[RFC][CFT][PATCHES] fs/ufs cleanups and fixes

[Al Viro <viro@zeniv.linux.org.uk>]

	A bunch of UFS patches of different age; most of that had
been sitting in my tree for quite a while.  This stuff survives
xfstests (with mkfs.ufs and fsck.ufs from old debian ufsutils
and
export FSTYP=ufs
export MOUNT_OPTIONS="-o ufstype=ufs2"
export SCRATCH_OPTIONS="-o ufstype=ufs2"
export TEST_FS_MOUNT_OPTS="-o ufstype=ufs2"
in local.config); review and more testing would be welcome.

It still has... interesting issues around block relocation we had
since 2.3.early, but to deal with that we'll need an iomap conversion
and that requires quite a bit of untangling of inode.c and balloc.c;
some of that is done in that pile, so hopefully we'll get there.

Branch is in git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git #work.ufs,
individual patches in followups.

If there's no objections, I'm going to put that into -next (either
via viro/vfs.git or vfs/vfs.git; AFAIK there's no dedicated UFS git
tree).

Shortlog:
Al Viro (12):
      ufs: fix handling of delete_entry and set_link failures
      ufs: missing ->splice_write()
      ufs: fix ufs_read_cylinder() failure handling
      ufs: untangle ubh_...block...() macros, part 1
      ufs: untangle ubh_...block...(), part 2
      ufs: untangle ubh_...block...(), part 3
      ufs_clusteracct(): switch to passing fragment number
      ufs_free_fragments(): fix the braino in sanity check
      ufs_inode_getfrag(): remove junk comment
      ufs: get rid of ubh_{ubhcpymem,memcpyubh}()
      clean ufs_trunc_direct() up a bit...
      ufs: take the handling of free block counters into a helper

Matthew Wilcox (Oracle) (5):
      ufs: Convert ufs_inode_getblock() to take a folio
      ufs: Convert ufs_extend_tail() to take a folio
      ufs: Convert ufs_inode_getfrag() to take a folio
      ufs: Pass a folio to ufs_new_fragments()
      ufs: Convert ufs_change_blocknr() to take a folio

Diffstat:
 fs/ufs/balloc.c   | 107 ++++++++++++++------------------
 fs/ufs/cylinder.c |  31 ++++++----
 fs/ufs/dir.c      |  29 +++++----
 fs/ufs/file.c     |   1 +
 fs/ufs/inode.c    | 179 +++++++++++++++++++++++-------------------------------
 fs/ufs/namei.c    |  39 ++++++------
 fs/ufs/super.c    |  45 ++++++--------
 fs/ufs/ufs.h      |  12 ++--
 fs/ufs/util.c     |  46 --------------
 fs/ufs/util.h     |  61 +++++++++----------
 10 files changed, 222 insertions(+), 328 deletions(-)