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Greg's improved fat_cache_sector() function, now updates the second FAT

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@2814 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Linus Nielsen Feltzing 2002-11-09 09:23:43 +00:00
parent 81449d9642
commit 4382c68b3f
1 changed files with 25 additions and 15 deletions
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38
firmware/drivers/fat.c
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@ -392,40 +392,50 @@ static void *cache_fat_sector(int fatsector)
{
int secnum = fatsector + fat_bpb.bpb_rsvdseccnt;
int cache_index = secnum & FAT_CACHE_MASK;
struct fat_cache_entry *fce = &fat_cache[cache_index];
unsigned char *sectorbuf = &fat_cache_sectors[cache_index][0];
/* Delete the cache entry if it isn't the sector we want */
if(fat_cache[cache_index].inuse &&
fat_cache[cache_index].secnum != secnum)
if(fce->inuse && fce->secnum != secnum)
{
/* Write back if it is dirty */
if(fat_cache[cache_index].dirty)
if(fce->dirty)
{
if(ata_write_sectors(fat_cache[cache_index].secnum +
fat_bpb.startsector, 1,
fat_cache_sectors[cache_index]))
if(ata_write_sectors(fce->secnum+fat_bpb.startsector, 1,
sectorbuf))
{
panicf("cache_fat_sector() - Could not write sector %d\n",
secnum);
}
if(fat_bpb.bpb_numfats > 1)
{
/* Write to the second FAT */
if(ata_write_sectors(fce->secnum+fat_bpb.startsector+
fat_bpb.fatsize, 1, sectorbuf))
{
panicf("cache_fat_sector() - Could not write sector %d\n",
secnum + fat_bpb.fatsize);
}
fat_cache[cache_index].secnum = 8; /* Normally an unused sector */
fat_cache[cache_index].dirty = false;
fat_cache[cache_index].inuse = false;
}
}
fce->secnum = 8; /* Normally an unused sector */
fce->dirty = false;
fce->inuse = false;
}
/* Load the sector if it is not cached */
if(!fat_cache[cache_index].inuse)
if(!fce->inuse)
{
if(ata_read_sectors(secnum + fat_bpb.startsector,1,
fat_cache_sectors[cache_index]))
sectorbuf))
{
DEBUGF( "cache_fat_sector() - Could not read sector %d\n", secnum);
return NULL;
}
fat_cache[cache_index].inuse = true;
fat_cache[cache_index].secnum = secnum;
fce->inuse = true;
fce->secnum = secnum;
}
return fat_cache_sectors[cache_index];
return sectorbuf;
}
static int find_free_cluster(int startcluster)