Hello,
q01 - Could this method be used to find the last used block on reiser4
volume to allow [truncate] of volume ?
q02 - what tools or commands can be used to truncate reiser4 partition
past the last used block ?
thanks
--Glenn
Steps used:
Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0009a8dd
# fdisk -l
Device Boot Start End Blocks Id System\
/dev/sdb2 3221225472 3907028991 342901760 83 Linux
example: mount volume and find accessible files
# mount /dev/sdb2 /media/disk2
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sdb2 311G 109G 203G 35% /media/disk2
# ll /media/disk2
total 113430164
-rw-r--r-- 1 root root 116148741254 Feb 28 21:12 r4files-sdb.tgz
-rw-r--r-- 1 root root 2466549 Mar 4 00:45 reiser4-for-4.10.0.patch
-rw-r--r-- 1 root root 625844 Mar 4 00:45
reiser4-for-4.10.0.patch.gz
-rw-r--r-- 1 root root 625387 Mar 4 00:49
reiser4-for-4.9.3.patch.gz
# cd /media/disk2
find . |sort > /tmp/files-on-volume.txt
# cat /tmp/files-on-volume.txt
.
./r4files-sdb.tgz
./reiser4-for-4.10.0.patch
./reiser4-for-4.10.0.patch.gz
./reiser4-for-4.9.3.patch.gz
# cd /tmp
/tmp # umount /dev/sdb2
# debugfs.reiser4 /dev/sdb2 --print-nodes r4files-sdb.tgz >
/tmp/print-nodes.txt
debugfs.reiser4 1.1.0
Format release: 4.0.1
Copyright (C) 2001-2005 by Hans Reiser, licensing governed by
reiser4progs/COPYING.
# debugfs.reiser4 /dev/sdb2 --print-nodes r4files-sdb.tgz |grep -i
"UNITS=" > /tmp/print-nodes-units.txt
# debugfs.reiser4 /dev/sdb2 --print-nodes r4files-sdb.tgz |grep -i
"UNITS=" | cut -c12- |sed 's/char//g'
# debugfs.reiser4 /dev/sdb2 --print-super
debugfs.reiser4 1.1.0
Format release: 4.0.1
Copyright (C) 2001-2005 by Hans Reiser, licensing governed by
reiser4progs/COPYING.
Master super block (16):
magic: ReIsEr4
blksize: 4096
format: 0x0 (format40)
uuid: 139d06a8-1886-44a0-a058-8f9da1ab88cf
label: <none>
Format super block (17):
plugin: format40
description: Disk-format plugin.
version: 1
magic: ReIsEr40FoRmAt
mkfs id: 0x14b9244f
flushes: 0
blocks: 85725440
free blocks: 57365574
root block: 28395039
tail policy: 0x2 (smart)
next oid: 0x10004
file count: 5
tree height: 3
key policy: LARGE
FS status block (21):
FS marked consistent
#
# debugfs.reiser4 /dev/sdb2 --print-nodes r4files-sdb.tgz |grep -i
"UNITS=" | cut -c12- | sed 's/ /\n/g' |hesd
debugfs.reiser4 1.1.0
Format release: 4.0.1
Copyright (C) 2001-2005 by Hans Reiser, licensing governed by
reiser4progs/COPYING.
36925(28547)
65474(32734)
98209(32735)
130946(32734)
163681(32735)
196418(32734)
229153(32735)
261889(32735)
294626(32734)
327361(32735)
# debugfs.reiser4 /dev/sdb2 --print-nodes r4files-sdb.tgz |grep -i
"UNITS=" | cut -c12- | sed 's/ /\n/g' | cut -d"(" -f1 |head
debugfs.reiser4 1.1.0
Format release: 4.0.1
Copyright (C) 2001-2005 by Hans Reiser, licensing governed by
reiser4progs/COPYING.
36925
65474
98209
130946
163681
196418
229153
261889
294626
327361
-last used block
# debugfs.reiser4 /dev/sdb2 --print-nodes r4files-sdb.tgz |grep -i
"UNITS=" | cut -c12- | sed 's/ /\n/g' | cut -d"(" -f1 |tail
debugfs.reiser4 1.1.0
Format release: 4.0.1
Copyright (C) 2001-2005 by Hans Reiser, licensing governed by
reiser4progs/COPYING.
28120225
28152961
28185697
28187399
28218433
28251169
28283905
28316641
28349377
28382113
# debugfs.reiser4 /dev/sdb2 --print-nodes reiser4-for-4.10.0.patch
|grep -i "UNITS=" | cut -c12- | sed 's/ /\n/g' | cut -d"(" -f1 |tail
debugfs.reiser4 1.1.0
Format release: 4.0.1
Copyright (C) 2001-2005 by Hans Reiser, licensing governed by
reiser4progs/COPYING.
#
# debugfs.reiser4 /dev/sdb2 --print-nodes reiser4-for-4.9.3.patch.gz
|grep -i "UNITS=" | cut -c12- | sed 's/ /\n/g' | cut -d"(" -f1 |tail
debugfs.reiser4 1.1.0
Format release: 4.0.1
Copyright (C) 2001-2005 by Hans Reiser, licensing governed by
reiser4progs/COPYING.
394733
394886
- block calculations
--------------------
blocks: 85725440
free blocks: 57365574
last block used 28382113
total blocks for r4 volume - last block used on r4 volume
85725440 - 28382113
85,725,440 -
28,382,113
----------
57,343,327
----------
volume could shrink to minimum of total blocks for r4 volume - (last block
used on r4 volume + 1 ) = [28382114]
no r4 used blocks need to be altered or moved,
-Is this correct ?
Thanks
--Glenn
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