1 files changed, 21 insertions, 4 deletions

diff --git a/include/linux/raid/raid5.h b/include/linux/raid/raid5.h
index 394da8207b34..914af667044f 100644
--- a/include/linux/raid/raid5.h
+++ b/include/linux/raid/raid5.h
@@ -135,6 +135,7 @@ struct stripe_head {
         atomic_t                count;                  /* nr of active thread/requests */
         spinlock_t              lock;
         int                     bm_seq; /* sequence number for bitmap flushes */
+        int                     disks;                  /* disks in stripe */
         struct r5dev {
                 struct bio      req;
                 struct bio_vec  vec;
@@ -156,6 +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
  */
@@ -174,7 +176,9 @@ struct stripe_head {
 #define STRIPE_DELAYED          6
 #define STRIPE_DEGRADED         7
 #define STRIPE_BIT_DELAY        8
-
+#define STRIPE_EXPANDING        9
+#define STRIPE_EXPAND_SOURCE    10
+#define STRIPE_EXPAND_READY     11
 /*
  * Plugging:
  *
@@ -211,12 +215,24 @@ struct raid5_private_data {
         int                     raid_disks, working_disks, failed_disks;
         int                     max_nr_stripes;
 
+        /* used during an expand */
+        sector_t                expand_progress;        /* MaxSector when no expand happening */
+        sector_t                expand_lo; /* from here up to expand_progress it out-of-bounds
+                                            * as we haven't flushed the metadata yet
+                                            */
+        int                     previous_raid_disks;
+
         struct list_head        handle_list; /* stripes needing handling */
         struct list_head        delayed_list; /* stripes that have plugged requests */
         struct list_head        bitmap_list; /* stripes delaying awaiting bitmap update */
         atomic_t                preread_active_stripes; /* stripes with scheduled io */
 
-        char                    cache_name[20];
+        atomic_t                reshape_stripes; /* stripes with pending writes for reshape */
+        /* unfortunately we need two cache names as we temporarily have
+         * two caches.
+         */
+        int                     active_name;
+        char                    cache_name[2][20];
         kmem_cache_t            *slab_cache; /* for allocating stripes */
 
         int                     seq_flush, seq_write;
@@ -238,9 +254,10 @@ struct raid5_private_data {
         wait_queue_head_t       wait_for_overlap;
         int                     inactive_blocked;       /* release of inactive stripes blocked,
                                                          * waiting for 25% to be free
-                                                         */        
+                                                         */
+        int                     pool_size; /* number of disks in stripeheads in pool */
         spinlock_t              device_lock;
-        struct disk_info        disks[0];
+        struct disk_info        *disks;
 };
 
 typedef struct raid5_private_data raid5_conf_t;