linux-ext4 - [PATCH 1/2] e2fsck: save EXT2_ERROR

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Date:   Fri, 17 Feb 2023 18:09:21 +0800
From:   Baokun Li <libaokun1@...wei.com>
To:     <linux-ext4@...r.kernel.org>
CC:     <tytso@....edu>, <adilger.kernel@...ger.ca>, <jack@...e.cz>,
        <yi.zhang@...wei.com>, <yangerkun@...wei.com>,
        <yukuai3@...wei.com>, <libaokun1@...wei.com>
Subject: [PATCH 1/2] e2fsck: save EXT2_ERROR_FS flag during journal replay

When repairing a file system with s_errno missing from the journal
superblock but the file system superblock contains the ERROR_FS flag,
the ERROR_FS flag on the file system image is overwritten after the
journal replay, followed by a reload of the file system data from disk
and the ERROR_FS flag in memory is overwritten. Also s_errno is not set
and the ERROR_FS flag is not reset. Therefore, when checked later, no
forced check is performed, which makes it possible to have some errors
hidden in the disk image, which may make it read-only when using the
file system. So we save the ERROR_FS flag to the superblock after the
journal replay, instead of just relying on the jsb->s_errno to do this.

Signed-off-by: Baokun Li <libaokun1@...wei.com>
---
 e2fsck/journal.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/e2fsck/journal.c b/e2fsck/journal.c
index c7868d89..0144aa45 100644
--- a/e2fsck/journal.c
+++ b/e2fsck/journal.c
@@ -1683,6 +1683,7 @@ errcode_t e2fsck_run_ext3_journal(e2fsck_t ctx)
 	errcode_t	retval, recover_retval;
 	io_stats	stats = 0;
 	unsigned long long kbytes_written = 0;
+	__u16 s_error_state;

 	printf(_("%s: recovering journal\n"), ctx->device_name);
 	if (ctx->options & E2F_OPT_READONLY) {
@@ -1705,6 +1706,7 @@ errcode_t e2fsck_run_ext3_journal(e2fsck_t ctx)
 		ctx->fs->io->manager->get_stats(ctx->fs->io, &stats);
 	if (stats && stats->bytes_written)
 		kbytes_written = stats->bytes_written >> 10;
+	s_error_state = ctx->fs->super->s_state & EXT2_ERROR_FS;

 	ext2fs_mmp_stop(ctx->fs);
 	ext2fs_free(ctx->fs);
@@ -1721,6 +1723,7 @@ errcode_t e2fsck_run_ext3_journal(e2fsck_t ctx)
 	ctx->fs->now = ctx->now;
 	ctx->fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
 	ctx->fs->super->s_kbytes_written += kbytes_written;
+	ctx->fs->super->s_state |= s_error_state;

 	/* Set the superblock flags */
 	e2fsck_clear_recover(ctx, recover_retval != 0);
-- 
2.31.1