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[CIFS] use simple_prepare_write to zero page data 

It's common for file systems to need to zero data on either side of a
write, if a page is not Uptodate during prepare_write.  It just so happens
that simple_prepare_write() in libfs.c does exactly that, so we can avoid
duplication and just call that function to zero page data.

Signed-off-by: Nate Diller <nate.diller@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Nate 2007-07-16 15:45:13 +00:00 committed by Steve French
parent 4a379e6657
commit 8803863a90
1 changed files with 1 additions and 8 deletions
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9
fs/cifs/file.c
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@ -1966,14 +1966,7 @@ static int cifs_prepare_write(struct file *file, struct page *page,
* We don't need to read data beyond the end of the file.
* zero it, and set the page uptodate
*/
void *kaddr = kmap_atomic(page, KM_USER0);
if (from)
memset(kaddr, 0, from);
if (to < PAGE_CACHE_SIZE)
memset(kaddr + to, 0, PAGE_CACHE_SIZE - to);
flush_dcache_page(page);
kunmap_atomic(kaddr, KM_USER0);
simple_prepare_write(file, page, from, to);
SetPageUptodate(page);
} else if ((file->f_flags & O_ACCMODE) != O_WRONLY) {
/* might as well read a page, it is fast enough */