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source: trunk/kernel/vfs/fatfs.c @ 335

Last change on this file since 335 was 315, checked in by alain, 7 years ago
Redefine the fuctions ppm_base2page() / ppm_page2base() / ppm_page2ppn() / ppm_ppn2page() / ppm_base2ppn() / ppm_ppn2base(), to use explicitely extended pointers.
File size: 26.1 KB

Rev	Line
[1]	1	/*
	2	* fatfs.c - FATFS file system API implementation.
	3	*
[238]	4	* Author Alain Greiner (2016,2017)
[1]	5	*
	6	* Copyright (c) UPMC Sorbonne Universites
	7	*
	8	* This file is part of ALMOS-MKH.
	9	*
	10	* ALMOS-MKH is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; version 2.0 of the License.
	13	*
	14	* ALMOS-MKH is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with ALMOS-MKH; if not, write to the Free Software Foundation,
	21	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	22	*/
	23
	24
	25	#include <hal_types.h>
	26	#include <hal_special.h>
	27	#include <printk.h>
	28	#include <kmem.h>
	29	#include <ppm.h>
	30	#include <vfs.h>
[238]	31	#include <string.h>
[1]	32	#include <rpc.h>
	33	#include <mapper.h>
[23]	34	#include <cluster.h>
[1]	35	#include <dev_ioc.h>
	36	#include <fatfs.h>
	37
[50]	38
[23]	39	//////////////////////////////////////////////////////////////////////////////////////////
	40	// Extern variables
	41	//////////////////////////////////////////////////////////////////////////////////////////
[1]	42
[50]	43	extern vfs_ctx_t fs_context[FS_TYPES_NR]; // allocated in vfs.c file
[23]	44
[50]	45	extern remote_barrier_t global_barrier; // allocated in kernel_init.c
[23]	46
[1]	47	//////////////////////////////////////////////////////////////////////////////////////////
[265]	48	// FATFS specific and static functions
[1]	49	//////////////////////////////////////////////////////////////////////////////////////////
	50
[188]	51	//////////////////////////////////////////////////////////////////////////////////////////
[238]	52	// These functions return the "offset" and "length" values of an
	53	// [offset,length] constant defined in the fatfs.h file.
	54	//////////////////////////////////////////////////////////////////////////////////////////
	55
	56	static inline int get_length( int offset , int length ) { return length; }
	57
	58	static inline int get_offset( int offset , int length ) { return offset; }
	59
	60
	61	//////////////////////////////////////////////////////////////////////////////////////////
[188]	62	// This function returns the LBA of the first sector of a FAT cluster.
	63	// This function can be called by any thread running in any cluster.
	64	//////////////////////////////////////////////////////////////////////////////////////////
	65	// @ ctx : pointer on FATFS context.
	66	// @ cluster : cluster index in FATFS.
	67	// @ return the lba value.
	68	//////////////////////////////////////////////////////////////////////////////////////////
	69	static inline uint32_t fatfs_lba_from_cluster( fatfs_ctx_t * ctx,
	70	uint32_t cluster )
[1]	71	{
[23]	72	return (ctx->cluster_begin_lba + ((cluster - 2) << 3));
[1]	73	}
	74
[246]	75	//////////////////////////////////////////////////////////////////////////////////////////
[238]	76	// This function return an integer record value (one, two, or four bytes)
[23]	77	// from a memory buffer, taking into account endianness.
[238]	78	//////////////////////////////////////////////////////////////////////////////////////////
[23]	79	// @ offset : first byte of record in buffer.
	80	// @ size : record length in bytes (1/2/4).
	81	// @ buffer : pointer on buffer base.
	82	// @ little endian : the most significant byte has the highest address when true.
	83	// @ return the integer value in a 32 bits word.
[238]	84	//////////////////////////////////////////////////////////////////////////////////////////
	85	static uint32_t fatfs_get_record( uint32_t offset,
	86	uint32_t size,
	87	uint8_t * buffer,
	88	uint32_t little_endian )
[23]	89	{
	90	uint32_t n;
	91	uint32_t res = 0;
[1]	92
[23]	93	if ( little_endian)
	94	{
	95	for( n = size ; n > 0 ; n-- ) res = (res<<8) \| buffer[offset+n-1];
	96	}
	97	else
	98	{
	99	for( n = 0 ; n < size ; n++ ) res = (res<<8) \| buffer[offset+n];
	100	}
	101	return res;
	102
[238]	103	} // end fatfs_get_record()
[23]	104
[238]	105	//////////////////////////////////////////////////////////////////////////////////////////
	106	// This static function retun in the <name> buffer a short name stored in
	107	// a SFN FATFS directory entry.
	108	/////////////////////////i////////////////////////////////////////////////////////////////
	109	// @ buffer : pointer on buffer containing the directory entry.
	110	// @ name : [out] buffer allocated by the caller.
	111	//////////////////////////////////////////////////////////////////////////////////////////
	112	static void fatfs_get_name_from_short( uint8_t * buffer,
	113	char * name )
	114	{
	115	uint32_t i;
	116	uint32_t j = 0;
[23]	117
[238]	118	// get name
	119	for ( i = 0; i < 8 && buffer[i] != ' '; i++ )
	120	{
	121	name[j] = to_lower( buffer[i] );
	122	j++;
	123	}
[23]	124
[238]	125	// get extension
	126	for ( i = 8; i < 8 + 3 && buffer[i] != ' '; i++ )
	127	{
	128	// we entered the loop so there is an extension. add the dot
	129	if ( i == 8 )
	130	{
	131	name[j] = '.';
	132	j++;
	133	}
	134
	135	name[j] = to_lower( buffer[i] );
	136	j++;
	137	}
	138
	139	name[j] = '\0';
	140	}
	141
	142	//////////////////////////////////////////////////////////////////////////////////////////
	143	// This static function retun in the <name> buffer a partial name stored in
	144	// a LFN FATFS directory entry.
	145	/////////////////////////i////////////////////////////////////////////////////////////////
	146	// @ buffer : pointer on buffer containing the directory entry.
	147	// @ name : [out] buffer allocated by the caller.
	148	//////////////////////////////////////////////////////////////////////////////////////////
	149	static void fatfs_get_name_from_long( uint8_t * buffer,
	150	char * name )
	151	{
	152	uint32_t name_offset = 0;
	153	uint32_t buffer_offset = get_length(LDIR_ORD);
	154	uint32_t l_name_1 = get_length(LDIR_NAME_1);
	155	uint32_t l_name_2 = get_length(LDIR_NAME_2);
	156	uint32_t l_name_3 = get_length(LDIR_NAME_3);
	157	uint32_t l_attr = get_length(LDIR_ATTR);
	158	uint32_t l_type = get_length(LDIR_TYPE);
	159	uint32_t l_chksum = get_length(LDIR_CHKSUM);
	160	uint32_t l_rsvd = get_length(LDIR_RSVD);
	161
	162	uint32_t j = 0;
	163	uint32_t eof = 0;
	164
	165	while ( (buffer_offset != DIR_ENTRY_SIZE) && (!eof) )
	166	{
	167	while (j != l_name_1 && !eof )
	168	{
	169	if ( (buffer[buffer_offset] == 0x00) \|\|
	170	(buffer[buffer_offset] == 0xFF) )
	171	{
	172	eof = 1;
	173	continue;
	174	}
	175	name[name_offset] = buffer[buffer_offset];
	176	buffer_offset += 2;
	177	j += 2;
	178	name_offset++;
	179	}
	180
	181	buffer_offset += (l_attr + l_type + l_chksum);
	182	j = 0;
	183
	184	while (j != l_name_2 && !eof )
	185	{
	186	if ( (buffer[buffer_offset] == 0x00) \|\|
	187	(buffer[buffer_offset] == 0xFF) )
	188	{
	189	eof = 1;
	190	continue;
	191	}
	192	name[name_offset] = buffer[buffer_offset];
	193	buffer_offset += 2;
	194	j += 2;
	195	name_offset++;
	196	}
	197
	198	buffer_offset += l_rsvd;
	199	j = 0;
	200
	201	while (j != l_name_3 && !eof )
	202	{
	203	if ( (buffer[buffer_offset] == 0x00) \|\|
	204	(buffer[buffer_offset] == 0xFF) )
	205	{
	206	eof = 1;
	207	continue;
	208	}
	209	name[name_offset] = buffer[buffer_offset];
	210	buffer_offset += 2;
	211	j += 2;
	212	name_offset++;
	213	}
	214	}
	215	name[name_offset] = 0;
	216
	217	} // end get_name_from_long()
	218
[1]	219
[238]	220	//////////////////////////////////////////////////////////////////////////////////////////
[265]	221	// FATFS specific but extern functions
[238]	222	//////////////////////////////////////////////////////////////////////////////////////////
[1]	223
[265]	224	//////////////////////////////////////////////////////////////////////////////////////////
	225	void fatfs_ctx_display()
	226	{
	227	vfs_ctx_t * vfs_ctx = &fs_context[FS_TYPE_FATFS];
	228	fatfs_ctx_t * fatfs_ctx = (fatfs_ctx_t *)vfs_ctx->extend;
	229
	230	printk("\n* FAT context *\n"
	231	"- fat_sectors = %d\n"
	232	"- sector size = %d\n"
	233	"- cluster size = %d\n"
	234	"- fat_first_lba = %d\n"
	235	"- data_first_lba = %d\n"
	236	"- root_dir_cluster = %d\n"
	237	"- mapper_xp = %l\n",
	238	fatfs_ctx->fat_sectors_count,
	239	fatfs_ctx->bytes_per_sector,
	240	fatfs_ctx->sectors_per_cluster * fatfs_ctx->bytes_per_sector,
	241	fatfs_ctx->fat_begin_lba,
	242	fatfs_ctx->cluster_begin_lba,
	243	fatfs_ctx->root_dir_cluster,
	244	fatfs_ctx->fat_mapper_xp );
	245	}
	246
[238]	247	/////////////////////////////////////////////
	248	error_t fatfs_get_cluster( mapper_t * mapper,
[265]	249	uint32_t first_cluster_id,
	250	uint32_t page_index,
	251	uint32_t * searched_cluster_id )
[238]	252	{
	253	page_t * current_page_desc; // pointer on current page descriptor
	254	uint32_t * current_page_buffer; // pointer on current page (array of uint32_t)
	255	uint32_t current_page_index; // index of current page in mapper
	256	uint32_t current_page_offset; // offset of slot in current page
	257	uint32_t page_count_in_file; // index of page in file (index in linked list)
[265]	258	uint32_t current_cluster_id; // content of current FAT slot
[1]	259
[265]	260	assert( (page_index > 0) , __FUNCTION__ , "no FAT access required for first page\n");
[246]	261
[265]	262	fatfs_dmsg("\n[INFO] %s : enters / mapper = %x / first_cluster_id = %d / page_index = %d\n",
	263	__FUNCTION__ , first_cluster_id , page_index );
	264
	265	#if (CONFIG_FATFS_DEBUG > 1)
[246]	266	uint32_t * buf = (uint32_t *)ppm_page2vaddr( mapper_get_page ( mapper , 0 ) );
	267	uint32_t line , word;
[265]	268	printk("\n* FAT mapper content for first 256 entries *\n");
	269	for( line = 0 ; line < 16 ; line++ )
[246]	270	{
[265]	271	printk("%X : ", line );
[246]	272	for( word = 0 ; word < 16 ; word++ ) printk("%X ", buf[(line<<4) + word] );
	273	printk("\n");
	274	}
	275	#endif
	276
	277	// compute number of FAT slots per page
[238]	278	uint32_t slots_per_page = CONFIG_PPM_PAGE_SIZE >> 2;
[1]	279
[238]	280	// initialize loop variable
[265]	281	current_page_index = first_cluster_id / slots_per_page;
	282	current_page_offset = first_cluster_id % slots_per_page;
[238]	283	page_count_in_file = 0;
	284
	285	// scan FAT (i.e. traverse FAT linked list)
[265]	286	while( page_count_in_file <= page_index )
[238]	287	{
[246]	288
	289	fatfs_dmsg("\n[INFO] %s : page_index = %d / page_offset = %d / count = %d\n",
	290	__FUNCTION__ , current_page_index , current_page_offset , page_count_in_file );
	291
[238]	292	// get pointer on current page descriptor
	293	current_page_desc = mapper_get_page( mapper , current_page_index );
	294
	295	if( current_page_desc == NULL ) return EIO;
	296
	297	// get pointer on buffer for current page
[315]	298	xptr_t base_xp = ppm_page2base( XPTR( local_cxy , current_page_desc ) );
	299	current_page_buffer = (uint32_t *)GET_PTR( base_xp );
[238]	300
	301	// get FAT slot content
[265]	302	current_cluster_id = current_page_buffer[current_page_offset];
[238]	303
	304	// update loop variables
[265]	305	current_page_index = current_cluster_id / slots_per_page;
	306	current_page_offset = current_cluster_id % slots_per_page;
[238]	307	page_count_in_file++;
	308	}
	309
[246]	310	fatfs_dmsg("\n[INFO] %s : exit / cluster_id = %d\n",
[265]	311	__FUNCTION__ , current_cluster_id );
[246]	312
[265]	313	*searched_cluster_id = current_cluster_id;
[238]	314	return 0;
	315
	316	} // end fatfs_get_cluster()
	317
	318
	319
[1]	320	///////////////////////////////////////////////////////////////////////////////////////
[238]	321	// Generic API : the following functions are called by the kernel (VFS)
[188]	322	// and must be defined by all supported file systems.
[1]	323	///////////////////////////////////////////////////////////////////////////////////////
	324
[188]	325	///////////////////////////////
	326	fatfs_ctx_t * fatfs_ctx_alloc()
[1]	327	{
[23]	328	kmem_req_t req;
[188]	329	req.type = KMEM_FATFS_CTX;
	330	req.size = sizeof(fatfs_ctx_t);
	331	req.flags = AF_KERNEL \| AF_ZERO;
[1]	332
[188]	333	return (fatfs_ctx_t *)kmem_alloc( &req );
	334	}
[23]	335
[188]	336	//////////////////////////////////////////////
	337	void fatfs_ctx_init( fatfs_ctx_t * fatfs_ctx )
	338	{
	339	error_t error;
	340	kmem_req_t req;
	341	uint8_t * buffer;
[23]	342
[279]	343	fatfs_dmsg("\n[INFO] %s : enter for fatfs_ctx = %x\n",
[246]	344	__FUNCTION__ , fatfs_ctx );
[23]	345
[246]	346	assert( (fatfs_ctx != NULL) , __FUNCTION__ ,
[188]	347	"cannot allocate memory for FATFS context\n" );
[23]	348
[50]	349	// allocate a 512 bytes buffer to store the boot record
	350	req.type = KMEM_512_BYTES;
	351	req.flags = AF_KERNEL \| AF_ZERO;
	352	buffer = (uint8_t *)kmem_alloc( &req );
[188]	353
[246]	354	assert( (buffer != NULL) , __FUNCTION__ ,
[188]	355	"cannot allocate memory for 512 bytes buffer\n" );
[50]	356
[279]	357	fatfs_dmsg("\n[INFO] %s : allocated 512 bytes buffer\n", __FUNCTION__ );
	358
[50]	359	// load the boot record from device
	360	// using a synchronous access to IOC device
[23]	361	error = dev_ioc_sync_read( buffer , 0 , 1 );
	362
[279]	363	fatfs_dmsg("\n[INFO] %s : buffer loaded\n", __FUNCTION__ );
	364
[246]	365	assert( (error == 0) , __FUNCTION__ ,
[188]	366	"cannot access boot record\n" );
[50]	367
[246]	368	#if (CONFIG_FATFS_DEBUG > 1)
[50]	369	uint32_t line;
	370	uint32_t byte = 0;
[101]	371	printk("\n* boot record at cycle %d *\n", hal_get_cycles() );
[50]	372	for ( line = 0 ; line < 32 ; line++ )
	373	{
	374	printk(" %X \| %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x \|\n",
	375	byte,
	376	buffer[byte+ 0],buffer[byte+ 1],buffer[byte+ 2],buffer[byte+ 3],
	377	buffer[byte+ 4],buffer[byte+ 5],buffer[byte+ 6],buffer[byte+ 7],
	378	buffer[byte+ 8],buffer[byte+ 9],buffer[byte+10],buffer[byte+11],
	379	buffer[byte+12],buffer[byte+13],buffer[byte+14],buffer[byte+15] );
	380
	381	byte += 16;
	382	}
	383	#endif
	384
[23]	385	// check sector size from boot record
[238]	386	uint32_t sector_size = fatfs_get_record( BPB_BYTSPERSEC , buffer , 1 );
[50]	387
[279]	388	assert( (sector_size == 512) , __FUNCTION__ ,
	389	"sector size must be 512 bytes\n" );
[23]	390
	391	// check cluster size from boot record
[238]	392	uint32_t nb_sectors = fatfs_get_record( BPB_SECPERCLUS , buffer , 1 );
[50]	393
[279]	394	assert( (nb_sectors == 8) , __FUNCTION__ ,
	395	"cluster size must be 8 sectors\n" );
[23]	396
	397	// check number of FAT copies from boot record
[238]	398	uint32_t nb_fats = fatfs_get_record( BPB_NUMFATS , buffer , 1 );
[50]	399
[279]	400	assert( (nb_fats == 1) , __FUNCTION__ ,
	401	"number of FAT copies must be 1\n" );
[23]	402
	403	// get & check number of sectors in FAT from boot record
[238]	404	uint32_t fat_sectors = fatfs_get_record( BPB_FAT32_FATSZ32 , buffer , 1 );
[50]	405
[279]	406	assert( ((fat_sectors & 0xF) == 0) , __FUNCTION__ ,
	407	"FAT not multiple of 16 sectors\n");
[23]	408
	409	// get and check root cluster from boot record
[238]	410	uint32_t root_cluster = fatfs_get_record( BPB_FAT32_ROOTCLUS , buffer , 1 );
[50]	411
[279]	412	assert( (root_cluster == 2) , __FUNCTION__ ,
	413	"root cluster index must be 2\n");
[23]	414
	415	// get FAT lba from boot record
[238]	416	uint32_t fat_lba = fatfs_get_record( BPB_RSVDSECCNT , buffer , 1 );
[50]	417
	418	// release the 512 bytes buffer
	419	req.type = KMEM_512_BYTES;
	420	req.ptr = buffer;
	421	kmem_free( &req );
	422
[279]	423	fatfs_dmsg("\n[INFO] %s : boot record read & released\n",
	424	__FUNCTION__ );
	425
[23]	426	// allocate a mapper for the FAT itself
[246]	427	mapper_t * fat_mapper = mapper_create( FS_TYPE_FATFS );
[50]	428
[23]	429	assert( (fat_mapper != NULL) , __FUNCTION__ , "no memory for FAT mapper" );
	430
[246]	431	// WARNING : the inode field MUST be NULL for the FAT mapper
	432	fat_mapper->inode = NULL;
	433
[23]	434	// initialize the FATFS context
	435	fatfs_ctx->fat_begin_lba = fat_lba;
	436	fatfs_ctx->fat_sectors_count = fat_sectors;
	437	fatfs_ctx->bytes_per_sector = sector_size;
[188]	438	fatfs_ctx->sectors_per_cluster = nb_sectors;
[23]	439	fatfs_ctx->cluster_begin_lba = fat_lba + fat_sectors;
	440	fatfs_ctx->root_dir_cluster = 2;
	441	fatfs_ctx->last_allocated_sector = 0; // TODO ???
	442	fatfs_ctx->last_allocated_index = 0; // TODO ???
	443	fatfs_ctx->fat_mapper_xp = XPTR( local_cxy , fat_mapper );
	444
[279]	445	fatfs_dmsg("\n[INFO] %s : exit for fatfs_ctx = %x\n",
	446	__FUNCTION__ , fatfs_ctx );
	447
[23]	448	} // end fatfs_ctx_init()
	449
[188]	450	/////////////////////////////////////////////////
	451	void fatfs_ctx_destroy( fatfs_ctx_t * fatfs_ctx )
[23]	452	{
	453	kmem_req_t req;
[188]	454	req.type = KMEM_FATFS_CTX;
[23]	455	req.ptr = fatfs_ctx;
	456	kmem_free( &req );
	457	}
	458
[246]	459	//////////////////////////////////////////////
	460	error_t fatfs_mapper_move_page( page_t * page,
	461	bool_t to_mapper )
[1]	462	{
[246]	463	error_t error;
	464
[1]	465	// get pointer on source mapper and page index from page descriptor
[246]	466	mapper_t * mapper = page->mapper;
	467	uint32_t index = page->index;
[1]	468
	469	// get VFS inode pointer from mapper
[246]	470	vfs_inode_t * inode = mapper->inode;
[1]	471
[246]	472	fatfs_dmsg("\n[INFO] %s : enter for inode %x / page_index = %d / mapper = %x\n",
	473	__FUNCTION__ , inode , index , mapper );
[1]	474
[246]	475	// get memory buffer base address
[315]	476	xptr_t base_xp = ppm_page2base( XPTR( local_cxy , page ) );
	477	uint8_t * buffer = (uint8_t *)GET_PTR( base_xp );
[246]	478
	479	// get number of sectors from FATFS context
[188]	480	fatfs_ctx_t * fatfs_ctx = (fatfs_ctx_t *)fs_context[FS_TYPE_FATFS].extend;
[1]	481	uint32_t count = fatfs_ctx->sectors_per_cluster;
	482
[246]	483	// analyse the mapper type : FAT or normal inode
	484	if( inode == NULL ) // it is the FAT mapper
	485	{
	486	// get lba from page index
	487	uint32_t lba = fatfs_ctx->fat_begin_lba + (count * index);
	488
	489	fatfs_dmsg("\n[INFO] %s : for FAT / lba = %d\n",
	490	__FUNCTION__ , lba );
[1]	491
[246]	492	// access device
	493	if( to_mapper ) error = dev_ioc_sync_read ( buffer , lba , count );
	494	else error = dev_ioc_write( buffer , lba , count );
[1]	495
[246]	496	if( error ) return EIO;
[1]	497
[246]	498	fatfs_dmsg("\n[INFO] %s : exit for FAT / page_index = %d / mapper = %x\n",
	499	__FUNCTION__ , index , mapper );
	500	}
	501	else // it is a normal inode mapper
[1]	502	{
[265]	503	uint32_t searched_cluster_id;
[1]	504
[265]	505	// get first_cluster_id from inode extension
	506	uint32_t first_cluster_id = (uint32_t)(intptr_t)inode->extend;
[246]	507
[265]	508	fatfs_dmsg("\n[INFO] %s : for inode %x / first_cluster_id = %d\n",
	509	__FUNCTION__ , inode , first_cluster_id );
[246]	510
[265]	511	// compute cluster_id
	512	if( index == 0 ) // no need to access FAT mapper
	513	{
	514	searched_cluster_id = first_cluster_id;
	515	}
	516	else // FAT mapper access required
	517	{
	518	// get cluster and local pointer on FAT mapper
	519	xptr_t fat_mapper_xp = fatfs_ctx->fat_mapper_xp;
	520	cxy_t fat_mapper_cxy = GET_CXY( fat_mapper_xp );
	521	mapper_t * fat_mapper_ptr = (mapper_t *)GET_PTR( fat_mapper_xp );
	522
	523	// access FAT mapper
	524	if( fat_mapper_cxy == local_cxy ) // FAT mapper is local
	525	{
	526	error = fatfs_get_cluster( fat_mapper_ptr,
	527	first_cluster_id,
	528	index,
	529	&searched_cluster_id );
	530	}
	531	else // FAT mapper is remote
	532	{
	533	rpc_fatfs_get_cluster_client( fat_mapper_cxy,
	534	fat_mapper_ptr,
	535	first_cluster_id,
	536	index,
	537	&searched_cluster_id,
	538	&error );
	539	}
	540
	541	if( error ) return EIO;
	542	}
	543
	544	// get lba from cluster_id
	545	uint32_t lba = fatfs_lba_from_cluster( fatfs_ctx , searched_cluster_id );
	546
[246]	547	fatfs_dmsg("\n[INFO] %s : for inode %x / page = %d / cluster_id = %d / lba = %x\n",
[265]	548	__FUNCTION__ , inode , index , searched_cluster_id , lba );
[246]	549
	550	// access device
	551	if( to_mapper ) error = dev_ioc_sync_read ( buffer , lba , count );
	552	else error = dev_ioc_write( buffer , lba , count );
	553
	554	if( error ) return EIO;
	555
	556	fatfs_dmsg("\n[INFO] %s : exit for inode %x / page = %x / mapper = %x\n",
	557	__FUNCTION__ , inode , page , mapper );
	558	}
	559
[1]	560	return 0;
	561
[246]	562	} // end fatfs_mapper_move_page()
	563
[265]	564	/////////////////////////////////////////////////////
[238]	565	error_t fatfs_inode_load( vfs_inode_t * parent_inode,
	566	char * name,
	567	xptr_t child_inode_xp )
[1]	568	{
[238]	569	// Two embedded loops:
	570	// - scan the parent mapper pages
	571	// - scan the directory entries in each 4 Kbytes page
[1]	572
[238]	573	fatfs_dmsg("\n[INFO] %s : enter for child <%s> in parent inode %l\n",
[246]	574	__FUNCTION__ , name , XPTR( local_cxy , parent_inode ) );
[1]	575
[238]	576	mapper_t * mapper = parent_inode->mapper;
	577
	578	assert( (mapper != NULL) , __FUNCTION__ , "parent mapper undefined\n");
	579
	580	char cname[CONFIG_VFS_MAX_NAME_LENGTH]; // name extracter from each directory entry
	581
	582	char lfn1[16]; // buffer for one partial cname
	583	char lfn2[16]; // buffer for one partial cname
	584	char lfn3[16]; // buffer for one partial cname
	585	page_t * page; // pointer on current page descriptor
	586	uint8_t * base; // pointer on current page base
	587	uint32_t offset = 0; // byte offset in page
	588	uint32_t index = 0; // page index in mapper
	589	uint32_t attr; // directory entry ATTR field
	590	uint32_t ord; // directory entry ORD field
	591	uint32_t seq; // sequence index
	592	uint32_t lfn = 0; // LFN entries number
	593	uint32_t size = 0; // searched file/dir size (bytes)
	594	uint32_t cluster = 0; // searched file/dir cluster index
	595	uint32_t is_dir = 0; // searched file/dir type
	596	uint32_t dentry; // directory entry index
	597	int32_t found = 0; // not found (0) / name found (1) / end of dir (-1)
	598
	599	// scan the parent directory mapper
	600	while ( found == 0 )
	601	{
	602	// get one page
	603	page = mapper_get_page( mapper , index );
	604
	605	assert( (page != NULL) , __FUNCTION__ , "bad parent mapper\n");
	606
	607	// get page base
[315]	608	xptr_t base_xp = ppm_page2base( XPTR( local_cxy , page ) );
	609	base = (uint8_t *)GET_PTR( base_xp );
[238]	610
[265]	611	#if (CONFIG_FATFS_DEBUG > 1)
	612	uint32_t * buf = (uint32_t *)base;
	613	uint32_t line , word;
	614	printk("\n* DIRECTORY content for first 16 entries *\n");
	615	for( line = 0 ; line < 16 ; line++ )
	616	{
	617	printk("%X : ", line );
	618	for( word = 0 ; word < 8 ; word++ ) printk("%X ", buf[(line<<4) + word] );
	619	printk("\n");
	620	}
	621	#endif
	622
	623
[238]	624	// scan this page until end of directory, end of page, or name found
	625	while( (offset < 4096) && (found == 0) )
	626	{
	627	attr = fatfs_get_record( DIR_ATTR , base + offset , 0 );
	628	ord = fatfs_get_record( LDIR_ORD , base + offset , 0 );
	629
	630	if (ord == NO_MORE_ENTRY) // no more entry => break
	631	{
	632	found = -1;
	633	}
	634	else if ( ord == FREE_ENTRY ) // free entry => skip
	635	{
	636	offset = offset + 32;
	637	}
	638	else if ( attr == ATTR_LONG_NAME_MASK ) // LFN entry => get partial cname
	639	{
	640	seq = ord & 0x3;
	641	lfn = (seq > lfn) ? seq : lfn;
	642	if ( seq == 1 ) fatfs_get_name_from_long( base + offset, lfn1 );
	643	else if ( seq == 2 ) fatfs_get_name_from_long( base + offset, lfn2 );
	644	else if ( seq == 3 ) fatfs_get_name_from_long( base + offset, lfn3 );
	645	offset = offset + 32;
	646	}
	647	else // NORMAL entry
	648	{
	649	// build the extracted name
	650	if ( lfn == 0 )
	651	{
	652	fatfs_get_name_from_short( base + offset , cname );
	653	}
	654	else if ( lfn == 1 )
	655	{
	656	strcpy( cname , lfn1 );
	657	}
	658	else if ( lfn == 2 )
	659	{
	660	strcpy( cname , lfn1 );
	661	strcpy( cname + 13 , lfn2 );
	662	}
	663	else if ( lfn == 3 )
	664	{
	665	strcpy( cname , lfn1 );
	666	strcpy( cname + 13 , lfn2 );
	667	strcpy( cname + 26 , lfn3 );
	668	}
	669
	670	// get dentry arguments if extracted cname == searched name
	671	if ( strcmp( name , cname ) == 0 )
	672	{
	673	cluster = (fatfs_get_record( DIR_FST_CLUS_HI , base + offset , 1 ) << 16) \|
	674	(fatfs_get_record( DIR_FST_CLUS_LO , base + offset , 1 ) ) ;
	675	dentry = ((index<<12) + offset)>>5;
	676	is_dir = ((attr & ATTR_DIRECTORY) == ATTR_DIRECTORY);
	677	size = fatfs_get_record( DIR_FILE_SIZE , base + offset , 1 );
	678	found = 1;
	679	}
	680	offset = offset + 32;
	681	lfn = 0;
	682	}
	683	} // end loop on directory entries
	684	index++;
	685	offset = 0;
	686	} // end loop on pages
	687
	688	// analyse the result of scan
	689
	690	if ( found == -1 ) // found end of directory => failure
	691	{
[246]	692	fatfs_dmsg("\n[INFO] %s : exit / child <%s> not found in parent inode %l\n",
	693	__FUNCTION__ , name , XPTR( local_cxy , parent_inode ) );
[238]	694
	695	return ENOENT;
	696	}
	697	else // found searched child name
	698	{
	699	// get child inode cluster and local pointer
	700	cxy_t child_cxy = GET_CXY( child_inode_xp );
	701	vfs_inode_t * child_ptr = (vfs_inode_t *)GET_PTR( child_inode_xp );
	702
	703	// update the child inode "type", "size", and "extend" fields
	704	vfs_inode_type_t type = (is_dir) ? INODE_TYPE_DIR : INODE_TYPE_FILE;
	705
	706	hal_remote_sw( XPTR( child_cxy , &child_ptr->type ) , type );
	707	hal_remote_sw( XPTR( child_cxy , &child_ptr->size ) , size );
	708	hal_remote_sw( XPTR( child_cxy , &child_ptr->extend ) , cluster );
	709
[246]	710	fatfs_dmsg("\n[INFO] %s : exit / child <%s> found in parent inode %l\n",
	711	__FUNCTION__ , name , XPTR( local_cxy , parent_inode ) );
	712
[238]	713	return 0;
	714	}
	715	} // end fatfs_inode_load()

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