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TAKE 959485 - xfs_start_page_writeback should use clear_page_dirty_for_i

To: xfs@xxxxxxxxxxx, sgi.bugs.xfs@xxxxxxxxxxxx
Subject: TAKE 959485 - xfs_start_page_writeback should use clear_page_dirty_for_io
From: dgc@xxxxxxx (David Chinner)
Date: Fri, 22 Dec 2006 11:45:32 +1100 (EST)
Sender: xfs-bounce@xxxxxxxxxxx
Fix XFS after clear_page_dirty() removal

XFS appears to call clear_page_dirty to get the mapping tree dirty tag
set correctly at the same time the page dirty flag is cleared.  I note
that this can be done by set_page_writeback() if we clear the dirty flag
on the page first when we are writing back the entire page.

Hence it seems to me that the XFS call to clear_page_dirty() could
easily be substituted by clear_page_dirty_for_io() followed by a call to
set_page_writeback() to get the mapping tree tags set correctly after
the page has been marked clean.

Date:  Fri Dec 22 11:44:24 AEDT 2006
Workarea:  chook.melbourne.sgi.com:/build/dgc/isms/2.6.x-xfs
Inspected by:  torvalds@xxxxxxxx

The following file(s) were checked into:

Modid:  xfs-linux-melb:xfs-kern:27807a
fs/xfs/linux-2.6/xfs_aops.c - 1.138 - changed
        - clear_page_dirty() has been removed from the tree, so use
          clear_page_dirty_for_io() instead and call set_page_writeback()
          after modifying the page dirty state to update the mapping tree
          tags correctly for writeback.

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