support to read/write FS info sector for FAT32 partitions. speeds up statvfs. patch submitted by dimok

This commit is contained in:
tantricity 2011-01-16 19:03:37 +00:00
parent 875d47b8f3
commit 93ec6aad6a
5 changed files with 206 additions and 77 deletions

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@ -1 +1 @@
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@ -465,7 +465,16 @@ int _FAT_statvfs_r (struct _reent *r, const char *path, struct statvfs *buf)
_FAT_lock(&partition->lock); _FAT_lock(&partition->lock);
freeClusterCount = _FAT_fat_freeClusterCount (partition); if(memcmp(&buf->f_flag, "SCAN", 4) == 0)
{
//Special command was given to sync the numberFreeCluster
_FAT_partition_createFSinfo(partition);
}
if(partition->filesysType == FS_FAT32)
freeClusterCount = partition->fat.numberFreeCluster;
else
freeClusterCount = _FAT_fat_freeClusterCount (partition);
// FAT clusters = POSIX blocks // FAT clusters = POSIX blocks
buf->f_bsize = partition->bytesPerCluster; // File system block size. buf->f_bsize = partition->bytesPerCluster; // File system block size.

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@ -245,6 +245,9 @@ uint32_t _FAT_fat_linkFreeCluster(PARTITION* partition, uint32_t cluster) {
} }
} }
partition->fat.firstFree = firstFree; partition->fat.firstFree = firstFree;
if(partition->fat.numberFreeCluster)
partition->fat.numberFreeCluster--;
partition->fat.numberLastAllocCluster = firstFree;
if ((cluster >= CLUSTER_FIRST) && (cluster <= lastCluster)) if ((cluster >= CLUSTER_FIRST) && (cluster <= lastCluster))
{ {
@ -309,6 +312,8 @@ bool _FAT_fat_clearLinks (PARTITION* partition, uint32_t cluster) {
// Erase the link // Erase the link
_FAT_fat_writeFatEntry (partition, cluster, CLUSTER_FREE); _FAT_fat_writeFatEntry (partition, cluster, CLUSTER_FREE);
if(partition->fat.numberFreeCluster < (partition->numberOfSectors/partition->sectorsPerCluster))
partition->fat.numberFreeCluster++;
// Move onto next cluster // Move onto next cluster
cluster = nextCluster; cluster = nextCluster;
} }

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@ -93,7 +93,20 @@ enum BPB {
BPB_bootSig_AA = 0x1FF BPB_bootSig_AA = 0x1FF
}; };
// File system information block offsets
enum FSIB
{
FSIB_SIG1 = 0x00,
FSIB_SIG2 = 0x1e4,
FSIB_numberOfFreeCluster = 0x1e8,
FSIB_numberLastAllocCluster = 0x1ec,
FSIB_bootSig_55 = 0x1FE,
FSIB_bootSig_AA = 0x1FF
};
static const char FAT_SIG[3] = {'F', 'A', 'T'}; static const char FAT_SIG[3] = {'F', 'A', 'T'};
static const char FS_INFO_SIG1[4] = {'R', 'R', 'a', 'A'};
static const char FS_INFO_SIG2[4] = {'r', 'r', 'A', 'a'};
sec_t FindFirstValidPartition(const DISC_INTERFACE* disc) sec_t FindFirstValidPartition(const DISC_INTERFACE* disc)
@ -230,10 +243,15 @@ PARTITION* _FAT_partition_constructor (const DISC_INTERFACE* disc, uint32_t cach
partition->totalSize = ((uint64_t)partition->numberOfSectors - (partition->dataStart - startSector)) * (uint64_t)partition->bytesPerSector; partition->totalSize = ((uint64_t)partition->numberOfSectors - (partition->dataStart - startSector)) * (uint64_t)partition->bytesPerSector;
//FS info sector
partition->fsInfoSector = startSector + (u8array_to_u16(sectorBuffer, BPB_FAT32_fsInfo) ? u8array_to_u16(sectorBuffer, BPB_FAT32_fsInfo) : 1);
// Store info about FAT // Store info about FAT
uint32_t clusterCount = (partition->numberOfSectors - (uint32_t)(partition->dataStart - startSector)) / partition->sectorsPerCluster; uint32_t clusterCount = (partition->numberOfSectors - (uint32_t)(partition->dataStart - startSector)) / partition->sectorsPerCluster;
partition->fat.lastCluster = clusterCount + CLUSTER_FIRST - 1; partition->fat.lastCluster = clusterCount + CLUSTER_FIRST - 1;
partition->fat.firstFree = CLUSTER_FIRST; partition->fat.firstFree = CLUSTER_FIRST;
partition->fat.numberFreeCluster = 0;
partition->fat.numberLastAllocCluster = 0;
if (clusterCount < CLUSTERS_PER_FAT12) { if (clusterCount < CLUSTERS_PER_FAT12) {
partition->filesysType = FS_FAT12; // FAT12 volume partition->filesysType = FS_FAT12; // FAT12 volume
@ -268,6 +286,8 @@ PARTITION* _FAT_partition_constructor (const DISC_INTERFACE* disc, uint32_t cach
partition->openFileCount = 0; partition->openFileCount = 0;
partition->firstOpenFile = NULL; partition->firstOpenFile = NULL;
_FAT_partition_readFSinfo(partition);
return partition; return partition;
} }
@ -283,6 +303,9 @@ void _FAT_partition_destructor (PARTITION* partition) {
nextFile = nextFile->nextOpenFile; nextFile = nextFile->nextOpenFile;
} }
// Write out the fs info sector
_FAT_partition_writeFSinfo(partition);
// Free memory used by the cache, writing it to disc at the same time // Free memory used by the cache, writing it to disc at the same time
_FAT_cache_destructor (partition->cache); _FAT_cache_destructor (partition->cache);
@ -305,3 +328,77 @@ PARTITION* _FAT_partition_getPartitionFromPath (const char* path) {
return (PARTITION*)devops->deviceData; return (PARTITION*)devops->deviceData;
} }
void _FAT_partition_createFSinfo(PARTITION * partition)
{
if(partition->readOnly || partition->filesysType != FS_FAT32)
return;
uint8_t sectorBuffer[BYTES_PER_READ];
memset(sectorBuffer, 0, sizeof(sectorBuffer));
int i;
for(i = 0; i < 4; ++i)
{
sectorBuffer[FSIB_SIG1+i] = FS_INFO_SIG1[i];
sectorBuffer[FSIB_SIG2+i] = FS_INFO_SIG2[i];
}
partition->fat.numberFreeCluster = _FAT_fat_freeClusterCount(partition);
u32_to_u8array(sectorBuffer, FSIB_numberOfFreeCluster, partition->fat.numberFreeCluster);
u32_to_u8array(sectorBuffer, FSIB_numberLastAllocCluster, partition->fat.numberLastAllocCluster);
sectorBuffer[FSIB_bootSig_55] = 0x55;
sectorBuffer[FSIB_bootSig_AA] = 0xAA;
_FAT_disc_writeSectors (partition->disc, partition->fsInfoSector, 1, sectorBuffer);
}
void _FAT_partition_readFSinfo(PARTITION * partition)
{
if(partition->filesysType != FS_FAT32)
return;
uint8_t sectorBuffer[BYTES_PER_READ] = {0};
// Read first sector of disc
if (!_FAT_disc_readSectors (partition->disc, partition->fsInfoSector, 1, sectorBuffer)) {
return;
}
if(memcmp(sectorBuffer+FSIB_SIG1, FS_INFO_SIG1, 4) != 0 ||
memcmp(sectorBuffer+FSIB_SIG2, FS_INFO_SIG2, 4) != 0 ||
u8array_to_u32(sectorBuffer, FSIB_numberOfFreeCluster) == 0)
{
//sector does not yet exist, create one!
_FAT_partition_createFSinfo(partition);
return;
}
partition->fat.numberFreeCluster = u8array_to_u32(sectorBuffer, FSIB_numberOfFreeCluster);
partition->fat.numberLastAllocCluster = u8array_to_u32(sectorBuffer, FSIB_numberLastAllocCluster);
}
void _FAT_partition_writeFSinfo(PARTITION * partition)
{
if(partition->filesysType != FS_FAT32)
return;
uint8_t sectorBuffer[BYTES_PER_READ] = {0};
// Read first sector of disc
if (!_FAT_disc_readSectors (partition->disc, partition->fsInfoSector, 1, sectorBuffer)) {
return;
}
if(memcmp(sectorBuffer+FSIB_SIG1, FS_INFO_SIG1, 4) || memcmp(sectorBuffer+FSIB_SIG2, FS_INFO_SIG2, 4))
return;
u32_to_u8array(sectorBuffer, FSIB_numberOfFreeCluster, partition->fat.numberFreeCluster);
u32_to_u8array(sectorBuffer, FSIB_numberLastAllocCluster, partition->fat.numberLastAllocCluster);
// Read first sector of disc
if (!_FAT_disc_writeSectors (partition->disc, partition->fsInfoSector, 1, sectorBuffer)) {
return;
}
}

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@ -45,6 +45,8 @@ typedef struct {
uint32_t sectorsPerFat; uint32_t sectorsPerFat;
uint32_t lastCluster; uint32_t lastCluster;
uint32_t firstFree; uint32_t firstFree;
uint32_t numberFreeCluster;
uint32_t numberLastAllocCluster;
} FAT; } FAT;
typedef struct { typedef struct {
@ -60,6 +62,7 @@ typedef struct {
uint32_t bytesPerSector; uint32_t bytesPerSector;
uint32_t sectorsPerCluster; uint32_t sectorsPerCluster;
uint32_t bytesPerCluster; uint32_t bytesPerCluster;
uint32_t fsInfoSector;
FAT fat; FAT fat;
// Values that may change after construction // Values that may change after construction
uint32_t cwdCluster; // Current working directory cluster uint32_t cwdCluster; // Current working directory cluster
@ -86,4 +89,19 @@ Return the partition specified in a path, as taken from the devoptab.
*/ */
PARTITION* _FAT_partition_getPartitionFromPath (const char* path); PARTITION* _FAT_partition_getPartitionFromPath (const char* path);
/*
Create the fs info sector.
*/
void _FAT_partition_createFSinfo(PARTITION * partition);
/*
Read the fs info sector data.
*/
void _FAT_partition_readFSinfo(PARTITION * partition);
/*
Write the fs info sector data.
*/
void _FAT_partition_writeFSinfo(PARTITION * partition);
#endif // _PARTITION_H #endif // _PARTITION_H