From 74a6eeb44ca6174d9cc93b9b8b4d58211c57bc80 Mon Sep 17 00:00:00 2001 From: Peng Tao Date: Thu, 12 Jan 2012 23:18:48 +0800 Subject: [PATCH] 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: #3.1+ Signed-off-by: Peng Tao Signed-off-by: Benny Halevy Signed-off-by: Trond Myklebust --- fs/nfs/blocklayout/blocklayout.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c index 6d39e9ab1e6..baf0bf2acbd 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; } -- 2.39.5