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2012-11-04drbd: allow holes in minor and volume id allocationLars Ellenberg3-20/+22
s/idr_get_new/idr_get_new_above/ Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2012-11-04drbd: switch configuration interface from connector to genetlinkLars Ellenberg7-840/+806
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: prepare the transition from connector to genetlinkLars Ellenberg4-0/+1081
This adds the new API header and helper files. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: get rid of drbd_bcast_ee, it is of no use anymoreLars Ellenberg1-2/+0
This function was used to broadcast the (leading part of the) bio payload in case we see a data integrity error. It could be received from userland with the drbdsetup events subcommand, to have a peek into the payload that caused the checksum mismatch, and guess from there what may have caused the mismatch, mainly to guess wether it was modification of in-flight data, or data corruption by broken hardware or software bugs. Meanwhile we support bios that are larger than the maximum payload a netlink datagram can carry. And we have means to reliably detect modification of in-flight data by calculating, and comparing, the checksum before and after sendmsg. There is no need to carry this around anymore. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: fix drbd_delete_device: remove vnr from volumes; idr_remove(); synchronize_rcu(); before cleanupLars Ellenberg1-18/+24
Still missing: rcu_readlock() on the various call sites that access/iterate over those idrs. We don't need a specific write lock, as we only modify from configuration context, which is already strictly serialized. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: introduce a bio_set to allocate housekeeping bios fromLars Ellenberg5-4/+41
Don't rely on availability of bios from the global fs_bio_set, we should use our own bio_set for meta data IO. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: use the newly introduced page pool for bitmap IOLars Ellenberg1-5/+4
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: add page pool to be used for meta data IOLars Ellenberg2-1/+31
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: only wakeup if something changed in update_peer_seqLars Ellenberg1-4/+5
This commit got it wrong: drbd: Make the peer_seq updating code more obvious Make it more clear that update_peer_seq() is supposed to wake up the seq_wait queue whenever the sequence number changes. We don't need to wake up everytime we receive a sequence number that is _different_ from our currently stored "newest" sequence number, but only if we receive a sequence number _newer_ than what we already have, when we actually change mdev->peer_seq. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: default to detach on-io-errorLars Ellenberg1-1/+1
Old default behaviour was "pass-on", which is not useful in production at all. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: remove unused defineLars Ellenberg1-2/+0
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Replaced the minor_table array by an idrPhilipp Reisner5-45/+31
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Implemented new commands to create/delete connections/minorsPhilipp Reisner5-73/+120
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Converted drbd_nl_(net_conf|disconnect)() from mdev to tconnPhilipp Reisner3-61/+63
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Preparing the connector interface to operator on connectionsPhilipp Reisner4-37/+94
Up to now it only operated on minor numbers. Now it can work also on named connections. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Converted the transfer log from mdev to tconnPhilipp Reisner7-72/+79
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Improved the dec_*() macrosPhilipp Reisner1-22/+29
Now those can be used with a struct drbd_conf * that has an other name than 'mdev'. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Removed the mdev parameter from the ..to_tags() and ...from_tags() functionsPhilipp Reisner1-19/+19
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Reworked the unconfiguring and thread stopping codePhilipp Reisner6-70/+80
* Moved CONFIG_PENDING and DEVICE_DYING from mdev to tconn. * Renamed drbd_reconfig_start() and drbd_reconfig_done() to conn_reconfig_start() and conn_reconfig_done(). Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Remove left-over function prototypesAndreas Gruenbacher2-3/+0
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Replace get_asender_cmd() with its implementationAndreas Gruenbacher1-38/+28
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Get rid of P_MAX_CMDAndreas Gruenbacher3-9/+5
Instead of artificially enlarging the command decoding arrays to P_MAX_CMD entries, check if an index is within the valid range using the ARRAY_SIZE() macro. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Remove redundant checkAndreas Gruenbacher1-27/+0
Opening a device only succeeds on a primary node, or when explicitly setting the allow_oos module parameter to allow opening the device read-only on a secondary node. There is no other way that a request can get into drbd_make_request(), so this code cannot trigger. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Improve how conflicting writes are handledAndreas Gruenbacher5-191/+351
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 Gruenbacher1-2/+3
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 Gruenbacher2-6/+6
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 Gruenbacher1-20/+21
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 Gruenbacher1-3/+6
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 Ellenberg1-7/+8
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 Ellenberg1-5/+9
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 Ellenberg6-209/+302
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 Ellenberg4-140/+225
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 Ellenberg2-10/+52
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>
2011-10-14lru_cache: consolidate lc_get and lc_try_getLars Ellenberg1-59/+61
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14lru_cache.h: fix comments referring to ts_ instead of lc_Lars Ellenberg1-1/+1
For some time we contemplated calling the "struct lru_cache" a "struct tracked_set", and some comments kept the ts_ prefix. Fix those to match the member field names. 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 Ellenberg4-12/+7
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 Ellenberg1-5/+3
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 Ellenberg1-1/+1
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 Ellenberg1-3/+1
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 Gruenbacher3-5/+5
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2011-10-14drbd: Remove obsolete commentAndreas Gruenbacher1-2/+1
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 Gruenbacher2-4/+30
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 Gruenbacher6-16/+17
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 Gruenbacher3-9/+11
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 Reisner2-14/+76
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 Reisner4-2/+20
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 Reisner2-8/+22
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 Reisner1-4/+0
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 Reisner3-6/+21
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 Reisner6-17/+26
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>
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