• David Howells's avatar
    FS-Cache: Add interface to check consistency of a cached object · da9803bc
    David Howells authored
    Extend the fscache netfs API so that the netfs can ask as to whether a cache
    object is up to date with respect to its corresponding netfs object:
    
    	int fscache_check_consistency(struct fscache_cookie *cookie)
    
    This will call back to the netfs to check whether the auxiliary data associated
    with a cookie is correct.  It returns 0 if it is and -ESTALE if it isn't; it
    may also return -ENOMEM and -ERESTARTSYS.
    
    The backends now have to implement a mandatory operation pointer:
    
    	int (*check_consistency)(struct fscache_object *object)
    
    that corresponds to the above API call.  FS-Cache takes care of pinning the
    object and the cookie in memory and managing this call with respect to the
    object state.
    
    Original-author: Hongyi Jia <jiayisuse@gmail.com>
    Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
    cc: Hongyi Jia <jiayisuse@gmail.com>
    cc: Milosz Tanski <milosz@adfin.com>
    da9803bc
netfs-api.txt 30.4 KB