linux-kernel - [PATCH 4.9 50/67] staging: lustre: llite: dont invoke direct

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Date:   Mon,  6 Nov 2017 10:44:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yang Sheng <yang.sheng@...el.com>,
        Bob Glossman <bob.glossman@...el.com>,
        Bobi Jam <bobijam@...mail.com>,
        Oleg Drokin <oleg.drokin@...el.com>,
        James Simmons <jsimmons@...radead.org>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 50/67] staging: lustre: llite: dont invoke direct_IO for the EOF case

4.9-stable review patch.  If anyone has any objections, please let me know.

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

From: Yang Sheng <yang.sheng@...el.com>


[ Upstream commit 77759771fb95420d23876cb104ab65c022613325 ]

The function generic_file_read_iter() does not check EOF
before invoke direct_IO callback. So we have to check it
ourselves.

Signed-off-by: Yang Sheng <yang.sheng@...el.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-8969
Reviewed-on: https://review.whamcloud.com/24552
Reviewed-by: Bob Glossman <bob.glossman@...el.com>
Reviewed-by: Bobi Jam <bobijam@...mail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@...el.com>
Signed-off-by: James Simmons <jsimmons@...radead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/staging/lustre/lustre/llite/rw26.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/staging/lustre/lustre/llite/rw26.c
+++ b/drivers/staging/lustre/lustre/llite/rw26.c
@@ -354,6 +354,10 @@ static ssize_t ll_direct_IO_26(struct ki
 	if (!lli->lli_has_smd)
 		return -EBADF;
 
+	/* Check EOF by ourselves */
+	if (iov_iter_rw(iter) == READ && file_offset >= i_size_read(inode))
+		return 0;
+
 	/* FIXME: io smaller than PAGE_SIZE is broken on ia64 ??? */
 	if ((file_offset & ~PAGE_MASK) || (count & ~PAGE_MASK))
 		return -EINVAL;