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Old 07-12-2005, 03:07 PM   #1
LQ Newbie
Registered: Jul 2005
Location: Barcelona, Spain
Distribution: Slackware 10.1
Posts: 18

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ufs write in Kernels 2.6.x versus 2.4.x

I have been using the feature of mounting ufs filesystems RW (with the option ufstype=44bsd) for much time along in Kernels 2.4.x without problems.

But now, that Kernels 2.6.x offer additionally the new option ufstype=ufs2 (RO at the moment), I cannot anymore succeed in writing on the old ufs filesystem (ufstype=44bsd) that was so succesfull with the old Kernel 2.4.x (on spite of the warning of dangerous in the documentation).

With Kernel and with the option ufstype=44bsd I am only able to read-write single files in the / directory. Nothing to do beyond any other directory.

Is this a known issue of the new Linux Kernels 2.6.x?

There is something wrong with UFS1 in FreeBSD 5.x?
Old 07-15-2005, 05:52 AM   #2
Michael Johnson
Registered: Jul 2005
Location: Wagga Wagga, Australia
Posts: 262

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The kernel documentation shows this. You may have found a bug.


mount -t ufs -o ufstype=type_of_ufs device dir


UFS is a file system widely used in different operating systems.
The problem are differences among implementations. Features of
some implementations are undocumented, so its hard to recognize
type of ufs automatically. That's why user must specify type of
ufs manually by mount option ufstype. Possible values are:

old old format of ufs
default value, supported as read-only

44bsd used in FreeBSD, NetBSD, OpenBSD
supported as read-write

ufs2 used in FreeBSD 5.x
supported as read-only

5xbsd synonym for ufs2

sun used in SunOS (Solaris)
supported as read-write

sunx86 used in SunOS for Intel (Solarisx86)
supported as read-write

hp used in HP-UX
supported as read-only

used in NextStep
supported as read-only

used for NextStep CDROMs (block_size == 2048)
supported as read-only

used in OpenStep
supported as read-only


There is still bug in reallocation of fragment, in file fs/ufs/balloc.c,
line 364. But it seems working on current buffer cache configuration.


Any ufs bug report you can send to (do not send
partition tables bug reports.)


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