From 01f2705daf5a36208e69d7cf95db9c330f843af6 Mon Sep 17 00:00:00 2001 From: Nate Diller Date: Wed, 9 May 2007 02:35:07 -0700 Subject: fs: convert core functions to zero_user_page It's very common for file systems to need to zero part or all of a page, the simplist way is just to use kmap_atomic() and memset(). There's actually a library function in include/linux/highmem.h that does exactly that, but it's confusingly named memclear_highpage_flush(), which is descriptive of *how* it does the work rather than what the *purpose* is. So this patchset renames the function to zero_user_page(), and calls it from the various places that currently open code it. This first patch introduces the new function call, and converts all the core kernel callsites, both the open-coded ones and the old memclear_highpage_flush() ones. Following this patch is a series of conversions for each file system individually, per AKPM, and finally a patch deprecating the old call. The diffstat below shows the entire patchset. [akpm@linux-foundation.org: fix a few things] Signed-off-by: Nate Diller Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/truncate.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'mm/truncate.c') diff --git a/mm/truncate.c b/mm/truncate.c index 0f4b6d18ab0..4fbe1a2da5f 100644 --- a/mm/truncate.c +++ b/mm/truncate.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include #include /* grr. try_to_release_page, @@ -46,7 +47,7 @@ void do_invalidatepage(struct page *page, unsigned long offset) static inline void truncate_partial_page(struct page *page, unsigned partial) { - memclear_highpage_flush(page, partial, PAGE_CACHE_SIZE-partial); + zero_user_page(page, partial, PAGE_CACHE_SIZE - partial, KM_USER0); if (PagePrivate(page)) do_invalidatepage(page, partial); } -- cgit v1.2.3