• M. Mohan Kumar's avatar
    9p: Implement TGETLOCK · 1d769cd1
    M. Mohan Kumar authored
        size[4] TGetlock tag[2] fid[4] getlock[n]
        size[4] RGetlock tag[2] getlock[n]
    TGetlock is used to test for the existence of byte range posix locks on a file
    identified by given fid. The reply contains getlock structure. If the lock could
    be placed it returns F_UNLCK in type field of getlock structure.  Otherwise it
    returns the details of the conflicting locks in the getlock structure
        getlock structure:
          type[1] - Type of lock: F_RDLCK, F_WRLCK
          start[8] - Starting offset for lock
          length[8] - Number of bytes to check for the lock
                 If length is 0, check for lock in all bytes starting at the location
                'start' through to the end of file
          pid[4] - PID of the process that wants to take lock/owns the task
                   in case of reply
          client[4] - Client id of the system that owns the process which
                      has the conflicting lock
    Signed-off-by: default avatarM. Mohan Kumar <mohan@in.ibm.com>
    Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
    Signed-off-by: default avatarVenkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
    Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
vfs_file.c 12.7 KB