From: Amir Goldstein <amir73il@gmail.com>
Subject: Re: flashing large eMMC partitions with ext4
Date: Tue, 2 Aug 2011 10:42:22 +0300
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Cc: Dilger Andreas <aedilger@gmail.com>, "Ted Ts'o" <tytso@mit.edu>,
	"linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>
To: Round Robinjp <roundrobinjp@yahoo.co.jp>
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On Tue, Aug 2, 2011 at 9:53 AM, Round Robinjp <roundrobinjp@yahoo.co.jp=
> wrote:
> Amir
>
>> create the initial a.img 4G and specify 1G to mkfs.
>> so the loop device size is 4G and you can online resize the fs to 4G=
=2E
>
> I think this time I have been able to achieve what I was
> trying to.
>

Yes, you have :-)

> After resize, there are 1048576 blocks, as expected.
> After truncating to 1G, dumpe2fs gives error, but I guess
> this is also expected behaviour.
>
> But after extending to 4G, e2fsck makes some complain.
> I guess this is not expected behaviour, is it?
>

it is expected when you use the current resize2fs,
which does not respect the flex_bg layout, so new group block bitmaps
are allocated beyond the 1G border and initialized.
if you use Yongqiang's new 64bit resize patches, the final fsck won't c=
omplain.
unfortunately for you, those patches have not been merged to the kernel=
 yet,
so you will have to either build your own ext4 module or wait at least =
until
kernel 3.2 is released to have it in mainline.

It is actually quite simple to fix the 1G image, so it will pass fsck
after truncate -s 4G.
All it takes it setting the BLOCK_UNINIT flag in groups 8-31
this should be possible to do with debugfs (or write a small tool to do=
 it).
if I have time, it will try it myself and post the instructions.


> However, now df shows 4G as the fs size, which is as expected.
>
> Log:
> --------------------------------
> --------------------------------
> --------------------------------
> $ dd if=3D/dev/zero of=3Da.img bs=3D4K count=3D1024K
> 1048576+0 records in
> 1048576+0 records out
> 4294967296 bytes (4.3 GB) copied, 14.2708 s, 301 MB/s
>
> $ mkfs.ext4 -O ^has_journal,flex_bg -G 32 -E resize=3D4G -b 4096 a.im=
g 262144
> mke2fs 1.42-WIP (02-Jul-2011)
> a.img is not a block special device.
> Proceed anyway? (y,n) y
> Filesystem label=3D
> OS type: Linux
> Block size=3D4096 (log=3D2)
> Fragment size=3D4096 (log=3D2)
> Stride=3D0 blocks, Stripe width=3D0 blocks
> 65536 inodes, 262144 blocks
> 13107 blocks (5.00%) reserved for the super user
> First data block=3D0
> Maximum filesystem blocks=3D268435456
> 8 block groups
> 32768 blocks per group, 32768 fragments per group
> 8192 inodes per group
> Superblock backups stored on blocks:
> =A0 =A0 =A0 =A032768, 98304, 163840, 229376
>
> Allocating group tables: done
> Writing inode tables: done
> Writing superblocks and filesystem accounting information: done
>
> This filesystem will be automatically checked every 0 mounts or
> 0 days, whichever comes first. =A0Use tune2fs -c or -i to override.
>
> $ sudo mount -t ext4 -o loop a.img /mnt/
>
> $ cp -a /usr/src/* /mnt/
>
> $ sudo resize2fs /dev/loop0
> resize2fs 1.42-WIP (02-Jul-2011)
> Filesystem at /dev/loop0 is mounted on /mnt; on-line resizing require=
d
> old desc_blocks =3D 1, new_desc_blocks =3D 1
> Performing an on-line resize of /dev/loop0 to 1048576 (4k) blocks.
> The filesystem on /dev/loop0 is now 1048576 blocks long.
>
> $ sudo tune2fs -O has_journal /dev/loop0
> tune2fs 1.42-WIP (02-Jul-2011)
> Creating journal inode: done
> This filesystem will be automatically checked every 20 mounts or
> 0 days, whichever comes first. =A0Use tune2fs -c or -i to override.
>
> $ sudo umount /mnt
>
> $ dumpe2fs a.img
> dumpe2fs 1.42-WIP (02-Jul-2011)
> Filesystem volume name: =A0 <none>
> Last mounted on: =A0 =A0 =A0 =A0 =A0/mnt
> Filesystem UUID: =A0 =A0 =A0 =A0 =A0f5a32b70-423d-448a-9550-90d67ff8b=
247
> Filesystem magic number: =A00xEF53
> Filesystem revision #: =A0 =A01 (dynamic)
> Filesystem features: =A0 =A0 =A0has_journal ext_attr resize_inode dir=
_index filetype extent flex_bg sparse_super large_file huge_file uninit=
_bg dir_nlink extra_isize
> Filesystem flags: =A0 =A0 =A0 =A0 signed_directory_hash
> Default mount options: =A0 =A0user_xattr acl
> Filesystem state: =A0 =A0 =A0 =A0 clean
> Errors behavior: =A0 =A0 =A0 =A0 =A0Continue
> Filesystem OS type: =A0 =A0 =A0 Linux
> Inode count: =A0 =A0 =A0 =A0 =A0 =A0 =A0262144
> Block count: =A0 =A0 =A0 =A0 =A0 =A0 =A01048576
> Reserved block count: =A0 =A0 52419
> Free blocks: =A0 =A0 =A0 =A0 =A0 =A0 =A0975516
> Free inodes: =A0 =A0 =A0 =A0 =A0 =A0 =A0241279
> First block: =A0 =A0 =A0 =A0 =A0 =A0 =A00
> Block size: =A0 =A0 =A0 =A0 =A0 =A0 =A0 4096
> Fragment size: =A0 =A0 =A0 =A0 =A0 =A04096
> Reserved GDT blocks: =A0 =A0 =A063
> Blocks per group: =A0 =A0 =A0 =A0 32768
> Fragments per group: =A0 =A0 =A032768
> Inodes per group: =A0 =A0 =A0 =A0 8192
> Inode blocks per group: =A0 512
> Flex block group size: =A0 =A032
> Filesystem created: =A0 =A0 =A0 Tue Aug =A02 14:55:16 2011
> Last mount time: =A0 =A0 =A0 =A0 =A0Tue Aug =A02 14:55:24 2011
> Last write time: =A0 =A0 =A0 =A0 =A0Tue Aug =A02 15:33:06 2011
> Mount count: =A0 =A0 =A0 =A0 =A0 =A0 =A01
> Maximum mount count: =A0 =A0 =A020
> Last checked: =A0 =A0 =A0 =A0 =A0 =A0 Tue Aug =A02 14:55:16 2011
> Check interval: =A0 =A0 =A0 =A0 =A0 0 (<none>)
> Lifetime writes: =A0 =A0 =A0 =A0 =A0406 kB
> Reserved blocks uid: =A0 =A0 =A00 (user root)
> Reserved blocks gid: =A0 =A0 =A00 (group root)
> First inode: =A0 =A0 =A0 =A0 =A0 =A0 =A011
> Inode size: =A0 =A0 =A0 =A0 =A0 =A0 =A0 256
> Required extra isize: =A0 =A0 28
> Desired extra isize: =A0 =A0 =A028
> Journal inode: =A0 =A0 =A0 =A0 =A0 =A020500
> Default directory hash: =A0 half_md4
> Directory Hash Seed: =A0 =A0 =A06aa182f8-2ce9-4b90-9138-51b2fcf09ff0
> Journal features: =A0 =A0 =A0 =A0 (none)
> Journal size: =A0 =A0 =A0 =A0 =A0 =A0 128M
> Journal length: =A0 =A0 =A0 =A0 =A0 32768
> Journal sequence: =A0 =A0 =A0 =A0 0x00000001
> Journal start: =A0 =A0 =A0 =A0 =A0 =A00
>
>
> Group 0: (Blocks 0-32767) [ITABLE_ZEROED]
> =A0Checksum 0x6170, unused inodes 0
> =A0Primary superblock at 0, Group descriptors at 1-1
> =A0Reserved GDT blocks at 2-64
> =A0Block bitmap at 65 (+65), Inode bitmap at 97 (+97)
> =A0Inode table at 129-640 (+129)
> =A024746 free blocks, 0 free inodes, 3 directories
> =A0Free blocks: 8022-32767
> =A0Free inodes:
> Group 1: (Blocks 32768-65535) [ITABLE_ZEROED]
> =A0Checksum 0x4df3, unused inodes 0
> =A0Backup superblock at 32768, Group descriptors at 32769-32769
> =A0Reserved GDT blocks at 32770-32832
> =A0Block bitmap at 66 (bg #0 + 66), Inode bitmap at 98 (bg #0 + 98)
> =A0Inode table at 641-1152 (bg #0 + 641)
> =A09128 free blocks, 0 free inodes, 975 directories
> =A0Free blocks: 49152-57343, 60376-60383, 60512-61439
> =A0Free inodes:
> Group 2: (Blocks 65536-98303) [ITABLE_ZEROED]
> =A0Checksum 0x7b0d, unused inodes 4076
> =A0Block bitmap at 67 (bg #0 + 67), Inode bitmap at 99 (bg #0 + 99)
> =A0Inode table at 1153-1664 (bg #0 + 1153)
> =A04096 free blocks, 4076 free inodes, 2302 directories, 4076 unused =
inodes
> =A0Free blocks: 94208-98303
> =A0Free inodes: 20501-24576
> Group 3: (Blocks 98304-131071) [ITABLE_ZEROED]
> =A0Checksum 0x69b9, unused inodes 7865
> =A0Backup superblock at 98304, Group descriptors at 98305-98305
> =A0Reserved GDT blocks at 98306-98368
> =A0Block bitmap at 68 (bg #0 + 68), Inode bitmap at 100 (bg #0 + 100)
> =A0Inode table at 1665-2176 (bg #0 + 1665)
> =A032703 free blocks, 7865 free inodes, 327 directories, 7865 unused =
inodes
> =A0Free blocks: 98369-131071
> =A0Free inodes: 24904-32768
> Group 4: (Blocks 131072-163839) [ITABLE_ZEROED]
> =A0Checksum 0x12e8, unused inodes 8154
> =A0Block bitmap at 69 (bg #0 + 69), Inode bitmap at 101 (bg #0 + 101)
> =A0Inode table at 2177-2688 (bg #0 + 2177)
> =A032768 free blocks, 8154 free inodes, 38 directories, 8154 unused i=
nodes
> =A0Free blocks: 131072-163839
> =A0Free inodes: 32807-40960
> Group 5: (Blocks 163840-196607) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0xe3c3, unused inodes 8192
> =A0Backup superblock at 163840, Group descriptors at 163841-163841
> =A0Reserved GDT blocks at 163842-163904
> =A0Block bitmap at 70 (bg #0 + 70), Inode bitmap at 102 (bg #0 + 102)
> =A0Inode table at 2689-3200 (bg #0 + 2689)
> =A032703 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 163905-196607
> =A0Free inodes: 40961-49152
> Group 6: (Blocks 196608-229375) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_Z=
EROED]
> =A0Checksum 0xaac1, unused inodes 8192
> =A0Block bitmap at 71 (bg #0 + 71), Inode bitmap at 103 (bg #0 + 103)
> =A0Inode table at 3201-3712 (bg #0 + 3201)
> =A032768 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 196608-229375
> =A0Free inodes: 49153-57344
> Group 7: (Blocks 229376-262143) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0xa250, unused inodes 8192
> =A0Backup superblock at 229376, Group descriptors at 229377-229377
> =A0Reserved GDT blocks at 229378-229440
> =A0Block bitmap at 72 (bg #0 + 72), Inode bitmap at 104 (bg #0 + 104)
> =A0Inode table at 3713-4224 (bg #0 + 3713)
> =A032703 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 229441-262143
> =A0Free inodes: 57345-65536
> Group 8: (Blocks 262144-294911) [ITABLE_ZEROED]
> =A0Checksum 0x99e5, unused inodes 0
> =A0Block bitmap at 262144 (+0), Inode bitmap at 262145 (+1)
> =A0Inode table at 262146-262657 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 262658-294911
> =A0Free inodes: 65537-73728
> Group 9: (Blocks 294912-327679) [ITABLE_ZEROED]
> =A0Checksum 0xf08a, unused inodes 0
> =A0Backup superblock at 294912, Group descriptors at 294913-294913
> =A0Reserved GDT blocks at 294914-294976
> =A0Block bitmap at 294977 (+65), Inode bitmap at 294978 (+66)
> =A0Inode table at 294979-295490 (+67)
> =A032189 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 295491-327679
> =A0Free inodes: 73729-81920
> Group 10: (Blocks 327680-360447) [ITABLE_ZEROED]
> =A0Checksum 0xc787, unused inodes 0
> =A0Block bitmap at 327680 (+0), Inode bitmap at 327681 (+1)
> =A0Inode table at 327682-328193 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 328194-360447
> =A0Free inodes: 81921-90112
> Group 11: (Blocks 360448-393215) [ITABLE_ZEROED]
> =A0Checksum 0xe8b6, unused inodes 0
> =A0Block bitmap at 360448 (+0), Inode bitmap at 360449 (+1)
> =A0Inode table at 360450-360961 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 360962-393215
> =A0Free inodes: 90113-98304
> Group 12: (Blocks 393216-425983) [ITABLE_ZEROED]
> =A0Checksum 0x2521, unused inodes 0
> =A0Block bitmap at 393216 (+0), Inode bitmap at 393217 (+1)
> =A0Inode table at 393218-393729 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 393730-425983
> =A0Free inodes: 98305-106496
> Group 13: (Blocks 425984-458751) [ITABLE_ZEROED]
> =A0Checksum 0x0a10, unused inodes 0
> =A0Block bitmap at 425984 (+0), Inode bitmap at 425985 (+1)
> =A0Inode table at 425986-426497 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 426498-458751
> =A0Free inodes: 106497-114688
> Group 14: (Blocks 458752-491519) [ITABLE_ZEROED]
> =A0Checksum 0x7b43, unused inodes 0
> =A0Block bitmap at 458752 (+0), Inode bitmap at 458753 (+1)
> =A0Inode table at 458754-459265 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 459266-491519
> =A0Free inodes: 114689-122880
> Group 15: (Blocks 491520-524287) [ITABLE_ZEROED]
> =A0Checksum 0x5472, unused inodes 0
> =A0Block bitmap at 491520 (+0), Inode bitmap at 491521 (+1)
> =A0Inode table at 491522-492033 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 492034-524287
> =A0Free inodes: 122881-131072
> Group 16: (Blocks 524288-557055) [ITABLE_ZEROED]
> =A0Checksum 0xd378, unused inodes 0
> =A0Block bitmap at 524288 (+0), Inode bitmap at 524289 (+1)
> =A0Inode table at 524290-524801 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 524802-557055
> =A0Free inodes: 131073-139264
> Group 17: (Blocks 557056-589823) [ITABLE_ZEROED]
> =A0Checksum 0xfc49, unused inodes 0
> =A0Block bitmap at 557056 (+0), Inode bitmap at 557057 (+1)
> =A0Inode table at 557058-557569 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 557570-589823
> =A0Free inodes: 139265-147456
> Group 18: (Blocks 589824-622591) [ITABLE_ZEROED]
> =A0Checksum 0x8d1a, unused inodes 0
> =A0Block bitmap at 589824 (+0), Inode bitmap at 589825 (+1)
> =A0Inode table at 589826-590337 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 590338-622591
> =A0Free inodes: 147457-155648
> Group 19: (Blocks 622592-655359) [ITABLE_ZEROED]
> =A0Checksum 0xa22b, unused inodes 0
> =A0Block bitmap at 622592 (+0), Inode bitmap at 622593 (+1)
> =A0Inode table at 622594-623105 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 623106-655359
> =A0Free inodes: 155649-163840
> Group 20: (Blocks 655360-688127) [ITABLE_ZEROED]
> =A0Checksum 0x6fbc, unused inodes 0
> =A0Block bitmap at 655360 (+0), Inode bitmap at 655361 (+1)
> =A0Inode table at 655362-655873 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 655874-688127
> =A0Free inodes: 163841-172032
> Group 21: (Blocks 688128-720895) [ITABLE_ZEROED]
> =A0Checksum 0x408d, unused inodes 0
> =A0Block bitmap at 688128 (+0), Inode bitmap at 688129 (+1)
> =A0Inode table at 688130-688641 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 688642-720895
> =A0Free inodes: 172033-180224
> Group 22: (Blocks 720896-753663) [ITABLE_ZEROED]
> =A0Checksum 0x31de, unused inodes 0
> =A0Block bitmap at 720896 (+0), Inode bitmap at 720897 (+1)
> =A0Inode table at 720898-721409 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 721410-753663
> =A0Free inodes: 180225-188416
> Group 23: (Blocks 753664-786431) [ITABLE_ZEROED]
> =A0Checksum 0x1eef, unused inodes 0
> =A0Block bitmap at 753664 (+0), Inode bitmap at 753665 (+1)
> =A0Inode table at 753666-754177 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 754178-786431
> =A0Free inodes: 188417-196608
> Group 24: (Blocks 786432-819199) [ITABLE_ZEROED]
> =A0Checksum 0xeaf3, unused inodes 0
> =A0Block bitmap at 786432 (+0), Inode bitmap at 786433 (+1)
> =A0Inode table at 786434-786945 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 786946-819199
> =A0Free inodes: 196609-204800
> Group 25: (Blocks 819200-851967) [ITABLE_ZEROED]
> =A0Checksum 0x839c, unused inodes 0
> =A0Backup superblock at 819200, Group descriptors at 819201-819201
> =A0Reserved GDT blocks at 819202-819264
> =A0Block bitmap at 819265 (+65), Inode bitmap at 819266 (+66)
> =A0Inode table at 819267-819778 (+67)
> =A032189 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 819779-851967
> =A0Free inodes: 204801-212992
> Group 26: (Blocks 851968-884735) [ITABLE_ZEROED]
> =A0Checksum 0xb491, unused inodes 0
> =A0Block bitmap at 851968 (+0), Inode bitmap at 851969 (+1)
> =A0Inode table at 851970-852481 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 852482-884735
> =A0Free inodes: 212993-221184
> Group 27: (Blocks 884736-917503) [ITABLE_ZEROED]
> =A0Checksum 0xddfe, unused inodes 0
> =A0Backup superblock at 884736, Group descriptors at 884737-884737
> =A0Reserved GDT blocks at 884738-884800
> =A0Block bitmap at 884801 (+65), Inode bitmap at 884802 (+66)
> =A0Inode table at 884803-885314 (+67)
> =A032189 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 885315-917503
> =A0Free inodes: 221185-229376
> Group 28: (Blocks 917504-950271) [ITABLE_ZEROED]
> =A0Checksum 0x5637, unused inodes 0
> =A0Block bitmap at 917504 (+0), Inode bitmap at 917505 (+1)
> =A0Inode table at 917506-918017 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 918018-950271
> =A0Free inodes: 229377-237568
> Group 29: (Blocks 950272-983039) [ITABLE_ZEROED]
> =A0Checksum 0x7906, unused inodes 0
> =A0Block bitmap at 950272 (+0), Inode bitmap at 950273 (+1)
> =A0Inode table at 950274-950785 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 950786-983039
> =A0Free inodes: 237569-245760
> Group 30: (Blocks 983040-1015807) [ITABLE_ZEROED]
> =A0Checksum 0x0855, unused inodes 0
> =A0Block bitmap at 983040 (+0), Inode bitmap at 983041 (+1)
> =A0Inode table at 983042-983553 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 983554-1015807
> =A0Free inodes: 245761-253952
> Group 31: (Blocks 1015808-1048575) [ITABLE_ZEROED]
> =A0Checksum 0x2764, unused inodes 0
> =A0Block bitmap at 1015808 (+0), Inode bitmap at 1015809 (+1)
> =A0Inode table at 1015810-1016321 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> =A0Free blocks: 1016322-1048575
> =A0Free inodes: 253953-262144
>
> $ truncate -s 1G a.img
>
> $ dumpe2fs a.img
> dumpe2fs 1.42-WIP (02-Jul-2011)
> Filesystem volume name: =A0 <none>
> Last mounted on: =A0 =A0 =A0 =A0 =A0/mnt
> Filesystem UUID: =A0 =A0 =A0 =A0 =A0f5a32b70-423d-448a-9550-90d67ff8b=
247
> Filesystem magic number: =A00xEF53
> Filesystem revision #: =A0 =A01 (dynamic)
> Filesystem features: =A0 =A0 =A0has_journal ext_attr resize_inode dir=
_index filetype extent flex_bg sparse_super large_file huge_file uninit=
_bg dir_nlink extra_isize
> Filesystem flags: =A0 =A0 =A0 =A0 signed_directory_hash
> Default mount options: =A0 =A0user_xattr acl
> Filesystem state: =A0 =A0 =A0 =A0 clean
> Errors behavior: =A0 =A0 =A0 =A0 =A0Continue
> Filesystem OS type: =A0 =A0 =A0 Linux
> Inode count: =A0 =A0 =A0 =A0 =A0 =A0 =A0262144
> Block count: =A0 =A0 =A0 =A0 =A0 =A0 =A01048576
> Reserved block count: =A0 =A0 52419
> Free blocks: =A0 =A0 =A0 =A0 =A0 =A0 =A0975516
> Free inodes: =A0 =A0 =A0 =A0 =A0 =A0 =A0241279
> First block: =A0 =A0 =A0 =A0 =A0 =A0 =A00
> Block size: =A0 =A0 =A0 =A0 =A0 =A0 =A0 4096
> Fragment size: =A0 =A0 =A0 =A0 =A0 =A04096
> Reserved GDT blocks: =A0 =A0 =A063
> Blocks per group: =A0 =A0 =A0 =A0 32768
> Fragments per group: =A0 =A0 =A032768
> Inodes per group: =A0 =A0 =A0 =A0 8192
> Inode blocks per group: =A0 512
> Flex block group size: =A0 =A032
> Filesystem created: =A0 =A0 =A0 Tue Aug =A02 14:55:16 2011
> Last mount time: =A0 =A0 =A0 =A0 =A0Tue Aug =A02 14:55:24 2011
> Last write time: =A0 =A0 =A0 =A0 =A0Tue Aug =A02 15:33:06 2011
> Mount count: =A0 =A0 =A0 =A0 =A0 =A0 =A01
> Maximum mount count: =A0 =A0 =A020
> Last checked: =A0 =A0 =A0 =A0 =A0 =A0 Tue Aug =A02 14:55:16 2011
> Check interval: =A0 =A0 =A0 =A0 =A0 0 (<none>)
> Lifetime writes: =A0 =A0 =A0 =A0 =A0406 kB
> Reserved blocks uid: =A0 =A0 =A00 (user root)
> Reserved blocks gid: =A0 =A0 =A00 (group root)
> First inode: =A0 =A0 =A0 =A0 =A0 =A0 =A011
> Inode size: =A0 =A0 =A0 =A0 =A0 =A0 =A0 256
> Required extra isize: =A0 =A0 28
> Desired extra isize: =A0 =A0 =A028
> Journal inode: =A0 =A0 =A0 =A0 =A0 =A020500
> Default directory hash: =A0 half_md4
> Directory Hash Seed: =A0 =A0 =A06aa182f8-2ce9-4b90-9138-51b2fcf09ff0
> Journal features: =A0 =A0 =A0 =A0 (none)
> Journal size: =A0 =A0 =A0 =A0 =A0 =A0 128M
> Journal length: =A0 =A0 =A0 =A0 =A0 32768
> Journal sequence: =A0 =A0 =A0 =A0 0x00000001
> Journal start: =A0 =A0 =A0 =A0 =A0 =A00
>
>
> Group 0: (Blocks 0-32767) [ITABLE_ZEROED]
> =A0Checksum 0x6170, unused inodes 0
> =A0Primary superblock at 0, Group descriptors at 1-1
> =A0Reserved GDT blocks at 2-64
> =A0Block bitmap at 65 (+65), Inode bitmap at 97 (+97)
> =A0Inode table at 129-640 (+129)
> =A024746 free blocks, 0 free inodes, 3 directories
> Group 1: (Blocks 32768-65535) [ITABLE_ZEROED]
> =A0Checksum 0x4df3, unused inodes 0
> =A0Backup superblock at 32768, Group descriptors at 32769-32769
> =A0Reserved GDT blocks at 32770-32832
> =A0Block bitmap at 66 (bg #0 + 66), Inode bitmap at 98 (bg #0 + 98)
> =A0Inode table at 641-1152 (bg #0 + 641)
> =A09128 free blocks, 0 free inodes, 975 directories
> Group 2: (Blocks 65536-98303) [ITABLE_ZEROED]
> =A0Checksum 0x7b0d, unused inodes 4076
> =A0Block bitmap at 67 (bg #0 + 67), Inode bitmap at 99 (bg #0 + 99)
> =A0Inode table at 1153-1664 (bg #0 + 1153)
> =A04096 free blocks, 4076 free inodes, 2302 directories, 4076 unused =
inodes
> Group 3: (Blocks 98304-131071) [ITABLE_ZEROED]
> =A0Checksum 0x69b9, unused inodes 7865
> =A0Backup superblock at 98304, Group descriptors at 98305-98305
> =A0Reserved GDT blocks at 98306-98368
> =A0Block bitmap at 68 (bg #0 + 68), Inode bitmap at 100 (bg #0 + 100)
> =A0Inode table at 1665-2176 (bg #0 + 1665)
> =A032703 free blocks, 7865 free inodes, 327 directories, 7865 unused =
inodes
> Group 4: (Blocks 131072-163839) [ITABLE_ZEROED]
> =A0Checksum 0x12e8, unused inodes 8154
> =A0Block bitmap at 69 (bg #0 + 69), Inode bitmap at 101 (bg #0 + 101)
> =A0Inode table at 2177-2688 (bg #0 + 2177)
> =A032768 free blocks, 8154 free inodes, 38 directories, 8154 unused i=
nodes
> Group 5: (Blocks 163840-196607) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0xe3c3, unused inodes 8192
> =A0Backup superblock at 163840, Group descriptors at 163841-163841
> =A0Reserved GDT blocks at 163842-163904
> =A0Block bitmap at 70 (bg #0 + 70), Inode bitmap at 102 (bg #0 + 102)
> =A0Inode table at 2689-3200 (bg #0 + 2689)
> =A032703 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> Group 6: (Blocks 196608-229375) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_Z=
EROED]
> =A0Checksum 0xaac1, unused inodes 8192
> =A0Block bitmap at 71 (bg #0 + 71), Inode bitmap at 103 (bg #0 + 103)
> =A0Inode table at 3201-3712 (bg #0 + 3201)
> =A032768 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> Group 7: (Blocks 229376-262143) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0xa250, unused inodes 8192
> =A0Backup superblock at 229376, Group descriptors at 229377-229377
> =A0Reserved GDT blocks at 229378-229440
> =A0Block bitmap at 72 (bg #0 + 72), Inode bitmap at 104 (bg #0 + 104)
> =A0Inode table at 3713-4224 (bg #0 + 3713)
> =A032703 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> Group 8: (Blocks 262144-294911) [ITABLE_ZEROED]
> =A0Checksum 0x99e5, unused inodes 0
> =A0Block bitmap at 262144 (+0), Inode bitmap at 262145 (+1)
> =A0Inode table at 262146-262657 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 9: (Blocks 294912-327679) [ITABLE_ZEROED]
> =A0Checksum 0xf08a, unused inodes 0
> =A0Backup superblock at 294912, Group descriptors at 294913-294913
> =A0Reserved GDT blocks at 294914-294976
> =A0Block bitmap at 294977 (+65), Inode bitmap at 294978 (+66)
> =A0Inode table at 294979-295490 (+67)
> =A032189 free blocks, 8192 free inodes, 0 directories
> Group 10: (Blocks 327680-360447) [ITABLE_ZEROED]
> =A0Checksum 0xc787, unused inodes 0
> =A0Block bitmap at 327680 (+0), Inode bitmap at 327681 (+1)
> =A0Inode table at 327682-328193 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 11: (Blocks 360448-393215) [ITABLE_ZEROED]
> =A0Checksum 0xe8b6, unused inodes 0
> =A0Block bitmap at 360448 (+0), Inode bitmap at 360449 (+1)
> =A0Inode table at 360450-360961 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 12: (Blocks 393216-425983) [ITABLE_ZEROED]
> =A0Checksum 0x2521, unused inodes 0
> =A0Block bitmap at 393216 (+0), Inode bitmap at 393217 (+1)
> =A0Inode table at 393218-393729 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 13: (Blocks 425984-458751) [ITABLE_ZEROED]
> =A0Checksum 0x0a10, unused inodes 0
> =A0Block bitmap at 425984 (+0), Inode bitmap at 425985 (+1)
> =A0Inode table at 425986-426497 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 14: (Blocks 458752-491519) [ITABLE_ZEROED]
> =A0Checksum 0x7b43, unused inodes 0
> =A0Block bitmap at 458752 (+0), Inode bitmap at 458753 (+1)
> =A0Inode table at 458754-459265 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 15: (Blocks 491520-524287) [ITABLE_ZEROED]
> =A0Checksum 0x5472, unused inodes 0
> =A0Block bitmap at 491520 (+0), Inode bitmap at 491521 (+1)
> =A0Inode table at 491522-492033 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 16: (Blocks 524288-557055) [ITABLE_ZEROED]
> =A0Checksum 0xd378, unused inodes 0
> =A0Block bitmap at 524288 (+0), Inode bitmap at 524289 (+1)
> =A0Inode table at 524290-524801 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 17: (Blocks 557056-589823) [ITABLE_ZEROED]
> =A0Checksum 0xfc49, unused inodes 0
> =A0Block bitmap at 557056 (+0), Inode bitmap at 557057 (+1)
> =A0Inode table at 557058-557569 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 18: (Blocks 589824-622591) [ITABLE_ZEROED]
> =A0Checksum 0x8d1a, unused inodes 0
> =A0Block bitmap at 589824 (+0), Inode bitmap at 589825 (+1)
> =A0Inode table at 589826-590337 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 19: (Blocks 622592-655359) [ITABLE_ZEROED]
> =A0Checksum 0xa22b, unused inodes 0
> =A0Block bitmap at 622592 (+0), Inode bitmap at 622593 (+1)
> =A0Inode table at 622594-623105 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 20: (Blocks 655360-688127) [ITABLE_ZEROED]
> =A0Checksum 0x6fbc, unused inodes 0
> =A0Block bitmap at 655360 (+0), Inode bitmap at 655361 (+1)
> =A0Inode table at 655362-655873 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 21: (Blocks 688128-720895) [ITABLE_ZEROED]
> =A0Checksum 0x408d, unused inodes 0
> =A0Block bitmap at 688128 (+0), Inode bitmap at 688129 (+1)
> =A0Inode table at 688130-688641 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 22: (Blocks 720896-753663) [ITABLE_ZEROED]
> =A0Checksum 0x31de, unused inodes 0
> =A0Block bitmap at 720896 (+0), Inode bitmap at 720897 (+1)
> =A0Inode table at 720898-721409 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 23: (Blocks 753664-786431) [ITABLE_ZEROED]
> =A0Checksum 0x1eef, unused inodes 0
> =A0Block bitmap at 753664 (+0), Inode bitmap at 753665 (+1)
> =A0Inode table at 753666-754177 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 24: (Blocks 786432-819199) [ITABLE_ZEROED]
> =A0Checksum 0xeaf3, unused inodes 0
> =A0Block bitmap at 786432 (+0), Inode bitmap at 786433 (+1)
> =A0Inode table at 786434-786945 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 25: (Blocks 819200-851967) [ITABLE_ZEROED]
> =A0Checksum 0x839c, unused inodes 0
> =A0Backup superblock at 819200, Group descriptors at 819201-819201
> =A0Reserved GDT blocks at 819202-819264
> =A0Block bitmap at 819265 (+65), Inode bitmap at 819266 (+66)
> =A0Inode table at 819267-819778 (+67)
> =A032189 free blocks, 8192 free inodes, 0 directories
> Group 26: (Blocks 851968-884735) [ITABLE_ZEROED]
> =A0Checksum 0xb491, unused inodes 0
> =A0Block bitmap at 851968 (+0), Inode bitmap at 851969 (+1)
> =A0Inode table at 851970-852481 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 27: (Blocks 884736-917503) [ITABLE_ZEROED]
> =A0Checksum 0xddfe, unused inodes 0
> =A0Backup superblock at 884736, Group descriptors at 884737-884737
> =A0Reserved GDT blocks at 884738-884800
> =A0Block bitmap at 884801 (+65), Inode bitmap at 884802 (+66)
> =A0Inode table at 884803-885314 (+67)
> =A032189 free blocks, 8192 free inodes, 0 directories
> Group 28: (Blocks 917504-950271) [ITABLE_ZEROED]
> =A0Checksum 0x5637, unused inodes 0
> =A0Block bitmap at 917504 (+0), Inode bitmap at 917505 (+1)
> =A0Inode table at 917506-918017 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 29: (Blocks 950272-983039) [ITABLE_ZEROED]
> =A0Checksum 0x7906, unused inodes 0
> =A0Block bitmap at 950272 (+0), Inode bitmap at 950273 (+1)
> =A0Inode table at 950274-950785 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 30: (Blocks 983040-1015807) [ITABLE_ZEROED]
> =A0Checksum 0x0855, unused inodes 0
> =A0Block bitmap at 983040 (+0), Inode bitmap at 983041 (+1)
> =A0Inode table at 983042-983553 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
> Group 31: (Blocks 1015808-1048575) [ITABLE_ZEROED]
> =A0Checksum 0x2764, unused inodes 0
> =A0Block bitmap at 1015808 (+0), Inode bitmap at 1015809 (+1)
> =A0Inode table at 1015810-1016321 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories
>
> dumpe2fs: a.img: error reading bitmaps: Can't read an block bitmap
>
> $ truncate -s 4G a.img
>
> $ e2fsck -f a.img
> e2fsck 1.42-WIP (02-Jul-2011)
> Backing up journal inode block information.
>
> Moving journal from /.journal to hidden inode.
>
> Pass 1: Checking inodes, blocks, and sizes
> Pass 2: Checking directory structure
> Pass 3: Checking directory connectivity
> Pass 4: Checking reference counts
> Pass 5: Checking group summary information
> Block bitmap differences: =A0+(262144--262657) +(294912--295490) +(32=
7680--328193) +(360448--360961) +(393216--393729) +(425984--426497) +(4=
58752--459265) +(491520--492033) +(524288--524801) +(557056--557569) +(=
589824--590337) +(622592--623105) +(655360--655873) +(688128--688641) +=
(720896--721409) +(753664--754177) +(786432--786945) +(819200--819778) =
+(851968--852481) +(884736--885314) +(917504--918017) +(950272--950785)=
 +(983040--983553) +(1015808--1016321)
> Fix<y>? yes
>
>
> a.img: ***** FILE SYSTEM WAS MODIFIED *****
> a.img: 20864/262144 files (0.0% non-contiguous), 73060/1048576 blocks
>
> $ dumpe2fs a.img
> dumpe2fs 1.42-WIP (02-Jul-2011)
> Filesystem volume name: =A0 <none>
> Last mounted on: =A0 =A0 =A0 =A0 =A0/mnt
> Filesystem UUID: =A0 =A0 =A0 =A0 =A0f5a32b70-423d-448a-9550-90d67ff8b=
247
> Filesystem magic number: =A00xEF53
> Filesystem revision #: =A0 =A01 (dynamic)
> Filesystem features: =A0 =A0 =A0has_journal ext_attr resize_inode dir=
_index filetype extent flex_bg sparse_super large_file huge_file uninit=
_bg dir_nlink extra_isize
> Filesystem flags: =A0 =A0 =A0 =A0 signed_directory_hash
> Default mount options: =A0 =A0user_xattr acl
> Filesystem state: =A0 =A0 =A0 =A0 clean
> Errors behavior: =A0 =A0 =A0 =A0 =A0Continue
> Filesystem OS type: =A0 =A0 =A0 Linux
> Inode count: =A0 =A0 =A0 =A0 =A0 =A0 =A0262144
> Block count: =A0 =A0 =A0 =A0 =A0 =A0 =A01048576
> Reserved block count: =A0 =A0 52419
> Free blocks: =A0 =A0 =A0 =A0 =A0 =A0 =A0975516
> Free inodes: =A0 =A0 =A0 =A0 =A0 =A0 =A0241280
> First block: =A0 =A0 =A0 =A0 =A0 =A0 =A00
> Block size: =A0 =A0 =A0 =A0 =A0 =A0 =A0 4096
> Fragment size: =A0 =A0 =A0 =A0 =A0 =A04096
> Reserved GDT blocks: =A0 =A0 =A063
> Blocks per group: =A0 =A0 =A0 =A0 32768
> Fragments per group: =A0 =A0 =A032768
> Inodes per group: =A0 =A0 =A0 =A0 8192
> Inode blocks per group: =A0 512
> Flex block group size: =A0 =A032
> Filesystem created: =A0 =A0 =A0 Tue Aug =A02 14:55:16 2011
> Last mount time: =A0 =A0 =A0 =A0 =A0Tue Aug =A02 14:55:24 2011
> Last write time: =A0 =A0 =A0 =A0 =A0Tue Aug =A02 15:33:44 2011
> Mount count: =A0 =A0 =A0 =A0 =A0 =A0 =A00
> Maximum mount count: =A0 =A0 =A020
> Last checked: =A0 =A0 =A0 =A0 =A0 =A0 Tue Aug =A02 15:33:44 2011
> Check interval: =A0 =A0 =A0 =A0 =A0 0 (<none>)
> Lifetime writes: =A0 =A0 =A0 =A0 =A0566 kB
> Reserved blocks uid: =A0 =A0 =A00 (user root)
> Reserved blocks gid: =A0 =A0 =A00 (group root)
> First inode: =A0 =A0 =A0 =A0 =A0 =A0 =A011
> Inode size: =A0 =A0 =A0 =A0 =A0 =A0 =A0 256
> Required extra isize: =A0 =A0 28
> Desired extra isize: =A0 =A0 =A028
> Journal inode: =A0 =A0 =A0 =A0 =A0 =A08
> Default directory hash: =A0 half_md4
> Directory Hash Seed: =A0 =A0 =A06aa182f8-2ce9-4b90-9138-51b2fcf09ff0
> Journal backup: =A0 =A0 =A0 =A0 =A0 inode blocks
> Journal features: =A0 =A0 =A0 =A0 (none)
> Journal size: =A0 =A0 =A0 =A0 =A0 =A0 128M
> Journal length: =A0 =A0 =A0 =A0 =A0 32768
> Journal sequence: =A0 =A0 =A0 =A0 0x00000001
> Journal start: =A0 =A0 =A0 =A0 =A0 =A00
>
>
> Group 0: (Blocks 0-32767) [ITABLE_ZEROED]
> =A0Checksum 0x6170, unused inodes 0
> =A0Primary superblock at 0, Group descriptors at 1-1
> =A0Reserved GDT blocks at 2-64
> =A0Block bitmap at 65 (+65), Inode bitmap at 97 (+97)
> =A0Inode table at 129-640 (+129)
> =A024746 free blocks, 0 free inodes, 3 directories
> =A0Free blocks: 8022-32767
> =A0Free inodes:
> Group 1: (Blocks 32768-65535) [ITABLE_ZEROED]
> =A0Checksum 0x4df3, unused inodes 0
> =A0Backup superblock at 32768, Group descriptors at 32769-32769
> =A0Reserved GDT blocks at 32770-32832
> =A0Block bitmap at 66 (bg #0 + 66), Inode bitmap at 98 (bg #0 + 98)
> =A0Inode table at 641-1152 (bg #0 + 641)
> =A09128 free blocks, 0 free inodes, 975 directories
> =A0Free blocks: 49152-57343, 60376-60383, 60512-61439
> =A0Free inodes:
> Group 2: (Blocks 65536-98303) [ITABLE_ZEROED]
> =A0Checksum 0x7bcd, unused inodes 4077
> =A0Block bitmap at 67 (bg #0 + 67), Inode bitmap at 99 (bg #0 + 99)
> =A0Inode table at 1153-1664 (bg #0 + 1153)
> =A04096 free blocks, 4077 free inodes, 2302 directories, 4077 unused =
inodes
> =A0Free blocks: 94208-98303
> =A0Free inodes: 20500-24576
> Group 3: (Blocks 98304-131071) [ITABLE_ZEROED]
> =A0Checksum 0x69b9, unused inodes 7865
> =A0Backup superblock at 98304, Group descriptors at 98305-98305
> =A0Reserved GDT blocks at 98306-98368
> =A0Block bitmap at 68 (bg #0 + 68), Inode bitmap at 100 (bg #0 + 100)
> =A0Inode table at 1665-2176 (bg #0 + 1665)
> =A032703 free blocks, 7865 free inodes, 327 directories, 7865 unused =
inodes
> =A0Free blocks: 98369-131071
> =A0Free inodes: 24904-32768
> Group 4: (Blocks 131072-163839) [ITABLE_ZEROED]
> =A0Checksum 0x12e8, unused inodes 8154
> =A0Block bitmap at 69 (bg #0 + 69), Inode bitmap at 101 (bg #0 + 101)
> =A0Inode table at 2177-2688 (bg #0 + 2177)
> =A032768 free blocks, 8154 free inodes, 38 directories, 8154 unused i=
nodes
> =A0Free blocks: 131072-163839
> =A0Free inodes: 32807-40960
> Group 5: (Blocks 163840-196607) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0xe3c3, unused inodes 8192
> =A0Backup superblock at 163840, Group descriptors at 163841-163841
> =A0Reserved GDT blocks at 163842-163904
> =A0Block bitmap at 70 (bg #0 + 70), Inode bitmap at 102 (bg #0 + 102)
> =A0Inode table at 2689-3200 (bg #0 + 2689)
> =A032703 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 163905-196607
> =A0Free inodes: 40961-49152
> Group 6: (Blocks 196608-229375) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_Z=
EROED]
> =A0Checksum 0xaac1, unused inodes 8192
> =A0Block bitmap at 71 (bg #0 + 71), Inode bitmap at 103 (bg #0 + 103)
> =A0Inode table at 3201-3712 (bg #0 + 3201)
> =A032768 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 196608-229375
> =A0Free inodes: 49153-57344
> Group 7: (Blocks 229376-262143) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0xa250, unused inodes 8192
> =A0Backup superblock at 229376, Group descriptors at 229377-229377
> =A0Reserved GDT blocks at 229378-229440
> =A0Block bitmap at 72 (bg #0 + 72), Inode bitmap at 104 (bg #0 + 104)
> =A0Inode table at 3713-4224 (bg #0 + 3713)
> =A032703 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 229441-262143
> =A0Free inodes: 57345-65536
> Group 8: (Blocks 262144-294911) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0x8219, unused inodes 8192
> =A0Block bitmap at 262144 (+0), Inode bitmap at 262145 (+1)
> =A0Inode table at 262146-262657 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 262658-294911
> =A0Free inodes: 65537-73728
> Group 9: (Blocks 294912-327679) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0xeb76, unused inodes 8192
> =A0Backup superblock at 294912, Group descriptors at 294913-294913
> =A0Reserved GDT blocks at 294914-294976
> =A0Block bitmap at 294977 (+65), Inode bitmap at 294978 (+66)
> =A0Inode table at 294979-295490 (+67)
> =A032189 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 295491-327679
> =A0Free inodes: 73729-81920
> Group 10: (Blocks 327680-360447) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0xdc7b, unused inodes 8192
> =A0Block bitmap at 327680 (+0), Inode bitmap at 327681 (+1)
> =A0Inode table at 327682-328193 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 328194-360447
> =A0Free inodes: 81921-90112
> Group 11: (Blocks 360448-393215) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0xf34a, unused inodes 8192
> =A0Block bitmap at 360448 (+0), Inode bitmap at 360449 (+1)
> =A0Inode table at 360450-360961 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 360962-393215
> =A0Free inodes: 90113-98304
> Group 12: (Blocks 393216-425983) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0x3edd, unused inodes 8192
> =A0Block bitmap at 393216 (+0), Inode bitmap at 393217 (+1)
> =A0Inode table at 393218-393729 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 393730-425983
> =A0Free inodes: 98305-106496
> Group 13: (Blocks 425984-458751) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0x11ec, unused inodes 8192
> =A0Block bitmap at 425984 (+0), Inode bitmap at 425985 (+1)
> =A0Inode table at 425986-426497 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 426498-458751
> =A0Free inodes: 106497-114688
> Group 14: (Blocks 458752-491519) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0x60bf, unused inodes 8192
> =A0Block bitmap at 458752 (+0), Inode bitmap at 458753 (+1)
> =A0Inode table at 458754-459265 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 459266-491519
> =A0Free inodes: 114689-122880
> Group 15: (Blocks 491520-524287) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0x4f8e, unused inodes 8192
> =A0Block bitmap at 491520 (+0), Inode bitmap at 491521 (+1)
> =A0Inode table at 491522-492033 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 492034-524287
> =A0Free inodes: 122881-131072
> Group 16: (Blocks 524288-557055) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0xc884, unused inodes 8192
> =A0Block bitmap at 524288 (+0), Inode bitmap at 524289 (+1)
> =A0Inode table at 524290-524801 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 524802-557055
> =A0Free inodes: 131073-139264
> Group 17: (Blocks 557056-589823) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0xe7b5, unused inodes 8192
> =A0Block bitmap at 557056 (+0), Inode bitmap at 557057 (+1)
> =A0Inode table at 557058-557569 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 557570-589823
> =A0Free inodes: 139265-147456
> Group 18: (Blocks 589824-622591) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0x96e6, unused inodes 8192
> =A0Block bitmap at 589824 (+0), Inode bitmap at 589825 (+1)
> =A0Inode table at 589826-590337 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 590338-622591
> =A0Free inodes: 147457-155648
> Group 19: (Blocks 622592-655359) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0xb9d7, unused inodes 8192
> =A0Block bitmap at 622592 (+0), Inode bitmap at 622593 (+1)
> =A0Inode table at 622594-623105 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 623106-655359
> =A0Free inodes: 155649-163840
> Group 20: (Blocks 655360-688127) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0x7440, unused inodes 8192
> =A0Block bitmap at 655360 (+0), Inode bitmap at 655361 (+1)
> =A0Inode table at 655362-655873 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 655874-688127
> =A0Free inodes: 163841-172032
> Group 21: (Blocks 688128-720895) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0x5b71, unused inodes 8192
> =A0Block bitmap at 688128 (+0), Inode bitmap at 688129 (+1)
> =A0Inode table at 688130-688641 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 688642-720895
> =A0Free inodes: 172033-180224
> Group 22: (Blocks 720896-753663) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0x2a22, unused inodes 8192
> =A0Block bitmap at 720896 (+0), Inode bitmap at 720897 (+1)
> =A0Inode table at 720898-721409 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 721410-753663
> =A0Free inodes: 180225-188416
> Group 23: (Blocks 753664-786431) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0x0513, unused inodes 8192
> =A0Block bitmap at 753664 (+0), Inode bitmap at 753665 (+1)
> =A0Inode table at 753666-754177 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 754178-786431
> =A0Free inodes: 188417-196608
> Group 24: (Blocks 786432-819199) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0xf10f, unused inodes 8192
> =A0Block bitmap at 786432 (+0), Inode bitmap at 786433 (+1)
> =A0Inode table at 786434-786945 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 786946-819199
> =A0Free inodes: 196609-204800
> Group 25: (Blocks 819200-851967) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0x9860, unused inodes 8192
> =A0Backup superblock at 819200, Group descriptors at 819201-819201
> =A0Reserved GDT blocks at 819202-819264
> =A0Block bitmap at 819265 (+65), Inode bitmap at 819266 (+66)
> =A0Inode table at 819267-819778 (+67)
> =A032189 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 819779-851967
> =A0Free inodes: 204801-212992
> Group 26: (Blocks 851968-884735) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0xaf6d, unused inodes 8192
> =A0Block bitmap at 851968 (+0), Inode bitmap at 851969 (+1)
> =A0Inode table at 851970-852481 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 852482-884735
> =A0Free inodes: 212993-221184
> Group 27: (Blocks 884736-917503) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0xc602, unused inodes 8192
> =A0Backup superblock at 884736, Group descriptors at 884737-884737
> =A0Reserved GDT blocks at 884738-884800
> =A0Block bitmap at 884801 (+65), Inode bitmap at 884802 (+66)
> =A0Inode table at 884803-885314 (+67)
> =A032189 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 885315-917503
> =A0Free inodes: 221185-229376
> Group 28: (Blocks 917504-950271) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0x4dcb, unused inodes 8192
> =A0Block bitmap at 917504 (+0), Inode bitmap at 917505 (+1)
> =A0Inode table at 917506-918017 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 918018-950271
> =A0Free inodes: 229377-237568
> Group 29: (Blocks 950272-983039) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0x62fa, unused inodes 8192
> =A0Block bitmap at 950272 (+0), Inode bitmap at 950273 (+1)
> =A0Inode table at 950274-950785 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 950786-983039
> =A0Free inodes: 237569-245760
> Group 30: (Blocks 983040-1015807) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0x13a9, unused inodes 8192
> =A0Block bitmap at 983040 (+0), Inode bitmap at 983041 (+1)
> =A0Inode table at 983042-983553 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 983554-1015807
> =A0Free inodes: 245761-253952
> Group 31: (Blocks 1015808-1048575) [INODE_UNINIT, ITABLE_ZEROED]
> =A0Checksum 0x3c98, unused inodes 8192
> =A0Block bitmap at 1015808 (+0), Inode bitmap at 1015809 (+1)
> =A0Inode table at 1015810-1016321 (+2)
> =A032254 free blocks, 8192 free inodes, 0 directories, 8192 unused in=
odes
> =A0Free blocks: 1016322-1048575
> =A0Free inodes: 253953-262144
>
> $ sudo mount -t ext4 -o loop a.img /mnt/
>
> $ df
> Filesystem =A0 =A0 =A0 =A0 =A0 1K-blocks =A0 =A0 =A0Used Available Us=
e% Mounted on
> /dev/loop0 =A0 =A0 =A0 =A0 =A0 =A0 4128448 =A0 =A0226384 =A0 3692388 =
=A0 6% /mnt
>
> $ sudo umount /mnt
> --------------------------------
> --------------------------------
> --------------------------------
>
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