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include: one folder per subsystem, and includes that name it

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Sixty-five headers sat side by side in include/, so `#include "irq.h"`
said nothing about where irq.h was or what it belonged to, and errno.h,
stat.h and fcntl.h at the top shadowed the system's for any host tool
built with -I./include. They are in folders now -- arch/ core/ fs/
dev/ gfx/ net/ uapi/ (and ldls/ for the Linux driver layer) -- and
every include names the folder, as Linux's do: "core/proc.h".

Done mechanically and checked the hard way: the kernel built from this
tree disassembles identically to the one built from the tree before
it. The full image boots, and userland is the same set of programs.
Paths in docs and comments follow; docs/guides/layout.md has a table
of what is where, and tools/fix-includes.py rewrites old-style
includes from the folders in the tree, for code written before this.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
This commit is contained in:
Nexoniarz 2026-10-23 15:05:12 +02:00
commit a1c965da1e
267 changed files with 1560 additions and 1440 deletions
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2
docs/architecture/filesystem.md
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@ -344,7 +344,7 @@ both need the `..` fixup and the ancestor-loop check that are not written.
A name is at most 255 bytes and a path 4096 including its NUL, Linux's
`NAME_MAX` and `PATH_MAX` (`VFS_NAME_MAX` and `VFS_PATH_MAX` in
`include/file.h`). Longer is `ENAMETOOLONG`. A filesystem may hold less: the v1
`include/fs/file.h`). Longer is `ENAMETOOLONG`. A filesystem may hold less: the v1
format stores `DIRSIZ` bytes and refuses longer names rather than matching on
their first 30.