Changeset 4573a79 in mainline

Timestamp:

2008-05-08T21:29:24Z (17 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

2c4bbcde

Parents:

4797132

Message:

New first bits of fat_node_get().

File:

• uspace/srv/fs/fat/fat_ops.c (modified) (7 diffs)

uspace/srv/fs/fat/fat_ops.c

@@ -122 +122 @@
 #define FAT_CLST_LAST8  0xffff
 
-static block_t *fat_block_get(fat_node_t *nodep, off_t offset)
+#define fat_block_get(np, off) \
+    _fat_block_get((np)->idx->dev_handle, (np)->firstc, (off))
+
+static block_t *
+_fat_block_get(dev_handle_t dev_handle, fat_cluster_t fc, off_t offset)
 {
         block_t *bb;
@@ -135 +139 @@
         unsigned ssa;           /* size of the system area */
         unsigned clusters;
-        fat_cluster_t clst = nodep->firstc;
+        fat_cluster_t clst = fc;
         unsigned i;
 
-        bb = block_get(nodep->idx->dev_handle, BS_BLOCK);
+        bb = block_get(dev_handle, BS_BLOCK);
         bps = uint16_t_le2host(FAT_BS(bb)->bps);
         spc = FAT_BS(bb)->spc;
@@ -151 +155 @@
         ssa = rscnt + fatcnt * sf + rds;
 
-        if (nodep->idx->index == FAT_CLST_RES1) {
+        if (fc == FAT_CLST_RES1) {
                 /* root directory special case */
                 assert(offset < rds);
-                b = block_get(nodep->idx->dev_handle,
-                    rscnt + fatcnt * sf + offset);
+                b = block_get(dev_handle, rscnt + fatcnt * sf + offset);
                 return b;
         }
@@ -168 +171 @@
                 fidx = clst % (bps / sizeof(fat_cluster_t));
                 /* read FAT1 */
-                b = block_get(nodep->idx->dev_handle, rscnt + fsec);
+                b = block_get(dev_handle, rscnt + fsec);
                 clst = uint16_t_le2host(((fat_cluster_t *)b->data)[fidx]);
                 assert(clst != FAT_CLST_BAD);
@@ -175 +178 @@
         }
 
-        b = block_get(nodep->idx->dev_handle, ssa +
-            (clst - FAT_CLST_FIRST) * spc + offset % spc);
+        b = block_get(dev_handle, ssa + (clst - FAT_CLST_FIRST) * spc +
+            offset % spc);
 
         return b;
@@ -242 +245 @@
 
 /** Instantiate a FAT in-core node. */
-static void *
-fat_node_get(dev_handle_t dev_handle, fs_index_t index)
-{
-        return NULL;    /* TODO */
+static void *fat_node_get(dev_handle_t dev_handle, fs_index_t index)
+{
+        fat_idx_t *idx;
+        block_t *b;
+        fat_dentry_t *d;
+        fat_node_t *nodep;
+        unsigned bps;
+        unsigned dps;
+
+        idx = fat_idx_get_by_index(dev_handle, index);
+        if (!idx)
+                return NULL;
+
+        if (idx->nodep) {
+                /*
+                 * We are lucky.
+                 * The node is already instantiated in memory.
+                 */
+                idx->nodep->refcnt++;
+                return idx->nodep;
+        }
+
+        /*
+         * We must instantiate the node from the file system.
+         */
+        
+        assert(idx->pfc);
+
+        nodep = (fat_node_t *)malloc(sizeof(fat_node_t));
+        if (!nodep)
+                return NULL;
+        fat_node_initialize(nodep);
+
+        bps = fat_bps_get(dev_handle);
+        dps = bps / sizeof(fat_dentry_t);
+
+        b = _fat_block_get(dev_handle, idx->pfc,
+            (idx->pdi * sizeof(fat_dentry_t)) / bps);
+
+        assert(b);
+
+        d = ((fat_dentry_t *)b->data) + (idx->pdi % dps);
+        /* XXX */
 }
 
@@ -399 +441 @@
 static void *fat_root_get(dev_handle_t dev_handle)
 {
-        return fat_node_get(dev_handle, FAT_CLST_RES1);
+        return fat_node_get(dev_handle, 0);     /* TODO */
 }