From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from [195.209.228.254] (helo=shelob.oktetlabs.ru)
	by canuck.infradead.org with esmtps (Exim 4.52 #1 (Red Hat Linux))
	id 1Dt7ML-00014y-4N
	for linux-mtd@lists.infradead.org; Thu, 14 Jul 2005 13:19:00 -0400
Message-ID: <42D69E59.7000901@yandex.ru>
Date: Thu, 14 Jul 2005 21:18:17 +0400
From: "Artem B. Bityuckiy" <dedekind@yandex.ru>
MIME-Version: 1.0
To: rick@efn.org
References: <E1DqvgV-000275-00@amazonia.client.comcast.net>	<1121093753.27264.117.camel@hades.cambridge.redhat.com>	<E1Ds2ma-0005ta-00@amazonia.client.comcast.net>	<1121108481.27264.129.camel@hades.cambridge.redhat.com>	<E1Ds4AF-00063d-00@amazonia.client.comcast.net>	<1121115438.3430.6.camel@localhost.localdomain>	<E1DsMIp-0004U9-00@amazonia.client.comcast.net>	<1121181101.12169.4.camel@hades.cambridge.redhat.com>	<E1DsNHk-0004bq-00@amazonia.client.comcast.net>	<1121186381.12086.6.camel@localhost.localdomain>	<E1DsOD0-0004iT-00@amazonia.client.comcast.net>	<1121189272.12224.10.camel@localhost.localdomain>	<E1Dspqm-0003zl-00@amazonia.client.comcast.net>	<1121294622.12224.87.camel@localhost.localdomain>
	<E1Dt4R6-0005UI-00@amazonia.client.comcast.net>
In-Reply-To: <E1Dt4R6-0005UI-00@amazonia.client.comcast.net>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
Cc: linux-mtd@lists.infradead.org
Subject: Re: infinite loop in jffs2_flush_wbuf_gc()?
List-Id: Linux MTD discussion mailing list <linux-mtd.lists.infradead.org>
List-Unsubscribe: <http://lists.infradead.org/mailman/listinfo/linux-mtd>,
	<mailto:linux-mtd-request@lists.infradead.org?subject=unsubscribe>
List-Archive: <http://lists.infradead.org/pipermail/linux-mtd>
List-Post: <mailto:linux-mtd@lists.infradead.org>
List-Help: <mailto:linux-mtd-request@lists.infradead.org?subject=help>
List-Subscribe: <http://lists.infradead.org/mailman/listinfo/linux-mtd>,
	<mailto:linux-mtd-request@lists.infradead.org?subject=subscribe>

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.