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276 lines
8.7 KiB
C
276 lines
8.7 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2015 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _LVM_COMMAND_H
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#define _LVM_COMMAND_H
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struct cmd_context;
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struct logical_volume;
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/* old per-command-name function */
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typedef int (*command_fn) (struct cmd_context *cmd, int argc, char **argv);
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struct command_function {
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int command_enum;
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command_fn fn; /* new style */
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};
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struct command_name {
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const char *name;
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const char *desc; /* general command description from commands.h */
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unsigned int flags;
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command_fn fn; /* old style */
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uint16_t lvm_command_enum; /* as declared in commands.h with _COMMAND */
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};
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struct command_name_args {
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uint16_t num_args;
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uint16_t variants; /* number of command defs with this command name */
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/* union of {required,optional}_opt_args for all commands with this name */
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uint16_t valid_args[ARG_COUNT]; /* used for getopt, store option */
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/* the following are for generating help and man page output */
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uint8_t common_options[ARG_COUNT]; /* options common to all defs 0/1 */
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uint8_t all_options[ARG_COUNT]; /* union of options from all defs 0/1 */
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uint8_t variant_has_ro; /* do variants use required_opt_args ? */
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uint8_t variant_has_rp; /* do variants use required_pos_args ? */
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uint8_t variant_has_oo; /* do variants use optional_opt_args ? */
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uint8_t variant_has_op; /* do variants use optional_pos_args ? */
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};
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/*
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* Command defintion
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*
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* A command is defined in terms of a command name,
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* required options (+args), optional options (+args),
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* required positional args, optional positional args.
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*
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* A positional arg always has non-zero pos_arg.def.types.
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* The first positional arg has pos_arg.pos of 1.
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*/
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/* arg_def flags */
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#define ARG_DEF_FLAG_NEW_VG 1 << 0
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#define ARG_DEF_FLAG_NEW_LV 1 << 1
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#define ARG_DEF_FLAG_MAY_REPEAT 1 << 2
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static inline int val_bit_is_set(uint64_t val_bits, int val_enum)
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{
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return (val_bits & (1ULL << val_enum)) ? 1 : 0;
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}
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static inline uint64_t val_enum_to_bit(int val_enum)
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{
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return (1ULL << val_enum);
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}
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static inline int lvp_bit_is_set(uint64_t lvp_bits, int lvp_enum)
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{
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return (lvp_bits & (1ULL << lvp_enum)) ? 1 : 0;
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}
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static inline uint64_t lvp_enum_to_bit(int lvp_enum)
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{
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return (1ULL << lvp_enum);
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}
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static inline int lvt_bit_is_set(uint64_t lvt_bits, int lvt_enum)
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{
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return (lvt_bits & (1ULL << lvt_enum)) ? 1 : 0;
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}
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static inline uint64_t lvt_enum_to_bit(int lvt_enum)
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{
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return (1ULL << lvt_enum);
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}
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/* Description a value that follows an option or exists in a position. */
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struct arg_def {
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uint64_t val_bits; /* bits of x_VAL, can be multiple for pos_arg */
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uint64_t lvt_bits; /* lvt_enum_to_bit(x_LVT) for lv_VAL, can be multiple */
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const char *str; /* a literal string for constnum_VAL */
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uint32_t flags; /* ARG_DEF_FLAG_ */
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uint16_t num; /* a literal number for conststr_VAL */
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};
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/* Description of an option and the value that follows it. */
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struct opt_arg {
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int opt; /* option, e.g. foo_ARG */
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struct arg_def def; /* defines accepted values */
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};
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/* Description of a position and the value that exists there. */
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struct pos_arg {
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int pos; /* position, e.g. first is 1 */
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struct arg_def def; /* defines accepted values */
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};
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/*
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* Commands using a given command definition must follow a set
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* of rules. If a given command+LV matches the conditions in
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* opts/lvt_bits/lvp_bits, then the checks are applied.
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* If one condition is not met, the checks are not applied.
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* If no conditions are set, the checks are always applied.
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*/
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#define RULE_INVALID 1
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#define RULE_REQUIRE 2
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#define MAX_RULE_OPTS 8
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struct cmd_rule {
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uint64_t lvt_bits; /* if LV has one of these types (lvt_enum_to_bit), the check may apply */
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uint64_t lvp_bits; /* if LV has all of these properties (lvp_enum_to_bit), the check may apply */
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uint64_t check_lvt_bits; /* LV must [not] have one of these type */
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uint64_t check_lvp_bits; /* LV must [not] have all of these properties */
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uint16_t opts[MAX_RULE_OPTS]; /* if any option in this list is set, the check may apply */
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uint16_t check_opts[MAX_RULE_OPTS];/* used options must [not] be in this list */
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uint16_t rule; /* RULE_INVALID, RULE_REQUIRE: check values must [not] be true */
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uint16_t opts_count; /* entries in opts[] */
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uint16_t check_opts_count; /* entries in check_opts[] */
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};
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/*
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* Array sizes
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*
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* CMD_RO_ARGS needs to accommodate a list of options,
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* of which one is required after which the rest are
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* optional.
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*/
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#define CMD_RO_ARGS 32 /* required opt args */
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#define CMD_OO_ARGS 56 /* optional opt args */
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#define CMD_RP_ARGS 8 /* required positional args */
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#define CMD_OP_ARGS 8 /* optional positional args */
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#define CMD_IO_ARGS 8 /* ignore opt args */
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#define CMD_MAX_RULES 12 /* max number of rules per command def */
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/*
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* one or more from required_opt_args is required,
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* then the rest are optional.
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*
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* CMD_FLAG_ANY_REQUIRED_OPT: for lvchange/vgchange special case.
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* The first ro_count entries of required_opt_args must be met
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* (ro_count may be 0.) After this, one or more options must be
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* set from the remaining required_opt_args. So, the first
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* ro_count options in required_opt_args must match, and after
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* that one or more of the remaining options in required_opt_args
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* must match.
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*/
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#define CMD_FLAG_ANY_REQUIRED_OPT 1
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#define CMD_FLAG_SECONDARY_SYNTAX 2 /* allows syntax variants to be suppressed in certain output */
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#define CMD_FLAG_PREVIOUS_SYNTAX 4 /* allows syntax variants to not be advertised in output */
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#define CMD_FLAG_PARSE_ERROR 8 /* error parsing command-lines.in def */
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/* a register of the lvm commands */
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struct command {
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const char *name;
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const char *desc; /* specific command description from command-lines.in */
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uint16_t command_enum; /* <command_id>_CMD */
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uint16_t command_index; /* position in commands[] */
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uint16_t lvm_command_enum; /* position in command_names[] */
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uint16_t cmd_flags; /* CMD_FLAG_ */
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/* definitions of opt/pos args */
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/* required args following an --opt */
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struct opt_arg required_opt_args[CMD_RO_ARGS];
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/* optional args following an --opt */
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struct opt_arg optional_opt_args[CMD_OO_ARGS];
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/* required positional args */
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struct pos_arg required_pos_args[CMD_RP_ARGS];
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/* optional positional args */
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struct pos_arg optional_pos_args[CMD_OP_ARGS];
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/* unused opt args, are ignored instead of causing an error */
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struct opt_arg ignore_opt_args[CMD_IO_ARGS];
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struct cmd_rule rules[CMD_MAX_RULES];
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/* usually only one autotype, in one case there are two */
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char *autotype;
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char *autotype2;
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uint16_t any_ro_count;
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uint16_t ro_count;
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uint16_t oo_count;
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uint16_t rp_count;
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uint16_t op_count;
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uint16_t io_count;
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uint16_t rule_count;
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uint16_t pos_count; /* temp counter used by create-command */
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};
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/* see global opt_names[] */
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struct opt_name {
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const char *desc;
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const char long_opt[27];/* --foo */
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const char short_opt; /* -f */
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uint16_t opt_enum; /* foo_ARG */
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uint16_t val_enum; /* xyz_VAL when --foo takes a val like "--foo xyz" */
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uint16_t flags;
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uint16_t prio;
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};
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/* see global val_names[] */
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struct val_name {
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int (*fn) (struct cmd_context *cmd, struct arg_values *av); /* foo_arg() */
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const char *usage;
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const char name[30]; /* FooVal */
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uint16_t name_len; /* sizeof(FooVal) - 1 */
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uint16_t val_enum; /* foo_VAL */
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};
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/* see global lv_props[] */
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struct lv_prop {
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const char name[30]; /* "lv_is_foo" */
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uint16_t lvp_enum; /* is_foo_LVP */
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};
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/* see global lv_types[] */
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struct lv_type {
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const char name[30]; /* "foo" */
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uint16_t lvt_enum; /* foo_LVT */
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};
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int define_commands(struct cmd_context *cmdtool, const char *run_name);
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unsigned command_id_to_enum(const char *str);
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const char *command_enum(unsigned command_enum);
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void print_usage(struct command *cmd, int longhelp, int desc_first);
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void print_usage_common_cmd(const struct command_name *cname, struct command *cmd);
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void print_usage_common_lvm(const struct command_name *cname, struct command *cmd);
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void print_usage_notes(const struct command_name *cname);
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void factor_common_options(void);
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int command_has_alternate_extents(const struct command_name *cname);
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int configure_command_option_values(const struct command_name *cname, int arg_enum, int val_enum);
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const struct command_name *find_command_name(const char *name);
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#endif
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