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Merge "system: libdiskconfig: Add libdiskconfig"

  • Loading branch information...
commit d475d09567eb710a13e1588c5fec3ca53a3d79c8 2 parents bde9e13 + a6391f1
San Mehat authored Android (Google) Code Review committed
View
129 include/diskconfig/diskconfig.h
@@ -0,0 +1,129 @@
+/* system/core/include/diskconfig/diskconfig.h
+ *
+ * Copyright 2008, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __LIBS_DISKCONFIG_H
+#define __LIBS_DISKCONFIG_H
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define MAX_NAME_LEN 512
+#define MAX_NUM_PARTS 16
+
+/* known partition schemes */
+#define PART_SCHEME_MBR 0x1
+#define PART_SCHEME_GPT 0x2
+
+/* PC Bios partition status */
+#define PC_PART_ACTIVE 0x80
+#define PC_PART_NORMAL 0x0
+
+/* Known (rather, used by us) partition types */
+#define PC_PART_TYPE_LINUX 0x83
+#define PC_PART_TYPE_EXTENDED 0x05
+#define PC_PART_TYPE_FAT32 0x0c
+
+#define PC_NUM_BOOT_RECORD_PARTS 4
+
+#define PC_EBR_LOGICAL_PART 0
+#define PC_EBR_NEXT_PTR_PART 1
+
+#define PC_BIOS_BOOT_SIG 0xAA55
+
+#define PC_MBR_DISK_OFFSET 0
+#define PC_MBR_SIZE 512
+
+#define PART_ACTIVE_FLAG 0x1
+
+struct chs {
+ uint8_t head;
+ uint8_t sector;
+ uint8_t cylinder;
+} __attribute__((__packed__));
+
+/* 16 byte pc partition descriptor that sits in MBR and EPBR.
+ * Note: multi-byte entities have little-endian layout on disk */
+struct pc_partition {
+ uint8_t status; /* byte 0 */
+ struct chs start; /* bytes 1-3 */
+ uint8_t type; /* byte 4 */
+ struct chs end; /* bytes 5-7 */
+ uint32_t start_lba; /* bytes 8-11 */
+ uint32_t len_lba; /* bytes 12-15 */
+} __attribute__((__packed__));
+
+struct pc_boot_record {
+ uint8_t code[440]; /* bytes 0-439 */
+ uint32_t disk_sig; /* bytes 440-443 */
+ uint16_t pad; /* bytes 444-445 */
+ struct pc_partition ptable[PC_NUM_BOOT_RECORD_PARTS]; /* bytes 446-509 */
+ uint16_t mbr_sig; /* bytes 510-511 */
+} __attribute__((__packed__));
+
+struct part_info {
+ char *name;
+ uint8_t flags;
+ uint8_t type;
+ uint32_t len_kb; /* in 1K-bytes */
+ uint32_t start_lba; /* the LBA where this partition begins */
+};
+
+struct disk_info {
+ char *device;
+ uint8_t scheme;
+ int sect_size; /* expected sector size in bytes. MUST BE POWER OF 2 */
+ uint32_t skip_lba; /* in sectors (1 unit of LBA) */
+ uint32_t num_lba; /* the size of the disk in LBA units */
+ struct part_info *part_lst;
+ int num_parts;
+};
+
+struct write_list {
+ struct write_list *next;
+ loff_t offset;
+ uint32_t len;
+ uint8_t data[0];
+};
+
+
+struct write_list *alloc_wl(uint32_t data_len);
+void free_wl(struct write_list *item);
+struct write_list *wlist_add(struct write_list **lst, struct write_list *item);
+void wlist_free(struct write_list *lst);
+int wlist_commit(int fd, struct write_list *lst, int test);
+
+struct disk_info *load_diskconfig(const char *fn, char *path_override);
+int dump_disk_config(struct disk_info *dinfo);
+int apply_disk_config(struct disk_info *dinfo, int test);
+char *find_part_device(struct disk_info *dinfo, const char *name);
+int process_disk_config(struct disk_info *dinfo);
+struct part_info *find_part(struct disk_info *dinfo, const char *name);
+
+int write_raw_image(const char *dst, const char *src, loff_t offset, int test);
+
+/* For MBR partition schemes */
+struct write_list *config_mbr(struct disk_info *dinfo);
+char *find_mbr_part(struct disk_info *dinfo, const char *name);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LIBS_DISKCONFIG_H */
View
20 libdiskconfig/Android.mk
@@ -0,0 +1,20 @@
+LOCAL_PATH := $(call my-dir)
+include $(CLEAR_VARS)
+
+ifneq ($(TARGET_SIMULATOR),true)
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := \
+ diskconfig.c \
+ diskutils.c \
+ write_lst.c \
+ config_mbr.c
+
+LOCAL_MODULE := libdiskconfig
+LOCAL_PRELINK_MODULE := false
+LOCAL_SYSTEM_SHARED_LIBRARIES := libcutils liblog libc
+
+include $(BUILD_SHARED_LIBRARY)
+
+endif # ! TARGET_SIMULATOR
View
325 libdiskconfig/config_mbr.c
@@ -0,0 +1,325 @@
+/* libs/diskconfig/diskconfig.c
+ *
+ * Copyright 2008, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "config_mbr"
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include <cutils/log.h>
+
+#include <diskconfig/diskconfig.h>
+
+
+/* start and len are in LBA units */
+static void
+cfg_pentry(struct pc_partition *pentry, uint8_t status, uint8_t type,
+ uint32_t start, uint32_t len)
+{
+ if (len > 0) {
+ /* seems that somes BIOSens can get wedged on boot while verifying
+ * the mbr if these are 0 */
+ memset(&pentry->start, 0xff, sizeof(struct chs));
+ memset(&pentry->end, 0xff, sizeof(struct chs));
+ } else {
+ /* zero out the c/h/s entries.. they are not used */
+ memset(&pentry->start, 0, sizeof(struct chs));
+ memset(&pentry->end, 0, sizeof(struct chs));
+ }
+
+ pentry->status = status;
+ pentry->type = type;
+ pentry->start_lba = start;
+ pentry->len_lba = len;
+
+ LOGI("Configuring pentry. status=0x%x type=0x%x start_lba=%u len_lba=%u",
+ pentry->status, pentry->type, pentry->start_lba, pentry->len_lba);
+}
+
+
+static inline uint32_t
+kb_to_lba(uint32_t len_kb, uint32_t sect_size)
+{
+ uint64_t lba;
+
+ lba = (uint64_t)len_kb * 1024;
+ /* bump it up to the next LBA boundary just in case */
+ lba = (lba + (uint64_t)sect_size - 1) & ~((uint64_t)sect_size - 1);
+ lba /= (uint64_t)sect_size;
+ if (lba >= 0xffffffffULL)
+ LOGE("Error converting kb -> lba. 32bit overflow, expect weirdness");
+ return (uint32_t)(lba & 0xffffffffULL);
+}
+
+
+static struct write_list *
+mk_pri_pentry(struct disk_info *dinfo, struct part_info *pinfo, int pnum,
+ uint32_t *lba)
+{
+ struct write_list *item;
+ struct pc_partition *pentry;
+
+ if (pnum >= PC_NUM_BOOT_RECORD_PARTS) {
+ LOGE("Maximum number of primary partition exceeded.");
+ return NULL;
+ }
+
+ if (!(item = alloc_wl(sizeof(struct pc_partition)))) {
+ LOGE("Unable to allocate memory for partition entry.");
+ return NULL;
+ }
+
+ {
+ /* DO NOT DEREFERENCE */
+ struct pc_boot_record *mbr = (void *)PC_MBR_DISK_OFFSET;
+ /* grab the offset in mbr where to write this partition entry. */
+ item->offset = (loff_t)((uint32_t)((uint8_t *)(&mbr->ptable[pnum])));
+ }
+
+ pentry = (struct pc_partition *) &item->data;
+
+ /* need a standard primary partition entry */
+ if (pinfo) {
+ /* need this to be 64 bit in case len_kb is large */
+ uint64_t len_lba;
+
+ if (pinfo->len_kb != (uint32_t)-1) {
+ /* bump it up to the next LBA boundary just in case */
+ len_lba = ((uint64_t)pinfo->len_kb * 1024);
+ len_lba += ((uint64_t)dinfo->sect_size - 1);
+ len_lba &= ~((uint64_t)dinfo->sect_size - 1);
+ len_lba /= (uint64_t)dinfo->sect_size;
+ } else {
+ /* make it fill the rest of disk */
+ len_lba = dinfo->num_lba - *lba;
+ }
+
+ cfg_pentry(pentry, ((pinfo->flags & PART_ACTIVE_FLAG) ?
+ PC_PART_ACTIVE : PC_PART_NORMAL),
+ pinfo->type, *lba, (uint32_t)len_lba);
+
+ pinfo->start_lba = *lba;
+ *lba += (uint32_t)len_lba;
+ } else {
+ /* this should be made an extended partition, and should take
+ * up the rest of the disk as a primary partition */
+ cfg_pentry(pentry, PC_PART_NORMAL, PC_PART_TYPE_EXTENDED,
+ *lba, dinfo->num_lba - *lba);
+
+ /* note that we do not update the *lba because we now have to
+ * create a chain of extended partition tables, and first one is at
+ * *lba */
+ }
+
+ return item;
+}
+
+
+/* This function configures an extended boot record at the beginning of an
+ * extended partition. This creates a logical partition and a pointer to
+ * the next EBR.
+ *
+ * ext_lba == The start of the toplevel extended partition (pointed to by the
+ * entry in the MBR).
+ */
+static struct write_list *
+mk_ext_pentry(struct disk_info *dinfo, struct part_info *pinfo, uint32_t *lba,
+ uint32_t ext_lba, struct part_info *pnext)
+{
+ struct write_list *item;
+ struct pc_boot_record *ebr;
+ uint32_t len; /* in lba units */
+
+ if (!(item = alloc_wl(sizeof(struct pc_boot_record)))) {
+ LOGE("Unable to allocate memory for EBR.");
+ return NULL;
+ }
+
+ /* we are going to write the ebr at the current LBA, and then bump the
+ * lba counter since that is where the logical data partition will start */
+ item->offset = (*lba) * dinfo->sect_size;
+ (*lba)++;
+
+ ebr = (struct pc_boot_record *) &item->data;
+ memset(ebr, 0, sizeof(struct pc_boot_record));
+ ebr->mbr_sig = PC_BIOS_BOOT_SIG;
+
+ if (pinfo->len_kb != (uint32_t)-1)
+ len = kb_to_lba(pinfo->len_kb, dinfo->sect_size);
+ else {
+ if (pnext) {
+ LOGE("Only the last partition can be specified to fill the disk "
+ "(name = '%s')", pinfo->name);
+ goto fail;
+ }
+ len = dinfo->num_lba - *lba;
+ /* update the pinfo structure to reflect the new size, for
+ * bookkeeping */
+ pinfo->len_kb =
+ (uint32_t)(((uint64_t)len * (uint64_t)dinfo->sect_size) /
+ ((uint64_t)1024));
+ }
+
+ cfg_pentry(&ebr->ptable[PC_EBR_LOGICAL_PART], PC_PART_NORMAL,
+ pinfo->type, 1, len);
+
+ pinfo->start_lba = *lba;
+ *lba += len;
+
+ /* If this is not the last partition, we have to create a link to the
+ * next extended partition.
+ *
+ * Otherwise, there's nothing to do since the "pointer entry" is
+ * already zero-filled.
+ */
+ if (pnext) {
+ /* The start lba for next partition is an offset from the beginning
+ * of the top-level extended partition */
+ uint32_t next_start_lba = *lba - ext_lba;
+ uint32_t next_len_lba;
+ if (pnext->len_kb != (uint32_t)-1)
+ next_len_lba = 1 + kb_to_lba(pnext->len_kb, dinfo->sect_size);
+ else
+ next_len_lba = dinfo->num_lba - *lba;
+ cfg_pentry(&ebr->ptable[PC_EBR_NEXT_PTR_PART], PC_PART_NORMAL,
+ PC_PART_TYPE_EXTENDED, next_start_lba, next_len_lba);
+ }
+
+ return item;
+
+fail:
+ free_wl(item);
+ return NULL;
+}
+
+
+struct write_list *
+config_mbr(struct disk_info *dinfo)
+{
+ struct part_info *pinfo;
+ uint32_t cur_lba = dinfo->skip_lba;
+ uint32_t ext_lba = 0;
+ struct write_list *wr_list = NULL;
+ struct write_list *temp_wr = NULL;
+ int cnt = 0;
+ int extended = 0;
+
+ if (!dinfo->part_lst)
+ return NULL;
+
+ for (cnt = 0; cnt < dinfo->num_parts; ++cnt) {
+ pinfo = &dinfo->part_lst[cnt];
+
+ /* Should we create an extedned partition? */
+ if (cnt == (PC_NUM_BOOT_RECORD_PARTS - 1)) {
+ if (cnt + 1 < dinfo->num_parts) {
+ extended = 1;
+ ext_lba = cur_lba;
+ if ((temp_wr = mk_pri_pentry(dinfo, NULL, cnt, &cur_lba)))
+ wlist_add(&wr_list, temp_wr);
+ else {
+ LOGE("Cannot create primary extended partition.");
+ goto fail;
+ }
+ }
+ }
+
+ /* if extended, need 1 lba for ebr */
+ if ((cur_lba + extended) >= dinfo->num_lba)
+ goto nospace;
+ else if (pinfo->len_kb != (uint32_t)-1) {
+ uint32_t sz_lba = (pinfo->len_kb / dinfo->sect_size) * 1024;
+ if ((cur_lba + sz_lba + extended) > dinfo->num_lba)
+ goto nospace;
+ }
+
+ if (!extended)
+ temp_wr = mk_pri_pentry(dinfo, pinfo, cnt, &cur_lba);
+ else {
+ struct part_info *pnext;
+ pnext = cnt + 1 < dinfo->num_parts ? &dinfo->part_lst[cnt+1] : NULL;
+ temp_wr = mk_ext_pentry(dinfo, pinfo, &cur_lba, ext_lba, pnext);
+ }
+
+ if (temp_wr)
+ wlist_add(&wr_list, temp_wr);
+ else {
+ LOGE("Cannot create partition %d (%s).", cnt, pinfo->name);
+ goto fail;
+ }
+ }
+
+ /* fill in the rest of the MBR with empty parts (if needed). */
+ for (; cnt < PC_NUM_BOOT_RECORD_PARTS; ++cnt) {
+ struct part_info blank;
+ cur_lba = 0;
+ memset(&blank, 0, sizeof(struct part_info));
+ if (!(temp_wr = mk_pri_pentry(dinfo, &blank, cnt, &cur_lba))) {
+ LOGE("Cannot create blank partition %d.", cnt);
+ goto fail;
+ }
+ wlist_add(&wr_list, temp_wr);
+ }
+
+ return wr_list;
+
+nospace:
+ LOGE("Not enough space to add parttion '%s'.", pinfo->name);
+
+fail:
+ wlist_free(wr_list);
+ return NULL;
+}
+
+
+/* Returns the device path of the partition referred to by 'name'
+ * Must be freed by the caller.
+ */
+char *
+find_mbr_part(struct disk_info *dinfo, const char *name)
+{
+ struct part_info *plist = dinfo->part_lst;
+ int num = 0;
+ char *dev_name = NULL;
+ int has_extended = (dinfo->num_parts > PC_NUM_BOOT_RECORD_PARTS);
+
+ for(num = 1; num <= dinfo->num_parts; ++num) {
+ if (!strcmp(plist[num-1].name, name))
+ break;
+ }
+
+ if (num > dinfo->num_parts)
+ return NULL;
+
+ if (has_extended && (num >= PC_NUM_BOOT_RECORD_PARTS))
+ num++;
+
+ if (!(dev_name = malloc(MAX_NAME_LEN))) {
+ LOGE("Cannot allocate memory.");
+ return NULL;
+ }
+
+ num = snprintf(dev_name, MAX_NAME_LEN, "%s%d", dinfo->device, num);
+ if (num >= MAX_NAME_LEN) {
+ LOGE("Device name is too long?!");
+ free(dev_name);
+ return NULL;
+ }
+
+ return dev_name;
+}
View
536 libdiskconfig/diskconfig.c
@@ -0,0 +1,536 @@
+/* libs/diskconfig/diskconfig.c
+ *
+ * Copyright 2008, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "diskconfig"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+
+#include <linux/fs.h>
+
+#include <cutils/config_utils.h>
+#include <cutils/log.h>
+
+#include <diskconfig/diskconfig.h>
+
+
+static int
+parse_len(const char *str, uint64_t *plen)
+{
+ char tmp[64];
+ int len_str;
+ uint32_t multiple = 1;
+
+ strncpy(tmp, str, sizeof(tmp));
+ tmp[sizeof(tmp)-1] = '\0';
+ len_str = strlen(tmp);
+ if (!len_str) {
+ LOGE("Invalid disk length specified.");
+ return 1;
+ }
+
+ switch(tmp[len_str - 1]) {
+ case 'M': case 'm':
+ /* megabyte */
+ multiple <<= 10;
+ case 'K': case 'k':
+ /* kilobytes */
+ multiple <<= 10;
+ tmp[len_str - 1] = '\0';
+ break;
+ default:
+ break;
+ }
+
+ *plen = strtoull(tmp, NULL, 0);
+ if (!*plen) {
+ LOGE("Invalid length specified: %s", str);
+ return 1;
+ }
+
+ if (*plen == (uint64_t)-1) {
+ if (multiple > 1) {
+ LOGE("Size modifier illegal when len is -1");
+ return 1;
+ }
+ } else {
+ /* convert len to kilobytes */
+ if (multiple > 1024)
+ multiple >>= 10;
+ *plen *= multiple;
+
+ if (*plen > 0xffffffffULL) {
+ LOGE("Length specified is too large!: %llu KB", *plen);
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+
+static int
+load_partitions(cnode *root, struct disk_info *dinfo)
+{
+ cnode *partnode;
+
+ dinfo->num_parts = 0;
+ for (partnode = root->first_child; partnode; partnode = partnode->next) {
+ struct part_info *pinfo = &dinfo->part_lst[dinfo->num_parts];
+ const char *tmp;
+
+ /* bleh, i will leak memory here, but i DONT CARE since
+ * the only right thing to do when this function fails
+ * is to quit */
+ pinfo->name = strdup(partnode->name);
+
+ if(config_bool(partnode, "active", 0))
+ pinfo->flags |= PART_ACTIVE_FLAG;
+
+ if (!(tmp = config_str(partnode, "type", NULL))) {
+ LOGE("Partition type required: %s", pinfo->name);
+ return 1;
+ }
+
+ /* possible values are: linux, fat32 */
+ if (!strcmp(tmp, "linux")) {
+ pinfo->type = PC_PART_TYPE_LINUX;
+ } else if (!strcmp(tmp, "fat32")) {
+ pinfo->type = PC_PART_TYPE_FAT32;
+ } else {
+ LOGE("Unsupported partition type found: %s", tmp);
+ return 1;
+ }
+
+ if ((tmp = config_str(partnode, "len", NULL)) != NULL) {
+ uint64_t len;
+ if (parse_len(tmp, &len))
+ return 1;
+ pinfo->len_kb = (uint32_t) len;
+ } else
+ pinfo->len_kb = 0;
+
+ ++dinfo->num_parts;
+ }
+
+ return 0;
+}
+
+struct disk_info *
+load_diskconfig(const char *fn, char *path_override)
+{
+ struct disk_info *dinfo;
+ cnode *devroot;
+ cnode *partnode;
+ cnode *root = config_node("", "");
+ const char *tmp;
+
+ if (!(dinfo = malloc(sizeof(struct disk_info)))) {
+ LOGE("Could not malloc disk_info");
+ return NULL;
+ }
+ memset(dinfo, 0, sizeof(struct disk_info));
+
+ if (!(dinfo->part_lst = malloc(MAX_NUM_PARTS * sizeof(struct part_info)))) {
+ LOGE("Could not malloc part_lst");
+ goto fail;
+ }
+ memset(dinfo->part_lst, 0,
+ (MAX_NUM_PARTS * sizeof(struct part_info)));
+
+ config_load_file(root, fn);
+ if (root->first_child == NULL) {
+ LOGE("Could not read config file %s", fn);
+ goto fail;
+ }
+
+ if (!(devroot = config_find(root, "device"))) {
+ LOGE("Could not find device section in config file '%s'", fn);
+ goto fail;
+ }
+
+
+ if (!(tmp = config_str(devroot, "path", path_override))) {
+ LOGE("device path is requried");
+ goto fail;
+ }
+ dinfo->device = strdup(tmp);
+
+ /* find the partition scheme */
+ if (!(tmp = config_str(devroot, "scheme", NULL))) {
+ LOGE("partition scheme is required");
+ goto fail;
+ } else if (!strcmp(tmp, "mbr")) {
+ dinfo->scheme = PART_SCHEME_MBR;
+ } else if (!strcmp(tmp, "gpt")) {
+ LOGE("'gpt' partition scheme not supported yet.");
+ goto fail;
+ } else {
+ LOGE("Unknown partition scheme specified: %s", tmp);
+ goto fail;
+ }
+
+ /* grab the sector size (in bytes) */
+ tmp = config_str(devroot, "sector_size", "512");
+ dinfo->sect_size = strtol(tmp, NULL, 0);
+ if (!dinfo->sect_size) {
+ LOGE("Invalid sector size: %s", tmp);
+ goto fail;
+ }
+
+ /* first lba where the partitions will start on disk */
+ if (!(tmp = config_str(devroot, "start_lba", NULL))) {
+ LOGE("start_lba must be provided");
+ goto fail;
+ }
+
+ if (!(dinfo->skip_lba = strtol(tmp, NULL, 0))) {
+ LOGE("Invalid starting LBA (or zero): %s", tmp);
+ goto fail;
+ }
+
+ /* Number of LBAs on disk */
+ if (!(tmp = config_str(devroot, "num_lba", NULL))) {
+ LOGE("num_lba is required");
+ goto fail;
+ }
+ dinfo->num_lba = strtoul(tmp, NULL, 0);
+
+ if (!(partnode = config_find(devroot, "partitions"))) {
+ LOGE("Device must specify partition list");
+ goto fail;
+ }
+
+ if (load_partitions(partnode, dinfo))
+ goto fail;
+
+ return dinfo;
+
+fail:
+ if (dinfo->part_lst)
+ free(dinfo->part_lst);
+ if (dinfo->device)
+ free(dinfo->device);
+ free(dinfo);
+ return NULL;
+}
+
+static int
+sync_ptable(int fd)
+{
+ struct stat stat;
+ int rv;
+
+ sync();
+
+ if (fstat(fd, &stat)) {
+ LOGE("Cannot stat, errno=%d.", errno);
+ return -1;
+ }
+
+ if (S_ISBLK(stat.st_mode) && ((rv = ioctl(fd, BLKRRPART, NULL)) < 0)) {
+ LOGE("Could not re-read partition table. REBOOT!. (errno=%d)", errno);
+ return -1;
+ }
+
+ return 0;
+}
+
+/* This function verifies that the disk info provided is valid, and if so,
+ * returns an open file descriptor.
+ *
+ * This does not necessarily mean that it will later be successfully written
+ * though. If we use the pc-bios partitioning scheme, we must use extended
+ * partitions, which eat up some hd space. If the user manually provisioned
+ * every single partition, but did not account for the extra needed space,
+ * then we will later fail.
+ *
+ * TODO: Make validation more complete.
+ */
+static int
+validate(struct disk_info *dinfo)
+{
+ int fd;
+ int sect_sz;
+ uint64_t disk_size;
+ uint64_t total_size;
+ int cnt;
+ struct stat stat;
+
+ if (!dinfo)
+ return -1;
+
+ if ((fd = open(dinfo->device, O_RDWR)) < 0) {
+ LOGE("Cannot open device '%s' (errno=%d)", dinfo->device, errno);
+ return -1;
+ }
+
+ if (fstat(fd, &stat)) {
+ LOGE("Cannot stat file '%s', errno=%d.", dinfo->device, errno);
+ goto fail;
+ }
+
+
+ /* XXX: Some of the code below is kind of redundant and should probably
+ * be refactored a little, but it will do for now. */
+
+ /* Verify that we can operate on the device that was requested.
+ * We presently only support block devices and regular file images. */
+ if (S_ISBLK(stat.st_mode)) {
+ /* get the sector size and make sure we agree */
+ if (ioctl(fd, BLKSSZGET, &sect_sz) < 0) {
+ LOGE("Cannot get sector size (errno=%d)", errno);
+ goto fail;
+ }
+
+ if (!sect_sz || sect_sz != dinfo->sect_size) {
+ LOGE("Device sector size is zero or sector sizes do not match!");
+ goto fail;
+ }
+
+ /* allow the user override the "disk size" if they provided num_lba */
+ if (!dinfo->num_lba) {
+ if (ioctl(fd, BLKGETSIZE64, &disk_size) < 0) {
+ LOGE("Could not get block device size (errno=%d)", errno);
+ goto fail;
+ }
+ /* XXX: we assume that the disk has < 2^32 sectors :-) */
+ dinfo->num_lba = (uint32_t)(disk_size / (uint64_t)dinfo->sect_size);
+ } else
+ disk_size = (uint64_t)dinfo->num_lba * (uint64_t)dinfo->sect_size;
+ } else if (S_ISREG(stat.st_mode)) {
+ LOGI("Requesting operation on a regular file, not block device.");
+ if (!dinfo->sect_size) {
+ LOGE("Sector size for regular file images cannot be zero");
+ goto fail;
+ }
+ if (dinfo->num_lba)
+ disk_size = (uint64_t)dinfo->num_lba * (uint64_t)dinfo->sect_size;
+ else {
+ dinfo->num_lba = (uint32_t)(stat.st_size / dinfo->sect_size);
+ disk_size = (uint64_t)stat.st_size;
+ }
+ } else {
+ LOGE("Device does not refer to a regular file or a block device!");
+ goto fail;
+ }
+
+#if 1
+ LOGV("Device/file %s: size=%llu bytes, num_lba=%u, sect_size=%d",
+ dinfo->device, disk_size, dinfo->num_lba, dinfo->sect_size);
+#endif
+
+ /* since this is our offset into the disk, we start off with that as
+ * our size of needed partitions */
+ total_size = dinfo->skip_lba * dinfo->sect_size;
+
+ /* add up all the partition sizes and make sure it fits */
+ for (cnt = 0; cnt < dinfo->num_parts; ++cnt) {
+ struct part_info *part = &dinfo->part_lst[cnt];
+ if (part->len_kb != (uint32_t)-1) {
+ total_size += part->len_kb * 1024;
+ } else if (part->len_kb == 0) {
+ LOGE("Zero-size partition '%s' is invalid.", part->name);
+ goto fail;
+ } else {
+ /* the partition requests the rest of the disk. */
+ if (cnt + 1 != dinfo->num_parts) {
+ LOGE("Only the last partition in the list can request to fill "
+ "the rest of disk.");
+ goto fail;
+ }
+ }
+
+ if ((part->type != PC_PART_TYPE_LINUX) &&
+ (part->type != PC_PART_TYPE_FAT32)) {
+ LOGE("Unknown partition type (0x%x) encountered for partition "
+ "'%s'\n", part->type, part->name);
+ goto fail;
+ }
+ }
+
+ /* only matters for disks, not files */
+ if (S_ISBLK(stat.st_mode) && total_size > disk_size) {
+ LOGE("Total requested size of partitions (%llu) is greater than disk "
+ "size (%llu).", total_size, disk_size);
+ goto fail;
+ }
+
+ return fd;
+
+fail:
+ close(fd);
+ return -1;
+}
+
+static int
+validate_and_config(struct disk_info *dinfo, int *fd, struct write_list **lst)
+{
+ *lst = NULL;
+ *fd = -1;
+
+ if ((*fd = validate(dinfo)) < 0)
+ return 1;
+
+ switch (dinfo->scheme) {
+ case PART_SCHEME_MBR:
+ *lst = config_mbr(dinfo);
+ return *lst == NULL;
+ case PART_SCHEME_GPT:
+ /* not supported yet */
+ default:
+ LOGE("Uknown partition scheme.");
+ break;
+ }
+
+ close(*fd);
+ *lst = NULL;
+ return 1;
+}
+
+/* validate and process the disk layout configuration.
+ * This will cause an update to the partitions' start lba.
+ *
+ * Basically, this does the same thing as apply_disk_config in test mode,
+ * except that wlist_commit is not called to print out the data to be
+ * written.
+ */
+int
+process_disk_config(struct disk_info *dinfo)
+{
+ struct write_list *lst;
+ int fd;
+
+ if (validate_and_config(dinfo, &fd, &lst) != 0)
+ return 1;
+
+ close(fd);
+ wlist_free(lst);
+ return 0;
+}
+
+
+int
+apply_disk_config(struct disk_info *dinfo, int test)
+{
+ int fd;
+ struct write_list *wr_lst = NULL;
+ int rv;
+
+ if (validate_and_config(dinfo, &fd, &wr_lst) != 0) {
+ LOGE("Configuration is invalid.");
+ goto fail;
+ }
+
+ if ((rv = wlist_commit(fd, wr_lst, test)) >= 0)
+ rv = test ? 0 : sync_ptable(fd);
+
+ close(fd);
+ wlist_free(wr_lst);
+ return rv;
+
+fail:
+ close(fd);
+ if (wr_lst)
+ wlist_free(wr_lst);
+ return 1;
+}
+
+int
+dump_disk_config(struct disk_info *dinfo)
+{
+ int cnt;
+ struct part_info *part;
+
+ printf("Device: %s\n", dinfo->device);
+ printf("Scheme: ");
+ switch (dinfo->scheme) {
+ case PART_SCHEME_MBR:
+ printf("MBR");
+ break;
+ case PART_SCHEME_GPT:
+ printf("GPT (unsupported)");
+ break;
+ default:
+ printf("Unknown");
+ break;
+ }
+ printf ("\n");
+
+ printf("Sector size: %d\n", dinfo->sect_size);
+ printf("Skip leading LBAs: %u\n", dinfo->skip_lba);
+ printf("Number of LBAs: %u\n", dinfo->num_lba);
+ printf("Partitions:\n");
+
+ for (cnt = 0; cnt < dinfo->num_parts; ++cnt) {
+ part = &dinfo->part_lst[cnt];
+ printf("\tname = %s\n", part->name);
+ printf("\t\tflags = %s\n",
+ part->flags & PART_ACTIVE_FLAG ? "Active" : "None");
+ printf("\t\ttype = %s\n",
+ part->type == PC_PART_TYPE_LINUX ? "Linux" : "Unknown");
+ if (part->len_kb == (uint32_t)-1)
+ printf("\t\tlen = rest of disk\n");
+ else
+ printf("\t\tlen = %uKB\n", part->len_kb);
+ }
+ printf("Total number of partitions: %d\n", cnt);
+ printf("\n");
+
+ return 0;
+}
+
+struct part_info *
+find_part(struct disk_info *dinfo, const char *name)
+{
+ struct part_info *pinfo;
+ int cnt;
+
+ for (cnt = 0; cnt < dinfo->num_parts; ++cnt) {
+ pinfo = &dinfo->part_lst[cnt];
+ if (!strcmp(pinfo->name, name))
+ return pinfo;
+ }
+
+ return NULL;
+}
+
+/* NOTE: If the returned ptr is non-NULL, it must be freed by the caller. */
+char *
+find_part_device(struct disk_info *dinfo, const char *name)
+{
+ switch (dinfo->scheme) {
+ case PART_SCHEME_MBR:
+ return find_mbr_part(dinfo, name);
+ case PART_SCHEME_GPT:
+ LOGE("GPT is presently not supported");
+ break;
+ default:
+ LOGE("Unknown partition table scheme");
+ break;
+ }
+
+ return NULL;
+}
+
+
View
117 libdiskconfig/diskutils.c
@@ -0,0 +1,117 @@
+/* libs/diskconfig/diskutils.c
+ *
+ * Copyright 2008, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "diskutils"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+#include <cutils/log.h>
+
+#include <diskconfig/diskconfig.h>
+
+int
+write_raw_image(const char *dst, const char *src, loff_t offset, int test)
+{
+ int dst_fd = -1;
+ int src_fd = -1;
+ uint8_t buffer[2048];
+ int nr_bytes;
+ int tmp;
+ int done = 0;
+ uint64_t total = 0;
+
+ LOGI("Writing RAW image '%s' to '%s' (offset=%llu)", src, dst, offset);
+ if ((src_fd = open(src, O_RDONLY)) < 0) {
+ LOGE("Could not open %s for reading (errno=%d).", src, errno);
+ goto fail;
+ }
+
+ if (!test) {
+ if ((dst_fd = open(dst, O_RDWR)) < 0) {
+ LOGE("Could not open '%s' for read/write (errno=%d).", dst, errno);
+ goto fail;
+ }
+
+ if (lseek64(dst_fd, offset, SEEK_SET) != offset) {
+ LOGE("Could not seek to offset %lld in %s.", offset, dst);
+ goto fail;
+ }
+ }
+
+ while (!done) {
+ if ((nr_bytes = read(src_fd, buffer, sizeof(buffer))) < 0) {
+ /* XXX: Should we not even bother with EINTR? */
+ if (errno == EINTR)
+ continue;
+ LOGE("Error (%d) while reading from '%s'", errno, src);
+ goto fail;
+ }
+
+ if (!nr_bytes) {
+ /* we're done. */
+ done = 1;
+ break;
+ }
+
+ total += nr_bytes;
+
+ /* skip the write loop if we're testing */
+ if (test)
+ nr_bytes = 0;
+
+ while (nr_bytes > 0) {
+ if ((tmp = write(dst_fd, buffer, nr_bytes)) < 0) {
+ /* XXX: Should we not even bother with EINTR? */
+ if (errno == EINTR)
+ continue;
+ LOGE("Error (%d) while writing to '%s'", errno, dst);
+ goto fail;
+ }
+ if (!tmp)
+ continue;
+ nr_bytes -= tmp;
+ }
+ }
+
+ if (!done) {
+ LOGE("Exited read/write loop without setting flag! WTF?!");
+ goto fail;
+ }
+
+ if (dst_fd >= 0)
+ fsync(dst_fd);
+
+ LOGI("Wrote %llu bytes to %s @ %lld", total, dst, offset);
+
+ close(src_fd);
+ if (dst_fd >= 0)
+ close(dst_fd);
+ return 0;
+
+fail:
+ if (dst_fd >= 0)
+ close(dst_fd);
+ if (src_fd >= 0)
+ close(src_fd);
+ return 1;
+}
View
42 libdiskconfig/dump_diskconfig.c
@@ -0,0 +1,42 @@
+/* libs/diskconfig/dump_diskconfig.c
+ *
+ * Copyright 2008, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "dump_diskconfig"
+#include <stdio.h>
+
+#include <cutils/log.h>
+
+#include "diskconfig.h"
+
+int
+main(int argc, char *argv[])
+{
+ struct disk_info *dinfo;
+
+ if (argc < 2) {
+ LOGE("usage: %s <conf file>", argv[0]);
+ return 1;
+ }
+
+ if (!(dinfo = load_diskconfig(argv[1], NULL)))
+ return 1;
+
+ dump_disk_config(dinfo);
+
+ return 0;
+}
+
View
92 libdiskconfig/write_lst.c
@@ -0,0 +1,92 @@
+/* libs/diskconfig/write_lst.c
+ *
+ * Copyright 2008, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "write_lst"
+#include <sys/types.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <cutils/log.h>
+
+#include <diskconfig/diskconfig.h>
+
+struct write_list *
+alloc_wl(uint32_t data_len)
+{
+ struct write_list *item;
+
+ if (!(item = malloc(sizeof(struct write_list) + data_len))) {
+ LOGE("Unable to allocate memory.");
+ return NULL;
+ }
+
+ item->len = data_len;
+ return item;
+}
+
+void
+free_wl(struct write_list *item)
+{
+ if (item)
+ free(item);
+}
+
+struct write_list *
+wlist_add(struct write_list **lst, struct write_list *item)
+{
+ item->next = (*lst);
+ *lst = item;
+ return item;
+}
+
+void
+wlist_free(struct write_list *lst)
+{
+ struct write_list *temp_wr;
+ while (lst) {
+ temp_wr = lst->next;
+ free_wl(lst);
+ lst = temp_wr;
+ }
+}
+
+int
+wlist_commit(int fd, struct write_list *lst, int test)
+{
+ for(; lst; lst = lst->next) {
+ if (lseek64(fd, lst->offset, SEEK_SET) != (loff_t)lst->offset) {
+ LOGE("Cannot seek to the specified position (%lld).", lst->offset);
+ goto fail;
+ }
+
+ if (!test) {
+ if (write(fd, lst->data, lst->len) != (int)lst->len) {
+ LOGE("Failed writing %u bytes at position %lld.", lst->len,
+ lst->offset);
+ goto fail;
+ }
+ } else
+ LOGI("Would write %d bytes @ offset %lld.", lst->len, lst->offset);
+ }
+
+ return 0;
+
+fail:
+ return -1;
+}
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