CVS log for src/sys/sys/fstrans.h

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Add operation fstrans_held(struct mount *), true if the current thread
holds a fstrans lock.

Ride 9.99.61

Sync with HEAD

Move pointer to fstrans private data into "struct lwp".

Ride NetBSD 8.99.35

Sync with head

Pull up following revision(s) (requested by hannken in ticket #1052):

	sys/kern/vfs_trans.c: revision 1.51
	distrib/sets/lists/comp/mi: revision 1.2233
	share/man/man9/fstrans.9: revision 1.27
	share/man/man9/Makefile: revision 1.431
	sys/sys/fstrans.h: revision 1.12
	sys/rump/librump/rumpkern/emul.c: revision 1.187
	sys/dev/vnd.c: revision 1.266
	sys/miscfs/genfs/genfs_vfsops.c: revision 1.8

Bring back three state file system suspension:

 NORMAL -> SUSPENDING -> SUSPENDED

and add operation fstrans_start_lazy() that only blocks while SUSPENDED.

Change vndthread() support operation handle_with_rdwr() to bracket
its file system operations by fstrans_start_lazy() and fstrans_done().

PR kern/53624 (dom0 freeze on domU exit)

Bring back three state file system suspension:

  NORMAL -> SUSPENDING -> SUSPENDED

and add operation fstrans_start_lazy() that only blocks while SUSPENDED.

Change vndthread() support operation handle_with_rdwr() to bracket
its file system operations by fstrans_start_lazy() and fstrans_done().

PR kern/53624 (dom0 freeze on domU exit)

update from HEAD

Sync with HEAD

pullup the following revisions, requested by hannken in ticket #2:
	src/share/man/man9/fstrans.9			1.25
	src/sys/kern/vfs_mount.c			1.66
	src/sys/kern/vfs_subr.c				1.468
	src/sys/kern/vfs_trans.c			1.46
	src/sys/kern/vfs_vnode.c			1.94, 1.95, 1.96
	src/sys/kern/vnode_if.c				1.105, 1.106
	src/sys/kern/vnode_if.sh			1.65, 1.66
	src/sys/kern/vnode_if.src			1.76
	src/sys/miscfs/genfs/genfs_io.c			1.69
	src/sys/miscfs/genfs/genfs_vnops.c		1.196, 1.197
	src/sys/miscfs/genfs/layer_extern.h		1.40
	src/sys/miscfs/genfs/layer_vfsops.c		1.51
	src/sys/miscfs/genfs/layer_vnops.c		1.67
	src/sys/miscfs/nullfs/null_vnops.c		1.42
	src/sys/miscfs/overlay/overlay_vnops.c		1.24
	src/sys/miscfs/umapfs/umap_vnops.c		1.60
	src/sys/rump/include/rump/rumpvnode_if.h	1.29, 1.30
	src/sys/rump/librump/rumpkern/emul.c		1.182
	src/sys/rump/librump/rumpvfs/rumpvnode_if.c	1.29, 1.30
	src/sys/sys/fstrans.h				1.11
	src/sys/sys/vnode.h				1.278
	src/sys/sys/vnode_if.h				1.100, 1.101
	src/sys/sys/vnode_impl.h			1.14, 1.15
	src/sys/ufs/lfs/lfs_pages.c			1.12

Vnode state, lock and fstrans cleanup:
- Rename vnode state "VS_ACTIVE" to "VS_LOADED" and add synthetic
  state "VS_ACTIVE" to assert a loaded vnode with usecount > 0.

- Redo FSTRANS in vnode_if.c and use it for VOP_LOCK and VOP_UNLOCK.

- Cleanup the genfs lock operations.

- Make "struct vnode_impl" member "vi_lock" a krwlock_t again.

- Remove the lock type argument from fstrans_start and
  fstrans_start_nowait,
  remove now unused FSTRANS state "FSTRANS_SUSPENDING".

Operations fstrans_start() and fstrans_start_nowait() now always
use FSTRANS_SHARED as lock type so remove the lock type argument.

File system state FSTRANS_SUSPENDING is now unused so remove it.

Regen vnode_if files.

Ride 8.99.1 less than a hour ago.

sync with head.

Sync with HEAD.

Sync with HEAD.

Update haad-dm branch to haad-dm-base2.

Don't use do {} while(0) for a single function call.

Sync with HEAD.

sync with head.

sync with head.

Remove clause 3 and 4 from TNF licenses

Sync with HEAD.

sync with head

sync with HEAD

Sync with HEAD

Merge vmlocking2 to head.

Sync with HEAD.

sync with head

Pull the vmlocking changes into a new branch.

Sync with HEAD.

Fscow_run(): add a flag "bool data_valid" to note still valid data.
Buffers run through copy-on-write are marked B_COWDONE.  This condition
is valid until the buffer has run through bwrite() and gets cleared from
biodone().

Welcome to 4.99.39.

Reviewed by: YAMAMOTO Takashi <yamt@netbsd.org>

Add fstrans_mount() to explicitly allocate fstrans_info.
Replace remaining malloc() to kmem_alloc() in vfs_trans.c.

Ok: Andrew Doran <ad@netbsd.org>

sync with HEAD

sync with head.

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.

sync with head.

Sync with head.

Add prototype for fstrans_unmount().

Update the file system copy-on-write handler.

- Instead of hooking the handler on the specdev of a mounted file system
  hook directly on the `struct mount'.

- Rename from `vn_cow_*' to `fscow_*' and move to `kern/vfs_trans.c'.  Use
  `mount_*specific' instead of clobbering `struct mount' or `struct specinfo'.

- Replace the hand-made reader/writer lock with a krwlock.

- Keep `vn_cow_*' functions and mark as obsolete.

- Welcome to NetBSD 4.99.32 - `struct specinfo' changed size.

Reviewed by: Jason Thorpe <thorpej@netbsd.org>

sync with head.

Sync with head.

Sync with head.

sync with head.

Remove an assertion that causes non-diagnostic kernels to fail.

Fstrans_start() always returns zero, so change its type to void.

sync with head.

Sync with head.

file fstrans.h was added on branch yamt-lazymbuf on 2007-02-26 09:12:11 +0000

file fstrans.h was added on branch newlock2 on 2007-02-01 08:48:47 +0000

Change fstrans enum types to upper case.
No functional change.

From Antti Kantee <pooka@netbsd.org>

include sys/mount.h

New file system suspension API to replace vn_start_write and vn_finished_write.
The suspension helpers are now put into file system specific operations.
This means every file system not supporting these helpers cannot be suspended
and therefore snapshots are no longer possible.

Implemented for file systems of type ffs.

The new API is enabled on a kernel option NEWVNGATE.  This option is
not enabled by default in any kernel config.

Presented and discussed on tech-kern with much input from
Bill Studenmund <wrstuden@netbsd.org> and YAMAMOTO Takashi <yamt@netbsd.org>.

Welcome to 4.99.9 (new vfs op vfs_suspendctl).