X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=utils%2Fmount%2Fmount.c;h=96b56973faeeb3731dcd98d74a51d216c5378fcf;hp=2dc0aec7ec84249460115c0997c9ab82f3d2db11;hb=f014bb7f4dbdc45572849465a6410512abffa7ea;hpb=28e4224b9bbfc355c83e17df74c47221afacd560;ds=sidebyside

diff --git a/utils/mount/mount.c b/utils/mount/mount.c
index 2dc0aec..96b5697 100644
--- a/utils/mount/mount.c
+++ b/utils/mount/mount.c
@@ -26,6 +26,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/mount.h>
+#include <sys/utsname.h>
 #include <getopt.h>
 #include <mntent.h>
 #include <pwd.h>
@@ -43,6 +44,7 @@
 #include "error.h"
 
 char *progname;
+int nfs_mount_data_version;
 int nomtab;
 int verbose;
 int sloppy;
@@ -128,6 +130,51 @@ static const struct opt_map opt_map[] = {
   { NULL,	0, 0, 0		}
 };
 
+#define MAKE_VERSION(p,q,r)	(65536 * (p) + 256 * (q) + (r))
+
+int linux_version_code(void)
+{
+	struct utsname my_utsname;
+	int p, q, r;
+
+	if (uname(&my_utsname) == 0) {
+		p = atoi(strtok(my_utsname.release, "."));
+		q = atoi(strtok(NULL, "."));
+		r = atoi(strtok(NULL, "."));
+		return MAKE_VERSION(p,q,r);
+	}
+	return 0;
+}
+
+/*
+ * Choose the version of the nfs_mount_data structure that is appropriate
+ * for the kernel that is doing the mount.
+ *
+ * NFS_MOUNT_VERSION:		maximum version supported by these sources
+ * nfs_mount_data_version:	maximum version supported by the running kernel
+ */
+static void discover_nfs_mount_data_version(void)
+{
+	int kernel_version = linux_version_code();
+
+	if (kernel_version) {
+		if (kernel_version < MAKE_VERSION(2, 1, 32))
+			nfs_mount_data_version = 1;
+		else if (kernel_version < MAKE_VERSION(2, 2, 18))
+			nfs_mount_data_version = 3;
+		else if (kernel_version < MAKE_VERSION(2, 3, 0))
+			nfs_mount_data_version = 4;
+		else if (kernel_version < MAKE_VERSION(2, 3, 99))
+			nfs_mount_data_version = 3;
+		else if (kernel_version < MAKE_VERSION(2, 6, 3))
+			nfs_mount_data_version = 4;
+		else
+			nfs_mount_data_version = 6;
+	}
+	if (nfs_mount_data_version > NFS_MOUNT_VERSION)
+		nfs_mount_data_version = NFS_MOUNT_VERSION;
+}
+
 /* Try to build a canonical options string.  */
 static char * fix_opts_string (int flags, const char *extra_opts) {
 	const struct opt_map *om;
@@ -362,6 +409,8 @@ int main(int argc, char *argv[])
 
 	progname = basename(argv[0]);
 
+	discover_nfs_mount_data_version();
+
 	if(!strncmp(progname, "umount", strlen("umount"))) {
 		if(argc < 2) {
 			umount_usage();