linux-ext4 - [PATCH] e2fsck: Avoid changes on recovery flags when jbd2_journal

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Date:   Fri, 11 Dec 2020 16:04:01 +0800
From:   Haotian Li <lihaotian9@...wei.com>
To:     <linux-ext4@...r.kernel.org>
CC:     <tytso@....edu>, "liuzhiqiang (I)" <liuzhiqiang26@...wei.com>,
        linfeilong <linfeilong@...wei.com>, <tytso@...m.mit.edu>
Subject: [PATCH] e2fsck: Avoid changes on recovery flags when
 jbd2_journal_recover() failed

jbd2_journal_revocer() may fail when some error occers
such as ENOMEM. However, jsb->s_start is still cleared
by func e2fsck_journal_release(). This may break
consistency between metadata and data in disk. Sometimes,
failure in jbd2_journal_revocer() is temporary but retry
e2fsck will skip the journal recovery when the temporary
problem is fixed.

To fix this case, we use "fatal_error" instead "goto errout"
when recover journal failed. We think if journal recovery
fails, we need send error message to user and reserve the
recovery flags to recover the journal when try e2fsck again.

Reported-by: Liangyun <liangyun2@...wei.com>
Signed-off-by: Haotian Li <lihaotian9@...wei.com>
Signed-off-by: Zhiqiang Liu <liuzhiqiang26@...wei.com>
---
 e2fsck/journal.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/e2fsck/journal.c b/e2fsck/journal.c
index 7d9f1b40..546beafd 100644
--- a/e2fsck/journal.c
+++ b/e2fsck/journal.c
@@ -952,8 +952,13 @@ static errcode_t recover_ext3_journal(e2fsck_t ctx)
 		goto errout;

 	retval = -jbd2_journal_recover(journal);
-	if (retval)
-		goto errout;
+	if (retval && retval != EFSBADCRC && retval != EFSCORRUPTED) {
+		ctx->fs->flags &= ~EXT2_FLAG_VALID;
+		com_err(ctx->program_name, 0,
+					_("Journal recovery failed "
+					  "on %s\n"), ctx->device_name);
+		fatal_error(ctx, 0);
+	}

 	if (journal->j_failed_commit) {
 		pctx.ino = journal->j_failed_commit;
-- 
2.19.1