diff options
| author | Jan Kara <jack@suse.cz> | 2016-12-15 00:07:24 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-15 01:04:09 +0100 |
| commit | b1aa812b21084285e9f6098639be9cd5bf9e05d7 (patch) | |
| tree | 4ae7e8f05e0d88f4a22bdd32b1b23722a779d4bc /mm | |
| parent | mm: factor out functionality to finish page faults (diff) | |
| download | linux-b1aa812b21084285e9f6098639be9cd5bf9e05d7.tar.xz linux-b1aa812b21084285e9f6098639be9cd5bf9e05d7.zip | |
mm: move handling of COW faults into DAX code
Move final handling of COW faults from generic code into DAX fault
handler. That way generic code doesn't have to be aware of
peculiarities of DAX locking so remove that knowledge and make locking
functions private to fs/dax.c.
Link: http://lkml.kernel.org/r/1479460644-25076-11-git-send-email-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memory.c | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/mm/memory.c b/mm/memory.c index 22f7f6e38515..ca3b95fa5fd1 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2845,7 +2845,7 @@ static int __do_fault(struct vm_fault *vmf) ret = vma->vm_ops->fault(vma, vmf); if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY | - VM_FAULT_DAX_LOCKED | VM_FAULT_DONE_COW))) + VM_FAULT_DONE_COW))) return ret; if (unlikely(PageHWPoison(vmf->page))) { @@ -3276,17 +3276,12 @@ static int do_cow_fault(struct vm_fault *vmf) if (ret & VM_FAULT_DONE_COW) return ret; - if (!(ret & VM_FAULT_DAX_LOCKED)) - copy_user_highpage(vmf->cow_page, vmf->page, vmf->address, vma); + copy_user_highpage(vmf->cow_page, vmf->page, vmf->address, vma); __SetPageUptodate(vmf->cow_page); ret |= finish_fault(vmf); - if (!(ret & VM_FAULT_DAX_LOCKED)) { - unlock_page(vmf->page); - put_page(vmf->page); - } else { - dax_unlock_mapping_entry(vma->vm_file->f_mapping, vmf->pgoff); - } + unlock_page(vmf->page); + put_page(vmf->page); if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY))) goto uncharge_out; return ret; |