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);
 
    /*
     * Initialize the table of open files.
     */
    if (!vfs_conn_open_files_init()) {
        ipc_answer_fast(iid, ENOMEM, 0, 0);
        return;
    }
 
    /*
     * The connection was opened via the IPC_CONNECT_ME_TO call.
     * This call needs to be answered.
     */
    ipc_answer_fast(iid, EOK, 0, 0);
 
    /*
     * 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);
 
            break;
        case VFS_MOUNT:
        case VFS_UNMOUNT:
        case VFS_OPEN:
        case VFS_CREATE:
        case VFS_CLOSE:
        case VFS_READ:
        case VFS_WRITE:
        case VFS_SEEK:
        default:
            ipc_answer_fast(callid, ENOTSUP, 0, 0);
            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);
 
    /*
     * 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, &phonead);
 
    /*
     * Start accepting connections.
     */
    async_manager();
    return 0;
}
 
/**
 * @}
 */
 

Rev 2552	Rev 2560
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	* Initialize the table of open files.
-		60	*/
-		61	if (!vfs_conn_open_files_init()) {
-		62	ipc_answer_fast(iid, ENOMEM, 0, 0);
-		63	return;
-		64	}
-		65
-		66	/*
59	* The connection was opened via the IPC_CONNECT_ME_TO call.	67	* The connection was opened via the IPC_CONNECT_ME_TO call.
60	* This call needs to be answered.	68	* This call needs to be answered.
61	*/	69	*/
62	ipc_answer_fast(iid, EOK, 0, 0);	70	ipc_answer_fast(iid, EOK, 0, 0);
63		71
64	/*	72	/*
65	* Here we enter the main connection fibril loop.	73	* Here we enter the main connection fibril loop.
66	* The logic behind this loop and the protocol is that we'd like to keep	74	* The logic behind this loop and the protocol is that we'd like to keep
67	* each connection open for a while before we close it. The benefit of	75	* each connection open until the client hangs up. When the client hangs
68	* this is that the client doesn't have to establish a new connection	76	* up, we will free its VFS state. The act of hanging up the connection
69	* upon each request. On the other hand, the client must be ready to	77	* by the client is equivalent to client termination because we cannot
70	* re-establish a connection if we hang it up due to reaching of maximum	78	* distinguish one from the other. On the other hand, the client can
71	* number of requests per connection or due to the client timing out.	79	* hang up arbitrarily if it has no open files and reestablish the
-		80	* connection later.
72	*/	81	*/
73		-
74	while (keep_on_going) {	82	while (keep_on_going) {
75	ipc_callid_t callid;	83	ipc_callid_t callid;
76	ipc_call_t call;	84	ipc_call_t call;
77		85
78	callid = async_get_call(&call);	86	callid = async_get_call(&call);
79		87
80	printf("Received call, method=%d\n", IPC_GET_METHOD(call));	88	printf("Received call, method=%d\n", IPC_GET_METHOD(call));
81		89
82	switch (IPC_GET_METHOD(call)) {	90	switch (IPC_GET_METHOD(call)) {
83	case IPC_M_PHONE_HUNGUP:	91	case IPC_M_PHONE_HUNGUP:
84	keep_on_going = false;	92	keep_on_going = false;
85	break;	93	break;
86	case VFS_REGISTER:	94	case VFS_REGISTER:
87	vfs_register(callid, &call);	95	vfs_register(callid, &call);
88	keep_on_going = false;	-
89	break;	96	break;
90	case VFS_MOUNT:	97	case VFS_MOUNT:
91	case VFS_UNMOUNT:	98	case VFS_UNMOUNT:
92	case VFS_OPEN:	99	case VFS_OPEN:
93	case VFS_CREATE:	100	case VFS_CREATE:
94	case VFS_CLOSE:	101	case VFS_CLOSE:
95	case VFS_READ:	102	case VFS_READ:
96	case VFS_WRITE:	103	case VFS_WRITE:
97	case VFS_SEEK:	104	case VFS_SEEK:
98	default:	105	default:
99	ipc_answer_fast(callid, ENOTSUP, 0, 0);	106	ipc_answer_fast(callid, ENOTSUP, 0, 0);
100	break;	107	break;
101	}	108	}
102	}	109	}
103		110
104	/* TODO: cleanup after the client */	111	/* TODO: cleanup after the client */
105		112
106	}	113	}
107		114
108	int main(int argc, char **argv)	115	int main(int argc, char **argv)
109	{	116	{
110	ipcarg_t phonead;	117	ipcarg_t phonead;
111		118
112	printf("VFS: HelenOS VFS server\n");	119	printf("VFS: HelenOS VFS server\n");
113		120
114	/*	121	/*
115	* Initialize the list of registered file systems.	122	* Initialize the list of registered file systems.
116	*/	123	*/
117	list_initialize(&fs_head);	124	list_initialize(&fs_head);
118		125
119	/*	126	/*
120	* Allocate and initialize the Path Lookup Buffer.	127	* Allocate and initialize the Path Lookup Buffer.
121	*/	128	*/
122	list_initialize(&plb_head);	129	list_initialize(&plb_head);
123	plb = as_get_mappable_page(PLB_SIZE);	130	plb = as_get_mappable_page(PLB_SIZE);
124	if (!plb) {	131	if (!plb) {
125	printf("Cannot allocate a mappable piece of address space\n");	132	printf("Cannot allocate a mappable piece of address space\n");
126	return ENOMEM;	133	return ENOMEM;
127	}	134	}
128	if (as_area_create(plb, PLB_SIZE, AS_AREA_READ \| AS_AREA_WRITE \|	135	if (as_area_create(plb, PLB_SIZE, AS_AREA_READ \| AS_AREA_WRITE \|
129	AS_AREA_CACHEABLE) != plb) {	136	AS_AREA_CACHEABLE) != plb) {
130	printf("Cannot create address space area.\n");	137	printf("Cannot create address space area.\n");
131	return ENOMEM;	138	return ENOMEM;
132	}	139	}
133	memset(plb, 0, PLB_SIZE);	140	memset(plb, 0, PLB_SIZE);
134		141
135	/*	142	/*
136	* Set a connectio handling function/fibril.	143	* Set a connectio handling function/fibril.
137	*/	144	*/
138	async_set_client_connection(vfs_connection);	145	async_set_client_connection(vfs_connection);
139		146
140	/*	147	/*
141	* Register at the naming service.	148	* Register at the naming service.
142	*/	149	*/
143	ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, &phonead);	150	ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, &phonead);
144		151
145	/*	152	/*
146	* Start accepting connections.	153	* Start accepting connections.
147	*/	154	*/
148	async_manager();	155	async_manager();
149	return 0;	156	return 0;
150	}	157	}
151		158
152	/**	159	/**
153	* @}	160	* @}
154	*/	161	*/
155		162

Subversion Repositories HelenOS

(root)/trunk/uspace/srv/vfs/vfs.c – Rev 2552 → 2560