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Thu, 23 Jan 2020 16:47:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1579798061; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=i36g49Wr23XnPzHPj1e2Sazsa2bVz3Y92a1xoz/YYmg=; b=SQddhb2DhyVwMPhmF48Q2b56+USzeHf7agvSv9bgrqKlZ5EvejoCWHmZlBJ2hOFFBVlPX+ F8wLLw7q1XvAyyqjM/K0vsOljRYrcXtr28etioZMz5xRyea/z684Qr5JxX4tPEfl82hpuv nZAKCpuzpzLpsVDgkhjnNPxJAu70C9g= From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, stefanha@redhat.com Subject: [PULL 041/108] virtiofsd: Plumb fuse_bufvec through to do_write_buf Date: Thu, 23 Jan 2020 16:45:23 +0000 Message-Id: <20200123164630.91498-42-dgilbert@redhat.com> In-Reply-To: <20200123164630.91498-1-dgilbert@redhat.com> References: <20200123164630.91498-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-MC-Unique: CpqhfcZkN16Gqv8RIiVAdA-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.61 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" From: "Dr. David Alan Gilbert" Let fuse_session_process_buf_int take a fuse_bufvec * instead of a fuse_buf; and then through to do_write_buf - where in the best case it can pass that straight through to op.write_buf without copying (other than skipping a header). Signed-off-by: Dr. David Alan Gilbert Signed-off-by: Stefan Hajnoczi Reviewed-by: Masayoshi Mizuma Signed-off-by: Dr. David Alan Gilbert --- tools/virtiofsd/fuse_i.h | 2 +- tools/virtiofsd/fuse_lowlevel.c | 61 ++++++++++++++++++++++----------- tools/virtiofsd/fuse_virtio.c | 3 +- 3 files changed, 44 insertions(+), 22 deletions(-) diff --git a/tools/virtiofsd/fuse_i.h b/tools/virtiofsd/fuse_i.h index 45995f3246..a20854f1c4 100644 --- a/tools/virtiofsd/fuse_i.h +++ b/tools/virtiofsd/fuse_i.h @@ -100,7 +100,7 @@ int fuse_send_reply_iov_nofree(fuse_req_t req, int erro= r, struct iovec *iov, void fuse_free_req(fuse_req_t req); =20 void fuse_session_process_buf_int(struct fuse_session *se, - const struct fuse_buf *buf, + struct fuse_bufvec *bufv, struct fuse_chan *ch); =20 =20 diff --git a/tools/virtiofsd/fuse_lowlevel.c b/tools/virtiofsd/fuse_lowleve= l.c index 95f4db8fcf..7e10995adc 100644 --- a/tools/virtiofsd/fuse_lowlevel.c +++ b/tools/virtiofsd/fuse_lowlevel.c @@ -1004,11 +1004,12 @@ static void do_write(fuse_req_t req, fuse_ino_t nod= eid, const void *inarg) } =20 static void do_write_buf(fuse_req_t req, fuse_ino_t nodeid, const void *in= arg, - const struct fuse_buf *ibuf) + struct fuse_bufvec *ibufv) { struct fuse_session *se =3D req->se; - struct fuse_bufvec bufv =3D { - .buf[0] =3D *ibuf, + struct fuse_bufvec *pbufv =3D ibufv; + struct fuse_bufvec tmpbufv =3D { + .buf[0] =3D ibufv->buf[0], .count =3D 1, }; struct fuse_write_in *arg =3D (struct fuse_write_in *)inarg; @@ -1018,22 +1019,31 @@ static void do_write_buf(fuse_req_t req, fuse_ino_t= nodeid, const void *inarg, fi.fh =3D arg->fh; fi.writepage =3D arg->write_flags & FUSE_WRITE_CACHE; =20 - fi.lock_owner =3D arg->lock_owner; - fi.flags =3D arg->flags; - if (!(bufv.buf[0].flags & FUSE_BUF_IS_FD)) { - bufv.buf[0].mem =3D PARAM(arg); - } - - bufv.buf[0].size -=3D - sizeof(struct fuse_in_header) + sizeof(struct fuse_write_in); - if (bufv.buf[0].size < arg->size) { - fuse_log(FUSE_LOG_ERR, "fuse: do_write_buf: buffer size too small\= n"); - fuse_reply_err(req, EIO); - return; + if (ibufv->count =3D=3D 1) { + fi.lock_owner =3D arg->lock_owner; + fi.flags =3D arg->flags; + if (!(tmpbufv.buf[0].flags & FUSE_BUF_IS_FD)) { + tmpbufv.buf[0].mem =3D PARAM(arg); + } + tmpbufv.buf[0].size -=3D + sizeof(struct fuse_in_header) + sizeof(struct fuse_write_in); + if (tmpbufv.buf[0].size < arg->size) { + fuse_log(FUSE_LOG_ERR, + "fuse: do_write_buf: buffer size too small\n"); + fuse_reply_err(req, EIO); + return; + } + tmpbufv.buf[0].size =3D arg->size; + pbufv =3D &tmpbufv; + } else { + /* + * Input bufv contains the headers in the first element + * and the data in the rest, we need to skip that first element + */ + ibufv->buf[0].size =3D 0; } - bufv.buf[0].size =3D arg->size; =20 - se->op.write_buf(req, nodeid, &bufv, arg->offset, &fi); + se->op.write_buf(req, nodeid, pbufv, arg->offset, &fi); } =20 static void do_flush(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) @@ -2024,13 +2034,24 @@ static const char *opname(enum fuse_opcode opcode) void fuse_session_process_buf(struct fuse_session *se, const struct fuse_buf *buf) { - fuse_session_process_buf_int(se, buf, NULL); + struct fuse_bufvec bufv =3D { .buf[0] =3D *buf, .count =3D 1 }; + fuse_session_process_buf_int(se, &bufv, NULL); } =20 +/* + * Restriction: + * bufv is normally a single entry buffer, except for a write + * where (if it's in memory) then the bufv may be multiple entries, + * where the first entry contains all headers and subsequent entries + * contain data + * bufv shall not use any offsets etc to make the data anything + * other than contiguous starting from 0. + */ void fuse_session_process_buf_int(struct fuse_session *se, - const struct fuse_buf *buf, + struct fuse_bufvec *bufv, struct fuse_chan *ch) { + const struct fuse_buf *buf =3D bufv->buf; struct fuse_in_header *in; const void *inarg; struct fuse_req *req; @@ -2108,7 +2129,7 @@ void fuse_session_process_buf_int(struct fuse_session= *se, =20 inarg =3D (void *)&in[1]; if (in->opcode =3D=3D FUSE_WRITE && se->op.write_buf) { - do_write_buf(req, in->nodeid, inarg, buf); + do_write_buf(req, in->nodeid, inarg, bufv); } else { fuse_ll_ops[in->opcode].func(req, in->nodeid, inarg); } diff --git a/tools/virtiofsd/fuse_virtio.c b/tools/virtiofsd/fuse_virtio.c index 635f87756a..fd588a4829 100644 --- a/tools/virtiofsd/fuse_virtio.c +++ b/tools/virtiofsd/fuse_virtio.c @@ -501,7 +501,8 @@ static void *fv_queue_thread(void *opaque) /* TODO! Endianness of header */ =20 /* TODO: Add checks for fuse_session_exited */ - fuse_session_process_buf_int(se, &fbuf, &ch); + struct fuse_bufvec bufv =3D { .buf[0] =3D fbuf, .count =3D 1 }; + fuse_session_process_buf_int(se, &bufv, &ch); =20 if (!qi->reply_sent) { fuse_log(FUSE_LOG_DEBUG, "%s: elem %d no reply sent\n", --=20 2.24.1