• Konstantin Khlebnikov's avatar
    mm: kill vma flag VM_INSERTPAGE · 4b6e1e37
    Konstantin Khlebnikov authored
    Merge VM_INSERTPAGE into VM_MIXEDMAP.  VM_MIXEDMAP VMA can mix pure-pfn
    ptes, special ptes and normal ptes.
    
    Now copy_page_range() always copies VM_MIXEDMAP VMA on fork like
    VM_PFNMAP.  If driver populates whole VMA at mmap() it probably not
    expects page-faults.
    
    This patch removes special check from vma_wants_writenotify() which
    disables pages write tracking for VMA populated via vm_instert_page().
    BDI below mapped file should not use dirty-accounting, moreover
    do_wp_page() can handle this.
    
    vm_insert_page() still marks vma after first usage.  Usually it is called
    from f_op->mmap() handler under mm->mmap_sem write-lock, so it able to
    change vma->vm_flags.  Caller must set VM_MIXEDMAP at mmap time if it
    wants to call this function from other places, for example from page-fault
    handler.
    Signed-off-by: default avatarKonstantin Khlebnikov <khlebnikov@openvz.org>
    Cc: Alexander Viro <viro@zeniv.linux.org.uk>
    Cc: Carsten Otte <cotte@de.ibm.com>
    Cc: Chris Metcalf <cmetcalf@tilera.com>
    Cc: Cyrill Gorcunov <gorcunov@openvz.org>
    Cc: Eric Paris <eparis@redhat.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Hugh Dickins <hughd@google.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: James Morris <james.l.morris@oracle.com>
    Cc: Jason Baron <jbaron@redhat.com>
    Cc: Kentaro Takeda <takedakn@nttdata.co.jp>
    Cc: Matt Helsley <matthltc@us.ibm.com>
    Cc: Nick Piggin <npiggin@kernel.dk>
    Cc: Oleg Nesterov <oleg@redhat.com>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Robert Richter <robert.richter@amd.com>
    Cc: Suresh Siddha <suresh.b.siddha@intel.com>
    Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
    Cc: Venkatesh Pallipadi <venki@google.com>
    Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    4b6e1e37
mmap.c 70.5 KB