Christoph Hellwig wrote:
> On Fri, Jan 29, 2010 at 02:05:46PM -0600, Eric Sandeen wrote:
>> Testcase from Giel de Nijs <giel@xxxxxxxxxxxxxx>
>> on linux-ext4 list, ""Possible ext4 data corruption
>> with large files and async I/O," on 29 Jan 2010
>>
>> ext4 put byte offsets in a block offset u32 container
>> in the endio struct, so 4g wrapped to 0 leading to
>> data corruption when the unwritten extent did not
>> get converted.
>
> There's various type messups in the test program that make it fail for
oops, thanks for checking.
> me on a 32-bit machine. The patch below fixes it up, but it seems like
> we should rather add a variant of that code as aio_read/write commands
> to xfs_io instead of adding a new test program.
ok, that's probably better - again, though, it takes at least a release
cycle before most folks can test it. But I guess that's not the end of
the world.
-Eric
> Index: xfstests-dev/src/aio-write.c
> ===================================================================
> --- xfstests-dev.orig/src/aio-write.c 2010-01-30 10:42:24.000000000 +0000
> +++ xfstests-dev/src/aio-write.c 2010-01-30 10:45:30.000000000 +0000
> @@ -42,7 +42,7 @@ void usage(void)
> /*
> * Scale value by kilo, mega, or giga.
> */
> -loff_t scale_by_kmg(long long value, char scale)
> +long long scale_by_kmg(long long value, char scale)
> {
> switch (scale) {
> case 'g':
> @@ -69,7 +69,7 @@ switch (scale) {
> int main(int argc, char ** argv)
> {
> char filename[PATH_MAX];
> - loff_t offset = 0;
> + long long offset = 0;
> size_t length = 0;
> int seed = 0xFF;
> int queue_depth = 8;
> @@ -95,12 +95,12 @@ int main(int argc, char ** argv)
> seed = (int)strtol(optarg, &endp, 0);
> break;
> case 'o':
> - offset = strtol(optarg, &endp, 0);
> - offset = scale_by_kmg((long long)offset, *endp);
> + offset = strtoll(optarg, &endp, 0);
> + offset = scale_by_kmg(offset, *endp);
> break;
> case 'l':
> length = strtol(optarg, &endp, 0);
> - length = scale_by_kmg((long long)length, *endp);
> + length = scale_by_kmg(length, *endp);
> break;
> case 'v':
> verbose++;
> @@ -141,7 +141,8 @@ int main(int argc, char ** argv)
> io_prep_pwrite(&iocb, fd, buf, length, offset);
> iocblist[0] = &iocb;
> if (verbose)
> - printf("submitting write of %zd bytes at offset %zd\n", length, offset);
> + printf("submitting write of %zd bytes at offset %lld\n",
> + length, offset);
> err = io_submit(io_ctx, 1, iocblist);
> if (err < 0) {
> printf("error submitting I/O requests: %s\n", strerror(-err));
>
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