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This change restructures the source code directories, separates shared
form non-shared application code and adds CMake dependencies. These
dependencies allow the tracking of changes and trigger a rebuild of
those build targets where changed files are involved.
WARNING: Note that the support of the DNBD3_SERVER_AFL build option is
not supported yet. Thus, the option should be never turned on.
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This change converts all debug messages to support the Linux kernel's
dynamic debug feature. Debug messages can be enabled or disabled by
the debug feature if the
- kernel module is built in debug mode (EXTRA_CFLAGS=-g -DDEBUG)
- Linux kernel supports dynamic debug (CONFIG_DYNAMIC_DEBUG is set)
This patch removes outdated kernel compatibility macros (used for Linux
kernels in version 4.x) and cleans up the kernel module's code.
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This converts the dnbd3 kernel module driver to use the blk-mq
infrastructure, which allows the dnbd3 kernel module driver to be
compatible with Linux kernels in version 5.x or later. The conversion of
the implementation uses one hardware queue to preserve the existing
send/receive and load-balancing logic, but can be scaled up in the
future. In addition to that, time measurements in the implementation are
converted to ktime based accessors to replace the use of deprecated time
interfaces.
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- Disable panic timeout that reports errors to block layer by default
- Get rid of "is_server" used by old proxy mode, introduce
"honor_server_alts" that just controls whether we use alts provided by
the server
- Allow switching servers when we only have 3 RTT measurements
- If using alts provided by server, don't ignore those that come from
other servers than the initial one
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Some minor debugging code, mostly commented out
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[KERNEL] Remove server mode support as it's not needed anymore
[KERNEL] Some more sanity checks and debug messages
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Right after connecting, all servers will be polled every 4 seconds for 30 seconds,
so we get 7 data points per alt-server. If no better server is found during
this time, further RTT measurements will be done every 22 seconds, to put
less load on the network in the long run.
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tracked and debugged
Fix compilation of kernel module
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[SERVER] Skeleton of server-to-server communication
[SERVER] Update access-time of images in use by actual clients
[*] Add dnbd3_host_t type to handle address+port+addrtype consistently across the project
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[KERNEL] SysFS: Return empty string for current_server if not connected
[SERVER] Code refactoring
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[KERNEL] Detect dead idle connection earlier
[KERNEL] Improved debug output
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[SERVER] Use MSG_MORE instead of cork/uncork to save two syscalls
[KERNEL] Fail-Counter for alt servers, ignore servers that fail too often
[KERNEL] Add new alt servers to list, instead of replacing the old list
[*] Add CMD_LATEST_RID to tell client about new revisions
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[*] Add CMD_KEEPALIVE protocol message type
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[SERVER] Fix a few off-by-one bugs
[SERVER] Make log available through IPC
[KERNEL] Hot-Swap to faster connection on load-balance
[KERNEL] Report I/O error to block layer if no server replies within a given time frame
[*] Modified network protocol to handle volume names instead of ids
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[KERNEL] Socket swap fixed
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[ALL] Send and receive servers
[TODO] Config file reloading is broken
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[KERNEL] Bugfixes
[CLIENT] Using vid and rid
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[KERNEL] Send keep alive
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[SERVER] Build error/warning on x64 fixed
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