+ fs-block_devc-fix-iov_shorten-criteria-in-blkdev_aio_read.patch added to -mm tree

+ fs-block_devc-fix-iov_shorten-criteria-in-blkdev_aio_read.patch added to -mm tree

[akpm]

The patch titled
     Subject: fs/block_dev.c: fix iov_shorten() criteria in blkdev_aio_read()
has been added to the -mm tree.  Its filename is
     fs-block_devc-fix-iov_shorten-criteria-in-blkdev_aio_read.patch

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------------------------------------------------------
From: Gu Zheng <guz.fnst@cn.fujitsu.com>
Subject: fs/block_dev.c: fix iov_shorten() criteria in blkdev_aio_read()

blkdev_aio_read() test 'size' to see if it is equal or greater than the
target count we request(iocb->ki_left).  If so there is no need to call
iov_shorten() to reduce number of segments and the iovec's length.  So the
judgement should be changed to 'if (size < iocb->ki_left)' instead.

Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/block_dev.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN fs/block_dev.c~fs-block_devc-fix-iov_shorten-criteria-in-blkdev_aio_read fs/block_dev.c
--- a/fs/block_dev.c~fs-block_devc-fix-iov_shorten-criteria-in-blkdev_aio_read
+++ a/fs/block_dev.c
@@ -1559,7 +1559,7 @@ static ssize_t blkdev_aio_read(struct ki
 		return 0;
 
 	size -= pos;
-	if (size < INT_MAX)
+	if (size < iocb->ki_left)
 		nr_segs = iov_shorten((struct iovec *)iov, nr_segs, size);
 	return generic_file_aio_read(iocb, iov, nr_segs, pos);
 }
_

Patches currently in -mm which might be from guz.fnst@cn.fujitsu.com are

fs-block_devc-fix-iov_shorten-criteria-in-blkdev_aio_read.patch