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62533ae3fa
Port another optimization from pvscan -aay to vgchange -aay: "pvscan: only add device args to dev cache" This optimization avoids doing a full dev_cache_scan, and instead populates dev-cache with only the devices in the VG being activated. This involves shifting the use of pvs_online files from the hints interface up to the higher level label_scan interface. This specialized label_scan is structured around creating a list of devices from the pvs_online files. Previously, a list of all devices was created first, and then reduced based on the pvs_online files. The initial step of listing all devices was slow when thousands of devices are present on the system. This optimization extends the previous optimization that used pvs_online files to limit the devices that were actually scanned (i.e. reading to identify the device): "vgchange -aay: optimize device scan using pvs_online files"
303 lines
10 KiB
C
303 lines
10 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2009 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_TOOLCONTEXT_H
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#define _LVM_TOOLCONTEXT_H
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#include "lib/device/dev-cache.h"
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#include "lib/device/dev-type.h"
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#include <limits.h>
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/*
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* Config options that can be changed while commands are processed
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*/
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struct config_info {
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int debug;
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int debug_classes;
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int verbose;
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int silent;
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int suppress;
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int test;
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int yes;
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int syslog;
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int activation;
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int suffix;
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int archive; /* should we archive ? */
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int backup; /* should we backup ? */
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int read_ahead; /* DM_READ_AHEAD_NONE or _AUTO */
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int udev_rules;
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int udev_sync;
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int udev_fallback;
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int issue_discards;
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uint32_t journal;
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const char *msg_prefix;
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const char *fmt_name;
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const char *dmeventd_executable;
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uint64_t unit_factor;
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mode_t umask;
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char unit_type;
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char _padding[1];
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};
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struct dm_config_tree;
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struct profile_params;
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struct archive_params;
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struct backup_params;
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struct arg_values;
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struct config_tree_list {
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struct dm_list list;
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struct dm_config_tree *cft;
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};
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struct cmd_context_initialized_parts {
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unsigned config:1; /* used to reinitialize config if previous init was not successful */
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unsigned filters:1;
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unsigned connections:1;
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};
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struct cmd_report {
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int log_only;
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dm_report_group_type_t report_group_type;
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struct dm_report_group *report_group;
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struct dm_report *log_rh;
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const char *log_name;
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log_report_t saved_log_report_state;
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};
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/* FIXME Split into tool & library contexts */
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/* command-instance-related variables needed by library */
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struct cmd_context {
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/*
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* Memory handlers.
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*/
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struct dm_pool *libmem; /* for permanent config data */
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struct dm_pool *mem; /* transient: cleared between each command */
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/*
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* Command line and arguments.
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*/
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const char *cmd_line;
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const char *name; /* needed before cmd->command is set */
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struct command_name *cname;
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struct command *command;
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char **argv;
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struct arg_values *opt_arg_values;
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struct dm_list arg_value_groups;
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int opt_count; /* total number of options (beginning with - or --) */
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/*
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* Position args remaining after command name
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* and --options are removed from original argc/argv.
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*/
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int position_argc;
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char **position_argv;
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/*
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* Format handlers.
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*/
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const struct format_type *fmt; /* current format to use by default */
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struct format_type *fmt_backup; /* format to use for backups */
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struct dm_list formats; /* available formats */
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struct dm_list segtypes; /* available segment types */
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/*
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* Machine and system identification.
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*/
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const char *system_id;
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const char *hostname;
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const char *kernel_vsn;
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/*
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* Device identification.
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*/
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struct dev_types *dev_types; /* recognized extra device types. */
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/*
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* Initialization state.
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*/
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struct cmd_context_initialized_parts initialized;
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/*
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* Switches.
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*/
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unsigned is_long_lived:1; /* optimises persistent_filter handling */
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unsigned is_interactive:1;
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unsigned check_pv_dev_sizes:1;
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unsigned handles_missing_pvs:1;
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unsigned handles_unknown_segments:1;
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unsigned use_linear_target:1;
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unsigned partial_activation:1;
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unsigned degraded_activation:1;
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unsigned auto_set_activation_skip:1;
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unsigned si_unit_consistency:1;
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unsigned report_binary_values_as_numeric:1;
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unsigned report_mark_hidden_devices:1;
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unsigned metadata_read_only:1;
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unsigned threaded:1; /* set if running within a thread e.g. clvmd */
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unsigned unknown_system_id:1;
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unsigned include_historical_lvs:1; /* also process/report/display historical LVs */
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unsigned record_historical_lvs:1; /* record historical LVs */
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unsigned include_exported_vgs:1;
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unsigned include_foreign_vgs:1; /* report/display cmds can reveal foreign VGs */
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unsigned include_shared_vgs:1; /* report/display cmds can reveal lockd VGs */
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unsigned include_active_foreign_vgs:1; /* cmd should process foreign VGs with active LVs */
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unsigned vg_read_print_access_error:1; /* print access errors from vg_read */
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unsigned allow_mixed_block_sizes:1;
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unsigned force_access_clustered:1;
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unsigned lockd_gl_disable:1;
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unsigned lockd_vg_disable:1;
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unsigned lockd_lv_disable:1;
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unsigned lockd_gl_removed:1;
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unsigned lockd_vg_default_sh:1;
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unsigned lockd_vg_enforce_sh:1;
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unsigned lockd_lv_sh_for_ex:1;
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unsigned lockd_global_ex:1; /* set while global lock held ex (lockd) */
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unsigned lockf_global_ex:1; /* set while global lock held ex (flock) */
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unsigned nolocking:1;
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unsigned vg_notify:1;
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unsigned lv_notify:1;
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unsigned pv_notify:1;
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unsigned activate_component:1; /* command activates component LV */
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unsigned process_component_lvs:1; /* command processes also component LVs */
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unsigned mirror_warn_printed:1; /* command already printed warning about non-monitored mirrors */
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unsigned expect_missing_vg_device:1; /* when reading a vg it's expected that a dev for a pv isn't found */
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unsigned can_use_one_scan:1;
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unsigned is_clvmd:1;
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unsigned md_component_detection:1;
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unsigned use_full_md_check:1;
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unsigned is_activating:1;
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unsigned enable_hints:1; /* hints are enabled for cmds in general */
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unsigned use_hints:1; /* if hints are enabled this cmd can use them */
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unsigned pvscan_recreate_hints:1; /* enable special case hint handling for pvscan --cache */
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unsigned scan_lvs:1;
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unsigned wipe_outdated_pvs:1;
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unsigned enable_devices_list:1; /* command is using --devices option */
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unsigned enable_devices_file:1; /* command is using devices file */
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unsigned pending_devices_file:1; /* command may create and enable devices file */
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unsigned create_edit_devices_file:1; /* command expects to create and/or edit devices file */
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unsigned edit_devices_file:1; /* command expects to edit devices file */
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unsigned filter_deviceid_skip:1; /* don't use filter-deviceid */
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unsigned filter_regex_with_devices_file:1; /* use filter-regex even when devices file is enabled */
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unsigned filter_nodata_only:1; /* only use filters that do not require data from the dev */
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unsigned run_by_dmeventd:1; /* command is being run by dmeventd */
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unsigned sysinit:1; /* --sysinit is used */
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unsigned ignorelockingfailure:1; /* --ignorelockingfailure is used */
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unsigned check_devs_used:1; /* check devs used by LVs */
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unsigned print_device_id_not_found:1; /* print devices file entries not found */
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unsigned ignore_device_name_mismatch:1; /* skip updating devices file names */
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unsigned backup_disabled:1; /* skip repeated debug message */
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unsigned event_activation:1; /* whether event_activation is set */
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unsigned udevoutput:1;
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/*
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* Devices and filtering.
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*/
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struct dev_filter *filter;
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struct dm_list use_devices; /* struct dev_use for each entry in devices file */
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const char *md_component_checks;
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const char *search_for_devnames; /* config file setting */
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const char *devicesfile; /* from --devicesfile option */
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struct dm_list deviceslist; /* from --devices option, struct dm_str_list */
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/*
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* Configuration.
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*/
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struct dm_list config_files; /* master lvm config + any existing tag configs */
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struct profile_params *profile_params; /* profile handling params including loaded profile configs */
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struct dm_config_tree *cft; /* the whole cascade: CONFIG_STRING -> CONFIG_PROFILE -> CONFIG_FILE/CONFIG_MERGED_FILES */
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struct dm_hash_table *cft_def_hash; /* config definition hash used for validity check (item type + item recognized) */
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struct config_info default_settings; /* selected settings with original default/configured value which can be changed during cmd processing */
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struct config_info current_settings; /* may contain changed values compared to default_settings */
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/*
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* Archives and backups.
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*/
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struct archive_params *archive_params;
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struct backup_params *backup_params;
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const char *stripe_filler;
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/*
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* Host tags.
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*/
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struct dm_list tags; /* list of defined tags */
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int hosttags;
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/*
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* Paths.
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*/
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const char *lib_dir; /* cache value global/library_dir */
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char system_dir[PATH_MAX];
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char dev_dir[PATH_MAX];
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char proc_dir[PATH_MAX];
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char devices_file_path[PATH_MAX];
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/*
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* Reporting.
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*/
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struct cmd_report cmd_report;
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/*
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* Buffers.
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*/
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char display_buffer[NAME_LEN * 10]; /* ring buffer for upto 10 longest vg/lv names */
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unsigned display_lvname_idx; /* index to ring buffer */
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char *linebuffer;
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/*
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* Others - unsorted.
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*/
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const char *report_list_item_separator;
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const char *time_format;
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unsigned rand_seed;
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struct dm_list pending_delete; /* list of LVs for removal */
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struct dm_pool *pending_delete_mem; /* memory pool for pending deletes */
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};
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/*
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* system_dir may be NULL to use the default value.
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* The environment variable LVM_SYSTEM_DIR always takes precedence.
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*/
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struct cmd_context *create_toolcontext(unsigned is_clvmd,
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const char *system_dir,
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unsigned set_buffering,
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unsigned threaded,
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unsigned set_connections,
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unsigned set_filters);
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void destroy_toolcontext(struct cmd_context *cmd);
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int refresh_toolcontext(struct cmd_context *cmd);
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int refresh_filters(struct cmd_context *cmd);
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int process_profilable_config(struct cmd_context *cmd);
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int config_files_changed(struct cmd_context *cmd);
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int init_lvmcache_orphans(struct cmd_context *cmd);
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int init_filters(struct cmd_context *cmd, unsigned load_persistent_cache);
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int init_connections(struct cmd_context *cmd);
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int init_run_by_dmeventd(struct cmd_context *cmd);
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/*
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* A config context is a very light weight cmd struct that
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* is only used for reading config settings from lvm.conf,
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* which are at cmd->cft.
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*/
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struct cmd_context *create_config_context(void);
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void destroy_config_context(struct cmd_context *cmd);
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struct format_type *get_format_by_name(struct cmd_context *cmd, const char *format);
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const char *system_id_from_string(struct cmd_context *cmd, const char *str);
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#endif
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