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bh=Kmj8Qu9zk6u8styP1oVh44uMPcepAPf0nIT1VcNsAjw=; b=dqOIudcUTWnIbGXxEwQkUrzsAM08dfaam2mftWSt/+yt0EqTJRruP84RJTT6P8sApZI+K2 3ZCELzalfOWPeuLub0/Z/c1rjQgMDQ1bUEI6S5LtKflSWIMWl0JOeZRQIT9mduh6bf/7Hj ya6RIacldXexFs6AY5KktZ3u64H22C0= X-MC-Unique: yMyevcvJPyKXAjlgBScccQ-1 From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, stefanha@redhat.com, vgoyal@redhat.com, dinechin@redhat.com, virtio-fs@redhat.com Subject: [PATCH v4 4/5] tools/virtiofsd: xattr name mapping examples Date: Fri, 23 Oct 2020 17:58:11 +0100 Message-Id: <20201023165812.36028-5-dgilbert@redhat.com> In-Reply-To: <20201023165812.36028-1-dgilbert@redhat.com> References: <20201023165812.36028-1-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; 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charset="utf-8" From: "Dr. David Alan Gilbert" Add a few examples of xattrmaps to the documentation. Signed-off-by: Dr. David Alan Gilbert Reviewed-by: Stefan Hajnoczi --- docs/tools/virtiofsd.rst | 50 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/docs/tools/virtiofsd.rst b/docs/tools/virtiofsd.rst index 868fa0e97b..4e74690eca 100644 --- a/docs/tools/virtiofsd.rst +++ b/docs/tools/virtiofsd.rst @@ -201,6 +201,56 @@ e.g.: =20 would hide 'security.' xattr's in listxattr from the server. =20 +xattr-mapping Examples +---------------------- + +1) Prefix all attributes with 'user.virtiofs.' + +:: + +-o xattrmap=3D":prefix:all::user.virtiofs.::bad:all:::" + + +This uses two rules, using : as the field separator; +the first rule prefixes and strips 'user.virtiofs.', +the second rule hides any non-prefixed attributes that +the host set. + +2) Prefix 'trusted.' attributes, allow others through + +:: + + "/prefix/all/trusted./user.virtiofs./ + /bad/server//trusted./ + /bad/client/user.virtiofs.// + /ok/all///" + + +Here there are four rules, using / as the field +separator, and also demonstrating that new lines can +be included between rules. +The first rule is the prefixing of 'trusted.' and +stripping of 'user.virtiofs.'. +The second rule hides unprefixed 'trusted.' attributes +on the host. +The third rule stops a guest from explicitly setting +the 'user.viritofs.' path directly. +Finally, the fourth rule lets all remaining attributes +through. + +3) Hide 'security.' attributes, and allow everything else + +:: + + "/bad/all/security./security./ + /ok/all///' + +The first rule combines what could be separate client and server +rules into a single 'all' rule, matching 'security.' in either +client arguments or lists returned from the host. This stops +the client seeing any 'security.' attributes on the server and +stops it setting any. + Examples -------- =20 --=20 2.28.0