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selftests: add test for specifying 500 lower layers

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Verify that we can actually specify 500 lower layers and fail at the
501st one.

Link: https://lore.kernel.org/r/20241015-leiht-filmabend-a86eed4ff304@brauner
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2024-10-15 13:15:29 +02:00
parent 58439f6c48
commit d59dfd625a
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1 changed files with 65 additions and 0 deletions
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65
tools/testing/selftests/filesystems/overlayfs/set_layers_via_fds.c
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@ -149,4 +149,69 @@ TEST_F(set_layers_via_fds, set_layers_via_fds)
ASSERT_EQ(fclose(f_mountinfo), 0); ASSERT_EQ(fclose(f_mountinfo), 0);
} }
TEST_F(set_layers_via_fds, set_500_layers_via_fds)
{
int fd_context, fd_tmpfs, fd_overlay, fd_work, fd_upper, fd_lower;
int layer_fds[500] = { [0 ... 499] = -EBADF };
ASSERT_EQ(unshare(CLONE_NEWNS), 0);
ASSERT_EQ(sys_mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL), 0);
fd_context = sys_fsopen("tmpfs", 0);
ASSERT_GE(fd_context, 0);
ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0);
fd_tmpfs = sys_fsmount(fd_context, 0, 0);
ASSERT_GE(fd_tmpfs, 0);
ASSERT_EQ(close(fd_context), 0);
for (int i = 0; i < ARRAY_SIZE(layer_fds); i++) {
char path[100];
sprintf(path, "l%d", i);
ASSERT_EQ(mkdirat(fd_tmpfs, path, 0755), 0);
layer_fds[i] = openat(fd_tmpfs, path, O_DIRECTORY);
ASSERT_GE(layer_fds[i], 0);
}
ASSERT_EQ(mkdirat(fd_tmpfs, "w", 0755), 0);
fd_work = openat(fd_tmpfs, "w", O_DIRECTORY);
ASSERT_GE(fd_work, 0);
ASSERT_EQ(mkdirat(fd_tmpfs, "u", 0755), 0);
fd_upper = openat(fd_tmpfs, "u", O_DIRECTORY);
ASSERT_GE(fd_upper, 0);
ASSERT_EQ(mkdirat(fd_tmpfs, "l501", 0755), 0);
fd_lower = openat(fd_tmpfs, "l501", O_DIRECTORY);
ASSERT_GE(fd_lower, 0);
ASSERT_EQ(sys_move_mount(fd_tmpfs, "", -EBADF, "/tmp", MOVE_MOUNT_F_EMPTY_PATH), 0);
ASSERT_EQ(close(fd_tmpfs), 0);
fd_context = sys_fsopen("overlay", 0);
ASSERT_GE(fd_context, 0);
ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "workdir", NULL, fd_work), 0);
ASSERT_EQ(close(fd_work), 0);
ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "upperdir", NULL, fd_upper), 0);
ASSERT_EQ(close(fd_upper), 0);
for (int i = 0; i < ARRAY_SIZE(layer_fds); i++) {
ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[i]), 0);
ASSERT_EQ(close(layer_fds[i]), 0);
}
ASSERT_NE(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, fd_lower), 0);
ASSERT_EQ(close(fd_lower), 0);
ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0);
fd_overlay = sys_fsmount(fd_context, 0, 0);
ASSERT_GE(fd_overlay, 0);
ASSERT_EQ(close(fd_context), 0);
ASSERT_EQ(close(fd_overlay), 0);
}
TEST_HARNESS_MAIN TEST_HARNESS_MAIN