[Devel] [PATCH RHEL7 COMMIT] ve/fs/writeback: use redirty_tail to skip inodes

[Konstantin Khorenko]

The commit is pushed to "branch-rh7-3.10.0-229.7.2.vz7.9.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-229.7.2.vz7.9.27
------>
commit c298ffa25b3f84257e6e122bfa8d2cf9ed1a6fff
Author: Andrey Ryabinin <aryabinin at virtuozzo.com>
Date:   Mon Jan 25 16:26:08 2016 +0400

    ve/fs/writeback: use redirty_tail to skip inodes
    
    We call requeue_io() on inode that meant to be skipped. It's not right
    since requeue_io() means that we will busy retry to write that inode.
    redirty_tail() should be used to skip inodes.
    
    https://jira.sw.ru/browse/PSBM-43375
    
    Signed-off-by: Andrey Ryabinin <aryabinin at virtuozzo.com>
    Acked-by: Dmitry Monakhov <dmonakhov at virtuozzo.com>
---
 fs/fs-writeback.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 7b83367..d48530f9 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -729,7 +729,7 @@ static long writeback_sb_inodes(struct super_block *sb,
 		if ((work->ub || work->filter_ub) &&
 		     ub_should_skip_writeback(work->ub, inode)) {
 			spin_unlock(&inode->i_lock);
-			requeue_io(inode, wb);
+			redirty_tail(inode, wb);
 			continue;
 		}