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lvm2/libdm/libdevmapper.h
Alasdair Kergon 57a8279442 Add --setuuid to dmsetup rename. 
Add dm_task_set_newuuid to set uuid of mapped device post-creation. (pjones)
2010-10-15 01:10:27 +00:00

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/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2010 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 <inttypes.h>
#include <stdarg.h>
#include <sys/types.h>
#ifdef linux
# include <linux/types.h>
#endif
#include <limits.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#ifndef __GNUC__
# define __typeof__ typeof
#endif
#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.
*/
typedef void (*dm_log_with_errno_fn) (int level, const char *file, int line,
int dm_errno, 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);
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;
};
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);
int dm_task_get_info(struct dm_task *dmt, struct dm_info *dmi);
const char *dm_task_get_name(const struct dm_task *dmt);
const char *dm_task_get_uuid(const struct dm_task *dmt);
struct dm_deps *dm_task_get_deps(struct dm_task *dmt);
struct dm_names *dm_task_get_names(struct dm_task *dmt);
struct dm_versions *dm_task_get_versions(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);
/*
* 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);
/*
* 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);
/*
* Configure the device-mapper directory
*/
int dm_set_dev_dir(const char *dir);
const char *dm_dir(void);
/*
* Determine whether a major number belongs to device-mapper or not.
*/
int dm_is_dm_major(uint32_t major);
/*
* 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);
/*
* 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);
/*
* 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);
/*
* 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 */
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);
/*
* 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);
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);
void *dm_malloc_aux_debug(size_t s, const char *file, int line);
void *dm_zalloc_aux(size_t s, const char *file, int line);
void *dm_zalloc_aux_debug(size_t s, const char *file, int line);
char *dm_strdup_aux(const char *str, const char *file, int line);
void dm_free_aux(void *p);
void *dm_realloc_aux(void *p, unsigned int s, const char *file, int line);
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);
void dm_pool_destroy(struct dm_pool *p);
/* simple allocation/free routines */
void *dm_pool_alloc(struct dm_pool *p, size_t s);
void *dm_pool_alloc_aligned(struct dm_pool *p, size_t s, unsigned alignment);
void dm_pool_empty(struct dm_pool *p);
void dm_pool_free(struct dm_pool *p, void *ptr);
/*
* 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);
char *dm_pool_strndup(struct dm_pool *p, const char *str, size_t n);
void *dm_pool_zalloc(struct dm_pool *p, size_t s);
/******************
* 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);
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 char *key, uint32_t len);
int dm_hash_insert_binary(struct dm_hash_table *t, const char *key, uint32_t len,
void *data);
void dm_hash_remove_binary(struct dm_hash_table *t, const char *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;
};
/*
* Initialise a list before use.
* The list head's next and previous pointers point back to itself.
*/
#define DM_LIST_INIT(name) struct dm_list name = { &(name), &(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 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 *)((char*)(v) - (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
*********/
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.
*/
char *dm_basename(const char *path);
/**************************
* 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);
/*
* 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)));
/*
* 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 **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);
/*********************
* reporting functions
*********************/
struct dm_report_object_type {
uint32_t id; /* Powers of 2 */
const char *desc;
const char *prefix; /* field id string prefix (optional) */
void *(*data_fn)(void *object); /* callback from report_object() */
};
struct dm_report_field;
/*
* dm_report_field_type flags
*/
#define DM_REPORT_FIELD_MASK 0x000000FF
#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 0x000000F0
#define DM_REPORT_FIELD_TYPE_STRING 0x00000010
#define DM_REPORT_FIELD_TYPE_NUMBER 0x00000020
#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 */
};
/*
* 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);
int dm_report_object(struct dm_report *rh, void *object);
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 **data);
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);
/*
* 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);
/* 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/<DM_DIR>
* 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
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);
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
#ifdef __cplusplus
}
#endif
#endif /* LIB_DEVICE_MAPPER_H */
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