linux-ext4 - [PATCH 04/12] jbd2: checking valid features early in journal_get

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Message-Id: <20230704134233.110812-5-yi.zhang@huaweicloud.com>
Date:   Tue,  4 Jul 2023 21:42:25 +0800
From:   Zhang Yi <yi.zhang@...weicloud.com>
To:     linux-ext4@...r.kernel.org
Cc:     tytso@....edu, adilger.kernel@...ger.ca, jack@...e.cz,
        yi.zhang@...wei.com, yi.zhang@...weicloud.com,
        chengzhihao1@...wei.com, yukuai3@...wei.com
Subject: [PATCH 04/12] jbd2: checking valid features early in journal_get_superblock()

From: Zhang Yi <yi.zhang@...wei.com>

journal_get_superblock() is used to check validity of the jounal
supberblock, so move the features checks from jbd2_journal_load() to
journal_get_superblock().

Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
---
 fs/jbd2/journal.c | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index c7cdb434966f..d84f26b08315 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1398,6 +1398,21 @@ static int journal_get_superblock(journal_t *journal)
 		goto out;
 	}
 
+	/*
+	 * If this is a V2 superblock, then we have to check the
+	 * features flags on it.
+	 */
+	if (!jbd2_format_support_feature(journal))
+		return 0;
+
+	if ((sb->s_feature_ro_compat &
+			~cpu_to_be32(JBD2_KNOWN_ROCOMPAT_FEATURES)) ||
+	    (sb->s_feature_incompat &
+			~cpu_to_be32(JBD2_KNOWN_INCOMPAT_FEATURES))) {
+		printk(KERN_WARNING "JBD2: Unrecognised features on journal\n");
+		goto out;
+	}
+
 	if (jbd2_has_feature_csum2(journal) &&
 	    jbd2_has_feature_csum3(journal)) {
 		/* Can't have checksum v2 and v3 at the same time! */
@@ -2059,21 +2074,6 @@ int jbd2_journal_load(journal_t *journal)
 	int err;
 	journal_superblock_t *sb = journal->j_superblock;
 
-	/*
-	 * If this is a V2 superblock, then we have to check the
-	 * features flags on it.
-	 */
-	if (jbd2_format_support_feature(journal)) {
-		if ((sb->s_feature_ro_compat &
-		     ~cpu_to_be32(JBD2_KNOWN_ROCOMPAT_FEATURES)) ||
-		    (sb->s_feature_incompat &
-		     ~cpu_to_be32(JBD2_KNOWN_INCOMPAT_FEATURES))) {
-			printk(KERN_WARNING
-				"JBD2: Unrecognised features on journal\n");
-			return -EINVAL;
-		}
-	}
-
 	/*
 	 * Create a slab for this blocksize
 	 */
-- 
2.39.2