From: Christoph Hellwig <hch@lst.de>
Date: Wed, 18 Mar 2020 09:12:06 +0100
Subject: [PATCH] block: fix a device invalidation regression
Git-commit: d981cb5b9fa0da9da6a6c8b9ae7cbe789c3b3214
Patch-mainline: v5.7-rc1
References: bsc#1175995,jsc#SLE-15608
Historically we only set the capacity to zero for devices that support
partitions (independ of actually having partitions created). Doing that
is rather inconsistent, but changing it broke legacy udisks polling for
legacy ide-cdrom devices. Use the crude a crude check for devices that
either are non-removable or partitionable to get the sane behavior for
most device while not breaking userspace for this particular setup.
Fixes: a1548b674403 ("block: move rescan_partitions to fs/block_dev.c")
Reported-by: He Zhe <zhe.he@windriver.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: He Zhe <zhe.he@windriver.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Hannes Reinecke <hare@suse.com>
---
fs/block_dev.c | 20 ++++++++++++++++----
1 file changed, 16 insertions(+), 4 deletions(-)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 69bf2fb6f7cd..9501880dff5e 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1520,10 +1520,22 @@ int bdev_disk_changed(struct block_device *bdev, bool invalidate)
if (ret)
return ret;
- if (invalidate)
- set_capacity(disk, 0);
- else if (disk->fops->revalidate_disk)
- disk->fops->revalidate_disk(disk);
+ /*
+ * Historically we only set the capacity to zero for devices that
+ * support partitions (independ of actually having partitions created).
+ * Doing that is rather inconsistent, but changing it broke legacy
+ * udisks polling for legacy ide-cdrom devices. Use the crude check
+ * below to get the sane behavior for most device while not breaking
+ * userspace for this particular setup.
+ */
+ if (invalidate) {
+ if (disk_part_scan_enabled(disk) ||
+ !(disk->flags & GENHD_FL_REMOVABLE))
+ set_capacity(disk, 0);
+ } else {
+ if (disk->fops->revalidate_disk)
+ disk->fops->revalidate_disk(disk);
+ }
check_disk_size_change(disk, bdev, !invalidate);
--
2.16.4