4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Zhao Lei <zhaolei@xxxxxxxxxxxxxx>
commit e1746e8381cd2af421f75557b5cae3604fc18b35 upstream.
I see no_space in v4.4-rc1 again in xfstests generic/102.
It happened randomly in some node only.
(one of 4 phy-node, and a kvm with non-virtio block driver)
By bisect, we can found the first-bad is:
commit bdced438acd8 ("block: setup bi_phys_segments after splitting")'
But above patch only triggered the bug by making bio operation
faster(or slower).
Main reason is in our space_allocating code, we need to commit
page writeback before wait it complish, this patch fixed above
bug.
BTW, there is another reason for generic/102 fail, caused by
disable default mixed-blockgroup, I'll fix it in xfstests.
Signed-off-by: Zhao Lei <zhaolei@xxxxxxxxxxxxxx>
Signed-off-by: Chris Mason <clm@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/extent-tree.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4086,8 +4086,10 @@ commit_trans:
!atomic_read(&root->fs_info->open_ioctl_trans)) {
need_commit--;
- if (need_commit > 0)
+ if (need_commit > 0) {
+ btrfs_start_delalloc_roots(fs_info, 0, -1);
btrfs_wait_ordered_roots(fs_info, -1);
+ }
trans = btrfs_join_transaction(root);
if (IS_ERR(trans))
--
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