Unix Algo Part 2

By Khusboo Breja (M.Sc 2013)

Algo	Chapter	Input	Output
getblk(to get a block)	3	File System number	locked buffer that can now be used for block
		block number
brelse(to release a block)	3	locked buffer	none
bread(Agorithm to read a block)	3	file system block number	buffer containing data
breada(Algorith to read a block ahead)	3	(1)file system block number containing for immediate read	buffer containing data for immediate read
		(2)file system block number for asynchronous read
bwrite(to write a block)	3	buffer	none
iget( for allocation of In-core Inodes	4	file system inode number	locked inode
iput(to release an Inode)	4	pointer to in-core inode	none
bmap(to convert byte offset to block number in file system)	4	(1)inode	(1)block number in file system
		(2)byte offset	(2)byte offset into block
			(3)bytes of I/O in block
			(4)read ahead block number
namei(to convert path name to an Inode)	4	path name	locked inode
ialloc( for assigning new Inodes)	4	file  system	locked inode
ifree( for freeing Inode)	4	file system inode number	none
alloc( for allocating disk blocks)	4	file system number	buffer for new block