Hi Andreas,
On Fri, Oct 09, 2015 at 03:27:18PM +0200, Andreas Fenkart wrote:
> starting 'kexec -l /dev/mmcblk0p1' fails since the size of
> a block device can not be determined with stat
Could you provide some motivation for kexec reading a kernel image
from a block device as per the example above?
> Signed-off-by: Andreas Fenkart <andreas.fenkart at dev.digitalstrom.org>
> ---
> kexec/kexec.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/kexec/kexec.c b/kexec/kexec.c
> index ff024f3..8b8846e 100644
> --- a/kexec/kexec.c
> +++ b/kexec/kexec.c
> @@ -26,7 +26,9 @@
> #include <stdlib.h>
> #include <errno.h>
> #include <limits.h>
> +#include <sys/ioctl.h>
> #include <sys/mman.h>
> +#include <sys/mount.h>
> #include <sys/types.h>
> #include <sys/stat.h>
> #include <sys/reboot.h>
> @@ -554,6 +556,14 @@ char *slurp_file(const char *filename, off_t *r_size)
> die("Can not seek to the begin of file %s: %s\n",
> filename, strerror(errno));
> buf = slurp_fd(fd, filename, size, &nread);
> + } else if (S_ISBLK(stats.st_mode)) {
> + /* taken from blockdev */
Is "blockdev" Linux kernel code?
> + unsigned long long llu = -1;
> + err = ioctl(fd, BLKGETSIZE64, &llu);
> + if (err < 0)
> + die("Can't retrieve size of block device %s: %s\n",
> + filename, strerror(errno));
> + size = llu;
> } else {
> size = nread = stats.st_size;
> buf = mmap(NULL, size,
> --
> 2.5.1
>
>
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>
