bcachefs: Add snapshot to bch_inode_unpacked

this allows for various cleanups in fsck
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/inode.c

@@ -320,9 +320,11 @@ static noinline int bch2_inode_unpack_slowpath(struct bkey_s_c k,
 int bch2_inode_unpack(struct bkey_s_c k,
 		      struct bch_inode_unpacked *unpacked)
 {
-	if (likely(k.k->type == KEY_TYPE_inode_v3))
-		return bch2_inode_unpack_v3(k, unpacked);
-	return bch2_inode_unpack_slowpath(k, unpacked);
+	unpacked->bi_snapshot = k.k->p.snapshot;
+
+	return likely(k.k->type == KEY_TYPE_inode_v3)
+		? bch2_inode_unpack_v3(k, unpacked)
+		: bch2_inode_unpack_slowpath(k, unpacked);
 }
 
 int bch2_inode_peek_nowarn(struct btree_trans *trans,
@@ -557,7 +559,7 @@ static void __bch2_inode_unpacked_to_text(struct printbuf *out,
 
 void bch2_inode_unpacked_to_text(struct printbuf *out, struct bch_inode_unpacked *inode)
 {
-	prt_printf(out, "inum: %llu ", inode->bi_inum);
+	prt_printf(out, "inum: %llu:%u ", inode->bi_inum, inode->bi_snapshot);
 	__bch2_inode_unpacked_to_text(out, inode);
 }
 

fs/bcachefs/inode.h

@@ -69,6 +69,7 @@ typedef u64 u96;
 
 struct bch_inode_unpacked {
 	u64			bi_inum;
+	u32			bi_snapshot;
 	u64			bi_journal_seq;
 	__le64			bi_hash_seed;
 	u64			bi_size;