1 files changed, 12 insertions, 16 deletions

diff --git a/src/kernel/drive.c b/src/kernel/drive.c
index 2ae050f..8dc0e68 100644
--- a/src/kernel/drive.c
+++ b/src/kernel/drive.c
@@ -1,6 +1,7 @@
 #include "drive.h"
 #include "panic.h"
 #include "fat.h"
+#include "log.h"
 
 uint8_t n_drives;
 struct drive drives[256];
@@ -14,21 +15,9 @@ static file_id_t unknown_get_file(const struct drive *d, const char *path) {
   return 0;
 }
 
-static void unknown_free_file(const struct drive *d, file_id_t fid) {
-  PANIC("Free file called on unknown file system.");
-}
-
-static void unknown_load_sector(const struct drive *d, file_id_t fid, uint32_t sector, void *at) {
-  PANIC("Load sector called on unknown file system.");
-}
-
-static uint32_t unknown_get_file_length(const struct drive *d, file_id_t fid) {
-  PANIC("Get file length called on unknown file system.");
-}
-
 __attribute__ ((const))
 static uint32_t unknown_get_free_sectors(const struct drive *d) {
-  return -1;
+  return 0;
 }
 
 __attribute__ ((const))
@@ -41,15 +30,22 @@ static uint32_t unknown_n_dir_entries(const struct drive *d, const char *path) {
   return 0;
 }
 
+static void unknown_no_call(const struct drive *d) {
+  logf(LOG_ERROR, "file-level operation called on drive %u (%s), which is an unknown file system", d - drives + 1, d->fs_type);
+}
+
 static inline void determine_fs(struct drive *d) {
   if (try_fat_init_drive(d))
     return;
 
   d->fs_type = "Unknown";
   d->get_file = &unknown_get_file;
-  d->free_file = &unknown_free_file;
-  d->load_sector = &unknown_load_sector;
-  d->get_file_length = &unknown_get_file_length;
+  d->free_file = &unknown_no_call;
+  d->load_sector = &unknown_no_call;
+  d->save_sector = &unknown_no_call;
+  d->is_writable = &unknown_no_call;
+  d->get_file_length = &unknown_no_call;
+  d->set_file_length = &unknown_no_call;
   d->enumerate_dir = &unknown_enumerate_dir;
   d->n_dir_entries = &unknown_n_dir_entries;
   d->get_free_sectors = &unknown_get_free_sectors;