int mappedfile_copy(struct vir_region *vr, struct vir_region *newvr)
{
assert(vr->param.file.inited);
mappedfile_setfile(newvr->parent, newvr, vr->param.file.fdref->fd,
vr->param.file.offset,
vr->param.file.fdref->dev, vr->param.file.fdref->ino,
vr->param.file.clearend, 0, 0);
assert(newvr->param.file.inited);
return OK;
}
static int mmap_file(struct vmproc *vmp,
int vmfd, off_t file_offset, int flags,
ino_t ino, dev_t dev, u64_t filesize, vir_bytes addr, vir_bytes len,
vir_bytes *retaddr, u16_t clearend, int writable, int mayclosefd)
{
/* VFS has replied to a VMVFSREQ_FDLOOKUP request. */
struct vir_region *vr;
u64_t page_offset;
int result = OK;
u32_t vrflags = 0;
if(writable) vrflags |= VR_WRITABLE;
/* Do some page alignments. */
if((page_offset = (file_offset % VM_PAGE_SIZE))) {
file_offset -= page_offset;
len += page_offset;
}
len = roundup(len, VM_PAGE_SIZE);
/* All numbers should be page-aligned now. */
assert(!(len % VM_PAGE_SIZE));
assert(!(filesize % VM_PAGE_SIZE));
assert(!(file_offset % VM_PAGE_SIZE));
#if 0
/* XXX ld.so relies on longer-than-file mapping */
if((u64_t) len + file_offset > filesize) {
printf("VM: truncating mmap dev 0x%x ino %d beyond file size in %d; offset %llu, len %lu, size %llu; ",
dev, ino, vmp->vm_endpoint,
file_offset, len, filesize);
len = filesize - file_offset;
return EINVAL;
}
#endif
if(!(vr = mmap_region(vmp, addr, flags, len,
vrflags, &mem_type_mappedfile, 0))) {
result = ENOMEM;
} else {
*retaddr = vr->vaddr + page_offset;
result = OK;
mappedfile_setfile(vmp, vr, vmfd,
file_offset, dev, ino, clearend, 1, mayclosefd);
}
return result;
}