Commit 230b55fa authored by NeilBrown's avatar NeilBrown Committed by Shaohua Li

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

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.
 - 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.

Cc: (4.10+)
Signed-off-by: default avatarNeilBrown <>
Tested-by: default avatarJoshua Kinard <>
Acked-by: default avatarJoshua Kinard <>
Signed-off-by: default avatarShaohua Li <>
parent 235b6003
......@@ -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",
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)
if (has_journal) {
if (has_journal || mddev->bitmap) {
return -EBUSY;
......@@ -7159,6 +7159,13 @@ 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",
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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