static int _validate_cs_(nspace *vol, uint32 cluster, uint32 sector)
{
if (sector < 0) return -1;
if ((vol->fat_bits != 32) && IS_FIXED_ROOT(cluster)) { // fat12 or fat16 root
if (sector >= vol->root_sectors)
return -1;
return 0;
}
if (sector >= vol->sectors_per_cluster) return -1;
if (!IS_DATA_CLUSTER(cluster)) return -1;
return 0;
}
static status_t
get_next_dirent(nspace *vol, vnode *dir, struct diri *iter, ino_t *vnid,
char *filename, int len)
{
struct _dirent_info_ info;
status_t result;
do {
result = _next_dirent_(iter, &info, filename, len);
if (result < 0)
return result;
// only hide volume label entries in the root directory
} while ((info.mode & FAT_VOLUME) && (dir->vnid == vol->root_vnode.vnid));
if (!strcmp(filename, ".")) {
// assign vnode based on parent
if (vnid) *vnid = dir->vnid;
} else if (!strcmp(filename, "..")) {
// assign vnode based on parent of parent
if (vnid) *vnid = dir->dir_vnid;
} else {
if (vnid) {
ino_t loc = (IS_DATA_CLUSTER(info.cluster))
? GENERATE_DIR_CLUSTER_VNID(dir->vnid, info.cluster)
: GENERATE_DIR_INDEX_VNID(dir->vnid, info.sindex);
bool added_to_vcache = false;
/* if it matches a loc in the lookup table, we are done. */
result = vcache_loc_to_vnid(vol, loc, vnid);
if (result == ENOENT) {
/* ...else check if it matches any vnid's in the lookup table */
if (find_vnid_in_vcache(vol, loc) == B_OK) {
/* if it does, create a random one since we can't reuse
* existing vnid's */
*vnid = generate_unique_vnid(vol);
/* and add it to the vcache */
if ((result = add_to_vcache(vol, *vnid, loc)) < 0)
return result;
added_to_vcache = true;
} else {
/* otherwise we are free to use it */
*vnid = loc;
}
} else if (result != B_OK) {
dprintf("get_next_dirent: unknown error (%s)\n",
strerror(result));
return result;
}
if (info.mode & FAT_SUBDIR) {
if (dlist_find(vol, info.cluster) == -1LL) {
if ((result = dlist_add(vol, *vnid)) < 0) {
if (added_to_vcache)
remove_from_vcache(vol, *vnid);
return result;
}
}
}
}
}
DPRINTF(2, ("get_next_dirent: found %s (vnid %Lx)\n", filename,
vnid != NULL ? *vnid : (ino_t)0));
return B_NO_ERROR;
}
