From: "Darrick J. Wong" darrick.wong@oracle.com
commit 4918ef4ea008cd2ff47eb852894e3f9b9047f4f3 upstream.
Prior to remapping blocks, it is necessary to remove pages from the destination file's page cache. Unfortunately, the truncation is not aggressive enough -- if page size > block size, we'll end up zeroing subpage blocks instead of removing them. So, round the start offset down and the end offset up to page boundaries. We already wrote all the dirty data so the larger range shouldn't be a problem.
Signed-off-by: Darrick J. Wong darrick.wong@oracle.com Reviewed-by: Dave Chinner dchinner@redhat.com Reviewed-by: Christoph Hellwig hch@lst.de Signed-off-by: Dave Chinner david@fromorbit.com Signed-off-by: Luis Chamberlain mcgrof@kernel.org --- fs/xfs/xfs_reflink.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 7088f44c0c59..38ea08a3dd1d 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -1369,8 +1369,9 @@ xfs_reflink_remap_prep( goto out_unlock;
/* Zap any page cache for the destination file's range. */ - truncate_inode_pages_range(&inode_out->i_data, pos_out, - PAGE_ALIGN(pos_out + *len) - 1); + truncate_inode_pages_range(&inode_out->i_data, + round_down(pos_out, PAGE_SIZE), + round_up(pos_out + *len, PAGE_SIZE) - 1);
/* If we're altering the file contents... */ if (!is_dedupe) {