do_read_fault

Name:do_read_fault

Proto:static vm_fault_t do_read_fault(struct vm_fault *vmf)

Type:vm_fault_t

Parameter:

Type	Parameter	Name
struct vm_fault *	vmf

3642

vma = Target VMA

3643

ret = 0

3650

If map_pages && fault_around_bytes >> PAGE_SHIFT determines the page size > 1 Then

3651

ret = do_fault_around() tries to map few pages around the fault address. The hope* is that the pages will be needed soon and this will lower the number of* faults to handle.* It uses vm_ops->map_pages() to map the pages, which skips the page if it's

3652

If ret Then Return ret

3656

ret = The mmap_sem must have been held on entry, and may have been* released depending on flags and vma->vm_ops->fault() return value.* See filemap_fault() and __lock_page_retry().

3657

If Value for the false possibility is greater at compile time(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)) Then Return ret

3660

ret |= sh_fault - finish page fault once we have prepared the page to fault*@vmf: structure describing the fault* This function handles all that is needed to finish a page fault once the* page to fault in is prepared

3661

lock_page - unlock a locked page*@page: the page* Unlocks the page and wakes up sleepers in ___wait_on_page_locked().* Also wakes sleepers in wait_on_page_writeback() because the wakeup* mechanism between PageLocked pages and PageWriteback pages is shared.

3662

If Value for the false possibility is greater at compile time(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)) Then put_page(->fault handlers should return a* page here, unless VM_FAULT_NOPAGE* is set (which is also implied by* VM_FAULT_ERROR).)

3664

Return ret

**Caller**
Name	Describe
do_fault	We enter with non-exclusive mmap_sem (to exclude vma changes,* but allow concurrent faults)

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