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History log of /src/sys/fs/union/union_subr.c
RevisionDateAuthorComments
 1.82  18-Jul-2022  thorpej Make kqueue event status for vnodes shareable, and for stacked file systems
like nullfs, make the upper vnode share that status with the lower vnode.

And, lo, NetBSD 9.99.99.

Fixes PR kern/56713.
 1.81  19-Mar-2022  hannken Remove now unused VV_LOCKSWORK, all file systems support locking.

Remove unused predicates vn_locked() and vn_anylocked().

Welcome to 9.99.95
 1.80  19-Mar-2022  hannken As FSTRANS is part of VOP_*LOCK() since June 4, 2017 the vdead_check()
from union_lock() is no longer needed.

Adapt union_lock() to the recent addition of upgrade or downgrade.

VV_LOCKSWORK now.
 1.79  18-Aug-2020  hannken Operation union_readdirhook() stores the lower directory as un_uppervp.
This breaks the assumption that un_uppervp->v_mount is the upper mount.

Fix by storing the directory as un_lowervp and adapt union_readdir().

Should fix PR kern/55552: panic with union mount
 1.78  23-Feb-2020  ad UVM locking changes, proposed on tech-kern:

- Change the lock on uvm_object, vm_amap and vm_anon to be a RW lock.
- Break v_interlock and vmobjlock apart. v_interlock remains a mutex.
- Do partial PV list locking in the x86 pmap. Others to follow later.
 1.77  28-Jan-2018  christos branches: 1.77.4; 1.77.8; 1.77.10;
CID-1428639: make sure we always initialiaze hash, because if ultimately
the file is not found and we end up looping we need them.
 1.76  17-Jul-2017  hannken branches: 1.76.2;
Make union_newlower() ans union_newupper() local to union_subr.c,
expand and remove union_updatevp() and take care to transfer the
vnode lock from the union vnode to its new upper vnode without
breaking the fstrans state.

Add assertions that un_lowervp and un_uppervp never change from
non-NULL to non-NULL.
 1.75  01-Jun-2017  chs branches: 1.75.2;
remove checks for failure after memory allocation calls that cannot fail:

kmem_alloc() with KM_SLEEP
kmem_zalloc() with KM_SLEEP
percpu_alloc()
pserialize_create()
psref_class_create()

all of these paths include an assertion that the allocation has not failed,
so callers should not assert that again.
 1.74  20-Aug-2016  hannken Remove now obsolete operation vcache_remove().

Welcome to 7.99.36
 1.73  20-Apr-2015  riastradh Cull unused vnode v_iflags: VI_LAYER, VI_LOCKSHARE.
 1.72  20-Apr-2015  riastradh Make vget always return vnode unlocked.

Convert callers who want locks to use vn_lock afterward.

Add extra argument so the compiler will report stragglers.
 1.71  24-Feb-2015  hannken A union node may be reactivated while it is being reclaimed so
change union_freevp() to detach the vnode from the union node
by clearing the vnode backpointer and the lower node sizes.
 1.70  16-Feb-2015  hannken Change union to vcache. Use address of the union node as key.

It would be better to use (uppervp, lowervp) as key, but either
may be NULL and may change any time.
 1.69  16-Feb-2015  hannken Add reference count to union node.
 1.68  16-Feb-2015  hannken Remove a superfluous vref(), VOP_CREATE() was changed to
keep dvp referenced and locked some time ago.
 1.67  05-Sep-2014  matt branches: 1.67.2;
Try not to use f_data, use f_{vnode,socket,pipe,mqueue,kqueue,ksem} to get
a correctly typed pointer.
 1.66  17-Jun-2014  hannken branches: 1.66.2;
Unlock directory vnode after VOP_CREATE.
 1.65  17-May-2014  dholland Also set or assert that *vpp is null before calling VOP_MKDIR.
 1.64  17-May-2014  dholland Set *vpp to NULL before calling VOP_CREATE. This always happens when
calling using nameidata, and if not something went wrong, so we'd like
to be able to assert about it.
 1.63  16-Feb-2014  hannken branches: 1.63.2;
Change union_allocvp() to take an unlocked uppervp and to return the
union node unlocked. Another VI_XLOCK hack is gone.
 1.62  14-Feb-2014  hannken Member un_flags is unused now -- remove.
 1.61  13-Feb-2014  hannken Get rid of UN_KLOCK to keep a lock on vput(). It is not really needed
and makes the source difficult to read. Always hold references to the
union nodes until the operation is done.
 1.60  07-Feb-2014  hannken Change vnode operation lookup to return the resulting vnode *vpp unlocked.
Change cache_lookup() to return an unlocked vnode.

Discussed on tech-kern@

Welcome to 6.99.31
 1.59  23-Jan-2014  hannken Change vnode operations create, mknod, mkdir and symlink to return
the resulting vnode *vpp unlocked.

Discussed on tech-kern@

Welcome to 6.99.30
 1.58  17-Jan-2014  hannken Change vnode operations create, mknod, mkdir and symlink to keep the
directory node dvp locked on return.

Discussed on tech-kern@

Welcome to 6.99.29
 1.57  17-Oct-2013  christos remove unused code
 1.56  05-Nov-2012  dholland branches: 1.56.2;
Disentangle the namecache from the internals of namei.

- Move the namecache's hash computation to inside the namecache code,
instead of being spread out all over the place. Remove cn_hash from
struct componentname and delete all uses of it.

- It is no longer necessary (if it ever was) for cache_lookup and
cache_lookup_raw to clear MAKEENTRY from cnp->cn_flags for the cases
that cache_enter already checks for.

- Rearrange the interface of cache_lookup (and cache_lookup_raw) to
make it somewhat simpler, to exclude certain nonexistent error
conditions, and (most importantly) to make it not require write access
to cnp->cn_flags.

This change requires a kernel bump.
 1.55  25-Nov-2011  hannken branches: 1.55.8;
When union_allocvp() finds a node being cleaned out and the caller holds
a lock, ignore the node and continue. To allow the cleaning to succeed
the current threadmust make progress.
For a brief time the cache may contain more than one vnode referring to
a lower node.

Don't unlock the hash mutex if getnewvnode fails -- we don't hold it.
 1.54  23-Nov-2011  hannken Use hashinit() / hashdone() to create the union node hash list.

Cleanup the hash lookup in union_allocvp().

Needs more work as there is still a possible deadlock between
union_allocvp() and vclean().
 1.53  21-Nov-2011  hannken Replace flag based union node locking with generic vnode lock, support
shared and nowait locks and protect un_uppervp and un_*sz with mutex.

Mark file system MPSAFE.
 1.52  14-Nov-2011  hannken Remove a needless vnode lock/unlock dance. This is a leftover from the
removal of VOP_LEASE().

Function union_removed_upper() always works on unlocked upper vnodes so
remove the test-and-unlock and add an assertion.
 1.51  18-Oct-2011  hannken branches: 1.51.2;
VOP_GETATTR() needs a shared lock at least.
 1.50  23-Aug-2011  hannken Stop abusing relookup() to prepare the creation of new nodes
in the upper layer.
Replace union_relookup() with union_do_lookup() that prepares
a component, calls VOP_LOOKUP() and does the EEXIST test.
 1.49  13-Aug-2011  hannken Use mutexes to protect the hash lists instead of tsleep/wakeup.
 1.48  12-Aug-2011  hannken Change some `#ifdef DIAGNOSTIC' to `KASSERT'.
Instead of a `pid_t' use a `lwp_t *' for locking diagnostics.

No functional changes intended.
 1.47  12-Aug-2011  hannken When creating a union node representing a device initialize
the spec_node to make vrele() happy.
 1.46  10-Aug-2011  hannken Update the (shared) v_interlock if the upper node changes.
 1.45  10-Aug-2011  hannken Use LK_SHARED, it is sufficient for VOP_GETATTR() and VOP_READDIR().
 1.44  07-Aug-2011  hannken Change union rmdir semantics to fail directory removal for
non-empty directories like all other file systems do.

Change test accordingly.
 1.43  12-Jun-2011  rmind Welcome to 5.99.53! Merge rmind-uvmplock branch:

- Reorganize locking in UVM and provide extra serialisation for pmap(9).
New lock order: [vmpage-owner-lock] -> pmap-lock.

- Simplify locking in some pmap(9) modules by removing P->V locking.

- Use lock object on vmobjlock (and thus vnode_t::v_interlock) to share
the locks amongst UVM objects where necessary (tmpfs, layerfs, unionfs).

- Rewrite and optimise x86 TLB shootdown code, make it simpler and cleaner.
Add TLBSTATS option for x86 to collect statistics about TLB shootdowns.

- Unify /dev/mem et al in MI code and provide required locking (removes
kernel-lock on some ports). Also, avoid cache-aliasing issues.

Thanks to Andrew Doran and Joerg Sonnenberger, as their initial patches
formed the core changes of this branch.
 1.42  02-Jan-2011  dholland branches: 1.42.6;
Remove the special refcount behavior (adding an extra reference to the
parent dir) associated with SAVESTART in relookup().

Check all call sites to make sure that SAVESTART wasn't set while
calling relookup(); if it was, adjust the refcount behavior. Remove
related references to SAVESTART.

The only code that was reaching the extra ref was msdosfs_rename,
where the refcount behavior was already fairly broken and/or gross;
repair it.

Add a dummy 4th argument to relookup to make sure code that hasn't
been inspected won't compile. (This will go away next time the
relookup semantics change, which they will.)
 1.41  30-Nov-2010  dholland Abolish the SAVENAME and HASBUF flags. There is now always a buffer,
so the path in a struct componentname is now always valid during VOP
calls.
 1.40  30-Nov-2010  dholland Abolish struct componentname's cn_pnbuf. Use the path buffer in the
pathbuf object passed to namei as work space instead. (For now a pnbuf
pointer appears in struct nameidata, to support certain unclean things
that haven't been fixed yet, but it will be going away in the future.)

This removes the need for the SAVENAME and HASBUF namei flags.
 1.39  21-Jul-2010  hannken Make holding v_interlock mandatory for callers of vget().

Announced some time ago on tech-kern.
 1.38  16-Jul-2010  hannken Always take the hash list lock before removing a node from the hash chain.

Release the hash list lock before calling getnewvnode() and check the
hash list again like other file systems do.

Take v_interlock before calling vget().
 1.37  24-Jun-2010  hannken Clean up vnode lock operations pass 2:

VOP_UNLOCK(vp, flags) -> VOP_UNLOCK(vp): Remove the unneeded flags argument.

Welcome to 5.99.32.

Discussed on tech-kern.
 1.36  06-Jun-2010  hannken Change layered file systems to always pass the locking VOP's down to the
leaf file system. Remove now unused member v_vnlock from struct vnode.
Welcome to 5.99.30

Discussed on tech-kern.
 1.35  08-Jan-2010  pooka branches: 1.35.2; 1.35.4;
The VATTR_NULL/VREF/VHOLD/HOLDRELE() macros lost their will to live
years ago when the kernel was modified to not alter ABI based on
DIAGNOSTIC, and now just call the respective function interfaces
(in lowercase). Plenty of mix'n match upper/lowercase has creeped
into the tree since then. Nuke the macros and convert all callsites
to lowercase.

no functional change
 1.34  17-Dec-2008  cegger kill MALLOC and FREE macros.
 1.33  21-Mar-2008  ad branches: 1.33.4; 1.33.12;
Catch up with descriptor handling changes. See kern_descrip.c revision
1.173 for details.
 1.32  27-Feb-2008  matt Convert to ansi definitions from old-style definitons.
 1.31  25-Jan-2008  ad branches: 1.31.2; 1.31.6;
Remove VOP_LEASE. Discussed on tech-kern.
 1.30  08-Dec-2007  pooka Remove cn_lwp from struct componentname. curlwp should be used
from on. The NDINIT() macro no longer takes the lwp parameter and
associates the credentials of the calling thread with the namei
structure.
 1.29  26-Nov-2007  pooka branches: 1.29.2;
Remove the "struct lwp *" argument from all VFS and VOP interfaces.
The general trend is to remove it from all kernel interfaces and
this is a start. In case the calling lwp is desired, curlwp should
be used.

quick consensus on tech-kern
 1.28  10-Oct-2007  ad branches: 1.28.4;
Merge from vmlocking:

- Split vnode::v_flag into three fields, depending on field locking.
- simple_lock -> kmutex in a few places.
- Fix some simple locking problems.
 1.27  23-Jul-2007  pooka branches: 1.27.4; 1.27.6; 1.27.8; 1.27.10;
Rearrange previous to make it work by other than chance.

noticed by xtraeme's gcc flags
 1.26  23-Jul-2007  pooka Set union vnode size when creating a vnode.

fixes kern/36679 by Geoff C. Wing
 1.25  07-Apr-2007  hannken branches: 1.25.4;
Remove calls to now obsolete vn_start_write() and vn_finished_write().
 1.24  04-Feb-2007  chs branches: 1.24.2; 1.24.6; 1.24.8;
more fixes for the new vnode locking scheme:
- don't use SAVESTART in calls to relookup() from unionfs,
just vref() the desired vnode when we need to.
- fix locking and refcounting in the unionfs EEXIST error cases.
- release any vnode locks before calling VFS_ROOT(), vfs_busy() is enough.
this allows us to simplify union_root() and fix PR 3006.
- union_lock() doesn't handle shared lock requests correctly,
so convert them to exclusive instead. fixes PR 34775.
- in relookup(), avoid reusing "dp" for different purposes,
the error handling wasn't right. (actually just get rid of dp.)
also, change relookup() to ignore LOCKLEAF and always return the
vnode locked since the callers already expect this.
 1.23  29-Jan-2007  hubertf Remove more duplicate headers.
Patch by Slava Semushin <slava.semushin@gmail.com>

Again, this was tested by comparing obj files from a pristine and a patched
source tree against an i386/ALL kernel, and also for src/sbin/fsck_ffs,
src/sbin/fsdb and src/usr.sbin/makefs. Only changes in assert() line numbers
were detected in 'objdump -d' output.
 1.22  09-Dec-2006  chs a smorgasbord of improvements to vnode locking and path lookup:
- LOCKPARENT is no longer relevant for lookup(), relookup() or VOP_LOOKUP().
these now always return the parent vnode locked. namei() works as before.
lookup() and various other paths no longer acquire vnode locks in the
wrong order via vrele(). fixes PR 32535.
as a nice side effect, path lookup is also up to 25% faster.
- the above allows us to get rid of PDIRUNLOCK.
- also get rid of WANTPARENT (just use LOCKPARENT and unlock it).
- remove an assumption in layer_node_find() that all file systems implement
a recursive VOP_LOCK() (unionfs doesn't).
- require that all file systems supply vfs_vptofh and vfs_fhtovp routines.
fill in eopnotsupp() for file systems that don't support being exported
and remove the checks for NULL. (layerfs calls these without checking.)
- in union_lookup1(), don't change refcounts in the ISDOTDOT case, just
adjust which vnode is locked. fixes PR 33374.
- apply fixes for ufs_rename() from ufs_vnops.c rev. 1.61 to ext2fs_rename().
 1.21  16-Nov-2006  christos branches: 1.21.2;
__unused removal on arguments; approved by core.
 1.20  12-Oct-2006  christos - sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386
 1.19  23-Jul-2006  ad branches: 1.19.4; 1.19.6;
Use the LWP cached credentials where sane.
 1.18  14-May-2006  elad integrate kauth.
 1.17  15-Apr-2006  christos Coverity CID 1001: Avoid NULL deref.
 1.16  01-Mar-2006  yamt branches: 1.16.2; 1.16.4; 1.16.6;
merge yamt-uio_vmspace branch.

- use vmspace rather than proc or lwp where appropriate.
the latter is more natural to specify an address space.
(and less likely to be abused for random purposes.)
- fix a swdmover race.
 1.15  11-Dec-2005  christos branches: 1.15.2; 1.15.4; 1.15.6;
merge ktrace-lwp.
 1.14  30-Aug-2005  xtraeme branches: 1.14.6;
Remove __P()
 1.13  29-May-2005  christos branches: 1.13.2;
- rename variables to avoid shadowing.
- add a few const.
 1.12  26-Feb-2005  perry nuke trailing whitespace
 1.11  17-Sep-2004  skrll branches: 1.11.4; 1.11.6;
There's no need to pass a proc value when using UIO_SYSSPACE with
vn_rdwr(9) and uiomove(9).

OK'd by Jason Thorpe
 1.10  12-May-2004  jrf caddr_t -> void * and removal of some more casts.
 1.9  27-Apr-2004  jrf First pass for some caddr_t removal and changes to get rid of it where we
no longer use and/or need it

- removed casts from unionfs, deadfs and fdesc
(there are more to hunt down still)
- changed vfs_quotactl args argumet from caddr_t to void *
- changed vfs_quotactl structures/callers to reflect the api change

Compiled fine and ran for about a day. Approved/reviewed by
christos@netbsd.org and gimpy@netbsd.org.
 1.8  15-Oct-2003  hannken Add the gating of system calls that cause modifications to the underlying
file system.
The function vfs_write_suspend stops all new write operations to a file
system, allows any file system modifying system calls already in progress
to complete, then sync's the file system to disk and returns. The
function vfs_write_resume allows the suspended write operations to
complete.

From FreeBSD with slight modifications.

Approved by: Frank van der Linden <fvdl@netbsd.org>
 1.7  07-Aug-2003  agc Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.
 1.6  29-Jun-2003  fvdl branches: 1.6.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.
 1.5  29-Jun-2003  thorpej Undo part of the ktrace/lwp changes. In particular:
* Remove the "lwp *" argument that was added to vget(). Turns out
that nothing actually used it!
* Remove the "lwp *" arguments that were added to VFS_ROOT(), VFS_VGET(),
and VFS_FHTOVP(); all they did was pass it to vget() (which, as noted
above, didn't use it).
* Remove all of the "lwp *" arguments to internal functions that were added
just to appease the above.
 1.4  29-Jun-2003  thorpej Fix problems with Darren's ktrace/lwp changes.
 1.3  29-Jun-2003  darrenr More changes for providing lwpid for ktrace (sparc GENERIC built)
 1.2  17-Mar-2003  jdolecek make it possible for UNION fs to be loaded via LKM - instead of
having some #ifdef UNION code in vfs_vnops.c, introduce variable
'vn_union_readdir_hook' which is set to address of appropriate
vn_readdir() hook by union filesystem when it's loaded & mounted
 1.1  16-Mar-2003  jdolecek move union filesystem code from sys/miscfs/union to sys/fs/union
 1.6.2.7  10-Nov-2005  skrll Sync with HEAD. Here we go again...
 1.6.2.6  04-Mar-2005  skrll Sync with HEAD.

Hi Perry!
 1.6.2.5  21-Sep-2004  skrll Fix the sync with head I botched.
 1.6.2.4  18-Sep-2004  skrll Sync with HEAD.
 1.6.2.3  24-Aug-2004  skrll Undo part of the ktrace/lwp changes. In particular:
* Remove the "lwp *" argument that was added to vget(). Turns out
that nothing actually used it!
* Remove the "lwp *" arguments that were added to VFS_ROOT(), VFS_VGET(),
and VFS_FHTOVP(); all they did was pass it to vget() (which, as noted
above, didn't use it).
* Remove all of the "lwp *" arguments to internal functions that were added
just to appease the above.
 1.6.2.2  03-Aug-2004  skrll Sync with HEAD
 1.6.2.1  03-Jul-2003  wrstuden LWP-ify union fs.

Note: These changes suffer from the same cnp->cn_lwp issue noted for
ufs. They will need to get fixed at the same time as ufs. The fix is to
add struct lwp * as a parameter to some VOPs.

Note also that most of the cn_lwp references used to be cn_proc references,
so if cnp->cn_lwp is bad to use, unionfs's been naughty for quite some
time.
 1.11.6.1  19-Mar-2005  yamt sync with head. xen and whitespace. xen part is not finished.
 1.11.4.1  29-Apr-2005  kent sync with -current
 1.13.2.10  24-Mar-2008  yamt sync with head.
 1.13.2.9  17-Mar-2008  yamt sync with head.
 1.13.2.8  04-Feb-2008  yamt sync with head.
 1.13.2.7  21-Jan-2008  yamt sync with head
 1.13.2.6  07-Dec-2007  yamt sync with head
 1.13.2.5  27-Oct-2007  yamt sync with head.
 1.13.2.4  03-Sep-2007  yamt sync with head.
 1.13.2.3  26-Feb-2007  yamt sync with head.
 1.13.2.2  30-Dec-2006  yamt sync with head.
 1.13.2.1  21-Jun-2006  yamt sync with head.
 1.14.6.2  19-Nov-2005  yamt - finish reverting VOP_READ prototype changes.
- remove unused variables.
- fix typos.
some of them are pointed by Juan RP.
 1.14.6.1  15-Nov-2005  yamt - adapt to the new prototype of VOP_READ.
- adapt ext2fs and union.
 1.15.6.2  01-Jun-2006  kardel Sync with head.
 1.15.6.1  22-Apr-2006  simonb Sync with head.
 1.15.4.1  09-Sep-2006  rpaulo sync with head
 1.15.2.1  18-Feb-2006  yamt adapt the rest of MI code.
 1.16.6.1  24-May-2006  tron Merge 2006-05-24 NetBSD-current into the "peter-altq" branch.
 1.16.4.3  06-May-2006  christos - Move kauth_cred_t declaration to <sys/types.h>
- Cleanup struct ucred; forward declarations that are unused.
- Don't include <sys/kauth.h> in any header, but include it in the c files
that need it.

Approved by core.
 1.16.4.2  19-Apr-2006  elad sync with head.
 1.16.4.1  08-Mar-2006  elad Adapt to kernel authorization KPI.
 1.16.2.2  11-Aug-2006  yamt sync with head
 1.16.2.1  24-May-2006  yamt sync with head.
 1.19.6.2  10-Dec-2006  yamt sync with head.
 1.19.6.1  22-Oct-2006  yamt sync with head
 1.19.4.4  09-Feb-2007  ad Sync with HEAD.
 1.19.4.3  01-Feb-2007  ad Sync with head.
 1.19.4.2  12-Jan-2007  ad Sync with head.
 1.19.4.1  18-Nov-2006  ad Sync with head.
 1.21.2.1  17-Feb-2007  tron Apply patch (requested by chs in ticket #422):
- Fix various deadlock problems with nullfs and unionfs.
- Speed up path lookups by upto 25%.
 1.24.8.1  11-Jul-2007  mjf Sync with head.
 1.24.6.3  20-Aug-2007  ad Sync with HEAD.
 1.24.6.2  17-Jun-2007  ad - Increase the number of thread priorities from 128 to 256. How the space
is set up is to be revisited.
- Implement soft interrupts as kernel threads. A generic implementation
is provided, with hooks for fast-path MD code that can run the interrupt
threads over the top of other threads executing in the kernel.
- Split vnode::v_flag into three fields, depending on how the flag is
locked (by the interlock, by the vnode lock, by the file system).
- Miscellaneous locking fixes and improvements.
 1.24.6.1  10-Apr-2007  ad Sync with head.
 1.24.2.1  15-Apr-2007  yamt sync with head.
 1.25.4.1  15-Aug-2007  skrll Sync with HEAD.
 1.27.10.2  23-Jul-2007  pooka Rearrange previous to make it work by other than chance.

noticed by xtraeme's gcc flags
 1.27.10.1  23-Jul-2007  pooka file union_subr.c was added on branch matt-mips64 on 2007-07-23 08:52:48 +0000
 1.27.8.1  14-Oct-2007  yamt sync with head.
 1.27.6.3  23-Mar-2008  matt sync with HEAD
 1.27.6.2  09-Jan-2008  matt sync with HEAD
 1.27.6.1  06-Nov-2007  matt sync with HEAD
 1.27.4.3  09-Dec-2007  jmcneill Sync with HEAD.
 1.27.4.2  27-Nov-2007  joerg Sync with HEAD. amd64 Xen support needs testing.
 1.27.4.1  26-Oct-2007  joerg Sync with HEAD.

Follow the merge of pmap.c on i386 and amd64 and move
pmap_init_tmp_pgtbl into arch/x86/x86/pmap.c. Modify the ACPI wakeup
code to restore CR4 before jumping back into kernel space as the large
page option might cover that.
 1.28.4.3  18-Feb-2008  mjf Sync with HEAD.
 1.28.4.2  27-Dec-2007  mjf Sync with HEAD.
 1.28.4.1  08-Dec-2007  mjf Sync with HEAD.
 1.29.2.1  26-Dec-2007  ad Sync with head.
 1.31.6.2  17-Jan-2009  mjf Sync with HEAD.
 1.31.6.1  03-Apr-2008  mjf Sync with HEAD.
 1.31.2.1  24-Mar-2008  keiichi sync with head.
 1.33.12.1  19-Jan-2009  skrll Sync with HEAD.
 1.33.4.3  11-Aug-2010  yamt sync with head.
 1.33.4.2  11-Mar-2010  yamt sync with head
 1.33.4.1  04-May-2009  yamt sync with head.
 1.35.4.5  30-May-2011  rmind - Amend getnewvnode(9) to take the lock for sharing, not a vnode.
- Update tmpfs to perform vnode and UVM object lock sharing correctly.
 1.35.4.4  21-May-2011  rmind Finish v_interlock sharing bits for union/unionfs.
 1.35.4.3  19-May-2011  rmind Implement sharing of vnode_t::v_interlock amongst vnodes:
- Lock is shared amongst UVM objects using uvm_obj_setlock() or getnewvnode().
- Adjust vnode cache to handle unsharing, add VI_LOCKSHARE flag for that.
- Use sharing in tmpfs and layerfs for underlying object.
- Simplify locking in ubc_fault().
- Sprinkle some asserts.

Discussed with ad@.
 1.35.4.2  05-Mar-2011  rmind sync with head
 1.35.4.1  03-Jul-2010  rmind sync with head
 1.35.2.1  17-Aug-2010  uebayasi Sync with HEAD.
 1.42.6.1  23-Jun-2011  cherry Catchup with rmind-uvmplock merge.
 1.51.2.3  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")
 1.51.2.2  16-Jan-2013  yamt sync with (a bit old) head
 1.51.2.1  17-Apr-2012  yamt sync with head
 1.55.8.3  03-Dec-2017  jdolecek update from HEAD
 1.55.8.2  20-Aug-2014  tls Rebase to HEAD as of a few days ago.
 1.55.8.1  20-Nov-2012  tls Resync to 2012-11-19 00:00:00 UTC
 1.56.2.1  18-May-2014  rmind sync with head
 1.63.2.1  10-Aug-2014  tls Rebase.
 1.66.2.1  17-Feb-2015  martin Pull up following revision(s) (requested by hannken in ticket #529):
sys/fs/union/union_subr.c: revision 1.68
Remove a superfluous vref(), VOP_CREATE() was changed to
keep dvp referenced and locked some time ago.
 1.67.2.4  28-Aug-2017  skrll Sync with HEAD
 1.67.2.3  05-Oct-2016  skrll Sync with HEAD
 1.67.2.2  06-Jun-2015  skrll Sync with HEAD
 1.67.2.1  06-Apr-2015  skrll Sync with HEAD
 1.75.2.1  25-Jul-2017  snj Pull up following revision(s) (requested by hannken in ticket #145):
sys/fs/union/union.h: revision 1.29
sys/fs/union/union_subr.c: revision 1.76
Make union_newlower() ans union_newupper() local to union_subr.c,
expand and remove union_updatevp() and take care to transfer the
vnode lock from the union vnode to its new upper vnode without
breaking the fstrans state.
Add assertions that un_lowervp and un_uppervp never change from
non-NULL to non-NULL.
 1.76.2.2  17-Jul-2017  hannken 3095096
 1.76.2.1  17-Jul-2017  hannken file union_subr.c was added on branch perseant-stdc-iso10646 on 2017-07-17 09:22:37 +0000
 1.77.10.1  29-Feb-2020  ad Sync with head.
 1.77.8.1  27-Aug-2020  martin Pull up following revision(s) (requested by hannken in ticket #1062):

sys/fs/union/union.h: revision 1.30
sys/fs/union/union_subr.c: revision 1.79
sys/fs/union/union_vnops.c: revision 1.74

Operation union_readdirhook() stores the lower directory as un_uppervp.
This breaks the assumption that un_uppervp->v_mount is the upper mount.

Fix by storing the directory as un_lowervp and adapt union_readdir().

Should fix PR kern/55552: panic with union mount
 1.77.4.1  08-Apr-2020  martin Merge changes from current as of 20200406

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