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Full Discussion: free disk space calc
Top Forums Programming free disk space calc Post 302095797 by ninjanesto on Friday 10th of November 2006 05:19:32 AM
Old 11-10-2006
free disk space calc

I everybody!!
How can i use statvfs() to calculate disk usage and free disk space??

Im using this code:

/* Any file on the filesystem in question */
char *filename = "/home/nesto/test/test.cpp";

struct statvfs buf;
if (!statvfs(filename, &buf)) {

unsigned long blksize, blocks, freeblks, disk_size, used, free;
blksize = buf.f_bsize;
blocks = buf.f_blocks;
freeblks = buf.f_bfree;
disk_size = blocks * blksize;
free = freeblks * blksize;
used = disk_size - free; printf("Disk usage : %lu \t Free space %lu\n", used, free);

} else {

printf("Couldn't get file system statistics\n");
}
return 0;

But when i execute "df ." the values dont match
Can anyone help me.

Best regards to all
 

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vdf(8)							      System Manager's Manual							    vdf(8)

NAME
vdf - Display disk information for AdvFS domains and filesets SYNOPSIS
/sbin/advfs/vdf [-k] [-l] domain | domain#fileset OPTIONS
Display disk blocks as 1024-byte blocks instead of the default of 512-byte blocks. When the -l option is specified, the default informa- tion for both the domain and filesets is reformatted to show the relationships between them. For example, any domain metadata displayed is the total metadata shared by filesets in the domain. OPERANDS
The full path name of an AdvFS file domain. When a domain argument is specified, the default display contains information about the number of disk blocks allocated to the domain, the number of disk blocks in use by the domain, and the number of disk blocks that are available to the domain. The name of an AdvFS fileset in an AdvFS file domain. When a domain#fileset argument is specified, the default display contains information about the number of disk blocks allocated to the fileset, the number of disk blocks in use by the fileset, and the number of disk blocks that are available to the fileset. This information is in the same format as that displayed by the df command. DESCRIPTION
The vdf utility is a script that reformats output from the showfdmn, showfsets, shfragbf, and df utilities in order to display information about the disk usage of AdvFS file domains and filesets. In addition, the utility computes and displays the sizes of metadata files in a domain or fileset. NOTES
The disk space used by clone filesets is not calculated. If clone filesets are present in the specified domain, the utility displays the following warning message: Clone fileset(s) in this domain; totals may not be accurate RESTRICTIONS
You must be the root user to use this command. The command cannot be used on filesets that are NFS mounted. All filesets in a domain must be mounted in order to calculate the disk usage of the domain. EXIT STATUS
The utility returns a value of 0 (zero) on successful completion. It returns a value of 1 on failure. EXAMPLES
The following example shows the summary information for a fileset named testfs in a domain named test. The output is the same as for the df command: # vdf test#testfs Filesystem 512-blocks Used Available Capacity Mounted on test#testfs 60000 20800 39200 35% /mnt The following example shows the summary information for a domain named usr_domain where the number of blocks used for meta- data and data equal 89% of the domain's capacity: # vdf usr_domain Domain 512-blocks Metadata Used Available Capacity usr_domain 65536 11219 47549 6768 89% The following example shows a detailed display of the domain that contains the fileset test#testfs. There are two filesets in the domain; each has a quota limit of 60,000 blocks: # vdf -l test#testfs Domain 512-blocks Metadata Used Available Capacity test 266240 5824 29128 231288 13% Fileset QuotaLimit Used Available Capacity testfs 60000 20800 39200 35% testfs2 60000 8328 51672 14% The following example shows a detailed display of a fileset that is the only fileset in the domain and that the fileset has a quota limit that is greater than the domain can hold: # vdf -l test#testfs Domain 512-blocks Metadata Used Avail- able Capacity test 266240 5824 29128 231288 13% Fileset QuotaLimit Used Available Capacity testfs 300000 20800 231288 8% FILES
SEE ALSO
Commands: df(1), showfdmn(8), showfsets(8), shfragbf(8) Files: advfs(4) vdf(8)
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