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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.
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.

Cc: stable@vger.kernel.org (4.10+)
Signed-off-by: NeilBrown <neilb@suse.com>
Tested-by: Joshua Kinard <kumba@gentoo.org>
Acked-by: Joshua Kinard <kumba@gentoo.org>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
NeilBrown 2017-10-17 14:24:09 +11:00 committed by Shaohua Li
parent 235b6003fb
commit 230b55fa8d
3 changed files with 14 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/md/md-bitmap.c
View File

@ -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);

2
drivers/md/md.c
View File

@ -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;
}

7
drivers/md/raid5.c
View File

@ -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",
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