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History log of /src/sbin/fsck_lfs/setup.c
RevisionDateAuthorComments
 1.62  03-Apr-2020  joerg Avoid common symbols for fsck_lfs.
 1.61  17-Mar-2016  christos branches: 1.61.16;
PR/50974: David Binderman: Remove unused code.
 1.60  03-Oct-2015  dholland Fix hardwired 32-bit stuff in fsck:
- compute the maximum file size using LFS_BLKPTRSIZE()
- use the new IINFO in pass 6 instead of uint32_t pointers
- use accessors to read and write indirect blocks
 1.59  01-Sep-2015  dholland Use daddr_t, not ulfs_daddr_t, as the latter's 32 bits wide.
Don't use either for on-disk items.
Declare external data in header files.
Part 3 of 3.
 1.58  01-Sep-2015  dholland Tidy the MAXSYMLINKLEN macros.
 1.57  01-Sep-2015  dholland The ifile's inode number is constant. (it is always 1)

Therefore, storing the value in the superblock and reading it out
again is silly and offers the opportunity for it to become corrupted.
So, don't do that (most of the code already didn't) and use the
existing constant instead. Initialize new 32-bit superblocks with
the value for the sake of old userland programs, but don't keep the
value in the 64-bit superblock at all.

(approved by Margo Seltzer)
 1.56  01-Sep-2015  dholland Use the lfs dinode accessors in place of the ufs-derived ones.
(Mostly.)

The ufs-derived ones are fake structure member macros, which are gross
and not very safe. Also, it seems that a lot of places in the lfs code
were using the ffsv1 branch of them unconditionally, and this way it's
guaranteed all those places have been updated.

Found while doing this: for non-devices, have getattr produce NODEV
in the rdev field instead of leaking the address of the first direct
block.
 1.55  12-Aug-2015  dholland Hack up dinode usage to be 64 vs. 32 as needed. Part 1.

(This part changes the native lfs code; the ufs-derived code already
has 64 vs. 32 logic, but as aspects of it are unsafe, and don't
entirely interoperate cleanly with the lfs 64/32 stuff, pass 2 will be
rehashing that.)
 1.54  12-Aug-2015  dholland Provide 32-bit and 64-bit versions of FINFO.

This also entailed sorting out part of struct segment, as that
contains a pointer into the current FINFO data.
 1.53  12-Aug-2015  dholland Make 32-bit and 64-bit versions of SEGSUM.
Also fix some of the FINFO handling as it's closely entangled.
 1.52  02-Aug-2015  dholland Use accessor functions for the version field of the lfs superblock.
I thought at first maybe the cases that test the version should be
rolled into the accessors, but on the whole I think the conclusion on
that is no.
 1.51  02-Aug-2015  dholland Second batch of 64 -> 32 truncations in lfs, along with more minor
tidyups and corrections in passing.
 1.50  02-Aug-2015  dholland Fix bug: for format version 1, the superblock "size" field is measured
in blocks instead of frags, so use lfs_blkstofrags to correct it.

This code was instead multiplying by the block size divided by
DEV_BSIZE to get the number of disk blocks rather than the number of
frags. (I gather that originally these were the same, but they're not
necessarily any more.)
 1.49  28-Jul-2015  dholland Add a new lfs header file: lfs_accessors.h.

This contains all the accessor functions and macros out of lfs.h.
Add an include of lfs_accessors.h after all uses of lfs.h... except
for code that wants to define its own struct lfs-alike that the
accessors are supposed to play along with. For these, set STRUCT_LFS
and include lfs_accessors.h after the necessary structure has been
defined, so that lfs_accessors.h can emit functions in terms of it.
 1.48  24-Jul-2015  dholland More lfs superblock accessors.
(This changes the rest of the code over; all the accessors were
already added.)

The difference between this commit and the previous one is arbitrary,
but the previous one passed the regression tests on its own so I'm
keeping it separate to help with any bisections that might be needed
in the future.
 1.47  24-Jul-2015  dholland Switch to accessor functions for elements of the LFS on-disk
superblock. This will allow switching between 32/64 bit forms on the
fly; it will also allow handling LFS_EI reasonably tidily. (That
currently doesn't work on the superblock.)

It also gets rid of cpp abuse in the form of fake structure member
macros.

Also, instead of doing sleep/wakeup on &lfs_avail and &lfs_nextseg
inside the on-disk superblock, add extra elements to the in-memory
struct lfs for this. (XXX: these should be changed to condvars, but
not right now)

XXX: this migrates a structure needed by the lfs code in libsa (struct
salfs) into lfs.h, where it doesn't belong, but for the time being
this is necessary in order to allow the accessors (and the various
lfs macros and other goop that relies on them) to compile.
 1.46  31-May-2015  hannken Use VFS_PROTOS() for lfs.
Rename conflicting struct lfs field "lfs_start" to "lfs_s0addr".

No functional change.
 1.45  29-Mar-2015  chopps - Fix fallout for recent bread() change (removing cred arg).
 1.44  18-Jun-2013  christos Prefix most of the cpp macros with lfs_ and LFS_ to avoid conflicts with ffs.
This was done so that boot blocks that want to compile both FFS and LFS in
the same file work.
 1.43  08-Jun-2013  dholland Tidy up the LFS userland build hacks.
Don't use -I${NETBSDSRCDIR}/sys; don't include files other than the
exported LFS headers, which are lfs.h, lfs_inode.h, and (for now)
lfs_extern.h.
 1.42  08-Jun-2013  dholland Move the dinode (on-disk inode) structures to lfs.h, since they are
and will be obviously required by userland tools that need to read
the on-disk structures.

Also, DINODE{1,2}_SIZE -> LFS_DINODE{1,2}_SIZE.
 1.41  06-Jun-2013  dholland Cleanups and hacks to make lfs userland stuff build:
- lfs_cksum.c doesn't actually need ulfs_inode.h any more.
- neither does lfs_itimes.c.
- add hacks to fsck_lfs to make it compile.
- add hacks to newfs_lfs to make it compile.
- fix warning in ulfs_quota.c when quotas are fully disabled
(as I guess is happening with the rumpity version)

XXX: This commit adds -I${NETBSDSRCDIR}/sys to the Makefiles for
XXX: fsck_lfs, newfs_lfs, and lfs_cleanerd. This needs to be cleaned
XXX: up ASAP; but I consider this less problematic in the short term
XXX: than spewing ulfs_*.h into /usr/include.
 1.40  06-Jun-2013  dholland ufs -> ulfs for fsck_lfs.
 1.39  22-Jan-2013  dholland Stuff UFS_ in front of a few of ufs's symbols to reduce namespace
pollution. Specifically:
ROOTINO -> UFS_ROOTINO
WINO -> UFS_WINO
NXADDR -> UFS_NXADDR
NDADDR -> UFS_NDADDR
NIADDR -> UFS_NIADDR
MAXSYMLINKLEN -> UFS_MAXSYMLINKLEN
MAXSYMLINKLEN_UFS[12] -> UFS[12]_MAXSYMLINKLEN (for consistency)

Sort out ext2fs's misuse of NDADDR and NIADDR; fortunately, these have
the same values in ext2fs and ffs.

No functional change intended.
 1.38  29-Aug-2011  bouyer branches: 1.38.2; 1.38.8;
PR bin/45299: print FBMASK not FFMASK when lfs_fbmask is incorrect.
 1.37  16-Feb-2010  mlelstv Three changes in a single commit.

- drop the notion of frags (LFS fragments) vs fsb (FFS fragments)
The code uses a complicated unity function that just makes the
code difficult to understand.

- support larger sector sizes. Fix disk address computations
to use DEV_BSIZE in the kernel as required by device drivers
and to use sector sizes in userland.

- Fix several locking bugs in lfs_bio.c and lfs_subr.c.
 1.36  16-May-2008  hannken Make sure all cached buffers with valid, not yet written data have been
run through copy-on-write. Call fscow_run() with valid data where possible.

The LP_UFSCOW hack is no longer needed to protect ffs_copyonwrite() against
endless recursion.

- Add a flag B_MODIFY to bread(), breada() and breadn(). If set the caller
intends to modify the buffer returned.

- Always run copy-on-write on buffers returned from ffs_balloc().

- Add new function ffs_getblk() that gets a buffer, assigns a new blkno,
may clear the buffer and runs copy-on-write. Process possible errors
from getblk() or fscow_run(). Part of PR kern/38664.

Welcome to 4.99.63

Reviewed by: YAMAMOTO Takashi <yamt@netbsd.org>
 1.35  28-Apr-2008  martin branches: 1.35.2;
Remove clause 3 and 4 from TNF licenses
 1.34  16-Mar-2008  lukem branches: 1.34.2;
errexit() now provides the trailing \n (since fsck_ffs assumed that
from a conversion from err(3)), so "make it so".
 1.33  08-Oct-2007  ad branches: 1.33.6; 1.33.8;
Give brelse() a second argument so that it matches the kernel.
fsck_lfs now compiles again.
 1.32  09-Nov-2006  christos branches: 1.32.8;
Fix malloc/realloc/calloc issues: always check and exit, use EEXIT instead
of 8.
 1.31  16-Oct-2006  christos comment out/delete impossible code
 1.30  01-Sep-2006  perseant Several fixes to improve the reliability of the roll-forward agent.
Also, note "properly orphaned" files as distinct from corrupted files.
 1.29  18-Jul-2006  perseant Various improvements to fsck_lfs, to wit:

* Add lfs_balloc capability to the lfs library.
* Extend the Ifile if we run out of free inodes when creating lost+found.
* Don't roll forward if we have allocated a lost+found, to avoid
conflicts when adding new files in roll-forward.
* Make some messages slightly more verbose (e.g. include inode number,
and use pwarn() instead of printf() so the messages include the device
name when preening).
* Change superblock detection/avoidance to use the offset table in the
primary superblock, rather than looking at the contents.
* Be more verbose about various operations when passed the -d flag,
especially roll-forward.
* Be more careful about dirops during roll forward, since the cleaner can
sometimes write blocks from dirop vnodes. Detect and avoid this problem.
* Always check the free list, even if given -i; if we're going to write
it we have to check it first.
* Mark inodes dirty when blocks are found during roll forward, so the
inodes are written with the new block locations.
* Update size of inodes if blocks beyond EOF are found during roll
forward.
* Fix segment accounting for blocks and inodes found during roll
forward.
* Report statistics on roll forward: how many new/deleted/moved files
and how many updated blocks (or "nothing new").
* Don't care if the device being checked is really a device, if we have
been passed the -f flag (to facilitate automated testing).
* When writing to the disk, use the current time in the segment headers
rathern than time 0.
* When passed the -i flag, locate the partial segment containing the
Ifile inode and use that to calculate lfs_offset, lfs_curseg,
lfs_nextseg. (Again for automated testing.)
 1.28  28-Apr-2006  perseant Avoid a core dump if ginode() returns NULL. Correct an error message
while we're here.
 1.27  17-Apr-2006  perseant Remove the free list ordering/disordering code, since the kernel now keeps
the list in order (ordering it on mount).

Regularize error messages: these are now all in ALL CAPS, with all hex
numbers (not reported in caps) prefixed by 0x. (The non-fsck-specific
messages are an exception to this all-caps rule.)
 1.26  13-Sep-2005  christos rename lfs.h to lfs_user.h so that it does not conflict.
 1.25  19-Aug-2005  christos 64 bit inode changes
 1.24  08-Jun-2005  perseant Use the correct method to create a new inode, when we allocate lost+found.

Correct uninitialized variable issues in pass6.c and dir.c (PR#30411 and
PR#30394, respectively).
 1.23  24-May-2005  agc Make this build on arm platforms by using the correct printf formats.
 1.22  23-May-2005  perseant Check some error conditions that would otherwise cause fsck_lfs to dump core.
Pointed out by Pavel Cahyna in a follow-on to PR #29151.
 1.21  14-Apr-2005  perseant Document "-f" (force check) flag. Implement and document "-q" (quiet).
 1.20  11-Apr-2005  perseant Be more efficient with the hash tables for the buffer and vnode caches.

Note that roll-forward can add more inodes to the filesystem; don't overflow
the tables but reallocate them.
 1.19  26-Feb-2005  perseant branches: 1.19.2;
Various minor LFS improvements:

* Extend the lfs library from fsck_lfs(8) so that it can be used with a
not-yet-existent LFS. Make newfs_lfs(8) use this library, so it can
create LFSs whose Ifile is larger than one segment.
* Make newfs_lfs(8) use strsuftoi64() for its arguments, a la newfs(8).
* Make fsck_lfs(8) respect the "file system is clean" flag.
* Don't let fsck_lfs(8) think it has dirty blocks when invoked with the
-n flag.
 1.18  15-Sep-2004  minoura Changes from rev 1.34 and 1.35 of sbin/newfs_lfs/lfs.c.
 1.17  07-Aug-2003  agc branches: 1.17.4;
Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22308, verified by myself.
 1.16  02-Apr-2003  fvdl Add support for UFS2. UFS2 is an enhanced FFS, adding support for
64 bit block pointers, extended attribute storage, and a few
other things.

This commit does not yet include the code to manipulate the extended
storage (for e.g. ACLs), this will be done later.

Originally written by Kirk McKusick and Network Associates Laboratories for
FreeBSD.
 1.15  31-Mar-2003  perseant Check inode free list tail pointer as well as head pointer, and write both
into the CLEANERINFO block of the Ifile as well as into the superblock.
Make preen update both superblocks.
 1.14  29-Mar-2003  perseant Fix some accounting problems when preening, since preening skips phases
1-4 entirely. Make preen run phase 0, since the Ifile is so important
and the test so quick.
 1.13  28-Mar-2003  perseant Add working writing ability to fsck_lfs, including roll-forward, based on
a partial-segment writer ported from the kernel.
 1.12  24-Jan-2003  fvdl Bump daddr_t to 64 bits. Replace it with int32_t in all places where
it was used on-disk, so that on-disk formats remain the same.
Remove ufs_daddr_t and ufs_lbn_t for the time being.
 1.11  04-Feb-2002  perseant Walk the segment list correctly when rolling forward between the two
primary superblocks. This prevents spurious "block could not be read"
messages that might otherwise be seen if the filesystem had not been
properly unmounted.
 1.10  25-Sep-2001  wiz Fix a typo and two white space nits.
 1.9  13-Jul-2001  perseant Merge the short-lived perseant-lfsv2 branch into the trunk.

Kernels and tools understand both v1 and v2 filesystems; newfs_lfs
generates v2 by default. Changes for the v2 layout include:

- Segments of non-PO2 size and arbitrary block offset, so these can be
matched to convenient physical characteristics of the partition (e.g.,
stripe or track size and offset).

- Address by fragment instead of by disk sector, paving the way for
non-512-byte-sector devices. In theory fragments can be as large
as you like, though in reality they must be smaller than MAXBSIZE in size.

- Use serial number and filesystem identifier to ensure that roll-forward
doesn't get old data and think it's new. Roll-forward is enabled for
v2 filesystems, though not for v1 filesystems by default.

- The inode free list is now a tailq, paving the way for undelete (undelete
is not yet implemented, but can be without further non-backwards-compatible
changes to disk structures).

- Inode atime information is kept in the Ifile, instead of on the inode;
that is, the inode is never written *just* because atime was changed.
Because of this the inodes remain near the file data on the disk, rather
than wandering all over as the disk is read repeatedly. This speeds up
repeated reads by a small but noticeable amount.

Other changes of note include:

- The ifile written by newfs_lfs can now be of arbitrary length, it is no
longer restricted to a single indirect block.

- Fixed an old bug where ctime was changed every time a vnode was created.
I need to look more closely to make sure that the times are only updated
during write(2) and friends, not after-the-fact during a segment write,
and certainly not by the cleaner.
 1.8  05-Jan-2001  lukem branches: 1.8.2;
use %ll_ instead of the less standard %q_
 1.7  04-Oct-2000  jdolecek setup(): use calloc() for blockmap allocation, instead of malloc() followed
by bzero(); the net result is that the test for allocation failure
is actually sensible now
 1.6  14-Jun-2000  perseant Add "-i" flag to specify the location of the index file inode, to
examine alternate checkpoints. Regularize usage of maxino. Remove olf
debugging cruft.
 1.5  23-May-2000  perseant branches: 1.5.2;
Convert to NetBSD source code style
 1.4  16-May-2000  perseant fsck_lfs can now write to the filesystem, allowing it to correct most
(though still not all) errors in a damaged lfs. Segment byte accounting
is corrected in pass 5. "fsck_lfs -p" will do a partial roll-forward,
verifying the checkpoint from the newer superblock. fscknames[] is
updated so that fsck knows about fsck_lfs.
 1.3  03-Jul-1999  kleink RCS Id police.
 1.2  24-Mar-1999  nathanw printf format fixes for Alpha.
 1.1  18-Mar-1999  perseant Initial checkin of fsck_lfs. This version cannot do any repair (-p flag
does nothing, and one of -p or -n is required) but can be useful as a
diagnostic tool.
 1.5.2.1  22-Jun-2000  minoura Sync w/ netbsd-1-5-base.
 1.8.2.3  02-Jul-2001  perseant Change disk addressing unit to be the fragment, instead of the disk sector.
All quantities in the superblock, inodes, indirect blocks, etc. refer now
to this abstract unit (called "fsb" as it is in FFS) instead of disk sectors;
as a consequence segment summary blocks have to be multiples of a fragment in
size. In v1 filesystems, compatibility code ensures that 1 fsb == 1 sector,
regardless of fragment size.

Fragments can now range in size between 512 and 32k; in the event that
LFS_LABELPAD (8k) is smaller than the disk address unit size, an extra
proto-superblock is kept at 8k from the beginning of the disk, to be used
*only* to locate the real superblocks. (Not all of the userland knows about
this yet.)

Almost all of this was done not by me, but by joff.
 1.8.2.2  30-Jun-2001  perseant Fixes, from joff, for correct compatibility operation of fsck_lfs, dumplfs,
lfs_cleanerd; correct usage message from dumplfs.
 1.8.2.1  27-Jun-2001  perseant Import of what I've been calling "LFSv2", that is, LFS with some features
added that require changes to the on-disk data structures. These include:

- 64-bit time in everything but inodes
- User-specified segment offset, and segment size no longer
restricted to PO2.
- Serial number on segment summaries in addition to timestamp, and
a new volume identifier, to make roll-forward feasible without
fear of finding old data and thinking it was new.

Although I think this version works at least as well as what's on the trunk,
we're not done yet; hence this commit is going in on a branch and not on
the trunk. Enhancements that are not here yet include fragment addressing,
like FFS does, instead of block addressing.
 1.17.4.1  10-May-2005  riz Pull up the following revisions (requested by perseant in ticket #1281):

1.8 sys/ufs/lfs/TODO
1.75 sys/ufs/lfs/lfs.h (via patch)
1.74 sys/ufs/lfs/lfs_alloc.c (via patch)
1.49, 1.51 sys/ufs/lfs/lfs_balloc.c (1.51 via patch)
1.78 sys/ufs/lfs/lfs_bio.c
1.62 sys/ufs/lfs/lfs_extern.h (via patch)
1.156 sys/ufs/lfs/lfs_segment.c (via patch)
1.48 sys/ufs/lfs/lfs_subr.c
1.101 sys/ufs/lfs/lfs_syscalls.c
1.163 sys/ufs/lfs/lfs_vfsops.c (via patch)
1.134 sys/ufs/lfs/lfs_vnops.c (via patch)
1.61 sys/ufs/ufs/ufs_readwrite.c (via patch)

1.20 libexec/lfs_cleanerd/clean.h (via patch)
1.52 libexec/lfs_cleanerd/cleanerd.c (via patch)
1.41 libexec/lfs_cleanerd/library.c (via patch)

1.4 regress/sys/fs/lfs/newfs_fsck/Makefile
1.2 regress/sys/fs/lfs/newfs_fsck/mkfs_mount
1.2 regress/sys/fs/lfs/newfs_fsck/smallfiles
1.3 sbin/fsck_lfs/bufcache.c
1.3 sbin/fsck_lfs/bufcache.h
1.3 sbin/fsck_lfs/lfs.h
1.8 sbin/fsck_lfs/lfs.c (via patch)
1.8 sbin/fsck_lfs/pass3.c (via patch)
1.18 sbin/fsck_lfs/pass0.c (via patch)
1.18 sbin/fsck_lfs/utilities.c (via patch)
1.7 sbin/fsck_lfs/segwrite.c
1.19 sbin/fsck_lfs/setup.c (via patch)
1.3 sbin/newfs_lfs/Makefile
0 sbin/newfs_lfs/lfs.c (yes, remove it)
1.1 sbin/newfs_lfs/make_lfs.c
1.15 sbin/newfs_lfs/newfs.c (via patch)

Various minor LFS improvements.

Kernel:

* Note when lfs_putpages(9) thinks it is not going to be writing any
pages before calling genfs_putpages(9). This prevents a situation in
which blocks can be queued for writing without a segment header.
* Correct computation of NRESERVE(), though it is still a gross
overestimate in most cases. Note that if NRESERVE() is too high, it
may be impossible to create files on the filesystem. We catch this
case on filesystem mount and refuse to mount r/w.
* Allow filesystems to be mounted whose block size is == MAXBSIZE.
* Somewhere along the line, ufs_bmaparray(9) started mangling UNWRITTEN
entries in indirect blocks again, triggering a failed assertion "daddr
<= LFS_MAX_DADDR". Explicitly convert to and from int32_t to correct
this. Should fix PR #29045.
* Add a high-water mark for the number of dirty pages any given LFS can
hold before triggering a flush. This is settable by sysctl, but off
(zero) by default.
* Be more careful about the MAX_BYTES and MAX_BUFS computations so we
shouldn't see "please increase to at least zero" messages.
* Note that VBLK and VCHR vnodes can have nonzero values in di_db[0]
even though their v_size == 0. Don't panic when we see this.
Fixes PR #26680.
* Change lfs_bfree to a signed quantity. The manner in which it is
processed before being passed to the cleaner means that sometimes it
may drop below zero, and the cleaner must be aware of this.
* Never report bfree < 0 (or higher than lfs_dsize) through
lfs_statfs(9). This prevents df(1) from ever telling us that our full
filesystems have 16TB free.
* Account space allocated through lfs_balloc(9) that does not have
associated buffer headers, so that the pagedaemon doesn't run us out
of segments.
* Return ENOSPC from lfs_balloc(9) when bfree drops to zero.
* Address a deadlock in lfs_bmapv/lfs_markv when the filesystem is being
unmounted. Because vfs_busy() is a shared lock, and
lfs_bmapv/lfs_markv mark the filesystem vfs_busy(), the cleaner can be
holding the lock that umount() is blocking on, then try to vfs_busy()
again in getnewvnode().

cleaner:

* Adapt lfs_cleanerd to use the fcntl call to get the Ifile filehandle,
so it need not be in the namespace.
* Make lfs_cleanerd be more careful when there are very few available
segments.
* Make lfs_cleanerd less verbose when the filesystem is unmounted.

newfs_lfs, fsck_lfs, and regression:

* Extend the lfs library from fsck_lfs(8) so that it can be used with a
not-yet-existent LFS. Make newfs_lfs(8) use this library, so it can
create LFSs whose Ifile is larger than one segment. Addresses PR #11110.
* Make newfs_lfs(8) use strsuftoi64() for its arguments, a la newfs(8).
* Make fsck_lfs(8) respect the "file system is clean" flag.
* Don't let fsck_lfs(8) think it has dirty blocks when invoked with the
-n flag.
* Remove the Ifile from the filesystem namespace. The cleaner now uses
a fcntl call on the root inode to find the Ifile filehandle. (As a
side-effect, addresses PR #29144.)
 1.19.2.1  07-May-2005  tron Apply patch (requested by perseant in ticket #242):
* fsck_lfs buffer cache fixes, including PR #29151
* Change fsck_lfs phase 0 message to reflect reality
* fsck_lfs: check phase 5 (cleanerinfo accounting) even on
roll-forward
* Keep better track of the free list during roll-forward, avoiding
a core dump
* Improve hash table use for fsck_lfs buffer and vnode cache
* Document fsck_lfs flag -f, and implement -q
* Add resize_lfs, including kernel support
* Add LFS to mountd's list of exportable filesystem types
* Make the LFS lkm work again [christos@]
* Add MP locking to the LFS kernel subsystem
* Fix pager_map deadlock in lfs_putpages()
* Avoid incomplete file extension that looks like "partial
truncation" to fsck
* Use lfs_malloc for cleaner malloc, since the cleaner often runs
in low-memory conditions.
* Use splay trees, not hash table, to track page allocation for
write.
* Fix mkdir panic on full fs
* Fix page accounting leak by counting differently.
* Use rightly named structure for lfs_getattr [skrll@]
* Cosmetic changes for readability.
 1.32.8.2  23-Mar-2008  matt sync with HEAD
 1.32.8.1  06-Nov-2007  matt sync with HEAD
 1.33.8.2  02-Jun-2008  mjf Sync with HEAD.
 1.33.8.1  03-Apr-2008  mjf Sync with HEAD.
 1.33.6.1  24-Mar-2008  keiichi sync with head.
 1.34.2.1  18-May-2008  yamt sync with head.
 1.35.2.1  23-Jun-2008  wrstuden Sync w/ -current. 34 merge conflicts to follow.
 1.38.8.2  23-Jun-2013  tls resync from head
 1.38.8.1  25-Feb-2013  tls resync with head
 1.38.2.2  22-May-2014  yamt sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs. ("Protocol error: too many arguments")
 1.38.2.1  23-Jan-2013  yamt sync with head
 1.61.16.1  08-Apr-2020  martin Merge changes from current as of 20200406

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