From: Round Robinjp Subject: Re: flashing large eMMC partitions with ext4 Date: Tue, 2 Aug 2011 15:53:34 +0900 (JST) Message-ID: <20110802065341.68045.qmail@web4211.mail.ogk.yahoo.co.jp> References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT Cc: Dilger Andreas , Ted Ts'o , "linux-ext4@vger.kernel.org" To: Goldstein Amir Return-path: Received: from web4211.mail.ogk.yahoo.co.jp ([124.83.212.31]:27965 "HELO web4211.mail.ogk.yahoo.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1751011Ab1HBGxo convert rfc822-to-8bit (ORCPT ); Tue, 2 Aug 2011 02:53:44 -0400 In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-ID: 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. I think this time I have been able to achieve what I was trying to. 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? However, now df shows 4G as the fs size, which is as expected. Log: -------------------------------- -------------------------------- -------------------------------- $ dd if=/dev/zero of=a.img bs=4K count=1024K 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=4G -b 4096 a.img 262144 mke2fs 1.42-WIP (02-Jul-2011) a.img is not a block special device. Proceed anyway? (y,n) y Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 65536 inodes, 262144 blocks 13107 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=268435456 8 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group Superblock backups stored on blocks: 32768, 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. Use 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 required old desc_blocks = 1, new_desc_blocks = 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. Use tune2fs -c or -i to override. $ sudo umount /mnt $ dumpe2fs a.img dumpe2fs 1.42-WIP (02-Jul-2011) Filesystem volume name: Last mounted on: /mnt Filesystem UUID: f5a32b70-423d-448a-9550-90d67ff8b247 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_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: signed_directory_hash Default mount options: user_xattr acl Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 262144 Block count: 1048576 Reserved block count: 52419 Free blocks: 975516 Free inodes: 241279 First block: 0 Block size: 4096 Fragment size: 4096 Reserved GDT blocks: 63 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 8192 Inode blocks per group: 512 Flex block group size: 32 Filesystem created: Tue Aug 2 14:55:16 2011 Last mount time: Tue Aug 2 14:55:24 2011 Last write time: Tue Aug 2 15:33:06 2011 Mount count: 1 Maximum mount count: 20 Last checked: Tue Aug 2 14:55:16 2011 Check interval: 0 () Lifetime writes: 406 kB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 28 Desired extra isize: 28 Journal inode: 20500 Default directory hash: half_md4 Directory Hash Seed: 6aa182f8-2ce9-4b90-9138-51b2fcf09ff0 Journal features: (none) Journal size: 128M Journal length: 32768 Journal sequence: 0x00000001 Journal start: 0 Group 0: (Blocks 0-32767) [ITABLE_ZEROED] Checksum 0x6170, unused inodes 0 Primary superblock at 0, Group descriptors at 1-1 Reserved GDT blocks at 2-64 Block bitmap at 65 (+65), Inode bitmap at 97 (+97) Inode table at 129-640 (+129) 24746 free blocks, 0 free inodes, 3 directories Free blocks: 8022-32767 Free inodes: Group 1: (Blocks 32768-65535) [ITABLE_ZEROED] Checksum 0x4df3, unused inodes 0 Backup superblock at 32768, Group descriptors at 32769-32769 Reserved GDT blocks at 32770-32832 Block bitmap at 66 (bg #0 + 66), Inode bitmap at 98 (bg #0 + 98) Inode table at 641-1152 (bg #0 + 641) 9128 free blocks, 0 free inodes, 975 directories Free blocks: 49152-57343, 60376-60383, 60512-61439 Free inodes: Group 2: (Blocks 65536-98303) [ITABLE_ZEROED] Checksum 0x7b0d, unused inodes 4076 Block bitmap at 67 (bg #0 + 67), Inode bitmap at 99 (bg #0 + 99) Inode table at 1153-1664 (bg #0 + 1153) 4096 free blocks, 4076 free inodes, 2302 directories, 4076 unused inodes Free blocks: 94208-98303 Free inodes: 20501-24576 Group 3: (Blocks 98304-131071) [ITABLE_ZEROED] Checksum 0x69b9, unused inodes 7865 Backup superblock at 98304, Group descriptors at 98305-98305 Reserved GDT blocks at 98306-98368 Block bitmap at 68 (bg #0 + 68), Inode bitmap at 100 (bg #0 + 100) Inode table at 1665-2176 (bg #0 + 1665) 32703 free blocks, 7865 free inodes, 327 directories, 7865 unused inodes Free blocks: 98369-131071 Free inodes: 24904-32768 Group 4: (Blocks 131072-163839) [ITABLE_ZEROED] Checksum 0x12e8, unused inodes 8154 Block bitmap at 69 (bg #0 + 69), Inode bitmap at 101 (bg #0 + 101) Inode table at 2177-2688 (bg #0 + 2177) 32768 free blocks, 8154 free inodes, 38 directories, 8154 unused inodes Free blocks: 131072-163839 Free inodes: 32807-40960 Group 5: (Blocks 163840-196607) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0xe3c3, unused inodes 8192 Backup superblock at 163840, Group descriptors at 163841-163841 Reserved GDT blocks at 163842-163904 Block bitmap at 70 (bg #0 + 70), Inode bitmap at 102 (bg #0 + 102) Inode table at 2689-3200 (bg #0 + 2689) 32703 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 163905-196607 Free inodes: 40961-49152 Group 6: (Blocks 196608-229375) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED] Checksum 0xaac1, unused inodes 8192 Block bitmap at 71 (bg #0 + 71), Inode bitmap at 103 (bg #0 + 103) Inode table at 3201-3712 (bg #0 + 3201) 32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 196608-229375 Free inodes: 49153-57344 Group 7: (Blocks 229376-262143) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0xa250, unused inodes 8192 Backup superblock at 229376, Group descriptors at 229377-229377 Reserved GDT blocks at 229378-229440 Block bitmap at 72 (bg #0 + 72), Inode bitmap at 104 (bg #0 + 104) Inode table at 3713-4224 (bg #0 + 3713) 32703 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 229441-262143 Free inodes: 57345-65536 Group 8: (Blocks 262144-294911) [ITABLE_ZEROED] Checksum 0x99e5, unused inodes 0 Block bitmap at 262144 (+0), Inode bitmap at 262145 (+1) Inode table at 262146-262657 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 262658-294911 Free inodes: 65537-73728 Group 9: (Blocks 294912-327679) [ITABLE_ZEROED] Checksum 0xf08a, unused inodes 0 Backup superblock at 294912, Group descriptors at 294913-294913 Reserved GDT blocks at 294914-294976 Block bitmap at 294977 (+65), Inode bitmap at 294978 (+66) Inode table at 294979-295490 (+67) 32189 free blocks, 8192 free inodes, 0 directories Free blocks: 295491-327679 Free inodes: 73729-81920 Group 10: (Blocks 327680-360447) [ITABLE_ZEROED] Checksum 0xc787, unused inodes 0 Block bitmap at 327680 (+0), Inode bitmap at 327681 (+1) Inode table at 327682-328193 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 328194-360447 Free inodes: 81921-90112 Group 11: (Blocks 360448-393215) [ITABLE_ZEROED] Checksum 0xe8b6, unused inodes 0 Block bitmap at 360448 (+0), Inode bitmap at 360449 (+1) Inode table at 360450-360961 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 360962-393215 Free inodes: 90113-98304 Group 12: (Blocks 393216-425983) [ITABLE_ZEROED] Checksum 0x2521, unused inodes 0 Block bitmap at 393216 (+0), Inode bitmap at 393217 (+1) Inode table at 393218-393729 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 393730-425983 Free inodes: 98305-106496 Group 13: (Blocks 425984-458751) [ITABLE_ZEROED] Checksum 0x0a10, unused inodes 0 Block bitmap at 425984 (+0), Inode bitmap at 425985 (+1) Inode table at 425986-426497 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 426498-458751 Free inodes: 106497-114688 Group 14: (Blocks 458752-491519) [ITABLE_ZEROED] Checksum 0x7b43, unused inodes 0 Block bitmap at 458752 (+0), Inode bitmap at 458753 (+1) Inode table at 458754-459265 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 459266-491519 Free inodes: 114689-122880 Group 15: (Blocks 491520-524287) [ITABLE_ZEROED] Checksum 0x5472, unused inodes 0 Block bitmap at 491520 (+0), Inode bitmap at 491521 (+1) Inode table at 491522-492033 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 492034-524287 Free inodes: 122881-131072 Group 16: (Blocks 524288-557055) [ITABLE_ZEROED] Checksum 0xd378, unused inodes 0 Block bitmap at 524288 (+0), Inode bitmap at 524289 (+1) Inode table at 524290-524801 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 524802-557055 Free inodes: 131073-139264 Group 17: (Blocks 557056-589823) [ITABLE_ZEROED] Checksum 0xfc49, unused inodes 0 Block bitmap at 557056 (+0), Inode bitmap at 557057 (+1) Inode table at 557058-557569 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 557570-589823 Free inodes: 139265-147456 Group 18: (Blocks 589824-622591) [ITABLE_ZEROED] Checksum 0x8d1a, unused inodes 0 Block bitmap at 589824 (+0), Inode bitmap at 589825 (+1) Inode table at 589826-590337 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 590338-622591 Free inodes: 147457-155648 Group 19: (Blocks 622592-655359) [ITABLE_ZEROED] Checksum 0xa22b, unused inodes 0 Block bitmap at 622592 (+0), Inode bitmap at 622593 (+1) Inode table at 622594-623105 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 623106-655359 Free inodes: 155649-163840 Group 20: (Blocks 655360-688127) [ITABLE_ZEROED] Checksum 0x6fbc, unused inodes 0 Block bitmap at 655360 (+0), Inode bitmap at 655361 (+1) Inode table at 655362-655873 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 655874-688127 Free inodes: 163841-172032 Group 21: (Blocks 688128-720895) [ITABLE_ZEROED] Checksum 0x408d, unused inodes 0 Block bitmap at 688128 (+0), Inode bitmap at 688129 (+1) Inode table at 688130-688641 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 688642-720895 Free inodes: 172033-180224 Group 22: (Blocks 720896-753663) [ITABLE_ZEROED] Checksum 0x31de, unused inodes 0 Block bitmap at 720896 (+0), Inode bitmap at 720897 (+1) Inode table at 720898-721409 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 721410-753663 Free inodes: 180225-188416 Group 23: (Blocks 753664-786431) [ITABLE_ZEROED] Checksum 0x1eef, unused inodes 0 Block bitmap at 753664 (+0), Inode bitmap at 753665 (+1) Inode table at 753666-754177 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 754178-786431 Free inodes: 188417-196608 Group 24: (Blocks 786432-819199) [ITABLE_ZEROED] Checksum 0xeaf3, unused inodes 0 Block bitmap at 786432 (+0), Inode bitmap at 786433 (+1) Inode table at 786434-786945 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 786946-819199 Free inodes: 196609-204800 Group 25: (Blocks 819200-851967) [ITABLE_ZEROED] Checksum 0x839c, unused inodes 0 Backup superblock at 819200, Group descriptors at 819201-819201 Reserved GDT blocks at 819202-819264 Block bitmap at 819265 (+65), Inode bitmap at 819266 (+66) Inode table at 819267-819778 (+67) 32189 free blocks, 8192 free inodes, 0 directories Free blocks: 819779-851967 Free inodes: 204801-212992 Group 26: (Blocks 851968-884735) [ITABLE_ZEROED] Checksum 0xb491, unused inodes 0 Block bitmap at 851968 (+0), Inode bitmap at 851969 (+1) Inode table at 851970-852481 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 852482-884735 Free inodes: 212993-221184 Group 27: (Blocks 884736-917503) [ITABLE_ZEROED] Checksum 0xddfe, unused inodes 0 Backup superblock at 884736, Group descriptors at 884737-884737 Reserved GDT blocks at 884738-884800 Block bitmap at 884801 (+65), Inode bitmap at 884802 (+66) Inode table at 884803-885314 (+67) 32189 free blocks, 8192 free inodes, 0 directories Free blocks: 885315-917503 Free inodes: 221185-229376 Group 28: (Blocks 917504-950271) [ITABLE_ZEROED] Checksum 0x5637, unused inodes 0 Block bitmap at 917504 (+0), Inode bitmap at 917505 (+1) Inode table at 917506-918017 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 918018-950271 Free inodes: 229377-237568 Group 29: (Blocks 950272-983039) [ITABLE_ZEROED] Checksum 0x7906, unused inodes 0 Block bitmap at 950272 (+0), Inode bitmap at 950273 (+1) Inode table at 950274-950785 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 950786-983039 Free inodes: 237569-245760 Group 30: (Blocks 983040-1015807) [ITABLE_ZEROED] Checksum 0x0855, unused inodes 0 Block bitmap at 983040 (+0), Inode bitmap at 983041 (+1) Inode table at 983042-983553 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 983554-1015807 Free inodes: 245761-253952 Group 31: (Blocks 1015808-1048575) [ITABLE_ZEROED] Checksum 0x2764, unused inodes 0 Block bitmap at 1015808 (+0), Inode bitmap at 1015809 (+1) Inode table at 1015810-1016321 (+2) 32254 free blocks, 8192 free inodes, 0 directories Free blocks: 1016322-1048575 Free inodes: 253953-262144 $ truncate -s 1G a.img $ dumpe2fs a.img dumpe2fs 1.42-WIP (02-Jul-2011) Filesystem volume name: Last mounted on: /mnt Filesystem UUID: f5a32b70-423d-448a-9550-90d67ff8b247 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_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: signed_directory_hash Default mount options: user_xattr acl Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 262144 Block count: 1048576 Reserved block count: 52419 Free blocks: 975516 Free inodes: 241279 First block: 0 Block size: 4096 Fragment size: 4096 Reserved GDT blocks: 63 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 8192 Inode blocks per group: 512 Flex block group size: 32 Filesystem created: Tue Aug 2 14:55:16 2011 Last mount time: Tue Aug 2 14:55:24 2011 Last write time: Tue Aug 2 15:33:06 2011 Mount count: 1 Maximum mount count: 20 Last checked: Tue Aug 2 14:55:16 2011 Check interval: 0 () Lifetime writes: 406 kB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 28 Desired extra isize: 28 Journal inode: 20500 Default directory hash: half_md4 Directory Hash Seed: 6aa182f8-2ce9-4b90-9138-51b2fcf09ff0 Journal features: (none) Journal size: 128M Journal length: 32768 Journal sequence: 0x00000001 Journal start: 0 Group 0: (Blocks 0-32767) [ITABLE_ZEROED] Checksum 0x6170, unused inodes 0 Primary superblock at 0, Group descriptors at 1-1 Reserved GDT blocks at 2-64 Block bitmap at 65 (+65), Inode bitmap at 97 (+97) Inode table at 129-640 (+129) 24746 free blocks, 0 free inodes, 3 directories Group 1: (Blocks 32768-65535) [ITABLE_ZEROED] Checksum 0x4df3, unused inodes 0 Backup superblock at 32768, Group descriptors at 32769-32769 Reserved GDT blocks at 32770-32832 Block bitmap at 66 (bg #0 + 66), Inode bitmap at 98 (bg #0 + 98) Inode table at 641-1152 (bg #0 + 641) 9128 free blocks, 0 free inodes, 975 directories Group 2: (Blocks 65536-98303) [ITABLE_ZEROED] Checksum 0x7b0d, unused inodes 4076 Block bitmap at 67 (bg #0 + 67), Inode bitmap at 99 (bg #0 + 99) Inode table at 1153-1664 (bg #0 + 1153) 4096 free blocks, 4076 free inodes, 2302 directories, 4076 unused inodes Group 3: (Blocks 98304-131071) [ITABLE_ZEROED] Checksum 0x69b9, unused inodes 7865 Backup superblock at 98304, Group descriptors at 98305-98305 Reserved GDT blocks at 98306-98368 Block bitmap at 68 (bg #0 + 68), Inode bitmap at 100 (bg #0 + 100) Inode table at 1665-2176 (bg #0 + 1665) 32703 free blocks, 7865 free inodes, 327 directories, 7865 unused inodes Group 4: (Blocks 131072-163839) [ITABLE_ZEROED] Checksum 0x12e8, unused inodes 8154 Block bitmap at 69 (bg #0 + 69), Inode bitmap at 101 (bg #0 + 101) Inode table at 2177-2688 (bg #0 + 2177) 32768 free blocks, 8154 free inodes, 38 directories, 8154 unused inodes Group 5: (Blocks 163840-196607) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0xe3c3, unused inodes 8192 Backup superblock at 163840, Group descriptors at 163841-163841 Reserved GDT blocks at 163842-163904 Block bitmap at 70 (bg #0 + 70), Inode bitmap at 102 (bg #0 + 102) Inode table at 2689-3200 (bg #0 + 2689) 32703 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Group 6: (Blocks 196608-229375) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED] Checksum 0xaac1, unused inodes 8192 Block bitmap at 71 (bg #0 + 71), Inode bitmap at 103 (bg #0 + 103) Inode table at 3201-3712 (bg #0 + 3201) 32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Group 7: (Blocks 229376-262143) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0xa250, unused inodes 8192 Backup superblock at 229376, Group descriptors at 229377-229377 Reserved GDT blocks at 229378-229440 Block bitmap at 72 (bg #0 + 72), Inode bitmap at 104 (bg #0 + 104) Inode table at 3713-4224 (bg #0 + 3713) 32703 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Group 8: (Blocks 262144-294911) [ITABLE_ZEROED] Checksum 0x99e5, unused inodes 0 Block bitmap at 262144 (+0), Inode bitmap at 262145 (+1) Inode table at 262146-262657 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 9: (Blocks 294912-327679) [ITABLE_ZEROED] Checksum 0xf08a, unused inodes 0 Backup superblock at 294912, Group descriptors at 294913-294913 Reserved GDT blocks at 294914-294976 Block bitmap at 294977 (+65), Inode bitmap at 294978 (+66) Inode table at 294979-295490 (+67) 32189 free blocks, 8192 free inodes, 0 directories Group 10: (Blocks 327680-360447) [ITABLE_ZEROED] Checksum 0xc787, unused inodes 0 Block bitmap at 327680 (+0), Inode bitmap at 327681 (+1) Inode table at 327682-328193 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 11: (Blocks 360448-393215) [ITABLE_ZEROED] Checksum 0xe8b6, unused inodes 0 Block bitmap at 360448 (+0), Inode bitmap at 360449 (+1) Inode table at 360450-360961 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 12: (Blocks 393216-425983) [ITABLE_ZEROED] Checksum 0x2521, unused inodes 0 Block bitmap at 393216 (+0), Inode bitmap at 393217 (+1) Inode table at 393218-393729 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 13: (Blocks 425984-458751) [ITABLE_ZEROED] Checksum 0x0a10, unused inodes 0 Block bitmap at 425984 (+0), Inode bitmap at 425985 (+1) Inode table at 425986-426497 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 14: (Blocks 458752-491519) [ITABLE_ZEROED] Checksum 0x7b43, unused inodes 0 Block bitmap at 458752 (+0), Inode bitmap at 458753 (+1) Inode table at 458754-459265 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 15: (Blocks 491520-524287) [ITABLE_ZEROED] Checksum 0x5472, unused inodes 0 Block bitmap at 491520 (+0), Inode bitmap at 491521 (+1) Inode table at 491522-492033 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 16: (Blocks 524288-557055) [ITABLE_ZEROED] Checksum 0xd378, unused inodes 0 Block bitmap at 524288 (+0), Inode bitmap at 524289 (+1) Inode table at 524290-524801 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 17: (Blocks 557056-589823) [ITABLE_ZEROED] Checksum 0xfc49, unused inodes 0 Block bitmap at 557056 (+0), Inode bitmap at 557057 (+1) Inode table at 557058-557569 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 18: (Blocks 589824-622591) [ITABLE_ZEROED] Checksum 0x8d1a, unused inodes 0 Block bitmap at 589824 (+0), Inode bitmap at 589825 (+1) Inode table at 589826-590337 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 19: (Blocks 622592-655359) [ITABLE_ZEROED] Checksum 0xa22b, unused inodes 0 Block bitmap at 622592 (+0), Inode bitmap at 622593 (+1) Inode table at 622594-623105 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 20: (Blocks 655360-688127) [ITABLE_ZEROED] Checksum 0x6fbc, unused inodes 0 Block bitmap at 655360 (+0), Inode bitmap at 655361 (+1) Inode table at 655362-655873 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 21: (Blocks 688128-720895) [ITABLE_ZEROED] Checksum 0x408d, unused inodes 0 Block bitmap at 688128 (+0), Inode bitmap at 688129 (+1) Inode table at 688130-688641 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 22: (Blocks 720896-753663) [ITABLE_ZEROED] Checksum 0x31de, unused inodes 0 Block bitmap at 720896 (+0), Inode bitmap at 720897 (+1) Inode table at 720898-721409 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 23: (Blocks 753664-786431) [ITABLE_ZEROED] Checksum 0x1eef, unused inodes 0 Block bitmap at 753664 (+0), Inode bitmap at 753665 (+1) Inode table at 753666-754177 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 24: (Blocks 786432-819199) [ITABLE_ZEROED] Checksum 0xeaf3, unused inodes 0 Block bitmap at 786432 (+0), Inode bitmap at 786433 (+1) Inode table at 786434-786945 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 25: (Blocks 819200-851967) [ITABLE_ZEROED] Checksum 0x839c, unused inodes 0 Backup superblock at 819200, Group descriptors at 819201-819201 Reserved GDT blocks at 819202-819264 Block bitmap at 819265 (+65), Inode bitmap at 819266 (+66) Inode table at 819267-819778 (+67) 32189 free blocks, 8192 free inodes, 0 directories Group 26: (Blocks 851968-884735) [ITABLE_ZEROED] Checksum 0xb491, unused inodes 0 Block bitmap at 851968 (+0), Inode bitmap at 851969 (+1) Inode table at 851970-852481 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 27: (Blocks 884736-917503) [ITABLE_ZEROED] Checksum 0xddfe, unused inodes 0 Backup superblock at 884736, Group descriptors at 884737-884737 Reserved GDT blocks at 884738-884800 Block bitmap at 884801 (+65), Inode bitmap at 884802 (+66) Inode table at 884803-885314 (+67) 32189 free blocks, 8192 free inodes, 0 directories Group 28: (Blocks 917504-950271) [ITABLE_ZEROED] Checksum 0x5637, unused inodes 0 Block bitmap at 917504 (+0), Inode bitmap at 917505 (+1) Inode table at 917506-918017 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 29: (Blocks 950272-983039) [ITABLE_ZEROED] Checksum 0x7906, unused inodes 0 Block bitmap at 950272 (+0), Inode bitmap at 950273 (+1) Inode table at 950274-950785 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 30: (Blocks 983040-1015807) [ITABLE_ZEROED] Checksum 0x0855, unused inodes 0 Block bitmap at 983040 (+0), Inode bitmap at 983041 (+1) Inode table at 983042-983553 (+2) 32254 free blocks, 8192 free inodes, 0 directories Group 31: (Blocks 1015808-1048575) [ITABLE_ZEROED] Checksum 0x2764, unused inodes 0 Block bitmap at 1015808 (+0), Inode bitmap at 1015809 (+1) Inode table at 1015810-1016321 (+2) 32254 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: +(262144--262657) +(294912--295490) +(327680--328193) +(360448--360961) +(393216--393729) +(425984--426497) +(458752--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? 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: Last mounted on: /mnt Filesystem UUID: f5a32b70-423d-448a-9550-90d67ff8b247 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_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: signed_directory_hash Default mount options: user_xattr acl Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 262144 Block count: 1048576 Reserved block count: 52419 Free blocks: 975516 Free inodes: 241280 First block: 0 Block size: 4096 Fragment size: 4096 Reserved GDT blocks: 63 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 8192 Inode blocks per group: 512 Flex block group size: 32 Filesystem created: Tue Aug 2 14:55:16 2011 Last mount time: Tue Aug 2 14:55:24 2011 Last write time: Tue Aug 2 15:33:44 2011 Mount count: 0 Maximum mount count: 20 Last checked: Tue Aug 2 15:33:44 2011 Check interval: 0 () Lifetime writes: 566 kB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 28 Desired extra isize: 28 Journal inode: 8 Default directory hash: half_md4 Directory Hash Seed: 6aa182f8-2ce9-4b90-9138-51b2fcf09ff0 Journal backup: inode blocks Journal features: (none) Journal size: 128M Journal length: 32768 Journal sequence: 0x00000001 Journal start: 0 Group 0: (Blocks 0-32767) [ITABLE_ZEROED] Checksum 0x6170, unused inodes 0 Primary superblock at 0, Group descriptors at 1-1 Reserved GDT blocks at 2-64 Block bitmap at 65 (+65), Inode bitmap at 97 (+97) Inode table at 129-640 (+129) 24746 free blocks, 0 free inodes, 3 directories Free blocks: 8022-32767 Free inodes: Group 1: (Blocks 32768-65535) [ITABLE_ZEROED] Checksum 0x4df3, unused inodes 0 Backup superblock at 32768, Group descriptors at 32769-32769 Reserved GDT blocks at 32770-32832 Block bitmap at 66 (bg #0 + 66), Inode bitmap at 98 (bg #0 + 98) Inode table at 641-1152 (bg #0 + 641) 9128 free blocks, 0 free inodes, 975 directories Free blocks: 49152-57343, 60376-60383, 60512-61439 Free inodes: Group 2: (Blocks 65536-98303) [ITABLE_ZEROED] Checksum 0x7bcd, unused inodes 4077 Block bitmap at 67 (bg #0 + 67), Inode bitmap at 99 (bg #0 + 99) Inode table at 1153-1664 (bg #0 + 1153) 4096 free blocks, 4077 free inodes, 2302 directories, 4077 unused inodes Free blocks: 94208-98303 Free inodes: 20500-24576 Group 3: (Blocks 98304-131071) [ITABLE_ZEROED] Checksum 0x69b9, unused inodes 7865 Backup superblock at 98304, Group descriptors at 98305-98305 Reserved GDT blocks at 98306-98368 Block bitmap at 68 (bg #0 + 68), Inode bitmap at 100 (bg #0 + 100) Inode table at 1665-2176 (bg #0 + 1665) 32703 free blocks, 7865 free inodes, 327 directories, 7865 unused inodes Free blocks: 98369-131071 Free inodes: 24904-32768 Group 4: (Blocks 131072-163839) [ITABLE_ZEROED] Checksum 0x12e8, unused inodes 8154 Block bitmap at 69 (bg #0 + 69), Inode bitmap at 101 (bg #0 + 101) Inode table at 2177-2688 (bg #0 + 2177) 32768 free blocks, 8154 free inodes, 38 directories, 8154 unused inodes Free blocks: 131072-163839 Free inodes: 32807-40960 Group 5: (Blocks 163840-196607) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0xe3c3, unused inodes 8192 Backup superblock at 163840, Group descriptors at 163841-163841 Reserved GDT blocks at 163842-163904 Block bitmap at 70 (bg #0 + 70), Inode bitmap at 102 (bg #0 + 102) Inode table at 2689-3200 (bg #0 + 2689) 32703 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 163905-196607 Free inodes: 40961-49152 Group 6: (Blocks 196608-229375) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED] Checksum 0xaac1, unused inodes 8192 Block bitmap at 71 (bg #0 + 71), Inode bitmap at 103 (bg #0 + 103) Inode table at 3201-3712 (bg #0 + 3201) 32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 196608-229375 Free inodes: 49153-57344 Group 7: (Blocks 229376-262143) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0xa250, unused inodes 8192 Backup superblock at 229376, Group descriptors at 229377-229377 Reserved GDT blocks at 229378-229440 Block bitmap at 72 (bg #0 + 72), Inode bitmap at 104 (bg #0 + 104) Inode table at 3713-4224 (bg #0 + 3713) 32703 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 229441-262143 Free inodes: 57345-65536 Group 8: (Blocks 262144-294911) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x8219, unused inodes 8192 Block bitmap at 262144 (+0), Inode bitmap at 262145 (+1) Inode table at 262146-262657 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 262658-294911 Free inodes: 65537-73728 Group 9: (Blocks 294912-327679) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0xeb76, unused inodes 8192 Backup superblock at 294912, Group descriptors at 294913-294913 Reserved GDT blocks at 294914-294976 Block bitmap at 294977 (+65), Inode bitmap at 294978 (+66) Inode table at 294979-295490 (+67) 32189 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 295491-327679 Free inodes: 73729-81920 Group 10: (Blocks 327680-360447) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0xdc7b, unused inodes 8192 Block bitmap at 327680 (+0), Inode bitmap at 327681 (+1) Inode table at 327682-328193 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 328194-360447 Free inodes: 81921-90112 Group 11: (Blocks 360448-393215) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0xf34a, unused inodes 8192 Block bitmap at 360448 (+0), Inode bitmap at 360449 (+1) Inode table at 360450-360961 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 360962-393215 Free inodes: 90113-98304 Group 12: (Blocks 393216-425983) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x3edd, unused inodes 8192 Block bitmap at 393216 (+0), Inode bitmap at 393217 (+1) Inode table at 393218-393729 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 393730-425983 Free inodes: 98305-106496 Group 13: (Blocks 425984-458751) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x11ec, unused inodes 8192 Block bitmap at 425984 (+0), Inode bitmap at 425985 (+1) Inode table at 425986-426497 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 426498-458751 Free inodes: 106497-114688 Group 14: (Blocks 458752-491519) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x60bf, unused inodes 8192 Block bitmap at 458752 (+0), Inode bitmap at 458753 (+1) Inode table at 458754-459265 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 459266-491519 Free inodes: 114689-122880 Group 15: (Blocks 491520-524287) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x4f8e, unused inodes 8192 Block bitmap at 491520 (+0), Inode bitmap at 491521 (+1) Inode table at 491522-492033 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 492034-524287 Free inodes: 122881-131072 Group 16: (Blocks 524288-557055) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0xc884, unused inodes 8192 Block bitmap at 524288 (+0), Inode bitmap at 524289 (+1) Inode table at 524290-524801 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 524802-557055 Free inodes: 131073-139264 Group 17: (Blocks 557056-589823) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0xe7b5, unused inodes 8192 Block bitmap at 557056 (+0), Inode bitmap at 557057 (+1) Inode table at 557058-557569 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 557570-589823 Free inodes: 139265-147456 Group 18: (Blocks 589824-622591) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x96e6, unused inodes 8192 Block bitmap at 589824 (+0), Inode bitmap at 589825 (+1) Inode table at 589826-590337 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 590338-622591 Free inodes: 147457-155648 Group 19: (Blocks 622592-655359) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0xb9d7, unused inodes 8192 Block bitmap at 622592 (+0), Inode bitmap at 622593 (+1) Inode table at 622594-623105 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 623106-655359 Free inodes: 155649-163840 Group 20: (Blocks 655360-688127) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x7440, unused inodes 8192 Block bitmap at 655360 (+0), Inode bitmap at 655361 (+1) Inode table at 655362-655873 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 655874-688127 Free inodes: 163841-172032 Group 21: (Blocks 688128-720895) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x5b71, unused inodes 8192 Block bitmap at 688128 (+0), Inode bitmap at 688129 (+1) Inode table at 688130-688641 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 688642-720895 Free inodes: 172033-180224 Group 22: (Blocks 720896-753663) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x2a22, unused inodes 8192 Block bitmap at 720896 (+0), Inode bitmap at 720897 (+1) Inode table at 720898-721409 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 721410-753663 Free inodes: 180225-188416 Group 23: (Blocks 753664-786431) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x0513, unused inodes 8192 Block bitmap at 753664 (+0), Inode bitmap at 753665 (+1) Inode table at 753666-754177 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 754178-786431 Free inodes: 188417-196608 Group 24: (Blocks 786432-819199) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0xf10f, unused inodes 8192 Block bitmap at 786432 (+0), Inode bitmap at 786433 (+1) Inode table at 786434-786945 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 786946-819199 Free inodes: 196609-204800 Group 25: (Blocks 819200-851967) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x9860, unused inodes 8192 Backup superblock at 819200, Group descriptors at 819201-819201 Reserved GDT blocks at 819202-819264 Block bitmap at 819265 (+65), Inode bitmap at 819266 (+66) Inode table at 819267-819778 (+67) 32189 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 819779-851967 Free inodes: 204801-212992 Group 26: (Blocks 851968-884735) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0xaf6d, unused inodes 8192 Block bitmap at 851968 (+0), Inode bitmap at 851969 (+1) Inode table at 851970-852481 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 852482-884735 Free inodes: 212993-221184 Group 27: (Blocks 884736-917503) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0xc602, unused inodes 8192 Backup superblock at 884736, Group descriptors at 884737-884737 Reserved GDT blocks at 884738-884800 Block bitmap at 884801 (+65), Inode bitmap at 884802 (+66) Inode table at 884803-885314 (+67) 32189 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 885315-917503 Free inodes: 221185-229376 Group 28: (Blocks 917504-950271) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x4dcb, unused inodes 8192 Block bitmap at 917504 (+0), Inode bitmap at 917505 (+1) Inode table at 917506-918017 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 918018-950271 Free inodes: 229377-237568 Group 29: (Blocks 950272-983039) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x62fa, unused inodes 8192 Block bitmap at 950272 (+0), Inode bitmap at 950273 (+1) Inode table at 950274-950785 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 950786-983039 Free inodes: 237569-245760 Group 30: (Blocks 983040-1015807) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x13a9, unused inodes 8192 Block bitmap at 983040 (+0), Inode bitmap at 983041 (+1) Inode table at 983042-983553 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 983554-1015807 Free inodes: 245761-253952 Group 31: (Blocks 1015808-1048575) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x3c98, unused inodes 8192 Block bitmap at 1015808 (+0), Inode bitmap at 1015809 (+1) Inode table at 1015810-1016321 (+2) 32254 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes Free blocks: 1016322-1048575 Free inodes: 253953-262144 $ sudo mount -t ext4 -o loop a.img /mnt/ $ df Filesystem 1K-blocks Used Available Use% Mounted on /dev/loop0 4128448 226384 3692388 6% /mnt $ sudo umount /mnt -------------------------------- -------------------------------- --------------------------------