From: "Theodore Y. Ts'o" <tytso@mit.edu>
To: Jan Kara <jack@suse.cz>
Cc: Shijie Luo <luoshijie1@huawei.com>,
linux-ext4@vger.kernel.org, linfeilong@huawei.com
Subject: Re: [PATCH] jbd2: remove useless variable chksum_seen in do_one_pass
Date: Tue, 18 Aug 2020 15:14:59 -0400 [thread overview]
Message-ID: <20200818191459.GC162457@mit.edu> (raw)
In-Reply-To: <20200818104826.GA1902@quack2.suse.cz>
I wonder if this is even cleaner? What do folks think?
- Ted
diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c
index 2ed278f0dced..4373abbfd19a 100644
--- a/fs/jbd2/recovery.c
+++ b/fs/jbd2/recovery.c
@@ -690,14 +690,11 @@ static int do_one_pass(journal_t *journal,
* number. */
if (pass == PASS_SCAN &&
jbd2_has_feature_checksum(journal)) {
- int chksum_err, chksum_seen;
struct commit_header *cbh =
(struct commit_header *)bh->b_data;
unsigned found_chksum =
be32_to_cpu(cbh->h_chksum[0]);
- chksum_err = chksum_seen = 0;
-
if (info->end_transaction) {
journal->j_failed_commit =
info->end_transaction;
@@ -705,42 +702,23 @@ static int do_one_pass(journal_t *journal,
break;
}
- if (crc32_sum == found_chksum &&
- cbh->h_chksum_type == JBD2_CRC32_CHKSUM &&
- cbh->h_chksum_size ==
- JBD2_CRC32_CHKSUM_SIZE)
- chksum_seen = 1;
- else if (!(cbh->h_chksum_type == 0 &&
- cbh->h_chksum_size == 0 &&
- found_chksum == 0 &&
- !chksum_seen))
- /*
- * If fs is mounted using an old kernel and then
- * kernel with journal_chksum is used then we
- * get a situation where the journal flag has
- * checksum flag set but checksums are not
- * present i.e chksum = 0, in the individual
- * commit blocks.
- * Hence to avoid checksum failures, in this
- * situation, this extra check is added.
- */
- chksum_err = 1;
-
- if (chksum_err) {
- info->end_transaction = next_commit_ID;
-
- if (!jbd2_has_feature_async_commit(journal)) {
- journal->j_failed_commit =
- next_commit_ID;
- brelse(bh);
- break;
- }
- }
+ /* Neither checksum match nor unused? */
+ if (!((crc32_sum == found_chksum &&
+ cbh->h_chksum_type ==
+ JBD2_CRC32_CHKSUM &&
+ cbh->h_chksum_size ==
+ JBD2_CRC32_CHKSUM_SIZE) ||
+ (cbh->h_chksum_type == 0 &&
+ cbh->h_chksum_size == 0 &&
+ found_chksum == 0)))
+ goto chksum_error;
+
crc32_sum = ~0;
}
if (pass == PASS_SCAN &&
!jbd2_commit_block_csum_verify(journal,
bh->b_data)) {
+ chksum_error:
info->end_transaction = next_commit_ID;
if (!jbd2_has_feature_async_commit(journal)) {
next prev parent reply other threads:[~2020-08-18 19:15 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-11 2:21 [PATCH] jbd2: remove useless variable chksum_seen in do_one_pass Shijie Luo
2020-08-18 10:48 ` Jan Kara
2020-08-18 11:33 ` Shijie Luo
2020-08-18 19:14 ` Theodore Y. Ts'o [this message]
2020-08-19 2:02 ` Shijie Luo
2020-08-19 8:48 ` Jan Kara
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