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Tue, 21 Jan 2020 12:32:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1579609956; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=2dbUAWAejYnRc42sWcPyVmlxq/L9lJHFi3bByYfEubM=; b=QLnAGf18jTiiZyHOl6GMceaZ0bq5rh876jfiiXnjo1/YfCz4j7jMTViVoI7dbLrngcNJQR 37oZZeiusPBIE99X5UxA3I8SAcPQ8S1xHls/iTiAZaDSAZ+QaTOIawoZJE6KNErS1Be7yM Ee6Rde6qSe2yxMRCuT64xrk9OCiFp9o= From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, stefanha@redhat.com, vgoyal@redhat.com, berrange@redhat.com, slp@redhat.com, philmd@redhat.com Subject: [PATCH v2 100/109] virtiofsd: add definition of fuse_buf_writev() Date: Tue, 21 Jan 2020 12:24:24 +0000 Message-Id: <20200121122433.50803-101-dgilbert@redhat.com> In-Reply-To: <20200121122433.50803-1-dgilbert@redhat.com> References: <20200121122433.50803-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-MC-Unique: tDJ7Rh4OP76mz5gzdkyFdg-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] [fuzzy] X-Received-From: 205.139.110.120 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: , Cc: m.mizuma@jp.fujitsu.com, misono.tomohiro@jp.fujitsu.com 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: piaojun Define fuse_buf_writev() which use pwritev and writev to improve io bandwidth. Especially, the src bufs with 0 size should be skipped as their mems are not *block_size* aligned which will cause writev failed in direct io mode. Signed-off-by: Jun Piao Suggested-by: Stefan Hajnoczi Reviewed-by: Daniel P. Berrang=C3=A9 --- tools/virtiofsd/buffer.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/tools/virtiofsd/buffer.c b/tools/virtiofsd/buffer.c index 918e0f41e0..70980550d2 100644 --- a/tools/virtiofsd/buffer.c +++ b/tools/virtiofsd/buffer.c @@ -13,6 +13,7 @@ #include "fuse_lowlevel.h" #include #include +#include #include #include =20 @@ -32,6 +33,43 @@ size_t fuse_buf_size(const struct fuse_bufvec *bufv) return size; } =20 +__attribute__((unused)) +static ssize_t fuse_buf_writev(struct fuse_buf *out_buf, + struct fuse_bufvec *in_buf) +{ + ssize_t res, i, j; + size_t iovcnt =3D in_buf->count; + struct iovec *iov; + int fd =3D out_buf->fd; + + iov =3D calloc(iovcnt, sizeof(struct iovec)); + if (!iov) { + return -ENOMEM; + } + + for (i =3D 0, j =3D 0; i < iovcnt; i++) { + /* Skip the buf with 0 size */ + if (in_buf->buf[i].size) { + iov[j].iov_base =3D in_buf->buf[i].mem; + iov[j].iov_len =3D in_buf->buf[i].size; + j++; + } + } + + if (out_buf->flags & FUSE_BUF_FD_SEEK) { + res =3D pwritev(fd, iov, iovcnt, out_buf->pos); + } else { + res =3D writev(fd, iov, iovcnt); + } + + if (res =3D=3D -1) { + res =3D -errno; + } + + free(iov); + return res; +} + static size_t min_size(size_t s1, size_t s2) { return s1 < s2 ? s1 : s2; --=20 2.24.1