cvs commit: src/sys/kern vfs_lookup.c src/sys/nfs4client nfs4_vfsops.c nfs4_vnops.c src/sys/nfsclient nfs_node.c nfs_subs.c nfs_vfsops.c nfs_vnops.c nfsnode.h src/sys/sys mount.h

[Mohan Srinivasan]

mohans      2007-02-11 03:07:46 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_6)
    sys/kern             vfs_lookup.c 
    sys/nfs4client       nfs4_vfsops.c nfs4_vnops.c 
    sys/nfsclient        nfs_node.c nfs_subs.c nfs_vfsops.c 
                         nfs_vnops.c nfsnode.h 
    sys/sys              mount.h 
  Log:
  MFC:
  
  Fixes up the handling of shared vnode lock lookups in the NFS client,
  adds a FS type specific flag indicating that the FS supports shared
  vnode lock lookups, adds some logic in vfs_lookup.c to test this flag
  and set lock flags appropriately.
  
  This change fixes the general problem of cascading vnode locks when an
  NFS server goes down.
  
  Ideally, we wouldn't need these changes, as enabling shared vnode lock
  lookups globally would work. Unfortunately, UFS, for example isn't
  ready for shared vnode lock lookups, crashing pretty quickly.
  
  This change is the result of discussions with Stephan Uphoff (ups@).
  Thanks to Kris for shaking out several bugs in NFS with shared vnode
  lock lookups in current. MFC'ed per Kris' request.
  
  Reviewed by:    ups@
  
  Revision    Changes    Path
  1.80.2.11   +23 -6     src/sys/kern/vfs_lookup.c
  1.20.2.5    +2 -2      src/sys/nfs4client/nfs4_vfsops.c
  1.31.2.3    +6 -6      src/sys/nfs4client/nfs4_vnops.c
  1.76.2.5    +3 -3      src/sys/nfsclient/nfs_node.c
  1.140.2.2   +1 -1      src/sys/nfsclient/nfs_subs.c
  1.177.2.5   +10 -3     src/sys/nfsclient/nfs_vfsops.c
  1.258.2.11  +5 -5      src/sys/nfsclient/nfs_vnops.c
  1.55.2.1    +1 -1      src/sys/nfsclient/nfsnode.h
  1.197.2.9   +1 -0      src/sys/sys/mount.h