diff options
Diffstat (limited to 'lib/ext2fs/ext2fs.h')
| -rw-r--r-- | lib/ext2fs/ext2fs.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h index 516eb1af..5379422b 100644 --- a/lib/ext2fs/ext2fs.h +++ b/lib/ext2fs/ext2fs.h @@ -195,7 +195,7 @@ struct struct_ext2_filsys { char * device_name; struct ext2_super_block * super; unsigned int blocksize; - int clustersize; + int cluster_ratio_bits; dgrp_t group_desc_count; unsigned long desc_blocks; struct ext2_group_desc * group_desc; @@ -547,6 +547,17 @@ typedef struct ext2_icount *ext2_icount_t; #define EXT2_LIB_SOFTSUPP_INCOMPAT (0) #define EXT2_LIB_SOFTSUPP_RO_COMPAT (EXT4_FEATURE_RO_COMPAT_BIGALLOC) + +/* Translate a block number to a cluster number */ +#define EXT2FS_CLUSTER_RATIO(fs) (1 << (fs)->cluster_ratio_bits) +#define EXT2FS_CLUSTER_MASK(fs) (EXT2FS_CLUSTER_RATIO(fs) - 1) +#define EXT2FS_B2C(fs, blk) ((blk) >> (fs)->cluster_ratio_bits) +/* Translate a cluster number to a block number */ +#define EXT2FS_C2B(fs, cluster) ((cluster) << (fs)->cluster_ratio_bits) +/* Translate # of blks to # of clusters */ +#define EXT2FS_NUM_B2C(fs, blks) (((blks) + EXT2FS_CLUSTER_MASK(fs)) >> \ + (fs)->cluster_ratio_bits) + /* * function prototypes */ |