CTEST(file, directio)
{
int r;
int fd;
const char *dbname = "file-test.brt";
char *datas = (char*)xmalloc_aligned(512, 1024);
memset(datas, 0, 512);
fd = ness_os_open_direct(dbname, O_CREAT | O_RDWR, 0777);
ASSERT_TRUE(fd > 0);
r = ness_os_pwrite(fd, datas, 512, 512UL);
ASSERT_EQUAL(0, r);
xfree(datas);
ness_os_close(fd);
}
struct tree *tree_open(const char *dbname,
struct env *e,
struct tree_callback *tcb) {
int fd;
int flag;
mode_t mode;
int is_create = 0;
struct tree *t;
struct node *root;
struct cache_file *cf;
t = xcalloc(1, sizeof(*t));
t->e = e;
mode = S_IRWXU | S_IRWXG | S_IRWXO;
flag = O_RDWR | O_BINARY;
if (e->use_directio)
fd = ness_os_open_direct(dbname, flag, mode);
else
fd = ness_os_open(dbname, flag, mode);
if (fd == -1) {
if (e->use_directio)
fd = ness_os_open(dbname, flag | O_CREAT, mode);
else
fd = ness_os_open_direct(dbname, flag | O_CREAT, mode);
if (fd == -1)
goto ERR;
is_create = 1;
}
t->fd = fd;
t->hdr = hdr_new(e);
/* tree header */
if (!is_create) {
tcb->fetch_hdr_cb(fd, t->hdr);
}
/* create cache file */
cf = cache_file_create(e->cache, t->fd, t->hdr, tcb);
t->cf = cf;
/* tree root node */
if (is_create) {
NID nid = hdr_next_nid(t->hdr);
node_create(nid, 0, 1, t->hdr->version, t->e, &root);
cache_put_and_pin(cf, nid, root);
root->isroot = 1;
node_set_dirty(root);
cache_unpin(cf, root->cpair, make_cpair_attr(root));
t->hdr->root_nid = root->nid;
__DEBUG("create new root, NID %"PRIu64, root->nid);
} else {
/* get the root node */
if (cache_get_and_pin(cf, t->hdr->root_nid, (void**)&root, L_READ) != NESS_OK)
__PANIC("get root from cache error [%" PRIu64 "]", t->hdr->root_nid);
root->isroot = 1;
cache_unpin(cf, root->cpair, make_cpair_attr(root));
__DEBUG("fetch root, NID %"PRIu64, root->nid);
}
return t;
ERR:
xfree(t);
return NESS_ERR;
}