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source: trunk/kernel/vfs/vfs.c @ 202

Last change on this file since 202 was 188, checked in by alain, 7 years ago
Redefine the PIC device API.
File size: 51.1 KB

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

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