Linux Kernel Architecture

Chapter 9: The Extended Filesystem Family medium (thanks to the quality of today’s hard disks, it is almost always empty). This ...

Chapter 9: The Extended Filesystem Family An empty filesystem is not very interesting, so we need a way of filling the sample fi ...

Chapter 9: The Extended Filesystem Family Fields not shown are automatically initialized withNULLpointers by the compiler. The i ...

Chapter 9: The Extended Filesystem Family A fourth structure (super_operations) is used for interaction with the superblock (rea ...

Chapter 9: The Extended Filesystem Family Afunctionpointertoext2_fill_superis passed as a parameter forget_sb_bdev. This functio ...

Chapter 9: The Extended Filesystem Family The data block in which the superblock is located is then read bysb_bread.Thisisawrapp ...

Chapter 9: The Extended Filesystem Family Reading andGenerating Dataand IndirectionBlocks Once the filesystem has been mounted, ...

Chapter 9: The Extended Filesystem Family In this context, the termpathmeans the path through the descriptor tables to arrive at ...

Chapter 9: The Extended Filesystem Family ❑ To achieve better performance, the kernel also performs block reservation. This mean ...

Chapter 9: The Extended Filesystem Family Whilekeyindicates the block number,pis a pointer to the address in memory where the ke ...

Chapter 9: The Extended Filesystem Family Several steps are involved in searchingfor a new block. A search is first made for ago ...

Chapter 9: The Extended Filesystem Family Iterate until atleast the number of blocks requiredfor indirection hasbeen allocated e ...

Chapter 9: The Extended Filesystem Family inoderepresents the inode for which the allocation is performed, whilecountdesignates ...

Chapter 9: The Extended Filesystem Family main function used to allocate a new block and its reservation window.’’ We’re almost ...

Chapter 9: The Extended Filesystem Family By what criteria does the kernel update the reservation window? Observe the allocation ...

Chapter 9: The Extended Filesystem Family rsv_start grp_goal rsv_end group_first_block 100 120 140 160 200 reservation window cu ...

Chapter 9: The Extended Filesystem Family ❑ If a reservation window is available and the reservation starts within the block gro ...

Chapter 9: The Extended Filesystem Family If no free bit is found near the desired goal, the search is not performed bitwise, bu ...

Chapter 9: The Extended Filesystem Family Compute start block alloc_new_reservation search_reserve_window find_next_reservable_w ...

Chapter 9: The Extended Filesystem Family * we will come here when we just failed to allocate from * the first part of the windo ...