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fs: convert core functions to zero_user_page

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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.

[[email protected]: fix a few things]
Signed-off-by: Nate Diller <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Nate Diller 2007-05-09 02:35:07 -07:00 • committed by Linus Torvalds
commit 01f2705daf
7 changed files with 42 additions and 81 deletions
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15
fs/mpage.c
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@ -284,11 +284,9 @@ do_mpage_readpage(struct bio *bio, struct page *page, unsigned nr_pages,
}
if (first_hole != blocks_per_page) {
char *kaddr = kmap_atomic(page, KM_USER0);
memset(kaddr + (first_hole << blkbits), 0,
PAGE_CACHE_SIZE - (first_hole << blkbits));
flush_dcache_page(page);
kunmap_atomic(kaddr, KM_USER0);
zero_user_page(page, first_hole << blkbits,
PAGE_CACHE_SIZE - (first_hole << blkbits),
KM_USER0);
if (first_hole == 0) {
SetPageUptodate(page);
unlock_page(page);
@ -576,14 +574,11 @@ page_is_mapped:
* written out to the file."
*/
unsigned offset = i_size & (PAGE_CACHE_SIZE - 1);
char *kaddr;
if (page->index > end_index || !offset)
goto confused;
kaddr = kmap_atomic(page, KM_USER0);
memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
flush_dcache_page(page);
kunmap_atomic(kaddr, KM_USER0);
zero_user_page(page, offset, PAGE_CACHE_SIZE - offset,
KM_USER0);
}
/*