WebSVN – HelenOS – Diff – /branches/dynload/uspace/srv/vfs/vfs.c


/*
 * Copyright (c) 2008 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/** @addtogroup fs
 * @{
 */
 
/**
 * @file vfs.c
 * @brief VFS service for HelenOS.
 */
 
#include <ipc/ipc.h>
#include <ipc/services.h>
#include <async.h>
#include <errno.h>
#include <stdio.h>
#include <bool.h>
#include <string.h>
#include <as.h>
#include <libadt/list.h>
#include <atomic.h>
#include "vfs.h"
 
#define NAME "vfs"
 
static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall)
{
    bool keep_on_going = true;
   
    /*
     * The connection was opened via the IPC_CONNECT_ME_TO call.
     * This call needs to be answered.
     */
    ipc_answer_0(iid, EOK);
   
    /*
     * Here we enter the main connection fibril loop.
     * The logic behind this loop and the protocol is that we'd like to keep
     * each connection open until the client hangs up. When the client hangs
     * up, we will free its VFS state. The act of hanging up the connection
     * by the client is equivalent to client termination because we cannot
     * distinguish one from the other. On the other hand, the client can
     * hang up arbitrarily if it has no open files and reestablish the
     * connection later.
     */
    while (keep_on_going) {
 
        ipc_call_t call;
        ipc_callid_t callid = async_get_call(&call);
       
        fs_handle_t fs_handle;
 
        int phone;
       
        switch (IPC_GET_METHOD(call)) {
        case IPC_M_PHONE_HUNGUP:
            keep_on_going = false;
            break;
        case IPC_M_CONNECT_ME_TO:
            /*
             * Connect the client file system to another one.
             */
            /* FIXME:
             * Prevent ordinary clients from connecting to file
             * system servers directly. This should be solved by
             * applying some security mechanisms.
             */
            fs_handle = IPC_GET_ARG1(call);
            phone = vfs_grab_phone(fs_handle);
            (void) ipc_forward_fast(callid, phone, 0, 0, 0,
                IPC_FF_NONE);
            vfs_release_phone(phone);
            break;
        case VFS_REGISTER:
            vfs_register(callid, &call);
            /*
             * Keep the connection open so that a file system can
             * later ask us to connect it to another file system.
             * This is necessary to support non-root mounts.
             */
            break;
        case VFS_MOUNT:
            vfs_mount(callid, &call);
            break;
        case VFS_OPEN:
            vfs_open(callid, &call);
            break;
        case VFS_CLOSE:
            vfs_close(callid, &call);
            break;
        case VFS_READ:
            vfs_read(callid, &call);
            break;
        case VFS_WRITE:
            vfs_write(callid, &call);
            break;
        case VFS_SEEK:
            vfs_seek(callid, &call);
            break;
        case VFS_TRUNCATE:
            vfs_truncate(callid, &call);
            break;
        case VFS_MKDIR:
            vfs_mkdir(callid, &call);
            break;
        case VFS_UNLINK:
            vfs_unlink(callid, &call);
            break;
        case VFS_RENAME:
            vfs_rename(callid, &call);
            break;
        default:
            ipc_answer_0(callid, ENOTSUP);
            break;
        }
    }
 
 
   
    /* TODO: cleanup after the client */
}
 
int main(int argc, char **argv)
{
 
 
    printf(NAME ": HelenOS VFS server\n");
   
    /*
     * Initialize the list of registered file systems.
     */
    list_initialize(&fs_head);
   
    /*
     * Initialize VFS node hash table.
     */
    if (!vfs_nodes_init()) {
        printf(NAME ": Failed to initialize VFS node hash table\n");
        return ENOMEM;
    }
   
    /*
     * Allocate and initialize the Path Lookup Buffer.
     */
    list_initialize(&plb_head);
    plb = as_get_mappable_page(PLB_SIZE);
    if (!plb) {
        printf(NAME ": Cannot allocate a mappable piece of address space\n");
        return ENOMEM;
    }
   
    if (as_area_create(plb, PLB_SIZE, AS_AREA_READ | AS_AREA_WRITE |
        AS_AREA_CACHEABLE) != plb) {
        printf(NAME ": Cannot create address space area\n");
        return ENOMEM;
    }
    memset(plb, 0, PLB_SIZE);
   
    /*
     * Set a connectio handling function/fibril.
     */
    async_set_client_connection(vfs_connection);
   
    /*
     * Register at the naming service.
     */
    ipcarg_t phonead;
    ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead);
   
    /*
     * Start accepting connections.
     */
    printf(NAME ": Accepting connections\n");
    async_manager();
    return 0;
}
 
/**
 * @}
 */
 

Rev 4341	Rev 4345
1	/*	1	/*
2	* Copyright (c) 2008 Jakub Jermar	2	* Copyright (c) 2008 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup fs	29	/** @addtogroup fs
30	* @{	30	* @{
31	*/	31	*/
32		32
33	/**	33	/**
34	* @file vfs.c	34	* @file vfs.c
35	* @brief VFS service for HelenOS.	35	* @brief VFS service for HelenOS.
36	*/	36	*/
37		37
38	#include <ipc/ipc.h>	38	#include <ipc/ipc.h>
39	#include <ipc/services.h>	39	#include <ipc/services.h>
40	#include <async.h>	40	#include <async.h>
41	#include <errno.h>	41	#include <errno.h>
42	#include <stdio.h>	42	#include <stdio.h>
43	#include <bool.h>	43	#include <bool.h>
44	#include <string.h>	44	#include <string.h>
45	#include <as.h>	45	#include <as.h>
46	#include <libadt/list.h>	46	#include <libadt/list.h>
47	#include <atomic.h>	47	#include <atomic.h>
48	#include "vfs.h"	48	#include "vfs.h"
49		49
50	#define NAME "vfs"	50	#define NAME "vfs"
51		51
52	static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall)	52	static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall)
53	{	53	{
54	bool keep_on_going = 1;	54	bool keep_on_going = true;
55		55
56	/*	56	/*
57	* The connection was opened via the IPC_CONNECT_ME_TO call.	57	* The connection was opened via the IPC_CONNECT_ME_TO call.
58	* This call needs to be answered.	58	* This call needs to be answered.
59	*/	59	*/
60	ipc_answer_0(iid, EOK);	60	ipc_answer_0(iid, EOK);
61		61
62	/*	62	/*
63	* Here we enter the main connection fibril loop.	63	* Here we enter the main connection fibril loop.
64	* The logic behind this loop and the protocol is that we'd like to keep	64	* The logic behind this loop and the protocol is that we'd like to keep
65	* each connection open until the client hangs up. When the client hangs	65	* each connection open until the client hangs up. When the client hangs
66	* up, we will free its VFS state. The act of hanging up the connection	66	* up, we will free its VFS state. The act of hanging up the connection
67	* by the client is equivalent to client termination because we cannot	67	* by the client is equivalent to client termination because we cannot
68	* distinguish one from the other. On the other hand, the client can	68	* distinguish one from the other. On the other hand, the client can
69	* hang up arbitrarily if it has no open files and reestablish the	69	* hang up arbitrarily if it has no open files and reestablish the
70	* connection later.	70	* connection later.
71	*/	71	*/
72	while (keep_on_going) {	72	while (keep_on_going) {
73	ipc_callid_t callid;	-
74	ipc_call_t call;	73	ipc_call_t call;
-		74	ipc_callid_t callid = async_get_call(&call);
75	int phone;	75
76	fs_handle_t fs_handle;	76	fs_handle_t fs_handle;
77		-
78	callid = async_get_call(&call);	77	int phone;
79		78
80	switch (IPC_GET_METHOD(call)) {	79	switch (IPC_GET_METHOD(call)) {
81	case IPC_M_PHONE_HUNGUP:	80	case IPC_M_PHONE_HUNGUP:
82	keep_on_going = false;	81	keep_on_going = false;
83	break;	82	break;
84	case IPC_M_CONNECT_ME_TO:	83	case IPC_M_CONNECT_ME_TO:
85	/*	84	/*
86	* Connect the client file system to another one.	85	* Connect the client file system to another one.
87	*/	86	*/
88	/* FIXME:	87	/* FIXME:
89	* Prevent ordinary clients from connecting to file	88	* Prevent ordinary clients from connecting to file
90	* system servers directly. This should be solved by	89	* system servers directly. This should be solved by
91	* applying some security mechanisms.	90	* applying some security mechanisms.
92	*/	91	*/
93	fs_handle = IPC_GET_ARG1(call);	92	fs_handle = IPC_GET_ARG1(call);
94	phone = vfs_grab_phone(fs_handle);	93	phone = vfs_grab_phone(fs_handle);
95	(void) ipc_forward_fast(callid, phone, 0, 0, 0,	94	(void) ipc_forward_fast(callid, phone, 0, 0, 0,
96	IPC_FF_NONE);	95	IPC_FF_NONE);
97	vfs_release_phone(phone);	96	vfs_release_phone(phone);
98	break;	97	break;
99	case VFS_REGISTER:	98	case VFS_REGISTER:
100	vfs_register(callid, &call);	99	vfs_register(callid, &call);
101	/*	100	/*
102	* Keep the connection open so that a file system can	101	* Keep the connection open so that a file system can
103	* later ask us to connect it to another file system.	102	* later ask us to connect it to another file system.
104	* This is necessary to support non-root mounts.	103	* This is necessary to support non-root mounts.
105	*/	104	*/
106	break;	105	break;
107	case VFS_MOUNT:	106	case VFS_MOUNT:
108	vfs_mount(callid, &call);	107	vfs_mount(callid, &call);
109	break;	108	break;
110	case VFS_OPEN:	109	case VFS_OPEN:
111	vfs_open(callid, &call);	110	vfs_open(callid, &call);
112	break;	111	break;
113	case VFS_CLOSE:	112	case VFS_CLOSE:
114	vfs_close(callid, &call);	113	vfs_close(callid, &call);
115	break;	114	break;
116	case VFS_READ:	115	case VFS_READ:
117	vfs_read(callid, &call);	116	vfs_read(callid, &call);
118	break;	117	break;
119	case VFS_WRITE:	118	case VFS_WRITE:
120	vfs_write(callid, &call);	119	vfs_write(callid, &call);
121	break;	120	break;
122	case VFS_SEEK:	121	case VFS_SEEK:
123	vfs_seek(callid, &call);	122	vfs_seek(callid, &call);
124	break;	123	break;
125	case VFS_TRUNCATE:	124	case VFS_TRUNCATE:
126	vfs_truncate(callid, &call);	125	vfs_truncate(callid, &call);
127	break;	126	break;
128	case VFS_MKDIR:	127	case VFS_MKDIR:
129	vfs_mkdir(callid, &call);	128	vfs_mkdir(callid, &call);
130	break;	129	break;
131	case VFS_UNLINK:	130	case VFS_UNLINK:
132	vfs_unlink(callid, &call);	131	vfs_unlink(callid, &call);
133	break;	132	break;
134	case VFS_RENAME:	133	case VFS_RENAME:
135	vfs_rename(callid, &call);	134	vfs_rename(callid, &call);
136	break;	135	break;
137	default:	136	default:
138	ipc_answer_0(callid, ENOTSUP);	137	ipc_answer_0(callid, ENOTSUP);
139	break;	138	break;
140	}	139	}
141	}	140	}
142		-
143	/* TODO: cleanup after the client */	-
144		141
-		142	/* TODO: cleanup after the client */
145	}	143	}
146		144
147	int main(int argc, char **argv)	145	int main(int argc, char **argv)
148	{	146	{
149	ipcarg_t phonead;	-
150		-
151	printf(NAME ": HelenOS VFS server\n");	147	printf(NAME ": HelenOS VFS server\n");
152		148
153	/*	149	/*
154	* Initialize the list of registered file systems.	150	* Initialize the list of registered file systems.
155	*/	151	*/
156	list_initialize(&fs_head);	152	list_initialize(&fs_head);
157		153
158	/*	154	/*
159	* Initialize VFS node hash table.	155	* Initialize VFS node hash table.
160	*/	156	*/
161	if (!vfs_nodes_init()) {	157	if (!vfs_nodes_init()) {
162	printf(NAME ": Failed to initialize VFS node hash table\n");	158	printf(NAME ": Failed to initialize VFS node hash table\n");
163	return ENOMEM;	159	return ENOMEM;
164	}	160	}
165		161
166	/*	162	/*
167	* Allocate and initialize the Path Lookup Buffer.	163	* Allocate and initialize the Path Lookup Buffer.
168	*/	164	*/
169	list_initialize(&plb_head);	165	list_initialize(&plb_head);
170	plb = as_get_mappable_page(PLB_SIZE);	166	plb = as_get_mappable_page(PLB_SIZE);
171	if (!plb) {	167	if (!plb) {
172	printf(NAME ": Cannot allocate a mappable piece of address space\n");	168	printf(NAME ": Cannot allocate a mappable piece of address space\n");
173	return ENOMEM;	169	return ENOMEM;
174	}	170	}
-		171
175	if (as_area_create(plb, PLB_SIZE, AS_AREA_READ \| AS_AREA_WRITE \|	172	if (as_area_create(plb, PLB_SIZE, AS_AREA_READ \| AS_AREA_WRITE \|
176	AS_AREA_CACHEABLE) != plb) {	173	AS_AREA_CACHEABLE) != plb) {
177	printf(NAME ": Cannot create address space area\n");	174	printf(NAME ": Cannot create address space area\n");
178	return ENOMEM;	175	return ENOMEM;
179	}	176	}
180	memset(plb, 0, PLB_SIZE);	177	memset(plb, 0, PLB_SIZE);
181		178
182	/*	179	/*
183	* Set a connectio handling function/fibril.	180	* Set a connectio handling function/fibril.
184	*/	181	*/
185	async_set_client_connection(vfs_connection);	182	async_set_client_connection(vfs_connection);
186		183
187	/*	184	/*
188	* Register at the naming service.	185	* Register at the naming service.
189	*/	186	*/
-		187	ipcarg_t phonead;
190	ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead);	188	ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead);
191		189
192	/*	190	/*
193	* Start accepting connections.	191	* Start accepting connections.
194	*/	192	*/
195	printf(NAME ": Accepting connections\n");	193	printf(NAME ": Accepting connections\n");
196	async_manager();	194	async_manager();
197	return 0;	195	return 0;
198	}	196	}
199		197
200	/**	198	/**
201	* @}	199	* @}
202	*/	200	*/
203		201

Subversion Repositories HelenOS

(root)/branches/dynload/uspace/srv/vfs/vfs.c – Rev 4341 → 4345