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source: trunk/kernel/fs/vfs.c @ 673

Last change on this file since 673 was 673, checked in by alain, 3 years ago
Introduce the DEBUG_VFS_ERROR in kernel_config to make error messges display conditional.
File size: 138.9 KB

Line
1	/*
2	* vfs.c - Virtual File System implementation.
3	*
4	* Author Mohamed Lamine Karaoui (2014,2015)
5	* Alain Greiner (2016,2017,2018,2019,2020)
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	#include <kernel_config.h>
26	#include <hal_kernel_types.h>
27	#include <hal_atomic.h>
28	#include <hal_special.h>
29	#include <printk.h>
30	#include <list.h>
31	#include <xlist.h>
32	#include <slist.h>
33	#include <xhtab.h>
34	#include <string.h>
35	#include <errno.h>
36	#include <kmem.h>
37	#include <mapper.h>
38	#include <thread.h>
39	#include <chdev.h>
40	#include <pipe.h>
41	#include <process.h>
42	#include <cluster.h>
43	#include <vfs.h>
44	#include <fatfs.h>
45	#include <ramfs.h>
46	#include <devfs.h>
47	#include <syscalls.h>
48
49	//////////////////////////////////////////////////////////////////////////////////////////
50	// Extern variables
51	//////////////////////////////////////////////////////////////////////////////////////////
52
53	extern vfs_ctx_t fs_context[FS_TYPES_NR]; // allocated in kernel_init.c
54	extern chdev_directory_t chdev_dir; // allocated in kernel_init.c
55	extern char * lock_type_str[]; // allocated in kernel_init.c
56
57	///////////////////////////////////////////////////////////////////////////////////////////
58	// VFS Context related functions
59	//////////////////////////////////////////////////////////////////////////////////////////
60
61	///////////////////////////////////////
62	void vfs_ctx_init( cxy_t cxy,
63	vfs_fs_type_t fs_type,
64	uint32_t total_clusters,
65	uint32_t cluster_size,
66	xptr_t vfs_root_xp,
67	void * extend )
68	{
69	// get pointer on relevant VFS context (same in all clusters)
70	vfs_ctx_t * vfs_ctx_ptr = &fs_context[fs_type];
71
72	// initialise VFS context fields
73	hal_remote_s32( XPTR( cxy , &vfs_ctx_ptr->type ) , fs_type );
74	hal_remote_s32( XPTR( cxy , &vfs_ctx_ptr->total_clusters ) , total_clusters );
75	hal_remote_s32( XPTR( cxy , &vfs_ctx_ptr->cluster_size ) , cluster_size );
76	hal_remote_s64( XPTR( cxy , &vfs_ctx_ptr->vfs_root_xp ) , vfs_root_xp );
77	hal_remote_spt( XPTR( cxy , &vfs_ctx_ptr->extend ) , extend );
78
79	// initialize VFS context lock
80	remote_busylock_init( XPTR( cxy , &vfs_ctx_ptr->lock ) , LOCK_VFS_CTX );
81
82	// initialize inum allocator
83	bitmap_remote_init( XPTR( cxy , &vfs_ctx_ptr->bitmap ),
84	BITMAP_SIZE(CONFIG_VFS_MAX_INODES) );
85
86	} // end vfs_ctx_init()
87
88	///////////////////////////////////////////////
89	error_t vfs_ctx_inum_alloc( xptr_t ctx_xp,
90	uint32_t * inum )
91	{
92	// get context cluster and local pointer
93	cxy_t ctx_cxy = GET_CXY( ctx_xp );
94	vfs_ctx_t * ctx_ptr = GET_PTR( ctx_xp );
95
96	// build extended pointer on lock protecting the inum allocator
97	xptr_t lock_xp = XPTR( ctx_cxy , &ctx_ptr->lock );
98
99	// build extended pointer on inum bitmap
100	xptr_t bitmap_xp = XPTR( ctx_cxy , &ctx_ptr->bitmap );
101
102	// get lock on inum allocator
103	remote_busylock_acquire( lock_xp );
104
105	// get lid from local inum allocator
106	uint32_t lid = bitmap_remote_ffc( bitmap_xp , CONFIG_VFS_MAX_INODES );
107
108	if( lid == 0xFFFFFFFF ) // no more free slot => error
109	{
110	// release lock
111	remote_busylock_release( lock_xp );
112
113	// return error
114	return -1;
115	}
116	else // found => return inum
117	{
118	// set slot allocated
119	bitmap_remote_set( bitmap_xp , lid );
120
121	// release lock
122	remote_busylock_release( lock_xp );
123
124	// return inum
125	*inum = (((uint32_t)local_cxy) << 16) \| (lid & 0xFFFF);
126	return 0;
127	}
128	} // end vfs_ctx_inum_alloc()
129
130	/////////////////////////////////////////////
131	void vfs_ctx_inum_release( xptr_t ctx_xp,
132	uint32_t inum )
133	{
134	// get context cluster and local pointer
135	cxy_t ctx_cxy = GET_CXY( ctx_xp );
136	vfs_ctx_t * ctx_ptr = GET_PTR( ctx_xp );
137
138	// build extended pointer on inum bitmap
139	xptr_t bitmap_xp = XPTR( ctx_cxy , &ctx_ptr->bitmap );
140
141	// build extended pointer on lock
142	xptr_t lock_xp = XPTR( ctx_cxy , &ctx_ptr->lock );
143
144	// get lock
145	remote_busylock_acquire( lock_xp );
146
147	bitmap_remote_clear( bitmap_xp , inum & 0xFFFF );
148
149	// release lock
150	remote_busylock_release( lock_xp );
151
152	} // end vfs_ctx_inum_release()
153
154	//////////////////////////////////////////////////////////////////////////////////////////
155	// VFS inode descriptor related functions
156	//////////////////////////////////////////////////////////////////////////////////////////
157
158	const char * vfs_inode_type_str( vfs_file_type_t type )
159	{
160	switch ( type )
161	{
162	case FILE_TYPE_REG: return "FILE";
163	case FILE_TYPE_DIR: return "DIR ";
164	case FILE_TYPE_FIFO: return "FIFO";
165	case FILE_TYPE_PIPE: return "PIPE";
166	case FILE_TYPE_SOCK: return "SOCK";
167	case FILE_TYPE_DEV: return "DEV ";
168	case FILE_TYPE_BLK: return "BLK ";
169	case FILE_TYPE_SYML: return "SYML";
170	default: return "undefined";
171	}
172	}
173
174	////////////////////////////////////////////////
175	error_t vfs_inode_create( cxy_t cxy,
176	vfs_fs_type_t fs_type,
177	uint32_t attr,
178	uint32_t rights,
179	uid_t uid,
180	gid_t gid,
181	xptr_t * inode_xp )
182	{
183	xptr_t mapper_xp; // extended pointer on associated mapper
184	mapper_t * mapper_ptr; // local pointer on associated mapper
185	vfs_inode_t * inode_ptr; // local pointer on allocated inode
186	uint32_t inum; // inode identifier (to be allocated)
187	vfs_ctx_t * ctx; // file system context
188	kmem_req_t req; // request to kernel memory allocator
189	error_t error;
190
191	#if DEBUG_VFS_INODE_CREATE \|\| DEBUG_VFS_ERROR
192	uint32_t cycle = (uint32_t)hal_get_cycles();
193	thread_t * this = CURRENT_THREAD;
194	#endif
195
196	// check fs type and get pointer on context
197	if ( fs_type == FS_TYPE_FATFS ) ctx = &fs_context[FS_TYPE_FATFS];
198	else if( fs_type == FS_TYPE_RAMFS ) ctx = &fs_context[FS_TYPE_RAMFS];
199	else if( fs_type == FS_TYPE_DEVFS ) ctx = &fs_context[FS_TYPE_DEVFS];
200	else
201	{
202
203	#if DEBUG_VFS_ERROR
204	if( DEBUG_VFS_ERROR < cycle )
205	printk("\n[ERROR] in %s : thread[%x,%x] / illegal FS type\n",
206	__FUNCTION__ , this->process->pid , this->trdid );
207	#endif
208	return -1;
209	}
210
211	// check inode descriptor contained in one page
212	assert( __FUNCTION__, (sizeof(vfs_inode_t) <= CONFIG_PPM_PAGE_SIZE),
213	"inode descriptor must fit in one page" );
214
215	// allocate inum
216	error = vfs_ctx_inum_alloc( XPTR( cxy , ctx ) , &inum );
217
218	if( error )
219	{
220
221	#if DEBUG_VFS_ERROR
222	if( DEBUG_VFS_ERROR < cycle )
223	printk("\n[ERROR] in %s : thread[%x,%x] cannot allocate inum\n",
224	__FUNCTION__ , this->process->pid , this->trdid );
225	#endif
226	return -1;
227	}
228
229	// allocate memory for mapper in cluster cxy
230	mapper_xp = mapper_create( cxy , fs_type );
231
232	if( mapper_xp == XPTR_NULL )
233	{
234
235	#if DEBUG_VFS_ERROR
236	if( DEBUG_VFS_ERROR < cycle )
237	printk("\n[ERROR] in %s : thread[%x,%x] cannot allocate mapper\n",
238	__FUNCTION__ , this->process->pid , this->trdid );
239	#endif
240	vfs_ctx_inum_release( XPTR( cxy , ctx ) , inum );
241	return -1;
242	}
243
244	mapper_ptr = GET_PTR( mapper_xp );
245
246	// allocate one page for VFS inode descriptor
247	// because the embedded "children" xhtab footprint
248	req.type = KMEM_PPM;
249	req.order = 0;
250	req.flags = AF_KERNEL \| AF_ZERO;
251	inode_ptr = kmem_remote_alloc( cxy , &req );
252
253	if( inode_ptr == NULL )
254	{
255
256	#if DEBUG_VFS_ERROR
257	if( DEBUG_VFS_ERROR < cycle )
258	printk("\n[ERROR] in %s : thread[%x,%x] cannot allocate inode\n",
259	__FUNCTION__ , this->process->pid , this->trdidi );
260	#endif
261	vfs_ctx_inum_release( XPTR( cxy , ctx ) , inum );
262	mapper_destroy( mapper_xp );
263	return -1;
264	}
265
266	// initialise inode field in mapper
267	hal_remote_spt( XPTR( cxy , &mapper_ptr->inode ) , inode_ptr );
268
269	// initialize inode descriptor
270	hal_remote_s32( XPTR( cxy , &inode_ptr->type ) , FILE_TYPE_REG ); // default value
271	hal_remote_s32( XPTR( cxy , &inode_ptr->inum ) , inum );
272	hal_remote_s32( XPTR( cxy , &inode_ptr->attr ) , attr );
273	hal_remote_s32( XPTR( cxy , &inode_ptr->rights ) , rights );
274	hal_remote_s32( XPTR( cxy , &inode_ptr->links ) , 0 );
275	hal_remote_s32( XPTR( cxy , &inode_ptr->uid ) , uid );
276	hal_remote_s32( XPTR( cxy , &inode_ptr->gid ) , gid );
277	hal_remote_spt( XPTR( cxy , &inode_ptr->ctx ) , ctx );
278	hal_remote_spt( XPTR( cxy , &inode_ptr->mapper ) , mapper_ptr );
279	hal_remote_spt( XPTR( cxy , &inode_ptr->extend ) , NULL );
280
281	// initialize chidren dentries xhtab
282	xhtab_init( XPTR( cxy , &inode_ptr->children ) , XHTAB_DENTRY_TYPE );
283
284	// initialize parents dentries xlist
285	xlist_root_init( XPTR( cxy , &inode_ptr->parents ) );
286
287	// initialize lock protecting size
288	remote_rwlock_init( XPTR( cxy , &inode_ptr->size_lock ), LOCK_VFS_SIZE );
289
290	// initialise lock protecting inode tree traversal
291	remote_rwlock_init( XPTR( cxy , &inode_ptr->main_lock ), LOCK_VFS_MAIN );
292
293	// return extended pointer on inode
294	*inode_xp = XPTR( cxy , inode_ptr );
295
296	#if DEBUG_VFS_INODE_CREATE
297	if( DEBUG_VFS_INODE_CREATE < cycle )
298	printk("\n[%s] thread[%x,%x] created inode (%x,%x) / ctx %x / fs_type %d / cycle %d\n",
299	__FUNCTION__, this->process->pid, this->trdid, cxy, inode_ptr, ctx, ctx->type, cycle );
300	#endif
301
302	return 0;
303
304	} // end vfs_inode_create()
305
306	//////////////////////////////////////////
307	void vfs_inode_destroy( xptr_t inode_xp )
308	{
309	// get cluster and local pointer
310	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
311	cxy_t inode_cxy = GET_CXY( inode_xp );
312
313	// get local pointer on mapper
314	mapper_t * mapper_ptr = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ));
315
316	// release memory allocated for mapper
317	mapper_destroy( XPTR( inode_cxy , mapper_ptr ) );
318
319	// release memory allocated for inode descriptor
320	kmem_req_t req;
321	req.type = KMEM_PPM;
322	req.ptr = inode_ptr;
323	kmem_remote_free( inode_cxy , &req );
324
325	} // end vfs_inode_destroy()
326
327	//////////////////////////////////////////////
328	uint32_t vfs_inode_get_size( xptr_t inode_xp )
329	{
330	// get inode cluster and local pointer
331	cxy_t cxy = GET_CXY( inode_xp );
332	vfs_inode_t * ptr = GET_PTR( inode_xp );
333
334	// build extended pointers on lock & size
335	xptr_t lock_xp = XPTR( cxy , &ptr->size_lock );
336	xptr_t size_xp = XPTR( cxy , &ptr->size );
337
338	// take lock in read mode
339	remote_rwlock_rd_acquire( lock_xp );
340
341	// get size
342	uint32_t size = hal_remote_l32( size_xp );
343
344	// release lock from read mode
345	remote_rwlock_rd_release( lock_xp );
346
347	return size;
348	}
349
350	///////////////////////////////////////////////
351	void vfs_inode_update_size( xptr_t inode_xp,
352	uint32_t size )
353	{
354	// get inode cluster and local pointer
355	cxy_t cxy = GET_CXY( inode_xp );
356	vfs_inode_t * ptr = GET_PTR( inode_xp );
357
358	// build extended pointers on lock & size
359	xptr_t lock_xp = XPTR( cxy , &ptr->size_lock );
360	xptr_t size_xp = XPTR( cxy , &ptr->size );
361
362	// take lock in write mode
363	remote_rwlock_wr_acquire( lock_xp );
364
365	// get current size
366	uint32_t current_size = hal_remote_l32( size_xp );
367
368	// set size if required
369	if( current_size < size ) hal_remote_s32( size_xp , size );
370
371	// release lock from write mode
372	remote_rwlock_wr_release( lock_xp );
373	}
374
375	////////////////////////////////////////
376	void vfs_inode_unlock( xptr_t inode_xp )
377	{
378	// get inode cluster and local pointer
379	cxy_t cxy = GET_CXY( inode_xp );
380	vfs_inode_t * ptr = GET_PTR( inode_xp );
381
382	// release the main lock
383	remote_busylock_release( XPTR( cxy , &ptr->main_lock ) );
384	}
385
386	//////////////////////////////////////
387	void vfs_inode_lock( xptr_t inode_xp )
388	{
389	// get inode cluster and local pointer
390	cxy_t cxy = GET_CXY( inode_xp );
391	vfs_inode_t * ptr = GET_PTR( inode_xp );
392
393	// get the main lock
394	remote_busylock_acquire( XPTR( cxy , &ptr->main_lock ) );
395	}
396
397	///////////////////////////////////////////
398	void vfs_inode_get_name( xptr_t inode_xp,
399	char * name )
400	{
401	cxy_t inode_cxy; // inode cluster identifier
402	vfs_inode_t * inode_ptr; // local pointer on inode
403	xptr_t parents_root_xp; // extended pointer on inode parents root
404
405	// get inode cluster and local pointer
406	inode_ptr = GET_PTR( inode_xp );
407	inode_cxy = GET_CXY( inode_xp );
408
409	// build extended pointer on parents dentries root
410	parents_root_xp = XPTR( inode_cxy , &inode_ptr->parents );
411
412	// check VFS root
413	if( xlist_is_empty( parents_root_xp ) ) // inode is the VFS root
414	{
415	strcpy( name , "/" );
416	}
417	else // not the VFS root
418	{
419	xptr_t dentry_xp;
420	cxy_t dentry_cxy;
421	vfs_dentry_t * dentry_ptr;
422
423	// get first name in list of parents
424	dentry_xp = XLIST_FIRST( parents_root_xp , vfs_dentry_t , parents );
425	dentry_cxy = GET_CXY( dentry_xp );
426	dentry_ptr = GET_PTR( dentry_xp );
427
428	hal_remote_strcpy( XPTR( local_cxy , name ) ,
429	XPTR( dentry_cxy , dentry_ptr->name ) );
430	}
431
432	} // end vfs_inode_get_name()
433
434	////////////////////////////////////////////////////
435	error_t vfs_inode_load_all_pages( xptr_t inode_xp )
436	{
437	uint32_t page_id;
438	xptr_t page_xp;
439
440
441	// get inode cluster and local pointer
442	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
443	cxy_t inode_cxy = GET_CXY( inode_xp );
444
445	// get pointer on mapper and size
446	mapper_t * mapper = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
447	uint32_t size = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->size ) );
448
449	#if DEBUG_VFS_INODE_LOAD_ALL
450	char name[CONFIG_VFS_MAX_NAME_LENGTH];
451	uint32_t cycle = (uint32_t)hal_get_cycles();
452	thread_t * this = CURRENT_THREAD;
453	vfs_inode_get_name( inode_xp , name );
454	if( DEBUG_VFS_INODE_LOAD_ALL < cycle )
455	printk("\n[%s] thread[%x,%x] enter for <%s> in cluster %x / cycle %d\n",
456	__FUNCTION__, this->process->pid, this->trdid, name, inode_cxy, cycle );
457	#endif
458
459	// compute number of pages
460	uint32_t npages = size >> CONFIG_PPM_PAGE_SHIFT;
461	if( (size & CONFIG_PPM_PAGE_MASK) \|\| (size == 0) ) npages++;
462
463	// loop on pages
464	for( page_id = 0 ; page_id < npages ; page_id ++ )
465	{
466	// If the mage is missing, this function allocates the missing page,
467	// and load the page from IOC device into mapper
468	page_xp = mapper_get_page( XPTR( inode_cxy , mapper ), page_id );
469
470	if( page_xp == XPTR_NULL ) return -1;
471	}
472
473	#if DEBUG_VFS_INODE_LOAD_ALL
474	cycle = (uint32_t)hal_get_cycles();
475	if( DEBUG_VFS_INODE_LOAD_ALL < cycle )
476	printk("\n[%s] thread[%x,%x] exit for <%s> in cluster %x\n",
477	__FUNCTION__, this->process->pid, this->trdid, name, inode_cxy );
478	#endif
479
480	return 0;
481
482	} // end vfs_inode_load_all_pages()
483
484	/////////////////////////////////////////
485	void vfs_inode_display( xptr_t inode_xp )
486	{
487	assert( __FUNCTION__, (inode_xp != XPTR_NULL), "inode pointer is NULL");
488
489	char name[CONFIG_VFS_MAX_NAME_LENGTH];
490
491	vfs_inode_get_name( inode_xp , name );
492
493	// get inode cluster and local pointer
494	cxy_t inode_cxy = GET_CXY( inode_xp );
495	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
496
497	vfs_file_type_t type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
498	uint32_t attr = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->attr ) );
499	uint32_t size = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->size ) );
500	uint32_t parents = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->links ) );
501	mapper_t * mapper = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
502	void * extend = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->extend ) );
503
504	printk("\n**** inode <%s>\n"
505	" - type = %s\n"
506	" - attr = %x\n"
507	" - size = %d\n"
508	" - parents = %d\n"
509	" - cxy = %x\n"
510	" - inode = %x\n"
511	" - mapper = %x\n"
512	" - extend = %x\n",
513	name,
514	vfs_inode_type_str( type ),
515	attr,
516	size,
517	parents,
518	inode_cxy,
519	inode_ptr,
520	mapper,
521	extend );
522
523	} // end vfs_inode_display()
524
525
526	////////////////////////////////////////////////////////////////////////////////////////////
527	// VFS dentry descriptor related functions
528	//////////////////////////////////////////////////////////////////////////////////////////
529
530	///////////////////////////////////////////////
531	error_t vfs_dentry_create( cxy_t cxy,
532	vfs_fs_type_t fs_type,
533	char * name,
534	xptr_t * dentry_xp )
535	{
536	kmem_req_t req; // request to kernel memory allocator
537	vfs_ctx_t * ctx = NULL; // context descriptor
538	vfs_dentry_t * dentry_ptr; // dentry descriptor (to be allocated)
539
540	#if DEBUG_VFS_DENTRY_CREATE \|\| DEBUG_VFS_ERROR
541	thread_t * this = CURRENT_THREAD;
542	uint32_t cycle = (uint32_t)hal_get_cycles();
543	#endif
544
545	#if DEBUG_VFS_DENTRY_CREATE
546	if( DEBUG_VFS_DENTRY_CREATE < cycle )
547	printk("\n[%s] thread[%x,%x] enters for <%s> / fs_type %x / cycle %d\n",
548	__FUNCTION__, this->process->pid, this->trdid, name, fs_type, cycle );
549	#endif
550
551	// get pointer on context
552	if ( fs_type == FS_TYPE_FATFS ) ctx = &fs_context[FS_TYPE_FATFS];
553	else if( fs_type == FS_TYPE_RAMFS ) ctx = &fs_context[FS_TYPE_RAMFS];
554	else if( fs_type == FS_TYPE_DEVFS ) ctx = &fs_context[FS_TYPE_DEVFS];
555	else
556	{
557
558	#if DEBUG_VFS_ERROR
559	if( DEBUG_VFS_ERROR < cycle )
560	printk("\n[ERROR] in %s : thread[%x,%x] / undefined fs_type %d\n",
561	__FUNCTION__ , this->process->pid, this->trdid, fs_type );
562	#endif
563	return -1;
564	}
565
566	// get name length
567	uint32_t length = strlen( name );
568
569	if( length >= CONFIG_VFS_MAX_NAME_LENGTH ) return -1;
570
571	// allocate memory for dentry descriptor
572	req.type = KMEM_KCM;
573	req.order = bits_log2( sizeof(vfs_dentry_t) );
574	req.flags = AF_KERNEL \| AF_ZERO;
575	dentry_ptr = kmem_remote_alloc( cxy , &req );
576
577	if( dentry_ptr == NULL )
578	{
579
580	#if DEBUG_VFS_ERROR
581	if( DEBUG_VFS_ERROR < cycle )
582	printk("\n[ERROR] in %s : thread[%x,%x] cannot allocate dentry descriptor\n",
583	__FUNCTION__ , this->process->pid, this->trdid );
584	#endif
585	return -1;
586	}
587
588	// initialize dentry descriptor
589	hal_remote_spt( XPTR( cxy , &dentry_ptr->ctx ) , ctx );
590	hal_remote_s32( XPTR( cxy , &dentry_ptr->length ) , length );
591	hal_remote_spt( XPTR( cxy , &dentry_ptr->extend ) , NULL );
592
593	// register name
594	hal_remote_strcpy( XPTR( cxy, dentry_ptr->name ),
595	XPTR( local_cxy, name ) );
596
597	// return extended pointer on dentry
598	*dentry_xp = XPTR( cxy , dentry_ptr );
599
600	#if DEBUG_VFS_DENTRY_CREATE
601	if( DEBUG_VFS_DENTRY_CREATE < cycle )
602	printk("\n[%s] thread[%x,%x] exit for <%s> / dentry (%x,%x)\n",
603	__FUNCTION__, this->process->pid, this->trdid, name, cxy, dentry_ptr );
604	#endif
605
606	return 0;
607
608	} // end vfs_dentry_create()
609
610	////////////////////////////////////////////
611	void vfs_dentry_destroy( xptr_t dentry_xp )
612	{
613	// get cluster and local pointer
614	vfs_dentry_t * dentry_ptr = GET_PTR( dentry_xp );
615	cxy_t dentry_cxy = GET_CXY( dentry_xp );
616
617	// release memory allocated to dentry
618	kmem_req_t req;
619	req.type = KMEM_KCM;
620	req.ptr = dentry_ptr;
621	kmem_remote_free( dentry_cxy , &req );
622
623	} // end vfs_dentry_destroy()
624
625
626	//////////////////////////////////////////////////////////////////////////////////////////
627	// VFS file descriptor related functions
628	//////////////////////////////////////////////////////////////////////////////////////////
629
630	/////////////////////////////////////////////
631	error_t vfs_file_create( xptr_t inode_xp,
632	uint32_t attr,
633	xptr_t * file_xp )
634	{
635	vfs_file_t * file_ptr;
636	kmem_req_t req;
637	uint32_t type;
638	mapper_t * mapper;
639	pipe_t * pipe;
640	vfs_ctx_t * ctx;
641
642	// get inode cluster and local pointer
643	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
644	cxy_t inode_cxy = GET_CXY( inode_xp );
645
646	#if DEBUG_VFS_FILE_CREATE
647	thread_t * this = CURRENT_THREAD;
648	uint32_t cycle = (uint32_t)hal_get_cycles();
649	if( DEBUG_VFS_FILE_CREATE < cycle )
650	printk("\n[%s] thread[%x,%x] enter for inode (%x,%x) / cycle %d\n",
651	__FUNCTION__, this->process->pid, this->trdid, inode_cxy, inode_ptr, cycle );
652	#endif
653
654	// allocate memory for new file descriptor
655	req.type = KMEM_KCM;
656	req.order = bits_log2( sizeof(vfs_file_t) );
657	req.flags = AF_KERNEL \| AF_ZERO;
658	file_ptr = kmem_remote_alloc( inode_cxy , &req );
659
660	if( file_ptr == NULL ) return -1;
661
662	// get type, ctx, mapper, and buffer from inode descriptor
663	type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
664	ctx = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->ctx ) );
665	mapper = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
666	pipe = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->pipe ) );
667
668	// initializes new file descriptor
669	hal_remote_s32( XPTR( inode_cxy , &file_ptr->type ) , type );
670	hal_remote_s32( XPTR( inode_cxy , &file_ptr->attr ) , attr );
671	hal_remote_spt( XPTR( inode_cxy , &file_ptr->ctx ) , ctx );
672	hal_remote_s32( XPTR( inode_cxy , &file_ptr->offset ) , 0 );
673	hal_remote_spt( XPTR( inode_cxy , &file_ptr->inode ) , inode_ptr );
674	hal_remote_spt( XPTR( inode_cxy , &file_ptr->mapper ) , mapper );
675	hal_remote_spt( XPTR( inode_cxy , &file_ptr->pipe ) , pipe );
676
677	remote_rwlock_init( XPTR( inode_cxy , &file_ptr->lock ), LOCK_VFS_FILE );
678
679	*file_xp = XPTR( inode_cxy , file_ptr );
680
681	#if DEBUG_VFS_FILE_CREATE
682	if( (DEBUG_VFS_FILE_CREATE < cycle) && (type == FILE_TYPE_REG))
683	{
684	char name[CONFIG_VFS_MAX_NAME_LENGTH];
685	vfs_file_get_name( XPTR( inode_cxy , file_ptr ) , name );
686	printk("\n[%s] thread[%x,%x] created file (%x,%x) / %s (%s)\n",
687	__FUNCTION__, this->process->pid, this->trdid,
688	inode_cxy, file_ptr, vfs_inode_type_str(type), name );
689	}
690	if( (DEBUG_VFS_FILE_CREATE < cycle) && (type != FILE_TYPE_REG))
691	{
692	printk("\n[%s] thread[%x,%x] created file (%x,%x) / %s\n",
693	__FUNCTION__, this->process->pid, this->trdid,
694	inode_cxy, file_ptr, vfs_inode_type_str(type) );
695	}
696	#endif
697
698	return 0;
699
700	} // end vfs_file_create()
701
702	////////////////////////////////////////
703	void vfs_file_destroy( xptr_t file_xp )
704	{
705	// get file cluster and local pointer
706	vfs_file_t * file_ptr = GET_PTR( file_xp );
707	cxy_t file_cxy = GET_CXY( file_xp );
708
709	#if DEBUG_VFS_FILE_DESTROY
710	char name[CONFIG_VFS_MAX_NAME_LENGTH];
711	vfs_file_get_name( file_xp , name );
712	thread_t * this = CURRENT_THREAD;
713	uint32_t cycle = (uint32_t)hal_get_cycles();
714	if( DEBUG_VFS_FILE_DESTROY < cycle )
715	printk("\n[%s] thread[%x,%x] enter / file_ptr %x / file_cxy %x / <%s> / cycle %d\n",
716	__FUNCTION__, this->process->pid, this->trdid, file_ptr, file_cxy, name, cycle );
717	#endif
718
719	// release file descriptor
720	kmem_req_t req;
721	req.type = KMEM_KCM;
722	req.ptr = file_ptr;
723	kmem_remote_free( file_cxy , &req );
724
725	#if DEBUG_VFS_FILE_DESTROY
726	cycle = (uint32_t)hal_get_cycles();
727	if( DEBUG_VFS_FILE_DESTROY < cycle )
728	printk("\n[%s] thread[%x,%x] exit for <%s> / cycle %d\n",
729	__FUNCTION__, this->process->pid, this->trdid, file_ptr, file_cxy, name, cycle );
730	#endif
731
732	} // end vfs_file_destroy()
733
734	///////////////////////////////////////
735	void vfs_file_get_name( xptr_t file_xp,
736	char * name )
737	{
738	// get cluster and local pointer on remote file
739	vfs_file_t * file_ptr = GET_PTR( file_xp );
740	cxy_t file_cxy = GET_CXY( file_xp );
741
742	// get pointers on remote inode
743	vfs_inode_t * inode_ptr = hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
744	xptr_t inode_xp = XPTR( file_cxy , inode_ptr );
745
746	// call the relevant function
747	vfs_inode_get_name( inode_xp , name );
748	}
749
750
751	//////////////////////////////////////////////////////////////////////////////////////////
752	// "syscalls" API related functions
753	//////////////////////////////////////////////////////////////////////////////////////////
754
755	//////////////////////////////////////
756	error_t vfs_open( xptr_t root_xp,
757	char * path,
758	xptr_t process_xp,
759	uint32_t flags,
760	uint32_t mode,
761	xptr_t * new_file_xp,
762	uint32_t * new_file_id )
763	{
764	error_t error;
765	xptr_t inode_xp; // extended pointer on target inode
766	cxy_t inode_cxy; // inode cluster identifier
767	vfs_inode_t * inode_ptr; // inode local pointer
768	uint32_t file_attr; // file descriptor attributes
769	uint32_t lookup_mode; // lookup working mode
770	xptr_t file_xp; // extended pointer on created file descriptor
771	uint32_t file_id; // created file descriptor index in reference fd_array
772	xptr_t vfs_root_xp; // extended pointer on VFS root inode
773	vfs_inode_t * vfs_root_ptr; // local pointer on VFS root inode
774	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
775	xptr_t lock_xp; // extended pointer on Inode Tree lock
776
777	if( mode != 0 )
778	{
779	printk("\n[ERROR] in %s : the mode parameter is not supported yet\n" );
780	return -1;
781	}
782
783	thread_t * this = CURRENT_THREAD;
784	process_t * process = this->process;
785
786	// compute lookup working mode
787	lookup_mode = VFS_LOOKUP_OPEN;
788	if( (flags & O_DIR ) ) lookup_mode \|= VFS_LOOKUP_DIR;
789	if( (flags & O_CREAT ) ) lookup_mode \|= VFS_LOOKUP_CREATE;
790	if( (flags & O_EXCL ) ) lookup_mode \|= VFS_LOOKUP_EXCL;
791
792	#if DEBUG_VFS_OPEN \|\| DEBUG_VFS_ERROR
793	uint32_t cycle = (uint32_t)hal_get_cycles();
794	#endif
795
796	#if DEBUG_VFS_OPEN
797	if( DEBUG_VFS_OPEN < cycle )
798	printk("\n[%s] thread[%x,%x] enter for <%s> / root_inode (%x,%x) / cycle %d\n",
799	__FUNCTION__, process->pid, this->trdid, path, GET_CXY(root_xp), GET_PTR(root_xp), cycle );
800	#endif
801
802	// compute attributes for the created file
803	file_attr = 0;
804	if( (flags & O_RDONLY ) == 0 ) file_attr \|= FD_ATTR_WRITE_ENABLE;
805	if( (flags & O_WRONLY ) == 0 ) file_attr \|= FD_ATTR_READ_ENABLE;
806	if( (flags & O_SYNC ) ) file_attr \|= FD_ATTR_SYNC;
807	if( (flags & O_APPEND ) ) file_attr \|= FD_ATTR_APPEND;
808	if( (flags & O_CLOEXEC) ) file_attr \|= FD_ATTR_CLOSE_EXEC;
809
810	// build extended pointer on lock protecting Inode Tree
811	vfs_root_xp = process->vfs_root_xp;
812	vfs_root_ptr = GET_PTR( vfs_root_xp );
813	vfs_root_cxy = GET_CXY( vfs_root_xp );
814	lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
815
816	// take lock protecting Inode Tree in read mode
817	remote_rwlock_rd_acquire( lock_xp );
818
819	// get extended pointer on target inode
820	error = vfs_lookup( root_xp,
821	path,
822	lookup_mode,
823	&inode_xp,
824	NULL );
825
826	// release lock protecting Inode Tree
827	remote_rwlock_rd_release( lock_xp );
828
829	if( error )
830	{
831
832	#if DEBUG_VFS_ERROR
833	if( DEBUG_VFS_ERROR < cycle )
834	printk("\n[ERROR] in %s : thread[%x,%x] cannot get inode <%s>\n",
835	__FUNCTION__ , process->pid, this->trdid , path );
836	#endif
837	return -1;
838	}
839
840	// get target inode cluster and local pointer
841	inode_cxy = GET_CXY( inode_xp );
842	inode_ptr = GET_PTR( inode_xp );
843
844	#if (DEBUG_VFS_OPEN & 1)
845	cycle = (uint32_t)hal_get_cycles();
846	if( DEBUG_VFS_OPEN < cycle )
847	printk("\n[%s] thread[%x,%x] found inode(%x,%x) for <%s>\n",
848	__FUNCTION__, process->pid, this->trdid, inode_cxy, inode_ptr, path );
849	#endif
850
851	// create a new file descriptor in cluster containing inode
852	error = vfs_file_create( inode_xp , file_attr , &file_xp );
853
854	if( error ) return error;
855
856	#if (DEBUG_VFS_OPEN & 1)
857	cycle = (uint32_t)hal_get_cycles();
858	if( DEBUG_VFS_OPEN < cycle )
859	printk("\n[%s] thread[%x,%x] created file descriptor (%x,%x) for <%s>\n",
860	__FUNCTION__, process->pid, this->trdid, GET_CXY(file_xp), GET_PTR(file_xp), path );
861	#endif
862
863	// allocate and register a new file descriptor index in reference process
864	error = process_fd_register( process_xp , file_xp , &file_id );
865
866	if( error ) return error;
867
868	// get new file descriptor cluster and local pointer
869	cxy_t file_cxy = GET_CXY( file_xp );
870	vfs_file_t * file_ptr = GET_PTR( file_xp );
871
872	//get file type
873	uint32_t file_type = hal_remote_l32( XPTR( file_cxy , &file_ptr->type ));
874
875	// link the client thead to the pipe for a FIFO type
876	if( file_type == FILE_TYPE_FIFO )
877	{
878	// get local pointer on attached pipe
879	pipe_t * pipe = hal_remote_lpt( XPTR( file_cxy , &file_ptr->pipe ));
880
881	// build extended pointer on client thread
882	xptr_t thread_xp = XPTR( local_cxy , this );
883
884	// update pipe descriptor
885	if( flags & O_RDONLY ) hal_remote_s64( XPTR(file_cxy,&pipe->reader_xp) , thread_xp );
886	if( flags & O_WRONLY ) hal_remote_s64( XPTR(file_cxy,&pipe->writer_xp) , thread_xp );
887	}
888
889	#if DEBUG_VFS_OPEN
890	cycle = (uint32_t)hal_get_cycles();
891	if( DEBUG_VFS_OPEN < cycle )
892	printk("\n[%s] thread[%x,%x] exit for <%s> / fdid %d / file(%x,%x) / cycle %d\n",
893	__FUNCTION__, process->pid, this->trdid, path, file_id,
894	GET_CXY( file_xp ), GET_PTR( file_xp ), cycle );
895	#endif
896
897	// success
898	*new_file_xp = file_xp;
899	*new_file_id = file_id;
900	return 0;
901
902	} // end vfs_open()
903
904	///////////////////////////////////////////
905	uint32_t vfs_user_move( bool_t to_buffer,
906	xptr_t file_xp,
907	void * buffer,
908	uint32_t count )
909	{
910	cxy_t file_cxy; // remote file descriptor cluster
911	vfs_file_t * file_ptr; // remote file descriptor local pointer
912	mapper_t * mapper; // local pointer on file mapper
913	vfs_inode_t * inode; // local pointer on file inode
914	vfs_file_type_t type; // inode type
915	uint32_t offset; // current offset in file
916	uint32_t size; // current file size
917	uint32_t nbytes; // number of bytes actually transfered
918	error_t error;
919
920	// check argument
921	assert( __FUNCTION__, (file_xp != XPTR_NULL), "file_xp == XPTR_NULL" );
922
923	// get cluster and local pointer on remote file descriptor
924	file_cxy = GET_CXY( file_xp );
925	file_ptr = GET_PTR( file_xp );
926
927	// get various infos from remote file descriptor
928	type = hal_remote_l32( XPTR( file_cxy , &file_ptr->type ) );
929	offset = hal_remote_l32( XPTR( file_cxy , &file_ptr->offset ) );
930	mapper = hal_remote_lpt( XPTR( file_cxy , &file_ptr->mapper ) );
931	inode = hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
932	size = hal_remote_l32( XPTR( file_cxy , &inode->size ) );
933
934	// check inode type
935	assert( __FUNCTION__, (type == FILE_TYPE_REG), "bad inode type" );
936
937	#if DEBUG_VFS_USER_MOVE \|\| DEBUG_VFS_ERROR
938	uint32_t cycle = (uint32_t)hal_get_cycles();
939	thread_t * this = CURRENT_THREAD;
940	#endif
941
942	#if DEBUG_VFS_USER_MOVE
943	char name[CONFIG_VFS_MAX_NAME_LENGTH];
944	vfs_inode_get_name( XPTR( file_cxy , inode ) , name );
945	if( cycle > DEBUG_VFS_USER_MOVE )
946	{
947	if( to_buffer )
948	printk("\n[%s] thread[%x,%x] enter / %d bytes / map(%s) -> buf(%x) / offset %d / cycle %d\n",
949	__FUNCTION__ , this->process->pid, this->trdid, count, name, buffer, offset, cycle );
950	else
951	printk("\n[%s] thread[%x,%x] enter / %d bytes / buf(%x) -> map(%s) / offset %d / cycle %d\n",
952	__FUNCTION__ , this->process->pid, this->trdid, count, buffer, name, offset, cycle );
953	}
954	#endif
955
956	if( to_buffer ) // => compute the number of bytes to move and make the move
957	{
958	// compute number of bytes to move
959	if ( size <= offset ) nbytes = 0;
960	else if( size < offset + count ) nbytes = size - offset;
961	else nbytes = count;
962
963	// move data from mapper to buffer when required
964	if( nbytes > 0 )
965	{
966	error = mapper_move_user( XPTR( file_cxy , mapper ),
967	to_buffer,
968	offset,
969	buffer,
970	nbytes );
971	}
972	else
973	{
974	error = 0;
975	}
976	}
977	else // to mapper => make the move and update the file size if required
978	{
979	nbytes = count;
980
981	// move data from buffer to mapper
982	error = mapper_move_user( XPTR( file_cxy , mapper ),
983	to_buffer,
984	offset,
985	buffer,
986	count );
987
988	// update file size in inode if required
989	if( offset + count > size )
990	{
991	vfs_inode_update_size( XPTR( file_cxy , inode ) , offset + count );
992	}
993	}
994
995	if( error )
996	{
997
998	#if DEBUG_VFS_ERROR
999	if( DEBUG_VFS_ERROR < cycle )
1000	printk("\n[ERROR] in %s thread[%x,%x] cannot move data",
1001	__FUNCTION__, this->process->pid, this->trdid );
1002	#endif
1003	return -1;
1004	}
1005
1006	// update file offset in file descriptor
1007	hal_remote_atomic_add( XPTR( file_cxy , &file_ptr->offset ) , nbytes );
1008
1009	#if DEBUG_VFS_USER_MOVE
1010	cycle = (uint32_t)hal_get_cycles();
1011	if( cycle > DEBUG_VFS_USER_MOVE )
1012	{
1013	if( to_buffer )
1014	printk("\n[%s] thread[%x,%x] exit / %d bytes moved from mapper to buffer\n",
1015	__FUNCTION__ , this->process->pid, nbytes );
1016	else
1017	printk("\n[%s] thread[%x,%x] exit / %d bytes moved from buffer to mapper\n",
1018	__FUNCTION__ , this->process->pid, nbytes );
1019	}
1020	#endif
1021
1022	return nbytes;
1023
1024	} // end vfs_user_move()
1025
1026	////////////////////////////////////////////
1027	error_t vfs_kernel_move( bool_t to_buffer,
1028	xptr_t file_xp,
1029	xptr_t buffer_xp,
1030	uint32_t size )
1031	{
1032	cxy_t file_cxy; // remote file descriptor cluster
1033	vfs_file_t * file_ptr; // remote file descriptor local pointer
1034	vfs_file_type_t inode_type; // remote file type
1035	uint32_t file_offset; // current offset in file
1036	mapper_t * mapper_ptr; // remote mapper local pointer
1037	xptr_t mapper_xp; // remote mapper extended pointer
1038	error_t error;
1039
1040	// check argument
1041	assert( __FUNCTION__, (file_xp != XPTR_NULL) , "file_xp == XPTR_NULL" );
1042
1043	// get cluster and local pointer on remote file descriptor
1044	file_cxy = GET_CXY( file_xp );
1045	file_ptr = GET_PTR( file_xp );
1046
1047	// get inode type from remote file descriptor
1048	inode_type = hal_remote_l32( XPTR( file_cxy , &file_ptr->type ) );
1049
1050	// check inode type
1051	assert( __FUNCTION__, (inode_type == FILE_TYPE_REG), "bad file type" );
1052
1053	// get mapper pointers and file offset from file descriptor
1054	file_offset = hal_remote_l32( XPTR( file_cxy , &file_ptr->offset ) );
1055	mapper_ptr = hal_remote_lpt( XPTR( file_cxy , &file_ptr->mapper ) );
1056	mapper_xp = XPTR( file_cxy , mapper_ptr );
1057
1058	// move data between mapper and buffer
1059	error = mapper_move_kernel( mapper_xp,
1060	to_buffer,
1061	file_offset,
1062	buffer_xp,
1063	size );
1064	if( error )
1065	{
1066	printk("\n[ERROR] in %s : cannot move data", __FUNCTION__ );
1067	return -1;
1068	}
1069
1070	#if DEBUG_VFS_KERNEL_MOVE
1071	char name[CONFIG_VFS_MAX_NAME_LENGTH];
1072	uint32_t cycle = (uint32_t)hal_get_cycles();
1073	thread_t * this = CURRENT_THREAD;
1074	cxy_t buffer_cxy = GET_CXY( buffer_xp );
1075	void * buffer_ptr = GET_PTR( buffer_xp );
1076	vfs_inode_t * inode = hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
1077	vfs_inode_get_name( XPTR( file_cxy , inode ) , name );
1078	if( cycle > DEBUG_VFS_KERNEL_MOVE )
1079	{
1080	if( to_buffer )
1081	printk("\n[%s] thread[%x,%x] moves %d bytes from <%s> mapper to buffer(%x,%x) / cycle %d\n",
1082	__FUNCTION__ , this->process->pid, this->trdid, size, name, buffer_cxy, buffer_ptr );
1083	else
1084	printk("\n[%s] thread[%x,%x] moves %d bytes from buffer(%x,%x) to <%s> mapper / cycle %d\n",
1085	__FUNCTION__ , this->process->pid, this->trdid, size, buffer_cxy, buffer_ptr, name );
1086	}
1087	#endif
1088
1089	return 0;
1090
1091	} // end vfs_kernel_move()
1092
1093	//////////////////////////////////////
1094	error_t vfs_lseek( xptr_t file_xp,
1095	uint32_t offset,
1096	uint32_t whence,
1097	uint32_t * new_offset )
1098	{
1099	xptr_t offset_xp;
1100	xptr_t lock_xp;
1101	xptr_t size_xp;
1102	cxy_t file_cxy;
1103	vfs_file_t * file_ptr;
1104	vfs_inode_t * inode_ptr;
1105	uint32_t new;
1106
1107	// check arguments
1108	assert( __FUNCTION__, (file_xp != XPTR_NULL) , "file_xp == XPTR_NULL" );
1109	assert( __FUNCTION__, (new_offset != NULL ) , "new_offset == NULL" );
1110
1111	// get cluster and local pointer on remote file descriptor
1112	file_cxy = GET_CXY( file_xp );
1113	file_ptr = GET_PTR( file_xp );
1114
1115	// get local pointer on remote inode
1116	inode_ptr = (vfs_inode_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
1117
1118	// build extended pointers on lock, offset and size
1119	offset_xp = XPTR( file_cxy , &file_ptr->offset );
1120	lock_xp = XPTR( file_cxy , &file_ptr->lock );
1121	size_xp = XPTR( file_cxy , &inode_ptr->size );
1122
1123	// take file descriptor lock
1124	remote_rwlock_wr_acquire( lock_xp );
1125
1126	if ( whence == SEEK_CUR ) // new = current + offset
1127	{
1128	new = hal_remote_l32( offset_xp ) + offset;
1129	}
1130	else if ( whence == SEEK_SET ) // new = offset
1131	{
1132	new = offset;
1133	}
1134	else if ( whence == SEEK_END ) // new = size + offset
1135	{
1136	new = hal_remote_l32( size_xp ) + offset;
1137	}
1138	else
1139	{
1140	printk("\n[ERROR] in %s : illegal whence value\n", __FUNCTION__ );
1141	remote_rwlock_wr_release( lock_xp );
1142	return -1;
1143	}
1144
1145	#if DEBUG_VFS_LSEEK
1146	uint32_t cycle = (uint32_t)hal_get_cycles();
1147	thread_t * this = CURRENT_THREAD;
1148	char name[CONFIG_VFS_MAX_NAME_LENGTH];
1149	vfs_inode_get_name( XPTR( file_cxy , inode_ptr ) , name );
1150	if( cycle > DEBUG_VFS_LSEEK )
1151	printk("\n[%s] thread[%x,%x] for <%s> / new offset %d / cycle %d\n",
1152	__FUNCTION__ , this->process->pid, this->trdid, name, new, cycle );
1153	#endif
1154
1155	// set new offset
1156	hal_remote_s32( offset_xp , new );
1157
1158	// release file descriptor lock
1159	remote_rwlock_wr_release( lock_xp );
1160
1161	// success
1162	*new_offset = new;
1163	return 0;
1164
1165	} // vfs_lseek()
1166
1167	////////////////////////////////////
1168	error_t vfs_close( xptr_t file_xp,
1169	uint32_t file_id )
1170	{
1171	cxy_t file_cxy; // cluster containing the file descriptor.
1172	vfs_file_t * file_ptr; // local pointer on file descriptor
1173	cxy_t owner_cxy; // process owner cluster
1174	pid_t pid; // process identifier
1175	lpid_t lpid; // process local index
1176	xptr_t root_xp; // root of xlist (processes , or dentries)
1177	xptr_t lock_xp; // lock protecting the xlist
1178	xptr_t iter_xp; // iterator on xlist
1179	mapper_t * mapper_ptr; // local pointer on associated mapper
1180	vfs_inode_t * inode_ptr; // local pointer on associated inode
1181	uint32_t size; // current file size (from inode descriptor)
1182	error_t error;
1183
1184	char name[CONFIG_VFS_MAX_NAME_LENGTH]; // file name
1185
1186	// check argument
1187	assert( __FUNCTION__, (file_xp != XPTR_NULL) , "file_xp is XPTR_NULL" );
1188
1189	thread_t * this = CURRENT_THREAD;
1190	process_t * process = this->process;
1191	cluster_t * cluster = LOCAL_CLUSTER;
1192
1193	// get file name
1194	vfs_file_get_name( file_xp , name );
1195
1196	#if DEBUG_VFS_CLOSE
1197	uint32_t cycle = (uint32_t)hal_get_cycles();
1198	if( DEBUG_VFS_CLOSE < cycle )
1199	printk("\n[%s] thread[%x,%x] enter for <%s> / cycle %d\n",
1200	__FUNCTION__, process->pid, this->trdid, name, cycle );
1201	#endif
1202
1203	// get cluster and local pointer on remote file descriptor
1204	file_cxy = GET_CXY( file_xp );
1205	file_ptr = GET_PTR( file_xp );
1206
1207	//////// 1) update all dirty pages from mapper to device
1208
1209	// get local pointer on mapper associated to file
1210	mapper_ptr = hal_remote_lpt( XPTR( file_cxy , &file_ptr->mapper ) );
1211
1212	// copy all dirty pages from mapper to device
1213	error = mapper_sync( XPTR( file_cxy , mapper_ptr ) );
1214
1215	if( error )
1216	{
1217	printk("\n[ERROR] in %s : cannot synchronise dirty pages for <%s>\n",
1218	__FUNCTION__, name );
1219	return -1;
1220	}
1221
1222	#if DEBUG_VFS_CLOSE
1223	if( DEBUG_VFS_CLOSE < cycle )
1224	printk("\n[%s] thread[%x,%x] synchronised mapper of <%s> to device\n",
1225	__FUNCTION__, process->pid, this->trdid, name );
1226	#endif
1227
1228	//////// 2) update file size in all parent directory mapper(s) and update device
1229
1230	// get local pointer on remote inode
1231	inode_ptr = hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
1232
1233	// get file size from remote inode
1234	size = hal_remote_l32( XPTR( file_cxy , &inode_ptr->size ) );
1235
1236	// get root of list of parents dentry
1237	root_xp = XPTR( file_cxy , &inode_ptr->parents );
1238
1239	// loop on all parents
1240	XLIST_FOREACH( root_xp , iter_xp )
1241	{
1242	// get pointers on parent directory dentry
1243	xptr_t parent_dentry_xp = XLIST_ELEMENT( iter_xp , vfs_dentry_t , parents );
1244	cxy_t parent_cxy = GET_CXY( parent_dentry_xp );
1245	vfs_dentry_t * parent_dentry_ptr = GET_PTR( parent_dentry_xp );
1246
1247	// get local pointer on parent directory inode
1248	vfs_inode_t * parent_inode_ptr = hal_remote_lpt( XPTR( parent_cxy,
1249	&parent_dentry_ptr->parent ) );
1250
1251	// get local pointer on parent directory mapper
1252	mapper_t * parent_mapper_ptr = hal_remote_lpt( XPTR( parent_cxy,
1253	&parent_inode_ptr->mapper ) );
1254
1255	// update dentry size in parent directory mapper
1256	error = vfs_fs_update_dentry( XPTR( parent_cxy , parent_inode_ptr ),
1257	parent_dentry_ptr );
1258
1259	if( error )
1260	{
1261	printk("\n[ERROR] in %s : cannot update size in parent\n",
1262	__FUNCTION__ );
1263	return -1;
1264	}
1265
1266	#if DEBUG_VFS_CLOSE
1267	char parent_name[CONFIG_VFS_MAX_NAME_LENGTH];
1268	vfs_inode_get_name( XPTR( parent_cxy , parent_inode_ptr ) , parent_name );
1269	if( DEBUG_VFS_CLOSE < cycle )
1270	printk("\n[%s] thread[%x,%x] updated <%s> in <%s> / size = %d bytes\n",
1271	__FUNCTION__, process->pid, this->trdid, name, parent_name, size );
1272	#endif
1273
1274	// copy all dirty pages from parent mapper to device
1275	error = mapper_sync( XPTR( parent_cxy , parent_mapper_ptr ) );
1276
1277	if( error )
1278	{
1279	printk("\n[ERROR] in %s : cannot synchronise parent mapper to device\n",
1280	__FUNCTION__ );
1281	return -1;
1282	}
1283
1284	#if DEBUG_VFS_CLOSE
1285	if( DEBUG_VFS_CLOSE < cycle )
1286	printk("\n[%s] thread[%x,%x] synchonized mapper of parent <%s> to device\n",
1287	__FUNCTION__, process->pid, this->trdid, parent_name );
1288	#endif
1289
1290	}
1291
1292	//////// 3) loop on the process copies to reset all fd_array[file_id] entries
1293
1294	// get owner process cluster and lpid
1295	pid = process->pid;
1296	owner_cxy = CXY_FROM_PID( pid );
1297	lpid = LPID_FROM_PID( pid );
1298
1299	// get extended pointers on copies root and lock
1300	root_xp = XPTR( owner_cxy , &cluster->pmgr.copies_root[lpid] );
1301	lock_xp = XPTR( owner_cxy , &cluster->pmgr.copies_lock[lpid] );
1302
1303	// take the lock protecting the list of copies
1304	remote_queuelock_acquire( lock_xp );
1305
1306	XLIST_FOREACH( root_xp , iter_xp )
1307	{
1308	xptr_t process_xp = XLIST_ELEMENT( iter_xp , process_t , copies_list );
1309	cxy_t process_cxy = GET_CXY( process_xp );
1310	process_t * process_ptr = GET_PTR( process_xp );
1311
1312	xptr_t entry_xp = XPTR( process_cxy , &process_ptr->fd_array.array[file_id] );
1313	hal_remote_s64( entry_xp , XPTR_NULL );
1314	hal_fence();
1315	}
1316
1317	// release the lock protecting the list of copies
1318	remote_queuelock_release( lock_xp );
1319
1320	#if DEBUG_VFS_CLOSE
1321	if( DEBUG_VFS_CLOSE < cycle )
1322	printk("\n[%s] thread[%x,%x] reset all fd-array copies for <%s>\n",
1323	__FUNCTION__, process->pid, this->trdid, name );
1324	#endif
1325
1326	//////// 4) release memory allocated to file descriptor in remote cluster
1327
1328	vfs_file_destroy( file_xp );
1329
1330	#if DEBUG_VFS_CLOSE
1331	cycle = (uint32_t)hal_get_cycles();
1332	if( DEBUG_VFS_CLOSE < cycle )
1333	printk("\n[%s] thread[%x,%x] exit / closed <%s> in process %x / cycle %d\n",
1334	__FUNCTION__, process->pid, this->trdid, name, process->pid, cycle );
1335	#endif
1336
1337	return 0;
1338
1339	} // end vfs_close()
1340
1341	////////////////////////////////////
1342	error_t vfs_mkdir( xptr_t root_xp,
1343	char * path,
1344	uint32_t rights )
1345	{
1346	error_t error;
1347	xptr_t vfs_root_xp; // extended pointer on VFS root inode
1348	vfs_inode_t * vfs_root_ptr; // local pointer on VFS root inode
1349	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
1350	xptr_t lock_xp; // extended pointer on lock protecting Inode Tree
1351	xptr_t inode_xp; // extended pointer on new directory inode
1352	vfs_inode_t * inode_ptr; // local pointer on new directory inode
1353	cxy_t inode_cxy; // new directory inode cluster identifier
1354	xptr_t dentry_xp; // extended pointer on new dentry
1355	vfs_dentry_t * dentry_ptr; // new dentry local pointer
1356	xptr_t parent_xp; // extended pointer on parent inode
1357	vfs_inode_t * parent_ptr; // local pointer on parent inode
1358	cxy_t parent_cxy; // parent inode cluster identifier
1359	vfs_ctx_t * parent_ctx_ptr; // local pointer on parent inode context
1360	uint32_t parent_fs_type; // parent inode file system type
1361
1362	xptr_t parents_root_xp; // extended pointer on parents field in inode (root)
1363	xptr_t parents_entry_xp; // extended pointer on parents field in dentry
1364	xptr_t children_xhtab_xp; // extended pointer on children field in inode (root)
1365	xptr_t children_entry_xp; // extended pointer on children field in dentry
1366
1367	char last_name[CONFIG_VFS_MAX_NAME_LENGTH];
1368
1369	thread_t * this = CURRENT_THREAD;
1370	process_t * process = this->process;
1371
1372	#if DEBUG_VFS_MKDIR
1373	char root_name[CONFIG_VFS_MAX_NAME_LENGTH];
1374	vfs_inode_get_name( root_xp , root_name );
1375	uint32_t cycle = (uint32_t)hal_get_cycles();
1376	if( DEBUG_VFS_MKDIR < cycle )
1377	printk("\n[%s] thread[%x,%x] enter / root <%s> / path <%s> / cycle %d\n",
1378	__FUNCTION__, process->pid, this->trdid, root_name, path, cycle );
1379	#endif
1380
1381	// build extended pointer on lock protecting Inode-Tree (in VFS root inode)
1382	vfs_root_xp = process->vfs_root_xp;
1383	vfs_root_ptr = GET_PTR( vfs_root_xp );
1384	vfs_root_cxy = GET_CXY( vfs_root_xp );
1385	lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
1386
1387	// take the lock protecting Inode Tree in write mode
1388	remote_rwlock_wr_acquire( lock_xp );
1389
1390	// 1. get pointers on parent inode
1391	error = vfs_lookup( root_xp,
1392	path,
1393	VFS_LOOKUP_DIR \| VFS_LOOKUP_PARENT,
1394	&parent_xp,
1395	last_name );
1396	if( error )
1397	{
1398	remote_rwlock_wr_release( lock_xp );
1399	printk("\n[ERROR] in %s : cannot get parent inode for <%s>\n",
1400	__FUNCTION__, path );
1401	return -1;
1402	}
1403
1404	// get parent inode cluster and local pointer
1405	parent_cxy = GET_CXY( parent_xp );
1406	parent_ptr = GET_PTR( parent_xp );
1407
1408	#if( DEBUG_VFS_MKDIR & 1 )
1409	if( DEBUG_VFS_MKDIR < cycle )
1410	printk("\n[%s] thread[%x,%x] get parent inode (%x,%x) for <%s>\n",
1411	__FUNCTION__, process->pid, this->trdid, parent_cxy, parent_ptr, path );
1412	#endif
1413
1414	// get parent inode context, and FS type
1415	parent_ctx_ptr = hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->ctx ) );
1416	parent_fs_type = hal_remote_l32( XPTR( parent_cxy , &parent_ctx_ptr->type ) );
1417
1418	// 2. create one new dentry in parent cluster
1419	error = vfs_dentry_create( parent_cxy,
1420	parent_fs_type,
1421	last_name,
1422	&dentry_xp );
1423	if( error )
1424	{
1425	remote_rwlock_wr_release( lock_xp );
1426	printk("\n[ERROR] in %s : cannot create new dentry in cluster %x for <%s>\n",
1427	__FUNCTION__, parent_cxy, path );
1428	return -1;
1429	}
1430
1431	// get local pointer on dentry
1432	dentry_ptr = GET_PTR( dentry_xp );
1433
1434	#if( DEBUG_VFS_MKDIR & 1 )
1435	if( DEBUG_VFS_MKDIR < cycle )
1436	printk("\n[%s] thread[%x,%x] created new dentry (%x,%x) for <%s>\n",
1437	__FUNCTION__, process->pid, this->trdid, parent_cxy, dentry_ptr, path );
1438	#endif
1439
1440	// 3. create new directory inode
1441	// TODO : define attr / uid / gid
1442	uint32_t attr = 0;
1443	uint32_t uid = 0;
1444	uint32_t gid = 0;
1445
1446	// select a target cluster for new inode
1447	inode_cxy = cluster_random_select();
1448
1449	// create inode
1450	error = vfs_inode_create( inode_cxy,
1451	parent_fs_type,
1452	attr,
1453	rights,
1454	uid,
1455	gid,
1456	&inode_xp );
1457	if( error )
1458	{
1459	remote_rwlock_wr_release( lock_xp );
1460	printk("\n[ERROR] in %s : cannot create new inode in cluster %x for <%s>\n",
1461	__FUNCTION__ , inode_cxy , path );
1462	vfs_dentry_destroy( dentry_xp );
1463	return -1;
1464	}
1465
1466	// get new inode local pointer
1467	inode_ptr = GET_PTR( inode_xp );
1468
1469	// update inode "type" field
1470	hal_remote_s32( XPTR( inode_cxy , &inode_ptr->type ) , FILE_TYPE_DIR );
1471
1472	#if(DEBUG_VFS_MKDIR & 1)
1473	if( DEBUG_VFS_MKDIR < cycle )
1474	printk("\n[%s] thread[%x,%x] created new inode (%x,%x) for <%s>\n",
1475	__FUNCTION__ , process->pid, this->trdid, inode_cxy, inode_ptr, path );
1476	#endif
1477
1478	// 4. register dentry in new inode list of parents
1479	parents_root_xp = XPTR( inode_cxy , &inode_ptr->parents );
1480	parents_entry_xp = XPTR( parent_cxy , &dentry_ptr->parents );
1481	xlist_add_first( parents_root_xp , parents_entry_xp );
1482	hal_remote_atomic_add( XPTR( inode_cxy , &inode_ptr->links ) , 1 );
1483
1484	// 5. register dentry in parent inode
1485	children_xhtab_xp = XPTR( parent_cxy , &parent_ptr->children );
1486	children_entry_xp = XPTR( parent_cxy , &dentry_ptr->children );
1487	xhtab_insert( children_xhtab_xp , last_name , children_entry_xp );
1488
1489	// 6. update "parent" and "child_xp" fields in dentry
1490	hal_remote_s64( XPTR( parent_cxy , &dentry_ptr->child_xp ) , inode_xp );
1491	hal_remote_spt( XPTR( parent_cxy , &dentry_ptr->parent ) , parent_ptr );
1492
1493	#if(DEBUG_VFS_MKDIR & 1)
1494	if( DEBUG_VFS_MKDIR < cycle )
1495	printk("\n[%s] thread[%x,%x] updated Inode Tree for <%s>\n",
1496	__FUNCTION__, process->pid, this->trdid, path );
1497	#endif
1498
1499	// 7. create the two special dentries <.> and <..> in new directory
1500	// both the new directory mapper, and the Inode Tree are updated
1501	error = vfs_add_special_dentries( inode_xp,
1502	parent_xp );
1503
1504	if( error )
1505	{
1506	remote_rwlock_wr_release( lock_xp );
1507	printk("\n[ERROR] in %s : cannot create new inode in cluster %x for <%s>\n",
1508	__FUNCTION__ , inode_cxy , path );
1509	vfs_dentry_destroy( dentry_xp );
1510	return -1;
1511	}
1512
1513	// release the lock protecting Inode Tree
1514	remote_rwlock_wr_release( lock_xp );
1515
1516	// 8. update parent directory mapper
1517	// and synchronize the parent directory on IOC device
1518	error = vfs_fs_add_dentry( parent_xp,
1519	dentry_ptr );
1520	if( error )
1521	{
1522	printk("\n[ERROR] in %s : cannot update parent directory for <%s>\n",
1523	__FUNCTION__, path );
1524	return -1;
1525	}
1526
1527	#if(DEBUG_VFS_MKDIR & 1)
1528	if( DEBUG_VFS_MKDIR < cycle )
1529	printk("\n[%s] thread[%x,%x] updated parent dir (mapper and IOC) for <%s>\n",
1530	__FUNCTION__, process->pid, this->trdid, path );
1531	#endif
1532
1533	return 0;
1534
1535	} // end vfs_mkdir()
1536
1537	///////////////////////////////////////
1538	error_t vfs_link( xptr_t old_root_xp,
1539	char * old_path,
1540	xptr_t new_root_xp,
1541	char * new_path )
1542	{
1543	error_t error;
1544	xptr_t vfs_root_xp; // extended pointer on VFS root inode
1545	vfs_inode_t * vfs_root_ptr; // local pointer on VFS root inode
1546	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
1547	xptr_t lock_xp; // extended pointer on lock protecting Inode Tree
1548	xptr_t inode_xp; // extended pointer on target inode
1549	vfs_inode_t * inode_ptr; // local pointer on target inode
1550	cxy_t inode_cxy; // target inode cluster identifier
1551	uint32_t inode_type; // target inode type
1552	vfs_ctx_t * inode_ctx_ptr; // local pointer on target inode context
1553	uint32_t inode_fs_type; // target inode file system type
1554	xptr_t dentry_xp; // extended pointer on new dentry
1555	vfs_dentry_t * dentry_ptr; // target dentry local pointer
1556	xptr_t new_parent_xp; // extended pointer on new parent inode
1557	vfs_inode_t * new_parent_ptr; // local pointer on new parent inode
1558	cxy_t new_parent_cxy; // new parent inode cluster identifier
1559
1560	xptr_t parents_root_xp; // extended pointer on parents field in inode (root)
1561	xptr_t parents_entry_xp; // extended pointer on parents field in dentry
1562	xptr_t children_xhtab_xp; // extended pointer on children field in inode (root)
1563	xptr_t children_entry_xp; // extended pointer on children field in dentry
1564
1565	char new_name[CONFIG_VFS_MAX_NAME_LENGTH];
1566
1567	thread_t * this = CURRENT_THREAD;
1568	process_t * process = this->process;
1569
1570	#if DEBUG_VFS_LINK
1571	char old_root_name[CONFIG_VFS_MAX_NAME_LENGTH];
1572	char new_root_name[CONFIG_VFS_MAX_NAME_LENGTH];
1573	vfs_inode_get_name( old_root_xp , old_root_name );
1574	vfs_inode_get_name( new_root_xp , new_root_name );
1575	uint32_t cycle = (uint32_t)hal_get_cycles();
1576	if( DEBUG_VFS_LINK < cycle )
1577	printk("\n[%s] thread[%x,%x] enter / old_root <%s> / old_path <%s> / "
1578	"new_root <%s> / new_path <%s> / cycle %d\n",
1579	__FUNCTION__, process->pid, this->trdid,
1580	old_root_name, old_path, new_root_name, new_path, cycle );
1581	#endif
1582
1583	// build extended pointer on lock protecting Inode Tree (in VFS root inode)
1584	vfs_root_xp = process->vfs_root_xp;
1585	vfs_root_ptr = GET_PTR( vfs_root_xp );
1586	vfs_root_cxy = GET_CXY( vfs_root_xp );
1587	lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
1588
1589	// take the lock protecting Inode Tree in write mode
1590	remote_rwlock_wr_acquire( lock_xp );
1591
1592	// get extended pointer on target inode
1593	error = vfs_lookup( old_root_xp,
1594	old_path,
1595	0,
1596	&inode_xp,
1597	NULL );
1598	if( error )
1599	{
1600	remote_rwlock_wr_release( lock_xp );
1601	printk("\n[ERROR] in %s : cannot get target inode for <%s>\n",
1602	__FUNCTION__, old_path );
1603	return -1;
1604	}
1605
1606	#if( DEBUG_VFS_LINK & 1 )
1607	if( DEBUG_VFS_LINK < cycle )
1608	printk("\n[%s] thread[%x,%x] get child inode (%x,%x) for <%s>\n",
1609	__FUNCTION__, process->pid, this->trdid,
1610	GET_CXY(inode_xp), GET_PTR(inode_xp), old_path, cycle );
1611	#endif
1612
1613	// get extended pointer on parent inode in new path
1614	error = vfs_lookup( new_root_xp,
1615	new_path,
1616	VFS_LOOKUP_PARENT,
1617	&new_parent_xp,
1618	new_name );
1619	if( error )
1620	{
1621	remote_rwlock_wr_release( lock_xp );
1622	printk("\n[ERROR] in %s : cannot get parent inode for <%s>\n",
1623	__FUNCTION__, new_path );
1624	return -1;
1625	}
1626
1627	#if( DEBUG_VFS_LINK & 1 )
1628	if( DEBUG_VFS_LINK < cycle )
1629	printk("\n[%s] thread[%x,%x] get parent inode (%x,%x) for <%s>\n",
1630	__FUNCTION__, process->pid, this->trdid,
1631	GET_CXY(new_parent_xp), GET_PTR(new_parent_xp), new_path );
1632	#endif
1633
1634	// get target inode cluster and local pointer
1635	inode_cxy = GET_CXY( inode_xp );
1636	inode_ptr = GET_PTR( inode_xp );
1637
1638	// get target inode type, context, and FS type
1639	inode_type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
1640	inode_ctx_ptr = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->ctx ) );
1641	inode_fs_type = hal_remote_l32( XPTR( inode_cxy , &inode_ctx_ptr->type ) );
1642
1643	// get new parent inode cluster an local pointer
1644	new_parent_ptr = GET_PTR( new_parent_xp );
1645	new_parent_cxy = GET_CXY( new_parent_xp );
1646
1647	///////////////////////////////////////////////////////////////////////
1648	if( (inode_type == FILE_TYPE_REG) \|\| (inode_type == FILE_TYPE_DIR) )
1649	{
1650	// 1. create one new dentry
1651	error = vfs_dentry_create( new_parent_cxy,
1652	inode_fs_type,
1653	new_name,
1654	&dentry_xp );
1655	if( error )
1656	{
1657	remote_rwlock_wr_release( lock_xp );
1658	printk("\n[ERROR] in %s : cannot create new dentry for <%s>\n",
1659	__FUNCTION__, new_path );
1660	return -1;
1661	}
1662
1663	// get local pointer on dentry
1664	dentry_ptr = GET_PTR( dentry_xp );
1665
1666	// 2. register dentry in target inode
1667	parents_root_xp = XPTR( inode_cxy , &inode_ptr->parents );
1668	parents_entry_xp = XPTR( new_parent_cxy , &dentry_ptr->parents );
1669	xlist_add_first( parents_root_xp , parents_entry_xp );
1670	hal_remote_atomic_add( XPTR( inode_cxy , &inode_ptr->links ) , 1 );
1671
1672	// 3. register dentry in parent inode
1673	children_xhtab_xp = XPTR( new_parent_cxy , &new_parent_ptr->children );
1674	children_entry_xp = XPTR( new_parent_cxy , &dentry_ptr->children );
1675	xhtab_insert( children_xhtab_xp , new_name , children_entry_xp );
1676
1677	// 4. update "parent" and "child_xp" fields in dentry
1678	hal_remote_s64( XPTR( new_parent_cxy , &dentry_ptr->child_xp ) , inode_xp );
1679	hal_remote_spt( XPTR( new_parent_cxy , &dentry_ptr->parent ) , new_parent_ptr );
1680
1681	#if(DEBUG_VFS_LINK & 1)
1682	if( DEBUG_VFS_LINK < cycle )
1683	printk("\n[%s] thread[%x,%x] updated Inode Tree / old <%s> / new <%s>\n",
1684	__FUNCTION__, process->pid, this->trdid, old_path, new_path );
1685	vfs_display( new_parent_xp );
1686	#endif
1687
1688	// release the lock protecting Inode Tree
1689	remote_rwlock_wr_release( lock_xp );
1690
1691	// 5. update new parent directory mapper in Inode Tree
1692	// and synchronize the parent directory on IOC device
1693	if (new_parent_cxy == local_cxy)
1694	error = vfs_fs_add_dentry( new_parent_xp,
1695	dentry_ptr );
1696	if( error )
1697	{
1698	printk("\n[ERROR] in %s : cannot update new parent directory for <%s>\n",
1699	__FUNCTION__, new_path );
1700	return -1;
1701	}
1702
1703	#if(DEBUG_VFS_LINK & 1)
1704	if( DEBUG_VFS_LINK < cycle )
1705	printk("\n[%s] thread[%x,%x] updated new parent dir (mapper and IOC) / old <%s> / new <%s>\n",
1706	__FUNCTION__, process->pid, this->trdid, old_path, new_path );
1707	#endif
1708	return 0;
1709	}
1710	else
1711	{
1712	// release the lock protecting Inode Tree
1713	remote_rwlock_wr_release( lock_xp );
1714
1715	printk("\n[ERROR] in %s : unsupported inode type %s\n",
1716	__FUNCTION__ , vfs_inode_type_str( inode_type ) );
1717	return -1;
1718	}
1719
1720	} // end vfs_link()
1721
1722	/////////////////////////////////////
1723	error_t vfs_unlink( xptr_t root_xp,
1724	char * path )
1725	{
1726	error_t error;
1727	xptr_t vfs_root_xp; // extended pointer on VFS root inode
1728	vfs_inode_t * vfs_root_ptr; // local_pointer on VFS root inode
1729	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
1730	xptr_t lock_xp; // extended pointer on lock protecting Inode Tree
1731	xptr_t parent_xp; // extended pointer on target inode
1732	cxy_t parent_cxy; // target inode cluster identifier
1733	vfs_inode_t * parent_ptr; // target inode local pointer
1734	xptr_t inode_xp; // extended pointer on target inode
1735	cxy_t inode_cxy; // target inode cluster identifier
1736	vfs_inode_t * inode_ptr; // target inode local pointer
1737	uint32_t inode_links; // target inode links count
1738	vfs_file_type_t inode_type; // target inode type
1739	uint32_t inode_children; // target inode number of children
1740	xptr_t dentry_xp; // extended pointer on dentry to unlink
1741	vfs_dentry_t * dentry_ptr; // local pointer on dentry to unlink
1742	vfs_ctx_t * ctx_ptr; // local pointer on FS context
1743	vfs_fs_type_t fs_type; // File system type
1744
1745	char child_name[CONFIG_VFS_MAX_NAME_LENGTH]; // name of link to remove
1746	char parent_name[CONFIG_VFS_MAX_NAME_LENGTH]; // name of parent directory
1747
1748	thread_t * this = CURRENT_THREAD;
1749	process_t * process = this->process;
1750
1751	#if DEBUG_VFS_UNLINK
1752	uint32_t cycle = (uint32_t)hal_get_cycles();
1753	char root_name[CONFIG_VFS_MAX_NAME_LENGTH];
1754	vfs_inode_get_name( root_xp , root_name );
1755	if( DEBUG_VFS_UNLINK < cycle )
1756	printk("\n[%s] thread[%x,%x] : enter for root <%s> / path <%s> / cycle %d\n",
1757	__FUNCTION__, process->pid, this->trdid, root_name, path, cycle );
1758	#endif
1759
1760	// build extended pointer on lock protecting Inode Tree (in VFS root inode)
1761	vfs_root_xp = process->vfs_root_xp;
1762	vfs_root_ptr = GET_PTR( vfs_root_xp );
1763	vfs_root_cxy = GET_CXY( vfs_root_xp );
1764	lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
1765
1766	// take the lock protecting Inode Tree
1767	remote_rwlock_wr_acquire( lock_xp );
1768
1769	// get extended pointer on parent inode
1770	error = vfs_lookup( root_xp,
1771	path,
1772	VFS_LOOKUP_PARENT,
1773	&parent_xp,
1774	child_name );
1775	if( error )
1776	{
1777	remote_rwlock_wr_release( lock_xp );
1778	printk("\n[ERROR] in %s : cannot get parent inode for <%s> in <%s>\n",
1779	__FUNCTION__, child_name, path );
1780	return -1;
1781	}
1782
1783	// get parent inode name, cluster and local pointer
1784	vfs_inode_get_name( parent_xp , parent_name );
1785	parent_cxy = GET_CXY( parent_xp );
1786	parent_ptr = GET_PTR( parent_xp );
1787
1788	#if( DEBUG_VFS_UNLINK & 1 )
1789	if( DEBUG_VFS_UNLINK < cycle )
1790	printk("\n[%s] thread[%x,%x] : parent inode <%s> is (%x,%x)\n",
1791	__FUNCTION__, process->pid, this->trdid, parent_name, parent_cxy, parent_ptr );
1792	#endif
1793
1794	// build extended pointer on parent inode "children" xhtab
1795	xptr_t children_xp = XPTR( parent_cxy , &parent_ptr->children );
1796
1797	// try to get extended pointer on dentry from Inode Tree
1798	dentry_xp = xhtab_lookup( children_xp , child_name );
1799
1800	// when dentry not found in Inode Tree, try to get it from mapper
1801
1802	if( dentry_xp == XPTR_NULL ) // miss target dentry in Inode Tree
1803	{
1804
1805	#if( DEBUG_VFS_UNLINK & 1 )
1806	if( DEBUG_VFS_UNLINK < cycle )
1807	printk("\n[%s] thread[%x,%x] : inode <%s> not found => scan parent mapper <%s>\n",
1808	__FUNCTION__, process->pid, this->trdid, child_name , parent_name );
1809	#endif
1810	// get parent inode FS type
1811	ctx_ptr = hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->ctx ) );
1812	fs_type = hal_remote_l32( XPTR( parent_cxy , &ctx_ptr->type ) );
1813
1814	// select a cluster for new inode
1815	inode_cxy = cluster_random_select();
1816
1817	// speculatively insert a new child dentry/inode couple in inode tree
1818	error = vfs_add_child_in_parent( inode_cxy,
1819	fs_type,
1820	parent_xp,
1821	child_name,
1822	&dentry_xp,
1823	&inode_xp );
1824	if( error )
1825	{
1826	printk("\n[ERROR] in %s : cannot create inode <%s> in Inode Tree\n",
1827	__FUNCTION__ , child_name );
1828	return -1;
1829	}
1830
1831	// get local pointers on new dentry and new inode descriptors
1832	inode_ptr = GET_PTR( inode_xp );
1833	dentry_ptr = GET_PTR( dentry_xp );
1834
1835	// scan parent mapper to find the missing dentry, and complete
1836	// initialisation of new dentry and new inode descriptors In Inode Tree
1837	error = vfs_fs_new_dentry_from_mapper( parent_xp,
1838	dentry_ptr );
1839	if ( error )
1840	{
1841	printk("\n[ERROR] in %s : cannot get entry <%s> in parent <%s> mapper\n",
1842	__FUNCTION__ , child_name, parent_name );
1843	return -1;
1844	}
1845
1846	#if (DEBUG_VFS_UNLINK & 1)
1847	if( DEBUG_VFS_UNLINK < cycle )
1848	printk("\n[%s] thread[%x,%x] : created missing inode & dentry <%s> in cluster %x\n",
1849	__FUNCTION__, process->pid, this->trdid, child_name, inode_cxy );
1850	#endif
1851
1852	}
1853	else // found target dentry in Inode Tree
1854	{
1855	dentry_ptr = GET_PTR( dentry_xp );
1856
1857	// get pointer on target inode from dentry
1858	inode_xp = hal_remote_l64( XPTR( parent_cxy , &dentry_ptr->child_xp ) );
1859	inode_cxy = GET_CXY( inode_xp );
1860	inode_ptr = GET_PTR( inode_xp );
1861	}
1862
1863	// At this point the Inode Tree contains the target dentry and child inode
1864	// we can safely remove this dentry from both the parent mapper, and the Inode Tree.
1865
1866	#if( DEBUG_VFS_UNLINK & 1 )
1867	if( DEBUG_VFS_UNLINK < cycle )
1868	printk("\n[%s] thread[%x,%x] : dentry (%x,%x) / inode (%x,%x)\n",
1869	__FUNCTION__, process->pid, this->trdid, parent_cxy, dentry_ptr, inode_cxy, inode_ptr );
1870	#endif
1871
1872	// get target inode "type" and "links"
1873	inode_type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
1874	inode_links = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->links ) );
1875
1876	///////////////////////////////////////////////////////////////////////
1877	if( (inode_type == FILE_TYPE_REG) \|\| (inode_type == FILE_TYPE_DIR) )
1878	{
1879
1880	#if( DEBUG_VFS_UNLINK & 1 )
1881	if( DEBUG_VFS_UNLINK < cycle )
1882	printk("\n[%s] thread[%x,%x] : unlink inode <%s> / type %s / %d links\n",
1883	__FUNCTION__, process->pid, this->trdid, child_name,
1884	vfs_inode_type_str(inode_type), inode_links );
1885	#endif
1886	// 1. Release space allocated to inode on IOC device
1887	// and synchronize the FAT on IOC device if last link.
1888	if( inode_links == 1 )
1889	{
1890	// build extended pointer on target inode "children" number
1891	xptr_t inode_children_xp = XPTR( inode_cxy , &inode_ptr->children.items );
1892
1893	// get target inode number of children
1894	inode_children = hal_remote_l32( inode_children_xp );
1895
1896	// check no children
1897	if( inode_children != 0 )
1898	{
1899	remote_rwlock_wr_release( lock_xp );
1900	printk("\n[ERROR] in %s : cannot remove <%s> inode that has children\n",
1901	__FUNCTION__, path );
1902	return -1;
1903	}
1904
1905	// release space on IOC device
1906	error = vfs_fs_release_inode( inode_xp );
1907
1908	if( error )
1909	{
1910	remote_rwlock_wr_release( lock_xp );
1911	printk("\n[ERROR] in %s : cannot update FAT mapper to remove <%s> inode\n",
1912	__FUNCTION__ , path );
1913	return -1;
1914	}
1915
1916	#if(DEBUG_VFS_UNLINK & 1)
1917	if( DEBUG_VFS_UNLINK < cycle )
1918	printk("\n[%s] thread[%x,%x] removed <%s> inode from FAT (mapper and IOC device)\n",
1919	__FUNCTION__, process->pid, this->trdid, path );
1920	#endif
1921	}
1922
1923	// 2. update parent directory mapper
1924	// and synchronize the parent directory on IOC device
1925	error = vfs_fs_remove_dentry( parent_xp,
1926	dentry_ptr );
1927	if( error )
1928	{
1929	remote_rwlock_wr_release( lock_xp );
1930	printk("\n[ERROR] in %s : cannot update dentry on device for <%s>\n",
1931	__FUNCTION__ , path );
1932	return -1;
1933	}
1934
1935	#if(DEBUG_VFS_UNLINK & 1)
1936	if( DEBUG_VFS_UNLINK < cycle )
1937	printk("\n[%s] thread[%x,%x] removed <%s> inode from parent dir (mapper and IOC device)\n",
1938	__FUNCTION__, process->pid, this->trdid, path );
1939	#endif
1940	// 3. remove dentry from Inode Tree (and associated child inode when last link)
1941	vfs_remove_child_from_parent( dentry_xp );
1942
1943	// release the lock protecting Inode Tree
1944	remote_rwlock_wr_release( lock_xp );
1945
1946	#if DEBUG_VFS_UNLINK
1947	if( DEBUG_VFS_UNLINK < cycle )
1948	printk("\n[%s] thread[%x,%x] exit / removed <%s> inode from Inode Tree / cycle %d\n",
1949	__FUNCTION__, process->pid, this->trdid, path, cycle );
1950	#endif
1951	return 0;
1952	}
1953	////////////////////////////////////////
1954	else if( inode_type == FILE_TYPE_FIFO )
1955	{
1956	// 1. destroy the associated pipe
1957	pipe_t * pipe = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->pipe ));
1958	pipe_destroy( XPTR( inode_cxy , pipe ) );
1959
1960	#if(DEBUG_VFS_UNLINK & 1)
1961	if( DEBUG_VFS_UNLINK < cycle )
1962	printk("\n[%s] thread[%x,%x] released <%s> pipe\n",
1963	__FUNCTION__, process->pid, this->trdid, path );
1964	#endif
1965
1966	// 2. remove dentry from Inode Tree (and associated child inode when last link)
1967	vfs_remove_child_from_parent( dentry_xp );
1968
1969	// release the lock protecting Inode Tree
1970	remote_rwlock_wr_release( lock_xp );
1971
1972	#if DEBUG_VFS_UNLINK
1973	if( DEBUG_VFS_UNLINK < cycle )
1974	printk("\n[%s] thread[%x,%x] exit / removed <%s> inode from Inode Tree / cycle %d\n",
1975	__FUNCTION__, process->pid, this->trdid, path, cycle );
1976	#endif
1977	return 0;
1978	}
1979	else
1980	{
1981	remote_rwlock_wr_release( lock_xp );
1982	printk("\n[ERROR] in %s : unsupported inode type %s\n",
1983	__FUNCTION__ , vfs_inode_type_str( inode_type ) );
1984	return -1;
1985	}
1986
1987	} // end vfs_unlink()
1988
1989	////////////////////////////////////////////////
1990	error_t vfs_stat( xptr_t root_inode_xp,
1991	char * path,
1992	struct stat * st )
1993	{
1994	error_t error;
1995	xptr_t inode_xp; // extended pointer on target inode
1996	vfs_inode_t * inode_ptr; // local pointer on target inode
1997	cxy_t inode_cxy; // target inode cluster identifier
1998	xptr_t vfs_root_xp; // extended pointer on VFS root inode
1999	vfs_inode_t * vfs_root_ptr; // local_pointer on VFS root inode
2000	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
2001	xptr_t lock_xp; // extended pointer on lock protecting Inode Tree
2002
2003	thread_t * this = CURRENT_THREAD;
2004	process_t * process = this->process;
2005
2006	// build extended pointer on lock protecting Inode Tree (in VFS root inode)
2007	vfs_root_xp = process->vfs_root_xp;
2008	vfs_root_ptr = GET_PTR( vfs_root_xp );
2009	vfs_root_cxy = GET_CXY( vfs_root_xp );
2010	lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
2011
2012	// get the lock protecting Inode Tree in read mode
2013	remote_rwlock_rd_acquire( lock_xp );
2014
2015	// get extended pointer on target inode
2016	error = vfs_lookup( root_inode_xp,
2017	path,
2018	0,
2019	&inode_xp,
2020	NULL );
2021
2022	// release the lock protecting Inode Tree
2023	remote_rwlock_rd_release( lock_xp );
2024
2025	if( error )
2026	{
2027	printk("\n[ERROR] in %s : cannot found inode <%s>\n",
2028	__FUNCTION__ , path );
2029	return -1;
2030	}
2031
2032	// get cluster and local pointer on inode descriptor
2033	inode_ptr = GET_PTR( inode_xp );
2034	inode_cxy = GET_CXY( inode_xp );
2035
2036	// get relevant infos from inode descriptor
2037	uint32_t inum = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->inum ) );
2038	uint32_t size = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->size ) );
2039	uint32_t uid = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->uid ) );
2040	uint32_t gid = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->gid ) );
2041	uint32_t type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
2042	uint32_t rights = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->rights ) );
2043
2044	// set stat structure fields
2045	st->st_ino = inum;
2046	st->st_gid = gid;
2047	st->st_uid = uid;
2048	st->st_size = size;
2049	st->st_mode = (type << 16) \| rights;
2050
2051	#if DEBUG_VFS_STAT
2052	uint32_t cycle = (uint32_t)hal_get_cycles();
2053	if( DEBUG_VFS_STAT < cycle )
2054	printk("\n[%s] thread[%x,%x] set stat %x for inode %x in cluster %x / cycle %d\n"
2055	" %s / inum %d / size %d\n",
2056	__FUNCTION__, process->pid, this->trdid, st, inode_ptr, inode_cxy, cycle,
2057	vfs_inode_type_str( type ), inum, size );
2058	#endif
2059
2060	return 0;
2061
2062	} // end vfs_stat()
2063
2064	////////////////////////////////////
2065	error_t vfs_chdir( xptr_t root_xp,
2066	char * path )
2067	{
2068	error_t error;
2069	xptr_t inode_xp; // extended pointer on target inode
2070	cxy_t inode_cxy; // target inode cluster identifier
2071	vfs_inode_t * inode_ptr; // target inode local pointer
2072	vfs_file_type_t inode_type; // target inode type
2073	xptr_t vfs_root_xp; // extended pointer on VFS root inode
2074	vfs_inode_t * vfs_root_ptr; // local_pointer on VFS root inode
2075	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
2076	xptr_t main_lock_xp; // extended pointer on lock protecting Inode Tree
2077	xptr_t ref_xp; // extended pointer on reference process
2078	process_t * ref_ptr; // local pointer on reference process
2079	cxy_t ref_cxy; // reference process cluster
2080	xptr_t cwd_lock_xp; // extended pointer on lock protecting CWD change
2081	xptr_t cwd_xp_xp; // extended pointer on cwd_xp in reference process
2082
2083	thread_t * this = CURRENT_THREAD;
2084	process_t * process = this->process;
2085
2086	#if DEBUG_VFS_CHDIR
2087	uint32_t cycle = (uint32_t)hal_get_cycles();
2088	if( DEBUG_VFS_CHDIR < cycle )
2089	printk("\n[%s] thread[%x,%x] enter for path <%s> / cycle %d\n",
2090	__FUNCTION__, process->pid, this->trdid, path, cycle );
2091	#endif
2092
2093	// build extended pointer on lock protecting Inode Tree (in VFS root inode)
2094	vfs_root_xp = process->vfs_root_xp;
2095	vfs_root_ptr = GET_PTR( vfs_root_xp );
2096	vfs_root_cxy = GET_CXY( vfs_root_xp );
2097	main_lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
2098
2099	// take lock protecting Inode Tree in read mode
2100	remote_rwlock_rd_acquire( main_lock_xp );
2101
2102	// get extended pointer on target inode
2103	error = vfs_lookup( root_xp,
2104	path,
2105	VFS_LOOKUP_DIR,
2106	&inode_xp,
2107	NULL );
2108
2109	// release lock protecting Inode Tree in read mode
2110	remote_rwlock_rd_release( main_lock_xp );
2111
2112	if( error )
2113	{
2114	printk("\n[ERROR] in %s : <%s> not found\n",
2115	__FUNCTION__, path );
2116	return -1;
2117	}
2118
2119	// get inode type from remote file
2120	inode_cxy = GET_CXY( inode_xp );
2121	inode_ptr = GET_PTR( inode_xp );
2122	inode_type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
2123
2124	if( inode_type != FILE_TYPE_DIR )
2125	{
2126	printk("\n[ERROR] in %s : <%s> is not a directory\n",
2127	__FUNCTION__, path );
2128	return -1;
2129	}
2130
2131	// build extended pointer on cwd_lock and cwd_xp
2132	ref_xp = process->ref_xp;
2133	ref_ptr = GET_PTR( ref_xp );
2134	ref_cxy = GET_CXY( ref_xp );
2135	cwd_lock_xp = XPTR( ref_cxy , &ref_ptr->cwd_lock );
2136	cwd_xp_xp = XPTR( ref_cxy , &ref_ptr->cwd_xp );
2137
2138	// take lock protecting CWD changes
2139	remote_busylock_acquire( cwd_lock_xp );
2140
2141	// update cwd_xp field in reference process descriptor
2142	hal_remote_s64( cwd_xp_xp , inode_xp );
2143
2144	// release lock protecting CWD changes
2145	remote_busylock_release( cwd_lock_xp );
2146
2147	#if DEBUG_VFS_CHDIR
2148	cycle = (uint32_t)hal_get_cycles();
2149	if( DEBUG_VFS_CHDIR < cycle )
2150	printk("\n[%s] thread[%x,%x] exit : inode (%x,%x) / &cwd_xp (%x,%x) / cycle %d\n",
2151	__FUNCTION__, process->pid, this->trdid, inode_cxy, inode_ptr,
2152	GET_CXY(cwd_xp_xp), GET_PTR(cwd_xp_xp), cycle );
2153	#endif
2154
2155	return 0;
2156
2157	} // end vfs_chdir()
2158
2159	///////////////////////////////////
2160	error_t vfs_chmod( xptr_t cwd_xp,
2161	char * path,
2162	uint32_t rights )
2163	{
2164	error_t error;
2165	xptr_t inode_xp; // extended pointer on target inode
2166	cxy_t inode_cxy; // inode cluster identifier
2167	vfs_inode_t * inode_ptr; // inode local pointer
2168
2169	// check lookup working mode
2170	assert( __FUNCTION__, (rights == 0), "access rights non implemented yet" );
2171
2172	// get extended pointer on target inode
2173	error = vfs_lookup( cwd_xp,
2174	path,
2175	0,
2176	&inode_xp,
2177	NULL );
2178
2179	if( error ) return error;
2180
2181	// get inode cluster and local pointer
2182	inode_cxy = GET_CXY( inode_xp );
2183	inode_ptr = GET_PTR( inode_xp );
2184
2185	// get inode type from remote inode
2186	// inode_type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
2187
2188	// TODO finalize implementation
2189
2190	assert( __FUNCTION__, false , "not implemented" );
2191
2192	// set inode rights in remote inode
2193	hal_remote_s32( XPTR( inode_cxy , &inode_ptr->rights ) , rights );
2194
2195	return 0;
2196
2197	} // end vfs_chmod()
2198
2199	/////////////////////////////////////
2200	error_t vfs_mkfifo( xptr_t root_xp,
2201	char * path,
2202	uint32_t mode )
2203	{
2204	error_t error;
2205	xptr_t parent_inode_xp; // extended pointer on parent inode in path
2206	xptr_t fifo_dentry_xp; // extended pointer on created dentry
2207	xptr_t fifo_inode_xp; // extended pointer on created inode
2208	cxy_t fifo_cxy; // selected cluster for fifo inode
2209
2210	char fifo_name[CONFIG_VFS_MAX_NAME_LENGTH];
2211
2212	thread_t * this = CURRENT_THREAD;
2213	process_t * process = this->process;
2214
2215	// build extended pointer on lock protecting Inode Tree
2216	xptr_t vfs_root_xp = process->vfs_root_xp;
2217	vfs_inode_t * vfs_root_ptr = GET_PTR( vfs_root_xp );
2218	cxy_t vfs_root_cxy = GET_CXY( vfs_root_xp );
2219	xptr_t vfs_lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
2220
2221	// take the lock protecting the Inode-Tree in write mode
2222	remote_rwlock_wr_acquire( vfs_lock_xp );
2223
2224	// 1. get extended pointer on parent inode and fifo name from vfs
2225	error = vfs_lookup( root_xp,
2226	path,
2227	VFS_LOOKUP_PARENT,
2228	&parent_inode_xp,
2229	fifo_name );
2230	if( error )
2231	{
2232	printk("\n[ERROR] in %s : cannot get parent inode for <%s> path\n",
2233	__FUNCTION__ , path );
2234	return -1;
2235	}
2236
2237	// get parent inode cluster and local pointer
2238	cxy_t parent_cxy = GET_CXY( parent_inode_xp );
2239	vfs_inode_t * parent_ptr = GET_PTR( parent_inode_xp );
2240
2241	// 2. select a cluster for new fifo inode
2242	fifo_cxy = cluster_random_select();
2243
2244	// get parent inode FS type
2245	vfs_ctx_t * ctx_ptr = hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->ctx ) );
2246	vfs_fs_type_t fs_type = hal_remote_l32( XPTR( parent_cxy , &ctx_ptr->type ) );
2247
2248	// 3. insert a new inode and dentry in Inode-Tree
2249	error = vfs_add_child_in_parent( fifo_cxy,
2250	fs_type,
2251	parent_inode_xp,
2252	fifo_name,
2253	&fifo_dentry_xp,
2254	&fifo_inode_xp );
2255
2256	// get fifo inode local pointer
2257	vfs_inode_t * fifo_inode_ptr = GET_PTR( fifo_inode_xp );
2258
2259	if( error )
2260	{
2261	printk("\n[ERROR] in %s : cannot create fifo inode for <%s> path\n",
2262	__FUNCTION__ , path );
2263	return -1;
2264	}
2265
2266	// 4. allocate memory for a pipe descriptor, for the
2267	// remote_buf_t descriptor, and for the associated data buffer
2268	pipe_t * pipe = pipe_create( fifo_cxy,
2269	CONFIG_PIPE_BUF_SIZE );
2270	if( pipe == NULL )
2271	{
2272	printk("\n[ERROR] in %s : cannot create pipe for <%s> path\n",
2273	__FUNCTION__ , path );
2274	return -1;
2275	}
2276
2277	// 5. update fifo_inode "type", "pipe", and "rights" fields
2278	hal_remote_s32( XPTR( fifo_cxy , &fifo_inode_ptr->type ) , FILE_TYPE_FIFO );
2279	hal_remote_s32( XPTR( fifo_cxy , &fifo_inode_ptr->rights ) , mode );
2280	hal_remote_spt( XPTR( fifo_cxy , &fifo_inode_ptr->pipe ) , pipe );
2281
2282	// release the lock protecting the Inode-Tree from write mode
2283	remote_rwlock_wr_release( vfs_lock_xp );
2284
2285	return 0;
2286
2287	} // end vfs_mkfifo()
2288
2289
2290
2291	//////////////////////////////////////////////////////////////////////////////////////////
2292	// Distributed Inode Tree access related functions
2293	//////////////////////////////////////////////////////////////////////////////////////////
2294
2295	//////////////////////////////////////////////////////////////////////////
2296	// This recursive function is called by the vfs_display() function.
2297	// that is supposed to take the TXT0 lock.
2298	//////////////////////////////////////////////////////////////////////////
2299	static void vfs_recursive_display( xptr_t inode_xp,
2300	xptr_t name_xp,
2301	uint32_t indent )
2302	{
2303	cxy_t inode_cxy;
2304	vfs_inode_t * inode_ptr;
2305	vfs_file_type_t inode_type;
2306	uint32_t inode_size;
2307	uint32_t inode_attr;
2308	void * inode_extd;
2309
2310	xptr_t children_xp; // extended pointer on children xhtab
2311
2312	xptr_t child_dentry_xp;
2313	cxy_t child_dentry_cxy;
2314	vfs_dentry_t * child_dentry_ptr;
2315	xptr_t child_inode_xp;
2316	xptr_t child_dentry_name_xp;
2317	mapper_t * mapper_ptr;
2318
2319	char name[CONFIG_VFS_MAX_NAME_LENGTH];
2320
2321	char * indent_str[] = { "", // level 0
2322	" ", // level 1
2323	" ", // level 2
2324	" ", // level 3
2325	" ", // level 4
2326	" ", // level 5
2327	" ", // level 6
2328	" ", // level 7
2329	" ", // level 8
2330	" ", // level 9
2331	" ", // level 10
2332	" ", // level 11
2333	" ", // level 12
2334	" ", // level 13
2335	" ", // level 14
2336	" " }; // level 15
2337
2338	assert( __FUNCTION__, (inode_xp != XPTR_NULL) , "inode_xp cannot be NULL" );
2339	assert( __FUNCTION__, (name_xp != XPTR_NULL) , "name_xp cannot be NULL" );
2340	assert( __FUNCTION__, (indent < 16) , "depth cannot be larger than 15" );
2341
2342	// get current inode cluster and local pointer
2343	inode_cxy = GET_CXY( inode_xp );
2344	inode_ptr = GET_PTR( inode_xp );
2345
2346	// get inode type, size, attr, mapper, and inum
2347	inode_type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
2348	inode_size = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->size ) );
2349	inode_attr = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->attr ) );
2350	inode_extd = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->extend ) );
2351	mapper_ptr = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
2352
2353	// make a local copy of node name
2354	hal_remote_strcpy( XPTR( local_cxy , name ) , name_xp );
2355
2356	// compute dirty
2357	// inode_dirty = ((inode_attr & INODE_ATTR_DIRTY) != 0); unused [AG] dec 2019
2358
2359	// display inode
2360	nolock_printk("%s<%s> : %s / extd %x / %d bytes / cxy %x / inode %x / mapper %x\n",
2361	indent_str[indent], name, vfs_inode_type_str( inode_type ), (uint32_t)inode_extd,
2362	inode_size, inode_cxy, inode_ptr, mapper_ptr );
2363
2364	// scan directory entries when current inode is a directory
2365	// don't scan the the "." and ".." directories to break loops
2366	if( (inode_type == FILE_TYPE_DIR) &&
2367	(strcmp( name , "." ) != 0) &&
2368	(strcmp( name , ".." ) != 0) )
2369	{
2370	// get extended pointer on directory entries xhtab
2371	children_xp = XPTR( inode_cxy , &inode_ptr->children );
2372
2373	// get xhtab lock
2374	xhtab_lock( children_xp );
2375
2376	// get first dentry from xhtab
2377	child_dentry_xp = xhtab_get_first( children_xp );
2378
2379	while( child_dentry_xp != XPTR_NULL )
2380	{
2381	// get dentry cluster and local pointer
2382	child_dentry_cxy = GET_CXY( child_dentry_xp );
2383	child_dentry_ptr = GET_PTR( child_dentry_xp );
2384
2385	// get extended pointer on child inode
2386	child_inode_xp = hal_remote_l64( XPTR( child_dentry_cxy,
2387	&child_dentry_ptr->child_xp ) );
2388
2389	// get extended pointer on dentry name
2390	child_dentry_name_xp = XPTR( child_dentry_cxy , &child_dentry_ptr->name );
2391
2392	// recursive call on inode display
2393	vfs_recursive_display( child_inode_xp,
2394	child_dentry_name_xp,
2395	indent+1 );
2396
2397	// get next dentry
2398	child_dentry_xp = xhtab_get_next( children_xp );
2399	}
2400
2401	// release xhtab lock
2402	xhtab_unlock( children_xp );
2403	}
2404	} // end vfs_recursive_display()
2405
2406	///////////////////////////////////
2407	void vfs_display( xptr_t inode_xp )
2408	{
2409	xptr_t name_xp;
2410	xptr_t dentry_xp;
2411	cxy_t dentry_cxy;
2412	vfs_dentry_t * dentry_ptr;
2413	xptr_t parents_root_xp; // root of parent dentries xlist
2414
2415	// get target inode cluster and local pointer
2416	cxy_t inode_cxy = GET_CXY( inode_xp );
2417	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
2418
2419	// build extended pointer on parents dentries root
2420	parents_root_xp = XPTR( inode_cxy , &inode_ptr->parents );
2421
2422	// check VFS root
2423	if( xlist_is_empty( parents_root_xp ) ) // inode is the VFS root
2424	{
2425	// build extended pointer on root name
2426	name_xp = XPTR( local_cxy , "/" );
2427	}
2428	else
2429	{
2430	// get first parent dentry cluster and pointers
2431	dentry_xp = XLIST_FIRST( parents_root_xp , vfs_dentry_t , parents );
2432	dentry_cxy = GET_CXY( dentry_xp );
2433	dentry_ptr = GET_PTR( dentry_xp );
2434
2435	// get extended pointer on dentry name
2436	name_xp = XPTR( dentry_cxy , &dentry_ptr->name );
2437	}
2438
2439	// get pointers on TXT0 chdev
2440	xptr_t txt0_xp = chdev_dir.txt_tx[0];
2441	cxy_t txt0_cxy = GET_CXY( txt0_xp );
2442	chdev_t * txt0_ptr = GET_PTR( txt0_xp );
2443
2444	// get extended pointer on remote TXT0 chdev lock
2445	xptr_t lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
2446
2447	// get TXT0 lock in busy waiting mode
2448	remote_busylock_acquire( lock_xp );
2449
2450	// print header
2451	nolock_printk("\n***** current VFS state\n\n");
2452
2453	// call recursive function
2454	vfs_recursive_display( inode_xp , name_xp , 0 );
2455
2456	// release lock
2457	remote_busylock_release( lock_xp );
2458
2459	} // end vfs_display()
2460
2461	/*
2462	//////////////////////////////////////////////////////////////////////////////////////////
2463	// This static function is used by the vfs_lookup() function.
2464	// It takes an extended pointer on a remote inode (parent directory inode),
2465	// and check access_rights violation for the calling thread.
2466	// It can be used by any thread running in any cluster.
2467	//////////////////////////////////////////////////////////////////////////////////////////
2468	// @ inode_xp : extended pointer on inode.
2469	// @ client_uid : client thread user ID
2470	// @ client_gid : client thread group ID
2471	// @ return true if access rights are violated.
2472	//////////////////////////////////////////////////////////////////////////////////////////
2473	static bool_t vfs_access_denied( xptr_t inode_xp,
2474	uint32_t client_uid,
2475	uint32_t client_gid )
2476	{
2477	// get found inode cluster and local pointer
2478	cxy_t inode_cxy = GET_CXY( inode_xp );
2479	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
2480
2481	// get inode access mode, UID, and GID
2482	// TODO uint32_t mode = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->mode ) );
2483	uid_t uid = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->uid ) );
2484	gid_t gid = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->gid ) );
2485
2486	// TODO : me must use mode
2487	if( (uid == client_uid) \|\| (gid == client_gid) ) return false;
2488	else return true;
2489	}
2490	*/
2491
2492	//////////////////////////////////////////////////////////////////////////////////////////
2493	// This static function is used by the vfs_lookup() function.
2494	// It takes an extended pointer on a remote parent directory inode, a directory
2495	// entry name, and and scan the XHTAB associated to the parent inode to find the
2496	// searched dentry. It does NOT modify the inode tree in case of miss.
2497	// It can be used by any thread running in any cluster.
2498	//////////////////////////////////////////////////////////////////////////////////////////
2499	// @ parent_xp : extended pointer on parent inode in remote cluster.
2500	// @ name : dentry name
2501	// @ child_xp : [out] buffer for extended pointer on child inode.
2502	// @ return true if success / return false if not found.
2503	//////////////////////////////////////////////////////////////////////////////////////////
2504	static bool_t vfs_get_child( xptr_t parent_xp,
2505	char * name,
2506	xptr_t * child_xp )
2507	{
2508	xptr_t xhtab_xp; // extended pointer on hash table for children dentries
2509	xptr_t dentry_xp; // extended pointer on children dentry
2510	cxy_t dentry_cxy;
2511	vfs_dentry_t * dentry_ptr;
2512
2513	// get parent inode cluster and local pointer
2514	cxy_t parent_cxy = GET_CXY( parent_xp );
2515	vfs_inode_t * parent_ptr = GET_PTR( parent_xp );
2516
2517	// get extended pointer on hash table of children directory entries
2518	xhtab_xp = XPTR( parent_cxy , &parent_ptr->children );
2519
2520	// get pointers on matching dentry
2521	dentry_xp = xhtab_lookup( xhtab_xp , name );
2522	dentry_cxy = GET_CXY( dentry_xp );
2523	dentry_ptr = GET_PTR( dentry_xp );
2524
2525	if( dentry_xp == XPTR_NULL )
2526	{
2527	return false;
2528	}
2529	else
2530	{
2531	*child_xp = (xptr_t)hal_remote_l64( XPTR( dentry_cxy , &dentry_ptr->child_xp ) );
2532	return true;
2533	}
2534
2535	} // end vfs_get_child()
2536
2537	//////////////////////////////////////////////////////////////////////////////////////////
2538	// This static function is used by the vfs_lookup() function.
2539	// It takes the <current> pointer on a buffer containing a complete pathname, and return
2540	// in the <name> buffer, allocated by the caller, a single name in the path.
2541	// It return also in the <next> pointer the next character to analyse in the path.
2542	// Finally it returns a <last> boolean, that is true when the returned <name> is the
2543	// last name in the path. The names are supposed to be separated by one or several '/'
2544	// characters, that are not written in the <name> buffer.
2545	//
2546	// WARNING: the leading characters '/' in the path are skiped before analysis.
2547	// The path "/" identifies the VFS root, and is therefore anaysed as an empty
2548	// string. This empty string is dignaled by the (-1) return value.
2549	//////////////////////////////////////////////////////////////////////////////////////////
2550	// @ current : pointer on first character to analyse in buffer containing the path.
2551	// @ name : [out] pointer on buffer allocated by the caller for the returned name.
2552	// @ next : [out] pointer on next character to analyse in buffer containing the path.
2553	// @ last : [out] true if the returned name is the last (NUL character found).
2554	// @ return 0 if success / return -1 if string empty (first chracter is NUL).
2555	//////////////////////////////////////////////////////////////////////////////////////////
2556	static error_t vfs_get_name_from_path( char * current,
2557	char * name,
2558	char ** next,
2559	bool_t * last )
2560	{
2561	char * ptr = current;
2562
2563	// skip leading '/' characters
2564	while( *ptr == '/' ) ptr++;
2565
2566	// signal empty string
2567	if( *ptr == 0 )
2568	{
2569	*last = true;
2570	return -1;
2571	}
2572
2573	// copy all characters in name until NUL or '/'
2574	while( (ptr != 0) && (ptr !='/') ) (name++) = (ptr++);
2575
2576	// set NUL terminating character in name buffer
2577	*(name++) = 0;
2578
2579	// return last an next
2580	if( *ptr == 0 ) // last found character is NUL => last name in path
2581	{
2582	*last = true;
2583	}
2584	else // last found character is '/' => skip it
2585	{
2586	*last = false;
2587	*next = ptr + 1;
2588	}
2589
2590	return 0;
2591
2592	} // end vfs_get name_from_path()
2593
2594	///////////////////////////////////////////////
2595	error_t vfs_lookup( xptr_t root_xp,
2596	char * pathname,
2597	uint32_t lookup_mode,
2598	xptr_t * inode_xp,
2599	char * last_name )
2600	{
2601	char name[CONFIG_VFS_MAX_NAME_LENGTH]; // one name in path
2602
2603	xptr_t parent_xp; // extended pointer on parent inode
2604	cxy_t parent_cxy; // cluster for parent inode
2605	vfs_inode_t * parent_ptr; // local pointer on parent inode
2606	xptr_t dentry_xp; // extended pointer on dentry
2607	vfs_dentry_t * dentry_ptr; // local pointer on dentry
2608	xptr_t child_xp; // extended pointer on child inode
2609	cxy_t child_cxy; // cluster for child inode
2610	vfs_inode_t * child_ptr; // local pointer on child inode
2611	vfs_fs_type_t fs_type; // File system type
2612	vfs_ctx_t * ctx_ptr; // local pointer on FS context
2613	char * current; // current pointer on path
2614	char * next; // next value for current pointer
2615	bool_t last; // true when the name is the last in path
2616	bool_t found; // true when a child has been found
2617	bool_t create; // searched inode must be created if not found
2618	bool_t excl; // searched inode must not exist
2619	bool_t parent; // searched inode is the parent
2620	thread_t * this; // pointer on calling thread descriptor
2621	process_t * process; // pointer on calling process descriptor
2622	error_t error;
2623
2624	this = CURRENT_THREAD;
2625	process = this->process;
2626
2627	// check pathname / root_xp consistency
2628	assert( __FUNCTION__, ((pathname[0] != '/') \|\| (root_xp == process->vfs_root_xp)),
2629	"root inode must be VFS root for path <%s>", pathname );
2630
2631	#if DEBUG_VFS_LOOKUP \|\| DEBUG_VFS_ERROR
2632	uint32_t cycle = (uint32_t)hal_get_cycles();
2633	#endif
2634
2635	#if DEBUG_VFS_LOOKUP
2636	char root_name[CONFIG_VFS_MAX_NAME_LENGTH];
2637	vfs_inode_get_name( root_xp , root_name );
2638	if( DEBUG_VFS_LOOKUP < cycle )
2639	printk("\n[%s] thread[%x,%x] enter / root <%s> / path <%s> / mode %x / cycle %d\n",
2640	__FUNCTION__, process->pid, this->trdid, root_name, pathname, lookup_mode, cycle );
2641	#endif
2642
2643	#if ( DEBUG_VFS_LOOKUP & 1 )
2644	if( DEBUG_VFS_LOOKUP < cycle )
2645	vfs_display( root_xp );
2646	#endif
2647
2648	// compute lookup flags
2649	create = (lookup_mode & VFS_LOOKUP_CREATE) == VFS_LOOKUP_CREATE;
2650	excl = (lookup_mode & VFS_LOOKUP_EXCL) == VFS_LOOKUP_EXCL;
2651	parent = (lookup_mode & VFS_LOOKUP_PARENT) == VFS_LOOKUP_PARENT;
2652
2653	// initialise loop variables
2654	parent_xp = root_xp;
2655	current = pathname;
2656	next = NULL;
2657	last = false;
2658	child_xp = XPTR_NULL;
2659	child_cxy = 0;
2660	child_ptr = NULL;
2661
2662	// loop on nodes in pathname
2663	// load from device if one node in path not found in Inode Tree
2664	// exit loop when last name found (i.e. last == true)
2665	while( 1 )
2666	{
2667	// get parent inode cluster and local pointer
2668	parent_cxy = GET_CXY( parent_xp );
2669	parent_ptr = GET_PTR( parent_xp );
2670
2671	// get one "name" from path, and "last" flag
2672	error = vfs_get_name_from_path( current , name , &next , &last );
2673
2674	// handle VFS root case
2675	if ( error )
2676	{
2677
2678	#if DEBUG_VFS_LOOKUP
2679	cycle = (uint32_t)hal_get_cycles();
2680	if( DEBUG_VFS_LOOKUP < cycle )
2681	printk("\n[%s] thread[%x,%x] exit / parent inode(%x,%x) / <%s> / cycle %d\n",
2682	__FUNCTION__ , process->pid, this->trdid, parent_cxy, parent_ptr, pathname, cycle );
2683	#endif
2684	*inode_xp = process->vfs_root_xp;
2685	break;
2686	}
2687
2688	#if (DEBUG_VFS_LOOKUP & 1)
2689	if( DEBUG_VFS_LOOKUP < cycle )
2690	printk("\n[%s] thread[%x,%x] search <%s> in <%s> / last = %d\n",
2691	__FUNCTION__, process->pid, this->trdid, name, pathname, last );
2692	#endif
2693
2694	// search the child dentry matching name in parent inode XHTAB
2695	found = vfs_get_child( parent_xp,
2696	name,
2697	&child_xp );
2698
2699	if( found == false ) // child not found in Inode Tree
2700	{
2701	// when a inode is not found in the Inode Tree:
2702	// - if (last and parent) the Inode Tree is not modified
2703	// - else we speculatively introduce a new (dentry/inode) in inode tree,
2704	// and scan the parent directory mapper to initialise it.
2705	// . if it is not found in the parent mapper:
2706	// - if(last and create), a brand new file or directory is created
2707	// - else, an error is reported
2708	// . if it is found in parent mapper:
2709	// - if( last and excl ), an error is reported
2710	// - else the new child (inode & dentry) is initialised in Inode Tree
2711	// - if the child is a directory, the child mapper is loaded from device
2712
2713	if( last && parent ) // does nothing
2714	{
2715
2716	#if (DEBUG_VFS_LOOKUP & 1)
2717	if( DEBUG_VFS_LOOKUP < cycle )
2718	printk("\n[%s] thread[%x,%x] child not found but only parent requested in <%s>\n",
2719	__FUNCTION__, process->pid, this->trdid, pathname );
2720	#endif
2721	}
2722	else // try to get it from parent mapper
2723	{
2724
2725	#if (DEBUG_VFS_LOOKUP & 1)
2726	if( DEBUG_VFS_LOOKUP < cycle )
2727	printk("\n[%s] thread[%x,%x] miss <%s> inode in Inode Tree => build from parent mapper\n",
2728	__FUNCTION__, process->pid, this->trdid, name );
2729	#endif
2730	// get parent inode FS type
2731	ctx_ptr = hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->ctx ) );
2732	fs_type = hal_remote_l32( XPTR( parent_cxy , &ctx_ptr->type ) );
2733
2734	// select a cluster for new inode
2735	child_cxy = cluster_random_select();
2736
2737	// insert a new child dentry/inode couple in inode tree
2738	error = vfs_add_child_in_parent( child_cxy,
2739	fs_type,
2740	parent_xp,
2741	name,
2742	&dentry_xp,
2743	&child_xp );
2744	if( error )
2745	{
2746
2747	#if DEBUG_VFS_ERROR
2748	if( DEBUG_VFS_ERROR < cycle )
2749	printk("\n[ERROR] in %s : thread[%x,%x] cannot create inode <%s> in path <%s>\n",
2750	__FUNCTION__ , process->pid, this->trdid, name, pathname );
2751	#endif
2752	return -1;
2753	}
2754
2755	// get child inode and dentry local pointers
2756	child_ptr = GET_PTR( child_xp );
2757	dentry_ptr = GET_PTR( dentry_xp );
2758
2759	#if (DEBUG_VFS_LOOKUP & 1)
2760	if( DEBUG_VFS_LOOKUP < cycle )
2761	printk("\n[%s] thread[%x,%x] created dentry/inode <%s> in cluster %x\n",
2762	__FUNCTION__, process->pid, this->trdid, name, child_cxy );
2763	#endif
2764	// scan parent mapper to find the missing dentry, and complete
2765	// the initialisation of dentry and child inode descriptors
2766	error = vfs_fs_new_dentry_from_mapper( parent_xp,
2767	dentry_ptr );
2768
2769	if ( error ) // an error can be fatal or non-fatal :
2770	{
2771	if ( last && create ) // add a brand new dentry in parent directory
2772	{
2773	error = vfs_fs_new_dentry_to_mapper( parent_xp,
2774	dentry_ptr );
2775	if ( error )
2776	{
2777
2778	#if DEBUG_VFS_ERROR
2779	if( DEBUG_VFS_ERROR < cycle )
2780	printk("\n[ERROR] in %s : thread[%x,%x] cannot add dentry <%s> in parent dir\n",
2781	__FUNCTION__, process->pid, this->trdid, name );
2782	#endif
2783	vfs_remove_child_from_parent( dentry_xp );
2784	return -1;
2785	}
2786
2787	#if (DEBUG_VFS_LOOKUP & 1)
2788	if( DEBUG_VFS_LOOKUP < cycle )
2789	printk("\n[%s] thread[%x,%x] child <%s> not found in parent mapper => created it\n",
2790	__FUNCTION__, process->pid, this->trdid, name );
2791	#endif
2792	}
2793	else // not last or not create => error
2794	{
2795
2796	#if DEBUG_VFS_ERROR
2797	if( DEBUG_VFS_ERROR < cycle )
2798	printk("\n[ERROR] in %s : thread[%x,%x] cannot found node <%s> in parent for <%s>\n",
2799	__FUNCTION__ , process->pid, this->trdid, name, pathname );
2800	#endif
2801	vfs_remove_child_from_parent( dentry_xp );
2802	return -1;
2803	}
2804	}
2805	else // child has been found in parent mapper
2806	{
2807	// check the excl
2808	if( last && create && excl )
2809	{
2810
2811	#if DEBUG_VFS_ERROR
2812	if( DEBUG_VFS_ERROR < cycle )
2813	printk("\n[ERROR] in %s : thread[%x,%x] found an existing node <%s> %\n",
2814	__FUNCTION__ , process->pid, this->trdid, pathname );
2815	#endif
2816	return -1;
2817	}
2818
2819	#if (DEBUG_VFS_LOOKUP & 1)
2820	if( DEBUG_VFS_LOOKUP < cycle )
2821	printk("\n[%s] thread[%x,%x] initialised inode <%s> from parent mapper\n",
2822	__FUNCTION__, process->pid, this->trdid, name );
2823	#endif
2824	// load child mapper from device if child is a directory (prefetch)
2825	uint32_t type = hal_remote_l32( XPTR( child_cxy , &child_ptr->type ) );
2826	if( type == FILE_TYPE_DIR )
2827	{
2828	error = vfs_inode_load_all_pages( child_xp );
2829
2830	if ( error )
2831	{
2832	#if DEBUG_VFS_ERROR
2833	if( DEBUG_VFS_ERROR < cycle )
2834	printk("\n[ERROR] in %s : thread[%x,%x] cannot load <%s> from device\n",
2835	__FUNCTION__ , process->pid, this->trdid, name );
2836	#endif
2837	vfs_remove_child_from_parent( dentry_xp );
2838	return -1;
2839	}
2840
2841	#if (DEBUG_VFS_LOOKUP & 1)
2842	if( DEBUG_VFS_LOOKUP < cycle )
2843	printk("\n[%s] thread[%x,%x] loaded directory mapper for <%s> from IOC\n",
2844	__FUNCTION__ , process->pid, this->trdid, name );
2845	#endif
2846	}
2847	}
2848	}
2849	}
2850	else // child found in Inode Tree
2851	{
2852	// get child inode local pointer and cluster
2853	child_ptr = GET_PTR( child_xp );
2854	child_cxy = GET_CXY( child_xp );
2855
2856	#if (DEBUG_VFS_LOOKUP & 1)
2857	if( DEBUG_VFS_LOOKUP < cycle )
2858	printk("\n[%s] thread[%x,%x] found <%s> in Inode Tree / inode (%x,%x)\n",
2859	__FUNCTION__, process->pid, this->trdid, name, child_cxy, child_ptr );
2860	#endif
2861	// check the excl flag
2862	if( last && create && excl )
2863	{
2864
2865	#if DEBUG_VFS_ERROR
2866	if( DEBUG_VFS_ERROR < cycle )
2867	printk("\n[ERROR] in %s : thread[%x,%x] found an existing node <%s>\n",
2868	__FUNCTION__ , process->pid, this->trdid, pathname );
2869	#endif
2870	return -1;
2871	}
2872	}
2873
2874	// TODO check access rights here [AG]
2875	// error = vfs_access_denied( child_xp,
2876	// client_uid,
2877	// client_gid );
2878	// if( error )
2879	// {
2880	// #if DEBUG_VFS_ERROR
2881	// if( DEBUG_VFS_ERROR < cycle )
2882	// printk("\n[ERROR] in %s : thread[%x,%x] / permission denied for <%s>\n",
2883	// __FUNCTION__ , process->pid, this->trdid , pathname );
2884	// #endif
2885	//
2886	// return -1;
2887	// }
2888
2889	// exit when last
2890	if ( last ) // last inode in path => return relevant info
2891	{
2892	if ( parent ) // return parent inode and child name
2893	{
2894
2895	#if DEBUG_VFS_LOOKUP
2896	cycle = (uint32_t)hal_get_cycles();
2897	if( DEBUG_VFS_LOOKUP < cycle )
2898	printk("\n[%s] thread[%x,%x] exit / parent inode(%x,%x) / <%s> / cycle %d\n",
2899	__FUNCTION__ , process->pid, this->trdid, parent_cxy, parent_ptr, pathname, cycle );
2900	#endif
2901	*inode_xp = parent_xp;
2902	strcpy( last_name , name );
2903	break;
2904	}
2905	else // return child inode name
2906	{
2907
2908	#if DEBUG_VFS_LOOKUP
2909	cycle = (uint32_t)hal_get_cycles();
2910	if( DEBUG_VFS_LOOKUP < cycle )
2911	printk("\n[%s] thread[%x,%x] exit / child inode (%x,%x) / <%s> / cycle %d\n",
2912	__FUNCTION__ , process->pid, this->trdid, child_cxy, child_ptr, pathname, cycle );
2913	#endif
2914	*inode_xp = child_xp;
2915	break;
2916	}
2917	}
2918	else // not the last node in path => update loop variables
2919	{
2920	parent_xp = child_xp;
2921	current = next;
2922	}
2923	} // end while loop on nodes in pathname
2924
2925	#if ( DEBUG_VFS_LOOKUP & 1 )
2926	if( DEBUG_VFS_LOOKUP < cycle )
2927	vfs_display( root_xp );
2928	#endif
2929
2930	return 0;
2931
2932	} // end vfs_lookup()
2933
2934	///////////////////////////////////////////////////
2935	error_t vfs_add_special_dentries( xptr_t child_xp,
2936	xptr_t parent_xp )
2937	{
2938	error_t error;
2939	vfs_inode_t * child_ptr; // local pointer on child inode directory
2940	cxy_t child_cxy; // child inode directory cluster identifier
2941	vfs_ctx_t * ctx_ptr; // local pointer on child inode FS context
2942	vfs_fs_type_t fs_type; // FS type of child inode
2943	xptr_t dentry_xp; // extended pointer on dentry (used for . and ..)
2944	vfs_dentry_t * dentry_ptr; // local pointer on dentry (used for . and ..)
2945	xptr_t children_xhtab_xp; // extended pointer on inode "children" field
2946	xptr_t children_entry_xp; // extended pointer on dentry "children" field
2947
2948	#if DEBUG_VFS_ADD_SPECIAL
2949	uint32_t cycle = (uint32_t)hal_get_cycles();
2950	thread_t * this = CURRENT_THREAD;
2951	char child_name[CONFIG_VFS_MAX_NAME_LENGTH];
2952	char parent_name[CONFIG_VFS_MAX_NAME_LENGTH];
2953	vfs_inode_get_name( child_xp , child_name );
2954	vfs_inode_get_name( parent_xp , parent_name );
2955	if( DEBUG_VFS_ADD_SPECIAL < cycle )
2956	printk("\n[%s] thread[%x,%x] enter for child <%s> in parent <%s> / cycle %d\n",
2957	__FUNCTION__, this->process->pid, this->trdid, child_name, parent_name, cycle );
2958	#endif
2959
2960	// get child directory cluster and local pointer
2961	child_cxy = GET_CXY( child_xp );
2962	child_ptr = GET_PTR( child_xp );
2963
2964	// get child inode FS type
2965	ctx_ptr = hal_remote_lpt( XPTR( child_cxy , &child_ptr->ctx ) );
2966	fs_type = hal_remote_l32( XPTR( child_cxy , &ctx_ptr->type ) );
2967
2968	//////////////////////////// create <.> dentry //////////////////////
2969	error = vfs_dentry_create( child_cxy,
2970	fs_type,
2971	".",
2972	&dentry_xp );
2973	if( error )
2974	{
2975	printk("\n[ERROR] in %s : cannot create dentry <.> in cluster %x\n",
2976	__FUNCTION__ , child_cxy );
2977	return -1;
2978	}
2979
2980	// get <.> dentry local pointer
2981	dentry_ptr = GET_PTR( dentry_xp );
2982
2983	#if(DEBUG_VFS_ADD_SPECIAL & 1)
2984	cycle = (uint32_t)hal_get_cycles();
2985	if( DEBUG_VFS_ADD_SPECIAL < cycle )
2986	printk("\n[%s] thread[%x,%x] created dentry <.> (%x,%x) / cycle %d\n",
2987	__FUNCTION__, this->process->pid, this->trdid, child_cxy, dentry_ptr, cycle );
2988	#endif
2989
2990	// register <.> dentry in child inode xhtab of children
2991	children_xhtab_xp = XPTR( child_cxy , &child_ptr->children );
2992	children_entry_xp = XPTR( child_cxy , &dentry_ptr->children );
2993
2994	error = xhtab_insert( children_xhtab_xp , "." , children_entry_xp );
2995
2996	if( error )
2997	{
2998	printk("\n[ERROR] in %s : cannot register dentry <.> in xhtab\n",
2999	__FUNCTION__ );
3000	return -1;
3001	}
3002
3003	// update "parent" and "child_xp" fields in <.> dentry
3004	hal_remote_s64( XPTR( child_cxy , &dentry_ptr->child_xp ) , child_xp );
3005	hal_remote_spt( XPTR( child_cxy , &dentry_ptr->parent ) , child_ptr );
3006
3007	#if(DEBUG_VFS_ADD_SPECIAL & 1)
3008	cycle = (uint32_t)hal_get_cycles();
3009	if( DEBUG_VFS_ADD_SPECIAL < cycle )
3010	printk("\n[%s] thread[%x,%x] linked dentry <.> to parent and child inodes / cycle %d\n",
3011	__FUNCTION__, this->process->pid, this->trdid, cycle );
3012	#endif
3013
3014	// introduce <.> dentry into child directory mapper
3015	// only if the target directory is not the root VFS
3016	if( child_xp != parent_xp )
3017	{
3018	error = vfs_fs_add_dentry( child_xp,
3019	dentry_ptr );
3020	if( error )
3021	{
3022	printk("\n[ERROR] in %s : cannot introduce dentry <..> in mapper %x\n",
3023	__FUNCTION__ );
3024	return -1;
3025	}
3026
3027	#if(DEBUG_VFS_ADD_SPECIAL & 1)
3028	cycle = (uint32_t)hal_get_cycles();
3029	if( DEBUG_VFS_ADD_SPECIAL < cycle )
3030	printk("\n[%s] thread[%x,%x] registered dentry <.> in child mapper / cycle %d\n",
3031	__FUNCTION__, this->process->pid, this->trdid, cycle );
3032	#endif
3033
3034	}
3035
3036	///////////////////////////// create <..> dentry ///////////////////////
3037	error = vfs_dentry_create( child_cxy,
3038	fs_type,
3039	"..",
3040	&dentry_xp );
3041	if( error )
3042	{
3043	printk("\n[ERROR] in %s : cannot create dentry <..> in cluster %x\n",
3044	__FUNCTION__ , child_cxy );
3045	return -1;
3046	}
3047
3048	// get <..> dentry local pointer
3049	dentry_ptr = GET_PTR( dentry_xp );
3050
3051	#if(DEBUG_VFS_ADD_SPECIAL & 1)
3052	cycle = (uint32_t)hal_get_cycles();
3053	if( DEBUG_VFS_ADD_SPECIAL < cycle )
3054	printk("\n[%s] thread[%x,%x] created dentry <..> (%x,%x) / cycle %d\n",
3055	__FUNCTION__, this->process->pid, this->trdid, child_cxy, dentry_ptr, cycle );
3056	#endif
3057
3058	// register <..> dentry in child_inode xhtab of children
3059	children_xhtab_xp = XPTR( child_cxy , &child_ptr->children );
3060	children_entry_xp = XPTR( child_cxy , &dentry_ptr->children );
3061	error = xhtab_insert( children_xhtab_xp , ".." , children_entry_xp );
3062	if( error )
3063	{
3064	printk("\n[ERROR] in %s : cannot register dentry <..> in xhtab\n",
3065	__FUNCTION__ );
3066	return -1;
3067	}
3068
3069	// don't register <..> dentry in parent_inode xlist of parents
3070
3071	// update "parent" and "child_xp" fields in <..> dentry
3072	hal_remote_s64( XPTR( child_cxy , &dentry_ptr->child_xp ) , parent_xp );
3073	hal_remote_spt( XPTR( child_cxy , &dentry_ptr->parent ) , child_ptr );
3074
3075	#if(DEBUG_VFS_ADD_SPECIAL & 1)
3076	cycle = (uint32_t)hal_get_cycles();
3077	if( DEBUG_VFS_ADD_SPECIAL < cycle )
3078	printk("\n[%s] thread[%x,%x] linked dentry <..> to parent and child inodes / cycle %d\n",
3079	__FUNCTION__, this->process->pid, this->trdid, cycle );
3080	#endif
3081
3082	// introduce <..> dentry into child directory mapper
3083	// only if the target directory is not the root VFS
3084	if( child_xp != parent_xp )
3085	{
3086	error = vfs_fs_add_dentry( child_xp,
3087	dentry_ptr );
3088	if( error )
3089	{
3090	printk("\n[ERROR] in %s : cannot introduce dentry <..> in mapper %x\n",
3091	__FUNCTION__ );
3092	return -1;
3093	}
3094
3095	#if(DEBUG_VFS_ADD_SPECIAL & 1)
3096	cycle = (uint32_t)hal_get_cycles();
3097	if( DEBUG_VFS_ADD_SPECIAL < cycle )
3098	printk("\n[%s] thread[%x,%x] registered dentry <..> in child mapper / cycle %d\n",
3099	__FUNCTION__, this->process->pid, this->trdid, cycle );
3100	#endif
3101
3102	}
3103
3104	#if DEBUG_VFS_ADD_SPECIAL
3105	cycle = (uint32_t)hal_get_cycles();
3106	if( DEBUG_VFS_ADD_SPECIAL < cycle )
3107	printk("\n[%s] thread[%x,%x] exit for child <%s> in parent <%s> / cycle %d\n",
3108	__FUNCTION__, this->process->pid, this->trdid, child_name, parent_name, cycle );
3109	#endif
3110
3111	return 0;
3112
3113	} // end vfs_add_special_dentries()
3114
3115	//////////////////////////////////////////
3116	error_t vfs_get_path( xptr_t inode_xp,
3117	char * buffer,
3118	char ** first,
3119	uint32_t max_size )
3120	{
3121	xptr_t dentry_xp; // extended pointer on current dentry
3122	vfs_dentry_t * dentry_ptr; // local pointer on current dentry
3123	cxy_t dentry_cxy; // current dentry cluster identifier
3124	xptr_t name_xp; // extended pointer on current dentry name
3125	uint32_t length; // length of current dentry name
3126	int32_t index; // slot index in buffer
3127	xptr_t current_xp; // extended pointer on current inode
3128	vfs_inode_t * current_ptr; // local pointer on current inode
3129	cxy_t current_cxy; // current inode cluster identifier
3130	xptr_t vfs_root_xp; // extended pointer on VFS root inode
3131	vfs_inode_t * vfs_root_ptr; // local pointer on VFS root inode
3132	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
3133	xptr_t lock_xp; // extended pointer on Inode Tree lock
3134	xptr_t parents_root_xp; // extended pointer on current inode parents root
3135	bool_t found; // condition to exit the while loop
3136
3137	thread_t * this = CURRENT_THREAD;
3138	process_t * process = this->process;
3139
3140	#if DEBUG_VFS_GET_PATH
3141	uint32_t cycle = (uint32_t)hal_get_cycles();
3142	if( DEBUG_VFS_GET_PATH < cycle )
3143	printk("\n[%s] thread[%x,%x] enter : inode (%x,%x) / cycle %d\n",
3144	__FUNCTION__ , process->pid, this->trdid,
3145	GET_CXY( inode_xp ), GET_PTR( inode_xp ), cycle );
3146	#endif
3147
3148	// set the NUL character in buffer / initialise buffer index
3149	buffer[max_size - 1] = 0;
3150	index = (int32_t)(max_size - 1);
3151
3152	// initialize current inode
3153	current_xp = inode_xp;
3154
3155	// build extended pointer on lock protecting Inode Tree
3156	vfs_root_xp = process->vfs_root_xp;
3157	vfs_root_ptr = GET_PTR( vfs_root_xp );
3158	vfs_root_cxy = GET_CXY( vfs_root_xp );
3159	lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
3160
3161	// take lock protecting Inode Tree in read mode
3162	remote_rwlock_rd_acquire( lock_xp );
3163
3164	// traverse Inode Tree from target inode to VFS root
3165	// selecting always the first parent dentry
3166	// the buffer is written in "reverse order" (from target inode to root)
3167	// exit the while loop when the VFS root has been found
3168	do
3169	{
3170	// get current inode cluster and local pointer
3171	current_cxy = GET_CXY( current_xp );
3172	current_ptr = GET_PTR( current_xp );
3173
3174	// build extended pointer on parents dentries root
3175	parents_root_xp = XPTR( current_cxy , &current_ptr->parents );
3176
3177	// compute exit condition <=> current inode is VFS root
3178	found = xlist_is_empty( parents_root_xp );
3179
3180	if( found ) // parent is the VFS root
3181	{
3182	if( index == (int32_t)(max_size - 1) )
3183	{
3184	// update index
3185	index--;
3186
3187	// set separator
3188	buffer[index] = '/';
3189
3190	// check buffer overflow
3191	assert( __FUNCTION__, (index >= 0) , "kernel buffer too small" );
3192
3193	}
3194	}
3195	else // not the VFS root
3196	{
3197	// get first parent dentry cluster and pointers
3198	dentry_xp = XLIST_FIRST( parents_root_xp , vfs_dentry_t , parents );
3199	dentry_cxy = GET_CXY( dentry_xp );
3200	dentry_ptr = GET_PTR( dentry_xp );
3201
3202	// get extended pointer on dentry name and name length
3203	name_xp = XPTR( dentry_cxy , dentry_ptr->name );
3204	length = hal_remote_l32( XPTR( dentry_cxy , &dentry_ptr->length ) );
3205
3206	#if (DEBUG_VFS_GET_PATH & 1)
3207	char debug_name[CONFIG_VFS_MAX_NAME_LENGTH];
3208	hal_remote_strcpy( XPTR( local_cxy , debug_name ) , name_xp );
3209	if( DEBUG_VFS_GET_PATH < cycle )
3210	printk("\n[%s] thread(%x,%s) get current dentry <%s> in cluster %x\n",
3211	__FUNCTION__ , process->pid, this->trdid, debug_name, current_cxy );
3212	#endif
3213	// update index
3214	index -= (length + 1);
3215
3216	// check buffer overflow
3217	assert( __FUNCTION__, (index >= 0) , "kernel buffer too small" );
3218
3219	// update pathname
3220	hal_remote_memcpy( XPTR( local_cxy , &buffer[index + 1] ) ,
3221	name_xp , length );
3222
3223	// set separator
3224	buffer[index] = '/';
3225
3226	// get extended pointer on parent inode
3227	current_xp = XPTR( dentry_cxy ,
3228	hal_remote_lpt( XPTR( dentry_cxy , &dentry_ptr->parent ) ) );
3229	}
3230	}
3231	while( found == false );
3232
3233	// release lock protecting Inode Tree in read mode
3234	remote_rwlock_rd_release( lock_xp );
3235
3236	#if DEBUG_VFS_GET_PATH
3237	cycle = (uint32_t)hal_get_cycles();
3238	if( DEBUG_VFS_GET_PATH < cycle )
3239	printk("\n[%s] thread[%x,%x] exit : path <%s> / cycle %d\n",
3240	__FUNCTION__ , process->pid, this->trdid, &buffer[index], cycle );
3241	#endif
3242
3243	// return pointer on first character in buffer
3244	*first = &buffer[index];
3245	return 0;
3246
3247	} // end vfs_get_path()
3248
3249
3250	//////////////////////////////////////////////////////////////
3251	error_t vfs_add_child_in_parent( cxy_t child_cxy,
3252	vfs_fs_type_t fs_type,
3253	xptr_t parent_inode_xp,
3254	char * name,
3255	xptr_t * child_dentry_xp,
3256	xptr_t * child_inode_xp )
3257	{
3258	error_t error;
3259	cxy_t parent_cxy; // parent inode cluster identifier
3260	vfs_inode_t * parent_inode_ptr; // parent inode local pointer
3261	xptr_t new_dentry_xp; // extended pointer on created dentry
3262	vfs_dentry_t * new_dentry_ptr; // created dentry local pointer
3263	xptr_t new_inode_xp; // extended pointer on created child inode
3264	vfs_inode_t * new_inode_ptr; // local pointer on created child inode
3265
3266	xptr_t parents_root_xp; // extended pointer on child inode "parents" field
3267	xptr_t parents_entry_xp; // extended pointer on child dentry "parents" field
3268	xptr_t children_xhtab_xp; // extended pointer on parent inode "children" field
3269	xptr_t children_entry_xp; // extended pointer on child dentry "children" field
3270
3271	// get parent inode cluster and pointer
3272	parent_cxy = GET_CXY( parent_inode_xp );
3273	parent_inode_ptr = GET_PTR( parent_inode_xp );
3274
3275	#if DEBUG_VFS_ADD_CHILD \|\| DEBUG_VFS_ERROR
3276	uint32_t cycle = (uint32_t)hal_get_cycles();
3277	thread_t * this = CURRENT_THREAD;
3278	#endif
3279
3280	#if DEBUG_VFS_ADD_CHILD
3281	char parent_name[CONFIG_VFS_MAX_NAME_LENGTH];
3282	vfs_inode_get_name( parent_inode_xp , parent_name );
3283	if( DEBUG_VFS_ADD_CHILD < cycle )
3284	printk("\n[%s] thread[%x,%x] enter / child <%s> / parent <%s> / cycle %d\n",
3285	__FUNCTION__, this->process->pid, this->trdid, name,
3286	parent_name, (uint32_t)hal_get_cycles() );
3287	#endif
3288
3289	// 1. create dentry in parent cluster
3290	error = vfs_dentry_create( parent_cxy,
3291	fs_type,
3292	name,
3293	&new_dentry_xp );
3294	if( error )
3295	{
3296
3297	#if DEBUG_VFS_ERROR
3298	if( DEBUG_VFS_ERROR < cycle )
3299	printk("\n[ERROR] in %s : thread[%x,%x] cannot create dentry <%s> in cluster %x\n",
3300	__FUNCTION__ , this->process->pid, this->trdid , name , parent_cxy );
3301	#endif
3302	return -1;
3303	}
3304
3305	// get dentry local pointer
3306	new_dentry_ptr = GET_PTR( new_dentry_xp );
3307
3308	#if(DEBUG_VFS_ADD_CHILD & 1)
3309	if( DEBUG_VFS_ADD_CHILD < cycle )
3310	printk("\n[%s] thread[%x,%x] created dentry <%s> : (%x,%x)\n",
3311	__FUNCTION__, this->process->pid, this->trdid, name, parent_cxy, new_dentry_ptr );
3312	#endif
3313
3314	// 2. create child inode in child cluster
3315	// TODO : define attr / mode / uid / gid
3316	uint32_t attr = 0;
3317	uint32_t mode = 0;
3318	uint32_t uid = 0;
3319	uint32_t gid = 0;
3320
3321	error = vfs_inode_create( child_cxy,
3322	fs_type,
3323	attr,
3324	mode,
3325	uid,
3326	gid,
3327	&new_inode_xp );
3328	if( error )
3329	{
3330
3331	#if DEBUG_VFS_ERROR
3332	if( DEBUG_VFS_ERROR < cycle )
3333	printk("\n[ERROR] in %s : thread[%x,%x] cannot create inode in cluster %x\n",
3334	__FUNCTION__ , this->process->pid , this->trdid , child_cxy );
3335	#endif
3336
3337	vfs_dentry_destroy( new_dentry_xp );
3338	return -1;
3339	}
3340
3341	// get new inode local pointer
3342	new_inode_ptr = GET_PTR( new_inode_xp );
3343
3344	#if(DEBUG_VFS_ADD_CHILD & 1)
3345	if( DEBUG_VFS_ADD_CHILD < cycle )
3346	printk("\n[%s] thread[%x,%x] created inode <%s> : (%x,%x)\n",
3347	__FUNCTION__ , this->process->pid, this->trdid, name , child_cxy, new_inode_ptr );
3348	#endif
3349
3350	// 3. register new_dentry in new_inode xlist of parents
3351	parents_root_xp = XPTR( child_cxy , &new_inode_ptr->parents );
3352	parents_entry_xp = XPTR( parent_cxy, &new_dentry_ptr->parents );
3353	xlist_add_first( parents_root_xp , parents_entry_xp );
3354	hal_remote_atomic_add( XPTR( child_cxy , &new_inode_ptr->links ) , 1 );
3355
3356	#if(DEBUG_VFS_ADD_CHILD & 1)
3357	if( DEBUG_VFS_ADD_CHILD < cycle )
3358	printk("\n[%s] thread[%x,%x] linked dentry(%x,%x) to child inode(%x,%x)\n",
3359	__FUNCTION__, this->process->pid, this->trdid,
3360	parent_cxy, new_dentry_ptr, child_cxy, new_inode_ptr );
3361	#endif
3362
3363	// 4. register new_dentry in parent_inode xhtab of children
3364	children_xhtab_xp = XPTR( parent_cxy , &parent_inode_ptr->children );
3365	children_entry_xp = XPTR( parent_cxy , &new_dentry_ptr->children );
3366	xhtab_insert( children_xhtab_xp , name , children_entry_xp );
3367
3368	#if(DEBUG_VFS_ADD_CHILD & 1)
3369	if( DEBUG_VFS_ADD_CHILD < cycle )
3370	printk("\n[%s] thread[%x,%x] linked dentry(%x,%x) to parent inode(%x,%x)\n",
3371	__FUNCTION__, this->process->pid, this->trdid,
3372	parent_cxy, new_dentry_ptr, parent_cxy, parent_inode_ptr );
3373	#endif
3374
3375	// 5. update "parent" and "child_xp" fields in new_dentry
3376	hal_remote_s64( XPTR( parent_cxy , &new_dentry_ptr->child_xp ) , new_inode_xp );
3377	hal_remote_spt( XPTR( parent_cxy , &new_dentry_ptr->parent ) , parent_inode_ptr );
3378
3379	#if DEBUG_VFS_ADD_CHILD
3380	cycle = (uint32_t)hal_get_cycles();
3381	if( DEBUG_VFS_ADD_CHILD < cycle )
3382	printk("\n[%s] thread[%x,%x] exit for <%s> / cycle %d\n",
3383	__FUNCTION__, this->process->pid, this->trdid, name, cycle );
3384	#endif
3385
3386	// return extended pointer on dentry & child inode
3387	*child_dentry_xp = new_dentry_xp;
3388	*child_inode_xp = new_inode_xp;
3389	return 0;
3390
3391	} // end vfs_add_child_in_parent()
3392
3393	/////////////////////////////////////////////////////
3394	void vfs_remove_child_from_parent( xptr_t dentry_xp )
3395	{
3396	cxy_t parent_cxy; // parent inode cluster identifier
3397	cxy_t child_cxy; // child inode cluster identifier
3398	vfs_dentry_t * dentry_ptr; // local pointer on dentry
3399	xptr_t child_inode_xp; // extended pointer on child inode
3400	vfs_inode_t * child_inode_ptr; // local pointer on child inode
3401	vfs_inode_t * parent_inode_ptr; // local pointer on parent inode
3402	uint32_t links; // number of child inode parents
3403	error_t error;
3404
3405	#if DEBUG_VFS_REMOVE_CHILD
3406	uint32_t cycle = (uint32_t)hal_get_cycles();
3407	#endif
3408
3409	char dentry_name[CONFIG_VFS_MAX_NAME_LENGTH];
3410
3411	thread_t * this = CURRENT_THREAD;
3412
3413	// get parent cluster and dentry local pointer
3414	parent_cxy = GET_CXY( dentry_xp );
3415	dentry_ptr = GET_PTR( dentry_xp );
3416
3417	// get a local copy of dentry name
3418	hal_remote_strcpy( XPTR( local_cxy , dentry_name ),
3419	XPTR( parent_cxy , &dentry_ptr->name ) );
3420
3421	// get parent_inode local pointer
3422	parent_inode_ptr = hal_remote_lpt( XPTR( parent_cxy , &dentry_ptr->parent ) );
3423
3424	// get child cluster and child_inode pointers
3425	child_inode_xp = hal_remote_l64( XPTR( parent_cxy , &dentry_ptr->child_xp ) );
3426	child_cxy = GET_CXY( child_inode_xp );
3427	child_inode_ptr = GET_PTR( child_inode_xp );
3428
3429	#if DEBUG_VFS_REMOVE_CHILD
3430	if( DEBUG_VFS_REMOVE_CHILD < cycle )
3431	printk("\n[%s] thread[%x,%x] enter for dentry[%x,%x] / inode[%x,%x] / cycle %d\n",
3432	__FUNCTION__, this->process->pid, this->trdid,
3433	parent_cxy, dentry_ptr, child_cxy, child_inode_ptr, cycle );
3434	#endif
3435
3436	// remove dentry from parent_inode
3437	error = xhtab_remove( XPTR( parent_cxy , &parent_inode_ptr->children ),
3438	dentry_name,
3439	XPTR( parent_cxy , &dentry_ptr->children ) );
3440
3441	if( error )
3442	{
3443	printk("\n[WARNING] in %s] thread[%x,%x] cannot remove dentry %s from parent dir\n",
3444	__FUNCTION__, this->process->pid, this->trdid, dentry_name );
3445	}
3446
3447	#if DEBUG_VFS_REMOVE_CHILD
3448	cycle = (uint32_t)hal_get_cycles();
3449	if( DEBUG_VFS_REMOVE_CHILD < cycle )
3450	printk("\n[%s] thread[%x,%x] removed dentry from parent inode / cycle %d\n",
3451	__FUNCTION__, this->process->pid, this->trdid, cycle );
3452	#endif
3453
3454	// remove dentry from child_inode
3455	xlist_unlink( XPTR( parent_cxy , &dentry_ptr->parents ) );
3456
3457	// get and update number of parents dentries
3458	links = hal_remote_atomic_add( XPTR( child_cxy , &child_inode_ptr->links ) , -1 );
3459
3460	#if DEBUG_VFS_REMOVE_CHILD
3461	cycle = (uint32_t)hal_get_cycles();
3462	if( DEBUG_VFS_REMOVE_CHILD < cycle )
3463	printk("\n[%s] thread[%x,%x] removed dentry from child inode / cycle %d\n",
3464	__FUNCTION__, this->process->pid, this->trdid, cycle );
3465	#endif
3466
3467	// delete dentry descriptor
3468	vfs_dentry_destroy( dentry_xp );
3469
3470	#if DEBUG_VFS_REMOVE_CHILD
3471	cycle = (uint32_t)hal_get_cycles();
3472	if( DEBUG_VFS_REMOVE_CHILD < cycle )
3473	printk("\n[%s] thread[%x,%x] deleted dentry descriptor / cycle %d\n",
3474	__FUNCTION__, this->process->pid, this->trdid, cycle );
3475	#endif
3476
3477	// delete child_inode descriptor if last link
3478	if( links == 1 )
3479	{
3480	vfs_inode_destroy( child_inode_xp );
3481
3482	#if DEBUG_VFS_REMOVE_CHILD
3483	cycle = (uint32_t)hal_get_cycles();
3484	if( DEBUG_VFS_REMOVE_CHILD < cycle )
3485	printk("\n[%s] thread[%x,%x] deleted child inode descriptor / cycle %d\n",
3486	__FUNCTION__, this->process->pid, this->trdid, cycle );
3487	#endif
3488
3489	}
3490	} // end vfs_remove_child_from_parent()
3491
3492
3493
3494
3495	//////////////////////////////////////////////////////////////////////////////////////////
3496	// API used by VFS to access a specific FS
3497	//////////////////////////////////////////////////////////////////////////////////////////
3498
3499	///////////////////////////////////////////////////
3500	error_t vfs_fs_add_dentry( xptr_t inode_xp,
3501	vfs_dentry_t * dentry_ptr )
3502	{
3503	error_t error = 0;
3504
3505	assert( __FUNCTION__, (inode_xp != XPTR_NULL) , "inode_xp argument is NULL" );
3506	assert( __FUNCTION__, (dentry_ptr != NULL ) , "dentry_ptr argument is NULL" );
3507
3508	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
3509	cxy_t inode_cxy = GET_CXY( inode_xp );
3510
3511	// get inode mapper
3512	mapper_t * mapper = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
3513
3514	assert( __FUNCTION__, (mapper != NULL) , "mapper pointer is NULL");
3515
3516	// get FS type
3517	vfs_fs_type_t fs_type = hal_remote_l32( XPTR( inode_cxy , &mapper->fs_type ) );
3518
3519	// call relevant FS function
3520	if( fs_type == FS_TYPE_FATFS )
3521	{
3522	error = fatfs_add_dentry( inode_xp , dentry_ptr );
3523	}
3524	else if( fs_type == FS_TYPE_RAMFS )
3525	{
3526	error = 0; // does nothing for RAMFS
3527	}
3528	else if( fs_type == FS_TYPE_DEVFS )
3529	{
3530	error = 0; // does nothing for DEVFS
3531	}
3532	else
3533	{
3534	assert( __FUNCTION__, false , "undefined file system type" );
3535	}
3536
3537	return error;
3538
3539	} // end vfs_fs_add_dentry()
3540
3541	//////////////////////////////////////////////////////
3542	error_t vfs_fs_remove_dentry( xptr_t inode_xp,
3543	vfs_dentry_t * dentry_ptr )
3544	{
3545	error_t error = 0;
3546
3547	assert( __FUNCTION__, (inode_xp != XPTR_NULL) , "inode_xp argument is NULL" );
3548	assert( __FUNCTION__, (dentry_ptr != NULL ) , "dentry_ptr argument is NULL" );
3549
3550	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
3551	cxy_t inode_cxy = GET_CXY( inode_xp );
3552
3553	// get inode mapper
3554	mapper_t * mapper = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
3555
3556	assert( __FUNCTION__, (mapper != NULL) , "mapper pointer is NULL");
3557
3558	// get FS type
3559	vfs_fs_type_t fs_type = hal_remote_l32( XPTR( inode_cxy , &mapper->fs_type ) );
3560
3561	// call relevant FS function
3562	if( fs_type == FS_TYPE_FATFS )
3563	{
3564	error = fatfs_remove_dentry( inode_xp , dentry_ptr );
3565
3566	}
3567	else if( fs_type == FS_TYPE_RAMFS )
3568	{
3569	error = 0; // does nothing for RAMFS
3570	}
3571	else if( fs_type == FS_TYPE_DEVFS )
3572	{
3573	error = 0; // does nothing for DEVFS
3574	}
3575	else
3576	{
3577	assert( __FUNCTION__, false , "undefined file system type" );
3578	}
3579
3580	return error;
3581
3582	} // end vfs_fs_remove_dentry()
3583
3584	///////////////////////////////////////////////////////////////
3585	error_t vfs_fs_new_dentry_from_mapper( xptr_t inode_xp,
3586	vfs_dentry_t * dentry_ptr )
3587	{
3588	error_t error = 0;
3589
3590	assert( __FUNCTION__, (inode_xp != XPTR_NULL) , "inode_xp argument is NULL" );
3591	assert( __FUNCTION__, (dentry_ptr != NULL ) , "dentry_ptr argument is NULL" );
3592
3593	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
3594	cxy_t inode_cxy = GET_CXY( inode_xp );
3595
3596	// get inode mapper
3597	mapper_t * mapper = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
3598
3599	assert( __FUNCTION__, (mapper != NULL) , "mapper pointer is NULL");
3600
3601	// get FS type
3602	vfs_fs_type_t fs_type = hal_remote_l32( XPTR( inode_cxy , &mapper->fs_type ) );
3603
3604	// call relevant FS function
3605	if( fs_type == FS_TYPE_FATFS )
3606	{
3607	error = fatfs_new_dentry_from_mapper( inode_xp , dentry_ptr );
3608	}
3609	else if( fs_type == FS_TYPE_RAMFS )
3610	{
3611	assert( __FUNCTION__, false , "should not be called for RAMFS" );
3612	}
3613	else if( fs_type == FS_TYPE_DEVFS )
3614	{
3615	assert( __FUNCTION__, false , "should not be called for DEVFS" );
3616	}
3617	else
3618	{
3619	assert( __FUNCTION__, false , "undefined file system type" );
3620	}
3621
3622	return error;
3623
3624	} // end vfs_fs_new_dentry_from_mapper()
3625
3626	///////////////////////////////////////////////////////////////
3627	error_t vfs_fs_new_dentry_to_mapper( xptr_t inode_xp,
3628	vfs_dentry_t * dentry_ptr )
3629	{
3630	error_t error = 0;
3631
3632	assert( __FUNCTION__, (inode_xp != XPTR_NULL) , "inode_xp argument is NULL" );
3633	assert( __FUNCTION__, (dentry_ptr != NULL ) , "dentry_ptr argument is NULL" );
3634
3635	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
3636	cxy_t inode_cxy = GET_CXY( inode_xp );
3637
3638	// get inode mapper
3639	mapper_t * mapper = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
3640
3641	assert( __FUNCTION__, (mapper != NULL) , "mapper pointer is NULL");
3642
3643	// get FS type
3644	vfs_fs_type_t fs_type = hal_remote_l32( XPTR( inode_cxy , &mapper->fs_type ) );
3645
3646	// call relevant FS function
3647	if( fs_type == FS_TYPE_FATFS )
3648	{
3649	error = fatfs_new_dentry_to_mapper( inode_xp , dentry_ptr );
3650	}
3651	else if( fs_type == FS_TYPE_RAMFS )
3652	{
3653	assert( __FUNCTION__, false , "should not be called for RAMFS" );
3654	}
3655	else if( fs_type == FS_TYPE_DEVFS )
3656	{
3657	assert( __FUNCTION__, false , "should not be called for DEVFS" );
3658	}
3659	else
3660	{
3661	assert( __FUNCTION__, false , "undefined file system type" );
3662	}
3663
3664	return error;
3665
3666	} // end vfs_fs_new_dentry_to_mapper()
3667
3668	//////////////////////////////////////////////////////
3669	error_t vfs_fs_update_dentry( xptr_t inode_xp,
3670	vfs_dentry_t * dentry_ptr )
3671	{
3672	error_t error = 0;
3673
3674	assert( __FUNCTION__, (inode_xp != XPTR_NULL) , "inode_xp argument is NULL" );
3675	assert( __FUNCTION__, (dentry_ptr != NULL ) , "dentry_ptr argument is NULL" );
3676
3677	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
3678	cxy_t inode_cxy = GET_CXY( inode_xp );
3679
3680	// get inode mapper
3681	mapper_t * mapper = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
3682
3683	assert( __FUNCTION__, (mapper != NULL) , "mapper pointer is NULL");
3684
3685	// get FS type
3686	vfs_fs_type_t fs_type = hal_remote_l32( XPTR( inode_cxy , &mapper->fs_type ) );
3687
3688	// call relevant FS function
3689	if( fs_type == FS_TYPE_FATFS )
3690	{
3691	error = fatfs_update_dentry( inode_xp , dentry_ptr );
3692	}
3693	else if( fs_type == FS_TYPE_RAMFS )
3694	{
3695	assert( __FUNCTION__, false , "should not be called for RAMFS" );
3696	}
3697	else if( fs_type == FS_TYPE_DEVFS )
3698	{
3699	assert( __FUNCTION__, false , "should not be called for DEVFS" );
3700	}
3701	else
3702	{
3703	assert( __FUNCTION__, false , "undefined file system type" );
3704	}
3705
3706	return error;
3707
3708	} // end vfs_fs_update_dentry()
3709
3710	///////////////////////////////////////////////////
3711	error_t vfs_fs_get_user_dir( vfs_inode_t * inode,
3712	struct dirent * array,
3713	uint32_t max_dirent,
3714	uint32_t min_dentry,
3715	bool_t detailed,
3716	uint32_t * entries,
3717	bool_t * done )
3718	{
3719	error_t error = 0;
3720
3721	// check arguments
3722	assert( __FUNCTION__, (inode != NULL) , "parent pointer is NULL");
3723	assert( __FUNCTION__, (array != NULL) , "child pointer is NULL");
3724	assert( __FUNCTION__, (detailed == false) , "detailed argument not supported\n");
3725
3726	// check inode type
3727	if( inode->type != FILE_TYPE_DIR )
3728	{
3729	printk("\n[ERROR] in %s : target inode is not a directory\n",
3730	__FUNCTION__ );
3731	return -1;
3732	}
3733
3734	// get parent inode FS type
3735	vfs_fs_type_t fs_type = inode->ctx->type;
3736
3737	// call relevant FS function
3738	if( fs_type == FS_TYPE_FATFS )
3739	{
3740	error = fatfs_get_user_dir( inode,
3741	array,
3742	max_dirent,
3743	min_dentry,
3744	detailed,
3745	entries,
3746	done );
3747	}
3748	else if( fs_type == FS_TYPE_RAMFS )
3749	{
3750	assert( __FUNCTION__, false , "should not be called for RAMFS" );
3751	}
3752	else if( fs_type == FS_TYPE_DEVFS )
3753	{
3754	error = devfs_get_user_dir( inode,
3755	array,
3756	max_dirent,
3757	min_dentry,
3758	detailed,
3759	entries,
3760	done );
3761	}
3762	else
3763	{
3764	assert( __FUNCTION__, false , "undefined file system type" );
3765	}
3766
3767	return error;
3768
3769	} // end vfs_fs_get_user_dir()
3770
3771	/////////////////////////////////////////////
3772	error_t vfs_fs_sync_inode( xptr_t inode_xp )
3773	{
3774	error_t error = 0;
3775
3776	assert( __FUNCTION__, (inode_xp != XPTR_NULL) , "inode_xp argument is NULL");
3777
3778	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
3779	cxy_t inode_cxy = GET_CXY( inode_xp );
3780
3781	// get inode mapper
3782	mapper_t * mapper = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
3783
3784	assert( __FUNCTION__, (mapper != NULL) , "mapper pointer is NULL");
3785
3786	// get FS type
3787	vfs_fs_type_t fs_type = hal_remote_l32( XPTR( inode_cxy , &mapper->fs_type ) );
3788
3789	// call relevant FS function
3790	if( fs_type == FS_TYPE_FATFS )
3791	{
3792	error = fatfs_sync_inode( inode_xp );
3793	}
3794	else if( fs_type == FS_TYPE_RAMFS )
3795	{
3796	assert( __FUNCTION__, false , "should not be called for RAMFS" );
3797	}
3798	else if( fs_type == FS_TYPE_DEVFS )
3799	{
3800	assert( __FUNCTION__, false , "should not be called for DEVFS" );
3801	}
3802	else
3803	{
3804	assert( __FUNCTION__, false , "undefined file system type" );
3805	}
3806
3807	return error;
3808
3809	} // end vfs_fs_sync_inode()
3810
3811	////////////////////////////////////////////////
3812	error_t vfs_fs_sync_fat( vfs_fs_type_t fs_type )
3813	{
3814	error_t error = 0;
3815
3816	// call relevant FS function
3817	if( fs_type == FS_TYPE_FATFS )
3818	{
3819	error = fatfs_sync_fat();
3820	}
3821	else if( fs_type == FS_TYPE_RAMFS )
3822	{
3823	assert( __FUNCTION__, false , "should not be called for RAMFS" );
3824	}
3825	else if( fs_type == FS_TYPE_DEVFS )
3826	{
3827	assert( __FUNCTION__, false , "should not be called for DEVFS" );
3828	}
3829	else
3830	{
3831	assert( __FUNCTION__, false , "undefined file system type" );
3832	}
3833
3834	return error;
3835
3836	} // end vfs_fs_sync_fat()
3837
3838	////////////////////////////////////////////////
3839	error_t vfs_fs_release_inode( xptr_t inode_xp )
3840	{
3841	error_t error = 0;
3842
3843	assert( __FUNCTION__, (inode_xp != XPTR_NULL) , "inode_xp argument is NULL");
3844
3845	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
3846	cxy_t inode_cxy = GET_CXY( inode_xp );
3847
3848	// get local pointer on mapper
3849	mapper_t * mapper = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
3850
3851	assert( __FUNCTION__, (mapper != NULL) , "mapper pointer is NULL");
3852
3853	// get FS type from mapper
3854	vfs_fs_type_t fs_type = hal_remote_l32( XPTR( inode_cxy , &mapper->fs_type ) );
3855
3856	// call relevant FS function
3857	if( fs_type == FS_TYPE_FATFS )
3858	{
3859	error = fatfs_release_inode( inode_xp );
3860	}
3861	else if( fs_type == FS_TYPE_RAMFS )
3862	{
3863	assert( __FUNCTION__, false , "should not be called for RAMFS" );
3864	}
3865	else if( fs_type == FS_TYPE_DEVFS )
3866	{
3867	assert( __FUNCTION__, false , "should not be called for DEVFS" );
3868	}
3869	else
3870	{
3871	assert( __FUNCTION__, false , "undefined file system type" );
3872	}
3873
3874	return error;
3875
3876	} // end vfs_fs_release_inode()
3877
3878	//////////////////////////////////////////////////
3879	error_t vfs_fs_move_page( xptr_t page_xp,
3880	ioc_cmd_type_t cmd_type )
3881	{
3882	error_t error = 0;
3883
3884	assert( __FUNCTION__, (page_xp != XPTR_NULL) , "page pointer is NULL" );
3885
3886	page_t * page_ptr = GET_PTR( page_xp );
3887	cxy_t page_cxy = GET_CXY( page_xp );
3888
3889	// get local pointer on mapper
3890	mapper_t * mapper = hal_remote_lpt( XPTR( page_cxy , &page_ptr->mapper ) );
3891
3892	assert( __FUNCTION__, (mapper != NULL) , "no mapper for page" );
3893
3894	// get FS type
3895	vfs_fs_type_t fs_type = hal_remote_l32( XPTR( page_cxy , &mapper->fs_type ) );
3896
3897	// call relevant FS function
3898	if( fs_type == FS_TYPE_FATFS )
3899	{
3900	error = fatfs_move_page( page_xp , cmd_type );
3901	}
3902	else if( fs_type == FS_TYPE_RAMFS )
3903	{
3904	assert( __FUNCTION__, false , "should not be called for RAMFS\n" );
3905	}
3906	else if( fs_type == FS_TYPE_DEVFS )
3907	{
3908	assert( __FUNCTION__, false , "should not be called for DEVFS\n" );
3909	}
3910	else
3911	{
3912	assert( __FUNCTION__, false , "undefined file system type" );
3913	}
3914
3915	return error;
3916
3917	} // end vfs_fs_move_page()
3918
3919

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