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https://github.com/wiiu-env/libfat.git
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support to read/write FS info sector for FAT32 partitions. speeds up statvfs. patch submitted by dimok
This commit is contained in:
tantricity
parent
875d47b8f3
commit
93ec6aad6a
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@ -1 +1 @@
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<Project name="libfat"><MagicFolder excludeFolders="CVS;.svn" filter="*.c;*.h" name="source" path="source\"><MagicFolder excludeFolders="CVS;.svn" filter="*.c;*.h" name="disc_io" path="disc_io\"><File path="disc.c"></File><File path="io_cf_common.c"></File><File path="io_cf_common.h"></File><File path="io_dldi.h"></File><File path="io_efa2.c"></File><File path="io_efa2.h"></File><File path="io_fcsr.c"></File><File path="io_fcsr.h"></File><File path="io_m3cf.c"></File><File path="io_m3cf.h"></File><File path="io_m3sd.c"></File><File path="io_m3sd.h"></File><File path="io_m3_common.c"></File><File path="io_m3_common.h"></File><File path="io_mpcf.c"></File><File path="io_mpcf.h"></File><File path="io_njsd.c"></File><File path="io_njsd.h"></File><File path="io_nmmc.c"></File><File path="io_nmmc.h"></File><File path="io_sccf.c"></File><File path="io_sccf.h"></File><File path="io_scsd.c"></File><File path="io_scsd.h"></File><File path="io_sc_common.c"></File><File path="io_sc_common.h"></File><File path="io_sd_common.c"></File><File path="io_sd_common.h"></File></MagicFolder><MagicFolder excludeFolders="CVS;.svn" filter="*.c;*.h" name="ogc_io" path="ogc_io\"><File path="disc.c"></File><File path="gcsd.c"></File><File path="gcsd.h"></File><File path="wiisd.c"></File><File path="wiisd.h"></File></MagicFolder><File path="bit_ops.h"></File><File path="cache.c"></File><File path="cache.h"></File><File path="common.h"></File><File path="directory.c"></File><File path="directory.h"></File><File path="disc.h"></File><File path="fatdir.c"></File><File path="fatdir.h"></File><File path="fatfile.c"></File><File path="fatfile.h"></File><File path="filetime.c"></File><File path="filetime.h"></File><File path="file_allocation_table.c"></File><File path="file_allocation_table.h"></File><File path="libfat.c"></File><File path="mem_allocate.h"></File><File path="partition.c"></File><File path="partition.h"></File></MagicFolder><Folder name="nds"><Folder name="include"><File path="nds\include\fat.h"></File><File path="nds\include\nitrofs.h"></File></Folder><Folder name="source"><File path="nds\source\nitrofs.c"></File></Folder><File path="nds\Makefile"></File></Folder><Folder name="libogc"><Folder name="include"><File path="libogc\include\fat.h"></File></Folder><File path="libogc\Makefile"></File></Folder><Folder name="gba"><Folder name="include"><File path="gba\include\fat.h"></File></Folder><File path="gba\Makefile"></File></Folder><MagicFolder excludeFolders="CVS;.svn" filter="*.h" name="include" path="include\"><File path="fat.h"></File></MagicFolder><File path="Makefile"></File></Project>
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<Project name="libfat"><MagicFolder excludeFolders="CVS;.svn" filter="*.c;*.h" name="source" path="source\"><File path="bit_ops.h"></File><File path="cache.c"></File><File path="cache.h"></File><File path="common.h"></File><File path="directory.c"></File><File path="directory.h"></File><File path="disc.c"></File><File path="disc.h"></File><File path="fatdir.c"></File><File path="fatdir.h"></File><File path="fatfile.c"></File><File path="fatfile.h"></File><File path="filetime.c"></File><File path="filetime.h"></File><File path="file_allocation_table.c"></File><File path="file_allocation_table.h"></File><File path="libfat.c"></File><File path="lock.c"></File><File path="lock.h"></File><File path="mem_allocate.h"></File><File path="partition.c"></File><File path="partition.h"></File></MagicFolder><Folder name="nds"><Folder name="include"><File path="nds\include\fat.h"></File><File path="nds\include\nitrofs.h"></File></Folder><Folder name="source"><File path="nds\source\nitrofs.c"></File></Folder><File path="nds\Makefile"></File></Folder><Folder name="libogc"><Folder name="include"><File path="libogc\include\fat.h"></File></Folder><File path="libogc\Makefile"></File></Folder><Folder name="gba"><Folder name="include"><File path="gba\include\fat.h"></File></Folder><File path="gba\Makefile"></File></Folder><MagicFolder excludeFolders="CVS;.svn" filter="*.h" name="include" path="include\"><File path="fat.h"></File><File path="libfatversion.h"></File></MagicFolder><File path="Makefile"></File></Project>
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@ -465,7 +465,16 @@ int _FAT_statvfs_r (struct _reent *r, const char *path, struct statvfs *buf)
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_FAT_lock(&partition->lock);
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freeClusterCount = _FAT_fat_freeClusterCount (partition);
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if(memcmp(&buf->f_flag, "SCAN", 4) == 0)
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{
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//Special command was given to sync the numberFreeCluster
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_FAT_partition_createFSinfo(partition);
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}
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if(partition->filesysType == FS_FAT32)
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freeClusterCount = partition->fat.numberFreeCluster;
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else
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freeClusterCount = _FAT_fat_freeClusterCount (partition);
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// FAT clusters = POSIX blocks
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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) {
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}
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}
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partition->fat.firstFree = firstFree;
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if(partition->fat.numberFreeCluster)
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partition->fat.numberFreeCluster--;
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partition->fat.numberLastAllocCluster = firstFree;
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if ((cluster >= CLUSTER_FIRST) && (cluster <= lastCluster))
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{
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@ -309,6 +312,8 @@ bool _FAT_fat_clearLinks (PARTITION* partition, uint32_t cluster) {
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// Erase the link
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_FAT_fat_writeFatEntry (partition, cluster, CLUSTER_FREE);
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if(partition->fat.numberFreeCluster < (partition->numberOfSectors/partition->sectorsPerCluster))
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partition->fat.numberFreeCluster++;
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// Move onto next cluster
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cluster = nextCluster;
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}
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@ -93,7 +93,20 @@ enum BPB {
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BPB_bootSig_AA = 0x1FF
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};
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// File system information block offsets
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enum FSIB
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{
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FSIB_SIG1 = 0x00,
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FSIB_SIG2 = 0x1e4,
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FSIB_numberOfFreeCluster = 0x1e8,
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FSIB_numberLastAllocCluster = 0x1ec,
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FSIB_bootSig_55 = 0x1FE,
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FSIB_bootSig_AA = 0x1FF
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};
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static const char FAT_SIG[3] = {'F', 'A', 'T'};
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static const char FS_INFO_SIG1[4] = {'R', 'R', 'a', 'A'};
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static const char FS_INFO_SIG2[4] = {'r', 'r', 'A', 'a'};
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sec_t FindFirstValidPartition(const DISC_INTERFACE* disc)
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@ -230,10 +243,15 @@ PARTITION* _FAT_partition_constructor (const DISC_INTERFACE* disc, uint32_t cach
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partition->totalSize = ((uint64_t)partition->numberOfSectors - (partition->dataStart - startSector)) * (uint64_t)partition->bytesPerSector;
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//FS info sector
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partition->fsInfoSector = startSector + (u8array_to_u16(sectorBuffer, BPB_FAT32_fsInfo) ? u8array_to_u16(sectorBuffer, BPB_FAT32_fsInfo) : 1);
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// Store info about FAT
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uint32_t clusterCount = (partition->numberOfSectors - (uint32_t)(partition->dataStart - startSector)) / partition->sectorsPerCluster;
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partition->fat.lastCluster = clusterCount + CLUSTER_FIRST - 1;
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partition->fat.firstFree = CLUSTER_FIRST;
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partition->fat.numberFreeCluster = 0;
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partition->fat.numberLastAllocCluster = 0;
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if (clusterCount < CLUSTERS_PER_FAT12) {
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partition->filesysType = FS_FAT12; // FAT12 volume
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@ -268,6 +286,8 @@ PARTITION* _FAT_partition_constructor (const DISC_INTERFACE* disc, uint32_t cach
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partition->openFileCount = 0;
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partition->firstOpenFile = NULL;
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_FAT_partition_readFSinfo(partition);
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return partition;
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}
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@ -283,6 +303,9 @@ void _FAT_partition_destructor (PARTITION* partition) {
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nextFile = nextFile->nextOpenFile;
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}
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// Write out the fs info sector
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_FAT_partition_writeFSinfo(partition);
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// Free memory used by the cache, writing it to disc at the same time
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_FAT_cache_destructor (partition->cache);
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@ -305,3 +328,77 @@ PARTITION* _FAT_partition_getPartitionFromPath (const char* path) {
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return (PARTITION*)devops->deviceData;
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}
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void _FAT_partition_createFSinfo(PARTITION * partition)
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{
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if(partition->readOnly || partition->filesysType != FS_FAT32)
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return;
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uint8_t sectorBuffer[BYTES_PER_READ];
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memset(sectorBuffer, 0, sizeof(sectorBuffer));
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int i;
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for(i = 0; i < 4; ++i)
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{
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sectorBuffer[FSIB_SIG1+i] = FS_INFO_SIG1[i];
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sectorBuffer[FSIB_SIG2+i] = FS_INFO_SIG2[i];
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}
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partition->fat.numberFreeCluster = _FAT_fat_freeClusterCount(partition);
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u32_to_u8array(sectorBuffer, FSIB_numberOfFreeCluster, partition->fat.numberFreeCluster);
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u32_to_u8array(sectorBuffer, FSIB_numberLastAllocCluster, partition->fat.numberLastAllocCluster);
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sectorBuffer[FSIB_bootSig_55] = 0x55;
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sectorBuffer[FSIB_bootSig_AA] = 0xAA;
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_FAT_disc_writeSectors (partition->disc, partition->fsInfoSector, 1, sectorBuffer);
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}
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void _FAT_partition_readFSinfo(PARTITION * partition)
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{
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if(partition->filesysType != FS_FAT32)
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return;
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uint8_t sectorBuffer[BYTES_PER_READ] = {0};
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// Read first sector of disc
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if (!_FAT_disc_readSectors (partition->disc, partition->fsInfoSector, 1, sectorBuffer)) {
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return;
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}
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if(memcmp(sectorBuffer+FSIB_SIG1, FS_INFO_SIG1, 4) != 0 ||
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memcmp(sectorBuffer+FSIB_SIG2, FS_INFO_SIG2, 4) != 0 ||
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u8array_to_u32(sectorBuffer, FSIB_numberOfFreeCluster) == 0)
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{
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//sector does not yet exist, create one!
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_FAT_partition_createFSinfo(partition);
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return;
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}
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partition->fat.numberFreeCluster = u8array_to_u32(sectorBuffer, FSIB_numberOfFreeCluster);
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partition->fat.numberLastAllocCluster = u8array_to_u32(sectorBuffer, FSIB_numberLastAllocCluster);
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}
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void _FAT_partition_writeFSinfo(PARTITION * partition)
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{
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if(partition->filesysType != FS_FAT32)
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return;
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uint8_t sectorBuffer[BYTES_PER_READ] = {0};
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// Read first sector of disc
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if (!_FAT_disc_readSectors (partition->disc, partition->fsInfoSector, 1, sectorBuffer)) {
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return;
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}
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if(memcmp(sectorBuffer+FSIB_SIG1, FS_INFO_SIG1, 4) || memcmp(sectorBuffer+FSIB_SIG2, FS_INFO_SIG2, 4))
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return;
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u32_to_u8array(sectorBuffer, FSIB_numberOfFreeCluster, partition->fat.numberFreeCluster);
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u32_to_u8array(sectorBuffer, FSIB_numberLastAllocCluster, partition->fat.numberLastAllocCluster);
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// Read first sector of disc
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if (!_FAT_disc_writeSectors (partition->disc, partition->fsInfoSector, 1, sectorBuffer)) {
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return;
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}
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}
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@ -45,6 +45,8 @@ typedef struct {
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uint32_t sectorsPerFat;
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uint32_t lastCluster;
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uint32_t firstFree;
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uint32_t numberFreeCluster;
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uint32_t numberLastAllocCluster;
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} FAT;
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typedef struct {
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@ -60,6 +62,7 @@ typedef struct {
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uint32_t bytesPerSector;
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uint32_t sectorsPerCluster;
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uint32_t bytesPerCluster;
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uint32_t fsInfoSector;
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FAT fat;
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// Values that may change after construction
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uint32_t cwdCluster; // Current working directory cluster
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@ -86,4 +89,19 @@ Return the partition specified in a path, as taken from the devoptab.
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*/
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PARTITION* _FAT_partition_getPartitionFromPath (const char* path);
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/*
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Create the fs info sector.
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*/
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void _FAT_partition_createFSinfo(PARTITION * partition);
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/*
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Read the fs info sector data.
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*/
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void _FAT_partition_readFSinfo(PARTITION * partition);
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/*
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Write the fs info sector data.
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*/
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void _FAT_partition_writeFSinfo(PARTITION * partition);
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#endif // _PARTITION_H
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