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authorNeilBrown <neilb@suse.de>2006-01-06 00:20:12 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 08:34:01 -0800
commit17999be4aa408e7ff3b9d32c735649676567a3cd (patch)
tree14f9fd4ef0299f16274ce2980baef7b96f111bea /include/linux/raid/raid1.h
parentac81b2ee45eb811fdb0aa1cfb71d468d944d00ce (diff)
downloadop-kernel-dev-17999be4aa408e7ff3b9d32c735649676567a3cd.zip
op-kernel-dev-17999be4aa408e7ff3b9d32c735649676567a3cd.tar.gz
[PATCH] md: improve raid1 "IO Barrier" concept
raid1 needs to put up a barrier to new requests while it does resync or other background recovery. The code for this is currently open-coded, slighty obscure by its use of two waitqueues, and not documented. This patch gathers all the related code into 4 functions, and includes a comment which (hopefully) explains what is happening. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/raid/raid1.h')
-rw-r--r--include/linux/raid/raid1.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/raid/raid1.h b/include/linux/raid/raid1.h
index 292b98f..c556742 100644
--- a/include/linux/raid/raid1.h
+++ b/include/linux/raid/raid1.h
@@ -45,6 +45,7 @@ struct r1_private_data_s {
spinlock_t resync_lock;
int nr_pending;
+ int nr_waiting;
int barrier;
sector_t next_resync;
int fullsync; /* set to 1 if a full sync is needed,
@@ -52,8 +53,7 @@ struct r1_private_data_s {
* Cleared when a sync completes.
*/
- wait_queue_head_t wait_idle;
- wait_queue_head_t wait_resume;
+ wait_queue_head_t wait_barrier;
struct pool_info *poolinfo;
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