Re: kern/51740: mount -o discard considered harmfull

[Martin Husemann <martin%duskware.de@localhost>]

The following reply was made to PR kern/51740; it has been noted by GNATS.

From: Martin Husemann <martin%duskware.de@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: kern/51740: mount -o discard considered harmfull
Date: Mon, 26 Dec 2016 16:14:38 +0100

 Interesting - I was creating a FFSv1 file system. With newfs -O2 I still get
 the same discard failures, but not the file system corruption. The same
 happens if I do not use "async" (wd_trim errors, but no corruption)
 
 Original file system header:
 
 file system: /dev/rdk1
 format  FFSv1
 endian  big-endian
 magic   11954           time    Mon Dec 26 16:11:33 2016
 superblock location     8192    id      [ 58613325 138cb525 ]
 cylgrp  dynamic inodes  4.4BSD  sblock  FFSv2   fslevel 4
 nbfree  6972668 ndir    1       nifree  13989885        nffree  18
 ncg     297     size    56223309        blocks  55781363
 bsize   32768   shift   15      mask    0xffff8000
 fsize   4096    shift   12      mask    0xfffff000
 frag    8       shift   3       fsbtodb 3
 bpg     23664   fpg     189312  ipg     47104
 minfree 5%      optim   time    maxcontig 2     maxbpg  8192
 symlinklen 60   contigsumsize 2
 maxfilesize 0x004002001005ffff
 nindir  8192    inopb   256
 avgfilesize 16384       avgfpdir 64
 sblkno  8       cblkno  16      iblkno  24      dblkno  1496
 sbsize  4096    cgsize  32768
 csaddr  1496    cssize  8192
 cgrotor 0       fmod    0       ronly   0       clean   0x01
 wapbl version 0x0       location 0      flags 0x0
 wapbl loc0 0    loc1 0  loc2 0  loc3 0
 
 
 Martin