dm-era doesn't support changing the data block size of existing devices,
so check explicitly that the requested block size for a new target
matches the one stored in the metadata.
Fixes: eec40579d84873 ("dm: add era target")
Cc: stable@xxxxxxxxxxxxxxx # v3.15+
Signed-off-by: Nikos Tsironis <ntsironis@xxxxxxxxxxx>
---
drivers/md/dm-era-target.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-era-target.c b/drivers/md/dm-era-target.c
index b24e3839bb3a..52e3f63335d3 100644
--- a/drivers/md/dm-era-target.c
+++ b/drivers/md/dm-era-target.c
@@ -564,6 +564,15 @@ static int open_metadata(struct era_metadata *md)
}
disk = dm_block_data(sblock);
+
+ /* Verify the data block size hasn't changed */
+ if (le32_to_cpu(disk->data_block_size) != md->block_size) {
+ DMERR("changing the data block size (from %u to %llu) is not supported",
+ le32_to_cpu(disk->data_block_size), md->block_size);
+ r = -EINVAL;
+ goto bad;
+ }
+
r = dm_tm_open_with_sm(md->bm, SUPERBLOCK_LOCATION,
disk->metadata_space_map_root,
sizeof(disk->metadata_space_map_root),
@@ -575,7 +584,6 @@ static int open_metadata(struct era_metadata *md)
setup_infos(md);
- md->block_size = le32_to_cpu(disk->data_block_size);
md->nr_blocks = le32_to_cpu(disk->nr_blocks);
md->current_era = le32_to_cpu(disk->current_era);
--
2.11.0
--
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