bcachefs: Put inline data behind a mount option for now

Inline data extents + reflink is still broken
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/io.c

@@ -1224,7 +1224,8 @@ void bch2_write(struct closure *cl)
 	data_len = min_t(u64, bio->bi_iter.bi_size,
 			 op->new_i_size - (op->pos.offset << 9));
 
-	if (data_len <= min(block_bytes(c) / 2, 1024U)) {
+	if (c->opts.inline_data &&
+	    data_len <= min(block_bytes(c) / 2, 1024U)) {
 		bch2_write_data_inline(op, data_len);
 		return;
 	}

fs/bcachefs/opts.h

@@ -181,6 +181,11 @@ enum opt_type {
 	  OPT_BOOL(),							\
 	  BCH_SB_128_BIT_MACS,		false,				\
 	  NULL,		"Store full 128 bits of cryptographic MACs, instead of 80")\
+	x(inline_data,			u8,				\
+	  OPT_MOUNT|OPT_RUNTIME,					\
+	  OPT_BOOL(),							\
+	  NO_SB_OPT,			false,				\
+	  NULL,		"Enable inline data extents")			\
 	x(acl,				u8,				\
 	  OPT_FORMAT|OPT_MOUNT,						\
 	  OPT_BOOL(),							\