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NFSv42: Fix pagecache invalidation after COPY/CLONE

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commit 3f015d89a4 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>
This commit is contained in:
Benjamin Coddington 2021-11-16 10:48:13 -05:00 committed by Greg Kroah-Hartman
parent c537846f72
commit 2387ff2f17
1 changed files with 3 additions and 2 deletions
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5
fs/nfs/nfs42proc.c
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@ -186,8 +186,9 @@ static ssize_t _nfs42_proc_copy(struct file *src,
goto out;
}
truncate_pagecache_range(dst_inode, pos_dst,
pos_dst + res->write_res.count);
WARN_ON_ONCE(invalidate_inode_pages2_range(dst_inode->i_mapping,
pos_dst >> PAGE_SHIFT,
(pos_dst + res->write_res.count - 1) >> PAGE_SHIFT));
status = res->write_res.count;
out: