net/9p/trans_usbg.c

File Facts

System

Linux kernel

Corpus path

net/9p/trans_usbg.c

Extension

.c

Size

23227 bytes

Lines

970

Domain

Networking Core

Bucket

Sockets, Protocols, Packet Path, And Network Policy

Inferred role

Networking Core: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

• Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/cleanup.h
• linux/kernel.h
• linux/module.h
• linux/fs_context.h
• linux/usb/composite.h
• linux/usb/func_utils.h
• net/9p/9p.h
• net/9p/client.h
• net/9p/transport.h

Detected Declarations

• struct f_usb9pfs
• struct f_usb9pfs_opts
• struct f_usb9pfs_dev
• function usb9pfs_queue_tx
• function usb9pfs_queue_rx
• function usb9pfs_transmit
• function usb9pfs_tx_complete
• function usb9pfs_rx_complete
• function disable_ep
• function disable_usb9pfs
• function alloc_requests
• function enable_endpoint
• function enable_usb9pfs
• function p9_usbg_create
• function list_for_each_entry
• function usb9pfs_clear_tx
• function p9_usbg_close
• function p9_usbg_request
• function p9_usbg_cancel
• function usb9pfs_func_bind
• function usb9pfs_func_unbind
• function usb9pfs_free_func
• function usb9pfs_set_alt
• function usb9pfs_disable
• function usb9pfs_attr_release
• function f_usb9pfs_opts_buflen_show
• function f_usb9pfs_opts_buflen_store
• function list_for_each_entry
• function usb9pfs_tag_instance
• function usb9pfs_set_inst_tag
• function usb9pfs_free_instance
• function usb9pfs_modinit
• function usb9pfs_modexit
• module init usb9pfs_modinit

Annotated Snippet

module_init(usb9pfs_modinit);
module_exit(usb9pfs_modexit);

MODULE_ALIAS_9P("usbg");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("USB gadget 9pfs transport");
MODULE_AUTHOR("Michael Grzeschik");

Annotation

• Immediate include surface: `linux/cleanup.h`, `linux/kernel.h`, `linux/module.h`, `linux/fs_context.h`, `linux/usb/composite.h`, `linux/usb/func_utils.h`, `net/9p/9p.h`, `net/9p/client.h`.
• Detected declarations: `struct f_usb9pfs`, `struct f_usb9pfs_opts`, `struct f_usb9pfs_dev`, `function usb9pfs_queue_tx`, `function usb9pfs_queue_rx`, `function usb9pfs_transmit`, `function usb9pfs_tx_complete`, `function usb9pfs_rx_complete`, `function disable_ep`, `function disable_usb9pfs`.
• Atlas domain: Networking Core / Sockets, Protocols, Packet Path, And Network Policy.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.