mount: make FEATURE_MOUNT_NFS not needed for Linux 2.6.23+
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/util-linux/Config.src b/util-linux/Config.src
index 888bc8f..57a52ce 100644
--- a/util-linux/Config.src
+++ b/util-linux/Config.src
@@ -485,13 +485,18 @@
This also enables label or uuid support for swapon.
config FEATURE_MOUNT_NFS
- bool "Support mounting NFS file systems"
- default y
+ bool "Support mounting NFS file systems on Linux < 2.6.23"
+ default n
depends on MOUNT
select FEATURE_HAVE_RPC
select FEATURE_SYSLOG
help
- Enable mounting of NFS file systems.
+ Enable mounting of NFS file systems on Linux kernels prior
+ to version 2.6.23. Note that in this case mounting of NFS
+ over IPv6 will not be possible.
+
+ Note that this option links in RPC support from libc,
+ which is rather large (~10 kbytes on uclibc).
config FEATURE_MOUNT_CIFS
bool "Support mounting CIFS/SMB file systems"
diff --git a/util-linux/mount.c b/util-linux/mount.c
index 1dd4c0c..7ae1981 100644
--- a/util-linux/mount.c
+++ b/util-linux/mount.c
@@ -1144,7 +1144,7 @@
pathname = s + 1;
*s = '\0';
/* Ignore all but first hostname in replicated mounts
- until they can be fully supported. (mack@sgi.com) */
+ * until they can be fully supported. (mack@sgi.com) */
s = strchr(hostname, ',');
if (s) {
*s = '\0';
@@ -1683,7 +1683,6 @@
/* Perform actual mount */
do_mount:
- mp->mnt_type = (char*)"nfs";
retval = mount_it_now(mp, vfsflags, (char*)&data);
goto ret;
@@ -1708,8 +1707,43 @@
#else // !ENABLE_FEATURE_MOUNT_NFS
-// Never called. Call should be optimized out.
-int nfsmount(struct mntent *mp, long vfsflags, char *filteropts);
+/* Linux 2.6.23+ supports nfs mounts with options passed as a string.
+ * For older kernels, you must build busybox with ENABLE_FEATURE_MOUNT_NFS.
+ * (However, note that then you lose any chances that NFS over IPv6 would work).
+ */
+static int nfsmount(struct mntent *mp, long vfsflags, char *filteropts)
+{
+ len_and_sockaddr *lsa;
+ char *opts;
+ char *end;
+ char *dotted;
+ int ret;
+
+# if ENABLE_FEATURE_IPV6
+ end = strchr(mp->mnt_fsname, ']');
+ if (end && end[1] == ':')
+ end++;
+ else
+# endif
+ /* mount_main() guarantees that ':' is there */
+ end = strchr(mp->mnt_fsname, ':');
+
+ *end = '\0';
+ lsa = xdotted2sockaddr(mp->mnt_fsname, /*port:*/ 0);
+ *end = ':';
+ dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
+ if (ENABLE_FEATURE_CLEAN_UP) free(lsa);
+ opts = xasprintf("%s%saddr=%s",
+ filteropts ? filteropts : "",
+ filteropts ? "," : "",
+ dotted
+ );
+ if (ENABLE_FEATURE_CLEAN_UP) free(dotted);
+ ret = mount_it_now(mp, vfsflags, opts);
+ if (ENABLE_FEATURE_CLEAN_UP) free(opts);
+
+ return ret;
+}
#endif // !ENABLE_FEATURE_MOUNT_NFS
@@ -1800,10 +1834,11 @@
}
// Might this be an NFS filesystem?
- if (ENABLE_FEATURE_MOUNT_NFS
- && (!mp->mnt_type || strcmp(mp->mnt_type, "nfs") == 0)
+ if ((!mp->mnt_type || strncmp(mp->mnt_type, "nfs", 3) == 0)
&& strchr(mp->mnt_fsname, ':') != NULL
) {
+ if (!mp->mnt_type)
+ mp->mnt_type = (char*)"nfs";
rc = nfsmount(mp, vfsflags, filteropts);
goto report_error;
}