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Diffstat (limited to 'checkfs/checkfs.c')
| -rw-r--r-- | checkfs/checkfs.c | 695 |
1 files changed, 695 insertions, 0 deletions
diff --git a/checkfs/checkfs.c b/checkfs/checkfs.c new file mode 100644 index 0000000..da2d0c4 --- /dev/null +++ b/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()*/ |