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dm era: Verify the data block size hasn't changed 

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: eec40579d8 ("dm: add era target")
Cc: stable@vger.kernel.org # v3.15+
Signed-off-by: Nikos Tsironis <ntsironis@arrikto.com>
Reviewed-by: Ming-Hung Tsai <mtsai@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Nikos Tsironis 2021-01-22 17:25:53 +02:00 committed by Mike Snitzer
parent 2524933307
commit c8e846ff93
1 changed files with 9 additions and 1 deletions
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10
drivers/md/dm-era-target.c
View File

@ -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);