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so there is no way to know the size occupied by data ?

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Top Forums UNIX for Advanced & Expert Users so there is no way to know the size occupied by data ?
# 1  
Old 11-08-2007
so there is no way to know the size occupied by data ?
I want to find out how many disk blocks are used by only data (and not metadata) by a file.

But as far as I can tell, if the file has holes, then there is no way to know this.

You can find out the logical size of the file (physical size + hole blocks).
You can get the physical size of the file (data + metadata).
But no matter what calculation you do or whatever program you write, you cannot get the blocks occupied by data.
# 2  
Old 11-08-2007
What metadata are you worried about?

Are you on an XFS system?

What is the actual requirement here?

Quote:
Originally Posted by the_learner
But no matter what calculation you do or whatever program you write, you cannot get the blocks occupied by data.
That cannot be true because a disk file system driver is a program which does calculations.
# 3  
Old 11-08-2007
hmm, I am sorry, by metadata I think I meant Indirect blocks

what I mean is, whatever shell cmds I have to get a file size.. they will give me the total disk space occuiped by the file (data + other stuff). But I want to know whats the space occupied by data only.

ls -ls for example...

Quote:
$ ls -ls temp
104 -rwxr--r-- 1 vqw engr 101300 Nov 7 16:25 temp
Here 104 is the total physical disk space occupied by the file. As far as I understand this includes space occupied by data, metadata, Indirect blocks, (Inode) etc etc...

Sure, a file system level program might be able to give the answer.. but how can a user level program find out the number of data blocks ?

(A program might read the file and calculate the number of blocks read, but if the file has holes.. it will read those too.. )
# 4  
Old 11-08-2007
locate holes in a sparse file.

The most portable solution is "dd" the file into another file and compare the difference, dd will happily write out the full size.
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