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adb9fe6224
The copy of VG metadata stored in lvmcache was not being used in general. It pretended to be a generic VG metadata cache, but was not being used except for clvmd activation. There it was used to avoid reading from disk while devices were suspended, i.e. in resume. This removes the code that attempted to make this look like a generic metadata cache, and replaces with with something narrowly targetted to what it's actually used for. This is a way of passing the VG from suspend to resume in clvmd. Since in the case of clvmd one caller can't simply pass the same VG to both suspend and resume, suspend needs to stash the VG somewhere that resume can grab it from. (resume doesn't want to read it from disk since devices are suspended.) The lvmcache vginfo struct is used as a convenient place to stash the VG to pass it from suspend to resume, even though it isn't related to the lvmcache or vginfo. These suspended_vg* vginfo fields should not be used or touched anywhere else, they are only to be used for passing the VG data from suspend to resume in clvmd. The VG data being passed between suspend and resume is never modified, and will only exist in the brief period between suspend and resume in clvmd. suspend has both old (current) and new (precommitted) copies of the VG metadata. It stashes both of these in the vginfo prior to suspending devices. When vg_commit is successful, it sets a flag in vginfo as before, signaling the transition from old to new metadata. resume grabs the VG stashed by suspend. If the vg_commit happened, it grabs the new VG, and if the vg_commit didn't happen it grabs the old VG. The VG is then used to resume LVs. This isolates clvmd-specific code and usage from the normal lvm vg_read code, making the code simpler and the behavior easier to verify. Sequence of operations: - lv_suspend() has both vg_old and vg_new and stashes a copy of each onto the vginfo: lvmcache_save_suspended_vg(vg_old); lvmcache_save_suspended_vg(vg_new); - vg_commit() happens, which causes all clvmd instances to call lvmcache_commit_metadata(vg). A flag is set in the vginfo indicating the transition from the old to new VG: vginfo->suspended_vg_committed = 1; - lv_resume() needs either vg_old or vg_new to use in resuming LVs. It doesn't want to read the VG from disk since devices are suspended, so it gets the VG stashed by lv_suspend: vg = lvmcache_get_suspended_vg(vgid); If the vg_commit did not happen, suspended_vg_committed will not be set, and in this case, lvmcache_get_suspended_vg() will return the old VG instead of the new VG, and it will resume LVs based on the old metadata.
264 lines
7.7 KiB
C
264 lines
7.7 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 "dev-cache.h"
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#include "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 test;
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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 scan_size_kb;
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const char *msg_prefix;
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const char *fmt_name;
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uint64_t unit_factor;
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int cmd_name; /* Show command name? */
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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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/*
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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 ignore_clustered_vgs:1;
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unsigned threaded:1; /* set if running within a thread e.g. clvmd */
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unsigned independent_metadata_areas:1; /* active formats have MDAs outside PVs */
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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_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 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_rescan: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: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 use_aio:1;
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unsigned pvscan_cache_single:1;
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/*
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* Filtering.
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*/
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struct dev_filter *lvmetad_filter; /* pre-lvmetad filter chain */
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struct dev_filter *filter; /* post-lvmetad filter chain */
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struct dev_filter *full_filter; /* lvmetad_filter + filter */
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int dump_filter; /* Dump filter when exiting? */
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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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/*
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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 unused_duplicate_devs; /* save preferences between lvmcache instances */
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struct dev_async_context *ac; /* for async i/o */
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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_long_lived,
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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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