/*===========================================================================*
* do_vm_call *
*===========================================================================*/
int do_vm_call(void)
{
/* A call that VM does to VFS.
* We must reply with the fixed type VM_VFS_REPLY (and put our result info
* in the rest of the message) so VM can tell the difference between a
* request from VFS and a reply to this call.
*/
int req = job_m_in.VFS_VMCALL_REQ;
int req_fd = job_m_in.VFS_VMCALL_FD;
u32_t req_id = job_m_in.VFS_VMCALL_REQID;
endpoint_t ep = job_m_in.VFS_VMCALL_ENDPOINT;
u64_t offset = job_m_in.VFS_VMCALL_OFFSET;
u32_t length = job_m_in.VFS_VMCALL_LENGTH;
int result = OK;
int slot;
struct fproc *rfp, *vmf;
struct filp *f = NULL;
int r;
if(job_m_in.m_source != VM_PROC_NR)
return ENOSYS;
if(isokendpt(ep, &slot) != OK) rfp = NULL;
else rfp = &fproc[slot];
vmf = fproc_addr(VM_PROC_NR);
assert(fp == vmf);
assert(rfp != vmf);
switch(req) {
case VMVFSREQ_FDLOOKUP:
{
int procfd;
/* Lookup fd in referenced process. */
if(!rfp) {
printf("VFS: why isn't ep %d here?!\n", ep);
result = ESRCH;
goto reqdone;
}
if((result = dupvm(rfp, req_fd, &procfd, &f)) != OK) {
#if 0 /* Noisy diagnostic for mmap() by ld.so */
printf("vfs: dupvm failed\n");
#endif
goto reqdone;
}
if(S_ISBLK(f->filp_vno->v_mode)) {
assert(f->filp_vno->v_sdev != NO_DEV);
job_m_out.VMV_DEV = f->filp_vno->v_sdev;
job_m_out.VMV_INO = VMC_NO_INODE;
job_m_out.VMV_SIZE_PAGES = LONG_MAX;
} else {
job_m_out.VMV_DEV = f->filp_vno->v_dev;
job_m_out.VMV_INO = f->filp_vno->v_inode_nr;
job_m_out.VMV_SIZE_PAGES =
roundup(f->filp_vno->v_size,
PAGE_SIZE)/PAGE_SIZE;
}
job_m_out.VMV_FD = procfd;
result = OK;
break;
}
case VMVFSREQ_FDCLOSE:
{
result = close_fd(fp, req_fd);
if(result != OK) {
printf("VFS: VM fd close for fd %d, %d (%d)\n",
req_fd, fp->fp_endpoint, result);
}
break;
}
case VMVFSREQ_FDIO:
{
result = actual_lseek(fp, req_fd, SEEK_SET, offset,
NULL);
if(result == OK) {
result = actual_read_write_peek(fp, PEEKING,
req_fd, /* vir_bytes */ 0, length);
}
break;
}
default:
panic("VFS: bad request code from VM\n");
break;
}
reqdone:
if(f)
unlock_filp(f);
/* fp is VM still. */
assert(fp == vmf);
job_m_out.VMV_ENDPOINT = ep;
job_m_out.VMV_RESULT = result;
job_m_out.VMV_REQID = req_id;
/* Reply asynchronously as VM may not be able to receive
* an ipc_sendnb() message.
*/
job_m_out.m_type = VM_VFS_REPLY;
r = asynsend3(VM_PROC_NR, &job_m_out, 0);
if(r != OK) printf("VFS: couldn't asynsend3() to VM\n");
/* VFS does not reply any further */
return SUSPEND;
}
/*===========================================================================*
* do_read_write_peek *
*===========================================================================*/
int do_read_write_peek(int rw_flag, int io_fd, vir_bytes io_buf, size_t io_nbytes)
{
return actual_read_write_peek(fp, rw_flag, io_fd, io_buf, io_nbytes);
}