add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/md/md.h
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@@ -1,15 +1,8 @@
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
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 /*
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    md.h : kernel internal structure of the Linux MD driver
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           Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman
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-   This program is free software; you can redistribute it and/or modify
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-   it under the terms of the GNU General Public License as published by
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-   the Free Software Foundation; either version 2, or (at your option)
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-   any later version.
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-
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-   You should have received a copy of the GNU General Public License
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-   (for example /usr/src/linux/COPYING); if not, write to the Free
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-   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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 */
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 #ifndef _MD_MD_H
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@@ -39,6 +32,16 @@
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  * be retried.
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  */
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 #define	MD_FAILFAST	(REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT)
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+
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+/*
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+ * The struct embedded in rdev is used to serialize IO.
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+ */
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+struct serial_in_rdev {
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+	struct rb_root_cached serial_rb;
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+	spinlock_t serial_lock;
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+	wait_queue_head_t serial_io_wait;
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+};
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+
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 /*
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  * MD's 'extended' device
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  */
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@@ -116,11 +119,17 @@
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 					   * for reporting to userspace and storing
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 					   * in superblock.
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 					   */
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+
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+	struct serial_in_rdev *serial;  /* used for raid1 io serialization */
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+
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 	struct work_struct del_work;	/* used for delayed sysfs removal */
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 	struct kernfs_node *sysfs_state; /* handle for 'state'
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 					   * sysfs entry */
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-
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+	/* handle for 'unacknowledged_bad_blocks' sysfs dentry */
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+	struct kernfs_node *sysfs_unack_badblocks;
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+	/* handle for 'bad_blocks' sysfs dentry */
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+	struct kernfs_node *sysfs_badblocks;
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 	struct badblocks badblocks;
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 	struct {
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@@ -200,6 +209,10 @@
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 				 * it didn't fail, so don't use FailFast
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 				 * any more for metadata
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 				 */
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+	CollisionCheck,		/*
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+				 * check if there is collision between raid1
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+				 * serial bios.
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+				 */
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 };
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 static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors,
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@@ -246,6 +259,9 @@
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 	MD_NOT_READY,		/* do_md_run() is active, so 'array_state'
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 				 * must not report that array is ready yet
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 				 */
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+	MD_BROKEN,              /* This is used in RAID-0/LINEAR only, to stop
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+				 * I/O in case an array member is gone/failed.
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+				 */
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 };
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 enum mddev_sb_flags {
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@@ -253,6 +269,15 @@
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 	MD_SB_CHANGE_CLEAN,	/* transition to or from 'clean' */
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 	MD_SB_CHANGE_PENDING,	/* switch from 'clean' to 'active' in progress */
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 	MD_SB_NEED_REWRITE,	/* metadata write needs to be repeated */
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+};
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+
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+#define NR_SERIAL_INFOS		8
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+/* record current range of serialize IOs */
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+struct serial_info {
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+	struct rb_node node;
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+	sector_t start;		/* start sector of rb node */
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+	sector_t last;		/* end sector of rb node */
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+	sector_t _subtree_last; /* highest sector in subtree of rb node */
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 };
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 struct mddev {
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@@ -372,7 +397,7 @@
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 	 * These locks are separate due to conflicting interactions
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 	 * with bdev->bd_mutex.
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 	 * Lock ordering is:
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-	 *  reconfig_mutex -> bd_mutex : e.g. do_md_run -> revalidate_disk
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+	 *  reconfig_mutex -> bd_mutex
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 	 *  bd_mutex -> open_mutex:  e.g. __blkdev_get -> md_open
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 	 */
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 	struct mutex			open_mutex;
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@@ -398,6 +423,9 @@
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 							 * file in sysfs.
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 							 */
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 	struct kernfs_node		*sysfs_action;  /* handle for 'sync_action' */
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+	struct kernfs_node		*sysfs_completed;	/*handle for 'sync_completed' */
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+	struct kernfs_node		*sysfs_degraded;	/*handle for 'degraded' */
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+	struct kernfs_node		*sysfs_level;		/*handle for 'level' */
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 	struct work_struct del_work;	/* used for delayed sysfs removal */
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@@ -471,11 +499,15 @@
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 					  */
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 	struct work_struct flush_work;
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 	struct work_struct event_work;	/* used by dm to report failure event */
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+	mempool_t *serial_info_pool;
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 	void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev);
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 	struct md_cluster_info		*cluster_info;
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 	unsigned int			good_device_nr;	/* good device num within cluster raid */
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+	unsigned int			noio_flag; /* for memalloc scope API */
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 	bool	has_superblocks:1;
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+	bool	fail_last_dev:1;
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+	bool	serialize_policy:1;
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 };
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 enum recovery_flags {
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@@ -518,7 +550,7 @@
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 static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors)
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 {
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-	atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io);
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+	atomic_add(nr_sectors, &bdev->bd_disk->sync_io);
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 }
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 static inline void md_sync_acct_bio(struct bio *bio, unsigned long nr_sectors)
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 	int (*check_reshape) (struct mddev *mddev);
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 	int (*start_reshape) (struct mddev *mddev);
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 	void (*finish_reshape) (struct mddev *mddev);
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+	void (*update_reshape_pos) (struct mddev *mddev);
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 	/* quiesce suspends or resumes internal processing.
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 	 * 1 - stop new actions and wait for action io to complete
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 	 * 0 - return to normal behaviour
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@@ -570,9 +603,6 @@
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 	 * array.
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 	 */
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 	void *(*takeover) (struct mddev *mddev);
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-	/* congested implements bdi.congested_fn().
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-	 * Will not be called while array is 'suspended' */
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-	int (*congested)(struct mddev *mddev, int bits);
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 	/* Changes the consistency policy of an active array. */
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 	int (*change_consistency_policy)(struct mddev *mddev, const char *buf);
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 };
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 extern void md_error(struct mddev *mddev, struct md_rdev *rdev);
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 extern void md_finish_reshape(struct mddev *mddev);
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-extern int mddev_congested(struct mddev *mddev, int bits);
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 extern bool __must_check md_flush_request(struct mddev *mddev, struct bio *bio);
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 extern void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
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 			   sector_t sector, int size, struct page *page);
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 extern void md_reload_sb(struct mddev *mddev, int raid_disk);
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 extern void md_update_sb(struct mddev *mddev, int force);
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 extern void md_kick_rdev_from_array(struct md_rdev * rdev);
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+extern void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev,
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+				     bool is_suspend);
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+extern void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev,
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+				      bool is_suspend);
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 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr);
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 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev);
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+
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+static inline bool is_mddev_broken(struct md_rdev *rdev, const char *md_type)
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+{
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+	int flags = rdev->bdev->bd_disk->flags;
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+
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+	if (!(flags & GENHD_FL_UP)) {
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+		if (!test_and_set_bit(MD_BROKEN, &rdev->mddev->flags))
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+			pr_warn("md: %s: %s array has a missing/failed member\n",
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+				mdname(rdev->mddev), md_type);
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+		return true;
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+	}
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+	return false;
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+}
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 static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev)
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 {
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 	    !bio->bi_disk->queue->limits.max_write_zeroes_sectors)
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 		mddev->queue->limits.max_write_zeroes_sectors = 0;
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 }
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+struct mdu_array_info_s;
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+struct mdu_disk_info_s;
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+
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+extern int mdp_major;
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+void md_autostart_arrays(int part);
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+int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info);
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+int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info);
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+int do_md_run(struct mddev *mddev);
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+
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+extern const struct block_device_operations md_fops;
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+
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 #endif /* _MD_MD_H */