[CIFS] add mode to acl conversion helper function

Acked-by: Shirish Pargaonkar <shirishp@us.ibm.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 33 insertions, 2 deletions

diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
index ec445802d903..dabbce00712b 100644
--- a/fs/cifs/cifsacl.c
+++ b/fs/cifs/cifsacl.c
@@ -138,9 +138,9 @@ static void access_flags_to_mode(__u32 ace_flags, int type, umode_t *pmode,
                                  umode_t *pbits_to_set)
 {
         /* the order of ACEs is important.  The canonical order is to begin with
-           DENY entries then follow with ALLOW, otherwise an allow entry could be
+           DENY entries followed by ALLOW, otherwise an allow entry could be
            encountered first, making the subsequent deny entry like "dead code"
-           which would be superflous since Windows stops when a match is made 
+           which would be superflous since Windows stops when a match is made
            for the operation you are trying to perform for your user */
 
         /* For deny ACEs we change the mask so that subsequent allow access
@@ -188,6 +188,37 @@ static void access_flags_to_mode(__u32 ace_flags, int type, umode_t *pmode,
         return;
 }
 
+/*
+   Generate access flags to reflect permissions mode is the existing mode.
+   This function is called for every ACE in the DACL whose SID matches
+   with either owner or group or everyone.
+*/
+
+static void mode_to_access_flags(umode_t mode, umode_t bits_to_use,
+                                __u32 *pace_flags)
+{
+        /* reset access mask */
+        *pace_flags = 0x0;
+
+        /* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */
+        mode &= bits_to_use;
+
+        /* check for R/W/X UGO since we do not know whose flags
+           is this but we have cleared all the bits sans RWX for
+           either user or group or other as per bits_to_use */
+        if (mode & S_IRUGO)
+                *pace_flags |= SET_FILE_READ_RIGHTS;
+        if (mode & S_IWUGO)
+                *pace_flags |= SET_FILE_WRITE_RIGHTS;
+        if (mode & S_IXUGO)
+                *pace_flags |= SET_FILE_EXEC_RIGHTS;
+
+#ifdef CONFIG_CIFS_DEBUG2
+        cFYI(1, ("mode: 0x%x, access flags now 0x%x", mode, *pace_flags));
+#endif
+        return;
+}
+
 
 #ifdef CONFIG_CIFS_DEBUG2
 static void dump_ace(struct cifs_ace *pace, char *end_of_acl)