From owner-svn-src-all@FreeBSD.ORG Sun May 4 00:43:01 2014 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id A46F5D48; Sun, 4 May 2014 00:43:01 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 76F641849; Sun, 4 May 2014 00:43:01 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.8/8.14.8) with ESMTP id s440h1po069784; Sun, 4 May 2014 00:43:01 GMT (envelope-from bryanv@svn.freebsd.org) Received: (from bryanv@localhost) by svn.freebsd.org (8.14.8/8.14.8/Submit) id s440h1rx069777; Sun, 4 May 2014 00:43:01 GMT (envelope-from bryanv@svn.freebsd.org) Message-Id: <201405040043.s440h1rx069777@svn.freebsd.org> From: Bryan Venteicher Date: Sun, 4 May 2014 00:43:01 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r265299 - in stable/9/sys: kern sys X-SVN-Group: stable-9 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: 2.1.17 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: Sun, 04 May 2014 00:43:01 -0000 Author: bryanv Date: Sun May 4 00:43:00 2014 New Revision: 265299 URL: http://svnweb.freebsd.org/changeset/base/265299 Log: MFC r260581: - Add sglist_append_bio(9) to append a struct bio's data to a sglist Modified: stable/9/sys/kern/subr_sglist.c stable/9/sys/sys/sglist.h Directory Properties: stable/9/sys/ (props changed) stable/9/sys/sys/ (props changed) Modified: stable/9/sys/kern/subr_sglist.c ============================================================================== --- stable/9/sys/kern/subr_sglist.c Sun May 4 00:14:49 2014 (r265298) +++ stable/9/sys/kern/subr_sglist.c Sun May 4 00:43:00 2014 (r265299) @@ -33,6 +33,7 @@ __FBSDID("$FreeBSD$"); #include #include +#include #include #include #include @@ -40,6 +41,7 @@ __FBSDID("$FreeBSD$"); #include #include +#include #include #include @@ -239,6 +241,44 @@ sglist_append(struct sglist *sg, void *b } /* + * Append the segments to describe a bio's data to a scatter/gather list. + * If there are insufficient segments, then this fails with EFBIG. + * + * NOTE: This function expects bio_bcount to be initialized. + */ +int +sglist_append_bio(struct sglist *sg, struct bio *bp) +{ + struct sgsave save; + vm_paddr_t paddr; + size_t len, tlen; + int error, i, ma_offs; + + if ((bp->bio_flags & BIO_UNMAPPED) == 0) { + error = sglist_append(sg, bp->bio_data, bp->bio_bcount); + return (error); + } + + if (sg->sg_maxseg == 0) + return (EINVAL); + + SGLIST_SAVE(sg, save); + tlen = bp->bio_bcount; + ma_offs = bp->bio_ma_offset; + for (i = 0; tlen > 0; i++, tlen -= len) { + len = min(PAGE_SIZE - ma_offs, tlen); + paddr = VM_PAGE_TO_PHYS(bp->bio_ma[i]) + ma_offs; + error = sglist_append_phys(sg, paddr, len); + if (error) { + SGLIST_RESTORE(sg, save); + return (error); + } + ma_offs = 0; + } + return (0); +} + +/* * Append a single physical address range to a scatter/gather list. * If there are insufficient segments, then this fails with EFBIG. */ Modified: stable/9/sys/sys/sglist.h ============================================================================== --- stable/9/sys/sys/sglist.h Sun May 4 00:14:49 2014 (r265298) +++ stable/9/sys/sys/sglist.h Sun May 4 00:43:00 2014 (r265299) @@ -53,6 +53,7 @@ struct sglist { u_short sg_maxseg; }; +struct bio; struct mbuf; struct uio; @@ -83,6 +84,7 @@ sglist_hold(struct sglist *sg) struct sglist *sglist_alloc(int nsegs, int mflags); int sglist_append(struct sglist *sg, void *buf, size_t len); +int sglist_append_bio(struct sglist *sg, struct bio *bp); int sglist_append_mbuf(struct sglist *sg, struct mbuf *m0); int sglist_append_phys(struct sglist *sg, vm_paddr_t paddr, size_t len);