Attachment 107360 Details for Bug 84689 – The test program which reproduces bug in systemd-gpt-auto-generator

The test program which reproduces bug in systemd-gpt-auto-generator

test.c (text/plain), 2.75 KB, created by Maxim Mikityanskiy on 2014-10-05 16:44:04 UTC

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Creator: Maxim Mikityanskiy

Created: 2014-10-05 16:44:04 UTC

Size: 2.75 KB

patch

obsolete

>#include <unistd.h>
>#include <stdlib.h>
>#include <fcntl.h>
>#include <sys/ioctl.h>
>#include <sys/statfs.h>
>#include <blkid/blkid.h>
>#include <linux/btrfs.h>
>
>#include <assert.h>
>#include <errno.h>
>#include <sys/stat.h>
>#include <stdio.h>
>#include <linux/magic.h>
>
>static inline void closep(int *fd) {
>	if (*fd >= 0)
>		close(*fd);
>}
>
>#define _cleanup_close_ __attribute__((cleanup(closep)))
>
>#define F_TYPE_EQUAL(a, b) (a == (typeof(a)) b)
>
>static int get_btrfs_block_device(const char *path, dev_t *dev) {
>        struct btrfs_ioctl_fs_info_args fsi = {};
>        _cleanup_close_ int fd = -1;
>        uint64_t id;
>
>        assert(path);
>        assert(dev);
>
>	fprintf(stderr, "open\n");
>        fd = open(path, O_DIRECTORY|O_CLOEXEC);
>        if (fd < 0)
>                return -errno;
>
>	fprintf(stderr, "ioctl\n");
>        if (ioctl(fd, BTRFS_IOC_FS_INFO, &fsi) < 0)
>                return -errno;
>
>        /* We won't do this for btrfs RAID */
>        if (fsi.num_devices != 1)
>                return 0;
>
>        for (id = 1; id <= fsi.max_id; id++) {
>                struct btrfs_ioctl_dev_info_args di = {
>                        .devid = id,
>                };
>                struct stat st;
>
>		fprintf(stderr, "ioctl in loop\n");
>                if (ioctl(fd, BTRFS_IOC_DEV_INFO, &di) < 0) {
>                        if (errno == ENODEV)
>                                continue;
>
>                        return -errno;
>                }
>
>		fprintf(stderr, "stat in loop: '%s'\n", (char *)di.path);
>                if (stat((char*) di.path, &st) < 0)
>                        return -errno;
>
>		fprintf(stderr, "S_ISBLK in loop\n");
>                if (!S_ISBLK(st.st_mode))
>                        return -ENODEV;
>
>		fprintf(stderr, "major in loop\n");
>                if (major(st.st_rdev) == 0)
>                        return -ENODEV;
>
>		fprintf(stderr, "good in loop\n");
>                *dev = st.st_rdev;
>                return 1;
>        }
>
>        return -ENODEV;
>}
>
>static int get_block_device(const char *path, dev_t *dev) {
>        struct stat st;
>        struct statfs sfs;
>
>        assert(path);
>        assert(dev);
>
>	fprintf(stderr, "lstat\n");
>        if (lstat(path, &st))
>                return -errno;
>
>	fprintf(stderr, "major\n");
>        if (major(st.st_dev) != 0) {
>                *dev = st.st_dev;
>                return 1;
>        }
>
>	fprintf(stderr, "statfs\n");
>        if (statfs(path, &sfs) < 0)
>                return -errno;
>
>        if (F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC))
>                return get_btrfs_block_device(path, dev);
>
>        return 0;
>}
>
>__attribute__((noreturn)) int main()
>{
>	system("mountpoint -q /proc || mount proc /proc -t proc");
>	system("mount");
>
>	dev_t dev;
>	int res = get_block_device("/", &dev);
>	fprintf(stderr, "%d\n", res);
>	for (;;) {}
>}

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