bcachefs: jset_entry_datetime

This gives us a way to record the date and time every journal entry was
written - useful for debugging.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

1 files changed, 16 insertions, 0 deletions

diff --git a/fs/bcachefs/journal_io.h b/fs/bcachefs/journal_io.h
index 1e0b9a571648..1f395f43cf76 100644
--- a/fs/bcachefs/journal_io.h
+++ b/fs/bcachefs/journal_io.h
@@ -65,4 +65,20 @@ int bch2_journal_read(struct bch_fs *, u64 *, u64 *, u64 *);
 
 CLOSURE_CALLBACK(bch2_journal_write);
 
+static inline struct jset_entry *jset_entry_init(struct jset_entry **end, size_t size)
+{
+	struct jset_entry *entry = *end;
+	unsigned u64s = DIV_ROUND_UP(size, sizeof(u64));
+
+	memset(entry, 0, u64s * sizeof(u64));
+	/*
+	 * The u64s field counts from the start of data, ignoring the shared
+	 * fields.
+	 */
+	entry->u64s = cpu_to_le16(u64s - 1);
+
+	*end = vstruct_next(*end);
+	return entry;
+}
+
 #endif /* _BCACHEFS_JOURNAL_IO_H */