---
ext2fs/journal.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/ext2fs/journal.c b/ext2fs/journal.c
index e456eafc2..c50c742f8 100644
--- a/ext2fs/journal.c
+++ b/ext2fs/journal.c
@@ -1127,7 +1127,20 @@ journal_stop_transaction_locked (journal_t *journal,
}
}
-/* Must strictly be called OUTSIDE the journal lock */
+/**
+ * Drains the thread-local deferred block queue into a new transaction.
+ * When a thread is forced to execute a synchronous checkpoint (which locks the
+ * global libdiskfs node-cache), any memory mutations triggered by the VFS
flush
+ * are intercepted and stored in a thread-local queue to prevent a recursive
+ * deadlock against the journal lock.
+ * This function "sweeps" those intercepted blocks by explicitly starting a
+ * new transaction. The act of starting the transaction automatically injects
+ * the deferred blocks into the new transaction's map (via the internal
+ * diskfs_journal_start_transaction_locked logic). We then immediately stop
+ * the transaction to allow the normal journal commit pipeline to process them.
+ *
+ * Must strictly be called OUTSIDE the journal lock.
+ */
static void
journal_drain_deferred_blocks (void)
{
@@ -1571,7 +1584,7 @@ diskfs_journal_start_transaction_locked (journal_t
*journal)
/* THE SWEEP: Safely inject deferred blocks into our brand new transaction */
if (deferred_count > 0)
{
- /* Copy to local var and reset count immediately to prevent any
+ /* Copy to local var and reset count immediately to prevent any
impossible recursion loops during dirty_block */
int count = deferred_count;
deferred_count = 0;
--
2.54.0
