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@huaweicloud.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20240514112438.1269037-6-shikemeng@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 7398020007394e0f7cf8b4fdfa6145207be52459..d69f8e0a12e0f94c2faa8ad0acf2eca08663a024 100644 (file)
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -419,12 +419,11 @@ copy_done:
        /*
         * Did we need to do an escaping?  Now we've done all the
         * copying, we can finally do so.
+        * b_frozen_data is from jbd2_alloc() which always provides an
+        * address from the direct kernels mapping.
         */
-       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;