diff options
| author |   NeilBrown <neilb@suse.de> | 2006-03-27 01:18:09 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-27 08:45:01 -0800 |
| commit | ccfcc3c10b2a5cb8fd3c918199a4ff904fc6fb3e (patch) | |
| tree | 0c86fe6ba0f0bafd76f86f81b7425d6d497664aa /include/linux/raid/raid5.h | |
| parent | [PATCH] md: Infrastructure to allow normal IO to continue while array is expanding (diff) | |
| download | linux-dev-ccfcc3c10b2a5cb8fd3c918199a4ff904fc6fb3e.tar.xz linux-dev-ccfcc3c10b2a5cb8fd3c918199a4ff904fc6fb3e.zip | |
[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.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/raid/raid5.h b/include/linux/raid/raid5.h index 6fa274aea2a0..55c738d50508 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: * |