From: Chuck Lever <chuck.lever@oracle.com>
To: Anna Schumaker <schumaker.anna@gmail.com>,
Bruce Fields <bfields@redhat.com>
Cc: Linux NFS Mailing List <linux-nfs@vger.kernel.org>,
Anna Schumaker <Anna.Schumaker@Netapp.com>
Subject: Re: [PATCH v2 1/4] NFSD: Return eof and maxcount to nfsd4_encode_read()
Date: Fri, 14 Feb 2020 17:20:37 -0500 [thread overview]
Message-ID: <8293E6BD-F063-4872-848F-93196C87DA02@oracle.com> (raw)
In-Reply-To: <20200214211206.407725-2-Anna.Schumaker@Netapp.com>
> On Feb 14, 2020, at 4:12 PM, schumaker.anna@gmail.com wrote:
>
> From: Anna Schumaker <Anna.Schumaker@Netapp.com>
>
> I want to reuse nfsd4_encode_readv() and nfsd4_encode_splice_read() in
> READ_PLUS rather than reimplementing them. READ_PLUS returns a single
> eof flag for the entire call and a separate maxcount for each data
> segment, so we need to have the READ call encode these values in a
> different place.
This probably collides pretty nastily with the fix I posted today for
https://bugzilla.kernel.org/show_bug.cgi?id=198053 .
Can my fix go in first so that there is still opportunity to backport it?
> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
> ---
> fs/nfsd/nfs4xdr.c | 60 ++++++++++++++++++++---------------------------
> 1 file changed, 26 insertions(+), 34 deletions(-)
>
> diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
> index 9761512674a0..45f0623f6488 100644
> --- a/fs/nfsd/nfs4xdr.c
> +++ b/fs/nfsd/nfs4xdr.c
> @@ -3521,23 +3521,22 @@ nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struc
>
> static __be32 nfsd4_encode_splice_read(
> struct nfsd4_compoundres *resp,
> - struct nfsd4_read *read,
> - struct file *file, unsigned long maxcount)
> + struct nfsd4_read *read, struct file *file,
> + unsigned long *maxcount, u32 *eof)
> {
> struct xdr_stream *xdr = &resp->xdr;
> struct xdr_buf *buf = xdr->buf;
> - u32 eof;
> + long len;
> int space_left;
> __be32 nfserr;
> - __be32 *p = xdr->p - 2;
>
> /* Make sure there will be room for padding if needed */
> if (xdr->end - xdr->p < 1)
> return nfserr_resource;
>
> + len = *maxcount;
> nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
> - file, read->rd_offset, &maxcount, &eof);
> - read->rd_length = maxcount;
> + file, read->rd_offset, maxcount, eof);
> if (nfserr) {
> /*
> * nfsd_splice_actor may have already messed with the
> @@ -3548,24 +3547,21 @@ static __be32 nfsd4_encode_splice_read(
> return nfserr;
> }
>
> - *(p++) = htonl(eof);
> - *(p++) = htonl(maxcount);
> -
> - buf->page_len = maxcount;
> - buf->len += maxcount;
> - xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
> + buf->page_len = *maxcount;
> + buf->len += *maxcount;
> + xdr->page_ptr += (buf->page_base + *maxcount + PAGE_SIZE - 1)
> / PAGE_SIZE;
>
> /* Use rest of head for padding and remaining ops: */
> buf->tail[0].iov_base = xdr->p;
> buf->tail[0].iov_len = 0;
> xdr->iov = buf->tail;
> - if (maxcount&3) {
> - int pad = 4 - (maxcount&3);
> + if (*maxcount&3) {
> + int pad = 4 - (*maxcount&3);
>
> *(xdr->p++) = 0;
>
> - buf->tail[0].iov_base += maxcount&3;
> + buf->tail[0].iov_base += *maxcount&3;
> buf->tail[0].iov_len = pad;
> buf->len += pad;
> }
> @@ -3579,22 +3575,20 @@ static __be32 nfsd4_encode_splice_read(
> }
>
> static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
> - struct nfsd4_read *read,
> - struct file *file, unsigned long maxcount)
> + struct nfsd4_read *read, struct file *file,
> + unsigned long *maxcount, u32 *eof)
> {
> struct xdr_stream *xdr = &resp->xdr;
> - u32 eof;
> int v;
> int starting_len = xdr->buf->len - 8;
> long len;
> int thislen;
> __be32 nfserr;
> - __be32 tmp;
> __be32 *p;
> u32 zzz = 0;
> int pad;
>
> - len = maxcount;
> + len = *maxcount;
> v = 0;
>
> thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
> @@ -3616,22 +3610,15 @@ static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
> }
> read->rd_vlen = v;
>
> - len = maxcount;
> + len = *maxcount;
> nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
> - resp->rqstp->rq_vec, read->rd_vlen, &maxcount,
> - &eof);
> - read->rd_length = maxcount;
> + resp->rqstp->rq_vec, read->rd_vlen, maxcount, eof);
> if (nfserr)
> return nfserr;
> - xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
> + xdr_truncate_encode(xdr, starting_len + 8 + ((*maxcount+3)&~3));
>
> - tmp = htonl(eof);
> - write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
> - tmp = htonl(maxcount);
> - write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
> -
> - pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
> - write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
> + pad = (*maxcount&3) ? 4 - (*maxcount&3) : 0;
> + write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + *maxcount,
> &zzz, pad);
> return 0;
>
> @@ -3642,6 +3629,7 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
> struct nfsd4_read *read)
> {
> unsigned long maxcount;
> + u32 eof;
> struct xdr_stream *xdr = &resp->xdr;
> struct file *file;
> int starting_len = xdr->buf->len;
> @@ -3670,13 +3658,17 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
>
> if (file->f_op->splice_read &&
> test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
> - nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
> + nfserr = nfsd4_encode_splice_read(resp, read, file, &maxcount, &eof);
> else
> - nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
> + nfserr = nfsd4_encode_readv(resp, read, file, &maxcount, &eof);
>
> if (nfserr)
> xdr_truncate_encode(xdr, starting_len);
>
> + read->rd_length = maxcount;
> + *p++ = htonl(eof);
> + *p++ = htonl(maxcount);
> +
> return nfserr;
> }
>
> --
> 2.25.0
>
--
Chuck Lever
next prev parent reply other threads:[~2020-02-14 22:20 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-14 21:12 [PATCH v2 0/4] NFSD: Add support for the v4.2 READ_PLUS operation schumaker.anna
2020-02-14 21:12 ` [PATCH v2 1/4] NFSD: Return eof and maxcount to nfsd4_encode_read() schumaker.anna
2020-02-14 22:20 ` Chuck Lever [this message]
2020-02-17 19:52 ` J. Bruce Fields
2020-02-14 21:12 ` [PATCH v2 2/4] NFSD: Add READ_PLUS data support schumaker.anna
2020-02-14 21:12 ` [PATCH v2 3/4] NFSD: Add READ_PLUS hole segment encoding schumaker.anna
2020-02-14 21:12 ` [PATCH v2 4/4] NFSD: Encode a full READ_PLUS reply schumaker.anna
2020-03-03 15:08 ` [PATCH v2 0/4] NFSD: Add support for the v4.2 READ_PLUS operation J. Bruce Fields
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