This is a note to let you know that I've just added the patch titled
nfs: fix pg_test page count calculation
to the 4.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfs-fix-pg_test-page-count-calculation.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 048883e0b934d9a5103d40e209cb14b7f33d2933 Mon Sep 17 00:00:00 2001
From: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
Date: Fri, 11 Sep 2015 11:14:06 +0800
Subject: nfs: fix pg_test page count calculation
From: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
commit 048883e0b934d9a5103d40e209cb14b7f33d2933 upstream.
We really want sizeof(struct page *) instead. Otherwise we limit
maximum IO size to 64 pages rather than 512 pages on a 64bit system.
Fixes 2e11f829(nfs: cap request size to fit a kmalloced page array).
Cc: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
Fixes: 2e11f8296d22 ("nfs: cap request size to fit a kmalloced page array")
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/nfs/pagelist.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -508,7 +508,7 @@ size_t nfs_generic_pg_test(struct nfs_pa
* for it without upsetting the slab allocator.
*/
if (((mirror->pg_count + req->wb_bytes) >> PAGE_SHIFT) *
- sizeof(struct page) > PAGE_SIZE)
+ sizeof(struct page *) > PAGE_SIZE)
return 0;
return min(mirror->pg_bsize - mirror->pg_count, (size_t)req->wb_bytes);
Patches currently in stable-queue which might be from tao.peng@xxxxxxxxxxxxxxx are
queue-4.2/nfs-fix-pg_test-page-count-calculation.patch
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