Commit a6793684 authored by NeilBrown's avatar NeilBrown Committed by Greg Kroah-Hartman

md: forbid a RAID5 from having both a bitmap and a journal.

commit 230b55fa8d64007339319539f8f8e68114d08529 upstream.

Having both a bitmap and a journal is pointless.
Attempting to do so can corrupt the bitmap if the journal
replay happens before the bitmap is initialized.
Rather than try to avoid this corruption, simply
refuse to allow arrays with both a bitmap and a journal.
So:
 - if raid5_run sees both are present, fail.
 - if adding a bitmap finds a journal is present, fail
 - if adding a journal finds a bitmap is present, fail.
Signed-off-by: 's avatarNeilBrown <neilb@suse.com>
Tested-by: 's avatarJoshua Kinard <kumba@gentoo.org>
Acked-by: 's avatarJoshua Kinard <kumba@gentoo.org>
Signed-off-by: 's avatarShaohua Li <shli@fb.com>
Signed-off-by: 's avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 635526b8
......@@ -1816,6 +1816,12 @@ struct bitmap *bitmap_create(struct mddev *mddev, int slot)
BUG_ON(file && mddev->bitmap_info.offset);
if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
pr_notice("md/raid:%s: array with journal cannot have bitmap\n",
mdname(mddev));
return ERR_PTR(-EBUSY);
}
bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL);
if (!bitmap)
return ERR_PTR(-ENOMEM);
......
......@@ -6362,7 +6362,7 @@ static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
break;
}
}
if (has_journal) {
if (has_journal || mddev->bitmap) {
export_rdev(rdev);
return -EBUSY;
}
......
......@@ -7156,6 +7156,13 @@ static int raid5_run(struct mddev *mddev)
min_offset_diff = diff;
}
if ((test_bit(MD_HAS_JOURNAL, &mddev->flags) || journal_dev) &&
(mddev->bitmap_info.offset || mddev->bitmap_info.file)) {
pr_notice("md/raid:%s: array cannot have both journal and bitmap\n",
mdname(mddev));
return -EINVAL;
}
if (mddev->reshape_position != MaxSector) {
/* Check that we can continue the reshape.
* Difficulties arise if the stripe we would write to
......
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