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Revert "writeback: do not sync data dirtied after sync start"

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This reverts commit c4a391b53a. Dave
Chinner <david@fromorbit.com> has reported the commit may cause some
inodes to be left out from sync(2). This is because we can call
redirty_tail() for some inode (which sets i_dirtied_when to current time)
after sync(2) has started or similarly requeue_inode() can set
i_dirtied_when to current time if writeback had to skip some pages. The
real problem is in the functions clobbering i_dirtied_when but fixing
that isn't trivial so revert is a safer choice for now.

CC: stable@vger.kernel.org # >= 3.13
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara
2014-02-21 11:19:04 +01:00
parent 1362f4ea20
commit 0dc83bd30b
5 changed files with 22 additions and 36 deletions
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include/trace/events/writeback.h
+3 -3
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@@ -287,11 +287,11 @@ TRACE_EVENT(writeback_queue_io,
__field(int, reason)
),
TP_fast_assign(
unsigned long older_than_this = work->older_than_this;
unsigned long *older_than_this = work->older_than_this;
strncpy(__entry->name, dev_name(wb->bdi->dev), 32);
__entry->older = older_than_this;
__entry->older = older_than_this ? *older_than_this : 0;
__entry->age = older_than_this ?
(jiffies - older_than_this) * 1000 / HZ : -1;
(jiffies - *older_than_this) * 1000 / HZ : -1;
__entry->moved = moved;
__entry->reason = work->reason;
),