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bh=+viPE2GJ9eEbW+GOrQDDEYes7MrDZKw/MISp+dVDbpo=; b=WvzTNGEp07PmOiIRIoThDAhpiiAYIFRqx0P35Zc3KRR1Ag52kzpxfLR3kB6CDM/rLMSxpO NL7P5Wdh4kTYXUTf5J9Ge4kslI+NvZAEfqkcp/HX5k3wgHGQwku3icLa/yDdBrL4D0a7/L Jle+4AwVGWkPbl0mFXuRcLMEmLe9XdI= X-MC-Unique: bmLTLqWLPgujBaExUbenQw-1 From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, vgoyal@redhat.com, stefanha@redhat.com, groug@kaod.org Subject: [PATCH v3 23/26] DAX:virtiofsd: implement FUSE_INIT map_alignment field Date: Wed, 28 Apr 2021 12:00:57 +0100 Message-Id: <20210428110100.27757-24-dgilbert@redhat.com> In-Reply-To: <20210428110100.27757-1-dgilbert@redhat.com> References: <20210428110100.27757-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dgilbert@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=216.205.24.124; envelope-from=dgilbert@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.22, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: virtio-fs@redhat.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: Stefan Hajnoczi Communicate the host page size to the FUSE client so that FUSE_SETUPMAPPING/FUSE_REMOVEMAPPING requests are aware of our alignment constraints. Signed-off-by: Stefan Hajnoczi --- tools/virtiofsd/fuse_lowlevel.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/tools/virtiofsd/fuse_lowlevel.c b/tools/virtiofsd/fuse_lowleve= l.c index 6930574aaf..50fc5c8d5a 100644 --- a/tools/virtiofsd/fuse_lowlevel.c +++ b/tools/virtiofsd/fuse_lowlevel.c @@ -10,6 +10,7 @@ */ =20 #include "qemu/osdep.h" +#include "qemu/host-utils.h" #include "fuse_i.h" #include "standard-headers/linux/fuse.h" #include "fuse_misc.h" @@ -2194,6 +2195,12 @@ static void do_init(fuse_req_t req, fuse_ino_t nodei= d, outarg.max_background =3D se->conn.max_background; outarg.congestion_threshold =3D se->conn.congestion_threshold; outarg.time_gran =3D se->conn.time_gran; + if (arg->flags & FUSE_MAP_ALIGNMENT) { + outarg.flags |=3D FUSE_MAP_ALIGNMENT; + + /* This constraint comes from mmap(2) and munmap(2) */ + outarg.map_alignment =3D ctz64(sysconf(_SC_PAGE_SIZE)); + } =20 if (se->conn.want & FUSE_CAP_HANDLE_KILLPRIV_V2) { outarg.flags |=3D FUSE_HANDLE_KILLPRIV_V2; @@ -2207,6 +2214,7 @@ static void do_init(fuse_req_t req, fuse_ino_t nodeid, fuse_log(FUSE_LOG_DEBUG, " congestion_threshold=3D%i\n", outarg.congestion_threshold); fuse_log(FUSE_LOG_DEBUG, " time_gran=3D%u\n", outarg.time_gran); + fuse_log(FUSE_LOG_DEBUG, " map_alignment=3D%u\n", outarg.map_alignme= nt); =20 send_reply_ok(req, &outarg, outargsize); } --=20 2.31.1