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path: root/include/linux/drbd.h
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2010-10-22drbd: Silenced an assertPhilipp Reisner
That assertion's condition needed adjustment for today's semantics Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2010-10-15drbd: add race-breaker to drbd_go_disklessLars Ellenberg
This adds a necessary race breaker to these commits: drbd: fix for possible deadlock on IO error during resync drbd: drop wrong debug asserts, fix recently introduced race What we do is get a refcount, check the state, then depending on the state and the requested minimum disk state, either hold it (success), or give it back immediately (failed "try lock"). Some code paths (flushing of drbd metadata) may still grab and hold a refcount even if we are D_FAILED (application IO won't). So even if we hit local_cnt == 0 once after being D_FAILED, we still need to wait for that again after we changed to D_DISKLESS. Once local_cnt reaches 0 while we are D_DISKLESS, we can be sure that no one will look at the protected members anymore, so only then is it safe to free them. We cannot easily convert to standard locking primitives here, as we want to be able to use it in atomic context (we always do a "try lock"), as well as hold references for a "long time" (from IO submission to completion callback). Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2010-10-14drbd: fix unlikely access after free and list corruptionLars Ellenberg
Various cleanup paths have been incomplete, for the very unlikely case that we cannot allocate enough bios from process context when submitting on behalf of the peer or resync process. Never observed. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2010-10-14drbd: Track the reasons to suspend IO in dedicated state bitsPhilipp Reisner
There are three ways to get IO suspended: * Loss of any access to data * Fence-peer-handler running * User requested to suspend IO Track those in different bits, so that one condition clearing its state bit does not interfere with the other two conditions. Only when the user resumes IO he overrules all three bits. The fact is hidden from the user, he sees only a single suspend bit. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2010-10-14drbd: Sending of big packets, for payloads from 64KByte to 4GBytePhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2010-10-14drbd: Do not allow a fencing-policy of resource-and-stonith with protocol APhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2010-10-14drbd: Finished the "on-no-data-accessible suspend-io;" functionalityPhilipp Reisner
When no data is accessible (no connection to the peer, nor a local disk) allow the user to select to freeze all IO operations instead of getting IO errors. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2010-08-07drbd: revert "delay probes", feature is being re-implemented differentlyLars Ellenberg
It was a now abandoned attempt to throttle resync bandwidth based on the delay it causes on the bulk data socket. It has no userbase yet, and has been disabled by 9173465ccb51c09cc3102a10af93e9f469a0af6f already. This removes the now unused code. The basic feature, namely using up "idle" bandwith of network and disk IO subsystem, with minimal impact to application IO, is being reimplemented differently. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-06-14drbd: Fixed a race between disk-attach and unexpected state changesPhilipp Reisner
This was a very hard to trigger race condition. If we got a state packet from the peer, after drbd_nl_disk() has already changed the disk state to D_NEGOTIATING but after_state_ch() was not yet run by the worker, then receive_state() might called drbd_sync_handshake(), which in turn crashed when accessing p_uuid. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2010-06-01Preparing 8.3.8rc2Philipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-05-21drbd: This is now equivalent to drbd release 8.3.8rc1Philipp Reisner
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>
2010-05-18drbd: Implemented the --assume-clean option for drbdsetup resizePhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2010-03-11drbd: --dry-run option for drbdsetup net ( drbdadm -- --dry-run connect <res> )Philipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2010-01-12drbd: The kernel code is now equivalent to out of tree release 8.3.7Philipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2009-11-25drbd: moved CN_IDX_DRBD and CN_VAL_DRBD to the right filePhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2009-11-24DRBD: Now the code is 8.3.6 + 3 fixes (without compat crap)Philipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2009-11-04Now it is equal to DRBD release 8.3.5 without compat crapPhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2009-10-06drbd: Work on permission enforcementPhilipp Reisner
Now we have the capabilities of the sending process available, use them to enforce CAP_SYS_ADMIN. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-10-01The DRBD driverPhilipp Reisner
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>