WebSVN – HelenOS – Diff – /trunk/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 = 1;
 
    /*
     * 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;
        int phone;
        fs_handle_t fs_handle;
 
        callid = async_get_call(&call);
 
        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)
{
    ipcarg_t phonead;
 
    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.
     */
    ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead);
 
    /*
     * Start accepting connections.
     */
    printf(NAME ": Accepting connections\n");
    async_manager();
    return 0;
}
 
/**
 * @}
 */
 

Rev 3847	Rev 3849
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 = 1;
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;	73	ipc_callid_t callid;
74	ipc_call_t call;	74	ipc_call_t call;
-		75	int phone;
-		76	fs_handle_t fs_handle;
75		77
76	callid = async_get_call(&call);	78	callid = async_get_call(&call);
77		79
78	switch (IPC_GET_METHOD(call)) {	80	switch (IPC_GET_METHOD(call)) {
79	case IPC_M_PHONE_HUNGUP:	81	case IPC_M_PHONE_HUNGUP:
80	keep_on_going = false;	82	keep_on_going = false;
81	break;	83	break;
-		84	case IPC_M_CONNECT_ME_TO:
-		85	/*
-		86	* Connect the client file system to another one.
-		87	*/
-		88	/* FIXME:
-		89	* Prevent ordinary clients from connecting to file
-		90	* system servers directly. This should be solved by
-		91	* applying some security mechanisms.
-		92	*/
-		93	fs_handle = IPC_GET_ARG1(call);
-		94	phone = vfs_grab_phone(fs_handle);
-		95	(void) ipc_forward_fast(callid, phone, 0, 0, 0,
-		96	IPC_FF_NONE);
-		97	vfs_release_phone(phone);
-		98	break;
82	case VFS_REGISTER:	99	case VFS_REGISTER:
83	vfs_register(callid, &call);	100	vfs_register(callid, &call);
84	/*	101	/*
85	* Keep the connection open so that a file system can	102	* Keep the connection open so that a file system can
86	* later ask us to connect it to another file system.	103	* later ask us to connect it to another file system.
87	* This is necessary to support non-root mounts.	104	* This is necessary to support non-root mounts.
88	*/	105	*/
89	break;	106	break;
90	case VFS_MOUNT:	107	case VFS_MOUNT:
91	vfs_mount(callid, &call);	108	vfs_mount(callid, &call);
92	break;	109	break;
93	case VFS_OPEN:	110	case VFS_OPEN:
94	vfs_open(callid, &call);	111	vfs_open(callid, &call);
95	break;	112	break;
96	case VFS_CLOSE:	113	case VFS_CLOSE:
97	vfs_close(callid, &call);	114	vfs_close(callid, &call);
98	break;	115	break;
99	case VFS_READ:	116	case VFS_READ:
100	vfs_read(callid, &call);	117	vfs_read(callid, &call);
101	break;	118	break;
102	case VFS_WRITE:	119	case VFS_WRITE:
103	vfs_write(callid, &call);	120	vfs_write(callid, &call);
104	break;	121	break;
105	case VFS_SEEK:	122	case VFS_SEEK:
106	vfs_seek(callid, &call);	123	vfs_seek(callid, &call);
107	break;	124	break;
108	case VFS_TRUNCATE:	125	case VFS_TRUNCATE:
109	vfs_truncate(callid, &call);	126	vfs_truncate(callid, &call);
110	break;	127	break;
111	case VFS_MKDIR:	128	case VFS_MKDIR:
112	vfs_mkdir(callid, &call);	129	vfs_mkdir(callid, &call);
113	break;	130	break;
114	case VFS_UNLINK:	131	case VFS_UNLINK:
115	vfs_unlink(callid, &call);	132	vfs_unlink(callid, &call);
116	break;	133	break;
117	case VFS_RENAME:	134	case VFS_RENAME:
118	vfs_rename(callid, &call);	135	vfs_rename(callid, &call);
119	break;	136	break;
120	default:	137	default:
121	ipc_answer_0(callid, ENOTSUP);	138	ipc_answer_0(callid, ENOTSUP);
122	break;	139	break;
123	}	140	}
124	}	141	}
125		142
126	/* TODO: cleanup after the client */	143	/* TODO: cleanup after the client */
127		144
128	}	145	}
129		146
130	int main(int argc, char **argv)	147	int main(int argc, char **argv)
131	{	148	{
132	ipcarg_t phonead;	149	ipcarg_t phonead;
133		150
134	printf(NAME ": HelenOS VFS server\n");	151	printf(NAME ": HelenOS VFS server\n");
135		152
136	/*	153	/*
137	* Initialize the list of registered file systems.	154	* Initialize the list of registered file systems.
138	*/	155	*/
139	list_initialize(&fs_head);	156	list_initialize(&fs_head);
140		157
141	/*	158	/*
142	* Initialize VFS node hash table.	159	* Initialize VFS node hash table.
143	*/	160	*/
144	if (!vfs_nodes_init()) {	161	if (!vfs_nodes_init()) {
145	printf(NAME ": Failed to initialize VFS node hash table\n");	162	printf(NAME ": Failed to initialize VFS node hash table\n");
146	return ENOMEM;	163	return ENOMEM;
147	}	164	}
148		165
149	/*	166	/*
150	* Allocate and initialize the Path Lookup Buffer.	167	* Allocate and initialize the Path Lookup Buffer.
151	*/	168	*/
152	list_initialize(&plb_head);	169	list_initialize(&plb_head);
153	plb = as_get_mappable_page(PLB_SIZE);	170	plb = as_get_mappable_page(PLB_SIZE);
154	if (!plb) {	171	if (!plb) {
155	printf(NAME ": Cannot allocate a mappable piece of address space\n");	172	printf(NAME ": Cannot allocate a mappable piece of address space\n");
156	return ENOMEM;	173	return ENOMEM;
157	}	174	}
158	if (as_area_create(plb, PLB_SIZE, AS_AREA_READ \| AS_AREA_WRITE \|	175	if (as_area_create(plb, PLB_SIZE, AS_AREA_READ \| AS_AREA_WRITE \|
159	AS_AREA_CACHEABLE) != plb) {	176	AS_AREA_CACHEABLE) != plb) {
160	printf(NAME ": Cannot create address space area\n");	177	printf(NAME ": Cannot create address space area\n");
161	return ENOMEM;	178	return ENOMEM;
162	}	179	}
163	memset(plb, 0, PLB_SIZE);	180	memset(plb, 0, PLB_SIZE);
164		181
165	/*	182	/*
166	* Set a connectio handling function/fibril.	183	* Set a connectio handling function/fibril.
167	*/	184	*/
168	async_set_client_connection(vfs_connection);	185	async_set_client_connection(vfs_connection);
169		186
170	/*	187	/*
171	* Register at the naming service.	188	* Register at the naming service.
172	*/	189	*/
173	ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead);	190	ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead);
174		191
175	/*	192	/*
176	* Start accepting connections.	193	* Start accepting connections.
177	*/	194	*/
178	printf(NAME ": Accepting connections\n");	195	printf(NAME ": Accepting connections\n");
179	async_manager();	196	async_manager();
180	return 0;	197	return 0;
181	}	198	}
182		199
183	/**	200	/**
184	* @}	201	* @}
185	*/	202	*/
186		203

Subversion Repositories HelenOS

(root)/trunk/uspace/srv/vfs/vfs.c – Rev 3847 → 3849