xfs: mmap lock needs to be inside freeze protection

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Lock ordering for the new mmap lock needs to be:

mmap_sem
  sb_start_pagefault
    i_mmap_lock
      page lock
        <fault processsing>

Right now xfs_vm_page_mkwrite gets this the wrong way around,
While technically it cannot deadlock due to the current freeze
ordering, it's still a landmine that might explode if we change
anything in future. Hence we need to nest the locks correctly.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

...

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Dave Chinner 2015-06-04 09:18:18 +10:00 • committed by Dave Chinner

parent 5ebe6afaf0

commit ec56b1f1fd

1 changed files with 8 additions and 3 deletions

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fs/xfs/xfs_file.c

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