mirror of
git://sourceware.org/git/lvm2.git
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224 lines
4.7 KiB
C
224 lines
4.7 KiB
C
/*
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* Copyright (C) 2001 Sistina Software (UK) Limited.
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*
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* This file is released under the LGPL.
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*/
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#include "libdevmapper.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <linux/kdev_t.h>
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#include <linux/device-mapper.h>
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#include "libdm-targets.h"
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#include "libdm-common.h"
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#define DEV_DIR "/dev/"
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static char _dm_dir[PATH_MAX] = DEV_DIR DM_DIR;
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/*
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* Library users can provide their own logging
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* function.
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*/
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void _default_log(int level, const char *file, int line,
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const char *f, ...)
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{
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va_list ap;
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va_start(ap, f);
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vfprintf(stderr, f, ap);
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va_end(ap);
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fprintf(stderr, "\n");
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}
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dm_log_fn _log = _default_log;
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void dm_log_init(dm_log_fn fn)
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{
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_log = fn;
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}
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void _build_dev_path(char *buffer, size_t len, const char *dev_name)
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{
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/* If there's a /, assume caller knows what they're doing */
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if (strchr(dev_name, '/'))
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snprintf(buffer, len, "%s", dev_name);
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else
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snprintf(buffer, len, "%s/%s", _dm_dir, dev_name);
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}
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int dm_get_library_version(char *version, size_t size)
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{
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strncpy(version, DM_LIB_VERSION, size);
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return 1;
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}
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struct dm_task *dm_task_create(int type)
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{
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struct dm_task *dmt = malloc(sizeof(*dmt));
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if (!dmt) {
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log_error("dm_task_create: malloc(%d) failed", sizeof(*dmt));
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return NULL;
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}
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memset(dmt, 0, sizeof(*dmt));
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dmt->type = type;
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dmt->minor = -1;
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return dmt;
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}
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int dm_task_set_name(struct dm_task *dmt, const char *name)
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{
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char *pos;
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char path[PATH_MAX];
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struct stat st1, st2;
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if (dmt->dev_name) {
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free(dmt->dev_name);
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dmt->dev_name = NULL;
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}
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/* If path was supplied, remove it if it points to the same device
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* as its last component.
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*/
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if ((pos = strrchr(name, '/'))) {
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snprintf(path, sizeof(path), "%s/%s", _dm_dir, pos + 1);
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if (stat(name, &st1) || stat(path, &st2) ||
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!(st1.st_dev == st2.st_dev)) {
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log_error("dm_task_set_name: Device %s not found", name);
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return 0;
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}
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name = pos + 1;
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}
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if (!(dmt->dev_name = strdup(name))) {
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log_error("dm_task_set_name: strdup(%s) failed", name);
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return 0;
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}
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log_very_verbose("Setting name: %s", dmt->dev_name);
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return 1;
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}
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int dm_task_set_uuid(struct dm_task *dmt, const char *uuid)
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{
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if (dmt->uuid) {
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free(dmt->uuid);
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dmt->uuid = NULL;
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}
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if (!(dmt->uuid = strdup(uuid))) {
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log_error("dm_task_set_uuid: strdup(%s) failed", uuid);
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return 0;
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}
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log_very_verbose("Setting uuid: %s", dmt->uuid);
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return 1;
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}
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int dm_task_set_minor(struct dm_task *dmt, int minor)
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{
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dmt->minor = minor;
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return 1;
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}
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int dm_task_add_target(struct dm_task *dmt,
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uint64_t start,
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uint64_t size,
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const char *ttype,
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const char *params)
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{
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struct target *t = create_target(start, size, ttype, params);
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if (!t)
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return 0;
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if (!dmt->head)
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dmt->head = dmt->tail = t;
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else {
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dmt->tail->next = t;
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dmt->tail = t;
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}
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return 1;
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}
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int add_dev_node(const char *dev_name, dev_t dev)
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{
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char path[PATH_MAX];
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struct stat info;
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_build_dev_path(path, sizeof(path), dev_name);
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if (stat(path, &info) >= 0) {
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if (!S_ISBLK(info.st_mode)) {
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log_error("A non-block device file at '%s' "
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"is already present", path);
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return 0;
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}
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if (info.st_rdev == dev)
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return 1;
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if (unlink(path) < 0) {
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log_error("Unable to unlink device node for '%s'", dev_name);
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return 0;
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}
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}
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if (mknod(path, S_IFBLK | S_IRUSR | S_IWUSR | S_IRGRP, dev) < 0) {
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log_error("Unable to make device node for '%s'", dev_name);
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return 0;
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}
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return 1;
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}
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int rm_dev_node(const char *dev_name)
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{
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char path[PATH_MAX];
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struct stat info;
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_build_dev_path(path, sizeof(path), dev_name);
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if (stat(path, &info) < 0)
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return 1;
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if (unlink(path) < 0) {
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log_error("Unable to unlink device node for '%s'", dev_name);
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return 0;
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}
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return 1;
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}
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int dm_set_dev_dir(const char *dir)
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{
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snprintf(_dm_dir, sizeof(_dm_dir), "%s%s", dir, DM_DIR);
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return 1;
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}
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const char *dm_dir(void)
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{
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return _dm_dir;
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}
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