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fat32.c @ 810

Last change on this file since 810 was 808, checked in by alain, 9 years ago
Introduce the O_WRONLY and O_RDWR flags for the giet_fat_open system call.
Property svn:executable set to ``*
File size: 150.2 KB

Line
1	//////////////////////////////////////////////////////////////////////////////////
2	// Date : 01/06/2015
3	// Authors : Alain Greiner
4	// Copyright (c) UPMC-LIP6
5	//////////////////////////////////////////////////////////////////////////////////
6	// The fat32.h and fat32.c files define a library of access functions
7	// to a FAT32 disk on a block device. It is intended to be used by both
8	// the boot code and the kernel code.
9	//////////////////////////////////////////////////////////////////////////////////
10	// Implementation notes:
11	// 1. the "lba" (Logical Block Address) is the physical sector index on
12	// the block device. The physical sector size is supposed to be 512 bytes.
13	// 2. the "cluster" variable is actually a cluster index. A cluster contains
14	// 8 sectors (4K bytes) and the cluster index is a 32 bits word.
15	// 3. Each file or directory referenced by the software is represented
16	// by an "inode". The set of "inodes" is organised as a tree, that is
17	// a sub-tree of the complete file system existing on the block device.
18	// 4. A given file can be referenced by several software tasks, and each task
19	// will use a private handler, called a "file descriptor", allocated by the OS
20	// when the task open the file, that is organised as an indexed array.
21	// 5. This FAT32 library implements (N+1) caches : one private "File_ Cache"
22	// for each referenced file or directory, and a specific "Fat_Cache" for
23	// the FAT itself. Each cache contain a variable number of clusters that are
24	// dynamically allocated when they are accessed, and organised as a 64-Tree.
25	//////////////////////////////////////////////////////////////////////////////////
26	// General Debug Policy:
27	// The global variable GIET_DEBUG_FAT is defined in the giet_config.h file.
28	// The debug is activated if (proctime > GIET_DEBUG_FAT) && (GIET_DEBUG_FAT != 0)
29	// The GIET_DEBUG_FAT bit 0 defines the level of debug:
30	// if (GIET_DEBUG_FAT & 0x1) => detailed debug
31	// else => external functions only
32	//////////////////////////////////////////////////////////////////////////////////
33
34	#include <giet_config.h>
35	#include <hard_config.h>
36	#include <fat32.h>
37	#include <utils.h>
38	#include <vmem.h>
39	#include <kernel_malloc.h>
40	#include <ctx_handler.h>
41	#include <bdv_driver.h>
42	#include <hba_driver.h>
43	#include <sdc_driver.h>
44	#include <rdk_driver.h>
45	#include <mmc_driver.h>
46	#include <tty0.h>
47	#include <stdio.h>
48
49	//////////////////////////////////////////////////////////////////////////////////
50	// Global variables
51	//////////////////////////////////////////////////////////////////////////////////
52
53	// Fat-Descriptor
54	__attribute__((section(".kdata")))
55	fat_desc_t _fat __attribute__((aligned(64)));
56
57	// buffer used by boot code as a simple cache when scanning FAT
58	__attribute__((section(".kdata")))
59	unsigned char _fat_buffer_fat[4096] __attribute__((aligned(64)));
60
61	// buffer used by boot code as a simple cache when scanning a directory in DATA region
62	__attribute__((section(".kdata")))
63	unsigned char _fat_buffer_data[4096] __attribute__((aligned(64)));
64
65	// lba of cluster in fat_buffer_fat
66	__attribute__((section(".kdata")))
67	unsigned int _fat_buffer_fat_lba;
68
69	// lba of cluster in fat_buffer_data
70	__attribute__((section(".kdata")))
71	unsigned int _fat_buffer_data_lba;
72
73	//////////////////////////////////////////////////////////////////////////////////
74	//////////////////////////////////////////////////////////////////////////////////
75	// Static functions declaration
76	//////////////////////////////////////////////////////////////////////////////////
77	//////////////////////////////////////////////////////////////////////////////////
78
79
80	#if GIET_DEBUG_FAT
81
82	static void _display_fat_descriptor();
83
84	static void _display_clusters_list();
85
86	#endif
87
88	static void _get_name_from_long( unsigned char* buffer,
89	char* name );
90
91	static void _get_name_from_short( unsigned char* buffer,
92	char* name );
93
94	static inline unsigned int _get_levels_from_size( unsigned int size );
95
96	static unsigned int _get_name_from_path( char* pathname,
97	char* name,
98	unsigned int* nb_read );
99
100	static unsigned int _get_last_name( char* pathname,
101	char* name );
102
103	static unsigned int _get_fat_entry( unsigned int cluster,
104	unsigned int* value );
105
106	static unsigned int _set_fat_entry( unsigned int cluster,
107	unsigned int value );
108
109	static void _add_inode_in_tree( fat_inode_t* child,
110	fat_inode_t* parent );
111
112	static void _remove_inode_from_tree( fat_inode_t* inode );
113
114	static unsigned int _update_device_from_cache( unsigned int levels,
115	fat_cache_node_t* root,
116	char* string );
117
118	static unsigned int _set_fs_info();
119
120	static unsigned int _update_fs_info();
121
122	static unsigned int _read_entry( unsigned int offset,
123	unsigned int size,
124	unsigned char* buffer,
125	unsigned int little_indian );
126
127	static unsigned int _cluster_to_lba( unsigned int cluster );
128
129	static unsigned int _get_nb_entries( fat_inode_t* inode,
130	unsigned int* nb_entries );
131
132	static unsigned int _get_child_from_parent( fat_inode_t* parent,
133	char* name,
134	fat_inode_t** inode );
135
136	static unsigned int _get_inode_from_path( char* pathname,
137	fat_inode_t** inode );
138
139	static unsigned int _is_ancestor( fat_inode_t* a,
140	fat_inode_t* b);
141
142	static unsigned int _get_sfn_name( char* name,
143	unsigned int* length,
144	unsigned int* nb_lfn,
145	char* sfn,
146	unsigned char* checksum );
147
148	static unsigned int _update_dir_entry( fat_inode_t* inode );
149
150	static unsigned int _add_dir_entry( fat_inode_t* child );
151
152	static unsigned int _remove_dir_entry( fat_inode_t* inode );
153
154	static void _add_special_directories( fat_inode_t* child );
155
156	static unsigned int _one_cluster_allocate( fat_inode_t* inode,
157	unsigned int* cluster );
158
159	static unsigned int _all_clusters_release( fat_inode_t* inode );
160
161	static void _release_cache_memory( fat_cache_node_t* root,
162	unsigned int levels );
163
164	static fat_cache_node_t* _allocate_one_cache_node( fat_cache_node_t* first_child );
165
166	static fat_inode_t* _allocate_one_inode( char* name,
167	unsigned int is_dir,
168	unsigned int cluster,
169	unsigned int size,
170	unsigned int count,
171	unsigned int dentry,
172	unsigned int cache_allocate );
173
174	static void _allocate_one_buffer( fat_inode_t* inode,
175	unsigned int cluster_id,
176	unsigned int cluster );
177
178	static unsigned int _get_free_cluster( unsigned int* cluster );
179
180	static unsigned int _remove_node_from_fs( fat_inode_t* inode );
181
182	static unsigned int _file_info_no_cache( char* pathname,
183	unsigned int* file_cluster,
184	unsigned int* file_size );
185
186	static unsigned int _next_cluster_no_cache( unsigned int cluster,
187	unsigned int* next );
188
189	static inline int get_length( int offset , int length ) { return length; }
190
191	static inline int get_offset( int offset , int length ) { return offset; }
192
193
194
195	//////////////////////////////////////////////////////////////////////////////////
196	//////////////////////////////////////////////////////////////////////////////////
197	// Static functions definition
198	//////////////////////////////////////////////////////////////////////////////////
199	//////////////////////////////////////////////////////////////////////////////////
200
201
202	#if GIET_DEBUG_FAT
203	/////////////////////////////////////
204	static void _display_fat_descriptor()
205	{
206	_printf("\n############### FAT DESCRIPTOR ################################"
207	"\nFAT initialized %x"
208	"\nBlock Size (bytes) %x"
209	"\nCluster Size (bytes) %x"
210	"\nFAT region first lba %x"
211	"\nFAT region size (blocks) %x"
212	"\nDATA region first lba %x"
213	"\nDATA region size (blocks) %x"
214	"\nNumber of free clusters %x"
215	"\nFirst free cluster index %x"
216	"\nFat_cache_levels %d"
217	"\n#################################################################\n",
218	_fat.initialized,
219	_fat.sector_size,
220	_fat.cluster_size,
221	_fat.fat_lba,
222	_fat.fat_sectors,
223	_fat.data_lba,
224	_fat.data_sectors,
225	_fat.free_clusters_number,
226	_fat.free_cluster_hint,
227	_fat.fat_cache_levels );
228
229	} // end _display_fat_descriptor()
230	#endif
231
232
233	#if GIET_DEBUG_FAT
234	////////////////////////////////////////////////////////
235	static void _display_clusters_list( fat_inode_t* inode )
236	{
237	unsigned int next = 0;
238	unsigned int cluster_id = 0;
239	unsigned int current = inode->cluster;
240
241	_printf("\n --- clusters for <%s> ---\n",
242	inode->name );
243
244	while( current < END_OF_CHAIN_CLUSTER_MIN )
245	{
246	if ( (current < 2) \|\| (cluster_id >= 1024) )
247	{
248	_printf("\n[FAT ERROR] in _display_clusters_list()\n");
249	_exit();
250	}
251
252	_get_fat_entry( current , &next );
253	_printf(" > %X", current );
254	cluster_id++;
255	if ( (cluster_id & 0x7) == 0 ) _printf("\n");
256	current = next;
257	}
258	_printf("\n");
259	} // end _display_clusters_list()
260	#endif
261
262
263
264	/////////////////////////////////////////////////////////////////////
265	static inline unsigned int _get_levels_from_size( unsigned int size )
266	{
267	if ( size <= (1<<18) ) return 1; // 64 clusters == 256 Kbytes
268	else if ( size <= (1<<24) ) return 2; // 64 * 64 clusters => 16 Mbytes
269	else if ( size <= (1<<30) ) return 3; // 64 * 64 * 64 cluster => 1 Gbytes
270	else return 4; // 64 * 64 * 64 * 64 clusters
271	}
272
273
274
275	////////////////////////////////////////////////////////
276	static unsigned int _read_entry( unsigned int offset,
277	unsigned int size,
278	unsigned char* buffer,
279	unsigned int little_endian )
280	{
281	unsigned int n;
282	unsigned int res = 0;
283
284	if ( little_endian)
285	{
286	for( n = size ; n > 0 ; n-- ) res = (res<<8) \| buffer[offset+n-1];
287	}
288	else
289	{
290	for( n = 0 ; n < size ; n++ ) res = (res<<8) \| buffer[offset+n];
291	}
292	return res;
293
294	} // end _read_entry
295
296
297
298	//////////////////////////////////////////////////////////////////
299	static inline unsigned int _cluster_to_lba( unsigned int cluster )
300	{
301	if ( cluster < 2 )
302	{
303	_printf("\n[FAT ERROR] _cluster_to_lba(): cluster smaller than 2\n");
304	_exit();
305	}
306
307	return ((cluster - 2) << 3) + _fat.data_lba;
308	}
309
310
311	//////////////////////////////////////////////////////
312	static inline unsigned char _to_lower(unsigned char c)
313	{
314	if (c >= 'A' && c <= 'Z') return (c \| 0x20);
315	else return c;
316	}
317
318
319	//////////////////////////////////////////////////////
320	static inline unsigned char _to_upper(unsigned char c)
321	{
322	if (c >= 'a' && c <= 'z') return (c & ~(0x20));
323	else return c;
324	}
325
326
327
328	///////////////////////////////////////////////////////////////////////////
329	static unsigned int _get_name_from_path( char* pathname, // input
330	char* name, // output
331	unsigned int* nb_read ) // input & output
332	{
333	// skip leading "/" character
334	if ( pathname[nb_read] == '/' ) nb_read = *nb_read + 1;
335
336	// initialises current indexes
337	unsigned int i = *nb_read;
338	unsigned int j = 0;
339
340	while ( (pathname[i] != '/') && (pathname[i] != 0) )
341	{
342	name[j++] = pathname[i++];
343	if ( j > NAME_MAX_SIZE ) return 1;
344	}
345
346	// set end of string
347	name[j] = 0;
348
349	// skip trailing "/" character
350	if ( pathname[i] == '/' ) *nb_read += j+1;
351	else *nb_read += j;
352
353	return 0;
354	}
355
356
357
358	////////////////////////////////////////////////////////////////////
359	static unsigned int _get_last_name( char* pathname, // input
360	char* name ) // output
361	{
362	unsigned int nb_read = 0;
363	while ( pathname[nb_read] != 0 )
364	{
365	if ( _get_name_from_path( pathname, name, &nb_read ) ) return 1;
366	}
367
368	return 0;
369	} // end _get_last_name()
370
371
372
373	////////////////////////////////////////////////////////////////////////////////
374	static void _get_name_from_short( unsigned char* buffer, // input: SFN dir_entry
375	char* name ) // output: name
376	{
377	unsigned int i;
378	unsigned int j = 0;
379
380	// get name
381	for ( i = 0; i < 8 && buffer[i] != ' '; i++ )
382	{
383	name[j] = _to_lower( buffer[i] );
384	j++;
385	}
386
387	// get extension
388	for ( i = 8; i < 8 + 3 && buffer[i] != ' '; i++ )
389	{
390	// we entered the loop so there is an extension. add the dot
391	if ( i == 8 )
392	{
393	name[j] = '.';
394	j++;
395	}
396
397	name[j] = _to_lower( buffer[i] );
398	j++;
399	}
400
401	name[j] = '\0';
402	}
403
404	///////////////////////////////////////////////////////////////////////////////
405	static void _get_name_from_long( unsigned char* buffer, // input : LFN dir_entry
406	char* name ) // output : name
407	{
408	unsigned int name_offset = 0;
409	unsigned int buffer_offset = get_length(LDIR_ORD);
410	unsigned int l_name_1 = get_length(LDIR_NAME_1);
411	unsigned int l_name_2 = get_length(LDIR_NAME_2);
412	unsigned int l_name_3 = get_length(LDIR_NAME_3);
413	unsigned int l_attr = get_length(LDIR_ATTR);
414	unsigned int l_type = get_length(LDIR_TYPE);
415	unsigned int l_chksum = get_length(LDIR_CHKSUM);
416	unsigned int l_rsvd = get_length(LDIR_RSVD);
417
418	unsigned int j = 0;
419	unsigned int eof = 0;
420
421	while ( (buffer_offset != DIR_ENTRY_SIZE) && (!eof) )
422	{
423	while (j != l_name_1 && !eof )
424	{
425	if ( (buffer[buffer_offset] == 0x00) \|\|
426	(buffer[buffer_offset] == 0xFF) )
427	{
428	eof = 1;
429	continue;
430	}
431	name[name_offset] = buffer[buffer_offset];
432	buffer_offset += 2;
433	j += 2;
434	name_offset++;
435	}
436
437	buffer_offset += (l_attr + l_type + l_chksum);
438	j = 0;
439
440	while (j != l_name_2 && !eof )
441	{
442	if ( (buffer[buffer_offset] == 0x00) \|\|
443	(buffer[buffer_offset] == 0xFF) )
444	{
445	eof = 1;
446	continue;
447	}
448	name[name_offset] = buffer[buffer_offset];
449	buffer_offset += 2;
450	j += 2;
451	name_offset++;
452	}
453
454	buffer_offset += l_rsvd;
455	j = 0;
456
457	while (j != l_name_3 && !eof )
458	{
459	if ( (buffer[buffer_offset] == 0x00) \|\|
460	(buffer[buffer_offset] == 0xFF) )
461	{
462	eof = 1;
463	continue;
464	}
465	name[name_offset] = buffer[buffer_offset];
466	buffer_offset += 2;
467	j += 2;
468	name_offset++;
469	}
470	}
471	name[name_offset] = 0;
472	} // end get_name_from_long()
473
474
475
476	//////////////////////////////////////////////////////////////////////////////////
477	static fat_cache_node_t* _allocate_one_cache_node( fat_cache_node_t* first_child )
478	{
479	fat_cache_node_t* cnode;
480	unsigned int i;
481
482	cnode = _malloc( sizeof(fat_cache_node_t) );
483
484	cnode->children[0] = first_child;
485	for ( i = 1 ; i < 64 ; i++ )
486	cnode->children[i] = NULL;
487
488	return cnode;
489	} // end _allocate_one_cache_node()
490
491
492
493	////////////////////////////////////////////////////////////
494	static fat_inode_t* _allocate_one_inode( char* name,
495	unsigned int is_dir,
496	unsigned int cluster,
497	unsigned int size,
498	unsigned int count,
499	unsigned int dentry,
500	unsigned int cache_allocate )
501	{
502	fat_inode_t* new_inode = _malloc( sizeof(fat_inode_t) );
503
504	new_inode->parent = NULL; // set by _add_inode_in_tree()
505	new_inode->next = NULL; // set by _add_inode_in_tree()
506	new_inode->child = NULL; // set by _add_inode_in_tree()
507	new_inode->cluster = cluster;
508	new_inode->size = size;
509	new_inode->cache = NULL;
510	new_inode->levels = 0;
511	new_inode->count = count;
512	new_inode->is_dir = (is_dir != 0);
513	new_inode->dentry = dentry;
514
515	_strcpy( new_inode->name , name );
516
517	if ( cache_allocate )
518	{
519	new_inode->cache = _allocate_one_cache_node( NULL );
520	new_inode->levels = _get_levels_from_size( size );
521	}
522
523	return new_inode;
524	} // end _allocate_one_inode()
525
526
527
528
529	////////////////////////////////////////////////////
530	static void _add_inode_in_tree( fat_inode_t* child,
531	fat_inode_t* parent )
532	{
533	child->parent = parent;
534	child->next = parent->child;
535	parent->child = child;
536	} // end _add_inode-in_tree()
537
538
539
540
541	//////////////////////////////////////////////////////////
542	static void _remove_inode_from_tree( fat_inode_t* inode )
543	{
544	fat_inode_t* current;
545	fat_inode_t* prev = inode->parent->child;
546
547	if ( inode == prev ) // removed inode is first in its linked list
548	{
549	inode->parent->child = inode->next;
550	}
551	else // removed inode is not the first
552	{
553	for( current = prev->next ; current ; current = current->next )
554	{
555	if ( current == inode )
556	{
557	prev->next = current->next;
558	}
559	prev = current;
560	}
561	}
562	} // end _delete_one_inode()
563
564
565
566	/////////////////////////////////////////////////////////////////
567	static unsigned int _get_fat_entry( unsigned int cluster,
568	unsigned int* value )
569	{
570	// compute cluster_id & entry_id in FAT from cluster index
571	// a FAT buffer is an array of 1024 unsigned int entries
572	unsigned int cluster_id = cluster >> 10;
573	unsigned int entry_id = cluster & 0x3FF;
574
575	// get pointer on the relevant buffer descriptor in FAT cache
576	fat_cache_desc_t* pdesc;
577	unsigned int* buffer;
578	if ( _get_fat_cache_buffer( cluster_id, &pdesc ) ) return 1;
579
580	// get value from FAT slot
581	buffer = (unsigned int*)pdesc->buffer;
582	*value = buffer[entry_id];
583
584	return 0;
585	} // end _get_fat_entry()
586
587
588
589	////////////////////////////////////////////////////////////////
590	static inline unsigned int _set_fat_entry( unsigned int cluster,
591	unsigned int value )
592	{
593	// compute cluster_id & entry_id in FAT from cluster index
594	// a FAT cluster is an array of 1024 unsigned int entries
595	unsigned int cluster_id = cluster >> 10;
596	unsigned int entry_id = cluster & 0x3FF;
597
598	// get pointer on the relevant buffer descriptor in FAT cache
599	fat_cache_desc_t* pdesc;
600	unsigned int* buffer;
601	if ( _get_fat_cache_buffer( cluster_id, &pdesc ) ) return 1;
602
603	// set value into FAT slot
604	buffer = (unsigned int*)pdesc->buffer;
605	buffer[entry_id] = value;
606	pdesc->dirty = 1;
607
608	return 0;
609	} // end _set_fat_entry()
610
611
612
613	//////////////////////////////////////////////////////
614	static void _allocate_one_buffer( fat_inode_t* inode,
615	unsigned int cluster_id,
616	unsigned int cluster )
617	{
618	// add cache levels if needed
619	while ( _get_levels_from_size( (cluster_id + 1) * 4096 ) > inode->levels )
620	{
621
622	#if GIET_DEBUG_FAT
623	if ( _get_proctime() > GIET_DEBUG_FAT )
624	_printf("\n[DEBUG FAT] _allocate_one_buffer(): adding a cache level for %s\n",
625	inode->name );
626	#endif
627
628	inode->cache = _allocate_one_cache_node( inode->cache );
629	inode->levels++;
630	}
631
632	// search the 64-tree cache from top to bottom
633	fat_cache_node_t* node = inode->cache;
634	unsigned int level;
635
636	for ( level = inode->levels; level != 0; level-- )
637	{
638	// compute child index
639	unsigned int index = (cluster_id >> (6*(level-1))) & 0x3F;
640
641	if ( level == 1 ) // last level => children are cluster descriptors
642	{
643	fat_cache_desc_t* pdesc = (fat_cache_desc_t*)node->children[index];
644
645	if ( pdesc != NULL ) // slot not empty!!!
646	{
647	_printf("\n[FAT ERROR] in _allocate_one buffer() : slot not empty "
648	"in File-Cache <%s>\n cluster_id = %d / cache = %x / pdesc[0] = %x\n",
649	inode->name , cluster_id ,
650	(unsigned int)node , (unsigned int)pdesc );
651	_exit();
652	}
653
654	#if GIET_DEBUG_FAT
655	if ( _get_proctime() > GIET_DEBUG_FAT )
656	_printf("\n[DEBUG FAT] _allocate_one_buffer(): buffer allocated to <%s> for cluster_id %d\n",
657	inode->name, cluster_id );
658	#endif
659
660	// allocate buffer descriptor
661	pdesc = _malloc( sizeof(fat_cache_desc_t) );
662	pdesc->lba = _cluster_to_lba( cluster );
663	pdesc->buffer = _malloc( 4096 );
664	pdesc->dirty = 1;
665	node->children[index] = pdesc;
666	}
667	else // not last level => children are 64-tree nodes
668	{
669	fat_cache_node_t* child = (fat_cache_node_t*)node->children[index];
670	if ( child == NULL ) // miss
671	{
672	// allocate a cache node if miss
673	child = _allocate_one_cache_node( NULL );
674	node->children[index] = child;
675	}
676
677	// prepare next iteration
678	node = child;
679	}
680	} // end for
681	} // end _allocate_one_buffer
682
683
684
685
686	///////////////////////////////////////////////////////////////
687	static unsigned int _get_free_cluster( unsigned int* cluster )
688	{
689	// scan FAT to get next free cluster index
690	unsigned int current = _fat.free_cluster_hint;
691	unsigned int max = (_fat.data_sectors >> 3);
692	unsigned int value;
693	while ( current < max )
694	{
695	// get FAT entry indexed by current
696	if ( _get_fat_entry( current , &value ) ) return 1;
697
698	// return if free
699	if ( value == FREE_CLUSTER )
700	{
701	*cluster = current;
702	return 0;
703	}
704
705	// increment current
706	current++;
707	}
708
709	// return error if not found
710	return 1;
711
712	} // end _get_free_cluster()
713
714
715
716
717	//////////////////////////////////////////////////////////////////////////
718	static unsigned int _update_device_from_cache( unsigned int levels,
719	fat_cache_node_t* root,
720	char* string )
721	{
722	unsigned int index;
723	unsigned int ret = 0;
724
725	if ( levels == 1 ) // last level => children are buffer descriptors
726	{
727	for( index = 0 ; index < 64 ; index++ )
728	{
729	fat_cache_desc_t* pdesc = root->children[index];
730	if ( pdesc != NULL )
731	{
732	// update cluster on device if dirty
733	if ( pdesc->dirty )
734	{
735	if ( _fat_ioc_access( 1, // descheduling
736	0, // to block device
737	pdesc->lba,
738	(unsigned int)pdesc->buffer,
739	8 ) )
740	{
741	_printf("\n[FAT_ERROR] _update_device from_cache(): "
742	" cannot access lba = %x\n", pdesc->lba );
743	ret = 1;
744	}
745	else
746	{
747	pdesc->dirty = 0;
748
749	#if GIET_DEBUG_FAT
750	if ( _get_proctime() > GIET_DEBUG_FAT )
751	_printf("\n[DEBUG FAT] _update_device_from_cache(): cluster_id = %d for <%s>\n",
752	index , string );
753	#endif
754
755	}
756	}
757	}
758	}
759	}
760	else // not the last level = recursive call on each children
761	{
762	for( index = 0 ; index < 64 ; index++ )
763	{
764	fat_cache_node_t* pnode = root->children[index];
765	if ( pnode != NULL )
766	{
767	if ( _update_device_from_cache( levels - 1,
768	root->children[index],
769	string ) ) ret = 1;
770	}
771	}
772	}
773	return ret;
774	} // end _update_device_from_cache()
775
776
777
778	///////////////////////////////////////////////////////////////////
779	static void _release_cache_memory( fat_cache_node_t* root,
780	unsigned int levels )
781	{
782	unsigned int i;
783
784	if ( levels == 1 ) // last level => children are cluster descriptors
785	{
786	for( i = 0 ; i < 64 ; i++ )
787	{
788	fat_cache_desc_t* pdesc = root->children[i];
789
790	if ( pdesc != NULL )
791	{
792	_free( pdesc->buffer );
793	_free( pdesc );
794	root->children[i] = NULL;
795	}
796	}
797	}
798	else // not the last level = recursive call on each children
799	{
800	for( i = 0 ; i < 64 ; i++ )
801	{
802	fat_cache_node_t* cnode = root->children[i];
803
804	if ( cnode != NULL )
805	{
806	_release_cache_memory( cnode, levels - 1 );
807	_free( cnode );
808	root->children[i] = NULL;
809	}
810	}
811	}
812	} // end _release_cache_memory()
813
814
815
816
817
818	////////////////////////////////////////////////////////////////
819	static unsigned int _one_cluster_allocate( fat_inode_t* inode,
820	unsigned int* cluster )
821	{
822
823	#if GIET_DEBUG_FAT
824	if ( _get_proctime() > GIET_DEBUG_FAT )
825	_printf("\n[DEBUG FAT] _one_cluster_allocate(): enter for <%s>\n", inode->name );
826	#endif
827
828	// Check free cluster available
829	if ( _fat.free_clusters_number == 0 )
830	{
831	_printf("\n[FAT ERROR] in _one_cluster_allocate(): no more free clusters\n");
832	return 1;
833	}
834
835	// scan the Fat-Cache to get last allocated cluster index
836	unsigned int nb_current_clusters = 0;
837	unsigned int current = inode->cluster;
838	unsigned int last = current;
839	unsigned int next = 0;
840	unsigned int new = 0;
841	while ( current < END_OF_CHAIN_CLUSTER_MIN )
842	{
843	// get next cluster
844	if ( _get_fat_entry( current , &next ) ) return 1;
845
846	// increment number of allocated clusters
847	nb_current_clusters++;
848
849	// update loop variables
850	last = current;
851	current = next;
852	}
853
854	// allocate one free cluster from FAT
855	if ( _get_free_cluster( &new ) )
856	{
857	_printf("\n[FAT ERROR] in _one_cluster_allocate() : no more free clusters\n");
858	return 1;
859	}
860
861	// allocate one 4K buffer to File-Cache
862	_allocate_one_buffer( inode,
863	nb_current_clusters,
864	new );
865
866	// update allocated FAT slot
867	if ( _set_fat_entry( new , END_OF_CHAIN_CLUSTER_MAX ) ) return 1;
868
869	// update FAT descriptor global variables
870	_fat.free_clusters_number--;
871	_fat.free_cluster_hint = new;
872
873	// update cluster chaining
874	if ( nb_current_clusters == 0 ) // first cluster : update cluster field in inode
875	{
876	inode->cluster = new;
877	}
878	else // not the last : update previous last cluster in FAT
879	{
880	if ( _set_fat_entry( last , new ) ) return 1;
881	}
882
883	// update the FAT on device
884	if ( _update_device_from_cache( _fat.fat_cache_levels,
885	_fat.fat_cache_root,
886	"FAT" ) )
887	{
888	_printf("\n[FAT ERROR] in _one_cluster_allocate() updating FAT on device\n");
889	return 1;
890	}
891
892	// update FS-INFO sector on device
893	if ( _update_fs_info() )
894	{
895	_printf("\n[FAT ERROR] in _one_cluster_allocate() updating FS-INFO sector on device\n");
896	return 1;
897	}
898
899	#if GIET_DEBUG_FAT
900	if ( _get_proctime() > GIET_DEBUG_FAT )
901	_printf("\n[DEBUG FAT] _one_cluster_allocate(): for <%s> cluster = %x\n",
902	inode->name , new );
903	#endif
904
905	// returns allocated cluster index
906	*cluster = new;
907	return 0;
908
909	} // end _one_cluster_allocate()
910
911	////////////////////////////////////////////////////////////
912	// recursive function called by _all_clusters_release()
913	////////////////////////////////////////////////////////////
914	static unsigned int _cluster_release( unsigned int cluster )
915	{
916	if ( cluster < END_OF_CHAIN_CLUSTER_MIN ) // non terminal case
917	{
918	// get next cluster
919	unsigned int next;
920	if ( _get_fat_entry( cluster , &next ) ) return 1;
921
922	// call _cluster_release() on next cluster
923	if ( _cluster_release( next ) ) return 1;
924
925	// release cluster
926	if ( _set_fat_entry( cluster , FREE_CLUSTER ) ) return 1;
927
928	// Update free_cluster _hint and free_clusters_number in FAT descriptor
929	_fat.free_clusters_number++;
930	if ( cluster < _fat.free_cluster_hint ) _fat.free_cluster_hint = cluster;
931	}
932
933	// do nothing if terminal case : cluster == END_OF_CHAIN
934
935	return 0;
936
937	} // end _cluster_release()
938
939	///////////////////////////////////////////////////////////////
940	static unsigned int _all_clusters_release( fat_inode_t* inode )
941	{
942	// release recursively all clusters in FAT chaining reverse order
943	// starting from last cluster in chain, ending by first.
944
945	if ( _cluster_release( inode->cluster ) )
946	{
947	_printf("\n[FAT ERROR] in _all_clusters_release() releasing clusters\n");
948	return 1;
949	}
950
951	// update FAT on device
952	if ( _update_device_from_cache( _fat.fat_cache_levels,
953	_fat.fat_cache_root,
954	"FAT" ) )
955	{
956	_printf("\n[FAT ERROR] in _all_clusters_release() updating FAT on device\n");
957	return 1;
958	}
959
960	// update FS-INFO sector on device
961	if ( _update_fs_info() )
962	{
963	_printf("\n[FAT ERROR] in _all_clusters_release() updating FS_INFO sector\n");
964	return 1;
965	}
966
967	// update cluster field in inode
968	inode->cluster = END_OF_CHAIN_CLUSTER_MIN;
969
970	#if GIET_DEBUG_FAT
971	if ( _get_proctime() > GIET_DEBUG_FAT )
972	_printf("\n[DEBUG FAT] _all_clusters_release() done for file <%s>\n", inode->name );
973	#endif
974
975	return 0;
976	} // end _all_clusters_release()
977
978
979
980	///////////////////////////////////////////////////////////
981	static void _add_special_directories( fat_inode_t* child )
982	{
983	// get File-Cache buffer for child and cluster_id = 0
984	fat_cache_desc_t* pdesc = (fat_cache_desc_t*)child->cache->children[0];
985	unsigned char* entry;
986
987	unsigned int i;
988	unsigned int cluster;
989
990	// set "." entry (32 bytes)
991	entry = pdesc->buffer;
992	cluster = child->cluster;
993
994	for ( i = 0 ; i < 32 ; i++ )
995	{
996	if (i == 0 ) entry[i] = 0x2E; // SFN
997	else if (i < 11) entry[i] = 0x20; // SFN
998	else if (i == 11) entry[i] = 0x10; // ATTR == dir
999	else if (i == 20) entry[i] = cluster>>16; // cluster.B2
1000	else if (i == 21) entry[i] = cluster>>24; // cluster.B3
1001	else if (i == 26) entry[i] = cluster>>0; // cluster.B0
1002	else if (i == 27) entry[i] = cluster>>8; // cluster.B1
1003	else entry[i] = 0x00;
1004	}
1005
1006	// set ".." entry (32 bytes)
1007	entry = pdesc->buffer + 32;
1008	cluster = child->parent->cluster;
1009
1010	// handling special case when parent is root directory
1011	if ( cluster == 2 ) cluster = 0;
1012
1013	for ( i = 0 ; i < 32 ; i++ )
1014	{
1015	if (i < 2 ) entry[i] = 0x2E; // SFN
1016	else if (i < 11) entry[i] = 0x20; // SFN
1017	else if (i == 11) entry[i] = 0x10; // ATTR == dir
1018	else if (i == 20) entry[i] = cluster>>16; // cluster.B2
1019	else if (i == 21) entry[i] = cluster>>24; // cluster.B3
1020	else if (i == 26) entry[i] = cluster>>0; // cluster.B0
1021	else if (i == 27) entry[i] = cluster>>8; // cluster.B1
1022	else entry[i] = 0x00;
1023	}
1024	} // end _add_special_directories
1025
1026
1027
1028	////////////////////////////////////////////////////////////
1029	static unsigned int _is_ancestor( fat_inode_t* a,
1030	fat_inode_t* b )
1031	{
1032	while ( b )
1033	{
1034	if ( a == b )
1035	return 1;
1036
1037	b = b->parent;
1038	}
1039
1040	return 0;
1041	} // _is_ancestor()
1042
1043
1044
1045	////////////////////////////////////////////////////////////
1046	static unsigned int _get_sfn_name( char* name,
1047	unsigned int* length,
1048	unsigned int* nb_lfn,
1049	char* sfn,
1050	unsigned char* checksum )
1051	{
1052	// compute name length
1053	unsigned int name_length = _strlen( name );
1054
1055	// compute prefix and suffix length
1056	// only the last '.' is taken into account
1057	unsigned int suffix_length = 0;
1058	unsigned int prefix_length = 0;
1059	unsigned int dot_found = 0;
1060	unsigned int i;
1061	for ( i=0 ; i<name_length ; i++ )
1062	{
1063	if (name[i] == '.' )
1064	{
1065	if ( dot_found )
1066	{
1067	prefix_length += suffix_length + 1;
1068	suffix_length = 0;
1069	}
1070	else
1071	{
1072	dot_found = 1;
1073	}
1074	}
1075	else
1076	{
1077	if ( dot_found)
1078	{
1079	suffix_length++;
1080	}
1081	else
1082	{
1083	prefix_length++;
1084	}
1085	}
1086	}
1087
1088	// build SFN prefix (8bits)
1089	if (prefix_length <= 8)
1090	{
1091	for( i=0 ; i<8 ; i++)
1092	{
1093	if ( i<prefix_length ) sfn[i] = _to_upper( name[i] );
1094	else sfn[i] = 0x20;
1095	}
1096	}
1097	else
1098	{
1099	for( i=0 ; i<6 ; i++)
1100	{
1101	sfn[i] = _to_upper( name[i] );
1102	}
1103	sfn[6] = 0x7E;
1104	sfn[7] = 0x31;
1105	}
1106
1107	// build SFN suffix (3 bits)
1108	if ( suffix_length == 0 )
1109	{
1110	sfn[8] = 0x20;
1111	sfn[9] = 0x20;
1112	sfn[10] = 0x20;
1113	}
1114	else if ( suffix_length == 1 )
1115	{
1116	sfn[8] = _to_upper( name[name_length-1] );
1117	sfn[9] = 0x20;
1118	sfn[10] = 0x20;
1119	}
1120	else if ( suffix_length == 2 )
1121	{
1122	sfn[8] = _to_upper( name[name_length-2] );
1123	sfn[9] = _to_upper( name[name_length-1] );
1124	sfn[10] = 0x20;
1125	}
1126	else
1127	{
1128	sfn[8] = _to_upper( name[name_length-suffix_length] );
1129	sfn[9] = _to_upper( name[name_length-suffix_length+1] );
1130	sfn[10] = _to_upper( name[name_length-suffix_length+2] );
1131	}
1132
1133	// compute 8 bits checksum
1134	unsigned char sum = 0;
1135	for ( i=0 ; i<11 ; i++ )
1136	{
1137	sum = (((sum & 0x01)<<7) \| ((sum & 0xFE)>>1)) + sfn[i];
1138	}
1139	*checksum = sum;
1140
1141	// set nb_lfn and length values
1142	if ( name_length <= 13 )
1143	{
1144	*length = name_length;
1145	*nb_lfn = 1;
1146	return 0;
1147	}
1148	else if ( name_length <= 26 )
1149	{
1150	*length = name_length;
1151	*nb_lfn = 2;
1152	return 0;
1153	}
1154	else if ( name_length <= 31 )
1155	{
1156	*length = name_length;
1157	*nb_lfn = 3;
1158	return 0;
1159	}
1160	else
1161	{
1162	return 1;
1163	}
1164	} // _get_sfn_name()
1165
1166
1167
1168
1169	///////////////////////////////////////////////////////////
1170	static unsigned int _get_nb_entries( fat_inode_t* inode,
1171	unsigned int* nb_entries )
1172	{
1173	// scan directory until "end of directory" with two embedded loops:
1174	// - scan the clusters allocated to this directory
1175	// - scan the entries to find NO_MORE_ENTRY
1176	fat_cache_desc_t* pdesc; // pointer on buffer descriptor
1177	unsigned char* buffer; // 4 Kbytes buffer (one cluster)
1178	unsigned int ord; // ORD field in directory entry
1179	unsigned int attr; // ATTR field in directory entry
1180	unsigned int cluster_id = 0; // cluster index in directory
1181	unsigned int offset = 0; // position in scanned buffer
1182	unsigned int found = 0; // NO_MORE_ENTRY found
1183	unsigned int count = 0; // number of valid NORMAL entries
1184
1185	// loop on clusters allocated to directory
1186	while ( found == 0 )
1187	{
1188	// get one 4 Kytes buffer from File_Cache
1189	if ( _get_file_cache_buffer( inode,
1190	cluster_id,
1191	0,
1192	&pdesc ) ) return 1;
1193	buffer = pdesc->buffer;
1194
1195	// loop on directory entries in buffer
1196	while ( (offset < 4096) && (found == 0) )
1197	{
1198	attr = _read_entry( DIR_ATTR , buffer + offset , 0 );
1199	ord = _read_entry( LDIR_ORD , buffer + offset , 0 );
1200
1201	if ( ord == NO_MORE_ENTRY )
1202	{
1203	found = 1;
1204	}
1205	else if ( ord == FREE_ENTRY ) // free entry => skip
1206	{
1207	offset = offset + 32;
1208	}
1209	else if ( attr == ATTR_LONG_NAME_MASK ) // LFN entry => skip
1210	{
1211	offset = offset + 32;
1212	}
1213	else // NORMAL entry
1214	{
1215	offset = offset + 32;
1216	count++;
1217	}
1218	} // end loop on directory entries
1219
1220	cluster_id++;
1221	offset = 0;
1222
1223	} // end loop on clusters
1224
1225	// return nb_entries
1226	*nb_entries = count;
1227
1228	return 0;
1229	} // end _get_nb_entries()
1230
1231
1232
1233	////////////////////////////////////////////////////////////
1234	static unsigned int _update_dir_entry( fat_inode_t* inode )
1235	{
1236	// get Cache-File buffer containing the parent directory entry
1237	// 128 directories entries in one 4 Kbytes buffer
1238	fat_cache_desc_t* pdesc;
1239	unsigned char* buffer;
1240	unsigned int cluster_id = inode->dentry>>7;
1241	unsigned int offset = (inode->dentry & 0x7F)<<5;
1242
1243	if ( _get_file_cache_buffer( inode->parent,
1244	cluster_id,
1245	0,
1246	&pdesc ) ) return 1;
1247	buffer = pdesc->buffer;
1248	pdesc->dirty = 1;
1249
1250	// update size field
1251	buffer[offset + 28] = inode->size>>0; // size.B0
1252	buffer[offset + 29] = inode->size>>8; // size.B1
1253	buffer[offset + 30] = inode->size>>16; // size.B2
1254	buffer[offset + 31] = inode->size>>24; // size.B3
1255
1256	// update cluster field
1257	buffer[offset + 26] = inode->cluster>>0; // cluster.B0
1258	buffer[offset + 27] = inode->cluster>>8; // cluster.B1
1259	buffer[offset + 20] = inode->cluster>>16; // cluster.B2
1260	buffer[offset + 21] = inode->cluster>>24; // cluster.B3
1261
1262	return 0;
1263	} // end _update_dir_entry()
1264
1265
1266
1267
1268	//////////////////////////////////////////////////////////
1269	static unsigned int _add_dir_entry( fat_inode_t* child )
1270	{
1271	// get child attributes
1272	unsigned int is_dir = child->is_dir;
1273	unsigned int size = child->size;
1274	unsigned int cluster = child->cluster;
1275	fat_inode_t* parent = child->parent;
1276
1277	if ( parent == NULL ) return 1;
1278
1279	// compute number of required 32 bytes entries to store
1280	// the complete child name and a legal 8.3 SFN name.
1281	unsigned int length;
1282	unsigned int nb_lfn;
1283	char sfn[11];
1284	unsigned char checksum;
1285	if ( _get_sfn_name( child->name,
1286	&length,
1287	&nb_lfn,
1288	sfn,
1289	&checksum ) ) return 1;
1290
1291	#if GIET_DEBUG_FAT
1292	if ( _get_proctime() > GIET_DEBUG_FAT )
1293	_printf("\n[DEBUG FAT] _add_dir_entry(): try to add <%s> in <%s> / nb_lfn = %d\n",
1294	child->name , parent->name, nb_lfn );
1295	#endif
1296
1297	// Find end of directory : two embedded loops:
1298	// - scan the clusters allocated to this directory
1299	// - scan the entries to find NO_MORE_ENTRY
1300	fat_cache_desc_t* pdesc; // pointer on buffer descriptor
1301	unsigned char* buffer; // 4 Kbytes buffer (one cluster)
1302	unsigned int cluster_id = 0; // cluster index in directory
1303	unsigned int offset = 0; // position in scanned buffer
1304	unsigned int found = 0; // NO_MORE_ENTRY found
1305
1306	// loop on clusters allocated to directory
1307	while ( found == 0 )
1308	{
1309	// get the 4 Kytes buffer from File_Cache
1310	if ( _get_file_cache_buffer( parent,
1311	cluster_id,
1312	0,
1313	&pdesc ) ) return 1;
1314
1315	buffer = pdesc->buffer;
1316
1317	// loop on directory entries in buffer
1318	while ( (offset < 4096) && (found == 0) )
1319	{
1320	if ( _read_entry( LDIR_ORD , buffer + offset , 0 ) == NO_MORE_ENTRY )
1321	{
1322	found = 1;
1323	pdesc->dirty = 1;
1324	}
1325	else
1326	{
1327	offset = offset + 32;
1328	}
1329	} // end loop on entries
1330
1331	if ( found == 0 )
1332	{
1333	cluster_id++;
1334	offset = 0;
1335	}
1336	} // end loop on clusters
1337
1338	#if GIET_DEBUG_FAT
1339	if ( _get_proctime() > GIET_DEBUG_FAT )
1340	_printf("\n[DEBUG FAT] _add_dir_entry(): get NO_MORE directory entry : "
1341	" buffer = %x / offset = %x / cluster_id = %d\n",
1342	(unsigned int)buffer , offset , cluster_id );
1343	#endif
1344
1345	// enter FSM to modify parent directory:
1346	// The new child requires to write 3, 4, or 5 directory entries.
1347	// To actually register the new child, we use a 5 steps FSM
1348	// (one state per entry to be written), that is traversed as:
1349	// LFN3 -> LFN2 -> LFN1 -> NORMAL -> NOMORE
1350	// The buffer and first directory entry to be written are identified
1351	// by the variables : buffer / cluster_id / offset
1352
1353	unsigned char* name = (unsigned char*)child->name;
1354
1355	unsigned int step; // FSM state
1356
1357	if ( nb_lfn == 1 ) step = 3;
1358	else if ( nb_lfn == 2 ) step = 4;
1359	else if ( nb_lfn == 3 ) step = 5;
1360
1361	unsigned int i; // byte index in 32 bytes directory
1362	unsigned int c; // character index in name
1363	unsigned char* entry; // buffer + offset;
1364
1365	while ( step )
1366	{
1367	// get another buffer if required
1368	if ( offset >= 4096 ) // new buffer required
1369	{
1370	if ( _get_file_cache_buffer( parent,
1371	cluster_id + 1,
1372	0,
1373	&pdesc ) ) return 1;
1374	buffer = pdesc->buffer;
1375	pdesc->dirty = 1;
1376	offset = 0;
1377	}
1378
1379	// compute directory entry address
1380	entry = buffer + offset;
1381
1382	#if GIET_DEBUG_FAT
1383	if ( _get_proctime() > GIET_DEBUG_FAT )
1384	_printf("\n[DEBUG FAT] _add_dir_entry(): FSM step = %d /"
1385	" offset = %x / nb_lfn = %d\n", step, offset, nb_lfn );
1386	#endif
1387
1388	// write one 32 bytes directory entry per iteration
1389	switch ( step )
1390	{
1391	case 5: // write LFN3 entry
1392	{
1393	c = 26;
1394	// scan the 32 bytes in dir_entry
1395	for ( i = 0 ; i < 32 ; i++ )
1396	{
1397	if (i == 0)
1398	{
1399	if ( nb_lfn == 3) entry[i] = 0x43;
1400	else entry[i] = 0x03;
1401	}
1402	else if ( ( ((i >= 1 ) && (i<=10) && ((i&1)==1)) \|\|
1403	((i >= 14) && (i<=25) && ((i&1)==0)) \|\|
1404	((i >= 28) && (i<=31) && ((i&1)==0)) ) &&
1405	( c < length ) )
1406	{
1407	entry[i] = name[c];
1408	c++;
1409	}
1410	else if (i == 11) entry[i] = 0x0F;
1411	else if (i == 13) entry[i] = checksum;
1412	else entry[i] = 0x00;
1413	}
1414	step--;
1415	break;
1416	}
1417	case 4: // write LFN2 entry
1418	{
1419	c = 13;
1420	// scan the 32 bytes in dir_entry
1421	for ( i = 0 ; i < 32 ; i++ )
1422	{
1423	if (i == 0)
1424	{
1425	if ( nb_lfn == 2) entry[i] = 0x42;
1426	else entry[i] = 0x02;
1427	}
1428	else if ( ( ((i >= 1 ) && (i<=10) && ((i&1)==1)) \|\|
1429	((i >= 14) && (i<=25) && ((i&1)==0)) \|\|
1430	((i >= 28) && (i<=31) && ((i&1)==0)) ) &&
1431	( c < length ) )
1432	{
1433	entry[i] = name[c];
1434	c++;
1435	}
1436	else if (i == 11) entry[i] = 0x0F;
1437	else if (i == 13) entry[i] = checksum;
1438	else entry[i] = 0x00;
1439	}
1440	step--;
1441	break;
1442	}
1443	case 3: // Write LFN1 entry
1444	{
1445	c = 0;
1446	// scan the 32 bytes in dir_entry
1447	for ( i = 0 ; i < 32 ; i++ )
1448	{
1449	if (i == 0)
1450	{
1451	if ( nb_lfn == 1) entry[i] = 0x41;
1452	else entry[i] = 0x01;
1453	}
1454	else if ( ( ((i >= 1 ) && (i<=10) && ((i&1)==1)) \|\|
1455	((i >= 14) && (i<=25) && ((i&1)==0)) \|\|
1456	((i >= 28) && (i<=31) && ((i&1)==0)) ) &&
1457	( c < length ) )
1458	{
1459	entry[i] = name[c];
1460	c++;
1461	}
1462	else if (i == 11) entry[i] = 0x0F;
1463	else if (i == 13) entry[i] = checksum;
1464	else entry[i] = 0x00;
1465	}
1466	step--;
1467	break;
1468	}
1469	case 2: // write NORMAL entry
1470	{
1471	// scan the 32 bytes in dir_entry
1472	for ( i = 0 ; i < 32 ; i++ )
1473	{
1474	if ( i < 11 ) // 8.3 SFN
1475	{
1476	entry[i] = sfn[i];
1477	}
1478	else if (i == 11) // ATTR
1479	{
1480	if (is_dir) entry[i] = 0x10;
1481	else entry[i] = 0x20;
1482	}
1483	else if (i == 20) entry[i] = cluster>>16; // cluster.B2
1484	else if (i == 21) entry[i] = cluster>>24; // cluster.B3
1485	else if (i == 26) entry[i] = cluster>>0; // cluster.B0
1486	else if (i == 27) entry[i] = cluster>>8; // cluster.B1
1487	else if (i == 28) entry[i] = size>>0; // size.B0
1488	else if (i == 29) entry[i] = size>>8; // size.B1
1489	else if (i == 30) entry[i] = size>>16; // size.B2
1490	else if (i == 31) entry[i] = size>>24; // size.B3
1491	else entry[i] = 0x00;
1492	}
1493
1494	// update the dentry field in child inode
1495	child->dentry = ((cluster_id<<12) + offset)>>5;
1496
1497	step--;
1498	break;
1499	}
1500	case 1: // write NOMORE entry
1501	{
1502	entry [0] = 0x00;
1503	step--;
1504	break;
1505	}
1506	} // end switch step
1507	offset += 32;
1508	} // exit while => exit FSM
1509
1510	#if GIET_DEBUG_FAT
1511	if ( _get_proctime() > GIET_DEBUG_FAT )
1512	{
1513	_printf("\n[DEBUG FAT] _add_dir_entry(): <%s> successfully added in <%s>\n",
1514	child->name , parent->name );
1515	}
1516	#endif
1517
1518	return 0;
1519	} // end _add_dir_entry()
1520
1521
1522
1523	////////////////////////////////////////////////////////////
1524	static unsigned int _remove_dir_entry( fat_inode_t* inode )
1525	{
1526	// compute number of LFN entries
1527	unsigned int nb_lfn;
1528	unsigned int name_length = _strlen( inode->name );
1529	if ( name_length <= 13 ) nb_lfn = 1;
1530	else if ( name_length <= 26 ) nb_lfn = 2;
1531	else nb_lfn = 3;
1532
1533	// get cluster_id and offset in parent directory cache
1534	unsigned int dentry = inode->dentry;
1535	unsigned int cluster_id = dentry >> 7;
1536	unsigned int offset = (dentry & 0x7F)<<5;
1537
1538	// get buffer from parent directory cache
1539	unsigned char* buffer;
1540	fat_cache_desc_t* pdesc;
1541
1542	if ( _get_file_cache_buffer( inode->parent,
1543	cluster_id,
1544	0,
1545	&pdesc ) ) return 1;
1546	buffer = pdesc->buffer;
1547	pdesc->dirty = 1;
1548
1549	// invalidate NORMAL entry in directory cache
1550	buffer[offset] = 0xE5;
1551
1552	// invalidate LFN entries
1553	while ( nb_lfn )
1554	{
1555	if (offset == 0) // we must load buffer for (cluster_id - 1)
1556	{
1557	if ( cluster_id == 0 )
1558	break;
1559
1560	if ( _get_file_cache_buffer( inode->parent,
1561	cluster_id - 1,
1562	0,
1563	&pdesc ) ) return 1;
1564	buffer = pdesc->buffer;
1565	pdesc->dirty = 1;
1566	offset = 4096;
1567	}
1568
1569	offset = offset - 32;
1570
1571	// check for LFN entry
1572	if ( _read_entry( DIR_ATTR , buffer + offset , 0 ) != ATTR_LONG_NAME_MASK )
1573	break;
1574
1575	// invalidate LFN entry
1576	buffer[offset] = 0xE5;
1577
1578	nb_lfn--;
1579	}
1580
1581	return 0;
1582	} // end _remove_dir_entry
1583
1584
1585
1586
1587	//////////////////////////////////////////////////////////////////
1588	static unsigned int _get_child_from_parent( fat_inode_t* parent,
1589	char* name,
1590	fat_inode_t** inode )
1591	{
1592	fat_inode_t* current;
1593
1594	#if GIET_DEBUG_FAT
1595	if ( _get_proctime() > GIET_DEBUG_FAT )
1596	_printf("\n[DEBUG FAT] _get_child_from_parent(): search <%s> in directory <%s>\n",
1597	name , parent->name );
1598	#endif
1599
1600	// scan inodes in the parent directory
1601	for ( current = parent->child ; current ; current = current->next )
1602	{
1603	if ( _strcmp( name , current->name ) == 0 )
1604	{
1605
1606	#if GIET_DEBUG_FAT
1607	if ( _get_proctime() > GIET_DEBUG_FAT )
1608	_printf("\n[DEBUG FAT] _get_child_from_parent(): found inode for <%s> in <%s>\n",
1609	name , parent->name );
1610	#endif
1611	*inode = current;
1612	return 0; // name found
1613	}
1614	}
1615
1616	// not found in Inode-Tree => access the parent directory file_cache.
1617	// Two embedded loops:
1618	// - scan the clusters allocated to this directory
1619	// - scan the directory entries in each 4 Kbytes buffer
1620
1621	unsigned char* buffer; // pointer on one cache buffer
1622	char cname[32]; // buffer for one full entry name
1623	char lfn1[16]; // buffer for one partial name
1624	char lfn2[16]; // buffer for one partial name
1625	char lfn3[16]; // buffer for one partial name
1626	unsigned int size; // searched file/dir size (bytes)
1627	unsigned int cluster; // searched file/dir cluster index
1628	unsigned int is_dir; // searched file/dir type
1629	unsigned int attr; // directory entry ATTR field
1630	unsigned int ord; // directory entry ORD field
1631	unsigned int lfn = 0; // LFN entries number
1632	unsigned int dentry; // directory entry index
1633	unsigned int offset = 0; // byte offset in buffer
1634	unsigned int cluster_id = 0; // cluster index in directory
1635	int found = 0; // not found (0) / name found (1) / end of dir (-1)
1636
1637	#if GIET_DEBUG_FAT
1638	if ( _get_proctime() > GIET_DEBUG_FAT )
1639	_printf("\n[DEBUG FAT] _get_child_from_parent(): child <%s> in <%s> not found in Inode-Tree\n"
1640	" search in parent cache\n", name , parent->name );
1641	#endif
1642
1643	// scan the clusters allocated to parent directory
1644	while ( found == 0 )
1645	{
1646	// get one 4 Kytes buffer from parent File_Cache
1647	fat_cache_desc_t* pdesc;
1648	if ( _get_file_cache_buffer( parent,
1649	cluster_id,
1650	0,
1651	&pdesc ) ) return 2;
1652	buffer = pdesc->buffer;
1653
1654	// scan this buffer until end of directory, end of buffer, or name found
1655	while( (offset < 4096) && (found == 0) )
1656	{
1657	attr = _read_entry( DIR_ATTR , buffer + offset , 0 );
1658	ord = _read_entry( LDIR_ORD , buffer + offset , 0 );
1659
1660	if (ord == NO_MORE_ENTRY) // no more entry => break
1661	{
1662	found = -1;
1663	}
1664	else if ( ord == FREE_ENTRY ) // free entry => skip
1665	{
1666	offset = offset + 32;
1667	}
1668	else if ( attr == ATTR_LONG_NAME_MASK ) // LFN entry => get partial name
1669	{
1670	unsigned int seq = ord & 0x3;
1671	lfn = (seq > lfn) ? seq : lfn;
1672	if ( seq == 1 ) _get_name_from_long( buffer + offset, lfn1 );
1673	else if ( seq == 2 ) _get_name_from_long( buffer + offset, lfn2 );
1674	else if ( seq == 3 ) _get_name_from_long( buffer + offset, lfn3 );
1675	offset = offset + 32;
1676	}
1677	else // NORMAL entry
1678	{
1679	// build the extracted name
1680	if ( lfn == 0 )
1681	{
1682	_get_name_from_short( buffer + offset , cname );
1683	}
1684	else if ( lfn == 1 )
1685	{
1686	_strcpy( cname , lfn1 );
1687	}
1688	else if ( lfn == 2 )
1689	{
1690	_strcpy( cname , lfn1 );
1691	_strcpy( cname + 13 , lfn2 );
1692	}
1693	else if ( lfn == 3 )
1694	{
1695	_strcpy( cname , lfn1 );
1696	_strcpy( cname + 13 , lfn2 );
1697	_strcpy( cname + 26 , lfn3 );
1698	}
1699
1700	// get dentry arguments if extracted name == searched name
1701	if ( _strcmp( name , cname ) == 0 )
1702	{
1703	cluster = (_read_entry( DIR_FST_CLUS_HI , buffer + offset , 1 ) << 16) \|
1704	(_read_entry( DIR_FST_CLUS_LO , buffer + offset , 1 ) ) ;
1705	dentry = ((cluster_id<<12) + offset)>>5;
1706	is_dir = ((attr & ATTR_DIRECTORY) == ATTR_DIRECTORY);
1707	size = _read_entry( DIR_FILE_SIZE , buffer + offset , 1 );
1708	found = 1;
1709	}
1710	offset = offset + 32;
1711	lfn = 0;
1712	}
1713	} // end loop on directory entries
1714	cluster_id++;
1715	offset = 0;
1716	} // end loop on buffers
1717
1718	if ( found == -1 ) // found end of directory in parent directory
1719	{
1720
1721	#if GIET_DEBUG_FAT
1722	if ( _get_proctime() > GIET_DEBUG_FAT )
1723	_printf("\n[DEBUG FAT] _get_child_from_parent(): found end of directory in <%s>\n",
1724	parent->name );
1725	#endif
1726	*inode = NULL;
1727	return 1;
1728	}
1729	else // found searched name in parent directory
1730	{
1731	// allocate a new inode and an empty Cache-File
1732	*inode = _allocate_one_inode( name,
1733	is_dir,
1734	cluster,
1735	size,
1736	0, // count
1737	dentry,
1738	1 ); // cache_allocate
1739
1740	// introduce it in Inode-Tree
1741	_add_inode_in_tree( *inode , parent );
1742
1743	#if GIET_DEBUG_FAT
1744	if ( _get_proctime() > GIET_DEBUG_FAT )
1745	_printf("\n[DEBUG FAT] _get_child_from_parent(): found <%s> on device\n", name );
1746	#endif
1747	return 0;
1748	}
1749	} // end _get_child_from_parent()
1750
1751
1752
1753
1754	//////////////////////////////////////////////////////////////////
1755	static unsigned int _get_inode_from_path( char* pathname,
1756	fat_inode_t** inode )
1757	{
1758	char name[32]; // buffer for one name in pathname
1759	unsigned int nb_read; // number of characters written in name[]
1760	fat_inode_t* parent; // parent inode
1761	fat_inode_t* child; // child inode
1762	unsigned int last; // while exit condition
1763	unsigned int code; // return value
1764
1765	#if GIET_DEBUG_FAT
1766	if ( _get_proctime() > GIET_DEBUG_FAT )
1767	_printf("\n[DEBUG FAT] _get_inode_from_path(): enters for path <%s>\n", pathname );
1768	#endif
1769
1770	// handle root directory case
1771	if ( _strcmp( pathname , "/" ) == 0 )
1772	{
1773
1774	#if GIET_DEBUG_FAT
1775	if ( _get_proctime() > GIET_DEBUG_FAT )
1776	_printf("\n[DEBUG FAT] _get_inode_from_path(): found root inode for <%s>\n",
1777	pathname );
1778	#endif
1779	*inode = _fat.inode_tree_root;
1780	return 0;
1781	}
1782
1783	// If the pathname is not "/", we traverse the inode tree from the root.
1784	// We use _get_name_from_path() to scan pathname and extract inode names.
1785	// We use _get_child_from_parent() to scan each directory in the path.
1786
1787	last = 0;
1788	nb_read = 0; // number of characters analysed in path
1789	parent = _fat.inode_tree_root; // Inode-Tree root
1790
1791	while ( !last )
1792	{
1793	// get searched file/dir name
1794	if ( _get_name_from_path( pathname, name, &nb_read ) )
1795	{
1796	return 3; // error : name too long
1797	}
1798
1799	// compute last iteration condition
1800	last = (pathname[nb_read] == 0);
1801
1802	#if GIET_DEBUG_FAT
1803	if ( _get_proctime() > GIET_DEBUG_FAT )
1804	_printf("\n[DEBUG FAT] _get_inode_from_path(): got name <%s>\n", name );
1805	#endif
1806
1807	if ( _strcmp( name, ".." ) == 0)
1808	{
1809	// found special name "..", try to go up
1810	code = 0;
1811	if ( parent->parent )
1812	child = parent->parent;
1813	else
1814	child = parent;
1815	}
1816	else if ( _strcmp( name, "." ) == 0 )
1817	{
1818	// found special name ".", stay on the same level
1819	code = 0;
1820	child = parent;
1821	}
1822	else
1823	{
1824	// get child inode from parent directory
1825	code = _get_child_from_parent( parent,
1826	name,
1827	&child );
1828
1829	// we need to find the child inode for all non terminal names
1830	if ( (code == 2) \|\| ((code == 1 ) && !last) )
1831	{
1832
1833	#if GIET_DEBUG_FAT
1834	if ( _get_proctime() > GIET_DEBUG_FAT )
1835	_printf("\n[DEBUG FAT] _get_inode_from_path(): neither parent, nor child found for <%s>\n",
1836	pathname );
1837	#endif
1838	return 2; // error : parent inode not found
1839	}
1840	}
1841
1842	// update parent if not the last iteration
1843	if ( !last )
1844	parent = child;
1845	} // end while
1846
1847	// returns inode pointer
1848	if (code == 0 )
1849	{
1850
1851	#if GIET_DEBUG_FAT
1852	if ( _get_proctime() > GIET_DEBUG_FAT )
1853	_printf("\n[DEBUG FAT] _get_inode_from_path(): found inode for <%s>\n",
1854	pathname );
1855	#endif
1856	*inode = child;
1857	}
1858	else
1859	{
1860
1861	#if GIET_DEBUG_FAT
1862	if ( _get_proctime() > GIET_DEBUG_FAT )
1863	_printf("\n[DEBUG FAT] _get_inode_from_path(): found only parent inode for <%s>\n",
1864	pathname );
1865	#endif
1866	*inode = parent;
1867	}
1868
1869	return code; // can be 0 (found) or 1 (not found)
1870
1871	} // end _get_inode_from_path()
1872
1873
1874
1875
1876	//////////////////////////////////////////////////////////////
1877	static unsigned int _remove_node_from_fs( fat_inode_t* inode )
1878	{
1879	// check for root node
1880	if ( !inode->parent ) return 1;
1881
1882	// remove entry in parent directory
1883	if ( _remove_dir_entry( inode ) ) return 1;
1884
1885	// update parent directory on device
1886	if ( _update_device_from_cache( inode->parent->levels,
1887	inode->parent->cache,
1888	inode->parent->name ) ) return 1;
1889
1890	// release clusters allocated to file/dir in DATA region
1891	if ( _all_clusters_release( inode ) ) return 1;
1892
1893	// release File-Cache
1894	_release_cache_memory( inode->cache, inode->levels );
1895	_free ( inode->cache );
1896
1897	// remove inode from Inode-Tree
1898	_remove_inode_from_tree( inode );
1899
1900	// release inode
1901	_free ( inode );
1902
1903	return 0;
1904	} // end _remove_node_from_fs()
1905
1906
1907	//////////////////////////////////////////////////////////////////
1908	static unsigned int _next_cluster_no_cache( unsigned int cluster,
1909	unsigned int* next )
1910	{
1911	// compute cluster_id and slot_id
1912	// each cluster contains 1024 slots (4 bytes per slot)
1913	unsigned int cluster_id = cluster >> 10;
1914	unsigned int slot_id = cluster & 0x3FF;
1915
1916	// compute lba of cluster identified by cluster_id
1917	unsigned int lba = _fat.fat_lba + (cluster_id << 3);
1918
1919	// get cluster containing the adressed FAT slot in FAT buffer
1920	if ( _fat_buffer_fat_lba != lba )
1921	{
1922	if ( _fat_ioc_access( 0, // no descheduling
1923	1, // read
1924	lba,
1925	(unsigned int)_fat_buffer_fat,
1926	8 ) )
1927	{
1928	_printf("\n[FAT ERROR] _next_cluster_no_cache(): "
1929	"cannot load lba = %x into fat_buffer\n", lba );
1930	return 1;
1931	}
1932
1933	_fat_buffer_fat_lba = lba;
1934	}
1935
1936	// return next cluster index
1937	unsigned int* buf = (unsigned int*)_fat_buffer_fat;
1938	*next = buf[slot_id];
1939	return 0;
1940
1941	} // end _next_cluster_no_cache()
1942
1943
1944
1945
1946	/////////////////////////////////////////////////////////////////
1947	static unsigned int _file_info_no_cache( char* pathname,
1948	unsigned int* file_cluster,
1949	unsigned int* file_size )
1950	{
1951
1952	#if GIET_DEBUG_FAT
1953	if ( _get_proctime() > GIET_DEBUG_FAT )
1954	_printf("\n[DEBUG FAT] _file_info_no_cache(): enters for path <%s>\n", pathname );
1955	#endif
1956
1957	char name[32]; // buffer for one name in the analysed pathname
1958	char lfn1[16]; // buffer for a partial name in LFN entry
1959	char lfn2[16]; // buffer for a partial name in LFN entry
1960	char lfn3[16]; // buffer for a partial name in LFN entry
1961	char cname[32]; // buffer for a full name in a directory entry
1962	unsigned int nb_read; // number of characters analysed in path
1963	unsigned int parent_cluster; // cluster index for the parent directory
1964	unsigned int child_cluster = 0; // cluster index for the searched file/dir
1965	unsigned int child_size = 0; // size of the searched file/dir
1966	unsigned int child_is_dir; // type of the searched file/dir
1967	unsigned int offset; // offset in a 4 Kbytes buffer
1968	unsigned int ord; // ORD field in a directory entry
1969	unsigned int attr; // ATTR field in a directory entry
1970	unsigned int lfn = 0; // number of lfn entries
1971	unsigned char* buf; // pointer on a 4 Kbytes buffer
1972	unsigned int found; // name found in current directory entry
1973
1974	// Three embedded loops:
1975	// - scan pathname to extract file/dir names,
1976	// - for each name, scan the clusters of the parent directory
1977	// - for each cluster, scan the 4 Kbytes buffer to find the file/dir name
1978	// The starting point is the root directory (cluster 2)
1979
1980	nb_read = 0;
1981	parent_cluster = 2;
1982
1983	// scan pathname
1984	while ( pathname[nb_read] != 0 )
1985	{
1986	// get searched file/dir name
1987	if ( _get_name_from_path( pathname, name, &nb_read ) ) return 1;
1988
1989	#if GIET_DEBUG_FAT
1990	if ( _get_proctime() > GIET_DEBUG_FAT )
1991	_printf("\n[DEBUG FAT] _file_info_no_cache(): search name <%s>"
1992	" in cluster %x\n", name , parent_cluster );
1993	#endif
1994	found = 0;
1995
1996	// scan clusters containing the parent directory
1997	while ( found == 0 )
1998	{
1999	// compute lba
2000	unsigned int lba = _cluster_to_lba( parent_cluster );
2001
2002	// load one cluster of the parent directory into data_buffer
2003	if ( _fat_buffer_data_lba != lba )
2004	{
2005	if ( _fat_ioc_access( 0, // no descheduling
2006	1, // read
2007	lba,
2008	(unsigned int)_fat_buffer_data,
2009	8 ) )
2010	{
2011	_printf("\n[FAT ERROR] _file_info_no_cache(): "
2012	"cannot load lba = %x into data_buffer\n", lba );
2013	return 1;
2014	}
2015
2016	_fat_buffer_data_lba = lba;
2017	}
2018
2019	offset = 0;
2020
2021	// scan this 4 Kbytes buffer
2022	while ( (offset < 4096) && (found == 0) )
2023	{
2024	buf = _fat_buffer_data + offset;
2025	attr = _read_entry( DIR_ATTR , buf , 0 );
2026	ord = _read_entry( LDIR_ORD , buf , 0 );
2027
2028	if (ord == NO_MORE_ENTRY) // no more entry => break
2029	{
2030	found = 2;
2031	}
2032	else if ( ord == FREE_ENTRY ) // free entry => skip
2033	{
2034	offset = offset + 32;
2035	}
2036	else if ( attr == ATTR_LONG_NAME_MASK ) // LFN entry => get partial name
2037	{
2038	unsigned int seq = ord & 0x3;
2039	lfn = (seq > lfn) ? seq : lfn;
2040	if ( seq == 1 ) _get_name_from_long( buf, lfn1 );
2041	else if ( seq == 2 ) _get_name_from_long( buf, lfn2 );
2042	else if ( seq == 3 ) _get_name_from_long( buf, lfn3 );
2043	offset = offset + 32;
2044	}
2045	else // NORMAL entry
2046	{
2047	// build the full mame for current directory entry
2048	if ( lfn == 0 )
2049	{
2050	_get_name_from_short( buf , cname );
2051	}
2052	else if ( lfn == 1 )
2053	{
2054	_strcpy( cname , lfn1 );
2055	}
2056	else if ( lfn == 2 )
2057	{
2058	_strcpy( cname , lfn1 );
2059	_strcpy( cname + 13 , lfn2 );
2060	}
2061	else if ( lfn == 3 )
2062	{
2063	_strcpy( cname , lfn1 );
2064	_strcpy( cname + 13 , lfn2 );
2065	_strcpy( cname + 26 , lfn3 );
2066	}
2067
2068	// test if extracted name == searched name
2069	if ( _strcmp( name , cname ) == 0 )
2070	{
2071	child_cluster = (_read_entry( DIR_FST_CLUS_HI , buf , 1 ) << 16) \|
2072	(_read_entry( DIR_FST_CLUS_LO , buf , 1 ) ) ;
2073	child_is_dir = ((attr & ATTR_DIRECTORY) == ATTR_DIRECTORY);
2074	child_size = _read_entry( DIR_FILE_SIZE , buf , 1 );
2075	found = 1;
2076	}
2077	offset = offset + 32;
2078	lfn = 0;
2079	}
2080	} // en loop on directory entries
2081
2082	// compute next cluster index
2083	unsigned int next;
2084	if ( _next_cluster_no_cache ( parent_cluster , &next ) ) return 1;
2085	parent_cluster = next;
2086	} // end loop on clusters
2087
2088	if ( found == 2 ) // found end of directory => error
2089	{
2090	_printf("\n[FAT ERROR] _file_info_no_cache(): <%s> not found\n",
2091	name );
2092	return 1;
2093	}
2094
2095	// check type
2096	if ( ((pathname[nb_read] == 0) && (child_is_dir != 0)) \|\|
2097	((pathname[nb_read] != 0) && (child_is_dir == 0)) )
2098	{
2099	_printf("\n[FAT ERROR] _file_info_no_cache(): illegal type for <%s>\n", name );
2100	return 1;
2101	}
2102
2103	// update parent_cluster for next name
2104	parent_cluster = child_cluster;
2105
2106	} // end loop on names
2107
2108	#if GIET_DEBUG_FAT
2109	if ( _get_proctime() > GIET_DEBUG_FAT )
2110	_printf("\n[DEBUG FAT] _file_info_no_cache(): success for <%s> / "
2111	"file_size = %x / file_cluster = %x\n", pathname, child_size, child_cluster );
2112	#endif
2113
2114	// return file cluster and size
2115	*file_size = child_size;
2116	*file_cluster = child_cluster;
2117	return 0;
2118
2119	} // end _file_info_no_cache()
2120
2121
2122
2123	/////////////////////////////
2124	unsigned int _set_fs_info()
2125	{
2126	// load FS_INFO sector into FAT buffer
2127	if ( _fat_ioc_access( 0, // no descheduling
2128	1, // read
2129	_fat.fs_info_lba, // lba
2130	(unsigned int)_fat.block_buffer,
2131	1 ) ) // one block
2132	{
2133	_printf("\n[FAT ERROR] _set_fs_info(): cannot load FS_INFO Sector\n");
2134	return 1;
2135	}
2136	_fat.block_buffer_lba = _fat.fs_info_lba;
2137
2138	// get general info from FAT descriptor
2139	unsigned int data_blocks = _fat.data_sectors;
2140
2141	// initialise <free_clusters_number> from FS-INFO sector
2142	unsigned int free_clusters = _read_entry( FS_FREE_CLUSTERS, _fat.block_buffer, 1);
2143	if ( free_clusters >= (data_blocks>>3) )
2144	{
2145	_printf("\n[FAT ERROR] _set_fs_info(): illegal FS_FREE_CLUSTERS in FS-INFO\n"
2146	" fs_free_clusters = %x / total_clusters = %x\n",
2147	free_clusters , (data_blocks>>3) );
2148	return 1;
2149	}
2150
2151	_fat.free_clusters_number = free_clusters;
2152
2153	// initialise <free_cluster_hint> from FS_INFO sector
2154	unsigned int free_cluster_hint = _read_entry( FS_FREE_CLUSTER_HINT, _fat.block_buffer, 1);
2155	if ( free_cluster_hint > (data_blocks>>3) )
2156	{
2157	_printf("\n[FAT ERROR] _set_fs_info(): illegal FS_FREE_CLUSTER_HINT in FS-INFO\n"
2158	" fs_free_cluster_hint = %x / total_clusters = %x\n",
2159	free_cluster_hint , (data_blocks>>3) );
2160	return 1;
2161	}
2162
2163	_fat.free_cluster_hint = free_cluster_hint;
2164
2165	#if GIET_DEBUG_FAT
2166	if ( _get_proctime() > GIET_DEBUG_FAT )
2167	_printf("\n[DEBUG FAT] _set_fs_info() : free_clusters = %x / free_cluster_hint = %x\n",
2168	free_clusters , free_cluster_hint );
2169	#endif
2170
2171	return 0;
2172
2173	} // end _set_fs_info()
2174
2175
2176
2177
2178	/////////////////////////////////////
2179	static unsigned int _update_fs_info()
2180	{
2181	// load buffer if miss
2182	if ( _fat.fs_info_lba != _fat.block_buffer_lba )
2183	{
2184	if ( _fat_ioc_access( 1, // descheduling
2185	1, // read
2186	_fat.fs_info_lba,
2187	(unsigned int)_fat.block_buffer,
2188	1 ) ) // one block
2189	{
2190	_printf("\n[FAT_ERROR] _update_fs_info(): cannot read block\n");
2191	return 1;
2192	}
2193	_fat.block_buffer_lba = _fat.fs_info_lba;
2194	}
2195
2196	// update buffer
2197	unsigned int* ptr;
2198
2199	ptr = (unsigned int*)(_fat.block_buffer + get_offset(FS_FREE_CLUSTERS) );
2200	*ptr = _fat.free_clusters_number;
2201
2202	ptr = (unsigned int*)(_fat.block_buffer + get_offset(FS_FREE_CLUSTER_HINT) );
2203	*ptr = _fat.free_cluster_hint;
2204
2205	// write bloc to FAT
2206	if ( _fat_ioc_access( 1, // descheduling
2207	0, // write
2208	_fat.fs_info_lba,
2209	(unsigned int)_fat.block_buffer,
2210	1 ) ) // one block
2211	{
2212	_printf("\n[FAT_ERROR] _update_fs_info(): cannot write block\n");
2213	return 1;
2214	}
2215
2216	#if GIET_DEBUG_FAT
2217	if ( _get_proctime() > GIET_DEBUG_FAT )
2218	_printf("\n[DEBUG FAT] _update_fs_info() : free_clusters = %x / free_cluster_hint = %x\n",
2219	_fat.free_clusters_number , _fat.free_cluster_hint );
2220	#endif
2221
2222	return 0;
2223	} // end _update_fs_info()
2224
2225
2226
2227	///////////////////////////////////////////////////////////////////////////////
2228	///////////////////////////////////////////////////////////////////////////////
2229	// Extern functions
2230	///////////////////////////////////////////////////////////////////////////////
2231	///////////////////////////////////////////////////////////////////////////////
2232
2233	/////////////////////////////////////////////////////////////////////////////
2234	int _fat_ioc_access( unsigned int use_irq, // descheduling if non zero
2235	unsigned int to_mem, // read / write
2236	unsigned int lba, // first sector on device
2237	unsigned int buf_vaddr, // memory buffer vaddr
2238	unsigned int count ) // number of sectors
2239	{
2240	// compute memory buffer physical address
2241	unsigned int flags; // for _v2p_translate
2242	unsigned long long buf_paddr; // buffer physical address
2243
2244	if ( ((_get_mmu_mode() & 0x4) == 0 ) \|\| USE_IOC_RDK ) // identity
2245	{
2246	buf_paddr = (unsigned long long)buf_vaddr;
2247	}
2248	else // V2P translation required
2249	{
2250	buf_paddr = _v2p_translate( buf_vaddr , &flags );
2251	}
2252
2253	#if (GIET_DEBUG_FAT & 1)
2254	if ( _get_proctime() > GIET_DEBUG_FAT )
2255	_printf("\n[DEBUG FAT] _fat_ioc_access(): enters at cycle %d\n"
2256	" to_mem = %d / vaddr = %x / paddr = %l / sectors = %d / lba = %x\n",
2257	_get_proctime(), to_mem, buf_vaddr, buf_paddr, count, lba );
2258	#endif
2259
2260
2261	#if GIET_NO_HARD_CC // L1 cache inval (virtual addresses)
2262	if ( to_mem ) _dcache_buf_invalidate( buf_vaddr, count<<9 );
2263	#endif
2264
2265
2266	#if ( USE_IOC_BDV ) // call the proper driver
2267	return( _bdv_access( use_irq , to_mem , lba , buf_paddr , count ) );
2268	#elif ( USE_IOC_HBA )
2269	return( _hba_access( use_irq , to_mem , lba , buf_paddr , count ) );
2270	#elif ( USE_IOC_SDC )
2271	return( _sdc_access( use_irq , to_mem , lba , buf_paddr , count ) );
2272	#elif ( USE_IOC_SPI )
2273	return( _spi_access( use_irq , to_mem , lba , buf_paddr , count ) );
2274	#elif ( USE_IOC_RDK )
2275	return( _rdk_access( use_irq , to_mem , lba , buf_paddr , count ) );
2276	#else
2277	_printf("\n[FAT ERROR] _fat_ioc_access(): no IOC driver\n");
2278	_exit();
2279	#endif
2280
2281	} // end _fat_ioc_access()
2282
2283
2284
2285	/////////////////////////////////////////
2286	int _fat_init( unsigned int kernel_mode )
2287	{
2288
2289	#if GIET_DEBUG_FAT
2290	if ( _get_proctime() > GIET_DEBUG_FAT )
2291	_printf("\n[DEBUG FAT] _fat_init(): enters at cycle %d\n", _get_proctime() );
2292	#endif
2293
2294	// FAT initialisation should be done only once
2295	if ( _fat.initialized == FAT_INITIALIZED )
2296	{
2297	_printf("\n[FAT WARNING] _fat_init(): FAT already initialized\n");
2298	return GIET_FAT32_OK;
2299	}
2300
2301	// load Boot sector (VBR) into FAT buffer
2302	if ( _fat_ioc_access( 0, // no descheduling
2303	1, // read
2304	0, // block index
2305	(unsigned int)_fat.block_buffer,
2306	1 ) ) // one block
2307	{
2308	_printf("\n[FAT ERROR] _fat_init(): cannot load VBR\n");
2309	return GIET_FAT32_IO_ERROR;
2310	}
2311
2312	_fat.block_buffer_lba = 0;
2313
2314	#if GIET_DEBUG_FAT
2315	if ( _get_proctime() > GIET_DEBUG_FAT )
2316	{
2317	_printf("\n[DEBUG FAT] _fat_init(): Boot sector loaded\n");
2318	}
2319	#endif
2320
2321	// checking various FAT32 assuptions from boot sector
2322	if( _read_entry( BPB_BYTSPERSEC, _fat.block_buffer, 1 ) != 512 )
2323	{
2324	_printf("\n[FAT ERROR] _fat_init(): The sector size must be 512 bytes\n");
2325	return GIET_FAT32_INVALID_BOOT_SECTOR;
2326	}
2327	if( _read_entry( BPB_SECPERCLUS, _fat.block_buffer, 1 ) != 8 )
2328	{
2329	_printf("\n[FAT ERROR] _fat_init(): The cluster size must be 8 blocks\n");
2330	return GIET_FAT32_INVALID_BOOT_SECTOR;
2331	}
2332	if( _read_entry( BPB_NUMFATS, _fat.block_buffer, 1 ) != 1 )
2333	{
2334	_printf("\n[FAT ERROR] _fat_init(): The number of FAT copies in FAT region must be 1\n");
2335	return GIET_FAT32_INVALID_BOOT_SECTOR;
2336	}
2337	if( (_read_entry( BPB_FAT32_FATSZ32, _fat.block_buffer, 1 ) & 0xF) != 0 )
2338	{
2339	_printf("\n[FAT ERROR] _fat_init(): The FAT region must be multiple of 16 sectors\n");
2340	return GIET_FAT32_INVALID_BOOT_SECTOR;
2341	}
2342	if( _read_entry( BPB_FAT32_ROOTCLUS, _fat.block_buffer, 1 ) != 2 )
2343	{
2344	_printf("\n[FAT ERROR] _fat_init(): The root directory must be at cluster 2\n");
2345	return GIET_FAT32_INVALID_BOOT_SECTOR;
2346	}
2347
2348	// initialise Fat-Descriptor from VBR
2349	_fat.sector_size = 512;
2350	_fat.cluster_size = 4096;
2351	_fat.fat_sectors = _read_entry( BPB_FAT32_FATSZ32 , _fat.block_buffer , 1 );
2352	_fat.fat_lba = _read_entry( BPB_RSVDSECCNT , _fat.block_buffer , 1 );
2353	_fat.data_sectors = _fat.fat_sectors << 10;
2354	_fat.data_lba = _fat.fat_lba + _fat.fat_sectors;
2355	_fat.fs_info_lba = _read_entry( BPB_FAT32_FSINFO , _fat.block_buffer , 1 );
2356	_fat_buffer_fat_lba = 0xFFFFFFFF;
2357	_fat_buffer_data_lba = 0xFFFFFFFF;
2358	_fat.initialized = FAT_INITIALIZED;
2359
2360	/////////////////////////////////////////////////////////////////////
2361	// This is done only when the _fat_init() is called in kernel mode
2362
2363	if ( kernel_mode )
2364	{
2365	// initialise <free_clusters_number> and <first_free_cluster in FAT descriptor
2366	if ( _set_fs_info() ) return GIET_FAT32_IO_ERROR;
2367
2368	// create Inode-Tree root
2369	_fat.inode_tree_root = _allocate_one_inode("/", // dir name
2370	1, // is directory
2371	2, // cluster index
2372	4096, // at least one buffer
2373	0, // no children
2374	0, // no dentry
2375	1); // allocate cache
2376
2377	// initialize lock
2378	_spin_lock_init( &_fat.fat_lock );
2379
2380	// initialize File Descriptor Array
2381	unsigned int i;
2382	for( i = 0 ; i < GIET_OPEN_FILES_MAX ; i++ ) _fat.fd[i].allocated = 0;
2383
2384	// initialize fat_cache root
2385	_fat.fat_cache_root = _allocate_one_cache_node( NULL );
2386	_fat.fat_cache_levels = _get_levels_from_size( _fat.fat_sectors << 9 );
2387	} // end if kernel_mode
2388
2389	#if GIET_DEBUG_FAT
2390	if ( _get_proctime() > GIET_DEBUG_FAT )
2391	_display_fat_descriptor();
2392	#endif
2393
2394	return GIET_FAT32_OK;
2395	} // end _fat_init()
2396
2397
2398
2399
2400	////////////////////////////////////////////////////////////////////
2401	int _fat_open( char* pathname, // absolute path from root
2402	unsigned int flags ) // O_CREAT / O_RDONLY / O_TRUNC
2403	{
2404	unsigned int fd_id; // index in File-Descriptor-Array
2405	unsigned int code; // error code
2406	fat_inode_t* inode; // anonymous inode pointer
2407	fat_inode_t* child; // pointer on searched file inode
2408	fat_inode_t* parent; // pointer on parent directory inode
2409
2410	// get flags
2411	unsigned int create = ((flags & O_CREAT) != 0);
2412	unsigned int read_only = ((flags & O_RDONLY) != 0);
2413	unsigned int write_only = ((flags & O_WRONLY) != 0);
2414	unsigned int truncate = ((flags & O_TRUNC) != 0);
2415	unsigned int append = ((flags & O_APPEND) != 0);
2416
2417	#if GIET_DEBUG_FAT
2418	unsigned int procid = _get_procid();
2419	unsigned int x = procid >> (Y_WIDTH + P_WIDTH);
2420	unsigned int y = (procid >> P_WIDTH) & ((1 << Y_WIDTH) - 1);
2421	unsigned int p = procid & ((1 << P_WIDTH) - 1);
2422	if ( _get_proctime() > GIET_DEBUG_FAT )
2423	_printf("\n[DEBUG FAT] _fat_open(): P[%d,%d,%d] enters for path <%s>\n"
2424	" create = %d / read_only = %d / truncate = %d\n",
2425	x, y, p, pathname , create , read_only , truncate );
2426	#endif
2427
2428	// checking FAT initialized
2429	if ( _fat.initialized != FAT_INITIALIZED )
2430	{
2431	_printf("\n[FAT ERROR] _fat_open(): FAT not initialized\n");
2432	return GIET_FAT32_NOT_INITIALIZED;
2433	}
2434
2435	// takes the FAT lock and register it in thread context
2436	static_scheduler_t* psched = _get_sched();
2437	unsigned int ltid = _get_thread_ltid();
2438	_spin_lock_acquire( &_fat.fat_lock );
2439	_atomic_or( &psched->context[ltid].slot[CTX_LOCKS_ID] , LOCKS_MASK_FAT );
2440
2441	// get inode pointer
2442	code = _get_inode_from_path( pathname , &inode );
2443
2444	if ( code == 2 ) // parent inode not found
2445	{
2446	_spin_lock_release( &_fat.fat_lock );
2447	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2448
2449	_printf("\n[FAT ERROR] _fat_open(): path to parent not found"
2450	" for file <%s>\n", pathname );
2451	return GIET_FAT32_FILE_NOT_FOUND;
2452	}
2453	else if ( code == 3 ) // illegal path name
2454	{
2455	_spin_lock_release( &_fat.fat_lock );
2456	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2457
2458	_printf("\n[FAT ERROR] _fat_open(): one name in path too long"
2459	" for file <%s>\n", pathname );
2460	return GIET_FAT32_NAME_TOO_LONG;
2461	}
2462	else if ( (code == 1) && (create == 0) ) // child inode not found
2463	{
2464	_spin_lock_release( &_fat.fat_lock );
2465	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2466
2467	_printf("\n[FAT ERROR] _fat_open(): file not found"
2468	" for file <%s>\n", pathname );
2469	return GIET_FAT32_FILE_NOT_FOUND;
2470	}
2471	else if ( (code == 1) && (create != 0) ) // child inode not found => create
2472	{
2473	// set parent inode pointer
2474	parent = inode;
2475
2476	#if GIET_DEBUG_FAT
2477	if ( _get_proctime() > GIET_DEBUG_FAT )
2478	_printf("\n[DEBUG FAT] _fat_open(): P[%d,%d,%d] create a new file <%s>\n",
2479	x , y , p , pathname );
2480	#endif
2481
2482	// get new file name / error check already done by _get_inode_from_path()
2483	char name[32];
2484	_get_last_name( pathname , name );
2485
2486	// allocate a new inode and an empty Cache-File
2487	child = _allocate_one_inode( name,
2488	0, // not a directory
2489	END_OF_CHAIN_CLUSTER_MAX, // no cluster allocated
2490	0, // size : new file is empty
2491	0, // count incremented later
2492	0, // set by add_dir_entry
2493	1 ); // cache_allocate
2494
2495	// introduce inode into Inode-Tree
2496	_add_inode_in_tree( child , parent );
2497
2498	// add an entry in the parent directory Cache_file
2499	// and update the dentry field in child inode
2500	if ( _add_dir_entry( child ) )
2501	{
2502	_spin_lock_release( &_fat.fat_lock );
2503	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2504
2505	_printf("\n[FAT ERROR] _fat_open(): cannot update parent directory"
2506	" for file <%s>\n" , pathname );
2507	return GIET_FAT32_IO_ERROR;
2508	}
2509
2510	// update DATA region on block device for parent directory
2511	if ( _update_device_from_cache( parent->levels,
2512	parent->cache,
2513	parent->name ) )
2514	{
2515	_spin_lock_release( &_fat.fat_lock );
2516	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2517
2518	_printf("\n[FAT ERROR] _fat_open(): cannot update DATA region "
2519	" for parent of file <%s>\n", pathname );
2520	return GIET_FAT32_IO_ERROR;
2521	}
2522
2523	// update FAT region on block device
2524	if ( _update_device_from_cache( _fat.fat_cache_levels,
2525	_fat.fat_cache_root,
2526	"FAT" ) )
2527	{
2528	_spin_lock_release( &_fat.fat_lock );
2529	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2530
2531	_printf("\n[FAT ERROR] _fat_open(): cannot update FAT region"
2532	" for file <%s>\n", pathname );
2533	return GIET_FAT32_IO_ERROR;
2534	}
2535
2536	// no need to truncate a new file
2537	truncate = 0;
2538
2539	#if GIET_DEBUG_FAT
2540	if ( _get_proctime() > GIET_DEBUG_FAT )
2541	{
2542	_printf("\n[DEBUG FAT] _fat_open() : new inode created for <%s>\n"
2543	" size = %x / cluster = %x / cache = %x",
2544	child->name , child->size , child->cluster , child->cache );
2545	if ( child->cache != NULL )
2546	{
2547	_printf(" / pdesc[0] = %x\n", (unsigned int)(child->cache->children[0]) );
2548	}
2549	else
2550	{
2551	_printf("\n");
2552	}
2553	}
2554	#endif
2555
2556	}
2557	else // inode found
2558	{
2559	// set searched file inode pointer
2560	child = inode;
2561
2562	#if GIET_DEBUG_FAT
2563	if ( _get_proctime() > GIET_DEBUG_FAT )
2564	{
2565	_printf("\n[DEBUG FAT] _fat_open(): P[%d,%d,%d] found file <%s>\n"
2566	" inode = %x / size = %x\n",
2567	x , y , p , pathname , (unsigned int)child , child->size );
2568
2569	_display_clusters_list( child );
2570	}
2571	#endif
2572
2573	}
2574
2575	// Search an empty slot in file descriptors array
2576	fd_id = 0;
2577	while ( (_fat.fd[fd_id].allocated) != 0 && (fd_id < GIET_OPEN_FILES_MAX) )
2578	{
2579	fd_id++;
2580	}
2581
2582	// check if an empty slot has been found
2583	if ( fd_id >= GIET_OPEN_FILES_MAX )
2584	{
2585	_spin_lock_release( &_fat.fat_lock );
2586	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2587
2588	_printf("\n[FAT ERROR] _fat_open(): File-Descriptors-Array full\n");
2589	return GIET_FAT32_TOO_MANY_OPEN_FILES;
2590	}
2591
2592	// truncate the file if requested
2593	if ( truncate && !read_only && !child->is_dir && child->size != 0 )
2594	{
2595	// release File-Cache (keep root node)
2596	_release_cache_memory( child->cache, child->levels );
2597
2598	// release clusters allocated to file/dir in DATA region
2599	if ( _all_clusters_release( child ) )
2600	{
2601	_spin_lock_release( &_fat.fat_lock );
2602	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2603
2604	_printf("\n[FAT ERROR] _fat_open(): can't truncate file\n");
2605	return GIET_FAT32_IO_ERROR;
2606	}
2607
2608	// update parent directory entry (size and cluster index)
2609	if ( _update_dir_entry( child ) )
2610	{
2611	_spin_lock_release( &_fat.fat_lock );
2612	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2613
2614	_printf("\n[FAT ERROR] _fat_open(): can't truncate file\n");
2615	return GIET_FAT32_IO_ERROR;
2616	}
2617
2618	// update inode
2619	child->size = 0;
2620	child->levels = 1;
2621	}
2622
2623	// update file descriptor
2624	_fat.fd[fd_id].allocated = 1;
2625	_fat.fd[fd_id].read_only = read_only;
2626	_fat.fd[fd_id].write_only = write_only;
2627	_fat.fd[fd_id].inode = child;
2628	_fat.fd[fd_id].seek = ( append ) ? child->size : 0;
2629
2630	// increment the refcount
2631	child->count = child->count + 1;
2632
2633	#if GIET_DEBUG_FAT
2634	if ( _get_proctime() > GIET_DEBUG_FAT )
2635	_printf("\n[DEBUG FAT] _fat_open(): P[%d,%d,%d] get fd = %d for <%s>\n"
2636	" inode = %x / offset = %x / read_only = %d / size = %x / cluster = %x\n",
2637	x , y , p , fd_id , pathname ,
2638	(unsigned int)_fat.fd[fd_id].inode,
2639	_fat.fd[fd_id].seek,
2640	_fat.fd[fd_id].read_only,
2641	_fat.fd[fd_id].inode->size,
2642	_fat.fd[fd_id].inode->cluster );
2643	#endif
2644
2645	// releases the lock
2646	_spin_lock_release( &_fat.fat_lock );
2647	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2648
2649	return fd_id;
2650	} // end _fat_open()
2651
2652
2653
2654
2655	////////////////////////////////////
2656	int _fat_close( unsigned int fd_id )
2657	{
2658	// checking FAT initialized
2659	if( _fat.initialized != FAT_INITIALIZED )
2660	{
2661	_printf("\n[FAT ERROR] _fat_close(): FAT not initialized\n");
2662	return GIET_FAT32_NOT_INITIALIZED;
2663	}
2664
2665	if( (fd_id >= GIET_OPEN_FILES_MAX) )
2666	{
2667	_printf("\n[FAT ERROR] _fat_close(): illegal file descriptor index\n");
2668	return GIET_FAT32_INVALID_FD;
2669	}
2670
2671	// takes the FAT lock and register it in thread context
2672	static_scheduler_t* psched = _get_sched();
2673	unsigned int ltid = _get_thread_ltid();
2674	_spin_lock_acquire( &_fat.fat_lock );
2675	_atomic_or( &psched->context[ltid].slot[CTX_LOCKS_ID] , LOCKS_MASK_FAT );
2676
2677	if( _fat.fd[fd_id].allocated == 0 )
2678	{
2679	_spin_lock_release( &_fat.fat_lock );
2680	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2681
2682	_printf("\n[FAT ERROR] _fat_close(): file not open\n");
2683	return GIET_FAT32_NOT_OPEN;
2684	}
2685
2686	// get the inode pointer
2687	fat_inode_t* inode = _fat.fd[fd_id].inode;
2688
2689	#if GIET_DEBUG_FAT
2690	if ( _get_proctime() > GIET_DEBUG_FAT )
2691	_printf("\n[FAT DEBUG] _fat_close() for file <%s> : refcount = %d"
2692	" / size = %x / cluster = %x\n",
2693	inode->name , inode->count , inode->size , inode->cluster );
2694	#endif
2695
2696	// decrement reference count
2697	inode->count = inode->count - 1;
2698
2699	// update block device and release File-Cache if no more references
2700	if ( inode->count == 0 )
2701	{
2702	// update all dirty clusters for closed file
2703	if ( _update_device_from_cache( inode->levels,
2704	inode->cache,
2705	inode->name ) )
2706	{
2707	_spin_lock_release( &_fat.fat_lock );
2708	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2709
2710	_printf("\n[FAT ERROR] _fat_close(): cannot write dirty clusters "
2711	"for file <%s>\n", inode->name );
2712	return GIET_FAT32_IO_ERROR;
2713	}
2714
2715	#if GIET_DEBUG_FAT
2716	if ( _get_proctime() > GIET_DEBUG_FAT )
2717	_printf("\n[FAT DEBUG] _fat_close() updated device for file <%s>\n", inode->name );
2718	#endif
2719
2720	// update dirty clusters for parent directory
2721	if ( inode->parent &&
2722	_update_device_from_cache( inode->parent->levels,
2723	inode->parent->cache,
2724	inode->parent->name ) )
2725	{
2726	_spin_lock_release( &_fat.fat_lock );
2727	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2728
2729	_printf("\n[FAT ERROR] _fat_close(): cannot write dirty clusters "
2730	"for directory <%s>\n", inode->parent->name );
2731	return GIET_FAT32_IO_ERROR;
2732	}
2733
2734	#if GIET_DEBUG_FAT
2735	if ( _get_proctime() > GIET_DEBUG_FAT )
2736	_printf("\n[FAT DEBUG] _fat_close() updated device for parent directory <%s>\n",
2737	inode->parent->name );
2738	#endif
2739
2740	// release memory allocated to File-Cache (keep cache root node)
2741	_release_cache_memory( inode->cache, inode->levels );
2742
2743	#if GIET_DEBUG_FAT
2744	if ( _get_proctime() > GIET_DEBUG_FAT )
2745	_printf("\n[FAT DEBUG] _fat_close() release memory for File-Cache <%s>\n",
2746	inode->name );
2747	#endif
2748
2749	} // end if (refcount == 0)
2750
2751
2752	// release fd_id entry in file descriptor array
2753	_fat.fd[fd_id].allocated = 0;
2754
2755	// release lock
2756	_spin_lock_release( &_fat.fat_lock );
2757	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2758
2759	return GIET_FAT32_OK;
2760	} // end fat_close()
2761
2762
2763
2764
2765	////////////////////////////////////////////
2766	int _fat_file_info( unsigned int fd_id,
2767	fat_file_info_t* info )
2768	{
2769	if ( _fat.initialized != FAT_INITIALIZED )
2770	{
2771	_printf("\n[FAT ERROR] _fat_file_info(): FAT not initialized\n");
2772	return GIET_FAT32_NOT_INITIALIZED;
2773	}
2774
2775	if ( fd_id >= GIET_OPEN_FILES_MAX )
2776	{
2777	_printf("\n[FAT ERROR] _fat_file_info(): illegal file descriptor index\n");
2778	return GIET_FAT32_INVALID_FD;
2779	}
2780
2781	if ( _fat.fd[fd_id].allocated == 0 )
2782	{
2783	_printf("\n[FAT ERROR] _fat_file_info(): file not open\n");
2784	return GIET_FAT32_NOT_OPEN;
2785	}
2786
2787	info->size = _fat.fd[fd_id].inode->size;
2788	info->offset = _fat.fd[fd_id].seek;
2789	info->is_dir = _fat.fd[fd_id].inode->is_dir;
2790
2791	return GIET_FAT32_OK;
2792	} // end _fat_file_info()
2793
2794
2795
2796
2797	/////////////////////////////////////////////////////////////////////
2798	int _fat_read( unsigned int fd_id, // file descriptor index
2799	unsigned int vaddr, // destination buffer vaddr
2800	unsigned int count, // number of bytes to read
2801	unsigned int extend, // physical address extension
2802	unsigned int offset, // forced file offset
2803	unsigned int modes ) // special modes
2804	{
2805
2806	#if GIET_DEBUG_FAT
2807	unsigned int procid = _get_procid();
2808	unsigned int x = procid >> (Y_WIDTH + P_WIDTH);
2809	unsigned int y = (procid >> P_WIDTH) & ((1<<Y_WIDTH)-1);
2810	unsigned int p = procid & ((1<<P_WIDTH)-1);
2811	if ( _get_proctime() > GIET_DEBUG_FAT )
2812	_printf("\n[DEBUG FAT] _fat_read(): P[%d,%d,%d] enters at cycle %d\n"
2813	" fd = %d / vaddr = %x / bytes = %x / extend = %x / forced_offset = %x\n",
2814	x , y , p , _get_proctime(),
2815	fd_id , vaddr , count , extend , offset );
2816	#endif
2817
2818	// checking FAT initialized
2819	if( _fat.initialized != FAT_INITIALIZED )
2820	{
2821	_printf("\n[FAT ERROR] in _fat_read(): FAT not initialized\n");
2822	return GIET_FAT32_NOT_INITIALIZED;
2823	}
2824
2825	// takes the FAT lock and register it in thread context
2826	static_scheduler_t* psched = _get_sched();
2827	unsigned int ltid = _get_thread_ltid();
2828	_spin_lock_acquire( &_fat.fat_lock );
2829	_atomic_or( &psched->context[ltid].slot[CTX_LOCKS_ID] , LOCKS_MASK_FAT );
2830
2831	// check fd_id overflow
2832	if ( fd_id >= GIET_OPEN_FILES_MAX )
2833	{
2834	_spin_lock_release( &_fat.fat_lock );
2835	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2836
2837	_printf("\n[FAT ERROR] in _fat_read(): illegal file descriptor\n");
2838	return GIET_FAT32_INVALID_FD;
2839	}
2840
2841	// check file open
2842	if ( _fat.fd[fd_id].allocated == 0 )
2843	{
2844	_spin_lock_release( &_fat.fat_lock );
2845	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2846
2847	_printf("\n[FAT ERROR] in _fat_read(): file not open\n");
2848	return GIET_FAT32_NOT_OPEN;
2849	}
2850
2851	// check file readable
2852	if ( _fat.fd[fd_id].write_only )
2853	{
2854	_spin_lock_release( &_fat.fat_lock );
2855	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2856
2857	_printf("\n[FAT ERROR] _fat_read(): file <%s> is write-only\n",
2858	_fat.fd[fd_id].inode->name );
2859	return GIET_FAT32_WRITE_ONLY;
2860	}
2861
2862	// get special modes
2863	unsigned int physical_addressing = modes & FAT_PADDR_MODE;
2864	unsigned int forced_offset = modes & FAT_FORCED_OFFSET;
2865
2866	// get file inode pointer and offset
2867	fat_inode_t* inode = _fat.fd[fd_id].inode;
2868	unsigned int seek = forced_offset ? offset : _fat.fd[fd_id].seek;
2869
2870	// check seek versus file size
2871	if ( (seek >= inode->size) && !inode->is_dir )
2872	{
2873	_spin_lock_release( &_fat.fat_lock );
2874	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2875
2876	_printf("\n[FAT ERROR] in _fat_read(): offset larger than file size"
2877	" / seek = %x / file_size = %x\n",
2878	seek , inode->size );
2879	return GIET_FAT32_IO_ERROR;
2880	}
2881
2882	// check and ajust count argument for a file
2883	if ( (count > (inode->size - seek)) && !inode->is_dir ) count = inode->size - seek;
2884
2885	// compute first_cluster_id and first_byte_to_move
2886	unsigned int first_cluster_id = seek >> 12;
2887	unsigned int first_byte_to_move = seek & 0xFFF;
2888
2889	// compute last_cluster and last_byte_to_move
2890	unsigned int last_cluster_id = (seek + count - 1) >> 12;
2891	unsigned int last_byte_to_move = (seek + count - 1) & 0xFFF;
2892
2893	#if GIET_DEBUG_FAT
2894	if ( _get_proctime() > GIET_DEBUG_FAT )
2895	_printf("\n[DEBUG FAT] _fat_read(): P[%d,%d,%d] search file <%s> with seek = %x\n "
2896	" first_cluster_id = %x / first_byte_to_move = %x"
2897	" / last_cluster_id = %x / last_byte_to_move = %x\n",
2898	x , y , p , inode->name , seek ,
2899	first_cluster_id , first_byte_to_move , last_cluster_id , last_byte_to_move );
2900	#endif
2901
2902	// loop on all cluster covering the requested transfer
2903	unsigned int cluster_id;
2904	unsigned int done = 0;
2905	for ( cluster_id = first_cluster_id ; cluster_id <= last_cluster_id ; cluster_id++ )
2906	{
2907	// get pointer on the cluster_id buffer in cache
2908	unsigned char* cbuf;
2909	fat_cache_desc_t* pdesc;
2910	if ( _get_file_cache_buffer( inode,
2911	cluster_id,
2912	0,
2913	&pdesc ) )
2914	{
2915	_spin_lock_release( &_fat.fat_lock );
2916	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2917
2918	_printf("\n[FAT ERROR] in _fat_read(): cannot load file <%s>\n",
2919	inode->name );
2920	return GIET_FAT32_IO_ERROR;
2921	}
2922	cbuf = pdesc->buffer;
2923
2924	#if GIET_DEBUG_FAT
2925	if ( _get_proctime() > GIET_DEBUG_FAT )
2926	_printf("\n[DEBUG FAT] _fat_read(): P[%d,%d,%d] moves cluster_id %d from Cache-File <%s>\n",
2927	x , y , p , cluster_id, inode->name );
2928	#endif
2929
2930	// compute memcpy arguments
2931	unsigned char* source;
2932	unsigned int nbytes;
2933
2934	if ( (cluster_id == first_cluster_id) && (cluster_id == last_cluster_id) )
2935	{
2936	source = cbuf + first_byte_to_move;
2937	nbytes = last_byte_to_move - first_byte_to_move + 1;
2938	}
2939	else if ( cluster_id == first_cluster_id )
2940	{
2941	source = cbuf + first_byte_to_move;
2942	nbytes = 4096 - first_byte_to_move;
2943	}
2944	else if ( cluster_id == last_cluster_id )
2945	{
2946	source = cbuf;
2947	nbytes = last_byte_to_move + 1;
2948	}
2949	else // not first / not last
2950	{
2951	source = cbuf;
2952	nbytes = 4096;
2953	}
2954
2955	// move data
2956	if ( physical_addressing == 0 ) // no physical addressing
2957	{
2958	char* dest = (char*)(vaddr + done);
2959	memcpy( dest , source , nbytes );
2960	}
2961	else // physical addressing required
2962	{
2963	unsigned int flags;
2964	paddr_t pdest = (((paddr_t)extend)<<32) + vaddr + done;
2965	paddr_t psource = _v2p_translate( (unsigned int)source, &flags );
2966	_physical_memcpy( pdest , psource , nbytes );
2967	}
2968
2969	done = done + nbytes;
2970	}
2971
2972	#if GIET_DEBUG_FAT
2973	if ( _get_proctime() > GIET_DEBUG_FAT )
2974	_printf("\n[DEBUG FAT] _fat_read(): P[%d,%d,%d] loaded file <%s> from Cache-File\n",
2975	x , y , p , inode->name );
2976	#endif
2977
2978	// update seek if required
2979	if ( forced_offset == 0 ) _fat.fd[fd_id].seek += done;
2980
2981	// release lock
2982	_spin_lock_release( &_fat.fat_lock );
2983	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
2984
2985	return done;
2986	} // end _fat_read()
2987
2988
2989
2990
2991	////////////////////////////////////////////////////////////////
2992	int _fat_write( unsigned int fd_id, // file descriptor index
2993	unsigned int vaddr, // source buffer vaddr
2994	unsigned int count, // number of bytes to write
2995	unsigned int extend, // physical address extension
2996	unsigned int modes ) // special modes
2997	{
2998	// checking FAT initialized
2999	if( _fat.initialized != FAT_INITIALIZED )
3000	{
3001	_printf("\n[FAT ERROR] _fat_write(): FAT not initialized\n");
3002	return GIET_FAT32_NOT_INITIALIZED;
3003	}
3004
3005	// takes the FAT lock and register it in thread context
3006	static_scheduler_t* psched = _get_sched();
3007	unsigned int ltid = _get_thread_ltid();
3008	_spin_lock_acquire( &_fat.fat_lock );
3009	_atomic_or( &psched->context[ltid].slot[CTX_LOCKS_ID] , LOCKS_MASK_FAT );
3010
3011
3012	// check fd_id overflow
3013	if ( fd_id >= GIET_OPEN_FILES_MAX )
3014	{
3015	_spin_lock_release( &_fat.fat_lock );
3016	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3017
3018	_printf("\n[FAT ERROR] _fat_write(): illegal file descriptor\n");
3019	return GIET_FAT32_INVALID_FD;
3020	}
3021
3022	// check file open
3023	if ( _fat.fd[fd_id].allocated == 0 )
3024	{
3025	_spin_lock_release( &_fat.fat_lock );
3026	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3027
3028	_printf("\n[FAT ERROR] _fat_write(): file not open\n" );
3029	return GIET_FAT32_NOT_OPEN;
3030	}
3031
3032	// check file writable
3033	if ( _fat.fd[fd_id].read_only )
3034	{
3035	_spin_lock_release( &_fat.fat_lock );
3036	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3037
3038	_printf("\n[FAT ERROR] _fat_write(): file <%s> is read-only\n",
3039	_fat.fd[fd_id].inode->name );
3040	return GIET_FAT32_READ_ONLY;
3041	}
3042
3043	// get special modes
3044	unsigned int physical_addressing = modes & FAT_PADDR_MODE;
3045
3046	// get file inode pointer and seek
3047	fat_inode_t* inode = _fat.fd[fd_id].inode;
3048	unsigned int seek = _fat.fd[fd_id].seek;
3049
3050	#if GIET_DEBUG_FAT
3051	unsigned int procid = _get_procid();
3052	unsigned int x = procid >> (Y_WIDTH + P_WIDTH);
3053	unsigned int y = (procid >> P_WIDTH) & ((1<<Y_WIDTH)-1);
3054	unsigned int p = procid & ((1<<P_WIDTH)-1);
3055	if ( _get_proctime() > GIET_DEBUG_FAT )
3056	_printf("\n[DEBUG FAT] _fat_write(): P[%d,%d,%d] enters for file <%s> "
3057	" / bytes = %x / seek = %x\n",
3058	x , y , p , inode->name , count , seek );
3059	#endif
3060
3061	// check if file size must be incremented
3062	// and allocate new clusters from FAT if required
3063	unsigned int old_size = inode->size;
3064	unsigned int new_size = seek + count;
3065	if ( new_size > old_size )
3066	{
3067	// compute current and required numbers of clusters
3068	unsigned old_clusters = old_size >> 12;
3069	if ( old_size & 0xFFF ) old_clusters++;
3070
3071	unsigned new_clusters = new_size >> 12;
3072	if ( new_size & 0xFFF ) new_clusters++;
3073
3074	// allocate new clusters from FAT if required
3075	if ( new_clusters > old_clusters )
3076	{
3077
3078	#if GIET_DEBUG_FAT
3079	if ( _get_proctime() > GIET_DEBUG_FAT )
3080	_printf("\n[DEBUG FAT] _fat_write(): P[%d,%d,%d] allocates new clusters for file <%s>"
3081	" / current = %d / required = %d\n",
3082	x , y , p , inode->name , old_clusters , new_clusters );
3083	#endif
3084	// allocate missing clusters
3085	unsigned int cid;
3086	unsigned int index; // unused
3087	for ( cid = 0 ; cid < (new_clusters - old_clusters) ; cid++ )
3088	{
3089	if ( _one_cluster_allocate( inode , &index ) )
3090	{
3091	_spin_lock_release( &_fat.fat_lock );
3092	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] ,
3093	~LOCKS_MASK_FAT );
3094
3095	_printf("\n[FAT ERROR] in _fat_write(): no free cluster"
3096	" for file <%s>\n", _fat.fd[fd_id].inode->name );
3097	return GIET_FAT32_NO_FREE_SPACE;
3098	}
3099	}
3100	}
3101
3102	// update size in inode
3103	inode->size = new_size;
3104
3105	// update parent directory entry (size and cluster index)
3106	if ( _update_dir_entry( inode ) )
3107	{
3108	_spin_lock_release( &_fat.fat_lock );
3109	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3110
3111	_printf("\n[FAT ERROR] _fat_write(): cannot update parent directory entry"
3112	" for file <%s>\n", _fat.fd[fd_id].inode->name );
3113	return GIET_FAT32_IO_ERROR;
3114	}
3115
3116
3117	#if GIET_DEBUG_FAT
3118	if ( _get_proctime() > GIET_DEBUG_FAT )
3119	_printf("\n[DEBUG FAT] _fat_write(): P[%d,%d,%d] updates size for file <%s> / size = %x\n",
3120	x , y , p , inode->name , (new_size - old_size) );
3121	#endif
3122
3123	}
3124
3125	// compute first_cluster_id and first_byte_to_move
3126	unsigned int first_cluster_id = seek >> 12;
3127	unsigned int first_byte_to_move = seek & 0xFFF;
3128
3129	// compute last_cluster and last_byte_to_move
3130	unsigned int last_cluster_id = (seek + count - 1) >> 12;
3131	unsigned int last_byte_to_move = (seek + count - 1) & 0xFFF;
3132
3133	#if GIET_DEBUG_FAT
3134	if ( _get_proctime() > GIET_DEBUG_FAT )
3135	_printf("\n[DEBUG FAT] _fat_write(): P[%d,%d,%d] starts loop on clusters for file <%s>\n"
3136	" first_cluster_id = %d / first_byte_to_move = %x"
3137	" / last_cluster_id = %d / last_byte_to_move = %x\n",
3138	x , y , p , inode->name ,
3139	first_cluster_id , first_byte_to_move , last_cluster_id , last_byte_to_move );
3140	#endif
3141
3142	// loop on all clusters covering the requested transfer
3143	unsigned int cluster_id;
3144	unsigned int done = 0;
3145	for ( cluster_id = first_cluster_id ; cluster_id <= last_cluster_id ; cluster_id++ )
3146	{
3147	// get pointer on one 4K buffer in File-Cache
3148	unsigned char* cbuf;
3149	fat_cache_desc_t* pdesc;
3150	if ( _get_file_cache_buffer( inode,
3151	cluster_id,
3152	0,
3153	&pdesc ) )
3154	{
3155	_spin_lock_release( &_fat.fat_lock );
3156	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3157
3158	_printf("\n[FAT ERROR] _fat_write(): cannot load file <%s>\n",
3159	inode->name );
3160	return GIET_FAT32_IO_ERROR;
3161	}
3162
3163	cbuf = pdesc->buffer;
3164	pdesc->dirty = 1;
3165
3166	#if GIET_DEBUG_FAT
3167	if ( _get_proctime() > GIET_DEBUG_FAT )
3168	_printf("\n[DEBUG FAT] _fat_write(): P[%d,%d,%d] move cluster_id %d to Cache-file <%s>\n",
3169	x , y , p , cluster_id, inode->name );
3170	#endif
3171
3172	// compute memcpy arguments
3173	unsigned char* dest;
3174	unsigned int nbytes;
3175	if ( (cluster_id == first_cluster_id) && (cluster_id == last_cluster_id) )
3176	{
3177	dest = cbuf + first_byte_to_move;
3178	nbytes = last_byte_to_move - first_byte_to_move + 1;
3179	}
3180	else if ( cluster_id == first_cluster_id )
3181	{
3182	dest = cbuf + first_byte_to_move;
3183	nbytes = 4096 - first_byte_to_move;
3184	}
3185	else if ( cluster_id == last_cluster_id )
3186	{
3187	dest = cbuf;
3188	nbytes = last_byte_to_move + 1;
3189	}
3190	else
3191	{
3192	dest = cbuf;
3193	nbytes = 4096;
3194	}
3195
3196	// move data
3197	if ( physical_addressing == 0 ) // no physical addressing
3198	{
3199	char* source = (char*)(vaddr + done);
3200	memcpy( dest , source , nbytes );
3201	}
3202	else // physical addressing required
3203	{
3204	unsigned int flags;
3205	paddr_t psource = (((paddr_t)extend)<<32) + vaddr + done;
3206	paddr_t pdest = _v2p_translate( (unsigned int)dest , &flags );
3207	_physical_memcpy( pdest , psource , nbytes );
3208	}
3209
3210	done = done + nbytes;
3211
3212	} // end for clusters
3213
3214	// update seek
3215	_fat.fd[fd_id].seek += done;
3216
3217	#if GIET_DEBUG_FAT
3218	if ( _get_proctime() > GIET_DEBUG_FAT )
3219	_printf("\n[DEBUG FAT] _fat_write(): P[%d,%d,%d] store file <%s> into Cache-File\n",
3220	x , y , p , inode->name );
3221	#endif
3222
3223	// release lock
3224	_spin_lock_release( &_fat.fat_lock );
3225	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3226
3227	return done;
3228	} // end _fat_write()
3229
3230
3231
3232	///////////////////////////////////
3233	int _fat_lseek( unsigned int fd_id,
3234	unsigned int seek,
3235	unsigned int whence )
3236	{
3237	// checking FAT initialized
3238	if( _fat.initialized != FAT_INITIALIZED )
3239	{
3240	_printf("\n[FAT ERROR] _fat_lseek(): FAT not initialized\n");
3241	return GIET_FAT32_NOT_INITIALIZED;
3242	}
3243
3244	// check fd_id overflow
3245	if ( fd_id >= GIET_OPEN_FILES_MAX )
3246	{
3247	_printf("\n[FAT ERROR] _fat_lseek(): illegal file descriptor\n");
3248	return GIET_FAT32_INVALID_FD;
3249	}
3250
3251	// takes the FAT lock and register it in thread context
3252	static_scheduler_t* psched = _get_sched();
3253	unsigned int ltid = _get_thread_ltid();
3254	_spin_lock_acquire( &_fat.fat_lock );
3255	_atomic_or( &psched->context[ltid].slot[CTX_LOCKS_ID] , LOCKS_MASK_FAT );
3256
3257
3258	// check file open
3259	if ( _fat.fd[fd_id].allocated == 0 )
3260	{
3261	_spin_lock_release( &_fat.fat_lock );
3262	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3263
3264	_printf("\n[FAT ERROR] _fat_lseek(): file not open\n");
3265	return GIET_FAT32_NOT_OPEN;
3266	}
3267
3268	unsigned int new_seek;
3269
3270	// compute new seek
3271	if ( whence == SEEK_CUR ) new_seek = _fat.fd[fd_id].seek + seek;
3272	else if ( whence == SEEK_SET ) new_seek = seek;
3273	else if ( whence == SEEK_END ) new_seek = _fat.fd[fd_id].inode->size + seek;
3274	else
3275	{
3276	_spin_lock_release( &_fat.fat_lock );
3277	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3278
3279	_printf("\n[FAT ERROR] _fat_lseek(): illegal whence value\n");
3280	return GIET_FAT32_INVALID_ARG;
3281	}
3282
3283	// update file descriptor offset
3284	_fat.fd[fd_id].seek = new_seek;
3285
3286	#if GIET_DEBUG_FAT
3287	unsigned int procid = _get_procid();
3288	unsigned int x = procid >> (Y_WIDTH + P_WIDTH);
3289	unsigned int y = (procid >> P_WIDTH) & ((1<<Y_WIDTH)-1);
3290	unsigned int p = procid & ((1<<P_WIDTH)-1);
3291	if ( _get_proctime() > GIET_DEBUG_FAT )
3292	_printf("\n[DEBUG FAT] _fat_lseek(): P[%d,%d,%d] set seek = %x for file <%s>\n",
3293	x , y , p , new_seek , _fat.fd[fd_id].inode->name );
3294	#endif
3295
3296	// release lock
3297	_spin_lock_release( &_fat.fat_lock );
3298	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3299
3300	return new_seek;
3301	} // end _fat_lseek()
3302
3303
3304
3305	///////////////////////////////////////
3306	int _fat_remove( char* pathname,
3307	unsigned int should_be_dir )
3308	{
3309	fat_inode_t* inode; // searched file inode pointer
3310
3311	#if GIET_DEBUG_FAT
3312	unsigned int procid = _get_procid();
3313	unsigned int x = procid >> (Y_WIDTH + P_WIDTH);
3314	unsigned int y = (procid >> P_WIDTH) & ((1<<Y_WIDTH)-1);
3315	unsigned int p = procid & ((1<<P_WIDTH)-1);
3316	if ( _get_proctime() > GIET_DEBUG_FAT )
3317	_printf("\n[DEBUG FAT] _fat_remove(): P[%d,%d,%d] enters for path <%s>\n",
3318	x, y, p, pathname );
3319	#endif
3320
3321	// checking FAT initialized
3322	if( _fat.initialized != FAT_INITIALIZED )
3323	{
3324	_printf("\n[FAT ERROR] _fat_remove(): FAT not initialized\n");
3325	return GIET_FAT32_NOT_INITIALIZED;
3326	}
3327
3328	// takes the FAT lock and register it in thread context
3329	static_scheduler_t* psched = _get_sched();
3330	unsigned int ltid = _get_thread_ltid();
3331	_spin_lock_acquire( &_fat.fat_lock );
3332	_atomic_or( &psched->context[ltid].slot[CTX_LOCKS_ID] , LOCKS_MASK_FAT );
3333
3334
3335	// get searched file inode
3336	unsigned int code = _get_inode_from_path( pathname , &inode );
3337
3338	#if GIET_DEBUG_FAT
3339	if ( _get_proctime() > GIET_DEBUG_FAT )
3340	_printf("\n[DEBUG FAT] _fat_remove(): P[%d,%d,%d] found inode %x for <%s> / code = %d\n",
3341	x , y , p , (unsigned int)inode , pathname , code );
3342	#endif
3343
3344	if ( (code == 1) \|\| (code == 2) )
3345	{
3346	_spin_lock_release( &_fat.fat_lock );
3347	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3348
3349	_printf("\n[FAT ERROR] _fat_remove(): file <%s> not found\n",
3350	pathname );
3351	return GIET_FAT32_FILE_NOT_FOUND;
3352	}
3353	else if ( code == 3 )
3354	{
3355	_spin_lock_release( &_fat.fat_lock );
3356	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3357
3358	_printf("\n[FAT ERROR] _fat_remove(): name too long in <%s>\n",
3359	pathname );
3360	return GIET_FAT32_NAME_TOO_LONG;
3361	}
3362
3363	// check inode type
3364	if ( (inode->is_dir != 0) && (should_be_dir == 0) )
3365	{
3366	_spin_lock_release( &_fat.fat_lock );
3367	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3368
3369	_printf("\n[FAT ERROR] _fat_remove(): <%s> is a directory\n",
3370	pathname );
3371	return GIET_FAT32_IS_DIRECTORY;
3372	}
3373	if ( (inode->is_dir == 0) && (should_be_dir != 0) )
3374	{
3375	_spin_lock_release( &_fat.fat_lock );
3376	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3377
3378	_printf("\n[FAT ERROR] _fat_remove(): <%s> is not a directory\n",
3379	pathname );
3380	return GIET_FAT32_NOT_A_DIRECTORY;
3381	}
3382
3383	#if GIET_DEBUG_FAT
3384	if ( _get_proctime() > GIET_DEBUG_FAT )
3385	_printf("\n[DEBUG FAT] _fat_remove(): P[%d,%d,%d] checked inode type for <%s>\n",
3386	x , y , p , pathname );
3387	#endif
3388
3389	// check references count for a file
3390	if ( (inode->is_dir == 0) && (inode->count != 0) )
3391	{
3392	_spin_lock_release( &_fat.fat_lock );
3393	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3394
3395	_printf("\n[FAT ERROR] _fat_remove(): file <%s> still referenced\n",
3396	pathname );
3397	return GIET_FAT32_IS_OPEN;
3398	}
3399
3400	// check empty for a directory
3401	if ( inode->is_dir )
3402	{
3403	unsigned int entries;
3404	if ( _get_nb_entries( inode , &entries ) )
3405	{
3406	_spin_lock_release( &_fat.fat_lock );
3407	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3408
3409	_printf("\n[FAT ERROR] _fat_remove(): cannot scan directory <%s>\n",
3410	pathname );
3411	return GIET_FAT32_IO_ERROR;
3412	}
3413	else if ( entries > 2 )
3414	{
3415	_spin_lock_release( &_fat.fat_lock );
3416	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3417
3418	_printf("\n[FAT ERROR] _fat_remove(): directory <%s> not empty\n",
3419	pathname );
3420	return GIET_FAT32_DIRECTORY_NOT_EMPTY;
3421	}
3422	}
3423
3424	#if GIET_DEBUG_FAT
3425	if ( _get_proctime() > GIET_DEBUG_FAT )
3426	_printf("\n[DEBUG FAT] _fat_remove(): P[%d,%d,%d] checked remove condition OK for <%s>\n",
3427	x , y , p , pathname );
3428	#endif
3429
3430	// remove the file or directory from the file system
3431	if ( _remove_node_from_fs( inode ) )
3432	{
3433	_spin_lock_release( &_fat.fat_lock );
3434	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3435
3436	_printf("\n[FAT ERROR] _fat_remove(): cannot remove <%s> from FS\n",
3437	pathname );
3438	return GIET_FAT32_IO_ERROR;
3439	}
3440
3441	// release lock and return success
3442	_spin_lock_release( &_fat.fat_lock );
3443	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3444
3445	#if GIET_DEBUG_FAT
3446	if ( _get_proctime() > GIET_DEBUG_FAT )
3447	_printf("\n[DEBUG FAT] _fat_remove(): P[%d,%d,%d] removed <%s> from FS\n",
3448	x, y, p, pathname );
3449	#endif
3450
3451	return GIET_FAT32_OK;
3452
3453	} // end _fat_remove()
3454
3455
3456
3457
3458
3459	/////////////////////////////////
3460	int _fat_rename( char* old_path,
3461	char* new_path )
3462	{
3463	fat_inode_t* inode; // anonymous inode pointer
3464	fat_inode_t* old; // inode identified by old_path => to be deleted
3465	fat_inode_t* new; // inode identified by new_path => to be created
3466	fat_inode_t* old_parent; // parent inode in old_path => to be modified
3467	fat_inode_t* new_parent; // parent inode in new_path => to be modified
3468	fat_inode_t* to_remove; // previouly identified by new_path => to be removed
3469	unsigned int code;
3470
3471	#if GIET_DEBUG_FAT
3472	unsigned int procid = _get_procid();
3473	unsigned int x = procid >> (Y_WIDTH + P_WIDTH);
3474	unsigned int y = (procid >> P_WIDTH) & ((1<<Y_WIDTH)-1);
3475	unsigned int p = procid & ((1<<P_WIDTH)-1);
3476	if ( _get_proctime() > GIET_DEBUG_FAT )
3477	_printf("\n[DEBUG FAT] _fat_rename(): P[%d,%d,%d] enters to move <%s> to <%s>\n",
3478	x , y , p , old_path , new_path );
3479	#endif
3480
3481	// checking FAT initialized
3482	if( _fat.initialized != FAT_INITIALIZED )
3483	{
3484	_printf("\n[FAT ERROR] _fat_rename(): FAT not initialized\n");
3485	return GIET_FAT32_NOT_INITIALIZED;
3486	}
3487
3488	// takes the FAT lock and register it in thread context
3489	static_scheduler_t* psched = _get_sched();
3490	unsigned int ltid = _get_thread_ltid();
3491	_spin_lock_acquire( &_fat.fat_lock );
3492	_atomic_or( &psched->context[ltid].slot[CTX_LOCKS_ID] , LOCKS_MASK_FAT );
3493
3494
3495	// get "old" and "old_parent" inode pointers
3496	if ( _get_inode_from_path( old_path , &inode ) )
3497	{
3498	_spin_lock_release( &_fat.fat_lock );
3499	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3500
3501	_printf("\n[FAT ERROR] _fat_rename(): <%s> not found\n", old_path );
3502	return GIET_FAT32_FILE_NOT_FOUND;
3503	}
3504	else
3505	{
3506	old = inode;
3507	old_parent = inode->parent;
3508	}
3509
3510	// get "to_removed" and "new_parent" inode pointers
3511	code = _get_inode_from_path( new_path , &inode );
3512
3513	if ( code == 0 ) // new_path inode already exist
3514	{
3515	if ( inode == old ) // the file will replace itself, do nothing
3516	{
3517	_spin_lock_release( &_fat.fat_lock );
3518	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3519
3520	return GIET_FAT32_OK;
3521	}
3522
3523	to_remove = inode;
3524	new_parent = inode->parent;
3525	}
3526	else if ( code == 1 ) // to_remove does not exist but parent exist
3527	{
3528	to_remove = NULL;
3529	new_parent = inode;
3530	}
3531	else // parent directory in new_path not found
3532	{
3533	_spin_lock_release( &_fat.fat_lock );
3534	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3535
3536	_printf("\n[FAT ERROR] _fat_rename(): <%s> not found\n", new_path );
3537	return GIET_FAT32_FILE_NOT_FOUND;
3538	}
3539
3540	// check for move into own subdirectory
3541	if ( _is_ancestor( old, new_parent ) )
3542	{
3543	_spin_lock_release( &_fat.fat_lock );
3544	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3545
3546	_printf("\n[FAT ERROR] _fat_rename(): can't move %s into own directory\n", old_path );
3547	return GIET_FAT32_MOVE_INTO_SUBDIR;
3548	}
3549
3550	#if GIET_DEBUG_FAT
3551	if ( _get_proctime() > GIET_DEBUG_FAT )
3552	{
3553	if ( to_remove )
3554	_printf("\n[DEBUG FAT] _fat_rename(): old_parent = %s / old = %s / new_parent = %s "
3555	"/ to_remove = %s\n",
3556	old_parent->name , old->name , new_parent->name , to_remove->name );
3557	else
3558	_printf("\n[DEBUG FAT] _fat_rename(): old_parent = %s / old = %s / new_parent = %s "
3559	"/ no remove\n",
3560	old_parent->name , old->name , new_parent->name );
3561	}
3562	#endif
3563
3564	// check remove condition for "to_remove" inode
3565	if ( to_remove )
3566	{
3567	if ( to_remove->is_dir ) // it's a directory
3568	{
3569	unsigned int entries;
3570	if ( _get_nb_entries( to_remove , &entries ) )
3571	{
3572	_spin_lock_release( &_fat.fat_lock );
3573	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3574
3575	_printf("\n[FAT ERROR] _fat_rename(): cannot scan directory <%s>\n",
3576	to_remove->name );
3577	return GIET_FAT32_IO_ERROR;
3578	}
3579	else if ( entries > 2 )
3580	{
3581	_spin_lock_release( &_fat.fat_lock );
3582	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3583
3584	_printf("\n[FAT ERROR] _fat_rename(): directory <%s> not empty\n",
3585	to_remove->name );
3586	return GIET_FAT32_DIRECTORY_NOT_EMPTY;
3587	}
3588	}
3589	else // it's a file
3590	{
3591	if ( to_remove->count )
3592	{
3593	_spin_lock_release( &_fat.fat_lock );
3594	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3595
3596	_printf("\n[FAT ERROR] _fat_rename(): file <%s> still referenced\n",
3597	to_remove->name );
3598	return GIET_FAT32_IS_OPEN;
3599	}
3600	}
3601	}
3602
3603	#if GIET_DEBUG_FAT
3604	if ( _get_proctime() > GIET_DEBUG_FAT )
3605	_printf("\n[FAT DEBUG] _fat_rename(): P[%d,%d,%d] checked remove condition OK\n",
3606	x , y , p );
3607	#endif
3608
3609	// get new last name / error checking already done by _get_inode_from_path()
3610	char new_name[32];
3611	_get_last_name( new_path , new_name );
3612
3613	// allocate "new" inode
3614	new = _allocate_one_inode( new_name,
3615	old->is_dir,
3616	old->cluster,
3617	old->size,
3618	0, // count
3619	0, // dentry set by _add_dir_entry()
3620	0 ); // no cache_allocate
3621
3622	// attach the "old" File-Cache to the "new" inode
3623	new->levels = old->levels;
3624	new->cache = old->cache;
3625
3626	// add "new" to "new_parent" directory in Inode-Tree
3627	_add_inode_in_tree( new , new_parent );
3628
3629	// add "new" to "new_parent" directory File-Cache
3630	// and update the dentry field in new inode
3631	if ( _add_dir_entry( new ) )
3632	{
3633	_spin_lock_release( &_fat.fat_lock );
3634	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3635
3636	_printf("\n[FAT ERROR] _fat_rename(): cannot add <%s> into <%s>\n",
3637	new->name , new_parent->name );
3638	return GIET_FAT32_IO_ERROR;
3639	}
3640
3641	// updates "new_parent" directory on device
3642	if ( _update_device_from_cache( new_parent->levels,
3643	new_parent->cache,
3644	new_parent->name ) )
3645	{
3646	_spin_lock_release( &_fat.fat_lock );
3647	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3648
3649	_printf("\n[FAT ERROR] _fat_rename(): cannot update <%s> on device\n",
3650	new_parent->name );
3651	return GIET_FAT32_IO_ERROR;
3652	}
3653
3654	// remove "old" from "old_parent" File-Cache
3655	if ( _remove_dir_entry( old ) )
3656	{
3657	_spin_lock_release( &_fat.fat_lock );
3658	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3659
3660	_printf("\n[FAT ERROR] _fat_rename(): cannot remove <%s> from <%s>\n",
3661	old->name , old_parent->name );
3662	return GIET_FAT32_IO_ERROR;
3663	}
3664
3665	// remove "old" inode from Inode-Tree
3666	_remove_inode_from_tree( old );
3667
3668	// release "old" inode
3669	_free( old );
3670
3671	// updates "old_parent" directory on device
3672	if ( _update_device_from_cache( old_parent->levels,
3673	old_parent->cache,
3674	old_parent->name ) )
3675	{
3676	_spin_lock_release( &_fat.fat_lock );
3677	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3678
3679	_printf("\n[FAT ERROR] _fat_rename(): cannot update <%s> on device\n",
3680	old_parent->name );
3681	return GIET_FAT32_IO_ERROR;
3682	}
3683
3684	// remove "to_remove" from File System (if required)
3685	if ( to_remove )
3686	{
3687	if ( _remove_node_from_fs( to_remove ) )
3688	{
3689	_spin_lock_release( &_fat.fat_lock );
3690	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3691
3692	_printf("\n[FAT ERROR] _fat_rename(): cannot remove <%s> from FS\n",
3693	to_remove->name );
3694	return GIET_FAT32_IO_ERROR;
3695	}
3696	}
3697
3698	// release lock
3699	_spin_lock_release( &_fat.fat_lock );
3700	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3701
3702	return GIET_FAT32_OK;
3703	} // end _fat_rename()
3704
3705
3706
3707
3708	////////////////////////////////
3709	int _fat_mkdir( char* pathname )
3710	{
3711	fat_inode_t* inode; // anonymous inode pointer
3712	fat_inode_t* child; // searched directory inode pointer
3713	fat_inode_t* parent; // parent directory inode pointer
3714
3715	#if GIET_DEBUG_FAT
3716	unsigned int procid = _get_procid();
3717	unsigned int x = procid >> (Y_WIDTH + P_WIDTH);
3718	unsigned int y = (procid >> P_WIDTH) & ((1<<Y_WIDTH)-1);
3719	unsigned int p = procid & ((1<<P_WIDTH)-1);
3720	if ( _get_proctime() > GIET_DEBUG_FAT )
3721	_printf("\n[DEBUG FAT] _fat_mkdir(): P[%d,%d,%d] enters for path <%s>\n",
3722	x, y, p, pathname );
3723	#endif
3724
3725	// checking FAT initialized
3726	if( _fat.initialized != FAT_INITIALIZED )
3727	{
3728	_printf("\n[FAT ERROR] _fat_mkdir(): FAT not initialized\n");
3729	return GIET_FAT32_NOT_INITIALIZED;
3730	}
3731
3732	// takes the FAT lock and register it in thread context
3733	static_scheduler_t* psched = _get_sched();
3734	unsigned int ltid = _get_thread_ltid();
3735	_spin_lock_acquire( &_fat.fat_lock );
3736	_atomic_or( &psched->context[ltid].slot[CTX_LOCKS_ID] , LOCKS_MASK_FAT );
3737
3738	// get inode
3739	unsigned int code = _get_inode_from_path( pathname , &inode );
3740
3741	if ( code == 2 )
3742	{
3743	_spin_lock_release( &_fat.fat_lock );
3744	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3745
3746	_printf("\n[FAT ERROR] _fat_mkdir(): path to parent not found"
3747	" for directory <%s>\n", pathname );
3748	return GIET_FAT32_FILE_NOT_FOUND;
3749	}
3750	else if ( code == 3 )
3751	{
3752	_spin_lock_release( &_fat.fat_lock );
3753	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3754
3755	_printf("\n[FAT ERROR] _fat_mkdir(): one name in path too long"
3756	" for directory <%s>\n", pathname );
3757	return GIET_FAT32_NAME_TOO_LONG;
3758	}
3759	else if ( code == 0 )
3760	{
3761	_spin_lock_release( &_fat.fat_lock );
3762	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3763
3764	_printf("\n[FAT ERROR] _fat_mkdir(): directory <%s> already exist\n",
3765	pathname );
3766	return GIET_FAT32_FILE_EXISTS;
3767	}
3768	else if ( code == 1 ) // directory not found => create
3769	{
3770	parent = inode;
3771
3772	#if GIET_DEBUG_FAT
3773	if ( _get_proctime() > GIET_DEBUG_FAT )
3774	_printf("\n[DEBUG FAT] _fat_mkdir(): P[%d,%d,%d] create new directory <%s>\n",
3775	x , y , p , pathname );
3776	#endif
3777
3778	// get directory name / error check already done by _get_inode_from_path()
3779	char name[32];
3780	_get_last_name( pathname , name );
3781
3782	// allocate a new inode and an empty Cache-File
3783	child = _allocate_one_inode( name,
3784	1, // it's a directory
3785	END_OF_CHAIN_CLUSTER_MAX, // cluster set later
3786	0, // size = 0 for directory
3787	0, // count
3788	0, // dentry set later
3789	1 ); // cache_allocate
3790
3791	// introduce inode in Inode-Tree
3792	_add_inode_in_tree( child , parent );
3793
3794	// allocate one cluster from FAT for child
3795	unsigned int cluster;
3796	if ( _one_cluster_allocate( child , &cluster ) )
3797	{
3798	_spin_lock_release( &_fat.fat_lock );
3799	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3800
3801	_printf("\n[FAT ERROR] _fat_mkdir(): no free cluster"
3802	" for directory <%s>\n" , pathname );
3803	return GIET_FAT32_NO_FREE_SPACE;
3804	}
3805
3806	// update cluster index in inode
3807	child->cluster = cluster;
3808
3809	// add new entry in parent directory File-Cache
3810	// and update dentry field in child inode
3811	if ( _add_dir_entry( child ) )
3812	{
3813	_spin_lock_release( &_fat.fat_lock );
3814	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3815
3816	_printf("\n[FAT ERROR] _fat_mkdir(): cannot update parent directory"
3817	" for directory <%s>\n" , pathname );
3818	return GIET_FAT32_IO_ERROR;
3819	}
3820
3821	// add "." and ".." directories in child directory
3822	_add_special_directories( child );
3823
3824	// update DATA region on block device for parent directory
3825	if ( _update_device_from_cache( parent->levels,
3826	parent->cache,
3827	parent->name ) )
3828	{
3829	_spin_lock_release( &_fat.fat_lock );
3830	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3831
3832	_printf("\n[FAT ERROR] _fat_mkdir(): cannot update DATA region "
3833	" for parent of directory <%s>\n", pathname );
3834	return GIET_FAT32_IO_ERROR;
3835	}
3836
3837	// update FAT region on block device
3838	if ( _update_device_from_cache( _fat.fat_cache_levels,
3839	_fat.fat_cache_root,
3840	"FAT" ) )
3841	{
3842	_spin_lock_release( &_fat.fat_lock );
3843	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3844
3845	_printf("\n[FAT ERROR] _fat_mkdir(): cannot update FAT region"
3846	" for directory <%s>\n", pathname );
3847	return GIET_FAT32_IO_ERROR;
3848	}
3849
3850	// update DATA region on block device for the new directory
3851	if ( _update_device_from_cache( child->levels,
3852	child->cache,
3853	child->name ) )
3854	{
3855	_spin_lock_release( &_fat.fat_lock );
3856	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3857
3858	_printf("\n[FAT ERROR] _fat_mkdir(): cannot update DATA region"
3859	" for directory <%s>\n", pathname );
3860	return GIET_FAT32_IO_ERROR;
3861	}
3862	} // end create directory
3863
3864	// release lock
3865	_spin_lock_release( &_fat.fat_lock );
3866	_atomic_and( &psched->context[ltid].slot[CTX_LOCKS_ID] , ~LOCKS_MASK_FAT );
3867
3868	return GIET_FAT32_OK;
3869	} // end _fat_mkdir()
3870
3871
3872
3873
3874	/////////////////////////////////////////
3875	extern int _fat_opendir( char* pathname )
3876	{
3877	int fd_id = _fat_open( pathname, O_RDONLY );
3878
3879	if ( fd_id < 0 )
3880	return fd_id;
3881
3882	if ( !_fat.fd[fd_id].inode->is_dir )
3883	{
3884	_printf("\n[FAT ERROR] _fat_opendir(): <%s> is not a directory\n",
3885	pathname );
3886	return GIET_FAT32_NOT_A_DIRECTORY;
3887	}
3888
3889	return fd_id;
3890	}
3891
3892
3893
3894
3895	//////////////////////////////////////////////
3896	extern int _fat_closedir( unsigned int fd_id )
3897	{
3898	return _fat_close( fd_id );
3899	}
3900
3901
3902
3903
3904	/////////////////////////////////////////////
3905	extern int _fat_readdir( unsigned int fd_id,
3906	fat_dirent_t* entry )
3907	{
3908	unsigned int lfn = 0; // lfn entries count
3909	unsigned int attr; // ATTR field value
3910	unsigned int ord; // ORD field value
3911	char lfn1[16]; // temporary buffer for string in LFN1
3912	char lfn2[16]; // temporary buffer for string in LFN2
3913	char lfn3[16]; // temporary buffer for string in LFN3
3914	unsigned char buf[DIR_ENTRY_SIZE]; // raw entry buffer
3915	fat_file_info_t info;
3916
3917	// check for directory
3918	int ret = _fat_file_info( fd_id, &info );
3919	if (ret < 0)
3920	{
3921	return ret;
3922	}
3923	else if ( !info.is_dir )
3924	{
3925	_printf("\n[FAT ERROR] in _fat_readdir(): not a directory\n" );
3926	return GIET_FAT32_NOT_A_DIRECTORY;
3927	}
3928
3929
3930	#if GIET_DEBUG_FAT
3931	unsigned int procid = _get_procid();
3932	unsigned int x = procid >> (Y_WIDTH + P_WIDTH);
3933	unsigned int y = (procid >> P_WIDTH) & ((1<<Y_WIDTH)-1);
3934	unsigned int p = procid & ((1<<P_WIDTH)-1);
3935	if ( _get_proctime() > GIET_DEBUG_FAT )
3936	_printf("\n[DEBUG FAT] _fat_readdir(): P[%d,%d,%d] enter for <%s>\n",
3937	x , y , p , _fat.fd[fd_id].inode->name );
3938	#endif
3939
3940	while ( 1 )
3941	{
3942	if ( _fat_read( fd_id,
3943	(unsigned int)&buf,
3944	DIR_ENTRY_SIZE,
3945	0, 0, 0 ) != sizeof(buf) )
3946	{
3947	_printf("\n[FAT ERROR] in _fat_readdir(): can't read entry\n" );
3948	return GIET_FAT32_IO_ERROR;
3949	}
3950
3951	attr = _read_entry( DIR_ATTR, buf, 0 );
3952	ord = _read_entry( LDIR_ORD, buf, 0 );
3953
3954	if (ord == NO_MORE_ENTRY) // no more entry in directory => stop
3955	{
3956	// seek back to this entry
3957	_atomic_increment( &_fat.fd[fd_id].seek , -DIR_ENTRY_SIZE );
3958
3959	return GIET_FAT32_NO_MORE_ENTRIES;
3960	}
3961	else if ( ord == FREE_ENTRY ) // free entry => skip
3962	{
3963	continue;
3964	}
3965	else if ( attr == ATTR_LONG_NAME_MASK ) // LFN entry => get partial names
3966	{
3967	unsigned int seq = ord & 0x3;
3968	lfn = (seq > lfn) ? seq : lfn;
3969	if ( seq == 1 ) _get_name_from_long( buf, lfn1 );
3970	else if ( seq == 2 ) _get_name_from_long( buf, lfn2 );
3971	else if ( seq == 3 ) _get_name_from_long( buf, lfn3 );
3972	continue;
3973	}
3974	else // NORMAL entry => stop
3975	{
3976	break;
3977	}
3978	}
3979
3980	// TODO handle is_vid
3981	entry->cluster = (_read_entry( DIR_FST_CLUS_HI, buf, 1 ) << 16) \|
3982	(_read_entry( DIR_FST_CLUS_LO, buf, 1 ) ) ;
3983	entry->size = (_read_entry( DIR_FILE_SIZE , buf, 1 ) ) ;
3984	entry->is_dir = ((attr & ATTR_DIRECTORY) == ATTR_DIRECTORY);
3985
3986	if ( lfn == 0 )
3987	{
3988	_get_name_from_short( buf, entry->name );
3989	}
3990	else if ( lfn == 1 )
3991	{
3992	_strcpy( entry->name , lfn1 );
3993	}
3994	else if ( lfn == 2 )
3995	{
3996	_strcpy( entry->name , lfn1 );
3997	_strcpy( entry->name + 13, lfn2 );
3998	}
3999	else if ( lfn == 3 )
4000	{
4001	_strcpy( entry->name , lfn1 );
4002	_strcpy( entry->name + 13, lfn2 );
4003	_strcpy( entry->name + 26, lfn3 );
4004	}
4005
4006	return GIET_FAT32_OK;
4007	} // end _fat_readdir()
4008
4009
4010
4011
4012	///////////////////////////////////////////////
4013	int _fat_load_no_cache( char* pathname,
4014	unsigned int buffer_vbase,
4015	unsigned int buffer_size )
4016	{
4017	// checking FAT initialized
4018	if( _fat.initialized != FAT_INITIALIZED )
4019	{
4020	_printf("\n[FAT ERROR] _fat_load_no_cache(): FAT not initialized\n");
4021	return GIET_FAT32_NOT_INITIALIZED;
4022	}
4023
4024	unsigned int file_size;
4025	unsigned int cluster;
4026
4027	#if GIET_DEBUG_FAT
4028	unsigned int procid = _get_procid();
4029	unsigned int x = procid >> (Y_WIDTH + P_WIDTH);
4030	unsigned int y = (procid >> P_WIDTH) & ((1<<Y_WIDTH)-1);
4031	unsigned int p = procid & ((1<<P_WIDTH)-1);
4032	if ( _get_proctime() > GIET_DEBUG_FAT )
4033	_printf("\n[DEBUG FAT] _fat_load_no_cache(): P[%d,%d,%d] enters for file <%s>\n",
4034	x , y , p , pathname );
4035	#endif
4036
4037	// get file size, and cluster index in FAT
4038	if ( _file_info_no_cache( pathname,
4039	&cluster,
4040	&file_size ) )
4041	{
4042	_printf("\n[FAT ERROR] _fat_load_no_cache(): file <%s> not found\n",
4043	pathname );
4044	return GIET_FAT32_FILE_NOT_FOUND;
4045	}
4046
4047	// check buffer size
4048	if ( file_size > buffer_size )
4049	{
4050	_printf("\n[FAT ERROR] _fat_load_no_cache(): buffer too small : "
4051	"file_size = %x / buffer_size = %x", file_size , buffer_size );
4052	return GIET_FAT32_BUFFER_TOO_SMALL;
4053	}
4054
4055	// compute total number of clusters to read
4056	unsigned int nb_clusters = file_size >> 12;
4057	if ( file_size & 0xFFF ) nb_clusters++;
4058
4059	// initialise buffer address
4060	unsigned int dst = buffer_vbase;
4061
4062	// loop on the clusters containing the file
4063	while ( nb_clusters > 0 )
4064	{
4065	unsigned int lba = _cluster_to_lba( cluster );
4066
4067	if( _fat_ioc_access( 0, // no descheduling
4068	1, // read
4069	lba,
4070	dst,
4071	8 ) ) // 8 blocks
4072	{
4073	_printf("\n[FAT ERROR] _fat_load_no_cache(): cannot load lba %x", lba );
4074	return GIET_FAT32_IO_ERROR;
4075	}
4076
4077
4078	// compute next cluster index
4079	unsigned int next;
4080	if ( _next_cluster_no_cache( cluster , &next ) )
4081	{
4082	_printf("\n[FAT ERROR] _fat_load_no_cache(): cannot get next cluster "
4083	" for cluster = %x\n", cluster );
4084	return GIET_FAT32_IO_ERROR;
4085	}
4086
4087	// update variables for next iteration
4088	nb_clusters = nb_clusters - 1;
4089	dst = dst + 4096;
4090	cluster = next;
4091	}
4092
4093	#if GIET_DEBUG_FAT
4094	if ( _get_proctime() > GIET_DEBUG_FAT )
4095	_printf("\n[DEBUG FAT] _fat_load_no_cache(): P[%d,%d,%d] loaded <%s> at vaddr = %x"
4096	" / size = %x\n", x , y , p , pathname , buffer_vbase , file_size );
4097	#endif
4098
4099	return GIET_FAT32_OK;
4100	} // end _fat_load_no_cache()
4101
4102
4103
4104
4105	//////////////////////////////////////////////////////////
4106	int _get_fat_cache_buffer( unsigned int cluster_id,
4107	fat_cache_desc_t** desc )
4108	{
4109	// get cache pointer and number of levels
4110	fat_cache_node_t* node = _fat.fat_cache_root;
4111	unsigned int level = _fat.fat_cache_levels;
4112
4113	if ( _get_levels_from_size( (cluster_id + 1) * 4096 ) > level )
4114	{
4115	_printf("\n[FAT ERROR] in _get_fat_cache_buffer() : "
4116	"cluster_id %d too large\n", cluster_id );
4117	return GIET_FAT32_IO_ERROR;
4118	}
4119
4120	// search the 64-tree cache from top to bottom
4121	while ( level )
4122	{
4123	// compute child index at each level
4124	unsigned int index = (cluster_id >> (6*(level-1))) & 0x3F;
4125
4126	if ( level == 1 ) // last level => children are buffer descriptors
4127	{
4128	fat_cache_desc_t* pdesc = (fat_cache_desc_t*)node->children[index];
4129
4130	if ( pdesc == NULL ) // miss
4131	{
4132
4133	#if GIET_DEBUG_FAT
4134	if ( _get_proctime() > GIET_DEBUG_FAT )
4135	_printf("\n[DEBUG FAT] _get_fat_cache_buffer(): miss for cluster_id %d\n", cluster_id );
4136	#endif
4137	// compute missing cluster lba
4138	unsigned int lba = _fat.fat_lba + (cluster_id << 3);
4139
4140	// allocate a 4 Kbytes buffer and a buffer descriptor
4141	void* buf = _malloc( 4096 );
4142	pdesc = _malloc( sizeof(fat_cache_desc_t) );
4143	pdesc->lba = lba;
4144	pdesc->buffer = buf;
4145	pdesc->dirty = 0;
4146	node->children[index] = pdesc;
4147
4148	// load cluster from device
4149	if ( _fat_ioc_access( 1, // descheduling
4150	1, // to memory
4151	lba,
4152	(unsigned int)buf,
4153	8 ) )
4154	{
4155	_free( buf );
4156	_free( pdesc );
4157	_printf("\n[FAT ERROR] in _get_fat_cache_buffer() : "
4158	": cannot access block device for lba = %x\n", lba );
4159	return GIET_FAT32_IO_ERROR;
4160	}
4161
4162	}
4163
4164	// return pdesc pointer
4165	*desc = pdesc;
4166
4167	// prepare next iteration
4168	level--;
4169	}
4170	else // not last level => children are 64-tree nodes
4171	{
4172	fat_cache_node_t* child = (fat_cache_node_t*)node->children[index];
4173	if ( child == NULL ) // miss
4174	{
4175	// allocate a cache node if miss
4176	child = _allocate_one_cache_node( NULL );
4177	node->children[index] = child;
4178	}
4179
4180	// prepare next iteration
4181	node = child;
4182	level--;
4183	}
4184	} // end while
4185
4186	return 0;
4187	} // end _get_fat_cache_buffer()
4188
4189
4190
4191
4192	//////////////////////////////////////////////////////
4193	int _get_file_cache_buffer( fat_inode_t* inode,
4194	unsigned int cluster_id,
4195	unsigned int writable,
4196	fat_cache_desc_t** desc )
4197	{
4198
4199	#if GIET_DEBUG_FAT
4200	if ( _get_proctime() > GIET_DEBUG_FAT )
4201	_printf("\n[DEBUG FAT] _get_file_cache_buffer() : enters in File-Cache <%s>"
4202	" for cluster_id = %d\n size = %x / cache = %x / desc[%d] = %x\n",
4203	inode->name , cluster_id ,
4204	inode->size , (unsigned int)inode->cache , cluster_id ,
4205	(unsigned int)inode->cache->children[cluster_id] );
4206	#endif
4207
4208	// checking FAT initialized
4209	if( _fat.initialized != FAT_INITIALIZED )
4210	{
4211	_printf("\n[FAT ERROR] in _get_file_cache_buffer() : FAT not initialized\n");
4212	return GIET_FAT32_NOT_INITIALIZED;
4213	}
4214
4215	// checking arguments
4216	if ( inode == NULL ) // illegal inode argument
4217	{
4218	_printf("\n[FAT ERROR] in _get_file_cache_buffer() : illegal inode argument\n");
4219	return GIET_FAT32_INVALID_ARG;
4220	}
4221
4222	// add cache levels if needed
4223	while ( _get_levels_from_size( (cluster_id + 1) * 4096 ) > inode->levels )
4224	{
4225
4226	#if GIET_DEBUG_FAT
4227	if ( _get_proctime() > GIET_DEBUG_FAT )
4228	_printf("\n[DEBUG FAT] _get_file_cache_buffer() : add a File-Cache level\n" );
4229	#endif
4230
4231	inode->cache = _allocate_one_cache_node( inode->cache );
4232	inode->levels++;
4233	}
4234
4235	// get inode type, size, and File-Cache
4236	unsigned int size = inode->size;
4237	unsigned int is_dir = inode->is_dir;
4238	fat_cache_node_t* node = inode->cache;
4239	unsigned int level = inode->levels;
4240
4241	// search the 64-tree cache from top to bottom
4242	while ( level )
4243	{
4244	// compute child index at each level
4245	unsigned int index = (cluster_id >> (6*(level-1))) & 0x3F;
4246
4247	if ( level == 1 ) // last level => children are buffer descriptors
4248	{
4249	fat_cache_desc_t* pdesc = (fat_cache_desc_t*)node->children[index];
4250	unsigned int next = 0;
4251	unsigned int prev = 0;
4252	unsigned int current;
4253	unsigned int cid;
4254	unsigned int lba;
4255	unsigned int one_cluster_allocated;
4256
4257	// File-Cache miss handling:
4258	// In case of miss, the missing buffer is allocated,
4259	// and the missing cluster is loaded from block device.
4260	// A new cluster is allocated from FAT if required, when
4261	// the writable argument is set.
4262	if ( pdesc == NULL )
4263	{
4264
4265	#if GIET_DEBUG_FAT
4266	if ( _get_proctime() > GIET_DEBUG_FAT )
4267	_printf("\n[DEBUG FAT] _get_file_cache_buffer() : miss in File-Cache <%s> "
4268	" for cluster_id = %d\n"
4269	" cluster = %x / size = %x / is_dir = %d / cache = %x / desc[%d] = %x\n",
4270	inode->name , cluster_id , inode->cluster , inode->size , inode->is_dir ,
4271	(unsigned int)inode->cache , cluster_id ,
4272	(unsigned int)inode->cache->children[cluster_id] );
4273	#endif
4274	// compute one_cluster_allocated condition, depending on file / dir type
4275	if ( is_dir ) one_cluster_allocated = ( cluster_id < is_dir );
4276	else one_cluster_allocated = ( (cluster_id<<12) < size );
4277
4278	if ( one_cluster_allocated ) // cluster already allocated => allocate buffer
4279	{
4280	// scan the FAT to find the cluster index for cluster_id
4281	current = inode->cluster;
4282	for ( cid = 0 ; cid < cluster_id ; cid++ )
4283	{
4284	// get next cluster index from FAT
4285	if ( _get_fat_entry( current , &next ) ) return 1;
4286	current = next;
4287	}
4288
4289	// compute lba
4290	lba = _cluster_to_lba( current );
4291
4292	// allocate a 4 Kbytes buffer and a buffer descriptor
4293	// the selected heap depends on the calling thread
4294	void* buf = _malloc( 4096 );
4295	pdesc = _malloc( sizeof(fat_cache_desc_t) );
4296
4297	// set buffer descriptor
4298	pdesc->lba = lba;
4299	pdesc->buffer = buf;
4300	pdesc->dirty = writable;
4301	node->children[index] = pdesc;
4302
4303	// load cluster from device
4304	if ( _fat_ioc_access( 1, // descheduling
4305	1, // to memory
4306	lba,
4307	(unsigned int)buf,
4308	8 ) )
4309	{
4310
4311	_free( buf );
4312	_free( pdesc );
4313	_printf("\n[FAT ERROR] in _get_file_cache_buffer() : "
4314	"cannot access block device for lba = %x\n", lba );
4315	return GIET_FAT32_IO_ERROR;
4316	}
4317	}
4318	else if ( writable == 0 ) // not writable and cluster not allocated in FAT
4319	{
4320	_printf("\n[FAT ERROR] in _get_file_cache_buffer() : "
4321	" file size too small for <%s>\n"
4322	" size = %x / cluster_id = %d / procid = %x\n",
4323	inode->name , inode->size , cluster_id , _get_procid() );
4324	return GIET_FAT32_IO_ERROR;
4325	}
4326	else // writable and cluster NOT allocated in FAT => allocate cluster & buffer
4327	{
4328	// scan the FAT to allocate all required clusters
4329	current = inode->cluster;
4330	for ( cid = 0 ; cid <= cluster_id ; cid++ )
4331	{
4332	if ( current >= END_OF_CHAIN_CLUSTER_MIN ) // non allocated
4333	{
4334	// allocate one cluster on device
4335	if ( _one_cluster_allocate( inode , &current ) )
4336	{
4337	_printf("\n[FAT ERROR] in _get_file_cache_buffer() : "
4338	"cannot allocate new cluster for file <%s>\n",
4339	inode->name );
4340	return GIET_FAT32_IO_ERROR;
4341	}
4342	}
4343
4344	// get next cluster index from FAT
4345	if ( _get_fat_entry( current , &next ) )
4346	{
4347	_printf("\n[FAT ERROR] in _get_file_cache_buffer() : "
4348	"cannot get next cluster for file <%s>\n",
4349	inode->name );
4350	return GIET_FAT32_IO_ERROR;
4351	}
4352	prev = current;
4353	current = next;
4354	}
4355
4356	// update size or is_dir attributes in inode
4357	if ( is_dir ) inode->is_dir = cluster_id;
4358	else inode->size = (cluster_id + 1)<<12;
4359
4360	// update directory entry from inode
4361	_update_dir_entry( inode );
4362
4363	// compute lba
4364	lba = _cluster_to_lba( current );
4365
4366	// allocate a 4 Kbytes buffer and a buffer descriptor
4367	// the selected heap depends on the calling thread
4368	void* buf = _malloc( 4096 );
4369	pdesc = _malloc( sizeof(fat_cache_desc_t) );
4370
4371	// set buffer descriptor
4372	pdesc->lba = lba;
4373	pdesc->buffer = buf;
4374	pdesc->dirty = writable;
4375	node->children[index] = pdesc;
4376	}
4377	} // end File-Cache miss handling
4378
4379	// return pdesc pointer
4380	*desc = pdesc;
4381
4382	#if GIET_DEBUG_FAT
4383	if ( _get_proctime() > GIET_DEBUG_FAT )
4384	_printf("\n[DEBUG FAT] _get_file_cache_buffer(): found buffer = %x "
4385	" in file <%s> for cluster_id %d\n",
4386	(unsigned int)pdesc->buffer , inode->name , cluster_id );
4387	#endif
4388	// prepare next iteration
4389	level--;
4390	}
4391	else // not last level => children are 64-tree nodes
4392	{
4393	fat_cache_node_t* child = (fat_cache_node_t*)node->children[index];
4394	if ( child == NULL ) // miss
4395	{
4396	// allocate a cache node if miss
4397	child = _allocate_one_cache_node( NULL );
4398	node->children[index] = child;
4399	}
4400
4401	// prepare next iteration
4402	node = child;
4403	level--;
4404	}
4405	} // end while
4406
4407	return GIET_FAT32_OK;
4408
4409	} // end _get_file_cache_buffer()
4410
4411
4412
4413
4414
4415
4416	// Local Variables:
4417	// tab-width: 4
4418	// c-basic-offset: 4
4419	// c-file-offsets:((innamespace . 0)(inline-open . 0))
4420	// indent-tabs-mode: nil
4421	// End:
4422	// vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4
4423

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source: soft/giet_vm/giet_fat32/fat32.c @ 810

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