On 2012-07-29, at 12:08, Arne Hüggenberg <hueggenberg@xxxxxxxxxxxxxxxxx> wrote: > On Jul 29, 2012, at 8:30 PM, Andreas Dilger wrote: >>>> Unfortunately, the group descriptor size is not printed. >>> >>> how can i get the group descriptor size? >> >> Possibly with "debugfs stats"? > > ~ # debugfs /dev/vg0/lvol1 > debugfs 1.42.4 (12-June-2012) > debugfs: stats > debugfs: stats > > Filesystem volume name: <none> > Last mounted on: /home/filestore_extern_1 > Filesystem UUID: 8fba4f1b-5311-4c9b-b8bf-def4957dc1bd > Filesystem magic number: 0xEF53 > Filesystem revision #: 1 (dynamic) > Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent 64bit 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: 521011200 > Block count: 4168089600 > Reserved block count: 191127425 > Free blocks: 2162482117 > Free inodes: 520936736 > First block: 0 > Block size: 4096 > Fragment size: 4096 > Reserved GDT blocks: 60 > Blocks per group: 32768 > Fragments per group: 32768 > Inodes per group: 4096 > Inode blocks per group: 256 > RAID stride: 16 > RAID stripe width: 160 > Flex block group size: 16 > Filesystem created: Fri Jul 27 17:16:24 2012 > Last mount time: Sun Jul 29 15:22:23 2012 > Last write time: Sun Jul 29 20:50:44 2012 > Mount count: 6 > Maximum mount count: -1 > Last checked: Fri Jul 27 17:16:24 2012 > Check interval: 0 (<none>) > Lifetime writes: 7662 GB > 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: ef2ec72a-750b-4822-bd8d-9117faadeaee > Journal backup: inode blocks > Directories: 6392 > Group 0: block bitmap at 2049, inode bitmap at 2065, inode table at 2081 > 26585 free blocks, 4085 free inodes, 2 used directories, 4084 unused inodes > [Checksum 0x7d46] > Group 1: block bitmap at 2050, inode bitmap at 2066, inode table at 2337 > 4634 free blocks, 4096 free inodes, 0 used directories, 4096 unused inodes > [Inode not init, Checksum 0x97aa] > Group 2: block bitmap at 2051, inode bitmap at 2067, inode table at 2593 > 1020 free blocks, 4096 free inodes, 0 used directories, 4096 unused inodes > [Inode not init, Checksum 0x571f] > Group 3: block bitmap at 2052, inode bitmap at 2068, inode table at 2849 > 2047 free blocks, 4096 free inodes, 0 used directories, 4096 unused inodes Surprisingly, the group descriptor size is also not printed here. Looking at the code in mke2fs, it appears the 64-byte size used for filesystems when the 64bit flag is set, regardless of what size the filesystem is, and there is no way to change it. It looks like my theory is wrong, but I don't have access to a system to test this. Probably worthwhile to ask Yongqiang Yang (CC'd), who wrote the 64-bit resize code. Cheers, Andreas-- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
