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- Add support for aborting session and further uploads via SIGQUIT
- Make API versioned
- Change it to "uuid" everywhere instead of a mix of uuid and guid
- Server can now tell us to wait with further uploads
- merge request is now urlencoded POST instead of mime data
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Add a version to the URL, rest can be configured dynamically by -C
as it's a simple prefix.
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Don't allocate a data cluster in data file for empty l2 entries when
resizing the image file.
Calculating l2 offset in metadata file was broken and overlapping l1.
Delete unneeded entries from cow struct.
Rename a few more variables.
Fix a few possible race conditions.
Only upload modified blocks from cluster.
Simplify cow_write() function by handling misaligned start/end first.
Try to also simplify cow_read() a bit.
TODO: Documentation, update the cow merger service.
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- Use the term "cluster" for a group of dnbd3-blocks instead of also
calling them blocks.
- Use term "table" instead of "array" for the L1 and L2 tables.
- Use term "index" instead of "offset" when addressing those tables
- Fix a few logic bugs, use-after-free
- Add TODOs for parts that need better comments
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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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Similar logic already exists in the fuse client:
Count how many times in a row a server was fastest when
measuring RTTs, and lower the switching threshold
more the higher the count gets.
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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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