From 9e44476851e91c86c98eb92b9bc27fb801f89072 Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Thu, 11 Oct 2012 13:49:49 +1100 Subject: [PATCH] MD: raid5 avoid unnecessary zero page for trim We want to avoid zero discarded dev page, because it's useless for discard. But if we don't zero it, another read/write hit such page in the cache and will get inconsistent data. To avoid zero the page, we don't set R5_UPTODATE flag after construction is done. In this way, discard write request is still issued and finished, but read will not hit the page. If the stripe gets accessed soon, we need reread the stripe, but since the chance is low, the reread isn't a big deal. Signed-off-by: Shaohua Li Signed-off-by: NeilBrown --- Reading git-format-patch failed