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authorJoe Thornber <ejt@redhat.com>2012-07-27 16:08:09 +0200
committerAlasdair G Kergon <agk@redhat.com>2012-07-27 16:08:09 +0200
commit3c9ad9bd87b03032999ddbeb44bdf7938f7dbd57 (patch)
tree358c25628410d272958baca08a1975a8b213f34b /Documentation
parentdm persistent data: tidy transaction manager creation fns (diff)
downloadlinux-3c9ad9bd87b03032999ddbeb44bdf7938f7dbd57.tar.xz
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dm persistent data: stop using dm_bm_unlock_move when shadowing blocks in tm
Stop using dm_bm_unlock_move when shadowing blocks in the transaction manager as an optimisation and remove the function as it is then no longer used. Some code, such as the space maps, keeps using on-disk data structures from the previous transaction. It can do this because blocks won't be reallocated until the subsequent transaction. Using dm_bm_unlock_move to copy blocks sounds like a win, but it forces a synchronous read should the old block be accessed. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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