>From 35947e6535d92c54cf523470cc8811e8b5fee3e5 Mon Sep 17 00:00:00 2001
From: Gu Zheng <guz.f...@cn.fujitsu.com>
Date: Tue, 23 Apr 2013 16:09:04 +0800
Subject: [PATCH] mm/filemap.c: fix criteria of calling iov_shorten() in
generic_file_direct_write()
generic_file_direct_write() compares 'count'(the max count we actually can
write)
with 'ocount'(the count we request to write) to see if there is need to call
iov_shorten() to reduce number of segments and the iovec's length. If the
'count' is equal or greater than 'ocount', there is no need to call
iov_shorten()
indeed. So the judgement should be changed:
'if (count != ocount)' --> 'if (count < ocount)'
Signed-off-by: Gu Zheng <guz.f...@cn.fujitsu.com>
---
mm/filemap.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index e1979fd..c566b9c 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2183,7 +2183,7 @@ generic_file_direct_write(struct kiocb *iocb, const
struct iovec *iov,
size_t write_len;
pgoff_t end;
- if (count != ocount)
+ if (count < ocount)
*nr_segs = iov_shorten((struct iovec *)iov, *nr_segs, count);
write_len = iov_length(iov, *nr_segs);
--
1.7.7
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
