NFS: Ensure we return zero if applications attempt to write zero bytes
A zero byte count direct write request should be a successful no-op, not an error. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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@ -890,6 +890,8 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
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retval = generic_write_checks(file, &pos, &count, 0);
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if (retval)
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goto out;
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if (!count)
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goto out; /* return 0 */
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retval = -EINVAL;
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if ((ssize_t) count < 0)
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