linux-kernel - [PATCH 4/5] jbd2: use stable bdev pointer

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Date:   Thu,  6 Apr 2017 16:02:48 +0400
From:   Dmitry Monakhov <dmonakhov@...nvz.org>
To:     linux-kernel@...r.kernel.org
Cc:     darrick.wong@...cle.com, axboe@...nel.dk, tytso@....edu,
        jack@...e.cz, hch@...radead.org,
        Dmitry Monakhov <dmonakhov@...nvz.org>
Subject: [PATCH 4/5] jbd2: use stable bdev pointer

This prevent us from panic if someone invalidate bh under us.

Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
---
 fs/jbd2/revoke.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/jbd2/revoke.c b/fs/jbd2/revoke.c
index f9aefcd..e3b791d 100644
--- a/fs/jbd2/revoke.c
+++ b/fs/jbd2/revoke.c
@@ -459,7 +459,8 @@ int jbd2_journal_cancel_revoke(handle_t *handle, struct journal_head *jh)
 	 * state machine will get very upset later on. */
 	if (need_cancel) {
 		struct buffer_head *bh2;
-		bh2 = __find_get_block(bh->b_bdev, bh->b_blocknr, bh->b_size);
+		bh2 = __find_get_block(journal->j_dev, bh->b_blocknr,
+				       bh->b_size);
 		if (bh2) {
 			if (bh2 != bh)
 				clear_buffer_revoked(bh2);
-- 
2.9.3