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authorNeilBrown <neilb@cse.unsw.edu.au>2005-06-21 17:17:26 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-21 19:07:46 -0700
commit3d310eb7b3df1252e8595d059d982b0a9825a137 (patch)
tree9bca5e7eaa437d60010c1745b9aeb9592439d482 /include/linux/raid/md_k.h
parent41158c7eb22312cfaa256744e1553bb4042ff085 (diff)
[PATCH] md: fix deadlock due to md thread processing delayed requests.
Before completing a 'write' the md superblock might need to be updated. This is best done by the md_thread. The current code schedules this up and queues the write request for later handling by the md_thread. However some personalities (Raid5/raid6) will deadlock if the md_thread tries to submit requests to its own array. So this patch changes things so the processes submitting the request waits for the superblock to be written and then submits the request itself. This fixes a recently-created deadlock in raid5/raid6 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.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index 6cdcb4434c6..3e977025cf4 100644
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -261,7 +261,7 @@ struct mddev_s
sector_t recovery_cp;
spinlock_t write_lock;
- struct bio_list write_list;
+ wait_queue_head_t sb_wait; /* for waiting on superblock updates */
unsigned int safemode; /* if set, update "clean" superblock
* when no writes pending.