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
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.
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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