mount: handle list of comma-separated fs types in -t option

Allows one to specify list of filesystem types to be
tried when mounting particular device. E.g.

 mount -t vfat,ext2 ...
Signed-off-by: Karol Lewandowski <k.lewandowsk@samsung.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 12 insertions, 3 deletions

diff --git a/util-linux/mount.c b/util-linux/mount.c
index fddd7fba9..f94b6e643 100644
--- a/util-linux/mount.c
+++ b/util-linux/mount.c
@@ -38,7 +38,7 @@
 //usage:        )
 //usage:     "\n        -r              Read-only mount"
 //usage:     "\n        -w              Read-write mount (default)"
-//usage:     "\n        -t FSTYPE       Filesystem type"
+//usage:     "\n        -t FSTYPE[,...] Filesystem type(s)"
 //usage:     "\n        -O OPT          Mount only filesystems with option OPT (-a only)"
 //usage:     "\n-o OPT:"
 //usage:        IF_FEATURE_MOUNT_LOOP(
@@ -1827,7 +1827,16 @@ static int singlemount(struct mntent *mp, int ignore_busy)
         // If we know the fstype (or don't need to), jump straight
         // to the actual mount.
         if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) {
-                rc = mount_it_now(mp, vfsflags, filteropts);
+                char *next;
+                for (;;) {
+                        next = mp->mnt_type ? strchr(mp->mnt_type, ',') : NULL;
+                        if (next)
+                                *next = '\0';
+                        rc = mount_it_now(mp, vfsflags, filteropts);
+                        if (rc == 0 || !next)
+                                break;
+                        mp->mnt_type = next + 1;
+                }
         } else {
                 // Loop through filesystem types until mount succeeds
                 // or we run out
@@ -1844,7 +1853,7 @@ static int singlemount(struct mntent *mp, int ignore_busy)
                 for (fl = fslist; fl; fl = fl->link) {
                         mp->mnt_type = fl->data;
                         rc = mount_it_now(mp, vfsflags, filteropts);
-                        if (!rc)
+                        if (rc == 0)
                                 break;
                 }
         }