windows differentiates between directory and file symlinks because a file can have both FILE_ATTRIBUTE_DIRECTORY and FILE_ATTRIBUTE_REPARSE_POINT flags. nfs can only be one of NF4REG/DIR/LNK, so we have to do a readlink and look up the target file for symlinks to know whether or not to set the directory attribute flag. this is done recursively when we encounter links to links
Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
getattr upcall for FileAttributeTagInformation sets ReparseTag=IO_REPARSE_TAG_SYMLINK
readdir upcall sets EaSize=IO_REPARSE_TAG_SYMLINK; this makes the 'dir' command show files as <SYMLINK>, and causes a FSCTL_GET_REPARSE_POINT to query the symlink target
Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
because we no longer have to convert strings from unicode, we can avoid copying them out of the upcall buffer
Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
when open parsing fails, we were still returning upcall.status==NO_ERROR, so the driver assumed the open succeeded. other operations then sent up an open_state==NULL, and crashed the daemon. when upcall_parse() returns an error, set upcall.status to notify the driver
upcall_parse() prints a 'parsing of upcall <name> failed with <error>.' message on failure, so i removed redundant messages from the individual upcall parsing functions
Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
if readdir fails to look up a referred entry, set its type to NF4DIR so windows explorer shows it as a directory. when you double-click on the directory, it gives a message saying that it "refers to a location that is unavailable"
Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
