post-halloween 0.2

post-halloween 0.2

[Dave Jones]

I updated the list of various things that wannabe testers might hit.
If theres something I missed let me know, and I'll get it right
next time round..

		Dave




                     The post-halloween document. v0.2
                        (aka, 2.5 - what to expect)

                    Dave Jones <davej@codemonkey.org.uk>

This document explains some of the new functionality to be found in the 2.5
Linux kernel, some pitfalls you may encounter, and also points out some new
features which could really use testing.
Note, that "contact foo@bar.com" below also implies that you should also
cc: linux-kernel@vger.kernel.org.

Latest version of this document can always be found at
http://www.codemonkey.org.uk/post-halloween-2.5.txt


Regressions:
~~~~~~~~~~~~
(Things not expected to work just yet)
- The hptraid/promise RAID drivers are currently non functional.
- Various SCSI drivers still need work, and don't even compile.
- software suspend is still in development, and in need of more work.
  It is unlikely to work as expected currently.
- Some filesystems still need work (Coda, Intermezzo).

Deprecated features:
~~~~~~~~~~~~~~~~~~~~
- khttpd is gone.
- Older Direct Rendering Manager (DRM) support (For XFree86 4.0)
  has been removed. Upgrade to XFree86 4.1.0 or higher.


IO subsystem.
~~~~~~~~~~~~~
You should notice considerable throughput improvements over 2.4 due
to much reworking of the block and the memory management layers.
Report any regressions in this area to Jens Axboe <axboe@suse.de>
and Andrew Morton <akpm@digeo.com>.

Assorted changes throughout the block layer meant various block
device drivers had a large scale cleanup whilst being updated to
newer APIs.


Kernel preemption.
~~~~~~~~~~~~~~~~~~
The much talked about preemption patches made it into 2.5.
With this included you should notice much lower latencies especially
in demanding multimedia applications. 
Note, there are still cases where preemption must be temporarily disabled
where we do not.  If you get "xxx exited with preempt count=n" messages
in syslog, don't panic, these are non fatal, but are somewhat unclean.
Report such cases (and any other preemption related problems) to
rml@tech9.net


O(1) Scheduling improvements.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Another much talked about feature. Ingo Molnar reworked the process
scheduler to use an O(1) algorithm.  In operation, you should notice
no changes with low loads, and increased scalability with large numbers
of processes, especially on large SMP systems. Regressions to mingo@redhat.com


Input layer
~~~~~~~~~~~
Possibly the most visible change to the end user. If misconfigured,
you'll find that your keyboard/mouse/other input device will no longer work.
2.5 offers a much more flexable interface to devices such as keyboards.
The downside is more confusing options.
In the "Input device support" menu, be sure to enable at least the following.

                    --- Input I/O drivers
                    < > Serial i/o support
                    < >   i8042 PC Keyboard controller
                    [ ] Keyboards
                    [ ] Mice

(Also choose the relevant keyboard/mouse from the list)

If you find your keyboard/mouse still don't work, edit the file
drivers/input/serio/i8042.c, and replace the #undef DEBUG
with a #define DEBUG

When you boot, you should now see a lot more debugging information.
Forward this information to Vojtech Pavlik <vojtech@suse.cz>

If you use a KVM switcher, and experience problems, booting
with the boot time argument 'psmouse_noext' should fix your
problems.


PnP layer
~~~~~~~~~
Support for plug and play devices such as early ISAPNP cards has
improved a lot in the 2.5 kernel. You should no longer need to
futz with userspace tools to configure IRQ's and the likes.
Report any regressions in plug & play functionality to
Adam Belay <ambx1@neo.rr.com>


ALSA
~~~~
The advanced linux sound architecture got merged into 2.5.
This offers considerably improved functionality over the
older OSS drivers, but requires new userspace tools.
Several distros have shipped ALSA for some time, so you
may already have the necessary tools. If not, you can find them
at http://www.alsa-project.org/
(Note that the OSS drivers are also still functional, and
 still present)


procps
~~~~~~
The 2.5 /proc filesystems exports more statistics, which confuse
older versions of procps. Rik van Riel and Robert Love have
been maintaining a forked version of procps during the 2.5 cycle,
which you can find at http://tech9.net/rml/procps/



Framebuffer layer
~~~~~~~~~~~~~~~~~
James Simmons has reworked the framebuffer/console layer
considerably during 2.5. Support for some cards is still
lagging a little, but it should be functionally no different
than previous incarnations.


IDE
~~~
The IDE code was subject to much criticism in early 2.5.x, which
put off a lot of people from testing. This work was then subsequently
dropped, and reverted back to a 2.4.18 IDE status.
(Since then additional work has occured, but not to the extent
 of the first cleanup attempts).
Additional work on the ATA code is happening in 2.4-ac, and pending
merging to 2.5


IDE TCQ
~~~~~~~
Tagged command queueing for IDE devices has been included.
Not all devices may like this, so handle with care.
If you didn't choose the "TCQ on by default" option,
you can enable it by using the command

echo "using_tcq:32" > /proc/ide/hdX/settings
(replacing 32 with 0 disables TCQ again).
Report success/failure stories to Jens Axboe <axboe@suse.de> with
inclusion of hdparm -i /dev/hdX


v4l2
~~~~
The video4linux API finally got its long awaited cleanup.
xawtv, bttv and most other existing v4l tools are also compatable
with the new v4l2 layer. You should notice no loss in functionality.
http://bytesex.org/v4l/


Quota reworking
~~~~~~~~~~~~~~~
The new quota system needs new tools.
ftp://atrey.karlin.mff.cuni.cz/pub/local/jack/quota/utils/alpha/quota-3.05-pre1.tar.gz


CD Recording
~~~~~~~~~~~~
Jens Axboe added the ability to use DMA for writing CDs on
ATAPI devices. Writing CDs should be much faster than it
was in 2.4, and also less prone to buffer underruns and the like.
Updated cdrecord in rpm and tar.gz can be found at
*.kernel.org/pub/linux/kernel/people/axboe/tools/

With the above tools, you also no longer need ide-scsi
in order to use an IDE CD writer.

Ripping audio tracks off of CDs now also uses DMA and should
be notably faster. You can also find an updated cdda2wav
at the same location.

Send good/bad reports of audio extraction with cdda2wav
and burning with cdrecord to Jens Axboe <axboe@suse.de>

More info at http://lwn.net/Articles/13538/ & http://lwn.net/Articles/13160/


Filesystems:
~~~~~~~~~~~~
A number of additional filesystems have made their way into 2.5.
Whilst these have had testing out of tree, the level of testing
after merging is unparalleled. Be wary of trusting data to immature
filesystems.  A number of new features and improvements have also
been made to the existing filesystems from 2.4.

Reports of stress testing with the various tools available would
be beneficial.

NFS
~~~
Support has been added for NFSv4 (server and client), and additionally,
NFS over TCP. Reports of interoperability with other OS's would be useful.

driverfs
~~~~~~~~
In simple terms, the driverfs filesystem is a saner way for
drivers to export their innards than /proc.
This filesystem is always compiled in, and can be mounted
just like another virtual filesystem. No userspace tools
beyond cat and echo are needed.

	mount -t driverfs none /sys

*NB*, at some point the name of this filesystem will be changing to sysfs.
See Documentation/filesystems/sysfs.txt for more info.

XFS
~~~
The SGI XFS filesystem has been merged, and has a number of userspace
features. Users are encouraged to read http://oss.sgi.com/project
for more information.
The various utilties for creating and manipulating XFS volumes can
be found on SGI's ftp server..
ftp://oss.sgi.com/projects/xfs/download/download/cmd_tars/xfsprogs-2.2.2.src.tar.gz

CIFS
~~~~
Support utilities and documentation for the common internet file system (CIFS)
can be found at http://us1.samba.org/samba/Linux_CIFS_client.html

EXT3 Htree support.
~~~~~~~~~~~~~~~~~~~
The ext3 filesystem has gained indexed directory support, which offers
considerable performance gains when used on filesystems with large directories.
In order to use the htree feature, you need at least version 1.29 of e2fsprogs.
Existing filesystems can be converted using the command "tune2fs -O dir_index /dev/hdXXX"
The latest e2fsprogs can be found at http://prdownloads.sourceforge.net/e2fsprogs


Oprofile.
~~~~~~~~~
A system wide performance profiler has been included in 2.5.
The userspace utilities for this are very young, and still being developed.
You can find out more at http://oprofile.sourceforge.net/oprofile-2.5.html


Simple boot flag support.
~~~~~~~~~~~~~~~~~~~~~~~~~
The SBF specification is an x86 BIOS extension that allows improved
system boot speeds. It does this by marking a CMOS field to say
"I booted okay, skip extensive POST next reboot".
Userspace tool is at http://www.codemonkey.org.uk/cruft/sbf-0.3.c
More info on SBF is at http://www.microsoft.com/hwdev/resources/specs/simp_bios.asp


x86 CPU detection.
~~~~~~~~~~~~~~~~~~
The CPU detection code got a pretty hefty shake up. To be certain your
CPU has all relevant workarounds applied, be sure to check that it was
detected correctly. cat /proc/cpuinfo will tell what the kernel thinks it is.
Likewise, the x86 MTRR driver got a considerable makeover.
Any regressions in both should go to mochel@osdl.org


Extra tainting.
~~~~~~~~~~~~~~~
Running certain AMD processors in SMP boxes is out of spec, and will taint
the kernel with the 'S' flag.  Running 2 Athlon XPs for example may seem to
work fine, but may also introduce difficult to pin down bugs.
In time it's likely this tainting will be extended to cover other out of
spec cases.


Power management.
~~~~~~~~~~~~~~~~~
2.5 contains a more up to date snapshot of the ACPI driver. Should
you experience any problems booting, try booting with the argument
"acpi=off" to rule out any ACPI interaction. ACPI has a much more involved
role in bringing the system up in 2.5 than it did in 2.4
The old "acpismp=force" boot option is now obsolete, and will be ignored
due to the old "mini ACPI" parser being removed.


CPU frequency scaling.
~~~~~~~~~~~~~~~~~~~~~~
Certain processors have the facility to scale their voltage/clockspeed.
2.5 introduces an interface to this feature, see Documentation/cpufreq
for more information. This functionality also covers features like
Intel's speedstep, and will be extended in time to cover the Powernow
feature present in mobile Athlons.


Background polling of MCE
~~~~~~~~~~~~~~~~~~~~~~~~~
The machine check handler has been extended so that it regularly polls
for any problems on AMD Athlon systems.  This may result in machine check
exceptions occuring more frequently than they did in 2.4 on out of spec
systems (Overclocking/poor cooling/underated PSU etc..).


LVM2 - DeviceMapper.
~~~~~~~~~~~~~~~~~~~~
The LVM code got a massive overhaul (read as: replacement).
This means new tools are needed to manage the device mapper.
You can get these from ftp://ftp.sistina.com/pub/LVM2/tools/


Debugging options.
~~~~~~~~~~~~~~~~~~
During the stabilising period, it's likely that the debugging options
in the kernel hacking menu will trigger quite a few problems.
Please report any of these problems to linux-kernel@vger.kernel.org
rather than just disabling the relevant CONFIG_ options.

TODO
~~~~
- Reiser4 ?
  http://www.namesys.com/snapshots/2002.10.29/reiser4progs-0.1.0.tar.gz
- ipsec ?
- ebtables
- compilers
  When compiled with a modern gcc (Ie gcc 3.x), 2.5 will use additional
  optimisations that 2.4 didn't. This may shake out compiler bugs that
  2.4 didn't expose. The recommended compiler is still 2.95.3.
- boot time root= parsing changed.
 ramdisks now have ram<n> isntead of rd<n> and cm206 - cm206cd (instead of cm206).


-- 
| Dave Jones.        http://www.codemonkey.org.uk

Re: post-halloween 0.2

[Ian Soboroff]

Dave Jones <davej@codemonkey.org.uk> writes:

> driverfs
> ~~~~~~~~
> [...]
> *NB*, at some point the name of this filesystem will be changing to sysfs.
> See Documentation/filesystems/sysfs.txt for more info.

Probably have to wait until we push the rock up the hill again.

ian

Re: post-halloween 0.2

[Greg KH]

On Wed, Oct 30, 2002 at 01:47:19PM -0500, Ian Soboroff wrote:
> Dave Jones <davej@codemonkey.org.uk> writes:
> 
> > driverfs
> > ~~~~~~~~
> > [...]
> > *NB*, at some point the name of this filesystem will be changing to sysfs.
> > See Documentation/filesystems/sysfs.txt for more info.
> 
> Probably have to wait until we push the rock up the hill again.

What do you mean?  This should happen in the next few kernel releases.

thanks,

greg k-h

Re: post-halloween 0.2

[Ian Soboroff]

Greg KH <greg@kroah.com> writes:

> On Wed, Oct 30, 2002 at 01:47:19PM -0500, Ian Soboroff wrote:
> > Dave Jones <davej@codemonkey.org.uk> writes:
> > 
> > > driverfs
> > > ~~~~~~~~
> > > [...]
> > > *NB*, at some point the name of this filesystem will be changing to sysfs.
> > > See Documentation/filesystems/sysfs.txt for more info.
> > 
> > Probably have to wait until we push the rock up the hill again.
> 
> What do you mean?  This should happen in the next few kernel releases.

sysfs == Sisyphus, a character of Greek mythology doomed by the gods
to roll a boulder up a hill for all time.  When he gets to the top, it
rolls back down.

Kind of like fixing /proc.  <ducks>

ian

Re: post-halloween 0.2

[Greg KH]

On Wed, Oct 30, 2002 at 02:02:31PM -0500, Ian Soboroff wrote:
> Greg KH <greg@kroah.com> writes:
> 
> > On Wed, Oct 30, 2002 at 01:47:19PM -0500, Ian Soboroff wrote:
> > > Dave Jones <davej@codemonkey.org.uk> writes:
> > > 
> > > > driverfs
> > > > ~~~~~~~~
> > > > [...]
> > > > *NB*, at some point the name of this filesystem will be changing to sysfs.
> > > > See Documentation/filesystems/sysfs.txt for more info.
> > > 
> > > Probably have to wait until we push the rock up the hill again.
> > 
> > What do you mean?  This should happen in the next few kernel releases.
> 
> sysfs == Sisyphus, a character of Greek mythology doomed by the gods
> to roll a boulder up a hill for all time.  When he gets to the top, it
> rolls back down.

Doh!

/me goes and digs out his old Mythology books...

> Kind of like fixing /proc.  <ducks>

All too true :)

greg k-h

Re: post-halloween 0.2

[Patrick Mochel]

On 30 Oct 2002, Ian Soboroff wrote:

> Greg KH <greg@kroah.com> writes:
> 
> > On Wed, Oct 30, 2002 at 01:47:19PM -0500, Ian Soboroff wrote:
> > > Dave Jones <davej@codemonkey.org.uk> writes:
> > > 
> > > > driverfs
> > > > ~~~~~~~~
> > > > [...]
> > > > *NB*, at some point the name of this filesystem will be changing to sysfs.
> > > > See Documentation/filesystems/sysfs.txt for more info.
> > > 
> > > Probably have to wait until we push the rock up the hill again.
> > 
> > What do you mean?  This should happen in the next few kernel releases.
> 
> sysfs == Sisyphus, a character of Greek mythology doomed by the gods
> to roll a boulder up a hill for all time.  When he gets to the top, it
> rolls back down.

sysfs != Sisyphus. They are coincidental hominems. 

> Kind of like fixing /proc.  <ducks>

Recall also that (Feature Freeze != Code Freeze). There will be a lot of 
cleanup and conversion happening the next few months, from old school 
driver models to the new driver models, and the population of a sane sysfs 
layout. 

driverfs will hopefully die today. Stay tuned..

	-pat

Re: post-halloween 0.2

[Ian Soboroff]

Patrick Mochel <mochel@osdl.org> writes:

> > sysfs == Sisyphus, a character of Greek mythology doomed by the gods
> > to roll a boulder up a hill for all time.  When he gets to the top, it
> > rolls back down.
> 
> sysfs != Sisyphus. They are coincidental hominems. 

Homonyms.  Or is this an ad-homonym attack?

> > Kind of like fixing /proc.  <ducks>
> 
> Recall also that (Feature Freeze != Code Freeze). There will be a lot of 
> cleanup and conversion happening the next few months, from old school 
> driver models to the new driver models, and the population of a sane sysfs 
> layout. 
> 
> driverfs will hopefully die today. Stay tuned..
> 
> 	-pat

Re: post-halloween 0.2

[Martin J. Bligh]

> Can you also mention not using gcc 3.0.x (stack pointer handling bug)

Any chance of putting this sort of thing as #error detection
in the compile so it auto-breaks? I seem to recall that's done
for some versions of GCC already ...

M.

Re: post-halloween 0.2

[Ian Soboroff]

Patrick Mochel <mochel@osdl.org> writes:

> > Kind of like fixing /proc.  <ducks>
> 
> Recall also that (Feature Freeze != Code Freeze). There will be a lot of 
> cleanup and conversion happening the next few months, from old school 
> driver models to the new driver models, and the population of a sane sysfs 
> layout. 
> 
> driverfs will hopefully die today. Stay tuned..

Also, I meant to say, no insult was intended, it was just a joke.
ian

Re: post-halloween 0.2

[Patrick Mochel]

> > sysfs != Sisyphus. They are coincidental hominems. 
> 
> Homonyms.  Or is this an ad-homonym attack?

Woops. Hasn't anyone ever told you no one likes a smart ass? ;)

	-pat

Re: post-halloween 0.2

[Alan Cox]

On Wed, 2002-10-30 at 17:11, Dave Jones wrote:

> Regressions:
> ~~~~~~~~~~~~
> (Things not expected to work just yet)
> - The hptraid/promise RAID drivers are currently non functional.
[These hopefully can be converted to use device mapper..]

> - Various SCSI drivers still need work, and don't even compile.

Many older network drivers ditto
Much of the ISDN layer ditto

> - software suspend is still in development, and in need of more work.
>   It is unlikely to work as expected currently.
> - Some filesystems still need work (Coda, Intermezzo).
		UFS, HFS HPFS,...

Add "Most older SCSI controllers are *NOT* doing error handling. Be
careful."
Add "Simplex IDE devices (eg Ali15x3) are missing DMA sometimes"
Add "Serverworks OSB4 may panic on bad blocks or other non fatal errors"
Add "PCMCIA IDE hangs on eject"
Add "Most PCMCIA devices have unload races and may oops on eject"
Add "Modular IDE does not yet work, modular IDE PCI modules sometimes
oops on loading"


>> Deprecated features:
> ~~~~~~~~~~~~~~~~~~~~
> - khttpd is gone.
> - Older Direct Rendering Manager (DRM) support (For XFree86 4.0)
>   has been removed. Upgrade to XFree86 4.1.0 or higher.

LVM1 is no longer supported, upgrade to LVM2. This supports the LVM1
disk format.

 
> PnP layer
> ~~~~~~~~~
> Support for plug and play devices such as early ISAPNP cards has
> improved a lot in the 2.5 kernel. You should no longer need to
> futz with userspace tools to configure IRQ's and the likes.
> Report any regressions in plug & play functionality to
> Adam Belay <ambx1@neo.rr.com>

Right at the moment the executive summary would be "ISAPnP doesnt work
any more but the new interfaces will mean it works a lot better soon (I
hope)"

 
> ALSA
> ~~~~
> The advanced linux sound architecture got merged into 2.5.
> This offers considerably improved functionality over the
> older OSS drivers, but requires new userspace tools.
> Several distros have shipped ALSA for some time, so you
> may already have the necessary tools. If not, you can find them
> at http://www.alsa-project.org/
> (Note that the OSS drivers are also still functional, and
>  still present)

Kind of work in some cases, they are deprecated and may vanish before
2.6 or may vanish the release after.

> IDE
> ~~~
> The IDE code was subject to much criticism in early 2.5.x, which
> put off a lot of people from testing. This work was then subsequently
> dropped, and reverted back to a 2.4.18 IDE status.
> (Since then additional work has occured, but not to the extent
>  of the first cleanup attempts).
> Additional work on the ATA code is happening in 2.4-ac, and pending
> merging to 2.5

Actually its happening in 2.5 back merging to 2.4-ac now.

> IDE TCQ
> ~~~~~~~
> Tagged command queueing for IDE devices has been included.
> Not all devices may like this, so handle with care.
> If you didn't choose the "TCQ on by default" option,
> you can enable it by using the command
> 
> echo "using_tcq:32" > /proc/ide/hdX/settings
> (replacing 32 with 0 disables TCQ again).
> Report success/failure stories to Jens Axboe <axboe@suse.de> with
> inclusion of hdparm -i /dev/hdX

** Don't use IDE TCQ on any data you value.


> x86 CPU detection.
> ~~~~~~~~~~~~~~~~~~
> The CPU detection code got a pretty hefty shake up. To be certain your
> CPU has all relevant workarounds applied, be sure to check that it was
> detected correctly. cat /proc/cpuinfo will tell what the kernel thinks it is.
> Likewise, the x86 MTRR driver got a considerable makeover.
> Any regressions in both should go to mochel@osdl.org

Early PII Xeon processors and possibly other early PII processors
require microcode updates either from the BIOS or the microcode driver
to handle O(1) scheduler reliably

Can you also mention not using gcc 3.0.x (stack pointer handling bug)

Re: post-halloween 0.2

[Tom Rini]

On Wed, Oct 30, 2002 at 11:17:20AM -0800, Martin J. Bligh wrote:
> > Can you also mention not using gcc 3.0.x (stack pointer handling bug)
> 
> Any chance of putting this sort of thing as #error detection
> in the compile so it auto-breaks? I seem to recall that's done
> for some versions of GCC already ...

And what arch is that for?  Adding a nice facility for per-arch (and
maybe global) compiler / binutils testing would be nice, if we're going
to go down that road..

-- 
Tom Rini (TR1265)
http://gate.crashing.org/~trini/

Re: post-halloween 0.2

[Martin J. Bligh]

>> > Can you also mention not using gcc 3.0.x (stack pointer handling bug)
>> 
>> Any chance of putting this sort of thing as #error detection
>> in the compile so it auto-breaks? I seem to recall that's done
>> for some versions of GCC already ...
> 
> And what arch is that for?  Adding a nice facility for per-arch (and
> maybe global) compiler / binutils testing would be nice, if we're going
> to go down that road..

Alan, would you consider something like (TOTALLY untested):

diff -purN -X /home/mbligh/.diff.exclude virgin/init/main.c gcc/init/main.c
--- virgin/init/main.c	Fri Oct 18 21:01:16 2002
+++ gcc/init/main.c	Wed Oct 30 11:54:54 2002
@@ -50,7 +50,7 @@
  * To avoid associated bogus bug reports, we flatly refuse to compile
  * with a gcc that is known to be too old from the very beginning.
  */
-#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 91)
+#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 91) || (__GNUC__ == 3 && __GNUC_MINOR__ == 0)
 #error Sorry, your GCC is too old. It builds incorrect kernels.
 #endif
 
If you like it, I'll get it tested.

Probably some things are per-arch and some are global, at a guess.
Currently we have:

init/main.c:
/*
 * Versions of gcc older than that listed below may actually compile
 * and link okay, but the end product can have subtle run time bugs.
 * To avoid associated bogus bug reports, we flatly refuse to compile
 * with a gcc that is known to be too old from the very beginning.
 */
#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 91)
#error Sorry, your GCC is too old. It builds incorrect kernels.
#endif

arch/arm/kernel/asm-offsets.c 

/*
 * Make sure that the compiler and target are compatible.
 */
#if defined(__APCS_32__) && defined(CONFIG_CPU_26)
#error Sorry, your compiler targets APCS-32 but this kernel requires APCS-26
#endif
#if defined(__APCS_26__) && defined(CONFIG_CPU_32)
#error Sorry, your compiler targets APCS-26 but this kernel requires APCS-32
#endif
#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 95)
#error Sorry, your compiler is known to miscompile kernels.  Only use gcc 2.95.3
 and later.
#endif
#if __GNUC__ == 2 && __GNUC_MINOR__ == 95
/* shame we can't detect the .1 or .2 releases */
#warning GCC 2.95.2 and earlier miscompiles kernels.
#endif

Re: post-halloween 0.2

[Tom Rini]

On Wed, Oct 30, 2002 at 11:57:58AM -0800, Martin J. Bligh wrote:
> >> > Can you also mention not using gcc 3.0.x (stack pointer handling bug)
> >> 
> >> Any chance of putting this sort of thing as #error detection
> >> in the compile so it auto-breaks? I seem to recall that's done
> >> for some versions of GCC already ...
> > 
> > And what arch is that for?  Adding a nice facility for per-arch (and
> > maybe global) compiler / binutils testing would be nice, if we're going
> > to go down that road..
> 
> Alan, would you consider something like (TOTALLY untested):
[snip]

So it's a global thing then?
 
> If you like it, I'll get it tested.
> 
> Probably some things are per-arch and some are global, at a guess.
> Currently we have:
[snip]

And then ppc32 does some binutils checks, not-in-C and before we let the
kernel get too far.  What I was proposing is we add something outside of
the direct kernel src (something in scripts?  Generic make magic?) to
verify that a compiler / binutils / whatever tool is a good version.
This is rather easy for binutils + obvious instruction problem (missing
/ incorrect operands), and for compiler versions, something to generate
a test-file and then see if it compiles.

-- 
Tom Rini (TR1265)
http://gate.crashing.org/~trini/

Re: post-halloween 0.2

[Arador]

On Wed, 30 Oct 2002 11:57:58 -0800
"Martin J. Bligh" <mbligh@aracnet.com> wrote:

>  #error Sorry, your GCC is too old. It builds incorrect kernels.

well, we are calling 3.0 "old" when 2.95 works. Changing the
text here would be nice too :)

Re: post-halloween 0.2

[Martin J. Bligh]

> On Wed, 30 Oct 2002 11:57:58 -0800
> "Martin J. Bligh" <mbligh@aracnet.com> wrote:
> 
>>  # error Sorry, your GCC is too old. It builds incorrect kernels.
> 
> well, we are calling 3.0 "old" when 2.95 works. Changing the
> text here would be nice too :)

#error Sorry, your GCC is too crap. It builds incorrect kernels.

?

M.

Re: post-halloween 0.2

[Pavel Machek]

Hi!

> Latest version of this document can always be found at
> http://www.codemonkey.org.uk/post-halloween-2.5.txt
> 
> 
> Regressions:
> ~~~~~~~~~~~~
> (Things not expected to work just yet)
> - The hptraid/promise RAID drivers are currently non functional.
> - Various SCSI drivers still need work, and don't even compile.
> - software suspend is still in development, and in need of more work.
>   It is unlikely to work as expected currently.

As swsusp is new feature in 2.5. (it does not exist in official 2.4),
I do not think it is regression. Anyway, I hope to fix that real soon
now.
								Pavel
-- 
When do you have heart between your knees?

Re: post-halloween 0.2

[Alan Cox]

On Wed, 2002-10-30 at 19:57, Martin J. Bligh wrote:
> Alan, would you consider something like (TOTALLY untested):

Except that I don't know if its an X86 specific problem. I'll see if
Jakub knows the exact releases

Re: post-halloween 0.2

[Skip Ford]

Dave Jones wrote:
> I updated the list of various things that wannabe testers might hit.
> If theres something I missed let me know, and I'll get it right
> next time round..
> 
> Deprecated features:
> ~~~~~~~~~~~~~~~~~~~~
> - khttpd is gone.
> - Older Direct Rendering Manager (DRM) support (For XFree86 4.0)
>   has been removed. Upgrade to XFree86 4.1.0 or higher.

Anyone that uses multimedia keys without X will see changes in how the
kernel handles those keys.  People who customize keymaps or keycodes in
2.4 may need to make some changes to those scripts in 2.5

A new keyboard package was released, but I haven't tested it yet to make
sure everything works.  I hacked up loadkeys and setkeycodes on my own
to get it to work, and I just haven't upgraded to the new package yet.

> Input layer
> ~~~~~~~~~~~
> Possibly the most visible change to the end user. If misconfigured,
> you'll find that your keyboard/mouse/other input device will no longer work.
> 2.5 offers a much more flexable interface to devices such as keyboards.
> The downside is more confusing options.
> In the "Input device support" menu, be sure to enable at least the following.
> 
>                     --- Input I/O drivers
>                     < > Serial i/o support
>                     < >   i8042 PC Keyboard controller
>                     [ ] Keyboards
>                     [ ] Mice
> 
> (Also choose the relevant keyboard/mouse from the list)
> 
> If you find your keyboard/mouse still don't work, edit the file
> drivers/input/serio/i8042.c, and replace the #undef DEBUG
> with a #define DEBUG
> 
> When you boot, you should now see a lot more debugging information.
> Forward this information to Vojtech Pavlik <vojtech@suse.cz>
> 
> If you use a KVM switcher, and experience problems, booting
> with the boot time argument 'psmouse_noext' should fix your
> problems.

-- 
Skip

Re: post-halloween 0.2

[Dave Jones]

On Wed, Oct 30, 2002 at 07:33:01PM +0000, Alan Cox wrote:

 > > (Things not expected to work just yet)
 > > - The hptraid/promise RAID drivers are currently non functional.
 > [These hopefully can be converted to use device mapper..]

Thats a fairly large 'mandatory' requirement for existing users
of hptraid and friends.

 > > - Various SCSI drivers still need work, and don't even compile.
 > Many older network drivers ditto
 > Much of the ISDN layer ditto

I held off on this to see if Kai would get things in order in time.
Looking at current BK, it looks like he's done quite a bit.
Kai, any changes from a user point of view wrt tools ?

 > > - software suspend is still in development, and in need of more work.
 > >   It is unlikely to work as expected currently.
 > > - Some filesystems still need work (Coda, Intermezzo).
 > 		UFS, HFS HPFS,...

Hadn't realised they were still broken. Added to the list.

 > Add "Most older SCSI controllers are *NOT* doing error handling. Be
 > careful."

Added. Was covered by the 'most drivers wont compile' though now that
current BK has nuked the abort: and reset: members.

 > Add "Simplex IDE devices (eg Ali15x3) are missing DMA sometimes"
 > Add "Serverworks OSB4 may panic on bad blocks or other non fatal errors"
 > Add "PCMCIA IDE hangs on eject"
 > Add "Most PCMCIA devices have unload races and may oops on eject"
 > Add "Modular IDE does not yet work, modular IDE PCI modules sometimes
 > oops on loading"
 
Added.

 > LVM1 is no longer supported, upgrade to LVM2. This supports the LVM1
 > disk format.

Was covered in the devicemapper section.
Reworded to make the 'backwards compatability' thing a bit more obvious.

 > > (Note that the OSS drivers are also still functional, and
 > >  still present)
 > Kind of work in some cases, they are deprecated and may vanish before
 > 2.6 or may vanish the release after.

I'd agree that it would make sense to at least remove some of the
lesser maintained drivers. Linus didnt seem to keen on the idea
last time I proposed it.

 > > Additional work on the ATA code is happening in 2.4-ac, and pending
 > > merging to 2.5
 > Actually its happening in 2.5 back merging to 2.4-ac now.

Oops, my bad. Hard to keep up with the crazy world of IDE these days..

 > > IDE TCQ
 > > ~~~~~~~
 > > Tagged command queueing for IDE devices has been included.
 > > Not all devices may like this, so handle with care.
 > > If you didn't choose the "TCQ on by default" option,
 > > you can enable it by using the command
 > > 
 > > echo "using_tcq:32" > /proc/ide/hdX/settings
 > > (replacing 32 with 0 disables TCQ again).
 > > Report success/failure stories to Jens Axboe <axboe@suse.de> with
 > > inclusion of hdparm -i /dev/hdX
 > 
 > ** Don't use IDE TCQ on any data you value.

Ok, I'll make that a little bolder. (In fact, I'll just
cut-n-paste your text 8-)


Thanks for the feedback. I've merged the rest of your
comments, and will put an updated version up after
merging everyone elses feedback too 8-)

BTW: How's i2o shaping up in 2.5 ?

		Dave

-- 
| Dave Jones.        http://www.codemonkey.org.uk

Htree ate my hard drive, was: post-halloween 0.2

[Duncan Sands]

> EXT3 Htree support.
> ~~~~~~~~~~~~~~~~~~~
> The ext3 filesystem has gained indexed directory support, which offers
> considerable performance gains when used on filesystems with large
> directories. In order to use the htree feature, you need at least version
> 1.29 of e2fsprogs. Existing filesystems can be converted using the command
> "tune2fs -O dir_index /dev/hdXXX" The latest e2fsprogs can be found at
> http://prdownloads.sourceforge.net/e2fsprogs

I ran this (tune2fs -O dir_index /dev/hdXXX).

After a bit of switching back and forth between 2.4.19 and 2.5.44,
fsck was run while booting 2.4.19 (the usual check because of >30
mounts).  There was a message about optimizing directories.  Booting
continued but (big surprise) X refused to run.  It turned out that some
device files had vanished.  Very strange.  On rebooting, fsck found a
gazillion bad inodes.  They all turned out to be from the 2.5.44 tree -
poetic justice I suppose!  But this did not suffice.  Rebooting, I got
"optimizing directories" again.  Next fsck showed up more dud inodes.
After a few cycles of this, I ran

tune2fs -O ^dir_index /dev/hdXXX

to remove htree support.  No problems since then.

Duncan.

PS: UP, no preempt.

tune2fs 1.30-WIP (30-Sep-2002)
Filesystem volume name:   <none>
Last mounted on:          <not available>
Filesystem UUID:          ee433ceb-6b14-45b1-894c-2a8aad1e280f
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal needs_recovery
Filesystem state:         clean
Errors behavior:          Unknown (continue)
Filesystem OS type:       Linux
Inode count:              290816
Block count:              2315368
Reserved block count:     115768
Free blocks:              871842
Free inodes:              36718
First block:              0
Block size:               4096
Fragment size:            4096
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         4096
Inode blocks per group:   128
Last mount time:          Thu Oct 31 06:37:46 2002
Last write time:          Thu Oct 31 06:37:46 2002
Mount count:              7
Maximum mount count:      30
Last checked:             Wed Oct 30 11:50:37 2002
Check interval:           0 (<none>)
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               128
Journal UUID:             <none>
Journal inode:            493
Journal device:           0x0000
First orphan inode:       139500

Re: Htree ate my hard drive, was: post-halloween 0.2

[Andreas Dilger]

On Oct 31, 2002  07:27 +0100, Duncan Sands wrote:
> > EXT3 Htree support.
> > ~~~~~~~~~~~~~~~~~~~
> > The ext3 filesystem has gained indexed directory support, which offers
> > considerable performance gains when used on filesystems with large
> > directories. In order to use the htree feature, you need at least version
> > 1.29 of e2fsprogs. Existing filesystems can be converted using the command
> > "tune2fs -O dir_index /dev/hdXXX" The latest e2fsprogs can be found at
> > http://prdownloads.sourceforge.net/e2fsprogs
> 
> I ran this (tune2fs -O dir_index /dev/hdXXX).
> 
> After a bit of switching back and forth between 2.4.19 and 2.5.44,
> fsck was run while booting 2.4.19 (the usual check because of >30
> mounts).  There was a message about optimizing directories.  Booting
> continued but (big surprise) X refused to run.  It turned out that some
> device files had vanished.  Very strange.  On rebooting, fsck found a
> gazillion bad inodes.  They all turned out to be from the 2.5.44 tree -
> poetic justice I suppose!  But this did not suffice.  Rebooting, I got
> "optimizing directories" again.  Next fsck showed up more dud inodes.
> After a few cycles of this, I ran
> 
> tune2fs -O ^dir_index /dev/hdXXX
> 
> to remove htree support.  No problems since then.
> 
> tune2fs 1.30-WIP (30-Sep-2002)

I wonder if there is still a bug in the e2fsck code for re-hashing
directories?  It shouldn't be possible to have e2fsck complete and
there still be an error in the filesystem (ok, sometimes it happens,
but in those cases it spews a lot of warnings about the filesystem
not being fixed yet and to run manually).

What else is strange (at least to me) is e2fsck "optimizing directories"
on a reboot.  My understanding at least is that this would be done only
when explicitly asked for, otherwise it might slow down booting a lot,
and as you can see it adds to the possibility of corrupting the fs when
e2fsck should only be fixing it.

Cheers, Andreas
--
Andreas Dilger
http://www-mddsp.enel.ucalgary.ca/People/adilger/
http://sourceforge.net/projects/ext2resize/

Re: Htree ate my hard drive, was: post-halloween 0.2

[Duncan Sands]

On Thursday 31 October 2002 09:07, Andreas Dilger wrote:
> On Oct 31, 2002  07:27 +0100, Duncan Sands wrote:
> > > EXT3 Htree support.
> > > ~~~~~~~~~~~~~~~~~~~
> > > The ext3 filesystem has gained indexed directory support, which offers
> > > considerable performance gains when used on filesystems with large
> > > directories. In order to use the htree feature, you need at least
> > > version 1.29 of e2fsprogs. Existing filesystems can be converted using
> > > the command "tune2fs -O dir_index /dev/hdXXX" The latest e2fsprogs can
> > > be found at http://prdownloads.sourceforge.net/e2fsprogs
> >
> > I ran this (tune2fs -O dir_index /dev/hdXXX).
> >
> > After a bit of switching back and forth between 2.4.19 and 2.5.44,
> > fsck was run while booting 2.4.19 (the usual check because of >30
> > mounts).  There was a message about optimizing directories.  Booting
> > continued but (big surprise) X refused to run.  It turned out that some
> > device files had vanished.  Very strange.  On rebooting, fsck found a
> > gazillion bad inodes.  They all turned out to be from the 2.5.44 tree -
> > poetic justice I suppose!  But this did not suffice.  Rebooting, I got
> > "optimizing directories" again.  Next fsck showed up more dud inodes.
> > After a few cycles of this, I ran
> >
> > tune2fs -O ^dir_index /dev/hdXXX
> >
> > to remove htree support.  No problems since then.
> >
> > tune2fs 1.30-WIP (30-Sep-2002)
>
> I wonder if there is still a bug in the e2fsck code for re-hashing
> directories?  It shouldn't be possible to have e2fsck complete and
> there still be an error in the filesystem (ok, sometimes it happens,
> but in those cases it spews a lot of warnings about the filesystem
> not being fixed yet and to run manually).

It is possible that the filesystem was fine when fsck completed, but
was damaged afterwards, i.e. in the time between fsck completing
and the reboot.

Duncan.

> What else is strange (at least to me) is e2fsck "optimizing directories"
> on a reboot.  My understanding at least is that this would be done only
> when explicitly asked for, otherwise it might slow down booting a lot,
> and as you can see it adds to the possibility of corrupting the fs when
> e2fsck should only be fixing it.

Re: post-halloween 0.2

[Alan Cox]

On Thu, 2002-10-31 at 00:47, Dave Jones wrote:
> On Wed, Oct 30, 2002 at 07:33:01PM +0000, Alan Cox wrote:
> 
>  > > (Things not expected to work just yet)
>  > > - The hptraid/promise RAID drivers are currently non functional.
>  > [These hopefully can be converted to use device mapper..]
> 
> Thats a fairly large 'mandatory' requirement for existing users
> of hptraid and friends.

Whether its a userspace thing or DM is simply told by the hptraid driver
to do the work for it is an open question yes

>  > > (Note that the OSS drivers are also still functional, and
>  > >  still present)
>  > Kind of work in some cases, they are deprecated and may vanish before
>  > 2.6 or may vanish the release after.
> 
> I'd agree that it would make sense to at least remove some of the
> lesser maintained drivers. Linus didnt seem to keen on the idea
> last time I proposed it.

OSS hasnt worked on SMP between about 2.5.35 and 2.5.44 so I dont think
its that major 8)

> BTW: How's i2o shaping up in 2.5 ?

It compiles I've got to put stuff together to do the full test runs on
it yet. The code is actually a lot cleaner with the new block layer,
much more scalable and also Al Viro took a hatchet to bits of it when
tidying the block layer so the disk add/remove and other stuff has also
improved dramatically. The fast path for I/O now executes a mere four
instructions within the driver under a spinlock on i2o_block 8)

Mostly I'm working on the NCR5380 first. That happens to be attached to
my scanner so spinning for 15 seconds in IRQ context is annoying me 8)

Re: Htree ate my hard drive, was: post-halloween 0.2

[Mike Civil]

In article <200210310727.52636.baldrick@wanadoo.fr> you write:
>
>> EXT3 Htree support.
>> ~~~~~~~~~~~~~~~~~~~
>> The ext3 filesystem has gained indexed directory support, which offers
>> considerable performance gains when used on filesystems with large
>> directories. In order to use the htree feature, you need at least version
>> 1.29 of e2fsprogs. Existing filesystems can be converted using the command
>> "tune2fs -O dir_index /dev/hdXXX" The latest e2fsprogs can be found at
>> http://prdownloads.sourceforge.net/e2fsprogs
>
>I ran this (tune2fs -O dir_index /dev/hdXXX).
>
>After a bit of switching back and forth between 2.4.19 and 2.5.44,
>fsck was run while booting 2.4.19 (the usual check because of >30
>mounts).  There was a message about optimizing directories.  Booting
>continued but (big surprise) X refused to run.  It turned out that some
>device files had vanished.  Very strange.  On rebooting, fsck found a
>gazillion bad inodes.  They all turned out to be from the 2.5.44 tree -
>poetic justice I suppose!  But this did not suffice.  Rebooting, I got
>"optimizing directories" again.  Next fsck showed up more dud inodes.

For info, I had this as well. Kernel 2.4.19 only. Using e2fsprogs 1.29.

I've not used tune2fs, just using -D switch to e2fsck. Using ext3 on
all filesystems.

No obvious complaints from e2fsck, although I wasn't really watching
it. No entries in /'s lost+found. No problems with other filesystems.

Only lost device files in /dev (about 120) with no discernible pattern.

Mike

dumpe2fs output:

Filesystem volume name:   root
Last mounted on:          /
Filesystem UUID:          6278d5f9-5583-4651-8d58-f12886a4e3a9
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal dir_index filetype needs_recovery sparse_super
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              122624
Block count:              244991
Reserved block count:     2449
Free blocks:              79421
Free inodes:              86789
First block:              0
Block size:               4096
Fragment size:            4096
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         15328
Inode blocks per group:   479
Last mount time:          Thu Oct 31 17:08:15 2002
Last write time:          Thu Oct 31 17:08:15 2002
Mount count:              4
Maximum mount count:      31
Last checked:             Wed Oct 30 18:57:46 2002
Check interval:           15552000 (6 months)
Next check after:         Mon Apr 28 19:57:46 2003
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               128
Journal UUID:             <none>
Journal inode:            8
Journal device:           0x0000
First orphan inode:       0
Default directory hash:   tea
Directory Hash Seed:      c9f2f715-bc28-4302-a2e9-e53aa08576f7

Re: post-halloween 0.2

[Bill Davidsen]

On 31 Oct 2002, Alan Cox wrote:

> On Thu, 2002-10-31 at 00:47, Dave Jones wrote:

> > I'd agree that it would make sense to at least remove some of the
> > lesser maintained drivers. Linus didnt seem to keen on the idea
> > last time I proposed it.
> 
> OSS hasnt worked on SMP between about 2.5.35 and 2.5.44 so I dont think
> its that major 8)

Thank you, since all the systems I have been using for 2.5 testing are
SMP, I just thought sound was broken in general. And still may be, since I
found that some audio CD's I burned with 2.5 are just noise while the same
hardware burned CD's from the same batch of blanks using 2.4.19+patches.
Using SMP. I'll try a uni burn tomorrow.
 
> Mostly I'm working on the NCR5380 first. That happens to be attached to
> my scanner so spinning for 15 seconds in IRQ context is annoying me 8)

I can't get the aha142x working either, if you're looking for stuff to do
;-)

-- 
bill davidsen <davidsen@tmr.com>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.

Re: Htree ate my hard drive, was: post-halloween 0.2

[Duncan Sands]

On Friday 01 November 2002 00:05, Mike Civil wrote:
> For info, I had this as well. Kernel 2.4.19 only. Using e2fsprogs 1.29.

Do you mean that you did not run a 2.5 kernel, or that you tried several
2.4 kernels and this was the only one that chewed on your hard drive?

Ciao,

Duncan.

Re: Htree ate my hard drive, was: post-halloween 0.2

[Mike Civil]

In article <200211032142.43432.baldrick@wanadoo.fr>,
Duncan Sands <baldrick@wanadoo.fr> wrote:
>
>On Friday 01 November 2002 00:05, Mike Civil wrote:
>> For info, I had this as well. Kernel 2.4.19 only. Using e2fsprogs 1.29.
>
>Do you mean that you did not run a 2.5 kernel, or that you tried several
>2.4 kernels and this was the only one that chewed on your hard drive?

No, at the moment I only run a 2.4.19 kernel.

Mike

Re: Htree ate my hard drive, was: post-halloween 0.2

[Martin Waitz]

[-- Attachment #1: Type: text/plain, Size: 1169 bytes --]

hi :)

after testing htree support, i ran into similar problems:

booted 2.5, tune2fs -O dir_index on all filesystems,
umounted home
fscked -D home, mounted home, all is well...
rebooted into 2.4.19 and everything is still fine

then i got a 'maximum mount count reached' on / while booting 2.4
on fscking, it optimized some directories.
afterwards i had some files missing all over the root fs

after removing dir_index all files were there again

lately my / got checked again, and fsck complained about some
hashed directory entries on a fs without dir_index...
i had to press return several times but did not run into problems...

-- 
CU,		  / Friedrich-Alexander University Erlangen, Germany
Martin Waitz	//  [Tali on IRCnet]  [tali.home.pages.de] _________
______________/// - - - - - - - - - - - - - - - - - - - - ///
dies ist eine manuell generierte mail, sie beinhaltet    //
tippfehler und ist auch ohne grossbuchstaben gueltig.   /
			    -
Wer bereit ist, grundlegende Freiheiten aufzugeben, um sich 
kurzfristige Sicherheit zu verschaffen, der hat weder Freiheit 
noch Sicherheit verdient.
			Benjamin Franklin  (1706 - 1790)

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Re: [Ext2-devel] Re: Htree ate my hard drive, was: post-halloween 0.2

[Stephen C. Tweedie]

Hi,

On Thu, Oct 31, 2002 at 01:07:17AM -0700, Andreas Dilger wrote:
> On Oct 31, 2002  07:27 +0100, Duncan Sands wrote:

> > After a bit of switching back and forth between 2.4.19 and 2.5.44,
> > fsck was run while booting 2.4.19 (the usual check because of >30
> > mounts).  There was a message about optimizing directories.  Booting
> > continued but (big surprise) X refused to run.  It turned out that some
> > device files had vanished.

> > tune2fs -O ^dir_index /dev/hdXXX
> > to remove htree support.  No problems since then.

> I wonder if there is still a bug in the e2fsck code for re-hashing
> directories?

Possibly, but I'm more worried about why the fsck did a directory
optimise on reboot, especially on the root filesystem (where /dev is
usually stored).  Doing major fs surgery on a mounted, readonly
filesystem is sort-of safe, but only if you reboot afterwards.
Continuing and remounting read-write can cause all sorts of damage as
the cached fs data no longer matches what's on disk.

Duncan, did you have fsck set up to do a forced htree rebuild on
reboot?

Cheers,
 Stephen

Re: [Ext2-devel] Re: Htree ate my hard drive, was: post-halloween 0.2

[Duncan Sands]

On Monday 04 November 2002 23:42, Stephen C. Tweedie wrote:
> Hi,
>
> On Thu, Oct 31, 2002 at 01:07:17AM -0700, Andreas Dilger wrote:
> > On Oct 31, 2002  07:27 +0100, Duncan Sands wrote:
> > > After a bit of switching back and forth between 2.4.19 and 2.5.44,
> > > fsck was run while booting 2.4.19 (the usual check because of >30
> > > mounts).  There was a message about optimizing directories.  Booting
> > > continued but (big surprise) X refused to run.  It turned out that some
> > > device files had vanished.
> > >
> > > tune2fs -O ^dir_index /dev/hdXXX
> > > to remove htree support.  No problems since then.
> >
> > I wonder if there is still a bug in the e2fsck code for re-hashing
> > directories?
>
> Possibly, but I'm more worried about why the fsck did a directory
> optimise on reboot, especially on the root filesystem (where /dev is
> usually stored).  Doing major fs surgery on a mounted, readonly
> filesystem is sort-of safe, but only if you reboot afterwards.
> Continuing and remounting read-write can cause all sorts of damage as
> the cached fs data no longer matches what's on disk.
>
> Duncan, did you have fsck set up to do a forced htree rebuild on
> reboot?

Hmmm, fsck is called from the debian checkroot init script which does
fsck -a -C
So I guess the answer is "no".

Duncan.

PS: I am using version 1.30-WIP of e2fsck.

Re: [Ext2-devel] Re: Htree ate my hard drive, was: post-halloween 0.2

[Udo A. Steinberg]

[-- Attachment #1: Type: text/plain, Size: 1136 bytes --]

On Mon, 4 Nov 2002 22:42:13 +0000 Stephen C. Tweedie (SCT) wrote:

SCT> On Thu, Oct 31, 2002 at 01:07:17AM -0700, Andreas Dilger wrote:
SCT> > I wonder if there is still a bug in the e2fsck code for re-hashing
SCT> > directories?
SCT> 
SCT> Possibly, but I'm more worried about why the fsck did a directory
SCT> optimise on reboot, especially on the root filesystem (where /dev is
SCT> usually stored).  Doing major fs surgery on a mounted, readonly
SCT> filesystem is sort-of safe, but only if you reboot afterwards.
SCT> Continuing and remounting read-write can cause all sorts of damage as
SCT> the cached fs data no longer matches what's on disk.

Just a "me too". I've used htree with 2.5.44 and 2.4.20rc1. The next
fs check on the root filesystem founds corruption in /dev. After repairing
the damage and recreating the lost devices the machine ran ok for 2 days.
Then I had some ext3-fs errors and the partition got remounted read-only.
The following fsck revealed two inodes sharing the same block. I don't
have any logs of that incident anymore though :/

I'm running Slackware 9.0-beta and e2fsprogs-1.30-WIP.

Regards,
-Udo.

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Re: post-halloween 0.2

[Jan Kara]

  Hi,
  
> Quota reworking
> ~~~~~~~~~~~~~~~
> The new quota system needs new tools.
> ftp://atrey.karlin.mff.cuni.cz/pub/local/jack/quota/utils/alpha/quota-3.05-pre1.tar.gz
  http://www.sf.net/projects/linuxquota/ is actually the right address
  for getting new quota tools (it's even written in README in my FTP
  directory - but who does read README files :)).

  									Honza

Re: post-halloween 0.2

[Dave Jones]

On Thu, Nov 07, 2002 at 04:36:41PM +0100, Jan Kara wrote:

 > > The new quota system needs new tools.
 > > ftp://atrey.karlin.mff.cuni.cz/pub/local/jack/quota/utils/alpha/quota-3.05-pre1.tar.gz
 >   http://www.sf.net/projects/linuxquota/ is actually the right address
 >   for getting new quota tools (it's even written in README in my FTP
 >   directory - but who does read README files :)).

I just cut-n-pasted from your original announcement 8-)
URL has been updated anyway,. Thanks for the update.

		Dave

-- 
| Dave Jones.        http://www.codemonkey.org.uk