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relay: nopage 

Convert relay from nopage to fault.
Remove redundant vma range checks.
Switch from OOM to SIGBUS if the resource is not available.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Tom Zanussi <zanussi@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Piggin 2008-02-06 01:37:34 -08:00 committed by Linus Torvalds
parent f2df3f65d0
commit a1e096129b
1 changed files with 9 additions and 15 deletions
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24
kernel/relay.c
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@ -37,37 +37,31 @@ static void relay_file_mmap_close(struct vm_area_struct *vma)
}
/*
* nopage() vm_op implementation for relay file mapping.
* fault() vm_op implementation for relay file mapping.
*/
static struct page *relay_buf_nopage(struct vm_area_struct *vma,
unsigned long address,
int *type)
static int relay_buf_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct page *page;
struct rchan_buf *buf = vma->vm_private_data;
unsigned long offset = address - vma->vm_start;
pgoff_t pgoff = vmf->pgoff;
if (address > vma->vm_end)
return NOPAGE_SIGBUS; /* Disallow mremap */
if (!buf)
return NOPAGE_OOM;
return VM_FAULT_OOM;
page = vmalloc_to_page(buf->start + offset);
page = vmalloc_to_page(buf->start + (pgoff << PAGE_SHIFT));
if (!page)
return NOPAGE_OOM;
return VM_FAULT_SIGBUS;
get_page(page);
vmf->page = page;
if (type)
*type = VM_FAULT_MINOR;
return page;
return 0;
}
/*
* vm_ops for relay file mappings.
*/
static struct vm_operations_struct relay_file_mmap_ops = {
.nopage = relay_buf_nopage,
.fault = relay_buf_fault,
.close = relay_file_mmap_close,
};