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>
---
fs/hugetlbfs/inode.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index f25b72f..0f3999d 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -428,9 +428,11 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart,
* 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);
--
2.4.3
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