Changeset 6aeab59c in mainline for uspace/app/mkexfat/mkexfat.c

Timestamp:

2012-02-22T21:42:36Z (12 years ago)

Author:

Maurizio Lombardi <m.lombardi85@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

367014a

Parents:

b0fecad

Message:

mkexfat: Initialize the allocation bitmap.

File:

• uspace/app/mkexfat/mkexfat.c (modified) (7 diffs)

uspace/app/mkexfat/mkexfat.c

@@ -81 +81 @@
         unsigned long rootdir_cluster;
         unsigned long total_clusters;
+        unsigned long allocated_clusters;
+        size_t   bitmap_size;
         size_t   sector_size;
         size_t   cluster_size;
@@ -97 +99 @@
 ebs_write(service_id_t service_id, exfat_cfg_t *cfg,
     int base, uint32_t *chksum);
+
+static int
+bitmap_write(service_id_t service_id, exfat_cfg_t *cfg);
 
 static void usage(void)
@@ -139 +144 @@
             cfg->fat_sector_count, cfg->cluster_size / cfg->sector_size);
 
+        /* Compute the bitmap size */
+        cfg->bitmap_size = n_req_clusters / 8;
+
+        cfg->allocated_clusters = div_round_up(cfg->bitmap_size,
+            cfg->cluster_size);
+
+        /* This account for the root directory */
+        cfg->allocated_clusters++;
+        /* FIXME: add upcase table clusters to allocated_clusters */
+
+        /* FIXME: set the real rootdir cluster */
         cfg->rootdir_cluster = 0;
 
@@ -312 +328 @@
         int rc;
 
-        pfat = calloc(cfg->fat_sector_count, cfg->sector_size);
+        pfat = calloc(cfg->sector_size, 1);
         if (!pfat)
                 return ENOMEM;
@@ -332 +348 @@
         memset(pfat, 0, 5 * sizeof(uint32_t));
 
-        for (i = 1; i < cfg->fat_sector_count + 1; ++i) {
+        for (i = 1; i < cfg->fat_sector_count; ++i) {
                 rc = block_write_direct(service_id,
                     FAT_SECTOR_START + i, 1, pfat);
@@ -341 +357 @@
 error:
         free(pfat);
+        return rc;
+}
+
+/** Initialize the allocation bitmap.
+ *
+ * @param service_id   The service id.
+ * @param cfg  Pointer to the exfat configuration structure.
+ * @return  EOK on success or a negative error code.
+ */
+static int
+bitmap_write(service_id_t service_id, exfat_cfg_t *cfg)
+{
+        unsigned long i, sec;
+        unsigned long allocated_cls;
+        int rc = EOK;
+
+        /* Bitmap size in sectors */
+        size_t const bss = div_round_up(cfg->bitmap_size, cfg->sector_size);
+
+        uint8_t *bitmap = malloc(cfg->sector_size);
+        if (!bitmap)
+                return ENOMEM;
+
+        allocated_cls = cfg->allocated_clusters;
+
+        for (sec = 0; sec < bss; ++sec) {
+                memset(bitmap, 0, cfg->sector_size);
+                if (allocated_cls > 0) {
+                        for (i = 0; i < allocated_cls; ++i) {
+                                unsigned byte_idx = i / 8;
+                                unsigned bit_idx = i % 8;
+
+                                if (byte_idx == cfg->sector_size)
+                                        break;
+                                bitmap[byte_idx] |= 1 << bit_idx;
+                        }
+
+                        allocated_cls -= i * 8;
+                }
+
+                rc = block_write_direct(service_id,
+                    cfg->data_start_sector + sec, 1, bitmap);
+                if (rc != EOK)
+                        goto exit;
+        }
+
+exit:
+        free(bitmap);
         return rc;
 }
@@ -459 +523 @@
         }
 
+        rc = bitmap_write(service_id, &cfg);
+        if (rc != EOK) {
+                printf(NAME ": Error, failed to write the allocation" \
+                    " bitmap to disk.\n");
+                return 2;
+        }
+
         return 0;
 }