146 lines
3.6 KiB
C
146 lines
3.6 KiB
C
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/* Sending requests to VFS and handling the replies. */
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#define _SYSTEM 1
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#include <minix/callnr.h>
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#include <minix/com.h>
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#include <minix/config.h>
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#include <minix/const.h>
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#include <minix/ds.h>
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#include <minix/endpoint.h>
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#include <minix/minlib.h>
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#include <minix/type.h>
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#include <minix/ipc.h>
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#include <minix/sysutil.h>
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#include <minix/syslib.h>
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#include <minix/type.h>
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#include <minix/bitmap.h>
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#include <string.h>
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#include <errno.h>
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#include <env.h>
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#include <unistd.h>
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#include <assert.h>
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#include <sys/param.h>
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#include "proto.h"
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#include "glo.h"
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#include "util.h"
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#include "region.h"
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#include "sanitycheck.h"
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#define STATELEN 70
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static struct vfs_request_node {
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message reqmsg;
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char reqstate[STATELEN];
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void *opaque;
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endpoint_t who;
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int req_id;
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vfs_callback_t callback;
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struct vfs_request_node *next;
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} *first_queued, *active;
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static void activate(void)
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{
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assert(!active);
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assert(first_queued);
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active = first_queued;
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first_queued = first_queued->next;
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if(asynsend3(VFS_PROC_NR, &active->reqmsg, AMF_NOREPLY) != OK)
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panic("VM: asynsend to VFS failed");
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}
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#define ID_MAX LONG_MAX
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/*===========================================================================*
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* vfs_request *
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*===========================================================================*/
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int vfs_request(int reqno, int fd, struct vmproc *vmp, u64_t offset, u32_t len,
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vfs_callback_t reply_callback, void *cbarg, void *state, int statelen)
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{
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/* Perform an asynchronous request to VFS.
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* We send a message of type VFS_VMCALL to VFS. VFS will respond
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* with message type VM_VFS_REPLY. We send the request asynchronously
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* and then handle the reply as it if were a VM_VFS_REPLY request.
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*/
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message *m;
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static int reqid = 0;
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struct vfs_request_node *reqnode;
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reqid++;
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assert(statelen <= STATELEN);
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if(!SLABALLOC(reqnode)) {
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printf("vfs_request: no memory for request node\n");
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return ENOMEM;
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}
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m = &reqnode->reqmsg;
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memset(m, 0, sizeof(*m));
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m->m_type = VFS_VMCALL;
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m->VFS_VMCALL_REQ = reqno;
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m->VFS_VMCALL_FD = fd;
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m->VFS_VMCALL_REQID = reqid;
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m->VFS_VMCALL_ENDPOINT = vmp->vm_endpoint;
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m->VFS_VMCALL_OFFSET_LO = ex64lo(offset);
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m->VFS_VMCALL_OFFSET_HI = ex64hi(offset);
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m->VFS_VMCALL_LENGTH = len;
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reqnode->who = vmp->vm_endpoint;
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reqnode->req_id = reqid;
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reqnode->next = first_queued;
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reqnode->callback = reply_callback;
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reqnode->opaque = cbarg;
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if(state) memcpy(reqnode->reqstate, state, statelen);
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first_queued = reqnode;
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/* Send the request message if none pending. */
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if(!active)
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activate();
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return OK;
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}
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/*===========================================================================*
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* do_vfs_reply *
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*===========================================================================*/
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int do_vfs_reply(message *m)
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{
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/* VFS has handled a VM request and VFS has replied. It must be the
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* active request.
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*/
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struct vfs_request_node *orignode = active;
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vfs_callback_t req_callback;
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void *cbarg;
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int n;
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struct vmproc *vmp;
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assert(active);
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assert(active->req_id == m->VMV_REQID);
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/* the endpoint may have exited */
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if(vm_isokendpt(m->VMV_ENDPOINT, &n) != OK)
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vmp = NULL;
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else vmp = &vmproc[n];
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req_callback = active->callback;
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cbarg = active->opaque;
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active = NULL;
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/* Invoke requested reply-callback within VM. */
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if(req_callback) req_callback(vmp, m, cbarg, orignode->reqstate);
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SLABFREE(orignode);
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/* Send the next request message if any and not re-activated. */
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if(first_queued && !active)
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activate();
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return SUSPEND; /* don't reply to the reply */
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}
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