Merge branch 'for-linus' of git://neil.brown.name/md

* 'for-linus' of git://neil.brown.name/md: (53 commits)
  md/raid5 revise rules for when to update metadata during reshape
  md/raid5: minor code cleanups in make_request.
  md: remove CONFIG_MD_RAID_RESHAPE config option.
  md/raid5: be more careful about write ordering when reshaping.
  md: don't display meaningless values in sysfs files resync_start and sync_speed
  md/raid5: allow layout and chunksize to be changed on active array.
  md/raid5: reshape using largest of old and new chunk size
  md/raid5: prepare for allowing reshape to change layout
  md/raid5: prepare for allowing reshape to change chunksize.
  md/raid5: clearly differentiate 'before' and 'after' stripes during reshape.
  Documentation/md.txt update
  md: allow number of drives in raid5 to be reduced
  md/raid5: change reshape-progress measurement to cope with reshaping backwards.
  md: add explicit method to signal the end of a reshape.
  md/raid5: enhance raid5_size to work correctly with negative delta_disks
  md/raid5: drop qd_idx from r6_state
  md/raid6: move raid6 data processing to raid6_pq.ko
  md: raid5 run(): Fix max_degraded for raid level 4.
  md: 'array_size' sysfs attribute
  md: centralize ->array_sectors modifications
  ...

1 files changed, 132 insertions, 0 deletions

diff --git a/drivers/md/raid1.h b/drivers/md/raid1.h
new file mode 100644
index 000000000000..1620eea3d57c
--- /dev/null
+++ b/drivers/md/raid1.h
@@ -0,0 +1,132 @@
+#ifndef _RAID1_H
+#define _RAID1_H
+
+typedef struct mirror_info mirror_info_t;
+
+struct mirror_info {
+        mdk_rdev_t      *rdev;
+        sector_t        head_position;
+};
+
+/*
+ * memory pools need a pointer to the mddev, so they can force an unplug
+ * when memory is tight, and a count of the number of drives that the
+ * pool was allocated for, so they know how much to allocate and free.
+ * mddev->raid_disks cannot be used, as it can change while a pool is active
+ * These two datums are stored in a kmalloced struct.
+ */
+
+struct pool_info {
+        mddev_t *mddev;
+        int     raid_disks;
+};
+
+
+typedef struct r1bio_s r1bio_t;
+
+struct r1_private_data_s {
+        mddev_t                 *mddev;
+        mirror_info_t           *mirrors;
+        int                     raid_disks;
+        int                     last_used;
+        sector_t                next_seq_sect;
+        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                     nr_waiting;
+        int                     nr_queued;
+        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_barrier;
+
+        struct pool_info        *poolinfo;
+
+        struct page             *tmppage;
+
+        mempool_t *r1bio_pool;
+        mempool_t *r1buf_pool;
+};
+
+typedef struct r1_private_data_s conf_t;
+
+/*
+ * this is the only point in the RAID code where we violate
+ * C type safety. mddev->private is an 'opaque' pointer.
+ */
+#define mddev_to_conf(mddev) ((conf_t *) mddev->private)
+
+/*
+ * this is our 'private' RAID1 bio.
+ *
+ * it contains information about what kind of IO operations were started
+ * for this RAID1 operation, and about their status:
+ */
+
+struct r1bio_s {
+        atomic_t                remaining; /* 'have we finished' count,
+                                            * used from IRQ handlers
+                                            */
+        atomic_t                behind_remaining; /* number of write-behind ios remaining
+                                                 * in this BehindIO request
+                                                 */
+        sector_t                sector;
+        int                     sectors;
+        unsigned long           state;
+        mddev_t                 *mddev;
+        /*
+         * original bio going to /dev/mdx
+         */
+        struct bio              *master_bio;
+        /*
+         * if the IO is in READ direction, then this is where we read
+         */
+        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*/
+};
+
+/* when we get a read error on a read-only array, we redirect to another
+ * device without failing the first device, or trying to over-write to
+ * correct the read error.  To keep track of bad blocks on a per-bio
+ * level, we store IO_BLOCKED in the appropriate 'bios' pointer
+ */
+#define IO_BLOCKED ((struct bio*)1)
+
+/* bits for r1bio.state */
+#define R1BIO_Uptodate  0
+#define R1BIO_IsSync    1
+#define R1BIO_Degraded  2
+#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
+ * any write-behind write succeeds, otherwise we call
+ * with failure when last write completes (and all failed).
+ * Record that bi_end_io was called with this flag...
+ */
+#define R1BIO_Returned 6
+
+#endif