diff options
| -rw-r--r-- | tools/testing/selftests/mm/gup_longterm.c | 6 | ||||
| -rw-r--r-- | tools/testing/selftests/mm/map_populate.c | 8 | ||||
| -rw-r--r-- | tools/testing/selftests/mm/vm_util.h | 18 |
3 files changed, 22 insertions, 10 deletions
diff --git a/tools/testing/selftests/mm/gup_longterm.c b/tools/testing/selftests/mm/gup_longterm.c index 03271442aae5..21595b20bbc3 100644 --- a/tools/testing/selftests/mm/gup_longterm.c +++ b/tools/testing/selftests/mm/gup_longterm.c @@ -97,11 +97,7 @@ static void do_test(int fd, size_t size, enum test_type type, bool shared) if (ftruncate(fd, size)) { if (errno == ENOENT) { - /* - * This can happen if the file has been unlinked and the - * filesystem doesn't support truncating unlinked files. - */ - ksft_test_result_skip("ftruncate() failed with ENOENT\n"); + skip_test_dodgy_fs("ftruncate()"); } else { ksft_test_result_fail("ftruncate() failed (%s)\n", strerror(errno)); } diff --git a/tools/testing/selftests/mm/map_populate.c b/tools/testing/selftests/mm/map_populate.c index 433e54fb634f..9df2636c829b 100644 --- a/tools/testing/selftests/mm/map_populate.c +++ b/tools/testing/selftests/mm/map_populate.c @@ -18,6 +18,8 @@ #include <unistd.h> #include "../kselftest.h" +#include "vm_util.h" + #define MMAP_SZ 4096 #define BUG_ON(condition, description) \ @@ -88,11 +90,7 @@ int main(int argc, char **argv) ret = ftruncate(fileno(ftmp), MMAP_SZ); if (ret < 0 && errno == ENOENT) { - /* - * This probably means tmpfile() made a file on a filesystem - * that doesn't handle temporary files the way we want. - */ - ksft_exit_skip("ftruncate(fileno(tmpfile())) gave ENOENT, weird filesystem?\n"); + skip_test_dodgy_fs("ftruncate()"); } BUG_ON(ret, "ftruncate()"); diff --git a/tools/testing/selftests/mm/vm_util.h b/tools/testing/selftests/mm/vm_util.h index 0e629586556b..6effafdc4d8a 100644 --- a/tools/testing/selftests/mm/vm_util.h +++ b/tools/testing/selftests/mm/vm_util.h @@ -5,6 +5,7 @@ #include <err.h> #include <strings.h> /* ffsl() */ #include <unistd.h> /* _SC_PAGESIZE */ +#include "../kselftest.h" #define BIT_ULL(nr) (1ULL << (nr)) #define PM_SOFT_DIRTY BIT_ULL(55) @@ -32,6 +33,23 @@ static inline unsigned int pshift(void) return __page_shift; } +/* + * Plan 9 FS has bugs (at least on QEMU) where certain operations fail with + * ENOENT on unlinked files. See + * https://gitlab.com/qemu-project/qemu/-/issues/103 for some info about such + * bugs. There are rumours of NFS implementations with similar bugs. + * + * Ideally, tests should just detect filesystems known to have such issues and + * bail early. But 9pfs has the additional "feature" that it causes fstatfs to + * pass through the f_type field from the host filesystem. To avoid having to + * scrape /proc/mounts or some other hackery, tests can call this function when + * it seems such a bug might have been encountered. + */ +static inline void skip_test_dodgy_fs(const char *op_name) +{ + ksft_test_result_skip("%s failed with ENOENT. Filesystem might be buggy (9pfs?)\n", op_name); +} + uint64_t pagemap_get_entry(int fd, char *start); bool pagemap_is_softdirty(int fd, char *start); bool pagemap_is_swapped(int fd, char *start); |