NFSD: Update NFSv3 READDIR entry encoders to use struct xdr_stream

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The benefit of the xdr_stream helpers is that they transparently
handle encoding an XDR data item that crosses page boundaries.
Most of the open-coded logic to do that here can be eliminated.

A sub-buffer and sub-stream are set up as a sink buffer for the
directory entry encoder. As an entry is encoded, it is added to
the end of the content in this buffer/stream. The total length of
the directory list is tracked in the buffer's @len field.

When it comes time to encode the Reply, the sub-buffer is merged
into rq_res's page array at the correct place using
xdr_write_pages().

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

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This commit is contained in:

Chuck Lever 2020-10-22 19:46:58 -04:00

parent e4ccfe3014

commit 7f87fc2d34

3 changed files with 185 additions and 30 deletions

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35

fs/nfsd/nfs3proc.c

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166

fs/nfsd/nfs3xdr.c

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14

fs/nfsd/xdr3.h

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