From owner-svn-src-all@FreeBSD.ORG Fri Mar 15 11:16:13 2013 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id 859F3A76; Fri, 15 Mar 2013 11:16:13 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) by mx1.freebsd.org (Postfix) with ESMTP id 5F9167C1; Fri, 15 Mar 2013 11:16:13 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.6/8.14.6) with ESMTP id r2FBGD3Y086479; Fri, 15 Mar 2013 11:16:13 GMT (envelope-from kib@svn.freebsd.org) Received: (from kib@localhost) by svn.freebsd.org (8.14.6/8.14.5/Submit) id r2FBGCRC086477; Fri, 15 Mar 2013 11:16:12 GMT (envelope-from kib@svn.freebsd.org) Message-Id: <201303151116.r2FBGCRC086477@svn.freebsd.org> From: Konstantin Belousov Date: Fri, 15 Mar 2013 11:16:12 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r248319 - in head/sys: kern sys X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 15 Mar 2013 11:16:13 -0000 Author: kib Date: Fri Mar 15 11:16:12 2013 New Revision: 248319 URL: http://svnweb.freebsd.org/changeset/base/248319 Log: Implement the helper function vn_io_fault_pgmove(), intended to use by the filesystem VOP_READ() and VOP_WRITE() implementations in the same way as vn_io_fault_uiomove() over the unmapped buffers. Helper provides the convenient wrapper over the pmap_copy_pages() for struct uio consumers, taking care of the TDP_UIOHELD situations. Sponsored by: The FreeBSD Foundation Tested by: pho MFC after: 2 weeks Modified: head/sys/kern/vfs_vnops.c head/sys/sys/vnode.h Modified: head/sys/kern/vfs_vnops.c ============================================================================== --- head/sys/kern/vfs_vnops.c Fri Mar 15 10:21:18 2013 (r248318) +++ head/sys/kern/vfs_vnops.c Fri Mar 15 11:16:12 2013 (r248319) @@ -1122,6 +1122,45 @@ vn_io_fault_uiomove(char *data, int xfer return (error); } +int +vn_io_fault_pgmove(vm_page_t ma[], vm_offset_t offset, int xfersize, + struct uio *uio) +{ + struct thread *td; + vm_offset_t iov_base; + int cnt, pgadv; + + td = curthread; + if ((td->td_pflags & TDP_UIOHELD) == 0 || + uio->uio_segflg != UIO_USERSPACE) + return (uiomove_fromphys(ma, offset, xfersize, uio)); + + KASSERT(uio->uio_iovcnt == 1, ("uio_iovcnt %d", uio->uio_iovcnt)); + cnt = xfersize > uio->uio_resid ? uio->uio_resid : xfersize; + iov_base = (vm_offset_t)uio->uio_iov->iov_base; + switch (uio->uio_rw) { + case UIO_WRITE: + pmap_copy_pages(td->td_ma, iov_base & PAGE_MASK, ma, + offset, cnt); + break; + case UIO_READ: + pmap_copy_pages(ma, offset, td->td_ma, iov_base & PAGE_MASK, + cnt); + break; + } + pgadv = ((iov_base + cnt) >> PAGE_SHIFT) - (iov_base >> PAGE_SHIFT); + td->td_ma += pgadv; + KASSERT(td->td_ma_cnt >= pgadv, ("consumed pages %d %d", td->td_ma_cnt, + pgadv)); + td->td_ma_cnt -= pgadv; + uio->uio_iov->iov_base = (char *)(iov_base + cnt); + uio->uio_iov->iov_len -= cnt; + uio->uio_resid -= cnt; + uio->uio_offset += cnt; + return (0); +} + + /* * File table truncate routine. */ Modified: head/sys/sys/vnode.h ============================================================================== --- head/sys/sys/vnode.h Fri Mar 15 10:21:18 2013 (r248318) +++ head/sys/sys/vnode.h Fri Mar 15 11:16:12 2013 (r248319) @@ -693,6 +693,8 @@ int vn_vget_ino(struct vnode *vp, ino_t struct vnode **rvp); int vn_io_fault_uiomove(char *data, int xfersize, struct uio *uio); +int vn_io_fault_pgmove(vm_page_t ma[], vm_offset_t offset, int xfersize, + struct uio *uio); #define vn_rangelock_unlock(vp, cookie) \ rangelock_unlock(&(vp)->v_rl, (cookie), VI_MTX(vp))