Merge branch 'omap-pool'

[linux-2.6-omap-h63xx.git] / drivers / md / raid1.h

diff --git a/drivers/md/raid1.h b/drivers/md/raid1.h
new file mode 100644 (file)
index 0000000..1620eea
--- /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