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md: check for NULL ->meta_bdev before calling bdev_read_only 

->meta_bdev is optional and not set for most arrays.  Add a
rdev_read_only helper that calls bdev_read_only for both devices
in a safe way.

Fixes: 6f0d9689b6 ("block: remove the NULL bdev check in bdev_read_only")
Reported-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-02-01 14:17:20 +01:00 committed by Jens Axboe
parent f7bf5e24e0
commit d7a4783883
1 changed files with 8 additions and 5 deletions
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13
drivers/md/md.c
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@ -2399,6 +2399,12 @@ int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
}
EXPORT_SYMBOL(md_integrity_add_rdev);
static bool rdev_read_only(struct md_rdev *rdev)
{
return bdev_read_only(rdev->bdev) ||
(rdev->meta_bdev && bdev_read_only(rdev->meta_bdev));
}
static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
{
char b[BDEVNAME_SIZE];
@ -2408,8 +2414,7 @@ static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
if (find_rdev(mddev, rdev->bdev->bd_dev))
return -EEXIST;
if ((bdev_read_only(rdev->bdev) || bdev_read_only(rdev->meta_bdev)) &&
mddev->pers)
if (rdev_read_only(rdev) && mddev->pers)
return -EROFS;
/* make sure rdev->sectors exceeds mddev->dev_sectors */
@ -5843,9 +5848,7 @@ int md_run(struct mddev *mddev)
continue;
sync_blockdev(rdev->bdev);
invalidate_bdev(rdev->bdev);
if (mddev->ro != 1 &&
(bdev_read_only(rdev->bdev) ||
bdev_read_only(rdev->meta_bdev))) {
if (mddev->ro != 1 && rdev_read_only(rdev)) {
mddev->ro = 1;
if (mddev->gendisk)
set_disk_ro(mddev->gendisk, 1);