CVS log for src/sys/ufs/ffs/ffs_extattr.c

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the UFS_EXTATTR option was supposed to affect only UFS1 file systems,
but when the UFS2 extattr code was merged, the UFS_EXTATTR option was
mistakenly changed to affect UFS2 file systems as well.  this commit
changes UFS_EXTATTR back to affecting only UFS1 file systems as originally
intended.  in UFS2 (or rather UFS2ea in NetBSD), extattrs are a
native feature and are always supported.

Restore backward compatibility of UFS2 with previous NetBSD releases by
disabling support in UFS2 for extended attributes (including ACLs).
Add a new variant of UFS2 called "UFS2ea" that does support extended attributes.
Add new	fsck_ffs operations "-c	ea" and	"-c no-ea" to convert file systems
from UFS2 to UFS2ea and	vice-versa (both of which delete all existing extended
attributes in the process).

ffs: fix the creation of device nodes on file systems with ACLs enabled.

Round of uvm.h cleanup.

The poorly named uvm.h is generally supposed to be for uvm-internal
users only.

- Narrow it to files that actually need it -- mostly files that need
  to query whether curlwp is the pagedaemon, which should maybe be
  exposed by an external header.

- Use uvm_extern.h where feasible and uvm_*.h for things not exposed
  by it.  We should split up uvm_extern.h but this will serve for now
  to reduce the uvm.h dependencies.

- Use uvm_stat.h and #ifdef UVMHIST uvm.h for files that use
  UVMHIST(ubchist), since ubchist is declared in uvm.h but the
  reference evaporates if UVMHIST is not defined, so we reduce header
  file dependencies.

- Make uvm_device.h and uvm_swap.h independently includable while
  here.

ok chs@

remove accmode_t typedef (not needed, breaks llvm) from maxv@

Add ACL support for FFS. From FreeBSD.

Remove the unlock/relock hack by using IO_EXT to indicate that we are already
holding the lock.

Sync with bouyer-xenpvh-base2 (HEAD)

Sync with HEAD

file ffs_extattr.c was added on branch phil-wifi on 2020-04-21 18:42:45 +0000

- Allow root to set system attributes, samba does this
- Fix locking issue, perhaps we should use our own mutex; does not seem worth
  it for this simple case.

Sync with HEAD

file ffs_extattr.c was added on branch bouyer-xenpvh on 2020-04-20 11:29:14 +0000

- add locking
- wrap wapbl around truncating, ffs_extwrite does it on its own.

Extended attribute support for ffsv2, from FreeBSD.