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* Merge branch 'for-2.6.37/drivers' of git://git.kernel.dk/linux-2.6-blockLinus Torvalds2010-10-221-184/+409
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'for-2.6.37/drivers' of git://git.kernel.dk/linux-2.6-block: (95 commits) cciss: fix PCI IDs for new Smart Array controllers drbd: add race-breaker to drbd_go_diskless drbd: use dynamic_dev_dbg to optionally log uuid changes dynamic_debug.h: Fix dynamic_dev_dbg() macro if CONFIG_DYNAMIC_DEBUG not set drbd: cleanup: change "<= 0" to "== 0" drbd: relax the grace period of the md_sync timer again drbd: add some more explicit drbd_md_sync drbd: drop wrong debug asserts, fix recently introduced race drbd: cleanup useless leftover warn/error printk's drbd: add explicit drbd_md_sync to drbd_resync_finished drbd: Do not log an ASSERT for P_OV_REQUEST packets while C_CONNECTED drbd: fix for possible deadlock on IO error during resync drbd: fix unlikely access after free and list corruption drbd: fix for spurious fullsync (uuids rotated too fast) drbd: allow for explicit resync-finished notifications drbd: preparation commit, using full state in receive_state() drbd: drbd_send_ack_dp must not rely on header information drbd: Fix regression in recv_bm_rle_bits (compressed bitmap) drbd: Fixed a stupid copy and paste error drbd: Allow larger values for c-fill-target. ... Fix up trivial conflict in drivers/block/ataflop.c due to BKL removal
| * drbd: add race-breaker to drbd_go_disklessLars Ellenberg2010-10-151-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * drbd: use dynamic_dev_dbg to optionally log uuid changesLars Ellenberg2010-10-151-1/+31
| | | | | | | | | | Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: relax the grace period of the md_sync timer againLars Ellenberg2010-10-141-2/+2
| | | | | | | | | | | | | | | | | | | | | | Consolidate the ifdef's for the debug level, accidentally the used both DEBUG and DRBD_DEBUG_MD_SYNC. Default to off. For production, we can safely reduce the grace period for this timer again the the value we used to have. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: drop wrong debug asserts, fix recently introduced raceLars Ellenberg2010-10-141-9/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | commit 2372c38caadeaebc68a5ee190782c2a0df01edc3 drbd: fix for possible deadlock on IO error during resync introduced a new ASSERT, which turns out to be wrong. Drop it. Also serialize the state change to D_DISKLESS with the after state change work of the -> D_FAILED transition, don't open a new race. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: fix for possible deadlock on IO error during resyncLars Ellenberg2010-10-141-21/+47
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Scenario: Something (say, flush-147:0) is in drbd_al_begin_io, holding a local_cnt, waiting for the resync to make progress. Disk fails, worker in after_state_ch does drbd_rs_cancel_all, then waits for local_cnt to drop to zero. flush-147:0 is woken by drbd_rs_cancel_all, needs to write an AL transaction, and queues that on the worker. Deadlock. Fix: do not wait in the worker, have put_ldev() trigger the state change D_FAILED -> D_DISKLESS when necessary. put_ldev() cannot do the state change directly, as it may or may not already hold various spinlocks. We queue a short work instead. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: fix for spurious fullsync (uuids rotated too fast)Lars Ellenberg2010-10-141-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If it was an "empty" resync, the SyncSource may have already "finished" the resync and rotated the UUIDs, before noticing the connection loss (and generating a new uuid, if Primary, rotating again), while the SyncTarget did not change its uuids at all, or only got to the previous sync-uuid. This would then again lead to a full sync on next handshake (see also Bug #251). Fix: Use explicit resync finished notification even for empty resyncs, do not finish an empty resync implicitly on the SyncSource. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: drbd_send_ack_dp must not rely on header informationLars Ellenberg2010-10-141-5/+6
| | | | | | | | | | | | | | | | | | | | | | drbd commit 17c854fea474a5eb3cfa12e4fb019e46debbc4ec drbd: receiving of big packets, for payloads between 64kByte and 4GByte introduced a new on-the-wire packet header format. We must no longer assume either format, but use the result of whatever drbd_recv_header has decoded. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: fix possible access after freeLars Ellenberg2010-10-141-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If we release the page pointed to by md_io_tmpp, we need to zero out the pointer, too, as that may be used later to decide whether we need to allocate a new page again. Impact: a previously freed page may be used and clobbered. Depending on what that particular page is being used for meanwhile, this may result in silent data corruption of completely unrelated things. Only of concern on devices with logical_block_size != 512 byte, if you re-attach after becoming diskless once. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: Track the reasons to suspend IO in dedicated state bitsPhilipp Reisner2010-10-141-13/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * drbd: fix for spurious full sync (becoming sync target looked like invalidate)Lars Ellenberg2010-10-141-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If a synctarget lost connection while being WFSyncUUID, due to "state sanitizing", the attempted state change to SyncTarget looked like an "invalidate" to after_state_ch() later, thus caused a full sync on next handshake (Bug #318). drbd0: PingAck did not arrive in time. drbd0: peer( Primary -> Unknown ) conn( WFSyncUUID -> NetworkFailure ) pdsk( UpToDate -> DUnknown ) from : { cs:NetworkFailure ro:Secondary/Unknown ds:UpToDate/DUnknown r--- } to : { cs:SyncTarget ro:Secondary/Unknown ds:Inconsistent/DUnknown r--- } after sanizising, resulted in state: { cs:NetworkFailure ro:Secondary/Unknown ds:Inconsistent/DUnknown r--- } drbd0: disk( UpToDate -> Inconsistent ) Fix: don't mask state transition errors in "sanitizing", so the requested state change to SyncTarget fails, instead of being implicitly "remaped" to invalidate. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: cosmetic, don't report resync for online-verifyLars Ellenberg2010-10-141-5/+7
| | | | | | | | | | Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: don't count sendpage()d pages only referenced by tcp as in useLars Ellenberg2010-10-141-0/+1
| | | | | | | | | | Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: Adding support for BIO/Request flags: REQ_FUA, REQ_FLUSH and REQ_DISCARDPhilipp Reisner2010-10-141-14/+14
| | | | | | | | | | Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: fix race on meta-data update, addendumLars Ellenberg2010-10-141-5/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | addendum to baa33ae4eaa4477b60af7c434c0ddd1d182c1ae7 The race: drbd_md_sync() if (!test_and_clear_bit(MD_DIRTY, &mdev->flags)) return; ==> RACE with drbd_md_mark_dirty() rearming the timer. del_timer(&mdev->md_sync_timer); Fixed by moving the del_timer before the test_and_clear_bit. Additionally only rearm the timer in drbd_md_mark_dirty, if MD_DIRTY was not already set, reduce the grace period from five to one second, and add an ifdef'ed debuging aid to find code paths missing an explicit drbd_md_sync, if any, as those are the only relevant ones for this race. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: Removed a race that could cause unexpected execution of ↵Philipp Reisner2010-10-141-16/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | w_make_resync_request() The actual race happened int the drbd_start_resync() function. Where drbd_resync_finished() -> __drbd_set_state() set STOP_SYNC_TIMER and armed the timer. If the timer fired before execution reaches the mod_timer statement at the end of drbd_start_resync() the latter would cause an unexpected call to w_make_resync_request(). Removed the STOP_SYNC_TIMER bit, and base it on the connection state. The STOP_SYNC_TIMER bit probably originates probably the time before the state engine. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: fix race on meta-data updateLars Ellenberg2010-10-141-4/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The race: drbd_md_mark_dirty() drbd_md_sync() if (!test_and_clear_bit(MD_DIRTY, &mdev->flags)) return; drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE) ==> RACE clear_bit(MD_DIRTY, &mdev->flags); <== spurious Fixed by removing the spurious clear_bit. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: Disable activity log updates when the whole device is out of syncPhilipp Reisner2010-10-141-0/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When the complete device is marked as out of sync, we can disable updates of the on disk AL. Currently AL updates are only disabled if one uses the "invalidate-remote" command on an unconnected, primary device, or when at attach time all bits in the bitmap are set. As of now, AL updated do not get disabled when a all bits becomes set due to application writes to an unconnected DRBD device. While this is a missing feature, it is not considered important, and might get added later. BTW, after initializing a "one legged" DRBD device drbdadm create-md resX drbdadm -- --force primary resX AL updates also get disabled, until the first connect. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: Actually allow BIOs up to 128k (was 32k).Philipp Reisner2010-10-141-2/+2
| | | | | | | | | | | | | | | | Now we have multiple BIOs per ee, packets with a 32 bit length field, it gets time to use these goodies. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: Sending of big packets, for payloads from 64KByte to 4GBytePhilipp Reisner2010-10-141-33/+46
| | | | | | | | | | Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: new configuration parameter c-min-rateLars Ellenberg2010-10-141-1/+6
| | | | | | | | | | | | | | | | | | | | | | We now track the data rate of locally submitted resync related requests, and can thus detect non-resync activity on the lower level device. If the current sync rate is above c-min-rate, and the lower level device appears to be busy, we throttle the resyncer. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: use rolling marks for resync speed calculationLars Ellenberg2010-10-141-9/+20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The current resync speed as displayed in /proc/drbd fluctuates a lot. Using an array of rolling marks makes this calculation much more stable. We used to have this (a long time ago with 0.7), but it got lost somehow. If "stalled", do not discard the rest of the information, just add a " (stalled)" tag to the progress line. This patch also shortens a spinlock critical section somewhat, and reduces the number of atomic operations in put_ldev. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: The new, smarter resync speed controllerPhilipp Reisner2010-10-141-0/+1
| | | | | | | | | | Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: New sync_param packet, that includes the parameters of the new controllerPhilipp Reisner2010-10-141-3/+8
| | | | | | | | | | Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: New sync parameters for the smart resync rate controllerPhilipp Reisner2010-10-141-1/+5
| | | | | | | | | | Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: Initialize all members of sync_conf to their defaults [Bugz 315]Philipp Reisner2010-10-141-1/+2
| | | | | | | | | | Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: Make sure tl_restart(, resend) can not get called multiple times for a ↵Philipp Reisner2010-10-141-16/+15
| | | | | | | | | | | | | | new connection Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: Do not try to free tl_hash in drbd_disconnect() when IO is suspendedPhilipp Reisner2010-10-141-0/+4
| | | | | | | | | | | | | | | | | | | | We may not free tl_hash when IO is suspended, since we can not wait until ap_bio_cnt reaches zero. We can do this after susp reched 0, since then tl_clear was called Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: Fixed a deadlock, probably only affected UP machinesPhilipp Reisner2010-10-141-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | After disconnect (most likely mdev->net_cnt == 0) and we are still in an unstable state (!drbd_state_is_stable()). When we get an IO request in drbd_get_max_buffers() (called from __inc_ap_bio_cond(), called from inc_ap_bio()) we wake up misc_wait. Misc_wait is also used in inc_ap_bio() to sleep until the outcome of __inc_ap_bio_cond() changes. => Busy loop! Solution: Have a dedicated wait queue for get_net_conf() and put_net_conf(). Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: Delayed creation of current-UUIDPhilipp Reisner2010-10-141-6/+21
| | | | | | | | | | | | | | | | | | | | | | | | When a fencing policy of "resource-and-stonith" is configured, and DRBD looses connection to it's peer, we can delay the creation of a new current-UUID until IO gets thawed. That allows one to deploy fence-peer handlers that actually commit suicide on the machine they get started. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: Reduce the verbosity of some state transitionsPhilipp Reisner2010-10-141-7/+1
| | | | | | | | | | | | | | | | | | State transitions in the space of non-allowed states used to be very noisy. Reduce that, since that has little value for the majority of the user base. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: Removing a by now obsolete clause in the state sanitizingPhilipp Reisner2010-10-141-3/+0
| | | | | | | | | | Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: Now we need to handle the ed_uuid of an diskless, unconnected primary ↵Philipp Reisner2010-10-141-1/+3
| | | | | | | | | | | | | | correctly Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: Finished the "on-no-data-accessible suspend-io;" functionalityPhilipp Reisner2010-10-141-1/+25
| | | | | | | | | | | | | | | | | | 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>
| * drbd: Do not send two barriers without any writes between themPhilipp Reisner2010-10-141-2/+7
| | | | | | | | | | Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: factored tl_restart() out of tl_clear().Philipp Reisner2010-10-141-37/+79
| | | | | | | | | | | | | | | | If IO was frozen for a temporal network outage, resend the content of the transfer-log into the newly established connection. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: Track all IO requests on the TL, not writes onlyPhilipp Reisner2010-10-141-0/+2
| | | | | | | | | | | | | | With that the drbd_fail_pending_reads() function becomes obsolete. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| * drbd: renamed drbd_tl_epoch.n_req to drbd_tl_epoch.n_writesPhilipp Reisner2010-10-141-6/+6
| | | | | | | | | | Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
* | block: autoconvert trivial BKL users to private mutexArnd Bergmann2010-10-051-5/+6
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The block device drivers have all gained new lock_kernel calls from a recent pushdown, and some of the drivers were already using the BKL before. This turns the BKL into a set of per-driver mutexes. Still need to check whether this is safe to do. file=$1 name=$2 if grep -q lock_kernel ${file} ; then if grep -q 'include.*linux.mutex.h' ${file} ; then sed -i '/include.*<linux\/smp_lock.h>/d' ${file} else sed -i 's/include.*<linux\/smp_lock.h>.*$/include <linux\/mutex.h>/g' ${file} fi sed -i ${file} \ -e "/^#include.*linux.mutex.h/,$ { 1,/^\(static\|int\|long\)/ { /^\(static\|int\|long\)/istatic DEFINE_MUTEX(${name}_mutex); } }" \ -e "s/\(un\)*lock_kernel\>[ ]*()/mutex_\1lock(\&${name}_mutex)/g" \ -e '/[ ]*cycle_kernel_lock();/d' else sed -i -e '/include.*\<smp_lock.h\>/d' ${file} \ -e '/cycle_kernel_lock()/d' fi Signed-off-by: Arnd Bergmann <arnd@arndb.de>
* drbd: revert "delay probes", feature is being re-implemented differentlyLars Ellenberg2010-08-071-75/+0
| | | | | | | | | | | | | | | | 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>
* drbd: Initialize all members of sync_conf to their defaults [Bugz 315]Philipp Reisner2010-08-071-3/+18
| | | | | | | Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Cc: stable@kernel.org Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* drbd: Disable delay probes for the upcomming releasePhilipp Reisner2010-08-071-5/+1
| | | | | | | Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Cc: stable@kernel.org Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* block: push down BKL into .open and .releaseArnd Bergmann2010-08-071-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | The open and release block_device_operations are currently called with the BKL held. In order to change that, we must first make sure that all drivers that currently rely on this have no regressions. This blindly pushes the BKL into all .open and .release operations for all block drivers to prepare for the next step. The drivers can subsequently replace the BKL with their own locks or remove it completely when it can be shown that it is not needed. The functions blkdev_get and blkdev_put are the only remaining users of the big kernel lock in the block layer, besides a few uses in the ioctl code, none of which need to serialize with blkdev_{get,put}. Most of these two functions is also under the protection of bdev->bd_mutex, including the actual calls to ->open and ->release, and the common code does not access any global data structures that need the BKL. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* block: unify flags for struct bio and struct requestChristoph Hellwig2010-08-071-3/+3
| | | | | | | | | | | | | | Remove the current bio flags and reuse the request flags for the bio, too. This allows to more easily trace the type of I/O from the filesystem down to the block driver. There were two flags in the bio that were missing in the requests: BIO_RW_UNPLUG and BIO_RW_AHEAD. Also I've renamed two request flags that had a superflous RW in them. Note that the flags are in bio.h despite having the REQ_ name - as blkdev.h includes bio.h that is the only way to go for now. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* drbd: Fixed a race between disk-attach and unexpected state changesPhilipp Reisner2010-06-141-2/+0
| | | | | | | | | | | | | 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>
* drbd: use drbd specific ratelimit instead of global printk_ratelimitLars Ellenberg2010-06-011-1/+1
| | | | | | | | using the global printk_ratelimit() may mask other messages. 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>
* drbd: improve usage of MSG_MORELars Ellenberg2010-06-011-13/+19
| | | | | | | | | | | | It seems to improve performance if we allow the "p_data" header in its own frame (no MSG_MORE), but sendpage all but the last page with MSG_MORE. This is also in preparation of a later zero copy receive implementation. Suggested by Eduard.Guzovsky@stratus.com on drbd-dev. 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>
* drbd: Revert "drbd: Create new current UUID as late as possible"Philipp Reisner2010-06-011-28/+6
| | | | | | | | The late-UUID writing is delayed until the next release. 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>
* drbd: Do not free p_uuid early, this is done in the exit code of the receiverPhilipp Reisner2010-05-211-2/+0
| | | | | | 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>
* drbd: Ensure to not trigger late-new-UUID creation multiple timesPhilipp Reisner2010-05-211-7/+11
| | | | | | 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>
generated by cgit v1.1 at 2025-08-15 01:40:19 +0000