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#include <camellia/errno.h>
#include <camellia/fsutil.h>
#include <kernel/arch/amd64/driver/driver.h>
#include <kernel/arch/amd64/driver/util.h>
#include <kernel/malloc.h>
#include <kernel/panic.h>
#include <kernel/proc.h>
#include <kernel/util.h>
#include <kernel/vfs/mount.h>
#include <kernel/vfs/request.h>
#include <shared/mem.h>
enum {
Hbase,
Hkdev,
};
static int
get_kdev(char *lst)
{
int len = 0;
for (VfsMount *m = vfs_mount_seed(); m; m = m->prev) {
if (m->prefix_len == 0) {
continue; /* that's us */
}
assert(m->prefix_len > 6);
assert(memcmp(m->prefix, "/kdev/", 6) == 0);
len += m->prefix_len - 6 + 1;
if (lst) {
memcpy(lst, m->prefix + 6, m->prefix_len - 6);
lst += m->prefix_len - 6;
*lst++ = '\0';
}
}
return len;
}
static long
handle(VfsReq *req)
{
static char *kdev = NULL;
static int kdev_len = 0;
const char *lst = NULL;
int len = 0;
if (!req->caller) return -1;
if (req->type != VFSOP_OPEN) {
switch ((uintptr_t __force)req->id) {
case Hbase:
lst = "kdev/";
len = strlen(lst) + 1;
break;
case Hkdev:
if (!kdev) {
kdev_len = get_kdev(NULL);
kdev = kmalloc(kdev_len);
get_kdev(kdev);
}
lst = kdev;
len = kdev_len;
break;
default:
assert(false);
}
}
switch (req->type) {
case VFSOP_OPEN:
if (reqpathcmp(req, "/")) return Hbase;
if (reqpathcmp(req, "/kdev/")) return Hkdev;
return -ENOENT;
case VFSOP_READ:
return req_readcopy(req, lst, len);
case VFSOP_GETSIZE:
return len;
default:
return -ENOSYS;
}
}
static void
accept(VfsReq *req)
{
vfsreq_finish_short(req, handle(req));
}
void
vfs_root_init(void)
{
vfs_root_register("", accept);
}
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