Changeset 628 for trunk/kernel/fs/fatfs.h

Timestamp:

May 6, 2019, 1:28:01 PM (5 years ago)

Author:

alain

Message:

Introduce teh page_min / page_max mechanism in the fatfs_release_inode()
function, to avoid to scan all pages in FAT mapper.

File:

• trunk/kernel/fs/fatfs.h (modified) (2 diffs)

trunk/kernel/fs/fatfs.h

@@ -180 +180 @@
  *   functions to modify the FAT in both the FAT mapper and on IOC device.
  *
- * WARNING é : Almost all fields are constant values, but the <free_cluster_hint>, 
- * <free_clusters> and <lock> are shared variables. The <fs_info_buffer>, only
- * allocated in cluster 0, contains a copy of the FS_INFO sector. It is used by all
- * kernel instances to synchronously update the free clusters info on IOC device.
- * For these four variables, all kernel instances must use the values in cluster 0, 
- * containing the FAT mapper.
+ * WARNING 2 : Most fields are constant values, but the <free_cluster_hint>,
+ * <free_clusters>, <dirty_page_min>, <dirty_page_max>, <lock>, and the <fs_info_buffer>
+ * are shared variables, that can be modified by any thread running in any cluster.
+ * The <fs_info_buffer> contains a copy of the FS_INFO sector, and is only allocated in
+ * the FAT cluster (i.e. in cluster 0). It is used by all to synchronously update the 
+ * free clusters info on IOC device.
+ *  => For all these variables, only the values stored in the FAT cluster must be used.
  ****************************************************************************************/
 
@@ -201 +202 @@
 
     /* shared variables (only the copy in FAT cluster must be used)                     */
+    uint32_t            dirty_page_min;        /*! min dirty page index in FAT mapper   */
+    uint32_t            dirty_page_max;        /*! max dirty page index in FAT mapper   */
     uint32_t            free_cluster_hint;     /*! cluster[hint+1] is the first free    */
     uint32_t            free_clusters;         /*! free clusters number                 */