linux-kernel - [PATCH 5.5 31/80] jbd2: move the clearing of b_modified flag to the journal_unmap

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Date:   Tue, 18 Feb 2020 20:54:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jan Kara <jack@...e.cz>,
        "zhangyi (F)" <yi.zhang@...wei.com>, Theodore Tso <tytso@....edu>,
        stable@...nel.org
Subject: [PATCH 5.5 31/80] jbd2: move the clearing of b_modified flag to the journal_unmap_buffer()

From: zhangyi (F) <yi.zhang@...wei.com>

commit 6a66a7ded12baa6ebbb2e3e82f8cb91382814839 upstream.

There is no need to delay the clearing of b_modified flag to the
transaction committing time when unmapping the journalled buffer, so
just move it to the journal_unmap_buffer().

Link: https://lore.kernel.org/r/20200213063821.30455-2-yi.zhang@huawei.com
Reviewed-by: Jan Kara <jack@...e.cz>
Signed-off-by: zhangyi (F) <yi.zhang@...wei.com>
Signed-off-by: Theodore Ts'o <tytso@....edu>
Cc: stable@...nel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/jbd2/commit.c      |   43 +++++++++++++++----------------------------
 fs/jbd2/transaction.c |   10 ++++++----
 2 files changed, 21 insertions(+), 32 deletions(-)

--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -976,34 +976,21 @@ restart_loop:
 		 * it. */
 
 		/*
-		* A buffer which has been freed while still being journaled by
-		* a previous transaction.
-		*/
-		if (buffer_freed(bh)) {
-			/*
-			 * If the running transaction is the one containing
-			 * "add to orphan" operation (b_next_transaction !=
-			 * NULL), we have to wait for that transaction to
-			 * commit before we can really get rid of the buffer.
-			 * So just clear b_modified to not confuse transaction
-			 * credit accounting and refile the buffer to
-			 * BJ_Forget of the running transaction. If the just
-			 * committed transaction contains "add to orphan"
-			 * operation, we can completely invalidate the buffer
-			 * now. We are rather through in that since the
-			 * buffer may be still accessible when blocksize <
-			 * pagesize and it is attached to the last partial
-			 * page.
-			 */
-			jh->b_modified = 0;
-			if (!jh->b_next_transaction) {
-				clear_buffer_freed(bh);
-				clear_buffer_jbddirty(bh);
-				clear_buffer_mapped(bh);
-				clear_buffer_new(bh);
-				clear_buffer_req(bh);
-				bh->b_bdev = NULL;
-			}
+		 * A buffer which has been freed while still being journaled
+		 * by a previous transaction, refile the buffer to BJ_Forget of
+		 * the running transaction. If the just committed transaction
+		 * contains "add to orphan" operation, we can completely
+		 * invalidate the buffer now. We are rather through in that
+		 * since the buffer may be still accessible when blocksize <
+		 * pagesize and it is attached to the last partial page.
+		 */
+		if (buffer_freed(bh) && !jh->b_next_transaction) {
+			clear_buffer_freed(bh);
+			clear_buffer_jbddirty(bh);
+			clear_buffer_mapped(bh);
+			clear_buffer_new(bh);
+			clear_buffer_req(bh);
+			bh->b_bdev = NULL;
 		}
 
 		if (buffer_jbddirty(bh)) {
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -2329,14 +2329,16 @@ static int journal_unmap_buffer(journal_
 			return -EBUSY;
 		}
 		/*
-		 * OK, buffer won't be reachable after truncate. We just set
-		 * j_next_transaction to the running transaction (if there is
-		 * one) and mark buffer as freed so that commit code knows it
-		 * should clear dirty bits when it is done with the buffer.
+		 * OK, buffer won't be reachable after truncate. We just clear
+		 * b_modified to not confuse transaction credit accounting, and
+		 * set j_next_transaction to the running transaction (if there
+		 * is one) and mark buffer as freed so that commit code knows
+		 * it should clear dirty bits when it is done with the buffer.
 		 */
 		set_buffer_freed(bh);
 		if (journal->j_running_transaction && buffer_jbddirty(bh))
 			jh->b_next_transaction = journal->j_running_transaction;
+		jh->b_modified = 0;
 		spin_unlock(&journal->j_list_lock);
 		spin_unlock(&jh->b_state_lock);
 		write_unlock(&journal->j_state_lock);