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[PATCH] md: support write-mostly device in raid1

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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 <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown
2005-09-09 16:23:45 -07:00
committed by Linus Torvalds
parent 36fa30636f
commit 8ddf9efe67
4 changed files with 82 additions and 26 deletions
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3
include/linux/raid/md_k.h
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@@ -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