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source: trunk/kernel/vfs/vfs.c @ 290

Last change on this file since 290 was 279, checked in by alain, 7 years ago
1) Introduce independant command fields for the various devices in the thread descriptor. 2) Introduce a new dev_pic_enable_ipi() function in the generic PIC device 3) Fix two bugs identified by Maxime in the scheduler initialisation, and in the sched_select(). 4) fix several bugs in the TSAR hal_kentry.S. 5) Introduce a third kgiet segment (besides kdata and kcode) in the TSAR bootloader.
File size: 57.8 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
[279]	156	vfs_dmsg("\n[INFO] %s : enter / local_cluster = %x / parent_cluster = %x\n",
	157	__FUNCTION__ , local_cxy , GET_CXY( dentry_xp ) );
	158
[23]	159	// check fs type and get pointer on context
	160	if ( fs_type == FS_TYPE_FATFS ) ctx = &fs_context[FS_TYPE_FATFS];
	161	else if( fs_type == FS_TYPE_RAMFS ) ctx = &fs_context[FS_TYPE_RAMFS];
	162	else if( fs_type == FS_TYPE_DEVFS ) ctx = &fs_context[FS_TYPE_DEVFS];
[1]	163	else
	164	{
	165	ctx = NULL;
[246]	166	printk("\n[PANIC] in %s : illegal file system type = %d\n", __FUNCTION__ , fs_type );
[1]	167	hal_core_sleep();
	168	}
	169
	170	// allocate inum
	171	error = vfs_ctx_inum_alloc( ctx , &inum );
	172
	173	if( error )
	174	{
	175	printk("\n[ERROR] in %s : cannot allocate inum\n", __FUNCTION__ );
	176	return ENOMEM;
	177	}
	178
	179	// allocate memory for mapper
[246]	180	mapper = mapper_create( fs_type );
[1]	181
	182	if( mapper == NULL )
	183	{
	184	printk("\n[ERROR] in %s : cannot allocate mapper\n", __FUNCTION__ );
	185	vfs_ctx_inum_release( ctx , inum );
	186	return ENOMEM;
	187	}
	188
[23]	189	// allocate memory for VFS inode descriptor
[1]	190	req.type = KMEM_VFS_INODE;
	191	req.size = sizeof(vfs_inode_t);
	192	req.flags = AF_KERNEL \| AF_ZERO;
	193	inode = (vfs_inode_t *)kmem_alloc( &req );
	194
	195	if( inode == NULL )
	196	{
	197	printk("\n[ERROR] in %s : cannot allocate inode descriptor\n", __FUNCTION__ );
	198	vfs_ctx_inum_release( ctx , inum );
	199	mapper_destroy( mapper );
	200	return ENOMEM;
	201	}
	202
	203	// initialize inode descriptor
	204	inode->gc = 0;
[23]	205	inode->type = inode_type;
[1]	206	inode->inum = inum;
	207	inode->attr = attr;
[23]	208	inode->rights = rights;
[1]	209	inode->uid = uid;
	210	inode->gid = gid;
	211	inode->refcount = 0;
	212	inode->parent_xp = dentry_xp;
	213	inode->ctx = ctx;
[246]	214	inode->mapper = mapper;
[188]	215	inode->extend = extend;
[1]	216
[246]	217	// initialise inode field in mapper
	218	mapper->inode = inode;
	219
[1]	220	// initialise threads waiting queue
	221	xlist_root_init( XPTR( local_cxy , &inode->wait_root ) );
	222
[204]	223	// initialize dentries hash table
	224	xhtab_init( &inode->children , XHTAB_DENTRY_TYPE );
[1]	225
	226	// initialize inode locks
[10]	227	remote_rwlock_init( XPTR( local_cxy , &inode->data_lock ) );
[1]	228	remote_spinlock_init( XPTR( local_cxy , &inode->main_lock ) );
	229
[279]	230	vfs_dmsg("\n[INFO] %s : enter / local_cluster = %x / parent_cluster = %x\n",
	231	__FUNCTION__ , local_cxy , GET_CXY( dentry_xp ) );
	232
[1]	233	// return extended pointer on inode
	234	*inode_xp = XPTR( local_cxy , inode );
	235	return 0;
	236
	237	} // end vfs_inode_create()
	238
	239	/////////////////////////////////////////////
	240	void vfs_inode_destroy( vfs_inode_t * inode )
	241	{
	242	if( inode->refcount )
	243	{
	244	printk("\n[PANIC] in %s : inode refcount non zero\n", __FUNCTION__ );
	245	hal_core_sleep();
	246	}
	247
	248	// release memory allocated for mapper
	249	mapper_destroy( inode->mapper );
	250
	251	// release memory allocate for inode descriptor
	252	kmem_req_t req;
	253	req.ptr = inode;
	254	req.type = KMEM_VFS_INODE;
	255	kmem_free( &req );
	256
	257	} // end vfs_inode_destroy()
	258
[238]	259	/////////////////////////////////////////////
	260	error_t vfs_inode_load( vfs_inode_t * parent,
	261	char * name,
	262	xptr_t child_xp )
	263	{
[246]	264	vfs_dmsg("\n[INFO] %s : enter for child <%s>\n",
	265	__FUNCTION__ , name );
	266
[238]	267	error_t error = 0;
	268
	269	assert( (parent != NULL) , __FUNCTION__ , "parent pointer is NULL\n");
	270
	271	assert( (child_xp != XPTR_NULL) , __FUNCTION__ , "child pointer is NULL\n");
	272
	273	// get parent inode FS type
	274	vfs_fs_type_t fs_type = parent->ctx->type;
	275
	276	// call relevant FS function
	277	if( fs_type == FS_TYPE_FATFS )
	278	{
	279	error = fatfs_inode_load( parent , name , child_xp );
	280	}
	281	else if( fs_type == FS_TYPE_RAMFS )
	282	{
	283	assert( false , __FUNCTION__ , "should not be called for RAMFS\n" );
	284	}
	285	else if( fs_type == FS_TYPE_DEVFS )
	286	{
	287	assert( false , __FUNCTION__ , "should not be called for DEVFS\n" );
	288	}
	289	else
	290	{
	291	assert( false , __FUNCTION__ , "undefined file system type\n" );
	292	}
	293
[246]	294	vfs_dmsg("\n[INFO] %s : exit for child <%s>\n",
	295	__FUNCTION__ , name );
	296
[238]	297	return error;
	298
	299	} // end vfs_load_inode()
	300
[1]	301	////////////////////////////////////////////
	302	void vfs_inode_remote_up( xptr_t inode_xp )
	303	{
	304	// get inode cluster and local pointer
	305	cxy_t inode_cxy = GET_CXY( inode_xp );
	306	vfs_inode_t * inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	307
	308	hal_remote_atomic_add( XPTR( inode_cxy , &inode_ptr->refcount ) , 1 );
	309	}
	310
	311	//////////////////////////////////////////////
	312	void vfs_inode_remote_down( xptr_t inode_xp )
	313	{
	314	// get inode cluster and local pointer
	315	cxy_t inode_cxy = GET_CXY( inode_xp );
	316	vfs_inode_t * inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	317
	318	hal_remote_atomic_add( XPTR( inode_cxy , &inode_ptr->refcount ) , -1 );
	319	}
	320
	321	//////////////////////////////////////////////
	322	uint32_t vfs_inode_get_size( xptr_t inode_xp )
	323	{
	324	// get inode cluster and local pointer
	325	cxy_t cxy = GET_CXY( inode_xp );
	326	vfs_inode_t * ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	327
	328	// get size
[10]	329	remote_rwlock_rd_lock( XPTR( cxy , &ptr->data_lock ) );
[1]	330	uint32_t size = hal_remote_lw( XPTR( cxy , &ptr->size ) );
[10]	331	remote_rwlock_rd_unlock( XPTR( cxy , &ptr->data_lock ) );
[1]	332	return size;
	333	}
	334
[101]	335	////////////////////////////////////////////
	336	void vfs_inode_set_size( xptr_t inode_xp,
[1]	337	uint32_t size )
	338	{
	339	// get inode cluster and local pointer
	340	cxy_t cxy = GET_CXY( inode_xp );
	341	vfs_inode_t * ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	342
	343	// set size
[10]	344	remote_rwlock_wr_unlock( XPTR( cxy , &ptr->data_lock ) );
[1]	345	hal_remote_sw( XPTR( cxy , &ptr->size ) , size );
[10]	346	remote_rwlock_wr_unlock( XPTR( cxy , &ptr->data_lock ) );
[1]	347	}
	348
[101]	349	////////////////////////////////////////
	350	void vfs_inode_unlock( xptr_t inode_xp )
[1]	351	{
	352	// get inode cluster and local pointer
	353	cxy_t cxy = GET_CXY( inode_xp );
	354	vfs_inode_t * ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	355
	356	// release the main lock
	357	remote_spinlock_unlock( XPTR( cxy , &ptr->main_lock ) );
	358	}
	359
[101]	360	//////////////////////////////////////
	361	void vfs_inode_lock( xptr_t inode_xp )
[1]	362	{
	363	// get inode cluster and local pointer
	364	cxy_t cxy = GET_CXY( inode_xp );
	365	vfs_inode_t * ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	366
	367	// get the main lock
	368	remote_spinlock_lock( XPTR( cxy , &ptr->main_lock ) );
	369	}
	370
[101]	371	/////////////////////////////////////////
	372	xptr_t vfs_inode_owner( xptr_t inode_xp )
	373	{
	374	// get inode cluster and local pointer
	375	cxy_t cxy = GET_CXY( inode_xp );
	376	vfs_inode_t * ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	377
	378	// get the main lock
	379	return remote_spinlock_owner( XPTR( cxy , &ptr->main_lock ) );
	380	}
	381
[204]	382	/////////////////////////////////////////
	383	void vfs_inode_display( xptr_t inode_xp )
	384	{
	385	cxy_t inode_cxy;
	386	vfs_inode_t * inode_ptr;
	387	xptr_t dentry_xp;
	388	cxy_t dentry_cxy;
	389	vfs_dentry_t * dentry_ptr;
	390
	391	char name[CONFIG_VFS_MAX_NAME_LENGTH];
	392
	393	// get inode cluster and local pointer
	394	inode_cxy = GET_CXY( inode_xp );
	395	inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	396
	397	// get parent dentry
	398	dentry_xp = hal_remote_lwd( XPTR( inode_cxy , &inode_ptr->parent_xp ) );
	399
	400	// get local copy of name
	401	if( dentry_xp == XPTR_NULL ) // it is the VFS root
	402	{
	403	strcpy( name , "/" );
	404	}
	405	else // not the VFS root
	406	{
	407	dentry_cxy = GET_CXY( dentry_xp );
	408	dentry_ptr = (vfs_dentry_t *)GET_PTR( dentry_xp );
	409
	410	hal_remote_strcpy( XPTR( local_cxy , name ) ,
	411	XPTR( dentry_cxy , &dentry_ptr->name ) );
	412	}
	413
	414	// display inode header
	415	printk("\n* inode <%s> / inode_xp = %l / dentry_xp = %l *\n",
	416	name , inode_xp , dentry_xp );
	417
	418	// display children from xhtab
	419	xhtab_display( XPTR( inode_cxy , &inode_ptr->children ) );
	420
	421	} // end vfs_inode_display()
	422
	423	////////////////////////////////////////////////////////////////////////////////////////////
[1]	424	// Dentry related functions
	425	//////////////////////////////////////////////////////////////////////////////////////////
	426
[23]	427	///////////////////////////////////////////////////
	428	error_t vfs_dentry_create( vfs_fs_type_t fs_type,
	429	char * name,
	430	vfs_inode_t * parent,
	431	xptr_t * dentry_xp )
[1]	432	{
	433	vfs_ctx_t * ctx; // context descriptor
	434	vfs_dentry_t * dentry; // dentry descriptor (to be allocated)
	435	kmem_req_t req; // request to kernel memory allocator
	436
[188]	437	// get pointer on context
[23]	438	if ( fs_type == FS_TYPE_FATFS ) ctx = &fs_context[FS_TYPE_FATFS];
	439	else if( fs_type == FS_TYPE_RAMFS ) ctx = &fs_context[FS_TYPE_RAMFS];
	440	else if( fs_type == FS_TYPE_DEVFS ) ctx = &fs_context[FS_TYPE_DEVFS];
[1]	441	else
	442	{
	443	ctx = NULL;
	444	printk("\n[PANIC] in %s : undefined file system type\n", __FUNCTION__ );
	445	hal_core_sleep();
	446	}
	447
	448	// get name length
	449	uint32_t length = strlen( name );
	450
[23]	451	if( length >= CONFIG_VFS_MAX_NAME_LENGTH )
[1]	452	{
	453	printk("\n[ERROR] in %s : name too long\n", __FUNCTION__ );
	454	return EINVAL;
	455	}
	456
	457	// allocate memory for dentry descriptor
	458	req.type = KMEM_VFS_DENTRY;
	459	req.size = sizeof(vfs_dentry_t);
	460	req.flags = AF_KERNEL \| AF_ZERO;
	461	dentry = (vfs_dentry_t *)kmem_alloc( &req );
	462
	463	if( dentry == NULL )
	464	{
	465	printk("\n[ERROR] in %s : cannot allocate dentry descriptor\n", __FUNCTION__ );
	466	return ENOMEM;
	467	}
	468
	469	// initialize dentry descriptor
[23]	470
[1]	471	dentry->ctx = ctx;
	472	dentry->length = length;
	473	dentry->parent = parent;
	474	strcpy( dentry->name , name );
	475
[23]	476	// register dentry in hash table rooted in parent inode
	477	xhtab_insert( XPTR( local_cxy , &parent->children ),
	478	name,
[188]	479	XPTR( local_cxy , &dentry->list ) );
[23]	480
	481	// return extended pointer on dentry
[1]	482	*dentry_xp = XPTR( local_cxy , dentry );
	483
	484	return 0;
	485
	486	} // end vfs_dentry_create()
	487
	488	////////////////////////////////////////////////
	489	void vfs_dentry_destroy( vfs_dentry_t * dentry )
	490	{
	491	if( dentry->refcount )
	492	{
	493	printk("\n[PANIC] in %s : dentry refcount non zero\n", __FUNCTION__ );
	494	hal_core_sleep();
	495	}
	496
	497	kmem_req_t req;
	498	req.ptr = dentry;
	499	req.type = KMEM_VFS_DENTRY;
	500	kmem_free( &req );
	501	}
	502
	503
[188]	504
[1]	505	//////////////////////////////////////////////////////////////////////////////////////////
	506	// File descriptor related functions
	507	//////////////////////////////////////////////////////////////////////////////////////////
	508
[23]	509	/////////////////////////////////////////////
	510	error_t vfs_file_create( vfs_inode_t * inode,
	511	uint32_t attr,
	512	xptr_t * file_xp )
	513	{
	514	vfs_file_t * file;
	515	kmem_req_t req;
	516
	517	// allocate memory for new file descriptor
	518	req.type = KMEM_VFS_FILE;
	519	req.size = sizeof(vfs_file_t);
	520	req.flags = AF_KERNEL \| AF_ZERO;
	521	file = (vfs_file_t *)kmem_alloc( &req );
	522
	523	if( file == NULL ) return ENOMEM;
	524
	525	// initializes new file descriptor
	526	file->gc = 0;
	527	file->type = inode->type;
	528	file->attr = attr;
	529	file->offset = 0;
	530	file->refcount = 0;
	531	file->inode = inode;
	532	file->ctx = inode->ctx;
	533	file->mapper = inode->mapper;
	534
	535	remote_rwlock_init( XPTR( local_cxy , &file->lock ) );
	536
	537	*file_xp = XPTR( local_cxy , file );
	538	return 0;
	539
	540	} // end vfs_file_create()
	541
	542	///////////////////////////////////////////
	543	void vfs_file_destroy( vfs_file_t * file )
	544	{
	545	if( file->refcount )
	546	{
	547	printk("\n[PANIC] in %s : file refcount non zero\n", __FUNCTION__ );
	548	hal_core_sleep();
	549	}
	550
	551	kmem_req_t req;
	552	req.ptr = file;
	553	req.type = KMEM_VFS_FILE;
	554	kmem_free( &req );
	555
	556	} // end vfs_file_destroy()
	557
	558
[1]	559	////////////////////////////////////////
	560	void vfs_file_count_up( xptr_t file_xp )
	561	{
	562	// get file cluster and local pointer
	563	cxy_t file_cxy = GET_CXY( file_xp );
	564	vfs_file_t * file_ptr = (vfs_file_t *)GET_PTR( file_xp );
	565
	566	// atomically increment count
	567	hal_remote_atomic_add( XPTR( file_cxy , &file_ptr->refcount ) , 1 );
	568	}
	569
	570	//////////////////////////////////////////
	571	void vfs_file_count_down( xptr_t file_xp )
	572	{
	573	// get file cluster and local pointer
	574	cxy_t file_cxy = GET_CXY( file_xp );
	575	vfs_file_t * file_ptr = (vfs_file_t *)GET_PTR( file_xp );
	576
	577	// atomically decrement count
	578	hal_remote_atomic_add( XPTR( file_cxy , &file_ptr->refcount ) , -1 );
	579	}
	580
[23]	581	//////////////////////////////////////////////////////////////////////////////////////////
	582	// File access related functions
	583	//////////////////////////////////////////////////////////////////////////////////////////
	584
	585	////////////////////////////////////
	586	error_t vfs_open( xptr_t cwd_xp,
	587	char * path,
	588	uint32_t flags,
	589	uint32_t mode,
	590	xptr_t * new_file_xp,
	591	uint32_t * new_file_id )
[1]	592	{
[23]	593	error_t error;
	594	xptr_t inode_xp; // extended pointer on target inode
	595	cxy_t inode_cxy; // inode cluster identifier
	596	vfs_inode_t * inode_ptr; // inode local pointer
	597	uint32_t file_attr; // file descriptor attributes
	598	uint32_t lookup_mode; // lookup working mode
	599	xptr_t file_xp; // extended pointer on created file descriptor
	600	uint32_t file_id; // created file descriptor index in reference fd_array
[1]	601
[101]	602	vfs_dmsg("\n[INFO] %s : enters for <%s> at cycle %d\n",
[204]	603	__FUNCTION__ , path , (uint32_t)hal_time_stamp() );
[101]	604
[23]	605	// compute lookup working mode
	606	lookup_mode = VFS_LOOKUP_OPEN;
	607	if( (flags & O_DIR ) ) lookup_mode \|= VFS_LOOKUP_DIR;
	608	if( (flags & O_CREAT ) ) lookup_mode \|= VFS_LOOKUP_CREATE;
	609	if( (flags & O_EXCL ) ) lookup_mode \|= VFS_LOOKUP_EXCL;
	610
	611	// compute attributes for the created file
	612	file_attr = 0;
	613	if( (flags & O_RDONLY ) == 0 ) file_attr \|= FD_ATTR_READ_ENABLE;
	614	if( (flags & O_WRONLY ) == 0 ) file_attr \|= FD_ATTR_WRITE_ENABLE;
	615	if( (flags & O_SYNC ) ) file_attr \|= FD_ATTR_SYNC;
	616	if( (flags & O_APPEND ) ) file_attr \|= FD_ATTR_APPEND;
	617	if( (flags & O_CLOEXEC) ) file_attr \|= FD_ATTR_CLOSE_EXEC;
[1]	618
[23]	619	// get extended pointer on target inode
	620	error = vfs_lookup( cwd_xp , path , lookup_mode , &inode_xp );
	621
[101]	622	vfs_dmsg("\n[INFO] %s : get inode_xp = %l for <%s> at cycle %d\n",
	623	__FUNCTION__ , inode_xp , path , hal_get_cycles() );
	624
[23]	625	if( error ) return error;
	626
	627	// get target inode cluster and local pointer
	628	inode_cxy = GET_CXY( inode_xp );
	629	inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	630
	631	// create a new file descriptor in cluster containing inode
	632	if( inode_cxy == local_cxy ) // target cluster is local
[1]	633	{
[23]	634	error = vfs_file_create( inode_ptr , file_attr , &file_xp );
[1]	635	}
[23]	636	else // target cluster is remote
	637	{
	638	rpc_vfs_file_create_client( inode_cxy , inode_ptr , file_attr , &file_xp , &error );
	639	}
[1]	640
[23]	641	if( error ) return error;
[1]	642
[23]	643	// allocate and register a new file descriptor index in reference cluster fd_array
	644	error = process_fd_register( file_xp , &file_id );
[1]	645
[23]	646	if( error ) return error;
[1]	647
[265]	648	vfs_dmsg("\n[INFO] %s : exit for <%s> / file_id = %d / file_xp = %l / at cycle %d\n",
[238]	649	__FUNCTION__ , path , file_id , file_xp , hal_get_cycles() );
	650
[23]	651	// success
	652	*new_file_xp = file_xp;
	653	*new_file_id = file_id;
	654	return 0;
[1]	655
[23]	656	} // end vfs_open()
	657
	658	/////////////////////////////////////
	659	error_t vfs_move( bool_t to_buffer,
[265]	660	bool_t is_user,
[23]	661	xptr_t file_xp,
	662	void * buffer,
	663	uint32_t size )
	664	{
	665	assert( ( file_xp != XPTR_NULL ) , __FUNCTION__ , "file_xp == XPTR_NULL" );
	666
	667	cxy_t file_cxy; // remote file descriptor cluster
	668	vfs_file_t * file_ptr; // remote file descriptor local pointer
	669	vfs_inode_type_t inode_type;
	670	uint32_t file_offset; // current offset in file
	671	mapper_t * mapper;
	672	error_t error;
	673
	674	// get cluster and local pointer on remote file descriptor
	675	file_cxy = GET_CXY( file_xp );
	676	file_ptr = (vfs_file_t *)GET_PTR( file_xp );
	677
	678	// get inode type from remote file descriptor
	679	inode_type = hal_remote_lw( XPTR( file_cxy , &file_ptr->type ) );
	680
	681	// action depends on inode type
	682	if( inode_type == INODE_TYPE_FILE )
	683	{
	684	// get mapper pointer and file offset from file descriptor
	685	file_offset = hal_remote_lw( XPTR( file_cxy , &file_ptr->offset ) );
	686	mapper = (mapper_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->mapper ) );
	687
	688	// move data between mapper and buffer
	689	if( file_cxy == local_cxy )
	690	{
[265]	691	error = mapper_move_buffer( mapper,
	692	to_buffer,
	693	is_user,
	694	file_offset,
	695	buffer,
	696	size );
[23]	697	}
	698	else
	699	{
[265]	700	rpc_mapper_move_buffer_client( file_cxy,
	701	mapper,
	702	to_buffer,
	703	is_user,
	704	file_offset,
	705	buffer,
	706	size,
	707	&error );
[23]	708	}
	709
[265]	710	if( error ) return -1;
	711	else return size;
[23]	712	}
[265]	713	else
[23]	714	{
[265]	715	printk("\n[ERROR] in %s : inode is not a file", __FUNCTION__ );
[23]	716	return -1;
	717	}
[204]	718	} // end vfs_move()
[23]	719
	720	//////////////////////////////////////
	721	error_t vfs_lseek( xptr_t file_xp,
	722	uint32_t offset,
	723	uint32_t whence,
	724	uint32_t * new_offset )
	725	{
[266]	726	xptr_t offset_xp;
	727	xptr_t lock_xp;
	728	cxy_t file_cxy;
	729	vfs_file_t * file_ptr;
	730	vfs_inode_t * inode_ptr;
	731	uint32_t new;
	732
	733	assert( (file_xp != XPTR_NULL) , __FUNCTION__ , "file_xp == XPTR_NULL" );
	734
	735	// get cluster and local pointer on remote file descriptor
	736	file_cxy = GET_CXY( file_xp );
	737	file_ptr = (vfs_file_t *)GET_PTR( file_xp );
	738
	739	// build extended pointers on lock and offset
	740	offset_xp = XPTR( file_cxy , &file_ptr->offset );
	741	lock_xp = XPTR( file_cxy , &file_ptr->lock );
	742
	743	// take file descriptor lock
	744	remote_rwlock_wr_lock( lock_xp );
	745
	746	if ( whence == SEEK_CUR ) // new = current + offset
	747	{
	748	new = hal_remote_lw( offset_xp ) + offset;
	749	}
	750	else if ( whence == SEEK_SET ) // new = offset
	751	{
	752	new = offset;
	753	}
	754	else if ( whence == SEEK_END ) // new = size + offset
	755	{
	756	// get local pointer on remote inode
	757	inode_ptr = (vfs_inode_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
	758
	759	new = hal_remote_lw( XPTR( file_cxy , &inode_ptr->size ) ) + offset;
	760	}
	761	else
	762	{
	763	printk("\n[ERROR] in %s : illegal whence value\n", __FUNCTION__ );
	764	remote_rwlock_wr_unlock( lock_xp );
	765	return -1;
	766	}
	767
	768	// set new offset
	769	hal_remote_sw( offset_xp , new );
	770
	771	// release file descriptor lock
	772	remote_rwlock_wr_unlock( lock_xp );
	773
	774	// success
[271]	775	if ( new_offset != NULL )
	776	*new_offset = new;
[1]	777	return 0;
	778
[23]	779	} // vfs_lseek()
	780
	781	///////////////////////////////////
	782	error_t vfs_close( xptr_t file_xp,
	783	uint32_t file_id )
[1]	784	{
[23]	785	assert( (file_xp != XPTR_NULL) , __FUNCTION__ , "file_xp == XPTR_NULL" );
	786
	787	assert( (file_id < CONFIG_PROCESS_FILE_MAX_NR) , __FUNCTION__ , "illegal file_id" );
	788
	789	thread_t * this = CURRENT_THREAD;
	790	process_t * process = this->process;
	791
	792	// get cluster and local pointer on remote file descriptor
[1]	793	cxy_t file_cxy = GET_CXY( file_xp );
	794	vfs_file_t * file_ptr = (vfs_file_t *)GET_PTR( file_xp );
	795
[23]	796	// get local pointer on local cluster manager
	797	cluster_t * cluster = LOCAL_CLUSTER;
	798
	799	// get owner process cluster and lpid
	800	cxy_t owner_cxy = CXY_FROM_PID( process->pid );
	801	lpid_t lpid = LPID_FROM_PID( process->pid );
	802
	803	// get extended pointers on copies root and lock
	804	xptr_t root_xp = XPTR( owner_cxy , &cluster->pmgr.copies_root[lpid] );
	805	xptr_t lock_xp = XPTR( owner_cxy , &cluster->pmgr.copies_lock[lpid] );
	806
	807	// take the lock protecting the copies
	808	remote_spinlock_lock( lock_xp );
	809
	810	// 1) loop on the process descriptor copies to cancel all fd_array[file_id] entries
	811	xptr_t iter_xp;
	812	XLIST_FOREACH( root_xp , iter_xp )
[1]	813	{
[23]	814	xptr_t process_xp = XLIST_ELEMENT( iter_xp , process_t , copies_list );
	815	cxy_t process_cxy = GET_CXY( process_xp );
	816	process_t * process_ptr = (process_t *)GET_PTR( process_xp );
[1]	817
[23]	818	xptr_t lock_xp = XPTR( process_cxy , &process_ptr->fd_array.lock );
	819	xptr_t entry_xp = XPTR( process_cxy , &process_ptr->fd_array.array[file_id] );
	820
	821	// lock is required for atomic write of a 64 bits word
	822	remote_rwlock_wr_lock( lock_xp );
	823	hal_remote_swd( entry_xp , XPTR_NULL );
	824	remote_rwlock_wr_unlock( lock_xp );
	825
[124]	826	hal_fence();
[23]	827	}
	828
	829	// 2) release memory allocated to file descriptor in remote cluster
	830	if( file_cxy == local_cxy ) // file cluster is local
[1]	831	{
[23]	832	vfs_file_destroy( file_ptr );
	833	}
	834	else // file cluster is local
	835	{
	836	rpc_vfs_file_destroy_client( file_cxy , file_ptr );
	837	}
[1]	838
[23]	839	return 0;
[1]	840
[23]	841	} // end vfs_close()
[1]	842
	843	////////////////////////////////////
[23]	844	error_t vfs_unlink( xptr_t cwd_xp,
	845	char * path )
[1]	846	{
[23]	847	printk("\n[PANIC] %s non implemented\n", __FUNCTION__ );
	848	hal_core_sleep();
[1]	849	return 0;
[23]	850	} // vfs_unlink()
[1]	851
[23]	852	///////////////////////////////////////
	853	error_t vfs_stat( xptr_t file_xp,
	854	vfs_stat_t * k_stat )
[1]	855	{
[23]	856	printk("\n[PANIC] %s non implemented\n", __FUNCTION__ );
	857	hal_core_sleep();
[1]	858	return 0;
	859	}
	860
[23]	861	////////////////////////////////////////////
	862	error_t vfs_readdir( xptr_t file_xp,
	863	vfs_dirent_t * k_dirent )
[1]	864	{
[23]	865	printk("\n[PANIC] %s non implemented\n", __FUNCTION__ );
	866	hal_core_sleep();
[1]	867	return 0;
	868	}
	869
	870	//////////////////////////////////////
[23]	871	error_t vfs_mkdir( xptr_t file_xp,
	872	char * path,
	873	uint32_t mode )
[1]	874	{
[23]	875	printk("\n[PANIC] %s non implemented\n", __FUNCTION__ );
	876	hal_core_sleep();
[1]	877	return 0;
	878	}
	879
[23]	880	////////////////////////////////////
	881	error_t vfs_rmdir( xptr_t file_xp,
	882	char * path )
[1]	883	{
[23]	884	printk("\n[PANIC] %s non implemented\n", __FUNCTION__ );
	885	hal_core_sleep();
[1]	886	return 0;
	887	}
	888
[23]	889	///////////////////////////////////
	890	error_t vfs_chdir( xptr_t cwd_xp,
	891	char * path )
[1]	892	{
[23]	893	error_t error;
	894	xptr_t inode_xp; // extended pointer on target inode
	895	cxy_t inode_cxy; // target inode cluster identifier
	896	vfs_inode_t * inode_ptr; // target inode local pointer
	897	uint32_t mode; // lookup working mode
	898	vfs_inode_type_t inode_type; // target inode type
	899
	900	// set lookup working mode
	901	mode = 0;
	902
	903	// get extended pointer on target inode
	904	error = vfs_lookup( cwd_xp , path , mode , &inode_xp );
	905
	906	if( error ) return error;
	907
	908	// get inode cluster and local pointer
	909	inode_cxy = GET_CXY( inode_xp );
	910	inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	911
	912	// get inode type from remote file
	913	inode_type = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->type ) );
	914
	915	if( inode_type != INODE_TYPE_DIR )
	916	{
	917	CURRENT_THREAD->errno = ENOTDIR;
	918	return -1;
	919	}
	920
	921	printk("\n[PANIC] %s non fully implemented\n", __FUNCTION__ );
	922	hal_core_sleep();
[1]	923	return 0;
	924	}
	925
[23]	926	///////////////////////////////////
	927	error_t vfs_chmod( xptr_t cwd_xp,
	928	char * path,
	929	uint32_t rights )
[1]	930	{
[23]	931	error_t error;
	932	xptr_t inode_xp; // extended pointer on target inode
	933	cxy_t inode_cxy; // inode cluster identifier
	934	vfs_inode_t * inode_ptr; // inode local pointer
	935	uint32_t mode; // lookup working mode
	936	vfs_inode_type_t inode_type; // target inode type
	937
	938	// set lookup working mode
	939	mode = 0;
	940
	941	// get extended pointer on target inode
	942	error = vfs_lookup( cwd_xp , path , mode , &inode_xp );
	943
	944	if( error ) return error;
	945
	946	// get inode cluster and local pointer
	947	inode_cxy = GET_CXY( inode_xp );
	948	inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	949
	950	// get inode type from remote inode
	951	inode_type = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->type ) );
	952
	953
	954	printk("\n[PANIC] %s non fully implemented\n", __FUNCTION__ );
	955	hal_core_sleep();
[1]	956	return 0;
	957	}
	958
[23]	959	///////////////////////////////////
	960	error_t vfs_mkfifo( xptr_t cwd_xp,
	961	char * path,
	962	uint32_t rights )
	963	{
	964	printk("\n[PANIC] in %s : not implemented yet\n", __FUNCTION__ );
	965	hal_core_sleep();
	966	return 0;
	967	}
[1]	968
	969
	970
[188]	971	//////////////////////////////////////////////////////////////////////////////////////////
[1]	972	// Inode Tree functions
	973	//////////////////////////////////////////////////////////////////////////////////////////
	974
[188]	975	/////////////////////////////////
	976	cxy_t vfs_cluster_random_select()
	977	{
	978	uint32_t x_size = LOCAL_CLUSTER->x_size;
	979	uint32_t y_size = LOCAL_CLUSTER->y_size;
	980	uint32_t y_width = LOCAL_CLUSTER->y_width;
	981	uint32_t index = ( hal_get_cycles() + hal_get_gid() ) % (x_size * y_size);
	982	uint32_t x = index / y_size;
	983	uint32_t y = index % y_size;
	984
	985	return (x<<y_width) + y;
	986	}
	987
	988
	989	//////////////////////////////////////////////////////////////////////////
	990	// This static function is called by the vfs_display() function.
	991	//////////////////////////////////////////////////////////////////////////
	992	static void vfs_recursive_display( xptr_t inode_xp,
	993	xptr_t name_xp,
[204]	994	xptr_t dentry_xp,
[188]	995	uint32_t indent )
	996	{
	997	cxy_t inode_cxy;
	998	vfs_inode_t * inode_ptr;
	999	vfs_inode_type_t inode_type;
[204]	1000	xptr_t children_xp; // extended pointer on children xhtab
[188]	1001
[204]	1002	xptr_t child_dentry_xp;
	1003	cxy_t child_dentry_cxy;
	1004	vfs_dentry_t * child_dentry_ptr;
	1005	xptr_t child_inode_xp;
	1006	xptr_t child_dentry_name_xp;
[188]	1007
	1008	char name[CONFIG_VFS_MAX_NAME_LENGTH];
	1009
	1010	char * indent_str[] = { "", // level 0
	1011	" ", // level 1
	1012	" ", // level 2
	1013	" ", // level 3
	1014	" ", // level 4
	1015	" ", // level 5
	1016	" ", // level 6
	1017	" ", // level 7
	1018	" ", // level 8
	1019	" ", // level 9
	1020	" ", // level 10
	1021	" ", // level 11
	1022	" ", // level 12
	1023	" ", // level 13
	1024	" ", // level 14
	1025	" " }; // level 15
	1026
	1027	assert( (inode_xp != XPTR_NULL) , __FUNCTION__ , "inode_xp cannot be NULL\n" );
	1028	assert( (name_xp != XPTR_NULL) , __FUNCTION__ , "name_xp cannot be NULL\n" );
	1029	assert( (indent < 16) , __FUNCTION__ , "depth cannot be larger than 15\n" );
	1030
	1031	// get inode cluster and local pointer
	1032	inode_cxy = GET_CXY( inode_xp );
	1033	inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	1034
	1035	// get inode type
	1036	inode_type = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->type ) );
	1037
	1038	// make a local copy of node name
	1039	hal_remote_strcpy( XPTR( local_cxy , name ) , name_xp );
	1040
	1041	// display inode
[204]	1042	printk("%s%s <%s> inode_xp = %l / dentry_xp = %l\n",
	1043	indent_str[indent], vfs_inode_type_str( inode_type ),
	1044	name , inode_xp , dentry_xp );
[188]	1045
	1046	// scan directory entries
	1047	if( inode_type == INODE_TYPE_DIR )
	1048	{
	1049	// get extended pointer on directory entries xhtab
[204]	1050	children_xp = XPTR( inode_cxy , &inode_ptr->children );
[188]	1051
	1052	// get xhtab lock
[204]	1053	xhtab_read_lock( children_xp );
[188]	1054
	1055	// get first dentry from xhtab
[204]	1056	child_dentry_xp = xhtab_get_first( children_xp );
[188]	1057
[204]	1058	while( child_dentry_xp != XPTR_NULL )
[188]	1059	{
	1060	// get dentry cluster and local pointer
[204]	1061	child_dentry_cxy = GET_CXY( child_dentry_xp );
	1062	child_dentry_ptr = (vfs_dentry_t *)GET_PTR( child_dentry_xp );
[188]	1063
	1064	// get extended pointer on child inode
[204]	1065	child_inode_xp = hal_remote_lwd( XPTR( child_dentry_cxy,
	1066	&child_dentry_ptr->child_xp ) );
[188]	1067
	1068	// get extended pointer on dentry name
[204]	1069	child_dentry_name_xp = XPTR( child_dentry_cxy , &child_dentry_ptr->name );
[188]	1070
	1071	// recursive call on child inode
[204]	1072	vfs_recursive_display( child_inode_xp,
	1073	child_dentry_name_xp,
	1074	child_dentry_xp,
	1075	indent+1 );
[188]	1076
	1077	// get next dentry
[204]	1078	child_dentry_xp = xhtab_get_next( children_xp );
[188]	1079	}
	1080
	1081	// release xhtab lock
[204]	1082	xhtab_read_unlock( children_xp );
[188]	1083	}
	1084	} // end vfs_recursive_display()
	1085
	1086	///////////////////////////////////
	1087	void vfs_display( xptr_t inode_xp )
	1088	{
[204]	1089	xptr_t name_xp;
[188]	1090	xptr_t dentry_xp;
	1091	cxy_t dentry_cxy;
	1092	vfs_dentry_t * dentry_ptr;
	1093
	1094	// get target inode cluster and local pointer
	1095	cxy_t inode_cxy = GET_CXY( inode_xp );
	1096	vfs_inode_t * inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	1097
	1098	// get extended pointer on associated dentry
	1099	dentry_xp = hal_remote_lwd( XPTR( inode_cxy , &inode_ptr->parent_xp ) );
	1100
	1101	// check if target inode is the File System root
	1102	if( dentry_xp == XPTR_NULL )
	1103	{
	1104	// build extended pointer on root name
	1105	name_xp = XPTR( local_cxy , "/" );
	1106	}
	1107	else
	1108	{
	1109	// get dentry cluster and local pointer
	1110	dentry_cxy = GET_CXY( dentry_xp );
	1111	dentry_ptr = (vfs_dentry_t *)GET_PTR( dentry_xp );
	1112
	1113	// get extended pointer on dentry name
	1114	name_xp = XPTR( dentry_cxy , &dentry_ptr->name );
	1115	}
	1116
	1117	// print header
[204]	1118	printk("\n* VFS *\n");
[188]	1119
	1120	// call recursive function
[204]	1121	vfs_recursive_display( inode_xp , name_xp , dentry_xp , 0 );
[188]	1122
[204]	1123	} // end vfs_display()
[188]	1124
[1]	1125	//////////////////////////////////////////////////////////////////////////////////////////
[23]	1126	// This function is used by the vfs_lookup() function.
[1]	1127	// It takes an extended pointer on a remote inode (parent directory inode),
	1128	// and check access_rights violation for the calling thread.
	1129	// It can be used by any thread running in any cluster.
	1130	//////////////////////////////////////////////////////////////////////////////////////////
	1131	// @ inode_xp : extended pointer on inode.
	1132	// @ client_uid : client thread user ID
	1133	// @ client_gid : client thread group ID
	1134	// @ return true if access rights are violated.
	1135	//////////////////////////////////////////////////////////////////////////////////////////
	1136	bool_t vfs_access_denied( xptr_t inode_xp,
	1137	uint32_t client_uid,
	1138	uint32_t client_gid )
	1139	{
	1140	// get found inode cluster and local pointer
	1141	cxy_t inode_cxy = GET_CXY( inode_xp );
	1142	vfs_inode_t * inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	1143
	1144	// get inode access mode, UID, and GID
	1145	// TODO uint32_t mode = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->mode ) );
	1146	uid_t uid = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->uid ) );
	1147	gid_t gid = hal_remote_lw( XPTR( inode_cxy , &inode_ptr->gid ) );
	1148
	1149	// FIXME : me must use mode
	1150	if( (uid == client_uid) \|\| (gid == client_gid) ) return false;
	1151	else return true;
	1152	}
	1153
	1154	//////////////////////////////////////////////////////////////////////////////////////////
	1155	// This static function is used by the vfs_lookup() function.
[204]	1156	// It takes an extended pointer on a remote parent directory inode, a directory
[1]	1157	// entry name, and returns an extended pointer on the child inode.
	1158	// It can be used by any thread running in any cluster.
	1159	//////////////////////////////////////////////////////////////////////////////////////////
	1160	// @ parent_xp : extended pointer on parent inode in remote cluster.
	1161	// @ name : dentry name
	1162	// @ child_xp : [out] buffer for extended pointer on child inode.
	1163	// @ return true if success / return false if not found.
	1164	//////////////////////////////////////////////////////////////////////////////////////////
	1165	static bool_t vfs_get_child( xptr_t parent_xp,
	1166	char * name,
	1167	xptr_t * child_xp )
	1168	{
	1169	xptr_t xhtab_xp; // extended pointer on hash table containing children dentries
	1170	xptr_t dentry_xp; // extended pointer on children dentry
	1171
	1172	// get parent inode cluster and local pointer
	1173	cxy_t parent_cxy = GET_CXY( parent_xp );
	1174	vfs_inode_t * parent_ptr = (vfs_inode_t *)GET_PTR( parent_xp );
	1175
	1176	// get extended pointer on hash table of children directory entries
	1177	xhtab_xp = XPTR( parent_cxy , &parent_ptr->children );
	1178
	1179	// search extended pointer on matching dentry
	1180	dentry_xp = xhtab_lookup( xhtab_xp , name );
	1181
	1182	if( dentry_xp == XPTR_NULL ) return false;
	1183
	1184	// get dentry cluster and local pointer
	1185	cxy_t dentry_cxy = GET_CXY( dentry_xp );
	1186	vfs_dentry_t * dentry_ptr = (vfs_dentry_t *)GET_PTR( dentry_xp );
	1187
	1188	// return child inode
[101]	1189	*child_xp = (xptr_t)hal_remote_lwd( XPTR( dentry_cxy , &dentry_ptr->child_xp ) );
[1]	1190	return true;
	1191
[204]	1192	} // end vfs_get_child()
	1193
[1]	1194	//////////////////////////////////////////////////////////////////////////////////////////
	1195	// This static function is used by the vfs_lookup() function.
	1196	// It takes the <current> pointer on a buffer containing a complete pathname, and return
	1197	// in the <name> buffer, allocated by the caller, a single name in the path.
	1198	// It return also in the <next> pointer the next character to analyse in the path.
	1199	// Finally it returns a <last> boolean, that is true when the returned <name> is the
	1200	// last name in the path. The names are supposed to be separated by one or several '/'
	1201	// characters, that are not written in the <name> buffer.
	1202	//////////////////////////////////////////////////////////////////////////////////////////
	1203	// @ current : pointer on first character to analyse in buffer containing the path.
	1204	// @ name : [out] pointer on buffer allocated by the caller for the returned name.
	1205	// @ next : [out] pointer on next character to analyse in buffer containing the path.
	1206	// @ last : [out] true if the returned name is the last (NUL character found).
	1207	// @ return 0 if success / return EINVAL if string empty (first chracter is NUL).
	1208	//////////////////////////////////////////////////////////////////////////////////////////
	1209	static error_t vfs_get_name_from_path( char * current,
	1210	char * name,
	1211	char ** next,
	1212	bool_t * last )
	1213	{
	1214	char * ptr = current;
	1215
	1216	// skip leading '/' characters
	1217	while( *ptr == '/' ) ptr++;
	1218
	1219	// return EINVAL if string empty
	1220	if( *ptr == 0 ) return EINVAL;
	1221
	1222	// copy all characters in name until NUL or '/'
	1223	while( (ptr != 0) && (ptr !='/') ) (name++) = (ptr++);
	1224
[204]	1225	// set NUL terminating character in name buffer
	1226	*(name++) = 0;
	1227
[1]	1228	// return last an next
	1229	if( *ptr == 0 ) // last found character is NUL => last name in path
	1230	{
	1231	*last = true;
	1232	}
	1233	else // last found character is '/' => skip it
	1234	{
	1235	*last = false;
	1236	*next = ptr + 1;
	1237	}
	1238
	1239	return 0;
[204]	1240
	1241	} // end vfs_get name_from_path()
[188]	1242
[23]	1243	//////////////////////////////////////////////
	1244	error_t vfs_lookup( xptr_t cwd_xp,
	1245	char * pathname,
	1246	uint32_t mode,
	1247	xptr_t * inode_xp )
[1]	1248	{
[101]	1249	char name[CONFIG_VFS_MAX_NAME_LENGTH]; // one name in path
[1]	1250
[23]	1251	xptr_t parent_xp; // extended pointer on parent inode
	1252	cxy_t parent_cxy; // cluster for parent inode
	1253	vfs_inode_t * parent_ptr; // local pointer on parent inode
	1254	xptr_t child_xp; // extended pointer on child inode
	1255	cxy_t child_cxy; // cluster for child inode
	1256	vfs_inode_t * child_ptr; // local pointer on child inode
[238]	1257	vfs_inode_type_t child_type; // child inode type
[23]	1258	vfs_fs_type_t fs_type; // File system type
	1259	vfs_ctx_t * ctx_ptr; // local pointer on FS context
	1260	char * current; // current pointer on path
	1261	char * next; // next value for current pointer
	1262	bool_t last; // true when the name is the last in path
	1263	bool_t found; // true when a child has been found
	1264	thread_t * this; // pointer on calling thread descriptor
	1265	process_t * process; // pointer on calling process descriptor
	1266	error_t error;
[1]	1267
[204]	1268	vfs_dmsg("\n[INFO] %s : enters for <%s> at cycle %d\n",
	1269	__FUNCTION__ , pathname , (uint32_t)hal_time_stamp() );
[101]	1270
[1]	1271	this = CURRENT_THREAD;
	1272	process = this->process;
	1273
	1274	// get extended pointer on first inode to search
	1275	if( pathname[0] == '/' ) parent_xp = process->vfs_root_xp;
	1276	else parent_xp = cwd_xp;
	1277
[101]	1278	// initialise other loop variables
[1]	1279	current = pathname;
	1280	next = NULL;
	1281	last = false;
	1282	child_xp = XPTR_NULL;
	1283
	1284	// take lock on parent inode
[101]	1285	vfs_inode_lock( parent_xp );
[1]	1286
[101]	1287	// load from device if one intermediate node not found
[204]	1288	// exit while loop when last name found (i.e. last == true)
[1]	1289	do
	1290	{
[101]	1291	// get one name from path, and the "last" flag
[1]	1292	vfs_get_name_from_path( current , name , &next , &last );
	1293
[204]	1294	vfs_dmsg("\n[INFO] %s : looking for <%s> / last = %d\n",
[101]	1295	__FUNCTION__ , name , last );
	1296
[204]	1297	// search a child dentry matching name in parent inode
[1]	1298	found = vfs_get_child( parent_xp,
	1299	name,
	1300	&child_xp );
	1301
[238]	1302	// if a child inode is not found in the inode tree:
	1303	// - we create the missing inode/dentry couple in the inode tree,
	1304	// - we scan the parent mapper to complete the child inode (type and extension),
	1305	// - we return an error if child not found on device.
	1306	// - if the missing child is a directory, we load the child mapper from device
	1307
	1308	// for the last name, the behaviour depends on the "mode" argument:
	1309
[246]	1310	if (found == false ) // child node not found in inode tree
[1]	1311	{
[204]	1312	vfs_dmsg("\n[INFO] %s : <%s> not found, try to load it\n",
[101]	1313	__FUNCTION__ , name );
	1314
[1]	1315	// release lock on parent inode
[101]	1316	vfs_inode_unlock( parent_xp );
[1]	1317
[238]	1318	// get parent inode FS type
[23]	1319	parent_cxy = GET_CXY( parent_xp );
	1320	parent_ptr = (vfs_inode_t *)GET_PTR( parent_xp );
[1]	1321
[238]	1322	ctx_ptr = (vfs_ctx_t *)hal_remote_lpt( XPTR( parent_cxy ,
	1323	&parent_ptr->ctx ) );
	1324	fs_type = hal_remote_lw( XPTR( parent_cxy , &ctx_ptr->type ) );
[23]	1325
[238]	1326	// select a cluster for missing inode
	1327	child_cxy = vfs_cluster_random_select();
[188]	1328
	1329	// insert a new child dentry/inode in parent inode
	1330	error = vfs_add_child_in_parent( child_cxy,
[238]	1331	INODE_TYPE_DIR,
[23]	1332	fs_type,
	1333	parent_xp,
[222]	1334	name,
[238]	1335	NULL, // fs_type_specific inode extend
[23]	1336	&child_xp );
[1]	1337	if( error )
	1338	{
[238]	1339	printk("\n[ERROR] in %s : no memory for inode %s in path %s\n",
	1340	__FUNCTION__ , name , pathname );
	1341	return ENOMEM;
	1342	}
	1343
	1344	// scan parent mapper to complete the missing inode
	1345	if( parent_cxy == local_cxy )
	1346	{
	1347	error = vfs_inode_load( parent_ptr,
	1348	name,
	1349	child_xp );
	1350	}
	1351	else
	1352	{
	1353	rpc_vfs_inode_load_client( parent_cxy,
	1354	parent_ptr,
	1355	name,
	1356	child_xp,
	1357	&error );
	1358	}
	1359
	1360	if ( error )
	1361	{
[188]	1362	printk("\n[ERROR] in %s : node %s not found in path %s\n",
[1]	1363	__FUNCTION__ , name , pathname );
	1364	return ENOENT;
	1365	}
	1366
[238]	1367	// get child inode type
	1368	child_ptr = (vfs_inode_t *)GET_PTR( child_xp );
	1369	child_type = hal_remote_lw( XPTR( child_cxy , &child_ptr->type ) );
	1370
	1371	// load child mapper from device if it is a directory
	1372	if( child_type == INODE_TYPE_DIR )
	1373	{
	1374	if( child_cxy == local_cxy )
	1375	{
	1376	error = vfs_mapper_load_all( child_ptr );
	1377	}
	1378	else
	1379	{
	1380	rpc_vfs_mapper_load_all_client( child_cxy,
	1381	child_ptr,
	1382	&error );
	1383	}
	1384
	1385	if ( error )
	1386	{
	1387	printk("\n[ERROR] in %s : cannot access device for node %s in path %s\n",
	1388	__FUNCTION__ , name , pathname );
	1389	return EIO;
	1390	}
	1391	}
	1392
	1393	// TODO handle lookup mode here [AG]
	1394
[1]	1395	// take lock on parent inode
[101]	1396	vfs_inode_lock( parent_xp );
[1]	1397	}
	1398
[204]	1399	vfs_dmsg("\n[INFO] %s : found <%s> / parent = %l / child = %l / last = %d\n",
[238]	1400	__FUNCTION__ , name , parent_xp , child_xp , last );
[101]	1401
	1402	// TODO check access rights
[23]	1403	// error = vfs_access_denied( child_xp,
	1404	// client_uid,
	1405	// client_gid );
	1406	// if( error )
	1407	// {
	1408	// printk("\n[ERROR] in %s : permission denied for %s\n", __FUNCTION__ , name );
	1409	// return EACCES;
	1410	// }
[1]	1411
[238]	1412	// take lock on child inode and release lock on parent
	1413	vfs_inode_lock( child_xp );
[101]	1414	vfs_inode_unlock( parent_xp );
[1]	1415
	1416	// update loop variables
	1417	parent_xp = child_xp;
	1418	current = next;
	1419	}
	1420	while( last == false );
	1421
[238]	1422	// release lock
	1423	vfs_inode_unlock( parent_xp );
[1]	1424
[265]	1425	vfs_dmsg("\n[INFO] in %s : exit <%s> found / inode = %l\n",
[238]	1426	__FUNCTION__ , pathname , child_xp );
[1]	1427
[238]	1428	// return searched pointer
[1]	1429	*inode_xp = child_xp;
	1430
	1431	return 0;
	1432
	1433	} // end vfs_lookup()
	1434
	1435	////////////////////////////////////////////
	1436	error_t vfs_get_path( xptr_t searched_xp,
	1437	char * buffer,
	1438	uint32_t max_size )
	1439	{
	1440	xptr_t dentry_xp; // extended pointer on current dentry
	1441	char * name; // local pointer on current dentry name
	1442	uint32_t length; // length of current dentry name
	1443	uint32_t count; // number of characters written in buffer
	1444	uint32_t index; // slot index in buffer
[23]	1445	xptr_t inode_xp; // extended pointer on
[1]	1446
	1447	// implementation note:
	1448	// we use two variables "index" and "count" because the buffer
	1449	// is actually written in decreasing index order (from leaf to root)
	1450	// TODO : handle conflict with a concurrent rename
	1451	// FIXME : handle synchro in the loop ... [AG]
	1452
	1453	// set the NUL character in buffer / initialise buffer index and count
	1454	buffer[max_size - 1] = 0;
	1455	count = 1;
	1456	index = max_size - 2;
	1457
	1458	// initialize current inode
	1459	inode_xp = searched_xp;
	1460
	1461	// exit when root inode found (i.e. dentry_xp == XPTR_NULL)
	1462	do
	1463	{
	1464	// get inode cluster and local pointer
	1465	cxy_t inode_cxy = GET_CXY( inode_xp );
	1466	vfs_inode_t * inode_ptr = (vfs_inode_t *)GET_PTR( inode_xp );
	1467
	1468	// get extended pointer on parent dentry
	1469	dentry_xp = (xptr_t)hal_remote_lwd( XPTR( inode_cxy , inode_ptr->parent_xp ) );
	1470
	1471	// get dentry cluster and local pointer
	1472	cxy_t dentry_cxy = GET_CXY( dentry_xp );
	1473	vfs_dentry_t * dentry_ptr = (vfs_dentry_t *)GET_PTR( dentry_xp );
	1474
	1475	// get dentry name length and pointer
	1476	length = hal_remote_lw( XPTR( dentry_cxy , &dentry_ptr->length ) );
	1477	name = (char *)hal_remote_lpt( XPTR( dentry_cxy , &dentry_ptr->name ) );
	1478
	1479	// update index and count
	1480	index -= (length + 1);
	1481	count += (length + 1);
	1482
	1483	// check buffer overflow
	1484	if( count >= max_size )
	1485	{
	1486	printk("\n[ERROR] in %s : kernel buffer too small\n", __FUNCTION__ );
	1487	return EINVAL;
	1488	}
	1489
	1490	// update pathname
	1491	hal_remote_memcpy( XPTR( local_cxy , &buffer[index + 1] ) ,
	1492	XPTR( dentry_cxy , name ) , length );
	1493	buffer[index] = '/';
	1494
	1495	// get extended pointer on next inode
	1496	inode_xp = (xptr_t)hal_remote_lwd( XPTR( dentry_cxy , dentry_ptr->parent ) );
	1497	}
	1498	while( (dentry_xp != XPTR_NULL) );
	1499
	1500	return 0;
	1501
	1502	} // end vfs_get_path()
	1503
[188]	1504
	1505	//////////////////////////////////////////////////////////////
	1506	error_t vfs_add_child_in_parent( cxy_t child_cxy,
	1507	vfs_inode_type_t inode_type,
[23]	1508	vfs_fs_type_t fs_type,
	1509	xptr_t parent_xp,
	1510	char * name,
[188]	1511	void * extend,
[23]	1512	xptr_t * child_xp )
[1]	1513	{
[23]	1514	error_t error;
	1515	xptr_t dentry_xp; // extended pointer on created dentry
	1516	xptr_t inode_xp; // extended pointer on created inode
	1517	cxy_t parent_cxy; // parent inode cluster identifier
	1518	vfs_inode_t * parent_ptr; // parent inode local pointer
[1]	1519
	1520	// get parent inode cluster and local pointer
[23]	1521	parent_cxy = GET_CXY( parent_xp );
	1522	parent_ptr = (vfs_inode_t *)GET_PTR( parent_xp );
[1]	1523
[279]	1524	vfs_dmsg("\n[INFO] %s : enter in cluster %x / child_cxy = %x / parent_cxy = %x\n",
	1525	__FUNCTION__ , local_cxy , child_cxy , parent_cxy );
	1526
[204]	1527	// 1. create dentry
[1]	1528	if( parent_cxy == local_cxy ) // parent cluster is the local cluster
	1529	{
[23]	1530	error = vfs_dentry_create( fs_type,
[1]	1531	name,
	1532	parent_ptr,
	1533	&dentry_xp );
[279]	1534
	1535	vfs_dmsg("\n[INFO] %s : dentry created in local cluster %x\n",
	1536	__FUNCTION__ , local_cxy );
[1]	1537	}
	1538	else // parent cluster is remote
	1539	{
	1540	rpc_vfs_dentry_create_client( parent_cxy,
[23]	1541	fs_type,
[1]	1542	name,
	1543	parent_ptr,
	1544	&dentry_xp,
	1545	&error );
[279]	1546
	1547	vfs_dmsg("\n[INFO] %s : dentry created in remote cluster %x\n",
	1548	__FUNCTION__ , parent_cxy );
[1]	1549	}
	1550
	1551	if( error )
	1552	{
	1553	printk("\n[ERROR] in %s : cannot create dentry in cluster %x\n",
	1554	__FUNCTION__ , parent_cxy );
[204]	1555	return ENOMEM;
[1]	1556	}
	1557
[204]	1558	// 2. create child inode TODO : define attr / mode / uid / gid
[1]	1559	uint32_t attr = 0;
	1560	uint32_t mode = 0;
	1561	uint32_t uid = 0;
	1562	uint32_t gid = 0;
	1563
	1564	if( child_cxy == local_cxy ) // child cluster is the local cluster
	1565	{
	1566	error = vfs_inode_create( dentry_xp,
[23]	1567	fs_type,
	1568	inode_type,
[188]	1569	extend,
[1]	1570	attr,
	1571	mode,
	1572	uid,
	1573	gid,
	1574	&inode_xp );
[279]	1575
	1576	vfs_dmsg("\n[INFO] %s : inode created in local cluster %x\n",
	1577	__FUNCTION__ , local_cxy );
[1]	1578	}
	1579	else // child cluster is remote
	1580	{
	1581	rpc_vfs_inode_create_client( child_cxy,
	1582	dentry_xp,
[23]	1583	fs_type,
	1584	inode_type,
[188]	1585	extend,
[1]	1586	attr,
	1587	mode,
	1588	uid,
	1589	gid,
	1590	&inode_xp,
	1591	&error );
[279]	1592
	1593	vfs_dmsg("\n[INFO] %s : inodecreated in remote cluster %x\n",
	1594	__FUNCTION__ , child_cxy );
[1]	1595	}
	1596
	1597	if( error )
	1598	{
	1599	printk("\n[ERROR] in %s : cannot create inode in cluster %x\n",
	1600	__FUNCTION__ , child_cxy );
	1601
	1602	vfs_dentry_t * dentry = (vfs_dentry_t *)GET_PTR( dentry_xp );
	1603	if( parent_cxy == local_cxy ) vfs_dentry_destroy( dentry );
	1604	else rpc_vfs_dentry_destroy_client( parent_cxy , dentry );
[204]	1605	return ENOMEM;
[1]	1606	}
	1607
[204]	1608	// 3. update extended pointer on inode in dentry
	1609	cxy_t dentry_cxy = GET_CXY( dentry_xp );
	1610	vfs_dentry_t * dentry_ptr = (vfs_dentry_t *)GET_PTR( dentry_xp );
	1611	hal_remote_swd( XPTR( dentry_cxy , &dentry_ptr->child_xp ) , inode_xp );
	1612
[1]	1613	// success : return extended pointer on child inode
	1614	*child_xp = inode_xp;
	1615	return 0;
	1616
	1617	} // end vfs_add_child_in_parent()
	1618
[23]	1619	//////////////////////////////////////////////////////////////////////////////////////////
	1620	// Mapper related functions
	1621	//////////////////////////////////////////////////////////////////////////////////////////
	1622
[238]	1623	////////////////////////////////////////////
	1624	error_t vfs_mapper_move_page( page_t * page,
	1625	bool_t to_mapper )
[23]	1626	{
[204]	1627	error_t error = 0;
[23]	1628
	1629	assert( (page != NULL) , __FUNCTION__ , "page pointer is NULL\n" );
	1630
[246]	1631	mapper_t * mapper = page->mapper;
[23]	1632
[246]	1633
[23]	1634	assert( (mapper != NULL) , __FUNCTION__ , "no mapper for page\n" );
	1635
[246]	1636	vfs_dmsg("\n[INFO] %s : enters for page = %d in mapper = %x\n",
	1637	__FUNCTION__ , page->index , mapper );
	1638
[23]	1639	// get FS type
[246]	1640	vfs_fs_type_t fs_type = mapper->type;
[23]	1641
[238]	1642	// call relevant FS function
[23]	1643	if( fs_type == FS_TYPE_FATFS )
	1644	{
	1645	rwlock_wr_lock( &mapper->lock );
[246]	1646	error = fatfs_mapper_move_page( page , to_mapper );
[23]	1647	rwlock_wr_unlock( &mapper->lock );
	1648	}
	1649	else if( fs_type == FS_TYPE_RAMFS )
	1650	{
	1651	assert( false , __FUNCTION__ , "should not be called for RAMFS\n" );
	1652	}
	1653	else if( fs_type == FS_TYPE_DEVFS )
	1654	{
	1655	assert( false , __FUNCTION__ , "should not be called for DEVFS\n" );
	1656	}
	1657	else
	1658	{
	1659	assert( false , __FUNCTION__ , "undefined file system type\n" );
	1660	}
	1661
[246]	1662	vfs_dmsg("\n[INFO] %s : exit for page = %d in mapper = %x\n",
	1663	__FUNCTION__ , page->index , mapper );
	1664
[23]	1665	return error;
	1666
[238]	1667	} // end vfs_move_page()
[23]	1668
	1669	//////////////////////////////////////////////////
[238]	1670	error_t vfs_mapper_load_all( vfs_inode_t * inode )
[23]	1671	{
[265]	1672	assert( (inode != NULL) , __FUNCTION__ , "inode pointer is NULL\n" );
[23]	1673
[238]	1674	uint32_t index;
	1675	page_t * page;
[23]	1676
[238]	1677	mapper_t * mapper = inode->mapper;
	1678	uint32_t size = inode->size;
[23]	1679
[265]	1680	assert( (mapper != NULL) , __FUNCTION__ , "mapper pointer is NULL\n" );
[23]	1681
[238]	1682	uint32_t npages = size >> CONFIG_PPM_PAGE_SHIFT;
[265]	1683	if( (size & CONFIG_PPM_PAGE_MASK) \|\| (size == 0) ) npages++;
[238]	1684
[265]	1685	// loop on pages
[238]	1686	for( index = 0 ; index < npages ; index ++ )
[23]	1687	{
[238]	1688	// this function allocates the missing page in mapper,
	1689	// and call the vfs_mapper_move_page() to load the page from device
	1690	page = mapper_get_page( mapper , index );
[23]	1691
[238]	1692	if( page == NULL ) return EIO;
[23]	1693	}
	1694
[238]	1695	return 0;
[23]	1696
[238]	1697	} // end vfs_mapper_load_all()
[23]	1698

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