sys: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl s

sys: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

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Fix MNT_IGNORE for devfs, fdescfs and nullfs

The MNT_IGNORE flag can be used to mark certain filesystem mounts so
that utilities such as df(1) and mount(8) can filter out those mounts by
default. Th

Fix MNT_IGNORE for devfs, fdescfs and nullfs

The MNT_IGNORE flag can be used to mark certain filesystem mounts so
that utilities such as df(1) and mount(8) can filter out those mounts by
default. This can be used, for instance, to reduce the noise from
running container workloads inside jails which often have at least three
and sometimes as many as ten mounts per container.

The flag is supplied by the nmount(2) system call and is recorded so
that it can be reported by statfs(2). Unfortunately several filesystems
override the default behaviour and mask out the flag, defeating its
purpose. This change preserves the MNT_IGNORE flag for those filesystems
so that it can be reported correctly.

MFC after: 1 week

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sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

fdescfs: add a mount option rdlnk

which changes /dev/fd/N files types to symbolic link with the behavior
of symbolic links.

PR: 272127
Reported by: Peter Eriksson <pen@lysator.liu.se>
Reviewed by:

fdescfs: add a mount option rdlnk

which changes /dev/fd/N files types to symbolic link with the behavior
of symbolic links.

PR: 272127
Reported by: Peter Eriksson <pen@lysator.liu.se>
Reviewed by: dchagin
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D40969

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sys/fs: do not report blocks allocated for synthetic file systems

The pseudo file systems (devfs, fdescfs, procfs, etc.) report total
and available blocks and inodes despite being synthetic with no

sys/fs: do not report blocks allocated for synthetic file systems

The pseudo file systems (devfs, fdescfs, procfs, etc.) report total
and available blocks and inodes despite being synthetic with no
underlying storage device to which those values could be applied.

The current code of these file systems tends to report a fixed number
of total blocks but no free blocks, and in the case of procfs,
libprocfs, linsysfs also no free inodes.

This can be irritating in e.g. the "df" output, since 100% of the
resources seem to be in use, but it can also create warnings in
monitoring tools used for capacity management.

This patch makes these file systems return the same value for the
total and free parameters, leading to 0% in use being displayed by
"df". Since there is no resource that can be exhausted, this appears
to be a sensible result.

Reviewed by: mckusick
Differential Revision: https://reviews.freebsd.org/D39442

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fdescfs: remove useless XXX comment, unwrap line

Reviewed by: markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D39207

fdescfs: add an option to return underlying file vnode on lookup

The 'nodup' option forces fdescfs to return real vnode behind file
descriptor instead of the fdescfs fd vnode, on lookup. The end res

fdescfs: add an option to return underlying file vnode on lookup

The 'nodup' option forces fdescfs to return real vnode behind file
descriptor instead of the fdescfs fd vnode, on lookup. The end result
is that e.g. stat("/dev/fd/3") returns the stat data for the underlying
vnode, if any. Similarly, fchdir(2) works in the expected way.

For open(2), if applied over file descriptor opened with O_PATH, it
effectively re-open that vnode into normal file descriptor which has the
specified access mode, assuming the current vnode permissions allow it.

If the file descriptor does not reference vnode, the behavior is unchanged.

This is done by a mount option, because permission check on open(2) breaks
established fdescfs open semantic of dup(2)-ing the descriptor. So it
is not suitable for /dev/fd mount.

Tested by: Andrew Walker <awalker@ixsystems.com>
Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D30140

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fdescfs: allow shared locking of root vnode

Eliminates fdescfs from lock profile when running poudriere.

MFH

Sponsored by: Rubicon Communications, LLC (netgate.com)

Merge ^/head r364264 through r364278.

vfs: remove the thread argument from vget

It was already asserted to be curthread.

Semantic patch:

@@

expression arg1, arg2, arg3;

@@

- vget(arg1, arg2, arg3)
+ vget(arg1, arg2)

vfs: drop the mostly unused flags argument from VOP_UNLOCK

Filesystems which want to use it in limited capacity can employ the
VOP_UNLOCK_FLAGS macro.

Reviewed by: kib (previous version)
Differenti

vfs: drop the mostly unused flags argument from VOP_UNLOCK

Filesystems which want to use it in limited capacity can employ the
VOP_UNLOCK_FLAGS macro.

Reviewed by: kib (previous version)
Differential Revision: https://reviews.freebsd.org/D21427

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Make it easier for filesystems to count themselves as jail-enabled,
by doing most of the work in a new function prison_add_vfs in kern_jail.c
Now a jail-enabled filesystem need only mark itself with

Make it easier for filesystems to count themselves as jail-enabled,
by doing most of the work in a new function prison_add_vfs in kern_jail.c
Now a jail-enabled filesystem need only mark itself with VFCF_JAIL, and
the rest is taken care of. This includes adding a jail parameter like
allow.mount.foofs, and a sysctl like security.jail.mount_foofs_allowed.
Both of these used to be a static list of known filesystems, with
predefined permission bits.

Reviewed by: kib
Differential Revision: D14681

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Merge ^/head r325999 through r326131.

sys: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for

sys: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

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Merge ^/head r321383 through r322397.

MFhead@r321970

MFhead@r321851

Implement proper Linux /dev/fd and /proc/self/fd behavior by adding
Linux specific things to the native fdescfs file system.

Unlike FreeBSD, the Linux fdescfs is a directory containing a symbolic
li

Implement proper Linux /dev/fd and /proc/self/fd behavior by adding
Linux specific things to the native fdescfs file system.

Unlike FreeBSD, the Linux fdescfs is a directory containing a symbolic
links to the actual files, which the process has open.
A readlink(2) call on this file returns a full path in case of regular file
or a string in a special format (type:[inode], anon_inode:<file-type>, etc..).
As well as in a FreeBSD, opening the file in the Linux fdescfs directory is
equivalent to duplicating the corresponding file descriptor.

Here we have mutually exclusive requirements:
- in case of readlink(2) call fdescfs lookup() method should return VLNK
vnode otherwise our kern_readlink() fail with EINVAL error;
- in the other calls fdescfs lookup() method should return non VLNK vnode.

For what new vnode v_flag VV_READLINK was added, which is set if fdescfs has beed
mounted with linrdlnk option an modified kern_readlinkat() to properly handle it.

For now For Linux ABI compatibility mount fdescfs volume with linrdlnk option:

mount -t fdescfs -o linrdlnk null /compat/linux/dev/fd

Reviewed by: kib@
MFC after: 1 week
Relnotes: yes

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MFhead@r320180

Merge ^/head r319973 through 321382.

Merge ^/head r320573 through r320970.

Eliminate the bogus cast.

MFC after: 3 weeks

Eliminate the bogus cast.

MFC after: 3 weeks

Don't take a lock around atomic operation.

MFC after: 3 weeks