linux-ext4 - [PATCH 5/9] jbd2: remove unneeded kmap to do escape in jbd2_journal_write_metadata

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Date: Mon,  6 May 2024 22:17:57 +0800
From: Kemeng Shi <shikemeng@...weicloud.com>
To: tytso@....edu,
	jack@...e.com
Cc: linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 5/9] jbd2: remove unneeded kmap to do escape in jbd2_journal_write_metadata_buffer

The data to do escape could be accessed directly from b_frozen_data,
just remove unneeded kmap.

Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
---
 fs/jbd2/journal.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 77fcdc76fdfd..87f558bd2e8a 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -423,11 +423,8 @@ int jbd2_journal_write_metadata_buffer(transaction_t *transaction,
 	 * Did we need to do an escaping?  Now we've done all the
 	 * copying, we can finally do so.
 	 */
-	if (do_escape) {
-		mapped_data = kmap_local_folio(new_folio, new_offset);
-		*((unsigned int *)mapped_data) = 0;
-		kunmap_local(mapped_data);
-	}
+	if (do_escape)
+		*((unsigned int *)jh_in->b_frozen_data) = 0;
 
 	folio_set_bh(new_bh, new_folio, new_offset);
 	new_bh->b_size = bh_in->b_size;
-- 
2.30.0