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

* 'for-linus' of git://neil.brown.name/md: (24 commits)
  md: clean up do_md_stop
  md: fix another deadlock with removing sysfs attributes.
  md: move revalidate_disk() back outside open_mutex
  md/raid10: fix deadlock with unaligned read during resync
  md/bitmap:  separate out loading a bitmap from initialising the structures.
  md/bitmap: prepare for storing write-intent-bitmap via dm-dirty-log.
  md/bitmap: optimise scanning of empty bitmaps.
  md/bitmap: clean up plugging calls.
  md/bitmap: reduce dependence on sysfs.
  md/bitmap: white space clean up and similar.
  md/raid5: export raid5 unplugging interface.
  md/plug: optionally use plugger to unplug an array during resync/recovery.
  md/raid5: add simple plugging infrastructure.
  md/raid5: export is_congested test
  raid5: Don't set read-ahead when there is no queue
  md: add support for raising dm events.
  md: export various start/stop interfaces
  md: split out md_rdev_init
  md: be more careful setting MD_CHANGE_CLEAN
  md/raid5: ensure we create a unique name for kmem_cache when mddev has no gendisk
  ...

1 files changed, 54 insertions, 1 deletions

diff --git a/drivers/md/md.h b/drivers/md/md.h
index fc56e0f21c80..a953fe2808ae 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -29,6 +29,26 @@
 typedef struct mddev_s mddev_t;
 typedef struct mdk_rdev_s mdk_rdev_t;
 
+/* generic plugging support - like that provided with request_queue,
+ * but does not require a request_queue
+ */
+struct plug_handle {
+        void                    (*unplug_fn)(struct plug_handle *);
+        struct timer_list       unplug_timer;
+        struct work_struct      unplug_work;
+        unsigned long           unplug_flag;
+};
+#define PLUGGED_FLAG 1
+void plugger_init(struct plug_handle *plug,
+                  void (*unplug_fn)(struct plug_handle *));
+void plugger_set_plug(struct plug_handle *plug);
+int plugger_remove_plug(struct plug_handle *plug);
+static inline void plugger_flush(struct plug_handle *plug)
+{
+        del_timer_sync(&plug->unplug_timer);
+        cancel_work_sync(&plug->unplug_work);
+}
+
 /*
  * MD's 'extended' device
  */
@@ -125,6 +145,10 @@ struct mddev_s
         int                             suspended;
         atomic_t                        active_io;
         int                             ro;
+        int                             sysfs_active; /* set when sysfs deletes
+                                                       * are happening, so run/
+                                                       * takeover/stop are not safe
+                                                       */
 
         struct gendisk                  *gendisk;
 
@@ -297,9 +321,14 @@ struct mddev_s
                                                          * hot-adding a bitmap.  It should
                                                          * eventually be settable by sysfs.
                                                          */
+                /* When md is serving under dm, it might use a
+                 * dirty_log to store the bits.
+                 */
+                struct dm_dirty_log *log;
+
                 struct mutex            mutex;
                 unsigned long           chunksize;
-                unsigned long           daemon_sleep; /* how many seconds between updates? */
+                unsigned long           daemon_sleep; /* how many jiffies between updates? */
                 unsigned long           max_write_behind; /* write-behind mode */
                 int                     external;
         } bitmap_info;
@@ -308,6 +337,8 @@ struct mddev_s
         struct list_head                all_mddevs;
 
         struct attribute_group          *to_remove;
+        struct plug_handle              *plug; /* if used by personality */
+
         /* Generic barrier handling.
          * If there is a pending barrier request, all other
          * writes are blocked while the devices are flushed.
@@ -318,6 +349,7 @@ struct mddev_s
         struct bio *barrier;
         atomic_t flush_pending;
         struct work_struct barrier_work;
+        struct work_struct event_work;  /* used by dm to report failure event */
 };
 
 
@@ -382,6 +414,18 @@ struct md_sysfs_entry {
 };
 extern struct attribute_group md_bitmap_group;
 
+static inline struct sysfs_dirent *sysfs_get_dirent_safe(struct sysfs_dirent *sd, char *name)
+{
+        if (sd)
+                return sysfs_get_dirent(sd, NULL, name);
+        return sd;
+}
+static inline void sysfs_notify_dirent_safe(struct sysfs_dirent *sd)
+{
+        if (sd)
+                sysfs_notify_dirent(sd);
+}
+
 static inline char * mdname (mddev_t * mddev)
 {
         return mddev->gendisk ? mddev->gendisk->disk_name : "mdX";
@@ -474,5 +518,14 @@ extern int md_integrity_register(mddev_t *mddev);
 extern void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev);
 extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale);
 extern void restore_bitmap_write_access(struct file *file);
+extern void md_unplug(mddev_t *mddev);
+
+extern void mddev_init(mddev_t *mddev);
+extern int md_run(mddev_t *mddev);
+extern void md_stop(mddev_t *mddev);
+extern void md_stop_writes(mddev_t *mddev);
+extern void md_rdev_init(mdk_rdev_t *rdev);
 
+extern void mddev_suspend(mddev_t *mddev);
+extern void mddev_resume(mddev_t *mddev);
 #endif /* _MD_MD_H */