From: Sami Tolvanen <samitolvanen@google.com>
Date: Wed, 18 Mar 2015 15:52:14 +0000 (+0000)
Subject: dm verity: add error handling modes for corrupted blocks
X-Git-Tag: omap-for-v4.2/o2_dc~96^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=65ff5b7ddf0541f2b6e5cc59c47bfbf6cbcd91b8;p=pandora-kernel.git

dm verity: add error handling modes for corrupted blocks

Add device specific modes to dm-verity to specify how corrupted
blocks should be handled.  The following modes are defined:

  - DM_VERITY_MODE_EIO is the default behavior, where reading a
    corrupted block results in -EIO.

  - DM_VERITY_MODE_LOGGING only logs corrupted blocks, but does
    not block the read.

  - DM_VERITY_MODE_RESTART calls kernel_restart when a corrupted
    block is discovered.

In addition, each mode sends a uevent to notify userspace of
corruption and to allow further recovery actions.

The driver defaults to previous behavior (DM_VERITY_MODE_EIO)
and other modes can be enabled with an additional parameter to
the verity table.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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