lvm2/lib/commands/toolcontext.h

/*
 * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.  
 * Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved.
 *
 * This file is part of LVM2.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU Lesser General Public License v.2.1.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef _LVM_TOOLCONTEXT_H
#define _LVM_TOOLCONTEXT_H

#include "dev-cache.h"
#include "dev-type.h"

#include <limits.h>

/*
 * Config options that can be changed while commands are processed
 */
struct config_info {
	int debug;
	int debug_classes;
	int verbose;
	int silent;
	int test;
	int syslog;
	int activation;
	int suffix;
	int archive;		/* should we archive ? */
	int backup;		/* should we backup ? */
	int read_ahead;		/* DM_READ_AHEAD_NONE or _AUTO */
	int udev_rules;
	int udev_sync;
	int udev_fallback;
	int cache_vgmetadata;
	const char *msg_prefix;
	const char *fmt_name;
	const char *dmeventd_executable;
	uint64_t unit_factor;
	int cmd_name;		/* Show command name? */
	mode_t umask;
	char unit_type;
	char _padding[1];
};

struct dm_config_tree;
struct profile_params;
struct archive_params;
struct backup_params;
struct arg_values;

struct config_tree_list {
	struct dm_list list;
	struct dm_config_tree *cft;
};

struct cmd_context_initialized_parts {
	unsigned config:1; /* used to reinitialize config if previous init was not successful */
	unsigned filters:1;
	unsigned connections:1;
};

struct cmd_report {
	int log_only;
	dm_report_group_type_t report_group_type;
	struct dm_report_group *report_group;
	struct dm_report *log_rh;
	const char *log_name;
	log_report_t saved_log_report_state;
};

/* FIXME Split into tool & library contexts */
/* command-instance-related variables needed by library */
struct cmd_context {
	/*
	 * Memory handlers.
	 */
	struct dm_pool *libmem;			/* for permanent config data */
	struct dm_pool *mem;			/* transient: cleared between each command */

	/*
	 * Command line and arguments.
	 */
	const char *cmd_line;
	const char *name; /* needed before cmd->command is set */
	struct command_name *cname;
	struct command *command;
	char **argv;
	struct arg_values *opt_arg_values;
	struct dm_list arg_value_groups;

	/*
	 * Position args remaining after command name
	 * and --options are removed from original argc/argv.
	 */
	int position_argc;
	char **position_argv;

	/*
	 * Format handlers.
	 */
	const struct format_type *fmt;		/* current format to use by default */
	struct format_type *fmt_backup;		/* format to use for backups */
	struct dm_list formats;			/* available formats */
	struct dm_list segtypes;		/* available segment types */

	/*
	 * Machine and system identification.
	 */
	const char *system_id;
	const char *hostname;
	const char *kernel_vsn;

	/*
	 * Device identification.
	 */
	struct dev_types *dev_types;		/* recognized extra device types. */

	/*
	 * Initialization state.
	 */
	struct cmd_context_initialized_parts initialized;

	/*
	 * Switches.
	 */
	unsigned is_long_lived:1;		/* optimises persistent_filter handling */
	unsigned is_interactive:1;
	unsigned check_pv_dev_sizes:1;
	unsigned handles_missing_pvs:1;
	unsigned handles_unknown_segments:1;
	unsigned use_linear_target:1;
	unsigned partial_activation:1;
	unsigned degraded_activation:1;
	unsigned auto_set_activation_skip:1;
	unsigned si_unit_consistency:1;
	unsigned report_binary_values_as_numeric:1;
	unsigned report_mark_hidden_devices:1;
	unsigned metadata_read_only:1;
	unsigned ignore_clustered_vgs:1;
	unsigned threaded:1;			/* set if running within a thread e.g. clvmd */
	unsigned independent_metadata_areas:1;	/* active formats have MDAs outside PVs */
	unsigned unknown_system_id:1;
	unsigned include_historical_lvs:1;	/* also process/report/display historical LVs */
	unsigned record_historical_lvs:1;	/* record historical LVs */
	unsigned include_foreign_vgs:1;		/* report/display cmds can reveal foreign VGs */
	unsigned include_shared_vgs:1;		/* report/display cmds can reveal lockd VGs */
	unsigned include_active_foreign_vgs:1;	/* cmd should process foreign VGs with active LVs */
	unsigned vg_read_print_access_error:1;	/* print access errors from vg_read */
	unsigned lockd_gl_disable:1;
	unsigned lockd_vg_disable:1;
	unsigned lockd_lv_disable:1;
	unsigned lockd_gl_removed:1;
	unsigned lockd_vg_rescan:1;
	unsigned lockd_vg_default_sh:1;
	unsigned lockd_vg_enforce_sh:1;
	unsigned lockd_lv_sh:1;
	unsigned vg_notify:1;
	unsigned lv_notify:1;
	unsigned pv_notify:1;
	unsigned activate_component:1;		/* command activates component LV */
	unsigned process_component_lvs:1;	/* command processes also component LVs */
	unsigned mirror_warn_printed:1;		/* command already printed warning about non-monitored mirrors */
	unsigned pvscan_cache_single:1;
	/*
	 * Filtering.
	 */
	struct dev_filter *lvmetad_filter;	/* pre-lvmetad filter chain */
	struct dev_filter *filter;		/* post-lvmetad filter chain */
	struct dev_filter *full_filter;		/* lvmetad_filter + filter */
	int dump_filter;			/* Dump filter when exiting? */

	/*
	 * Configuration.
	 */
	struct dm_list config_files; 		/* master lvm config + any existing tag configs */
	struct profile_params *profile_params;	/* profile handling params including loaded profile configs */
	struct dm_config_tree *cft;		/* the whole cascade: CONFIG_STRING -> CONFIG_PROFILE -> CONFIG_FILE/CONFIG_MERGED_FILES */
	struct dm_hash_table *cft_def_hash;	/* config definition hash used for validity check (item type + item recognized) */
	struct config_info default_settings;	/* selected settings with original default/configured value which can be changed during cmd processing */
	struct config_info current_settings; 	/* may contain changed values compared to default_settings */

	/*
	 * Archives and backups.
	 */
	struct archive_params *archive_params;
	struct backup_params *backup_params;
	const char *stripe_filler;

	/*
	 * Host tags.
	 */
	struct dm_list tags;			/* list of defined tags */
	int hosttags;

	/*
	 * Paths.
	 */
	const char *lib_dir;			/* cache value global/library_dir */
	char system_dir[PATH_MAX];
	char dev_dir[PATH_MAX];
	char proc_dir[PATH_MAX];

	/*
	 * Reporting.
	 */
	struct cmd_report cmd_report;

	/*
	 * Buffers.
	 */
	char display_buffer[NAME_LEN * 10];	/* ring buffer for upto 10 longest vg/lv names */
	unsigned display_lvname_idx;		/* index to ring buffer */
	char *linebuffer;

	/*
	 * Others - unsorted.
	 */
	const char *report_list_item_separator;
	const char *time_format;
	unsigned rand_seed;
	struct dm_list unused_duplicate_devs; /* save preferences between lvmcache instances */
};

/*
 * system_dir may be NULL to use the default value.
 * The environment variable LVM_SYSTEM_DIR always takes precedence.
 */
struct cmd_context *create_toolcontext(unsigned is_long_lived,
				       const char *system_dir,
				       unsigned set_buffering,
				       unsigned threaded,
				       unsigned set_connections,
				       unsigned set_filters);
void destroy_toolcontext(struct cmd_context *cmd);
int refresh_toolcontext(struct cmd_context *cmd);
int refresh_filters(struct cmd_context *cmd);
int process_profilable_config(struct cmd_context *cmd);
int config_files_changed(struct cmd_context *cmd);
int init_lvmcache_orphans(struct cmd_context *cmd);
int init_filters(struct cmd_context *cmd, unsigned load_persistent_cache);
int init_connections(struct cmd_context *cmd);
int init_run_by_dmeventd(struct cmd_context *cmd);

/*
 * A config context is a very light weight cmd struct that
 * is only used for reading config settings from lvm.conf,
 * which are at cmd->cft.
 */
struct cmd_context *create_config_context(void);
void destroy_config_context(struct cmd_context *cmd);

struct format_type *get_format_by_name(struct cmd_context *cmd, const char *format);

const char *system_id_from_string(struct cmd_context *cmd, const char *str);

#endif