atomic_dec_and_test(&ctx->in_flight)) - wait_until_done_or_disk_failure(mdev, &ctx->done); + wait_until_done_or_disk_failure(mdev, mdev->ldev, &ctx->done); else kref_put(&ctx->kref, &bm_aio_ctx_destroy); @@ -1242,7 +1242,7 @@ int drbd_bm_write_page(struct drbd_conf *mdev, unsigned int idx) __must_hold(loc } bm_page_io_async(ctx, idx, WRITE_SYNC); - wait_until_done_or_disk_failure(mdev, &ctx->done); + wait_until_done_or_disk_failure(mdev, mdev->ldev, &ctx->done); if (ctx->error) drbd_chk_io_error(mdev, 1, true); diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h index e8461f8cb046..b914f566ef36 100644 --- a/drivers/block/drbd/drbd_int.h +++ b/drivers/block/drbd/drbd_int.h @@ -1428,7 +1428,8 @@ extern void drbd_md_put_buffer(struct drbd_conf *mdev); extern int drbd_md_sync_page_io(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, sector_t sector, int rw); extern void drbd_ov_out_of_sync_found(struct drbd_conf *, sector_t, int); -extern void wait_until_done_or_disk_failure(struct drbd_conf *mdev, unsigned int *done); +extern void wait_until_done_or_disk_failure(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, + unsigned int *done); extern void drbd_rs_controller_reset(struct drbd_conf *mdev); static inline void ov_out_of_sync_print(struct drbd_conf *mdev) diff --git a/drivers/block/drbd/drbd_state.c b/drivers/block/drbd/drbd_state.c index c0563a1aac4d..96fdbfa79a6c 100644 --- a/drivers/block/drbd/drbd_state.c +++ b/drivers/block/drbd/drbd_state.c @@ -1308,37 +1308,41 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os, /* first half of local IO error, failure to attach, * or administrative detach */ if (os.disk != D_FAILED && ns.disk == D_FAILED) { - enum drbd_io_error_p eh; - int was_io_error; + enum drbd_io_error_p eh = EP_PASS_ON; + int was_io_error = 0; /* corresponding get_ldev was in __drbd_set_state, to serialize - * our cleanup here with the transition to D_DISKLESS, - * so it is safe to dreference ldev here. */ - rcu_read_lock(); - eh = rcu_dereference(mdev->ldev->disk_conf)->on_io_error; - rcu_read_unlock(); - was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags); + * our cleanup here with the transition to D_DISKLESS. + * But is is still not save to dreference ldev here, since + * we might come from an failed Attach before ldev was set. */ + if (mdev->ldev) { + rcu_read_lock(); + eh = rcu_dereference(mdev->ldev->disk_conf)->on_io_error; + rcu_read_unlock(); - /* Immediately allow completion of all application IO, that waits - for completion from the local disk. */ - tl_abort_disk_io(mdev); + was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags); - /* current state still has to be D_FAILED, - * there is only one way out: to D_DISKLESS, - * and that may only happen after our put_ldev below. */ - if (mdev->state.disk != D_FAILED) - dev_err(DEV, - "ASSERT FAILED: disk is %s during detach\n", - drbd_disk_str(mdev->state.disk)); + /* Immediately allow completion of all application IO, that waits + for completion from the local disk. */ + tl_abort_disk_io(mdev); - if (ns.conn >= C_CONNECTED) - drbd_send_state(mdev, ns); + /* current state still has to be D_FAILED, + * there is only one way out: to D_DISKLESS, + * and that may only happen after our put_ldev below. */ + if (mdev->state.disk != D_FAILED) + dev_err(DEV, + "ASSERT FAILED: disk is %s during detach\n", + drbd_disk_str(mdev->state.disk)); - drbd_rs_cancel_all(mdev); + if (ns.conn >= C_CONNECTED) + drbd_send_state(mdev, ns); - /* In case we want to get something to stable storage still, - * this may be the last chance. - * Following put_ldev may transition to D_DISKLESS. */ - drbd_md_sync(mdev); + drbd_rs_cancel_all(mdev); + + /* In case we want to get something to stable storage still, + * this may be the last chance. + * Following put_ldev may transition to D_DISKLESS. */ + drbd_md_sync(mdev); + } put_ldev(mdev); if (was_io_error && eh == EP_CALL_HELPER) -- 2.34.1