linux-ext4 - [PATCH 20/22] jbd2: Make credit checking more strict

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Message-Id: <20191003220613.10791-20-jack@suse.cz>
Date:   Fri,  4 Oct 2019 00:06:06 +0200
From:   Jan Kara <jack@...e.cz>
To:     <linux-ext4@...r.kernel.org>
Cc:     Ted Tso <tytso@....edu>, Jan Kara <jack@...e.cz>
Subject: [PATCH 20/22] jbd2: Make credit checking more strict

Make checking of available credits in jbd2_journal_dirty_metadata() more
strict. There should be always enough credits in the handle to write all
potential revoke descriptors. Also we warn in case there are not enough
credits since this is a bug in the filesystem.

Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/jbd2/transaction.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 8851cbbe3579..66fad49d45df 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -1458,7 +1458,7 @@ int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh)
 		 * of the transaction. This needs to be done
 		 * once a transaction -bzzz
 		 */
-		if (handle->h_total_credits <= 0) {
+		if (WARN_ON_ONCE(jbd2_handle_buffer_credits(handle) <= 0)) {
 			ret = -ENOSPC;
 			goto out_unlock_bh;
 		}
-- 
2.16.4