added check in handle_open() to avoid calling CREATE/OPEN when we're creating a symlink:
if (args->disposition == FILE_CREATE &&
args->access_mask == (FILE_WRITE_ATTRIBUTES | SYNCHRONIZE | DELETE) &&
args->access_mode == 0 &&
args->create_opts & FILE_OPEN_REPARSE_POINT)
these are the open arguments we get from the CreateSymbolicLink() syscall. by avoiding the call to CREATE/OPEN on handle_open(), we save ourselves from having to REMOVE the file before creating the symlink
added a check to handle_symlink() in case the file was actually created on open (an application could open the file with different arguments, and send the FSCTL_SET_REPARSE_POINT manually), and removes the file first
Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
driver handles FSCTL_SET_REPARSE_POINT by sending a symlink set upcall
daemon handles symlink set upcall by calling nfs41_create()
Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
no longer depends on nfs41_open_state or open_upcall_args
renamed to nfs41_symlink_follow() and added prototype to nfs41_ops.h
Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
