linux/drivers/block/drbd
Lars Ellenberg 35f47ef1a1 drbd: avoid to shrink max_bio_size due to peer re-configuration
For a long time, the receiving side has spread "too large" incoming
requests over multiple bios.  No need to shrink our max_bio_size
(max_hw_sectors) if the peer is reconfigured to use a different storage.

The problem manifests itself if we are not the top of the device stack
(DRBD is used a LVM PV).

A hardware reconfiguration on the peer may cause the supported
max_bio_size to shrink, and the connection handshake would now
unnecessarily shrink the max_bio_size on the active node.

There is no way to notify upper layers that they have to "re-stack"
their limits. So they won't notice at all, and may keep submitting bios
that are suddenly considered "too large for device".

We already check for compatibility and ignore changes on the peer,
the code only was masked out unless we have a fully established connection.
We just need to allow it a bit earlier during the handshake.

Also consider max_hw_sectors in our merge bvec function, just in case.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-11-08 09:10:29 -07:00
..
Kconfig drbd: update Kconfig to match current dependencies 2012-12-06 13:08:29 +01:00
Makefile drbd: Split off netlink mandatory attribute handling into separate file 2012-11-08 16:57:45 +01:00
drbd_actlog.c drbd: Allow online change of al-stripes and al-stripe-size 2013-06-28 16:04:36 +02:00
drbd_bitmap.c treewide: Add __GFP_NOWARN to k.alloc calls with v.alloc fallbacks 2013-08-20 13:06:40 +02:00
drbd_int.h drbd: Fix adding of new minors with freshly created meta data 2013-11-08 09:10:28 -07:00
drbd_interval.c Merge branch 'drbd-8.4_ed6' into for-3.8-drivers-drbd-8.4_ed6 2012-11-09 14:20:23 +01:00
drbd_interval.h drbd: Iterate over all overlapping intervals in a tree 2011-10-14 16:47:37 +02:00
drbd_main.c drbd: fix NULL pointer deref in module init error path 2013-11-08 09:10:28 -07:00
drbd_nl.c drbd: avoid to shrink max_bio_size due to peer re-configuration 2013-11-08 09:10:29 -07:00
drbd_nla.c drbd: Split off netlink mandatory attribute handling into separate file 2012-11-08 16:57:45 +01:00
drbd_nla.h drbd: Split off netlink mandatory attribute handling into separate file 2012-11-08 16:57:45 +01:00
drbd_proc.c Merge branch 'for-3.10/drivers' of git://git.kernel.dk/linux-block 2013-05-08 11:51:05 -07:00
drbd_receiver.c drbd: fix decoding of bitmap vli rle for device sizes > 64 TB 2013-11-08 09:10:28 -07:00
drbd_req.c drbd: avoid to shrink max_bio_size due to peer re-configuration 2013-11-08 09:10:29 -07:00
drbd_req.h drbd: only fail empty flushes if no good data is reachable 2013-03-28 10:10:25 -06:00
drbd_state.c drbd: Ignore the exit code of a fence-peer handler if it returns too late 2013-06-28 16:04:36 +02:00
drbd_state.h drbd: Improved logging of state changes 2012-11-08 16:45:06 +01:00
drbd_strings.c drbd: Fix disconnect to keep the peer disk state if connection breaks during operation 2013-03-28 10:10:25 -06:00
drbd_vli.h Fix common misspellings 2011-03-31 11:26:23 -03:00
drbd_worker.c drbd: validate resync_after dependency on attach already 2013-03-28 10:10:25 -06:00
drbd_wrappers.h drbd: Split off netlink mandatory attribute handling into separate file 2012-11-08 16:57:45 +01:00