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source: trunk/kernel/vfs/vfs.c @ 302

Last change on this file since 302 was 296, checked in by alain, 7 years ago
Several modifs in the generic scheduler and in the hal_context to fix the context switch mechanism.
File size: 58.1 KB

Rev	Line
[1]	1	/*
	2	* vfs.c - Virtual File System implementation.
	3	*
	4	* Author Mohamed Lamine Karaoui (2015)
	5	* Alain Greiner (2016)
	6	*
	7	* Copyright (c) UPMC Sorbonne Universites
	8	*
	9	* This file is part of ALMOS-MKH.
	10	*
	11	* ALMOS-MKH is free software; you can redistribute it and/or modify it
	12	* under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; version 2.0 of the License.
	14	*
	15	* ALMOS-MKH is distributed in the hope that it will be useful, but
	16	* WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	* General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with ALMOS-MKH; if not, write to the Free Software Foundation,
	22	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	23	*/
	24
	25
[14]	26	#include <kernel_config.h>
[1]	27	#include <hal_types.h>
	28	#include <hal_atomic.h>
	29	#include <hal_special.h>
	30	#include <readlock.h>
	31	#include <spinlock.h>
	32	#include <printk.h>
	33	#include <list.h>
	34	#include <xlist.h>
	35	#include <slist.h>
	36	#include <xhtab.h>
[23]	37	#include <rpc.h>
[1]	38	#include <errno.h>
	39	#include <kmem.h>
	40	#include <mapper.h>
	41	#include <thread.h>
	42	#include <process.h>
[23]	43	#include <vfs.h>
[1]	44	#include <fatfs.h>
	45	#include <ramfs.h>
[23]	46	#include <devfs.h>
	47	#include <syscalls.h>
[1]	48
	49
	50	//////////////////////////////////////////////////////////////////////////////////////////
[50]	51	// Extern variables
[1]	52	//////////////////////////////////////////////////////////////////////////////////////////
	53
[188]	54	extern vfs_ctx_t fs_context[FS_TYPES_NR]; // allocated in kernel_init.c
	55
[50]	56
[1]	57	//////////////////////////////////////////////////////////////////////////////////////////
	58	// Context related functions
	59	//////////////////////////////////////////////////////////////////////////////////////////
	60
[188]	61	////////////////////////////////////////
	62	void vfs_ctx_init( vfs_fs_type_t type,
	63	uint32_t attr,
	64	uint32_t total_clusters,
	65	uint32_t cluster_size,
	66	xptr_t vfs_root_xp,
	67	void * extend )
	68	{
	69	vfs_ctx_t * vfs_ctx = &fs_context[type];
	70
	71	vfs_ctx->type = type;
	72	vfs_ctx->attr = attr;
	73	vfs_ctx->total_clusters = total_clusters;
	74	vfs_ctx->cluster_size = cluster_size;
	75	vfs_ctx->vfs_root_xp = vfs_root_xp;
	76	vfs_ctx->extend = extend;
	77
	78	spinlock_init( &vfs_ctx->lock );
	79
	80	bitmap_init( vfs_ctx->bitmap , BITMAP_SIZE(CONFIG_VFS_MAX_INODES) );
	81	}
	82
[23]	83	////////////////////////////////////////////
[1]	84	error_t vfs_ctx_inum_alloc( vfs_ctx_t * ctx,
	85	uint32_t * inum )
	86	{
	87	// get lock on inum allocator
	88	spinlock_lock( &ctx->lock );
	89
	90	// get lid from local inum allocator
[23]	91	uint32_t lid = bitmap_ffc( ctx->bitmap , CONFIG_VFS_MAX_INODES );
[1]	92
	93	if( lid == -1 ) // no more free slot => error
	94	{
	95	// release lock
	96	spinlock_unlock( &ctx->lock );
	97
	98	// return error
	99	return 1;
	100	}
	101	else // found => return inum
	102	{
	103	// set slot allocated
[23]	104	bitmap_set( ctx->bitmap , lid );
[1]	105
	106	// release lock
	107	spinlock_unlock( &ctx->lock );
	108
	109	// return inum
	110	*inum = (((uint32_t)local_cxy) << 16) \| (lid & 0xFFFF);
	111	return 0;
	112	}
	113	}
	114
	115	////////////////////////////////////////////
	116	void vfs_ctx_inum_release( vfs_ctx_t * ctx,
	117	uint32_t inum )
	118	{
[23]	119	bitmap_clear( ctx->bitmap , inum & 0xFFFF );
[1]	120	}
	121
	122	//////////////////////////////////////////////////////////////////////////////////////////
	123	// Inode related functions
	124	//////////////////////////////////////////////////////////////////////////////////////////
	125
[188]	126	char * vfs_inode_type_str( uint32_t type )
	127	{
	128	if ( type == INODE_TYPE_FILE ) return "FILE";
	129	else if( type == INODE_TYPE_DIR ) return "DIR ";
	130	else if( type == INODE_TYPE_FIFO ) return "FIFO";
	131	else if( type == INODE_TYPE_PIPE ) return "PIPE";
	132	else if( type == INODE_TYPE_SOCK ) return "SOCK";
	133	else if( type == INODE_TYPE_DEV ) return "DEV ";
	134	else if( type == INODE_TYPE_SYML ) return "SYML";
	135	else return "undefined";
	136	}
	137
[23]	138	//////////////////////////////////////////////////////
	139	error_t vfs_inode_create( xptr_t dentry_xp,
	140	vfs_fs_type_t fs_type,
	141	vfs_inode_type_t inode_type,
[188]	142	void * extend,
[23]	143	uint32_t attr,
	144	uint32_t rights,
	145	uid_t uid,
	146	gid_t gid,
	147	xptr_t * inode_xp )
[1]	148	{
	149	mapper_t * mapper; // associated mapper( to be allocated)
	150	vfs_inode_t * inode; // inode descriptor (to be allocated)
	151	uint32_t inum; // inode identifier (to be allocated)
	152	vfs_ctx_t * ctx; // file system context
	153	kmem_req_t req; // request to kernel memory allocator
	154	error_t error;
	155
[296]	156	vfs_dmsg("\n[INFO] %s : enter / local_cxy = %x / parent_xp = %l\n",
	157	__FUNCTION__ , local_cxy , dentry_xp );
[279]	158
[23]	159	// check fs type and get pointer on context
	160	if ( fs_type == FS_TYPE_FATFS ) ctx = &fs_context[FS_TYPE_FATFS];
	161	else if( fs_type == FS_TYPE_RAMFS ) ctx = &fs_context[FS_TYPE_RAMFS];
	162	else if( fs_type == FS_TYPE_DEVFS ) ctx = &fs_context[FS_TYPE_DEVFS];
[1]	163	else
	164	{
	165	ctx = NULL;
[246]	166	printk("\n[PANIC] in %s : illegal file system type = %d\n", __FUNCTION__ , fs_type );
[1]	167	hal_core_sleep();
	168	}
	169
	170	// allocate inum
	171	error = vfs_ctx_inum_alloc( ctx , &inum );
	172
	173	if( error )
	174	{
	175	printk("\n[ERROR] in %s : cannot allocate inum\n", __FUNCTION__ );
	176	return ENOMEM;
	177	}
	178
	179	// allocate memory for mapper
[246]	180	mapper = mapper_create( fs_type );
[1]	181
	182	if( mapper == NULL )
	183	{
	184	printk("\n[ERROR] in %s : cannot allocate mapper\n", __FUNCTION__ );
	185	vfs_ctx_inum_release( ctx , inum );
	186	return ENOMEM;
	187	}
	188
[23]	189	// allocate memory for VFS inode descriptor
[1]	190	req.type = KMEM_VFS_INODE;
	191	req.size = sizeof(vfs_inode_t);
	192	req.flags = AF_KERNEL \| AF_ZERO;
	193	inode = (vfs_inode_t *)kmem_alloc( &req );
	194
	195	if( inode == NULL )
	196	{
	197	printk("\n[ERROR] in %s : cannot allocate inode descriptor\n", __FUNCTION__ );
	198	vfs_ctx_inum_release( ctx , inum );
	199	mapper_destroy( mapper );
	200	return ENOMEM;
	201	}
	202
	203	// initialize inode descriptor
	204	inode->gc = 0;
[23]	205	inode->type = inode_type;
[1]	206	inode->inum = inum;
	207	inode->attr = attr;
[23]	208	inode->rights = rights;
[1]	209	inode->uid = uid;
	210	inode->gid = gid;
	211	inode->refcount = 0;
	212	inode->parent_xp = dentry_xp;
	213	inode->ctx = ctx;
[246]	214	inode->mapper = mapper;
[188]	215	inode->extend = extend;
[1]	216
[246]	217	// initialise inode field in mapper
	218	mapper->inode = inode;
	219
[1]	220	// initialise threads waiting queue
	221	xlist_root_init( XPTR( local_cxy , &inode->wait_root ) );
	222
[204]	223	// initialize dentries hash table
	224	xhtab_init( &inode->children , XHTAB_DENTRY_TYPE );
[1]	225
	226	// initialize inode locks
[10]	227	remote_rwlock_init( XPTR( local_cxy , &inode->data_lock ) );
[1]	228	remote_spinlock_init( XPTR( local_cxy , &inode->main_lock ) );
	229
[296]	230	vfs_dmsg("\n[INFO] %s : exit / child_xp = %l / parent_xp = %l\n",
	231	__FUNCTION__ , XPTR( local_cxy , inode ) , dentry_xp );
[279]	232
[1]	233	// return extended pointer on inode
	234	*inode_xp = XPTR( local_cxy , inode );
	235	return 0;
	236
	237	} // end vfs_inode_create()
	238
	239	/////////////////////////////////////////////
	240	void vfs_inode_destroy( vfs_inode_t * inode )
	241	{
	242	if( inode->refcount )
	243	{
	244	printk("\n[PANIC] in %s : inode refcount non zero\n", __FUNCTION__ );
	245	hal_core_sleep();
	246	}
	247
	248	// release memory allocated for mapper
	249	mapper_destroy( inode->mapper );
	250
	251	// release memory allocate for inode descriptor
	252	kmem_req_t req;
	253	req.ptr = inode;
	254	req.type = KMEM_VFS_INODE;
	255	kmem_free( &req );
	256
	257	} // end vfs_inode_destroy()
	258
[238]	259	/////////////////////////////////////////////
	260	error_t vfs_inode_load( vfs_inode_t * parent,
	261	char * name,
	262	xptr_t child_xp )
	263	{
[246]	264	vfs_dmsg("\n[INFO] %s : enter for child <%s>\n",
	265	__FUNCTION__ , name );
	266
[238]	267	error_t error = 0;
	268
	269	assert( (parent != NULL) , __FUNCTION__ , "parent pointer is NULL\n");
	270
	271	assert( (child_xp != XPTR_NULL) , __FUNCTION__ , "child pointer is NULL\n");
	272
	273	// get parent inode FS type
	274	vfs_fs_type_t fs_type = parent->ctx->type;
	275
	276	// call relevant FS function
	277	if( fs_type == FS_TYPE_FATFS )
	278	{
	279	error = fatfs_inode_load( parent , name , child_xp );
	280	}
	281	else if( fs_type == FS_TYPE_RAMFS )
	282	{
	283	assert( false , __FUNCTION__ , "should not be called for RAMFS\n" );
	284	}
	285	else if( fs_type == FS_TYPE_DEVFS )
	286	{
	287	assert( false , __FUNCTION__ , "should not be called for DEVFS\n" );
	288	}
	289	else
	290	{
	291	assert( false , __FUNCTION__ , "undefined file system type\n" );
	292	}
	293
[246]	294	vfs_dmsg("\n[INFO] %s : exit for child <%s>\n",
	295	__FUNCTION__ , name );
	296
[238]	297	return error;
	298
	299	} // end vfs_load_inode()
	300
[1]	301	////////////////////////////////////////////
	302	void vfs_inode_remote_up( xptr_t inode_xp )
	303	{
	304	// get inode cluster and local pointer
	305	cxy_t inode_cxy = GET_CXY( inode_xp );
	306	vfs_inode_t * inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	307
	308	hal_remote_atomic_add( XPTR( inode_cxy , &inode_ptr->refcount ) , 1 );
	309	}
	310
	311	//////////////////////////////////////////////
	312	void vfs_inode_remote_down( xptr_t inode_xp )
	313	{
	314	// get inode cluster and local pointer
	315	cxy_t inode_cxy = GET_CXY( inode_xp );
	316	vfs_inode_t * inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	317
	318	hal_remote_atomic_add( XPTR( inode_cxy , &inode_ptr->refcount ) , -1 );
	319	}
	320
	321	//////////////////////////////////////////////
	322	uint32_t vfs_inode_get_size( xptr_t inode_xp )
	323	{
	324	// get inode cluster and local pointer
	325	cxy_t cxy = GET_CXY( inode_xp );
	326	vfs_inode_t * ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	327
	328	// get size
[10]	329	remote_rwlock_rd_lock( XPTR( cxy , &ptr->data_lock ) );
[1]	330	uint32_t size = hal_remote_lw( XPTR( cxy , &ptr->size ) );
[10]	331	remote_rwlock_rd_unlock( XPTR( cxy , &ptr->data_lock ) );
[1]	332	return size;
	333	}
	334
[101]	335	////////////////////////////////////////////
	336	void vfs_inode_set_size( xptr_t inode_xp,
[1]	337	uint32_t size )
	338	{
	339	// get inode cluster and local pointer
	340	cxy_t cxy = GET_CXY( inode_xp );
	341	vfs_inode_t * ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	342
	343	// set size
[10]	344	remote_rwlock_wr_unlock( XPTR( cxy , &ptr->data_lock ) );
[1]	345	hal_remote_sw( XPTR( cxy , &ptr->size ) , size );
[10]	346	remote_rwlock_wr_unlock( XPTR( cxy , &ptr->data_lock ) );
[1]	347	}
	348
[101]	349	////////////////////////////////////////
	350	void vfs_inode_unlock( xptr_t inode_xp )
[1]	351	{
	352	// get inode cluster and local pointer
	353	cxy_t cxy = GET_CXY( inode_xp );
	354	vfs_inode_t * ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	355
	356	// release the main lock
	357	remote_spinlock_unlock( XPTR( cxy , &ptr->main_lock ) );
	358	}
	359
[101]	360	//////////////////////////////////////
	361	void vfs_inode_lock( xptr_t inode_xp )
[1]	362	{
	363	// get inode cluster and local pointer
	364	cxy_t cxy = GET_CXY( inode_xp );
	365	vfs_inode_t * ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	366
	367	// get the main lock
	368	remote_spinlock_lock( XPTR( cxy , &ptr->main_lock ) );
	369	}
	370
[101]	371	/////////////////////////////////////////
	372	xptr_t vfs_inode_owner( xptr_t inode_xp )
	373	{
	374	// get inode cluster and local pointer
	375	cxy_t cxy = GET_CXY( inode_xp );
	376	vfs_inode_t * ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	377
	378	// get the main lock
	379	return remote_spinlock_owner( XPTR( cxy , &ptr->main_lock ) );
	380	}
	381
[204]	382	/////////////////////////////////////////
	383	void vfs_inode_display( xptr_t inode_xp )
	384	{
	385	cxy_t inode_cxy;
	386	vfs_inode_t * inode_ptr;
	387	xptr_t dentry_xp;
	388	cxy_t dentry_cxy;
	389	vfs_dentry_t * dentry_ptr;
	390
	391	char name[CONFIG_VFS_MAX_NAME_LENGTH];
	392
	393	// get inode cluster and local pointer
	394	inode_cxy = GET_CXY( inode_xp );
	395	inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	396
	397	// get parent dentry
	398	dentry_xp = hal_remote_lwd( XPTR( inode_cxy , &inode_ptr->parent_xp ) );
	399
	400	// get local copy of name
	401	if( dentry_xp == XPTR_NULL ) // it is the VFS root
	402	{
	403	strcpy( name , "/" );
	404	}
	405	else // not the VFS root
	406	{
	407	dentry_cxy = GET_CXY( dentry_xp );
	408	dentry_ptr = (vfs_dentry_t *)GET_PTR( dentry_xp );
	409
	410	hal_remote_strcpy( XPTR( local_cxy , name ) ,
	411	XPTR( dentry_cxy , &dentry_ptr->name ) );
	412	}
	413
	414	// display inode header
	415	printk("\n* inode <%s> / inode_xp = %l / dentry_xp = %l *\n",
	416	name , inode_xp , dentry_xp );
	417
	418	// display children from xhtab
	419	xhtab_display( XPTR( inode_cxy , &inode_ptr->children ) );
	420
	421	} // end vfs_inode_display()
	422
	423	////////////////////////////////////////////////////////////////////////////////////////////
[1]	424	// Dentry related functions
	425	//////////////////////////////////////////////////////////////////////////////////////////
	426
[23]	427	///////////////////////////////////////////////////
	428	error_t vfs_dentry_create( vfs_fs_type_t fs_type,
	429	char * name,
	430	vfs_inode_t * parent,
	431	xptr_t * dentry_xp )
[1]	432	{
	433	vfs_ctx_t * ctx; // context descriptor
	434	vfs_dentry_t * dentry; // dentry descriptor (to be allocated)
	435	kmem_req_t req; // request to kernel memory allocator
	436
[296]	437	vfs_dmsg("\n[INFO] %s : enter for %s / parent inode = %x / cycle = %d\n",
	438	__FUNCTION__ , name , parent , hal_time_stamp() );
	439
[188]	440	// get pointer on context
[23]	441	if ( fs_type == FS_TYPE_FATFS ) ctx = &fs_context[FS_TYPE_FATFS];
	442	else if( fs_type == FS_TYPE_RAMFS ) ctx = &fs_context[FS_TYPE_RAMFS];
	443	else if( fs_type == FS_TYPE_DEVFS ) ctx = &fs_context[FS_TYPE_DEVFS];
[1]	444	else
	445	{
	446	ctx = NULL;
	447	printk("\n[PANIC] in %s : undefined file system type\n", __FUNCTION__ );
	448	hal_core_sleep();
	449	}
	450
	451	// get name length
	452	uint32_t length = strlen( name );
	453
[23]	454	if( length >= CONFIG_VFS_MAX_NAME_LENGTH )
[1]	455	{
	456	printk("\n[ERROR] in %s : name too long\n", __FUNCTION__ );
	457	return EINVAL;
	458	}
	459
	460	// allocate memory for dentry descriptor
	461	req.type = KMEM_VFS_DENTRY;
	462	req.size = sizeof(vfs_dentry_t);
	463	req.flags = AF_KERNEL \| AF_ZERO;
	464	dentry = (vfs_dentry_t *)kmem_alloc( &req );
	465
	466	if( dentry == NULL )
	467	{
	468	printk("\n[ERROR] in %s : cannot allocate dentry descriptor\n", __FUNCTION__ );
	469	return ENOMEM;
	470	}
	471
	472	// initialize dentry descriptor
[23]	473
[1]	474	dentry->ctx = ctx;
	475	dentry->length = length;
	476	dentry->parent = parent;
	477	strcpy( dentry->name , name );
	478
[23]	479	// register dentry in hash table rooted in parent inode
	480	xhtab_insert( XPTR( local_cxy , &parent->children ),
	481	name,
[188]	482	XPTR( local_cxy , &dentry->list ) );
[23]	483
	484	// return extended pointer on dentry
[1]	485	*dentry_xp = XPTR( local_cxy , dentry );
	486
[296]	487	vfs_dmsg("\n[INFO] %s : exit for %s / cycle = %d\n",
	488	__FUNCTION__ , name , hal_time_stamp() );
	489
[1]	490	return 0;
	491
	492	} // end vfs_dentry_create()
	493
	494	////////////////////////////////////////////////
	495	void vfs_dentry_destroy( vfs_dentry_t * dentry )
	496	{
	497	if( dentry->refcount )
	498	{
	499	printk("\n[PANIC] in %s : dentry refcount non zero\n", __FUNCTION__ );
	500	hal_core_sleep();
	501	}
	502
	503	kmem_req_t req;
	504	req.ptr = dentry;
	505	req.type = KMEM_VFS_DENTRY;
	506	kmem_free( &req );
	507	}
	508
	509
[188]	510
[1]	511	//////////////////////////////////////////////////////////////////////////////////////////
	512	// File descriptor related functions
	513	//////////////////////////////////////////////////////////////////////////////////////////
	514
[23]	515	/////////////////////////////////////////////
	516	error_t vfs_file_create( vfs_inode_t * inode,
	517	uint32_t attr,
	518	xptr_t * file_xp )
	519	{
	520	vfs_file_t * file;
	521	kmem_req_t req;
	522
	523	// allocate memory for new file descriptor
	524	req.type = KMEM_VFS_FILE;
	525	req.size = sizeof(vfs_file_t);
	526	req.flags = AF_KERNEL \| AF_ZERO;
	527	file = (vfs_file_t *)kmem_alloc( &req );
	528
	529	if( file == NULL ) return ENOMEM;
	530
	531	// initializes new file descriptor
	532	file->gc = 0;
	533	file->type = inode->type;
	534	file->attr = attr;
	535	file->offset = 0;
	536	file->refcount = 0;
	537	file->inode = inode;
	538	file->ctx = inode->ctx;
	539	file->mapper = inode->mapper;
	540
	541	remote_rwlock_init( XPTR( local_cxy , &file->lock ) );
	542
	543	*file_xp = XPTR( local_cxy , file );
	544	return 0;
	545
	546	} // end vfs_file_create()
	547
	548	///////////////////////////////////////////
	549	void vfs_file_destroy( vfs_file_t * file )
	550	{
	551	if( file->refcount )
	552	{
	553	printk("\n[PANIC] in %s : file refcount non zero\n", __FUNCTION__ );
	554	hal_core_sleep();
	555	}
	556
	557	kmem_req_t req;
	558	req.ptr = file;
	559	req.type = KMEM_VFS_FILE;
	560	kmem_free( &req );
	561
	562	} // end vfs_file_destroy()
	563
	564
[1]	565	////////////////////////////////////////
	566	void vfs_file_count_up( xptr_t file_xp )
	567	{
	568	// get file cluster and local pointer
	569	cxy_t file_cxy = GET_CXY( file_xp );
	570	vfs_file_t * file_ptr = (vfs_file_t *)GET_PTR( file_xp );
	571
	572	// atomically increment count
	573	hal_remote_atomic_add( XPTR( file_cxy , &file_ptr->refcount ) , 1 );
	574	}
	575
	576	//////////////////////////////////////////
	577	void vfs_file_count_down( xptr_t file_xp )
	578	{
	579	// get file cluster and local pointer
	580	cxy_t file_cxy = GET_CXY( file_xp );
	581	vfs_file_t * file_ptr = (vfs_file_t *)GET_PTR( file_xp );
	582
	583	// atomically decrement count
	584	hal_remote_atomic_add( XPTR( file_cxy , &file_ptr->refcount ) , -1 );
	585	}
	586
[23]	587	//////////////////////////////////////////////////////////////////////////////////////////
	588	// File access related functions
	589	//////////////////////////////////////////////////////////////////////////////////////////
	590
	591	////////////////////////////////////
	592	error_t vfs_open( xptr_t cwd_xp,
	593	char * path,
	594	uint32_t flags,
	595	uint32_t mode,
	596	xptr_t * new_file_xp,
	597	uint32_t * new_file_id )
[1]	598	{
[23]	599	error_t error;
	600	xptr_t inode_xp; // extended pointer on target inode
	601	cxy_t inode_cxy; // inode cluster identifier
	602	vfs_inode_t * inode_ptr; // inode local pointer
	603	uint32_t file_attr; // file descriptor attributes
	604	uint32_t lookup_mode; // lookup working mode
	605	xptr_t file_xp; // extended pointer on created file descriptor
	606	uint32_t file_id; // created file descriptor index in reference fd_array
[1]	607
[101]	608	vfs_dmsg("\n[INFO] %s : enters for <%s> at cycle %d\n",
[204]	609	__FUNCTION__ , path , (uint32_t)hal_time_stamp() );
[101]	610
[23]	611	// compute lookup working mode
	612	lookup_mode = VFS_LOOKUP_OPEN;
	613	if( (flags & O_DIR ) ) lookup_mode \|= VFS_LOOKUP_DIR;
	614	if( (flags & O_CREAT ) ) lookup_mode \|= VFS_LOOKUP_CREATE;
	615	if( (flags & O_EXCL ) ) lookup_mode \|= VFS_LOOKUP_EXCL;
	616
	617	// compute attributes for the created file
	618	file_attr = 0;
	619	if( (flags & O_RDONLY ) == 0 ) file_attr \|= FD_ATTR_READ_ENABLE;
	620	if( (flags & O_WRONLY ) == 0 ) file_attr \|= FD_ATTR_WRITE_ENABLE;
	621	if( (flags & O_SYNC ) ) file_attr \|= FD_ATTR_SYNC;
	622	if( (flags & O_APPEND ) ) file_attr \|= FD_ATTR_APPEND;
	623	if( (flags & O_CLOEXEC) ) file_attr \|= FD_ATTR_CLOSE_EXEC;
[1]	624
[23]	625	// get extended pointer on target inode
	626	error = vfs_lookup( cwd_xp , path , lookup_mode , &inode_xp );
	627
[101]	628	vfs_dmsg("\n[INFO] %s : get inode_xp = %l for <%s> at cycle %d\n",
	629	__FUNCTION__ , inode_xp , path , hal_get_cycles() );
	630
[23]	631	if( error ) return error;
	632
	633	// get target inode cluster and local pointer
	634	inode_cxy = GET_CXY( inode_xp );
	635	inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	636
	637	// create a new file descriptor in cluster containing inode
	638	if( inode_cxy == local_cxy ) // target cluster is local
[1]	639	{
[23]	640	error = vfs_file_create( inode_ptr , file_attr , &file_xp );
[1]	641	}
[23]	642	else // target cluster is remote
	643	{
	644	rpc_vfs_file_create_client( inode_cxy , inode_ptr , file_attr , &file_xp , &error );
	645	}
[1]	646
[23]	647	if( error ) return error;
[1]	648
[23]	649	// allocate and register a new file descriptor index in reference cluster fd_array
	650	error = process_fd_register( file_xp , &file_id );
[1]	651
[23]	652	if( error ) return error;
[1]	653
[265]	654	vfs_dmsg("\n[INFO] %s : exit for <%s> / file_id = %d / file_xp = %l / at cycle %d\n",
[238]	655	__FUNCTION__ , path , file_id , file_xp , hal_get_cycles() );
	656
[23]	657	// success
	658	*new_file_xp = file_xp;
	659	*new_file_id = file_id;
	660	return 0;
[1]	661
[23]	662	} // end vfs_open()
	663
	664	/////////////////////////////////////
	665	error_t vfs_move( bool_t to_buffer,
[265]	666	bool_t is_user,
[23]	667	xptr_t file_xp,
	668	void * buffer,
	669	uint32_t size )
	670	{
	671	assert( ( file_xp != XPTR_NULL ) , __FUNCTION__ , "file_xp == XPTR_NULL" );
	672
	673	cxy_t file_cxy; // remote file descriptor cluster
	674	vfs_file_t * file_ptr; // remote file descriptor local pointer
	675	vfs_inode_type_t inode_type;
	676	uint32_t file_offset; // current offset in file
	677	mapper_t * mapper;
	678	error_t error;
	679
	680	// get cluster and local pointer on remote file descriptor
	681	file_cxy = GET_CXY( file_xp );
	682	file_ptr = (vfs_file_t *)GET_PTR( file_xp );
	683
	684	// get inode type from remote file descriptor
	685	inode_type = hal_remote_lw( XPTR( file_cxy , &file_ptr->type ) );
	686
	687	// action depends on inode type
	688	if( inode_type == INODE_TYPE_FILE )
	689	{
	690	// get mapper pointer and file offset from file descriptor
	691	file_offset = hal_remote_lw( XPTR( file_cxy , &file_ptr->offset ) );
	692	mapper = (mapper_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->mapper ) );
	693
	694	// move data between mapper and buffer
	695	if( file_cxy == local_cxy )
	696	{
[265]	697	error = mapper_move_buffer( mapper,
	698	to_buffer,
	699	is_user,
	700	file_offset,
	701	buffer,
	702	size );
[23]	703	}
	704	else
	705	{
[265]	706	rpc_mapper_move_buffer_client( file_cxy,
	707	mapper,
	708	to_buffer,
	709	is_user,
	710	file_offset,
	711	buffer,
	712	size,
	713	&error );
[23]	714	}
	715
[265]	716	if( error ) return -1;
	717	else return size;
[23]	718	}
[265]	719	else
[23]	720	{
[265]	721	printk("\n[ERROR] in %s : inode is not a file", __FUNCTION__ );
[23]	722	return -1;
	723	}
[204]	724	} // end vfs_move()
[23]	725
	726	//////////////////////////////////////
	727	error_t vfs_lseek( xptr_t file_xp,
	728	uint32_t offset,
	729	uint32_t whence,
	730	uint32_t * new_offset )
	731	{
[266]	732	xptr_t offset_xp;
	733	xptr_t lock_xp;
	734	cxy_t file_cxy;
	735	vfs_file_t * file_ptr;
	736	vfs_inode_t * inode_ptr;
	737	uint32_t new;
	738
	739	assert( (file_xp != XPTR_NULL) , __FUNCTION__ , "file_xp == XPTR_NULL" );
	740
	741	// get cluster and local pointer on remote file descriptor
	742	file_cxy = GET_CXY( file_xp );
	743	file_ptr = (vfs_file_t *)GET_PTR( file_xp );
	744
	745	// build extended pointers on lock and offset
	746	offset_xp = XPTR( file_cxy , &file_ptr->offset );
	747	lock_xp = XPTR( file_cxy , &file_ptr->lock );
	748
	749	// take file descriptor lock
	750	remote_rwlock_wr_lock( lock_xp );
	751
	752	if ( whence == SEEK_CUR ) // new = current + offset
	753	{
	754	new = hal_remote_lw( offset_xp ) + offset;
	755	}
	756	else if ( whence == SEEK_SET ) // new = offset
	757	{
	758	new = offset;
	759	}
	760	else if ( whence == SEEK_END ) // new = size + offset
	761	{
	762	// get local pointer on remote inode
	763	inode_ptr = (vfs_inode_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
	764
	765	new = hal_remote_lw( XPTR( file_cxy , &inode_ptr->size ) ) + offset;
	766	}
	767	else
	768	{
	769	printk("\n[ERROR] in %s : illegal whence value\n", __FUNCTION__ );
	770	remote_rwlock_wr_unlock( lock_xp );
	771	return -1;
	772	}
	773
	774	// set new offset
	775	hal_remote_sw( offset_xp , new );
	776
	777	// release file descriptor lock
	778	remote_rwlock_wr_unlock( lock_xp );
	779
	780	// success
[271]	781	if ( new_offset != NULL )
	782	*new_offset = new;
[1]	783	return 0;
	784
[23]	785	} // vfs_lseek()
	786
	787	///////////////////////////////////
	788	error_t vfs_close( xptr_t file_xp,
	789	uint32_t file_id )
[1]	790	{
[23]	791	assert( (file_xp != XPTR_NULL) , __FUNCTION__ , "file_xp == XPTR_NULL" );
	792
	793	assert( (file_id < CONFIG_PROCESS_FILE_MAX_NR) , __FUNCTION__ , "illegal file_id" );
	794
	795	thread_t * this = CURRENT_THREAD;
	796	process_t * process = this->process;
	797
	798	// get cluster and local pointer on remote file descriptor
[1]	799	cxy_t file_cxy = GET_CXY( file_xp );
	800	vfs_file_t * file_ptr = (vfs_file_t *)GET_PTR( file_xp );
	801
[23]	802	// get local pointer on local cluster manager
	803	cluster_t * cluster = LOCAL_CLUSTER;
	804
	805	// get owner process cluster and lpid
	806	cxy_t owner_cxy = CXY_FROM_PID( process->pid );
	807	lpid_t lpid = LPID_FROM_PID( process->pid );
	808
	809	// get extended pointers on copies root and lock
	810	xptr_t root_xp = XPTR( owner_cxy , &cluster->pmgr.copies_root[lpid] );
	811	xptr_t lock_xp = XPTR( owner_cxy , &cluster->pmgr.copies_lock[lpid] );
	812
	813	// take the lock protecting the copies
	814	remote_spinlock_lock( lock_xp );
	815
	816	// 1) loop on the process descriptor copies to cancel all fd_array[file_id] entries
	817	xptr_t iter_xp;
	818	XLIST_FOREACH( root_xp , iter_xp )
[1]	819	{
[23]	820	xptr_t process_xp = XLIST_ELEMENT( iter_xp , process_t , copies_list );
	821	cxy_t process_cxy = GET_CXY( process_xp );
	822	process_t * process_ptr = (process_t *)GET_PTR( process_xp );
[1]	823
[23]	824	xptr_t lock_xp = XPTR( process_cxy , &process_ptr->fd_array.lock );
	825	xptr_t entry_xp = XPTR( process_cxy , &process_ptr->fd_array.array[file_id] );
	826
	827	// lock is required for atomic write of a 64 bits word
	828	remote_rwlock_wr_lock( lock_xp );
	829	hal_remote_swd( entry_xp , XPTR_NULL );
	830	remote_rwlock_wr_unlock( lock_xp );
	831
[124]	832	hal_fence();
[23]	833	}
	834
	835	// 2) release memory allocated to file descriptor in remote cluster
	836	if( file_cxy == local_cxy ) // file cluster is local
[1]	837	{
[23]	838	vfs_file_destroy( file_ptr );
	839	}
	840	else // file cluster is local
	841	{
	842	rpc_vfs_file_destroy_client( file_cxy , file_ptr );
	843	}
[1]	844
[23]	845	return 0;
[1]	846
[23]	847	} // end vfs_close()
[1]	848
	849	////////////////////////////////////
[23]	850	error_t vfs_unlink( xptr_t cwd_xp,
	851	char * path )
[1]	852	{
[23]	853	printk("\n[PANIC] %s non implemented\n", __FUNCTION__ );
	854	hal_core_sleep();
[1]	855	return 0;
[23]	856	} // vfs_unlink()
[1]	857
[23]	858	///////////////////////////////////////
	859	error_t vfs_stat( xptr_t file_xp,
	860	vfs_stat_t * k_stat )
[1]	861	{
[23]	862	printk("\n[PANIC] %s non implemented\n", __FUNCTION__ );
	863	hal_core_sleep();
[1]	864	return 0;
	865	}
	866
[23]	867	////////////////////////////////////////////
	868	error_t vfs_readdir( xptr_t file_xp,
	869	vfs_dirent_t * k_dirent )
[1]	870	{
[23]	871	printk("\n[PANIC] %s non implemented\n", __FUNCTION__ );
	872	hal_core_sleep();
[1]	873	return 0;
	874	}
	875
	876	//////////////////////////////////////
[23]	877	error_t vfs_mkdir( xptr_t file_xp,
	878	char * path,
	879	uint32_t mode )
[1]	880	{
[23]	881	printk("\n[PANIC] %s non implemented\n", __FUNCTION__ );
	882	hal_core_sleep();
[1]	883	return 0;
	884	}
	885
[23]	886	////////////////////////////////////
	887	error_t vfs_rmdir( xptr_t file_xp,
	888	char * path )
[1]	889	{
[23]	890	printk("\n[PANIC] %s non implemented\n", __FUNCTION__ );
	891	hal_core_sleep();
[1]	892	return 0;
	893	}
	894
[23]	895	///////////////////////////////////
	896	error_t vfs_chdir( xptr_t cwd_xp,
	897	char * path )
[1]	898	{
[23]	899	error_t error;
	900	xptr_t inode_xp; // extended pointer on target inode
	901	cxy_t inode_cxy; // target inode cluster identifier
	902	vfs_inode_t * inode_ptr; // target inode local pointer
	903	uint32_t mode; // lookup working mode
	904	vfs_inode_type_t inode_type; // target inode type
	905
	906	// set lookup working mode
	907	mode = 0;
	908
	909	// get extended pointer on target inode
	910	error = vfs_lookup( cwd_xp , path , mode , &inode_xp );
	911
	912	if( error ) return error;
	913
	914	// get inode cluster and local pointer
	915	inode_cxy = GET_CXY( inode_xp );
	916	inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	917
	918	// get inode type from remote file
	919	inode_type = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->type ) );
	920
	921	if( inode_type != INODE_TYPE_DIR )
	922	{
	923	CURRENT_THREAD->errno = ENOTDIR;
	924	return -1;
	925	}
	926
	927	printk("\n[PANIC] %s non fully implemented\n", __FUNCTION__ );
	928	hal_core_sleep();
[1]	929	return 0;
	930	}
	931
[23]	932	///////////////////////////////////
	933	error_t vfs_chmod( xptr_t cwd_xp,
	934	char * path,
	935	uint32_t rights )
[1]	936	{
[23]	937	error_t error;
	938	xptr_t inode_xp; // extended pointer on target inode
	939	cxy_t inode_cxy; // inode cluster identifier
	940	vfs_inode_t * inode_ptr; // inode local pointer
	941	uint32_t mode; // lookup working mode
	942	vfs_inode_type_t inode_type; // target inode type
	943
	944	// set lookup working mode
	945	mode = 0;
	946
	947	// get extended pointer on target inode
	948	error = vfs_lookup( cwd_xp , path , mode , &inode_xp );
	949
	950	if( error ) return error;
	951
	952	// get inode cluster and local pointer
	953	inode_cxy = GET_CXY( inode_xp );
	954	inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	955
	956	// get inode type from remote inode
	957	inode_type = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->type ) );
	958
	959
	960	printk("\n[PANIC] %s non fully implemented\n", __FUNCTION__ );
	961	hal_core_sleep();
[1]	962	return 0;
	963	}
	964
[23]	965	///////////////////////////////////
	966	error_t vfs_mkfifo( xptr_t cwd_xp,
	967	char * path,
	968	uint32_t rights )
	969	{
	970	printk("\n[PANIC] in %s : not implemented yet\n", __FUNCTION__ );
	971	hal_core_sleep();
	972	return 0;
	973	}
[1]	974
	975
	976
[188]	977	//////////////////////////////////////////////////////////////////////////////////////////
[1]	978	// Inode Tree functions
	979	//////////////////////////////////////////////////////////////////////////////////////////
	980
[188]	981	/////////////////////////////////
	982	cxy_t vfs_cluster_random_select()
	983	{
	984	uint32_t x_size = LOCAL_CLUSTER->x_size;
	985	uint32_t y_size = LOCAL_CLUSTER->y_size;
	986	uint32_t y_width = LOCAL_CLUSTER->y_width;
	987	uint32_t index = ( hal_get_cycles() + hal_get_gid() ) % (x_size * y_size);
	988	uint32_t x = index / y_size;
	989	uint32_t y = index % y_size;
	990
	991	return (x<<y_width) + y;
	992	}
	993
	994
	995	//////////////////////////////////////////////////////////////////////////
	996	// This static function is called by the vfs_display() function.
	997	//////////////////////////////////////////////////////////////////////////
	998	static void vfs_recursive_display( xptr_t inode_xp,
	999	xptr_t name_xp,
[204]	1000	xptr_t dentry_xp,
[188]	1001	uint32_t indent )
	1002	{
	1003	cxy_t inode_cxy;
	1004	vfs_inode_t * inode_ptr;
	1005	vfs_inode_type_t inode_type;
[204]	1006	xptr_t children_xp; // extended pointer on children xhtab
[188]	1007
[204]	1008	xptr_t child_dentry_xp;
	1009	cxy_t child_dentry_cxy;
	1010	vfs_dentry_t * child_dentry_ptr;
	1011	xptr_t child_inode_xp;
	1012	xptr_t child_dentry_name_xp;
[188]	1013
	1014	char name[CONFIG_VFS_MAX_NAME_LENGTH];
	1015
	1016	char * indent_str[] = { "", // level 0
	1017	" ", // level 1
	1018	" ", // level 2
	1019	" ", // level 3
	1020	" ", // level 4
	1021	" ", // level 5
	1022	" ", // level 6
	1023	" ", // level 7
	1024	" ", // level 8
	1025	" ", // level 9
	1026	" ", // level 10
	1027	" ", // level 11
	1028	" ", // level 12
	1029	" ", // level 13
	1030	" ", // level 14
	1031	" " }; // level 15
	1032
	1033	assert( (inode_xp != XPTR_NULL) , __FUNCTION__ , "inode_xp cannot be NULL\n" );
	1034	assert( (name_xp != XPTR_NULL) , __FUNCTION__ , "name_xp cannot be NULL\n" );
	1035	assert( (indent < 16) , __FUNCTION__ , "depth cannot be larger than 15\n" );
	1036
	1037	// get inode cluster and local pointer
	1038	inode_cxy = GET_CXY( inode_xp );
	1039	inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	1040
	1041	// get inode type
	1042	inode_type = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->type ) );
	1043
	1044	// make a local copy of node name
	1045	hal_remote_strcpy( XPTR( local_cxy , name ) , name_xp );
	1046
	1047	// display inode
[204]	1048	printk("%s%s <%s> inode_xp = %l / dentry_xp = %l\n",
	1049	indent_str[indent], vfs_inode_type_str( inode_type ),
	1050	name , inode_xp , dentry_xp );
[188]	1051
	1052	// scan directory entries
	1053	if( inode_type == INODE_TYPE_DIR )
	1054	{
	1055	// get extended pointer on directory entries xhtab
[204]	1056	children_xp = XPTR( inode_cxy , &inode_ptr->children );
[188]	1057
	1058	// get xhtab lock
[204]	1059	xhtab_read_lock( children_xp );
[188]	1060
	1061	// get first dentry from xhtab
[204]	1062	child_dentry_xp = xhtab_get_first( children_xp );
[188]	1063
[204]	1064	while( child_dentry_xp != XPTR_NULL )
[188]	1065	{
	1066	// get dentry cluster and local pointer
[204]	1067	child_dentry_cxy = GET_CXY( child_dentry_xp );
	1068	child_dentry_ptr = (vfs_dentry_t *)GET_PTR( child_dentry_xp );
[188]	1069
	1070	// get extended pointer on child inode
[204]	1071	child_inode_xp = hal_remote_lwd( XPTR( child_dentry_cxy,
	1072	&child_dentry_ptr->child_xp ) );
[188]	1073
	1074	// get extended pointer on dentry name
[204]	1075	child_dentry_name_xp = XPTR( child_dentry_cxy , &child_dentry_ptr->name );
[188]	1076
	1077	// recursive call on child inode
[204]	1078	vfs_recursive_display( child_inode_xp,
	1079	child_dentry_name_xp,
	1080	child_dentry_xp,
	1081	indent+1 );
[188]	1082
	1083	// get next dentry
[204]	1084	child_dentry_xp = xhtab_get_next( children_xp );
[188]	1085	}
	1086
	1087	// release xhtab lock
[204]	1088	xhtab_read_unlock( children_xp );
[188]	1089	}
	1090	} // end vfs_recursive_display()
	1091
	1092	///////////////////////////////////
	1093	void vfs_display( xptr_t inode_xp )
	1094	{
[204]	1095	xptr_t name_xp;
[188]	1096	xptr_t dentry_xp;
	1097	cxy_t dentry_cxy;
	1098	vfs_dentry_t * dentry_ptr;
	1099
	1100	// get target inode cluster and local pointer
	1101	cxy_t inode_cxy = GET_CXY( inode_xp );
	1102	vfs_inode_t * inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	1103
	1104	// get extended pointer on associated dentry
	1105	dentry_xp = hal_remote_lwd( XPTR( inode_cxy , &inode_ptr->parent_xp ) );
	1106
	1107	// check if target inode is the File System root
	1108	if( dentry_xp == XPTR_NULL )
	1109	{
	1110	// build extended pointer on root name
	1111	name_xp = XPTR( local_cxy , "/" );
	1112	}
	1113	else
	1114	{
	1115	// get dentry cluster and local pointer
	1116	dentry_cxy = GET_CXY( dentry_xp );
	1117	dentry_ptr = (vfs_dentry_t *)GET_PTR( dentry_xp );
	1118
	1119	// get extended pointer on dentry name
	1120	name_xp = XPTR( dentry_cxy , &dentry_ptr->name );
	1121	}
	1122
	1123	// print header
[204]	1124	printk("\n* VFS *\n");
[188]	1125
	1126	// call recursive function
[204]	1127	vfs_recursive_display( inode_xp , name_xp , dentry_xp , 0 );
[188]	1128
[204]	1129	} // end vfs_display()
[188]	1130
[1]	1131	//////////////////////////////////////////////////////////////////////////////////////////
[23]	1132	// This function is used by the vfs_lookup() function.
[1]	1133	// It takes an extended pointer on a remote inode (parent directory inode),
	1134	// and check access_rights violation for the calling thread.
	1135	// It can be used by any thread running in any cluster.
	1136	//////////////////////////////////////////////////////////////////////////////////////////
	1137	// @ inode_xp : extended pointer on inode.
	1138	// @ client_uid : client thread user ID
	1139	// @ client_gid : client thread group ID
	1140	// @ return true if access rights are violated.
	1141	//////////////////////////////////////////////////////////////////////////////////////////
	1142	bool_t vfs_access_denied( xptr_t inode_xp,
	1143	uint32_t client_uid,
	1144	uint32_t client_gid )
	1145	{
	1146	// get found inode cluster and local pointer
	1147	cxy_t inode_cxy = GET_CXY( inode_xp );
	1148	vfs_inode_t * inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	1149
	1150	// get inode access mode, UID, and GID
	1151	// TODO uint32_t mode = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->mode ) );
	1152	uid_t uid = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->uid ) );
	1153	gid_t gid = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->gid ) );
	1154
	1155	// FIXME : me must use mode
	1156	if( (uid == client_uid) \|\| (gid == client_gid) ) return false;
	1157	else return true;
	1158	}
	1159
	1160	//////////////////////////////////////////////////////////////////////////////////////////
	1161	// This static function is used by the vfs_lookup() function.
[204]	1162	// It takes an extended pointer on a remote parent directory inode, a directory
[1]	1163	// entry name, and returns an extended pointer on the child inode.
	1164	// It can be used by any thread running in any cluster.
	1165	//////////////////////////////////////////////////////////////////////////////////////////
	1166	// @ parent_xp : extended pointer on parent inode in remote cluster.
	1167	// @ name : dentry name
	1168	// @ child_xp : [out] buffer for extended pointer on child inode.
	1169	// @ return true if success / return false if not found.
	1170	//////////////////////////////////////////////////////////////////////////////////////////
	1171	static bool_t vfs_get_child( xptr_t parent_xp,
	1172	char * name,
	1173	xptr_t * child_xp )
	1174	{
	1175	xptr_t xhtab_xp; // extended pointer on hash table containing children dentries
	1176	xptr_t dentry_xp; // extended pointer on children dentry
	1177
	1178	// get parent inode cluster and local pointer
	1179	cxy_t parent_cxy = GET_CXY( parent_xp );
	1180	vfs_inode_t * parent_ptr = (vfs_inode_t *)GET_PTR( parent_xp );
	1181
	1182	// get extended pointer on hash table of children directory entries
	1183	xhtab_xp = XPTR( parent_cxy , &parent_ptr->children );
	1184
	1185	// search extended pointer on matching dentry
	1186	dentry_xp = xhtab_lookup( xhtab_xp , name );
	1187
	1188	if( dentry_xp == XPTR_NULL ) return false;
	1189
	1190	// get dentry cluster and local pointer
	1191	cxy_t dentry_cxy = GET_CXY( dentry_xp );
	1192	vfs_dentry_t * dentry_ptr = (vfs_dentry_t *)GET_PTR( dentry_xp );
	1193
	1194	// return child inode
[101]	1195	*child_xp = (xptr_t)hal_remote_lwd( XPTR( dentry_cxy , &dentry_ptr->child_xp ) );
[1]	1196	return true;
	1197
[204]	1198	} // end vfs_get_child()
	1199
[1]	1200	//////////////////////////////////////////////////////////////////////////////////////////
	1201	// This static function is used by the vfs_lookup() function.
	1202	// It takes the <current> pointer on a buffer containing a complete pathname, and return
	1203	// in the <name> buffer, allocated by the caller, a single name in the path.
	1204	// It return also in the <next> pointer the next character to analyse in the path.
	1205	// Finally it returns a <last> boolean, that is true when the returned <name> is the
	1206	// last name in the path. The names are supposed to be separated by one or several '/'
	1207	// characters, that are not written in the <name> buffer.
	1208	//////////////////////////////////////////////////////////////////////////////////////////
	1209	// @ current : pointer on first character to analyse in buffer containing the path.
	1210	// @ name : [out] pointer on buffer allocated by the caller for the returned name.
	1211	// @ next : [out] pointer on next character to analyse in buffer containing the path.
	1212	// @ last : [out] true if the returned name is the last (NUL character found).
	1213	// @ return 0 if success / return EINVAL if string empty (first chracter is NUL).
	1214	//////////////////////////////////////////////////////////////////////////////////////////
	1215	static error_t vfs_get_name_from_path( char * current,
	1216	char * name,
	1217	char ** next,
	1218	bool_t * last )
	1219	{
	1220	char * ptr = current;
	1221
	1222	// skip leading '/' characters
	1223	while( *ptr == '/' ) ptr++;
	1224
	1225	// return EINVAL if string empty
	1226	if( *ptr == 0 ) return EINVAL;
	1227
	1228	// copy all characters in name until NUL or '/'
	1229	while( (ptr != 0) && (ptr !='/') ) (name++) = (ptr++);
	1230
[204]	1231	// set NUL terminating character in name buffer
	1232	*(name++) = 0;
	1233
[1]	1234	// return last an next
	1235	if( *ptr == 0 ) // last found character is NUL => last name in path
	1236	{
	1237	*last = true;
	1238	}
	1239	else // last found character is '/' => skip it
	1240	{
	1241	*last = false;
	1242	*next = ptr + 1;
	1243	}
	1244
	1245	return 0;
[204]	1246
	1247	} // end vfs_get name_from_path()
[188]	1248
[23]	1249	//////////////////////////////////////////////
	1250	error_t vfs_lookup( xptr_t cwd_xp,
	1251	char * pathname,
	1252	uint32_t mode,
	1253	xptr_t * inode_xp )
[1]	1254	{
[101]	1255	char name[CONFIG_VFS_MAX_NAME_LENGTH]; // one name in path
[1]	1256
[23]	1257	xptr_t parent_xp; // extended pointer on parent inode
	1258	cxy_t parent_cxy; // cluster for parent inode
	1259	vfs_inode_t * parent_ptr; // local pointer on parent inode
	1260	xptr_t child_xp; // extended pointer on child inode
	1261	cxy_t child_cxy; // cluster for child inode
	1262	vfs_inode_t * child_ptr; // local pointer on child inode
[238]	1263	vfs_inode_type_t child_type; // child inode type
[23]	1264	vfs_fs_type_t fs_type; // File system type
	1265	vfs_ctx_t * ctx_ptr; // local pointer on FS context
	1266	char * current; // current pointer on path
	1267	char * next; // next value for current pointer
	1268	bool_t last; // true when the name is the last in path
	1269	bool_t found; // true when a child has been found
	1270	thread_t * this; // pointer on calling thread descriptor
	1271	process_t * process; // pointer on calling process descriptor
	1272	error_t error;
[1]	1273
[204]	1274	vfs_dmsg("\n[INFO] %s : enters for <%s> at cycle %d\n",
	1275	__FUNCTION__ , pathname , (uint32_t)hal_time_stamp() );
[101]	1276
[1]	1277	this = CURRENT_THREAD;
	1278	process = this->process;
	1279
	1280	// get extended pointer on first inode to search
	1281	if( pathname[0] == '/' ) parent_xp = process->vfs_root_xp;
	1282	else parent_xp = cwd_xp;
	1283
[101]	1284	// initialise other loop variables
[1]	1285	current = pathname;
	1286	next = NULL;
	1287	last = false;
	1288	child_xp = XPTR_NULL;
	1289
	1290	// take lock on parent inode
[101]	1291	vfs_inode_lock( parent_xp );
[1]	1292
[101]	1293	// load from device if one intermediate node not found
[204]	1294	// exit while loop when last name found (i.e. last == true)
[1]	1295	do
	1296	{
[101]	1297	// get one name from path, and the "last" flag
[1]	1298	vfs_get_name_from_path( current , name , &next , &last );
	1299
[204]	1300	vfs_dmsg("\n[INFO] %s : looking for <%s> / last = %d\n",
[101]	1301	__FUNCTION__ , name , last );
	1302
[204]	1303	// search a child dentry matching name in parent inode
[1]	1304	found = vfs_get_child( parent_xp,
	1305	name,
	1306	&child_xp );
	1307
[238]	1308	// if a child inode is not found in the inode tree:
	1309	// - we create the missing inode/dentry couple in the inode tree,
	1310	// - we scan the parent mapper to complete the child inode (type and extension),
	1311	// - we return an error if child not found on device.
	1312	// - if the missing child is a directory, we load the child mapper from device
	1313
	1314	// for the last name, the behaviour depends on the "mode" argument:
	1315
[246]	1316	if (found == false ) // child node not found in inode tree
[1]	1317	{
[204]	1318	vfs_dmsg("\n[INFO] %s : <%s> not found, try to load it\n",
[101]	1319	__FUNCTION__ , name );
	1320
[1]	1321	// release lock on parent inode
[101]	1322	vfs_inode_unlock( parent_xp );
[1]	1323
[238]	1324	// get parent inode FS type
[23]	1325	parent_cxy = GET_CXY( parent_xp );
	1326	parent_ptr = (vfs_inode_t *)GET_PTR( parent_xp );
[1]	1327
[238]	1328	ctx_ptr = (vfs_ctx_t *)hal_remote_lpt( XPTR( parent_cxy ,
	1329	&parent_ptr->ctx ) );
	1330	fs_type = hal_remote_lw( XPTR( parent_cxy , &ctx_ptr->type ) );
[23]	1331
[238]	1332	// select a cluster for missing inode
	1333	child_cxy = vfs_cluster_random_select();
[188]	1334
	1335	// insert a new child dentry/inode in parent inode
	1336	error = vfs_add_child_in_parent( child_cxy,
[238]	1337	INODE_TYPE_DIR,
[23]	1338	fs_type,
	1339	parent_xp,
[222]	1340	name,
[238]	1341	NULL, // fs_type_specific inode extend
[23]	1342	&child_xp );
[1]	1343	if( error )
	1344	{
[238]	1345	printk("\n[ERROR] in %s : no memory for inode %s in path %s\n",
	1346	__FUNCTION__ , name , pathname );
	1347	return ENOMEM;
	1348	}
	1349
	1350	// scan parent mapper to complete the missing inode
	1351	if( parent_cxy == local_cxy )
	1352	{
	1353	error = vfs_inode_load( parent_ptr,
	1354	name,
	1355	child_xp );
	1356	}
	1357	else
	1358	{
	1359	rpc_vfs_inode_load_client( parent_cxy,
	1360	parent_ptr,
	1361	name,
	1362	child_xp,
	1363	&error );
	1364	}
	1365
	1366	if ( error )
	1367	{
[188]	1368	printk("\n[ERROR] in %s : node %s not found in path %s\n",
[1]	1369	__FUNCTION__ , name , pathname );
	1370	return ENOENT;
	1371	}
	1372
[238]	1373	// get child inode type
	1374	child_ptr = (vfs_inode_t *)GET_PTR( child_xp );
	1375	child_type = hal_remote_lw( XPTR( child_cxy , &child_ptr->type ) );
	1376
	1377	// load child mapper from device if it is a directory
	1378	if( child_type == INODE_TYPE_DIR )
	1379	{
	1380	if( child_cxy == local_cxy )
	1381	{
	1382	error = vfs_mapper_load_all( child_ptr );
	1383	}
	1384	else
	1385	{
	1386	rpc_vfs_mapper_load_all_client( child_cxy,
	1387	child_ptr,
	1388	&error );
	1389	}
	1390
	1391	if ( error )
	1392	{
	1393	printk("\n[ERROR] in %s : cannot access device for node %s in path %s\n",
	1394	__FUNCTION__ , name , pathname );
	1395	return EIO;
	1396	}
	1397	}
	1398
	1399	// TODO handle lookup mode here [AG]
	1400
[1]	1401	// take lock on parent inode
[101]	1402	vfs_inode_lock( parent_xp );
[1]	1403	}
	1404
[204]	1405	vfs_dmsg("\n[INFO] %s : found <%s> / parent = %l / child = %l / last = %d\n",
[238]	1406	__FUNCTION__ , name , parent_xp , child_xp , last );
[101]	1407
	1408	// TODO check access rights
[23]	1409	// error = vfs_access_denied( child_xp,
	1410	// client_uid,
	1411	// client_gid );
	1412	// if( error )
	1413	// {
	1414	// printk("\n[ERROR] in %s : permission denied for %s\n", __FUNCTION__ , name );
	1415	// return EACCES;
	1416	// }
[1]	1417
[238]	1418	// take lock on child inode and release lock on parent
	1419	vfs_inode_lock( child_xp );
[101]	1420	vfs_inode_unlock( parent_xp );
[1]	1421
	1422	// update loop variables
	1423	parent_xp = child_xp;
	1424	current = next;
	1425	}
	1426	while( last == false );
	1427
[238]	1428	// release lock
	1429	vfs_inode_unlock( parent_xp );
[1]	1430
[265]	1431	vfs_dmsg("\n[INFO] in %s : exit <%s> found / inode = %l\n",
[238]	1432	__FUNCTION__ , pathname , child_xp );
[1]	1433
[238]	1434	// return searched pointer
[1]	1435	*inode_xp = child_xp;
	1436
	1437	return 0;
	1438
	1439	} // end vfs_lookup()
	1440
	1441	////////////////////////////////////////////
	1442	error_t vfs_get_path( xptr_t searched_xp,
	1443	char * buffer,
	1444	uint32_t max_size )
	1445	{
	1446	xptr_t dentry_xp; // extended pointer on current dentry
	1447	char * name; // local pointer on current dentry name
	1448	uint32_t length; // length of current dentry name
	1449	uint32_t count; // number of characters written in buffer
	1450	uint32_t index; // slot index in buffer
[23]	1451	xptr_t inode_xp; // extended pointer on
[1]	1452
	1453	// implementation note:
	1454	// we use two variables "index" and "count" because the buffer
	1455	// is actually written in decreasing index order (from leaf to root)
	1456	// TODO : handle conflict with a concurrent rename
	1457	// FIXME : handle synchro in the loop ... [AG]
	1458
	1459	// set the NUL character in buffer / initialise buffer index and count
	1460	buffer[max_size - 1] = 0;
	1461	count = 1;
	1462	index = max_size - 2;
	1463
	1464	// initialize current inode
	1465	inode_xp = searched_xp;
	1466
	1467	// exit when root inode found (i.e. dentry_xp == XPTR_NULL)
	1468	do
	1469	{
	1470	// get inode cluster and local pointer
	1471	cxy_t inode_cxy = GET_CXY( inode_xp );
	1472	vfs_inode_t * inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	1473
	1474	// get extended pointer on parent dentry
	1475	dentry_xp = (xptr_t)hal_remote_lwd( XPTR( inode_cxy , inode_ptr->parent_xp ) );
	1476
	1477	// get dentry cluster and local pointer
	1478	cxy_t dentry_cxy = GET_CXY( dentry_xp );
	1479	vfs_dentry_t * dentry_ptr = (vfs_dentry_t *)GET_PTR( dentry_xp );
	1480
	1481	// get dentry name length and pointer
	1482	length = hal_remote_lw( XPTR( dentry_cxy , &dentry_ptr->length ) );
	1483	name = (char *)hal_remote_lpt( XPTR( dentry_cxy , &dentry_ptr->name ) );
	1484
	1485	// update index and count
	1486	index -= (length + 1);
	1487	count += (length + 1);
	1488
	1489	// check buffer overflow
	1490	if( count >= max_size )
	1491	{
	1492	printk("\n[ERROR] in %s : kernel buffer too small\n", __FUNCTION__ );
	1493	return EINVAL;
	1494	}
	1495
	1496	// update pathname
	1497	hal_remote_memcpy( XPTR( local_cxy , &buffer[index + 1] ) ,
	1498	XPTR( dentry_cxy , name ) , length );
	1499	buffer[index] = '/';
	1500
	1501	// get extended pointer on next inode
	1502	inode_xp = (xptr_t)hal_remote_lwd( XPTR( dentry_cxy , dentry_ptr->parent ) );
	1503	}
	1504	while( (dentry_xp != XPTR_NULL) );
	1505
	1506	return 0;
	1507
	1508	} // end vfs_get_path()
	1509
[188]	1510
	1511	//////////////////////////////////////////////////////////////
	1512	error_t vfs_add_child_in_parent( cxy_t child_cxy,
	1513	vfs_inode_type_t inode_type,
[23]	1514	vfs_fs_type_t fs_type,
	1515	xptr_t parent_xp,
	1516	char * name,
[188]	1517	void * extend,
[23]	1518	xptr_t * child_xp )
[1]	1519	{
[23]	1520	error_t error;
	1521	xptr_t dentry_xp; // extended pointer on created dentry
	1522	xptr_t inode_xp; // extended pointer on created inode
	1523	cxy_t parent_cxy; // parent inode cluster identifier
	1524	vfs_inode_t * parent_ptr; // parent inode local pointer
[1]	1525
	1526	// get parent inode cluster and local pointer
[23]	1527	parent_cxy = GET_CXY( parent_xp );
	1528	parent_ptr = (vfs_inode_t *)GET_PTR( parent_xp );
[1]	1529
[296]	1530	vfs_dmsg("\n[INFO] %s : enter in cluster %x for %s / child_cxy = %x / parent_xp = %l\n",
	1531	__FUNCTION__ , local_cxy , name , child_cxy , parent_xp );
[279]	1532
[204]	1533	// 1. create dentry
[1]	1534	if( parent_cxy == local_cxy ) // parent cluster is the local cluster
	1535	{
[23]	1536	error = vfs_dentry_create( fs_type,
[1]	1537	name,
	1538	parent_ptr,
	1539	&dentry_xp );
[279]	1540
	1541	vfs_dmsg("\n[INFO] %s : dentry created in local cluster %x\n",
	1542	__FUNCTION__ , local_cxy );
[1]	1543	}
	1544	else // parent cluster is remote
	1545	{
	1546	rpc_vfs_dentry_create_client( parent_cxy,
[23]	1547	fs_type,
[1]	1548	name,
	1549	parent_ptr,
	1550	&dentry_xp,
	1551	&error );
[279]	1552
	1553	vfs_dmsg("\n[INFO] %s : dentry created in remote cluster %x\n",
	1554	__FUNCTION__ , parent_cxy );
[1]	1555	}
	1556
	1557	if( error )
	1558	{
	1559	printk("\n[ERROR] in %s : cannot create dentry in cluster %x\n",
	1560	__FUNCTION__ , parent_cxy );
[204]	1561	return ENOMEM;
[1]	1562	}
	1563
[204]	1564	// 2. create child inode TODO : define attr / mode / uid / gid
[1]	1565	uint32_t attr = 0;
	1566	uint32_t mode = 0;
	1567	uint32_t uid = 0;
	1568	uint32_t gid = 0;
	1569
	1570	if( child_cxy == local_cxy ) // child cluster is the local cluster
	1571	{
	1572	error = vfs_inode_create( dentry_xp,
[23]	1573	fs_type,
	1574	inode_type,
[188]	1575	extend,
[1]	1576	attr,
	1577	mode,
	1578	uid,
	1579	gid,
	1580	&inode_xp );
[279]	1581
	1582	vfs_dmsg("\n[INFO] %s : inode created in local cluster %x\n",
	1583	__FUNCTION__ , local_cxy );
[1]	1584	}
	1585	else // child cluster is remote
	1586	{
	1587	rpc_vfs_inode_create_client( child_cxy,
	1588	dentry_xp,
[23]	1589	fs_type,
	1590	inode_type,
[188]	1591	extend,
[1]	1592	attr,
	1593	mode,
	1594	uid,
	1595	gid,
	1596	&inode_xp,
	1597	&error );
[279]	1598
	1599	vfs_dmsg("\n[INFO] %s : inodecreated in remote cluster %x\n",
	1600	__FUNCTION__ , child_cxy );
[1]	1601	}
	1602
	1603	if( error )
	1604	{
	1605	printk("\n[ERROR] in %s : cannot create inode in cluster %x\n",
	1606	__FUNCTION__ , child_cxy );
	1607
	1608	vfs_dentry_t * dentry = (vfs_dentry_t *)GET_PTR( dentry_xp );
	1609	if( parent_cxy == local_cxy ) vfs_dentry_destroy( dentry );
	1610	else rpc_vfs_dentry_destroy_client( parent_cxy , dentry );
[204]	1611	return ENOMEM;
[1]	1612	}
	1613
[204]	1614	// 3. update extended pointer on inode in dentry
	1615	cxy_t dentry_cxy = GET_CXY( dentry_xp );
	1616	vfs_dentry_t * dentry_ptr = (vfs_dentry_t *)GET_PTR( dentry_xp );
	1617	hal_remote_swd( XPTR( dentry_cxy , &dentry_ptr->child_xp ) , inode_xp );
	1618
[296]	1619	vfs_dmsg("\n[INFO] %s : exit in cluster %x for %s\n",
	1620	__FUNCTION__ , local_cxy , name );
	1621
[1]	1622	// success : return extended pointer on child inode
	1623	*child_xp = inode_xp;
	1624	return 0;
	1625
	1626	} // end vfs_add_child_in_parent()
	1627
[23]	1628	//////////////////////////////////////////////////////////////////////////////////////////
	1629	// Mapper related functions
	1630	//////////////////////////////////////////////////////////////////////////////////////////
	1631
[238]	1632	////////////////////////////////////////////
	1633	error_t vfs_mapper_move_page( page_t * page,
	1634	bool_t to_mapper )
[23]	1635	{
[204]	1636	error_t error = 0;
[23]	1637
	1638	assert( (page != NULL) , __FUNCTION__ , "page pointer is NULL\n" );
	1639
[246]	1640	mapper_t * mapper = page->mapper;
[23]	1641
[246]	1642
[23]	1643	assert( (mapper != NULL) , __FUNCTION__ , "no mapper for page\n" );
	1644
[246]	1645	vfs_dmsg("\n[INFO] %s : enters for page = %d in mapper = %x\n",
	1646	__FUNCTION__ , page->index , mapper );
	1647
[23]	1648	// get FS type
[246]	1649	vfs_fs_type_t fs_type = mapper->type;
[23]	1650
[238]	1651	// call relevant FS function
[23]	1652	if( fs_type == FS_TYPE_FATFS )
	1653	{
	1654	rwlock_wr_lock( &mapper->lock );
[246]	1655	error = fatfs_mapper_move_page( page , to_mapper );
[23]	1656	rwlock_wr_unlock( &mapper->lock );
	1657	}
	1658	else if( fs_type == FS_TYPE_RAMFS )
	1659	{
	1660	assert( false , __FUNCTION__ , "should not be called for RAMFS\n" );
	1661	}
	1662	else if( fs_type == FS_TYPE_DEVFS )
	1663	{
	1664	assert( false , __FUNCTION__ , "should not be called for DEVFS\n" );
	1665	}
	1666	else
	1667	{
	1668	assert( false , __FUNCTION__ , "undefined file system type\n" );
	1669	}
	1670
[246]	1671	vfs_dmsg("\n[INFO] %s : exit for page = %d in mapper = %x\n",
	1672	__FUNCTION__ , page->index , mapper );
	1673
[23]	1674	return error;
	1675
[238]	1676	} // end vfs_move_page()
[23]	1677
	1678	//////////////////////////////////////////////////
[238]	1679	error_t vfs_mapper_load_all( vfs_inode_t * inode )
[23]	1680	{
[265]	1681	assert( (inode != NULL) , __FUNCTION__ , "inode pointer is NULL\n" );
[23]	1682
[238]	1683	uint32_t index;
	1684	page_t * page;
[23]	1685
[238]	1686	mapper_t * mapper = inode->mapper;
	1687	uint32_t size = inode->size;
[23]	1688
[265]	1689	assert( (mapper != NULL) , __FUNCTION__ , "mapper pointer is NULL\n" );
[23]	1690
[238]	1691	uint32_t npages = size >> CONFIG_PPM_PAGE_SHIFT;
[265]	1692	if( (size & CONFIG_PPM_PAGE_MASK) \|\| (size == 0) ) npages++;
[238]	1693
[265]	1694	// loop on pages
[238]	1695	for( index = 0 ; index < npages ; index ++ )
[23]	1696	{
[238]	1697	// this function allocates the missing page in mapper,
	1698	// and call the vfs_mapper_move_page() to load the page from device
	1699	page = mapper_get_page( mapper , index );
[23]	1700
[238]	1701	if( page == NULL ) return EIO;
[23]	1702	}
	1703
[238]	1704	return 0;
[23]	1705
[238]	1706	} // end vfs_mapper_load_all()
[23]	1707

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