Messages in this thread Patch in this message | | | Date | Thu, 13 Sep 2007 22:19:20 +0200 | From | Richard Knutsson <> | Subject | Re: [PATCH] add page->mapping handling interface [1/35] interface definitions |
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KAMEZAWA Hiroyuki wrote: > - changes page->mapping from address_space* to unsigned long > - add page_mapping_anon() function. > - add linux/page-cache.h > - add page_inode() function > - add page_is_pagecache() function > - add pagecaceh_consisten() function for pagecache consistency test. > - expoterd swapper_space. inline function page_mapping() refers this. > > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> > > --- > include/linux/fs.h | 1 + > include/linux/mm.h | 20 +++++++++++++++++--- > include/linux/mm_types.h | 2 +- > include/linux/page-cache.h | 39 +++++++++++++++++++++++++++++++++++++++ > mm/swap_state.c | 2 ++ > 5 files changed, 60 insertions(+), 4 deletions(-) > > Index: test-2.6.23-rc4-mm1/include/linux/page-cache.h > =================================================================== > --- /dev/null > +++ test-2.6.23-rc4-mm1/include/linux/page-cache.h > @@ -0,0 +1,39 @@ > +/* > + * For interface definitions between memory management and file systems. > + * - This file defines small interface functions for handling page cache. > + */ > + > +#ifndef _LINUX_PAGECACHE_H > +#define _LINUX_PAGECACHE_H > + > +#include <linux/mm.h> > +/* page_mapping_xxx() function is defined in mm.h */ > + > +static inline int page_is_pagecache(struct page *page) > Why return it as an 'int' instead of 'bool'? > +{ > + if (!page->mapping || (page->mapping & PAGE_MAPPING_ANON)) > + return 0; > + return 1; > +} > Not easier with 'return page->mapping && (page->mapping & PAGE_MAPPING_ANON) == 0;'? > + > +/* > + * Return an inode this page belongs to > + */ > + > +static inline struct inode *page_inode(struct page *page) > +{ > + if (!page_is_pagecache(page)) > + return NULL; > + return page_mapping_cache(page)->host; > +} > + > +/* > + * Test a page is a page-cache of an address_space. > + */ > +static inline int > +pagecache_consistent(struct page *page, struct address_space *as) > +{ > + return (page_mapping(page) == as); > +} > + > +#endif <snip> > Index: test-2.6.23-rc4-mm1/include/linux/mm.h > =================================================================== > --- test-2.6.23-rc4-mm1.orig/include/linux/mm.h > +++ test-2.6.23-rc4-mm1/include/linux/mm.h > @@ -563,7 +563,7 @@ void page_address_init(void); > extern struct address_space swapper_space; > static inline struct address_space *page_mapping(struct page *page) > { > - struct address_space *mapping = page->mapping; > + struct address_space *mapping = (struct address_space *)page->mapping; > > VM_BUG_ON(PageSlab(page)); > if (unlikely(PageSwapCache(page))) > @@ -579,7 +579,21 @@ static inline struct address_space *page > > static inline int PageAnon(struct page *page) > Change to bool? Then "you" can also remove the '!!' from: mm/memory.c:483: rss[!!PageAnon(page)]++; > { > - return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0; > + return (page->mapping & PAGE_MAPPING_ANON) != 0; > +} > + > <snip>
If you don't mind bool(eans) (for some reason), I can/will check out the rest.
Richard Knutsson
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