I want to explain a bit what is the problem this patch solves.
Without it, I always obtain a transfer rate below 9MB/s when writing to a cifs share using splice syscall independently of the buffer size used. However, when reading from the cifs share, I obtain around 105 MB/s.
After applying the patch, the transfer rate I obtain writing to the cifs share depending on the buffer size is:
blocksize (kB)| transfer rate (MB/s)
--------------+----------------------
64 | 51.52
128 | 65.41
256 | 76.64
512 | 85.72
1024 | 90.21
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