diff options
| author | Sami Tolvanen <samitolvanen@google.com> | 2015-02-26 13:47:41 +0000 |
|---|---|---|
| committer | Mister Oyster <oysterized@gmail.com> | 2017-12-27 18:43:16 +0100 |
| commit | 01318aaca0af3082f99b0eef937d55da783e7b2b (patch) | |
| tree | 6c15d90cdc0426a56bc6195f699324da625fa5e5 /Documentation/device-mapper | |
| parent | a069c6ac6e1b91b0c8ec0587c4ee981b8dcb344c (diff) | |
dm-verity: Add modes and emit uevent on corrupted blocks
Add a device specific mode to dm-verity for handling corrupted
blocks:
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.
Each mode sends a uevent to notify userspace of corruption and
allow further recovery actions.
Defaults to previous behavior, other modes can be enabled with
an optional parameter added to the verity table.
Change-Id: Ib72ae6ccb865594d28f3553bdcc5a40b1d7af390
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Diffstat (limited to 'Documentation/device-mapper')
| -rw-r--r-- | Documentation/device-mapper/verity.txt | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/Documentation/device-mapper/verity.txt b/Documentation/device-mapper/verity.txt index 988468153..2929f6b1c 100644 --- a/Documentation/device-mapper/verity.txt +++ b/Documentation/device-mapper/verity.txt @@ -10,7 +10,7 @@ Construction Parameters <version> <dev> <hash_dev> <data_block_size> <hash_block_size> <num_data_blocks> <hash_start_block> - <algorithm> <digest> <salt> + <algorithm> <digest> <salt> <mode> <version> This is the type of the on-disk hash format. @@ -62,6 +62,16 @@ Construction Parameters <salt> The hexadecimal encoding of the salt value. +<mode> + Optional. The mode of operation. + + 0 is the normal mode of operation where a corrupted block will result in an + I/O error. + + 1 is logging mode where corrupted blocks are logged and a uevent is sent to + notify user space. + + Theory of operation =================== |