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-rw-r--r--fs/bcachefs/journal.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/bcachefs/journal.h b/fs/bcachefs/journal.h
index ab68c5c4d8d8..47828771f9c2 100644
--- a/fs/bcachefs/journal.h
+++ b/fs/bcachefs/journal.h
@@ -350,8 +350,10 @@ static inline int journal_res_get_fast(struct journal *j,
/*
* Check if there is still room in the current journal
- * entry:
+ * entry, smp_rmb() guarantees that reads from reservations.counter
+ * occur before accessing cur_entry_u64s:
*/
+ smp_rmb();
if (new.cur_entry_offset + res->u64s > j->cur_entry_u64s)
return 0;