VFS: add VOP_GETLOWVNODE()

(cherry picked from commit 4cbe4c48a7e574ec1bb919351d7a57d252b00b62)

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

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

vnode(9): Fix a typo in a source code comment

- s/paramater/parameter/

MFC after: 3 days

Change VOP_READDIR's cookies argument to a **uint64_t

The cookies argument is only used by the NFS server. NFSv2 defines the
cookie as 32 bits on the wire, but NFSv3 increased it to 64 bits. Our
V

Change VOP_READDIR's cookies argument to a **uint64_t

The cookies argument is only used by the NFS server. NFSv2 defines the
cookie as 32 bits on the wire, but NFSv3 increased it to 64 bits. Our
VOP_READDIR, however, has always defined it as u_long, which is 32 bits
on some architectures. Change it to 64 bits on all architectures. This
doesn't matter for any in-tree file systems, but it matters for some
FUSE file systems that use 64-bit directory cookies.

PR: 260375
Reviewed by: rmacklem
Differential Revision: https://reviews.freebsd.org/D33404

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Make locking assertions for VOP_FSYNC() and VOP_FDATASYNC() more correct

For devfs vnodes, it is fine to not lock vnodes for VOP_FSYNC().
Otherwise vnode must be locked exclusively, except for MNT_S

Make locking assertions for VOP_FSYNC() and VOP_FDATASYNC() more correct

For devfs vnodes, it is fine to not lock vnodes for VOP_FSYNC().
Otherwise vnode must be locked exclusively, except for MNT_SHARED_WRITES()
where the shared lock is enough.

Reported and tested by: pho
Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D32761

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vfs: Add "ioflag" and "cred" arguments to VOP_ALLOCATE

When the NFSv4.2 server does a VOP_ALLOCATE(), it needs
the operation to be done for the RPC's credential and not
td_ucred. It also needs the w

vfs: Add "ioflag" and "cred" arguments to VOP_ALLOCATE

When the NFSv4.2 server does a VOP_ALLOCATE(), it needs
the operation to be done for the RPC's credential and not
td_ucred. It also needs the writing to be done synchronously.

This patch adds "ioflag" and "cred" arguments to VOP_ALLOCATE()
and modifies vop_stdallocate() to use these arguments.

The VOP_ALLOCATE.9 man page will be patched separately.

Reviewed by: khng, kib
Differential Revision: https://reviews.freebsd.org/D32865

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vfs: remove thread argument from VOP_STAT

and fo_stat.

vfs: Add ioflag to VOP_DEALLOCATE(9)

The addition of ioflag allows callers passing
IO_SYNC/IO_DATASYNC/IO_DIRECT down to the file system implementation.
The vop_stddeallocate fallback implementation

vfs: Add ioflag to VOP_DEALLOCATE(9)

The addition of ioflag allows callers passing
IO_SYNC/IO_DATASYNC/IO_DIRECT down to the file system implementation.
The vop_stddeallocate fallback implementation is updated to pass the
ioflag to the file system implementation. vn_deallocate(9) internally is
also changed to pass ioflag to the VOP_DEALLOCATE call.

Sponsored by: The FreeBSD Foundation
Reviewed by: kib, markj
Differential Revision: https://reviews.freebsd.org/D31500

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Add fspacectl(2), vn_deallocate(9) and VOP_DEALLOCATE(9).

fspacectl(2) is a system call to provide space management support to
userspace applications. VOP_DEALLOCATE(9) is a VOP call to perform the

Add fspacectl(2), vn_deallocate(9) and VOP_DEALLOCATE(9).

fspacectl(2) is a system call to provide space management support to
userspace applications. VOP_DEALLOCATE(9) is a VOP call to perform the
deallocation. vn_deallocate(9) is a public KPI for kmods' use.

The purpose of proposing a new system call, a KPI and a VOP call is to
allow bhyve or other hypervisor monitors to emulate the behavior of SCSI
UNMAP/NVMe DEALLOCATE on a plain file.

fspacectl(2) comprises of cmd and flags parameters to specify the
space management operation to be performed. Currently cmd has to be
SPACECTL_DEALLOC, and flags has to be 0.

fo_fspacectl is added to fileops.
VOP_DEALLOCATE(9) is added as a new VOP call. A trivial implementation
of VOP_DEALLOCATE(9) is provided.

Sponsored by: The FreeBSD Foundation
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D28347

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Add VOP_VPUT_PAIR() with trivial default implementation.

The VOP is intended to be used in situations where VFS has two
referenced locked vnodes, typically a directory vnode dvp and a vnode
vp that

Add VOP_VPUT_PAIR() with trivial default implementation.

The VOP is intended to be used in situations where VFS has two
referenced locked vnodes, typically a directory vnode dvp and a vnode
vp that is linked from the directory, and at least dvp is vput(9)ed.
The child vnode can be also vput-ed, but optionally left referenced and
locked.

There, at least UFS may need to do some actions with dvp which cannot be
done while vp is also locked, so its lock might be dropped temporary.
For instance, in some cases UFS needs to sync dvp to avoid filesystem
state that is currently not handled by either kernel nor fsck. Having
such VOP provides the neccessary context for filesystem which can do
correct locking and handle potential reclamation of vp after relock.

Trivial implementation does vput(dvp) and optionally vput(vp).

Reviewed by: chs, mckusick
Tested by: pho
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation

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cache: add symlink support to lockless lookup

Reviewed by: kib (previous version)
Tested by: pho (previous version)
Differential Revision: https://reviews.freebsd.org/D27488

vfs: prevent avoidable evictions on mkdir of existing directories

mkdir -p /foo/bar/baz will mkdir each path component and ignore EEXIST.

The NOCACHE lookup will make the namecache unnecessarily ev

vfs: prevent avoidable evictions on mkdir of existing directories

mkdir -p /foo/bar/baz will mkdir each path component and ignore EEXIST.

The NOCACHE lookup will make the namecache unnecessarily evict the existing entry,
and then fallback to the fs lookup routine eventually leading namei to return an
error as the directory is already there.

For invocations like mkdir -p /usr/obj/usr/src/sys/GENERIC/modules this triggers
fallbacks to the slowpath for concurrently executing lookups.

Tested by: pho
Discussed with: kib

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vfs: drop the de facto curthread argument from VOP_INACTIVE

vfs: drop spurious cred argument from VOP_VPTOCNP

Convert page cache read to VOP.

There are several negative side-effects of not calling into VOP layer
at all for page cache reads. The biggest is the missed activation of
EVFILT_READ knotes.

Also,

Convert page cache read to VOP.

There are several negative side-effects of not calling into VOP layer
at all for page cache reads. The biggest is the missed activation of
EVFILT_READ knotes.

Also, it allows filesystem to make more fine grained decision to
refuse read from page cache.

Keep VIRF_PGREAD flag around, it is still useful for nullfs, and for
asserts.

Reviewed by: markj
Tested by: pho
Discussed with: mjg
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D26346

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vfs: remove the always-curthread td argument from VOP_RECLAIM

vfs: drop the thread argumemnt from vfs_fplookup_vexec

It is guaranteed curthread.

Tested by: pho
Sponsored by: The FreeBSD Foundation

vfs: add VOP_STAT

The current scheme of calling VOP_GETATTR adds avoidable overhead.

An example with tmpfs doing fstat (ops/s):
before: 7488958
after: 7913833

Reviewed by: kib (previous version)

vfs: add VOP_STAT

The current scheme of calling VOP_GETATTR adds avoidable overhead.

An example with tmpfs doing fstat (ops/s):
before: 7488958
after: 7913833

Reviewed by: kib (previous version)
Differential Revision: https://reviews.freebsd.org/D25910

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vfs: inline vops if there are no pre/post associated calls

This removes a level of indirection from frequently used methods, most notably
VOP_LOCK1 and VOP_UNLOCK1.

Tested by: pho

vfs: add the infrastructure for lockless lookup

Reviewed by: kib
Tested by: pho (in a patchset)
Differential Revision: https://reviews.freebsd.org/D25577

vfs: introduce vnode sequence counters

Modified on each permission change and link/unlink.

Reviewed by: kib
Tested by: pho (in a patchset)
Differential Revision: https://reviews.freebsd.org/D25573

vfs: quiet -Wwrite-strings

Reviewed by: kib, markj
Differential Revision: https://reviews.freebsd.org/D23797

vfs: remove the now empty vop_unlock_post

vfs: consistently use size_t for buflen around VOP_VPTOCNP

vfs: replace VOP_MARKATIME with VOP_MMAPPED

The routine is only provided by ufs and is only used on mmap and exec.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D23422