Joe Thornber f046f89a99 dm thin: fix discard corruption ... Fix a bug in dm_btree_remove that could leave leaf values with incorrect reference counts. The effect of this was that removal of a shared block could result in the space maps thinking the block was no longer used. More concretely, if you have a thin device and a snapshot of it, sending a discard to a shared region of the thin could corrupt the snapshot. Thinp uses a 2-level nested btree to store it's mappings. This first level is indexed by thin device, and the second level by logical block. Often when we're removing an entry in this mapping tree we need to rebalance nodes, which can involve shadowing them, possibly creating a copy if the block is shared. If we do create a copy then children of that node need to have their reference counts incremented. In this way reference counts percolate down the tree as shared trees diverge. The rebalance functions were incrementing the children at the appropriate time, but they were always assuming the children were internal nodes. This meant the leaf values (in our case packed block/flags entries) were not being incremented. Cc: stable@vger.kernel.org Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>		2013-03-20 17:21:24 +00:00
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dm-array.c	dm persistent data: add transactional array	2013-03-01 22:45:51 +00:00
dm-array.h	dm persistent data: add transactional array	2013-03-01 22:45:51 +00:00
dm-bitset.c	dm persistent data: add bitset	2013-03-01 22:45:51 +00:00
dm-bitset.h	dm persistent data: add bitset	2013-03-01 22:45:51 +00:00
dm-block-manager.c	dm: add cache target	2013-03-01 22:45:51 +00:00
dm-block-manager.h	dm persistent data: introduce dm_bm_set_read_only	2012-07-27 15:08:15 +01:00
dm-btree-internal.h	dm persistent data: add btree_walk	2013-03-01 22:45:50 +00:00
dm-btree-remove.c	dm thin: fix discard corruption	2013-03-20 17:21:24 +00:00
dm-btree-spine.c	dm persistent data: add btree_walk	2013-03-01 22:45:50 +00:00
dm-btree.c	dm persistent data: add btree_walk	2013-03-01 22:45:50 +00:00
dm-btree.h	dm persistent data: add btree_walk	2013-03-01 22:45:50 +00:00
dm-persistent-data-internal.h
dm-space-map-common.c	dm persistent data: use DMERR_LIMIT for errors	2012-12-21 20:23:34 +00:00
dm-space-map-common.h	dm persistent data: only commit space map if index changed	2012-07-27 15:08:06 +01:00
dm-space-map-disk.c	dm persistent data: remove debug space map checker	2012-07-27 15:07:58 +01:00
dm-space-map-disk.h
dm-space-map-metadata.c	dm persistent data: improve improve space map block alloc failure message	2012-12-21 20:23:36 +00:00
dm-space-map-metadata.h
dm-space-map.h
dm-transaction-manager.c	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
dm-transaction-manager.h	dm persistent data: tidy transaction manager creation fns	2012-07-27 15:08:09 +01:00
Kconfig	dm persistent data: remove CONFIG_EXPERIMENTAL	2013-03-01 22:45:46 +00:00
Makefile	dm persistent data: add bitset	2013-03-01 22:45:51 +00:00