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[PATCH] hugetlb: fix absurd HugePages_Rsvd

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If you truncated an mmap'ed hugetlbfs file, then faulted on the truncated
area, /proc/meminfo's HugePages_Rsvd wrapped hugely "negative".  Reinstate my
preliminary i_size check before attempting to allocate the page (though this
only fixes the most obvious case: more work will be needed here).

Signed-off-by: Hugh Dickins <[email protected]>
Cc: Adam Litke <[email protected]>
Cc: David Gibson <[email protected]>
Cc: "Chen, Kenneth W" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Hugh Dickins
2006-10-28 11:30:53 -07:00
committed by Linus Torvalds
parent 856fc29505
commit ebed4bfc8d
1 changed files with 3 additions and 0 deletions
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mm/hugetlb.c
+3
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@@ -478,6 +478,9 @@ int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma,
retry: retry:
page = find_lock_page(mapping, idx); page = find_lock_page(mapping, idx);
if (!page) { if (!page) {
size = i_size_read(mapping->host) >> HPAGE_SHIFT;
if (idx >= size)
goto out;
if (hugetlb_get_quota(mapping)) if (hugetlb_get_quota(mapping))
goto out; goto out;
page = alloc_huge_page(vma, address); page = alloc_huge_page(vma, address);