WebSVN – HelenOS – Diff – /branches/dd/uspace/srv/vfs/vfs_ops.c

 /** Pending mount structure. */
 typedef struct {
     link_t link;
     char *fs_name;            /**< File system name */
     char *mp;                 /**< Mount point */
+    char *opts;       /**< Mount options. */
     ipc_callid_t callid;      /**< Call ID waiting for the mount */
     ipc_callid_t rid;         /**< Request ID */
     dev_handle_t dev_handle;  /**< Device handle */
 } pending_req_t;
     .fs_handle = 0,
     .dev_handle = 0
 };
 static void vfs_mount_internal(ipc_callid_t rid, dev_handle_t dev_handle,
-    fs_handle_t fs_handle, char *mp)
+    fs_handle_t fs_handle, char *mp, char *opts)
+{
-    /* Resolve the path to the mountpoint. */
     vfs_lookup_res_t mp_res;
+    vfs_lookup_res_t mr_res;
     vfs_node_t *mp_node = NULL;
+    vfs_node_t *mr_node;
+    fs_index_t rindex;
+    size_t rsize;
+    unsigned rlnkcnt;
-    int rc;
+    ipcarg_t rc;
     int phone;
+    aid_t msg;
+    ipc_call_t answer;
+    /* Resolve the path to the mountpoint. */
     futex_down(&rootfs_futex);
     if (rootfs.fs_handle) {
         /* We already have the root FS. */
         rwlock_write_lock(&namespace_rwlock);
         if (str_cmp(mp, "/") == 0) {
          */
         rwlock_write_unlock(&namespace_rwlock);
     } else {
         /* We still don't have the root file system mounted. */
         if (str_cmp(mp, "/") == 0) {
-            vfs_lookup_res_t mr_res;
-            vfs_node_t *mr_node;
-            ipcarg_t rindex;
-            ipcarg_t rsize;
-            ipcarg_t rlnkcnt;
             /*
              * For this simple, but important case,
              * we are almost done.
              */
             /* Tell the mountee that it is being mounted. */
             phone = vfs_grab_phone(fs_handle);
-            rc = async_req_1_3(phone, VFS_MOUNTED,
+            msg = async_send_1(phone, VFS_MOUNTED,
-                (ipcarg_t) dev_handle, &rindex, &rsize, &rlnkcnt);
+                (ipcarg_t) dev_handle, &answer);
+            /* send the mount options */
+            rc = ipc_data_write_start(phone, (void *)opts,
+                str_size(opts));
+            if (rc != EOK) {
+                async_wait_for(msg, NULL);
+                vfs_release_phone(phone);
+                futex_up(&rootfs_futex);
+                ipc_answer_0(rid, rc);
+                return;
+            }
+            async_wait_for(msg, &rc);
             vfs_release_phone(phone);
             if (rc != EOK) {
                 futex_up(&rootfs_futex);
                 ipc_answer_0(rid, rc);
                 return;
+            }
+            rindex = (fs_index_t) IPC_GET_ARG1(answer);
+            rsize = (size_t) IPC_GET_ARG2(answer);
+            rlnkcnt = (unsigned) IPC_GET_ARG3(answer);
             mr_res.triplet.fs_handle = fs_handle;
             mr_res.triplet.dev_handle = dev_handle;
-            mr_res.triplet.index = (fs_index_t) rindex;
+            mr_res.triplet.index = rindex;
-            mr_res.size = (size_t) rsize;
+            mr_res.size = rsize;
-            mr_res.lnkcnt = (unsigned) rlnkcnt;
+            mr_res.lnkcnt = rlnkcnt;
             mr_res.type = VFS_NODE_DIRECTORY;
             rootfs.fs_handle = fs_handle;
             rootfs.dev_handle = dev_handle;
             futex_up(&rootfs_futex);
     /*
      * At this point, we have all necessary pieces: file system and device
      * handles, and we know the mount point VFS node.
      */
+    int mountee_phone = vfs_grab_phone(fs_handle);
+    assert(mountee_phone >= 0);
+    vfs_release_phone(mountee_phone);
     phone = vfs_grab_phone(mp_res.triplet.fs_handle);
-    rc = async_req_4_0(phone, VFS_MOUNT,
+    msg = async_send_4(phone, VFS_MOUNT,
         (ipcarg_t) mp_res.triplet.dev_handle,
         (ipcarg_t) mp_res.triplet.index,
         (ipcarg_t) fs_handle,
-        (ipcarg_t) dev_handle);
+        (ipcarg_t) dev_handle, &answer);
+    /* send connection */
+    rc = async_req_1_0(phone, IPC_M_CONNECTION_CLONE, mountee_phone);
+    if (rc != EOK) {
+        async_wait_for(msg, NULL);
+        vfs_release_phone(phone);
+        /* Mount failed, drop reference to mp_node. */
+        if (mp_node)
+            vfs_node_put(mp_node);
+        ipc_answer_0(rid, rc);
+        return;
+    }
+    /* send the mount options */
+    rc = ipc_data_write_start(phone, (void *)opts, str_size(opts));
+    if (rc != EOK) {
+        async_wait_for(msg, NULL);
+        vfs_release_phone(phone);
+        /* Mount failed, drop reference to mp_node. */
+        if (mp_node)
+            vfs_node_put(mp_node);
+        ipc_answer_0(rid, rc);
+        return;
+    }
+    async_wait_for(msg, &rc);
     vfs_release_phone(phone);
     if (rc != EOK) {
         /* Mount failed, drop reference to mp_node. */
         if (mp_node)
             vfs_node_put(mp_node);
+    }
+    rindex = (fs_index_t) IPC_GET_ARG1(answer);
+    rsize = (size_t) IPC_GET_ARG2(answer);
+    rlnkcnt = (unsigned) IPC_GET_ARG3(answer);
+    mr_res.triplet.fs_handle = fs_handle;
+    mr_res.triplet.dev_handle = dev_handle;
+    mr_res.triplet.index = rindex;
+    mr_res.size = rsize;
+    mr_res.lnkcnt = rlnkcnt;
+    mr_res.type = VFS_NODE_DIRECTORY;
+    /* Add reference to the mounted root. */
+    mr_node = vfs_node_get(&mr_res);
+    assert(mr_node);
     ipc_answer_0(rid, rc);
+}
 /** Process pending mount requests */
 void vfs_process_pending_mount()
         /* Acknowledge that we know fs_name. */
         ipc_answer_0(pr->callid, EOK);
         /* Do the mount */
-        vfs_mount_internal(pr->rid, pr->dev_handle, fs_handle, pr->mp);
+        vfs_mount_internal(pr->rid, pr->dev_handle, fs_handle, pr->mp,
+            pr->opts);
         free(pr->fs_name);
         free(pr->mp);
+        free(pr->opts);
         list_remove(cur);
         free(pr);
         goto loop;
+    }
+}
+    }
     /* Deliver the mount point. */
     ipcarg_t retval = ipc_data_write_finalize(callid, mp, size);
     if (retval != EOK) {
-        ipc_answer_0(rid, EREFUSED);
+        ipc_answer_0(rid, retval);
         free(mp);
         return;
+    }
     mp[size] = '\0';
+    /* Now we expect to receive the mount options. */
+    if (!ipc_data_write_receive(&callid, &size)) {
+        ipc_answer_0(callid, EINVAL);
+        ipc_answer_0(rid, EINVAL);
+        free(mp);
+        return;
+    }
+    /* Check the offered options size. */
+    if (size < 0 || size > MAX_MNTOPTS_LEN) {
+        ipc_answer_0(callid, EINVAL);
+        ipc_answer_0(rid, EINVAL);
+        free(mp);
+        return;
+    }
+    /* Allocate buffer for the mount options. */
+    char *opts = (char *) malloc(size + 1);
+    if (!opts) {
+        ipc_answer_0(callid, ENOMEM);
+        ipc_answer_0(rid, ENOMEM);
+        free(mp);
+        return;
+    }
+    /* Deliver the mount options. */
+    retval = ipc_data_write_finalize(callid, opts, size);
+    if (retval != EOK) {
+        ipc_answer_0(rid, retval);
+        free(mp);
+        free(opts);
+        return;
+    }
+    opts[size] = '\0';
     /*
      * Now, we expect the client to send us data with the name of the file
      * system.
      */
     if (!ipc_data_write_receive(&callid, &size)) {
         ipc_answer_0(callid, EINVAL);
         ipc_answer_0(rid, EINVAL);
         free(mp);
+        free(opts);
         return;
+    }
     /*
      * Don't receive more than is necessary for storing a full file system
      */
     if ((size < 1) || (size > FS_NAME_MAXLEN)) {
         ipc_answer_0(callid, EINVAL);
         ipc_answer_0(rid, EINVAL);
         free(mp);
+        free(opts);
         return;
+    }
     /*
      * Allocate buffer for file system name.
      */
     char *fs_name = (char *) malloc(size + 1);
     if (fs_name == NULL) {
         ipc_answer_0(callid, ENOMEM);
-        ipc_answer_0(rid, EREFUSED);
+        ipc_answer_0(rid, ENOMEM);
         free(mp);
+        free(opts);
         return;
+    }
     /* Deliver the file system name. */
     retval = ipc_data_write_finalize(callid, fs_name, size);
     if (retval != EOK) {
-        ipc_answer_0(rid, EREFUSED);
+        ipc_answer_0(rid, retval);
         free(mp);
+        free(opts);
         free(fs_name);
         return;
+    }
     fs_name[size] = '\0';
+    /*
+     * Wait for IPC_M_PING so that we can return an error if we don't know
+     * fs_name.
+     */
+    ipc_call_t data;
+    callid = async_get_call(&data);
+    if (IPC_GET_METHOD(data) != IPC_M_PING) {
+        ipc_answer_0(callid, ENOTSUP);
+        ipc_answer_0(rid, ENOTSUP);
+        free(mp);
+        free(opts);
+        free(fs_name);
+        return;
+    }
     /*
      * Check if we know a file system with the same name as is in fs_name.
      * This will also give us its file system handle.
      */
     fs_handle_t fs_handle = fs_name_to_handle(fs_name, true);
     if (!fs_handle) {
         if (flags & IPC_FLAG_BLOCKING) {
+            pending_req_t *pr;
             /* Blocking mount, add to pending list */
-            pending_req_t *pr = (pending_req_t *) malloc(sizeof(pending_req_t));
+            pr = (pending_req_t *) malloc(sizeof(pending_req_t));
             if (!pr) {
                 ipc_answer_0(callid, ENOMEM);
                 ipc_answer_0(rid, ENOMEM);
                 free(mp);
                 free(fs_name);
+                free(opts);
                 return;
+            }
             pr->fs_name = fs_name;
             pr->mp = mp;
+            pr->opts = opts;
             pr->callid = callid;
             pr->rid = rid;
             pr->dev_handle = dev_handle;
             link_initialize(&pr->link);
             list_append(&pr->link, &pending_req);
         ipc_answer_0(callid, ENOENT);
         ipc_answer_0(rid, ENOENT);
         free(mp);
         free(fs_name);
+        free(opts);
         return;
+    }
     /* Acknowledge that we know fs_name. */
     ipc_answer_0(callid, EOK);
     /* Do the mount */
-    vfs_mount_internal(rid, dev_handle, fs_handle, mp);
+    vfs_mount_internal(rid, dev_handle, fs_handle, mp, opts);
     free(mp);
     free(fs_name);
+    free(opts);
+}
 void vfs_open(ipc_callid_t rid, ipc_call_t *request)
+{
     if (!vfs_files_init()) {
         free(new);
         return;
+    }
     oldc[olen] = '\0';
     newc[nlen] = '\0';
-    if (!str_lcmp(newc, oldc, str_length(oldc))) {
+    if ((!str_lcmp(newc, oldc, str_length(oldc))) &&
+        ((newc[str_length(oldc)] == '/') ||
+        (str_length(oldc) == 1) ||
+        (str_length(oldc) == str_length(newc)))) {
+            /*
-        /* oldc is a prefix of newc */
+         * oldc is a prefix of newc and either
+         * - newc continues with a / where oldc ends, or
+         * - oldc was / itself, or
+         * - oldc and newc are equal.
+         */
         ipc_answer_0(rid, EINVAL);
         free(old);
         free(new);
         return;
+    }
         ipc_answer_0(rid, ENOMEM);
         free(old);
         free(new);
         return;
+    }
+    /* Determine the path to the parent of the node with the new name. */
+    char *parentc = str_dup(newc);
+    if (!parentc) {
+        rwlock_write_unlock(&namespace_rwlock);
+        ipc_answer_0(rid, rc);
+        free(old);
+        free(new);
+        return;
+    }
+    char *lastsl = str_rchr(parentc + 1, L'/');
+    if (lastsl)
+        *lastsl = '\0';
+    else
+        parentc[1] = '\0';
     /* Lookup parent of the new file name. */
-    rc = vfs_lookup_internal(newc, L_PARENT, &new_par_lr, NULL);
+    rc = vfs_lookup_internal(parentc, L_NONE, &new_par_lr, NULL);
+    free(parentc);  /* not needed anymore */
     if (rc != EOK) {
         rwlock_write_unlock(&namespace_rwlock);
         ipc_answer_0(rid, rc);
         free(old);
         free(new);

Subversion Repositories HelenOS

(root)/branches/dd/uspace/srv/vfs/vfs_ops.c – Rev 4419 → 4420