* debugfs fill_bgs command?
@ 2007-04-11 20:17 Eric Sandeen
2007-04-11 22:52 ` Andreas Dilger
0 siblings, 1 reply; 3+ messages in thread
From: Eric Sandeen @ 2007-04-11 20:17 UTC (permalink / raw)
To: ext4 development
I was wondering if others think it would be useful to have a "fill_bgs"
command in debugfs; this would (minimally) mark the lower X bgs as full
for both inodes & blocks (possibly either/or), to allow testing the
higher block groups. I'm using a hacked up version of this to do a
little ext3 testing above 8T. Given that this would really only be a
testing option in nature, would it be accepted into e2fsprogs? I'd
probably need some sort of "unfill" command as well, to put the bg
counters back where they should be; probably by actually reading the
bitmaps. This way fsck would still find a consistent filesystem...
I had originally written a set_bg_field function too, to go with inode &
sb variants, though for marking the first few thousand bg's it was going
to get a bit tedious... :)
Thoughts?
Thanks,
-Eric
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: debugfs fill_bgs command?
2007-04-11 20:17 debugfs fill_bgs command? Eric Sandeen
@ 2007-04-11 22:52 ` Andreas Dilger
2007-04-12 1:21 ` Eric Sandeen
0 siblings, 1 reply; 3+ messages in thread
From: Andreas Dilger @ 2007-04-11 22:52 UTC (permalink / raw)
To: Eric Sandeen; +Cc: ext4 development
On Apr 11, 2007 15:17 -0500, Eric Sandeen wrote:
> I was wondering if others think it would be useful to have a "fill_bgs"
> command in debugfs; this would (minimally) mark the lower X bgs as full
> for both inodes & blocks (possibly either/or), to allow testing the
> higher block groups. I'm using a hacked up version of this to do a
> little ext3 testing above 8T. Given that this would really only be a
> testing option in nature, would it be accepted into e2fsprogs? I'd
> probably need some sort of "unfill" command as well, to put the bg
> counters back where they should be; probably by actually reading the
> bitmaps. This way fsck would still find a consistent filesystem...
>
> I had originally written a set_bg_field function too, to go with inode &
> sb variants, though for marking the first few thousand bg's it was going
> to get a bit tedious... :)
Try "mke2fs -O lazy_bg XXX" and be happy. Can be used on any kernel as
it is a COMPAT feature and marks all but first and last groups as full.
Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2007-04-11 20:17 debugfs fill_bgs command? Eric Sandeen
2007-04-11 22:52 ` Andreas Dilger
2007-04-12 1:21 ` Eric Sandeen
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