From 2dfba3bb40ad8536b9fa802364f2d40da31aa88e Mon Sep 17 00:00:00 2001
From: Zhang Yi <yi.zhang@huawei.com>
Date: Mon, 26 Jun 2023 15:33:22 +0800
Subject: [PATCH] jbd2: correct the end of the journal recovery scan range
Git-commit: 2dfba3bb40ad8536b9fa802364f2d40da31aa88e
Patch-mainline: v6.6-rc1
References: bsc#1214955
We got a filesystem inconsistency issue below while running generic/475
I/O failure pressure test with fast_commit feature enabled.
Symlink /p3/d3/d1c/d6c/dd6/dce/l101 (inode #132605) is invalid.
If fast_commit feature is enabled, a special fast_commit journal area is
appended to the end of the normal journal area. The journal->j_last
point to the first unused block behind the normal journal area instead
of the whole log area, and the journal->j_fc_last point to the first
unused block behind the fast_commit journal area. While doing journal
recovery, do_one_pass(PASS_SCAN) should first scan the normal journal
area and turn around to the first block once it meet journal->j_last,
but the wrap() macro misuse the journal->j_fc_last, so the recovering
could not read the next magic block (commit block perhaps) and would end
early mistakenly and missing tN and every transaction after it in the
following example. Finally, it could lead to filesystem inconsistency.
| normal journal area | fast commit area |
+-------------------------------------------------+------------------+
| tN(rere) | tN+1 |~| tN-x |...| tN-1 | tN(front) | .... |
+-------------------------------------------------+------------------+
/ / /
start journal->j_last journal->j_fc_last
This patch fix it by use the correct ending journal->j_last.
Fixes: 5b849b5f96b4 ("jbd2: fast commit recovery path")
Cc: stable@kernel.org
Reported-by: Theodore Ts'o <tytso@mit.edu>
Link: https://lore.kernel.org/linux-ext4/20230613043120.GB1584772@mit.edu/
Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230626073322.3956567-1-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Acked-by: Jan Kara <jack@suse.cz>
---
fs/jbd2/recovery.c | 12 +++---------
1 file changed, 3 insertions(+), 9 deletions(-)
--- a/fs/jbd2/recovery.c
+++ b/fs/jbd2/recovery.c
@@ -224,12 +224,8 @@ static int count_tags(journal_t *journal
/* Make sure we wrap around the log correctly! */
#define wrap(journal, var) \
do { \
- unsigned long _wrap_last = \
- jbd2_has_feature_fast_commit(journal) ? \
- (journal)->j_fc_last : (journal)->j_last; \
- \
- if (var >= _wrap_last) \
- var -= (_wrap_last - (journal)->j_first); \
+ if (var >= (journal)->j_last) \
+ var -= ((journal)->j_last - (journal)->j_first); \
} while (0)
static int fc_do_one_pass(journal_t *journal,
@@ -512,9 +508,7 @@ static int do_one_pass(journal_t *journa
break;
jbd_debug(2, "Scanning for sequence ID %u at %lu/%lu\n",
- next_commit_ID, next_log_block,
- jbd2_has_feature_fast_commit(journal) ?
- journal->j_fc_last : journal->j_last);
+ next_commit_ID, next_log_block, journal->j_last);
/* Skip over each chunk of the transaction looking
* either the next descriptor block or the final commit