Hi Vyacheslav
I've been curious as to what within the "darcs whatsnew" was causing the
"nilfs_direct_assign: invalid pointer: 0" / "broken bmap" issue for 1kB
blocks and I had a quiet half hour today, so I've boiled it down to a
simpler script and a short bit of C. I include both below just in case
you should find them useful. I was surprised to see that the 'a' makes
it to the file despite the filesystem errors.
Kind regards,
Anthony
Script:
VG=unencrypted
gcc -Wall truncate_mmap.c
#lvcreate --size 2G --name ntest $VG
mkfs.nilfs2 -b 1024 -B 8192 /dev/mapper/$VG-ntest
mkdir /var/tmp/n
mkdir /var/tmp/n/ntest
mount /dev/mapper/$VG-ntest /var/tmp/n/ntest
cd /var/tmp/n/ntest
sleep 2
date
dmesg|tail -n 5
$OLDPWD/a.out
date
sleep 8
dmesg|tail -n 5
truncate_mmap.c:
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <unistd.h>
#define handle_error(msg) \
do { perror(msg); exit(EXIT_FAILURE); } while (0)
int main()
{
char *addr;
int fd;
int t;
int c;
size_t size = 60;
fd = open("truncate_mmap.tst", O_RDWR|O_CREAT|O_NOCTTY);
if (fd == -1)
handle_error("open");
t = ftruncate(fd, (off_t) size);
if (t != 0)
handle_error("ftruncate");
addr = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if (addr == MAP_FAILED)
handle_error("mmap");
addr[0] = 'a';
c = close(fd);
if (c != 0)
handle_error("close");
exit(EXIT_SUCCESS);
}
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