linux-kernel - [PATCH 5.19 125/192] block: dont add partitions if GD_SUPPRESS_PART

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Date:   Tue, 13 Sep 2022 16:03:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ming Lei <ming.lei@...hat.com>,
        Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 125/192] block: dont add partitions if GD_SUPPRESS_PART_SCAN is set

From: Ming Lei <ming.lei@...hat.com>

[ Upstream commit 748008e1da926a814cc0a054c81ca614408b1b0c ]

Commit b9684a71fca7 ("block, loop: support partitions without scanning")
adds GD_SUPPRESS_PART_SCAN for replacing part function of
GENHD_FL_NO_PART. But looks blk_add_partitions() is missed, since
loop doesn't want to add partitions if GENHD_FL_NO_PART was set.
And it causes regression on libblockdev (as called from udisks) which
operates with the LO_FLAGS_PARTSCAN.

Fixes the issue by not adding partitions if GD_SUPPRESS_PART_SCAN is
set.

Fixes: b9684a71fca7 ("block, loop: support partitions without scanning")
Signed-off-by: Ming Lei <ming.lei@...hat.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Link: https://lore.kernel.org/r/20220823103819.395776-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 block/partitions/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/block/partitions/core.c b/block/partitions/core.c
index 8a0ec929023bc..76617b1d2d47f 100644
--- a/block/partitions/core.c
+++ b/block/partitions/core.c
@@ -597,6 +597,9 @@ static int blk_add_partitions(struct gendisk *disk)
 	if (disk->flags & GENHD_FL_NO_PART)
 		return 0;
 
+	if (test_bit(GD_SUPPRESS_PART_SCAN, &disk->state))
+		return 0;
+
 	state = check_partition(disk);
 	if (!state)
 		return 0;
-- 
2.35.1