On Thu, 19 Apr 2007, Badari Pulavarty wrote:
> On Thu, 2007-04-19 at 09:35 -0700, Christoph Lameter wrote:
> > Variable Order Page Cache Patchset
> >
>
> ..
> mm/built-in.o: In function `__generic_file_aio_write_nolock':
> filemap.c:(.text+0x295c): undefined reference to `page_cache_shift'
> filemap.c:(.text+0x296c): undefined reference to `page_cache_shift'
> fs/built-in.o: In function `simple_commit_write':
> (.text+0x20866): undefined reference to `page_cache_shift'
> fs/built-in.o: In function `simple_prepare_write':
> (.text+0x2097b): undefined reference to `page_cache_size'
> fs/built-in.o: In function `simple_prepare_write':
> (.text+0x209cd): undefined reference to `page_cache_size'
Sigh. You need this patch that I did not include
Variable Order Page Cache: Add functions to establish sizes
We use the macros PAGE_CACHE_SIZE PAGE_CACHE_SHIFT PAGE_CACHE_MASK
and PAGE_CACHE_ALIGN in various places in the kernel. These are now
the base page size but we do not have a means to calculating these
values for higher order pages.
Provide these functions. An address_space pointer must be passed
to them.
New function Related base page constant
---------------------------------------------------
page_cache_shift(a) PAGE_CACHE_SHIFT
page_cache_size(a) PAGE_CACHE_SIZE
page_cache_mask(a) PAGE_CACHE_MASK
page_cache_align(addr,a) PAGE_CACHE_ALIGN(addr)
Signed-off-by: Christoph Lameter <[email protected]>
---
include/linux/pagemap.h | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
Index: linux-2.6.21-rc7/include/linux/pagemap.h
===================================================================
--- linux-2.6.21-rc7.orig/include/linux/pagemap.h 2007-04-18 23:01:09.000000000 -0700
+++ linux-2.6.21-rc7/include/linux/pagemap.h 2007-04-18 23:03:32.000000000 -0700
@@ -49,6 +49,27 @@ static inline void mapping_set_gfp_mask(
#define PAGE_CACHE_MASK PAGE_MASK
#define PAGE_CACHE_ALIGN(addr) (((addr)+PAGE_CACHE_SIZE-1)&PAGE_CACHE_MASK)
+static inline int page_cache_shift(struct address_space *a)
+{
+ return a->order + PAGE_CACHE_SHIFT;
+}
+
+static inline unsigned long page_cache_size(struct address_space *a)
+{
+ return PAGE_CACHE_SIZE << a->order;
+}
+
+static inline unsigned long page_cache_mask(struct address_space *a)
+{
+ return PAGE_CACHE_MASK << a->order;
+}
+
+static inline unsigned long page_cache_align(unsigned long addr,
+ struct address_space *a)
+{
+ return (((addr) + page_cache_size(a) - 1) & page_cache_mask(a));
+}
+
#define page_cache_get(page) get_page(page)
#define page_cache_release(page) put_page(page)
void release_pages(struct page **pages, int nr, int cold);
-
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