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dm integrity: support larger block sizes

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The DM integrity block size can now be 512, 1k, 2k or 4k.  Using larger
blocks reduces metadata handling overhead.  The block size can be
configured at table load time using the "block_size:<value>" option;
where <value> is expressed in bytes (defult is still 512 bytes).

It is safe to use larger block sizes with DM integrity, because the
DM integrity journal makes sure that the whole block is updated
atomically even if the underlying device doesn't support atomic writes
of that size (e.g. 4k block ontop of a 512b device).

Depends-on: 2859323e ("block: fix blk_integrity_register to use template's interval_exp if not 0")
Signed-off-by: Mikulas Patocka <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
This commit is contained in:
Mikulas Patocka 2017-04-18 16:51:52 -04:00 • committed by Mike Snitzer
commit 9d609f85b7
2 changed files with 179 additions and 45 deletions
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5
Documentation/device-mapper/dm-integrity.txt
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@ -136,6 +136,11 @@ journal_mac:algorithm(:key) (the key is optional)
the journal. Thus, modified sector number would be detected at
this stage.
block_size:number
The size of a data block in bytes. The larger the block size the
less overhead there is for per-block integrity metadata.
Supported values are 512, 1024, 2048 and 4096 bytes. If not
specified the default block size is 512 bytes.
The journal mode (D/J), buffer_sectors, journal_watermark, commit_time can
be changed when reloading the target (load an inactive table and swap the