NetBSD Problem Report #44204

From riz@netbsd6.localdomain  Wed Dec  8 07:35:06 2010
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Date: Tue,  7 Dec 2010 22:17:17 -0800 (PST)
From: riz@netbsd.org
Reply-To: riz@netbsd.org
To: gnats-bugs@gnats.NetBSD.org
Subject: resize_ffs(8) problems shrinking 64K blocksize ffsv1 < 1cyl
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>Number:         44204
>Category:       bin
>Synopsis:       resize_ffs(8) problems shrinking 64K blocksize ffsv1 < 1cyl
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    riz
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Dec 08 07:40:00 +0000 2010
>Last-Modified:  Wed Dec 08 16:45:01 +0000 2010
>Originator:     Jeff Rizzo <riz@NetBSD.org>
>Release:        NetBSD 5.99.41
>Organization:

>Environment:


System: NetBSD netbsd6 5.99.41 NetBSD 5.99.41 (GENERIC) #0: Sun Dec 5 19:35:40 PST 2010 riz@netbsd6:/home/riz/obj/sys/arch/amd64/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64
>Description:
	When shrinking a file system with 64K blocksize less than a whole
cylinder group, the file system is marked clean but is actually not, as
evidenced by a run through fsck_ffs. Dropping a whole cg or more seems
to work OK.
>How-To-Repeat:

- Create a file system with 64K blocks
- use resize_ffs to shrink it less than one whole cg
- run fsck_ffs -f on it

netbsd6:riz  /usr/src/sbin/resize_ffs> newfs -O1 -s 65536 -f 8192 -s 131072 -F /tmp/fs
/tmp/fs: 64.0MB (131072 sectors) block size 65536, fragment size 8192
	using 3 cylinder groups of 21.38MB, 342 blks, 512 inodes.
super-block backups (for fsck_ffs -b #) at:
128, 43904, 87680,
netbsd6:riz  /usr/src/sbin/resize_ffs> resize_ffs -y -s 98304 /tmp/fs
netbsd6:riz  /usr/src/sbin/resize_ffs> fsck_ffs -F -f /tmp/fs
** /tmp/fs
** File system is already clean
** Last Mounted on 
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
FREE BLK COUNT(S) WRONG IN SUPERBLK
SALVAGE? [yn] n

SUMMARY INFORMATION BAD
SALVAGE? [yn] n

BLK(S) MISSING IN BIT MAPS
SALVAGE? [yn] n

1 files, 1 used, 6046 free (14 frags, 754 blocks, 0.2% fragmentation)

***** UNRESOLVED INCONSISTENCIES REMAIN *****


>Fix:
	None given.  There is some code to deal with partial cgs;  
check there first.

>Release-Note:

>Audit-Trail:

Responsible-Changed-From-To: bin-bug-people->riz
Responsible-Changed-By: jnemeth@NetBSD.org
Responsible-Changed-When: Wed, 08 Dec 2010 08:17:33 +0000
Responsible-Changed-Why:
riz requested that the resize_ffs PRs be assigned to him


From: Jeff Rizzo <riz@netbsd.org>
To: gnats-bugs@NetBSD.org
Cc: 
Subject: Re: bin/44204 (resize_ffs(8) problems shrinking 64K blocksize ffsv1
 < 1cyl)
Date: Wed, 08 Dec 2010 08:43:59 -0800

 Further testing indicates both shrinking and growing by less than 1cyl 
 are problematic.

>Unformatted:

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