bcachefs: Kill reflink option

An option was added to control whether reflink support was on or off
because for a long time, reflink + inline data extent support was
missing - but that's since been fixed, so we can drop the option now.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/bcachefs_format.h

@@ -1313,7 +1313,7 @@ LE64_BITMASK(BCH_SB_PRJQUOTA,		struct bch_sb, flags[0], 59, 60);
 
 LE64_BITMASK(BCH_SB_HAS_ERRORS,		struct bch_sb, flags[0], 60, 61);
 
-LE64_BITMASK(BCH_SB_REFLINK,		struct bch_sb, flags[0], 61, 62);
+/* bit 61 was reflink option */
 LE64_BITMASK(BCH_SB_BIG_ENDIAN,		struct bch_sb, flags[0], 62, 63);
 
 /* 61-64 unused */

fs/bcachefs/fs-io.c

@@ -2870,9 +2870,6 @@ loff_t bch2_remap_file_range(struct file *file_src, loff_t pos_src,
 	u64 aligned_len;
 	loff_t ret = 0;
 
-	if (!c->opts.reflink)
-		return -EOPNOTSUPP;
-
 	if (remap_flags & ~(REMAP_FILE_DEDUP|REMAP_FILE_ADVISORY))
 		return -EINVAL;
 

fs/bcachefs/opts.h

@@ -213,11 +213,6 @@ enum opt_type {
 	  OPT_BOOL(),							\
 	  BCH_SB_PRJQUOTA,		false,				\
 	  NULL,		"Enable project quotas")			\
-	x(reflink,			u8,				\
-	  OPT_FORMAT|OPT_MOUNT|OPT_RUNTIME,				\
-	  OPT_BOOL(),							\
-	  BCH_SB_REFLINK,		true,				\
-	  NULL,		"Enable reflink support")			\
 	x(degraded,			u8,				\
 	  OPT_MOUNT,							\
 	  OPT_BOOL(),							\

fs/bcachefs/reflink.c

@@ -204,9 +204,6 @@ s64 bch2_remap_range(struct bch_fs *c,
 	u64 src_done, dst_done;
 	int ret = 0, ret2 = 0;
 
-	if (!c->opts.reflink)
-		return -EOPNOTSUPP;
-
 	if (!percpu_ref_tryget(&c->writes))
 		return -EROFS;