Re: [Qemu-devel] help with understanding qcow2 file format
hi，I have read 2015-qcow2-expanded.pdf and qcow2.txt， so I understand how to convert the offset in the virtual disk to the offset into the image file（qcow2). but I wish to know how to convert the block using ext4 to the offset in the virtual disk. Please help me. the file block information is below: cloud@cloud-pc:$ sudo debugfs /dev/vda1 debugfs: blocks /home/cloud/test 347008 cloud@cloud-pc:$ stat /home/cloud/test File: /home/cloud/test size:8 Blocks:8 IO Block:4096 regular file Device: fd01h/64769d Inode:131601 Links:1 OS' file system information is below: (ubuntu 14.04, ext4) cloud@cloud-pc:$ fdisk -l Disk /dev/vda: 8589 MB, 8589934592 bytes 16 heads, 63 sectors/track, 16644 cylinders, total 16777216 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: 0x05f4 Device Boot Start End Blocks Id System /dev/vda1 *204812582911 6290432 83 Linux /dev/vda21258495816775167 20951055 Extended /dev/vda51258496016775167 2095104 82 Linux swap / Solaris cloud@cloud-pc:$ dumpe2fs -h /dev/vad1 Filesystem volume name: Last mounted on: / Filesystem UUID: bbcbbb0e-a335-46fe-b829-b4bf7bef513b Filesystem magic number: 0xEF53 Filesystem revision #:1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery 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: 393216 Block count: 1572608 Reserved block count: 78630 Free blocks: 716304 Free inodes: 215296 First block: 0 Block size: 4096 Fragment size:4096 Reserved GDT blocks: 383 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 8192 Inode blocks per group: 512 Flex block group size:16 Filesystem created: Thu Jan 21 14:42:55 2016 Last mount time: Fri Jan 29 21:25:03 2016 Last write time: Fri Jan 29 21:25:03 2016 Mount count: 7 Maximum mount count: -1 Last checked: Thu Jan 21 14:42:55 2016 Check interval: 0 () Lifetime writes: 4221 MB 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 First orphan inode: 131699 Default directory hash: half_md4 Directory Hash Seed: 475ee556-9a7f-4c7b-93c3-21249906efea Journal backup: inode blocks Journal features: journal_incompat_revoke Journal size: 128M Journal length: 32768 Journal sequence: 0x0dc8 Journal start:18 cloud@cloud-pc:$ cat /etc/fstab # /etc/fstab: static file system information. # # / was on /dev/vda1 during installation UUID=bbcbbb0e-a335-46fe-b829-b4bf7bef513b / ext4errors=remount-ro 0 1 # swap was on /dev/vda5 during installation UUID=e2e3ec5c-dc4c-4f5d-a176-0f166b419785 none swap sw 0 0
[Qemu-devel] how to convert the file block using ext4 to the offset in the virtual disk
hi，I have read 2015-qcow2-expanded.pdf and qcow2.txt， so I understand how to convert the offset in the virtual disk to the offset into the image file（qcow2). but I wish to know how to convert the file block(347008) using ext4 to the offset in the virtual disk. Please help me. the file block information is below: cloud cloud-pc:$ sudo debugfs /dev/vda1 debugfs: blocks /home/cloud/test 347008 cloud cloud-pc:$ stat /home/cloud/test File: /home/cloud/test size:8 Blocks:8 IO Block:4096 regular file Device: fd01h/64769d Inode:131601 Links:1 OS' file system information is below: (ubuntu 14.04, ext4) cloud cloud-pc:$ fdisk -l Disk /dev/vda: 8589 MB, 8589934592 bytes 16 heads, 63 sectors/track, 16644 cylinders, total 16777216 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: 0x05f4 Device Boot Start End Blocks Id System /dev/vda1 *204812582911 6290432 83 Linux /dev/vda21258495816775167 20951055 Extended /dev/vda51258496016775167 2095104 82 Linux swap / Solaris cloud cloud-pc:$ dumpe2fs -h /dev/vad1 Filesystem volume name: Last mounted on: / Filesystem UUID: bbcbbb0e-a335-46fe-b829-b4bf7bef513b Filesystem magic number: 0xEF53 Filesystem revision #:1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery 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: 393216 Block count: 1572608 Reserved block count: 78630 Free blocks: 716304 Free inodes: 215296 First block: 0 Block size: 4096 Fragment size:4096 Reserved GDT blocks: 383 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 8192 Inode blocks per group: 512 Flex block group size:16 Filesystem created: Thu Jan 21 14:42:55 2016 Last mount time: Fri Jan 29 21:25:03 2016 Last write time: Fri Jan 29 21:25:03 2016 Mount count: 7 Maximum mount count: -1 Last checked: Thu Jan 21 14:42:55 2016 Check interval: 0 () Lifetime writes: 4221 MB 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 First orphan inode: 131699 Default directory hash: half_md4 Directory Hash Seed: 475ee556-9a7f-4c7b-93c3-21249906efea Journal backup: inode blocks Journal features: journal_incompat_revoke Journal size: 128M Journal length: 32768 Journal sequence: 0x0dc8 Journal start:18 cloud cloud-pc:$ cat /etc/fstab # /etc/fstab: static file system information. # # / was on /dev/vda1 during installation UUID=bbcbbb0e-a335-46fe-b829-b4bf7bef513b / ext4errors=remount-ro 0 1 # swap was on /dev/vda5 during installation UUID=e2e3ec5c-dc4c-4f5d-a176-0f166b419785 none swap sw 0 0
