Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\memory.c Create Date:2022-07-28 14:43:09
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:do_cow_fault

Proto:static vm_fault_t do_cow_fault(struct vm_fault *vmf)

Type:vm_fault_t

Parameter:

TypeParameterName
struct vm_fault *vmf
3669  vma = Target VMA
3672  If Value for the false possibility is greater at compile time(anon_vma_prepare(vma)) Then Return VM_FAULT_OOM
3675  Page handler may use for COW fault = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, Faulting virtual address )
3676  If Not Page handler may use for COW fault Then Return VM_FAULT_OOM
3679  If mem_cgroup_try_charge_delay(Page handler may use for COW fault , The address space we belong to. , GFP_KERNEL, & Cgroup cow_page belongs to , false) Then
3681  put_page(Page handler may use for COW fault )
3682  Return VM_FAULT_OOM
3685  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().
3686  If Value for the false possibility is greater at compile time(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)) Then Go to uncharge_out
3688  If ret & VM_FAULT_DONE_COW Then Return ret
3691  copy_user_highpage(Page handler may use for COW fault , ->fault handlers should return a* page here, unless VM_FAULT_NOPAGE* is set (which is also implied by* VM_FAULT_ERROR)., Faulting virtual address , vma)
3692  __SetPageUptodate(Page handler may use for COW fault )
3694  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
3695  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.
3696  put_page(->fault handlers should return a* page here, unless VM_FAULT_NOPAGE* is set (which is also implied by* VM_FAULT_ERROR).)
3697  If Value for the false possibility is greater at compile time(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)) Then Go to uncharge_out
3699  Return ret
3700  uncharge_out :
3701  mem_cgroup_cancel_charge(Page handler may use for COW fault , Cgroup cow_page belongs to , false)
3702  put_page(Page handler may use for COW fault )
3703  Return ret
Caller
NameDescribe
do_faultWe enter with non-exclusive mmap_sem (to exclude vma changes,* but allow concurrent faults)