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ocfs2: make __ocfs2_page_mkwrite handle file end properly. 

__ocfs2_page_mkwrite now is broken in handling file end.
1. the last page should be the page contains i_size - 1.
2. the len in the last page is also calculated wrong.
So change them accordingly.

Acked-by: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Tao Ma <tao.ma@oracle.com>
This commit is contained in:
Tao Ma 2010-07-17 21:45:49 +08:00
parent f5ce5a08a4
commit f63afdb2c3
1 changed files with 5 additions and 3 deletions
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8
fs/ocfs2/mmap.c
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@ -74,9 +74,11 @@ static int __ocfs2_page_mkwrite(struct inode *inode, struct buffer_head *di_bh,
/*
* Another node might have truncated while we were waiting on
* cluster locks.
* We don't check size == 0 before the shift. This is borrowed
* from do_generic_file_read.
*/
last_index = size >> PAGE_CACHE_SHIFT;
if (page->index > last_index) {
last_index = (size - 1) >> PAGE_CACHE_SHIFT;
if (unlikely(!size || page->index > last_index)) {
ret = -EINVAL;
goto out;
}
@ -107,7 +109,7 @@ static int __ocfs2_page_mkwrite(struct inode *inode, struct buffer_head *di_bh,
* because the "write" would invalidate their data.
*/
if (page->index == last_index)
len = size & ~PAGE_CACHE_MASK;
len = ((size - 1) & ~PAGE_CACHE_MASK) + 1;
ret = ocfs2_write_begin_nolock(mapping, pos, len, 0, &locked_page,
&fsdata, di_bh, page);