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use io;
fn getblockdata(filesystem: *bfs, blockid: u64, data: []u8) (void | io::error) = {
const blockaddr = (blockid << filesystem.bootsector.blocksize): io::off;
pread(filesystem.device, data, blockaddr)?;
};
fn setblockdata(filesystem: *bfs, blockid: u64, data: []u8) (void | io::error) = {
const blockaddr = (blockid << filesystem.bootsector.blocksize): io::off;
pwrite(filesystem.device, data, blockaddr)?;
};
// Inode block: a block used to store
// inodes
export type inode_block = struct {
// Previous inode block containing
// free inodes, or 0
@offset(0) prevblock: u64,
// Next inode block containing
// free inodes, or 0
@offset(8) nextblock: u64,
// Next free inode in the block
@offset(16) nextinode: u64,
// Lowest yet to be allocated inode
@offset(24) freeinode: u64,
// Count of free inodes in block
@offset(32) freecount: u64,
};
export fn getinblock(filesystem: *bfs, blockid: u64, inblock: *inode_block) (void | io::error) = {
getblockdata(filesystem, blockid, inblock: *[size(inode_block)]u8)?;
};
export fn setinblock(filesystem: *bfs, blockid: u64, inblock: *inode_block) (void | io::error) = {
setblockdata(filesystem, blockid, inblock: *[size(inode_block)]u8)?;
};
// Free block: a block that has been
// previously freed
export type free_block = struct {
// Previous freeblock in freelist
// or 0
@offset(0) prevblock: u64,
};
export fn getfreeblock(filesystem: *bfs, blockid: u64, freeblock: *free_block) (void | io::error) = {
getblockdata(filesystem, blockid, freeblock: *[size(free_block)]u8)?;
};
export fn setfreeblock(filesystem: *bfs, blockid: u64, freeblock: *free_block) (void | io::error) = {
setblockdata(filesystem, blockid, freeblock: *[size(free_block)]u8)?;
};
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