vfs: Use IOP_XATTR flag for bad-inode handling

With this change, all the xattr handler based operations will produce an
-EIO result for bad inodes, and we no longer only depend on inode->i_op
to be set to bad_inode_ops.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/bad_inode.c b/fs/bad_inode.c
index 3ba385e..7bb153c 100644 (file)
--- a/fs/bad_inode.c
+++ b/fs/bad_inode.c
@@ -100,29 +100,12 @@ static int bad_inode_setattr(struct dentry *direntry, struct iattr *attrs)
        return -EIO;
 }
 
-static int bad_inode_setxattr(struct dentry *dentry, struct inode *inode,
-               const char *name, const void *value, size_t size, int flags)
-{
-       return -EIO;
-}
-
-static ssize_t bad_inode_getxattr(struct dentry *dentry, struct inode *inode,
-                       const char *name, void *buffer, size_t size)
-{
-       return -EIO;
-}
-
 static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
                        size_t buffer_size)
 {
        return -EIO;
 }
 
-static int bad_inode_removexattr(struct dentry *dentry, const char *name)
-{
-       return -EIO;
-}
-
 static const struct inode_operations bad_inode_ops =
 {
        .create         = bad_inode_create,
@@ -142,10 +125,7 @@ static const struct inode_operations bad_inode_ops =
        .permission     = bad_inode_permission,
        .getattr        = bad_inode_getattr,
        .setattr        = bad_inode_setattr,
-       .setxattr       = bad_inode_setxattr,
-       .getxattr       = bad_inode_getxattr,
        .listxattr      = bad_inode_listxattr,
-       .removexattr    = bad_inode_removexattr,
 };
 
 
@@ -175,6 +155,7 @@ void make_bad_inode(struct inode *inode)
        inode->i_atime = inode->i_mtime = inode->i_ctime =
                current_fs_time(inode->i_sb);
        inode->i_op = &bad_inode_ops;   
+       inode->i_opflags &= ~IOP_XATTR;
        inode->i_fop = &bad_file_ops;   
 }
 EXPORT_SYMBOL(make_bad_inode);

diff --git a/fs/xattr.c b/fs/xattr.c
index 38b52a3..1f5d0b4 100644 (file)
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -58,8 +58,11 @@ xattr_resolve_name(struct inode *inode, const char **name)
        const struct xattr_handler **handlers = inode->i_sb->s_xattr;
        const struct xattr_handler *handler;
 
-       if (!(inode->i_opflags & IOP_XATTR))
+       if (!(inode->i_opflags & IOP_XATTR)) {
+               if (unlikely(is_bad_inode(inode)))
+                       return ERR_PTR(-EIO);
                return ERR_PTR(-EOPNOTSUPP);
+       }
        for_each_xattr_handler(handlers, handler) {
                const char *n;
 
@@ -168,6 +171,9 @@ int __vfs_setxattr_noperm(struct dentry *dentry, const char *name,
                }
        } else if (issec) {
                const char *suffix = name + XATTR_SECURITY_PREFIX_LEN;
+
+               if (unlikely(is_bad_inode(inode)))
+                       return -EIO;
                error = security_inode_setsecurity(inode, suffix, value,
                                                   size, flags);
                if (!error)