The patch titled
Subject: mm/hugetlb: i_mmap_lock_write before unmapping in remove_inode_hugepages
has been added to the -mm tree. Its filename is
mm-hugetlb-unmap-pages-to-remove-if-page-fault-raced-with-hole-punch-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-hugetlb-unmap-pages-to-remove-if-page-fault-raced-with-hole-punch-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-hugetlb-unmap-pages-to-remove-if-page-fault-raced-with-hole-punch-fix.patch
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------------------------------------------------------
From: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Subject: mm/hugetlb: i_mmap_lock_write before unmapping in remove_inode_hugepages
Code was added to remove_inode_hugepages that will unmap a page if it is
mapped. i_mmap_lock_write() must be taken during the call to
hugetlb_vmdelete_list(). This is to prevent mappings(vmas) from being
added or deleted while the list of vmas is being examined.
Signed-off-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/hugetlbfs/inode.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN fs/hugetlbfs/inode.c~mm-hugetlb-unmap-pages-to-remove-if-page-fault-raced-with-hole-punch-fix fs/hugetlbfs/inode.c
--- a/fs/hugetlbfs/inode.c~mm-hugetlb-unmap-pages-to-remove-if-page-fault-raced-with-hole-punch-fix
+++ a/fs/hugetlbfs/inode.c
@@ -428,9 +428,11 @@ static void remove_inode_hugepages(struc
* until we finish removing the page.
*/
if (page_mapped(page)) {
+ i_mmap_lock_write(mapping);
hugetlb_vmdelete_list(&mapping->i_mmap,
next * pages_per_huge_page(h),
(next + 1) * pages_per_huge_page(h));
+ i_mmap_unlock_write(mapping);
}
lock_page(page);
_
Patches currently in -mm which might be from mike.kravetz@xxxxxxxxxx are
mm-hugetlb-define-hugetlb_falloc-structure-for-hole-punch-race.patch
mm-hugetlb-setup-hugetlb_falloc-during-fallocate-hole-punch.patch
mm-hugetlb-page-faults-check-for-fallocate-hole-punch-in-progress-and-wait.patch
mm-hugetlb-unmap-pages-to-remove-if-page-fault-raced-with-hole-punch.patch
mm-hugetlb-unmap-pages-to-remove-if-page-fault-raced-with-hole-punch-fix.patch
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