fs: provide rcu-walk aware permission i_ops

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

1 files changed, 6 insertions, 2 deletions

diff --git a/fs/ext2/acl.c b/fs/ext2/acl.c
index 2bcc0431bada..dd9bb3f0c8d7 100644
--- a/fs/ext2/acl.c
+++ b/fs/ext2/acl.c
@@ -232,10 +232,14 @@ ext2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
 }
 
 int
-ext2_check_acl(struct inode *inode, int mask)
+ext2_check_acl(struct inode *inode, int mask, unsigned int flags)
 {
-        struct posix_acl *acl = ext2_get_acl(inode, ACL_TYPE_ACCESS);
+        struct posix_acl *acl;
+
+        if (flags & IPERM_FLAG_RCU)
+                return -ECHILD;
 
+        acl = ext2_get_acl(inode, ACL_TYPE_ACCESS);
         if (IS_ERR(acl))
                 return PTR_ERR(acl);
         if (acl) {