Linux disk and file system management (4) _ viewing and modifying file system attributes
File System attribute viewing and adjustment tool: e2label command: sets the file system volume Label to avoid formatting and modifying the e2label device name [Label]
# View the partition volume label [root @ localhost ~] # E2label/dev/sdb1mytest # modify the partition volume label [root @ localhost ~] # E2label/dev/sdb1 'labelnew' [root @ localhost ~] # E2label/dev/sdb1labelNew
Tune2fs command: display the attributes of the ext file system or modify its attribute Syntax: tune2fs [option] device name parameter:-l: display information in the super block-j: convert the ext2 File System to the ext3 file system and add the journal-L 'label': Like e2label, partition volume label-m #: Adjust the percentage of management space reserved for the Administrator-O: enable or disable file system attributes [^] feature [,...] -o: enable or disable the default mount option of the file system [^] mount-option [,...] man tune2fs:
[Root @ localhost ~] # Tune2fs-l/dev/sdb1tune2fs 1.42.9 (28-Dec-2013) Filesystem volume name: labelNew -------> volume label Last mounted on:/mnt/test3 -----> mount point Filesystem UUID: e238f3ae-863c-473e-a1ca-35b1e0a69de2Filesystem magic number: 0xEF53Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent 64bit flex_bg sparse_super large_file huge_file uninit_bg Dir_nlink expose flags: signed_directory_hash Default mount options: user_xattr acl ----> Default mount Option Filesystem state: cleanErrors behavior: ContinueFilesystem OS type: LinuxInode count: 65536 Block count: 262144 Reserved block count: 13107 Free blocks: 249189 Free inodes: 65524 First block: 0 Block size: 4096 Fragment size: 4096 Group descriptor size: 64 Reserved GDT blocks: 127 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 8192 Inode blocks per group: 512 Flex block group size: 16 Filesystem created: Tue Sep 15 05:53:15 2015 Last mount time: tue Sep 15 17:07:02 2015 Last write time: Tue Sep 15 17:59:21 2015 Mount count: 9 Maximum mount count:-1 Last checked: Tue Sep 15 05:53:15 2015 Check interval: 0 (<none>) Lifetime writes: 49 MBReserved blocks uid: 0 (user root) Reserved B Locks 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_md4Directory Hash Seed: 45da449e-ad33-4a49-9660-1469a94cc2f8Journal backup: inode blocks # modify the default Mount Option: Enable journal_data [root @ localhost ~] # Tune2fs-o journal_data/dev/sdb1tune2fs 1.42.9 (28-Dec-2013) [root @ localhost ~] # Tune2fs-l/dev/sdb1.... Default mount options: journal_data user_xattr acl ....
Dumpe2fs command: Display ext2/ext3/ext4 File System Information Syntax: dumpe2fs [option] DEVICE parameter:-h: show only super block information;-B: show bad block information-x: example of displaying detailed group information:
[Root @ localhost ~] # Dumpe2fs-x/dev/sdb1dumpe2fs 1.42.9 (28-Dec-2013) Filesystem volume name: labelNew... super block information... journal start: 0 Group 0: (Blocks 0x00000000-0x00007fff) [ITABLE_ZEROED] Checksum 0xba41, unused inodes 8180 Primary superblock at 0x00000000, group descriptors at 0x00000001-0x00000001 Reserved GDT blocks at 0x00000002-0x00000080 Block bitmap at 0x00000081 (+ 129), Inode bitmap at 0x00000091 (+ 145) Inode table at least (+ 161) 28521 free blocks, 8180 free inodes, 2 directories, 8180 unused inodes Free blocks: 0x0000008e-0x00000090, 0x00000099-0x000000a0, Invalid Free inodes: 0x0000000d-0x00002000... group information...