vfs: Add IOP_XATTR inode operations flag
The IOP_XATTR inode operations flag in inode->i_opflags indicates that
the inode has xattr support. The flag is automatically set by
new_inode() on filesystems with xattr support (where sb->s_xattr is
defined), and cleared otherwise. Filesystems can explicitly clear it
for inodes that should not have xattr support.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/xattr.c b/fs/xattr.c
index bb3cbbf..38b52a3 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -53,10 +53,13 @@
* Find the xattr_handler with the matching prefix.
*/
static const struct xattr_handler *
-xattr_resolve_name(const struct xattr_handler **handlers, const char **name)
+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))
+ return ERR_PTR(-EOPNOTSUPP);
for_each_xattr_handler(handlers, handler) {
const char *n;
@@ -298,6 +301,7 @@
error = -EOPNOTSUPP;
return error;
+
}
EXPORT_SYMBOL_GPL(vfs_getxattr);
@@ -700,7 +704,7 @@
{
const struct xattr_handler *handler;
- handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name);
+ handler = xattr_resolve_name(inode, &name);
if (IS_ERR(handler))
return PTR_ERR(handler);
return handler->get(handler, dentry, inode,
@@ -755,7 +759,7 @@
if (size == 0)
value = ""; /* empty EA, do not remove */
- handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name);
+ handler = xattr_resolve_name(inode, &name);
if (IS_ERR(handler))
return PTR_ERR(handler);
return handler->set(handler, dentry, inode, name, value, size, flags);
@@ -770,7 +774,7 @@
{
const struct xattr_handler *handler;
- handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name);
+ handler = xattr_resolve_name(d_inode(dentry), &name);
if (IS_ERR(handler))
return PTR_ERR(handler);
return handler->set(handler, dentry, d_inode(dentry), name, NULL,