CIFS: Implement follow_link for nounix CIFS mounts
by using a query reparse ioctl request.
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 6094397..8fe19c9 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -881,6 +881,37 @@
(__u8)type, wait, 0);
}
+static int
+cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
+ const char *full_path, char **target_path,
+ struct cifs_sb_info *cifs_sb)
+{
+ int rc;
+ int oplock = 0;
+ __u16 netfid;
+
+ cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
+
+ rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
+ FILE_READ_ATTRIBUTES, OPEN_REPARSE_POINT, &netfid,
+ &oplock, NULL, cifs_sb->local_nls,
+ cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
+ if (rc)
+ return rc;
+
+ rc = CIFSSMBQuerySymLink(xid, tcon, netfid, target_path,
+ cifs_sb->local_nls);
+ if (rc) {
+ CIFSSMBClose(xid, tcon, netfid);
+ return rc;
+ }
+
+ convert_delimiter(*target_path, '/');
+ CIFSSMBClose(xid, tcon, netfid);
+ cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
+ return rc;
+}
+
struct smb_version_operations smb1_operations = {
.send_cancel = send_nt_cancel,
.compare_fids = cifs_compare_fids,
@@ -927,6 +958,7 @@
.rename_pending_delete = cifs_rename_pending_delete,
.rename = CIFSSMBRename,
.create_hardlink = CIFSCreateHardLink,
+ .query_symlink = cifs_query_symlink,
.open = cifs_open_file,
.set_fid = cifs_set_fid,
.close = cifs_close_file,