Implement the WRITE_ZEROES command for the NBD kernel driver. While here, add NBD_FLAG_ROTATIONAL to the function that decodes our flags for debugfs. --- v2: Divide UINT_MAX by blksize for the maximum number of sectors supported by trim/discard and write_zeroes commands, as NBD uses 32-bit values for byte lengths, and otherwise that wouldn't fit. v3: Use the SECTOR_SHIFT value as a right-shift operand, rather than the blksize value, to get the correct operand. v4: Fix commit messages to use correct style. Thanks, Jens. --- drivers/block/nbd.c | 12 +++++++++++- include/uapi/linux/nbd.h | 5 ++++- 2 files changed, 15 insertions(+), 2 deletions(-)
