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authorNeilBrown <neilb@suse.de>2006-03-27 01:18:09 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-27 08:45:01 -0800
commitccfcc3c10b2a5cb8fd3c918199a4ff904fc6fb3e (patch)
tree0c86fe6ba0f0bafd76f86f81b7425d6d497664aa /include/linux/raid/raid5.h
parent7ecaa1e6a1ad69862e9980b6c777e11f26c4782d (diff)
[PATCH] md: Core of raid5 resize process
This patch provides the core of the resize/expand process. sync_request notices if a 'reshape' is happening and acts accordingly. It allocated new stripe_heads for the next chunk-wide-stripe in the target geometry, marking them STRIPE_EXPANDING. Then it finds which stripe heads in the old geometry can provide data needed by these and marks them STRIPE_EXPAND_SOURCE. This causes stripe_handle to read all blocks on those stripes. Once all blocks on a STRIPE_EXPAND_SOURCE stripe_head are read, any that are needed are copied into the corresponding STRIPE_EXPANDING stripe_head. Once a STRIPE_EXPANDING stripe_head is full, it is marks STRIPE_EXPAND_READY and then is written out and released. 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/raid5.h')
-rw-r--r--include/linux/raid/raid5.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/raid/raid5.h b/include/linux/raid/raid5.h
index 6fa274aea2a..55c738d5050 100644
--- a/include/linux/raid/raid5.h
+++ b/include/linux/raid/raid5.h
@@ -157,6 +157,7 @@ struct stripe_head {
#define R5_ReadError 8 /* seen a read error here recently */
#define R5_ReWrite 9 /* have tried to over-write the readerror */
+#define R5_Expanded 10 /* This block now has post-expand data */
/*
* Write method
*/
@@ -176,7 +177,8 @@ struct stripe_head {
#define STRIPE_DEGRADED 7
#define STRIPE_BIT_DELAY 8
#define STRIPE_EXPANDING 9
-
+#define STRIPE_EXPAND_SOURCE 10
+#define STRIPE_EXPAND_READY 11
/*
* Plugging:
*