uiomove_object_page(): Avoid instantiating pages in sparse regions on reads.

Check whether the page being requested is either resident or on swap. If
not, read from the zero_region instead of insta

uiomove_object_page(): Avoid instantiating pages in sparse regions on reads.

Check whether the page being requested is either resident or on swap. If
not, read from the zero_region instead of instantiating an unnecessary page.

This avoids consuming memory for sparse files on tmpfs, when they are read
by applications that do not use SEEK_HOLE/SEEK_DATA (which is most of them).

Reviewed by: kib
MFC after: 1 week
Sponsored by: Spectra Logic

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fd: remove filedesc argument from fdclose

Just accept a thread instead. This makes it consistent with fdalloc.

No functional changes.

Merge from HEAD

MFH: r278202,r278205-r278590

Sponsored by: The FreeBSD Foundation

Merge ^/head r278351 through r278498.

Preset the object's color, or alignment, to maximize superpage usage.

MFC after: 5 days

Merge from head@274682

Sync to HEAD@r272516.

IFC @r272185

Add a new fo_fill_kinfo fileops method to add type-specific information to
struct kinfo_file.
- Move the various fill_*_info() methods out of kern_descrip.c and into the
various file type implement

Add a new fo_fill_kinfo fileops method to add type-specific information to
struct kinfo_file.
- Move the various fill_*_info() methods out of kern_descrip.c and into the
various file type implementations.
- Rework the support for kinfo_ofile to generate a suitable kinfo_file object
for each file and then convert that to a kinfo_ofile structure rather than
keeping a second, different set of code that directly manipulates
type-specific file information.
- Remove the shm_path() and ksem_info() layering violations.

Differential Revision: https://reviews.freebsd.org/D775
Reviewed by: kib, glebius (earlier version)

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IFC @r271694

Fix various issues with invalid file operations:
- Add invfo_rdwr() (for read and write), invfo_ioctl(), invfo_poll(),
and invfo_kqfilter() for use by file types that do not support the
respectiv

Fix various issues with invalid file operations:
- Add invfo_rdwr() (for read and write), invfo_ioctl(), invfo_poll(),
and invfo_kqfilter() for use by file types that do not support the
respective operations. Home-grown versions of invfo_poll() were
universally broken (they returned an errno value, invfo_poll()
uses poll_no_poll() to return an appropriate event mask). Home-grown
ioctl routines also tended to return an incorrect errno (invfo_ioctl
returns ENOTTY).
- Use the invfo_*() functions instead of local versions for
unsupported file operations.
- Reorder fileops members to match the order in the structure definition
to make it easier to spot missing members.
- Add several missing methods to linuxfileops used by the OFED shim
layer: fo_write(), fo_truncate(), fo_kqfilter(), and fo_stat(). Most
of these used invfo_*(), but a dummy fo_stat() implementation was
added.

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Sync to HEAD@r271160.

IFC @r269962

Submitted by: Anish Gupta (akgupt3@gmail.com)

Rename shm_dict_init to shm_init to fix a compiler warning.

Reviewed by: jhb

Use a unit number allocator to provide suitable st_dev and st_ino values
for POSIX shared memory descriptors. The implementation is similar to
that used for pipes.

MFC after: 1 week

Merge head from 7/28

Sync to HEAD@r269943.

If vm_page_grab() allocates a new page, the page is not inserted into
page queue even when the allocation is not wired. It is
responsibility of the vm_page_grab() caller to ensure that the page
does

If vm_page_grab() allocates a new page, the page is not inserted into
page queue even when the allocation is not wired. It is
responsibility of the vm_page_grab() caller to ensure that the page
does not end on the vm_object queue but not on the pagedaemon queue,
which would effectively create unpageable unwired page.

In exec_map_first_page() and vm_imgact_hold_page(), activate the page
immediately after unbusying it, to avoid leak.

In the uiomove_object_page(), deactivate page before the object is
unlocked. There is no leak, since the page is deactivated after
uiomove_fromphys() finished. But allowing non-queued non-wired page
in the unlocked object queue makes it impossible to assert that leak
does not happen in other places.

Reviewed by: alc
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

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In the shm_open() and shm_unlink() syscalls, export the path to KTR.

MFC after: 1 week

For md(4), posix shm(3) and tmpfs(5), free swap space used by paged in
dirty page, which is written by the process.

Reviewed by: alc
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1

For md(4), posix shm(3) and tmpfs(5), free swap space used by paged in
dirty page, which is written by the process.

Reviewed by: alc
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

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MFC @ r266724

An SVM update will follow this.

Merge head

IFC @264767

Merge head up to r263906.