Re: infinite loop in jffs2_flush_wbuf_gc()?

["Artem B. Bityuckiy" <dedekind@yandex.ru>]

Oh, there was something nasty with indentation, here it is again.

/*
  * JFFS2 file expansion test.
  */

#include <sys/vfs.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>

#define JFFS2_SUPER_MAGIC 0x72b6

#define FNAME "tmp"

void print_jffs_stat(char *path, struct statfs *fsinfo){
     if (statfs(path, fsinfo) == -1){
	perror("statfs() failed"); exit(1);
     }
     if (fsinfo->f_type != JFFS2_SUPER_MAGIC){
	fprintf(stderr, "%s is not jffs2 file system\n", path); exit(1);
     }
     printf("--- JFFS2 stat ---\n");
     printf("f_bsize   = %d\n", fsinfo->f_bsize);
     printf("f_blocks  = %d\n", fsinfo->f_blocks);
     printf("f_bfree   = %d\n", fsinfo->f_bfree);
     printf("f_bavail  = %d\n", fsinfo->f_bavail);
     printf("f_files   = %d\n", fsinfo->f_files);
     printf("f_ffree   = %d\n", fsinfo->f_ffree);
     printf("f_fsid    = %d\n", fsinfo->f_fsid);
     printf("f_namelen = %d\n", fsinfo->f_namelen);
}

int main(int argc, char *argv[]){
     if (argc < 1){
	fprintf(stderr, "%s jffs_root\n", argv[0]); return 1;
     }
     if (chdir(argv[1]) == -1){
	perror("chdir to jffs2 root failed"); return 1;
     }

     struct statfs fsinfo;
     struct stat   fdinfo;

     /* get initial jffs2 stat */
     print_jffs_stat(argv[1], &fsinfo);

     int		i, fd, cnt;
     off_t	pos;
     char	buf[fsinfo.f_bsize];

     printf("\ncreate file filled by zero with size more then flash\n");
     printf("it should fit flash since it maybe compressed perfectly\n");
     bzero(buf, fsinfo.f_bsize);

     if ((fd = open(FNAME, O_WRONLY | O_CREAT, 0664)) == -1){
	perror("can't open temporary file"); return 1;
     }
     unlink(FNAME);

     for(i = 0; i < fsinfo.f_blocks ; i++){
	cnt = write(fd, buf, fsinfo.f_bsize);
	if (cnt != fsinfo.f_bsize){
	    fprintf(stderr, "write to tmp file failed\n"); return 1;
	}
     }

     printf("\nfill the file with random data. Now in should not fit on 
flash\n");
     printf("so the error 'No space left on device' should appear\n");
     srand(1); for(i = 0; i < fsinfo.f_bsize; i++) buf[i] = rand();

     pos = lseek(fd, 0, SEEK_SET);
     if (pos == (off_t)-1){
	perror("lseek failed"); return 1;
     }

     for(i = 0; i < fsinfo.f_blocks ; i++){
	cnt = write(fd, buf, fsinfo.f_bsize);
	if (cnt != fsinfo.f_bsize) break;
     }
     if ((cnt != -1)||(errno != ENOSPC)){
	perror("Warning!!! Expected ENOSPC:"); return 1;
     }
     fsync(fd);
     printf("Ok. ENOSPC occured. Thats fine!\n");

     close(fd);
}


-- 
Best Regards,
Artem B. Bityuckiy,
St.-Petersburg, Russia.