From 8ddf9efe6708f3674f0ddfeb6425fd27bea109a2 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Fri, 9 Sep 2005 16:23:45 -0700 Subject: [PATCH] md: support write-mostly device in raid1 This allows a device in a raid1 to be marked as "write mostly". Read requests will only be sent if there is no other option. Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/raid/md_k.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/linux/raid/md_k.h') diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h index 817062bf7352..7ef78e15ce04 100644 --- a/include/linux/raid/md_k.h +++ b/include/linux/raid/md_k.h @@ -181,6 +181,9 @@ struct mdk_rdev_s int faulty; /* if faulty do not issue IO requests */ int in_sync; /* device is a full member of the array */ + unsigned long flags; /* Should include faulty and in_sync here. */ +#define WriteMostly 4 /* Avoid reading if at all possible */ + int desc_nr; /* descriptor index in the superblock */ int raid_disk; /* role of device in array */ int saved_raid_disk; /* role that device used to have in the -- cgit v1.2.3-59-g8ed1b