linux-ext4 - [PATCH] ext4: forbid commit inconsistent quota data when errors=remount-ro

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Date: Fri, 19 Jan 2024 14:29:08 +0800
From: Ye Bin <yebin10@...wei.com>
To: <tytso@....edu>, <adilger.kernel@...ger.ca>, <linux-ext4@...r.kernel.org>
CC: <linux-kernel@...r.kernel.org>, <jack@...e.cz>, Ye Bin
	<yebin10@...wei.com>
Subject: [PATCH] ext4: forbid commit inconsistent quota data when errors=remount-ro

There's issue as follows When do IO fault injection test:
Quota error (device dm-3): find_block_dqentry: Quota for id 101 referenced but not present
Quota error (device dm-3): qtree_read_dquot: Can't read quota structure for id 101
Quota error (device dm-3): do_check_range: Getting block 2021161007 out of range 1-186
Quota error (device dm-3): qtree_read_dquot: Can't read quota structure for id 661

Now, ext4_write_dquot()/ext4_acquire_dquot()/ext4_release_dquot() may commit
inconsistent quota data even if process failed. This may lead to filesystem
corruption.
To ensure filesystem consistent when errors=remount-ro there is need to call
ext4_handle_error() to abort journal.

Signed-off-by: Ye Bin <yebin10@...wei.com>
---
 fs/ext4/super.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 0980845c8b8f..ef41b452173e 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -6873,6 +6873,10 @@ static int ext4_write_dquot(struct dquot *dquot)
 	if (IS_ERR(handle))
 		return PTR_ERR(handle);
 	ret = dquot_commit(dquot);
+	if (ret < 0)
+		ext4_error_err(dquot->dq_sb, -ret,
+			       "Failed to commit dquot type %d",
+			       dquot->dq_id.type);
 	err = ext4_journal_stop(handle);
 	if (!ret)
 		ret = err;
@@ -6889,6 +6893,10 @@ static int ext4_acquire_dquot(struct dquot *dquot)
 	if (IS_ERR(handle))
 		return PTR_ERR(handle);
 	ret = dquot_acquire(dquot);
+	if (ret < 0)
+		ext4_error_err(dquot->dq_sb, -ret,
+			      "Failed to acquire dquot type %d",
+			      dquot->dq_id.type);
 	err = ext4_journal_stop(handle);
 	if (!ret)
 		ret = err;
@@ -6908,6 +6916,10 @@ static int ext4_release_dquot(struct dquot *dquot)
 		return PTR_ERR(handle);
 	}
 	ret = dquot_release(dquot);
+	if (ret < 0)
+		ext4_error_err(dquot->dq_sb, -ret,
+			       "Failed to release dquot type %d",
+			       dquot->dq_id.type);
 	err = ext4_journal_stop(handle);
 	if (!ret)
 		ret = err;
-- 
2.31.1