Messages in this thread | | | Date | Fri, 23 Feb 2001 22:18:56 +0100 | From | Erik Mouw <> | Subject | reiserfs: still problems with tail conversion |
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Hi all,
I am running linux-2.4.2-pre4 with Chris Mason's tailconversion bug fix applied, but I still have problems with null bytes in files. I wrote a little test program that clearly shows the problem:
/* reisertest.c: test for tailconversion bug in reiserfs * * Compile with: gcc -O2 -o reisertest reisertest.c */ #include <stdio.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h>
#define MAXBYTES 8192
int main(int argc, char *argv[]) { int fd; int i; char name[32]; char buf[MAXBYTES]; char check[MAXBYTES]; memset(buf, 0x55, MAXBYTES);
fprintf(stderr, "Creating %d files ... ", MAXBYTES);
for(i = 0; i < MAXBYTES; i++) { sprintf(name, "reiser-%05d.test", i); fd = open(name, O_WRONLY | O_CREAT, 0644); write(fd, buf, i); close(fd); }
fprintf(stderr, "done\n"); fprintf(stderr, "Appending to the files ... ");
for(i = 0; i < MAXBYTES; i++) { sprintf(name, "reiser-%05d.test", i); fd = open(name, O_WRONLY | O_APPEND); write(fd, buf, MAXBYTES - i); close(fd); }
fprintf(stderr, "done\n"); fprintf(stderr, "Checking files for null bytes ...\n");
for(i = 0; i < MAXBYTES; i++) { sprintf(name, "reiser-%05d.test", i); fd = open(name, O_RDONLY); read(fd, check, MAXBYTES); if(memcmp(buf, check, MAXBYTES) != 0) fprintf(stderr, " %s contains null bytes\n", name); }
fprintf(stderr, "Checking done\n");
return 0; }
When I run this on a reiserfs partition, I get output like this:
erik@arthur:~/reisertest/foo> ../reisertest Creating 8192 files ... done Appending to the files ... done Checking files for null bytes ... reiser-00193.test contains null bytes reiser-00220.test contains null bytes reiser-00256.test contains null bytes reiser-00289.test contains null bytes reiser-00329.test contains null bytes reiser-00338.test contains null bytes reiser-00374.test contains null bytes reiser-00407.test contains null bytes reiser-00415.test contains null bytes reiser-00430.test contains null bytes reiser-00438.test contains null bytes reiser-00445.test contains null bytes reiser-00459.test contains null bytes reiser-00481.test contains null bytes reiser-00501.test contains null bytes reiser-00508.test contains null bytes reiser-00521.test contains null bytes reiser-00534.test contains null bytes reiser-00558.test contains null bytes reiser-00577.test contains null bytes reiser-00583.test contains null bytes reiser-00600.test contains null bytes reiser-00606.test contains null bytes reiser-00612.test contains null bytes reiser-00623.test contains null bytes reiser-00634.test contains null bytes reiser-00645.test contains null bytes reiser-00665.test contains null bytes reiser-00685.test contains null bytes reiser-00730.test contains null bytes reiser-00735.test contains null bytes reiser-00740.test contains null bytes reiser-00745.test contains null bytes reiser-00750.test contains null bytes reiser-00759.test contains null bytes reiser-00764.test contains null bytes reiser-00773.test contains null bytes reiser-00778.test contains null bytes reiser-00787.test contains null bytes reiser-00796.test contains null bytes reiser-00805.test contains null bytes reiser-00814.test contains null bytes reiser-00866.test contains null bytes reiser-00915.test contains null bytes reiser-00930.test contains null bytes reiser-00934.test contains null bytes reiser-00938.test contains null bytes reiser-00942.test contains null bytes reiser-00946.test contains null bytes reiser-00950.test contains null bytes reiser-00954.test contains null bytes reiser-00958.test contains null bytes reiser-00965.test contains null bytes reiser-00969.test contains null bytes reiser-00973.test contains null bytes reiser-00977.test contains null bytes reiser-00984.test contains null bytes reiser-00988.test contains null bytes reiser-00995.test contains null bytes reiser-00999.test contains null bytes reiser-01006.test contains null bytes reiser-01010.test contains null bytes reiser-01017.test contains null bytes Checking done
Running the test a couple of times doesn't really show a pattern, sometimes the same files contains null bytes, sometimes others do. The files with null bytes seem to be with index < 1024.
I did the same test with an ext2 filesystem, but didn't see any error. System is SuSE 7.0, compiler gcc-2.95.2.
Erik
-- J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department of Electrical Engineering, Faculty of Information Technology and Systems, Delft University of Technology, PO BOX 5031, 2600 GA Delft, The Netherlands Phone: +31-15-2783635 Fax: +31-15-2781843 Email: J.A.K.Mouw@its.tudelft.nl WWW: http://www-ict.its.tudelft.nl/~erik/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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