From owner-svn-src-all@FreeBSD.ORG Sat Apr 3 08:39:00 2010 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id F05D2106566B; Sat, 3 Apr 2010 08:39:00 +0000 (UTC) (envelope-from avg@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c]) by mx1.freebsd.org (Postfix) with ESMTP id E007A8FC12; Sat, 3 Apr 2010 08:39:00 +0000 (UTC) Received: from svn.freebsd.org (localhost [127.0.0.1]) by svn.freebsd.org (8.14.3/8.14.3) with ESMTP id o338d0kt032830; Sat, 3 Apr 2010 08:39:00 GMT (envelope-from avg@svn.freebsd.org) Received: (from avg@localhost) by svn.freebsd.org (8.14.3/8.14.3/Submit) id o338d0VV032828; Sat, 3 Apr 2010 08:39:00 GMT (envelope-from avg@svn.freebsd.org) Message-Id: <201004030839.o338d0VV032828@svn.freebsd.org> From: Andriy Gapon Date: Sat, 3 Apr 2010 08:39:00 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: Subject: svn commit: r206129 - head/sys/kern X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.5 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: Sat, 03 Apr 2010 08:39:01 -0000 Author: avg Date: Sat Apr 3 08:39:00 2010 New Revision: 206129 URL: http://svn.freebsd.org/changeset/base/206129 Log: vn_stat: take into account va_blocksize when setting st_blksize As currently st_blksize is always PAGE_SIZE, it is playing safe to not use any smaller value. For some cases this might not be optimal, but at least nothing should get broken. Generally I don't expect this commit to change much for the following reasons (in case of VREG, VDIR): - application I/O and physical I/O are sufficiently decoupled by filesystem code, buffer cache code, cluster and read-ahead logic - not all applications use st_blksize as a hint, some use f_iosize, some use fixed block sizes I expect writes to the middle of files on ZFS to benefit the most from this change. Silence from: fs@ MFC after: 2 weeks Modified: head/sys/kern/vfs_vnops.c Modified: head/sys/kern/vfs_vnops.c ============================================================================== --- head/sys/kern/vfs_vnops.c Sat Apr 3 08:25:04 2010 (r206128) +++ head/sys/kern/vfs_vnops.c Sat Apr 3 08:39:00 2010 (r206129) @@ -792,11 +792,10 @@ vn_stat(vp, sb, active_cred, file_cred, * "a filesystem-specific preferred I/O block size for this * object. In some filesystem types, this may vary from file * to file" - * Default to PAGE_SIZE after much discussion. - * XXX: min(PAGE_SIZE, vp->v_bufobj.bo_bsize) may be more correct. + * Use miminum/default of PAGE_SIZE (e.g. for VCHR). */ - sb->st_blksize = PAGE_SIZE; + sb->st_blksize = max(PAGE_SIZE, vap->va_blocksize); sb->st_flags = vap->va_flags; if (priv_check(td, PRIV_VFS_GENERATION))