How to know what filesystem is on my ubuntu and whether dir_index is enabled?

[NoOp]

On 01/25/2010 06:19 PM, Peng Yu wrote:
> On Mon, Jan 25, 2010 at 7:48 PM, NoOp <glgxg at sbcglobal.net> wrote:
>> On 01/25/2010 03:28 PM, Peng Yu wrote:
>>> Could somebody let me know how to figure out what filesystem is on my
>>> ubuntu machine? And how to check whether dir_index is enabled?
>>>
>>
>> $ cat /etc/fstab
>>
>> will generally provide you with the filesystem information. Example:
>>
>> $ cat /etc/fstab
>> # /etc/fstab: static file system information.
>> #
>> #  -- This file has been automaticly generated by ntfs-config --
>> #
>> # <file system> <mount point>   <type>  <options>       <dump>  <pass>
>>
>> proc /proc proc defaults 0 0
>> # Entry for /dev/sdb1 :
>> UUID=c<snipped> / ext4 defaults,errors=remount-ro 0 1
>>
>> From the above you can see that the filesystem is ext4.
>>
>> Another cli method is to use parted:
>>
>> $ sudo parted -l
>>
>> For a GUI, use gparted.
> 
> There are xfs and ext3 filesystems on my machine. How to check if
> dir_index is enabled?
> 

$ sudo tune2fs -l /dev/sdb1
tune2fs 1.41.9 (22-Aug-2009)
Filesystem volume name:   <none>
Last mounted on:          /
Filesystem UUID:          <snipped>
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:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              12263424
Block count:              49034388
Reserved block count:     2451719
Free blocks:              36399827
Free inodes:              11727854
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      1012
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
Flex block group size:    16
Filesystem created:       Wed Dec  2 10:35:00 2009
Last mount time:          Mon Jan 25 08:55:09 2010
Last write time:          Thu Jan 21 19:31:13 2010
Mount count:              23
Maximum mount count:      30
Last checked:             Sun Jan 10 12:11:36 2010
Check interval:           15552000 (6 months)
Next check after:         Fri Jul  9 13:11:36 2010
Lifetime writes:          110 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
First orphan inode:       263988
Default directory hash:   half_md4
Directory Hash Seed:      629cbef2-8760-4e3b-95d8-04c488ee1156
Journal backup:           inode blocks

It's under the Filesystem features:
Filesystem features:      has_journal ext_attr resize_inode dir_inde