diff options
| author | Hugh Dickins <hugh@veritas.com> | 2006-02-12 19:26:05 +0000 |
|---|---|---|
| committer | Chris Wright <chrisw@sous-sol.org> | 2006-03-01 14:36:32 -0800 |
| commit | 32065dc4c027c69cc03431155db36ea27f9f98f5 (patch) | |
| tree | 28c26cb67e150fa03f9c97e9b9865f9727d7a5c9 | |
| parent | bcf2887b1416a506e3461c504642a1b7fad52ddc (diff) | |
[PATCH] hugetlbfs mmap ENOMEM failure
2.6.15's hugepage faulting introduced huge_pages_needed accounting into
hugetlbfs: to count how many pages are already in cache, for spot check
on how far a new mapping may be allowed to extend the file. But it's
muddled: each hugepage found covers HPAGE_SIZE, not PAGE_SIZE. Once
pages were already in cache, it would overshoot, wrap its hugepages
count backwards, and so fail a harmless repeat mapping with -ENOMEM.
Fixes the problem found by Don Dupuis.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Acked-By: Adam Litke <agl@us.ibm.com>
Acked-by: William Irwin <wli@us.ibm.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | fs/hugetlbfs/inode.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index 8c1cef3bb677..c95ae294b810 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -71,8 +71,8 @@ huge_pages_needed(struct address_space *mapping, struct vm_area_struct *vma) unsigned long start = vma->vm_start; unsigned long end = vma->vm_end; unsigned long hugepages = (end - start) >> HPAGE_SHIFT; - pgoff_t next = vma->vm_pgoff; - pgoff_t endpg = next + ((end - start) >> PAGE_SHIFT); + pgoff_t next = vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT); + pgoff_t endpg = next + hugepages; pagevec_init(&pvec, 0); while (next < endpg) { |