From owner-freebsd-current Tue Feb 3 16:40:58 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id QAA06979 for current-outgoing; Tue, 3 Feb 1998 16:40:58 -0800 (PST) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from alpo.whistle.com (alpo.whistle.com [207.76.204.38]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id QAA06938 for ; Tue, 3 Feb 1998 16:40:54 -0800 (PST) (envelope-from julian@whistle.com) Received: (from daemon@localhost) by alpo.whistle.com (8.8.5/8.8.5) id QAA26229; Tue, 3 Feb 1998 16:34:17 -0800 (PST) Received: from UNKNOWN(), claiming to be "current1.whistle.com" via SMTP by alpo.whistle.com, id smtpd026227; Tue Feb 3 16:34:16 1998 Message-ID: <34D7B6B0.31DFF4F5@whistle.com> Date: Tue, 03 Feb 1998 16:30:41 -0800 From: Julian Elischer Organization: Whistle Communications X-Mailer: Mozilla 3.0Gold (X11; I; FreeBSD 2.2.5-RELEASE i386) MIME-Version: 1.0 To: mckusick@mckusick.com, current@FreeBSD.ORG Subject: sb being written to r/o disks. Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG X-To-Unsubscribe: mail to majordomo@FreeBSD.org "unsubscribe current" hmmmm it's amazing what new debugging info brings to light! I noticed this with the mount from the soft-updates integration. notice the two extra fields in 'mount'. # mount /dev/wd0e on / (local, read-only, writes: sync 4 async 0) /dev/wd0h on /data (local, softdep, writes: sync 2 async 0) /dev/wd0g on /var (local, writes: sync 2 async 0) procfs on /proc (local, writes: sync 0 async 0) something is doing syncronous writes to a r/o FS.. who? that's easy.. # mount -u -ordonly / Breakpoint at _mount: pushl %ebp db> b bwrite db> c Breakpoint at _bwrite: pushl %ebp db> tr _bwrite(f245ccf4,0) at _bwrite _ffs_sbupdate(f045f200,1) at _ffs_sbupdate+0xb0 _ffs_mount(f045fc00,efbfd268,efbfd1cc,f3666eb8,f364e740) at _ffs_mount+0x1e5 _mount(f364e740,f3666f94,0,efbfd268,1201) at _mount+0x416 _syscall(27,27,1201,efbfd268,efbfd238) at _syscall+0x187 _Xsyscall() at _Xsyscall+0x35 --- syscall 0x15, eip = 0x6a95, esp = 0xefbfd188, ebp = 0xefbfd238 --- db> apparently _ffs_sbupdate() doesn't know to check if the fs is readonly.. julian