fs: provide rcu-walk aware permission i_ops
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 0bc81cf..d3244d9 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -749,11 +749,14 @@
return err;
}
-int hostfs_permission(struct inode *ino, int desired)
+int hostfs_permission(struct inode *ino, int desired, unsigned int flags)
{
char *name;
int r = 0, w = 0, x = 0, err;
+ if (flags & IPERM_FLAG_RCU)
+ return -ECHILD;
+
if (desired & MAY_READ) r = 1;
if (desired & MAY_WRITE) w = 1;
if (desired & MAY_EXEC) x = 1;
@@ -768,7 +771,7 @@
err = access_file(name, r, w, x);
__putname(name);
if (!err)
- err = generic_permission(ino, desired, NULL);
+ err = generic_permission(ino, desired, flags, NULL);
return err;
}