Remove kmap for page of b_frozen_data from jbd2_alloc() which always
provides an address from the direct kernel mapping.
Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
---
fs/jbd2/journal.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 312c7575b54f..9c1ffb0dc740 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -352,12 +352,13 @@ int jbd2_journal_write_metadata_buffer(transaction_t *transaction,
done_copy_out = 1;
new_folio = virt_to_folio(jh_in->b_frozen_data);
new_offset = offset_in_folio(new_folio, jh_in->b_frozen_data);
+ mapped_data = jh_in->b_frozen_data;
} else {
new_folio = bh_in->b_folio;
new_offset = offset_in_folio(new_folio, bh_in->b_data);
+ mapped_data = kmap_local_folio(new_folio, new_offset);
}
- mapped_data = kmap_local_folio(new_folio, new_offset);
/*
* Fire data frozen trigger if data already wasn't frozen. Do this
* before checking for escaping, as the trigger may modify the magic
@@ -373,7 +374,8 @@ int jbd2_journal_write_metadata_buffer(transaction_t *transaction,
*/
if (*((__be32 *)mapped_data) == cpu_to_be32(JBD2_MAGIC_NUMBER))
do_escape = 1;
- kunmap_local(mapped_data);
+ if (!jh_in->b_frozen_data)
+ kunmap_local(mapped_data);
/*
* Do we need to do a data copy?
--
2.30.0
