- 10 Mar, 2011 40 commits
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Lars Ellenberg authored
In case we ever should add an other packet type, we must not reuse 27, as that currently used for "empty" return code only replies. Document it as such. Signed-off-by:
Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by:
Lars Ellenberg <lars.ellenberg@linbit.com>
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Lars Ellenberg authored
Make sure we start with clean buffers to not accidentally send garbage back to userspace. Note: has not been observed; but just in case. Signed-off-by:
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Lars Ellenberg authored
There still exists a (theoretical) race on module unload, where /proc/drbd may still exist, but the netlink callback has been unregistered already, allowing drbdsetup to shout without listeners, and get no reply. Reorder remove_proc_entry and unregister of netlink callback. drbdsetup first checks for existence of the proc entry, and if that is missing, won't even try to contact the module. Signed-off-by:
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Lars Ellenberg authored
If someone holds /proc/drbd open, previously rmmod would "succeed" in starting the unload, but then block on remove_proc_entry, leading to a situation where the lsmod does not show drbd anymore, but /proc/drbd being still there (but no longer accessible). I'd rather have rmmod fail up front in this case. Signed-off-by:
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Philipp Reisner authored
Given low-enough network bandwidth combined with a IO pattern that hammers onto a single RS-extent, side-stepping might be necessary for much longer times. Changed the code to print a single informal message after 20 seconds, but it keeps on stepping aside forever. Signed-off-by:
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Philipp Reisner authored
This patch is acutally a necessary addendum to the patch "fix for spurious full sync (becoming sync target looked like invalidate)" Signed-off-by:
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Philipp Reisner authored
* C_STARTING_SYNC_S, C_STARTING_SYNC_T In these states the bitmap gets written to disk. Locking out of app-IO is done by using the drbd_queue_bitmap_io() and drbd_bitmap_io() functions these days. It is no longer necessary to lock out app-IO based on the connection state. App-IO that may come in after the BITMAP_IO flag got cleared before the state transition to C_SYNC_(SOURCE|TARGET) does not get mirrored, sets a bit in the local bitmap, that is already set, therefore changes nothing. * C_WF_BITMAP_S In this state we send updates (P_OUT_OF_SYNC packets). With that we make sure they have the same number of bits when going into the C_SYNC_(SOURCE|TARGET) connection state. * C_UNCONNECTED: The receiver starts, no need to lock out IO. * C_DISCONNECTING: in drbd_disconnect() we had a wait_event() to wait until ap_bio_cnt reaches 0. Removed that. * C_TIMEOUT, C_BROKEN_PIPE, C_NETWORK_FAILURE C_PROTOCOL_ERROR, C_TEAR_DOWN: Same as C_DISCONNECTING * C_WF_REPORT_PARAMS: IO still possible since that is still like C_WF_CONNECTION. And we do not need to send barriers in C_WF_BITMAP_S connection state. Allow concurrent accesses to the bitmap when receiving the bitmap. Everything gets ORed anyways. A drbd_free_tl_hash() is in after_state_chg_work(). At that point all the work items of the last connections must have been processed. Introduced a call to drbd_free_tl_hash() into drbd_free_mdev() for paranoia reasons. Signed-off-by:
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Philipp Reisner authored
The relevant change is that the state change to C_FW_BITMAP_S should implicitly change pdsk to C_CONSISTENT. (Think of it as C_OUTDATED, only without the guarantee that the peer has the outdated written to its meta data) At that opportunity I restructured the switch statement so that it gets evaluated every time. (Has declarative character) Signed-off-by:
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Philipp Reisner authored
May only test for ap_bio_cnt == 0 under req_lock. It can increase only under req_lock. Signed-off-by:
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Philipp Reisner authored
The condition must be checked after perpare_to_wait(). The old implementaion could loose wakeup events. Never observed in real life. Signed-off-by:
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Philipp Reisner authored
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Philipp Reisner authored
Since inc_ap_bio() might sleep already Signed-off-by:
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Philipp Reisner authored
Before: drbd_rs_begin_io() locked app-IO out of an RS extent, and waited then until all previous app-IO in that area finished. (But not only until the disk-IO was finished but until the barrier/epoch ack came in for that == round trip time latency ++) After: As soon as a new app-IO waits wants to start new IO on that RS extent, drbd_rs_begin_io() steps aside (clearing the BME_NO_WRITES flag again). It retries after 100ms. Signed-off-by:
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Philipp Reisner authored
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Philipp Reisner authored
We only issue resync requests if there is no significant application IO going on. = Application IO has higher priority than resnyc IO. If application IO can not be started because the resync process locked an resync_lru entry, start the IO operations necessary to release the lock ASAP. Signed-off-by:
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Philipp Reisner authored
This one should be replaced with moving this cleanup to the 'right' position. Signed-off-by:
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Philipp Reisner authored
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Philipp Reisner authored
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Philipp Reisner authored
In this connection mode, the ahead node no longer replicates application IO. The behind's disk becomes out dated. Signed-off-by:
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Philipp Reisner authored
net { on_congestion {block|pull-ahead|disconnect}; congestion-fill {sectors}; congestion-extents {al-extents}; } Signed-off-by: -
Philipp Reisner authored
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Lars Ellenberg authored
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Lars Ellenberg authored
With commit drbd: further converge progress display of resync and online-verify accidentally an u64/u64 div was introduced, causing an unresolvable symbol __udivdi3 to be reference. Actually for that division, 32bit are still suficient for now, so we can revert to unsigned long instead. Signed-off-by:
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Lars Ellenberg authored
To ease tracking of bios in some hash tables, we want it to not cross certain boundaries (128k, used to be 32k). We limit the maximum bio size using queue parameters. Historically some defines and variables we use there have been named max_segment_size, which was misguided. Rename them to max_bio_size, and use [blk_]queue_max_hw_sectors where appropriate. Signed-off-by:
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Lars Ellenberg authored
We used to be limited to 32k requests, but have increased that limit to 128k now. This part of the code can only deal with 32k, it would scramble arbitrary pages for larger requests. As it is used for debugging only anyways, it is ok to simply truncate the dumped data here. Signed-off-by:
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Lars Ellenberg authored
With data-integrity digest enabled, double-check on the sending side for modifications by upper layers of buffers under write back, so we can tell it appart from corruption on the "wire". Signed-off-by:
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Lars Ellenberg authored
Show progressbar and ETA always, with proc_details >= 1 also show the current sector position for both resync and online-verify on both nodes. Signed-off-by:
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Lars Ellenberg authored
When converting bits (4k resolution, still) to kB, we shift left. If it was a large number of bits on a 32bit box (>= 4 TiB storage), we may wrap the 32bit unsigned long base type, resulting in incorrect display. Signed-off-by:
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Lars Ellenberg authored
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Lars Ellenberg authored
Preparation patch to be able to use the auto-throttling resync controller for online-verify requests as well. Signed-off-by:
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Lars Ellenberg authored
Preparation patch to be able to use the auto-throttling resync controller for online-verify requests as well. Signed-off-by:
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Lars Ellenberg authored
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Lars Ellenberg authored
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Lars Ellenberg authored
This is in preparation to unify progress reporting of online-verify and resync requests. Signed-off-by:
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Lars Ellenberg authored
For partial (resumed) online verify, initialize the resync step marks once we know what the online verify start sector is. Signed-off-by:
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Lars Ellenberg authored
For a partial (resumed) online-verify, initialize rs_total not to total bits, but to number of bits to check in this run, to match the meaning rs_total has for actual resync. Signed-off-by:
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Lars Ellenberg authored
For network hickups during online-verify, on the next verify triggered, we by default want to resume where it left off. After any replication link interruption, there will be a (possibly empty) resync. Do not reset online-verify start sector if some resync completed, that would defeats the purpose. Only reset the start sector once a verify run is completed. Signed-off-by:
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Jens Axboe authored
Conflicts: block/blk-core.c block/blk-flush.c drivers/md/raid1.c drivers/md/raid10.c drivers/md/raid5.c fs/nilfs2/btnode.c fs/nilfs2/mdt.c Signed-off-by:Jens Axboe <jaxboe@fusionio.com>
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Vivek Goyal authored
Use plug in throttle dispatch also as we are dispatching a bunch of bios in throttle context and some of them might merge. Signed-off-by:
Vivek Goyal <vgoyal@redhat.com> Signed-off-by:
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Jens Axboe authored
With the plugging now being explicitly controlled by the submitter, callers need not pass down unplugging hints to the block layer. If they want to unplug, it's because they manually plugged on their own - in which case, they should just unplug at will. Signed-off-by:
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