[PATCH 3.16 230/306] fuse: fix fuse_write_end() if zero bytes were copied

[Ben Hutchings]

3.16.40-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Miklos Szeredi <mszer...@redhat.com>

commit 59c3b76cc61d1d676f965c192cc7969aa5cb2744 upstream.

If pos is at the beginning of a page and copied is zero then page is not
zeroed but is marked uptodate.

Fix by skipping everything except unlock/put of page if zero bytes were
copied.

Reported-by: Al Viro <v...@zeniv.linux.org.uk>
Fixes: 6b12c1b37e55 ("fuse: Implement write_begin/write_end callbacks")
Signed-off-by: Miklos Szeredi <mszer...@redhat.com>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
 fs/fuse/file.c | 6 ++++++
 1 file changed, 6 insertions(+)

--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2058,6 +2058,10 @@ static int fuse_write_end(struct file *f
 {
        struct inode *inode = page->mapping->host;
 
+       /* Haven't copied anything?  Skip zeroing, size extending, dirtying. */
+       if (!copied)
+               goto unlock;
+
        if (!PageUptodate(page)) {
                /* Zero any unwritten bytes at the end of the page */
                size_t endoff = (pos + copied) & ~PAGE_CACHE_MASK;
@@ -2068,6 +2072,8 @@ static int fuse_write_end(struct file *f
 
        fuse_write_update_size(inode, pos + copied);
        set_page_dirty(page);
+
+unlock:
        unlock_page(page);
        page_cache_release(page);