ocfs2: Add incompatible flag for extended attribute

This patch adds the s_incompat flag for extended attribute support. This
helps us ensure that older versions of Ocfs2 or ocfs2-tools will not be able
to mount a volume with xattr support.

Signed-off-by: Tiger Yang <tiger.yang@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index 9ec7136b3ad7..090449f9263e 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -564,6 +564,9 @@ ssize_t ocfs2_listxattr(struct dentry *dentry,
         struct ocfs2_dinode *di = NULL;
         struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
 
+        if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
+                return -EOPNOTSUPP;
+
         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
                 return ret;
 
@@ -843,6 +846,9 @@ int ocfs2_xattr_get(struct inode *inode,
                 .not_found = -ENODATA,
         };
 
+        if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
+                return -EOPNOTSUPP;
+
         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
                 ret = -ENODATA;
 
@@ -1541,6 +1547,9 @@ int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
         handle_t *handle;
         int ret;
 
+        if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
+                return 0;
+
         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
                 return 0;
 
@@ -1977,6 +1986,9 @@ int ocfs2_xattr_set(struct inode *inode,
                 .not_found = -ENODATA,
         };
 
+        if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
+                return -EOPNOTSUPP;
+
         ret = ocfs2_inode_lock(inode, &di_bh, 1);
         if (ret < 0) {
                 mlog_errno(ret);