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 <[email protected]> > --- > 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 > > > _______________________________________________ > kexec mailing list > [email protected] > http://lists.infradead.org/mailman/listinfo/kexec > _______________________________________________ kexec mailing list [email protected] http://lists.infradead.org/mailman/listinfo/kexec
