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Commit b9de313c authored by Al Viro's avatar Al Viro
Browse files

fix ceph_write_end() 



don't zero on short copies; if the page was uptodate it's just plain
wrong, and if it wasn't we'll be better off just returning 0 and
buggering off.

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent c0cf3ef5

fs/ceph/addr.c

+8 −6
Original line number Diff line number Diff line
@@ -1276,25 +1276,27 @@ static int ceph_write_end(struct file *file, struct address_space *mapping, 
			  struct page *page, void *fsdata)

{

	struct inode *inode = file_inode(file);

	unsigned from = pos & (PAGE_SIZE - 1);

	int check_cap = 0;



	dout("write_end file %p inode %p page %p %d~%d (%d)\n", file,

	     inode, page, (int)pos, (int)copied, (int)len);



	/* zero the stale part of the page if we did a short copy */

	if (copied < len)

		zero_user_segment(page, from+copied, len);

	if (!PageUptodate(page)) {

		if (copied < len) {

			copied = 0;

			goto out;

		}

		SetPageUptodate(page);

	}



	/* did file size increase? */

	if (pos+copied > i_size_read(inode))

		check_cap = ceph_inode_set_size(inode, pos+copied);



	if (!PageUptodate(page))

		SetPageUptodate(page);



	set_page_dirty(page);



out:

	unlock_page(page);

	put_page(page);