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authorNeilBrown <neilb@cse.unsw.edu.au>2005-06-21 17:17:28 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-21 19:07:47 -0700
commit7bfa19f2748000d646dbdf8f48258cfe1d257b52 (patch)
tree2f7e6b0a0cba4ac01d7809224023a7dc73b94840 /include/linux/raid/md_k.h
parenta654b9d8f851f4ca02649d5825cbe6c608adb10c (diff)
[PATCH] md: allow md to update multiple superblocks in parallel.
currently, md updates all superblocks (one on each device) in series. It waits for one write to complete before starting the next. This isn't a big problem as superblock updates don't happen that often. However it is neater to do it in parallel, and if the drives in the array have gone to "sleep" after a period of idleness, then waking them is parallel is faster (and someone else should be worrying about power drain). Futher, we will need parallel superblock updates for a future patch which keeps the intent-logging bitmap near the superblock. Also remove the silly code that retired superblock updates 100 times. This simply never made sense. 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.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index a3725b57fb7..8c14ba565a4 100644
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -262,6 +262,7 @@ struct mddev_s
spinlock_t write_lock;
wait_queue_head_t sb_wait; /* for waiting on superblock updates */
+ atomic_t pending_writes; /* number of active superblock writes */
unsigned int safemode; /* if set, update "clean" superblock
* when no writes pending.