From: Theodore Ts'o <tytso@mit.edu>
Date: Wed, 31 Aug 2011 15:56:51 +0000 (-0400)
Subject: ext4: fake direct I/O mode for data=journal
X-Git-Tag: next-20110915~77^2~7
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=a64113b30254d51f9a02bf793455d7f2a601144c;p=karo-tx-linux.git

ext4: fake direct I/O mode for data=journal

Currently attempts to open a file with O_DIRECT in data=journal mode
causes the open to fail with -EINVAL.  This makes it very hard to test
data=journal mode.  So we will let the open succeed, but then always
fall back to O_DSYNC buffered writes.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 18d2558b7624..b84f127c085d 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2854,6 +2854,12 @@ static ssize_t ext4_direct_IO(int rw, struct kiocb *iocb,
 	struct inode *inode = file->f_mapping->host;
 	ssize_t ret;
 
+	/*
+	 * If we are doing data journalling we don't support O_DIRECT
+	 */
+	if (ext4_should_journal_data(inode))
+		return 0;
+
 	trace_ext4_direct_IO_enter(inode, offset, iov_length(iov, nr_segs), rw);
 	if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
 		ret = ext4_ext_direct_IO(rw, iocb, iov, offset, nr_segs);
@@ -2923,6 +2929,7 @@ static const struct address_space_operations ext4_journalled_aops = {
 	.bmap			= ext4_bmap,
 	.invalidatepage		= ext4_invalidatepage,
 	.releasepage		= ext4_releasepage,
+	.direct_IO		= ext4_direct_IO,
 	.is_partially_uptodate  = block_is_partially_uptodate,
 	.error_remove_page	= generic_error_remove_page,
 };