58 lines
1.1 KiB
C
58 lines
1.1 KiB
C
/* frag.c - simple fragmentation checker */
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/* A non-destructive program to print out the allocation blocks in use
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for a file */
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#define FIBMAP 1
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int main(int argc,char **argv)
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{
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int fd,last,frags,blocks,block;
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struct stat st;
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if (argc < 2) {
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fprintf(stderr,"usage: %s filename ...\n",argv[0]);
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exit(1);
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}
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while (--argc) {
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if ((fd = open(argv[1],O_RDONLY)) < 0) {
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perror(argv[1]);
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exit(1);
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}
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if (fstat(fd,&st) < 0) {
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perror(argv[1]);
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exit(1);
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}
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if (!S_ISREG(st.st_mode)) {
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argv++;
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(void) close(fd);
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continue;
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}
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last = -1;
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frags = 0;
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for (blocks = 0; blocks < ((st.st_size+1023) >> 10); blocks++) {
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block = blocks;
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if (ioctl(fd,FIBMAP,&block) < 0) {
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perror(argv[1]);
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exit(1);
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}
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if (block) {
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if (last != block-1 && last != block+1) frags++;
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last = block;
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}
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}
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printf(" %3d%% %s (%d fragment%s, %d block%s)\n",frags < 2 ? 0 :
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frags*100/blocks,*++argv,frags,frags == 1 ? "" : "s",blocks,blocks ==
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1 ? "" : "s");
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(void) close(fd);
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}
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exit(0);
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}
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