3.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dave Chinner <dchin...@redhat.com>
commit 834ffca6f7e345a79f6f2e2d131b0dfba8a4b67a upstream.
Similar to direct IO reads, direct IO writes are using
truncate_pagecache_range to invalidate the page cache. This is
incorrect due to the sub-block zeroing in the page cache that
truncate_pagecache_range() triggers.
This patch fixes things by using invalidate_inode_pages2_range
instead. It preserves the page cache invalidation, but won't zero
any pages.
Signed-off-by: Dave Chinner <dchin...@redhat.com>
Reviewed-by: Brian Foster <bfos...@redhat.com>
Reviewed-by: Christoph Hellwig <h...@lst.de>
Signed-off-by: Dave Chinner <da...@fromorbit.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
fs/xfs/xfs_file.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -683,7 +683,15 @@ xfs_file_dio_aio_write(
pos, -1);
if (ret)
goto out;
- truncate_pagecache_range(VFS_I(ip), pos, -1);
+ /*
+ * Invalidate whole pages. This can return an error if
+ * we fail to invalidate a page, but this should never
+ * happen on XFS. Warn if it does fail.
+ */
+ ret = invalidate_inode_pages2_range(VFS_I(ip)->i_mapping,
+ pos >> PAGE_CACHE_SHIFT, -1);
+ WARN_ON_ONCE(ret);
+ ret = 0;
}
/*
--
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