From fb7c02445c497943e7296cd3deee04422b63acb8 Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@mit.edu>
Date: Sun, 18 Feb 2018 23:45:18 -0500
Subject: [PATCH] ext4: pass -ESHUTDOWN code to jbd2 layer
Git-commit: fb7c02445c497943e7296cd3deee04422b63acb8
Patch-mainline: v4.17-rc1
References: bsc#1052766

Previously the jbd2 layer assumed that a file system check would be
required after a journal abort.  In the case of the deliberate file
system shutdown, this should not be necessary.  Allow the jbd2 layer
to distinguish between these two cases by using the ESHUTDOWN errno.

Also add proper locking to __journal_abort_soft().

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
Acked-by: Jan Kara <jack@suse.cz>

---
 fs/ext4/ioctl.c   |  4 ++--
 fs/jbd2/journal.c | 25 +++++++++++++++++++------
 2 files changed, 21 insertions(+), 8 deletions(-)

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 16d3d1325f5b..9ac33a7cbd32 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -493,13 +493,13 @@ static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 		set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 		if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 			(void) ext4_force_commit(sb);
-			jbd2_journal_abort(sbi->s_journal, 0);
+			jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 		}
 		break;
 	case EXT4_GOING_FLAGS_NOLOGFLUSH:
 		set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 		if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
-			jbd2_journal_abort(sbi->s_journal, 0);
+			jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 		break;
 	default:
 		return -EINVAL;
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 3fbf48ec2188..efa0c72a0b9f 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1483,12 +1483,15 @@ static void jbd2_mark_journal_empty(journal_t *journal, int write_op)
 void jbd2_journal_update_sb_errno(journal_t *journal)
 {
 	journal_superblock_t *sb = journal->j_superblock;
+	int errcode;
 
 	read_lock(&journal->j_state_lock);
-	jbd_debug(1, "JBD2: updating superblock error (errno %d)\n",
-		  journal->j_errno);
-	sb->s_errno    = cpu_to_be32(journal->j_errno);
+	errcode = journal->j_errno;
 	read_unlock(&journal->j_state_lock);
+	if (errcode == -ESHUTDOWN)
+		errcode = 0;
+	jbd_debug(1, "JBD2: updating superblock error (errno %d)\n", errcode);
+	sb->s_errno    = cpu_to_be32(errcode);
 
 	jbd2_write_superblock(journal, REQ_SYNC | REQ_FUA);
 }
@@ -2105,12 +2108,22 @@ void __jbd2_journal_abort_hard(journal_t *journal)
  * but don't do any other IO. */
 static void __journal_abort_soft (journal_t *journal, int errno)
 {
-	if (journal->j_flags & JBD2_ABORT)
-		return;
+	int old_errno;
 
-	if (!journal->j_errno)
+	write_lock(&journal->j_state_lock);
+	old_errno = journal->j_errno;
+	if (!journal->j_errno || errno == -ESHUTDOWN)
 		journal->j_errno = errno;
 
+	if (journal->j_flags & JBD2_ABORT) {
+		write_unlock(&journal->j_state_lock);
+		if (!old_errno && old_errno != -ESHUTDOWN &&
+		    errno == -ESHUTDOWN)
+			jbd2_journal_update_sb_errno(journal);
+		return;
+	}
+	write_unlock(&journal->j_state_lock);
+
 	__jbd2_journal_abort_hard(journal);
 
 	if (errno) {
-- 
2.13.6