Implement StatFS for various VFS2 filesystems.

This mainly involved enabling kernfs' client filesystems to provide a
StatFS implementation.

Fixes #3411, #3515.

PiperOrigin-RevId: 329009864

1 files changed, 12 insertions, 0 deletions

diff --git a/test/syscalls/linux/pipe.cc b/test/syscalls/linux/pipe.cc
index 34291850d..c097c9187 100644
--- a/test/syscalls/linux/pipe.cc
+++ b/test/syscalls/linux/pipe.cc
@@ -13,7 +13,9 @@
 // limitations under the License.
 
 #include <fcntl.h> /* Obtain O_* constant definitions */
+#include <linux/magic.h>
 #include <sys/ioctl.h>
+#include <sys/statfs.h>
 #include <sys/uio.h>
 #include <unistd.h>
 
@@ -198,6 +200,16 @@ TEST_P(PipeTest, NonBlocking) {
               SyscallFailsWithErrno(EWOULDBLOCK));
 }
 
+TEST(PipeTest, StatFS) {
+  int fds[2];
+  ASSERT_THAT(pipe(fds), SyscallSucceeds());
+  struct statfs st;
+  EXPECT_THAT(fstatfs(fds[0], &st), SyscallSucceeds());
+  EXPECT_EQ(st.f_type, PIPEFS_MAGIC);
+  EXPECT_EQ(st.f_bsize, getpagesize());
+  EXPECT_EQ(st.f_namelen, NAME_MAX);
+}
+
 TEST(Pipe2Test, CloExec) {
   int fds[2];
   ASSERT_THAT(pipe2(fds, O_CLOEXEC), SyscallSucceeds());