Changeset b3f598e in mainline

Timestamp:

2007-09-13T20:19:40Z (17 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

183b4a0

Parents:

c952465d

Message:

VFS work.
Start implementing the VFS_REGISTER request.

Location:

uspace/srv/vfs

Files:

• vfs.c (modified) (2 diffs)
• vfs.h (modified) (1 diff)

uspace/srv/vfs/vfs.c

@@ -42 +42 @@
 #include "vfs.h"
 
+static void vfs_register(ipc_callid_t iid, ipc_call_t *icall)
+{
+        ipc_callid_t callid;
+        ipc_call_t call;
+
+        callid = async_get_call(&call);
+        if (IPC_GET_METHOD(call) == IPC_M_DATA_SEND) {
+                size_t size = IPC_GET_ARG3(call);
+                if (size != sizeof(vfs_info_t)) {
+                        /*
+                         * The client is sending us something, which cannot be
+                         * the info structure.
+                         */
+                        ipc_answer_fast(iid, EINVAL, 0, 0);
+                        ipc_answer_fast(callid, EINVAL, 0, 0);
+                        return;
+                }
+                /*
+                 * XXX: continue here
+                 * Allocate an info structue, answer the call, check sanity
+                 * of the copied-in info structure, ...
+                 */
+        } else {
+                /*
+                 * The client doesn't obey the same protocol as we do.
+                 */ 
+                ipc_answer_fast(iid, EINVAL, 0, 0);
+                ipc_answer_fast(callid, EINVAL, 0, 0);
+                return;
+        }
+}
+
 static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall)
 {
@@ -65 +97 @@
         switch (iarg1) {
         case VFS_REGISTER:
+                vfs_register(iid, icall);
+                break;
         case VFS_MOUNT:
         case VFS_UNMOUNT:

uspace/srv/vfs/vfs.h

@@ -35 +35 @@
 
 typedef enum {
-        VFS_REGISTER = 1,
+        VFS_REGISTER = 0,
         VFS_MOUNT,
         VFS_UNMOUNT,
-        VFS_OPEN
+        VFS_OPEN,
+        VFS_LAST,               /* keep this the last member of the enum */
 } vfs_request_t;
+
+
+/**
+ * An instance of this structure is associated with a particular FS operation.
+ * It tells VFS if the FS supports the operation or maybe if a default one
+ * should be used.
+ */
+typedef enum {
+        VFS_OP_NOTSUP = 0,
+        VFS_OP_DEFAULT,
+        VFS_OP_DEFINED
+} vfs_op_t;
+
+#define FS_NAME_MAXLEN  20
+
+/**
+ * A structure like this is passed to VFS by each individual FS upon its
+ * registration. It assosiates a human-readable identifier with each
+ * registered FS. More importantly, through this structure, the FS announces
+ * what operations it supports.
+ */
+typedef struct {
+        char fs_name[FS_NAME_MAXLEN];   /**< Unique identifier of the fs. */
+        vfs_op_t ops[VFS_LAST];         /**< Operations. */
+} vfs_info_t;
 
 #endif