int default_write(uint64_t oid, struct siocb *iocb)
{
int flags = get_open_flags(oid, false), fd, ret = SD_RES_SUCCESS;
char path[PATH_MAX];
ssize_t size;
if (iocb->epoch < sys_epoch()) {
dprintf("%"PRIu32" sys %"PRIu32"\n", iocb->epoch, sys_epoch());
return SD_RES_OLD_NODE_VER;
}
get_obj_path(oid, path);
if (iocb->flags & SD_FLAG_CMD_CACHE && is_disk_cache_enabled())
flags &= ~O_DSYNC;
fd = open(path, flags, def_fmode);
if (fd < 0)
return err_to_sderr(oid, errno);
size = xpwrite(fd, iocb->buf, iocb->length, iocb->offset);
if (size != iocb->length) {
eprintf("failed to write object %"PRIx64", path=%s, offset=%"
PRId64", size=%"PRId32", result=%zd, %m\n", oid, path,
iocb->offset, iocb->length, size);
ret = err_to_sderr(oid, errno);
goto out;
}
out:
close(fd);
return ret;
}
static int get_open_flags(uint64_t oid, bool create, int fl)
{
int flags = O_DSYNC | O_RDWR;
if ((fl & SD_FLAG_CMD_CACHE && is_disk_cache_enabled()) ||
uatomic_is_true(&sys->use_journal) ||
sys->nosync == true)
flags &= ~O_DSYNC;
/*
* We can not use DIO for inode object because it is not 512B aligned.
*/
if (sys->backend_dio && is_data_obj(oid))
flags |= O_DIRECT;
if (create)
flags |= O_CREAT | O_EXCL;
return flags;
}
