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/* SPDX-License-Identifier: GPL-2.0-or-later */ /* Filesystem parameter description and parser * * Copyright (C) 2018 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) */ #ifndef _LINUX_FS_PARSER_H #define _LINUX_FS_PARSER_H #include <linux/fs_context.h> struct path; struct constant_table { const char *name; int value; }; /* * The type of parameter expected. */ enum fs_parameter_type { __fs_param_wasnt_defined, fs_param_is_flag, fs_param_is_bool, fs_param_is_u32, fs_param_is_u32_octal, fs_param_is_u32_hex, fs_param_is_s32, fs_param_is_u64, fs_param_is_enum, fs_param_is_string, fs_param_is_blob, fs_param_is_blockdev, fs_param_is_path, fs_param_is_fd, nr__fs_parameter_type, }; /* * Specification of the type of value a parameter wants. * * Note that the fsparam_flag(), fsparam_string(), fsparam_u32(), ... macros * should be used to generate elements of this type. */ struct fs_parameter_spec { const char *name; u8 opt; /* Option number (returned by fs_parse()) */ enum fs_parameter_type type:8; /* The desired parameter type */ unsigned short flags; #define fs_param_v_optional 0x0001 /* The value is optional */ #define fs_param_neg_with_no 0x0002 /* "noxxx" is negative param */ #define fs_param_neg_with_empty 0x0004 /* "xxx=" is negative param */ #define fs_param_deprecated 0x0008 /* The param is deprecated */ }; struct fs_parameter_enum { u8 opt; /* Option number (as fs_parameter_spec::opt) */ char name[14]; u8 value; }; struct fs_parameter_description { const char name[16]; /* Name for logging purposes */ const struct fs_parameter_spec *specs; /* List of param specifications */ const struct fs_parameter_enum *enums; /* Enum values */ }; /* * Result of parse. */ struct fs_parse_result { bool negated; /* T if param was "noxxx" */ bool has_value; /* T if value supplied to param */ union { bool boolean; /* For spec_bool */ int int_32; /* For spec_s32/spec_enum */ unsigned int uint_32; /* For spec_u32{,_octal,_hex}/spec_enum */ u64 uint_64; /* For spec_u64 */ }; }; extern int fs_parse(struct fs_context *fc, const struct fs_parameter_description *desc, struct fs_parameter *value, struct fs_parse_result *result); extern int fs_lookup_param(struct fs_context *fc, struct fs_parameter *param, bool want_bdev, struct path *_path); extern int __lookup_constant(const struct constant_table tbl[], size_t tbl_size, const char *name, int not_found); #define lookup_constant(t, n, nf) __lookup_constant(t, ARRAY_SIZE(t), (n), (nf)) #ifdef CONFIG_VALIDATE_FS_PARSER extern bool validate_constant_table(const struct constant_table *tbl, size_t tbl_size, int low, int high, int special); extern bool fs_validate_description(const struct fs_parameter_description *desc); #else static inline bool validate_constant_table(const struct constant_table *tbl, size_t tbl_size, int low, int high, int special) { return true; } static inline bool fs_validate_description(const struct fs_parameter_description *desc) { return true; } #endif /* * Parameter type, name, index and flags element constructors. Use as: * * fsparam_xxxx("foo", Opt_foo) * * If existing helpers are not enough, direct use of __fsparam() would * work, but any such case is probably a sign that new helper is needed. * Helpers will remain stable; low-level implementation may change. */ #define __fsparam(TYPE, NAME, OPT, FLAGS) \ { \ .name = NAME, \ .opt = OPT, \ .type = TYPE, \ .flags = FLAGS \ } #define fsparam_flag(NAME, OPT) __fsparam(fs_param_is_flag, NAME, OPT, 0) #define fsparam_flag_no(NAME, OPT) \ __fsparam(fs_param_is_flag, NAME, OPT, \ fs_param_neg_with_no) #define fsparam_bool(NAME, OPT) __fsparam(fs_param_is_bool, NAME, OPT, 0) #define fsparam_u32(NAME, OPT) __fsparam(fs_param_is_u32, NAME, OPT, 0) #define fsparam_u32oct(NAME, OPT) \ __fsparam(fs_param_is_u32_octal, NAME, OPT, 0) #define fsparam_u32hex(NAME, OPT) \ __fsparam(fs_param_is_u32_hex, NAME, OPT, 0) #define fsparam_s32(NAME, OPT) __fsparam(fs_param_is_s32, NAME, OPT, 0) #define fsparam_u64(NAME, OPT) __fsparam(fs_param_is_u64, NAME, OPT, 0) #define fsparam_enum(NAME, OPT) __fsparam(fs_param_is_enum, NAME, OPT, 0) #define fsparam_string(NAME, OPT) \ __fsparam(fs_param_is_string, NAME, OPT, 0) #define fsparam_blob(NAME, OPT) __fsparam(fs_param_is_blob, NAME, OPT, 0) #define fsparam_bdev(NAME, OPT) __fsparam(fs_param_is_blockdev, NAME, OPT, 0) #define fsparam_path(NAME, OPT) __fsparam(fs_param_is_path, NAME, OPT, 0) #define fsparam_fd(NAME, OPT) __fsparam(fs_param_is_fd, NAME, OPT, 0) #endif /* _LINUX_FS_PARSER_H */
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