WebSVN – HelenOS – Diff – /branches/dd/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 <adt/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 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_OPEN_NODE:
            vfs_open_node(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;
        case VFS_DEVICE:
            vfs_device(callid, &call);
            break;
        case VFS_SYNC:
            vfs_sync(callid, &call);
            break;
        case VFS_NODE:
            vfs_node(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_pending(vfs_process_pending_mount);
    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 4420	Rev 4537
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 <adt/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 = true;	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_call_t call;	73	ipc_call_t call;
74	ipc_callid_t callid = async_get_call(&call);	74	ipc_callid_t callid = async_get_call(&call);
75		75
76	fs_handle_t fs_handle;	76	fs_handle_t fs_handle;
77	int phone;	77	int phone;
78		78
79	switch (IPC_GET_METHOD(call)) {	79	switch (IPC_GET_METHOD(call)) {
80	case IPC_M_PHONE_HUNGUP:	80	case IPC_M_PHONE_HUNGUP:
81	keep_on_going = false;	81	keep_on_going = false;
82	break;	82	break;
83	case VFS_REGISTER:	83	case VFS_REGISTER:
84	vfs_register(callid, &call);	84	vfs_register(callid, &call);
85	/*	85	/*
86	* Keep the connection open so that a file system can	86	* Keep the connection open so that a file system can
87	* later ask us to connect it to another file system.	87	* later ask us to connect it to another file system.
88	* This is necessary to support non-root mounts.	88	* This is necessary to support non-root mounts.
89	*/	89	*/
90	break;	90	break;
91	case VFS_MOUNT:	91	case VFS_MOUNT:
92	vfs_mount(callid, &call);	92	vfs_mount(callid, &call);
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_OPEN_NODE:
-		98	vfs_open_node(callid, &call);
-		99	break;
97	case VFS_CLOSE:	100	case VFS_CLOSE:
98	vfs_close(callid, &call);	101	vfs_close(callid, &call);
99	break;	102	break;
100	case VFS_READ:	103	case VFS_READ:
101	vfs_read(callid, &call);	104	vfs_read(callid, &call);
102	break;	105	break;
103	case VFS_WRITE:	106	case VFS_WRITE:
104	vfs_write(callid, &call);	107	vfs_write(callid, &call);
105	break;	108	break;
106	case VFS_SEEK:	109	case VFS_SEEK:
107	vfs_seek(callid, &call);	110	vfs_seek(callid, &call);
108	break;	111	break;
109	case VFS_TRUNCATE:	112	case VFS_TRUNCATE:
110	vfs_truncate(callid, &call);	113	vfs_truncate(callid, &call);
111	break;	114	break;
112	case VFS_MKDIR:	115	case VFS_MKDIR:
113	vfs_mkdir(callid, &call);	116	vfs_mkdir(callid, &call);
114	break;	117	break;
115	case VFS_UNLINK:	118	case VFS_UNLINK:
116	vfs_unlink(callid, &call);	119	vfs_unlink(callid, &call);
117	break;	120	break;
118	case VFS_RENAME:	121	case VFS_RENAME:
119	vfs_rename(callid, &call);	122	vfs_rename(callid, &call);
120	break;	123	break;
-		124	case VFS_DEVICE:
-		125	vfs_device(callid, &call);
-		126	break;
-		127	case VFS_SYNC:
-		128	vfs_sync(callid, &call);
-		129	break;
-		130	case VFS_NODE:
-		131	vfs_node(callid, &call);
-		132	break;
121	default:	133	default:
122	ipc_answer_0(callid, ENOTSUP);	134	ipc_answer_0(callid, ENOTSUP);
123	break;	135	break;
124	}	136	}
125	}	137	}
126		138
127	/* TODO: cleanup after the client */	139	/* TODO: cleanup after the client */
128	}	140	}
129		141
130	int main(int argc, char **argv)	142	int main(int argc, char **argv)
131	{	143	{
132	printf(NAME ": HelenOS VFS server\n");	144	printf(NAME ": HelenOS VFS server\n");
133		145
134	/*	146	/*
135	* Initialize the list of registered file systems.	147	* Initialize the list of registered file systems.
136	*/	148	*/
137	list_initialize(&fs_head);	149	list_initialize(&fs_head);
138		150
139	/*	151	/*
140	* Initialize VFS node hash table.	152	* Initialize VFS node hash table.
141	*/	153	*/
142	if (!vfs_nodes_init()) {	154	if (!vfs_nodes_init()) {
143	printf(NAME ": Failed to initialize VFS node hash table\n");	155	printf(NAME ": Failed to initialize VFS node hash table\n");
144	return ENOMEM;	156	return ENOMEM;
145	}	157	}
146		158
147	/*	159	/*
148	* Allocate and initialize the Path Lookup Buffer.	160	* Allocate and initialize the Path Lookup Buffer.
149	*/	161	*/
150	list_initialize(&plb_head);	162	list_initialize(&plb_head);
151	plb = as_get_mappable_page(PLB_SIZE);	163	plb = as_get_mappable_page(PLB_SIZE);
152	if (!plb) {	164	if (!plb) {
153	printf(NAME ": Cannot allocate a mappable piece of address space\n");	165	printf(NAME ": Cannot allocate a mappable piece of address space\n");
154	return ENOMEM;	166	return ENOMEM;
155	}	167	}
156		168
157	if (as_area_create(plb, PLB_SIZE, AS_AREA_READ \| AS_AREA_WRITE \|	169	if (as_area_create(plb, PLB_SIZE, AS_AREA_READ \| AS_AREA_WRITE \|
158	AS_AREA_CACHEABLE) != plb) {	170	AS_AREA_CACHEABLE) != plb) {
159	printf(NAME ": Cannot create address space area\n");	171	printf(NAME ": Cannot create address space area\n");
160	return ENOMEM;	172	return ENOMEM;
161	}	173	}
162	memset(plb, 0, PLB_SIZE);	174	memset(plb, 0, PLB_SIZE);
163		175
164	/*	176	/*
165	* Set a connectio handling function/fibril.	177	* Set a connectio handling function/fibril.
166	*/	178	*/
-		179	async_set_pending(vfs_process_pending_mount);
167	async_set_client_connection(vfs_connection);	180	async_set_client_connection(vfs_connection);
168		181
169	/*	182	/*
170	* Register at the naming service.	183	* Register at the naming service.
171	*/	184	*/
172	ipcarg_t phonead;	185	ipcarg_t phonead;
173	ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead);	186	ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead);
174		187
175	/*	188	/*
176	* Start accepting connections.	189	* Start accepting connections.
177	*/	190	*/
178	printf(NAME ": Accepting connections\n");	191	printf(NAME ": Accepting connections\n");
179	async_manager();	192	async_manager();
180	return 0;	193	return 0;
181	}	194	}
182		195
183	/**	196	/**
184	* @}	197	* @}
185	*/	198	*/
186		199

Subversion Repositories HelenOS

(root)/branches/dd/uspace/srv/vfs/vfs.c – Rev 4420 → 4537