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* FAILED: patch "[PATCH] block: flag zoned disks with GENHD_FL_NO_PART" failed to apply to 5.10-stable tree
@ 2026-09-08 13:38 gregkh
  2026-09-10 19:08 ` [PATCH 5.10.y 1/7] block: remove a dead check in show_partition Sasha Levin
  0 siblings, 1 reply; 8+ messages in thread
From: gregkh @ 2026-09-08 13:38 UTC (permalink / raw)
  To: dlemoal, axboe, bvanassche, hare, hare, hch; +Cc: stable


The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 3f9c7a108c0e8f14425384912017071b71341e3b
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026090834-voyage-donut-60bd@gregkh' --subject-prefix 'PATCH 5.10.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 3f9c7a108c0e8f14425384912017071b71341e3b Mon Sep 17 00:00:00 2001
From: Damien Le Moal <dlemoal@kernel.org>
Date: Mon, 31 Aug 2026 11:50:50 +0900
Subject: [PATCH] block: flag zoned disks with GENHD_FL_NO_PART

Zoned block devices do not support partitions. However, the partition
table is nevertheless still inspected, and any partition found ignored
with a warning in add_partition(). While this is generally not a problem,
and in fact beneficial to the user as it indicates an invalid use of a
zoned block device, scanning for a partition table on the device may
result in issuing read operations to offline zones (e.g. after a disk head
is depopulated for disks that support head management operations).

Since partitions are ignored anyway, completely disable partition scanning
for zoned gendisks by setting the flag GENHD_FL_NO_PART in __add_disk().
The existing check in add_partition() is left as-is to ensure that we
still get a warning if for whatever reason, despite GENHD_FL_NO_PART, we
still endup trying to add partitions.

Flagging zoned disks with GENHD_FL_NO_PART also has the benefit to expose
through sysfs the ext_range attribute with the value of 1 instead of the
default DISK_MAX_PARTS, thus correctly advertizing the fact that zoned
disks do not support partitions.

Fixes: 5eac3eb30c9a ("block: Remove partition support for zoned block devices")
Cc: stable@vger.kernel.org
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Hannes Reinecke <hare@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://patch.msgid.link/20260831025050.667758-1-dlemoal@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/genhd.c b/block/genhd.c
index f1990c7cdfb9..10ca8b4d6eea 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -447,6 +447,13 @@ static int __add_disk(struct device *parent, struct gendisk *disk,
 		bdev_set_flag(disk->part0, BD_HAS_SUBMIT_BIO);
 	}
 
+	/*
+	 * We do not support partitions with zoned block devices, so do not try
+	 * to scan the partitions table.
+	 */
+	if (blk_queue_is_zoned(disk->queue))
+		disk->flags |= GENHD_FL_NO_PART;
+
 	/*
 	 * If the driver provides an explicit major number it also must provide
 	 * the number of minors numbers supported, and those will be used to


^ permalink raw reply related	[flat|nested] 8+ messages in thread
end of thread, other threads:[~2026-09-10 19:08 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-09-08 13:38 FAILED: patch "[PATCH] block: flag zoned disks with GENHD_FL_NO_PART" failed to apply to 5.10-stable tree gregkh
2026-09-10 19:08 ` [PATCH 5.10.y 1/7] block: remove a dead check in show_partition Sasha Levin
2026-09-10 19:08   ` [PATCH 5.10.y 2/7] block: rename GENHD_FL_NO_PART_SCAN to GENHD_FL_NO_PART Sasha Levin
2026-09-10 19:08   ` [PATCH 5.10.y 3/7] null_blk: don't suppress partitioning information Sasha Levin
2026-09-10 19:08   ` [PATCH 5.10.y 4/7] mmc: don't set GENHD_FL_SUPPRESS_PARTITION_INFO Sasha Levin
2026-09-10 19:08   ` [PATCH 5.10.y 5/7] block: remove GENHD_FL_SUPPRESS_PARTITION_INFO Sasha Levin
2026-09-10 19:08   ` [PATCH 5.10.y 6/7] block: don't set GENHD_FL_NO_PART for hidden gendisks Sasha Levin
2026-09-10 19:08   ` [PATCH 5.10.y 7/7] block: flag zoned disks with GENHD_FL_NO_PART Sasha Levin

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