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Date: Mon, 15 Sep 2014 12:26:51 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Dave Chinner <dchinner@...hat.com>, Brian Foster <bfoster@...hat.com>, Christoph Hellwig <hch@....de>, Dave Chinner <david@...morbit.com> Subject: [PATCH 3.10 53/71] xfs: dont zero partial page cache pages during O_DIRECT writes 3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dave Chinner <dchinner@...hat.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 <dchinner@...hat.com> Reviewed-by: Brian Foster <bfoster@...hat.com> Reviewed-by: Christoph Hellwig <hch@....de> Signed-off-by: Dave Chinner <david@...morbit.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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 @@ -677,7 +677,15 @@ 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; } /* -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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