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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 <sys/types.h> #ifdef linux # include <linux/types.h> #endif #include <limits.h> #include <string.h> #include <stdlib.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 }; 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(struct dm_task *dmt); const char *dm_task_get_uuid(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_message(struct dm_task *dmt, const char *message); int dm_task_set_sector(struct dm_task *dmt, uint64_t sector); 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); /* * 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 */ 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); 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) # 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); #endif /* LIB_DEVICE_MAPPER_H */