From cc54ff626a56fdd7c22febd55ed24676fda8ed83 Mon Sep 17 00:00:00 2001 From: Liu Bo Date: Mon, 11 Dec 2017 14:56:31 -0700 Subject: [PATCH] Btrfs: do not merge rbios if their fail stripe index are not identical Since fail stripe index in rbio would be used to decide which algorithm reconstruction would be run, we cannot merge rbios if their's fail striped indexes are different, otherwise, one of the two reconstructions would fail. Signed-off-by: Liu Bo Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/raid56.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c index 945e940..7b382ee 100644 --- a/fs/btrfs/raid56.c +++ b/fs/btrfs/raid56.c @@ -600,6 +600,25 @@ static int rbio_can_merge(struct btrfs_raid_bio *last, if (last->operation == BTRFS_RBIO_REBUILD_MISSING) return 0; + if (last->operation == BTRFS_RBIO_READ_REBUILD) { + int fa = last->faila; + int fb = last->failb; + int cur_fa = cur->faila; + int cur_fb = cur->failb; + + if (last->faila >= last->failb) { + fa = last->failb; + fb = last->faila; + } + + if (cur->faila >= cur->failb) { + cur_fa = cur->failb; + cur_fb = cur->faila; + } + + if (fa != cur_fa || fb != cur_fb) + return 0; + } return 1; } -- 2.7.4