[PATCHv11 07/10] block: expose write streams for block device nodes

[Nitesh Shetty]

On 05/12/24 05:53PM, Keith Busch wrote:
>From: Christoph Hellwig <hch at lst.de>
>
>Export statx information about the number and granularity of write
>streams, use the per-kiocb write hint and map temperature hints to write
>streams (which is a bit questionable, but this shows how it is done).
>
>Signed-off-by: Christoph Hellwig <hch at lst.de>
>Signed-off-by: Keith Busch <kbusch at kernel.org>
>---
> block/bdev.c |  6 ++++++
> block/fops.c | 23 +++++++++++++++++++++++
> 2 files changed, 29 insertions(+)
>
>diff --git a/block/bdev.c b/block/bdev.c
>index 738e3c8457e7f..c23245f1fdfe3 100644
>--- a/block/bdev.c
>+++ b/block/bdev.c
>@@ -1296,6 +1296,12 @@ void bdev_statx(struct path *path, struct kstat *stat,
> 		stat->result_mask |= STATX_DIOALIGN;
> 	}
>
>+	if ((request_mask & STATX_WRITE_STREAM) &&
Need to remove a check for at the start of the function for this to
work,
something like this,
-	if (!(request_mask & (STATX_DIOALIGN | STATX_WRITE_ATOMIC)))
+	if (!(request_mask & (STATX_DIOALIGN | STATX_WRITE_ATOMIC |
+		STATX_WRITE_STREAM)))
		return;


>+	    bdev_max_write_streams(bdev)) {
>+		stat->write_stream_max = bdev_max_write_streams(bdev);
I think write_stream_granularity needs to be added.
stat->write_stream_granularity = bdev_write_stream_granularity(bdev); 

Otherwise, patch looks good to me.

--Nitesh Shetty