by Jonathan Simms on Wed Dec 10, 2008 7:35 pm
Kayla,
It appears that you need write permissions to view superblock information on a device.
Here's an example:
[code]$ stat /dev/sda1
File: `/dev/sda1'
Size: 0 Blocks: 0 IO Block: 4096 block special file
Device: fh/15d Inode: 1196 Links: 1 Device type: 8,1
Access: (0640/brw-r-----) Uid: ( 0/ root) Gid: ( 6/ disk)
Access: 2008-12-10 18:25:18.220465702 -0800
Modify: 2008-12-10 10:36:36.067607980 -0800
Change: 2008-12-10 10:36:38.292140423 -0800 [/code]
Notice the access time is 18:25:18
[code] # sudo /sbin/dumpe2fs /dev/sda1 | grep UUID
dumpe2fs 1.40.8 (13-Mar-2008)
Filesystem UUID: 283294d4-365f-407f-bef8-1de88283f24f[/code]
[code]
$ stat /dev/sda1
File: `/dev/sda1'
Size: 0 Blocks: 0 IO Block: 4096 block special file
Device: fh/15d Inode: 1196 Links: 1 Device type: 8,1
Access: (0640/brw-r-----) Uid: ( 0/ root) Gid: ( 6/ disk)
Access: 2008-12-10 18:29:52.360122560 -0800
Modify: 2008-12-10 10:36:36.067607980 -0800
Change: 2008-12-10 10:36:38.292140423 -0800[/code]
Now the access times have changed to 18:29:52
I do a stat /dev/sda1 once more without running dumpe2fs:
[code]
$ stat /dev/sda1
File: `/dev/sda1'
Size: 0 Blocks: 0 IO Block: 4096 block special file
Device: fh/15d Inode: 1196 Links: 1 Device type: 8,1
Access: (0640/brw-r-----) Uid: ( 0/ root) Gid: ( 6/ disk)
Access: 2008-12-10 18:29:52.360122560 -0800
Modify: 2008-12-10 10:36:36.067607980 -0800
Change: 2008-12-10 10:36:38.292140423 -0800[/code]
The access time has not changed.