From: Andrew Morton <akpm@osdl.org>

RLIMIT_FSIZE can cause generic_write_checks() to reduce `count'.  So we cannot
assume that `count' is equal to the total size of the incoming iovec.

Cc: Vladimir Saveliev <vs@namesys.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hans Reiser <reiser@namesys.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: Nathan Scott <nathans@sgi.com>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 mm/filemap.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff -puN mm/filemap.c~add-address_space_operationsbatch_write-fix mm/filemap.c
--- a/mm/filemap.c~add-address_space_operationsbatch_write-fix
+++ a/mm/filemap.c
@@ -2224,9 +2224,9 @@ generic_file_buffered_write(struct kiocb
 	do {
 		/* do not walk over current segment */
 		desc.buf = cur_iov->iov_base + iov_base;
-		desc.count = cur_iov->iov_len - iov_base;
+		desc.count = min(count, cur_iov->iov_len - iov_base);
 		if (desc.count > 0)
-			status = batch_write(file, &desc, &copied);
+			status = (*batch_write)(file, &desc, &copied);
 		else {
 			copied = 0;
 			status = 0;
_