tarfs: Don't use IO_DIRECT when reading from tarball.

Sponsored by: Juniper Networks, Inc.
Sponsored by: Klara, Inc.
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D40612

tarfs: Use a separate debug bit for bounce buffer usage.

Sponsored by: Juniper Networks, Inc.
Sponsored by: Klara, Inc.
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D38588

tarfs: Fix issues revealed by static analysis and testing.

* tarfs_alloc_mount(): Remove an unnecessary null check (CID 1504505) and an unused variable.

* tarfs_alloc_one(): Verify that the file si

tarfs: Fix issues revealed by static analysis and testing.

* tarfs_alloc_mount(): Remove an unnecessary null check (CID 1504505) and an unused variable.

* tarfs_alloc_one(): Verify that the file size is not negative (CID 1504506). While there, also validate the mode, owner and group.

* tarfs_vget(), tarfs_zio_init(): Explicitly ignore return value from getnewvnode(), which cannot fail (CID 1504508)

* tarfs_lookup_path(): Fix a case where a specially-crafted tarball could trigger a null pointer dereference by first descending into, and then backing out of, a previously unknown directory. (CID 1504515)

* mktar: Construct a tarball that triggers the aforementioned null pointer dereference.

Reported by: Coverity
Sponsored by: Juniper Networks, Inc.
Sponsored by: Klara, Inc.
Reviewed by: imp, kib
Differential Revision: https://reviews.freebsd.org/D38463

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tarfs: Silence warnings when no supported compression is enabled.

Some of the code in sys/fs/tarfs/tarfs_io.c is not specific to zstd, but is still only used when some form of decompression is enabl

tarfs: Silence warnings when no supported compression is enabled.

Some of the code in sys/fs/tarfs/tarfs_io.c is not specific to zstd, but is still only used when some form of decompression is enabled. Put it behind #ifdef TARFS_ZIO to silence warnings.

Sponsored by: Juniper Networks, Inc.
Sponsored by: Klara, Inc.
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D38415

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tarfs: Remove unnecessary code.

Reported by: kib
Sponsored by: Juniper Networks, Inc.
Sponsored by: Klara, Inc.
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D38401

tarfs: Fix non-ZSTDIO build.

Sponsored by: Juniper Networks, Inc.
Sponsored by: Klara, Inc.

Add tarfs, a filesystem backed by tarballs.

Sponsored by: Juniper Networks, Inc.
Sponsored by: Klara, Inc.
Reviewed by: pauamma, imp
Differential Revision: https://reviews.freebsd.org/D37753