• Chuck Lever's avatar
    [PATCH] NFS: Introduce the use of inode->i_lock to protect fields in nfsi · dc59250c
    Chuck Lever authored
    Down the road we want to eliminate the use of the global kernel lock entirely
    from the NFS client.  To do this, we need to protect the fields in the
    nfs_inode structure adequately.  Start by serializing updates to the
    "cache_validity" field.
    
    Note this change addresses an SMP hang found by njw@osdl.org, where processes
    deadlock because nfs_end_data_update and nfs_revalidate_mapping update the
    "cache_validity" field without proper serialization.
    
    Test plan:
     Millions of fsx ops on SMP clients.  Run Nick Wilson's breaknfs program on
     large SMP clients.
    Signed-off-by: default avatarChuck Lever <cel@netapp.com>
    Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    dc59250c
dir.c 43.9 KB