• Al Viro's avatar
    new ->follow_link() and ->put_link() calling conventions · 680baacb
    Al Viro authored
    a) instead of storing the symlink body (via nd_set_link()) and returning
    an opaque pointer later passed to ->put_link(), ->follow_link() _stores_
    that opaque pointer (into void * passed by address by caller) and returns
    the symlink body.  Returning ERR_PTR() on error, NULL on jump (procfs magic
    symlinks) and pointer to symlink body for normal symlinks.  Stored pointer
    is ignored in all cases except the last one.
    
    Storing NULL for opaque pointer (or not storing it at all) means no call
    of ->put_link().
    
    b) the body used to be passed to ->put_link() implicitly (via nameidata).
    Now only the opaque pointer is.  In the cases when we used the symlink body
    to free stuff, ->follow_link() now should store it as opaque pointer in addition
    to returning it.
    Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
    680baacb
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