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authorPeng Tao <bergwolf@gmail.com>2012-01-12 23:18:48 +0800
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-01-12 16:39:05 -0500
commit74a6eeb44ca6174d9cc93b9b8b4d58211c57bc80 (patch)
tree7aa0fc19c383f31123232103121756e48fbb84ed /fs
parent93a3844ee0f843b05a1df4b52e1a19ff26b98d24 (diff)
downloadlinux-74a6eeb44ca6174d9cc93b9b8b4d58211c57bc80.tar.bz2
pnfsblock: limit bio page count
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. Cc: <stable@vger.kernel.org> #3.1+ Signed-off-by: Peng Tao <peng_tao@emc.com> Signed-off-by: Benny Halevy <bhalevy@tonian.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/blocklayout/blocklayout.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 6d39e9ab1e64..baf0bf2acbd4 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -146,14 +146,19 @@ static struct bio *bl_alloc_init_bio(int npg, sector_t isect,
{
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;
}