fuse: fix fuse_write_end() if zero bytes were copied
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 <viro@zeniv.linux.org.uk>
Fixes: 6b12c1b37e
("fuse: Implement write_begin/write_end callbacks")
Cc: <stable@vger.kernel.org> # v3.15+
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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@ -1985,6 +1985,10 @@ static int fuse_write_end(struct file *file, struct address_space *mapping,
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{
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struct inode *inode = page->mapping->host;
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/* Haven't copied anything? Skip zeroing, size extending, dirtying. */
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if (!copied)
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goto unlock;
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if (!PageUptodate(page)) {
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/* Zero any unwritten bytes at the end of the page */
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size_t endoff = (pos + copied) & ~PAGE_MASK;
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@ -1995,6 +1999,8 @@ static int fuse_write_end(struct file *file, struct address_space *mapping,
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fuse_write_update_size(inode, pos + copied);
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set_page_dirty(page);
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unlock:
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unlock_page(page);
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put_page(page);
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