Module Name:	src
Committed By:	chs
Date:		Sun Feb  4 15:03:20 UTC 2007

Modified Files:
	src/sys/fs/union: union_subr.c union_vfsops.c union_vnops.c
	src/sys/kern: vfs_lookup.c vfs_syscalls.c
	src/sys/nfs: nfs_export.c

Log Message:
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.


To generate a diff of this commit:
cvs rdiff -r1.23 -r1.24 src/sys/fs/union/union_subr.c
cvs rdiff -r1.42 -r1.43 src/sys/fs/union/union_vfsops.c
cvs rdiff -r1.18 -r1.19 src/sys/fs/union/union_vnops.c
cvs rdiff -r1.80 -r1.81 src/sys/kern/vfs_lookup.c
cvs rdiff -r1.297 -r1.298 src/sys/kern/vfs_syscalls.c
cvs rdiff -r1.24 -r1.25 src/sys/nfs/nfs_export.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.