3 files changed, 12 insertions, 1 deletions

diff --git a/include/linux/raid/md.h b/include/linux/raid/md.h
index 91467a3c4a52..13e7c4b62367 100644
--- a/include/linux/raid/md.h
+++ b/include/linux/raid/md.h
@@ -89,6 +89,7 @@ extern void md_print_devices (void);
 
 extern void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
                            sector_t sector, int size, struct page *page);
+extern void md_super_wait(mddev_t *mddev);
 extern int sync_page_io(struct block_device *bdev, sector_t sector, int size,
                         struct page *page, int rw);
 
diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index 11629f92180a..d5854c2b2721 100644
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -122,6 +122,7 @@ struct mdk_rdev_s
 #define Faulty          1               /* device is known to have a fault */
 #define In_sync         2               /* device is in_sync with rest of array */
 #define WriteMostly     4               /* Avoid reading if at all possible */
+#define BarriersNotsupp 5               /* BIO_RW_BARRIER is not supported */
 
         int desc_nr;                    /* descriptor index in the superblock */
         int raid_disk;                  /* role of device in array */
@@ -210,6 +211,13 @@ struct mddev_s
         int                             degraded;       /* whether md should consider
                                                          * adding a spare
                                                          */
+        int                             barriers_work;  /* initialised to true, cleared as soon
+                                                         * as a barrier request to slave
+                                                         * fails.  Only supported
+                                                         */
+        struct bio                      *biolist;       /* bios that need to be retried
+                                                         * because BIO_RW_BARRIER is not supported
+                                                         */
 
         atomic_t                        recovery_active; /* blocks scheduled, but not written */
         wait_queue_head_t               recovery_wait;
diff --git a/include/linux/raid/raid1.h b/include/linux/raid/raid1.h
index 60e19b667548..292b98f2b408 100644
--- a/include/linux/raid/raid1.h
+++ b/include/linux/raid/raid1.h
@@ -110,7 +110,9 @@ struct r1bio_s {
 #define R1BIO_Uptodate  0
 #define R1BIO_IsSync    1
 #define R1BIO_Degraded  2
-#define R1BIO_BehindIO   3
+#define R1BIO_BehindIO  3
+#define R1BIO_Barrier   4
+#define R1BIO_BarrierRetry 5
 /* For write-behind requests, we call bi_end_io when
  * the last non-write-behind device completes, providing
  * any write was successful.  Otherwise we call when