dosfs: Support ctime and mtime

Implement ctime and mtime updates according to POSIX.  The ctime is
mapped to the FAT create time and date.  The mtime is mapped to the FAT
last modified time and date.  For the atime use the mtime for
simplicity.

1 files changed, 34 insertions, 0 deletions

diff --git a/cpukit/libfs/src/dosfs/fat_file.c b/cpukit/libfs/src/dosfs/fat_file.c
index 2899f1b414..1f20926884 100644
--- a/cpukit/libfs/src/dosfs/fat_file.c
+++ b/cpukit/libfs/src/dosfs/fat_file.c
@@ -165,6 +165,38 @@ fat_file_reopen(fat_file_fd_t *fat_fd)
     return RC_OK;
 }
 
+int
+fat_file_update(fat_fs_info_t *fs_info, fat_file_fd_t *fat_fd)
+{
+    int ret_rc = RC_OK;
+
+    /*
+     * if fat-file descriptor is not marked as "removed", synchronize
+     * size, first cluster number, write time and date fields of the file
+     */
+    if (!FAT_FILE_IS_REMOVED(fat_fd))
+    {
+        int rc;
+
+        if (fat_fd->fat_file_type == FAT_FILE)
+        {
+            rc = fat_file_write_first_cluster_num(fs_info, fat_fd);
+            if (rc != RC_OK)
+                ret_rc = rc;
+
+            rc = fat_file_write_file_size(fs_info, fat_fd);
+            if (rc != RC_OK)
+                ret_rc = rc;
+        }
+
+        rc = fat_file_write_time_and_date(fs_info, fat_fd);
+        if (rc != RC_OK)
+            ret_rc = rc;
+    }
+
+    return ret_rc;
+}
+
 /* fat_file_close --
  *     Close fat-file. If count of links to fat-file
  *     descriptor is greater than 1 (i.e. somebody esle holds pointer
@@ -204,6 +236,8 @@ fat_file_close(
     {
         uint32_t key = fat_construct_key(fs_info, &fat_fd->dir_pos.sname);
 
+        fat_file_update(fs_info, fat_fd);
+
         if (fat_fd->flags & FAT_FILE_REMOVED)
         {
             rc = fat_file_truncate(fs_info, fat_fd, 0);