For many operations we don't need a writable device. So if
opening O_RDWR fails in open_dev_excl, then try again O_RDONLY.
If we really needed write, a subsequent operation will failed. But
if we didn't, we succeed when otherwise we wouldn't have.
Signed-off-by: NeilBrown <neilb@suse.de>
{
char buf[20];
int i;
+ int flags = O_RDWR;
sprintf(buf, "%d:%d", dev2major(devnum), dev2minor(devnum));
for (i=0 ; i<25 ; i++) {
- int fd = dev_open(buf, O_RDWR|O_EXCL);
+ int fd = dev_open(buf, flags|O_EXCL);
if (fd >= 0)
return fd;
+ if (errno == EACCES && flags == O_RDWR) {
+ flags = O_RDONLY;
+ continue;
+ }
if (errno != EBUSY)
return fd;
usleep(200000);