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path: root/drivers/block/drbd
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2011-10-14drbd: Improve how conflicting writes are handledAndreas Gruenbacher
The previous algorithm for dealing with overlapping concurrent writes was generating unnecessary warnings for scenarios which could be legitimate, and did not always handle partially overlapping requests correctly. Improve it algorithm as follows: * While local or remote write requests are in progress, conflicting new local write requests will be delayed (commit 82172f7). * When a conflict between a local and remote write request is detected, the node with the discard flag decides how to resolve the conflict: It will ask its peer to discard conflicting requests which are fully contained in the local request and retry requests which overlap only partially. This involves a protocol change. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Use ping-timeout when waiting for missing ack packetsAndreas Gruenbacher
When the node with the discard flag resolves write conflicts in dual-primary mode, it may determine that its peer has sent ack packets on the metadata socket which did not arrive, yet. Wait for the next ack with ping-timeout instead of a hard-coded 30 seconds. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Replace atomic_add_return with atomic_inc_returnAndreas Gruenbacher
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Concurrent write detection fixAndreas Gruenbacher
Commit 9b1e63e changed the concurrent write detection algorithm to only insert peer requests into write_requests tree after determining that there is no conflict. With this change, new conflicting local requests could be added while the algorithm runs, but this case was not handled correctly. Instead of making the algorithm deal with this case, switch back to adding peer requests to the write_requests tree immediately: this improves fairness. When a peer request is discarded, remove that request from the write_requests Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Use container_of() instead of castingAndreas Gruenbacher
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: fix a wrong likely(), updated commentsLars Ellenberg
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: silence some log messages on bitmap IOLars Ellenberg
Summary log messages meant for global bitmap IO should not be printed for bitmap IO caused by activity log transactions. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: new on-disk activity log transaction formatLars Ellenberg
Use a new on-disk transaction format for the activity log, which allows for multiple changes to the active set per transaction. Using 4k transaction blocks, we can now get rid of the work-around code to deal with devices not supporting 512 byte logical block size. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14lru_cache: allow multiple changes per transactionLars Ellenberg
Allow multiple changes to the active set of elements in lru_cache. The only current user of lru_cache, drbd, is driving this generalisation. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: allow to select specific bitmap pages for writeoutLars Ellenberg
We are about to allow several changes to the active set in one activity log transaction. We have to write out the corresponding bitmap pages as well, if changed. Introduce drbd_bm_mark_for_writeout(), then re-use the existing bitmap writeout path to submit all marked pages in one go. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: use clear_bit_unlock() where appropriateLars Ellenberg
Some open-coded clear_bit(); smp_mb__after_clear_bit(); should in fact have been smp_mb__before_clear_bit(); clear_bit(); Instead, use clear_bit_unlock() to annotate the intention, and have it do the right thing. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: in drbd_suspend_al, set AL_SUSPENDED before unlocking the activity logLars Ellenberg
As using an empty activity log is the whole point of the excercise, make sure it is still empty when setting AL_SUSPENDED. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: fix typo in commentLars Ellenberg
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: simplify condition in drbd_may_do_local_read()Lars Ellenberg
fold if (x >= (N+1)) return 0; if (x < N) return 0; into if (x != N) return 0; Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Use the IS_ALIGNED() macro in some more placesAndreas Gruenbacher
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Remove obsolete commentAndreas Gruenbacher
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Iterate over all overlapping intervals in a treeAndreas Gruenbacher
Add a macro and helper function for doing that. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Rename drbd_endio_{pri,sec} -> drbd_{,peer_}request_endioAndreas Gruenbacher
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Rename drbd_submit_ee -> drbd_submit_peer_requestAndreas Gruenbacher
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Implemented connection wide state changesPhilipp Reisner
That is used for graceful disconnect only Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: implemented receiving of P_CONN_ST_CHG_REQPhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Implemented receiving of P_CONN_ST_CHG_REPLYPhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Global_state_lock not necessary here...Philipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Implemented conn_send_state_req()Philipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Introduced tconn->cstate_mutexPhilipp Reisner
In compatibility mode with old DRBDs, use that as the state_mutex as well. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Removed drbd_state_lock() and drbd_state_unlock()Philipp Reisner
The lock they constructed is only taken when the state_mutex was already taken. It is superficial. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Killed volume0; last step of multi-volume-enablementPhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Code de-duplication; new function apply_mask_val()Philipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Removed the os parameter form sanitize_state()Philipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Extracted is_valid_conn_transition() out of is_valid_transition()Philipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Extracted is_valid_transition() out of sanitize_state()Philipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Renamed is_valid_state_transition() to is_valid_soft_transition()Philipp Reisner
And removed the unused mdev parameter, and made the order of the state parameters: os, ns Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Extracted after_conn_state_ch() out of after_state_ch()Philipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Converted drbd_send_ping() and related functions from mdev to tconnPhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Generalized the work callbacksPhilipp Reisner
No longer work callbacks must operate on a mdev. From now on they can also operate on a tconn. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Moved some initializing code into drbd_new_tconn()Philipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: drbd_thread has now a pointer to a tconn instead of to a mdevPhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Converted drbd_worker() from mdev to tconnPhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Converted drbd_asender() from mdev to tconnPhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Converted drbdd_init() from mdev to tconnPhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Consolidated the setup of the thread name into the frameworkPhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Moved the mdev member into drbd_work (from drbd_request and ↵Philipp Reisner
drbd_peer_request) Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Converted drbd_free_sock() and drbd_disconnect() from mdev to tconnPhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Converted drbdd() from mdev to tconnPhilipp Reisner
The drbd_md_sync(mdev) happens in the after state change anyways... Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Converted drbd_calc_cpu_mask() and drbd_thread_current_set_cpu() from ↵Philipp Reisner
mdev to tconn Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Converted drbd_connect() from mdev to tconnPhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Use and idr data structure to map volume numbers to mdev pointersPhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Converted drbd_send_protocol() from mdev to tconnPhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Converted drbd_do_auth() from mdev to tconnPhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-09-28drbd: Converted drbd_(get|put)_data_sock() and drbd_send_cmd2() to tconnPhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
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