src/sys/modules/pseudofs, branch main

Revert "pseudofs: defer initialization until first mount"

2025-09-04T12:51:41+00:00

This reverts commit 65059dd2b6f94e570acc645be82b8ea056316459.

lindebugfs does he vast majority of its pseudofs initialization nearly
everywhere but pseudofs, so let's defer this to post-brsnching.

pseudofs: defer initialization until first mount

2025-09-04T02:08:52+00:00

Currently, pseudofs all get fully constructed when the module is loaded
and vfs registered, but this is pretty unnecessary.  Just loading the
fs doesn't mean that it will be used so we're adding overhead and
risk[0] by fully initializing these at the start, along with committing
resources that may not be used.

Deferring pfs_init() allows us to reduce the risk of simply loading the
module causing problems that are harder to avoid, and existing pseudo
filesystems don't really care: configuration that is context-sensitive
is generally deferred to access-time with PFS_PROCDEP.

To preserve symmetry, we'll also teardown our pseudofs on last unmount,
which leaves us with a vfs_uninit() implementation that simply destroys
our lock and prints a message.

[0] Example of such being recent bugs in linsysfs, which caused a panic
as soon as the module was loaded because we're eager to set it up.

Reviewed by:	des (previous version), kib
Differential Revision:	https://reviews.freebsd.org/D52156

Remove residual blank line at start of Makefile

2024-07-15T22:43:39+00:00

This is a residual of the $FreeBSD$ removal.

MFC After: 3 days (though I'll just run the command on the branches)
Sponsored by: Netflix

sys: Remove $FreeBSD$: one-line sh pattern

2023-08-16T17:54:58+00:00

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

Fix some modules to export more used symbols

2021-11-18T13:56:23+00:00

and remove non-present symbols that are now reported by kmod_syms.awk.

Reviewed by:	emaste
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D32878

sys/modules: normalize .CURDIR-relative paths to SRCTOP

2017-03-04T10:10:17+00:00

This simplifies make output/logic

Tested with:	`cd sys/modules; make ALL_MODULES=` on amd64
MFC after:	1 month
Sponsored by:	Dell EMC Isilon

Hide vfs.pfs.trace variable if it is not used.

2015-05-24T18:11:22+00:00

Remove opt_mac.h generation for various kernel modules that no longer

2009-06-06T17:01:44+00:00

require it.

Submitted by:	pjd

Add PSEUDOFS_TRACE option.

2005-03-14T16:04:27+00:00

Introduce support for Mandatory Access Control and extensible

2002-08-01T01:33:12+00:00

kernel access control.

Modify pseudofs so that it can support synthetic file systems with
the multilabel flag set.  In particular, implement vop_refreshlabel()
as pn_refreshlabel().  Implement pfs_refreshlabel() to invoke this,
and have it fall back to the mount label if the file system does
not implement pn_refreshlabel() for the node.  Otherwise, permit
the file system to determine how the service is provided.

Approved by:	des
Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, NAI Labs