nullfs: stop lying about mount flags in statfs(2)

Flags should not propagate from the lower fs. Behavior for the upper fs
is determined by flags from its mount point structure. When lower fs
acts

nullfs: stop lying about mount flags in statfs(2)

Flags should not propagate from the lower fs. Behavior for the upper fs
is determined by flags from its mount point structure. When lower fs
acts according to its mount configuration, it is reported up as VOP
errors.

PR: 283425
Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D48150

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nullfs: Show correct exported flag.

MFC after: 3 days
Reviewed by: allanjude, kib
Differential Revision: https://reviews.freebsd.org/D44773

nullfs_mount(): fix whitespace

nullfs: add -o cache

to allow overwrite global default if needed.

Sponsored by: The FreeBSD Foundation
MFC after: 1 week

nullfs_mount(): remove unneeded cast

Sponsored by: The FreeBSD Foundation
MFC after: 1 week

nullfs: Add the vfs.nullfs.cache_nodes sysctl to control nocache default

Differential revision: https://reviews.freebsd.org/D44217
MFC after: 1 week

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 $FreeBSD$: one-line .h pattern

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

nullfs: ansify

Reported by: clang 15
Sponsored by: Rubicon Communications, LLC ("Netgate")

Add support for mounting single files in nullfs

The main use-case for this is to support mounting config files and
secrets into OCI containers. My current workaround copies the files into
the contai

Add support for mounting single files in nullfs

The main use-case for this is to support mounting config files and
secrets into OCI containers. My current workaround copies the files into
the container which is messy and risks secrets leaking into container
images if the cleanup fails.

This adds a VFCF flag to indicate whether the filesystem supports file
mounts and allows fspath to be either a directory or a file if the flag
is set.

Test Plan:
$ sudo mkdir -p /mnt
$ sudo touch /mnt/foo
$ sudo mount -t nullfs /COPYRIGHT /mnt/foo

Reviewed by: mjg, kib
Tested by: pho

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nullfs: adopt VV_CROSSLOCK

When the lower filesystem directory hierarchy is the same as the nullfs
mount point (admittedly not likely to be a useful situation in
practice), nullfs is subject to the

nullfs: adopt VV_CROSSLOCK

When the lower filesystem directory hierarchy is the same as the nullfs
mount point (admittedly not likely to be a useful situation in
practice), nullfs is subject to the exact deadlock between the busy
count drain and the covered vnode lock that VV_CROSSLOCK is intended
to address.

Reviewed by: kib
Tested by: pho
Differential Revision: https://reviews.freebsd.org/D37458

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vfs: NDFREE(&nd, NDF_ONLY_PNBUF) -> NDFREE_PNBUF(&nd)

nullfs: hash insertion without vnode lock upgrade

Use the hash lock to serialize instead.

This enables shared-locked ".." lookups.

Reviewed by: markj
Tested by: pho (previous version)
Differential

nullfs: hash insertion without vnode lock upgrade

Use the hash lock to serialize instead.

This enables shared-locked ".." lookups.

Reviewed by: markj
Tested by: pho (previous version)
Differential Revision: https://reviews.freebsd.org/D34466

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vfs: remove the unused thread argument from NDINIT*

See b4a58fbf640409a1 ("vfs: remove cn_thread")

Bump __FreeBSD_version to 1400043.

Allow stacked filesystems to be recursively unmounted

In certain emergency cases such as media failure or removal, UFS will
initiate a forced unmount in order to prevent dirty buffers from
accumulat

Allow stacked filesystems to be recursively unmounted

In certain emergency cases such as media failure or removal, UFS will
initiate a forced unmount in order to prevent dirty buffers from
accumulating against the no-longer-usable filesystem. The presence
of a stacked filesystem such as nullfs or unionfs above the UFS mount
will prevent this forced unmount from succeeding.

This change addreses the situation by allowing stacked filesystems to
be recursively unmounted on a taskqueue thread when the MNT_RECURSE
flag is specified to dounmount(). This call will block until all upper
mounts have been removed unless the caller specifies the MNT_DEFERRED
flag to indicate the base filesystem should also be unmounted from the
taskqueue.

To achieve this, the recently-added vfs_pin_from_vp()/vfs_unpin() KPIs
have been combined with the existing 'mnt_uppers' list used by nullfs
and renamed to vfs_register_upper_from_vp()/vfs_unregister_upper().
The format of the mnt_uppers list has also been changed to accommodate
filesystems such as unionfs in which a given mount may be stacked atop
more than one lower mount. Additionally, management of lower FS
reclaim/unlink notifications has been split into a separate list
managed by a separate set of KPIs, as registration of an upper FS no
longer implies interest in these notifications.

Reviewed by: kib, mckusick
Tested by: pho
Differential Revision: https://reviews.freebsd.org/D31016

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Add a generic mechanism for preventing forced unmount

This is aimed at preventing stacked filesystems like nullfs and unionfs
from "losing" their lower mounts due to forced unmount. Otherwise,
VFS

Add a generic mechanism for preventing forced unmount

This is aimed at preventing stacked filesystems like nullfs and unionfs
from "losing" their lower mounts due to forced unmount. Otherwise,
VFS operations that are passed through to the lower filesystem(s) may
crash or otherwise cause unpredictable behavior.

Introduce two new functions: vfs_pin_from_vp() and vfs_unpin().
which are intended to be called on the lower mount(s) when the stacked
filesystem is mounted and unmounted, respectively.
Much as registration in the mnt_uppers list previously did, pinning
will prevent even forced unmount of the lower FS and will allow the
stacked FS to freely operate on the lower mount either by direct
use of the struct mount* or indirect use through a properly-referenced
vnode's v_mount field.

vfs_pin_from_vp() is modeled after vfs_ref_from_vp() in that it uses
the mount interlock coupled with re-checking vp->v_mount to ensure
that it will fail in the face of a pending unmount request, even if
the concurrent unmount fully completes.

Adopt these new functions in both nullfs and unionfs.

Reviewed By: kib, markj
Differential Revision: https://reviews.freebsd.org/D30401

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VFS_QUOTACTL(9): allow implementation to indicate busy state changes

Instead of requiring all implementations of vfs_quotactl to unbusy
the mount for Q_QUOTAON and Q_QUOTAOFF, add an "mp_busy" in/ou

VFS_QUOTACTL(9): allow implementation to indicate busy state changes

Instead of requiring all implementations of vfs_quotactl to unbusy
the mount for Q_QUOTAON and Q_QUOTAOFF, add an "mp_busy" in/out param
to VFS_QUOTACTL(9). The implementation may then indicate to the caller
whether it needed to unbusy the mount.

Also, add stbool.h to libprocstat modules which #define _KERNEL
before including sys/mount.h. Otherwise they'll pull in sys/types.h
before defining _KERNEL and therefore won't have the bool definition
they need for mp_busy.

Reviewed By: kib, markj
Differential Revision: https://reviews.freebsd.org/D30556

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Revert commits 6d3e78ad6c11 and 54256e7954d7

Parts of libprocstat like to pretend they're kernel components for the
sake of including mount.h, and including sys/types.h in the _KERNEL
case doesn't f

Revert commits 6d3e78ad6c11 and 54256e7954d7

Parts of libprocstat like to pretend they're kernel components for the
sake of including mount.h, and including sys/types.h in the _KERNEL
case doesn't fix the build for some reason. Revert both the
VFS_QUOTACTL() change and the follow-up "fix" for now.

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VFS_QUOTACTL(9): allow implementation to indicate busy state changes

Instead of requiring all implementations of vfs_quotactl to unbusy
the mount for Q_QUOTAON and Q_QUOTAOFF, add an "mp_busy" in/ou

VFS_QUOTACTL(9): allow implementation to indicate busy state changes

Instead of requiring all implementations of vfs_quotactl to unbusy
the mount for Q_QUOTAON and Q_QUOTAOFF, add an "mp_busy" in/out param
to VFS_QUOTACTL(9). The implementation may then indicate to the caller
whether it needed to unbusy the mount.

Reviewed By: kib, markj
Differential Revision: https://reviews.freebsd.org/D30218

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Make it possible to mount nullfs(5) using plain mount(8)
instead of mount_nullfs(8).

Obviously you'd need to force mount(8) to not call
mount_nullfs(8) to make use of it.

Reviewed by: kib
MFC after

Make it possible to mount nullfs(5) using plain mount(8)
instead of mount_nullfs(8).

Obviously you'd need to force mount(8) to not call
mount_nullfs(8) to make use of it.

Reviewed by: kib
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D26934

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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)

Merge ^/head r358466 through r358677.