linux-kernel - [PATCH md-6.12 06/41] md/md-bitmap: add 'file_pages' into struct md_bitmap

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Message-Id: <20240822024718.2158259-7-yukuai1@huaweicloud.com>
Date: Thu, 22 Aug 2024 10:46:43 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: song@...nel.org,
	mariusz.tkaczyk@...ux.intel.com,
	l@...enly.org,
	xni@...hat.com
Cc: linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org,
	yukuai3@...wei.com,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH md-6.12 06/41] md/md-bitmap: add 'file_pages' into struct md_bitmap_stats

From: Yu Kuai <yukuai3@...wei.com>

There are no functional changes, avoid dereferencing bitmap directly to
prepare inventing a new bitmap.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/md/md-bitmap.c |  7 +++++--
 drivers/md/md-bitmap.h |  1 +
 drivers/md/md.c        | 17 +++++++++++------
 3 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 105778cc34ed..82b31a46caa1 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -2096,6 +2096,7 @@ EXPORT_SYMBOL_GPL(md_bitmap_copy_from_slot);
 
 int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
 {
+	struct bitmap_storage *storage;
 	struct bitmap_counts *counts;
 	bitmap_super_t *sb;
 
@@ -2110,9 +2111,11 @@ int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
 	stats->missing_pages = counts->missing_pages;
 	stats->pages = counts->pages;
 
-	stats->events_cleared = bitmap->events_cleared;
-	stats->file = bitmap->storage.file;
+	storage = &bitmap->storage;
+	stats->file_pages = storage->file_pages;
+	stats->file = storage->file;
 
+	stats->events_cleared = bitmap->events_cleared;
 	return 0;
 }
 EXPORT_SYMBOL_GPL(md_bitmap_get_stats);
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index a43a75575769..870125670087 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -237,6 +237,7 @@ struct bitmap {
 struct md_bitmap_stats {
 	u64		events_cleared;
 	unsigned long	missing_pages;
+	unsigned long	file_pages;
 	unsigned long	sync_size;
 	unsigned long	pages;
 	struct file	*file;
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 5e1dd3009092..53e10dc28f72 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2335,7 +2335,6 @@ super_1_allow_new_offset(struct md_rdev *rdev,
 			 unsigned long long new_offset)
 {
 	/* All necessary checks on new >= old have been done */
-	struct bitmap *bitmap;
 	if (new_offset >= rdev->data_offset)
 		return 1;
 
@@ -2352,11 +2351,17 @@ super_1_allow_new_offset(struct md_rdev *rdev,
 	 */
 	if (rdev->sb_start + (32+4)*2 > new_offset)
 		return 0;
-	bitmap = rdev->mddev->bitmap;
-	if (bitmap && !rdev->mddev->bitmap_info.file &&
-	    rdev->sb_start + rdev->mddev->bitmap_info.offset +
-	    bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
-		return 0;
+
+	if (!rdev->mddev->bitmap_info.file) {
+		struct md_bitmap_stats stats;
+		int err;
+
+		err = md_bitmap_get_stats(rdev->mddev->bitmap, &stats);
+		if (!err && rdev->sb_start + rdev->mddev->bitmap_info.offset +
+		    stats.file_pages * (PAGE_SIZE >> 9) > new_offset)
+			return 0;
+	}
+
 	if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
 		return 0;
 
-- 
2.39.2