Changes in uspace/srv/fs/devfs/devfs_ops.c [0da4e41:1313ee9] in mainline

File:

• uspace/srv/fs/devfs/devfs_ops.c (modified) (11 diffs)

uspace/srv/fs/devfs/devfs_ops.c

@@ -42 +42 @@
 #include <string.h>
 #include <libfs.h>
-#include <fibril_sync.h>
+#include <fibril_synch.h>
 #include <adt/hash_table.h>
+#include <ipc/devmap.h>
 #include <sys/stat.h>
+#include <libfs.h>
+#include <assert.h>
 #include "devfs.h"
 #include "devfs_ops.h"
 
-#define PLB_GET_CHAR(pos)  (devfs_reg.plb_ro[pos % PLB_SIZE])
+typedef struct {
+        devmap_handle_type_t type;
+        dev_handle_t handle;
+} devfs_node_t;
 
 /** Opened devices structure */
@@ -91 +97 @@
 };
 
+static int devfs_node_get_internal(fs_node_t **rfn, devmap_handle_type_t type,
+    dev_handle_t handle)
+{
+        devfs_node_t *node = (devfs_node_t *) malloc(sizeof(devfs_node_t));
+        if (node == NULL) {
+                *rfn = NULL;
+                return ENOMEM;
+        }
+        
+        *rfn = (fs_node_t *) malloc(sizeof(fs_node_t));
+        if (*rfn == NULL) {
+                free(node);
+                *rfn = NULL;
+                return ENOMEM;
+        }
+        
+        fs_node_initialize(*rfn);
+        node->type = type;
+        node->handle = handle;
+        
+        (*rfn)->data = node;
+        return EOK;
+}
+
+static int devfs_root_get(fs_node_t **rfn, dev_handle_t dev_handle)
+{
+        return devfs_node_get_internal(rfn, DEV_HANDLE_NONE, 0);
+}
+
+static int devfs_match(fs_node_t **rfn, fs_node_t *pfn, const char *component)
+{
+        devfs_node_t *node = (devfs_node_t *) pfn->data;
+        
+        if (node->handle == 0) {
+                /* Root directory */
+                
+                dev_desc_t *devs;
+                size_t count = devmap_get_namespaces(&devs);
+                
+                if (count > 0) {
+                        size_t pos;
+                        for (pos = 0; pos < count; pos++) {
+                                /* Ignore root namespace */
+                                if (str_cmp(devs[pos].name, "") == 0)
+                                        continue;
+                                
+                                if (str_cmp(devs[pos].name, component) == 0) {
+                                        free(devs);
+                                        return devfs_node_get_internal(rfn, DEV_HANDLE_NAMESPACE, devs[pos].handle);
+                                }
+                        }
+                        
+                        free(devs);
+                }
+                
+                /* Search root namespace */
+                dev_handle_t namespace;
+                if (devmap_namespace_get_handle("", &namespace, 0) == EOK) {
+                        count = devmap_get_devices(namespace, &devs);
+                        
+                        if (count > 0) {
+                                size_t pos;
+                                for (pos = 0; pos < count; pos++) {
+                                        if (str_cmp(devs[pos].name, component) == 0) {
+                                                free(devs);
+                                                return devfs_node_get_internal(rfn, DEV_HANDLE_DEVICE, devs[pos].handle);
+                                        }
+                                }
+                                
+                                free(devs);
+                        }
+                }
+                
+                *rfn = NULL;
+                return EOK;
+        }
+        
+        if (node->type == DEV_HANDLE_NAMESPACE) {
+                /* Namespace directory */
+                
+                dev_desc_t *devs;
+                size_t count = devmap_get_devices(node->handle, &devs);
+                if (count > 0) {
+                        size_t pos;
+                        for (pos = 0; pos < count; pos++) {
+                                if (str_cmp(devs[pos].name, component) == 0) {
+                                        free(devs);
+                                        return devfs_node_get_internal(rfn, DEV_HANDLE_DEVICE, devs[pos].handle);
+                                }
+                        }
+                        
+                        free(devs);
+                }
+                
+                *rfn = NULL;
+                return EOK;
+        }
+        
+        *rfn = NULL;
+        return EOK;
+}
+
+static int devfs_node_get(fs_node_t **rfn, dev_handle_t dev_handle, fs_index_t index)
+{
+        return devfs_node_get_internal(rfn, devmap_handle_probe(index), index);
+}
+
+static int devfs_node_open(fs_node_t *fn)
+{
+        devfs_node_t *node = (devfs_node_t *) fn->data;
+        
+        if (node->handle == 0) {
+                /* Root directory */
+                return EOK;
+        }
+        
+        devmap_handle_type_t type = devmap_handle_probe(node->handle);
+        
+        if (type == DEV_HANDLE_NAMESPACE) {
+                /* Namespace directory */
+                return EOK;
+        }
+        
+        if (type == DEV_HANDLE_DEVICE) {
+                /* Device node */
+                
+                unsigned long key[] = {
+                        [DEVICES_KEY_HANDLE] = (unsigned long) node->handle
+                };
+                
+                fibril_mutex_lock(&devices_mutex);
+                link_t *lnk = hash_table_find(&devices, key);
+                if (lnk == NULL) {
+                        device_t *dev = (device_t *) malloc(sizeof(device_t));
+                        if (dev == NULL) {
+                                fibril_mutex_unlock(&devices_mutex);
+                                return ENOMEM;
+                        }
+                        
+                        int phone = devmap_device_connect(node->handle, 0);
+                        if (phone < 0) {
+                                fibril_mutex_unlock(&devices_mutex);
+                                free(dev);
+                                return ENOENT;
+                        }
+                        
+                        dev->handle = node->handle;
+                        dev->phone = phone;
+                        dev->refcount = 1;
+                        
+                        hash_table_insert(&devices, key, &dev->link);
+                } else {
+                        device_t *dev = hash_table_get_instance(lnk, device_t, link);
+                        dev->refcount++;
+                }
+                
+                fibril_mutex_unlock(&devices_mutex);
+                
+                return EOK;
+        }
+        
+        return ENOENT;
+}
+
+static int devfs_node_put(fs_node_t *fn)
+{
+        free(fn->data);
+        free(fn);
+        return EOK;
+}
+
+static int devfs_create_node(fs_node_t **rfn, dev_handle_t dev_handle, int lflag)
+{
+        assert((lflag & L_FILE) ^ (lflag & L_DIRECTORY));
+        
+        *rfn = NULL;
+        return ENOTSUP;
+}
+
+static int devfs_destroy_node(fs_node_t *fn)
+{
+        return ENOTSUP;
+}
+
+static int devfs_link_node(fs_node_t *pfn, fs_node_t *cfn, const char *nm)
+{
+        return ENOTSUP;
+}
+
+static int devfs_unlink_node(fs_node_t *pfn, fs_node_t *cfn, const char *nm)
+{
+        return ENOTSUP;
+}
+
+static int devfs_has_children(bool *has_children, fs_node_t *fn)
+{
+        devfs_node_t *node = (devfs_node_t *) fn->data;
+        
+        if (node->handle == 0) {
+                size_t count = devmap_count_namespaces();
+                if (count > 0) {
+                        *has_children = true;
+                        return EOK;
+                }
+                
+                /* Root namespace */
+                dev_handle_t namespace;
+                if (devmap_namespace_get_handle("", &namespace, 0) == EOK) {
+                        count = devmap_count_devices(namespace);
+                        if (count > 0) {
+                                *has_children = true;
+                                return EOK;
+                        }
+                }
+                
+                *has_children = false;
+                return EOK;
+        }
+        
+        if (node->type == DEV_HANDLE_NAMESPACE) {
+                size_t count = devmap_count_devices(node->handle);
+                if (count > 0) {
+                        *has_children = true;
+                        return EOK;
+                }
+                
+                *has_children = false;
+                return EOK;
+        }
+        
+        *has_children = false;
+        return EOK;
+}
+
+static fs_index_t devfs_index_get(fs_node_t *fn)
+{
+        devfs_node_t *node = (devfs_node_t *) fn->data;
+        return node->handle;
+}
+
+static size_t devfs_size_get(fs_node_t *fn)
+{
+        return 0;
+}
+
+static unsigned int devfs_lnkcnt_get(fs_node_t *fn)
+{
+        devfs_node_t *node = (devfs_node_t *) fn->data;
+        
+        if (node->handle == 0)
+                return 0;
+        
+        return 1;
+}
+
+static char devfs_plb_get_char(unsigned pos)
+{
+        return devfs_reg.plb_ro[pos % PLB_SIZE];
+}
+
+static bool devfs_is_directory(fs_node_t *fn)
+{
+        devfs_node_t *node = (devfs_node_t *) fn->data;
+        
+        return ((node->type == DEV_HANDLE_NONE) || (node->type == DEV_HANDLE_NAMESPACE));
+}
+
+static bool devfs_is_file(fs_node_t *fn)
+{
+        devfs_node_t *node = (devfs_node_t *) fn->data;
+        
+        return (node->type == DEV_HANDLE_DEVICE);
+}
+
+static dev_handle_t devfs_device_get(fs_node_t *fn)
+{
+        devfs_node_t *node = (devfs_node_t *) fn->data;
+        
+        if (node->type == DEV_HANDLE_DEVICE)
+                return node->handle;
+        
+        return 0;
+}
+
+/** libfs operations */
+libfs_ops_t devfs_libfs_ops = {
+        .root_get = devfs_root_get,
+        .match = devfs_match,
+        .node_get = devfs_node_get,
+        .node_open = devfs_node_open,
+        .node_put = devfs_node_put,
+        .create = devfs_create_node,
+        .destroy = devfs_destroy_node,
+        .link = devfs_link_node,
+        .unlink = devfs_unlink_node,
+        .has_children = devfs_has_children,
+        .index_get = devfs_index_get,
+        .size_get = devfs_size_get,
+        .lnkcnt_get = devfs_lnkcnt_get,
+        .plb_get_char = devfs_plb_get_char,
+        .is_directory = devfs_is_directory,
+        .is_file = devfs_is_file,
+        .device_get = devfs_device_get
+};
+
 bool devfs_init(void)
 {
@@ -105 +416 @@
 void devfs_mounted(ipc_callid_t rid, ipc_call_t *request)
 {
+        char *opts;
+        
         /* Accept the mount options */
-        ipc_callid_t callid;
-        size_t size;
-        if (!async_data_write_receive(&callid, &size)) {
-                ipc_answer_0(callid, EINVAL);
-                ipc_answer_0(rid, EINVAL);
-                return;
-        }
-        
-        char *opts = malloc(size + 1);
-        if (!opts) {
-                ipc_answer_0(callid, ENOMEM);
-                ipc_answer_0(rid, ENOMEM);
-                return;
-        }
-        
-        ipcarg_t retval = async_data_write_finalize(callid, opts, size);
+        ipcarg_t retval = async_data_string_receive(&opts, 0);
         if (retval != EOK) {
                 ipc_answer_0(rid, retval);
-                free(opts);
                 return;
         }
         
         free(opts);
-        
         ipc_answer_3(rid, EOK, 0, 0, 0);
 }
@@ -135 +431 @@
 void devfs_mount(ipc_callid_t rid, ipc_call_t *request)
 {
-        ipc_answer_0(rid, ENOTSUP);
+        libfs_mount(&devfs_libfs_ops, devfs_reg.fs_handle, rid, request);
 }
 
 void devfs_lookup(ipc_callid_t rid, ipc_call_t *request)
 {
-        ipcarg_t first = IPC_GET_ARG1(*request);
-        ipcarg_t last = IPC_GET_ARG2(*request);
-        dev_handle_t dev_handle = IPC_GET_ARG3(*request);
-        ipcarg_t lflag = IPC_GET_ARG4(*request);
-        fs_index_t index = IPC_GET_ARG5(*request);
-        
-        /* Hierarchy is flat, no altroot is supported */
-        if (index != 0) {
-                ipc_answer_0(rid, ENOENT);
-                return;
-        }
-        
-        if ((lflag & L_LINK) || (lflag & L_UNLINK)) {
-                ipc_answer_0(rid, ENOTSUP);
-                return;
-        }
-        
-        /* Eat slash */
-        if (PLB_GET_CHAR(first) == '/') {
-                first++;
-                first %= PLB_SIZE;
-        }
-        
-        if (first >= last) {
-                /* Root entry */
-                if (!(lflag & L_FILE))
-                        ipc_answer_5(rid, EOK, devfs_reg.fs_handle, dev_handle, 0, 0, 0);
-                else
-                        ipc_answer_0(rid, ENOENT);
-        } else {
-                if (!(lflag & L_DIRECTORY)) {
-                        size_t len;
-                        if (last >= first)
-                                len = last - first + 1;
-                        else
-                                len = first + PLB_SIZE - last + 1;
+        libfs_lookup(&devfs_libfs_ops, devfs_reg.fs_handle, rid, request);
+}
+
+void devfs_open_node(ipc_callid_t rid, ipc_call_t *request)
+{
+        libfs_open_node(&devfs_libfs_ops, devfs_reg.fs_handle, rid, request);
+}
+
+void devfs_stat(ipc_callid_t rid, ipc_call_t *request)
+{
+        libfs_stat(&devfs_libfs_ops, devfs_reg.fs_handle, rid, request);
+}
+
+void devfs_read(ipc_callid_t rid, ipc_call_t *request)
+{
+        fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request);
+        off_t pos = (off_t) IPC_GET_ARG3(*request);
+        
+        if (index == 0) {
+                ipc_callid_t callid;
+                size_t size;
+                if (!async_data_read_receive(&callid, &size)) {
+                        ipc_answer_0(callid, EINVAL);
+                        ipc_answer_0(rid, EINVAL);
+                        return;
+                }
+                
+                dev_desc_t *desc;
+                size_t count = devmap_get_namespaces(&desc);
+                
+                /* Get rid of root namespace */
+                size_t i;
+                for (i = 0; i < count; i++) {
+                        if (str_cmp(desc[i].name, "") == 0) {
+                                if (pos >= i)
+                                        pos++;
+                                
+                                break;
+                        }
+                }
+                
+                if (pos < count) {
+                        async_data_read_finalize(callid, desc[pos].name, str_size(desc[pos].name) + 1);
+                        free(desc);
+                        ipc_answer_1(rid, EOK, 1);
+                        return;
+                }
+                
+                free(desc);
+                pos -= count;
+                
+                /* Search root namespace */
+                dev_handle_t namespace;
+                if (devmap_namespace_get_handle("", &namespace, 0) == EOK) {
+                        count = devmap_get_devices(namespace, &desc);
                         
-                        char *name = (char *) malloc(len + 1);
-                        if (name == NULL) {
-                                ipc_answer_0(rid, ENOMEM);
+                        if (pos < count) {
+                                async_data_read_finalize(callid, desc[pos].name, str_size(desc[pos].name) + 1);
+                                free(desc);
+                                ipc_answer_1(rid, EOK, 1);
                                 return;
                         }
                         
-                        size_t i;
-                        for (i = 0; i < len; i++)
-                                name[i] = PLB_GET_CHAR(first + i);
-                        
-                        name[len] = 0;
-                        
-                        dev_handle_t handle;
-                        if (devmap_device_get_handle(name, &handle, 0) != EOK) {
-                                free(name);
-                                ipc_answer_0(rid, ENOENT);
-                                return;
-                        }
-                        
-                        if (lflag & L_OPEN) {
-                                unsigned long key[] = {
-                                        [DEVICES_KEY_HANDLE] = (unsigned long) handle
-                                };
-                                
-                                fibril_mutex_lock(&devices_mutex);
-                                link_t *lnk = hash_table_find(&devices, key);
-                                if (lnk == NULL) {
-                                        int phone = devmap_device_connect(handle, 0);
-                                        if (phone < 0) {
-                                                fibril_mutex_unlock(&devices_mutex);
-                                                free(name);
-                                                ipc_answer_0(rid, ENOENT);
-                                                return;
-                                        }
-                                        
-                                        device_t *dev = (device_t *) malloc(sizeof(device_t));
-                                        if (dev == NULL) {
-                                                fibril_mutex_unlock(&devices_mutex);
-                                                free(name);
-                                                ipc_answer_0(rid, ENOMEM);
-                                                return;
-                                        }
-                                        
-                                        dev->handle = handle;
-                                        dev->phone = phone;
-                                        dev->refcount = 1;
-                                        
-                                        hash_table_insert(&devices, key, &dev->link);
-                                } else {
-                                        device_t *dev = hash_table_get_instance(lnk, device_t, link);
-                                        dev->refcount++;
-                                }
-                                fibril_mutex_unlock(&devices_mutex);
-                        }
-                        
-                        free(name);
-                        
-                        ipc_answer_5(rid, EOK, devfs_reg.fs_handle, dev_handle, handle, 0, 1);
-                } else
-                        ipc_answer_0(rid, ENOENT);
-        }
-}
-
-void devfs_open_node(ipc_callid_t rid, ipc_call_t *request)
-{
-        dev_handle_t handle = IPC_GET_ARG2(*request);
-        
-        unsigned long key[] = {
-                [DEVICES_KEY_HANDLE] = (unsigned long) handle
-        };
-        
-        fibril_mutex_lock(&devices_mutex);
-        link_t *lnk = hash_table_find(&devices, key);
-        if (lnk == NULL) {
-                int phone = devmap_device_connect(handle, 0);
-                if (phone < 0) {
-                        fibril_mutex_unlock(&devices_mutex);
-                        ipc_answer_0(rid, ENOENT);
-                        return;
-                }
-                
-                device_t *dev = (device_t *) malloc(sizeof(device_t));
-                if (dev == NULL) {
-                        fibril_mutex_unlock(&devices_mutex);
-                        ipc_answer_0(rid, ENOMEM);
-                        return;
-                }
-                
-                dev->handle = handle;
-                dev->phone = phone;
-                dev->refcount = 1;
-                
-                hash_table_insert(&devices, key, &dev->link);
-        } else {
-                device_t *dev = hash_table_get_instance(lnk, device_t, link);
-                dev->refcount++;
-        }
-        fibril_mutex_unlock(&devices_mutex);
-        
-        ipc_answer_3(rid, EOK, 0, 1, L_FILE);
-}
-
-void devfs_stat(ipc_callid_t rid, ipc_call_t *request)
-{
-        dev_handle_t dev_handle = (dev_handle_t) IPC_GET_ARG1(*request);
-        fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request);
-        
-        ipc_callid_t callid;
-        size_t size;
-        if (!async_data_read_receive(&callid, &size) ||
-            size != sizeof(struct stat)) {
-                ipc_answer_0(callid, EINVAL);
-                ipc_answer_0(rid, EINVAL);
-                return;
-        }
-
-        struct stat stat;
-        memset(&stat, 0, sizeof(struct stat));
-
-        stat.fs_handle = devfs_reg.fs_handle;
-        stat.dev_handle = dev_handle;
-        stat.index = index;
-        stat.lnkcnt = 1;
-        stat.is_file = (index != 0);
-        stat.size = 0;
-        
-        if (index != 0) {
-                unsigned long key[] = {
-                        [DEVICES_KEY_HANDLE] = (unsigned long) index
-                };
-                
-                fibril_mutex_lock(&devices_mutex);
-                link_t *lnk = hash_table_find(&devices, key);
-                if (lnk != NULL) 
-                        stat.devfs_stat.device = (dev_handle_t)index;
-                fibril_mutex_unlock(&devices_mutex);
-        }
-
-        async_data_read_finalize(callid, &stat, sizeof(struct stat));
-        ipc_answer_0(rid, EOK);
-}
-
-void devfs_read(ipc_callid_t rid, ipc_call_t *request)
-{
-        fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request);
-        off_t pos = (off_t) IPC_GET_ARG3(*request);
-        
-        if (index != 0) {
+                        free(desc);
+                }
+                
+                ipc_answer_0(callid, ENOENT);
+                ipc_answer_1(rid, ENOENT, 0);
+                return;
+        }
+        
+        devmap_handle_type_t type = devmap_handle_probe(index);
+        
+        if (type == DEV_HANDLE_NAMESPACE) {
+                /* Namespace directory */
+                ipc_callid_t callid;
+                size_t size;
+                if (!async_data_read_receive(&callid, &size)) {
+                        ipc_answer_0(callid, EINVAL);
+                        ipc_answer_0(rid, EINVAL);
+                        return;
+                }
+                
+                dev_desc_t *desc;
+                size_t count = devmap_get_devices(index, &desc);
+                
+                if (pos < count) {
+                        async_data_read_finalize(callid, desc[pos].name, str_size(desc[pos].name) + 1);
+                        free(desc);
+                        ipc_answer_1(rid, EOK, 1);
+                        return;
+                }
+                
+                free(desc);
+                ipc_answer_0(callid, ENOENT);
+                ipc_answer_1(rid, ENOENT, 0);
+                return;
+        }
+        
+        if (type == DEV_HANDLE_DEVICE) {
+                /* Device node */
+                
                 unsigned long key[] = {
                         [DEVICES_KEY_HANDLE] = (unsigned long) index
@@ -364 +577 @@
                 /* Driver reply is the final result of the whole operation */
                 ipc_answer_1(rid, rc, bytes);
-        } else {
-                ipc_callid_t callid;
-                size_t size;
-                if (!async_data_read_receive(&callid, &size)) {
-                        ipc_answer_0(callid, EINVAL);
-                        ipc_answer_0(rid, EINVAL);
-                        return;
-                }
-                
-                size_t count = devmap_device_get_count();
-                dev_desc_t *desc = malloc(count * sizeof(dev_desc_t));
-                if (desc == NULL) {
-                        ipc_answer_0(callid, ENOMEM);
-                        ipc_answer_1(rid, ENOMEM, 0);
-                        return;
-                }
-                
-                size_t max = devmap_device_get_devices(count, desc);
-                
-                if (pos < max) {
-                        async_data_read_finalize(callid, desc[pos].name, str_size(desc[pos].name) + 1);
-                } else {
-                        ipc_answer_0(callid, ENOENT);
-                        ipc_answer_1(rid, ENOENT, 0);
-                        return;
-                }
-                
-                free(desc);
-                
-                ipc_answer_1(rid, EOK, 1);
-        }
+                return;
+        }
+        
+        ipc_answer_0(rid, ENOENT);
 }
 
@@ -402 +588 @@
         off_t pos = (off_t) IPC_GET_ARG3(*request);
         
-        if (index != 0) {
+        if (index == 0) {
+                ipc_answer_0(rid, ENOTSUP);
+                return;
+        }
+        
+        devmap_handle_type_t type = devmap_handle_probe(index);
+        
+        if (type == DEV_HANDLE_NAMESPACE) {
+                /* Namespace directory */
+                ipc_answer_0(rid, ENOTSUP);
+                return;
+        }
+        
+        if (type == DEV_HANDLE_DEVICE) {
+                /* Device node */
                 unsigned long key[] = {
                         [DEVICES_KEY_HANDLE] = (unsigned long) index
@@ -443 +643 @@
                 /* Driver reply is the final result of the whole operation */
                 ipc_answer_1(rid, rc, bytes);
-        } else {
-                /* Read-only filesystem */
-                ipc_answer_0(rid, ENOTSUP);
-        }
+                return;
+        }
+        
+        ipc_answer_0(rid, ENOENT);
 }
 
@@ -458 +658 @@
         fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request);
         
-        if (index != 0) {
+        if (index == 0) {
+                ipc_answer_0(rid, EOK);
+                return;
+        }
+        
+        devmap_handle_type_t type = devmap_handle_probe(index);
+        
+        if (type == DEV_HANDLE_NAMESPACE) {
+                /* Namespace directory */
+                ipc_answer_0(rid, EOK);
+                return;
+        }
+        
+        if (type == DEV_HANDLE_DEVICE) {
                 unsigned long key[] = {
                         [DEVICES_KEY_HANDLE] = (unsigned long) index
@@ -482 +695 @@
                 
                 ipc_answer_0(rid, EOK);
-        } else
-                ipc_answer_0(rid, ENOTSUP);
+                return;
+        }
+        
+        ipc_answer_0(rid, ENOENT);
 }
 
@@ -490 +705 @@
         fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request);
         
-        if (index != 0) {
+        if (index == 0) {
+                ipc_answer_0(rid, EOK);
+                return;
+        }
+        
+        devmap_handle_type_t type = devmap_handle_probe(index);
+        
+        if (type == DEV_HANDLE_NAMESPACE) {
+                /* Namespace directory */
+                ipc_answer_0(rid, EOK);
+                return;
+        }
+        
+        if (type == DEV_HANDLE_DEVICE) {
                 unsigned long key[] = {
                         [DEVICES_KEY_HANDLE] = (unsigned long) index
@@ -518 +746 @@
                 /* Driver reply is the final result of the whole operation */
                 ipc_answer_0(rid, rc);
-        } else
-                ipc_answer_0(rid, ENOTSUP);
+                return;
+        }
+        
+        ipc_answer_0(rid, ENOENT);
 }