From 048883e0b934d9a5103d40e209cb14b7f33d2933 Mon Sep 17 00:00:00 2001
From: Peng Tao <tao.peng@primarydata.com>
Date: Fri, 11 Sep 2015 11:14:06 +0800
Subject: [PATCH] nfs: fix pg_test page count calculation
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@lst.de>
Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Fixes: 2e11f8296d22 ("nfs: cap request size to fit a kmalloced page array")
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
---
fs/nfs/pagelist.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 7c5718ba625e..fe3ddd20ff89 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -508,7 +508,7 @@ size_t nfs_generic_pg_test(struct nfs_pageio_descriptor *desc,
* 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);