From: Peng Tao <tao.peng@primarydata.com>
To: linux-nfs@vger.kernel.org
Cc: Trond Myklebust <trond.myklebust@primarydata.com>,
Peng Tao <tao.peng@primarydata.com>,
Christoph Hellwig <hch@lst.de>
Subject: [PATCH] nfs: fix pg_test page count calculation
Date: Fri, 11 Sep 2015 11:14:06 +0800 [thread overview]
Message-ID: <1441941246-52981-1-git-send-email-tao.peng@primarydata.com> (raw)
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>
---
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 7c5718b..fe3ddd2 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);
--
1.8.3.1
reply other threads:[~2015-09-11 3:14 UTC|newest]
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