Changeset 6f2dfd1 in mainline for uspace

Timestamp:

2008-10-25T17:48:09Z (17 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

b4b7187

Parents:

8d32152

Message:

More complete prototype of fat_write().

File:

• uspace/srv/fs/fat/fat_ops.c (modified) (3 diffs)

uspace/srv/fs/fat/fat_ops.c

@@ -850 +850 @@
 }
 
-static void fat_fill_gap(fat_node_t *nodep, off_t start, off_t stop)
+static void
+fat_fill_gap(fat_node_t *nodep, fat_cluster_t mclst, off_t pos)
 {
         /* TODO */
+}
+
+static int
+fat_alloc_clusters(unsigned nclsts, fat_cluster_t *mcl, fat_cluster_t *lcl)
+{
+        return ENOTSUP; /* TODO */
+}
+
+static void
+fat_append_clusters(fat_node_t *nodep, fat_cluster_t mcl)
+{
 }
 
@@ -910 +922 @@
                  * next block size boundary.
                  */
-                if (pos > nodep->size) 
-                        fat_fill_gap(nodep, nodep->size, pos);
+                fat_fill_gap(nodep, FAT_CLST_RES0, pos);
                 b = fat_block_get(nodep, pos / bps);
                 (void) ipc_data_write_finalize(callid, b->data + pos % bps,
                     bytes);
                 b->dirty = true;                /* need to sync block */
+                block_put(b);
                 if (pos + bytes > nodep->size) {
                         nodep->size = pos + bytes;
                         nodep->dirty = true;    /* need to sync node */
                 }
-                block_put(b);
                 fat_node_put(nodep);
                 ipc_answer_1(rid, EOK, bytes);  
@@ -929 +940 @@
                  * clusters for the node and zero them out.
                  */
+                int status;
                 unsigned nclsts;
-                
+                fat_cluster_t mcl, lcl;
+        
                 nclsts = (ROUND_UP(pos + bytes, bps * spc) - clst_boundary) /
-                    bps * spc; 
-
-        }
-        
+                    bps * spc;
+                /* create an independent chain of nclsts clusters in all FATs */
+                status = fat_alloc_clusters(nclsts, &mcl, &lcl);
+                if (status != EOK) {
+                        /* could not allocate a chain of nclsts clusters */
+                        fat_node_put(nodep);
+                        ipc_answer_0(callid, status);
+                        ipc_answer_0(rid, status);
+                        return;
+                }
+                /* zero fill any gaps */
+                fat_fill_gap(nodep, mcl, pos);
+                b = _fat_block_get(dev_handle, lcl, (pos / bps) % spc);
+                (void) ipc_data_write_finalize(callid, b->data + pos % bps,
+                    bytes);
+                b->dirty = true;
+                block_put(b);
+                /*
+                 * Append the cluster chain starting in mcl to the end of the
+                 * node's cluster chain.
+                 */
+                fat_append_clusters(nodep, mcl);
+                nodep->size = pos + bytes;
+                nodep->dirty = true;
+                fat_node_put(nodep);
+                ipc_answer_1(rid, EOK, bytes);
+                return;
+        }
 }