Context Navigation

source: trunk/kernel/fs/vfs.c @ 638

Last change on this file since 638 was 635, checked in by alain, 5 years ago

This version is a major evolution: The physical memory allocators,
defined in the kmem.c, ppm.c, and kcm.c files have been modified
to support remote accesses. The RPCs that were previously user
to allocate physical memory in a remote cluster have been removed.
This has been done to cure a dead-lock in case of concurrent page-faults.

This version 2.2 has been tested on a (4 clusters / 2 cores per cluster)
TSAR architecture, for both the "sort" and the "fft" applications.

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	#if DEBUG_VFS_OPEN
684	uint32_t cycle = (uint32_t)hal_get_cycles();
685	if( DEBUG_VFS_OPEN < cycle )
686	printk("\n[%s] thread[%x,%x] enter for <%s> / root_inode (%x,%x) / cycle %d\n",
687	__FUNCTION__, process->pid, this->trdid, path, GET_CXY(root_xp), GET_PTR(root_xp), cycle );
688	#endif
689
690	// compute lookup working mode
691	lookup_mode = VFS_LOOKUP_OPEN;
692	if( (flags & O_DIR ) ) lookup_mode \|= VFS_LOOKUP_DIR;
693	if( (flags & O_CREAT ) ) lookup_mode \|= VFS_LOOKUP_CREATE;
694	if( (flags & O_EXCL ) ) lookup_mode \|= VFS_LOOKUP_EXCL;
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 argument
940	assert( (file_xp != XPTR_NULL) , "file_xp == XPTR_NULL" );
941
942	// get cluster and local pointer on remote file descriptor
943	file_cxy = GET_CXY( file_xp );
944	file_ptr = GET_PTR( file_xp );
945
946	// get local pointer on remote inode
947	inode_ptr = (vfs_inode_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
948
949	// build extended pointers on lock, offset and size
950	offset_xp = XPTR( file_cxy , &file_ptr->offset );
951	lock_xp = XPTR( file_cxy , &file_ptr->lock );
952	size_xp = XPTR( file_cxy , &inode_ptr->size );
953
954	// take file descriptor lock
955	remote_rwlock_wr_acquire( lock_xp );
956
957	if ( whence == SEEK_CUR ) // new = current + offset
958	{
959	new = hal_remote_l32( offset_xp ) + offset;
960	}
961	else if ( whence == SEEK_SET ) // new = offset
962	{
963	new = offset;
964	}
965	else if ( whence == SEEK_END ) // new = size + offset
966	{
967	new = hal_remote_l32( size_xp ) + offset;
968	}
969	else
970	{
971	printk("\n[ERROR] in %s : illegal whence value\n", __FUNCTION__ );
972	remote_rwlock_wr_release( lock_xp );
973	return -1;
974	}
975
976	#if DEBUG_VFS_LSEEK
977	uint32_t cycle = (uint32_t)hal_get_cycles();
978	thread_t * this = CURRENT_THREAD;
979	char name[CONFIG_VFS_MAX_NAME_LENGTH];
980	vfs_inode_get_name( XPTR( file_cxy , inode_ptr ) , name );
981	if( cycle > DEBUG_VFS_LSEEK )
982	printk("\n[%s] thread[%x,%x] for <%s> / new offset %d / cycle %d\n",
983	__FUNCTION__ , this->process->pid, this->trdid, name, new, cycle );
984	#endif
985
986	// set new offset
987	hal_remote_s32( offset_xp , new );
988
989	// release file descriptor lock
990	remote_rwlock_wr_release( lock_xp );
991
992	// success
993	if ( new_offset != NULL ) *new_offset = new;
994	return 0;
995
996	} // vfs_lseek()
997
998	////////////////////////////////////
999	error_t vfs_close( xptr_t file_xp,
1000	uint32_t file_id )
1001	{
1002	cxy_t file_cxy; // cluster containing the file descriptor.
1003	vfs_file_t * file_ptr; // local ponter on file descriptor
1004	cxy_t owner_cxy; // process owner cluster
1005	pid_t pid; // process identifier
1006	lpid_t lpid; // process local index
1007	xptr_t root_xp; // root of xlist (processes , or dentries)
1008	xptr_t lock_xp; // lock protecting the xlist
1009	xptr_t iter_xp; // iterator on xlist
1010	mapper_t * mapper_ptr; // local pointer on associated mapper
1011	vfs_inode_t * inode_ptr; // local pointer on associated inode
1012	uint32_t size; // current file size (from inode descriptor)
1013	error_t error;
1014
1015	char name[CONFIG_VFS_MAX_NAME_LENGTH]; // file name
1016
1017	// check argument
1018	assert( (file_xp != XPTR_NULL) , "file_xp is XPTR_NULL" );
1019
1020	thread_t * this = CURRENT_THREAD;
1021	process_t * process = this->process;
1022	cluster_t * cluster = LOCAL_CLUSTER;
1023
1024	// get file name
1025	vfs_file_get_name( file_xp , name );
1026
1027	#if DEBUG_VFS_CLOSE
1028	uint32_t cycle = (uint32_t)hal_get_cycles();
1029	if( DEBUG_VFS_CLOSE < cycle )
1030	printk("\n[%s] thread[%x,%x] enter for <%s> / cycle %d\n",
1031	__FUNCTION__, process->pid, this->trdid, name, cycle );
1032	#endif
1033
1034	// get cluster and local pointer on remote file descriptor
1035	file_cxy = GET_CXY( file_xp );
1036	file_ptr = GET_PTR( file_xp );
1037
1038	//////// 1) update all dirty pages from mapper to device
1039
1040	// get local pointer on mapper associated to file
1041	mapper_ptr = hal_remote_lpt( XPTR( file_cxy , &file_ptr->mapper ) );
1042
1043	// copy all dirty pages from mapper to device
1044	if( file_cxy == local_cxy )
1045	{
1046	error = mapper_sync( mapper_ptr );
1047	}
1048	else
1049	{
1050	rpc_mapper_sync_client( file_cxy,
1051	mapper_ptr,
1052	&error );
1053	}
1054
1055	if( error )
1056	{
1057	printk("\n[ERROR] in %s : cannot synchronise dirty pages for <%s>\n",
1058	__FUNCTION__, name );
1059	return -1;
1060	}
1061
1062	#if DEBUG_VFS_CLOSE
1063	if( DEBUG_VFS_CLOSE < cycle )
1064	printk("\n[%s] thread[%x,%x] synchronised mapper of <%s> to device\n",
1065	__FUNCTION__, process->pid, this->trdid, name );
1066	#endif
1067
1068	//////// 2) update file size in all parent directory mapper(s) and update device
1069
1070	// get local pointer on remote inode
1071	inode_ptr = hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
1072
1073	// get file size from remote inode
1074	size = hal_remote_l32( XPTR( file_cxy , &inode_ptr->size ) );
1075
1076	// get root of list of parents dentry
1077	root_xp = XPTR( file_cxy , &inode_ptr->parents );
1078
1079	// loop on all parents
1080	XLIST_FOREACH( root_xp , iter_xp )
1081	{
1082	// get pointers on parent directory dentry
1083	xptr_t parent_dentry_xp = XLIST_ELEMENT( iter_xp , vfs_dentry_t , parents );
1084	cxy_t parent_cxy = GET_CXY( parent_dentry_xp );
1085	vfs_dentry_t * parent_dentry_ptr = GET_PTR( parent_dentry_xp );
1086
1087	// get local pointer on parent directory inode
1088	vfs_inode_t * parent_inode_ptr = hal_remote_lpt( XPTR( parent_cxy,
1089	&parent_dentry_ptr->parent ) );
1090
1091	// get local pointer on parent directory mapper
1092	mapper_t * parent_mapper_ptr = hal_remote_lpt( XPTR( parent_cxy,
1093	&parent_inode_ptr->mapper ) );
1094
1095	// update dentry size in parent directory mapper
1096	if( parent_cxy == local_cxy )
1097	{
1098	error = vfs_fs_update_dentry( parent_inode_ptr,
1099	parent_dentry_ptr,
1100	size );
1101	}
1102	else
1103	{
1104	rpc_vfs_fs_update_dentry_client( parent_cxy,
1105	parent_inode_ptr,
1106	parent_dentry_ptr,
1107	size,
1108	&error );
1109	}
1110
1111	if( error )
1112	{
1113	printk("\n[ERROR] in %s : cannot update size in parent\n",
1114	__FUNCTION__ );
1115	return -1;
1116	}
1117
1118	#if DEBUG_VFS_CLOSE
1119	char parent_name[CONFIG_VFS_MAX_NAME_LENGTH];
1120	vfs_inode_get_name( XPTR( parent_cxy , parent_inode_ptr ) , parent_name );
1121	if( DEBUG_VFS_CLOSE < cycle )
1122	printk("\n[%s] thread[%x,%x] updated <%s> in <%s> / size = %d bytes\n",
1123	__FUNCTION__, process->pid, this->trdid, name, parent_name, size );
1124	#endif
1125
1126	// copy all dirty pages from parent mapper to device
1127	if( parent_cxy == local_cxy )
1128	{
1129	error = mapper_sync( parent_mapper_ptr );
1130	}
1131	else
1132	{
1133	rpc_mapper_sync_client( parent_cxy,
1134	parent_mapper_ptr,
1135	&error );
1136	}
1137
1138	if( error )
1139	{
1140	printk("\n[ERROR] in %s : cannot synchronise parent mapper to device\n",
1141	__FUNCTION__ );
1142	return -1;
1143	}
1144
1145	#if DEBUG_VFS_CLOSE
1146	if( DEBUG_VFS_CLOSE < cycle )
1147	printk("\n[%s] thread[%x,%x] synchonized mapper of parent <%s> to device\n",
1148	__FUNCTION__, process->pid, this->trdid, parent_name );
1149	#endif
1150
1151	}
1152
1153	//////// 3) loop on the process copies to reset all fd_array[file_id] entries
1154
1155	// get owner process cluster and lpid
1156	pid = process->pid;
1157	owner_cxy = CXY_FROM_PID( pid );
1158	lpid = LPID_FROM_PID( pid );
1159
1160	// get extended pointers on copies root and lock
1161	root_xp = XPTR( owner_cxy , &cluster->pmgr.copies_root[lpid] );
1162	lock_xp = XPTR( owner_cxy , &cluster->pmgr.copies_lock[lpid] );
1163
1164	// take the lock protecting the list of copies
1165	remote_queuelock_acquire( lock_xp );
1166
1167	XLIST_FOREACH( root_xp , iter_xp )
1168	{
1169	xptr_t process_xp = XLIST_ELEMENT( iter_xp , process_t , copies_list );
1170	cxy_t process_cxy = GET_CXY( process_xp );
1171	process_t * process_ptr = GET_PTR( process_xp );
1172
1173	xptr_t entry_xp = XPTR( process_cxy , &process_ptr->fd_array.array[file_id] );
1174	hal_remote_s64( entry_xp , XPTR_NULL );
1175	vfs_file_count_down( file_xp );
1176	hal_fence();
1177	}
1178
1179	// release the lock protecting the list of copies
1180	remote_queuelock_release( lock_xp );
1181
1182	#if DEBUG_VFS_CLOSE
1183	if( DEBUG_VFS_CLOSE < cycle )
1184	printk("\n[%s] thread[%x,%x] reset all fd-array copies for <%s>\n",
1185	__FUNCTION__, process->pid, this->trdid, name );
1186	#endif
1187
1188	//////// 4) release memory allocated to file descriptor in remote cluster
1189
1190	if( file_cxy == local_cxy ) // file cluster is local
1191	{
1192	vfs_file_destroy( file_ptr );
1193	}
1194	else // file cluster is local
1195	{
1196	rpc_vfs_file_destroy_client( file_cxy , file_ptr );
1197	}
1198
1199	#if DEBUG_VFS_CLOSE
1200	cycle = (uint32_t)hal_get_cycles();
1201	if( DEBUG_VFS_CLOSE < cycle )
1202	printk("\n[%s] thread[%x,%x] exit / closed <%s> in process %x / cycle %d\n",
1203	__FUNCTION__, process->pid, this->trdid, name, process->pid, cycle );
1204	#endif
1205
1206	return 0;
1207
1208	} // end vfs_close()
1209
1210	////////////////////////////////////
1211	error_t vfs_mkdir( xptr_t root_xp,
1212	char * path,
1213	uint32_t rights )
1214	{
1215	error_t error;
1216	xptr_t vfs_root_xp; // extended pointer on VFS root inode
1217	vfs_inode_t * vfs_root_ptr; // local pointer on VFS root inode
1218	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
1219	xptr_t lock_xp; // extended pointer on lock protecting Inode Tree
1220	xptr_t inode_xp; // extended pointer on new directory inode
1221	vfs_inode_t * inode_ptr; // local pointer on new directory inode
1222	cxy_t inode_cxy; // new directory inode cluster identifier
1223	xptr_t dentry_xp; // extended pointer on new dentry
1224	vfs_dentry_t * dentry_ptr; // new dentry local pointer
1225	xptr_t parent_xp; // extended pointer on parent inode
1226	vfs_inode_t * parent_ptr; // local pointer on parent inode
1227	cxy_t parent_cxy; // parent inode cluster identifier
1228	vfs_ctx_t * parent_ctx_ptr; // local pointer on parent inode context
1229	uint32_t parent_fs_type; // parent inode file system type
1230
1231	xptr_t parents_root_xp; // extended pointer on parents field in inode (root)
1232	xptr_t parents_entry_xp; // extended pointer on parents field in dentry
1233	xptr_t children_xhtab_xp; // extended pointer on children field in inode (root)
1234	xptr_t children_entry_xp; // extended pointer on children field in dentry
1235
1236	char last_name[CONFIG_VFS_MAX_NAME_LENGTH];
1237
1238	thread_t * this = CURRENT_THREAD;
1239	process_t * process = this->process;
1240
1241	#if DEBUG_VFS_MKDIR
1242	char root_name[CONFIG_VFS_MAX_NAME_LENGTH];
1243	vfs_inode_get_name( root_xp , root_name );
1244	uint32_t cycle = (uint32_t)hal_get_cycles();
1245	if( DEBUG_VFS_MKDIR < cycle )
1246	printk("\n[%s] thread[%x,%x] enter / root <%s> / path <%s> / cycle %d\n",
1247	__FUNCTION__, process->pid, this->trdid, root_name, path, cycle );
1248	#endif
1249
1250	// build extended pointer on lock protecting Inode Tree (in VFS root inode)
1251	vfs_root_xp = process->vfs_root_xp;
1252	vfs_root_ptr = GET_PTR( vfs_root_xp );
1253	vfs_root_cxy = GET_CXY( vfs_root_xp );
1254	lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
1255
1256	// take the lock protecting Inode Tree in write mode
1257	remote_rwlock_wr_acquire( lock_xp );
1258
1259	// 1. get pointers on parent inode
1260	error = vfs_lookup( root_xp,
1261	path,
1262	VFS_LOOKUP_DIR \| VFS_LOOKUP_PARENT,
1263	&parent_xp,
1264	last_name );
1265	if( error )
1266	{
1267	remote_rwlock_wr_release( lock_xp );
1268	printk("\n[ERROR] in %s : cannot get parent inode for <%s>\n",
1269	__FUNCTION__, path );
1270	return -1;
1271	}
1272
1273	// get parent inode cluster and local pointer
1274	parent_cxy = GET_CXY( parent_xp );
1275	parent_ptr = GET_PTR( parent_xp );
1276
1277	#if( DEBUG_VFS_MKDIR & 1 )
1278	if( DEBUG_VFS_MKDIR < cycle )
1279	printk("\n[%s] thread[%x,%x] get parent inode (%x,%x) for <%s>\n",
1280	__FUNCTION__, process->pid, this->trdid, parent_cxy, parent_ptr, path );
1281	#endif
1282
1283	// get parent inode context, and FS type
1284	parent_ctx_ptr = hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->ctx ) );
1285	parent_fs_type = hal_remote_l32( XPTR( parent_cxy , &parent_ctx_ptr->type ) );
1286
1287	// 2. create one new dentry in parent cluster
1288	if( parent_cxy == local_cxy )
1289	{
1290	error = vfs_dentry_create( parent_fs_type,
1291	last_name,
1292	&dentry_xp );
1293	}
1294	else
1295	{
1296	rpc_vfs_dentry_create_client( parent_cxy,
1297	parent_fs_type,
1298	last_name,
1299	&dentry_xp,
1300	&error );
1301	}
1302
1303	if( error )
1304	{
1305	remote_rwlock_wr_release( lock_xp );
1306	printk("\n[ERROR] in %s : cannot create new dentry in cluster %x for <%s>\n",
1307	__FUNCTION__, parent_cxy, path );
1308	return -1;
1309	}
1310
1311	// get local pointer on dentry
1312	dentry_ptr = GET_PTR( dentry_xp );
1313
1314	#if( DEBUG_VFS_MKDIR & 1 )
1315	if( DEBUG_VFS_MKDIR < cycle )
1316	printk("\n[%s] thread[%x,%x] created new dentry (%x,%x) for <%s>\n",
1317	__FUNCTION__, process->pid, this->trdid, parent_cxy, dentry_ptr, path );
1318	#endif
1319
1320	// 3. create new directory inode
1321	// TODO : define attr / uid / gid
1322	uint32_t attr = 0;
1323	uint32_t uid = 0;
1324	uint32_t gid = 0;
1325
1326	// select a target cluster for new inode
1327	inode_cxy = cluster_random_select();
1328
1329	if( inode_cxy == local_cxy ) // target cluster is local
1330	{
1331	error = vfs_inode_create( parent_fs_type,
1332	attr,
1333	rights,
1334	uid,
1335	gid,
1336	&inode_xp );
1337	}
1338	else // target cluster is remote
1339	{
1340	rpc_vfs_inode_create_client( inode_cxy,
1341	parent_fs_type,
1342	attr,
1343	rights,
1344	uid,
1345	gid,
1346	&inode_xp,
1347	&error );
1348	}
1349
1350	if( error )
1351	{
1352	remote_rwlock_wr_release( lock_xp );
1353	printk("\n[ERROR] in %s : cannot create new inode in cluster %x for <%s>\n",
1354	__FUNCTION__ , inode_cxy , path );
1355	if( parent_cxy == local_cxy ) vfs_dentry_destroy( dentry_ptr );
1356	else rpc_vfs_dentry_destroy_client( parent_cxy , dentry_ptr );
1357	return -1;
1358	}
1359
1360	// get new inode local pointer
1361	inode_ptr = GET_PTR( inode_xp );
1362
1363	// update inode "type" field
1364	hal_remote_s32( XPTR( inode_cxy , &inode_ptr->type ) , INODE_TYPE_DIR );
1365
1366	#if(DEBUG_VFS_MKDIR & 1)
1367	if( DEBUG_VFS_MKDIR < cycle )
1368	printk("\n[%s] thread[%x,%x] created new inode (%x,%x) for <%s>\n",
1369	__FUNCTION__ , process->pid, this->trdid, inode_cxy, inode_ptr, path );
1370	#endif
1371
1372	// 4. register dentry in new inode list of parents
1373	parents_root_xp = XPTR( inode_cxy , &inode_ptr->parents );
1374	parents_entry_xp = XPTR( parent_cxy , &dentry_ptr->parents );
1375	xlist_add_first( parents_root_xp , parents_entry_xp );
1376	hal_remote_atomic_add( XPTR( inode_cxy , &inode_ptr->links ) , 1 );
1377
1378	// 5. register dentry in parent inode
1379	children_xhtab_xp = XPTR( parent_cxy , &parent_ptr->children );
1380	children_entry_xp = XPTR( parent_cxy , &dentry_ptr->children );
1381	xhtab_insert( children_xhtab_xp , last_name , children_entry_xp );
1382
1383	// 6. update "parent" and "child_xp" fields in dentry
1384	hal_remote_s64( XPTR( parent_cxy , &dentry_ptr->child_xp ) , inode_xp );
1385	hal_remote_spt( XPTR( parent_cxy , &dentry_ptr->parent ) , parent_ptr );
1386
1387	#if(DEBUG_VFS_MKDIR & 1)
1388	if( DEBUG_VFS_MKDIR < cycle )
1389	printk("\n[%s] thread[%x,%x] updated Inode Tree for <%s>\n",
1390	__FUNCTION__, process->pid, this->trdid, path );
1391	#endif
1392
1393	// 7. create the two special dentries <.> and <..> in new directory
1394	// both the new directory mapper, and the Inode Tree are updated
1395	error = vfs_add_special_dentries( inode_xp,
1396	parent_xp );
1397
1398	if( error )
1399	{
1400	remote_rwlock_wr_release( lock_xp );
1401	printk("\n[ERROR] in %s : cannot create new inode in cluster %x for <%s>\n",
1402	__FUNCTION__ , inode_cxy , path );
1403	if( parent_cxy == local_cxy ) vfs_dentry_destroy( dentry_ptr );
1404	else rpc_vfs_dentry_destroy_client( parent_cxy , dentry_ptr );
1405	return -1;
1406	}
1407
1408	// release the lock protecting Inode Tree
1409	remote_rwlock_wr_release( lock_xp );
1410
1411	// 8. update parent directory mapper
1412	// and synchronize the parent directory on IOC device
1413	if (parent_cxy == local_cxy)
1414	{
1415	error = vfs_fs_add_dentry( parent_ptr,
1416	dentry_ptr );
1417	}
1418	else
1419	{
1420	rpc_vfs_fs_add_dentry_client( parent_cxy,
1421	parent_ptr,
1422	dentry_ptr,
1423	&error );
1424	}
1425
1426	if( error )
1427	{
1428	printk("\n[ERROR] in %s : cannot update parent directory for <%s>\n",
1429	__FUNCTION__, path );
1430	return -1;
1431	}
1432
1433	#if(DEBUG_VFS_MKDIR & 1)
1434	if( DEBUG_VFS_MKDIR < cycle )
1435	printk("\n[%s] thread[%x,%x] updated parent dir (mapper and IOC) for <%s>\n",
1436	__FUNCTION__, process->pid, this->trdid, path );
1437	#endif
1438
1439	return 0;
1440
1441	} // end vfs_mkdir()
1442
1443	///////////////////////////////////////
1444	error_t vfs_link( xptr_t old_root_xp,
1445	char * old_path,
1446	xptr_t new_root_xp,
1447	char * new_path )
1448	{
1449	error_t error;
1450	xptr_t vfs_root_xp; // extended pointer on VFS root inode
1451	vfs_inode_t * vfs_root_ptr; // local pointer on VFS root inode
1452	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
1453	xptr_t lock_xp; // extended pointer on lock protecting Inode Tree
1454	xptr_t inode_xp; // extended pointer on target inode
1455	vfs_inode_t * inode_ptr; // local pointer on target inode
1456	cxy_t inode_cxy; // target inode cluster identifier
1457	uint32_t inode_type; // target inode type
1458	vfs_ctx_t * inode_ctx_ptr; // local pointer on target inode context
1459	uint32_t inode_fs_type; // target inode file system type
1460	xptr_t dentry_xp; // extended pointer on new dentry
1461	vfs_dentry_t * dentry_ptr; // target dentry local pointer
1462	xptr_t new_parent_xp; // extended pointer on new parent inode
1463	vfs_inode_t * new_parent_ptr; // local pointer on new parent inode
1464	cxy_t new_parent_cxy; // new parent inode cluster identifier
1465
1466	xptr_t parents_root_xp; // extended pointer on parents field in inode (root)
1467	xptr_t parents_entry_xp; // extended pointer on parents field in dentry
1468	xptr_t children_xhtab_xp; // extended pointer on children field in inode (root)
1469	xptr_t children_entry_xp; // extended pointer on children field in dentry
1470
1471	char new_name[CONFIG_VFS_MAX_NAME_LENGTH];
1472
1473	thread_t * this = CURRENT_THREAD;
1474	process_t * process = this->process;
1475
1476	#if DEBUG_VFS_LINK
1477	char old_root_name[CONFIG_VFS_MAX_NAME_LENGTH];
1478	char new_root_name[CONFIG_VFS_MAX_NAME_LENGTH];
1479	vfs_inode_get_name( old_root_xp , old_root_name );
1480	vfs_inode_get_name( new_root_xp , new_root_name );
1481	uint32_t cycle = (uint32_t)hal_get_cycles();
1482	if( DEBUG_VFS_LINK < cycle )
1483	printk("\n[%s] thread[%x,%x] enter / old_root <%s> / old_path <%s> / "
1484	"new_root <%s> / new_path <%s> / cycle %d\n",
1485	__FUNCTION__, process->pid, this->trdid,
1486	old_root_name, old_path, new_root_name, new_path, cycle );
1487	#endif
1488
1489	// build extended pointer on lock protecting Inode Tree (in VFS root inode)
1490	vfs_root_xp = process->vfs_root_xp;
1491	vfs_root_ptr = GET_PTR( vfs_root_xp );
1492	vfs_root_cxy = GET_CXY( vfs_root_xp );
1493	lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
1494
1495	// take the lock protecting Inode Tree in write mode
1496	remote_rwlock_wr_acquire( lock_xp );
1497
1498	// get extended pointer on target inode
1499	error = vfs_lookup( old_root_xp,
1500	old_path,
1501	0,
1502	&inode_xp,
1503	NULL );
1504	if( error )
1505	{
1506	remote_rwlock_wr_release( lock_xp );
1507	printk("\n[ERROR] in %s : cannot get target inode for <%s>\n",
1508	__FUNCTION__, old_path );
1509	return -1;
1510	}
1511
1512	#if( DEBUG_VFS_LINK & 1 )
1513	if( DEBUG_VFS_LINK < cycle )
1514	printk("\n[%s] thread[%x,%x] get child inode (%x,%x) for <%s>\n",
1515	__FUNCTION__, process->pid, this->trdid,
1516	GET_CXY(inode_xp), GET_PTR(inode_xp), old_path, cycle );
1517	#endif
1518
1519	// get extended pointer on parent inode in new path
1520	error = vfs_lookup( new_root_xp,
1521	new_path,
1522	VFS_LOOKUP_PARENT,
1523	&new_parent_xp,
1524	new_name );
1525	if( error )
1526	{
1527	remote_rwlock_wr_release( lock_xp );
1528	printk("\n[ERROR] in %s : cannot get parent inode for <%s>\n",
1529	__FUNCTION__, new_path );
1530	return -1;
1531	}
1532
1533	#if( DEBUG_VFS_LINK & 1 )
1534	if( DEBUG_VFS_LINK < cycle )
1535	printk("\n[%s] thread[%x,%x] get parent inode (%x,%x) for <%s>\n",
1536	__FUNCTION__, process->pid, this->trdid,
1537	GET_CXY(new_parent_xp), GET_PTR(new_parent_xp), new_path );
1538	#endif
1539
1540	// get target inode cluster and local pointer
1541	inode_cxy = GET_CXY( inode_xp );
1542	inode_ptr = GET_PTR( inode_xp );
1543
1544	// get target inode type, context, and FS type
1545	inode_type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
1546	inode_ctx_ptr = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->ctx ) );
1547	inode_fs_type = hal_remote_l32( XPTR( inode_cxy , &inode_ctx_ptr->type ) );
1548
1549	// get new parent inode cluster an local pointer
1550	new_parent_ptr = GET_PTR( new_parent_xp );
1551	new_parent_cxy = GET_CXY( new_parent_xp );
1552
1553	///////////////////////////////////////////////////////////////////////
1554	if( (inode_type == INODE_TYPE_FILE) \|\| (inode_type == INODE_TYPE_DIR) )
1555	{
1556	// 1. create one new dentry
1557	if( new_parent_cxy == local_cxy )
1558	{
1559	error = vfs_dentry_create( inode_fs_type,
1560	new_name,
1561	&dentry_xp );
1562	}
1563	else
1564	{
1565	rpc_vfs_dentry_create_client( new_parent_cxy,
1566	inode_fs_type,
1567	new_name,
1568	&dentry_xp,
1569	&error );
1570	}
1571
1572	if( error )
1573	{
1574	remote_rwlock_wr_release( lock_xp );
1575	printk("\n[ERROR] in %s : cannot create new dentry for <%s>\n",
1576	__FUNCTION__, new_path );
1577	return -1;
1578	}
1579
1580	// get local pointer on dentry
1581	dentry_ptr = GET_PTR( dentry_xp );
1582
1583	// 2. register dentry in target inode
1584	parents_root_xp = XPTR( inode_cxy , &inode_ptr->parents );
1585	parents_entry_xp = XPTR( new_parent_cxy , &dentry_ptr->parents );
1586	xlist_add_first( parents_root_xp , parents_entry_xp );
1587	hal_remote_atomic_add( XPTR( inode_cxy , &inode_ptr->links ) , 1 );
1588
1589	// 3. register dentry in parent inode
1590	children_xhtab_xp = XPTR( new_parent_cxy , &new_parent_ptr->children );
1591	children_entry_xp = XPTR( new_parent_cxy , &dentry_ptr->children );
1592	xhtab_insert( children_xhtab_xp , new_name , children_entry_xp );
1593
1594	// 4. update "parent" and "child_xp" fields in dentry
1595	hal_remote_s64( XPTR( new_parent_cxy , &dentry_ptr->child_xp ) , inode_xp );
1596	hal_remote_spt( XPTR( new_parent_cxy , &dentry_ptr->parent ) , new_parent_ptr );
1597
1598	#if(DEBUG_VFS_LINK & 1)
1599	if( DEBUG_VFS_LINK < cycle )
1600	printk("\n[%s] thread[%x,%x] updated Inode Tree / old <%s> / new <%s>\n",
1601	__FUNCTION__, process->pid, this->trdid, old_path, new_path );
1602	vfs_display( new_parent_xp );
1603	#endif
1604
1605	// release the lock protecting Inode Tree
1606	remote_rwlock_wr_release( lock_xp );
1607
1608	// 5. update new parent directory mapper in Inode Tree
1609	// and synchronize the parent directory on IOC device
1610	if (new_parent_cxy == local_cxy)
1611	{
1612	error = vfs_fs_add_dentry( new_parent_ptr,
1613	dentry_ptr );
1614	}
1615	else
1616	{
1617	rpc_vfs_fs_add_dentry_client( new_parent_cxy,
1618	new_parent_ptr,
1619	dentry_ptr,
1620	&error );
1621	}
1622	if( error )
1623	{
1624	printk("\n[ERROR] in %s : cannot update new parent directory for <%s>\n",
1625	__FUNCTION__, new_path );
1626	return -1;
1627	}
1628
1629	#if(DEBUG_VFS_LINK & 1)
1630	if( DEBUG_VFS_LINK < cycle )
1631	printk("\n[%s] thread[%x,%x] updated new parent dir (mapper and IOC) / old <%s> / new <%s>\n",
1632	__FUNCTION__, process->pid, this->trdid, old_path, new_path );
1633	#endif
1634	return 0;
1635	}
1636	else
1637	{
1638	// release the lock protecting Inode Tree
1639	remote_rwlock_wr_release( lock_xp );
1640
1641	printk("\n[ERROR] in %s : unsupported inode type %s\n",
1642	__FUNCTION__ , vfs_inode_type_str( inode_type ) );
1643	return -1;
1644	}
1645
1646	} // end vfs_link()
1647
1648	/////////////////////////////////////
1649	error_t vfs_unlink( xptr_t root_xp,
1650	char * path )
1651	{
1652	error_t error;
1653	xptr_t vfs_root_xp; // extended pointer on VFS root inode
1654	vfs_inode_t * vfs_root_ptr; // local_pointer on VFS root inode
1655	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
1656	xptr_t lock_xp; // extended pointer on lock protecting Inode Tree
1657	xptr_t parent_xp; // extended pointer on target inode
1658	cxy_t parent_cxy; // target inode cluster identifier
1659	vfs_inode_t * parent_ptr; // target inode local pointer
1660	xptr_t inode_xp; // extended pointer on target inode
1661	cxy_t inode_cxy; // target inode cluster identifier
1662	vfs_inode_t * inode_ptr; // target inode local pointer
1663	uint32_t inode_links; // target inode links count
1664	vfs_inode_type_t inode_type; // target inode type
1665	uint32_t inode_children; // target inode number of children
1666	xptr_t dentry_xp; // extended pointer on dentry to unlink
1667	vfs_dentry_t * dentry_ptr; // local pointer on dentry to unlink
1668	vfs_ctx_t * ctx_ptr; // local pointer on FS context
1669	vfs_fs_type_t fs_type; // File system type
1670
1671	char name[CONFIG_VFS_MAX_NAME_LENGTH]; // name of link to remove
1672
1673	thread_t * this = CURRENT_THREAD;
1674	process_t * process = this->process;
1675
1676	#if DEBUG_VFS_UNLINK
1677	uint32_t cycle = (uint32_t)hal_get_cycles();
1678	char root_name[CONFIG_VFS_MAX_NAME_LENGTH];
1679	vfs_inode_get_name( root_xp , root_name );
1680	if( DEBUG_VFS_UNLINK < cycle )
1681	printk("\n[%s] thread[%x,%x] : enter for root <%s> / path <%s> / cycle %d\n",
1682	__FUNCTION__, process->pid, this->trdid, root_name, path, cycle );
1683	#endif
1684
1685	// build extended pointer on lock protecting Inode Tree (in VFS root inode)
1686	vfs_root_xp = process->vfs_root_xp;
1687	vfs_root_ptr = GET_PTR( vfs_root_xp );
1688	vfs_root_cxy = GET_CXY( vfs_root_xp );
1689	lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
1690
1691	// take the lock protecting Inode Tree
1692	remote_rwlock_wr_acquire( lock_xp );
1693
1694	// get extended pointer on parent inode
1695	error = vfs_lookup( root_xp,
1696	path,
1697	VFS_LOOKUP_PARENT,
1698	&parent_xp,
1699	name );
1700	if( error )
1701	{
1702	remote_rwlock_wr_release( lock_xp );
1703	printk("\n[ERROR] in %s : cannot get parent inode for <%s> in <%s>\n",
1704	__FUNCTION__, name, path );
1705	return -1;
1706	}
1707
1708	// get parent inode cluster and local pointer
1709	parent_cxy = GET_CXY( parent_xp );
1710	parent_ptr = GET_PTR( parent_xp );
1711
1712	#if( DEBUG_VFS_UNLINK & 1 )
1713	char parent_name[CONFIG_VFS_MAX_NAME_LENGTH];
1714	vfs_inode_get_name( parent_xp , parent_name );
1715	if( DEBUG_VFS_UNLINK < cycle )
1716	printk("\n[%s] thread[%x,%x] : parent inode <%s> is (%x,%x)\n",
1717	__FUNCTION__, process->pid, this->trdid, parent_name, parent_cxy, parent_ptr );
1718	#endif
1719
1720	// build extended pointer on parent inode "children" xhtab
1721	xptr_t children_xp = XPTR( parent_cxy , &parent_ptr->children );
1722
1723	// try to get extended pointer on dentry from Inode Tree
1724	dentry_xp = xhtab_lookup( children_xp , name );
1725
1726	// when dentry not found in Inode Tree, try to get it from inode tree
1727
1728	if( dentry_xp == XPTR_NULL ) // miss target dentry in Inode Tree
1729	{
1730
1731	#if( DEBUG_VFS_UNLINK & 1 )
1732	if( DEBUG_VFS_UNLINK < cycle )
1733	printk("\n[%s] thread[%x,%x] : inode <%s> not found => scan parent mapper\n",
1734	__FUNCTION__, process->pid, this->trdid, name );
1735	#endif
1736	// get parent inode FS type
1737	ctx_ptr = hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->ctx ) );
1738	fs_type = hal_remote_l32( XPTR( parent_cxy , &ctx_ptr->type ) );
1739
1740	// select a cluster for new inode
1741	inode_cxy = cluster_random_select();
1742
1743	// speculatively insert a new child dentry/inode couple in inode tree
1744	error = vfs_add_child_in_parent( inode_cxy,
1745	fs_type,
1746	parent_xp,
1747	name,
1748	&dentry_xp,
1749	&inode_xp );
1750	if( error )
1751	{
1752	printk("\n[ERROR] in %s : cannot create inode <%s> in path <%s>\n",
1753	__FUNCTION__ , name, path );
1754
1755	vfs_remove_child_from_parent( dentry_xp );
1756	return -1;
1757	}
1758
1759	// get local pointers on new dentry and new inode descriptors
1760	inode_ptr = GET_PTR( inode_xp );
1761	dentry_ptr = GET_PTR( dentry_xp );
1762
1763	// scan parent mapper to find the missing dentry, and complete
1764	// initialisation of new dentry and new inode descriptors In Inode Tree
1765	if( parent_cxy == local_cxy )
1766	{
1767	error = vfs_fs_new_dentry( parent_ptr,
1768	name,
1769	inode_xp );
1770	}
1771	else
1772	{
1773	rpc_vfs_fs_new_dentry_client( parent_cxy,
1774	parent_ptr,
1775	name,
1776	inode_xp,
1777	&error );
1778	}
1779
1780	if ( error ) // dentry not found in parent mapper
1781	{
1782	printk("\n[ERROR] in %s : cannot get dentry <%s> in path <%s>\n",
1783	__FUNCTION__ , name, path );
1784	return -1;
1785	}
1786
1787	#if (DEBUG_VFS_UNLINK & 1)
1788	if( DEBUG_VFS_UNLINK < cycle )
1789	printk("\n[%s] thread[%x,%x] : created missing inode & dentry <%s> in cluster %x\n",
1790	__FUNCTION__, process->pid, this->trdid, name, inode_cxy );
1791	#endif
1792
1793	}
1794	else // found target dentry in Inode Tree
1795	{
1796	dentry_ptr = GET_PTR( dentry_xp );
1797
1798	// get pointer on target inode from dentry
1799	inode_xp = hal_remote_l64( XPTR( parent_cxy , &dentry_ptr->child_xp ) );
1800	inode_cxy = GET_CXY( inode_xp );
1801	inode_ptr = GET_PTR( inode_xp );
1802	}
1803
1804	// At this point the Inode Tree contains the target dentry and child inode
1805	// we can safely remove this dentry from both the parent mapper, and the Inode Tree.
1806
1807	#if( DEBUG_VFS_UNLINK & 1 )
1808	if( DEBUG_VFS_UNLINK < cycle )
1809	printk("\n[%s] thread[%x,%x] : dentry (%x,%x) / inode (%x,%x)\n",
1810	__FUNCTION__, process->pid, this->trdid, parent_cxy, dentry_ptr, inode_cxy, inode_ptr );
1811	#endif
1812
1813	// get target inode "type" and "links"
1814	inode_type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
1815	inode_links = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->links ) );
1816
1817	///////////////////////////////////////////////////////////////////////
1818	if( (inode_type == INODE_TYPE_FILE) \|\| (inode_type == INODE_TYPE_DIR) )
1819	{
1820
1821	#if( DEBUG_VFS_UNLINK & 1 )
1822	if( DEBUG_VFS_UNLINK < cycle )
1823	printk("\n[%s] thread[%x,%x] : unlink inode <%s> / type %s / %d links\n",
1824	__FUNCTION__, process->pid, this->trdid, name, vfs_inode_type_str(inode_type), inode_links );
1825	#endif
1826
1827	// 1. Release clusters allocated to target inode
1828	// and synchronize the FAT on IOC device if last link.
1829	if( inode_links == 1 )
1830	{
1831	// build extended pointer on target inode "children" number
1832	xptr_t inode_children_xp = XPTR( inode_cxy , &inode_ptr->children.items );
1833
1834	// get target inode number of children
1835	inode_children = hal_remote_l32( inode_children_xp );
1836
1837	// check no children
1838	if( inode_children != 0 )
1839	{
1840	remote_rwlock_wr_release( lock_xp );
1841	printk("\n[ERROR] in %s : cannot remove <%s> inode that has children\n",
1842	__FUNCTION__, path );
1843	return -1;
1844	}
1845
1846	// release clusters on IOC device
1847	error = vfs_fs_release_inode( inode_xp );
1848
1849	if( error )
1850	{
1851	remote_rwlock_wr_release( lock_xp );
1852	printk("\n[ERROR] in %s : cannot update FAT mapper to remove <%s> inode\n",
1853	__FUNCTION__ , path );
1854	return -1;
1855	}
1856
1857	#if(DEBUG_VFS_UNLINK & 1)
1858	if( DEBUG_VFS_UNLINK < cycle )
1859	printk("\n[%s] thread[%x,%x] removed <%s> inode from FAT (mapper and IOC device)\n",
1860	__FUNCTION__, process->pid, this->trdid, path );
1861	#endif
1862	}
1863
1864	// 2. update parent directory mapper
1865	// and synchronize the parent directory on IOC device
1866	if (parent_cxy == local_cxy)
1867	{
1868	error = vfs_fs_remove_dentry( parent_ptr,
1869	dentry_ptr );
1870	}
1871	else
1872	{
1873	rpc_vfs_fs_remove_dentry_client( parent_cxy,
1874	parent_ptr,
1875	dentry_ptr,
1876	&error );
1877	}
1878
1879	if( error )
1880	{
1881	remote_rwlock_wr_release( lock_xp );
1882	printk("\n[ERROR] in %s : cannot update dentry on device for <%s>\n",
1883	__FUNCTION__ , path );
1884	return -1;
1885	}
1886
1887	#if(DEBUG_VFS_UNLINK & 1)
1888	if( DEBUG_VFS_UNLINK < cycle )
1889	printk("\n[%s] thread[%x,%x] removed <%s> inode from parent dir (mapper and IOC device)\n",
1890	__FUNCTION__, process->pid, this->trdid, path );
1891	#endif
1892	// 3. remove dentry from Inode Tree (and associated chils inode when last link)
1893	vfs_remove_child_from_parent( dentry_xp );
1894
1895	// release the lock protecting Inode Tree
1896	remote_rwlock_wr_release( lock_xp );
1897
1898	#if DEBUG_VFS_UNLINK
1899	if( DEBUG_VFS_UNLINK < cycle )
1900	printk("\n[%s] thread[%x,%x] exit / removed <%s> inode from Inode Tree / cycle %d\n",
1901	__FUNCTION__, process->pid, this->trdid, path, cycle );
1902	#endif
1903	return 0;
1904	}
1905	else
1906	{
1907	remote_rwlock_wr_release( lock_xp );
1908	printk("\n[ERROR] in %s : unsupported inode type %s\n",
1909	__FUNCTION__ , vfs_inode_type_str( inode_type ) );
1910	return -1;
1911	}
1912
1913	} // end vfs_unlink()
1914
1915	////////////////////////////////////////////////
1916	error_t vfs_stat( xptr_t root_inode_xp,
1917	char * path,
1918	struct stat * st )
1919	{
1920	error_t error;
1921	xptr_t inode_xp; // extended pointer on target inode
1922	vfs_inode_t * inode_ptr; // local pointer on target inode
1923	cxy_t inode_cxy; // target inode cluster identifier
1924	xptr_t vfs_root_xp; // extended pointer on VFS root inode
1925	vfs_inode_t * vfs_root_ptr; // local_pointer on VFS root inode
1926	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
1927	xptr_t lock_xp; // extended pointer on lock protecting Inode Tree
1928
1929	thread_t * this = CURRENT_THREAD;
1930	process_t * process = this->process;
1931
1932	// build extended pointer on lock protecting Inode Tree (in VFS root inode)
1933	vfs_root_xp = process->vfs_root_xp;
1934	vfs_root_ptr = GET_PTR( vfs_root_xp );
1935	vfs_root_cxy = GET_CXY( vfs_root_xp );
1936	lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
1937
1938	// get the lock protecting Inode Tree in read mode
1939	remote_rwlock_rd_acquire( lock_xp );
1940
1941	// get extended pointer on target inode
1942	error = vfs_lookup( root_inode_xp,
1943	path,
1944	0,
1945	&inode_xp,
1946	NULL );
1947
1948	// release the lock protecting Inode Tree
1949	remote_rwlock_rd_release( lock_xp );
1950
1951	if( error )
1952	{
1953	printk("\n[ERROR] in %s : cannot found inode <%s>\n",
1954	__FUNCTION__ , path );
1955	return -1;
1956	}
1957
1958	// get cluster and local pointer on inode descriptor
1959	inode_ptr = GET_PTR( inode_xp );
1960	inode_cxy = GET_CXY( inode_xp );
1961
1962	// get relevant infos from inode descriptor
1963	uint32_t inum = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->inum ) );
1964	uint32_t size = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->size ) );
1965	uint32_t uid = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->uid ) );
1966	uint32_t gid = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->gid ) );
1967	uint32_t type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
1968	uint32_t rights = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->rights ) );
1969
1970	// set stat structure fields
1971	st->st_ino = inum;
1972	st->st_gid = gid;
1973	st->st_uid = uid;
1974	st->st_size = size;
1975	st->st_mode = (type << 16) \| rights;
1976
1977	#if DEBUG_VFS_STAT
1978	uint32_t cycle = (uint32_t)hal_get_cycles();
1979	if( DEBUG_VFS_STAT < cycle )
1980	printk("\n[%s] thread[%x,%x] set stat %x for inode %x in cluster %x / cycle %d\n"
1981	" %s / inum %d / size %d\n",
1982	__FUNCTION__, process->pid, this->trdid, st, inode_ptr, inode_cxy, cycle,
1983	vfs_inode_type_str( type ), inum, size );
1984	#endif
1985
1986	return 0;
1987
1988	} // end vfs_stat()
1989
1990	////////////////////////////////////
1991	error_t vfs_chdir( xptr_t root_xp,
1992	char * path )
1993	{
1994	error_t error;
1995	xptr_t inode_xp; // extended pointer on target inode
1996	cxy_t inode_cxy; // target inode cluster identifier
1997	vfs_inode_t * inode_ptr; // target inode local pointer
1998	vfs_inode_type_t inode_type; // target inode type
1999	xptr_t vfs_root_xp; // extended pointer on VFS root inode
2000	vfs_inode_t * vfs_root_ptr; // local_pointer on VFS root inode
2001	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
2002	xptr_t main_lock_xp; // extended pointer on lock protecting Inode Tree
2003	xptr_t ref_xp; // extended pointer on reference process
2004	process_t * ref_ptr; // local pointer on reference process
2005	cxy_t ref_cxy; // reference process cluster
2006	xptr_t cwd_lock_xp; // extended pointer on lock protecting CWD change
2007	xptr_t cwd_xp_xp; // extended pointer on cwd_xp in reference process
2008
2009	thread_t * this = CURRENT_THREAD;
2010	process_t * process = this->process;
2011
2012	#if DEBUG_VFS_CHDIR
2013	uint32_t cycle = (uint32_t)hal_get_cycles();
2014	if( DEBUG_VFS_CHDIR < cycle )
2015	printk("\n[%s] thread[%x,%x] enter for path <%s> / cycle %d\n",
2016	__FUNCTION__, process->pid, this->trdid, path, cycle );
2017	#endif
2018
2019	// build extended pointer on lock protecting Inode Tree (in VFS root inode)
2020	vfs_root_xp = process->vfs_root_xp;
2021	vfs_root_ptr = GET_PTR( vfs_root_xp );
2022	vfs_root_cxy = GET_CXY( vfs_root_xp );
2023	main_lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
2024
2025	// take lock protecting Inode Tree in read mode
2026	remote_rwlock_rd_acquire( main_lock_xp );
2027
2028	// get extended pointer on target inode
2029	error = vfs_lookup( root_xp,
2030	path,
2031	VFS_LOOKUP_DIR,
2032	&inode_xp,
2033	NULL );
2034
2035	// release lock protecting Inode Tree in read mode
2036	remote_rwlock_rd_release( main_lock_xp );
2037
2038	if( error )
2039	{
2040	printk("\n[ERROR] in %s : <%s> not found\n",
2041	__FUNCTION__, path );
2042	return -1;
2043	}
2044
2045	// get inode type from remote file
2046	inode_cxy = GET_CXY( inode_xp );
2047	inode_ptr = GET_PTR( inode_xp );
2048	inode_type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
2049
2050	if( inode_type != INODE_TYPE_DIR )
2051	{
2052	printk("\n[ERROR] in %s : <%s> is not a directory\n",
2053	__FUNCTION__, path );
2054	return -1;
2055	}
2056
2057	// build extended pointer on cwd_lock and cwd_xp
2058	ref_xp = process->ref_xp;
2059	ref_ptr = GET_PTR( ref_xp );
2060	ref_cxy = GET_CXY( ref_xp );
2061	cwd_lock_xp = XPTR( ref_cxy , &ref_ptr->cwd_lock );
2062	cwd_xp_xp = XPTR( ref_cxy , &ref_ptr->cwd_xp );
2063
2064	// take lock protecting CWD changes
2065	remote_busylock_acquire( cwd_lock_xp );
2066
2067	// update cwd_xp field in reference process descriptor
2068	hal_remote_s64( cwd_xp_xp , inode_xp );
2069
2070	// release lock protecting CWD changes
2071	remote_busylock_release( cwd_lock_xp );
2072
2073	#if DEBUG_VFS_CHDIR
2074	cycle = (uint32_t)hal_get_cycles();
2075	if( DEBUG_VFS_CHDIR < cycle )
2076	printk("\n[%s] thread[%x,%x] exit : inode (%x,%x) / &cwd_xp (%x,%x) / cycle %d\n",
2077	__FUNCTION__, process->pid, this->trdid, inode_cxy, inode_ptr,
2078	GET_CXY(cwd_xp_xp), GET_PTR(cwd_xp_xp), cycle );
2079	#endif
2080
2081	return 0;
2082
2083	} // end vfs_chdir()
2084
2085	///////////////////////////////////
2086	error_t vfs_chmod( xptr_t cwd_xp,
2087	char * path,
2088	uint32_t rights )
2089	{
2090	error_t error;
2091	xptr_t inode_xp; // extended pointer on target inode
2092	cxy_t inode_cxy; // inode cluster identifier
2093	vfs_inode_t * inode_ptr; // inode local pointer
2094
2095	// check lookup working mode
2096	assert( (rights == 0), "access rights non implemented yet" );
2097
2098	// get extended pointer on target inode
2099	error = vfs_lookup( cwd_xp,
2100	path,
2101	0,
2102	&inode_xp,
2103	NULL );
2104
2105	if( error ) return error;
2106
2107	// get inode cluster and local pointer
2108	inode_cxy = GET_CXY( inode_xp );
2109	inode_ptr = GET_PTR( inode_xp );
2110
2111	// get inode type from remote inode
2112	// inode_type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
2113
2114	// TODO finalize implementation
2115
2116	assert( false , "not implemented" );
2117
2118	// set inode rights in remote inode
2119	hal_remote_s32( XPTR( inode_cxy , &inode_ptr->rights ) , rights );
2120
2121	return 0;
2122	}
2123
2124	///////////////////////////////////
2125	error_t vfs_mkfifo( xptr_t cwd_xp,
2126	char * path,
2127	uint32_t rights )
2128	{
2129	assert( false , "not implemented %l %x %x", cwd_xp, path, rights );
2130	return 0;
2131	}
2132
2133
2134
2135	//////////////////////////////////////////////////////////////////////////////////////////
2136	// Distributed Inode Tree access related functions
2137	//////////////////////////////////////////////////////////////////////////////////////////
2138
2139	//////////////////////////////////////////////////////////////////////////
2140	// This static function is called by the vfs_display() function.
2141	// that is supposed to take the TXT0 lock.
2142	//////////////////////////////////////////////////////////////////////////
2143	static void vfs_recursive_display( xptr_t inode_xp,
2144	xptr_t name_xp,
2145	uint32_t indent )
2146	{
2147	cxy_t inode_cxy;
2148	vfs_inode_t * inode_ptr;
2149	vfs_inode_type_t inode_type;
2150	uint32_t inode_size;
2151	uint32_t inode_attr;
2152	uint32_t inode_dirty;
2153	void * inode_extd;
2154
2155	xptr_t children_xp; // extended pointer on children xhtab
2156
2157	xptr_t child_dentry_xp;
2158	cxy_t child_dentry_cxy;
2159	vfs_dentry_t * child_dentry_ptr;
2160	xptr_t child_inode_xp;
2161	xptr_t child_dentry_name_xp;
2162	mapper_t * mapper_ptr;
2163
2164	char name[CONFIG_VFS_MAX_NAME_LENGTH];
2165
2166	char * indent_str[] = { "", // level 0
2167	" ", // level 1
2168	" ", // level 2
2169	" ", // level 3
2170	" ", // level 4
2171	" ", // level 5
2172	" ", // level 6
2173	" ", // level 7
2174	" ", // level 8
2175	" ", // level 9
2176	" ", // level 10
2177	" ", // level 11
2178	" ", // level 12
2179	" ", // level 13
2180	" ", // level 14
2181	" " }; // level 15
2182
2183	assert( (inode_xp != XPTR_NULL) , "inode_xp cannot be NULL" );
2184	assert( (name_xp != XPTR_NULL) , "name_xp cannot be NULL" );
2185	assert( (indent < 16) , "depth cannot be larger than 15" );
2186
2187	// get current inode cluster and local pointer
2188	inode_cxy = GET_CXY( inode_xp );
2189	inode_ptr = GET_PTR( inode_xp );
2190
2191	// get inode type, size, attr, mapper, and inum
2192	inode_type = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->type ) );
2193	inode_size = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->size ) );
2194	inode_attr = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->attr ) );
2195	inode_extd = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->extend ) );
2196	mapper_ptr = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
2197
2198	// make a local copy of node name
2199	hal_remote_strcpy( XPTR( local_cxy , name ) , name_xp );
2200
2201	// compute dirty
2202	inode_dirty = ((inode_attr & INODE_ATTR_DIRTY) != 0);
2203
2204	// display inode
2205	nolock_printk("%s<%s> : %s / extd %x / %d bytes / dirty %d / cxy %x / inode %x / mapper %x\n",
2206	indent_str[indent], name, vfs_inode_type_str( inode_type ), (uint32_t)inode_extd,
2207	inode_size, inode_dirty, inode_cxy, inode_ptr, mapper_ptr );
2208
2209	// scan directory entries when current inode is a directory
2210	// don't scan the the "." and ".." directories to break loops
2211	if( (inode_type == INODE_TYPE_DIR) &&
2212	(strcmp( name , "." ) != 0) &&
2213	(strcmp( name , ".." ) != 0) )
2214	{
2215	// get extended pointer on directory entries xhtab
2216	children_xp = XPTR( inode_cxy , &inode_ptr->children );
2217
2218	// get xhtab lock
2219	xhtab_lock( children_xp );
2220
2221	// get first dentry from xhtab
2222	child_dentry_xp = xhtab_get_first( children_xp );
2223
2224	while( child_dentry_xp != XPTR_NULL )
2225	{
2226	// get dentry cluster and local pointer
2227	child_dentry_cxy = GET_CXY( child_dentry_xp );
2228	child_dentry_ptr = GET_PTR( child_dentry_xp );
2229
2230	// get extended pointer on child inode
2231	child_inode_xp = hal_remote_l64( XPTR( child_dentry_cxy,
2232	&child_dentry_ptr->child_xp ) );
2233
2234	// get extended pointer on dentry name
2235	child_dentry_name_xp = XPTR( child_dentry_cxy , &child_dentry_ptr->name );
2236
2237	// recursive call on inode display
2238	vfs_recursive_display( child_inode_xp,
2239	child_dentry_name_xp,
2240	indent+1 );
2241
2242	// get next dentry
2243	child_dentry_xp = xhtab_get_next( children_xp );
2244	}
2245
2246	// release xhtab lock
2247	xhtab_unlock( children_xp );
2248	}
2249	} // end vfs_recursive_display()
2250
2251	///////////////////////////////////
2252	void vfs_display( xptr_t inode_xp )
2253	{
2254	xptr_t name_xp;
2255	xptr_t dentry_xp;
2256	cxy_t dentry_cxy;
2257	vfs_dentry_t * dentry_ptr;
2258	xptr_t parents_root_xp; // root of parent dentries xlist
2259
2260	// get target inode cluster and local pointer
2261	cxy_t inode_cxy = GET_CXY( inode_xp );
2262	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
2263
2264	// build extended pointer on parents dentries root
2265	parents_root_xp = XPTR( inode_cxy , &inode_ptr->parents );
2266
2267	// check VFS root
2268	if( xlist_is_empty( parents_root_xp ) ) // inode is the VFS root
2269	{
2270	// build extended pointer on root name
2271	name_xp = XPTR( local_cxy , "/" );
2272	}
2273	else
2274	{
2275	// get first parent dentry cluster and pointers
2276	dentry_xp = XLIST_FIRST( parents_root_xp , vfs_dentry_t , parents );
2277	dentry_cxy = GET_CXY( dentry_xp );
2278	dentry_ptr = GET_PTR( dentry_xp );
2279
2280	// get extended pointer on dentry name
2281	name_xp = XPTR( dentry_cxy , &dentry_ptr->name );
2282	}
2283
2284	// get pointers on TXT0 chdev
2285	xptr_t txt0_xp = chdev_dir.txt_tx[0];
2286	cxy_t txt0_cxy = GET_CXY( txt0_xp );
2287	chdev_t * txt0_ptr = GET_PTR( txt0_xp );
2288
2289	// get extended pointer on remote TXT0 chdev lock
2290	xptr_t lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
2291
2292	// get TXT0 lock in busy waiting mode
2293	remote_busylock_acquire( lock_xp );
2294
2295	// print header
2296	nolock_printk("\n***** file system state\n\n");
2297
2298	// call recursive function
2299	vfs_recursive_display( inode_xp , name_xp , 0 );
2300
2301	// release lock
2302	remote_busylock_release( lock_xp );
2303
2304	} // end vfs_display()
2305
2306	/*
2307	//////////////////////////////////////////////////////////////////////////////////////////
2308	// This static function is used by the vfs_lookup() function.
2309	// It takes an extended pointer on a remote inode (parent directory inode),
2310	// and check access_rights violation for the calling thread.
2311	// It can be used by any thread running in any cluster.
2312	//////////////////////////////////////////////////////////////////////////////////////////
2313	// @ inode_xp : extended pointer on inode.
2314	// @ client_uid : client thread user ID
2315	// @ client_gid : client thread group ID
2316	// @ return true if access rights are violated.
2317	//////////////////////////////////////////////////////////////////////////////////////////
2318	static bool_t vfs_access_denied( xptr_t inode_xp,
2319	uint32_t client_uid,
2320	uint32_t client_gid )
2321	{
2322	// get found inode cluster and local pointer
2323	cxy_t inode_cxy = GET_CXY( inode_xp );
2324	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
2325
2326	// get inode access mode, UID, and GID
2327	// TODO uint32_t mode = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->mode ) );
2328	uid_t uid = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->uid ) );
2329	gid_t gid = hal_remote_l32( XPTR( inode_cxy , &inode_ptr->gid ) );
2330
2331	// TODO : me must use mode
2332	if( (uid == client_uid) \|\| (gid == client_gid) ) return false;
2333	else return true;
2334	}
2335	*/
2336
2337	//////////////////////////////////////////////////////////////////////////////////////////
2338	// This static function is used by the vfs_lookup() function.
2339	// It takes an extended pointer on a remote parent directory inode, a directory
2340	// entry name, and and scan the XHTAB associated to the parent inode to find the
2341	// searched dentry. It does NOT modify the inode tree in case of miss.
2342	// It can be used by any thread running in any cluster.
2343	//////////////////////////////////////////////////////////////////////////////////////////
2344	// @ parent_xp : extended pointer on parent inode in remote cluster.
2345	// @ name : dentry name
2346	// @ child_xp : [out] buffer for extended pointer on child inode.
2347	// @ return true if success / return false if not found.
2348	//////////////////////////////////////////////////////////////////////////////////////////
2349	static bool_t vfs_get_child( xptr_t parent_xp,
2350	char * name,
2351	xptr_t * child_xp )
2352	{
2353	xptr_t xhtab_xp; // extended pointer on hash table for children dentries
2354	xptr_t dentry_xp; // extended pointer on children dentry
2355	cxy_t dentry_cxy;
2356	vfs_dentry_t * dentry_ptr;
2357
2358	// get parent inode cluster and local pointer
2359	cxy_t parent_cxy = GET_CXY( parent_xp );
2360	vfs_inode_t * parent_ptr = GET_PTR( parent_xp );
2361
2362	// get extended pointer on hash table of children directory entries
2363	xhtab_xp = XPTR( parent_cxy , &parent_ptr->children );
2364
2365	// get pointers on matching dentry
2366	dentry_xp = xhtab_lookup( xhtab_xp , name );
2367	dentry_cxy = GET_CXY( dentry_xp );
2368	dentry_ptr = GET_PTR( dentry_xp );
2369
2370	if( dentry_xp == XPTR_NULL )
2371	{
2372	return false;
2373	}
2374	else
2375	{
2376	*child_xp = (xptr_t)hal_remote_l64( XPTR( dentry_cxy , &dentry_ptr->child_xp ) );
2377	return true;
2378	}
2379
2380	} // end vfs_get_child()
2381
2382	//////////////////////////////////////////////////////////////////////////////////////////
2383	// This static function is used by the vfs_lookup() function.
2384	// It takes the <current> pointer on a buffer containing a complete pathname, and return
2385	// in the <name> buffer, allocated by the caller, a single name in the path.
2386	// It return also in the <next> pointer the next character to analyse in the path.
2387	// Finally it returns a <last> boolean, that is true when the returned <name> is the
2388	// last name in the path. The names are supposed to be separated by one or several '/'
2389	// characters, that are not written in the <name> buffer.
2390	//
2391	// WARNING: the leading characters '/' in the path are skiped before analysis.
2392	// The path "/" identifies the VFS root, and is therefore anaysed as an empty
2393	// string. This empty string is dignaled by the (-1) return value.
2394	//////////////////////////////////////////////////////////////////////////////////////////
2395	// @ current : pointer on first character to analyse in buffer containing the path.
2396	// @ name : [out] pointer on buffer allocated by the caller for the returned name.
2397	// @ next : [out] pointer on next character to analyse in buffer containing the path.
2398	// @ last : [out] true if the returned name is the last (NUL character found).
2399	// @ return 0 if success / return -1 if string empty (first chracter is NUL).
2400	//////////////////////////////////////////////////////////////////////////////////////////
2401	static error_t vfs_get_name_from_path( char * current,
2402	char * name,
2403	char ** next,
2404	bool_t * last )
2405	{
2406	char * ptr = current;
2407
2408	// skip leading '/' characters
2409	while( *ptr == '/' ) ptr++;
2410
2411	// signal empty string
2412	if( *ptr == 0 )
2413	{
2414	*last = true;
2415	return -1;
2416	}
2417
2418	// copy all characters in name until NUL or '/'
2419	while( (ptr != 0) && (ptr !='/') ) (name++) = (ptr++);
2420
2421	// set NUL terminating character in name buffer
2422	*(name++) = 0;
2423
2424	// return last an next
2425	if( *ptr == 0 ) // last found character is NUL => last name in path
2426	{
2427	*last = true;
2428	}
2429	else // last found character is '/' => skip it
2430	{
2431	*last = false;
2432	*next = ptr + 1;
2433	}
2434
2435	return 0;
2436
2437	} // end vfs_get name_from_path()
2438
2439	///////////////////////////////////////////////
2440	error_t vfs_lookup( xptr_t root_xp,
2441	char * pathname,
2442	uint32_t lookup_mode,
2443	xptr_t * inode_xp,
2444	char * last_name )
2445	{
2446	char name[CONFIG_VFS_MAX_NAME_LENGTH]; // one name in path
2447
2448	xptr_t parent_xp; // extended pointer on parent inode
2449	cxy_t parent_cxy; // cluster for parent inode
2450	vfs_inode_t * parent_ptr; // local pointer on parent inode
2451	xptr_t dentry_xp; // extended pointer on dentry
2452	xptr_t child_xp; // extended pointer on child inode
2453	cxy_t child_cxy; // cluster for child inode
2454	vfs_inode_t * child_ptr; // local pointer on child inode
2455	vfs_fs_type_t fs_type; // File system type
2456	vfs_ctx_t * ctx_ptr; // local pointer on FS context
2457	char * current; // current pointer on path
2458	char * next; // next value for current pointer
2459	bool_t last; // true when the name is the last in path
2460	bool_t found; // true when a child has been found
2461	bool_t create; // searched inode must be created if not found
2462	bool_t excl; // searched inode must not exist
2463	bool_t parent; // searched inode is the parent
2464	thread_t * this; // pointer on calling thread descriptor
2465	process_t * process; // pointer on calling process descriptor
2466	error_t error;
2467
2468	this = CURRENT_THREAD;
2469	process = this->process;
2470
2471	// check pathname / root_xp consistency
2472	assert( ((pathname[0] != '/') \|\| (root_xp == process->vfs_root_xp)),
2473	"root inode must be VFS root for path <%s>", pathname );
2474
2475	#if DEBUG_VFS_LOOKUP
2476	uint32_t cycle = (uint32_t)hal_get_cycles();
2477	char root_name[CONFIG_VFS_MAX_NAME_LENGTH];
2478	vfs_inode_get_name( root_xp , root_name );
2479	if( DEBUG_VFS_LOOKUP < cycle )
2480	printk("\n[%s] thread[%x,%x] enter / root <%s> / path <%s> / mode %x / cycle %d\n",
2481	__FUNCTION__, process->pid, this->trdid, root_name, pathname, lookup_mode, cycle );
2482	#endif
2483
2484	// compute lookup flags
2485	create = (lookup_mode & VFS_LOOKUP_CREATE) == VFS_LOOKUP_CREATE;
2486	excl = (lookup_mode & VFS_LOOKUP_EXCL) == VFS_LOOKUP_EXCL;
2487	parent = (lookup_mode & VFS_LOOKUP_PARENT) == VFS_LOOKUP_PARENT;
2488
2489	// initialise loop variables
2490	parent_xp = root_xp;
2491	current = pathname;
2492	next = NULL;
2493	last = false;
2494	child_xp = XPTR_NULL;
2495
2496	// loop on nodes in pathname
2497	// load from device if one node in path not found in Inode Tree
2498	// exit loop when last name found (i.e. last == true)
2499	while( 1 )
2500	{
2501	// get parent inode cluster and local pointer
2502	parent_cxy = GET_CXY( parent_xp );
2503	parent_ptr = GET_PTR( parent_xp );
2504
2505	// get one "name" from path, and "last" flag
2506	error = vfs_get_name_from_path( current , name , &next , &last );
2507
2508	// handle VFS root case
2509	if ( error )
2510	{
2511
2512	#if DEBUG_VFS_LOOKUP
2513	cycle = (uint32_t)hal_get_cycles();
2514	if( DEBUG_VFS_LOOKUP < cycle )
2515	printk("\n[%s] thread[%x,%x] exit / parent inode(%x,%x) / <%s> / cycle %d\n",
2516	__FUNCTION__ , process->pid, this->trdid, parent_cxy, parent_ptr, pathname, cycle );
2517	#endif
2518	*inode_xp = process->vfs_root_xp;
2519	break;
2520	}
2521
2522	#if (DEBUG_VFS_LOOKUP & 1)
2523	if( DEBUG_VFS_LOOKUP < cycle )
2524	printk("\n[%s] thread[%x,%x] search <%s> in <%s> / last = %d\n",
2525	__FUNCTION__, process->pid, this->trdid, name, pathname, last );
2526	#endif
2527
2528	// search the child dentry matching name in parent inode
2529	found = vfs_get_child( parent_xp,
2530	name,
2531	&child_xp );
2532
2533	// get child inode local pointer and cluster
2534	child_ptr = GET_PTR( child_xp );
2535	child_cxy = GET_CXY( child_xp );
2536
2537	if( found == false ) // not found in Inode Tree
2538	{
2539	// when a inode is not found in the Inode Tree:
2540	// - if (last and parent) the Inode Tree is not modified
2541	// - else we speculatively introduce a new (dentry/inode) in inode tree,
2542	// and scan the parent directory mapper to initialise it.
2543	// . if it is not found in the parent mapper:
2544	// - if(last and create), a brand new file or directory is created
2545	// - else, an error is reported
2546	// . if it is found in parent mapper:
2547	// - if( last and excl ), an error is reported
2548	// - else the new child (inode & dentry) is initialised in Inode Tree
2549	// - if the child is a directory, the child mapper is loaded from device
2550
2551	if( last && parent ) // does nothing
2552	{
2553
2554	#if (DEBUG_VFS_LOOKUP & 1)
2555	if( DEBUG_VFS_LOOKUP < cycle )
2556	printk("\n[%s] thread[%x,%x] child not found but only parent requested in <%s>\n",
2557	__FUNCTION__, process->pid, this->trdid, pathname );
2558	#endif
2559	}
2560	else // try to get it from parent mapper
2561	{
2562
2563	#if (DEBUG_VFS_LOOKUP & 1)
2564	if( DEBUG_VFS_LOOKUP < cycle )
2565	printk("\n[%s] thread[%x,%x] miss <%s> inode in Inode Tree => build from parent mapper\n",
2566	__FUNCTION__, process->pid, this->trdid, name );
2567	#endif
2568	// get parent inode FS type
2569	ctx_ptr = hal_remote_lpt( XPTR( parent_cxy,&parent_ptr->ctx ) );
2570	fs_type = hal_remote_l32( XPTR( parent_cxy , &ctx_ptr->type ) );
2571
2572	// select a cluster for new inode
2573	child_cxy = cluster_random_select();
2574
2575	// insert a new child dentry/inode couple in inode tree
2576	error = vfs_add_child_in_parent( child_cxy,
2577	fs_type,
2578	parent_xp,
2579	name,
2580	&dentry_xp,
2581	&child_xp );
2582	if( error )
2583	{
2584	printk("\n[ERROR] in %s : cannot create inode <%s> in path <%s>\n",
2585	__FUNCTION__ , name, pathname );
2586	return -1;
2587	}
2588
2589	// get child inode local pointer
2590	child_ptr = GET_PTR( child_xp );
2591
2592	#if (DEBUG_VFS_LOOKUP & 1)
2593	if( DEBUG_VFS_LOOKUP < cycle )
2594	printk("\n[%s] thread[%x,%x] created missing inode for <%s> in cluster %x\n",
2595	__FUNCTION__, process->pid, this->trdid, name, child_cxy );
2596	#endif
2597	// scan parent mapper to find the missing dentry, and complete
2598	// the initialisation of dentry and child inode descriptors
2599	if( parent_cxy == local_cxy )
2600	{
2601	error = vfs_fs_new_dentry( parent_ptr,
2602	name,
2603	child_xp );
2604	}
2605	else
2606	{
2607	rpc_vfs_fs_new_dentry_client( parent_cxy,
2608	parent_ptr,
2609	name,
2610	child_xp,
2611	&error );
2612	}
2613
2614	// when the missing dentry is not in the parent mapper,
2615	// a new dentry must be registered in parent directory mapper
2616	if ( error )
2617	{
2618	if ( last && create ) // add a brand new dentry in parent directory
2619	{
2620	error = vfs_new_dentry_init( parent_xp,
2621	dentry_xp,
2622	child_xp );
2623	if ( error )
2624	{
2625	printk("\n[ERROR] in %s : cannot init inode <%s> in path <%s>\n",
2626	__FUNCTION__, name, pathname );
2627	vfs_remove_child_from_parent( dentry_xp );
2628	return -1;
2629	}
2630
2631	#if (DEBUG_VFS_LOOKUP & 1)
2632	if( DEBUG_VFS_LOOKUP < cycle )
2633	printk("\n[%s] thread[%x,%x] child <%s> not found in parent mapper => created it\n",
2634	__FUNCTION__, process->pid, this->trdid, name );
2635	vfs_inode_display( child_xp );
2636	#endif
2637
2638
2639	}
2640	else // not last or not create => error
2641	{
2642	printk("\n[ERROR] in %s : <%s> node not found in parent for <%s>\n",
2643	__FUNCTION__ , name , pathname );
2644	vfs_remove_child_from_parent( dentry_xp );
2645	return -1;
2646	}
2647	}
2648	else // child has been found in parent mapper
2649	{
2650	// check the excl
2651	if( last && create && excl )
2652	{
2653	printk("\n[ERROR] in %s : node already exist <%s>\n",
2654	__FUNCTION__, name );
2655	return -1;
2656	}
2657
2658	#if (DEBUG_VFS_LOOKUP & 1)
2659	if( DEBUG_VFS_LOOKUP < cycle )
2660	printk("\n[%s] thread[%x,%x] initialised inode <%s> from parent mapper\n",
2661	__FUNCTION__, process->pid, this->trdid, name );
2662	#endif
2663	// load child mapper from device if child is a directory (prefetch)
2664	uint32_t type = hal_remote_l32( XPTR( child_cxy , &child_ptr->type ) );
2665	if( type == INODE_TYPE_DIR )
2666	{
2667	if( child_cxy == local_cxy )
2668	{
2669	error = vfs_inode_load_all_pages( child_ptr );
2670	}
2671	else
2672	{
2673	rpc_vfs_inode_load_all_pages_client( child_cxy,
2674	child_ptr,
2675	&error );
2676	}
2677	if ( error )
2678	{
2679	printk("\n[ERROR] in %s : cannot load <%s> from device\n",
2680	__FUNCTION__ , name );
2681	vfs_remove_child_from_parent( dentry_xp );
2682	return -1;
2683	}
2684
2685	#if (DEBUG_VFS_LOOKUP & 1)
2686	if( DEBUG_VFS_LOOKUP < cycle )
2687	printk("\n[%s] thread[%x,%x] loaded directory mapper for <%s> from IOC\n",
2688	__FUNCTION__ , process->pid, this->trdid, name );
2689	#endif
2690	}
2691	}
2692	}
2693	}
2694	else // child directly found in inode tree
2695	{
2696
2697	#if (DEBUG_VFS_LOOKUP & 1)
2698	if( DEBUG_VFS_LOOKUP < cycle )
2699	printk("\n[%s] thread[%x,%x] found <%s> in Inode Tree / inode (%x,%x)\n",
2700	__FUNCTION__, process->pid, this->trdid, name, child_cxy, child_ptr );
2701	#endif
2702	// check the excl flag
2703	if( last && create && excl )
2704	{
2705	printk("\n[ERROR] in %s : node <%s> already exist\n",
2706	__FUNCTION__, name );
2707	return -1;
2708	}
2709	}
2710
2711	// TODO check access rights here [AG]
2712	// error = vfs_access_denied( child_xp,
2713	// client_uid,
2714	// client_gid );
2715	// if( error )
2716	// {
2717	// printk("\n[ERROR] in %s : thread %x / permission denied for %s\n",
2718	// __FUNCTION__ , this , name );
2719	// return EACCES;
2720	// }
2721
2722	// take lock on child inode and release lock on parent
2723	// vfs_inode_lock( child_xp );
2724	// vfs_inode_unlock( parent_xp );
2725
2726	// exit when last
2727	if ( last ) // last inode in path => return relevant info
2728	{
2729	if ( parent ) // return parent inode and child name
2730	{
2731
2732	#if DEBUG_VFS_LOOKUP
2733	cycle = (uint32_t)hal_get_cycles();
2734	if( DEBUG_VFS_LOOKUP < cycle )
2735	printk("\n[%s] thread[%x,%x] exit / parent inode(%x,%x) / <%s> / cycle %d\n",
2736	__FUNCTION__ , process->pid, this->trdid, parent_cxy, parent_ptr, pathname, cycle );
2737	#endif
2738	*inode_xp = parent_xp;
2739	strcpy( last_name , name );
2740	break;
2741	}
2742	else // return child inode name
2743	{
2744
2745	#if DEBUG_VFS_LOOKUP
2746	cycle = (uint32_t)hal_get_cycles();
2747	if( DEBUG_VFS_LOOKUP < cycle )
2748	printk("\n[%s] thread[%x,%x] exit / child inode (%x,%x) / <%s> / cycle %d\n",
2749	__FUNCTION__ , process->pid, this->trdid, child_cxy, child_ptr, pathname, cycle );
2750	#endif
2751	*inode_xp = child_xp;
2752	break;
2753	}
2754	}
2755	else // not the last inode in path => update loop variables
2756	{
2757	parent_xp = child_xp;
2758	current = next;
2759	}
2760	}
2761
2762	return 0;
2763
2764	} // end vfs_lookup()
2765
2766	////////////////////////////////////////////////
2767	error_t vfs_new_dentry_init( xptr_t parent_xp,
2768	xptr_t dentry_xp,
2769	xptr_t child_xp )
2770	{
2771	error_t error;
2772	uint32_t cluster;
2773	uint32_t child_type;
2774	uint32_t child_size;
2775
2776	#if DEBUG_VFS_NEW_DENTRY_INIT
2777	char parent_name[CONFIG_VFS_MAX_NAME_LENGTH];
2778	char child_name[CONFIG_VFS_MAX_NAME_LENGTH];
2779	vfs_inode_get_name( parent_xp , parent_name );
2780	vfs_inode_get_name( child_xp , child_name );
2781	uint32_t cycle = (uint32_t)hal_get_cycles();
2782	thread_t * this = CURRENT_THREAD;
2783	if( DEBUG_VFS_NEW_DENTRY_INIT < cycle )
2784	printk("\n[%s] thread[%x,%x] enter / parent <%s> / child <%s> / cycle %d\n",
2785	__FUNCTION__ , this->process->pid, this->trdid, parent_name, child_name, cycle );
2786	#endif
2787
2788	// get parent inode cluster and local pointer
2789	cxy_t parent_cxy = GET_CXY( parent_xp );
2790	vfs_inode_t * parent_ptr = GET_PTR( parent_xp );
2791
2792	// get dentry local pointer
2793	vfs_dentry_t * dentry_ptr = GET_PTR( dentry_xp );
2794
2795	// get child inode cluster and local pointer
2796	cxy_t child_cxy = GET_CXY( child_xp );
2797	vfs_inode_t * child_ptr = GET_PTR( child_xp );
2798
2799	// 1. allocate one free cluster in file system to child inode,
2800	// and update the File Allocation Table in both the FAT mapper and IOC device.
2801	// It depends on the child inode FS type.
2802	vfs_ctx_t * ctx = hal_remote_lpt( XPTR( child_cxy , &child_ptr->ctx ) );
2803
2804	error = vfs_fs_cluster_alloc( ctx->type,
2805	&cluster );
2806	if ( error )
2807	{
2808	printk("\n[ERROR] in %s : cannot find a free VFS cluster\n",
2809	__FUNCTION__ );
2810	return -1;
2811	}
2812
2813	#if( DEBUG_VFS_NEW_DENTRY_INIT & 1)
2814	if( DEBUG_VFS_NEW_DENTRY_INIT < cycle )
2815	printk("\n[%s] thread[%x,%x] allocated FS cluster %x to <%s>\n",
2816	__FUNCTION__ , this->process->pid, this->trdid, cluster, child_name );
2817	#endif
2818
2819	// 2. update the child inode descriptor size and extend
2820	child_type = hal_remote_l32( XPTR( child_cxy , &child_ptr->type ) );
2821	child_size = (child_type == INODE_TYPE_DIR) ? 4096 : 0;
2822
2823	hal_remote_s32( XPTR( child_cxy , &child_ptr->size ) , child_size );
2824	hal_remote_spt( XPTR( child_cxy , &child_ptr->extend ) , (void*)(intptr_t)cluster );
2825
2826	// 3. update the parent inode mapper, and
2827	// update the dentry extension if required
2828	if( local_cxy == parent_cxy )
2829	{
2830	error = vfs_fs_add_dentry( parent_ptr,
2831	dentry_ptr );
2832	}
2833	else
2834	{
2835	rpc_vfs_fs_add_dentry_client( parent_cxy,
2836	parent_ptr,
2837	dentry_ptr,
2838	&error );
2839	}
2840	if ( error )
2841	{
2842	printk("\n[ERROR] in %s : cannot register child in parent directory\n",
2843	__FUNCTION__ );
2844	return -1;
2845	}
2846
2847	#if DEBUG_VFS_NEW_DENTRY_INIT
2848	cycle = (uint32_t)hal_get_cycles();
2849	if( DEBUG_VFS_NEW_DENTRY_INIT < cycle )
2850	printk("\n[%s] thread[%x,%x] exit / parent <%s> / child <%s> / cycle %d\n",
2851	__FUNCTION__ , this->process->pid, this->trdid, parent_name, child_name, cycle );
2852	#endif
2853
2854	return 0;
2855
2856	} // end vfs_new_dentry_init()
2857
2858	///////////////////////////////////////////////////
2859	error_t vfs_add_special_dentries( xptr_t child_xp,
2860	xptr_t parent_xp )
2861	{
2862	error_t error;
2863	vfs_inode_t * child_ptr; // local pointer on child inode directory
2864	cxy_t child_cxy; // child inode directory cluster identifier
2865	vfs_ctx_t * ctx_ptr; // local pointer on child inode FS context
2866	vfs_fs_type_t fs_type; // FS type of child inode
2867	xptr_t dentry_xp; // extended pointer on dentry (used for . and ..)
2868	vfs_dentry_t * dentry_ptr; // local pointer on dentry (used for . and ..)
2869
2870	// xptr_t parents_root_xp; // extended pointer on inode "parents" field
2871	// xptr_t parents_entry_xp; // extended pointer on dentry "parents" field
2872	xptr_t children_xhtab_xp; // extended pointer on inode "children" field
2873	xptr_t children_entry_xp; // extended pointer on dentry "children" field
2874
2875	#if DEBUG_VFS_ADD_SPECIAL
2876	uint32_t cycle = (uint32_t)hal_get_cycles();
2877	thread_t * this = CURRENT_THREAD;
2878	char child_name[CONFIG_VFS_MAX_NAME_LENGTH];
2879	char parent_name[CONFIG_VFS_MAX_NAME_LENGTH];
2880	vfs_inode_get_name( child_xp , child_name );
2881	vfs_inode_get_name( parent_xp , parent_name );
2882	if( DEBUG_VFS_ADD_SPECIAL < cycle )
2883	printk("\n[%s] thread[%x,%x] enter for child <%s> in parent <%s> / cycle %d\n",
2884	__FUNCTION__, this->process->pid, this->trdid, child_name, parent_name, cycle );
2885	#endif
2886
2887	// get new directory cluster and local pointer
2888	child_cxy = GET_CXY( child_xp );
2889	child_ptr = GET_PTR( child_xp );
2890
2891	// get child inode FS type
2892	ctx_ptr = hal_remote_lpt( XPTR( child_cxy , &child_ptr->ctx ) );
2893	fs_type = hal_remote_l32( XPTR( child_cxy , &ctx_ptr->type ) );
2894
2895	//////////////////////////// create <.> dentry //////////////////////
2896	if( child_cxy == local_cxy )
2897	{
2898	error = vfs_dentry_create( fs_type,
2899	".",
2900	&dentry_xp );
2901	}
2902	else
2903	{
2904	rpc_vfs_dentry_create_client( child_cxy,
2905	fs_type,
2906	".",
2907	&dentry_xp,
2908	&error );
2909	}
2910	if( error )
2911	{
2912	printk("\n[ERROR] in %s : cannot create dentry <.> in cluster %x\n",
2913	__FUNCTION__ , child_cxy );
2914	return -1;
2915	}
2916
2917	// get <.> dentry local pointer
2918	dentry_ptr = GET_PTR( dentry_xp );
2919
2920	#if(DEBUG_VFS_ADD_SPECIAL & 1)
2921	cycle = (uint32_t)hal_get_cycles();
2922	if( DEBUG_VFS_ADD_SPECIAL < cycle )
2923	printk("\n[%s] thread[%x,%x] created dentry <.> (%x,%x) / cycle %d\n",
2924	__FUNCTION__, this->process->pid, this->trdid, child_cxy, dentry_ptr, cycle );
2925	#endif
2926
2927	// register <.> dentry in child inode xhtab of children
2928	children_xhtab_xp = XPTR( child_cxy , &child_ptr->children );
2929	children_entry_xp = XPTR( child_cxy , &dentry_ptr->children );
2930	error = xhtab_insert( children_xhtab_xp , "." , children_entry_xp );
2931	if( error )
2932	{
2933	printk("\n[ERROR] in %s : cannot register dentry <.> in xhtab\n",
2934	__FUNCTION__ );
2935	return -1;
2936	}
2937
2938
2939	// don't register <.> dentry in child_inode xlist of parents
2940	// parents_root_xp = XPTR( child_cxy , &child_ptr->parents );
2941	// parents_entry_xp = XPTR( child_cxy , &dentry_ptr->parents );
2942	// xlist_add_first( parents_root_xp , parents_entry_xp );
2943	// hal_remote_atomic_add( XPTR( child_cxy , &child_ptr->links ) , 1 );
2944
2945	// update "parent" and "child_xp" fields in <.> dentry
2946	hal_remote_s64( XPTR( child_cxy , &dentry_ptr->child_xp ) , child_xp );
2947	hal_remote_spt( XPTR( child_cxy , &dentry_ptr->parent ) , child_ptr );
2948
2949	#if(DEBUG_VFS_ADD_SPECIAL & 1)
2950	cycle = (uint32_t)hal_get_cycles();
2951	if( DEBUG_VFS_ADD_SPECIAL < cycle )
2952	printk("\n[%s] thread[%x,%x] linked dentry <.> to parent and child inodes / cycle %d\n",
2953	__FUNCTION__, this->process->pid, this->trdid, cycle );
2954	#endif
2955
2956	// introduce <.> dentry into child directory mapper
2957	// only if the target directory is not the root VFS
2958	if( child_xp != parent_xp )
2959	{
2960	if( child_cxy == local_cxy )
2961	{
2962	error = vfs_fs_add_dentry( child_ptr,
2963	dentry_ptr );
2964	}
2965	else
2966	{
2967	rpc_vfs_fs_add_dentry_client( child_cxy,
2968	child_ptr,
2969	dentry_ptr,
2970	&error );
2971	}
2972	if( error )
2973	{
2974	printk("\n[ERROR] in %s : cannot introduce dentry <..> in mapper %x\n",
2975	__FUNCTION__ );
2976	return -1;
2977	}
2978
2979	#if(DEBUG_VFS_ADD_SPECIAL & 1)
2980	cycle = (uint32_t)hal_get_cycles();
2981	if( DEBUG_VFS_ADD_SPECIAL < cycle )
2982	printk("\n[%s] thread[%x,%x] registered dentry <.> in child mapper / cycle %d\n",
2983	__FUNCTION__, this->process->pid, this->trdid, cycle );
2984	#endif
2985
2986	}
2987
2988	///////////////////////////// create <..> dentry ///////////////////////
2989	if( child_cxy == local_cxy )
2990	{
2991	error = vfs_dentry_create( fs_type,
2992	"..",
2993	&dentry_xp );
2994	}
2995	else
2996	{
2997	rpc_vfs_dentry_create_client( child_cxy,
2998	fs_type,
2999	"..",
3000	&dentry_xp,
3001	&error );
3002	}
3003	if( error )
3004	{
3005	printk("\n[ERROR] in %s : cannot create dentry <..> in cluster %x\n",
3006	__FUNCTION__ , child_cxy );
3007	return -1;
3008	}
3009
3010	// get <..> dentry local pointer
3011	dentry_ptr = GET_PTR( dentry_xp );
3012
3013	#if(DEBUG_VFS_ADD_SPECIAL & 1)
3014	cycle = (uint32_t)hal_get_cycles();
3015	if( DEBUG_VFS_ADD_SPECIAL < cycle )
3016	printk("\n[%s] thread[%x,%x] created dentry <..> (%x,%x) / cycle %d\n",
3017	__FUNCTION__, this->process->pid, this->trdid, child_cxy, dentry_ptr, cycle );
3018	#endif
3019
3020	// register <..> dentry in child_inode xhtab of children
3021	children_xhtab_xp = XPTR( child_cxy , &child_ptr->children );
3022	children_entry_xp = XPTR( child_cxy , &dentry_ptr->children );
3023	error = xhtab_insert( children_xhtab_xp , ".." , children_entry_xp );
3024	if( error )
3025	{
3026	printk("\n[ERROR] in %s : cannot register dentry <..> in xhtab\n",
3027	__FUNCTION__ );
3028	return -1;
3029	}
3030
3031	// don't register <..> dentry in parent_inode xlist of parents
3032
3033	// update "parent" and "child_xp" fields in <..> dentry
3034	hal_remote_s64( XPTR( child_cxy , &dentry_ptr->child_xp ) , parent_xp );
3035	hal_remote_spt( XPTR( child_cxy , &dentry_ptr->parent ) , child_ptr );
3036
3037	#if(DEBUG_VFS_ADD_SPECIAL & 1)
3038	cycle = (uint32_t)hal_get_cycles();
3039	if( DEBUG_VFS_ADD_SPECIAL < cycle )
3040	printk("\n[%s] thread[%x,%x] linked dentry <..> to parent and child inodes / cycle %d\n",
3041	__FUNCTION__, this->process->pid, this->trdid, cycle );
3042	#endif
3043
3044	// introduce <..> dentry into child directory mapper
3045	// only if the target directory is not the root VFS
3046	if( child_xp != parent_xp )
3047	{
3048	if( child_cxy == local_cxy )
3049	{
3050	error = vfs_fs_add_dentry( child_ptr,
3051	dentry_ptr );
3052	}
3053	else
3054	{
3055	rpc_vfs_fs_add_dentry_client( child_cxy,
3056	child_ptr,
3057	dentry_ptr,
3058	&error );
3059	}
3060	if( error )
3061	{
3062	printk("\n[ERROR] in %s : cannot introduce dentry <..> in mapper %x\n",
3063	__FUNCTION__ );
3064	return -1;
3065	}
3066
3067	#if(DEBUG_VFS_ADD_SPECIAL & 1)
3068	cycle = (uint32_t)hal_get_cycles();
3069	if( DEBUG_VFS_ADD_SPECIAL < cycle )
3070	printk("\n[%s] thread[%x,%x] registered dentry <..> in child mapper / cycle %d\n",
3071	__FUNCTION__, this->process->pid, this->trdid, cycle );
3072	#endif
3073
3074	}
3075
3076	#if DEBUG_VFS_ADD_SPECIAL
3077	cycle = (uint32_t)hal_get_cycles();
3078	if( DEBUG_VFS_ADD_SPECIAL < cycle )
3079	printk("\n[%s] thread[%x,%x] exit for child <%s> in parent <%s> / cycle %d\n",
3080	__FUNCTION__, this->process->pid, this->trdid, child_name, parent_name, cycle );
3081	#endif
3082
3083	return 0;
3084
3085	} // end vfs_add_special_dentries()
3086
3087	//////////////////////////////////////////
3088	error_t vfs_get_path( xptr_t inode_xp,
3089	char * buffer,
3090	char ** first,
3091	uint32_t max_size )
3092	{
3093	xptr_t dentry_xp; // extended pointer on current dentry
3094	vfs_dentry_t * dentry_ptr; // local pointer on current dentry
3095	cxy_t dentry_cxy; // current dentry cluster identifier
3096	xptr_t name_xp; // extended pointer on current dentry name
3097	uint32_t length; // length of current dentry name
3098	int32_t index; // slot index in buffer
3099	xptr_t current_xp; // extended pointer on current inode
3100	vfs_inode_t * current_ptr; // local pointer on current inode
3101	cxy_t current_cxy; // current inode cluster identifier
3102	xptr_t vfs_root_xp; // extended pointer on VFS root inode
3103	vfs_inode_t * vfs_root_ptr; // local pointer on VFS root inode
3104	cxy_t vfs_root_cxy; // VFS root inode cluster identifier
3105	xptr_t lock_xp; // extended pointer on Inode Tree lock
3106	xptr_t parents_root_xp; // extended pointer on current inode parents root
3107	bool_t found; // condition to exit the while loop
3108
3109	thread_t * this = CURRENT_THREAD;
3110	process_t * process = this->process;
3111
3112	#if DEBUG_VFS_GET_PATH
3113	uint32_t cycle = (uint32_t)hal_get_cycles();
3114	if( DEBUG_VFS_GET_PATH < cycle )
3115	printk("\n[%s] thread[%x,%x] enter : inode (%x,%x) / cycle %d\n",
3116	__FUNCTION__ , process->pid, this->trdid,
3117	GET_CXY( inode_xp ), GET_PTR( inode_xp ), cycle );
3118	#endif
3119
3120	// set the NUL character in buffer / initialise buffer index
3121	buffer[max_size - 1] = 0;
3122	index = (int32_t)(max_size - 1);
3123
3124	// initialize current inode
3125	current_xp = inode_xp;
3126
3127	// build extended pointer on lock protecting Inode Tree
3128	vfs_root_xp = process->vfs_root_xp;
3129	vfs_root_ptr = GET_PTR( vfs_root_xp );
3130	vfs_root_cxy = GET_CXY( vfs_root_xp );
3131	lock_xp = XPTR( vfs_root_cxy , &vfs_root_ptr->main_lock );
3132
3133	// take lock protecting Inode Tree in read mode
3134	remote_rwlock_rd_acquire( lock_xp );
3135
3136	// traverse Inode Tree from target inode to VFS root
3137	// selecting always the first parent dentry
3138	// the buffer is written in "reverse order" (from target inode to root)
3139	// exit the while loop when the VFS root has been found
3140	do
3141	{
3142	// get current inode cluster and local pointer
3143	current_cxy = GET_CXY( current_xp );
3144	current_ptr = GET_PTR( current_xp );
3145
3146	// build extended pointer on parents dentries root
3147	parents_root_xp = XPTR( current_cxy , &current_ptr->parents );
3148
3149	// compute exit condition <=> current inode is VFS root
3150	found = xlist_is_empty( parents_root_xp );
3151
3152	if( found ) // parent is the VFS root
3153	{
3154	if( index == (int32_t)(max_size - 1) )
3155	{
3156	// update index
3157	index--;
3158
3159	// set separator
3160	buffer[index] = '/';
3161
3162	// check buffer overflow
3163	assert( (index >= 0) , "kernel buffer too small" );
3164
3165	}
3166	}
3167	else // not the VFS root
3168	{
3169	// get first parent dentry cluster and pointers
3170	dentry_xp = XLIST_FIRST( parents_root_xp , vfs_dentry_t , parents );
3171	dentry_cxy = GET_CXY( dentry_xp );
3172	dentry_ptr = GET_PTR( dentry_xp );
3173
3174	// get extended pointer on dentry name and name length
3175	name_xp = XPTR( dentry_cxy , dentry_ptr->name );
3176	length = hal_remote_l32( XPTR( dentry_cxy , &dentry_ptr->length ) );
3177
3178	#if (DEBUG_VFS_GET_PATH & 1)
3179	char debug_name[CONFIG_VFS_MAX_NAME_LENGTH];
3180	hal_remote_strcpy( XPTR( local_cxy , debug_name ) , name_xp );
3181	if( DEBUG_VFS_GET_PATH < cycle )
3182	printk("\n[%s] thread(%x,%s) get current dentry <%s> in cluster %x\n",
3183	__FUNCTION__ , process->pid, this->trdid, debug_name, current_cxy );
3184	#endif
3185	// update index
3186	index -= (length + 1);
3187
3188	// check buffer overflow
3189	assert( (index >= 0) , "kernel buffer too small" );
3190
3191	// update pathname
3192	hal_remote_memcpy( XPTR( local_cxy , &buffer[index + 1] ) ,
3193	name_xp , length );
3194
3195	// set separator
3196	buffer[index] = '/';
3197
3198	// get extended pointer on parent inode
3199	current_xp = XPTR( dentry_cxy ,
3200	hal_remote_lpt( XPTR( dentry_cxy , &dentry_ptr->parent ) ) );
3201	}
3202	}
3203	while( found == false );
3204
3205	// release lock protecting Inode Tree in read mode
3206	remote_rwlock_rd_release( lock_xp );
3207
3208	#if DEBUG_VFS_GET_PATH
3209	cycle = (uint32_t)hal_get_cycles();
3210	if( DEBUG_VFS_GET_PATH < cycle )
3211	printk("\n[%s] thread[%x,%x] exit : path <%s> / cycle %d\n",
3212	__FUNCTION__ , process->pid, this->trdid, &buffer[index], cycle );
3213	#endif
3214
3215	// return pointer on first character in buffer
3216	*first = &buffer[index];
3217	return 0;
3218
3219	} // end vfs_get_path()
3220
3221
3222	////////////////////////////////////////////////////////////////////
3223	error_t vfs_add_child_in_parent( cxy_t child_cxy,
3224	vfs_fs_type_t fs_type,
3225	xptr_t parent_inode_xp,
3226	char * name,
3227	xptr_t * child_dentry_xp,
3228	xptr_t * child_inode_xp )
3229	{
3230	error_t error;
3231	cxy_t parent_cxy; // parent inode cluster identifier
3232	vfs_inode_t * parent_inode_ptr; // parent inode local pointer
3233	xptr_t new_dentry_xp; // extended pointer on created dentry
3234	vfs_dentry_t * new_dentry_ptr; // created dentry local pointer
3235	xptr_t new_inode_xp; // extended pointer on created child inode
3236	vfs_inode_t * new_inode_ptr; // local pointer on created child inode
3237
3238	xptr_t parents_root_xp; // extended pointer on child inode "parents" field
3239	xptr_t parents_entry_xp; // extended pointer on child dentry "parents" field
3240	xptr_t children_xhtab_xp; // extended pointer on parent inode "children" field
3241	xptr_t children_entry_xp; // extended pointer on child dentry "children" field
3242
3243	// get parent inode cluster and pointer
3244	parent_cxy = GET_CXY( parent_inode_xp );
3245	parent_inode_ptr = GET_PTR( parent_inode_xp );
3246
3247	#if DEBUG_VFS_ADD_CHILD
3248	char parent_name[CONFIG_VFS_MAX_NAME_LENGTH];
3249	vfs_inode_get_name( parent_inode_xp , parent_name );
3250	uint32_t cycle = (uint32_t)hal_get_cycles();
3251	thread_t * this = CURRENT_THREAD;
3252	if( DEBUG_VFS_ADD_CHILD < cycle )
3253	printk("\n[%s] thread[%x,%x] enter / child <%s> / parent <%s> / cycle %d\n",
3254	__FUNCTION__, this->process->pid, this->trdid, name,
3255	parent_name, (uint32_t)hal_get_cycles() );
3256	#endif
3257
3258	// 1. create dentry in parent cluster
3259	if( parent_cxy == local_cxy ) // parent cluster is local
3260	{
3261	error = vfs_dentry_create( fs_type,
3262	name,
3263	&new_dentry_xp );
3264	}
3265	else // parent cluster is remote
3266	{
3267	rpc_vfs_dentry_create_client( parent_cxy,
3268	fs_type,
3269	name,
3270	&new_dentry_xp,
3271	&error );
3272	}
3273
3274	if( error )
3275	{
3276	printk("\n[ERROR] in %s : cannot create dentry <%s> in cluster %x\n",
3277	__FUNCTION__ , name , parent_cxy );
3278	return -1;
3279	}
3280
3281	// get dentry local pointer
3282	new_dentry_ptr = GET_PTR( new_dentry_xp );
3283
3284	#if(DEBUG_VFS_ADD_CHILD & 1)
3285	if( DEBUG_VFS_ADD_CHILD < cycle )
3286	printk("\n[%s] thread[%x,%x] / dentry <%s> created (%x,%x)\n",
3287	__FUNCTION__, this->process->pid, this->trdid, name, parent_cxy, new_dentry_ptr );
3288	#endif
3289
3290	// 2. create child inode in child cluster
3291	// TODO : define attr / mode / uid / gid
3292	uint32_t attr = 0;
3293	uint32_t mode = 0;
3294	uint32_t uid = 0;
3295	uint32_t gid = 0;
3296
3297	if( child_cxy == local_cxy ) // child cluster is local
3298	{
3299	error = vfs_inode_create( fs_type,
3300	attr,
3301	mode,
3302	uid,
3303	gid,
3304	&new_inode_xp );
3305	}
3306	else // child cluster is remote
3307	{
3308	rpc_vfs_inode_create_client( child_cxy,
3309	fs_type,
3310	attr,
3311	mode,
3312	uid,
3313	gid,
3314	&new_inode_xp,
3315	&error );
3316	}
3317
3318	if( error )
3319	{
3320	printk("\n[ERROR] in %s : cannot create inode in cluster %x\n",
3321	__FUNCTION__ , child_cxy );
3322
3323	if( parent_cxy == local_cxy ) vfs_dentry_destroy( new_dentry_ptr );
3324	else rpc_vfs_dentry_destroy_client( parent_cxy , new_dentry_ptr );
3325	return -1;
3326	}
3327
3328	// get new inode local pointer
3329	new_inode_ptr = GET_PTR( new_inode_xp );
3330
3331	#if(DEBUG_VFS_ADD_CHILD & 1)
3332	if( DEBUG_VFS_ADD_CHILD < cycle )
3333	printk("\n[%s] thread[%x,%x] / inode <%s> created (%x,%x)\n",
3334	__FUNCTION__ , this->process->pid, this->trdid, name , child_cxy, new_inode_ptr );
3335	#endif
3336
3337
3338	// 3. register new_dentry in new_inode xlist of parents
3339	parents_root_xp = XPTR( child_cxy , &new_inode_ptr->parents );
3340	parents_entry_xp = XPTR( parent_cxy, &new_dentry_ptr->parents );
3341	xlist_add_first( parents_root_xp , parents_entry_xp );
3342	hal_remote_atomic_add( XPTR( child_cxy , &new_inode_ptr->links ) , 1 );
3343
3344	#if(DEBUG_VFS_ADD_CHILD & 1)
3345	if( DEBUG_VFS_ADD_CHILD < cycle )
3346	printk("\n[%s] thread[%x,%x] link dentry(%x,%x) to child inode(%x,%x)\n",
3347	__FUNCTION__, this->process->pid, this->trdid,
3348	parent_cxy, new_dentry_ptr, child_cxy, new_inode_ptr );
3349	#endif
3350
3351	// 4. register new_dentry in parent_inode xhtab of children
3352	children_xhtab_xp = XPTR( parent_cxy , &parent_inode_ptr->children );
3353	children_entry_xp = XPTR( parent_cxy , &new_dentry_ptr->children );
3354	xhtab_insert( children_xhtab_xp , name , children_entry_xp );
3355
3356	#if(DEBUG_VFS_ADD_CHILD & 1)
3357	if( DEBUG_VFS_ADD_CHILD < cycle )
3358	printk("\n[%s] thread[%x,%x] link dentry(%x,%x) to parent inode(%x,%x)\n",
3359	__FUNCTION__, this->process->pid, this->trdid,
3360	parent_cxy, new_dentry_ptr, parent_cxy, parent_inode_ptr );
3361	#endif
3362
3363	// 5. update "parent" and "child_xp" fields in new_dentry
3364	hal_remote_s64( XPTR( parent_cxy , &new_dentry_ptr->child_xp ) , new_inode_xp );
3365	hal_remote_spt( XPTR( parent_cxy , &new_dentry_ptr->parent ) , parent_inode_ptr );
3366
3367	#if DEBUG_VFS_ADD_CHILD
3368	cycle = (uint32_t)hal_get_cycles();
3369	if( DEBUG_VFS_ADD_CHILD < cycle )
3370	printk("\n[%s] thread[%x,%x] exit for <%s> / cycle %d\n",
3371	__FUNCTION__, this->process->pid, this->trdid, name, cycle );
3372	#endif
3373
3374	// return extended pointer on dentry & child inode
3375	*child_dentry_xp = new_dentry_xp;
3376	*child_inode_xp = new_inode_xp;
3377	return 0;
3378
3379	} // end vfs_add_child_in_parent()
3380
3381	/////////////////////////////////////////////////////
3382	void vfs_remove_child_from_parent( xptr_t dentry_xp )
3383	{
3384	cxy_t parent_cxy; // parent inode cluster identifier
3385	cxy_t child_cxy; // child inode cluster identifier
3386	vfs_dentry_t * dentry_ptr; // local pointer on dentry
3387	xptr_t child_inode_xp; // extended pointer on child inode
3388	vfs_inode_t * child_inode_ptr; // local pointer on child inode
3389	vfs_inode_t * parent_inode_ptr; // local pointer on parent inode
3390	uint32_t links; // number of child inode parents
3391
3392	char dentry_name[CONFIG_VFS_MAX_NAME_LENGTH];
3393
3394	// get parent cluster and dentry local pointer
3395	parent_cxy = GET_CXY( dentry_xp );
3396	dentry_ptr = GET_PTR( dentry_xp );
3397
3398	// get a local copy of dentry name
3399	hal_remote_strcpy( XPTR( local_cxy , dentry_name ),
3400	XPTR( parent_cxy , &dentry_ptr->name ) );
3401
3402	// get parent_inode local pointer
3403	parent_inode_ptr = hal_remote_lpt( XPTR( parent_cxy , &dentry_ptr->parent ) );
3404
3405	// get child cluster and child_inode pointers
3406	child_inode_xp = hal_remote_l64( XPTR( parent_cxy , &dentry_ptr->child_xp ) );
3407	child_cxy = GET_CXY( child_inode_xp );
3408	child_inode_ptr = GET_PTR( child_inode_xp );
3409
3410	// remove dentry from parent_inode
3411	xhtab_remove( XPTR( parent_cxy , &parent_inode_ptr->children ),
3412	dentry_name,
3413	XPTR( parent_cxy , &dentry_ptr->children ) );
3414
3415	// remove dentry from child_inode
3416	xlist_unlink( XPTR( parent_cxy , &dentry_ptr->parents ) );
3417	links = hal_remote_atomic_add( XPTR( child_cxy , &child_inode_ptr->links ) , -1 );
3418
3419	// delete dentry descriptor
3420	if( parent_cxy == local_cxy )
3421	{
3422	vfs_dentry_destroy( dentry_ptr );
3423	}
3424	else
3425	{
3426	rpc_vfs_dentry_destroy_client( parent_cxy,
3427	dentry_ptr );
3428	}
3429
3430	// delete child_inode descriptor if last link
3431	if( links == 1 )
3432	{
3433	if( child_cxy == local_cxy )
3434	{
3435	vfs_inode_destroy( child_inode_ptr );
3436	}
3437	else
3438	{
3439	rpc_vfs_inode_destroy_client( child_cxy , child_inode_ptr );
3440	}
3441	}
3442
3443	} // end vfs_remove_child_from_parent()
3444
3445
3446
3447
3448	//////////////////////////////////////////////////////////////////////////////////////////
3449	// API used by VFS to access a specific FS
3450	//////////////////////////////////////////////////////////////////////////////////////////
3451
3452	//////////////////////////////////////////////
3453	error_t vfs_fs_move_page( xptr_t page_xp,
3454	cmd_type_t cmd_type )
3455	{
3456	error_t error = 0;
3457
3458	assert( (page_xp != XPTR_NULL) , "page pointer is NULL" );
3459
3460	page_t * page_ptr = GET_PTR( page_xp );
3461	cxy_t page_cxy = GET_CXY( page_xp );
3462
3463	// get local pointer on page mapper
3464	mapper_t * mapper = hal_remote_lpt( XPTR( page_cxy , &page_ptr->mapper ) );
3465
3466	assert( (mapper != NULL) , "no mapper for page" );
3467
3468	// get FS type
3469	vfs_fs_type_t fs_type = hal_remote_l32( XPTR( page_cxy , &mapper->type ) );
3470
3471	// call relevant FS function
3472	if( fs_type == FS_TYPE_FATFS )
3473	{
3474	error = fatfs_move_page( page_xp , cmd_type );
3475	}
3476	else if( fs_type == FS_TYPE_RAMFS )
3477	{
3478	assert( false , "should not be called for RAMFS\n" );
3479	}
3480	else if( fs_type == FS_TYPE_DEVFS )
3481	{
3482	assert( false , "should not be called for DEVFS\n" );
3483	}
3484	else
3485	{
3486	assert( false , "undefined file system type" );
3487	}
3488
3489	return error;
3490
3491	} // end vfs_fs_move_page()
3492
3493	////////////////////////////////////////////////
3494	error_t vfs_fs_add_dentry( vfs_inode_t * inode,
3495	vfs_dentry_t * dentry )
3496	{
3497	error_t error = 0;
3498
3499	assert( (inode != NULL) , "inode pointer is NULL" );
3500	assert( (dentry != NULL) , "dentry pointer is NULL" );
3501
3502	mapper_t * mapper = inode->mapper;
3503
3504	assert( (mapper != NULL) , "mapper pointer is NULL" );
3505
3506	// get FS type
3507	vfs_fs_type_t fs_type = mapper->type;
3508
3509	// call relevant FS function
3510	if( fs_type == FS_TYPE_FATFS )
3511	{
3512	error = fatfs_add_dentry( inode , dentry );
3513	}
3514	else if( fs_type == FS_TYPE_RAMFS )
3515	{
3516	error = 0; // does nothing for RAMFS
3517	}
3518	else if( fs_type == FS_TYPE_DEVFS )
3519	{
3520	error = 0; // does nothing for DEVFS
3521	}
3522	else
3523	{
3524	assert( false , "undefined file system type" );
3525	}
3526
3527	return error;
3528
3529	} // end vfs_fs_add_dentry()
3530
3531	///////////////////////////////////////////////////
3532	error_t vfs_fs_remove_dentry( vfs_inode_t * inode,
3533	vfs_dentry_t * dentry )
3534	{
3535	error_t error = 0;
3536
3537	assert( (inode != NULL) , "inode pointer is NULL" );
3538	assert( (dentry != NULL) , "dentry pointer is NULL" );
3539
3540	mapper_t * mapper = inode->mapper;
3541
3542	assert( (mapper != NULL) , "mapper pointer is NULL" );
3543
3544	// get FS type
3545	vfs_fs_type_t fs_type = mapper->type;
3546
3547	// call relevant FS function
3548	if( fs_type == FS_TYPE_FATFS )
3549	{
3550	error = fatfs_remove_dentry( inode , dentry );
3551	}
3552	else if( fs_type == FS_TYPE_RAMFS )
3553	{
3554	error = 0; // does nothing for RAMFS
3555	}
3556	else if( fs_type == FS_TYPE_DEVFS )
3557	{
3558	error = 0; // does nothing for DEVFS
3559	}
3560	else
3561	{
3562	assert( false , "undefined file system type" );
3563	}
3564
3565	return error;
3566
3567	} // end vfs_fs_remove_dentry()
3568
3569	////////////////////////////////////////////////
3570	error_t vfs_fs_new_dentry( vfs_inode_t * parent,
3571	char * name,
3572	xptr_t child_xp )
3573	{
3574	error_t error = 0;
3575
3576	// check arguments
3577	assert( (parent != NULL) , "parent pointer is NULL");
3578	assert( (child_xp != XPTR_NULL) , "child pointer is NULL");
3579
3580	// get parent inode FS type
3581	vfs_fs_type_t fs_type = parent->ctx->type;
3582
3583	// call relevant FS function
3584	if( fs_type == FS_TYPE_FATFS )
3585	{
3586	error = fatfs_new_dentry( parent , name , child_xp );
3587	}
3588	else if( fs_type == FS_TYPE_RAMFS )
3589	{
3590	assert( false , "should not be called for RAMFS" );
3591	}
3592	else if( fs_type == FS_TYPE_DEVFS )
3593	{
3594	assert( false , "should not be called for DEVFS" );
3595	}
3596	else
3597	{
3598	assert( false , "undefined file system type" );
3599	}
3600
3601	return error;
3602
3603	} // end vfs_fs_new_dentry()
3604
3605	///////////////////////////////////////////////////
3606	error_t vfs_fs_update_dentry( vfs_inode_t * inode,
3607	vfs_dentry_t * dentry,
3608	uint32_t size )
3609	{
3610	error_t error = 0;
3611
3612	// check arguments
3613	assert( (inode != NULL) , "inode pointer is NULL");
3614	assert( (dentry != NULL) , "dentry pointer is NULL");
3615
3616	// get parent inode FS type
3617	vfs_fs_type_t fs_type = inode->ctx->type;
3618
3619	// call relevant FS function
3620	if( fs_type == FS_TYPE_FATFS )
3621	{
3622	error = fatfs_update_dentry( inode , dentry , size );
3623	}
3624	else if( fs_type == FS_TYPE_RAMFS )
3625	{
3626	assert( false , "should not be called for RAMFS" );
3627	}
3628	else if( fs_type == FS_TYPE_DEVFS )
3629	{
3630	assert( false , "should not be called for DEVFS" );
3631	}
3632	else
3633	{
3634	assert( false , "undefined file system type" );
3635	}
3636
3637	return error;
3638
3639	} // end vfs_fs_update_dentry()
3640
3641	///////////////////////////////////////////////////
3642	error_t vfs_fs_get_user_dir( vfs_inode_t * inode,
3643	struct dirent * array,
3644	uint32_t max_dirent,
3645	uint32_t min_dentry,
3646	bool_t detailed,
3647	uint32_t * entries,
3648	bool_t * done )
3649	{
3650	error_t error = 0;
3651
3652	// check arguments
3653	assert( (inode != NULL) , "parent pointer is NULL");
3654	assert( (array != NULL) , "child pointer is NULL");
3655	assert( (detailed == false) , "detailed argument not supported\n");
3656
3657	// check inode type
3658	if( inode->type != INODE_TYPE_DIR )
3659	{
3660	printk("\n[ERROR] in %s : target inode is not a directory\n",
3661	__FUNCTION__ );
3662	return -1;
3663	}
3664
3665	// get parent inode FS type
3666	vfs_fs_type_t fs_type = inode->ctx->type;
3667
3668	// call relevant FS function
3669	if( fs_type == FS_TYPE_FATFS )
3670	{
3671	error = fatfs_get_user_dir( inode,
3672	array,
3673	max_dirent,
3674	min_dentry,
3675	detailed,
3676	entries,
3677	done );
3678	}
3679	else if( fs_type == FS_TYPE_RAMFS )
3680	{
3681	assert( false , "should not be called for RAMFS" );
3682	}
3683	else if( fs_type == FS_TYPE_DEVFS )
3684	{
3685	error = devfs_get_user_dir( inode,
3686	array,
3687	max_dirent,
3688	min_dentry,
3689	detailed,
3690	entries,
3691	done );
3692	}
3693	else
3694	{
3695	assert( false , "undefined file system type" );
3696	}
3697
3698	return error;
3699
3700	} // end vfs_fs_get_user_dir()
3701
3702	////////////////////////////////////////////////
3703	error_t vfs_fs_sync_inode( vfs_inode_t * inode )
3704	{
3705	error_t error = 0;
3706
3707	// check arguments
3708	assert( (inode != NULL) , "inode pointer is NULL");
3709
3710	// get inode FS type
3711	vfs_fs_type_t fs_type = inode->ctx->type;
3712
3713	// call relevant FS function
3714	if( fs_type == FS_TYPE_FATFS )
3715	{
3716	error = fatfs_sync_inode( inode );
3717	}
3718	else if( fs_type == FS_TYPE_RAMFS )
3719	{
3720	assert( false , "should not be called for RAMFS" );
3721	}
3722	else if( fs_type == FS_TYPE_DEVFS )
3723	{
3724	assert( false , "should not be called for DEVFS" );
3725	}
3726	else
3727	{
3728	assert( false , "undefined file system type" );
3729	}
3730
3731	return error;
3732
3733	} // end vfs_fs_sync_inode()
3734
3735	////////////////////////////////////////////////
3736	error_t vfs_fs_sync_fat( vfs_fs_type_t fs_type )
3737	{
3738	error_t error = 0;
3739
3740	// call relevant FS function
3741	if( fs_type == FS_TYPE_FATFS )
3742	{
3743	error = fatfs_sync_fat();
3744	}
3745	else if( fs_type == FS_TYPE_RAMFS )
3746	{
3747	assert( false , "should not be called for RAMFS" );
3748	}
3749	else if( fs_type == FS_TYPE_DEVFS )
3750	{
3751	assert( false , "should not be called for DEVFS" );
3752	}
3753	else
3754	{
3755	assert( false , "undefined file system type" );
3756	}
3757
3758	return error;
3759
3760	} // end vfs_fs_sync_fat()
3761
3762	//////////////////////////////////////////////////////
3763	error_t vfs_fs_sync_free_info( vfs_fs_type_t fs_type )
3764	{
3765	error_t error = 0;
3766
3767	// call relevant FS function
3768	if( fs_type == FS_TYPE_FATFS )
3769	{
3770	error = fatfs_sync_free_info();
3771	}
3772	else if( fs_type == FS_TYPE_RAMFS )
3773	{
3774	assert( false , "should not be called for RAMFS" );
3775	}
3776	else if( fs_type == FS_TYPE_DEVFS )
3777	{
3778	assert( false , "should not be called for DEVFS" );
3779	}
3780	else
3781	{
3782	assert( false , "undefined file system type" );
3783	}
3784
3785	return error;
3786
3787	} // end vfs_fs_sync_fat()
3788
3789	/////////////////////////////////////////////////
3790	error_t vfs_fs_cluster_alloc( uint32_t fs_type,
3791	uint32_t * cluster )
3792	{
3793	error_t error = 0;
3794
3795	// call relevant FS function
3796	if( fs_type == FS_TYPE_FATFS )
3797	{
3798	error = fatfs_cluster_alloc( cluster );
3799	}
3800	else if( fs_type == FS_TYPE_RAMFS )
3801	{
3802	assert( false , "should not be called for RAMFS" );
3803	}
3804	else if( fs_type == FS_TYPE_DEVFS )
3805	{
3806	assert( false , "should not be called for DEVFS" );
3807	}
3808	else
3809	{
3810	assert( false , "undefined file system type" );
3811	}
3812
3813	return error;
3814
3815	} // end vfs_fs_alloc_cluster()
3816
3817	////////////////////////////////////////////////
3818	error_t vfs_fs_release_inode( xptr_t inode_xp )
3819	{
3820	error_t error = 0;
3821
3822	assert( (inode_xp != XPTR_NULL) , "inode pointer is NULL")
3823
3824	vfs_inode_t * inode_ptr = GET_PTR( inode_xp );
3825	cxy_t inode_cxy = GET_CXY( inode_xp );
3826
3827	// get local pointer on page mapper
3828	mapper_t * mapper = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
3829
3830	assert( (mapper != NULL) , "mapper pointer is NULL")
3831
3832	// get FS type from mapper
3833	vfs_fs_type_t fs_type = hal_remote_l32( XPTR( inode_cxy , &mapper->type ) );
3834
3835	// call relevant FS function
3836	if( fs_type == FS_TYPE_FATFS )
3837	{
3838	error = fatfs_release_inode( inode_xp );
3839	}
3840	else if( fs_type == FS_TYPE_RAMFS )
3841	{
3842	assert( false , "should not be called for RAMFS" );
3843	}
3844	else if( fs_type == FS_TYPE_DEVFS )
3845	{
3846	assert( false , "should not be called for DEVFS" );
3847	}
3848	else
3849	{
3850	assert( false , "undefined file system type" );
3851	}
3852
3853	return error;
3854
3855	} // end vfs_fs_release_inode()
3856
3857

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

Download in other formats: