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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140/* 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;};
struct fs_parameter_spec;struct fs_parse_result;typedef int fs_param_type(struct p_log *, const struct fs_parameter_spec *, struct fs_parameter *, struct fs_parse_result *);/* * The type of parameter expected. */fs_param_type fs_param_is_bool, fs_param_is_u32, fs_param_is_s32, fs_param_is_u64, fs_param_is_enum, fs_param_is_string, fs_param_is_blockdev, fs_param_is_fd, fs_param_is_uid, fs_param_is_gid, fs_param_is_file_or_string;
/* * 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; fs_param_type *type; /* The desired parameter type */ u8 opt; /* Option number (returned by fs_parse()) */ unsigned short flags;#define fs_param_neg_with_no 0x0002 /* "noxxx" is negative param */#define fs_param_can_be_empty 0x0004 /* "xxx=" is allowed */#define fs_param_deprecated 0x0008 /* The param is deprecated */ const void *data;};
/* * Result of parse. */struct fs_parse_result { bool negated; /* T if param was "noxxx" */ 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 */ kuid_t uid; kgid_t gid; };};
extern int __fs_parse(struct p_log *log, const struct fs_parameter_spec *desc, struct fs_parameter *value, struct fs_parse_result *result);
static inline int fs_parse(struct fs_context *fc, const struct fs_parameter_spec *desc, struct fs_parameter *param, struct fs_parse_result *result){ return __fs_parse(&fc->log, desc, param, result);}
extern int fs_lookup_param(struct fs_context *fc, struct fs_parameter *param, bool want_bdev, unsigned int flags, struct path *_path);
extern int lookup_constant(const struct constant_table tbl[], const char *name, int not_found);
#ifdef CONFIG_VALIDATE_FS_PARSERextern bool fs_validate_description(const char *name, const struct fs_parameter_spec *desc);#elsestatic inline bool fs_validate_description(const char *name, const struct fs_parameter_spec *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, DATA) \ { \ .name = NAME, \ .opt = OPT, \ .type = TYPE, \ .flags = FLAGS, \ .data = DATA \ }
#define fsparam_flag(NAME, OPT) __fsparam(NULL, NAME, OPT, 0, NULL)#define fsparam_flag_no(NAME, OPT) \ __fsparam(NULL, NAME, OPT, fs_param_neg_with_no, NULL)#define fsparam_bool(NAME, OPT) __fsparam(fs_param_is_bool, NAME, OPT, 0, NULL)#define fsparam_u32(NAME, OPT) __fsparam(fs_param_is_u32, NAME, OPT, 0, NULL)#define fsparam_u32oct(NAME, OPT) \ __fsparam(fs_param_is_u32, NAME, OPT, 0, (void *)8)#define fsparam_u32hex(NAME, OPT) \ __fsparam(fs_param_is_u32, NAME, OPT, 0, (void *)16)#define fsparam_s32(NAME, OPT) __fsparam(fs_param_is_s32, NAME, OPT, 0, NULL)#define fsparam_u64(NAME, OPT) __fsparam(fs_param_is_u64, NAME, OPT, 0, NULL)#define fsparam_enum(NAME, OPT, array) __fsparam(fs_param_is_enum, NAME, OPT, 0, array)#define fsparam_string(NAME, OPT) \ __fsparam(fs_param_is_string, NAME, OPT, 0, NULL)#define fsparam_bdev(NAME, OPT) __fsparam(fs_param_is_blockdev, NAME, OPT, 0, NULL)#define fsparam_fd(NAME, OPT) __fsparam(fs_param_is_fd, NAME, OPT, 0, NULL)#define fsparam_file_or_string(NAME, OPT) \ __fsparam(fs_param_is_file_or_string, NAME, OPT, 0, NULL)#define fsparam_uid(NAME, OPT) __fsparam(fs_param_is_uid, NAME, OPT, 0, NULL)#define fsparam_gid(NAME, OPT) __fsparam(fs_param_is_gid, NAME, OPT, 0, NULL)
/* String parameter that allows empty argument */#define fsparam_string_empty(NAME, OPT) \ __fsparam(fs_param_is_string, NAME, OPT, fs_param_can_be_empty, NULL)
#endif /* _LINUX_FS_PARSER_H */