nfsd4: "backfill" using write_bytes_to_xdr_buf

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Normally xdr encoding proceeds in a single pass from start of a buffer
to end, but sometimes we have to write a few bytes to an earlier
position.

Use write_bytes_to_xdr_buf for these cases rather than saving a pointer
to write to.  We plan to rewrite xdr_reserve_space to handle encoding
across page boundaries using a scratch buffer, and don't want to risk
writing to a pointer that was contained in a scratch buffer.

Also it will no longer be safe to calculate lengths by subtracting two
pointers, so use xdr_buf offsets instead.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

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This commit is contained in:

J. Bruce Fields 2013-08-29 15:42:52 -04:00

parent 1fcea5b20b

commit 082d4bd72a

1 changed files with 26 additions and 19 deletions

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fs/nfsd/nfs4xdr.c

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