block: restore /proc/partitions to not display non-partitionable removable devices

We found with newer kernels we started seeing the cdrom device showing
up in /proc/partitions, but it was not there before.

Looking into this I found that commit d27769ec ("block: add
GENHD_FL_NO_PART_SCAN") introduces this change in behavior.  It's not
clear to me from the commit's changelog if this change was intentional or
not.  This comment still remains: /* Don't show non-partitionable
removeable devices or empty devices */ so I've decided to send a patch to
restore the behavior of not printing unpartitionable removable devices.

Signed-off-by: Josh Hunt <johunt@akamai.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/block/genhd.c b/block/genhd.c
index 3993ebf4135fb1adb8e25c9562dadd996d1c6be2..4125bebe1076ce5466caaa344bcea37f22efdabe 100644 (file)
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -847,7 +847,7 @@ static int show_partition(struct seq_file *seqf, void *v)
        char buf[BDEVNAME_SIZE];
 
        /* Don't show non-partitionable removeable devices or empty devices */
-       if (!get_capacity(sgp) || (!disk_max_parts(sgp) &&
+       if (!get_capacity(sgp) || (!(disk_max_parts(sgp) > 1) &&
                                   (sgp->flags & GENHD_FL_REMOVABLE)))
                return 0;
        if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)