[PATCH] md: raid1 support for bitmap intent logging

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>

1 files changed, 14 insertions, 2 deletions

diff --git a/include/linux/raid/raid1.h b/include/linux/raid/raid1.h
index abbfdd9afe1e..9d93cf12e890 100644
--- a/include/linux/raid/raid1.h
+++ b/include/linux/raid/raid1.h
@@ -36,12 +36,21 @@ struct r1_private_data_s {
         spinlock_t              device_lock;
 
         struct list_head        retry_list;
+        /* queue pending writes and submit them on unplug */
+        struct bio_list         pending_bio_list;
+        /* queue of writes that have been unplugged */
+        struct bio_list         flushing_bio_list;
+
         /* for use when syncing mirrors: */
 
         spinlock_t              resync_lock;
-        int nr_pending;
-        int barrier;
+        int                     nr_pending;
+        int                     barrier;
         sector_t                next_resync;
+        int                     fullsync;  /* set to 1 if a full sync is needed,
+                                            * (fresh device added).
+                                            * Cleared when a sync completes.
+                                            */
 
         wait_queue_head_t       wait_idle;
         wait_queue_head_t       wait_resume;
@@ -85,14 +94,17 @@ struct r1bio_s {
         int                     read_disk;
 
         struct list_head        retry_list;
+        struct bitmap_update    *bitmap_update;
         /*
          * if the IO is in WRITE direction, then multiple bios are used.
          * We choose the number when they are allocated.
          */
         struct bio              *bios[0];
+        /* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/
 };
 
 /* bits for r1bio.state */
 #define R1BIO_Uptodate  0
 #define R1BIO_IsSync    1
+#define R1BIO_Degraded  2
 #endif