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Add metadata superblock and check it on start

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Refuse to start if the superblock is missing or bad version;
zero out the metadata area when initializing superblock.
This commit is contained in:
Vitaliy Filippov
2021-04-10 22:26:17 +03:00
parent f684d9101a
commit 2a02f3c4c7
5 changed files with 152 additions and 27 deletions
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mon/simple-offsets.js
+4 -1
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@@ -51,7 +51,7 @@ async function run()
const meta_offset = options.journal_offset + Math.ceil(options.journal_size/options.device_block_size)*options.device_block_size;
const entries_per_block = Math.floor(options.device_block_size / (24 + 2*options.object_size/options.bitmap_granularity/8));
const object_count = Math.floor((device_size-meta_offset)/options.object_size);
const meta_size = Math.ceil(object_count / entries_per_block) * options.device_block_size;
const meta_size = Math.ceil(1 + object_count / entries_per_block) * options.device_block_size;
const data_offset = meta_offset + meta_size;
const meta_size_fmt = (meta_size > 1024*1024*1024 ? Math.round(meta_size/1024/1024/1024*100)/100+" GB"
: Math.round(meta_size/1024/1024*100)/100+" MB");
@@ -65,6 +65,9 @@ async function run()
);
}
process.stdout.write(
(options.device_block_size != 4096 ?
` --meta_block_size ${options.device}\n`+
` --journal_block-size ${options.device}\n` : '')+
` --data_device ${options.device}\n`+
` --journal_offset ${options.journal_offset}\n`+
` --meta_offset ${meta_offset}\n`+