diff options
| author | Nate Diller <nate.diller@gmail.com> | 2007-05-09 02:35:07 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-09 12:30:55 -0700 |
| commit | 01f2705daf5a36208e69d7cf95db9c330f843af6 (patch) | |
| tree | 2d2c7a042c2466ed985f6e0950450c099f02725f /mm/truncate.c | |
| parent | 38a23e311b6cd389b9d8af2ea6c28c8cffbe581c (diff) | |
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 <nate.diller@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/truncate.c')
| -rw-r--r-- | mm/truncate.c | 3 |
1 files changed, 2 insertions, 1 deletions
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 <linux/swap.h> #include <linux/module.h> #include <linux/pagemap.h> +#include <linux/highmem.h> #include <linux/pagevec.h> #include <linux/task_io_accounting_ops.h> #include <linux/buffer_head.h> /* 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); } |