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>
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 85c2973..cf3dd6b 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -95,6 +95,32 @@
}
/**
+ * 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 @@
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 @@
} 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 @@
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);