Routix/include/fs/blockcache.h

   1 /* block.h */
   2
   3 #ifndef __BLOCK_CACHE
   4 #define __BLOCK_CACHE
   5
   6 #include <routix/device.h>
   7 #include <routix/task.h>
   8 #include <routix/system.h>
   9 #include <sys/list.h>
  10
  11 // Cache
  12 typedef enum block_state { READ_LOCKED, WRITE_LOCKED, SYNCRONIZING, UNLOCKED, DIRTY } block_state;
  13
  14 typedef struct block_cache_t {
  15         device_t device;
  16         word sector;
  17         byte *buffer;
  18
  19         // Estado del bloque
  20         block_state state;
  21         unsigned int lock_count;                                                                                                                /// \var cantidad de locks sobre el bloque
  22
  23         // Info para el driver
  24         operation_t operation;
  25         int ret;
  26
  27         LIST_NEW(task_struct_t)         pending_process_list;                   // lista de procesos en espera por este bloque
  28         LIST_DATA(block_cache_t)        free;                                                                                   // puede pertenecer a una lista de bloques libres
  29         LIST_DATA(block_cache_t)        cached;                                                                         // puede pertenecer a una lista contenida en un hash
  30         LIST_DATA(block_cache_t)        driver_request_list;                    // puede pertenecer a una lista de requests a un driver
  31
  32 } block_cache_t;
  33
  34 #define BLOCK_CACHE_DEVICE(bf)                  ((bf)->device)
  35 #define BLOCK_CACHE_SECTOR(bf)                  ((bf)->sector)
  36 #define BLOCK_CACHE_BUFFER(bf)                  ((bf)->buffer)
  37 #define BLOCK_CACHE_STATE(bf)                   ((bf)->state)
  38 #define BLOCK_CACHE_LOCKCOUNT(bf)               ((bf)->lock_count)
  39 #define BLOCK_CACHE_OPERATION(bf)               ((bf)->operation)
  40 #define BLOCK_CACHE_RETURN(bf)                  ((bf)->ret)
  41 #define BLOCK_CACHE_PENDING_PROCESS_LIST(bf)            ((bf)->pending_process_list)
  42
  43 #define DRIVER_REQUEST_DEVICE(bf)               ((bf)->device)
  44 #define DRIVER_REQUEST_SECTOR(bf)               ((bf)->sector)
  45 #define DRIVER_REQUEST_BUFFER(bf)               ((bf)->buffer)
  46 #define DRIVER_REQUEST_STATE(bf)                ((bf)->state)
  47 #define DRIVER_REQUEST_OPERATION(bf)    ((bf)->operation)
  48 #define DRIVER_REQUEST_RETURN(bf)               ((bf)->ret)
  49
  50 // Definiciones
  51 #define BLOCK_SIZE      512
  52
  53
  54 // Funciones
  55 void start_block_cache(int totalmemory);
  56
  57 block_cache_t *getrequest(device_t device);
  58 inline void sendrequest(block_cache_t *block);
  59 inline void endrequest(block_cache_t *block);
  60 int cache_read(device_t device, word sector, unsigned int start, char *dstbuffer, unsigned int len);
  61
  62 // Funciones locales de debug
  63 void show_cached_list(void);
  64
  65
  66 #define CACHE_READ(device,sector,buffer)        ( cache_read(device,sector,0,buffer,BLOCK_SIZE) )
  67
  68
  69 #endif