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Using workqueues frees us from having to manage the lifecycle
of three dedicated threads. Discovery (alt server checks) and
sending keepalive packets is now done using work on the
power efficient system queue. Sending and receiving happens
via dedicated work queues with higher priority.
blk-mq has also been around for quite a while in the kernel,
so switching to it doesn't hurt backwards compatibility.
As the code is now refactored to work more as blk-mq is designed,
backwards compatibility even improved while at the same time
freeing us from an arsenal of macros that were required to make
the blk-mq port look and feel like the old implementation.
For example, the code now compiles on CentOS 7 with kernel 3.10
without requiring special macros to detect the heavily modified
RedHat kernel with all its backported features.
A few other design limitations have been rectified along the way,
e.g. switching to another server now doesn't internally disconnect
from the current one first, which theoretically could lead to a
non-working setup, if the new server isn't reachable and then -
because of some transient network error - switching back also
fails. As the discover-thread was torn down from the disconnect
call, the connection would also not repair itself eventually.
we now establish the new connection in parallel to the old one,
and only if that succeeds do we replace the old one with it,
similar to how the automatic alt-server switch already does it.
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Remove superflous, reduntant or otherwise useless
information. Use space as separator instead of comma
for better readability and easier parsing in shell etc.
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Convert dnbd3_host_t to struct sockaddr immediately when
adding alt servers, so we don't have to convert it every time
we establish a connection. Additionally we can now use %pISpc
in printf-like functions instead of having if/else constructs
whenever we want to print an address.
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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This patch removes outdated kernel compatibility macros (used for Linux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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AF_INET luckily was "2" on all platforms checked, so no problems
there with interoperation, but AF_INET6 is different between
Linux, BSD, Windows and possibly others, so map back and forth
between AF_INET/AF_INET6 and HOST_IP4/HOST_IP6 to fix this.
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compare and some unused params)
Also allow newline at end of alt-servers file without complaining about it
not being a valid alt server definition.
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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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[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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[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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