src/sys/fs/nullfs/null_vnops.c, branch release/5.3.0_cvs

This commit was manufactured by cvs2svn to create tag

2004-11-04T19:12:42+00:00

'RELENG_5_3_0_RELEASE'.

This commit was manufactured to restore the state of the 5.3-RELEASE image.

Remove advertising clause from University of California Regent's

2004-04-07T20:46:16+00:00

license, per letter dated July 22, 1999 and email from Peter Wemm,
Alan Cox and Robert Watson.

Approved by: core, peter, alc, rwatson

Don't try to unlock the directory vnode in null_lookup() if the lock is

2004-01-11T23:44:32+00:00

shared with the underlying file system and the lookup in the underlying
file system did the unlock for us.

v_vxproc was a bogus name for a thread (pointer).

2003-12-28T09:12:56+00:00

MFp4: Fix two bugs causing possible deadlocks or panics, and one nit:

2003-06-17T08:52:45+00:00

- Emulate lock draining (LK_DRAIN) in null_lock() to avoid deadlocks
  when the vnode is being recycled.
- Don't allow null_nodeget() to return a nullfs vnode from the wrong
  mount when multiple nullfs's are mounted. It's unclear why these checks
  were removed in null_subr.c 1.35, but they are definitely necessary.
  Without the checks, trying to unmount a nullfs mount will erroneously
  return EBUSY, and forcibly unmounting with -f will cause a panic.
- Bump LOG2_SIZEVNODE up to 8, since vnodes are >256 bytes now. The old
  value (7) didn't cause any problems, but made the hash algorithm
  suboptimal.

These changes fix nullfs enough that a parallel buildworld succeeds.

Submitted by:	tegge (partially; LK_DRAIN)
Tested by:	kris

Finish cleanup of vprint() which was begun with changing v_tag to a string.

2003-03-03T19:15:40+00:00

Remove extraneous uses of vop_null, instead defering to the default op.
Rename vnode type "vfs" to the more descriptive "syncer".
Fix formatting for various filesystems that use vop_print.

Fix typos, mostly s/ an / a / where appropriate and a few s/an/and/

2002-12-30T21:18:15+00:00

Add FreeBSD Id tag where missing.

Be consistent about functions being static.

2002-10-16T08:00:32+00:00

Spotted by:	FlexeLint

Regularize the vop_stdlock'ing protocol across all the filesystems

2002-10-14T03:20:36+00:00

that use it. Specifically, vop_stdlock uses the lock pointed to by
vp->v_vnlock. By default, getnewvnode sets up vp->v_vnlock to
reference vp->v_lock. Filesystems that wish to use the default
do not need to allocate a lock at the front of their node structure
(as some still did) or do a lockinit. They can simply start using
vn_lock/VOP_UNLOCK. Filesystems that wish to manage their own locks,
but still use the vop_stdlock functions (such as nullfs) can simply
replace vp->v_vnlock with a pointer to the lock that they wish to
have used for the vnode. Such filesystems are responsible for
setting the vp->v_vnlock back to the default in their vop_reclaim
routine (e.g., vp->v_vnlock = &vp->v_lock).

In theory, this set of changes cleans up the existing filesystem
lock interface and should have no function change to the existing
locking scheme.

Sponsored by:	DARPA & NAI Labs.

Remove all use of vnode->v_tag, replacing with appropriate substitutes.

2002-09-14T09:02:28+00:00

v_tag is now const char * and should only be used for debugging.

Additionally:
1. All users of VT_NTS now check vfsconf->vf_type VFCF_NETWORK
2. The user of VT_PROCFS now checks for the new flag VV_PROCDEP, which
is propagated by pseudofs to all child vnodes if the fs sets PFS_PROCDEP.

Suggested by:   phk
Reviewed by:    bde, rwatson (earlier version)