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[PATCH] add AOP_TRUNCATED_PAGE, prepend AOP_ to WRITEPAGE_ACTIVATE

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readpage(), prepare_write(), and commit_write() callers are updated to
understand the special return code AOP_TRUNCATED_PAGE in the style of
writepage() and WRITEPAGE_ACTIVATE.  AOP_TRUNCATED_PAGE tells the caller that
the callee has unlocked the page and that the operation should be tried again
with a new page.  OCFS2 uses this to detect and work around a lock inversion in
its aop methods.  There should be no change in behaviour for methods that don't
return AOP_TRUNCATED_PAGE.

WRITEPAGE_ACTIVATE is also prepended with AOP_ for consistency and they are
made enums so that kerneldoc can be used to document their semantics.

Signed-off-by: Zach Brown <[email protected]>
This commit is contained in:
Zach Brown 2005-12-15 14:28:17 -08:00 • committed by Joel Becker
commit 994fc28c7b
9 changed files with 113 additions and 45 deletions
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mm/shmem.c
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@ -855,7 +855,7 @@ unlock:
swap_free(swap);
redirty:
set_page_dirty(page);
return WRITEPAGE_ACTIVATE; /* Return with the page locked */
return AOP_WRITEPAGE_ACTIVATE; /* Return with the page locked */
}
#ifdef CONFIG_NUMA