The patch titled
Subject: writeback-safer-lock-nesting-v4
has been added to the -mm tree. Its filename is
writeback-safer-lock-nesting-v4.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/writeback-safer-lock-nesting-v4.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/writeback-safer-lock-nesting-v4.patch
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The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Greg Thelen <gthelen@xxxxxxxxxx>
Subject: writeback-safer-lock-nesting-v4
Link: http://lkml.kernel.org/r/20180411084653.254724-1-gthelen@xxxxxxxxxx
Fixes: 682aa8e1a6a1 ("writeback: implement unlocked_inode_to_wb transaction and use it for stat updates")
Cc: stable@xxxxxxxxxxxxxxx # v4.2+
Reported-by: Wang Long <wanglong19@xxxxxxxxxxx>
Signed-off-by: Greg Thelen <gthelen@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Acked-by: Wang Long <wanglong19@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/fs-writeback.c | 2 +-
include/linux/backing-dev.h | 1 -
2 files changed, 1 insertion(+), 2 deletions(-)
diff -puN fs/fs-writeback.c~writeback-safer-lock-nesting-v4 fs/fs-writeback.c
--- a/fs/fs-writeback.c~writeback-safer-lock-nesting-v4
+++ a/fs/fs-writeback.c
@@ -745,7 +745,7 @@ int inode_congested(struct inode *inode,
*/
if (inode && inode_to_wb_is_valid(inode)) {
struct bdi_writeback *wb;
- struct wb_lock_cookie lock_cookie;
+ struct wb_lock_cookie lock_cookie = {};
bool congested;
wb = unlocked_inode_to_wb_begin(inode, &lock_cookie);
diff -puN include/linux/backing-dev.h~writeback-safer-lock-nesting-v4 include/linux/backing-dev.h
--- a/include/linux/backing-dev.h~writeback-safer-lock-nesting-v4
+++ a/include/linux/backing-dev.h
@@ -372,7 +372,6 @@ unlocked_inode_to_wb_begin(struct inode
if (unlikely(cookie->locked))
xa_lock_irqsave(&inode->i_mapping->i_pages, cookie->flags);
-
/*
* Protected by either !I_WB_SWITCH + rcu_read_lock() or the i_pages
* lock. inode_to_wb() will bark. Deref directly.
_
Patches currently in -mm which might be from gthelen@xxxxxxxxxx are
writeback-safer-lock-nesting.patch
writeback-safer-lock-nesting-v4.patch
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