diff options
Diffstat (limited to 'utils/exportfs/exportfs.c')
| -rw-r--r-- | utils/exportfs/exportfs.c | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/utils/exportfs/exportfs.c b/utils/exportfs/exportfs.c index da5fe21..00667e9 100644 --- a/utils/exportfs/exportfs.c +++ b/utils/exportfs/exportfs.c @@ -27,6 +27,10 @@ #include <netdb.h> #include <errno.h> #include <dirent.h> +#include <limits.h> +#include <time.h> + +#define INT_TO_LONG_THRESHOLD_SECS (INT_MAX - (60 * 60 * 24)) #include "sockaddr.h" #include "misc.h" @@ -406,17 +410,33 @@ unexportfs(char *arg, int verbose) static int can_test(void) { + char buf[1024]; int fd; int n; - char *setup = "nfsd 0.0.0.0 2147483647 -test-client-\n"; + fd = open("/proc/net/rpc/auth.unix.ip/channel", O_WRONLY); - if ( fd < 0) return 0; - n = write(fd, setup, strlen(setup)); + if (fd < 0) + return 0; + + /* + * We introduce tolerance of 1 day to ensure that we use a + * LONG_MAX for the expiry timestamp before it is actually + * needed. To use LONG_MAX, the kernel code must have + * commit 2f74f972 (sunrpc: prepare NFS for 2038). + */ + if (time(NULL) > INT_TO_LONG_THRESHOLD_SECS) + sprintf(buf, "nfsd 0.0.0.0 %ld -test-client-\n", LONG_MAX); + else + sprintf(buf, "nfsd 0.0.0.0 %d -test-client-\n", INT_MAX); + + n = write(fd, buf, strlen(buf)); close(fd); if (n < 0) return 0; + fd = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY); - if ( fd < 0) return 0; + if (fd < 0) + return 0; close(fd); return 1; } |