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dax: update to new mmu_notifier semantic

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Replace all mmu_notifier_invalidate_page() calls by *_invalidate_range()
and make sure it is bracketed by calls to *_invalidate_range_start()/end().

Note that because we can not presume the pmd value or pte value we have
to assume the worst and unconditionaly report an invalidation as
happening.

Signed-off-by: Jérôme Glisse <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Ross Zwisler <[email protected]>
Cc: Bernhard Held <[email protected]>
Cc: Adam Borowski <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Radim Krčmář <[email protected]>
Cc: Wanpeng Li <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Takashi Iwai <[email protected]>
Cc: Nadav Amit <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: axie <[email protected]>
Cc: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jérôme Glisse 2017-08-31 17:17:26 -04:00 • committed by Linus Torvalds
commit a4d1a88525
3 changed files with 33 additions and 13 deletions
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19
fs/dax.c
View file

@ -646,11 +646,10 @@ static void dax_mapping_entry_mkclean(struct address_space *mapping,
pte_t pte, *ptep = NULL;
pmd_t *pmdp = NULL;
spinlock_t *ptl;
bool changed;
i_mmap_lock_read(mapping);
vma_interval_tree_foreach(vma, &mapping->i_mmap, index, index) {
unsigned long address;
unsigned long address, start, end;
cond_resched();
@ -658,8 +657,13 @@ static void dax_mapping_entry_mkclean(struct address_space *mapping,
continue;
address = pgoff_address(index, vma);
changed = false;
if (follow_pte_pmd(vma->vm_mm, address, &ptep, &pmdp, &ptl))
/*
* Note because we provide start/end to follow_pte_pmd it will
* call mmu_notifier_invalidate_range_start() on our behalf
* before taking any lock.
*/
if (follow_pte_pmd(vma->vm_mm, address, &start, &end, &ptep, &pmdp, &ptl))
continue;
if (pmdp) {
@ -676,7 +680,7 @@ static void dax_mapping_entry_mkclean(struct address_space *mapping,
pmd = pmd_wrprotect(pmd);
pmd = pmd_mkclean(pmd);
set_pmd_at(vma->vm_mm, address, pmdp, pmd);
changed = true;
mmu_notifier_invalidate_range(vma->vm_mm, start, end);
unlock_pmd:
spin_unlock(ptl);
#endif
@ -691,13 +695,12 @@ unlock_pmd:
pte = pte_wrprotect(pte);
pte = pte_mkclean(pte);
set_pte_at(vma->vm_mm, address, ptep, pte);
changed = true;
mmu_notifier_invalidate_range(vma->vm_mm, start, end);
unlock_pte:
pte_unmap_unlock(ptep, ptl);
}
if (changed)
mmu_notifier_invalidate_page(vma->vm_mm, address);
mmu_notifier_invalidate_range_end(vma->vm_mm, start, end);
}
i_mmap_unlock_read(mapping);
}