Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /* Filesystem parameter parser.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Written by David Howells (dhowells@redhat.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/fs_context.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/fs_parser.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/namei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) static const struct constant_table bool_names[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 	{ "0",		false },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	{ "1",		true },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 	{ "false",	false },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	{ "no",		false },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 	{ "true",	true },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	{ "yes",	true },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	{ },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) static const struct constant_table *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) __lookup_constant(const struct constant_table *tbl, const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	for ( ; tbl->name; tbl++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 		if (strcmp(name, tbl->name) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 			return tbl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  * lookup_constant - Look up a constant by name in an ordered table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  * @tbl: The table of constants to search.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38)  * @name: The name to look up.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  * @not_found: The value to return if the name is not found.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) int lookup_constant(const struct constant_table *tbl, const char *name, int not_found)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	const struct constant_table *p = __lookup_constant(tbl, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	return p ? p->value : not_found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) EXPORT_SYMBOL(lookup_constant);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) static inline bool is_flag(const struct fs_parameter_spec *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	return p->type == NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) static const struct fs_parameter_spec *fs_lookup_key(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	const struct fs_parameter_spec *desc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	struct fs_parameter *param, bool *negated)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	const struct fs_parameter_spec *p, *other = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	const char *name = param->key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	bool want_flag = param->type == fs_value_is_flag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	*negated = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	for (p = desc; p->name; p++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		if (strcmp(p->name, name) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		if (likely(is_flag(p) == want_flag))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 			return p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		other = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	if (want_flag) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		if (name[0] == 'n' && name[1] == 'o' && name[2]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 			for (p = desc; p->name; p++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 				if (strcmp(p->name, name + 2) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 					continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 				if (!(p->flags & fs_param_neg_with_no))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 					continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 				*negated = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 				return p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	return other;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86)  * fs_parse - Parse a filesystem configuration parameter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87)  * @fc: The filesystem context to log errors through.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88)  * @desc: The parameter description to use.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89)  * @param: The parameter.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90)  * @result: Where to place the result of the parse
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92)  * Parse a filesystem configuration parameter and attempt a conversion for a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93)  * simple parameter for which this is requested.  If successful, the determined
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94)  * parameter ID is placed into @result->key, the desired type is indicated in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95)  * @result->t and any converted value is placed into an appropriate member of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96)  * the union in @result.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98)  * The function returns the parameter number if the parameter was matched,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99)  * -ENOPARAM if it wasn't matched and @desc->ignore_unknown indicated that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)  * unknown parameters are okay and -EINVAL if there was a conversion issue or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)  * the parameter wasn't recognised and unknowns aren't okay.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) int __fs_parse(struct p_log *log,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	     const struct fs_parameter_spec *desc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	     struct fs_parameter *param,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	     struct fs_parse_result *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	const struct fs_parameter_spec *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	result->uint_64 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	p = fs_lookup_key(desc, param, &result->negated);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	if (!p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		return -ENOPARAM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	if (p->flags & fs_param_deprecated)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		warn_plog(log, "Deprecated parameter '%s'", param->key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	/* Try to turn the type we were given into the type desired by the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	 * parameter and give an error if we can't.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	if (is_flag(p)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		if (param->type != fs_value_is_flag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 			return inval_plog(log, "Unexpected value for '%s'",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 				      param->key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		result->boolean = !result->negated;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	} else  {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		int ret = p->type(log, p, param, result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	return p->opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) EXPORT_SYMBOL(__fs_parse);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)  * fs_lookup_param - Look up a path referred to by a parameter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)  * @fc: The filesystem context to log errors through.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)  * @param: The parameter.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)  * @want_bdev: T if want a blockdev
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)  * @_path: The result of the lookup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) int fs_lookup_param(struct fs_context *fc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		    struct fs_parameter *param,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		    bool want_bdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		    struct path *_path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	struct filename *f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	unsigned int flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	bool put_f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	switch (param->type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	case fs_value_is_string:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		f = getname_kernel(param->string);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		if (IS_ERR(f))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 			return PTR_ERR(f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		put_f = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	case fs_value_is_filename:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		f = param->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		put_f = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		return invalf(fc, "%s: not usable as path", param->key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	f->refcnt++; /* filename_lookup() drops our ref. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	ret = filename_lookup(param->dirfd, f, flags, _path, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		errorf(fc, "%s: Lookup failure for '%s'", param->key, f->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	if (want_bdev &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	    !S_ISBLK(d_backing_inode(_path->dentry)->i_mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		path_put(_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		_path->dentry = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		_path->mnt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		errorf(fc, "%s: Non-blockdev passed as '%s'",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		       param->key, f->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		ret = -ENOTBLK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	if (put_f)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		putname(f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) EXPORT_SYMBOL(fs_lookup_param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static int fs_param_bad_value(struct p_log *log, struct fs_parameter *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	return inval_plog(log, "Bad value for '%s'", param->key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) int fs_param_is_bool(struct p_log *log, const struct fs_parameter_spec *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		     struct fs_parameter *param, struct fs_parse_result *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	int b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	if (param->type != fs_value_is_string)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		return fs_param_bad_value(log, param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	b = lookup_constant(bool_names, param->string, -1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	if (b == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		return fs_param_bad_value(log, param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	result->boolean = b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) EXPORT_SYMBOL(fs_param_is_bool);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) int fs_param_is_u32(struct p_log *log, const struct fs_parameter_spec *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		    struct fs_parameter *param, struct fs_parse_result *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	int base = (unsigned long)p->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	if (param->type != fs_value_is_string ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	    kstrtouint(param->string, base, &result->uint_32) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		return fs_param_bad_value(log, param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) EXPORT_SYMBOL(fs_param_is_u32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) int fs_param_is_s32(struct p_log *log, const struct fs_parameter_spec *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		    struct fs_parameter *param, struct fs_parse_result *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	if (param->type != fs_value_is_string ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	    kstrtoint(param->string, 0, &result->int_32) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		return fs_param_bad_value(log, param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) EXPORT_SYMBOL(fs_param_is_s32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) int fs_param_is_u64(struct p_log *log, const struct fs_parameter_spec *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		    struct fs_parameter *param, struct fs_parse_result *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	if (param->type != fs_value_is_string ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	    kstrtoull(param->string, 0, &result->uint_64) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		return fs_param_bad_value(log, param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) EXPORT_SYMBOL(fs_param_is_u64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) int fs_param_is_enum(struct p_log *log, const struct fs_parameter_spec *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		     struct fs_parameter *param, struct fs_parse_result *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	const struct constant_table *c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	if (param->type != fs_value_is_string)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		return fs_param_bad_value(log, param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	c = __lookup_constant(p->data, param->string);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	if (!c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		return fs_param_bad_value(log, param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	result->uint_32 = c->value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) EXPORT_SYMBOL(fs_param_is_enum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) int fs_param_is_string(struct p_log *log, const struct fs_parameter_spec *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		       struct fs_parameter *param, struct fs_parse_result *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	if (param->type != fs_value_is_string || !*param->string)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		return fs_param_bad_value(log, param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) EXPORT_SYMBOL(fs_param_is_string);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) int fs_param_is_blob(struct p_log *log, const struct fs_parameter_spec *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		     struct fs_parameter *param, struct fs_parse_result *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	if (param->type != fs_value_is_blob)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		return fs_param_bad_value(log, param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) EXPORT_SYMBOL(fs_param_is_blob);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) int fs_param_is_fd(struct p_log *log, const struct fs_parameter_spec *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		  struct fs_parameter *param, struct fs_parse_result *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	switch (param->type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	case fs_value_is_string:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		if (kstrtouint(param->string, 0, &result->uint_32) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		if (result->uint_32 <= INT_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	case fs_value_is_file:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		result->uint_32 = param->dirfd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		if (result->uint_32 <= INT_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	return fs_param_bad_value(log, param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) EXPORT_SYMBOL(fs_param_is_fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) int fs_param_is_blockdev(struct p_log *log, const struct fs_parameter_spec *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		  struct fs_parameter *param, struct fs_parse_result *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) EXPORT_SYMBOL(fs_param_is_blockdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) int fs_param_is_path(struct p_log *log, const struct fs_parameter_spec *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		     struct fs_parameter *param, struct fs_parse_result *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) EXPORT_SYMBOL(fs_param_is_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) #ifdef CONFIG_VALIDATE_FS_PARSER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)  * validate_constant_table - Validate a constant table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)  * @name: Name to use in reporting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)  * @tbl: The constant table to validate.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)  * @tbl_size: The size of the table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)  * @low: The lowest permissible value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)  * @high: The highest permissible value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)  * @special: One special permissible value outside of the range.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) bool validate_constant_table(const struct constant_table *tbl, size_t tbl_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 			     int low, int high, int special)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	size_t i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	bool good = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	if (tbl_size == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 		pr_warn("VALIDATE C-TBL: Empty\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	for (i = 0; i < tbl_size; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 		if (!tbl[i].name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 			pr_err("VALIDATE C-TBL[%zu]: Null\n", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 			good = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 		} else if (i > 0 && tbl[i - 1].name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 			int c = strcmp(tbl[i-1].name, tbl[i].name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 			if (c == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 				pr_err("VALIDATE C-TBL[%zu]: Duplicate %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 				       i, tbl[i].name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 				good = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 			if (c > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 				pr_err("VALIDATE C-TBL[%zu]: Missorted %s>=%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 				       i, tbl[i-1].name, tbl[i].name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 				good = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		if (tbl[i].value != special &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 		    (tbl[i].value < low || tbl[i].value > high)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 			pr_err("VALIDATE C-TBL[%zu]: %s->%d const out of range (%d-%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 			       i, tbl[i].name, tbl[i].value, low, high);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 			good = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	return good;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)  * fs_validate_description - Validate a parameter description
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)  * @desc: The parameter description to validate.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) bool fs_validate_description(const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	const struct fs_parameter_spec *desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	const struct fs_parameter_spec *param, *p2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	bool good = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	for (param = desc; param->name; param++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 		/* Check for duplicate parameter names */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 		for (p2 = desc; p2 < param; p2++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 			if (strcmp(param->name, p2->name) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 				if (is_flag(param) != is_flag(p2))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 					continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 				pr_err("VALIDATE %s: PARAM[%s]: Duplicate\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 				       name, param->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 				good = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	return good;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) #endif /* CONFIG_VALIDATE_FS_PARSER */