tests: move checkfs test to tests directory

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

6 files changed, 1220 insertions, 0 deletions

diff --git a/tests/checkfs/Makefile b/tests/checkfs/Makefile
new file mode 100644
index 0000000..ac94dde
--- /dev/null
+++ b/tests/checkfs/Makefile
@@ -0,0 +1,14 @@
+
+all: checkfs makefiles
+
+checkfs: checkfs.c Makefile common.h comm.o
+	gcc -g -Wall checkfs.c comm.o -o checkfs
+
+comm.o: comm.c Makefile
+	gcc -g -Wall -c comm.c -o comm.o
+
+makefiles: makefiles.c Makefile common.h
+	gcc -g -Wall makefiles.c -o makefiles
+
+clean:
+	rm -f makefiles checkfs *~ *.o
diff --git a/tests/checkfs/README b/tests/checkfs/README
new file mode 100644
index 0000000..d9966a5
--- /dev/null
+++ b/tests/checkfs/README
@@ -0,0 +1,173 @@
+$Id: README,v 1.2 2001/06/21 23:07:06 dwmw2 Exp $
+$Log: README,v $
+Revision 1.2  2001/06/21 23:07:06  dwmw2
+Initial import to MTD CVS
+
+Revision 1.1  2001/06/11 19:34:40  vipin
+Added README file to dir.
+
+
+This is the README file for the "checkfs" power fail test program.
+By: Vipin Malik
+
+NOTE: This program requires an external "power cycling box"
+connected to one of the com ports of the system under test. 
+This power cycling box should wait for a random amount of time 
+after it receives a "ok to power me down" message over the 
+serial port, and then yank power to the system under test.
+(The box that I rigged up tested with waits anywhere from 
+0 to ~40 seconds).
+
+
+It should then restore power after a few seconds and wait for the
+message again.
+
+
+ABOUT:
+
+This program's primary purpose it to test the reliiability
+of various file systems under Linux.
+
+SETUP:
+
+You need to setup the file system you want to test and run the
+"makefiles" program ONCE. This creates a set of files that are
+required by the "checkfs" program.
+
+Also copy the "checkfs" executable program to the same dir.
+
+Then you need to make sure that the program "checkfs" is called
+automatically on startup. You can customise the operation of
+the "checkfs" program by passing it various cmd line arguments.
+run "checkfs -?" for more details.
+
+****NOTE*******
+Make sure that you call the checkfs program only after you have
+mounted the file system you want to test (this is obvious), but
+also after you have run any "scan" utilities to check for and
+fix any file systems errors. The e2fsck is one utility for the
+ext2 file system. For an automated setup you of course need to
+provide these scan programs to run in standalone mode (-f -y
+flags for e2fsck for example).
+
+File systems like JFFS and JFFS2 do not have any such external
+utilities and you may call "checkfs" right after you have mounted
+the respective file system under test.
+
+There are two ways you can mount the file system under test:
+
+1. Mount your root fs on a "standard" fs like ext2 and then
+mount the file system under test (which may be ext2 on another
+partition or device) and then run "checkfs" on this mounted
+partition OR
+
+2. Make your fs AND device that you have put this fs as your
+root fs and run "checkfs" on the root device (i.e. "/").
+You can of course still run checkfs under a separate dir
+under your "/" root dir.
+
+I have found the second method to be a particularly stringent
+arrangement (and thus preferred when you are trying to break
+something).
+
+Using this arrangement I was able to find that JFFS clobbered
+some "sister" files on the root fs even though "checkfs" would
+run fine through all its own check files.
+
+(I found this out when one of the clobbered sister file happened
+to be /bin/bash. The system refused to run rc.local thus 
+preventing my "checkfs" program from being launched :)
+
+"checkfs":
+
+The "formatting" reliability of the fs as well as the file data integrity
+of files on the fs can be checked using this program.
+
+"formatiing" reliability can only be checked via an indirect method.
+If there is severe formatting reliability issues with the file system,
+it will most likely cause other system failures that will prevent this
+program from running successfully on a power up. This will prevent
+a "ok to power me down" message from going out to the power cycling
+black box and prevent power being turned off again.
+
+File data reliability is checked more directly. A fixed number of
+files are created in the current dir (using the program "makefiles").
+
+Each file has a random number of bytes in it (set by using the
+-s cmd line flag). The number of "ints" in the file is stored as the
+first "int" in it (note: 0 length files are not allowed). Each file
+is then filled with random data and a 16 bit CRC appended at the end.
+
+When "checkfs" is run, it runs through all files (with predetermined 
+file names)- one at a time- and checks for the number of "int's" 
+in it as well as the ending CRC.
+
+The program exits if the numbers of files that are corrupt are greater
+that a user specified parameter (set by using the -e cmd line flag).
+
+If the number of corrupt files is less than this parameter, the corrupt
+files are repaired and operation resumes as explained below.
+
+The idea behind allowing a user specified amount of corrupt files is as
+follows:
+
+If you are testing for "formatting" reliability of a fs, and for
+the data reliability of "other" files present of the fs, use -e 1.
+"other" files are defined as sister files on the fs, not being written to
+by the "checkfs" test program.
+
+As mentioned, in this case you would set -e 1, or allow at most 1 file 
+to be corrupt each time after a power fail. This would be the file 
+that was probably being written to when power failed (and CRC was not 
+updated to reflect the  new data being written). You would check file 
+systems like ext2 etc. with such a configuration.
+(As you have no hope that these file systems provide for either your
+new data or old data to be present in the file if power failed during
+the write. This is called "roll back and recover".)
+
+With JFFS2 I tested for such "roll back and recover" file data reliability
+by setting -e 0 and making sure that all writes to the file being
+updated are done in a *single* write().
+
+This is how I found that JFFS2 (yet) does NOT support this functionality.
+(There was a great debate if this was a bug or a feature that was lacking
+or even an issue at all. See the mtd archives for more details).
+
+In other words, JFFS2 will partially update a file on FLASH even before
+the write() command has completed, thus leaving part old data part new
+data in your file if power failed in the middle of a write().
+
+This is bad functionality if you are updating a binary structure or a 
+CRC protected file (as in our case).
+
+
+If All Files Check Out OK:
+
+On the startup scan, if there are less errors than specified by the "-e flag" 
+a "ok to power me down message" is sent via the specified com port.
+
+The actual format of this message will depend on the format expected
+by the power cycling box that will receive this message. One may customise
+the actual message that goes out in the "do_pwr_dn)" routine in "comm.c".
+
+This file is called with an open file descriptor to the comm port that
+this message needs to go out over and the count of the current power
+cycle (in case your power cycling box can display/log this count).
+
+After this message has been sent out, the checkfs program goes into
+a while(1) loop of writing new data (with CRC), one at a time, into
+all the "check files" in the dir.
+
+Its life comes to a sudden end when power is asynchronously pulled from
+under its feet (by your external power cycling box).
+
+It comes back to life when power is restored and the system boots and
+checkfs is called from the rc.local script file.
+
+The cycle then repeats till a problem is detected, at which point
+the "ok to power me down" message is not sent and the cycle stops
+waiting for the user to examine the system.
+
+
+
+
diff --git a/tests/checkfs/checkfs.c b/tests/checkfs/checkfs.c
new file mode 100644
index 0000000..da2d0c4
--- /dev/null
+++ b/tests/checkfs/checkfs.c
@@ -0,0 +1,695 @@
+/*
+
+ * Copyright Daniel Industries.
+ *
+ * Created by: Vipin Malik (vipin.malik@daniel.com)
+ *
+ * This code is released under the GPL version 2. See the file COPYING
+ * for more details.
+ *
+ * Software distributed under the Licence is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing rights and
+ * limitations under the Licence.
+
+  This program opens files in progression (file00001, file00002 etc),
+  upto MAX_NUM_FILES and checks their CRC. If a file is not found or the
+  CRC does not match it stops it's operation.
+
+  Everything is logged in a logfile called './logfile'.
+
+  If everything is ok this program sends a signal, via com1, to the remote
+  power control box to power cycle this computer.
+
+  This program then proceeds to create new files file0....file<MAX_NUM_FILES>
+  in a endless loop and checksum each before closing them.
+
+  STRUCTURE OF THE FILES:
+  The fist int is the size of the file in bytes.
+  The last 2 bytes are the CRC for the entire file.
+  There is random data in between.
+
+  The files are opened in the current dir.
+
+  $Id: checkfs.c,v 1.8 2005/11/07 11:15:17 gleixner Exp $
+  $Log: checkfs.c,v $
+  Revision 1.8  2005/11/07 11:15:17  gleixner
+  [MTD / JFFS2] Clean up trailing white spaces
+
+  Revision 1.7  2001/06/21 23:04:17  dwmw2
+  Initial import to MTD CVS
+
+  Revision 1.6  2001/06/08 22:26:05  vipin
+  Split the modbus comm part of the program (that sends the ok to pwr me down
+  message) into another file "comm.c"
+
+  Revision 1.5  2001/06/08 21:29:56  vipin
+  fixed small issue with write() checking for < 0 instead of < (bytes to be written).
+  Now it does the latter (as it should).
+
+  Revision 1.4  2001/05/11 22:29:40  vipin
+  Added a test to check and err out if the first int in file (which tells us
+  how many bytes there are in the file) is zero. This will prevent a corrupt
+  file with zero's in it from passing the crc test.
+
+  Revision 1.3  2001/05/11 21:33:54  vipin
+  Changed to use write() rather than fwrite() when creating new file. Additionally,
+  and more important, it now does a single write() for the entire data. This will
+  enable us to use this program to test for power fail *data* reliability when
+  writing over an existing file, specially on powr fail "safe" file systems as
+  jffs/jffs2. Also added a new cmdline parameter "-e" that specifies the max # of
+  errors that can be tolerated. This should be set to ZERO to test for the above,
+  as old data should be reliabily maintained if the newer write never "took" before
+  power failed. If the write did succeed, then the newer data will have its own
+  CRC in place when it gets checked => hence no error. In theory at least!
+
+
+  Revision 1.2  2001/05/11 19:27:33  vipin
+  Added cmd line args to change serial port, and specify max size of
+  random files created. Some cleanup. Added -Wall to Makefile.
+
+  Revision 1.1  2001/05/11 16:06:28  vipin
+  Importing checkfs (the power fail test program) into CVS. This was
+  originally done for NEWS. NEWS had a lot of version, this is
+  based off the last one done for NEWS. The "makefiles" program
+  is run once initially to create the files in the current dir.
+  "checkfs" is then run on every powerup to check consistancy
+  of the files. See checkfs.c for more details.
+
+
+*/
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <termios.h>
+#include <unistd.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <time.h>
+#include "common.h"
+
+
+
+extern int do_pwr_dn(int fd, int cycleCnt);
+
+#define CMDLINE_PORT "-p"
+#define CMDLINE_MAXFILEBYTES "-s"
+#define CMDLINE_MAXERROR "-e"
+#define CMDLINE_HELPSHORT "-?"
+#define CMDLINE_HELPLONG "--help"
+
+
+int CycleCount;
+
+char SerialDevice[255] = "/dev/ttyS0"; /* default, can be changed
+                                        through cmd line. */
+
+#define MAX_INTS_ALLOW 100000 /* max # of int's in the file written.
+                                 Statis limit to size struct. */
+float FileSizeMax = 1024.0; /*= (file size in bytes), MUST be float*/
+
+int MaxErrAllowed = 1; /* default, can ge changed thru cmd line*/
+
+
+/* Needed for CRC generation/checking */
+static const unsigned short crc_ccitt_table[] = {
+    0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
+    0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
+    0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
+    0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
+    0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
+    0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
+    0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
+    0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
+    0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
+    0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
+    0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
+    0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
+    0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
+    0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
+    0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
+    0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
+    0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
+    0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
+    0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
+    0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
+    0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
+    0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
+    0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
+    0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
+    0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
+    0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
+    0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
+    0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
+    0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
+    0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
+    0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
+    0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
+};
+
+
+/*
+  Set's up the Linux serial port. Must be passed string to device to
+  open. Parameters are fixed to 9600,e,1
+
+  [A possible enhancement to this program would be to pass these
+  parameters via the command line.]
+
+  Returns file descriptor to open port. Use this fd to write to port
+  and close it later, when done.
+*/
+int setupSerial (const char *dev) {
+    int i, fd;
+    struct termios tios;
+
+    fd = open(dev,O_RDWR | O_NDELAY );
+    if (fd < 0) {
+        fprintf(stderr, "%s: %s\n", dev, sys_errlist[errno]);
+        exit(1);
+    }
+    if (tcgetattr(fd, &tios) < 0) {
+        fprintf(stderr,"Could not get terminal attributes: %s",sys_errlist[errno]);
+        exit(1);
+    }
+
+    tios.c_cflag =
+        CS7 |
+        CREAD |			// Enable Receiver
+        HUPCL |			// Hangup after close
+        CLOCAL |                // Ignore modem control lines
+        PARENB;			// Enable parity (even by default)
+
+
+
+    tios.c_iflag      = IGNBRK; // Ignore break
+    tios.c_oflag      = 0;
+    tios.c_lflag      = 0;
+    for(i = 0; i < NCCS; i++) {
+        tios.c_cc[i] = '\0';           // no special characters
+    }
+    tios.c_cc[VMIN] = 1;
+    tios.c_cc[VTIME] = 0;
+
+    cfsetospeed (&tios, B9600);
+    cfsetispeed (&tios, B9600);
+
+    if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
+        fprintf(stderr,"Could not set attributes: ,%s",sys_errlist[errno]);
+        exit(1);
+    }
+    return fd;
+}
+
+
+
+
+
+//A portion of this code was taken from the AX.25 HDLC packet driver
+//in LINUX. Once I test and have a better understanding of what
+//it is doing, it will be better commented.
+
+//For now one can speculate that the CRC routine always expects the
+//CRC to calculate out to 0xf0b8 (the hardcoded value at the end)
+//and returns TRUE if it is and FALSE if it doesn't.
+//Why don't people document better!!!!
+int check_crc_ccitt(char *filename)
+{
+    FILE *fp;
+    FILE *logfp;
+    unsigned short crc = 0xffff;
+    int len;
+    char dataByte;
+    int retry;
+    char done;
+
+    fp =   fopen(filename,"rb");
+    if(!fp){
+        logfp = fopen("logfile","a"); /*open for appending only.*/
+        fprintf(logfp, "Verify checksum:Error! Cannot open filename passed for verify checksum: %s\n",filename);
+        fclose(logfp);
+        return FALSE;
+    }
+
+
+    /*the first int contains an int that is the length of the file in long.*/
+    if(fread(&len, sizeof(int), 1, fp) != 1){
+        logfp = fopen("logfile","a"); /*open for appending only.*/
+        fprintf(logfp, "verify checksum:Error reading from file: %s\n", filename);
+        fclose(fp);
+        fclose(logfp);
+        return FALSE;
+    }
+
+    /* printf("Checking %i bytes for CRC in \"%s\".\n", len, filename); */
+
+    /* Make sure that we did not read 0 as the number of bytes in file. This
+       check prevents a corrupt file with zero's in it from passing the
+       CRC test. A good file will always have some data in it. */
+    if(len == 0)
+    {
+
+        logfp = fopen("logfile","a"); /*open for appending only.*/
+        fprintf(logfp, "verify checksum: first int claims there are 0 data in file. Error!: %s\n", filename);
+        fclose(fp);
+        fclose(logfp);
+        return FALSE;
+    }
+
+
+    rewind(fp);
+    len+=2; /*the file has two extra bytes at the end, it's checksum. Those
+              two MUST also be included in the checksum calculation.
+            */
+
+    for (;len>0;len--){
+        retry=5; /*retry 5 times*/
+        done = FALSE;
+        while(!done){
+            if(fread(&dataByte, sizeof(char), 1, fp) != 1){
+                retry--;
+            }else{
+                done = TRUE;
+            }
+            if(retry == 0){
+                done = TRUE;
+            }
+        }
+        if(!retry){
+            logfp = fopen("logfile","a"); /*open for appending only.*/
+            fprintf(logfp, "Unexpected end of file: %s\n", filename);
+            fprintf(logfp, "...bytes left to be read %i.\n",len);
+            fclose(logfp);
+            fclose(fp);
+            return FALSE;
+        }
+        crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ dataByte) & 0xff];
+    }
+    fclose(fp);
+    if( (crc & 0xffff) != 0xf0b8){
+        /*printf("The CRC of read file:%x\n", crc); */
+        return FALSE;
+    }
+    return TRUE;
+}/*end check_crc_ccitt() */
+
+
+
+/*
+  Sends "OK to power me down" message to the remote
+  power cycling box, via the serial port.
+  Also updates the num power cycle count in a local
+  file.
+  This file "./cycleCnt" must be present. This is
+  initially (and once) created by the separate "makefiles.c"
+  program.
+*/
+void send_pwrdn_ok(void){
+
+    int fd;
+    FILE *cyclefp;
+    int cycle_fd;
+
+    cyclefp =   fopen("cycleCnt","rb");
+    if(!cyclefp){
+        printf("expecting file \"cycleCnt\". Cannot continue.\n");
+        exit(1);
+    }
+    if(fread(&CycleCount, sizeof(CycleCount),1,cyclefp) != 1){
+        fprintf(stderr, "Error! Unexpected end of file cycleCnt.\n");
+        exit(1);
+    }
+    fclose(cyclefp);
+
+    CycleCount++;
+
+    /*now write this puppy back*/
+    cyclefp  = fopen("cycleCnt","wb");
+    cycle_fd = fileno(cyclefp);
+    if(!cyclefp){
+        fprintf(stderr, "Error! cannot open file for write:\"cycleCnt\". Cannot continue.\n");
+        exit(1);
+    }
+    if(fwrite(&CycleCount, sizeof(CycleCount), 1,cyclefp) !=1){
+        fprintf(stderr, "Error writing to file cycleCnt. Cannot continue.\n");
+        exit(1);
+    }
+    if(fdatasync(cycle_fd)){
+        fprintf(stderr, "Error! cannot sync file buffer with disk.\n");
+        exit(1);
+    }
+
+    fclose(cyclefp);
+    (void)sync();
+
+    printf("\n\n Sending Power down command to the remote box.\n");
+    fd = setupSerial(SerialDevice);
+
+    if(do_pwr_dn(fd, CycleCount) < 0)
+    {
+        fprintf(stderr, "Error sending power down command.\n");
+        exit(1);
+    }
+
+    close(fd);
+}//end send_pwrnd_ok()
+
+
+
+
+/*
+  Appends 16bit CRC at the end of numBytes long buffer.
+  Make sure buf, extends at least 2 bytes beyond.
+ */
+void appendChecksum(char *buf, int numBytes){
+
+    unsigned short crc = 0xffff;
+    int index = 0;
+
+    /* printf("Added CRC (2 bytes) to %i bytes.\n", numBytes); */
+
+    for (; numBytes > 0; numBytes--){
+
+        crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ buf[index++]) & 0xff];
+    }
+    crc ^= 0xffff;
+    /*printf("The CRC: %x\n\n", crc);*/
+
+    buf[index++] = crc;
+    buf[index++] = crc >> 8;
+
+
+
+}/*end checksum()*/
+
+
+
+
+
+/*
+  This guy make a new "random data file" with the filename
+  passed to it. This file is checksummed with the checksum
+  stored at the end. The first "int" in the file is the
+  number of int's in it (this is needed to know how much
+  data to read and checksum later).
+*/
+void make_new_file(char *filename){
+
+
+    int dfd; /* data file descriptor */
+    int rand_data;
+    int data_size;
+    int temp_size;
+    int dataIndex = 0;
+    int err;
+
+
+    struct {
+        int sizeInBytes; /* must be int */
+        int dataInt[MAX_INTS_ALLOW+1]; /* how many int's can we write? */
+    }__attribute((packed)) dataBuf;
+
+
+    fprintf(stderr, "Creating File:%s. ", filename);
+
+    if((dfd = open(filename, O_RDWR | O_CREAT | O_SYNC)) <= 0)
+    {
+        printf("Error! Cannot open file: %s\n",filename);
+        perror("Error");
+        exit(1);
+    }
+
+    /*now write a bunch of random binary data to the file*/
+    /*first figure out how much data to write. That is random also.*/
+
+    /*file should not be less than 5 ints long. (so that we have decent length files,
+      that's all)*/
+    while(
+	((data_size = (int)(1+(int)((FileSizeMax/sizeof(int))*rand()/(RAND_MAX+1.0)))) < 5)
+    );
+
+    /* printf("Writing %i ints to the file.\n", data_size); */
+
+    temp_size = data_size * sizeof(int);
+
+    /* Make sure that all data is written in one go! This is important to
+       check for reliability of file systems like JFFS/JFFS that purport to
+       have "reliable" writes during powre fail.
+     */
+
+    dataBuf.sizeInBytes = temp_size;
+
+    data_size--; /*one alrady written*/
+    dataIndex = 0;
+
+    while(data_size--){
+        rand_data =  (int)(1 + (int)(10000.0*rand()/(RAND_MAX+1.0)));
+
+        dataBuf.dataInt[dataIndex++] = rand_data;
+
+    }
+
+    /*now calculate the file checksum and append it to the end*/
+    appendChecksum((char *)&dataBuf, dataBuf.sizeInBytes);
+
+    /* Don't forget to increase the size of data written by the 2 chars of CRC at end.
+     These 2 bytes are NOT included in the sizeInBytes field. */
+    if((err = write(dfd, (void *)&dataBuf, dataBuf.sizeInBytes + sizeof(short))) <
+       (dataBuf.sizeInBytes + sizeof(short))
+    )
+    {
+        printf("Error writing data buffer to file. Written %i bytes rather than %i bytes.",
+               err, dataBuf.sizeInBytes);
+        perror("Error");
+        exit(1);
+    }
+
+    /* Now that the data is (hopefully) safely written. I can truncate the file to the new
+       length so that I can reclaim any unused space, if the older file was larger.
+     */
+    if(ftruncate(dfd, dataBuf.sizeInBytes + sizeof(short)) < 0)
+    {
+        perror("Error: Unable to truncate file.");
+        exit(1);
+    }
+
+
+    close(dfd);
+
+
+}//end make_new_file()
+
+
+
+/*
+  Show's help on stdout
+ */
+void printHelp(char **argv)
+{
+    printf("Usage:%s <options, defined below>\n", argv[0]);
+    printf("%s </dev/ttyS0,1,2...>: Set com port to send ok to pwr dn msg on\n",
+           CMDLINE_PORT);
+    printf("%s <n>: Set Max size in bytes of each file to be created.\n",
+           CMDLINE_MAXFILEBYTES);
+    printf("%s <n>: Set Max errors allowed when checking all files for CRC on start.\n",
+           CMDLINE_MAXERROR);
+    printf("%s or %s: This Help screen.\n", CMDLINE_HELPSHORT,
+           CMDLINE_HELPLONG);
+
+}/* end printHelp()*/
+
+
+
+void processCmdLine(int argc, char **argv)
+{
+
+    int cnt;
+
+    /* skip past name of this program, process rest */
+    for(cnt = 1; cnt < argc; cnt++)
+    {
+        if(strcmp(argv[cnt], CMDLINE_PORT) == 0)
+        {
+            strncpy(SerialDevice, argv[++cnt], sizeof(SerialDevice));
+            continue;
+        }else
+            if(strcmp(argv[cnt], CMDLINE_MAXFILEBYTES) == 0)
+            {
+                FileSizeMax = (float)atoi(argv[++cnt]);
+                if(FileSizeMax > (MAX_INTS_ALLOW*sizeof(int)))
+                {
+                    printf("Max file size allowd is %i.\n",
+                           MAX_INTS_ALLOW*sizeof(int));
+                    exit(0);
+                }
+
+                continue;
+            }else
+                if(strcmp(argv[cnt], CMDLINE_HELPSHORT) == 0)
+                {
+                    printHelp(argv);
+                    exit(0);
+
+                }else
+                    if(strcmp(argv[cnt], CMDLINE_HELPLONG) == 0)
+                    {
+                        printHelp(argv);
+                        exit(0);
+                    }else
+
+                        if(strcmp(argv[cnt], CMDLINE_MAXERROR) == 0)
+                        {
+                            MaxErrAllowed = atoi(argv[++cnt]);
+                        }
+                        else
+                        {
+                            printf("Unknown cmd line option:%s\n", argv[cnt]);
+                            printHelp(argv);
+                            exit(0);
+
+                        }
+    }
+
+
+}/* end processCmdLine() */
+
+
+
+
+
+int main(int argc, char **argv){
+
+    FILE *logfp;
+    int log_fd;
+    char filename[30];
+    short filenameCounter = 0;
+    unsigned short counter;
+    unsigned short numberFiles;
+    char error = FALSE;
+    short errorCnt = 0;
+    time_t timep;
+    char * time_string;
+    unsigned int seed;
+
+
+    numberFiles = MAX_NUM_FILES;
+
+    if(argc >= 1)
+    {
+        processCmdLine(argc, argv);
+    }
+
+
+    /*
+      First open MAX_NUM_FILES and make sure that the checksum is ok.
+      Also make an intry into the logfile.
+    */
+    /* timestamp! */
+    time(&timep);
+    time_string = (char *)ctime((time_t *)&timep);
+
+    /*start a new check, make a log entry and continue*/
+    logfp = fopen("logfile","a"); /*open for appending only.*/
+    log_fd = fileno(logfp);
+    fprintf(logfp,"%s", time_string);
+    fprintf(logfp,"Starting new check.\n");
+    if(fdatasync(log_fd) == -1){
+        fprintf(stderr,"Error! Cannot sync file data with disk.\n");
+        exit(1);
+    }
+
+    fclose(logfp);
+    (void)sync();
+
+    /*
+      Now check all random data files in this dir.
+    */
+    for(counter=0;counter<MAX_NUM_FILES;counter++){
+
+        fprintf(stderr, "%i.", counter);
+
+        /*create the filename in sequence. The number of files
+          to check and the algorithm to create the filename is
+          fixed and known in advance.*/
+        sprintf(filename,"file%i",filenameCounter++);
+
+        if(!check_crc_ccitt(filename)){
+            /*oops, checksum does not match. Make an entry into the log file
+              and decide if we can continue or not.*/
+            fprintf(stderr, "crcError:%s ", filename);
+            logfp = fopen("logfile","a"); /*open for appending only.*/
+            log_fd = fileno(logfp);
+            fprintf(logfp,"CRC error in file: %s\n", filename);
+            if(fdatasync(log_fd) == -1){
+                fprintf(stderr,"Error! Cannot sync file data with disk.\n");
+                exit(1);
+            }
+            fclose(logfp);
+            (void)sync();
+
+            error = TRUE;
+            errorCnt++;
+
+            if(errorCnt > MaxErrAllowed){
+                logfp = fopen("logfile","a"); /*open for appending only.*/
+                log_fd = fileno(logfp);
+                fprintf(logfp,"\nMax Error count exceed. Stopping!\n");
+                if(fdatasync(log_fd) == -1){
+                    fprintf(stderr,"Error! Cannot sync file data with disk.\n");
+                    exit(1);
+                }
+                fclose(logfp);
+                (void)sync();
+
+                fprintf(stderr, "Too many errors. See \"logfile\".\n");
+                exit(1);
+            }/* if too many errors */
+
+            /*we have decided to continue, however first repair this file
+              so that we do not cumulate errors across power cycles.*/
+            make_new_file(filename);
+        }
+    }//for
+
+    /*all files checked, make a log entry and continue*/
+    logfp = fopen("logfile","a"); /*open for appending only.*/
+    log_fd = fileno(logfp);
+    fprintf(logfp,"All files checked. Total errors found: %i\n\n", errorCnt);
+    if(fdatasync(log_fd)){
+        fprintf(stderr, "Error! cannot sync file buffer with disk.\n");
+        exit(1);
+    }
+
+    fclose(logfp);
+    (void)sync();
+
+    /*now send a message to the remote power box and have it start a random
+      pwer down timer after which power will be killed to this unit.
+    */
+    send_pwrdn_ok();
+
+    /*now go into a forever loop of writing to files and CRC'ing them on
+      a continious basis.*/
+
+    /*start from a random file #*/
+    /*seed rand based on the current time*/
+    seed = (unsigned int)time(NULL);
+    srand(seed);
+
+    filenameCounter=(int)(1+(int)((float)(MAX_NUM_FILES-1)*rand()/(RAND_MAX+1.0)));
+
+    while(1){
+
+        for(;filenameCounter<MAX_NUM_FILES;filenameCounter++){
+
+            /*create the filename in sequence*/
+            sprintf(filename,"file%i",filenameCounter);
+            make_new_file(filename);
+        }
+        filenameCounter = 0;
+    }
+
+    exit(0); /* though we will never reach here, but keeps the compiler happy*/
+}/*end main()*/
diff --git a/tests/checkfs/comm.c b/tests/checkfs/comm.c
new file mode 100644
index 0000000..57fc7ed
--- /dev/null
+++ b/tests/checkfs/comm.c
@@ -0,0 +1,67 @@
+/*
+  File: comm.c
+  Desc: This file implements the actual transmission portion
+  of the "ok to power me down" message to the remote
+  power cycling black box.
+
+  It's been sepatated into a separate file so that
+  it may be replaced by any other comm mechanism desired.
+
+  (including none or non serial mode at all)
+
+  $Id: comm.c,v 1.3 2005/11/07 11:15:17 gleixner Exp $
+  $Log: comm.c,v $
+  Revision 1.3  2005/11/07 11:15:17  gleixner
+  [MTD / JFFS2] Clean up trailing white spaces
+
+  Revision 1.2  2001/06/21 23:07:18  dwmw2
+  Initial import to MTD CVS
+
+  Revision 1.1  2001/06/08 22:26:05  vipin
+  Split the modbus comm part of the program (that sends the ok to pwr me down
+  message) into another file "comm.c"
+
+
+
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+
+
+/*
+  This is the routine that forms and
+  sends the "ok to pwr me down" message
+  to the remote power cycling "black box".
+
+ */
+int do_pwr_dn(int fd, int cycleCnt)
+{
+
+    char buf[200];
+
+    sprintf(buf, "ok to power me down!\nCount = %i\n", cycleCnt);
+
+    if(write(fd, buf, strlen(buf)) < strlen(buf))
+    {
+        perror("write error");
+        return -1;
+    }
+
+    return 0;
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/tests/checkfs/common.h b/tests/checkfs/common.h
new file mode 100644
index 0000000..1d33f8b
--- /dev/null
+++ b/tests/checkfs/common.h
@@ -0,0 +1,7 @@
+/* $Id: common.h,v 1.1 2001/06/21 23:07:56 dwmw2 Exp $ */
+//this .h file is common to both the file creation utility and
+//the file checking utility.
+#define TRUE    1
+#define FALSE   0
+
+#define MAX_NUM_FILES    100
diff --git a/tests/checkfs/makefiles.c b/tests/checkfs/makefiles.c
new file mode 100644
index 0000000..662fe86
--- /dev/null
+++ b/tests/checkfs/makefiles.c
@@ -0,0 +1,264 @@
+/*
+
+ * Copyright Daniel Industries.
+
+ * Created by: Vipin Malik (vipin.malik@daniel.com)
+ *
+ * This is GPL code. See the file COPYING for more details
+ *
+ * Software distributed under the Licence is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing rights and
+ * limitations under the Licence.
+
+ * $Id: makefiles.c,v 1.2 2005/11/07 11:15:17 gleixner Exp $
+
+This program creates MAX_NUM_FILES files (file00001, file00002 etc) and
+fills them with random numbers till they are a random length. Then it checksums
+the files (with the checksum as the last two bytes) and closes the file.
+
+The fist int is the size of the file in bytes.
+
+It then opens another file and the process continues.
+
+The files are opened in the current dir.
+
+*/
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "common.h"
+
+#define FILESIZE_MAX    20000.0 /* for each file in sizeof(int). Must be a float #
+                                   Hence, 20000.0 = 20000*4 = 80KB max file size
+                                 */
+
+static const unsigned short crc_ccitt_table[] = {
+	0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
+	0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
+	0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
+	0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
+	0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
+	0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
+	0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
+	0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
+	0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
+	0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
+	0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
+	0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
+	0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
+	0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
+	0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
+	0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
+	0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
+	0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
+	0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
+	0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
+	0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
+	0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
+	0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
+	0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
+	0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
+	0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
+	0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
+	0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
+	0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
+	0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
+	0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
+	0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
+};
+
+//This code was taken from the AX.25 HDLC packet driver
+//in LINUX. Once I test and have a better understanding of what
+//it is doing, it will be better commented.
+
+//For now one can speculate that the CRC routine always expects the
+//CRC to calculate out to 0xf0b8 (the hardcoded value at the end)
+//and returns TRUE if it is and FALSE if it doesn't.
+//Why don't people document better!!!!
+void check_crc_ccitt(char *filename)
+{
+  FILE *fp;
+  unsigned short crc = 0xffff;
+  int len;
+  char dataByte;
+  int retry;
+
+  fp =   fopen(filename,"rb");
+  if(!fp){
+    printf("Verify checksum:Error! Cannot open filename passed for verify checksum: %s\n",filename);
+    exit(1);
+  }
+  /*the first int contains an int that is the length of the file in long.*/
+  if(fread(&len, sizeof(int), 1, fp) != 1){
+    printf("verify checksum:Error reading from file: %s", filename);
+    fclose(fp);
+    exit(1);
+  }
+  rewind(fp);
+  len+=2; /*the file has two extra bytes at the end, it's checksum. Those
+	   two MUST also be included in the checksum calculation.
+	  */
+
+  for (;len>0;len--){
+    retry=5; /*retry 5 times*/
+    while(!fread(&dataByte, sizeof(char), 1, fp) && retry--);
+    if(!retry){
+      printf("Unexpected error reading from file: %s\n", filename);
+      printf("...bytes left to be read %i.\n\n",len);
+      fclose(fp);
+      exit(1);
+    }
+    crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ dataByte) & 0xff];
+  }
+  fclose(fp);
+  if( (crc & 0xffff) != 0xf0b8){
+    printf("Verify checksum: Error in file %s.\n\n",filename);
+    exit(1);
+  }
+}//end check_crc_ccitt()
+
+
+
+/*this routine opens a file 'filename' and checksumn's the entire
+ contents, and then appends the checksum at the end of the file,
+ closes the file and returns.
+*/
+void checksum(char *filename){
+
+  FILE *fp;
+  unsigned short crc = 0xffff;
+  int len;
+  char dataByte;
+  int retry;
+
+  fp =   fopen(filename,"rb");
+  if(!fp){
+    printf("Error! Cannot open filename passed for checksum: %s\n",filename);
+    exit(1);
+  }
+  /*the first int contains an int that is the length of the file in longs.*/
+  if(fread(&len, sizeof(int), 1, fp) != 1){
+    printf("Error reading from file: %s", filename);
+    fclose(fp);
+    exit(1);
+  }
+  printf("Calculating checksum on %i bytes.\n",len);
+  rewind(fp); /*the # of bytes int is also included in the checksum.*/
+
+  for (;len>0;len--){
+    retry=5; /*retry 5 times*/
+    while(!fread(&dataByte, sizeof(char), 1, fp) && retry--);
+    if(!retry){
+      printf("Unexpected error reading from file: %s\n", filename);
+      printf("...bytes left to be read %i.\n\n",len);
+      fclose(fp);
+      exit(1);
+    }
+    crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ dataByte) & 0xff];
+  }
+  crc ^= 0xffff;
+  printf("The CRC: %x\n\n", crc);
+
+  /*the CRC has been calculated. now close the file and open it in append mode*/
+  fclose(fp);
+
+  fp =   fopen(filename,"ab"); /*open in append mode. CRC goes at the end.*/
+  if(!fp){
+    printf("Error! Cannot open filename to update checksum: %s\n",filename);
+    exit(1);
+  }
+  if(fwrite(&crc, sizeof(crc), 1, fp) != 1){
+    printf("error! unable to update the file for checksum.\n");
+    fclose(fp);
+    exit(1);
+  }
+  fflush(fp);
+  fclose(fp);
+
+
+}/*end checksum()*/
+
+
+
+int main(void){
+
+  FILE *fp, *cyclefp;
+  int cycleCount;
+  int rand_data;
+  int data_size;
+  int temp_size;
+  char filename[30];
+  short filenameCounter = 0;
+  unsigned short counter;
+  unsigned short numberFiles;
+
+  numberFiles = MAX_NUM_FILES;
+
+  for(counter=0;counter<numberFiles;counter++){
+    /*create the filename in sequence*/
+    sprintf(filename,"file%i",filenameCounter++);
+    fp =   fopen(filename,"wb");
+    if(!fp){
+      printf("Error! Cannot open file: %s\n",filename);
+      exit(1);
+    }
+    /*now write a bunch of random binary data to the file*/
+    /*first figure out how much data to write. That is random also.*/
+
+    while(
+	  ((data_size = (int)(1 + (int)(FILESIZE_MAX*rand()/(RAND_MAX+1.0)))) < 100)
+	  )/*file should not be less than 100 ints long. (so that we have decent length files, that's all)*/
+
+    printf("Writing %i ints to the file.\n", data_size);
+
+    temp_size = data_size * sizeof(int);
+
+    if(!fwrite(&temp_size, sizeof(int), 1, fp)){
+      printf("File write error!!.\n");
+      fclose(fp);
+      exit(1);
+    }
+    data_size--; /*one alrady written*/
+
+    while(data_size--){
+      rand_data =  (int)(1 + (int)(10000.0*rand()/(RAND_MAX+1.0)));
+      if(!fwrite(&rand_data, sizeof(int), 1, fp)){
+	printf("File write error!!.\n");
+	fclose(fp);
+	exit(1);
+      }
+    }
+    fflush(fp);
+    fclose(fp);
+    /*now calculate the file checksum and append it to the end*/
+    checksum(filename);
+    /*this is just a test. Check the CRC to amek sure that it is OK.*/
+    check_crc_ccitt(filename);
+  }
+
+  /*now make a file called "cycleCnt" and put a binary (int)0 in it.
+   This file keeps count as to how many cycles have taken place!*/
+  cyclefp =   fopen("cycleCnt","wb");
+  if(!cyclefp){
+    printf("cannot open file \"cycleCnt\". Cannot continue.\n");
+    exit(1);
+  }
+  cycleCount = 0;
+  if(fwrite(&cycleCount, sizeof(cycleCount), 1,cyclefp) !=1){
+    printf("Error writing to file cycleCnt. Cannot continue.\n");
+    exit(1);
+  }
+  fclose(cyclefp);
+  exit(0);
+
+}/*end main()*/
+
+
+
+
+
+
+