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use and_then_some::BoolExt;
use crate::AyaFS;
use crate::disk::data_block::InodeBlock;
use crate::disk::inode::{Inode, INODE_SIZE, InodeMode};
impl AyaFS {
pub(crate) fn create_inode(
&mut self,
permissions: u16,
mode: InodeMode,
uid: u32,
gid: u32,
flags: u32,
) -> Option<usize> {
self.inode_bitmap.allocate().map(|inode_index| {
self.get_inode_mut(inode_index).map(|inode| {
*inode = Inode::make_inode(
permissions,
mode,
uid,
gid,
Self::time_now(),
flags,
0,
0,
0,
);
});
inode_index
})
}
pub(crate) fn get_inode(&mut self, inode_index: usize) -> Option<&Inode> {
self.inode_bitmap.query(inode_index).and_then(|| {
let (block_index, offset) = self.locate_inode(inode_index);
self.get_block::<InodeBlock>(block_index)
.map(|cached_block| &cached_block.block.inodes[offset / INODE_SIZE])
})
}
pub(crate) fn get_inode_mut(&mut self, inode_index: usize) -> Option<&mut Inode> {
self.inode_bitmap.query(inode_index).and_then(|| {
let (block_index, offset) = self.locate_inode(inode_index);
self.get_block_mut::<InodeBlock>(block_index)
.map(|cached_block| {
cached_block.dirty = true; // 保守一些, 只要返回了 &mut Inode 这个页一定标记为脏
&mut cached_block.block.inodes[offset / INODE_SIZE]
})
})
}
}
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