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tests/qtest/migration: Add tests for file migration with direct-io

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The tests are only allowed to run in systems that know about the
O_DIRECT flag and in filesystems which support it.

Note: this also brings back migrate_set_parameter_bool() which went
away when we removed the compression tests. I copied it verbatim.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
This commit is contained in:
Fabiano Rosas 2024-06-17 15:57:28 -03:00
parent 9d70239e56
commit 408d295da8
3 changed files with 114 additions and 0 deletions
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44
tests/qtest/migration-helpers.c
View file

@ -18,6 +18,7 @@
#include "qapi/error.h"
#include "qapi/qmp/qlist.h"
#include "qemu/cutils.h"
#include "qemu/memalign.h"
#include "migration-helpers.h"
@ -473,3 +474,46 @@ void migration_test_add(const char *path, void (*fn)(void))
qtest_add_data_func_full(path, test, migration_test_wrapper,
migration_test_destroy);
}
#ifdef O_DIRECT
/*
* Probe for O_DIRECT support on the filesystem. Since this is used
* for tests, be conservative, if anything fails, assume it's
* unsupported.
*/
bool probe_o_direct_support(const char *tmpfs)
{
g_autofree char *filename = g_strdup_printf("%s/probe-o-direct", tmpfs);
int fd, flags = O_CREAT | O_RDWR | O_TRUNC | O_DIRECT;
void *buf;
ssize_t ret, len;
uint64_t offset;
fd = open(filename, flags, 0660);
if (fd < 0) {
unlink(filename);
return false;
}
/*
* Using 1MB alignment as conservative choice to satisfy any
* plausible architecture default page size, and/or filesystem
* alignment restrictions.
*/
len = 0x100000;
offset = 0x100000;
buf = qemu_try_memalign(len, len);
g_assert(buf);
ret = pwrite(fd, buf, len, offset);
unlink(filename);
g_free(buf);
if (ret < 0) {
return false;
}
return true;
}
#endif