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https://github.com/projectacrn/acrn-hypervisor.git
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tools: acrn-crashlog: New apis to replace losetup and fdisk
This patch adds new apis to replace commands losetup and fdisk. Main changes include: 1. impletement apis to operate loop devices directly. 2. impletement apis to get partition information from image file. Signed-off-by: Liu, Xinwu <xinwu.liu@intel.com> Acked-by: Chen Gang <gang.c.chen@intel.com>
This commit is contained in:
Liu, Xinwu
lijinxia
parent
c01e675582
commit
db05675f38
@ -3,7 +3,7 @@ MINOR_VERSION=0
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VERSION_H = $(BUILDDIR)/include/acrnprobe/version.h
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LIBS = -lpthread -lxml2 -lcrypto -lrt $(EXTRA_LIBS)
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LIBS = -lpthread -lxml2 -lcrypto -lrt -lblkid $(EXTRA_LIBS)
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INCLUDE += -I $(CURDIR)/include -I /usr/include/libxml2
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INCLUDE += -I $(BUILDDIR)/include/acrnprobe
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CFLAGS += $(INCLUDE)
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@ -36,7 +36,8 @@ $(BUILDDIR)/acrnprobe/bin/acrnprobe: $(BUILDDIR)/acrnprobe/obj/main.o \
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$(BUILDDIR)/acrnprobe/obj/property.o \
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$(BUILDDIR)/acrnprobe/obj/probeutils.o \
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$(BUILDDIR)/acrnprobe/obj/history.o \
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$(BUILDDIR)/acrnprobe/obj/android_events.o
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$(BUILDDIR)/acrnprobe/obj/android_events.o \
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$(BUILDDIR)/acrnprobe/obj/loop.o
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$(CC) -o $@ $^ $(LDFLAGS)
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.PHONY: clean
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232
tools/acrn-crashlog/acrnprobe/loop.c
Normal file
232
tools/acrn-crashlog/acrnprobe/loop.c
Normal file
@ -0,0 +1,232 @@
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/*
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* Copyright (C) 2018 Intel Corporation
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <stdio.h>
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#include <fcntl.h>
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#include <linux/loop.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <blkid/blkid.h>
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#include <ext2fs/ext2fs.h>
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#include "log_sys.h"
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#define DEV_LOOP_CTL "/dev/loop-control"
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static int get_par_startaddr_from_img(const char *img,
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const char *target_parname,
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unsigned long long *start)
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{
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blkid_probe pr;
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blkid_partlist ls;
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blkid_partition par;
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int i;
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int nparts;
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const char *par_name;
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unsigned int sector_size;
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unsigned long long par_start;
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if (!img || !target_parname || !start)
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return -1;
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pr = blkid_new_probe_from_filename(img);
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if (!pr) {
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LOGE("blkid new probe failed\n");
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return -1;
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}
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ls = blkid_probe_get_partitions(pr);
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if (!ls) {
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LOGE("blkid get partitions failed\n");
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goto err;
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}
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nparts = blkid_partlist_numof_partitions(ls);
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if (nparts <= 0) {
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LOGE("(%d) partitions in (%s)??\n", nparts, img);
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goto err;
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}
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for (i = 0; i < nparts; i++) {
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par = blkid_partlist_get_partition(ls, i);
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par_name = blkid_partition_get_name(par);
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if (!par_name) {
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LOGW("A partition in (%s) don't have name??\n", img);
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continue;
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}
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if (!strcmp(par_name, target_parname))
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goto found;
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}
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LOGE("no partition of (%s) is named %s\n", img, target_parname);
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err:
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blkid_free_probe(pr);
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return -1;
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found:
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sector_size = blkid_probe_get_sectorsize(pr);
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par_start = (unsigned long long)blkid_partition_get_start(par);
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*start = par_start * sector_size;
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blkid_free_probe(pr);
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return 0;
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}
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int loopdev_num_get_free(void)
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{
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int loopctlfd;
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int devnr;
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loopctlfd = open(DEV_LOOP_CTL, O_RDONLY);
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if (loopctlfd == -1) {
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LOGE("failed to open %s, error (%s)\n", DEV_LOOP_CTL,
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strerror(errno));
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return -errno;
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}
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devnr = ioctl(loopctlfd, LOOP_CTL_GET_FREE);
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if (devnr == -1) {
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LOGE("failed to get free loopdev, error (%s)\n",
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strerror(errno));
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close(loopctlfd);
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return -errno;
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}
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close(loopctlfd);
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return devnr;
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}
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static int loopdev_set_status(const char *loopdev,
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const struct loop_info64 *info)
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{
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int loopfd;
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int res;
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if (!loopdev || !info)
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return -EINVAL;
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loopfd = open(loopdev, O_RDWR);
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if (loopfd == -1) {
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LOGE("failed to open (%s), error(%s)\n", loopdev,
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strerror(errno));
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return -errno;
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}
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res = ioctl(loopfd, LOOP_SET_STATUS64, info);
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if (res == -1) {
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LOGE("failed to set info to (%s), error(%s)\n", loopdev,
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strerror(errno));
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close(loopfd);
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return -errno;
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}
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close(loopfd);
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return 0;
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}
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static int loopdev_set_img(const char *loopdev, const char *img_path)
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{
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int loopfd;
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int imgfd;
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int res;
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if (!loopdev || !img_path)
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return -EINVAL;
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loopfd = open(loopdev, O_WRONLY);
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if (loopfd == -1) {
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LOGE("failed to open %s, error (%s)\n", loopdev,
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strerror(errno));
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return -errno;
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}
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imgfd = open(img_path, O_RDONLY);
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if (imgfd == -1) {
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LOGE("failed to open %s, error (%s)\n", img_path,
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strerror(errno));
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close(loopfd);
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return -errno;
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}
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res = ioctl(loopfd, LOOP_SET_FD, imgfd);
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if (res == -1) {
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LOGE("failed to set (%s) to (%s), error (%s)\n", img_path,
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loopdev, strerror(errno));
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close(loopfd);
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close(imgfd);
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return -errno;
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}
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close(loopfd);
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close(imgfd);
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return 0;
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}
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int loopdev_set_img_par(const char *loopdev, const char *img_path,
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const char *parname)
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{
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struct loop_info64 info;
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unsigned long long par_start;
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int res;
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if (!loopdev || !img_path || !parname)
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return -1;
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res = get_par_startaddr_from_img(img_path, parname, &par_start);
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if (res == -1) {
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LOGE("failed to get data par startaddr\n");
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return -1;
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}
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res = loopdev_set_img(loopdev, img_path);
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if (res) {
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LOGE("failed to set img (%s) to (%s), error (%s)\n",
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img_path, loopdev, strerror(-res));
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return -1;
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}
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memset(&info, 0, sizeof(info));
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info.lo_offset = par_start;
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res = loopdev_set_status(loopdev, &info);
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if (res < 0) {
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LOGE("failed to set loopdev, error (%s)\n", strerror(-res));
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return -1;
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}
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return 0;
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}
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int loopdev_check_parname(const char *loopdev, const char *parname)
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{
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struct ext2_super_block super;
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int fd;
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const int skiprate = 512;
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loff_t sk = 0;
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if (!loopdev || !parname)
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return -ENOENT;
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/* quickly find super block */
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fd = open(loopdev, O_RDONLY);
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if (fd == -1) {
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LOGE("failed to open (%s), error(%s)\n", loopdev,
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strerror(errno));
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return -errno;
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}
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for (; lseek64(fd, sk, SEEK_SET) != -1 &&
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read(fd, &super, 512) == 512; sk += skiprate) {
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if (super.s_magic != EXT2_SUPER_MAGIC)
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continue;
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LOGD("find super block at +%ld\n", sk);
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/* only look into the primary super block */
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if (super.s_volume_name[0]) {
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close(fd);
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return !strcmp(super.s_volume_name, parname);
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}
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break;
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}
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close(fd);
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return 0;
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}
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