[linux-block.git] / fs / bcachefs / opts.c

// SPDX-License-Identifier: GPL-2.0

#include <linux/kernel.h>
#include <linux/fs_parser.h>

#include "bcachefs.h"
#include "compress.h"
#include "disk_groups.h"
#include "error.h"
#include "movinggc.h"
#include "opts.h"
#include "rebalance.h"
#include "recovery_passes.h"
#include "super-io.h"
#include "util.h"

#define x(t, n, ...) [n] = #t,

const char * const bch2_error_actions[] = {
	BCH_ERROR_ACTIONS()
	NULL
};

const char * const bch2_degraded_actions[] = {
	BCH_DEGRADED_ACTIONS()
	NULL
};

const char * const bch2_fsck_fix_opts[] = {
	BCH_FIX_ERRORS_OPTS()
	NULL
};

const char * const bch2_version_upgrade_opts[] = {
	BCH_VERSION_UPGRADE_OPTS()
	NULL
};

const char * const bch2_sb_features[] = {
	BCH_SB_FEATURES()
	NULL
};

const char * const bch2_sb_compat[] = {
	BCH_SB_COMPAT()
	NULL
};

const char * const __bch2_btree_ids[] = {
	BCH_BTREE_IDS()
	NULL
};

const char * const __bch2_csum_types[] = {
	BCH_CSUM_TYPES()
	NULL
};

const char * const __bch2_csum_opts[] = {
	BCH_CSUM_OPTS()
	NULL
};

const char * const __bch2_compression_types[] = {
	BCH_COMPRESSION_TYPES()
	NULL
};

const char * const bch2_compression_opts[] = {
	BCH_COMPRESSION_OPTS()
	NULL
};

const char * const __bch2_str_hash_types[] = {
	BCH_STR_HASH_TYPES()
	NULL
};

const char * const bch2_str_hash_opts[] = {
	BCH_STR_HASH_OPTS()
	NULL
};

const char * const __bch2_data_types[] = {
	BCH_DATA_TYPES()
	NULL
};

const char * const bch2_member_states[] = {
	BCH_MEMBER_STATES()
	NULL
};

static const char * const __bch2_jset_entry_types[] = {
	BCH_JSET_ENTRY_TYPES()
	NULL
};

static const char * const __bch2_fs_usage_types[] = {
	BCH_FS_USAGE_TYPES()
	NULL
};

#undef x

static void prt_str_opt_boundscheck(struct printbuf *out, const char * const opts[],
				    unsigned nr, const char *type, unsigned idx)
{
	if (idx < nr)
		prt_str(out, opts[idx]);
	else
		prt_printf(out, "(unknown %s %u)", type, idx);
}

#define PRT_STR_OPT_BOUNDSCHECKED(name, type)					\
void bch2_prt_##name(struct printbuf *out, type t)				\
{										\
	prt_str_opt_boundscheck(out, __bch2_##name##s, ARRAY_SIZE(__bch2_##name##s) - 1, #name, t);\
}

PRT_STR_OPT_BOUNDSCHECKED(jset_entry_type,	enum bch_jset_entry_type);
PRT_STR_OPT_BOUNDSCHECKED(fs_usage_type,	enum bch_fs_usage_type);
PRT_STR_OPT_BOUNDSCHECKED(data_type,		enum bch_data_type);
PRT_STR_OPT_BOUNDSCHECKED(csum_opt,		enum bch_csum_opt);
PRT_STR_OPT_BOUNDSCHECKED(csum_type,		enum bch_csum_type);
PRT_STR_OPT_BOUNDSCHECKED(compression_type,	enum bch_compression_type);
PRT_STR_OPT_BOUNDSCHECKED(str_hash_type,	enum bch_str_hash_type);

static int bch2_opt_fix_errors_parse(struct bch_fs *c, const char *val, u64 *res,
				     struct printbuf *err)
{
	if (!val) {
		*res = FSCK_FIX_yes;
	} else {
		int ret = match_string(bch2_fsck_fix_opts, -1, val);

		if (ret < 0 && err)
			prt_str(err, "fix_errors: invalid selection");
		if (ret < 0)
			return ret;
		*res = ret;
	}

	return 0;
}

static void bch2_opt_fix_errors_to_text(struct printbuf *out,
					struct bch_fs *c,
					struct bch_sb *sb,
					u64 v)
{
	prt_str(out, bch2_fsck_fix_opts[v]);
}

#define bch2_opt_fix_errors (struct bch_opt_fn) {	\
	.parse = bch2_opt_fix_errors_parse,		\
	.to_text = bch2_opt_fix_errors_to_text,		\
}

const char * const bch2_d_types[BCH_DT_MAX] = {
	[DT_UNKNOWN]	= "unknown",
	[DT_FIFO]	= "fifo",
	[DT_CHR]	= "chr",
	[DT_DIR]	= "dir",
	[DT_BLK]	= "blk",
	[DT_REG]	= "reg",
	[DT_LNK]	= "lnk",
	[DT_SOCK]	= "sock",
	[DT_WHT]	= "whiteout",
	[DT_SUBVOL]	= "subvol",
};

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

	BCH_OPTS()
#undef x
}

bool bch2_opt_defined_by_id(const struct bch_opts *opts, enum bch_opt_id id)
{
	switch (id) {
#define x(_name, ...)						\
	case Opt_##_name:						\
		return opt_defined(*opts, _name);
	BCH_OPTS()
#undef x
	default:
		BUG();
	}
}

u64 bch2_opt_get_by_id(const struct bch_opts *opts, enum bch_opt_id id)
{
	switch (id) {
#define x(_name, ...)						\
	case Opt_##_name:						\
		return opts->_name;
	BCH_OPTS()
#undef x
	default:
		BUG();
	}
}

void bch2_opt_set_by_id(struct bch_opts *opts, enum bch_opt_id id, u64 v)
{
	switch (id) {
#define x(_name, ...)						\
	case Opt_##_name:						\
		opt_set(*opts, _name, v);				\
		break;
	BCH_OPTS()
#undef x
	default:
		BUG();
	}
}

/* dummy option, for options that aren't stored in the superblock */
typedef u64 (*sb_opt_get_fn)(const struct bch_sb *);
typedef void (*sb_opt_set_fn)(struct bch_sb *, u64);
typedef u64 (*member_opt_get_fn)(const struct bch_member *);
typedef void (*member_opt_set_fn)(struct bch_member *, u64);

__maybe_unused static const sb_opt_get_fn	BCH2_NO_SB_OPT = NULL;
__maybe_unused static const sb_opt_set_fn	SET_BCH2_NO_SB_OPT = NULL;
__maybe_unused static const member_opt_get_fn	BCH2_NO_MEMBER_OPT = NULL;
__maybe_unused static const member_opt_set_fn	SET_BCH2_NO_MEMBER_OPT = NULL;

#define type_compatible_or_null(_p, _type)				\
	__builtin_choose_expr(						\
		__builtin_types_compatible_p(typeof(_p), typeof(_type)), _p, NULL)

const struct bch_option bch2_opt_table[] = {
#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) - 1, \
				.choices = _choices
#define OPT_STR_NOLIMIT(_choices)	.type = BCH_OPT_STR,		\
				.min = 0, .max = U64_MAX,		\
				.choices = _choices
#define OPT_BITFIELD(_choices)	.type = BCH_OPT_BITFIELD,		\
				.choices = _choices
#define OPT_FN(_fn)		.type = BCH_OPT_FN, .fn	= _fn

#define x(_name, _bits, _flags, _type, _sb_opt, _default, _hint, _help)	\
	[Opt_##_name] = {						\
		.attr.name	= #_name,				\
		.attr.mode	= (_flags) & OPT_RUNTIME ? 0644 : 0444,	\
		.flags		= _flags,				\
		.hint		= _hint,				\
		.help		= _help,				\
		.get_sb		= type_compatible_or_null(_sb_opt,	*BCH2_NO_SB_OPT),	\
		.set_sb		= type_compatible_or_null(SET_##_sb_opt,*SET_BCH2_NO_SB_OPT),	\
		.get_member	= type_compatible_or_null(_sb_opt,	*BCH2_NO_MEMBER_OPT),	\
		.set_member	= type_compatible_or_null(SET_##_sb_opt,*SET_BCH2_NO_MEMBER_OPT),\
		_type							\
	},

	BCH_OPTS()
#undef x
};

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;
}

struct opt_synonym {
	const char	*s1, *s2;
};

static const struct opt_synonym bch2_opt_synonyms[] = {
	{ "quota",	"usrquota" },
};

static int bch2_mount_opt_lookup(const char *name)
{
	const struct opt_synonym *i;

	for (i = bch2_opt_synonyms;
	     i < bch2_opt_synonyms + ARRAY_SIZE(bch2_opt_synonyms);
	     i++)
		if (!strcmp(name, i->s1))
			name = i->s2;

	return bch2_opt_lookup(name);
}

struct opt_val_synonym {
	const char	*opt, *v1, *v2;
};

static const struct opt_val_synonym bch2_opt_val_synonyms[] = {
	{ "degraded",	"true",		"yes" },
	{ "degraded",	"false",	"no"  },
	{ "degraded",	"1",		"yes" },
	{ "degraded",	"0",		"no"  },
};

static const char *bch2_opt_val_synonym_lookup(const char *opt, const char *val)
{
	const struct opt_val_synonym *i;

	for (i = bch2_opt_val_synonyms;
	     i < bch2_opt_val_synonyms + ARRAY_SIZE(bch2_opt_val_synonyms);
	     i++)
		if (!strcmp(opt, i->opt) && !strcmp(val, i->v1))
			return i->v2;

	return val;
}

int bch2_opt_validate(const struct bch_option *opt, u64 v, struct printbuf *err)
{
	if (v < opt->min) {
		if (err)
			prt_printf(err, "%s: too small (min %llu)",
			       opt->attr.name, opt->min);
		return -BCH_ERR_ERANGE_option_too_small;
	}

	if (opt->max && v >= opt->max) {
		if (err)
			prt_printf(err, "%s: too big (max %llu)",
			       opt->attr.name, opt->max);
		return -BCH_ERR_ERANGE_option_too_big;
	}

	if ((opt->flags & OPT_SB_FIELD_SECTORS) && (v & 511)) {
		if (err)
			prt_printf(err, "%s: not a multiple of 512",
			       opt->attr.name);
		return -BCH_ERR_opt_parse_error;
	}

	if ((opt->flags & OPT_MUST_BE_POW_2) && !is_power_of_2(v)) {
		if (err)
			prt_printf(err, "%s: must be a power of two",
			       opt->attr.name);
		return -BCH_ERR_opt_parse_error;
	}

	if (opt->fn.validate)
		return opt->fn.validate(v, err);

	return 0;
}

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

	if (err)
		printbuf_indent_add_nextline(err, 2);

	switch (opt->type) {
	case BCH_OPT_BOOL:
		if (!val)
			val = "1";

		ret = lookup_constant(bool_names, val, -BCH_ERR_option_not_bool);
		if (ret != -BCH_ERR_option_not_bool) {
			*res = ret;
		} else {
			if (err)
				prt_printf(err, "%s: must be bool", opt->attr.name);
			return ret;
		}
		break;
	case BCH_OPT_UINT:
		if (!val) {
			prt_printf(err, "%s: required value",
				   opt->attr.name);
			return -EINVAL;
		}

		if (*val != '-') {
			ret = opt->flags & OPT_HUMAN_READABLE
			    ? bch2_strtou64_h(val, res)
			    : kstrtou64(val, 10, res);
		} else {
			prt_printf(err, "%s: must be a non-negative number", opt->attr.name);
			return -BCH_ERR_option_negative;
		}

		if (ret < 0) {
			if (err)
				prt_printf(err, "%s: must be a number",
					   opt->attr.name);
			return ret;
		}
		break;
	case BCH_OPT_STR:
		if (!val) {
			prt_printf(err, "%s: required value",
				   opt->attr.name);
			return -EINVAL;
		}

		ret = match_string(opt->choices, -1, val);
		if (ret < 0) {
			if (err)
				prt_printf(err, "%s: invalid selection",
					   opt->attr.name);
			return ret;
		}

		*res = ret;
		break;
	case BCH_OPT_BITFIELD: {
		s64 v = bch2_read_flag_list(val, opt->choices);
		if (v < 0)
			return v;
		*res = v;
		break;
	}
	case BCH_OPT_FN:
		ret = opt->fn.parse(c, val, res, err);

		if (ret == -BCH_ERR_option_needs_open_fs)
			return ret;

		if (ret < 0) {
			if (err)
				prt_printf(err, "%s: parse error",
					   opt->attr.name);
			return ret;
		}
	}

	return bch2_opt_validate(opt, *res, err);
}

void bch2_opt_to_text(struct printbuf *out,
		      struct bch_fs *c, struct bch_sb *sb,
		      const struct bch_option *opt, u64 v,
		      unsigned flags)
{
	if (flags & OPT_SHOW_MOUNT_STYLE) {
		if (opt->type == BCH_OPT_BOOL) {
			prt_printf(out, "%s%s",
			       v ? "" : "no",
			       opt->attr.name);
			return;
		}

		prt_printf(out, "%s=", opt->attr.name);
	}

	switch (opt->type) {
	case BCH_OPT_BOOL:
	case BCH_OPT_UINT:
		if (opt->flags & OPT_HUMAN_READABLE)
			prt_human_readable_u64(out, v);
		else
			prt_printf(out, "%lli", v);
		break;
	case BCH_OPT_STR:
		if (v < opt->min || v >= opt->max)
			prt_printf(out, "(invalid option %lli)", v);
		else if (flags & OPT_SHOW_FULL_LIST)
			prt_string_option(out, opt->choices, v);
		else
			prt_str(out, opt->choices[v]);
		break;
	case BCH_OPT_BITFIELD:
		prt_bitflags(out, opt->choices, v);
		break;
	case BCH_OPT_FN:
		opt->fn.to_text(out, c, sb, v);
		break;
	default:
		BUG();
	}
}

void bch2_opts_to_text(struct printbuf *out,
		       struct bch_opts opts,
		       struct bch_fs *c, struct bch_sb *sb,
		       unsigned show_mask, unsigned hide_mask,
		       unsigned flags)
{
	bool first = true;

	for (enum bch_opt_id i = 0; i < bch2_opts_nr; i++) {
		const struct bch_option *opt = &bch2_opt_table[i];

		if ((opt->flags & hide_mask) || !(opt->flags & show_mask))
			continue;

		u64 v = bch2_opt_get_by_id(&opts, i);
		if (v == bch2_opt_get_by_id(&bch2_opts_default, i))
			continue;

		if (!first)
			prt_char(out, ',');
		first = false;

		bch2_opt_to_text(out, c, sb, opt, v, flags);
	}
}

int bch2_opt_hook_pre_set(struct bch_fs *c, struct bch_dev *ca, enum bch_opt_id id, u64 v)
{
	int ret = 0;

	switch (id) {
	case Opt_state:
		if (ca)
			return bch2_dev_set_state(c, ca, v, BCH_FORCE_IF_DEGRADED);
		break;

	case Opt_compression:
	case Opt_background_compression:
		ret = bch2_check_set_has_compressed_data(c, v);
		break;
	case Opt_erasure_code:
		if (v)
			bch2_check_set_feature(c, BCH_FEATURE_ec);
		break;
	default:
		break;
	}

	return ret;
}

int bch2_opts_hooks_pre_set(struct bch_fs *c)
{
	for (unsigned i = 0; i < bch2_opts_nr; i++) {
		int ret = bch2_opt_hook_pre_set(c, NULL, i, bch2_opt_get_by_id(&c->opts, i));
		if (ret)
			return ret;
	}

	return 0;
}

void bch2_opt_hook_post_set(struct bch_fs *c, struct bch_dev *ca, u64 inum,
			    struct bch_opts *new_opts, enum bch_opt_id id)
{
	switch (id) {
	case Opt_foreground_target:
		if (new_opts->foreground_target &&
		    !new_opts->background_target)
			bch2_set_rebalance_needs_scan(c, inum);
		break;
	case Opt_compression:
		if (new_opts->compression &&
		    !new_opts->background_compression)
			bch2_set_rebalance_needs_scan(c, inum);
		break;
	case Opt_background_target:
		if (new_opts->background_target)
			bch2_set_rebalance_needs_scan(c, inum);
		break;
	case Opt_background_compression:
		if (new_opts->background_compression)
			bch2_set_rebalance_needs_scan(c, inum);
		break;
	case Opt_rebalance_enabled:
		bch2_rebalance_wakeup(c);
		break;
	case Opt_copygc_enabled:
		bch2_copygc_wakeup(c);
		break;
	case Opt_discard:
		if (!ca) {
			mutex_lock(&c->sb_lock);
			for_each_member_device(c, ca) {
				struct bch_member *m =
					bch2_members_v2_get_mut(ca->disk_sb.sb, ca->dev_idx);
				SET_BCH_MEMBER_DISCARD(m, c->opts.discard);
			}

			bch2_write_super(c);
			mutex_unlock(&c->sb_lock);
		}
		break;
	case Opt_version_upgrade:
		/*
		 * XXX: in the future we'll likely want to do compatible
		 * upgrades at runtime as well, but right now there's nothing
		 * that does that:
		 */
		if (new_opts->version_upgrade == BCH_VERSION_UPGRADE_incompatible)
			bch2_sb_upgrade_incompat(c);
		break;
	default:
		break;
	}
}

int bch2_parse_one_mount_opt(struct bch_fs *c, struct bch_opts *opts,
			     struct printbuf *parse_later,
			     const char *name, const char *val)
{
	struct printbuf err = PRINTBUF;
	u64 v;
	int ret, id;

	id = bch2_mount_opt_lookup(name);

	/* Check for the form "noopt", negation of a boolean opt: */
	if (id < 0 &&
	    !val &&
	    !strncmp("no", name, 2)) {
		id = bch2_mount_opt_lookup(name + 2);
		val = "0";
	}

	/* Unknown options are ignored: */
	if (id < 0)
		return 0;

	/* must have a value for synonym lookup - but OPT_FN is weird */
	if (!val && bch2_opt_table[id].type != BCH_OPT_FN)
		val = "1";

	val = bch2_opt_val_synonym_lookup(name, val);

	if (!(bch2_opt_table[id].flags & OPT_MOUNT))
		goto bad_opt;

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

	if ((id == Opt_usrquota ||
	     id == Opt_grpquota) &&
	    !IS_ENABLED(CONFIG_BCACHEFS_QUOTA))
		goto bad_opt;

	ret = bch2_opt_parse(c, &bch2_opt_table[id], val, &v, &err);
	if (ret == -BCH_ERR_option_needs_open_fs) {
		ret = 0;

		if (parse_later) {
			prt_printf(parse_later, "%s=%s,", name, val);
			if (parse_later->allocation_failure)
				ret = -ENOMEM;
		}

		goto out;
	}

	if (ret < 0)
		goto bad_val;

	if (opts)
		bch2_opt_set_by_id(opts, id, v);

	ret = 0;
out:
	printbuf_exit(&err);
	return ret;
bad_opt:
	ret = -BCH_ERR_option_name;
	goto out;
bad_val:
	ret = -BCH_ERR_option_value;
	goto out;
}

int bch2_parse_mount_opts(struct bch_fs *c, struct bch_opts *opts,
			  struct printbuf *parse_later, char *options,
			  bool ignore_unknown)
{
	char *copied_opts, *copied_opts_start;
	char *opt, *name, *val;
	int ret = 0;

	if (!options)
		return 0;

	/*
	 * sys_fsconfig() is now occasionally providing us with option lists
	 * starting with a comma - weird.
	 */
	if (*options == ',')
		options++;

	copied_opts = kstrdup(options, GFP_KERNEL);
	if (!copied_opts)
		return -ENOMEM;
	copied_opts_start = copied_opts;

	while ((opt = strsep(&copied_opts, ",")) != NULL) {
		if (!*opt)
			continue;

		name	= strsep(&opt, "=");
		val	= opt;

		ret = bch2_parse_one_mount_opt(c, opts, parse_later, name, val);
		if (ret == -BCH_ERR_option_name && ignore_unknown)
			ret = 0;
		if (ret) {
			pr_err("Error parsing option %s: %s", name, bch2_err_str(ret));
			break;
		}
	}

	kfree(copied_opts_start);
	return ret;
}

u64 bch2_opt_from_sb(struct bch_sb *sb, enum bch_opt_id id, int dev_idx)
{
	const struct bch_option *opt = bch2_opt_table + id;
	u64 v;

	if (dev_idx < 0) {
		v = opt->get_sb(sb);
	} else {
		if (WARN(!bch2_member_exists(sb, dev_idx),
			 "tried to set device option %s on nonexistent device %i",
			 opt->attr.name, dev_idx))
			return 0;

		struct bch_member m = bch2_sb_member_get(sb, dev_idx);
		v = opt->get_member(&m);
	}

	if (opt->flags & OPT_SB_FIELD_ONE_BIAS)
		--v;

	if (opt->flags & OPT_SB_FIELD_ILOG2)
		v = 1ULL << v;

	if (opt->flags & OPT_SB_FIELD_SECTORS)
		v <<= 9;

	return v;
}

/*
 * 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)
{
	for (unsigned id = 0; id < bch2_opts_nr; id++) {
		const struct bch_option *opt = bch2_opt_table + id;

		if (opt->get_sb)
			bch2_opt_set_by_id(opts, id, bch2_opt_from_sb(sb, id, -1));
	}

	return 0;
}

bool __bch2_opt_set_sb(struct bch_sb *sb, int dev_idx,
		       const struct bch_option *opt, u64 v)
{
	bool changed = false;

	if (opt->flags & OPT_SB_FIELD_SECTORS)
		v >>= 9;

	if (opt->flags & OPT_SB_FIELD_ILOG2)
		v = ilog2(v);

	if (opt->flags & OPT_SB_FIELD_ONE_BIAS)
		v++;

	if ((opt->flags & OPT_FS) && opt->set_sb && dev_idx < 0) {
		changed = v != opt->get_sb(sb);

		opt->set_sb(sb, v);
	}

	if ((opt->flags & OPT_DEVICE) && opt->set_member && dev_idx >= 0) {
		if (WARN(!bch2_member_exists(sb, dev_idx),
			 "tried to set device option %s on nonexistent device %i",
			 opt->attr.name, dev_idx))
			return false;

		struct bch_member *m = bch2_members_v2_get_mut(sb, dev_idx);
		changed = v != opt->get_member(m);
		opt->set_member(m, v);
	}

	return changed;
}

bool bch2_opt_set_sb(struct bch_fs *c, struct bch_dev *ca,
		     const struct bch_option *opt, u64 v)
{
	mutex_lock(&c->sb_lock);
	bool changed = __bch2_opt_set_sb(c->disk_sb.sb, ca ? ca->dev_idx : -1, opt, v);
	if (changed)
		bch2_write_super(c);
	mutex_unlock(&c->sb_lock);
	return changed;
}

/* io opts: */

struct bch_io_opts bch2_opts_to_inode_opts(struct bch_opts src)
{
	struct bch_io_opts opts = {
#define x(_name, _bits)	._name = src._name,
	BCH_INODE_OPTS()
#undef x
	};

	bch2_io_opts_fixups(&opts);
	return opts;
}

bool bch2_opt_is_inode_opt(enum bch_opt_id id)
{
	static const enum bch_opt_id inode_opt_list[] = {
#define x(_name, _bits)	Opt_##_name,
	BCH_INODE_OPTS()
#undef x
	};
	unsigned i;

	for (i = 0; i < ARRAY_SIZE(inode_opt_list); i++)
		if (inode_opt_list[i] == id)
			return true;

	return false;
}
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0
	2
	3	#include <linux/kernel.h>
	4	#include <linux/fs_parser.h>
	5
	6	#include "bcachefs.h"
	7	#include "compress.h"
	8	#include "disk_groups.h"
	9	#include "error.h"
	10	#include "movinggc.h"
	11	#include "opts.h"
	12	#include "rebalance.h"
	13	#include "recovery_passes.h"
	14	#include "super-io.h"
	15	#include "util.h"
	16
	17	#define x(t, n, ...) [n] = #t,
	18
	19	const char * const bch2_error_actions[] = {
	20	BCH_ERROR_ACTIONS()
	21	NULL
	22	};
	23
	24	const char * const bch2_degraded_actions[] = {
	25	BCH_DEGRADED_ACTIONS()
	26	NULL
	27	};
	28
	29	const char * const bch2_fsck_fix_opts[] = {
	30	BCH_FIX_ERRORS_OPTS()
	31	NULL
	32	};
	33
	34	const char * const bch2_version_upgrade_opts[] = {
	35	BCH_VERSION_UPGRADE_OPTS()
	36	NULL
	37	};
	38
	39	const char * const bch2_sb_features[] = {
	40	BCH_SB_FEATURES()
	41	NULL
	42	};
	43
	44	const char * const bch2_sb_compat[] = {
	45	BCH_SB_COMPAT()
	46	NULL
	47	};
	48
	49	const char * const __bch2_btree_ids[] = {
	50	BCH_BTREE_IDS()
	51	NULL
	52	};
	53
	54	const char * const __bch2_csum_types[] = {
	55	BCH_CSUM_TYPES()
	56	NULL
	57	};
	58
	59	const char * const __bch2_csum_opts[] = {
	60	BCH_CSUM_OPTS()
	61	NULL
	62	};
	63
	64	const char * const __bch2_compression_types[] = {
	65	BCH_COMPRESSION_TYPES()
	66	NULL
	67	};
	68
	69	const char * const bch2_compression_opts[] = {
	70	BCH_COMPRESSION_OPTS()
	71	NULL
	72	};
	73
	74	const char * const __bch2_str_hash_types[] = {
	75	BCH_STR_HASH_TYPES()
	76	NULL
	77	};
	78
	79	const char * const bch2_str_hash_opts[] = {
	80	BCH_STR_HASH_OPTS()
	81	NULL
	82	};
	83
	84	const char * const __bch2_data_types[] = {
	85	BCH_DATA_TYPES()
	86	NULL
	87	};
	88
	89	const char * const bch2_member_states[] = {
	90	BCH_MEMBER_STATES()
	91	NULL
	92	};
	93
	94	static const char * const __bch2_jset_entry_types[] = {
	95	BCH_JSET_ENTRY_TYPES()
	96	NULL
	97	};
	98
	99	static const char * const __bch2_fs_usage_types[] = {
	100	BCH_FS_USAGE_TYPES()
	101	NULL
	102	};
	103
	104	#undef x
	105
	106	static void prt_str_opt_boundscheck(struct printbuf out, const char const opts[],
	107	unsigned nr, const char *type, unsigned idx)
	108	{
	109	if (idx < nr)
	110	prt_str(out, opts[idx]);
	111	else
	112	prt_printf(out, "(unknown %s %u)", type, idx);
	113	}
	114
	115	#define PRT_STR_OPT_BOUNDSCHECKED(name, type) \
	116	void bch2_prt_##name(struct printbuf *out, type t) \
	117	{ \
	118	prt_str_opt_boundscheck(out, __bch2_##name##s, ARRAY_SIZE(__bch2_##name##s) - 1, #name, t);\
	119	}
	120
	121	PRT_STR_OPT_BOUNDSCHECKED(jset_entry_type, enum bch_jset_entry_type);
	122	PRT_STR_OPT_BOUNDSCHECKED(fs_usage_type, enum bch_fs_usage_type);
	123	PRT_STR_OPT_BOUNDSCHECKED(data_type, enum bch_data_type);
	124	PRT_STR_OPT_BOUNDSCHECKED(csum_opt, enum bch_csum_opt);
	125	PRT_STR_OPT_BOUNDSCHECKED(csum_type, enum bch_csum_type);
	126	PRT_STR_OPT_BOUNDSCHECKED(compression_type, enum bch_compression_type);
	127	PRT_STR_OPT_BOUNDSCHECKED(str_hash_type, enum bch_str_hash_type);
	128
	129	static int bch2_opt_fix_errors_parse(struct bch_fs c, const char val, u64 *res,
	130	struct printbuf *err)
	131	{
	132	if (!val) {
	133	*res = FSCK_FIX_yes;
	134	} else {
	135	int ret = match_string(bch2_fsck_fix_opts, -1, val);
	136
	137	if (ret < 0 && err)
	138	prt_str(err, "fix_errors: invalid selection");
	139	if (ret < 0)
	140	return ret;
	141	*res = ret;
	142	}
	143
	144	return 0;
	145	}
	146
	147	static void bch2_opt_fix_errors_to_text(struct printbuf *out,
	148	struct bch_fs *c,
	149	struct bch_sb *sb,
	150	u64 v)
	151	{
	152	prt_str(out, bch2_fsck_fix_opts[v]);
	153	}
	154
	155	#define bch2_opt_fix_errors (struct bch_opt_fn) { \
	156	.parse = bch2_opt_fix_errors_parse, \
	157	.to_text = bch2_opt_fix_errors_to_text, \
	158	}
	159
	160	const char * const bch2_d_types[BCH_DT_MAX] = {
	161	[DT_UNKNOWN] = "unknown",
	162	[DT_FIFO] = "fifo",
	163	[DT_CHR] = "chr",
	164	[DT_DIR] = "dir",
	165	[DT_BLK] = "blk",
	166	[DT_REG] = "reg",
	167	[DT_LNK] = "lnk",
	168	[DT_SOCK] = "sock",
	169	[DT_WHT] = "whiteout",
	170	[DT_SUBVOL] = "subvol",
	171	};
	172
	173	void bch2_opts_apply(struct bch_opts *dst, struct bch_opts src)
	174	{
	175	#define x(_name, ...) \
	176	if (opt_defined(src, _name)) \
	177	opt_set(*dst, _name, src._name);
	178
	179	BCH_OPTS()
	180	#undef x
	181	}
	182
	183	bool bch2_opt_defined_by_id(const struct bch_opts *opts, enum bch_opt_id id)
	184	{
	185	switch (id) {
	186	#define x(_name, ...) \
	187	case Opt_##_name: \
	188	return opt_defined(*opts, _name);
	189	BCH_OPTS()
	190	#undef x
	191	default:
	192	BUG();
	193	}
	194	}
	195
	196	u64 bch2_opt_get_by_id(const struct bch_opts *opts, enum bch_opt_id id)
	197	{
	198	switch (id) {
	199	#define x(_name, ...) \
	200	case Opt_##_name: \
	201	return opts->_name;
	202	BCH_OPTS()
	203	#undef x
	204	default:
	205	BUG();
	206	}
	207	}
	208
	209	void bch2_opt_set_by_id(struct bch_opts *opts, enum bch_opt_id id, u64 v)
	210	{
	211	switch (id) {
	212	#define x(_name, ...) \
	213	case Opt_##_name: \
	214	opt_set(*opts, _name, v); \
	215	break;
	216	BCH_OPTS()
	217	#undef x
	218	default:
	219	BUG();
	220	}
	221	}
	222
	223	/* dummy option, for options that aren't stored in the superblock */
	224	typedef u64 (sb_opt_get_fn)(const struct bch_sb );
	225	typedef void (sb_opt_set_fn)(struct bch_sb , u64);
	226	typedef u64 (member_opt_get_fn)(const struct bch_member );
	227	typedef void (member_opt_set_fn)(struct bch_member , u64);
	228
	229	__maybe_unused static const sb_opt_get_fn BCH2_NO_SB_OPT = NULL;
	230	__maybe_unused static const sb_opt_set_fn SET_BCH2_NO_SB_OPT = NULL;
	231	__maybe_unused static const member_opt_get_fn BCH2_NO_MEMBER_OPT = NULL;
	232	__maybe_unused static const member_opt_set_fn SET_BCH2_NO_MEMBER_OPT = NULL;
	233
	234	#define type_compatible_or_null(_p, _type) \
	235	__builtin_choose_expr( \
	236	__builtin_types_compatible_p(typeof(_p), typeof(_type)), _p, NULL)
	237
	238	const struct bch_option bch2_opt_table[] = {
	239	#define OPT_BOOL() .type = BCH_OPT_BOOL, .min = 0, .max = 2
	240	#define OPT_UINT(_min, _max) .type = BCH_OPT_UINT, \
	241	.min = _min, .max = _max
	242	#define OPT_STR(_choices) .type = BCH_OPT_STR, \
	243	.min = 0, .max = ARRAY_SIZE(_choices) - 1, \
	244	.choices = _choices
	245	#define OPT_STR_NOLIMIT(_choices) .type = BCH_OPT_STR, \
	246	.min = 0, .max = U64_MAX, \
	247	.choices = _choices
	248	#define OPT_BITFIELD(_choices) .type = BCH_OPT_BITFIELD, \
	249	.choices = _choices
	250	#define OPT_FN(_fn) .type = BCH_OPT_FN, .fn = _fn
	251
	252	#define x(_name, _bits, _flags, _type, _sb_opt, _default, _hint, _help) \
	253	[Opt_##_name] = { \
	254	.attr.name = #_name, \
	255	.attr.mode = (_flags) & OPT_RUNTIME ? 0644 : 0444, \
	256	.flags = _flags, \
	257	.hint = _hint, \
	258	.help = _help, \
	259	.get_sb = type_compatible_or_null(_sb_opt, *BCH2_NO_SB_OPT), \
	260	.set_sb = type_compatible_or_null(SET_##_sb_opt,*SET_BCH2_NO_SB_OPT), \
	261	.get_member = type_compatible_or_null(_sb_opt, *BCH2_NO_MEMBER_OPT), \
	262	.set_member = type_compatible_or_null(SET_##_sb_opt,*SET_BCH2_NO_MEMBER_OPT),\
	263	_type \
	264	},
	265
	266	BCH_OPTS()
	267	#undef x
	268	};
	269
	270	int bch2_opt_lookup(const char *name)
	271	{
	272	const struct bch_option *i;
	273
	274	for (i = bch2_opt_table;
	275	i < bch2_opt_table + ARRAY_SIZE(bch2_opt_table);
	276	i++)
	277	if (!strcmp(name, i->attr.name))
	278	return i - bch2_opt_table;
	279
	280	return -1;
	281	}
	282
	283	struct opt_synonym {
	284	const char s1, s2;
	285	};
	286
	287	static const struct opt_synonym bch2_opt_synonyms[] = {
	288	{ "quota", "usrquota" },
	289	};
	290
	291	static int bch2_mount_opt_lookup(const char *name)
	292	{
	293	const struct opt_synonym *i;
	294
	295	for (i = bch2_opt_synonyms;
	296	i < bch2_opt_synonyms + ARRAY_SIZE(bch2_opt_synonyms);
	297	i++)
	298	if (!strcmp(name, i->s1))
	299	name = i->s2;
	300
	301	return bch2_opt_lookup(name);
	302	}
	303
	304	struct opt_val_synonym {
	305	const char opt, v1, *v2;
	306	};
	307
	308	static const struct opt_val_synonym bch2_opt_val_synonyms[] = {
	309	{ "degraded", "true", "yes" },
	310	{ "degraded", "false", "no" },
	311	{ "degraded", "1", "yes" },
	312	{ "degraded", "0", "no" },
	313	};
	314
	315	static const char bch2_opt_val_synonym_lookup(const char opt, const char *val)
	316	{
	317	const struct opt_val_synonym *i;
	318
	319	for (i = bch2_opt_val_synonyms;
	320	i < bch2_opt_val_synonyms + ARRAY_SIZE(bch2_opt_val_synonyms);
	321	i++)
	322	if (!strcmp(opt, i->opt) && !strcmp(val, i->v1))
	323	return i->v2;
	324
	325	return val;
	326	}
	327
	328	int bch2_opt_validate(const struct bch_option opt, u64 v, struct printbuf err)
	329	{
	330	if (v < opt->min) {
	331	if (err)
	332	prt_printf(err, "%s: too small (min %llu)",
	333	opt->attr.name, opt->min);
	334	return -BCH_ERR_ERANGE_option_too_small;
	335	}
	336
	337	if (opt->max && v >= opt->max) {
	338	if (err)
	339	prt_printf(err, "%s: too big (max %llu)",
	340	opt->attr.name, opt->max);
	341	return -BCH_ERR_ERANGE_option_too_big;
	342	}
	343
	344	if ((opt->flags & OPT_SB_FIELD_SECTORS) && (v & 511)) {
	345	if (err)
	346	prt_printf(err, "%s: not a multiple of 512",
	347	opt->attr.name);
	348	return -BCH_ERR_opt_parse_error;
	349	}
	350
	351	if ((opt->flags & OPT_MUST_BE_POW_2) && !is_power_of_2(v)) {
	352	if (err)
	353	prt_printf(err, "%s: must be a power of two",
	354	opt->attr.name);
	355	return -BCH_ERR_opt_parse_error;
	356	}
	357
	358	if (opt->fn.validate)
	359	return opt->fn.validate(v, err);
	360
	361	return 0;
	362	}
	363
	364	int bch2_opt_parse(struct bch_fs *c,
	365	const struct bch_option *opt,
	366	const char val, u64 res,
	367	struct printbuf *err)
	368	{
	369	ssize_t ret;
	370
	371	if (err)
	372	printbuf_indent_add_nextline(err, 2);
	373
	374	switch (opt->type) {
	375	case BCH_OPT_BOOL:
	376	if (!val)
	377	val = "1";
	378
	379	ret = lookup_constant(bool_names, val, -BCH_ERR_option_not_bool);
	380	if (ret != -BCH_ERR_option_not_bool) {
	381	*res = ret;
	382	} else {
	383	if (err)
	384	prt_printf(err, "%s: must be bool", opt->attr.name);
	385	return ret;
	386	}
	387	break;
	388	case BCH_OPT_UINT:
	389	if (!val) {
	390	prt_printf(err, "%s: required value",
	391	opt->attr.name);
	392	return -EINVAL;
	393	}
	394
	395	if (*val != '-') {
	396	ret = opt->flags & OPT_HUMAN_READABLE
	397	? bch2_strtou64_h(val, res)
	398	: kstrtou64(val, 10, res);
	399	} else {
	400	prt_printf(err, "%s: must be a non-negative number", opt->attr.name);
	401	return -BCH_ERR_option_negative;
	402	}
	403
	404	if (ret < 0) {
	405	if (err)
	406	prt_printf(err, "%s: must be a number",
	407	opt->attr.name);
	408	return ret;
	409	}
	410	break;
	411	case BCH_OPT_STR:
	412	if (!val) {
	413	prt_printf(err, "%s: required value",
	414	opt->attr.name);
	415	return -EINVAL;
	416	}
	417
	418	ret = match_string(opt->choices, -1, val);
	419	if (ret < 0) {
	420	if (err)
	421	prt_printf(err, "%s: invalid selection",
	422	opt->attr.name);
	423	return ret;
	424	}
	425
	426	*res = ret;
	427	break;
	428	case BCH_OPT_BITFIELD: {
	429	s64 v = bch2_read_flag_list(val, opt->choices);
	430	if (v < 0)
	431	return v;
	432	*res = v;
	433	break;
	434	}
	435	case BCH_OPT_FN:
	436	ret = opt->fn.parse(c, val, res, err);
	437
	438	if (ret == -BCH_ERR_option_needs_open_fs)
	439	return ret;
	440
	441	if (ret < 0) {
	442	if (err)
	443	prt_printf(err, "%s: parse error",
	444	opt->attr.name);
	445	return ret;
	446	}
	447	}
	448
	449	return bch2_opt_validate(opt, *res, err);
	450	}
	451
	452	void bch2_opt_to_text(struct printbuf *out,
	453	struct bch_fs c, struct bch_sb sb,
	454	const struct bch_option *opt, u64 v,
	455	unsigned flags)
	456	{
	457	if (flags & OPT_SHOW_MOUNT_STYLE) {
	458	if (opt->type == BCH_OPT_BOOL) {
	459	prt_printf(out, "%s%s",
	460	v ? "" : "no",
	461	opt->attr.name);
	462	return;
	463	}
	464
	465	prt_printf(out, "%s=", opt->attr.name);
	466	}
	467
	468	switch (opt->type) {
	469	case BCH_OPT_BOOL:
	470	case BCH_OPT_UINT:
	471	if (opt->flags & OPT_HUMAN_READABLE)
	472	prt_human_readable_u64(out, v);
	473	else
	474	prt_printf(out, "%lli", v);
	475	break;
	476	case BCH_OPT_STR:
	477	if (v < opt->min \|\| v >= opt->max)
	478	prt_printf(out, "(invalid option %lli)", v);
	479	else if (flags & OPT_SHOW_FULL_LIST)
	480	prt_string_option(out, opt->choices, v);
	481	else
	482	prt_str(out, opt->choices[v]);
	483	break;
	484	case BCH_OPT_BITFIELD:
	485	prt_bitflags(out, opt->choices, v);
	486	break;
	487	case BCH_OPT_FN:
	488	opt->fn.to_text(out, c, sb, v);
	489	break;
	490	default:
	491	BUG();
	492	}
	493	}
	494
	495	void bch2_opts_to_text(struct printbuf *out,
	496	struct bch_opts opts,
	497	struct bch_fs c, struct bch_sb sb,
	498	unsigned show_mask, unsigned hide_mask,
	499	unsigned flags)
	500	{
	501	bool first = true;
	502
	503	for (enum bch_opt_id i = 0; i < bch2_opts_nr; i++) {
	504	const struct bch_option *opt = &bch2_opt_table[i];
	505
	506	if ((opt->flags & hide_mask) \|\| !(opt->flags & show_mask))
	507	continue;
	508
	509	u64 v = bch2_opt_get_by_id(&opts, i);
	510	if (v == bch2_opt_get_by_id(&bch2_opts_default, i))
	511	continue;
	512
	513	if (!first)
	514	prt_char(out, ',');
	515	first = false;
	516
	517	bch2_opt_to_text(out, c, sb, opt, v, flags);
	518	}
	519	}
	520
	521	int bch2_opt_hook_pre_set(struct bch_fs c, struct bch_dev ca, enum bch_opt_id id, u64 v)
	522	{
	523	int ret = 0;
	524
	525	switch (id) {
	526	case Opt_state:
	527	if (ca)
	528	return bch2_dev_set_state(c, ca, v, BCH_FORCE_IF_DEGRADED);
	529	break;
	530
	531	case Opt_compression:
	532	case Opt_background_compression:
	533	ret = bch2_check_set_has_compressed_data(c, v);
	534	break;
	535	case Opt_erasure_code:
	536	if (v)
	537	bch2_check_set_feature(c, BCH_FEATURE_ec);
	538	break;
	539	default:
	540	break;
	541	}
	542
	543	return ret;
	544	}
	545
	546	int bch2_opts_hooks_pre_set(struct bch_fs *c)
	547	{
	548	for (unsigned i = 0; i < bch2_opts_nr; i++) {
	549	int ret = bch2_opt_hook_pre_set(c, NULL, i, bch2_opt_get_by_id(&c->opts, i));
	550	if (ret)
	551	return ret;
	552	}
	553
	554	return 0;
	555	}
	556
	557	void bch2_opt_hook_post_set(struct bch_fs c, struct bch_dev ca, u64 inum,
	558	struct bch_opts *new_opts, enum bch_opt_id id)
	559	{
	560	switch (id) {
	561	case Opt_foreground_target:
	562	if (new_opts->foreground_target &&
	563	!new_opts->background_target)
	564	bch2_set_rebalance_needs_scan(c, inum);
	565	break;
	566	case Opt_compression:
	567	if (new_opts->compression &&
	568	!new_opts->background_compression)
	569	bch2_set_rebalance_needs_scan(c, inum);
	570	break;
	571	case Opt_background_target:
	572	if (new_opts->background_target)
	573	bch2_set_rebalance_needs_scan(c, inum);
	574	break;
	575	case Opt_background_compression:
	576	if (new_opts->background_compression)
	577	bch2_set_rebalance_needs_scan(c, inum);
	578	break;
	579	case Opt_rebalance_enabled:
	580	bch2_rebalance_wakeup(c);
	581	break;
	582	case Opt_copygc_enabled:
	583	bch2_copygc_wakeup(c);
	584	break;
	585	case Opt_discard:
	586	if (!ca) {
	587	mutex_lock(&c->sb_lock);
	588	for_each_member_device(c, ca) {
	589	struct bch_member *m =
	590	bch2_members_v2_get_mut(ca->disk_sb.sb, ca->dev_idx);
	591	SET_BCH_MEMBER_DISCARD(m, c->opts.discard);
	592	}
	593
	594	bch2_write_super(c);
	595	mutex_unlock(&c->sb_lock);
	596	}
	597	break;
	598	case Opt_version_upgrade:
	599	/*
	600	* XXX: in the future we'll likely want to do compatible
	601	* upgrades at runtime as well, but right now there's nothing
	602	* that does that:
	603	*/
	604	if (new_opts->version_upgrade == BCH_VERSION_UPGRADE_incompatible)
	605	bch2_sb_upgrade_incompat(c);
	606	break;
	607	default:
	608	break;
	609	}
	610	}
	611
	612	int bch2_parse_one_mount_opt(struct bch_fs c, struct bch_opts opts,
	613	struct printbuf *parse_later,
	614	const char name, const char val)
	615	{
	616	struct printbuf err = PRINTBUF;
	617	u64 v;
	618	int ret, id;
	619
	620	id = bch2_mount_opt_lookup(name);
	621
	622	/* Check for the form "noopt", negation of a boolean opt: */
	623	if (id < 0 &&
	624	!val &&
	625	!strncmp("no", name, 2)) {
	626	id = bch2_mount_opt_lookup(name + 2);
	627	val = "0";
	628	}
	629
	630	/* Unknown options are ignored: */
	631	if (id < 0)
	632	return 0;
	633
	634	/* must have a value for synonym lookup - but OPT_FN is weird */
	635	if (!val && bch2_opt_table[id].type != BCH_OPT_FN)
	636	val = "1";
	637
	638	val = bch2_opt_val_synonym_lookup(name, val);
	639
	640	if (!(bch2_opt_table[id].flags & OPT_MOUNT))
	641	goto bad_opt;
	642
	643	if (id == Opt_acl &&
	644	!IS_ENABLED(CONFIG_BCACHEFS_POSIX_ACL))
	645	goto bad_opt;
	646
	647	if ((id == Opt_usrquota \|\|
	648	id == Opt_grpquota) &&
	649	!IS_ENABLED(CONFIG_BCACHEFS_QUOTA))
	650	goto bad_opt;
	651
	652	ret = bch2_opt_parse(c, &bch2_opt_table[id], val, &v, &err);
	653	if (ret == -BCH_ERR_option_needs_open_fs) {
	654	ret = 0;
	655
	656	if (parse_later) {
	657	prt_printf(parse_later, "%s=%s,", name, val);
	658	if (parse_later->allocation_failure)
	659	ret = -ENOMEM;
	660	}
	661
	662	goto out;
	663	}
	664
	665	if (ret < 0)
	666	goto bad_val;
	667
	668	if (opts)
	669	bch2_opt_set_by_id(opts, id, v);
	670
	671	ret = 0;
	672	out:
	673	printbuf_exit(&err);
	674	return ret;
	675	bad_opt:
	676	ret = -BCH_ERR_option_name;
	677	goto out;
	678	bad_val:
	679	ret = -BCH_ERR_option_value;
	680	goto out;
	681	}
	682
	683	int bch2_parse_mount_opts(struct bch_fs c, struct bch_opts opts,
	684	struct printbuf parse_later, char options,
	685	bool ignore_unknown)
	686	{
	687	char copied_opts, copied_opts_start;
	688	char opt, name, *val;
	689	int ret = 0;
	690
	691	if (!options)
	692	return 0;
	693
	694	/*
	695	* sys_fsconfig() is now occasionally providing us with option lists
	696	* starting with a comma - weird.
	697	*/
	698	if (*options == ',')
	699	options++;
	700
	701	copied_opts = kstrdup(options, GFP_KERNEL);
	702	if (!copied_opts)
	703	return -ENOMEM;
	704	copied_opts_start = copied_opts;
	705
	706	while ((opt = strsep(&copied_opts, ",")) != NULL) {
	707	if (!*opt)
	708	continue;
	709
	710	name = strsep(&opt, "=");
	711	val = opt;
	712
	713	ret = bch2_parse_one_mount_opt(c, opts, parse_later, name, val);
	714	if (ret == -BCH_ERR_option_name && ignore_unknown)
	715	ret = 0;
	716	if (ret) {
	717	pr_err("Error parsing option %s: %s", name, bch2_err_str(ret));
	718	break;
	719	}
	720	}
	721
	722	kfree(copied_opts_start);
	723	return ret;
	724	}
	725
	726	u64 bch2_opt_from_sb(struct bch_sb *sb, enum bch_opt_id id, int dev_idx)
	727	{
	728	const struct bch_option *opt = bch2_opt_table + id;
	729	u64 v;
	730
	731	if (dev_idx < 0) {
	732	v = opt->get_sb(sb);
	733	} else {
	734	if (WARN(!bch2_member_exists(sb, dev_idx),
	735	"tried to set device option %s on nonexistent device %i",
	736	opt->attr.name, dev_idx))
	737	return 0;
	738
	739	struct bch_member m = bch2_sb_member_get(sb, dev_idx);
	740	v = opt->get_member(&m);
	741	}
	742
	743	if (opt->flags & OPT_SB_FIELD_ONE_BIAS)
	744	--v;
	745
	746	if (opt->flags & OPT_SB_FIELD_ILOG2)
	747	v = 1ULL << v;
	748
	749	if (opt->flags & OPT_SB_FIELD_SECTORS)
	750	v <<= 9;
	751
	752	return v;
	753	}
	754
	755	/*
	756	* Initial options from superblock - here we don't want any options undefined,
	757	* any options the superblock doesn't specify are set to 0:
	758	*/
	759	int bch2_opts_from_sb(struct bch_opts opts, struct bch_sb sb)
	760	{
	761	for (unsigned id = 0; id < bch2_opts_nr; id++) {
	762	const struct bch_option *opt = bch2_opt_table + id;
	763
	764	if (opt->get_sb)
	765	bch2_opt_set_by_id(opts, id, bch2_opt_from_sb(sb, id, -1));
	766	}
	767
	768	return 0;
	769	}
	770
	771	bool __bch2_opt_set_sb(struct bch_sb *sb, int dev_idx,
	772	const struct bch_option *opt, u64 v)
	773	{
	774	bool changed = false;
	775
	776	if (opt->flags & OPT_SB_FIELD_SECTORS)
	777	v >>= 9;
	778
	779	if (opt->flags & OPT_SB_FIELD_ILOG2)
	780	v = ilog2(v);
	781
	782	if (opt->flags & OPT_SB_FIELD_ONE_BIAS)
	783	v++;
	784
	785	if ((opt->flags & OPT_FS) && opt->set_sb && dev_idx < 0) {
	786	changed = v != opt->get_sb(sb);
	787
	788	opt->set_sb(sb, v);
	789	}
	790
	791	if ((opt->flags & OPT_DEVICE) && opt->set_member && dev_idx >= 0) {
	792	if (WARN(!bch2_member_exists(sb, dev_idx),
	793	"tried to set device option %s on nonexistent device %i",
	794	opt->attr.name, dev_idx))
	795	return false;
	796
	797	struct bch_member *m = bch2_members_v2_get_mut(sb, dev_idx);
	798	changed = v != opt->get_member(m);
	799	opt->set_member(m, v);
	800	}
	801
	802	return changed;
	803	}
	804
	805	bool bch2_opt_set_sb(struct bch_fs c, struct bch_dev ca,
	806	const struct bch_option *opt, u64 v)
	807	{
	808	mutex_lock(&c->sb_lock);
	809	bool changed = __bch2_opt_set_sb(c->disk_sb.sb, ca ? ca->dev_idx : -1, opt, v);
	810	if (changed)
	811	bch2_write_super(c);
	812	mutex_unlock(&c->sb_lock);
	813	return changed;
	814	}
	815
	816	/* io opts: */
	817
	818	struct bch_io_opts bch2_opts_to_inode_opts(struct bch_opts src)
	819	{
	820	struct bch_io_opts opts = {
	821	#define x(_name, _bits) ._name = src._name,
	822	BCH_INODE_OPTS()
	823	#undef x
	824	};
	825
	826	bch2_io_opts_fixups(&opts);
	827	return opts;
	828	}
	829
	830	bool bch2_opt_is_inode_opt(enum bch_opt_id id)
	831	{
	832	static const enum bch_opt_id inode_opt_list[] = {
	833	#define x(_name, _bits) Opt_##_name,
	834	BCH_INODE_OPTS()
	835	#undef x
	836	};
	837	unsigned i;
	838
	839	for (i = 0; i < ARRAY_SIZE(inode_opt_list); i++)
	840	if (inode_opt_list[i] == id)
	841	return true;
	842
	843	return false;
	844	}