bcachefs: Option improvements

This adds flags for options that must be a power of two (block size and
btree node size), and options that are stored in the superblock as a
power of two (encoded extent max).

Also: options are now stored in memory in the same units they're
displayed in (bytes): we now convert when getting and setting from the
superblock.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

fs/bcachefs/bcachefs.h

@@ -928,10 +928,20 @@ static inline unsigned bucket_bytes(const struct bch_dev *ca)
 
 static inline unsigned block_bytes(const struct bch_fs *c)
 {
-	return c->opts.block_size << 9;
+	return c->opts.block_size;
 }
 
-static inline struct timespec64 bch2_time_to_timespec(struct bch_fs *c, s64 time)
+static inline unsigned block_sectors(const struct bch_fs *c)
+{
+	return c->opts.block_size >> 9;
+}
+
+static inline size_t btree_sectors(const struct bch_fs *c)
+{
+	return c->opts.btree_node_size >> 9;
+}
+
+static inline struct timespec64 bch2_time_to_timespec(const struct bch_fs *c, s64 time)
 {
 	struct timespec64 t;
 	s32 rem;
@@ -943,13 +953,13 @@ static inline struct timespec64 bch2_time_to_timespec(struct bch_fs *c, s64 time
 	return t;
 }
 
-static inline s64 timespec_to_bch2_time(struct bch_fs *c, struct timespec64 ts)
+static inline s64 timespec_to_bch2_time(const struct bch_fs *c, struct timespec64 ts)
 {
 	return (ts.tv_sec * c->sb.time_units_per_sec +
 		(int) ts.tv_nsec / c->sb.nsec_per_time_unit) - c->sb.time_base_lo;
 }
 
-static inline s64 bch2_current_time(struct bch_fs *c)
+static inline s64 bch2_current_time(const struct bch_fs *c)
 {
 	struct timespec64 now;
 

fs/bcachefs/btree_cache.h

@@ -69,7 +69,7 @@ static inline bool btree_node_hashed(struct btree *b)
 
 static inline size_t btree_bytes(struct bch_fs *c)
 {
-	return c->opts.btree_node_size << 9;
+	return c->opts.btree_node_size;
 }
 
 static inline size_t btree_max_u64s(struct bch_fs *c)
@@ -84,7 +84,7 @@ static inline size_t btree_pages(struct bch_fs *c)
 
 static inline unsigned btree_blocks(struct bch_fs *c)
 {
-	return c->opts.btree_node_size >> c->block_bits;
+	return btree_sectors(c) >> c->block_bits;
 }
 
 #define BTREE_SPLIT_THRESHOLD(c)		(btree_max_u64s(c) * 2 / 3)

fs/bcachefs/btree_io.c

@@ -682,7 +682,7 @@ static int validate_bset(struct bch_fs *c, struct bch_dev *ca,
 		     BTREE_ERR_FATAL, c, ca, b, i,
 		     "BSET_SEPARATE_WHITEOUTS no longer supported");
 
-	if (btree_err_on(offset + sectors > c->opts.btree_node_size,
+	if (btree_err_on(offset + sectors > btree_sectors(c),
 			 BTREE_ERR_FIXABLE, c, ca, b, i,
 			 "bset past end of btree node")) {
 		i->u64s = 0;
@@ -896,7 +896,7 @@ int bch2_btree_node_read_done(struct bch_fs *c, struct bch_dev *ca,
 			     b->data->keys.seq, bp->seq);
 	}
 
-	while (b->written < (ptr_written ?: c->opts.btree_node_size)) {
+	while (b->written < (ptr_written ?: btree_sectors(c))) {
 		unsigned sectors, whiteout_u64s = 0;
 		struct nonce nonce;
 		struct bch_csum csum;
@@ -1204,7 +1204,7 @@ static unsigned btree_node_sectors_written(struct bch_fs *c, void *data)
 	if (le64_to_cpu(bn->magic) !=  bset_magic(c))
 		return 0;
 
-	while (offset < c->opts.btree_node_size) {
+	while (offset < btree_sectors(c)) {
 		if (!offset) {
 			offset += vstruct_sectors(bn, c->block_bits);
 		} else {
@@ -1226,7 +1226,7 @@ static bool btree_node_has_extra_bsets(struct bch_fs *c, unsigned offset, void *
 	if (!offset)
 		return false;
 
-	while (offset < c->opts.btree_node_size) {
+	while (offset < btree_sectors(c)) {
 		bne = data + (offset << 9);
 		if (bne->keys.seq == bn->keys.seq)
 			return true;
@@ -1296,7 +1296,7 @@ static void btree_node_read_all_replicas_done(struct closure *cl)
 			if (ra->err[i])
 				continue;
 
-			while (offset < c->opts.btree_node_size) {
+			while (offset < btree_sectors(c)) {
 				if (!offset) {
 					sectors = vstruct_sectors(bn, c->block_bits);
 				} else {
@@ -1313,7 +1313,7 @@ static void btree_node_read_all_replicas_done(struct closure *cl)
 				offset += sectors;
 			}
 
-			while (offset < c->opts.btree_node_size) {
+			while (offset < btree_sectors(c)) {
 				bne = ra->buf[i] + (offset << 9);
 				if (bne->keys.seq == bn->keys.seq) {
 					if (!gap)
@@ -1793,8 +1793,8 @@ void __bch2_btree_node_write(struct bch_fs *c, struct btree *b, bool already_sta
 	BUG_ON(btree_node_fake(b));
 	BUG_ON((b->will_make_reachable != 0) != !b->written);
 
-	BUG_ON(b->written >= c->opts.btree_node_size);
-	BUG_ON(b->written & (c->opts.block_size - 1));
+	BUG_ON(b->written >= btree_sectors(c));
+	BUG_ON(b->written & (block_sectors(c) - 1));
 	BUG_ON(bset_written(b, btree_bset_last(b)));
 	BUG_ON(le64_to_cpu(b->data->magic) != bset_magic(c));
 	BUG_ON(memcmp(&b->data->format, &b->format, sizeof(b->format)));
@@ -1867,7 +1867,7 @@ void __bch2_btree_node_write(struct bch_fs *c, struct btree *b, bool already_sta
 	memset(data + bytes_to_write, 0,
 	       (sectors_to_write << 9) - bytes_to_write);
 
-	BUG_ON(b->written + sectors_to_write > c->opts.btree_node_size);
+	BUG_ON(b->written + sectors_to_write > btree_sectors(c));
 	BUG_ON(BSET_BIG_ENDIAN(i) != CPU_BIG_ENDIAN);
 	BUG_ON(i->seq != b->data->keys.seq);
 

fs/bcachefs/btree_update_interior.c

@@ -223,12 +223,12 @@ static struct btree *__bch2_btree_node_alloc(struct bch_fs *c,
 	if (IS_ERR(wp))
 		return ERR_CAST(wp);
 
-	if (wp->sectors_free < c->opts.btree_node_size) {
+	if (wp->sectors_free < btree_sectors(c)) {
 		struct open_bucket *ob;
 		unsigned i;
 
 		open_bucket_for_each(c, &wp->ptrs, ob, i)
-			if (ob->sectors_free < c->opts.btree_node_size)
+			if (ob->sectors_free < btree_sectors(c))
 				ob->sectors_free = 0;
 
 		bch2_alloc_sectors_done(c, wp);
@@ -236,7 +236,7 @@ static struct btree *__bch2_btree_node_alloc(struct bch_fs *c,
 	}
 
 	bkey_btree_ptr_v2_init(&tmp.k);
-	bch2_alloc_sectors_append_ptrs(c, wp, &tmp.k, c->opts.btree_node_size);
+	bch2_alloc_sectors_append_ptrs(c, wp, &tmp.k, btree_sectors(c));
 
 	bch2_open_bucket_get(c, wp, &ob);
 	bch2_alloc_sectors_done(c, wp);
@@ -1029,7 +1029,7 @@ bch2_btree_update_start(struct btree_trans *trans, struct btree_path *path,
 	}
 
 	ret = bch2_disk_reservation_get(c, &as->disk_res,
-			nr_nodes * c->opts.btree_node_size,
+			nr_nodes * btree_sectors(c),
 			c->opts.metadata_replicas,
 			disk_res_flags);
 	if (ret)

fs/bcachefs/btree_update_interior.h

@@ -218,7 +218,7 @@ static inline ssize_t __bch_btree_u64s_remaining(struct bch_fs *c,
 {
 	ssize_t used = bset_byte_offset(b, end) / sizeof(u64) +
 		b->whiteout_u64s;
-	ssize_t total = c->opts.btree_node_size << 6;
+	ssize_t total = c->opts.btree_node_size >> 3;
 
 	/* Always leave one extra u64 for bch2_varint_decode: */
 	used++;

fs/bcachefs/buckets.c

@@ -1000,7 +1000,7 @@ static int bch2_mark_extent(struct btree_trans *trans,
 		? BCH_DATA_btree
 		: BCH_DATA_user;
 	s64 sectors = bkey_is_btree_ptr(k.k)
-		? c->opts.btree_node_size
+		? btree_sectors(c)
 		: k.k->size;
 	s64 dirty_sectors = 0;
 	bool stale;
@@ -1609,7 +1609,7 @@ static int bch2_trans_mark_extent(struct btree_trans *trans,
 		? BCH_DATA_btree
 		: BCH_DATA_user;
 	s64 sectors = bkey_is_btree_ptr(k.k)
-		? c->opts.btree_node_size
+		? btree_sectors(c)
 		: k.k->size;
 	s64 dirty_sectors = 0;
 	bool stale;
@@ -2184,7 +2184,7 @@ int bch2_dev_buckets_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets)
 	alloc_heap	alloc_heap;
 
 	size_t btree_reserve	= DIV_ROUND_UP(BTREE_NODE_RESERVE,
-			     ca->mi.bucket_size / c->opts.btree_node_size);
+			     ca->mi.bucket_size / btree_sectors(c));
 	/* XXX: these should be tunable */
 	size_t reserve_none	= max_t(size_t, 1, nbuckets >> 9);
 	size_t copygc_reserve	= max_t(size_t, 2, nbuckets >> 6);

fs/bcachefs/compress.c

@@ -376,7 +376,7 @@ static unsigned __bio_compress(struct bch_fs *c,
 	BUG_ON(!mempool_initialized(&c->compress_workspace[compression_type]));
 
 	/* If it's only one block, don't bother trying to compress: */
-	if (bio_sectors(src) <= c->opts.block_size)
+	if (src->bi_iter.bi_size <= c->opts.block_size)
 		return 0;
 
 	dst_data = bio_map_or_bounce(c, dst, WRITE);

fs/bcachefs/extents.c

@@ -1037,7 +1037,7 @@ const char *bch2_bkey_ptrs_invalid(const struct bch_fs *c, struct bkey_s_c k)
 
 	if (k.k->type == KEY_TYPE_btree_ptr ||
 	    k.k->type == KEY_TYPE_btree_ptr_v2)
-		size_ondisk = c->opts.btree_node_size;
+		size_ondisk = btree_sectors(c);
 
 	bkey_extent_entry_for_each(ptrs, entry) {
 		if (__extent_entry_type(entry) >= BCH_EXTENT_ENTRY_MAX)

fs/bcachefs/fs.c

@@ -868,8 +868,8 @@ static int bch2_fill_extent(struct bch_fs *c,
 			else
 				offset += p.crc.offset;
 
-			if ((offset & (c->opts.block_size - 1)) ||
-			    (k.k->size & (c->opts.block_size - 1)))
+			if ((offset & (block_sectors(c) - 1)) ||
+			    (k.k->size & (block_sectors(c) - 1)))
 				flags2 |= FIEMAP_EXTENT_NOT_ALIGNED;
 
 			ret = fiemap_fill_next_extent(info,
@@ -1683,7 +1683,7 @@ static int bch2_show_options(struct seq_file *seq, struct dentry *root)
 		const struct bch_option *opt = &bch2_opt_table[i];
 		u64 v = bch2_opt_get_by_id(&c->opts, i);
 
-		if (!(opt->mode & OPT_MOUNT))
+		if (!(opt->flags & OPT_MOUNT))
 			continue;
 
 		if (v == bch2_opt_get_by_id(&bch2_opts_default, i))

fs/bcachefs/io.c

@@ -1357,7 +1357,7 @@ void bch2_write(struct closure *cl)
 	bch2_keylist_init(&op->insert_keys, op->inline_keys);
 	wbio_init(bio)->put_bio = false;
 
-	if (bio_sectors(bio) & (c->opts.block_size - 1)) {
+	if (bio->bi_iter.bi_size & (c->opts.block_size - 1)) {
 		bch_err_inum_ratelimited(c, op->pos.inode,
 					 "misaligned write");
 		op->error = -EIO;
@@ -2437,7 +2437,7 @@ int bch2_fs_io_init(struct bch_fs *c)
 			BIOSET_NEED_BVECS) ||
 	    mempool_init_page_pool(&c->bio_bounce_pages,
 				   max_t(unsigned,
-					 c->opts.btree_node_size,
+					 btree_sectors(c),
 					 c->sb.encoded_extent_max) /
 				   PAGE_SECTORS, 0) ||
 	    rhashtable_init(&c->promote_table, &bch_promote_params))

fs/bcachefs/journal_io.c

@@ -709,7 +709,7 @@ static int journal_read_bucket(struct bch_dev *ca,
 		case JOURNAL_ENTRY_NONE:
 			if (!saw_bad)
 				return 0;
-			sectors = c->opts.block_size;
+			sectors = block_sectors(c);
 			goto next_block;
 		case JOURNAL_ENTRY_BAD:
 			saw_bad = true;
@@ -718,7 +718,7 @@ static int journal_read_bucket(struct bch_dev *ca,
 			 * field of the journal entry we read, so try reading
 			 * again at next block boundary:
 			 */
-			sectors = c->opts.block_size;
+			sectors = block_sectors(c);
 			break;
 		default:
 			return ret;

fs/bcachefs/opts.c

@@ -141,41 +141,27 @@ void bch2_opt_set_by_id(struct bch_opts *opts, enum bch_opt_id id, u64 v)
 	}
 }
 
-/*
- * Initial options from superblock - here we don't want any options undefined,
- * any options the superblock doesn't specify are set to 0:
- */
-struct bch_opts bch2_opts_from_sb(struct bch_sb *sb)
-{
-	struct bch_opts opts = bch2_opts_empty();
-
-#define x(_name, _bits, _mode, _type, _sb_opt, ...)			\
-	if (_sb_opt != NO_SB_OPT)					\
-		opt_set(opts, _name, _sb_opt(sb));
-	BCH_OPTS()
-#undef x
-
-	return opts;
-}
-
 const struct bch_option bch2_opt_table[] = {
-#define OPT_BOOL()		.type = BCH_OPT_BOOL
-#define OPT_UINT(_min, _max)	.type = BCH_OPT_UINT, .min = _min, .max = _max
-#define OPT_SECTORS(_min, _max)	.type = BCH_OPT_SECTORS, .min = _min, .max = _max
-#define OPT_STR(_choices)	.type = BCH_OPT_STR, .choices = _choices
+#define OPT_BOOL()		.type = BCH_OPT_BOOL, .min = 0, .max = 2
+#define OPT_UINT(_min, _max)	.type = BCH_OPT_UINT,			\
+				.min = _min, .max = _max
+#define OPT_STR(_choices)	.type = BCH_OPT_STR,			\
+				.min = 0, .max = ARRAY_SIZE(_choices),\
+				.choices = _choices
 #define OPT_FN(_fn)		.type = BCH_OPT_FN,			\
 				.parse = _fn##_parse,			\
 				.to_text = _fn##_to_text
 
-#define x(_name, _bits, _mode, _type, _sb_opt, _default, _hint, _help)	\
+#define x(_name, _bits, _flags, _type, _sb_opt, _default, _hint, _help)	\
 	[Opt_##_name] = {						\
 		.attr	= {						\
 			.name	= #_name,				\
-			.mode = (_mode) & OPT_RUNTIME ? 0644 : 0444,	\
+			.mode = (_flags) & OPT_RUNTIME ? 0644 : 0444,	\
 		},							\
-		.mode	= _mode,					\
+		.flags	= _flags,					\
 		.hint	= _hint,					\
 		.help	= _help,					\
+		.get_sb = _sb_opt,					\
 		.set_sb	= SET_##_sb_opt,				\
 		_type							\
 	},
@@ -218,7 +204,41 @@ static int bch2_mount_opt_lookup(const char *name)
 	return bch2_opt_lookup(name);
 }
 
-int bch2_opt_parse(struct bch_fs *c, const struct bch_option *opt,
+static int bch2_opt_validate(const struct bch_option *opt, const char *msg, u64 v)
+{
+	if (v < opt->min) {
+		if (msg)
+			pr_err("invalid %s%s: too small (min %llu)",
+			       msg, opt->attr.name, opt->min);
+		return -ERANGE;
+	}
+
+	if (opt->max && v >= opt->max) {
+		if (msg)
+			pr_err("invalid %s%s: too big (max %llu)",
+			       msg, opt->attr.name, opt->max);
+		return -ERANGE;
+	}
+
+	if ((opt->flags & OPT_SB_FIELD_SECTORS) && (v & 511)) {
+		if (msg)
+			pr_err("invalid %s %s: not a multiple of 512",
+			       msg, opt->attr.name);
+		return -EINVAL;
+	}
+
+	if ((opt->flags & OPT_MUST_BE_POW_2) && !is_power_of_2(v)) {
+		if (msg)
+			pr_err("invalid %s%s: must be a power of two",
+			       msg, opt->attr.name);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+int bch2_opt_parse(struct bch_fs *c, const char *msg,
+		   const struct bch_option *opt,
 		   const char *val, u64 *res)
 {
 	ssize_t ret;
@@ -228,30 +248,13 @@ int bch2_opt_parse(struct bch_fs *c, const struct bch_option *opt,
 		ret = kstrtou64(val, 10, res);
 		if (ret < 0)
 			return ret;
-
-		if (*res > 1)
-			return -ERANGE;
 		break;
 	case BCH_OPT_UINT:
-		ret = kstrtou64(val, 10, res);
+		ret = opt->flags & OPT_HUMAN_READABLE
+			? bch2_strtou64_h(val, res)
+			: kstrtou64(val, 10, res);
 		if (ret < 0)
 			return ret;
-
-		if (*res < opt->min || *res >= opt->max)
-			return -ERANGE;
-		break;
-	case BCH_OPT_SECTORS:
-		ret = bch2_strtou64_h(val, res);
-		if (ret < 0)
-			return ret;
-
-		if (*res & 511)
-			return -EINVAL;
-
-		*res >>= 9;
-
-		if (*res < opt->min || *res >= opt->max)
-			return -ERANGE;
 		break;
 	case BCH_OPT_STR:
 		ret = match_string(opt->choices, -1, val);
@@ -264,10 +267,12 @@ int bch2_opt_parse(struct bch_fs *c, const struct bch_option *opt,
 		if (!c)
 			return 0;
 
-		return opt->parse(c, val, res);
+		ret = opt->parse(c, val, res);
+		if (ret < 0)
+			return ret;
 	}
 
-	return 0;
+	return bch2_opt_validate(opt, msg, *res);
 }
 
 void bch2_opt_to_text(struct printbuf *out, struct bch_fs *c,
@@ -288,11 +293,11 @@ void bch2_opt_to_text(struct printbuf *out, struct bch_fs *c,
 	switch (opt->type) {
 	case BCH_OPT_BOOL:
 	case BCH_OPT_UINT:
+		if (opt->flags & OPT_HUMAN_READABLE)
+			bch2_hprint(out, v);
+		else
 			pr_buf(out, "%lli", v);
 		break;
-	case BCH_OPT_SECTORS:
-		bch2_hprint(out, v << 9);
-		break;
 	case BCH_OPT_STR:
 		if (flags & OPT_SHOW_FULL_LIST)
 			bch2_string_opt_to_text(out, opt->choices, v);
@@ -365,7 +370,8 @@ int bch2_parse_mount_opts(struct bch_fs *c, struct bch_opts *opts,
 			if (id < 0)
 				goto bad_opt;
 
-			ret = bch2_opt_parse(c, &bch2_opt_table[id], val, &v);
+			ret = bch2_opt_parse(c, "mount option ",
+					     &bch2_opt_table[id], val, &v);
 			if (ret < 0)
 				goto bad_val;
 		} else {
@@ -385,7 +391,7 @@ int bch2_parse_mount_opts(struct bch_fs *c, struct bch_opts *opts,
 				goto no_val;
 		}
 
-		if (!(bch2_opt_table[id].mode & OPT_MOUNT))
+		if (!(bch2_opt_table[id].flags & OPT_MOUNT))
 			goto bad_opt;
 
 		if (id == Opt_acl &&
@@ -420,6 +426,65 @@ int bch2_parse_mount_opts(struct bch_fs *c, struct bch_opts *opts,
 	return ret;
 }
 
+/*
+ * Initial options from superblock - here we don't want any options undefined,
+ * any options the superblock doesn't specify are set to 0:
+ */
+int bch2_opts_from_sb(struct bch_opts *opts, struct bch_sb *sb)
+{
+	unsigned id;
+	int ret;
+
+	for (id = 0; id < bch2_opts_nr; id++) {
+		const struct bch_option *opt = bch2_opt_table + id;
+		u64 v;
+
+		if (opt->get_sb == NO_SB_OPT)
+			continue;
+
+		v = opt->get_sb(sb);
+
+		if (opt->flags & OPT_SB_FIELD_ILOG2)
+			v = 1ULL << v;
+
+		if (opt->flags & OPT_SB_FIELD_SECTORS)
+			v <<= 9;
+
+		ret = bch2_opt_validate(opt, "superblock option ", v);
+		if (ret)
+			return ret;
+
+		bch2_opt_set_by_id(opts, id, v);
+	}
+
+	return 0;
+}
+
+void __bch2_opt_set_sb(struct bch_sb *sb, const struct bch_option *opt, u64 v)
+{
+	if (opt->set_sb == SET_NO_SB_OPT)
+		return;
+
+	if (opt->flags & OPT_SB_FIELD_SECTORS)
+		v >>= 9;
+
+	if (opt->flags & OPT_SB_FIELD_ILOG2)
+		v = ilog2(v);
+
+	opt->set_sb(sb, v);
+}
+
+void bch2_opt_set_sb(struct bch_fs *c, const struct bch_option *opt, u64 v)
+{
+	if (opt->set_sb == SET_NO_SB_OPT)
+		return;
+
+	mutex_lock(&c->sb_lock);
+	__bch2_opt_set_sb(c->disk_sb.sb, opt, v);
+	bch2_write_super(c);
+	mutex_unlock(&c->sb_lock);
+}
+
 /* io opts: */
 
 struct bch_io_opts bch2_opts_to_inode_opts(struct bch_opts src)

fs/bcachefs/opts.h

@@ -44,19 +44,22 @@ static inline const char *bch2_d_type_str(unsigned d_type)
 LE64_BITMASK(NO_SB_OPT,		struct bch_sb, flags[0], 0, 0);
 
 /* When can be set: */
-enum opt_mode {
+enum opt_flags {
 	OPT_FS		= (1 << 0),	/* Filesystem option */
 	OPT_DEVICE	= (1 << 1),	/* Device option */
 	OPT_INODE	= (1 << 2),	/* Inode option */
 	OPT_FORMAT	= (1 << 3),	/* May be specified at format time */
 	OPT_MOUNT	= (1 << 4),	/* May be specified at mount time */
 	OPT_RUNTIME	= (1 << 5),	/* May be specified at runtime */
+	OPT_HUMAN_READABLE = (1 << 6),
+	OPT_MUST_BE_POW_2 = (1 << 7),	/* Must be power of 2 */
+	OPT_SB_FIELD_SECTORS = (1 << 8),/* Superblock field is >> 9 of actual value */
+	OPT_SB_FIELD_ILOG2 = (1 << 9),	/* Superblock field is ilog2 of actual value */
 };
 
 enum opt_type {
 	BCH_OPT_BOOL,
 	BCH_OPT_UINT,
-	BCH_OPT_SECTORS,
 	BCH_OPT_STR,
 	BCH_OPT_FN,
 };
@@ -88,13 +91,15 @@ enum opt_type {
 
 #define BCH_OPTS()							\
 	x(block_size,			u16,				\
-	  OPT_FS|OPT_FORMAT,						\
-	  OPT_SECTORS(1, 128),						\
+	  OPT_FS|OPT_FORMAT|						\
+	  OPT_HUMAN_READABLE|OPT_MUST_BE_POW_2|OPT_SB_FIELD_SECTORS,	\
+	  OPT_UINT(512, 1U << 16),					\
 	  BCH_SB_BLOCK_SIZE,		8,				\
 	  "size",	NULL)						\
-	x(btree_node_size,		u16,				\
-	  OPT_FS|OPT_FORMAT,						\
-	  OPT_SECTORS(1, 512),						\
+	x(btree_node_size,		u32,				\
+	  OPT_FS|OPT_FORMAT|						\
+	  OPT_HUMAN_READABLE|OPT_MUST_BE_POW_2|OPT_SB_FIELD_SECTORS,	\
+	  OPT_UINT(512, 1U << 20),					\
 	  BCH_SB_BTREE_NODE_SIZE,	512,				\
 	  "size",	"Btree node size, default 256k")		\
 	x(errors,			u8,				\
@@ -198,8 +203,9 @@ enum opt_type {
 	  BCH_SB_GC_RESERVE,		8,				\
 	  "%",		"Percentage of disk space to reserve for copygc")\
 	x(gc_reserve_bytes,		u64,				\
-	  OPT_FS|OPT_FORMAT|OPT_MOUNT|OPT_RUNTIME,			\
-	  OPT_SECTORS(0, U64_MAX),					\
+	  OPT_FS|OPT_FORMAT|OPT_MOUNT|OPT_RUNTIME|			\
+	  OPT_HUMAN_READABLE|OPT_SB_FIELD_SECTORS,			\
+	  OPT_UINT(0, U64_MAX),						\
 	  BCH_SB_GC_RESERVE_BYTES,	0,				\
 	  "%",		"Amount of disk space to reserve for copygc\n"	\
 			"Takes precedence over gc_reserve_percent if set")\
@@ -360,12 +366,12 @@ enum opt_type {
 			"for performance testing purposes")		\
 	x(fs_size,			u64,				\
 	  OPT_DEVICE,							\
-	  OPT_SECTORS(0, S64_MAX),					\
+	  OPT_UINT(0, S64_MAX),						\
 	  NO_SB_OPT,			0,				\
 	  "size",	"Size of filesystem on device")			\
 	x(bucket,			u32,				\
 	  OPT_DEVICE,							\
-	  OPT_SECTORS(0, S64_MAX),					\
+	  OPT_UINT(0, S64_MAX),						\
 	  NO_SB_OPT,			0,				\
 	  "size",	"Size of filesystem on device")			\
 	x(durability,			u8,				\
@@ -424,13 +430,14 @@ struct printbuf;
 
 struct bch_option {
 	struct attribute	attr;
+	u64			(*get_sb)(const struct bch_sb *);
 	void			(*set_sb)(struct bch_sb *, u64);
-	enum opt_mode		mode;
 	enum opt_type		type;
+	enum opt_flags		flags;
+	u64			min, max;
 
 	union {
 	struct {
-		u64		min, max;
 	};
 	struct {
 		const char * const *choices;
@@ -452,10 +459,13 @@ bool bch2_opt_defined_by_id(const struct bch_opts *, enum bch_opt_id);
 u64 bch2_opt_get_by_id(const struct bch_opts *, enum bch_opt_id);
 void bch2_opt_set_by_id(struct bch_opts *, enum bch_opt_id, u64);
 
-struct bch_opts bch2_opts_from_sb(struct bch_sb *);
+int bch2_opts_from_sb(struct bch_opts *, struct bch_sb *);
+void __bch2_opt_set_sb(struct bch_sb *, const struct bch_option *, u64);
+void bch2_opt_set_sb(struct bch_fs *, const struct bch_option *, u64);
 
 int bch2_opt_lookup(const char *);
-int bch2_opt_parse(struct bch_fs *, const struct bch_option *, const char *, u64 *);
+int bch2_opt_parse(struct bch_fs *, const char *, const struct bch_option *,
+		   const char *, u64 *);
 
 #define OPT_SHOW_FULL_LIST	(1 << 0)
 #define OPT_SHOW_MOUNT_STYLE	(1 << 1)

fs/bcachefs/super-io.c

@@ -267,8 +267,7 @@ const char *bch2_sb_validate(struct bch_sb_handle *disk_sb)
 
 	block_size = le16_to_cpu(sb->block_size);
 
-	if (!is_power_of_2(block_size) ||
-	    block_size > PAGE_SECTORS)
+	if (block_size > PAGE_SECTORS)
 		return "Bad block size";
 
 	if (bch2_is_zero(sb->user_uuid.b, sizeof(sb->user_uuid)))
@@ -310,9 +309,6 @@ const char *bch2_sb_validate(struct bch_sb_handle *disk_sb)
 	if (!BCH_SB_BTREE_NODE_SIZE(sb))
 		return "Btree node size not set";
 
-	if (!is_power_of_2(BCH_SB_BTREE_NODE_SIZE(sb)))
-		return "Btree node size not a power of two";
-
 	if (BCH_SB_GC_RESERVE(sb) < 5)
 		return "gc reserve percentage too small";
 
@@ -627,8 +623,12 @@ int bch2_read_super(const char *path, struct bch_opts *opts,
 	err = "Superblock block size smaller than device block size";
 	ret = -EINVAL;
 	if (le16_to_cpu(sb->sb->block_size) << 9 <
-	    bdev_logical_block_size(sb->bdev))
-		goto err;
+	    bdev_logical_block_size(sb->bdev)) {
+		pr_err("error reading superblock: Superblock block size (%u) smaller than device block size (%u)",
+		       le16_to_cpu(sb->sb->block_size) << 9,
+		       bdev_logical_block_size(sb->bdev));
+		goto err_no_print;
+	}
 
 	ret = 0;
 	sb->have_layout = true;
@@ -636,8 +636,9 @@ int bch2_read_super(const char *path, struct bch_opts *opts,
 	pr_verbose_init(*opts, "ret %i", ret);
 	return ret;
 err:
-	bch2_free_super(sb);
 	pr_err("error reading superblock: %s", err);
+err_no_print:
+	bch2_free_super(sb);
 	goto out;
 }
 

fs/bcachefs/super.c

@@ -762,10 +762,13 @@ static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts)
 		SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 100);
 
 	c->opts = bch2_opts_default;
-	bch2_opts_apply(&c->opts, bch2_opts_from_sb(sb));
+	ret = bch2_opts_from_sb(&c->opts, sb);
+	if (ret)
+		goto err;
+
 	bch2_opts_apply(&c->opts, opts);
 
-	c->block_bits		= ilog2(c->opts.block_size);
+	c->block_bits		= ilog2(block_sectors(c));
 	c->btree_foreground_merge_threshold = BTREE_FOREGROUND_MERGE_THRESHOLD(c);
 
 	if (bch2_fs_init_fault("fs_alloc")) {
@@ -877,7 +880,7 @@ static void print_mount_opts(struct bch_fs *c)
 		const struct bch_option *opt = &bch2_opt_table[i];
 		u64 v = bch2_opt_get_by_id(&c->opts, i);
 
-		if (!(opt->mode & OPT_MOUNT))
+		if (!(opt->flags & OPT_MOUNT))
 			continue;
 
 		if (v == bch2_opt_get_by_id(&bch2_opts_default, i))
@@ -1003,7 +1006,7 @@ static const char *bch2_dev_may_add(struct bch_sb *sb, struct bch_fs *c)
 	if (!sb_mi)
 		return "Invalid superblock: member info area missing";
 
-	if (le16_to_cpu(sb->block_size) != c->opts.block_size)
+	if (le16_to_cpu(sb->block_size) != block_sectors(c))
 		return "mismatched block size";
 
 	if (le16_to_cpu(sb_mi->members[sb->dev_idx].bucket_size) <

fs/bcachefs/sysfs.c

@@ -626,7 +626,7 @@ STORE(bch2_fs_opts_dir)
 	if (!tmp)
 		return -ENOMEM;
 
-	ret = bch2_opt_parse(c, opt, strim(tmp), &v);
+	ret = bch2_opt_parse(c, NULL, opt, strim(tmp), &v);
 	kfree(tmp);
 
 	if (ret < 0)
@@ -636,13 +636,7 @@ STORE(bch2_fs_opts_dir)
 	if (ret < 0)
 		return ret;
 
-	if (opt->set_sb != SET_NO_SB_OPT) {
-		mutex_lock(&c->sb_lock);
-		opt->set_sb(c->disk_sb.sb, v);
-		bch2_write_super(c);
-		mutex_unlock(&c->sb_lock);
-	}
-
+	bch2_opt_set_sb(c, opt, v);
 	bch2_opt_set_by_id(&c->opts, id, v);
 
 	if ((id == Opt_background_target ||
@@ -665,7 +659,7 @@ int bch2_opts_create_sysfs_files(struct kobject *kobj)
 	for (i = bch2_opt_table;
 	     i < bch2_opt_table + bch2_opts_nr;
 	     i++) {
-		if (!(i->mode & OPT_FS))
+		if (!(i->flags & OPT_FS))
 			continue;
 
 		ret = sysfs_create_file(kobj, &i->attr);

fs/bcachefs/xattr.c

@@ -525,7 +525,7 @@ static int bch2_xattr_bcachefs_set(const struct xattr_handler *handler,
 		memcpy(buf, value, size);
 		buf[size] = '\0';
 
-		ret = bch2_opt_parse(c, opt, buf, &v);
+		ret = bch2_opt_parse(c, NULL, opt, buf, &v);
 		kfree(buf);
 
 		if (ret < 0)