CVS commit: src

["Kamil Rytarowski" <kamil%netbsd.org@localhost>]

Module Name:    src
Committed By:   kamil
Date:           Mon Aug 28 00:46:07 UTC 2017

Modified Files:
        src/bin/ps: ps.1
        src/doc: TODO.ptrace
        src/sbin/mount_procfs: mount_procfs.8
        src/share/man/man9: kauth.9
        src/sys/compat/linux/arch/arm: linux_ptrace.c
        src/sys/compat/linux/arch/i386: linux_ptrace.c
        src/sys/compat/linux/arch/powerpc: linux_ptrace.c
        src/sys/kern: kern_exit.c kern_proc.c kern_sig.c sys_ptrace_common.c
        src/sys/miscfs/procfs: files.procfs procfs.h procfs_subr.c
            procfs_vfsops.c procfs_vnops.c
        src/sys/modules/procfs: Makefile
        src/sys/sys: kauth.h proc.h sysctl.h
Removed Files:
        src/sys/miscfs/procfs: procfs_ctl.c

Log Message:
Remove the filesystem tracing feature

This is a legacy interface from 4.4BSD, and it was
introduced to overcome shortcomings of ptrace(2) at that time, which are
no longer relevant (performance). Today /proc/#/ctl offers a narrow
subset of ptrace(2) commands and is not applicable for modern
applications use beyond simplistic tracing scenarios.

This removal will simplify kernel internals. Users will still be able to
use all the other /proc files.

This change won't affect other procfs files neither Linux compat
features within mount_procfs(8). /proc/#/ctl isn't available on Linux.

Remove:
 - /proc/#/ctl from mount_procfs(8)
 - P_FSTRACE note from the documentation of ps(1)
 - /proc/#/ctl and filesystem tracing documentation from mount_procfs(8)
 - KAUTH_REQ_PROCESS_PROCFS_CTL documentation from kauth(9)
 - source code file miscfs/procfs/procfs_ctl.c
 - PFSctl and procfs_doctl() from sys/miscfs/procfs/procfs.h
 - KAUTH_REQ_PROCESS_PROCFS_CTL from sys/sys/kauth.h
 - PSL_FSTRACE (0x00010000) from sys/sys/proc.h
 - P_FSTRACE (0x00010000) from sys/sys/sysctl.h

Reduce code complexity after removal of this functionality.

Update TODO.ptrace accordingly: remove two entries about /proc tracing.

Do not keep legacy notes as comments in the headers about removed
PSL_FSTRACE / P_FSTRACE, as this interface had little number of users
(close or equal to zero).

Proposed on tech-kern@.

All filesystem tracing utility users are encouraged to switch to ptrace(2).

Sponsored by <The NetBSD Foundation>


To generate a diff of this commit:
cvs rdiff -u -r1.107 -r1.108 src/bin/ps/ps.1
cvs rdiff -u -r1.28 -r1.29 src/doc/TODO.ptrace
cvs rdiff -u -r1.35 -r1.36 src/sbin/mount_procfs/mount_procfs.8
cvs rdiff -u -r1.108 -r1.109 src/share/man/man9/kauth.9
cvs rdiff -u -r1.19 -r1.20 src/sys/compat/linux/arch/arm/linux_ptrace.c
cvs rdiff -u -r1.31 -r1.32 src/sys/compat/linux/arch/i386/linux_ptrace.c
cvs rdiff -u -r1.29 -r1.30 src/sys/compat/linux/arch/powerpc/linux_ptrace.c
cvs rdiff -u -r1.268 -r1.269 src/sys/kern/kern_exit.c
cvs rdiff -u -r1.206 -r1.207 src/sys/kern/kern_proc.c
cvs rdiff -u -r1.336 -r1.337 src/sys/kern/kern_sig.c
cvs rdiff -u -r1.22 -r1.23 src/sys/kern/sys_ptrace_common.c
cvs rdiff -u -r1.11 -r1.12 src/sys/miscfs/procfs/files.procfs
cvs rdiff -u -r1.71 -r1.72 src/sys/miscfs/procfs/procfs.h
cvs rdiff -u -r1.48 -r0 src/sys/miscfs/procfs/procfs_ctl.c
cvs rdiff -u -r1.108 -r1.109 src/sys/miscfs/procfs/procfs_subr.c
cvs rdiff -u -r1.97 -r1.98 src/sys/miscfs/procfs/procfs_vfsops.c
cvs rdiff -u -r1.197 -r1.198 src/sys/miscfs/procfs/procfs_vnops.c
cvs rdiff -u -r1.3 -r1.4 src/sys/modules/procfs/Makefile
cvs rdiff -u -r1.74 -r1.75 src/sys/sys/kauth.h
cvs rdiff -u -r1.341 -r1.342 src/sys/sys/proc.h
cvs rdiff -u -r1.223 -r1.224 src/sys/sys/sysctl.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.