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FS-Cache: Recruit a page flags for cache management

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Recruit a page flag to aid in cache management.  The following extra flag is
defined:

 (1) PG_fscache (PG_private_2)

     The marked page is backed by a local cache and is pinning resources in the
     cache driver.

If PG_fscache is set, then things that checked for PG_private will now also
check for that.  This includes things like truncation and page invalidation.
The function page_has_private() had been added to make the checks for both
PG_private and PG_private_2 at the same time.

Signed-off-by: David Howells <[email protected]>
Acked-by: Steve Dickson <[email protected]>
Acked-by: Trond Myklebust <[email protected]>
Acked-by: Rik van Riel <[email protected]>
Acked-by: Al Viro <[email protected]>
Tested-by: Daire Byrne <[email protected]>
This commit is contained in:
David Howells 2009-04-03 16:42:36 +01:00
commit 266cf658ef
8 changed files with 58 additions and 25 deletions
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3
mm/filemap.c
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@ -2463,6 +2463,9 @@ EXPORT_SYMBOL(generic_file_aio_write);
* (presumably at page->private). If the release was successful, return `1'.
* Otherwise return zero.
*
* This may also be called if PG_fscache is set on a page, indicating that the
* page is known to the local caching routines.
*
* The @gfp_mask argument specifies whether I/O may be performed to release
* this page (__GFP_IO), and whether the call may block (__GFP_WAIT & __GFP_FS).
*