dissect: split list of discard-supporting fs out into mount-util.c

Let's manage the list of file systems that do a specific thing at one
place, following similar naming.

No functional changes.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/basic/mount-util.c b/src/basic/mount-util.c
index d8850bf83..6e6596d57 100644
--- a/src/basic/mount-util.c
+++ b/src/basic/mount-util.c
@@ -591,6 +591,18 @@ bool fstype_is_ro(const char *fstype) {
         return nulstr_contains(table, fstype);
 }
 
+bool fstype_can_discard(const char *fstype) {
+
+        static const char table[] =
+                "btrfs\0"
+                "ext4\0"
+                "vfat\0"
+                "xfs\0"
+                ;
+
+        return nulstr_contains(table, fstype);
+}
+
 int repeat_unmount(const char *path, int flags) {
         bool done = false;