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lvm2/lib/config/config.h
David Teigland 904e1e3d26 Place the first PE at 1 MiB for all defaults 
. When using default settings, this commit should change
  nothing.  The first PE continues to be placed at 1 MiB
  resulting in a metadata area size of 1020 KiB (for
  4K page sizes; slightly smaller for larger page sizes.)

. When default_data_alignment is disabled in lvm.conf,
  align pe_start at 1 MiB, based on a default metadata area
  size that adapts to the page size.  Previously, disabling
  this option would result in mda_size that was too small
  for common use, and produced a 64 KiB aligned pe_start.

. Customized pe_start and mda_size values continue to be
  set as before in lvm.conf and command line.

. Remove the configure option for setting default_data_alignment
  at build time.

. Improve alignment related option descriptions.

. Add section about alignment to pvcreate man page.

Previously, DEFAULT_PVMETADATASIZE was 255 sectors.
However, the fact that the config setting named
"default_data_alignment" has a default value of 1 (MiB)
meant that DEFAULT_PVMETADATASIZE was having no effect.

The metadata area size is the space between the start of
the metadata area (page size offset from the start of the
device) and the first PE (1 MiB by default due to
default_data_alignment 1.)  The result is a 1020 KiB metadata
area on machines with 4KiB page size (1024 KiB - 4 KiB),
and smaller on machines with larger page size.

If default_data_alignment was set to 0 (disabled), then
DEFAULT_PVMETADATASIZE 255 would take effect, and produce a
metadata area that was 188 KiB and pe_start of 192 KiB.
This was too small for common use.

This is fixed by making the default metadata area size a
computed value that matches the value produced by
default_data_alignment.
2018-11-26 16:36:50 -06:00

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/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2007 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_CONFIG_H
#define _LVM_CONFIG_H
#include "device_mapper/all.h"
#include "lib/device/device.h"
/* 16 bits: 3 bits for major, 4 bits for minor, 9 bits for patchlevel */
/* FIXME Max LVM version supported: 7.15.511. Extend bits when needed. */
#define vsn(major, minor, patchlevel) (major << 13 | minor << 9 | patchlevel)
struct cmd_context;
typedef enum {
CONFIG_UNDEFINED, /* undefined/uninitialized config */
CONFIG_FILE, /* one file config */
CONFIG_MERGED_FILES, /* config that is a result of merging more config files */
CONFIG_STRING, /* config string typed on cmdline using '--config' arg */
CONFIG_PROFILE_COMMAND, /* command profile config */
CONFIG_PROFILE_METADATA,/* metadata profile config */
CONFIG_FILE_SPECIAL /* special purpose file config (e.g. metadata, persistent filter...) */
} config_source_t;
struct profile {
struct dm_list list;
config_source_t source; /* either CONFIG_PROFILE_COMMAND or CONFIG_PROFILE_METADATA */
const char *name;
struct dm_config_tree *cft;
};
struct profile_params {
char dir[PATH_MAX]; /* subdir in LVM_SYSTEM_DIR where LVM looks for profiles */
struct profile *global_command_profile; /* profile (as given by --commandprofile cmd arg) used as global command profile */
struct profile *global_metadata_profile; /* profile (as given by --metadataprofile cmd arg) that overrides any other VG/LV-based profile */
struct dm_list profiles_to_load; /* list of profiles which are only added, but still need to be loaded for any use */
struct dm_list profiles; /* list of profiles which are loaded already and which are ready for use */
struct profile *shell_profile; /* master profile used in interactive/shell mode */
};
#define CFG_PATH_MAX_LEN 128
/*
* Structures used for definition of a configuration tree.
*/
/* configuration definition item type (for item's accepted types) */
typedef enum {
CFG_TYPE_SECTION = 1 << 0, /* section */
CFG_TYPE_ARRAY = 1 << 1, /* setting */
CFG_TYPE_BOOL = 1 << 2, /* setting */
CFG_TYPE_INT = 1 << 3, /* setting */
CFG_TYPE_FLOAT = 1 << 4, /* setting */
CFG_TYPE_STRING = 1 << 5, /* setting */
} cfg_def_type_t;
/* function types to evaluate default value at runtime */
typedef int (*t_fn_CFG_TYPE_BOOL) (struct cmd_context *cmd, struct profile *profile);
typedef int (*t_fn_CFG_TYPE_INT) (struct cmd_context *cmd, struct profile *profile);
typedef float (*t_fn_CFG_TYPE_FLOAT) (struct cmd_context *cmd, struct profile *profile);
typedef const char* (*t_fn_CFG_TYPE_STRING) (struct cmd_context *cmd, struct profile *profile);
typedef const char* (*t_fn_CFG_TYPE_ARRAY) (struct cmd_context *cmd, struct profile *profile);
typedef const char* (*t_fn_UNCONFIGURED) (struct cmd_context *cmd);
/* configuration definition item value (for item's default value) */
typedef union {
/* static value - returns a variable */
const int v_CFG_TYPE_BOOL, v_CFG_TYPE_INT;
const float v_CFG_TYPE_FLOAT;
const char *v_CFG_TYPE_STRING, *v_CFG_TYPE_ARRAY;
/* run-time value - evaluates a function */
t_fn_CFG_TYPE_BOOL fn_CFG_TYPE_BOOL;
t_fn_CFG_TYPE_INT fn_CFG_TYPE_INT;
t_fn_CFG_TYPE_FLOAT fn_CFG_TYPE_FLOAT;
t_fn_CFG_TYPE_STRING fn_CFG_TYPE_STRING;
t_fn_CFG_TYPE_ARRAY fn_CFG_TYPE_ARRAY;
} cfg_def_value_t;
typedef union {
const char *v_UNCONFIGURED;
t_fn_UNCONFIGURED fn_UNCONFIGURED;
} cfg_def_unconfigured_value_t;
/* configuration definition item flags: */
/* whether the configuration item name is variable */
#define CFG_NAME_VARIABLE 0x0001
/* whether empty value is allowed */
#define CFG_ALLOW_EMPTY 0x0002
/* whether the configuration item is for advanced use only */
#define CFG_ADVANCED 0x0004
/* whether the configuration item is not officially supported */
#define CFG_UNSUPPORTED 0x0008
/* whether the configuration item is customizable by a profile */
#define CFG_PROFILABLE 0x0010
/* whether the configuration item is customizable by a profile
* and whether it can be attached to VG/LV metadata at the same time
* The CFG_PROFILABLE_METADATA flag incorporates CFG_PROFILABLE flag!!! */
#define CFG_PROFILABLE_METADATA 0x0030
/* whether the default value is undefned */
#define CFG_DEFAULT_UNDEFINED 0x0040
/* whether the default value is commented out on output */
#define CFG_DEFAULT_COMMENTED 0x0080
/* whether the default value is calculated during run time */
#define CFG_DEFAULT_RUN_TIME 0x0100
/* whether the configuration setting is disabled (and hence defaults always used) */
#define CFG_DISABLED 0x0200
/* whether to print integers in octal form (prefixed by "0") */
#define CFG_FORMAT_INT_OCTAL 0x0400
/* whether to disable checks for the whole config section subtree */
#define CFG_SECTION_NO_CHECK 0x0800
/* whether to disallow a possibility to override configuration
* setting for commands run interactively (e.g. in lvm shell) */
#define CFG_DISALLOW_INTERACTIVE 0x1000
/* configuration definition item structure */
typedef struct cfg_def_item {
int id; /* ID of this item */
int parent; /* ID of parent item */
const char *name; /* name of the item in configuration tree */
int type; /* configuration item type (bits of cfg_def_type_t) */
cfg_def_value_t default_value; /* default value (only for settings) */
uint16_t flags; /* configuration item definition flags */
uint16_t since_version; /* version this item appeared in */
cfg_def_unconfigured_value_t default_unconfigured_value; /* default value in terms of @FOO@, pre-configured (only for settings) */
uint16_t deprecated_since_version; /* version since this item is deprecated */
const char *deprecation_comment; /* comment about reasons for deprecation and settings that supersede this one */
const char *comment; /* comment */
const char *file_premable; /* comment text to use at the start of the file */
} cfg_def_item_t;
/* configuration definition tree types */
typedef enum {
CFG_DEF_TREE_CURRENT, /* tree of nodes with values currently set in the config */
CFG_DEF_TREE_MISSING, /* tree of nodes missing in current config using default values */
CFG_DEF_TREE_FULL, /* CURRENT + MISSING, the tree actually used within execution */
CFG_DEF_TREE_DEFAULT, /* tree of all possible config nodes with default values */
CFG_DEF_TREE_NEW, /* tree of all new nodes that appeared in given version */
CFG_DEF_TREE_NEW_SINCE, /* tree of all new nodes that appeared since given version */
CFG_DEF_TREE_PROFILABLE, /* tree of all nodes that are customizable by profiles */
CFG_DEF_TREE_PROFILABLE_CMD, /* tree of all nodes that are customizable by command profiles (subset of PROFILABLE) */
CFG_DEF_TREE_PROFILABLE_MDA, /* tree of all nodes that are customizable by metadata profiles (subset of PROFILABLE) */
CFG_DEF_TREE_DIFF, /* tree of all nodes that differ from defaults */
CFG_DEF_TREE_LIST, /* list all nodes */
} cfg_def_tree_t;
/* configuration definition tree specification */
struct config_def_tree_spec {
struct cmd_context *cmd; /* command context (for run-time defaults */
struct dm_config_tree *current_cft; /* current config tree which is defined explicitly - defaults are not used */
cfg_def_tree_t type; /* tree type */
uint16_t version; /* tree at this LVM2 version */
unsigned ignoreadvanced:1; /* do not include advanced configs */
unsigned ignoreunsupported:1; /* do not include unsupported configs */
unsigned ignoredeprecated:1; /* do not include deprecated configs */
unsigned ignorelocal:1; /* do not include the local section */
unsigned withsummary:1; /* include first line of comments - a summary */
unsigned withcomments:1; /* include all comment lines */
unsigned withversions:1; /* include versions */
unsigned withspaces:1; /* add more spaces in output for better readability */
unsigned unconfigured:1; /* use unconfigured path strings */
unsigned withgeneralpreamble:1; /* include preamble for a general config file */
unsigned withlocalpreamble:1; /* include preamble for a local config file */
uint8_t *check_status; /* status of last tree check (currently needed for CFG_DEF_TREE_MISSING only) */
};
/* flag to mark the item as used in a config tree instance during validation */
#define CFG_USED 0x01
/* flag to mark the item as valid in a config tree instance during validation */
#define CFG_VALID 0x02
/* flag to mark the item as having the value different from default one */
#define CFG_DIFF 0x04
/*
* Register ID for each possible item in the configuration tree.
*/
enum {
#define cfg_section(id, name, parent, flags, since_version, deprecated_since_version, deprecation_comment, comment) id,
#define cfg(id, name, parent, flags, type, default_value, since_version, unconfigured_value, deprecated_since_version, deprecation_comment, comment) id,
#define cfg_runtime(id, name, parent, flags, type, since_version, deprecated_since_version, deprecation_comment, comment) id,
#define cfg_array(id, name, parent, flags, types, default_value, since_version, unconfigured_value, deprecated_since_version, deprecation_comment, comment) id,
#define cfg_array_runtime(id, name, parent, flags, types, since_version, deprecated_since_version, deprecation_comment, comment) id,
#include "lib/config/config_settings.h"
#undef cfg_section
#undef cfg
#undef cfg_runtime
#undef cfg_array
#undef cfg_array_runtime
};
struct profile *add_profile(struct cmd_context *cmd, const char *profile_name, config_source_t source);
int load_profile(struct cmd_context *cmd, struct profile *profile);
int load_pending_profiles(struct cmd_context *cmd);
/* configuration check handle for each instance of the validation check */
struct cft_check_handle {
struct cmd_context *cmd; /* command context */
struct dm_config_tree *cft; /* the tree for which the check is done */
config_source_t source; /* configuration source */
unsigned force_check:1; /* force check even if disabled by config/checks setting */
unsigned skip_if_checked:1; /* skip the check if already done before - return last state */
unsigned suppress_messages:1; /* suppress messages during the check if config item is found invalid */
unsigned check_diff:1; /* check if the value used differs from default one */
unsigned ignoreadvanced:1; /* do not include advnced configs */
unsigned ignoreunsupported:1; /* do not include unsupported configs */
uint16_t disallowed_flags; /* set of disallowed flags */
uint8_t status[CFG_COUNT]; /* flags for each configuration item - the result of the check */
};
int config_def_get_path(char *buf, size_t buf_size, int id);
/* Checks config using given handle - the handle may be reused. */
int config_def_check(struct cft_check_handle *handle);
/* Forces config check and automatically creates a new handle inside with defaults and discards the handle after the check. */
int config_force_check(struct cmd_context *cmd, config_source_t source, struct dm_config_tree *cft);
int override_config_tree_from_string(struct cmd_context *cmd, const char *config_settings);
int override_config_tree_from_profile(struct cmd_context *cmd, struct profile *profile);
struct dm_config_tree *get_config_tree_by_source(struct cmd_context *, config_source_t source);
struct dm_config_tree *remove_config_tree_by_source(struct cmd_context *cmd, config_source_t source);
struct cft_check_handle *get_config_tree_check_handle(struct cmd_context *cmd, struct dm_config_tree *cft);
config_source_t config_get_source_type(struct dm_config_tree *cft);
typedef uint32_t (*checksum_fn_t) (uint32_t initial, const uint8_t *buf, uint32_t size);
struct dm_config_tree *config_open(config_source_t source, const char *filename, int keep_open);
int config_file_read_fd(struct dm_config_tree *cft, struct device *dev, dev_io_reason_t reason,
off_t offset, size_t size, off_t offset2, size_t size2,
checksum_fn_t checksum_fn, uint32_t checksum,
int skip_parse, int no_dup_node_check);
int config_file_read(struct dm_config_tree *cft);
struct dm_config_tree *config_file_open_and_read(const char *config_file, config_source_t source,
struct cmd_context *cmd);
int config_write(struct dm_config_tree *cft, struct config_def_tree_spec *tree_spec,
const char *file, int argc, char **argv);
struct dm_config_tree *config_def_create_tree(struct config_def_tree_spec *spec);
void config_destroy(struct dm_config_tree *cft);
struct timespec config_file_timestamp(struct dm_config_tree *cft);
int config_file_changed(struct dm_config_tree *cft);
int config_file_check(struct dm_config_tree *cft, const char **filename, struct stat *info);
typedef enum {
CONFIG_MERGE_TYPE_RAW, /* always replace old config values with new config values when merging */
CONFIG_MERGE_TYPE_TAGS /* apply some exceptions when merging tag configs:
- skip tags section
- do not replace, but merge values of these settings:
activation/volume_list
devices/filter
devices/types
*/
} config_merge_t;
int merge_config_tree(struct cmd_context *cmd, struct dm_config_tree *cft,
struct dm_config_tree *newdata, config_merge_t);
/*
* The next two do not check config overrides and must only be used for the tags section.
*/
const struct dm_config_node *find_config_node(struct cmd_context *cmd, struct dm_config_tree *cft, int id);
int find_config_bool(struct cmd_context *cmd, struct dm_config_tree *cft, int id);
/*
* These versions check an override tree, if present, first.
*/
const struct dm_config_node *find_config_tree_node(struct cmd_context *cmd, int id, struct profile *profile);
const char *find_config_tree_str(struct cmd_context *cmd, int id, struct profile *profile);
const char *find_config_tree_str_allow_empty(struct cmd_context *cmd, int id, struct profile *profile);
int find_config_tree_int(struct cmd_context *cmd, int id, struct profile *profile);
int64_t find_config_tree_int64(struct cmd_context *cmd, int id, struct profile *profile);
float find_config_tree_float(struct cmd_context *cmd, int id, struct profile *profile);
int find_config_tree_bool(struct cmd_context *cmd, int id, struct profile *profile);
const struct dm_config_node *find_config_tree_array(struct cmd_context *cmd, int id, struct profile *profile);
/*
* Functions for configuration settings for which the default
* value is evaluated at runtime based on command context.
*/
const char *get_default_devices_cache_dir_CFG(struct cmd_context *cmd, struct profile *profile);
const char *get_default_unconfigured_devices_cache_dir_CFG(struct cmd_context *cmd);
const char *get_default_devices_cache_CFG(struct cmd_context *cmd, struct profile *profile);
const char *get_default_unconfigured_devices_cache_CFG(struct cmd_context *cmd);
const char *get_default_backup_backup_dir_CFG(struct cmd_context *cmd, struct profile *profile);
const char *get_default_unconfigured_backup_backup_dir_CFG(struct cmd_context *cmd);
const char *get_default_backup_archive_dir_CFG(struct cmd_context *cmd, struct profile *profile);
const char *get_default_unconfigured_backup_archive_dir_CFG(struct cmd_context *cmd);
const char *get_default_config_profile_dir_CFG(struct cmd_context *cmd, struct profile *profile);
const char *get_default_unconfigured_config_profile_dir_CFG(struct cmd_context *cmd);
const char *get_default_activation_mirror_image_fault_policy_CFG(struct cmd_context *cmd, struct profile *profile);
#define get_default_unconfigured_activation_mirror_image_fault_policy_CFG NULL
int get_default_allocation_thin_pool_chunk_size_CFG(struct cmd_context *cmd, struct profile *profile);
#define get_default_unconfigured_allocation_thin_pool_chunk_size_CFG NULL
int get_default_allocation_cache_pool_chunk_size_CFG(struct cmd_context *cmd, struct profile *profile);
#define get_default_unconfigured_allocation_cache_pool_chunk_size_CFG NULL
const char *get_default_allocation_cache_policy_CFG(struct cmd_context *cmd, struct profile *profile);
#define get_default_unconfigured_allocation_cache_policy_CFG NULL
uint64_t get_default_allocation_cache_pool_max_chunks_CFG(struct cmd_context *cmd, struct profile *profile);
int get_default_metadata_pvmetadatasize_CFG(struct cmd_context *cmd, struct profile *profile);
#define get_default_unconfigured_metadata_pvmetadatasize_CFG NULL
#endif
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