Changeset 0e976d9b in mainline for uspace/srv/fs/exfat/exfat_ops.c

Timestamp:

2013-07-24T12:13:41Z (11 years ago)

Author:

Maurizio Lombardi <m.lombardi85@…>

Branches:

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

Children:

a39aac7

Parents:

5cd6c84

Message:

exfat: add the free_block_count() callback implementation.

File:

• uspace/srv/fs/exfat/exfat_ops.c (modified) (1 diff)

uspace/srv/fs/exfat/exfat_ops.c

@@ -935 +935 @@
 uint64_t exfat_free_block_count(service_id_t service_id)
 {
+        fs_node_t *node;
+        exfat_node_t *bmap_node;
         exfat_bs_t *bs;
+        uint64_t free_block_count = 0;
+        uint64_t block_count;
+        unsigned sector;
+        int rc;
+
+        block_count = exfat_total_block_count(service_id);
+
         bs = block_bb_get(service_id);
-        
-        uint64_t block_count = (DATA_CNT(bs) / 100) * 
-                        bs->allocated_percent;
-
-        return block_count;
+
+        rc = exfat_bitmap_get(&node, service_id);
+        if (rc != EOK)
+                goto exit;
+
+        bmap_node = (exfat_node_t *) node->data;
+
+        for (sector = 0; sector < bmap_node->size / BPS(bs); ++sector) {
+
+                block_t *block;
+                uint8_t *bitmap;
+                unsigned bit;
+
+                rc = exfat_block_get_by_clst(&block, bs, service_id,
+                    bmap_node->fragmented, bmap_node->firstc, NULL, sector,
+                    BLOCK_FLAGS_NONE);
+                if (rc != EOK) {
+                        free_block_count = 0;
+                        goto exit;
+                }
+
+                bitmap = (uint8_t *) block->data;
+
+                for (bit = 0; bit < BPS(bs) * 8 && block_count > 0;
+                    ++bit, --block_count) {
+                        if (!(bitmap[bit / 8] & (1 << (bit % 8))))
+                                ++free_block_count;
+                }
+
+                block_put(block);
+
+                if (block_count == 0) {
+                        /* Reached the end of the bitmap */
+                        goto exit;
+                }
+        }
+
+exit:
+        exfat_node_put(node);
+        return free_block_count;
 }