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source: trunk/kernel/fs/vfs.c @ 606

Last change on this file since 606 was 602, checked in by alain, 6 years ago
Improve the FAT32 file system to support cat, rm, cp commands.
File size: 82.6 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 <printk.h>
	31	#include <list.h>
	32	#include <xlist.h>
	33	#include <slist.h>
	34	#include <xhtab.h>
[430]	35	#include <string.h>
[23]	36	#include <rpc.h>
[1]	37	#include <errno.h>
	38	#include <kmem.h>
	39	#include <mapper.h>
	40	#include <thread.h>
[337]	41	#include <chdev.h>
[1]	42	#include <process.h>
[568]	43	#include <cluster.h>
[23]	44	#include <vfs.h>
[1]	45	#include <fatfs.h>
	46	#include <ramfs.h>
[23]	47	#include <devfs.h>
	48	#include <syscalls.h>
[1]	49
	50
	51	//////////////////////////////////////////////////////////////////////////////////////////
[50]	52	// Extern variables
[1]	53	//////////////////////////////////////////////////////////////////////////////////////////
	54
[337]	55	extern vfs_ctx_t fs_context[FS_TYPES_NR]; // allocated in kernel_init.c
	56	extern chdev_directory_t chdev_dir; // allocated in kernel_init.c
[568]	57	extern char * lock_type_str[]; // allocated in kernel_init.c
[50]	58
[602]	59	///////////////////////////////////////////////////////////////////////////////////////////
	60	// VFS Context related functions
[1]	61	//////////////////////////////////////////////////////////////////////////////////////////
	62
[188]	63	////////////////////////////////////////
	64	void vfs_ctx_init( vfs_fs_type_t type,
	65	uint32_t attr,
	66	uint32_t total_clusters,
	67	uint32_t cluster_size,
	68	xptr_t vfs_root_xp,
	69	void * extend )
	70	{
	71	vfs_ctx_t * vfs_ctx = &fs_context[type];
	72
	73	vfs_ctx->type = type;
	74	vfs_ctx->attr = attr;
	75	vfs_ctx->total_clusters = total_clusters;
	76	vfs_ctx->cluster_size = cluster_size;
	77	vfs_ctx->vfs_root_xp = vfs_root_xp;
	78	vfs_ctx->extend = extend;
	79
[568]	80	busylock_init( &vfs_ctx->lock , LOCK_VFS_CTX );
[188]	81
	82	bitmap_init( vfs_ctx->bitmap , BITMAP_SIZE(CONFIG_VFS_MAX_INODES) );
	83	}
	84
[23]	85	////////////////////////////////////////////
[1]	86	error_t vfs_ctx_inum_alloc( vfs_ctx_t * ctx,
	87	uint32_t * inum )
	88	{
	89	// get lock on inum allocator
[568]	90	busylock_acquire( &ctx->lock );
[1]	91
	92	// get lid from local inum allocator
[23]	93	uint32_t lid = bitmap_ffc( ctx->bitmap , CONFIG_VFS_MAX_INODES );
[1]	94
[473]	95	if( lid == 0xFFFFFFFF ) // no more free slot => error
[1]	96	{
	97	// release lock
[568]	98	busylock_release( &ctx->lock );
[1]	99
	100	// return error
	101	return 1;
	102	}
	103	else // found => return inum
	104	{
	105	// set slot allocated
[23]	106	bitmap_set( ctx->bitmap , lid );
[1]	107
	108	// release lock
[568]	109	busylock_release( &ctx->lock );
[1]	110
	111	// return inum
	112	*inum = (((uint32_t)local_cxy) << 16) \| (lid & 0xFFFF);
	113	return 0;
	114	}
	115	}
	116
	117	////////////////////////////////////////////
	118	void vfs_ctx_inum_release( vfs_ctx_t * ctx,
	119	uint32_t inum )
	120	{
[23]	121	bitmap_clear( ctx->bitmap , inum & 0xFFFF );
[1]	122	}
	123
	124	//////////////////////////////////////////////////////////////////////////////////////////
[602]	125	// VFS inode descriptor related functions
[1]	126	//////////////////////////////////////////////////////////////////////////////////////////
	127
[598]	128	const char * vfs_inode_type_str( vfs_inode_type_t type )
[188]	129	{
[598]	130	switch ( type )
	131	{
	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";
[527]	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,
	147	uint32_t attr,
	148	uint32_t rights,
	149	uid_t uid,
	150	gid_t gid,
	151	xptr_t * inode_xp )
[1]	152	{
	153	mapper_t * mapper; // associated mapper( to be allocated)
	154	vfs_inode_t * inode; // inode descriptor (to be allocated)
	155	uint32_t inum; // inode identifier (to be allocated)
	156	vfs_ctx_t * ctx; // file system context
	157	kmem_req_t req; // request to kernel memory allocator
	158	error_t error;
	159
[438]	160	#if DEBUG_VFS_INODE_CREATE
[568]	161	char name[CONFIG_VFS_MAX_NAME_LENGTH];
	162	uint32_t cycle = (uint32_t)hal_get_cycles();
	163	cxy_t dentry_cxy = GET_CXY( dentry_xp );
	164	vfs_dentry_t * dentry_ptr = GET_PTR( dentry_xp );
	165	thread_t * this = CURRENT_THREAD;
	166	if( dentry_xp != XPTR_NULL ) hal_remote_strcpy( XPTR( local_cxy , name ),
	167	XPTR( dentry_cxy , dentry_ptr->name ) );
	168	else strcpy( name , "/" );
[438]	169	if( DEBUG_VFS_INODE_CREATE < cycle )
[598]	170	printk("\n[%s] thread[%x,%x] enter for <%s> / cycle %d\n",
	171	__FUNCTION__, this->process->pid, this->trdid, name, cycle );
[433]	172	#endif
[279]	173
[23]	174	// check fs type and get pointer on context
	175	if ( fs_type == FS_TYPE_FATFS ) ctx = &fs_context[FS_TYPE_FATFS];
	176	else if( fs_type == FS_TYPE_RAMFS ) ctx = &fs_context[FS_TYPE_RAMFS];
	177	else if( fs_type == FS_TYPE_DEVFS ) ctx = &fs_context[FS_TYPE_DEVFS];
[1]	178	else
	179	{
	180	ctx = NULL;
[492]	181	assert( false , "illegal file system type = %d\n" , fs_type );
[1]	182	}
	183
	184	// allocate inum
	185	error = vfs_ctx_inum_alloc( ctx , &inum );
	186
	187	if( error )
	188	{
	189	printk("\n[ERROR] in %s : cannot allocate inum\n", __FUNCTION__ );
	190	return ENOMEM;
	191	}
	192
	193	// allocate memory for mapper
[246]	194	mapper = mapper_create( fs_type );
[1]	195
	196	if( mapper == NULL )
	197	{
	198	printk("\n[ERROR] in %s : cannot allocate mapper\n", __FUNCTION__ );
	199	vfs_ctx_inum_release( ctx , inum );
	200	return ENOMEM;
	201	}
	202
[23]	203	// allocate memory for VFS inode descriptor
[1]	204	req.type = KMEM_VFS_INODE;
	205	req.size = sizeof(vfs_inode_t);
	206	req.flags = AF_KERNEL \| AF_ZERO;
	207	inode = (vfs_inode_t *)kmem_alloc( &req );
	208
	209	if( inode == NULL )
	210	{
	211	printk("\n[ERROR] in %s : cannot allocate inode descriptor\n", __FUNCTION__ );
	212	vfs_ctx_inum_release( ctx , inum );
	213	mapper_destroy( mapper );
	214	return ENOMEM;
	215	}
	216
	217	// initialize inode descriptor
	218	inode->gc = 0;
[23]	219	inode->type = inode_type;
[1]	220	inode->inum = inum;
	221	inode->attr = attr;
[23]	222	inode->rights = rights;
[1]	223	inode->uid = uid;
	224	inode->gid = gid;
	225	inode->refcount = 0;
	226	inode->parent_xp = dentry_xp;
	227	inode->ctx = ctx;
[246]	228	inode->mapper = mapper;
[602]	229	inode->extend = NULL;
[1]	230
[246]	231	// initialise inode field in mapper
	232	mapper->inode = inode;
	233
[1]	234	// initialise threads waiting queue
	235	xlist_root_init( XPTR( local_cxy , &inode->wait_root ) );
	236
[204]	237	// initialize dentries hash table
	238	xhtab_init( &inode->children , XHTAB_DENTRY_TYPE );
[1]	239
[568]	240	// initialize inode lock
	241	remote_rwlock_init( XPTR( local_cxy , &inode->data_lock ), LOCK_VFS_INODE );
[1]	242
[568]	243	// initialise lock protecting inode three traversal
	244	remote_busylock_init( XPTR( local_cxy , &inode->main_lock ), LOCK_VFS_MAIN );
	245
[438]	246	#if DEBUG_VFS_INODE_CREATE
[568]	247	cycle = (uint32_t)hal_get_cycles();
[438]	248	if( DEBUG_VFS_INODE_CREATE < cycle )
[598]	249	printk("\n[%s] thread[%x,%x] exit for <%s> / inode [%x,%x] / cycle %d\n",
	250	__FUNCTION__, this->process->pid, this->trdid, name, local_cxy, inode, cycle );
[433]	251	#endif
[401]	252
[1]	253	// return extended pointer on inode
	254	*inode_xp = XPTR( local_cxy , inode );
	255	return 0;
	256
	257	} // end vfs_inode_create()
	258
[602]	259	/////////////////////////////////////////////
	260	void vfs_inode_destroy( vfs_inode_t * inode )
[1]	261	{
	262
[602]	263	// check inode refcount
	264	assert( (inode->refcount == 0) , "inode refcount non zero\n" );
	265
[1]	266	// release memory allocated for mapper
	267	mapper_destroy( inode->mapper );
	268
	269	// release memory allocate for inode descriptor
	270	kmem_req_t req;
	271	req.ptr = inode;
	272	req.type = KMEM_VFS_INODE;
	273	kmem_free( &req );
	274
	275	} // end vfs_inode_destroy()
	276
	277	////////////////////////////////////////////
	278	void vfs_inode_remote_up( xptr_t inode_xp )
	279	{
	280	// get inode cluster and local pointer
	281	cxy_t inode_cxy = GET_CXY( inode_xp );
[473]	282	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
[1]	283
	284	hal_remote_atomic_add( XPTR( inode_cxy , &inode_ptr->refcount ) , 1 );
	285	}
	286
	287	//////////////////////////////////////////////
	288	void vfs_inode_remote_down( xptr_t inode_xp )
	289	{
	290	// get inode cluster and local pointer
	291	cxy_t inode_cxy = GET_CXY( inode_xp );
[473]	292	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
[1]	293
	294	hal_remote_atomic_add( XPTR( inode_cxy , &inode_ptr->refcount ) , -1 );
	295	}
	296
	297	//////////////////////////////////////////////
	298	uint32_t vfs_inode_get_size( xptr_t inode_xp )
	299	{
	300	// get inode cluster and local pointer
	301	cxy_t cxy = GET_CXY( inode_xp );
[473]	302	vfs_inode_t * ptr = GET_PTR( inode_xp );
[1]	303
	304	// get size
[568]	305	remote_rwlock_rd_acquire( XPTR( cxy , &ptr->data_lock ) );
	306	uint32_t size = hal_remote_l32( XPTR( cxy , &ptr->size ) );
	307	remote_rwlock_rd_release( XPTR( cxy , &ptr->data_lock ) );
[1]	308	return size;
	309	}
	310
[101]	311	////////////////////////////////////////////
	312	void vfs_inode_set_size( xptr_t inode_xp,
[409]	313	uint32_t size )
[1]	314	{
	315	// get inode cluster and local pointer
	316	cxy_t cxy = GET_CXY( inode_xp );
[473]	317	vfs_inode_t * ptr = GET_PTR( inode_xp );
[1]	318
	319	// set size
[568]	320	remote_rwlock_wr_release( XPTR( cxy , &ptr->data_lock ) );
	321	hal_remote_s32( XPTR( cxy , &ptr->size ) , size );
	322	remote_rwlock_wr_release( XPTR( cxy , &ptr->data_lock ) );
[1]	323	}
	324
[101]	325	////////////////////////////////////////
	326	void vfs_inode_unlock( xptr_t inode_xp )
[1]	327	{
	328	// get inode cluster and local pointer
	329	cxy_t cxy = GET_CXY( inode_xp );
[473]	330	vfs_inode_t * ptr = GET_PTR( inode_xp );
[1]	331
	332	// release the main lock
[568]	333	remote_busylock_release( XPTR( cxy , &ptr->main_lock ) );
[1]	334	}
	335
[101]	336	//////////////////////////////////////
	337	void vfs_inode_lock( xptr_t inode_xp )
[1]	338	{
	339	// get inode cluster and local pointer
	340	cxy_t cxy = GET_CXY( inode_xp );
[473]	341	vfs_inode_t * ptr = GET_PTR( inode_xp );
[1]	342
	343	// get the main lock
[568]	344	remote_busylock_acquire( XPTR( cxy , &ptr->main_lock ) );
[1]	345	}
	346
[101]	347	/////////////////////////////////////////
[409]	348	void vfs_inode_get_name( xptr_t inode_xp,
	349	char * name )
[101]	350	{
[204]	351	cxy_t inode_cxy;
	352	vfs_inode_t * inode_ptr;
	353	xptr_t dentry_xp;
	354	cxy_t dentry_cxy;
	355	vfs_dentry_t * dentry_ptr;
	356
	357	// get inode cluster and local pointer
	358	inode_cxy = GET_CXY( inode_xp );
[473]	359	inode_ptr = GET_PTR( inode_xp );
[204]	360
	361	// get parent dentry
[568]	362	dentry_xp = hal_remote_l64( XPTR( inode_cxy , &inode_ptr->parent_xp ) );
[204]	363
	364	// get local copy of name
	365	if( dentry_xp == XPTR_NULL ) // it is the VFS root
	366	{
	367	strcpy( name , "/" );
	368	}
	369	else // not the VFS root
	370	{
	371	dentry_cxy = GET_CXY( dentry_xp );
[473]	372	dentry_ptr = GET_PTR( dentry_xp );
[204]	373
	374	hal_remote_strcpy( XPTR( local_cxy , name ) ,
	375	XPTR( dentry_cxy , &dentry_ptr->name ) );
	376	}
[409]	377	} // end vfs_inode_get_name()
[204]	378
[602]	379	///////////////////////////////////////////////////////
	380	error_t vfs_inode_load_all_pages( vfs_inode_t * inode )
	381	{
	382
	383	assert( (inode != NULL) , "inode pointer is NULL\n" );
	384
	385	uint32_t page_id;
	386	xptr_t page_xp;
	387
	388	mapper_t * mapper = inode->mapper;
	389	uint32_t size = inode->size;
	390
	391	assert( (mapper != NULL) , "mapper pointer is NULL\n" );
	392
	393	#if DEBUG_VFS_INODE_LOAD_ALL
	394	uint32_t cycle = (uint32_t)hal_get_cycles();
	395	thread_t * this = CURRENT_THREAD;
	396	char name[CONFIG_VFS_MAX_NAME_LENGTH];
	397	vfs_inode_get_name( XPTR( local_cxy , inode ) , name );
	398	if( DEBUG_VFS_INODE_LOAD_ALL < cycle )
	399	printk("\n[%s] thread[%x,%x] enter for <%s> in cluster %x / cycle %d\n",
	400	__FUNCTION__, this->process->pid, this->trdid, name, local_cxy, cycle );
	401	#endif
	402
	403	// compute number of pages
	404	uint32_t npages = size >> CONFIG_PPM_PAGE_SHIFT;
	405	if( (size & CONFIG_PPM_PAGE_MASK) \|\| (size == 0) ) npages++;
	406
	407	// loop on pages
	408	for( page_id = 0 ; page_id < npages ; page_id ++ )
	409	{
	410	// If the mage is missing, this function allocates the missing page,
	411	// and load the page from IOC device into mapper
	412	page_xp = mapper_remote_get_page( XPTR( local_cxy , mapper ), page_id );
	413
	414	if( page_xp == XPTR_NULL ) return -1;
	415	}
	416
	417	#if DEBUG_VFS_INODE_LOAD_ALL
	418	cycle = (uint32_t)hal_get_cycles();
	419	if( DEBUG_VFS_INODE_LOAD_ALL < cycle )
	420	printk("\n[%s] thread[%x,%x] exit for <%x> in cluster %x / cycle %d\n",
	421	__FUNCTION__, this->process->pid, this->trdid, name, local_cxy, cycle );
	422	#endif
	423
	424	return 0;
	425
	426	} // end vfs_inode_load_all_pages()
	427
[204]	428	////////////////////////////////////////////////////////////////////////////////////////////
[602]	429	// VFS dentry descriptor related functions
[1]	430	//////////////////////////////////////////////////////////////////////////////////////////
	431
[23]	432	///////////////////////////////////////////////////
	433	error_t vfs_dentry_create( vfs_fs_type_t fs_type,
	434	char * name,
	435	vfs_inode_t * parent,
	436	xptr_t * dentry_xp )
[1]	437	{
	438	vfs_ctx_t * ctx; // context descriptor
	439	vfs_dentry_t * dentry; // dentry descriptor (to be allocated)
	440	kmem_req_t req; // request to kernel memory allocator
[459]	441	error_t error;
[1]	442
[438]	443	#if DEBUG_VFS_DENTRY_CREATE
[598]	444	thread_t * this = CURRENT_THREAD;
[433]	445	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	446	if( DEBUG_VFS_DENTRY_CREATE < cycle )
[598]	447	printk("\n[%s] thread[%x,%x] enter for <%s> / parent_inode %x / cycle %d\n",
	448	__FUNCTION__, this->process->pid, this->trdid, name, parent, cycle );
[433]	449	#endif
[296]	450
[188]	451	// get pointer on context
[23]	452	if ( fs_type == FS_TYPE_FATFS ) ctx = &fs_context[FS_TYPE_FATFS];
	453	else if( fs_type == FS_TYPE_RAMFS ) ctx = &fs_context[FS_TYPE_RAMFS];
	454	else if( fs_type == FS_TYPE_DEVFS ) ctx = &fs_context[FS_TYPE_DEVFS];
[459]	455	else
[1]	456	{
	457	ctx = NULL;
[459]	458	return EINVAL;
[1]	459	}
	460
	461	// get name length
	462	uint32_t length = strlen( name );
	463
[459]	464	if( length >= CONFIG_VFS_MAX_NAME_LENGTH ) return EINVAL;
[437]	465
[1]	466	// allocate memory for dentry descriptor
	467	req.type = KMEM_VFS_DENTRY;
	468	req.size = sizeof(vfs_dentry_t);
	469	req.flags = AF_KERNEL \| AF_ZERO;
	470	dentry = (vfs_dentry_t *)kmem_alloc( &req );
	471
[459]	472	if( dentry == NULL ) return ENOMEM;
[437]	473
[1]	474	// initialize dentry descriptor
[23]	475
[1]	476	dentry->ctx = ctx;
	477	dentry->length = length;
	478	dentry->parent = parent;
[602]	479	dentry->extend = NULL;
[1]	480	strcpy( dentry->name , name );
	481
[438]	482	#if( DEBUG_VFS_DENTRY_CREATE & 1 )
[437]	483	cycle = (uint32_t)hal_get_cycles();
[438]	484	if( DEBUG_VFS_DENTRY_CREATE < cycle )
[598]	485	printk("\n[%s] thread[%x,%x] / dentry <%s> initialised / cycle %d\n",
	486	__FUNCTION__, this->process->pid, this->trdid, dentry->name, cycle );
[437]	487	#endif
	488
[23]	489	// register dentry in hash table rooted in parent inode
[459]	490	error = xhtab_insert( XPTR( local_cxy , &parent->children ),
	491	name,
	492	XPTR( local_cxy , &dentry->list ) );
[23]	493
[459]	494	if( error ) return EINVAL;
	495
[438]	496	#if( DEBUG_VFS_DENTRY_CREATE & 1 )
[437]	497	cycle = (uint32_t)hal_get_cycles();
[438]	498	if( DEBUG_VFS_DENTRY_CREATE < cycle )
[598]	499	printk("\n[%s] thread[%x,%x] / dentry <%s> registered / cycle %d\n",
	500	__FUNCTION__, this->process->pid, this->trdid, dentry->name, cycle );
[437]	501	#endif
	502
[23]	503	// return extended pointer on dentry
[1]	504	*dentry_xp = XPTR( local_cxy , dentry );
	505
[438]	506	#if DEBUG_VFS_DENTRY_CREATE
[433]	507	cycle = (uint32_t)hal_get_cycles();
[438]	508	if( DEBUG_VFS_DENTRY_CREATE < cycle )
[602]	509	printk("\n[%s] thread[%x,%x] exit for <%s> / dentry [%x,%x] / cycle %d\n",
	510	__FUNCTION__, this->process->pid, this->trdid, name, local_cxy, dentry, cycle );
[433]	511	#endif
[296]	512
[1]	513	return 0;
	514
	515	} // end vfs_dentry_create()
	516
[602]	517	////////////////////////////////////////////////
	518	void vfs_dentry_destroy( vfs_dentry_t * dentry )
[1]	519	{
	520
[602]	521	// check dentry refcount
	522	assert( (dentry->refcount == 0) , "dentry refcount non zero\n" );
[459]	523
	524	// get pointer on parent inode
	525	vfs_inode_t * parent = dentry->parent;
	526
	527	// remove this dentry from parent inode htab
[602]	528	xhtab_remove( XPTR( local_cxy , &parent->children ),
	529	dentry->name,
	530	XPTR( local_cxy , &dentry->list ) );
[459]	531
	532	// release memory allocated to dentry
[1]	533	kmem_req_t req;
	534	req.ptr = dentry;
	535	req.type = KMEM_VFS_DENTRY;
	536	kmem_free( &req );
[459]	537
[602]	538	} // end vfs_dentry_destroy()
	539
	540	//////////////////////////////////////////////
	541	void vfs_dentry_remote_up( xptr_t dentry_xp )
	542	{
	543	// get dentry cluster and local pointer
	544	cxy_t dentry_cxy = GET_CXY( dentry_xp );
	545	vfs_dentry_t * dentry_ptr = GET_PTR( dentry_xp );
	546
	547	hal_remote_atomic_add( XPTR( dentry_cxy , &dentry_ptr->refcount ) , 1 );
[1]	548	}
	549
[602]	550	////////////////////////////////////////////////
	551	void vfs_dentry_remote_down( xptr_t dentry_xp )
	552	{
	553	// get dentry cluster and local pointer
	554	cxy_t dentry_cxy = GET_CXY( dentry_xp );
	555	vfs_dentry_t * dentry_ptr = GET_PTR( dentry_xp );
[1]	556
[602]	557	hal_remote_atomic_add( XPTR( dentry_cxy , &dentry_ptr->refcount ) , -1 );
	558	}
[188]	559
[602]	560
	561
[1]	562	//////////////////////////////////////////////////////////////////////////////////////////
[602]	563	// VFS file descriptor related functions
[1]	564	//////////////////////////////////////////////////////////////////////////////////////////
	565
[23]	566	/////////////////////////////////////////////
	567	error_t vfs_file_create( vfs_inode_t * inode,
	568	uint32_t attr,
	569	xptr_t * file_xp )
	570	{
	571	vfs_file_t * file;
	572	kmem_req_t req;
	573
[568]	574	#if DEBUG_VFS_FILE_CREATE
[598]	575	thread_t * this = CURRENT_THREAD;
[568]	576	uint32_t cycle = (uint32_t)hal_get_cycles();
	577	if( DEBUG_VFS_OPEN < cycle )
[598]	578	printk("\n[%s] thread[%x,%x] enter for inode %x in cluster %x / cycle %d\n",
	579	__FUNCTION__, this->process->pid, this->trdid, inode, local_cxy, cycle );
[568]	580	#endif
	581
[23]	582	// allocate memory for new file descriptor
	583	req.type = KMEM_VFS_FILE;
	584	req.size = sizeof(vfs_file_t);
	585	req.flags = AF_KERNEL \| AF_ZERO;
	586	file = (vfs_file_t *)kmem_alloc( &req );
	587
	588	if( file == NULL ) return ENOMEM;
	589
	590	// initializes new file descriptor
	591	file->gc = 0;
	592	file->type = inode->type;
	593	file->attr = attr;
	594	file->offset = 0;
[337]	595	file->refcount = 1;
[23]	596	file->inode = inode;
	597	file->ctx = inode->ctx;
	598	file->mapper = inode->mapper;
	599
[568]	600	remote_rwlock_init( XPTR( local_cxy , &file->lock ), LOCK_VFS_FILE );
[23]	601
	602	*file_xp = XPTR( local_cxy , file );
[459]	603
[568]	604	#if DEBUG_VFS_FILE_CREATE
	605	cycle = (uint32_t)hal_get_cycles();
[459]	606	if( DEBUG_VFS_OPEN < cycle )
[598]	607	printk("\n[%s] thread[%x,%x] created file %x in cluster %x / cycle %d\n",
	608	__FUNCTION__, this->process->pid, this->trdid, file, local_cxy, cycle );
[459]	609	#endif
	610
[23]	611	return 0;
	612
	613	} // end vfs_file_create()
	614
	615	///////////////////////////////////////////
	616	void vfs_file_destroy( vfs_file_t * file )
	617	{
	618	if( file->refcount )
	619	{
[492]	620	assert( false , "refcount non zero\n" );
[23]	621	}
	622
	623	kmem_req_t req;
	624	req.ptr = file;
	625	req.type = KMEM_VFS_FILE;
	626	kmem_free( &req );
	627
[459]	628	#if DEBUG_VFS_CLOSE
[598]	629	thread_t * this = CURRENT_THREAD;
[459]	630	uint32_t cycle = (uint32_t)hal_get_cycles();
	631	if( DEBUG_VFS_CLOSE < cycle )
[598]	632	printk("\n[%s] thread[%x,%x] deleted file %x in cluster %x / cycle %d\n",
	633	__FUNCTION__, this->process->pid, this->trdid, file, local_cxy, cycle );
[459]	634	#endif
	635
[23]	636	} // end vfs_file_destroy()
	637
	638
[1]	639	////////////////////////////////////////
	640	void vfs_file_count_up( xptr_t file_xp )
	641	{
	642	// get file cluster and local pointer
	643	cxy_t file_cxy = GET_CXY( file_xp );
[459]	644	vfs_file_t * file_ptr = GET_PTR( file_xp );
[1]	645
	646	// atomically increment count
	647	hal_remote_atomic_add( XPTR( file_cxy , &file_ptr->refcount ) , 1 );
	648	}
	649
	650	//////////////////////////////////////////
	651	void vfs_file_count_down( xptr_t file_xp )
	652	{
	653	// get file cluster and local pointer
	654	cxy_t file_cxy = GET_CXY( file_xp );
[459]	655	vfs_file_t * file_ptr = GET_PTR( file_xp );
[1]	656
	657	// atomically decrement count
	658	hal_remote_atomic_add( XPTR( file_cxy , &file_ptr->refcount ) , -1 );
	659	}
	660
[23]	661	//////////////////////////////////////////////////////////////////////////////////////////
[602]	662	// "syscalls" API related functions
[23]	663	//////////////////////////////////////////////////////////////////////////////////////////
	664
[407]	665	//////////////////////////////////////
	666	error_t vfs_open( process_t * process,
	667	char * path,
	668	uint32_t flags,
	669	uint32_t mode,
	670	xptr_t * new_file_xp,
	671	uint32_t * new_file_id )
[1]	672	{
[23]	673	error_t error;
	674	xptr_t inode_xp; // extended pointer on target inode
	675	cxy_t inode_cxy; // inode cluster identifier
	676	vfs_inode_t * inode_ptr; // inode local pointer
	677	uint32_t file_attr; // file descriptor attributes
	678	uint32_t lookup_mode; // lookup working mode
	679	xptr_t file_xp; // extended pointer on created file descriptor
	680	uint32_t file_id; // created file descriptor index in reference fd_array
[1]	681
[473]	682
[602]	683	if( mode != 0 )
	684	{
	685	printk("\n[ERROR] in %s : the mode parameter is not supported yet\n" );
	686	return -1;
	687	}
	688
[438]	689	#if DEBUG_VFS_OPEN
[598]	690	thread_t * this = CURRENT_THREAD;
[433]	691	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	692	if( DEBUG_VFS_OPEN < cycle )
[598]	693	printk("\n[%s] thread[%x,%x] enter for <%s> / cycle %d\n",
	694	__FUNCTION__, this->process->pid, this->trdid, path, cycle );
[433]	695	#endif
[101]	696
[23]	697	// compute lookup working mode
	698	lookup_mode = VFS_LOOKUP_OPEN;
	699	if( (flags & O_DIR ) ) lookup_mode \|= VFS_LOOKUP_DIR;
	700	if( (flags & O_CREAT ) ) lookup_mode \|= VFS_LOOKUP_CREATE;
	701	if( (flags & O_EXCL ) ) lookup_mode \|= VFS_LOOKUP_EXCL;
	702
	703	// compute attributes for the created file
	704	file_attr = 0;
[407]	705	if( (flags & O_RDONLY ) == 0 ) file_attr \|= FD_ATTR_WRITE_ENABLE;
	706	if( (flags & O_WRONLY ) == 0 ) file_attr \|= FD_ATTR_READ_ENABLE;
[23]	707	if( (flags & O_SYNC ) ) file_attr \|= FD_ATTR_SYNC;
	708	if( (flags & O_APPEND ) ) file_attr \|= FD_ATTR_APPEND;
	709	if( (flags & O_CLOEXEC) ) file_attr \|= FD_ATTR_CLOSE_EXEC;
[1]	710
[23]	711	// get extended pointer on target inode
[407]	712	error = vfs_lookup( process->vfs_cwd_xp , path , lookup_mode , &inode_xp );
[23]	713
	714	if( error ) return error;
	715
	716	// get target inode cluster and local pointer
	717	inode_cxy = GET_CXY( inode_xp );
[473]	718	inode_ptr = GET_PTR( inode_xp );
[23]	719
	720	// create a new file descriptor in cluster containing inode
	721	if( inode_cxy == local_cxy ) // target cluster is local
[1]	722	{
[23]	723	error = vfs_file_create( inode_ptr , file_attr , &file_xp );
[1]	724	}
[23]	725	else // target cluster is remote
	726	{
	727	rpc_vfs_file_create_client( inode_cxy , inode_ptr , file_attr , &file_xp , &error );
	728	}
[1]	729
[23]	730	if( error ) return error;
[1]	731
[407]	732	// allocate and register a new file descriptor index in reference process
	733	error = process_fd_register( process , file_xp , &file_id );
[1]	734
[23]	735	if( error ) return error;
[1]	736
[438]	737	#if DEBUG_VFS_OPEN
[433]	738	cycle = (uint32_t)hal_get_cycles();
[438]	739	if( DEBUG_VFS_OPEN < cycle )
[598]	740	printk("\n[%s] thread[%x,%x] exit for <%s> / fdid %d / cluster %x / cycle %d\n",
	741	__FUNCTION__, this->process->pid, this->trdid, path, file_id, GET_CXY( file_xp ), cycle );
[433]	742	#endif
[238]	743
[23]	744	// success
	745	*new_file_xp = file_xp;
	746	*new_file_id = file_id;
	747	return 0;
[1]	748
[23]	749	} // end vfs_open()
	750
[407]	751	//////////////////////////////////////
	752	int vfs_user_move( bool_t to_buffer,
	753	xptr_t file_xp,
	754	void * buffer,
	755	uint32_t size )
[23]	756	{
	757	cxy_t file_cxy; // remote file descriptor cluster
	758	vfs_file_t * file_ptr; // remote file descriptor local pointer
	759	vfs_inode_type_t inode_type;
	760	uint32_t file_offset; // current offset in file
	761	mapper_t * mapper;
	762	error_t error;
	763
[602]	764	// check argument
	765	assert( (file_xp != XPTR_NULL), "file_xp == XPTR_NULL\n" );
	766
[23]	767	// get cluster and local pointer on remote file descriptor
	768	file_cxy = GET_CXY( file_xp );
[473]	769	file_ptr = GET_PTR( file_xp );
[23]	770
	771	// get inode type from remote file descriptor
[568]	772	inode_type = hal_remote_l32( XPTR( file_cxy , &file_ptr->type ) );
[23]	773
[602]	774	// check inode type
	775	assert( (inode_type == INODE_TYPE_FILE), "inode type is not INODE_TYPE_FILE" );
[23]	776
[407]	777	// get mapper pointer and file offset from file descriptor
[568]	778	file_offset = hal_remote_l32( XPTR( file_cxy , &file_ptr->offset ) );
[407]	779	mapper = (mapper_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->mapper ) );
[23]	780
[407]	781	// move data between mapper and buffer
	782	if( file_cxy == local_cxy )
	783	{
	784	error = mapper_move_user( mapper,
	785	to_buffer,
	786	file_offset,
	787	buffer,
	788	size );
[23]	789	}
[407]	790	else
[23]	791	{
[602]	792	rpc_mapper_move_user_client( file_cxy,
	793	mapper,
	794	to_buffer,
	795	file_offset,
	796	buffer,
	797	size,
	798	&error );
[407]	799	}
	800
[602]	801	// update file offset in file descriptor
	802	hal_remote_atomic_add( XPTR( file_cxy , &file_ptr->offset ) , size );
[407]	803
[602]	804	if( error )
	805	{
	806	return -1;
	807	}
	808
	809	return size;
	810
[313]	811	} // end vfs_user_move()
[23]	812
[317]	813	////////////////////////////////////////////
	814	error_t vfs_kernel_move( bool_t to_buffer,
	815	xptr_t file_xp,
	816	xptr_t buffer_xp,
	817	uint32_t size )
	818	{
	819	cxy_t file_cxy; // remote file descriptor cluster
	820	vfs_file_t * file_ptr; // remote file descriptor local pointer
[602]	821	vfs_inode_type_t inode_type; // remote file type
[317]	822	uint32_t file_offset; // current offset in file
[602]	823	mapper_t * mapper_ptr; // remote mapper local pointer
	824	xptr_t mapper_xp; // remote mapper extended pointer
[317]	825	error_t error;
	826
[602]	827	// check argument
	828	assert( (file_xp != XPTR_NULL) , "file_xp == XPTR_NULL\n" );
	829
[317]	830	// get cluster and local pointer on remote file descriptor
	831	file_cxy = GET_CXY( file_xp );
[473]	832	file_ptr = GET_PTR( file_xp );
[317]	833
	834	// get inode type from remote file descriptor
[568]	835	inode_type = hal_remote_l32( XPTR( file_cxy , &file_ptr->type ) );
[317]	836
	837	// action depends on inode type
	838	if( inode_type == INODE_TYPE_FILE )
	839	{
[602]	840	// get mapper pointers and file offset from file descriptor
[568]	841	file_offset = hal_remote_l32( XPTR( file_cxy , &file_ptr->offset ) );
[602]	842	mapper_ptr = hal_remote_lpt( XPTR( file_cxy , &file_ptr->mapper ) );
	843	mapper_xp = XPTR( file_cxy , mapper_ptr );
[317]	844
	845	// move data between mapper and buffer
[602]	846	error = mapper_move_kernel( mapper_xp,
	847	to_buffer,
	848	file_offset,
	849	buffer_xp,
	850	size );
[317]	851	if( error ) return -1;
	852	}
	853	else
	854	{
	855	printk("\n[ERROR] in %s : inode is not a file", __FUNCTION__ );
	856	return -1;
	857	}
[602]	858
	859	return 0;
	860
[317]	861	} // end vfs_kernel_move()
	862
[23]	863	//////////////////////////////////////
	864	error_t vfs_lseek( xptr_t file_xp,
	865	uint32_t offset,
	866	uint32_t whence,
	867	uint32_t * new_offset )
	868	{
[266]	869	xptr_t offset_xp;
	870	xptr_t lock_xp;
[602]	871	xptr_t size_xp;
[266]	872	cxy_t file_cxy;
	873	vfs_file_t * file_ptr;
	874	vfs_inode_t * inode_ptr;
	875	uint32_t new;
	876
[602]	877	// check argument
	878	assert( (file_xp != XPTR_NULL) , "file_xp == XPTR_NULL\n" );
[266]	879
	880	// get cluster and local pointer on remote file descriptor
	881	file_cxy = GET_CXY( file_xp );
[473]	882	file_ptr = GET_PTR( file_xp );
[266]	883
[602]	884	// get local pointer on remote inode
	885	inode_ptr = (vfs_inode_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
	886
	887	// build extended pointers on lock, offset and size
[266]	888	offset_xp = XPTR( file_cxy , &file_ptr->offset );
	889	lock_xp = XPTR( file_cxy , &file_ptr->lock );
[602]	890	size_xp = XPTR( file_cxy , &inode_ptr->size );
[266]	891
	892	// take file descriptor lock
[568]	893	remote_rwlock_wr_acquire( lock_xp );
[266]	894
	895	if ( whence == SEEK_CUR ) // new = current + offset
	896	{
[568]	897	new = hal_remote_l32( offset_xp ) + offset;
[266]	898	}
	899	else if ( whence == SEEK_SET ) // new = offset
	900	{
	901	new = offset;
	902	}
	903	else if ( whence == SEEK_END ) // new = size + offset
	904	{
[602]	905	new = hal_remote_l32( size_xp ) + offset;
[266]	906	}
	907	else
	908	{
	909	printk("\n[ERROR] in %s : illegal whence value\n", __FUNCTION__ );
[568]	910	remote_rwlock_wr_release( lock_xp );
[266]	911	return -1;
	912	}
	913
[602]	914	#if DEBUG_VFS_LSEEK
	915	uint32_t cycle = (uint32_t)hal_get_cycles();
	916	thread_t * this = CURRENT_THREAD;
	917	char name[CONFIG_VFS_MAX_NAME_LENGTH];
	918	vfs_inode_get_name( XPTR( file_cxy , inode_ptr ) , name );
	919	if( cycle > DEBUG_VFS_LSEEK )
	920	printk("\n[%s] thread[%x,%x] for <%s> / new offset %d / cycle %d\n",
	921	__FUNCTION__ , this->process->pid, this->trdid, name, new, cycle );
	922	#endif
	923
[266]	924	// set new offset
[568]	925	hal_remote_s32( offset_xp , new );
[266]	926
	927	// release file descriptor lock
[568]	928	remote_rwlock_wr_release( lock_xp );
[266]	929
	930	// success
[602]	931	if ( new_offset != NULL ) *new_offset = new;
[1]	932	return 0;
	933
[23]	934	} // vfs_lseek()
	935
	936	///////////////////////////////////
	937	error_t vfs_close( xptr_t file_xp,
	938	uint32_t file_id )
[1]	939	{
[459]	940	cluster_t * cluster; // local pointer on local cluster
	941	cxy_t file_cxy; // cluster containing the file descriptor.
	942	vfs_file_t * file_ptr; // local ponter on file descriptor
	943	cxy_t owner_cxy; // process owner cluster
	944	lpid_t lpid; // process local index
	945	xptr_t root_xp; // root of list of process copies
	946	xptr_t lock_xp; // lock protecting the list of copies
	947	xptr_t iter_xp; // iterator on list of process copies
	948	xptr_t process_xp; // extended pointer on one process copy
	949	cxy_t process_cxy; // process copy cluster
	950	process_t * process_ptr; // process copy local pointer
	951
[602]	952	// check arguments
	953	assert( (file_xp != XPTR_NULL) , "file_xp == XPTR_NULL\n" );
	954	assert( (file_id < CONFIG_PROCESS_FILE_MAX_NR) , "illegal file_id\n" );
[23]	955
	956	thread_t * this = CURRENT_THREAD;
	957	process_t * process = this->process;
	958
[459]	959	#if DEBUG_VFS_CLOSE
	960	uint32_t cycle = (uint32_t)hal_get_cycles();
	961	if( DEBUG_VFS_CLOSE < cycle )
[598]	962	printk("\n[%s] thread[%x,%x] enter / fdid %d / cycle %d\n",
	963	__FUNCTION__, process->pid, this->trdid, file_id, cycle );
[459]	964	#endif
[1]	965
[23]	966	// get local pointer on local cluster manager
[459]	967	cluster = LOCAL_CLUSTER;
[23]	968
	969	// get owner process cluster and lpid
[459]	970	owner_cxy = CXY_FROM_PID( process->pid );
	971	lpid = LPID_FROM_PID( process->pid );
[23]	972
	973	// get extended pointers on copies root and lock
[459]	974	root_xp = XPTR( owner_cxy , &cluster->pmgr.copies_root[lpid] );
	975	lock_xp = XPTR( owner_cxy , &cluster->pmgr.copies_lock[lpid] );
[23]	976
[459]	977	// 1) loop on the process descriptor copies to reset all fd_array[file_id] entries
	978
	979	// take the lock protecting the list of copies
[568]	980	remote_queuelock_acquire( lock_xp );
[23]	981
	982	XLIST_FOREACH( root_xp , iter_xp )
[1]	983	{
[459]	984	process_xp = XLIST_ELEMENT( iter_xp , process_t , copies_list );
	985	process_cxy = GET_CXY( process_xp );
	986	process_ptr = GET_PTR( process_xp );
[1]	987
[459]	988	#if (DEBUG_VFS_CLOSE & 1 )
	989	if( DEBUG_VFS_CLOSE < cycle )
[598]	990	printk("\n[%s] reset fd_array[%d] for process %x in cluster %x\n",
[459]	991	__FUNCTION__, file_id, process_ptr, process_cxy );
	992	#endif
[23]	993
[459]	994	// fd_array lock is required for atomic write of a 64 bits word
	995	// xptr_t fd_array_lock_xp = XPTR( process_cxy , &process_ptr->fd_array.lock );
	996
	997	xptr_t entry_xp = XPTR( process_cxy , &process_ptr->fd_array.array[file_id] );
	998
[568]	999	// remote_rwlock_wr_acquire( fd_array_lock_xp );
[459]	1000
[568]	1001	hal_remote_s64( entry_xp , XPTR_NULL );
[459]	1002
[568]	1003	// remote_rwlock_wr_release( fd_array_lock_xp );
[23]	1004
[459]	1005	vfs_file_count_down( file_xp );
	1006
[124]	1007	hal_fence();
[23]	1008	}
	1009
[459]	1010	// release the lock protecting the list of copies
[568]	1011	remote_queuelock_release( lock_xp );
[459]	1012
	1013	#if (DEBUG_VFS_CLOSE & 1)
	1014	if( DEBUG_VFS_CLOSE < cycle )
[598]	1015	printk("\n[%s] thread[%x,%x] reset all fd-array copies\n",
	1016	__FUNCTION__, process->pid, this->trdid );
[459]	1017	#endif
	1018
[23]	1019	// 2) release memory allocated to file descriptor in remote cluster
[459]	1020
	1021	// get cluster and local pointer on remote file descriptor
	1022	file_cxy = GET_CXY( file_xp );
	1023	file_ptr = GET_PTR( file_xp );
	1024
[23]	1025	if( file_cxy == local_cxy ) // file cluster is local
[1]	1026	{
[23]	1027	vfs_file_destroy( file_ptr );
	1028	}
	1029	else // file cluster is local
	1030	{
	1031	rpc_vfs_file_destroy_client( file_cxy , file_ptr );
	1032	}
[1]	1033
[459]	1034	#if DEBUG_VFS_CLOSE
	1035	cycle = (uint32_t)hal_get_cycles();
	1036	if( DEBUG_VFS_CLOSE < cycle )
[598]	1037	printk("\n[%s] thread[%x,%x] exit / fdid %d closed / cycle %d\n",
	1038	__FUNCTION__, process->pid, this->trdid, file_id, cycle );
[459]	1039	#endif
	1040
[23]	1041	return 0;
[1]	1042
[23]	1043	} // end vfs_close()
[1]	1044
	1045	////////////////////////////////////
[23]	1046	error_t vfs_unlink( xptr_t cwd_xp,
	1047	char * path )
[1]	1048	{
[602]	1049	error_t error;
	1050	xptr_t inode_xp; // extended pointer on target inode
	1051	cxy_t inode_cxy; // target inode cluster identifier
	1052	vfs_inode_t * inode_ptr; // target inode local pointer
	1053	uint32_t inode_refcount; // target inode refcount
	1054	vfs_inode_type_t type; // target inode type
	1055	mapper_t * mapper; // pointer on target inode mapper
	1056	xptr_t dentry_xp; // extended pointer on target dentry
	1057	cxy_t dentry_cxy; // target dentry cluster identifier
	1058	vfs_dentry_t * dentry_ptr; // target dentry local pointer
	1059	uint32_t dentry_refcount; // target dentry refcount
	1060	vfs_inode_t * dentry_parent_ptr; // parent inode local pointer
[1]	1061
[602]	1062	#if DEBUG_VFS_UNLINK
	1063	thread_t * this = CURRENT_THREAD;
	1064	uint32_t cycle = (uint32_t)hal_get_cycles();
	1065	if( DEBUG_VFS_UNLINK < cycle )
	1066	printk("\n[%s] thread[%x,%x] enter for <%s> / cycle %d\n",
	1067	__FUNCTION__, this->process->pid, this->trdid, path, cycle );
	1068	#endif
	1069
	1070	// get extended pointer on target inode
	1071	error = vfs_lookup( cwd_xp , path , 0 , &inode_xp );
	1072
	1073	if( error ) return error;
	1074
	1075	// get inode cluster and local pointer
	1076	inode_cxy = GET_CXY( inode_xp );
	1077	inode_ptr = GET_PTR( inode_xp );
	1078
	1079	// get inode type, refcount, mapper, dentry_xp
	1080	type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
	1081	inode_refcount = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->refcount ) );
	1082	mapper = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
	1083	dentry_xp = hal_remote_l64( XPTR( inode_cxy , &inode_ptr->parent_xp ) );
	1084
	1085	// get dentry cluster, local pointer, refcount, and pointers on parent inode
	1086	dentry_ptr = GET_PTR( dentry_xp );
	1087	dentry_cxy = GET_CXY( dentry_xp );
	1088	dentry_refcount = hal_remote_l32( XPTR( dentry_cxy , &dentry_ptr->refcount ) );
	1089	dentry_parent_ptr = hal_remote_lpt( XPTR( dentry_cxy , &dentry_ptr->parent ) );
	1090
	1091	// check inode & dentry refcount
	1092	assert( (inode_refcount == 1), "illegal inode refcount for <%s>\n", path );
	1093	assert( (dentry_refcount == 1), "illegal dentry refcount for <%s>\n", path );
	1094
	1095	/////////////////////////////
	1096	if( type == INODE_TYPE_FILE )
	1097	{
	1098	// 1. release clusters allocated to file in the FAT mapper
	1099	// synchronize the FAT on IOC device
	1100	error = vfs_fs_release_inode( inode_xp );
	1101	if( error )
	1102	{
	1103	printk("\n[ERROR] in %s : cannot update FAT mapper <%s>\n", path );
	1104	return -1;
	1105	}
	1106
	1107	#if(DEBUG_VFS_UNLINK & 1)
	1108	if( DEBUG_VFS_UNLINK < cycle )
	1109	printk("\n[%s] thread[%x,%x] removed <%s> inode from FAT (mapper and IOC device)\n",
	1110	__FUNCTION__, this->process->pid, this->trdid, path );
	1111	#endif
	1112
	1113	// 2. update parent directory in Inode Tree
	1114	// synchronize the parent directory on IOC device
	1115	if (dentry_cxy == local_cxy) // dentry is local
	1116	{
	1117	error = vfs_fs_remove_dentry( dentry_parent_ptr,
	1118	dentry_ptr );
	1119	}
	1120	else // dentry is remote
	1121	{
	1122	rpc_vfs_fs_remove_dentry_client( dentry_cxy,
	1123	dentry_parent_ptr,
	1124	dentry_ptr,
	1125	&error );
	1126	}
	1127	if( error )
	1128	{
	1129	printk("\n[ERROR] in %s : cannot update dentry on device for <%s>\n", path );
	1130	return -1;
	1131	}
	1132
	1133	#if(DEBUG_VFS_UNLINK & 1)
	1134	if( DEBUG_VFS_UNLINK < cycle )
	1135	printk("\n[%s] thread[%x,%x] removed <%s> inode from parent dir (mapper and IOC device)\n",
	1136	__FUNCTION__, this->process->pid, this->trdid, path );
	1137	#endif
	1138	// 3. remove inode (including mapper & dentry) from Inode Tree
	1139	vfs_remove_child_from_parent( inode_xp );
	1140
	1141	#if DEBUG_VFS_UNLINK
	1142	if( DEBUG_VFS_UNLINK < cycle )
	1143	printk("\n[%s] thread[%x,%x] exit / removed <%s> inode from Inode Tree / cycle %d\n",
	1144	__FUNCTION__, this->process->pid, this->trdid, path, cycle );
	1145	#endif
	1146	return 0;
	1147	}
	1148	/////////////////////////////////
	1149	else if( type == INODE_TYPE_DIR )
	1150	{
	1151	printk("\n[ERROR] in %s : unsupported type %s\n", vfs_inode_type_str( type ) );
	1152	return -1;
	1153	}
	1154	////
	1155	else
	1156	{
	1157	printk("\n[ERROR] in %s : unsupported type %s\n", vfs_inode_type_str( type ) );
	1158	return -1;
	1159	}
	1160
	1161	} // end vfs_unlink()
	1162
[598]	1163	//////////////////////////////////////
	1164	error_t vfs_stat( xptr_t inode_xp,
	1165	stat_t * st )
[1]	1166	{
[598]	1167	// get cluster and local pointer on inode descriptor
	1168	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
	1169	cxy_t inode_cxy = GET_CXY( inode_xp );
	1170
	1171	// get relevant infos from inode descriptor
	1172	uint32_t inum = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->inum ) );
	1173	uint32_t size = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->size ) );
	1174	uint32_t uid = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->uid ) );
	1175	uint32_t gid = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->gid ) );
	1176	uint32_t type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
	1177	uint32_t rights = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->rights ) );
	1178
	1179	// set stat structure fields
	1180	st->st_ino = inum;
	1181	st->st_gid = gid;
	1182	st->st_uid = uid;
	1183	st->st_size = size;
	1184	st->st_mode = (type << 16) \| rights;
	1185
	1186	#if DEBUG_VFS_STAT
	1187	uint32_t cycle = (uint32_t)hal_get_cycles();
	1188	thread_t * this = CURRENT_THREAD;
	1189	if( DEBUG_VFS_STAT < cycle )
	1190	printk("\n[%s] thread[%x,%x] set stat %x for inode %x in cluster %x / cycle %d\n"
	1191	" %s / inum %d / size %d\n",
	1192	__FUNCTION__, this->process->pid, this->trdid, st, inode_ptr, inode_cxy, cycle,
	1193	vfs_inode_type_str( type ), inum, size );
	1194	#endif
	1195
[1]	1196	return 0;
	1197
[602]	1198	} // end vfs_stat()
	1199
[407]	1200	/////////////////////////////////////////////
	1201	error_t vfs_readdir( xptr_t file_xp,
	1202	struct dirent * k_dirent )
[1]	1203	{
[492]	1204	assert( false , "not implemented file_xp: %x, k_dirent ptr %x\n",
	1205	file_xp, k_dirent );
[1]	1206	return 0;
	1207	}
	1208
	1209	//////////////////////////////////////
[23]	1210	error_t vfs_mkdir( xptr_t file_xp,
	1211	char * path,
	1212	uint32_t mode )
[1]	1213	{
[492]	1214	assert( false , "not implemented file_xp: %x, path <%s>, mode: %x\n",
	1215	file_xp, path, mode );
[1]	1216	return 0;
	1217	}
	1218
[23]	1219	////////////////////////////////////
	1220	error_t vfs_rmdir( xptr_t file_xp,
	1221	char * path )
[1]	1222	{
[492]	1223	assert( false , "not implemented file_xp: %x, path <%s>\n",
	1224	file_xp, path );
[1]	1225	return 0;
	1226	}
	1227
[23]	1228	///////////////////////////////////
	1229	error_t vfs_chdir( xptr_t cwd_xp,
	1230	char * path )
[1]	1231	{
[23]	1232	error_t error;
	1233	xptr_t inode_xp; // extended pointer on target inode
	1234	cxy_t inode_cxy; // target inode cluster identifier
	1235	vfs_inode_t * inode_ptr; // target inode local pointer
	1236	uint32_t mode; // lookup working mode
	1237	vfs_inode_type_t inode_type; // target inode type
	1238
	1239	// set lookup working mode
	1240	mode = 0;
	1241
	1242	// get extended pointer on target inode
	1243	error = vfs_lookup( cwd_xp , path , mode , &inode_xp );
	1244
	1245	if( error ) return error;
	1246
	1247	// get inode cluster and local pointer
	1248	inode_cxy = GET_CXY( inode_xp );
[473]	1249	inode_ptr = GET_PTR( inode_xp );
[23]	1250
	1251	// get inode type from remote file
[568]	1252	inode_type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
[23]	1253
	1254	if( inode_type != INODE_TYPE_DIR )
	1255	{
	1256	CURRENT_THREAD->errno = ENOTDIR;
	1257	return -1;
	1258	}
	1259
[568]	1260	// TODO implement this function using process CWD lock
	1261
	1262	assert( false , "not implemented\n" );
	1263
[1]	1264	return 0;
	1265	}
	1266
[23]	1267	///////////////////////////////////
	1268	error_t vfs_chmod( xptr_t cwd_xp,
	1269	char * path,
	1270	uint32_t rights )
[1]	1271	{
[23]	1272	error_t error;
	1273	xptr_t inode_xp; // extended pointer on target inode
	1274	cxy_t inode_cxy; // inode cluster identifier
	1275	vfs_inode_t * inode_ptr; // inode local pointer
	1276	vfs_inode_type_t inode_type; // target inode type
	1277
	1278	// set lookup working mode
[473]	1279	assert( (rights == 0), __FUNCTION__,
	1280	"access rights non implemented yet\n" );
[23]	1281
	1282	// get extended pointer on target inode
[473]	1283	error = vfs_lookup( cwd_xp , path , 0 , &inode_xp );
[23]	1284
	1285	if( error ) return error;
	1286
	1287	// get inode cluster and local pointer
	1288	inode_cxy = GET_CXY( inode_xp );
[473]	1289	inode_ptr = GET_PTR( inode_xp );
[23]	1290
	1291	// get inode type from remote inode
[568]	1292	inode_type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
[23]	1293
	1294
[492]	1295	assert( false , "not implemented\n" );
[1]	1296	return 0;
	1297	}
	1298
[23]	1299	///////////////////////////////////
	1300	error_t vfs_mkfifo( xptr_t cwd_xp,
	1301	char * path,
	1302	uint32_t rights )
	1303	{
[492]	1304	assert( false , "not implemented cwd_xp: %x, path <%s>, rights %x\n",
	1305	cwd_xp, path, rights );
[23]	1306	return 0;
	1307	}
[1]	1308
	1309
	1310
[188]	1311	//////////////////////////////////////////////////////////////////////////////////////////
[602]	1312	// Distributed Inode Tree access related functions
[1]	1313	//////////////////////////////////////////////////////////////////////////////////////////
	1314
[188]	1315	//////////////////////////////////////////////////////////////////////////
	1316	// This static function is called by the vfs_display() function.
[337]	1317	// that is supposed to take the TXT0 lock.
[188]	1318	//////////////////////////////////////////////////////////////////////////
	1319	static void vfs_recursive_display( xptr_t inode_xp,
	1320	xptr_t name_xp,
	1321	uint32_t indent )
	1322	{
	1323	cxy_t inode_cxy;
	1324	vfs_inode_t * inode_ptr;
	1325	vfs_inode_type_t inode_type;
[598]	1326	uint32_t inode_size;
	1327	uint32_t inode_inum;
	1328	uint32_t inode_attr;
	1329	uint32_t inode_dirty;
[204]	1330	xptr_t children_xp; // extended pointer on children xhtab
[188]	1331
[204]	1332	xptr_t child_dentry_xp;
	1333	cxy_t child_dentry_cxy;
	1334	vfs_dentry_t * child_dentry_ptr;
	1335	xptr_t child_inode_xp;
	1336	xptr_t child_dentry_name_xp;
[598]	1337	mapper_t * mapper_ptr;
[188]	1338
	1339	char name[CONFIG_VFS_MAX_NAME_LENGTH];
	1340
	1341	char * indent_str[] = { "", // level 0
	1342	" ", // level 1
	1343	" ", // level 2
	1344	" ", // level 3
	1345	" ", // level 4
	1346	" ", // level 5
	1347	" ", // level 6
	1348	" ", // level 7
	1349	" ", // level 8
	1350	" ", // level 9
	1351	" ", // level 10
	1352	" ", // level 11
	1353	" ", // level 12
	1354	" ", // level 13
	1355	" ", // level 14
	1356	" " }; // level 15
	1357
[598]	1358	assert( (inode_xp != XPTR_NULL) , "inode_xp cannot be NULL\n" );
	1359	assert( (name_xp != XPTR_NULL) , "name_xp cannot be NULL\n" );
	1360	assert( (indent < 16) , "depth cannot be larger than 15\n" );
[188]	1361
	1362	// get inode cluster and local pointer
	1363	inode_cxy = GET_CXY( inode_xp );
[473]	1364	inode_ptr = GET_PTR( inode_xp );
[188]	1365
[598]	1366	// get inode type, size, attr, mapper, and inum
	1367	inode_type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
	1368	inode_size = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->size ) );
	1369	inode_inum = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->inum ) );
	1370	inode_attr = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->attr ) );
	1371	mapper_ptr = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
[188]	1372
	1373	// make a local copy of node name
	1374	hal_remote_strcpy( XPTR( local_cxy , name ) , name_xp );
	1375
[598]	1376	// compute dirty
	1377	inode_dirty = ((inode_attr & INODE_ATTR_DIRTY) != 0);
	1378
[188]	1379	// display inode
[598]	1380	nolock_printk("%s%s <%s> : inum %d / %d bytes / dirty %d / cxy %x (inode %x / mapper %x)\n",
[367]	1381	indent_str[indent], vfs_inode_type_str( inode_type ), name,
[598]	1382	inode_inum, inode_size, inode_dirty, inode_cxy, inode_ptr, mapper_ptr );
[188]	1383
	1384	// scan directory entries
	1385	if( inode_type == INODE_TYPE_DIR )
	1386	{
	1387	// get extended pointer on directory entries xhtab
[204]	1388	children_xp = XPTR( inode_cxy , &inode_ptr->children );
[188]	1389
	1390	// get xhtab lock
[568]	1391	xhtab_lock( children_xp );
[188]	1392
	1393	// get first dentry from xhtab
[204]	1394	child_dentry_xp = xhtab_get_first( children_xp );
[188]	1395
[204]	1396	while( child_dentry_xp != XPTR_NULL )
[188]	1397	{
	1398	// get dentry cluster and local pointer
[204]	1399	child_dentry_cxy = GET_CXY( child_dentry_xp );
[473]	1400	child_dentry_ptr = GET_PTR( child_dentry_xp );
[188]	1401
	1402	// get extended pointer on child inode
[568]	1403	child_inode_xp = hal_remote_l64( XPTR( child_dentry_cxy,
[204]	1404	&child_dentry_ptr->child_xp ) );
[188]	1405
	1406	// get extended pointer on dentry name
[204]	1407	child_dentry_name_xp = XPTR( child_dentry_cxy , &child_dentry_ptr->name );
[188]	1408
[568]	1409	// recursive call on inode display
[204]	1410	vfs_recursive_display( child_inode_xp,
	1411	child_dentry_name_xp,
	1412	indent+1 );
[188]	1413
	1414	// get next dentry
[204]	1415	child_dentry_xp = xhtab_get_next( children_xp );
[188]	1416	}
	1417
	1418	// release xhtab lock
[568]	1419	xhtab_unlock( children_xp );
[188]	1420	}
	1421	} // end vfs_recursive_display()
	1422
	1423	///////////////////////////////////
	1424	void vfs_display( xptr_t inode_xp )
	1425	{
[204]	1426	xptr_t name_xp;
[188]	1427	xptr_t dentry_xp;
	1428	cxy_t dentry_cxy;
	1429	vfs_dentry_t * dentry_ptr;
	1430
	1431	// get target inode cluster and local pointer
	1432	cxy_t inode_cxy = GET_CXY( inode_xp );
[473]	1433	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
[188]	1434
	1435	// get extended pointer on associated dentry
[568]	1436	dentry_xp = hal_remote_l64( XPTR( inode_cxy , &inode_ptr->parent_xp ) );
[188]	1437
	1438	// check if target inode is the File System root
	1439	if( dentry_xp == XPTR_NULL )
	1440	{
	1441	// build extended pointer on root name
	1442	name_xp = XPTR( local_cxy , "/" );
	1443	}
	1444	else
	1445	{
	1446	// get dentry cluster and local pointer
	1447	dentry_cxy = GET_CXY( dentry_xp );
[473]	1448	dentry_ptr = GET_PTR( dentry_xp );
[188]	1449
	1450	// get extended pointer on dentry name
	1451	name_xp = XPTR( dentry_cxy , &dentry_ptr->name );
	1452	}
	1453
[337]	1454	// get pointers on TXT0 chdev
[407]	1455	xptr_t txt0_xp = chdev_dir.txt_tx[0];
[337]	1456	cxy_t txt0_cxy = GET_CXY( txt0_xp );
	1457	chdev_t * txt0_ptr = GET_PTR( txt0_xp );
	1458
	1459	// get extended pointer on remote TXT0 chdev lock
	1460	xptr_t lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
	1461
	1462	// get TXT0 lock in busy waiting mode
[568]	1463	remote_busylock_acquire( lock_xp );
[337]	1464
[188]	1465	// print header
[401]	1466	nolock_printk("\n***** file system state\n\n");
[188]	1467
	1468	// call recursive function
[473]	1469	vfs_recursive_display( inode_xp , name_xp , 0 );
[188]	1470
[337]	1471	// release lock
[568]	1472	remote_busylock_release( lock_xp );
[337]	1473
[204]	1474	} // end vfs_display()
[188]	1475
[602]	1476	/*
[1]	1477	//////////////////////////////////////////////////////////////////////////////////////////
[602]	1478	// This static function is used by the vfs_lookup() function.
[1]	1479	// It takes an extended pointer on a remote inode (parent directory inode),
	1480	// and check access_rights violation for the calling thread.
	1481	// It can be used by any thread running in any cluster.
	1482	//////////////////////////////////////////////////////////////////////////////////////////
	1483	// @ inode_xp : extended pointer on inode.
	1484	// @ client_uid : client thread user ID
	1485	// @ client_gid : client thread group ID
	1486	// @ return true if access rights are violated.
	1487	//////////////////////////////////////////////////////////////////////////////////////////
[602]	1488	static bool_t vfs_access_denied( xptr_t inode_xp,
[1]	1489	uint32_t client_uid,
	1490	uint32_t client_gid )
	1491	{
	1492	// get found inode cluster and local pointer
	1493	cxy_t inode_cxy = GET_CXY( inode_xp );
[473]	1494	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
[1]	1495
	1496	// get inode access mode, UID, and GID
[568]	1497	// TODO uint32_t mode = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->mode ) );
	1498	uid_t uid = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->uid ) );
	1499	gid_t gid = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->gid ) );
[1]	1500
	1501	// FIXME : me must use mode
	1502	if( (uid == client_uid) \|\| (gid == client_gid) ) return false;
	1503	else return true;
	1504	}
[602]	1505	*/
[1]	1506
	1507	//////////////////////////////////////////////////////////////////////////////////////////
	1508	// This static function is used by the vfs_lookup() function.
[204]	1509	// It takes an extended pointer on a remote parent directory inode, a directory
[1]	1510	// entry name, and returns an extended pointer on the child inode.
	1511	// It can be used by any thread running in any cluster.
	1512	//////////////////////////////////////////////////////////////////////////////////////////
	1513	// @ parent_xp : extended pointer on parent inode in remote cluster.
	1514	// @ name : dentry name
	1515	// @ child_xp : [out] buffer for extended pointer on child inode.
	1516	// @ return true if success / return false if not found.
	1517	//////////////////////////////////////////////////////////////////////////////////////////
	1518	static bool_t vfs_get_child( xptr_t parent_xp,
	1519	char * name,
	1520	xptr_t * child_xp )
	1521	{
	1522	xptr_t xhtab_xp; // extended pointer on hash table containing children dentries
	1523	xptr_t dentry_xp; // extended pointer on children dentry
	1524
	1525	// get parent inode cluster and local pointer
	1526	cxy_t parent_cxy = GET_CXY( parent_xp );
[473]	1527	vfs_inode_t * parent_ptr = GET_PTR( parent_xp );
[1]	1528
	1529	// get extended pointer on hash table of children directory entries
	1530	xhtab_xp = XPTR( parent_cxy , &parent_ptr->children );
	1531
	1532	// search extended pointer on matching dentry
	1533	dentry_xp = xhtab_lookup( xhtab_xp , name );
	1534
	1535	if( dentry_xp == XPTR_NULL ) return false;
	1536
	1537	// get dentry cluster and local pointer
	1538	cxy_t dentry_cxy = GET_CXY( dentry_xp );
[473]	1539	vfs_dentry_t * dentry_ptr = GET_PTR( dentry_xp );
[1]	1540
	1541	// return child inode
[568]	1542	*child_xp = (xptr_t)hal_remote_l64( XPTR( dentry_cxy , &dentry_ptr->child_xp ) );
[1]	1543	return true;
	1544
[204]	1545	} // end vfs_get_child()
	1546
[1]	1547	//////////////////////////////////////////////////////////////////////////////////////////
	1548	// This static function is used by the vfs_lookup() function.
	1549	// It takes the <current> pointer on a buffer containing a complete pathname, and return
	1550	// in the <name> buffer, allocated by the caller, a single name in the path.
	1551	// It return also in the <next> pointer the next character to analyse in the path.
	1552	// Finally it returns a <last> boolean, that is true when the returned <name> is the
	1553	// last name in the path. The names are supposed to be separated by one or several '/'
	1554	// characters, that are not written in the <name> buffer.
	1555	//////////////////////////////////////////////////////////////////////////////////////////
	1556	// @ current : pointer on first character to analyse in buffer containing the path.
	1557	// @ name : [out] pointer on buffer allocated by the caller for the returned name.
	1558	// @ next : [out] pointer on next character to analyse in buffer containing the path.
	1559	// @ last : [out] true if the returned name is the last (NUL character found).
	1560	// @ return 0 if success / return EINVAL if string empty (first chracter is NUL).
	1561	//////////////////////////////////////////////////////////////////////////////////////////
	1562	static error_t vfs_get_name_from_path( char * current,
	1563	char * name,
	1564	char ** next,
	1565	bool_t * last )
	1566	{
	1567	char * ptr = current;
	1568
	1569	// skip leading '/' characters
	1570	while( *ptr == '/' ) ptr++;
	1571
	1572	// return EINVAL if string empty
	1573	if( *ptr == 0 ) return EINVAL;
	1574
	1575	// copy all characters in name until NUL or '/'
	1576	while( (ptr != 0) && (ptr !='/') ) (name++) = (ptr++);
	1577
[204]	1578	// set NUL terminating character in name buffer
	1579	*(name++) = 0;
	1580
[1]	1581	// return last an next
	1582	if( *ptr == 0 ) // last found character is NUL => last name in path
	1583	{
	1584	*last = true;
	1585	}
	1586	else // last found character is '/' => skip it
	1587	{
	1588	*last = false;
	1589	*next = ptr + 1;
	1590	}
	1591
	1592	return 0;
[204]	1593
	1594	} // end vfs_get name_from_path()
[188]	1595
[23]	1596	//////////////////////////////////////////////
	1597	error_t vfs_lookup( xptr_t cwd_xp,
	1598	char * pathname,
	1599	uint32_t mode,
	1600	xptr_t * inode_xp )
[1]	1601	{
[101]	1602	char name[CONFIG_VFS_MAX_NAME_LENGTH]; // one name in path
[1]	1603
[23]	1604	xptr_t parent_xp; // extended pointer on parent inode
	1605	cxy_t parent_cxy; // cluster for parent inode
	1606	vfs_inode_t * parent_ptr; // local pointer on parent inode
[602]	1607	xptr_t dentry_xp; // extended pointer on dentry
[23]	1608	xptr_t child_xp; // extended pointer on child inode
	1609	cxy_t child_cxy; // cluster for child inode
[602]	1610	vfs_inode_t * child_ptr; // local pointer on child inode
	1611	vfs_inode_type_t child_type; // child inode type
[23]	1612	vfs_fs_type_t fs_type; // File system type
	1613	vfs_ctx_t * ctx_ptr; // local pointer on FS context
	1614	char * current; // current pointer on path
	1615	char * next; // next value for current pointer
	1616	bool_t last; // true when the name is the last in path
	1617	bool_t found; // true when a child has been found
[459]	1618	bool_t dir; // searched inode is a directory
	1619	bool_t create; // searched inode must be created if not found
	1620	bool_t excl; // searched inode must not exist
[23]	1621	thread_t * this; // pointer on calling thread descriptor
	1622	process_t * process; // pointer on calling process descriptor
	1623	error_t error;
[1]	1624
	1625	this = CURRENT_THREAD;
	1626	process = this->process;
	1627
[438]	1628	#if DEBUG_VFS_LOOKUP
[433]	1629	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	1630	if( DEBUG_VFS_LOOKUP < cycle )
[598]	1631	printk("\n[%s] thread[%x,%x] enter for <%s> / cycle %d\n",
	1632	__FUNCTION__, process->pid, this->trdid, pathname, cycle );
[433]	1633	#endif
[380]	1634
[459]	1635	// compute lookup flags
	1636	dir = mode & VFS_LOOKUP_DIR;
	1637	create = mode & VFS_LOOKUP_CREATE;
	1638	excl = mode & VFS_LOOKUP_EXCL;
	1639
[1]	1640	// get extended pointer on first inode to search
	1641	if( pathname[0] == '/' ) parent_xp = process->vfs_root_xp;
	1642	else parent_xp = cwd_xp;
	1643
[101]	1644	// initialise other loop variables
[1]	1645	current = pathname;
	1646	next = NULL;
	1647	last = false;
	1648	child_xp = XPTR_NULL;
	1649
	1650	// take lock on parent inode
[101]	1651	vfs_inode_lock( parent_xp );
[1]	1652
[401]	1653	// sequencially loop on nodes in pathname
[459]	1654	// load from device if one node in path not found in inode tree
[401]	1655	// exit loop when last name found (i.e. last == true)
[1]	1656	do
	1657	{
[401]	1658	// get one name from path, and "last" flag
[1]	1659	vfs_get_name_from_path( current , name , &next , &last );
	1660
[438]	1661	#if (DEBUG_VFS_LOOKUP & 1)
	1662	if( DEBUG_VFS_LOOKUP < cycle )
[602]	1663	printk("\n[%s] thread[%x,%x] look for <%s> in <%s> / last = %d\n",
	1664	__FUNCTION__, process->pid, this->trdid, name, pathname, last );
[433]	1665	#endif
[101]	1666
[204]	1667	// search a child dentry matching name in parent inode
[1]	1668	found = vfs_get_child( parent_xp,
	1669	name,
	1670	&child_xp );
	1671
[459]	1672	if (found == false ) // child not found in inode tree
[1]	1673	{
[101]	1674
[438]	1675	#if (DEBUG_VFS_LOOKUP & 1)
	1676	if( DEBUG_VFS_LOOKUP < cycle )
[602]	1677	printk("\n[%s] thread[%x,%x] miss <%s> node => try to create it\n",
	1678	__FUNCTION__, process->pid, this->trdid, name );
[433]	1679	#endif
[459]	1680	// if a child node is not found in the inode tree,
	1681	// we introduce a new (dentry/inode) in inode tree,
	1682	// and try to find it by scanning the parent directory mapper.
	1683	// . if it is found in parent mapper:
	1684	// - if the child is a directory, the child mapper is loaded from device
	1685	// - if the child is not a directory, the search is completed
	1686	// . if it is not found in the parent mapper:
	1687	// - if ( not last or not create ) an error is reported
[602]	1688	// - if (last and create) a new file or directory is created
[407]	1689
[1]	1690	// release lock on parent inode
[101]	1691	vfs_inode_unlock( parent_xp );
[459]	1692
[602]	1693	// get parent inode cluster and local pointer
[23]	1694	parent_cxy = GET_CXY( parent_xp );
[459]	1695	parent_ptr = GET_PTR( parent_xp );
[602]	1696
	1697	// get parent inode FS type
	1698	ctx_ptr = hal_remote_lpt( XPTR( parent_cxy,&parent_ptr->ctx ) );
[568]	1699	fs_type = hal_remote_l32( XPTR( parent_cxy , &ctx_ptr->type ) );
[23]	1700
[238]	1701	// select a cluster for missing inode
[561]	1702	child_cxy = cluster_random_select();
[602]	1703
	1704	// define child inode type
	1705	if( dir ) child_type = INODE_TYPE_DIR;
	1706	else child_type = INODE_TYPE_FILE;
[401]	1707
[459]	1708	// insert a new child dentry/inode in inode tree
[188]	1709	error = vfs_add_child_in_parent( child_cxy,
[602]	1710	child_type,
[23]	1711	fs_type,
	1712	parent_xp,
[222]	1713	name,
[602]	1714	&dentry_xp,
[23]	1715	&child_xp );
[1]	1716	if( error )
	1717	{
[602]	1718	printk("\n[ERROR] in %s : cannot create node <%s> in path <%s>\n",
[459]	1719	__FUNCTION__ , name, pathname );
[602]	1720	return -1;
[238]	1721	}
	1722
[602]	1723	// get child inode local pointer
[459]	1724	child_ptr = GET_PTR( child_xp );
	1725
	1726	#if (DEBUG_VFS_LOOKUP & 1)
	1727	if( DEBUG_VFS_LOOKUP < cycle )
[602]	1728	printk("\n[%s] thread[%x,%x] created missing inode <%s> in cluster %x\n",
	1729	__FUNCTION__, process->pid, this->trdid, name, child_cxy );
[459]	1730	#endif
[602]	1731	// scan parent mapper to find the missing dentry, and complete
	1732	// the initialisation of dentry and child inode desciptors
[238]	1733	if( parent_cxy == local_cxy )
[602]	1734
[238]	1735	{
[602]	1736	error = vfs_fs_child_init( parent_ptr,
	1737	name,
	1738	child_xp );
[238]	1739	}
	1740	else
	1741	{
[602]	1742	rpc_vfs_fs_child_init_client( parent_cxy,
	1743	parent_ptr,
	1744	name,
	1745	child_xp,
	1746	&error );
[238]	1747	}
	1748
[459]	1749	if ( error ) // child not found in parent mapper
[238]	1750	{
[602]	1751	if ( last && create ) // add a new dentry in parent
[459]	1752	{
[602]	1753	error = vfs_new_child_init( parent_xp,
	1754	dentry_xp,
	1755	child_xp );
	1756	if ( error )
	1757	{
	1758	printk("\n[ERROR] in %s : cannot init inode <%s> in path <%s>\n",
	1759	__FUNCTION__, name, pathname );
	1760	vfs_remove_child_from_parent( child_xp );
	1761	return -1;
	1762	}
[1]	1763
[459]	1764	#if (DEBUG_VFS_LOOKUP & 1)
	1765	if( DEBUG_VFS_LOOKUP < cycle )
[602]	1766	printk("\n[%s] thread[%x,%x] created inode <%s> in path\n",
	1767	__FUNCTION__, process->pid, this->trdid, name );
[459]	1768	#endif
[238]	1769	}
[602]	1770	else // not last or not create => error
[459]	1771	{
	1772	printk("\n[ERROR] in %s : <%s> node not found in parent for <%s>\n",
	1773	__FUNCTION__ , name , pathname );
	1774	vfs_remove_child_from_parent( child_xp );
	1775	return ENOENT;
	1776	}
[238]	1777	}
[602]	1778	else // child found in parent mapper
[459]	1779	{
	1780	// load child mapper from device if child is a directory (prefetch)
[568]	1781	if( hal_remote_l32( XPTR( child_cxy , &child_ptr->type ) ) == INODE_TYPE_DIR )
[459]	1782	{
	1783	if( child_cxy == local_cxy )
	1784	{
[602]	1785	error = vfs_inode_load_all_pages( child_ptr );
[459]	1786	}
	1787	else
	1788	{
[602]	1789	rpc_vfs_inode_load_all_pages_client( child_cxy,
	1790	child_ptr,
	1791	&error );
[459]	1792	}
	1793	if ( error )
	1794	{
	1795	printk("\n[ERROR] in %s : cannot load <%s> from device\n",
	1796	__FUNCTION__ , name );
	1797	vfs_remove_child_from_parent( child_xp );
	1798	return EIO;
	1799	}
[238]	1800
[438]	1801	#if (DEBUG_VFS_LOOKUP & 1)
	1802	if( DEBUG_VFS_LOOKUP < cycle )
[602]	1803	printk("\n[%s] thread[%x,%x] loaded from IOC device mapper for <%s> in <%s>\n",
	1804	__FUNCTION__ , process->pid, this->trdid, name, pathname );
[433]	1805	#endif
[459]	1806	}
	1807	}
[407]	1808
[459]	1809	// take lock on parent inode
	1810	vfs_inode_lock( parent_xp );
[1]	1811	}
[459]	1812	else // child found in inode tree
	1813	{
	1814
[438]	1815	#if (DEBUG_VFS_LOOKUP & 1)
	1816	if( DEBUG_VFS_LOOKUP < cycle )
[602]	1817	printk("\n[%s] thread[%x,%x] found <%s> / inode %x in cluster %x\n",
	1818	__FUNCTION__, process->pid, this->trdid, name, GET_PTR(child_xp), GET_CXY(child_xp) );
[433]	1819	#endif
[459]	1820	child_ptr = GET_PTR( child_xp );
	1821	child_cxy = GET_CXY( child_xp );
	1822	parent_cxy = GET_CXY( parent_xp );
	1823	parent_ptr = GET_PTR( parent_xp );
[101]	1824
[459]	1825	if( last && (mode & VFS_LOOKUP_CREATE) && (mode & VFS_LOOKUP_EXCL) )
	1826	{
	1827	printk("\n[ERROR] in %s : node already exist <%s>\n", __FUNCTION__, name );
	1828	return EINVAL;
	1829	}
	1830	}
	1831
[380]	1832	// TODO check access rights here [AG]
[23]	1833	// error = vfs_access_denied( child_xp,
	1834	// client_uid,
	1835	// client_gid );
	1836	// if( error )
	1837	// {
[441]	1838	// printk("\n[ERROR] in %s : thread %x / permission denied for %s\n",
	1839	// __FUNCTION__ , this , name );
[23]	1840	// return EACCES;
	1841	// }
[1]	1842
[238]	1843	// take lock on child inode and release lock on parent
	1844	vfs_inode_lock( child_xp );
[101]	1845	vfs_inode_unlock( parent_xp );
[1]	1846
	1847	// update loop variables
	1848	parent_xp = child_xp;
	1849	current = next;
	1850	}
	1851	while( last == false );
	1852
[238]	1853	// release lock
	1854	vfs_inode_unlock( parent_xp );
[1]	1855
[438]	1856	#if DEBUG_VFS_LOOKUP
[433]	1857	cycle = (uint32_t)hal_get_cycles();
[438]	1858	if( DEBUG_VFS_LOOKUP < cycle )
[602]	1859	printk("\n[%s] thread[%x,%x] exit for <%s> cycle %d\n",
	1860	__FUNCTION__ , process->pid, this->trdid, pathname, cycle );
[433]	1861	#endif
[1]	1862
[238]	1863	// return searched pointer
[459]	1864	if( mode & VFS_LOOKUP_PARENT ) *inode_xp = parent_xp;
	1865	else *inode_xp = child_xp;
[1]	1866
	1867	return 0;
	1868
	1869	} // end vfs_lookup()
	1870
[602]	1871
	1872
	1873	///////////////////////////////////////////////
	1874	error_t vfs_new_child_init( xptr_t parent_xp,
	1875	xptr_t dentry_xp,
	1876	xptr_t child_xp )
	1877	{
	1878	error_t error;
	1879	uint32_t cluster;
	1880	uint32_t child_type;
	1881	uint32_t child_size;
	1882
	1883	#if DEBUG_VFS_NEW_CHILD_INIT
	1884	char parent_name[CONFIG_VFS_MAX_NAME_LENGTH];
	1885	char child_name[CONFIG_VFS_MAX_NAME_LENGTH];
	1886	vfs_inode_get_name( parent_xp , parent_name );
	1887	vfs_inode_get_name( child_xp , child_name );
	1888	uint32_t cycle = (uint32_t)hal_get_cycles();
	1889	thread_t * this = CURRENT_THREAD;
	1890	if( DEBUG_VFS_NEW_CHILD_INIT < cycle )
	1891	printk("\n[%s] thread[%x,%x] enter / parent <%s> / child <%s> / cycle %d\n",
	1892	__FUNCTION__ , this->process->pid, this->trdid, parent_name, child_name, cycle );
	1893	#endif
	1894
	1895	// get parent inode cluster and local pointer
	1896	cxy_t parent_cxy = GET_CXY( parent_xp );
	1897	vfs_inode_t * parent_ptr = GET_PTR( parent_xp );
	1898
	1899	// get dentry local pointer
	1900	vfs_dentry_t * dentry_ptr = GET_PTR( dentry_xp );
	1901
	1902	// get child inode cluster and local pointer
	1903	cxy_t child_cxy = GET_CXY( child_xp );
	1904	vfs_inode_t * child_ptr = GET_PTR( child_xp );
	1905
	1906	// 1. allocate one free cluster to child inode
	1907	// depending on the child inode FS type
	1908	vfs_ctx_t * ctx = hal_remote_lpt( XPTR( child_cxy , &child_ptr->ctx ) );
	1909
	1910	error = vfs_fs_cluster_alloc( ctx->type,
	1911	&cluster );
	1912	if ( error )
	1913	{
	1914	printk("\n[ERROR] in %s : cannot find a free VFS cluster\n",
	1915	__FUNCTION__ );
	1916	return -1;
	1917	}
	1918
	1919	#if( DEBUG_VFS_NEW_CHILD_INIT & 1)
	1920	if( DEBUG_VFS_NEW_CHILD_INIT < cycle )
	1921	printk("\n[%s] thread[%x,%x] allocated one FAT cluster to <%s>\n",
	1922	__FUNCTION__ , this->process->pid, this->trdid, child_name );
	1923	#endif
	1924
	1925	// 2. update the child inode descriptor
	1926	child_type = hal_remote_l32( XPTR( child_cxy , &child_ptr->type ) );
	1927	child_size = (child_type == INODE_TYPE_DIR) ? 4096 : 0;
	1928
	1929	hal_remote_s32( XPTR( child_cxy , &child_ptr->size ) , child_size );
	1930	hal_remote_spt( XPTR( child_cxy , &child_ptr->extend ) , (void*)(intptr_t)cluster );
	1931
	1932	// 3. update the parent inode mapper, and
	1933	// update the dentry extension if required
	1934	if( local_cxy == parent_cxy )
	1935	{
	1936	error = vfs_fs_add_dentry( parent_ptr,
	1937	dentry_ptr );
	1938	}
	1939	else
	1940	{
	1941	rpc_vfs_fs_add_dentry_client( parent_cxy,
	1942	parent_ptr,
	1943	dentry_ptr,
	1944	&error );
	1945	}
	1946	if ( error )
	1947	{
	1948	printk("\n[ERROR] in %s : cannot register child in parent directory\n",
	1949	__FUNCTION__ );
	1950	return -1;
	1951	}
	1952
	1953	#if DEBUG_VFS_NEW_CHILD_INIT
	1954	cycle = (uint32_t)hal_get_cycles();
	1955	if( DEBUG_VFS_NEW_CHILD_INIT < cycle )
	1956	printk("\n[%s] thread[%x,%x] exit / parent <%s> / child <%> / cycle %d\n",
	1957	__FUNCTION__ , this->process->pid, this->trdid, parent_name, child_name, cycle );
	1958	#endif
	1959
	1960	return 0;
	1961
	1962	} // end vfs_new_child_init()
	1963
[1]	1964	////////////////////////////////////////////
	1965	error_t vfs_get_path( xptr_t searched_xp,
	1966	char * buffer,
	1967	uint32_t max_size )
	1968	{
	1969	xptr_t dentry_xp; // extended pointer on current dentry
	1970	char * name; // local pointer on current dentry name
	1971	uint32_t length; // length of current dentry name
	1972	uint32_t count; // number of characters written in buffer
	1973	uint32_t index; // slot index in buffer
[23]	1974	xptr_t inode_xp; // extended pointer on
[1]	1975
	1976	// implementation note:
	1977	// we use two variables "index" and "count" because the buffer
[401]	1978	// is written in decreasing index order (from leaf to root)
[433]	1979	// TODO : handle conflict with a concurrent rename [AG]
	1980	// FIXME : handle synchro in the loop [AG]
[1]	1981
	1982	// set the NUL character in buffer / initialise buffer index and count
	1983	buffer[max_size - 1] = 0;
	1984	count = 1;
	1985	index = max_size - 2;
	1986
	1987	// initialize current inode
	1988	inode_xp = searched_xp;
	1989
	1990	// exit when root inode found (i.e. dentry_xp == XPTR_NULL)
	1991	do
	1992	{
	1993	// get inode cluster and local pointer
	1994	cxy_t inode_cxy = GET_CXY( inode_xp );
[473]	1995	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
[1]	1996
	1997	// get extended pointer on parent dentry
[568]	1998	dentry_xp = (xptr_t)hal_remote_l64( XPTR( inode_cxy , inode_ptr->parent_xp ) );
[1]	1999
	2000	// get dentry cluster and local pointer
	2001	cxy_t dentry_cxy = GET_CXY( dentry_xp );
[473]	2002	vfs_dentry_t * dentry_ptr = GET_PTR( dentry_xp );
[1]	2003
	2004	// get dentry name length and pointer
[568]	2005	length = hal_remote_l32( XPTR( dentry_cxy , &dentry_ptr->length ) );
[1]	2006	name = (char *)hal_remote_lpt( XPTR( dentry_cxy , &dentry_ptr->name ) );
	2007
	2008	// update index and count
	2009	index -= (length + 1);
	2010	count += (length + 1);
	2011
	2012	// check buffer overflow
	2013	if( count >= max_size )
	2014	{
	2015	printk("\n[ERROR] in %s : kernel buffer too small\n", __FUNCTION__ );
	2016	return EINVAL;
	2017	}
	2018
	2019	// update pathname
	2020	hal_remote_memcpy( XPTR( local_cxy , &buffer[index + 1] ) ,
	2021	XPTR( dentry_cxy , name ) , length );
	2022	buffer[index] = '/';
	2023
	2024	// get extended pointer on next inode
[568]	2025	inode_xp = (xptr_t)hal_remote_l64( XPTR( dentry_cxy , dentry_ptr->parent ) );
[1]	2026	}
	2027	while( (dentry_xp != XPTR_NULL) );
	2028
	2029	return 0;
	2030
	2031	} // end vfs_get_path()
	2032
[188]	2033
[602]	2034	////////////////////////////////////////////////////////////////////
	2035	error_t vfs_add_child_in_parent( cxy_t child_inode_cxy,
	2036	vfs_inode_type_t child_inode_type,
[23]	2037	vfs_fs_type_t fs_type,
[602]	2038	xptr_t parent_inode_xp,
[23]	2039	char * name,
[602]	2040	xptr_t * dentry_xp,
	2041	xptr_t * child_inode_xp )
[1]	2042	{
[23]	2043	error_t error;
[602]	2044	xptr_t new_dentry_xp; // extended pointer on created dentry
	2045	vfs_dentry_t * new_dentry_ptr; // created dentry local pointer
	2046	xptr_t new_inode_xp; // extended pointer on created child inode
	2047	cxy_t parent_inode_cxy; // parent inode cluster identifier
	2048	vfs_inode_t * parent_inode_ptr; // parent inode local pointer
[1]	2049
	2050	// get parent inode cluster and local pointer
[602]	2051	parent_inode_cxy = GET_CXY( parent_inode_xp );
	2052	parent_inode_ptr = GET_PTR( parent_inode_xp );
[1]	2053
[438]	2054	#if DEBUG_VFS_ADD_CHILD
[602]	2055	char parent_name[CONFIG_VFS_MAX_NAME_LENGTH];
	2056	vfs_inode_get_name( parent_inode_xp , parent_name );
[433]	2057	uint32_t cycle = (uint32_t)hal_get_cycles();
[568]	2058	thread_t * this = CURRENT_THREAD;
[438]	2059	if( DEBUG_VFS_ADD_CHILD < cycle )
[602]	2060	printk("\n[%s] thread[%x,%x] enter / child <%s> cxy %x / parent <%s> cxy %x / cycle %d\n",
	2061	__FUNCTION__, this->process->pid, this->trdid, name, child_inode_cxy,
	2062	parent_name, parent_inode_cxy, (uint32_t)hal_get_cycles() );
[433]	2063	#endif
[279]	2064
[204]	2065	// 1. create dentry
[602]	2066	if( parent_inode_cxy == local_cxy ) // parent cluster is the local cluster
[1]	2067	{
[23]	2068	error = vfs_dentry_create( fs_type,
[1]	2069	name,
[602]	2070	parent_inode_ptr,
	2071	&new_dentry_xp );
[1]	2072	}
	2073	else // parent cluster is remote
	2074	{
[602]	2075	rpc_vfs_dentry_create_client( parent_inode_cxy,
[23]	2076	fs_type,
[1]	2077	name,
[602]	2078	parent_inode_ptr,
	2079	&new_dentry_xp,
[1]	2080	&error );
	2081	}
	2082
	2083	if( error )
	2084	{
[437]	2085	printk("\n[ERROR] in %s : cannot create dentry <%s> in cluster %x\n",
[602]	2086	__FUNCTION__ , name , parent_inode_cxy );
	2087	return -1;
[1]	2088	}
	2089
[602]	2090	// get dentry local pointer
	2091	new_dentry_ptr = GET_PTR( new_dentry_xp );
	2092
[568]	2093	#if(DEBUG_VFS_ADD_CHILD & 1)
	2094	if( DEBUG_VFS_ADD_CHILD < cycle )
[598]	2095	printk("\n[%s] thread[%x,%x] / dentry <%s> created in cluster %x\n",
[602]	2096	__FUNCTION__, this->process->pid, this->trdid, name, parent_inode_cxy );
[568]	2097	#endif
	2098
[204]	2099	// 2. create child inode TODO : define attr / mode / uid / gid
[1]	2100	uint32_t attr = 0;
	2101	uint32_t mode = 0;
	2102	uint32_t uid = 0;
	2103	uint32_t gid = 0;
	2104
[602]	2105	if( child_inode_cxy == local_cxy ) // child cluster is the local cluster
[1]	2106	{
[602]	2107	error = vfs_inode_create( new_dentry_xp,
[23]	2108	fs_type,
[602]	2109	child_inode_type,
[1]	2110	attr,
	2111	mode,
	2112	uid,
	2113	gid,
[602]	2114	&new_inode_xp );
[1]	2115	}
	2116	else // child cluster is remote
	2117	{
[602]	2118	rpc_vfs_inode_create_client( child_inode_cxy,
	2119	new_dentry_xp,
[23]	2120	fs_type,
[602]	2121	child_inode_type,
[1]	2122	attr,
	2123	mode,
	2124	uid,
	2125	gid,
[602]	2126	&new_inode_xp,
[1]	2127	&error );
	2128	}
	2129
	2130	if( error )
	2131	{
	2132	printk("\n[ERROR] in %s : cannot create inode in cluster %x\n",
[602]	2133	__FUNCTION__ , child_inode_cxy );
[1]	2134
[602]	2135	if( parent_inode_cxy == local_cxy ) vfs_dentry_destroy( new_dentry_ptr );
	2136	else rpc_vfs_dentry_destroy_client( parent_inode_cxy , new_dentry_ptr );
	2137	return -1;
[1]	2138	}
	2139
[568]	2140	#if(DEBUG_VFS_ADD_CHILD & 1)
	2141	if( DEBUG_VFS_ADD_CHILD < cycle )
[598]	2142	printk("\n[%s] thread[%x,%x] / inode <%s> created in cluster %x\n",
[602]	2143	__FUNCTION__ , this->process->pid, this->trdid, name , child_inode_cxy );
[568]	2144	#endif
	2145
[602]	2146	// 3. update "child_xp" field in dentry and increment refcounts
	2147	hal_remote_s64( XPTR( parent_inode_cxy , &new_dentry_ptr->child_xp ) , new_inode_xp );
	2148	vfs_inode_remote_up( new_inode_xp );
	2149	vfs_dentry_remote_up( new_dentry_xp );
[204]	2150
[438]	2151	#if DEBUG_VFS_ADD_CHILD
[433]	2152	cycle = (uint32_t)hal_get_cycles();
[438]	2153	if( DEBUG_VFS_ADD_CHILD < cycle )
[598]	2154	printk("\n[%s] thread[%x,%x] exit for <%s> / cycle %d\n",
	2155	__FUNCTION__, this->process->pid, this->trdid, name, (uint32_t)hal_get_cycles() );
[433]	2156	#endif
[296]	2157
[602]	2158	// return extended pointer on dentry & child inode
	2159	*dentry_xp = new_dentry_xp;
	2160	*child_inode_xp = new_inode_xp;
[1]	2161	return 0;
	2162
	2163	} // end vfs_add_child_in_parent()
	2164
[602]	2165	////////////////////////////////////////////////////
	2166	void vfs_remove_child_from_parent( xptr_t inode_xp )
[459]	2167	{
	2168	cxy_t inode_cxy;
	2169	vfs_inode_t * inode_ptr;
	2170	xptr_t dentry_xp;
	2171	cxy_t dentry_cxy;
	2172	vfs_dentry_t * dentry_ptr;
	2173
	2174	// get inode cluster and local pointer
	2175	inode_cxy = GET_CXY( inode_xp );
	2176	inode_ptr = GET_PTR( inode_xp );
	2177
[602]	2178	// get associated dentry cluster and pointers
[568]	2179	dentry_xp = hal_remote_l64( XPTR( inode_cxy , &inode_ptr->parent_xp ) );
[459]	2180	dentry_cxy = GET_CXY( dentry_xp );
	2181	dentry_ptr = GET_PTR( dentry_xp );
	2182
[602]	2183	// check dentry refcount
	2184	assert( ( hal_remote_l32( XPTR( dentry_cxy , &dentry_ptr->refcount ) ) == 1 ),
	2185	"dentry refcount must be 1\n" );
[459]	2186
[602]	2187	// check inode refcount
	2188	assert( ( hal_remote_l32( XPTR( inode_cxy , &inode_ptr->refcount ) ) == 1 ),
	2189	"inode refcount must be 1\n" );
	2190
	2191	// decrement refcount for inode and dentry
	2192	vfs_inode_remote_down( inode_xp );
	2193	vfs_dentry_remote_down( dentry_xp );
	2194
[459]	2195	// delete dentry
	2196	if( dentry_cxy == local_cxy )
	2197	{
[602]	2198	vfs_dentry_destroy( dentry_ptr );
[459]	2199	}
	2200	else
	2201	{
	2202	rpc_vfs_dentry_destroy_client( dentry_cxy,
[602]	2203	dentry_ptr );
[459]	2204	}
	2205
	2206	// delete inode
	2207	if( inode_cxy == local_cxy )
	2208	{
	2209	vfs_inode_destroy( inode_ptr );
	2210	}
	2211	else
	2212	{
	2213	rpc_vfs_inode_destroy_client( inode_cxy,
[602]	2214	inode_ptr );
[459]	2215	}
	2216
	2217	} // end vfs_remove_child_from_parent()
	2218
[23]	2219	//////////////////////////////////////////////////////////////////////////////////////////
[602]	2220	// API used by VFS to access a specific FS
[23]	2221	//////////////////////////////////////////////////////////////////////////////////////////
	2222
[602]	2223	///////////////////////////////////////////
	2224	error_t vfs_fs_move_page( xptr_t page_xp,
	2225	bool_t to_mapper )
[23]	2226	{
[204]	2227	error_t error = 0;
[23]	2228
[602]	2229	assert( (page_xp != XPTR_NULL) , "page pointer is NULL\n" );
[23]	2230
[602]	2231	page_t * page_ptr = GET_PTR( page_xp );
	2232	cxy_t page_cxy = GET_CXY( page_xp );
[23]	2233
[602]	2234	// get local pointer on page mapper
	2235	mapper_t * mapper = hal_remote_lpt( XPTR( page_cxy , &page_ptr->mapper ) );
[23]	2236
[602]	2237	assert( (mapper != NULL) , "no mapper for page\n" );
[246]	2238
[23]	2239	// get FS type
[602]	2240	vfs_fs_type_t fs_type = hal_remote_l32( XPTR( page_cxy , &mapper->type ) );
[23]	2241
[238]	2242	// call relevant FS function
[23]	2243	if( fs_type == FS_TYPE_FATFS )
	2244	{
[602]	2245	error = fatfs_move_page( page_xp , to_mapper );
	2246	}
	2247	else if( fs_type == FS_TYPE_RAMFS )
	2248	{
	2249	assert( false , "should not be called for RAMFS\n" );
	2250	}
	2251	else if( fs_type == FS_TYPE_DEVFS )
	2252	{
	2253	assert( false , "should not be called for DEVFS\n" );
	2254	}
	2255	else
	2256	{
	2257	assert( false , "undefined file system type\n" );
	2258	}
[568]	2259
[602]	2260	return error;
[568]	2261
[602]	2262	} // end vfs_fs_move_page()
	2263
	2264	////////////////////////////////////////////////
	2265	error_t vfs_fs_add_dentry( vfs_inode_t * inode,
	2266	vfs_dentry_t * dentry )
	2267	{
	2268	error_t error = 0;
	2269
	2270	assert( (inode != NULL) , "inode pointer is NULL\n" );
	2271	assert( (dentry != NULL) , "dentry pointer is NULL\n" );
	2272
	2273	mapper_t * mapper = inode->mapper;
	2274
	2275	assert( (mapper != NULL) , "mapper pointer is NULL\n" );
	2276
	2277	// get FS type
	2278	vfs_fs_type_t fs_type = mapper->type;
	2279
	2280	// call relevant FS function
	2281	if( fs_type == FS_TYPE_FATFS )
	2282	{
	2283	error = fatfs_add_dentry( inode , dentry );
[23]	2284	}
	2285	else if( fs_type == FS_TYPE_RAMFS )
	2286	{
[492]	2287	assert( false , "should not be called for RAMFS\n" );
[23]	2288	}
	2289	else if( fs_type == FS_TYPE_DEVFS )
	2290	{
[492]	2291	assert( false , "should not be called for DEVFS\n" );
[23]	2292	}
	2293	else
	2294	{
[492]	2295	assert( false , "undefined file system type\n" );
[23]	2296	}
	2297
	2298	return error;
	2299
[602]	2300	} // end vfs_fs_add_dentry()
[23]	2301
[602]	2302	///////////////////////////////////////////////////
	2303	error_t vfs_fs_remove_dentry( vfs_inode_t * inode,
	2304	vfs_dentry_t * dentry )
[23]	2305	{
[602]	2306	error_t error = 0;
[23]	2307
[602]	2308	assert( (inode != NULL) , "inode pointer is NULL\n" );
	2309	assert( (dentry != NULL) , "dentry pointer is NULL\n" );
[23]	2310
[238]	2311	mapper_t * mapper = inode->mapper;
[23]	2312
[598]	2313	assert( (mapper != NULL) , "mapper pointer is NULL\n" );
[23]	2314
[602]	2315	// get FS type
	2316	vfs_fs_type_t fs_type = mapper->type;
[401]	2317
[602]	2318	// call relevant FS function
	2319	if( fs_type == FS_TYPE_FATFS )
	2320	{
	2321	error = fatfs_remove_dentry( inode , dentry );
	2322	}
	2323	else if( fs_type == FS_TYPE_RAMFS )
	2324	{
	2325	assert( false , "should not be called for RAMFS\n" );
	2326	}
	2327	else if( fs_type == FS_TYPE_DEVFS )
	2328	{
	2329	assert( false , "should not be called for DEVFS\n" );
	2330	}
	2331	else
	2332	{
	2333	assert( false , "undefined file system type\n" );
	2334	}
[238]	2335
[602]	2336	return error;
	2337
	2338	} // end vfs_fs_remove_dentry()
	2339
	2340	////////////////////////////////////////////////
	2341	error_t vfs_fs_child_init( vfs_inode_t * parent,
	2342	char * name,
	2343	xptr_t child_xp )
	2344	{
	2345	error_t error = 0;
	2346
	2347	// check arguments
	2348	assert( (parent != NULL) , "parent pointer is NULL\n");
	2349	assert( (child_xp != XPTR_NULL) , "child pointer is NULL\n");
	2350
	2351	// get parent inode FS type
	2352	vfs_fs_type_t fs_type = parent->ctx->type;
	2353
	2354	// call relevant FS function
	2355	if( fs_type == FS_TYPE_FATFS )
[23]	2356	{
[602]	2357	error = fatfs_child_init( parent , name , child_xp );
	2358	}
	2359	else if( fs_type == FS_TYPE_RAMFS )
	2360	{
	2361	assert( false , "should not be called for RAMFS\n" );
	2362	}
	2363	else if( fs_type == FS_TYPE_DEVFS )
	2364	{
	2365	assert( false , "should not be called for DEVFS\n" );
	2366	}
	2367	else
	2368	{
	2369	assert( false , "undefined file system type\n" );
	2370	}
[23]	2371
[602]	2372	return error;
	2373
	2374	} // end vfs_fs_child_init()
	2375
	2376	/////////////////////////////////////////////////
	2377	error_t vfs_fs_cluster_alloc( uint32_t fs_type,
	2378	uint32_t * cluster )
	2379	{
	2380	error_t error = 0;
	2381
	2382	// call relevant FS function
	2383	if( fs_type == FS_TYPE_FATFS )
	2384	{
	2385	error = fatfs_cluster_alloc( cluster );
[23]	2386	}
[602]	2387	else if( fs_type == FS_TYPE_RAMFS )
	2388	{
	2389	assert( false , "should not be called for RAMFS\n" );
	2390	}
	2391	else if( fs_type == FS_TYPE_DEVFS )
	2392	{
	2393	assert( false , "should not be called for DEVFS\n" );
	2394	}
	2395	else
	2396	{
	2397	assert( false , "undefined file system type\n" );
	2398	}
[23]	2399
[602]	2400	return error;
[401]	2401
[602]	2402	} // end vfs_fs_alloc_cluster()
[23]	2403
[602]	2404	////////////////////////////////////////////////
	2405	error_t vfs_fs_release_inode( xptr_t inode_xp )
	2406	{
	2407	error_t error = 0;
[23]	2408
[602]	2409	assert( (inode_xp != XPTR_NULL) , "inode pointer is NULL\n")
	2410
	2411	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
	2412	cxy_t inode_cxy = GET_CXY( inode_xp );
	2413
	2414	// get local pointer on page mapper
	2415	mapper_t * mapper = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
	2416
	2417	assert( (mapper != NULL) , "mapper pointer is NULL\n")
	2418
	2419	// get FS type from mapper
	2420	vfs_fs_type_t fs_type = hal_remote_l32( XPTR( inode_cxy , &mapper->type ) );
	2421
	2422	// call relevant FS function
	2423	if( fs_type == FS_TYPE_FATFS )
	2424	{
	2425	error = fatfs_release_inode( inode_xp );
	2426	}
	2427	else if( fs_type == FS_TYPE_RAMFS )
	2428	{
	2429	assert( false , "should not be called for RAMFS\n" );
	2430	}
	2431	else if( fs_type == FS_TYPE_DEVFS )
	2432	{
	2433	assert( false , "should not be called for DEVFS\n" );
	2434	}
	2435	else
	2436	{
	2437	assert( false , "undefined file system type\n" );
	2438	}
	2439
	2440	return error;
	2441
	2442	} // end vfs_fs_release_inode()
	2443
	2444

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