md/raid1: fix potential data inconsistency issue with write behind device

[mirror_ubuntu-jammy-kernel.git] / drivers / md / md.h

diff --git a/drivers/md/md.h b/drivers/md/md.h
index 257cb4c9e22bad7718a046cf4b614420a0730752..d449d514cff9886471b6530dcb08454472f77403 100644 (file)
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -1,15 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
    md.h : kernel internal structure of the Linux MD driver
           Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
-
-   You should have received a copy of the GNU General Public License
-   (for example /usr/src/linux/COPYING); if not, write to the Free
-   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
 #ifndef _MD_MD_H
@@ -116,6 +109,14 @@ struct md_rdev {
                                           * for reporting to userspace and storing
                                           * in superblock.
                                           */
+
+       /*
+        * The members for check collision of write behind IOs.
+        */
+       struct list_head wb_list;
+       spinlock_t wb_list_lock;
+       wait_queue_head_t wb_io_wait;
+
        struct work_struct del_work;    /* used for delayed sysfs removal */
 
        struct kernfs_node *sysfs_state; /* handle for 'state'
@@ -200,6 +201,10 @@ enum flag_bits {
                                 * it didn't fail, so don't use FailFast
                                 * any more for metadata
                                 */
+       WBCollisionCheck,       /*
+                                * multiqueue device should check if there
+                                * is collision between write behind bios.
+                                */
 };
 
 static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors,
@@ -252,6 +257,14 @@ enum mddev_sb_flags {
        MD_SB_NEED_REWRITE,     /* metadata write needs to be repeated */
 };
 
+#define NR_WB_INFOS    8
+/* record current range of write behind IOs */
+struct wb_info {
+       sector_t lo;
+       sector_t hi;
+       struct list_head list;
+};
+
 struct mddev {
        void                            *private;
        struct md_personality           *pers;
@@ -468,6 +481,7 @@ struct mddev {
                                          */
        struct work_struct flush_work;
        struct work_struct event_work;  /* used by dm to report failure event */
+       mempool_t *wb_info_pool;
        void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev);
        struct md_cluster_info          *cluster_info;
        unsigned int                    good_device_nr; /* good device num within cluster raid */