This is a note to let you know that I've just added the patch titled
dm cache metadata: do not allow the data block size to change
to the 3.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dm-cache-metadata-do-not-allow-the-data-block-size-to-change.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 048e5a07f282c57815b3901d4a68a77fa131ce0a Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@xxxxxxxxxx>
Date: Mon, 14 Jul 2014 16:59:39 -0400
Subject: dm cache metadata: do not allow the data block size to change
From: Mike Snitzer <snitzer@xxxxxxxxxx>
commit 048e5a07f282c57815b3901d4a68a77fa131ce0a upstream.
The block size for the dm-cache's data device must remained fixed for
the life of the cache. Disallow any attempt to change the cache's data
block size.
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Acked-by: Joe Thornber <ejt@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/dm-cache-metadata.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/drivers/md/dm-cache-metadata.c
+++ b/drivers/md/dm-cache-metadata.c
@@ -425,6 +425,15 @@ static int __open_metadata(struct dm_cac
disk_super = dm_block_data(sblock);
+ /* Verify the data block size hasn't changed */
+ if (le32_to_cpu(disk_super->data_block_size) != cmd->data_block_size) {
+ DMERR("changing the data block size (from %u to %llu) is not supported",
+ le32_to_cpu(disk_super->data_block_size),
+ (unsigned long long)cmd->data_block_size);
+ r = -EINVAL;
+ goto bad;
+ }
+
r = __check_incompat_features(disk_super, cmd);
if (r < 0)
goto bad;
Patches currently in stable-queue which might be from snitzer@xxxxxxxxxx are
queue-3.15/dm-thin-metadata-do-not-allow-the-data-block-size-to-change.patch
queue-3.15/dm-cache-metadata-do-not-allow-the-data-block-size-to-change.patch
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