fs: provide rcu-walk aware permission i_ops

Signed-off-by: Nick Piggin <npiggin@kernel.dk>

1 files changed, 10 insertions, 4 deletions

diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index 9ea22a56cdf1..3cfb2e933644 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -870,11 +870,14 @@ out:
         return err;
 }
 
-static int reiserfs_check_acl(struct inode *inode, int mask)
+static int reiserfs_check_acl(struct inode *inode, int mask, unsigned int flags)
 {
         struct posix_acl *acl;
         int error = -EAGAIN; /* do regular unix permission checks by default */
 
+        if (flags & IPERM_FLAG_RCU)
+                return -ECHILD;
+
         acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
 
         if (acl) {
@@ -951,8 +954,10 @@ static int xattr_mount_check(struct super_block *s)
         return 0;
 }
 
-int reiserfs_permission(struct inode *inode, int mask)
+int reiserfs_permission(struct inode *inode, int mask, unsigned int flags)
 {
+        if (flags & IPERM_FLAG_RCU)
+                return -ECHILD;
         /*
          * We don't do permission checks on the internal objects.
          * Permissions are determined by the "owning" object.
@@ -965,9 +970,10 @@ int reiserfs_permission(struct inode *inode, int mask)
          * Stat data v1 doesn't support ACLs.
          */
         if (get_inode_sd_version(inode) != STAT_DATA_V1)
-                return generic_permission(inode, mask, reiserfs_check_acl);
+                return generic_permission(inode, mask, flags,
+                                        reiserfs_check_acl);
 #endif
-        return generic_permission(inode, mask, NULL);
+        return generic_permission(inode, mask, flags, NULL);
 }
 
 static int xattr_hide_revalidate(struct dentry *dentry, struct nameidata *nd)