Can somebody explain this? du & ls showing different sizes

[Vijay Gill]

2009/2/15 Vijay Gill <vijay.s.gill at gmail.com>:
> 2009/2/15 Rick <ellis at spinics.net>:
>> In article <60fdb1ad0902151205v6ef67c07v128f0c88f5895240 at mail.gmail.com>,
>> Vijay Gill  <fedora-list at redhat.com> wrote:
>>
>>>Running du -h tells that the file occupies 512M but ls -l tells that
>>>the file is a lot smaller.
>>
>> Apples and oranges. You get the file *size* with ls and the disk usage
>> with du. They aren't the same thing.
>>
>> --
>> http://yosemitenews.info/
>>

I found another funny behavior. Notice the sizes of
/var/log/samba/log.winbindd-idmap before and after I run xfs_io -c
stats on it. Again just looking at stats must not change the space
allocated to the file.


[root at aria tmp]# du -sh /var/log/samba/*
0       /var/log/samba/asus.log
0       /var/log/samba/cores
12K     /var/log/samba/__ffff_10.1.0.151.log
52K     /var/log/samba/log.nmbd
4.0K    /var/log/samba/log.smbd
0       /var/log/samba/log.wb-ARIA
0       /var/log/samba/log.wb-BUILTIN
4.0K    /var/log/samba/log.winbindd
0       /var/log/samba/log.winbindd-dc-connect
512M    /var/log/samba/log.winbindd-idmap
56K     /var/log/samba/log.winbindd-idmap.old
512M    /var/log/samba/nmbd.log
4.0K    /var/log/samba/smbd.log
4.0K    /var/log/samba/winbindd.log

[root at aria tmp]# xfs_io -c stat /var/log/samba/log.winbindd-idmap
fd.path = "/var/log/samba/log.winbindd-idmap"
fd.flags = non-sync,non-direct,read-write
stat.ino = 3944597
stat.type = regular file
stat.size = 403
stat.blocks = 1048576
fsxattr.xflags = 0x0 [--------------]
fsxattr.projid = 0
fsxattr.extsize = 0
fsxattr.nextents = 2
fsxattr.naextents = 0
dioattr.mem = 0x200
dioattr.miniosz = 512
dioattr.maxiosz = 2147483136

[root at aria tmp]# du -sh /var/log/samba/*
0       /var/log/samba/asus.log
0       /var/log/samba/cores
12K     /var/log/samba/__ffff_10.1.0.151.log
52K     /var/log/samba/log.nmbd
4.0K    /var/log/samba/log.smbd
0       /var/log/samba/log.wb-ARIA
0       /var/log/samba/log.wb-BUILTIN
4.0K    /var/log/samba/log.winbindd
0       /var/log/samba/log.winbindd-dc-connect
4.0K    /var/log/samba/log.winbindd-idmap
56K     /var/log/samba/log.winbindd-idmap.old
512M    /var/log/samba/nmbd.log
4.0K    /var/log/samba/smbd.log
4.0K    /var/log/samba/winbindd.log
[root at aria tmp]#