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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: 2e11f8296d ("nfs: cap request size to fit a kmalloced page array")
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Peng Tao 2015-09-11 11:14:06 +08:00 committed by Trond Myklebust
parent a41cbe86df
commit 048883e0b9
1 changed files with 1 additions and 1 deletions
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2
fs/nfs/pagelist.c
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@ -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);