Initial commit of progress, minimal formatting niave free list

emubd/lfs_emubd.c

@@ -18,6 +18,7 @@
 // Block device emulated on existing filesystem
 lfs_error_t lfs_emubd_create(lfs_emubd_t *emu, const char *path) {
     memset(&emu->info, 0, sizeof(emu->info));
+    memset(&emu->stats, 0, sizeof(emu->stats));
 
     // Allocate buffer for creating children files
     size_t pathlen = strlen(path);
@@ -64,8 +65,8 @@ lfs_error_t lfs_emubd_read(lfs_emubd_t *emu, uint8_t *buffer,
         return -EINVAL;
     }
 
-    // Default to some arbitrary value for debugging
-    memset(buffer, 0xcc, size);
+    // Zero out buffer for debugging
+    memset(buffer, 0, size);
 
     // Iterate over blocks until enough data is read
     while (size > 0) {
@@ -100,6 +101,7 @@ lfs_error_t lfs_emubd_read(lfs_emubd_t *emu, uint8_t *buffer,
         off = 0;
     }
 
+    emu->stats.read_count += 1;
     return 0;
 }
 
@@ -148,6 +150,7 @@ lfs_error_t lfs_emubd_write(lfs_emubd_t *emu, const uint8_t *buffer,
         off = 0;
     }
 
+    emu->stats.write_count += 1;
     return 0;
 }
 
@@ -175,6 +178,7 @@ lfs_error_t lfs_emubd_erase(lfs_emubd_t *emu,
         off = 0;
     }
 
+    emu->stats.erase_count += 1;
     return 0;
 }
 
@@ -188,6 +192,11 @@ lfs_error_t lfs_emubd_info(lfs_emubd_t *emu, struct lfs_bd_info *info) {
     return 0;
 }
 
+lfs_error_t lfs_emubd_stats(lfs_emubd_t *emu, struct lfs_bd_stats *stats) {
+    *stats = emu->stats;
+    return 0;
+}
+
 
 // Wrappers for void*s
 static lfs_error_t lfs_emubd_bd_read(void *bd, uint8_t *buffer,

emubd/lfs_emubd.h

@@ -11,11 +11,19 @@
 #include "lfs_bd.h"
 
 
+// Stats for debugging and optimization
+struct lfs_bd_stats {
+    lfs_lword_t read_count;
+    lfs_lword_t write_count;
+    lfs_lword_t erase_count;
+};
+
 // The emu bd state
 typedef struct lfs_emubd {
     char *path;
     char *child;
     struct lfs_bd_info info;
+    struct lfs_bd_stats stats;
 } lfs_emubd_t;
 
 
@@ -50,6 +58,11 @@ lfs_error_t lfs_emubd_sync(lfs_emubd_t *bd);
 // Any unknown information may be left unmodified
 lfs_error_t lfs_emubd_info(lfs_emubd_t *bd, struct lfs_bd_info *info);
 
+// Get stats of operations on the block device
+//
+// Used for debugging and optimizations
+lfs_error_t lfs_emubd_stats(lfs_emubd_t *bd, struct lfs_bd_stats *stats);
+
 // Block device operations
 extern const struct lfs_bd_ops lfs_emubd_ops;