Context Navigation

source: trunk/kernel/fs/vfs.c @ 653

Last change on this file since 653 was 651, checked in by alain, 5 years ago
1) Improve the VMM MMAP allocator: implement the "buddy" algorithm to allocate only aligned blocks. 2) fix a bug in the pthread_join() / pthread_exit() mmechanism.
File size: 134.1 KB

Line
1	/*
2	* vfs.c - Virtual File System implementation.
3	*
4	* Author Mohamed Lamine Karaoui (2015)
5	* Alain Greiner (2016,2017,2018,2019)
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 <rpc.h>
36	#include <errno.h>
37	#include <kmem.h>
38	#include <mapper.h>
39	#include <thread.h>
40	#include <chdev.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( vfs_fs_type_t type,
63	uint32_t attr,
64	uint32_t total_clusters,
65	uint32_t cluster_size,
66	xptr_t vfs_root_xp,
67	void * extend )
68	{
69	vfs_ctx_t * vfs_ctx = &fs_context[type];
70
71	vfs_ctx->type = type;
72	vfs_ctx->attr = attr;
73	vfs_ctx->total_clusters = total_clusters;
74	vfs_ctx->cluster_size = cluster_size;
75	vfs_ctx->vfs_root_xp = vfs_root_xp;
76	vfs_ctx->extend = extend;
77
78	busylock_init( &vfs_ctx->lock , LOCK_VFS_CTX );
79
80	bitmap_init( vfs_ctx->bitmap , BITMAP_SIZE(CONFIG_VFS_MAX_INODES) );
81	}
82
83	////////////////////////////////////////////
84	error_t vfs_ctx_inum_alloc( vfs_ctx_t * ctx,
85	uint32_t * inum )
86	{
87	// get lock on inum allocator
88	busylock_acquire( &ctx->lock );
89
90	// get lid from local inum allocator
91	uint32_t lid = bitmap_ffc( ctx->bitmap , CONFIG_VFS_MAX_INODES );
92
93	if( lid == 0xFFFFFFFF ) // no more free slot => error
94	{
95	// release lock
96	busylock_release( &ctx->lock );
97
98	// return error
99	return 1;
100	}
101	else // found => return inum
102	{
103	// set slot allocated
104	bitmap_set( ctx->bitmap , lid );
105
106	// release lock
107	busylock_release( &ctx->lock );
108
109	// return inum
110	*inum = (((uint32_t)local_cxy) << 16) \| (lid & 0xFFFF);
111	return 0;
112	}
113	}
114
115	////////////////////////////////////////////
116	void vfs_ctx_inum_release( vfs_ctx_t * ctx,
117	uint32_t inum )
118	{
119	bitmap_clear( ctx->bitmap , inum & 0xFFFF );
120	}
121
122	//////////////////////////////////////////////////////////////////////////////////////////
123	// VFS inode descriptor related functions
124	//////////////////////////////////////////////////////////////////////////////////////////
125
126	const char * vfs_inode_type_str( vfs_inode_type_t type )
127	{
128	switch ( type )
129	{
130	case INODE_TYPE_FILE: return "FILE";
131	case INODE_TYPE_DIR: return "DIR ";
132	case INODE_TYPE_FIFO: return "FIFO";
133	case INODE_TYPE_PIPE: return "PIPE";
134	case INODE_TYPE_SOCK: return "SOCK";
135	case INODE_TYPE_DEV: return "DEV ";
136	case INODE_TYPE_BLK: return "BLK ";
137	case INODE_TYPE_SYML: return "SYML";
138	default: return "undefined";
139	}
140	}
141
142	////////////////////////////////////////////////////
143	error_t vfs_inode_create( vfs_fs_type_t fs_type,
144	uint32_t attr,
145	uint32_t rights,
146	uid_t uid,
147	gid_t gid,
148	xptr_t * inode_xp )
149	{
150	mapper_t * mapper; // associated mapper( to be allocated)
151	vfs_inode_t * inode; // inode descriptor (to be allocated)
152
153	uint32_t inum; // inode identifier (to be allocated)
154	vfs_ctx_t * ctx; // file system context
155	kmem_req_t req; // request to kernel memory allocator
156	error_t error;
157
158	// check fs type and get pointer on context
159	if ( fs_type == FS_TYPE_FATFS ) ctx = &fs_context[FS_TYPE_FATFS];
160	else if( fs_type == FS_TYPE_RAMFS ) ctx = &fs_context[FS_TYPE_RAMFS];
161	else if( fs_type == FS_TYPE_DEVFS ) ctx = &fs_context[FS_TYPE_DEVFS];
162	else
163	{
164	printk("\n[ERROR] in %s : illegal FS type\n", __FUNCTION__ );
165	return -1;
166	}
167
168	// allocate inum
169	error = vfs_ctx_inum_alloc( ctx , &inum );
170
171	if( error )
172	{
173	printk("\n[ERROR] in %s : cannot allocate inum\n", __FUNCTION__ );
174	return -1;
175	}
176
177	// allocate memory for mapper
178	mapper = mapper_create( fs_type );
179
180	if( mapper == NULL )
181	{
182	printk("\n[ERROR] in %s : cannot allocate mapper\n", __FUNCTION__ );
183	vfs_ctx_inum_release( ctx , inum );
184	return ENOMEM;
185	}
186
187	// check inode descriptor contained in one page
188	assert( (sizeof(vfs_inode_t) <= CONFIG_PPM_PAGE_SIZE),
189	"inode descriptor must fit in one page" );
190
191	// allocate one page for VFS inode descriptor
192	// because the embedded "children xhtab footprint
193	req.type = KMEM_PPM;
194	req.order = 0;
195	req.flags = AF_KERNEL \| AF_ZERO;
196	inode = kmem_alloc( &req );
197
198	if( inode == NULL )
199	{
200	printk("\n[ERROR] in %s : cannot allocate inode descriptor\n", __FUNCTION__ );
201	vfs_ctx_inum_release( ctx , inum );
202	mapper_destroy( mapper );
203	return -1;
204	}
205
206	// initialize inode descriptor
207	inode->type = INODE_TYPE_FILE; // default value
208	inode->inum = inum;
209	inode->attr = attr;
210	inode->rights = rights;
211	inode->uid = uid;
212	inode->gid = gid;
213	inode->ctx = ctx;
214	inode->mapper = mapper;
215	inode->extend = NULL;
216	inode->links = 0;
217
218	// initialise inode field in mapper
219	mapper->inode = inode;
220
221	// initialize chidren dentries xhtab
222	xhtab_init( &inode->children , XHTAB_DENTRY_TYPE );
223
224	// initialize parents dentries xlist
225	xlist_root_init( XPTR( local_cxy , &inode->parents ) );
226
227	// initialize lock protecting size
228	remote_rwlock_init( XPTR( local_cxy , &inode->size_lock ), LOCK_VFS_SIZE );
229
230	// initialise lock protecting inode tree traversal
231	remote_rwlock_init( XPTR( local_cxy , &inode->main_lock ), LOCK_VFS_MAIN );
232
233	// return extended pointer on inode
234	*inode_xp = XPTR( local_cxy , inode );
235
236	#if DEBUG_VFS_INODE_CREATE
237	char name[CONFIG_VFS_MAX_NAME_LENGTH];
238	uint32_t cycle = (uint32_t)hal_get_cycles();
239	thread_t * this = CURRENT_THREAD;
240	vfs_inode_get_name( *inode_xp , name );
241	if( DEBUG_VFS_INODE_CREATE < cycle )
242	printk("\n[%s] thread[%x,%x] created <%s> / inode [%x,%x] / cycle %d\n",
243	__FUNCTION__, this->process->pid, this->trdid, name, local_cxy, inode, cycle );
244	#endif
245
246	return 0;
247
248	} // end vfs_inode_create()
249
250	/////////////////////////////////////////////
251	void vfs_inode_destroy( vfs_inode_t * inode )
252	{
253	// release memory allocated for mapper
254	mapper_destroy( inode->mapper );
255
256	// release memory allocate for inode descriptor
257	kmem_req_t req;
258	req.type = KMEM_PPM;
259	req.ptr = inode;
260	kmem_free( &req );
261
262	} // end vfs_inode_destroy()
263
264	//////////////////////////////////////////////
265	uint32_t vfs_inode_get_size( xptr_t inode_xp )
266	{
267	// get inode cluster and local pointer
268	cxy_t cxy = GET_CXY( inode_xp );
269	vfs_inode_t * ptr = GET_PTR( inode_xp );
270
271	// build extended pointers on lock & size
272	xptr_t lock_xp = XPTR( cxy , &ptr->size_lock );
273	xptr_t size_xp = XPTR( cxy , &ptr->size );
274
275	// take lock in read mode
276	remote_rwlock_rd_acquire( lock_xp );
277
278	// get size
279	uint32_t size = hal_remote_l32( size_xp );
280
281	// release lock from read mode
282	remote_rwlock_rd_release( lock_xp );
283
284	return size;
285	}
286
287	///////////////////////////////////////////////
288	void vfs_inode_update_size( xptr_t inode_xp,
289	uint32_t size )
290	{
291	// get inode cluster and local pointer
292	cxy_t cxy = GET_CXY( inode_xp );
293	vfs_inode_t * ptr = GET_PTR( inode_xp );
294
295	// build extended pointers on lock & size
296	xptr_t lock_xp = XPTR( cxy , &ptr->size_lock );
297	xptr_t size_xp = XPTR( cxy , &ptr->size );
298
299	// take lock in write mode
300	remote_rwlock_wr_acquire( lock_xp );
301
302	// get current size
303	uint32_t current_size = hal_remote_l32( size_xp );
304
305	// set size if required
306	if( current_size < size ) hal_remote_s32( size_xp , size );
307
308	// release lock from write mode
309	remote_rwlock_wr_release( lock_xp );
310	}
311
312	////////////////////////////////////////
313	void vfs_inode_unlock( xptr_t inode_xp )
314	{
315	// get inode cluster and local pointer
316	cxy_t cxy = GET_CXY( inode_xp );
317	vfs_inode_t * ptr = GET_PTR( inode_xp );
318
319	// release the main lock
320	remote_busylock_release( XPTR( cxy , &ptr->main_lock ) );
321	}
322
323	//////////////////////////////////////
324	void vfs_inode_lock( xptr_t inode_xp )
325	{
326	// get inode cluster and local pointer
327	cxy_t cxy = GET_CXY( inode_xp );
328	vfs_inode_t * ptr = GET_PTR( inode_xp );
329
330	// get the main lock
331	remote_busylock_acquire( XPTR( cxy , &ptr->main_lock ) );
332	}
333
334	///////////////////////////////////////////
335	void vfs_inode_get_name( xptr_t inode_xp,
336	char * name )
337	{
338	cxy_t inode_cxy; // inode cluster identifier
339	vfs_inode_t * inode_ptr; // local pointer on inode
340	xptr_t parents_root_xp; // extended pointer on inode parents root
341
342	// get inode cluster and local pointer
343	inode_cxy = GET_CXY( inode_xp );
344	inode_ptr = GET_PTR( inode_xp );
345
346	// build extended pointer on parents dentries root
347	parents_root_xp = XPTR( inode_cxy , &inode_ptr->parents );
348
349	// check VFS root
350	if( xlist_is_empty( parents_root_xp ) ) // inode is the VFS root
351	{
352	strcpy( name , "/" );
353	}
354	else // not the VFS root
355	{
356	xptr_t dentry_xp;
357	cxy_t dentry_cxy;
358	vfs_dentry_t * dentry_ptr;
359
360	// get first name in list of parents
361	dentry_xp = XLIST_FIRST( parents_root_xp , vfs_dentry_t , parents );
362	dentry_cxy = GET_CXY( dentry_xp );
363	dentry_ptr = GET_PTR( dentry_xp );
364
365	hal_remote_strcpy( XPTR( local_cxy , name ) ,
366	XPTR( dentry_cxy , dentry_ptr->name ) );
367	}
368
369	} // end vfs_inode_get_name()
370
371	///////////////////////////////////////////////////////
372	error_t vfs_inode_load_all_pages( vfs_inode_t * inode )
373	{
374
375	assert( (inode != NULL) , "inode pointer is NULL" );
376
377	uint32_t page_id;
378	xptr_t page_xp;
379
380	mapper_t * mapper = inode->mapper;
381	uint32_t size = inode->size;
382
383	assert( (mapper != NULL) , "mapper pointer is NULL" );
384
385	#if DEBUG_VFS_INODE_LOAD_ALL
386	uint32_t cycle = (uint32_t)hal_get_cycles();
387	thread_t * this = CURRENT_THREAD;
388	char name[CONFIG_VFS_MAX_NAME_LENGTH];
389	vfs_inode_get_name( XPTR( local_cxy , inode ) , name );
390	if( DEBUG_VFS_INODE_LOAD_ALL < cycle )
391	printk("\n[%s] thread[%x,%x] enter for <%s> in cluster %x / cycle %d\n",
392	__FUNCTION__, this->process->pid, this->trdid, name, local_cxy, cycle );
393	#endif
394
395	// compute number of pages
396	uint32_t npages = size >> CONFIG_PPM_PAGE_SHIFT;
397	if( (size & CONFIG_PPM_PAGE_MASK) \|\| (size == 0) ) npages++;
398
399	// loop on pages
400	for( page_id = 0 ; page_id < npages ; page_id ++ )
401	{
402	// If the mage is missing, this function allocates the missing page,
403	// and load the page from IOC device into mapper
404	page_xp = mapper_remote_get_page( XPTR( local_cxy , mapper ), page_id );
405
406	if( page_xp == XPTR_NULL ) return -1;
407	}
408
409	#if DEBUG_VFS_INODE_LOAD_ALL
410	cycle = (uint32_t)hal_get_cycles();
411	if( DEBUG_VFS_INODE_LOAD_ALL < cycle )
412	printk("\n[%s] thread[%x,%x] exit for <%x> in cluster %x / cycle %d\n",
413	__FUNCTION__, this->process->pid, this->trdid, name, local_cxy, cycle );
414	#endif
415
416	return 0;
417
418	} // end vfs_inode_load_all_pages()
419
420	/////////////////////////////////////////
421	void vfs_inode_display( xptr_t inode_xp )
422	{
423	assert( (inode_xp != XPTR_NULL), "inode pointer is NULL");
424
425	char name[CONFIG_VFS_MAX_NAME_LENGTH];
426
427	vfs_inode_get_name( inode_xp , name );
428
429	cxy_t inode_cxy = GET_CXY( inode_xp );
430	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
431
432	vfs_inode_type_t type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
433	uint32_t attr = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->attr ) );
434	uint32_t size = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->size ) );
435	uint32_t parents = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->links ) );
436	mapper_t * mapper = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
437	void * extend = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->extend ) );
438
439	printk("\n**** inode <%s>\n"
440	" - type = %s\n"
441	" - attr = %x\n"
442	" - size = %d\n"
443	" - parents = %d\n"
444	" - cxy = %x\n"
445	" - inode = %x\n"
446	" - mapper = %x\n"
447	" - extend = %x\n",
448	name,
449	vfs_inode_type_str( type ),
450	attr,
451	size,
452	parents,
453	inode_cxy,
454	inode_ptr,
455	mapper,
456	extend );
457
458	} // end vfs_inode_display()
459
460
461	////////////////////////////////////////////////////////////////////////////////////////////
462	// VFS dentry descriptor related functions
463	//////////////////////////////////////////////////////////////////////////////////////////
464
465	///////////////////////////////////////////////////
466	error_t vfs_dentry_create( vfs_fs_type_t fs_type,
467	char * name,
468	xptr_t * dentry_xp )
469	{
470	vfs_ctx_t * ctx; // context descriptor
471	vfs_dentry_t * dentry; // dentry descriptor (to be allocated)
472	kmem_req_t req; // request to kernel memory allocator
473
474	// get pointer on context
475	if ( fs_type == FS_TYPE_FATFS ) ctx = &fs_context[FS_TYPE_FATFS];
476	else if( fs_type == FS_TYPE_RAMFS ) ctx = &fs_context[FS_TYPE_RAMFS];
477	else if( fs_type == FS_TYPE_DEVFS ) ctx = &fs_context[FS_TYPE_DEVFS];
478	else
479	{
480	ctx = NULL;
481	return -1;
482	}
483
484	// get name length
485	uint32_t length = strlen( name );
486
487	if( length >= CONFIG_VFS_MAX_NAME_LENGTH ) return EINVAL;
488
489	// allocate memory for dentry descriptor
490	req.type = KMEM_KCM;
491	req.order = bits_log2( sizeof(vfs_dentry_t) );
492	req.flags = AF_KERNEL \| AF_ZERO;
493	dentry = kmem_alloc( &req );
494
495	if( dentry == NULL )
496	{
497	printk("\n[ERROR] in %s : cannot allocate dentry descriptor\n",
498	__FUNCTION__ );
499	return -1;
500	}
501
502	// initialize dentry descriptor
503	dentry->ctx = ctx;
504	dentry->length = length;
505	dentry->extend = NULL;
506	strcpy( dentry->name , name );
507
508	// return extended pointer on dentry
509	*dentry_xp = XPTR( local_cxy , dentry );
510
511	#if DEBUG_VFS_DENTRY_CREATE
512	thread_t * this = CURRENT_THREAD;
513	uint32_t cycle = (uint32_t)hal_get_cycles();
514	if( DEBUG_VFS_DENTRY_CREATE < cycle )
515	printk("\n[%s] thread[%x,%x] created <%s> / dentry [%x,%x] / cycle %d\n",
516	__FUNCTION__, this->process->pid, this->trdid, name, local_cxy, dentry, cycle );
517	#endif
518
519	return 0;
520
521	} // end vfs_dentry_create()
522
523	////////////////////////////////////////////////
524	void vfs_dentry_destroy( vfs_dentry_t * dentry )
525	{
526	// release memory allocated to dentry
527	kmem_req_t req;
528	req.type = KMEM_KCM;
529	req.ptr = dentry;
530	kmem_free( &req );
531
532	} // end vfs_dentry_destroy()
533
534
535	//////////////////////////////////////////////////////////////////////////////////////////
536	// VFS file descriptor related functions
537	//////////////////////////////////////////////////////////////////////////////////////////
538
539	/////////////////////////////////////////////
540	error_t vfs_file_create( vfs_inode_t * inode,
541	uint32_t attr,
542	xptr_t * file_xp )
543	{
544	vfs_file_t * file;
545	kmem_req_t req;
546
547	#if DEBUG_VFS_FILE_CREATE
548	thread_t * this = CURRENT_THREAD;
549	uint32_t cycle = (uint32_t)hal_get_cycles();
550	if( DEBUG_VFS_OPEN < cycle )
551	printk("\n[%s] thread[%x,%x] enter for inode %x in cluster %x / cycle %d\n",
552	__FUNCTION__, this->process->pid, this->trdid, inode, local_cxy, cycle );
553	#endif
554
555	// allocate memory for new file descriptor
556	req.type = KMEM_KCM;
557	req.order = bits_log2( sizeof(vfs_file_t) );
558	req.flags = AF_KERNEL \| AF_ZERO;
559	file = kmem_alloc( &req );
560
561	if( file == NULL ) return ENOMEM;
562
563	// initializes new file descriptor
564	file->gc = 0;
565	file->type = inode->type;
566	file->attr = attr;
567	file->offset = 0;
568	file->refcount = 1;
569	file->inode = inode;
570	file->ctx = inode->ctx;
571	file->mapper = inode->mapper;
572
573	remote_rwlock_init( XPTR( local_cxy , &file->lock ), LOCK_VFS_FILE );
574
575	*file_xp = XPTR( local_cxy , file );
576
577	#if DEBUG_VFS_FILE_CREATE
578	cycle = (uint32_t)hal_get_cycles();
579	if( DEBUG_VFS_OPEN < cycle )
580	printk("\n[%s] thread[%x,%x] created file %x in cluster %x / cycle %d\n",
581	__FUNCTION__, this->process->pid, this->trdid, file, local_cxy, cycle );
582	#endif
583
584	return 0;
585
586	} // end vfs_file_create()
587
588	///////////////////////////////////////////
589	void vfs_file_destroy( vfs_file_t * file )
590	{
591	kmem_req_t req;
592	req.type = KMEM_KCM;
593	req.ptr = file;
594	kmem_free( &req );
595
596	#if DEBUG_VFS_CLOSE
597	char name[CONFIG_VFS_MAX_NAME_LENGTH];
598	vfs_file_get_name( XPTR( local_cxy , file ) , name );
599	thread_t * this = CURRENT_THREAD;
600	uint32_t cycle = (uint32_t)hal_get_cycles();
601	if( DEBUG_VFS_CLOSE < cycle )
602	printk("\n[%s] thread[%x,%x] deleted file <%s> in cluster %x / cycle %d\n",
603	__FUNCTION__, this->process->pid, this->trdid, name, local_cxy, cycle );
604	#endif
605
606	} // end vfs_file_destroy()
607
608
609	////////////////////////////////////////
610	void vfs_file_count_up( xptr_t file_xp )
611	{
612	// get file cluster and local pointer
613	cxy_t file_cxy = GET_CXY( file_xp );
614	vfs_file_t * file_ptr = GET_PTR( file_xp );
615
616	// atomically increment count
617	hal_remote_atomic_add( XPTR( file_cxy , &file_ptr->refcount ) , 1 );
618	}
619
620	//////////////////////////////////////////
621	void vfs_file_count_down( xptr_t file_xp )
622	{
623	// get file cluster and local pointer
624	cxy_t file_cxy = GET_CXY( file_xp );
625	vfs_file_t * file_ptr = GET_PTR( file_xp );
626
627	// atomically decrement count
628	hal_remote_atomic_add( XPTR( file_cxy , &file_ptr->refcount ) , -1 );
629	}
630
631	///////////////////////////////////////
632	void vfs_file_get_name( xptr_t file_xp,
633	char * name )
634	{
635	// get cluster and local pointer on remote file
636	vfs_file_t * file_ptr = GET_PTR( file_xp );
637	cxy_t file_cxy = GET_CXY( file_xp );
638
639	// get pointers on remote inode
640	vfs_inode_t * inode_ptr = hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
641	xptr_t inode_xp = XPTR( file_cxy , inode_ptr );
642
643	// call the relevant function
644	vfs_inode_get_name( inode_xp , name );
645	}
646
647
648	//////////////////////////////////////////////////////////////////////////////////////////
649	// "syscalls" API related functions
650	//////////////////////////////////////////////////////////////////////////////////////////
651
652	//////////////////////////////////////
653	error_t vfs_open( xptr_t root_xp,
654	char * path,
655	xptr_t process_xp,
656	uint32_t flags,
657	uint32_t mode,
658	xptr_t * new_file_xp,
659	uint32_t * new_file_id )
660	{
661	error_t error;
662	xptr_t inode_xp; // extended pointer on target inode
663	cxy_t inode_cxy; // inode cluster identifier
664	vfs_inode_t * inode_ptr; // inode local pointer
665	uint32_t file_attr; // file descriptor attributes
666	uint32_t lookup_mode; // lookup working mode
667	xptr_t file_xp; // extended pointer on created file descriptor
668	uint32_t file_id; // created file descriptor index in reference fd_array
669	xptr_t vfs_root_xp; // extended pointer on VFS root inode
670	vfs_inode_t * vfs_root_ptr; // local pointer on VFS root inode
671	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
672	xptr_t lock_xp; // extended pointer on Inode Tree lock
673
674	if( mode != 0 )
675	{
676	printk("\n[ERROR] in %s : the mode parameter is not supported yet\n" );
677	return -1;
678	}
679
680	thread_t * this = CURRENT_THREAD;
681	process_t * process = this->process;
682
683	// compute lookup working mode
684	lookup_mode = VFS_LOOKUP_OPEN;
685	if( (flags & O_DIR ) ) lookup_mode \|= VFS_LOOKUP_DIR;
686	if( (flags & O_CREAT ) ) lookup_mode \|= VFS_LOOKUP_CREATE;
687	if( (flags & O_EXCL ) ) lookup_mode \|= VFS_LOOKUP_EXCL;
688
689	#if DEBUG_VFS_OPEN
690	uint32_t cycle = (uint32_t)hal_get_cycles();
691	if( DEBUG_VFS_OPEN < cycle )
692	printk("\n[%s] thread[%x,%x] enter for <%s> / root_inode (%x,%x) / cycle %d\n",
693	__FUNCTION__, process->pid, this->trdid, path, GET_CXY(root_xp), GET_PTR(root_xp), cycle );
694	#endif
695
696	// compute attributes for the created file
697	file_attr = 0;
698	if( (flags & O_RDONLY ) == 0 ) file_attr \|= FD_ATTR_WRITE_ENABLE;
699	if( (flags & O_WRONLY ) == 0 ) file_attr \|= FD_ATTR_READ_ENABLE;
700	if( (flags & O_SYNC ) ) file_attr \|= FD_ATTR_SYNC;
701	if( (flags & O_APPEND ) ) file_attr \|= FD_ATTR_APPEND;
702	if( (flags & O_CLOEXEC) ) file_attr \|= FD_ATTR_CLOSE_EXEC;
703
704	// build extended pointer on lock protecting Inode Tree
705	vfs_root_xp = process->vfs_root_xp;
706	vfs_root_ptr = GET_PTR( vfs_root_xp );
707	vfs_root_cxy = GET_CXY( vfs_root_xp );
708	lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
709
710	// take lock protecting Inode Tree in read mode
711	remote_rwlock_rd_acquire( lock_xp );
712
713	// get extended pointer on target inode
714	error = vfs_lookup( root_xp,
715	path,
716	lookup_mode,
717	&inode_xp,
718	NULL );
719
720	// release lock protecting Inode Tree
721	remote_rwlock_rd_release( lock_xp );
722
723	if( error )
724	{
725	printk("\n[ERROR] in %s : cannot get inode <%s>\n",
726	__FUNCTION__ , path );
727	return -1;
728	}
729
730	// get target inode cluster and local pointer
731	inode_cxy = GET_CXY( inode_xp );
732	inode_ptr = GET_PTR( inode_xp );
733
734	#if (DEBUG_VFS_OPEN & 1)
735	cycle = (uint32_t)hal_get_cycles();
736	if( DEBUG_VFS_OPEN < cycle )
737	printk("\n[%s] thread[%x,%x] found inode(%x,%x) for <%s>\n",
738	__FUNCTION__, process->pid, this->trdid, inode_cxy, inode_ptr, path );
739	#endif
740
741	// create a new file descriptor in cluster containing inode
742	if( inode_cxy == local_cxy ) // target cluster is local
743	{
744	error = vfs_file_create( inode_ptr , file_attr , &file_xp );
745	}
746	else // target cluster is remote
747	{
748	rpc_vfs_file_create_client( inode_cxy , inode_ptr , file_attr , &file_xp , &error );
749	}
750
751	if( error ) return error;
752
753	#if (DEBUG_VFS_OPEN & 1)
754	cycle = (uint32_t)hal_get_cycles();
755	if( DEBUG_VFS_OPEN < cycle )
756	printk("\n[%s] thread[%x,%x] created file descriptor (%x,%x) for <%s>\n",
757	__FUNCTION__, process->pid, this->trdid, GET_CXY(file_xp), GET_PTR(file_xp), path );
758	#endif
759
760	// allocate and register a new file descriptor index in reference process
761	error = process_fd_register( process_xp , file_xp , &file_id );
762
763	if( error ) return error;
764
765	#if DEBUG_VFS_OPEN
766	cycle = (uint32_t)hal_get_cycles();
767	if( DEBUG_VFS_OPEN < cycle )
768	printk("\n[%s] thread[%x,%x] exit for <%s> / fdid %d / cxy %x / cycle %d\n",
769	__FUNCTION__, process->pid, this->trdid, path, file_id, GET_CXY( file_xp ), cycle );
770	#endif
771
772	// success
773	*new_file_xp = file_xp;
774	*new_file_id = file_id;
775	return 0;
776
777	} // end vfs_open()
778
779	//////////////////////////////////////
780	int vfs_user_move( bool_t to_buffer,
781	xptr_t file_xp,
782	void * buffer,
783	uint32_t size )
784	{
785	cxy_t file_cxy; // remote file descriptor cluster
786	vfs_file_t * file_ptr; // remote file descriptor local pointer
787	vfs_inode_type_t inode_type;
788	uint32_t file_offset; // current offset in file
789	mapper_t * mapper;
790	error_t error;
791
792	// check argument
793	assert( (file_xp != XPTR_NULL), "file_xp == XPTR_NULL" );
794
795	// get cluster and local pointer on remote file descriptor
796	file_cxy = GET_CXY( file_xp );
797	file_ptr = GET_PTR( file_xp );
798
799	// get inode type from remote file descriptor
800	inode_type = hal_remote_l32( XPTR( file_cxy , &file_ptr->type ) );
801
802	// check inode type
803	assert( (inode_type == INODE_TYPE_FILE), "bad inode type" );
804
805	// get mapper pointer and file offset from file descriptor
806	file_offset = hal_remote_l32( XPTR( file_cxy , &file_ptr->offset ) );
807	mapper = hal_remote_lpt( XPTR( file_cxy , &file_ptr->mapper ) );
808
809	#if DEBUG_VFS_USER_MOVE
810	char name[CONFIG_VFS_MAX_NAME_LENGTH];
811	uint32_t cycle = (uint32_t)hal_get_cycles();
812	thread_t * this = CURRENT_THREAD;
813	vfs_inode_t * inode = hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
814	vfs_inode_get_name( XPTR( file_cxy , inode ) , name );
815	if( cycle > DEBUG_VFS_USER_MOVE )
816	{
817	if( to_buffer )
818	printk("\n[%s] thread[%x,%x] enter / %d bytes / map(%s) -> buf(%x) / offset %d / cycle %d\n",
819	__FUNCTION__ , this->process->pid, this->trdid, size, name, buffer, file_offset, cycle );
820	else
821	printk("\n[%s] thread[%x,%x] enter / %d bytes / buf(%x) -> map(%s) / offset %d / cycle %d\n",
822	__FUNCTION__ , this->process->pid, this->trdid, size, buffer, name, file_offset, cycle );
823	}
824	#endif
825
826	// move data between mapper and buffer
827	error = mapper_move_user( XPTR( file_cxy , mapper ),
828	to_buffer,
829	file_offset,
830	buffer,
831	size );
832	if( error )
833	{
834	printk("\n[ERROR] in %s : cannot move data", __FUNCTION__ );
835	return -1;
836	}
837
838	// update file offset in file descriptor
839	hal_remote_atomic_add( XPTR( file_cxy , &file_ptr->offset ) , size );
840
841	#if DEBUG_VFS_USER_MOVE
842	cycle = (uint32_t)hal_get_cycles();
843	if( cycle > DEBUG_VFS_USER_MOVE )
844	{
845	if( to_buffer )
846	printk("\n[%s] thread[%x,%x] exit / cycle %d\n",
847	__FUNCTION__ , this->process->pid, cycle );
848	else
849	printk("\n[%s] thread[%x,%x] exit / cycle %d\n",
850	__FUNCTION__ , this->process->pid, cycle );
851	}
852	#endif
853
854	return size;
855
856	} // end vfs_user_move()
857
858	////////////////////////////////////////////
859	error_t vfs_kernel_move( bool_t to_buffer,
860	xptr_t file_xp,
861	xptr_t buffer_xp,
862	uint32_t size )
863	{
864	cxy_t file_cxy; // remote file descriptor cluster
865	vfs_file_t * file_ptr; // remote file descriptor local pointer
866	vfs_inode_type_t inode_type; // remote file type
867	uint32_t file_offset; // current offset in file
868	mapper_t * mapper_ptr; // remote mapper local pointer
869	xptr_t mapper_xp; // remote mapper extended pointer
870	error_t error;
871
872	// check argument
873	assert( (file_xp != XPTR_NULL) , "file_xp == XPTR_NULL" );
874
875	// get cluster and local pointer on remote file descriptor
876	file_cxy = GET_CXY( file_xp );
877	file_ptr = GET_PTR( file_xp );
878
879	// get inode type from remote file descriptor
880	inode_type = hal_remote_l32( XPTR( file_cxy , &file_ptr->type ) );
881
882	// check inode type
883	assert( (inode_type == INODE_TYPE_FILE), "bad file type" );
884
885	// get mapper pointers and file offset from file descriptor
886	file_offset = hal_remote_l32( XPTR( file_cxy , &file_ptr->offset ) );
887	mapper_ptr = hal_remote_lpt( XPTR( file_cxy , &file_ptr->mapper ) );
888	mapper_xp = XPTR( file_cxy , mapper_ptr );
889
890	// move data between mapper and buffer
891	error = mapper_move_kernel( mapper_xp,
892	to_buffer,
893	file_offset,
894	buffer_xp,
895	size );
896	if( error )
897	{
898	printk("\n[ERROR] in %s : cannot move data", __FUNCTION__ );
899	return -1;
900	}
901
902	#if DEBUG_VFS_KERNEL_MOVE
903	char name[CONFIG_VFS_MAX_NAME_LENGTH];
904	uint32_t cycle = (uint32_t)hal_get_cycles();
905	thread_t * this = CURRENT_THREAD;
906	cxy_t buffer_cxy = GET_CXY( buffer_xp );
907	void * buffer_ptr = GET_PTR( buffer_xp );
908	vfs_inode_t * inode = hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
909	vfs_inode_get_name( XPTR( file_cxy , inode ) , name );
910	if( cycle > DEBUG_VFS_KERNEL_MOVE )
911	{
912	if( to_buffer )
913	printk("\n[%s] thread[%x,%x] moves %d bytes from <%s> mapper to buffer(%x,%x) / cycle %d\n",
914	__FUNCTION__ , this->process->pid, this->trdid, size, name, buffer_cxy, buffer_ptr );
915	else
916	printk("\n[%s] thread[%x,%x] moves %d bytes from buffer(%x,%x) to <%s> mapper / cycle %d\n",
917	__FUNCTION__ , this->process->pid, this->trdid, size, buffer_cxy, buffer_ptr, name );
918	}
919	#endif
920
921	return 0;
922
923	} // end vfs_kernel_move()
924
925	//////////////////////////////////////
926	error_t vfs_lseek( xptr_t file_xp,
927	uint32_t offset,
928	uint32_t whence,
929	uint32_t * new_offset )
930	{
931	xptr_t offset_xp;
932	xptr_t lock_xp;
933	xptr_t size_xp;
934	cxy_t file_cxy;
935	vfs_file_t * file_ptr;
936	vfs_inode_t * inode_ptr;
937	uint32_t new;
938
939	// check arguments
940	assert( (file_xp != XPTR_NULL) , "file_xp == XPTR_NULL" );
941	assert( (new_offset != NULL ) , "new_offset == NULL" );
942
943	// get cluster and local pointer on remote file descriptor
944	file_cxy = GET_CXY( file_xp );
945	file_ptr = GET_PTR( file_xp );
946
947	// get local pointer on remote inode
948	inode_ptr = (vfs_inode_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
949
950	// build extended pointers on lock, offset and size
951	offset_xp = XPTR( file_cxy , &file_ptr->offset );
952	lock_xp = XPTR( file_cxy , &file_ptr->lock );
953	size_xp = XPTR( file_cxy , &inode_ptr->size );
954
955	// take file descriptor lock
956	remote_rwlock_wr_acquire( lock_xp );
957
958	if ( whence == SEEK_CUR ) // new = current + offset
959	{
960	new = hal_remote_l32( offset_xp ) + offset;
961	}
962	else if ( whence == SEEK_SET ) // new = offset
963	{
964	new = offset;
965	}
966	else if ( whence == SEEK_END ) // new = size + offset
967	{
968	new = hal_remote_l32( size_xp ) + offset;
969	}
970	else
971	{
972	printk("\n[ERROR] in %s : illegal whence value\n", __FUNCTION__ );
973	remote_rwlock_wr_release( lock_xp );
974	return -1;
975	}
976
977	#if DEBUG_VFS_LSEEK
978	uint32_t cycle = (uint32_t)hal_get_cycles();
979	thread_t * this = CURRENT_THREAD;
980	char name[CONFIG_VFS_MAX_NAME_LENGTH];
981	vfs_inode_get_name( XPTR( file_cxy , inode_ptr ) , name );
982	if( cycle > DEBUG_VFS_LSEEK )
983	printk("\n[%s] thread[%x,%x] for <%s> / new offset %d / cycle %d\n",
984	__FUNCTION__ , this->process->pid, this->trdid, name, new, cycle );
985	#endif
986
987	// set new offset
988	hal_remote_s32( offset_xp , new );
989
990	// release file descriptor lock
991	remote_rwlock_wr_release( lock_xp );
992
993	// success
994	*new_offset = new;
995	return 0;
996
997	} // vfs_lseek()
998
999	////////////////////////////////////
1000	error_t vfs_close( xptr_t file_xp,
1001	uint32_t file_id )
1002	{
1003	cxy_t file_cxy; // cluster containing the file descriptor.
1004	vfs_file_t * file_ptr; // local ponter on file descriptor
1005	cxy_t owner_cxy; // process owner cluster
1006	pid_t pid; // process identifier
1007	lpid_t lpid; // process local index
1008	xptr_t root_xp; // root of xlist (processes , or dentries)
1009	xptr_t lock_xp; // lock protecting the xlist
1010	xptr_t iter_xp; // iterator on xlist
1011	mapper_t * mapper_ptr; // local pointer on associated mapper
1012	vfs_inode_t * inode_ptr; // local pointer on associated inode
1013	uint32_t size; // current file size (from inode descriptor)
1014	error_t error;
1015
1016	char name[CONFIG_VFS_MAX_NAME_LENGTH]; // file name
1017
1018	// check argument
1019	assert( (file_xp != XPTR_NULL) , "file_xp is XPTR_NULL" );
1020
1021	thread_t * this = CURRENT_THREAD;
1022	process_t * process = this->process;
1023	cluster_t * cluster = LOCAL_CLUSTER;
1024
1025	// get file name
1026	vfs_file_get_name( file_xp , name );
1027
1028	#if DEBUG_VFS_CLOSE
1029	uint32_t cycle = (uint32_t)hal_get_cycles();
1030	if( DEBUG_VFS_CLOSE < cycle )
1031	printk("\n[%s] thread[%x,%x] enter for <%s> / cycle %d\n",
1032	__FUNCTION__, process->pid, this->trdid, name, cycle );
1033	#endif
1034
1035	// get cluster and local pointer on remote file descriptor
1036	file_cxy = GET_CXY( file_xp );
1037	file_ptr = GET_PTR( file_xp );
1038
1039	//////// 1) update all dirty pages from mapper to device
1040
1041	// get local pointer on mapper associated to file
1042	mapper_ptr = hal_remote_lpt( XPTR( file_cxy , &file_ptr->mapper ) );
1043
1044	// copy all dirty pages from mapper to device
1045	if( file_cxy == local_cxy )
1046	{
1047	error = mapper_sync( mapper_ptr );
1048	}
1049	else
1050	{
1051	rpc_mapper_sync_client( file_cxy,
1052	mapper_ptr,
1053	&error );
1054	}
1055
1056	if( error )
1057	{
1058	printk("\n[ERROR] in %s : cannot synchronise dirty pages for <%s>\n",
1059	__FUNCTION__, name );
1060	return -1;
1061	}
1062
1063	#if DEBUG_VFS_CLOSE
1064	if( DEBUG_VFS_CLOSE < cycle )
1065	printk("\n[%s] thread[%x,%x] synchronised mapper of <%s> to device\n",
1066	__FUNCTION__, process->pid, this->trdid, name );
1067	#endif
1068
1069	//////// 2) update file size in all parent directory mapper(s) and update device
1070
1071	// get local pointer on remote inode
1072	inode_ptr = hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
1073
1074	// get file size from remote inode
1075	size = hal_remote_l32( XPTR( file_cxy , &inode_ptr->size ) );
1076
1077	// get root of list of parents dentry
1078	root_xp = XPTR( file_cxy , &inode_ptr->parents );
1079
1080	// loop on all parents
1081	XLIST_FOREACH( root_xp , iter_xp )
1082	{
1083	// get pointers on parent directory dentry
1084	xptr_t parent_dentry_xp = XLIST_ELEMENT( iter_xp , vfs_dentry_t , parents );
1085	cxy_t parent_cxy = GET_CXY( parent_dentry_xp );
1086	vfs_dentry_t * parent_dentry_ptr = GET_PTR( parent_dentry_xp );
1087
1088	// get local pointer on parent directory inode
1089	vfs_inode_t * parent_inode_ptr = hal_remote_lpt( XPTR( parent_cxy,
1090	&parent_dentry_ptr->parent ) );
1091
1092	// get local pointer on parent directory mapper
1093	mapper_t * parent_mapper_ptr = hal_remote_lpt( XPTR( parent_cxy,
1094	&parent_inode_ptr->mapper ) );
1095
1096	// update dentry size in parent directory mapper
1097	if( parent_cxy == local_cxy )
1098	{
1099	error = vfs_fs_update_dentry( parent_inode_ptr,
1100	parent_dentry_ptr,
1101	size );
1102	}
1103	else
1104	{
1105	rpc_vfs_fs_update_dentry_client( parent_cxy,
1106	parent_inode_ptr,
1107	parent_dentry_ptr,
1108	size,
1109	&error );
1110	}
1111
1112	if( error )
1113	{
1114	printk("\n[ERROR] in %s : cannot update size in parent\n",
1115	__FUNCTION__ );
1116	return -1;
1117	}
1118
1119	#if DEBUG_VFS_CLOSE
1120	char parent_name[CONFIG_VFS_MAX_NAME_LENGTH];
1121	vfs_inode_get_name( XPTR( parent_cxy , parent_inode_ptr ) , parent_name );
1122	if( DEBUG_VFS_CLOSE < cycle )
1123	printk("\n[%s] thread[%x,%x] updated <%s> in <%s> / size = %d bytes\n",
1124	__FUNCTION__, process->pid, this->trdid, name, parent_name, size );
1125	#endif
1126
1127	// copy all dirty pages from parent mapper to device
1128	if( parent_cxy == local_cxy )
1129	{
1130	error = mapper_sync( parent_mapper_ptr );
1131	}
1132	else
1133	{
1134	rpc_mapper_sync_client( parent_cxy,
1135	parent_mapper_ptr,
1136	&error );
1137	}
1138
1139	if( error )
1140	{
1141	printk("\n[ERROR] in %s : cannot synchronise parent mapper to device\n",
1142	__FUNCTION__ );
1143	return -1;
1144	}
1145
1146	#if DEBUG_VFS_CLOSE
1147	if( DEBUG_VFS_CLOSE < cycle )
1148	printk("\n[%s] thread[%x,%x] synchonized mapper of parent <%s> to device\n",
1149	__FUNCTION__, process->pid, this->trdid, parent_name );
1150	#endif
1151
1152	}
1153
1154	//////// 3) loop on the process copies to reset all fd_array[file_id] entries
1155
1156	// get owner process cluster and lpid
1157	pid = process->pid;
1158	owner_cxy = CXY_FROM_PID( pid );
1159	lpid = LPID_FROM_PID( pid );
1160
1161	// get extended pointers on copies root and lock
1162	root_xp = XPTR( owner_cxy , &cluster->pmgr.copies_root[lpid] );
1163	lock_xp = XPTR( owner_cxy , &cluster->pmgr.copies_lock[lpid] );
1164
1165	// take the lock protecting the list of copies
1166	remote_queuelock_acquire( lock_xp );
1167
1168	XLIST_FOREACH( root_xp , iter_xp )
1169	{
1170	xptr_t process_xp = XLIST_ELEMENT( iter_xp , process_t , copies_list );
1171	cxy_t process_cxy = GET_CXY( process_xp );
1172	process_t * process_ptr = GET_PTR( process_xp );
1173
1174	xptr_t entry_xp = XPTR( process_cxy , &process_ptr->fd_array.array[file_id] );
1175	hal_remote_s64( entry_xp , XPTR_NULL );
1176	vfs_file_count_down( file_xp );
1177	hal_fence();
1178	}
1179
1180	// release the lock protecting the list of copies
1181	remote_queuelock_release( lock_xp );
1182
1183	#if DEBUG_VFS_CLOSE
1184	if( DEBUG_VFS_CLOSE < cycle )
1185	printk("\n[%s] thread[%x,%x] reset all fd-array copies for <%s>\n",
1186	__FUNCTION__, process->pid, this->trdid, name );
1187	#endif
1188
1189	//////// 4) release memory allocated to file descriptor in remote cluster
1190
1191	if( file_cxy == local_cxy ) // file cluster is local
1192	{
1193	vfs_file_destroy( file_ptr );
1194	}
1195	else // file cluster is local
1196	{
1197	rpc_vfs_file_destroy_client( file_cxy , file_ptr );
1198	}
1199
1200	#if DEBUG_VFS_CLOSE
1201	cycle = (uint32_t)hal_get_cycles();
1202	if( DEBUG_VFS_CLOSE < cycle )
1203	printk("\n[%s] thread[%x,%x] exit / closed <%s> in process %x / cycle %d\n",
1204	__FUNCTION__, process->pid, this->trdid, name, process->pid, cycle );
1205	#endif
1206
1207	return 0;
1208
1209	} // end vfs_close()
1210
1211	////////////////////////////////////
1212	error_t vfs_mkdir( xptr_t root_xp,
1213	char * path,
1214	uint32_t rights )
1215	{
1216	error_t error;
1217	xptr_t vfs_root_xp; // extended pointer on VFS root inode
1218	vfs_inode_t * vfs_root_ptr; // local pointer on VFS root inode
1219	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
1220	xptr_t lock_xp; // extended pointer on lock protecting Inode Tree
1221	xptr_t inode_xp; // extended pointer on new directory inode
1222	vfs_inode_t * inode_ptr; // local pointer on new directory inode
1223	cxy_t inode_cxy; // new directory inode cluster identifier
1224	xptr_t dentry_xp; // extended pointer on new dentry
1225	vfs_dentry_t * dentry_ptr; // new dentry local pointer
1226	xptr_t parent_xp; // extended pointer on parent inode
1227	vfs_inode_t * parent_ptr; // local pointer on parent inode
1228	cxy_t parent_cxy; // parent inode cluster identifier
1229	vfs_ctx_t * parent_ctx_ptr; // local pointer on parent inode context
1230	uint32_t parent_fs_type; // parent inode file system type
1231
1232	xptr_t parents_root_xp; // extended pointer on parents field in inode (root)
1233	xptr_t parents_entry_xp; // extended pointer on parents field in dentry
1234	xptr_t children_xhtab_xp; // extended pointer on children field in inode (root)
1235	xptr_t children_entry_xp; // extended pointer on children field in dentry
1236
1237	char last_name[CONFIG_VFS_MAX_NAME_LENGTH];
1238
1239	thread_t * this = CURRENT_THREAD;
1240	process_t * process = this->process;
1241
1242	#if DEBUG_VFS_MKDIR
1243	char root_name[CONFIG_VFS_MAX_NAME_LENGTH];
1244	vfs_inode_get_name( root_xp , root_name );
1245	uint32_t cycle = (uint32_t)hal_get_cycles();
1246	if( DEBUG_VFS_MKDIR < cycle )
1247	printk("\n[%s] thread[%x,%x] enter / root <%s> / path <%s> / cycle %d\n",
1248	__FUNCTION__, process->pid, this->trdid, root_name, path, cycle );
1249	#endif
1250
1251	// build extended pointer on lock protecting Inode Tree (in VFS root inode)
1252	vfs_root_xp = process->vfs_root_xp;
1253	vfs_root_ptr = GET_PTR( vfs_root_xp );
1254	vfs_root_cxy = GET_CXY( vfs_root_xp );
1255	lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
1256
1257	// take the lock protecting Inode Tree in write mode
1258	remote_rwlock_wr_acquire( lock_xp );
1259
1260	// 1. get pointers on parent inode
1261	error = vfs_lookup( root_xp,
1262	path,
1263	VFS_LOOKUP_DIR \| VFS_LOOKUP_PARENT,
1264	&parent_xp,
1265	last_name );
1266	if( error )
1267	{
1268	remote_rwlock_wr_release( lock_xp );
1269	printk("\n[ERROR] in %s : cannot get parent inode for <%s>\n",
1270	__FUNCTION__, path );
1271	return -1;
1272	}
1273
1274	// get parent inode cluster and local pointer
1275	parent_cxy = GET_CXY( parent_xp );
1276	parent_ptr = GET_PTR( parent_xp );
1277
1278	#if( DEBUG_VFS_MKDIR & 1 )
1279	if( DEBUG_VFS_MKDIR < cycle )
1280	printk("\n[%s] thread[%x,%x] get parent inode (%x,%x) for <%s>\n",
1281	__FUNCTION__, process->pid, this->trdid, parent_cxy, parent_ptr, path );
1282	#endif
1283
1284	// get parent inode context, and FS type
1285	parent_ctx_ptr = hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->ctx ) );
1286	parent_fs_type = hal_remote_l32( XPTR( parent_cxy , &parent_ctx_ptr->type ) );
1287
1288	// 2. create one new dentry in parent cluster
1289	if( parent_cxy == local_cxy )
1290	{
1291	error = vfs_dentry_create( parent_fs_type,
1292	last_name,
1293	&dentry_xp );
1294	}
1295	else
1296	{
1297	rpc_vfs_dentry_create_client( parent_cxy,
1298	parent_fs_type,
1299	last_name,
1300	&dentry_xp,
1301	&error );
1302	}
1303
1304	if( error )
1305	{
1306	remote_rwlock_wr_release( lock_xp );
1307	printk("\n[ERROR] in %s : cannot create new dentry in cluster %x for <%s>\n",
1308	__FUNCTION__, parent_cxy, path );
1309	return -1;
1310	}
1311
1312	// get local pointer on dentry
1313	dentry_ptr = GET_PTR( dentry_xp );
1314
1315	#if( DEBUG_VFS_MKDIR & 1 )
1316	if( DEBUG_VFS_MKDIR < cycle )
1317	printk("\n[%s] thread[%x,%x] created new dentry (%x,%x) for <%s>\n",
1318	__FUNCTION__, process->pid, this->trdid, parent_cxy, dentry_ptr, path );
1319	#endif
1320
1321	// 3. create new directory inode
1322	// TODO : define attr / uid / gid
1323	uint32_t attr = 0;
1324	uint32_t uid = 0;
1325	uint32_t gid = 0;
1326
1327	// select a target cluster for new inode
1328	inode_cxy = cluster_random_select();
1329
1330	if( inode_cxy == local_cxy ) // target cluster is local
1331	{
1332	error = vfs_inode_create( parent_fs_type,
1333	attr,
1334	rights,
1335	uid,
1336	gid,
1337	&inode_xp );
1338	}
1339	else // target cluster is remote
1340	{
1341	rpc_vfs_inode_create_client( inode_cxy,
1342	parent_fs_type,
1343	attr,
1344	rights,
1345	uid,
1346	gid,
1347	&inode_xp,
1348	&error );
1349	}
1350
1351	if( error )
1352	{
1353	remote_rwlock_wr_release( lock_xp );
1354	printk("\n[ERROR] in %s : cannot create new inode in cluster %x for <%s>\n",
1355	__FUNCTION__ , inode_cxy , path );
1356	if( parent_cxy == local_cxy ) vfs_dentry_destroy( dentry_ptr );
1357	else rpc_vfs_dentry_destroy_client( parent_cxy , dentry_ptr );
1358	return -1;
1359	}
1360
1361	// get new inode local pointer
1362	inode_ptr = GET_PTR( inode_xp );
1363
1364	// update inode "type" field
1365	hal_remote_s32( XPTR( inode_cxy , &inode_ptr->type ) , INODE_TYPE_DIR );
1366
1367	#if(DEBUG_VFS_MKDIR & 1)
1368	if( DEBUG_VFS_MKDIR < cycle )
1369	printk("\n[%s] thread[%x,%x] created new inode (%x,%x) for <%s>\n",
1370	__FUNCTION__ , process->pid, this->trdid, inode_cxy, inode_ptr, path );
1371	#endif
1372
1373	// 4. register dentry in new inode list of parents
1374	parents_root_xp = XPTR( inode_cxy , &inode_ptr->parents );
1375	parents_entry_xp = XPTR( parent_cxy , &dentry_ptr->parents );
1376	xlist_add_first( parents_root_xp , parents_entry_xp );
1377	hal_remote_atomic_add( XPTR( inode_cxy , &inode_ptr->links ) , 1 );
1378
1379	// 5. register dentry in parent inode
1380	children_xhtab_xp = XPTR( parent_cxy , &parent_ptr->children );
1381	children_entry_xp = XPTR( parent_cxy , &dentry_ptr->children );
1382	xhtab_insert( children_xhtab_xp , last_name , children_entry_xp );
1383
1384	// 6. update "parent" and "child_xp" fields in dentry
1385	hal_remote_s64( XPTR( parent_cxy , &dentry_ptr->child_xp ) , inode_xp );
1386	hal_remote_spt( XPTR( parent_cxy , &dentry_ptr->parent ) , parent_ptr );
1387
1388	#if(DEBUG_VFS_MKDIR & 1)
1389	if( DEBUG_VFS_MKDIR < cycle )
1390	printk("\n[%s] thread[%x,%x] updated Inode Tree for <%s>\n",
1391	__FUNCTION__, process->pid, this->trdid, path );
1392	#endif
1393
1394	// 7. create the two special dentries <.> and <..> in new directory
1395	// both the new directory mapper, and the Inode Tree are updated
1396	error = vfs_add_special_dentries( inode_xp,
1397	parent_xp );
1398
1399	if( error )
1400	{
1401	remote_rwlock_wr_release( lock_xp );
1402	printk("\n[ERROR] in %s : cannot create new inode in cluster %x for <%s>\n",
1403	__FUNCTION__ , inode_cxy , path );
1404	if( parent_cxy == local_cxy ) vfs_dentry_destroy( dentry_ptr );
1405	else rpc_vfs_dentry_destroy_client( parent_cxy , dentry_ptr );
1406	return -1;
1407	}
1408
1409	// release the lock protecting Inode Tree
1410	remote_rwlock_wr_release( lock_xp );
1411
1412	// 8. update parent directory mapper
1413	// and synchronize the parent directory on IOC device
1414	if (parent_cxy == local_cxy)
1415	{
1416	error = vfs_fs_add_dentry( parent_ptr,
1417	dentry_ptr );
1418	}
1419	else
1420	{
1421	rpc_vfs_fs_add_dentry_client( parent_cxy,
1422	parent_ptr,
1423	dentry_ptr,
1424	&error );
1425	}
1426
1427	if( error )
1428	{
1429	printk("\n[ERROR] in %s : cannot update parent directory for <%s>\n",
1430	__FUNCTION__, path );
1431	return -1;
1432	}
1433
1434	#if(DEBUG_VFS_MKDIR & 1)
1435	if( DEBUG_VFS_MKDIR < cycle )
1436	printk("\n[%s] thread[%x,%x] updated parent dir (mapper and IOC) for <%s>\n",
1437	__FUNCTION__, process->pid, this->trdid, path );
1438	#endif
1439
1440	return 0;
1441
1442	} // end vfs_mkdir()
1443
1444	///////////////////////////////////////
1445	error_t vfs_link( xptr_t old_root_xp,
1446	char * old_path,
1447	xptr_t new_root_xp,
1448	char * new_path )
1449	{
1450	error_t error;
1451	xptr_t vfs_root_xp; // extended pointer on VFS root inode
1452	vfs_inode_t * vfs_root_ptr; // local pointer on VFS root inode
1453	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
1454	xptr_t lock_xp; // extended pointer on lock protecting Inode Tree
1455	xptr_t inode_xp; // extended pointer on target inode
1456	vfs_inode_t * inode_ptr; // local pointer on target inode
1457	cxy_t inode_cxy; // target inode cluster identifier
1458	uint32_t inode_type; // target inode type
1459	vfs_ctx_t * inode_ctx_ptr; // local pointer on target inode context
1460	uint32_t inode_fs_type; // target inode file system type
1461	xptr_t dentry_xp; // extended pointer on new dentry
1462	vfs_dentry_t * dentry_ptr; // target dentry local pointer
1463	xptr_t new_parent_xp; // extended pointer on new parent inode
1464	vfs_inode_t * new_parent_ptr; // local pointer on new parent inode
1465	cxy_t new_parent_cxy; // new parent inode cluster identifier
1466
1467	xptr_t parents_root_xp; // extended pointer on parents field in inode (root)
1468	xptr_t parents_entry_xp; // extended pointer on parents field in dentry
1469	xptr_t children_xhtab_xp; // extended pointer on children field in inode (root)
1470	xptr_t children_entry_xp; // extended pointer on children field in dentry
1471
1472	char new_name[CONFIG_VFS_MAX_NAME_LENGTH];
1473
1474	thread_t * this = CURRENT_THREAD;
1475	process_t * process = this->process;
1476
1477	#if DEBUG_VFS_LINK
1478	char old_root_name[CONFIG_VFS_MAX_NAME_LENGTH];
1479	char new_root_name[CONFIG_VFS_MAX_NAME_LENGTH];
1480	vfs_inode_get_name( old_root_xp , old_root_name );
1481	vfs_inode_get_name( new_root_xp , new_root_name );
1482	uint32_t cycle = (uint32_t)hal_get_cycles();
1483	if( DEBUG_VFS_LINK < cycle )
1484	printk("\n[%s] thread[%x,%x] enter / old_root <%s> / old_path <%s> / "
1485	"new_root <%s> / new_path <%s> / cycle %d\n",
1486	__FUNCTION__, process->pid, this->trdid,
1487	old_root_name, old_path, new_root_name, new_path, cycle );
1488	#endif
1489
1490	// build extended pointer on lock protecting Inode Tree (in VFS root inode)
1491	vfs_root_xp = process->vfs_root_xp;
1492	vfs_root_ptr = GET_PTR( vfs_root_xp );
1493	vfs_root_cxy = GET_CXY( vfs_root_xp );
1494	lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
1495
1496	// take the lock protecting Inode Tree in write mode
1497	remote_rwlock_wr_acquire( lock_xp );
1498
1499	// get extended pointer on target inode
1500	error = vfs_lookup( old_root_xp,
1501	old_path,
1502	0,
1503	&inode_xp,
1504	NULL );
1505	if( error )
1506	{
1507	remote_rwlock_wr_release( lock_xp );
1508	printk("\n[ERROR] in %s : cannot get target inode for <%s>\n",
1509	__FUNCTION__, old_path );
1510	return -1;
1511	}
1512
1513	#if( DEBUG_VFS_LINK & 1 )
1514	if( DEBUG_VFS_LINK < cycle )
1515	printk("\n[%s] thread[%x,%x] get child inode (%x,%x) for <%s>\n",
1516	__FUNCTION__, process->pid, this->trdid,
1517	GET_CXY(inode_xp), GET_PTR(inode_xp), old_path, cycle );
1518	#endif
1519
1520	// get extended pointer on parent inode in new path
1521	error = vfs_lookup( new_root_xp,
1522	new_path,
1523	VFS_LOOKUP_PARENT,
1524	&new_parent_xp,
1525	new_name );
1526	if( error )
1527	{
1528	remote_rwlock_wr_release( lock_xp );
1529	printk("\n[ERROR] in %s : cannot get parent inode for <%s>\n",
1530	__FUNCTION__, new_path );
1531	return -1;
1532	}
1533
1534	#if( DEBUG_VFS_LINK & 1 )
1535	if( DEBUG_VFS_LINK < cycle )
1536	printk("\n[%s] thread[%x,%x] get parent inode (%x,%x) for <%s>\n",
1537	__FUNCTION__, process->pid, this->trdid,
1538	GET_CXY(new_parent_xp), GET_PTR(new_parent_xp), new_path );
1539	#endif
1540
1541	// get target inode cluster and local pointer
1542	inode_cxy = GET_CXY( inode_xp );
1543	inode_ptr = GET_PTR( inode_xp );
1544
1545	// get target inode type, context, and FS type
1546	inode_type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
1547	inode_ctx_ptr = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->ctx ) );
1548	inode_fs_type = hal_remote_l32( XPTR( inode_cxy , &inode_ctx_ptr->type ) );
1549
1550	// get new parent inode cluster an local pointer
1551	new_parent_ptr = GET_PTR( new_parent_xp );
1552	new_parent_cxy = GET_CXY( new_parent_xp );
1553
1554	///////////////////////////////////////////////////////////////////////
1555	if( (inode_type == INODE_TYPE_FILE) \|\| (inode_type == INODE_TYPE_DIR) )
1556	{
1557	// 1. create one new dentry
1558	if( new_parent_cxy == local_cxy )
1559	{
1560	error = vfs_dentry_create( inode_fs_type,
1561	new_name,
1562	&dentry_xp );
1563	}
1564	else
1565	{
1566	rpc_vfs_dentry_create_client( new_parent_cxy,
1567	inode_fs_type,
1568	new_name,
1569	&dentry_xp,
1570	&error );
1571	}
1572
1573	if( error )
1574	{
1575	remote_rwlock_wr_release( lock_xp );
1576	printk("\n[ERROR] in %s : cannot create new dentry for <%s>\n",
1577	__FUNCTION__, new_path );
1578	return -1;
1579	}
1580
1581	// get local pointer on dentry
1582	dentry_ptr = GET_PTR( dentry_xp );
1583
1584	// 2. register dentry in target inode
1585	parents_root_xp = XPTR( inode_cxy , &inode_ptr->parents );
1586	parents_entry_xp = XPTR( new_parent_cxy , &dentry_ptr->parents );
1587	xlist_add_first( parents_root_xp , parents_entry_xp );
1588	hal_remote_atomic_add( XPTR( inode_cxy , &inode_ptr->links ) , 1 );
1589
1590	// 3. register dentry in parent inode
1591	children_xhtab_xp = XPTR( new_parent_cxy , &new_parent_ptr->children );
1592	children_entry_xp = XPTR( new_parent_cxy , &dentry_ptr->children );
1593	xhtab_insert( children_xhtab_xp , new_name , children_entry_xp );
1594
1595	// 4. update "parent" and "child_xp" fields in dentry
1596	hal_remote_s64( XPTR( new_parent_cxy , &dentry_ptr->child_xp ) , inode_xp );
1597	hal_remote_spt( XPTR( new_parent_cxy , &dentry_ptr->parent ) , new_parent_ptr );
1598
1599	#if(DEBUG_VFS_LINK & 1)
1600	if( DEBUG_VFS_LINK < cycle )
1601	printk("\n[%s] thread[%x,%x] updated Inode Tree / old <%s> / new <%s>\n",
1602	__FUNCTION__, process->pid, this->trdid, old_path, new_path );
1603	vfs_display( new_parent_xp );
1604	#endif
1605
1606	// release the lock protecting Inode Tree
1607	remote_rwlock_wr_release( lock_xp );
1608
1609	// 5. update new parent directory mapper in Inode Tree
1610	// and synchronize the parent directory on IOC device
1611	if (new_parent_cxy == local_cxy)
1612	{
1613	error = vfs_fs_add_dentry( new_parent_ptr,
1614	dentry_ptr );
1615	}
1616	else
1617	{
1618	rpc_vfs_fs_add_dentry_client( new_parent_cxy,
1619	new_parent_ptr,
1620	dentry_ptr,
1621	&error );
1622	}
1623	if( error )
1624	{
1625	printk("\n[ERROR] in %s : cannot update new parent directory for <%s>\n",
1626	__FUNCTION__, new_path );
1627	return -1;
1628	}
1629
1630	#if(DEBUG_VFS_LINK & 1)
1631	if( DEBUG_VFS_LINK < cycle )
1632	printk("\n[%s] thread[%x,%x] updated new parent dir (mapper and IOC) / old <%s> / new <%s>\n",
1633	__FUNCTION__, process->pid, this->trdid, old_path, new_path );
1634	#endif
1635	return 0;
1636	}
1637	else
1638	{
1639	// release the lock protecting Inode Tree
1640	remote_rwlock_wr_release( lock_xp );
1641
1642	printk("\n[ERROR] in %s : unsupported inode type %s\n",
1643	__FUNCTION__ , vfs_inode_type_str( inode_type ) );
1644	return -1;
1645	}
1646
1647	} // end vfs_link()
1648
1649	/////////////////////////////////////
1650	error_t vfs_unlink( xptr_t root_xp,
1651	char * path )
1652	{
1653	error_t error;
1654	xptr_t vfs_root_xp; // extended pointer on VFS root inode
1655	vfs_inode_t * vfs_root_ptr; // local_pointer on VFS root inode
1656	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
1657	xptr_t lock_xp; // extended pointer on lock protecting Inode Tree
1658	xptr_t parent_xp; // extended pointer on target inode
1659	cxy_t parent_cxy; // target inode cluster identifier
1660	vfs_inode_t * parent_ptr; // target inode local pointer
1661	xptr_t inode_xp; // extended pointer on target inode
1662	cxy_t inode_cxy; // target inode cluster identifier
1663	vfs_inode_t * inode_ptr; // target inode local pointer
1664	uint32_t inode_links; // target inode links count
1665	vfs_inode_type_t inode_type; // target inode type
1666	uint32_t inode_children; // target inode number of children
1667	xptr_t dentry_xp; // extended pointer on dentry to unlink
1668	vfs_dentry_t * dentry_ptr; // local pointer on dentry to unlink
1669	vfs_ctx_t * ctx_ptr; // local pointer on FS context
1670	vfs_fs_type_t fs_type; // File system type
1671
1672	char name[CONFIG_VFS_MAX_NAME_LENGTH]; // name of link to remove
1673
1674	thread_t * this = CURRENT_THREAD;
1675	process_t * process = this->process;
1676
1677	#if DEBUG_VFS_UNLINK
1678	uint32_t cycle = (uint32_t)hal_get_cycles();
1679	char root_name[CONFIG_VFS_MAX_NAME_LENGTH];
1680	vfs_inode_get_name( root_xp , root_name );
1681	if( DEBUG_VFS_UNLINK < cycle )
1682	printk("\n[%s] thread[%x,%x] : enter for root <%s> / path <%s> / cycle %d\n",
1683	__FUNCTION__, process->pid, this->trdid, root_name, path, cycle );
1684	#endif
1685
1686	// build extended pointer on lock protecting Inode Tree (in VFS root inode)
1687	vfs_root_xp = process->vfs_root_xp;
1688	vfs_root_ptr = GET_PTR( vfs_root_xp );
1689	vfs_root_cxy = GET_CXY( vfs_root_xp );
1690	lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
1691
1692	// take the lock protecting Inode Tree
1693	remote_rwlock_wr_acquire( lock_xp );
1694
1695	// get extended pointer on parent inode
1696	error = vfs_lookup( root_xp,
1697	path,
1698	VFS_LOOKUP_PARENT,
1699	&parent_xp,
1700	name );
1701	if( error )
1702	{
1703	remote_rwlock_wr_release( lock_xp );
1704	printk("\n[ERROR] in %s : cannot get parent inode for <%s> in <%s>\n",
1705	__FUNCTION__, name, path );
1706	return -1;
1707	}
1708
1709	// get parent inode cluster and local pointer
1710	parent_cxy = GET_CXY( parent_xp );
1711	parent_ptr = GET_PTR( parent_xp );
1712
1713	#if( DEBUG_VFS_UNLINK & 1 )
1714	char parent_name[CONFIG_VFS_MAX_NAME_LENGTH];
1715	vfs_inode_get_name( parent_xp , parent_name );
1716	if( DEBUG_VFS_UNLINK < cycle )
1717	printk("\n[%s] thread[%x,%x] : parent inode <%s> is (%x,%x)\n",
1718	__FUNCTION__, process->pid, this->trdid, parent_name, parent_cxy, parent_ptr );
1719	#endif
1720
1721	// build extended pointer on parent inode "children" xhtab
1722	xptr_t children_xp = XPTR( parent_cxy , &parent_ptr->children );
1723
1724	// try to get extended pointer on dentry from Inode Tree
1725	dentry_xp = xhtab_lookup( children_xp , name );
1726
1727	// when dentry not found in Inode Tree, try to get it from inode tree
1728
1729	if( dentry_xp == XPTR_NULL ) // miss target dentry in Inode Tree
1730	{
1731
1732	#if( DEBUG_VFS_UNLINK & 1 )
1733	if( DEBUG_VFS_UNLINK < cycle )
1734	printk("\n[%s] thread[%x,%x] : inode <%s> not found => scan parent mapper\n",
1735	__FUNCTION__, process->pid, this->trdid, name );
1736	#endif
1737	// get parent inode FS type
1738	ctx_ptr = hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->ctx ) );
1739	fs_type = hal_remote_l32( XPTR( parent_cxy , &ctx_ptr->type ) );
1740
1741	// select a cluster for new inode
1742	inode_cxy = cluster_random_select();
1743
1744	// speculatively insert a new child dentry/inode couple in inode tree
1745	error = vfs_add_child_in_parent( inode_cxy,
1746	fs_type,
1747	parent_xp,
1748	name,
1749	&dentry_xp,
1750	&inode_xp );
1751	if( error )
1752	{
1753	printk("\n[ERROR] in %s : cannot create inode <%s> in path <%s>\n",
1754	__FUNCTION__ , name, path );
1755
1756	vfs_remove_child_from_parent( dentry_xp );
1757	return -1;
1758	}
1759
1760	// get local pointers on new dentry and new inode descriptors
1761	inode_ptr = GET_PTR( inode_xp );
1762	dentry_ptr = GET_PTR( dentry_xp );
1763
1764	// scan parent mapper to find the missing dentry, and complete
1765	// initialisation of new dentry and new inode descriptors In Inode Tree
1766	if( parent_cxy == local_cxy )
1767	{
1768	error = vfs_fs_new_dentry( parent_ptr,
1769	name,
1770	inode_xp );
1771	}
1772	else
1773	{
1774	rpc_vfs_fs_new_dentry_client( parent_cxy,
1775	parent_ptr,
1776	name,
1777	inode_xp,
1778	&error );
1779	}
1780
1781	if ( error ) // dentry not found in parent mapper
1782	{
1783	printk("\n[ERROR] in %s : cannot get dentry <%s> in path <%s>\n",
1784	__FUNCTION__ , name, path );
1785	return -1;
1786	}
1787
1788	#if (DEBUG_VFS_UNLINK & 1)
1789	if( DEBUG_VFS_UNLINK < cycle )
1790	printk("\n[%s] thread[%x,%x] : created missing inode & dentry <%s> in cluster %x\n",
1791	__FUNCTION__, process->pid, this->trdid, name, inode_cxy );
1792	#endif
1793
1794	}
1795	else // found target dentry in Inode Tree
1796	{
1797	dentry_ptr = GET_PTR( dentry_xp );
1798
1799	// get pointer on target inode from dentry
1800	inode_xp = hal_remote_l64( XPTR( parent_cxy , &dentry_ptr->child_xp ) );
1801	inode_cxy = GET_CXY( inode_xp );
1802	inode_ptr = GET_PTR( inode_xp );
1803	}
1804
1805	// At this point the Inode Tree contains the target dentry and child inode
1806	// we can safely remove this dentry from both the parent mapper, and the Inode Tree.
1807
1808	#if( DEBUG_VFS_UNLINK & 1 )
1809	if( DEBUG_VFS_UNLINK < cycle )
1810	printk("\n[%s] thread[%x,%x] : dentry (%x,%x) / inode (%x,%x)\n",
1811	__FUNCTION__, process->pid, this->trdid, parent_cxy, dentry_ptr, inode_cxy, inode_ptr );
1812	#endif
1813
1814	// get target inode "type" and "links"
1815	inode_type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
1816	inode_links = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->links ) );
1817
1818	///////////////////////////////////////////////////////////////////////
1819	if( (inode_type == INODE_TYPE_FILE) \|\| (inode_type == INODE_TYPE_DIR) )
1820	{
1821
1822	#if( DEBUG_VFS_UNLINK & 1 )
1823	if( DEBUG_VFS_UNLINK < cycle )
1824	printk("\n[%s] thread[%x,%x] : unlink inode <%s> / type %s / %d links\n",
1825	__FUNCTION__, process->pid, this->trdid, name, vfs_inode_type_str(inode_type), inode_links );
1826	#endif
1827
1828	// 1. Release clusters allocated to target inode
1829	// and synchronize the FAT on IOC device if last link.
1830	if( inode_links == 1 )
1831	{
1832	// build extended pointer on target inode "children" number
1833	xptr_t inode_children_xp = XPTR( inode_cxy , &inode_ptr->children.items );
1834
1835	// get target inode number of children
1836	inode_children = hal_remote_l32( inode_children_xp );
1837
1838	// check no children
1839	if( inode_children != 0 )
1840	{
1841	remote_rwlock_wr_release( lock_xp );
1842	printk("\n[ERROR] in %s : cannot remove <%s> inode that has children\n",
1843	__FUNCTION__, path );
1844	return -1;
1845	}
1846
1847	// release clusters on IOC device
1848	error = vfs_fs_release_inode( inode_xp );
1849
1850	if( error )
1851	{
1852	remote_rwlock_wr_release( lock_xp );
1853	printk("\n[ERROR] in %s : cannot update FAT mapper to remove <%s> inode\n",
1854	__FUNCTION__ , path );
1855	return -1;
1856	}
1857
1858	#if(DEBUG_VFS_UNLINK & 1)
1859	if( DEBUG_VFS_UNLINK < cycle )
1860	printk("\n[%s] thread[%x,%x] removed <%s> inode from FAT (mapper and IOC device)\n",
1861	__FUNCTION__, process->pid, this->trdid, path );
1862	#endif
1863	}
1864
1865	// 2. update parent directory mapper
1866	// and synchronize the parent directory on IOC device
1867	if (parent_cxy == local_cxy)
1868	{
1869	error = vfs_fs_remove_dentry( parent_ptr,
1870	dentry_ptr );
1871	}
1872	else
1873	{
1874	rpc_vfs_fs_remove_dentry_client( parent_cxy,
1875	parent_ptr,
1876	dentry_ptr,
1877	&error );
1878	}
1879
1880	if( error )
1881	{
1882	remote_rwlock_wr_release( lock_xp );
1883	printk("\n[ERROR] in %s : cannot update dentry on device for <%s>\n",
1884	__FUNCTION__ , path );
1885	return -1;
1886	}
1887
1888	#if(DEBUG_VFS_UNLINK & 1)
1889	if( DEBUG_VFS_UNLINK < cycle )
1890	printk("\n[%s] thread[%x,%x] removed <%s> inode from parent dir (mapper and IOC device)\n",
1891	__FUNCTION__, process->pid, this->trdid, path );
1892	#endif
1893	// 3. remove dentry from Inode Tree (and associated chils inode when last link)
1894	vfs_remove_child_from_parent( dentry_xp );
1895
1896	// release the lock protecting Inode Tree
1897	remote_rwlock_wr_release( lock_xp );
1898
1899	#if DEBUG_VFS_UNLINK
1900	if( DEBUG_VFS_UNLINK < cycle )
1901	printk("\n[%s] thread[%x,%x] exit / removed <%s> inode from Inode Tree / cycle %d\n",
1902	__FUNCTION__, process->pid, this->trdid, path, cycle );
1903	#endif
1904	return 0;
1905	}
1906	else
1907	{
1908	remote_rwlock_wr_release( lock_xp );
1909	printk("\n[ERROR] in %s : unsupported inode type %s\n",
1910	__FUNCTION__ , vfs_inode_type_str( inode_type ) );
1911	return -1;
1912	}
1913
1914	} // end vfs_unlink()
1915
1916	////////////////////////////////////////////////
1917	error_t vfs_stat( xptr_t root_inode_xp,
1918	char * path,
1919	struct stat * st )
1920	{
1921	error_t error;
1922	xptr_t inode_xp; // extended pointer on target inode
1923	vfs_inode_t * inode_ptr; // local pointer on target inode
1924	cxy_t inode_cxy; // target inode cluster identifier
1925	xptr_t vfs_root_xp; // extended pointer on VFS root inode
1926	vfs_inode_t * vfs_root_ptr; // local_pointer on VFS root inode
1927	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
1928	xptr_t lock_xp; // extended pointer on lock protecting Inode Tree
1929
1930	thread_t * this = CURRENT_THREAD;
1931	process_t * process = this->process;
1932
1933	// build extended pointer on lock protecting Inode Tree (in VFS root inode)
1934	vfs_root_xp = process->vfs_root_xp;
1935	vfs_root_ptr = GET_PTR( vfs_root_xp );
1936	vfs_root_cxy = GET_CXY( vfs_root_xp );
1937	lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
1938
1939	// get the lock protecting Inode Tree in read mode
1940	remote_rwlock_rd_acquire( lock_xp );
1941
1942	// get extended pointer on target inode
1943	error = vfs_lookup( root_inode_xp,
1944	path,
1945	0,
1946	&inode_xp,
1947	NULL );
1948
1949	// release the lock protecting Inode Tree
1950	remote_rwlock_rd_release( lock_xp );
1951
1952	if( error )
1953	{
1954	printk("\n[ERROR] in %s : cannot found inode <%s>\n",
1955	__FUNCTION__ , path );
1956	return -1;
1957	}
1958
1959	// get cluster and local pointer on inode descriptor
1960	inode_ptr = GET_PTR( inode_xp );
1961	inode_cxy = GET_CXY( inode_xp );
1962
1963	// get relevant infos from inode descriptor
1964	uint32_t inum = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->inum ) );
1965	uint32_t size = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->size ) );
1966	uint32_t uid = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->uid ) );
1967	uint32_t gid = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->gid ) );
1968	uint32_t type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
1969	uint32_t rights = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->rights ) );
1970
1971	// set stat structure fields
1972	st->st_ino = inum;
1973	st->st_gid = gid;
1974	st->st_uid = uid;
1975	st->st_size = size;
1976	st->st_mode = (type << 16) \| rights;
1977
1978	#if DEBUG_VFS_STAT
1979	uint32_t cycle = (uint32_t)hal_get_cycles();
1980	if( DEBUG_VFS_STAT < cycle )
1981	printk("\n[%s] thread[%x,%x] set stat %x for inode %x in cluster %x / cycle %d\n"
1982	" %s / inum %d / size %d\n",
1983	__FUNCTION__, process->pid, this->trdid, st, inode_ptr, inode_cxy, cycle,
1984	vfs_inode_type_str( type ), inum, size );
1985	#endif
1986
1987	return 0;
1988
1989	} // end vfs_stat()
1990
1991	////////////////////////////////////
1992	error_t vfs_chdir( xptr_t root_xp,
1993	char * path )
1994	{
1995	error_t error;
1996	xptr_t inode_xp; // extended pointer on target inode
1997	cxy_t inode_cxy; // target inode cluster identifier
1998	vfs_inode_t * inode_ptr; // target inode local pointer
1999	vfs_inode_type_t inode_type; // target inode type
2000	xptr_t vfs_root_xp; // extended pointer on VFS root inode
2001	vfs_inode_t * vfs_root_ptr; // local_pointer on VFS root inode
2002	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
2003	xptr_t main_lock_xp; // extended pointer on lock protecting Inode Tree
2004	xptr_t ref_xp; // extended pointer on reference process
2005	process_t * ref_ptr; // local pointer on reference process
2006	cxy_t ref_cxy; // reference process cluster
2007	xptr_t cwd_lock_xp; // extended pointer on lock protecting CWD change
2008	xptr_t cwd_xp_xp; // extended pointer on cwd_xp in reference process
2009
2010	thread_t * this = CURRENT_THREAD;
2011	process_t * process = this->process;
2012
2013	#if DEBUG_VFS_CHDIR
2014	uint32_t cycle = (uint32_t)hal_get_cycles();
2015	if( DEBUG_VFS_CHDIR < cycle )
2016	printk("\n[%s] thread[%x,%x] enter for path <%s> / cycle %d\n",
2017	__FUNCTION__, process->pid, this->trdid, path, cycle );
2018	#endif
2019
2020	// build extended pointer on lock protecting Inode Tree (in VFS root inode)
2021	vfs_root_xp = process->vfs_root_xp;
2022	vfs_root_ptr = GET_PTR( vfs_root_xp );
2023	vfs_root_cxy = GET_CXY( vfs_root_xp );
2024	main_lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
2025
2026	// take lock protecting Inode Tree in read mode
2027	remote_rwlock_rd_acquire( main_lock_xp );
2028
2029	// get extended pointer on target inode
2030	error = vfs_lookup( root_xp,
2031	path,
2032	VFS_LOOKUP_DIR,
2033	&inode_xp,
2034	NULL );
2035
2036	// release lock protecting Inode Tree in read mode
2037	remote_rwlock_rd_release( main_lock_xp );
2038
2039	if( error )
2040	{
2041	printk("\n[ERROR] in %s : <%s> not found\n",
2042	__FUNCTION__, path );
2043	return -1;
2044	}
2045
2046	// get inode type from remote file
2047	inode_cxy = GET_CXY( inode_xp );
2048	inode_ptr = GET_PTR( inode_xp );
2049	inode_type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
2050
2051	if( inode_type != INODE_TYPE_DIR )
2052	{
2053	printk("\n[ERROR] in %s : <%s> is not a directory\n",
2054	__FUNCTION__, path );
2055	return -1;
2056	}
2057
2058	// build extended pointer on cwd_lock and cwd_xp
2059	ref_xp = process->ref_xp;
2060	ref_ptr = GET_PTR( ref_xp );
2061	ref_cxy = GET_CXY( ref_xp );
2062	cwd_lock_xp = XPTR( ref_cxy , &ref_ptr->cwd_lock );
2063	cwd_xp_xp = XPTR( ref_cxy , &ref_ptr->cwd_xp );
2064
2065	// take lock protecting CWD changes
2066	remote_busylock_acquire( cwd_lock_xp );
2067
2068	// update cwd_xp field in reference process descriptor
2069	hal_remote_s64( cwd_xp_xp , inode_xp );
2070
2071	// release lock protecting CWD changes
2072	remote_busylock_release( cwd_lock_xp );
2073
2074	#if DEBUG_VFS_CHDIR
2075	cycle = (uint32_t)hal_get_cycles();
2076	if( DEBUG_VFS_CHDIR < cycle )
2077	printk("\n[%s] thread[%x,%x] exit : inode (%x,%x) / &cwd_xp (%x,%x) / cycle %d\n",
2078	__FUNCTION__, process->pid, this->trdid, inode_cxy, inode_ptr,
2079	GET_CXY(cwd_xp_xp), GET_PTR(cwd_xp_xp), cycle );
2080	#endif
2081
2082	return 0;
2083
2084	} // end vfs_chdir()
2085
2086	///////////////////////////////////
2087	error_t vfs_chmod( xptr_t cwd_xp,
2088	char * path,
2089	uint32_t rights )
2090	{
2091	error_t error;
2092	xptr_t inode_xp; // extended pointer on target inode
2093	cxy_t inode_cxy; // inode cluster identifier
2094	vfs_inode_t * inode_ptr; // inode local pointer
2095
2096	// check lookup working mode
2097	assert( (rights == 0), "access rights non implemented yet" );
2098
2099	// get extended pointer on target inode
2100	error = vfs_lookup( cwd_xp,
2101	path,
2102	0,
2103	&inode_xp,
2104	NULL );
2105
2106	if( error ) return error;
2107
2108	// get inode cluster and local pointer
2109	inode_cxy = GET_CXY( inode_xp );
2110	inode_ptr = GET_PTR( inode_xp );
2111
2112	// get inode type from remote inode
2113	// inode_type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
2114
2115	// TODO finalize implementation
2116
2117	assert( false , "not implemented" );
2118
2119	// set inode rights in remote inode
2120	hal_remote_s32( XPTR( inode_cxy , &inode_ptr->rights ) , rights );
2121
2122	return 0;
2123	}
2124
2125	///////////////////////////////////
2126	error_t vfs_mkfifo( xptr_t cwd_xp,
2127	char * path,
2128	uint32_t rights )
2129	{
2130	assert( false , "not implemented %l %x %x", cwd_xp, path, rights );
2131	return 0;
2132	}
2133
2134
2135
2136	//////////////////////////////////////////////////////////////////////////////////////////
2137	// Distributed Inode Tree access related functions
2138	//////////////////////////////////////////////////////////////////////////////////////////
2139
2140	//////////////////////////////////////////////////////////////////////////
2141	// This static function is called by the vfs_display() function.
2142	// that is supposed to take the TXT0 lock.
2143	//////////////////////////////////////////////////////////////////////////
2144	static void vfs_recursive_display( xptr_t inode_xp,
2145	xptr_t name_xp,
2146	uint32_t indent )
2147	{
2148	cxy_t inode_cxy;
2149	vfs_inode_t * inode_ptr;
2150	vfs_inode_type_t inode_type;
2151	uint32_t inode_size;
2152	uint32_t inode_attr;
2153	uint32_t inode_dirty;
2154	void * inode_extd;
2155
2156	xptr_t children_xp; // extended pointer on children xhtab
2157
2158	xptr_t child_dentry_xp;
2159	cxy_t child_dentry_cxy;
2160	vfs_dentry_t * child_dentry_ptr;
2161	xptr_t child_inode_xp;
2162	xptr_t child_dentry_name_xp;
2163	mapper_t * mapper_ptr;
2164
2165	char name[CONFIG_VFS_MAX_NAME_LENGTH];
2166
2167	char * indent_str[] = { "", // level 0
2168	" ", // level 1
2169	" ", // level 2
2170	" ", // level 3
2171	" ", // level 4
2172	" ", // level 5
2173	" ", // level 6
2174	" ", // level 7
2175	" ", // level 8
2176	" ", // level 9
2177	" ", // level 10
2178	" ", // level 11
2179	" ", // level 12
2180	" ", // level 13
2181	" ", // level 14
2182	" " }; // level 15
2183
2184	assert( (inode_xp != XPTR_NULL) , "inode_xp cannot be NULL" );
2185	assert( (name_xp != XPTR_NULL) , "name_xp cannot be NULL" );
2186	assert( (indent < 16) , "depth cannot be larger than 15" );
2187
2188	// get current inode cluster and local pointer
2189	inode_cxy = GET_CXY( inode_xp );
2190	inode_ptr = GET_PTR( inode_xp );
2191
2192	// get inode type, size, attr, mapper, and inum
2193	inode_type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
2194	inode_size = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->size ) );
2195	inode_attr = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->attr ) );
2196	inode_extd = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->extend ) );
2197	mapper_ptr = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
2198
2199	// make a local copy of node name
2200	hal_remote_strcpy( XPTR( local_cxy , name ) , name_xp );
2201
2202	// compute dirty
2203	inode_dirty = ((inode_attr & INODE_ATTR_DIRTY) != 0);
2204
2205	// display inode
2206	nolock_printk("%s<%s> : %s / extd %x / %d bytes / dirty %d / cxy %x / inode %x / mapper %x\n",
2207	indent_str[indent], name, vfs_inode_type_str( inode_type ), (uint32_t)inode_extd,
2208	inode_size, inode_dirty, inode_cxy, inode_ptr, mapper_ptr );
2209
2210	// scan directory entries when current inode is a directory
2211	// don't scan the the "." and ".." directories to break loops
2212	if( (inode_type == INODE_TYPE_DIR) &&
2213	(strcmp( name , "." ) != 0) &&
2214	(strcmp( name , ".." ) != 0) )
2215	{
2216	// get extended pointer on directory entries xhtab
2217	children_xp = XPTR( inode_cxy , &inode_ptr->children );
2218
2219	// get xhtab lock
2220	xhtab_lock( children_xp );
2221
2222	// get first dentry from xhtab
2223	child_dentry_xp = xhtab_get_first( children_xp );
2224
2225	while( child_dentry_xp != XPTR_NULL )
2226	{
2227	// get dentry cluster and local pointer
2228	child_dentry_cxy = GET_CXY( child_dentry_xp );
2229	child_dentry_ptr = GET_PTR( child_dentry_xp );
2230
2231	// get extended pointer on child inode
2232	child_inode_xp = hal_remote_l64( XPTR( child_dentry_cxy,
2233	&child_dentry_ptr->child_xp ) );
2234
2235	// get extended pointer on dentry name
2236	child_dentry_name_xp = XPTR( child_dentry_cxy , &child_dentry_ptr->name );
2237
2238	// recursive call on inode display
2239	vfs_recursive_display( child_inode_xp,
2240	child_dentry_name_xp,
2241	indent+1 );
2242
2243	// get next dentry
2244	child_dentry_xp = xhtab_get_next( children_xp );
2245	}
2246
2247	// release xhtab lock
2248	xhtab_unlock( children_xp );
2249	}
2250	} // end vfs_recursive_display()
2251
2252	///////////////////////////////////
2253	void vfs_display( xptr_t inode_xp )
2254	{
2255	xptr_t name_xp;
2256	xptr_t dentry_xp;
2257	cxy_t dentry_cxy;
2258	vfs_dentry_t * dentry_ptr;
2259	xptr_t parents_root_xp; // root of parent dentries xlist
2260
2261	// get target inode cluster and local pointer
2262	cxy_t inode_cxy = GET_CXY( inode_xp );
2263	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
2264
2265	// build extended pointer on parents dentries root
2266	parents_root_xp = XPTR( inode_cxy , &inode_ptr->parents );
2267
2268	// check VFS root
2269	if( xlist_is_empty( parents_root_xp ) ) // inode is the VFS root
2270	{
2271	// build extended pointer on root name
2272	name_xp = XPTR( local_cxy , "/" );
2273	}
2274	else
2275	{
2276	// get first parent dentry cluster and pointers
2277	dentry_xp = XLIST_FIRST( parents_root_xp , vfs_dentry_t , parents );
2278	dentry_cxy = GET_CXY( dentry_xp );
2279	dentry_ptr = GET_PTR( dentry_xp );
2280
2281	// get extended pointer on dentry name
2282	name_xp = XPTR( dentry_cxy , &dentry_ptr->name );
2283	}
2284
2285	// get pointers on TXT0 chdev
2286	xptr_t txt0_xp = chdev_dir.txt_tx[0];
2287	cxy_t txt0_cxy = GET_CXY( txt0_xp );
2288	chdev_t * txt0_ptr = GET_PTR( txt0_xp );
2289
2290	// get extended pointer on remote TXT0 chdev lock
2291	xptr_t lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
2292
2293	// get TXT0 lock in busy waiting mode
2294	remote_busylock_acquire( lock_xp );
2295
2296	// print header
2297	nolock_printk("\n***** file system state\n\n");
2298
2299	// call recursive function
2300	vfs_recursive_display( inode_xp , name_xp , 0 );
2301
2302	// release lock
2303	remote_busylock_release( lock_xp );
2304
2305	} // end vfs_display()
2306
2307	/*
2308	//////////////////////////////////////////////////////////////////////////////////////////
2309	// This static function is used by the vfs_lookup() function.
2310	// It takes an extended pointer on a remote inode (parent directory inode),
2311	// and check access_rights violation for the calling thread.
2312	// It can be used by any thread running in any cluster.
2313	//////////////////////////////////////////////////////////////////////////////////////////
2314	// @ inode_xp : extended pointer on inode.
2315	// @ client_uid : client thread user ID
2316	// @ client_gid : client thread group ID
2317	// @ return true if access rights are violated.
2318	//////////////////////////////////////////////////////////////////////////////////////////
2319	static bool_t vfs_access_denied( xptr_t inode_xp,
2320	uint32_t client_uid,
2321	uint32_t client_gid )
2322	{
2323	// get found inode cluster and local pointer
2324	cxy_t inode_cxy = GET_CXY( inode_xp );
2325	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
2326
2327	// get inode access mode, UID, and GID
2328	// TODO uint32_t mode = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->mode ) );
2329	uid_t uid = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->uid ) );
2330	gid_t gid = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->gid ) );
2331
2332	// TODO : me must use mode
2333	if( (uid == client_uid) \|\| (gid == client_gid) ) return false;
2334	else return true;
2335	}
2336	*/
2337
2338	//////////////////////////////////////////////////////////////////////////////////////////
2339	// This static function is used by the vfs_lookup() function.
2340	// It takes an extended pointer on a remote parent directory inode, a directory
2341	// entry name, and and scan the XHTAB associated to the parent inode to find the
2342	// searched dentry. It does NOT modify the inode tree in case of miss.
2343	// It can be used by any thread running in any cluster.
2344	//////////////////////////////////////////////////////////////////////////////////////////
2345	// @ parent_xp : extended pointer on parent inode in remote cluster.
2346	// @ name : dentry name
2347	// @ child_xp : [out] buffer for extended pointer on child inode.
2348	// @ return true if success / return false if not found.
2349	//////////////////////////////////////////////////////////////////////////////////////////
2350	static bool_t vfs_get_child( xptr_t parent_xp,
2351	char * name,
2352	xptr_t * child_xp )
2353	{
2354	xptr_t xhtab_xp; // extended pointer on hash table for children dentries
2355	xptr_t dentry_xp; // extended pointer on children dentry
2356	cxy_t dentry_cxy;
2357	vfs_dentry_t * dentry_ptr;
2358
2359	// get parent inode cluster and local pointer
2360	cxy_t parent_cxy = GET_CXY( parent_xp );
2361	vfs_inode_t * parent_ptr = GET_PTR( parent_xp );
2362
2363	// get extended pointer on hash table of children directory entries
2364	xhtab_xp = XPTR( parent_cxy , &parent_ptr->children );
2365
2366	// get pointers on matching dentry
2367	dentry_xp = xhtab_lookup( xhtab_xp , name );
2368	dentry_cxy = GET_CXY( dentry_xp );
2369	dentry_ptr = GET_PTR( dentry_xp );
2370
2371	if( dentry_xp == XPTR_NULL )
2372	{
2373	return false;
2374	}
2375	else
2376	{
2377	*child_xp = (xptr_t)hal_remote_l64( XPTR( dentry_cxy , &dentry_ptr->child_xp ) );
2378	return true;
2379	}
2380
2381	} // end vfs_get_child()
2382
2383	//////////////////////////////////////////////////////////////////////////////////////////
2384	// This static function is used by the vfs_lookup() function.
2385	// It takes the <current> pointer on a buffer containing a complete pathname, and return
2386	// in the <name> buffer, allocated by the caller, a single name in the path.
2387	// It return also in the <next> pointer the next character to analyse in the path.
2388	// Finally it returns a <last> boolean, that is true when the returned <name> is the
2389	// last name in the path. The names are supposed to be separated by one or several '/'
2390	// characters, that are not written in the <name> buffer.
2391	//
2392	// WARNING: the leading characters '/' in the path are skiped before analysis.
2393	// The path "/" identifies the VFS root, and is therefore anaysed as an empty
2394	// string. This empty string is dignaled by the (-1) return value.
2395	//////////////////////////////////////////////////////////////////////////////////////////
2396	// @ current : pointer on first character to analyse in buffer containing the path.
2397	// @ name : [out] pointer on buffer allocated by the caller for the returned name.
2398	// @ next : [out] pointer on next character to analyse in buffer containing the path.
2399	// @ last : [out] true if the returned name is the last (NUL character found).
2400	// @ return 0 if success / return -1 if string empty (first chracter is NUL).
2401	//////////////////////////////////////////////////////////////////////////////////////////
2402	static error_t vfs_get_name_from_path( char * current,
2403	char * name,
2404	char ** next,
2405	bool_t * last )
2406	{
2407	char * ptr = current;
2408
2409	// skip leading '/' characters
2410	while( *ptr == '/' ) ptr++;
2411
2412	// signal empty string
2413	if( *ptr == 0 )
2414	{
2415	*last = true;
2416	return -1;
2417	}
2418
2419	// copy all characters in name until NUL or '/'
2420	while( (ptr != 0) && (ptr !='/') ) (name++) = (ptr++);
2421
2422	// set NUL terminating character in name buffer
2423	*(name++) = 0;
2424
2425	// return last an next
2426	if( *ptr == 0 ) // last found character is NUL => last name in path
2427	{
2428	*last = true;
2429	}
2430	else // last found character is '/' => skip it
2431	{
2432	*last = false;
2433	*next = ptr + 1;
2434	}
2435
2436	return 0;
2437
2438	} // end vfs_get name_from_path()
2439
2440	///////////////////////////////////////////////
2441	error_t vfs_lookup( xptr_t root_xp,
2442	char * pathname,
2443	uint32_t lookup_mode,
2444	xptr_t * inode_xp,
2445	char * last_name )
2446	{
2447	char name[CONFIG_VFS_MAX_NAME_LENGTH]; // one name in path
2448
2449	xptr_t parent_xp; // extended pointer on parent inode
2450	cxy_t parent_cxy; // cluster for parent inode
2451	vfs_inode_t * parent_ptr; // local pointer on parent inode
2452	xptr_t dentry_xp; // extended pointer on dentry
2453	xptr_t child_xp; // extended pointer on child inode
2454	cxy_t child_cxy; // cluster for child inode
2455	vfs_inode_t * child_ptr; // local pointer on child inode
2456	vfs_fs_type_t fs_type; // File system type
2457	vfs_ctx_t * ctx_ptr; // local pointer on FS context
2458	char * current; // current pointer on path
2459	char * next; // next value for current pointer
2460	bool_t last; // true when the name is the last in path
2461	bool_t found; // true when a child has been found
2462	bool_t create; // searched inode must be created if not found
2463	bool_t excl; // searched inode must not exist
2464	bool_t parent; // searched inode is the parent
2465	thread_t * this; // pointer on calling thread descriptor
2466	process_t * process; // pointer on calling process descriptor
2467	error_t error;
2468
2469	this = CURRENT_THREAD;
2470	process = this->process;
2471
2472	// check pathname / root_xp consistency
2473	assert( ((pathname[0] != '/') \|\| (root_xp == process->vfs_root_xp)),
2474	"root inode must be VFS root for path <%s>", pathname );
2475
2476	#if DEBUG_VFS_LOOKUP
2477	uint32_t cycle = (uint32_t)hal_get_cycles();
2478	char root_name[CONFIG_VFS_MAX_NAME_LENGTH];
2479	vfs_inode_get_name( root_xp , root_name );
2480	if( DEBUG_VFS_LOOKUP < cycle )
2481	printk("\n[%s] thread[%x,%x] enter / root <%s> / path <%s> / mode %x / cycle %d\n",
2482	__FUNCTION__, process->pid, this->trdid, root_name, pathname, lookup_mode, cycle );
2483	#endif
2484
2485	// compute lookup flags
2486	create = (lookup_mode & VFS_LOOKUP_CREATE) == VFS_LOOKUP_CREATE;
2487	excl = (lookup_mode & VFS_LOOKUP_EXCL) == VFS_LOOKUP_EXCL;
2488	parent = (lookup_mode & VFS_LOOKUP_PARENT) == VFS_LOOKUP_PARENT;
2489
2490	// initialise loop variables
2491	parent_xp = root_xp;
2492	current = pathname;
2493	next = NULL;
2494	last = false;
2495	child_xp = XPTR_NULL;
2496
2497	// loop on nodes in pathname
2498	// load from device if one node in path not found in Inode Tree
2499	// exit loop when last name found (i.e. last == true)
2500	while( 1 )
2501	{
2502	// get parent inode cluster and local pointer
2503	parent_cxy = GET_CXY( parent_xp );
2504	parent_ptr = GET_PTR( parent_xp );
2505
2506	// get one "name" from path, and "last" flag
2507	error = vfs_get_name_from_path( current , name , &next , &last );
2508
2509	// handle VFS root case
2510	if ( error )
2511	{
2512
2513	#if DEBUG_VFS_LOOKUP
2514	cycle = (uint32_t)hal_get_cycles();
2515	if( DEBUG_VFS_LOOKUP < cycle )
2516	printk("\n[%s] thread[%x,%x] exit / parent inode(%x,%x) / <%s> / cycle %d\n",
2517	__FUNCTION__ , process->pid, this->trdid, parent_cxy, parent_ptr, pathname, cycle );
2518	#endif
2519	*inode_xp = process->vfs_root_xp;
2520	break;
2521	}
2522
2523	#if (DEBUG_VFS_LOOKUP & 1)
2524	if( DEBUG_VFS_LOOKUP < cycle )
2525	printk("\n[%s] thread[%x,%x] search <%s> in <%s> / last = %d\n",
2526	__FUNCTION__, process->pid, this->trdid, name, pathname, last );
2527	#endif
2528
2529	// search the child dentry matching name in parent inode
2530	found = vfs_get_child( parent_xp,
2531	name,
2532	&child_xp );
2533
2534	// get child inode local pointer and cluster
2535	child_ptr = GET_PTR( child_xp );
2536	child_cxy = GET_CXY( child_xp );
2537
2538	if( found == false ) // not found in Inode Tree
2539	{
2540	// when a inode is not found in the Inode Tree:
2541	// - if (last and parent) the Inode Tree is not modified
2542	// - else we speculatively introduce a new (dentry/inode) in inode tree,
2543	// and scan the parent directory mapper to initialise it.
2544	// . if it is not found in the parent mapper:
2545	// - if(last and create), a brand new file or directory is created
2546	// - else, an error is reported
2547	// . if it is found in parent mapper:
2548	// - if( last and excl ), an error is reported
2549	// - else the new child (inode & dentry) is initialised in Inode Tree
2550	// - if the child is a directory, the child mapper is loaded from device
2551
2552	if( last && parent ) // does nothing
2553	{
2554
2555	#if (DEBUG_VFS_LOOKUP & 1)
2556	if( DEBUG_VFS_LOOKUP < cycle )
2557	printk("\n[%s] thread[%x,%x] child not found but only parent requested in <%s>\n",
2558	__FUNCTION__, process->pid, this->trdid, pathname );
2559	#endif
2560	}
2561	else // try to get it from parent mapper
2562	{
2563
2564	#if (DEBUG_VFS_LOOKUP & 1)
2565	if( DEBUG_VFS_LOOKUP < cycle )
2566	printk("\n[%s] thread[%x,%x] miss <%s> inode in Inode Tree => build from parent mapper\n",
2567	__FUNCTION__, process->pid, this->trdid, name );
2568	#endif
2569	// get parent inode FS type
2570	ctx_ptr = hal_remote_lpt( XPTR( parent_cxy,&parent_ptr->ctx ) );
2571	fs_type = hal_remote_l32( XPTR( parent_cxy , &ctx_ptr->type ) );
2572
2573	// select a cluster for new inode
2574	child_cxy = cluster_random_select();
2575
2576	// insert a new child dentry/inode couple in inode tree
2577	error = vfs_add_child_in_parent( child_cxy,
2578	fs_type,
2579	parent_xp,
2580	name,
2581	&dentry_xp,
2582	&child_xp );
2583	if( error )
2584	{
2585	printk("\n[ERROR] in %s : cannot create inode <%s> in path <%s>\n",
2586	__FUNCTION__ , name, pathname );
2587	return -1;
2588	}
2589
2590	// get child inode local pointer
2591	child_ptr = GET_PTR( child_xp );
2592
2593	#if (DEBUG_VFS_LOOKUP & 1)
2594	if( DEBUG_VFS_LOOKUP < cycle )
2595	printk("\n[%s] thread[%x,%x] created missing inode for <%s> in cluster %x\n",
2596	__FUNCTION__, process->pid, this->trdid, name, child_cxy );
2597	#endif
2598	// scan parent mapper to find the missing dentry, and complete
2599	// the initialisation of dentry and child inode descriptors
2600	if( parent_cxy == local_cxy )
2601	{
2602	error = vfs_fs_new_dentry( parent_ptr,
2603	name,
2604	child_xp );
2605	}
2606	else
2607	{
2608	rpc_vfs_fs_new_dentry_client( parent_cxy,
2609	parent_ptr,
2610	name,
2611	child_xp,
2612	&error );
2613	}
2614
2615	// when the missing dentry is not in the parent mapper,
2616	// a new dentry must be registered in parent directory mapper
2617	if ( error )
2618	{
2619	if ( last && create ) // add a brand new dentry in parent directory
2620	{
2621	error = vfs_new_dentry_init( parent_xp,
2622	dentry_xp,
2623	child_xp );
2624	if ( error )
2625	{
2626	printk("\n[ERROR] in %s : cannot init inode <%s> in path <%s>\n",
2627	__FUNCTION__, name, pathname );
2628	vfs_remove_child_from_parent( dentry_xp );
2629	return -1;
2630	}
2631
2632	#if (DEBUG_VFS_LOOKUP & 1)
2633	if( DEBUG_VFS_LOOKUP < cycle )
2634	printk("\n[%s] thread[%x,%x] child <%s> not found in parent mapper => created it\n",
2635	__FUNCTION__, process->pid, this->trdid, name );
2636	vfs_inode_display( child_xp );
2637	#endif
2638
2639
2640	}
2641	else // not last or not create => error
2642	{
2643	printk("\n[ERROR] in %s : <%s> node not found in parent for <%s>\n",
2644	__FUNCTION__ , name , pathname );
2645	vfs_remove_child_from_parent( dentry_xp );
2646	return -1;
2647	}
2648	}
2649	else // child has been found in parent mapper
2650	{
2651	// check the excl
2652	if( last && create && excl )
2653	{
2654	printk("\n[ERROR] in %s : node already exist <%s>\n",
2655	__FUNCTION__, name );
2656	return -1;
2657	}
2658
2659	#if (DEBUG_VFS_LOOKUP & 1)
2660	if( DEBUG_VFS_LOOKUP < cycle )
2661	printk("\n[%s] thread[%x,%x] initialised inode <%s> from parent mapper\n",
2662	__FUNCTION__, process->pid, this->trdid, name );
2663	#endif
2664	// load child mapper from device if child is a directory (prefetch)
2665	uint32_t type = hal_remote_l32( XPTR( child_cxy , &child_ptr->type ) );
2666	if( type == INODE_TYPE_DIR )
2667	{
2668	if( child_cxy == local_cxy )
2669	{
2670	error = vfs_inode_load_all_pages( child_ptr );
2671	}
2672	else
2673	{
2674	rpc_vfs_inode_load_all_pages_client( child_cxy,
2675	child_ptr,
2676	&error );
2677	}
2678	if ( error )
2679	{
2680	printk("\n[ERROR] in %s : cannot load <%s> from device\n",
2681	__FUNCTION__ , name );
2682	vfs_remove_child_from_parent( dentry_xp );
2683	return -1;
2684	}
2685
2686	#if (DEBUG_VFS_LOOKUP & 1)
2687	if( DEBUG_VFS_LOOKUP < cycle )
2688	printk("\n[%s] thread[%x,%x] loaded directory mapper for <%s> from IOC\n",
2689	__FUNCTION__ , process->pid, this->trdid, name );
2690	#endif
2691	}
2692	}
2693	}
2694	}
2695	else // child directly found in inode tree
2696	{
2697
2698	#if (DEBUG_VFS_LOOKUP & 1)
2699	if( DEBUG_VFS_LOOKUP < cycle )
2700	printk("\n[%s] thread[%x,%x] found <%s> in Inode Tree / inode (%x,%x)\n",
2701	__FUNCTION__, process->pid, this->trdid, name, child_cxy, child_ptr );
2702	#endif
2703	// check the excl flag
2704	if( last && create && excl )
2705	{
2706	printk("\n[ERROR] in %s : node <%s> already exist\n",
2707	__FUNCTION__, name );
2708	return -1;
2709	}
2710	}
2711
2712	// TODO check access rights here [AG]
2713	// error = vfs_access_denied( child_xp,
2714	// client_uid,
2715	// client_gid );
2716	// if( error )
2717	// {
2718	// printk("\n[ERROR] in %s : thread %x / permission denied for %s\n",
2719	// __FUNCTION__ , this , name );
2720	// return EACCES;
2721	// }
2722
2723	// take lock on child inode and release lock on parent
2724	// vfs_inode_lock( child_xp );
2725	// vfs_inode_unlock( parent_xp );
2726
2727	// exit when last
2728	if ( last ) // last inode in path => return relevant info
2729	{
2730	if ( parent ) // return parent inode and child name
2731	{
2732
2733	#if DEBUG_VFS_LOOKUP
2734	cycle = (uint32_t)hal_get_cycles();
2735	if( DEBUG_VFS_LOOKUP < cycle )
2736	printk("\n[%s] thread[%x,%x] exit / parent inode(%x,%x) / <%s> / cycle %d\n",
2737	__FUNCTION__ , process->pid, this->trdid, parent_cxy, parent_ptr, pathname, cycle );
2738	#endif
2739	*inode_xp = parent_xp;
2740	strcpy( last_name , name );
2741	break;
2742	}
2743	else // return child inode name
2744	{
2745
2746	#if DEBUG_VFS_LOOKUP
2747	cycle = (uint32_t)hal_get_cycles();
2748	if( DEBUG_VFS_LOOKUP < cycle )
2749	printk("\n[%s] thread[%x,%x] exit / child inode (%x,%x) / <%s> / cycle %d\n",
2750	__FUNCTION__ , process->pid, this->trdid, child_cxy, child_ptr, pathname, cycle );
2751	#endif
2752	*inode_xp = child_xp;
2753	break;
2754	}
2755	}
2756	else // not the last inode in path => update loop variables
2757	{
2758	parent_xp = child_xp;
2759	current = next;
2760	}
2761	}
2762
2763	return 0;
2764
2765	} // end vfs_lookup()
2766
2767	////////////////////////////////////////////////
2768	error_t vfs_new_dentry_init( xptr_t parent_xp,
2769	xptr_t dentry_xp,
2770	xptr_t child_xp )
2771	{
2772	error_t error;
2773	uint32_t cluster;
2774	uint32_t child_type;
2775	uint32_t child_size;
2776
2777	#if DEBUG_VFS_NEW_DENTRY_INIT
2778	char parent_name[CONFIG_VFS_MAX_NAME_LENGTH];
2779	char child_name[CONFIG_VFS_MAX_NAME_LENGTH];
2780	vfs_inode_get_name( parent_xp , parent_name );
2781	vfs_inode_get_name( child_xp , child_name );
2782	uint32_t cycle = (uint32_t)hal_get_cycles();
2783	thread_t * this = CURRENT_THREAD;
2784	if( DEBUG_VFS_NEW_DENTRY_INIT < cycle )
2785	printk("\n[%s] thread[%x,%x] enter / parent <%s> / child <%s> / cycle %d\n",
2786	__FUNCTION__ , this->process->pid, this->trdid, parent_name, child_name, cycle );
2787	#endif
2788
2789	// get parent inode cluster and local pointer
2790	cxy_t parent_cxy = GET_CXY( parent_xp );
2791	vfs_inode_t * parent_ptr = GET_PTR( parent_xp );
2792
2793	// get dentry local pointer
2794	vfs_dentry_t * dentry_ptr = GET_PTR( dentry_xp );
2795
2796	// get child inode cluster and local pointer
2797	cxy_t child_cxy = GET_CXY( child_xp );
2798	vfs_inode_t * child_ptr = GET_PTR( child_xp );
2799
2800	// 1. allocate one free cluster in file system to child inode,
2801	// and update the File Allocation Table in both the FAT mapper and IOC device.
2802	// It depends on the child inode FS type.
2803	vfs_ctx_t * ctx = hal_remote_lpt( XPTR( child_cxy , &child_ptr->ctx ) );
2804
2805	error = vfs_fs_cluster_alloc( ctx->type,
2806	&cluster );
2807	if ( error )
2808	{
2809	printk("\n[ERROR] in %s : cannot find a free VFS cluster\n",
2810	__FUNCTION__ );
2811	return -1;
2812	}
2813
2814	#if( DEBUG_VFS_NEW_DENTRY_INIT & 1)
2815	if( DEBUG_VFS_NEW_DENTRY_INIT < cycle )
2816	printk("\n[%s] thread[%x,%x] allocated FS cluster %x to <%s>\n",
2817	__FUNCTION__ , this->process->pid, this->trdid, cluster, child_name );
2818	#endif
2819
2820	// 2. update the child inode descriptor size and extend
2821	child_type = hal_remote_l32( XPTR( child_cxy , &child_ptr->type ) );
2822	child_size = (child_type == INODE_TYPE_DIR) ? 4096 : 0;
2823
2824	hal_remote_s32( XPTR( child_cxy , &child_ptr->size ) , child_size );
2825	hal_remote_spt( XPTR( child_cxy , &child_ptr->extend ) , (void*)(intptr_t)cluster );
2826
2827	// 3. update the parent inode mapper, and
2828	// update the dentry extension if required
2829	if( local_cxy == parent_cxy )
2830	{
2831	error = vfs_fs_add_dentry( parent_ptr,
2832	dentry_ptr );
2833	}
2834	else
2835	{
2836	rpc_vfs_fs_add_dentry_client( parent_cxy,
2837	parent_ptr,
2838	dentry_ptr,
2839	&error );
2840	}
2841	if ( error )
2842	{
2843	printk("\n[ERROR] in %s : cannot register child in parent directory\n",
2844	__FUNCTION__ );
2845	return -1;
2846	}
2847
2848	#if DEBUG_VFS_NEW_DENTRY_INIT
2849	cycle = (uint32_t)hal_get_cycles();
2850	if( DEBUG_VFS_NEW_DENTRY_INIT < cycle )
2851	printk("\n[%s] thread[%x,%x] exit / parent <%s> / child <%s> / cycle %d\n",
2852	__FUNCTION__ , this->process->pid, this->trdid, parent_name, child_name, cycle );
2853	#endif
2854
2855	return 0;
2856
2857	} // end vfs_new_dentry_init()
2858
2859	///////////////////////////////////////////////////
2860	error_t vfs_add_special_dentries( xptr_t child_xp,
2861	xptr_t parent_xp )
2862	{
2863	error_t error;
2864	vfs_inode_t * child_ptr; // local pointer on child inode directory
2865	cxy_t child_cxy; // child inode directory cluster identifier
2866	vfs_ctx_t * ctx_ptr; // local pointer on child inode FS context
2867	vfs_fs_type_t fs_type; // FS type of child inode
2868	xptr_t dentry_xp; // extended pointer on dentry (used for . and ..)
2869	vfs_dentry_t * dentry_ptr; // local pointer on dentry (used for . and ..)
2870
2871	// xptr_t parents_root_xp; // extended pointer on inode "parents" field
2872	// xptr_t parents_entry_xp; // extended pointer on dentry "parents" field
2873	xptr_t children_xhtab_xp; // extended pointer on inode "children" field
2874	xptr_t children_entry_xp; // extended pointer on dentry "children" field
2875
2876	#if DEBUG_VFS_ADD_SPECIAL
2877	uint32_t cycle = (uint32_t)hal_get_cycles();
2878	thread_t * this = CURRENT_THREAD;
2879	char child_name[CONFIG_VFS_MAX_NAME_LENGTH];
2880	char parent_name[CONFIG_VFS_MAX_NAME_LENGTH];
2881	vfs_inode_get_name( child_xp , child_name );
2882	vfs_inode_get_name( parent_xp , parent_name );
2883	if( DEBUG_VFS_ADD_SPECIAL < cycle )
2884	printk("\n[%s] thread[%x,%x] enter for child <%s> in parent <%s> / cycle %d\n",
2885	__FUNCTION__, this->process->pid, this->trdid, child_name, parent_name, cycle );
2886	#endif
2887
2888	// get new directory cluster and local pointer
2889	child_cxy = GET_CXY( child_xp );
2890	child_ptr = GET_PTR( child_xp );
2891
2892	// get child inode FS type
2893	ctx_ptr = hal_remote_lpt( XPTR( child_cxy , &child_ptr->ctx ) );
2894	fs_type = hal_remote_l32( XPTR( child_cxy , &ctx_ptr->type ) );
2895
2896	//////////////////////////// create <.> dentry //////////////////////
2897	if( child_cxy == local_cxy )
2898	{
2899	error = vfs_dentry_create( fs_type,
2900	".",
2901	&dentry_xp );
2902	}
2903	else
2904	{
2905	rpc_vfs_dentry_create_client( child_cxy,
2906	fs_type,
2907	".",
2908	&dentry_xp,
2909	&error );
2910	}
2911	if( error )
2912	{
2913	printk("\n[ERROR] in %s : cannot create dentry <.> in cluster %x\n",
2914	__FUNCTION__ , child_cxy );
2915	return -1;
2916	}
2917
2918	// get <.> dentry local pointer
2919	dentry_ptr = GET_PTR( dentry_xp );
2920
2921	#if(DEBUG_VFS_ADD_SPECIAL & 1)
2922	cycle = (uint32_t)hal_get_cycles();
2923	if( DEBUG_VFS_ADD_SPECIAL < cycle )
2924	printk("\n[%s] thread[%x,%x] created dentry <.> (%x,%x) / cycle %d\n",
2925	__FUNCTION__, this->process->pid, this->trdid, child_cxy, dentry_ptr, cycle );
2926	#endif
2927
2928	// register <.> dentry in child inode xhtab of children
2929	children_xhtab_xp = XPTR( child_cxy , &child_ptr->children );
2930	children_entry_xp = XPTR( child_cxy , &dentry_ptr->children );
2931	error = xhtab_insert( children_xhtab_xp , "." , children_entry_xp );
2932	if( error )
2933	{
2934	printk("\n[ERROR] in %s : cannot register dentry <.> in xhtab\n",
2935	__FUNCTION__ );
2936	return -1;
2937	}
2938
2939
2940	// don't register <.> dentry in child_inode xlist of parents
2941	// parents_root_xp = XPTR( child_cxy , &child_ptr->parents );
2942	// parents_entry_xp = XPTR( child_cxy , &dentry_ptr->parents );
2943	// xlist_add_first( parents_root_xp , parents_entry_xp );
2944	// hal_remote_atomic_add( XPTR( child_cxy , &child_ptr->links ) , 1 );
2945
2946	// update "parent" and "child_xp" fields in <.> dentry
2947	hal_remote_s64( XPTR( child_cxy , &dentry_ptr->child_xp ) , child_xp );
2948	hal_remote_spt( XPTR( child_cxy , &dentry_ptr->parent ) , child_ptr );
2949
2950	#if(DEBUG_VFS_ADD_SPECIAL & 1)
2951	cycle = (uint32_t)hal_get_cycles();
2952	if( DEBUG_VFS_ADD_SPECIAL < cycle )
2953	printk("\n[%s] thread[%x,%x] linked dentry <.> to parent and child inodes / cycle %d\n",
2954	__FUNCTION__, this->process->pid, this->trdid, cycle );
2955	#endif
2956
2957	// introduce <.> dentry into child directory mapper
2958	// only if the target directory is not the root VFS
2959	if( child_xp != parent_xp )
2960	{
2961	if( child_cxy == local_cxy )
2962	{
2963	error = vfs_fs_add_dentry( child_ptr,
2964	dentry_ptr );
2965	}
2966	else
2967	{
2968	rpc_vfs_fs_add_dentry_client( child_cxy,
2969	child_ptr,
2970	dentry_ptr,
2971	&error );
2972	}
2973	if( error )
2974	{
2975	printk("\n[ERROR] in %s : cannot introduce dentry <..> in mapper %x\n",
2976	__FUNCTION__ );
2977	return -1;
2978	}
2979
2980	#if(DEBUG_VFS_ADD_SPECIAL & 1)
2981	cycle = (uint32_t)hal_get_cycles();
2982	if( DEBUG_VFS_ADD_SPECIAL < cycle )
2983	printk("\n[%s] thread[%x,%x] registered dentry <.> in child mapper / cycle %d\n",
2984	__FUNCTION__, this->process->pid, this->trdid, cycle );
2985	#endif
2986
2987	}
2988
2989	///////////////////////////// create <..> dentry ///////////////////////
2990	if( child_cxy == local_cxy )
2991	{
2992	error = vfs_dentry_create( fs_type,
2993	"..",
2994	&dentry_xp );
2995	}
2996	else
2997	{
2998	rpc_vfs_dentry_create_client( child_cxy,
2999	fs_type,
3000	"..",
3001	&dentry_xp,
3002	&error );
3003	}
3004	if( error )
3005	{
3006	printk("\n[ERROR] in %s : cannot create dentry <..> in cluster %x\n",
3007	__FUNCTION__ , child_cxy );
3008	return -1;
3009	}
3010
3011	// get <..> dentry local pointer
3012	dentry_ptr = GET_PTR( dentry_xp );
3013
3014	#if(DEBUG_VFS_ADD_SPECIAL & 1)
3015	cycle = (uint32_t)hal_get_cycles();
3016	if( DEBUG_VFS_ADD_SPECIAL < cycle )
3017	printk("\n[%s] thread[%x,%x] created dentry <..> (%x,%x) / cycle %d\n",
3018	__FUNCTION__, this->process->pid, this->trdid, child_cxy, dentry_ptr, cycle );
3019	#endif
3020
3021	// register <..> dentry in child_inode xhtab of children
3022	children_xhtab_xp = XPTR( child_cxy , &child_ptr->children );
3023	children_entry_xp = XPTR( child_cxy , &dentry_ptr->children );
3024	error = xhtab_insert( children_xhtab_xp , ".." , children_entry_xp );
3025	if( error )
3026	{
3027	printk("\n[ERROR] in %s : cannot register dentry <..> in xhtab\n",
3028	__FUNCTION__ );
3029	return -1;
3030	}
3031
3032	// don't register <..> dentry in parent_inode xlist of parents
3033
3034	// update "parent" and "child_xp" fields in <..> dentry
3035	hal_remote_s64( XPTR( child_cxy , &dentry_ptr->child_xp ) , parent_xp );
3036	hal_remote_spt( XPTR( child_cxy , &dentry_ptr->parent ) , child_ptr );
3037
3038	#if(DEBUG_VFS_ADD_SPECIAL & 1)
3039	cycle = (uint32_t)hal_get_cycles();
3040	if( DEBUG_VFS_ADD_SPECIAL < cycle )
3041	printk("\n[%s] thread[%x,%x] linked dentry <..> to parent and child inodes / cycle %d\n",
3042	__FUNCTION__, this->process->pid, this->trdid, cycle );
3043	#endif
3044
3045	// introduce <..> dentry into child directory mapper
3046	// only if the target directory is not the root VFS
3047	if( child_xp != parent_xp )
3048	{
3049	if( child_cxy == local_cxy )
3050	{
3051	error = vfs_fs_add_dentry( child_ptr,
3052	dentry_ptr );
3053	}
3054	else
3055	{
3056	rpc_vfs_fs_add_dentry_client( child_cxy,
3057	child_ptr,
3058	dentry_ptr,
3059	&error );
3060	}
3061	if( error )
3062	{
3063	printk("\n[ERROR] in %s : cannot introduce dentry <..> in mapper %x\n",
3064	__FUNCTION__ );
3065	return -1;
3066	}
3067
3068	#if(DEBUG_VFS_ADD_SPECIAL & 1)
3069	cycle = (uint32_t)hal_get_cycles();
3070	if( DEBUG_VFS_ADD_SPECIAL < cycle )
3071	printk("\n[%s] thread[%x,%x] registered dentry <..> in child mapper / cycle %d\n",
3072	__FUNCTION__, this->process->pid, this->trdid, cycle );
3073	#endif
3074
3075	}
3076
3077	#if DEBUG_VFS_ADD_SPECIAL
3078	cycle = (uint32_t)hal_get_cycles();
3079	if( DEBUG_VFS_ADD_SPECIAL < cycle )
3080	printk("\n[%s] thread[%x,%x] exit for child <%s> in parent <%s> / cycle %d\n",
3081	__FUNCTION__, this->process->pid, this->trdid, child_name, parent_name, cycle );
3082	#endif
3083
3084	return 0;
3085
3086	} // end vfs_add_special_dentries()
3087
3088	//////////////////////////////////////////
3089	error_t vfs_get_path( xptr_t inode_xp,
3090	char * buffer,
3091	char ** first,
3092	uint32_t max_size )
3093	{
3094	xptr_t dentry_xp; // extended pointer on current dentry
3095	vfs_dentry_t * dentry_ptr; // local pointer on current dentry
3096	cxy_t dentry_cxy; // current dentry cluster identifier
3097	xptr_t name_xp; // extended pointer on current dentry name
3098	uint32_t length; // length of current dentry name
3099	int32_t index; // slot index in buffer
3100	xptr_t current_xp; // extended pointer on current inode
3101	vfs_inode_t * current_ptr; // local pointer on current inode
3102	cxy_t current_cxy; // current inode cluster identifier
3103	xptr_t vfs_root_xp; // extended pointer on VFS root inode
3104	vfs_inode_t * vfs_root_ptr; // local pointer on VFS root inode
3105	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
3106	xptr_t lock_xp; // extended pointer on Inode Tree lock
3107	xptr_t parents_root_xp; // extended pointer on current inode parents root
3108	bool_t found; // condition to exit the while loop
3109
3110	thread_t * this = CURRENT_THREAD;
3111	process_t * process = this->process;
3112
3113	#if DEBUG_VFS_GET_PATH
3114	uint32_t cycle = (uint32_t)hal_get_cycles();
3115	if( DEBUG_VFS_GET_PATH < cycle )
3116	printk("\n[%s] thread[%x,%x] enter : inode (%x,%x) / cycle %d\n",
3117	__FUNCTION__ , process->pid, this->trdid,
3118	GET_CXY( inode_xp ), GET_PTR( inode_xp ), cycle );
3119	#endif
3120
3121	// set the NUL character in buffer / initialise buffer index
3122	buffer[max_size - 1] = 0;
3123	index = (int32_t)(max_size - 1);
3124
3125	// initialize current inode
3126	current_xp = inode_xp;
3127
3128	// build extended pointer on lock protecting Inode Tree
3129	vfs_root_xp = process->vfs_root_xp;
3130	vfs_root_ptr = GET_PTR( vfs_root_xp );
3131	vfs_root_cxy = GET_CXY( vfs_root_xp );
3132	lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
3133
3134	// take lock protecting Inode Tree in read mode
3135	remote_rwlock_rd_acquire( lock_xp );
3136
3137	// traverse Inode Tree from target inode to VFS root
3138	// selecting always the first parent dentry
3139	// the buffer is written in "reverse order" (from target inode to root)
3140	// exit the while loop when the VFS root has been found
3141	do
3142	{
3143	// get current inode cluster and local pointer
3144	current_cxy = GET_CXY( current_xp );
3145	current_ptr = GET_PTR( current_xp );
3146
3147	// build extended pointer on parents dentries root
3148	parents_root_xp = XPTR( current_cxy , &current_ptr->parents );
3149
3150	// compute exit condition <=> current inode is VFS root
3151	found = xlist_is_empty( parents_root_xp );
3152
3153	if( found ) // parent is the VFS root
3154	{
3155	if( index == (int32_t)(max_size - 1) )
3156	{
3157	// update index
3158	index--;
3159
3160	// set separator
3161	buffer[index] = '/';
3162
3163	// check buffer overflow
3164	assert( (index >= 0) , "kernel buffer too small" );
3165
3166	}
3167	}
3168	else // not the VFS root
3169	{
3170	// get first parent dentry cluster and pointers
3171	dentry_xp = XLIST_FIRST( parents_root_xp , vfs_dentry_t , parents );
3172	dentry_cxy = GET_CXY( dentry_xp );
3173	dentry_ptr = GET_PTR( dentry_xp );
3174
3175	// get extended pointer on dentry name and name length
3176	name_xp = XPTR( dentry_cxy , dentry_ptr->name );
3177	length = hal_remote_l32( XPTR( dentry_cxy , &dentry_ptr->length ) );
3178
3179	#if (DEBUG_VFS_GET_PATH & 1)
3180	char debug_name[CONFIG_VFS_MAX_NAME_LENGTH];
3181	hal_remote_strcpy( XPTR( local_cxy , debug_name ) , name_xp );
3182	if( DEBUG_VFS_GET_PATH < cycle )
3183	printk("\n[%s] thread(%x,%s) get current dentry <%s> in cluster %x\n",
3184	__FUNCTION__ , process->pid, this->trdid, debug_name, current_cxy );
3185	#endif
3186	// update index
3187	index -= (length + 1);
3188
3189	// check buffer overflow
3190	assert( (index >= 0) , "kernel buffer too small" );
3191
3192	// update pathname
3193	hal_remote_memcpy( XPTR( local_cxy , &buffer[index + 1] ) ,
3194	name_xp , length );
3195
3196	// set separator
3197	buffer[index] = '/';
3198
3199	// get extended pointer on parent inode
3200	current_xp = XPTR( dentry_cxy ,
3201	hal_remote_lpt( XPTR( dentry_cxy , &dentry_ptr->parent ) ) );
3202	}
3203	}
3204	while( found == false );
3205
3206	// release lock protecting Inode Tree in read mode
3207	remote_rwlock_rd_release( lock_xp );
3208
3209	#if DEBUG_VFS_GET_PATH
3210	cycle = (uint32_t)hal_get_cycles();
3211	if( DEBUG_VFS_GET_PATH < cycle )
3212	printk("\n[%s] thread[%x,%x] exit : path <%s> / cycle %d\n",
3213	__FUNCTION__ , process->pid, this->trdid, &buffer[index], cycle );
3214	#endif
3215
3216	// return pointer on first character in buffer
3217	*first = &buffer[index];
3218	return 0;
3219
3220	} // end vfs_get_path()
3221
3222
3223	////////////////////////////////////////////////////////////////////
3224	error_t vfs_add_child_in_parent( cxy_t child_cxy,
3225	vfs_fs_type_t fs_type,
3226	xptr_t parent_inode_xp,
3227	char * name,
3228	xptr_t * child_dentry_xp,
3229	xptr_t * child_inode_xp )
3230	{
3231	error_t error;
3232	cxy_t parent_cxy; // parent inode cluster identifier
3233	vfs_inode_t * parent_inode_ptr; // parent inode local pointer
3234	xptr_t new_dentry_xp; // extended pointer on created dentry
3235	vfs_dentry_t * new_dentry_ptr; // created dentry local pointer
3236	xptr_t new_inode_xp; // extended pointer on created child inode
3237	vfs_inode_t * new_inode_ptr; // local pointer on created child inode
3238
3239	xptr_t parents_root_xp; // extended pointer on child inode "parents" field
3240	xptr_t parents_entry_xp; // extended pointer on child dentry "parents" field
3241	xptr_t children_xhtab_xp; // extended pointer on parent inode "children" field
3242	xptr_t children_entry_xp; // extended pointer on child dentry "children" field
3243
3244	// get parent inode cluster and pointer
3245	parent_cxy = GET_CXY( parent_inode_xp );
3246	parent_inode_ptr = GET_PTR( parent_inode_xp );
3247
3248	#if DEBUG_VFS_ADD_CHILD
3249	char parent_name[CONFIG_VFS_MAX_NAME_LENGTH];
3250	vfs_inode_get_name( parent_inode_xp , parent_name );
3251	uint32_t cycle = (uint32_t)hal_get_cycles();
3252	thread_t * this = CURRENT_THREAD;
3253	if( DEBUG_VFS_ADD_CHILD < cycle )
3254	printk("\n[%s] thread[%x,%x] enter / child <%s> / parent <%s> / cycle %d\n",
3255	__FUNCTION__, this->process->pid, this->trdid, name,
3256	parent_name, (uint32_t)hal_get_cycles() );
3257	#endif
3258
3259	// 1. create dentry in parent cluster
3260	if( parent_cxy == local_cxy ) // parent cluster is local
3261	{
3262	error = vfs_dentry_create( fs_type,
3263	name,
3264	&new_dentry_xp );
3265	}
3266	else // parent cluster is remote
3267	{
3268	rpc_vfs_dentry_create_client( parent_cxy,
3269	fs_type,
3270	name,
3271	&new_dentry_xp,
3272	&error );
3273	}
3274
3275	if( error )
3276	{
3277	printk("\n[ERROR] in %s : cannot create dentry <%s> in cluster %x\n",
3278	__FUNCTION__ , name , parent_cxy );
3279	return -1;
3280	}
3281
3282	// get dentry local pointer
3283	new_dentry_ptr = GET_PTR( new_dentry_xp );
3284
3285	#if(DEBUG_VFS_ADD_CHILD & 1)
3286	if( DEBUG_VFS_ADD_CHILD < cycle )
3287	printk("\n[%s] thread[%x,%x] / dentry <%s> created (%x,%x)\n",
3288	__FUNCTION__, this->process->pid, this->trdid, name, parent_cxy, new_dentry_ptr );
3289	#endif
3290
3291	// 2. create child inode in child cluster
3292	// TODO : define attr / mode / uid / gid
3293	uint32_t attr = 0;
3294	uint32_t mode = 0;
3295	uint32_t uid = 0;
3296	uint32_t gid = 0;
3297
3298	if( child_cxy == local_cxy ) // child cluster is local
3299	{
3300	error = vfs_inode_create( fs_type,
3301	attr,
3302	mode,
3303	uid,
3304	gid,
3305	&new_inode_xp );
3306	}
3307	else // child cluster is remote
3308	{
3309	rpc_vfs_inode_create_client( child_cxy,
3310	fs_type,
3311	attr,
3312	mode,
3313	uid,
3314	gid,
3315	&new_inode_xp,
3316	&error );
3317	}
3318
3319	if( error )
3320	{
3321	printk("\n[ERROR] in %s : cannot create inode in cluster %x\n",
3322	__FUNCTION__ , child_cxy );
3323
3324	if( parent_cxy == local_cxy ) vfs_dentry_destroy( new_dentry_ptr );
3325	else rpc_vfs_dentry_destroy_client( parent_cxy , new_dentry_ptr );
3326	return -1;
3327	}
3328
3329	// get new inode local pointer
3330	new_inode_ptr = GET_PTR( new_inode_xp );
3331
3332	#if(DEBUG_VFS_ADD_CHILD & 1)
3333	if( DEBUG_VFS_ADD_CHILD < cycle )
3334	printk("\n[%s] thread[%x,%x] / inode <%s> created (%x,%x)\n",
3335	__FUNCTION__ , this->process->pid, this->trdid, name , child_cxy, new_inode_ptr );
3336	#endif
3337
3338
3339	// 3. register new_dentry in new_inode xlist of parents
3340	parents_root_xp = XPTR( child_cxy , &new_inode_ptr->parents );
3341	parents_entry_xp = XPTR( parent_cxy, &new_dentry_ptr->parents );
3342	xlist_add_first( parents_root_xp , parents_entry_xp );
3343	hal_remote_atomic_add( XPTR( child_cxy , &new_inode_ptr->links ) , 1 );
3344
3345	#if(DEBUG_VFS_ADD_CHILD & 1)
3346	if( DEBUG_VFS_ADD_CHILD < cycle )
3347	printk("\n[%s] thread[%x,%x] link dentry(%x,%x) to child inode(%x,%x)\n",
3348	__FUNCTION__, this->process->pid, this->trdid,
3349	parent_cxy, new_dentry_ptr, child_cxy, new_inode_ptr );
3350	#endif
3351
3352	// 4. register new_dentry in parent_inode xhtab of children
3353	children_xhtab_xp = XPTR( parent_cxy , &parent_inode_ptr->children );
3354	children_entry_xp = XPTR( parent_cxy , &new_dentry_ptr->children );
3355	xhtab_insert( children_xhtab_xp , name , children_entry_xp );
3356
3357	#if(DEBUG_VFS_ADD_CHILD & 1)
3358	if( DEBUG_VFS_ADD_CHILD < cycle )
3359	printk("\n[%s] thread[%x,%x] link dentry(%x,%x) to parent inode(%x,%x)\n",
3360	__FUNCTION__, this->process->pid, this->trdid,
3361	parent_cxy, new_dentry_ptr, parent_cxy, parent_inode_ptr );
3362	#endif
3363
3364	// 5. update "parent" and "child_xp" fields in new_dentry
3365	hal_remote_s64( XPTR( parent_cxy , &new_dentry_ptr->child_xp ) , new_inode_xp );
3366	hal_remote_spt( XPTR( parent_cxy , &new_dentry_ptr->parent ) , parent_inode_ptr );
3367
3368	#if DEBUG_VFS_ADD_CHILD
3369	cycle = (uint32_t)hal_get_cycles();
3370	if( DEBUG_VFS_ADD_CHILD < cycle )
3371	printk("\n[%s] thread[%x,%x] exit for <%s> / cycle %d\n",
3372	__FUNCTION__, this->process->pid, this->trdid, name, cycle );
3373	#endif
3374
3375	// return extended pointer on dentry & child inode
3376	*child_dentry_xp = new_dentry_xp;
3377	*child_inode_xp = new_inode_xp;
3378	return 0;
3379
3380	} // end vfs_add_child_in_parent()
3381
3382	/////////////////////////////////////////////////////
3383	void vfs_remove_child_from_parent( xptr_t dentry_xp )
3384	{
3385	cxy_t parent_cxy; // parent inode cluster identifier
3386	cxy_t child_cxy; // child inode cluster identifier
3387	vfs_dentry_t * dentry_ptr; // local pointer on dentry
3388	xptr_t child_inode_xp; // extended pointer on child inode
3389	vfs_inode_t * child_inode_ptr; // local pointer on child inode
3390	vfs_inode_t * parent_inode_ptr; // local pointer on parent inode
3391	uint32_t links; // number of child inode parents
3392
3393	char dentry_name[CONFIG_VFS_MAX_NAME_LENGTH];
3394
3395	// get parent cluster and dentry local pointer
3396	parent_cxy = GET_CXY( dentry_xp );
3397	dentry_ptr = GET_PTR( dentry_xp );
3398
3399	// get a local copy of dentry name
3400	hal_remote_strcpy( XPTR( local_cxy , dentry_name ),
3401	XPTR( parent_cxy , &dentry_ptr->name ) );
3402
3403	// get parent_inode local pointer
3404	parent_inode_ptr = hal_remote_lpt( XPTR( parent_cxy , &dentry_ptr->parent ) );
3405
3406	// get child cluster and child_inode pointers
3407	child_inode_xp = hal_remote_l64( XPTR( parent_cxy , &dentry_ptr->child_xp ) );
3408	child_cxy = GET_CXY( child_inode_xp );
3409	child_inode_ptr = GET_PTR( child_inode_xp );
3410
3411	// remove dentry from parent_inode
3412	xhtab_remove( XPTR( parent_cxy , &parent_inode_ptr->children ),
3413	dentry_name,
3414	XPTR( parent_cxy , &dentry_ptr->children ) );
3415
3416	// remove dentry from child_inode
3417	xlist_unlink( XPTR( parent_cxy , &dentry_ptr->parents ) );
3418	links = hal_remote_atomic_add( XPTR( child_cxy , &child_inode_ptr->links ) , -1 );
3419
3420	// delete dentry descriptor
3421	if( parent_cxy == local_cxy )
3422	{
3423	vfs_dentry_destroy( dentry_ptr );
3424	}
3425	else
3426	{
3427	rpc_vfs_dentry_destroy_client( parent_cxy,
3428	dentry_ptr );
3429	}
3430
3431	// delete child_inode descriptor if last link
3432	if( links == 1 )
3433	{
3434	if( child_cxy == local_cxy )
3435	{
3436	vfs_inode_destroy( child_inode_ptr );
3437	}
3438	else
3439	{
3440	rpc_vfs_inode_destroy_client( child_cxy , child_inode_ptr );
3441	}
3442	}
3443
3444	} // end vfs_remove_child_from_parent()
3445
3446
3447
3448
3449	//////////////////////////////////////////////////////////////////////////////////////////
3450	// API used by VFS to access a specific FS
3451	//////////////////////////////////////////////////////////////////////////////////////////
3452
3453	//////////////////////////////////////////////
3454	error_t vfs_fs_move_page( xptr_t page_xp,
3455	cmd_type_t cmd_type )
3456	{
3457	error_t error = 0;
3458
3459	assert( (page_xp != XPTR_NULL) , "page pointer is NULL" );
3460
3461	page_t * page_ptr = GET_PTR( page_xp );
3462	cxy_t page_cxy = GET_CXY( page_xp );
3463
3464	// get local pointer on page mapper
3465	mapper_t * mapper = hal_remote_lpt( XPTR( page_cxy , &page_ptr->mapper ) );
3466
3467	assert( (mapper != NULL) , "no mapper for page" );
3468
3469	// get FS type
3470	vfs_fs_type_t fs_type = hal_remote_l32( XPTR( page_cxy , &mapper->type ) );
3471
3472	// call relevant FS function
3473	if( fs_type == FS_TYPE_FATFS )
3474	{
3475	error = fatfs_move_page( page_xp , cmd_type );
3476	}
3477	else if( fs_type == FS_TYPE_RAMFS )
3478	{
3479	assert( false , "should not be called for RAMFS\n" );
3480	}
3481	else if( fs_type == FS_TYPE_DEVFS )
3482	{
3483	assert( false , "should not be called for DEVFS\n" );
3484	}
3485	else
3486	{
3487	assert( false , "undefined file system type" );
3488	}
3489
3490	return error;
3491
3492	} // end vfs_fs_move_page()
3493
3494	////////////////////////////////////////////////
3495	error_t vfs_fs_add_dentry( vfs_inode_t * inode,
3496	vfs_dentry_t * dentry )
3497	{
3498	error_t error = 0;
3499
3500	assert( (inode != NULL) , "inode pointer is NULL" );
3501	assert( (dentry != NULL) , "dentry pointer is NULL" );
3502
3503	mapper_t * mapper = inode->mapper;
3504
3505	assert( (mapper != NULL) , "mapper pointer is NULL" );
3506
3507	// get FS type
3508	vfs_fs_type_t fs_type = mapper->type;
3509
3510	// call relevant FS function
3511	if( fs_type == FS_TYPE_FATFS )
3512	{
3513	error = fatfs_add_dentry( inode , dentry );
3514	}
3515	else if( fs_type == FS_TYPE_RAMFS )
3516	{
3517	error = 0; // does nothing for RAMFS
3518	}
3519	else if( fs_type == FS_TYPE_DEVFS )
3520	{
3521	error = 0; // does nothing for DEVFS
3522	}
3523	else
3524	{
3525	assert( false , "undefined file system type" );
3526	}
3527
3528	return error;
3529
3530	} // end vfs_fs_add_dentry()
3531
3532	///////////////////////////////////////////////////
3533	error_t vfs_fs_remove_dentry( vfs_inode_t * inode,
3534	vfs_dentry_t * dentry )
3535	{
3536	error_t error = 0;
3537
3538	assert( (inode != NULL) , "inode pointer is NULL" );
3539	assert( (dentry != NULL) , "dentry pointer is NULL" );
3540
3541	mapper_t * mapper = inode->mapper;
3542
3543	assert( (mapper != NULL) , "mapper pointer is NULL" );
3544
3545	// get FS type
3546	vfs_fs_type_t fs_type = mapper->type;
3547
3548	// call relevant FS function
3549	if( fs_type == FS_TYPE_FATFS )
3550	{
3551	error = fatfs_remove_dentry( inode , dentry );
3552	}
3553	else if( fs_type == FS_TYPE_RAMFS )
3554	{
3555	error = 0; // does nothing for RAMFS
3556	}
3557	else if( fs_type == FS_TYPE_DEVFS )
3558	{
3559	error = 0; // does nothing for DEVFS
3560	}
3561	else
3562	{
3563	assert( false , "undefined file system type" );
3564	}
3565
3566	return error;
3567
3568	} // end vfs_fs_remove_dentry()
3569
3570	////////////////////////////////////////////////
3571	error_t vfs_fs_new_dentry( vfs_inode_t * parent,
3572	char * name,
3573	xptr_t child_xp )
3574	{
3575	error_t error = 0;
3576
3577	// check arguments
3578	assert( (parent != NULL) , "parent pointer is NULL");
3579	assert( (child_xp != XPTR_NULL) , "child pointer is NULL");
3580
3581	// get parent inode FS type
3582	vfs_fs_type_t fs_type = parent->ctx->type;
3583
3584	// call relevant FS function
3585	if( fs_type == FS_TYPE_FATFS )
3586	{
3587	error = fatfs_new_dentry( parent , name , child_xp );
3588	}
3589	else if( fs_type == FS_TYPE_RAMFS )
3590	{
3591	assert( false , "should not be called for RAMFS" );
3592	}
3593	else if( fs_type == FS_TYPE_DEVFS )
3594	{
3595	assert( false , "should not be called for DEVFS" );
3596	}
3597	else
3598	{
3599	assert( false , "undefined file system type" );
3600	}
3601
3602	return error;
3603
3604	} // end vfs_fs_new_dentry()
3605
3606	///////////////////////////////////////////////////
3607	error_t vfs_fs_update_dentry( vfs_inode_t * inode,
3608	vfs_dentry_t * dentry,
3609	uint32_t size )
3610	{
3611	error_t error = 0;
3612
3613	// check arguments
3614	assert( (inode != NULL) , "inode pointer is NULL");
3615	assert( (dentry != NULL) , "dentry pointer is NULL");
3616
3617	// get parent inode FS type
3618	vfs_fs_type_t fs_type = inode->ctx->type;
3619
3620	// call relevant FS function
3621	if( fs_type == FS_TYPE_FATFS )
3622	{
3623	error = fatfs_update_dentry( inode , dentry , size );
3624	}
3625	else if( fs_type == FS_TYPE_RAMFS )
3626	{
3627	assert( false , "should not be called for RAMFS" );
3628	}
3629	else if( fs_type == FS_TYPE_DEVFS )
3630	{
3631	assert( false , "should not be called for DEVFS" );
3632	}
3633	else
3634	{
3635	assert( false , "undefined file system type" );
3636	}
3637
3638	return error;
3639
3640	} // end vfs_fs_update_dentry()
3641
3642	///////////////////////////////////////////////////
3643	error_t vfs_fs_get_user_dir( vfs_inode_t * inode,
3644	struct dirent * array,
3645	uint32_t max_dirent,
3646	uint32_t min_dentry,
3647	bool_t detailed,
3648	uint32_t * entries,
3649	bool_t * done )
3650	{
3651	error_t error = 0;
3652
3653	// check arguments
3654	assert( (inode != NULL) , "parent pointer is NULL");
3655	assert( (array != NULL) , "child pointer is NULL");
3656	assert( (detailed == false) , "detailed argument not supported\n");
3657
3658	// check inode type
3659	if( inode->type != INODE_TYPE_DIR )
3660	{
3661	printk("\n[ERROR] in %s : target inode is not a directory\n",
3662	__FUNCTION__ );
3663	return -1;
3664	}
3665
3666	// get parent inode FS type
3667	vfs_fs_type_t fs_type = inode->ctx->type;
3668
3669	// call relevant FS function
3670	if( fs_type == FS_TYPE_FATFS )
3671	{
3672	error = fatfs_get_user_dir( inode,
3673	array,
3674	max_dirent,
3675	min_dentry,
3676	detailed,
3677	entries,
3678	done );
3679	}
3680	else if( fs_type == FS_TYPE_RAMFS )
3681	{
3682	assert( false , "should not be called for RAMFS" );
3683	}
3684	else if( fs_type == FS_TYPE_DEVFS )
3685	{
3686	error = devfs_get_user_dir( inode,
3687	array,
3688	max_dirent,
3689	min_dentry,
3690	detailed,
3691	entries,
3692	done );
3693	}
3694	else
3695	{
3696	assert( false , "undefined file system type" );
3697	}
3698
3699	return error;
3700
3701	} // end vfs_fs_get_user_dir()
3702
3703	////////////////////////////////////////////////
3704	error_t vfs_fs_sync_inode( vfs_inode_t * inode )
3705	{
3706	error_t error = 0;
3707
3708	// check arguments
3709	assert( (inode != NULL) , "inode pointer is NULL");
3710
3711	// get inode FS type
3712	vfs_fs_type_t fs_type = inode->ctx->type;
3713
3714	// call relevant FS function
3715	if( fs_type == FS_TYPE_FATFS )
3716	{
3717	error = fatfs_sync_inode( inode );
3718	}
3719	else if( fs_type == FS_TYPE_RAMFS )
3720	{
3721	assert( false , "should not be called for RAMFS" );
3722	}
3723	else if( fs_type == FS_TYPE_DEVFS )
3724	{
3725	assert( false , "should not be called for DEVFS" );
3726	}
3727	else
3728	{
3729	assert( false , "undefined file system type" );
3730	}
3731
3732	return error;
3733
3734	} // end vfs_fs_sync_inode()
3735
3736	////////////////////////////////////////////////
3737	error_t vfs_fs_sync_fat( vfs_fs_type_t fs_type )
3738	{
3739	error_t error = 0;
3740
3741	// call relevant FS function
3742	if( fs_type == FS_TYPE_FATFS )
3743	{
3744	error = fatfs_sync_fat();
3745	}
3746	else if( fs_type == FS_TYPE_RAMFS )
3747	{
3748	assert( false , "should not be called for RAMFS" );
3749	}
3750	else if( fs_type == FS_TYPE_DEVFS )
3751	{
3752	assert( false , "should not be called for DEVFS" );
3753	}
3754	else
3755	{
3756	assert( false , "undefined file system type" );
3757	}
3758
3759	return error;
3760
3761	} // end vfs_fs_sync_fat()
3762
3763	//////////////////////////////////////////////////////
3764	error_t vfs_fs_sync_free_info( vfs_fs_type_t fs_type )
3765	{
3766	error_t error = 0;
3767
3768	// call relevant FS function
3769	if( fs_type == FS_TYPE_FATFS )
3770	{
3771	error = fatfs_sync_free_info();
3772	}
3773	else if( fs_type == FS_TYPE_RAMFS )
3774	{
3775	assert( false , "should not be called for RAMFS" );
3776	}
3777	else if( fs_type == FS_TYPE_DEVFS )
3778	{
3779	assert( false , "should not be called for DEVFS" );
3780	}
3781	else
3782	{
3783	assert( false , "undefined file system type" );
3784	}
3785
3786	return error;
3787
3788	} // end vfs_fs_sync_fat()
3789
3790	/////////////////////////////////////////////////
3791	error_t vfs_fs_cluster_alloc( uint32_t fs_type,
3792	uint32_t * cluster )
3793	{
3794	error_t error = 0;
3795
3796	// call relevant FS function
3797	if( fs_type == FS_TYPE_FATFS )
3798	{
3799	error = fatfs_cluster_alloc( cluster );
3800	}
3801	else if( fs_type == FS_TYPE_RAMFS )
3802	{
3803	assert( false , "should not be called for RAMFS" );
3804	}
3805	else if( fs_type == FS_TYPE_DEVFS )
3806	{
3807	assert( false , "should not be called for DEVFS" );
3808	}
3809	else
3810	{
3811	assert( false , "undefined file system type" );
3812	}
3813
3814	return error;
3815
3816	} // end vfs_fs_alloc_cluster()
3817
3818	////////////////////////////////////////////////
3819	error_t vfs_fs_release_inode( xptr_t inode_xp )
3820	{
3821	error_t error = 0;
3822
3823	assert( (inode_xp != XPTR_NULL) , "inode pointer is NULL")
3824
3825	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
3826	cxy_t inode_cxy = GET_CXY( inode_xp );
3827
3828	// get local pointer on page mapper
3829	mapper_t * mapper = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
3830
3831	assert( (mapper != NULL) , "mapper pointer is NULL")
3832
3833	// get FS type from mapper
3834	vfs_fs_type_t fs_type = hal_remote_l32( XPTR( inode_cxy , &mapper->type ) );
3835
3836	// call relevant FS function
3837	if( fs_type == FS_TYPE_FATFS )
3838	{
3839	error = fatfs_release_inode( inode_xp );
3840	}
3841	else if( fs_type == FS_TYPE_RAMFS )
3842	{
3843	assert( false , "should not be called for RAMFS" );
3844	}
3845	else if( fs_type == FS_TYPE_DEVFS )
3846	{
3847	assert( false , "should not be called for DEVFS" );
3848	}
3849	else
3850	{
3851	assert( false , "undefined file system type" );
3852	}
3853
3854	return error;
3855
3856	} // end vfs_fs_release_inode()
3857
3858

Note: See TracBrowser for help on using the repository browser.

Download in other formats: