linux-kernel - Re: PROBLEM: BLKPG_DEL_PARTITION with GENHD_FL_NO_PART used to return ENXIO, now returns EINVAL

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Message-ID: <ZaZesiKpbMEiiTrf@infradead.org>
Date: Tue, 16 Jan 2024 02:47:14 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Allison Karlitskaya <allison.karlitskaya@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
	Jens Axboe <axboe@...nel.dk>
Subject: Re: PROBLEM: BLKPG_DEL_PARTITION with GENHD_FL_NO_PART used to
 return ENXIO, now returns EINVAL

Hi Allison,

please try this minimal fix.  I need to double check if we historically
returned ENXIO or EINVAL for adding / resizing partitions, which would
make things more complicated.  Or maybe you already have data for that
at hand?

diff --git a/block/ioctl.c b/block/ioctl.c
index 9c73a763ef8838..f2028e39767821 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -21,7 +21,7 @@ static int blkpg_do_ioctl(struct block_device *bdev,
 	sector_t start, length;
 
 	if (disk->flags & GENHD_FL_NO_PART)
-		return -EINVAL;
+		return -ENXIO;
 	if (!capable(CAP_SYS_ADMIN))
 		return -EACCES;
 	if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))