Changeset 629 for trunk/kernel/fs/fatfs.h

Timestamp:

May 17, 2019, 9:27:04 AM (5 years ago)

Author:

alain

Message:

Remove the "giant" rwlock protecting the GPT, and
use the GPT_LOCKED attribute in each PTE to prevent
concurrent modifications of one GPT entry.
The version number has been incremented to 2.1.

File:

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

trunk/kernel/fs/fatfs.h

@@ -181 +181 @@
  *
  * 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.
+ * <free_clusters>, <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 
+ * (cluster 0). It is used 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.
  ****************************************************************************************/
@@ -202 +201 @@
 
     /* 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                 */