drbd: Fix: Do not detach, if a bio with a barrier fails

Introduced a few days ago:
commit 45bb912bd5ea4d2b3a270a93cbdf767a0e2df6f5
Author: Lars Ellenberg <lars.ellenberg@linbit.c

drbd: Fix: Do not detach, if a bio with a barrier fails

Introduced a few days ago:
commit 45bb912bd5ea4d2b3a270a93cbdf767a0e2df6f5
Author: Lars Ellenberg <lars.ellenberg@linbit.com>
Date: Fri May 14 17:10:48 2010 +0200

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

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drbd: allow resync requests to be larger than max_segment_size

this should allow for better background resync performance.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com

drbd: allow resync requests to be larger than max_segment_size

this should allow for better background resync performance.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

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drbd: Allow drbd_epoch_entries to use multiple bios.
This should allow for better performance if the lower level IO stack
of the peers differs in limits exposed either via the queue,
or v

drbd: Allow drbd_epoch_entries to use multiple bios.
This should allow for better performance if the lower level IO stack
of the peers differs in limits exposed either via the queue,
or via some merge_bvec_fn.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

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drbd: Control the actual resync rate based on the queuing delay of data packets

In a setup with a high bandwidth and high latency network, eventually
involving deep queues in routers, it

drbd: Control the actual resync rate based on the queuing delay of data packets

In a setup with a high bandwidth and high latency network, eventually
involving deep queues in routers, it is beneficial to only fill those
queues up to an limited extend with resync data.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

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drbd: don't expose failed local READ to upper layers

fix regression introduced in 8.3.3:
commit a9b17323f2875f5d9b132c2b476a750bf44b10c7
Author: Lars Ellenberg <lars.ellenberg@linb

drbd: don't expose failed local READ to upper layers

fix regression introduced in 8.3.3:
commit a9b17323f2875f5d9b132c2b476a750bf44b10c7
Author: Lars Ellenberg <lars.ellenberg@linbit.com>
Date: Wed Aug 12 15:18:33 2009 +0200

out-of-spinlock completion of master bio

: (bio_rw(bio) == READA)
? read_completed_with_error
: read_ahead_completed_with_error;

is obviously not what was intended.

No one noticed because of
* page-cache at work,
* local RAIDs

Impact:
Failed local READs are not retried remotely,
but errored to upper layers, causing filesystems
to remount read-only, or worse.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

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drbd: Make sure we do not send state updates during an empty resync [Bugz 271]

This is a race condition that existed for ages.
The previous commit reduces the window, this one closes it.

drbd: Make sure we do not send state updates during an empty resync [Bugz 271]

This is a race condition that existed for ages.
The previous commit reduces the window, this one closes it.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

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drbd: Reduce the time an empty resync takes usually

This mitigates changes introduced with commit:
http://git.drbd.org/?p=drbd-8.3.git;a=commit;h=4b6803a3276652da3737

Signed-off

drbd: Reduce the time an empty resync takes usually

This mitigates changes introduced with commit:
http://git.drbd.org/?p=drbd-8.3.git;a=commit;h=4b6803a3276652da3737

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

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fix unit of rs_same_csums accounting

Depending on resync request size,
we need to account for more than one bit.

Impact: cosmetic

If SyncTarget reported correctly 100%

fix unit of rs_same_csums accounting

Depending on resync request size,
we need to account for more than one bit.

Impact: cosmetic

If SyncTarget reported correctly 100% equal checksums,
the SyncSource usually reported 12% equal checksums instead,
because it only counted requests, we typically do 32k resync requests,
and the bitmap granularity is still 4k.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

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drbd: remove unused #include <linux/version.h>

Remove unused #include <linux/version.h>('s) in
drivers/block/drbd/drbd_main.c
drivers/block/drbd/drbd_receiver.c
drivers/blo

drbd: remove unused #include <linux/version.h>

Remove unused #include <linux/version.h>('s) in
drivers/block/drbd/drbd_main.c
drivers/block/drbd/drbd_receiver.c
drivers/block/drbd/drbd_worker.c

Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>

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drbd: remove duplicated #include

Remove duplicated #include('s) in
drivers/block/drbd/drbd_worker.c

Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: Phili

drbd: remove duplicated #include

Remove duplicated #include('s) in
drivers/block/drbd/drbd_worker.c

Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>

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drbd: remove tracing bits

They should be reimplemented in the current scheme.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

dropping unneeded include autoconf.h

It is force-included on the gcc command line since at least 2.6.15.
Explicit include lines seem to break compilation now in certain configurations.

dropping unneeded include autoconf.h

It is force-included on the gcc command line since at least 2.6.15.
Explicit include lines seem to break compilation now in certain configurations.

Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>

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The DRBD driver

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>