linux-dev/Documentation/admin-guide/device-mapper, branch master

dm verity: Add documentation for try_verify_in_tasklet option

2022-10-18T21:17:48Z

Add documentation that was missing from commit 5721d4e5a9cd ("dm verity: Add optional "try_verify_in_tasklet" feature"). Signed-off-by: Milan Broz Signed-off-by: Mike Snitzer

dm writecache: count number of blocks discarded, not number of discard bios

2022-07-14T19:54:46Z

Change dm-writecache, so that it counts the number of blocks discarded instead of the number of discard bios. Make it consistent with the read and write statistics counters that were changed to count the number of blocks instead of bios. Fixes: e3a35d03407c ("dm writecache: add event counters") Signed-off-by: Mikulas Patocka Signed-off-by: Mike Snitzer

dm writecache: count number of blocks written, not number of write bios

2022-07-14T19:53:25Z

Change dm-writecache, so that it counts the number of blocks written instead of the number of write bios. Bios can be split and requeued using the dm_accept_partial_bio function, so counting bios caused inaccurate results. Fixes: e3a35d03407c ("dm writecache: add event counters") Reported-by: Yu Kuai Signed-off-by: Mikulas Patocka Signed-off-by: Mike Snitzer

dm writecache: count number of blocks read, not number of read bios

2022-07-14T19:52:32Z

Change dm-writecache, so that it counts the number of blocks read instead of the number of read bios. Bios can be split and requeued using the dm_accept_partial_bio function, so counting bios caused inaccurate results. Fixes: e3a35d03407c ("dm writecache: add event counters") Reported-by: Yu Kuai Signed-off-by: Mikulas Patocka Signed-off-by: Mike Snitzer

Documentation: dm writecache: Render status list as list

2022-07-07T18:40:32Z

The status list isn't rendered as list, but rather as normal paragraph, because there is missing blank line between "Status:" line and the list. Fix the issue by adding the blank line separator. Fixes: 48debafe4f2fea ("dm: add writecache target") Signed-off-by: Bagas Sanjaya Signed-off-by: Mike Snitzer

Documentation: dm writecache: add blank line before optional parameters

2022-07-07T18:37:58Z

Otherwise this warning occurs: Documentation/admin-guide/device-mapper/writecache.rst:23: WARNING: Unexpected indentation. Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Mike Snitzer

dm ima: update dm documentation for ima measurement support

2021-08-20T20:07:37Z

The ima documentation for measuring DM targets (dm-ima.rst) is missing the attribute information for the targets - 'cache', 'integrity', 'multipath', and 'snapshot'. It is also missing the grammar for various DM events and targets, which can help the attestation servers to determine what data to expect for a given DM device. Further, the documentation needs to be updated to incorporate code changes made to DM ima events and targets as part of this patch series. For instance, prefixing the event names with "dm_", adding the DM version to events, prefixing the table hashes in the ima log with the hash algorithm etc. There are warnings reported by 'make htmldocs' on dm-ima.rst, which need to be fixed. And lastly, the expected behavior needs to be documented when the configuration CONFIG_IMA_DISABLE_HTABLE is disabled. Update the documentation to add examples for 'cache', 'integrity', 'multipath', and 'snapshot' targets. Add the grammar for various DM events and targets in Backus Naur form, so that the attestation servers can interpret and act on the ima measurements for DM target. Fix htmldocs warnings in dm-ima.rst. Update the documentation to be consistent with the code changes that are part of this patch series. Reported-by: Stephen Rothwell Signed-off-by: Tushar Sugandhi Signed-off-by: Mike Snitzer

dm: add documentation for IMA measurement support

2021-08-10T17:34:23Z

To interpret various DM target measurement data in IMA logs, a separate documentation page is needed under Documentation/admin-guide/device-mapper. Add documentation to help system administrators and attestation client/server component owners to interpret the measurement data generated by various DM targets, on various device/table state changes. Signed-off-by: Tushar Sugandhi Signed-off-by: Mike Snitzer

dm writecache: add event counters

2021-08-10T17:27:49Z

Add 10 counters for various events (hit, miss, etc) and export them in the status line (accessed from userspace with "dmsetup status"). Also add a message "clear_stats" that resets these counters. Signed-off-by: Mikulas Patocka Signed-off-by: Mike Snitzer

dm writecache: make writeback pause configurable

2021-06-28T20:30:13Z

Commit 95b88f4d71cb953e02206be3c757083601391a0f ("dm writecache: pause writeback if cache full and origin being written directly") introduced a code that pauses cache flushing if we are issuing writes directly to the origin. Improve that initial commit by making the timeout code configurable (via the option "pause_writeback"). Also change the default from 1s to 3s because it performed better. Signed-off-by: Mikulas Patocka Signed-off-by: Mike Snitzer