wp_pfn_shared

Name:Handle write page faults for VM_MIXEDMAP or VM_PFNMAP for a VM_SHARED* mapping

Proto:static vm_fault_t wp_pfn_shared(struct vm_fault *vmf)

Type:vm_fault_t

Parameter:

Type	Parameter	Name
struct vm_fault *	vmf

2646

vma = Target VMA

2648

If Function pointers to deal with this struct. && pfn_mkwrite Then

2651

pte_unmap_unlock(Pointer to pte entry matching* the 'address'. NULL if the page* table hasn't been allocated., Page table lock.* Protects pte page table if 'pte'* is not NULL, otherwise pmd.)

2652

FAULT_FLAG_xxx flags |= Fault was mkwrite of existing pte

2653

ret = pfn_mkwrite(vmf)

2654

If ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE) Then Return ret

2656

Return sh_mkwrite_fault - finish page fault for a shared mapping, making PTE* writeable once the page is prepared*@vmf: structure describing the fault* This function handles all that is needed to finish a write page fault in a

2658

Handle write page faults for pages that can be reused in the current vma* This can happen either due to the mapping being with the VM_SHARED flag,* or due to us being the last reference standing to the page

2659

Return VM_FAULT_WRITE

**Caller**
Name	Describe
do_wp_page	This routine handles present pages, when users try to write* to a shared page. It is done by copying the page to a new address* and decrementing the shared-page counter for the old page.* Note that this routine assumes that the protection checks have been

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