fs/9p: v9fs_stat2inode should update suid/sgid bits.

Create a new helper that update the permission bits and use
that, instead of opencoding the logic.

Reported and bisected by:  M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

1 files changed, 28 insertions, 12 deletions

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 85c29733d8b..cf3dd6bc537 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -95,6 +95,32 @@ static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
 }
 
 /**
+ * p9mode2perm- convert plan9 mode bits to unix permission bits
+ * @v9ses: v9fs session information
+ * @stat: p9_wstat from which mode need to be derived
+ *
+ */
+static int p9mode2perm(struct v9fs_session_info *v9ses,
+                       struct p9_wstat *stat)
+{
+        int res;
+        int mode = stat->mode;
+
+        res = mode & S_IALLUGO;
+        if (v9fs_proto_dotu(v9ses)) {
+                if ((mode & P9_DMSETUID) == P9_DMSETUID)
+                        res |= S_ISUID;
+
+                if ((mode & P9_DMSETGID) == P9_DMSETGID)
+                        res |= S_ISGID;
+
+                if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
+                        res |= S_ISVTX;
+        }
+        return res;
+}
+
+/**
  * p9mode2unixmode- convert plan9 mode bits to unix mode bits
  * @v9ses: v9fs session information
  * @stat: p9_wstat from which mode need to be derived
@@ -107,8 +133,8 @@ static int p9mode2unixmode(struct v9fs_session_info *v9ses,
         int res;
         int mode = stat->mode;
 
-        res = mode & S_IALLUGO;
         *rdev = 0;
+        res = p9mode2perm(v9ses, stat);
 
         if ((mode & P9_DMDIR) == P9_DMDIR)
                 res |= S_IFDIR;
@@ -142,16 +168,6 @@ static int p9mode2unixmode(struct v9fs_session_info *v9ses,
         } else
                 res |= S_IFREG;
 
-        if (v9fs_proto_dotu(v9ses)) {
-                if ((mode & P9_DMSETUID) == P9_DMSETUID)
-                        res |= S_ISUID;
-
-                if ((mode & P9_DMSETGID) == P9_DMSETGID)
-                        res |= S_ISGID;
-
-                if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
-                        res |= S_ISVTX;
-        }
         return res;
 }
 
@@ -1168,7 +1184,7 @@ v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
                                 set_nlink(inode, i_nlink);
                 }
         }
-        mode = stat->mode & S_IALLUGO;
+        mode = p9mode2perm(v9ses, stat);
         mode |= inode->i_mode & ~S_IALLUGO;
         inode->i_mode = mode;
         i_size_write(inode, stat->length);