168 lines
4.1 KiB
C
168 lines
4.1 KiB
C
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/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <sched.h>
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#include <fcntl.h>
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#include <sys/mount.h>
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#include <linux/loop.h>
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#include <cutils/config_utils.h>
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#include <cutils/properties.h>
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#include "vold.h"
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#include "devmapper.h"
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#define DEBUG_DEVMAPPER 1
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static int loopback_start(struct devmapping *dm)
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{
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int i;
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int fd;
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char filename[255];
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int rc;
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#if DEBUG_DEVMAPPER
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LOG_VOL("loopback_start(%s):", dm->type_data.loop.loop_src);
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#endif
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for (i = 0; i < MAX_LOOP; i++) {
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struct loop_info info;
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sprintf(filename, "/dev/block/loop%d", i);
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if ((fd = open(filename, O_RDWR)) < 0) {
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LOGE("Unable to open %s (%s)\n", filename, strerror(errno));
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return -errno;
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}
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rc = ioctl(fd, LOOP_GET_STATUS, &info);
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if (rc < 0 && errno == ENXIO)
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break;
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close(fd);
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if (rc < 0) {
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LOGE("Unable to get loop status for %s (%s)\n", filename,
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strerror(errno));
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return -errno;
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}
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}
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if (i == MAX_LOOP) {
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LOGE("Out of loop devices\n");
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return -ENOSPC;
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}
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int file_fd;
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if ((file_fd = open(dm->type_data.loop.loop_src, O_RDWR)) < 0) {
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LOGE("Unable to open %s (%s)\n", dm->type_data.loop.loop_src,
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strerror(errno));
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return -errno;
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}
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if (ioctl(fd, LOOP_SET_FD, file_fd) < 0) {
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LOGE("Error setting up loopback interface (%s)\n", strerror(errno));
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return -errno;
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}
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dm->type_data.loop.loop_dev = strdup(filename);
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dm->type_data.loop.loop_no = i;
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close(fd);
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close(file_fd);
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#if DEBUG_DEVMAPPER
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LOG_VOL("Loop setup on %s for %s\n", dm->type_data.loop.loop_dev,
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dm->type_data.loop.loop_src);
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#endif
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return 0;
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}
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int devmapper_start(struct devmapping *dm)
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{
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int rc;
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char src_blkdev_path[255];
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#if DEBUG_DEVMAPPER
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LOG_VOL("devmapper_start()");
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#endif
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if (dm->src_type == dmsrc_loopback) {
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if ((rc = loopback_start(dm)) < 0)
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return rc;
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} else if (dm->src_type == dmsrc_partition) {
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LOGE("partition maps not yet supported");
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return -ENOSYS;
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} else {
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LOGE("devmapper_start(): Unsupported source type '%d'", dm->src_type);
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return -ENOENT;
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}
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/*
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* Configure the device mapper
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*/
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return 0;
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}
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struct devmapping *devmapper_init(char *src, char *src_type, uint32_t size_mb,
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char *target, char *params, char *tgt_fs)
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{
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struct devmapping *dm;
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if (!(dm = malloc(sizeof(struct devmapping)))) {
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LOGE("devmapper_init(): out of memory");
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return NULL;
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}
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memset(dm, 0, sizeof(struct devmapping));
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if (!strcmp(src_type, "loopback_file")) {
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dm->src_type = dmsrc_loopback;
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dm->type_data.loop.loop_src = strdup(src);
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} else if (!strncmp(src_type, "partition ", strlen("partition "))) {
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dm->src_type = dmsrc_partition;
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char *p = strtok(src_type, " ");
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if (!p) {
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LOGE("Invalid partition specifier");
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goto out_free;
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}
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dm->type_data.part.part_type = strtoul(p, NULL, 0);
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} else {
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LOGE("Invalid src_type defined (%s)", src_type);
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goto out_free;
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}
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// XXX: Validate these
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dm->size_mb = size_mb;
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dm->target = strdup(target);
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dm->params = strdup(params);
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dm->tgt_fs = strdup(tgt_fs);
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return dm;
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out_free:
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return NULL;
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}
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