md: raid1/raid10: handle allocation errors during array setup.

[safe/jmp/linux-2.6] / drivers / md / md.h

diff --git a/drivers/md/md.h b/drivers/md/md.h
index 78f0316..f184b69 100644 (file)
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -201,7 +201,7 @@ struct mddev_s
         * INTR:     resync needs to be aborted for some reason
         * 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
+        * CHECK:    user-space request for check-only, no repair
         * RESHAPE:  A reshape is happening
         *
         * If neither SYNC or RESHAPE are set, then it is a recovery.
@@ -223,6 +223,16 @@ struct mddev_s
                                                            * so we don't loop trying */
 
        int                             in_sync;        /* know to not need resync */
+       /* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so
+        * that we are never stopping an array while it is open.
+        * 'reconfig_mutex' protects all other reconfiguration.
+        * These locks are separate due to conflicting interactions
+        * with bdev->bd_mutex.
+        * Lock ordering is:
+        *  reconfig_mutex -> bd_mutex : e.g. do_md_run -> revalidate_disk
+        *  bd_mutex -> open_mutex:  e.g. __blkdev_get -> md_open
+        */
+       struct mutex                    open_mutex;
        struct mutex                    reconfig_mutex;
        atomic_t                        active;         /* general refcount */
        atomic_t                        openers;        /* number of active opens */
@@ -420,6 +430,7 @@ extern void md_write_end(mddev_t *mddev);
 extern void md_done_sync(mddev_t *mddev, int blocks, int ok);
 extern void md_error(mddev_t *mddev, mdk_rdev_t *rdev);
 
+extern int mddev_congested(mddev_t *mddev, int bits);
 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);