If cluster scale exceeds 16 nodes, bio will be full and bio_add_page()
returns 0 when adding pages to bio. Returning -EIO to o2hb_read_slots()
from o2hb_setup_one_bio() will lead to losing chance to allocate more
bios to present all heartbeat region.
So o2hb_read_slots() fails.
In my test, making fs fails in starting o2cb service.
Attach error log:
(mkfs.ocfs2,27479,2):o2hb_setup_one_bio:463 page 0, vec_len = 4096, vec_start = 0
(mkfs.ocfs2,27479,2):o2hb_setup_one_bio:463 page 1, vec_len = 4096, vec_start = 0
(mkfs.ocfs2,27479,2):o2hb_setup_one_bio:463 page 2, vec_len = 4096, vec_start = 0
(mkfs.ocfs2,27479,2):o2hb_setup_one_bio:463 page 3, vec_len = 4096, vec_start = 0
(mkfs.ocfs2,27479,2):o2hb_setup_one_bio:463 page 4, vec_len = 4096, vec_start = 0
(mkfs.ocfs2,27479,2):o2hb_setup_one_bio:463 page 5, vec_len = 4096, vec_start = 0
(mkfs.ocfs2,27479,2):o2hb_setup_one_bio:463 page 6, vec_len = 4096, vec_start = 0
(mkfs.ocfs2,27479,2):o2hb_setup_one_bio:463 page 7, vec_len = 4096, vec_start = 0
(mkfs.ocfs2,27479,2):o2hb_setup_one_bio:463 page 8, vec_len = 4096, vec_start = 0
(mkfs.ocfs2,27479,2):o2hb_setup_one_bio:463 page 9, vec_len = 4096, vec_start = 0
(mkfs.ocfs2,27479,2):o2hb_setup_one_bio:463 page 10, vec_len = 4096, vec_start
= 0
(mkfs.ocfs2,27479,2):o2hb_setup_one_bio:463 page 11, vec_len = 4096, vec_start
= 0
(mkfs.ocfs2,27479,2):o2hb_setup_one_bio:463 page 12, vec_len = 4096, vec_start
= 0
(mkfs.ocfs2,27479,2):o2hb_setup_one_bio:463 page 13, vec_len = 4096, vec_start
= 0
(mkfs.ocfs2,27479,2):o2hb_setup_one_bio:463 page 14, vec_len = 4096, vec_start
= 0
(mkfs.ocfs2,27479,2):o2hb_setup_one_bio:463 page 15, vec_len = 4096, vec_start
= 0
(mkfs.ocfs2,27479,2):o2hb_setup_one_bio:463 page 16, vec_len = 4096, vec_start
= 0
(mkfs.ocfs2,27479,2):o2hb_setup_one_bio:471 ERROR: Adding page[16] to bio
failed, page ffffea0002d7ed40, len 0, vec_len 4096, vec_start 0, bi_sector 8192
(mkfs.ocfs2,27479,2):o2hb_read_slots:500 ERROR: status = -5
(mkfs.ocfs2,27479,2):o2hb_populate_slot_data:1911 ERROR: status = -5
(mkfs.ocfs2,27479,2):o2hb_region_dev_write:2012 ERROR: status = -5
Fixes: ba16ddfbeb9d ("ocfs2/o2hb: check len for bio_add_page() to avoid getting
incorrect bio"
Signed-off-by: Changwei Ge <ge.chang...@h3c.com>
---
fs/ocfs2/cluster/heartbeat.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index 91a8889abf9b..2809e29d612d 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -540,11 +540,12 @@ static struct bio *o2hb_setup_one_bio(struct o2hb_region
*reg,
struct bio *bio;
struct page *page;
+#define O2HB_BIO_VECS 16
/* Testing has shown this allocation to take long enough under
* GFP_KERNEL that the local node can get fenced. It would be
* nicest if we could pre-allocate these bios and avoid this
* all together. */
- bio = bio_alloc(GFP_ATOMIC, 16);
+ bio = bio_alloc(GFP_ATOMIC, O2HB_BIO_VECS);
if (!bio) {
mlog(ML_ERROR, "Could not alloc slots BIO!\n");
bio = ERR_PTR(-ENOMEM);
@@ -570,7 +571,10 @@ static struct bio *o2hb_setup_one_bio(struct o2hb_region
*reg,
current_page, vec_len, vec_start);
len = bio_add_page(bio, page, vec_len, vec_start);
- if (len != vec_len) {
+ if (len == 0 && current_page == O2HB_BIO_VECS) {
+ /* bio is full now. */
+ goto bail;
+ } else if (len != vec_len) {
mlog(ML_ERROR, "Adding page[%d] to bio failed, "
"page %p, len %d, vec_len %u, vec_start %u, "
"bi_sector %llu\n", current_page, page, len,
--
2.7.4
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