Changeset 48eb7a14 in mainline for uspace/srv/fs/fat/fat_idx.c

Timestamp:

2008-11-22T12:00:05Z (16 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

2eb893b

Parents:

7e6c9eb

Message:

Add implementation of fat_idx_destroy().

File:

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

uspace/srv/fs/fat/fat_idx.c

@@ -215 +215 @@
 
 /** Allocate a VFS index which is not currently in use. */
-static bool fat_idx_alloc(dev_handle_t dev_handle, fs_index_t *index)
+static bool fat_index_alloc(dev_handle_t dev_handle, fs_index_t *index)
 {
         unused_t *u;
@@ -277 +277 @@
 
 /** Free a VFS index, which is no longer in use. */
-static void fat_idx_free(dev_handle_t dev_handle, fs_index_t index)
+static void fat_index_free(dev_handle_t dev_handle, fs_index_t index)
 {
         unused_t *u;
@@ -339 +339 @@
 }
 
-static fat_idx_t *fat_idx_get_new_core(dev_handle_t dev_handle)
+static fat_idx_t *fat_idx_create(dev_handle_t dev_handle)
 {
         fat_idx_t *fidx;
@@ -346 +346 @@
         if (!fidx) 
                 return NULL;
-        if (!fat_idx_alloc(dev_handle, &fidx->index)) {
+        if (!fat_index_alloc(dev_handle, &fidx->index)) {
                 free(fidx);
                 return NULL;
@@ -367 +367 @@
 
         futex_down(&used_futex);
-        fidx = fat_idx_get_new_core(dev_handle);
+        fidx = fat_idx_create(dev_handle);
         if (!fidx) {
                 futex_up(&used_futex);
@@ -401 +401 @@
                 fidx = hash_table_get_instance(l, fat_idx_t, uph_link);
         } else {
-                fidx = fat_idx_get_new_core(dev_handle);
+                fidx = fat_idx_create(dev_handle);
                 if (!fidx) {
                         futex_up(&used_futex);
@@ -445 +445 @@
 }
 
+/** Destroy the index structure.
+ *
+ * @param idx           The index structure to be destroyed.
+ */
+void fat_idx_destroy(fat_idx_t *idx)
+{
+        unsigned long ikey[] = {
+                [UIH_DH_KEY] = idx->dev_handle,
+                [UIH_INDEX_KEY] = idx->index,
+        };
+
+        assert(idx->pfc == FAT_CLST_RES0);
+
+        futex_down(&used_futex);
+        /*
+         * Since we can only free unlinked nodes, the index structure is not
+         * present in the position hash (uph). We therefore hash it out from
+         * the index hash only.
+         */
+        hash_table_remove(&ui_hash, ikey, 2);
+        futex_up(&used_futex);
+        /* Release the VFS index. */
+        fat_index_free(idx->dev_handle, idx->index);
+        /* Deallocate the structure. */
+        free(idx);
+}
+
 int fat_idx_init(void)
 {