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2020 Feb 10
2
[nbdkit PATCH 05/10] plugins: Wire up file-based plugin support for NBD_INFO_INIT_STATE
The NBD protocol is adding an extension to let servers advertise initialization state to the client: whether the image contains holes, and whether it is known to read as all zeroes. For file-based plugins, we are already probing lseek(SEEK_HOLE) to learn if extents are supported; a slight tweak to remember if that result is EOF tells us if we are sparse, and a similar lseek(SEEK_DATA) returning