add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/md/md.c
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@@ -555,13 +555,14 @@
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 	struct md_rdev *rdev = bio->bi_private;
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 	struct mddev *mddev = rdev->mddev;
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+	bio_put(bio);
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+
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 	rdev_dec_pending(rdev, mddev);
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 	if (atomic_dec_and_test(&mddev->flush_pending)) {
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 		/* The pre-request flush has finished */
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 		queue_work(md_wq, &mddev->flush_work);
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 	}
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-	bio_put(bio);
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 }
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 static void md_submit_flush_data(struct work_struct *ws);
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@@ -966,10 +967,12 @@
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 	} else
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 		clear_bit(LastDev, &rdev->flags);
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+	bio_put(bio);
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+
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+	rdev_dec_pending(rdev, mddev);
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+
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 	if (atomic_dec_and_test(&mddev->pending_writes))
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 		wake_up(&mddev->sb_wait);
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-	rdev_dec_pending(rdev, mddev);
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-	bio_put(bio);
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 }
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 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
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@@ -3204,6 +3207,9 @@
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 		err = kstrtouint(buf, 10, (unsigned int *)&slot);
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 		if (err < 0)
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 			return err;
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+		if (slot < 0)
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+			/* overflow */
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+			return -ENOSPC;
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 	}
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 	if (rdev->mddev->pers && slot == -1) {
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 		/* Setting 'slot' on an active array requires also
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@@ -3884,8 +3890,9 @@
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 static ssize_t
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 safe_delay_show(struct mddev *mddev, char *page)
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 {
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-	int msec = (mddev->safemode_delay*1000)/HZ;
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-	return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
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+	unsigned int msec = ((unsigned long)mddev->safemode_delay*1000)/HZ;
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+
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+	return sprintf(page, "%u.%03u\n", msec/1000, msec%1000);
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 }
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 static ssize_t
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 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
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@@ -3897,7 +3904,7 @@
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 		return -EINVAL;
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 	}
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-	if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
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+	if (strict_strtoul_scaled(cbuf, &msec, 3) < 0 || msec > UINT_MAX / HZ)
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 		return -EINVAL;
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 	if (msec == 0)
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 		mddev->safemode_delay = 0;
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@@ -4567,6 +4574,8 @@
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 	rv = kstrtouint(buf, 10, &n);
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 	if (rv < 0)
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 		return rv;
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+	if (n > INT_MAX)
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+		return -EINVAL;
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 	atomic_set(&mddev->max_corr_read_errors, n);
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 	return len;
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 }
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@@ -4881,11 +4890,21 @@
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 			return -EINVAL;
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 		err = mddev_lock(mddev);
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 		if (!err) {
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-			if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
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+			if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
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 				err =  -EBUSY;
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-			else {
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+			} else if (mddev->reshape_position == MaxSector ||
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+				   mddev->pers->check_reshape == NULL ||
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+				   mddev->pers->check_reshape(mddev)) {
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 				clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
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 				err = mddev->pers->start_reshape(mddev);
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+			} else {
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+				/*
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+				 * If reshape is still in progress, and
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+				 * md_check_recovery() can continue to reshape,
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+				 * don't restart reshape because data can be
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+				 * corrupted for raid456.
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+				 */
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+				clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
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 			}
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 			mddev_unlock(mddev);
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 		}
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@@ -5680,6 +5699,7 @@
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 	 * completely removed (mddev_delayed_delete).
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 	 */
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 	flush_workqueue(md_misc_wq);
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+	flush_workqueue(md_rdev_misc_wq);
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 	mutex_lock(&disks_mutex);
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 	error = -EEXIST;
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@@ -6296,6 +6316,8 @@
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 void md_stop(struct mddev *mddev)
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 {
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+	lockdep_assert_held(&mddev->reconfig_mutex);
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+
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 	/* stop the array and free an attached data structures.
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 	 * This is called from dm-raid
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 	 */