kernel/drivers/md/dm-thin-metadata.h, branch 0x221E-v0.0.1-v6.19

dm: add missing SPDX-License-Indentifiers

2023-02-14T19:23:06Z

'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 thin metadata: remove unused dm_thin_remove_block and __remove

2022-02-22T18:55:50Z

Signed-off-by: Zhiqiang Liu Signed-off-by: Mike Snitzer

dm thin metadata: Add support for a pre-commit callback

2019-12-05T22:05:24Z

Add support for one pre-commit callback which is run right before the metadata are committed. This allows the thin provisioning target to run a callback before the metadata are committed and is required by the next commit. Cc: stable@vger.kernel.org Signed-off-by: Nikos Tsironis Acked-by: Joe Thornber Signed-off-by: Mike Snitzer

dm thin: fix passdown_double_checking_shared_status()

2019-01-15T21:10:41Z

Commit 00a0ea33b495 ("dm thin: do not queue freed thin mapping for next stage processing") changed process_prepared_discard_passdown_pt1() to increment all the blocks being discarded until after the passdown had completed to avoid them being prematurely reused. IO issued to a thin device that breaks sharing with a snapshot, followed by a discard issued to snapshot(s) that previously shared the block(s), results in passdown_double_checking_shared_status() being called to iterate through the blocks double checking their reference count is zero and issuing the passdown if so. So a side effect of commit 00a0ea33b495 is passdown_double_checking_shared_status() was broken. Fix this by checking if the block reference count is greater than 1. Also, rename dm_pool_block_is_used() to dm_pool_block_is_shared(). Fixes: 00a0ea33b495 ("dm thin: do not queue freed thin mapping for next stage processing") Cc: stable@vger.kernel.org # 4.9+ Reported-by: ryan.p.norwood@gmail.com Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer

dm thin: fix a race condition between discarding and provisioning a block

2016-07-20T16:43:35Z

The discard passdown was being issued after the block was unmapped, which meant the block could be reprovisioned whilst the passdown discard was still in flight. We can only identify unshared blocks (safe to do a passdown a discard to) once they're unmapped and their ref count hits zero. Block ref counts are now used to guard against concurrent allocation of these blocks that are being discarded. So now we unmap the block, issue passdown discards, and the immediately increment ref counts for regions that have been discarded via passed down (this is safe because allocation occurs within the same thread). We then decrement ref counts once the passdown discard IO is complete -- signaling these blocks may now be allocated. This fixes the potential for corruption that was reported here: https://www.redhat.com/archives/dm-devel/2016-June/msg00311.html Reported-by: Dennis Yang Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer

dm thin metadata: add dm_thin_remove_range()

2015-06-11T21:13:04Z

Removes a range of blocks from the btree. Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer

dm thin metadata: add dm_thin_find_mapped_range()

2015-06-11T21:13:03Z

Retrieve the next run of contiguously mapped blocks. Useful for working out where to break up IO. Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer

dm thin metadata: remove unused dm_pool_get_data_block_size()

2015-02-09T18:06:49Z

The thin-pool target doesn't display the data block size as part of its table status, unlike the dm-cache target, so there is no need for dm_pool_get_data_block_size(). This was found using cppcheck. Signed-off-by: Rickard Strandqvist Signed-off-by: Mike Snitzer

dm thin: prefetch missing metadata pages

2014-11-10T20:25:27Z

Prefetch metadata at the start of the worker thread and then again every 128th bio processed from the deferred list. Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer

dm thin metadata: change dm_thin_find_block to allow blocking, but not issuing, IO

2014-11-10T20:25:26Z

This change is a prerequisite for allowing metadata to be prefetched. Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer