5 files changed, 52 insertions, 10 deletions

diff --git a/include/linux/raid/bitmap.h b/include/linux/raid/bitmap.h
index 9de99198caf1..899437802aea 100644
--- a/include/linux/raid/bitmap.h
+++ b/include/linux/raid/bitmap.h
@@ -6,7 +6,13 @@
 #ifndef BITMAP_H
 #define BITMAP_H 1
 
-#define BITMAP_MAJOR 3
+#define BITMAP_MAJOR_LO 3
+/* version 4 insists the bitmap is in little-endian order
+ * with version 3, it is host-endian which is non-portable
+ */
+#define BITMAP_MAJOR_HI 4
+#define BITMAP_MAJOR_HOSTENDIAN 3
+
 #define BITMAP_MINOR 39
 
 /*
@@ -133,7 +139,8 @@ typedef __u16 bitmap_counter_t;
 /* use these for bitmap->flags and bitmap->sb->state bit-fields */
 enum bitmap_state {
         BITMAP_ACTIVE = 0x001, /* the bitmap is in use */
-        BITMAP_STALE  = 0x002  /* the bitmap file is out of date or had -EIO */
+        BITMAP_STALE  = 0x002,  /* the bitmap file is out of date or had -EIO */
+        BITMAP_HOSTENDIAN = 0x8000,
 };
 
 /* the superblock at the front of the bitmap file -- little endian */
diff --git a/include/linux/raid/md.h b/include/linux/raid/md.h
index ffa316ce4dc8..13e7c4b62367 100644
--- a/include/linux/raid/md.h
+++ b/include/linux/raid/md.h
@@ -66,8 +66,10 @@
  *     and major_version/minor_version accordingly
  * >=2 means that Internal bitmaps are supported by setting MD_SB_BITMAP_PRESENT
  *     in the super status byte
+ * >=3 means that bitmap superblock version 4 is supported, which uses
+ *     little-ending representation rather than host-endian
  */
-#define MD_PATCHLEVEL_VERSION           2
+#define MD_PATCHLEVEL_VERSION           3
 
 extern int register_md_personality (int p_num, mdk_personality_t *p);
 extern int unregister_md_personality (int p_num);
@@ -87,6 +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 ebce949b1443..46629a275ba9 100644
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -105,6 +105,8 @@ struct mdk_rdev_s
         int             sb_size;        /* bytes in the superblock */
         int             preferred_minor;        /* autorun support */
 
+        struct kobject  kobj;
+
         /* A device can be in one of three states based on two flags:
          * Not working:   faulty==1 in_sync==0
          * Fully working: faulty==0 in_sync==1
@@ -115,11 +117,12 @@ struct mdk_rdev_s
          * It can never have faulty==1, in_sync==1
          * This reduces the burden of testing multiple flags in many cases
          */
-        int faulty;                     /* if faulty do not issue IO requests */
-        int in_sync;                    /* device is a full member of the array */
 
-        unsigned long   flags;          /* Should include faulty and in_sync here. */
+        unsigned long   flags;
+#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 */
@@ -132,6 +135,9 @@ struct mdk_rdev_s
                                          * only maintained for arrays that
                                          * support hot removal
                                          */
+        atomic_t        read_errors;    /* number of consecutive read errors that
+                                         * we have tried to ignore.
+                                         */
 };
 
 typedef struct mdk_personality_s mdk_personality_t;
@@ -148,6 +154,8 @@ struct mddev_s
 
         struct gendisk                  *gendisk;
 
+        struct kobject                  kobj;
+
         /* Superblock information */
         int                             major_version,
                                         minor_version,
@@ -171,6 +179,10 @@ struct mddev_s
         sector_t                        resync_mark_cnt;/* blocks written at resync_mark */
 
         sector_t                        resync_max_sectors; /* may be set by personality */
+
+        sector_t                        resync_mismatches; /* count of sectors where
+                                                            * parity/replica mismatch found
+                                                            */
         /* recovery/resync flags 
          * NEEDED:   we might need to start a resync/recover
          * RUNNING:  a thread is running, or about to be started
@@ -178,6 +190,8 @@ struct mddev_s
          * ERR:      and IO error was detected - abort the resync/recovery
          * INTR:     someone requested a (clean) early abort.
          * DONE:     thread is done and is waiting to be reaped
+         * REQUEST:  user-space has requested a sync (used with SYNC)
+         * CHECK:    user-space request for for check-only, no repair
          */
 #define MD_RECOVERY_RUNNING     0
 #define MD_RECOVERY_SYNC        1
@@ -185,6 +199,8 @@ struct mddev_s
 #define MD_RECOVERY_INTR        3
 #define MD_RECOVERY_DONE        4
 #define MD_RECOVERY_NEEDED      5
+#define MD_RECOVERY_REQUESTED   6
+#define MD_RECOVERY_CHECK       7
         unsigned long                   recovery;
 
         int                             in_sync;        /* know to not need resync */
@@ -195,6 +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;
@@ -232,7 +255,7 @@ struct mddev_s
 
 static inline void rdev_dec_pending(mdk_rdev_t *rdev, mddev_t *mddev)
 {
-        int faulty = rdev->faulty;
+        int faulty = test_bit(Faulty, &rdev->flags);
         if (atomic_dec_and_test(&rdev->nr_pending) && faulty)
                 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
 }
@@ -270,6 +293,13 @@ struct mdk_personality_s
 };
 
 
+struct md_sysfs_entry {
+        struct attribute attr;
+        ssize_t (*show)(mddev_t *, char *);
+        ssize_t (*store)(mddev_t *, const char *, size_t);
+};
+
+
 static inline char * mdname (mddev_t * mddev)
 {
         return mddev->gendisk ? mddev->gendisk->disk_name : "mdX";
@@ -304,10 +334,8 @@ typedef struct mdk_thread_s {
         mddev_t                 *mddev;
         wait_queue_head_t       wqueue;
         unsigned long           flags;
-        struct completion       *event;
         struct task_struct      *tsk;
         unsigned long           timeout;
-        const char              *name;
 } mdk_thread_t;
 
 #define THREAD_WAKEUP  0
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
diff --git a/include/linux/raid/raid5.h b/include/linux/raid/raid5.h
index 176fc653c284..f025ba6fb14c 100644
--- a/include/linux/raid/raid5.h
+++ b/include/linux/raid/raid5.h
@@ -154,6 +154,8 @@ struct stripe_head {
 #define R5_Wantwrite    5
 #define R5_Syncio       6       /* this io need to be accounted as resync io */
 #define R5_Overlap      7       /* There is a pending overlapping request on this block */
+#define R5_ReadError    8       /* seen a read error here recently */
+#define R5_ReWrite      9       /* have tried to over-write the readerror */
 
 /*
  * Write method