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lvm2/libdm/libdevmapper.h
Alasdair Kergon ee80c0f0e3 improve changelog
2007-08-06 13:09:46 +00:00

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/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2005 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>
/*****************************************************************
* 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.
*
* You will need to build a struct dm_task for
* each ioctl command you want to execute.
*/
typedef void (*dm_log_fn) (int level, const char *file, int line,
const char *f, ...)
__attribute__ ((format(printf, 4, 5)));
/*
* The library user may wish to register their own
* logging function, by default errors go to stderr.
* Use dm_log_init(NULL) to restore the default log fn.
*/
void dm_log_init(dm_log_fn fn);
void dm_log_init_verbose(int level);
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
};
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_minor(struct dm_task *dmt, int minor);
int dm_task_set_major(struct dm_task *dmt, int major);
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_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_suppress_identical_reload(struct dm_task *dmt);
/*
* 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
*/
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);
/*
* 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);
/*
* 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,
struct dm_tree_node *parent,
uint32_t inverted);
/*
* Get properties of a node.
*/
const char *dm_tree_node_get_name(struct dm_tree_node *node);
const char *dm_tree_node_get_uuid(struct dm_tree_node *node);
const struct dm_info *dm_tree_node_get_info(struct dm_tree_node *node);
void *dm_tree_node_get_context(struct dm_tree_node *node);
/*
* 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(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_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);
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_target_area(struct dm_tree_node *node,
const char *dev_name,
const char *dlid,
uint64_t offset);
/*****************************************************************************
* 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);
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_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_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, strlen(buffer)))
* 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.
*
*/
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);
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))
/*********
* 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).
*/
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, ...);
/*
* 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, ...);
/*********************
* 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);
/*********************
* 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
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 */
const char id[32]; /* string used to specify the field */
const char heading[32]; /* string printed in header */
int (*report_fn)(struct dm_report *rh, struct dm_pool *mem,
struct dm_report_field *field, const void *data,
void *private);
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
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);
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);
/*
* 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);
#endif /* LIB_DEVICE_MAPPER_H */
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