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[ch8][fix]fix round up error during data block allocation #5

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[ch8][fix]fix round up error during data block allocation #5

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7 changes: 6 additions & 1 deletion easy-fs/src/efs.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -41,7 +41,12 @@ impl EasyFileSystem {
((inode_num * core::mem::size_of::<DiskInode>() + BLOCK_SZ - 1) / BLOCK_SZ) as u32;
let inode_total_blocks = inode_bitmap_blocks + inode_area_blocks;
let data_total_blocks = total_blocks - 1 - inode_total_blocks;
let data_bitmap_blocks = (data_total_blocks + 4096) / 4097;
let data_bitmap_blocks = data_total_blocks / 4097;
assert!(
data_bitmap_blocks >= 1,
"Not enough blocks for data bitmap! data_total_blocks={}",
data_total_blocks
);
let data_area_blocks = data_total_blocks - data_bitmap_blocks;
let data_bitmap = Bitmap::new(
(1 + inode_bitmap_blocks + inode_area_blocks) as usize,
Expand Down