Go Back   DaemonForums > DaemonForums.org > News

News News regarding BSD and related.

Thread Tools Display Modes
  #1   (View Single Post)  
Old 1 Week Ago
e1-531g e1-531g is offline
VPN Cryptographer
Join Date: Mar 2014
Posts: 375
Default Sync disks in a better way

News/call for testing from tech: 2017-12-01 20:48
Sync disks in a better way
Originally Posted by Theo de Raadt
For more than a decade I have pointed out vfs_shutdown does a terrible
job, but noone took the bait to fix it. It uses proc0, does spl0, and
a loop which makes it clear the operation may fail... and we've see
evidence the loop fails. It really cannot gaurantee the filesystem is

bluhm recently pointed out a problem where the failure could cause
entry into ddb (long story removed), so I rolled up my sleeves.
kettenis suggested rather than unmounting filesystems we could try
downgrading them to read-only. That exposed a deep-down copyin in
each filesystem's VOP handling function for mounts, vfs_init
infrastructure needed to some love.

After all that work, it turns out writeable vnodes on a readonly
filesystem can cause the change to readonly to fail, so we need to
invalidate such vnodes with a hammer.

This seems to be working. I'd like to know of anyone sees failures,
otherwise in few days I'll test this in snapshots. (Besides building
a new kernel, you want to make includes, build a new sysctl binary,
and install that).
Signature: Furthermore, I consider that systemd must be destroyed.
Based on Latin oratorical phrase
Reply With Quote

ffs, openbsd filesystem

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
NTP 4.2.8 loses sync, system time far out MatthiasKoch OpenBSD General 25 21st November 2016 05:22 PM
ext2fs -o sync soderlund OpenBSD General 7 27th November 2014 06:18 AM
How to know if the system is in sync sepuku OpenBSD Installation and Upgrading 29 8th September 2011 12:24 PM
Best Way to sync web sites roundkat OpenBSD General 2 14th September 2008 01:48 PM
How to sync files over ftp graudeejs FreeBSD General 4 4th August 2008 10:18 PM

All times are GMT. The time now is 07:43 PM.

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Content copyright © 2007-2010, the authors
Daemon image copyright ©1988, Marshall Kirk McKusick