diff options
Diffstat (limited to 'tests/sys/fs/fusefs/write.cc')
| -rw-r--r-- | tests/sys/fs/fusefs/write.cc | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/tests/sys/fs/fusefs/write.cc b/tests/sys/fs/fusefs/write.cc index 1fe2e3cc522d..f5573a865a04 100644 --- a/tests/sys/fs/fusefs/write.cc +++ b/tests/sys/fs/fusefs/write.cc @@ -32,9 +32,11 @@ extern "C" { #include <sys/param.h> #include <sys/mman.h> #include <sys/resource.h> +#include <sys/socket.h> #include <sys/stat.h> #include <sys/time.h> #include <sys/uio.h> +#include <sys/un.h> #include <aio.h> #include <fcntl.h> @@ -1398,6 +1400,77 @@ TEST_F(WriteBackAsync, eof) leak(fd); } +/* + * Nothing bad should happen if a file with a dirty writeback cache is closed + * while the last copy lies in some socket's socket buffer. Inspired by bug + * 289686 . + */ +TEST_F(WriteBackAsync, scm_rights) +{ + const char FULLPATH[] = "mountpoint/some_file.txt"; + const char RELPATH[] = "some_file.txt"; + const char *CONTENTS = "abcdefgh"; + uint64_t ino = 42; + int fd; + ssize_t bufsize = strlen(CONTENTS); + int s[2]; + struct msghdr msg; + struct iovec iov; + char message[CMSG_SPACE(sizeof(int))]; + union { + char buf[CMSG_SPACE(sizeof(fd))]; + struct cmsghdr align; + } u; + + expect_lookup(RELPATH, ino, 0); + expect_open(ino, 0, 1); + /* VOP_SETATTR will try to set timestamps during flush */ + EXPECT_CALL(*m_mock, process( + ResultOf([=](auto in) { + return (in.header.opcode == FUSE_SETATTR && + in.header.nodeid == ino); + }, Eq(true)), + _) + ).WillOnce(Invoke(ReturnImmediate([=](auto in __unused, auto& out) { + SET_OUT_HEADER_LEN(out, attr); + out.body.attr.attr.ino = ino; + out.body.attr.attr.mode = S_IFREG | 0644; + out.body.attr.attr.size = bufsize; + }))); + + expect_write(ino, 0, bufsize, bufsize, CONTENTS); + expect_flush(ino, 1, ReturnErrno(0)); + expect_release(ino, ReturnErrno(0)); + + /* Open a file on the fusefs file system */ + fd = open(FULLPATH, O_RDWR); + ASSERT_LE(0, fd) << strerror(errno); + + /* Write to the file to dirty its writeback cache */ + ASSERT_EQ(bufsize, write(fd, CONTENTS, bufsize)) << strerror(errno); + + /* Send the file into a socket */ + ASSERT_EQ(0, socketpair(AF_UNIX, SOCK_STREAM, 0, s)) << strerror(errno); + memset(&message, 0, sizeof(message)); + memset(&msg, 0, sizeof(msg)); + iov.iov_base = NULL; + iov.iov_len = 0; + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + msg.msg_control = u.buf, + msg.msg_controllen = sizeof(u.buf); + struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg); + cmsg->cmsg_level = SOL_SOCKET; + cmsg->cmsg_type = SCM_RIGHTS; + cmsg->cmsg_len = CMSG_LEN(sizeof(fd)); + memcpy(CMSG_DATA(cmsg), &fd, sizeof(fd)); + ASSERT_GE(sendmsg(s[0], &msg, 0), 0) << strerror(errno); + + close(fd); // Close fd within our process + close(s[0]); + close(s[1]); // The last copy of fd is within this socket's rcvbuf +} + /* * When a file has dirty writes that haven't been flushed, the server's notion * of its mtime and ctime will be wrong. The kernel should ignore those if it |