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nbd: add support for rotational devices

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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 <w@uter.be>
Reviewed-by: Eric Blake <eblake@redhat.com>
Link: https://lore.kernel.org/r/20240725164536.1275851-1-w@uter.be
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Wouter Verhelst 2024-07-25 18:45:36 +02:00 committed by Jens Axboe
parent 7960af373a
commit 7543ae2269
2 changed files with 5 additions and 1 deletions
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3
drivers/block/nbd.c
View File

@ -350,6 +350,9 @@ static int __nbd_set_size(struct nbd_device *nbd, loff_t bytesize,
lim.features |= BLK_FEAT_WRITE_CACHE;
lim.features &= ~BLK_FEAT_FUA;
}
if (nbd->config->flags & NBD_FLAG_ROTATIONAL)
lim.features |= BLK_FEAT_ROTATIONAL;
lim.logical_block_size = blksize;
lim.physical_block_size = blksize;
error = queue_limits_commit_update(nbd->disk->queue, &lim);

3
include/uapi/linux/nbd.h
View File

@ -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 */