bcachefs-tools/libbcachefs/opts.c

#include <linux/kernel.h>

#include "opts.h"
#include "util.h"

const char * const bch2_error_actions[] = {
	"continue",
	"remount-ro",
	"panic",
	NULL
};

const char * const bch2_csum_types[] = {
	"none",
	"crc32c",
	"crc64",
	NULL
};

const char * const bch2_compression_types[] = {
	"none",
	"lz4",
	"gzip",
	NULL
};

const char * const bch2_str_hash_types[] = {
	"crc32c",
	"crc64",
	"siphash",
	NULL
};

const char * const bch2_data_types[] = {
	"none",
	"sb",
	"journal",
	"btree",
	"data",
	NULL
};

const char * const bch2_cache_replacement_policies[] = {
	"lru",
	"fifo",
	"random",
	NULL
};

/* Default is -1; we skip past it for struct cached_dev's cache mode */
const char * const bch2_cache_modes[] = {
	"default",
	"writethrough",
	"writeback",
	"writearound",
	"none",
	NULL
};

const char * const bch2_dev_state[] = {
	"readwrite",
	"readonly",
	"failed",
	"spare",
	NULL
};

void bch2_opts_apply(struct bch_opts *dst, struct bch_opts src)
{
#define BCH_OPT(_name, ...)						\
	if (opt_defined(src, _name))					\
		opt_set(*dst, _name, src._name);

	BCH_OPTS()
#undef BCH_OPT
}

u64 bch2_opt_get_by_id(const struct bch_opts *opts, enum bch_opt_id id)
{
	switch (id) {
#define BCH_OPT(_name, ...)						\
	case Opt_##_name:						\
		return opts->_name;					\

	BCH_OPTS()
#undef BCH_OPT

	default:
		BUG();
	}
}

void bch2_opt_set_by_id(struct bch_opts *opts, enum bch_opt_id id, u64 v)
{
	switch (id) {
#define BCH_OPT(_name, ...)						\
	case Opt_##_name:						\
		opt_set(*opts, _name, v);				\
		break;

	BCH_OPTS()
#undef BCH_OPT

	default:
		BUG();
	}
}

/*
 * 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 BCH_OPT(_name, _bits, _mode, _type, _sb_opt, _default)		\
	if (_sb_opt != NO_SB_OPT)					\
		opt_set(opts, _name, _sb_opt(sb));

	BCH_OPTS()
#undef BCH_OPT

	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_STR(_choices)	.type = BCH_OPT_STR, .choices = _choices

#define BCH_OPT(_name, _bits, _mode, _type, _sb_opt, _default)		\
	[Opt_##_name] = {						\
		.attr	= {						\
			.name	= #_name,				\
			.mode = _mode == OPT_RUNTIME ? 0644 : 0444,	\
		},							\
		.mode	= _mode,					\
		.set_sb	= SET_##_sb_opt,				\
		_type							\
	},

	BCH_OPTS()
#undef BCH_OPT
};

static int bch2_opt_lookup(const char *name)
{
	const struct bch_option *i;

	for (i = bch2_opt_table;
	     i < bch2_opt_table + ARRAY_SIZE(bch2_opt_table);
	     i++)
		if (!strcmp(name, i->attr.name))
			return i - bch2_opt_table;

	return -1;
}

int bch2_opt_parse(const struct bch_option *opt, const char *val, u64 *res)
{
	ssize_t ret;

	switch (opt->type) {
	case BCH_OPT_BOOL:
		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);
		if (ret < 0)
			return ret;

		if (*res < opt->min || *res >= opt->max)
			return -ERANGE;
		break;
	case BCH_OPT_STR:
		ret = bch2_read_string_list(val, opt->choices);
		if (ret < 0)
			return ret;

		*res = ret;
		break;
	}

	return 0;
}

int bch2_parse_mount_opts(struct bch_opts *opts, char *options)
{
	char *opt, *name, *val;
	int ret, id;
	u64 v;

	while ((opt = strsep(&options, ",")) != NULL) {
		name	= strsep(&opt, "=");
		val	= opt;

		if (val) {
			id = bch2_opt_lookup(name);
			if (id < 0)
				goto bad_opt;

			ret = bch2_opt_parse(&bch2_opt_table[id], val, &v);
			if (ret < 0)
				goto bad_val;
		} else {
			id = bch2_opt_lookup(name);
			v = 1;

			if (id < 0 &&
			    !strncmp("no", name, 2)) {
				id = bch2_opt_lookup(name + 2);
				v = 0;
			}

			if (id < 0)
				goto bad_opt;

			if (bch2_opt_table[id].type != BCH_OPT_BOOL)
				goto no_val;
		}

		if (bch2_opt_table[id].mode < OPT_MOUNT)
			goto bad_opt;

		if (id == Opt_acl &&
		    !IS_ENABLED(CONFIG_BCACHEFS_POSIX_ACL))
			goto bad_opt;

		bch2_opt_set_by_id(opts, id, v);
	}

	return 0;
bad_opt:
	pr_err("Bad mount option %s", name);
	return -1;
bad_val:
	pr_err("Invalid value %s for mount option %s", val, name);
	return -1;
no_val:
	pr_err("Mount option %s requires a value", name);
	return -1;
}