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* [SERVER] Handle "warn unused result" casesSimon Rettberg2020-03-066-10/+26
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* [SERVER] Reload cache maps periodically for local imagesSimon Rettberg2020-03-063-49/+93
| | | | | | If an image is incomplete, but has no upstream server that can be used for replication, reload the cache map from disk periodically, in case some other server instance is writing to the image.
* [SERVER] Add timer task for saving cache mapsSimon Rettberg2020-03-046-75/+164
| | | | | | | | | Cache maps will now be saved periodically, but only if either they have a "dirty" bit set, which happens if any bits in the map get cleared again (due to corruption), or if new data has been replicated from an uplink server. This either means at least one byte received and 5 minutes have passed, or at least 500MB have been downloaded. The timer currently runs every 20 seconds.
* [SERVER] Likewise, get rid of same loops in client handlerSimon Rettberg2020-03-042-51/+39Star
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* [SERVER] Get rid of two loops in image_updateCacheMapSimon Rettberg2020-03-031-22/+18Star
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* [SERVER] Optimize client handler for CMD_GET_BLOCKSimon Rettberg2020-03-031-25/+43
| | | | | | | | Move CMD_GET_BLOCK out of switch block and mark as likely. Don't acquire and release cache map for every single request, but keep reference around and only release when a message other than CMD_GET_BLOCK arrives. On idle links, this should happen through CMD_KEEPALIVE every now and then.
* [SERVER] Expose image->problem bools as bitmask in RPC json dataSimon Rettberg2020-03-032-4/+13
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* [SERVER] Also add a flag for uplink queue overloadSimon Rettberg2020-03-033-8/+16
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* [SERVER] Remove "working" flag, introduce fine-grained flagsSimon Rettberg2020-03-036-158/+197
| | | | | | | | Tracking the "working" state of images using one boolean is insufficient regarding the different ways in which providing an image can fail. Introduce separate flags for different conditions, like "file not readable", "file not writable", "no uplink server available", "file content has changed".
* [SERVER] altservers: Fix missing index mapping (replication)Simon Rettberg2020-02-261-1/+1
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* [SERVER] Introduce ignoreAllocErrorsSimon Rettberg2020-02-243-2/+16
| | | | | If enabled, a failed fallocate will not abort image replication, but retry with sparse mode.
* [SERVER] Lookup image on storage even in proxy modeSimon Rettberg2020-01-281-8/+11
| | | | | | | In proxy mode, when rid 0 is requested, we now first query our uplink servers for the latest revision and if this fails, like in non-proxy mode, we'll see what the latest version on disk is.
* [SERVER] Fix another nullpointer accessSimon Rettberg2019-10-301-1/+3
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* [SERVER] Fix checking images without cache mapSimon Rettberg2019-10-293-10/+14
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* [*] Fix/simplify checks for linuxSimon Rettberg2019-09-171-2/+2
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* [SERVER] rpc: Fix warningsSimon Rettberg2019-09-111-2/+2
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* [SERVER] Make buffer when reading for crc check largerSimon Rettberg2019-09-111-1/+1
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* [SERVER] Make integrity checks on startup asyncSimon Rettberg2019-09-103-31/+37
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* [SERVER] Fix warning on clangSimon Rettberg2019-09-071-6/+1Star
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* [SERVER] picohttpparser: Merge 81fe3d99fd90a55cafb993e53fd3000dbc4d564cSimon Rettberg2019-09-071-21/+46
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* [SERVER] rpc: Add cachemap featureSimon Rettberg2019-09-064-1/+63
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* [SERVER] Introduce autoFreeDiskSpaceDelaySimon Rettberg2019-09-053-6/+27
| | | | | | | | This setting allows you to control the formerly hard-coded timeout of 10 hours before a proxy would start deleting old images in order to free up space for new images. Setting it to -1 entirely disables automatic deletion, in case you have an external process for freeing up disk space.
* [SERVER] integrity checker: Improve flushing logicSimon Rettberg2019-09-052-90/+111
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* [SERVER] Support limiting alt-servers to specific namespaceSimon Rettberg2019-09-045-18/+49
| | | | | | Not really namespace but simple string matching for the image path. Path is matched from start with no support for glob or regex, so usually you want to have a trailing '/' to limit to certain directories.
* [SERVER] Fix altservers_getListForClient()Simon Rettberg2019-09-043-6/+66
| | | | | The score wasn't reset when adding clients to the list, resulting in exactly one server filling up the whole list.
* [SERVER] Fix indentationSimon Rettberg2019-09-031-4/+4
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* [SERVER] Fix image_updateCachemap()Simon Rettberg2019-09-031-4/+8
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* [SERVER] Move signal init to uplink_initSimon Rettberg2019-09-021-10/+11
| | | | | | | Initializing the signal in the thread lead to a race where we would init the uplink and queue a request for it before the thread actually initialized it. This was not harmful but lead to spurious warnings in the server's log.
* [SERVER] uplink: Don't disable already disabled imageSimon Rettberg2019-09-021-1/+1
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* [SERVER] Fix compiler warningsSimon Rettberg2019-09-022-4/+4
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* [SERVER] uplink: Don't reinit uplink when freeing itSimon Rettberg2019-09-021-13/+3Star
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* [SERVER] Less debug spam, fix RTT interval calculationSimon Rettberg2019-08-301-3/+5
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* [SERVER] Introduce debug spamSimon Rettberg2019-08-301-8/+8
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* [SERVER] No uplink_init when checking working state; improve loggingSimon Rettberg2019-08-302-8/+11
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* [SERVER] Tear down whole uplink on idle timeoutSimon Rettberg2019-08-292-29/+24Star
| | | | | | Keeping the uplink thread around forever even though we disconnected from the upstream server seems wasteful. Get rid of this and rear down the uplink entirely.
* [SERVER] Use weakref for cache mapsSimon Rettberg2019-08-297-160/+220
| | | | | | Gets rid of a bunch of locking, especially the hot path in net.c where clients are requesting data. Many clients unsing the same incomplete image previously created a bottleneck here.
* [SERVER] reference: Fix error msg usageSimon Rettberg2019-08-292-2/+2
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* [SERVER] Speed up shutdown of integrity checkerSimon Rettberg2019-08-281-2/+5
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* [SERVER] Reintroduce check whether readFd is actually != -1Simon Rettberg2019-08-281-1/+3
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* [SERVER] Make signal handling more POSIXSimon Rettberg2019-08-288-33/+74
| | | | | | | | | | | | | | | According to POSIX, a signal sent to a PID can be delivered to an arbitrary thread of that process that hasn't the signal blocked. This seens to never happen on Linux, but would mess things up since the code expected the main signal handler to only be executed by the main thread. This should now be fixed by examining the destination PID of the signal as well as the ID of the thread currently running the signal handler. If we notice the signal wasn't sent by our own PID and the handler is not currently run by the main thread, we re-send the signal to the main thread. Otherwise, if the signal was sent by our own PID but the handler is not run in the main thread, do nothing. This way we can use pthread_kill() to wake up threads that might be stuck in a blocking syscall when it's time to shut down.
* [SERVER] Remove old commentsSimon Rettberg2019-08-282-38/+0Star
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* [SERVER] Handle closeUnusedFd via timerSimon Rettberg2019-08-282-25/+19Star
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* [SERVER] Add timer infrastructureSimon Rettberg2019-08-272-10/+134
| | | | To be used by "close unused fd" checks, and others...
* [SERVER] Fix swapped assignmentSimon Rettberg2019-08-271-1/+1
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* [SERVER] Use reference counting for uplinkSimon Rettberg2019-08-2711-140/+311
| | | | First step towards less locking for proxy mode
* [SERVER] Fix warnings, simplify lockingSimon Rettberg2019-08-262-12/+13
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* [SERVER] Get rid of alt-servers thread, per-uplink rtt historySimon Rettberg2019-08-228-481/+463Star
| | | | | | | | | | Alt-Server checks are now run using the threadpool, so we don't need a queue and dedicated thread anymore. The rtt history is now kept per uplink, so many uplinks won't overwhelm the history, making its time window very short. Also the fail counter is now split up; a global one for when the server actually isn't reachable, a local (per-uplink) one for when the server is reachable but doesn't serve the requested image.
* [SERVER] Put request handle into CMD_ERROR replySimon Rettberg2019-08-221-1/+1
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* [SERVER] Add struct representing active connection to uplink serverSimon Rettberg2019-08-185-66/+60Star
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* [SERVER] uplink: More consistent type/variable namingSimon Rettberg2019-08-185-288/+294
| | | | | * Change link to uplink everywhere * dnbd3_connection_t -> dnbd3_uplink_t
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