kernel/linux.git/drivers/md/dm-cache-metadata.h, branch v6.19.11

dm cache: Remove unused dm_cache_size

2024-11-20T10:38:04+00:00

dm_cache_size() has been unused since the original commit c6b4fcbad044 ("dm: add cache target") Remove it. Signed-off-by: Dr. David Alan Gilbert Signed-off-by: Mikulas Patocka

dm cache: Remove unused dm_cache_dump

2024-11-20T10:38:04+00:00

dm_cache_dump() has been unused since the original commit c6b4fcbad044 ("dm: add cache target") Remove it. Signed-off-by: Dr. David Alan Gilbert Signed-off-by: Mikulas Patocka

dm: change "unsigned" to "unsigned int"

2023-02-14T19:23:06+00:00

Signed-off-by: Heinz Mauelshagen Signed-off-by: Mike Snitzer

dm: add missing SPDX-License-Indentifiers

2023-02-14T19:23:06+00:00

'GPL-2.0-only' is used instead of 'GPL-2.0' because SPDX has deprecated its use. Suggested-by: John Wiele Signed-off-by: Heinz Mauelshagen Signed-off-by: Mike Snitzer

dm cache: fix typo in 2 comment blocks

2022-07-07T15:49:37+00:00

Replace neccessarily with necessarily. Signed-off-by: Steven Lung <1030steven@gmail.com> Signed-off-by: Mike Snitzer

dm cache: significant rework to leverage dm-bio-prison-v2

2017-03-07T18:28:31+00:00

The cache policy interfaces have been updated to work well with the new bio-prison v2 interface's ability to queue work immediately (promotion, demotion, etc) -- overriding benefit being reduced latency on processing IO through the cache. Previously such work would be left for the DM cache core to queue on various lists and then process in batches later -- this caused a serious delay in latency for IO driven by the cache. The background tracker code was factored out so that all cache policies can make use of it. Also, the "cleaner" policy has been removed and is now a variant of the smq policy that simply disallows migrations. Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer

dm cache metadata: add "metadata2" feature

2017-02-16T18:12:47+00:00

If "metadata2" is provided as a table argument when creating/loading a cache target a more compact metadata format, with separate dirty bits, is used. "metadata2" improves speed of shutting down a cache target. Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer

dm cache: make sure every metadata function checks fail_io

2016-03-10T22:12:12+00:00

Otherwise operations may be attempted that will only ever go on to crash (since the metadata device is either missing or unreliable if 'fail_io' is set). Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer Cc: stable@vger.kernel.org

dm cache: add fail io mode and needs_check flag

2015-06-11T21:13:00+00:00

If a cache metadata operation fails (e.g. transaction commit) the cache's metadata device will abort the current transaction, set a new needs_check flag, and the cache will transition to "read-only" mode. If aborting the transaction or setting the needs_check flag fails the cache will transition to "fail-io" mode. Once needs_check is set the cache device will not be allowed to activate. Activation requires write access to metadata. Future work is needed to add proper support for running the cache in read-only mode. Once in fail-io mode the cache will report a status of "Fail". Also, add commit() wrapper that will disallow commits if in read_only or fail mode. Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer

dm cache: revert "remove remainder of distinct discard block size"

2014-11-10T20:25:30+00:00

This reverts commit 64ab346a360a4b15c28fb8531918d4a01f4eabd9 because we actually do want to allow the discard blocksize to be larger than the cache blocksize. Further dm-cache discard changes will make this possible. Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer