Re: [Qemu-devel] [PATCH v3 42/44] nbd: Implement NBD_CMD_WRITE_ZEROES on client

On 23 Apr 2016, at 00:40, Eric Blake wrote: > Upstream NBD protocol recently added the ability to efficiently > write zeroes without having to send the zeroes over the wire, > along with a flag to control whether the client wants a hole. > > The generic block code takes care

[Qemu-devel] [PATCH v3 42/44] nbd: Implement NBD_CMD_WRITE_ZEROES on client

Upstream NBD protocol recently added the ability to efficiently write zeroes without having to send the zeroes over the wire, along with a flag to control whether the client wants a hole. The generic block code takes care of falling back to the obvious write of lots of zeroes if we return