Linux Filesystems API

Table of Contents

1. The Linux VFS

The Filesystem types

The Directory Cache

Inode Handling

Registration and Superblocks

File Locks

Other Functions

2. The proc filesystem

sysctl interface

proc filesystem interface

3. Events based on file descriptors

eventfd_signal — Adds n to the eventfd counter.

eventfd_ctx_get — Acquires a reference to the internal eventfd context.

eventfd_ctx_put — Releases a reference to the internal eventfd context.

eventfd_ctx_remove_wait_queue — Read the current counter and removes wait queue.

eventfd_ctx_read — Reads the eventfd counter or wait if it is zero.

eventfd_fget — Acquire a reference of an eventfd file descriptor.

eventfd_ctx_fdget — Acquires a reference to the internal eventfd context.

eventfd_ctx_fileget — Acquires a reference to the internal eventfd context.

4. The Filesystem for Exporting Kernel Objects

sysfs_create_file_ns — create an attribute file for an object with custom ns

sysfs_add_file_to_group — add an attribute file to a pre-existing group.

sysfs_chmod_file — update the modified mode value on an object attribute.

sysfs_remove_file_ns — remove an object attribute with a custom ns tag

sysfs_remove_file_from_group — remove an attribute file from a group.

sysfs_create_bin_file — create binary file for object.

sysfs_remove_bin_file — remove binary file for object.

sysfs_create_link — create symlink between two objects.

sysfs_remove_link — remove symlink in object's directory.

sysfs_rename_link_ns — rename symlink in object's directory.

5. The debugfs filesystem

debugfs interface

6. The Linux Journalling API

Overview

Details

Summary

Data Types

Structures

Functions

Journal Level

Transasction Level

See also

7. splice API

splice_to_pipe — fill passed data into a pipe

generic_file_splice_read — splice data from file to a pipe

splice_from_pipe_feed — feed available data from a pipe to a file

splice_from_pipe_next — wait for some data to splice from

splice_from_pipe_begin — start splicing from pipe

splice_from_pipe_end — finish splicing from pipe

__splice_from_pipe — splice data from a pipe to given actor

splice_from_pipe — splice data from a pipe to a file

iter_file_splice_write — splice data from a pipe to a file

generic_splice_sendpage — splice data from a pipe to a socket

splice_direct_to_actor — splices data directly between two non-pipes

do_splice_direct — splices data directly between two files

8. pipes API

struct pipe_buffer — a linux kernel pipe buffer

struct pipe_inode_info — a linux kernel pipe

pipe_buf_get — get a reference to a pipe_buffer

pipe_buf_release — put a reference to a pipe_buffer

pipe_buf_confirm — verify contents of the pipe buffer

pipe_buf_steal — attempt to take ownership of a pipe_buffer

generic_pipe_buf_steal — attempt to take ownership of a &pipe_buffer

generic_pipe_buf_get get a reference to a struct pipe_buffer

generic_pipe_buf_confirm — verify contents of the pipe buffer

generic_pipe_buf_release put a reference to a struct pipe_buffer