[Bug 71791] Unlinking a file that was moved to another folder but still open by other process blocks either process (not always reproducible)

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https://bugzilla.kernel.org/show_bug.cgi?id=71791

Zheng Liu <gnehzuil.liu@xxxxxxxxx> changed:

           What    |Removed                     |Added
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                 CC|                            |gnehzuil.liu@xxxxxxxxx

--- Comment #2 from Zheng Liu <gnehzuil.liu@xxxxxxxxx> ---
I guess that the journal mode is 'data=ordered', right?  Could you please try
to switch the journal mode to 'data=writeback' and look at whether or not the
problem can be reproduced?

In our product system, we met a hang which is caused by 'data=ordered' under a
heavy IO workload.  When the user uses 'rm' command to delete a file,
ext4_begin_ordered_truncate() should be called with 'data=ordered' and it could
trigger write back kernel thread to write out the dirty data.  Then
truncate_inode_pages() will wait on write back.

Regards,
                                                - Zheng

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