From 7543ae2269a855683a39af57048035f44bc8ef9c Mon Sep 17 00:00:00 2001 From: Wouter Verhelst Date: Thu, 25 Jul 2024 18:45:36 +0200 Subject: nbd: add support for rotational devices The NBD protocol defines the flag NBD_FLAG_ROTATIONAL to flag that the export in use should be treated as a rotational device. Add support for that flag to the kernel driver. Signed-off-by: Wouter Verhelst Reviewed-by: Eric Blake Link: https://lore.kernel.org/r/20240725164536.1275851-1-w@uter.be Signed-off-by: Jens Axboe --- include/uapi/linux/nbd.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'include/uapi') diff --git a/include/uapi/linux/nbd.h b/include/uapi/linux/nbd.h index 80ce0ef43afd..d75215f2c675 100644 --- a/include/uapi/linux/nbd.h +++ b/include/uapi/linux/nbd.h @@ -51,8 +51,9 @@ enum { #define NBD_FLAG_READ_ONLY (1 << 1) /* device is read-only */ #define NBD_FLAG_SEND_FLUSH (1 << 2) /* can flush writeback cache */ #define NBD_FLAG_SEND_FUA (1 << 3) /* send FUA (forced unit access) */ -/* there is a gap here to match userspace */ +#define NBD_FLAG_ROTATIONAL (1 << 4) /* device is rotational */ #define NBD_FLAG_SEND_TRIM (1 << 5) /* send trim/discard */ +/* there is a gap here to match userspace */ #define NBD_FLAG_CAN_MULTI_CONN (1 << 8) /* Server supports multiple connections per export. */ /* values for cmd flags in the upper 16 bits of request type */ -- cgit v1.2.3 From e49dacc71ec2621ce4c422cd5605d4d06f7807b0 Mon Sep 17 00:00:00 2001 From: Wouter Verhelst Date: Mon, 12 Aug 2024 15:20:37 +0200 Subject: nbd: implement the WRITE_ZEROES command The NBD protocol defines a message for zeroing out a region of an export Add support to the kernel driver for that message. Signed-off-by: Wouter Verhelst Cc: Eric Blake Reviewed-by: Damien Le Moal Link: https://lore.kernel.org/r/20240812133032.115134-3-w@uter.be Signed-off-by: Jens Axboe --- include/uapi/linux/nbd.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'include/uapi') diff --git a/include/uapi/linux/nbd.h b/include/uapi/linux/nbd.h index d75215f2c675..f1d468acfb25 100644 --- a/include/uapi/linux/nbd.h +++ b/include/uapi/linux/nbd.h @@ -42,8 +42,9 @@ enum { NBD_CMD_WRITE = 1, NBD_CMD_DISC = 2, NBD_CMD_FLUSH = 3, - NBD_CMD_TRIM = 4 + NBD_CMD_TRIM = 4, /* userspace defines additional extension commands */ + NBD_CMD_WRITE_ZEROES = 6, }; /* values for flags field, these are server interaction specific. */ @@ -53,11 +54,13 @@ enum { #define NBD_FLAG_SEND_FUA (1 << 3) /* send FUA (forced unit access) */ #define NBD_FLAG_ROTATIONAL (1 << 4) /* device is rotational */ #define NBD_FLAG_SEND_TRIM (1 << 5) /* send trim/discard */ +#define NBD_FLAG_SEND_WRITE_ZEROES (1 << 6) /* supports WRITE_ZEROES */ /* there is a gap here to match userspace */ #define NBD_FLAG_CAN_MULTI_CONN (1 << 8) /* Server supports multiple connections per export. */ /* values for cmd flags in the upper 16 bits of request type */ #define NBD_CMD_FLAG_FUA (1 << 16) /* FUA (forced unit access) op */ +#define NBD_CMD_FLAG_NO_HOLE (1 << 17) /* Do not punch a hole for WRITE_ZEROES */ /* These are client behavior specific flags. */ #define NBD_CFLAG_DESTROY_ON_DISCONNECT (1 << 0) /* delete the nbd device on -- cgit v1.2.3