Add an implementation of the 9P filesystem

This is derived from swills@ fork of the Juniper virtfs with many
changes by me including bug fixes, style improvements, clearer layering
and more consiste

Add an implementation of the 9P filesystem

This is derived from swills@ fork of the Juniper virtfs with many
changes by me including bug fixes, style improvements, clearer layering
and more consistent logging. The filesystem is renamed to p9fs to better
reflect its function and to prevent possible future confusion with
virtio-fs.

Several updates and fixes from Juniper have been integrated into this
version by Val Packett and these contributions along with the original
Juniper authors are credited below.

To use this with bhyve, add 'virtio_p9fs_load=YES' to loader.conf. The
bhyve virtio-9p device allows access from the guest to files on the host
by mapping a 'sharename' to a host path. It is possible to use p9fs as a
root filesystem by adding this to /boot/loader.conf:

vfs.root.mountfrom="p9fs:sharename"

for non-root filesystems add something like this to /etc/fstab:

sharename /mnt p9fs rw 0 0

In both examples, substitute the share name used on the bhyve command
line.

The 9P filesystem protocol relies on stateful file opens which map
protocol-level FIDs to host file descriptors. The FreeBSD vnode
interface doesn't really support this and we use heuristics to guess the
right FID to use for file operations. This can be confused by privilege
lowering and does not guarantee that the FID created for a given file
open is always used for file operations, even if the calling process is
using the file descriptor from the original open call. Improving this
would involve changes to the vnode interface which is out-of-scope for
this import.

Differential Revision: https://reviews.freebsd.org/D41844
Reviewed by: kib, emaste, dch
MFC after: 3 months
Co-authored-by: Val Packett <val@packett.cool>
Co-authored-by: Ka Ho Ng <kahon@juniper.net>
Co-authored-by: joyu <joyul@juniper.net>
Co-authored-by: Kumara Babu Narayanaswamy <bkumara@juniper.net>

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sys: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remov

sys: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

Sponsored by: Netflix

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Replace random sbuf_printf() with cheaper cat/putc.

sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

vfs: fix up NDFREE_PNBUF usage in vfs_mountroot_shuffle

Noted by: karels

linux(4): Add a dedicated statat() implementation

Get rid of calling Linux stat translation hook and specific to Linux
handling of non-vnode dirfd from kern_statat(),

Reviewed by: kib, mjg
Differe

linux(4): Add a dedicated statat() implementation

Get rid of calling Linux stat translation hook and specific to Linux
handling of non-vnode dirfd from kern_statat(),

Reviewed by: kib, mjg
Differential revision: https://reviews.freebsd.org/D35474

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vfs: s/ppsratecheck/eventratecheck

nfc

ufs/ffs: detect endian mismatch between machine and filesystem

Mount on a LE machine a filesystem formatted for BE is not supported
currently. This adds a check for the superblock magic number using

ufs/ffs: detect endian mismatch between machine and filesystem

Mount on a LE machine a filesystem formatted for BE is not supported
currently. This adds a check for the superblock magic number using
swapped bytes to guess and warn the user that it may be a valid
superblock but endian is incompatible.

MFC after: 2 weeks
Reviewed by: mckusick
Obtained from: mckusick, alfredo
Differential Revision: https://reviews.freebsd.org/D37675

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vfs: clean up parse_mount_dev_present

vfs: fixup parse_mount_dev_present after 5b5b7e2ca2fa9a2418dd51749f4ef6f881ae7179

Reported by: kib

Adjust g_waitidle() visibility and definition

Explicitly pass the struct thread argument.
Move the function prototype from sys/systm.h to geom/geom.h, we do not
need almost each kernel source to see

Adjust g_waitidle() visibility and definition

Explicitly pass the struct thread argument.
Move the function prototype from sys/systm.h to geom/geom.h, we do not
need almost each kernel source to see the prototype, it is now used
only by kern/vfs_mountroot.c outside geom/geom_event.c, where the
function is defined.

Reviewed by: markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D35888

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sysent: Get rid of bogus sys/sysent.h include.

Where appropriate hide sysent.h under proper condition.

MFC after: 2 weeks

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

vfs_mountroot: Check for root dev before waiting

If GEOM is idle but the root device is not yet present when we enter
vfs_mountroot_wait_if_necessary, we call vfs_mountroot_wait to wait
for root hol

vfs_mountroot: Check for root dev before waiting

If GEOM is idle but the root device is not yet present when we enter
vfs_mountroot_wait_if_necessary, we call vfs_mountroot_wait to wait
for root holds (e.g. CAM or USB initialization). Upon returning from
vfs_mountroot_wait, we wait 100 ms at a time until the root device
shows up.

Since the root device most likely appeared during vfs_mountroot_wait
-- waiting for subsystems which may be responsible for the root
device is the whole purpose of that function -- it makes sense to
check if the device is now present rather than printing a warning
and pausing for 100 ms before checking.

Reviewed by: trasz
Fixes: a3ba3d09c248 Make root mount wait mechanism smarter
Sponsored by: https://www.patreon.com/cperciva
Differential Revision: https://reviews.freebsd.org/D33593

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vfs_mountroot: Wait for GEOM idle post root holds

In the case of a root hold related to the initialization of a disk
device, a flurry of GEOM tasting is likely to take place as soon as
the device is

vfs_mountroot: Wait for GEOM idle post root holds

In the case of a root hold related to the initialization of a disk
device, a flurry of GEOM tasting is likely to take place as soon as
the device is initialized and the root hold is released. If we
don't wait for GEOM idle it's easy for vfs_mountroot to "win" the
race and proceed before the root filesystem GEOM is ready.

Reviewed by: imp
Sponsored by: https://www.patreon.com/cperciva
Differential Revision: https://reviews.freebsd.org/D33592

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vfs_mountroot: Skip 'Root mount waiting' < 1 s

While the message is technically correct, it's not particularly
helpful in the case where we're only waiting a few ms; this case
occurs frequently on E

vfs_mountroot: Skip 'Root mount waiting' < 1 s

While the message is technically correct, it's not particularly
helpful in the case where we're only waiting a few ms; this case
occurs frequently on EC2 arm64 instances with CAM initialization
racing to release its root hold before vfs_mountroot reaches this
point. Only print the message if we end up waiting for more than
one second.

Sponsored by: https://www.patreon.com/cperciva
Differential Revision: https://reviews.freebsd.org/D33591

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vfs: remove the unused thread argument from NDINIT*

See b4a58fbf640409a1 ("vfs: remove cn_thread")

Bump __FreeBSD_version to 1400043.

vfs: add missing VIRF_MOUNTPOINT in vfs_mountroot_shuffle

Reported by: mav

vfs: add the missing vnode interlock in vfs_mountroot_shuffle

Around v_mountedhere assignment.

vfs: Initialize "lastfail" in vfs_mountroot_wait()

This variable is only used to rate-limit "Root mount waiting for: ..."
messages using ppsratecheck().

Reported by: KMSAN
MFC after: 1 week
Sponsor

vfs: Initialize "lastfail" in vfs_mountroot_wait()

This variable is only used to rate-limit "Root mount waiting for: ..."
messages using ppsratecheck().

Reported by: KMSAN
MFC after: 1 week
Sponsored by: The FreeBSD Foundation

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kern: mountroot: avoid fd leak in .md parsing

parse_dir_md() opens /dev/mdctl but only closes the resulting fd on
success, not upon failure of the ioctl or when we exceed the md unit
max.

Reviewed

kern: mountroot: avoid fd leak in .md parsing

parse_dir_md() opens /dev/mdctl but only closes the resulting fd on
success, not upon failure of the ioctl or when we exceed the md unit
max.

Reviewed by: kib (slightly previous version)
Sponsored by: NetApp, Inc.
Sponsored by: Klara, Inc.
X-NetApp-PR: #62
Differential Revision: https://reviews.freebsd.org/D31229

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Minor style tidy: if( -> if (

Fix a few 'if(' to be 'if (' in a few places, per style(9) and
overwhelming usage in the rest of the kernel / tree.

MFC After: 3 days
Sponsored by: Netflix

vfs: denote vnode being a mount point with VIRF_MOUNTPOINT

Reviewed by: kib (previous version)
Differential Revision: https://reviews.freebsd.org/D27794

cache: drop the force flag from purgevfs

The optional scan is wasteful, thus it is removed altogether from unmount.

Callers which always want it anyway remain unaffected.

vfs: fix trivial whitespace issues which don't interefere with blame

.. even without the -w switch