int main(int argc, char *argv[]) { return memlock(argc, argv); }
int dev_open_flags(struct device *dev, int flags, int direct, int quiet)
{
struct stat buf;
const char *name;
int need_excl = 0, need_rw = 0;
if ((flags & O_ACCMODE) == O_RDWR)
need_rw = 1;
if ((flags & O_EXCL))
need_excl = 1;
if (dev->fd >= 0) {
if (((dev->flags & DEV_OPENED_RW) || !need_rw) &&
((dev->flags & DEV_OPENED_EXCL) || !need_excl)) {
dev->open_count++;
return 1;
}
if (dev->open_count && !need_excl) {
/* FIXME Ensure we never get here */
log_debug("WARNING: %s already opened read-only",
dev_name(dev));
dev->open_count++;
}
dev_close_immediate(dev);
}
if (memlock())
log_error("WARNING: dev_open(%s) called while suspended",
dev_name(dev));
if (dev->flags & DEV_REGULAR)
name = dev_name(dev);
else if (!(name = dev_name_confirmed(dev, quiet)))
return_0;
if (!(dev->flags & DEV_REGULAR)) {
if (stat(name, &buf) < 0) {
log_sys_error("%s: stat failed", name);
return 0;
}
if (buf.st_rdev != dev->dev) {
log_error("%s: device changed", name);
return 0;
}
}
#ifdef O_DIRECT_SUPPORT
if (direct) {
if (!(dev->flags & DEV_O_DIRECT_TESTED))
dev->flags |= DEV_O_DIRECT;
if ((dev->flags & DEV_O_DIRECT))
flags |= O_DIRECT;
}
#endif
#ifdef O_NOATIME
/* Don't update atime on device inodes */
if (!(dev->flags & DEV_REGULAR))
flags |= O_NOATIME;
#endif
if ((dev->fd = open(name, flags, 0777)) < 0) {
#ifdef O_DIRECT_SUPPORT
if (direct && !(dev->flags & DEV_O_DIRECT_TESTED)) {
flags &= ~O_DIRECT;
if ((dev->fd = open(name, flags, 0777)) >= 0) {
dev->flags &= ~DEV_O_DIRECT;
log_debug("%s: Not using O_DIRECT", name);
goto opened;
}
}
#endif
if (quiet)
log_sys_debug("open", name);
else
log_sys_error("open", name);
return 0;
}
#ifdef O_DIRECT_SUPPORT
opened:
if (direct)
dev->flags |= DEV_O_DIRECT_TESTED;
#endif
dev->open_count++;
dev->flags &= ~DEV_ACCESSED_W;
if (need_rw)
dev->flags |= DEV_OPENED_RW;
else
dev->flags &= ~DEV_OPENED_RW;
if (need_excl)
dev->flags |= DEV_OPENED_EXCL;
else
dev->flags &= ~DEV_OPENED_EXCL;
if (!(dev->flags & DEV_REGULAR) &&
((fstat(dev->fd, &buf) < 0) || (buf.st_rdev != dev->dev))) {
log_error("%s: fstat failed: Has device name changed?", name);
dev_close_immediate(dev);
return 0;
}
#ifndef O_DIRECT_SUPPORT
if (!(dev->flags & DEV_REGULAR))
dev_flush(dev);
#endif
if ((flags & O_CREAT) && !(flags & O_TRUNC))
dev->end = lseek(dev->fd, (off_t) 0, SEEK_END);
dm_list_add(&_open_devices, &dev->open_list);
log_debug("Opened %s %s%s%s", dev_name(dev),
dev->flags & DEV_OPENED_RW ? "RW" : "RO",
dev->flags & DEV_OPENED_EXCL ? " O_EXCL" : "",
dev->flags & DEV_O_DIRECT ? " O_DIRECT" : "");
return 1;
}
