Changeset 606 for trunk/kernel/mm/page.h

Timestamp:

Dec 3, 2018, 12:20:18 PM (6 years ago)

Author:

alain

Message:

Improve the FAT32 file system to support cat, rm, cp commands.

File:

• trunk/kernel/mm/page.h (modified) (4 diffs)

trunk/kernel/mm/page.h

@@ -37 +37 @@
 /*************************************************************************************
  * This  defines the flags that can be attached to a physical page.
- * TODO : the PG_BUFFER and PG_IO_ERR flags semantic is not defined
+ * TODO : the PG_BUFFER and PG_IO_ERR flags semantic is not defined [AG]
  ************************************************************************************/
 
@@ -43 +43 @@
 #define PG_RESERVED         0x0002     // cannot be allocated by PPM
 #define PG_FREE             0x0004     // page can be allocated by PPM
-#define PG_INLOAD           0x0008     // on-going load from disk
 #define PG_IO_ERR           0x0010     // mapper signals access error    TODO ??? [AG]
 #define PG_BUFFER           0x0020     // used in blockio.c              TODO ??? [AG]
@@ -49 +48 @@
 #define PG_COW          0x0080     // page is copy-on-write
 
-#define PG_ALL          0xFFFF     // All flags
-
 /*************************************************************************************
  * This structure defines a physical page descriptor.
- * The busylock is used to test/modify the forks counter.
- * NOTE: Size is 44 bytes for a 32 bits core...
- * TODO : the refcount use has to be clarified [AG]
+ * - The remote_busylock is used to allows any remote thread to atomically
+ *   test/modify the forks counter or the page flags.
+ * - The list entry is used to register the page in a free list or in dirty list.
+ * NOTE: Size is 48 bytes for a 32 bits core.
+ * TODO : the refcount use is not defined [AG]
  ************************************************************************************/
 
@@ -67 +66 @@
         uint32_t          refcount;       /*! reference counter TODO ??? [AG]      (4)  */
         uint32_t          forks;          /*! number of pending forks              (4)  */
-        remote_busylock_t lock;           /*! protect all accesses to page         (12) */
+        remote_busylock_t lock;           /*! protect forks or flags modifs        (16) */
 }
 page_t;