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/*
* Reads the i-node structures from a raw disk device and
* then sums up the disk usage for each user. Prints out
* the number of blocks each user is using.
*
* If you are on a Sun workstation or other system using Sun's
* Network File System (NFS), be sure to define the constant
* NFS so that the proper files get included.
*/
#ifdef sun
#define NFS 1
#endif
#ifdef NFS
#include <sys/param.h>
#include <sys/time.h>
#include <sys/vnode.h>
#include <ufs/inode.h>
#include <sys/file.h>
#include <ufs/fs.h>
#include <stdio.h>
#include <pwd.h>
#else
#include <sys/param.h>
#include <sys/inode.h>
#include <sys/file.h>
#include <sys/fs.h>
#include <stdio.h>
#include <pwd.h>
#endif
/*
* Maximum user id.
*/
#ifndef MAXUID
#define MAXUID 32768
#endif
#define sblock sb_un.u_sblock
/*
* The super block. We allow enough room for
* a complete disk block.
*/
union {
struct fs u_sblock;
char dummy[SBSIZE];
} sb_un;
int nfiles; /* number of files in file system */
char *pname; /* program name (argv[0]) */
char *device; /* name of the disk device given */
char *filsys; /* name of the file system on device */
size_t blocks[MAXUID]; /* count of blocks used */
struct dinode *dinode; /* will hold all the i-node structures */
main(argc, argv)
int argc;
char **argv;
{
int i, fd;
register ino_t ino;
register struct dinode *di;
/*
* Save the program name and check our arguments.
*/
pname = *argv;
if (argc != 2) {
fprintf(stderr, "Usage: %s raw-disk-device\n", pname);
exit(1);
}
/*
* Open the device for reading.
*/
device = *++argv;
if ((fd = open(device, O_RDONLY)) < 0) {
perror(device);
exit(1);
}
/*
* Get the super-block from the device.
*/
getsblock(fd);
/*
* Get the i-node structures from the device.
*/
getinodes(fd);
close(fd);
/*
* Zero the block counts.
*/
for (i = 0; i < MAXUID; i++)
blocks[i] = 0;
/*
* Add up the number of blocks being used by
* each user id.
*/
for (ino = 0; ino < nfiles; ino++) {
/*
* ROOTINO is the first i-node; skip any
* before it.
*/
if (ino < ROOTINO)
continue;
di = &dinode[ino];
/*
* If this is zero, the i-node is free (not
* in use).
*/
if ((di->di_mode & IFMT) == 0)
continue;
/*
* Count the number of blocks being used by
* this file.
*/
blocks[di->di_uid] += di->di_blocks;
}
/*
* Print out what we added up.
*/
printusage();
exit(0);
}
/*
* getsblock--get the super-block from the device
* referred to by fd.
*/
getsblock(fd)
int fd;
{
/*
* Make sure the disk information is current.
* This causes all disk writes to be scheduled.
*/
sync();
/*
* Read in the super-block. It is stored at file
* system block number SBLOCK.
*/
bread(fd, SBLOCK, &sblock, SBSIZE);
/*
* The number of files (i-nodes) is calculated by
* multiplying the number of i-nodes per cylinder
* group by the number of cylinder groups.
*/
nfiles = sblock.fs_ipg * sblock.fs_ncg;
/*
* Save the name of the file system.
*/
filsys = sblock.fs_fsmnt;
}
/*
* getinodes--read in the i-node structures from the device
* referred to by fd.
*/
getinodes(fd)
int fd;
{
register ino_t ino;
register daddr_t iblk;
struct dinode *malloc();
/*
* Allocate space for them all.
*/
dinode = malloc(nfiles * sizeof(struct dinode));
if (dinode == NULL) {
fprintf(stderr, "%s: out of memory.\n", pname);
exit(1);
}
/*
* We read in i-nodes a disk block-full at a time.
* The INOPB macro returns the number of i-nodes
* in a block; it uses the super-block to determine
* the file system block size.
*/
for (ino = 0; ino < nfiles; ino += INOPB(&sblock)) {
/*
* The i-node file system block number is given by
* the itod macro. The disk block number is computed
* from the file system block number by the fsbtodb macro.
*/
iblk = fsbtodb(&sblock, itod(&sblock, ino));
/*
* Read in this block of i-nodes.
*/
bread(fd, iblk, &dinode[ino], sblock.fs_bsize);
}
}
/*
* bread-read cnt bytes form fd into buf, starting at
* address bno.
*/
bread(fd, bno, buf, cnt)
daddr_t bno;
char *buf;
int cnt;
{
int n;
/*
* Seek to the proper block. The dtob macro converts
* the block number to a byte address.
*/
lseek(fd, (long) dtob(bno), L_SET);
/*
* Round cnt up to a multiple of the device block size.
*/
cnt = roundup(cnt, DEV_BSIZE);
/*
* Read in the data.
*/
if ((n = read(fd, buf, cnt)) != cnt) {
perror(filsys);
exit(1);
}
}
/*
* printusage-print out the disk usage in blocks.
*/
printusage()
{
register int i;
struct passwd *pwd;
printf("%s (%s):\n", device, filsys);
printf(" Blocks \\t User\n");
for (i=0; i < MAXUID; i++) {
if (blocks[i] == 0)
continue;
/*
* Look up the login name, and use it if we find it.
*/
if ((pwd = getpwuid(i)) != NULL)
printf("%8d\\t%s\n", blocks[i], pwd->pw_name);
else
printf("%8d\\t#%d\n", blocks[i], i);
}
}
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