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| author | NeilBrown <neilb@cse.unsw.edu.au> | 2005-09-09 16:23:45 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-09 16:39:10 -0700 |
| commit | 8ddf9efe6708f3674f0ddfeb6425fd27bea109a2 (patch) | |
| tree | 90862c8fa9f04cf98423b3da1b2c5d1f01a7310d /include/linux/raid/md_k.h | |
| parent | 36fa30636fb84b209210299684e1be66d9e58217 (diff) | |
| download | lwn-8ddf9efe6708f3674f0ddfeb6425fd27bea109a2.tar.gz lwn-8ddf9efe6708f3674f0ddfeb6425fd27bea109a2.zip | |
[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 <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/raid/md_k.h')
| -rw-r--r-- | include/linux/raid/md_k.h | 3 |
1 files changed, 3 insertions, 0 deletions
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 |