/* * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved. * Copyright (C) 2004-2014 Red Hat, Inc. All rights reserved. * * This file is part of the device-mapper userspace tools. * * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef LIB_DEVICE_MAPPER_H #define LIB_DEVICE_MAPPER_H #include #include #include #include #ifdef __linux__ # include #endif #include #include #include #include #ifndef __GNUC__ # define __typeof__ typeof #endif /* Macros to make string defines */ #define DM_TO_STRING_EXP(A) #A #define DM_TO_STRING(A) DM_TO_STRING_EXP(A) #define DM_ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) #ifdef __cplusplus extern "C" { #endif /***************************************************************** * The first section of this file provides direct access to the * individual device-mapper ioctls. Since it is quite laborious to * build the ioctl arguments for the device-mapper, people are * encouraged to use this library. ****************************************************************/ /* * The library user may wish to register their own * logging function. By default errors go to stderr. * Use dm_log_with_errno_init(NULL) to restore the default log fn. * Error messages may have a non-zero errno. * Debug messages may have a non-zero class. * Aborts on internal error when env DM_ABORT_ON_INTERNAL_ERRORS is 1 */ typedef void (*dm_log_with_errno_fn) (int level, const char *file, int line, int dm_errno_or_class, const char *f, ...) __attribute__ ((format(printf, 5, 6))); void dm_log_with_errno_init(dm_log_with_errno_fn fn); void dm_log_init_verbose(int level); /* * Original version of this function. * dm_errno is set to 0. * * Deprecated: Use the _with_errno_ versions above instead. */ typedef void (*dm_log_fn) (int level, const char *file, int line, const char *f, ...) __attribute__ ((format(printf, 4, 5))); void dm_log_init(dm_log_fn fn); /* * For backward-compatibility, indicate that dm_log_init() was used * to set a non-default value of dm_log(). */ int dm_log_is_non_default(void); /* * Number of devices currently in suspended state (via the library). */ int dm_get_suspended_counter(void); enum { DM_DEVICE_CREATE, DM_DEVICE_RELOAD, DM_DEVICE_REMOVE, DM_DEVICE_REMOVE_ALL, DM_DEVICE_SUSPEND, DM_DEVICE_RESUME, DM_DEVICE_INFO, DM_DEVICE_DEPS, DM_DEVICE_RENAME, DM_DEVICE_VERSION, DM_DEVICE_STATUS, DM_DEVICE_TABLE, DM_DEVICE_WAITEVENT, DM_DEVICE_LIST, DM_DEVICE_CLEAR, DM_DEVICE_MKNODES, DM_DEVICE_LIST_VERSIONS, DM_DEVICE_TARGET_MSG, DM_DEVICE_SET_GEOMETRY }; /* * You will need to build a struct dm_task for * each ioctl command you want to execute. */ struct dm_task; struct dm_task *dm_task_create(int type); void dm_task_destroy(struct dm_task *dmt); int dm_task_set_name(struct dm_task *dmt, const char *name); int dm_task_set_uuid(struct dm_task *dmt, const char *uuid); /* * Retrieve attributes after an info. */ struct dm_info { int exists; int suspended; int live_table; int inactive_table; int32_t open_count; uint32_t event_nr; uint32_t major; uint32_t minor; /* minor device number */ int read_only; /* 0:read-write; 1:read-only */ int32_t target_count; int deferred_remove; }; struct dm_deps { uint32_t count; uint32_t filler; uint64_t device[0]; }; struct dm_names { uint64_t dev; uint32_t next; /* Offset to next struct from start of this struct */ char name[0]; }; struct dm_versions { uint32_t next; /* Offset to next struct from start of this struct */ uint32_t version[3]; char name[0]; }; int dm_get_library_version(char *version, size_t size); int dm_task_get_driver_version(struct dm_task *dmt, char *version, size_t size); #define dm_task_get_info dm_task_get_info_with_deferred_remove int dm_task_get_info(struct dm_task *dmt, struct dm_info *dmi); /* * This function returns dm device's UUID based on the value * of the mangling mode set during preceding dm_task_run call: * - unmangled UUID for DM_STRING_MANGLING_{AUTO, HEX}, * - UUID without any changes for DM_STRING_MANGLING_NONE. * * To get mangled or unmangled form of the UUID directly, use * dm_task_get_uuid_mangled or dm_task_get_uuid_unmangled function. */ const char *dm_task_get_uuid(const struct dm_task *dmt); struct dm_deps *dm_task_get_deps(struct dm_task *dmt); struct dm_versions *dm_task_get_versions(struct dm_task *dmt); const char *dm_task_get_message_response(struct dm_task *dmt); /* * These functions return device-mapper names based on the value * of the mangling mode set during preceding dm_task_run call: * - unmangled name for DM_STRING_MANGLING_{AUTO, HEX}, * - name without any changes for DM_STRING_MANGLING_NONE. * * To get mangled or unmangled form of the name directly, use * dm_task_get_name_mangled or dm_task_get_name_unmangled function. */ const char *dm_task_get_name(const struct dm_task *dmt); struct dm_names *dm_task_get_names(struct dm_task *dmt); int dm_task_set_ro(struct dm_task *dmt); int dm_task_set_newname(struct dm_task *dmt, const char *newname); int dm_task_set_newuuid(struct dm_task *dmt, const char *newuuid); int dm_task_set_minor(struct dm_task *dmt, int minor); int dm_task_set_major(struct dm_task *dmt, int major); int dm_task_set_major_minor(struct dm_task *dmt, int major, int minor, int allow_default_major_fallback); int dm_task_set_uid(struct dm_task *dmt, uid_t uid); int dm_task_set_gid(struct dm_task *dmt, gid_t gid); int dm_task_set_mode(struct dm_task *dmt, mode_t mode); int dm_task_set_cookie(struct dm_task *dmt, uint32_t *cookie, uint16_t flags); int dm_task_set_event_nr(struct dm_task *dmt, uint32_t event_nr); int dm_task_set_geometry(struct dm_task *dmt, const char *cylinders, const char *heads, const char *sectors, const char *start); int dm_task_set_message(struct dm_task *dmt, const char *message); int dm_task_set_sector(struct dm_task *dmt, uint64_t sector); int dm_task_no_flush(struct dm_task *dmt); int dm_task_no_open_count(struct dm_task *dmt); int dm_task_skip_lockfs(struct dm_task *dmt); int dm_task_query_inactive_table(struct dm_task *dmt); int dm_task_suppress_identical_reload(struct dm_task *dmt); int dm_task_secure_data(struct dm_task *dmt); int dm_task_retry_remove(struct dm_task *dmt); int dm_task_deferred_remove(struct dm_task *dmt); /* * Enable checks for common mistakes such as issuing ioctls in an unsafe order. */ int dm_task_enable_checks(struct dm_task *dmt); typedef enum { DM_ADD_NODE_ON_RESUME, /* add /dev/mapper node with dmsetup resume */ DM_ADD_NODE_ON_CREATE /* add /dev/mapper node with dmsetup create */ } dm_add_node_t; int dm_task_set_add_node(struct dm_task *dmt, dm_add_node_t add_node); /* * Control read_ahead. */ #define DM_READ_AHEAD_AUTO UINT32_MAX /* Use kernel default readahead */ #define DM_READ_AHEAD_NONE 0 /* Disable readahead */ #define DM_READ_AHEAD_MINIMUM_FLAG 0x1 /* Value supplied is minimum */ /* * Read ahead is set with DM_DEVICE_CREATE with a table or DM_DEVICE_RESUME. */ int dm_task_set_read_ahead(struct dm_task *dmt, uint32_t read_ahead, uint32_t read_ahead_flags); uint32_t dm_task_get_read_ahead(const struct dm_task *dmt, uint32_t *read_ahead); /* * Use these to prepare for a create or reload. */ int dm_task_add_target(struct dm_task *dmt, uint64_t start, uint64_t size, const char *ttype, const char *params); /* * Format major/minor numbers correctly for input to driver. */ #define DM_FORMAT_DEV_BUFSIZE 13 /* Minimum bufsize to handle worst case. */ int dm_format_dev(char *buf, int bufsize, uint32_t dev_major, uint32_t dev_minor); /* Use this to retrive target information returned from a STATUS call */ void *dm_get_next_target(struct dm_task *dmt, void *next, uint64_t *start, uint64_t *length, char **target_type, char **params); /* * Parse params from STATUS call for raid target */ struct dm_pool; /* * dm_get_status_raid will allocate the dm_status_raid structure and * the necessary character arrays from the mempool provided to the * function. If the mempool is from a dev_manager struct (dm->mem), * then the caller does not need to free the memory - simply calling * dev_manager_destroy will do. */ struct dm_status_raid { uint64_t reserved; uint64_t total_regions; uint64_t insync_regions; uint64_t mismatch_count; uint32_t dev_count; char *raid_type; char *dev_health; char *sync_action; }; int dm_get_status_raid(struct dm_pool *mem, const char *params, struct dm_status_raid **status); struct dm_status_cache { uint64_t version; /* zero for now */ uint32_t metadata_block_size; /* in 512B sectors */ uint32_t block_size; /* AKA 'chunk_size' */ uint64_t metadata_used_blocks; uint64_t metadata_total_blocks; uint64_t used_blocks; uint64_t dirty_blocks; uint64_t total_blocks; uint64_t read_hits; uint64_t read_misses; uint64_t write_hits; uint64_t write_misses; uint64_t demotions; uint64_t promotions; uint64_t feature_flags; int core_argc; char **core_argv; char *policy_name; int policy_argc; char **policy_argv; }; int dm_get_status_cache(struct dm_pool *mem, const char *params, struct dm_status_cache **status); /* * Snapshot target's format: * <= 1.7.0: / * >= 1.8.0: / */ struct dm_status_snapshot { uint64_t used_sectors; /* in 512b units */ uint64_t total_sectors; uint64_t metadata_sectors; unsigned has_metadata_sectors : 1; /* set when metadata_sectors is present */ unsigned invalid : 1; /* set when snapshot is invalidated */ unsigned merge_failed : 1; /* set when snapshot merge failed */ }; int dm_get_status_snapshot(struct dm_pool *mem, const char *params, struct dm_status_snapshot **status); /* * Parse params from STATUS call for thin_pool target */ typedef enum { DM_THIN_DISCARDS_IGNORE, DM_THIN_DISCARDS_NO_PASSDOWN, DM_THIN_DISCARDS_PASSDOWN } dm_thin_discards_t; struct dm_status_thin_pool { uint64_t transaction_id; uint64_t used_metadata_blocks; uint64_t total_metadata_blocks; uint64_t used_data_blocks; uint64_t total_data_blocks; uint64_t held_metadata_root; uint32_t read_only; /* metadata may not be changed */ dm_thin_discards_t discards; uint32_t fail : 1; /* all I/O fails */ uint32_t error_if_no_space : 1; /* otherwise queue_if_no_space */ uint32_t out_of_data_space : 1; /* metadata may be changed, but data may not be allocated */ uint32_t reserved : 29; }; int dm_get_status_thin_pool(struct dm_pool *mem, const char *params, struct dm_status_thin_pool **status); /* * Parse params from STATUS call for thin target */ struct dm_status_thin { uint64_t mapped_sectors; uint64_t highest_mapped_sector; }; int dm_get_status_thin(struct dm_pool *mem, const char *params, struct dm_status_thin **status); /* * Call this to actually run the ioctl. */ int dm_task_run(struct dm_task *dmt); /* * Call this to make or remove the device nodes associated with previously * issued commands. */ void dm_task_update_nodes(void); /* * Mangling support * * Character whitelist: 0-9, A-Z, a-z, #+-.:=@_ * HEX mangling format: \xNN, NN being the hex value of the character. * (whitelist and format supported by udev) */ typedef enum { DM_STRING_MANGLING_NONE, /* do not mangle at all */ DM_STRING_MANGLING_AUTO, /* mangle only if not already mangled with hex, error when mixed */ DM_STRING_MANGLING_HEX /* always mangle with hex encoding, no matter what the input is */ } dm_string_mangling_t; /* * Set/get mangling mode used for device-mapper names and uuids. */ int dm_set_name_mangling_mode(dm_string_mangling_t name_mangling); dm_string_mangling_t dm_get_name_mangling_mode(void); /* * Get mangled/unmangled form of the device-mapper name or uuid * irrespective of the global setting (set by dm_set_name_mangling_mode). * The name or uuid returned needs to be freed after use by calling dm_free! */ char *dm_task_get_name_mangled(const struct dm_task *dmt); char *dm_task_get_name_unmangled(const struct dm_task *dmt); char *dm_task_get_uuid_mangled(const struct dm_task *dmt); char *dm_task_get_uuid_unmangled(const struct dm_task *dmt); /* * Configure the device-mapper directory */ int dm_set_dev_dir(const char *dir); const char *dm_dir(void); /* * Configure sysfs directory, /sys by default */ int dm_set_sysfs_dir(const char *dir); const char *dm_sysfs_dir(void); /* * Configure default UUID prefix string. * Conventionally this is a short capitalised prefix indicating the subsystem * that is managing the devices, e.g. "LVM-" or "MPATH-". * To support stacks of devices from different subsystems, recursive functions * stop recursing if they reach a device with a different prefix. */ int dm_set_uuid_prefix(const char *uuid_prefix); const char *dm_uuid_prefix(void); /* * Determine whether a major number belongs to device-mapper or not. */ int dm_is_dm_major(uint32_t major); /* * Get associated device name for given major and minor number by reading * the sysfs content. If this is a dm device, get associated dm name, the one * that appears in /dev/mapper. DM names could be resolved this way only if * kernel used >= 2.6.29, kernel name is found otherwise (e.g. dm-0). * If prefer_kernel_name is set, the kernel name is always preferred over * device-mapper name for dm devices no matter what the kernel version is. * For non-dm devices, we always get associated kernel name, e.g sda, md0 etc. * Returns 0 on error or if sysfs is not used (or configured incorrectly), * otherwise returns 1 and the supplied buffer holds the device name. */ int dm_device_get_name(uint32_t major, uint32_t minor, int prefer_kernel_name, char *buf, size_t buf_size); /* * Determine whether a device has any holders (devices * using this device). If sysfs is not used (or configured * incorrectly), returns 0. */ int dm_device_has_holders(uint32_t major, uint32_t minor); /* * Determine whether a device contains mounted filesystem. * If sysfs is not used (or configured incorrectly), returns 0. */ int dm_device_has_mounted_fs(uint32_t major, uint32_t minor); /* * Callback is invoked for individal mountinfo lines, * minor, major and mount target are parsed and unmangled. */ typedef int (*dm_mountinfo_line_callback_fn) (char *line, unsigned maj, unsigned min, char *target, void *cb_data); /* * Read all lines from /proc/self/mountinfo, * for each line calls read_fn callback. */ int dm_mountinfo_read(dm_mountinfo_line_callback_fn read_fn, void *cb_data); /* * Initialise library */ void dm_lib_init(void) __attribute__((constructor)); /* * Release library resources */ void dm_lib_release(void); void dm_lib_exit(void) __attribute__((destructor)); /* * Use NULL for all devices. */ int dm_mknodes(const char *name); int dm_driver_version(char *version, size_t size); /****************************************************** * Functions to build and manipulate trees of devices * ******************************************************/ struct dm_tree; struct dm_tree_node; /* * Initialise an empty dependency tree. * * The tree consists of a root node together with one node for each mapped * device which has child nodes for each device referenced in its table. * * Every node in the tree has one or more children and one or more parents. * * The root node is the parent/child of every node that doesn't have other * parents/children. */ struct dm_tree *dm_tree_create(void); void dm_tree_free(struct dm_tree *tree); /* * List of suffixes to be ignored when matching uuids against existing devices. */ void dm_tree_set_optional_uuid_suffixes(struct dm_tree *dtree, const char **optional_uuid_suffixes); /* * Add nodes to the tree for a given device and all the devices it uses. */ int dm_tree_add_dev(struct dm_tree *tree, uint32_t major, uint32_t minor); int dm_tree_add_dev_with_udev_flags(struct dm_tree *tree, uint32_t major, uint32_t minor, uint16_t udev_flags); /* * Add a new node to the tree if it doesn't already exist. */ struct dm_tree_node *dm_tree_add_new_dev(struct dm_tree *tree, const char *name, const char *uuid, uint32_t major, uint32_t minor, int read_only, int clear_inactive, void *context); struct dm_tree_node *dm_tree_add_new_dev_with_udev_flags(struct dm_tree *tree, const char *name, const char *uuid, uint32_t major, uint32_t minor, int read_only, int clear_inactive, void *context, uint16_t udev_flags); /* * Search for a node in the tree. * Set major and minor to 0 or uuid to NULL to get the root node. */ struct dm_tree_node *dm_tree_find_node(struct dm_tree *tree, uint32_t major, uint32_t minor); struct dm_tree_node *dm_tree_find_node_by_uuid(struct dm_tree *tree, const char *uuid); /* * Use this to walk through all children of a given node. * Set handle to NULL in first call. * Returns NULL after the last child. * Set inverted to use inverted tree. */ struct dm_tree_node *dm_tree_next_child(void **handle, const struct dm_tree_node *parent, uint32_t inverted); /* * Get properties of a node. */ const char *dm_tree_node_get_name(const struct dm_tree_node *node); const char *dm_tree_node_get_uuid(const struct dm_tree_node *node); const struct dm_info *dm_tree_node_get_info(const struct dm_tree_node *node); void *dm_tree_node_get_context(const struct dm_tree_node *node); int dm_tree_node_size_changed(const struct dm_tree_node *dnode); /* * Returns the number of children of the given node (excluding the root node). * Set inverted for the number of parents. */ int dm_tree_node_num_children(const struct dm_tree_node *node, uint32_t inverted); /* * Deactivate a device plus all dependencies. * Ignores devices that don't have a uuid starting with uuid_prefix. */ int dm_tree_deactivate_children(struct dm_tree_node *dnode, const char *uuid_prefix, size_t uuid_prefix_len); /* * Preload/create a device plus all dependencies. * Ignores devices that don't have a uuid starting with uuid_prefix. */ int dm_tree_preload_children(struct dm_tree_node *dnode, const char *uuid_prefix, size_t uuid_prefix_len); /* * Resume a device plus all dependencies. * Ignores devices that don't have a uuid starting with uuid_prefix. */ int dm_tree_activate_children(struct dm_tree_node *dnode, const char *uuid_prefix, size_t uuid_prefix_len); /* * Suspend a device plus all dependencies. * Ignores devices that don't have a uuid starting with uuid_prefix. */ int dm_tree_suspend_children(struct dm_tree_node *dnode, const char *uuid_prefix, size_t uuid_prefix_len); /* * Skip the filesystem sync when suspending. * Does nothing with other functions. * Use this when no snapshots are involved. */ void dm_tree_skip_lockfs(struct dm_tree_node *dnode); /* * Set the 'noflush' flag when suspending devices. * If the kernel supports it, instead of erroring outstanding I/O that * cannot be completed, the I/O is queued and resubmitted when the * device is resumed. This affects multipath devices when all paths * have failed and queue_if_no_path is set, and mirror devices when * block_on_error is set and the mirror log has failed. */ void dm_tree_use_no_flush_suspend(struct dm_tree_node *dnode); /* * Retry removal of each device if not successful. */ void dm_tree_retry_remove(struct dm_tree_node *dnode); /* * Is the uuid prefix present in the tree? * Only returns 0 if every node was checked successfully. * Returns 1 if the tree walk has to be aborted. */ int dm_tree_children_use_uuid(struct dm_tree_node *dnode, const char *uuid_prefix, size_t uuid_prefix_len); /* * Construct tables for new nodes before activating them. */ int dm_tree_node_add_snapshot_origin_target(struct dm_tree_node *dnode, uint64_t size, const char *origin_uuid); int dm_tree_node_add_snapshot_target(struct dm_tree_node *node, uint64_t size, const char *origin_uuid, const char *cow_uuid, int persistent, uint32_t chunk_size); int dm_tree_node_add_snapshot_merge_target(struct dm_tree_node *node, uint64_t size, const char *origin_uuid, const char *cow_uuid, const char *merge_uuid, uint32_t chunk_size); int dm_tree_node_add_error_target(struct dm_tree_node *node, uint64_t size); int dm_tree_node_add_zero_target(struct dm_tree_node *node, uint64_t size); int dm_tree_node_add_linear_target(struct dm_tree_node *node, uint64_t size); int dm_tree_node_add_striped_target(struct dm_tree_node *node, uint64_t size, uint32_t stripe_size); #define DM_CRYPT_IV_DEFAULT UINT64_C(-1) /* iv_offset == seg offset */ /* * Function accepts one string in cipher specification * (chainmode and iv should be NULL because included in cipher string) * or * separate arguments which will be joined to "cipher-chainmode-iv" */ int dm_tree_node_add_crypt_target(struct dm_tree_node *node, uint64_t size, const char *cipher, const char *chainmode, const char *iv, uint64_t iv_offset, const char *key); int dm_tree_node_add_mirror_target(struct dm_tree_node *node, uint64_t size); /* Mirror log flags */ #define DM_NOSYNC 0x00000001 /* Known already in sync */ #define DM_FORCESYNC 0x00000002 /* Force resync */ #define DM_BLOCK_ON_ERROR 0x00000004 /* On error, suspend I/O */ #define DM_CORELOG 0x00000008 /* In-memory log */ int dm_tree_node_add_mirror_target_log(struct dm_tree_node *node, uint32_t region_size, unsigned clustered, const char *log_uuid, unsigned area_count, uint32_t flags); int dm_tree_node_add_raid_target(struct dm_tree_node *node, uint64_t size, const char *raid_type, uint32_t region_size, uint32_t stripe_size, uint64_t rebuilds, uint64_t flags); /* * Defines bellow are based on kernel's dm-cache.c defines * DM_CACHE_MIN_DATA_BLOCK_SIZE (32 * 1024 >> SECTOR_SHIFT) * DM_CACHE_MAX_DATA_BLOCK_SIZE (1024 * 1024 * 1024 >> SECTOR_SHIFT) */ #define DM_CACHE_MIN_DATA_BLOCK_SIZE (UINT32_C(64)) #define DM_CACHE_MAX_DATA_BLOCK_SIZE (UINT32_C(2097152)) /* * Max supported size for cache pool metadata device. * Limitation is hardcoded into the kernel and bigger device sizes * are not accepted. * * Limit defined in drivers/md/dm-cache-metadata.h */ #define DM_CACHE_METADATA_MAX_SECTORS DM_THIN_METADATA_MAX_SECTORS struct dm_tree_node_raid_params { const char *raid_type; uint32_t stripes; uint32_t mirrors; uint32_t region_size; uint32_t stripe_size; /* * 'rebuilds' and 'writemostly' are bitfields that signify * which devices in the array are to be rebuilt or marked * writemostly. By choosing a 'uint64_t', we limit ourself * to RAID arrays with 64 devices. */ uint64_t rebuilds; uint64_t writemostly; uint32_t writebehind; /* I/Os (kernel default COUNTER_MAX / 2) */ uint32_t sync_daemon_sleep; /* ms (kernel default = 5sec) */ uint32_t max_recovery_rate; /* kB/sec/disk */ uint32_t min_recovery_rate; /* kB/sec/disk */ uint32_t stripe_cache; /* sectors */ uint64_t flags; /* [no]sync */ uint64_t reserved2; }; int dm_tree_node_add_raid_target_with_params(struct dm_tree_node *node, uint64_t size, struct dm_tree_node_raid_params *p); /* Cache feature_flags */ #define DM_CACHE_FEATURE_WRITEBACK 0x00000001 #define DM_CACHE_FEATURE_WRITETHROUGH 0x00000002 #define DM_CACHE_FEATURE_PASSTHROUGH 0x00000004 struct dm_config_node; /* * Use for passing cache policy and all its args e.g.: * * policy_settings { * migration_threshold=2048 * sequention_threashold=100 * ... * } * * For policy without any parameters use NULL. */ int dm_tree_node_add_cache_target(struct dm_tree_node *node, uint64_t size, uint64_t feature_flags, /* DM_CACHE_FEATURE_* */ const char *metadata_uuid, const char *data_uuid, const char *origin_uuid, const char *policy_name, const struct dm_config_node *policy_settings, uint32_t chunk_size); /* * FIXME Add individual cache policy pairs = value, like: * int dm_tree_node_add_cache_policy_arg(struct dm_tree_node *dnode, * const char *key, uint64_t value); */ /* * Replicator operation mode * Note: API for Replicator is not yet stable */ typedef enum { DM_REPLICATOR_SYNC, /* Synchronous replication */ DM_REPLICATOR_ASYNC_WARN, /* Warn if async replicator is slow */ DM_REPLICATOR_ASYNC_STALL, /* Stall replicator if not fast enough */ DM_REPLICATOR_ASYNC_DROP, /* Drop sites out of sync */ DM_REPLICATOR_ASYNC_FAIL, /* Fail replicator if slow */ NUM_DM_REPLICATOR_MODES } dm_replicator_mode_t; int dm_tree_node_add_replicator_target(struct dm_tree_node *node, uint64_t size, const char *rlog_uuid, const char *rlog_type, unsigned rsite_index, dm_replicator_mode_t mode, uint32_t async_timeout, uint64_t fall_behind_data, uint32_t fall_behind_ios); int dm_tree_node_add_replicator_dev_target(struct dm_tree_node *node, uint64_t size, const char *replicator_uuid, /* Replicator control device */ uint64_t rdevice_index, const char *rdev_uuid, /* Rimage device name/uuid */ unsigned rsite_index, const char *slog_uuid, uint32_t slog_flags, /* Mirror log flags */ uint32_t slog_region_size); /* End of Replicator API */ /* * FIXME: Defines bellow are based on kernel's dm-thin.c defines * DATA_DEV_BLOCK_SIZE_MIN_SECTORS (64 * 1024 >> SECTOR_SHIFT) * DATA_DEV_BLOCK_SIZE_MAX_SECTORS (1024 * 1024 * 1024 >> SECTOR_SHIFT) */ #define DM_THIN_MIN_DATA_BLOCK_SIZE (UINT32_C(128)) #define DM_THIN_MAX_DATA_BLOCK_SIZE (UINT32_C(2097152)) /* * Max supported size for thin pool metadata device (17112760320 bytes) * Limitation is hardcoded into the kernel and bigger device size * is not accepted. * drivers/md/dm-thin-metadata.h THIN_METADATA_MAX_SECTORS */ #define DM_THIN_MAX_METADATA_SIZE (UINT64_C(255) * (1 << 14) * (4096 / (1 << 9)) - 256 * 1024) int dm_tree_node_add_thin_pool_target(struct dm_tree_node *node, uint64_t size, uint64_t transaction_id, const char *metadata_uuid, const char *pool_uuid, uint32_t data_block_size, uint64_t low_water_mark, unsigned skip_block_zeroing); /* Supported messages for thin provision target */ typedef enum { DM_THIN_MESSAGE_CREATE_SNAP, /* device_id, origin_id */ DM_THIN_MESSAGE_CREATE_THIN, /* device_id */ DM_THIN_MESSAGE_DELETE, /* device_id */ DM_THIN_MESSAGE_SET_TRANSACTION_ID, /* current_id, new_id */ DM_THIN_MESSAGE_RESERVE_METADATA_SNAP, /* target version >= 1.1 */ DM_THIN_MESSAGE_RELEASE_METADATA_SNAP, /* target version >= 1.1 */ } dm_thin_message_t; int dm_tree_node_add_thin_pool_message(struct dm_tree_node *node, dm_thin_message_t type, uint64_t id1, uint64_t id2); /* * Set thin pool discard features * ignore - Disable support for discards * no_passdown - Don't pass discards down to underlying data device, * just remove the mapping * Feature is available since version 1.1 of the thin target. */ int dm_tree_node_set_thin_pool_discard(struct dm_tree_node *node, unsigned ignore, unsigned no_passdown); /* * Set error if no space, instead of queueing for thin pool. */ int dm_tree_node_set_thin_pool_error_if_no_space(struct dm_tree_node *node, unsigned error_if_no_space); /* * FIXME: Defines bellow are based on kernel's dm-thin.c defines * MAX_DEV_ID ((1 << 24) - 1) */ #define DM_THIN_MAX_DEVICE_ID (UINT32_C((1 << 24) - 1)) int dm_tree_node_add_thin_target(struct dm_tree_node *node, uint64_t size, const char *pool_uuid, uint32_t device_id); int dm_tree_node_set_thin_external_origin(struct dm_tree_node *node, const char *external_uuid); void dm_tree_node_set_udev_flags(struct dm_tree_node *node, uint16_t udev_flags); void dm_tree_node_set_presuspend_node(struct dm_tree_node *node, struct dm_tree_node *presuspend_node); int dm_tree_node_add_target_area(struct dm_tree_node *node, const char *dev_name, const char *dlid, uint64_t offset); /* * Only for temporarily-missing raid devices where changes are tracked. */ int dm_tree_node_add_null_area(struct dm_tree_node *node, uint64_t offset); /* * Set readahead (in sectors) after loading the node. */ void dm_tree_node_set_read_ahead(struct dm_tree_node *dnode, uint32_t read_ahead, uint32_t read_ahead_flags); /* * Set node callback hook before de/activation. * Callback is called before 'activation' of node for activation tree, * or 'deactivation' of node for deactivation tree. */ typedef enum { DM_NODE_CALLBACK_PRELOADED, /* Node has preload deps */ DM_NODE_CALLBACK_DEACTIVATED, /* Node is deactivated */ } dm_node_callback_t; typedef int (*dm_node_callback_fn) (struct dm_tree_node *node, dm_node_callback_t type, void *cb_data); void dm_tree_node_set_callback(struct dm_tree_node *node, dm_node_callback_fn cb, void *cb_data); void dm_tree_set_cookie(struct dm_tree_node *node, uint32_t cookie); uint32_t dm_tree_get_cookie(struct dm_tree_node *node); /***************************************************************************** * Library functions *****************************************************************************/ /******************* * Memory management *******************/ void *dm_malloc_aux(size_t s, const char *file, int line) __attribute__((__malloc__)) __attribute__((__warn_unused_result__)); void *dm_malloc_aux_debug(size_t s, const char *file, int line) __attribute__((__warn_unused_result__)); void *dm_zalloc_aux(size_t s, const char *file, int line) __attribute__((__malloc__)) __attribute__((__warn_unused_result__)); void *dm_zalloc_aux_debug(size_t s, const char *file, int line) __attribute__((__warn_unused_result__)); char *dm_strdup_aux(const char *str, const char *file, int line) __attribute__((__malloc__)) __attribute__((__warn_unused_result__)); void dm_free_aux(void *p); void *dm_realloc_aux(void *p, unsigned int s, const char *file, int line) __attribute__((__warn_unused_result__)); int dm_dump_memory_debug(void); void dm_bounds_check_debug(void); #ifdef DEBUG_MEM # define dm_malloc(s) dm_malloc_aux_debug((s), __FILE__, __LINE__) # define dm_zalloc(s) dm_zalloc_aux_debug((s), __FILE__, __LINE__) # define dm_strdup(s) dm_strdup_aux((s), __FILE__, __LINE__) # define dm_free(p) dm_free_aux(p) # define dm_realloc(p, s) dm_realloc_aux(p, s, __FILE__, __LINE__) # define dm_dump_memory() dm_dump_memory_debug() # define dm_bounds_check() dm_bounds_check_debug() #else # define dm_malloc(s) dm_malloc_aux((s), __FILE__, __LINE__) # define dm_zalloc(s) dm_zalloc_aux((s), __FILE__, __LINE__) # define dm_strdup(s) strdup(s) # define dm_free(p) free(p) # define dm_realloc(p, s) realloc(p, s) # define dm_dump_memory() {} # define dm_bounds_check() {} #endif /* * The pool allocator is useful when you are going to allocate * lots of memory, use the memory for a bit, and then free the * memory in one go. A surprising amount of code has this usage * profile. * * You should think of the pool as an infinite, contiguous chunk * of memory. The front of this chunk of memory contains * allocated objects, the second half is free. dm_pool_alloc grabs * the next 'size' bytes from the free half, in effect moving it * into the allocated half. This operation is very efficient. * * dm_pool_free frees the allocated object *and* all objects * allocated after it. It is important to note this semantic * difference from malloc/free. This is also extremely * efficient, since a single dm_pool_free can dispose of a large * complex object. * * dm_pool_destroy frees all allocated memory. * * eg, If you are building a binary tree in your program, and * know that you are only ever going to insert into your tree, * and not delete (eg, maintaining a symbol table for a * compiler). You can create yourself a pool, allocate the nodes * from it, and when the tree becomes redundant call dm_pool_destroy * (no nasty iterating through the tree to free nodes). * * eg, On the other hand if you wanted to repeatedly insert and * remove objects into the tree, you would be better off * allocating the nodes from a free list; you cannot free a * single arbitrary node with pool. */ struct dm_pool; /* constructor and destructor */ struct dm_pool *dm_pool_create(const char *name, size_t chunk_hint) __attribute__((__warn_unused_result__)); void dm_pool_destroy(struct dm_pool *p); /* simple allocation/free routines */ void *dm_pool_alloc(struct dm_pool *p, size_t s) __attribute__((__warn_unused_result__)); void *dm_pool_alloc_aligned(struct dm_pool *p, size_t s, unsigned alignment) __attribute__((__warn_unused_result__)); void dm_pool_empty(struct dm_pool *p); void dm_pool_free(struct dm_pool *p, void *ptr); /* * To aid debugging, a pool can be locked. Any modifications made * to the content of the pool while it is locked can be detected. * Default compilation is using a crc checksum to notice modifications. * The pool locking is using the mprotect with the compilation flag * DEBUG_ENFORCE_POOL_LOCKING to enforce the memory protection. */ /* query pool lock status */ int dm_pool_locked(struct dm_pool *p); /* mark pool as locked */ int dm_pool_lock(struct dm_pool *p, int crc) __attribute__((__warn_unused_result__)); /* mark pool as unlocked */ int dm_pool_unlock(struct dm_pool *p, int crc) __attribute__((__warn_unused_result__)); /* * Object building routines: * * These allow you to 'grow' an object, useful for * building strings, or filling in dynamic * arrays. * * It's probably best explained with an example: * * char *build_string(struct dm_pool *mem) * { * int i; * char buffer[16]; * * if (!dm_pool_begin_object(mem, 128)) * return NULL; * * for (i = 0; i < 50; i++) { * snprintf(buffer, sizeof(buffer), "%d, ", i); * if (!dm_pool_grow_object(mem, buffer, 0)) * goto bad; * } * * // add null * if (!dm_pool_grow_object(mem, "\0", 1)) * goto bad; * * return dm_pool_end_object(mem); * * bad: * * dm_pool_abandon_object(mem); * return NULL; *} * * So start an object by calling dm_pool_begin_object * with a guess at the final object size - if in * doubt make the guess too small. * * Then append chunks of data to your object with * dm_pool_grow_object. Finally get your object with * a call to dm_pool_end_object. * * Setting delta to 0 means it will use strlen(extra). */ int dm_pool_begin_object(struct dm_pool *p, size_t hint); int dm_pool_grow_object(struct dm_pool *p, const void *extra, size_t delta); void *dm_pool_end_object(struct dm_pool *p); void dm_pool_abandon_object(struct dm_pool *p); /* utilities */ char *dm_pool_strdup(struct dm_pool *p, const char *str) __attribute__((__warn_unused_result__)); char *dm_pool_strndup(struct dm_pool *p, const char *str, size_t n) __attribute__((__warn_unused_result__)); void *dm_pool_zalloc(struct dm_pool *p, size_t s) __attribute__((__warn_unused_result__)); /****************** * bitset functions ******************/ typedef uint32_t *dm_bitset_t; dm_bitset_t dm_bitset_create(struct dm_pool *mem, unsigned num_bits); void dm_bitset_destroy(dm_bitset_t bs); int dm_bitset_equal(dm_bitset_t in1, dm_bitset_t in2); void dm_bit_and(dm_bitset_t out, dm_bitset_t in1, dm_bitset_t in2); void dm_bit_union(dm_bitset_t out, dm_bitset_t in1, dm_bitset_t in2); int dm_bit_get_first(dm_bitset_t bs); int dm_bit_get_next(dm_bitset_t bs, int last_bit); #define DM_BITS_PER_INT (sizeof(int) * CHAR_BIT) #define dm_bit(bs, i) \ ((bs)[((i) / DM_BITS_PER_INT) + 1] & (0x1 << ((i) & (DM_BITS_PER_INT - 1)))) #define dm_bit_set(bs, i) \ ((bs)[((i) / DM_BITS_PER_INT) + 1] |= (0x1 << ((i) & (DM_BITS_PER_INT - 1)))) #define dm_bit_clear(bs, i) \ ((bs)[((i) / DM_BITS_PER_INT) + 1] &= ~(0x1 << ((i) & (DM_BITS_PER_INT - 1)))) #define dm_bit_set_all(bs) \ memset((bs) + 1, -1, ((*(bs) / DM_BITS_PER_INT) + 1) * sizeof(int)) #define dm_bit_clear_all(bs) \ memset((bs) + 1, 0, ((*(bs) / DM_BITS_PER_INT) + 1) * sizeof(int)) #define dm_bit_copy(bs1, bs2) \ memcpy((bs1) + 1, (bs2) + 1, ((*(bs1) / DM_BITS_PER_INT) + 1) * sizeof(int)) /* Returns number of set bits */ static inline unsigned hweight32(uint32_t i) { unsigned r = (i & 0x55555555) + ((i >> 1) & 0x55555555); r = (r & 0x33333333) + ((r >> 2) & 0x33333333); r = (r & 0x0F0F0F0F) + ((r >> 4) & 0x0F0F0F0F); r = (r & 0x00FF00FF) + ((r >> 8) & 0x00FF00FF); return (r & 0x0000FFFF) + ((r >> 16) & 0x0000FFFF); } /**************** * hash functions ****************/ struct dm_hash_table; struct dm_hash_node; typedef void (*dm_hash_iterate_fn) (void *data); struct dm_hash_table *dm_hash_create(unsigned size_hint) __attribute__((__warn_unused_result__)); void dm_hash_destroy(struct dm_hash_table *t); void dm_hash_wipe(struct dm_hash_table *t); void *dm_hash_lookup(struct dm_hash_table *t, const char *key); int dm_hash_insert(struct dm_hash_table *t, const char *key, void *data); void dm_hash_remove(struct dm_hash_table *t, const char *key); void *dm_hash_lookup_binary(struct dm_hash_table *t, const void *key, uint32_t len); int dm_hash_insert_binary(struct dm_hash_table *t, const void *key, uint32_t len, void *data); void dm_hash_remove_binary(struct dm_hash_table *t, const void *key, uint32_t len); unsigned dm_hash_get_num_entries(struct dm_hash_table *t); void dm_hash_iter(struct dm_hash_table *t, dm_hash_iterate_fn f); char *dm_hash_get_key(struct dm_hash_table *t, struct dm_hash_node *n); void *dm_hash_get_data(struct dm_hash_table *t, struct dm_hash_node *n); struct dm_hash_node *dm_hash_get_first(struct dm_hash_table *t); struct dm_hash_node *dm_hash_get_next(struct dm_hash_table *t, struct dm_hash_node *n); #define dm_hash_iterate(v, h) \ for (v = dm_hash_get_first((h)); v; \ v = dm_hash_get_next((h), v)) /**************** * list functions ****************/ /* * A list consists of a list head plus elements. * Each element has 'next' and 'previous' pointers. * The list head's pointers point to the first and the last element. */ struct dm_list { struct dm_list *n, *p; }; /* * String list. */ struct dm_str_list { struct dm_list list; const char *str; }; /* * Initialise a list before use. * The list head's next and previous pointers point back to itself. */ #define DM_LIST_HEAD_INIT(name) { &(name), &(name) } #define DM_LIST_INIT(name) struct dm_list name = DM_LIST_HEAD_INIT(name) void dm_list_init(struct dm_list *head); /* * Insert an element before 'head'. * If 'head' is the list head, this adds an element to the end of the list. */ void dm_list_add(struct dm_list *head, struct dm_list *elem); /* * Insert an element after 'head'. * If 'head' is the list head, this adds an element to the front of the list. */ void dm_list_add_h(struct dm_list *head, struct dm_list *elem); /* * Delete an element from its list. * Note that this doesn't change the element itself - it may still be safe * to follow its pointers. */ void dm_list_del(struct dm_list *elem); /* * Remove an element from existing list and insert before 'head'. */ void dm_list_move(struct dm_list *head, struct dm_list *elem); /* * Join 'head1' to the end of 'head'. */ void dm_list_splice(struct dm_list *head, struct dm_list *head1); /* * Is the list empty? */ int dm_list_empty(const struct dm_list *head); /* * Is this the first element of the list? */ int dm_list_start(const struct dm_list *head, const struct dm_list *elem); /* * Is this the last element of the list? */ int dm_list_end(const struct dm_list *head, const struct dm_list *elem); /* * Return first element of the list or NULL if empty */ struct dm_list *dm_list_first(const struct dm_list *head); /* * Return last element of the list or NULL if empty */ struct dm_list *dm_list_last(const struct dm_list *head); /* * Return the previous element of the list, or NULL if we've reached the start. */ struct dm_list *dm_list_prev(const struct dm_list *head, const struct dm_list *elem); /* * Return the next element of the list, or NULL if we've reached the end. */ struct dm_list *dm_list_next(const struct dm_list *head, const struct dm_list *elem); /* * Given the address v of an instance of 'struct dm_list' called 'head' * contained in a structure of type t, return the containing structure. */ #define dm_list_struct_base(v, t, head) \ ((t *)((const char *)(v) - (const char *)&((t *) 0)->head)) /* * Given the address v of an instance of 'struct dm_list list' contained in * a structure of type t, return the containing structure. */ #define dm_list_item(v, t) dm_list_struct_base((v), t, list) /* * Given the address v of one known element e in a known structure of type t, * return another element f. */ #define dm_struct_field(v, t, e, f) \ (((t *)((uintptr_t)(v) - (uintptr_t)&((t *) 0)->e))->f) /* * Given the address v of a known element e in a known structure of type t, * return the list head 'list' */ #define dm_list_head(v, t, e) dm_struct_field(v, t, e, list) /* * Set v to each element of a list in turn. */ #define dm_list_iterate(v, head) \ for (v = (head)->n; v != head; v = v->n) /* * Set v to each element in a list in turn, starting from the element * in front of 'start'. * You can use this to 'unwind' a list_iterate and back out actions on * already-processed elements. * If 'start' is 'head' it walks the list backwards. */ #define dm_list_uniterate(v, head, start) \ for (v = (start)->p; v != head; v = v->p) /* * A safe way to walk a list and delete and free some elements along * the way. * t must be defined as a temporary variable of the same type as v. */ #define dm_list_iterate_safe(v, t, head) \ for (v = (head)->n, t = v->n; v != head; v = t, t = v->n) /* * Walk a list, setting 'v' in turn to the containing structure of each item. * The containing structure should be the same type as 'v'. * The 'struct dm_list' variable within the containing structure is 'field'. */ #define dm_list_iterate_items_gen(v, head, field) \ for (v = dm_list_struct_base((head)->n, __typeof__(*v), field); \ &v->field != (head); \ v = dm_list_struct_base(v->field.n, __typeof__(*v), field)) /* * Walk a list, setting 'v' in turn to the containing structure of each item. * The containing structure should be the same type as 'v'. * The list should be 'struct dm_list list' within the containing structure. */ #define dm_list_iterate_items(v, head) dm_list_iterate_items_gen(v, (head), list) /* * Walk a list, setting 'v' in turn to the containing structure of each item. * The containing structure should be the same type as 'v'. * The 'struct dm_list' variable within the containing structure is 'field'. * t must be defined as a temporary variable of the same type as v. */ #define dm_list_iterate_items_gen_safe(v, t, head, field) \ for (v = dm_list_struct_base((head)->n, __typeof__(*v), field), \ t = dm_list_struct_base(v->field.n, __typeof__(*v), field); \ &v->field != (head); \ v = t, t = dm_list_struct_base(v->field.n, __typeof__(*v), field)) /* * Walk a list, setting 'v' in turn to the containing structure of each item. * The containing structure should be the same type as 'v'. * The list should be 'struct dm_list list' within the containing structure. * t must be defined as a temporary variable of the same type as v. */ #define dm_list_iterate_items_safe(v, t, head) \ dm_list_iterate_items_gen_safe(v, t, (head), list) /* * Walk a list backwards, setting 'v' in turn to the containing structure * of each item. * The containing structure should be the same type as 'v'. * The 'struct dm_list' variable within the containing structure is 'field'. */ #define dm_list_iterate_back_items_gen(v, head, field) \ for (v = dm_list_struct_base((head)->p, __typeof__(*v), field); \ &v->field != (head); \ v = dm_list_struct_base(v->field.p, __typeof__(*v), field)) /* * Walk a list backwards, setting 'v' in turn to the containing structure * of each item. * The containing structure should be the same type as 'v'. * The list should be 'struct dm_list list' within the containing structure. */ #define dm_list_iterate_back_items(v, head) dm_list_iterate_back_items_gen(v, (head), list) /* * Return the number of elements in a list by walking it. */ unsigned int dm_list_size(const struct dm_list *head); /********* * selinux *********/ /* * Obtain SELinux security context assigned for the path and set this * context for creating a new file system object. This security context * is global and it is used until reset to default policy behaviour * by calling 'dm_prepare_selinux_context(NULL, 0)'. */ int dm_prepare_selinux_context(const char *path, mode_t mode); /* * Set SELinux context for existing file system object. */ int dm_set_selinux_context(const char *path, mode_t mode); /********************* * string manipulation *********************/ /* * Break up the name of a mapped device into its constituent * Volume Group, Logical Volume and Layer (if present). * If mem is supplied, the result is allocated from the mempool. * Otherwise the strings are changed in situ. */ int dm_split_lvm_name(struct dm_pool *mem, const char *dmname, char **vgname, char **lvname, char **layer); /* * Destructively split buffer into NULL-separated words in argv. * Returns number of words. */ int dm_split_words(char *buffer, unsigned max, unsigned ignore_comments, /* Not implemented */ char **argv); /* * Returns -1 if buffer too small */ int dm_snprintf(char *buf, size_t bufsize, const char *format, ...) __attribute__ ((format(printf, 3, 4))); /* * Returns pointer to the last component of the path. */ const char *dm_basename(const char *path); /* * Returns number of occurrences of 'c' in 'str' of length 'size'. */ unsigned dm_count_chars(const char *str, size_t len, const int c); /* * Length of string after escaping double quotes and backslashes. */ size_t dm_escaped_len(const char *str); /* * -- or if !layer just -. */ char *dm_build_dm_name(struct dm_pool *mem, const char *vgname, const char *lvname, const char *layer); char *dm_build_dm_uuid(struct dm_pool *mem, const char *prefix, const char *lvid, const char *layer); /* * Copies a string, quoting double quotes with backslashes. */ char *dm_escape_double_quotes(char *out, const char *src); /* * Undo quoting in situ. */ void dm_unescape_double_quotes(char *src); /* * Unescape colons and "at" signs in situ and save the substrings * starting at the position of the first unescaped colon and the * first unescaped "at" sign. This is normally used to unescape * device names used as PVs. */ void dm_unescape_colons_and_at_signs(char *src, char **substr_first_unquoted_colon, char **substr_first_unquoted_at_sign); /* * Replacement for strncpy() function. * * Copies no more than n bytes from string pointed by src to the buffer * pointed by dest and ensure string is finished with '\0'. * Returns 0 if the whole string does not fit. */ int dm_strncpy(char *dest, const char *src, size_t n); /* * Recognize unit specifier in the 'units' arg and return a factor * representing that unit. If the 'units' contains a prefix with digits, * the 'units' is considered to be a custom unit. * * Also, set 'unit_type' output arg to the character that represents * the unit specified. The 'unit_type' character equals to the unit * character itself recognized in the 'units' arg for canonical units. * Otherwise, the 'unit_type' character is set to 'U' for custom unit. * * An example for k/K canonical units and 8k/8K custom units: * * units unit_type return value (factor) * k k 1024 * K K 1000 * 8k U 1024*8 * 8K U 1000*8 * etc... * * Recognized units: * * h/H - human readable (returns 1 for both) * b/B - byte (returns 1 for both) * s/S - sector (returns 512 for both) * k/K - kilo (returns 1024/1000 respectively) * m/M - mega (returns 1024^2/1000^2 respectively) * g/G - giga (returns 1024^3/1000^3 respectively) * t/T - tera (returns 1024^4/1000^4 respectively) * p/P - peta (returns 1024^5/1000^5 respectively) * e/E - exa (returns 1024^6/1000^6 respectively) * * Only one units character is allowed in the 'units' arg * if strict mode is enabled by 'strict' arg. * * The 'endptr' output arg, if not NULL, saves the pointer * in the 'units' string which follows the unit specifier * recognized (IOW the position where the parsing of the * unit specifier stopped). * * Returns the unit factor or 0 if no unit is recognized. */ uint64_t dm_units_to_factor(const char *units, char *unit_type, int strict, const char **endptr); /************************** * file/stream manipulation **************************/ /* * Create a directory (with parent directories if necessary). * Returns 1 on success, 0 on failure. */ int dm_create_dir(const char *dir); int dm_is_empty_dir(const char *dir); /* * Close a stream, with nicer error checking than fclose's. * Derived from gnulib's close-stream.c. * * Close "stream". Return 0 if successful, and EOF (setting errno) * otherwise. Upon failure, set errno to 0 if the error number * cannot be determined. Useful mainly for writable streams. */ int dm_fclose(FILE *stream); /* * Returns size of a buffer which is allocated with dm_malloc. * Pointer to the buffer is stored in *buf. * Returns -1 on failure leaving buf undefined. */ int dm_asprintf(char **buf, const char *format, ...) __attribute__ ((format(printf, 2, 3))); int dm_vasprintf(char **buf, const char *format, va_list ap) __attribute__ ((format(printf, 2, 0))); /* * create lockfile (pidfile) - create and lock a lock file * @lockfile: location of lock file * * Returns: 1 on success, 0 otherwise, errno is handled internally */ int dm_create_lockfile(const char* lockfile); /* * Query whether a daemon is running based on its lockfile * * Returns: 1 if running, 0 if not */ int dm_daemon_is_running(const char* lockfile); /********************* * regular expressions *********************/ struct dm_regex; /* * Initialise an array of num patterns for matching. * Uses memory from mem. */ struct dm_regex *dm_regex_create(struct dm_pool *mem, const char * const *patterns, unsigned num_patterns); /* * Match string s against the patterns. * Returns the index of the highest pattern in the array that matches, * or -1 if none match. */ int dm_regex_match(struct dm_regex *regex, const char *s); /* * This is useful for regression testing only. The idea is if two * fingerprints are different, then the two dfas are certainly not * isomorphic. If two fingerprints _are_ the same then it's very likely * that the dfas are isomorphic. * * This function must be called before any matching is done. */ uint32_t dm_regex_fingerprint(struct dm_regex *regex); /****************** * percent handling ******************/ /* * A fixed-point representation of percent values. One percent equals to * DM_PERCENT_1 as defined below. Values that are not multiples of DM_PERCENT_1 * represent fractions, with precision of 1/1000000 of a percent. See * dm_percent_to_float for a conversion to a floating-point representation. * * You should always use dm_make_percent when building dm_percent_t values. The * implementation of dm_make_percent is biased towards the middle: it ensures that * the result is DM_PERCENT_0 or DM_PERCENT_100 if and only if this is the actual * value -- it never rounds any intermediate value (> 0 or < 100) to either 0 * or 100. */ #define DM_PERCENT_CHAR '%' typedef enum { DM_PERCENT_0 = 0, DM_PERCENT_1 = 1000000, DM_PERCENT_100 = 100 * DM_PERCENT_1, DM_PERCENT_INVALID = -1, DM_PERCENT_FAILED = -2 } dm_percent_range_t; typedef int32_t dm_percent_t; float dm_percent_to_float(dm_percent_t percent); dm_percent_t dm_make_percent(uint64_t numerator, uint64_t denominator); /********************* * reporting functions *********************/ struct dm_report_object_type { uint32_t id; /* Powers of 2 */ const char *desc; const char *prefix; /* field id string prefix (optional) */ /* FIXME: convert to proper usage of const pointers here */ void *(*data_fn)(void *object); /* callback from report_object() */ }; struct dm_report_field; /* * dm_report_field_type flags */ #define DM_REPORT_FIELD_MASK 0x00000FFF #define DM_REPORT_FIELD_ALIGN_MASK 0x0000000F #define DM_REPORT_FIELD_ALIGN_LEFT 0x00000001 #define DM_REPORT_FIELD_ALIGN_RIGHT 0x00000002 #define DM_REPORT_FIELD_TYPE_MASK 0x00000FF0 #define DM_REPORT_FIELD_TYPE_NONE 0x00000000 #define DM_REPORT_FIELD_TYPE_STRING 0x00000010 #define DM_REPORT_FIELD_TYPE_NUMBER 0x00000020 #define DM_REPORT_FIELD_TYPE_SIZE 0x00000040 #define DM_REPORT_FIELD_TYPE_PERCENT 0x00000080 #define DM_REPORT_FIELD_TYPE_STRING_LIST 0x00000100 #define DM_REPORT_FIELD_TYPE_ID_LEN 32 #define DM_REPORT_FIELD_TYPE_HEADING_LEN 32 struct dm_report; struct dm_report_field_type { uint32_t type; /* object type id */ uint32_t flags; /* DM_REPORT_FIELD_* */ uint32_t offset; /* byte offset in the object */ int32_t width; /* default width */ /* string used to specify the field */ const char id[DM_REPORT_FIELD_TYPE_ID_LEN]; /* string printed in header */ const char heading[DM_REPORT_FIELD_TYPE_HEADING_LEN]; int (*report_fn)(struct dm_report *rh, struct dm_pool *mem, struct dm_report_field *field, const void *data, void *private_data); const char *desc; /* description of the field */ }; /* * Per-field reserved value. */ struct dm_report_field_reserved_value { /* field_num is the position of the field in 'fields' array passed to dm_report_init_with_selection */ uint32_t field_num; /* the value is of the same type as the field identified by field_num */ const void *value; }; /* * Reserved value is a 'value' that is used directly if any of the 'names' is hit. * * If type is any of DM_REPORT_FIELD_TYPE_*, the reserved value is recognized * for all fields of that type. * * If type is DM_REPORT_FIELD_TYPE_NONE, the reserved value is recognized * for the exact field specified - hence the type of the value is automatically * the same as the type of the field itself. * * The array of reserved values is used to initialize reporting with * selection enabled (see also dm_report_init_with_selection function). */ struct dm_report_reserved_value { const unsigned type; /* DM_REPORT_FIELD_TYPE_* */ const void *value; /* reserved value: struct dm_report_field_reserved_value for DM_REPORT_FIELD_TYPE_NONE uint64_t for DM_REPORT_FIELD_TYPE_NUMBER uint64_t for DM_REPORT_FIELD_TYPE_SIZE (number of 512-byte sectors) uint64_t for DM_REPORT_FIELD_TYPE_PERCENT const char * for DM_REPORT_FIELD_TYPE_STRING */ const char **names; /* null-terminated array of names for this reserved value */ const char *description; /* description of the reserved value */ }; /* * dm_report_init output_flags */ #define DM_REPORT_OUTPUT_MASK 0x000000FF #define DM_REPORT_OUTPUT_ALIGNED 0x00000001 #define DM_REPORT_OUTPUT_BUFFERED 0x00000002 #define DM_REPORT_OUTPUT_HEADINGS 0x00000004 #define DM_REPORT_OUTPUT_FIELD_NAME_PREFIX 0x00000008 #define DM_REPORT_OUTPUT_FIELD_UNQUOTED 0x00000010 #define DM_REPORT_OUTPUT_COLUMNS_AS_ROWS 0x00000020 struct dm_report *dm_report_init(uint32_t *report_types, const struct dm_report_object_type *types, const struct dm_report_field_type *fields, const char *output_fields, const char *output_separator, uint32_t output_flags, const char *sort_keys, void *private_data); struct dm_report *dm_report_init_with_selection(uint32_t *report_types, const struct dm_report_object_type *types, const struct dm_report_field_type *fields, const char *output_fields, const char *output_separator, uint32_t output_flags, const char *sort_keys, const char *selection, const struct dm_report_reserved_value reserved_values[], void *private_data); /* * Report an object, pass it through the selection criteria if they * are present and display the result on output if it passes the criteria. */ int dm_report_object(struct dm_report *rh, void *object); /* * The same as dm_report_object, but display the result on output only if * 'do_output' arg is set. Also, save the result of selection in 'selected' * arg if it's not NULL (either 1 if the object passes, otherwise 0). */ int dm_report_object_is_selected(struct dm_report *rh, void *object, int do_output, int *selected); /* * Compact report output so that if field value is empty for all rows in * the report, drop the field from output completely (including headers). * Compact output is applicable only if report is buffered, otherwise * this function has no effect. */ int dm_report_compact_fields(struct dm_report *rh); int dm_report_output(struct dm_report *rh); void dm_report_free(struct dm_report *rh); /* * Prefix added to each field name with DM_REPORT_OUTPUT_FIELD_NAME_PREFIX */ int dm_report_set_output_field_name_prefix(struct dm_report *rh, const char *report_prefix); /* * Report functions are provided for simple data types. * They take care of allocating copies of the data. */ int dm_report_field_string(struct dm_report *rh, struct dm_report_field *field, const char *const *data); int dm_report_field_string_list(struct dm_report *rh, struct dm_report_field *field, const struct dm_list *data, const char *delimiter); int dm_report_field_string_list_unsorted(struct dm_report *rh, struct dm_report_field *field, const struct dm_list *data, const char *delimiter); int dm_report_field_int32(struct dm_report *rh, struct dm_report_field *field, const int32_t *data); int dm_report_field_uint32(struct dm_report *rh, struct dm_report_field *field, const uint32_t *data); int dm_report_field_int(struct dm_report *rh, struct dm_report_field *field, const int *data); int dm_report_field_uint64(struct dm_report *rh, struct dm_report_field *field, const uint64_t *data); int dm_report_field_percent(struct dm_report *rh, struct dm_report_field *field, const dm_percent_t *data); /* * For custom fields, allocate the data in 'mem' and use * dm_report_field_set_value(). * 'sortvalue' may be NULL if it matches 'value' */ void dm_report_field_set_value(struct dm_report_field *field, const void *value, const void *sortvalue); /************************* * config file parse/print *************************/ typedef enum { DM_CFG_INT, DM_CFG_FLOAT, DM_CFG_STRING, DM_CFG_EMPTY_ARRAY } dm_config_value_type_t; struct dm_config_value { dm_config_value_type_t type; union { int64_t i; float f; double d; /* Unused. */ const char *str; } v; struct dm_config_value *next; /* For arrays */ }; struct dm_config_node { const char *key; struct dm_config_node *parent, *sib, *child; struct dm_config_value *v; int id; }; struct dm_config_tree { struct dm_config_node *root; struct dm_config_tree *cascade; struct dm_pool *mem; void *custom; }; struct dm_config_tree *dm_config_create(void); struct dm_config_tree *dm_config_from_string(const char *config_settings); int dm_config_parse(struct dm_config_tree *cft, const char *start, const char *end); void *dm_config_get_custom(struct dm_config_tree *cft); void dm_config_set_custom(struct dm_config_tree *cft, void *custom); /* * When searching, first_cft is checked before second_cft. */ struct dm_config_tree *dm_config_insert_cascaded_tree(struct dm_config_tree *first_cft, struct dm_config_tree *second_cft); /* * If there's a cascaded dm_config_tree, remove the top layer * and return the layer below. Otherwise return NULL. */ struct dm_config_tree *dm_config_remove_cascaded_tree(struct dm_config_tree *cft); /* * Create a new, uncascaded config tree equivalent to the input cascade. */ struct dm_config_tree *dm_config_flatten(struct dm_config_tree *cft); void dm_config_destroy(struct dm_config_tree *cft); /* Simple output line by line. */ typedef int (*dm_putline_fn)(const char *line, void *baton); /* More advaced output with config node reference. */ typedef int (*dm_config_node_out_fn)(const struct dm_config_node *cn, const char *line, void *baton); /* * Specification for advanced config node output. */ struct dm_config_node_out_spec { dm_config_node_out_fn prefix_fn; /* called before processing config node lines */ dm_config_node_out_fn line_fn; /* called for each config node line */ dm_config_node_out_fn suffix_fn; /* called after processing config node lines */ }; /* Write the node and any subsequent siblings it has. */ int dm_config_write_node(const struct dm_config_node *cn, dm_putline_fn putline, void *baton); int dm_config_write_node_out(const struct dm_config_node *cn, const struct dm_config_node_out_spec *out_spec, void *baton); /* Write given node only without subsequent siblings. */ int dm_config_write_one_node(const struct dm_config_node *cn, dm_putline_fn putline, void *baton); int dm_config_write_one_node_out(const struct dm_config_node *cn, const struct dm_config_node_out_spec *out_spec, void *baton); struct dm_config_node *dm_config_find_node(const struct dm_config_node *cn, const char *path); int dm_config_has_node(const struct dm_config_node *cn, const char *path); int dm_config_remove_node(struct dm_config_node *parent, struct dm_config_node *remove); const char *dm_config_find_str(const struct dm_config_node *cn, const char *path, const char *fail); const char *dm_config_find_str_allow_empty(const struct dm_config_node *cn, const char *path, const char *fail); int dm_config_find_int(const struct dm_config_node *cn, const char *path, int fail); int64_t dm_config_find_int64(const struct dm_config_node *cn, const char *path, int64_t fail); float dm_config_find_float(const struct dm_config_node *cn, const char *path, float fail); const struct dm_config_node *dm_config_tree_find_node(const struct dm_config_tree *cft, const char *path); const char *dm_config_tree_find_str(const struct dm_config_tree *cft, const char *path, const char *fail); const char *dm_config_tree_find_str_allow_empty(const struct dm_config_tree *cft, const char *path, const char *fail); int dm_config_tree_find_int(const struct dm_config_tree *cft, const char *path, int fail); int64_t dm_config_tree_find_int64(const struct dm_config_tree *cft, const char *path, int64_t fail); float dm_config_tree_find_float(const struct dm_config_tree *cft, const char *path, float fail); int dm_config_tree_find_bool(const struct dm_config_tree *cft, const char *path, int fail); /* * Understands (0, ~0), (y, n), (yes, no), (on, * off), (true, false). */ int dm_config_find_bool(const struct dm_config_node *cn, const char *path, int fail); int dm_config_value_is_bool(const struct dm_config_value *v); int dm_config_get_uint32(const struct dm_config_node *cn, const char *path, uint32_t *result); int dm_config_get_uint64(const struct dm_config_node *cn, const char *path, uint64_t *result); int dm_config_get_str(const struct dm_config_node *cn, const char *path, const char **result); int dm_config_get_list(const struct dm_config_node *cn, const char *path, const struct dm_config_value **result); int dm_config_get_section(const struct dm_config_node *cn, const char *path, const struct dm_config_node **result); unsigned dm_config_maybe_section(const char *str, unsigned len); const char *dm_config_parent_name(const struct dm_config_node *n); struct dm_config_node *dm_config_clone_node_with_mem(struct dm_pool *mem, const struct dm_config_node *node, int siblings); struct dm_config_node *dm_config_create_node(struct dm_config_tree *cft, const char *key); struct dm_config_value *dm_config_create_value(struct dm_config_tree *cft); struct dm_config_node *dm_config_clone_node(struct dm_config_tree *cft, const struct dm_config_node *cn, int siblings); struct dm_pool *dm_config_memory(struct dm_config_tree *cft); /* Udev device directory. */ #define DM_UDEV_DEV_DIR "/dev/" /* Cookie prefixes. * * The cookie value consists of a prefix (16 bits) and a base (16 bits). * We can use the prefix to store the flags. These flags are sent to * kernel within given dm task. When returned back to userspace in * DM_COOKIE udev environment variable, we can control several aspects * of udev rules we use by decoding the cookie prefix. When doing the * notification, we replace the cookie prefix with DM_COOKIE_MAGIC, * so we notify the right semaphore. * * It is still possible to use cookies for passing the flags to udev * rules even when udev_sync is disabled. The base part of the cookie * will be zero (there's no notification semaphore) and prefix will be * set then. However, having udev_sync enabled is highly recommended. */ #define DM_COOKIE_MAGIC 0x0D4D #define DM_UDEV_FLAGS_MASK 0xFFFF0000 #define DM_UDEV_FLAGS_SHIFT 16 /* * DM_UDEV_DISABLE_DM_RULES_FLAG is set in case we need to disable * basic device-mapper udev rules that create symlinks in /dev/ * directory. However, we can't reliably prevent creating default * nodes by udev (commonly /dev/dm-X, where X is a number). */ #define DM_UDEV_DISABLE_DM_RULES_FLAG 0x0001 /* * DM_UDEV_DISABLE_SUBSYTEM_RULES_FLAG is set in case we need to disable * subsystem udev rules, but still we need the general DM udev rules to * be applied (to create the nodes and symlinks under /dev and /dev/disk). */ #define DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG 0x0002 /* * DM_UDEV_DISABLE_DISK_RULES_FLAG is set in case we need to disable * general DM rules that set symlinks in /dev/disk directory. */ #define DM_UDEV_DISABLE_DISK_RULES_FLAG 0x0004 /* * DM_UDEV_DISABLE_OTHER_RULES_FLAG is set in case we need to disable * all the other rules that are not general device-mapper nor subsystem * related (the rules belong to other software or packages). All foreign * rules should check this flag directly and they should ignore further * rule processing for such event. */ #define DM_UDEV_DISABLE_OTHER_RULES_FLAG 0x0008 /* * DM_UDEV_LOW_PRIORITY_FLAG is set in case we need to instruct the * udev rules to give low priority to the device that is currently * processed. For example, this provides a way to select which symlinks * could be overwritten by high priority ones if their names are equal. * Common situation is a name based on FS UUID while using origin and * snapshot devices. */ #define DM_UDEV_LOW_PRIORITY_FLAG 0x0010 /* * DM_UDEV_DISABLE_LIBRARY_FALLBACK is set in case we need to disable * libdevmapper's node management. We will rely on udev completely * and there will be no fallback action provided by libdevmapper if * udev does something improperly. */ #define DM_UDEV_DISABLE_LIBRARY_FALLBACK 0x0020 /* * DM_UDEV_PRIMARY_SOURCE_FLAG is automatically appended by * libdevmapper for all ioctls generating udev uevents. Once used in * udev rules, we know if this is a real "primary sourced" event or not. * We need to distinguish real events originated in libdevmapper from * any spurious events to gather all missing information (e.g. events * generated as a result of "udevadm trigger" command or as a result * of the "watch" udev rule). */ #define DM_UDEV_PRIMARY_SOURCE_FLAG 0x0040 /* * Udev flags reserved for use by any device-mapper subsystem. */ #define DM_SUBSYSTEM_UDEV_FLAG0 0x0100 #define DM_SUBSYSTEM_UDEV_FLAG1 0x0200 #define DM_SUBSYSTEM_UDEV_FLAG2 0x0400 #define DM_SUBSYSTEM_UDEV_FLAG3 0x0800 #define DM_SUBSYSTEM_UDEV_FLAG4 0x1000 #define DM_SUBSYSTEM_UDEV_FLAG5 0x2000 #define DM_SUBSYSTEM_UDEV_FLAG6 0x4000 #define DM_SUBSYSTEM_UDEV_FLAG7 0x8000 int dm_cookie_supported(void); /* * Udev synchronisation functions. */ void dm_udev_set_sync_support(int sync_with_udev); int dm_udev_get_sync_support(void); void dm_udev_set_checking(int checking); int dm_udev_get_checking(void); /* * Default value to get new auto generated cookie created */ #define DM_COOKIE_AUTO_CREATE 0 int dm_udev_create_cookie(uint32_t *cookie); int dm_udev_complete(uint32_t cookie); int dm_udev_wait(uint32_t cookie); #define DM_DEV_DIR_UMASK 0022 #define DM_CONTROL_NODE_UMASK 0177 #ifdef __cplusplus } #endif #endif /* LIB_DEVICE_MAPPER_H */