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source: trunk/kernel/fs/vfs.c @ 544

Last change on this file since 544 was 530, checked in by nicolas.van.phan@…, 6 years ago
Hack to compile on both IOB and LETI for now
File size: 68.9 KB

Rev	Line
[1]	1	/*
	2	* vfs.c - Virtual File System implementation.
	3	*
	4	* Author Mohamed Lamine Karaoui (2015)
[437]	5	* Alain Greiner (2016,2017,2018)
[1]	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>
[457]	27	#include <hal_kernel_types.h>
[1]	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>
[430]	37	#include <string.h>
[23]	38	#include <rpc.h>
[1]	39	#include <errno.h>
	40	#include <kmem.h>
	41	#include <mapper.h>
	42	#include <thread.h>
[337]	43	#include <chdev.h>
[1]	44	#include <process.h>
[23]	45	#include <vfs.h>
[1]	46	#include <fatfs.h>
	47	#include <ramfs.h>
[23]	48	#include <devfs.h>
	49	#include <syscalls.h>
[1]	50
	51
	52	//////////////////////////////////////////////////////////////////////////////////////////
[50]	53	// Extern variables
[1]	54	//////////////////////////////////////////////////////////////////////////////////////////
	55
[337]	56	extern vfs_ctx_t fs_context[FS_TYPES_NR]; // allocated in kernel_init.c
[188]	57
[337]	58	extern chdev_directory_t chdev_dir; // allocated in kernel_init.c
[50]	59
[1]	60	//////////////////////////////////////////////////////////////////////////////////////////
	61	// Context related functions
	62	//////////////////////////////////////////////////////////////////////////////////////////
	63
[188]	64	////////////////////////////////////////
	65	void vfs_ctx_init( vfs_fs_type_t type,
	66	uint32_t attr,
	67	uint32_t total_clusters,
	68	uint32_t cluster_size,
	69	xptr_t vfs_root_xp,
	70	void * extend )
	71	{
	72	vfs_ctx_t * vfs_ctx = &fs_context[type];
	73
	74	vfs_ctx->type = type;
	75	vfs_ctx->attr = attr;
	76	vfs_ctx->total_clusters = total_clusters;
	77	vfs_ctx->cluster_size = cluster_size;
	78	vfs_ctx->vfs_root_xp = vfs_root_xp;
	79	vfs_ctx->extend = extend;
	80
	81	spinlock_init( &vfs_ctx->lock );
	82
	83	bitmap_init( vfs_ctx->bitmap , BITMAP_SIZE(CONFIG_VFS_MAX_INODES) );
	84	}
	85
[23]	86	////////////////////////////////////////////
[1]	87	error_t vfs_ctx_inum_alloc( vfs_ctx_t * ctx,
	88	uint32_t * inum )
	89	{
	90	// get lock on inum allocator
	91	spinlock_lock( &ctx->lock );
	92
	93	// get lid from local inum allocator
[23]	94	uint32_t lid = bitmap_ffc( ctx->bitmap , CONFIG_VFS_MAX_INODES );
[1]	95
[473]	96	if( lid == 0xFFFFFFFF ) // no more free slot => error
[1]	97	{
	98	// release lock
	99	spinlock_unlock( &ctx->lock );
	100
	101	// return error
	102	return 1;
	103	}
	104	else // found => return inum
	105	{
	106	// set slot allocated
[23]	107	bitmap_set( ctx->bitmap , lid );
[1]	108
	109	// release lock
	110	spinlock_unlock( &ctx->lock );
	111
	112	// return inum
	113	*inum = (((uint32_t)local_cxy) << 16) \| (lid & 0xFFFF);
	114	return 0;
	115	}
	116	}
	117
	118	////////////////////////////////////////////
	119	void vfs_ctx_inum_release( vfs_ctx_t * ctx,
	120	uint32_t inum )
	121	{
[23]	122	bitmap_clear( ctx->bitmap , inum & 0xFFFF );
[1]	123	}
	124
	125	//////////////////////////////////////////////////////////////////////////////////////////
	126	// Inode related functions
	127	//////////////////////////////////////////////////////////////////////////////////////////
	128
[527]	129	static const char * vfs_inode_type_str( vfs_inode_type_t type )
[188]	130	{
[527]	131	switch ( type ) {
	132	case INODE_TYPE_FILE: return "FILE";
	133	case INODE_TYPE_DIR: return "DIR ";
	134	case INODE_TYPE_FIFO: return "FIFO";
	135	case INODE_TYPE_PIPE: return "PIPE";
	136	case INODE_TYPE_SOCK: return "SOCK";
	137	case INODE_TYPE_DEV: return "DEV ";
	138	case INODE_TYPE_SYML: return "SYML";
	139	default: return "undefined";
	140	}
[188]	141	}
	142
[23]	143	//////////////////////////////////////////////////////
	144	error_t vfs_inode_create( xptr_t dentry_xp,
	145	vfs_fs_type_t fs_type,
	146	vfs_inode_type_t inode_type,
[188]	147	void * extend,
[23]	148	uint32_t attr,
	149	uint32_t rights,
	150	uid_t uid,
	151	gid_t gid,
	152	xptr_t * inode_xp )
[1]	153	{
	154	mapper_t * mapper; // associated mapper( to be allocated)
	155	vfs_inode_t * inode; // inode descriptor (to be allocated)
	156	uint32_t inum; // inode identifier (to be allocated)
	157	vfs_ctx_t * ctx; // file system context
	158	kmem_req_t req; // request to kernel memory allocator
	159	error_t error;
	160
[438]	161	#if DEBUG_VFS_INODE_CREATE
[433]	162	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	163	if( DEBUG_VFS_INODE_CREATE < cycle )
[433]	164	printk("\n[DBG] %s : thread %x enter / dentry = %x in cluster %x / cycle %d\n",
	165	__FUNCTION__, CURRENT_THREAD, GET_PTR(dentry_xp), GET_CXY(dentry_xp), cycle );
	166	#endif
[279]	167
[23]	168	// check fs type and get pointer on context
	169	if ( fs_type == FS_TYPE_FATFS ) ctx = &fs_context[FS_TYPE_FATFS];
	170	else if( fs_type == FS_TYPE_RAMFS ) ctx = &fs_context[FS_TYPE_RAMFS];
	171	else if( fs_type == FS_TYPE_DEVFS ) ctx = &fs_context[FS_TYPE_DEVFS];
[1]	172	else
	173	{
	174	ctx = NULL;
[492]	175	assert( false , "illegal file system type = %d\n" , fs_type );
[1]	176	}
	177
	178	// allocate inum
	179	error = vfs_ctx_inum_alloc( ctx , &inum );
	180
	181	if( error )
	182	{
	183	printk("\n[ERROR] in %s : cannot allocate inum\n", __FUNCTION__ );
	184	return ENOMEM;
	185	}
	186
	187	// allocate memory for mapper
[246]	188	mapper = mapper_create( fs_type );
[1]	189
	190	if( mapper == NULL )
	191	{
	192	printk("\n[ERROR] in %s : cannot allocate mapper\n", __FUNCTION__ );
	193	vfs_ctx_inum_release( ctx , inum );
	194	return ENOMEM;
	195	}
	196
[23]	197	// allocate memory for VFS inode descriptor
[1]	198	req.type = KMEM_VFS_INODE;
	199	req.size = sizeof(vfs_inode_t);
	200	req.flags = AF_KERNEL \| AF_ZERO;
	201	inode = (vfs_inode_t *)kmem_alloc( &req );
	202
	203	if( inode == NULL )
	204	{
	205	printk("\n[ERROR] in %s : cannot allocate inode descriptor\n", __FUNCTION__ );
	206	vfs_ctx_inum_release( ctx , inum );
	207	mapper_destroy( mapper );
	208	return ENOMEM;
	209	}
	210
	211	// initialize inode descriptor
	212	inode->gc = 0;
[23]	213	inode->type = inode_type;
[1]	214	inode->inum = inum;
	215	inode->attr = attr;
[23]	216	inode->rights = rights;
[1]	217	inode->uid = uid;
	218	inode->gid = gid;
	219	inode->refcount = 0;
	220	inode->parent_xp = dentry_xp;
	221	inode->ctx = ctx;
[246]	222	inode->mapper = mapper;
[188]	223	inode->extend = extend;
[1]	224
[246]	225	// initialise inode field in mapper
	226	mapper->inode = inode;
	227
[1]	228	// initialise threads waiting queue
	229	xlist_root_init( XPTR( local_cxy , &inode->wait_root ) );
	230
[204]	231	// initialize dentries hash table
	232	xhtab_init( &inode->children , XHTAB_DENTRY_TYPE );
[1]	233
	234	// initialize inode locks
[10]	235	remote_rwlock_init( XPTR( local_cxy , &inode->data_lock ) );
[1]	236	remote_spinlock_init( XPTR( local_cxy , &inode->main_lock ) );
	237
[438]	238	#if DEBUG_VFS_INODE_CREATE
[436]	239	cycle = (uint32_t)hal_get_cycles();
[438]	240	if( DEBUG_VFS_INODE_CREATE < cycle )
[433]	241	printk("\n[DBG] %s : thread %x exit / inode = %x in cluster %x / cycle %d\n",
	242	__FUNCTION__, CURRENT_THREAD, inode, local_cxy, cycle );
	243	#endif
[401]	244
[1]	245	// return extended pointer on inode
	246	*inode_xp = XPTR( local_cxy , inode );
	247	return 0;
	248
	249	} // end vfs_inode_create()
	250
[459]	251	////////////////////////////////////////////////
	252	error_t vfs_inode_destroy( vfs_inode_t * inode )
[1]	253	{
[492]	254	assert( (inode->refcount == 0) , "inode refcount non zero\n" );
[1]	255
	256	// release memory allocated for mapper
	257	mapper_destroy( inode->mapper );
	258
	259	// release memory allocate for inode descriptor
	260	kmem_req_t req;
	261	req.ptr = inode;
	262	req.type = KMEM_VFS_INODE;
	263	kmem_free( &req );
	264
[459]	265	return 0;
	266
[1]	267	} // end vfs_inode_destroy()
	268
[238]	269	/////////////////////////////////////////////
	270	error_t vfs_inode_load( vfs_inode_t * parent,
	271	char * name,
	272	xptr_t child_xp )
	273	{
[246]	274
[438]	275	#if DEBUG_VFS_INODE_LOAD
[433]	276	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	277	if( DEBUG_VFS_INODE_LOAD < cycle )
[433]	278	printk("\n[DBG] %s : thread %x enter for <%s> / cycle %d\n",
	279	__FUNCTION__, CURRENT_THREAD , name , cycle );
	280	#endif
	281
[238]	282	error_t error = 0;
	283
[492]	284	assert( (parent != NULL) , "parent pointer is NULL\n");
[238]	285
[492]	286	assert( (child_xp != XPTR_NULL) , "child pointer is NULL\n");
[238]	287
	288	// get parent inode FS type
	289	vfs_fs_type_t fs_type = parent->ctx->type;
	290
	291	// call relevant FS function
	292	if( fs_type == FS_TYPE_FATFS )
	293	{
	294	error = fatfs_inode_load( parent , name , child_xp );
	295	}
	296	else if( fs_type == FS_TYPE_RAMFS )
	297	{
[492]	298	assert( false , "should not be called for RAMFS\n" );
[238]	299	}
	300	else if( fs_type == FS_TYPE_DEVFS )
	301	{
[492]	302	assert( false , "should not be called for DEVFS\n" );
[238]	303	}
	304	else
	305	{
[492]	306	assert( false , "undefined file system type\n" );
[238]	307	}
	308
[438]	309	#if DEBUG_VFS_INODE_LOAD
[433]	310	cycle = (uint32_t)hal_get_cycles();
[438]	311	if( DEBUG_VFS_INODE_LOAD < cycle )
[433]	312	printk("\n[DBG] %s : thread %x exit for <%s> / cycle %d\n",
	313	__FUNCTION__, CURRENT_THREAD , name , cycle );
	314	#endif
[246]	315
[238]	316	return error;
	317
[459]	318	} // end vfs_inode_load()
[238]	319
[1]	320	////////////////////////////////////////////
	321	void vfs_inode_remote_up( xptr_t inode_xp )
	322	{
	323	// get inode cluster and local pointer
	324	cxy_t inode_cxy = GET_CXY( inode_xp );
[473]	325	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
[1]	326
	327	hal_remote_atomic_add( XPTR( inode_cxy , &inode_ptr->refcount ) , 1 );
	328	}
	329
	330	//////////////////////////////////////////////
	331	void vfs_inode_remote_down( xptr_t inode_xp )
	332	{
	333	// get inode cluster and local pointer
	334	cxy_t inode_cxy = GET_CXY( inode_xp );
[473]	335	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
[1]	336
	337	hal_remote_atomic_add( XPTR( inode_cxy , &inode_ptr->refcount ) , -1 );
	338	}
	339
	340	//////////////////////////////////////////////
	341	uint32_t vfs_inode_get_size( xptr_t inode_xp )
	342	{
	343	// get inode cluster and local pointer
	344	cxy_t cxy = GET_CXY( inode_xp );
[473]	345	vfs_inode_t * ptr = GET_PTR( inode_xp );
[1]	346
	347	// get size
[10]	348	remote_rwlock_rd_lock( XPTR( cxy , &ptr->data_lock ) );
[1]	349	uint32_t size = hal_remote_lw( XPTR( cxy , &ptr->size ) );
[10]	350	remote_rwlock_rd_unlock( XPTR( cxy , &ptr->data_lock ) );
[1]	351	return size;
	352	}
	353
[101]	354	////////////////////////////////////////////
	355	void vfs_inode_set_size( xptr_t inode_xp,
[409]	356	uint32_t size )
[1]	357	{
	358	// get inode cluster and local pointer
	359	cxy_t cxy = GET_CXY( inode_xp );
[473]	360	vfs_inode_t * ptr = GET_PTR( inode_xp );
[1]	361
	362	// set size
[10]	363	remote_rwlock_wr_unlock( XPTR( cxy , &ptr->data_lock ) );
[1]	364	hal_remote_sw( XPTR( cxy , &ptr->size ) , size );
[10]	365	remote_rwlock_wr_unlock( XPTR( cxy , &ptr->data_lock ) );
[1]	366	}
	367
[101]	368	////////////////////////////////////////
	369	void vfs_inode_unlock( xptr_t inode_xp )
[1]	370	{
	371	// get inode cluster and local pointer
	372	cxy_t cxy = GET_CXY( inode_xp );
[473]	373	vfs_inode_t * ptr = GET_PTR( inode_xp );
[1]	374
	375	// release the main lock
	376	remote_spinlock_unlock( XPTR( cxy , &ptr->main_lock ) );
	377	}
	378
[101]	379	//////////////////////////////////////
	380	void vfs_inode_lock( xptr_t inode_xp )
[1]	381	{
	382	// get inode cluster and local pointer
	383	cxy_t cxy = GET_CXY( inode_xp );
[473]	384	vfs_inode_t * ptr = GET_PTR( inode_xp );
[1]	385
	386	// get the main lock
	387	remote_spinlock_lock( XPTR( cxy , &ptr->main_lock ) );
	388	}
	389
[101]	390	/////////////////////////////////////////
[409]	391	void vfs_inode_get_name( xptr_t inode_xp,
	392	char * name )
[101]	393	{
[204]	394	cxy_t inode_cxy;
	395	vfs_inode_t * inode_ptr;
	396	xptr_t dentry_xp;
	397	cxy_t dentry_cxy;
	398	vfs_dentry_t * dentry_ptr;
	399
	400	// get inode cluster and local pointer
	401	inode_cxy = GET_CXY( inode_xp );
[473]	402	inode_ptr = GET_PTR( inode_xp );
[204]	403
	404	// get parent dentry
	405	dentry_xp = hal_remote_lwd( XPTR( inode_cxy , &inode_ptr->parent_xp ) );
	406
	407	// get local copy of name
	408	if( dentry_xp == XPTR_NULL ) // it is the VFS root
	409	{
	410	strcpy( name , "/" );
	411	}
	412	else // not the VFS root
	413	{
	414	dentry_cxy = GET_CXY( dentry_xp );
[473]	415	dentry_ptr = GET_PTR( dentry_xp );
[204]	416
	417	hal_remote_strcpy( XPTR( local_cxy , name ) ,
	418	XPTR( dentry_cxy , &dentry_ptr->name ) );
	419	}
[409]	420	} // end vfs_inode_get_name()
[204]	421
	422	////////////////////////////////////////////////////////////////////////////////////////////
[1]	423	// Dentry related functions
	424	//////////////////////////////////////////////////////////////////////////////////////////
	425
[23]	426	///////////////////////////////////////////////////
	427	error_t vfs_dentry_create( vfs_fs_type_t fs_type,
	428	char * name,
	429	vfs_inode_t * parent,
	430	xptr_t * dentry_xp )
[1]	431	{
	432	vfs_ctx_t * ctx; // context descriptor
	433	vfs_dentry_t * dentry; // dentry descriptor (to be allocated)
	434	kmem_req_t req; // request to kernel memory allocator
[459]	435	error_t error;
[1]	436
[438]	437	#if DEBUG_VFS_DENTRY_CREATE
[433]	438	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	439	if( DEBUG_VFS_DENTRY_CREATE < cycle )
[459]	440	printk("\n[DBG] %s : thread %x in process %x enter for <%s> / parent_inode %x / cycle %d\n",
	441	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, name, parent, cycle );
[433]	442	#endif
[296]	443
[188]	444	// get pointer on context
[23]	445	if ( fs_type == FS_TYPE_FATFS ) ctx = &fs_context[FS_TYPE_FATFS];
	446	else if( fs_type == FS_TYPE_RAMFS ) ctx = &fs_context[FS_TYPE_RAMFS];
	447	else if( fs_type == FS_TYPE_DEVFS ) ctx = &fs_context[FS_TYPE_DEVFS];
[459]	448	else
[1]	449	{
	450	ctx = NULL;
[459]	451	return EINVAL;
[1]	452	}
	453
	454	// get name length
	455	uint32_t length = strlen( name );
	456
[459]	457	if( length >= CONFIG_VFS_MAX_NAME_LENGTH ) return EINVAL;
[437]	458
[1]	459	// allocate memory for dentry descriptor
	460	req.type = KMEM_VFS_DENTRY;
	461	req.size = sizeof(vfs_dentry_t);
	462	req.flags = AF_KERNEL \| AF_ZERO;
	463	dentry = (vfs_dentry_t *)kmem_alloc( &req );
	464
[459]	465	if( dentry == NULL ) return ENOMEM;
[437]	466
[1]	467	// initialize dentry descriptor
[23]	468
[1]	469	dentry->ctx = ctx;
	470	dentry->length = length;
	471	dentry->parent = parent;
	472	strcpy( dentry->name , name );
	473
[438]	474	#if( DEBUG_VFS_DENTRY_CREATE & 1 )
[437]	475	cycle = (uint32_t)hal_get_cycles();
[438]	476	if( DEBUG_VFS_DENTRY_CREATE < cycle )
[437]	477	printk("\n[DBG] %s : dentry initialised\n", __FUNCTION__ );
	478	#endif
	479
[23]	480	// register dentry in hash table rooted in parent inode
[459]	481	error = xhtab_insert( XPTR( local_cxy , &parent->children ),
	482	name,
	483	XPTR( local_cxy , &dentry->list ) );
[23]	484
[459]	485	if( error ) return EINVAL;
	486
[438]	487	#if( DEBUG_VFS_DENTRY_CREATE & 1 )
[437]	488	cycle = (uint32_t)hal_get_cycles();
[438]	489	if( DEBUG_VFS_DENTRY_CREATE < cycle )
[437]	490	printk("\n[DBG] %s : dentry registerd in htab\n", __FUNCTION__ );
	491	#endif
	492
[23]	493	// return extended pointer on dentry
[1]	494	*dentry_xp = XPTR( local_cxy , dentry );
	495
[438]	496	#if DEBUG_VFS_DENTRY_CREATE
[433]	497	cycle = (uint32_t)hal_get_cycles();
[438]	498	if( DEBUG_VFS_DENTRY_CREATE < cycle )
[459]	499	printk("\n[DBG] %s : thread %x in process %x exit for <%s> / dentry %x / cycle %d\n",
	500	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, name, dentry, cycle );
[433]	501	#endif
[296]	502
[1]	503	return 0;
	504
	505	} // end vfs_dentry_create()
	506
[459]	507	///////////////////////////////////////////////////
	508	error_t vfs_dentry_destroy( vfs_dentry_t * dentry )
[1]	509	{
[459]	510	error_t error;
[1]	511
[459]	512	assert( (dentry->refcount == 0) , __FUNCTION__ , "dentry refcount non zero\n" );
	513
	514	// get pointer on parent inode
	515	vfs_inode_t * parent = dentry->parent;
	516
	517	// remove this dentry from parent inode htab
	518	error = xhtab_remove( XPTR( local_cxy , &parent->children ),
	519	dentry->name,
	520	XPTR( local_cxy , &dentry->list ) );
	521
	522	if( error ) return EINVAL;
	523
	524	// release memory allocated to dentry
[1]	525	kmem_req_t req;
	526	req.ptr = dentry;
	527	req.type = KMEM_VFS_DENTRY;
	528	kmem_free( &req );
[459]	529
	530	return 0;
[1]	531	}
	532
	533
[188]	534
[1]	535	//////////////////////////////////////////////////////////////////////////////////////////
	536	// File descriptor related functions
	537	//////////////////////////////////////////////////////////////////////////////////////////
	538
[23]	539	/////////////////////////////////////////////
	540	error_t vfs_file_create( vfs_inode_t * inode,
	541	uint32_t attr,
	542	xptr_t * file_xp )
	543	{
	544	vfs_file_t * file;
	545	kmem_req_t req;
	546
	547	// allocate memory for new file descriptor
	548	req.type = KMEM_VFS_FILE;
	549	req.size = sizeof(vfs_file_t);
	550	req.flags = AF_KERNEL \| AF_ZERO;
	551	file = (vfs_file_t *)kmem_alloc( &req );
	552
	553	if( file == NULL ) return ENOMEM;
	554
	555	// initializes new file descriptor
	556	file->gc = 0;
	557	file->type = inode->type;
	558	file->attr = attr;
	559	file->offset = 0;
[337]	560	file->refcount = 1;
[23]	561	file->inode = inode;
	562	file->ctx = inode->ctx;
	563	file->mapper = inode->mapper;
	564
	565	remote_rwlock_init( XPTR( local_cxy , &file->lock ) );
	566
	567	*file_xp = XPTR( local_cxy , file );
[459]	568
	569	#if DEBUG_VFS_OPEN
	570	uint32_t cycle = (uint32_t)hal_get_cycles();
	571	if( DEBUG_VFS_OPEN < cycle )
	572	printk("\n[DBG] %s : thread %x in process %x created file %x in cluster %x / cycle %d\n",
	573	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, file, local_cxy, cycle );
	574	#endif
	575
[23]	576	return 0;
	577
	578	} // end vfs_file_create()
	579
	580	///////////////////////////////////////////
	581	void vfs_file_destroy( vfs_file_t * file )
	582	{
	583	if( file->refcount )
	584	{
[492]	585	assert( false , "refcount non zero\n" );
[23]	586	}
	587
	588	kmem_req_t req;
	589	req.ptr = file;
	590	req.type = KMEM_VFS_FILE;
	591	kmem_free( &req );
	592
[459]	593	#if DEBUG_VFS_CLOSE
	594	uint32_t cycle = (uint32_t)hal_get_cycles();
	595	if( DEBUG_VFS_CLOSE < cycle )
	596	printk("\n[DBG] %s : thread %x in process %x deleted file %x in cluster %x / cycle %d\n",
	597	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, file, local_cxy, cycle );
	598	#endif
	599
[23]	600	} // end vfs_file_destroy()
	601
	602
[1]	603	////////////////////////////////////////
	604	void vfs_file_count_up( xptr_t file_xp )
	605	{
	606	// get file cluster and local pointer
	607	cxy_t file_cxy = GET_CXY( file_xp );
[459]	608	vfs_file_t * file_ptr = GET_PTR( file_xp );
[1]	609
	610	// atomically increment count
	611	hal_remote_atomic_add( XPTR( file_cxy , &file_ptr->refcount ) , 1 );
	612	}
	613
	614	//////////////////////////////////////////
	615	void vfs_file_count_down( xptr_t file_xp )
	616	{
	617	// get file cluster and local pointer
	618	cxy_t file_cxy = GET_CXY( file_xp );
[459]	619	vfs_file_t * file_ptr = GET_PTR( file_xp );
[1]	620
	621	// atomically decrement count
	622	hal_remote_atomic_add( XPTR( file_cxy , &file_ptr->refcount ) , -1 );
	623	}
	624
[23]	625	//////////////////////////////////////////////////////////////////////////////////////////
	626	// File access related functions
	627	//////////////////////////////////////////////////////////////////////////////////////////
	628
[407]	629	//////////////////////////////////////
	630	error_t vfs_open( process_t * process,
	631	char * path,
	632	uint32_t flags,
	633	uint32_t mode,
	634	xptr_t * new_file_xp,
	635	uint32_t * new_file_id )
[1]	636	{
[23]	637	error_t error;
	638	xptr_t inode_xp; // extended pointer on target inode
	639	cxy_t inode_cxy; // inode cluster identifier
	640	vfs_inode_t * inode_ptr; // inode local pointer
	641	uint32_t file_attr; // file descriptor attributes
	642	uint32_t lookup_mode; // lookup working mode
	643	xptr_t file_xp; // extended pointer on created file descriptor
	644	uint32_t file_id; // created file descriptor index in reference fd_array
[1]	645
[473]	646	assert( (mode == 0), __FUNCTION__,
	647	"the mode parameter is not supported yet\n" );
	648
[438]	649	#if DEBUG_VFS_OPEN
[433]	650	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	651	if( DEBUG_VFS_OPEN < cycle )
[459]	652	printk("\n[DBG] %s : thread %x in process %x enter for <%s> / cycle %d\n",
	653	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, path, cycle );
[433]	654	#endif
[101]	655
[23]	656	// compute lookup working mode
	657	lookup_mode = VFS_LOOKUP_OPEN;
	658	if( (flags & O_DIR ) ) lookup_mode \|= VFS_LOOKUP_DIR;
	659	if( (flags & O_CREAT ) ) lookup_mode \|= VFS_LOOKUP_CREATE;
	660	if( (flags & O_EXCL ) ) lookup_mode \|= VFS_LOOKUP_EXCL;
	661
	662	// compute attributes for the created file
	663	file_attr = 0;
[407]	664	if( (flags & O_RDONLY ) == 0 ) file_attr \|= FD_ATTR_WRITE_ENABLE;
	665	if( (flags & O_WRONLY ) == 0 ) file_attr \|= FD_ATTR_READ_ENABLE;
[23]	666	if( (flags & O_SYNC ) ) file_attr \|= FD_ATTR_SYNC;
	667	if( (flags & O_APPEND ) ) file_attr \|= FD_ATTR_APPEND;
	668	if( (flags & O_CLOEXEC) ) file_attr \|= FD_ATTR_CLOSE_EXEC;
[1]	669
[23]	670	// get extended pointer on target inode
[407]	671	error = vfs_lookup( process->vfs_cwd_xp , path , lookup_mode , &inode_xp );
[23]	672
	673	if( error ) return error;
	674
	675	// get target inode cluster and local pointer
	676	inode_cxy = GET_CXY( inode_xp );
[473]	677	inode_ptr = GET_PTR( inode_xp );
[23]	678
	679	// create a new file descriptor in cluster containing inode
	680	if( inode_cxy == local_cxy ) // target cluster is local
[1]	681	{
[23]	682	error = vfs_file_create( inode_ptr , file_attr , &file_xp );
[1]	683	}
[23]	684	else // target cluster is remote
	685	{
	686	rpc_vfs_file_create_client( inode_cxy , inode_ptr , file_attr , &file_xp , &error );
	687	}
[1]	688
[23]	689	if( error ) return error;
[1]	690
[407]	691	// allocate and register a new file descriptor index in reference process
	692	error = process_fd_register( process , file_xp , &file_id );
[1]	693
[23]	694	if( error ) return error;
[1]	695
[438]	696	#if DEBUG_VFS_OPEN
[433]	697	cycle = (uint32_t)hal_get_cycles();
[438]	698	if( DEBUG_VFS_OPEN < cycle )
[459]	699	printk("\n[DBG] %s : thread %x in process %x exit for <%s> / fdid %d / cluster %x / cycle %d\n",
	700	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, path,
	701	file_id, GET_CXY( file_xp ), cycle );
[433]	702	#endif
[238]	703
[23]	704	// success
	705	*new_file_xp = file_xp;
	706	*new_file_id = file_id;
	707	return 0;
[1]	708
[23]	709	} // end vfs_open()
	710
[407]	711	//////////////////////////////////////
	712	int vfs_user_move( bool_t to_buffer,
	713	xptr_t file_xp,
	714	void * buffer,
	715	uint32_t size )
[23]	716	{
[492]	717	assert( ( file_xp != XPTR_NULL ) , "file_xp == XPTR_NULL" );
[23]	718
	719	cxy_t file_cxy; // remote file descriptor cluster
	720	vfs_file_t * file_ptr; // remote file descriptor local pointer
	721	vfs_inode_type_t inode_type;
	722	uint32_t file_offset; // current offset in file
	723	mapper_t * mapper;
	724	error_t error;
	725
	726	// get cluster and local pointer on remote file descriptor
	727	file_cxy = GET_CXY( file_xp );
[473]	728	file_ptr = GET_PTR( file_xp );
[23]	729
	730	// get inode type from remote file descriptor
	731	inode_type = hal_remote_lw( XPTR( file_cxy , &file_ptr->type ) );
	732
[492]	733	assert( (inode_type == INODE_TYPE_FILE) ,
[407]	734	"inode type is not INODE_TYPE_FILE" );
[23]	735
[407]	736	// get mapper pointer and file offset from file descriptor
	737	file_offset = hal_remote_lw( XPTR( file_cxy , &file_ptr->offset ) );
	738	mapper = (mapper_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->mapper ) );
[23]	739
[407]	740	// move data between mapper and buffer
	741	if( file_cxy == local_cxy )
	742	{
	743	error = mapper_move_user( mapper,
	744	to_buffer,
	745	file_offset,
	746	buffer,
	747	size );
[23]	748	}
[407]	749	else
[23]	750	{
[407]	751	rpc_mapper_move_buffer_client( file_cxy,
	752	mapper,
	753	to_buffer,
	754	true, // user buffer
	755	file_offset,
	756	(uint64_t)(intptr_t)buffer,
	757	size,
	758	&error );
	759	}
	760
	761	if( error ) return -1;
	762	else return size;
	763
[313]	764	} // end vfs_user_move()
[23]	765
[317]	766	////////////////////////////////////////////
	767	error_t vfs_kernel_move( bool_t to_buffer,
	768	xptr_t file_xp,
	769	xptr_t buffer_xp,
	770	uint32_t size )
	771	{
[492]	772	assert( ( file_xp != XPTR_NULL ) , "file_xp == XPTR_NULL" );
[317]	773
	774	cxy_t file_cxy; // remote file descriptor cluster
	775	vfs_file_t * file_ptr; // remote file descriptor local pointer
	776	vfs_inode_type_t inode_type;
	777	uint32_t file_offset; // current offset in file
	778	mapper_t * mapper;
	779	error_t error;
	780
	781	// get cluster and local pointer on remote file descriptor
	782	file_cxy = GET_CXY( file_xp );
[473]	783	file_ptr = GET_PTR( file_xp );
[317]	784
	785	// get inode type from remote file descriptor
	786	inode_type = hal_remote_lw( XPTR( file_cxy , &file_ptr->type ) );
	787
	788	// action depends on inode type
	789	if( inode_type == INODE_TYPE_FILE )
	790	{
	791	// get mapper pointer and file offset from file descriptor
	792	file_offset = hal_remote_lw( XPTR( file_cxy , &file_ptr->offset ) );
	793	mapper = (mapper_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->mapper ) );
	794
	795	// move data between mapper and buffer
	796	if( file_cxy == local_cxy )
	797	{
	798	error = mapper_move_kernel( mapper,
	799	to_buffer,
	800	file_offset,
	801	buffer_xp,
	802	size );
	803	}
	804	else
	805	{
	806	rpc_mapper_move_buffer_client( file_cxy,
	807	mapper,
	808	to_buffer,
	809	false, // kernel buffer
	810	file_offset,
	811	buffer_xp,
	812	size,
	813	&error );
	814	}
	815
	816	if( error ) return -1;
	817	else return 0;
	818	}
	819	else
	820	{
	821	printk("\n[ERROR] in %s : inode is not a file", __FUNCTION__ );
	822	return -1;
	823	}
	824	} // end vfs_kernel_move()
	825
[23]	826	//////////////////////////////////////
	827	error_t vfs_lseek( xptr_t file_xp,
	828	uint32_t offset,
	829	uint32_t whence,
	830	uint32_t * new_offset )
	831	{
[266]	832	xptr_t offset_xp;
	833	xptr_t lock_xp;
	834	cxy_t file_cxy;
	835	vfs_file_t * file_ptr;
	836	vfs_inode_t * inode_ptr;
	837	uint32_t new;
	838
[492]	839	assert( (file_xp != XPTR_NULL) , "file_xp == XPTR_NULL" );
[266]	840
	841	// get cluster and local pointer on remote file descriptor
	842	file_cxy = GET_CXY( file_xp );
[473]	843	file_ptr = GET_PTR( file_xp );
[266]	844
	845	// build extended pointers on lock and offset
	846	offset_xp = XPTR( file_cxy , &file_ptr->offset );
	847	lock_xp = XPTR( file_cxy , &file_ptr->lock );
	848
	849	// take file descriptor lock
	850	remote_rwlock_wr_lock( lock_xp );
	851
	852	if ( whence == SEEK_CUR ) // new = current + offset
	853	{
	854	new = hal_remote_lw( offset_xp ) + offset;
	855	}
	856	else if ( whence == SEEK_SET ) // new = offset
	857	{
	858	new = offset;
	859	}
	860	else if ( whence == SEEK_END ) // new = size + offset
	861	{
	862	// get local pointer on remote inode
	863	inode_ptr = (vfs_inode_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
	864
	865	new = hal_remote_lw( XPTR( file_cxy , &inode_ptr->size ) ) + offset;
	866	}
	867	else
	868	{
	869	printk("\n[ERROR] in %s : illegal whence value\n", __FUNCTION__ );
	870	remote_rwlock_wr_unlock( lock_xp );
	871	return -1;
	872	}
	873
	874	// set new offset
	875	hal_remote_sw( offset_xp , new );
	876
	877	// release file descriptor lock
	878	remote_rwlock_wr_unlock( lock_xp );
	879
	880	// success
[271]	881	if ( new_offset != NULL )
	882	*new_offset = new;
[1]	883	return 0;
	884
[23]	885	} // vfs_lseek()
	886
	887	///////////////////////////////////
	888	error_t vfs_close( xptr_t file_xp,
	889	uint32_t file_id )
[1]	890	{
[459]	891	cluster_t * cluster; // local pointer on local cluster
	892	cxy_t file_cxy; // cluster containing the file descriptor.
	893	vfs_file_t * file_ptr; // local ponter on file descriptor
	894	cxy_t owner_cxy; // process owner cluster
	895	lpid_t lpid; // process local index
	896	xptr_t root_xp; // root of list of process copies
	897	xptr_t lock_xp; // lock protecting the list of copies
	898	xptr_t iter_xp; // iterator on list of process copies
	899	xptr_t process_xp; // extended pointer on one process copy
	900	cxy_t process_cxy; // process copy cluster
	901	process_t * process_ptr; // process copy local pointer
	902
[492]	903	assert( (file_xp != XPTR_NULL) , "file_xp == XPTR_NULL" );
[23]	904
[492]	905	assert( (file_id < CONFIG_PROCESS_FILE_MAX_NR) , "illegal file_id" );
[23]	906
	907	thread_t * this = CURRENT_THREAD;
	908	process_t * process = this->process;
	909
[459]	910	#if DEBUG_VFS_CLOSE
	911	uint32_t cycle = (uint32_t)hal_get_cycles();
	912	if( DEBUG_VFS_CLOSE < cycle )
	913	printk("\n[DBG] %s : thread %x in process %x enter / fdid %d / cycle %d\n",
	914	__FUNCTION__, this->trdid, process->pid, file_id, cycle );
	915	#endif
[1]	916
[23]	917	// get local pointer on local cluster manager
[459]	918	cluster = LOCAL_CLUSTER;
[23]	919
	920	// get owner process cluster and lpid
[459]	921	owner_cxy = CXY_FROM_PID( process->pid );
	922	lpid = LPID_FROM_PID( process->pid );
[23]	923
	924	// get extended pointers on copies root and lock
[459]	925	root_xp = XPTR( owner_cxy , &cluster->pmgr.copies_root[lpid] );
	926	lock_xp = XPTR( owner_cxy , &cluster->pmgr.copies_lock[lpid] );
[23]	927
[459]	928	// 1) loop on the process descriptor copies to reset all fd_array[file_id] entries
	929
	930	// take the lock protecting the list of copies
[23]	931	remote_spinlock_lock( lock_xp );
	932
	933	XLIST_FOREACH( root_xp , iter_xp )
[1]	934	{
[459]	935	process_xp = XLIST_ELEMENT( iter_xp , process_t , copies_list );
	936	process_cxy = GET_CXY( process_xp );
	937	process_ptr = GET_PTR( process_xp );
[1]	938
[459]	939	#if (DEBUG_VFS_CLOSE & 1 )
	940	if( DEBUG_VFS_CLOSE < cycle )
	941	printk("\n[DBG] %s : reset fd_array[%d] for process %x in cluster %x\n",
	942	__FUNCTION__, file_id, process_ptr, process_cxy );
	943	#endif
[23]	944
[459]	945	// fd_array lock is required for atomic write of a 64 bits word
	946	// xptr_t fd_array_lock_xp = XPTR( process_cxy , &process_ptr->fd_array.lock );
	947
	948	xptr_t entry_xp = XPTR( process_cxy , &process_ptr->fd_array.array[file_id] );
	949
	950	// remote_rwlock_wr_lock( fd_array_lock_xp );
	951
[23]	952	hal_remote_swd( entry_xp , XPTR_NULL );
[459]	953
	954	// remote_rwlock_wr_unlock( fd_array_lock_xp );
[23]	955
[459]	956	vfs_file_count_down( file_xp );
	957
[124]	958	hal_fence();
[23]	959	}
	960
[459]	961	// release the lock protecting the list of copies
	962	remote_spinlock_unlock( lock_xp );
	963
	964	#if (DEBUG_VFS_CLOSE & 1)
	965	if( DEBUG_VFS_CLOSE < cycle )
	966	printk("\n[DBG] %s : thread %x in process %x reset all fd-array copies\n",
	967	__FUNCTION__, this->trdid, process->pid );
	968	#endif
	969
[23]	970	// 2) release memory allocated to file descriptor in remote cluster
[459]	971
	972	// get cluster and local pointer on remote file descriptor
	973	file_cxy = GET_CXY( file_xp );
	974	file_ptr = GET_PTR( file_xp );
	975
[23]	976	if( file_cxy == local_cxy ) // file cluster is local
[1]	977	{
[23]	978	vfs_file_destroy( file_ptr );
	979	}
	980	else // file cluster is local
	981	{
	982	rpc_vfs_file_destroy_client( file_cxy , file_ptr );
	983	}
[1]	984
[459]	985	#if DEBUG_VFS_CLOSE
	986	cycle = (uint32_t)hal_get_cycles();
	987	if( DEBUG_VFS_CLOSE < cycle )
	988	printk("\n[DBG] %s : thread %x in process %x exit / fdid %d closed / cycle %d\n",
	989	__FUNCTION__, this->trdid, process->pid, file_id, cycle );
	990	#endif
	991
[23]	992	return 0;
[1]	993
[23]	994	} // end vfs_close()
[1]	995
	996	////////////////////////////////////
[23]	997	error_t vfs_unlink( xptr_t cwd_xp,
	998	char * path )
[1]	999	{
[492]	1000	assert( false , "not implemented cwd_xp %x, path <%s> \n",
	1001	cwd_xp, path );
[1]	1002	return 0;
[407]	1003	}
[1]	1004
[407]	1005	////////////////////////////////////////
	1006	error_t vfs_stat( xptr_t file_xp,
	1007	struct stat * k_stat )
[1]	1008	{
[492]	1009	assert( false , "not implemented file_xp: %x, k_stat ptr %x\n",
	1010	file_xp, k_stat );
[1]	1011	return 0;
	1012	}
	1013
[407]	1014	/////////////////////////////////////////////
	1015	error_t vfs_readdir( xptr_t file_xp,
	1016	struct dirent * k_dirent )
[1]	1017	{
[492]	1018	assert( false , "not implemented file_xp: %x, k_dirent ptr %x\n",
	1019	file_xp, k_dirent );
[1]	1020	return 0;
	1021	}
	1022
	1023	//////////////////////////////////////
[23]	1024	error_t vfs_mkdir( xptr_t file_xp,
	1025	char * path,
	1026	uint32_t mode )
[1]	1027	{
[492]	1028	assert( false , "not implemented file_xp: %x, path <%s>, mode: %x\n",
	1029	file_xp, path, mode );
[1]	1030	return 0;
	1031	}
	1032
[23]	1033	////////////////////////////////////
	1034	error_t vfs_rmdir( xptr_t file_xp,
	1035	char * path )
[1]	1036	{
[492]	1037	assert( false , "not implemented file_xp: %x, path <%s>\n",
	1038	file_xp, path );
[1]	1039	return 0;
	1040	}
	1041
[23]	1042	///////////////////////////////////
	1043	error_t vfs_chdir( xptr_t cwd_xp,
	1044	char * path )
[1]	1045	{
[23]	1046	error_t error;
	1047	xptr_t inode_xp; // extended pointer on target inode
	1048	cxy_t inode_cxy; // target inode cluster identifier
	1049	vfs_inode_t * inode_ptr; // target inode local pointer
	1050	uint32_t mode; // lookup working mode
	1051	vfs_inode_type_t inode_type; // target inode type
	1052
	1053	// set lookup working mode
	1054	mode = 0;
	1055
	1056	// get extended pointer on target inode
	1057	error = vfs_lookup( cwd_xp , path , mode , &inode_xp );
	1058
	1059	if( error ) return error;
	1060
	1061	// get inode cluster and local pointer
	1062	inode_cxy = GET_CXY( inode_xp );
[473]	1063	inode_ptr = GET_PTR( inode_xp );
[23]	1064
	1065	// get inode type from remote file
	1066	inode_type = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->type ) );
	1067
	1068	if( inode_type != INODE_TYPE_DIR )
	1069	{
	1070	CURRENT_THREAD->errno = ENOTDIR;
	1071	return -1;
	1072	}
	1073
[492]	1074	assert( false , "not implemented\n" );
[1]	1075	return 0;
	1076	}
	1077
[23]	1078	///////////////////////////////////
	1079	error_t vfs_chmod( xptr_t cwd_xp,
	1080	char * path,
	1081	uint32_t rights )
[1]	1082	{
[23]	1083	error_t error;
	1084	xptr_t inode_xp; // extended pointer on target inode
	1085	cxy_t inode_cxy; // inode cluster identifier
	1086	vfs_inode_t * inode_ptr; // inode local pointer
	1087	vfs_inode_type_t inode_type; // target inode type
	1088
	1089	// set lookup working mode
[473]	1090	assert( (rights == 0), __FUNCTION__,
	1091	"access rights non implemented yet\n" );
[23]	1092
	1093	// get extended pointer on target inode
[473]	1094	error = vfs_lookup( cwd_xp , path , 0 , &inode_xp );
[23]	1095
	1096	if( error ) return error;
	1097
	1098	// get inode cluster and local pointer
	1099	inode_cxy = GET_CXY( inode_xp );
[473]	1100	inode_ptr = GET_PTR( inode_xp );
[23]	1101
	1102	// get inode type from remote inode
	1103	inode_type = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->type ) );
	1104
	1105
[492]	1106	assert( false , "not implemented\n" );
[1]	1107	return 0;
	1108	}
	1109
[23]	1110	///////////////////////////////////
	1111	error_t vfs_mkfifo( xptr_t cwd_xp,
	1112	char * path,
	1113	uint32_t rights )
	1114	{
[492]	1115	assert( false , "not implemented cwd_xp: %x, path <%s>, rights %x\n",
	1116	cwd_xp, path, rights );
[23]	1117	return 0;
	1118	}
[1]	1119
	1120
	1121
[188]	1122	//////////////////////////////////////////////////////////////////////////////////////////
[1]	1123	// Inode Tree functions
	1124	//////////////////////////////////////////////////////////////////////////////////////////
	1125
[188]	1126	/////////////////////////////////
[484]	1127	cxy_t vfs_cluster_random_select( void )
[188]	1128	{
[530]	1129	uint32_t x_max = LOCAL_CLUSTER->x_max; // [FIXME]
	1130	uint32_t y_max = LOCAL_CLUSTER->y_max; // [FIXME]
[188]	1131	uint32_t y_width = LOCAL_CLUSTER->y_width;
[530]	1132	uint32_t index = ( hal_get_cycles() + hal_get_gid() ) % (x_max * y_max); // [FIXME]
	1133	uint32_t x = index / y_max; // [FIXME]
	1134	uint32_t y = index % y_max; // [FIXME]
[188]	1135
	1136	return (x<<y_width) + y;
	1137	}
	1138
	1139
	1140	//////////////////////////////////////////////////////////////////////////
	1141	// This static function is called by the vfs_display() function.
[337]	1142	// that is supposed to take the TXT0 lock.
[188]	1143	//////////////////////////////////////////////////////////////////////////
	1144	static void vfs_recursive_display( xptr_t inode_xp,
	1145	xptr_t name_xp,
	1146	uint32_t indent )
	1147	{
	1148	cxy_t inode_cxy;
	1149	vfs_inode_t * inode_ptr;
	1150	vfs_inode_type_t inode_type;
[204]	1151	xptr_t children_xp; // extended pointer on children xhtab
[188]	1152
[204]	1153	xptr_t child_dentry_xp;
	1154	cxy_t child_dentry_cxy;
	1155	vfs_dentry_t * child_dentry_ptr;
	1156	xptr_t child_inode_xp;
	1157	xptr_t child_dentry_name_xp;
[188]	1158
	1159	char name[CONFIG_VFS_MAX_NAME_LENGTH];
	1160
	1161	char * indent_str[] = { "", // level 0
	1162	" ", // level 1
	1163	" ", // level 2
	1164	" ", // level 3
	1165	" ", // level 4
	1166	" ", // level 5
	1167	" ", // level 6
	1168	" ", // level 7
	1169	" ", // level 8
	1170	" ", // level 9
	1171	" ", // level 10
	1172	" ", // level 11
	1173	" ", // level 12
	1174	" ", // level 13
	1175	" ", // level 14
	1176	" " }; // level 15
	1177
[492]	1178	assert( (inode_xp != XPTR_NULL) , "inode_xp cannot be NULL\n" );
	1179	assert( (name_xp != XPTR_NULL) , "name_xp cannot be NULL\n" );
	1180	assert( (indent < 16) , "depth cannot be larger than 15\n" );
[188]	1181
	1182	// get inode cluster and local pointer
	1183	inode_cxy = GET_CXY( inode_xp );
[473]	1184	inode_ptr = GET_PTR( inode_xp );
[188]	1185
	1186	// get inode type
	1187	inode_type = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->type ) );
	1188
[367]	1189	// get local pointer on associated mapper
	1190	mapper_t * mapper_ptr = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
	1191
[188]	1192	// make a local copy of node name
	1193	hal_remote_strcpy( XPTR( local_cxy , name ) , name_xp );
	1194
	1195	// display inode
[407]	1196	nolock_printk("%s%s <%s> : inode = %x / mapper = %x / cluster %x\n",
[367]	1197	indent_str[indent], vfs_inode_type_str( inode_type ), name,
[407]	1198	inode_ptr , mapper_ptr , inode_cxy );
[188]	1199
	1200	// scan directory entries
	1201	if( inode_type == INODE_TYPE_DIR )
	1202	{
	1203	// get extended pointer on directory entries xhtab
[204]	1204	children_xp = XPTR( inode_cxy , &inode_ptr->children );
[188]	1205
	1206	// get xhtab lock
[204]	1207	xhtab_read_lock( children_xp );
[188]	1208
	1209	// get first dentry from xhtab
[204]	1210	child_dentry_xp = xhtab_get_first( children_xp );
[188]	1211
[204]	1212	while( child_dentry_xp != XPTR_NULL )
[188]	1213	{
	1214	// get dentry cluster and local pointer
[204]	1215	child_dentry_cxy = GET_CXY( child_dentry_xp );
[473]	1216	child_dentry_ptr = GET_PTR( child_dentry_xp );
[188]	1217
	1218	// get extended pointer on child inode
[204]	1219	child_inode_xp = hal_remote_lwd( XPTR( child_dentry_cxy,
	1220	&child_dentry_ptr->child_xp ) );
[188]	1221
	1222	// get extended pointer on dentry name
[204]	1223	child_dentry_name_xp = XPTR( child_dentry_cxy , &child_dentry_ptr->name );
[188]	1224
	1225	// recursive call on child inode
[204]	1226	vfs_recursive_display( child_inode_xp,
	1227	child_dentry_name_xp,
	1228	indent+1 );
[188]	1229
	1230	// get next dentry
[204]	1231	child_dentry_xp = xhtab_get_next( children_xp );
[188]	1232	}
	1233
	1234	// release xhtab lock
[204]	1235	xhtab_read_unlock( children_xp );
[188]	1236	}
	1237	} // end vfs_recursive_display()
	1238
	1239	///////////////////////////////////
	1240	void vfs_display( xptr_t inode_xp )
	1241	{
[204]	1242	xptr_t name_xp;
[188]	1243	xptr_t dentry_xp;
	1244	cxy_t dentry_cxy;
	1245	vfs_dentry_t * dentry_ptr;
[337]	1246	uint32_t save_sr;
[188]	1247
	1248	// get target inode cluster and local pointer
	1249	cxy_t inode_cxy = GET_CXY( inode_xp );
[473]	1250	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
[188]	1251
	1252	// get extended pointer on associated dentry
[367]	1253	dentry_xp = hal_remote_lwd( XPTR( inode_cxy , &inode_ptr->parent_xp ) );
[188]	1254
	1255	// check if target inode is the File System root
	1256	if( dentry_xp == XPTR_NULL )
	1257	{
	1258	// build extended pointer on root name
	1259	name_xp = XPTR( local_cxy , "/" );
	1260	}
	1261	else
	1262	{
	1263	// get dentry cluster and local pointer
	1264	dentry_cxy = GET_CXY( dentry_xp );
[473]	1265	dentry_ptr = GET_PTR( dentry_xp );
[188]	1266
	1267	// get extended pointer on dentry name
	1268	name_xp = XPTR( dentry_cxy , &dentry_ptr->name );
	1269	}
	1270
[337]	1271	// get pointers on TXT0 chdev
[407]	1272	xptr_t txt0_xp = chdev_dir.txt_tx[0];
[337]	1273	cxy_t txt0_cxy = GET_CXY( txt0_xp );
	1274	chdev_t * txt0_ptr = GET_PTR( txt0_xp );
	1275
	1276	// get extended pointer on remote TXT0 chdev lock
	1277	xptr_t lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
	1278
	1279	// get TXT0 lock in busy waiting mode
	1280	remote_spinlock_lock_busy( lock_xp , &save_sr );
	1281
[188]	1282	// print header
[401]	1283	nolock_printk("\n***** file system state\n\n");
[188]	1284
	1285	// call recursive function
[473]	1286	vfs_recursive_display( inode_xp , name_xp , 0 );
[188]	1287
[337]	1288	// release lock
	1289	remote_spinlock_unlock_busy( lock_xp , save_sr );
	1290
[204]	1291	} // end vfs_display()
[188]	1292
[1]	1293	//////////////////////////////////////////////////////////////////////////////////////////
[23]	1294	// This function is used by the vfs_lookup() function.
[1]	1295	// It takes an extended pointer on a remote inode (parent directory inode),
	1296	// and check access_rights violation for the calling thread.
	1297	// It can be used by any thread running in any cluster.
	1298	//////////////////////////////////////////////////////////////////////////////////////////
	1299	// @ inode_xp : extended pointer on inode.
	1300	// @ client_uid : client thread user ID
	1301	// @ client_gid : client thread group ID
	1302	// @ return true if access rights are violated.
	1303	//////////////////////////////////////////////////////////////////////////////////////////
	1304	bool_t vfs_access_denied( xptr_t inode_xp,
	1305	uint32_t client_uid,
	1306	uint32_t client_gid )
	1307	{
	1308	// get found inode cluster and local pointer
	1309	cxy_t inode_cxy = GET_CXY( inode_xp );
[473]	1310	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
[1]	1311
	1312	// get inode access mode, UID, and GID
	1313	// TODO uint32_t mode = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->mode ) );
	1314	uid_t uid = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->uid ) );
	1315	gid_t gid = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->gid ) );
	1316
	1317	// FIXME : me must use mode
	1318	if( (uid == client_uid) \|\| (gid == client_gid) ) return false;
	1319	else return true;
	1320	}
	1321
	1322	//////////////////////////////////////////////////////////////////////////////////////////
	1323	// This static function is used by the vfs_lookup() function.
[204]	1324	// It takes an extended pointer on a remote parent directory inode, a directory
[1]	1325	// entry name, and returns an extended pointer on the child inode.
	1326	// It can be used by any thread running in any cluster.
	1327	//////////////////////////////////////////////////////////////////////////////////////////
	1328	// @ parent_xp : extended pointer on parent inode in remote cluster.
	1329	// @ name : dentry name
	1330	// @ child_xp : [out] buffer for extended pointer on child inode.
	1331	// @ return true if success / return false if not found.
	1332	//////////////////////////////////////////////////////////////////////////////////////////
	1333	static bool_t vfs_get_child( xptr_t parent_xp,
	1334	char * name,
	1335	xptr_t * child_xp )
	1336	{
	1337	xptr_t xhtab_xp; // extended pointer on hash table containing children dentries
	1338	xptr_t dentry_xp; // extended pointer on children dentry
	1339
	1340	// get parent inode cluster and local pointer
	1341	cxy_t parent_cxy = GET_CXY( parent_xp );
[473]	1342	vfs_inode_t * parent_ptr = GET_PTR( parent_xp );
[1]	1343
	1344	// get extended pointer on hash table of children directory entries
	1345	xhtab_xp = XPTR( parent_cxy , &parent_ptr->children );
	1346
	1347	// search extended pointer on matching dentry
	1348	dentry_xp = xhtab_lookup( xhtab_xp , name );
	1349
	1350	if( dentry_xp == XPTR_NULL ) return false;
	1351
	1352	// get dentry cluster and local pointer
	1353	cxy_t dentry_cxy = GET_CXY( dentry_xp );
[473]	1354	vfs_dentry_t * dentry_ptr = GET_PTR( dentry_xp );
[1]	1355
	1356	// return child inode
[101]	1357	*child_xp = (xptr_t)hal_remote_lwd( XPTR( dentry_cxy , &dentry_ptr->child_xp ) );
[1]	1358	return true;
	1359
[204]	1360	} // end vfs_get_child()
	1361
[1]	1362	//////////////////////////////////////////////////////////////////////////////////////////
	1363	// This static function is used by the vfs_lookup() function.
	1364	// It takes the <current> pointer on a buffer containing a complete pathname, and return
	1365	// in the <name> buffer, allocated by the caller, a single name in the path.
	1366	// It return also in the <next> pointer the next character to analyse in the path.
	1367	// Finally it returns a <last> boolean, that is true when the returned <name> is the
	1368	// last name in the path. The names are supposed to be separated by one or several '/'
	1369	// characters, that are not written in the <name> buffer.
	1370	//////////////////////////////////////////////////////////////////////////////////////////
	1371	// @ current : pointer on first character to analyse in buffer containing the path.
	1372	// @ name : [out] pointer on buffer allocated by the caller for the returned name.
	1373	// @ next : [out] pointer on next character to analyse in buffer containing the path.
	1374	// @ last : [out] true if the returned name is the last (NUL character found).
	1375	// @ return 0 if success / return EINVAL if string empty (first chracter is NUL).
	1376	//////////////////////////////////////////////////////////////////////////////////////////
	1377	static error_t vfs_get_name_from_path( char * current,
	1378	char * name,
	1379	char ** next,
	1380	bool_t * last )
	1381	{
	1382	char * ptr = current;
	1383
	1384	// skip leading '/' characters
	1385	while( *ptr == '/' ) ptr++;
	1386
	1387	// return EINVAL if string empty
	1388	if( *ptr == 0 ) return EINVAL;
	1389
	1390	// copy all characters in name until NUL or '/'
	1391	while( (ptr != 0) && (ptr !='/') ) (name++) = (ptr++);
	1392
[204]	1393	// set NUL terminating character in name buffer
	1394	*(name++) = 0;
	1395
[1]	1396	// return last an next
	1397	if( *ptr == 0 ) // last found character is NUL => last name in path
	1398	{
	1399	*last = true;
	1400	}
	1401	else // last found character is '/' => skip it
	1402	{
	1403	*last = false;
	1404	*next = ptr + 1;
	1405	}
	1406
	1407	return 0;
[204]	1408
	1409	} // end vfs_get name_from_path()
[188]	1410
[23]	1411	//////////////////////////////////////////////
	1412	error_t vfs_lookup( xptr_t cwd_xp,
	1413	char * pathname,
	1414	uint32_t mode,
	1415	xptr_t * inode_xp )
[1]	1416	{
[101]	1417	char name[CONFIG_VFS_MAX_NAME_LENGTH]; // one name in path
[1]	1418
[23]	1419	xptr_t parent_xp; // extended pointer on parent inode
	1420	cxy_t parent_cxy; // cluster for parent inode
	1421	vfs_inode_t * parent_ptr; // local pointer on parent inode
	1422	xptr_t child_xp; // extended pointer on child inode
	1423	cxy_t child_cxy; // cluster for child inode
	1424	vfs_inode_t * child_ptr; // local pointer on child inode
	1425	vfs_fs_type_t fs_type; // File system type
	1426	vfs_ctx_t * ctx_ptr; // local pointer on FS context
	1427	char * current; // current pointer on path
	1428	char * next; // next value for current pointer
	1429	bool_t last; // true when the name is the last in path
	1430	bool_t found; // true when a child has been found
[459]	1431	bool_t dir; // searched inode is a directory
	1432	bool_t create; // searched inode must be created if not found
	1433	bool_t excl; // searched inode must not exist
[23]	1434	thread_t * this; // pointer on calling thread descriptor
	1435	process_t * process; // pointer on calling process descriptor
	1436	error_t error;
[1]	1437
	1438	this = CURRENT_THREAD;
	1439	process = this->process;
	1440
[438]	1441	#if DEBUG_VFS_LOOKUP
[433]	1442	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	1443	if( DEBUG_VFS_LOOKUP < cycle )
[459]	1444	printk("\n[DBG] %s : thread %x in process %x enter for <%s> / cycle %d\n",
	1445	__FUNCTION__, this->trdid, process->pid, pathname, cycle );
[433]	1446	#endif
[380]	1447
[459]	1448	// compute lookup flags
	1449	dir = mode & VFS_LOOKUP_DIR;
	1450	create = mode & VFS_LOOKUP_CREATE;
	1451	excl = mode & VFS_LOOKUP_EXCL;
	1452
[1]	1453	// get extended pointer on first inode to search
	1454	if( pathname[0] == '/' ) parent_xp = process->vfs_root_xp;
	1455	else parent_xp = cwd_xp;
	1456
[101]	1457	// initialise other loop variables
[1]	1458	current = pathname;
	1459	next = NULL;
	1460	last = false;
	1461	child_xp = XPTR_NULL;
	1462
	1463	// take lock on parent inode
[101]	1464	vfs_inode_lock( parent_xp );
[1]	1465
[401]	1466	// sequencially loop on nodes in pathname
[459]	1467	// load from device if one node in path not found in inode tree
[401]	1468	// exit loop when last name found (i.e. last == true)
[1]	1469	do
	1470	{
[401]	1471	// get one name from path, and "last" flag
[1]	1472	vfs_get_name_from_path( current , name , &next , &last );
	1473
[438]	1474	#if (DEBUG_VFS_LOOKUP & 1)
	1475	if( DEBUG_VFS_LOOKUP < cycle )
[459]	1476	printk("\n[DBG] %s : look for <%s> / last = %d\n",
	1477	__FUNCTION__ , name , last );
[433]	1478	#endif
[101]	1479
[204]	1480	// search a child dentry matching name in parent inode
[1]	1481	found = vfs_get_child( parent_xp,
	1482	name,
	1483	&child_xp );
	1484
[459]	1485	if (found == false ) // child not found in inode tree
[1]	1486	{
[101]	1487
[438]	1488	#if (DEBUG_VFS_LOOKUP & 1)
	1489	if( DEBUG_VFS_LOOKUP < cycle )
[459]	1490	printk("\n[DBG] %s : miss <%s> node => try to create it\n",
	1491	__FUNCTION__ , name );
[433]	1492	#endif
[459]	1493	// if a child node is not found in the inode tree,
	1494	// we introduce a new (dentry/inode) in inode tree,
	1495	// and try to find it by scanning the parent directory mapper.
	1496	// . if it is found in parent mapper:
	1497	// - if the child is a directory, the child mapper is loaded from device
	1498	// - if the child is not a directory, the search is completed
	1499	// . if it is not found in the parent mapper:
	1500	// - if ( not last or not create ) an error is reported
	1501	// - if (last and create and dir) a new directory is created
	1502	// - if (last and create and not dir) a new file is created
[407]	1503
[1]	1504	// release lock on parent inode
[101]	1505	vfs_inode_unlock( parent_xp );
[459]	1506
[238]	1507	// get parent inode FS type
[23]	1508	parent_cxy = GET_CXY( parent_xp );
[459]	1509	parent_ptr = GET_PTR( parent_xp );
	1510	ctx_ptr = (vfs_ctx_t *)hal_remote_lpt( XPTR( parent_cxy,&parent_ptr->ctx ) );
[238]	1511	fs_type = hal_remote_lw( XPTR( parent_cxy , &ctx_ptr->type ) );
[23]	1512
[238]	1513	// select a cluster for missing inode
	1514	child_cxy = vfs_cluster_random_select();
[401]	1515
[459]	1516	// insert a new child dentry/inode in inode tree
[188]	1517	error = vfs_add_child_in_parent( child_cxy,
[459]	1518	0, // type will be updated later
[23]	1519	fs_type,
	1520	parent_xp,
[222]	1521	name,
[459]	1522	NULL, // fs_type_specific inode extend
[23]	1523	&child_xp );
[1]	1524	if( error )
	1525	{
[459]	1526	printk("\n[ERROR] in %s : cannot create node %s for path <%s>\n",
	1527	__FUNCTION__ , name, pathname );
[238]	1528	return ENOMEM;
	1529	}
	1530
[459]	1531	// get child inode cluster and local pointer
	1532	child_cxy = GET_CXY( child_xp );
	1533	child_ptr = GET_PTR( child_xp );
	1534
	1535	#if (DEBUG_VFS_LOOKUP & 1)
	1536	if( DEBUG_VFS_LOOKUP < cycle )
	1537	printk("\n[DBG] %s : missing <%s> inode speculatively created / cxy %x / ptr %x\n",
	1538	__FUNCTION__ , name , child_cxy, child_ptr );
	1539	#endif
	1540	// scan parent mapper to complete the missing inode
[238]	1541	if( parent_cxy == local_cxy )
	1542	{
	1543	error = vfs_inode_load( parent_ptr,
	1544	name,
	1545	child_xp );
	1546	}
	1547	else
	1548	{
	1549	rpc_vfs_inode_load_client( parent_cxy,
	1550	parent_ptr,
	1551	name,
	1552	child_xp,
	1553	&error );
	1554	}
	1555
[459]	1556	if ( error ) // child not found in parent mapper
[238]	1557	{
[459]	1558	if( last && create && dir ) // new directory => update inode type
	1559	{
	1560	hal_remote_sw( XPTR( child_cxy, &child_ptr->type ), INODE_TYPE_DIR );
[1]	1561
[459]	1562	#if (DEBUG_VFS_LOOKUP & 1)
	1563	if( DEBUG_VFS_LOOKUP < cycle )
	1564	printk("\n[DBG] %s : created node <%s> in path %s / type DIR\n",
	1565	__FUNCTION__ , name, pathname );
	1566	#endif
[238]	1567	}
[459]	1568	else if ( last && create ) // new file => update inode type
[238]	1569	{
[459]	1570	hal_remote_sw( XPTR( child_cxy, &child_ptr->type ), INODE_TYPE_FILE );
[238]	1571
[459]	1572	#if (DEBUG_VFS_LOOKUP & 1)
	1573	if( DEBUG_VFS_LOOKUP < cycle )
	1574	printk("\n[DBG] %s : created node <%s> in path %s / type FILE\n",
	1575	__FUNCTION__ , name, pathname );
	1576	#endif
[238]	1577	}
[459]	1578	else // not last or not create => remove created node
	1579	{
	1580	printk("\n[ERROR] in %s : <%s> node not found in parent for <%s>\n",
	1581	__FUNCTION__ , name , pathname );
	1582	vfs_remove_child_from_parent( child_xp );
	1583	return ENOENT;
	1584	}
[238]	1585	}
[459]	1586	else // child found in parent
	1587	{
	1588	// load child mapper from device if child is a directory (prefetch)
	1589	if( hal_remote_lw( XPTR( child_cxy , &child_ptr->type ) ) == INODE_TYPE_DIR )
	1590	{
	1591	if( child_cxy == local_cxy )
	1592	{
	1593	error = vfs_mapper_load_all( child_ptr );
	1594	}
	1595	else
	1596	{
	1597	rpc_vfs_mapper_load_all_client( child_cxy,
	1598	child_ptr,
	1599	&error );
	1600	}
	1601	if ( error )
	1602	{
	1603	printk("\n[ERROR] in %s : cannot load <%s> from device\n",
	1604	__FUNCTION__ , name );
	1605	vfs_remove_child_from_parent( child_xp );
	1606	return EIO;
	1607	}
[238]	1608
[438]	1609	#if (DEBUG_VFS_LOOKUP & 1)
	1610	if( DEBUG_VFS_LOOKUP < cycle )
[459]	1611	printk("\n[DBG] %s : load mapper from device for node <%s> in path %s\n",
	1612	__FUNCTION__ , name, pathname );
[433]	1613	#endif
[459]	1614	}
	1615	}
[407]	1616
[459]	1617	// take lock on parent inode
	1618	vfs_inode_lock( parent_xp );
[1]	1619	}
[459]	1620	else // child found in inode tree
	1621	{
	1622
[438]	1623	#if (DEBUG_VFS_LOOKUP & 1)
	1624	if( DEBUG_VFS_LOOKUP < cycle )
[433]	1625	printk("\n[DBG] %s : found <%s> / inode %x in cluster %x\n",
	1626	__FUNCTION__ , name , GET_PTR(child_xp) , GET_CXY(child_xp) );
	1627	#endif
[459]	1628	child_ptr = GET_PTR( child_xp );
	1629	child_cxy = GET_CXY( child_xp );
	1630	parent_cxy = GET_CXY( parent_xp );
	1631	parent_ptr = GET_PTR( parent_xp );
[101]	1632
[459]	1633	if( last && (mode & VFS_LOOKUP_CREATE) && (mode & VFS_LOOKUP_EXCL) )
	1634	{
	1635	printk("\n[ERROR] in %s : node already exist <%s>\n", __FUNCTION__, name );
	1636	return EINVAL;
	1637	}
	1638	}
	1639
[380]	1640	// TODO check access rights here [AG]
[23]	1641	// error = vfs_access_denied( child_xp,
	1642	// client_uid,
	1643	// client_gid );
	1644	// if( error )
	1645	// {
[441]	1646	// printk("\n[ERROR] in %s : thread %x / permission denied for %s\n",
	1647	// __FUNCTION__ , this , name );
[23]	1648	// return EACCES;
	1649	// }
[1]	1650
[238]	1651	// take lock on child inode and release lock on parent
	1652	vfs_inode_lock( child_xp );
[101]	1653	vfs_inode_unlock( parent_xp );
[1]	1654
	1655	// update loop variables
	1656	parent_xp = child_xp;
	1657	current = next;
	1658	}
	1659	while( last == false );
	1660
[238]	1661	// release lock
	1662	vfs_inode_unlock( parent_xp );
[1]	1663
[438]	1664	#if DEBUG_VFS_LOOKUP
[433]	1665	cycle = (uint32_t)hal_get_cycles();
[438]	1666	if( DEBUG_VFS_LOOKUP < cycle )
[459]	1667	printk("\n[DBG] %s : thread %x in process %x exit for <%s>\n"
	1668	" parent %x in cluster %x / child %x in cluster %x / cycle %d\n",
	1669	__FUNCTION__ , this->trdid, process->pid, pathname,
	1670	parent_ptr, parent_cxy, child_ptr, child_cxy, cycle );
[433]	1671	#endif
[1]	1672
[238]	1673	// return searched pointer
[459]	1674	if( mode & VFS_LOOKUP_PARENT ) *inode_xp = parent_xp;
	1675	else *inode_xp = child_xp;
[1]	1676
	1677	return 0;
	1678
	1679	} // end vfs_lookup()
	1680
	1681	////////////////////////////////////////////
	1682	error_t vfs_get_path( xptr_t searched_xp,
	1683	char * buffer,
	1684	uint32_t max_size )
	1685	{
	1686	xptr_t dentry_xp; // extended pointer on current dentry
	1687	char * name; // local pointer on current dentry name
	1688	uint32_t length; // length of current dentry name
	1689	uint32_t count; // number of characters written in buffer
	1690	uint32_t index; // slot index in buffer
[23]	1691	xptr_t inode_xp; // extended pointer on
[1]	1692
	1693	// implementation note:
	1694	// we use two variables "index" and "count" because the buffer
[401]	1695	// is written in decreasing index order (from leaf to root)
[433]	1696	// TODO : handle conflict with a concurrent rename [AG]
	1697	// FIXME : handle synchro in the loop [AG]
[1]	1698
	1699	// set the NUL character in buffer / initialise buffer index and count
	1700	buffer[max_size - 1] = 0;
	1701	count = 1;
	1702	index = max_size - 2;
	1703
	1704	// initialize current inode
	1705	inode_xp = searched_xp;
	1706
	1707	// exit when root inode found (i.e. dentry_xp == XPTR_NULL)
	1708	do
	1709	{
	1710	// get inode cluster and local pointer
	1711	cxy_t inode_cxy = GET_CXY( inode_xp );
[473]	1712	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
[1]	1713
	1714	// get extended pointer on parent dentry
	1715	dentry_xp = (xptr_t)hal_remote_lwd( XPTR( inode_cxy , inode_ptr->parent_xp ) );
	1716
	1717	// get dentry cluster and local pointer
	1718	cxy_t dentry_cxy = GET_CXY( dentry_xp );
[473]	1719	vfs_dentry_t * dentry_ptr = GET_PTR( dentry_xp );
[1]	1720
	1721	// get dentry name length and pointer
	1722	length = hal_remote_lw( XPTR( dentry_cxy , &dentry_ptr->length ) );
	1723	name = (char *)hal_remote_lpt( XPTR( dentry_cxy , &dentry_ptr->name ) );
	1724
	1725	// update index and count
	1726	index -= (length + 1);
	1727	count += (length + 1);
	1728
	1729	// check buffer overflow
	1730	if( count >= max_size )
	1731	{
	1732	printk("\n[ERROR] in %s : kernel buffer too small\n", __FUNCTION__ );
	1733	return EINVAL;
	1734	}
	1735
	1736	// update pathname
	1737	hal_remote_memcpy( XPTR( local_cxy , &buffer[index + 1] ) ,
	1738	XPTR( dentry_cxy , name ) , length );
	1739	buffer[index] = '/';
	1740
	1741	// get extended pointer on next inode
	1742	inode_xp = (xptr_t)hal_remote_lwd( XPTR( dentry_cxy , dentry_ptr->parent ) );
	1743	}
	1744	while( (dentry_xp != XPTR_NULL) );
	1745
	1746	return 0;
	1747
	1748	} // end vfs_get_path()
	1749
[188]	1750
	1751	//////////////////////////////////////////////////////////////
	1752	error_t vfs_add_child_in_parent( cxy_t child_cxy,
	1753	vfs_inode_type_t inode_type,
[23]	1754	vfs_fs_type_t fs_type,
	1755	xptr_t parent_xp,
	1756	char * name,
[188]	1757	void * extend,
[23]	1758	xptr_t * child_xp )
[1]	1759	{
[23]	1760	error_t error;
	1761	xptr_t dentry_xp; // extended pointer on created dentry
	1762	xptr_t inode_xp; // extended pointer on created inode
	1763	cxy_t parent_cxy; // parent inode cluster identifier
	1764	vfs_inode_t * parent_ptr; // parent inode local pointer
[1]	1765
	1766	// get parent inode cluster and local pointer
[23]	1767	parent_cxy = GET_CXY( parent_xp );
[459]	1768	parent_ptr = GET_PTR( parent_xp );
[1]	1769
[438]	1770	#if DEBUG_VFS_ADD_CHILD
[433]	1771	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	1772	if( DEBUG_VFS_ADD_CHILD < cycle )
[459]	1773	printk("\n[DBG] %s : thread %x enter for <%s> / child_cxy = %x / parent_cxy = %x / cycle %d\n",
	1774	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, name,
	1775	child_cxy, parent_cxy, (uint32_t)hal_get_cycles() );
[433]	1776	#endif
[279]	1777
[204]	1778	// 1. create dentry
[1]	1779	if( parent_cxy == local_cxy ) // parent cluster is the local cluster
	1780	{
[23]	1781	error = vfs_dentry_create( fs_type,
[1]	1782	name,
	1783	parent_ptr,
	1784	&dentry_xp );
[279]	1785
[438]	1786	#if (DEBUG_VFS_ADD_CHILD & 1)
	1787	if( (DEBUG_VFS_ADD_CHILD < cycle) && (error == 0) )
[433]	1788	printk("\n[DBG] %s : dentry <%s> created in cluster %x\n", __FUNCTION__, name, local_cxy );
	1789	#endif
[407]	1790
[1]	1791	}
	1792	else // parent cluster is remote
	1793	{
	1794	rpc_vfs_dentry_create_client( parent_cxy,
[23]	1795	fs_type,
[1]	1796	name,
	1797	parent_ptr,
	1798	&dentry_xp,
	1799	&error );
[279]	1800
[438]	1801	#if (DEBUG_VFS_ADD_CHILD & 1)
	1802	if( (DEBUG_VFS_ADD_CHILD < cycle) && (error == 0) )
[433]	1803	printk("\n[DBG] %s : dentry <%s> created in cluster %x\n", __FUNCTION__, name, parent_cxy );
	1804	#endif
[407]	1805
[1]	1806	}
	1807
	1808	if( error )
	1809	{
[437]	1810	printk("\n[ERROR] in %s : cannot create dentry <%s> in cluster %x\n",
	1811	__FUNCTION__ , name , parent_cxy );
[204]	1812	return ENOMEM;
[1]	1813	}
	1814
[204]	1815	// 2. create child inode TODO : define attr / mode / uid / gid
[1]	1816	uint32_t attr = 0;
	1817	uint32_t mode = 0;
	1818	uint32_t uid = 0;
	1819	uint32_t gid = 0;
	1820
	1821	if( child_cxy == local_cxy ) // child cluster is the local cluster
	1822	{
	1823	error = vfs_inode_create( dentry_xp,
[23]	1824	fs_type,
	1825	inode_type,
[188]	1826	extend,
[1]	1827	attr,
	1828	mode,
	1829	uid,
	1830	gid,
	1831	&inode_xp );
[279]	1832
[438]	1833	#if (DEBUG_VFS_ADD_CHILD & 1)
	1834	if( DEBUG_VFS_ADD_CHILD < cycle )
[433]	1835	printk("\n[DBG] %s : inode <%x> created in cluster %x\n",
	1836	__FUNCTION__ , GET_PTR(inode_xp) , local_cxy );
	1837	#endif
	1838
[1]	1839	}
	1840	else // child cluster is remote
	1841	{
	1842	rpc_vfs_inode_create_client( child_cxy,
	1843	dentry_xp,
[23]	1844	fs_type,
	1845	inode_type,
[188]	1846	extend,
[1]	1847	attr,
	1848	mode,
	1849	uid,
	1850	gid,
	1851	&inode_xp,
	1852	&error );
[279]	1853
[438]	1854	#if (DEBUG_VFS_ADD_CHILD & 1)
	1855	if( DEBUG_VFS_ADD_CHILD < cycle )
[433]	1856	printk("\n[DBG] %s : inode <%s> created in cluster %x\n",
[407]	1857	__FUNCTION__ , GET_PTR(inode_xp) , child_cxy );
[433]	1858	#endif
[407]	1859
[1]	1860	}
	1861
	1862	if( error )
	1863	{
	1864	printk("\n[ERROR] in %s : cannot create inode in cluster %x\n",
	1865	__FUNCTION__ , child_cxy );
	1866
[459]	1867	vfs_dentry_t * dentry = GET_PTR( dentry_xp );
[1]	1868	if( parent_cxy == local_cxy ) vfs_dentry_destroy( dentry );
[459]	1869	else rpc_vfs_dentry_destroy_client( parent_cxy , dentry , &error );
[204]	1870	return ENOMEM;
[1]	1871	}
	1872
[204]	1873	// 3. update extended pointer on inode in dentry
	1874	cxy_t dentry_cxy = GET_CXY( dentry_xp );
[473]	1875	vfs_dentry_t * dentry_ptr = GET_PTR( dentry_xp );
[204]	1876	hal_remote_swd( XPTR( dentry_cxy , &dentry_ptr->child_xp ) , inode_xp );
	1877
[438]	1878	#if DEBUG_VFS_ADD_CHILD
[433]	1879	cycle = (uint32_t)hal_get_cycles();
[438]	1880	if( DEBUG_VFS_ADD_CHILD < cycle )
[459]	1881	printk("\n[DBG] %s : thread %x in process %x exit for <%s>\n",
	1882	__FUNCTION__, CURRENT_THREAD, CURRENT_THREAD->process->pid, name );
[433]	1883	#endif
[296]	1884
[1]	1885	// success : return extended pointer on child inode
	1886	*child_xp = inode_xp;
	1887	return 0;
	1888
[459]	1889	// FIXME update the refcount fields in both inode and dentry
	1890
[1]	1891	} // end vfs_add_child_in_parent()
	1892
[459]	1893	///////////////////////////////////////////////////////
	1894	error_t vfs_remove_child_from_parent( xptr_t inode_xp )
	1895	{
	1896	cxy_t inode_cxy;
	1897	vfs_inode_t * inode_ptr;
	1898	xptr_t dentry_xp;
	1899	cxy_t dentry_cxy;
	1900	vfs_dentry_t * dentry_ptr;
	1901	error_t error;
	1902
	1903	// get inode cluster and local pointer
	1904	inode_cxy = GET_CXY( inode_xp );
	1905	inode_ptr = GET_PTR( inode_xp );
	1906
	1907	// get cluster and pointers of associated dentry
	1908	dentry_xp = hal_remote_lwd( XPTR( inode_cxy , &inode_ptr->parent_xp ) );
	1909	dentry_cxy = GET_CXY( dentry_xp );
	1910	dentry_ptr = GET_PTR( dentry_xp );
	1911
	1912	// FIXME update the refcount fields in both inode and dentry
	1913
	1914	// delete dentry
	1915	if( dentry_cxy == local_cxy )
	1916	{
	1917	error = vfs_dentry_destroy( dentry_ptr );
	1918	}
	1919	else
	1920	{
	1921	rpc_vfs_dentry_destroy_client( dentry_cxy,
	1922	dentry_ptr,
	1923	&error );
	1924	}
	1925	if( error ) return EINVAL;
	1926
	1927	// delete inode
	1928	if( inode_cxy == local_cxy )
	1929	{
	1930	vfs_inode_destroy( inode_ptr );
	1931	}
	1932	else
	1933	{
	1934	rpc_vfs_inode_destroy_client( inode_cxy,
	1935	inode_ptr,
	1936	&error );
	1937	}
	1938	if( error ) return EINVAL;
	1939
	1940	return 0;
	1941
	1942	} // end vfs_remove_child_from_parent()
	1943
[23]	1944	//////////////////////////////////////////////////////////////////////////////////////////
	1945	// Mapper related functions
	1946	//////////////////////////////////////////////////////////////////////////////////////////
	1947
[238]	1948	////////////////////////////////////////////
	1949	error_t vfs_mapper_move_page( page_t * page,
	1950	bool_t to_mapper )
[23]	1951	{
[204]	1952	error_t error = 0;
[23]	1953
[492]	1954	assert( (page != NULL) , "page pointer is NULL\n" );
[23]	1955
[246]	1956	mapper_t * mapper = page->mapper;
[23]	1957
[492]	1958	assert( (mapper != NULL) , "no mapper for page\n" );
[23]	1959
[438]	1960	#if DEBUG_VFS_MAPPER_MOVE
[433]	1961	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	1962	if( DEBUG_VFS_MAPPER_MOVE < cycle )
[433]	1963	printk("\n[DBG] %s : thread %x enter for page %d / mapper %x / inode %x / cycle %d\n",
	1964	__FUNCTION__, CURRENT_THREAD, page->index, mapper, mapper->inode, cycle );
	1965	#endif
[246]	1966
[23]	1967	// get FS type
[246]	1968	vfs_fs_type_t fs_type = mapper->type;
[23]	1969
[238]	1970	// call relevant FS function
[23]	1971	if( fs_type == FS_TYPE_FATFS )
	1972	{
	1973	rwlock_wr_lock( &mapper->lock );
[246]	1974	error = fatfs_mapper_move_page( page , to_mapper );
[23]	1975	rwlock_wr_unlock( &mapper->lock );
	1976	}
	1977	else if( fs_type == FS_TYPE_RAMFS )
	1978	{
[492]	1979	assert( false , "should not be called for RAMFS\n" );
[23]	1980	}
	1981	else if( fs_type == FS_TYPE_DEVFS )
	1982	{
[492]	1983	assert( false , "should not be called for DEVFS\n" );
[23]	1984	}
	1985	else
	1986	{
[492]	1987	assert( false , "undefined file system type\n" );
[23]	1988	}
	1989
[438]	1990	#if DEBUG_VFS_MAPPER_MOVE
[433]	1991	cycle = (uint32_t)hal_get_cycles();
[438]	1992	if( DEBUG_VFS_MAPPER_MOVE < cycle )
[433]	1993	printk("\n[DBG] %s : thread %x exit for page %d / mapper %x / inode %x / cycle %d\n",
	1994	__FUNCTION__, CURRENT_THREAD, page->index, mapper, mapper->inode, cycle );
	1995	#endif
[246]	1996
[23]	1997	return error;
	1998
[238]	1999	} // end vfs_move_page()
[23]	2000
	2001	//////////////////////////////////////////////////
[238]	2002	error_t vfs_mapper_load_all( vfs_inode_t * inode )
[23]	2003	{
[492]	2004	assert( (inode != NULL) , "inode pointer is NULL\n" );
[23]	2005
[238]	2006	uint32_t index;
	2007	page_t * page;
[23]	2008
[238]	2009	mapper_t * mapper = inode->mapper;
	2010	uint32_t size = inode->size;
[23]	2011
[492]	2012	assert( (mapper != NULL) , "mapper pointer is NULL\n" );
[23]	2013
[438]	2014	#if DEBUG_VFS_MAPPER_LOAD
[433]	2015	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	2016	if( DEBUG_VFS_MAPPER_MOVE < cycle )
[433]	2017	printk("\n[DBG] %s : thread %x enter for inode %x in cluster %x / cycle %d\n",
	2018	__FUNCTION__, CURRENT_THREAD, inode, local_cxy, cycle );
	2019	#endif
[401]	2020
	2021	// compute number of pages
[238]	2022	uint32_t npages = size >> CONFIG_PPM_PAGE_SHIFT;
[265]	2023	if( (size & CONFIG_PPM_PAGE_MASK) \|\| (size == 0) ) npages++;
[238]	2024
[265]	2025	// loop on pages
[238]	2026	for( index = 0 ; index < npages ; index ++ )
[23]	2027	{
[238]	2028	// this function allocates the missing page in mapper,
	2029	// and call the vfs_mapper_move_page() to load the page from device
	2030	page = mapper_get_page( mapper , index );
[23]	2031
[238]	2032	if( page == NULL ) return EIO;
[23]	2033	}
	2034
[438]	2035	#if DEBUG_VFS_MAPPER_LOAD
[433]	2036	cycle = (uint32_t)hal_get_cycles();
[438]	2037	if( DEBUG_VFS_MAPPER_MOVE < cycle )
[433]	2038	printk("\n[DBG] %s : thread %x exit for inode %x in cluster %x / cycle %d\n",
	2039	__FUNCTION__, CURRENT_THREAD, inode, local_cxy, cycle );
	2040	#endif
[401]	2041
[238]	2042	return 0;
[23]	2043
[238]	2044	} // end vfs_mapper_load_all()
[23]	2045

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