Changeset 1313ee9 in mainline

Timestamp:

2009-12-13T15:17:08Z (15 years ago)

Author:

Martin Decky <martin@…>

Branches:

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

Children:

963dd91

Parents:

fc6dd18

Message:

introduce device namespaces

• add support for explicit open in libfs (needed by devfs, but also possibly for other filesystems which need to track some stateful information)
• extend libfs to be more generic, make proper adjustments to libc, tmpfs and fat
• various updates to make use of the device namespaces
• code cleanup

Location:

uspace

Files:

• app/bdsh/cmds/modules/ls/ls.c (modified) (1 diff)
• app/init/init.c (modified) (5 diffs)
• app/tester/vfs/vfs1.c (modified) (1 diff)
• lib/libc/generic/devmap.c (modified) (10 diffs)
• lib/libc/generic/vfs/vfs.c (modified) (3 diffs)
• lib/libc/include/devmap.h (modified) (3 diffs)
• lib/libc/include/ipc/devmap.h (modified) (1 diff)
• lib/libc/include/sys/stat.h (modified) (1 diff)
• lib/libfs/libfs.c (modified) (25 diffs)
• lib/libfs/libfs.h (modified) (2 diffs)
• srv/bd/ata_bd/ata_bd.c (modified) (2 diffs)
• srv/bd/gxe_bd/gxe_bd.c (modified) (2 diffs)
• srv/bd/rd/rd.c (modified) (1 diff)
• srv/console/console.c (modified) (3 diffs)
• srv/devmap/devmap.c (modified) (27 diffs)
• srv/fs/devfs/devfs_ops.c (modified) (11 diffs)
• srv/fs/fat/fat_ops.c (modified) (6 diffs)
• srv/fs/tmpfs/tmpfs_ops.c (modified) (5 diffs)

uspace/app/bdsh/cmds/modules/ls/ls.c

@@ -100 +100 @@
         if (s.is_file)
                 printf("%-40s\t%llu\n", name, (long long) s.size);
+        else if (s.is_directory)
+                printf("%-40s\t<dir>\n", name);
         else
                 printf("%-40s\n", name);

uspace/app/init/init.c

@@ -58 +58 @@
 {
         char *opts = "";
-        const char *root_dev = "initrd";
+        const char *root_dev = "bd/initrd";
         
         if (str_cmp(fstype, "tmpfs") == 0)
@@ -97 +97 @@
         }
         
-        snprintf(null, MAX_DEVICE_NAME, "null%d", null_id);
+        snprintf(null, MAX_DEVICE_NAME, "null/%d", null_id);
         int rc = mount("devfs", "/dev", null, "", IPC_FLAG_BLOCKING);
         
@@ -170 +170 @@
         }
 
-        if (texit != TASK_EXIT_NORMAL || retval != 0) {
+        if ((texit != TASK_EXIT_NORMAL) || (retval != 0)) {
                 printf(NAME ": Server %s failed to start (returned %d)\n",
                         fname, retval);
@@ -206 +206 @@
         int rc;
 
-        printf("Trying to mount disk0 on /data... ");
+        printf("Trying to mount bd/disk0 on /data... ");
         fflush(stdout);
 
-        rc = mount("fat", "/data", "disk0", "wtcache", 0);
+        rc = mount("fat", "/data", "bd/disk0", "wtcache", 0);
         if (rc == EOK)
                 printf("OK\n");
@@ -256 +256 @@
 #endif
 
-        getvc("vc0", "/app/bdsh");
-        getvc("vc1", "/app/bdsh");
-        getvc("vc2", "/app/bdsh");
-        getvc("vc3", "/app/bdsh");
-        getvc("vc4", "/app/bdsh");
-        getvc("vc5", "/app/bdsh");
-        getvc("vc6", "/app/klog");
+        getvc("term/vc0", "/app/bdsh");
+        getvc("term/vc1", "/app/bdsh");
+        getvc("term/vc2", "/app/bdsh");
+        getvc("term/vc3", "/app/bdsh");
+        getvc("term/vc4", "/app/bdsh");
+        getvc("term/vc5", "/app/bdsh");
+        getvc("term/vc6", "/app/klog");
         
         return 0;

uspace/app/tester/vfs/vfs1.c

@@ -85 +85 @@
                 return "Unable to create null device";
         
-        snprintf(null, MAX_DEVICE_NAME, "null%d", null_id);
+        snprintf(null, MAX_DEVICE_NAME, "null/%d", null_id);
         int rc = mount(FS_TYPE, MOUNT_POINT, null, OPTIONS, FLAGS);
         switch (rc) {

uspace/lib/libc/generic/devmap.c

@@ -35 +35 @@
 #include <async.h>
 #include <errno.h>
+#include <malloc.h>
+#include <bool.h>
 
 static int devmap_phone_driver = -1;
@@ -105 +107 @@
         aid_t req = async_send_2(phone, DEVMAP_DRIVER_REGISTER, 0, 0, &answer);
         
-        ipcarg_t retval = async_data_write_start(phone, name, str_size(name) + 1);
-        
+        ipcarg_t retval = async_data_write_start(phone, name, str_size(name));
         if (retval != EOK) {
                 async_wait_for(req, NULL);
@@ -126 +127 @@
 /** Register new device.
  *
- * @param name   Device name.
- * @param handle Output: Handle to the created instance of device.
+ * @param namespace Namespace name.
+ * @param fqdn      Fully qualified device name.
+ * @param handle    Output: Handle to the created instance of device.
  *
  */
-int devmap_device_register(const char *name, dev_handle_t *handle)
+int devmap_device_register(const char *fqdn, dev_handle_t *handle)
 {
         int phone = devmap_get_phone(DEVMAP_DRIVER, IPC_FLAG_BLOCKING);
@@ -143 +145 @@
             &answer);
         
-        ipcarg_t retval = async_data_write_start(phone, name, str_size(name) + 1);
-        
+        ipcarg_t retval = async_data_write_start(phone, fqdn, str_size(fqdn));
         if (retval != EOK) {
                 async_wait_for(req, NULL);
@@ -167 +168 @@
 }
 
-int devmap_device_get_handle(const char *name, dev_handle_t *handle, unsigned int flags)
+int devmap_device_get_handle(const char *fqdn, dev_handle_t *handle, unsigned int flags)
 {
         int phone = devmap_get_phone(DEVMAP_CLIENT, flags);
@@ -180 +181 @@
             &answer);
         
-        ipcarg_t retval = async_data_write_start(phone, name, str_size(name) + 1);
-        
+        ipcarg_t retval = async_data_write_start(phone, fqdn, str_size(fqdn));
         if (retval != EOK) {
                 async_wait_for(req, NULL);
@@ -202 +202 @@
         
         return retval;
+}
+
+int devmap_namespace_get_handle(const char *name, dev_handle_t *handle, unsigned int flags)
+{
+        int phone = devmap_get_phone(DEVMAP_CLIENT, flags);
+        
+        if (phone < 0)
+                return phone;
+        
+        async_serialize_start();
+        
+        ipc_call_t answer;
+        aid_t req = async_send_2(phone, DEVMAP_NAMESPACE_GET_HANDLE, flags, 0,
+            &answer);
+        
+        ipcarg_t retval = async_data_write_start(phone, name, str_size(name));
+        if (retval != EOK) {
+                async_wait_for(req, NULL);
+                async_serialize_end();
+                return retval;
+        }
+        
+        async_wait_for(req, &retval);
+        
+        async_serialize_end();
+        
+        if (retval != EOK) {
+                if (handle != NULL)
+                        *handle = (dev_handle_t) -1;
+                return retval;
+        }
+        
+        if (handle != NULL)
+                *handle = (dev_handle_t) IPC_GET_ARG1(answer);
+        
+        return retval;
+}
+
+devmap_handle_type_t devmap_handle_probe(dev_handle_t handle)
+{
+        int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
+        
+        if (phone < 0)
+                return phone;
+        
+        ipcarg_t type;
+        int retval = async_req_1_1(phone, DEVMAP_HANDLE_PROBE, handle, &type);
+        if (retval != EOK)
+                return DEV_HANDLE_NONE;
+        
+        return (devmap_handle_type_t) type;
 }
 
@@ -227 +278 @@
         
         ipcarg_t null_id;
-        int retval = async_req_0_1(phone, DEVMAP_DEVICE_NULL_CREATE, &null_id);
+        int retval = async_req_0_1(phone, DEVMAP_NULL_CREATE, &null_id);
         if (retval != EOK)
                 return -1;
@@ -241 +292 @@
                 return;
         
-        async_req_1_0(phone, DEVMAP_DEVICE_NULL_DESTROY, (ipcarg_t) null_id);
-}
-
-ipcarg_t devmap_device_get_count(void)
-{
-        int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
-        
-        if (phone < 0)
-                return 0;
-        
+        async_req_1_0(phone, DEVMAP_NULL_DESTROY, (ipcarg_t) null_id);
+}
+
+static size_t devmap_count_namespaces_internal(int phone)
+{
         ipcarg_t count;
-        int retval = async_req_0_1(phone, DEVMAP_DEVICE_GET_COUNT, &count);
+        int retval = async_req_0_1(phone, DEVMAP_GET_NAMESPACE_COUNT, &count);
         if (retval != EOK)
                 return 0;
@@ -259 +305 @@
 }
 
-ipcarg_t devmap_device_get_devices(ipcarg_t count, dev_desc_t *data)
-{
-        int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
-        
-        if (phone < 0)
-                return 0;
-        
-        async_serialize_start();
-        
-        ipc_call_t answer;
-        aid_t req = async_send_0(phone, DEVMAP_DEVICE_GET_DEVICES, &answer);
-        
-        ipcarg_t retval = async_data_read_start(phone, data, count * sizeof(dev_desc_t));
-        
-        if (retval != EOK) {
-                async_wait_for(req, NULL);
-                async_serialize_end();
-                return 0;
-        }
-        
-        async_wait_for(req, &retval);
-        
-        async_serialize_end();
-        
+static size_t devmap_count_devices_internal(int phone, dev_handle_t ns_handle)
+{
+        ipcarg_t count;
+        int retval = async_req_1_1(phone, DEVMAP_GET_DEVICE_COUNT, ns_handle, &count);
         if (retval != EOK)
                 return 0;
         
-        return IPC_GET_ARG1(answer);
-}
+        return count;
+}
+
+size_t devmap_count_namespaces(void)
+{
+        int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
+        
+        if (phone < 0)
+                return 0;
+        
+        return devmap_count_namespaces_internal(phone);
+}
+
+size_t devmap_count_devices(dev_handle_t ns_handle)
+{
+        int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
+        
+        if (phone < 0)
+                return 0;
+        
+        return devmap_count_devices_internal(phone, ns_handle);
+}
+
+size_t devmap_get_namespaces(dev_desc_t **data)
+{
+        int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
+        
+        if (phone < 0)
+                return 0;
+        
+        /* Loop until namespaces read succesful */
+        while (true) {
+                size_t count = devmap_count_namespaces_internal(phone);
+                if (count == 0)
+                        return 0;
+                
+                dev_desc_t *devs = (dev_desc_t *) calloc(count, sizeof(dev_desc_t));
+                if (devs == NULL)
+                        return 0;
+                
+                async_serialize_start();
+                
+                ipc_call_t answer;
+                aid_t req = async_send_0(phone, DEVMAP_GET_NAMESPACES, &answer);
+                
+                int rc = async_data_read_start(phone, devs, count * sizeof(dev_desc_t));
+                if (rc == EOVERFLOW) {
+                        /*
+                         * Number of namespaces has changed since
+                         * the last call of DEVMAP_DEVICE_GET_NAMESPACE_COUNT
+                         */
+                        async_serialize_end();
+                        free(devs);
+                        continue;
+                }
+                
+                if (rc != EOK) {
+                        async_wait_for(req, NULL);
+                        async_serialize_end();
+                        free(devs);
+                        return 0;
+                }
+                
+                ipcarg_t retval;
+                async_wait_for(req, &retval);
+                async_serialize_end();
+                
+                if (retval != EOK)
+                        return 0;
+                
+                *data = devs;
+                return count;
+        }
+}
+
+size_t devmap_get_devices(dev_handle_t ns_handle, dev_desc_t **data)
+{
+        int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
+        
+        if (phone < 0)
+                return 0;
+        
+        /* Loop until namespaces read succesful */
+        while (true) {
+                size_t count = devmap_count_devices_internal(phone, ns_handle);
+                if (count == 0)
+                        return 0;
+                
+                dev_desc_t *devs = (dev_desc_t *) calloc(count, sizeof(dev_desc_t));
+                if (devs == NULL)
+                        return 0;
+                
+                async_serialize_start();
+                
+                ipc_call_t answer;
+                aid_t req = async_send_1(phone, DEVMAP_GET_DEVICES, ns_handle, &answer);
+                
+                int rc = async_data_read_start(phone, devs, count * sizeof(dev_desc_t));
+                if (rc == EOVERFLOW) {
+                        /*
+                         * Number of devices has changed since
+                         * the last call of DEVMAP_DEVICE_GET_DEVICE_COUNT
+                         */
+                        async_serialize_end();
+                        free(devs);
+                        continue;
+                }
+                
+                if (rc != EOK) {
+                        async_wait_for(req, NULL);
+                        async_serialize_end();
+                        free(devs);
+                        return 0;
+                }
+                
+                ipcarg_t retval;
+                async_wait_for(req, &retval);
+                async_serialize_end();
+                
+                if (retval != EOK)
+                        return 0;
+                
+                *data = devs;
+                return count;
+        }
+}

uspace/lib/libc/generic/vfs/vfs.c

@@ -117 +117 @@
 }
 
-int mount(const char *fs_name, const char *mp, const char *dev,
+int mount(const char *fs_name, const char *mp, const char *fqdn,
     const char *opts, unsigned int flags)
 {
@@ -126 +126 @@
         dev_handle_t dev_handle;
         
-        res = devmap_device_get_handle(dev, &dev_handle, flags);
+        res = devmap_device_get_handle(fqdn, &dev_handle, flags);
         if (res != EOK)
                 return res;
@@ -703 +703 @@
         rc = fstat(fildes, &stat);
 
-        if (!stat.devfs_stat.device)
+        if (!stat.device)
                 return -1;
         
-        return devmap_device_connect(stat.devfs_stat.device, 0);
+        return devmap_device_connect(stat.device, 0);
 }
 

uspace/lib/libc/include/devmap.h

@@ -38 +38 @@
 #include <ipc/devmap.h>
 #include <async.h>
+#include <bool.h>
 
 extern int devmap_get_phone(devmap_interface_t, unsigned int);
@@ -46 +47 @@
 
 extern int devmap_device_get_handle(const char *, dev_handle_t *, unsigned int);
+extern int devmap_namespace_get_handle(const char *, dev_handle_t *, unsigned int);
+extern devmap_handle_type_t devmap_handle_probe(dev_handle_t);
+
 extern int devmap_device_connect(dev_handle_t, unsigned int);
 
@@ -51 +55 @@
 extern void devmap_null_destroy(int);
 
-extern ipcarg_t devmap_device_get_count(void);
-extern ipcarg_t devmap_device_get_devices(ipcarg_t, dev_desc_t *);
+extern size_t devmap_count_namespaces(void);
+extern size_t devmap_count_devices(dev_handle_t);
+
+extern size_t devmap_get_namespaces(dev_desc_t **);
+extern size_t devmap_get_devices(dev_handle_t, dev_desc_t **);
 
 #endif

uspace/lib/libc/include/ipc/devmap.h

@@ -43 +43 @@
 
 typedef enum {
+        DEV_HANDLE_NONE,
+        DEV_HANDLE_NAMESPACE,
+        DEV_HANDLE_DEVICE
+} devmap_handle_type_t;
+
+typedef enum {
         DEVMAP_DRIVER_REGISTER = IPC_FIRST_USER_METHOD,
         DEVMAP_DRIVER_UNREGISTER,
         DEVMAP_DEVICE_REGISTER,
         DEVMAP_DEVICE_UNREGISTER,
-        DEVMAP_DEVICE_GET_NAME,
         DEVMAP_DEVICE_GET_HANDLE,
-        DEVMAP_DEVICE_NULL_CREATE,
-        DEVMAP_DEVICE_NULL_DESTROY,
-        DEVMAP_DEVICE_GET_COUNT,
-        DEVMAP_DEVICE_GET_DEVICES
+        DEVMAP_NAMESPACE_GET_HANDLE,
+        DEVMAP_HANDLE_PROBE,
+        DEVMAP_NULL_CREATE,
+        DEVMAP_NULL_DESTROY,
+        DEVMAP_GET_NAMESPACE_COUNT,
+        DEVMAP_GET_DEVICE_COUNT,
+        DEVMAP_GET_NAMESPACES,
+        DEVMAP_GET_DEVICES
 } devmap_request_t;
 

uspace/lib/libc/include/sys/stat.h

@@ -42 +42 @@
 
 struct stat {
-        fs_handle_t     fs_handle;
-        dev_handle_t    dev_handle;
-        fs_index_t      index;
-        unsigned        lnkcnt;
-        bool            is_file;
-        off_t           size;
-        union {
-                struct {
-                        dev_handle_t    device;
-                } devfs_stat;
-        };
+        fs_handle_t fs_handle;
+        dev_handle_t dev_handle;
+        fs_index_t index;
+        unsigned int lnkcnt;
+        bool is_file;
+        bool is_directory;
+        off_t size;
+        dev_handle_t device;
 };
 

uspace/lib/libfs/libfs.c

@@ -1 +1 @@
 /*
- * Copyright (c) 2009 Jakub Jermar 
+ * Copyright (c) 2009 Jakub Jermar
  * All rights reserved.
  *
@@ -27 +27 @@
  */
 
-/** @addtogroup libfs 
+/** @addtogroup libfs
  * @{
- */ 
+ */
 /**
  * @file
- * Glue code which is commonod to all FS implementations. 
- */
-
-#include "libfs.h" 
+ * Glue code which is common to all FS implementations.
+ */
+
+#include "libfs.h"
 #include "../../srv/vfs/vfs.h"
 #include <errno.h>
@@ -67 +67 @@
  * code.
  *
- * @param vfs_phone     Open phone for communication with VFS.
- * @param reg           File system registration structure. It will be
- *                      initialized by this function.
- * @param info          VFS info structure supplied by the file system
- *                      implementation.
- * @param conn          Connection fibril for handling all calls originating in
- *                      VFS.
- *
- * @return              EOK on success or a non-zero error code on errror.
+ * @param vfs_phone Open phone for communication with VFS.
+ * @param reg       File system registration structure. It will be
+ *                  initialized by this function.
+ * @param info      VFS info structure supplied by the file system
+ *                  implementation.
+ * @param conn      Connection fibril for handling all calls originating in
+ *                  VFS.
+ *
+ * @return EOK on success or a non-zero error code on errror.
+ *
  */
 int fs_register(int vfs_phone, fs_reg_t *reg, vfs_info_t *info,
@@ -87 +88 @@
         ipc_call_t answer;
         aid_t req = async_send_0(vfs_phone, VFS_IN_REGISTER, &answer);
-
+        
         /*
          * Send our VFS info structure to VFS.
@@ -96 +97 @@
                 return rc;
         }
-
+        
         /*
          * Ask VFS for callback connection.
          */
         ipc_connect_to_me(vfs_phone, 0, 0, 0, &reg->vfs_phonehash);
-
+        
         /*
          * Allocate piece of address space for PLB.
@@ -110 +111 @@
                 return ENOMEM;
         }
-
+        
         /*
          * Request sharing the Path Lookup Buffer with VFS.
@@ -136 +137 @@
          */
         async_set_client_connection(conn);
-
+        
         return IPC_GET_RETVAL(answer);
 }
@@ -154 +155 @@
         int res;
         ipcarg_t rc;
-
+        
         ipc_call_t call;
         ipc_callid_t callid;
-
-        /* accept the phone */
+        
+        /* Accept the phone */
         callid = async_get_call(&call);
         int mountee_phone = (int)IPC_GET_ARG1(call);
         if ((IPC_GET_METHOD(call) != IPC_M_CONNECTION_CLONE) ||
-            mountee_phone < 0) {
+            (mountee_phone < 0)) {
                 ipc_answer_0(callid, EINVAL);
                 ipc_answer_0(rid, EINVAL);
                 return;
         }
-        ipc_answer_0(callid, EOK);      /* acknowledge the mountee_phone */
+        
+        /* Acknowledge the mountee_phone */
+        ipc_answer_0(callid, EOK);
         
         res = async_data_write_receive(&callid, NULL);
@@ -176 +179 @@
                 return;
         }
-
+        
         fs_node_t *fn;
         res = ops->node_get(&fn, mp_dev_handle, mp_fs_index);
-        if (res != EOK || !fn) {
+        if ((res != EOK) || (!fn)) {
                 ipc_hangup(mountee_phone);
                 ipc_answer_0(callid, combine_rc(res, ENOENT));
@@ -185 +188 @@
                 return;
         }
-
+        
         if (fn->mp_data.mp_active) {
                 ipc_hangup(mountee_phone);
@@ -193 +196 @@
                 return;
         }
-
+        
         rc = async_req_0_0(mountee_phone, IPC_M_CONNECT_ME);
         if (rc != EOK) {
@@ -215 +218 @@
                 fn->mp_data.phone = mountee_phone;
         }
+        
         /*
          * Do not release the FS node so that it stays in memory.
@@ -238 +242 @@
     ipc_call_t *request)
 {
-        unsigned first = IPC_GET_ARG1(*request);
-        unsigned last = IPC_GET_ARG2(*request);
-        unsigned next = first;
+        unsigned int first = IPC_GET_ARG1(*request);
+        unsigned int last = IPC_GET_ARG2(*request);
+        unsigned int next = first;
         dev_handle_t dev_handle = IPC_GET_ARG3(*request);
         int lflag = IPC_GET_ARG4(*request);
-        fs_index_t index = IPC_GET_ARG5(*request); /* when L_LINK specified */
+        fs_index_t index = IPC_GET_ARG5(*request);
         char component[NAME_MAX + 1];
         int len;
         int rc;
-
+        
         if (last < next)
                 last += PLB_SIZE;
-
+        
         fs_node_t *par = NULL;
         fs_node_t *cur = NULL;
         fs_node_t *tmp = NULL;
-
+        
         rc = ops->root_get(&cur, dev_handle);
         on_error(rc, goto out_with_answer);
-
+        
         if (cur->mp_data.mp_active) {
                 ipc_forward_slow(rid, cur->mp_data.phone, VFS_OUT_LOOKUP,
@@ -265 +269 @@
                 return;
         }
-
+        
+        /* Eat slash */
         if (ops->plb_get_char(next) == '/')
-                next++;         /* eat slash */
+                next++;
         
         while (next <= last) {
                 bool has_children;
-
+                
                 rc = ops->has_children(&has_children, cur);
                 on_error(rc, goto out_with_answer);
                 if (!has_children)
                         break;
-
-                /* collect the component */
+                
+                /* Collect the component */
                 len = 0;
-                while ((next <= last) &&  (ops->plb_get_char(next) != '/')) {
+                while ((next <= last) && (ops->plb_get_char(next) != '/')) {
                         if (len + 1 == NAME_MAX) {
-                                /* component length overflow */
+                                /* Component length overflow */
                                 ipc_answer_0(rid, ENAMETOOLONG);
                                 goto out;
                         }
                         component[len++] = ops->plb_get_char(next);
-                        next++; /* process next character */
+                        /* Process next character */
+                        next++;
                 }
-
+                
                 assert(len);
                 component[len] = '\0';
-                next++;         /* eat slash */
-
-                /* match the component */
+                /* Eat slash */
+                next++;
+                
+                /* Match the component */
                 rc = ops->match(&tmp, cur, component);
                 on_error(rc, goto out_with_answer);
-
-                if (tmp && tmp->mp_data.mp_active) {
+                
+                if ((tmp) && (tmp->mp_data.mp_active)) {
                         if (next > last)
                                 next = last = first;
                         else
                                 next--;
-                                
+                        
                         ipc_forward_slow(rid, tmp->mp_data.phone,
                             VFS_OUT_LOOKUP, next, last, tmp->mp_data.dev_handle,
@@ -312 +319 @@
                         return;
                 }
-
-                /* handle miss: match amongst siblings */
+                
+                /* Handle miss: match amongst siblings */
                 if (!tmp) {
                         if (next <= last) {
-                                /* there are unprocessed components */
+                                /* There are unprocessed components */
                                 ipc_answer_0(rid, ENOENT);
                                 goto out;
                         }
-                        /* miss in the last component */
-                        if (lflag & (L_CREATE | L_LINK)) { 
-                                /* request to create a new link */
+                        
+                        /* Miss in the last component */
+                        if (lflag & (L_CREATE | L_LINK)) {
+                                /* Request to create a new link */
                                 if (!ops->is_directory(cur)) {
                                         ipc_answer_0(rid, ENOTDIR);
                                         goto out;
                                 }
+                                
                                 fs_node_t *fn;
                                 if (lflag & L_CREATE)
@@ -335 +344 @@
                                             index);
                                 on_error(rc, goto out_with_answer);
+                                
                                 if (fn) {
                                         rc = ops->link(cur, fn, component);
@@ -349 +359 @@
                                                 (void) ops->node_put(fn);
                                         }
-                                } else {
+                                } else
                                         ipc_answer_0(rid, ENOSPC);
-                                }
+                                
                                 goto out;
-                        } 
+                        }
+                        
                         ipc_answer_0(rid, ENOENT);
                         goto out;
                 }
-
+                
                 if (par) {
                         rc = ops->node_put(par);
                         on_error(rc, goto out_with_answer);
                 }
-
-                /* descend one level */
+                
+                /* Descend one level */
                 par = cur;
                 cur = tmp;
                 tmp = NULL;
         }
-
-        /* handle miss: excessive components */
+        
+        /* Handle miss: excessive components */
         if (next <= last) {
                 bool has_children;
-
                 rc = ops->has_children(&has_children, cur);
                 on_error(rc, goto out_with_answer);
+                
                 if (has_children)
                         goto skip_miss;
-
+                
                 if (lflag & (L_CREATE | L_LINK)) {
                         if (!ops->is_directory(cur)) {
@@ -383 +394 @@
                                 goto out;
                         }
-
-                        /* collect next component */
+                        
+                        /* Collect next component */
                         len = 0;
                         while (next <= last) {
                                 if (ops->plb_get_char(next) == '/') {
-                                        /* more than one component */
+                                        /* More than one component */
                                         ipc_answer_0(rid, ENOENT);
                                         goto out;
                                 }
+                                
                                 if (len + 1 == NAME_MAX) {
-                                        /* component length overflow */
+                                        /* Component length overflow */
                                         ipc_answer_0(rid, ENAMETOOLONG);
                                         goto out;
                                 }
+                                
                                 component[len++] = ops->plb_get_char(next);
-                                next++; /* process next character */
+                                /* Process next character */
+                                next++;
                         }
+                        
                         assert(len);
                         component[len] = '\0';
-                                
+                        
                         fs_node_t *fn;
                         if (lflag & L_CREATE)
@@ -409 +424 @@
                                 rc = ops->node_get(&fn, dev_handle, index);
                         on_error(rc, goto out_with_answer);
+                        
                         if (fn) {
                                 rc = ops->link(cur, fn, component);
@@ -423 +439 @@
                                         (void) ops->node_put(fn);
                                 }
-                        } else {
+                        } else
                                 ipc_answer_0(rid, ENOSPC);
-                        }
+                        
                         goto out;
                 }
+                
                 ipc_answer_0(rid, ENOENT);
                 goto out;
         }
+        
 skip_miss:
-
-        /* handle hit */
+        
+        /* Handle hit */
         if (lflag & L_UNLINK) {
-                unsigned old_lnkcnt = ops->lnkcnt_get(cur);
+                unsigned int old_lnkcnt = ops->lnkcnt_get(cur);
                 rc = ops->unlink(par, cur, component);
-                ipc_answer_5(rid, (ipcarg_t)rc, fs_handle, dev_handle,
+                ipc_answer_5(rid, (ipcarg_t) rc, fs_handle, dev_handle,
                     ops->index_get(cur), ops->size_get(cur), old_lnkcnt);
                 goto out;
         }
+        
         if (((lflag & (L_CREATE | L_EXCLUSIVE)) == (L_CREATE | L_EXCLUSIVE)) ||
             (lflag & L_LINK)) {
@@ -446 +465 @@
                 goto out;
         }
+        
         if ((lflag & L_FILE) && (ops->is_directory(cur))) {
                 ipc_answer_0(rid, EISDIR);
                 goto out;
         }
+        
         if ((lflag & L_DIRECTORY) && (ops->is_file(cur))) {
                 ipc_answer_0(rid, ENOTDIR);
                 goto out;
         }
-
+        
 out_with_answer:
+        
         if (rc == EOK) {
-                ipc_answer_5(rid, EOK, fs_handle, dev_handle,
+                if (lflag & L_OPEN)
+                        rc = ops->node_open(cur);
+                
+                ipc_answer_5(rid, rc, fs_handle, dev_handle,
                     ops->index_get(cur), ops->size_get(cur),
                     ops->lnkcnt_get(cur));
-        } else {
+        } else
                 ipc_answer_0(rid, rc);
-        }
-
+        
 out:
+        
         if (par)
                 (void) ops->node_put(par);
+        
         if (cur)
                 (void) ops->node_put(cur);
+        
         if (tmp)
                 (void) ops->node_put(tmp);
@@ -478 +505 @@
         dev_handle_t dev_handle = (dev_handle_t) IPC_GET_ARG1(*request);
         fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request);
+        
         fs_node_t *fn;
-        int rc;
-
-        rc = ops->node_get(&fn, dev_handle, index);
+        int rc = ops->node_get(&fn, dev_handle, index);
         on_error(rc, answer_and_return(rid, rc));
-
+        
         ipc_callid_t callid;
         size_t size;
-        if (!async_data_read_receive(&callid, &size) ||
-            size != sizeof(struct stat)) {
+        if ((!async_data_read_receive(&callid, &size)) ||
+            (size != sizeof(struct stat))) {
+                ops->node_put(fn);
                 ipc_answer_0(callid, EINVAL);
                 ipc_answer_0(rid, EINVAL);
                 return;
         }
-
+        
         struct stat stat;
         memset(&stat, 0, sizeof(struct stat));
@@ -499 +526 @@
         stat.dev_handle = dev_handle;
         stat.index = index;
-        stat.lnkcnt = ops->lnkcnt_get(fn); 
+        stat.lnkcnt = ops->lnkcnt_get(fn);
         stat.is_file = ops->is_file(fn);
+        stat.is_directory = ops->is_directory(fn);
         stat.size = ops->size_get(fn);
-
+        stat.device = ops->device_get(fn);
+        
+        ops->node_put(fn);
+        
         async_data_read_finalize(callid, &stat, sizeof(struct stat));
         ipc_answer_0(rid, EOK);
@@ -509 +540 @@
 /** Open VFS triplet.
  *
- * @param ops       libfs operations structure with function pointers to
- *                  file system implementation
- * @param rid       Request ID of the VFS_OUT_OPEN_NODE request.
- * @param request   VFS_OUT_OPEN_NODE request data itself.
+ * @param ops     libfs operations structure with function pointers to
+ *                file system implementation
+ * @param rid     Request ID of the VFS_OUT_OPEN_NODE request.
+ * @param request VFS_OUT_OPEN_NODE request data itself.
  *
  */
@@ -531 +562 @@
         }
         
-        ipc_answer_3(rid, EOK, ops->size_get(fn), ops->lnkcnt_get(fn),
+        rc = ops->node_open(fn);
+        ipc_answer_3(rid, rc, ops->size_get(fn), ops->lnkcnt_get(fn),
             (ops->is_file(fn) ? L_FILE : 0) | (ops->is_directory(fn) ? L_DIRECTORY : 0));
         

uspace/lib/libfs/libfs.h

@@ -64 +64 @@
         int (* match)(fs_node_t **, fs_node_t *, const char *);
         int (* node_get)(fs_node_t **, dev_handle_t, fs_index_t);
+        int (* node_open)(fs_node_t *);
         int (* node_put)(fs_node_t *);
         int (* create)(fs_node_t **, dev_handle_t, int);
@@ -76 +77 @@
         fs_index_t (* index_get)(fs_node_t *);
         size_t (* size_get)(fs_node_t *);
-        unsigned (* lnkcnt_get)(fs_node_t *);
+        unsigned int (* lnkcnt_get)(fs_node_t *);
         char (* plb_get_char)(unsigned pos);
         bool (* is_directory)(fs_node_t *);
         bool (* is_file)(fs_node_t *);
+        dev_handle_t (* device_get)(fs_node_t *);
 } libfs_ops_t;
 

uspace/srv/bd/ata_bd/ata_bd.c

@@ -66 +66 @@
 #include "ata_bd.h"
 
-#define NAME "ata_bd"
+#define NAME       "ata_bd"
+#define NAMESPACE  "bd"
 
 /** Physical block size. Should be always 512. */
@@ -135 +136 @@
                 if (disk[i].present == false)
                         continue;
-
-                snprintf(name, 16, "disk%d", i);
+                
+                snprintf(name, 16, "%s/disk%d", NAMESPACE, i);
                 rc = devmap_device_register(name, &disk[i].dev_handle);
                 if (rc != EOK) {
                         devmap_hangup_phone(DEVMAP_DRIVER);
-                        printf(NAME ": Unable to register device %s.\n",
-                                name);
+                        printf(NAME ": Unable to register device %s.\n", name);
                         return rc;
                 }

uspace/srv/bd/gxe_bd/gxe_bd.c

@@ -50 +50 @@
 #include <task.h>
 
-#define NAME "gxe_bd"
+#define NAME       "gxe_bd"
+#define NAMESPACE  "bd"
 
 enum {
@@ -141 +142 @@
 
         for (i = 0; i < MAX_DISKS; i++) {
-                snprintf(name, 16, "disk%d", i);
+                snprintf(name, 16, "%s/disk%d", NAMESPACE, i);
                 rc = devmap_device_register(name, &dev_handle[i]);
                 if (rc != EOK) {
                         devmap_hangup_phone(DEVMAP_DRIVER);
-                        printf(NAME ": Unable to register device %s.\n",
-                                name);
+                        printf(NAME ": Unable to register device %s.\n", name);
                         return rc;
                 }

uspace/srv/bd/rd/rd.c

@@ -228 +228 @@
         
         dev_handle_t dev_handle;
-        if (devmap_device_register("initrd", &dev_handle) != EOK) {
+        if (devmap_device_register("bd/initrd", &dev_handle) != EOK) {
                 devmap_hangup_phone(DEVMAP_DRIVER);
                 printf(NAME ": Unable to register device\n");

uspace/srv/console/console.c

@@ -57 +57 @@
 #include "screenbuffer.h"
 
-#define NAME  "console"
-
-#define MAX_DEVICE_NAME  32
+#define NAME       "console"
+#define NAMESPACE  "term"
 
 /** Phone to the keyboard driver. */
@@ -69 +68 @@
         ipcarg_t cols;  /**< Framebuffer columns */
         ipcarg_t rows;  /**< Framebuffer rows */
-        int color_cap;  /**< Color capabilities (FB_CCAP_xxx) */
+        int color_cap;  /**< Color capabilities (FB_CCAP_xxx) */
 } fb_info;
 
@@ -740 +739 @@
                         consoles[i].refcount = 0;
                         
-                        char vc[MAX_DEVICE_NAME];
-                        snprintf(vc, MAX_DEVICE_NAME, "vc%u", i);
+                        char vc[DEVMAP_NAME_MAXLEN + 1];
+                        snprintf(vc, DEVMAP_NAME_MAXLEN, "%s/vc%u", NAMESPACE, i);
                         
                         if (devmap_device_register(vc, &consoles[i].dev_handle) != EOK) {

uspace/srv/devmap/devmap.c

@@ -68 +68 @@
 } devmap_driver_t;
 
+/** Info about registered namespaces
+ *
+ */
+typedef struct {
+        /** Pointer to the previous and next device in the list of all namespaces */
+        link_t namespaces;
+        /** Unique namespace identifier */
+        dev_handle_t handle;
+        /** Namespace name */
+        char *name;
+        /** Reference count */
+        size_t refcnt;
+} devmap_namespace_t;
+
 /** Info about registered device
  *
@@ -77 +91 @@
             owned by one driver */
         link_t driver_devices;
-        /** Unique device identifier  */
+        /** Unique device identifier */
         dev_handle_t handle;
+        /** Device namespace */
+        devmap_namespace_t *namespace;
         /** Device name */
         char *name;
@@ -86 +102 @@
 
 LIST_INITIALIZE(devices_list);
+LIST_INITIALIZE(namespaces_list);
 LIST_INITIALIZE(drivers_list);
 
@@ -117 +134 @@
 }
 
+/** Convert fully qualified device name to namespace and device name.
+ *
+ * A fully qualified device name can be either a plain device name
+ * (then the namespace is considered to be an empty string) or consist
+ * of two components separated by a slash. No more than one slash
+ * is allowed.
+ *
+ */
+static bool devmap_fqdn_split(const char *fqdn, char **ns_name, char **name)
+{
+        size_t cnt = 0;
+        size_t slash_offset = 0;
+        size_t slash_after = 0;
+        
+        size_t offset = 0;
+        size_t offset_prev = 0;
+        wchar_t c;
+        
+        while ((c = str_decode(fqdn, &offset, STR_NO_LIMIT)) != 0) {
+                if (c == '/') {
+                        cnt++;
+                        slash_offset = offset_prev;
+                        slash_after = offset;
+                }
+                offset_prev = offset;
+        }
+        
+        /* More than one slash */
+        if (cnt > 1)
+                return false;
+        
+        /* No slash -> namespace is empty */
+        if (cnt == 0) {
+                *ns_name = str_dup("");
+                if (*ns_name == NULL)
+                        return false;
+                
+                *name = str_dup(fqdn);
+                if ((*name == NULL) || (str_cmp(*name, "") == 0)) {
+                        free(*ns_name);
+                        return false;
+                }
+                
+                return true;
+        }
+        
+        /* Exactly one slash */
+        *ns_name = str_ndup(fqdn, slash_offset);
+        if (*ns_name == NULL)
+                return false;
+        
+        *name = str_dup(fqdn + slash_after);
+        if ((*name == NULL) || (str_cmp(*name, "") == 0)) {
+                free(*ns_name);
+                return false;
+        }
+        
+        return true;
+}
+
+/** Find namespace with given name.
+ *
+ * The devices_list_mutex should be already held when
+ * calling this function.
+ *
+ */
+static devmap_namespace_t *devmap_namespace_find_name(const char *name)
+{
+        link_t *item = namespaces_list.next;
+        
+        while (item != &namespaces_list) {
+                devmap_namespace_t *namespace = list_get_instance(item, devmap_namespace_t, namespaces);
+                if (str_cmp(namespace->name, name) == 0)
+                        return namespace;
+                item = item->next;
+        }
+        
+        return NULL;
+}
+
+/** Find namespace with given handle.
+ *
+ * The devices_list_mutex should be already held when
+ * calling this function.
+ *
+ * @todo: use hash table
+ *
+ */
+static devmap_namespace_t *devmap_namespace_find_handle(dev_handle_t handle)
+{
+        link_t *item = namespaces_list.next;
+        
+        while (item != &namespaces_list) {
+                devmap_namespace_t *namespace = list_get_instance(item, devmap_namespace_t, namespaces);
+                if (namespace->handle == handle)
+                        return namespace;
+                
+                item = item->next;
+        }
+        
+        return NULL;
+}
+
 /** Find device with given name.
  *
- */
-static devmap_device_t *devmap_device_find_name(const char *name)
+ * The devices_list_mutex should be already held when
+ * calling this function.
+ *
+ */
+static devmap_device_t *devmap_device_find_name(const char *ns_name,
+    const char *name)
 {
         link_t *item = devices_list.next;
-        devmap_device_t *device = NULL;
         
         while (item != &devices_list) {
-                device = list_get_instance(item, devmap_device_t, devices);
-                if (str_cmp(device->name, name) == 0)
-                        break;
+                devmap_device_t *device = list_get_instance(item, devmap_device_t, devices);
+                if ((str_cmp(device->namespace->name, ns_name) == 0) && (str_cmp(device->name, name) == 0))
+                        return device;
                 item = item->next;
         }
         
-        if (item == &devices_list)
+        return NULL;
+}
+
+/** Find device with given handle.
+ *
+ * The devices_list_mutex should be already held when
+ * calling this function.
+ *
+ * @todo: use hash table
+ *
+ */
+static devmap_device_t *devmap_device_find_handle(dev_handle_t handle)
+{
+        link_t *item = devices_list.next;
+        
+        while (item != &devices_list) {
+                devmap_device_t *device = list_get_instance(item, devmap_device_t, devices);
+                if (device->handle == handle)
+                        return device;
+                
+                item = item->next;
+        }
+        
+        return NULL;
+}
+
+/** Create a namespace (if not already present)
+ *
+ * The devices_list_mutex should be already held when
+ * calling this function.
+ *
+ */
+static devmap_namespace_t *devmap_namespace_create(const char *ns_name)
+{
+        devmap_namespace_t *namespace = devmap_namespace_find_name(ns_name);
+        if (namespace != NULL)
+                return namespace;
+        
+        namespace = (devmap_namespace_t *) malloc(sizeof(devmap_namespace_t));
+        if (namespace == NULL)
                 return NULL;
         
-        device = list_get_instance(item, devmap_device_t, devices);
-        return device;
-}
-
-/** Find device with given handle.
- *
- * @todo: use hash table
- *
- */
-static devmap_device_t *devmap_device_find_handle(dev_handle_t handle)
-{
-        fibril_mutex_lock(&devices_list_mutex);
-        
-        link_t *item = (&devices_list)->next;
-        devmap_device_t *device = NULL;
-        
-        while (item != &devices_list) {
-                device = list_get_instance(item, devmap_device_t, devices);
-                if (device->handle == handle)
-                        break;
-                item = item->next;
-        }
-        
-        if (item == &devices_list) {
-                fibril_mutex_unlock(&devices_list_mutex);
+        namespace->name = str_dup(ns_name);
+        if (namespace->name == NULL) {
+                free(namespace);
                 return NULL;
         }
         
-        device = list_get_instance(item, devmap_device_t, devices);
-        
-        fibril_mutex_unlock(&devices_list_mutex);
-        
-        return device;
-}
-
-/**
- * Unregister device and free it. It's assumed that driver's device list is
- * already locked.
- */
-static int devmap_device_unregister_core(devmap_device_t *device)
-{
+        namespace->handle = devmap_create_handle();
+        namespace->refcnt = 0;
+        
+        /*
+         * Insert new namespace into list of registered namespaces
+         */
+        list_append(&(namespace->namespaces), &namespaces_list);
+        
+        return namespace;
+}
+
+/** Destroy a namespace (if it is no longer needed)
+ *
+ * The devices_list_mutex should be already held when
+ * calling this function.
+ *
+ */
+static void devmap_namespace_destroy(devmap_namespace_t *namespace)
+{
+        if (namespace->refcnt == 0) {
+                list_remove(&(namespace->namespaces));
+                
+                free(namespace->name);
+                free(namespace);
+        }
+}
+
+/** Increase namespace reference count by including device
+ *
+ * The devices_list_mutex should be already held when
+ * calling this function.
+ *
+ */
+static void devmap_namespace_addref(devmap_namespace_t *namespace,
+    devmap_device_t *device)
+{
+        device->namespace = namespace;
+        namespace->refcnt++;
+}
+
+/** Decrease namespace reference count
+ *
+ * The devices_list_mutex should be already held when
+ * calling this function.
+ *
+ */
+static void devmap_namespace_delref(devmap_namespace_t *namespace)
+{
+        namespace->refcnt--;
+        devmap_namespace_destroy(namespace);
+}
+
+/** Unregister device and free it
+ *
+ * The devices_list_mutex should be already held when
+ * calling this function.
+ *
+ */
+static void devmap_device_unregister_core(devmap_device_t *device)
+{
+        devmap_namespace_delref(device->namespace);
         list_remove(&(device->devices));
         list_remove(&(device->driver_devices));
         
+        free(device->namespace);
         free(device->name);
         free(device);
-        
-        return EOK;
 }
 
@@ -189 +376 @@
  * drivers.
  */
-static void devmap_driver_register(devmap_driver_t **odriver)
-{
-        *odriver = NULL;
-        
+static devmap_driver_t *devmap_driver_register(void)
+{
         ipc_call_t icall;
         ipc_callid_t iid = async_get_call(&icall);
@@ -198 +383 @@
         if (IPC_GET_METHOD(icall) != DEVMAP_DRIVER_REGISTER) {
                 ipc_answer_0(iid, EREFUSED);
-                return;
+                return NULL;
         }
         
@@ -205 +390 @@
         if (driver == NULL) {
                 ipc_answer_0(iid, ENOMEM);
-                return;
+                return NULL;
         }
         
@@ -211 +396 @@
          * Get driver name
          */
-        ipc_callid_t callid;
-        size_t name_size;
-        if (!async_data_write_receive(&callid, &name_size)) {
+        int rc = async_data_string_receive(&driver->name, DEVMAP_NAME_MAXLEN);
+        if (rc != EOK) {
                 free(driver);
-                ipc_answer_0(callid, EREFUSED);
-                ipc_answer_0(iid, EREFUSED);
-                return;
-        }
-        
-        if (name_size > DEVMAP_NAME_MAXLEN) {
-                free(driver);
-                ipc_answer_0(callid, EINVAL);
-                ipc_answer_0(iid, EREFUSED);
-                return;
-        }
-        
-        /*
-         * Allocate buffer for device name.
-         */
-        driver->name = (char *) malloc(name_size + 1);
-        if (driver->name == NULL) {
-                free(driver);
-                ipc_answer_0(callid, ENOMEM);
-                ipc_answer_0(iid, EREFUSED);
-                return;
-        }
-        
-        /*
-         * Send confirmation to sender and get data into buffer.
-         */
-        if (async_data_write_finalize(callid, driver->name, name_size) != EOK) {
-                free(driver->name);
-                free(driver);
-                ipc_answer_0(iid, EREFUSED);
-                return;
-        }
-        
-        driver->name[name_size] = 0;
+                ipc_answer_0(iid, rc);
+                return NULL;
+        }
         
         /* Initialize mutex for list of devices owned by this driver */
@@ -262 +415 @@
          */
         ipc_call_t call;
-        callid = async_get_call(&call);
+        ipc_callid_t callid = async_get_call(&call);
         
         if (IPC_GET_METHOD(call) != IPC_M_CONNECT_TO_ME) {
@@ -270 +423 @@
                 free(driver);
                 ipc_answer_0(iid, ENOTSUP);
-                return;
+                return NULL;
         }
         
@@ -293 +446 @@
         ipc_answer_0(iid, EOK);
         
-        *odriver = driver;
+        return driver;
 }
 
@@ -355 +508 @@
         }
         
-        /* Get device name */
-        ipc_callid_t callid;
-        size_t size;
-        if (!async_data_write_receive(&callid, &size)) {
+        /* Get fqdn */
+        char *fqdn;
+        int rc = async_data_string_receive(&fqdn, DEVMAP_NAME_MAXLEN);
+        if (rc != EOK) {
                 free(device);
-                ipc_answer_0(iid, EREFUSED);
-                return;
-        }
-        
-        if (size > DEVMAP_NAME_MAXLEN) {
+                ipc_answer_0(iid, rc);
+                return;
+        }
+        
+        char *ns_name;
+        if (!devmap_fqdn_split(fqdn, &ns_name, &device->name)) {
+                free(fqdn);
                 free(device);
-                ipc_answer_0(callid, EINVAL);
-                ipc_answer_0(iid, EREFUSED);
-                return;
-        }
-        
-        /* +1 for terminating \0 */
-        device->name = (char *) malloc(size + 1);
-        
-        if (device->name == NULL) {
+                ipc_answer_0(iid, EINVAL);
+                return;
+        }
+        
+        free(fqdn);
+        
+        fibril_mutex_lock(&devices_list_mutex);
+        
+        devmap_namespace_t *namespace = devmap_namespace_create(ns_name);
+        free(ns_name);
+        if (!namespace) {
+                fibril_mutex_unlock(&devices_list_mutex);
                 free(device);
-                ipc_answer_0(callid, ENOMEM);
-                ipc_answer_0(iid, EREFUSED);
-                return;
-        }
-        
-        async_data_write_finalize(callid, device->name, size);
-        device->name[size] = 0;
+                ipc_answer_0(iid, ENOMEM);
+                return;
+        }
         
         list_initialize(&(device->devices));
         list_initialize(&(device->driver_devices));
         
-        fibril_mutex_lock(&devices_list_mutex);
-        
-        /* Check that device with such name is not already registered */
-        if (NULL != devmap_device_find_name(device->name)) {
-                printf(NAME ": Device '%s' already registered\n", device->name);
+        /* Check that device is not already registered */
+        if (devmap_device_find_name(namespace->name, device->name) != NULL) {
+                printf(NAME ": Device '%s/%s' already registered\n", device->namespace, device->name);
+                devmap_namespace_destroy(namespace);
                 fibril_mutex_unlock(&devices_list_mutex);
+                free(device->namespace);
                 free(device->name);
                 free(device);
@@ -402 +556 @@
         device->handle = devmap_create_handle();
         
+        devmap_namespace_addref(namespace, device);
         device->driver = driver;
         
@@ -437 +592 @@
 static void devmap_forward(ipc_callid_t callid, ipc_call_t *call)
 {
+        fibril_mutex_lock(&devices_list_mutex);
+        
         /*
          * Get handle from request
@@ -450 +607 @@
         ipc_forward_fast(callid, dev->driver->phone, dev->handle,
             IPC_GET_ARG3(*call), 0, IPC_FF_NONE);
+        
+        fibril_mutex_unlock(&devices_list_mutex);
 }
 
@@ -458 +617 @@
  *
  */
-static void devmap_get_handle(ipc_callid_t iid, ipc_call_t *icall)
-{
-        /*
-         * Wait for incoming message with device name (but do not
-         * read the name itself until the buffer is allocated).
-         */
-        ipc_callid_t callid;
-        size_t size;
-        if (!async_data_write_receive(&callid, &size)) {
-                ipc_answer_0(callid, EREFUSED);
-                ipc_answer_0(iid, EREFUSED);
-                return;
-        }
-        
-        if ((size < 1) || (size > DEVMAP_NAME_MAXLEN)) {
-                ipc_answer_0(callid, EINVAL);
-                ipc_answer_0(iid, EREFUSED);
-                return;
-        }
-        
-        /*
-         * Allocate buffer for device name.
-         */
-        char *name = (char *) malloc(size + 1);
-        if (name == NULL) {
-                ipc_answer_0(callid, ENOMEM);
-                ipc_answer_0(iid, EREFUSED);
-                return;
-        }
-        
-        /*
-         * Send confirmation to sender and get data into buffer.
-         */
-        ipcarg_t retval = async_data_write_finalize(callid, name, size);
-        if (retval != EOK) {
-                ipc_answer_0(iid, EREFUSED);
-                free(name);
-                return;
-        }
-        name[size] = '\0';
+static void devmap_device_get_handle(ipc_callid_t iid, ipc_call_t *icall)
+{
+        char *fqdn;
+        
+        /* Get fqdn */
+        int rc = async_data_string_receive(&fqdn, DEVMAP_NAME_MAXLEN);
+        if (rc != EOK) {
+                ipc_answer_0(iid, rc);
+                return;
+        }
+        
+        char *ns_name;
+        char *name;
+        if (!devmap_fqdn_split(fqdn, &ns_name, &name)) {
+                free(fqdn);
+                ipc_answer_0(iid, EINVAL);
+                return;
+        }
+        
+        free(fqdn);
         
         fibril_mutex_lock(&devices_list_mutex);
         const devmap_device_t *dev;
+        
 recheck:
-
+        
         /*
          * Find device name in the list of known devices.
          */
-        dev = devmap_device_find_name(name);
+        dev = devmap_device_find_name(ns_name, name);
         
         /*
@@ -520 +660 @@
                 
                 ipc_answer_0(iid, ENOENT);
+                free(ns_name);
                 free(name);
                 fibril_mutex_unlock(&devices_list_mutex);
@@ -527 +668 @@
         
         ipc_answer_1(iid, EOK, dev->handle);
+        free(ns_name);
         free(name);
 }
 
-/** Find name of device identified by id and send it to caller.
- *
- */
-static void devmap_get_name(ipc_callid_t iid, ipc_call_t *icall)
-{
-        const devmap_device_t *device = devmap_device_find_handle(IPC_GET_ARG1(*icall));
+/** Find handle for namespace identified by name.
+ *
+ * In answer will be send EOK and device handle in arg1 or a error
+ * code from errno.h.
+ *
+ */
+static void devmap_namespace_get_handle(ipc_callid_t iid, ipc_call_t *icall)
+{
+        char *name;
+        
+        /* Get device name */
+        int rc = async_data_string_receive(&name, DEVMAP_NAME_MAXLEN);
+        if (rc != EOK) {
+                ipc_answer_0(iid, rc);
+                return;
+        }
+        
+        fibril_mutex_lock(&devices_list_mutex);
+        const devmap_namespace_t *namespace;
+        
+recheck:
         
         /*
-         * Device not found.
+         * Find namespace name in the list of known namespaces.
          */
-        if (device == NULL) {
+        namespace = devmap_namespace_find_name(name);
+        
+        /*
+         * Namespace was not found.
+         */
+        if (namespace == NULL) {
+                if (IPC_GET_ARG1(*icall) & IPC_FLAG_BLOCKING) {
+                        /* Blocking lookup */
+                        fibril_condvar_wait(&devices_list_cv,
+                            &devices_list_mutex);
+                        goto recheck;
+                }
+                
                 ipc_answer_0(iid, ENOENT);
-                return;
-        }
-        
-        ipc_answer_0(iid, EOK);
-        
-        /* FIXME:
-         * We have no channel from DEVMAP to client, therefore
-         * sending must be initiated by client.
-         *
-         * size_t name_size = str_size(device->name);
-         *
-         * int rc = async_data_write_send(phone, device->name, name_size);
-         * if (rc != EOK) {
-         *     async_wait_for(req, NULL);
-         *     return rc;
-         * }
-         */
-        
-        /* TODO: send name in response */
-}
-
-static void devmap_get_count(ipc_callid_t iid, ipc_call_t *icall)
+                free(name);
+                fibril_mutex_unlock(&devices_list_mutex);
+                return;
+        }
+        fibril_mutex_unlock(&devices_list_mutex);
+        
+        ipc_answer_1(iid, EOK, namespace->handle);
+        free(name);
+}
+
+static void devmap_handle_probe(ipc_callid_t iid, ipc_call_t *icall)
 {
         fibril_mutex_lock(&devices_list_mutex);
-        ipc_answer_1(iid, EOK, list_count(&devices_list));
+        
+        devmap_namespace_t *namespace = devmap_namespace_find_handle(IPC_GET_ARG1(*icall));
+        if (namespace == NULL) {
+                devmap_device_t *dev = devmap_device_find_handle(IPC_GET_ARG1(*icall));
+                if (dev == NULL)
+                        ipc_answer_1(iid, EOK, DEV_HANDLE_NONE);
+                else
+                        ipc_answer_1(iid, EOK, DEV_HANDLE_DEVICE);
+        } else
+                ipc_answer_1(iid, EOK, DEV_HANDLE_NAMESPACE);
+        
         fibril_mutex_unlock(&devices_list_mutex);
 }
 
-static void devmap_get_devices(ipc_callid_t iid, ipc_call_t *icall)
+static void devmap_get_namespace_count(ipc_callid_t iid, ipc_call_t *icall)
 {
         fibril_mutex_lock(&devices_list_mutex);
-        
+        ipc_answer_1(iid, EOK, list_count(&namespaces_list));
+        fibril_mutex_unlock(&devices_list_mutex);
+}
+
+static void devmap_get_device_count(ipc_callid_t iid, ipc_call_t *icall)
+{
+        fibril_mutex_lock(&devices_list_mutex);
+        
+        devmap_namespace_t *namespace = devmap_namespace_find_handle(IPC_GET_ARG1(*icall));
+        if (namespace == NULL)
+                ipc_answer_0(iid, EEXISTS);
+        else
+                ipc_answer_1(iid, EOK, namespace->refcnt);
+        
+        fibril_mutex_unlock(&devices_list_mutex);
+}
+
+static void devmap_get_namespaces(ipc_callid_t iid, ipc_call_t *icall)
+{
         ipc_callid_t callid;
         size_t size;
@@ -584 +770 @@
         if ((size % sizeof(dev_desc_t)) != 0) {
                 ipc_answer_0(callid, EINVAL);
+                ipc_answer_0(iid, EINVAL);
+                return;
+        }
+        
+        fibril_mutex_lock(&devices_list_mutex);
+        
+        size_t count = size / sizeof(dev_desc_t);
+        if (count != list_count(&namespaces_list)) {
+                ipc_answer_0(callid, EOVERFLOW);
+                ipc_answer_0(iid, EOVERFLOW);
+                return;
+        }
+        
+        dev_desc_t *desc = (dev_desc_t *) malloc(size);
+        if (desc == NULL) {
+                ipc_answer_0(callid, ENOMEM);
+                ipc_answer_0(iid, ENOMEM);
+                return;
+        }
+        
+        link_t *item = namespaces_list.next;
+        size_t pos = 0;
+        while (item != &namespaces_list) {
+                devmap_namespace_t *namespace = list_get_instance(item, devmap_namespace_t, namespaces);
+                
+                desc[pos].handle = namespace->handle;
+                str_cpy(desc[pos].name, DEVMAP_NAME_MAXLEN, namespace->name);
+                pos++;
+                
+                item = item->next;
+        }
+        
+        ipcarg_t retval = async_data_read_finalize(callid, desc, size);
+        
+        free(desc);
+        fibril_mutex_unlock(&devices_list_mutex);
+        
+        ipc_answer_0(iid, retval);
+}
+
+static void devmap_get_devices(ipc_callid_t iid, ipc_call_t *icall)
+{
+        /* FIXME: Use faster algorithm which can make better use
+           of namespaces */
+        
+        ipc_callid_t callid;
+        size_t size;
+        if (!async_data_read_receive(&callid, &size)) {
+                ipc_answer_0(callid, EREFUSED);
                 ipc_answer_0(iid, EREFUSED);
                 return;
         }
         
+        if ((size % sizeof(dev_desc_t)) != 0) {
+                ipc_answer_0(callid, EINVAL);
+                ipc_answer_0(iid, EINVAL);
+                return;
+        }
+        
+        fibril_mutex_lock(&devices_list_mutex);
+        
+        devmap_namespace_t *namespace = devmap_namespace_find_handle(IPC_GET_ARG1(*icall));
+        if (namespace == NULL) {
+                fibril_mutex_unlock(&devices_list_mutex);
+                ipc_answer_0(callid, ENOENT);
+                ipc_answer_0(iid, ENOENT);
+                return;
+        }
+        
         size_t count = size / sizeof(dev_desc_t);
+        if (count != namespace->refcnt) {
+                ipc_answer_0(callid, EOVERFLOW);
+                ipc_answer_0(iid, EOVERFLOW);
+                return;
+        }
+        
         dev_desc_t *desc = (dev_desc_t *) malloc(size);
         if (desc == NULL) {
@@ -596 +853 @@
         }
         
+        link_t *item = devices_list.next;
         size_t pos = 0;
-        link_t *item = devices_list.next;
-        
-        while ((item != &devices_list) && (pos < count)) {
+        while (item != &devices_list) {
                 devmap_device_t *device = list_get_instance(item, devmap_device_t, devices);
                 
-                desc[pos].handle = device->handle;
-                str_cpy(desc[pos].name, DEVMAP_NAME_MAXLEN, device->name);
-                pos++;
+                if (device->namespace == namespace) {
+                        desc[pos].handle = device->handle;
+                        str_cpy(desc[pos].name, DEVMAP_NAME_MAXLEN, device->name);
+                        pos++;
+                }
+                
                 item = item->next;
         }
         
-        ipcarg_t retval = async_data_read_finalize(callid, desc, pos * sizeof(dev_desc_t));
-        if (retval != EOK) {
-                ipc_answer_0(iid, EREFUSED);
-                free(desc);
-                return;
-        }
+        ipcarg_t retval = async_data_read_finalize(callid, desc, size);
         
         free(desc);
-        
         fibril_mutex_unlock(&devices_list_mutex);
         
-        ipc_answer_1(iid, EOK, pos);
+        ipc_answer_0(iid, retval);
 }
 
@@ -642 +895 @@
         }
         
-        /* Create NULL device entry */
+        char null[DEVMAP_NAME_MAXLEN];
+        snprintf(null, DEVMAP_NAME_MAXLEN, "%u", i);
+        
+        char *dev_name = str_dup(null);
+        if (dev_name == NULL) {
+                fibril_mutex_unlock(&null_devices_mutex);
+                ipc_answer_0(iid, ENOMEM);
+                return;
+        }
+        
         devmap_device_t *device = (devmap_device_t *) malloc(sizeof(devmap_device_t));
         if (device == NULL) {
@@ -650 +912 @@
         }
         
-        char null[DEVMAP_NAME_MAXLEN];
-        snprintf(null, DEVMAP_NAME_MAXLEN, "null%u", i);
-        
-        device->name = str_dup(null);
-        if (device->name == NULL) {
+        fibril_mutex_lock(&devices_list_mutex);
+        
+        devmap_namespace_t *namespace = devmap_namespace_create("null");
+        if (!namespace) {
+                fibril_mutex_lock(&devices_list_mutex);
                 fibril_mutex_unlock(&null_devices_mutex);
-                free(device);
                 ipc_answer_0(iid, ENOMEM);
                 return;
@@ -663 +924 @@
         list_initialize(&(device->devices));
         list_initialize(&(device->driver_devices));
-        
-        fibril_mutex_lock(&devices_list_mutex);
         
         /* Get unique device handle */
         device->handle = devmap_create_handle();
         device->driver = NULL;
+        
+        devmap_namespace_addref(namespace, device);
+        device->name = dev_name;
         
         /* Insert device into list of all devices
@@ -692 +954 @@
         }
         
+        fibril_mutex_lock(&devices_list_mutex);
         devmap_device_unregister_core(null_devices[i]);
+        fibril_mutex_unlock(&devices_list_mutex);
+        
         null_devices[i] = NULL;
         
@@ -725 +990 @@
         ipc_answer_0(iid, EOK);
         
-        devmap_driver_t *driver = NULL;
-        devmap_driver_register(&driver);
-        
-        if (NULL == driver)
+        devmap_driver_t *driver = devmap_driver_register();
+        if (driver == NULL)
                 return;
         
@@ -755 +1018 @@
                         break;
                 case DEVMAP_DEVICE_GET_HANDLE:
-                        devmap_get_handle(callid, &call);
-                        break;
-                case DEVMAP_DEVICE_GET_NAME:
-                        devmap_get_name(callid, &call);
+                        devmap_device_get_handle(callid, &call);
+                        break;
+                case DEVMAP_NAMESPACE_GET_HANDLE:
+                        devmap_namespace_get_handle(callid, &call);
                         break;
                 default:
@@ -793 +1056 @@
                         continue;
                 case DEVMAP_DEVICE_GET_HANDLE:
-                        devmap_get_handle(callid, &call);
-                        break;
-                case DEVMAP_DEVICE_GET_NAME:
-                        devmap_get_name(callid, &call);
-                        break;
-                case DEVMAP_DEVICE_NULL_CREATE:
+                        devmap_device_get_handle(callid, &call);
+                        break;
+                case DEVMAP_NAMESPACE_GET_HANDLE:
+                        devmap_namespace_get_handle(callid, &call);
+                        break;
+                case DEVMAP_HANDLE_PROBE:
+                        devmap_handle_probe(callid, &call);
+                        break;
+                case DEVMAP_NULL_CREATE:
                         devmap_null_create(callid, &call);
                         break;
-                case DEVMAP_DEVICE_NULL_DESTROY:
+                case DEVMAP_NULL_DESTROY:
                         devmap_null_destroy(callid, &call);
                         break;
-                case DEVMAP_DEVICE_GET_COUNT:
-                        devmap_get_count(callid, &call);
-                        break;
-                case DEVMAP_DEVICE_GET_DEVICES:
+                case DEVMAP_GET_NAMESPACE_COUNT:
+                        devmap_get_namespace_count(callid, &call);
+                        break;
+                case DEVMAP_GET_DEVICE_COUNT:
+                        devmap_get_device_count(callid, &call);
+                        break;
+                case DEVMAP_GET_NAMESPACES:
+                        devmap_get_namespaces(callid, &call);
+                        break;
+                case DEVMAP_GET_DEVICES:
                         devmap_get_devices(callid, &call);
                         break;

uspace/srv/fs/devfs/devfs_ops.c

@@ -44 +44 @@
 #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);
 }
 

uspace/srv/fs/fat/fat_ops.c

@@ -71 +71 @@
 static int fat_match(fs_node_t **, fs_node_t *, const char *);
 static int fat_node_get(fs_node_t **, dev_handle_t, fs_index_t);
+static int fat_node_open(fs_node_t *);
 static int fat_node_put(fs_node_t *);
 static int fat_create_node(fs_node_t **, dev_handle_t, int);
@@ -83 +84 @@
 static bool fat_is_directory(fs_node_t *);
 static bool fat_is_file(fs_node_t *node);
+static dev_handle_t fat_device_get(fs_node_t *node);
 
 /*
@@ -407 +409 @@
 }
 
+int fat_node_open(fs_node_t *fn)
+{
+        /*
+         * Opening a file is stateless, nothing
+         * to be done here.
+         */
+        return EOK;
+}
+
 int fat_node_put(fs_node_t *fn)
 {
@@ -867 +878 @@
 }
 
+dev_handle_t fat_device_get(fs_node_t *node)
+{
+        return 0;
+}
+
 /** libfs operations */
 libfs_ops_t fat_libfs_ops = {
@@ -872 +888 @@
         .match = fat_match,
         .node_get = fat_node_get,
+        .node_open = fat_node_open,
         .node_put = fat_node_put,
         .create = fat_create_node,
@@ -881 +898 @@
         .size_get = fat_size_get,
         .lnkcnt_get = fat_lnkcnt_get,
-        .plb_get_char = fat_plb_get_char,
+        .plb_get_char = fat_plb_get_char,
         .is_directory = fat_is_directory,
-        .is_file = fat_is_file
+        .is_file = fat_is_file,
+        .device_get = fat_device_get
 };
 

uspace/srv/fs/tmpfs/tmpfs_ops.c

@@ -69 +69 @@
 static int tmpfs_match(fs_node_t **, fs_node_t *, const char *);
 static int tmpfs_node_get(fs_node_t **, dev_handle_t, fs_index_t);
+static int tmpfs_node_open(fs_node_t *);
 static int tmpfs_node_put(fs_node_t *);
 static int tmpfs_create_node(fs_node_t **, dev_handle_t, int);
@@ -117 +118 @@
 }
 
+static dev_handle_t tmpfs_device_get(fs_node_t *fn)
+{
+        return 0;
+}
+
 /** libfs operations */
 libfs_ops_t tmpfs_libfs_ops = {
@@ -122 +128 @@
         .match = tmpfs_match,
         .node_get = tmpfs_node_get,
+        .node_open = tmpfs_node_open,
         .node_put = tmpfs_node_put,
         .create = tmpfs_create_node,
@@ -133 +140 @@
         .plb_get_char = tmpfs_plb_get_char,
         .is_directory = tmpfs_is_directory,
-        .is_file = tmpfs_is_file
+        .is_file = tmpfs_is_file,
+        .device_get = tmpfs_device_get
 };
 
@@ -241 +249 @@
         }
         return EOK;     
+}
+
+int tmpfs_node_open(fs_node_t *fn)
+{
+        /* nothing to do */
+        return EOK;
 }