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Fix writing of second backup superblock during grow 

There 'rv' tests were confused and sometimes wrong.
This resulted in not writing the second bsb.

Also fix the test script so the the critical section is long enough
that we have some hope of interrupting it.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2010-08-05 21:39:17 +10:00
parent 8d848be1ed
commit 7204495377
2 changed files with 21 additions and 9 deletions
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22
Grow.c
View File

@ -1350,17 +1350,21 @@ int grow_backup(struct mdinfo *sra,
bsb.sb_csum2 = bsb_csum((char*)&bsb,
((char*)&bsb.sb_csum2)-((char*)&bsb));
rv = -1;
if ((unsigned long long)lseek64(destfd[i], destoffsets[i] - 4096, 0)
!= destoffsets[i] - 4096)
rv = 1;
rv = rv ?: write(destfd[i], &bsb, 512);
break;
if (write(destfd[i], &bsb, 512) != 512)
break;
if (destoffsets[i] > 4096) {
if ((unsigned long long)lseek64(destfd[i], destoffsets[i]+stripes*chunk*odata, 0) !=
destoffsets[i]+stripes*chunk*odata)
rv = 1;
rv = rv ?: write(destfd[i], &bsb, 512);
break;
if (write(destfd[i], &bsb, 512) != 512)
break;
}
fsync(destfd[i]);
rv = 0;
}
return rv;
@ -1431,8 +1435,10 @@ int wait_backup(struct mdinfo *sra,
((char*)&bsb.sb_csum2)-((char*)&bsb));
if ((unsigned long long)lseek64(destfd[i], destoffsets[i]-4096, 0) !=
destoffsets[i]-4096)
rv = 1;
rv = rv ?: write(destfd[i], &bsb, 512);
rv = -1;
if (rv == 0 &&
write(destfd[i], &bsb, 512) != 512)
rv = -1;
fsync(destfd[i]);
}
return rv;
@ -1441,8 +1447,8 @@ int wait_backup(struct mdinfo *sra,
static void fail(char *msg)
{
int rv;
rv = write(2, msg, strlen(msg));
rv |= write(2, "\n", 1);
rv = (write(2, msg, strlen(msg)) != (int)strlen(msg));
rv |= (write(2, "\n", 1) != 1);
exit(rv ? 1 : 2);
}

8
tests/07reshape5intr
View File

@ -12,7 +12,13 @@ do
do dd if=/dev/urandom of=$d bs=1024 || true
done
mdadm -CR $md0 -amd -l5 -c 256 -n$disks --assume-clean $devs
case $disks in
2 | 3) chunk=1024;;
4 ) chunk=512;;
5 ) chunk=256;;
esac
mdadm -CR $md0 -amd -l5 -c $chunk -n$disks --assume-clean $devs
mdadm $md0 --add $dev6
echo 20 > /proc/sys/dev/raid/speed_limit_max
mdadm --grow $md0 -n $[disks+1]