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NFSv42: Fix pagecache invalidation after COPY/CLONE
commit3f015d89a4
upstream. The mechanism in use to allow the client to see the results of COPY/CLONE is to drop those pages from the pagecache. This forces the client to read those pages once more from the server. However, truncate_pagecache_range() zeros out partial pages instead of dropping them. Let us instead use invalidate_inode_pages2_range() with full-page offsets to ensure the client properly sees the results of COPY/CLONE operations. Cc: <stable@vger.kernel.org> # v4.7+ Fixes:2e72448b07
("NFS: Add COPY nfs operation") Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 3 additions and 2 deletions
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@ -295,8 +295,9 @@ static ssize_t _nfs42_proc_copy(struct file *src,
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goto out;
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}
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truncate_pagecache_range(dst_inode, pos_dst,
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pos_dst + res->write_res.count);
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WARN_ON_ONCE(invalidate_inode_pages2_range(dst_inode->i_mapping,
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pos_dst >> PAGE_SHIFT,
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(pos_dst + res->write_res.count - 1) >> PAGE_SHIFT));
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status = res->write_res.count;
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out:
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