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https://github.com/wiiu-env/wiiu-nanddumper-payload.git
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fat writing optimization
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parent
1258dbb2fe
commit
7396fe9009
@ -131,6 +131,7 @@ int fatfs_init(struct fatfs *fs)
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// For FAT32 (which this may be)
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fs->rootdir_first_cluster = GET_32BIT_WORD(fs->currentsector.sector, BPB_FAT32_ROOTCLUS);
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fs->last_free_cluster = fs->rootdir_first_cluster + 1;
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fs->fs_info_sector = GET_16BIT_WORD(fs->currentsector.sector, BPB_FAT32_FSINFO);
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// For FAT16 (which this may be), rootdir_first_cluster is actuall rootdir_first_sector
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@ -60,6 +60,7 @@ struct fatfs
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uint8 sectors_per_cluster;
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uint32 cluster_begin_lba;
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uint32 rootdir_first_cluster;
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uint32 last_free_cluster;
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uint32 rootdir_first_sector;
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uint32 rootdir_sectors;
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uint32 fat_begin_lba;
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@ -337,6 +337,7 @@ int fatfs_find_blank_cluster(struct fatfs *fs, uint32 start_cluster, uint32 *fre
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while (nextcluster != 0x0);
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// Found blank entry
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fs->last_free_cluster = current_cluster + 1;
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*free_cluster = current_cluster;
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return 1;
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}
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@ -55,7 +55,7 @@ int fatfs_add_free_space(struct fatfs *fs, uint32 *startCluster, uint32 clusters
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for (i=0;i<clusters;i++)
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{
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// Start looking for free clusters from the beginning
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if (fatfs_find_blank_cluster(fs, fs->rootdir_first_cluster, &nextcluster))
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if (fatfs_find_blank_cluster(fs, fs->last_free_cluster, &nextcluster))
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{
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// Point last to this
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fatfs_fat_set_cluster(fs, start, nextcluster);
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@ -103,7 +103,7 @@ int fatfs_allocate_free_space(struct fatfs *fs, int newFile, uint32 *startCluste
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// Allocated first link in the chain if a new file
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if (newFile)
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{
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if (!fatfs_find_blank_cluster(fs, fs->rootdir_first_cluster, &nextcluster))
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if (!fatfs_find_blank_cluster(fs, fs->last_free_cluster, &nextcluster))
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return 0;
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// If this is all that is needed then all done
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@ -230,7 +230,7 @@ static int fatfs_find_free_dir_offset(struct fatfs *fs, uint32 dirCluster, int e
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uint32 newCluster;
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// Get a new cluster for directory
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if (!fatfs_find_blank_cluster(fs, fs->rootdir_first_cluster, &newCluster))
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if (!fatfs_find_blank_cluster(fs, fs->last_free_cluster, &newCluster))
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return 0;
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// Add cluster to end of directory tree
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