Daan De Meyer
d71ece3f0b
Disabling NOCOW when data has been written to a file doesn't work. Instead, when we're done writing to a journal file (after archiving), let's rewrite the file with COW enabled. This also takes care of properly defragmenting the file. With zstd compression level 3, journal files are compressed to 12% of their original size with default journal settings. As rewriting the file might take a while since we also do an fsync() after the rewrite, this work is done in the offline thread to avoid blocking the journald event loop.
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