WebSVN – HelenOS – Diff – /trunk/uspace/srv/vfs/vfs.c


/*
 * Copyright (c) 2007 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 dprintf(...)    printf(__VA_ARGS__)
 
static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall)
{
    bool keep_on_going = 1;
 
    printf("Connection opened from %p\n", icall->in_phone_hash);
 
    /*
     * 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_callid_t callid;
        ipc_call_t call;
 
        callid = async_get_call(&call);
 
        printf("Received call, method=%d\n", IPC_GET_METHOD(call));
       
        switch (IPC_GET_METHOD(call)) {
        case IPC_M_PHONE_HUNGUP:
            keep_on_going = false;
            break;
        case VFS_REGISTER:
            vfs_register(callid, &call);
            keep_on_going = false;
            break;
        case VFS_MOUNT:
            vfs_mount(callid, &call);
            keep_on_going = false;
            break;
        case VFS_OPEN:
            vfs_open(callid, &call);
            break;
        case VFS_READ:
            vfs_read(callid, &call);
            break;
        case VFS_UNMOUNT:
        case VFS_CREATE:
        case VFS_CLOSE:
        case VFS_WRITE:
        case VFS_SEEK:
        case VFS_UNLINK:
        case VFS_RENAME:
        default:
            ipc_answer_0(callid, ENOTSUP);
            break;
        }
    }
 
    /* TODO: cleanup after the client */
   
}
 
int main(int argc, char **argv)
{
    ipcarg_t phonead;
 
    printf("VFS: 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("Failed to initialize the 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("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("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.
     */
    ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead);
 
    /*
     * Start accepting connections.
     */
    async_manager();
    return 0;
}
 
/**
 * @}
 */
 

Rev 2625	Rev 2637
1	/*	1	/*
2	* Copyright (c) 2007 Jakub Jermar	2	* Copyright (c) 2007 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 dprintf(...) printf(__VA_ARGS__)	50	#define dprintf(...) printf(__VA_ARGS__)
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 = 1;
55		55
56	printf("Connection opened from %p\n", icall->in_phone_hash);	56	printf("Connection opened from %p\n", icall->in_phone_hash);
57		57
58	/*	58	/*
59	* The connection was opened via the IPC_CONNECT_ME_TO call.	59	* The connection was opened via the IPC_CONNECT_ME_TO call.
60	* This call needs to be answered.	60	* This call needs to be answered.
61	*/	61	*/
62	ipc_answer_0(iid, EOK);	62	ipc_answer_0(iid, EOK);
63		63
64	/*	64	/*
65	* Here we enter the main connection fibril loop.	65	* Here we enter the main connection fibril loop.
66	* The logic behind this loop and the protocol is that we'd like to keep	66	* The logic behind this loop and the protocol is that we'd like to keep
67	* each connection open until the client hangs up. When the client hangs	67	* each connection open until the client hangs up. When the client hangs
68	* up, we will free its VFS state. The act of hanging up the connection	68	* up, we will free its VFS state. The act of hanging up the connection
69	* by the client is equivalent to client termination because we cannot	69	* by the client is equivalent to client termination because we cannot
70	* distinguish one from the other. On the other hand, the client can	70	* distinguish one from the other. On the other hand, the client can
71	* hang up arbitrarily if it has no open files and reestablish the	71	* hang up arbitrarily if it has no open files and reestablish the
72	* connection later.	72	* connection later.
73	*/	73	*/
74	while (keep_on_going) {	74	while (keep_on_going) {
75	ipc_callid_t callid;	75	ipc_callid_t callid;
76	ipc_call_t call;	76	ipc_call_t call;
77		77
78	callid = async_get_call(&call);	78	callid = async_get_call(&call);
79		79
80	printf("Received call, method=%d\n", IPC_GET_METHOD(call));	80	printf("Received call, method=%d\n", IPC_GET_METHOD(call));
81		81
82	switch (IPC_GET_METHOD(call)) {	82	switch (IPC_GET_METHOD(call)) {
83	case IPC_M_PHONE_HUNGUP:	83	case IPC_M_PHONE_HUNGUP:
84	keep_on_going = false;	84	keep_on_going = false;
85	break;	85	break;
86	case VFS_REGISTER:	86	case VFS_REGISTER:
87	vfs_register(callid, &call);	87	vfs_register(callid, &call);
88	keep_on_going = false;	88	keep_on_going = false;
89	break;	89	break;
90	case VFS_MOUNT:	90	case VFS_MOUNT:
91	vfs_mount(callid, &call);	91	vfs_mount(callid, &call);
92	keep_on_going = false;	92	keep_on_going = false;
93	break;	93	break;
94	case VFS_OPEN:	94	case VFS_OPEN:
95	vfs_open(callid, &call);	95	vfs_open(callid, &call);
96	break;	96	break;
97	case VFS_READ:	97	case VFS_READ:
98	vfs_read(callid, &call);	98	vfs_read(callid, &call);
99	break;	99	break;
100	case VFS_UNMOUNT:	100	case VFS_UNMOUNT:
101	case VFS_CREATE:	101	case VFS_CREATE:
102	case VFS_CLOSE:	102	case VFS_CLOSE:
103	case VFS_WRITE:	103	case VFS_WRITE:
104	case VFS_SEEK:	104	case VFS_SEEK:
105	case VFS_UNLINK:	105	case VFS_UNLINK:
106	case VFS_RENAME:	106	case VFS_RENAME:
107	default:	107	default:
108	ipc_answer_0(callid, ENOTSUP);	108	ipc_answer_0(callid, ENOTSUP);
109	break;	109	break;
110	}	110	}
111	}	111	}
112		112
113	/* TODO: cleanup after the client */	113	/* TODO: cleanup after the client */
114		114
115	}	115	}
116		116
117	int main(int argc, char **argv)	117	int main(int argc, char **argv)
118	{	118	{
119	ipcarg_t phonead;	119	ipcarg_t phonead;
120		120
121	printf("VFS: HelenOS VFS server\n");	121	printf("VFS: HelenOS VFS server\n");
122		122
123	/*	123	/*
124	* Initialize the list of registered file systems.	124	* Initialize the list of registered file systems.
125	*/	125	*/
126	list_initialize(&fs_head);	126	list_initialize(&fs_head);
127		127
128	/*	128	/*
129	* Initialize VFS node hash table.	129	* Initialize VFS node hash table.
130	*/	130	*/
131	if (!vfs_nodes_init()) {	131	if (!vfs_nodes_init()) {
132	printf("Failed to initialize the VFS node hash table.\n");	132	printf("Failed to initialize the VFS node hash table.\n");
133	return ENOMEM;	133	return ENOMEM;
134	}	134	}
135		135
136	/*	136	/*
137	* Allocate and initialize the Path Lookup Buffer.	137	* Allocate and initialize the Path Lookup Buffer.
138	*/	138	*/
139	list_initialize(&plb_head);	139	list_initialize(&plb_head);
140	plb = as_get_mappable_page(PLB_SIZE);	140	plb = as_get_mappable_page(PLB_SIZE);
141	if (!plb) {	141	if (!plb) {
142	printf("Cannot allocate a mappable piece of address space\n");	142	printf("Cannot allocate a mappable piece of address space\n");
143	return ENOMEM;	143	return ENOMEM;
144	}	144	}
145	if (as_area_create(plb, PLB_SIZE, AS_AREA_READ \| AS_AREA_WRITE \|	145	if (as_area_create(plb, PLB_SIZE, AS_AREA_READ \| AS_AREA_WRITE \|
146	AS_AREA_CACHEABLE) != plb) {	146	AS_AREA_CACHEABLE) != plb) {
147	printf("Cannot create address space area.\n");	147	printf("Cannot create address space area.\n");
148	return ENOMEM;	148	return ENOMEM;
149	}	149	}
150	memset(plb, 0, PLB_SIZE);	150	memset(plb, 0, PLB_SIZE);
151		151
152	/*	152	/*
153	* Set a connectio handling function/fibril.	153	* Set a connectio handling function/fibril.
154	*/	154	*/
155	async_set_client_connection(vfs_connection);	155	async_set_client_connection(vfs_connection);
156		156
157	/*	157	/*
158	* Register at the naming service.	158	* Register at the naming service.
159	*/	159	*/
160	ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, &phonead);	160	ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead);
161		161
162	/*	162	/*
163	* Start accepting connections.	163	* Start accepting connections.
164	*/	164	*/
165	async_manager();	165	async_manager();
166	return 0;	166	return 0;
167	}	167	}
168		168
169	/**	169	/**
170	* @}	170	* @}
171	*/	171	*/
172		172

Subversion Repositories HelenOS

(root)/trunk/uspace/srv/vfs/vfs.c @ 3849 – Rev 2625 → 2637