Changeset 8c20b26 in mainline

Timestamp:

2007-09-26T22:05:22Z (17 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

5d4e90f0

Parents:

01f5e17

Message:

VFS work.
Introduce basic types representing a file system node and an open file.

File:

• uspace/srv/vfs/vfs.h (modified) (4 diffs)

uspace/srv/vfs/vfs.h

@@ -36 +36 @@
 #include <ipc/ipc.h>
 #include <libadt/list.h>
+#include <atomic.h>
+#include <types.h>
 
 #define dprintf(...)    printf(__VA_ARGS__)
@@ -42 +44 @@
 
 #define IPC_METHOD_TO_VFS_OP(m) ((m) - VFS_FIRST)       
+
+typedef int64_t off_t;
 
 typedef enum {
@@ -85 +89 @@
 } vfs_info_t;
 
+/**
+ * A structure like this will be allocated for each registered file system.
+ */
 typedef struct {
         link_t fs_link;
@@ -90 +97 @@
         ipcarg_t phone;
 } fs_info_t;
+
+/**
+ * Instances of this type represent a file system node (e.g. directory, file).
+ * They are abstracted away from any file system implementation and contain just
+ * enough bits to uniquely identify the object in its file system instance.
+ *
+ * @note        fs_handle, dev_handle and index are meant to be returned in one
+ *              IPC reply.
+ */
+typedef struct {
+        int fs_handle;          /**< Global file system ID. */
+        int dev_handle;         /**< Global mount device devno. */
+        uint64_t index;         /**< Index of the node on its file system. */
+} vfs_node_t;
+
+/**
+ * Instances of this type represent an open file. If the file is opened by more
+ * than one task, there will be a separate structure allocated for each task.
+ */
+typedef struct {
+        vfs_node_t *node;
+        
+        /** Number of file handles referencing this file. */
+        atomic_t refcnt;
+
+        /** Current position in the file. */
+        off_t pos;
+} vfs_file_t;
 
 extern link_t fs_head;