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Update mmap related error to be a bit more useful for debug

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Godzil 2019-07-24 15:59:34 +01:00
parent 70f58ed6dc
commit 095ac4569a
1 changed files with 7 additions and 4 deletions
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11
kfusd/kfusd.c
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@ -1736,8 +1736,11 @@ static int fusd_client_fault(struct vm_area_struct *vma, struct vm_fault *vmf, i
#endif #endif
// todo: worry about size // todo: worry about size
if (offset > mmap_instance->size) if (offset > mmap_instance->size) {
RDEBUG(2,
"Current offset bigger than block size: cannot accept");
goto out; goto out;
}
down_read(&mmap_instance->fusd_dev->task->mm->mmap_sem); down_read(&mmap_instance->fusd_dev->task->mm->mmap_sem);
result = GET_USER_PAGES(mmap_instance->fusd_dev->task, mmap_instance->fusd_dev->task->mm, result = GET_USER_PAGES(mmap_instance->fusd_dev->task, mmap_instance->fusd_dev->task->mm,
@ -1745,9 +1748,9 @@ static int fusd_client_fault(struct vm_area_struct *vma, struct vm_fault *vmf, i
up_read(&mmap_instance->fusd_dev->task->mm->mmap_sem); up_read(&mmap_instance->fusd_dev->task->mm->mmap_sem);
if (PageAnon(vmf->page)) { if (PageAnon(page)) {
RDEBUG(2, RDEBUG(2, "Cannot mmap non anonymous pages: The server is sharing a private page.\n"
"Cannot mmap anonymous pages. Be sure to allocate your shared buffer with MAP_SHARED | MAP_ANONYMOUS"); "Be sure to allocate your shared buffer with mmap and MAP_SHARED | MAP_ANONYMOUS as flags.");
return VM_FAULT_SIGBUS; return VM_FAULT_SIGBUS;
} }