Date: Fri, 27 Feb 1998 12:48:06 +0900 (JST) From: Michael Hancock <michaelh@cet.co.jp> To: freebsd-current@FreeBSD.ORG Subject: VFS_VRELE - WILLRELE must die Message-ID: <Pine.SV4.3.95.980227124118.2308A-101000@parkplace.cet.co.jp>
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This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. Send mail to mime@docserver.cac.washington.edu for more info. ---559023410-1804928587-888551286=:2308 Content-Type: TEXT/PLAIN; charset=US-ASCII Implement the complement to all vpp generating ops called in the vfs_vn layer. Some people call this making it reflexive. The 4K tar ball is attached, but I can upload this somewhere if you're mailer doesn't do MIME. Regards, Mike Hancock ------------------ The intent is to get rid of WILLRELE in vnode_if.src by making a complement to all ops that return a vpp, VFS_VRELE. This is initially only for file systems that implement the following ops that do a WILLRELE: vop_create, vop_whiteout, vop_mknod, vop_remove, vop_link, vop_rename, vop_mkdir, vop_rmdir, vop_symlink This is initial DNA that doesn't do anything yet. VFS_VRELE is implemented but not called. In the next phase vop implementations vrele and the vrele part of vput will be moved to the top layer vfs_vnops and made visible to all layers. This will only be done for vnode arguments that are released by the various fs vop implementations. Unlocking will still be done in the per fs layer but the refcount decrement will be initiated at the top because it doesn't hurt to hold a vnode reference a little longer. VFS_VRELE implementations were made for the following file systems: ffs_vfsops.c mfs_vfsops.c nfs_vfsops.c msdosfs_vfsops.c devfs_vfsops.c nullfs_vfsops.c union_vfsops.c umapfs_vfsops.c The following implementations just do ENOTSUPP because they don't implement any of the WILLRELE vops: procfs_procfs.c cd9660_vfsops.c The following code snippet from vn_open is an example of how it will be added later. vop_create releases the directory vnode, but we will change it so that it is initiated in vn_open after the VOP_CREATE returns. Now... if (error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd, vap)) return (error); Later... error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd, vap); VFS_VRELE(ndp->ni_dvp->vmount, ndp->ni_dvp); if (error) return (error); ---559023410-1804928587-888551286=:2308 Content-Type: APPLICATION/octet-stream; name="vfs_vrele.tgz" Content-Transfer-Encoding: BASE64 Content-ID: <Pine.SV4.3.95.980227124806.2308B@parkplace.cet.co.jp> Content-Description: H4sIAJUq9jQAA+1cbW/bOBLuV+tXELvAnZ04sd7tuLii2TbdLZAmRuNme8AC hmpJta62JEiy09xi//vNDCmJku1N0zZ2r9W0sS2KmhlyqHlmSEorP52sEm/u 9R49GDFT7VsWe8SQVPHdF9+ikNlm3zJ13dbgt6bahvWIWQ+nUknLNHMSxh4l UZT9Xb13QbgLdXZNq8L+U/fEttVjN/D9ryxDU1XbNLfaX9c1s7C/0TfA/rql mo+Y+pX12Eg/uP1fhq73cci48ScwGqI4PZ4q//pyUl4/u2J+MPeGrLdMk950 lfbSZNpLb9NekEZ+KkZcrya7u1ISL0sCbxWE71kCX2kQhUw7NgwFByc7WrKj BA/XtD46OqqXtbSTk35P03u6xnRtaKpDVW8Rr8PDw02VBz0VKveZqg/1wdCw lKdP2VHf6NrsED777OlThcGQyYIpC8Is55DehlM2mYza7TRLltOMLaIlnD3o 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