[079/129] pnfsblock: limit bio page count

[Greg KH]

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------
Content-Length: 1277
Lines: 45

From: Peng Tao <bergwolf@xxxxxxxxx>

commit 74a6eeb44ca6174d9cc93b9b8b4d58211c57bc80 upstream.

One bio can have at most BIO_MAX_PAGES pages. We should limit it bec otherwise
bio_alloc will fail when there are many pages in one read/write_pagelist.

Signed-off-by: Peng Tao <peng_tao@xxxxxxx>
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxx>
Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 fs/nfs/blocklayout/blocklayout.c |   17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -146,14 +146,19 @@ static struct bio *bl_alloc_init_bio(int
 {
 	struct bio *bio;
 
+	npg = min(npg, BIO_MAX_PAGES);
 	bio = bio_alloc(GFP_NOIO, npg);
-	if (!bio)
-		return NULL;
+	if (!bio && (current->flags & PF_MEMALLOC)) {
+		while (!bio && (npg /= 2))
+			bio = bio_alloc(GFP_NOIO, npg);
+	}
 
-	bio->bi_sector = isect - be->be_f_offset + be->be_v_offset;
-	bio->bi_bdev = be->be_mdev;
-	bio->bi_end_io = end_io;
-	bio->bi_private = par;
+	if (bio) {
+		bio->bi_sector = isect - be->be_f_offset + be->be_v_offset;
+		bio->bi_bdev = be->be_mdev;
+		bio->bi_end_io = end_io;
+		bio->bi_private = par;
+	}
 	return bio;
 }
 


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