linux-ext4 - [PATCH v2 2/4] ext4, jbd2: ensure panic when journal aborting with zero errno

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Date:   Tue, 3 Dec 2019 17:27:54 +0800
From:   "zhangyi (F)" <yi.zhang@...wei.com>
To:     <linux-ext4@...r.kernel.org>
CC:     <jack@...e.com>, <tytso@....edu>, <adilger.kernel@...ger.ca>,
        <yi.zhang@...wei.com>, <liangyun2@...wei.com>,
        <luoshijie1@...wei.com>
Subject: [PATCH v2 2/4] ext4, jbd2: ensure panic when journal aborting with zero errno

JBD2_REC_ERR flag used to indicate the errno has been updated when jbd2
aborted, and then __ext4_abort() and ext4_handle_error() can invoke
panic if ERRORS_PANIC is specified. But if the journal has been aborted
with zero errno, jbd2_journal_abort() didn't set this flag so we can
no longer panic. Fix this by rename JBD2_REC_ERR to JBD2_ABORT_DONE and
set such flag even if there is no need to record errno in the jbd2 super
block.

Fixes: 4327ba52afd03 ("ext4, jbd2: ensure entering into panic after recording an error in superblock")
Signed-off-by: zhangyi (F) <yi.zhang@...wei.com>
---
 fs/ext4/super.c      |  4 ++--
 fs/jbd2/journal.c    | 10 +++++-----
 include/linux/jbd2.h |  3 ++-
 3 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index dd654e53ba3d..25b0c883bd15 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -482,7 +482,7 @@ static void ext4_handle_error(struct super_block *sb)
 		sb->s_flags |= SB_RDONLY;
 	} else if (test_opt(sb, ERRORS_PANIC)) {
 		if (EXT4_SB(sb)->s_journal &&
-		  !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
+		  !(EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT_DONE))
 			return;
 		panic("EXT4-fs (device %s): panic forced after error\n",
 			sb->s_id);
@@ -701,7 +701,7 @@ void __ext4_abort(struct super_block *sb, const char *function,
 	}
 	if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) {
 		if (EXT4_SB(sb)->s_journal &&
-		  !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
+		  !(EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT_DONE))
 			return;
 		panic("EXT4-fs panic from previous error\n");
 	}
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 1c58859aa592..a78b07841080 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -2118,12 +2118,12 @@ static void __journal_abort_soft (journal_t *journal, int errno)
 
 	__jbd2_journal_abort_hard(journal);
 
-	if (errno) {
+	if (errno)
 		jbd2_journal_update_sb_errno(journal);
-		write_lock(&journal->j_state_lock);
-		journal->j_flags |= JBD2_REC_ERR;
-		write_unlock(&journal->j_state_lock);
-	}
+
+	write_lock(&journal->j_state_lock);
+	journal->j_flags |= JBD2_ABORT_DONE;
+	write_unlock(&journal->j_state_lock);
 }
 
 /**
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index 603fbc4e2f70..71cab887fb98 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -1248,7 +1248,8 @@ JBD2_FEATURE_INCOMPAT_FUNCS(csum3,		CSUM_V3)
 #define JBD2_ABORT_ON_SYNCDATA_ERR	0x040	/* Abort the journal on file
 						 * data write error in ordered
 						 * mode */
-#define JBD2_REC_ERR	0x080	/* The errno in the sb has been recorded */
+#define JBD2_ABORT_DONE	0x080	/* Abort done, the errno in the sb has been
+				 * recorded if necessary */
 
 /*
  * Function declarations for the journaling transaction and buffer
-- 
2.17.2